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 "xdr4.h"
48 #include "xdr4cb.h"
49 #include "vfs.h"
50 #include "current_stateid.h"
51
52 #include "netns.h"
53 #include "pnfs.h"
54 #include "filecache.h"
55 #include "trace.h"
56
57 #define NFSDDBG_FACILITY NFSDDBG_PROC
58
59 #define all_ones {{~0,~0},~0}
60 static const stateid_t one_stateid = {
61 .si_generation = ~0,
62 .si_opaque = all_ones,
63 };
64 static const stateid_t zero_stateid = {
65 /* all fields zero */
66 };
67 static const stateid_t currentstateid = {
68 .si_generation = 1,
69 };
70 static const stateid_t close_stateid = {
71 .si_generation = 0xffffffffU,
72 };
73
74 static u64 current_sessionid = 1;
75
76 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
77 #define ONE_STATEID(stateid) (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
78 #define CURRENT_STATEID(stateid) (!memcmp((stateid), ¤tstateid, sizeof(stateid_t)))
79 #define CLOSE_STATEID(stateid) (!memcmp((stateid), &close_stateid, sizeof(stateid_t)))
80
81 /* forward declarations */
82 static bool check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner);
83 static void nfs4_free_ol_stateid(struct nfs4_stid *stid);
84 void nfsd4_end_grace(struct nfsd_net *nn);
85 static void _free_cpntf_state_locked(struct nfsd_net *nn, struct nfs4_cpntf_state *cps);
86
87 /* Locking: */
88
89 /*
90 * Currently used for the del_recall_lru and file hash table. In an
91 * effort to decrease the scope of the client_mutex, this spinlock may
92 * eventually cover more:
93 */
94 static DEFINE_SPINLOCK(state_lock);
95
96 enum nfsd4_st_mutex_lock_subclass {
97 OPEN_STATEID_MUTEX = 0,
98 LOCK_STATEID_MUTEX = 1,
99 };
100
101 /*
102 * A waitqueue for all in-progress 4.0 CLOSE operations that are waiting for
103 * the refcount on the open stateid to drop.
104 */
105 static DECLARE_WAIT_QUEUE_HEAD(close_wq);
106
107 /*
108 * A waitqueue where a writer to clients/#/ctl destroying a client can
109 * wait for cl_rpc_users to drop to 0 and then for the client to be
110 * unhashed.
111 */
112 static DECLARE_WAIT_QUEUE_HEAD(expiry_wq);
113
114 static struct kmem_cache *client_slab;
115 static struct kmem_cache *openowner_slab;
116 static struct kmem_cache *lockowner_slab;
117 static struct kmem_cache *file_slab;
118 static struct kmem_cache *stateid_slab;
119 static struct kmem_cache *deleg_slab;
120 static struct kmem_cache *odstate_slab;
121
122 static void free_session(struct nfsd4_session *);
123
124 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops;
125 static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops;
126
is_session_dead(struct nfsd4_session * ses)127 static bool is_session_dead(struct nfsd4_session *ses)
128 {
129 return ses->se_flags & NFS4_SESSION_DEAD;
130 }
131
mark_session_dead_locked(struct nfsd4_session * ses,int ref_held_by_me)132 static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me)
133 {
134 if (atomic_read(&ses->se_ref) > ref_held_by_me)
135 return nfserr_jukebox;
136 ses->se_flags |= NFS4_SESSION_DEAD;
137 return nfs_ok;
138 }
139
is_client_expired(struct nfs4_client * clp)140 static bool is_client_expired(struct nfs4_client *clp)
141 {
142 return clp->cl_time == 0;
143 }
144
get_client_locked(struct nfs4_client * clp)145 static __be32 get_client_locked(struct nfs4_client *clp)
146 {
147 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
148
149 lockdep_assert_held(&nn->client_lock);
150
151 if (is_client_expired(clp))
152 return nfserr_expired;
153 atomic_inc(&clp->cl_rpc_users);
154 return nfs_ok;
155 }
156
157 /* must be called under the client_lock */
158 static inline void
renew_client_locked(struct nfs4_client * clp)159 renew_client_locked(struct nfs4_client *clp)
160 {
161 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
162
163 if (is_client_expired(clp)) {
164 WARN_ON(1);
165 printk("%s: client (clientid %08x/%08x) already expired\n",
166 __func__,
167 clp->cl_clientid.cl_boot,
168 clp->cl_clientid.cl_id);
169 return;
170 }
171
172 list_move_tail(&clp->cl_lru, &nn->client_lru);
173 clp->cl_time = ktime_get_boottime_seconds();
174 }
175
put_client_renew_locked(struct nfs4_client * clp)176 static void put_client_renew_locked(struct nfs4_client *clp)
177 {
178 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
179
180 lockdep_assert_held(&nn->client_lock);
181
182 if (!atomic_dec_and_test(&clp->cl_rpc_users))
183 return;
184 if (!is_client_expired(clp))
185 renew_client_locked(clp);
186 else
187 wake_up_all(&expiry_wq);
188 }
189
put_client_renew(struct nfs4_client * clp)190 static void put_client_renew(struct nfs4_client *clp)
191 {
192 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
193
194 if (!atomic_dec_and_lock(&clp->cl_rpc_users, &nn->client_lock))
195 return;
196 if (!is_client_expired(clp))
197 renew_client_locked(clp);
198 else
199 wake_up_all(&expiry_wq);
200 spin_unlock(&nn->client_lock);
201 }
202
nfsd4_get_session_locked(struct nfsd4_session * ses)203 static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
204 {
205 __be32 status;
206
207 if (is_session_dead(ses))
208 return nfserr_badsession;
209 status = get_client_locked(ses->se_client);
210 if (status)
211 return status;
212 atomic_inc(&ses->se_ref);
213 return nfs_ok;
214 }
215
nfsd4_put_session_locked(struct nfsd4_session * ses)216 static void nfsd4_put_session_locked(struct nfsd4_session *ses)
217 {
218 struct nfs4_client *clp = ses->se_client;
219 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
220
221 lockdep_assert_held(&nn->client_lock);
222
223 if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
224 free_session(ses);
225 put_client_renew_locked(clp);
226 }
227
nfsd4_put_session(struct nfsd4_session * ses)228 static void nfsd4_put_session(struct nfsd4_session *ses)
229 {
230 struct nfs4_client *clp = ses->se_client;
231 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
232
233 spin_lock(&nn->client_lock);
234 nfsd4_put_session_locked(ses);
235 spin_unlock(&nn->client_lock);
236 }
237
238 static struct nfsd4_blocked_lock *
find_blocked_lock(struct nfs4_lockowner * lo,struct knfsd_fh * fh,struct nfsd_net * nn)239 find_blocked_lock(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
240 struct nfsd_net *nn)
241 {
242 struct nfsd4_blocked_lock *cur, *found = NULL;
243
244 spin_lock(&nn->blocked_locks_lock);
245 list_for_each_entry(cur, &lo->lo_blocked, nbl_list) {
246 if (fh_match(fh, &cur->nbl_fh)) {
247 list_del_init(&cur->nbl_list);
248 list_del_init(&cur->nbl_lru);
249 found = cur;
250 break;
251 }
252 }
253 spin_unlock(&nn->blocked_locks_lock);
254 if (found)
255 locks_delete_block(&found->nbl_lock);
256 return found;
257 }
258
259 static struct nfsd4_blocked_lock *
find_or_allocate_block(struct nfs4_lockowner * lo,struct knfsd_fh * fh,struct nfsd_net * nn)260 find_or_allocate_block(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
261 struct nfsd_net *nn)
262 {
263 struct nfsd4_blocked_lock *nbl;
264
265 nbl = find_blocked_lock(lo, fh, nn);
266 if (!nbl) {
267 nbl= kmalloc(sizeof(*nbl), GFP_KERNEL);
268 if (nbl) {
269 INIT_LIST_HEAD(&nbl->nbl_list);
270 INIT_LIST_HEAD(&nbl->nbl_lru);
271 fh_copy_shallow(&nbl->nbl_fh, fh);
272 locks_init_lock(&nbl->nbl_lock);
273 nfsd4_init_cb(&nbl->nbl_cb, lo->lo_owner.so_client,
274 &nfsd4_cb_notify_lock_ops,
275 NFSPROC4_CLNT_CB_NOTIFY_LOCK);
276 }
277 }
278 return nbl;
279 }
280
281 static void
free_blocked_lock(struct nfsd4_blocked_lock * nbl)282 free_blocked_lock(struct nfsd4_blocked_lock *nbl)
283 {
284 locks_delete_block(&nbl->nbl_lock);
285 locks_release_private(&nbl->nbl_lock);
286 kfree(nbl);
287 }
288
289 static void
remove_blocked_locks(struct nfs4_lockowner * lo)290 remove_blocked_locks(struct nfs4_lockowner *lo)
291 {
292 struct nfs4_client *clp = lo->lo_owner.so_client;
293 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
294 struct nfsd4_blocked_lock *nbl;
295 LIST_HEAD(reaplist);
296
297 /* Dequeue all blocked locks */
298 spin_lock(&nn->blocked_locks_lock);
299 while (!list_empty(&lo->lo_blocked)) {
300 nbl = list_first_entry(&lo->lo_blocked,
301 struct nfsd4_blocked_lock,
302 nbl_list);
303 list_del_init(&nbl->nbl_list);
304 list_move(&nbl->nbl_lru, &reaplist);
305 }
306 spin_unlock(&nn->blocked_locks_lock);
307
308 /* Now free them */
309 while (!list_empty(&reaplist)) {
310 nbl = list_first_entry(&reaplist, struct nfsd4_blocked_lock,
311 nbl_lru);
312 list_del_init(&nbl->nbl_lru);
313 free_blocked_lock(nbl);
314 }
315 }
316
317 static void
nfsd4_cb_notify_lock_prepare(struct nfsd4_callback * cb)318 nfsd4_cb_notify_lock_prepare(struct nfsd4_callback *cb)
319 {
320 struct nfsd4_blocked_lock *nbl = container_of(cb,
321 struct nfsd4_blocked_lock, nbl_cb);
322 locks_delete_block(&nbl->nbl_lock);
323 }
324
325 static int
nfsd4_cb_notify_lock_done(struct nfsd4_callback * cb,struct rpc_task * task)326 nfsd4_cb_notify_lock_done(struct nfsd4_callback *cb, struct rpc_task *task)
327 {
328 /*
329 * Since this is just an optimization, we don't try very hard if it
330 * turns out not to succeed. We'll requeue it on NFS4ERR_DELAY, and
331 * just quit trying on anything else.
332 */
333 switch (task->tk_status) {
334 case -NFS4ERR_DELAY:
335 rpc_delay(task, 1 * HZ);
336 return 0;
337 default:
338 return 1;
339 }
340 }
341
342 static void
nfsd4_cb_notify_lock_release(struct nfsd4_callback * cb)343 nfsd4_cb_notify_lock_release(struct nfsd4_callback *cb)
344 {
345 struct nfsd4_blocked_lock *nbl = container_of(cb,
346 struct nfsd4_blocked_lock, nbl_cb);
347
348 free_blocked_lock(nbl);
349 }
350
351 static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops = {
352 .prepare = nfsd4_cb_notify_lock_prepare,
353 .done = nfsd4_cb_notify_lock_done,
354 .release = nfsd4_cb_notify_lock_release,
355 };
356
357 /*
358 * We store the NONE, READ, WRITE, and BOTH bits separately in the
359 * st_{access,deny}_bmap field of the stateid, in order to track not
360 * only what share bits are currently in force, but also what
361 * combinations of share bits previous opens have used. This allows us
362 * to enforce the recommendation of rfc 3530 14.2.19 that the server
363 * return an error if the client attempt to downgrade to a combination
364 * of share bits not explicable by closing some of its previous opens.
365 *
366 * XXX: This enforcement is actually incomplete, since we don't keep
367 * track of access/deny bit combinations; so, e.g., we allow:
368 *
369 * OPEN allow read, deny write
370 * OPEN allow both, deny none
371 * DOWNGRADE allow read, deny none
372 *
373 * which we should reject.
374 */
375 static unsigned int
bmap_to_share_mode(unsigned long bmap)376 bmap_to_share_mode(unsigned long bmap)
377 {
378 int i;
379 unsigned int access = 0;
380
381 for (i = 1; i < 4; i++) {
382 if (test_bit(i, &bmap))
383 access |= i;
384 }
385 return access;
386 }
387
388 /* set share access for a given stateid */
389 static inline void
set_access(u32 access,struct nfs4_ol_stateid * stp)390 set_access(u32 access, struct nfs4_ol_stateid *stp)
391 {
392 unsigned char mask = 1 << access;
393
394 WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
395 stp->st_access_bmap |= mask;
396 }
397
398 /* clear share access for a given stateid */
399 static inline void
clear_access(u32 access,struct nfs4_ol_stateid * stp)400 clear_access(u32 access, struct nfs4_ol_stateid *stp)
401 {
402 unsigned char mask = 1 << access;
403
404 WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
405 stp->st_access_bmap &= ~mask;
406 }
407
408 /* test whether a given stateid has access */
409 static inline bool
test_access(u32 access,struct nfs4_ol_stateid * stp)410 test_access(u32 access, struct nfs4_ol_stateid *stp)
411 {
412 unsigned char mask = 1 << access;
413
414 return (bool)(stp->st_access_bmap & mask);
415 }
416
417 /* set share deny for a given stateid */
418 static inline void
set_deny(u32 deny,struct nfs4_ol_stateid * stp)419 set_deny(u32 deny, struct nfs4_ol_stateid *stp)
420 {
421 unsigned char mask = 1 << deny;
422
423 WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
424 stp->st_deny_bmap |= mask;
425 }
426
427 /* clear share deny for a given stateid */
428 static inline void
clear_deny(u32 deny,struct nfs4_ol_stateid * stp)429 clear_deny(u32 deny, struct nfs4_ol_stateid *stp)
430 {
431 unsigned char mask = 1 << deny;
432
433 WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
434 stp->st_deny_bmap &= ~mask;
435 }
436
437 /* test whether a given stateid is denying specific access */
438 static inline bool
test_deny(u32 deny,struct nfs4_ol_stateid * stp)439 test_deny(u32 deny, struct nfs4_ol_stateid *stp)
440 {
441 unsigned char mask = 1 << deny;
442
443 return (bool)(stp->st_deny_bmap & mask);
444 }
445
nfs4_access_to_omode(u32 access)446 static int nfs4_access_to_omode(u32 access)
447 {
448 switch (access & NFS4_SHARE_ACCESS_BOTH) {
449 case NFS4_SHARE_ACCESS_READ:
450 return O_RDONLY;
451 case NFS4_SHARE_ACCESS_WRITE:
452 return O_WRONLY;
453 case NFS4_SHARE_ACCESS_BOTH:
454 return O_RDWR;
455 }
456 WARN_ON_ONCE(1);
457 return O_RDONLY;
458 }
459
460 static inline int
access_permit_read(struct nfs4_ol_stateid * stp)461 access_permit_read(struct nfs4_ol_stateid *stp)
462 {
463 return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
464 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
465 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
466 }
467
468 static inline int
access_permit_write(struct nfs4_ol_stateid * stp)469 access_permit_write(struct nfs4_ol_stateid *stp)
470 {
471 return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
472 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
473 }
474
475 static inline struct nfs4_stateowner *
nfs4_get_stateowner(struct nfs4_stateowner * sop)476 nfs4_get_stateowner(struct nfs4_stateowner *sop)
477 {
478 atomic_inc(&sop->so_count);
479 return sop;
480 }
481
482 static int
same_owner_str(struct nfs4_stateowner * sop,struct xdr_netobj * owner)483 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner)
484 {
485 return (sop->so_owner.len == owner->len) &&
486 0 == memcmp(sop->so_owner.data, owner->data, owner->len);
487 }
488
489 static struct nfs4_openowner *
find_openstateowner_str_locked(unsigned int hashval,struct nfsd4_open * open,struct nfs4_client * clp)490 find_openstateowner_str_locked(unsigned int hashval, struct nfsd4_open *open,
491 struct nfs4_client *clp)
492 {
493 struct nfs4_stateowner *so;
494
495 lockdep_assert_held(&clp->cl_lock);
496
497 list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[hashval],
498 so_strhash) {
499 if (!so->so_is_open_owner)
500 continue;
501 if (same_owner_str(so, &open->op_owner))
502 return openowner(nfs4_get_stateowner(so));
503 }
504 return NULL;
505 }
506
507 static struct nfs4_openowner *
find_openstateowner_str(unsigned int hashval,struct nfsd4_open * open,struct nfs4_client * clp)508 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
509 struct nfs4_client *clp)
510 {
511 struct nfs4_openowner *oo;
512
513 spin_lock(&clp->cl_lock);
514 oo = find_openstateowner_str_locked(hashval, open, clp);
515 spin_unlock(&clp->cl_lock);
516 return oo;
517 }
518
519 static inline u32
opaque_hashval(const void * ptr,int nbytes)520 opaque_hashval(const void *ptr, int nbytes)
521 {
522 unsigned char *cptr = (unsigned char *) ptr;
523
524 u32 x = 0;
525 while (nbytes--) {
526 x *= 37;
527 x += *cptr++;
528 }
529 return x;
530 }
531
nfsd4_free_file_rcu(struct rcu_head * rcu)532 static void nfsd4_free_file_rcu(struct rcu_head *rcu)
533 {
534 struct nfs4_file *fp = container_of(rcu, struct nfs4_file, fi_rcu);
535
536 kmem_cache_free(file_slab, fp);
537 }
538
539 void
put_nfs4_file(struct nfs4_file * fi)540 put_nfs4_file(struct nfs4_file *fi)
541 {
542 might_lock(&state_lock);
543
544 if (refcount_dec_and_lock(&fi->fi_ref, &state_lock)) {
545 hlist_del_rcu(&fi->fi_hash);
546 spin_unlock(&state_lock);
547 WARN_ON_ONCE(!list_empty(&fi->fi_clnt_odstate));
548 WARN_ON_ONCE(!list_empty(&fi->fi_delegations));
549 call_rcu(&fi->fi_rcu, nfsd4_free_file_rcu);
550 }
551 }
552
553 static struct nfsd_file *
__nfs4_get_fd(struct nfs4_file * f,int oflag)554 __nfs4_get_fd(struct nfs4_file *f, int oflag)
555 {
556 if (f->fi_fds[oflag])
557 return nfsd_file_get(f->fi_fds[oflag]);
558 return NULL;
559 }
560
561 static struct nfsd_file *
find_writeable_file_locked(struct nfs4_file * f)562 find_writeable_file_locked(struct nfs4_file *f)
563 {
564 struct nfsd_file *ret;
565
566 lockdep_assert_held(&f->fi_lock);
567
568 ret = __nfs4_get_fd(f, O_WRONLY);
569 if (!ret)
570 ret = __nfs4_get_fd(f, O_RDWR);
571 return ret;
572 }
573
574 static struct nfsd_file *
find_writeable_file(struct nfs4_file * f)575 find_writeable_file(struct nfs4_file *f)
576 {
577 struct nfsd_file *ret;
578
579 spin_lock(&f->fi_lock);
580 ret = find_writeable_file_locked(f);
581 spin_unlock(&f->fi_lock);
582
583 return ret;
584 }
585
586 static struct nfsd_file *
find_readable_file_locked(struct nfs4_file * f)587 find_readable_file_locked(struct nfs4_file *f)
588 {
589 struct nfsd_file *ret;
590
591 lockdep_assert_held(&f->fi_lock);
592
593 ret = __nfs4_get_fd(f, O_RDONLY);
594 if (!ret)
595 ret = __nfs4_get_fd(f, O_RDWR);
596 return ret;
597 }
598
599 static struct nfsd_file *
find_readable_file(struct nfs4_file * f)600 find_readable_file(struct nfs4_file *f)
601 {
602 struct nfsd_file *ret;
603
604 spin_lock(&f->fi_lock);
605 ret = find_readable_file_locked(f);
606 spin_unlock(&f->fi_lock);
607
608 return ret;
609 }
610
611 struct nfsd_file *
find_any_file(struct nfs4_file * f)612 find_any_file(struct nfs4_file *f)
613 {
614 struct nfsd_file *ret;
615
616 if (!f)
617 return NULL;
618 spin_lock(&f->fi_lock);
619 ret = __nfs4_get_fd(f, O_RDWR);
620 if (!ret) {
621 ret = __nfs4_get_fd(f, O_WRONLY);
622 if (!ret)
623 ret = __nfs4_get_fd(f, O_RDONLY);
624 }
625 spin_unlock(&f->fi_lock);
626 return ret;
627 }
628
find_deleg_file(struct nfs4_file * f)629 static struct nfsd_file *find_deleg_file(struct nfs4_file *f)
630 {
631 struct nfsd_file *ret = NULL;
632
633 spin_lock(&f->fi_lock);
634 if (f->fi_deleg_file)
635 ret = nfsd_file_get(f->fi_deleg_file);
636 spin_unlock(&f->fi_lock);
637 return ret;
638 }
639
640 static atomic_long_t num_delegations;
641 unsigned long max_delegations;
642
643 /*
644 * Open owner state (share locks)
645 */
646
647 /* hash tables for lock and open owners */
648 #define OWNER_HASH_BITS 8
649 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
650 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
651
ownerstr_hashval(struct xdr_netobj * ownername)652 static unsigned int ownerstr_hashval(struct xdr_netobj *ownername)
653 {
654 unsigned int ret;
655
656 ret = opaque_hashval(ownername->data, ownername->len);
657 return ret & OWNER_HASH_MASK;
658 }
659
660 /* hash table for nfs4_file */
661 #define FILE_HASH_BITS 8
662 #define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
663
file_hashval(struct svc_fh * fh)664 static unsigned int file_hashval(struct svc_fh *fh)
665 {
666 struct inode *inode = d_inode(fh->fh_dentry);
667
668 /* XXX: why not (here & in file cache) use inode? */
669 return (unsigned int)hash_long(inode->i_ino, FILE_HASH_BITS);
670 }
671
672 static struct hlist_head file_hashtbl[FILE_HASH_SIZE];
673
674 static void
__nfs4_file_get_access(struct nfs4_file * fp,u32 access)675 __nfs4_file_get_access(struct nfs4_file *fp, u32 access)
676 {
677 lockdep_assert_held(&fp->fi_lock);
678
679 if (access & NFS4_SHARE_ACCESS_WRITE)
680 atomic_inc(&fp->fi_access[O_WRONLY]);
681 if (access & NFS4_SHARE_ACCESS_READ)
682 atomic_inc(&fp->fi_access[O_RDONLY]);
683 }
684
685 static __be32
nfs4_file_get_access(struct nfs4_file * fp,u32 access)686 nfs4_file_get_access(struct nfs4_file *fp, u32 access)
687 {
688 lockdep_assert_held(&fp->fi_lock);
689
690 /* Does this access mode make sense? */
691 if (access & ~NFS4_SHARE_ACCESS_BOTH)
692 return nfserr_inval;
693
694 /* Does it conflict with a deny mode already set? */
695 if ((access & fp->fi_share_deny) != 0)
696 return nfserr_share_denied;
697
698 __nfs4_file_get_access(fp, access);
699 return nfs_ok;
700 }
701
nfs4_file_check_deny(struct nfs4_file * fp,u32 deny)702 static __be32 nfs4_file_check_deny(struct nfs4_file *fp, u32 deny)
703 {
704 /* Common case is that there is no deny mode. */
705 if (deny) {
706 /* Does this deny mode make sense? */
707 if (deny & ~NFS4_SHARE_DENY_BOTH)
708 return nfserr_inval;
709
710 if ((deny & NFS4_SHARE_DENY_READ) &&
711 atomic_read(&fp->fi_access[O_RDONLY]))
712 return nfserr_share_denied;
713
714 if ((deny & NFS4_SHARE_DENY_WRITE) &&
715 atomic_read(&fp->fi_access[O_WRONLY]))
716 return nfserr_share_denied;
717 }
718 return nfs_ok;
719 }
720
__nfs4_file_put_access(struct nfs4_file * fp,int oflag)721 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
722 {
723 might_lock(&fp->fi_lock);
724
725 if (atomic_dec_and_lock(&fp->fi_access[oflag], &fp->fi_lock)) {
726 struct nfsd_file *f1 = NULL;
727 struct nfsd_file *f2 = NULL;
728
729 swap(f1, fp->fi_fds[oflag]);
730 if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
731 swap(f2, fp->fi_fds[O_RDWR]);
732 spin_unlock(&fp->fi_lock);
733 if (f1)
734 nfsd_file_put(f1);
735 if (f2)
736 nfsd_file_put(f2);
737 }
738 }
739
nfs4_file_put_access(struct nfs4_file * fp,u32 access)740 static void nfs4_file_put_access(struct nfs4_file *fp, u32 access)
741 {
742 WARN_ON_ONCE(access & ~NFS4_SHARE_ACCESS_BOTH);
743
744 if (access & NFS4_SHARE_ACCESS_WRITE)
745 __nfs4_file_put_access(fp, O_WRONLY);
746 if (access & NFS4_SHARE_ACCESS_READ)
747 __nfs4_file_put_access(fp, O_RDONLY);
748 }
749
750 /*
751 * Allocate a new open/delegation state counter. This is needed for
752 * pNFS for proper return on close semantics.
753 *
754 * Note that we only allocate it for pNFS-enabled exports, otherwise
755 * all pointers to struct nfs4_clnt_odstate are always NULL.
756 */
757 static struct nfs4_clnt_odstate *
alloc_clnt_odstate(struct nfs4_client * clp)758 alloc_clnt_odstate(struct nfs4_client *clp)
759 {
760 struct nfs4_clnt_odstate *co;
761
762 co = kmem_cache_zalloc(odstate_slab, GFP_KERNEL);
763 if (co) {
764 co->co_client = clp;
765 refcount_set(&co->co_odcount, 1);
766 }
767 return co;
768 }
769
770 static void
hash_clnt_odstate_locked(struct nfs4_clnt_odstate * co)771 hash_clnt_odstate_locked(struct nfs4_clnt_odstate *co)
772 {
773 struct nfs4_file *fp = co->co_file;
774
775 lockdep_assert_held(&fp->fi_lock);
776 list_add(&co->co_perfile, &fp->fi_clnt_odstate);
777 }
778
779 static inline void
get_clnt_odstate(struct nfs4_clnt_odstate * co)780 get_clnt_odstate(struct nfs4_clnt_odstate *co)
781 {
782 if (co)
783 refcount_inc(&co->co_odcount);
784 }
785
786 static void
put_clnt_odstate(struct nfs4_clnt_odstate * co)787 put_clnt_odstate(struct nfs4_clnt_odstate *co)
788 {
789 struct nfs4_file *fp;
790
791 if (!co)
792 return;
793
794 fp = co->co_file;
795 if (refcount_dec_and_lock(&co->co_odcount, &fp->fi_lock)) {
796 list_del(&co->co_perfile);
797 spin_unlock(&fp->fi_lock);
798
799 nfsd4_return_all_file_layouts(co->co_client, fp);
800 kmem_cache_free(odstate_slab, co);
801 }
802 }
803
804 static struct nfs4_clnt_odstate *
find_or_hash_clnt_odstate(struct nfs4_file * fp,struct nfs4_clnt_odstate * new)805 find_or_hash_clnt_odstate(struct nfs4_file *fp, struct nfs4_clnt_odstate *new)
806 {
807 struct nfs4_clnt_odstate *co;
808 struct nfs4_client *cl;
809
810 if (!new)
811 return NULL;
812
813 cl = new->co_client;
814
815 spin_lock(&fp->fi_lock);
816 list_for_each_entry(co, &fp->fi_clnt_odstate, co_perfile) {
817 if (co->co_client == cl) {
818 get_clnt_odstate(co);
819 goto out;
820 }
821 }
822 co = new;
823 co->co_file = fp;
824 hash_clnt_odstate_locked(new);
825 out:
826 spin_unlock(&fp->fi_lock);
827 return co;
828 }
829
nfs4_alloc_stid(struct nfs4_client * cl,struct kmem_cache * slab,void (* sc_free)(struct nfs4_stid *))830 struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab,
831 void (*sc_free)(struct nfs4_stid *))
832 {
833 struct nfs4_stid *stid;
834 int new_id;
835
836 stid = kmem_cache_zalloc(slab, GFP_KERNEL);
837 if (!stid)
838 return NULL;
839
840 idr_preload(GFP_KERNEL);
841 spin_lock(&cl->cl_lock);
842 /* Reserving 0 for start of file in nfsdfs "states" file: */
843 new_id = idr_alloc_cyclic(&cl->cl_stateids, stid, 1, 0, GFP_NOWAIT);
844 spin_unlock(&cl->cl_lock);
845 idr_preload_end();
846 if (new_id < 0)
847 goto out_free;
848
849 stid->sc_free = sc_free;
850 stid->sc_client = cl;
851 stid->sc_stateid.si_opaque.so_id = new_id;
852 stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
853 /* Will be incremented before return to client: */
854 refcount_set(&stid->sc_count, 1);
855 spin_lock_init(&stid->sc_lock);
856 INIT_LIST_HEAD(&stid->sc_cp_list);
857
858 /*
859 * It shouldn't be a problem to reuse an opaque stateid value.
860 * I don't think it is for 4.1. But with 4.0 I worry that, for
861 * example, a stray write retransmission could be accepted by
862 * the server when it should have been rejected. Therefore,
863 * adopt a trick from the sctp code to attempt to maximize the
864 * amount of time until an id is reused, by ensuring they always
865 * "increase" (mod INT_MAX):
866 */
867 return stid;
868 out_free:
869 kmem_cache_free(slab, stid);
870 return NULL;
871 }
872
873 /*
874 * Create a unique stateid_t to represent each COPY.
875 */
nfs4_init_cp_state(struct nfsd_net * nn,copy_stateid_t * stid,unsigned char sc_type)876 static int nfs4_init_cp_state(struct nfsd_net *nn, copy_stateid_t *stid,
877 unsigned char sc_type)
878 {
879 int new_id;
880
881 stid->stid.si_opaque.so_clid.cl_boot = (u32)nn->boot_time;
882 stid->stid.si_opaque.so_clid.cl_id = nn->s2s_cp_cl_id;
883 stid->sc_type = sc_type;
884
885 idr_preload(GFP_KERNEL);
886 spin_lock(&nn->s2s_cp_lock);
887 new_id = idr_alloc_cyclic(&nn->s2s_cp_stateids, stid, 0, 0, GFP_NOWAIT);
888 stid->stid.si_opaque.so_id = new_id;
889 stid->stid.si_generation = 1;
890 spin_unlock(&nn->s2s_cp_lock);
891 idr_preload_end();
892 if (new_id < 0)
893 return 0;
894 return 1;
895 }
896
nfs4_init_copy_state(struct nfsd_net * nn,struct nfsd4_copy * copy)897 int nfs4_init_copy_state(struct nfsd_net *nn, struct nfsd4_copy *copy)
898 {
899 return nfs4_init_cp_state(nn, ©->cp_stateid, NFS4_COPY_STID);
900 }
901
nfs4_alloc_init_cpntf_state(struct nfsd_net * nn,struct nfs4_stid * p_stid)902 struct nfs4_cpntf_state *nfs4_alloc_init_cpntf_state(struct nfsd_net *nn,
903 struct nfs4_stid *p_stid)
904 {
905 struct nfs4_cpntf_state *cps;
906
907 cps = kzalloc(sizeof(struct nfs4_cpntf_state), GFP_KERNEL);
908 if (!cps)
909 return NULL;
910 cps->cpntf_time = ktime_get_boottime_seconds();
911 refcount_set(&cps->cp_stateid.sc_count, 1);
912 if (!nfs4_init_cp_state(nn, &cps->cp_stateid, NFS4_COPYNOTIFY_STID))
913 goto out_free;
914 spin_lock(&nn->s2s_cp_lock);
915 list_add(&cps->cp_list, &p_stid->sc_cp_list);
916 spin_unlock(&nn->s2s_cp_lock);
917 return cps;
918 out_free:
919 kfree(cps);
920 return NULL;
921 }
922
nfs4_free_copy_state(struct nfsd4_copy * copy)923 void nfs4_free_copy_state(struct nfsd4_copy *copy)
924 {
925 struct nfsd_net *nn;
926
927 WARN_ON_ONCE(copy->cp_stateid.sc_type != NFS4_COPY_STID);
928 nn = net_generic(copy->cp_clp->net, nfsd_net_id);
929 spin_lock(&nn->s2s_cp_lock);
930 idr_remove(&nn->s2s_cp_stateids,
931 copy->cp_stateid.stid.si_opaque.so_id);
932 spin_unlock(&nn->s2s_cp_lock);
933 }
934
nfs4_free_cpntf_statelist(struct net * net,struct nfs4_stid * stid)935 static void nfs4_free_cpntf_statelist(struct net *net, struct nfs4_stid *stid)
936 {
937 struct nfs4_cpntf_state *cps;
938 struct nfsd_net *nn;
939
940 nn = net_generic(net, nfsd_net_id);
941 spin_lock(&nn->s2s_cp_lock);
942 while (!list_empty(&stid->sc_cp_list)) {
943 cps = list_first_entry(&stid->sc_cp_list,
944 struct nfs4_cpntf_state, cp_list);
945 _free_cpntf_state_locked(nn, cps);
946 }
947 spin_unlock(&nn->s2s_cp_lock);
948 }
949
nfs4_alloc_open_stateid(struct nfs4_client * clp)950 static struct nfs4_ol_stateid * nfs4_alloc_open_stateid(struct nfs4_client *clp)
951 {
952 struct nfs4_stid *stid;
953
954 stid = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_ol_stateid);
955 if (!stid)
956 return NULL;
957
958 return openlockstateid(stid);
959 }
960
nfs4_free_deleg(struct nfs4_stid * stid)961 static void nfs4_free_deleg(struct nfs4_stid *stid)
962 {
963 kmem_cache_free(deleg_slab, stid);
964 atomic_long_dec(&num_delegations);
965 }
966
967 /*
968 * When we recall a delegation, we should be careful not to hand it
969 * out again straight away.
970 * To ensure this we keep a pair of bloom filters ('new' and 'old')
971 * in which the filehandles of recalled delegations are "stored".
972 * If a filehandle appear in either filter, a delegation is blocked.
973 * When a delegation is recalled, the filehandle is stored in the "new"
974 * filter.
975 * Every 30 seconds we swap the filters and clear the "new" one,
976 * unless both are empty of course.
977 *
978 * Each filter is 256 bits. We hash the filehandle to 32bit and use the
979 * low 3 bytes as hash-table indices.
980 *
981 * 'blocked_delegations_lock', which is always taken in block_delegations(),
982 * is used to manage concurrent access. Testing does not need the lock
983 * except when swapping the two filters.
984 */
985 static DEFINE_SPINLOCK(blocked_delegations_lock);
986 static struct bloom_pair {
987 int entries, old_entries;
988 time64_t swap_time;
989 int new; /* index into 'set' */
990 DECLARE_BITMAP(set[2], 256);
991 } blocked_delegations;
992
delegation_blocked(struct knfsd_fh * fh)993 static int delegation_blocked(struct knfsd_fh *fh)
994 {
995 u32 hash;
996 struct bloom_pair *bd = &blocked_delegations;
997
998 if (bd->entries == 0)
999 return 0;
1000 if (ktime_get_seconds() - bd->swap_time > 30) {
1001 spin_lock(&blocked_delegations_lock);
1002 if (ktime_get_seconds() - bd->swap_time > 30) {
1003 bd->entries -= bd->old_entries;
1004 bd->old_entries = bd->entries;
1005 memset(bd->set[bd->new], 0,
1006 sizeof(bd->set[0]));
1007 bd->new = 1-bd->new;
1008 bd->swap_time = ktime_get_seconds();
1009 }
1010 spin_unlock(&blocked_delegations_lock);
1011 }
1012 hash = jhash(&fh->fh_base, fh->fh_size, 0);
1013 if (test_bit(hash&255, bd->set[0]) &&
1014 test_bit((hash>>8)&255, bd->set[0]) &&
1015 test_bit((hash>>16)&255, bd->set[0]))
1016 return 1;
1017
1018 if (test_bit(hash&255, bd->set[1]) &&
1019 test_bit((hash>>8)&255, bd->set[1]) &&
1020 test_bit((hash>>16)&255, bd->set[1]))
1021 return 1;
1022
1023 return 0;
1024 }
1025
block_delegations(struct knfsd_fh * fh)1026 static void block_delegations(struct knfsd_fh *fh)
1027 {
1028 u32 hash;
1029 struct bloom_pair *bd = &blocked_delegations;
1030
1031 hash = jhash(&fh->fh_base, fh->fh_size, 0);
1032
1033 spin_lock(&blocked_delegations_lock);
1034 __set_bit(hash&255, bd->set[bd->new]);
1035 __set_bit((hash>>8)&255, bd->set[bd->new]);
1036 __set_bit((hash>>16)&255, bd->set[bd->new]);
1037 if (bd->entries == 0)
1038 bd->swap_time = ktime_get_seconds();
1039 bd->entries += 1;
1040 spin_unlock(&blocked_delegations_lock);
1041 }
1042
1043 static struct nfs4_delegation *
alloc_init_deleg(struct nfs4_client * clp,struct nfs4_file * fp,struct svc_fh * current_fh,struct nfs4_clnt_odstate * odstate)1044 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_file *fp,
1045 struct svc_fh *current_fh,
1046 struct nfs4_clnt_odstate *odstate)
1047 {
1048 struct nfs4_delegation *dp;
1049 long n;
1050
1051 dprintk("NFSD alloc_init_deleg\n");
1052 n = atomic_long_inc_return(&num_delegations);
1053 if (n < 0 || n > max_delegations)
1054 goto out_dec;
1055 if (delegation_blocked(¤t_fh->fh_handle))
1056 goto out_dec;
1057 dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab, nfs4_free_deleg));
1058 if (dp == NULL)
1059 goto out_dec;
1060
1061 /*
1062 * delegation seqid's are never incremented. The 4.1 special
1063 * meaning of seqid 0 isn't meaningful, really, but let's avoid
1064 * 0 anyway just for consistency and use 1:
1065 */
1066 dp->dl_stid.sc_stateid.si_generation = 1;
1067 INIT_LIST_HEAD(&dp->dl_perfile);
1068 INIT_LIST_HEAD(&dp->dl_perclnt);
1069 INIT_LIST_HEAD(&dp->dl_recall_lru);
1070 dp->dl_clnt_odstate = odstate;
1071 get_clnt_odstate(odstate);
1072 dp->dl_type = NFS4_OPEN_DELEGATE_READ;
1073 dp->dl_retries = 1;
1074 nfsd4_init_cb(&dp->dl_recall, dp->dl_stid.sc_client,
1075 &nfsd4_cb_recall_ops, NFSPROC4_CLNT_CB_RECALL);
1076 get_nfs4_file(fp);
1077 dp->dl_stid.sc_file = fp;
1078 return dp;
1079 out_dec:
1080 atomic_long_dec(&num_delegations);
1081 return NULL;
1082 }
1083
1084 void
nfs4_put_stid(struct nfs4_stid * s)1085 nfs4_put_stid(struct nfs4_stid *s)
1086 {
1087 struct nfs4_file *fp = s->sc_file;
1088 struct nfs4_client *clp = s->sc_client;
1089
1090 might_lock(&clp->cl_lock);
1091
1092 if (!refcount_dec_and_lock(&s->sc_count, &clp->cl_lock)) {
1093 wake_up_all(&close_wq);
1094 return;
1095 }
1096 idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
1097 nfs4_free_cpntf_statelist(clp->net, s);
1098 spin_unlock(&clp->cl_lock);
1099 s->sc_free(s);
1100 if (fp)
1101 put_nfs4_file(fp);
1102 }
1103
1104 void
nfs4_inc_and_copy_stateid(stateid_t * dst,struct nfs4_stid * stid)1105 nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid)
1106 {
1107 stateid_t *src = &stid->sc_stateid;
1108
1109 spin_lock(&stid->sc_lock);
1110 if (unlikely(++src->si_generation == 0))
1111 src->si_generation = 1;
1112 memcpy(dst, src, sizeof(*dst));
1113 spin_unlock(&stid->sc_lock);
1114 }
1115
put_deleg_file(struct nfs4_file * fp)1116 static void put_deleg_file(struct nfs4_file *fp)
1117 {
1118 struct nfsd_file *nf = NULL;
1119
1120 spin_lock(&fp->fi_lock);
1121 if (--fp->fi_delegees == 0)
1122 swap(nf, fp->fi_deleg_file);
1123 spin_unlock(&fp->fi_lock);
1124
1125 if (nf)
1126 nfsd_file_put(nf);
1127 }
1128
nfs4_unlock_deleg_lease(struct nfs4_delegation * dp)1129 static void nfs4_unlock_deleg_lease(struct nfs4_delegation *dp)
1130 {
1131 struct nfs4_file *fp = dp->dl_stid.sc_file;
1132 struct nfsd_file *nf = fp->fi_deleg_file;
1133
1134 WARN_ON_ONCE(!fp->fi_delegees);
1135
1136 vfs_setlease(nf->nf_file, F_UNLCK, NULL, (void **)&dp);
1137 put_deleg_file(fp);
1138 }
1139
destroy_unhashed_deleg(struct nfs4_delegation * dp)1140 static void destroy_unhashed_deleg(struct nfs4_delegation *dp)
1141 {
1142 put_clnt_odstate(dp->dl_clnt_odstate);
1143 nfs4_unlock_deleg_lease(dp);
1144 nfs4_put_stid(&dp->dl_stid);
1145 }
1146
nfs4_unhash_stid(struct nfs4_stid * s)1147 void nfs4_unhash_stid(struct nfs4_stid *s)
1148 {
1149 s->sc_type = 0;
1150 }
1151
1152 /**
1153 * nfs4_delegation_exists - Discover if this delegation already exists
1154 * @clp: a pointer to the nfs4_client we're granting a delegation to
1155 * @fp: a pointer to the nfs4_file we're granting a delegation on
1156 *
1157 * Return:
1158 * On success: true iff an existing delegation is found
1159 */
1160
1161 static bool
nfs4_delegation_exists(struct nfs4_client * clp,struct nfs4_file * fp)1162 nfs4_delegation_exists(struct nfs4_client *clp, struct nfs4_file *fp)
1163 {
1164 struct nfs4_delegation *searchdp = NULL;
1165 struct nfs4_client *searchclp = NULL;
1166
1167 lockdep_assert_held(&state_lock);
1168 lockdep_assert_held(&fp->fi_lock);
1169
1170 list_for_each_entry(searchdp, &fp->fi_delegations, dl_perfile) {
1171 searchclp = searchdp->dl_stid.sc_client;
1172 if (clp == searchclp) {
1173 return true;
1174 }
1175 }
1176 return false;
1177 }
1178
1179 /**
1180 * hash_delegation_locked - Add a delegation to the appropriate lists
1181 * @dp: a pointer to the nfs4_delegation we are adding.
1182 * @fp: a pointer to the nfs4_file we're granting a delegation on
1183 *
1184 * Return:
1185 * On success: NULL if the delegation was successfully hashed.
1186 *
1187 * On error: -EAGAIN if one was previously granted to this
1188 * nfs4_client for this nfs4_file. Delegation is not hashed.
1189 *
1190 */
1191
1192 static int
hash_delegation_locked(struct nfs4_delegation * dp,struct nfs4_file * fp)1193 hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
1194 {
1195 struct nfs4_client *clp = dp->dl_stid.sc_client;
1196
1197 lockdep_assert_held(&state_lock);
1198 lockdep_assert_held(&fp->fi_lock);
1199
1200 if (nfs4_delegation_exists(clp, fp))
1201 return -EAGAIN;
1202 refcount_inc(&dp->dl_stid.sc_count);
1203 dp->dl_stid.sc_type = NFS4_DELEG_STID;
1204 list_add(&dp->dl_perfile, &fp->fi_delegations);
1205 list_add(&dp->dl_perclnt, &clp->cl_delegations);
1206 return 0;
1207 }
1208
1209 static bool
unhash_delegation_locked(struct nfs4_delegation * dp)1210 unhash_delegation_locked(struct nfs4_delegation *dp)
1211 {
1212 struct nfs4_file *fp = dp->dl_stid.sc_file;
1213
1214 lockdep_assert_held(&state_lock);
1215
1216 if (list_empty(&dp->dl_perfile))
1217 return false;
1218
1219 dp->dl_stid.sc_type = NFS4_CLOSED_DELEG_STID;
1220 /* Ensure that deleg break won't try to requeue it */
1221 ++dp->dl_time;
1222 spin_lock(&fp->fi_lock);
1223 list_del_init(&dp->dl_perclnt);
1224 list_del_init(&dp->dl_recall_lru);
1225 list_del_init(&dp->dl_perfile);
1226 spin_unlock(&fp->fi_lock);
1227 return true;
1228 }
1229
destroy_delegation(struct nfs4_delegation * dp)1230 static void destroy_delegation(struct nfs4_delegation *dp)
1231 {
1232 bool unhashed;
1233
1234 spin_lock(&state_lock);
1235 unhashed = unhash_delegation_locked(dp);
1236 spin_unlock(&state_lock);
1237 if (unhashed)
1238 destroy_unhashed_deleg(dp);
1239 }
1240
revoke_delegation(struct nfs4_delegation * dp)1241 static void revoke_delegation(struct nfs4_delegation *dp)
1242 {
1243 struct nfs4_client *clp = dp->dl_stid.sc_client;
1244
1245 WARN_ON(!list_empty(&dp->dl_recall_lru));
1246
1247 if (clp->cl_minorversion) {
1248 dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID;
1249 refcount_inc(&dp->dl_stid.sc_count);
1250 spin_lock(&clp->cl_lock);
1251 list_add(&dp->dl_recall_lru, &clp->cl_revoked);
1252 spin_unlock(&clp->cl_lock);
1253 }
1254 destroy_unhashed_deleg(dp);
1255 }
1256
1257 /*
1258 * SETCLIENTID state
1259 */
1260
clientid_hashval(u32 id)1261 static unsigned int clientid_hashval(u32 id)
1262 {
1263 return id & CLIENT_HASH_MASK;
1264 }
1265
clientstr_hashval(struct xdr_netobj name)1266 static unsigned int clientstr_hashval(struct xdr_netobj name)
1267 {
1268 return opaque_hashval(name.data, 8) & CLIENT_HASH_MASK;
1269 }
1270
1271 /*
1272 * A stateid that had a deny mode associated with it is being released
1273 * or downgraded. Recalculate the deny mode on the file.
1274 */
1275 static void
recalculate_deny_mode(struct nfs4_file * fp)1276 recalculate_deny_mode(struct nfs4_file *fp)
1277 {
1278 struct nfs4_ol_stateid *stp;
1279
1280 spin_lock(&fp->fi_lock);
1281 fp->fi_share_deny = 0;
1282 list_for_each_entry(stp, &fp->fi_stateids, st_perfile)
1283 fp->fi_share_deny |= bmap_to_share_mode(stp->st_deny_bmap);
1284 spin_unlock(&fp->fi_lock);
1285 }
1286
1287 static void
reset_union_bmap_deny(u32 deny,struct nfs4_ol_stateid * stp)1288 reset_union_bmap_deny(u32 deny, struct nfs4_ol_stateid *stp)
1289 {
1290 int i;
1291 bool change = false;
1292
1293 for (i = 1; i < 4; i++) {
1294 if ((i & deny) != i) {
1295 change = true;
1296 clear_deny(i, stp);
1297 }
1298 }
1299
1300 /* Recalculate per-file deny mode if there was a change */
1301 if (change)
1302 recalculate_deny_mode(stp->st_stid.sc_file);
1303 }
1304
1305 /* release all access and file references for a given stateid */
1306 static void
release_all_access(struct nfs4_ol_stateid * stp)1307 release_all_access(struct nfs4_ol_stateid *stp)
1308 {
1309 int i;
1310 struct nfs4_file *fp = stp->st_stid.sc_file;
1311
1312 if (fp && stp->st_deny_bmap != 0)
1313 recalculate_deny_mode(fp);
1314
1315 for (i = 1; i < 4; i++) {
1316 if (test_access(i, stp))
1317 nfs4_file_put_access(stp->st_stid.sc_file, i);
1318 clear_access(i, stp);
1319 }
1320 }
1321
nfs4_free_stateowner(struct nfs4_stateowner * sop)1322 static inline void nfs4_free_stateowner(struct nfs4_stateowner *sop)
1323 {
1324 kfree(sop->so_owner.data);
1325 sop->so_ops->so_free(sop);
1326 }
1327
nfs4_put_stateowner(struct nfs4_stateowner * sop)1328 static void nfs4_put_stateowner(struct nfs4_stateowner *sop)
1329 {
1330 struct nfs4_client *clp = sop->so_client;
1331
1332 might_lock(&clp->cl_lock);
1333
1334 if (!atomic_dec_and_lock(&sop->so_count, &clp->cl_lock))
1335 return;
1336 sop->so_ops->so_unhash(sop);
1337 spin_unlock(&clp->cl_lock);
1338 nfs4_free_stateowner(sop);
1339 }
1340
1341 static bool
nfs4_ol_stateid_unhashed(const struct nfs4_ol_stateid * stp)1342 nfs4_ol_stateid_unhashed(const struct nfs4_ol_stateid *stp)
1343 {
1344 return list_empty(&stp->st_perfile);
1345 }
1346
unhash_ol_stateid(struct nfs4_ol_stateid * stp)1347 static bool unhash_ol_stateid(struct nfs4_ol_stateid *stp)
1348 {
1349 struct nfs4_file *fp = stp->st_stid.sc_file;
1350
1351 lockdep_assert_held(&stp->st_stateowner->so_client->cl_lock);
1352
1353 if (list_empty(&stp->st_perfile))
1354 return false;
1355
1356 spin_lock(&fp->fi_lock);
1357 list_del_init(&stp->st_perfile);
1358 spin_unlock(&fp->fi_lock);
1359 list_del(&stp->st_perstateowner);
1360 return true;
1361 }
1362
nfs4_free_ol_stateid(struct nfs4_stid * stid)1363 static void nfs4_free_ol_stateid(struct nfs4_stid *stid)
1364 {
1365 struct nfs4_ol_stateid *stp = openlockstateid(stid);
1366
1367 put_clnt_odstate(stp->st_clnt_odstate);
1368 release_all_access(stp);
1369 if (stp->st_stateowner)
1370 nfs4_put_stateowner(stp->st_stateowner);
1371 kmem_cache_free(stateid_slab, stid);
1372 }
1373
nfs4_free_lock_stateid(struct nfs4_stid * stid)1374 static void nfs4_free_lock_stateid(struct nfs4_stid *stid)
1375 {
1376 struct nfs4_ol_stateid *stp = openlockstateid(stid);
1377 struct nfs4_lockowner *lo = lockowner(stp->st_stateowner);
1378 struct nfsd_file *nf;
1379
1380 nf = find_any_file(stp->st_stid.sc_file);
1381 if (nf) {
1382 get_file(nf->nf_file);
1383 filp_close(nf->nf_file, (fl_owner_t)lo);
1384 nfsd_file_put(nf);
1385 }
1386 nfs4_free_ol_stateid(stid);
1387 }
1388
1389 /*
1390 * Put the persistent reference to an already unhashed generic stateid, while
1391 * holding the cl_lock. If it's the last reference, then put it onto the
1392 * reaplist for later destruction.
1393 */
put_ol_stateid_locked(struct nfs4_ol_stateid * stp,struct list_head * reaplist)1394 static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp,
1395 struct list_head *reaplist)
1396 {
1397 struct nfs4_stid *s = &stp->st_stid;
1398 struct nfs4_client *clp = s->sc_client;
1399
1400 lockdep_assert_held(&clp->cl_lock);
1401
1402 WARN_ON_ONCE(!list_empty(&stp->st_locks));
1403
1404 if (!refcount_dec_and_test(&s->sc_count)) {
1405 wake_up_all(&close_wq);
1406 return;
1407 }
1408
1409 idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
1410 list_add(&stp->st_locks, reaplist);
1411 }
1412
unhash_lock_stateid(struct nfs4_ol_stateid * stp)1413 static bool unhash_lock_stateid(struct nfs4_ol_stateid *stp)
1414 {
1415 lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1416
1417 if (!unhash_ol_stateid(stp))
1418 return false;
1419 list_del_init(&stp->st_locks);
1420 nfs4_unhash_stid(&stp->st_stid);
1421 return true;
1422 }
1423
release_lock_stateid(struct nfs4_ol_stateid * stp)1424 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
1425 {
1426 struct nfs4_client *clp = stp->st_stid.sc_client;
1427 bool unhashed;
1428
1429 spin_lock(&clp->cl_lock);
1430 unhashed = unhash_lock_stateid(stp);
1431 spin_unlock(&clp->cl_lock);
1432 if (unhashed)
1433 nfs4_put_stid(&stp->st_stid);
1434 }
1435
unhash_lockowner_locked(struct nfs4_lockowner * lo)1436 static void unhash_lockowner_locked(struct nfs4_lockowner *lo)
1437 {
1438 struct nfs4_client *clp = lo->lo_owner.so_client;
1439
1440 lockdep_assert_held(&clp->cl_lock);
1441
1442 list_del_init(&lo->lo_owner.so_strhash);
1443 }
1444
1445 /*
1446 * Free a list of generic stateids that were collected earlier after being
1447 * fully unhashed.
1448 */
1449 static void
free_ol_stateid_reaplist(struct list_head * reaplist)1450 free_ol_stateid_reaplist(struct list_head *reaplist)
1451 {
1452 struct nfs4_ol_stateid *stp;
1453 struct nfs4_file *fp;
1454
1455 might_sleep();
1456
1457 while (!list_empty(reaplist)) {
1458 stp = list_first_entry(reaplist, struct nfs4_ol_stateid,
1459 st_locks);
1460 list_del(&stp->st_locks);
1461 fp = stp->st_stid.sc_file;
1462 stp->st_stid.sc_free(&stp->st_stid);
1463 if (fp)
1464 put_nfs4_file(fp);
1465 }
1466 }
1467
release_open_stateid_locks(struct nfs4_ol_stateid * open_stp,struct list_head * reaplist)1468 static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp,
1469 struct list_head *reaplist)
1470 {
1471 struct nfs4_ol_stateid *stp;
1472
1473 lockdep_assert_held(&open_stp->st_stid.sc_client->cl_lock);
1474
1475 while (!list_empty(&open_stp->st_locks)) {
1476 stp = list_entry(open_stp->st_locks.next,
1477 struct nfs4_ol_stateid, st_locks);
1478 WARN_ON(!unhash_lock_stateid(stp));
1479 put_ol_stateid_locked(stp, reaplist);
1480 }
1481 }
1482
unhash_open_stateid(struct nfs4_ol_stateid * stp,struct list_head * reaplist)1483 static bool unhash_open_stateid(struct nfs4_ol_stateid *stp,
1484 struct list_head *reaplist)
1485 {
1486 lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1487
1488 if (!unhash_ol_stateid(stp))
1489 return false;
1490 release_open_stateid_locks(stp, reaplist);
1491 return true;
1492 }
1493
release_open_stateid(struct nfs4_ol_stateid * stp)1494 static void release_open_stateid(struct nfs4_ol_stateid *stp)
1495 {
1496 LIST_HEAD(reaplist);
1497
1498 spin_lock(&stp->st_stid.sc_client->cl_lock);
1499 if (unhash_open_stateid(stp, &reaplist))
1500 put_ol_stateid_locked(stp, &reaplist);
1501 spin_unlock(&stp->st_stid.sc_client->cl_lock);
1502 free_ol_stateid_reaplist(&reaplist);
1503 }
1504
unhash_openowner_locked(struct nfs4_openowner * oo)1505 static void unhash_openowner_locked(struct nfs4_openowner *oo)
1506 {
1507 struct nfs4_client *clp = oo->oo_owner.so_client;
1508
1509 lockdep_assert_held(&clp->cl_lock);
1510
1511 list_del_init(&oo->oo_owner.so_strhash);
1512 list_del_init(&oo->oo_perclient);
1513 }
1514
release_last_closed_stateid(struct nfs4_openowner * oo)1515 static void release_last_closed_stateid(struct nfs4_openowner *oo)
1516 {
1517 struct nfsd_net *nn = net_generic(oo->oo_owner.so_client->net,
1518 nfsd_net_id);
1519 struct nfs4_ol_stateid *s;
1520
1521 spin_lock(&nn->client_lock);
1522 s = oo->oo_last_closed_stid;
1523 if (s) {
1524 list_del_init(&oo->oo_close_lru);
1525 oo->oo_last_closed_stid = NULL;
1526 }
1527 spin_unlock(&nn->client_lock);
1528 if (s)
1529 nfs4_put_stid(&s->st_stid);
1530 }
1531
release_openowner(struct nfs4_openowner * oo)1532 static void release_openowner(struct nfs4_openowner *oo)
1533 {
1534 struct nfs4_ol_stateid *stp;
1535 struct nfs4_client *clp = oo->oo_owner.so_client;
1536 struct list_head reaplist;
1537
1538 INIT_LIST_HEAD(&reaplist);
1539
1540 spin_lock(&clp->cl_lock);
1541 unhash_openowner_locked(oo);
1542 while (!list_empty(&oo->oo_owner.so_stateids)) {
1543 stp = list_first_entry(&oo->oo_owner.so_stateids,
1544 struct nfs4_ol_stateid, st_perstateowner);
1545 if (unhash_open_stateid(stp, &reaplist))
1546 put_ol_stateid_locked(stp, &reaplist);
1547 }
1548 spin_unlock(&clp->cl_lock);
1549 free_ol_stateid_reaplist(&reaplist);
1550 release_last_closed_stateid(oo);
1551 nfs4_put_stateowner(&oo->oo_owner);
1552 }
1553
1554 static inline int
hash_sessionid(struct nfs4_sessionid * sessionid)1555 hash_sessionid(struct nfs4_sessionid *sessionid)
1556 {
1557 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
1558
1559 return sid->sequence % SESSION_HASH_SIZE;
1560 }
1561
1562 #ifdef CONFIG_SUNRPC_DEBUG
1563 static inline void
dump_sessionid(const char * fn,struct nfs4_sessionid * sessionid)1564 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1565 {
1566 u32 *ptr = (u32 *)(&sessionid->data[0]);
1567 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
1568 }
1569 #else
1570 static inline void
dump_sessionid(const char * fn,struct nfs4_sessionid * sessionid)1571 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1572 {
1573 }
1574 #endif
1575
1576 /*
1577 * Bump the seqid on cstate->replay_owner, and clear replay_owner if it
1578 * won't be used for replay.
1579 */
nfsd4_bump_seqid(struct nfsd4_compound_state * cstate,__be32 nfserr)1580 void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
1581 {
1582 struct nfs4_stateowner *so = cstate->replay_owner;
1583
1584 if (nfserr == nfserr_replay_me)
1585 return;
1586
1587 if (!seqid_mutating_err(ntohl(nfserr))) {
1588 nfsd4_cstate_clear_replay(cstate);
1589 return;
1590 }
1591 if (!so)
1592 return;
1593 if (so->so_is_open_owner)
1594 release_last_closed_stateid(openowner(so));
1595 so->so_seqid++;
1596 return;
1597 }
1598
1599 static void
gen_sessionid(struct nfsd4_session * ses)1600 gen_sessionid(struct nfsd4_session *ses)
1601 {
1602 struct nfs4_client *clp = ses->se_client;
1603 struct nfsd4_sessionid *sid;
1604
1605 sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
1606 sid->clientid = clp->cl_clientid;
1607 sid->sequence = current_sessionid++;
1608 sid->reserved = 0;
1609 }
1610
1611 /*
1612 * The protocol defines ca_maxresponssize_cached to include the size of
1613 * the rpc header, but all we need to cache is the data starting after
1614 * the end of the initial SEQUENCE operation--the rest we regenerate
1615 * each time. Therefore we can advertise a ca_maxresponssize_cached
1616 * value that is the number of bytes in our cache plus a few additional
1617 * bytes. In order to stay on the safe side, and not promise more than
1618 * we can cache, those additional bytes must be the minimum possible: 24
1619 * bytes of rpc header (xid through accept state, with AUTH_NULL
1620 * verifier), 12 for the compound header (with zero-length tag), and 44
1621 * for the SEQUENCE op response:
1622 */
1623 #define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
1624
1625 static void
free_session_slots(struct nfsd4_session * ses)1626 free_session_slots(struct nfsd4_session *ses)
1627 {
1628 int i;
1629
1630 for (i = 0; i < ses->se_fchannel.maxreqs; i++) {
1631 free_svc_cred(&ses->se_slots[i]->sl_cred);
1632 kfree(ses->se_slots[i]);
1633 }
1634 }
1635
1636 /*
1637 * We don't actually need to cache the rpc and session headers, so we
1638 * can allocate a little less for each slot:
1639 */
slot_bytes(struct nfsd4_channel_attrs * ca)1640 static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca)
1641 {
1642 u32 size;
1643
1644 if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ)
1645 size = 0;
1646 else
1647 size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
1648 return size + sizeof(struct nfsd4_slot);
1649 }
1650
1651 /*
1652 * XXX: If we run out of reserved DRC memory we could (up to a point)
1653 * re-negotiate active sessions and reduce their slot usage to make
1654 * room for new connections. For now we just fail the create session.
1655 */
nfsd4_get_drc_mem(struct nfsd4_channel_attrs * ca,struct nfsd_net * nn)1656 static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
1657 {
1658 u32 slotsize = slot_bytes(ca);
1659 u32 num = ca->maxreqs;
1660 unsigned long avail, total_avail;
1661 unsigned int scale_factor;
1662
1663 spin_lock(&nfsd_drc_lock);
1664 if (nfsd_drc_max_mem > nfsd_drc_mem_used)
1665 total_avail = nfsd_drc_max_mem - nfsd_drc_mem_used;
1666 else
1667 /* We have handed out more space than we chose in
1668 * set_max_drc() to allow. That isn't really a
1669 * problem as long as that doesn't make us think we
1670 * have lots more due to integer overflow.
1671 */
1672 total_avail = 0;
1673 avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION, total_avail);
1674 /*
1675 * Never use more than a fraction of the remaining memory,
1676 * unless it's the only way to give this client a slot.
1677 * The chosen fraction is either 1/8 or 1/number of threads,
1678 * whichever is smaller. This ensures there are adequate
1679 * slots to support multiple clients per thread.
1680 * Give the client one slot even if that would require
1681 * over-allocation--it is better than failure.
1682 */
1683 scale_factor = max_t(unsigned int, 8, nn->nfsd_serv->sv_nrthreads);
1684
1685 avail = clamp_t(unsigned long, avail, slotsize,
1686 total_avail/scale_factor);
1687 num = min_t(int, num, avail / slotsize);
1688 num = max_t(int, num, 1);
1689 nfsd_drc_mem_used += num * slotsize;
1690 spin_unlock(&nfsd_drc_lock);
1691
1692 return num;
1693 }
1694
nfsd4_put_drc_mem(struct nfsd4_channel_attrs * ca)1695 static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca)
1696 {
1697 int slotsize = slot_bytes(ca);
1698
1699 spin_lock(&nfsd_drc_lock);
1700 nfsd_drc_mem_used -= slotsize * ca->maxreqs;
1701 spin_unlock(&nfsd_drc_lock);
1702 }
1703
alloc_session(struct nfsd4_channel_attrs * fattrs,struct nfsd4_channel_attrs * battrs)1704 static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs,
1705 struct nfsd4_channel_attrs *battrs)
1706 {
1707 int numslots = fattrs->maxreqs;
1708 int slotsize = slot_bytes(fattrs);
1709 struct nfsd4_session *new;
1710 int mem, i;
1711
1712 BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
1713 + sizeof(struct nfsd4_session) > PAGE_SIZE);
1714 mem = numslots * sizeof(struct nfsd4_slot *);
1715
1716 new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
1717 if (!new)
1718 return NULL;
1719 /* allocate each struct nfsd4_slot and data cache in one piece */
1720 for (i = 0; i < numslots; i++) {
1721 new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL);
1722 if (!new->se_slots[i])
1723 goto out_free;
1724 }
1725
1726 memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs));
1727 memcpy(&new->se_bchannel, battrs, sizeof(struct nfsd4_channel_attrs));
1728
1729 return new;
1730 out_free:
1731 while (i--)
1732 kfree(new->se_slots[i]);
1733 kfree(new);
1734 return NULL;
1735 }
1736
free_conn(struct nfsd4_conn * c)1737 static void free_conn(struct nfsd4_conn *c)
1738 {
1739 svc_xprt_put(c->cn_xprt);
1740 kfree(c);
1741 }
1742
nfsd4_conn_lost(struct svc_xpt_user * u)1743 static void nfsd4_conn_lost(struct svc_xpt_user *u)
1744 {
1745 struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
1746 struct nfs4_client *clp = c->cn_session->se_client;
1747
1748 spin_lock(&clp->cl_lock);
1749 if (!list_empty(&c->cn_persession)) {
1750 list_del(&c->cn_persession);
1751 free_conn(c);
1752 }
1753 nfsd4_probe_callback(clp);
1754 spin_unlock(&clp->cl_lock);
1755 }
1756
alloc_conn(struct svc_rqst * rqstp,u32 flags)1757 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
1758 {
1759 struct nfsd4_conn *conn;
1760
1761 conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
1762 if (!conn)
1763 return NULL;
1764 svc_xprt_get(rqstp->rq_xprt);
1765 conn->cn_xprt = rqstp->rq_xprt;
1766 conn->cn_flags = flags;
1767 INIT_LIST_HEAD(&conn->cn_xpt_user.list);
1768 return conn;
1769 }
1770
__nfsd4_hash_conn(struct nfsd4_conn * conn,struct nfsd4_session * ses)1771 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1772 {
1773 conn->cn_session = ses;
1774 list_add(&conn->cn_persession, &ses->se_conns);
1775 }
1776
nfsd4_hash_conn(struct nfsd4_conn * conn,struct nfsd4_session * ses)1777 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1778 {
1779 struct nfs4_client *clp = ses->se_client;
1780
1781 spin_lock(&clp->cl_lock);
1782 __nfsd4_hash_conn(conn, ses);
1783 spin_unlock(&clp->cl_lock);
1784 }
1785
nfsd4_register_conn(struct nfsd4_conn * conn)1786 static int nfsd4_register_conn(struct nfsd4_conn *conn)
1787 {
1788 conn->cn_xpt_user.callback = nfsd4_conn_lost;
1789 return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
1790 }
1791
nfsd4_init_conn(struct svc_rqst * rqstp,struct nfsd4_conn * conn,struct nfsd4_session * ses)1792 static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
1793 {
1794 int ret;
1795
1796 nfsd4_hash_conn(conn, ses);
1797 ret = nfsd4_register_conn(conn);
1798 if (ret)
1799 /* oops; xprt is already down: */
1800 nfsd4_conn_lost(&conn->cn_xpt_user);
1801 /* We may have gained or lost a callback channel: */
1802 nfsd4_probe_callback_sync(ses->se_client);
1803 }
1804
alloc_conn_from_crses(struct svc_rqst * rqstp,struct nfsd4_create_session * cses)1805 static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
1806 {
1807 u32 dir = NFS4_CDFC4_FORE;
1808
1809 if (cses->flags & SESSION4_BACK_CHAN)
1810 dir |= NFS4_CDFC4_BACK;
1811 return alloc_conn(rqstp, dir);
1812 }
1813
1814 /* must be called under client_lock */
nfsd4_del_conns(struct nfsd4_session * s)1815 static void nfsd4_del_conns(struct nfsd4_session *s)
1816 {
1817 struct nfs4_client *clp = s->se_client;
1818 struct nfsd4_conn *c;
1819
1820 spin_lock(&clp->cl_lock);
1821 while (!list_empty(&s->se_conns)) {
1822 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
1823 list_del_init(&c->cn_persession);
1824 spin_unlock(&clp->cl_lock);
1825
1826 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
1827 free_conn(c);
1828
1829 spin_lock(&clp->cl_lock);
1830 }
1831 spin_unlock(&clp->cl_lock);
1832 }
1833
__free_session(struct nfsd4_session * ses)1834 static void __free_session(struct nfsd4_session *ses)
1835 {
1836 free_session_slots(ses);
1837 kfree(ses);
1838 }
1839
free_session(struct nfsd4_session * ses)1840 static void free_session(struct nfsd4_session *ses)
1841 {
1842 nfsd4_del_conns(ses);
1843 nfsd4_put_drc_mem(&ses->se_fchannel);
1844 __free_session(ses);
1845 }
1846
init_session(struct svc_rqst * rqstp,struct nfsd4_session * new,struct nfs4_client * clp,struct nfsd4_create_session * cses)1847 static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
1848 {
1849 int idx;
1850 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1851
1852 new->se_client = clp;
1853 gen_sessionid(new);
1854
1855 INIT_LIST_HEAD(&new->se_conns);
1856
1857 new->se_cb_seq_nr = 1;
1858 new->se_flags = cses->flags;
1859 new->se_cb_prog = cses->callback_prog;
1860 new->se_cb_sec = cses->cb_sec;
1861 atomic_set(&new->se_ref, 0);
1862 idx = hash_sessionid(&new->se_sessionid);
1863 list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
1864 spin_lock(&clp->cl_lock);
1865 list_add(&new->se_perclnt, &clp->cl_sessions);
1866 spin_unlock(&clp->cl_lock);
1867
1868 {
1869 struct sockaddr *sa = svc_addr(rqstp);
1870 /*
1871 * This is a little silly; with sessions there's no real
1872 * use for the callback address. Use the peer address
1873 * as a reasonable default for now, but consider fixing
1874 * the rpc client not to require an address in the
1875 * future:
1876 */
1877 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
1878 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
1879 }
1880 }
1881
1882 /* caller must hold client_lock */
1883 static struct nfsd4_session *
__find_in_sessionid_hashtbl(struct nfs4_sessionid * sessionid,struct net * net)1884 __find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
1885 {
1886 struct nfsd4_session *elem;
1887 int idx;
1888 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1889
1890 lockdep_assert_held(&nn->client_lock);
1891
1892 dump_sessionid(__func__, sessionid);
1893 idx = hash_sessionid(sessionid);
1894 /* Search in the appropriate list */
1895 list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
1896 if (!memcmp(elem->se_sessionid.data, sessionid->data,
1897 NFS4_MAX_SESSIONID_LEN)) {
1898 return elem;
1899 }
1900 }
1901
1902 dprintk("%s: session not found\n", __func__);
1903 return NULL;
1904 }
1905
1906 static struct nfsd4_session *
find_in_sessionid_hashtbl(struct nfs4_sessionid * sessionid,struct net * net,__be32 * ret)1907 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net,
1908 __be32 *ret)
1909 {
1910 struct nfsd4_session *session;
1911 __be32 status = nfserr_badsession;
1912
1913 session = __find_in_sessionid_hashtbl(sessionid, net);
1914 if (!session)
1915 goto out;
1916 status = nfsd4_get_session_locked(session);
1917 if (status)
1918 session = NULL;
1919 out:
1920 *ret = status;
1921 return session;
1922 }
1923
1924 /* caller must hold client_lock */
1925 static void
unhash_session(struct nfsd4_session * ses)1926 unhash_session(struct nfsd4_session *ses)
1927 {
1928 struct nfs4_client *clp = ses->se_client;
1929 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1930
1931 lockdep_assert_held(&nn->client_lock);
1932
1933 list_del(&ses->se_hash);
1934 spin_lock(&ses->se_client->cl_lock);
1935 list_del(&ses->se_perclnt);
1936 spin_unlock(&ses->se_client->cl_lock);
1937 }
1938
1939 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1940 static int
STALE_CLIENTID(clientid_t * clid,struct nfsd_net * nn)1941 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
1942 {
1943 /*
1944 * We're assuming the clid was not given out from a boot
1945 * precisely 2^32 (about 136 years) before this one. That seems
1946 * a safe assumption:
1947 */
1948 if (clid->cl_boot == (u32)nn->boot_time)
1949 return 0;
1950 trace_nfsd_clid_stale(clid);
1951 return 1;
1952 }
1953
1954 /*
1955 * XXX Should we use a slab cache ?
1956 * This type of memory management is somewhat inefficient, but we use it
1957 * anyway since SETCLIENTID is not a common operation.
1958 */
alloc_client(struct xdr_netobj name)1959 static struct nfs4_client *alloc_client(struct xdr_netobj name)
1960 {
1961 struct nfs4_client *clp;
1962 int i;
1963
1964 clp = kmem_cache_zalloc(client_slab, GFP_KERNEL);
1965 if (clp == NULL)
1966 return NULL;
1967 xdr_netobj_dup(&clp->cl_name, &name, GFP_KERNEL);
1968 if (clp->cl_name.data == NULL)
1969 goto err_no_name;
1970 clp->cl_ownerstr_hashtbl = kmalloc_array(OWNER_HASH_SIZE,
1971 sizeof(struct list_head),
1972 GFP_KERNEL);
1973 if (!clp->cl_ownerstr_hashtbl)
1974 goto err_no_hashtbl;
1975 for (i = 0; i < OWNER_HASH_SIZE; i++)
1976 INIT_LIST_HEAD(&clp->cl_ownerstr_hashtbl[i]);
1977 INIT_LIST_HEAD(&clp->cl_sessions);
1978 idr_init(&clp->cl_stateids);
1979 atomic_set(&clp->cl_rpc_users, 0);
1980 clp->cl_cb_state = NFSD4_CB_UNKNOWN;
1981 INIT_LIST_HEAD(&clp->cl_idhash);
1982 INIT_LIST_HEAD(&clp->cl_openowners);
1983 INIT_LIST_HEAD(&clp->cl_delegations);
1984 INIT_LIST_HEAD(&clp->cl_lru);
1985 INIT_LIST_HEAD(&clp->cl_revoked);
1986 #ifdef CONFIG_NFSD_PNFS
1987 INIT_LIST_HEAD(&clp->cl_lo_states);
1988 #endif
1989 INIT_LIST_HEAD(&clp->async_copies);
1990 spin_lock_init(&clp->async_lock);
1991 spin_lock_init(&clp->cl_lock);
1992 rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1993 return clp;
1994 err_no_hashtbl:
1995 kfree(clp->cl_name.data);
1996 err_no_name:
1997 kmem_cache_free(client_slab, clp);
1998 return NULL;
1999 }
2000
__free_client(struct kref * k)2001 static void __free_client(struct kref *k)
2002 {
2003 struct nfsdfs_client *c = container_of(k, struct nfsdfs_client, cl_ref);
2004 struct nfs4_client *clp = container_of(c, struct nfs4_client, cl_nfsdfs);
2005
2006 free_svc_cred(&clp->cl_cred);
2007 kfree(clp->cl_ownerstr_hashtbl);
2008 kfree(clp->cl_name.data);
2009 kfree(clp->cl_nii_domain.data);
2010 kfree(clp->cl_nii_name.data);
2011 idr_destroy(&clp->cl_stateids);
2012 kmem_cache_free(client_slab, clp);
2013 }
2014
drop_client(struct nfs4_client * clp)2015 static void drop_client(struct nfs4_client *clp)
2016 {
2017 kref_put(&clp->cl_nfsdfs.cl_ref, __free_client);
2018 }
2019
2020 static void
free_client(struct nfs4_client * clp)2021 free_client(struct nfs4_client *clp)
2022 {
2023 while (!list_empty(&clp->cl_sessions)) {
2024 struct nfsd4_session *ses;
2025 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
2026 se_perclnt);
2027 list_del(&ses->se_perclnt);
2028 WARN_ON_ONCE(atomic_read(&ses->se_ref));
2029 free_session(ses);
2030 }
2031 rpc_destroy_wait_queue(&clp->cl_cb_waitq);
2032 if (clp->cl_nfsd_dentry) {
2033 nfsd_client_rmdir(clp->cl_nfsd_dentry);
2034 clp->cl_nfsd_dentry = NULL;
2035 wake_up_all(&expiry_wq);
2036 }
2037 drop_client(clp);
2038 }
2039
2040 /* must be called under the client_lock */
2041 static void
unhash_client_locked(struct nfs4_client * clp)2042 unhash_client_locked(struct nfs4_client *clp)
2043 {
2044 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2045 struct nfsd4_session *ses;
2046
2047 lockdep_assert_held(&nn->client_lock);
2048
2049 /* Mark the client as expired! */
2050 clp->cl_time = 0;
2051 /* Make it invisible */
2052 if (!list_empty(&clp->cl_idhash)) {
2053 list_del_init(&clp->cl_idhash);
2054 if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
2055 rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
2056 else
2057 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
2058 }
2059 list_del_init(&clp->cl_lru);
2060 spin_lock(&clp->cl_lock);
2061 list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
2062 list_del_init(&ses->se_hash);
2063 spin_unlock(&clp->cl_lock);
2064 }
2065
2066 static void
unhash_client(struct nfs4_client * clp)2067 unhash_client(struct nfs4_client *clp)
2068 {
2069 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2070
2071 spin_lock(&nn->client_lock);
2072 unhash_client_locked(clp);
2073 spin_unlock(&nn->client_lock);
2074 }
2075
mark_client_expired_locked(struct nfs4_client * clp)2076 static __be32 mark_client_expired_locked(struct nfs4_client *clp)
2077 {
2078 if (atomic_read(&clp->cl_rpc_users))
2079 return nfserr_jukebox;
2080 unhash_client_locked(clp);
2081 return nfs_ok;
2082 }
2083
2084 static void
__destroy_client(struct nfs4_client * clp)2085 __destroy_client(struct nfs4_client *clp)
2086 {
2087 int i;
2088 struct nfs4_openowner *oo;
2089 struct nfs4_delegation *dp;
2090 struct list_head reaplist;
2091
2092 INIT_LIST_HEAD(&reaplist);
2093 spin_lock(&state_lock);
2094 while (!list_empty(&clp->cl_delegations)) {
2095 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
2096 WARN_ON(!unhash_delegation_locked(dp));
2097 list_add(&dp->dl_recall_lru, &reaplist);
2098 }
2099 spin_unlock(&state_lock);
2100 while (!list_empty(&reaplist)) {
2101 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
2102 list_del_init(&dp->dl_recall_lru);
2103 destroy_unhashed_deleg(dp);
2104 }
2105 while (!list_empty(&clp->cl_revoked)) {
2106 dp = list_entry(clp->cl_revoked.next, struct nfs4_delegation, dl_recall_lru);
2107 list_del_init(&dp->dl_recall_lru);
2108 nfs4_put_stid(&dp->dl_stid);
2109 }
2110 while (!list_empty(&clp->cl_openowners)) {
2111 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
2112 nfs4_get_stateowner(&oo->oo_owner);
2113 release_openowner(oo);
2114 }
2115 for (i = 0; i < OWNER_HASH_SIZE; i++) {
2116 struct nfs4_stateowner *so, *tmp;
2117
2118 list_for_each_entry_safe(so, tmp, &clp->cl_ownerstr_hashtbl[i],
2119 so_strhash) {
2120 /* Should be no openowners at this point */
2121 WARN_ON_ONCE(so->so_is_open_owner);
2122 remove_blocked_locks(lockowner(so));
2123 }
2124 }
2125 nfsd4_return_all_client_layouts(clp);
2126 nfsd4_shutdown_copy(clp);
2127 nfsd4_shutdown_callback(clp);
2128 if (clp->cl_cb_conn.cb_xprt)
2129 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
2130 free_client(clp);
2131 wake_up_all(&expiry_wq);
2132 }
2133
2134 static void
destroy_client(struct nfs4_client * clp)2135 destroy_client(struct nfs4_client *clp)
2136 {
2137 unhash_client(clp);
2138 __destroy_client(clp);
2139 }
2140
inc_reclaim_complete(struct nfs4_client * clp)2141 static void inc_reclaim_complete(struct nfs4_client *clp)
2142 {
2143 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2144
2145 if (!nn->track_reclaim_completes)
2146 return;
2147 if (!nfsd4_find_reclaim_client(clp->cl_name, nn))
2148 return;
2149 if (atomic_inc_return(&nn->nr_reclaim_complete) ==
2150 nn->reclaim_str_hashtbl_size) {
2151 printk(KERN_INFO "NFSD: all clients done reclaiming, ending NFSv4 grace period (net %x)\n",
2152 clp->net->ns.inum);
2153 nfsd4_end_grace(nn);
2154 }
2155 }
2156
expire_client(struct nfs4_client * clp)2157 static void expire_client(struct nfs4_client *clp)
2158 {
2159 unhash_client(clp);
2160 nfsd4_client_record_remove(clp);
2161 __destroy_client(clp);
2162 }
2163
copy_verf(struct nfs4_client * target,nfs4_verifier * source)2164 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
2165 {
2166 memcpy(target->cl_verifier.data, source->data,
2167 sizeof(target->cl_verifier.data));
2168 }
2169
copy_clid(struct nfs4_client * target,struct nfs4_client * source)2170 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
2171 {
2172 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
2173 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
2174 }
2175
copy_cred(struct svc_cred * target,struct svc_cred * source)2176 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
2177 {
2178 target->cr_principal = kstrdup(source->cr_principal, GFP_KERNEL);
2179 target->cr_raw_principal = kstrdup(source->cr_raw_principal,
2180 GFP_KERNEL);
2181 target->cr_targ_princ = kstrdup(source->cr_targ_princ, GFP_KERNEL);
2182 if ((source->cr_principal && !target->cr_principal) ||
2183 (source->cr_raw_principal && !target->cr_raw_principal) ||
2184 (source->cr_targ_princ && !target->cr_targ_princ))
2185 return -ENOMEM;
2186
2187 target->cr_flavor = source->cr_flavor;
2188 target->cr_uid = source->cr_uid;
2189 target->cr_gid = source->cr_gid;
2190 target->cr_group_info = source->cr_group_info;
2191 get_group_info(target->cr_group_info);
2192 target->cr_gss_mech = source->cr_gss_mech;
2193 if (source->cr_gss_mech)
2194 gss_mech_get(source->cr_gss_mech);
2195 return 0;
2196 }
2197
2198 static int
compare_blob(const struct xdr_netobj * o1,const struct xdr_netobj * o2)2199 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
2200 {
2201 if (o1->len < o2->len)
2202 return -1;
2203 if (o1->len > o2->len)
2204 return 1;
2205 return memcmp(o1->data, o2->data, o1->len);
2206 }
2207
2208 static int
same_verf(nfs4_verifier * v1,nfs4_verifier * v2)2209 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
2210 {
2211 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
2212 }
2213
2214 static int
same_clid(clientid_t * cl1,clientid_t * cl2)2215 same_clid(clientid_t *cl1, clientid_t *cl2)
2216 {
2217 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
2218 }
2219
groups_equal(struct group_info * g1,struct group_info * g2)2220 static bool groups_equal(struct group_info *g1, struct group_info *g2)
2221 {
2222 int i;
2223
2224 if (g1->ngroups != g2->ngroups)
2225 return false;
2226 for (i=0; i<g1->ngroups; i++)
2227 if (!gid_eq(g1->gid[i], g2->gid[i]))
2228 return false;
2229 return true;
2230 }
2231
2232 /*
2233 * RFC 3530 language requires clid_inuse be returned when the
2234 * "principal" associated with a requests differs from that previously
2235 * used. We use uid, gid's, and gss principal string as our best
2236 * approximation. We also don't want to allow non-gss use of a client
2237 * established using gss: in theory cr_principal should catch that
2238 * change, but in practice cr_principal can be null even in the gss case
2239 * since gssd doesn't always pass down a principal string.
2240 */
is_gss_cred(struct svc_cred * cr)2241 static bool is_gss_cred(struct svc_cred *cr)
2242 {
2243 /* Is cr_flavor one of the gss "pseudoflavors"?: */
2244 return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
2245 }
2246
2247
2248 static bool
same_creds(struct svc_cred * cr1,struct svc_cred * cr2)2249 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
2250 {
2251 if ((is_gss_cred(cr1) != is_gss_cred(cr2))
2252 || (!uid_eq(cr1->cr_uid, cr2->cr_uid))
2253 || (!gid_eq(cr1->cr_gid, cr2->cr_gid))
2254 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
2255 return false;
2256 /* XXX: check that cr_targ_princ fields match ? */
2257 if (cr1->cr_principal == cr2->cr_principal)
2258 return true;
2259 if (!cr1->cr_principal || !cr2->cr_principal)
2260 return false;
2261 return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
2262 }
2263
svc_rqst_integrity_protected(struct svc_rqst * rqstp)2264 static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
2265 {
2266 struct svc_cred *cr = &rqstp->rq_cred;
2267 u32 service;
2268
2269 if (!cr->cr_gss_mech)
2270 return false;
2271 service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
2272 return service == RPC_GSS_SVC_INTEGRITY ||
2273 service == RPC_GSS_SVC_PRIVACY;
2274 }
2275
nfsd4_mach_creds_match(struct nfs4_client * cl,struct svc_rqst * rqstp)2276 bool nfsd4_mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
2277 {
2278 struct svc_cred *cr = &rqstp->rq_cred;
2279
2280 if (!cl->cl_mach_cred)
2281 return true;
2282 if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
2283 return false;
2284 if (!svc_rqst_integrity_protected(rqstp))
2285 return false;
2286 if (cl->cl_cred.cr_raw_principal)
2287 return 0 == strcmp(cl->cl_cred.cr_raw_principal,
2288 cr->cr_raw_principal);
2289 if (!cr->cr_principal)
2290 return false;
2291 return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
2292 }
2293
gen_confirm(struct nfs4_client * clp,struct nfsd_net * nn)2294 static void gen_confirm(struct nfs4_client *clp, struct nfsd_net *nn)
2295 {
2296 __be32 verf[2];
2297
2298 /*
2299 * This is opaque to client, so no need to byte-swap. Use
2300 * __force to keep sparse happy
2301 */
2302 verf[0] = (__force __be32)(u32)ktime_get_real_seconds();
2303 verf[1] = (__force __be32)nn->clverifier_counter++;
2304 memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
2305 }
2306
gen_clid(struct nfs4_client * clp,struct nfsd_net * nn)2307 static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
2308 {
2309 clp->cl_clientid.cl_boot = (u32)nn->boot_time;
2310 clp->cl_clientid.cl_id = nn->clientid_counter++;
2311 gen_confirm(clp, nn);
2312 }
2313
2314 static struct nfs4_stid *
find_stateid_locked(struct nfs4_client * cl,stateid_t * t)2315 find_stateid_locked(struct nfs4_client *cl, stateid_t *t)
2316 {
2317 struct nfs4_stid *ret;
2318
2319 ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
2320 if (!ret || !ret->sc_type)
2321 return NULL;
2322 return ret;
2323 }
2324
2325 static struct nfs4_stid *
find_stateid_by_type(struct nfs4_client * cl,stateid_t * t,char typemask)2326 find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
2327 {
2328 struct nfs4_stid *s;
2329
2330 spin_lock(&cl->cl_lock);
2331 s = find_stateid_locked(cl, t);
2332 if (s != NULL) {
2333 if (typemask & s->sc_type)
2334 refcount_inc(&s->sc_count);
2335 else
2336 s = NULL;
2337 }
2338 spin_unlock(&cl->cl_lock);
2339 return s;
2340 }
2341
get_nfsdfs_clp(struct inode * inode)2342 static struct nfs4_client *get_nfsdfs_clp(struct inode *inode)
2343 {
2344 struct nfsdfs_client *nc;
2345 nc = get_nfsdfs_client(inode);
2346 if (!nc)
2347 return NULL;
2348 return container_of(nc, struct nfs4_client, cl_nfsdfs);
2349 }
2350
seq_quote_mem(struct seq_file * m,char * data,int len)2351 static void seq_quote_mem(struct seq_file *m, char *data, int len)
2352 {
2353 seq_printf(m, "\"");
2354 seq_escape_mem_ascii(m, data, len);
2355 seq_printf(m, "\"");
2356 }
2357
client_info_show(struct seq_file * m,void * v)2358 static int client_info_show(struct seq_file *m, void *v)
2359 {
2360 struct inode *inode = m->private;
2361 struct nfs4_client *clp;
2362 u64 clid;
2363
2364 clp = get_nfsdfs_clp(inode);
2365 if (!clp)
2366 return -ENXIO;
2367 memcpy(&clid, &clp->cl_clientid, sizeof(clid));
2368 seq_printf(m, "clientid: 0x%llx\n", clid);
2369 seq_printf(m, "address: \"%pISpc\"\n", (struct sockaddr *)&clp->cl_addr);
2370 if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
2371 seq_puts(m, "status: confirmed\n");
2372 else
2373 seq_puts(m, "status: unconfirmed\n");
2374 seq_printf(m, "name: ");
2375 seq_quote_mem(m, clp->cl_name.data, clp->cl_name.len);
2376 seq_printf(m, "\nminor version: %d\n", clp->cl_minorversion);
2377 if (clp->cl_nii_domain.data) {
2378 seq_printf(m, "Implementation domain: ");
2379 seq_quote_mem(m, clp->cl_nii_domain.data,
2380 clp->cl_nii_domain.len);
2381 seq_printf(m, "\nImplementation name: ");
2382 seq_quote_mem(m, clp->cl_nii_name.data, clp->cl_nii_name.len);
2383 seq_printf(m, "\nImplementation time: [%lld, %ld]\n",
2384 clp->cl_nii_time.tv_sec, clp->cl_nii_time.tv_nsec);
2385 }
2386 drop_client(clp);
2387
2388 return 0;
2389 }
2390
client_info_open(struct inode * inode,struct file * file)2391 static int client_info_open(struct inode *inode, struct file *file)
2392 {
2393 return single_open(file, client_info_show, inode);
2394 }
2395
2396 static const struct file_operations client_info_fops = {
2397 .open = client_info_open,
2398 .read = seq_read,
2399 .llseek = seq_lseek,
2400 .release = single_release,
2401 };
2402
states_start(struct seq_file * s,loff_t * pos)2403 static void *states_start(struct seq_file *s, loff_t *pos)
2404 __acquires(&clp->cl_lock)
2405 {
2406 struct nfs4_client *clp = s->private;
2407 unsigned long id = *pos;
2408 void *ret;
2409
2410 spin_lock(&clp->cl_lock);
2411 ret = idr_get_next_ul(&clp->cl_stateids, &id);
2412 *pos = id;
2413 return ret;
2414 }
2415
states_next(struct seq_file * s,void * v,loff_t * pos)2416 static void *states_next(struct seq_file *s, void *v, loff_t *pos)
2417 {
2418 struct nfs4_client *clp = s->private;
2419 unsigned long id = *pos;
2420 void *ret;
2421
2422 id = *pos;
2423 id++;
2424 ret = idr_get_next_ul(&clp->cl_stateids, &id);
2425 *pos = id;
2426 return ret;
2427 }
2428
states_stop(struct seq_file * s,void * v)2429 static void states_stop(struct seq_file *s, void *v)
2430 __releases(&clp->cl_lock)
2431 {
2432 struct nfs4_client *clp = s->private;
2433
2434 spin_unlock(&clp->cl_lock);
2435 }
2436
nfs4_show_fname(struct seq_file * s,struct nfsd_file * f)2437 static void nfs4_show_fname(struct seq_file *s, struct nfsd_file *f)
2438 {
2439 seq_printf(s, "filename: \"%pD2\"", f->nf_file);
2440 }
2441
nfs4_show_superblock(struct seq_file * s,struct nfsd_file * f)2442 static void nfs4_show_superblock(struct seq_file *s, struct nfsd_file *f)
2443 {
2444 struct inode *inode = f->nf_inode;
2445
2446 seq_printf(s, "superblock: \"%02x:%02x:%ld\"",
2447 MAJOR(inode->i_sb->s_dev),
2448 MINOR(inode->i_sb->s_dev),
2449 inode->i_ino);
2450 }
2451
nfs4_show_owner(struct seq_file * s,struct nfs4_stateowner * oo)2452 static void nfs4_show_owner(struct seq_file *s, struct nfs4_stateowner *oo)
2453 {
2454 seq_printf(s, "owner: ");
2455 seq_quote_mem(s, oo->so_owner.data, oo->so_owner.len);
2456 }
2457
nfs4_show_stateid(struct seq_file * s,stateid_t * stid)2458 static void nfs4_show_stateid(struct seq_file *s, stateid_t *stid)
2459 {
2460 seq_printf(s, "0x%.8x", stid->si_generation);
2461 seq_printf(s, "%12phN", &stid->si_opaque);
2462 }
2463
nfs4_show_open(struct seq_file * s,struct nfs4_stid * st)2464 static int nfs4_show_open(struct seq_file *s, struct nfs4_stid *st)
2465 {
2466 struct nfs4_ol_stateid *ols;
2467 struct nfs4_file *nf;
2468 struct nfsd_file *file;
2469 struct nfs4_stateowner *oo;
2470 unsigned int access, deny;
2471
2472 if (st->sc_type != NFS4_OPEN_STID && st->sc_type != NFS4_LOCK_STID)
2473 return 0; /* XXX: or SEQ_SKIP? */
2474 ols = openlockstateid(st);
2475 oo = ols->st_stateowner;
2476 nf = st->sc_file;
2477 file = find_any_file(nf);
2478 if (!file)
2479 return 0;
2480
2481 seq_printf(s, "- ");
2482 nfs4_show_stateid(s, &st->sc_stateid);
2483 seq_printf(s, ": { type: open, ");
2484
2485 access = bmap_to_share_mode(ols->st_access_bmap);
2486 deny = bmap_to_share_mode(ols->st_deny_bmap);
2487
2488 seq_printf(s, "access: %s%s, ",
2489 access & NFS4_SHARE_ACCESS_READ ? "r" : "-",
2490 access & NFS4_SHARE_ACCESS_WRITE ? "w" : "-");
2491 seq_printf(s, "deny: %s%s, ",
2492 deny & NFS4_SHARE_ACCESS_READ ? "r" : "-",
2493 deny & NFS4_SHARE_ACCESS_WRITE ? "w" : "-");
2494
2495 nfs4_show_superblock(s, file);
2496 seq_printf(s, ", ");
2497 nfs4_show_fname(s, file);
2498 seq_printf(s, ", ");
2499 nfs4_show_owner(s, oo);
2500 seq_printf(s, " }\n");
2501 nfsd_file_put(file);
2502
2503 return 0;
2504 }
2505
nfs4_show_lock(struct seq_file * s,struct nfs4_stid * st)2506 static int nfs4_show_lock(struct seq_file *s, struct nfs4_stid *st)
2507 {
2508 struct nfs4_ol_stateid *ols;
2509 struct nfs4_file *nf;
2510 struct nfsd_file *file;
2511 struct nfs4_stateowner *oo;
2512
2513 ols = openlockstateid(st);
2514 oo = ols->st_stateowner;
2515 nf = st->sc_file;
2516 file = find_any_file(nf);
2517 if (!file)
2518 return 0;
2519
2520 seq_printf(s, "- ");
2521 nfs4_show_stateid(s, &st->sc_stateid);
2522 seq_printf(s, ": { type: lock, ");
2523
2524 /*
2525 * Note: a lock stateid isn't really the same thing as a lock,
2526 * it's the locking state held by one owner on a file, and there
2527 * may be multiple (or no) lock ranges associated with it.
2528 * (Same for the matter is true of open stateids.)
2529 */
2530
2531 nfs4_show_superblock(s, file);
2532 /* XXX: open stateid? */
2533 seq_printf(s, ", ");
2534 nfs4_show_fname(s, file);
2535 seq_printf(s, ", ");
2536 nfs4_show_owner(s, oo);
2537 seq_printf(s, " }\n");
2538 nfsd_file_put(file);
2539
2540 return 0;
2541 }
2542
nfs4_show_deleg(struct seq_file * s,struct nfs4_stid * st)2543 static int nfs4_show_deleg(struct seq_file *s, struct nfs4_stid *st)
2544 {
2545 struct nfs4_delegation *ds;
2546 struct nfs4_file *nf;
2547 struct nfsd_file *file;
2548
2549 ds = delegstateid(st);
2550 nf = st->sc_file;
2551 file = find_deleg_file(nf);
2552 if (!file)
2553 return 0;
2554
2555 seq_printf(s, "- ");
2556 nfs4_show_stateid(s, &st->sc_stateid);
2557 seq_printf(s, ": { type: deleg, ");
2558
2559 /* Kinda dead code as long as we only support read delegs: */
2560 seq_printf(s, "access: %s, ",
2561 ds->dl_type == NFS4_OPEN_DELEGATE_READ ? "r" : "w");
2562
2563 /* XXX: lease time, whether it's being recalled. */
2564
2565 nfs4_show_superblock(s, file);
2566 seq_printf(s, ", ");
2567 nfs4_show_fname(s, file);
2568 seq_printf(s, " }\n");
2569 nfsd_file_put(file);
2570
2571 return 0;
2572 }
2573
nfs4_show_layout(struct seq_file * s,struct nfs4_stid * st)2574 static int nfs4_show_layout(struct seq_file *s, struct nfs4_stid *st)
2575 {
2576 struct nfs4_layout_stateid *ls;
2577 struct nfsd_file *file;
2578
2579 ls = container_of(st, struct nfs4_layout_stateid, ls_stid);
2580 file = ls->ls_file;
2581
2582 seq_printf(s, "- ");
2583 nfs4_show_stateid(s, &st->sc_stateid);
2584 seq_printf(s, ": { type: layout, ");
2585
2586 /* XXX: What else would be useful? */
2587
2588 nfs4_show_superblock(s, file);
2589 seq_printf(s, ", ");
2590 nfs4_show_fname(s, file);
2591 seq_printf(s, " }\n");
2592
2593 return 0;
2594 }
2595
states_show(struct seq_file * s,void * v)2596 static int states_show(struct seq_file *s, void *v)
2597 {
2598 struct nfs4_stid *st = v;
2599
2600 switch (st->sc_type) {
2601 case NFS4_OPEN_STID:
2602 return nfs4_show_open(s, st);
2603 case NFS4_LOCK_STID:
2604 return nfs4_show_lock(s, st);
2605 case NFS4_DELEG_STID:
2606 return nfs4_show_deleg(s, st);
2607 case NFS4_LAYOUT_STID:
2608 return nfs4_show_layout(s, st);
2609 default:
2610 return 0; /* XXX: or SEQ_SKIP? */
2611 }
2612 /* XXX: copy stateids? */
2613 }
2614
2615 static struct seq_operations states_seq_ops = {
2616 .start = states_start,
2617 .next = states_next,
2618 .stop = states_stop,
2619 .show = states_show
2620 };
2621
client_states_open(struct inode * inode,struct file * file)2622 static int client_states_open(struct inode *inode, struct file *file)
2623 {
2624 struct seq_file *s;
2625 struct nfs4_client *clp;
2626 int ret;
2627
2628 clp = get_nfsdfs_clp(inode);
2629 if (!clp)
2630 return -ENXIO;
2631
2632 ret = seq_open(file, &states_seq_ops);
2633 if (ret)
2634 return ret;
2635 s = file->private_data;
2636 s->private = clp;
2637 return 0;
2638 }
2639
client_opens_release(struct inode * inode,struct file * file)2640 static int client_opens_release(struct inode *inode, struct file *file)
2641 {
2642 struct seq_file *m = file->private_data;
2643 struct nfs4_client *clp = m->private;
2644
2645 /* XXX: alternatively, we could get/drop in seq start/stop */
2646 drop_client(clp);
2647 return 0;
2648 }
2649
2650 static const struct file_operations client_states_fops = {
2651 .open = client_states_open,
2652 .read = seq_read,
2653 .llseek = seq_lseek,
2654 .release = client_opens_release,
2655 };
2656
2657 /*
2658 * Normally we refuse to destroy clients that are in use, but here the
2659 * administrator is telling us to just do it. We also want to wait
2660 * so the caller has a guarantee that the client's locks are gone by
2661 * the time the write returns:
2662 */
force_expire_client(struct nfs4_client * clp)2663 static void force_expire_client(struct nfs4_client *clp)
2664 {
2665 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2666 bool already_expired;
2667
2668 spin_lock(&clp->cl_lock);
2669 clp->cl_time = 0;
2670 spin_unlock(&clp->cl_lock);
2671
2672 wait_event(expiry_wq, atomic_read(&clp->cl_rpc_users) == 0);
2673 spin_lock(&nn->client_lock);
2674 already_expired = list_empty(&clp->cl_lru);
2675 if (!already_expired)
2676 unhash_client_locked(clp);
2677 spin_unlock(&nn->client_lock);
2678
2679 if (!already_expired)
2680 expire_client(clp);
2681 else
2682 wait_event(expiry_wq, clp->cl_nfsd_dentry == NULL);
2683 }
2684
client_ctl_write(struct file * file,const char __user * buf,size_t size,loff_t * pos)2685 static ssize_t client_ctl_write(struct file *file, const char __user *buf,
2686 size_t size, loff_t *pos)
2687 {
2688 char *data;
2689 struct nfs4_client *clp;
2690
2691 data = simple_transaction_get(file, buf, size);
2692 if (IS_ERR(data))
2693 return PTR_ERR(data);
2694 if (size != 7 || 0 != memcmp(data, "expire\n", 7))
2695 return -EINVAL;
2696 clp = get_nfsdfs_clp(file_inode(file));
2697 if (!clp)
2698 return -ENXIO;
2699 force_expire_client(clp);
2700 drop_client(clp);
2701 return 7;
2702 }
2703
2704 static const struct file_operations client_ctl_fops = {
2705 .write = client_ctl_write,
2706 .release = simple_transaction_release,
2707 };
2708
2709 static const struct tree_descr client_files[] = {
2710 [0] = {"info", &client_info_fops, S_IRUSR},
2711 [1] = {"states", &client_states_fops, S_IRUSR},
2712 [2] = {"ctl", &client_ctl_fops, S_IWUSR},
2713 [3] = {""},
2714 };
2715
create_client(struct xdr_netobj name,struct svc_rqst * rqstp,nfs4_verifier * verf)2716 static struct nfs4_client *create_client(struct xdr_netobj name,
2717 struct svc_rqst *rqstp, nfs4_verifier *verf)
2718 {
2719 struct nfs4_client *clp;
2720 struct sockaddr *sa = svc_addr(rqstp);
2721 int ret;
2722 struct net *net = SVC_NET(rqstp);
2723 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2724 struct dentry *dentries[ARRAY_SIZE(client_files)];
2725
2726 clp = alloc_client(name);
2727 if (clp == NULL)
2728 return NULL;
2729
2730 ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
2731 if (ret) {
2732 free_client(clp);
2733 return NULL;
2734 }
2735 gen_clid(clp, nn);
2736 kref_init(&clp->cl_nfsdfs.cl_ref);
2737 nfsd4_init_cb(&clp->cl_cb_null, clp, NULL, NFSPROC4_CLNT_CB_NULL);
2738 clp->cl_time = ktime_get_boottime_seconds();
2739 clear_bit(0, &clp->cl_cb_slot_busy);
2740 copy_verf(clp, verf);
2741 memcpy(&clp->cl_addr, sa, sizeof(struct sockaddr_storage));
2742 clp->cl_cb_session = NULL;
2743 clp->net = net;
2744 clp->cl_nfsd_dentry = nfsd_client_mkdir(
2745 nn, &clp->cl_nfsdfs,
2746 clp->cl_clientid.cl_id - nn->clientid_base,
2747 client_files, dentries);
2748 clp->cl_nfsd_info_dentry = dentries[0];
2749 if (!clp->cl_nfsd_dentry) {
2750 free_client(clp);
2751 return NULL;
2752 }
2753 return clp;
2754 }
2755
2756 static void
add_clp_to_name_tree(struct nfs4_client * new_clp,struct rb_root * root)2757 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
2758 {
2759 struct rb_node **new = &(root->rb_node), *parent = NULL;
2760 struct nfs4_client *clp;
2761
2762 while (*new) {
2763 clp = rb_entry(*new, struct nfs4_client, cl_namenode);
2764 parent = *new;
2765
2766 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
2767 new = &((*new)->rb_left);
2768 else
2769 new = &((*new)->rb_right);
2770 }
2771
2772 rb_link_node(&new_clp->cl_namenode, parent, new);
2773 rb_insert_color(&new_clp->cl_namenode, root);
2774 }
2775
2776 static struct nfs4_client *
find_clp_in_name_tree(struct xdr_netobj * name,struct rb_root * root)2777 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
2778 {
2779 int cmp;
2780 struct rb_node *node = root->rb_node;
2781 struct nfs4_client *clp;
2782
2783 while (node) {
2784 clp = rb_entry(node, struct nfs4_client, cl_namenode);
2785 cmp = compare_blob(&clp->cl_name, name);
2786 if (cmp > 0)
2787 node = node->rb_left;
2788 else if (cmp < 0)
2789 node = node->rb_right;
2790 else
2791 return clp;
2792 }
2793 return NULL;
2794 }
2795
2796 static void
add_to_unconfirmed(struct nfs4_client * clp)2797 add_to_unconfirmed(struct nfs4_client *clp)
2798 {
2799 unsigned int idhashval;
2800 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2801
2802 lockdep_assert_held(&nn->client_lock);
2803
2804 clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
2805 add_clp_to_name_tree(clp, &nn->unconf_name_tree);
2806 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
2807 list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
2808 renew_client_locked(clp);
2809 }
2810
2811 static void
move_to_confirmed(struct nfs4_client * clp)2812 move_to_confirmed(struct nfs4_client *clp)
2813 {
2814 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
2815 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2816
2817 lockdep_assert_held(&nn->client_lock);
2818
2819 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
2820 list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
2821 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
2822 add_clp_to_name_tree(clp, &nn->conf_name_tree);
2823 if (!test_and_set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags) &&
2824 clp->cl_nfsd_dentry &&
2825 clp->cl_nfsd_info_dentry)
2826 fsnotify_dentry(clp->cl_nfsd_info_dentry, FS_MODIFY);
2827 renew_client_locked(clp);
2828 }
2829
2830 static struct nfs4_client *
find_client_in_id_table(struct list_head * tbl,clientid_t * clid,bool sessions)2831 find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
2832 {
2833 struct nfs4_client *clp;
2834 unsigned int idhashval = clientid_hashval(clid->cl_id);
2835
2836 list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
2837 if (same_clid(&clp->cl_clientid, clid)) {
2838 if ((bool)clp->cl_minorversion != sessions)
2839 return NULL;
2840 renew_client_locked(clp);
2841 return clp;
2842 }
2843 }
2844 return NULL;
2845 }
2846
2847 static struct nfs4_client *
find_confirmed_client(clientid_t * clid,bool sessions,struct nfsd_net * nn)2848 find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
2849 {
2850 struct list_head *tbl = nn->conf_id_hashtbl;
2851
2852 lockdep_assert_held(&nn->client_lock);
2853 return find_client_in_id_table(tbl, clid, sessions);
2854 }
2855
2856 static struct nfs4_client *
find_unconfirmed_client(clientid_t * clid,bool sessions,struct nfsd_net * nn)2857 find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
2858 {
2859 struct list_head *tbl = nn->unconf_id_hashtbl;
2860
2861 lockdep_assert_held(&nn->client_lock);
2862 return find_client_in_id_table(tbl, clid, sessions);
2863 }
2864
clp_used_exchangeid(struct nfs4_client * clp)2865 static bool clp_used_exchangeid(struct nfs4_client *clp)
2866 {
2867 return clp->cl_exchange_flags != 0;
2868 }
2869
2870 static struct nfs4_client *
find_confirmed_client_by_name(struct xdr_netobj * name,struct nfsd_net * nn)2871 find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
2872 {
2873 lockdep_assert_held(&nn->client_lock);
2874 return find_clp_in_name_tree(name, &nn->conf_name_tree);
2875 }
2876
2877 static struct nfs4_client *
find_unconfirmed_client_by_name(struct xdr_netobj * name,struct nfsd_net * nn)2878 find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
2879 {
2880 lockdep_assert_held(&nn->client_lock);
2881 return find_clp_in_name_tree(name, &nn->unconf_name_tree);
2882 }
2883
2884 static void
gen_callback(struct nfs4_client * clp,struct nfsd4_setclientid * se,struct svc_rqst * rqstp)2885 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
2886 {
2887 struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
2888 struct sockaddr *sa = svc_addr(rqstp);
2889 u32 scopeid = rpc_get_scope_id(sa);
2890 unsigned short expected_family;
2891
2892 /* Currently, we only support tcp and tcp6 for the callback channel */
2893 if (se->se_callback_netid_len == 3 &&
2894 !memcmp(se->se_callback_netid_val, "tcp", 3))
2895 expected_family = AF_INET;
2896 else if (se->se_callback_netid_len == 4 &&
2897 !memcmp(se->se_callback_netid_val, "tcp6", 4))
2898 expected_family = AF_INET6;
2899 else
2900 goto out_err;
2901
2902 conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
2903 se->se_callback_addr_len,
2904 (struct sockaddr *)&conn->cb_addr,
2905 sizeof(conn->cb_addr));
2906
2907 if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
2908 goto out_err;
2909
2910 if (conn->cb_addr.ss_family == AF_INET6)
2911 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
2912
2913 conn->cb_prog = se->se_callback_prog;
2914 conn->cb_ident = se->se_callback_ident;
2915 memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
2916 trace_nfsd_cb_args(clp, conn);
2917 return;
2918 out_err:
2919 conn->cb_addr.ss_family = AF_UNSPEC;
2920 conn->cb_addrlen = 0;
2921 trace_nfsd_cb_nodelegs(clp);
2922 return;
2923 }
2924
2925 /*
2926 * Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
2927 */
2928 static void
nfsd4_store_cache_entry(struct nfsd4_compoundres * resp)2929 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
2930 {
2931 struct xdr_buf *buf = resp->xdr->buf;
2932 struct nfsd4_slot *slot = resp->cstate.slot;
2933 unsigned int base;
2934
2935 dprintk("--> %s slot %p\n", __func__, slot);
2936
2937 slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
2938 slot->sl_opcnt = resp->opcnt;
2939 slot->sl_status = resp->cstate.status;
2940 free_svc_cred(&slot->sl_cred);
2941 copy_cred(&slot->sl_cred, &resp->rqstp->rq_cred);
2942
2943 if (!nfsd4_cache_this(resp)) {
2944 slot->sl_flags &= ~NFSD4_SLOT_CACHED;
2945 return;
2946 }
2947 slot->sl_flags |= NFSD4_SLOT_CACHED;
2948
2949 base = resp->cstate.data_offset;
2950 slot->sl_datalen = buf->len - base;
2951 if (read_bytes_from_xdr_buf(buf, base, slot->sl_data, slot->sl_datalen))
2952 WARN(1, "%s: sessions DRC could not cache compound\n",
2953 __func__);
2954 return;
2955 }
2956
2957 /*
2958 * Encode the replay sequence operation from the slot values.
2959 * If cachethis is FALSE encode the uncached rep error on the next
2960 * operation which sets resp->p and increments resp->opcnt for
2961 * nfs4svc_encode_compoundres.
2962 *
2963 */
2964 static __be32
nfsd4_enc_sequence_replay(struct nfsd4_compoundargs * args,struct nfsd4_compoundres * resp)2965 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
2966 struct nfsd4_compoundres *resp)
2967 {
2968 struct nfsd4_op *op;
2969 struct nfsd4_slot *slot = resp->cstate.slot;
2970
2971 /* Encode the replayed sequence operation */
2972 op = &args->ops[resp->opcnt - 1];
2973 nfsd4_encode_operation(resp, op);
2974
2975 if (slot->sl_flags & NFSD4_SLOT_CACHED)
2976 return op->status;
2977 if (args->opcnt == 1) {
2978 /*
2979 * The original operation wasn't a solo sequence--we
2980 * always cache those--so this retry must not match the
2981 * original:
2982 */
2983 op->status = nfserr_seq_false_retry;
2984 } else {
2985 op = &args->ops[resp->opcnt++];
2986 op->status = nfserr_retry_uncached_rep;
2987 nfsd4_encode_operation(resp, op);
2988 }
2989 return op->status;
2990 }
2991
2992 /*
2993 * The sequence operation is not cached because we can use the slot and
2994 * session values.
2995 */
2996 static __be32
nfsd4_replay_cache_entry(struct nfsd4_compoundres * resp,struct nfsd4_sequence * seq)2997 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
2998 struct nfsd4_sequence *seq)
2999 {
3000 struct nfsd4_slot *slot = resp->cstate.slot;
3001 struct xdr_stream *xdr = resp->xdr;
3002 __be32 *p;
3003 __be32 status;
3004
3005 dprintk("--> %s slot %p\n", __func__, slot);
3006
3007 status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
3008 if (status)
3009 return status;
3010
3011 p = xdr_reserve_space(xdr, slot->sl_datalen);
3012 if (!p) {
3013 WARN_ON_ONCE(1);
3014 return nfserr_serverfault;
3015 }
3016 xdr_encode_opaque_fixed(p, slot->sl_data, slot->sl_datalen);
3017 xdr_commit_encode(xdr);
3018
3019 resp->opcnt = slot->sl_opcnt;
3020 return slot->sl_status;
3021 }
3022
3023 /*
3024 * Set the exchange_id flags returned by the server.
3025 */
3026 static void
nfsd4_set_ex_flags(struct nfs4_client * new,struct nfsd4_exchange_id * clid)3027 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
3028 {
3029 #ifdef CONFIG_NFSD_PNFS
3030 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_PNFS_MDS;
3031 #else
3032 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
3033 #endif
3034
3035 /* Referrals are supported, Migration is not. */
3036 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
3037
3038 /* set the wire flags to return to client. */
3039 clid->flags = new->cl_exchange_flags;
3040 }
3041
client_has_openowners(struct nfs4_client * clp)3042 static bool client_has_openowners(struct nfs4_client *clp)
3043 {
3044 struct nfs4_openowner *oo;
3045
3046 list_for_each_entry(oo, &clp->cl_openowners, oo_perclient) {
3047 if (!list_empty(&oo->oo_owner.so_stateids))
3048 return true;
3049 }
3050 return false;
3051 }
3052
client_has_state(struct nfs4_client * clp)3053 static bool client_has_state(struct nfs4_client *clp)
3054 {
3055 return client_has_openowners(clp)
3056 #ifdef CONFIG_NFSD_PNFS
3057 || !list_empty(&clp->cl_lo_states)
3058 #endif
3059 || !list_empty(&clp->cl_delegations)
3060 || !list_empty(&clp->cl_sessions)
3061 || !list_empty(&clp->async_copies);
3062 }
3063
copy_impl_id(struct nfs4_client * clp,struct nfsd4_exchange_id * exid)3064 static __be32 copy_impl_id(struct nfs4_client *clp,
3065 struct nfsd4_exchange_id *exid)
3066 {
3067 if (!exid->nii_domain.data)
3068 return 0;
3069 xdr_netobj_dup(&clp->cl_nii_domain, &exid->nii_domain, GFP_KERNEL);
3070 if (!clp->cl_nii_domain.data)
3071 return nfserr_jukebox;
3072 xdr_netobj_dup(&clp->cl_nii_name, &exid->nii_name, GFP_KERNEL);
3073 if (!clp->cl_nii_name.data)
3074 return nfserr_jukebox;
3075 clp->cl_nii_time = exid->nii_time;
3076 return 0;
3077 }
3078
3079 __be32
nfsd4_exchange_id(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)3080 nfsd4_exchange_id(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3081 union nfsd4_op_u *u)
3082 {
3083 struct nfsd4_exchange_id *exid = &u->exchange_id;
3084 struct nfs4_client *conf, *new;
3085 struct nfs4_client *unconf = NULL;
3086 __be32 status;
3087 char addr_str[INET6_ADDRSTRLEN];
3088 nfs4_verifier verf = exid->verifier;
3089 struct sockaddr *sa = svc_addr(rqstp);
3090 bool update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
3091 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3092
3093 rpc_ntop(sa, addr_str, sizeof(addr_str));
3094 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
3095 "ip_addr=%s flags %x, spa_how %u\n",
3096 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
3097 addr_str, exid->flags, exid->spa_how);
3098
3099 if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
3100 return nfserr_inval;
3101
3102 new = create_client(exid->clname, rqstp, &verf);
3103 if (new == NULL)
3104 return nfserr_jukebox;
3105 status = copy_impl_id(new, exid);
3106 if (status)
3107 goto out_nolock;
3108
3109 switch (exid->spa_how) {
3110 case SP4_MACH_CRED:
3111 exid->spo_must_enforce[0] = 0;
3112 exid->spo_must_enforce[1] = (
3113 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3114 1 << (OP_EXCHANGE_ID - 32) |
3115 1 << (OP_CREATE_SESSION - 32) |
3116 1 << (OP_DESTROY_SESSION - 32) |
3117 1 << (OP_DESTROY_CLIENTID - 32));
3118
3119 exid->spo_must_allow[0] &= (1 << (OP_CLOSE) |
3120 1 << (OP_OPEN_DOWNGRADE) |
3121 1 << (OP_LOCKU) |
3122 1 << (OP_DELEGRETURN));
3123
3124 exid->spo_must_allow[1] &= (
3125 1 << (OP_TEST_STATEID - 32) |
3126 1 << (OP_FREE_STATEID - 32));
3127 if (!svc_rqst_integrity_protected(rqstp)) {
3128 status = nfserr_inval;
3129 goto out_nolock;
3130 }
3131 /*
3132 * Sometimes userspace doesn't give us a principal.
3133 * Which is a bug, really. Anyway, we can't enforce
3134 * MACH_CRED in that case, better to give up now:
3135 */
3136 if (!new->cl_cred.cr_principal &&
3137 !new->cl_cred.cr_raw_principal) {
3138 status = nfserr_serverfault;
3139 goto out_nolock;
3140 }
3141 new->cl_mach_cred = true;
3142 break;
3143 case SP4_NONE:
3144 break;
3145 default: /* checked by xdr code */
3146 WARN_ON_ONCE(1);
3147 fallthrough;
3148 case SP4_SSV:
3149 status = nfserr_encr_alg_unsupp;
3150 goto out_nolock;
3151 }
3152
3153 /* Cases below refer to rfc 5661 section 18.35.4: */
3154 spin_lock(&nn->client_lock);
3155 conf = find_confirmed_client_by_name(&exid->clname, nn);
3156 if (conf) {
3157 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
3158 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
3159
3160 if (update) {
3161 if (!clp_used_exchangeid(conf)) { /* buggy client */
3162 status = nfserr_inval;
3163 goto out;
3164 }
3165 if (!nfsd4_mach_creds_match(conf, rqstp)) {
3166 status = nfserr_wrong_cred;
3167 goto out;
3168 }
3169 if (!creds_match) { /* case 9 */
3170 status = nfserr_perm;
3171 goto out;
3172 }
3173 if (!verfs_match) { /* case 8 */
3174 status = nfserr_not_same;
3175 goto out;
3176 }
3177 /* case 6 */
3178 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
3179 goto out_copy;
3180 }
3181 if (!creds_match) { /* case 3 */
3182 if (client_has_state(conf)) {
3183 status = nfserr_clid_inuse;
3184 goto out;
3185 }
3186 goto out_new;
3187 }
3188 if (verfs_match) { /* case 2 */
3189 conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
3190 goto out_copy;
3191 }
3192 /* case 5, client reboot */
3193 conf = NULL;
3194 goto out_new;
3195 }
3196
3197 if (update) { /* case 7 */
3198 status = nfserr_noent;
3199 goto out;
3200 }
3201
3202 unconf = find_unconfirmed_client_by_name(&exid->clname, nn);
3203 if (unconf) /* case 4, possible retry or client restart */
3204 unhash_client_locked(unconf);
3205
3206 /* case 1 (normal case) */
3207 out_new:
3208 if (conf) {
3209 status = mark_client_expired_locked(conf);
3210 if (status)
3211 goto out;
3212 }
3213 new->cl_minorversion = cstate->minorversion;
3214 new->cl_spo_must_allow.u.words[0] = exid->spo_must_allow[0];
3215 new->cl_spo_must_allow.u.words[1] = exid->spo_must_allow[1];
3216
3217 add_to_unconfirmed(new);
3218 swap(new, conf);
3219 out_copy:
3220 exid->clientid.cl_boot = conf->cl_clientid.cl_boot;
3221 exid->clientid.cl_id = conf->cl_clientid.cl_id;
3222
3223 exid->seqid = conf->cl_cs_slot.sl_seqid + 1;
3224 nfsd4_set_ex_flags(conf, exid);
3225
3226 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
3227 conf->cl_cs_slot.sl_seqid, conf->cl_exchange_flags);
3228 status = nfs_ok;
3229
3230 out:
3231 spin_unlock(&nn->client_lock);
3232 out_nolock:
3233 if (new)
3234 expire_client(new);
3235 if (unconf)
3236 expire_client(unconf);
3237 return status;
3238 }
3239
3240 static __be32
check_slot_seqid(u32 seqid,u32 slot_seqid,int slot_inuse)3241 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
3242 {
3243 dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
3244 slot_seqid);
3245
3246 /* The slot is in use, and no response has been sent. */
3247 if (slot_inuse) {
3248 if (seqid == slot_seqid)
3249 return nfserr_jukebox;
3250 else
3251 return nfserr_seq_misordered;
3252 }
3253 /* Note unsigned 32-bit arithmetic handles wraparound: */
3254 if (likely(seqid == slot_seqid + 1))
3255 return nfs_ok;
3256 if (seqid == slot_seqid)
3257 return nfserr_replay_cache;
3258 return nfserr_seq_misordered;
3259 }
3260
3261 /*
3262 * Cache the create session result into the create session single DRC
3263 * slot cache by saving the xdr structure. sl_seqid has been set.
3264 * Do this for solo or embedded create session operations.
3265 */
3266 static void
nfsd4_cache_create_session(struct nfsd4_create_session * cr_ses,struct nfsd4_clid_slot * slot,__be32 nfserr)3267 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
3268 struct nfsd4_clid_slot *slot, __be32 nfserr)
3269 {
3270 slot->sl_status = nfserr;
3271 memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
3272 }
3273
3274 static __be32
nfsd4_replay_create_session(struct nfsd4_create_session * cr_ses,struct nfsd4_clid_slot * slot)3275 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
3276 struct nfsd4_clid_slot *slot)
3277 {
3278 memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
3279 return slot->sl_status;
3280 }
3281
3282 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
3283 2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
3284 1 + /* MIN tag is length with zero, only length */ \
3285 3 + /* version, opcount, opcode */ \
3286 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
3287 /* seqid, slotID, slotID, cache */ \
3288 4 ) * sizeof(__be32))
3289
3290 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
3291 2 + /* verifier: AUTH_NULL, length 0 */\
3292 1 + /* status */ \
3293 1 + /* MIN tag is length with zero, only length */ \
3294 3 + /* opcount, opcode, opstatus*/ \
3295 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
3296 /* seqid, slotID, slotID, slotID, status */ \
3297 5 ) * sizeof(__be32))
3298
check_forechannel_attrs(struct nfsd4_channel_attrs * ca,struct nfsd_net * nn)3299 static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
3300 {
3301 u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
3302
3303 if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
3304 return nfserr_toosmall;
3305 if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
3306 return nfserr_toosmall;
3307 ca->headerpadsz = 0;
3308 ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
3309 ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
3310 ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
3311 ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
3312 NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
3313 ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
3314 /*
3315 * Note decreasing slot size below client's request may make it
3316 * difficult for client to function correctly, whereas
3317 * decreasing the number of slots will (just?) affect
3318 * performance. When short on memory we therefore prefer to
3319 * decrease number of slots instead of their size. Clients that
3320 * request larger slots than they need will get poor results:
3321 * Note that we always allow at least one slot, because our
3322 * accounting is soft and provides no guarantees either way.
3323 */
3324 ca->maxreqs = nfsd4_get_drc_mem(ca, nn);
3325
3326 return nfs_ok;
3327 }
3328
3329 /*
3330 * Server's NFSv4.1 backchannel support is AUTH_SYS-only for now.
3331 * These are based on similar macros in linux/sunrpc/msg_prot.h .
3332 */
3333 #define RPC_MAX_HEADER_WITH_AUTH_SYS \
3334 (RPC_CALLHDRSIZE + 2 * (2 + UNX_CALLSLACK))
3335
3336 #define RPC_MAX_REPHEADER_WITH_AUTH_SYS \
3337 (RPC_REPHDRSIZE + (2 + NUL_REPLYSLACK))
3338
3339 #define NFSD_CB_MAX_REQ_SZ ((NFS4_enc_cb_recall_sz + \
3340 RPC_MAX_HEADER_WITH_AUTH_SYS) * sizeof(__be32))
3341 #define NFSD_CB_MAX_RESP_SZ ((NFS4_dec_cb_recall_sz + \
3342 RPC_MAX_REPHEADER_WITH_AUTH_SYS) * \
3343 sizeof(__be32))
3344
check_backchannel_attrs(struct nfsd4_channel_attrs * ca)3345 static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
3346 {
3347 ca->headerpadsz = 0;
3348
3349 if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ)
3350 return nfserr_toosmall;
3351 if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ)
3352 return nfserr_toosmall;
3353 ca->maxresp_cached = 0;
3354 if (ca->maxops < 2)
3355 return nfserr_toosmall;
3356
3357 return nfs_ok;
3358 }
3359
nfsd4_check_cb_sec(struct nfsd4_cb_sec * cbs)3360 static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
3361 {
3362 switch (cbs->flavor) {
3363 case RPC_AUTH_NULL:
3364 case RPC_AUTH_UNIX:
3365 return nfs_ok;
3366 default:
3367 /*
3368 * GSS case: the spec doesn't allow us to return this
3369 * error. But it also doesn't allow us not to support
3370 * GSS.
3371 * I'd rather this fail hard than return some error the
3372 * client might think it can already handle:
3373 */
3374 return nfserr_encr_alg_unsupp;
3375 }
3376 }
3377
3378 __be32
nfsd4_create_session(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)3379 nfsd4_create_session(struct svc_rqst *rqstp,
3380 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
3381 {
3382 struct nfsd4_create_session *cr_ses = &u->create_session;
3383 struct sockaddr *sa = svc_addr(rqstp);
3384 struct nfs4_client *conf, *unconf;
3385 struct nfs4_client *old = NULL;
3386 struct nfsd4_session *new;
3387 struct nfsd4_conn *conn;
3388 struct nfsd4_clid_slot *cs_slot = NULL;
3389 __be32 status = 0;
3390 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3391
3392 if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
3393 return nfserr_inval;
3394 status = nfsd4_check_cb_sec(&cr_ses->cb_sec);
3395 if (status)
3396 return status;
3397 status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
3398 if (status)
3399 return status;
3400 status = check_backchannel_attrs(&cr_ses->back_channel);
3401 if (status)
3402 goto out_release_drc_mem;
3403 status = nfserr_jukebox;
3404 new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel);
3405 if (!new)
3406 goto out_release_drc_mem;
3407 conn = alloc_conn_from_crses(rqstp, cr_ses);
3408 if (!conn)
3409 goto out_free_session;
3410
3411 spin_lock(&nn->client_lock);
3412 unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
3413 conf = find_confirmed_client(&cr_ses->clientid, true, nn);
3414 WARN_ON_ONCE(conf && unconf);
3415
3416 if (conf) {
3417 status = nfserr_wrong_cred;
3418 if (!nfsd4_mach_creds_match(conf, rqstp))
3419 goto out_free_conn;
3420 cs_slot = &conf->cl_cs_slot;
3421 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
3422 if (status) {
3423 if (status == nfserr_replay_cache)
3424 status = nfsd4_replay_create_session(cr_ses, cs_slot);
3425 goto out_free_conn;
3426 }
3427 } else if (unconf) {
3428 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
3429 !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
3430 status = nfserr_clid_inuse;
3431 goto out_free_conn;
3432 }
3433 status = nfserr_wrong_cred;
3434 if (!nfsd4_mach_creds_match(unconf, rqstp))
3435 goto out_free_conn;
3436 cs_slot = &unconf->cl_cs_slot;
3437 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
3438 if (status) {
3439 /* an unconfirmed replay returns misordered */
3440 status = nfserr_seq_misordered;
3441 goto out_free_conn;
3442 }
3443 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
3444 if (old) {
3445 status = mark_client_expired_locked(old);
3446 if (status) {
3447 old = NULL;
3448 goto out_free_conn;
3449 }
3450 }
3451 move_to_confirmed(unconf);
3452 conf = unconf;
3453 } else {
3454 status = nfserr_stale_clientid;
3455 goto out_free_conn;
3456 }
3457 status = nfs_ok;
3458 /* Persistent sessions are not supported */
3459 cr_ses->flags &= ~SESSION4_PERSIST;
3460 /* Upshifting from TCP to RDMA is not supported */
3461 cr_ses->flags &= ~SESSION4_RDMA;
3462
3463 init_session(rqstp, new, conf, cr_ses);
3464 nfsd4_get_session_locked(new);
3465
3466 memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
3467 NFS4_MAX_SESSIONID_LEN);
3468 cs_slot->sl_seqid++;
3469 cr_ses->seqid = cs_slot->sl_seqid;
3470
3471 /* cache solo and embedded create sessions under the client_lock */
3472 nfsd4_cache_create_session(cr_ses, cs_slot, status);
3473 spin_unlock(&nn->client_lock);
3474 /* init connection and backchannel */
3475 nfsd4_init_conn(rqstp, conn, new);
3476 nfsd4_put_session(new);
3477 if (old)
3478 expire_client(old);
3479 return status;
3480 out_free_conn:
3481 spin_unlock(&nn->client_lock);
3482 free_conn(conn);
3483 if (old)
3484 expire_client(old);
3485 out_free_session:
3486 __free_session(new);
3487 out_release_drc_mem:
3488 nfsd4_put_drc_mem(&cr_ses->fore_channel);
3489 return status;
3490 }
3491
nfsd4_map_bcts_dir(u32 * dir)3492 static __be32 nfsd4_map_bcts_dir(u32 *dir)
3493 {
3494 switch (*dir) {
3495 case NFS4_CDFC4_FORE:
3496 case NFS4_CDFC4_BACK:
3497 return nfs_ok;
3498 case NFS4_CDFC4_FORE_OR_BOTH:
3499 case NFS4_CDFC4_BACK_OR_BOTH:
3500 *dir = NFS4_CDFC4_BOTH;
3501 return nfs_ok;
3502 }
3503 return nfserr_inval;
3504 }
3505
nfsd4_backchannel_ctl(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)3506 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp,
3507 struct nfsd4_compound_state *cstate,
3508 union nfsd4_op_u *u)
3509 {
3510 struct nfsd4_backchannel_ctl *bc = &u->backchannel_ctl;
3511 struct nfsd4_session *session = cstate->session;
3512 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3513 __be32 status;
3514
3515 status = nfsd4_check_cb_sec(&bc->bc_cb_sec);
3516 if (status)
3517 return status;
3518 spin_lock(&nn->client_lock);
3519 session->se_cb_prog = bc->bc_cb_program;
3520 session->se_cb_sec = bc->bc_cb_sec;
3521 spin_unlock(&nn->client_lock);
3522
3523 nfsd4_probe_callback(session->se_client);
3524
3525 return nfs_ok;
3526 }
3527
__nfsd4_find_conn(struct svc_xprt * xpt,struct nfsd4_session * s)3528 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
3529 {
3530 struct nfsd4_conn *c;
3531
3532 list_for_each_entry(c, &s->se_conns, cn_persession) {
3533 if (c->cn_xprt == xpt) {
3534 return c;
3535 }
3536 }
3537 return NULL;
3538 }
3539
nfsd4_match_existing_connection(struct svc_rqst * rqst,struct nfsd4_session * session,u32 req)3540 static __be32 nfsd4_match_existing_connection(struct svc_rqst *rqst,
3541 struct nfsd4_session *session, u32 req)
3542 {
3543 struct nfs4_client *clp = session->se_client;
3544 struct svc_xprt *xpt = rqst->rq_xprt;
3545 struct nfsd4_conn *c;
3546 __be32 status;
3547
3548 /* Following the last paragraph of RFC 5661 Section 18.34.3: */
3549 spin_lock(&clp->cl_lock);
3550 c = __nfsd4_find_conn(xpt, session);
3551 if (!c)
3552 status = nfserr_noent;
3553 else if (req == c->cn_flags)
3554 status = nfs_ok;
3555 else if (req == NFS4_CDFC4_FORE_OR_BOTH &&
3556 c->cn_flags != NFS4_CDFC4_BACK)
3557 status = nfs_ok;
3558 else if (req == NFS4_CDFC4_BACK_OR_BOTH &&
3559 c->cn_flags != NFS4_CDFC4_FORE)
3560 status = nfs_ok;
3561 else
3562 status = nfserr_inval;
3563 spin_unlock(&clp->cl_lock);
3564 return status;
3565 }
3566
nfsd4_bind_conn_to_session(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)3567 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
3568 struct nfsd4_compound_state *cstate,
3569 union nfsd4_op_u *u)
3570 {
3571 struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
3572 __be32 status;
3573 struct nfsd4_conn *conn;
3574 struct nfsd4_session *session;
3575 struct net *net = SVC_NET(rqstp);
3576 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3577
3578 if (!nfsd4_last_compound_op(rqstp))
3579 return nfserr_not_only_op;
3580 spin_lock(&nn->client_lock);
3581 session = find_in_sessionid_hashtbl(&bcts->sessionid, net, &status);
3582 spin_unlock(&nn->client_lock);
3583 if (!session)
3584 goto out_no_session;
3585 status = nfserr_wrong_cred;
3586 if (!nfsd4_mach_creds_match(session->se_client, rqstp))
3587 goto out;
3588 status = nfsd4_match_existing_connection(rqstp, session, bcts->dir);
3589 if (status == nfs_ok || status == nfserr_inval)
3590 goto out;
3591 status = nfsd4_map_bcts_dir(&bcts->dir);
3592 if (status)
3593 goto out;
3594 conn = alloc_conn(rqstp, bcts->dir);
3595 status = nfserr_jukebox;
3596 if (!conn)
3597 goto out;
3598 nfsd4_init_conn(rqstp, conn, session);
3599 status = nfs_ok;
3600 out:
3601 nfsd4_put_session(session);
3602 out_no_session:
3603 return status;
3604 }
3605
nfsd4_compound_in_session(struct nfsd4_compound_state * cstate,struct nfs4_sessionid * sid)3606 static bool nfsd4_compound_in_session(struct nfsd4_compound_state *cstate, struct nfs4_sessionid *sid)
3607 {
3608 if (!cstate->session)
3609 return false;
3610 return !memcmp(sid, &cstate->session->se_sessionid, sizeof(*sid));
3611 }
3612
3613 __be32
nfsd4_destroy_session(struct svc_rqst * r,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)3614 nfsd4_destroy_session(struct svc_rqst *r, struct nfsd4_compound_state *cstate,
3615 union nfsd4_op_u *u)
3616 {
3617 struct nfs4_sessionid *sessionid = &u->destroy_session.sessionid;
3618 struct nfsd4_session *ses;
3619 __be32 status;
3620 int ref_held_by_me = 0;
3621 struct net *net = SVC_NET(r);
3622 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3623
3624 status = nfserr_not_only_op;
3625 if (nfsd4_compound_in_session(cstate, sessionid)) {
3626 if (!nfsd4_last_compound_op(r))
3627 goto out;
3628 ref_held_by_me++;
3629 }
3630 dump_sessionid(__func__, sessionid);
3631 spin_lock(&nn->client_lock);
3632 ses = find_in_sessionid_hashtbl(sessionid, net, &status);
3633 if (!ses)
3634 goto out_client_lock;
3635 status = nfserr_wrong_cred;
3636 if (!nfsd4_mach_creds_match(ses->se_client, r))
3637 goto out_put_session;
3638 status = mark_session_dead_locked(ses, 1 + ref_held_by_me);
3639 if (status)
3640 goto out_put_session;
3641 unhash_session(ses);
3642 spin_unlock(&nn->client_lock);
3643
3644 nfsd4_probe_callback_sync(ses->se_client);
3645
3646 spin_lock(&nn->client_lock);
3647 status = nfs_ok;
3648 out_put_session:
3649 nfsd4_put_session_locked(ses);
3650 out_client_lock:
3651 spin_unlock(&nn->client_lock);
3652 out:
3653 return status;
3654 }
3655
nfsd4_sequence_check_conn(struct nfsd4_conn * new,struct nfsd4_session * ses)3656 static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
3657 {
3658 struct nfs4_client *clp = ses->se_client;
3659 struct nfsd4_conn *c;
3660 __be32 status = nfs_ok;
3661 int ret;
3662
3663 spin_lock(&clp->cl_lock);
3664 c = __nfsd4_find_conn(new->cn_xprt, ses);
3665 if (c)
3666 goto out_free;
3667 status = nfserr_conn_not_bound_to_session;
3668 if (clp->cl_mach_cred)
3669 goto out_free;
3670 __nfsd4_hash_conn(new, ses);
3671 spin_unlock(&clp->cl_lock);
3672 ret = nfsd4_register_conn(new);
3673 if (ret)
3674 /* oops; xprt is already down: */
3675 nfsd4_conn_lost(&new->cn_xpt_user);
3676 return nfs_ok;
3677 out_free:
3678 spin_unlock(&clp->cl_lock);
3679 free_conn(new);
3680 return status;
3681 }
3682
nfsd4_session_too_many_ops(struct svc_rqst * rqstp,struct nfsd4_session * session)3683 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
3684 {
3685 struct nfsd4_compoundargs *args = rqstp->rq_argp;
3686
3687 return args->opcnt > session->se_fchannel.maxops;
3688 }
3689
nfsd4_request_too_big(struct svc_rqst * rqstp,struct nfsd4_session * session)3690 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
3691 struct nfsd4_session *session)
3692 {
3693 struct xdr_buf *xb = &rqstp->rq_arg;
3694
3695 return xb->len > session->se_fchannel.maxreq_sz;
3696 }
3697
replay_matches_cache(struct svc_rqst * rqstp,struct nfsd4_sequence * seq,struct nfsd4_slot * slot)3698 static bool replay_matches_cache(struct svc_rqst *rqstp,
3699 struct nfsd4_sequence *seq, struct nfsd4_slot *slot)
3700 {
3701 struct nfsd4_compoundargs *argp = rqstp->rq_argp;
3702
3703 if ((bool)(slot->sl_flags & NFSD4_SLOT_CACHETHIS) !=
3704 (bool)seq->cachethis)
3705 return false;
3706 /*
3707 * If there's an error then the reply can have fewer ops than
3708 * the call.
3709 */
3710 if (slot->sl_opcnt < argp->opcnt && !slot->sl_status)
3711 return false;
3712 /*
3713 * But if we cached a reply with *more* ops than the call you're
3714 * sending us now, then this new call is clearly not really a
3715 * replay of the old one:
3716 */
3717 if (slot->sl_opcnt > argp->opcnt)
3718 return false;
3719 /* This is the only check explicitly called by spec: */
3720 if (!same_creds(&rqstp->rq_cred, &slot->sl_cred))
3721 return false;
3722 /*
3723 * There may be more comparisons we could actually do, but the
3724 * spec doesn't require us to catch every case where the calls
3725 * don't match (that would require caching the call as well as
3726 * the reply), so we don't bother.
3727 */
3728 return true;
3729 }
3730
3731 __be32
nfsd4_sequence(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)3732 nfsd4_sequence(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3733 union nfsd4_op_u *u)
3734 {
3735 struct nfsd4_sequence *seq = &u->sequence;
3736 struct nfsd4_compoundres *resp = rqstp->rq_resp;
3737 struct xdr_stream *xdr = resp->xdr;
3738 struct nfsd4_session *session;
3739 struct nfs4_client *clp;
3740 struct nfsd4_slot *slot;
3741 struct nfsd4_conn *conn;
3742 __be32 status;
3743 int buflen;
3744 struct net *net = SVC_NET(rqstp);
3745 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3746
3747 if (resp->opcnt != 1)
3748 return nfserr_sequence_pos;
3749
3750 /*
3751 * Will be either used or freed by nfsd4_sequence_check_conn
3752 * below.
3753 */
3754 conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
3755 if (!conn)
3756 return nfserr_jukebox;
3757
3758 spin_lock(&nn->client_lock);
3759 session = find_in_sessionid_hashtbl(&seq->sessionid, net, &status);
3760 if (!session)
3761 goto out_no_session;
3762 clp = session->se_client;
3763
3764 status = nfserr_too_many_ops;
3765 if (nfsd4_session_too_many_ops(rqstp, session))
3766 goto out_put_session;
3767
3768 status = nfserr_req_too_big;
3769 if (nfsd4_request_too_big(rqstp, session))
3770 goto out_put_session;
3771
3772 status = nfserr_badslot;
3773 if (seq->slotid >= session->se_fchannel.maxreqs)
3774 goto out_put_session;
3775
3776 slot = session->se_slots[seq->slotid];
3777 dprintk("%s: slotid %d\n", __func__, seq->slotid);
3778
3779 /* We do not negotiate the number of slots yet, so set the
3780 * maxslots to the session maxreqs which is used to encode
3781 * sr_highest_slotid and the sr_target_slot id to maxslots */
3782 seq->maxslots = session->se_fchannel.maxreqs;
3783
3784 status = check_slot_seqid(seq->seqid, slot->sl_seqid,
3785 slot->sl_flags & NFSD4_SLOT_INUSE);
3786 if (status == nfserr_replay_cache) {
3787 status = nfserr_seq_misordered;
3788 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
3789 goto out_put_session;
3790 status = nfserr_seq_false_retry;
3791 if (!replay_matches_cache(rqstp, seq, slot))
3792 goto out_put_session;
3793 cstate->slot = slot;
3794 cstate->session = session;
3795 cstate->clp = clp;
3796 /* Return the cached reply status and set cstate->status
3797 * for nfsd4_proc_compound processing */
3798 status = nfsd4_replay_cache_entry(resp, seq);
3799 cstate->status = nfserr_replay_cache;
3800 goto out;
3801 }
3802 if (status)
3803 goto out_put_session;
3804
3805 status = nfsd4_sequence_check_conn(conn, session);
3806 conn = NULL;
3807 if (status)
3808 goto out_put_session;
3809
3810 buflen = (seq->cachethis) ?
3811 session->se_fchannel.maxresp_cached :
3812 session->se_fchannel.maxresp_sz;
3813 status = (seq->cachethis) ? nfserr_rep_too_big_to_cache :
3814 nfserr_rep_too_big;
3815 if (xdr_restrict_buflen(xdr, buflen - rqstp->rq_auth_slack))
3816 goto out_put_session;
3817 svc_reserve(rqstp, buflen);
3818
3819 status = nfs_ok;
3820 /* Success! bump slot seqid */
3821 slot->sl_seqid = seq->seqid;
3822 slot->sl_flags |= NFSD4_SLOT_INUSE;
3823 if (seq->cachethis)
3824 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
3825 else
3826 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
3827
3828 cstate->slot = slot;
3829 cstate->session = session;
3830 cstate->clp = clp;
3831
3832 out:
3833 switch (clp->cl_cb_state) {
3834 case NFSD4_CB_DOWN:
3835 seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
3836 break;
3837 case NFSD4_CB_FAULT:
3838 seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
3839 break;
3840 default:
3841 seq->status_flags = 0;
3842 }
3843 if (!list_empty(&clp->cl_revoked))
3844 seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
3845 out_no_session:
3846 if (conn)
3847 free_conn(conn);
3848 spin_unlock(&nn->client_lock);
3849 return status;
3850 out_put_session:
3851 nfsd4_put_session_locked(session);
3852 goto out_no_session;
3853 }
3854
3855 void
nfsd4_sequence_done(struct nfsd4_compoundres * resp)3856 nfsd4_sequence_done(struct nfsd4_compoundres *resp)
3857 {
3858 struct nfsd4_compound_state *cs = &resp->cstate;
3859
3860 if (nfsd4_has_session(cs)) {
3861 if (cs->status != nfserr_replay_cache) {
3862 nfsd4_store_cache_entry(resp);
3863 cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3864 }
3865 /* Drop session reference that was taken in nfsd4_sequence() */
3866 nfsd4_put_session(cs->session);
3867 } else if (cs->clp)
3868 put_client_renew(cs->clp);
3869 }
3870
3871 __be32
nfsd4_destroy_clientid(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)3872 nfsd4_destroy_clientid(struct svc_rqst *rqstp,
3873 struct nfsd4_compound_state *cstate,
3874 union nfsd4_op_u *u)
3875 {
3876 struct nfsd4_destroy_clientid *dc = &u->destroy_clientid;
3877 struct nfs4_client *conf, *unconf;
3878 struct nfs4_client *clp = NULL;
3879 __be32 status = 0;
3880 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3881
3882 spin_lock(&nn->client_lock);
3883 unconf = find_unconfirmed_client(&dc->clientid, true, nn);
3884 conf = find_confirmed_client(&dc->clientid, true, nn);
3885 WARN_ON_ONCE(conf && unconf);
3886
3887 if (conf) {
3888 if (client_has_state(conf)) {
3889 status = nfserr_clientid_busy;
3890 goto out;
3891 }
3892 status = mark_client_expired_locked(conf);
3893 if (status)
3894 goto out;
3895 clp = conf;
3896 } else if (unconf)
3897 clp = unconf;
3898 else {
3899 status = nfserr_stale_clientid;
3900 goto out;
3901 }
3902 if (!nfsd4_mach_creds_match(clp, rqstp)) {
3903 clp = NULL;
3904 status = nfserr_wrong_cred;
3905 goto out;
3906 }
3907 unhash_client_locked(clp);
3908 out:
3909 spin_unlock(&nn->client_lock);
3910 if (clp)
3911 expire_client(clp);
3912 return status;
3913 }
3914
3915 __be32
nfsd4_reclaim_complete(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)3916 nfsd4_reclaim_complete(struct svc_rqst *rqstp,
3917 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
3918 {
3919 struct nfsd4_reclaim_complete *rc = &u->reclaim_complete;
3920 struct nfs4_client *clp = cstate->clp;
3921 __be32 status = 0;
3922
3923 if (rc->rca_one_fs) {
3924 if (!cstate->current_fh.fh_dentry)
3925 return nfserr_nofilehandle;
3926 /*
3927 * We don't take advantage of the rca_one_fs case.
3928 * That's OK, it's optional, we can safely ignore it.
3929 */
3930 return nfs_ok;
3931 }
3932
3933 status = nfserr_complete_already;
3934 if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &clp->cl_flags))
3935 goto out;
3936
3937 status = nfserr_stale_clientid;
3938 if (is_client_expired(clp))
3939 /*
3940 * The following error isn't really legal.
3941 * But we only get here if the client just explicitly
3942 * destroyed the client. Surely it no longer cares what
3943 * error it gets back on an operation for the dead
3944 * client.
3945 */
3946 goto out;
3947
3948 status = nfs_ok;
3949 nfsd4_client_record_create(clp);
3950 inc_reclaim_complete(clp);
3951 out:
3952 return status;
3953 }
3954
3955 __be32
nfsd4_setclientid(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)3956 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3957 union nfsd4_op_u *u)
3958 {
3959 struct nfsd4_setclientid *setclid = &u->setclientid;
3960 struct xdr_netobj clname = setclid->se_name;
3961 nfs4_verifier clverifier = setclid->se_verf;
3962 struct nfs4_client *conf, *new;
3963 struct nfs4_client *unconf = NULL;
3964 __be32 status;
3965 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3966
3967 new = create_client(clname, rqstp, &clverifier);
3968 if (new == NULL)
3969 return nfserr_jukebox;
3970 /* Cases below refer to rfc 3530 section 14.2.33: */
3971 spin_lock(&nn->client_lock);
3972 conf = find_confirmed_client_by_name(&clname, nn);
3973 if (conf && client_has_state(conf)) {
3974 /* case 0: */
3975 status = nfserr_clid_inuse;
3976 if (clp_used_exchangeid(conf))
3977 goto out;
3978 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
3979 trace_nfsd_clid_inuse_err(conf);
3980 goto out;
3981 }
3982 }
3983 unconf = find_unconfirmed_client_by_name(&clname, nn);
3984 if (unconf)
3985 unhash_client_locked(unconf);
3986 /* We need to handle only case 1: probable callback update */
3987 if (conf && same_verf(&conf->cl_verifier, &clverifier)) {
3988 copy_clid(new, conf);
3989 gen_confirm(new, nn);
3990 }
3991 new->cl_minorversion = 0;
3992 gen_callback(new, setclid, rqstp);
3993 add_to_unconfirmed(new);
3994 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
3995 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
3996 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
3997 new = NULL;
3998 status = nfs_ok;
3999 out:
4000 spin_unlock(&nn->client_lock);
4001 if (new)
4002 free_client(new);
4003 if (unconf)
4004 expire_client(unconf);
4005 return status;
4006 }
4007
4008
4009 __be32
nfsd4_setclientid_confirm(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)4010 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
4011 struct nfsd4_compound_state *cstate,
4012 union nfsd4_op_u *u)
4013 {
4014 struct nfsd4_setclientid_confirm *setclientid_confirm =
4015 &u->setclientid_confirm;
4016 struct nfs4_client *conf, *unconf;
4017 struct nfs4_client *old = NULL;
4018 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
4019 clientid_t * clid = &setclientid_confirm->sc_clientid;
4020 __be32 status;
4021 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4022
4023 if (STALE_CLIENTID(clid, nn))
4024 return nfserr_stale_clientid;
4025
4026 spin_lock(&nn->client_lock);
4027 conf = find_confirmed_client(clid, false, nn);
4028 unconf = find_unconfirmed_client(clid, false, nn);
4029 /*
4030 * We try hard to give out unique clientid's, so if we get an
4031 * attempt to confirm the same clientid with a different cred,
4032 * the client may be buggy; this should never happen.
4033 *
4034 * Nevertheless, RFC 7530 recommends INUSE for this case:
4035 */
4036 status = nfserr_clid_inuse;
4037 if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
4038 goto out;
4039 if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
4040 goto out;
4041 /* cases below refer to rfc 3530 section 14.2.34: */
4042 if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
4043 if (conf && same_verf(&confirm, &conf->cl_confirm)) {
4044 /* case 2: probable retransmit */
4045 status = nfs_ok;
4046 } else /* case 4: client hasn't noticed we rebooted yet? */
4047 status = nfserr_stale_clientid;
4048 goto out;
4049 }
4050 status = nfs_ok;
4051 if (conf) { /* case 1: callback update */
4052 old = unconf;
4053 unhash_client_locked(old);
4054 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
4055 } else { /* case 3: normal case; new or rebooted client */
4056 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
4057 if (old) {
4058 status = nfserr_clid_inuse;
4059 if (client_has_state(old)
4060 && !same_creds(&unconf->cl_cred,
4061 &old->cl_cred))
4062 goto out;
4063 status = mark_client_expired_locked(old);
4064 if (status) {
4065 old = NULL;
4066 goto out;
4067 }
4068 }
4069 move_to_confirmed(unconf);
4070 conf = unconf;
4071 }
4072 get_client_locked(conf);
4073 spin_unlock(&nn->client_lock);
4074 nfsd4_probe_callback(conf);
4075 spin_lock(&nn->client_lock);
4076 put_client_renew_locked(conf);
4077 out:
4078 spin_unlock(&nn->client_lock);
4079 if (old)
4080 expire_client(old);
4081 return status;
4082 }
4083
nfsd4_alloc_file(void)4084 static struct nfs4_file *nfsd4_alloc_file(void)
4085 {
4086 return kmem_cache_alloc(file_slab, GFP_KERNEL);
4087 }
4088
4089 /* OPEN Share state helper functions */
nfsd4_init_file(struct svc_fh * fh,unsigned int hashval,struct nfs4_file * fp)4090 static void nfsd4_init_file(struct svc_fh *fh, unsigned int hashval,
4091 struct nfs4_file *fp)
4092 {
4093 lockdep_assert_held(&state_lock);
4094
4095 refcount_set(&fp->fi_ref, 1);
4096 spin_lock_init(&fp->fi_lock);
4097 INIT_LIST_HEAD(&fp->fi_stateids);
4098 INIT_LIST_HEAD(&fp->fi_delegations);
4099 INIT_LIST_HEAD(&fp->fi_clnt_odstate);
4100 fh_copy_shallow(&fp->fi_fhandle, &fh->fh_handle);
4101 fp->fi_deleg_file = NULL;
4102 fp->fi_had_conflict = false;
4103 fp->fi_share_deny = 0;
4104 memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
4105 memset(fp->fi_access, 0, sizeof(fp->fi_access));
4106 fp->fi_aliased = false;
4107 fp->fi_inode = d_inode(fh->fh_dentry);
4108 #ifdef CONFIG_NFSD_PNFS
4109 INIT_LIST_HEAD(&fp->fi_lo_states);
4110 atomic_set(&fp->fi_lo_recalls, 0);
4111 #endif
4112 hlist_add_head_rcu(&fp->fi_hash, &file_hashtbl[hashval]);
4113 }
4114
4115 void
nfsd4_free_slabs(void)4116 nfsd4_free_slabs(void)
4117 {
4118 kmem_cache_destroy(client_slab);
4119 kmem_cache_destroy(openowner_slab);
4120 kmem_cache_destroy(lockowner_slab);
4121 kmem_cache_destroy(file_slab);
4122 kmem_cache_destroy(stateid_slab);
4123 kmem_cache_destroy(deleg_slab);
4124 kmem_cache_destroy(odstate_slab);
4125 }
4126
4127 int
nfsd4_init_slabs(void)4128 nfsd4_init_slabs(void)
4129 {
4130 client_slab = kmem_cache_create("nfsd4_clients",
4131 sizeof(struct nfs4_client), 0, 0, NULL);
4132 if (client_slab == NULL)
4133 goto out;
4134 openowner_slab = kmem_cache_create("nfsd4_openowners",
4135 sizeof(struct nfs4_openowner), 0, 0, NULL);
4136 if (openowner_slab == NULL)
4137 goto out_free_client_slab;
4138 lockowner_slab = kmem_cache_create("nfsd4_lockowners",
4139 sizeof(struct nfs4_lockowner), 0, 0, NULL);
4140 if (lockowner_slab == NULL)
4141 goto out_free_openowner_slab;
4142 file_slab = kmem_cache_create("nfsd4_files",
4143 sizeof(struct nfs4_file), 0, 0, NULL);
4144 if (file_slab == NULL)
4145 goto out_free_lockowner_slab;
4146 stateid_slab = kmem_cache_create("nfsd4_stateids",
4147 sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
4148 if (stateid_slab == NULL)
4149 goto out_free_file_slab;
4150 deleg_slab = kmem_cache_create("nfsd4_delegations",
4151 sizeof(struct nfs4_delegation), 0, 0, NULL);
4152 if (deleg_slab == NULL)
4153 goto out_free_stateid_slab;
4154 odstate_slab = kmem_cache_create("nfsd4_odstate",
4155 sizeof(struct nfs4_clnt_odstate), 0, 0, NULL);
4156 if (odstate_slab == NULL)
4157 goto out_free_deleg_slab;
4158 return 0;
4159
4160 out_free_deleg_slab:
4161 kmem_cache_destroy(deleg_slab);
4162 out_free_stateid_slab:
4163 kmem_cache_destroy(stateid_slab);
4164 out_free_file_slab:
4165 kmem_cache_destroy(file_slab);
4166 out_free_lockowner_slab:
4167 kmem_cache_destroy(lockowner_slab);
4168 out_free_openowner_slab:
4169 kmem_cache_destroy(openowner_slab);
4170 out_free_client_slab:
4171 kmem_cache_destroy(client_slab);
4172 out:
4173 return -ENOMEM;
4174 }
4175
init_nfs4_replay(struct nfs4_replay * rp)4176 static void init_nfs4_replay(struct nfs4_replay *rp)
4177 {
4178 rp->rp_status = nfserr_serverfault;
4179 rp->rp_buflen = 0;
4180 rp->rp_buf = rp->rp_ibuf;
4181 mutex_init(&rp->rp_mutex);
4182 }
4183
nfsd4_cstate_assign_replay(struct nfsd4_compound_state * cstate,struct nfs4_stateowner * so)4184 static void nfsd4_cstate_assign_replay(struct nfsd4_compound_state *cstate,
4185 struct nfs4_stateowner *so)
4186 {
4187 if (!nfsd4_has_session(cstate)) {
4188 mutex_lock(&so->so_replay.rp_mutex);
4189 cstate->replay_owner = nfs4_get_stateowner(so);
4190 }
4191 }
4192
nfsd4_cstate_clear_replay(struct nfsd4_compound_state * cstate)4193 void nfsd4_cstate_clear_replay(struct nfsd4_compound_state *cstate)
4194 {
4195 struct nfs4_stateowner *so = cstate->replay_owner;
4196
4197 if (so != NULL) {
4198 cstate->replay_owner = NULL;
4199 mutex_unlock(&so->so_replay.rp_mutex);
4200 nfs4_put_stateowner(so);
4201 }
4202 }
4203
alloc_stateowner(struct kmem_cache * slab,struct xdr_netobj * owner,struct nfs4_client * clp)4204 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
4205 {
4206 struct nfs4_stateowner *sop;
4207
4208 sop = kmem_cache_alloc(slab, GFP_KERNEL);
4209 if (!sop)
4210 return NULL;
4211
4212 xdr_netobj_dup(&sop->so_owner, owner, GFP_KERNEL);
4213 if (!sop->so_owner.data) {
4214 kmem_cache_free(slab, sop);
4215 return NULL;
4216 }
4217
4218 INIT_LIST_HEAD(&sop->so_stateids);
4219 sop->so_client = clp;
4220 init_nfs4_replay(&sop->so_replay);
4221 atomic_set(&sop->so_count, 1);
4222 return sop;
4223 }
4224
hash_openowner(struct nfs4_openowner * oo,struct nfs4_client * clp,unsigned int strhashval)4225 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
4226 {
4227 lockdep_assert_held(&clp->cl_lock);
4228
4229 list_add(&oo->oo_owner.so_strhash,
4230 &clp->cl_ownerstr_hashtbl[strhashval]);
4231 list_add(&oo->oo_perclient, &clp->cl_openowners);
4232 }
4233
nfs4_unhash_openowner(struct nfs4_stateowner * so)4234 static void nfs4_unhash_openowner(struct nfs4_stateowner *so)
4235 {
4236 unhash_openowner_locked(openowner(so));
4237 }
4238
nfs4_free_openowner(struct nfs4_stateowner * so)4239 static void nfs4_free_openowner(struct nfs4_stateowner *so)
4240 {
4241 struct nfs4_openowner *oo = openowner(so);
4242
4243 kmem_cache_free(openowner_slab, oo);
4244 }
4245
4246 static const struct nfs4_stateowner_operations openowner_ops = {
4247 .so_unhash = nfs4_unhash_openowner,
4248 .so_free = nfs4_free_openowner,
4249 };
4250
4251 static struct nfs4_ol_stateid *
nfsd4_find_existing_open(struct nfs4_file * fp,struct nfsd4_open * open)4252 nfsd4_find_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
4253 {
4254 struct nfs4_ol_stateid *local, *ret = NULL;
4255 struct nfs4_openowner *oo = open->op_openowner;
4256
4257 lockdep_assert_held(&fp->fi_lock);
4258
4259 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
4260 /* ignore lock owners */
4261 if (local->st_stateowner->so_is_open_owner == 0)
4262 continue;
4263 if (local->st_stateowner != &oo->oo_owner)
4264 continue;
4265 if (local->st_stid.sc_type == NFS4_OPEN_STID) {
4266 ret = local;
4267 refcount_inc(&ret->st_stid.sc_count);
4268 break;
4269 }
4270 }
4271 return ret;
4272 }
4273
4274 static __be32
nfsd4_verify_open_stid(struct nfs4_stid * s)4275 nfsd4_verify_open_stid(struct nfs4_stid *s)
4276 {
4277 __be32 ret = nfs_ok;
4278
4279 switch (s->sc_type) {
4280 default:
4281 break;
4282 case 0:
4283 case NFS4_CLOSED_STID:
4284 case NFS4_CLOSED_DELEG_STID:
4285 ret = nfserr_bad_stateid;
4286 break;
4287 case NFS4_REVOKED_DELEG_STID:
4288 ret = nfserr_deleg_revoked;
4289 }
4290 return ret;
4291 }
4292
4293 /* Lock the stateid st_mutex, and deal with races with CLOSE */
4294 static __be32
nfsd4_lock_ol_stateid(struct nfs4_ol_stateid * stp)4295 nfsd4_lock_ol_stateid(struct nfs4_ol_stateid *stp)
4296 {
4297 __be32 ret;
4298
4299 mutex_lock_nested(&stp->st_mutex, LOCK_STATEID_MUTEX);
4300 ret = nfsd4_verify_open_stid(&stp->st_stid);
4301 if (ret != nfs_ok)
4302 mutex_unlock(&stp->st_mutex);
4303 return ret;
4304 }
4305
4306 static struct nfs4_ol_stateid *
nfsd4_find_and_lock_existing_open(struct nfs4_file * fp,struct nfsd4_open * open)4307 nfsd4_find_and_lock_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
4308 {
4309 struct nfs4_ol_stateid *stp;
4310 for (;;) {
4311 spin_lock(&fp->fi_lock);
4312 stp = nfsd4_find_existing_open(fp, open);
4313 spin_unlock(&fp->fi_lock);
4314 if (!stp || nfsd4_lock_ol_stateid(stp) == nfs_ok)
4315 break;
4316 nfs4_put_stid(&stp->st_stid);
4317 }
4318 return stp;
4319 }
4320
4321 static struct nfs4_openowner *
alloc_init_open_stateowner(unsigned int strhashval,struct nfsd4_open * open,struct nfsd4_compound_state * cstate)4322 alloc_init_open_stateowner(unsigned int strhashval, struct nfsd4_open *open,
4323 struct nfsd4_compound_state *cstate)
4324 {
4325 struct nfs4_client *clp = cstate->clp;
4326 struct nfs4_openowner *oo, *ret;
4327
4328 oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
4329 if (!oo)
4330 return NULL;
4331 oo->oo_owner.so_ops = &openowner_ops;
4332 oo->oo_owner.so_is_open_owner = 1;
4333 oo->oo_owner.so_seqid = open->op_seqid;
4334 oo->oo_flags = 0;
4335 if (nfsd4_has_session(cstate))
4336 oo->oo_flags |= NFS4_OO_CONFIRMED;
4337 oo->oo_time = 0;
4338 oo->oo_last_closed_stid = NULL;
4339 INIT_LIST_HEAD(&oo->oo_close_lru);
4340 spin_lock(&clp->cl_lock);
4341 ret = find_openstateowner_str_locked(strhashval, open, clp);
4342 if (ret == NULL) {
4343 hash_openowner(oo, clp, strhashval);
4344 ret = oo;
4345 } else
4346 nfs4_free_stateowner(&oo->oo_owner);
4347
4348 spin_unlock(&clp->cl_lock);
4349 return ret;
4350 }
4351
4352 static struct nfs4_ol_stateid *
init_open_stateid(struct nfs4_file * fp,struct nfsd4_open * open)4353 init_open_stateid(struct nfs4_file *fp, struct nfsd4_open *open)
4354 {
4355
4356 struct nfs4_openowner *oo = open->op_openowner;
4357 struct nfs4_ol_stateid *retstp = NULL;
4358 struct nfs4_ol_stateid *stp;
4359
4360 stp = open->op_stp;
4361 /* We are moving these outside of the spinlocks to avoid the warnings */
4362 mutex_init(&stp->st_mutex);
4363 mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX);
4364
4365 retry:
4366 spin_lock(&oo->oo_owner.so_client->cl_lock);
4367 spin_lock(&fp->fi_lock);
4368
4369 retstp = nfsd4_find_existing_open(fp, open);
4370 if (retstp)
4371 goto out_unlock;
4372
4373 open->op_stp = NULL;
4374 refcount_inc(&stp->st_stid.sc_count);
4375 stp->st_stid.sc_type = NFS4_OPEN_STID;
4376 INIT_LIST_HEAD(&stp->st_locks);
4377 stp->st_stateowner = nfs4_get_stateowner(&oo->oo_owner);
4378 get_nfs4_file(fp);
4379 stp->st_stid.sc_file = fp;
4380 stp->st_access_bmap = 0;
4381 stp->st_deny_bmap = 0;
4382 stp->st_openstp = NULL;
4383 list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
4384 list_add(&stp->st_perfile, &fp->fi_stateids);
4385
4386 out_unlock:
4387 spin_unlock(&fp->fi_lock);
4388 spin_unlock(&oo->oo_owner.so_client->cl_lock);
4389 if (retstp) {
4390 /* Handle races with CLOSE */
4391 if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
4392 nfs4_put_stid(&retstp->st_stid);
4393 goto retry;
4394 }
4395 /* To keep mutex tracking happy */
4396 mutex_unlock(&stp->st_mutex);
4397 stp = retstp;
4398 }
4399 return stp;
4400 }
4401
4402 /*
4403 * In the 4.0 case we need to keep the owners around a little while to handle
4404 * CLOSE replay. We still do need to release any file access that is held by
4405 * them before returning however.
4406 */
4407 static void
move_to_close_lru(struct nfs4_ol_stateid * s,struct net * net)4408 move_to_close_lru(struct nfs4_ol_stateid *s, struct net *net)
4409 {
4410 struct nfs4_ol_stateid *last;
4411 struct nfs4_openowner *oo = openowner(s->st_stateowner);
4412 struct nfsd_net *nn = net_generic(s->st_stid.sc_client->net,
4413 nfsd_net_id);
4414
4415 dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
4416
4417 /*
4418 * We know that we hold one reference via nfsd4_close, and another
4419 * "persistent" reference for the client. If the refcount is higher
4420 * than 2, then there are still calls in progress that are using this
4421 * stateid. We can't put the sc_file reference until they are finished.
4422 * Wait for the refcount to drop to 2. Since it has been unhashed,
4423 * there should be no danger of the refcount going back up again at
4424 * this point.
4425 */
4426 wait_event(close_wq, refcount_read(&s->st_stid.sc_count) == 2);
4427
4428 release_all_access(s);
4429 if (s->st_stid.sc_file) {
4430 put_nfs4_file(s->st_stid.sc_file);
4431 s->st_stid.sc_file = NULL;
4432 }
4433
4434 spin_lock(&nn->client_lock);
4435 last = oo->oo_last_closed_stid;
4436 oo->oo_last_closed_stid = s;
4437 list_move_tail(&oo->oo_close_lru, &nn->close_lru);
4438 oo->oo_time = ktime_get_boottime_seconds();
4439 spin_unlock(&nn->client_lock);
4440 if (last)
4441 nfs4_put_stid(&last->st_stid);
4442 }
4443
4444 /* search file_hashtbl[] for file */
4445 static struct nfs4_file *
find_file_locked(struct svc_fh * fh,unsigned int hashval)4446 find_file_locked(struct svc_fh *fh, unsigned int hashval)
4447 {
4448 struct nfs4_file *fp;
4449
4450 hlist_for_each_entry_rcu(fp, &file_hashtbl[hashval], fi_hash,
4451 lockdep_is_held(&state_lock)) {
4452 if (fh_match(&fp->fi_fhandle, &fh->fh_handle)) {
4453 if (refcount_inc_not_zero(&fp->fi_ref))
4454 return fp;
4455 }
4456 }
4457 return NULL;
4458 }
4459
insert_file(struct nfs4_file * new,struct svc_fh * fh,unsigned int hashval)4460 static struct nfs4_file *insert_file(struct nfs4_file *new, struct svc_fh *fh,
4461 unsigned int hashval)
4462 {
4463 struct nfs4_file *fp;
4464 struct nfs4_file *ret = NULL;
4465 bool alias_found = false;
4466
4467 spin_lock(&state_lock);
4468 hlist_for_each_entry_rcu(fp, &file_hashtbl[hashval], fi_hash,
4469 lockdep_is_held(&state_lock)) {
4470 if (fh_match(&fp->fi_fhandle, &fh->fh_handle)) {
4471 if (refcount_inc_not_zero(&fp->fi_ref))
4472 ret = fp;
4473 } else if (d_inode(fh->fh_dentry) == fp->fi_inode)
4474 fp->fi_aliased = alias_found = true;
4475 }
4476 if (likely(ret == NULL)) {
4477 nfsd4_init_file(fh, hashval, new);
4478 new->fi_aliased = alias_found;
4479 ret = new;
4480 }
4481 spin_unlock(&state_lock);
4482 return ret;
4483 }
4484
find_file(struct svc_fh * fh)4485 static struct nfs4_file * find_file(struct svc_fh *fh)
4486 {
4487 struct nfs4_file *fp;
4488 unsigned int hashval = file_hashval(fh);
4489
4490 rcu_read_lock();
4491 fp = find_file_locked(fh, hashval);
4492 rcu_read_unlock();
4493 return fp;
4494 }
4495
4496 static struct nfs4_file *
find_or_add_file(struct nfs4_file * new,struct svc_fh * fh)4497 find_or_add_file(struct nfs4_file *new, struct svc_fh *fh)
4498 {
4499 struct nfs4_file *fp;
4500 unsigned int hashval = file_hashval(fh);
4501
4502 rcu_read_lock();
4503 fp = find_file_locked(fh, hashval);
4504 rcu_read_unlock();
4505 if (fp)
4506 return fp;
4507
4508 return insert_file(new, fh, hashval);
4509 }
4510
4511 /*
4512 * Called to check deny when READ with all zero stateid or
4513 * WRITE with all zero or all one stateid
4514 */
4515 static __be32
nfs4_share_conflict(struct svc_fh * current_fh,unsigned int deny_type)4516 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
4517 {
4518 struct nfs4_file *fp;
4519 __be32 ret = nfs_ok;
4520
4521 fp = find_file(current_fh);
4522 if (!fp)
4523 return ret;
4524 /* Check for conflicting share reservations */
4525 spin_lock(&fp->fi_lock);
4526 if (fp->fi_share_deny & deny_type)
4527 ret = nfserr_locked;
4528 spin_unlock(&fp->fi_lock);
4529 put_nfs4_file(fp);
4530 return ret;
4531 }
4532
nfsd4_cb_recall_prepare(struct nfsd4_callback * cb)4533 static void nfsd4_cb_recall_prepare(struct nfsd4_callback *cb)
4534 {
4535 struct nfs4_delegation *dp = cb_to_delegation(cb);
4536 struct nfsd_net *nn = net_generic(dp->dl_stid.sc_client->net,
4537 nfsd_net_id);
4538
4539 block_delegations(&dp->dl_stid.sc_file->fi_fhandle);
4540
4541 /*
4542 * We can't do this in nfsd_break_deleg_cb because it is
4543 * already holding inode->i_lock.
4544 *
4545 * If the dl_time != 0, then we know that it has already been
4546 * queued for a lease break. Don't queue it again.
4547 */
4548 spin_lock(&state_lock);
4549 if (dp->dl_time == 0) {
4550 dp->dl_time = ktime_get_boottime_seconds();
4551 list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
4552 }
4553 spin_unlock(&state_lock);
4554 }
4555
nfsd4_cb_recall_done(struct nfsd4_callback * cb,struct rpc_task * task)4556 static int nfsd4_cb_recall_done(struct nfsd4_callback *cb,
4557 struct rpc_task *task)
4558 {
4559 struct nfs4_delegation *dp = cb_to_delegation(cb);
4560
4561 if (dp->dl_stid.sc_type == NFS4_CLOSED_DELEG_STID ||
4562 dp->dl_stid.sc_type == NFS4_REVOKED_DELEG_STID)
4563 return 1;
4564
4565 switch (task->tk_status) {
4566 case 0:
4567 return 1;
4568 case -NFS4ERR_DELAY:
4569 rpc_delay(task, 2 * HZ);
4570 return 0;
4571 case -EBADHANDLE:
4572 case -NFS4ERR_BAD_STATEID:
4573 /*
4574 * Race: client probably got cb_recall before open reply
4575 * granting delegation.
4576 */
4577 if (dp->dl_retries--) {
4578 rpc_delay(task, 2 * HZ);
4579 return 0;
4580 }
4581 fallthrough;
4582 default:
4583 return 1;
4584 }
4585 }
4586
nfsd4_cb_recall_release(struct nfsd4_callback * cb)4587 static void nfsd4_cb_recall_release(struct nfsd4_callback *cb)
4588 {
4589 struct nfs4_delegation *dp = cb_to_delegation(cb);
4590
4591 nfs4_put_stid(&dp->dl_stid);
4592 }
4593
4594 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops = {
4595 .prepare = nfsd4_cb_recall_prepare,
4596 .done = nfsd4_cb_recall_done,
4597 .release = nfsd4_cb_recall_release,
4598 };
4599
nfsd_break_one_deleg(struct nfs4_delegation * dp)4600 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
4601 {
4602 /*
4603 * We're assuming the state code never drops its reference
4604 * without first removing the lease. Since we're in this lease
4605 * callback (and since the lease code is serialized by the
4606 * i_lock) we know the server hasn't removed the lease yet, and
4607 * we know it's safe to take a reference.
4608 */
4609 refcount_inc(&dp->dl_stid.sc_count);
4610 nfsd4_run_cb(&dp->dl_recall);
4611 }
4612
4613 /* Called from break_lease() with i_lock held. */
4614 static bool
nfsd_break_deleg_cb(struct file_lock * fl)4615 nfsd_break_deleg_cb(struct file_lock *fl)
4616 {
4617 bool ret = false;
4618 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
4619 struct nfs4_file *fp = dp->dl_stid.sc_file;
4620
4621 trace_nfsd_deleg_break(&dp->dl_stid.sc_stateid);
4622
4623 /*
4624 * We don't want the locks code to timeout the lease for us;
4625 * we'll remove it ourself if a delegation isn't returned
4626 * in time:
4627 */
4628 fl->fl_break_time = 0;
4629
4630 spin_lock(&fp->fi_lock);
4631 fp->fi_had_conflict = true;
4632 nfsd_break_one_deleg(dp);
4633 spin_unlock(&fp->fi_lock);
4634 return ret;
4635 }
4636
nfsd_breaker_owns_lease(struct file_lock * fl)4637 static bool nfsd_breaker_owns_lease(struct file_lock *fl)
4638 {
4639 struct nfs4_delegation *dl = fl->fl_owner;
4640 struct svc_rqst *rqst;
4641 struct nfs4_client *clp;
4642
4643 if (!i_am_nfsd())
4644 return NULL;
4645 rqst = kthread_data(current);
4646 /* Note rq_prog == NFS_ACL_PROGRAM is also possible: */
4647 if (rqst->rq_prog != NFS_PROGRAM || rqst->rq_vers < 4)
4648 return NULL;
4649 clp = *(rqst->rq_lease_breaker);
4650 return dl->dl_stid.sc_client == clp;
4651 }
4652
4653 static int
nfsd_change_deleg_cb(struct file_lock * onlist,int arg,struct list_head * dispose)4654 nfsd_change_deleg_cb(struct file_lock *onlist, int arg,
4655 struct list_head *dispose)
4656 {
4657 if (arg & F_UNLCK)
4658 return lease_modify(onlist, arg, dispose);
4659 else
4660 return -EAGAIN;
4661 }
4662
4663 static const struct lock_manager_operations nfsd_lease_mng_ops = {
4664 .lm_breaker_owns_lease = nfsd_breaker_owns_lease,
4665 .lm_break = nfsd_break_deleg_cb,
4666 .lm_change = nfsd_change_deleg_cb,
4667 };
4668
nfsd4_check_seqid(struct nfsd4_compound_state * cstate,struct nfs4_stateowner * so,u32 seqid)4669 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
4670 {
4671 if (nfsd4_has_session(cstate))
4672 return nfs_ok;
4673 if (seqid == so->so_seqid - 1)
4674 return nfserr_replay_me;
4675 if (seqid == so->so_seqid)
4676 return nfs_ok;
4677 return nfserr_bad_seqid;
4678 }
4679
lookup_clientid(clientid_t * clid,bool sessions,struct nfsd_net * nn)4680 static struct nfs4_client *lookup_clientid(clientid_t *clid, bool sessions,
4681 struct nfsd_net *nn)
4682 {
4683 struct nfs4_client *found;
4684
4685 spin_lock(&nn->client_lock);
4686 found = find_confirmed_client(clid, sessions, nn);
4687 if (found)
4688 atomic_inc(&found->cl_rpc_users);
4689 spin_unlock(&nn->client_lock);
4690 return found;
4691 }
4692
set_client(clientid_t * clid,struct nfsd4_compound_state * cstate,struct nfsd_net * nn)4693 static __be32 set_client(clientid_t *clid,
4694 struct nfsd4_compound_state *cstate,
4695 struct nfsd_net *nn)
4696 {
4697 if (cstate->clp) {
4698 if (!same_clid(&cstate->clp->cl_clientid, clid))
4699 return nfserr_stale_clientid;
4700 return nfs_ok;
4701 }
4702 if (STALE_CLIENTID(clid, nn))
4703 return nfserr_stale_clientid;
4704 /*
4705 * We're in the 4.0 case (otherwise the SEQUENCE op would have
4706 * set cstate->clp), so session = false:
4707 */
4708 cstate->clp = lookup_clientid(clid, false, nn);
4709 if (!cstate->clp)
4710 return nfserr_expired;
4711 return nfs_ok;
4712 }
4713
4714 __be32
nfsd4_process_open1(struct nfsd4_compound_state * cstate,struct nfsd4_open * open,struct nfsd_net * nn)4715 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
4716 struct nfsd4_open *open, struct nfsd_net *nn)
4717 {
4718 clientid_t *clientid = &open->op_clientid;
4719 struct nfs4_client *clp = NULL;
4720 unsigned int strhashval;
4721 struct nfs4_openowner *oo = NULL;
4722 __be32 status;
4723
4724 /*
4725 * In case we need it later, after we've already created the
4726 * file and don't want to risk a further failure:
4727 */
4728 open->op_file = nfsd4_alloc_file();
4729 if (open->op_file == NULL)
4730 return nfserr_jukebox;
4731
4732 status = set_client(clientid, cstate, nn);
4733 if (status)
4734 return status;
4735 clp = cstate->clp;
4736
4737 strhashval = ownerstr_hashval(&open->op_owner);
4738 oo = find_openstateowner_str(strhashval, open, clp);
4739 open->op_openowner = oo;
4740 if (!oo) {
4741 goto new_owner;
4742 }
4743 if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
4744 /* Replace unconfirmed owners without checking for replay. */
4745 release_openowner(oo);
4746 open->op_openowner = NULL;
4747 goto new_owner;
4748 }
4749 status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
4750 if (status)
4751 return status;
4752 goto alloc_stateid;
4753 new_owner:
4754 oo = alloc_init_open_stateowner(strhashval, open, cstate);
4755 if (oo == NULL)
4756 return nfserr_jukebox;
4757 open->op_openowner = oo;
4758 alloc_stateid:
4759 open->op_stp = nfs4_alloc_open_stateid(clp);
4760 if (!open->op_stp)
4761 return nfserr_jukebox;
4762
4763 if (nfsd4_has_session(cstate) &&
4764 (cstate->current_fh.fh_export->ex_flags & NFSEXP_PNFS)) {
4765 open->op_odstate = alloc_clnt_odstate(clp);
4766 if (!open->op_odstate)
4767 return nfserr_jukebox;
4768 }
4769
4770 return nfs_ok;
4771 }
4772
4773 static inline __be32
nfs4_check_delegmode(struct nfs4_delegation * dp,int flags)4774 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
4775 {
4776 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
4777 return nfserr_openmode;
4778 else
4779 return nfs_ok;
4780 }
4781
share_access_to_flags(u32 share_access)4782 static int share_access_to_flags(u32 share_access)
4783 {
4784 return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
4785 }
4786
find_deleg_stateid(struct nfs4_client * cl,stateid_t * s)4787 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
4788 {
4789 struct nfs4_stid *ret;
4790
4791 ret = find_stateid_by_type(cl, s,
4792 NFS4_DELEG_STID|NFS4_REVOKED_DELEG_STID);
4793 if (!ret)
4794 return NULL;
4795 return delegstateid(ret);
4796 }
4797
nfsd4_is_deleg_cur(struct nfsd4_open * open)4798 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
4799 {
4800 return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
4801 open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
4802 }
4803
4804 static __be32
nfs4_check_deleg(struct nfs4_client * cl,struct nfsd4_open * open,struct nfs4_delegation ** dp)4805 nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
4806 struct nfs4_delegation **dp)
4807 {
4808 int flags;
4809 __be32 status = nfserr_bad_stateid;
4810 struct nfs4_delegation *deleg;
4811
4812 deleg = find_deleg_stateid(cl, &open->op_delegate_stateid);
4813 if (deleg == NULL)
4814 goto out;
4815 if (deleg->dl_stid.sc_type == NFS4_REVOKED_DELEG_STID) {
4816 nfs4_put_stid(&deleg->dl_stid);
4817 if (cl->cl_minorversion)
4818 status = nfserr_deleg_revoked;
4819 goto out;
4820 }
4821 flags = share_access_to_flags(open->op_share_access);
4822 status = nfs4_check_delegmode(deleg, flags);
4823 if (status) {
4824 nfs4_put_stid(&deleg->dl_stid);
4825 goto out;
4826 }
4827 *dp = deleg;
4828 out:
4829 if (!nfsd4_is_deleg_cur(open))
4830 return nfs_ok;
4831 if (status)
4832 return status;
4833 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
4834 return nfs_ok;
4835 }
4836
nfs4_access_to_access(u32 nfs4_access)4837 static inline int nfs4_access_to_access(u32 nfs4_access)
4838 {
4839 int flags = 0;
4840
4841 if (nfs4_access & NFS4_SHARE_ACCESS_READ)
4842 flags |= NFSD_MAY_READ;
4843 if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
4844 flags |= NFSD_MAY_WRITE;
4845 return flags;
4846 }
4847
4848 static inline __be32
nfsd4_truncate(struct svc_rqst * rqstp,struct svc_fh * fh,struct nfsd4_open * open)4849 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
4850 struct nfsd4_open *open)
4851 {
4852 struct iattr iattr = {
4853 .ia_valid = ATTR_SIZE,
4854 .ia_size = 0,
4855 };
4856 if (!open->op_truncate)
4857 return 0;
4858 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
4859 return nfserr_inval;
4860 return nfsd_setattr(rqstp, fh, &iattr, 0, (time64_t)0);
4861 }
4862
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)4863 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
4864 struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
4865 struct nfsd4_open *open)
4866 {
4867 struct nfsd_file *nf = NULL;
4868 __be32 status;
4869 int oflag = nfs4_access_to_omode(open->op_share_access);
4870 int access = nfs4_access_to_access(open->op_share_access);
4871 unsigned char old_access_bmap, old_deny_bmap;
4872
4873 spin_lock(&fp->fi_lock);
4874
4875 /*
4876 * Are we trying to set a deny mode that would conflict with
4877 * current access?
4878 */
4879 status = nfs4_file_check_deny(fp, open->op_share_deny);
4880 if (status != nfs_ok) {
4881 spin_unlock(&fp->fi_lock);
4882 goto out;
4883 }
4884
4885 /* set access to the file */
4886 status = nfs4_file_get_access(fp, open->op_share_access);
4887 if (status != nfs_ok) {
4888 spin_unlock(&fp->fi_lock);
4889 goto out;
4890 }
4891
4892 /* Set access bits in stateid */
4893 old_access_bmap = stp->st_access_bmap;
4894 set_access(open->op_share_access, stp);
4895
4896 /* Set new deny mask */
4897 old_deny_bmap = stp->st_deny_bmap;
4898 set_deny(open->op_share_deny, stp);
4899 fp->fi_share_deny |= (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
4900
4901 if (!fp->fi_fds[oflag]) {
4902 spin_unlock(&fp->fi_lock);
4903 status = nfsd_file_acquire(rqstp, cur_fh, access, &nf);
4904 if (status)
4905 goto out_put_access;
4906 spin_lock(&fp->fi_lock);
4907 if (!fp->fi_fds[oflag]) {
4908 fp->fi_fds[oflag] = nf;
4909 nf = NULL;
4910 }
4911 }
4912 spin_unlock(&fp->fi_lock);
4913 if (nf)
4914 nfsd_file_put(nf);
4915
4916 status = nfserrno(nfsd_open_break_lease(cur_fh->fh_dentry->d_inode,
4917 access));
4918 if (status)
4919 goto out_put_access;
4920
4921 status = nfsd4_truncate(rqstp, cur_fh, open);
4922 if (status)
4923 goto out_put_access;
4924 out:
4925 return status;
4926 out_put_access:
4927 stp->st_access_bmap = old_access_bmap;
4928 nfs4_file_put_access(fp, open->op_share_access);
4929 reset_union_bmap_deny(bmap_to_share_mode(old_deny_bmap), stp);
4930 goto out;
4931 }
4932
4933 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)4934 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)
4935 {
4936 __be32 status;
4937 unsigned char old_deny_bmap = stp->st_deny_bmap;
4938
4939 if (!test_access(open->op_share_access, stp))
4940 return nfs4_get_vfs_file(rqstp, fp, cur_fh, stp, open);
4941
4942 /* test and set deny mode */
4943 spin_lock(&fp->fi_lock);
4944 status = nfs4_file_check_deny(fp, open->op_share_deny);
4945 if (status == nfs_ok) {
4946 set_deny(open->op_share_deny, stp);
4947 fp->fi_share_deny |=
4948 (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
4949 }
4950 spin_unlock(&fp->fi_lock);
4951
4952 if (status != nfs_ok)
4953 return status;
4954
4955 status = nfsd4_truncate(rqstp, cur_fh, open);
4956 if (status != nfs_ok)
4957 reset_union_bmap_deny(old_deny_bmap, stp);
4958 return status;
4959 }
4960
4961 /* Should we give out recallable state?: */
nfsd4_cb_channel_good(struct nfs4_client * clp)4962 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
4963 {
4964 if (clp->cl_cb_state == NFSD4_CB_UP)
4965 return true;
4966 /*
4967 * In the sessions case, since we don't have to establish a
4968 * separate connection for callbacks, we assume it's OK
4969 * until we hear otherwise:
4970 */
4971 return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
4972 }
4973
nfs4_alloc_init_lease(struct nfs4_delegation * dp,int flag)4974 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp,
4975 int flag)
4976 {
4977 struct file_lock *fl;
4978
4979 fl = locks_alloc_lock();
4980 if (!fl)
4981 return NULL;
4982 fl->fl_lmops = &nfsd_lease_mng_ops;
4983 fl->fl_flags = FL_DELEG;
4984 fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
4985 fl->fl_end = OFFSET_MAX;
4986 fl->fl_owner = (fl_owner_t)dp;
4987 fl->fl_pid = current->tgid;
4988 fl->fl_file = dp->dl_stid.sc_file->fi_deleg_file->nf_file;
4989 return fl;
4990 }
4991
nfsd4_check_conflicting_opens(struct nfs4_client * clp,struct nfs4_file * fp)4992 static int nfsd4_check_conflicting_opens(struct nfs4_client *clp,
4993 struct nfs4_file *fp)
4994 {
4995 struct nfs4_ol_stateid *st;
4996 struct file *f = fp->fi_deleg_file->nf_file;
4997 struct inode *ino = locks_inode(f);
4998 int writes;
4999
5000 writes = atomic_read(&ino->i_writecount);
5001 if (!writes)
5002 return 0;
5003 /*
5004 * There could be multiple filehandles (hence multiple
5005 * nfs4_files) referencing this file, but that's not too
5006 * common; let's just give up in that case rather than
5007 * trying to go look up all the clients using that other
5008 * nfs4_file as well:
5009 */
5010 if (fp->fi_aliased)
5011 return -EAGAIN;
5012 /*
5013 * If there's a close in progress, make sure that we see it
5014 * clear any fi_fds[] entries before we see it decrement
5015 * i_writecount:
5016 */
5017 smp_mb__after_atomic();
5018
5019 if (fp->fi_fds[O_WRONLY])
5020 writes--;
5021 if (fp->fi_fds[O_RDWR])
5022 writes--;
5023 if (writes > 0)
5024 return -EAGAIN; /* There may be non-NFSv4 writers */
5025 /*
5026 * It's possible there are non-NFSv4 write opens in progress,
5027 * but if they haven't incremented i_writecount yet then they
5028 * also haven't called break lease yet; so, they'll break this
5029 * lease soon enough. So, all that's left to check for is NFSv4
5030 * opens:
5031 */
5032 spin_lock(&fp->fi_lock);
5033 list_for_each_entry(st, &fp->fi_stateids, st_perfile) {
5034 if (st->st_openstp == NULL /* it's an open */ &&
5035 access_permit_write(st) &&
5036 st->st_stid.sc_client != clp) {
5037 spin_unlock(&fp->fi_lock);
5038 return -EAGAIN;
5039 }
5040 }
5041 spin_unlock(&fp->fi_lock);
5042 /*
5043 * There's a small chance that we could be racing with another
5044 * NFSv4 open. However, any open that hasn't added itself to
5045 * the fi_stateids list also hasn't called break_lease yet; so,
5046 * they'll break this lease soon enough.
5047 */
5048 return 0;
5049 }
5050
5051 static struct nfs4_delegation *
nfs4_set_delegation(struct nfs4_client * clp,struct svc_fh * fh,struct nfs4_file * fp,struct nfs4_clnt_odstate * odstate)5052 nfs4_set_delegation(struct nfs4_client *clp, struct svc_fh *fh,
5053 struct nfs4_file *fp, struct nfs4_clnt_odstate *odstate)
5054 {
5055 int status = 0;
5056 struct nfs4_delegation *dp;
5057 struct nfsd_file *nf;
5058 struct file_lock *fl;
5059
5060 /*
5061 * The fi_had_conflict and nfs_get_existing_delegation checks
5062 * here are just optimizations; we'll need to recheck them at
5063 * the end:
5064 */
5065 if (fp->fi_had_conflict)
5066 return ERR_PTR(-EAGAIN);
5067
5068 nf = find_readable_file(fp);
5069 if (!nf) {
5070 /*
5071 * We probably could attempt another open and get a read
5072 * delegation, but for now, don't bother until the
5073 * client actually sends us one.
5074 */
5075 return ERR_PTR(-EAGAIN);
5076 }
5077 spin_lock(&state_lock);
5078 spin_lock(&fp->fi_lock);
5079 if (nfs4_delegation_exists(clp, fp))
5080 status = -EAGAIN;
5081 else if (!fp->fi_deleg_file) {
5082 fp->fi_deleg_file = nf;
5083 /* increment early to prevent fi_deleg_file from being
5084 * cleared */
5085 fp->fi_delegees = 1;
5086 nf = NULL;
5087 } else
5088 fp->fi_delegees++;
5089 spin_unlock(&fp->fi_lock);
5090 spin_unlock(&state_lock);
5091 if (nf)
5092 nfsd_file_put(nf);
5093 if (status)
5094 return ERR_PTR(status);
5095
5096 status = -ENOMEM;
5097 dp = alloc_init_deleg(clp, fp, fh, odstate);
5098 if (!dp)
5099 goto out_delegees;
5100
5101 fl = nfs4_alloc_init_lease(dp, NFS4_OPEN_DELEGATE_READ);
5102 if (!fl)
5103 goto out_clnt_odstate;
5104
5105 status = vfs_setlease(fp->fi_deleg_file->nf_file, fl->fl_type, &fl, NULL);
5106 if (fl)
5107 locks_free_lock(fl);
5108 if (status)
5109 goto out_clnt_odstate;
5110 status = nfsd4_check_conflicting_opens(clp, fp);
5111 if (status)
5112 goto out_unlock;
5113
5114 spin_lock(&state_lock);
5115 spin_lock(&fp->fi_lock);
5116 if (fp->fi_had_conflict)
5117 status = -EAGAIN;
5118 else
5119 status = hash_delegation_locked(dp, fp);
5120 spin_unlock(&fp->fi_lock);
5121 spin_unlock(&state_lock);
5122
5123 if (status)
5124 goto out_unlock;
5125
5126 return dp;
5127 out_unlock:
5128 vfs_setlease(fp->fi_deleg_file->nf_file, F_UNLCK, NULL, (void **)&dp);
5129 out_clnt_odstate:
5130 put_clnt_odstate(dp->dl_clnt_odstate);
5131 nfs4_put_stid(&dp->dl_stid);
5132 out_delegees:
5133 put_deleg_file(fp);
5134 return ERR_PTR(status);
5135 }
5136
nfsd4_open_deleg_none_ext(struct nfsd4_open * open,int status)5137 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
5138 {
5139 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
5140 if (status == -EAGAIN)
5141 open->op_why_no_deleg = WND4_CONTENTION;
5142 else {
5143 open->op_why_no_deleg = WND4_RESOURCE;
5144 switch (open->op_deleg_want) {
5145 case NFS4_SHARE_WANT_READ_DELEG:
5146 case NFS4_SHARE_WANT_WRITE_DELEG:
5147 case NFS4_SHARE_WANT_ANY_DELEG:
5148 break;
5149 case NFS4_SHARE_WANT_CANCEL:
5150 open->op_why_no_deleg = WND4_CANCELLED;
5151 break;
5152 case NFS4_SHARE_WANT_NO_DELEG:
5153 WARN_ON_ONCE(1);
5154 }
5155 }
5156 }
5157
5158 /*
5159 * Attempt to hand out a delegation.
5160 *
5161 * Note we don't support write delegations, and won't until the vfs has
5162 * proper support for them.
5163 */
5164 static void
nfs4_open_delegation(struct svc_fh * fh,struct nfsd4_open * open,struct nfs4_ol_stateid * stp)5165 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open,
5166 struct nfs4_ol_stateid *stp)
5167 {
5168 struct nfs4_delegation *dp;
5169 struct nfs4_openowner *oo = openowner(stp->st_stateowner);
5170 struct nfs4_client *clp = stp->st_stid.sc_client;
5171 int cb_up;
5172 int status = 0;
5173
5174 cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
5175 open->op_recall = 0;
5176 switch (open->op_claim_type) {
5177 case NFS4_OPEN_CLAIM_PREVIOUS:
5178 if (!cb_up)
5179 open->op_recall = 1;
5180 if (open->op_delegate_type != NFS4_OPEN_DELEGATE_READ)
5181 goto out_no_deleg;
5182 break;
5183 case NFS4_OPEN_CLAIM_NULL:
5184 case NFS4_OPEN_CLAIM_FH:
5185 /*
5186 * Let's not give out any delegations till everyone's
5187 * had the chance to reclaim theirs, *and* until
5188 * NLM locks have all been reclaimed:
5189 */
5190 if (locks_in_grace(clp->net))
5191 goto out_no_deleg;
5192 if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
5193 goto out_no_deleg;
5194 break;
5195 default:
5196 goto out_no_deleg;
5197 }
5198 dp = nfs4_set_delegation(clp, fh, stp->st_stid.sc_file, stp->st_clnt_odstate);
5199 if (IS_ERR(dp))
5200 goto out_no_deleg;
5201
5202 memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
5203
5204 trace_nfsd_deleg_read(&dp->dl_stid.sc_stateid);
5205 open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
5206 nfs4_put_stid(&dp->dl_stid);
5207 return;
5208 out_no_deleg:
5209 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
5210 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
5211 open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) {
5212 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
5213 open->op_recall = 1;
5214 }
5215
5216 /* 4.1 client asking for a delegation? */
5217 if (open->op_deleg_want)
5218 nfsd4_open_deleg_none_ext(open, status);
5219 return;
5220 }
5221
nfsd4_deleg_xgrade_none_ext(struct nfsd4_open * open,struct nfs4_delegation * dp)5222 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
5223 struct nfs4_delegation *dp)
5224 {
5225 if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
5226 dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
5227 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
5228 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
5229 } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
5230 dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
5231 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
5232 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
5233 }
5234 /* Otherwise the client must be confused wanting a delegation
5235 * it already has, therefore we don't return
5236 * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
5237 */
5238 }
5239
5240 __be32
nfsd4_process_open2(struct svc_rqst * rqstp,struct svc_fh * current_fh,struct nfsd4_open * open)5241 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
5242 {
5243 struct nfsd4_compoundres *resp = rqstp->rq_resp;
5244 struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
5245 struct nfs4_file *fp = NULL;
5246 struct nfs4_ol_stateid *stp = NULL;
5247 struct nfs4_delegation *dp = NULL;
5248 __be32 status;
5249 bool new_stp = false;
5250
5251 /*
5252 * Lookup file; if found, lookup stateid and check open request,
5253 * and check for delegations in the process of being recalled.
5254 * If not found, create the nfs4_file struct
5255 */
5256 fp = find_or_add_file(open->op_file, current_fh);
5257 if (fp != open->op_file) {
5258 status = nfs4_check_deleg(cl, open, &dp);
5259 if (status)
5260 goto out;
5261 stp = nfsd4_find_and_lock_existing_open(fp, open);
5262 } else {
5263 open->op_file = NULL;
5264 status = nfserr_bad_stateid;
5265 if (nfsd4_is_deleg_cur(open))
5266 goto out;
5267 }
5268
5269 if (!stp) {
5270 stp = init_open_stateid(fp, open);
5271 if (!open->op_stp)
5272 new_stp = true;
5273 }
5274
5275 /*
5276 * OPEN the file, or upgrade an existing OPEN.
5277 * If truncate fails, the OPEN fails.
5278 *
5279 * stp is already locked.
5280 */
5281 if (!new_stp) {
5282 /* Stateid was found, this is an OPEN upgrade */
5283 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
5284 if (status) {
5285 mutex_unlock(&stp->st_mutex);
5286 goto out;
5287 }
5288 } else {
5289 status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open);
5290 if (status) {
5291 stp->st_stid.sc_type = NFS4_CLOSED_STID;
5292 release_open_stateid(stp);
5293 mutex_unlock(&stp->st_mutex);
5294 goto out;
5295 }
5296
5297 stp->st_clnt_odstate = find_or_hash_clnt_odstate(fp,
5298 open->op_odstate);
5299 if (stp->st_clnt_odstate == open->op_odstate)
5300 open->op_odstate = NULL;
5301 }
5302
5303 nfs4_inc_and_copy_stateid(&open->op_stateid, &stp->st_stid);
5304 mutex_unlock(&stp->st_mutex);
5305
5306 if (nfsd4_has_session(&resp->cstate)) {
5307 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
5308 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
5309 open->op_why_no_deleg = WND4_NOT_WANTED;
5310 goto nodeleg;
5311 }
5312 }
5313
5314 /*
5315 * Attempt to hand out a delegation. No error return, because the
5316 * OPEN succeeds even if we fail.
5317 */
5318 nfs4_open_delegation(current_fh, open, stp);
5319 nodeleg:
5320 status = nfs_ok;
5321 trace_nfsd_open(&stp->st_stid.sc_stateid);
5322 out:
5323 /* 4.1 client trying to upgrade/downgrade delegation? */
5324 if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
5325 open->op_deleg_want)
5326 nfsd4_deleg_xgrade_none_ext(open, dp);
5327
5328 if (fp)
5329 put_nfs4_file(fp);
5330 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
5331 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
5332 /*
5333 * To finish the open response, we just need to set the rflags.
5334 */
5335 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
5336 if (nfsd4_has_session(&resp->cstate))
5337 open->op_rflags |= NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK;
5338 else if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED))
5339 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
5340
5341 if (dp)
5342 nfs4_put_stid(&dp->dl_stid);
5343 if (stp)
5344 nfs4_put_stid(&stp->st_stid);
5345
5346 return status;
5347 }
5348
nfsd4_cleanup_open_state(struct nfsd4_compound_state * cstate,struct nfsd4_open * open)5349 void nfsd4_cleanup_open_state(struct nfsd4_compound_state *cstate,
5350 struct nfsd4_open *open)
5351 {
5352 if (open->op_openowner) {
5353 struct nfs4_stateowner *so = &open->op_openowner->oo_owner;
5354
5355 nfsd4_cstate_assign_replay(cstate, so);
5356 nfs4_put_stateowner(so);
5357 }
5358 if (open->op_file)
5359 kmem_cache_free(file_slab, open->op_file);
5360 if (open->op_stp)
5361 nfs4_put_stid(&open->op_stp->st_stid);
5362 if (open->op_odstate)
5363 kmem_cache_free(odstate_slab, open->op_odstate);
5364 }
5365
5366 __be32
nfsd4_renew(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)5367 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5368 union nfsd4_op_u *u)
5369 {
5370 clientid_t *clid = &u->renew;
5371 struct nfs4_client *clp;
5372 __be32 status;
5373 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5374
5375 trace_nfsd_clid_renew(clid);
5376 status = set_client(clid, cstate, nn);
5377 if (status)
5378 return status;
5379 clp = cstate->clp;
5380 if (!list_empty(&clp->cl_delegations)
5381 && clp->cl_cb_state != NFSD4_CB_UP)
5382 return nfserr_cb_path_down;
5383 return nfs_ok;
5384 }
5385
5386 void
nfsd4_end_grace(struct nfsd_net * nn)5387 nfsd4_end_grace(struct nfsd_net *nn)
5388 {
5389 /* do nothing if grace period already ended */
5390 if (nn->grace_ended)
5391 return;
5392
5393 trace_nfsd_grace_complete(nn);
5394 nn->grace_ended = true;
5395 /*
5396 * If the server goes down again right now, an NFSv4
5397 * client will still be allowed to reclaim after it comes back up,
5398 * even if it hasn't yet had a chance to reclaim state this time.
5399 *
5400 */
5401 nfsd4_record_grace_done(nn);
5402 /*
5403 * At this point, NFSv4 clients can still reclaim. But if the
5404 * server crashes, any that have not yet reclaimed will be out
5405 * of luck on the next boot.
5406 *
5407 * (NFSv4.1+ clients are considered to have reclaimed once they
5408 * call RECLAIM_COMPLETE. NFSv4.0 clients are considered to
5409 * have reclaimed after their first OPEN.)
5410 */
5411 locks_end_grace(&nn->nfsd4_manager);
5412 /*
5413 * At this point, and once lockd and/or any other containers
5414 * exit their grace period, further reclaims will fail and
5415 * regular locking can resume.
5416 */
5417 }
5418
5419 /*
5420 * If we've waited a lease period but there are still clients trying to
5421 * reclaim, wait a little longer to give them a chance to finish.
5422 */
clients_still_reclaiming(struct nfsd_net * nn)5423 static bool clients_still_reclaiming(struct nfsd_net *nn)
5424 {
5425 time64_t double_grace_period_end = nn->boot_time +
5426 2 * nn->nfsd4_lease;
5427
5428 if (nn->track_reclaim_completes &&
5429 atomic_read(&nn->nr_reclaim_complete) ==
5430 nn->reclaim_str_hashtbl_size)
5431 return false;
5432 if (!nn->somebody_reclaimed)
5433 return false;
5434 nn->somebody_reclaimed = false;
5435 /*
5436 * If we've given them *two* lease times to reclaim, and they're
5437 * still not done, give up:
5438 */
5439 if (ktime_get_boottime_seconds() > double_grace_period_end)
5440 return false;
5441 return true;
5442 }
5443
5444 struct laundry_time {
5445 time64_t cutoff;
5446 time64_t new_timeo;
5447 };
5448
state_expired(struct laundry_time * lt,time64_t last_refresh)5449 static bool state_expired(struct laundry_time *lt, time64_t last_refresh)
5450 {
5451 time64_t time_remaining;
5452
5453 if (last_refresh < lt->cutoff)
5454 return true;
5455 time_remaining = last_refresh - lt->cutoff;
5456 lt->new_timeo = min(lt->new_timeo, time_remaining);
5457 return false;
5458 }
5459
5460 static time64_t
nfs4_laundromat(struct nfsd_net * nn)5461 nfs4_laundromat(struct nfsd_net *nn)
5462 {
5463 struct nfs4_client *clp;
5464 struct nfs4_openowner *oo;
5465 struct nfs4_delegation *dp;
5466 struct nfs4_ol_stateid *stp;
5467 struct nfsd4_blocked_lock *nbl;
5468 struct list_head *pos, *next, reaplist;
5469 struct laundry_time lt = {
5470 .cutoff = ktime_get_boottime_seconds() - nn->nfsd4_lease,
5471 .new_timeo = nn->nfsd4_lease
5472 };
5473 struct nfs4_cpntf_state *cps;
5474 copy_stateid_t *cps_t;
5475 int i;
5476
5477 if (clients_still_reclaiming(nn)) {
5478 lt.new_timeo = 0;
5479 goto out;
5480 }
5481 nfsd4_end_grace(nn);
5482 INIT_LIST_HEAD(&reaplist);
5483
5484 spin_lock(&nn->s2s_cp_lock);
5485 idr_for_each_entry(&nn->s2s_cp_stateids, cps_t, i) {
5486 cps = container_of(cps_t, struct nfs4_cpntf_state, cp_stateid);
5487 if (cps->cp_stateid.sc_type == NFS4_COPYNOTIFY_STID &&
5488 state_expired(<, cps->cpntf_time))
5489 _free_cpntf_state_locked(nn, cps);
5490 }
5491 spin_unlock(&nn->s2s_cp_lock);
5492
5493 spin_lock(&nn->client_lock);
5494 list_for_each_safe(pos, next, &nn->client_lru) {
5495 clp = list_entry(pos, struct nfs4_client, cl_lru);
5496 if (!state_expired(<, clp->cl_time))
5497 break;
5498 if (mark_client_expired_locked(clp)) {
5499 trace_nfsd_clid_expired(&clp->cl_clientid);
5500 continue;
5501 }
5502 list_add(&clp->cl_lru, &reaplist);
5503 }
5504 spin_unlock(&nn->client_lock);
5505 list_for_each_safe(pos, next, &reaplist) {
5506 clp = list_entry(pos, struct nfs4_client, cl_lru);
5507 trace_nfsd_clid_purged(&clp->cl_clientid);
5508 list_del_init(&clp->cl_lru);
5509 expire_client(clp);
5510 }
5511 spin_lock(&state_lock);
5512 list_for_each_safe(pos, next, &nn->del_recall_lru) {
5513 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
5514 if (!state_expired(<, dp->dl_time))
5515 break;
5516 WARN_ON(!unhash_delegation_locked(dp));
5517 list_add(&dp->dl_recall_lru, &reaplist);
5518 }
5519 spin_unlock(&state_lock);
5520 while (!list_empty(&reaplist)) {
5521 dp = list_first_entry(&reaplist, struct nfs4_delegation,
5522 dl_recall_lru);
5523 list_del_init(&dp->dl_recall_lru);
5524 revoke_delegation(dp);
5525 }
5526
5527 spin_lock(&nn->client_lock);
5528 while (!list_empty(&nn->close_lru)) {
5529 oo = list_first_entry(&nn->close_lru, struct nfs4_openowner,
5530 oo_close_lru);
5531 if (!state_expired(<, oo->oo_time))
5532 break;
5533 list_del_init(&oo->oo_close_lru);
5534 stp = oo->oo_last_closed_stid;
5535 oo->oo_last_closed_stid = NULL;
5536 spin_unlock(&nn->client_lock);
5537 nfs4_put_stid(&stp->st_stid);
5538 spin_lock(&nn->client_lock);
5539 }
5540 spin_unlock(&nn->client_lock);
5541
5542 /*
5543 * It's possible for a client to try and acquire an already held lock
5544 * that is being held for a long time, and then lose interest in it.
5545 * So, we clean out any un-revisited request after a lease period
5546 * under the assumption that the client is no longer interested.
5547 *
5548 * RFC5661, sec. 9.6 states that the client must not rely on getting
5549 * notifications and must continue to poll for locks, even when the
5550 * server supports them. Thus this shouldn't lead to clients blocking
5551 * indefinitely once the lock does become free.
5552 */
5553 BUG_ON(!list_empty(&reaplist));
5554 spin_lock(&nn->blocked_locks_lock);
5555 while (!list_empty(&nn->blocked_locks_lru)) {
5556 nbl = list_first_entry(&nn->blocked_locks_lru,
5557 struct nfsd4_blocked_lock, nbl_lru);
5558 if (!state_expired(<, nbl->nbl_time))
5559 break;
5560 list_move(&nbl->nbl_lru, &reaplist);
5561 list_del_init(&nbl->nbl_list);
5562 }
5563 spin_unlock(&nn->blocked_locks_lock);
5564
5565 while (!list_empty(&reaplist)) {
5566 nbl = list_first_entry(&reaplist,
5567 struct nfsd4_blocked_lock, nbl_lru);
5568 list_del_init(&nbl->nbl_lru);
5569 free_blocked_lock(nbl);
5570 }
5571 out:
5572 return max_t(time64_t, lt.new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
5573 }
5574
5575 static struct workqueue_struct *laundry_wq;
5576 static void laundromat_main(struct work_struct *);
5577
5578 static void
laundromat_main(struct work_struct * laundry)5579 laundromat_main(struct work_struct *laundry)
5580 {
5581 time64_t t;
5582 struct delayed_work *dwork = to_delayed_work(laundry);
5583 struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
5584 laundromat_work);
5585
5586 t = nfs4_laundromat(nn);
5587 queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
5588 }
5589
nfs4_check_fh(struct svc_fh * fhp,struct nfs4_stid * stp)5590 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stid *stp)
5591 {
5592 if (!fh_match(&fhp->fh_handle, &stp->sc_file->fi_fhandle))
5593 return nfserr_bad_stateid;
5594 return nfs_ok;
5595 }
5596
5597 static
nfs4_check_openmode(struct nfs4_ol_stateid * stp,int flags)5598 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
5599 {
5600 __be32 status = nfserr_openmode;
5601
5602 /* For lock stateid's, we test the parent open, not the lock: */
5603 if (stp->st_openstp)
5604 stp = stp->st_openstp;
5605 if ((flags & WR_STATE) && !access_permit_write(stp))
5606 goto out;
5607 if ((flags & RD_STATE) && !access_permit_read(stp))
5608 goto out;
5609 status = nfs_ok;
5610 out:
5611 return status;
5612 }
5613
5614 static inline __be32
check_special_stateids(struct net * net,svc_fh * current_fh,stateid_t * stateid,int flags)5615 check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
5616 {
5617 if (ONE_STATEID(stateid) && (flags & RD_STATE))
5618 return nfs_ok;
5619 else if (opens_in_grace(net)) {
5620 /* Answer in remaining cases depends on existence of
5621 * conflicting state; so we must wait out the grace period. */
5622 return nfserr_grace;
5623 } else if (flags & WR_STATE)
5624 return nfs4_share_conflict(current_fh,
5625 NFS4_SHARE_DENY_WRITE);
5626 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
5627 return nfs4_share_conflict(current_fh,
5628 NFS4_SHARE_DENY_READ);
5629 }
5630
5631 /*
5632 * Allow READ/WRITE during grace period on recovered state only for files
5633 * that are not able to provide mandatory locking.
5634 */
5635 static inline int
grace_disallows_io(struct net * net,struct inode * inode)5636 grace_disallows_io(struct net *net, struct inode *inode)
5637 {
5638 return opens_in_grace(net) && mandatory_lock(inode);
5639 }
5640
check_stateid_generation(stateid_t * in,stateid_t * ref,bool has_session)5641 static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
5642 {
5643 /*
5644 * When sessions are used the stateid generation number is ignored
5645 * when it is zero.
5646 */
5647 if (has_session && in->si_generation == 0)
5648 return nfs_ok;
5649
5650 if (in->si_generation == ref->si_generation)
5651 return nfs_ok;
5652
5653 /* If the client sends us a stateid from the future, it's buggy: */
5654 if (nfsd4_stateid_generation_after(in, ref))
5655 return nfserr_bad_stateid;
5656 /*
5657 * However, we could see a stateid from the past, even from a
5658 * non-buggy client. For example, if the client sends a lock
5659 * while some IO is outstanding, the lock may bump si_generation
5660 * while the IO is still in flight. The client could avoid that
5661 * situation by waiting for responses on all the IO requests,
5662 * but better performance may result in retrying IO that
5663 * receives an old_stateid error if requests are rarely
5664 * reordered in flight:
5665 */
5666 return nfserr_old_stateid;
5667 }
5668
nfsd4_stid_check_stateid_generation(stateid_t * in,struct nfs4_stid * s,bool has_session)5669 static __be32 nfsd4_stid_check_stateid_generation(stateid_t *in, struct nfs4_stid *s, bool has_session)
5670 {
5671 __be32 ret;
5672
5673 spin_lock(&s->sc_lock);
5674 ret = nfsd4_verify_open_stid(s);
5675 if (ret == nfs_ok)
5676 ret = check_stateid_generation(in, &s->sc_stateid, has_session);
5677 spin_unlock(&s->sc_lock);
5678 return ret;
5679 }
5680
nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid * ols)5681 static __be32 nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid *ols)
5682 {
5683 if (ols->st_stateowner->so_is_open_owner &&
5684 !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
5685 return nfserr_bad_stateid;
5686 return nfs_ok;
5687 }
5688
nfsd4_validate_stateid(struct nfs4_client * cl,stateid_t * stateid)5689 static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
5690 {
5691 struct nfs4_stid *s;
5692 __be32 status = nfserr_bad_stateid;
5693
5694 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
5695 CLOSE_STATEID(stateid))
5696 return status;
5697 if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid))
5698 return status;
5699 spin_lock(&cl->cl_lock);
5700 s = find_stateid_locked(cl, stateid);
5701 if (!s)
5702 goto out_unlock;
5703 status = nfsd4_stid_check_stateid_generation(stateid, s, 1);
5704 if (status)
5705 goto out_unlock;
5706 switch (s->sc_type) {
5707 case NFS4_DELEG_STID:
5708 status = nfs_ok;
5709 break;
5710 case NFS4_REVOKED_DELEG_STID:
5711 status = nfserr_deleg_revoked;
5712 break;
5713 case NFS4_OPEN_STID:
5714 case NFS4_LOCK_STID:
5715 status = nfsd4_check_openowner_confirmed(openlockstateid(s));
5716 break;
5717 default:
5718 printk("unknown stateid type %x\n", s->sc_type);
5719 fallthrough;
5720 case NFS4_CLOSED_STID:
5721 case NFS4_CLOSED_DELEG_STID:
5722 status = nfserr_bad_stateid;
5723 }
5724 out_unlock:
5725 spin_unlock(&cl->cl_lock);
5726 return status;
5727 }
5728
5729 __be32
nfsd4_lookup_stateid(struct nfsd4_compound_state * cstate,stateid_t * stateid,unsigned char typemask,struct nfs4_stid ** s,struct nfsd_net * nn)5730 nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
5731 stateid_t *stateid, unsigned char typemask,
5732 struct nfs4_stid **s, struct nfsd_net *nn)
5733 {
5734 __be32 status;
5735 bool return_revoked = false;
5736
5737 /*
5738 * only return revoked delegations if explicitly asked.
5739 * otherwise we report revoked or bad_stateid status.
5740 */
5741 if (typemask & NFS4_REVOKED_DELEG_STID)
5742 return_revoked = true;
5743 else if (typemask & NFS4_DELEG_STID)
5744 typemask |= NFS4_REVOKED_DELEG_STID;
5745
5746 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
5747 CLOSE_STATEID(stateid))
5748 return nfserr_bad_stateid;
5749 status = set_client(&stateid->si_opaque.so_clid, cstate, nn);
5750 if (status == nfserr_stale_clientid) {
5751 if (cstate->session)
5752 return nfserr_bad_stateid;
5753 return nfserr_stale_stateid;
5754 }
5755 if (status)
5756 return status;
5757 *s = find_stateid_by_type(cstate->clp, stateid, typemask);
5758 if (!*s)
5759 return nfserr_bad_stateid;
5760 if (((*s)->sc_type == NFS4_REVOKED_DELEG_STID) && !return_revoked) {
5761 nfs4_put_stid(*s);
5762 if (cstate->minorversion)
5763 return nfserr_deleg_revoked;
5764 return nfserr_bad_stateid;
5765 }
5766 return nfs_ok;
5767 }
5768
5769 static struct nfsd_file *
nfs4_find_file(struct nfs4_stid * s,int flags)5770 nfs4_find_file(struct nfs4_stid *s, int flags)
5771 {
5772 if (!s)
5773 return NULL;
5774
5775 switch (s->sc_type) {
5776 case NFS4_DELEG_STID:
5777 if (WARN_ON_ONCE(!s->sc_file->fi_deleg_file))
5778 return NULL;
5779 return nfsd_file_get(s->sc_file->fi_deleg_file);
5780 case NFS4_OPEN_STID:
5781 case NFS4_LOCK_STID:
5782 if (flags & RD_STATE)
5783 return find_readable_file(s->sc_file);
5784 else
5785 return find_writeable_file(s->sc_file);
5786 }
5787
5788 return NULL;
5789 }
5790
5791 static __be32
nfs4_check_olstateid(struct nfs4_ol_stateid * ols,int flags)5792 nfs4_check_olstateid(struct nfs4_ol_stateid *ols, int flags)
5793 {
5794 __be32 status;
5795
5796 status = nfsd4_check_openowner_confirmed(ols);
5797 if (status)
5798 return status;
5799 return nfs4_check_openmode(ols, flags);
5800 }
5801
5802 static __be32
nfs4_check_file(struct svc_rqst * rqstp,struct svc_fh * fhp,struct nfs4_stid * s,struct nfsd_file ** nfp,int flags)5803 nfs4_check_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfs4_stid *s,
5804 struct nfsd_file **nfp, int flags)
5805 {
5806 int acc = (flags & RD_STATE) ? NFSD_MAY_READ : NFSD_MAY_WRITE;
5807 struct nfsd_file *nf;
5808 __be32 status;
5809
5810 nf = nfs4_find_file(s, flags);
5811 if (nf) {
5812 status = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
5813 acc | NFSD_MAY_OWNER_OVERRIDE);
5814 if (status) {
5815 nfsd_file_put(nf);
5816 goto out;
5817 }
5818 } else {
5819 status = nfsd_file_acquire(rqstp, fhp, acc, &nf);
5820 if (status)
5821 return status;
5822 }
5823 *nfp = nf;
5824 out:
5825 return status;
5826 }
5827 static void
_free_cpntf_state_locked(struct nfsd_net * nn,struct nfs4_cpntf_state * cps)5828 _free_cpntf_state_locked(struct nfsd_net *nn, struct nfs4_cpntf_state *cps)
5829 {
5830 WARN_ON_ONCE(cps->cp_stateid.sc_type != NFS4_COPYNOTIFY_STID);
5831 if (!refcount_dec_and_test(&cps->cp_stateid.sc_count))
5832 return;
5833 list_del(&cps->cp_list);
5834 idr_remove(&nn->s2s_cp_stateids,
5835 cps->cp_stateid.stid.si_opaque.so_id);
5836 kfree(cps);
5837 }
5838 /*
5839 * A READ from an inter server to server COPY will have a
5840 * copy stateid. Look up the copy notify stateid from the
5841 * idr structure and take a reference on it.
5842 */
manage_cpntf_state(struct nfsd_net * nn,stateid_t * st,struct nfs4_client * clp,struct nfs4_cpntf_state ** cps)5843 __be32 manage_cpntf_state(struct nfsd_net *nn, stateid_t *st,
5844 struct nfs4_client *clp,
5845 struct nfs4_cpntf_state **cps)
5846 {
5847 copy_stateid_t *cps_t;
5848 struct nfs4_cpntf_state *state = NULL;
5849
5850 if (st->si_opaque.so_clid.cl_id != nn->s2s_cp_cl_id)
5851 return nfserr_bad_stateid;
5852 spin_lock(&nn->s2s_cp_lock);
5853 cps_t = idr_find(&nn->s2s_cp_stateids, st->si_opaque.so_id);
5854 if (cps_t) {
5855 state = container_of(cps_t, struct nfs4_cpntf_state,
5856 cp_stateid);
5857 if (state->cp_stateid.sc_type != NFS4_COPYNOTIFY_STID) {
5858 state = NULL;
5859 goto unlock;
5860 }
5861 if (!clp)
5862 refcount_inc(&state->cp_stateid.sc_count);
5863 else
5864 _free_cpntf_state_locked(nn, state);
5865 }
5866 unlock:
5867 spin_unlock(&nn->s2s_cp_lock);
5868 if (!state)
5869 return nfserr_bad_stateid;
5870 if (!clp && state)
5871 *cps = state;
5872 return 0;
5873 }
5874
find_cpntf_state(struct nfsd_net * nn,stateid_t * st,struct nfs4_stid ** stid)5875 static __be32 find_cpntf_state(struct nfsd_net *nn, stateid_t *st,
5876 struct nfs4_stid **stid)
5877 {
5878 __be32 status;
5879 struct nfs4_cpntf_state *cps = NULL;
5880 struct nfs4_client *found;
5881
5882 status = manage_cpntf_state(nn, st, NULL, &cps);
5883 if (status)
5884 return status;
5885
5886 cps->cpntf_time = ktime_get_boottime_seconds();
5887
5888 status = nfserr_expired;
5889 found = lookup_clientid(&cps->cp_p_clid, true, nn);
5890 if (!found)
5891 goto out;
5892
5893 *stid = find_stateid_by_type(found, &cps->cp_p_stateid,
5894 NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID);
5895 if (*stid)
5896 status = nfs_ok;
5897 else
5898 status = nfserr_bad_stateid;
5899
5900 put_client_renew(found);
5901 out:
5902 nfs4_put_cpntf_state(nn, cps);
5903 return status;
5904 }
5905
nfs4_put_cpntf_state(struct nfsd_net * nn,struct nfs4_cpntf_state * cps)5906 void nfs4_put_cpntf_state(struct nfsd_net *nn, struct nfs4_cpntf_state *cps)
5907 {
5908 spin_lock(&nn->s2s_cp_lock);
5909 _free_cpntf_state_locked(nn, cps);
5910 spin_unlock(&nn->s2s_cp_lock);
5911 }
5912
5913 /*
5914 * Checks for stateid operations
5915 */
5916 __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)5917 nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
5918 struct nfsd4_compound_state *cstate, struct svc_fh *fhp,
5919 stateid_t *stateid, int flags, struct nfsd_file **nfp,
5920 struct nfs4_stid **cstid)
5921 {
5922 struct inode *ino = d_inode(fhp->fh_dentry);
5923 struct net *net = SVC_NET(rqstp);
5924 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5925 struct nfs4_stid *s = NULL;
5926 __be32 status;
5927
5928 if (nfp)
5929 *nfp = NULL;
5930
5931 if (grace_disallows_io(net, ino))
5932 return nfserr_grace;
5933
5934 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
5935 status = check_special_stateids(net, fhp, stateid, flags);
5936 goto done;
5937 }
5938
5939 status = nfsd4_lookup_stateid(cstate, stateid,
5940 NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID,
5941 &s, nn);
5942 if (status == nfserr_bad_stateid)
5943 status = find_cpntf_state(nn, stateid, &s);
5944 if (status)
5945 return status;
5946 status = nfsd4_stid_check_stateid_generation(stateid, s,
5947 nfsd4_has_session(cstate));
5948 if (status)
5949 goto out;
5950
5951 switch (s->sc_type) {
5952 case NFS4_DELEG_STID:
5953 status = nfs4_check_delegmode(delegstateid(s), flags);
5954 break;
5955 case NFS4_OPEN_STID:
5956 case NFS4_LOCK_STID:
5957 status = nfs4_check_olstateid(openlockstateid(s), flags);
5958 break;
5959 default:
5960 status = nfserr_bad_stateid;
5961 break;
5962 }
5963 if (status)
5964 goto out;
5965 status = nfs4_check_fh(fhp, s);
5966
5967 done:
5968 if (status == nfs_ok && nfp)
5969 status = nfs4_check_file(rqstp, fhp, s, nfp, flags);
5970 out:
5971 if (s) {
5972 if (!status && cstid)
5973 *cstid = s;
5974 else
5975 nfs4_put_stid(s);
5976 }
5977 return status;
5978 }
5979
5980 /*
5981 * Test if the stateid is valid
5982 */
5983 __be32
nfsd4_test_stateid(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)5984 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5985 union nfsd4_op_u *u)
5986 {
5987 struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
5988 struct nfsd4_test_stateid_id *stateid;
5989 struct nfs4_client *cl = cstate->clp;
5990
5991 list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
5992 stateid->ts_id_status =
5993 nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
5994
5995 return nfs_ok;
5996 }
5997
5998 static __be32
nfsd4_free_lock_stateid(stateid_t * stateid,struct nfs4_stid * s)5999 nfsd4_free_lock_stateid(stateid_t *stateid, struct nfs4_stid *s)
6000 {
6001 struct nfs4_ol_stateid *stp = openlockstateid(s);
6002 __be32 ret;
6003
6004 ret = nfsd4_lock_ol_stateid(stp);
6005 if (ret)
6006 goto out_put_stid;
6007
6008 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
6009 if (ret)
6010 goto out;
6011
6012 ret = nfserr_locks_held;
6013 if (check_for_locks(stp->st_stid.sc_file,
6014 lockowner(stp->st_stateowner)))
6015 goto out;
6016
6017 release_lock_stateid(stp);
6018 ret = nfs_ok;
6019
6020 out:
6021 mutex_unlock(&stp->st_mutex);
6022 out_put_stid:
6023 nfs4_put_stid(s);
6024 return ret;
6025 }
6026
6027 __be32
nfsd4_free_stateid(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)6028 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6029 union nfsd4_op_u *u)
6030 {
6031 struct nfsd4_free_stateid *free_stateid = &u->free_stateid;
6032 stateid_t *stateid = &free_stateid->fr_stateid;
6033 struct nfs4_stid *s;
6034 struct nfs4_delegation *dp;
6035 struct nfs4_client *cl = cstate->clp;
6036 __be32 ret = nfserr_bad_stateid;
6037
6038 spin_lock(&cl->cl_lock);
6039 s = find_stateid_locked(cl, stateid);
6040 if (!s)
6041 goto out_unlock;
6042 spin_lock(&s->sc_lock);
6043 switch (s->sc_type) {
6044 case NFS4_DELEG_STID:
6045 ret = nfserr_locks_held;
6046 break;
6047 case NFS4_OPEN_STID:
6048 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
6049 if (ret)
6050 break;
6051 ret = nfserr_locks_held;
6052 break;
6053 case NFS4_LOCK_STID:
6054 spin_unlock(&s->sc_lock);
6055 refcount_inc(&s->sc_count);
6056 spin_unlock(&cl->cl_lock);
6057 ret = nfsd4_free_lock_stateid(stateid, s);
6058 goto out;
6059 case NFS4_REVOKED_DELEG_STID:
6060 spin_unlock(&s->sc_lock);
6061 dp = delegstateid(s);
6062 list_del_init(&dp->dl_recall_lru);
6063 spin_unlock(&cl->cl_lock);
6064 nfs4_put_stid(s);
6065 ret = nfs_ok;
6066 goto out;
6067 /* Default falls through and returns nfserr_bad_stateid */
6068 }
6069 spin_unlock(&s->sc_lock);
6070 out_unlock:
6071 spin_unlock(&cl->cl_lock);
6072 out:
6073 return ret;
6074 }
6075
6076 static inline int
setlkflg(int type)6077 setlkflg (int type)
6078 {
6079 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
6080 RD_STATE : WR_STATE;
6081 }
6082
nfs4_seqid_op_checks(struct nfsd4_compound_state * cstate,stateid_t * stateid,u32 seqid,struct nfs4_ol_stateid * stp)6083 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
6084 {
6085 struct svc_fh *current_fh = &cstate->current_fh;
6086 struct nfs4_stateowner *sop = stp->st_stateowner;
6087 __be32 status;
6088
6089 status = nfsd4_check_seqid(cstate, sop, seqid);
6090 if (status)
6091 return status;
6092 status = nfsd4_lock_ol_stateid(stp);
6093 if (status != nfs_ok)
6094 return status;
6095 status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
6096 if (status == nfs_ok)
6097 status = nfs4_check_fh(current_fh, &stp->st_stid);
6098 if (status != nfs_ok)
6099 mutex_unlock(&stp->st_mutex);
6100 return status;
6101 }
6102
6103 /*
6104 * Checks for sequence id mutating operations.
6105 */
6106 static __be32
nfs4_preprocess_seqid_op(struct nfsd4_compound_state * cstate,u32 seqid,stateid_t * stateid,char typemask,struct nfs4_ol_stateid ** stpp,struct nfsd_net * nn)6107 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
6108 stateid_t *stateid, char typemask,
6109 struct nfs4_ol_stateid **stpp,
6110 struct nfsd_net *nn)
6111 {
6112 __be32 status;
6113 struct nfs4_stid *s;
6114 struct nfs4_ol_stateid *stp = NULL;
6115
6116 trace_nfsd_preprocess(seqid, stateid);
6117
6118 *stpp = NULL;
6119 status = nfsd4_lookup_stateid(cstate, stateid, typemask, &s, nn);
6120 if (status)
6121 return status;
6122 stp = openlockstateid(s);
6123 nfsd4_cstate_assign_replay(cstate, stp->st_stateowner);
6124
6125 status = nfs4_seqid_op_checks(cstate, stateid, seqid, stp);
6126 if (!status)
6127 *stpp = stp;
6128 else
6129 nfs4_put_stid(&stp->st_stid);
6130 return status;
6131 }
6132
nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state * cstate,u32 seqid,stateid_t * stateid,struct nfs4_ol_stateid ** stpp,struct nfsd_net * nn)6133 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
6134 stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
6135 {
6136 __be32 status;
6137 struct nfs4_openowner *oo;
6138 struct nfs4_ol_stateid *stp;
6139
6140 status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
6141 NFS4_OPEN_STID, &stp, nn);
6142 if (status)
6143 return status;
6144 oo = openowner(stp->st_stateowner);
6145 if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
6146 mutex_unlock(&stp->st_mutex);
6147 nfs4_put_stid(&stp->st_stid);
6148 return nfserr_bad_stateid;
6149 }
6150 *stpp = stp;
6151 return nfs_ok;
6152 }
6153
6154 __be32
nfsd4_open_confirm(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)6155 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6156 union nfsd4_op_u *u)
6157 {
6158 struct nfsd4_open_confirm *oc = &u->open_confirm;
6159 __be32 status;
6160 struct nfs4_openowner *oo;
6161 struct nfs4_ol_stateid *stp;
6162 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6163
6164 dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
6165 cstate->current_fh.fh_dentry);
6166
6167 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
6168 if (status)
6169 return status;
6170
6171 status = nfs4_preprocess_seqid_op(cstate,
6172 oc->oc_seqid, &oc->oc_req_stateid,
6173 NFS4_OPEN_STID, &stp, nn);
6174 if (status)
6175 goto out;
6176 oo = openowner(stp->st_stateowner);
6177 status = nfserr_bad_stateid;
6178 if (oo->oo_flags & NFS4_OO_CONFIRMED) {
6179 mutex_unlock(&stp->st_mutex);
6180 goto put_stateid;
6181 }
6182 oo->oo_flags |= NFS4_OO_CONFIRMED;
6183 nfs4_inc_and_copy_stateid(&oc->oc_resp_stateid, &stp->st_stid);
6184 mutex_unlock(&stp->st_mutex);
6185 trace_nfsd_open_confirm(oc->oc_seqid, &stp->st_stid.sc_stateid);
6186 nfsd4_client_record_create(oo->oo_owner.so_client);
6187 status = nfs_ok;
6188 put_stateid:
6189 nfs4_put_stid(&stp->st_stid);
6190 out:
6191 nfsd4_bump_seqid(cstate, status);
6192 return status;
6193 }
6194
nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid * stp,u32 access)6195 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
6196 {
6197 if (!test_access(access, stp))
6198 return;
6199 nfs4_file_put_access(stp->st_stid.sc_file, access);
6200 clear_access(access, stp);
6201 }
6202
nfs4_stateid_downgrade(struct nfs4_ol_stateid * stp,u32 to_access)6203 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
6204 {
6205 switch (to_access) {
6206 case NFS4_SHARE_ACCESS_READ:
6207 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
6208 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
6209 break;
6210 case NFS4_SHARE_ACCESS_WRITE:
6211 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
6212 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
6213 break;
6214 case NFS4_SHARE_ACCESS_BOTH:
6215 break;
6216 default:
6217 WARN_ON_ONCE(1);
6218 }
6219 }
6220
6221 __be32
nfsd4_open_downgrade(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)6222 nfsd4_open_downgrade(struct svc_rqst *rqstp,
6223 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
6224 {
6225 struct nfsd4_open_downgrade *od = &u->open_downgrade;
6226 __be32 status;
6227 struct nfs4_ol_stateid *stp;
6228 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6229
6230 dprintk("NFSD: nfsd4_open_downgrade on file %pd\n",
6231 cstate->current_fh.fh_dentry);
6232
6233 /* We don't yet support WANT bits: */
6234 if (od->od_deleg_want)
6235 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
6236 od->od_deleg_want);
6237
6238 status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
6239 &od->od_stateid, &stp, nn);
6240 if (status)
6241 goto out;
6242 status = nfserr_inval;
6243 if (!test_access(od->od_share_access, stp)) {
6244 dprintk("NFSD: access not a subset of current bitmap: 0x%hhx, input access=%08x\n",
6245 stp->st_access_bmap, od->od_share_access);
6246 goto put_stateid;
6247 }
6248 if (!test_deny(od->od_share_deny, stp)) {
6249 dprintk("NFSD: deny not a subset of current bitmap: 0x%hhx, input deny=%08x\n",
6250 stp->st_deny_bmap, od->od_share_deny);
6251 goto put_stateid;
6252 }
6253 nfs4_stateid_downgrade(stp, od->od_share_access);
6254 reset_union_bmap_deny(od->od_share_deny, stp);
6255 nfs4_inc_and_copy_stateid(&od->od_stateid, &stp->st_stid);
6256 status = nfs_ok;
6257 put_stateid:
6258 mutex_unlock(&stp->st_mutex);
6259 nfs4_put_stid(&stp->st_stid);
6260 out:
6261 nfsd4_bump_seqid(cstate, status);
6262 return status;
6263 }
6264
nfsd4_close_open_stateid(struct nfs4_ol_stateid * s)6265 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
6266 {
6267 struct nfs4_client *clp = s->st_stid.sc_client;
6268 bool unhashed;
6269 LIST_HEAD(reaplist);
6270
6271 spin_lock(&clp->cl_lock);
6272 unhashed = unhash_open_stateid(s, &reaplist);
6273
6274 if (clp->cl_minorversion) {
6275 if (unhashed)
6276 put_ol_stateid_locked(s, &reaplist);
6277 spin_unlock(&clp->cl_lock);
6278 free_ol_stateid_reaplist(&reaplist);
6279 } else {
6280 spin_unlock(&clp->cl_lock);
6281 free_ol_stateid_reaplist(&reaplist);
6282 if (unhashed)
6283 move_to_close_lru(s, clp->net);
6284 }
6285 }
6286
6287 /*
6288 * nfs4_unlock_state() called after encode
6289 */
6290 __be32
nfsd4_close(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)6291 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6292 union nfsd4_op_u *u)
6293 {
6294 struct nfsd4_close *close = &u->close;
6295 __be32 status;
6296 struct nfs4_ol_stateid *stp;
6297 struct net *net = SVC_NET(rqstp);
6298 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
6299
6300 dprintk("NFSD: nfsd4_close on file %pd\n",
6301 cstate->current_fh.fh_dentry);
6302
6303 status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
6304 &close->cl_stateid,
6305 NFS4_OPEN_STID|NFS4_CLOSED_STID,
6306 &stp, nn);
6307 nfsd4_bump_seqid(cstate, status);
6308 if (status)
6309 goto out;
6310
6311 stp->st_stid.sc_type = NFS4_CLOSED_STID;
6312
6313 /*
6314 * Technically we don't _really_ have to increment or copy it, since
6315 * it should just be gone after this operation and we clobber the
6316 * copied value below, but we continue to do so here just to ensure
6317 * that racing ops see that there was a state change.
6318 */
6319 nfs4_inc_and_copy_stateid(&close->cl_stateid, &stp->st_stid);
6320
6321 nfsd4_close_open_stateid(stp);
6322 mutex_unlock(&stp->st_mutex);
6323
6324 /* v4.1+ suggests that we send a special stateid in here, since the
6325 * clients should just ignore this anyway. Since this is not useful
6326 * for v4.0 clients either, we set it to the special close_stateid
6327 * universally.
6328 *
6329 * See RFC5661 section 18.2.4, and RFC7530 section 16.2.5
6330 */
6331 memcpy(&close->cl_stateid, &close_stateid, sizeof(close->cl_stateid));
6332
6333 /* put reference from nfs4_preprocess_seqid_op */
6334 nfs4_put_stid(&stp->st_stid);
6335 out:
6336 return status;
6337 }
6338
6339 __be32
nfsd4_delegreturn(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)6340 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6341 union nfsd4_op_u *u)
6342 {
6343 struct nfsd4_delegreturn *dr = &u->delegreturn;
6344 struct nfs4_delegation *dp;
6345 stateid_t *stateid = &dr->dr_stateid;
6346 struct nfs4_stid *s;
6347 __be32 status;
6348 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6349
6350 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
6351 return status;
6352
6353 status = nfsd4_lookup_stateid(cstate, stateid, NFS4_DELEG_STID, &s, nn);
6354 if (status)
6355 goto out;
6356 dp = delegstateid(s);
6357 status = nfsd4_stid_check_stateid_generation(stateid, &dp->dl_stid, nfsd4_has_session(cstate));
6358 if (status)
6359 goto put_stateid;
6360
6361 destroy_delegation(dp);
6362 put_stateid:
6363 nfs4_put_stid(&dp->dl_stid);
6364 out:
6365 return status;
6366 }
6367
6368 /* last octet in a range */
6369 static inline u64
last_byte_offset(u64 start,u64 len)6370 last_byte_offset(u64 start, u64 len)
6371 {
6372 u64 end;
6373
6374 WARN_ON_ONCE(!len);
6375 end = start + len;
6376 return end > start ? end - 1: NFS4_MAX_UINT64;
6377 }
6378
6379 /*
6380 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
6381 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
6382 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
6383 * locking, this prevents us from being completely protocol-compliant. The
6384 * real solution to this problem is to start using unsigned file offsets in
6385 * the VFS, but this is a very deep change!
6386 */
6387 static inline void
nfs4_transform_lock_offset(struct file_lock * lock)6388 nfs4_transform_lock_offset(struct file_lock *lock)
6389 {
6390 if (lock->fl_start < 0)
6391 lock->fl_start = OFFSET_MAX;
6392 if (lock->fl_end < 0)
6393 lock->fl_end = OFFSET_MAX;
6394 }
6395
6396 static fl_owner_t
nfsd4_fl_get_owner(fl_owner_t owner)6397 nfsd4_fl_get_owner(fl_owner_t owner)
6398 {
6399 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
6400
6401 nfs4_get_stateowner(&lo->lo_owner);
6402 return owner;
6403 }
6404
6405 static void
nfsd4_fl_put_owner(fl_owner_t owner)6406 nfsd4_fl_put_owner(fl_owner_t owner)
6407 {
6408 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
6409
6410 if (lo)
6411 nfs4_put_stateowner(&lo->lo_owner);
6412 }
6413
6414 static void
nfsd4_lm_notify(struct file_lock * fl)6415 nfsd4_lm_notify(struct file_lock *fl)
6416 {
6417 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)fl->fl_owner;
6418 struct net *net = lo->lo_owner.so_client->net;
6419 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
6420 struct nfsd4_blocked_lock *nbl = container_of(fl,
6421 struct nfsd4_blocked_lock, nbl_lock);
6422 bool queue = false;
6423
6424 /* An empty list means that something else is going to be using it */
6425 spin_lock(&nn->blocked_locks_lock);
6426 if (!list_empty(&nbl->nbl_list)) {
6427 list_del_init(&nbl->nbl_list);
6428 list_del_init(&nbl->nbl_lru);
6429 queue = true;
6430 }
6431 spin_unlock(&nn->blocked_locks_lock);
6432
6433 if (queue)
6434 nfsd4_run_cb(&nbl->nbl_cb);
6435 }
6436
6437 static const struct lock_manager_operations nfsd_posix_mng_ops = {
6438 .lm_notify = nfsd4_lm_notify,
6439 .lm_get_owner = nfsd4_fl_get_owner,
6440 .lm_put_owner = nfsd4_fl_put_owner,
6441 };
6442
6443 static inline void
nfs4_set_lock_denied(struct file_lock * fl,struct nfsd4_lock_denied * deny)6444 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
6445 {
6446 struct nfs4_lockowner *lo;
6447
6448 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
6449 lo = (struct nfs4_lockowner *) fl->fl_owner;
6450 xdr_netobj_dup(&deny->ld_owner, &lo->lo_owner.so_owner,
6451 GFP_KERNEL);
6452 if (!deny->ld_owner.data)
6453 /* We just don't care that much */
6454 goto nevermind;
6455 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
6456 } else {
6457 nevermind:
6458 deny->ld_owner.len = 0;
6459 deny->ld_owner.data = NULL;
6460 deny->ld_clientid.cl_boot = 0;
6461 deny->ld_clientid.cl_id = 0;
6462 }
6463 deny->ld_start = fl->fl_start;
6464 deny->ld_length = NFS4_MAX_UINT64;
6465 if (fl->fl_end != NFS4_MAX_UINT64)
6466 deny->ld_length = fl->fl_end - fl->fl_start + 1;
6467 deny->ld_type = NFS4_READ_LT;
6468 if (fl->fl_type != F_RDLCK)
6469 deny->ld_type = NFS4_WRITE_LT;
6470 }
6471
6472 static struct nfs4_lockowner *
find_lockowner_str_locked(struct nfs4_client * clp,struct xdr_netobj * owner)6473 find_lockowner_str_locked(struct nfs4_client *clp, struct xdr_netobj *owner)
6474 {
6475 unsigned int strhashval = ownerstr_hashval(owner);
6476 struct nfs4_stateowner *so;
6477
6478 lockdep_assert_held(&clp->cl_lock);
6479
6480 list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[strhashval],
6481 so_strhash) {
6482 if (so->so_is_open_owner)
6483 continue;
6484 if (same_owner_str(so, owner))
6485 return lockowner(nfs4_get_stateowner(so));
6486 }
6487 return NULL;
6488 }
6489
6490 static struct nfs4_lockowner *
find_lockowner_str(struct nfs4_client * clp,struct xdr_netobj * owner)6491 find_lockowner_str(struct nfs4_client *clp, struct xdr_netobj *owner)
6492 {
6493 struct nfs4_lockowner *lo;
6494
6495 spin_lock(&clp->cl_lock);
6496 lo = find_lockowner_str_locked(clp, owner);
6497 spin_unlock(&clp->cl_lock);
6498 return lo;
6499 }
6500
nfs4_unhash_lockowner(struct nfs4_stateowner * sop)6501 static void nfs4_unhash_lockowner(struct nfs4_stateowner *sop)
6502 {
6503 unhash_lockowner_locked(lockowner(sop));
6504 }
6505
nfs4_free_lockowner(struct nfs4_stateowner * sop)6506 static void nfs4_free_lockowner(struct nfs4_stateowner *sop)
6507 {
6508 struct nfs4_lockowner *lo = lockowner(sop);
6509
6510 kmem_cache_free(lockowner_slab, lo);
6511 }
6512
6513 static const struct nfs4_stateowner_operations lockowner_ops = {
6514 .so_unhash = nfs4_unhash_lockowner,
6515 .so_free = nfs4_free_lockowner,
6516 };
6517
6518 /*
6519 * Alloc a lock owner structure.
6520 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
6521 * occurred.
6522 *
6523 * strhashval = ownerstr_hashval
6524 */
6525 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)6526 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp,
6527 struct nfs4_ol_stateid *open_stp,
6528 struct nfsd4_lock *lock)
6529 {
6530 struct nfs4_lockowner *lo, *ret;
6531
6532 lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
6533 if (!lo)
6534 return NULL;
6535 INIT_LIST_HEAD(&lo->lo_blocked);
6536 INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
6537 lo->lo_owner.so_is_open_owner = 0;
6538 lo->lo_owner.so_seqid = lock->lk_new_lock_seqid;
6539 lo->lo_owner.so_ops = &lockowner_ops;
6540 spin_lock(&clp->cl_lock);
6541 ret = find_lockowner_str_locked(clp, &lock->lk_new_owner);
6542 if (ret == NULL) {
6543 list_add(&lo->lo_owner.so_strhash,
6544 &clp->cl_ownerstr_hashtbl[strhashval]);
6545 ret = lo;
6546 } else
6547 nfs4_free_stateowner(&lo->lo_owner);
6548
6549 spin_unlock(&clp->cl_lock);
6550 return ret;
6551 }
6552
6553 static struct nfs4_ol_stateid *
find_lock_stateid(const struct nfs4_lockowner * lo,const struct nfs4_ol_stateid * ost)6554 find_lock_stateid(const struct nfs4_lockowner *lo,
6555 const struct nfs4_ol_stateid *ost)
6556 {
6557 struct nfs4_ol_stateid *lst;
6558
6559 lockdep_assert_held(&ost->st_stid.sc_client->cl_lock);
6560
6561 /* If ost is not hashed, ost->st_locks will not be valid */
6562 if (!nfs4_ol_stateid_unhashed(ost))
6563 list_for_each_entry(lst, &ost->st_locks, st_locks) {
6564 if (lst->st_stateowner == &lo->lo_owner) {
6565 refcount_inc(&lst->st_stid.sc_count);
6566 return lst;
6567 }
6568 }
6569 return NULL;
6570 }
6571
6572 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)6573 init_lock_stateid(struct nfs4_ol_stateid *stp, struct nfs4_lockowner *lo,
6574 struct nfs4_file *fp, struct inode *inode,
6575 struct nfs4_ol_stateid *open_stp)
6576 {
6577 struct nfs4_client *clp = lo->lo_owner.so_client;
6578 struct nfs4_ol_stateid *retstp;
6579
6580 mutex_init(&stp->st_mutex);
6581 mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX);
6582 retry:
6583 spin_lock(&clp->cl_lock);
6584 if (nfs4_ol_stateid_unhashed(open_stp))
6585 goto out_close;
6586 retstp = find_lock_stateid(lo, open_stp);
6587 if (retstp)
6588 goto out_found;
6589 refcount_inc(&stp->st_stid.sc_count);
6590 stp->st_stid.sc_type = NFS4_LOCK_STID;
6591 stp->st_stateowner = nfs4_get_stateowner(&lo->lo_owner);
6592 get_nfs4_file(fp);
6593 stp->st_stid.sc_file = fp;
6594 stp->st_access_bmap = 0;
6595 stp->st_deny_bmap = open_stp->st_deny_bmap;
6596 stp->st_openstp = open_stp;
6597 spin_lock(&fp->fi_lock);
6598 list_add(&stp->st_locks, &open_stp->st_locks);
6599 list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
6600 list_add(&stp->st_perfile, &fp->fi_stateids);
6601 spin_unlock(&fp->fi_lock);
6602 spin_unlock(&clp->cl_lock);
6603 return stp;
6604 out_found:
6605 spin_unlock(&clp->cl_lock);
6606 if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
6607 nfs4_put_stid(&retstp->st_stid);
6608 goto retry;
6609 }
6610 /* To keep mutex tracking happy */
6611 mutex_unlock(&stp->st_mutex);
6612 return retstp;
6613 out_close:
6614 spin_unlock(&clp->cl_lock);
6615 mutex_unlock(&stp->st_mutex);
6616 return NULL;
6617 }
6618
6619 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)6620 find_or_create_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fi,
6621 struct inode *inode, struct nfs4_ol_stateid *ost,
6622 bool *new)
6623 {
6624 struct nfs4_stid *ns = NULL;
6625 struct nfs4_ol_stateid *lst;
6626 struct nfs4_openowner *oo = openowner(ost->st_stateowner);
6627 struct nfs4_client *clp = oo->oo_owner.so_client;
6628
6629 *new = false;
6630 spin_lock(&clp->cl_lock);
6631 lst = find_lock_stateid(lo, ost);
6632 spin_unlock(&clp->cl_lock);
6633 if (lst != NULL) {
6634 if (nfsd4_lock_ol_stateid(lst) == nfs_ok)
6635 goto out;
6636 nfs4_put_stid(&lst->st_stid);
6637 }
6638 ns = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_lock_stateid);
6639 if (ns == NULL)
6640 return NULL;
6641
6642 lst = init_lock_stateid(openlockstateid(ns), lo, fi, inode, ost);
6643 if (lst == openlockstateid(ns))
6644 *new = true;
6645 else
6646 nfs4_put_stid(ns);
6647 out:
6648 return lst;
6649 }
6650
6651 static int
check_lock_length(u64 offset,u64 length)6652 check_lock_length(u64 offset, u64 length)
6653 {
6654 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
6655 (length > ~offset)));
6656 }
6657
get_lock_access(struct nfs4_ol_stateid * lock_stp,u32 access)6658 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
6659 {
6660 struct nfs4_file *fp = lock_stp->st_stid.sc_file;
6661
6662 lockdep_assert_held(&fp->fi_lock);
6663
6664 if (test_access(access, lock_stp))
6665 return;
6666 __nfs4_file_get_access(fp, access);
6667 set_access(access, lock_stp);
6668 }
6669
6670 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)6671 lookup_or_create_lock_state(struct nfsd4_compound_state *cstate,
6672 struct nfs4_ol_stateid *ost,
6673 struct nfsd4_lock *lock,
6674 struct nfs4_ol_stateid **plst, bool *new)
6675 {
6676 __be32 status;
6677 struct nfs4_file *fi = ost->st_stid.sc_file;
6678 struct nfs4_openowner *oo = openowner(ost->st_stateowner);
6679 struct nfs4_client *cl = oo->oo_owner.so_client;
6680 struct inode *inode = d_inode(cstate->current_fh.fh_dentry);
6681 struct nfs4_lockowner *lo;
6682 struct nfs4_ol_stateid *lst;
6683 unsigned int strhashval;
6684
6685 lo = find_lockowner_str(cl, &lock->lk_new_owner);
6686 if (!lo) {
6687 strhashval = ownerstr_hashval(&lock->lk_new_owner);
6688 lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
6689 if (lo == NULL)
6690 return nfserr_jukebox;
6691 } else {
6692 /* with an existing lockowner, seqids must be the same */
6693 status = nfserr_bad_seqid;
6694 if (!cstate->minorversion &&
6695 lock->lk_new_lock_seqid != lo->lo_owner.so_seqid)
6696 goto out;
6697 }
6698
6699 lst = find_or_create_lock_stateid(lo, fi, inode, ost, new);
6700 if (lst == NULL) {
6701 status = nfserr_jukebox;
6702 goto out;
6703 }
6704
6705 status = nfs_ok;
6706 *plst = lst;
6707 out:
6708 nfs4_put_stateowner(&lo->lo_owner);
6709 return status;
6710 }
6711
6712 /*
6713 * LOCK operation
6714 */
6715 __be32
nfsd4_lock(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)6716 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6717 union nfsd4_op_u *u)
6718 {
6719 struct nfsd4_lock *lock = &u->lock;
6720 struct nfs4_openowner *open_sop = NULL;
6721 struct nfs4_lockowner *lock_sop = NULL;
6722 struct nfs4_ol_stateid *lock_stp = NULL;
6723 struct nfs4_ol_stateid *open_stp = NULL;
6724 struct nfs4_file *fp;
6725 struct nfsd_file *nf = NULL;
6726 struct nfsd4_blocked_lock *nbl = NULL;
6727 struct file_lock *file_lock = NULL;
6728 struct file_lock *conflock = NULL;
6729 __be32 status = 0;
6730 int lkflg;
6731 int err;
6732 bool new = false;
6733 unsigned char fl_type;
6734 unsigned int fl_flags = FL_POSIX;
6735 struct net *net = SVC_NET(rqstp);
6736 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
6737
6738 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
6739 (long long) lock->lk_offset,
6740 (long long) lock->lk_length);
6741
6742 if (check_lock_length(lock->lk_offset, lock->lk_length))
6743 return nfserr_inval;
6744
6745 if ((status = fh_verify(rqstp, &cstate->current_fh,
6746 S_IFREG, NFSD_MAY_LOCK))) {
6747 dprintk("NFSD: nfsd4_lock: permission denied!\n");
6748 return status;
6749 }
6750
6751 if (lock->lk_is_new) {
6752 if (nfsd4_has_session(cstate))
6753 /* See rfc 5661 18.10.3: given clientid is ignored: */
6754 memcpy(&lock->lk_new_clientid,
6755 &cstate->clp->cl_clientid,
6756 sizeof(clientid_t));
6757
6758 /* validate and update open stateid and open seqid */
6759 status = nfs4_preprocess_confirmed_seqid_op(cstate,
6760 lock->lk_new_open_seqid,
6761 &lock->lk_new_open_stateid,
6762 &open_stp, nn);
6763 if (status)
6764 goto out;
6765 mutex_unlock(&open_stp->st_mutex);
6766 open_sop = openowner(open_stp->st_stateowner);
6767 status = nfserr_bad_stateid;
6768 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
6769 &lock->lk_new_clientid))
6770 goto out;
6771 status = lookup_or_create_lock_state(cstate, open_stp, lock,
6772 &lock_stp, &new);
6773 } else {
6774 status = nfs4_preprocess_seqid_op(cstate,
6775 lock->lk_old_lock_seqid,
6776 &lock->lk_old_lock_stateid,
6777 NFS4_LOCK_STID, &lock_stp, nn);
6778 }
6779 if (status)
6780 goto out;
6781 lock_sop = lockowner(lock_stp->st_stateowner);
6782
6783 lkflg = setlkflg(lock->lk_type);
6784 status = nfs4_check_openmode(lock_stp, lkflg);
6785 if (status)
6786 goto out;
6787
6788 status = nfserr_grace;
6789 if (locks_in_grace(net) && !lock->lk_reclaim)
6790 goto out;
6791 status = nfserr_no_grace;
6792 if (!locks_in_grace(net) && lock->lk_reclaim)
6793 goto out;
6794
6795 fp = lock_stp->st_stid.sc_file;
6796 switch (lock->lk_type) {
6797 case NFS4_READW_LT:
6798 if (nfsd4_has_session(cstate))
6799 fl_flags |= FL_SLEEP;
6800 fallthrough;
6801 case NFS4_READ_LT:
6802 spin_lock(&fp->fi_lock);
6803 nf = find_readable_file_locked(fp);
6804 if (nf)
6805 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
6806 spin_unlock(&fp->fi_lock);
6807 fl_type = F_RDLCK;
6808 break;
6809 case NFS4_WRITEW_LT:
6810 if (nfsd4_has_session(cstate))
6811 fl_flags |= FL_SLEEP;
6812 fallthrough;
6813 case NFS4_WRITE_LT:
6814 spin_lock(&fp->fi_lock);
6815 nf = find_writeable_file_locked(fp);
6816 if (nf)
6817 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
6818 spin_unlock(&fp->fi_lock);
6819 fl_type = F_WRLCK;
6820 break;
6821 default:
6822 status = nfserr_inval;
6823 goto out;
6824 }
6825
6826 if (!nf) {
6827 status = nfserr_openmode;
6828 goto out;
6829 }
6830
6831 nbl = find_or_allocate_block(lock_sop, &fp->fi_fhandle, nn);
6832 if (!nbl) {
6833 dprintk("NFSD: %s: unable to allocate block!\n", __func__);
6834 status = nfserr_jukebox;
6835 goto out;
6836 }
6837
6838 file_lock = &nbl->nbl_lock;
6839 file_lock->fl_type = fl_type;
6840 file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(&lock_sop->lo_owner));
6841 file_lock->fl_pid = current->tgid;
6842 file_lock->fl_file = nf->nf_file;
6843 file_lock->fl_flags = fl_flags;
6844 file_lock->fl_lmops = &nfsd_posix_mng_ops;
6845 file_lock->fl_start = lock->lk_offset;
6846 file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
6847 nfs4_transform_lock_offset(file_lock);
6848
6849 conflock = locks_alloc_lock();
6850 if (!conflock) {
6851 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
6852 status = nfserr_jukebox;
6853 goto out;
6854 }
6855
6856 if (fl_flags & FL_SLEEP) {
6857 nbl->nbl_time = ktime_get_boottime_seconds();
6858 spin_lock(&nn->blocked_locks_lock);
6859 list_add_tail(&nbl->nbl_list, &lock_sop->lo_blocked);
6860 list_add_tail(&nbl->nbl_lru, &nn->blocked_locks_lru);
6861 spin_unlock(&nn->blocked_locks_lock);
6862 }
6863
6864 err = vfs_lock_file(nf->nf_file, F_SETLK, file_lock, conflock);
6865 switch (err) {
6866 case 0: /* success! */
6867 nfs4_inc_and_copy_stateid(&lock->lk_resp_stateid, &lock_stp->st_stid);
6868 status = 0;
6869 if (lock->lk_reclaim)
6870 nn->somebody_reclaimed = true;
6871 break;
6872 case FILE_LOCK_DEFERRED:
6873 nbl = NULL;
6874 fallthrough;
6875 case -EAGAIN: /* conflock holds conflicting lock */
6876 status = nfserr_denied;
6877 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
6878 nfs4_set_lock_denied(conflock, &lock->lk_denied);
6879 break;
6880 case -EDEADLK:
6881 status = nfserr_deadlock;
6882 break;
6883 default:
6884 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
6885 status = nfserrno(err);
6886 break;
6887 }
6888 out:
6889 if (nbl) {
6890 /* dequeue it if we queued it before */
6891 if (fl_flags & FL_SLEEP) {
6892 spin_lock(&nn->blocked_locks_lock);
6893 list_del_init(&nbl->nbl_list);
6894 list_del_init(&nbl->nbl_lru);
6895 spin_unlock(&nn->blocked_locks_lock);
6896 }
6897 free_blocked_lock(nbl);
6898 }
6899 if (nf)
6900 nfsd_file_put(nf);
6901 if (lock_stp) {
6902 /* Bump seqid manually if the 4.0 replay owner is openowner */
6903 if (cstate->replay_owner &&
6904 cstate->replay_owner != &lock_sop->lo_owner &&
6905 seqid_mutating_err(ntohl(status)))
6906 lock_sop->lo_owner.so_seqid++;
6907
6908 /*
6909 * If this is a new, never-before-used stateid, and we are
6910 * returning an error, then just go ahead and release it.
6911 */
6912 if (status && new)
6913 release_lock_stateid(lock_stp);
6914
6915 mutex_unlock(&lock_stp->st_mutex);
6916
6917 nfs4_put_stid(&lock_stp->st_stid);
6918 }
6919 if (open_stp)
6920 nfs4_put_stid(&open_stp->st_stid);
6921 nfsd4_bump_seqid(cstate, status);
6922 if (conflock)
6923 locks_free_lock(conflock);
6924 return status;
6925 }
6926
6927 /*
6928 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
6929 * so we do a temporary open here just to get an open file to pass to
6930 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
6931 * inode operation.)
6932 */
nfsd_test_lock(struct svc_rqst * rqstp,struct svc_fh * fhp,struct file_lock * lock)6933 static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
6934 {
6935 struct nfsd_file *nf;
6936 __be32 err;
6937
6938 err = nfsd_file_acquire(rqstp, fhp, NFSD_MAY_READ, &nf);
6939 if (err)
6940 return err;
6941 fh_lock(fhp); /* to block new leases till after test_lock: */
6942 err = nfserrno(nfsd_open_break_lease(fhp->fh_dentry->d_inode,
6943 NFSD_MAY_READ));
6944 if (err)
6945 goto out;
6946 err = nfserrno(vfs_test_lock(nf->nf_file, lock));
6947 out:
6948 fh_unlock(fhp);
6949 nfsd_file_put(nf);
6950 return err;
6951 }
6952
6953 /*
6954 * LOCKT operation
6955 */
6956 __be32
nfsd4_lockt(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)6957 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6958 union nfsd4_op_u *u)
6959 {
6960 struct nfsd4_lockt *lockt = &u->lockt;
6961 struct file_lock *file_lock = NULL;
6962 struct nfs4_lockowner *lo = NULL;
6963 __be32 status;
6964 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6965
6966 if (locks_in_grace(SVC_NET(rqstp)))
6967 return nfserr_grace;
6968
6969 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
6970 return nfserr_inval;
6971
6972 if (!nfsd4_has_session(cstate)) {
6973 status = set_client(&lockt->lt_clientid, cstate, nn);
6974 if (status)
6975 goto out;
6976 }
6977
6978 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
6979 goto out;
6980
6981 file_lock = locks_alloc_lock();
6982 if (!file_lock) {
6983 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
6984 status = nfserr_jukebox;
6985 goto out;
6986 }
6987
6988 switch (lockt->lt_type) {
6989 case NFS4_READ_LT:
6990 case NFS4_READW_LT:
6991 file_lock->fl_type = F_RDLCK;
6992 break;
6993 case NFS4_WRITE_LT:
6994 case NFS4_WRITEW_LT:
6995 file_lock->fl_type = F_WRLCK;
6996 break;
6997 default:
6998 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
6999 status = nfserr_inval;
7000 goto out;
7001 }
7002
7003 lo = find_lockowner_str(cstate->clp, &lockt->lt_owner);
7004 if (lo)
7005 file_lock->fl_owner = (fl_owner_t)lo;
7006 file_lock->fl_pid = current->tgid;
7007 file_lock->fl_flags = FL_POSIX;
7008
7009 file_lock->fl_start = lockt->lt_offset;
7010 file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
7011
7012 nfs4_transform_lock_offset(file_lock);
7013
7014 status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
7015 if (status)
7016 goto out;
7017
7018 if (file_lock->fl_type != F_UNLCK) {
7019 status = nfserr_denied;
7020 nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
7021 }
7022 out:
7023 if (lo)
7024 nfs4_put_stateowner(&lo->lo_owner);
7025 if (file_lock)
7026 locks_free_lock(file_lock);
7027 return status;
7028 }
7029
7030 __be32
nfsd4_locku(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7031 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7032 union nfsd4_op_u *u)
7033 {
7034 struct nfsd4_locku *locku = &u->locku;
7035 struct nfs4_ol_stateid *stp;
7036 struct nfsd_file *nf = NULL;
7037 struct file_lock *file_lock = NULL;
7038 __be32 status;
7039 int err;
7040 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
7041
7042 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
7043 (long long) locku->lu_offset,
7044 (long long) locku->lu_length);
7045
7046 if (check_lock_length(locku->lu_offset, locku->lu_length))
7047 return nfserr_inval;
7048
7049 status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
7050 &locku->lu_stateid, NFS4_LOCK_STID,
7051 &stp, nn);
7052 if (status)
7053 goto out;
7054 nf = find_any_file(stp->st_stid.sc_file);
7055 if (!nf) {
7056 status = nfserr_lock_range;
7057 goto put_stateid;
7058 }
7059 file_lock = locks_alloc_lock();
7060 if (!file_lock) {
7061 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
7062 status = nfserr_jukebox;
7063 goto put_file;
7064 }
7065
7066 file_lock->fl_type = F_UNLCK;
7067 file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(stp->st_stateowner));
7068 file_lock->fl_pid = current->tgid;
7069 file_lock->fl_file = nf->nf_file;
7070 file_lock->fl_flags = FL_POSIX;
7071 file_lock->fl_lmops = &nfsd_posix_mng_ops;
7072 file_lock->fl_start = locku->lu_offset;
7073
7074 file_lock->fl_end = last_byte_offset(locku->lu_offset,
7075 locku->lu_length);
7076 nfs4_transform_lock_offset(file_lock);
7077
7078 err = vfs_lock_file(nf->nf_file, F_SETLK, file_lock, NULL);
7079 if (err) {
7080 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
7081 goto out_nfserr;
7082 }
7083 nfs4_inc_and_copy_stateid(&locku->lu_stateid, &stp->st_stid);
7084 put_file:
7085 nfsd_file_put(nf);
7086 put_stateid:
7087 mutex_unlock(&stp->st_mutex);
7088 nfs4_put_stid(&stp->st_stid);
7089 out:
7090 nfsd4_bump_seqid(cstate, status);
7091 if (file_lock)
7092 locks_free_lock(file_lock);
7093 return status;
7094
7095 out_nfserr:
7096 status = nfserrno(err);
7097 goto put_file;
7098 }
7099
7100 /*
7101 * returns
7102 * true: locks held by lockowner
7103 * false: no locks held by lockowner
7104 */
7105 static bool
check_for_locks(struct nfs4_file * fp,struct nfs4_lockowner * lowner)7106 check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner)
7107 {
7108 struct file_lock *fl;
7109 int status = false;
7110 struct nfsd_file *nf = find_any_file(fp);
7111 struct inode *inode;
7112 struct file_lock_context *flctx;
7113
7114 if (!nf) {
7115 /* Any valid lock stateid should have some sort of access */
7116 WARN_ON_ONCE(1);
7117 return status;
7118 }
7119
7120 inode = locks_inode(nf->nf_file);
7121 flctx = inode->i_flctx;
7122
7123 if (flctx && !list_empty_careful(&flctx->flc_posix)) {
7124 spin_lock(&flctx->flc_lock);
7125 list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
7126 if (fl->fl_owner == (fl_owner_t)lowner) {
7127 status = true;
7128 break;
7129 }
7130 }
7131 spin_unlock(&flctx->flc_lock);
7132 }
7133 nfsd_file_put(nf);
7134 return status;
7135 }
7136
7137 __be32
nfsd4_release_lockowner(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7138 nfsd4_release_lockowner(struct svc_rqst *rqstp,
7139 struct nfsd4_compound_state *cstate,
7140 union nfsd4_op_u *u)
7141 {
7142 struct nfsd4_release_lockowner *rlockowner = &u->release_lockowner;
7143 clientid_t *clid = &rlockowner->rl_clientid;
7144 struct nfs4_stateowner *sop;
7145 struct nfs4_lockowner *lo = NULL;
7146 struct nfs4_ol_stateid *stp;
7147 struct xdr_netobj *owner = &rlockowner->rl_owner;
7148 unsigned int hashval = ownerstr_hashval(owner);
7149 __be32 status;
7150 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
7151 struct nfs4_client *clp;
7152 LIST_HEAD (reaplist);
7153
7154 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
7155 clid->cl_boot, clid->cl_id);
7156
7157 status = set_client(clid, cstate, nn);
7158 if (status)
7159 return status;
7160
7161 clp = cstate->clp;
7162 /* Find the matching lock stateowner */
7163 spin_lock(&clp->cl_lock);
7164 list_for_each_entry(sop, &clp->cl_ownerstr_hashtbl[hashval],
7165 so_strhash) {
7166
7167 if (sop->so_is_open_owner || !same_owner_str(sop, owner))
7168 continue;
7169
7170 /* see if there are still any locks associated with it */
7171 lo = lockowner(sop);
7172 list_for_each_entry(stp, &sop->so_stateids, st_perstateowner) {
7173 if (check_for_locks(stp->st_stid.sc_file, lo)) {
7174 status = nfserr_locks_held;
7175 spin_unlock(&clp->cl_lock);
7176 return status;
7177 }
7178 }
7179
7180 nfs4_get_stateowner(sop);
7181 break;
7182 }
7183 if (!lo) {
7184 spin_unlock(&clp->cl_lock);
7185 return status;
7186 }
7187
7188 unhash_lockowner_locked(lo);
7189 while (!list_empty(&lo->lo_owner.so_stateids)) {
7190 stp = list_first_entry(&lo->lo_owner.so_stateids,
7191 struct nfs4_ol_stateid,
7192 st_perstateowner);
7193 WARN_ON(!unhash_lock_stateid(stp));
7194 put_ol_stateid_locked(stp, &reaplist);
7195 }
7196 spin_unlock(&clp->cl_lock);
7197 free_ol_stateid_reaplist(&reaplist);
7198 remove_blocked_locks(lo);
7199 nfs4_put_stateowner(&lo->lo_owner);
7200
7201 return status;
7202 }
7203
7204 static inline struct nfs4_client_reclaim *
alloc_reclaim(void)7205 alloc_reclaim(void)
7206 {
7207 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
7208 }
7209
7210 bool
nfs4_has_reclaimed_state(struct xdr_netobj name,struct nfsd_net * nn)7211 nfs4_has_reclaimed_state(struct xdr_netobj name, struct nfsd_net *nn)
7212 {
7213 struct nfs4_client_reclaim *crp;
7214
7215 crp = nfsd4_find_reclaim_client(name, nn);
7216 return (crp && crp->cr_clp);
7217 }
7218
7219 /*
7220 * failure => all reset bets are off, nfserr_no_grace...
7221 *
7222 * The caller is responsible for freeing name.data if NULL is returned (it
7223 * will be freed in nfs4_remove_reclaim_record in the normal case).
7224 */
7225 struct nfs4_client_reclaim *
nfs4_client_to_reclaim(struct xdr_netobj name,struct xdr_netobj princhash,struct nfsd_net * nn)7226 nfs4_client_to_reclaim(struct xdr_netobj name, struct xdr_netobj princhash,
7227 struct nfsd_net *nn)
7228 {
7229 unsigned int strhashval;
7230 struct nfs4_client_reclaim *crp;
7231
7232 trace_nfsd_clid_reclaim(nn, name.len, name.data);
7233 crp = alloc_reclaim();
7234 if (crp) {
7235 strhashval = clientstr_hashval(name);
7236 INIT_LIST_HEAD(&crp->cr_strhash);
7237 list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
7238 crp->cr_name.data = name.data;
7239 crp->cr_name.len = name.len;
7240 crp->cr_princhash.data = princhash.data;
7241 crp->cr_princhash.len = princhash.len;
7242 crp->cr_clp = NULL;
7243 nn->reclaim_str_hashtbl_size++;
7244 }
7245 return crp;
7246 }
7247
7248 void
nfs4_remove_reclaim_record(struct nfs4_client_reclaim * crp,struct nfsd_net * nn)7249 nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
7250 {
7251 list_del(&crp->cr_strhash);
7252 kfree(crp->cr_name.data);
7253 kfree(crp->cr_princhash.data);
7254 kfree(crp);
7255 nn->reclaim_str_hashtbl_size--;
7256 }
7257
7258 void
nfs4_release_reclaim(struct nfsd_net * nn)7259 nfs4_release_reclaim(struct nfsd_net *nn)
7260 {
7261 struct nfs4_client_reclaim *crp = NULL;
7262 int i;
7263
7264 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
7265 while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
7266 crp = list_entry(nn->reclaim_str_hashtbl[i].next,
7267 struct nfs4_client_reclaim, cr_strhash);
7268 nfs4_remove_reclaim_record(crp, nn);
7269 }
7270 }
7271 WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
7272 }
7273
7274 /*
7275 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
7276 struct nfs4_client_reclaim *
nfsd4_find_reclaim_client(struct xdr_netobj name,struct nfsd_net * nn)7277 nfsd4_find_reclaim_client(struct xdr_netobj name, struct nfsd_net *nn)
7278 {
7279 unsigned int strhashval;
7280 struct nfs4_client_reclaim *crp = NULL;
7281
7282 trace_nfsd_clid_find(nn, name.len, name.data);
7283
7284 strhashval = clientstr_hashval(name);
7285 list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
7286 if (compare_blob(&crp->cr_name, &name) == 0) {
7287 return crp;
7288 }
7289 }
7290 return NULL;
7291 }
7292
7293 __be32
nfs4_check_open_reclaim(struct nfs4_client * clp)7294 nfs4_check_open_reclaim(struct nfs4_client *clp)
7295 {
7296 if (test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &clp->cl_flags))
7297 return nfserr_no_grace;
7298
7299 if (nfsd4_client_record_check(clp))
7300 return nfserr_reclaim_bad;
7301
7302 return nfs_ok;
7303 }
7304
7305 /*
7306 * Since the lifetime of a delegation isn't limited to that of an open, a
7307 * client may quite reasonably hang on to a delegation as long as it has
7308 * the inode cached. This becomes an obvious problem the first time a
7309 * client's inode cache approaches the size of the server's total memory.
7310 *
7311 * For now we avoid this problem by imposing a hard limit on the number
7312 * of delegations, which varies according to the server's memory size.
7313 */
7314 static void
set_max_delegations(void)7315 set_max_delegations(void)
7316 {
7317 /*
7318 * Allow at most 4 delegations per megabyte of RAM. Quick
7319 * estimates suggest that in the worst case (where every delegation
7320 * is for a different inode), a delegation could take about 1.5K,
7321 * giving a worst case usage of about 6% of memory.
7322 */
7323 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
7324 }
7325
nfs4_state_create_net(struct net * net)7326 static int nfs4_state_create_net(struct net *net)
7327 {
7328 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7329 int i;
7330
7331 nn->conf_id_hashtbl = kmalloc_array(CLIENT_HASH_SIZE,
7332 sizeof(struct list_head),
7333 GFP_KERNEL);
7334 if (!nn->conf_id_hashtbl)
7335 goto err;
7336 nn->unconf_id_hashtbl = kmalloc_array(CLIENT_HASH_SIZE,
7337 sizeof(struct list_head),
7338 GFP_KERNEL);
7339 if (!nn->unconf_id_hashtbl)
7340 goto err_unconf_id;
7341 nn->sessionid_hashtbl = kmalloc_array(SESSION_HASH_SIZE,
7342 sizeof(struct list_head),
7343 GFP_KERNEL);
7344 if (!nn->sessionid_hashtbl)
7345 goto err_sessionid;
7346
7347 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
7348 INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
7349 INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
7350 }
7351 for (i = 0; i < SESSION_HASH_SIZE; i++)
7352 INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]);
7353 nn->conf_name_tree = RB_ROOT;
7354 nn->unconf_name_tree = RB_ROOT;
7355 nn->boot_time = ktime_get_real_seconds();
7356 nn->grace_ended = false;
7357 nn->nfsd4_manager.block_opens = true;
7358 INIT_LIST_HEAD(&nn->nfsd4_manager.list);
7359 INIT_LIST_HEAD(&nn->client_lru);
7360 INIT_LIST_HEAD(&nn->close_lru);
7361 INIT_LIST_HEAD(&nn->del_recall_lru);
7362 spin_lock_init(&nn->client_lock);
7363 spin_lock_init(&nn->s2s_cp_lock);
7364 idr_init(&nn->s2s_cp_stateids);
7365
7366 spin_lock_init(&nn->blocked_locks_lock);
7367 INIT_LIST_HEAD(&nn->blocked_locks_lru);
7368
7369 INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
7370 get_net(net);
7371
7372 return 0;
7373
7374 err_sessionid:
7375 kfree(nn->unconf_id_hashtbl);
7376 err_unconf_id:
7377 kfree(nn->conf_id_hashtbl);
7378 err:
7379 return -ENOMEM;
7380 }
7381
7382 static void
nfs4_state_destroy_net(struct net * net)7383 nfs4_state_destroy_net(struct net *net)
7384 {
7385 int i;
7386 struct nfs4_client *clp = NULL;
7387 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7388
7389 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
7390 while (!list_empty(&nn->conf_id_hashtbl[i])) {
7391 clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
7392 destroy_client(clp);
7393 }
7394 }
7395
7396 WARN_ON(!list_empty(&nn->blocked_locks_lru));
7397
7398 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
7399 while (!list_empty(&nn->unconf_id_hashtbl[i])) {
7400 clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
7401 destroy_client(clp);
7402 }
7403 }
7404
7405 kfree(nn->sessionid_hashtbl);
7406 kfree(nn->unconf_id_hashtbl);
7407 kfree(nn->conf_id_hashtbl);
7408 put_net(net);
7409 }
7410
7411 int
nfs4_state_start_net(struct net * net)7412 nfs4_state_start_net(struct net *net)
7413 {
7414 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7415 int ret;
7416
7417 ret = nfs4_state_create_net(net);
7418 if (ret)
7419 return ret;
7420 locks_start_grace(net, &nn->nfsd4_manager);
7421 nfsd4_client_tracking_init(net);
7422 if (nn->track_reclaim_completes && nn->reclaim_str_hashtbl_size == 0)
7423 goto skip_grace;
7424 printk(KERN_INFO "NFSD: starting %lld-second grace period (net %x)\n",
7425 nn->nfsd4_grace, net->ns.inum);
7426 trace_nfsd_grace_start(nn);
7427 queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ);
7428 return 0;
7429
7430 skip_grace:
7431 printk(KERN_INFO "NFSD: no clients to reclaim, skipping NFSv4 grace period (net %x)\n",
7432 net->ns.inum);
7433 queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_lease * HZ);
7434 nfsd4_end_grace(nn);
7435 return 0;
7436 }
7437
7438 /* initialization to perform when the nfsd service is started: */
7439
7440 int
nfs4_state_start(void)7441 nfs4_state_start(void)
7442 {
7443 int ret;
7444
7445 laundry_wq = alloc_workqueue("%s", WQ_UNBOUND, 0, "nfsd4");
7446 if (laundry_wq == NULL) {
7447 ret = -ENOMEM;
7448 goto out;
7449 }
7450 ret = nfsd4_create_callback_queue();
7451 if (ret)
7452 goto out_free_laundry;
7453
7454 set_max_delegations();
7455 return 0;
7456
7457 out_free_laundry:
7458 destroy_workqueue(laundry_wq);
7459 out:
7460 return ret;
7461 }
7462
7463 void
nfs4_state_shutdown_net(struct net * net)7464 nfs4_state_shutdown_net(struct net *net)
7465 {
7466 struct nfs4_delegation *dp = NULL;
7467 struct list_head *pos, *next, reaplist;
7468 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7469
7470 cancel_delayed_work_sync(&nn->laundromat_work);
7471 locks_end_grace(&nn->nfsd4_manager);
7472
7473 INIT_LIST_HEAD(&reaplist);
7474 spin_lock(&state_lock);
7475 list_for_each_safe(pos, next, &nn->del_recall_lru) {
7476 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
7477 WARN_ON(!unhash_delegation_locked(dp));
7478 list_add(&dp->dl_recall_lru, &reaplist);
7479 }
7480 spin_unlock(&state_lock);
7481 list_for_each_safe(pos, next, &reaplist) {
7482 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
7483 list_del_init(&dp->dl_recall_lru);
7484 destroy_unhashed_deleg(dp);
7485 }
7486
7487 nfsd4_client_tracking_exit(net);
7488 nfs4_state_destroy_net(net);
7489 }
7490
7491 void
nfs4_state_shutdown(void)7492 nfs4_state_shutdown(void)
7493 {
7494 destroy_workqueue(laundry_wq);
7495 nfsd4_destroy_callback_queue();
7496 }
7497
7498 static void
get_stateid(struct nfsd4_compound_state * cstate,stateid_t * stateid)7499 get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
7500 {
7501 if (HAS_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG) &&
7502 CURRENT_STATEID(stateid))
7503 memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
7504 }
7505
7506 static void
put_stateid(struct nfsd4_compound_state * cstate,stateid_t * stateid)7507 put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
7508 {
7509 if (cstate->minorversion) {
7510 memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
7511 SET_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG);
7512 }
7513 }
7514
7515 void
clear_current_stateid(struct nfsd4_compound_state * cstate)7516 clear_current_stateid(struct nfsd4_compound_state *cstate)
7517 {
7518 CLEAR_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG);
7519 }
7520
7521 /*
7522 * functions to set current state id
7523 */
7524 void
nfsd4_set_opendowngradestateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7525 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate,
7526 union nfsd4_op_u *u)
7527 {
7528 put_stateid(cstate, &u->open_downgrade.od_stateid);
7529 }
7530
7531 void
nfsd4_set_openstateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7532 nfsd4_set_openstateid(struct nfsd4_compound_state *cstate,
7533 union nfsd4_op_u *u)
7534 {
7535 put_stateid(cstate, &u->open.op_stateid);
7536 }
7537
7538 void
nfsd4_set_closestateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7539 nfsd4_set_closestateid(struct nfsd4_compound_state *cstate,
7540 union nfsd4_op_u *u)
7541 {
7542 put_stateid(cstate, &u->close.cl_stateid);
7543 }
7544
7545 void
nfsd4_set_lockstateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7546 nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate,
7547 union nfsd4_op_u *u)
7548 {
7549 put_stateid(cstate, &u->lock.lk_resp_stateid);
7550 }
7551
7552 /*
7553 * functions to consume current state id
7554 */
7555
7556 void
nfsd4_get_opendowngradestateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7557 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate,
7558 union nfsd4_op_u *u)
7559 {
7560 get_stateid(cstate, &u->open_downgrade.od_stateid);
7561 }
7562
7563 void
nfsd4_get_delegreturnstateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7564 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate,
7565 union nfsd4_op_u *u)
7566 {
7567 get_stateid(cstate, &u->delegreturn.dr_stateid);
7568 }
7569
7570 void
nfsd4_get_freestateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7571 nfsd4_get_freestateid(struct nfsd4_compound_state *cstate,
7572 union nfsd4_op_u *u)
7573 {
7574 get_stateid(cstate, &u->free_stateid.fr_stateid);
7575 }
7576
7577 void
nfsd4_get_setattrstateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7578 nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate,
7579 union nfsd4_op_u *u)
7580 {
7581 get_stateid(cstate, &u->setattr.sa_stateid);
7582 }
7583
7584 void
nfsd4_get_closestateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7585 nfsd4_get_closestateid(struct nfsd4_compound_state *cstate,
7586 union nfsd4_op_u *u)
7587 {
7588 get_stateid(cstate, &u->close.cl_stateid);
7589 }
7590
7591 void
nfsd4_get_lockustateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7592 nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate,
7593 union nfsd4_op_u *u)
7594 {
7595 get_stateid(cstate, &u->locku.lu_stateid);
7596 }
7597
7598 void
nfsd4_get_readstateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7599 nfsd4_get_readstateid(struct nfsd4_compound_state *cstate,
7600 union nfsd4_op_u *u)
7601 {
7602 get_stateid(cstate, &u->read.rd_stateid);
7603 }
7604
7605 void
nfsd4_get_writestateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7606 nfsd4_get_writestateid(struct nfsd4_compound_state *cstate,
7607 union nfsd4_op_u *u)
7608 {
7609 get_stateid(cstate, &u->write.wr_stateid);
7610 }
7611