1 /*
2 * Copyright (c) 2001 The Regents of the University of Michigan.
3 * All rights reserved.
4 *
5 * Kendrick Smith <kmsmith@umich.edu>
6 * Andy Adamson <kandros@umich.edu>
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
28 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 *
33 */
34
35 #include <linux/file.h>
36 #include <linux/fs.h>
37 #include <linux/slab.h>
38 #include <linux/namei.h>
39 #include <linux/swap.h>
40 #include <linux/pagemap.h>
41 #include <linux/ratelimit.h>
42 #include <linux/sunrpc/svcauth_gss.h>
43 #include <linux/sunrpc/addr.h>
44 #include <linux/jhash.h>
45 #include <linux/string_helpers.h>
46 #include <linux/fsnotify.h>
47 #include <linux/rhashtable.h>
48 #include <linux/nfs_ssc.h>
49
50 #include "xdr4.h"
51 #include "xdr4cb.h"
52 #include "vfs.h"
53 #include "current_stateid.h"
54
55 #include "netns.h"
56 #include "pnfs.h"
57 #include "filecache.h"
58 #include "trace.h"
59
60 #define NFSDDBG_FACILITY NFSDDBG_PROC
61
62 #define all_ones {{ ~0, ~0}, ~0}
63 static const stateid_t one_stateid = {
64 .si_generation = ~0,
65 .si_opaque = all_ones,
66 };
67 static const stateid_t zero_stateid = {
68 /* all fields zero */
69 };
70 static const stateid_t currentstateid = {
71 .si_generation = 1,
72 };
73 static const stateid_t close_stateid = {
74 .si_generation = 0xffffffffU,
75 };
76
77 static u64 current_sessionid = 1;
78
79 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
80 #define ONE_STATEID(stateid) (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
81 #define CURRENT_STATEID(stateid) (!memcmp((stateid), ¤tstateid, sizeof(stateid_t)))
82 #define CLOSE_STATEID(stateid) (!memcmp((stateid), &close_stateid, sizeof(stateid_t)))
83
84 /* forward declarations */
85 static bool check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner);
86 static void nfs4_free_ol_stateid(struct nfs4_stid *stid);
87 void nfsd4_end_grace(struct nfsd_net *nn);
88 static void _free_cpntf_state_locked(struct nfsd_net *nn, struct nfs4_cpntf_state *cps);
89 static void nfsd4_file_hash_remove(struct nfs4_file *fi);
90 static void deleg_reaper(struct nfsd_net *nn);
91
92 /* Locking: */
93
94 /*
95 * Currently used for the del_recall_lru and file hash table. In an
96 * effort to decrease the scope of the client_mutex, this spinlock may
97 * eventually cover more:
98 */
99 static DEFINE_SPINLOCK(state_lock);
100
101 enum nfsd4_st_mutex_lock_subclass {
102 OPEN_STATEID_MUTEX = 0,
103 LOCK_STATEID_MUTEX = 1,
104 };
105
106 /*
107 * A waitqueue for all in-progress 4.0 CLOSE operations that are waiting for
108 * the refcount on the open stateid to drop.
109 */
110 static DECLARE_WAIT_QUEUE_HEAD(close_wq);
111
112 /*
113 * A waitqueue where a writer to clients/#/ctl destroying a client can
114 * wait for cl_rpc_users to drop to 0 and then for the client to be
115 * unhashed.
116 */
117 static DECLARE_WAIT_QUEUE_HEAD(expiry_wq);
118
119 static struct kmem_cache *client_slab;
120 static struct kmem_cache *openowner_slab;
121 static struct kmem_cache *lockowner_slab;
122 static struct kmem_cache *file_slab;
123 static struct kmem_cache *stateid_slab;
124 static struct kmem_cache *deleg_slab;
125 static struct kmem_cache *odstate_slab;
126
127 static void free_session(struct nfsd4_session *);
128
129 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops;
130 static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops;
131 static const struct nfsd4_callback_ops nfsd4_cb_getattr_ops;
132
133 static struct workqueue_struct *laundry_wq;
134
nfsd4_create_laundry_wq(void)135 int nfsd4_create_laundry_wq(void)
136 {
137 int rc = 0;
138
139 laundry_wq = alloc_workqueue("%s", WQ_UNBOUND, 0, "nfsd4");
140 if (laundry_wq == NULL)
141 rc = -ENOMEM;
142 return rc;
143 }
144
nfsd4_destroy_laundry_wq(void)145 void nfsd4_destroy_laundry_wq(void)
146 {
147 destroy_workqueue(laundry_wq);
148 }
149
is_session_dead(struct nfsd4_session * ses)150 static bool is_session_dead(struct nfsd4_session *ses)
151 {
152 return ses->se_flags & NFS4_SESSION_DEAD;
153 }
154
mark_session_dead_locked(struct nfsd4_session * ses,int ref_held_by_me)155 static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me)
156 {
157 if (atomic_read(&ses->se_ref) > ref_held_by_me)
158 return nfserr_jukebox;
159 ses->se_flags |= NFS4_SESSION_DEAD;
160 return nfs_ok;
161 }
162
is_client_expired(struct nfs4_client * clp)163 static bool is_client_expired(struct nfs4_client *clp)
164 {
165 return clp->cl_time == 0;
166 }
167
nfsd4_dec_courtesy_client_count(struct nfsd_net * nn,struct nfs4_client * clp)168 static void nfsd4_dec_courtesy_client_count(struct nfsd_net *nn,
169 struct nfs4_client *clp)
170 {
171 if (clp->cl_state != NFSD4_ACTIVE)
172 atomic_add_unless(&nn->nfsd_courtesy_clients, -1, 0);
173 }
174
get_client_locked(struct nfs4_client * clp)175 static __be32 get_client_locked(struct nfs4_client *clp)
176 {
177 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
178
179 lockdep_assert_held(&nn->client_lock);
180
181 if (is_client_expired(clp))
182 return nfserr_expired;
183 atomic_inc(&clp->cl_rpc_users);
184 nfsd4_dec_courtesy_client_count(nn, clp);
185 clp->cl_state = NFSD4_ACTIVE;
186 return nfs_ok;
187 }
188
189 /* must be called under the client_lock */
190 static inline void
renew_client_locked(struct nfs4_client * clp)191 renew_client_locked(struct nfs4_client *clp)
192 {
193 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
194
195 if (is_client_expired(clp)) {
196 WARN_ON(1);
197 printk("%s: client (clientid %08x/%08x) already expired\n",
198 __func__,
199 clp->cl_clientid.cl_boot,
200 clp->cl_clientid.cl_id);
201 return;
202 }
203
204 list_move_tail(&clp->cl_lru, &nn->client_lru);
205 clp->cl_time = ktime_get_boottime_seconds();
206 nfsd4_dec_courtesy_client_count(nn, clp);
207 clp->cl_state = NFSD4_ACTIVE;
208 }
209
put_client_renew_locked(struct nfs4_client * clp)210 static void put_client_renew_locked(struct nfs4_client *clp)
211 {
212 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
213
214 lockdep_assert_held(&nn->client_lock);
215
216 if (!atomic_dec_and_test(&clp->cl_rpc_users))
217 return;
218 if (!is_client_expired(clp))
219 renew_client_locked(clp);
220 else
221 wake_up_all(&expiry_wq);
222 }
223
put_client_renew(struct nfs4_client * clp)224 static void put_client_renew(struct nfs4_client *clp)
225 {
226 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
227
228 if (!atomic_dec_and_lock(&clp->cl_rpc_users, &nn->client_lock))
229 return;
230 if (!is_client_expired(clp))
231 renew_client_locked(clp);
232 else
233 wake_up_all(&expiry_wq);
234 spin_unlock(&nn->client_lock);
235 }
236
nfsd4_get_session_locked(struct nfsd4_session * ses)237 static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
238 {
239 __be32 status;
240
241 if (is_session_dead(ses))
242 return nfserr_badsession;
243 status = get_client_locked(ses->se_client);
244 if (status)
245 return status;
246 atomic_inc(&ses->se_ref);
247 return nfs_ok;
248 }
249
nfsd4_put_session_locked(struct nfsd4_session * ses)250 static void nfsd4_put_session_locked(struct nfsd4_session *ses)
251 {
252 struct nfs4_client *clp = ses->se_client;
253 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
254
255 lockdep_assert_held(&nn->client_lock);
256
257 if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
258 free_session(ses);
259 put_client_renew_locked(clp);
260 }
261
nfsd4_put_session(struct nfsd4_session * ses)262 static void nfsd4_put_session(struct nfsd4_session *ses)
263 {
264 struct nfs4_client *clp = ses->se_client;
265 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
266
267 spin_lock(&nn->client_lock);
268 nfsd4_put_session_locked(ses);
269 spin_unlock(&nn->client_lock);
270 }
271
272 static struct nfsd4_blocked_lock *
find_blocked_lock(struct nfs4_lockowner * lo,struct knfsd_fh * fh,struct nfsd_net * nn)273 find_blocked_lock(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
274 struct nfsd_net *nn)
275 {
276 struct nfsd4_blocked_lock *cur, *found = NULL;
277
278 spin_lock(&nn->blocked_locks_lock);
279 list_for_each_entry(cur, &lo->lo_blocked, nbl_list) {
280 if (fh_match(fh, &cur->nbl_fh)) {
281 list_del_init(&cur->nbl_list);
282 WARN_ON(list_empty(&cur->nbl_lru));
283 list_del_init(&cur->nbl_lru);
284 found = cur;
285 break;
286 }
287 }
288 spin_unlock(&nn->blocked_locks_lock);
289 if (found)
290 locks_delete_block(&found->nbl_lock);
291 return found;
292 }
293
294 static struct nfsd4_blocked_lock *
find_or_allocate_block(struct nfs4_lockowner * lo,struct knfsd_fh * fh,struct nfsd_net * nn)295 find_or_allocate_block(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
296 struct nfsd_net *nn)
297 {
298 struct nfsd4_blocked_lock *nbl;
299
300 nbl = find_blocked_lock(lo, fh, nn);
301 if (!nbl) {
302 nbl = kmalloc(sizeof(*nbl), GFP_KERNEL);
303 if (nbl) {
304 INIT_LIST_HEAD(&nbl->nbl_list);
305 INIT_LIST_HEAD(&nbl->nbl_lru);
306 fh_copy_shallow(&nbl->nbl_fh, fh);
307 locks_init_lock(&nbl->nbl_lock);
308 kref_init(&nbl->nbl_kref);
309 nfsd4_init_cb(&nbl->nbl_cb, lo->lo_owner.so_client,
310 &nfsd4_cb_notify_lock_ops,
311 NFSPROC4_CLNT_CB_NOTIFY_LOCK);
312 }
313 }
314 return nbl;
315 }
316
317 static void
free_nbl(struct kref * kref)318 free_nbl(struct kref *kref)
319 {
320 struct nfsd4_blocked_lock *nbl;
321
322 nbl = container_of(kref, struct nfsd4_blocked_lock, nbl_kref);
323 locks_release_private(&nbl->nbl_lock);
324 kfree(nbl);
325 }
326
327 static void
free_blocked_lock(struct nfsd4_blocked_lock * nbl)328 free_blocked_lock(struct nfsd4_blocked_lock *nbl)
329 {
330 locks_delete_block(&nbl->nbl_lock);
331 kref_put(&nbl->nbl_kref, free_nbl);
332 }
333
334 static void
remove_blocked_locks(struct nfs4_lockowner * lo)335 remove_blocked_locks(struct nfs4_lockowner *lo)
336 {
337 struct nfs4_client *clp = lo->lo_owner.so_client;
338 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
339 struct nfsd4_blocked_lock *nbl;
340 LIST_HEAD(reaplist);
341
342 /* Dequeue all blocked locks */
343 spin_lock(&nn->blocked_locks_lock);
344 while (!list_empty(&lo->lo_blocked)) {
345 nbl = list_first_entry(&lo->lo_blocked,
346 struct nfsd4_blocked_lock,
347 nbl_list);
348 list_del_init(&nbl->nbl_list);
349 WARN_ON(list_empty(&nbl->nbl_lru));
350 list_move(&nbl->nbl_lru, &reaplist);
351 }
352 spin_unlock(&nn->blocked_locks_lock);
353
354 /* Now free them */
355 while (!list_empty(&reaplist)) {
356 nbl = list_first_entry(&reaplist, struct nfsd4_blocked_lock,
357 nbl_lru);
358 list_del_init(&nbl->nbl_lru);
359 free_blocked_lock(nbl);
360 }
361 }
362
363 static void
nfsd4_cb_notify_lock_prepare(struct nfsd4_callback * cb)364 nfsd4_cb_notify_lock_prepare(struct nfsd4_callback *cb)
365 {
366 struct nfsd4_blocked_lock *nbl = container_of(cb,
367 struct nfsd4_blocked_lock, nbl_cb);
368 locks_delete_block(&nbl->nbl_lock);
369 }
370
371 static int
nfsd4_cb_notify_lock_done(struct nfsd4_callback * cb,struct rpc_task * task)372 nfsd4_cb_notify_lock_done(struct nfsd4_callback *cb, struct rpc_task *task)
373 {
374 trace_nfsd_cb_notify_lock_done(&zero_stateid, task);
375
376 /*
377 * Since this is just an optimization, we don't try very hard if it
378 * turns out not to succeed. We'll requeue it on NFS4ERR_DELAY, and
379 * just quit trying on anything else.
380 */
381 switch (task->tk_status) {
382 case -NFS4ERR_DELAY:
383 rpc_delay(task, 1 * HZ);
384 return 0;
385 default:
386 return 1;
387 }
388 }
389
390 static void
nfsd4_cb_notify_lock_release(struct nfsd4_callback * cb)391 nfsd4_cb_notify_lock_release(struct nfsd4_callback *cb)
392 {
393 struct nfsd4_blocked_lock *nbl = container_of(cb,
394 struct nfsd4_blocked_lock, nbl_cb);
395
396 free_blocked_lock(nbl);
397 }
398
399 static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops = {
400 .prepare = nfsd4_cb_notify_lock_prepare,
401 .done = nfsd4_cb_notify_lock_done,
402 .release = nfsd4_cb_notify_lock_release,
403 };
404
405 /*
406 * We store the NONE, READ, WRITE, and BOTH bits separately in the
407 * st_{access,deny}_bmap field of the stateid, in order to track not
408 * only what share bits are currently in force, but also what
409 * combinations of share bits previous opens have used. This allows us
410 * to enforce the recommendation in
411 * https://datatracker.ietf.org/doc/html/rfc7530#section-16.19.4 that
412 * the server return an error if the client attempt to downgrade to a
413 * combination of share bits not explicable by closing some of its
414 * previous opens.
415 *
416 * This enforcement is arguably incomplete, since we don't keep
417 * track of access/deny bit combinations; so, e.g., we allow:
418 *
419 * OPEN allow read, deny write
420 * OPEN allow both, deny none
421 * DOWNGRADE allow read, deny none
422 *
423 * which we should reject.
424 *
425 * But you could also argue that our current code is already overkill,
426 * since it only exists to return NFS4ERR_INVAL on incorrect client
427 * behavior.
428 */
429 static unsigned int
bmap_to_share_mode(unsigned long bmap)430 bmap_to_share_mode(unsigned long bmap)
431 {
432 int i;
433 unsigned int access = 0;
434
435 for (i = 1; i < 4; i++) {
436 if (test_bit(i, &bmap))
437 access |= i;
438 }
439 return access;
440 }
441
442 /* set share access for a given stateid */
443 static inline void
set_access(u32 access,struct nfs4_ol_stateid * stp)444 set_access(u32 access, struct nfs4_ol_stateid *stp)
445 {
446 unsigned char mask = 1 << access;
447
448 WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
449 stp->st_access_bmap |= mask;
450 }
451
452 /* clear share access for a given stateid */
453 static inline void
clear_access(u32 access,struct nfs4_ol_stateid * stp)454 clear_access(u32 access, struct nfs4_ol_stateid *stp)
455 {
456 unsigned char mask = 1 << access;
457
458 WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
459 stp->st_access_bmap &= ~mask;
460 }
461
462 /* test whether a given stateid has access */
463 static inline bool
test_access(u32 access,struct nfs4_ol_stateid * stp)464 test_access(u32 access, struct nfs4_ol_stateid *stp)
465 {
466 unsigned char mask = 1 << access;
467
468 return (bool)(stp->st_access_bmap & mask);
469 }
470
471 /* set share deny for a given stateid */
472 static inline void
set_deny(u32 deny,struct nfs4_ol_stateid * stp)473 set_deny(u32 deny, struct nfs4_ol_stateid *stp)
474 {
475 unsigned char mask = 1 << deny;
476
477 WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
478 stp->st_deny_bmap |= mask;
479 }
480
481 /* clear share deny for a given stateid */
482 static inline void
clear_deny(u32 deny,struct nfs4_ol_stateid * stp)483 clear_deny(u32 deny, struct nfs4_ol_stateid *stp)
484 {
485 unsigned char mask = 1 << deny;
486
487 WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
488 stp->st_deny_bmap &= ~mask;
489 }
490
491 /* test whether a given stateid is denying specific access */
492 static inline bool
test_deny(u32 deny,struct nfs4_ol_stateid * stp)493 test_deny(u32 deny, struct nfs4_ol_stateid *stp)
494 {
495 unsigned char mask = 1 << deny;
496
497 return (bool)(stp->st_deny_bmap & mask);
498 }
499
nfs4_access_to_omode(u32 access)500 static int nfs4_access_to_omode(u32 access)
501 {
502 switch (access & NFS4_SHARE_ACCESS_BOTH) {
503 case NFS4_SHARE_ACCESS_READ:
504 return O_RDONLY;
505 case NFS4_SHARE_ACCESS_WRITE:
506 return O_WRONLY;
507 case NFS4_SHARE_ACCESS_BOTH:
508 return O_RDWR;
509 }
510 WARN_ON_ONCE(1);
511 return O_RDONLY;
512 }
513
514 static inline int
access_permit_read(struct nfs4_ol_stateid * stp)515 access_permit_read(struct nfs4_ol_stateid *stp)
516 {
517 return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
518 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
519 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
520 }
521
522 static inline int
access_permit_write(struct nfs4_ol_stateid * stp)523 access_permit_write(struct nfs4_ol_stateid *stp)
524 {
525 return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
526 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
527 }
528
529 static inline struct nfs4_stateowner *
nfs4_get_stateowner(struct nfs4_stateowner * sop)530 nfs4_get_stateowner(struct nfs4_stateowner *sop)
531 {
532 atomic_inc(&sop->so_count);
533 return sop;
534 }
535
536 static int
same_owner_str(struct nfs4_stateowner * sop,struct xdr_netobj * owner)537 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner)
538 {
539 return (sop->so_owner.len == owner->len) &&
540 0 == memcmp(sop->so_owner.data, owner->data, owner->len);
541 }
542
543 static struct nfs4_openowner *
find_openstateowner_str(unsigned int hashval,struct nfsd4_open * open,struct nfs4_client * clp)544 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
545 struct nfs4_client *clp)
546 {
547 struct nfs4_stateowner *so;
548
549 lockdep_assert_held(&clp->cl_lock);
550
551 list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[hashval],
552 so_strhash) {
553 if (!so->so_is_open_owner)
554 continue;
555 if (same_owner_str(so, &open->op_owner))
556 return openowner(nfs4_get_stateowner(so));
557 }
558 return NULL;
559 }
560
561 static inline u32
opaque_hashval(const void * ptr,int nbytes)562 opaque_hashval(const void *ptr, int nbytes)
563 {
564 unsigned char *cptr = (unsigned char *) ptr;
565
566 u32 x = 0;
567 while (nbytes--) {
568 x *= 37;
569 x += *cptr++;
570 }
571 return x;
572 }
573
nfsd4_free_file_rcu(struct rcu_head * rcu)574 static void nfsd4_free_file_rcu(struct rcu_head *rcu)
575 {
576 struct nfs4_file *fp = container_of(rcu, struct nfs4_file, fi_rcu);
577
578 kmem_cache_free(file_slab, fp);
579 }
580
581 void
put_nfs4_file(struct nfs4_file * fi)582 put_nfs4_file(struct nfs4_file *fi)
583 {
584 if (refcount_dec_and_test(&fi->fi_ref)) {
585 nfsd4_file_hash_remove(fi);
586 WARN_ON_ONCE(!list_empty(&fi->fi_clnt_odstate));
587 WARN_ON_ONCE(!list_empty(&fi->fi_delegations));
588 call_rcu(&fi->fi_rcu, nfsd4_free_file_rcu);
589 }
590 }
591
592 static struct nfsd_file *
find_writeable_file_locked(struct nfs4_file * f)593 find_writeable_file_locked(struct nfs4_file *f)
594 {
595 struct nfsd_file *ret;
596
597 lockdep_assert_held(&f->fi_lock);
598
599 ret = nfsd_file_get(f->fi_fds[O_WRONLY]);
600 if (!ret)
601 ret = nfsd_file_get(f->fi_fds[O_RDWR]);
602 return ret;
603 }
604
605 static struct nfsd_file *
find_writeable_file(struct nfs4_file * f)606 find_writeable_file(struct nfs4_file *f)
607 {
608 struct nfsd_file *ret;
609
610 spin_lock(&f->fi_lock);
611 ret = find_writeable_file_locked(f);
612 spin_unlock(&f->fi_lock);
613
614 return ret;
615 }
616
617 static struct nfsd_file *
find_readable_file_locked(struct nfs4_file * f)618 find_readable_file_locked(struct nfs4_file *f)
619 {
620 struct nfsd_file *ret;
621
622 lockdep_assert_held(&f->fi_lock);
623
624 ret = nfsd_file_get(f->fi_fds[O_RDONLY]);
625 if (!ret)
626 ret = nfsd_file_get(f->fi_fds[O_RDWR]);
627 return ret;
628 }
629
630 static struct nfsd_file *
find_readable_file(struct nfs4_file * f)631 find_readable_file(struct nfs4_file *f)
632 {
633 struct nfsd_file *ret;
634
635 spin_lock(&f->fi_lock);
636 ret = find_readable_file_locked(f);
637 spin_unlock(&f->fi_lock);
638
639 return ret;
640 }
641
642 static struct nfsd_file *
find_rw_file(struct nfs4_file * f)643 find_rw_file(struct nfs4_file *f)
644 {
645 struct nfsd_file *ret;
646
647 spin_lock(&f->fi_lock);
648 ret = nfsd_file_get(f->fi_fds[O_RDWR]);
649 spin_unlock(&f->fi_lock);
650
651 return ret;
652 }
653
654 struct nfsd_file *
find_any_file(struct nfs4_file * f)655 find_any_file(struct nfs4_file *f)
656 {
657 struct nfsd_file *ret;
658
659 if (!f)
660 return NULL;
661 spin_lock(&f->fi_lock);
662 ret = nfsd_file_get(f->fi_fds[O_RDWR]);
663 if (!ret) {
664 ret = nfsd_file_get(f->fi_fds[O_WRONLY]);
665 if (!ret)
666 ret = nfsd_file_get(f->fi_fds[O_RDONLY]);
667 }
668 spin_unlock(&f->fi_lock);
669 return ret;
670 }
671
find_any_file_locked(struct nfs4_file * f)672 static struct nfsd_file *find_any_file_locked(struct nfs4_file *f)
673 {
674 lockdep_assert_held(&f->fi_lock);
675
676 if (f->fi_fds[O_RDWR])
677 return f->fi_fds[O_RDWR];
678 if (f->fi_fds[O_WRONLY])
679 return f->fi_fds[O_WRONLY];
680 if (f->fi_fds[O_RDONLY])
681 return f->fi_fds[O_RDONLY];
682 return NULL;
683 }
684
685 static atomic_long_t num_delegations;
686 unsigned long max_delegations;
687
688 /*
689 * Open owner state (share locks)
690 */
691
692 /* hash tables for lock and open owners */
693 #define OWNER_HASH_BITS 8
694 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
695 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
696
ownerstr_hashval(struct xdr_netobj * ownername)697 static unsigned int ownerstr_hashval(struct xdr_netobj *ownername)
698 {
699 unsigned int ret;
700
701 ret = opaque_hashval(ownername->data, ownername->len);
702 return ret & OWNER_HASH_MASK;
703 }
704
705 static struct rhltable nfs4_file_rhltable ____cacheline_aligned_in_smp;
706
707 static const struct rhashtable_params nfs4_file_rhash_params = {
708 .key_len = sizeof_field(struct nfs4_file, fi_inode),
709 .key_offset = offsetof(struct nfs4_file, fi_inode),
710 .head_offset = offsetof(struct nfs4_file, fi_rlist),
711
712 /*
713 * Start with a single page hash table to reduce resizing churn
714 * on light workloads.
715 */
716 .min_size = 256,
717 .automatic_shrinking = true,
718 };
719
720 /*
721 * Check if courtesy clients have conflicting access and resolve it if possible
722 *
723 * access: is op_share_access if share_access is true.
724 * Check if access mode, op_share_access, would conflict with
725 * the current deny mode of the file 'fp'.
726 * access: is op_share_deny if share_access is false.
727 * Check if the deny mode, op_share_deny, would conflict with
728 * current access of the file 'fp'.
729 * stp: skip checking this entry.
730 * new_stp: normal open, not open upgrade.
731 *
732 * Function returns:
733 * false - access/deny mode conflict with normal client.
734 * true - no conflict or conflict with courtesy client(s) is resolved.
735 */
736 static bool
nfs4_resolve_deny_conflicts_locked(struct nfs4_file * fp,bool new_stp,struct nfs4_ol_stateid * stp,u32 access,bool share_access)737 nfs4_resolve_deny_conflicts_locked(struct nfs4_file *fp, bool new_stp,
738 struct nfs4_ol_stateid *stp, u32 access, bool share_access)
739 {
740 struct nfs4_ol_stateid *st;
741 bool resolvable = true;
742 unsigned char bmap;
743 struct nfsd_net *nn;
744 struct nfs4_client *clp;
745
746 lockdep_assert_held(&fp->fi_lock);
747 list_for_each_entry(st, &fp->fi_stateids, st_perfile) {
748 /* ignore lock stateid */
749 if (st->st_openstp)
750 continue;
751 if (st == stp && new_stp)
752 continue;
753 /* check file access against deny mode or vice versa */
754 bmap = share_access ? st->st_deny_bmap : st->st_access_bmap;
755 if (!(access & bmap_to_share_mode(bmap)))
756 continue;
757 clp = st->st_stid.sc_client;
758 if (try_to_expire_client(clp))
759 continue;
760 resolvable = false;
761 break;
762 }
763 if (resolvable) {
764 clp = stp->st_stid.sc_client;
765 nn = net_generic(clp->net, nfsd_net_id);
766 mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
767 }
768 return resolvable;
769 }
770
771 static void
__nfs4_file_get_access(struct nfs4_file * fp,u32 access)772 __nfs4_file_get_access(struct nfs4_file *fp, u32 access)
773 {
774 lockdep_assert_held(&fp->fi_lock);
775
776 if (access & NFS4_SHARE_ACCESS_WRITE)
777 atomic_inc(&fp->fi_access[O_WRONLY]);
778 if (access & NFS4_SHARE_ACCESS_READ)
779 atomic_inc(&fp->fi_access[O_RDONLY]);
780 }
781
782 static __be32
nfs4_file_get_access(struct nfs4_file * fp,u32 access)783 nfs4_file_get_access(struct nfs4_file *fp, u32 access)
784 {
785 lockdep_assert_held(&fp->fi_lock);
786
787 /* Does this access mode make sense? */
788 if (access & ~NFS4_SHARE_ACCESS_BOTH)
789 return nfserr_inval;
790
791 /* Does it conflict with a deny mode already set? */
792 if ((access & fp->fi_share_deny) != 0)
793 return nfserr_share_denied;
794
795 __nfs4_file_get_access(fp, access);
796 return nfs_ok;
797 }
798
nfs4_file_check_deny(struct nfs4_file * fp,u32 deny)799 static __be32 nfs4_file_check_deny(struct nfs4_file *fp, u32 deny)
800 {
801 /* Common case is that there is no deny mode. */
802 if (deny) {
803 /* Does this deny mode make sense? */
804 if (deny & ~NFS4_SHARE_DENY_BOTH)
805 return nfserr_inval;
806
807 if ((deny & NFS4_SHARE_DENY_READ) &&
808 atomic_read(&fp->fi_access[O_RDONLY]))
809 return nfserr_share_denied;
810
811 if ((deny & NFS4_SHARE_DENY_WRITE) &&
812 atomic_read(&fp->fi_access[O_WRONLY]))
813 return nfserr_share_denied;
814 }
815 return nfs_ok;
816 }
817
__nfs4_file_put_access(struct nfs4_file * fp,int oflag)818 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
819 {
820 might_lock(&fp->fi_lock);
821
822 if (atomic_dec_and_lock(&fp->fi_access[oflag], &fp->fi_lock)) {
823 struct nfsd_file *f1 = NULL;
824 struct nfsd_file *f2 = NULL;
825
826 swap(f1, fp->fi_fds[oflag]);
827 if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
828 swap(f2, fp->fi_fds[O_RDWR]);
829 spin_unlock(&fp->fi_lock);
830 if (f1)
831 nfsd_file_put(f1);
832 if (f2)
833 nfsd_file_put(f2);
834 }
835 }
836
nfs4_file_put_access(struct nfs4_file * fp,u32 access)837 static void nfs4_file_put_access(struct nfs4_file *fp, u32 access)
838 {
839 WARN_ON_ONCE(access & ~NFS4_SHARE_ACCESS_BOTH);
840
841 if (access & NFS4_SHARE_ACCESS_WRITE)
842 __nfs4_file_put_access(fp, O_WRONLY);
843 if (access & NFS4_SHARE_ACCESS_READ)
844 __nfs4_file_put_access(fp, O_RDONLY);
845 }
846
847 /*
848 * Allocate a new open/delegation state counter. This is needed for
849 * pNFS for proper return on close semantics.
850 *
851 * Note that we only allocate it for pNFS-enabled exports, otherwise
852 * all pointers to struct nfs4_clnt_odstate are always NULL.
853 */
854 static struct nfs4_clnt_odstate *
alloc_clnt_odstate(struct nfs4_client * clp)855 alloc_clnt_odstate(struct nfs4_client *clp)
856 {
857 struct nfs4_clnt_odstate *co;
858
859 co = kmem_cache_zalloc(odstate_slab, GFP_KERNEL);
860 if (co) {
861 co->co_client = clp;
862 refcount_set(&co->co_odcount, 1);
863 }
864 return co;
865 }
866
867 static void
hash_clnt_odstate_locked(struct nfs4_clnt_odstate * co)868 hash_clnt_odstate_locked(struct nfs4_clnt_odstate *co)
869 {
870 struct nfs4_file *fp = co->co_file;
871
872 lockdep_assert_held(&fp->fi_lock);
873 list_add(&co->co_perfile, &fp->fi_clnt_odstate);
874 }
875
876 static inline void
get_clnt_odstate(struct nfs4_clnt_odstate * co)877 get_clnt_odstate(struct nfs4_clnt_odstate *co)
878 {
879 if (co)
880 refcount_inc(&co->co_odcount);
881 }
882
883 static void
put_clnt_odstate(struct nfs4_clnt_odstate * co)884 put_clnt_odstate(struct nfs4_clnt_odstate *co)
885 {
886 struct nfs4_file *fp;
887
888 if (!co)
889 return;
890
891 fp = co->co_file;
892 if (refcount_dec_and_lock(&co->co_odcount, &fp->fi_lock)) {
893 list_del(&co->co_perfile);
894 spin_unlock(&fp->fi_lock);
895
896 nfsd4_return_all_file_layouts(co->co_client, fp);
897 kmem_cache_free(odstate_slab, co);
898 }
899 }
900
901 static struct nfs4_clnt_odstate *
find_or_hash_clnt_odstate(struct nfs4_file * fp,struct nfs4_clnt_odstate * new)902 find_or_hash_clnt_odstate(struct nfs4_file *fp, struct nfs4_clnt_odstate *new)
903 {
904 struct nfs4_clnt_odstate *co;
905 struct nfs4_client *cl;
906
907 if (!new)
908 return NULL;
909
910 cl = new->co_client;
911
912 spin_lock(&fp->fi_lock);
913 list_for_each_entry(co, &fp->fi_clnt_odstate, co_perfile) {
914 if (co->co_client == cl) {
915 get_clnt_odstate(co);
916 goto out;
917 }
918 }
919 co = new;
920 co->co_file = fp;
921 hash_clnt_odstate_locked(new);
922 out:
923 spin_unlock(&fp->fi_lock);
924 return co;
925 }
926
nfs4_alloc_stid(struct nfs4_client * cl,struct kmem_cache * slab,void (* sc_free)(struct nfs4_stid *))927 struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab,
928 void (*sc_free)(struct nfs4_stid *))
929 {
930 struct nfs4_stid *stid;
931 int new_id;
932
933 stid = kmem_cache_zalloc(slab, GFP_KERNEL);
934 if (!stid)
935 return NULL;
936
937 idr_preload(GFP_KERNEL);
938 spin_lock(&cl->cl_lock);
939 /* Reserving 0 for start of file in nfsdfs "states" file: */
940 new_id = idr_alloc_cyclic(&cl->cl_stateids, stid, 1, 0, GFP_NOWAIT);
941 spin_unlock(&cl->cl_lock);
942 idr_preload_end();
943 if (new_id < 0)
944 goto out_free;
945
946 stid->sc_free = sc_free;
947 stid->sc_client = cl;
948 stid->sc_stateid.si_opaque.so_id = new_id;
949 stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
950 /* Will be incremented before return to client: */
951 refcount_set(&stid->sc_count, 1);
952 spin_lock_init(&stid->sc_lock);
953 INIT_LIST_HEAD(&stid->sc_cp_list);
954
955 /*
956 * It shouldn't be a problem to reuse an opaque stateid value.
957 * I don't think it is for 4.1. But with 4.0 I worry that, for
958 * example, a stray write retransmission could be accepted by
959 * the server when it should have been rejected. Therefore,
960 * adopt a trick from the sctp code to attempt to maximize the
961 * amount of time until an id is reused, by ensuring they always
962 * "increase" (mod INT_MAX):
963 */
964 return stid;
965 out_free:
966 kmem_cache_free(slab, stid);
967 return NULL;
968 }
969
970 /*
971 * Create a unique stateid_t to represent each COPY.
972 */
nfs4_init_cp_state(struct nfsd_net * nn,copy_stateid_t * stid,unsigned char cs_type)973 static int nfs4_init_cp_state(struct nfsd_net *nn, copy_stateid_t *stid,
974 unsigned char cs_type)
975 {
976 int new_id;
977
978 stid->cs_stid.si_opaque.so_clid.cl_boot = (u32)nn->boot_time;
979 stid->cs_stid.si_opaque.so_clid.cl_id = nn->s2s_cp_cl_id;
980
981 idr_preload(GFP_KERNEL);
982 spin_lock(&nn->s2s_cp_lock);
983 new_id = idr_alloc_cyclic(&nn->s2s_cp_stateids, stid, 0, 0, GFP_NOWAIT);
984 stid->cs_stid.si_opaque.so_id = new_id;
985 stid->cs_stid.si_generation = 1;
986 spin_unlock(&nn->s2s_cp_lock);
987 idr_preload_end();
988 if (new_id < 0)
989 return 0;
990 stid->cs_type = cs_type;
991 return 1;
992 }
993
nfs4_init_copy_state(struct nfsd_net * nn,struct nfsd4_copy * copy)994 int nfs4_init_copy_state(struct nfsd_net *nn, struct nfsd4_copy *copy)
995 {
996 return nfs4_init_cp_state(nn, ©->cp_stateid, NFS4_COPY_STID);
997 }
998
nfs4_alloc_init_cpntf_state(struct nfsd_net * nn,struct nfs4_stid * p_stid)999 struct nfs4_cpntf_state *nfs4_alloc_init_cpntf_state(struct nfsd_net *nn,
1000 struct nfs4_stid *p_stid)
1001 {
1002 struct nfs4_cpntf_state *cps;
1003
1004 cps = kzalloc(sizeof(struct nfs4_cpntf_state), GFP_KERNEL);
1005 if (!cps)
1006 return NULL;
1007 cps->cpntf_time = ktime_get_boottime_seconds();
1008 refcount_set(&cps->cp_stateid.cs_count, 1);
1009 if (!nfs4_init_cp_state(nn, &cps->cp_stateid, NFS4_COPYNOTIFY_STID))
1010 goto out_free;
1011 spin_lock(&nn->s2s_cp_lock);
1012 list_add(&cps->cp_list, &p_stid->sc_cp_list);
1013 spin_unlock(&nn->s2s_cp_lock);
1014 return cps;
1015 out_free:
1016 kfree(cps);
1017 return NULL;
1018 }
1019
nfs4_free_copy_state(struct nfsd4_copy * copy)1020 void nfs4_free_copy_state(struct nfsd4_copy *copy)
1021 {
1022 struct nfsd_net *nn;
1023
1024 if (copy->cp_stateid.cs_type != NFS4_COPY_STID)
1025 return;
1026 nn = net_generic(copy->cp_clp->net, nfsd_net_id);
1027 spin_lock(&nn->s2s_cp_lock);
1028 idr_remove(&nn->s2s_cp_stateids,
1029 copy->cp_stateid.cs_stid.si_opaque.so_id);
1030 spin_unlock(&nn->s2s_cp_lock);
1031 }
1032
nfs4_free_cpntf_statelist(struct net * net,struct nfs4_stid * stid)1033 static void nfs4_free_cpntf_statelist(struct net *net, struct nfs4_stid *stid)
1034 {
1035 struct nfs4_cpntf_state *cps;
1036 struct nfsd_net *nn;
1037
1038 nn = net_generic(net, nfsd_net_id);
1039 spin_lock(&nn->s2s_cp_lock);
1040 while (!list_empty(&stid->sc_cp_list)) {
1041 cps = list_first_entry(&stid->sc_cp_list,
1042 struct nfs4_cpntf_state, cp_list);
1043 _free_cpntf_state_locked(nn, cps);
1044 }
1045 spin_unlock(&nn->s2s_cp_lock);
1046 }
1047
nfs4_alloc_open_stateid(struct nfs4_client * clp)1048 static struct nfs4_ol_stateid * nfs4_alloc_open_stateid(struct nfs4_client *clp)
1049 {
1050 struct nfs4_stid *stid;
1051
1052 stid = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_ol_stateid);
1053 if (!stid)
1054 return NULL;
1055
1056 return openlockstateid(stid);
1057 }
1058
nfs4_free_deleg(struct nfs4_stid * stid)1059 static void nfs4_free_deleg(struct nfs4_stid *stid)
1060 {
1061 struct nfs4_delegation *dp = delegstateid(stid);
1062
1063 WARN_ON_ONCE(!list_empty(&stid->sc_cp_list));
1064 WARN_ON_ONCE(!list_empty(&dp->dl_perfile));
1065 WARN_ON_ONCE(!list_empty(&dp->dl_perclnt));
1066 WARN_ON_ONCE(!list_empty(&dp->dl_recall_lru));
1067 kmem_cache_free(deleg_slab, stid);
1068 atomic_long_dec(&num_delegations);
1069 }
1070
1071 /*
1072 * When we recall a delegation, we should be careful not to hand it
1073 * out again straight away.
1074 * To ensure this we keep a pair of bloom filters ('new' and 'old')
1075 * in which the filehandles of recalled delegations are "stored".
1076 * If a filehandle appear in either filter, a delegation is blocked.
1077 * When a delegation is recalled, the filehandle is stored in the "new"
1078 * filter.
1079 * Every 30 seconds we swap the filters and clear the "new" one,
1080 * unless both are empty of course.
1081 *
1082 * Each filter is 256 bits. We hash the filehandle to 32bit and use the
1083 * low 3 bytes as hash-table indices.
1084 *
1085 * 'blocked_delegations_lock', which is always taken in block_delegations(),
1086 * is used to manage concurrent access. Testing does not need the lock
1087 * except when swapping the two filters.
1088 */
1089 static DEFINE_SPINLOCK(blocked_delegations_lock);
1090 static struct bloom_pair {
1091 int entries, old_entries;
1092 time64_t swap_time;
1093 int new; /* index into 'set' */
1094 DECLARE_BITMAP(set[2], 256);
1095 } blocked_delegations;
1096
delegation_blocked(struct knfsd_fh * fh)1097 static int delegation_blocked(struct knfsd_fh *fh)
1098 {
1099 u32 hash;
1100 struct bloom_pair *bd = &blocked_delegations;
1101
1102 if (bd->entries == 0)
1103 return 0;
1104 if (ktime_get_seconds() - bd->swap_time > 30) {
1105 spin_lock(&blocked_delegations_lock);
1106 if (ktime_get_seconds() - bd->swap_time > 30) {
1107 bd->entries -= bd->old_entries;
1108 bd->old_entries = bd->entries;
1109 memset(bd->set[bd->new], 0,
1110 sizeof(bd->set[0]));
1111 bd->new = 1-bd->new;
1112 bd->swap_time = ktime_get_seconds();
1113 }
1114 spin_unlock(&blocked_delegations_lock);
1115 }
1116 hash = jhash(&fh->fh_raw, fh->fh_size, 0);
1117 if (test_bit(hash&255, bd->set[0]) &&
1118 test_bit((hash>>8)&255, bd->set[0]) &&
1119 test_bit((hash>>16)&255, bd->set[0]))
1120 return 1;
1121
1122 if (test_bit(hash&255, bd->set[1]) &&
1123 test_bit((hash>>8)&255, bd->set[1]) &&
1124 test_bit((hash>>16)&255, bd->set[1]))
1125 return 1;
1126
1127 return 0;
1128 }
1129
block_delegations(struct knfsd_fh * fh)1130 static void block_delegations(struct knfsd_fh *fh)
1131 {
1132 u32 hash;
1133 struct bloom_pair *bd = &blocked_delegations;
1134
1135 hash = jhash(&fh->fh_raw, fh->fh_size, 0);
1136
1137 spin_lock(&blocked_delegations_lock);
1138 __set_bit(hash&255, bd->set[bd->new]);
1139 __set_bit((hash>>8)&255, bd->set[bd->new]);
1140 __set_bit((hash>>16)&255, bd->set[bd->new]);
1141 if (bd->entries == 0)
1142 bd->swap_time = ktime_get_seconds();
1143 bd->entries += 1;
1144 spin_unlock(&blocked_delegations_lock);
1145 }
1146
1147 static struct nfs4_delegation *
alloc_init_deleg(struct nfs4_client * clp,struct nfs4_file * fp,struct nfs4_clnt_odstate * odstate,u32 dl_type)1148 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_file *fp,
1149 struct nfs4_clnt_odstate *odstate, u32 dl_type)
1150 {
1151 struct nfs4_delegation *dp;
1152 struct nfs4_stid *stid;
1153 long n;
1154
1155 dprintk("NFSD alloc_init_deleg\n");
1156 n = atomic_long_inc_return(&num_delegations);
1157 if (n < 0 || n > max_delegations)
1158 goto out_dec;
1159 if (delegation_blocked(&fp->fi_fhandle))
1160 goto out_dec;
1161 stid = nfs4_alloc_stid(clp, deleg_slab, nfs4_free_deleg);
1162 if (stid == NULL)
1163 goto out_dec;
1164 dp = delegstateid(stid);
1165
1166 /*
1167 * delegation seqid's are never incremented. The 4.1 special
1168 * meaning of seqid 0 isn't meaningful, really, but let's avoid
1169 * 0 anyway just for consistency and use 1:
1170 */
1171 dp->dl_stid.sc_stateid.si_generation = 1;
1172 INIT_LIST_HEAD(&dp->dl_perfile);
1173 INIT_LIST_HEAD(&dp->dl_perclnt);
1174 INIT_LIST_HEAD(&dp->dl_recall_lru);
1175 dp->dl_clnt_odstate = odstate;
1176 get_clnt_odstate(odstate);
1177 dp->dl_type = dl_type;
1178 dp->dl_retries = 1;
1179 dp->dl_recalled = false;
1180 nfsd4_init_cb(&dp->dl_recall, dp->dl_stid.sc_client,
1181 &nfsd4_cb_recall_ops, NFSPROC4_CLNT_CB_RECALL);
1182 nfsd4_init_cb(&dp->dl_cb_fattr.ncf_getattr, dp->dl_stid.sc_client,
1183 &nfsd4_cb_getattr_ops, NFSPROC4_CLNT_CB_GETATTR);
1184 dp->dl_cb_fattr.ncf_file_modified = false;
1185 dp->dl_cb_fattr.ncf_cb_bmap[0] = FATTR4_WORD0_CHANGE | FATTR4_WORD0_SIZE;
1186 get_nfs4_file(fp);
1187 dp->dl_stid.sc_file = fp;
1188 return dp;
1189 out_dec:
1190 atomic_long_dec(&num_delegations);
1191 return NULL;
1192 }
1193
1194 void
nfs4_put_stid(struct nfs4_stid * s)1195 nfs4_put_stid(struct nfs4_stid *s)
1196 {
1197 struct nfs4_file *fp = s->sc_file;
1198 struct nfs4_client *clp = s->sc_client;
1199
1200 might_lock(&clp->cl_lock);
1201
1202 if (!refcount_dec_and_lock(&s->sc_count, &clp->cl_lock)) {
1203 wake_up_all(&close_wq);
1204 return;
1205 }
1206 idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
1207 if (s->sc_status & SC_STATUS_ADMIN_REVOKED)
1208 atomic_dec(&s->sc_client->cl_admin_revoked);
1209 nfs4_free_cpntf_statelist(clp->net, s);
1210 spin_unlock(&clp->cl_lock);
1211 s->sc_free(s);
1212 if (fp)
1213 put_nfs4_file(fp);
1214 }
1215
1216 void
nfs4_inc_and_copy_stateid(stateid_t * dst,struct nfs4_stid * stid)1217 nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid)
1218 {
1219 stateid_t *src = &stid->sc_stateid;
1220
1221 spin_lock(&stid->sc_lock);
1222 if (unlikely(++src->si_generation == 0))
1223 src->si_generation = 1;
1224 memcpy(dst, src, sizeof(*dst));
1225 spin_unlock(&stid->sc_lock);
1226 }
1227
put_deleg_file(struct nfs4_file * fp)1228 static void put_deleg_file(struct nfs4_file *fp)
1229 {
1230 struct nfsd_file *nf = NULL;
1231
1232 spin_lock(&fp->fi_lock);
1233 if (--fp->fi_delegees == 0)
1234 swap(nf, fp->fi_deleg_file);
1235 spin_unlock(&fp->fi_lock);
1236
1237 if (nf)
1238 nfsd_file_put(nf);
1239 }
1240
nfs4_unlock_deleg_lease(struct nfs4_delegation * dp)1241 static void nfs4_unlock_deleg_lease(struct nfs4_delegation *dp)
1242 {
1243 struct nfs4_file *fp = dp->dl_stid.sc_file;
1244 struct nfsd_file *nf = fp->fi_deleg_file;
1245
1246 WARN_ON_ONCE(!fp->fi_delegees);
1247
1248 kernel_setlease(nf->nf_file, F_UNLCK, NULL, (void **)&dp);
1249 put_deleg_file(fp);
1250 }
1251
destroy_unhashed_deleg(struct nfs4_delegation * dp)1252 static void destroy_unhashed_deleg(struct nfs4_delegation *dp)
1253 {
1254 put_clnt_odstate(dp->dl_clnt_odstate);
1255 nfs4_unlock_deleg_lease(dp);
1256 nfs4_put_stid(&dp->dl_stid);
1257 }
1258
1259 /**
1260 * nfs4_delegation_exists - Discover if this delegation already exists
1261 * @clp: a pointer to the nfs4_client we're granting a delegation to
1262 * @fp: a pointer to the nfs4_file we're granting a delegation on
1263 *
1264 * Return:
1265 * On success: true iff an existing delegation is found
1266 */
1267
1268 static bool
nfs4_delegation_exists(struct nfs4_client * clp,struct nfs4_file * fp)1269 nfs4_delegation_exists(struct nfs4_client *clp, struct nfs4_file *fp)
1270 {
1271 struct nfs4_delegation *searchdp = NULL;
1272 struct nfs4_client *searchclp = NULL;
1273
1274 lockdep_assert_held(&state_lock);
1275 lockdep_assert_held(&fp->fi_lock);
1276
1277 list_for_each_entry(searchdp, &fp->fi_delegations, dl_perfile) {
1278 searchclp = searchdp->dl_stid.sc_client;
1279 if (clp == searchclp) {
1280 return true;
1281 }
1282 }
1283 return false;
1284 }
1285
1286 /**
1287 * hash_delegation_locked - Add a delegation to the appropriate lists
1288 * @dp: a pointer to the nfs4_delegation we are adding.
1289 * @fp: a pointer to the nfs4_file we're granting a delegation on
1290 *
1291 * Return:
1292 * On success: NULL if the delegation was successfully hashed.
1293 *
1294 * On error: -EAGAIN if one was previously granted to this
1295 * nfs4_client for this nfs4_file. Delegation is not hashed.
1296 *
1297 */
1298
1299 static int
hash_delegation_locked(struct nfs4_delegation * dp,struct nfs4_file * fp)1300 hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
1301 {
1302 struct nfs4_client *clp = dp->dl_stid.sc_client;
1303
1304 lockdep_assert_held(&state_lock);
1305 lockdep_assert_held(&fp->fi_lock);
1306 lockdep_assert_held(&clp->cl_lock);
1307
1308 if (nfs4_delegation_exists(clp, fp))
1309 return -EAGAIN;
1310 refcount_inc(&dp->dl_stid.sc_count);
1311 dp->dl_stid.sc_type = SC_TYPE_DELEG;
1312 list_add(&dp->dl_perfile, &fp->fi_delegations);
1313 list_add(&dp->dl_perclnt, &clp->cl_delegations);
1314 return 0;
1315 }
1316
delegation_hashed(struct nfs4_delegation * dp)1317 static bool delegation_hashed(struct nfs4_delegation *dp)
1318 {
1319 return !(list_empty(&dp->dl_perfile));
1320 }
1321
1322 static bool
unhash_delegation_locked(struct nfs4_delegation * dp,unsigned short statusmask)1323 unhash_delegation_locked(struct nfs4_delegation *dp, unsigned short statusmask)
1324 {
1325 struct nfs4_file *fp = dp->dl_stid.sc_file;
1326
1327 lockdep_assert_held(&state_lock);
1328
1329 if (!delegation_hashed(dp))
1330 return false;
1331
1332 if (statusmask == SC_STATUS_REVOKED &&
1333 dp->dl_stid.sc_client->cl_minorversion == 0)
1334 statusmask = SC_STATUS_CLOSED;
1335 dp->dl_stid.sc_status |= statusmask;
1336 if (statusmask & SC_STATUS_ADMIN_REVOKED)
1337 atomic_inc(&dp->dl_stid.sc_client->cl_admin_revoked);
1338
1339 /* Ensure that deleg break won't try to requeue it */
1340 ++dp->dl_time;
1341 spin_lock(&fp->fi_lock);
1342 list_del_init(&dp->dl_perclnt);
1343 list_del_init(&dp->dl_recall_lru);
1344 list_del_init(&dp->dl_perfile);
1345 spin_unlock(&fp->fi_lock);
1346 return true;
1347 }
1348
destroy_delegation(struct nfs4_delegation * dp)1349 static void destroy_delegation(struct nfs4_delegation *dp)
1350 {
1351 bool unhashed;
1352
1353 spin_lock(&state_lock);
1354 unhashed = unhash_delegation_locked(dp, SC_STATUS_CLOSED);
1355 spin_unlock(&state_lock);
1356 if (unhashed)
1357 destroy_unhashed_deleg(dp);
1358 }
1359
revoke_delegation(struct nfs4_delegation * dp)1360 static void revoke_delegation(struct nfs4_delegation *dp)
1361 {
1362 struct nfs4_client *clp = dp->dl_stid.sc_client;
1363
1364 WARN_ON(!list_empty(&dp->dl_recall_lru));
1365
1366 trace_nfsd_stid_revoke(&dp->dl_stid);
1367
1368 if (dp->dl_stid.sc_status &
1369 (SC_STATUS_REVOKED | SC_STATUS_ADMIN_REVOKED)) {
1370 spin_lock(&clp->cl_lock);
1371 refcount_inc(&dp->dl_stid.sc_count);
1372 list_add(&dp->dl_recall_lru, &clp->cl_revoked);
1373 spin_unlock(&clp->cl_lock);
1374 }
1375 destroy_unhashed_deleg(dp);
1376 }
1377
1378 /*
1379 * SETCLIENTID state
1380 */
1381
clientid_hashval(u32 id)1382 static unsigned int clientid_hashval(u32 id)
1383 {
1384 return id & CLIENT_HASH_MASK;
1385 }
1386
clientstr_hashval(struct xdr_netobj name)1387 static unsigned int clientstr_hashval(struct xdr_netobj name)
1388 {
1389 return opaque_hashval(name.data, 8) & CLIENT_HASH_MASK;
1390 }
1391
1392 /*
1393 * A stateid that had a deny mode associated with it is being released
1394 * or downgraded. Recalculate the deny mode on the file.
1395 */
1396 static void
recalculate_deny_mode(struct nfs4_file * fp)1397 recalculate_deny_mode(struct nfs4_file *fp)
1398 {
1399 struct nfs4_ol_stateid *stp;
1400 u32 old_deny;
1401
1402 spin_lock(&fp->fi_lock);
1403 old_deny = fp->fi_share_deny;
1404 fp->fi_share_deny = 0;
1405 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1406 fp->fi_share_deny |= bmap_to_share_mode(stp->st_deny_bmap);
1407 if (fp->fi_share_deny == old_deny)
1408 break;
1409 }
1410 spin_unlock(&fp->fi_lock);
1411 }
1412
1413 static void
reset_union_bmap_deny(u32 deny,struct nfs4_ol_stateid * stp)1414 reset_union_bmap_deny(u32 deny, struct nfs4_ol_stateid *stp)
1415 {
1416 int i;
1417 bool change = false;
1418
1419 for (i = 1; i < 4; i++) {
1420 if ((i & deny) != i) {
1421 change = true;
1422 clear_deny(i, stp);
1423 }
1424 }
1425
1426 /* Recalculate per-file deny mode if there was a change */
1427 if (change)
1428 recalculate_deny_mode(stp->st_stid.sc_file);
1429 }
1430
1431 /* release all access and file references for a given stateid */
1432 static void
release_all_access(struct nfs4_ol_stateid * stp)1433 release_all_access(struct nfs4_ol_stateid *stp)
1434 {
1435 int i;
1436 struct nfs4_file *fp = stp->st_stid.sc_file;
1437
1438 if (fp && stp->st_deny_bmap != 0)
1439 recalculate_deny_mode(fp);
1440
1441 for (i = 1; i < 4; i++) {
1442 if (test_access(i, stp))
1443 nfs4_file_put_access(stp->st_stid.sc_file, i);
1444 clear_access(i, stp);
1445 }
1446 }
1447
nfs4_free_stateowner(struct nfs4_stateowner * sop)1448 static inline void nfs4_free_stateowner(struct nfs4_stateowner *sop)
1449 {
1450 kfree(sop->so_owner.data);
1451 sop->so_ops->so_free(sop);
1452 }
1453
nfs4_put_stateowner(struct nfs4_stateowner * sop)1454 static void nfs4_put_stateowner(struct nfs4_stateowner *sop)
1455 {
1456 struct nfs4_client *clp = sop->so_client;
1457
1458 might_lock(&clp->cl_lock);
1459
1460 if (!atomic_dec_and_lock(&sop->so_count, &clp->cl_lock))
1461 return;
1462 sop->so_ops->so_unhash(sop);
1463 spin_unlock(&clp->cl_lock);
1464 nfs4_free_stateowner(sop);
1465 }
1466
1467 static bool
nfs4_ol_stateid_unhashed(const struct nfs4_ol_stateid * stp)1468 nfs4_ol_stateid_unhashed(const struct nfs4_ol_stateid *stp)
1469 {
1470 return list_empty(&stp->st_perfile);
1471 }
1472
unhash_ol_stateid(struct nfs4_ol_stateid * stp)1473 static bool unhash_ol_stateid(struct nfs4_ol_stateid *stp)
1474 {
1475 struct nfs4_file *fp = stp->st_stid.sc_file;
1476
1477 lockdep_assert_held(&stp->st_stateowner->so_client->cl_lock);
1478
1479 if (list_empty(&stp->st_perfile))
1480 return false;
1481
1482 spin_lock(&fp->fi_lock);
1483 list_del_init(&stp->st_perfile);
1484 spin_unlock(&fp->fi_lock);
1485 list_del(&stp->st_perstateowner);
1486 return true;
1487 }
1488
nfs4_free_ol_stateid(struct nfs4_stid * stid)1489 static void nfs4_free_ol_stateid(struct nfs4_stid *stid)
1490 {
1491 struct nfs4_ol_stateid *stp = openlockstateid(stid);
1492
1493 put_clnt_odstate(stp->st_clnt_odstate);
1494 release_all_access(stp);
1495 if (stp->st_stateowner)
1496 nfs4_put_stateowner(stp->st_stateowner);
1497 WARN_ON(!list_empty(&stid->sc_cp_list));
1498 kmem_cache_free(stateid_slab, stid);
1499 }
1500
nfs4_free_lock_stateid(struct nfs4_stid * stid)1501 static void nfs4_free_lock_stateid(struct nfs4_stid *stid)
1502 {
1503 struct nfs4_ol_stateid *stp = openlockstateid(stid);
1504 struct nfs4_lockowner *lo = lockowner(stp->st_stateowner);
1505 struct nfsd_file *nf;
1506
1507 nf = find_any_file(stp->st_stid.sc_file);
1508 if (nf) {
1509 get_file(nf->nf_file);
1510 filp_close(nf->nf_file, (fl_owner_t)lo);
1511 nfsd_file_put(nf);
1512 }
1513 nfs4_free_ol_stateid(stid);
1514 }
1515
1516 /*
1517 * Put the persistent reference to an already unhashed generic stateid, while
1518 * holding the cl_lock. If it's the last reference, then put it onto the
1519 * reaplist for later destruction.
1520 */
put_ol_stateid_locked(struct nfs4_ol_stateid * stp,struct list_head * reaplist)1521 static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp,
1522 struct list_head *reaplist)
1523 {
1524 struct nfs4_stid *s = &stp->st_stid;
1525 struct nfs4_client *clp = s->sc_client;
1526
1527 lockdep_assert_held(&clp->cl_lock);
1528
1529 WARN_ON_ONCE(!list_empty(&stp->st_locks));
1530
1531 if (!refcount_dec_and_test(&s->sc_count)) {
1532 wake_up_all(&close_wq);
1533 return;
1534 }
1535
1536 idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
1537 if (s->sc_status & SC_STATUS_ADMIN_REVOKED)
1538 atomic_dec(&s->sc_client->cl_admin_revoked);
1539 list_add(&stp->st_locks, reaplist);
1540 }
1541
unhash_lock_stateid(struct nfs4_ol_stateid * stp)1542 static bool unhash_lock_stateid(struct nfs4_ol_stateid *stp)
1543 {
1544 lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1545
1546 if (!unhash_ol_stateid(stp))
1547 return false;
1548 list_del_init(&stp->st_locks);
1549 stp->st_stid.sc_status |= SC_STATUS_CLOSED;
1550 return true;
1551 }
1552
release_lock_stateid(struct nfs4_ol_stateid * stp)1553 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
1554 {
1555 struct nfs4_client *clp = stp->st_stid.sc_client;
1556 bool unhashed;
1557
1558 spin_lock(&clp->cl_lock);
1559 unhashed = unhash_lock_stateid(stp);
1560 spin_unlock(&clp->cl_lock);
1561 if (unhashed)
1562 nfs4_put_stid(&stp->st_stid);
1563 }
1564
unhash_lockowner_locked(struct nfs4_lockowner * lo)1565 static void unhash_lockowner_locked(struct nfs4_lockowner *lo)
1566 {
1567 struct nfs4_client *clp = lo->lo_owner.so_client;
1568
1569 lockdep_assert_held(&clp->cl_lock);
1570
1571 list_del_init(&lo->lo_owner.so_strhash);
1572 }
1573
1574 /*
1575 * Free a list of generic stateids that were collected earlier after being
1576 * fully unhashed.
1577 */
1578 static void
free_ol_stateid_reaplist(struct list_head * reaplist)1579 free_ol_stateid_reaplist(struct list_head *reaplist)
1580 {
1581 struct nfs4_ol_stateid *stp;
1582 struct nfs4_file *fp;
1583
1584 might_sleep();
1585
1586 while (!list_empty(reaplist)) {
1587 stp = list_first_entry(reaplist, struct nfs4_ol_stateid,
1588 st_locks);
1589 list_del(&stp->st_locks);
1590 fp = stp->st_stid.sc_file;
1591 stp->st_stid.sc_free(&stp->st_stid);
1592 if (fp)
1593 put_nfs4_file(fp);
1594 }
1595 }
1596
release_open_stateid_locks(struct nfs4_ol_stateid * open_stp,struct list_head * reaplist)1597 static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp,
1598 struct list_head *reaplist)
1599 {
1600 struct nfs4_ol_stateid *stp;
1601
1602 lockdep_assert_held(&open_stp->st_stid.sc_client->cl_lock);
1603
1604 while (!list_empty(&open_stp->st_locks)) {
1605 stp = list_entry(open_stp->st_locks.next,
1606 struct nfs4_ol_stateid, st_locks);
1607 unhash_lock_stateid(stp);
1608 put_ol_stateid_locked(stp, reaplist);
1609 }
1610 }
1611
unhash_open_stateid(struct nfs4_ol_stateid * stp,struct list_head * reaplist)1612 static bool unhash_open_stateid(struct nfs4_ol_stateid *stp,
1613 struct list_head *reaplist)
1614 {
1615 lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1616
1617 if (!unhash_ol_stateid(stp))
1618 return false;
1619 release_open_stateid_locks(stp, reaplist);
1620 return true;
1621 }
1622
release_open_stateid(struct nfs4_ol_stateid * stp)1623 static void release_open_stateid(struct nfs4_ol_stateid *stp)
1624 {
1625 LIST_HEAD(reaplist);
1626
1627 spin_lock(&stp->st_stid.sc_client->cl_lock);
1628 stp->st_stid.sc_status |= SC_STATUS_CLOSED;
1629 if (unhash_open_stateid(stp, &reaplist))
1630 put_ol_stateid_locked(stp, &reaplist);
1631 spin_unlock(&stp->st_stid.sc_client->cl_lock);
1632 free_ol_stateid_reaplist(&reaplist);
1633 }
1634
unhash_openowner_locked(struct nfs4_openowner * oo)1635 static void unhash_openowner_locked(struct nfs4_openowner *oo)
1636 {
1637 struct nfs4_client *clp = oo->oo_owner.so_client;
1638
1639 lockdep_assert_held(&clp->cl_lock);
1640
1641 list_del_init(&oo->oo_owner.so_strhash);
1642 list_del_init(&oo->oo_perclient);
1643 }
1644
release_last_closed_stateid(struct nfs4_openowner * oo)1645 static void release_last_closed_stateid(struct nfs4_openowner *oo)
1646 {
1647 struct nfsd_net *nn = net_generic(oo->oo_owner.so_client->net,
1648 nfsd_net_id);
1649 struct nfs4_ol_stateid *s;
1650
1651 spin_lock(&nn->client_lock);
1652 s = oo->oo_last_closed_stid;
1653 if (s) {
1654 list_del_init(&oo->oo_close_lru);
1655 oo->oo_last_closed_stid = NULL;
1656 }
1657 spin_unlock(&nn->client_lock);
1658 if (s)
1659 nfs4_put_stid(&s->st_stid);
1660 }
1661
release_openowner(struct nfs4_openowner * oo)1662 static void release_openowner(struct nfs4_openowner *oo)
1663 {
1664 struct nfs4_ol_stateid *stp;
1665 struct nfs4_client *clp = oo->oo_owner.so_client;
1666 struct list_head reaplist;
1667
1668 INIT_LIST_HEAD(&reaplist);
1669
1670 spin_lock(&clp->cl_lock);
1671 unhash_openowner_locked(oo);
1672 while (!list_empty(&oo->oo_owner.so_stateids)) {
1673 stp = list_first_entry(&oo->oo_owner.so_stateids,
1674 struct nfs4_ol_stateid, st_perstateowner);
1675 if (unhash_open_stateid(stp, &reaplist))
1676 put_ol_stateid_locked(stp, &reaplist);
1677 }
1678 spin_unlock(&clp->cl_lock);
1679 free_ol_stateid_reaplist(&reaplist);
1680 release_last_closed_stateid(oo);
1681 nfs4_put_stateowner(&oo->oo_owner);
1682 }
1683
find_one_sb_stid(struct nfs4_client * clp,struct super_block * sb,unsigned int sc_types)1684 static struct nfs4_stid *find_one_sb_stid(struct nfs4_client *clp,
1685 struct super_block *sb,
1686 unsigned int sc_types)
1687 {
1688 unsigned long id, tmp;
1689 struct nfs4_stid *stid;
1690
1691 spin_lock(&clp->cl_lock);
1692 idr_for_each_entry_ul(&clp->cl_stateids, stid, tmp, id)
1693 if ((stid->sc_type & sc_types) &&
1694 stid->sc_status == 0 &&
1695 stid->sc_file->fi_inode->i_sb == sb) {
1696 refcount_inc(&stid->sc_count);
1697 break;
1698 }
1699 spin_unlock(&clp->cl_lock);
1700 return stid;
1701 }
1702
1703 /**
1704 * nfsd4_revoke_states - revoke all nfsv4 states associated with given filesystem
1705 * @net: used to identify instance of nfsd (there is one per net namespace)
1706 * @sb: super_block used to identify target filesystem
1707 *
1708 * All nfs4 states (open, lock, delegation, layout) held by the server instance
1709 * and associated with a file on the given filesystem will be revoked resulting
1710 * in any files being closed and so all references from nfsd to the filesystem
1711 * being released. Thus nfsd will no longer prevent the filesystem from being
1712 * unmounted.
1713 *
1714 * The clients which own the states will subsequently being notified that the
1715 * states have been "admin-revoked".
1716 */
nfsd4_revoke_states(struct net * net,struct super_block * sb)1717 void nfsd4_revoke_states(struct net *net, struct super_block *sb)
1718 {
1719 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1720 unsigned int idhashval;
1721 unsigned int sc_types;
1722
1723 sc_types = SC_TYPE_OPEN | SC_TYPE_LOCK | SC_TYPE_DELEG | SC_TYPE_LAYOUT;
1724
1725 spin_lock(&nn->client_lock);
1726 for (idhashval = 0; idhashval < CLIENT_HASH_MASK; idhashval++) {
1727 struct list_head *head = &nn->conf_id_hashtbl[idhashval];
1728 struct nfs4_client *clp;
1729 retry:
1730 list_for_each_entry(clp, head, cl_idhash) {
1731 struct nfs4_stid *stid = find_one_sb_stid(clp, sb,
1732 sc_types);
1733 if (stid) {
1734 struct nfs4_ol_stateid *stp;
1735 struct nfs4_delegation *dp;
1736 struct nfs4_layout_stateid *ls;
1737
1738 spin_unlock(&nn->client_lock);
1739 switch (stid->sc_type) {
1740 case SC_TYPE_OPEN:
1741 stp = openlockstateid(stid);
1742 mutex_lock_nested(&stp->st_mutex,
1743 OPEN_STATEID_MUTEX);
1744
1745 spin_lock(&clp->cl_lock);
1746 if (stid->sc_status == 0) {
1747 stid->sc_status |=
1748 SC_STATUS_ADMIN_REVOKED;
1749 atomic_inc(&clp->cl_admin_revoked);
1750 spin_unlock(&clp->cl_lock);
1751 release_all_access(stp);
1752 } else
1753 spin_unlock(&clp->cl_lock);
1754 mutex_unlock(&stp->st_mutex);
1755 break;
1756 case SC_TYPE_LOCK:
1757 stp = openlockstateid(stid);
1758 mutex_lock_nested(&stp->st_mutex,
1759 LOCK_STATEID_MUTEX);
1760 spin_lock(&clp->cl_lock);
1761 if (stid->sc_status == 0) {
1762 struct nfs4_lockowner *lo =
1763 lockowner(stp->st_stateowner);
1764 struct nfsd_file *nf;
1765
1766 stid->sc_status |=
1767 SC_STATUS_ADMIN_REVOKED;
1768 atomic_inc(&clp->cl_admin_revoked);
1769 spin_unlock(&clp->cl_lock);
1770 nf = find_any_file(stp->st_stid.sc_file);
1771 if (nf) {
1772 get_file(nf->nf_file);
1773 filp_close(nf->nf_file,
1774 (fl_owner_t)lo);
1775 nfsd_file_put(nf);
1776 }
1777 release_all_access(stp);
1778 } else
1779 spin_unlock(&clp->cl_lock);
1780 mutex_unlock(&stp->st_mutex);
1781 break;
1782 case SC_TYPE_DELEG:
1783 dp = delegstateid(stid);
1784 spin_lock(&state_lock);
1785 if (!unhash_delegation_locked(
1786 dp, SC_STATUS_ADMIN_REVOKED))
1787 dp = NULL;
1788 spin_unlock(&state_lock);
1789 if (dp)
1790 revoke_delegation(dp);
1791 break;
1792 case SC_TYPE_LAYOUT:
1793 ls = layoutstateid(stid);
1794 nfsd4_close_layout(ls);
1795 break;
1796 }
1797 nfs4_put_stid(stid);
1798 spin_lock(&nn->client_lock);
1799 if (clp->cl_minorversion == 0)
1800 /* Allow cleanup after a lease period.
1801 * store_release ensures cleanup will
1802 * see any newly revoked states if it
1803 * sees the time updated.
1804 */
1805 nn->nfs40_last_revoke =
1806 ktime_get_boottime_seconds();
1807 goto retry;
1808 }
1809 }
1810 }
1811 spin_unlock(&nn->client_lock);
1812 }
1813
1814 static inline int
hash_sessionid(struct nfs4_sessionid * sessionid)1815 hash_sessionid(struct nfs4_sessionid *sessionid)
1816 {
1817 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
1818
1819 return sid->sequence % SESSION_HASH_SIZE;
1820 }
1821
1822 #ifdef CONFIG_SUNRPC_DEBUG
1823 static inline void
dump_sessionid(const char * fn,struct nfs4_sessionid * sessionid)1824 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1825 {
1826 u32 *ptr = (u32 *)(&sessionid->data[0]);
1827 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
1828 }
1829 #else
1830 static inline void
dump_sessionid(const char * fn,struct nfs4_sessionid * sessionid)1831 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1832 {
1833 }
1834 #endif
1835
1836 /*
1837 * Bump the seqid on cstate->replay_owner, and clear replay_owner if it
1838 * won't be used for replay.
1839 */
nfsd4_bump_seqid(struct nfsd4_compound_state * cstate,__be32 nfserr)1840 void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
1841 {
1842 struct nfs4_stateowner *so = cstate->replay_owner;
1843
1844 if (nfserr == nfserr_replay_me)
1845 return;
1846
1847 if (!seqid_mutating_err(ntohl(nfserr))) {
1848 nfsd4_cstate_clear_replay(cstate);
1849 return;
1850 }
1851 if (!so)
1852 return;
1853 if (so->so_is_open_owner)
1854 release_last_closed_stateid(openowner(so));
1855 so->so_seqid++;
1856 return;
1857 }
1858
1859 static void
gen_sessionid(struct nfsd4_session * ses)1860 gen_sessionid(struct nfsd4_session *ses)
1861 {
1862 struct nfs4_client *clp = ses->se_client;
1863 struct nfsd4_sessionid *sid;
1864
1865 sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
1866 sid->clientid = clp->cl_clientid;
1867 sid->sequence = current_sessionid++;
1868 sid->reserved = 0;
1869 }
1870
1871 /*
1872 * The protocol defines ca_maxresponssize_cached to include the size of
1873 * the rpc header, but all we need to cache is the data starting after
1874 * the end of the initial SEQUENCE operation--the rest we regenerate
1875 * each time. Therefore we can advertise a ca_maxresponssize_cached
1876 * value that is the number of bytes in our cache plus a few additional
1877 * bytes. In order to stay on the safe side, and not promise more than
1878 * we can cache, those additional bytes must be the minimum possible: 24
1879 * bytes of rpc header (xid through accept state, with AUTH_NULL
1880 * verifier), 12 for the compound header (with zero-length tag), and 44
1881 * for the SEQUENCE op response:
1882 */
1883 #define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
1884
1885 static void
free_session_slots(struct nfsd4_session * ses)1886 free_session_slots(struct nfsd4_session *ses)
1887 {
1888 int i;
1889
1890 for (i = 0; i < ses->se_fchannel.maxreqs; i++) {
1891 free_svc_cred(&ses->se_slots[i]->sl_cred);
1892 kfree(ses->se_slots[i]);
1893 }
1894 }
1895
1896 /*
1897 * We don't actually need to cache the rpc and session headers, so we
1898 * can allocate a little less for each slot:
1899 */
slot_bytes(struct nfsd4_channel_attrs * ca)1900 static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca)
1901 {
1902 u32 size;
1903
1904 if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ)
1905 size = 0;
1906 else
1907 size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
1908 return size + sizeof(struct nfsd4_slot);
1909 }
1910
1911 /*
1912 * XXX: If we run out of reserved DRC memory we could (up to a point)
1913 * re-negotiate active sessions and reduce their slot usage to make
1914 * room for new connections. For now we just fail the create session.
1915 */
nfsd4_get_drc_mem(struct nfsd4_channel_attrs * ca,struct nfsd_net * nn)1916 static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
1917 {
1918 u32 slotsize = slot_bytes(ca);
1919 u32 num = ca->maxreqs;
1920 unsigned long avail, total_avail;
1921 unsigned int scale_factor;
1922
1923 spin_lock(&nfsd_drc_lock);
1924 if (nfsd_drc_max_mem > nfsd_drc_mem_used)
1925 total_avail = nfsd_drc_max_mem - nfsd_drc_mem_used;
1926 else
1927 /* We have handed out more space than we chose in
1928 * set_max_drc() to allow. That isn't really a
1929 * problem as long as that doesn't make us think we
1930 * have lots more due to integer overflow.
1931 */
1932 total_avail = 0;
1933 avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION, total_avail);
1934 /*
1935 * Never use more than a fraction of the remaining memory,
1936 * unless it's the only way to give this client a slot.
1937 * The chosen fraction is either 1/8 or 1/number of threads,
1938 * whichever is smaller. This ensures there are adequate
1939 * slots to support multiple clients per thread.
1940 * Give the client one slot even if that would require
1941 * over-allocation--it is better than failure.
1942 */
1943 scale_factor = max_t(unsigned int, 8, nn->nfsd_serv->sv_nrthreads);
1944
1945 avail = clamp_t(unsigned long, avail, slotsize,
1946 total_avail/scale_factor);
1947 num = min_t(int, num, avail / slotsize);
1948 num = max_t(int, num, 1);
1949 nfsd_drc_mem_used += num * slotsize;
1950 spin_unlock(&nfsd_drc_lock);
1951
1952 return num;
1953 }
1954
nfsd4_put_drc_mem(struct nfsd4_channel_attrs * ca)1955 static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca)
1956 {
1957 int slotsize = slot_bytes(ca);
1958
1959 spin_lock(&nfsd_drc_lock);
1960 nfsd_drc_mem_used -= slotsize * ca->maxreqs;
1961 spin_unlock(&nfsd_drc_lock);
1962 }
1963
alloc_session(struct nfsd4_channel_attrs * fattrs,struct nfsd4_channel_attrs * battrs)1964 static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs,
1965 struct nfsd4_channel_attrs *battrs)
1966 {
1967 int numslots = fattrs->maxreqs;
1968 int slotsize = slot_bytes(fattrs);
1969 struct nfsd4_session *new;
1970 int i;
1971
1972 BUILD_BUG_ON(struct_size(new, se_slots, NFSD_MAX_SLOTS_PER_SESSION)
1973 > PAGE_SIZE);
1974
1975 new = kzalloc(struct_size(new, se_slots, numslots), GFP_KERNEL);
1976 if (!new)
1977 return NULL;
1978 /* allocate each struct nfsd4_slot and data cache in one piece */
1979 for (i = 0; i < numslots; i++) {
1980 new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL);
1981 if (!new->se_slots[i])
1982 goto out_free;
1983 }
1984
1985 memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs));
1986 memcpy(&new->se_bchannel, battrs, sizeof(struct nfsd4_channel_attrs));
1987
1988 return new;
1989 out_free:
1990 while (i--)
1991 kfree(new->se_slots[i]);
1992 kfree(new);
1993 return NULL;
1994 }
1995
free_conn(struct nfsd4_conn * c)1996 static void free_conn(struct nfsd4_conn *c)
1997 {
1998 svc_xprt_put(c->cn_xprt);
1999 kfree(c);
2000 }
2001
nfsd4_conn_lost(struct svc_xpt_user * u)2002 static void nfsd4_conn_lost(struct svc_xpt_user *u)
2003 {
2004 struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
2005 struct nfs4_client *clp = c->cn_session->se_client;
2006
2007 trace_nfsd_cb_lost(clp);
2008
2009 spin_lock(&clp->cl_lock);
2010 if (!list_empty(&c->cn_persession)) {
2011 list_del(&c->cn_persession);
2012 free_conn(c);
2013 }
2014 nfsd4_probe_callback(clp);
2015 spin_unlock(&clp->cl_lock);
2016 }
2017
alloc_conn(struct svc_rqst * rqstp,u32 flags)2018 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
2019 {
2020 struct nfsd4_conn *conn;
2021
2022 conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
2023 if (!conn)
2024 return NULL;
2025 svc_xprt_get(rqstp->rq_xprt);
2026 conn->cn_xprt = rqstp->rq_xprt;
2027 conn->cn_flags = flags;
2028 INIT_LIST_HEAD(&conn->cn_xpt_user.list);
2029 return conn;
2030 }
2031
__nfsd4_hash_conn(struct nfsd4_conn * conn,struct nfsd4_session * ses)2032 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
2033 {
2034 conn->cn_session = ses;
2035 list_add(&conn->cn_persession, &ses->se_conns);
2036 }
2037
nfsd4_hash_conn(struct nfsd4_conn * conn,struct nfsd4_session * ses)2038 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
2039 {
2040 struct nfs4_client *clp = ses->se_client;
2041
2042 spin_lock(&clp->cl_lock);
2043 __nfsd4_hash_conn(conn, ses);
2044 spin_unlock(&clp->cl_lock);
2045 }
2046
nfsd4_register_conn(struct nfsd4_conn * conn)2047 static int nfsd4_register_conn(struct nfsd4_conn *conn)
2048 {
2049 conn->cn_xpt_user.callback = nfsd4_conn_lost;
2050 return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
2051 }
2052
nfsd4_init_conn(struct svc_rqst * rqstp,struct nfsd4_conn * conn,struct nfsd4_session * ses)2053 static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
2054 {
2055 int ret;
2056
2057 nfsd4_hash_conn(conn, ses);
2058 ret = nfsd4_register_conn(conn);
2059 if (ret)
2060 /* oops; xprt is already down: */
2061 nfsd4_conn_lost(&conn->cn_xpt_user);
2062 /* We may have gained or lost a callback channel: */
2063 nfsd4_probe_callback_sync(ses->se_client);
2064 }
2065
alloc_conn_from_crses(struct svc_rqst * rqstp,struct nfsd4_create_session * cses)2066 static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
2067 {
2068 u32 dir = NFS4_CDFC4_FORE;
2069
2070 if (cses->flags & SESSION4_BACK_CHAN)
2071 dir |= NFS4_CDFC4_BACK;
2072 return alloc_conn(rqstp, dir);
2073 }
2074
2075 /* must be called under client_lock */
nfsd4_del_conns(struct nfsd4_session * s)2076 static void nfsd4_del_conns(struct nfsd4_session *s)
2077 {
2078 struct nfs4_client *clp = s->se_client;
2079 struct nfsd4_conn *c;
2080
2081 spin_lock(&clp->cl_lock);
2082 while (!list_empty(&s->se_conns)) {
2083 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
2084 list_del_init(&c->cn_persession);
2085 spin_unlock(&clp->cl_lock);
2086
2087 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
2088 free_conn(c);
2089
2090 spin_lock(&clp->cl_lock);
2091 }
2092 spin_unlock(&clp->cl_lock);
2093 }
2094
__free_session(struct nfsd4_session * ses)2095 static void __free_session(struct nfsd4_session *ses)
2096 {
2097 free_session_slots(ses);
2098 kfree(ses);
2099 }
2100
free_session(struct nfsd4_session * ses)2101 static void free_session(struct nfsd4_session *ses)
2102 {
2103 nfsd4_del_conns(ses);
2104 nfsd4_put_drc_mem(&ses->se_fchannel);
2105 __free_session(ses);
2106 }
2107
init_session(struct svc_rqst * rqstp,struct nfsd4_session * new,struct nfs4_client * clp,struct nfsd4_create_session * cses)2108 static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
2109 {
2110 int idx;
2111 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2112
2113 new->se_client = clp;
2114 gen_sessionid(new);
2115
2116 INIT_LIST_HEAD(&new->se_conns);
2117
2118 new->se_cb_seq_nr = 1;
2119 new->se_flags = cses->flags;
2120 new->se_cb_prog = cses->callback_prog;
2121 new->se_cb_sec = cses->cb_sec;
2122 atomic_set(&new->se_ref, 0);
2123 idx = hash_sessionid(&new->se_sessionid);
2124 list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
2125 spin_lock(&clp->cl_lock);
2126 list_add(&new->se_perclnt, &clp->cl_sessions);
2127 spin_unlock(&clp->cl_lock);
2128
2129 {
2130 struct sockaddr *sa = svc_addr(rqstp);
2131 /*
2132 * This is a little silly; with sessions there's no real
2133 * use for the callback address. Use the peer address
2134 * as a reasonable default for now, but consider fixing
2135 * the rpc client not to require an address in the
2136 * future:
2137 */
2138 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
2139 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
2140 }
2141 }
2142
2143 /* caller must hold client_lock */
2144 static struct nfsd4_session *
__find_in_sessionid_hashtbl(struct nfs4_sessionid * sessionid,struct net * net)2145 __find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
2146 {
2147 struct nfsd4_session *elem;
2148 int idx;
2149 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2150
2151 lockdep_assert_held(&nn->client_lock);
2152
2153 dump_sessionid(__func__, sessionid);
2154 idx = hash_sessionid(sessionid);
2155 /* Search in the appropriate list */
2156 list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
2157 if (!memcmp(elem->se_sessionid.data, sessionid->data,
2158 NFS4_MAX_SESSIONID_LEN)) {
2159 return elem;
2160 }
2161 }
2162
2163 dprintk("%s: session not found\n", __func__);
2164 return NULL;
2165 }
2166
2167 static struct nfsd4_session *
find_in_sessionid_hashtbl(struct nfs4_sessionid * sessionid,struct net * net,__be32 * ret)2168 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net,
2169 __be32 *ret)
2170 {
2171 struct nfsd4_session *session;
2172 __be32 status = nfserr_badsession;
2173
2174 session = __find_in_sessionid_hashtbl(sessionid, net);
2175 if (!session)
2176 goto out;
2177 status = nfsd4_get_session_locked(session);
2178 if (status)
2179 session = NULL;
2180 out:
2181 *ret = status;
2182 return session;
2183 }
2184
2185 /* caller must hold client_lock */
2186 static void
unhash_session(struct nfsd4_session * ses)2187 unhash_session(struct nfsd4_session *ses)
2188 {
2189 struct nfs4_client *clp = ses->se_client;
2190 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2191
2192 lockdep_assert_held(&nn->client_lock);
2193
2194 list_del(&ses->se_hash);
2195 spin_lock(&ses->se_client->cl_lock);
2196 list_del(&ses->se_perclnt);
2197 spin_unlock(&ses->se_client->cl_lock);
2198 }
2199
2200 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
2201 static int
STALE_CLIENTID(clientid_t * clid,struct nfsd_net * nn)2202 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
2203 {
2204 /*
2205 * We're assuming the clid was not given out from a boot
2206 * precisely 2^32 (about 136 years) before this one. That seems
2207 * a safe assumption:
2208 */
2209 if (clid->cl_boot == (u32)nn->boot_time)
2210 return 0;
2211 trace_nfsd_clid_stale(clid);
2212 return 1;
2213 }
2214
2215 /*
2216 * XXX Should we use a slab cache ?
2217 * This type of memory management is somewhat inefficient, but we use it
2218 * anyway since SETCLIENTID is not a common operation.
2219 */
alloc_client(struct xdr_netobj name,struct nfsd_net * nn)2220 static struct nfs4_client *alloc_client(struct xdr_netobj name,
2221 struct nfsd_net *nn)
2222 {
2223 struct nfs4_client *clp;
2224 int i;
2225
2226 if (atomic_read(&nn->nfs4_client_count) >= nn->nfs4_max_clients) {
2227 mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
2228 return NULL;
2229 }
2230 clp = kmem_cache_zalloc(client_slab, GFP_KERNEL);
2231 if (clp == NULL)
2232 return NULL;
2233 xdr_netobj_dup(&clp->cl_name, &name, GFP_KERNEL);
2234 if (clp->cl_name.data == NULL)
2235 goto err_no_name;
2236 clp->cl_ownerstr_hashtbl = kmalloc_array(OWNER_HASH_SIZE,
2237 sizeof(struct list_head),
2238 GFP_KERNEL);
2239 if (!clp->cl_ownerstr_hashtbl)
2240 goto err_no_hashtbl;
2241 clp->cl_callback_wq = alloc_ordered_workqueue("nfsd4_callbacks", 0);
2242 if (!clp->cl_callback_wq)
2243 goto err_no_callback_wq;
2244
2245 for (i = 0; i < OWNER_HASH_SIZE; i++)
2246 INIT_LIST_HEAD(&clp->cl_ownerstr_hashtbl[i]);
2247 INIT_LIST_HEAD(&clp->cl_sessions);
2248 idr_init(&clp->cl_stateids);
2249 atomic_set(&clp->cl_rpc_users, 0);
2250 clp->cl_cb_state = NFSD4_CB_UNKNOWN;
2251 clp->cl_state = NFSD4_ACTIVE;
2252 atomic_inc(&nn->nfs4_client_count);
2253 atomic_set(&clp->cl_delegs_in_recall, 0);
2254 INIT_LIST_HEAD(&clp->cl_idhash);
2255 INIT_LIST_HEAD(&clp->cl_openowners);
2256 INIT_LIST_HEAD(&clp->cl_delegations);
2257 INIT_LIST_HEAD(&clp->cl_lru);
2258 INIT_LIST_HEAD(&clp->cl_revoked);
2259 #ifdef CONFIG_NFSD_PNFS
2260 INIT_LIST_HEAD(&clp->cl_lo_states);
2261 #endif
2262 INIT_LIST_HEAD(&clp->async_copies);
2263 spin_lock_init(&clp->async_lock);
2264 spin_lock_init(&clp->cl_lock);
2265 rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
2266 return clp;
2267 err_no_callback_wq:
2268 kfree(clp->cl_ownerstr_hashtbl);
2269 err_no_hashtbl:
2270 kfree(clp->cl_name.data);
2271 err_no_name:
2272 kmem_cache_free(client_slab, clp);
2273 return NULL;
2274 }
2275
__free_client(struct kref * k)2276 static void __free_client(struct kref *k)
2277 {
2278 struct nfsdfs_client *c = container_of(k, struct nfsdfs_client, cl_ref);
2279 struct nfs4_client *clp = container_of(c, struct nfs4_client, cl_nfsdfs);
2280
2281 free_svc_cred(&clp->cl_cred);
2282 destroy_workqueue(clp->cl_callback_wq);
2283 kfree(clp->cl_ownerstr_hashtbl);
2284 kfree(clp->cl_name.data);
2285 kfree(clp->cl_nii_domain.data);
2286 kfree(clp->cl_nii_name.data);
2287 idr_destroy(&clp->cl_stateids);
2288 kfree(clp->cl_ra);
2289 kmem_cache_free(client_slab, clp);
2290 }
2291
drop_client(struct nfs4_client * clp)2292 static void drop_client(struct nfs4_client *clp)
2293 {
2294 kref_put(&clp->cl_nfsdfs.cl_ref, __free_client);
2295 }
2296
2297 static void
free_client(struct nfs4_client * clp)2298 free_client(struct nfs4_client *clp)
2299 {
2300 while (!list_empty(&clp->cl_sessions)) {
2301 struct nfsd4_session *ses;
2302 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
2303 se_perclnt);
2304 list_del(&ses->se_perclnt);
2305 WARN_ON_ONCE(atomic_read(&ses->se_ref));
2306 free_session(ses);
2307 }
2308 rpc_destroy_wait_queue(&clp->cl_cb_waitq);
2309 if (clp->cl_nfsd_dentry) {
2310 nfsd_client_rmdir(clp->cl_nfsd_dentry);
2311 clp->cl_nfsd_dentry = NULL;
2312 wake_up_all(&expiry_wq);
2313 }
2314 drop_client(clp);
2315 }
2316
2317 /* must be called under the client_lock */
2318 static void
unhash_client_locked(struct nfs4_client * clp)2319 unhash_client_locked(struct nfs4_client *clp)
2320 {
2321 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2322 struct nfsd4_session *ses;
2323
2324 lockdep_assert_held(&nn->client_lock);
2325
2326 /* Mark the client as expired! */
2327 clp->cl_time = 0;
2328 /* Make it invisible */
2329 if (!list_empty(&clp->cl_idhash)) {
2330 list_del_init(&clp->cl_idhash);
2331 if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
2332 rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
2333 else
2334 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
2335 }
2336 list_del_init(&clp->cl_lru);
2337 spin_lock(&clp->cl_lock);
2338 list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
2339 list_del_init(&ses->se_hash);
2340 spin_unlock(&clp->cl_lock);
2341 }
2342
2343 static void
unhash_client(struct nfs4_client * clp)2344 unhash_client(struct nfs4_client *clp)
2345 {
2346 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2347
2348 spin_lock(&nn->client_lock);
2349 unhash_client_locked(clp);
2350 spin_unlock(&nn->client_lock);
2351 }
2352
mark_client_expired_locked(struct nfs4_client * clp)2353 static __be32 mark_client_expired_locked(struct nfs4_client *clp)
2354 {
2355 int users = atomic_read(&clp->cl_rpc_users);
2356
2357 trace_nfsd_mark_client_expired(clp, users);
2358
2359 if (users)
2360 return nfserr_jukebox;
2361 unhash_client_locked(clp);
2362 return nfs_ok;
2363 }
2364
2365 static void
__destroy_client(struct nfs4_client * clp)2366 __destroy_client(struct nfs4_client *clp)
2367 {
2368 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2369 int i;
2370 struct nfs4_openowner *oo;
2371 struct nfs4_delegation *dp;
2372 struct list_head reaplist;
2373
2374 INIT_LIST_HEAD(&reaplist);
2375 spin_lock(&state_lock);
2376 while (!list_empty(&clp->cl_delegations)) {
2377 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
2378 unhash_delegation_locked(dp, SC_STATUS_CLOSED);
2379 list_add(&dp->dl_recall_lru, &reaplist);
2380 }
2381 spin_unlock(&state_lock);
2382 while (!list_empty(&reaplist)) {
2383 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
2384 list_del_init(&dp->dl_recall_lru);
2385 destroy_unhashed_deleg(dp);
2386 }
2387 while (!list_empty(&clp->cl_revoked)) {
2388 dp = list_entry(clp->cl_revoked.next, struct nfs4_delegation, dl_recall_lru);
2389 list_del_init(&dp->dl_recall_lru);
2390 nfs4_put_stid(&dp->dl_stid);
2391 }
2392 while (!list_empty(&clp->cl_openowners)) {
2393 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
2394 nfs4_get_stateowner(&oo->oo_owner);
2395 release_openowner(oo);
2396 }
2397 for (i = 0; i < OWNER_HASH_SIZE; i++) {
2398 struct nfs4_stateowner *so, *tmp;
2399
2400 list_for_each_entry_safe(so, tmp, &clp->cl_ownerstr_hashtbl[i],
2401 so_strhash) {
2402 /* Should be no openowners at this point */
2403 WARN_ON_ONCE(so->so_is_open_owner);
2404 remove_blocked_locks(lockowner(so));
2405 }
2406 }
2407 nfsd4_return_all_client_layouts(clp);
2408 nfsd4_shutdown_copy(clp);
2409 nfsd4_shutdown_callback(clp);
2410 if (clp->cl_cb_conn.cb_xprt)
2411 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
2412 atomic_add_unless(&nn->nfs4_client_count, -1, 0);
2413 nfsd4_dec_courtesy_client_count(nn, clp);
2414 free_client(clp);
2415 wake_up_all(&expiry_wq);
2416 }
2417
2418 static void
destroy_client(struct nfs4_client * clp)2419 destroy_client(struct nfs4_client *clp)
2420 {
2421 unhash_client(clp);
2422 __destroy_client(clp);
2423 }
2424
inc_reclaim_complete(struct nfs4_client * clp)2425 static void inc_reclaim_complete(struct nfs4_client *clp)
2426 {
2427 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2428
2429 if (!nn->track_reclaim_completes)
2430 return;
2431 if (!nfsd4_find_reclaim_client(clp->cl_name, nn))
2432 return;
2433 if (atomic_inc_return(&nn->nr_reclaim_complete) ==
2434 nn->reclaim_str_hashtbl_size) {
2435 printk(KERN_INFO "NFSD: all clients done reclaiming, ending NFSv4 grace period (net %x)\n",
2436 clp->net->ns.inum);
2437 nfsd4_end_grace(nn);
2438 }
2439 }
2440
expire_client(struct nfs4_client * clp)2441 static void expire_client(struct nfs4_client *clp)
2442 {
2443 unhash_client(clp);
2444 nfsd4_client_record_remove(clp);
2445 __destroy_client(clp);
2446 }
2447
copy_verf(struct nfs4_client * target,nfs4_verifier * source)2448 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
2449 {
2450 memcpy(target->cl_verifier.data, source->data,
2451 sizeof(target->cl_verifier.data));
2452 }
2453
copy_clid(struct nfs4_client * target,struct nfs4_client * source)2454 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
2455 {
2456 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
2457 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
2458 }
2459
copy_cred(struct svc_cred * target,struct svc_cred * source)2460 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
2461 {
2462 target->cr_principal = kstrdup(source->cr_principal, GFP_KERNEL);
2463 target->cr_raw_principal = kstrdup(source->cr_raw_principal,
2464 GFP_KERNEL);
2465 target->cr_targ_princ = kstrdup(source->cr_targ_princ, GFP_KERNEL);
2466 if ((source->cr_principal && !target->cr_principal) ||
2467 (source->cr_raw_principal && !target->cr_raw_principal) ||
2468 (source->cr_targ_princ && !target->cr_targ_princ))
2469 return -ENOMEM;
2470
2471 target->cr_flavor = source->cr_flavor;
2472 target->cr_uid = source->cr_uid;
2473 target->cr_gid = source->cr_gid;
2474 target->cr_group_info = source->cr_group_info;
2475 get_group_info(target->cr_group_info);
2476 target->cr_gss_mech = source->cr_gss_mech;
2477 if (source->cr_gss_mech)
2478 gss_mech_get(source->cr_gss_mech);
2479 return 0;
2480 }
2481
2482 static int
compare_blob(const struct xdr_netobj * o1,const struct xdr_netobj * o2)2483 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
2484 {
2485 if (o1->len < o2->len)
2486 return -1;
2487 if (o1->len > o2->len)
2488 return 1;
2489 return memcmp(o1->data, o2->data, o1->len);
2490 }
2491
2492 static int
same_verf(nfs4_verifier * v1,nfs4_verifier * v2)2493 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
2494 {
2495 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
2496 }
2497
2498 static int
same_clid(clientid_t * cl1,clientid_t * cl2)2499 same_clid(clientid_t *cl1, clientid_t *cl2)
2500 {
2501 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
2502 }
2503
groups_equal(struct group_info * g1,struct group_info * g2)2504 static bool groups_equal(struct group_info *g1, struct group_info *g2)
2505 {
2506 int i;
2507
2508 if (g1->ngroups != g2->ngroups)
2509 return false;
2510 for (i=0; i<g1->ngroups; i++)
2511 if (!gid_eq(g1->gid[i], g2->gid[i]))
2512 return false;
2513 return true;
2514 }
2515
2516 /*
2517 * RFC 3530 language requires clid_inuse be returned when the
2518 * "principal" associated with a requests differs from that previously
2519 * used. We use uid, gid's, and gss principal string as our best
2520 * approximation. We also don't want to allow non-gss use of a client
2521 * established using gss: in theory cr_principal should catch that
2522 * change, but in practice cr_principal can be null even in the gss case
2523 * since gssd doesn't always pass down a principal string.
2524 */
is_gss_cred(struct svc_cred * cr)2525 static bool is_gss_cred(struct svc_cred *cr)
2526 {
2527 /* Is cr_flavor one of the gss "pseudoflavors"?: */
2528 return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
2529 }
2530
2531
2532 static bool
same_creds(struct svc_cred * cr1,struct svc_cred * cr2)2533 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
2534 {
2535 if ((is_gss_cred(cr1) != is_gss_cred(cr2))
2536 || (!uid_eq(cr1->cr_uid, cr2->cr_uid))
2537 || (!gid_eq(cr1->cr_gid, cr2->cr_gid))
2538 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
2539 return false;
2540 /* XXX: check that cr_targ_princ fields match ? */
2541 if (cr1->cr_principal == cr2->cr_principal)
2542 return true;
2543 if (!cr1->cr_principal || !cr2->cr_principal)
2544 return false;
2545 return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
2546 }
2547
svc_rqst_integrity_protected(struct svc_rqst * rqstp)2548 static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
2549 {
2550 struct svc_cred *cr = &rqstp->rq_cred;
2551 u32 service;
2552
2553 if (!cr->cr_gss_mech)
2554 return false;
2555 service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
2556 return service == RPC_GSS_SVC_INTEGRITY ||
2557 service == RPC_GSS_SVC_PRIVACY;
2558 }
2559
nfsd4_mach_creds_match(struct nfs4_client * cl,struct svc_rqst * rqstp)2560 bool nfsd4_mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
2561 {
2562 struct svc_cred *cr = &rqstp->rq_cred;
2563
2564 if (!cl->cl_mach_cred)
2565 return true;
2566 if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
2567 return false;
2568 if (!svc_rqst_integrity_protected(rqstp))
2569 return false;
2570 if (cl->cl_cred.cr_raw_principal)
2571 return 0 == strcmp(cl->cl_cred.cr_raw_principal,
2572 cr->cr_raw_principal);
2573 if (!cr->cr_principal)
2574 return false;
2575 return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
2576 }
2577
gen_confirm(struct nfs4_client * clp,struct nfsd_net * nn)2578 static void gen_confirm(struct nfs4_client *clp, struct nfsd_net *nn)
2579 {
2580 __be32 verf[2];
2581
2582 /*
2583 * This is opaque to client, so no need to byte-swap. Use
2584 * __force to keep sparse happy
2585 */
2586 verf[0] = (__force __be32)(u32)ktime_get_real_seconds();
2587 verf[1] = (__force __be32)nn->clverifier_counter++;
2588 memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
2589 }
2590
gen_clid(struct nfs4_client * clp,struct nfsd_net * nn)2591 static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
2592 {
2593 clp->cl_clientid.cl_boot = (u32)nn->boot_time;
2594 clp->cl_clientid.cl_id = nn->clientid_counter++;
2595 gen_confirm(clp, nn);
2596 }
2597
2598 static struct nfs4_stid *
find_stateid_locked(struct nfs4_client * cl,stateid_t * t)2599 find_stateid_locked(struct nfs4_client *cl, stateid_t *t)
2600 {
2601 struct nfs4_stid *ret;
2602
2603 ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
2604 if (!ret || !ret->sc_type)
2605 return NULL;
2606 return ret;
2607 }
2608
2609 static struct nfs4_stid *
find_stateid_by_type(struct nfs4_client * cl,stateid_t * t,unsigned short typemask,unsigned short ok_states)2610 find_stateid_by_type(struct nfs4_client *cl, stateid_t *t,
2611 unsigned short typemask, unsigned short ok_states)
2612 {
2613 struct nfs4_stid *s;
2614
2615 spin_lock(&cl->cl_lock);
2616 s = find_stateid_locked(cl, t);
2617 if (s != NULL) {
2618 if ((s->sc_status & ~ok_states) == 0 &&
2619 (typemask & s->sc_type))
2620 refcount_inc(&s->sc_count);
2621 else
2622 s = NULL;
2623 }
2624 spin_unlock(&cl->cl_lock);
2625 return s;
2626 }
2627
get_nfsdfs_clp(struct inode * inode)2628 static struct nfs4_client *get_nfsdfs_clp(struct inode *inode)
2629 {
2630 struct nfsdfs_client *nc;
2631 nc = get_nfsdfs_client(inode);
2632 if (!nc)
2633 return NULL;
2634 return container_of(nc, struct nfs4_client, cl_nfsdfs);
2635 }
2636
seq_quote_mem(struct seq_file * m,char * data,int len)2637 static void seq_quote_mem(struct seq_file *m, char *data, int len)
2638 {
2639 seq_puts(m, "\"");
2640 seq_escape_mem(m, data, len, ESCAPE_HEX | ESCAPE_NAP | ESCAPE_APPEND, "\"\\");
2641 seq_puts(m, "\"");
2642 }
2643
cb_state2str(int state)2644 static const char *cb_state2str(int state)
2645 {
2646 switch (state) {
2647 case NFSD4_CB_UP:
2648 return "UP";
2649 case NFSD4_CB_UNKNOWN:
2650 return "UNKNOWN";
2651 case NFSD4_CB_DOWN:
2652 return "DOWN";
2653 case NFSD4_CB_FAULT:
2654 return "FAULT";
2655 }
2656 return "UNDEFINED";
2657 }
2658
client_info_show(struct seq_file * m,void * v)2659 static int client_info_show(struct seq_file *m, void *v)
2660 {
2661 struct inode *inode = file_inode(m->file);
2662 struct nfs4_client *clp;
2663 u64 clid;
2664
2665 clp = get_nfsdfs_clp(inode);
2666 if (!clp)
2667 return -ENXIO;
2668 memcpy(&clid, &clp->cl_clientid, sizeof(clid));
2669 seq_printf(m, "clientid: 0x%llx\n", clid);
2670 seq_printf(m, "address: \"%pISpc\"\n", (struct sockaddr *)&clp->cl_addr);
2671
2672 if (clp->cl_state == NFSD4_COURTESY)
2673 seq_puts(m, "status: courtesy\n");
2674 else if (clp->cl_state == NFSD4_EXPIRABLE)
2675 seq_puts(m, "status: expirable\n");
2676 else if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
2677 seq_puts(m, "status: confirmed\n");
2678 else
2679 seq_puts(m, "status: unconfirmed\n");
2680 seq_printf(m, "seconds from last renew: %lld\n",
2681 ktime_get_boottime_seconds() - clp->cl_time);
2682 seq_puts(m, "name: ");
2683 seq_quote_mem(m, clp->cl_name.data, clp->cl_name.len);
2684 seq_printf(m, "\nminor version: %d\n", clp->cl_minorversion);
2685 if (clp->cl_nii_domain.data) {
2686 seq_puts(m, "Implementation domain: ");
2687 seq_quote_mem(m, clp->cl_nii_domain.data,
2688 clp->cl_nii_domain.len);
2689 seq_puts(m, "\nImplementation name: ");
2690 seq_quote_mem(m, clp->cl_nii_name.data, clp->cl_nii_name.len);
2691 seq_printf(m, "\nImplementation time: [%lld, %ld]\n",
2692 clp->cl_nii_time.tv_sec, clp->cl_nii_time.tv_nsec);
2693 }
2694 seq_printf(m, "callback state: %s\n", cb_state2str(clp->cl_cb_state));
2695 seq_printf(m, "callback address: %pISpc\n", &clp->cl_cb_conn.cb_addr);
2696 seq_printf(m, "admin-revoked states: %d\n",
2697 atomic_read(&clp->cl_admin_revoked));
2698 drop_client(clp);
2699
2700 return 0;
2701 }
2702
2703 DEFINE_SHOW_ATTRIBUTE(client_info);
2704
states_start(struct seq_file * s,loff_t * pos)2705 static void *states_start(struct seq_file *s, loff_t *pos)
2706 __acquires(&clp->cl_lock)
2707 {
2708 struct nfs4_client *clp = s->private;
2709 unsigned long id = *pos;
2710 void *ret;
2711
2712 spin_lock(&clp->cl_lock);
2713 ret = idr_get_next_ul(&clp->cl_stateids, &id);
2714 *pos = id;
2715 return ret;
2716 }
2717
states_next(struct seq_file * s,void * v,loff_t * pos)2718 static void *states_next(struct seq_file *s, void *v, loff_t *pos)
2719 {
2720 struct nfs4_client *clp = s->private;
2721 unsigned long id = *pos;
2722 void *ret;
2723
2724 id = *pos;
2725 id++;
2726 ret = idr_get_next_ul(&clp->cl_stateids, &id);
2727 *pos = id;
2728 return ret;
2729 }
2730
states_stop(struct seq_file * s,void * v)2731 static void states_stop(struct seq_file *s, void *v)
2732 __releases(&clp->cl_lock)
2733 {
2734 struct nfs4_client *clp = s->private;
2735
2736 spin_unlock(&clp->cl_lock);
2737 }
2738
nfs4_show_fname(struct seq_file * s,struct nfsd_file * f)2739 static void nfs4_show_fname(struct seq_file *s, struct nfsd_file *f)
2740 {
2741 seq_printf(s, "filename: \"%pD2\"", f->nf_file);
2742 }
2743
nfs4_show_superblock(struct seq_file * s,struct nfsd_file * f)2744 static void nfs4_show_superblock(struct seq_file *s, struct nfsd_file *f)
2745 {
2746 struct inode *inode = file_inode(f->nf_file);
2747
2748 seq_printf(s, "superblock: \"%02x:%02x:%ld\"",
2749 MAJOR(inode->i_sb->s_dev),
2750 MINOR(inode->i_sb->s_dev),
2751 inode->i_ino);
2752 }
2753
nfs4_show_owner(struct seq_file * s,struct nfs4_stateowner * oo)2754 static void nfs4_show_owner(struct seq_file *s, struct nfs4_stateowner *oo)
2755 {
2756 seq_puts(s, "owner: ");
2757 seq_quote_mem(s, oo->so_owner.data, oo->so_owner.len);
2758 }
2759
nfs4_show_stateid(struct seq_file * s,stateid_t * stid)2760 static void nfs4_show_stateid(struct seq_file *s, stateid_t *stid)
2761 {
2762 seq_printf(s, "0x%.8x", stid->si_generation);
2763 seq_printf(s, "%12phN", &stid->si_opaque);
2764 }
2765
nfs4_show_open(struct seq_file * s,struct nfs4_stid * st)2766 static int nfs4_show_open(struct seq_file *s, struct nfs4_stid *st)
2767 {
2768 struct nfs4_ol_stateid *ols;
2769 struct nfs4_file *nf;
2770 struct nfsd_file *file;
2771 struct nfs4_stateowner *oo;
2772 unsigned int access, deny;
2773
2774 ols = openlockstateid(st);
2775 oo = ols->st_stateowner;
2776 nf = st->sc_file;
2777
2778 seq_puts(s, "- ");
2779 nfs4_show_stateid(s, &st->sc_stateid);
2780 seq_puts(s, ": { type: open, ");
2781
2782 access = bmap_to_share_mode(ols->st_access_bmap);
2783 deny = bmap_to_share_mode(ols->st_deny_bmap);
2784
2785 seq_printf(s, "access: %s%s, ",
2786 access & NFS4_SHARE_ACCESS_READ ? "r" : "-",
2787 access & NFS4_SHARE_ACCESS_WRITE ? "w" : "-");
2788 seq_printf(s, "deny: %s%s, ",
2789 deny & NFS4_SHARE_ACCESS_READ ? "r" : "-",
2790 deny & NFS4_SHARE_ACCESS_WRITE ? "w" : "-");
2791
2792 spin_lock(&nf->fi_lock);
2793 file = find_any_file_locked(nf);
2794 if (file) {
2795 nfs4_show_superblock(s, file);
2796 seq_puts(s, ", ");
2797 nfs4_show_fname(s, file);
2798 seq_puts(s, ", ");
2799 }
2800 spin_unlock(&nf->fi_lock);
2801 nfs4_show_owner(s, oo);
2802 if (st->sc_status & SC_STATUS_ADMIN_REVOKED)
2803 seq_puts(s, ", admin-revoked");
2804 seq_puts(s, " }\n");
2805 return 0;
2806 }
2807
nfs4_show_lock(struct seq_file * s,struct nfs4_stid * st)2808 static int nfs4_show_lock(struct seq_file *s, struct nfs4_stid *st)
2809 {
2810 struct nfs4_ol_stateid *ols;
2811 struct nfs4_file *nf;
2812 struct nfsd_file *file;
2813 struct nfs4_stateowner *oo;
2814
2815 ols = openlockstateid(st);
2816 oo = ols->st_stateowner;
2817 nf = st->sc_file;
2818
2819 seq_puts(s, "- ");
2820 nfs4_show_stateid(s, &st->sc_stateid);
2821 seq_puts(s, ": { type: lock, ");
2822
2823 spin_lock(&nf->fi_lock);
2824 file = find_any_file_locked(nf);
2825 if (file) {
2826 /*
2827 * Note: a lock stateid isn't really the same thing as a lock,
2828 * it's the locking state held by one owner on a file, and there
2829 * may be multiple (or no) lock ranges associated with it.
2830 * (Same for the matter is true of open stateids.)
2831 */
2832
2833 nfs4_show_superblock(s, file);
2834 /* XXX: open stateid? */
2835 seq_puts(s, ", ");
2836 nfs4_show_fname(s, file);
2837 seq_puts(s, ", ");
2838 }
2839 nfs4_show_owner(s, oo);
2840 if (st->sc_status & SC_STATUS_ADMIN_REVOKED)
2841 seq_puts(s, ", admin-revoked");
2842 seq_puts(s, " }\n");
2843 spin_unlock(&nf->fi_lock);
2844 return 0;
2845 }
2846
nfs4_show_deleg(struct seq_file * s,struct nfs4_stid * st)2847 static int nfs4_show_deleg(struct seq_file *s, struct nfs4_stid *st)
2848 {
2849 struct nfs4_delegation *ds;
2850 struct nfs4_file *nf;
2851 struct nfsd_file *file;
2852
2853 ds = delegstateid(st);
2854 nf = st->sc_file;
2855
2856 seq_puts(s, "- ");
2857 nfs4_show_stateid(s, &st->sc_stateid);
2858 seq_puts(s, ": { type: deleg, ");
2859
2860 seq_printf(s, "access: %s",
2861 ds->dl_type == NFS4_OPEN_DELEGATE_READ ? "r" : "w");
2862
2863 /* XXX: lease time, whether it's being recalled. */
2864
2865 spin_lock(&nf->fi_lock);
2866 file = nf->fi_deleg_file;
2867 if (file) {
2868 seq_puts(s, ", ");
2869 nfs4_show_superblock(s, file);
2870 seq_puts(s, ", ");
2871 nfs4_show_fname(s, file);
2872 }
2873 spin_unlock(&nf->fi_lock);
2874 if (st->sc_status & SC_STATUS_ADMIN_REVOKED)
2875 seq_puts(s, ", admin-revoked");
2876 seq_puts(s, " }\n");
2877 return 0;
2878 }
2879
nfs4_show_layout(struct seq_file * s,struct nfs4_stid * st)2880 static int nfs4_show_layout(struct seq_file *s, struct nfs4_stid *st)
2881 {
2882 struct nfs4_layout_stateid *ls;
2883 struct nfsd_file *file;
2884
2885 ls = container_of(st, struct nfs4_layout_stateid, ls_stid);
2886
2887 seq_puts(s, "- ");
2888 nfs4_show_stateid(s, &st->sc_stateid);
2889 seq_puts(s, ": { type: layout");
2890
2891 /* XXX: What else would be useful? */
2892
2893 spin_lock(&ls->ls_stid.sc_file->fi_lock);
2894 file = ls->ls_file;
2895 if (file) {
2896 seq_puts(s, ", ");
2897 nfs4_show_superblock(s, file);
2898 seq_puts(s, ", ");
2899 nfs4_show_fname(s, file);
2900 }
2901 spin_unlock(&ls->ls_stid.sc_file->fi_lock);
2902 if (st->sc_status & SC_STATUS_ADMIN_REVOKED)
2903 seq_puts(s, ", admin-revoked");
2904 seq_puts(s, " }\n");
2905
2906 return 0;
2907 }
2908
states_show(struct seq_file * s,void * v)2909 static int states_show(struct seq_file *s, void *v)
2910 {
2911 struct nfs4_stid *st = v;
2912
2913 switch (st->sc_type) {
2914 case SC_TYPE_OPEN:
2915 return nfs4_show_open(s, st);
2916 case SC_TYPE_LOCK:
2917 return nfs4_show_lock(s, st);
2918 case SC_TYPE_DELEG:
2919 return nfs4_show_deleg(s, st);
2920 case SC_TYPE_LAYOUT:
2921 return nfs4_show_layout(s, st);
2922 default:
2923 return 0; /* XXX: or SEQ_SKIP? */
2924 }
2925 /* XXX: copy stateids? */
2926 }
2927
2928 static struct seq_operations states_seq_ops = {
2929 .start = states_start,
2930 .next = states_next,
2931 .stop = states_stop,
2932 .show = states_show
2933 };
2934
client_states_open(struct inode * inode,struct file * file)2935 static int client_states_open(struct inode *inode, struct file *file)
2936 {
2937 struct seq_file *s;
2938 struct nfs4_client *clp;
2939 int ret;
2940
2941 clp = get_nfsdfs_clp(inode);
2942 if (!clp)
2943 return -ENXIO;
2944
2945 ret = seq_open(file, &states_seq_ops);
2946 if (ret)
2947 return ret;
2948 s = file->private_data;
2949 s->private = clp;
2950 return 0;
2951 }
2952
client_opens_release(struct inode * inode,struct file * file)2953 static int client_opens_release(struct inode *inode, struct file *file)
2954 {
2955 struct seq_file *m = file->private_data;
2956 struct nfs4_client *clp = m->private;
2957
2958 /* XXX: alternatively, we could get/drop in seq start/stop */
2959 drop_client(clp);
2960 return seq_release(inode, file);
2961 }
2962
2963 static const struct file_operations client_states_fops = {
2964 .open = client_states_open,
2965 .read = seq_read,
2966 .llseek = seq_lseek,
2967 .release = client_opens_release,
2968 };
2969
2970 /*
2971 * Normally we refuse to destroy clients that are in use, but here the
2972 * administrator is telling us to just do it. We also want to wait
2973 * so the caller has a guarantee that the client's locks are gone by
2974 * the time the write returns:
2975 */
force_expire_client(struct nfs4_client * clp)2976 static void force_expire_client(struct nfs4_client *clp)
2977 {
2978 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2979 bool already_expired;
2980
2981 trace_nfsd_clid_admin_expired(&clp->cl_clientid);
2982
2983 spin_lock(&nn->client_lock);
2984 clp->cl_time = 0;
2985 spin_unlock(&nn->client_lock);
2986
2987 wait_event(expiry_wq, atomic_read(&clp->cl_rpc_users) == 0);
2988 spin_lock(&nn->client_lock);
2989 already_expired = list_empty(&clp->cl_lru);
2990 if (!already_expired)
2991 unhash_client_locked(clp);
2992 spin_unlock(&nn->client_lock);
2993
2994 if (!already_expired)
2995 expire_client(clp);
2996 else
2997 wait_event(expiry_wq, clp->cl_nfsd_dentry == NULL);
2998 }
2999
client_ctl_write(struct file * file,const char __user * buf,size_t size,loff_t * pos)3000 static ssize_t client_ctl_write(struct file *file, const char __user *buf,
3001 size_t size, loff_t *pos)
3002 {
3003 char *data;
3004 struct nfs4_client *clp;
3005
3006 data = simple_transaction_get(file, buf, size);
3007 if (IS_ERR(data))
3008 return PTR_ERR(data);
3009 if (size != 7 || 0 != memcmp(data, "expire\n", 7))
3010 return -EINVAL;
3011 clp = get_nfsdfs_clp(file_inode(file));
3012 if (!clp)
3013 return -ENXIO;
3014 force_expire_client(clp);
3015 drop_client(clp);
3016 return 7;
3017 }
3018
3019 static const struct file_operations client_ctl_fops = {
3020 .write = client_ctl_write,
3021 .release = simple_transaction_release,
3022 };
3023
3024 static const struct tree_descr client_files[] = {
3025 [0] = {"info", &client_info_fops, S_IRUSR},
3026 [1] = {"states", &client_states_fops, S_IRUSR},
3027 [2] = {"ctl", &client_ctl_fops, S_IWUSR},
3028 [3] = {""},
3029 };
3030
3031 static int
nfsd4_cb_recall_any_done(struct nfsd4_callback * cb,struct rpc_task * task)3032 nfsd4_cb_recall_any_done(struct nfsd4_callback *cb,
3033 struct rpc_task *task)
3034 {
3035 trace_nfsd_cb_recall_any_done(cb, task);
3036 switch (task->tk_status) {
3037 case -NFS4ERR_DELAY:
3038 rpc_delay(task, 2 * HZ);
3039 return 0;
3040 default:
3041 return 1;
3042 }
3043 }
3044
3045 static void
nfsd4_cb_recall_any_release(struct nfsd4_callback * cb)3046 nfsd4_cb_recall_any_release(struct nfsd4_callback *cb)
3047 {
3048 struct nfs4_client *clp = cb->cb_clp;
3049
3050 clear_bit(NFSD4_CLIENT_CB_RECALL_ANY, &clp->cl_flags);
3051 drop_client(clp);
3052 }
3053
3054 static int
nfsd4_cb_getattr_done(struct nfsd4_callback * cb,struct rpc_task * task)3055 nfsd4_cb_getattr_done(struct nfsd4_callback *cb, struct rpc_task *task)
3056 {
3057 struct nfs4_cb_fattr *ncf =
3058 container_of(cb, struct nfs4_cb_fattr, ncf_getattr);
3059
3060 ncf->ncf_cb_status = task->tk_status;
3061 switch (task->tk_status) {
3062 case -NFS4ERR_DELAY:
3063 rpc_delay(task, 2 * HZ);
3064 return 0;
3065 default:
3066 return 1;
3067 }
3068 }
3069
3070 static void
nfsd4_cb_getattr_release(struct nfsd4_callback * cb)3071 nfsd4_cb_getattr_release(struct nfsd4_callback *cb)
3072 {
3073 struct nfs4_cb_fattr *ncf =
3074 container_of(cb, struct nfs4_cb_fattr, ncf_getattr);
3075 struct nfs4_delegation *dp =
3076 container_of(ncf, struct nfs4_delegation, dl_cb_fattr);
3077
3078 nfs4_put_stid(&dp->dl_stid);
3079 clear_bit(CB_GETATTR_BUSY, &ncf->ncf_cb_flags);
3080 wake_up_bit(&ncf->ncf_cb_flags, CB_GETATTR_BUSY);
3081 }
3082
3083 static const struct nfsd4_callback_ops nfsd4_cb_recall_any_ops = {
3084 .done = nfsd4_cb_recall_any_done,
3085 .release = nfsd4_cb_recall_any_release,
3086 };
3087
3088 static const struct nfsd4_callback_ops nfsd4_cb_getattr_ops = {
3089 .done = nfsd4_cb_getattr_done,
3090 .release = nfsd4_cb_getattr_release,
3091 };
3092
nfs4_cb_getattr(struct nfs4_cb_fattr * ncf)3093 static void nfs4_cb_getattr(struct nfs4_cb_fattr *ncf)
3094 {
3095 struct nfs4_delegation *dp =
3096 container_of(ncf, struct nfs4_delegation, dl_cb_fattr);
3097
3098 if (test_and_set_bit(CB_GETATTR_BUSY, &ncf->ncf_cb_flags))
3099 return;
3100 /* set to proper status when nfsd4_cb_getattr_done runs */
3101 ncf->ncf_cb_status = NFS4ERR_IO;
3102
3103 refcount_inc(&dp->dl_stid.sc_count);
3104 nfsd4_run_cb(&ncf->ncf_getattr);
3105 }
3106
create_client(struct xdr_netobj name,struct svc_rqst * rqstp,nfs4_verifier * verf)3107 static struct nfs4_client *create_client(struct xdr_netobj name,
3108 struct svc_rqst *rqstp, nfs4_verifier *verf)
3109 {
3110 struct nfs4_client *clp;
3111 struct sockaddr *sa = svc_addr(rqstp);
3112 int ret;
3113 struct net *net = SVC_NET(rqstp);
3114 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3115 struct dentry *dentries[ARRAY_SIZE(client_files)];
3116
3117 clp = alloc_client(name, nn);
3118 if (clp == NULL)
3119 return NULL;
3120
3121 ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
3122 if (ret) {
3123 free_client(clp);
3124 return NULL;
3125 }
3126 gen_clid(clp, nn);
3127 kref_init(&clp->cl_nfsdfs.cl_ref);
3128 nfsd4_init_cb(&clp->cl_cb_null, clp, NULL, NFSPROC4_CLNT_CB_NULL);
3129 clp->cl_time = ktime_get_boottime_seconds();
3130 clear_bit(0, &clp->cl_cb_slot_busy);
3131 copy_verf(clp, verf);
3132 memcpy(&clp->cl_addr, sa, sizeof(struct sockaddr_storage));
3133 clp->cl_cb_session = NULL;
3134 clp->net = net;
3135 clp->cl_nfsd_dentry = nfsd_client_mkdir(
3136 nn, &clp->cl_nfsdfs,
3137 clp->cl_clientid.cl_id - nn->clientid_base,
3138 client_files, dentries);
3139 clp->cl_nfsd_info_dentry = dentries[0];
3140 if (!clp->cl_nfsd_dentry) {
3141 free_client(clp);
3142 return NULL;
3143 }
3144 clp->cl_ra = kzalloc(sizeof(*clp->cl_ra), GFP_KERNEL);
3145 if (!clp->cl_ra) {
3146 free_client(clp);
3147 return NULL;
3148 }
3149 clp->cl_ra_time = 0;
3150 nfsd4_init_cb(&clp->cl_ra->ra_cb, clp, &nfsd4_cb_recall_any_ops,
3151 NFSPROC4_CLNT_CB_RECALL_ANY);
3152 return clp;
3153 }
3154
3155 static void
add_clp_to_name_tree(struct nfs4_client * new_clp,struct rb_root * root)3156 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
3157 {
3158 struct rb_node **new = &(root->rb_node), *parent = NULL;
3159 struct nfs4_client *clp;
3160
3161 while (*new) {
3162 clp = rb_entry(*new, struct nfs4_client, cl_namenode);
3163 parent = *new;
3164
3165 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
3166 new = &((*new)->rb_left);
3167 else
3168 new = &((*new)->rb_right);
3169 }
3170
3171 rb_link_node(&new_clp->cl_namenode, parent, new);
3172 rb_insert_color(&new_clp->cl_namenode, root);
3173 }
3174
3175 static struct nfs4_client *
find_clp_in_name_tree(struct xdr_netobj * name,struct rb_root * root)3176 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
3177 {
3178 int cmp;
3179 struct rb_node *node = root->rb_node;
3180 struct nfs4_client *clp;
3181
3182 while (node) {
3183 clp = rb_entry(node, struct nfs4_client, cl_namenode);
3184 cmp = compare_blob(&clp->cl_name, name);
3185 if (cmp > 0)
3186 node = node->rb_left;
3187 else if (cmp < 0)
3188 node = node->rb_right;
3189 else
3190 return clp;
3191 }
3192 return NULL;
3193 }
3194
3195 static void
add_to_unconfirmed(struct nfs4_client * clp)3196 add_to_unconfirmed(struct nfs4_client *clp)
3197 {
3198 unsigned int idhashval;
3199 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
3200
3201 lockdep_assert_held(&nn->client_lock);
3202
3203 clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
3204 add_clp_to_name_tree(clp, &nn->unconf_name_tree);
3205 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
3206 list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
3207 renew_client_locked(clp);
3208 }
3209
3210 static void
move_to_confirmed(struct nfs4_client * clp)3211 move_to_confirmed(struct nfs4_client *clp)
3212 {
3213 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
3214 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
3215
3216 lockdep_assert_held(&nn->client_lock);
3217
3218 list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
3219 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
3220 add_clp_to_name_tree(clp, &nn->conf_name_tree);
3221 set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
3222 trace_nfsd_clid_confirmed(&clp->cl_clientid);
3223 renew_client_locked(clp);
3224 }
3225
3226 static struct nfs4_client *
find_client_in_id_table(struct list_head * tbl,clientid_t * clid,bool sessions)3227 find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
3228 {
3229 struct nfs4_client *clp;
3230 unsigned int idhashval = clientid_hashval(clid->cl_id);
3231
3232 list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
3233 if (same_clid(&clp->cl_clientid, clid)) {
3234 if ((bool)clp->cl_minorversion != sessions)
3235 return NULL;
3236 renew_client_locked(clp);
3237 return clp;
3238 }
3239 }
3240 return NULL;
3241 }
3242
3243 static struct nfs4_client *
find_confirmed_client(clientid_t * clid,bool sessions,struct nfsd_net * nn)3244 find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
3245 {
3246 struct list_head *tbl = nn->conf_id_hashtbl;
3247
3248 lockdep_assert_held(&nn->client_lock);
3249 return find_client_in_id_table(tbl, clid, sessions);
3250 }
3251
3252 static struct nfs4_client *
find_unconfirmed_client(clientid_t * clid,bool sessions,struct nfsd_net * nn)3253 find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
3254 {
3255 struct list_head *tbl = nn->unconf_id_hashtbl;
3256
3257 lockdep_assert_held(&nn->client_lock);
3258 return find_client_in_id_table(tbl, clid, sessions);
3259 }
3260
clp_used_exchangeid(struct nfs4_client * clp)3261 static bool clp_used_exchangeid(struct nfs4_client *clp)
3262 {
3263 return clp->cl_exchange_flags != 0;
3264 }
3265
3266 static struct nfs4_client *
find_confirmed_client_by_name(struct xdr_netobj * name,struct nfsd_net * nn)3267 find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
3268 {
3269 lockdep_assert_held(&nn->client_lock);
3270 return find_clp_in_name_tree(name, &nn->conf_name_tree);
3271 }
3272
3273 static struct nfs4_client *
find_unconfirmed_client_by_name(struct xdr_netobj * name,struct nfsd_net * nn)3274 find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
3275 {
3276 lockdep_assert_held(&nn->client_lock);
3277 return find_clp_in_name_tree(name, &nn->unconf_name_tree);
3278 }
3279
3280 static void
gen_callback(struct nfs4_client * clp,struct nfsd4_setclientid * se,struct svc_rqst * rqstp)3281 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
3282 {
3283 struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
3284 struct sockaddr *sa = svc_addr(rqstp);
3285 u32 scopeid = rpc_get_scope_id(sa);
3286 unsigned short expected_family;
3287
3288 /* Currently, we only support tcp and tcp6 for the callback channel */
3289 if (se->se_callback_netid_len == 3 &&
3290 !memcmp(se->se_callback_netid_val, "tcp", 3))
3291 expected_family = AF_INET;
3292 else if (se->se_callback_netid_len == 4 &&
3293 !memcmp(se->se_callback_netid_val, "tcp6", 4))
3294 expected_family = AF_INET6;
3295 else
3296 goto out_err;
3297
3298 conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
3299 se->se_callback_addr_len,
3300 (struct sockaddr *)&conn->cb_addr,
3301 sizeof(conn->cb_addr));
3302
3303 if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
3304 goto out_err;
3305
3306 if (conn->cb_addr.ss_family == AF_INET6)
3307 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
3308
3309 conn->cb_prog = se->se_callback_prog;
3310 conn->cb_ident = se->se_callback_ident;
3311 memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
3312 trace_nfsd_cb_args(clp, conn);
3313 return;
3314 out_err:
3315 conn->cb_addr.ss_family = AF_UNSPEC;
3316 conn->cb_addrlen = 0;
3317 trace_nfsd_cb_nodelegs(clp);
3318 return;
3319 }
3320
3321 /*
3322 * Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
3323 */
3324 static void
nfsd4_store_cache_entry(struct nfsd4_compoundres * resp)3325 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
3326 {
3327 struct xdr_buf *buf = resp->xdr->buf;
3328 struct nfsd4_slot *slot = resp->cstate.slot;
3329 unsigned int base;
3330
3331 dprintk("--> %s slot %p\n", __func__, slot);
3332
3333 slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
3334 slot->sl_opcnt = resp->opcnt;
3335 slot->sl_status = resp->cstate.status;
3336 free_svc_cred(&slot->sl_cred);
3337 copy_cred(&slot->sl_cred, &resp->rqstp->rq_cred);
3338
3339 if (!nfsd4_cache_this(resp)) {
3340 slot->sl_flags &= ~NFSD4_SLOT_CACHED;
3341 return;
3342 }
3343 slot->sl_flags |= NFSD4_SLOT_CACHED;
3344
3345 base = resp->cstate.data_offset;
3346 slot->sl_datalen = buf->len - base;
3347 if (read_bytes_from_xdr_buf(buf, base, slot->sl_data, slot->sl_datalen))
3348 WARN(1, "%s: sessions DRC could not cache compound\n",
3349 __func__);
3350 return;
3351 }
3352
3353 /*
3354 * Encode the replay sequence operation from the slot values.
3355 * If cachethis is FALSE encode the uncached rep error on the next
3356 * operation which sets resp->p and increments resp->opcnt for
3357 * nfs4svc_encode_compoundres.
3358 *
3359 */
3360 static __be32
nfsd4_enc_sequence_replay(struct nfsd4_compoundargs * args,struct nfsd4_compoundres * resp)3361 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
3362 struct nfsd4_compoundres *resp)
3363 {
3364 struct nfsd4_op *op;
3365 struct nfsd4_slot *slot = resp->cstate.slot;
3366
3367 /* Encode the replayed sequence operation */
3368 op = &args->ops[resp->opcnt - 1];
3369 nfsd4_encode_operation(resp, op);
3370
3371 if (slot->sl_flags & NFSD4_SLOT_CACHED)
3372 return op->status;
3373 if (args->opcnt == 1) {
3374 /*
3375 * The original operation wasn't a solo sequence--we
3376 * always cache those--so this retry must not match the
3377 * original:
3378 */
3379 op->status = nfserr_seq_false_retry;
3380 } else {
3381 op = &args->ops[resp->opcnt++];
3382 op->status = nfserr_retry_uncached_rep;
3383 nfsd4_encode_operation(resp, op);
3384 }
3385 return op->status;
3386 }
3387
3388 /*
3389 * The sequence operation is not cached because we can use the slot and
3390 * session values.
3391 */
3392 static __be32
nfsd4_replay_cache_entry(struct nfsd4_compoundres * resp,struct nfsd4_sequence * seq)3393 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
3394 struct nfsd4_sequence *seq)
3395 {
3396 struct nfsd4_slot *slot = resp->cstate.slot;
3397 struct xdr_stream *xdr = resp->xdr;
3398 __be32 *p;
3399 __be32 status;
3400
3401 dprintk("--> %s slot %p\n", __func__, slot);
3402
3403 status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
3404 if (status)
3405 return status;
3406
3407 p = xdr_reserve_space(xdr, slot->sl_datalen);
3408 if (!p) {
3409 WARN_ON_ONCE(1);
3410 return nfserr_serverfault;
3411 }
3412 xdr_encode_opaque_fixed(p, slot->sl_data, slot->sl_datalen);
3413 xdr_commit_encode(xdr);
3414
3415 resp->opcnt = slot->sl_opcnt;
3416 return slot->sl_status;
3417 }
3418
3419 /*
3420 * Set the exchange_id flags returned by the server.
3421 */
3422 static void
nfsd4_set_ex_flags(struct nfs4_client * new,struct nfsd4_exchange_id * clid)3423 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
3424 {
3425 #ifdef CONFIG_NFSD_PNFS
3426 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_PNFS_MDS;
3427 #else
3428 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
3429 #endif
3430
3431 /* Referrals are supported, Migration is not. */
3432 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
3433
3434 /* set the wire flags to return to client. */
3435 clid->flags = new->cl_exchange_flags;
3436 }
3437
client_has_openowners(struct nfs4_client * clp)3438 static bool client_has_openowners(struct nfs4_client *clp)
3439 {
3440 struct nfs4_openowner *oo;
3441
3442 list_for_each_entry(oo, &clp->cl_openowners, oo_perclient) {
3443 if (!list_empty(&oo->oo_owner.so_stateids))
3444 return true;
3445 }
3446 return false;
3447 }
3448
client_has_state(struct nfs4_client * clp)3449 static bool client_has_state(struct nfs4_client *clp)
3450 {
3451 return client_has_openowners(clp)
3452 #ifdef CONFIG_NFSD_PNFS
3453 || !list_empty(&clp->cl_lo_states)
3454 #endif
3455 || !list_empty(&clp->cl_delegations)
3456 || !list_empty(&clp->cl_sessions)
3457 || !list_empty(&clp->async_copies);
3458 }
3459
copy_impl_id(struct nfs4_client * clp,struct nfsd4_exchange_id * exid)3460 static __be32 copy_impl_id(struct nfs4_client *clp,
3461 struct nfsd4_exchange_id *exid)
3462 {
3463 if (!exid->nii_domain.data)
3464 return 0;
3465 xdr_netobj_dup(&clp->cl_nii_domain, &exid->nii_domain, GFP_KERNEL);
3466 if (!clp->cl_nii_domain.data)
3467 return nfserr_jukebox;
3468 xdr_netobj_dup(&clp->cl_nii_name, &exid->nii_name, GFP_KERNEL);
3469 if (!clp->cl_nii_name.data)
3470 return nfserr_jukebox;
3471 clp->cl_nii_time = exid->nii_time;
3472 return 0;
3473 }
3474
3475 __be32
nfsd4_exchange_id(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)3476 nfsd4_exchange_id(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3477 union nfsd4_op_u *u)
3478 {
3479 struct nfsd4_exchange_id *exid = &u->exchange_id;
3480 struct nfs4_client *conf, *new;
3481 struct nfs4_client *unconf = NULL;
3482 __be32 status;
3483 char addr_str[INET6_ADDRSTRLEN];
3484 nfs4_verifier verf = exid->verifier;
3485 struct sockaddr *sa = svc_addr(rqstp);
3486 bool update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
3487 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3488
3489 rpc_ntop(sa, addr_str, sizeof(addr_str));
3490 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
3491 "ip_addr=%s flags %x, spa_how %u\n",
3492 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
3493 addr_str, exid->flags, exid->spa_how);
3494
3495 if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
3496 return nfserr_inval;
3497
3498 new = create_client(exid->clname, rqstp, &verf);
3499 if (new == NULL)
3500 return nfserr_jukebox;
3501 status = copy_impl_id(new, exid);
3502 if (status)
3503 goto out_nolock;
3504
3505 switch (exid->spa_how) {
3506 case SP4_MACH_CRED:
3507 exid->spo_must_enforce[0] = 0;
3508 exid->spo_must_enforce[1] = (
3509 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3510 1 << (OP_EXCHANGE_ID - 32) |
3511 1 << (OP_CREATE_SESSION - 32) |
3512 1 << (OP_DESTROY_SESSION - 32) |
3513 1 << (OP_DESTROY_CLIENTID - 32));
3514
3515 exid->spo_must_allow[0] &= (1 << (OP_CLOSE) |
3516 1 << (OP_OPEN_DOWNGRADE) |
3517 1 << (OP_LOCKU) |
3518 1 << (OP_DELEGRETURN));
3519
3520 exid->spo_must_allow[1] &= (
3521 1 << (OP_TEST_STATEID - 32) |
3522 1 << (OP_FREE_STATEID - 32));
3523 if (!svc_rqst_integrity_protected(rqstp)) {
3524 status = nfserr_inval;
3525 goto out_nolock;
3526 }
3527 /*
3528 * Sometimes userspace doesn't give us a principal.
3529 * Which is a bug, really. Anyway, we can't enforce
3530 * MACH_CRED in that case, better to give up now:
3531 */
3532 if (!new->cl_cred.cr_principal &&
3533 !new->cl_cred.cr_raw_principal) {
3534 status = nfserr_serverfault;
3535 goto out_nolock;
3536 }
3537 new->cl_mach_cred = true;
3538 break;
3539 case SP4_NONE:
3540 break;
3541 default: /* checked by xdr code */
3542 WARN_ON_ONCE(1);
3543 fallthrough;
3544 case SP4_SSV:
3545 status = nfserr_encr_alg_unsupp;
3546 goto out_nolock;
3547 }
3548
3549 /* Cases below refer to rfc 5661 section 18.35.4: */
3550 spin_lock(&nn->client_lock);
3551 conf = find_confirmed_client_by_name(&exid->clname, nn);
3552 if (conf) {
3553 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
3554 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
3555
3556 if (update) {
3557 if (!clp_used_exchangeid(conf)) { /* buggy client */
3558 status = nfserr_inval;
3559 goto out;
3560 }
3561 if (!nfsd4_mach_creds_match(conf, rqstp)) {
3562 status = nfserr_wrong_cred;
3563 goto out;
3564 }
3565 if (!creds_match) { /* case 9 */
3566 status = nfserr_perm;
3567 goto out;
3568 }
3569 if (!verfs_match) { /* case 8 */
3570 status = nfserr_not_same;
3571 goto out;
3572 }
3573 /* case 6 */
3574 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
3575 trace_nfsd_clid_confirmed_r(conf);
3576 goto out_copy;
3577 }
3578 if (!creds_match) { /* case 3 */
3579 if (client_has_state(conf)) {
3580 status = nfserr_clid_inuse;
3581 trace_nfsd_clid_cred_mismatch(conf, rqstp);
3582 goto out;
3583 }
3584 goto out_new;
3585 }
3586 if (verfs_match) { /* case 2 */
3587 conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
3588 trace_nfsd_clid_confirmed_r(conf);
3589 goto out_copy;
3590 }
3591 /* case 5, client reboot */
3592 trace_nfsd_clid_verf_mismatch(conf, rqstp, &verf);
3593 conf = NULL;
3594 goto out_new;
3595 }
3596
3597 if (update) { /* case 7 */
3598 status = nfserr_noent;
3599 goto out;
3600 }
3601
3602 unconf = find_unconfirmed_client_by_name(&exid->clname, nn);
3603 if (unconf) /* case 4, possible retry or client restart */
3604 unhash_client_locked(unconf);
3605
3606 /* case 1, new owner ID */
3607 trace_nfsd_clid_fresh(new);
3608
3609 out_new:
3610 if (conf) {
3611 status = mark_client_expired_locked(conf);
3612 if (status)
3613 goto out;
3614 trace_nfsd_clid_replaced(&conf->cl_clientid);
3615 }
3616 new->cl_minorversion = cstate->minorversion;
3617 new->cl_spo_must_allow.u.words[0] = exid->spo_must_allow[0];
3618 new->cl_spo_must_allow.u.words[1] = exid->spo_must_allow[1];
3619
3620 /* Contrived initial CREATE_SESSION response */
3621 new->cl_cs_slot.sl_status = nfserr_seq_misordered;
3622
3623 add_to_unconfirmed(new);
3624 swap(new, conf);
3625 out_copy:
3626 exid->clientid.cl_boot = conf->cl_clientid.cl_boot;
3627 exid->clientid.cl_id = conf->cl_clientid.cl_id;
3628
3629 exid->seqid = conf->cl_cs_slot.sl_seqid + 1;
3630 nfsd4_set_ex_flags(conf, exid);
3631
3632 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
3633 conf->cl_cs_slot.sl_seqid, conf->cl_exchange_flags);
3634 status = nfs_ok;
3635
3636 out:
3637 spin_unlock(&nn->client_lock);
3638 out_nolock:
3639 if (new)
3640 expire_client(new);
3641 if (unconf) {
3642 trace_nfsd_clid_expire_unconf(&unconf->cl_clientid);
3643 expire_client(unconf);
3644 }
3645 return status;
3646 }
3647
check_slot_seqid(u32 seqid,u32 slot_seqid,bool slot_inuse)3648 static __be32 check_slot_seqid(u32 seqid, u32 slot_seqid, bool slot_inuse)
3649 {
3650 /* The slot is in use, and no response has been sent. */
3651 if (slot_inuse) {
3652 if (seqid == slot_seqid)
3653 return nfserr_jukebox;
3654 else
3655 return nfserr_seq_misordered;
3656 }
3657 /* Note unsigned 32-bit arithmetic handles wraparound: */
3658 if (likely(seqid == slot_seqid + 1))
3659 return nfs_ok;
3660 if (seqid == slot_seqid)
3661 return nfserr_replay_cache;
3662 return nfserr_seq_misordered;
3663 }
3664
3665 /*
3666 * Cache the create session result into the create session single DRC
3667 * slot cache by saving the xdr structure. sl_seqid has been set.
3668 * Do this for solo or embedded create session operations.
3669 */
3670 static void
nfsd4_cache_create_session(struct nfsd4_create_session * cr_ses,struct nfsd4_clid_slot * slot,__be32 nfserr)3671 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
3672 struct nfsd4_clid_slot *slot, __be32 nfserr)
3673 {
3674 slot->sl_status = nfserr;
3675 memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
3676 }
3677
3678 static __be32
nfsd4_replay_create_session(struct nfsd4_create_session * cr_ses,struct nfsd4_clid_slot * slot)3679 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
3680 struct nfsd4_clid_slot *slot)
3681 {
3682 memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
3683 return slot->sl_status;
3684 }
3685
3686 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
3687 2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
3688 1 + /* MIN tag is length with zero, only length */ \
3689 3 + /* version, opcount, opcode */ \
3690 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
3691 /* seqid, slotID, slotID, cache */ \
3692 4 ) * sizeof(__be32))
3693
3694 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
3695 2 + /* verifier: AUTH_NULL, length 0 */\
3696 1 + /* status */ \
3697 1 + /* MIN tag is length with zero, only length */ \
3698 3 + /* opcount, opcode, opstatus*/ \
3699 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
3700 /* seqid, slotID, slotID, slotID, status */ \
3701 5 ) * sizeof(__be32))
3702
check_forechannel_attrs(struct nfsd4_channel_attrs * ca,struct nfsd_net * nn)3703 static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
3704 {
3705 u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
3706
3707 if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
3708 return nfserr_toosmall;
3709 if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
3710 return nfserr_toosmall;
3711 ca->headerpadsz = 0;
3712 ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
3713 ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
3714 ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
3715 ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
3716 NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
3717 ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
3718 /*
3719 * Note decreasing slot size below client's request may make it
3720 * difficult for client to function correctly, whereas
3721 * decreasing the number of slots will (just?) affect
3722 * performance. When short on memory we therefore prefer to
3723 * decrease number of slots instead of their size. Clients that
3724 * request larger slots than they need will get poor results:
3725 * Note that we always allow at least one slot, because our
3726 * accounting is soft and provides no guarantees either way.
3727 */
3728 ca->maxreqs = nfsd4_get_drc_mem(ca, nn);
3729
3730 return nfs_ok;
3731 }
3732
3733 /*
3734 * Server's NFSv4.1 backchannel support is AUTH_SYS-only for now.
3735 * These are based on similar macros in linux/sunrpc/msg_prot.h .
3736 */
3737 #define RPC_MAX_HEADER_WITH_AUTH_SYS \
3738 (RPC_CALLHDRSIZE + 2 * (2 + UNX_CALLSLACK))
3739
3740 #define RPC_MAX_REPHEADER_WITH_AUTH_SYS \
3741 (RPC_REPHDRSIZE + (2 + NUL_REPLYSLACK))
3742
3743 #define NFSD_CB_MAX_REQ_SZ ((NFS4_enc_cb_recall_sz + \
3744 RPC_MAX_HEADER_WITH_AUTH_SYS) * sizeof(__be32))
3745 #define NFSD_CB_MAX_RESP_SZ ((NFS4_dec_cb_recall_sz + \
3746 RPC_MAX_REPHEADER_WITH_AUTH_SYS) * \
3747 sizeof(__be32))
3748
check_backchannel_attrs(struct nfsd4_channel_attrs * ca)3749 static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
3750 {
3751 ca->headerpadsz = 0;
3752
3753 if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ)
3754 return nfserr_toosmall;
3755 if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ)
3756 return nfserr_toosmall;
3757 ca->maxresp_cached = 0;
3758 if (ca->maxops < 2)
3759 return nfserr_toosmall;
3760
3761 return nfs_ok;
3762 }
3763
nfsd4_check_cb_sec(struct nfsd4_cb_sec * cbs)3764 static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
3765 {
3766 switch (cbs->flavor) {
3767 case RPC_AUTH_NULL:
3768 case RPC_AUTH_UNIX:
3769 return nfs_ok;
3770 default:
3771 /*
3772 * GSS case: the spec doesn't allow us to return this
3773 * error. But it also doesn't allow us not to support
3774 * GSS.
3775 * I'd rather this fail hard than return some error the
3776 * client might think it can already handle:
3777 */
3778 return nfserr_encr_alg_unsupp;
3779 }
3780 }
3781
3782 __be32
nfsd4_create_session(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)3783 nfsd4_create_session(struct svc_rqst *rqstp,
3784 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
3785 {
3786 struct nfsd4_create_session *cr_ses = &u->create_session;
3787 struct sockaddr *sa = svc_addr(rqstp);
3788 struct nfs4_client *conf, *unconf;
3789 struct nfsd4_clid_slot *cs_slot;
3790 struct nfs4_client *old = NULL;
3791 struct nfsd4_session *new;
3792 struct nfsd4_conn *conn;
3793 __be32 status = 0;
3794 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3795
3796 if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
3797 return nfserr_inval;
3798 status = nfsd4_check_cb_sec(&cr_ses->cb_sec);
3799 if (status)
3800 return status;
3801 status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
3802 if (status)
3803 return status;
3804 status = check_backchannel_attrs(&cr_ses->back_channel);
3805 if (status)
3806 goto out_release_drc_mem;
3807 status = nfserr_jukebox;
3808 new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel);
3809 if (!new)
3810 goto out_release_drc_mem;
3811 conn = alloc_conn_from_crses(rqstp, cr_ses);
3812 if (!conn)
3813 goto out_free_session;
3814
3815 spin_lock(&nn->client_lock);
3816
3817 /* RFC 8881 Section 18.36.4 Phase 1: Client record look-up. */
3818 unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
3819 conf = find_confirmed_client(&cr_ses->clientid, true, nn);
3820 if (!conf && !unconf) {
3821 status = nfserr_stale_clientid;
3822 goto out_free_conn;
3823 }
3824
3825 /* RFC 8881 Section 18.36.4 Phase 2: Sequence ID processing. */
3826 if (conf) {
3827 cs_slot = &conf->cl_cs_slot;
3828 trace_nfsd_slot_seqid_conf(conf, cr_ses);
3829 } else {
3830 cs_slot = &unconf->cl_cs_slot;
3831 trace_nfsd_slot_seqid_unconf(unconf, cr_ses);
3832 }
3833 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
3834 switch (status) {
3835 case nfs_ok:
3836 cs_slot->sl_seqid++;
3837 cr_ses->seqid = cs_slot->sl_seqid;
3838 break;
3839 case nfserr_replay_cache:
3840 status = nfsd4_replay_create_session(cr_ses, cs_slot);
3841 fallthrough;
3842 case nfserr_jukebox:
3843 /* The server MUST NOT cache NFS4ERR_DELAY */
3844 goto out_free_conn;
3845 default:
3846 goto out_cache_error;
3847 }
3848
3849 /* RFC 8881 Section 18.36.4 Phase 3: Client ID confirmation. */
3850 if (conf) {
3851 status = nfserr_wrong_cred;
3852 if (!nfsd4_mach_creds_match(conf, rqstp))
3853 goto out_cache_error;
3854 } else {
3855 status = nfserr_clid_inuse;
3856 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
3857 !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
3858 trace_nfsd_clid_cred_mismatch(unconf, rqstp);
3859 goto out_cache_error;
3860 }
3861 status = nfserr_wrong_cred;
3862 if (!nfsd4_mach_creds_match(unconf, rqstp))
3863 goto out_cache_error;
3864 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
3865 if (old) {
3866 status = mark_client_expired_locked(old);
3867 if (status)
3868 goto out_expired_error;
3869 trace_nfsd_clid_replaced(&old->cl_clientid);
3870 }
3871 move_to_confirmed(unconf);
3872 conf = unconf;
3873 }
3874
3875 /* RFC 8881 Section 18.36.4 Phase 4: Session creation. */
3876 status = nfs_ok;
3877 /* Persistent sessions are not supported */
3878 cr_ses->flags &= ~SESSION4_PERSIST;
3879 /* Upshifting from TCP to RDMA is not supported */
3880 cr_ses->flags &= ~SESSION4_RDMA;
3881
3882 init_session(rqstp, new, conf, cr_ses);
3883 nfsd4_get_session_locked(new);
3884
3885 memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
3886 NFS4_MAX_SESSIONID_LEN);
3887
3888 /* cache solo and embedded create sessions under the client_lock */
3889 nfsd4_cache_create_session(cr_ses, cs_slot, status);
3890 spin_unlock(&nn->client_lock);
3891 if (conf == unconf)
3892 fsnotify_dentry(conf->cl_nfsd_info_dentry, FS_MODIFY);
3893 /* init connection and backchannel */
3894 nfsd4_init_conn(rqstp, conn, new);
3895 nfsd4_put_session(new);
3896 if (old)
3897 expire_client(old);
3898 return status;
3899
3900 out_expired_error:
3901 old = NULL;
3902 /*
3903 * Revert the slot seq_nr change so the server will process
3904 * the client's resend instead of returning a cached response.
3905 */
3906 if (status == nfserr_jukebox) {
3907 cs_slot->sl_seqid--;
3908 cr_ses->seqid = cs_slot->sl_seqid;
3909 goto out_free_conn;
3910 }
3911 out_cache_error:
3912 nfsd4_cache_create_session(cr_ses, cs_slot, status);
3913 out_free_conn:
3914 spin_unlock(&nn->client_lock);
3915 free_conn(conn);
3916 if (old)
3917 expire_client(old);
3918 out_free_session:
3919 __free_session(new);
3920 out_release_drc_mem:
3921 nfsd4_put_drc_mem(&cr_ses->fore_channel);
3922 return status;
3923 }
3924
nfsd4_map_bcts_dir(u32 * dir)3925 static __be32 nfsd4_map_bcts_dir(u32 *dir)
3926 {
3927 switch (*dir) {
3928 case NFS4_CDFC4_FORE:
3929 case NFS4_CDFC4_BACK:
3930 return nfs_ok;
3931 case NFS4_CDFC4_FORE_OR_BOTH:
3932 case NFS4_CDFC4_BACK_OR_BOTH:
3933 *dir = NFS4_CDFC4_BOTH;
3934 return nfs_ok;
3935 }
3936 return nfserr_inval;
3937 }
3938
nfsd4_backchannel_ctl(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)3939 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp,
3940 struct nfsd4_compound_state *cstate,
3941 union nfsd4_op_u *u)
3942 {
3943 struct nfsd4_backchannel_ctl *bc = &u->backchannel_ctl;
3944 struct nfsd4_session *session = cstate->session;
3945 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3946 __be32 status;
3947
3948 status = nfsd4_check_cb_sec(&bc->bc_cb_sec);
3949 if (status)
3950 return status;
3951 spin_lock(&nn->client_lock);
3952 session->se_cb_prog = bc->bc_cb_program;
3953 session->se_cb_sec = bc->bc_cb_sec;
3954 spin_unlock(&nn->client_lock);
3955
3956 nfsd4_probe_callback(session->se_client);
3957
3958 return nfs_ok;
3959 }
3960
__nfsd4_find_conn(struct svc_xprt * xpt,struct nfsd4_session * s)3961 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
3962 {
3963 struct nfsd4_conn *c;
3964
3965 list_for_each_entry(c, &s->se_conns, cn_persession) {
3966 if (c->cn_xprt == xpt) {
3967 return c;
3968 }
3969 }
3970 return NULL;
3971 }
3972
nfsd4_match_existing_connection(struct svc_rqst * rqst,struct nfsd4_session * session,u32 req,struct nfsd4_conn ** conn)3973 static __be32 nfsd4_match_existing_connection(struct svc_rqst *rqst,
3974 struct nfsd4_session *session, u32 req, struct nfsd4_conn **conn)
3975 {
3976 struct nfs4_client *clp = session->se_client;
3977 struct svc_xprt *xpt = rqst->rq_xprt;
3978 struct nfsd4_conn *c;
3979 __be32 status;
3980
3981 /* Following the last paragraph of RFC 5661 Section 18.34.3: */
3982 spin_lock(&clp->cl_lock);
3983 c = __nfsd4_find_conn(xpt, session);
3984 if (!c)
3985 status = nfserr_noent;
3986 else if (req == c->cn_flags)
3987 status = nfs_ok;
3988 else if (req == NFS4_CDFC4_FORE_OR_BOTH &&
3989 c->cn_flags != NFS4_CDFC4_BACK)
3990 status = nfs_ok;
3991 else if (req == NFS4_CDFC4_BACK_OR_BOTH &&
3992 c->cn_flags != NFS4_CDFC4_FORE)
3993 status = nfs_ok;
3994 else
3995 status = nfserr_inval;
3996 spin_unlock(&clp->cl_lock);
3997 if (status == nfs_ok && conn)
3998 *conn = c;
3999 return status;
4000 }
4001
nfsd4_bind_conn_to_session(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)4002 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
4003 struct nfsd4_compound_state *cstate,
4004 union nfsd4_op_u *u)
4005 {
4006 struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
4007 __be32 status;
4008 struct nfsd4_conn *conn;
4009 struct nfsd4_session *session;
4010 struct net *net = SVC_NET(rqstp);
4011 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4012
4013 if (!nfsd4_last_compound_op(rqstp))
4014 return nfserr_not_only_op;
4015 spin_lock(&nn->client_lock);
4016 session = find_in_sessionid_hashtbl(&bcts->sessionid, net, &status);
4017 spin_unlock(&nn->client_lock);
4018 if (!session)
4019 goto out_no_session;
4020 status = nfserr_wrong_cred;
4021 if (!nfsd4_mach_creds_match(session->se_client, rqstp))
4022 goto out;
4023 status = nfsd4_match_existing_connection(rqstp, session,
4024 bcts->dir, &conn);
4025 if (status == nfs_ok) {
4026 if (bcts->dir == NFS4_CDFC4_FORE_OR_BOTH ||
4027 bcts->dir == NFS4_CDFC4_BACK)
4028 conn->cn_flags |= NFS4_CDFC4_BACK;
4029 nfsd4_probe_callback(session->se_client);
4030 goto out;
4031 }
4032 if (status == nfserr_inval)
4033 goto out;
4034 status = nfsd4_map_bcts_dir(&bcts->dir);
4035 if (status)
4036 goto out;
4037 conn = alloc_conn(rqstp, bcts->dir);
4038 status = nfserr_jukebox;
4039 if (!conn)
4040 goto out;
4041 nfsd4_init_conn(rqstp, conn, session);
4042 status = nfs_ok;
4043 out:
4044 nfsd4_put_session(session);
4045 out_no_session:
4046 return status;
4047 }
4048
nfsd4_compound_in_session(struct nfsd4_compound_state * cstate,struct nfs4_sessionid * sid)4049 static bool nfsd4_compound_in_session(struct nfsd4_compound_state *cstate, struct nfs4_sessionid *sid)
4050 {
4051 if (!cstate->session)
4052 return false;
4053 return !memcmp(sid, &cstate->session->se_sessionid, sizeof(*sid));
4054 }
4055
4056 __be32
nfsd4_destroy_session(struct svc_rqst * r,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)4057 nfsd4_destroy_session(struct svc_rqst *r, struct nfsd4_compound_state *cstate,
4058 union nfsd4_op_u *u)
4059 {
4060 struct nfs4_sessionid *sessionid = &u->destroy_session.sessionid;
4061 struct nfsd4_session *ses;
4062 __be32 status;
4063 int ref_held_by_me = 0;
4064 struct net *net = SVC_NET(r);
4065 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4066
4067 status = nfserr_not_only_op;
4068 if (nfsd4_compound_in_session(cstate, sessionid)) {
4069 if (!nfsd4_last_compound_op(r))
4070 goto out;
4071 ref_held_by_me++;
4072 }
4073 dump_sessionid(__func__, sessionid);
4074 spin_lock(&nn->client_lock);
4075 ses = find_in_sessionid_hashtbl(sessionid, net, &status);
4076 if (!ses)
4077 goto out_client_lock;
4078 status = nfserr_wrong_cred;
4079 if (!nfsd4_mach_creds_match(ses->se_client, r))
4080 goto out_put_session;
4081 status = mark_session_dead_locked(ses, 1 + ref_held_by_me);
4082 if (status)
4083 goto out_put_session;
4084 unhash_session(ses);
4085 spin_unlock(&nn->client_lock);
4086
4087 nfsd4_probe_callback_sync(ses->se_client);
4088
4089 spin_lock(&nn->client_lock);
4090 status = nfs_ok;
4091 out_put_session:
4092 nfsd4_put_session_locked(ses);
4093 out_client_lock:
4094 spin_unlock(&nn->client_lock);
4095 out:
4096 return status;
4097 }
4098
nfsd4_sequence_check_conn(struct nfsd4_conn * new,struct nfsd4_session * ses)4099 static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
4100 {
4101 struct nfs4_client *clp = ses->se_client;
4102 struct nfsd4_conn *c;
4103 __be32 status = nfs_ok;
4104 int ret;
4105
4106 spin_lock(&clp->cl_lock);
4107 c = __nfsd4_find_conn(new->cn_xprt, ses);
4108 if (c)
4109 goto out_free;
4110 status = nfserr_conn_not_bound_to_session;
4111 if (clp->cl_mach_cred)
4112 goto out_free;
4113 __nfsd4_hash_conn(new, ses);
4114 spin_unlock(&clp->cl_lock);
4115 ret = nfsd4_register_conn(new);
4116 if (ret)
4117 /* oops; xprt is already down: */
4118 nfsd4_conn_lost(&new->cn_xpt_user);
4119 return nfs_ok;
4120 out_free:
4121 spin_unlock(&clp->cl_lock);
4122 free_conn(new);
4123 return status;
4124 }
4125
nfsd4_session_too_many_ops(struct svc_rqst * rqstp,struct nfsd4_session * session)4126 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
4127 {
4128 struct nfsd4_compoundargs *args = rqstp->rq_argp;
4129
4130 return args->opcnt > session->se_fchannel.maxops;
4131 }
4132
nfsd4_request_too_big(struct svc_rqst * rqstp,struct nfsd4_session * session)4133 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
4134 struct nfsd4_session *session)
4135 {
4136 struct xdr_buf *xb = &rqstp->rq_arg;
4137
4138 return xb->len > session->se_fchannel.maxreq_sz;
4139 }
4140
replay_matches_cache(struct svc_rqst * rqstp,struct nfsd4_sequence * seq,struct nfsd4_slot * slot)4141 static bool replay_matches_cache(struct svc_rqst *rqstp,
4142 struct nfsd4_sequence *seq, struct nfsd4_slot *slot)
4143 {
4144 struct nfsd4_compoundargs *argp = rqstp->rq_argp;
4145
4146 if ((bool)(slot->sl_flags & NFSD4_SLOT_CACHETHIS) !=
4147 (bool)seq->cachethis)
4148 return false;
4149 /*
4150 * If there's an error then the reply can have fewer ops than
4151 * the call.
4152 */
4153 if (slot->sl_opcnt < argp->opcnt && !slot->sl_status)
4154 return false;
4155 /*
4156 * But if we cached a reply with *more* ops than the call you're
4157 * sending us now, then this new call is clearly not really a
4158 * replay of the old one:
4159 */
4160 if (slot->sl_opcnt > argp->opcnt)
4161 return false;
4162 /* This is the only check explicitly called by spec: */
4163 if (!same_creds(&rqstp->rq_cred, &slot->sl_cred))
4164 return false;
4165 /*
4166 * There may be more comparisons we could actually do, but the
4167 * spec doesn't require us to catch every case where the calls
4168 * don't match (that would require caching the call as well as
4169 * the reply), so we don't bother.
4170 */
4171 return true;
4172 }
4173
4174 __be32
nfsd4_sequence(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)4175 nfsd4_sequence(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4176 union nfsd4_op_u *u)
4177 {
4178 struct nfsd4_sequence *seq = &u->sequence;
4179 struct nfsd4_compoundres *resp = rqstp->rq_resp;
4180 struct xdr_stream *xdr = resp->xdr;
4181 struct nfsd4_session *session;
4182 struct nfs4_client *clp;
4183 struct nfsd4_slot *slot;
4184 struct nfsd4_conn *conn;
4185 __be32 status;
4186 int buflen;
4187 struct net *net = SVC_NET(rqstp);
4188 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4189
4190 if (resp->opcnt != 1)
4191 return nfserr_sequence_pos;
4192
4193 /*
4194 * Will be either used or freed by nfsd4_sequence_check_conn
4195 * below.
4196 */
4197 conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
4198 if (!conn)
4199 return nfserr_jukebox;
4200
4201 spin_lock(&nn->client_lock);
4202 session = find_in_sessionid_hashtbl(&seq->sessionid, net, &status);
4203 if (!session)
4204 goto out_no_session;
4205 clp = session->se_client;
4206
4207 status = nfserr_too_many_ops;
4208 if (nfsd4_session_too_many_ops(rqstp, session))
4209 goto out_put_session;
4210
4211 status = nfserr_req_too_big;
4212 if (nfsd4_request_too_big(rqstp, session))
4213 goto out_put_session;
4214
4215 status = nfserr_badslot;
4216 if (seq->slotid >= session->se_fchannel.maxreqs)
4217 goto out_put_session;
4218
4219 slot = session->se_slots[seq->slotid];
4220 dprintk("%s: slotid %d\n", __func__, seq->slotid);
4221
4222 /* We do not negotiate the number of slots yet, so set the
4223 * maxslots to the session maxreqs which is used to encode
4224 * sr_highest_slotid and the sr_target_slot id to maxslots */
4225 seq->maxslots = session->se_fchannel.maxreqs;
4226
4227 trace_nfsd_slot_seqid_sequence(clp, seq, slot);
4228 status = check_slot_seqid(seq->seqid, slot->sl_seqid,
4229 slot->sl_flags & NFSD4_SLOT_INUSE);
4230 if (status == nfserr_replay_cache) {
4231 status = nfserr_seq_misordered;
4232 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
4233 goto out_put_session;
4234 status = nfserr_seq_false_retry;
4235 if (!replay_matches_cache(rqstp, seq, slot))
4236 goto out_put_session;
4237 cstate->slot = slot;
4238 cstate->session = session;
4239 cstate->clp = clp;
4240 /* Return the cached reply status and set cstate->status
4241 * for nfsd4_proc_compound processing */
4242 status = nfsd4_replay_cache_entry(resp, seq);
4243 cstate->status = nfserr_replay_cache;
4244 goto out;
4245 }
4246 if (status)
4247 goto out_put_session;
4248
4249 status = nfsd4_sequence_check_conn(conn, session);
4250 conn = NULL;
4251 if (status)
4252 goto out_put_session;
4253
4254 buflen = (seq->cachethis) ?
4255 session->se_fchannel.maxresp_cached :
4256 session->se_fchannel.maxresp_sz;
4257 status = (seq->cachethis) ? nfserr_rep_too_big_to_cache :
4258 nfserr_rep_too_big;
4259 if (xdr_restrict_buflen(xdr, buflen - rqstp->rq_auth_slack))
4260 goto out_put_session;
4261 svc_reserve(rqstp, buflen);
4262
4263 status = nfs_ok;
4264 /* Success! bump slot seqid */
4265 slot->sl_seqid = seq->seqid;
4266 slot->sl_flags |= NFSD4_SLOT_INUSE;
4267 if (seq->cachethis)
4268 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
4269 else
4270 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
4271
4272 cstate->slot = slot;
4273 cstate->session = session;
4274 cstate->clp = clp;
4275
4276 out:
4277 switch (clp->cl_cb_state) {
4278 case NFSD4_CB_DOWN:
4279 seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
4280 break;
4281 case NFSD4_CB_FAULT:
4282 seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
4283 break;
4284 default:
4285 seq->status_flags = 0;
4286 }
4287 if (!list_empty(&clp->cl_revoked))
4288 seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
4289 if (atomic_read(&clp->cl_admin_revoked))
4290 seq->status_flags |= SEQ4_STATUS_ADMIN_STATE_REVOKED;
4291 trace_nfsd_seq4_status(rqstp, seq);
4292 out_no_session:
4293 if (conn)
4294 free_conn(conn);
4295 spin_unlock(&nn->client_lock);
4296 return status;
4297 out_put_session:
4298 nfsd4_put_session_locked(session);
4299 goto out_no_session;
4300 }
4301
4302 void
nfsd4_sequence_done(struct nfsd4_compoundres * resp)4303 nfsd4_sequence_done(struct nfsd4_compoundres *resp)
4304 {
4305 struct nfsd4_compound_state *cs = &resp->cstate;
4306
4307 if (nfsd4_has_session(cs)) {
4308 if (cs->status != nfserr_replay_cache) {
4309 nfsd4_store_cache_entry(resp);
4310 cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
4311 }
4312 /* Drop session reference that was taken in nfsd4_sequence() */
4313 nfsd4_put_session(cs->session);
4314 } else if (cs->clp)
4315 put_client_renew(cs->clp);
4316 }
4317
4318 __be32
nfsd4_destroy_clientid(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)4319 nfsd4_destroy_clientid(struct svc_rqst *rqstp,
4320 struct nfsd4_compound_state *cstate,
4321 union nfsd4_op_u *u)
4322 {
4323 struct nfsd4_destroy_clientid *dc = &u->destroy_clientid;
4324 struct nfs4_client *conf, *unconf;
4325 struct nfs4_client *clp = NULL;
4326 __be32 status = 0;
4327 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4328
4329 spin_lock(&nn->client_lock);
4330 unconf = find_unconfirmed_client(&dc->clientid, true, nn);
4331 conf = find_confirmed_client(&dc->clientid, true, nn);
4332 WARN_ON_ONCE(conf && unconf);
4333
4334 if (conf) {
4335 if (client_has_state(conf)) {
4336 status = nfserr_clientid_busy;
4337 goto out;
4338 }
4339 status = mark_client_expired_locked(conf);
4340 if (status)
4341 goto out;
4342 clp = conf;
4343 } else if (unconf)
4344 clp = unconf;
4345 else {
4346 status = nfserr_stale_clientid;
4347 goto out;
4348 }
4349 if (!nfsd4_mach_creds_match(clp, rqstp)) {
4350 clp = NULL;
4351 status = nfserr_wrong_cred;
4352 goto out;
4353 }
4354 trace_nfsd_clid_destroyed(&clp->cl_clientid);
4355 unhash_client_locked(clp);
4356 out:
4357 spin_unlock(&nn->client_lock);
4358 if (clp)
4359 expire_client(clp);
4360 return status;
4361 }
4362
4363 __be32
nfsd4_reclaim_complete(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)4364 nfsd4_reclaim_complete(struct svc_rqst *rqstp,
4365 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
4366 {
4367 struct nfsd4_reclaim_complete *rc = &u->reclaim_complete;
4368 struct nfs4_client *clp = cstate->clp;
4369 __be32 status = 0;
4370
4371 if (rc->rca_one_fs) {
4372 if (!cstate->current_fh.fh_dentry)
4373 return nfserr_nofilehandle;
4374 /*
4375 * We don't take advantage of the rca_one_fs case.
4376 * That's OK, it's optional, we can safely ignore it.
4377 */
4378 return nfs_ok;
4379 }
4380
4381 status = nfserr_complete_already;
4382 if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &clp->cl_flags))
4383 goto out;
4384
4385 status = nfserr_stale_clientid;
4386 if (is_client_expired(clp))
4387 /*
4388 * The following error isn't really legal.
4389 * But we only get here if the client just explicitly
4390 * destroyed the client. Surely it no longer cares what
4391 * error it gets back on an operation for the dead
4392 * client.
4393 */
4394 goto out;
4395
4396 status = nfs_ok;
4397 trace_nfsd_clid_reclaim_complete(&clp->cl_clientid);
4398 nfsd4_client_record_create(clp);
4399 inc_reclaim_complete(clp);
4400 out:
4401 return status;
4402 }
4403
4404 __be32
nfsd4_setclientid(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)4405 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4406 union nfsd4_op_u *u)
4407 {
4408 struct nfsd4_setclientid *setclid = &u->setclientid;
4409 struct xdr_netobj clname = setclid->se_name;
4410 nfs4_verifier clverifier = setclid->se_verf;
4411 struct nfs4_client *conf, *new;
4412 struct nfs4_client *unconf = NULL;
4413 __be32 status;
4414 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4415
4416 new = create_client(clname, rqstp, &clverifier);
4417 if (new == NULL)
4418 return nfserr_jukebox;
4419 spin_lock(&nn->client_lock);
4420 conf = find_confirmed_client_by_name(&clname, nn);
4421 if (conf && client_has_state(conf)) {
4422 status = nfserr_clid_inuse;
4423 if (clp_used_exchangeid(conf))
4424 goto out;
4425 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
4426 trace_nfsd_clid_cred_mismatch(conf, rqstp);
4427 goto out;
4428 }
4429 }
4430 unconf = find_unconfirmed_client_by_name(&clname, nn);
4431 if (unconf)
4432 unhash_client_locked(unconf);
4433 if (conf) {
4434 if (same_verf(&conf->cl_verifier, &clverifier)) {
4435 copy_clid(new, conf);
4436 gen_confirm(new, nn);
4437 } else
4438 trace_nfsd_clid_verf_mismatch(conf, rqstp,
4439 &clverifier);
4440 } else
4441 trace_nfsd_clid_fresh(new);
4442 new->cl_minorversion = 0;
4443 gen_callback(new, setclid, rqstp);
4444 add_to_unconfirmed(new);
4445 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
4446 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
4447 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
4448 new = NULL;
4449 status = nfs_ok;
4450 out:
4451 spin_unlock(&nn->client_lock);
4452 if (new)
4453 free_client(new);
4454 if (unconf) {
4455 trace_nfsd_clid_expire_unconf(&unconf->cl_clientid);
4456 expire_client(unconf);
4457 }
4458 return status;
4459 }
4460
4461 __be32
nfsd4_setclientid_confirm(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)4462 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
4463 struct nfsd4_compound_state *cstate,
4464 union nfsd4_op_u *u)
4465 {
4466 struct nfsd4_setclientid_confirm *setclientid_confirm =
4467 &u->setclientid_confirm;
4468 struct nfs4_client *conf, *unconf;
4469 struct nfs4_client *old = NULL;
4470 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
4471 clientid_t * clid = &setclientid_confirm->sc_clientid;
4472 __be32 status;
4473 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4474
4475 if (STALE_CLIENTID(clid, nn))
4476 return nfserr_stale_clientid;
4477
4478 spin_lock(&nn->client_lock);
4479 conf = find_confirmed_client(clid, false, nn);
4480 unconf = find_unconfirmed_client(clid, false, nn);
4481 /*
4482 * We try hard to give out unique clientid's, so if we get an
4483 * attempt to confirm the same clientid with a different cred,
4484 * the client may be buggy; this should never happen.
4485 *
4486 * Nevertheless, RFC 7530 recommends INUSE for this case:
4487 */
4488 status = nfserr_clid_inuse;
4489 if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
4490 trace_nfsd_clid_cred_mismatch(unconf, rqstp);
4491 goto out;
4492 }
4493 if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
4494 trace_nfsd_clid_cred_mismatch(conf, rqstp);
4495 goto out;
4496 }
4497 if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
4498 if (conf && same_verf(&confirm, &conf->cl_confirm)) {
4499 status = nfs_ok;
4500 } else
4501 status = nfserr_stale_clientid;
4502 goto out;
4503 }
4504 status = nfs_ok;
4505 if (conf) {
4506 old = unconf;
4507 unhash_client_locked(old);
4508 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
4509 } else {
4510 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
4511 if (old) {
4512 status = nfserr_clid_inuse;
4513 if (client_has_state(old)
4514 && !same_creds(&unconf->cl_cred,
4515 &old->cl_cred)) {
4516 old = NULL;
4517 goto out;
4518 }
4519 status = mark_client_expired_locked(old);
4520 if (status) {
4521 old = NULL;
4522 goto out;
4523 }
4524 trace_nfsd_clid_replaced(&old->cl_clientid);
4525 }
4526 move_to_confirmed(unconf);
4527 conf = unconf;
4528 }
4529 get_client_locked(conf);
4530 spin_unlock(&nn->client_lock);
4531 if (conf == unconf)
4532 fsnotify_dentry(conf->cl_nfsd_info_dentry, FS_MODIFY);
4533 nfsd4_probe_callback(conf);
4534 spin_lock(&nn->client_lock);
4535 put_client_renew_locked(conf);
4536 out:
4537 spin_unlock(&nn->client_lock);
4538 if (old)
4539 expire_client(old);
4540 return status;
4541 }
4542
nfsd4_alloc_file(void)4543 static struct nfs4_file *nfsd4_alloc_file(void)
4544 {
4545 return kmem_cache_alloc(file_slab, GFP_KERNEL);
4546 }
4547
4548 /* OPEN Share state helper functions */
4549
nfsd4_file_init(const struct svc_fh * fh,struct nfs4_file * fp)4550 static void nfsd4_file_init(const struct svc_fh *fh, struct nfs4_file *fp)
4551 {
4552 refcount_set(&fp->fi_ref, 1);
4553 spin_lock_init(&fp->fi_lock);
4554 INIT_LIST_HEAD(&fp->fi_stateids);
4555 INIT_LIST_HEAD(&fp->fi_delegations);
4556 INIT_LIST_HEAD(&fp->fi_clnt_odstate);
4557 fh_copy_shallow(&fp->fi_fhandle, &fh->fh_handle);
4558 fp->fi_deleg_file = NULL;
4559 fp->fi_had_conflict = false;
4560 fp->fi_share_deny = 0;
4561 memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
4562 memset(fp->fi_access, 0, sizeof(fp->fi_access));
4563 fp->fi_aliased = false;
4564 fp->fi_inode = d_inode(fh->fh_dentry);
4565 #ifdef CONFIG_NFSD_PNFS
4566 INIT_LIST_HEAD(&fp->fi_lo_states);
4567 atomic_set(&fp->fi_lo_recalls, 0);
4568 #endif
4569 }
4570
4571 void
nfsd4_free_slabs(void)4572 nfsd4_free_slabs(void)
4573 {
4574 kmem_cache_destroy(client_slab);
4575 kmem_cache_destroy(openowner_slab);
4576 kmem_cache_destroy(lockowner_slab);
4577 kmem_cache_destroy(file_slab);
4578 kmem_cache_destroy(stateid_slab);
4579 kmem_cache_destroy(deleg_slab);
4580 kmem_cache_destroy(odstate_slab);
4581 }
4582
4583 int
nfsd4_init_slabs(void)4584 nfsd4_init_slabs(void)
4585 {
4586 client_slab = KMEM_CACHE(nfs4_client, 0);
4587 if (client_slab == NULL)
4588 goto out;
4589 openowner_slab = KMEM_CACHE(nfs4_openowner, 0);
4590 if (openowner_slab == NULL)
4591 goto out_free_client_slab;
4592 lockowner_slab = KMEM_CACHE(nfs4_lockowner, 0);
4593 if (lockowner_slab == NULL)
4594 goto out_free_openowner_slab;
4595 file_slab = KMEM_CACHE(nfs4_file, 0);
4596 if (file_slab == NULL)
4597 goto out_free_lockowner_slab;
4598 stateid_slab = KMEM_CACHE(nfs4_ol_stateid, 0);
4599 if (stateid_slab == NULL)
4600 goto out_free_file_slab;
4601 deleg_slab = KMEM_CACHE(nfs4_delegation, 0);
4602 if (deleg_slab == NULL)
4603 goto out_free_stateid_slab;
4604 odstate_slab = KMEM_CACHE(nfs4_clnt_odstate, 0);
4605 if (odstate_slab == NULL)
4606 goto out_free_deleg_slab;
4607 return 0;
4608
4609 out_free_deleg_slab:
4610 kmem_cache_destroy(deleg_slab);
4611 out_free_stateid_slab:
4612 kmem_cache_destroy(stateid_slab);
4613 out_free_file_slab:
4614 kmem_cache_destroy(file_slab);
4615 out_free_lockowner_slab:
4616 kmem_cache_destroy(lockowner_slab);
4617 out_free_openowner_slab:
4618 kmem_cache_destroy(openowner_slab);
4619 out_free_client_slab:
4620 kmem_cache_destroy(client_slab);
4621 out:
4622 return -ENOMEM;
4623 }
4624
4625 static unsigned long
nfsd4_state_shrinker_count(struct shrinker * shrink,struct shrink_control * sc)4626 nfsd4_state_shrinker_count(struct shrinker *shrink, struct shrink_control *sc)
4627 {
4628 int count;
4629 struct nfsd_net *nn = shrink->private_data;
4630
4631 count = atomic_read(&nn->nfsd_courtesy_clients);
4632 if (!count)
4633 count = atomic_long_read(&num_delegations);
4634 if (count)
4635 queue_work(laundry_wq, &nn->nfsd_shrinker_work);
4636 return (unsigned long)count;
4637 }
4638
4639 static unsigned long
nfsd4_state_shrinker_scan(struct shrinker * shrink,struct shrink_control * sc)4640 nfsd4_state_shrinker_scan(struct shrinker *shrink, struct shrink_control *sc)
4641 {
4642 return SHRINK_STOP;
4643 }
4644
4645 void
nfsd4_init_leases_net(struct nfsd_net * nn)4646 nfsd4_init_leases_net(struct nfsd_net *nn)
4647 {
4648 struct sysinfo si;
4649 u64 max_clients;
4650
4651 nn->nfsd4_lease = 90; /* default lease time */
4652 nn->nfsd4_grace = 90;
4653 nn->somebody_reclaimed = false;
4654 nn->track_reclaim_completes = false;
4655 nn->clverifier_counter = get_random_u32();
4656 nn->clientid_base = get_random_u32();
4657 nn->clientid_counter = nn->clientid_base + 1;
4658 nn->s2s_cp_cl_id = nn->clientid_counter++;
4659
4660 atomic_set(&nn->nfs4_client_count, 0);
4661 si_meminfo(&si);
4662 max_clients = (u64)si.totalram * si.mem_unit / (1024 * 1024 * 1024);
4663 max_clients *= NFS4_CLIENTS_PER_GB;
4664 nn->nfs4_max_clients = max_t(int, max_clients, NFS4_CLIENTS_PER_GB);
4665
4666 atomic_set(&nn->nfsd_courtesy_clients, 0);
4667 }
4668
4669 enum rp_lock {
4670 RP_UNLOCKED,
4671 RP_LOCKED,
4672 RP_UNHASHED,
4673 };
4674
init_nfs4_replay(struct nfs4_replay * rp)4675 static void init_nfs4_replay(struct nfs4_replay *rp)
4676 {
4677 rp->rp_status = nfserr_serverfault;
4678 rp->rp_buflen = 0;
4679 rp->rp_buf = rp->rp_ibuf;
4680 atomic_set(&rp->rp_locked, RP_UNLOCKED);
4681 }
4682
nfsd4_cstate_assign_replay(struct nfsd4_compound_state * cstate,struct nfs4_stateowner * so)4683 static int nfsd4_cstate_assign_replay(struct nfsd4_compound_state *cstate,
4684 struct nfs4_stateowner *so)
4685 {
4686 if (!nfsd4_has_session(cstate)) {
4687 wait_var_event(&so->so_replay.rp_locked,
4688 atomic_cmpxchg(&so->so_replay.rp_locked,
4689 RP_UNLOCKED, RP_LOCKED) != RP_LOCKED);
4690 if (atomic_read(&so->so_replay.rp_locked) == RP_UNHASHED)
4691 return -EAGAIN;
4692 cstate->replay_owner = nfs4_get_stateowner(so);
4693 }
4694 return 0;
4695 }
4696
nfsd4_cstate_clear_replay(struct nfsd4_compound_state * cstate)4697 void nfsd4_cstate_clear_replay(struct nfsd4_compound_state *cstate)
4698 {
4699 struct nfs4_stateowner *so = cstate->replay_owner;
4700
4701 if (so != NULL) {
4702 cstate->replay_owner = NULL;
4703 atomic_set(&so->so_replay.rp_locked, RP_UNLOCKED);
4704 wake_up_var(&so->so_replay.rp_locked);
4705 nfs4_put_stateowner(so);
4706 }
4707 }
4708
alloc_stateowner(struct kmem_cache * slab,struct xdr_netobj * owner,struct nfs4_client * clp)4709 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
4710 {
4711 struct nfs4_stateowner *sop;
4712
4713 sop = kmem_cache_alloc(slab, GFP_KERNEL);
4714 if (!sop)
4715 return NULL;
4716
4717 xdr_netobj_dup(&sop->so_owner, owner, GFP_KERNEL);
4718 if (!sop->so_owner.data) {
4719 kmem_cache_free(slab, sop);
4720 return NULL;
4721 }
4722
4723 INIT_LIST_HEAD(&sop->so_stateids);
4724 sop->so_client = clp;
4725 init_nfs4_replay(&sop->so_replay);
4726 atomic_set(&sop->so_count, 1);
4727 return sop;
4728 }
4729
hash_openowner(struct nfs4_openowner * oo,struct nfs4_client * clp,unsigned int strhashval)4730 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
4731 {
4732 lockdep_assert_held(&clp->cl_lock);
4733
4734 list_add(&oo->oo_owner.so_strhash,
4735 &clp->cl_ownerstr_hashtbl[strhashval]);
4736 list_add(&oo->oo_perclient, &clp->cl_openowners);
4737 }
4738
nfs4_unhash_openowner(struct nfs4_stateowner * so)4739 static void nfs4_unhash_openowner(struct nfs4_stateowner *so)
4740 {
4741 unhash_openowner_locked(openowner(so));
4742 }
4743
nfs4_free_openowner(struct nfs4_stateowner * so)4744 static void nfs4_free_openowner(struct nfs4_stateowner *so)
4745 {
4746 struct nfs4_openowner *oo = openowner(so);
4747
4748 kmem_cache_free(openowner_slab, oo);
4749 }
4750
4751 static const struct nfs4_stateowner_operations openowner_ops = {
4752 .so_unhash = nfs4_unhash_openowner,
4753 .so_free = nfs4_free_openowner,
4754 };
4755
4756 static struct nfs4_ol_stateid *
nfsd4_find_existing_open(struct nfs4_file * fp,struct nfsd4_open * open)4757 nfsd4_find_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
4758 {
4759 struct nfs4_ol_stateid *local, *ret = NULL;
4760 struct nfs4_openowner *oo = open->op_openowner;
4761
4762 lockdep_assert_held(&fp->fi_lock);
4763
4764 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
4765 /* ignore lock owners */
4766 if (local->st_stateowner->so_is_open_owner == 0)
4767 continue;
4768 if (local->st_stateowner != &oo->oo_owner)
4769 continue;
4770 if (local->st_stid.sc_type == SC_TYPE_OPEN &&
4771 !local->st_stid.sc_status) {
4772 ret = local;
4773 refcount_inc(&ret->st_stid.sc_count);
4774 break;
4775 }
4776 }
4777 return ret;
4778 }
4779
nfsd4_drop_revoked_stid(struct nfs4_stid * s)4780 static void nfsd4_drop_revoked_stid(struct nfs4_stid *s)
4781 __releases(&s->sc_client->cl_lock)
4782 {
4783 struct nfs4_client *cl = s->sc_client;
4784 LIST_HEAD(reaplist);
4785 struct nfs4_ol_stateid *stp;
4786 struct nfs4_delegation *dp;
4787 bool unhashed;
4788
4789 switch (s->sc_type) {
4790 case SC_TYPE_OPEN:
4791 stp = openlockstateid(s);
4792 if (unhash_open_stateid(stp, &reaplist))
4793 put_ol_stateid_locked(stp, &reaplist);
4794 spin_unlock(&cl->cl_lock);
4795 free_ol_stateid_reaplist(&reaplist);
4796 break;
4797 case SC_TYPE_LOCK:
4798 stp = openlockstateid(s);
4799 unhashed = unhash_lock_stateid(stp);
4800 spin_unlock(&cl->cl_lock);
4801 if (unhashed)
4802 nfs4_put_stid(s);
4803 break;
4804 case SC_TYPE_DELEG:
4805 dp = delegstateid(s);
4806 list_del_init(&dp->dl_recall_lru);
4807 spin_unlock(&cl->cl_lock);
4808 nfs4_put_stid(s);
4809 break;
4810 default:
4811 spin_unlock(&cl->cl_lock);
4812 }
4813 }
4814
nfsd40_drop_revoked_stid(struct nfs4_client * cl,stateid_t * stid)4815 static void nfsd40_drop_revoked_stid(struct nfs4_client *cl,
4816 stateid_t *stid)
4817 {
4818 /* NFSv4.0 has no way for the client to tell the server
4819 * that it can forget an admin-revoked stateid.
4820 * So we keep it around until the first time that the
4821 * client uses it, and drop it the first time
4822 * nfserr_admin_revoked is returned.
4823 * For v4.1 and later we wait until explicitly told
4824 * to free the stateid.
4825 */
4826 if (cl->cl_minorversion == 0) {
4827 struct nfs4_stid *st;
4828
4829 spin_lock(&cl->cl_lock);
4830 st = find_stateid_locked(cl, stid);
4831 if (st)
4832 nfsd4_drop_revoked_stid(st);
4833 else
4834 spin_unlock(&cl->cl_lock);
4835 }
4836 }
4837
4838 static __be32
nfsd4_verify_open_stid(struct nfs4_stid * s)4839 nfsd4_verify_open_stid(struct nfs4_stid *s)
4840 {
4841 __be32 ret = nfs_ok;
4842
4843 if (s->sc_status & SC_STATUS_ADMIN_REVOKED)
4844 ret = nfserr_admin_revoked;
4845 else if (s->sc_status & SC_STATUS_REVOKED)
4846 ret = nfserr_deleg_revoked;
4847 else if (s->sc_status & SC_STATUS_CLOSED)
4848 ret = nfserr_bad_stateid;
4849 return ret;
4850 }
4851
4852 /* Lock the stateid st_mutex, and deal with races with CLOSE */
4853 static __be32
nfsd4_lock_ol_stateid(struct nfs4_ol_stateid * stp)4854 nfsd4_lock_ol_stateid(struct nfs4_ol_stateid *stp)
4855 {
4856 __be32 ret;
4857
4858 mutex_lock_nested(&stp->st_mutex, LOCK_STATEID_MUTEX);
4859 ret = nfsd4_verify_open_stid(&stp->st_stid);
4860 if (ret == nfserr_admin_revoked)
4861 nfsd40_drop_revoked_stid(stp->st_stid.sc_client,
4862 &stp->st_stid.sc_stateid);
4863
4864 if (ret != nfs_ok)
4865 mutex_unlock(&stp->st_mutex);
4866 return ret;
4867 }
4868
4869 static struct nfs4_ol_stateid *
nfsd4_find_and_lock_existing_open(struct nfs4_file * fp,struct nfsd4_open * open)4870 nfsd4_find_and_lock_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
4871 {
4872 struct nfs4_ol_stateid *stp;
4873 for (;;) {
4874 spin_lock(&fp->fi_lock);
4875 stp = nfsd4_find_existing_open(fp, open);
4876 spin_unlock(&fp->fi_lock);
4877 if (!stp || nfsd4_lock_ol_stateid(stp) == nfs_ok)
4878 break;
4879 nfs4_put_stid(&stp->st_stid);
4880 }
4881 return stp;
4882 }
4883
4884 static struct nfs4_openowner *
find_or_alloc_open_stateowner(unsigned int strhashval,struct nfsd4_open * open,struct nfsd4_compound_state * cstate)4885 find_or_alloc_open_stateowner(unsigned int strhashval, struct nfsd4_open *open,
4886 struct nfsd4_compound_state *cstate)
4887 {
4888 struct nfs4_client *clp = cstate->clp;
4889 struct nfs4_openowner *oo, *new = NULL;
4890
4891 retry:
4892 spin_lock(&clp->cl_lock);
4893 oo = find_openstateowner_str(strhashval, open, clp);
4894 if (!oo && new) {
4895 hash_openowner(new, clp, strhashval);
4896 spin_unlock(&clp->cl_lock);
4897 return new;
4898 }
4899 spin_unlock(&clp->cl_lock);
4900
4901 if (oo && !(oo->oo_flags & NFS4_OO_CONFIRMED)) {
4902 /* Replace unconfirmed owners without checking for replay. */
4903 release_openowner(oo);
4904 oo = NULL;
4905 }
4906 if (oo) {
4907 if (new)
4908 nfs4_free_stateowner(&new->oo_owner);
4909 return oo;
4910 }
4911
4912 new = alloc_stateowner(openowner_slab, &open->op_owner, clp);
4913 if (!new)
4914 return NULL;
4915 new->oo_owner.so_ops = &openowner_ops;
4916 new->oo_owner.so_is_open_owner = 1;
4917 new->oo_owner.so_seqid = open->op_seqid;
4918 new->oo_flags = 0;
4919 if (nfsd4_has_session(cstate))
4920 new->oo_flags |= NFS4_OO_CONFIRMED;
4921 new->oo_time = 0;
4922 new->oo_last_closed_stid = NULL;
4923 INIT_LIST_HEAD(&new->oo_close_lru);
4924 goto retry;
4925 }
4926
4927 static struct nfs4_ol_stateid *
init_open_stateid(struct nfs4_file * fp,struct nfsd4_open * open)4928 init_open_stateid(struct nfs4_file *fp, struct nfsd4_open *open)
4929 {
4930
4931 struct nfs4_openowner *oo = open->op_openowner;
4932 struct nfs4_ol_stateid *retstp = NULL;
4933 struct nfs4_ol_stateid *stp;
4934
4935 stp = open->op_stp;
4936 /* We are moving these outside of the spinlocks to avoid the warnings */
4937 mutex_init(&stp->st_mutex);
4938 mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX);
4939
4940 retry:
4941 spin_lock(&oo->oo_owner.so_client->cl_lock);
4942 spin_lock(&fp->fi_lock);
4943
4944 retstp = nfsd4_find_existing_open(fp, open);
4945 if (retstp)
4946 goto out_unlock;
4947
4948 open->op_stp = NULL;
4949 refcount_inc(&stp->st_stid.sc_count);
4950 stp->st_stid.sc_type = SC_TYPE_OPEN;
4951 INIT_LIST_HEAD(&stp->st_locks);
4952 stp->st_stateowner = nfs4_get_stateowner(&oo->oo_owner);
4953 get_nfs4_file(fp);
4954 stp->st_stid.sc_file = fp;
4955 stp->st_access_bmap = 0;
4956 stp->st_deny_bmap = 0;
4957 stp->st_openstp = NULL;
4958 list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
4959 list_add(&stp->st_perfile, &fp->fi_stateids);
4960
4961 out_unlock:
4962 spin_unlock(&fp->fi_lock);
4963 spin_unlock(&oo->oo_owner.so_client->cl_lock);
4964 if (retstp) {
4965 /* Handle races with CLOSE */
4966 if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
4967 nfs4_put_stid(&retstp->st_stid);
4968 goto retry;
4969 }
4970 /* To keep mutex tracking happy */
4971 mutex_unlock(&stp->st_mutex);
4972 stp = retstp;
4973 }
4974 return stp;
4975 }
4976
4977 /*
4978 * In the 4.0 case we need to keep the owners around a little while to handle
4979 * CLOSE replay. We still do need to release any file access that is held by
4980 * them before returning however.
4981 */
4982 static void
move_to_close_lru(struct nfs4_ol_stateid * s,struct net * net)4983 move_to_close_lru(struct nfs4_ol_stateid *s, struct net *net)
4984 {
4985 struct nfs4_ol_stateid *last;
4986 struct nfs4_openowner *oo = openowner(s->st_stateowner);
4987 struct nfsd_net *nn = net_generic(s->st_stid.sc_client->net,
4988 nfsd_net_id);
4989
4990 dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
4991
4992 /*
4993 * We know that we hold one reference via nfsd4_close, and another
4994 * "persistent" reference for the client. If the refcount is higher
4995 * than 2, then there are still calls in progress that are using this
4996 * stateid. We can't put the sc_file reference until they are finished.
4997 * Wait for the refcount to drop to 2. Since it has been unhashed,
4998 * there should be no danger of the refcount going back up again at
4999 * this point.
5000 * Some threads with a reference might be waiting for rp_locked,
5001 * so tell them to stop waiting.
5002 */
5003 atomic_set(&oo->oo_owner.so_replay.rp_locked, RP_UNHASHED);
5004 wake_up_var(&oo->oo_owner.so_replay.rp_locked);
5005 wait_event(close_wq, refcount_read(&s->st_stid.sc_count) == 2);
5006
5007 release_all_access(s);
5008 if (s->st_stid.sc_file) {
5009 put_nfs4_file(s->st_stid.sc_file);
5010 s->st_stid.sc_file = NULL;
5011 }
5012
5013 spin_lock(&nn->client_lock);
5014 last = oo->oo_last_closed_stid;
5015 oo->oo_last_closed_stid = s;
5016 list_move_tail(&oo->oo_close_lru, &nn->close_lru);
5017 oo->oo_time = ktime_get_boottime_seconds();
5018 spin_unlock(&nn->client_lock);
5019 if (last)
5020 nfs4_put_stid(&last->st_stid);
5021 }
5022
5023 static noinline_for_stack struct nfs4_file *
nfsd4_file_hash_lookup(const struct svc_fh * fhp)5024 nfsd4_file_hash_lookup(const struct svc_fh *fhp)
5025 {
5026 struct inode *inode = d_inode(fhp->fh_dentry);
5027 struct rhlist_head *tmp, *list;
5028 struct nfs4_file *fi;
5029
5030 rcu_read_lock();
5031 list = rhltable_lookup(&nfs4_file_rhltable, &inode,
5032 nfs4_file_rhash_params);
5033 rhl_for_each_entry_rcu(fi, tmp, list, fi_rlist) {
5034 if (fh_match(&fi->fi_fhandle, &fhp->fh_handle)) {
5035 if (refcount_inc_not_zero(&fi->fi_ref)) {
5036 rcu_read_unlock();
5037 return fi;
5038 }
5039 }
5040 }
5041 rcu_read_unlock();
5042 return NULL;
5043 }
5044
5045 /*
5046 * On hash insertion, identify entries with the same inode but
5047 * distinct filehandles. They will all be on the list returned
5048 * by rhltable_lookup().
5049 *
5050 * inode->i_lock prevents racing insertions from adding an entry
5051 * for the same inode/fhp pair twice.
5052 */
5053 static noinline_for_stack struct nfs4_file *
nfsd4_file_hash_insert(struct nfs4_file * new,const struct svc_fh * fhp)5054 nfsd4_file_hash_insert(struct nfs4_file *new, const struct svc_fh *fhp)
5055 {
5056 struct inode *inode = d_inode(fhp->fh_dentry);
5057 struct rhlist_head *tmp, *list;
5058 struct nfs4_file *ret = NULL;
5059 bool alias_found = false;
5060 struct nfs4_file *fi;
5061 int err;
5062
5063 rcu_read_lock();
5064 spin_lock(&inode->i_lock);
5065
5066 list = rhltable_lookup(&nfs4_file_rhltable, &inode,
5067 nfs4_file_rhash_params);
5068 rhl_for_each_entry_rcu(fi, tmp, list, fi_rlist) {
5069 if (fh_match(&fi->fi_fhandle, &fhp->fh_handle)) {
5070 if (refcount_inc_not_zero(&fi->fi_ref))
5071 ret = fi;
5072 } else
5073 fi->fi_aliased = alias_found = true;
5074 }
5075 if (ret)
5076 goto out_unlock;
5077
5078 nfsd4_file_init(fhp, new);
5079 err = rhltable_insert(&nfs4_file_rhltable, &new->fi_rlist,
5080 nfs4_file_rhash_params);
5081 if (err)
5082 goto out_unlock;
5083
5084 new->fi_aliased = alias_found;
5085 ret = new;
5086
5087 out_unlock:
5088 spin_unlock(&inode->i_lock);
5089 rcu_read_unlock();
5090 return ret;
5091 }
5092
nfsd4_file_hash_remove(struct nfs4_file * fi)5093 static noinline_for_stack void nfsd4_file_hash_remove(struct nfs4_file *fi)
5094 {
5095 rhltable_remove(&nfs4_file_rhltable, &fi->fi_rlist,
5096 nfs4_file_rhash_params);
5097 }
5098
5099 /*
5100 * Called to check deny when READ with all zero stateid or
5101 * WRITE with all zero or all one stateid
5102 */
5103 static __be32
nfs4_share_conflict(struct svc_fh * current_fh,unsigned int deny_type)5104 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
5105 {
5106 struct nfs4_file *fp;
5107 __be32 ret = nfs_ok;
5108
5109 fp = nfsd4_file_hash_lookup(current_fh);
5110 if (!fp)
5111 return ret;
5112
5113 /* Check for conflicting share reservations */
5114 spin_lock(&fp->fi_lock);
5115 if (fp->fi_share_deny & deny_type)
5116 ret = nfserr_locked;
5117 spin_unlock(&fp->fi_lock);
5118 put_nfs4_file(fp);
5119 return ret;
5120 }
5121
nfsd4_deleg_present(const struct inode * inode)5122 static bool nfsd4_deleg_present(const struct inode *inode)
5123 {
5124 struct file_lock_context *ctx = locks_inode_context(inode);
5125
5126 return ctx && !list_empty_careful(&ctx->flc_lease);
5127 }
5128
5129 /**
5130 * nfsd_wait_for_delegreturn - wait for delegations to be returned
5131 * @rqstp: the RPC transaction being executed
5132 * @inode: in-core inode of the file being waited for
5133 *
5134 * The timeout prevents deadlock if all nfsd threads happen to be
5135 * tied up waiting for returning delegations.
5136 *
5137 * Return values:
5138 * %true: delegation was returned
5139 * %false: timed out waiting for delegreturn
5140 */
nfsd_wait_for_delegreturn(struct svc_rqst * rqstp,struct inode * inode)5141 bool nfsd_wait_for_delegreturn(struct svc_rqst *rqstp, struct inode *inode)
5142 {
5143 long __maybe_unused timeo;
5144
5145 timeo = wait_var_event_timeout(inode, !nfsd4_deleg_present(inode),
5146 NFSD_DELEGRETURN_TIMEOUT);
5147 trace_nfsd_delegret_wakeup(rqstp, inode, timeo);
5148 return timeo > 0;
5149 }
5150
nfsd4_cb_recall_prepare(struct nfsd4_callback * cb)5151 static void nfsd4_cb_recall_prepare(struct nfsd4_callback *cb)
5152 {
5153 struct nfs4_delegation *dp = cb_to_delegation(cb);
5154 struct nfsd_net *nn = net_generic(dp->dl_stid.sc_client->net,
5155 nfsd_net_id);
5156
5157 block_delegations(&dp->dl_stid.sc_file->fi_fhandle);
5158
5159 /*
5160 * We can't do this in nfsd_break_deleg_cb because it is
5161 * already holding inode->i_lock.
5162 *
5163 * If the dl_time != 0, then we know that it has already been
5164 * queued for a lease break. Don't queue it again.
5165 */
5166 spin_lock(&state_lock);
5167 if (delegation_hashed(dp) && dp->dl_time == 0) {
5168 dp->dl_time = ktime_get_boottime_seconds();
5169 list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
5170 }
5171 spin_unlock(&state_lock);
5172 }
5173
nfsd4_cb_recall_done(struct nfsd4_callback * cb,struct rpc_task * task)5174 static int nfsd4_cb_recall_done(struct nfsd4_callback *cb,
5175 struct rpc_task *task)
5176 {
5177 struct nfs4_delegation *dp = cb_to_delegation(cb);
5178
5179 trace_nfsd_cb_recall_done(&dp->dl_stid.sc_stateid, task);
5180
5181 if (dp->dl_stid.sc_status)
5182 /* CLOSED or REVOKED */
5183 return 1;
5184
5185 switch (task->tk_status) {
5186 case 0:
5187 return 1;
5188 case -NFS4ERR_DELAY:
5189 rpc_delay(task, 2 * HZ);
5190 return 0;
5191 case -EBADHANDLE:
5192 case -NFS4ERR_BAD_STATEID:
5193 /*
5194 * Race: client probably got cb_recall before open reply
5195 * granting delegation.
5196 */
5197 if (dp->dl_retries--) {
5198 rpc_delay(task, 2 * HZ);
5199 return 0;
5200 }
5201 fallthrough;
5202 default:
5203 return 1;
5204 }
5205 }
5206
nfsd4_cb_recall_release(struct nfsd4_callback * cb)5207 static void nfsd4_cb_recall_release(struct nfsd4_callback *cb)
5208 {
5209 struct nfs4_delegation *dp = cb_to_delegation(cb);
5210
5211 nfs4_put_stid(&dp->dl_stid);
5212 }
5213
5214 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops = {
5215 .prepare = nfsd4_cb_recall_prepare,
5216 .done = nfsd4_cb_recall_done,
5217 .release = nfsd4_cb_recall_release,
5218 };
5219
nfsd_break_one_deleg(struct nfs4_delegation * dp)5220 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
5221 {
5222 /*
5223 * We're assuming the state code never drops its reference
5224 * without first removing the lease. Since we're in this lease
5225 * callback (and since the lease code is serialized by the
5226 * flc_lock) we know the server hasn't removed the lease yet, and
5227 * we know it's safe to take a reference.
5228 */
5229 refcount_inc(&dp->dl_stid.sc_count);
5230 WARN_ON_ONCE(!nfsd4_run_cb(&dp->dl_recall));
5231 }
5232
5233 /* Called from break_lease() with flc_lock held. */
5234 static bool
nfsd_break_deleg_cb(struct file_lease * fl)5235 nfsd_break_deleg_cb(struct file_lease *fl)
5236 {
5237 struct nfs4_delegation *dp = (struct nfs4_delegation *) fl->c.flc_owner;
5238 struct nfs4_file *fp = dp->dl_stid.sc_file;
5239 struct nfs4_client *clp = dp->dl_stid.sc_client;
5240 struct nfsd_net *nn;
5241
5242 trace_nfsd_cb_recall(&dp->dl_stid);
5243
5244 dp->dl_recalled = true;
5245 atomic_inc(&clp->cl_delegs_in_recall);
5246 if (try_to_expire_client(clp)) {
5247 nn = net_generic(clp->net, nfsd_net_id);
5248 mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
5249 }
5250
5251 /*
5252 * We don't want the locks code to timeout the lease for us;
5253 * we'll remove it ourself if a delegation isn't returned
5254 * in time:
5255 */
5256 fl->fl_break_time = 0;
5257
5258 fp->fi_had_conflict = true;
5259 nfsd_break_one_deleg(dp);
5260 return false;
5261 }
5262
5263 /**
5264 * nfsd_breaker_owns_lease - Check if lease conflict was resolved
5265 * @fl: Lock state to check
5266 *
5267 * Return values:
5268 * %true: Lease conflict was resolved
5269 * %false: Lease conflict was not resolved.
5270 */
nfsd_breaker_owns_lease(struct file_lease * fl)5271 static bool nfsd_breaker_owns_lease(struct file_lease *fl)
5272 {
5273 struct nfs4_delegation *dl = fl->c.flc_owner;
5274 struct svc_rqst *rqst;
5275 struct nfs4_client *clp;
5276
5277 if (!i_am_nfsd())
5278 return false;
5279 rqst = kthread_data(current);
5280 /* Note rq_prog == NFS_ACL_PROGRAM is also possible: */
5281 if (rqst->rq_prog != NFS_PROGRAM || rqst->rq_vers < 4)
5282 return false;
5283 clp = *(rqst->rq_lease_breaker);
5284 return dl->dl_stid.sc_client == clp;
5285 }
5286
5287 static int
nfsd_change_deleg_cb(struct file_lease * onlist,int arg,struct list_head * dispose)5288 nfsd_change_deleg_cb(struct file_lease *onlist, int arg,
5289 struct list_head *dispose)
5290 {
5291 struct nfs4_delegation *dp = (struct nfs4_delegation *) onlist->c.flc_owner;
5292 struct nfs4_client *clp = dp->dl_stid.sc_client;
5293
5294 if (arg & F_UNLCK) {
5295 if (dp->dl_recalled)
5296 atomic_dec(&clp->cl_delegs_in_recall);
5297 return lease_modify(onlist, arg, dispose);
5298 } else
5299 return -EAGAIN;
5300 }
5301
5302 static const struct lease_manager_operations nfsd_lease_mng_ops = {
5303 .lm_breaker_owns_lease = nfsd_breaker_owns_lease,
5304 .lm_break = nfsd_break_deleg_cb,
5305 .lm_change = nfsd_change_deleg_cb,
5306 };
5307
nfsd4_check_seqid(struct nfsd4_compound_state * cstate,struct nfs4_stateowner * so,u32 seqid)5308 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
5309 {
5310 if (nfsd4_has_session(cstate))
5311 return nfs_ok;
5312 if (seqid == so->so_seqid - 1)
5313 return nfserr_replay_me;
5314 if (seqid == so->so_seqid)
5315 return nfs_ok;
5316 return nfserr_bad_seqid;
5317 }
5318
lookup_clientid(clientid_t * clid,bool sessions,struct nfsd_net * nn)5319 static struct nfs4_client *lookup_clientid(clientid_t *clid, bool sessions,
5320 struct nfsd_net *nn)
5321 {
5322 struct nfs4_client *found;
5323
5324 spin_lock(&nn->client_lock);
5325 found = find_confirmed_client(clid, sessions, nn);
5326 if (found)
5327 atomic_inc(&found->cl_rpc_users);
5328 spin_unlock(&nn->client_lock);
5329 return found;
5330 }
5331
set_client(clientid_t * clid,struct nfsd4_compound_state * cstate,struct nfsd_net * nn)5332 static __be32 set_client(clientid_t *clid,
5333 struct nfsd4_compound_state *cstate,
5334 struct nfsd_net *nn)
5335 {
5336 if (cstate->clp) {
5337 if (!same_clid(&cstate->clp->cl_clientid, clid))
5338 return nfserr_stale_clientid;
5339 return nfs_ok;
5340 }
5341 if (STALE_CLIENTID(clid, nn))
5342 return nfserr_stale_clientid;
5343 /*
5344 * We're in the 4.0 case (otherwise the SEQUENCE op would have
5345 * set cstate->clp), so session = false:
5346 */
5347 cstate->clp = lookup_clientid(clid, false, nn);
5348 if (!cstate->clp)
5349 return nfserr_expired;
5350 return nfs_ok;
5351 }
5352
5353 __be32
nfsd4_process_open1(struct nfsd4_compound_state * cstate,struct nfsd4_open * open,struct nfsd_net * nn)5354 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
5355 struct nfsd4_open *open, struct nfsd_net *nn)
5356 {
5357 clientid_t *clientid = &open->op_clientid;
5358 struct nfs4_client *clp = NULL;
5359 unsigned int strhashval;
5360 struct nfs4_openowner *oo = NULL;
5361 __be32 status;
5362
5363 /*
5364 * In case we need it later, after we've already created the
5365 * file and don't want to risk a further failure:
5366 */
5367 open->op_file = nfsd4_alloc_file();
5368 if (open->op_file == NULL)
5369 return nfserr_jukebox;
5370
5371 status = set_client(clientid, cstate, nn);
5372 if (status)
5373 return status;
5374 clp = cstate->clp;
5375
5376 strhashval = ownerstr_hashval(&open->op_owner);
5377 retry:
5378 oo = find_or_alloc_open_stateowner(strhashval, open, cstate);
5379 open->op_openowner = oo;
5380 if (!oo)
5381 return nfserr_jukebox;
5382 if (nfsd4_cstate_assign_replay(cstate, &oo->oo_owner) == -EAGAIN) {
5383 nfs4_put_stateowner(&oo->oo_owner);
5384 goto retry;
5385 }
5386 status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
5387 if (status)
5388 return status;
5389
5390 open->op_stp = nfs4_alloc_open_stateid(clp);
5391 if (!open->op_stp)
5392 return nfserr_jukebox;
5393
5394 if (nfsd4_has_session(cstate) &&
5395 (cstate->current_fh.fh_export->ex_flags & NFSEXP_PNFS)) {
5396 open->op_odstate = alloc_clnt_odstate(clp);
5397 if (!open->op_odstate)
5398 return nfserr_jukebox;
5399 }
5400
5401 return nfs_ok;
5402 }
5403
5404 static inline __be32
nfs4_check_delegmode(struct nfs4_delegation * dp,int flags)5405 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
5406 {
5407 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
5408 return nfserr_openmode;
5409 else
5410 return nfs_ok;
5411 }
5412
share_access_to_flags(u32 share_access)5413 static int share_access_to_flags(u32 share_access)
5414 {
5415 return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
5416 }
5417
find_deleg_stateid(struct nfs4_client * cl,stateid_t * s)5418 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl,
5419 stateid_t *s)
5420 {
5421 struct nfs4_stid *ret;
5422
5423 ret = find_stateid_by_type(cl, s, SC_TYPE_DELEG, SC_STATUS_REVOKED);
5424 if (!ret)
5425 return NULL;
5426 return delegstateid(ret);
5427 }
5428
nfsd4_is_deleg_cur(struct nfsd4_open * open)5429 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
5430 {
5431 return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
5432 open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
5433 }
5434
5435 static __be32
nfs4_check_deleg(struct nfs4_client * cl,struct nfsd4_open * open,struct nfs4_delegation ** dp)5436 nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
5437 struct nfs4_delegation **dp)
5438 {
5439 int flags;
5440 __be32 status = nfserr_bad_stateid;
5441 struct nfs4_delegation *deleg;
5442
5443 deleg = find_deleg_stateid(cl, &open->op_delegate_stateid);
5444 if (deleg == NULL)
5445 goto out;
5446 if (deleg->dl_stid.sc_status & SC_STATUS_ADMIN_REVOKED) {
5447 nfs4_put_stid(&deleg->dl_stid);
5448 status = nfserr_admin_revoked;
5449 goto out;
5450 }
5451 if (deleg->dl_stid.sc_status & SC_STATUS_REVOKED) {
5452 nfs4_put_stid(&deleg->dl_stid);
5453 nfsd40_drop_revoked_stid(cl, &open->op_delegate_stateid);
5454 status = nfserr_deleg_revoked;
5455 goto out;
5456 }
5457 flags = share_access_to_flags(open->op_share_access);
5458 status = nfs4_check_delegmode(deleg, flags);
5459 if (status) {
5460 nfs4_put_stid(&deleg->dl_stid);
5461 goto out;
5462 }
5463 *dp = deleg;
5464 out:
5465 if (!nfsd4_is_deleg_cur(open))
5466 return nfs_ok;
5467 if (status)
5468 return status;
5469 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
5470 return nfs_ok;
5471 }
5472
nfs4_access_to_access(u32 nfs4_access)5473 static inline int nfs4_access_to_access(u32 nfs4_access)
5474 {
5475 int flags = 0;
5476
5477 if (nfs4_access & NFS4_SHARE_ACCESS_READ)
5478 flags |= NFSD_MAY_READ;
5479 if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
5480 flags |= NFSD_MAY_WRITE;
5481 return flags;
5482 }
5483
5484 static inline __be32
nfsd4_truncate(struct svc_rqst * rqstp,struct svc_fh * fh,struct nfsd4_open * open)5485 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
5486 struct nfsd4_open *open)
5487 {
5488 struct iattr iattr = {
5489 .ia_valid = ATTR_SIZE,
5490 .ia_size = 0,
5491 };
5492 struct nfsd_attrs attrs = {
5493 .na_iattr = &iattr,
5494 };
5495 if (!open->op_truncate)
5496 return 0;
5497 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
5498 return nfserr_inval;
5499 return nfsd_setattr(rqstp, fh, &attrs, NULL);
5500 }
5501
nfs4_get_vfs_file(struct svc_rqst * rqstp,struct nfs4_file * fp,struct svc_fh * cur_fh,struct nfs4_ol_stateid * stp,struct nfsd4_open * open,bool new_stp)5502 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
5503 struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
5504 struct nfsd4_open *open, bool new_stp)
5505 {
5506 struct nfsd_file *nf = NULL;
5507 __be32 status;
5508 int oflag = nfs4_access_to_omode(open->op_share_access);
5509 int access = nfs4_access_to_access(open->op_share_access);
5510 unsigned char old_access_bmap, old_deny_bmap;
5511
5512 spin_lock(&fp->fi_lock);
5513
5514 /*
5515 * Are we trying to set a deny mode that would conflict with
5516 * current access?
5517 */
5518 status = nfs4_file_check_deny(fp, open->op_share_deny);
5519 if (status != nfs_ok) {
5520 if (status != nfserr_share_denied) {
5521 spin_unlock(&fp->fi_lock);
5522 goto out;
5523 }
5524 if (nfs4_resolve_deny_conflicts_locked(fp, new_stp,
5525 stp, open->op_share_deny, false))
5526 status = nfserr_jukebox;
5527 spin_unlock(&fp->fi_lock);
5528 goto out;
5529 }
5530
5531 /* set access to the file */
5532 status = nfs4_file_get_access(fp, open->op_share_access);
5533 if (status != nfs_ok) {
5534 if (status != nfserr_share_denied) {
5535 spin_unlock(&fp->fi_lock);
5536 goto out;
5537 }
5538 if (nfs4_resolve_deny_conflicts_locked(fp, new_stp,
5539 stp, open->op_share_access, true))
5540 status = nfserr_jukebox;
5541 spin_unlock(&fp->fi_lock);
5542 goto out;
5543 }
5544
5545 /* Set access bits in stateid */
5546 old_access_bmap = stp->st_access_bmap;
5547 set_access(open->op_share_access, stp);
5548
5549 /* Set new deny mask */
5550 old_deny_bmap = stp->st_deny_bmap;
5551 set_deny(open->op_share_deny, stp);
5552 fp->fi_share_deny |= (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
5553
5554 if (!fp->fi_fds[oflag]) {
5555 spin_unlock(&fp->fi_lock);
5556
5557 status = nfsd_file_acquire_opened(rqstp, cur_fh, access,
5558 open->op_filp, &nf);
5559 if (status != nfs_ok)
5560 goto out_put_access;
5561
5562 spin_lock(&fp->fi_lock);
5563 if (!fp->fi_fds[oflag]) {
5564 fp->fi_fds[oflag] = nf;
5565 nf = NULL;
5566 }
5567 }
5568 spin_unlock(&fp->fi_lock);
5569 if (nf)
5570 nfsd_file_put(nf);
5571
5572 status = nfserrno(nfsd_open_break_lease(cur_fh->fh_dentry->d_inode,
5573 access));
5574 if (status)
5575 goto out_put_access;
5576
5577 status = nfsd4_truncate(rqstp, cur_fh, open);
5578 if (status)
5579 goto out_put_access;
5580 out:
5581 return status;
5582 out_put_access:
5583 stp->st_access_bmap = old_access_bmap;
5584 nfs4_file_put_access(fp, open->op_share_access);
5585 reset_union_bmap_deny(bmap_to_share_mode(old_deny_bmap), stp);
5586 goto out;
5587 }
5588
5589 static __be32
nfs4_upgrade_open(struct svc_rqst * rqstp,struct nfs4_file * fp,struct svc_fh * cur_fh,struct nfs4_ol_stateid * stp,struct nfsd4_open * open)5590 nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp,
5591 struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
5592 struct nfsd4_open *open)
5593 {
5594 __be32 status;
5595 unsigned char old_deny_bmap = stp->st_deny_bmap;
5596
5597 if (!test_access(open->op_share_access, stp))
5598 return nfs4_get_vfs_file(rqstp, fp, cur_fh, stp, open, false);
5599
5600 /* test and set deny mode */
5601 spin_lock(&fp->fi_lock);
5602 status = nfs4_file_check_deny(fp, open->op_share_deny);
5603 switch (status) {
5604 case nfs_ok:
5605 set_deny(open->op_share_deny, stp);
5606 fp->fi_share_deny |=
5607 (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
5608 break;
5609 case nfserr_share_denied:
5610 if (nfs4_resolve_deny_conflicts_locked(fp, false,
5611 stp, open->op_share_deny, false))
5612 status = nfserr_jukebox;
5613 break;
5614 }
5615 spin_unlock(&fp->fi_lock);
5616
5617 if (status != nfs_ok)
5618 return status;
5619
5620 status = nfsd4_truncate(rqstp, cur_fh, open);
5621 if (status != nfs_ok)
5622 reset_union_bmap_deny(old_deny_bmap, stp);
5623 return status;
5624 }
5625
5626 /* Should we give out recallable state?: */
nfsd4_cb_channel_good(struct nfs4_client * clp)5627 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
5628 {
5629 if (clp->cl_cb_state == NFSD4_CB_UP)
5630 return true;
5631 /*
5632 * In the sessions case, since we don't have to establish a
5633 * separate connection for callbacks, we assume it's OK
5634 * until we hear otherwise:
5635 */
5636 return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
5637 }
5638
nfs4_alloc_init_lease(struct nfs4_delegation * dp,int flag)5639 static struct file_lease *nfs4_alloc_init_lease(struct nfs4_delegation *dp,
5640 int flag)
5641 {
5642 struct file_lease *fl;
5643
5644 fl = locks_alloc_lease();
5645 if (!fl)
5646 return NULL;
5647 fl->fl_lmops = &nfsd_lease_mng_ops;
5648 fl->c.flc_flags = FL_DELEG;
5649 fl->c.flc_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
5650 fl->c.flc_owner = (fl_owner_t)dp;
5651 fl->c.flc_pid = current->tgid;
5652 fl->c.flc_file = dp->dl_stid.sc_file->fi_deleg_file->nf_file;
5653 return fl;
5654 }
5655
nfsd4_check_conflicting_opens(struct nfs4_client * clp,struct nfs4_file * fp)5656 static int nfsd4_check_conflicting_opens(struct nfs4_client *clp,
5657 struct nfs4_file *fp)
5658 {
5659 struct nfs4_ol_stateid *st;
5660 struct file *f = fp->fi_deleg_file->nf_file;
5661 struct inode *ino = file_inode(f);
5662 int writes;
5663
5664 writes = atomic_read(&ino->i_writecount);
5665 if (!writes)
5666 return 0;
5667 /*
5668 * There could be multiple filehandles (hence multiple
5669 * nfs4_files) referencing this file, but that's not too
5670 * common; let's just give up in that case rather than
5671 * trying to go look up all the clients using that other
5672 * nfs4_file as well:
5673 */
5674 if (fp->fi_aliased)
5675 return -EAGAIN;
5676 /*
5677 * If there's a close in progress, make sure that we see it
5678 * clear any fi_fds[] entries before we see it decrement
5679 * i_writecount:
5680 */
5681 smp_mb__after_atomic();
5682
5683 if (fp->fi_fds[O_WRONLY])
5684 writes--;
5685 if (fp->fi_fds[O_RDWR])
5686 writes--;
5687 if (writes > 0)
5688 return -EAGAIN; /* There may be non-NFSv4 writers */
5689 /*
5690 * It's possible there are non-NFSv4 write opens in progress,
5691 * but if they haven't incremented i_writecount yet then they
5692 * also haven't called break lease yet; so, they'll break this
5693 * lease soon enough. So, all that's left to check for is NFSv4
5694 * opens:
5695 */
5696 spin_lock(&fp->fi_lock);
5697 list_for_each_entry(st, &fp->fi_stateids, st_perfile) {
5698 if (st->st_openstp == NULL /* it's an open */ &&
5699 access_permit_write(st) &&
5700 st->st_stid.sc_client != clp) {
5701 spin_unlock(&fp->fi_lock);
5702 return -EAGAIN;
5703 }
5704 }
5705 spin_unlock(&fp->fi_lock);
5706 /*
5707 * There's a small chance that we could be racing with another
5708 * NFSv4 open. However, any open that hasn't added itself to
5709 * the fi_stateids list also hasn't called break_lease yet; so,
5710 * they'll break this lease soon enough.
5711 */
5712 return 0;
5713 }
5714
5715 /*
5716 * It's possible that between opening the dentry and setting the delegation,
5717 * that it has been renamed or unlinked. Redo the lookup to verify that this
5718 * hasn't happened.
5719 */
5720 static int
nfsd4_verify_deleg_dentry(struct nfsd4_open * open,struct nfs4_file * fp,struct svc_fh * parent)5721 nfsd4_verify_deleg_dentry(struct nfsd4_open *open, struct nfs4_file *fp,
5722 struct svc_fh *parent)
5723 {
5724 struct svc_export *exp;
5725 struct dentry *child;
5726 __be32 err;
5727
5728 err = nfsd_lookup_dentry(open->op_rqstp, parent,
5729 open->op_fname, open->op_fnamelen,
5730 &exp, &child);
5731
5732 if (err)
5733 return -EAGAIN;
5734
5735 exp_put(exp);
5736 dput(child);
5737 if (child != file_dentry(fp->fi_deleg_file->nf_file))
5738 return -EAGAIN;
5739
5740 return 0;
5741 }
5742
5743 /*
5744 * We avoid breaking delegations held by a client due to its own activity, but
5745 * clearing setuid/setgid bits on a write is an implicit activity and the client
5746 * may not notice and continue using the old mode. Avoid giving out a delegation
5747 * on setuid/setgid files when the client is requesting an open for write.
5748 */
5749 static int
nfsd4_verify_setuid_write(struct nfsd4_open * open,struct nfsd_file * nf)5750 nfsd4_verify_setuid_write(struct nfsd4_open *open, struct nfsd_file *nf)
5751 {
5752 struct inode *inode = file_inode(nf->nf_file);
5753
5754 if ((open->op_share_access & NFS4_SHARE_ACCESS_WRITE) &&
5755 (inode->i_mode & (S_ISUID|S_ISGID)))
5756 return -EAGAIN;
5757 return 0;
5758 }
5759
5760 static struct nfs4_delegation *
nfs4_set_delegation(struct nfsd4_open * open,struct nfs4_ol_stateid * stp,struct svc_fh * parent)5761 nfs4_set_delegation(struct nfsd4_open *open, struct nfs4_ol_stateid *stp,
5762 struct svc_fh *parent)
5763 {
5764 int status = 0;
5765 struct nfs4_client *clp = stp->st_stid.sc_client;
5766 struct nfs4_file *fp = stp->st_stid.sc_file;
5767 struct nfs4_clnt_odstate *odstate = stp->st_clnt_odstate;
5768 struct nfs4_delegation *dp;
5769 struct nfsd_file *nf = NULL;
5770 struct file_lease *fl;
5771 u32 dl_type;
5772
5773 /*
5774 * The fi_had_conflict and nfs_get_existing_delegation checks
5775 * here are just optimizations; we'll need to recheck them at
5776 * the end:
5777 */
5778 if (fp->fi_had_conflict)
5779 return ERR_PTR(-EAGAIN);
5780
5781 /*
5782 * Try for a write delegation first. RFC8881 section 10.4 says:
5783 *
5784 * "An OPEN_DELEGATE_WRITE delegation allows the client to handle,
5785 * on its own, all opens."
5786 *
5787 * Furthermore the client can use a write delegation for most READ
5788 * operations as well, so we require a O_RDWR file here.
5789 *
5790 * Offer a write delegation in the case of a BOTH open, and ensure
5791 * we get the O_RDWR descriptor.
5792 */
5793 if ((open->op_share_access & NFS4_SHARE_ACCESS_BOTH) == NFS4_SHARE_ACCESS_BOTH) {
5794 nf = find_rw_file(fp);
5795 dl_type = NFS4_OPEN_DELEGATE_WRITE;
5796 }
5797
5798 /*
5799 * If the file is being opened O_RDONLY or we couldn't get a O_RDWR
5800 * file for some reason, then try for a read delegation instead.
5801 */
5802 if (!nf && (open->op_share_access & NFS4_SHARE_ACCESS_READ)) {
5803 nf = find_readable_file(fp);
5804 dl_type = NFS4_OPEN_DELEGATE_READ;
5805 }
5806
5807 if (!nf)
5808 return ERR_PTR(-EAGAIN);
5809
5810 spin_lock(&state_lock);
5811 spin_lock(&fp->fi_lock);
5812 if (nfs4_delegation_exists(clp, fp))
5813 status = -EAGAIN;
5814 else if (nfsd4_verify_setuid_write(open, nf))
5815 status = -EAGAIN;
5816 else if (!fp->fi_deleg_file) {
5817 fp->fi_deleg_file = nf;
5818 /* increment early to prevent fi_deleg_file from being
5819 * cleared */
5820 fp->fi_delegees = 1;
5821 nf = NULL;
5822 } else
5823 fp->fi_delegees++;
5824 spin_unlock(&fp->fi_lock);
5825 spin_unlock(&state_lock);
5826 if (nf)
5827 nfsd_file_put(nf);
5828 if (status)
5829 return ERR_PTR(status);
5830
5831 status = -ENOMEM;
5832 dp = alloc_init_deleg(clp, fp, odstate, dl_type);
5833 if (!dp)
5834 goto out_delegees;
5835
5836 fl = nfs4_alloc_init_lease(dp, dl_type);
5837 if (!fl)
5838 goto out_clnt_odstate;
5839
5840 status = kernel_setlease(fp->fi_deleg_file->nf_file,
5841 fl->c.flc_type, &fl, NULL);
5842 if (fl)
5843 locks_free_lease(fl);
5844 if (status)
5845 goto out_clnt_odstate;
5846
5847 if (parent) {
5848 status = nfsd4_verify_deleg_dentry(open, fp, parent);
5849 if (status)
5850 goto out_unlock;
5851 }
5852
5853 status = nfsd4_check_conflicting_opens(clp, fp);
5854 if (status)
5855 goto out_unlock;
5856
5857 /*
5858 * Now that the deleg is set, check again to ensure that nothing
5859 * raced in and changed the mode while we weren't lookng.
5860 */
5861 status = nfsd4_verify_setuid_write(open, fp->fi_deleg_file);
5862 if (status)
5863 goto out_unlock;
5864
5865 status = -EAGAIN;
5866 if (fp->fi_had_conflict)
5867 goto out_unlock;
5868
5869 spin_lock(&state_lock);
5870 spin_lock(&clp->cl_lock);
5871 spin_lock(&fp->fi_lock);
5872 status = hash_delegation_locked(dp, fp);
5873 spin_unlock(&fp->fi_lock);
5874 spin_unlock(&clp->cl_lock);
5875 spin_unlock(&state_lock);
5876
5877 if (status)
5878 goto out_unlock;
5879
5880 return dp;
5881 out_unlock:
5882 kernel_setlease(fp->fi_deleg_file->nf_file, F_UNLCK, NULL, (void **)&dp);
5883 out_clnt_odstate:
5884 put_clnt_odstate(dp->dl_clnt_odstate);
5885 nfs4_put_stid(&dp->dl_stid);
5886 out_delegees:
5887 put_deleg_file(fp);
5888 return ERR_PTR(status);
5889 }
5890
nfsd4_open_deleg_none_ext(struct nfsd4_open * open,int status)5891 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
5892 {
5893 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
5894 if (status == -EAGAIN)
5895 open->op_why_no_deleg = WND4_CONTENTION;
5896 else {
5897 open->op_why_no_deleg = WND4_RESOURCE;
5898 switch (open->op_deleg_want) {
5899 case NFS4_SHARE_WANT_READ_DELEG:
5900 case NFS4_SHARE_WANT_WRITE_DELEG:
5901 case NFS4_SHARE_WANT_ANY_DELEG:
5902 break;
5903 case NFS4_SHARE_WANT_CANCEL:
5904 open->op_why_no_deleg = WND4_CANCELLED;
5905 break;
5906 case NFS4_SHARE_WANT_NO_DELEG:
5907 WARN_ON_ONCE(1);
5908 }
5909 }
5910 }
5911
5912 /*
5913 * The Linux NFS server does not offer write delegations to NFSv4.0
5914 * clients in order to avoid conflicts between write delegations and
5915 * GETATTRs requesting CHANGE or SIZE attributes.
5916 *
5917 * With NFSv4.1 and later minorversions, the SEQUENCE operation that
5918 * begins each COMPOUND contains a client ID. Delegation recall can
5919 * be avoided when the server recognizes the client sending a
5920 * GETATTR also holds write delegation it conflicts with.
5921 *
5922 * However, the NFSv4.0 protocol does not enable a server to
5923 * determine that a GETATTR originated from the client holding the
5924 * conflicting delegation versus coming from some other client. Per
5925 * RFC 7530 Section 16.7.5, the server must recall or send a
5926 * CB_GETATTR even when the GETATTR originates from the client that
5927 * holds the conflicting delegation.
5928 *
5929 * An NFSv4.0 client can trigger a pathological situation if it
5930 * always sends a DELEGRETURN preceded by a conflicting GETATTR in
5931 * the same COMPOUND. COMPOUND execution will always stop at the
5932 * GETATTR and the DELEGRETURN will never get executed. The server
5933 * eventually revokes the delegation, which can result in loss of
5934 * open or lock state.
5935 */
5936 static void
nfs4_open_delegation(struct nfsd4_open * open,struct nfs4_ol_stateid * stp,struct svc_fh * currentfh)5937 nfs4_open_delegation(struct nfsd4_open *open, struct nfs4_ol_stateid *stp,
5938 struct svc_fh *currentfh)
5939 {
5940 struct nfs4_delegation *dp;
5941 struct nfs4_openowner *oo = openowner(stp->st_stateowner);
5942 struct nfs4_client *clp = stp->st_stid.sc_client;
5943 struct svc_fh *parent = NULL;
5944 int cb_up;
5945 int status = 0;
5946 struct kstat stat;
5947 struct path path;
5948
5949 cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
5950 open->op_recall = false;
5951 switch (open->op_claim_type) {
5952 case NFS4_OPEN_CLAIM_PREVIOUS:
5953 if (!cb_up)
5954 open->op_recall = true;
5955 break;
5956 case NFS4_OPEN_CLAIM_NULL:
5957 parent = currentfh;
5958 fallthrough;
5959 case NFS4_OPEN_CLAIM_FH:
5960 /*
5961 * Let's not give out any delegations till everyone's
5962 * had the chance to reclaim theirs, *and* until
5963 * NLM locks have all been reclaimed:
5964 */
5965 if (locks_in_grace(clp->net))
5966 goto out_no_deleg;
5967 if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
5968 goto out_no_deleg;
5969 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE &&
5970 !clp->cl_minorversion)
5971 goto out_no_deleg;
5972 break;
5973 default:
5974 goto out_no_deleg;
5975 }
5976 dp = nfs4_set_delegation(open, stp, parent);
5977 if (IS_ERR(dp))
5978 goto out_no_deleg;
5979
5980 memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
5981
5982 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) {
5983 open->op_delegate_type = NFS4_OPEN_DELEGATE_WRITE;
5984 trace_nfsd_deleg_write(&dp->dl_stid.sc_stateid);
5985 path.mnt = currentfh->fh_export->ex_path.mnt;
5986 path.dentry = currentfh->fh_dentry;
5987 if (vfs_getattr(&path, &stat,
5988 (STATX_SIZE | STATX_CTIME | STATX_CHANGE_COOKIE),
5989 AT_STATX_SYNC_AS_STAT)) {
5990 nfs4_put_stid(&dp->dl_stid);
5991 destroy_delegation(dp);
5992 goto out_no_deleg;
5993 }
5994 dp->dl_cb_fattr.ncf_cur_fsize = stat.size;
5995 dp->dl_cb_fattr.ncf_initial_cinfo =
5996 nfsd4_change_attribute(&stat, d_inode(currentfh->fh_dentry));
5997 } else {
5998 open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
5999 trace_nfsd_deleg_read(&dp->dl_stid.sc_stateid);
6000 }
6001 nfs4_put_stid(&dp->dl_stid);
6002 return;
6003 out_no_deleg:
6004 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
6005 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
6006 open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) {
6007 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
6008 open->op_recall = true;
6009 }
6010
6011 /* 4.1 client asking for a delegation? */
6012 if (open->op_deleg_want)
6013 nfsd4_open_deleg_none_ext(open, status);
6014 return;
6015 }
6016
nfsd4_deleg_xgrade_none_ext(struct nfsd4_open * open,struct nfs4_delegation * dp)6017 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
6018 struct nfs4_delegation *dp)
6019 {
6020 if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
6021 dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
6022 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
6023 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
6024 } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
6025 dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
6026 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
6027 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
6028 }
6029 /* Otherwise the client must be confused wanting a delegation
6030 * it already has, therefore we don't return
6031 * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
6032 */
6033 }
6034
6035 /**
6036 * nfsd4_process_open2 - finish open processing
6037 * @rqstp: the RPC transaction being executed
6038 * @current_fh: NFSv4 COMPOUND's current filehandle
6039 * @open: OPEN arguments
6040 *
6041 * If successful, (1) truncate the file if open->op_truncate was
6042 * set, (2) set open->op_stateid, (3) set open->op_delegation.
6043 *
6044 * Returns %nfs_ok on success; otherwise an nfs4stat value in
6045 * network byte order is returned.
6046 */
6047 __be32
nfsd4_process_open2(struct svc_rqst * rqstp,struct svc_fh * current_fh,struct nfsd4_open * open)6048 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
6049 {
6050 struct nfsd4_compoundres *resp = rqstp->rq_resp;
6051 struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
6052 struct nfs4_file *fp = NULL;
6053 struct nfs4_ol_stateid *stp = NULL;
6054 struct nfs4_delegation *dp = NULL;
6055 __be32 status;
6056 bool new_stp = false;
6057
6058 /*
6059 * Lookup file; if found, lookup stateid and check open request,
6060 * and check for delegations in the process of being recalled.
6061 * If not found, create the nfs4_file struct
6062 */
6063 fp = nfsd4_file_hash_insert(open->op_file, current_fh);
6064 if (unlikely(!fp))
6065 return nfserr_jukebox;
6066 if (fp != open->op_file) {
6067 status = nfs4_check_deleg(cl, open, &dp);
6068 if (status)
6069 goto out;
6070 stp = nfsd4_find_and_lock_existing_open(fp, open);
6071 } else {
6072 open->op_file = NULL;
6073 status = nfserr_bad_stateid;
6074 if (nfsd4_is_deleg_cur(open))
6075 goto out;
6076 }
6077
6078 if (!stp) {
6079 stp = init_open_stateid(fp, open);
6080 if (!open->op_stp)
6081 new_stp = true;
6082 }
6083
6084 /*
6085 * OPEN the file, or upgrade an existing OPEN.
6086 * If truncate fails, the OPEN fails.
6087 *
6088 * stp is already locked.
6089 */
6090 if (!new_stp) {
6091 /* Stateid was found, this is an OPEN upgrade */
6092 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
6093 if (status) {
6094 mutex_unlock(&stp->st_mutex);
6095 goto out;
6096 }
6097 } else {
6098 status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open, true);
6099 if (status) {
6100 release_open_stateid(stp);
6101 mutex_unlock(&stp->st_mutex);
6102 goto out;
6103 }
6104
6105 stp->st_clnt_odstate = find_or_hash_clnt_odstate(fp,
6106 open->op_odstate);
6107 if (stp->st_clnt_odstate == open->op_odstate)
6108 open->op_odstate = NULL;
6109 }
6110
6111 nfs4_inc_and_copy_stateid(&open->op_stateid, &stp->st_stid);
6112 mutex_unlock(&stp->st_mutex);
6113
6114 if (nfsd4_has_session(&resp->cstate)) {
6115 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
6116 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
6117 open->op_why_no_deleg = WND4_NOT_WANTED;
6118 goto nodeleg;
6119 }
6120 }
6121
6122 /*
6123 * Attempt to hand out a delegation. No error return, because the
6124 * OPEN succeeds even if we fail.
6125 */
6126 nfs4_open_delegation(open, stp, &resp->cstate.current_fh);
6127 nodeleg:
6128 status = nfs_ok;
6129 trace_nfsd_open(&stp->st_stid.sc_stateid);
6130 out:
6131 /* 4.1 client trying to upgrade/downgrade delegation? */
6132 if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
6133 open->op_deleg_want)
6134 nfsd4_deleg_xgrade_none_ext(open, dp);
6135
6136 if (fp)
6137 put_nfs4_file(fp);
6138 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
6139 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
6140 /*
6141 * To finish the open response, we just need to set the rflags.
6142 */
6143 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
6144 if (nfsd4_has_session(&resp->cstate))
6145 open->op_rflags |= NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK;
6146 else if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED))
6147 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
6148
6149 if (dp)
6150 nfs4_put_stid(&dp->dl_stid);
6151 if (stp)
6152 nfs4_put_stid(&stp->st_stid);
6153
6154 return status;
6155 }
6156
nfsd4_cleanup_open_state(struct nfsd4_compound_state * cstate,struct nfsd4_open * open)6157 void nfsd4_cleanup_open_state(struct nfsd4_compound_state *cstate,
6158 struct nfsd4_open *open)
6159 {
6160 if (open->op_openowner)
6161 nfs4_put_stateowner(&open->op_openowner->oo_owner);
6162 if (open->op_file)
6163 kmem_cache_free(file_slab, open->op_file);
6164 if (open->op_stp)
6165 nfs4_put_stid(&open->op_stp->st_stid);
6166 if (open->op_odstate)
6167 kmem_cache_free(odstate_slab, open->op_odstate);
6168 }
6169
6170 __be32
nfsd4_renew(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)6171 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6172 union nfsd4_op_u *u)
6173 {
6174 clientid_t *clid = &u->renew;
6175 struct nfs4_client *clp;
6176 __be32 status;
6177 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6178
6179 trace_nfsd_clid_renew(clid);
6180 status = set_client(clid, cstate, nn);
6181 if (status)
6182 return status;
6183 clp = cstate->clp;
6184 if (!list_empty(&clp->cl_delegations)
6185 && clp->cl_cb_state != NFSD4_CB_UP)
6186 return nfserr_cb_path_down;
6187 return nfs_ok;
6188 }
6189
6190 void
nfsd4_end_grace(struct nfsd_net * nn)6191 nfsd4_end_grace(struct nfsd_net *nn)
6192 {
6193 /* do nothing if grace period already ended */
6194 if (nn->grace_ended)
6195 return;
6196
6197 trace_nfsd_grace_complete(nn);
6198 nn->grace_ended = true;
6199 /*
6200 * If the server goes down again right now, an NFSv4
6201 * client will still be allowed to reclaim after it comes back up,
6202 * even if it hasn't yet had a chance to reclaim state this time.
6203 *
6204 */
6205 nfsd4_record_grace_done(nn);
6206 /*
6207 * At this point, NFSv4 clients can still reclaim. But if the
6208 * server crashes, any that have not yet reclaimed will be out
6209 * of luck on the next boot.
6210 *
6211 * (NFSv4.1+ clients are considered to have reclaimed once they
6212 * call RECLAIM_COMPLETE. NFSv4.0 clients are considered to
6213 * have reclaimed after their first OPEN.)
6214 */
6215 locks_end_grace(&nn->nfsd4_manager);
6216 /*
6217 * At this point, and once lockd and/or any other containers
6218 * exit their grace period, further reclaims will fail and
6219 * regular locking can resume.
6220 */
6221 }
6222
6223 /*
6224 * If we've waited a lease period but there are still clients trying to
6225 * reclaim, wait a little longer to give them a chance to finish.
6226 */
clients_still_reclaiming(struct nfsd_net * nn)6227 static bool clients_still_reclaiming(struct nfsd_net *nn)
6228 {
6229 time64_t double_grace_period_end = nn->boot_time +
6230 2 * nn->nfsd4_lease;
6231
6232 if (nn->track_reclaim_completes &&
6233 atomic_read(&nn->nr_reclaim_complete) ==
6234 nn->reclaim_str_hashtbl_size)
6235 return false;
6236 if (!nn->somebody_reclaimed)
6237 return false;
6238 nn->somebody_reclaimed = false;
6239 /*
6240 * If we've given them *two* lease times to reclaim, and they're
6241 * still not done, give up:
6242 */
6243 if (ktime_get_boottime_seconds() > double_grace_period_end)
6244 return false;
6245 return true;
6246 }
6247
6248 struct laundry_time {
6249 time64_t cutoff;
6250 time64_t new_timeo;
6251 };
6252
state_expired(struct laundry_time * lt,time64_t last_refresh)6253 static bool state_expired(struct laundry_time *lt, time64_t last_refresh)
6254 {
6255 time64_t time_remaining;
6256
6257 if (last_refresh < lt->cutoff)
6258 return true;
6259 time_remaining = last_refresh - lt->cutoff;
6260 lt->new_timeo = min(lt->new_timeo, time_remaining);
6261 return false;
6262 }
6263
6264 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
nfsd4_ssc_init_umount_work(struct nfsd_net * nn)6265 void nfsd4_ssc_init_umount_work(struct nfsd_net *nn)
6266 {
6267 spin_lock_init(&nn->nfsd_ssc_lock);
6268 INIT_LIST_HEAD(&nn->nfsd_ssc_mount_list);
6269 init_waitqueue_head(&nn->nfsd_ssc_waitq);
6270 }
6271 EXPORT_SYMBOL_GPL(nfsd4_ssc_init_umount_work);
6272
6273 /*
6274 * This is called when nfsd is being shutdown, after all inter_ssc
6275 * cleanup were done, to destroy the ssc delayed unmount list.
6276 */
nfsd4_ssc_shutdown_umount(struct nfsd_net * nn)6277 static void nfsd4_ssc_shutdown_umount(struct nfsd_net *nn)
6278 {
6279 struct nfsd4_ssc_umount_item *ni = NULL;
6280 struct nfsd4_ssc_umount_item *tmp;
6281
6282 spin_lock(&nn->nfsd_ssc_lock);
6283 list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
6284 list_del(&ni->nsui_list);
6285 spin_unlock(&nn->nfsd_ssc_lock);
6286 mntput(ni->nsui_vfsmount);
6287 kfree(ni);
6288 spin_lock(&nn->nfsd_ssc_lock);
6289 }
6290 spin_unlock(&nn->nfsd_ssc_lock);
6291 }
6292
nfsd4_ssc_expire_umount(struct nfsd_net * nn)6293 static void nfsd4_ssc_expire_umount(struct nfsd_net *nn)
6294 {
6295 bool do_wakeup = false;
6296 struct nfsd4_ssc_umount_item *ni = NULL;
6297 struct nfsd4_ssc_umount_item *tmp;
6298
6299 spin_lock(&nn->nfsd_ssc_lock);
6300 list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
6301 if (time_after(jiffies, ni->nsui_expire)) {
6302 if (refcount_read(&ni->nsui_refcnt) > 1)
6303 continue;
6304
6305 /* mark being unmount */
6306 ni->nsui_busy = true;
6307 spin_unlock(&nn->nfsd_ssc_lock);
6308 mntput(ni->nsui_vfsmount);
6309 spin_lock(&nn->nfsd_ssc_lock);
6310
6311 /* waiters need to start from begin of list */
6312 list_del(&ni->nsui_list);
6313 kfree(ni);
6314
6315 /* wakeup ssc_connect waiters */
6316 do_wakeup = true;
6317 continue;
6318 }
6319 break;
6320 }
6321 if (do_wakeup)
6322 wake_up_all(&nn->nfsd_ssc_waitq);
6323 spin_unlock(&nn->nfsd_ssc_lock);
6324 }
6325 #endif
6326
6327 /* Check if any lock belonging to this lockowner has any blockers */
6328 static bool
nfs4_lockowner_has_blockers(struct nfs4_lockowner * lo)6329 nfs4_lockowner_has_blockers(struct nfs4_lockowner *lo)
6330 {
6331 struct file_lock_context *ctx;
6332 struct nfs4_ol_stateid *stp;
6333 struct nfs4_file *nf;
6334
6335 list_for_each_entry(stp, &lo->lo_owner.so_stateids, st_perstateowner) {
6336 nf = stp->st_stid.sc_file;
6337 ctx = locks_inode_context(nf->fi_inode);
6338 if (!ctx)
6339 continue;
6340 if (locks_owner_has_blockers(ctx, lo))
6341 return true;
6342 }
6343 return false;
6344 }
6345
6346 static bool
nfs4_anylock_blockers(struct nfs4_client * clp)6347 nfs4_anylock_blockers(struct nfs4_client *clp)
6348 {
6349 int i;
6350 struct nfs4_stateowner *so;
6351 struct nfs4_lockowner *lo;
6352
6353 if (atomic_read(&clp->cl_delegs_in_recall))
6354 return true;
6355 spin_lock(&clp->cl_lock);
6356 for (i = 0; i < OWNER_HASH_SIZE; i++) {
6357 list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[i],
6358 so_strhash) {
6359 if (so->so_is_open_owner)
6360 continue;
6361 lo = lockowner(so);
6362 if (nfs4_lockowner_has_blockers(lo)) {
6363 spin_unlock(&clp->cl_lock);
6364 return true;
6365 }
6366 }
6367 }
6368 spin_unlock(&clp->cl_lock);
6369 return false;
6370 }
6371
6372 static void
nfs4_get_client_reaplist(struct nfsd_net * nn,struct list_head * reaplist,struct laundry_time * lt)6373 nfs4_get_client_reaplist(struct nfsd_net *nn, struct list_head *reaplist,
6374 struct laundry_time *lt)
6375 {
6376 unsigned int maxreap, reapcnt = 0;
6377 struct list_head *pos, *next;
6378 struct nfs4_client *clp;
6379
6380 maxreap = (atomic_read(&nn->nfs4_client_count) >= nn->nfs4_max_clients) ?
6381 NFSD_CLIENT_MAX_TRIM_PER_RUN : 0;
6382 INIT_LIST_HEAD(reaplist);
6383 spin_lock(&nn->client_lock);
6384 list_for_each_safe(pos, next, &nn->client_lru) {
6385 clp = list_entry(pos, struct nfs4_client, cl_lru);
6386 if (clp->cl_state == NFSD4_EXPIRABLE)
6387 goto exp_client;
6388 if (!state_expired(lt, clp->cl_time))
6389 break;
6390 if (!atomic_read(&clp->cl_rpc_users)) {
6391 if (clp->cl_state == NFSD4_ACTIVE)
6392 atomic_inc(&nn->nfsd_courtesy_clients);
6393 clp->cl_state = NFSD4_COURTESY;
6394 }
6395 if (!client_has_state(clp))
6396 goto exp_client;
6397 if (!nfs4_anylock_blockers(clp))
6398 if (reapcnt >= maxreap)
6399 continue;
6400 exp_client:
6401 if (!mark_client_expired_locked(clp)) {
6402 list_add(&clp->cl_lru, reaplist);
6403 reapcnt++;
6404 }
6405 }
6406 spin_unlock(&nn->client_lock);
6407 }
6408
6409 static void
nfs4_get_courtesy_client_reaplist(struct nfsd_net * nn,struct list_head * reaplist)6410 nfs4_get_courtesy_client_reaplist(struct nfsd_net *nn,
6411 struct list_head *reaplist)
6412 {
6413 unsigned int maxreap = 0, reapcnt = 0;
6414 struct list_head *pos, *next;
6415 struct nfs4_client *clp;
6416
6417 maxreap = NFSD_CLIENT_MAX_TRIM_PER_RUN;
6418 INIT_LIST_HEAD(reaplist);
6419
6420 spin_lock(&nn->client_lock);
6421 list_for_each_safe(pos, next, &nn->client_lru) {
6422 clp = list_entry(pos, struct nfs4_client, cl_lru);
6423 if (clp->cl_state == NFSD4_ACTIVE)
6424 break;
6425 if (reapcnt >= maxreap)
6426 break;
6427 if (!mark_client_expired_locked(clp)) {
6428 list_add(&clp->cl_lru, reaplist);
6429 reapcnt++;
6430 }
6431 }
6432 spin_unlock(&nn->client_lock);
6433 }
6434
6435 static void
nfs4_process_client_reaplist(struct list_head * reaplist)6436 nfs4_process_client_reaplist(struct list_head *reaplist)
6437 {
6438 struct list_head *pos, *next;
6439 struct nfs4_client *clp;
6440
6441 list_for_each_safe(pos, next, reaplist) {
6442 clp = list_entry(pos, struct nfs4_client, cl_lru);
6443 trace_nfsd_clid_purged(&clp->cl_clientid);
6444 list_del_init(&clp->cl_lru);
6445 expire_client(clp);
6446 }
6447 }
6448
nfs40_clean_admin_revoked(struct nfsd_net * nn,struct laundry_time * lt)6449 static void nfs40_clean_admin_revoked(struct nfsd_net *nn,
6450 struct laundry_time *lt)
6451 {
6452 struct nfs4_client *clp;
6453
6454 spin_lock(&nn->client_lock);
6455 if (nn->nfs40_last_revoke == 0 ||
6456 nn->nfs40_last_revoke > lt->cutoff) {
6457 spin_unlock(&nn->client_lock);
6458 return;
6459 }
6460 nn->nfs40_last_revoke = 0;
6461
6462 retry:
6463 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6464 unsigned long id, tmp;
6465 struct nfs4_stid *stid;
6466
6467 if (atomic_read(&clp->cl_admin_revoked) == 0)
6468 continue;
6469
6470 spin_lock(&clp->cl_lock);
6471 idr_for_each_entry_ul(&clp->cl_stateids, stid, tmp, id)
6472 if (stid->sc_status & SC_STATUS_ADMIN_REVOKED) {
6473 refcount_inc(&stid->sc_count);
6474 spin_unlock(&nn->client_lock);
6475 /* this function drops ->cl_lock */
6476 nfsd4_drop_revoked_stid(stid);
6477 nfs4_put_stid(stid);
6478 spin_lock(&nn->client_lock);
6479 goto retry;
6480 }
6481 spin_unlock(&clp->cl_lock);
6482 }
6483 spin_unlock(&nn->client_lock);
6484 }
6485
6486 static time64_t
nfs4_laundromat(struct nfsd_net * nn)6487 nfs4_laundromat(struct nfsd_net *nn)
6488 {
6489 struct nfs4_openowner *oo;
6490 struct nfs4_delegation *dp;
6491 struct nfs4_ol_stateid *stp;
6492 struct nfsd4_blocked_lock *nbl;
6493 struct list_head *pos, *next, reaplist;
6494 struct laundry_time lt = {
6495 .cutoff = ktime_get_boottime_seconds() - nn->nfsd4_lease,
6496 .new_timeo = nn->nfsd4_lease
6497 };
6498 struct nfs4_cpntf_state *cps;
6499 copy_stateid_t *cps_t;
6500 int i;
6501
6502 if (clients_still_reclaiming(nn)) {
6503 lt.new_timeo = 0;
6504 goto out;
6505 }
6506 nfsd4_end_grace(nn);
6507
6508 spin_lock(&nn->s2s_cp_lock);
6509 idr_for_each_entry(&nn->s2s_cp_stateids, cps_t, i) {
6510 cps = container_of(cps_t, struct nfs4_cpntf_state, cp_stateid);
6511 if (cps->cp_stateid.cs_type == NFS4_COPYNOTIFY_STID &&
6512 state_expired(<, cps->cpntf_time))
6513 _free_cpntf_state_locked(nn, cps);
6514 }
6515 spin_unlock(&nn->s2s_cp_lock);
6516 nfs4_get_client_reaplist(nn, &reaplist, <);
6517 nfs4_process_client_reaplist(&reaplist);
6518
6519 nfs40_clean_admin_revoked(nn, <);
6520
6521 spin_lock(&state_lock);
6522 list_for_each_safe(pos, next, &nn->del_recall_lru) {
6523 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
6524 if (!state_expired(<, dp->dl_time))
6525 break;
6526 unhash_delegation_locked(dp, SC_STATUS_REVOKED);
6527 list_add(&dp->dl_recall_lru, &reaplist);
6528 }
6529 spin_unlock(&state_lock);
6530 while (!list_empty(&reaplist)) {
6531 dp = list_first_entry(&reaplist, struct nfs4_delegation,
6532 dl_recall_lru);
6533 list_del_init(&dp->dl_recall_lru);
6534 revoke_delegation(dp);
6535 }
6536
6537 spin_lock(&nn->client_lock);
6538 while (!list_empty(&nn->close_lru)) {
6539 oo = list_first_entry(&nn->close_lru, struct nfs4_openowner,
6540 oo_close_lru);
6541 if (!state_expired(<, oo->oo_time))
6542 break;
6543 list_del_init(&oo->oo_close_lru);
6544 stp = oo->oo_last_closed_stid;
6545 oo->oo_last_closed_stid = NULL;
6546 spin_unlock(&nn->client_lock);
6547 nfs4_put_stid(&stp->st_stid);
6548 spin_lock(&nn->client_lock);
6549 }
6550 spin_unlock(&nn->client_lock);
6551
6552 /*
6553 * It's possible for a client to try and acquire an already held lock
6554 * that is being held for a long time, and then lose interest in it.
6555 * So, we clean out any un-revisited request after a lease period
6556 * under the assumption that the client is no longer interested.
6557 *
6558 * RFC5661, sec. 9.6 states that the client must not rely on getting
6559 * notifications and must continue to poll for locks, even when the
6560 * server supports them. Thus this shouldn't lead to clients blocking
6561 * indefinitely once the lock does become free.
6562 */
6563 BUG_ON(!list_empty(&reaplist));
6564 spin_lock(&nn->blocked_locks_lock);
6565 while (!list_empty(&nn->blocked_locks_lru)) {
6566 nbl = list_first_entry(&nn->blocked_locks_lru,
6567 struct nfsd4_blocked_lock, nbl_lru);
6568 if (!state_expired(<, nbl->nbl_time))
6569 break;
6570 list_move(&nbl->nbl_lru, &reaplist);
6571 list_del_init(&nbl->nbl_list);
6572 }
6573 spin_unlock(&nn->blocked_locks_lock);
6574
6575 while (!list_empty(&reaplist)) {
6576 nbl = list_first_entry(&reaplist,
6577 struct nfsd4_blocked_lock, nbl_lru);
6578 list_del_init(&nbl->nbl_lru);
6579 free_blocked_lock(nbl);
6580 }
6581 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
6582 /* service the server-to-server copy delayed unmount list */
6583 nfsd4_ssc_expire_umount(nn);
6584 #endif
6585 if (atomic_long_read(&num_delegations) >= max_delegations)
6586 deleg_reaper(nn);
6587 out:
6588 return max_t(time64_t, lt.new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
6589 }
6590
6591 static void laundromat_main(struct work_struct *);
6592
6593 static void
laundromat_main(struct work_struct * laundry)6594 laundromat_main(struct work_struct *laundry)
6595 {
6596 time64_t t;
6597 struct delayed_work *dwork = to_delayed_work(laundry);
6598 struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
6599 laundromat_work);
6600
6601 t = nfs4_laundromat(nn);
6602 queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
6603 }
6604
6605 static void
courtesy_client_reaper(struct nfsd_net * nn)6606 courtesy_client_reaper(struct nfsd_net *nn)
6607 {
6608 struct list_head reaplist;
6609
6610 nfs4_get_courtesy_client_reaplist(nn, &reaplist);
6611 nfs4_process_client_reaplist(&reaplist);
6612 }
6613
6614 static void
deleg_reaper(struct nfsd_net * nn)6615 deleg_reaper(struct nfsd_net *nn)
6616 {
6617 struct list_head *pos, *next;
6618 struct nfs4_client *clp;
6619 struct list_head cblist;
6620
6621 INIT_LIST_HEAD(&cblist);
6622 spin_lock(&nn->client_lock);
6623 list_for_each_safe(pos, next, &nn->client_lru) {
6624 clp = list_entry(pos, struct nfs4_client, cl_lru);
6625 if (clp->cl_state != NFSD4_ACTIVE ||
6626 list_empty(&clp->cl_delegations) ||
6627 atomic_read(&clp->cl_delegs_in_recall) ||
6628 test_bit(NFSD4_CLIENT_CB_RECALL_ANY, &clp->cl_flags) ||
6629 (ktime_get_boottime_seconds() -
6630 clp->cl_ra_time < 5)) {
6631 continue;
6632 }
6633 list_add(&clp->cl_ra_cblist, &cblist);
6634
6635 /* release in nfsd4_cb_recall_any_release */
6636 kref_get(&clp->cl_nfsdfs.cl_ref);
6637 set_bit(NFSD4_CLIENT_CB_RECALL_ANY, &clp->cl_flags);
6638 clp->cl_ra_time = ktime_get_boottime_seconds();
6639 }
6640 spin_unlock(&nn->client_lock);
6641
6642 while (!list_empty(&cblist)) {
6643 clp = list_first_entry(&cblist, struct nfs4_client,
6644 cl_ra_cblist);
6645 list_del_init(&clp->cl_ra_cblist);
6646 clp->cl_ra->ra_keep = 0;
6647 clp->cl_ra->ra_bmval[0] = BIT(RCA4_TYPE_MASK_RDATA_DLG);
6648 clp->cl_ra->ra_bmval[0] = BIT(RCA4_TYPE_MASK_RDATA_DLG) |
6649 BIT(RCA4_TYPE_MASK_WDATA_DLG);
6650 trace_nfsd_cb_recall_any(clp->cl_ra);
6651 nfsd4_run_cb(&clp->cl_ra->ra_cb);
6652 }
6653 }
6654
6655 static void
nfsd4_state_shrinker_worker(struct work_struct * work)6656 nfsd4_state_shrinker_worker(struct work_struct *work)
6657 {
6658 struct nfsd_net *nn = container_of(work, struct nfsd_net,
6659 nfsd_shrinker_work);
6660
6661 courtesy_client_reaper(nn);
6662 deleg_reaper(nn);
6663 }
6664
nfs4_check_fh(struct svc_fh * fhp,struct nfs4_stid * stp)6665 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stid *stp)
6666 {
6667 if (!fh_match(&fhp->fh_handle, &stp->sc_file->fi_fhandle))
6668 return nfserr_bad_stateid;
6669 return nfs_ok;
6670 }
6671
6672 static
nfs4_check_openmode(struct nfs4_ol_stateid * stp,int flags)6673 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
6674 {
6675 __be32 status = nfserr_openmode;
6676
6677 /* For lock stateid's, we test the parent open, not the lock: */
6678 if (stp->st_openstp)
6679 stp = stp->st_openstp;
6680 if ((flags & WR_STATE) && !access_permit_write(stp))
6681 goto out;
6682 if ((flags & RD_STATE) && !access_permit_read(stp))
6683 goto out;
6684 status = nfs_ok;
6685 out:
6686 return status;
6687 }
6688
6689 static inline __be32
check_special_stateids(struct net * net,svc_fh * current_fh,stateid_t * stateid,int flags)6690 check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
6691 {
6692 if (ONE_STATEID(stateid) && (flags & RD_STATE))
6693 return nfs_ok;
6694 else if (opens_in_grace(net)) {
6695 /* Answer in remaining cases depends on existence of
6696 * conflicting state; so we must wait out the grace period. */
6697 return nfserr_grace;
6698 } else if (flags & WR_STATE)
6699 return nfs4_share_conflict(current_fh,
6700 NFS4_SHARE_DENY_WRITE);
6701 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
6702 return nfs4_share_conflict(current_fh,
6703 NFS4_SHARE_DENY_READ);
6704 }
6705
check_stateid_generation(stateid_t * in,stateid_t * ref,bool has_session)6706 static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
6707 {
6708 /*
6709 * When sessions are used the stateid generation number is ignored
6710 * when it is zero.
6711 */
6712 if (has_session && in->si_generation == 0)
6713 return nfs_ok;
6714
6715 if (in->si_generation == ref->si_generation)
6716 return nfs_ok;
6717
6718 /* If the client sends us a stateid from the future, it's buggy: */
6719 if (nfsd4_stateid_generation_after(in, ref))
6720 return nfserr_bad_stateid;
6721 /*
6722 * However, we could see a stateid from the past, even from a
6723 * non-buggy client. For example, if the client sends a lock
6724 * while some IO is outstanding, the lock may bump si_generation
6725 * while the IO is still in flight. The client could avoid that
6726 * situation by waiting for responses on all the IO requests,
6727 * but better performance may result in retrying IO that
6728 * receives an old_stateid error if requests are rarely
6729 * reordered in flight:
6730 */
6731 return nfserr_old_stateid;
6732 }
6733
nfsd4_stid_check_stateid_generation(stateid_t * in,struct nfs4_stid * s,bool has_session)6734 static __be32 nfsd4_stid_check_stateid_generation(stateid_t *in, struct nfs4_stid *s, bool has_session)
6735 {
6736 __be32 ret;
6737
6738 spin_lock(&s->sc_lock);
6739 ret = nfsd4_verify_open_stid(s);
6740 if (ret == nfs_ok)
6741 ret = check_stateid_generation(in, &s->sc_stateid, has_session);
6742 spin_unlock(&s->sc_lock);
6743 if (ret == nfserr_admin_revoked)
6744 nfsd40_drop_revoked_stid(s->sc_client,
6745 &s->sc_stateid);
6746 return ret;
6747 }
6748
nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid * ols)6749 static __be32 nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid *ols)
6750 {
6751 if (ols->st_stateowner->so_is_open_owner &&
6752 !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
6753 return nfserr_bad_stateid;
6754 return nfs_ok;
6755 }
6756
nfsd4_validate_stateid(struct nfs4_client * cl,stateid_t * stateid)6757 static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
6758 {
6759 struct nfs4_stid *s;
6760 __be32 status = nfserr_bad_stateid;
6761
6762 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
6763 CLOSE_STATEID(stateid))
6764 return status;
6765 spin_lock(&cl->cl_lock);
6766 s = find_stateid_locked(cl, stateid);
6767 if (!s)
6768 goto out_unlock;
6769 status = nfsd4_stid_check_stateid_generation(stateid, s, 1);
6770 if (status)
6771 goto out_unlock;
6772 status = nfsd4_verify_open_stid(s);
6773 if (status)
6774 goto out_unlock;
6775
6776 switch (s->sc_type) {
6777 case SC_TYPE_DELEG:
6778 status = nfs_ok;
6779 break;
6780 case SC_TYPE_OPEN:
6781 case SC_TYPE_LOCK:
6782 status = nfsd4_check_openowner_confirmed(openlockstateid(s));
6783 break;
6784 default:
6785 printk("unknown stateid type %x\n", s->sc_type);
6786 status = nfserr_bad_stateid;
6787 }
6788 out_unlock:
6789 spin_unlock(&cl->cl_lock);
6790 if (status == nfserr_admin_revoked)
6791 nfsd40_drop_revoked_stid(cl, stateid);
6792 return status;
6793 }
6794
6795 __be32
nfsd4_lookup_stateid(struct nfsd4_compound_state * cstate,stateid_t * stateid,unsigned short typemask,unsigned short statusmask,struct nfs4_stid ** s,struct nfsd_net * nn)6796 nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
6797 stateid_t *stateid,
6798 unsigned short typemask, unsigned short statusmask,
6799 struct nfs4_stid **s, struct nfsd_net *nn)
6800 {
6801 __be32 status;
6802 struct nfs4_stid *stid;
6803 bool return_revoked = false;
6804
6805 /*
6806 * only return revoked delegations if explicitly asked.
6807 * otherwise we report revoked or bad_stateid status.
6808 */
6809 if (statusmask & SC_STATUS_REVOKED)
6810 return_revoked = true;
6811 if (typemask & SC_TYPE_DELEG)
6812 /* Always allow REVOKED for DELEG so we can
6813 * retturn the appropriate error.
6814 */
6815 statusmask |= SC_STATUS_REVOKED;
6816
6817 statusmask |= SC_STATUS_ADMIN_REVOKED;
6818
6819 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
6820 CLOSE_STATEID(stateid))
6821 return nfserr_bad_stateid;
6822 status = set_client(&stateid->si_opaque.so_clid, cstate, nn);
6823 if (status == nfserr_stale_clientid) {
6824 if (cstate->session)
6825 return nfserr_bad_stateid;
6826 return nfserr_stale_stateid;
6827 }
6828 if (status)
6829 return status;
6830 stid = find_stateid_by_type(cstate->clp, stateid, typemask, statusmask);
6831 if (!stid)
6832 return nfserr_bad_stateid;
6833 if ((stid->sc_status & SC_STATUS_REVOKED) && !return_revoked) {
6834 nfs4_put_stid(stid);
6835 return nfserr_deleg_revoked;
6836 }
6837 if (stid->sc_status & SC_STATUS_ADMIN_REVOKED) {
6838 nfsd40_drop_revoked_stid(cstate->clp, stateid);
6839 nfs4_put_stid(stid);
6840 return nfserr_admin_revoked;
6841 }
6842 *s = stid;
6843 return nfs_ok;
6844 }
6845
6846 static struct nfsd_file *
nfs4_find_file(struct nfs4_stid * s,int flags)6847 nfs4_find_file(struct nfs4_stid *s, int flags)
6848 {
6849 struct nfsd_file *ret = NULL;
6850
6851 if (!s || s->sc_status)
6852 return NULL;
6853
6854 switch (s->sc_type) {
6855 case SC_TYPE_DELEG:
6856 spin_lock(&s->sc_file->fi_lock);
6857 ret = nfsd_file_get(s->sc_file->fi_deleg_file);
6858 spin_unlock(&s->sc_file->fi_lock);
6859 break;
6860 case SC_TYPE_OPEN:
6861 case SC_TYPE_LOCK:
6862 if (flags & RD_STATE)
6863 ret = find_readable_file(s->sc_file);
6864 else
6865 ret = find_writeable_file(s->sc_file);
6866 }
6867
6868 return ret;
6869 }
6870
6871 static __be32
nfs4_check_olstateid(struct nfs4_ol_stateid * ols,int flags)6872 nfs4_check_olstateid(struct nfs4_ol_stateid *ols, int flags)
6873 {
6874 __be32 status;
6875
6876 status = nfsd4_check_openowner_confirmed(ols);
6877 if (status)
6878 return status;
6879 return nfs4_check_openmode(ols, flags);
6880 }
6881
6882 static __be32
nfs4_check_file(struct svc_rqst * rqstp,struct svc_fh * fhp,struct nfs4_stid * s,struct nfsd_file ** nfp,int flags)6883 nfs4_check_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfs4_stid *s,
6884 struct nfsd_file **nfp, int flags)
6885 {
6886 int acc = (flags & RD_STATE) ? NFSD_MAY_READ : NFSD_MAY_WRITE;
6887 struct nfsd_file *nf;
6888 __be32 status;
6889
6890 nf = nfs4_find_file(s, flags);
6891 if (nf) {
6892 status = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
6893 acc | NFSD_MAY_OWNER_OVERRIDE);
6894 if (status) {
6895 nfsd_file_put(nf);
6896 goto out;
6897 }
6898 } else {
6899 status = nfsd_file_acquire(rqstp, fhp, acc, &nf);
6900 if (status)
6901 return status;
6902 }
6903 *nfp = nf;
6904 out:
6905 return status;
6906 }
6907 static void
_free_cpntf_state_locked(struct nfsd_net * nn,struct nfs4_cpntf_state * cps)6908 _free_cpntf_state_locked(struct nfsd_net *nn, struct nfs4_cpntf_state *cps)
6909 {
6910 WARN_ON_ONCE(cps->cp_stateid.cs_type != NFS4_COPYNOTIFY_STID);
6911 if (!refcount_dec_and_test(&cps->cp_stateid.cs_count))
6912 return;
6913 list_del(&cps->cp_list);
6914 idr_remove(&nn->s2s_cp_stateids,
6915 cps->cp_stateid.cs_stid.si_opaque.so_id);
6916 kfree(cps);
6917 }
6918 /*
6919 * A READ from an inter server to server COPY will have a
6920 * copy stateid. Look up the copy notify stateid from the
6921 * idr structure and take a reference on it.
6922 */
manage_cpntf_state(struct nfsd_net * nn,stateid_t * st,struct nfs4_client * clp,struct nfs4_cpntf_state ** cps)6923 __be32 manage_cpntf_state(struct nfsd_net *nn, stateid_t *st,
6924 struct nfs4_client *clp,
6925 struct nfs4_cpntf_state **cps)
6926 {
6927 copy_stateid_t *cps_t;
6928 struct nfs4_cpntf_state *state = NULL;
6929
6930 if (st->si_opaque.so_clid.cl_id != nn->s2s_cp_cl_id)
6931 return nfserr_bad_stateid;
6932 spin_lock(&nn->s2s_cp_lock);
6933 cps_t = idr_find(&nn->s2s_cp_stateids, st->si_opaque.so_id);
6934 if (cps_t) {
6935 state = container_of(cps_t, struct nfs4_cpntf_state,
6936 cp_stateid);
6937 if (state->cp_stateid.cs_type != NFS4_COPYNOTIFY_STID) {
6938 state = NULL;
6939 goto unlock;
6940 }
6941 if (!clp)
6942 refcount_inc(&state->cp_stateid.cs_count);
6943 else
6944 _free_cpntf_state_locked(nn, state);
6945 }
6946 unlock:
6947 spin_unlock(&nn->s2s_cp_lock);
6948 if (!state)
6949 return nfserr_bad_stateid;
6950 if (!clp)
6951 *cps = state;
6952 return 0;
6953 }
6954
find_cpntf_state(struct nfsd_net * nn,stateid_t * st,struct nfs4_stid ** stid)6955 static __be32 find_cpntf_state(struct nfsd_net *nn, stateid_t *st,
6956 struct nfs4_stid **stid)
6957 {
6958 __be32 status;
6959 struct nfs4_cpntf_state *cps = NULL;
6960 struct nfs4_client *found;
6961
6962 status = manage_cpntf_state(nn, st, NULL, &cps);
6963 if (status)
6964 return status;
6965
6966 cps->cpntf_time = ktime_get_boottime_seconds();
6967
6968 status = nfserr_expired;
6969 found = lookup_clientid(&cps->cp_p_clid, true, nn);
6970 if (!found)
6971 goto out;
6972
6973 *stid = find_stateid_by_type(found, &cps->cp_p_stateid,
6974 SC_TYPE_DELEG|SC_TYPE_OPEN|SC_TYPE_LOCK,
6975 0);
6976 if (*stid)
6977 status = nfs_ok;
6978 else
6979 status = nfserr_bad_stateid;
6980
6981 put_client_renew(found);
6982 out:
6983 nfs4_put_cpntf_state(nn, cps);
6984 return status;
6985 }
6986
nfs4_put_cpntf_state(struct nfsd_net * nn,struct nfs4_cpntf_state * cps)6987 void nfs4_put_cpntf_state(struct nfsd_net *nn, struct nfs4_cpntf_state *cps)
6988 {
6989 spin_lock(&nn->s2s_cp_lock);
6990 _free_cpntf_state_locked(nn, cps);
6991 spin_unlock(&nn->s2s_cp_lock);
6992 }
6993
6994 /**
6995 * nfs4_preprocess_stateid_op - find and prep stateid for an operation
6996 * @rqstp: incoming request from client
6997 * @cstate: current compound state
6998 * @fhp: filehandle associated with requested stateid
6999 * @stateid: stateid (provided by client)
7000 * @flags: flags describing type of operation to be done
7001 * @nfp: optional nfsd_file return pointer (may be NULL)
7002 * @cstid: optional returned nfs4_stid pointer (may be NULL)
7003 *
7004 * Given info from the client, look up a nfs4_stid for the operation. On
7005 * success, it returns a reference to the nfs4_stid and/or the nfsd_file
7006 * associated with it.
7007 */
7008 __be32
nfs4_preprocess_stateid_op(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,struct svc_fh * fhp,stateid_t * stateid,int flags,struct nfsd_file ** nfp,struct nfs4_stid ** cstid)7009 nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
7010 struct nfsd4_compound_state *cstate, struct svc_fh *fhp,
7011 stateid_t *stateid, int flags, struct nfsd_file **nfp,
7012 struct nfs4_stid **cstid)
7013 {
7014 struct net *net = SVC_NET(rqstp);
7015 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7016 struct nfs4_stid *s = NULL;
7017 __be32 status;
7018
7019 if (nfp)
7020 *nfp = NULL;
7021
7022 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
7023 if (cstid)
7024 status = nfserr_bad_stateid;
7025 else
7026 status = check_special_stateids(net, fhp, stateid,
7027 flags);
7028 goto done;
7029 }
7030
7031 status = nfsd4_lookup_stateid(cstate, stateid,
7032 SC_TYPE_DELEG|SC_TYPE_OPEN|SC_TYPE_LOCK,
7033 0, &s, nn);
7034 if (status == nfserr_bad_stateid)
7035 status = find_cpntf_state(nn, stateid, &s);
7036 if (status)
7037 return status;
7038 status = nfsd4_stid_check_stateid_generation(stateid, s,
7039 nfsd4_has_session(cstate));
7040 if (status)
7041 goto out;
7042
7043 switch (s->sc_type) {
7044 case SC_TYPE_DELEG:
7045 status = nfs4_check_delegmode(delegstateid(s), flags);
7046 break;
7047 case SC_TYPE_OPEN:
7048 case SC_TYPE_LOCK:
7049 status = nfs4_check_olstateid(openlockstateid(s), flags);
7050 break;
7051 }
7052 if (status)
7053 goto out;
7054 status = nfs4_check_fh(fhp, s);
7055
7056 done:
7057 if (status == nfs_ok && nfp)
7058 status = nfs4_check_file(rqstp, fhp, s, nfp, flags);
7059 out:
7060 if (s) {
7061 if (!status && cstid)
7062 *cstid = s;
7063 else
7064 nfs4_put_stid(s);
7065 }
7066 return status;
7067 }
7068
7069 /*
7070 * Test if the stateid is valid
7071 */
7072 __be32
nfsd4_test_stateid(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7073 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7074 union nfsd4_op_u *u)
7075 {
7076 struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
7077 struct nfsd4_test_stateid_id *stateid;
7078 struct nfs4_client *cl = cstate->clp;
7079
7080 list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
7081 stateid->ts_id_status =
7082 nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
7083
7084 return nfs_ok;
7085 }
7086
7087 static __be32
nfsd4_free_lock_stateid(stateid_t * stateid,struct nfs4_stid * s)7088 nfsd4_free_lock_stateid(stateid_t *stateid, struct nfs4_stid *s)
7089 {
7090 struct nfs4_ol_stateid *stp = openlockstateid(s);
7091 __be32 ret;
7092
7093 ret = nfsd4_lock_ol_stateid(stp);
7094 if (ret)
7095 goto out_put_stid;
7096
7097 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
7098 if (ret)
7099 goto out;
7100
7101 ret = nfserr_locks_held;
7102 if (check_for_locks(stp->st_stid.sc_file,
7103 lockowner(stp->st_stateowner)))
7104 goto out;
7105
7106 release_lock_stateid(stp);
7107 ret = nfs_ok;
7108
7109 out:
7110 mutex_unlock(&stp->st_mutex);
7111 out_put_stid:
7112 nfs4_put_stid(s);
7113 return ret;
7114 }
7115
7116 __be32
nfsd4_free_stateid(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7117 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7118 union nfsd4_op_u *u)
7119 {
7120 struct nfsd4_free_stateid *free_stateid = &u->free_stateid;
7121 stateid_t *stateid = &free_stateid->fr_stateid;
7122 struct nfs4_stid *s;
7123 struct nfs4_delegation *dp;
7124 struct nfs4_client *cl = cstate->clp;
7125 __be32 ret = nfserr_bad_stateid;
7126
7127 spin_lock(&cl->cl_lock);
7128 s = find_stateid_locked(cl, stateid);
7129 if (!s || s->sc_status & SC_STATUS_CLOSED)
7130 goto out_unlock;
7131 if (s->sc_status & SC_STATUS_ADMIN_REVOKED) {
7132 nfsd4_drop_revoked_stid(s);
7133 ret = nfs_ok;
7134 goto out;
7135 }
7136 spin_lock(&s->sc_lock);
7137 switch (s->sc_type) {
7138 case SC_TYPE_DELEG:
7139 if (s->sc_status & SC_STATUS_REVOKED) {
7140 spin_unlock(&s->sc_lock);
7141 dp = delegstateid(s);
7142 list_del_init(&dp->dl_recall_lru);
7143 spin_unlock(&cl->cl_lock);
7144 nfs4_put_stid(s);
7145 ret = nfs_ok;
7146 goto out;
7147 }
7148 ret = nfserr_locks_held;
7149 break;
7150 case SC_TYPE_OPEN:
7151 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
7152 if (ret)
7153 break;
7154 ret = nfserr_locks_held;
7155 break;
7156 case SC_TYPE_LOCK:
7157 spin_unlock(&s->sc_lock);
7158 refcount_inc(&s->sc_count);
7159 spin_unlock(&cl->cl_lock);
7160 ret = nfsd4_free_lock_stateid(stateid, s);
7161 goto out;
7162 }
7163 spin_unlock(&s->sc_lock);
7164 out_unlock:
7165 spin_unlock(&cl->cl_lock);
7166 out:
7167 return ret;
7168 }
7169
7170 static inline int
setlkflg(int type)7171 setlkflg (int type)
7172 {
7173 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
7174 RD_STATE : WR_STATE;
7175 }
7176
nfs4_seqid_op_checks(struct nfsd4_compound_state * cstate,stateid_t * stateid,u32 seqid,struct nfs4_ol_stateid * stp)7177 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
7178 {
7179 struct svc_fh *current_fh = &cstate->current_fh;
7180 struct nfs4_stateowner *sop = stp->st_stateowner;
7181 __be32 status;
7182
7183 status = nfsd4_check_seqid(cstate, sop, seqid);
7184 if (status)
7185 return status;
7186 status = nfsd4_lock_ol_stateid(stp);
7187 if (status != nfs_ok)
7188 return status;
7189 status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
7190 if (status == nfs_ok)
7191 status = nfs4_check_fh(current_fh, &stp->st_stid);
7192 if (status != nfs_ok)
7193 mutex_unlock(&stp->st_mutex);
7194 return status;
7195 }
7196
7197 /**
7198 * nfs4_preprocess_seqid_op - find and prep an ol_stateid for a seqid-morphing op
7199 * @cstate: compund state
7200 * @seqid: seqid (provided by client)
7201 * @stateid: stateid (provided by client)
7202 * @typemask: mask of allowable types for this operation
7203 * @statusmask: mask of allowed states: 0 or STID_CLOSED
7204 * @stpp: return pointer for the stateid found
7205 * @nn: net namespace for request
7206 *
7207 * Given a stateid+seqid from a client, look up an nfs4_ol_stateid and
7208 * return it in @stpp. On a nfs_ok return, the returned stateid will
7209 * have its st_mutex locked.
7210 */
7211 static __be32
nfs4_preprocess_seqid_op(struct nfsd4_compound_state * cstate,u32 seqid,stateid_t * stateid,unsigned short typemask,unsigned short statusmask,struct nfs4_ol_stateid ** stpp,struct nfsd_net * nn)7212 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
7213 stateid_t *stateid,
7214 unsigned short typemask, unsigned short statusmask,
7215 struct nfs4_ol_stateid **stpp,
7216 struct nfsd_net *nn)
7217 {
7218 __be32 status;
7219 struct nfs4_stid *s;
7220 struct nfs4_ol_stateid *stp = NULL;
7221
7222 trace_nfsd_preprocess(seqid, stateid);
7223
7224 *stpp = NULL;
7225 retry:
7226 status = nfsd4_lookup_stateid(cstate, stateid,
7227 typemask, statusmask, &s, nn);
7228 if (status)
7229 return status;
7230 stp = openlockstateid(s);
7231 if (nfsd4_cstate_assign_replay(cstate, stp->st_stateowner) == -EAGAIN) {
7232 nfs4_put_stateowner(stp->st_stateowner);
7233 goto retry;
7234 }
7235
7236 status = nfs4_seqid_op_checks(cstate, stateid, seqid, stp);
7237 if (!status)
7238 *stpp = stp;
7239 else
7240 nfs4_put_stid(&stp->st_stid);
7241 return status;
7242 }
7243
nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state * cstate,u32 seqid,stateid_t * stateid,struct nfs4_ol_stateid ** stpp,struct nfsd_net * nn)7244 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
7245 stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
7246 {
7247 __be32 status;
7248 struct nfs4_openowner *oo;
7249 struct nfs4_ol_stateid *stp;
7250
7251 status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
7252 SC_TYPE_OPEN, 0, &stp, nn);
7253 if (status)
7254 return status;
7255 oo = openowner(stp->st_stateowner);
7256 if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
7257 mutex_unlock(&stp->st_mutex);
7258 nfs4_put_stid(&stp->st_stid);
7259 return nfserr_bad_stateid;
7260 }
7261 *stpp = stp;
7262 return nfs_ok;
7263 }
7264
7265 __be32
nfsd4_open_confirm(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7266 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7267 union nfsd4_op_u *u)
7268 {
7269 struct nfsd4_open_confirm *oc = &u->open_confirm;
7270 __be32 status;
7271 struct nfs4_openowner *oo;
7272 struct nfs4_ol_stateid *stp;
7273 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
7274
7275 dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
7276 cstate->current_fh.fh_dentry);
7277
7278 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
7279 if (status)
7280 return status;
7281
7282 status = nfs4_preprocess_seqid_op(cstate,
7283 oc->oc_seqid, &oc->oc_req_stateid,
7284 SC_TYPE_OPEN, 0, &stp, nn);
7285 if (status)
7286 goto out;
7287 oo = openowner(stp->st_stateowner);
7288 status = nfserr_bad_stateid;
7289 if (oo->oo_flags & NFS4_OO_CONFIRMED) {
7290 mutex_unlock(&stp->st_mutex);
7291 goto put_stateid;
7292 }
7293 oo->oo_flags |= NFS4_OO_CONFIRMED;
7294 nfs4_inc_and_copy_stateid(&oc->oc_resp_stateid, &stp->st_stid);
7295 mutex_unlock(&stp->st_mutex);
7296 trace_nfsd_open_confirm(oc->oc_seqid, &stp->st_stid.sc_stateid);
7297 nfsd4_client_record_create(oo->oo_owner.so_client);
7298 status = nfs_ok;
7299 put_stateid:
7300 nfs4_put_stid(&stp->st_stid);
7301 out:
7302 nfsd4_bump_seqid(cstate, status);
7303 return status;
7304 }
7305
nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid * stp,u32 access)7306 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
7307 {
7308 if (!test_access(access, stp))
7309 return;
7310 nfs4_file_put_access(stp->st_stid.sc_file, access);
7311 clear_access(access, stp);
7312 }
7313
nfs4_stateid_downgrade(struct nfs4_ol_stateid * stp,u32 to_access)7314 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
7315 {
7316 switch (to_access) {
7317 case NFS4_SHARE_ACCESS_READ:
7318 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
7319 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
7320 break;
7321 case NFS4_SHARE_ACCESS_WRITE:
7322 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
7323 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
7324 break;
7325 case NFS4_SHARE_ACCESS_BOTH:
7326 break;
7327 default:
7328 WARN_ON_ONCE(1);
7329 }
7330 }
7331
7332 __be32
nfsd4_open_downgrade(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7333 nfsd4_open_downgrade(struct svc_rqst *rqstp,
7334 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
7335 {
7336 struct nfsd4_open_downgrade *od = &u->open_downgrade;
7337 __be32 status;
7338 struct nfs4_ol_stateid *stp;
7339 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
7340
7341 dprintk("NFSD: nfsd4_open_downgrade on file %pd\n",
7342 cstate->current_fh.fh_dentry);
7343
7344 /* We don't yet support WANT bits: */
7345 if (od->od_deleg_want)
7346 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
7347 od->od_deleg_want);
7348
7349 status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
7350 &od->od_stateid, &stp, nn);
7351 if (status)
7352 goto out;
7353 status = nfserr_inval;
7354 if (!test_access(od->od_share_access, stp)) {
7355 dprintk("NFSD: access not a subset of current bitmap: 0x%hhx, input access=%08x\n",
7356 stp->st_access_bmap, od->od_share_access);
7357 goto put_stateid;
7358 }
7359 if (!test_deny(od->od_share_deny, stp)) {
7360 dprintk("NFSD: deny not a subset of current bitmap: 0x%hhx, input deny=%08x\n",
7361 stp->st_deny_bmap, od->od_share_deny);
7362 goto put_stateid;
7363 }
7364 nfs4_stateid_downgrade(stp, od->od_share_access);
7365 reset_union_bmap_deny(od->od_share_deny, stp);
7366 nfs4_inc_and_copy_stateid(&od->od_stateid, &stp->st_stid);
7367 status = nfs_ok;
7368 put_stateid:
7369 mutex_unlock(&stp->st_mutex);
7370 nfs4_put_stid(&stp->st_stid);
7371 out:
7372 nfsd4_bump_seqid(cstate, status);
7373 return status;
7374 }
7375
nfsd4_close_open_stateid(struct nfs4_ol_stateid * s)7376 static bool nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
7377 {
7378 struct nfs4_client *clp = s->st_stid.sc_client;
7379 bool unhashed;
7380 LIST_HEAD(reaplist);
7381 struct nfs4_ol_stateid *stp;
7382
7383 spin_lock(&clp->cl_lock);
7384 unhashed = unhash_open_stateid(s, &reaplist);
7385
7386 if (clp->cl_minorversion) {
7387 if (unhashed)
7388 put_ol_stateid_locked(s, &reaplist);
7389 spin_unlock(&clp->cl_lock);
7390 list_for_each_entry(stp, &reaplist, st_locks)
7391 nfs4_free_cpntf_statelist(clp->net, &stp->st_stid);
7392 free_ol_stateid_reaplist(&reaplist);
7393 return false;
7394 } else {
7395 spin_unlock(&clp->cl_lock);
7396 free_ol_stateid_reaplist(&reaplist);
7397 return unhashed;
7398 }
7399 }
7400
7401 /*
7402 * nfs4_unlock_state() called after encode
7403 */
7404 __be32
nfsd4_close(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7405 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7406 union nfsd4_op_u *u)
7407 {
7408 struct nfsd4_close *close = &u->close;
7409 __be32 status;
7410 struct nfs4_ol_stateid *stp;
7411 struct net *net = SVC_NET(rqstp);
7412 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7413 bool need_move_to_close_list;
7414
7415 dprintk("NFSD: nfsd4_close on file %pd\n",
7416 cstate->current_fh.fh_dentry);
7417
7418 status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
7419 &close->cl_stateid,
7420 SC_TYPE_OPEN, SC_STATUS_CLOSED,
7421 &stp, nn);
7422 nfsd4_bump_seqid(cstate, status);
7423 if (status)
7424 goto out;
7425
7426 spin_lock(&stp->st_stid.sc_client->cl_lock);
7427 stp->st_stid.sc_status |= SC_STATUS_CLOSED;
7428 spin_unlock(&stp->st_stid.sc_client->cl_lock);
7429
7430 /*
7431 * Technically we don't _really_ have to increment or copy it, since
7432 * it should just be gone after this operation and we clobber the
7433 * copied value below, but we continue to do so here just to ensure
7434 * that racing ops see that there was a state change.
7435 */
7436 nfs4_inc_and_copy_stateid(&close->cl_stateid, &stp->st_stid);
7437
7438 need_move_to_close_list = nfsd4_close_open_stateid(stp);
7439 mutex_unlock(&stp->st_mutex);
7440 if (need_move_to_close_list)
7441 move_to_close_lru(stp, net);
7442
7443 /* v4.1+ suggests that we send a special stateid in here, since the
7444 * clients should just ignore this anyway. Since this is not useful
7445 * for v4.0 clients either, we set it to the special close_stateid
7446 * universally.
7447 *
7448 * See RFC5661 section 18.2.4, and RFC7530 section 16.2.5
7449 */
7450 memcpy(&close->cl_stateid, &close_stateid, sizeof(close->cl_stateid));
7451
7452 /* put reference from nfs4_preprocess_seqid_op */
7453 nfs4_put_stid(&stp->st_stid);
7454 out:
7455 return status;
7456 }
7457
7458 __be32
nfsd4_delegreturn(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7459 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7460 union nfsd4_op_u *u)
7461 {
7462 struct nfsd4_delegreturn *dr = &u->delegreturn;
7463 struct nfs4_delegation *dp;
7464 stateid_t *stateid = &dr->dr_stateid;
7465 struct nfs4_stid *s;
7466 __be32 status;
7467 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
7468
7469 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
7470 return status;
7471
7472 status = nfsd4_lookup_stateid(cstate, stateid, SC_TYPE_DELEG, 0, &s, nn);
7473 if (status)
7474 goto out;
7475 dp = delegstateid(s);
7476 status = nfsd4_stid_check_stateid_generation(stateid, &dp->dl_stid, nfsd4_has_session(cstate));
7477 if (status)
7478 goto put_stateid;
7479
7480 trace_nfsd_deleg_return(stateid);
7481 wake_up_var(d_inode(cstate->current_fh.fh_dentry));
7482 destroy_delegation(dp);
7483 put_stateid:
7484 nfs4_put_stid(&dp->dl_stid);
7485 out:
7486 return status;
7487 }
7488
7489 /* last octet in a range */
7490 static inline u64
last_byte_offset(u64 start,u64 len)7491 last_byte_offset(u64 start, u64 len)
7492 {
7493 u64 end;
7494
7495 WARN_ON_ONCE(!len);
7496 end = start + len;
7497 return end > start ? end - 1: NFS4_MAX_UINT64;
7498 }
7499
7500 /*
7501 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
7502 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
7503 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
7504 * locking, this prevents us from being completely protocol-compliant. The
7505 * real solution to this problem is to start using unsigned file offsets in
7506 * the VFS, but this is a very deep change!
7507 */
7508 static inline void
nfs4_transform_lock_offset(struct file_lock * lock)7509 nfs4_transform_lock_offset(struct file_lock *lock)
7510 {
7511 if (lock->fl_start < 0)
7512 lock->fl_start = OFFSET_MAX;
7513 if (lock->fl_end < 0)
7514 lock->fl_end = OFFSET_MAX;
7515 }
7516
7517 static fl_owner_t
nfsd4_lm_get_owner(fl_owner_t owner)7518 nfsd4_lm_get_owner(fl_owner_t owner)
7519 {
7520 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
7521
7522 nfs4_get_stateowner(&lo->lo_owner);
7523 return owner;
7524 }
7525
7526 static void
nfsd4_lm_put_owner(fl_owner_t owner)7527 nfsd4_lm_put_owner(fl_owner_t owner)
7528 {
7529 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
7530
7531 if (lo)
7532 nfs4_put_stateowner(&lo->lo_owner);
7533 }
7534
7535 /* return pointer to struct nfs4_client if client is expirable */
7536 static bool
nfsd4_lm_lock_expirable(struct file_lock * cfl)7537 nfsd4_lm_lock_expirable(struct file_lock *cfl)
7538 {
7539 struct nfs4_lockowner *lo = (struct nfs4_lockowner *) cfl->c.flc_owner;
7540 struct nfs4_client *clp = lo->lo_owner.so_client;
7541 struct nfsd_net *nn;
7542
7543 if (try_to_expire_client(clp)) {
7544 nn = net_generic(clp->net, nfsd_net_id);
7545 mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
7546 return true;
7547 }
7548 return false;
7549 }
7550
7551 /* schedule laundromat to run immediately and wait for it to complete */
7552 static void
nfsd4_lm_expire_lock(void)7553 nfsd4_lm_expire_lock(void)
7554 {
7555 flush_workqueue(laundry_wq);
7556 }
7557
7558 static void
nfsd4_lm_notify(struct file_lock * fl)7559 nfsd4_lm_notify(struct file_lock *fl)
7560 {
7561 struct nfs4_lockowner *lo = (struct nfs4_lockowner *) fl->c.flc_owner;
7562 struct net *net = lo->lo_owner.so_client->net;
7563 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7564 struct nfsd4_blocked_lock *nbl = container_of(fl,
7565 struct nfsd4_blocked_lock, nbl_lock);
7566 bool queue = false;
7567
7568 /* An empty list means that something else is going to be using it */
7569 spin_lock(&nn->blocked_locks_lock);
7570 if (!list_empty(&nbl->nbl_list)) {
7571 list_del_init(&nbl->nbl_list);
7572 list_del_init(&nbl->nbl_lru);
7573 queue = true;
7574 }
7575 spin_unlock(&nn->blocked_locks_lock);
7576
7577 if (queue) {
7578 trace_nfsd_cb_notify_lock(lo, nbl);
7579 nfsd4_run_cb(&nbl->nbl_cb);
7580 }
7581 }
7582
7583 static const struct lock_manager_operations nfsd_posix_mng_ops = {
7584 .lm_mod_owner = THIS_MODULE,
7585 .lm_notify = nfsd4_lm_notify,
7586 .lm_get_owner = nfsd4_lm_get_owner,
7587 .lm_put_owner = nfsd4_lm_put_owner,
7588 .lm_lock_expirable = nfsd4_lm_lock_expirable,
7589 .lm_expire_lock = nfsd4_lm_expire_lock,
7590 };
7591
7592 static inline void
nfs4_set_lock_denied(struct file_lock * fl,struct nfsd4_lock_denied * deny)7593 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
7594 {
7595 struct nfs4_lockowner *lo;
7596
7597 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
7598 lo = (struct nfs4_lockowner *) fl->c.flc_owner;
7599 xdr_netobj_dup(&deny->ld_owner, &lo->lo_owner.so_owner,
7600 GFP_KERNEL);
7601 if (!deny->ld_owner.data)
7602 /* We just don't care that much */
7603 goto nevermind;
7604 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
7605 } else {
7606 nevermind:
7607 deny->ld_owner.len = 0;
7608 deny->ld_owner.data = NULL;
7609 deny->ld_clientid.cl_boot = 0;
7610 deny->ld_clientid.cl_id = 0;
7611 }
7612 deny->ld_start = fl->fl_start;
7613 deny->ld_length = NFS4_MAX_UINT64;
7614 if (fl->fl_end != NFS4_MAX_UINT64)
7615 deny->ld_length = fl->fl_end - fl->fl_start + 1;
7616 deny->ld_type = NFS4_READ_LT;
7617 if (fl->c.flc_type != F_RDLCK)
7618 deny->ld_type = NFS4_WRITE_LT;
7619 }
7620
7621 static struct nfs4_lockowner *
find_lockowner_str_locked(struct nfs4_client * clp,struct xdr_netobj * owner)7622 find_lockowner_str_locked(struct nfs4_client *clp, struct xdr_netobj *owner)
7623 {
7624 unsigned int strhashval = ownerstr_hashval(owner);
7625 struct nfs4_stateowner *so;
7626
7627 lockdep_assert_held(&clp->cl_lock);
7628
7629 list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[strhashval],
7630 so_strhash) {
7631 if (so->so_is_open_owner)
7632 continue;
7633 if (same_owner_str(so, owner))
7634 return lockowner(nfs4_get_stateowner(so));
7635 }
7636 return NULL;
7637 }
7638
7639 static struct nfs4_lockowner *
find_lockowner_str(struct nfs4_client * clp,struct xdr_netobj * owner)7640 find_lockowner_str(struct nfs4_client *clp, struct xdr_netobj *owner)
7641 {
7642 struct nfs4_lockowner *lo;
7643
7644 spin_lock(&clp->cl_lock);
7645 lo = find_lockowner_str_locked(clp, owner);
7646 spin_unlock(&clp->cl_lock);
7647 return lo;
7648 }
7649
nfs4_unhash_lockowner(struct nfs4_stateowner * sop)7650 static void nfs4_unhash_lockowner(struct nfs4_stateowner *sop)
7651 {
7652 unhash_lockowner_locked(lockowner(sop));
7653 }
7654
nfs4_free_lockowner(struct nfs4_stateowner * sop)7655 static void nfs4_free_lockowner(struct nfs4_stateowner *sop)
7656 {
7657 struct nfs4_lockowner *lo = lockowner(sop);
7658
7659 kmem_cache_free(lockowner_slab, lo);
7660 }
7661
7662 static const struct nfs4_stateowner_operations lockowner_ops = {
7663 .so_unhash = nfs4_unhash_lockowner,
7664 .so_free = nfs4_free_lockowner,
7665 };
7666
7667 /*
7668 * Alloc a lock owner structure.
7669 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
7670 * occurred.
7671 *
7672 * strhashval = ownerstr_hashval
7673 */
7674 static struct nfs4_lockowner *
alloc_init_lock_stateowner(unsigned int strhashval,struct nfs4_client * clp,struct nfs4_ol_stateid * open_stp,struct nfsd4_lock * lock)7675 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp,
7676 struct nfs4_ol_stateid *open_stp,
7677 struct nfsd4_lock *lock)
7678 {
7679 struct nfs4_lockowner *lo, *ret;
7680
7681 lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
7682 if (!lo)
7683 return NULL;
7684 INIT_LIST_HEAD(&lo->lo_blocked);
7685 INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
7686 lo->lo_owner.so_is_open_owner = 0;
7687 lo->lo_owner.so_seqid = lock->lk_new_lock_seqid;
7688 lo->lo_owner.so_ops = &lockowner_ops;
7689 spin_lock(&clp->cl_lock);
7690 ret = find_lockowner_str_locked(clp, &lock->lk_new_owner);
7691 if (ret == NULL) {
7692 list_add(&lo->lo_owner.so_strhash,
7693 &clp->cl_ownerstr_hashtbl[strhashval]);
7694 ret = lo;
7695 } else
7696 nfs4_free_stateowner(&lo->lo_owner);
7697
7698 spin_unlock(&clp->cl_lock);
7699 return ret;
7700 }
7701
7702 static struct nfs4_ol_stateid *
find_lock_stateid(const struct nfs4_lockowner * lo,const struct nfs4_ol_stateid * ost)7703 find_lock_stateid(const struct nfs4_lockowner *lo,
7704 const struct nfs4_ol_stateid *ost)
7705 {
7706 struct nfs4_ol_stateid *lst;
7707
7708 lockdep_assert_held(&ost->st_stid.sc_client->cl_lock);
7709
7710 /* If ost is not hashed, ost->st_locks will not be valid */
7711 if (!nfs4_ol_stateid_unhashed(ost))
7712 list_for_each_entry(lst, &ost->st_locks, st_locks) {
7713 if (lst->st_stateowner == &lo->lo_owner) {
7714 refcount_inc(&lst->st_stid.sc_count);
7715 return lst;
7716 }
7717 }
7718 return NULL;
7719 }
7720
7721 static struct nfs4_ol_stateid *
init_lock_stateid(struct nfs4_ol_stateid * stp,struct nfs4_lockowner * lo,struct nfs4_file * fp,struct inode * inode,struct nfs4_ol_stateid * open_stp)7722 init_lock_stateid(struct nfs4_ol_stateid *stp, struct nfs4_lockowner *lo,
7723 struct nfs4_file *fp, struct inode *inode,
7724 struct nfs4_ol_stateid *open_stp)
7725 {
7726 struct nfs4_client *clp = lo->lo_owner.so_client;
7727 struct nfs4_ol_stateid *retstp;
7728
7729 mutex_init(&stp->st_mutex);
7730 mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX);
7731 retry:
7732 spin_lock(&clp->cl_lock);
7733 if (nfs4_ol_stateid_unhashed(open_stp))
7734 goto out_close;
7735 retstp = find_lock_stateid(lo, open_stp);
7736 if (retstp)
7737 goto out_found;
7738 refcount_inc(&stp->st_stid.sc_count);
7739 stp->st_stid.sc_type = SC_TYPE_LOCK;
7740 stp->st_stateowner = nfs4_get_stateowner(&lo->lo_owner);
7741 get_nfs4_file(fp);
7742 stp->st_stid.sc_file = fp;
7743 stp->st_access_bmap = 0;
7744 stp->st_deny_bmap = open_stp->st_deny_bmap;
7745 stp->st_openstp = open_stp;
7746 spin_lock(&fp->fi_lock);
7747 list_add(&stp->st_locks, &open_stp->st_locks);
7748 list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
7749 list_add(&stp->st_perfile, &fp->fi_stateids);
7750 spin_unlock(&fp->fi_lock);
7751 spin_unlock(&clp->cl_lock);
7752 return stp;
7753 out_found:
7754 spin_unlock(&clp->cl_lock);
7755 if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
7756 nfs4_put_stid(&retstp->st_stid);
7757 goto retry;
7758 }
7759 /* To keep mutex tracking happy */
7760 mutex_unlock(&stp->st_mutex);
7761 return retstp;
7762 out_close:
7763 spin_unlock(&clp->cl_lock);
7764 mutex_unlock(&stp->st_mutex);
7765 return NULL;
7766 }
7767
7768 static struct nfs4_ol_stateid *
find_or_create_lock_stateid(struct nfs4_lockowner * lo,struct nfs4_file * fi,struct inode * inode,struct nfs4_ol_stateid * ost,bool * new)7769 find_or_create_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fi,
7770 struct inode *inode, struct nfs4_ol_stateid *ost,
7771 bool *new)
7772 {
7773 struct nfs4_stid *ns = NULL;
7774 struct nfs4_ol_stateid *lst;
7775 struct nfs4_openowner *oo = openowner(ost->st_stateowner);
7776 struct nfs4_client *clp = oo->oo_owner.so_client;
7777
7778 *new = false;
7779 spin_lock(&clp->cl_lock);
7780 lst = find_lock_stateid(lo, ost);
7781 spin_unlock(&clp->cl_lock);
7782 if (lst != NULL) {
7783 if (nfsd4_lock_ol_stateid(lst) == nfs_ok)
7784 goto out;
7785 nfs4_put_stid(&lst->st_stid);
7786 }
7787 ns = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_lock_stateid);
7788 if (ns == NULL)
7789 return NULL;
7790
7791 lst = init_lock_stateid(openlockstateid(ns), lo, fi, inode, ost);
7792 if (lst == openlockstateid(ns))
7793 *new = true;
7794 else
7795 nfs4_put_stid(ns);
7796 out:
7797 return lst;
7798 }
7799
7800 static int
check_lock_length(u64 offset,u64 length)7801 check_lock_length(u64 offset, u64 length)
7802 {
7803 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
7804 (length > ~offset)));
7805 }
7806
get_lock_access(struct nfs4_ol_stateid * lock_stp,u32 access)7807 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
7808 {
7809 struct nfs4_file *fp = lock_stp->st_stid.sc_file;
7810
7811 lockdep_assert_held(&fp->fi_lock);
7812
7813 if (test_access(access, lock_stp))
7814 return;
7815 __nfs4_file_get_access(fp, access);
7816 set_access(access, lock_stp);
7817 }
7818
7819 static __be32
lookup_or_create_lock_state(struct nfsd4_compound_state * cstate,struct nfs4_ol_stateid * ost,struct nfsd4_lock * lock,struct nfs4_ol_stateid ** plst,bool * new)7820 lookup_or_create_lock_state(struct nfsd4_compound_state *cstate,
7821 struct nfs4_ol_stateid *ost,
7822 struct nfsd4_lock *lock,
7823 struct nfs4_ol_stateid **plst, bool *new)
7824 {
7825 __be32 status;
7826 struct nfs4_file *fi = ost->st_stid.sc_file;
7827 struct nfs4_openowner *oo = openowner(ost->st_stateowner);
7828 struct nfs4_client *cl = oo->oo_owner.so_client;
7829 struct inode *inode = d_inode(cstate->current_fh.fh_dentry);
7830 struct nfs4_lockowner *lo;
7831 struct nfs4_ol_stateid *lst;
7832 unsigned int strhashval;
7833
7834 lo = find_lockowner_str(cl, &lock->lk_new_owner);
7835 if (!lo) {
7836 strhashval = ownerstr_hashval(&lock->lk_new_owner);
7837 lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
7838 if (lo == NULL)
7839 return nfserr_jukebox;
7840 } else {
7841 /* with an existing lockowner, seqids must be the same */
7842 status = nfserr_bad_seqid;
7843 if (!cstate->minorversion &&
7844 lock->lk_new_lock_seqid != lo->lo_owner.so_seqid)
7845 goto out;
7846 }
7847
7848 lst = find_or_create_lock_stateid(lo, fi, inode, ost, new);
7849 if (lst == NULL) {
7850 status = nfserr_jukebox;
7851 goto out;
7852 }
7853
7854 status = nfs_ok;
7855 *plst = lst;
7856 out:
7857 nfs4_put_stateowner(&lo->lo_owner);
7858 return status;
7859 }
7860
7861 /*
7862 * LOCK operation
7863 */
7864 __be32
nfsd4_lock(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7865 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7866 union nfsd4_op_u *u)
7867 {
7868 struct nfsd4_lock *lock = &u->lock;
7869 struct nfs4_openowner *open_sop = NULL;
7870 struct nfs4_lockowner *lock_sop = NULL;
7871 struct nfs4_ol_stateid *lock_stp = NULL;
7872 struct nfs4_ol_stateid *open_stp = NULL;
7873 struct nfs4_file *fp;
7874 struct nfsd_file *nf = NULL;
7875 struct nfsd4_blocked_lock *nbl = NULL;
7876 struct file_lock *file_lock = NULL;
7877 struct file_lock *conflock = NULL;
7878 struct super_block *sb;
7879 __be32 status = 0;
7880 int lkflg;
7881 int err;
7882 bool new = false;
7883 unsigned char type;
7884 unsigned int flags = FL_POSIX;
7885 struct net *net = SVC_NET(rqstp);
7886 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7887
7888 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
7889 (long long) lock->lk_offset,
7890 (long long) lock->lk_length);
7891
7892 if (check_lock_length(lock->lk_offset, lock->lk_length))
7893 return nfserr_inval;
7894
7895 if ((status = fh_verify(rqstp, &cstate->current_fh,
7896 S_IFREG, NFSD_MAY_LOCK))) {
7897 dprintk("NFSD: nfsd4_lock: permission denied!\n");
7898 return status;
7899 }
7900 sb = cstate->current_fh.fh_dentry->d_sb;
7901
7902 if (lock->lk_is_new) {
7903 if (nfsd4_has_session(cstate))
7904 /* See rfc 5661 18.10.3: given clientid is ignored: */
7905 memcpy(&lock->lk_new_clientid,
7906 &cstate->clp->cl_clientid,
7907 sizeof(clientid_t));
7908
7909 /* validate and update open stateid and open seqid */
7910 status = nfs4_preprocess_confirmed_seqid_op(cstate,
7911 lock->lk_new_open_seqid,
7912 &lock->lk_new_open_stateid,
7913 &open_stp, nn);
7914 if (status)
7915 goto out;
7916 mutex_unlock(&open_stp->st_mutex);
7917 open_sop = openowner(open_stp->st_stateowner);
7918 status = nfserr_bad_stateid;
7919 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
7920 &lock->lk_new_clientid))
7921 goto out;
7922 status = lookup_or_create_lock_state(cstate, open_stp, lock,
7923 &lock_stp, &new);
7924 } else {
7925 status = nfs4_preprocess_seqid_op(cstate,
7926 lock->lk_old_lock_seqid,
7927 &lock->lk_old_lock_stateid,
7928 SC_TYPE_LOCK, 0, &lock_stp,
7929 nn);
7930 }
7931 if (status)
7932 goto out;
7933 lock_sop = lockowner(lock_stp->st_stateowner);
7934
7935 lkflg = setlkflg(lock->lk_type);
7936 status = nfs4_check_openmode(lock_stp, lkflg);
7937 if (status)
7938 goto out;
7939
7940 status = nfserr_grace;
7941 if (locks_in_grace(net) && !lock->lk_reclaim)
7942 goto out;
7943 status = nfserr_no_grace;
7944 if (!locks_in_grace(net) && lock->lk_reclaim)
7945 goto out;
7946
7947 if (lock->lk_reclaim)
7948 flags |= FL_RECLAIM;
7949
7950 fp = lock_stp->st_stid.sc_file;
7951 switch (lock->lk_type) {
7952 case NFS4_READW_LT:
7953 if (nfsd4_has_session(cstate) ||
7954 exportfs_lock_op_is_async(sb->s_export_op))
7955 flags |= FL_SLEEP;
7956 fallthrough;
7957 case NFS4_READ_LT:
7958 spin_lock(&fp->fi_lock);
7959 nf = find_readable_file_locked(fp);
7960 if (nf)
7961 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
7962 spin_unlock(&fp->fi_lock);
7963 type = F_RDLCK;
7964 break;
7965 case NFS4_WRITEW_LT:
7966 if (nfsd4_has_session(cstate) ||
7967 exportfs_lock_op_is_async(sb->s_export_op))
7968 flags |= FL_SLEEP;
7969 fallthrough;
7970 case NFS4_WRITE_LT:
7971 spin_lock(&fp->fi_lock);
7972 nf = find_writeable_file_locked(fp);
7973 if (nf)
7974 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
7975 spin_unlock(&fp->fi_lock);
7976 type = F_WRLCK;
7977 break;
7978 default:
7979 status = nfserr_inval;
7980 goto out;
7981 }
7982
7983 if (!nf) {
7984 status = nfserr_openmode;
7985 goto out;
7986 }
7987
7988 /*
7989 * Most filesystems with their own ->lock operations will block
7990 * the nfsd thread waiting to acquire the lock. That leads to
7991 * deadlocks (we don't want every nfsd thread tied up waiting
7992 * for file locks), so don't attempt blocking lock notifications
7993 * on those filesystems:
7994 */
7995 if (!exportfs_lock_op_is_async(sb->s_export_op))
7996 flags &= ~FL_SLEEP;
7997
7998 nbl = find_or_allocate_block(lock_sop, &fp->fi_fhandle, nn);
7999 if (!nbl) {
8000 dprintk("NFSD: %s: unable to allocate block!\n", __func__);
8001 status = nfserr_jukebox;
8002 goto out;
8003 }
8004
8005 file_lock = &nbl->nbl_lock;
8006 file_lock->c.flc_type = type;
8007 file_lock->c.flc_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(&lock_sop->lo_owner));
8008 file_lock->c.flc_pid = current->tgid;
8009 file_lock->c.flc_file = nf->nf_file;
8010 file_lock->c.flc_flags = flags;
8011 file_lock->fl_lmops = &nfsd_posix_mng_ops;
8012 file_lock->fl_start = lock->lk_offset;
8013 file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
8014 nfs4_transform_lock_offset(file_lock);
8015
8016 conflock = locks_alloc_lock();
8017 if (!conflock) {
8018 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
8019 status = nfserr_jukebox;
8020 goto out;
8021 }
8022
8023 if (flags & FL_SLEEP) {
8024 nbl->nbl_time = ktime_get_boottime_seconds();
8025 spin_lock(&nn->blocked_locks_lock);
8026 list_add_tail(&nbl->nbl_list, &lock_sop->lo_blocked);
8027 list_add_tail(&nbl->nbl_lru, &nn->blocked_locks_lru);
8028 kref_get(&nbl->nbl_kref);
8029 spin_unlock(&nn->blocked_locks_lock);
8030 }
8031
8032 err = vfs_lock_file(nf->nf_file, F_SETLK, file_lock, conflock);
8033 switch (err) {
8034 case 0: /* success! */
8035 nfs4_inc_and_copy_stateid(&lock->lk_resp_stateid, &lock_stp->st_stid);
8036 status = 0;
8037 if (lock->lk_reclaim)
8038 nn->somebody_reclaimed = true;
8039 break;
8040 case FILE_LOCK_DEFERRED:
8041 kref_put(&nbl->nbl_kref, free_nbl);
8042 nbl = NULL;
8043 fallthrough;
8044 case -EAGAIN: /* conflock holds conflicting lock */
8045 status = nfserr_denied;
8046 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
8047 nfs4_set_lock_denied(conflock, &lock->lk_denied);
8048 break;
8049 case -EDEADLK:
8050 status = nfserr_deadlock;
8051 break;
8052 default:
8053 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
8054 status = nfserrno(err);
8055 break;
8056 }
8057 out:
8058 if (nbl) {
8059 /* dequeue it if we queued it before */
8060 if (flags & FL_SLEEP) {
8061 spin_lock(&nn->blocked_locks_lock);
8062 if (!list_empty(&nbl->nbl_list) &&
8063 !list_empty(&nbl->nbl_lru)) {
8064 list_del_init(&nbl->nbl_list);
8065 list_del_init(&nbl->nbl_lru);
8066 kref_put(&nbl->nbl_kref, free_nbl);
8067 }
8068 /* nbl can use one of lists to be linked to reaplist */
8069 spin_unlock(&nn->blocked_locks_lock);
8070 }
8071 free_blocked_lock(nbl);
8072 }
8073 if (nf)
8074 nfsd_file_put(nf);
8075 if (lock_stp) {
8076 /* Bump seqid manually if the 4.0 replay owner is openowner */
8077 if (cstate->replay_owner &&
8078 cstate->replay_owner != &lock_sop->lo_owner &&
8079 seqid_mutating_err(ntohl(status)))
8080 lock_sop->lo_owner.so_seqid++;
8081
8082 /*
8083 * If this is a new, never-before-used stateid, and we are
8084 * returning an error, then just go ahead and release it.
8085 */
8086 if (status && new)
8087 release_lock_stateid(lock_stp);
8088
8089 mutex_unlock(&lock_stp->st_mutex);
8090
8091 nfs4_put_stid(&lock_stp->st_stid);
8092 }
8093 if (open_stp)
8094 nfs4_put_stid(&open_stp->st_stid);
8095 nfsd4_bump_seqid(cstate, status);
8096 if (conflock)
8097 locks_free_lock(conflock);
8098 return status;
8099 }
8100
nfsd4_lock_release(union nfsd4_op_u * u)8101 void nfsd4_lock_release(union nfsd4_op_u *u)
8102 {
8103 struct nfsd4_lock *lock = &u->lock;
8104 struct nfsd4_lock_denied *deny = &lock->lk_denied;
8105
8106 kfree(deny->ld_owner.data);
8107 }
8108
8109 /*
8110 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
8111 * so we do a temporary open here just to get an open file to pass to
8112 * vfs_test_lock.
8113 */
nfsd_test_lock(struct svc_rqst * rqstp,struct svc_fh * fhp,struct file_lock * lock)8114 static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
8115 {
8116 struct nfsd_file *nf;
8117 struct inode *inode;
8118 __be32 err;
8119
8120 err = nfsd_file_acquire(rqstp, fhp, NFSD_MAY_READ, &nf);
8121 if (err)
8122 return err;
8123 inode = fhp->fh_dentry->d_inode;
8124 inode_lock(inode); /* to block new leases till after test_lock: */
8125 err = nfserrno(nfsd_open_break_lease(inode, NFSD_MAY_READ));
8126 if (err)
8127 goto out;
8128 lock->c.flc_file = nf->nf_file;
8129 err = nfserrno(vfs_test_lock(nf->nf_file, lock));
8130 lock->c.flc_file = NULL;
8131 out:
8132 inode_unlock(inode);
8133 nfsd_file_put(nf);
8134 return err;
8135 }
8136
8137 /*
8138 * LOCKT operation
8139 */
8140 __be32
nfsd4_lockt(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8141 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
8142 union nfsd4_op_u *u)
8143 {
8144 struct nfsd4_lockt *lockt = &u->lockt;
8145 struct file_lock *file_lock = NULL;
8146 struct nfs4_lockowner *lo = NULL;
8147 __be32 status;
8148 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
8149
8150 if (locks_in_grace(SVC_NET(rqstp)))
8151 return nfserr_grace;
8152
8153 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
8154 return nfserr_inval;
8155
8156 if (!nfsd4_has_session(cstate)) {
8157 status = set_client(&lockt->lt_clientid, cstate, nn);
8158 if (status)
8159 goto out;
8160 }
8161
8162 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
8163 goto out;
8164
8165 file_lock = locks_alloc_lock();
8166 if (!file_lock) {
8167 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
8168 status = nfserr_jukebox;
8169 goto out;
8170 }
8171
8172 switch (lockt->lt_type) {
8173 case NFS4_READ_LT:
8174 case NFS4_READW_LT:
8175 file_lock->c.flc_type = F_RDLCK;
8176 break;
8177 case NFS4_WRITE_LT:
8178 case NFS4_WRITEW_LT:
8179 file_lock->c.flc_type = F_WRLCK;
8180 break;
8181 default:
8182 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
8183 status = nfserr_inval;
8184 goto out;
8185 }
8186
8187 lo = find_lockowner_str(cstate->clp, &lockt->lt_owner);
8188 if (lo)
8189 file_lock->c.flc_owner = (fl_owner_t)lo;
8190 file_lock->c.flc_pid = current->tgid;
8191 file_lock->c.flc_flags = FL_POSIX;
8192
8193 file_lock->fl_start = lockt->lt_offset;
8194 file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
8195
8196 nfs4_transform_lock_offset(file_lock);
8197
8198 status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
8199 if (status)
8200 goto out;
8201
8202 if (file_lock->c.flc_type != F_UNLCK) {
8203 status = nfserr_denied;
8204 nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
8205 }
8206 out:
8207 if (lo)
8208 nfs4_put_stateowner(&lo->lo_owner);
8209 if (file_lock)
8210 locks_free_lock(file_lock);
8211 return status;
8212 }
8213
nfsd4_lockt_release(union nfsd4_op_u * u)8214 void nfsd4_lockt_release(union nfsd4_op_u *u)
8215 {
8216 struct nfsd4_lockt *lockt = &u->lockt;
8217 struct nfsd4_lock_denied *deny = &lockt->lt_denied;
8218
8219 kfree(deny->ld_owner.data);
8220 }
8221
8222 __be32
nfsd4_locku(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8223 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
8224 union nfsd4_op_u *u)
8225 {
8226 struct nfsd4_locku *locku = &u->locku;
8227 struct nfs4_ol_stateid *stp;
8228 struct nfsd_file *nf = NULL;
8229 struct file_lock *file_lock = NULL;
8230 __be32 status;
8231 int err;
8232 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
8233
8234 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
8235 (long long) locku->lu_offset,
8236 (long long) locku->lu_length);
8237
8238 if (check_lock_length(locku->lu_offset, locku->lu_length))
8239 return nfserr_inval;
8240
8241 status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
8242 &locku->lu_stateid, SC_TYPE_LOCK, 0,
8243 &stp, nn);
8244 if (status)
8245 goto out;
8246 nf = find_any_file(stp->st_stid.sc_file);
8247 if (!nf) {
8248 status = nfserr_lock_range;
8249 goto put_stateid;
8250 }
8251 file_lock = locks_alloc_lock();
8252 if (!file_lock) {
8253 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
8254 status = nfserr_jukebox;
8255 goto put_file;
8256 }
8257
8258 file_lock->c.flc_type = F_UNLCK;
8259 file_lock->c.flc_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(stp->st_stateowner));
8260 file_lock->c.flc_pid = current->tgid;
8261 file_lock->c.flc_file = nf->nf_file;
8262 file_lock->c.flc_flags = FL_POSIX;
8263 file_lock->fl_lmops = &nfsd_posix_mng_ops;
8264 file_lock->fl_start = locku->lu_offset;
8265
8266 file_lock->fl_end = last_byte_offset(locku->lu_offset,
8267 locku->lu_length);
8268 nfs4_transform_lock_offset(file_lock);
8269
8270 err = vfs_lock_file(nf->nf_file, F_SETLK, file_lock, NULL);
8271 if (err) {
8272 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
8273 goto out_nfserr;
8274 }
8275 nfs4_inc_and_copy_stateid(&locku->lu_stateid, &stp->st_stid);
8276 put_file:
8277 nfsd_file_put(nf);
8278 put_stateid:
8279 mutex_unlock(&stp->st_mutex);
8280 nfs4_put_stid(&stp->st_stid);
8281 out:
8282 nfsd4_bump_seqid(cstate, status);
8283 if (file_lock)
8284 locks_free_lock(file_lock);
8285 return status;
8286
8287 out_nfserr:
8288 status = nfserrno(err);
8289 goto put_file;
8290 }
8291
8292 /*
8293 * returns
8294 * true: locks held by lockowner
8295 * false: no locks held by lockowner
8296 */
8297 static bool
check_for_locks(struct nfs4_file * fp,struct nfs4_lockowner * lowner)8298 check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner)
8299 {
8300 struct file_lock *fl;
8301 int status = false;
8302 struct nfsd_file *nf;
8303 struct inode *inode;
8304 struct file_lock_context *flctx;
8305
8306 spin_lock(&fp->fi_lock);
8307 nf = find_any_file_locked(fp);
8308 if (!nf) {
8309 /* Any valid lock stateid should have some sort of access */
8310 WARN_ON_ONCE(1);
8311 goto out;
8312 }
8313
8314 inode = file_inode(nf->nf_file);
8315 flctx = locks_inode_context(inode);
8316
8317 if (flctx && !list_empty_careful(&flctx->flc_posix)) {
8318 spin_lock(&flctx->flc_lock);
8319 for_each_file_lock(fl, &flctx->flc_posix) {
8320 if (fl->c.flc_owner == (fl_owner_t)lowner) {
8321 status = true;
8322 break;
8323 }
8324 }
8325 spin_unlock(&flctx->flc_lock);
8326 }
8327 out:
8328 spin_unlock(&fp->fi_lock);
8329 return status;
8330 }
8331
8332 /**
8333 * nfsd4_release_lockowner - process NFSv4.0 RELEASE_LOCKOWNER operations
8334 * @rqstp: RPC transaction
8335 * @cstate: NFSv4 COMPOUND state
8336 * @u: RELEASE_LOCKOWNER arguments
8337 *
8338 * Check if theree are any locks still held and if not - free the lockowner
8339 * and any lock state that is owned.
8340 *
8341 * Return values:
8342 * %nfs_ok: lockowner released or not found
8343 * %nfserr_locks_held: lockowner still in use
8344 * %nfserr_stale_clientid: clientid no longer active
8345 * %nfserr_expired: clientid not recognized
8346 */
8347 __be32
nfsd4_release_lockowner(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8348 nfsd4_release_lockowner(struct svc_rqst *rqstp,
8349 struct nfsd4_compound_state *cstate,
8350 union nfsd4_op_u *u)
8351 {
8352 struct nfsd4_release_lockowner *rlockowner = &u->release_lockowner;
8353 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
8354 clientid_t *clid = &rlockowner->rl_clientid;
8355 struct nfs4_ol_stateid *stp;
8356 struct nfs4_lockowner *lo;
8357 struct nfs4_client *clp;
8358 LIST_HEAD(reaplist);
8359 __be32 status;
8360
8361 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
8362 clid->cl_boot, clid->cl_id);
8363
8364 status = set_client(clid, cstate, nn);
8365 if (status)
8366 return status;
8367 clp = cstate->clp;
8368
8369 spin_lock(&clp->cl_lock);
8370 lo = find_lockowner_str_locked(clp, &rlockowner->rl_owner);
8371 if (!lo) {
8372 spin_unlock(&clp->cl_lock);
8373 return nfs_ok;
8374 }
8375
8376 list_for_each_entry(stp, &lo->lo_owner.so_stateids, st_perstateowner) {
8377 if (check_for_locks(stp->st_stid.sc_file, lo)) {
8378 spin_unlock(&clp->cl_lock);
8379 nfs4_put_stateowner(&lo->lo_owner);
8380 return nfserr_locks_held;
8381 }
8382 }
8383 unhash_lockowner_locked(lo);
8384 while (!list_empty(&lo->lo_owner.so_stateids)) {
8385 stp = list_first_entry(&lo->lo_owner.so_stateids,
8386 struct nfs4_ol_stateid,
8387 st_perstateowner);
8388 unhash_lock_stateid(stp);
8389 put_ol_stateid_locked(stp, &reaplist);
8390 }
8391 spin_unlock(&clp->cl_lock);
8392
8393 free_ol_stateid_reaplist(&reaplist);
8394 remove_blocked_locks(lo);
8395 nfs4_put_stateowner(&lo->lo_owner);
8396 return nfs_ok;
8397 }
8398
8399 static inline struct nfs4_client_reclaim *
alloc_reclaim(void)8400 alloc_reclaim(void)
8401 {
8402 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
8403 }
8404
8405 bool
nfs4_has_reclaimed_state(struct xdr_netobj name,struct nfsd_net * nn)8406 nfs4_has_reclaimed_state(struct xdr_netobj name, struct nfsd_net *nn)
8407 {
8408 struct nfs4_client_reclaim *crp;
8409
8410 crp = nfsd4_find_reclaim_client(name, nn);
8411 return (crp && crp->cr_clp);
8412 }
8413
8414 /*
8415 * failure => all reset bets are off, nfserr_no_grace...
8416 *
8417 * The caller is responsible for freeing name.data if NULL is returned (it
8418 * will be freed in nfs4_remove_reclaim_record in the normal case).
8419 */
8420 struct nfs4_client_reclaim *
nfs4_client_to_reclaim(struct xdr_netobj name,struct xdr_netobj princhash,struct nfsd_net * nn)8421 nfs4_client_to_reclaim(struct xdr_netobj name, struct xdr_netobj princhash,
8422 struct nfsd_net *nn)
8423 {
8424 unsigned int strhashval;
8425 struct nfs4_client_reclaim *crp;
8426
8427 crp = alloc_reclaim();
8428 if (crp) {
8429 strhashval = clientstr_hashval(name);
8430 INIT_LIST_HEAD(&crp->cr_strhash);
8431 list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
8432 crp->cr_name.data = name.data;
8433 crp->cr_name.len = name.len;
8434 crp->cr_princhash.data = princhash.data;
8435 crp->cr_princhash.len = princhash.len;
8436 crp->cr_clp = NULL;
8437 nn->reclaim_str_hashtbl_size++;
8438 }
8439 return crp;
8440 }
8441
8442 void
nfs4_remove_reclaim_record(struct nfs4_client_reclaim * crp,struct nfsd_net * nn)8443 nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
8444 {
8445 list_del(&crp->cr_strhash);
8446 kfree(crp->cr_name.data);
8447 kfree(crp->cr_princhash.data);
8448 kfree(crp);
8449 nn->reclaim_str_hashtbl_size--;
8450 }
8451
8452 void
nfs4_release_reclaim(struct nfsd_net * nn)8453 nfs4_release_reclaim(struct nfsd_net *nn)
8454 {
8455 struct nfs4_client_reclaim *crp = NULL;
8456 int i;
8457
8458 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
8459 while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
8460 crp = list_entry(nn->reclaim_str_hashtbl[i].next,
8461 struct nfs4_client_reclaim, cr_strhash);
8462 nfs4_remove_reclaim_record(crp, nn);
8463 }
8464 }
8465 WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
8466 }
8467
8468 /*
8469 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
8470 struct nfs4_client_reclaim *
nfsd4_find_reclaim_client(struct xdr_netobj name,struct nfsd_net * nn)8471 nfsd4_find_reclaim_client(struct xdr_netobj name, struct nfsd_net *nn)
8472 {
8473 unsigned int strhashval;
8474 struct nfs4_client_reclaim *crp = NULL;
8475
8476 strhashval = clientstr_hashval(name);
8477 list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
8478 if (compare_blob(&crp->cr_name, &name) == 0) {
8479 return crp;
8480 }
8481 }
8482 return NULL;
8483 }
8484
8485 __be32
nfs4_check_open_reclaim(struct nfs4_client * clp)8486 nfs4_check_open_reclaim(struct nfs4_client *clp)
8487 {
8488 if (test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &clp->cl_flags))
8489 return nfserr_no_grace;
8490
8491 if (nfsd4_client_record_check(clp))
8492 return nfserr_reclaim_bad;
8493
8494 return nfs_ok;
8495 }
8496
8497 /*
8498 * Since the lifetime of a delegation isn't limited to that of an open, a
8499 * client may quite reasonably hang on to a delegation as long as it has
8500 * the inode cached. This becomes an obvious problem the first time a
8501 * client's inode cache approaches the size of the server's total memory.
8502 *
8503 * For now we avoid this problem by imposing a hard limit on the number
8504 * of delegations, which varies according to the server's memory size.
8505 */
8506 static void
set_max_delegations(void)8507 set_max_delegations(void)
8508 {
8509 /*
8510 * Allow at most 4 delegations per megabyte of RAM. Quick
8511 * estimates suggest that in the worst case (where every delegation
8512 * is for a different inode), a delegation could take about 1.5K,
8513 * giving a worst case usage of about 6% of memory.
8514 */
8515 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
8516 }
8517
nfs4_state_create_net(struct net * net)8518 static int nfs4_state_create_net(struct net *net)
8519 {
8520 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
8521 int i;
8522
8523 nn->conf_id_hashtbl = kmalloc_array(CLIENT_HASH_SIZE,
8524 sizeof(struct list_head),
8525 GFP_KERNEL);
8526 if (!nn->conf_id_hashtbl)
8527 goto err;
8528 nn->unconf_id_hashtbl = kmalloc_array(CLIENT_HASH_SIZE,
8529 sizeof(struct list_head),
8530 GFP_KERNEL);
8531 if (!nn->unconf_id_hashtbl)
8532 goto err_unconf_id;
8533 nn->sessionid_hashtbl = kmalloc_array(SESSION_HASH_SIZE,
8534 sizeof(struct list_head),
8535 GFP_KERNEL);
8536 if (!nn->sessionid_hashtbl)
8537 goto err_sessionid;
8538
8539 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
8540 INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
8541 INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
8542 }
8543 for (i = 0; i < SESSION_HASH_SIZE; i++)
8544 INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]);
8545 nn->conf_name_tree = RB_ROOT;
8546 nn->unconf_name_tree = RB_ROOT;
8547 nn->boot_time = ktime_get_real_seconds();
8548 nn->grace_ended = false;
8549 nn->nfsd4_manager.block_opens = true;
8550 INIT_LIST_HEAD(&nn->nfsd4_manager.list);
8551 INIT_LIST_HEAD(&nn->client_lru);
8552 INIT_LIST_HEAD(&nn->close_lru);
8553 INIT_LIST_HEAD(&nn->del_recall_lru);
8554 spin_lock_init(&nn->client_lock);
8555 spin_lock_init(&nn->s2s_cp_lock);
8556 idr_init(&nn->s2s_cp_stateids);
8557
8558 spin_lock_init(&nn->blocked_locks_lock);
8559 INIT_LIST_HEAD(&nn->blocked_locks_lru);
8560
8561 INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
8562 INIT_WORK(&nn->nfsd_shrinker_work, nfsd4_state_shrinker_worker);
8563 get_net(net);
8564
8565 nn->nfsd_client_shrinker = shrinker_alloc(0, "nfsd-client");
8566 if (!nn->nfsd_client_shrinker)
8567 goto err_shrinker;
8568
8569 nn->nfsd_client_shrinker->scan_objects = nfsd4_state_shrinker_scan;
8570 nn->nfsd_client_shrinker->count_objects = nfsd4_state_shrinker_count;
8571 nn->nfsd_client_shrinker->private_data = nn;
8572
8573 shrinker_register(nn->nfsd_client_shrinker);
8574
8575 return 0;
8576
8577 err_shrinker:
8578 put_net(net);
8579 kfree(nn->sessionid_hashtbl);
8580 err_sessionid:
8581 kfree(nn->unconf_id_hashtbl);
8582 err_unconf_id:
8583 kfree(nn->conf_id_hashtbl);
8584 err:
8585 return -ENOMEM;
8586 }
8587
8588 static void
nfs4_state_destroy_net(struct net * net)8589 nfs4_state_destroy_net(struct net *net)
8590 {
8591 int i;
8592 struct nfs4_client *clp = NULL;
8593 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
8594
8595 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
8596 while (!list_empty(&nn->conf_id_hashtbl[i])) {
8597 clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
8598 destroy_client(clp);
8599 }
8600 }
8601
8602 WARN_ON(!list_empty(&nn->blocked_locks_lru));
8603
8604 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
8605 while (!list_empty(&nn->unconf_id_hashtbl[i])) {
8606 clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
8607 destroy_client(clp);
8608 }
8609 }
8610
8611 kfree(nn->sessionid_hashtbl);
8612 kfree(nn->unconf_id_hashtbl);
8613 kfree(nn->conf_id_hashtbl);
8614 put_net(net);
8615 }
8616
8617 int
nfs4_state_start_net(struct net * net)8618 nfs4_state_start_net(struct net *net)
8619 {
8620 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
8621 int ret;
8622
8623 ret = nfs4_state_create_net(net);
8624 if (ret)
8625 return ret;
8626 locks_start_grace(net, &nn->nfsd4_manager);
8627 nfsd4_client_tracking_init(net);
8628 if (nn->track_reclaim_completes && nn->reclaim_str_hashtbl_size == 0)
8629 goto skip_grace;
8630 printk(KERN_INFO "NFSD: starting %lld-second grace period (net %x)\n",
8631 nn->nfsd4_grace, net->ns.inum);
8632 trace_nfsd_grace_start(nn);
8633 queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ);
8634 return 0;
8635
8636 skip_grace:
8637 printk(KERN_INFO "NFSD: no clients to reclaim, skipping NFSv4 grace period (net %x)\n",
8638 net->ns.inum);
8639 queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_lease * HZ);
8640 nfsd4_end_grace(nn);
8641 return 0;
8642 }
8643
8644 /* initialization to perform when the nfsd service is started: */
8645
8646 int
nfs4_state_start(void)8647 nfs4_state_start(void)
8648 {
8649 int ret;
8650
8651 ret = rhltable_init(&nfs4_file_rhltable, &nfs4_file_rhash_params);
8652 if (ret)
8653 return ret;
8654
8655 set_max_delegations();
8656 return 0;
8657 }
8658
8659 void
nfs4_state_shutdown_net(struct net * net)8660 nfs4_state_shutdown_net(struct net *net)
8661 {
8662 struct nfs4_delegation *dp = NULL;
8663 struct list_head *pos, *next, reaplist;
8664 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
8665
8666 shrinker_free(nn->nfsd_client_shrinker);
8667 cancel_work(&nn->nfsd_shrinker_work);
8668 cancel_delayed_work_sync(&nn->laundromat_work);
8669 locks_end_grace(&nn->nfsd4_manager);
8670
8671 INIT_LIST_HEAD(&reaplist);
8672 spin_lock(&state_lock);
8673 list_for_each_safe(pos, next, &nn->del_recall_lru) {
8674 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
8675 unhash_delegation_locked(dp, SC_STATUS_CLOSED);
8676 list_add(&dp->dl_recall_lru, &reaplist);
8677 }
8678 spin_unlock(&state_lock);
8679 list_for_each_safe(pos, next, &reaplist) {
8680 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
8681 list_del_init(&dp->dl_recall_lru);
8682 destroy_unhashed_deleg(dp);
8683 }
8684
8685 nfsd4_client_tracking_exit(net);
8686 nfs4_state_destroy_net(net);
8687 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
8688 nfsd4_ssc_shutdown_umount(nn);
8689 #endif
8690 }
8691
8692 void
nfs4_state_shutdown(void)8693 nfs4_state_shutdown(void)
8694 {
8695 rhltable_destroy(&nfs4_file_rhltable);
8696 }
8697
8698 static void
get_stateid(struct nfsd4_compound_state * cstate,stateid_t * stateid)8699 get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
8700 {
8701 if (HAS_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG) &&
8702 CURRENT_STATEID(stateid))
8703 memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
8704 }
8705
8706 static void
put_stateid(struct nfsd4_compound_state * cstate,stateid_t * stateid)8707 put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
8708 {
8709 if (cstate->minorversion) {
8710 memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
8711 SET_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG);
8712 }
8713 }
8714
8715 void
clear_current_stateid(struct nfsd4_compound_state * cstate)8716 clear_current_stateid(struct nfsd4_compound_state *cstate)
8717 {
8718 CLEAR_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG);
8719 }
8720
8721 /*
8722 * functions to set current state id
8723 */
8724 void
nfsd4_set_opendowngradestateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8725 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate,
8726 union nfsd4_op_u *u)
8727 {
8728 put_stateid(cstate, &u->open_downgrade.od_stateid);
8729 }
8730
8731 void
nfsd4_set_openstateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8732 nfsd4_set_openstateid(struct nfsd4_compound_state *cstate,
8733 union nfsd4_op_u *u)
8734 {
8735 put_stateid(cstate, &u->open.op_stateid);
8736 }
8737
8738 void
nfsd4_set_closestateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8739 nfsd4_set_closestateid(struct nfsd4_compound_state *cstate,
8740 union nfsd4_op_u *u)
8741 {
8742 put_stateid(cstate, &u->close.cl_stateid);
8743 }
8744
8745 void
nfsd4_set_lockstateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8746 nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate,
8747 union nfsd4_op_u *u)
8748 {
8749 put_stateid(cstate, &u->lock.lk_resp_stateid);
8750 }
8751
8752 /*
8753 * functions to consume current state id
8754 */
8755
8756 void
nfsd4_get_opendowngradestateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8757 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate,
8758 union nfsd4_op_u *u)
8759 {
8760 get_stateid(cstate, &u->open_downgrade.od_stateid);
8761 }
8762
8763 void
nfsd4_get_delegreturnstateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8764 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate,
8765 union nfsd4_op_u *u)
8766 {
8767 get_stateid(cstate, &u->delegreturn.dr_stateid);
8768 }
8769
8770 void
nfsd4_get_freestateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8771 nfsd4_get_freestateid(struct nfsd4_compound_state *cstate,
8772 union nfsd4_op_u *u)
8773 {
8774 get_stateid(cstate, &u->free_stateid.fr_stateid);
8775 }
8776
8777 void
nfsd4_get_setattrstateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8778 nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate,
8779 union nfsd4_op_u *u)
8780 {
8781 get_stateid(cstate, &u->setattr.sa_stateid);
8782 }
8783
8784 void
nfsd4_get_closestateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8785 nfsd4_get_closestateid(struct nfsd4_compound_state *cstate,
8786 union nfsd4_op_u *u)
8787 {
8788 get_stateid(cstate, &u->close.cl_stateid);
8789 }
8790
8791 void
nfsd4_get_lockustateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8792 nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate,
8793 union nfsd4_op_u *u)
8794 {
8795 get_stateid(cstate, &u->locku.lu_stateid);
8796 }
8797
8798 void
nfsd4_get_readstateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8799 nfsd4_get_readstateid(struct nfsd4_compound_state *cstate,
8800 union nfsd4_op_u *u)
8801 {
8802 get_stateid(cstate, &u->read.rd_stateid);
8803 }
8804
8805 void
nfsd4_get_writestateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8806 nfsd4_get_writestateid(struct nfsd4_compound_state *cstate,
8807 union nfsd4_op_u *u)
8808 {
8809 get_stateid(cstate, &u->write.wr_stateid);
8810 }
8811
8812 /**
8813 * nfsd4_deleg_getattr_conflict - Recall if GETATTR causes conflict
8814 * @rqstp: RPC transaction context
8815 * @inode: file to be checked for a conflict
8816 * @modified: return true if file was modified
8817 * @size: new size of file if modified is true
8818 *
8819 * This function is called when there is a conflict between a write
8820 * delegation and a change/size GETATTR from another client. The server
8821 * must either use the CB_GETATTR to get the current values of the
8822 * attributes from the client that holds the delegation or recall the
8823 * delegation before replying to the GETATTR. See RFC 8881 section
8824 * 18.7.4.
8825 *
8826 * Returns 0 if there is no conflict; otherwise an nfs_stat
8827 * code is returned.
8828 */
8829 __be32
nfsd4_deleg_getattr_conflict(struct svc_rqst * rqstp,struct inode * inode,bool * modified,u64 * size)8830 nfsd4_deleg_getattr_conflict(struct svc_rqst *rqstp, struct inode *inode,
8831 bool *modified, u64 *size)
8832 {
8833 __be32 status;
8834 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
8835 struct file_lock_context *ctx;
8836 struct file_lease *fl;
8837 struct nfs4_delegation *dp;
8838 struct iattr attrs;
8839 struct nfs4_cb_fattr *ncf;
8840
8841 *modified = false;
8842 ctx = locks_inode_context(inode);
8843 if (!ctx)
8844 return 0;
8845 spin_lock(&ctx->flc_lock);
8846 for_each_file_lock(fl, &ctx->flc_lease) {
8847 unsigned char type = fl->c.flc_type;
8848
8849 if (fl->c.flc_flags == FL_LAYOUT)
8850 continue;
8851 if (fl->fl_lmops != &nfsd_lease_mng_ops) {
8852 /*
8853 * non-nfs lease, if it's a lease with F_RDLCK then
8854 * we are done; there isn't any write delegation
8855 * on this inode
8856 */
8857 if (type == F_RDLCK)
8858 break;
8859 goto break_lease;
8860 }
8861 if (type == F_WRLCK) {
8862 dp = fl->c.flc_owner;
8863 if (dp->dl_recall.cb_clp == *(rqstp->rq_lease_breaker)) {
8864 spin_unlock(&ctx->flc_lock);
8865 return 0;
8866 }
8867 break_lease:
8868 nfsd_stats_wdeleg_getattr_inc(nn);
8869 dp = fl->c.flc_owner;
8870 ncf = &dp->dl_cb_fattr;
8871 nfs4_cb_getattr(&dp->dl_cb_fattr);
8872 spin_unlock(&ctx->flc_lock);
8873 wait_on_bit_timeout(&ncf->ncf_cb_flags, CB_GETATTR_BUSY,
8874 TASK_INTERRUPTIBLE, NFSD_CB_GETATTR_TIMEOUT);
8875 if (ncf->ncf_cb_status) {
8876 /* Recall delegation only if client didn't respond */
8877 status = nfserrno(nfsd_open_break_lease(inode, NFSD_MAY_READ));
8878 if (status != nfserr_jukebox ||
8879 !nfsd_wait_for_delegreturn(rqstp, inode))
8880 return status;
8881 }
8882 if (!ncf->ncf_file_modified &&
8883 (ncf->ncf_initial_cinfo != ncf->ncf_cb_change ||
8884 ncf->ncf_cur_fsize != ncf->ncf_cb_fsize))
8885 ncf->ncf_file_modified = true;
8886 if (ncf->ncf_file_modified) {
8887 /*
8888 * Per section 10.4.3 of RFC 8881, the server would
8889 * not update the file's metadata with the client's
8890 * modified size
8891 */
8892 attrs.ia_mtime = attrs.ia_ctime = current_time(inode);
8893 attrs.ia_valid = ATTR_MTIME | ATTR_CTIME;
8894 setattr_copy(&nop_mnt_idmap, inode, &attrs);
8895 mark_inode_dirty(inode);
8896 ncf->ncf_cur_fsize = ncf->ncf_cb_fsize;
8897 *size = ncf->ncf_cur_fsize;
8898 *modified = true;
8899 }
8900 return 0;
8901 }
8902 break;
8903 }
8904 spin_unlock(&ctx->flc_lock);
8905 return 0;
8906 }
8907