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drm/panfrost: Remove set but not used variable 'bo'
[linux/fpc-iii.git] / fs / ceph / inode.c
blobd01710a16a4afa857bf5fac45e1a2ce02eb91525
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 */
42 static int ceph_set_ino_cb(struct inode *inode, void *data)
43 {
44 ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
45 inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
46 inode_set_iversion_raw(inode, 0);
47 return 0;
48 }
49
50 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
51 {
52 struct inode *inode;
53 ino_t t = ceph_vino_to_ino(vino);
54
55 inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
56 if (!inode)
57 return ERR_PTR(-ENOMEM);
58 if (inode->i_state & I_NEW)
59 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
60 inode, ceph_vinop(inode), (u64)inode->i_ino);
61
62 dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
63 vino.snap, inode);
64 return inode;
65 }
66
67 /*
68 * get/constuct snapdir inode for a given directory
69 */
70 struct inode *ceph_get_snapdir(struct inode *parent)
71 {
72 struct ceph_vino vino = {
73 .ino = ceph_ino(parent),
74 .snap = CEPH_SNAPDIR,
75 };
76 struct inode *inode = ceph_get_inode(parent->i_sb, vino);
77 struct ceph_inode_info *ci = ceph_inode(inode);
78
79 BUG_ON(!S_ISDIR(parent->i_mode));
80 if (IS_ERR(inode))
81 return inode;
82 inode->i_mode = parent->i_mode;
83 inode->i_uid = parent->i_uid;
84 inode->i_gid = parent->i_gid;
85 inode->i_op = &ceph_snapdir_iops;
86 inode->i_fop = &ceph_snapdir_fops;
87 ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
88 ci->i_rbytes = 0;
89
90 if (inode->i_state & I_NEW)
91 unlock_new_inode(inode);
92
93 return inode;
94 }
95
96 const struct inode_operations ceph_file_iops = {
97 .permission = ceph_permission,
98 .setattr = ceph_setattr,
99 .getattr = ceph_getattr,
100 .listxattr = ceph_listxattr,
101 .get_acl = ceph_get_acl,
102 .set_acl = ceph_set_acl,
103 };
104
105
106 /*
107 * We use a 'frag tree' to keep track of the MDS's directory fragments
108 * for a given inode (usually there is just a single fragment). We
109 * need to know when a child frag is delegated to a new MDS, or when
110 * it is flagged as replicated, so we can direct our requests
111 * accordingly.
112 */
113
114 /*
115 * find/create a frag in the tree
116 */
117 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
118 u32 f)
119 {
120 struct rb_node **p;
121 struct rb_node *parent = NULL;
122 struct ceph_inode_frag *frag;
123 int c;
124
125 p = &ci->i_fragtree.rb_node;
126 while (*p) {
127 parent = *p;
128 frag = rb_entry(parent, struct ceph_inode_frag, node);
129 c = ceph_frag_compare(f, frag->frag);
130 if (c < 0)
131 p = &(*p)->rb_left;
132 else if (c > 0)
133 p = &(*p)->rb_right;
134 else
135 return frag;
136 }
137
138 frag = kmalloc(sizeof(*frag), GFP_NOFS);
139 if (!frag)
140 return ERR_PTR(-ENOMEM);
141
142 frag->frag = f;
143 frag->split_by = 0;
144 frag->mds = -1;
145 frag->ndist = 0;
146
147 rb_link_node(&frag->node, parent, p);
148 rb_insert_color(&frag->node, &ci->i_fragtree);
149
150 dout("get_or_create_frag added %llx.%llx frag %x\n",
151 ceph_vinop(&ci->vfs_inode), f);
152 return frag;
153 }
154
155 /*
156 * find a specific frag @f
157 */
158 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
159 {
160 struct rb_node *n = ci->i_fragtree.rb_node;
161
162 while (n) {
163 struct ceph_inode_frag *frag =
164 rb_entry(n, struct ceph_inode_frag, node);
165 int c = ceph_frag_compare(f, frag->frag);
166 if (c < 0)
167 n = n->rb_left;
168 else if (c > 0)
169 n = n->rb_right;
170 else
171 return frag;
172 }
173 return NULL;
174 }
175
176 /*
177 * Choose frag containing the given value @v. If @pfrag is
178 * specified, copy the frag delegation info to the caller if
179 * it is present.
180 */
181 static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
182 struct ceph_inode_frag *pfrag, int *found)
183 {
184 u32 t = ceph_frag_make(0, 0);
185 struct ceph_inode_frag *frag;
186 unsigned nway, i;
187 u32 n;
188
189 if (found)
190 *found = 0;
191
192 while (1) {
193 WARN_ON(!ceph_frag_contains_value(t, v));
194 frag = __ceph_find_frag(ci, t);
195 if (!frag)
196 break; /* t is a leaf */
197 if (frag->split_by == 0) {
198 if (pfrag)
199 memcpy(pfrag, frag, sizeof(*pfrag));
200 if (found)
201 *found = 1;
202 break;
203 }
204
205 /* choose child */
206 nway = 1 << frag->split_by;
207 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
208 frag->split_by, nway);
209 for (i = 0; i < nway; i++) {
210 n = ceph_frag_make_child(t, frag->split_by, i);
211 if (ceph_frag_contains_value(n, v)) {
212 t = n;
213 break;
214 }
215 }
216 BUG_ON(i == nway);
217 }
218 dout("choose_frag(%x) = %x\n", v, t);
219
220 return t;
221 }
222
223 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
224 struct ceph_inode_frag *pfrag, int *found)
225 {
226 u32 ret;
227 mutex_lock(&ci->i_fragtree_mutex);
228 ret = __ceph_choose_frag(ci, v, pfrag, found);
229 mutex_unlock(&ci->i_fragtree_mutex);
230 return ret;
231 }
232
233 /*
234 * Process dirfrag (delegation) info from the mds. Include leaf
235 * fragment in tree ONLY if ndist > 0. Otherwise, only
236 * branches/splits are included in i_fragtree)
237 */
238 static int ceph_fill_dirfrag(struct inode *inode,
239 struct ceph_mds_reply_dirfrag *dirinfo)
240 {
241 struct ceph_inode_info *ci = ceph_inode(inode);
242 struct ceph_inode_frag *frag;
243 u32 id = le32_to_cpu(dirinfo->frag);
244 int mds = le32_to_cpu(dirinfo->auth);
245 int ndist = le32_to_cpu(dirinfo->ndist);
246 int diri_auth = -1;
247 int i;
248 int err = 0;
249
250 spin_lock(&ci->i_ceph_lock);
251 if (ci->i_auth_cap)
252 diri_auth = ci->i_auth_cap->mds;
253 spin_unlock(&ci->i_ceph_lock);
254
255 if (mds == -1) /* CDIR_AUTH_PARENT */
256 mds = diri_auth;
257
258 mutex_lock(&ci->i_fragtree_mutex);
259 if (ndist == 0 && mds == diri_auth) {
260 /* no delegation info needed. */
261 frag = __ceph_find_frag(ci, id);
262 if (!frag)
263 goto out;
264 if (frag->split_by == 0) {
265 /* tree leaf, remove */
266 dout("fill_dirfrag removed %llx.%llx frag %x"
267 " (no ref)\n", ceph_vinop(inode), id);
268 rb_erase(&frag->node, &ci->i_fragtree);
269 kfree(frag);
270 } else {
271 /* tree branch, keep and clear */
272 dout("fill_dirfrag cleared %llx.%llx frag %x"
273 " referral\n", ceph_vinop(inode), id);
274 frag->mds = -1;
275 frag->ndist = 0;
276 }
277 goto out;
278 }
279
280
281 /* find/add this frag to store mds delegation info */
282 frag = __get_or_create_frag(ci, id);
283 if (IS_ERR(frag)) {
284 /* this is not the end of the world; we can continue
285 with bad/inaccurate delegation info */
286 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
287 ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
288 err = -ENOMEM;
289 goto out;
290 }
291
292 frag->mds = mds;
293 frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
294 for (i = 0; i < frag->ndist; i++)
295 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
296 dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
297 ceph_vinop(inode), frag->frag, frag->ndist);
298
299 out:
300 mutex_unlock(&ci->i_fragtree_mutex);
301 return err;
302 }
303
304 static int frag_tree_split_cmp(const void *l, const void *r)
305 {
306 struct ceph_frag_tree_split *ls = (struct ceph_frag_tree_split*)l;
307 struct ceph_frag_tree_split *rs = (struct ceph_frag_tree_split*)r;
308 return ceph_frag_compare(le32_to_cpu(ls->frag),
309 le32_to_cpu(rs->frag));
310 }
311
312 static bool is_frag_child(u32 f, struct ceph_inode_frag *frag)
313 {
314 if (!frag)
315 return f == ceph_frag_make(0, 0);
316 if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by)
317 return false;
318 return ceph_frag_contains_value(frag->frag, ceph_frag_value(f));
319 }
320
321 static int ceph_fill_fragtree(struct inode *inode,
322 struct ceph_frag_tree_head *fragtree,
323 struct ceph_mds_reply_dirfrag *dirinfo)
324 {
325 struct ceph_inode_info *ci = ceph_inode(inode);
326 struct ceph_inode_frag *frag, *prev_frag = NULL;
327 struct rb_node *rb_node;
328 unsigned i, split_by, nsplits;
329 u32 id;
330 bool update = false;
331
332 mutex_lock(&ci->i_fragtree_mutex);
333 nsplits = le32_to_cpu(fragtree->nsplits);
334 if (nsplits != ci->i_fragtree_nsplits) {
335 update = true;
336 } else if (nsplits) {
337 i = prandom_u32() % nsplits;
338 id = le32_to_cpu(fragtree->splits[i].frag);
339 if (!__ceph_find_frag(ci, id))
340 update = true;
341 } else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) {
342 rb_node = rb_first(&ci->i_fragtree);
343 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
344 if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node))
345 update = true;
346 }
347 if (!update && dirinfo) {
348 id = le32_to_cpu(dirinfo->frag);
349 if (id != __ceph_choose_frag(ci, id, NULL, NULL))
350 update = true;
351 }
352 if (!update)
353 goto out_unlock;
354
355 if (nsplits > 1) {
356 sort(fragtree->splits, nsplits, sizeof(fragtree->splits[0]),
357 frag_tree_split_cmp, NULL);
358 }
359
360 dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode));
361 rb_node = rb_first(&ci->i_fragtree);
362 for (i = 0; i < nsplits; i++) {
363 id = le32_to_cpu(fragtree->splits[i].frag);
364 split_by = le32_to_cpu(fragtree->splits[i].by);
365 if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) {
366 pr_err("fill_fragtree %llx.%llx invalid split %d/%u, "
367 "frag %x split by %d\n", ceph_vinop(inode),
368 i, nsplits, id, split_by);
369 continue;
370 }
371 frag = NULL;
372 while (rb_node) {
373 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
374 if (ceph_frag_compare(frag->frag, id) >= 0) {
375 if (frag->frag != id)
376 frag = NULL;
377 else
378 rb_node = rb_next(rb_node);
379 break;
380 }
381 rb_node = rb_next(rb_node);
382 /* delete stale split/leaf node */
383 if (frag->split_by > 0 ||
384 !is_frag_child(frag->frag, prev_frag)) {
385 rb_erase(&frag->node, &ci->i_fragtree);
386 if (frag->split_by > 0)
387 ci->i_fragtree_nsplits--;
388 kfree(frag);
389 }
390 frag = NULL;
391 }
392 if (!frag) {
393 frag = __get_or_create_frag(ci, id);
394 if (IS_ERR(frag))
395 continue;
396 }
397 if (frag->split_by == 0)
398 ci->i_fragtree_nsplits++;
399 frag->split_by = split_by;
400 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
401 prev_frag = frag;
402 }
403 while (rb_node) {
404 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
405 rb_node = rb_next(rb_node);
406 /* delete stale split/leaf node */
407 if (frag->split_by > 0 ||
408 !is_frag_child(frag->frag, prev_frag)) {
409 rb_erase(&frag->node, &ci->i_fragtree);
410 if (frag->split_by > 0)
411 ci->i_fragtree_nsplits--;
412 kfree(frag);
413 }
414 }
415 out_unlock:
416 mutex_unlock(&ci->i_fragtree_mutex);
417 return 0;
418 }
419
420 /*
421 * initialize a newly allocated inode.
422 */
423 struct inode *ceph_alloc_inode(struct super_block *sb)
424 {
425 struct ceph_inode_info *ci;
426 int i;
427
428 ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
429 if (!ci)
430 return NULL;
431
432 dout("alloc_inode %p\n", &ci->vfs_inode);
433
434 spin_lock_init(&ci->i_ceph_lock);
435
436 ci->i_version = 0;
437 ci->i_inline_version = 0;
438 ci->i_time_warp_seq = 0;
439 ci->i_ceph_flags = 0;
440 atomic64_set(&ci->i_ordered_count, 1);
441 atomic64_set(&ci->i_release_count, 1);
442 atomic64_set(&ci->i_complete_seq[0], 0);
443 atomic64_set(&ci->i_complete_seq[1], 0);
444 ci->i_symlink = NULL;
445
446 ci->i_max_bytes = 0;
447 ci->i_max_files = 0;
448
449 memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
450 RCU_INIT_POINTER(ci->i_layout.pool_ns, NULL);
451
452 ci->i_fragtree = RB_ROOT;
453 mutex_init(&ci->i_fragtree_mutex);
454
455 ci->i_xattrs.blob = NULL;
456 ci->i_xattrs.prealloc_blob = NULL;
457 ci->i_xattrs.dirty = false;
458 ci->i_xattrs.index = RB_ROOT;
459 ci->i_xattrs.count = 0;
460 ci->i_xattrs.names_size = 0;
461 ci->i_xattrs.vals_size = 0;
462 ci->i_xattrs.version = 0;
463 ci->i_xattrs.index_version = 0;
464
465 ci->i_caps = RB_ROOT;
466 ci->i_auth_cap = NULL;
467 ci->i_dirty_caps = 0;
468 ci->i_flushing_caps = 0;
469 INIT_LIST_HEAD(&ci->i_dirty_item);
470 INIT_LIST_HEAD(&ci->i_flushing_item);
471 ci->i_prealloc_cap_flush = NULL;
472 INIT_LIST_HEAD(&ci->i_cap_flush_list);
473 init_waitqueue_head(&ci->i_cap_wq);
474 ci->i_hold_caps_min = 0;
475 ci->i_hold_caps_max = 0;
476 INIT_LIST_HEAD(&ci->i_cap_delay_list);
477 INIT_LIST_HEAD(&ci->i_cap_snaps);
478 ci->i_head_snapc = NULL;
479 ci->i_snap_caps = 0;
480
481 for (i = 0; i < CEPH_FILE_MODE_BITS; i++)
482 ci->i_nr_by_mode[i] = 0;
483
484 mutex_init(&ci->i_truncate_mutex);
485 ci->i_truncate_seq = 0;
486 ci->i_truncate_size = 0;
487 ci->i_truncate_pending = 0;
488
489 ci->i_max_size = 0;
490 ci->i_reported_size = 0;
491 ci->i_wanted_max_size = 0;
492 ci->i_requested_max_size = 0;
493
494 ci->i_pin_ref = 0;
495 ci->i_rd_ref = 0;
496 ci->i_rdcache_ref = 0;
497 ci->i_wr_ref = 0;
498 ci->i_wb_ref = 0;
499 ci->i_wrbuffer_ref = 0;
500 ci->i_wrbuffer_ref_head = 0;
501 atomic_set(&ci->i_filelock_ref, 0);
502 atomic_set(&ci->i_shared_gen, 1);
503 ci->i_rdcache_gen = 0;
504 ci->i_rdcache_revoking = 0;
505
506 INIT_LIST_HEAD(&ci->i_unsafe_dirops);
507 INIT_LIST_HEAD(&ci->i_unsafe_iops);
508 spin_lock_init(&ci->i_unsafe_lock);
509
510 ci->i_snap_realm = NULL;
511 INIT_LIST_HEAD(&ci->i_snap_realm_item);
512 INIT_LIST_HEAD(&ci->i_snap_flush_item);
513
514 INIT_WORK(&ci->i_work, ceph_inode_work);
515 ci->i_work_mask = 0;
516 memset(&ci->i_btime, '\0', sizeof(ci->i_btime));
517
518 ceph_fscache_inode_init(ci);
519
520 ci->i_meta_err = 0;
521
522 return &ci->vfs_inode;
523 }
524
525 void ceph_free_inode(struct inode *inode)
526 {
527 struct ceph_inode_info *ci = ceph_inode(inode);
528
529 kfree(ci->i_symlink);
530 kmem_cache_free(ceph_inode_cachep, ci);
531 }
532
533 void ceph_evict_inode(struct inode *inode)
534 {
535 struct ceph_inode_info *ci = ceph_inode(inode);
536 struct ceph_inode_frag *frag;
537 struct rb_node *n;
538
539 dout("evict_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
540
541 truncate_inode_pages_final(&inode->i_data);
542 clear_inode(inode);
543
544 ceph_fscache_unregister_inode_cookie(ci);
545
546 __ceph_remove_caps(ci);
547
548 if (__ceph_has_any_quota(ci))
549 ceph_adjust_quota_realms_count(inode, false);
550
551 /*
552 * we may still have a snap_realm reference if there are stray
553 * caps in i_snap_caps.
554 */
555 if (ci->i_snap_realm) {
556 struct ceph_mds_client *mdsc =
557 ceph_inode_to_client(inode)->mdsc;
558 if (ceph_snap(inode) == CEPH_NOSNAP) {
559 struct ceph_snap_realm *realm = ci->i_snap_realm;
560 dout(" dropping residual ref to snap realm %p\n",
561 realm);
562 spin_lock(&realm->inodes_with_caps_lock);
563 list_del_init(&ci->i_snap_realm_item);
564 ci->i_snap_realm = NULL;
565 if (realm->ino == ci->i_vino.ino)
566 realm->inode = NULL;
567 spin_unlock(&realm->inodes_with_caps_lock);
568 ceph_put_snap_realm(mdsc, realm);
569 } else {
570 ceph_put_snapid_map(mdsc, ci->i_snapid_map);
571 ci->i_snap_realm = NULL;
572 }
573 }
574
575 while ((n = rb_first(&ci->i_fragtree)) != NULL) {
576 frag = rb_entry(n, struct ceph_inode_frag, node);
577 rb_erase(n, &ci->i_fragtree);
578 kfree(frag);
579 }
580 ci->i_fragtree_nsplits = 0;
581
582 __ceph_destroy_xattrs(ci);
583 if (ci->i_xattrs.blob)
584 ceph_buffer_put(ci->i_xattrs.blob);
585 if (ci->i_xattrs.prealloc_blob)
586 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
587
588 ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns));
589 }
590
591 static inline blkcnt_t calc_inode_blocks(u64 size)
592 {
593 return (size + (1<<9) - 1) >> 9;
594 }
595
596 /*
597 * Helpers to fill in size, ctime, mtime, and atime. We have to be
598 * careful because either the client or MDS may have more up to date
599 * info, depending on which capabilities are held, and whether
600 * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime
601 * and size are monotonically increasing, except when utimes() or
602 * truncate() increments the corresponding _seq values.)
603 */
604 int ceph_fill_file_size(struct inode *inode, int issued,
605 u32 truncate_seq, u64 truncate_size, u64 size)
606 {
607 struct ceph_inode_info *ci = ceph_inode(inode);
608 int queue_trunc = 0;
609
610 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
611 (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
612 dout("size %lld -> %llu\n", inode->i_size, size);
613 if (size > 0 && S_ISDIR(inode->i_mode)) {
614 pr_err("fill_file_size non-zero size for directory\n");
615 size = 0;
616 }
617 i_size_write(inode, size);
618 inode->i_blocks = calc_inode_blocks(size);
619 ci->i_reported_size = size;
620 if (truncate_seq != ci->i_truncate_seq) {
621 dout("truncate_seq %u -> %u\n",
622 ci->i_truncate_seq, truncate_seq);
623 ci->i_truncate_seq = truncate_seq;
624
625 /* the MDS should have revoked these caps */
626 WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
627 CEPH_CAP_FILE_RD |
628 CEPH_CAP_FILE_WR |
629 CEPH_CAP_FILE_LAZYIO));
630 /*
631 * If we hold relevant caps, or in the case where we're
632 * not the only client referencing this file and we
633 * don't hold those caps, then we need to check whether
634 * the file is either opened or mmaped
635 */
636 if ((issued & (CEPH_CAP_FILE_CACHE|
637 CEPH_CAP_FILE_BUFFER)) ||
638 mapping_mapped(inode->i_mapping) ||
639 __ceph_caps_file_wanted(ci)) {
640 ci->i_truncate_pending++;
641 queue_trunc = 1;
642 }
643 }
644 }
645 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
646 ci->i_truncate_size != truncate_size) {
647 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
648 truncate_size);
649 ci->i_truncate_size = truncate_size;
650 }
651
652 if (queue_trunc)
653 ceph_fscache_invalidate(inode);
654
655 return queue_trunc;
656 }
657
658 void ceph_fill_file_time(struct inode *inode, int issued,
659 u64 time_warp_seq, struct timespec64 *ctime,
660 struct timespec64 *mtime, struct timespec64 *atime)
661 {
662 struct ceph_inode_info *ci = ceph_inode(inode);
663 int warn = 0;
664
665 if (issued & (CEPH_CAP_FILE_EXCL|
666 CEPH_CAP_FILE_WR|
667 CEPH_CAP_FILE_BUFFER|
668 CEPH_CAP_AUTH_EXCL|
669 CEPH_CAP_XATTR_EXCL)) {
670 if (ci->i_version == 0 ||
671 timespec64_compare(ctime, &inode->i_ctime) > 0) {
672 dout("ctime %lld.%09ld -> %lld.%09ld inc w/ cap\n",
673 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
674 ctime->tv_sec, ctime->tv_nsec);
675 inode->i_ctime = *ctime;
676 }
677 if (ci->i_version == 0 ||
678 ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
679 /* the MDS did a utimes() */
680 dout("mtime %lld.%09ld -> %lld.%09ld "
681 "tw %d -> %d\n",
682 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
683 mtime->tv_sec, mtime->tv_nsec,
684 ci->i_time_warp_seq, (int)time_warp_seq);
685
686 inode->i_mtime = *mtime;
687 inode->i_atime = *atime;
688 ci->i_time_warp_seq = time_warp_seq;
689 } else if (time_warp_seq == ci->i_time_warp_seq) {
690 /* nobody did utimes(); take the max */
691 if (timespec64_compare(mtime, &inode->i_mtime) > 0) {
692 dout("mtime %lld.%09ld -> %lld.%09ld inc\n",
693 inode->i_mtime.tv_sec,
694 inode->i_mtime.tv_nsec,
695 mtime->tv_sec, mtime->tv_nsec);
696 inode->i_mtime = *mtime;
697 }
698 if (timespec64_compare(atime, &inode->i_atime) > 0) {
699 dout("atime %lld.%09ld -> %lld.%09ld inc\n",
700 inode->i_atime.tv_sec,
701 inode->i_atime.tv_nsec,
702 atime->tv_sec, atime->tv_nsec);
703 inode->i_atime = *atime;
704 }
705 } else if (issued & CEPH_CAP_FILE_EXCL) {
706 /* we did a utimes(); ignore mds values */
707 } else {
708 warn = 1;
709 }
710 } else {
711 /* we have no write|excl caps; whatever the MDS says is true */
712 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
713 inode->i_ctime = *ctime;
714 inode->i_mtime = *mtime;
715 inode->i_atime = *atime;
716 ci->i_time_warp_seq = time_warp_seq;
717 } else {
718 warn = 1;
719 }
720 }
721 if (warn) /* time_warp_seq shouldn't go backwards */
722 dout("%p mds time_warp_seq %llu < %u\n",
723 inode, time_warp_seq, ci->i_time_warp_seq);
724 }
725
726 /*
727 * Populate an inode based on info from mds. May be called on new or
728 * existing inodes.
729 */
730 static int fill_inode(struct inode *inode, struct page *locked_page,
731 struct ceph_mds_reply_info_in *iinfo,
732 struct ceph_mds_reply_dirfrag *dirinfo,
733 struct ceph_mds_session *session, int cap_fmode,
734 struct ceph_cap_reservation *caps_reservation)
735 {
736 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
737 struct ceph_mds_reply_inode *info = iinfo->in;
738 struct ceph_inode_info *ci = ceph_inode(inode);
739 int issued, new_issued, info_caps;
740 struct timespec64 mtime, atime, ctime;
741 struct ceph_buffer *xattr_blob = NULL;
742 struct ceph_buffer *old_blob = NULL;
743 struct ceph_string *pool_ns = NULL;
744 struct ceph_cap *new_cap = NULL;
745 int err = 0;
746 bool wake = false;
747 bool queue_trunc = false;
748 bool new_version = false;
749 bool fill_inline = false;
750
751 dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
752 inode, ceph_vinop(inode), le64_to_cpu(info->version),
753 ci->i_version);
754
755 info_caps = le32_to_cpu(info->cap.caps);
756
757 /* prealloc new cap struct */
758 if (info_caps && ceph_snap(inode) == CEPH_NOSNAP) {
759 new_cap = ceph_get_cap(mdsc, caps_reservation);
760 if (!new_cap)
761 return -ENOMEM;
762 }
763
764 /*
765 * prealloc xattr data, if it looks like we'll need it. only
766 * if len > 4 (meaning there are actually xattrs; the first 4
767 * bytes are the xattr count).
768 */
769 if (iinfo->xattr_len > 4) {
770 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
771 if (!xattr_blob)
772 pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
773 iinfo->xattr_len);
774 }
775
776 if (iinfo->pool_ns_len > 0)
777 pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data,
778 iinfo->pool_ns_len);
779
780 if (ceph_snap(inode) != CEPH_NOSNAP && !ci->i_snapid_map)
781 ci->i_snapid_map = ceph_get_snapid_map(mdsc, ceph_snap(inode));
782
783 spin_lock(&ci->i_ceph_lock);
784
785 /*
786 * provided version will be odd if inode value is projected,
787 * even if stable. skip the update if we have newer stable
788 * info (ours>=theirs, e.g. due to racing mds replies), unless
789 * we are getting projected (unstable) info (in which case the
790 * version is odd, and we want ours>theirs).
791 * us them
792 * 2 2 skip
793 * 3 2 skip
794 * 3 3 update
795 */
796 if (ci->i_version == 0 ||
797 ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
798 le64_to_cpu(info->version) > (ci->i_version & ~1)))
799 new_version = true;
800
801 /* Update change_attribute */
802 inode_set_max_iversion_raw(inode, iinfo->change_attr);
803
804 __ceph_caps_issued(ci, &issued);
805 issued |= __ceph_caps_dirty(ci);
806 new_issued = ~issued & info_caps;
807
808 /* update inode */
809 inode->i_rdev = le32_to_cpu(info->rdev);
810 /* directories have fl_stripe_unit set to zero */
811 if (le32_to_cpu(info->layout.fl_stripe_unit))
812 inode->i_blkbits =
813 fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
814 else
815 inode->i_blkbits = CEPH_BLOCK_SHIFT;
816
817 __ceph_update_quota(ci, iinfo->max_bytes, iinfo->max_files);
818
819 if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
820 (issued & CEPH_CAP_AUTH_EXCL) == 0) {
821 inode->i_mode = le32_to_cpu(info->mode);
822 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
823 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
824 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
825 from_kuid(&init_user_ns, inode->i_uid),
826 from_kgid(&init_user_ns, inode->i_gid));
827 ceph_decode_timespec64(&ci->i_btime, &iinfo->btime);
828 ceph_decode_timespec64(&ci->i_snap_btime, &iinfo->snap_btime);
829 }
830
831 if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
832 (issued & CEPH_CAP_LINK_EXCL) == 0)
833 set_nlink(inode, le32_to_cpu(info->nlink));
834
835 if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
836 /* be careful with mtime, atime, size */
837 ceph_decode_timespec64(&atime, &info->atime);
838 ceph_decode_timespec64(&mtime, &info->mtime);
839 ceph_decode_timespec64(&ctime, &info->ctime);
840 ceph_fill_file_time(inode, issued,
841 le32_to_cpu(info->time_warp_seq),
842 &ctime, &mtime, &atime);
843 }
844
845 if (new_version || (info_caps & CEPH_CAP_FILE_SHARED)) {
846 ci->i_files = le64_to_cpu(info->files);
847 ci->i_subdirs = le64_to_cpu(info->subdirs);
848 }
849
850 if (new_version ||
851 (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
852 s64 old_pool = ci->i_layout.pool_id;
853 struct ceph_string *old_ns;
854
855 ceph_file_layout_from_legacy(&ci->i_layout, &info->layout);
856 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
857 lockdep_is_held(&ci->i_ceph_lock));
858 rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns);
859
860 if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns)
861 ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
862
863 pool_ns = old_ns;
864
865 queue_trunc = ceph_fill_file_size(inode, issued,
866 le32_to_cpu(info->truncate_seq),
867 le64_to_cpu(info->truncate_size),
868 le64_to_cpu(info->size));
869 /* only update max_size on auth cap */
870 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
871 ci->i_max_size != le64_to_cpu(info->max_size)) {
872 dout("max_size %lld -> %llu\n", ci->i_max_size,
873 le64_to_cpu(info->max_size));
874 ci->i_max_size = le64_to_cpu(info->max_size);
875 }
876 }
877
878 /* layout and rstat are not tracked by capability, update them if
879 * the inode info is from auth mds */
880 if (new_version || (info->cap.flags & CEPH_CAP_FLAG_AUTH)) {
881 if (S_ISDIR(inode->i_mode)) {
882 ci->i_dir_layout = iinfo->dir_layout;
883 ci->i_rbytes = le64_to_cpu(info->rbytes);
884 ci->i_rfiles = le64_to_cpu(info->rfiles);
885 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
886 ci->i_dir_pin = iinfo->dir_pin;
887 ceph_decode_timespec64(&ci->i_rctime, &info->rctime);
888 }
889 }
890
891 /* xattrs */
892 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
893 if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL)) &&
894 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
895 if (ci->i_xattrs.blob)
896 old_blob = ci->i_xattrs.blob;
897 ci->i_xattrs.blob = xattr_blob;
898 if (xattr_blob)
899 memcpy(ci->i_xattrs.blob->vec.iov_base,
900 iinfo->xattr_data, iinfo->xattr_len);
901 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
902 ceph_forget_all_cached_acls(inode);
903 ceph_security_invalidate_secctx(inode);
904 xattr_blob = NULL;
905 }
906
907 /* finally update i_version */
908 if (le64_to_cpu(info->version) > ci->i_version)
909 ci->i_version = le64_to_cpu(info->version);
910
911 inode->i_mapping->a_ops = &ceph_aops;
912
913 switch (inode->i_mode & S_IFMT) {
914 case S_IFIFO:
915 case S_IFBLK:
916 case S_IFCHR:
917 case S_IFSOCK:
918 inode->i_blkbits = PAGE_SHIFT;
919 init_special_inode(inode, inode->i_mode, inode->i_rdev);
920 inode->i_op = &ceph_file_iops;
921 break;
922 case S_IFREG:
923 inode->i_op = &ceph_file_iops;
924 inode->i_fop = &ceph_file_fops;
925 break;
926 case S_IFLNK:
927 inode->i_op = &ceph_symlink_iops;
928 if (!ci->i_symlink) {
929 u32 symlen = iinfo->symlink_len;
930 char *sym;
931
932 spin_unlock(&ci->i_ceph_lock);
933
934 if (symlen != i_size_read(inode)) {
935 pr_err("fill_inode %llx.%llx BAD symlink "
936 "size %lld\n", ceph_vinop(inode),
937 i_size_read(inode));
938 i_size_write(inode, symlen);
939 inode->i_blocks = calc_inode_blocks(symlen);
940 }
941
942 err = -ENOMEM;
943 sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
944 if (!sym)
945 goto out;
946
947 spin_lock(&ci->i_ceph_lock);
948 if (!ci->i_symlink)
949 ci->i_symlink = sym;
950 else
951 kfree(sym); /* lost a race */
952 }
953 inode->i_link = ci->i_symlink;
954 break;
955 case S_IFDIR:
956 inode->i_op = &ceph_dir_iops;
957 inode->i_fop = &ceph_dir_fops;
958 break;
959 default:
960 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
961 ceph_vinop(inode), inode->i_mode);
962 }
963
964 /* were we issued a capability? */
965 if (info_caps) {
966 if (ceph_snap(inode) == CEPH_NOSNAP) {
967 ceph_add_cap(inode, session,
968 le64_to_cpu(info->cap.cap_id),
969 cap_fmode, info_caps,
970 le32_to_cpu(info->cap.wanted),
971 le32_to_cpu(info->cap.seq),
972 le32_to_cpu(info->cap.mseq),
973 le64_to_cpu(info->cap.realm),
974 info->cap.flags, &new_cap);
975
976 /* set dir completion flag? */
977 if (S_ISDIR(inode->i_mode) &&
978 ci->i_files == 0 && ci->i_subdirs == 0 &&
979 (info_caps & CEPH_CAP_FILE_SHARED) &&
980 (issued & CEPH_CAP_FILE_EXCL) == 0 &&
981 !__ceph_dir_is_complete(ci)) {
982 dout(" marking %p complete (empty)\n", inode);
983 i_size_write(inode, 0);
984 __ceph_dir_set_complete(ci,
985 atomic64_read(&ci->i_release_count),
986 atomic64_read(&ci->i_ordered_count));
987 }
988
989 wake = true;
990 } else {
991 dout(" %p got snap_caps %s\n", inode,
992 ceph_cap_string(info_caps));
993 ci->i_snap_caps |= info_caps;
994 if (cap_fmode >= 0)
995 __ceph_get_fmode(ci, cap_fmode);
996 }
997 } else if (cap_fmode >= 0) {
998 pr_warn("mds issued no caps on %llx.%llx\n",
999 ceph_vinop(inode));
1000 __ceph_get_fmode(ci, cap_fmode);
1001 }
1002
1003 if (iinfo->inline_version > 0 &&
1004 iinfo->inline_version >= ci->i_inline_version) {
1005 int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1006 ci->i_inline_version = iinfo->inline_version;
1007 if (ci->i_inline_version != CEPH_INLINE_NONE &&
1008 (locked_page || (info_caps & cache_caps)))
1009 fill_inline = true;
1010 }
1011
1012 spin_unlock(&ci->i_ceph_lock);
1013
1014 if (fill_inline)
1015 ceph_fill_inline_data(inode, locked_page,
1016 iinfo->inline_data, iinfo->inline_len);
1017
1018 if (wake)
1019 wake_up_all(&ci->i_cap_wq);
1020
1021 /* queue truncate if we saw i_size decrease */
1022 if (queue_trunc)
1023 ceph_queue_vmtruncate(inode);
1024
1025 /* populate frag tree */
1026 if (S_ISDIR(inode->i_mode))
1027 ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
1028
1029 /* update delegation info? */
1030 if (dirinfo)
1031 ceph_fill_dirfrag(inode, dirinfo);
1032
1033 err = 0;
1034 out:
1035 if (new_cap)
1036 ceph_put_cap(mdsc, new_cap);
1037 ceph_buffer_put(old_blob);
1038 ceph_buffer_put(xattr_blob);
1039 ceph_put_string(pool_ns);
1040 return err;
1041 }
1042
1043 /*
1044 * caller should hold session s_mutex and dentry->d_lock.
1045 */
1046 static void __update_dentry_lease(struct inode *dir, struct dentry *dentry,
1047 struct ceph_mds_reply_lease *lease,
1048 struct ceph_mds_session *session,
1049 unsigned long from_time,
1050 struct ceph_mds_session **old_lease_session)
1051 {
1052 struct ceph_dentry_info *di = ceph_dentry(dentry);
1053 long unsigned duration = le32_to_cpu(lease->duration_ms);
1054 long unsigned ttl = from_time + (duration * HZ) / 1000;
1055 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
1056
1057 dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
1058 dentry, duration, ttl);
1059
1060 /* only track leases on regular dentries */
1061 if (ceph_snap(dir) != CEPH_NOSNAP)
1062 return;
1063
1064 di->lease_shared_gen = atomic_read(&ceph_inode(dir)->i_shared_gen);
1065 if (duration == 0) {
1066 __ceph_dentry_dir_lease_touch(di);
1067 return;
1068 }
1069
1070 if (di->lease_gen == session->s_cap_gen &&
1071 time_before(ttl, di->time))
1072 return; /* we already have a newer lease. */
1073
1074 if (di->lease_session && di->lease_session != session) {
1075 *old_lease_session = di->lease_session;
1076 di->lease_session = NULL;
1077 }
1078
1079 if (!di->lease_session)
1080 di->lease_session = ceph_get_mds_session(session);
1081 di->lease_gen = session->s_cap_gen;
1082 di->lease_seq = le32_to_cpu(lease->seq);
1083 di->lease_renew_after = half_ttl;
1084 di->lease_renew_from = 0;
1085 di->time = ttl;
1086
1087 __ceph_dentry_lease_touch(di);
1088 }
1089
1090 static inline void update_dentry_lease(struct inode *dir, struct dentry *dentry,
1091 struct ceph_mds_reply_lease *lease,
1092 struct ceph_mds_session *session,
1093 unsigned long from_time)
1094 {
1095 struct ceph_mds_session *old_lease_session = NULL;
1096 spin_lock(&dentry->d_lock);
1097 __update_dentry_lease(dir, dentry, lease, session, from_time,
1098 &old_lease_session);
1099 spin_unlock(&dentry->d_lock);
1100 if (old_lease_session)
1101 ceph_put_mds_session(old_lease_session);
1102 }
1103
1104 /*
1105 * update dentry lease without having parent inode locked
1106 */
1107 static void update_dentry_lease_careful(struct dentry *dentry,
1108 struct ceph_mds_reply_lease *lease,
1109 struct ceph_mds_session *session,
1110 unsigned long from_time,
1111 char *dname, u32 dname_len,
1112 struct ceph_vino *pdvino,
1113 struct ceph_vino *ptvino)
1114
1115 {
1116 struct inode *dir;
1117 struct ceph_mds_session *old_lease_session = NULL;
1118
1119 spin_lock(&dentry->d_lock);
1120 /* make sure dentry's name matches target */
1121 if (dentry->d_name.len != dname_len ||
1122 memcmp(dentry->d_name.name, dname, dname_len))
1123 goto out_unlock;
1124
1125 dir = d_inode(dentry->d_parent);
1126 /* make sure parent matches dvino */
1127 if (!ceph_ino_compare(dir, pdvino))
1128 goto out_unlock;
1129
1130 /* make sure dentry's inode matches target. NULL ptvino means that
1131 * we expect a negative dentry */
1132 if (ptvino) {
1133 if (d_really_is_negative(dentry))
1134 goto out_unlock;
1135 if (!ceph_ino_compare(d_inode(dentry), ptvino))
1136 goto out_unlock;
1137 } else {
1138 if (d_really_is_positive(dentry))
1139 goto out_unlock;
1140 }
1141
1142 __update_dentry_lease(dir, dentry, lease, session,
1143 from_time, &old_lease_session);
1144 out_unlock:
1145 spin_unlock(&dentry->d_lock);
1146 if (old_lease_session)
1147 ceph_put_mds_session(old_lease_session);
1148 }
1149
1150 /*
1151 * splice a dentry to an inode.
1152 * caller must hold directory i_mutex for this to be safe.
1153 */
1154 static int splice_dentry(struct dentry **pdn, struct inode *in)
1155 {
1156 struct dentry *dn = *pdn;
1157 struct dentry *realdn;
1158
1159 BUG_ON(d_inode(dn));
1160
1161 if (S_ISDIR(in->i_mode)) {
1162 /* If inode is directory, d_splice_alias() below will remove
1163 * 'realdn' from its origin parent. We need to ensure that
1164 * origin parent's readdir cache will not reference 'realdn'
1165 */
1166 realdn = d_find_any_alias(in);
1167 if (realdn) {
1168 struct ceph_dentry_info *di = ceph_dentry(realdn);
1169 spin_lock(&realdn->d_lock);
1170
1171 realdn->d_op->d_prune(realdn);
1172
1173 di->time = jiffies;
1174 di->lease_shared_gen = 0;
1175 di->offset = 0;
1176
1177 spin_unlock(&realdn->d_lock);
1178 dput(realdn);
1179 }
1180 }
1181
1182 /* dn must be unhashed */
1183 if (!d_unhashed(dn))
1184 d_drop(dn);
1185 realdn = d_splice_alias(in, dn);
1186 if (IS_ERR(realdn)) {
1187 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
1188 PTR_ERR(realdn), dn, in, ceph_vinop(in));
1189 return PTR_ERR(realdn);
1190 }
1191
1192 if (realdn) {
1193 dout("dn %p (%d) spliced with %p (%d) "
1194 "inode %p ino %llx.%llx\n",
1195 dn, d_count(dn),
1196 realdn, d_count(realdn),
1197 d_inode(realdn), ceph_vinop(d_inode(realdn)));
1198 dput(dn);
1199 *pdn = realdn;
1200 } else {
1201 BUG_ON(!ceph_dentry(dn));
1202 dout("dn %p attached to %p ino %llx.%llx\n",
1203 dn, d_inode(dn), ceph_vinop(d_inode(dn)));
1204 }
1205 return 0;
1206 }
1207
1208 /*
1209 * Incorporate results into the local cache. This is either just
1210 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1211 * after a lookup).
1212 *
1213 * A reply may contain
1214 * a directory inode along with a dentry.
1215 * and/or a target inode
1216 *
1217 * Called with snap_rwsem (read).
1218 */
1219 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
1220 {
1221 struct ceph_mds_session *session = req->r_session;
1222 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1223 struct inode *in = NULL;
1224 struct ceph_vino tvino, dvino;
1225 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1226 int err = 0;
1227
1228 dout("fill_trace %p is_dentry %d is_target %d\n", req,
1229 rinfo->head->is_dentry, rinfo->head->is_target);
1230
1231 if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1232 dout("fill_trace reply is empty!\n");
1233 if (rinfo->head->result == 0 && req->r_parent)
1234 ceph_invalidate_dir_request(req);
1235 return 0;
1236 }
1237
1238 if (rinfo->head->is_dentry) {
1239 struct inode *dir = req->r_parent;
1240
1241 if (dir) {
1242 err = fill_inode(dir, NULL,
1243 &rinfo->diri, rinfo->dirfrag,
1244 session, -1,
1245 &req->r_caps_reservation);
1246 if (err < 0)
1247 goto done;
1248 } else {
1249 WARN_ON_ONCE(1);
1250 }
1251
1252 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME &&
1253 test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1254 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1255 struct qstr dname;
1256 struct dentry *dn, *parent;
1257
1258 BUG_ON(!rinfo->head->is_target);
1259 BUG_ON(req->r_dentry);
1260
1261 parent = d_find_any_alias(dir);
1262 BUG_ON(!parent);
1263
1264 dname.name = rinfo->dname;
1265 dname.len = rinfo->dname_len;
1266 dname.hash = full_name_hash(parent, dname.name, dname.len);
1267 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1268 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1269 retry_lookup:
1270 dn = d_lookup(parent, &dname);
1271 dout("d_lookup on parent=%p name=%.*s got %p\n",
1272 parent, dname.len, dname.name, dn);
1273
1274 if (!dn) {
1275 dn = d_alloc(parent, &dname);
1276 dout("d_alloc %p '%.*s' = %p\n", parent,
1277 dname.len, dname.name, dn);
1278 if (!dn) {
1279 dput(parent);
1280 err = -ENOMEM;
1281 goto done;
1282 }
1283 err = 0;
1284 } else if (d_really_is_positive(dn) &&
1285 (ceph_ino(d_inode(dn)) != tvino.ino ||
1286 ceph_snap(d_inode(dn)) != tvino.snap)) {
1287 dout(" dn %p points to wrong inode %p\n",
1288 dn, d_inode(dn));
1289 ceph_dir_clear_ordered(dir);
1290 d_delete(dn);
1291 dput(dn);
1292 goto retry_lookup;
1293 }
1294
1295 req->r_dentry = dn;
1296 dput(parent);
1297 }
1298 }
1299
1300 if (rinfo->head->is_target) {
1301 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1302 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1303
1304 in = ceph_get_inode(sb, tvino);
1305 if (IS_ERR(in)) {
1306 err = PTR_ERR(in);
1307 goto done;
1308 }
1309
1310 err = fill_inode(in, req->r_locked_page, &rinfo->targeti, NULL,
1311 session,
1312 (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1313 rinfo->head->result == 0) ? req->r_fmode : -1,
1314 &req->r_caps_reservation);
1315 if (err < 0) {
1316 pr_err("fill_inode badness %p %llx.%llx\n",
1317 in, ceph_vinop(in));
1318 if (in->i_state & I_NEW)
1319 discard_new_inode(in);
1320 goto done;
1321 }
1322 req->r_target_inode = in;
1323 if (in->i_state & I_NEW)
1324 unlock_new_inode(in);
1325 }
1326
1327 /*
1328 * ignore null lease/binding on snapdir ENOENT, or else we
1329 * will have trouble splicing in the virtual snapdir later
1330 */
1331 if (rinfo->head->is_dentry &&
1332 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1333 test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1334 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1335 fsc->mount_options->snapdir_name,
1336 req->r_dentry->d_name.len))) {
1337 /*
1338 * lookup link rename : null -> possibly existing inode
1339 * mknod symlink mkdir : null -> new inode
1340 * unlink : linked -> null
1341 */
1342 struct inode *dir = req->r_parent;
1343 struct dentry *dn = req->r_dentry;
1344 bool have_dir_cap, have_lease;
1345
1346 BUG_ON(!dn);
1347 BUG_ON(!dir);
1348 BUG_ON(d_inode(dn->d_parent) != dir);
1349
1350 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1351 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1352
1353 BUG_ON(ceph_ino(dir) != dvino.ino);
1354 BUG_ON(ceph_snap(dir) != dvino.snap);
1355
1356 /* do we have a lease on the whole dir? */
1357 have_dir_cap =
1358 (le32_to_cpu(rinfo->diri.in->cap.caps) &
1359 CEPH_CAP_FILE_SHARED);
1360
1361 /* do we have a dn lease? */
1362 have_lease = have_dir_cap ||
1363 le32_to_cpu(rinfo->dlease->duration_ms);
1364 if (!have_lease)
1365 dout("fill_trace no dentry lease or dir cap\n");
1366
1367 /* rename? */
1368 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1369 struct inode *olddir = req->r_old_dentry_dir;
1370 BUG_ON(!olddir);
1371
1372 dout(" src %p '%pd' dst %p '%pd'\n",
1373 req->r_old_dentry,
1374 req->r_old_dentry,
1375 dn, dn);
1376 dout("fill_trace doing d_move %p -> %p\n",
1377 req->r_old_dentry, dn);
1378
1379 /* d_move screws up sibling dentries' offsets */
1380 ceph_dir_clear_ordered(dir);
1381 ceph_dir_clear_ordered(olddir);
1382
1383 d_move(req->r_old_dentry, dn);
1384 dout(" src %p '%pd' dst %p '%pd'\n",
1385 req->r_old_dentry,
1386 req->r_old_dentry,
1387 dn, dn);
1388
1389 /* ensure target dentry is invalidated, despite
1390 rehashing bug in vfs_rename_dir */
1391 ceph_invalidate_dentry_lease(dn);
1392
1393 dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1394 ceph_dentry(req->r_old_dentry)->offset);
1395
1396 /* swap r_dentry and r_old_dentry in case that
1397 * splice_dentry() gets called later. This is safe
1398 * because no other place will use them */
1399 req->r_dentry = req->r_old_dentry;
1400 req->r_old_dentry = dn;
1401 dn = req->r_dentry;
1402 }
1403
1404 /* null dentry? */
1405 if (!rinfo->head->is_target) {
1406 dout("fill_trace null dentry\n");
1407 if (d_really_is_positive(dn)) {
1408 dout("d_delete %p\n", dn);
1409 ceph_dir_clear_ordered(dir);
1410 d_delete(dn);
1411 } else if (have_lease) {
1412 if (d_unhashed(dn))
1413 d_add(dn, NULL);
1414 update_dentry_lease(dir, dn,
1415 rinfo->dlease, session,
1416 req->r_request_started);
1417 }
1418 goto done;
1419 }
1420
1421 /* attach proper inode */
1422 if (d_really_is_negative(dn)) {
1423 ceph_dir_clear_ordered(dir);
1424 ihold(in);
1425 err = splice_dentry(&req->r_dentry, in);
1426 if (err < 0)
1427 goto done;
1428 dn = req->r_dentry; /* may have spliced */
1429 } else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1430 dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1431 dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1432 ceph_vinop(in));
1433 d_invalidate(dn);
1434 have_lease = false;
1435 }
1436
1437 if (have_lease) {
1438 update_dentry_lease(dir, dn,
1439 rinfo->dlease, session,
1440 req->r_request_started);
1441 }
1442 dout(" final dn %p\n", dn);
1443 } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1444 req->r_op == CEPH_MDS_OP_MKSNAP) &&
1445 test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1446 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1447 struct inode *dir = req->r_parent;
1448
1449 /* fill out a snapdir LOOKUPSNAP dentry */
1450 BUG_ON(!dir);
1451 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1452 BUG_ON(!req->r_dentry);
1453 dout(" linking snapped dir %p to dn %p\n", in, req->r_dentry);
1454 ceph_dir_clear_ordered(dir);
1455 ihold(in);
1456 err = splice_dentry(&req->r_dentry, in);
1457 if (err < 0)
1458 goto done;
1459 } else if (rinfo->head->is_dentry && req->r_dentry) {
1460 /* parent inode is not locked, be carefull */
1461 struct ceph_vino *ptvino = NULL;
1462 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1463 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1464 if (rinfo->head->is_target) {
1465 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1466 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1467 ptvino = &tvino;
1468 }
1469 update_dentry_lease_careful(req->r_dentry, rinfo->dlease,
1470 session, req->r_request_started,
1471 rinfo->dname, rinfo->dname_len,
1472 &dvino, ptvino);
1473 }
1474 done:
1475 dout("fill_trace done err=%d\n", err);
1476 return err;
1477 }
1478
1479 /*
1480 * Prepopulate our cache with readdir results, leases, etc.
1481 */
1482 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1483 struct ceph_mds_session *session)
1484 {
1485 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1486 int i, err = 0;
1487
1488 for (i = 0; i < rinfo->dir_nr; i++) {
1489 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1490 struct ceph_vino vino;
1491 struct inode *in;
1492 int rc;
1493
1494 vino.ino = le64_to_cpu(rde->inode.in->ino);
1495 vino.snap = le64_to_cpu(rde->inode.in->snapid);
1496
1497 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1498 if (IS_ERR(in)) {
1499 err = PTR_ERR(in);
1500 dout("new_inode badness got %d\n", err);
1501 continue;
1502 }
1503 rc = fill_inode(in, NULL, &rde->inode, NULL, session,
1504 -1, &req->r_caps_reservation);
1505 if (rc < 0) {
1506 pr_err("fill_inode badness on %p got %d\n", in, rc);
1507 err = rc;
1508 if (in->i_state & I_NEW) {
1509 ihold(in);
1510 discard_new_inode(in);
1511 }
1512 } else if (in->i_state & I_NEW) {
1513 unlock_new_inode(in);
1514 }
1515
1516 /* avoid calling iput_final() in mds dispatch threads */
1517 ceph_async_iput(in);
1518 }
1519
1520 return err;
1521 }
1522
1523 void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1524 {
1525 if (ctl->page) {
1526 kunmap(ctl->page);
1527 put_page(ctl->page);
1528 ctl->page = NULL;
1529 }
1530 }
1531
1532 static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1533 struct ceph_readdir_cache_control *ctl,
1534 struct ceph_mds_request *req)
1535 {
1536 struct ceph_inode_info *ci = ceph_inode(dir);
1537 unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
1538 unsigned idx = ctl->index % nsize;
1539 pgoff_t pgoff = ctl->index / nsize;
1540
1541 if (!ctl->page || pgoff != page_index(ctl->page)) {
1542 ceph_readdir_cache_release(ctl);
1543 if (idx == 0)
1544 ctl->page = grab_cache_page(&dir->i_data, pgoff);
1545 else
1546 ctl->page = find_lock_page(&dir->i_data, pgoff);
1547 if (!ctl->page) {
1548 ctl->index = -1;
1549 return idx == 0 ? -ENOMEM : 0;
1550 }
1551 /* reading/filling the cache are serialized by
1552 * i_mutex, no need to use page lock */
1553 unlock_page(ctl->page);
1554 ctl->dentries = kmap(ctl->page);
1555 if (idx == 0)
1556 memset(ctl->dentries, 0, PAGE_SIZE);
1557 }
1558
1559 if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1560 req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1561 dout("readdir cache dn %p idx %d\n", dn, ctl->index);
1562 ctl->dentries[idx] = dn;
1563 ctl->index++;
1564 } else {
1565 dout("disable readdir cache\n");
1566 ctl->index = -1;
1567 }
1568 return 0;
1569 }
1570
1571 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1572 struct ceph_mds_session *session)
1573 {
1574 struct dentry *parent = req->r_dentry;
1575 struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
1576 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1577 struct qstr dname;
1578 struct dentry *dn;
1579 struct inode *in;
1580 int err = 0, skipped = 0, ret, i;
1581 struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1582 u32 frag = le32_to_cpu(rhead->args.readdir.frag);
1583 u32 last_hash = 0;
1584 u32 fpos_offset;
1585 struct ceph_readdir_cache_control cache_ctl = {};
1586
1587 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
1588 return readdir_prepopulate_inodes_only(req, session);
1589
1590 if (rinfo->hash_order) {
1591 if (req->r_path2) {
1592 last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1593 req->r_path2,
1594 strlen(req->r_path2));
1595 last_hash = ceph_frag_value(last_hash);
1596 } else if (rinfo->offset_hash) {
1597 /* mds understands offset_hash */
1598 WARN_ON_ONCE(req->r_readdir_offset != 2);
1599 last_hash = le32_to_cpu(rhead->args.readdir.offset_hash);
1600 }
1601 }
1602
1603 if (rinfo->dir_dir &&
1604 le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1605 dout("readdir_prepopulate got new frag %x -> %x\n",
1606 frag, le32_to_cpu(rinfo->dir_dir->frag));
1607 frag = le32_to_cpu(rinfo->dir_dir->frag);
1608 if (!rinfo->hash_order)
1609 req->r_readdir_offset = 2;
1610 }
1611
1612 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1613 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1614 rinfo->dir_nr, parent);
1615 } else {
1616 dout("readdir_prepopulate %d items under dn %p\n",
1617 rinfo->dir_nr, parent);
1618 if (rinfo->dir_dir)
1619 ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1620
1621 if (ceph_frag_is_leftmost(frag) &&
1622 req->r_readdir_offset == 2 &&
1623 !(rinfo->hash_order && last_hash)) {
1624 /* note dir version at start of readdir so we can
1625 * tell if any dentries get dropped */
1626 req->r_dir_release_cnt =
1627 atomic64_read(&ci->i_release_count);
1628 req->r_dir_ordered_cnt =
1629 atomic64_read(&ci->i_ordered_count);
1630 req->r_readdir_cache_idx = 0;
1631 }
1632 }
1633
1634 cache_ctl.index = req->r_readdir_cache_idx;
1635 fpos_offset = req->r_readdir_offset;
1636
1637 /* FIXME: release caps/leases if error occurs */
1638 for (i = 0; i < rinfo->dir_nr; i++) {
1639 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1640 struct ceph_vino tvino;
1641
1642 dname.name = rde->name;
1643 dname.len = rde->name_len;
1644 dname.hash = full_name_hash(parent, dname.name, dname.len);
1645
1646 tvino.ino = le64_to_cpu(rde->inode.in->ino);
1647 tvino.snap = le64_to_cpu(rde->inode.in->snapid);
1648
1649 if (rinfo->hash_order) {
1650 u32 hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1651 rde->name, rde->name_len);
1652 hash = ceph_frag_value(hash);
1653 if (hash != last_hash)
1654 fpos_offset = 2;
1655 last_hash = hash;
1656 rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
1657 } else {
1658 rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
1659 }
1660
1661 retry_lookup:
1662 dn = d_lookup(parent, &dname);
1663 dout("d_lookup on parent=%p name=%.*s got %p\n",
1664 parent, dname.len, dname.name, dn);
1665
1666 if (!dn) {
1667 dn = d_alloc(parent, &dname);
1668 dout("d_alloc %p '%.*s' = %p\n", parent,
1669 dname.len, dname.name, dn);
1670 if (!dn) {
1671 dout("d_alloc badness\n");
1672 err = -ENOMEM;
1673 goto out;
1674 }
1675 } else if (d_really_is_positive(dn) &&
1676 (ceph_ino(d_inode(dn)) != tvino.ino ||
1677 ceph_snap(d_inode(dn)) != tvino.snap)) {
1678 struct ceph_dentry_info *di = ceph_dentry(dn);
1679 dout(" dn %p points to wrong inode %p\n",
1680 dn, d_inode(dn));
1681
1682 spin_lock(&dn->d_lock);
1683 if (di->offset > 0 &&
1684 di->lease_shared_gen ==
1685 atomic_read(&ci->i_shared_gen)) {
1686 __ceph_dir_clear_ordered(ci);
1687 di->offset = 0;
1688 }
1689 spin_unlock(&dn->d_lock);
1690
1691 d_delete(dn);
1692 dput(dn);
1693 goto retry_lookup;
1694 }
1695
1696 /* inode */
1697 if (d_really_is_positive(dn)) {
1698 in = d_inode(dn);
1699 } else {
1700 in = ceph_get_inode(parent->d_sb, tvino);
1701 if (IS_ERR(in)) {
1702 dout("new_inode badness\n");
1703 d_drop(dn);
1704 dput(dn);
1705 err = PTR_ERR(in);
1706 goto out;
1707 }
1708 }
1709
1710 ret = fill_inode(in, NULL, &rde->inode, NULL, session,
1711 -1, &req->r_caps_reservation);
1712 if (ret < 0) {
1713 pr_err("fill_inode badness on %p\n", in);
1714 if (d_really_is_negative(dn)) {
1715 /* avoid calling iput_final() in mds
1716 * dispatch threads */
1717 if (in->i_state & I_NEW) {
1718 ihold(in);
1719 discard_new_inode(in);
1720 }
1721 ceph_async_iput(in);
1722 }
1723 d_drop(dn);
1724 err = ret;
1725 goto next_item;
1726 }
1727 if (in->i_state & I_NEW)
1728 unlock_new_inode(in);
1729
1730 if (d_really_is_negative(dn)) {
1731 if (ceph_security_xattr_deadlock(in)) {
1732 dout(" skip splicing dn %p to inode %p"
1733 " (security xattr deadlock)\n", dn, in);
1734 ceph_async_iput(in);
1735 skipped++;
1736 goto next_item;
1737 }
1738
1739 err = splice_dentry(&dn, in);
1740 if (err < 0)
1741 goto next_item;
1742 }
1743
1744 ceph_dentry(dn)->offset = rde->offset;
1745
1746 update_dentry_lease(d_inode(parent), dn,
1747 rde->lease, req->r_session,
1748 req->r_request_started);
1749
1750 if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
1751 ret = fill_readdir_cache(d_inode(parent), dn,
1752 &cache_ctl, req);
1753 if (ret < 0)
1754 err = ret;
1755 }
1756 next_item:
1757 dput(dn);
1758 }
1759 out:
1760 if (err == 0 && skipped == 0) {
1761 set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
1762 req->r_readdir_cache_idx = cache_ctl.index;
1763 }
1764 ceph_readdir_cache_release(&cache_ctl);
1765 dout("readdir_prepopulate done\n");
1766 return err;
1767 }
1768
1769 bool ceph_inode_set_size(struct inode *inode, loff_t size)
1770 {
1771 struct ceph_inode_info *ci = ceph_inode(inode);
1772 bool ret;
1773
1774 spin_lock(&ci->i_ceph_lock);
1775 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1776 i_size_write(inode, size);
1777 inode->i_blocks = calc_inode_blocks(size);
1778
1779 ret = __ceph_should_report_size(ci);
1780
1781 spin_unlock(&ci->i_ceph_lock);
1782 return ret;
1783 }
1784
1785 /*
1786 * Put reference to inode, but avoid calling iput_final() in current thread.
1787 * iput_final() may wait for reahahead pages. The wait can cause deadlock in
1788 * some contexts.
1789 */
1790 void ceph_async_iput(struct inode *inode)
1791 {
1792 if (!inode)
1793 return;
1794 for (;;) {
1795 if (atomic_add_unless(&inode->i_count, -1, 1))
1796 break;
1797 if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1798 &ceph_inode(inode)->i_work))
1799 break;
1800 /* queue work failed, i_count must be at least 2 */
1801 }
1802 }
1803
1804 /*
1805 * Write back inode data in a worker thread. (This can't be done
1806 * in the message handler context.)
1807 */
1808 void ceph_queue_writeback(struct inode *inode)
1809 {
1810 struct ceph_inode_info *ci = ceph_inode(inode);
1811 set_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask);
1812
1813 ihold(inode);
1814 if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1815 &ci->i_work)) {
1816 dout("ceph_queue_writeback %p\n", inode);
1817 } else {
1818 dout("ceph_queue_writeback %p already queued, mask=%lx\n",
1819 inode, ci->i_work_mask);
1820 iput(inode);
1821 }
1822 }
1823
1824 /*
1825 * queue an async invalidation
1826 */
1827 void ceph_queue_invalidate(struct inode *inode)
1828 {
1829 struct ceph_inode_info *ci = ceph_inode(inode);
1830 set_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask);
1831
1832 ihold(inode);
1833 if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1834 &ceph_inode(inode)->i_work)) {
1835 dout("ceph_queue_invalidate %p\n", inode);
1836 } else {
1837 dout("ceph_queue_invalidate %p already queued, mask=%lx\n",
1838 inode, ci->i_work_mask);
1839 iput(inode);
1840 }
1841 }
1842
1843 /*
1844 * Queue an async vmtruncate. If we fail to queue work, we will handle
1845 * the truncation the next time we call __ceph_do_pending_vmtruncate.
1846 */
1847 void ceph_queue_vmtruncate(struct inode *inode)
1848 {
1849 struct ceph_inode_info *ci = ceph_inode(inode);
1850 set_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask);
1851
1852 ihold(inode);
1853 if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1854 &ci->i_work)) {
1855 dout("ceph_queue_vmtruncate %p\n", inode);
1856 } else {
1857 dout("ceph_queue_vmtruncate %p already queued, mask=%lx\n",
1858 inode, ci->i_work_mask);
1859 iput(inode);
1860 }
1861 }
1862
1863 static void ceph_do_invalidate_pages(struct inode *inode)
1864 {
1865 struct ceph_inode_info *ci = ceph_inode(inode);
1866 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1867 u32 orig_gen;
1868 int check = 0;
1869
1870 mutex_lock(&ci->i_truncate_mutex);
1871
1872 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
1873 pr_warn_ratelimited("invalidate_pages %p %lld forced umount\n",
1874 inode, ceph_ino(inode));
1875 mapping_set_error(inode->i_mapping, -EIO);
1876 truncate_pagecache(inode, 0);
1877 mutex_unlock(&ci->i_truncate_mutex);
1878 goto out;
1879 }
1880
1881 spin_lock(&ci->i_ceph_lock);
1882 dout("invalidate_pages %p gen %d revoking %d\n", inode,
1883 ci->i_rdcache_gen, ci->i_rdcache_revoking);
1884 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1885 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1886 check = 1;
1887 spin_unlock(&ci->i_ceph_lock);
1888 mutex_unlock(&ci->i_truncate_mutex);
1889 goto out;
1890 }
1891 orig_gen = ci->i_rdcache_gen;
1892 spin_unlock(&ci->i_ceph_lock);
1893
1894 if (invalidate_inode_pages2(inode->i_mapping) < 0) {
1895 pr_err("invalidate_pages %p fails\n", inode);
1896 }
1897
1898 spin_lock(&ci->i_ceph_lock);
1899 if (orig_gen == ci->i_rdcache_gen &&
1900 orig_gen == ci->i_rdcache_revoking) {
1901 dout("invalidate_pages %p gen %d successful\n", inode,
1902 ci->i_rdcache_gen);
1903 ci->i_rdcache_revoking--;
1904 check = 1;
1905 } else {
1906 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1907 inode, orig_gen, ci->i_rdcache_gen,
1908 ci->i_rdcache_revoking);
1909 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1910 check = 1;
1911 }
1912 spin_unlock(&ci->i_ceph_lock);
1913 mutex_unlock(&ci->i_truncate_mutex);
1914 out:
1915 if (check)
1916 ceph_check_caps(ci, 0, NULL);
1917 }
1918
1919 /*
1920 * Make sure any pending truncation is applied before doing anything
1921 * that may depend on it.
1922 */
1923 void __ceph_do_pending_vmtruncate(struct inode *inode)
1924 {
1925 struct ceph_inode_info *ci = ceph_inode(inode);
1926 u64 to;
1927 int wrbuffer_refs, finish = 0;
1928
1929 mutex_lock(&ci->i_truncate_mutex);
1930 retry:
1931 spin_lock(&ci->i_ceph_lock);
1932 if (ci->i_truncate_pending == 0) {
1933 dout("__do_pending_vmtruncate %p none pending\n", inode);
1934 spin_unlock(&ci->i_ceph_lock);
1935 mutex_unlock(&ci->i_truncate_mutex);
1936 return;
1937 }
1938
1939 /*
1940 * make sure any dirty snapped pages are flushed before we
1941 * possibly truncate them.. so write AND block!
1942 */
1943 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1944 spin_unlock(&ci->i_ceph_lock);
1945 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1946 inode);
1947 filemap_write_and_wait_range(&inode->i_data, 0,
1948 inode->i_sb->s_maxbytes);
1949 goto retry;
1950 }
1951
1952 /* there should be no reader or writer */
1953 WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1954
1955 to = ci->i_truncate_size;
1956 wrbuffer_refs = ci->i_wrbuffer_ref;
1957 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1958 ci->i_truncate_pending, to);
1959 spin_unlock(&ci->i_ceph_lock);
1960
1961 truncate_pagecache(inode, to);
1962
1963 spin_lock(&ci->i_ceph_lock);
1964 if (to == ci->i_truncate_size) {
1965 ci->i_truncate_pending = 0;
1966 finish = 1;
1967 }
1968 spin_unlock(&ci->i_ceph_lock);
1969 if (!finish)
1970 goto retry;
1971
1972 mutex_unlock(&ci->i_truncate_mutex);
1973
1974 if (wrbuffer_refs == 0)
1975 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1976
1977 wake_up_all(&ci->i_cap_wq);
1978 }
1979
1980 static void ceph_inode_work(struct work_struct *work)
1981 {
1982 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1983 i_work);
1984 struct inode *inode = &ci->vfs_inode;
1985
1986 if (test_and_clear_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask)) {
1987 dout("writeback %p\n", inode);
1988 filemap_fdatawrite(&inode->i_data);
1989 }
1990 if (test_and_clear_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask))
1991 ceph_do_invalidate_pages(inode);
1992
1993 if (test_and_clear_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask))
1994 __ceph_do_pending_vmtruncate(inode);
1995
1996 iput(inode);
1997 }
1998
1999 /*
2000 * symlinks
2001 */
2002 static const struct inode_operations ceph_symlink_iops = {
2003 .get_link = simple_get_link,
2004 .setattr = ceph_setattr,
2005 .getattr = ceph_getattr,
2006 .listxattr = ceph_listxattr,
2007 };
2008
2009 int __ceph_setattr(struct inode *inode, struct iattr *attr)
2010 {
2011 struct ceph_inode_info *ci = ceph_inode(inode);
2012 unsigned int ia_valid = attr->ia_valid;
2013 struct ceph_mds_request *req;
2014 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
2015 struct ceph_cap_flush *prealloc_cf;
2016 int issued;
2017 int release = 0, dirtied = 0;
2018 int mask = 0;
2019 int err = 0;
2020 int inode_dirty_flags = 0;
2021 bool lock_snap_rwsem = false;
2022
2023 prealloc_cf = ceph_alloc_cap_flush();
2024 if (!prealloc_cf)
2025 return -ENOMEM;
2026
2027 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
2028 USE_AUTH_MDS);
2029 if (IS_ERR(req)) {
2030 ceph_free_cap_flush(prealloc_cf);
2031 return PTR_ERR(req);
2032 }
2033
2034 spin_lock(&ci->i_ceph_lock);
2035 issued = __ceph_caps_issued(ci, NULL);
2036
2037 if (!ci->i_head_snapc &&
2038 (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
2039 lock_snap_rwsem = true;
2040 if (!down_read_trylock(&mdsc->snap_rwsem)) {
2041 spin_unlock(&ci->i_ceph_lock);
2042 down_read(&mdsc->snap_rwsem);
2043 spin_lock(&ci->i_ceph_lock);
2044 issued = __ceph_caps_issued(ci, NULL);
2045 }
2046 }
2047
2048 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
2049
2050 if (ia_valid & ATTR_UID) {
2051 dout("setattr %p uid %d -> %d\n", inode,
2052 from_kuid(&init_user_ns, inode->i_uid),
2053 from_kuid(&init_user_ns, attr->ia_uid));
2054 if (issued & CEPH_CAP_AUTH_EXCL) {
2055 inode->i_uid = attr->ia_uid;
2056 dirtied |= CEPH_CAP_AUTH_EXCL;
2057 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2058 !uid_eq(attr->ia_uid, inode->i_uid)) {
2059 req->r_args.setattr.uid = cpu_to_le32(
2060 from_kuid(&init_user_ns, attr->ia_uid));
2061 mask |= CEPH_SETATTR_UID;
2062 release |= CEPH_CAP_AUTH_SHARED;
2063 }
2064 }
2065 if (ia_valid & ATTR_GID) {
2066 dout("setattr %p gid %d -> %d\n", inode,
2067 from_kgid(&init_user_ns, inode->i_gid),
2068 from_kgid(&init_user_ns, attr->ia_gid));
2069 if (issued & CEPH_CAP_AUTH_EXCL) {
2070 inode->i_gid = attr->ia_gid;
2071 dirtied |= CEPH_CAP_AUTH_EXCL;
2072 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2073 !gid_eq(attr->ia_gid, inode->i_gid)) {
2074 req->r_args.setattr.gid = cpu_to_le32(
2075 from_kgid(&init_user_ns, attr->ia_gid));
2076 mask |= CEPH_SETATTR_GID;
2077 release |= CEPH_CAP_AUTH_SHARED;
2078 }
2079 }
2080 if (ia_valid & ATTR_MODE) {
2081 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
2082 attr->ia_mode);
2083 if (issued & CEPH_CAP_AUTH_EXCL) {
2084 inode->i_mode = attr->ia_mode;
2085 dirtied |= CEPH_CAP_AUTH_EXCL;
2086 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2087 attr->ia_mode != inode->i_mode) {
2088 inode->i_mode = attr->ia_mode;
2089 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
2090 mask |= CEPH_SETATTR_MODE;
2091 release |= CEPH_CAP_AUTH_SHARED;
2092 }
2093 }
2094
2095 if (ia_valid & ATTR_ATIME) {
2096 dout("setattr %p atime %lld.%ld -> %lld.%ld\n", inode,
2097 inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
2098 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
2099 if (issued & CEPH_CAP_FILE_EXCL) {
2100 ci->i_time_warp_seq++;
2101 inode->i_atime = attr->ia_atime;
2102 dirtied |= CEPH_CAP_FILE_EXCL;
2103 } else if ((issued & CEPH_CAP_FILE_WR) &&
2104 timespec64_compare(&inode->i_atime,
2105 &attr->ia_atime) < 0) {
2106 inode->i_atime = attr->ia_atime;
2107 dirtied |= CEPH_CAP_FILE_WR;
2108 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2109 !timespec64_equal(&inode->i_atime, &attr->ia_atime)) {
2110 ceph_encode_timespec64(&req->r_args.setattr.atime,
2111 &attr->ia_atime);
2112 mask |= CEPH_SETATTR_ATIME;
2113 release |= CEPH_CAP_FILE_SHARED |
2114 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2115 }
2116 }
2117 if (ia_valid & ATTR_SIZE) {
2118 dout("setattr %p size %lld -> %lld\n", inode,
2119 inode->i_size, attr->ia_size);
2120 if ((issued & CEPH_CAP_FILE_EXCL) &&
2121 attr->ia_size > inode->i_size) {
2122 i_size_write(inode, attr->ia_size);
2123 inode->i_blocks = calc_inode_blocks(attr->ia_size);
2124 ci->i_reported_size = attr->ia_size;
2125 dirtied |= CEPH_CAP_FILE_EXCL;
2126 ia_valid |= ATTR_MTIME;
2127 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2128 attr->ia_size != inode->i_size) {
2129 req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
2130 req->r_args.setattr.old_size =
2131 cpu_to_le64(inode->i_size);
2132 mask |= CEPH_SETATTR_SIZE;
2133 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2134 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2135 }
2136 }
2137 if (ia_valid & ATTR_MTIME) {
2138 dout("setattr %p mtime %lld.%ld -> %lld.%ld\n", inode,
2139 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
2140 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
2141 if (issued & CEPH_CAP_FILE_EXCL) {
2142 ci->i_time_warp_seq++;
2143 inode->i_mtime = attr->ia_mtime;
2144 dirtied |= CEPH_CAP_FILE_EXCL;
2145 } else if ((issued & CEPH_CAP_FILE_WR) &&
2146 timespec64_compare(&inode->i_mtime,
2147 &attr->ia_mtime) < 0) {
2148 inode->i_mtime = attr->ia_mtime;
2149 dirtied |= CEPH_CAP_FILE_WR;
2150 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2151 !timespec64_equal(&inode->i_mtime, &attr->ia_mtime)) {
2152 ceph_encode_timespec64(&req->r_args.setattr.mtime,
2153 &attr->ia_mtime);
2154 mask |= CEPH_SETATTR_MTIME;
2155 release |= CEPH_CAP_FILE_SHARED |
2156 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2157 }
2158 }
2159
2160 /* these do nothing */
2161 if (ia_valid & ATTR_CTIME) {
2162 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
2163 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
2164 dout("setattr %p ctime %lld.%ld -> %lld.%ld (%s)\n", inode,
2165 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
2166 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
2167 only ? "ctime only" : "ignored");
2168 if (only) {
2169 /*
2170 * if kernel wants to dirty ctime but nothing else,
2171 * we need to choose a cap to dirty under, or do
2172 * a almost-no-op setattr
2173 */
2174 if (issued & CEPH_CAP_AUTH_EXCL)
2175 dirtied |= CEPH_CAP_AUTH_EXCL;
2176 else if (issued & CEPH_CAP_FILE_EXCL)
2177 dirtied |= CEPH_CAP_FILE_EXCL;
2178 else if (issued & CEPH_CAP_XATTR_EXCL)
2179 dirtied |= CEPH_CAP_XATTR_EXCL;
2180 else
2181 mask |= CEPH_SETATTR_CTIME;
2182 }
2183 }
2184 if (ia_valid & ATTR_FILE)
2185 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
2186
2187 if (dirtied) {
2188 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
2189 &prealloc_cf);
2190 inode->i_ctime = attr->ia_ctime;
2191 }
2192
2193 release &= issued;
2194 spin_unlock(&ci->i_ceph_lock);
2195 if (lock_snap_rwsem)
2196 up_read(&mdsc->snap_rwsem);
2197
2198 if (inode_dirty_flags)
2199 __mark_inode_dirty(inode, inode_dirty_flags);
2200
2201
2202 if (mask) {
2203 req->r_inode = inode;
2204 ihold(inode);
2205 req->r_inode_drop = release;
2206 req->r_args.setattr.mask = cpu_to_le32(mask);
2207 req->r_num_caps = 1;
2208 req->r_stamp = attr->ia_ctime;
2209 err = ceph_mdsc_do_request(mdsc, NULL, req);
2210 }
2211 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
2212 ceph_cap_string(dirtied), mask);
2213
2214 ceph_mdsc_put_request(req);
2215 ceph_free_cap_flush(prealloc_cf);
2216
2217 if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
2218 __ceph_do_pending_vmtruncate(inode);
2219
2220 return err;
2221 }
2222
2223 /*
2224 * setattr
2225 */
2226 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
2227 {
2228 struct inode *inode = d_inode(dentry);
2229 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
2230 int err;
2231
2232 if (ceph_snap(inode) != CEPH_NOSNAP)
2233 return -EROFS;
2234
2235 err = setattr_prepare(dentry, attr);
2236 if (err != 0)
2237 return err;
2238
2239 if ((attr->ia_valid & ATTR_SIZE) &&
2240 attr->ia_size > max(inode->i_size, fsc->max_file_size))
2241 return -EFBIG;
2242
2243 if ((attr->ia_valid & ATTR_SIZE) &&
2244 ceph_quota_is_max_bytes_exceeded(inode, attr->ia_size))
2245 return -EDQUOT;
2246
2247 err = __ceph_setattr(inode, attr);
2248
2249 if (err >= 0 && (attr->ia_valid & ATTR_MODE))
2250 err = posix_acl_chmod(inode, attr->ia_mode);
2251
2252 return err;
2253 }
2254
2255 /*
2256 * Verify that we have a lease on the given mask. If not,
2257 * do a getattr against an mds.
2258 */
2259 int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2260 int mask, bool force)
2261 {
2262 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2263 struct ceph_mds_client *mdsc = fsc->mdsc;
2264 struct ceph_mds_request *req;
2265 int mode;
2266 int err;
2267
2268 if (ceph_snap(inode) == CEPH_SNAPDIR) {
2269 dout("do_getattr inode %p SNAPDIR\n", inode);
2270 return 0;
2271 }
2272
2273 dout("do_getattr inode %p mask %s mode 0%o\n",
2274 inode, ceph_cap_string(mask), inode->i_mode);
2275 if (!force && ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
2276 return 0;
2277
2278 mode = (mask & CEPH_STAT_RSTAT) ? USE_AUTH_MDS : USE_ANY_MDS;
2279 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
2280 if (IS_ERR(req))
2281 return PTR_ERR(req);
2282 req->r_inode = inode;
2283 ihold(inode);
2284 req->r_num_caps = 1;
2285 req->r_args.getattr.mask = cpu_to_le32(mask);
2286 req->r_locked_page = locked_page;
2287 err = ceph_mdsc_do_request(mdsc, NULL, req);
2288 if (locked_page && err == 0) {
2289 u64 inline_version = req->r_reply_info.targeti.inline_version;
2290 if (inline_version == 0) {
2291 /* the reply is supposed to contain inline data */
2292 err = -EINVAL;
2293 } else if (inline_version == CEPH_INLINE_NONE) {
2294 err = -ENODATA;
2295 } else {
2296 err = req->r_reply_info.targeti.inline_len;
2297 }
2298 }
2299 ceph_mdsc_put_request(req);
2300 dout("do_getattr result=%d\n", err);
2301 return err;
2302 }
2303
2304
2305 /*
2306 * Check inode permissions. We verify we have a valid value for
2307 * the AUTH cap, then call the generic handler.
2308 */
2309 int ceph_permission(struct inode *inode, int mask)
2310 {
2311 int err;
2312
2313 if (mask & MAY_NOT_BLOCK)
2314 return -ECHILD;
2315
2316 err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
2317
2318 if (!err)
2319 err = generic_permission(inode, mask);
2320 return err;
2321 }
2322
2323 /* Craft a mask of needed caps given a set of requested statx attrs. */
2324 static int statx_to_caps(u32 want)
2325 {
2326 int mask = 0;
2327
2328 if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME|STATX_BTIME))
2329 mask |= CEPH_CAP_AUTH_SHARED;
2330
2331 if (want & (STATX_NLINK|STATX_CTIME))
2332 mask |= CEPH_CAP_LINK_SHARED;
2333
2334 if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE|
2335 STATX_BLOCKS))
2336 mask |= CEPH_CAP_FILE_SHARED;
2337
2338 if (want & (STATX_CTIME))
2339 mask |= CEPH_CAP_XATTR_SHARED;
2340
2341 return mask;
2342 }
2343
2344 /*
2345 * Get all the attributes. If we have sufficient caps for the requested attrs,
2346 * then we can avoid talking to the MDS at all.
2347 */
2348 int ceph_getattr(const struct path *path, struct kstat *stat,
2349 u32 request_mask, unsigned int flags)
2350 {
2351 struct inode *inode = d_inode(path->dentry);
2352 struct ceph_inode_info *ci = ceph_inode(inode);
2353 u32 valid_mask = STATX_BASIC_STATS;
2354 int err = 0;
2355
2356 /* Skip the getattr altogether if we're asked not to sync */
2357 if (!(flags & AT_STATX_DONT_SYNC)) {
2358 err = ceph_do_getattr(inode, statx_to_caps(request_mask),
2359 flags & AT_STATX_FORCE_SYNC);
2360 if (err)
2361 return err;
2362 }
2363
2364 generic_fillattr(inode, stat);
2365 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
2366
2367 /*
2368 * btime on newly-allocated inodes is 0, so if this is still set to
2369 * that, then assume that it's not valid.
2370 */
2371 if (ci->i_btime.tv_sec || ci->i_btime.tv_nsec) {
2372 stat->btime = ci->i_btime;
2373 valid_mask |= STATX_BTIME;
2374 }
2375
2376 if (ceph_snap(inode) == CEPH_NOSNAP)
2377 stat->dev = inode->i_sb->s_dev;
2378 else
2379 stat->dev = ci->i_snapid_map ? ci->i_snapid_map->dev : 0;
2380
2381 if (S_ISDIR(inode->i_mode)) {
2382 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
2383 RBYTES))
2384 stat->size = ci->i_rbytes;
2385 else
2386 stat->size = ci->i_files + ci->i_subdirs;
2387 stat->blocks = 0;
2388 stat->blksize = 65536;
2389 /*
2390 * Some applications rely on the number of st_nlink
2391 * value on directories to be either 0 (if unlinked)
2392 * or 2 + number of subdirectories.
2393 */
2394 if (stat->nlink == 1)
2395 /* '.' + '..' + subdirs */
2396 stat->nlink = 1 + 1 + ci->i_subdirs;
2397 }
2398
2399 stat->result_mask = request_mask & valid_mask;
2400 return err;
2401 }
Linux with added FPC-III support