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