1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ceph/ceph_debug.h>
3
4 #include <linux/module.h>
5 #include <linux/fs.h>
6 #include <linux/slab.h>
7 #include <linux/string.h>
8 #include <linux/uaccess.h>
9 #include <linux/kernel.h>
10 #include <linux/writeback.h>
11 #include <linux/vmalloc.h>
12 #include <linux/xattr.h>
13 #include <linux/posix_acl.h>
14 #include <linux/random.h>
15 #include <linux/sort.h>
16 #include <linux/iversion.h>
17
18 #include "super.h"
19 #include "mds_client.h"
20 #include "cache.h"
21 #include <linux/ceph/decode.h>
22
23 /*
24 * Ceph inode operations
25 *
26 * Implement basic inode helpers (get, alloc) and inode ops (getattr,
27 * setattr, etc.), xattr helpers, and helpers for assimilating
28 * metadata returned by the MDS into our cache.
29 *
30 * Also define helpers for doing asynchronous writeback, invalidation,
31 * and truncation for the benefit of those who can't afford to block
32 * (typically because they are in the message handler path).
33 */
34
35 static const struct inode_operations ceph_symlink_iops;
36
37 static void ceph_inode_work(struct work_struct *work);
38
39 /*
40 * find or create an inode, given the ceph ino number
41 */
ceph_set_ino_cb(struct inode * inode,void * data)42 static int ceph_set_ino_cb(struct inode *inode, void *data)
43 {
44 struct ceph_inode_info *ci = ceph_inode(inode);
45 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
46
47 ci->i_vino = *(struct ceph_vino *)data;
48 inode->i_ino = ceph_vino_to_ino_t(ci->i_vino);
49 inode_set_iversion_raw(inode, 0);
50 percpu_counter_inc(&mdsc->metric.total_inodes);
51
52 return 0;
53 }
54
ceph_get_inode(struct super_block * sb,struct ceph_vino vino)55 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
56 {
57 struct inode *inode;
58
59 if (ceph_vino_is_reserved(vino))
60 return ERR_PTR(-EREMOTEIO);
61
62 inode = iget5_locked(sb, (unsigned long)vino.ino, ceph_ino_compare,
63 ceph_set_ino_cb, &vino);
64 if (!inode)
65 return ERR_PTR(-ENOMEM);
66
67 dout("get_inode on %llu=%llx.%llx got %p new %d\n", ceph_present_inode(inode),
68 ceph_vinop(inode), inode, !!(inode->i_state & I_NEW));
69 return inode;
70 }
71
72 /*
73 * get/constuct snapdir inode for a given directory
74 */
ceph_get_snapdir(struct inode * parent)75 struct inode *ceph_get_snapdir(struct inode *parent)
76 {
77 struct ceph_vino vino = {
78 .ino = ceph_ino(parent),
79 .snap = CEPH_SNAPDIR,
80 };
81 struct inode *inode = ceph_get_inode(parent->i_sb, vino);
82 struct ceph_inode_info *ci = ceph_inode(inode);
83
84 if (IS_ERR(inode))
85 return inode;
86
87 if (!S_ISDIR(parent->i_mode)) {
88 pr_warn_once("bad snapdir parent type (mode=0%o)\n",
89 parent->i_mode);
90 return ERR_PTR(-ENOTDIR);
91 }
92
93 if (!(inode->i_state & I_NEW) && !S_ISDIR(inode->i_mode)) {
94 pr_warn_once("bad snapdir inode type (mode=0%o)\n",
95 inode->i_mode);
96 return ERR_PTR(-ENOTDIR);
97 }
98
99 inode->i_mode = parent->i_mode;
100 inode->i_uid = parent->i_uid;
101 inode->i_gid = parent->i_gid;
102 inode->i_mtime = parent->i_mtime;
103 inode->i_ctime = parent->i_ctime;
104 inode->i_atime = parent->i_atime;
105 ci->i_rbytes = 0;
106 ci->i_btime = ceph_inode(parent)->i_btime;
107
108 if (inode->i_state & I_NEW) {
109 inode->i_op = &ceph_snapdir_iops;
110 inode->i_fop = &ceph_snapdir_fops;
111 ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
112 unlock_new_inode(inode);
113 }
114
115 return inode;
116 }
117
118 const struct inode_operations ceph_file_iops = {
119 .permission = ceph_permission,
120 .setattr = ceph_setattr,
121 .getattr = ceph_getattr,
122 .listxattr = ceph_listxattr,
123 .get_acl = ceph_get_acl,
124 .set_acl = ceph_set_acl,
125 };
126
127
128 /*
129 * We use a 'frag tree' to keep track of the MDS's directory fragments
130 * for a given inode (usually there is just a single fragment). We
131 * need to know when a child frag is delegated to a new MDS, or when
132 * it is flagged as replicated, so we can direct our requests
133 * accordingly.
134 */
135
136 /*
137 * find/create a frag in the tree
138 */
__get_or_create_frag(struct ceph_inode_info * ci,u32 f)139 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
140 u32 f)
141 {
142 struct rb_node **p;
143 struct rb_node *parent = NULL;
144 struct ceph_inode_frag *frag;
145 int c;
146
147 p = &ci->i_fragtree.rb_node;
148 while (*p) {
149 parent = *p;
150 frag = rb_entry(parent, struct ceph_inode_frag, node);
151 c = ceph_frag_compare(f, frag->frag);
152 if (c < 0)
153 p = &(*p)->rb_left;
154 else if (c > 0)
155 p = &(*p)->rb_right;
156 else
157 return frag;
158 }
159
160 frag = kmalloc(sizeof(*frag), GFP_NOFS);
161 if (!frag)
162 return ERR_PTR(-ENOMEM);
163
164 frag->frag = f;
165 frag->split_by = 0;
166 frag->mds = -1;
167 frag->ndist = 0;
168
169 rb_link_node(&frag->node, parent, p);
170 rb_insert_color(&frag->node, &ci->i_fragtree);
171
172 dout("get_or_create_frag added %llx.%llx frag %x\n",
173 ceph_vinop(&ci->vfs_inode), f);
174 return frag;
175 }
176
177 /*
178 * find a specific frag @f
179 */
__ceph_find_frag(struct ceph_inode_info * ci,u32 f)180 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
181 {
182 struct rb_node *n = ci->i_fragtree.rb_node;
183
184 while (n) {
185 struct ceph_inode_frag *frag =
186 rb_entry(n, struct ceph_inode_frag, node);
187 int c = ceph_frag_compare(f, frag->frag);
188 if (c < 0)
189 n = n->rb_left;
190 else if (c > 0)
191 n = n->rb_right;
192 else
193 return frag;
194 }
195 return NULL;
196 }
197
198 /*
199 * Choose frag containing the given value @v. If @pfrag is
200 * specified, copy the frag delegation info to the caller if
201 * it is present.
202 */
__ceph_choose_frag(struct ceph_inode_info * ci,u32 v,struct ceph_inode_frag * pfrag,int * found)203 static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
204 struct ceph_inode_frag *pfrag, int *found)
205 {
206 u32 t = ceph_frag_make(0, 0);
207 struct ceph_inode_frag *frag;
208 unsigned nway, i;
209 u32 n;
210
211 if (found)
212 *found = 0;
213
214 while (1) {
215 WARN_ON(!ceph_frag_contains_value(t, v));
216 frag = __ceph_find_frag(ci, t);
217 if (!frag)
218 break; /* t is a leaf */
219 if (frag->split_by == 0) {
220 if (pfrag)
221 memcpy(pfrag, frag, sizeof(*pfrag));
222 if (found)
223 *found = 1;
224 break;
225 }
226
227 /* choose child */
228 nway = 1 << frag->split_by;
229 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
230 frag->split_by, nway);
231 for (i = 0; i < nway; i++) {
232 n = ceph_frag_make_child(t, frag->split_by, i);
233 if (ceph_frag_contains_value(n, v)) {
234 t = n;
235 break;
236 }
237 }
238 BUG_ON(i == nway);
239 }
240 dout("choose_frag(%x) = %x\n", v, t);
241
242 return t;
243 }
244
ceph_choose_frag(struct ceph_inode_info * ci,u32 v,struct ceph_inode_frag * pfrag,int * found)245 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
246 struct ceph_inode_frag *pfrag, int *found)
247 {
248 u32 ret;
249 mutex_lock(&ci->i_fragtree_mutex);
250 ret = __ceph_choose_frag(ci, v, pfrag, found);
251 mutex_unlock(&ci->i_fragtree_mutex);
252 return ret;
253 }
254
255 /*
256 * Process dirfrag (delegation) info from the mds. Include leaf
257 * fragment in tree ONLY if ndist > 0. Otherwise, only
258 * branches/splits are included in i_fragtree)
259 */
ceph_fill_dirfrag(struct inode * inode,struct ceph_mds_reply_dirfrag * dirinfo)260 static int ceph_fill_dirfrag(struct inode *inode,
261 struct ceph_mds_reply_dirfrag *dirinfo)
262 {
263 struct ceph_inode_info *ci = ceph_inode(inode);
264 struct ceph_inode_frag *frag;
265 u32 id = le32_to_cpu(dirinfo->frag);
266 int mds = le32_to_cpu(dirinfo->auth);
267 int ndist = le32_to_cpu(dirinfo->ndist);
268 int diri_auth = -1;
269 int i;
270 int err = 0;
271
272 spin_lock(&ci->i_ceph_lock);
273 if (ci->i_auth_cap)
274 diri_auth = ci->i_auth_cap->mds;
275 spin_unlock(&ci->i_ceph_lock);
276
277 if (mds == -1) /* CDIR_AUTH_PARENT */
278 mds = diri_auth;
279
280 mutex_lock(&ci->i_fragtree_mutex);
281 if (ndist == 0 && mds == diri_auth) {
282 /* no delegation info needed. */
283 frag = __ceph_find_frag(ci, id);
284 if (!frag)
285 goto out;
286 if (frag->split_by == 0) {
287 /* tree leaf, remove */
288 dout("fill_dirfrag removed %llx.%llx frag %x"
289 " (no ref)\n", ceph_vinop(inode), id);
290 rb_erase(&frag->node, &ci->i_fragtree);
291 kfree(frag);
292 } else {
293 /* tree branch, keep and clear */
294 dout("fill_dirfrag cleared %llx.%llx frag %x"
295 " referral\n", ceph_vinop(inode), id);
296 frag->mds = -1;
297 frag->ndist = 0;
298 }
299 goto out;
300 }
301
302
303 /* find/add this frag to store mds delegation info */
304 frag = __get_or_create_frag(ci, id);
305 if (IS_ERR(frag)) {
306 /* this is not the end of the world; we can continue
307 with bad/inaccurate delegation info */
308 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
309 ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
310 err = -ENOMEM;
311 goto out;
312 }
313
314 frag->mds = mds;
315 frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
316 for (i = 0; i < frag->ndist; i++)
317 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
318 dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
319 ceph_vinop(inode), frag->frag, frag->ndist);
320
321 out:
322 mutex_unlock(&ci->i_fragtree_mutex);
323 return err;
324 }
325
frag_tree_split_cmp(const void * l,const void * r)326 static int frag_tree_split_cmp(const void *l, const void *r)
327 {
328 struct ceph_frag_tree_split *ls = (struct ceph_frag_tree_split*)l;
329 struct ceph_frag_tree_split *rs = (struct ceph_frag_tree_split*)r;
330 return ceph_frag_compare(le32_to_cpu(ls->frag),
331 le32_to_cpu(rs->frag));
332 }
333
is_frag_child(u32 f,struct ceph_inode_frag * frag)334 static bool is_frag_child(u32 f, struct ceph_inode_frag *frag)
335 {
336 if (!frag)
337 return f == ceph_frag_make(0, 0);
338 if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by)
339 return false;
340 return ceph_frag_contains_value(frag->frag, ceph_frag_value(f));
341 }
342
ceph_fill_fragtree(struct inode * inode,struct ceph_frag_tree_head * fragtree,struct ceph_mds_reply_dirfrag * dirinfo)343 static int ceph_fill_fragtree(struct inode *inode,
344 struct ceph_frag_tree_head *fragtree,
345 struct ceph_mds_reply_dirfrag *dirinfo)
346 {
347 struct ceph_inode_info *ci = ceph_inode(inode);
348 struct ceph_inode_frag *frag, *prev_frag = NULL;
349 struct rb_node *rb_node;
350 unsigned i, split_by, nsplits;
351 u32 id;
352 bool update = false;
353
354 mutex_lock(&ci->i_fragtree_mutex);
355 nsplits = le32_to_cpu(fragtree->nsplits);
356 if (nsplits != ci->i_fragtree_nsplits) {
357 update = true;
358 } else if (nsplits) {
359 i = prandom_u32() % nsplits;
360 id = le32_to_cpu(fragtree->splits[i].frag);
361 if (!__ceph_find_frag(ci, id))
362 update = true;
363 } else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) {
364 rb_node = rb_first(&ci->i_fragtree);
365 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
366 if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node))
367 update = true;
368 }
369 if (!update && dirinfo) {
370 id = le32_to_cpu(dirinfo->frag);
371 if (id != __ceph_choose_frag(ci, id, NULL, NULL))
372 update = true;
373 }
374 if (!update)
375 goto out_unlock;
376
377 if (nsplits > 1) {
378 sort(fragtree->splits, nsplits, sizeof(fragtree->splits[0]),
379 frag_tree_split_cmp, NULL);
380 }
381
382 dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode));
383 rb_node = rb_first(&ci->i_fragtree);
384 for (i = 0; i < nsplits; i++) {
385 id = le32_to_cpu(fragtree->splits[i].frag);
386 split_by = le32_to_cpu(fragtree->splits[i].by);
387 if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) {
388 pr_err("fill_fragtree %llx.%llx invalid split %d/%u, "
389 "frag %x split by %d\n", ceph_vinop(inode),
390 i, nsplits, id, split_by);
391 continue;
392 }
393 frag = NULL;
394 while (rb_node) {
395 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
396 if (ceph_frag_compare(frag->frag, id) >= 0) {
397 if (frag->frag != id)
398 frag = NULL;
399 else
400 rb_node = rb_next(rb_node);
401 break;
402 }
403 rb_node = rb_next(rb_node);
404 /* delete stale split/leaf node */
405 if (frag->split_by > 0 ||
406 !is_frag_child(frag->frag, prev_frag)) {
407 rb_erase(&frag->node, &ci->i_fragtree);
408 if (frag->split_by > 0)
409 ci->i_fragtree_nsplits--;
410 kfree(frag);
411 }
412 frag = NULL;
413 }
414 if (!frag) {
415 frag = __get_or_create_frag(ci, id);
416 if (IS_ERR(frag))
417 continue;
418 }
419 if (frag->split_by == 0)
420 ci->i_fragtree_nsplits++;
421 frag->split_by = split_by;
422 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
423 prev_frag = frag;
424 }
425 while (rb_node) {
426 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
427 rb_node = rb_next(rb_node);
428 /* delete stale split/leaf node */
429 if (frag->split_by > 0 ||
430 !is_frag_child(frag->frag, prev_frag)) {
431 rb_erase(&frag->node, &ci->i_fragtree);
432 if (frag->split_by > 0)
433 ci->i_fragtree_nsplits--;
434 kfree(frag);
435 }
436 }
437 out_unlock:
438 mutex_unlock(&ci->i_fragtree_mutex);
439 return 0;
440 }
441
442 /*
443 * initialize a newly allocated inode.
444 */
ceph_alloc_inode(struct super_block * sb)445 struct inode *ceph_alloc_inode(struct super_block *sb)
446 {
447 struct ceph_inode_info *ci;
448 int i;
449
450 ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
451 if (!ci)
452 return NULL;
453
454 dout("alloc_inode %p\n", &ci->vfs_inode);
455
456 spin_lock_init(&ci->i_ceph_lock);
457
458 ci->i_version = 0;
459 ci->i_inline_version = 0;
460 ci->i_time_warp_seq = 0;
461 ci->i_ceph_flags = 0;
462 atomic64_set(&ci->i_ordered_count, 1);
463 atomic64_set(&ci->i_release_count, 1);
464 atomic64_set(&ci->i_complete_seq[0], 0);
465 atomic64_set(&ci->i_complete_seq[1], 0);
466 ci->i_symlink = NULL;
467
468 ci->i_max_bytes = 0;
469 ci->i_max_files = 0;
470
471 memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
472 memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
473 RCU_INIT_POINTER(ci->i_layout.pool_ns, NULL);
474
475 ci->i_fragtree = RB_ROOT;
476 mutex_init(&ci->i_fragtree_mutex);
477
478 ci->i_xattrs.blob = NULL;
479 ci->i_xattrs.prealloc_blob = NULL;
480 ci->i_xattrs.dirty = false;
481 ci->i_xattrs.index = RB_ROOT;
482 ci->i_xattrs.count = 0;
483 ci->i_xattrs.names_size = 0;
484 ci->i_xattrs.vals_size = 0;
485 ci->i_xattrs.version = 0;
486 ci->i_xattrs.index_version = 0;
487
488 ci->i_caps = RB_ROOT;
489 ci->i_auth_cap = NULL;
490 ci->i_dirty_caps = 0;
491 ci->i_flushing_caps = 0;
492 INIT_LIST_HEAD(&ci->i_dirty_item);
493 INIT_LIST_HEAD(&ci->i_flushing_item);
494 ci->i_prealloc_cap_flush = NULL;
495 INIT_LIST_HEAD(&ci->i_cap_flush_list);
496 init_waitqueue_head(&ci->i_cap_wq);
497 ci->i_hold_caps_max = 0;
498 INIT_LIST_HEAD(&ci->i_cap_delay_list);
499 INIT_LIST_HEAD(&ci->i_cap_snaps);
500 ci->i_head_snapc = NULL;
501 ci->i_snap_caps = 0;
502
503 ci->i_last_rd = ci->i_last_wr = jiffies - 3600 * HZ;
504 for (i = 0; i < CEPH_FILE_MODE_BITS; i++)
505 ci->i_nr_by_mode[i] = 0;
506
507 mutex_init(&ci->i_truncate_mutex);
508 ci->i_truncate_seq = 0;
509 ci->i_truncate_size = 0;
510 ci->i_truncate_pending = 0;
511
512 ci->i_max_size = 0;
513 ci->i_reported_size = 0;
514 ci->i_wanted_max_size = 0;
515 ci->i_requested_max_size = 0;
516
517 ci->i_pin_ref = 0;
518 ci->i_rd_ref = 0;
519 ci->i_rdcache_ref = 0;
520 ci->i_wr_ref = 0;
521 ci->i_wb_ref = 0;
522 ci->i_fx_ref = 0;
523 ci->i_wrbuffer_ref = 0;
524 ci->i_wrbuffer_ref_head = 0;
525 atomic_set(&ci->i_filelock_ref, 0);
526 atomic_set(&ci->i_shared_gen, 1);
527 ci->i_rdcache_gen = 0;
528 ci->i_rdcache_revoking = 0;
529
530 INIT_LIST_HEAD(&ci->i_unsafe_dirops);
531 INIT_LIST_HEAD(&ci->i_unsafe_iops);
532 spin_lock_init(&ci->i_unsafe_lock);
533
534 ci->i_snap_realm = NULL;
535 INIT_LIST_HEAD(&ci->i_snap_realm_item);
536 INIT_LIST_HEAD(&ci->i_snap_flush_item);
537
538 INIT_WORK(&ci->i_work, ceph_inode_work);
539 ci->i_work_mask = 0;
540 memset(&ci->i_btime, '\0', sizeof(ci->i_btime));
541
542 ceph_fscache_inode_init(ci);
543
544 ci->i_meta_err = 0;
545
546 return &ci->vfs_inode;
547 }
548
ceph_free_inode(struct inode * inode)549 void ceph_free_inode(struct inode *inode)
550 {
551 struct ceph_inode_info *ci = ceph_inode(inode);
552
553 kfree(ci->i_symlink);
554 kmem_cache_free(ceph_inode_cachep, ci);
555 }
556
ceph_evict_inode(struct inode * inode)557 void ceph_evict_inode(struct inode *inode)
558 {
559 struct ceph_inode_info *ci = ceph_inode(inode);
560 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
561 struct ceph_inode_frag *frag;
562 struct rb_node *n;
563
564 dout("evict_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
565
566 percpu_counter_dec(&mdsc->metric.total_inodes);
567
568 truncate_inode_pages_final(&inode->i_data);
569 clear_inode(inode);
570
571 ceph_fscache_unregister_inode_cookie(ci);
572
573 __ceph_remove_caps(ci);
574
575 if (__ceph_has_any_quota(ci))
576 ceph_adjust_quota_realms_count(inode, false);
577
578 /*
579 * we may still have a snap_realm reference if there are stray
580 * caps in i_snap_caps.
581 */
582 if (ci->i_snap_realm) {
583 if (ceph_snap(inode) == CEPH_NOSNAP) {
584 struct ceph_snap_realm *realm = ci->i_snap_realm;
585 dout(" dropping residual ref to snap realm %p\n",
586 realm);
587 spin_lock(&realm->inodes_with_caps_lock);
588 list_del_init(&ci->i_snap_realm_item);
589 ci->i_snap_realm = NULL;
590 if (realm->ino == ci->i_vino.ino)
591 realm->inode = NULL;
592 spin_unlock(&realm->inodes_with_caps_lock);
593 ceph_put_snap_realm(mdsc, realm);
594 } else {
595 ceph_put_snapid_map(mdsc, ci->i_snapid_map);
596 ci->i_snap_realm = NULL;
597 }
598 }
599
600 while ((n = rb_first(&ci->i_fragtree)) != NULL) {
601 frag = rb_entry(n, struct ceph_inode_frag, node);
602 rb_erase(n, &ci->i_fragtree);
603 kfree(frag);
604 }
605 ci->i_fragtree_nsplits = 0;
606
607 __ceph_destroy_xattrs(ci);
608 if (ci->i_xattrs.blob)
609 ceph_buffer_put(ci->i_xattrs.blob);
610 if (ci->i_xattrs.prealloc_blob)
611 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
612
613 ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns));
614 ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
615 }
616
calc_inode_blocks(u64 size)617 static inline blkcnt_t calc_inode_blocks(u64 size)
618 {
619 return (size + (1<<9) - 1) >> 9;
620 }
621
622 /*
623 * Helpers to fill in size, ctime, mtime, and atime. We have to be
624 * careful because either the client or MDS may have more up to date
625 * info, depending on which capabilities are held, and whether
626 * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime
627 * and size are monotonically increasing, except when utimes() or
628 * truncate() increments the corresponding _seq values.)
629 */
ceph_fill_file_size(struct inode * inode,int issued,u32 truncate_seq,u64 truncate_size,u64 size)630 int ceph_fill_file_size(struct inode *inode, int issued,
631 u32 truncate_seq, u64 truncate_size, u64 size)
632 {
633 struct ceph_inode_info *ci = ceph_inode(inode);
634 int queue_trunc = 0;
635 loff_t isize = i_size_read(inode);
636
637 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
638 (truncate_seq == ci->i_truncate_seq && size > isize)) {
639 dout("size %lld -> %llu\n", isize, size);
640 if (size > 0 && S_ISDIR(inode->i_mode)) {
641 pr_err("fill_file_size non-zero size for directory\n");
642 size = 0;
643 }
644 i_size_write(inode, size);
645 inode->i_blocks = calc_inode_blocks(size);
646 ci->i_reported_size = size;
647 if (truncate_seq != ci->i_truncate_seq) {
648 dout("truncate_seq %u -> %u\n",
649 ci->i_truncate_seq, truncate_seq);
650 ci->i_truncate_seq = truncate_seq;
651
652 /* the MDS should have revoked these caps */
653 WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
654 CEPH_CAP_FILE_RD |
655 CEPH_CAP_FILE_WR |
656 CEPH_CAP_FILE_LAZYIO));
657 /*
658 * If we hold relevant caps, or in the case where we're
659 * not the only client referencing this file and we
660 * don't hold those caps, then we need to check whether
661 * the file is either opened or mmaped
662 */
663 if ((issued & (CEPH_CAP_FILE_CACHE|
664 CEPH_CAP_FILE_BUFFER)) ||
665 mapping_mapped(inode->i_mapping) ||
666 __ceph_is_file_opened(ci)) {
667 ci->i_truncate_pending++;
668 queue_trunc = 1;
669 }
670 }
671 }
672 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
673 ci->i_truncate_size != truncate_size) {
674 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
675 truncate_size);
676 ci->i_truncate_size = truncate_size;
677 }
678
679 if (queue_trunc)
680 ceph_fscache_invalidate(inode);
681
682 return queue_trunc;
683 }
684
ceph_fill_file_time(struct inode * inode,int issued,u64 time_warp_seq,struct timespec64 * ctime,struct timespec64 * mtime,struct timespec64 * atime)685 void ceph_fill_file_time(struct inode *inode, int issued,
686 u64 time_warp_seq, struct timespec64 *ctime,
687 struct timespec64 *mtime, struct timespec64 *atime)
688 {
689 struct ceph_inode_info *ci = ceph_inode(inode);
690 int warn = 0;
691
692 if (issued & (CEPH_CAP_FILE_EXCL|
693 CEPH_CAP_FILE_WR|
694 CEPH_CAP_FILE_BUFFER|
695 CEPH_CAP_AUTH_EXCL|
696 CEPH_CAP_XATTR_EXCL)) {
697 if (ci->i_version == 0 ||
698 timespec64_compare(ctime, &inode->i_ctime) > 0) {
699 dout("ctime %lld.%09ld -> %lld.%09ld inc w/ cap\n",
700 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
701 ctime->tv_sec, ctime->tv_nsec);
702 inode->i_ctime = *ctime;
703 }
704 if (ci->i_version == 0 ||
705 ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
706 /* the MDS did a utimes() */
707 dout("mtime %lld.%09ld -> %lld.%09ld "
708 "tw %d -> %d\n",
709 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
710 mtime->tv_sec, mtime->tv_nsec,
711 ci->i_time_warp_seq, (int)time_warp_seq);
712
713 inode->i_mtime = *mtime;
714 inode->i_atime = *atime;
715 ci->i_time_warp_seq = time_warp_seq;
716 } else if (time_warp_seq == ci->i_time_warp_seq) {
717 /* nobody did utimes(); take the max */
718 if (timespec64_compare(mtime, &inode->i_mtime) > 0) {
719 dout("mtime %lld.%09ld -> %lld.%09ld inc\n",
720 inode->i_mtime.tv_sec,
721 inode->i_mtime.tv_nsec,
722 mtime->tv_sec, mtime->tv_nsec);
723 inode->i_mtime = *mtime;
724 }
725 if (timespec64_compare(atime, &inode->i_atime) > 0) {
726 dout("atime %lld.%09ld -> %lld.%09ld inc\n",
727 inode->i_atime.tv_sec,
728 inode->i_atime.tv_nsec,
729 atime->tv_sec, atime->tv_nsec);
730 inode->i_atime = *atime;
731 }
732 } else if (issued & CEPH_CAP_FILE_EXCL) {
733 /* we did a utimes(); ignore mds values */
734 } else {
735 warn = 1;
736 }
737 } else {
738 /* we have no write|excl caps; whatever the MDS says is true */
739 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
740 inode->i_ctime = *ctime;
741 inode->i_mtime = *mtime;
742 inode->i_atime = *atime;
743 ci->i_time_warp_seq = time_warp_seq;
744 } else {
745 warn = 1;
746 }
747 }
748 if (warn) /* time_warp_seq shouldn't go backwards */
749 dout("%p mds time_warp_seq %llu < %u\n",
750 inode, time_warp_seq, ci->i_time_warp_seq);
751 }
752
753 /*
754 * Populate an inode based on info from mds. May be called on new or
755 * existing inodes.
756 */
ceph_fill_inode(struct inode * inode,struct page * locked_page,struct ceph_mds_reply_info_in * iinfo,struct ceph_mds_reply_dirfrag * dirinfo,struct ceph_mds_session * session,int cap_fmode,struct ceph_cap_reservation * caps_reservation)757 int ceph_fill_inode(struct inode *inode, struct page *locked_page,
758 struct ceph_mds_reply_info_in *iinfo,
759 struct ceph_mds_reply_dirfrag *dirinfo,
760 struct ceph_mds_session *session, int cap_fmode,
761 struct ceph_cap_reservation *caps_reservation)
762 {
763 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
764 struct ceph_mds_reply_inode *info = iinfo->in;
765 struct ceph_inode_info *ci = ceph_inode(inode);
766 int issued, new_issued, info_caps;
767 struct timespec64 mtime, atime, ctime;
768 struct ceph_buffer *xattr_blob = NULL;
769 struct ceph_buffer *old_blob = NULL;
770 struct ceph_string *pool_ns = NULL;
771 struct ceph_cap *new_cap = NULL;
772 int err = 0;
773 bool wake = false;
774 bool queue_trunc = false;
775 bool new_version = false;
776 bool fill_inline = false;
777 umode_t mode = le32_to_cpu(info->mode);
778 dev_t rdev = le32_to_cpu(info->rdev);
779
780 dout("%s %p ino %llx.%llx v %llu had %llu\n", __func__,
781 inode, ceph_vinop(inode), le64_to_cpu(info->version),
782 ci->i_version);
783
784 /* Once I_NEW is cleared, we can't change type or dev numbers */
785 if (inode->i_state & I_NEW) {
786 inode->i_mode = mode;
787 } else {
788 if (inode_wrong_type(inode, mode)) {
789 pr_warn_once("inode type changed! (ino %llx.%llx is 0%o, mds says 0%o)\n",
790 ceph_vinop(inode), inode->i_mode, mode);
791 return -ESTALE;
792 }
793
794 if ((S_ISCHR(mode) || S_ISBLK(mode)) && inode->i_rdev != rdev) {
795 pr_warn_once("dev inode rdev changed! (ino %llx.%llx is %u:%u, mds says %u:%u)\n",
796 ceph_vinop(inode), MAJOR(inode->i_rdev),
797 MINOR(inode->i_rdev), MAJOR(rdev),
798 MINOR(rdev));
799 return -ESTALE;
800 }
801 }
802
803 info_caps = le32_to_cpu(info->cap.caps);
804
805 /* prealloc new cap struct */
806 if (info_caps && ceph_snap(inode) == CEPH_NOSNAP) {
807 new_cap = ceph_get_cap(mdsc, caps_reservation);
808 if (!new_cap)
809 return -ENOMEM;
810 }
811
812 /*
813 * prealloc xattr data, if it looks like we'll need it. only
814 * if len > 4 (meaning there are actually xattrs; the first 4
815 * bytes are the xattr count).
816 */
817 if (iinfo->xattr_len > 4) {
818 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
819 if (!xattr_blob)
820 pr_err("%s ENOMEM xattr blob %d bytes\n", __func__,
821 iinfo->xattr_len);
822 }
823
824 if (iinfo->pool_ns_len > 0)
825 pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data,
826 iinfo->pool_ns_len);
827
828 if (ceph_snap(inode) != CEPH_NOSNAP && !ci->i_snapid_map)
829 ci->i_snapid_map = ceph_get_snapid_map(mdsc, ceph_snap(inode));
830
831 spin_lock(&ci->i_ceph_lock);
832
833 /*
834 * provided version will be odd if inode value is projected,
835 * even if stable. skip the update if we have newer stable
836 * info (ours>=theirs, e.g. due to racing mds replies), unless
837 * we are getting projected (unstable) info (in which case the
838 * version is odd, and we want ours>theirs).
839 * us them
840 * 2 2 skip
841 * 3 2 skip
842 * 3 3 update
843 */
844 if (ci->i_version == 0 ||
845 ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
846 le64_to_cpu(info->version) > (ci->i_version & ~1)))
847 new_version = true;
848
849 /* Update change_attribute */
850 inode_set_max_iversion_raw(inode, iinfo->change_attr);
851
852 __ceph_caps_issued(ci, &issued);
853 issued |= __ceph_caps_dirty(ci);
854 new_issued = ~issued & info_caps;
855
856 /* directories have fl_stripe_unit set to zero */
857 if (le32_to_cpu(info->layout.fl_stripe_unit))
858 inode->i_blkbits =
859 fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
860 else
861 inode->i_blkbits = CEPH_BLOCK_SHIFT;
862
863 __ceph_update_quota(ci, iinfo->max_bytes, iinfo->max_files);
864
865 if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
866 (issued & CEPH_CAP_AUTH_EXCL) == 0) {
867 inode->i_mode = mode;
868 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
869 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
870 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
871 from_kuid(&init_user_ns, inode->i_uid),
872 from_kgid(&init_user_ns, inode->i_gid));
873 ceph_decode_timespec64(&ci->i_btime, &iinfo->btime);
874 ceph_decode_timespec64(&ci->i_snap_btime, &iinfo->snap_btime);
875 }
876
877 if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
878 (issued & CEPH_CAP_LINK_EXCL) == 0)
879 set_nlink(inode, le32_to_cpu(info->nlink));
880
881 if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
882 /* be careful with mtime, atime, size */
883 ceph_decode_timespec64(&atime, &info->atime);
884 ceph_decode_timespec64(&mtime, &info->mtime);
885 ceph_decode_timespec64(&ctime, &info->ctime);
886 ceph_fill_file_time(inode, issued,
887 le32_to_cpu(info->time_warp_seq),
888 &ctime, &mtime, &atime);
889 }
890
891 if (new_version || (info_caps & CEPH_CAP_FILE_SHARED)) {
892 ci->i_files = le64_to_cpu(info->files);
893 ci->i_subdirs = le64_to_cpu(info->subdirs);
894 }
895
896 if (new_version ||
897 (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
898 s64 old_pool = ci->i_layout.pool_id;
899 struct ceph_string *old_ns;
900
901 ceph_file_layout_from_legacy(&ci->i_layout, &info->layout);
902 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
903 lockdep_is_held(&ci->i_ceph_lock));
904 rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns);
905
906 if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns)
907 ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
908
909 pool_ns = old_ns;
910
911 queue_trunc = ceph_fill_file_size(inode, issued,
912 le32_to_cpu(info->truncate_seq),
913 le64_to_cpu(info->truncate_size),
914 le64_to_cpu(info->size));
915 /* only update max_size on auth cap */
916 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
917 ci->i_max_size != le64_to_cpu(info->max_size)) {
918 dout("max_size %lld -> %llu\n", ci->i_max_size,
919 le64_to_cpu(info->max_size));
920 ci->i_max_size = le64_to_cpu(info->max_size);
921 }
922 }
923
924 /* layout and rstat are not tracked by capability, update them if
925 * the inode info is from auth mds */
926 if (new_version || (info->cap.flags & CEPH_CAP_FLAG_AUTH)) {
927 if (S_ISDIR(inode->i_mode)) {
928 ci->i_dir_layout = iinfo->dir_layout;
929 ci->i_rbytes = le64_to_cpu(info->rbytes);
930 ci->i_rfiles = le64_to_cpu(info->rfiles);
931 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
932 ci->i_dir_pin = iinfo->dir_pin;
933 ci->i_rsnaps = iinfo->rsnaps;
934 ceph_decode_timespec64(&ci->i_rctime, &info->rctime);
935 }
936 }
937
938 /* xattrs */
939 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
940 if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL)) &&
941 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
942 if (ci->i_xattrs.blob)
943 old_blob = ci->i_xattrs.blob;
944 ci->i_xattrs.blob = xattr_blob;
945 if (xattr_blob)
946 memcpy(ci->i_xattrs.blob->vec.iov_base,
947 iinfo->xattr_data, iinfo->xattr_len);
948 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
949 ceph_forget_all_cached_acls(inode);
950 ceph_security_invalidate_secctx(inode);
951 xattr_blob = NULL;
952 }
953
954 /* finally update i_version */
955 if (le64_to_cpu(info->version) > ci->i_version)
956 ci->i_version = le64_to_cpu(info->version);
957
958 inode->i_mapping->a_ops = &ceph_aops;
959
960 switch (inode->i_mode & S_IFMT) {
961 case S_IFIFO:
962 case S_IFBLK:
963 case S_IFCHR:
964 case S_IFSOCK:
965 inode->i_blkbits = PAGE_SHIFT;
966 init_special_inode(inode, inode->i_mode, rdev);
967 inode->i_op = &ceph_file_iops;
968 break;
969 case S_IFREG:
970 inode->i_op = &ceph_file_iops;
971 inode->i_fop = &ceph_file_fops;
972 break;
973 case S_IFLNK:
974 inode->i_op = &ceph_symlink_iops;
975 if (!ci->i_symlink) {
976 u32 symlen = iinfo->symlink_len;
977 char *sym;
978
979 spin_unlock(&ci->i_ceph_lock);
980
981 if (symlen != i_size_read(inode)) {
982 pr_err("%s %llx.%llx BAD symlink "
983 "size %lld\n", __func__,
984 ceph_vinop(inode),
985 i_size_read(inode));
986 i_size_write(inode, symlen);
987 inode->i_blocks = calc_inode_blocks(symlen);
988 }
989
990 err = -ENOMEM;
991 sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
992 if (!sym)
993 goto out;
994
995 spin_lock(&ci->i_ceph_lock);
996 if (!ci->i_symlink)
997 ci->i_symlink = sym;
998 else
999 kfree(sym); /* lost a race */
1000 }
1001 inode->i_link = ci->i_symlink;
1002 break;
1003 case S_IFDIR:
1004 inode->i_op = &ceph_dir_iops;
1005 inode->i_fop = &ceph_dir_fops;
1006 break;
1007 default:
1008 pr_err("%s %llx.%llx BAD mode 0%o\n", __func__,
1009 ceph_vinop(inode), inode->i_mode);
1010 }
1011
1012 /* were we issued a capability? */
1013 if (info_caps) {
1014 if (ceph_snap(inode) == CEPH_NOSNAP) {
1015 ceph_add_cap(inode, session,
1016 le64_to_cpu(info->cap.cap_id),
1017 info_caps,
1018 le32_to_cpu(info->cap.wanted),
1019 le32_to_cpu(info->cap.seq),
1020 le32_to_cpu(info->cap.mseq),
1021 le64_to_cpu(info->cap.realm),
1022 info->cap.flags, &new_cap);
1023
1024 /* set dir completion flag? */
1025 if (S_ISDIR(inode->i_mode) &&
1026 ci->i_files == 0 && ci->i_subdirs == 0 &&
1027 (info_caps & CEPH_CAP_FILE_SHARED) &&
1028 (issued & CEPH_CAP_FILE_EXCL) == 0 &&
1029 !__ceph_dir_is_complete(ci)) {
1030 dout(" marking %p complete (empty)\n", inode);
1031 i_size_write(inode, 0);
1032 __ceph_dir_set_complete(ci,
1033 atomic64_read(&ci->i_release_count),
1034 atomic64_read(&ci->i_ordered_count));
1035 }
1036
1037 wake = true;
1038 } else {
1039 dout(" %p got snap_caps %s\n", inode,
1040 ceph_cap_string(info_caps));
1041 ci->i_snap_caps |= info_caps;
1042 }
1043 }
1044
1045 if (iinfo->inline_version > 0 &&
1046 iinfo->inline_version >= ci->i_inline_version) {
1047 int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1048 ci->i_inline_version = iinfo->inline_version;
1049 if (ci->i_inline_version != CEPH_INLINE_NONE &&
1050 (locked_page || (info_caps & cache_caps)))
1051 fill_inline = true;
1052 }
1053
1054 if (cap_fmode >= 0) {
1055 if (!info_caps)
1056 pr_warn("mds issued no caps on %llx.%llx\n",
1057 ceph_vinop(inode));
1058 __ceph_touch_fmode(ci, mdsc, cap_fmode);
1059 }
1060
1061 spin_unlock(&ci->i_ceph_lock);
1062
1063 if (fill_inline)
1064 ceph_fill_inline_data(inode, locked_page,
1065 iinfo->inline_data, iinfo->inline_len);
1066
1067 if (wake)
1068 wake_up_all(&ci->i_cap_wq);
1069
1070 /* queue truncate if we saw i_size decrease */
1071 if (queue_trunc)
1072 ceph_queue_vmtruncate(inode);
1073
1074 /* populate frag tree */
1075 if (S_ISDIR(inode->i_mode))
1076 ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
1077
1078 /* update delegation info? */
1079 if (dirinfo)
1080 ceph_fill_dirfrag(inode, dirinfo);
1081
1082 err = 0;
1083 out:
1084 if (new_cap)
1085 ceph_put_cap(mdsc, new_cap);
1086 ceph_buffer_put(old_blob);
1087 ceph_buffer_put(xattr_blob);
1088 ceph_put_string(pool_ns);
1089 return err;
1090 }
1091
1092 /*
1093 * caller should hold session s_mutex and dentry->d_lock.
1094 */
__update_dentry_lease(struct inode * dir,struct dentry * dentry,struct ceph_mds_reply_lease * lease,struct ceph_mds_session * session,unsigned long from_time,struct ceph_mds_session ** old_lease_session)1095 static void __update_dentry_lease(struct inode *dir, struct dentry *dentry,
1096 struct ceph_mds_reply_lease *lease,
1097 struct ceph_mds_session *session,
1098 unsigned long from_time,
1099 struct ceph_mds_session **old_lease_session)
1100 {
1101 struct ceph_dentry_info *di = ceph_dentry(dentry);
1102 unsigned mask = le16_to_cpu(lease->mask);
1103 long unsigned duration = le32_to_cpu(lease->duration_ms);
1104 long unsigned ttl = from_time + (duration * HZ) / 1000;
1105 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
1106
1107 dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
1108 dentry, duration, ttl);
1109
1110 /* only track leases on regular dentries */
1111 if (ceph_snap(dir) != CEPH_NOSNAP)
1112 return;
1113
1114 if (mask & CEPH_LEASE_PRIMARY_LINK)
1115 di->flags |= CEPH_DENTRY_PRIMARY_LINK;
1116 else
1117 di->flags &= ~CEPH_DENTRY_PRIMARY_LINK;
1118
1119 di->lease_shared_gen = atomic_read(&ceph_inode(dir)->i_shared_gen);
1120 if (!(mask & CEPH_LEASE_VALID)) {
1121 __ceph_dentry_dir_lease_touch(di);
1122 return;
1123 }
1124
1125 if (di->lease_gen == session->s_cap_gen &&
1126 time_before(ttl, di->time))
1127 return; /* we already have a newer lease. */
1128
1129 if (di->lease_session && di->lease_session != session) {
1130 *old_lease_session = di->lease_session;
1131 di->lease_session = NULL;
1132 }
1133
1134 if (!di->lease_session)
1135 di->lease_session = ceph_get_mds_session(session);
1136 di->lease_gen = session->s_cap_gen;
1137 di->lease_seq = le32_to_cpu(lease->seq);
1138 di->lease_renew_after = half_ttl;
1139 di->lease_renew_from = 0;
1140 di->time = ttl;
1141
1142 __ceph_dentry_lease_touch(di);
1143 }
1144
update_dentry_lease(struct inode * dir,struct dentry * dentry,struct ceph_mds_reply_lease * lease,struct ceph_mds_session * session,unsigned long from_time)1145 static inline void update_dentry_lease(struct inode *dir, struct dentry *dentry,
1146 struct ceph_mds_reply_lease *lease,
1147 struct ceph_mds_session *session,
1148 unsigned long from_time)
1149 {
1150 struct ceph_mds_session *old_lease_session = NULL;
1151 spin_lock(&dentry->d_lock);
1152 __update_dentry_lease(dir, dentry, lease, session, from_time,
1153 &old_lease_session);
1154 spin_unlock(&dentry->d_lock);
1155 if (old_lease_session)
1156 ceph_put_mds_session(old_lease_session);
1157 }
1158
1159 /*
1160 * update dentry lease without having parent inode locked
1161 */
update_dentry_lease_careful(struct dentry * dentry,struct ceph_mds_reply_lease * lease,struct ceph_mds_session * session,unsigned long from_time,char * dname,u32 dname_len,struct ceph_vino * pdvino,struct ceph_vino * ptvino)1162 static void update_dentry_lease_careful(struct dentry *dentry,
1163 struct ceph_mds_reply_lease *lease,
1164 struct ceph_mds_session *session,
1165 unsigned long from_time,
1166 char *dname, u32 dname_len,
1167 struct ceph_vino *pdvino,
1168 struct ceph_vino *ptvino)
1169
1170 {
1171 struct inode *dir;
1172 struct ceph_mds_session *old_lease_session = NULL;
1173
1174 spin_lock(&dentry->d_lock);
1175 /* make sure dentry's name matches target */
1176 if (dentry->d_name.len != dname_len ||
1177 memcmp(dentry->d_name.name, dname, dname_len))
1178 goto out_unlock;
1179
1180 dir = d_inode(dentry->d_parent);
1181 /* make sure parent matches dvino */
1182 if (!ceph_ino_compare(dir, pdvino))
1183 goto out_unlock;
1184
1185 /* make sure dentry's inode matches target. NULL ptvino means that
1186 * we expect a negative dentry */
1187 if (ptvino) {
1188 if (d_really_is_negative(dentry))
1189 goto out_unlock;
1190 if (!ceph_ino_compare(d_inode(dentry), ptvino))
1191 goto out_unlock;
1192 } else {
1193 if (d_really_is_positive(dentry))
1194 goto out_unlock;
1195 }
1196
1197 __update_dentry_lease(dir, dentry, lease, session,
1198 from_time, &old_lease_session);
1199 out_unlock:
1200 spin_unlock(&dentry->d_lock);
1201 if (old_lease_session)
1202 ceph_put_mds_session(old_lease_session);
1203 }
1204
1205 /*
1206 * splice a dentry to an inode.
1207 * caller must hold directory i_mutex for this to be safe.
1208 */
splice_dentry(struct dentry ** pdn,struct inode * in)1209 static int splice_dentry(struct dentry **pdn, struct inode *in)
1210 {
1211 struct dentry *dn = *pdn;
1212 struct dentry *realdn;
1213
1214 BUG_ON(d_inode(dn));
1215
1216 if (S_ISDIR(in->i_mode)) {
1217 /* If inode is directory, d_splice_alias() below will remove
1218 * 'realdn' from its origin parent. We need to ensure that
1219 * origin parent's readdir cache will not reference 'realdn'
1220 */
1221 realdn = d_find_any_alias(in);
1222 if (realdn) {
1223 struct ceph_dentry_info *di = ceph_dentry(realdn);
1224 spin_lock(&realdn->d_lock);
1225
1226 realdn->d_op->d_prune(realdn);
1227
1228 di->time = jiffies;
1229 di->lease_shared_gen = 0;
1230 di->offset = 0;
1231
1232 spin_unlock(&realdn->d_lock);
1233 dput(realdn);
1234 }
1235 }
1236
1237 /* dn must be unhashed */
1238 if (!d_unhashed(dn))
1239 d_drop(dn);
1240 realdn = d_splice_alias(in, dn);
1241 if (IS_ERR(realdn)) {
1242 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
1243 PTR_ERR(realdn), dn, in, ceph_vinop(in));
1244 return PTR_ERR(realdn);
1245 }
1246
1247 if (realdn) {
1248 dout("dn %p (%d) spliced with %p (%d) "
1249 "inode %p ino %llx.%llx\n",
1250 dn, d_count(dn),
1251 realdn, d_count(realdn),
1252 d_inode(realdn), ceph_vinop(d_inode(realdn)));
1253 dput(dn);
1254 *pdn = realdn;
1255 } else {
1256 BUG_ON(!ceph_dentry(dn));
1257 dout("dn %p attached to %p ino %llx.%llx\n",
1258 dn, d_inode(dn), ceph_vinop(d_inode(dn)));
1259 }
1260 return 0;
1261 }
1262
1263 /*
1264 * Incorporate results into the local cache. This is either just
1265 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1266 * after a lookup).
1267 *
1268 * A reply may contain
1269 * a directory inode along with a dentry.
1270 * and/or a target inode
1271 *
1272 * Called with snap_rwsem (read).
1273 */
ceph_fill_trace(struct super_block * sb,struct ceph_mds_request * req)1274 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
1275 {
1276 struct ceph_mds_session *session = req->r_session;
1277 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1278 struct inode *in = NULL;
1279 struct ceph_vino tvino, dvino;
1280 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1281 int err = 0;
1282
1283 dout("fill_trace %p is_dentry %d is_target %d\n", req,
1284 rinfo->head->is_dentry, rinfo->head->is_target);
1285
1286 if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1287 dout("fill_trace reply is empty!\n");
1288 if (rinfo->head->result == 0 && req->r_parent)
1289 ceph_invalidate_dir_request(req);
1290 return 0;
1291 }
1292
1293 if (rinfo->head->is_dentry) {
1294 struct inode *dir = req->r_parent;
1295
1296 if (dir) {
1297 err = ceph_fill_inode(dir, NULL, &rinfo->diri,
1298 rinfo->dirfrag, session, -1,
1299 &req->r_caps_reservation);
1300 if (err < 0)
1301 goto done;
1302 } else {
1303 WARN_ON_ONCE(1);
1304 }
1305
1306 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME &&
1307 test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1308 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1309 struct qstr dname;
1310 struct dentry *dn, *parent;
1311
1312 BUG_ON(!rinfo->head->is_target);
1313 BUG_ON(req->r_dentry);
1314
1315 parent = d_find_any_alias(dir);
1316 BUG_ON(!parent);
1317
1318 dname.name = rinfo->dname;
1319 dname.len = rinfo->dname_len;
1320 dname.hash = full_name_hash(parent, dname.name, dname.len);
1321 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1322 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1323 retry_lookup:
1324 dn = d_lookup(parent, &dname);
1325 dout("d_lookup on parent=%p name=%.*s got %p\n",
1326 parent, dname.len, dname.name, dn);
1327
1328 if (!dn) {
1329 dn = d_alloc(parent, &dname);
1330 dout("d_alloc %p '%.*s' = %p\n", parent,
1331 dname.len, dname.name, dn);
1332 if (!dn) {
1333 dput(parent);
1334 err = -ENOMEM;
1335 goto done;
1336 }
1337 err = 0;
1338 } else if (d_really_is_positive(dn) &&
1339 (ceph_ino(d_inode(dn)) != tvino.ino ||
1340 ceph_snap(d_inode(dn)) != tvino.snap)) {
1341 dout(" dn %p points to wrong inode %p\n",
1342 dn, d_inode(dn));
1343 ceph_dir_clear_ordered(dir);
1344 d_delete(dn);
1345 dput(dn);
1346 goto retry_lookup;
1347 }
1348
1349 req->r_dentry = dn;
1350 dput(parent);
1351 }
1352 }
1353
1354 if (rinfo->head->is_target) {
1355 /* Should be filled in by handle_reply */
1356 BUG_ON(!req->r_target_inode);
1357
1358 in = req->r_target_inode;
1359 err = ceph_fill_inode(in, req->r_locked_page, &rinfo->targeti,
1360 NULL, session,
1361 (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1362 !test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) &&
1363 rinfo->head->result == 0) ? req->r_fmode : -1,
1364 &req->r_caps_reservation);
1365 if (err < 0) {
1366 pr_err("ceph_fill_inode badness %p %llx.%llx\n",
1367 in, ceph_vinop(in));
1368 req->r_target_inode = NULL;
1369 if (in->i_state & I_NEW)
1370 discard_new_inode(in);
1371 else
1372 iput(in);
1373 goto done;
1374 }
1375 if (in->i_state & I_NEW)
1376 unlock_new_inode(in);
1377 }
1378
1379 /*
1380 * ignore null lease/binding on snapdir ENOENT, or else we
1381 * will have trouble splicing in the virtual snapdir later
1382 */
1383 if (rinfo->head->is_dentry &&
1384 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1385 test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1386 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1387 fsc->mount_options->snapdir_name,
1388 req->r_dentry->d_name.len))) {
1389 /*
1390 * lookup link rename : null -> possibly existing inode
1391 * mknod symlink mkdir : null -> new inode
1392 * unlink : linked -> null
1393 */
1394 struct inode *dir = req->r_parent;
1395 struct dentry *dn = req->r_dentry;
1396 bool have_dir_cap, have_lease;
1397
1398 BUG_ON(!dn);
1399 BUG_ON(!dir);
1400 BUG_ON(d_inode(dn->d_parent) != dir);
1401
1402 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1403 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1404
1405 BUG_ON(ceph_ino(dir) != dvino.ino);
1406 BUG_ON(ceph_snap(dir) != dvino.snap);
1407
1408 /* do we have a lease on the whole dir? */
1409 have_dir_cap =
1410 (le32_to_cpu(rinfo->diri.in->cap.caps) &
1411 CEPH_CAP_FILE_SHARED);
1412
1413 /* do we have a dn lease? */
1414 have_lease = have_dir_cap ||
1415 le32_to_cpu(rinfo->dlease->duration_ms);
1416 if (!have_lease)
1417 dout("fill_trace no dentry lease or dir cap\n");
1418
1419 /* rename? */
1420 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1421 struct inode *olddir = req->r_old_dentry_dir;
1422 BUG_ON(!olddir);
1423
1424 dout(" src %p '%pd' dst %p '%pd'\n",
1425 req->r_old_dentry,
1426 req->r_old_dentry,
1427 dn, dn);
1428 dout("fill_trace doing d_move %p -> %p\n",
1429 req->r_old_dentry, dn);
1430
1431 /* d_move screws up sibling dentries' offsets */
1432 ceph_dir_clear_ordered(dir);
1433 ceph_dir_clear_ordered(olddir);
1434
1435 d_move(req->r_old_dentry, dn);
1436 dout(" src %p '%pd' dst %p '%pd'\n",
1437 req->r_old_dentry,
1438 req->r_old_dentry,
1439 dn, dn);
1440
1441 /* ensure target dentry is invalidated, despite
1442 rehashing bug in vfs_rename_dir */
1443 ceph_invalidate_dentry_lease(dn);
1444
1445 dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1446 ceph_dentry(req->r_old_dentry)->offset);
1447
1448 /* swap r_dentry and r_old_dentry in case that
1449 * splice_dentry() gets called later. This is safe
1450 * because no other place will use them */
1451 req->r_dentry = req->r_old_dentry;
1452 req->r_old_dentry = dn;
1453 dn = req->r_dentry;
1454 }
1455
1456 /* null dentry? */
1457 if (!rinfo->head->is_target) {
1458 dout("fill_trace null dentry\n");
1459 if (d_really_is_positive(dn)) {
1460 dout("d_delete %p\n", dn);
1461 ceph_dir_clear_ordered(dir);
1462 d_delete(dn);
1463 } else if (have_lease) {
1464 if (d_unhashed(dn))
1465 d_add(dn, NULL);
1466 update_dentry_lease(dir, dn,
1467 rinfo->dlease, session,
1468 req->r_request_started);
1469 }
1470 goto done;
1471 }
1472
1473 /* attach proper inode */
1474 if (d_really_is_negative(dn)) {
1475 ceph_dir_clear_ordered(dir);
1476 ihold(in);
1477 err = splice_dentry(&req->r_dentry, in);
1478 if (err < 0)
1479 goto done;
1480 dn = req->r_dentry; /* may have spliced */
1481 } else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1482 dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1483 dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1484 ceph_vinop(in));
1485 d_invalidate(dn);
1486 have_lease = false;
1487 }
1488
1489 if (have_lease) {
1490 update_dentry_lease(dir, dn,
1491 rinfo->dlease, session,
1492 req->r_request_started);
1493 }
1494 dout(" final dn %p\n", dn);
1495 } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1496 req->r_op == CEPH_MDS_OP_MKSNAP) &&
1497 test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1498 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1499 struct inode *dir = req->r_parent;
1500
1501 /* fill out a snapdir LOOKUPSNAP dentry */
1502 BUG_ON(!dir);
1503 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1504 BUG_ON(!req->r_dentry);
1505 dout(" linking snapped dir %p to dn %p\n", in, req->r_dentry);
1506 ceph_dir_clear_ordered(dir);
1507 ihold(in);
1508 err = splice_dentry(&req->r_dentry, in);
1509 if (err < 0)
1510 goto done;
1511 } else if (rinfo->head->is_dentry && req->r_dentry) {
1512 /* parent inode is not locked, be carefull */
1513 struct ceph_vino *ptvino = NULL;
1514 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1515 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1516 if (rinfo->head->is_target) {
1517 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1518 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1519 ptvino = &tvino;
1520 }
1521 update_dentry_lease_careful(req->r_dentry, rinfo->dlease,
1522 session, req->r_request_started,
1523 rinfo->dname, rinfo->dname_len,
1524 &dvino, ptvino);
1525 }
1526 done:
1527 dout("fill_trace done err=%d\n", err);
1528 return err;
1529 }
1530
1531 /*
1532 * Prepopulate our cache with readdir results, leases, etc.
1533 */
readdir_prepopulate_inodes_only(struct ceph_mds_request * req,struct ceph_mds_session * session)1534 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1535 struct ceph_mds_session *session)
1536 {
1537 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1538 int i, err = 0;
1539
1540 for (i = 0; i < rinfo->dir_nr; i++) {
1541 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1542 struct ceph_vino vino;
1543 struct inode *in;
1544 int rc;
1545
1546 vino.ino = le64_to_cpu(rde->inode.in->ino);
1547 vino.snap = le64_to_cpu(rde->inode.in->snapid);
1548
1549 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1550 if (IS_ERR(in)) {
1551 err = PTR_ERR(in);
1552 dout("new_inode badness got %d\n", err);
1553 continue;
1554 }
1555 rc = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
1556 -1, &req->r_caps_reservation);
1557 if (rc < 0) {
1558 pr_err("ceph_fill_inode badness on %p got %d\n",
1559 in, rc);
1560 err = rc;
1561 if (in->i_state & I_NEW) {
1562 ihold(in);
1563 discard_new_inode(in);
1564 }
1565 } else if (in->i_state & I_NEW) {
1566 unlock_new_inode(in);
1567 }
1568
1569 /* avoid calling iput_final() in mds dispatch threads */
1570 ceph_async_iput(in);
1571 }
1572
1573 return err;
1574 }
1575
ceph_readdir_cache_release(struct ceph_readdir_cache_control * ctl)1576 void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1577 {
1578 if (ctl->page) {
1579 kunmap(ctl->page);
1580 put_page(ctl->page);
1581 ctl->page = NULL;
1582 }
1583 }
1584
fill_readdir_cache(struct inode * dir,struct dentry * dn,struct ceph_readdir_cache_control * ctl,struct ceph_mds_request * req)1585 static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1586 struct ceph_readdir_cache_control *ctl,
1587 struct ceph_mds_request *req)
1588 {
1589 struct ceph_inode_info *ci = ceph_inode(dir);
1590 unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
1591 unsigned idx = ctl->index % nsize;
1592 pgoff_t pgoff = ctl->index / nsize;
1593
1594 if (!ctl->page || pgoff != page_index(ctl->page)) {
1595 ceph_readdir_cache_release(ctl);
1596 if (idx == 0)
1597 ctl->page = grab_cache_page(&dir->i_data, pgoff);
1598 else
1599 ctl->page = find_lock_page(&dir->i_data, pgoff);
1600 if (!ctl->page) {
1601 ctl->index = -1;
1602 return idx == 0 ? -ENOMEM : 0;
1603 }
1604 /* reading/filling the cache are serialized by
1605 * i_mutex, no need to use page lock */
1606 unlock_page(ctl->page);
1607 ctl->dentries = kmap(ctl->page);
1608 if (idx == 0)
1609 memset(ctl->dentries, 0, PAGE_SIZE);
1610 }
1611
1612 if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1613 req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1614 dout("readdir cache dn %p idx %d\n", dn, ctl->index);
1615 ctl->dentries[idx] = dn;
1616 ctl->index++;
1617 } else {
1618 dout("disable readdir cache\n");
1619 ctl->index = -1;
1620 }
1621 return 0;
1622 }
1623
ceph_readdir_prepopulate(struct ceph_mds_request * req,struct ceph_mds_session * session)1624 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1625 struct ceph_mds_session *session)
1626 {
1627 struct dentry *parent = req->r_dentry;
1628 struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
1629 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1630 struct qstr dname;
1631 struct dentry *dn;
1632 struct inode *in;
1633 int err = 0, skipped = 0, ret, i;
1634 u32 frag = le32_to_cpu(req->r_args.readdir.frag);
1635 u32 last_hash = 0;
1636 u32 fpos_offset;
1637 struct ceph_readdir_cache_control cache_ctl = {};
1638
1639 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
1640 return readdir_prepopulate_inodes_only(req, session);
1641
1642 if (rinfo->hash_order) {
1643 if (req->r_path2) {
1644 last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1645 req->r_path2,
1646 strlen(req->r_path2));
1647 last_hash = ceph_frag_value(last_hash);
1648 } else if (rinfo->offset_hash) {
1649 /* mds understands offset_hash */
1650 WARN_ON_ONCE(req->r_readdir_offset != 2);
1651 last_hash = le32_to_cpu(req->r_args.readdir.offset_hash);
1652 }
1653 }
1654
1655 if (rinfo->dir_dir &&
1656 le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1657 dout("readdir_prepopulate got new frag %x -> %x\n",
1658 frag, le32_to_cpu(rinfo->dir_dir->frag));
1659 frag = le32_to_cpu(rinfo->dir_dir->frag);
1660 if (!rinfo->hash_order)
1661 req->r_readdir_offset = 2;
1662 }
1663
1664 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1665 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1666 rinfo->dir_nr, parent);
1667 } else {
1668 dout("readdir_prepopulate %d items under dn %p\n",
1669 rinfo->dir_nr, parent);
1670 if (rinfo->dir_dir)
1671 ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1672
1673 if (ceph_frag_is_leftmost(frag) &&
1674 req->r_readdir_offset == 2 &&
1675 !(rinfo->hash_order && last_hash)) {
1676 /* note dir version at start of readdir so we can
1677 * tell if any dentries get dropped */
1678 req->r_dir_release_cnt =
1679 atomic64_read(&ci->i_release_count);
1680 req->r_dir_ordered_cnt =
1681 atomic64_read(&ci->i_ordered_count);
1682 req->r_readdir_cache_idx = 0;
1683 }
1684 }
1685
1686 cache_ctl.index = req->r_readdir_cache_idx;
1687 fpos_offset = req->r_readdir_offset;
1688
1689 /* FIXME: release caps/leases if error occurs */
1690 for (i = 0; i < rinfo->dir_nr; i++) {
1691 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1692 struct ceph_vino tvino;
1693
1694 dname.name = rde->name;
1695 dname.len = rde->name_len;
1696 dname.hash = full_name_hash(parent, dname.name, dname.len);
1697
1698 tvino.ino = le64_to_cpu(rde->inode.in->ino);
1699 tvino.snap = le64_to_cpu(rde->inode.in->snapid);
1700
1701 if (rinfo->hash_order) {
1702 u32 hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1703 rde->name, rde->name_len);
1704 hash = ceph_frag_value(hash);
1705 if (hash != last_hash)
1706 fpos_offset = 2;
1707 last_hash = hash;
1708 rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
1709 } else {
1710 rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
1711 }
1712
1713 retry_lookup:
1714 dn = d_lookup(parent, &dname);
1715 dout("d_lookup on parent=%p name=%.*s got %p\n",
1716 parent, dname.len, dname.name, dn);
1717
1718 if (!dn) {
1719 dn = d_alloc(parent, &dname);
1720 dout("d_alloc %p '%.*s' = %p\n", parent,
1721 dname.len, dname.name, dn);
1722 if (!dn) {
1723 dout("d_alloc badness\n");
1724 err = -ENOMEM;
1725 goto out;
1726 }
1727 } else if (d_really_is_positive(dn) &&
1728 (ceph_ino(d_inode(dn)) != tvino.ino ||
1729 ceph_snap(d_inode(dn)) != tvino.snap)) {
1730 struct ceph_dentry_info *di = ceph_dentry(dn);
1731 dout(" dn %p points to wrong inode %p\n",
1732 dn, d_inode(dn));
1733
1734 spin_lock(&dn->d_lock);
1735 if (di->offset > 0 &&
1736 di->lease_shared_gen ==
1737 atomic_read(&ci->i_shared_gen)) {
1738 __ceph_dir_clear_ordered(ci);
1739 di->offset = 0;
1740 }
1741 spin_unlock(&dn->d_lock);
1742
1743 d_delete(dn);
1744 dput(dn);
1745 goto retry_lookup;
1746 }
1747
1748 /* inode */
1749 if (d_really_is_positive(dn)) {
1750 in = d_inode(dn);
1751 } else {
1752 in = ceph_get_inode(parent->d_sb, tvino);
1753 if (IS_ERR(in)) {
1754 dout("new_inode badness\n");
1755 d_drop(dn);
1756 dput(dn);
1757 err = PTR_ERR(in);
1758 goto out;
1759 }
1760 }
1761
1762 ret = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
1763 -1, &req->r_caps_reservation);
1764 if (ret < 0) {
1765 pr_err("ceph_fill_inode badness on %p\n", in);
1766 if (d_really_is_negative(dn)) {
1767 /* avoid calling iput_final() in mds
1768 * dispatch threads */
1769 if (in->i_state & I_NEW) {
1770 ihold(in);
1771 discard_new_inode(in);
1772 }
1773 ceph_async_iput(in);
1774 }
1775 d_drop(dn);
1776 err = ret;
1777 goto next_item;
1778 }
1779 if (in->i_state & I_NEW)
1780 unlock_new_inode(in);
1781
1782 if (d_really_is_negative(dn)) {
1783 if (ceph_security_xattr_deadlock(in)) {
1784 dout(" skip splicing dn %p to inode %p"
1785 " (security xattr deadlock)\n", dn, in);
1786 ceph_async_iput(in);
1787 skipped++;
1788 goto next_item;
1789 }
1790
1791 err = splice_dentry(&dn, in);
1792 if (err < 0)
1793 goto next_item;
1794 }
1795
1796 ceph_dentry(dn)->offset = rde->offset;
1797
1798 update_dentry_lease(d_inode(parent), dn,
1799 rde->lease, req->r_session,
1800 req->r_request_started);
1801
1802 if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
1803 ret = fill_readdir_cache(d_inode(parent), dn,
1804 &cache_ctl, req);
1805 if (ret < 0)
1806 err = ret;
1807 }
1808 next_item:
1809 dput(dn);
1810 }
1811 out:
1812 if (err == 0 && skipped == 0) {
1813 set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
1814 req->r_readdir_cache_idx = cache_ctl.index;
1815 }
1816 ceph_readdir_cache_release(&cache_ctl);
1817 dout("readdir_prepopulate done\n");
1818 return err;
1819 }
1820
ceph_inode_set_size(struct inode * inode,loff_t size)1821 bool ceph_inode_set_size(struct inode *inode, loff_t size)
1822 {
1823 struct ceph_inode_info *ci = ceph_inode(inode);
1824 bool ret;
1825
1826 spin_lock(&ci->i_ceph_lock);
1827 dout("set_size %p %llu -> %llu\n", inode, i_size_read(inode), size);
1828 i_size_write(inode, size);
1829 inode->i_blocks = calc_inode_blocks(size);
1830
1831 ret = __ceph_should_report_size(ci);
1832
1833 spin_unlock(&ci->i_ceph_lock);
1834 return ret;
1835 }
1836
1837 /*
1838 * Put reference to inode, but avoid calling iput_final() in current thread.
1839 * iput_final() may wait for reahahead pages. The wait can cause deadlock in
1840 * some contexts.
1841 */
ceph_async_iput(struct inode * inode)1842 void ceph_async_iput(struct inode *inode)
1843 {
1844 if (!inode)
1845 return;
1846 for (;;) {
1847 if (atomic_add_unless(&inode->i_count, -1, 1))
1848 break;
1849 if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1850 &ceph_inode(inode)->i_work))
1851 break;
1852 /* queue work failed, i_count must be at least 2 */
1853 }
1854 }
1855
ceph_queue_inode_work(struct inode * inode,int work_bit)1856 void ceph_queue_inode_work(struct inode *inode, int work_bit)
1857 {
1858 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1859 struct ceph_inode_info *ci = ceph_inode(inode);
1860 set_bit(work_bit, &ci->i_work_mask);
1861
1862 ihold(inode);
1863 if (queue_work(fsc->inode_wq, &ci->i_work)) {
1864 dout("queue_inode_work %p, mask=%lx\n", inode, ci->i_work_mask);
1865 } else {
1866 dout("queue_inode_work %p already queued, mask=%lx\n",
1867 inode, ci->i_work_mask);
1868 iput(inode);
1869 }
1870 }
1871
ceph_do_invalidate_pages(struct inode * inode)1872 static void ceph_do_invalidate_pages(struct inode *inode)
1873 {
1874 struct ceph_inode_info *ci = ceph_inode(inode);
1875 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1876 u32 orig_gen;
1877 int check = 0;
1878
1879 mutex_lock(&ci->i_truncate_mutex);
1880
1881 if (READ_ONCE(fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN) {
1882 pr_warn_ratelimited("invalidate_pages %p %lld forced umount\n",
1883 inode, ceph_ino(inode));
1884 mapping_set_error(inode->i_mapping, -EIO);
1885 truncate_pagecache(inode, 0);
1886 mutex_unlock(&ci->i_truncate_mutex);
1887 goto out;
1888 }
1889
1890 spin_lock(&ci->i_ceph_lock);
1891 dout("invalidate_pages %p gen %d revoking %d\n", inode,
1892 ci->i_rdcache_gen, ci->i_rdcache_revoking);
1893 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1894 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1895 check = 1;
1896 spin_unlock(&ci->i_ceph_lock);
1897 mutex_unlock(&ci->i_truncate_mutex);
1898 goto out;
1899 }
1900 orig_gen = ci->i_rdcache_gen;
1901 spin_unlock(&ci->i_ceph_lock);
1902
1903 ceph_fscache_invalidate(inode);
1904 if (invalidate_inode_pages2(inode->i_mapping) < 0) {
1905 pr_err("invalidate_pages %p fails\n", inode);
1906 }
1907
1908 spin_lock(&ci->i_ceph_lock);
1909 if (orig_gen == ci->i_rdcache_gen &&
1910 orig_gen == ci->i_rdcache_revoking) {
1911 dout("invalidate_pages %p gen %d successful\n", inode,
1912 ci->i_rdcache_gen);
1913 ci->i_rdcache_revoking--;
1914 check = 1;
1915 } else {
1916 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1917 inode, orig_gen, ci->i_rdcache_gen,
1918 ci->i_rdcache_revoking);
1919 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1920 check = 1;
1921 }
1922 spin_unlock(&ci->i_ceph_lock);
1923 mutex_unlock(&ci->i_truncate_mutex);
1924 out:
1925 if (check)
1926 ceph_check_caps(ci, 0, NULL);
1927 }
1928
1929 /*
1930 * Make sure any pending truncation is applied before doing anything
1931 * that may depend on it.
1932 */
__ceph_do_pending_vmtruncate(struct inode * inode)1933 void __ceph_do_pending_vmtruncate(struct inode *inode)
1934 {
1935 struct ceph_inode_info *ci = ceph_inode(inode);
1936 u64 to;
1937 int wrbuffer_refs, finish = 0;
1938
1939 mutex_lock(&ci->i_truncate_mutex);
1940 retry:
1941 spin_lock(&ci->i_ceph_lock);
1942 if (ci->i_truncate_pending == 0) {
1943 dout("__do_pending_vmtruncate %p none pending\n", inode);
1944 spin_unlock(&ci->i_ceph_lock);
1945 mutex_unlock(&ci->i_truncate_mutex);
1946 return;
1947 }
1948
1949 /*
1950 * make sure any dirty snapped pages are flushed before we
1951 * possibly truncate them.. so write AND block!
1952 */
1953 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1954 spin_unlock(&ci->i_ceph_lock);
1955 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1956 inode);
1957 filemap_write_and_wait_range(&inode->i_data, 0,
1958 inode->i_sb->s_maxbytes);
1959 goto retry;
1960 }
1961
1962 /* there should be no reader or writer */
1963 WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1964
1965 to = ci->i_truncate_size;
1966 wrbuffer_refs = ci->i_wrbuffer_ref;
1967 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1968 ci->i_truncate_pending, to);
1969 spin_unlock(&ci->i_ceph_lock);
1970
1971 truncate_pagecache(inode, to);
1972
1973 spin_lock(&ci->i_ceph_lock);
1974 if (to == ci->i_truncate_size) {
1975 ci->i_truncate_pending = 0;
1976 finish = 1;
1977 }
1978 spin_unlock(&ci->i_ceph_lock);
1979 if (!finish)
1980 goto retry;
1981
1982 mutex_unlock(&ci->i_truncate_mutex);
1983
1984 if (wrbuffer_refs == 0)
1985 ceph_check_caps(ci, 0, NULL);
1986
1987 wake_up_all(&ci->i_cap_wq);
1988 }
1989
ceph_inode_work(struct work_struct * work)1990 static void ceph_inode_work(struct work_struct *work)
1991 {
1992 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1993 i_work);
1994 struct inode *inode = &ci->vfs_inode;
1995
1996 if (test_and_clear_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask)) {
1997 dout("writeback %p\n", inode);
1998 filemap_fdatawrite(&inode->i_data);
1999 }
2000 if (test_and_clear_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask))
2001 ceph_do_invalidate_pages(inode);
2002
2003 if (test_and_clear_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask))
2004 __ceph_do_pending_vmtruncate(inode);
2005
2006 if (test_and_clear_bit(CEPH_I_WORK_CHECK_CAPS, &ci->i_work_mask))
2007 ceph_check_caps(ci, 0, NULL);
2008
2009 if (test_and_clear_bit(CEPH_I_WORK_FLUSH_SNAPS, &ci->i_work_mask))
2010 ceph_flush_snaps(ci, NULL);
2011
2012 iput(inode);
2013 }
2014
2015 /*
2016 * symlinks
2017 */
2018 static const struct inode_operations ceph_symlink_iops = {
2019 .get_link = simple_get_link,
2020 .setattr = ceph_setattr,
2021 .getattr = ceph_getattr,
2022 .listxattr = ceph_listxattr,
2023 };
2024
__ceph_setattr(struct inode * inode,struct iattr * attr)2025 int __ceph_setattr(struct inode *inode, struct iattr *attr)
2026 {
2027 struct ceph_inode_info *ci = ceph_inode(inode);
2028 unsigned int ia_valid = attr->ia_valid;
2029 struct ceph_mds_request *req;
2030 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
2031 struct ceph_cap_flush *prealloc_cf;
2032 int issued;
2033 int release = 0, dirtied = 0;
2034 int mask = 0;
2035 int err = 0;
2036 int inode_dirty_flags = 0;
2037 bool lock_snap_rwsem = false;
2038
2039 prealloc_cf = ceph_alloc_cap_flush();
2040 if (!prealloc_cf)
2041 return -ENOMEM;
2042
2043 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
2044 USE_AUTH_MDS);
2045 if (IS_ERR(req)) {
2046 ceph_free_cap_flush(prealloc_cf);
2047 return PTR_ERR(req);
2048 }
2049
2050 spin_lock(&ci->i_ceph_lock);
2051 issued = __ceph_caps_issued(ci, NULL);
2052
2053 if (!ci->i_head_snapc &&
2054 (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
2055 lock_snap_rwsem = true;
2056 if (!down_read_trylock(&mdsc->snap_rwsem)) {
2057 spin_unlock(&ci->i_ceph_lock);
2058 down_read(&mdsc->snap_rwsem);
2059 spin_lock(&ci->i_ceph_lock);
2060 issued = __ceph_caps_issued(ci, NULL);
2061 }
2062 }
2063
2064 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
2065
2066 if (ia_valid & ATTR_UID) {
2067 dout("setattr %p uid %d -> %d\n", inode,
2068 from_kuid(&init_user_ns, inode->i_uid),
2069 from_kuid(&init_user_ns, attr->ia_uid));
2070 if (issued & CEPH_CAP_AUTH_EXCL) {
2071 inode->i_uid = attr->ia_uid;
2072 dirtied |= CEPH_CAP_AUTH_EXCL;
2073 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2074 !uid_eq(attr->ia_uid, inode->i_uid)) {
2075 req->r_args.setattr.uid = cpu_to_le32(
2076 from_kuid(&init_user_ns, attr->ia_uid));
2077 mask |= CEPH_SETATTR_UID;
2078 release |= CEPH_CAP_AUTH_SHARED;
2079 }
2080 }
2081 if (ia_valid & ATTR_GID) {
2082 dout("setattr %p gid %d -> %d\n", inode,
2083 from_kgid(&init_user_ns, inode->i_gid),
2084 from_kgid(&init_user_ns, attr->ia_gid));
2085 if (issued & CEPH_CAP_AUTH_EXCL) {
2086 inode->i_gid = attr->ia_gid;
2087 dirtied |= CEPH_CAP_AUTH_EXCL;
2088 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2089 !gid_eq(attr->ia_gid, inode->i_gid)) {
2090 req->r_args.setattr.gid = cpu_to_le32(
2091 from_kgid(&init_user_ns, attr->ia_gid));
2092 mask |= CEPH_SETATTR_GID;
2093 release |= CEPH_CAP_AUTH_SHARED;
2094 }
2095 }
2096 if (ia_valid & ATTR_MODE) {
2097 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
2098 attr->ia_mode);
2099 if (issued & CEPH_CAP_AUTH_EXCL) {
2100 inode->i_mode = attr->ia_mode;
2101 dirtied |= CEPH_CAP_AUTH_EXCL;
2102 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2103 attr->ia_mode != inode->i_mode) {
2104 inode->i_mode = attr->ia_mode;
2105 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
2106 mask |= CEPH_SETATTR_MODE;
2107 release |= CEPH_CAP_AUTH_SHARED;
2108 }
2109 }
2110
2111 if (ia_valid & ATTR_ATIME) {
2112 dout("setattr %p atime %lld.%ld -> %lld.%ld\n", inode,
2113 inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
2114 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
2115 if (issued & CEPH_CAP_FILE_EXCL) {
2116 ci->i_time_warp_seq++;
2117 inode->i_atime = attr->ia_atime;
2118 dirtied |= CEPH_CAP_FILE_EXCL;
2119 } else if ((issued & CEPH_CAP_FILE_WR) &&
2120 timespec64_compare(&inode->i_atime,
2121 &attr->ia_atime) < 0) {
2122 inode->i_atime = attr->ia_atime;
2123 dirtied |= CEPH_CAP_FILE_WR;
2124 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2125 !timespec64_equal(&inode->i_atime, &attr->ia_atime)) {
2126 ceph_encode_timespec64(&req->r_args.setattr.atime,
2127 &attr->ia_atime);
2128 mask |= CEPH_SETATTR_ATIME;
2129 release |= CEPH_CAP_FILE_SHARED |
2130 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2131 }
2132 }
2133 if (ia_valid & ATTR_SIZE) {
2134 loff_t isize = i_size_read(inode);
2135
2136 dout("setattr %p size %lld -> %lld\n", inode, isize, attr->ia_size);
2137 if ((issued & CEPH_CAP_FILE_EXCL) && attr->ia_size > isize) {
2138 i_size_write(inode, attr->ia_size);
2139 inode->i_blocks = calc_inode_blocks(attr->ia_size);
2140 ci->i_reported_size = attr->ia_size;
2141 dirtied |= CEPH_CAP_FILE_EXCL;
2142 ia_valid |= ATTR_MTIME;
2143 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2144 attr->ia_size != isize) {
2145 req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
2146 req->r_args.setattr.old_size = cpu_to_le64(isize);
2147 mask |= CEPH_SETATTR_SIZE;
2148 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2149 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2150 }
2151 }
2152 if (ia_valid & ATTR_MTIME) {
2153 dout("setattr %p mtime %lld.%ld -> %lld.%ld\n", inode,
2154 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
2155 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
2156 if (issued & CEPH_CAP_FILE_EXCL) {
2157 ci->i_time_warp_seq++;
2158 inode->i_mtime = attr->ia_mtime;
2159 dirtied |= CEPH_CAP_FILE_EXCL;
2160 } else if ((issued & CEPH_CAP_FILE_WR) &&
2161 timespec64_compare(&inode->i_mtime,
2162 &attr->ia_mtime) < 0) {
2163 inode->i_mtime = attr->ia_mtime;
2164 dirtied |= CEPH_CAP_FILE_WR;
2165 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2166 !timespec64_equal(&inode->i_mtime, &attr->ia_mtime)) {
2167 ceph_encode_timespec64(&req->r_args.setattr.mtime,
2168 &attr->ia_mtime);
2169 mask |= CEPH_SETATTR_MTIME;
2170 release |= CEPH_CAP_FILE_SHARED |
2171 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2172 }
2173 }
2174
2175 /* these do nothing */
2176 if (ia_valid & ATTR_CTIME) {
2177 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
2178 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
2179 dout("setattr %p ctime %lld.%ld -> %lld.%ld (%s)\n", inode,
2180 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
2181 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
2182 only ? "ctime only" : "ignored");
2183 if (only) {
2184 /*
2185 * if kernel wants to dirty ctime but nothing else,
2186 * we need to choose a cap to dirty under, or do
2187 * a almost-no-op setattr
2188 */
2189 if (issued & CEPH_CAP_AUTH_EXCL)
2190 dirtied |= CEPH_CAP_AUTH_EXCL;
2191 else if (issued & CEPH_CAP_FILE_EXCL)
2192 dirtied |= CEPH_CAP_FILE_EXCL;
2193 else if (issued & CEPH_CAP_XATTR_EXCL)
2194 dirtied |= CEPH_CAP_XATTR_EXCL;
2195 else
2196 mask |= CEPH_SETATTR_CTIME;
2197 }
2198 }
2199 if (ia_valid & ATTR_FILE)
2200 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
2201
2202 if (dirtied) {
2203 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
2204 &prealloc_cf);
2205 inode->i_ctime = attr->ia_ctime;
2206 }
2207
2208 release &= issued;
2209 spin_unlock(&ci->i_ceph_lock);
2210 if (lock_snap_rwsem)
2211 up_read(&mdsc->snap_rwsem);
2212
2213 if (inode_dirty_flags)
2214 __mark_inode_dirty(inode, inode_dirty_flags);
2215
2216
2217 if (mask) {
2218 req->r_inode = inode;
2219 ihold(inode);
2220 req->r_inode_drop = release;
2221 req->r_args.setattr.mask = cpu_to_le32(mask);
2222 req->r_num_caps = 1;
2223 req->r_stamp = attr->ia_ctime;
2224 err = ceph_mdsc_do_request(mdsc, NULL, req);
2225 }
2226 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
2227 ceph_cap_string(dirtied), mask);
2228
2229 ceph_mdsc_put_request(req);
2230 ceph_free_cap_flush(prealloc_cf);
2231
2232 if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
2233 __ceph_do_pending_vmtruncate(inode);
2234
2235 return err;
2236 }
2237
2238 /*
2239 * setattr
2240 */
ceph_setattr(struct user_namespace * mnt_userns,struct dentry * dentry,struct iattr * attr)2241 int ceph_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
2242 struct iattr *attr)
2243 {
2244 struct inode *inode = d_inode(dentry);
2245 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
2246 int err;
2247
2248 if (ceph_snap(inode) != CEPH_NOSNAP)
2249 return -EROFS;
2250
2251 err = setattr_prepare(&init_user_ns, dentry, attr);
2252 if (err != 0)
2253 return err;
2254
2255 if ((attr->ia_valid & ATTR_SIZE) &&
2256 attr->ia_size > max(i_size_read(inode), fsc->max_file_size))
2257 return -EFBIG;
2258
2259 if ((attr->ia_valid & ATTR_SIZE) &&
2260 ceph_quota_is_max_bytes_exceeded(inode, attr->ia_size))
2261 return -EDQUOT;
2262
2263 err = __ceph_setattr(inode, attr);
2264
2265 if (err >= 0 && (attr->ia_valid & ATTR_MODE))
2266 err = posix_acl_chmod(&init_user_ns, inode, attr->ia_mode);
2267
2268 return err;
2269 }
2270
2271 /*
2272 * Verify that we have a lease on the given mask. If not,
2273 * do a getattr against an mds.
2274 */
__ceph_do_getattr(struct inode * inode,struct page * locked_page,int mask,bool force)2275 int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2276 int mask, bool force)
2277 {
2278 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2279 struct ceph_mds_client *mdsc = fsc->mdsc;
2280 struct ceph_mds_request *req;
2281 int mode;
2282 int err;
2283
2284 if (ceph_snap(inode) == CEPH_SNAPDIR) {
2285 dout("do_getattr inode %p SNAPDIR\n", inode);
2286 return 0;
2287 }
2288
2289 dout("do_getattr inode %p mask %s mode 0%o\n",
2290 inode, ceph_cap_string(mask), inode->i_mode);
2291 if (!force && ceph_caps_issued_mask_metric(ceph_inode(inode), mask, 1))
2292 return 0;
2293
2294 mode = (mask & CEPH_STAT_RSTAT) ? USE_AUTH_MDS : USE_ANY_MDS;
2295 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
2296 if (IS_ERR(req))
2297 return PTR_ERR(req);
2298 req->r_inode = inode;
2299 ihold(inode);
2300 req->r_num_caps = 1;
2301 req->r_args.getattr.mask = cpu_to_le32(mask);
2302 req->r_locked_page = locked_page;
2303 err = ceph_mdsc_do_request(mdsc, NULL, req);
2304 if (locked_page && err == 0) {
2305 u64 inline_version = req->r_reply_info.targeti.inline_version;
2306 if (inline_version == 0) {
2307 /* the reply is supposed to contain inline data */
2308 err = -EINVAL;
2309 } else if (inline_version == CEPH_INLINE_NONE) {
2310 err = -ENODATA;
2311 } else {
2312 err = req->r_reply_info.targeti.inline_len;
2313 }
2314 }
2315 ceph_mdsc_put_request(req);
2316 dout("do_getattr result=%d\n", err);
2317 return err;
2318 }
2319
2320
2321 /*
2322 * Check inode permissions. We verify we have a valid value for
2323 * the AUTH cap, then call the generic handler.
2324 */
ceph_permission(struct user_namespace * mnt_userns,struct inode * inode,int mask)2325 int ceph_permission(struct user_namespace *mnt_userns, struct inode *inode,
2326 int mask)
2327 {
2328 int err;
2329
2330 if (mask & MAY_NOT_BLOCK)
2331 return -ECHILD;
2332
2333 err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
2334
2335 if (!err)
2336 err = generic_permission(&init_user_ns, inode, mask);
2337 return err;
2338 }
2339
2340 /* Craft a mask of needed caps given a set of requested statx attrs. */
statx_to_caps(u32 want,umode_t mode)2341 static int statx_to_caps(u32 want, umode_t mode)
2342 {
2343 int mask = 0;
2344
2345 if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME|STATX_BTIME))
2346 mask |= CEPH_CAP_AUTH_SHARED;
2347
2348 if (want & (STATX_NLINK|STATX_CTIME)) {
2349 /*
2350 * The link count for directories depends on inode->i_subdirs,
2351 * and that is only updated when Fs caps are held.
2352 */
2353 if (S_ISDIR(mode))
2354 mask |= CEPH_CAP_FILE_SHARED;
2355 else
2356 mask |= CEPH_CAP_LINK_SHARED;
2357 }
2358
2359 if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE|
2360 STATX_BLOCKS))
2361 mask |= CEPH_CAP_FILE_SHARED;
2362
2363 if (want & (STATX_CTIME))
2364 mask |= CEPH_CAP_XATTR_SHARED;
2365
2366 return mask;
2367 }
2368
2369 /*
2370 * Get all the attributes. If we have sufficient caps for the requested attrs,
2371 * then we can avoid talking to the MDS at all.
2372 */
ceph_getattr(struct user_namespace * mnt_userns,const struct path * path,struct kstat * stat,u32 request_mask,unsigned int flags)2373 int ceph_getattr(struct user_namespace *mnt_userns, const struct path *path,
2374 struct kstat *stat, u32 request_mask, unsigned int flags)
2375 {
2376 struct inode *inode = d_inode(path->dentry);
2377 struct ceph_inode_info *ci = ceph_inode(inode);
2378 u32 valid_mask = STATX_BASIC_STATS;
2379 int err = 0;
2380
2381 /* Skip the getattr altogether if we're asked not to sync */
2382 if (!(flags & AT_STATX_DONT_SYNC)) {
2383 err = ceph_do_getattr(inode,
2384 statx_to_caps(request_mask, inode->i_mode),
2385 flags & AT_STATX_FORCE_SYNC);
2386 if (err)
2387 return err;
2388 }
2389
2390 generic_fillattr(&init_user_ns, inode, stat);
2391 stat->ino = ceph_present_inode(inode);
2392
2393 /*
2394 * btime on newly-allocated inodes is 0, so if this is still set to
2395 * that, then assume that it's not valid.
2396 */
2397 if (ci->i_btime.tv_sec || ci->i_btime.tv_nsec) {
2398 stat->btime = ci->i_btime;
2399 valid_mask |= STATX_BTIME;
2400 }
2401
2402 if (ceph_snap(inode) == CEPH_NOSNAP)
2403 stat->dev = inode->i_sb->s_dev;
2404 else
2405 stat->dev = ci->i_snapid_map ? ci->i_snapid_map->dev : 0;
2406
2407 if (S_ISDIR(inode->i_mode)) {
2408 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
2409 RBYTES))
2410 stat->size = ci->i_rbytes;
2411 else
2412 stat->size = ci->i_files + ci->i_subdirs;
2413 stat->blocks = 0;
2414 stat->blksize = 65536;
2415 /*
2416 * Some applications rely on the number of st_nlink
2417 * value on directories to be either 0 (if unlinked)
2418 * or 2 + number of subdirectories.
2419 */
2420 if (stat->nlink == 1)
2421 /* '.' + '..' + subdirs */
2422 stat->nlink = 1 + 1 + ci->i_subdirs;
2423 }
2424
2425 stat->result_mask = request_mask & valid_mask;
2426 return err;
2427 }
2428