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perf bpf: Move perf_event_output() from stdio.h to bpf.h
[linux/fpc-iii.git] / fs / ceph / inode.c
blob79dd5e6ed7559568b666784cae7b728dee72ba1a
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
17 #include "super.h"
18 #include "mds_client.h"
19 #include "cache.h"
20 #include <linux/ceph/decode.h>
21
22 /*
23 * Ceph inode operations
24 *
25 * Implement basic inode helpers (get, alloc) and inode ops (getattr,
26 * setattr, etc.), xattr helpers, and helpers for assimilating
27 * metadata returned by the MDS into our cache.
28 *
29 * Also define helpers for doing asynchronous writeback, invalidation,
30 * and truncation for the benefit of those who can't afford to block
31 * (typically because they are in the message handler path).
32 */
33
34 static const struct inode_operations ceph_symlink_iops;
35
36 static void ceph_invalidate_work(struct work_struct *work);
37 static void ceph_writeback_work(struct work_struct *work);
38 static void ceph_vmtruncate_work(struct work_struct *work);
39
40 /*
41 * find or create an inode, given the ceph ino number
42 */
43 static int ceph_set_ino_cb(struct inode *inode, void *data)
44 {
45 ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
46 inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
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 unlock_new_inode(inode);
62 }
63
64 dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
65 vino.snap, inode);
66 return inode;
67 }
68
69 /*
70 * get/constuct snapdir inode for a given directory
71 */
72 struct inode *ceph_get_snapdir(struct inode *parent)
73 {
74 struct ceph_vino vino = {
75 .ino = ceph_ino(parent),
76 .snap = CEPH_SNAPDIR,
77 };
78 struct inode *inode = ceph_get_inode(parent->i_sb, vino);
79 struct ceph_inode_info *ci = ceph_inode(inode);
80
81 BUG_ON(!S_ISDIR(parent->i_mode));
82 if (IS_ERR(inode))
83 return inode;
84 inode->i_mode = parent->i_mode;
85 inode->i_uid = parent->i_uid;
86 inode->i_gid = parent->i_gid;
87 inode->i_op = &ceph_snapdir_iops;
88 inode->i_fop = &ceph_snapdir_fops;
89 ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
90 ci->i_rbytes = 0;
91 return inode;
92 }
93
94 const struct inode_operations ceph_file_iops = {
95 .permission = ceph_permission,
96 .setattr = ceph_setattr,
97 .getattr = ceph_getattr,
98 .listxattr = ceph_listxattr,
99 .get_acl = ceph_get_acl,
100 .set_acl = ceph_set_acl,
101 };
102
103
104 /*
105 * We use a 'frag tree' to keep track of the MDS's directory fragments
106 * for a given inode (usually there is just a single fragment). We
107 * need to know when a child frag is delegated to a new MDS, or when
108 * it is flagged as replicated, so we can direct our requests
109 * accordingly.
110 */
111
112 /*
113 * find/create a frag in the tree
114 */
115 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
116 u32 f)
117 {
118 struct rb_node **p;
119 struct rb_node *parent = NULL;
120 struct ceph_inode_frag *frag;
121 int c;
122
123 p = &ci->i_fragtree.rb_node;
124 while (*p) {
125 parent = *p;
126 frag = rb_entry(parent, struct ceph_inode_frag, node);
127 c = ceph_frag_compare(f, frag->frag);
128 if (c < 0)
129 p = &(*p)->rb_left;
130 else if (c > 0)
131 p = &(*p)->rb_right;
132 else
133 return frag;
134 }
135
136 frag = kmalloc(sizeof(*frag), GFP_NOFS);
137 if (!frag)
138 return ERR_PTR(-ENOMEM);
139
140 frag->frag = f;
141 frag->split_by = 0;
142 frag->mds = -1;
143 frag->ndist = 0;
144
145 rb_link_node(&frag->node, parent, p);
146 rb_insert_color(&frag->node, &ci->i_fragtree);
147
148 dout("get_or_create_frag added %llx.%llx frag %x\n",
149 ceph_vinop(&ci->vfs_inode), f);
150 return frag;
151 }
152
153 /*
154 * find a specific frag @f
155 */
156 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
157 {
158 struct rb_node *n = ci->i_fragtree.rb_node;
159
160 while (n) {
161 struct ceph_inode_frag *frag =
162 rb_entry(n, struct ceph_inode_frag, node);
163 int c = ceph_frag_compare(f, frag->frag);
164 if (c < 0)
165 n = n->rb_left;
166 else if (c > 0)
167 n = n->rb_right;
168 else
169 return frag;
170 }
171 return NULL;
172 }
173
174 /*
175 * Choose frag containing the given value @v. If @pfrag is
176 * specified, copy the frag delegation info to the caller if
177 * it is present.
178 */
179 static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
180 struct ceph_inode_frag *pfrag, int *found)
181 {
182 u32 t = ceph_frag_make(0, 0);
183 struct ceph_inode_frag *frag;
184 unsigned nway, i;
185 u32 n;
186
187 if (found)
188 *found = 0;
189
190 while (1) {
191 WARN_ON(!ceph_frag_contains_value(t, v));
192 frag = __ceph_find_frag(ci, t);
193 if (!frag)
194 break; /* t is a leaf */
195 if (frag->split_by == 0) {
196 if (pfrag)
197 memcpy(pfrag, frag, sizeof(*pfrag));
198 if (found)
199 *found = 1;
200 break;
201 }
202
203 /* choose child */
204 nway = 1 << frag->split_by;
205 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
206 frag->split_by, nway);
207 for (i = 0; i < nway; i++) {
208 n = ceph_frag_make_child(t, frag->split_by, i);
209 if (ceph_frag_contains_value(n, v)) {
210 t = n;
211 break;
212 }
213 }
214 BUG_ON(i == nway);
215 }
216 dout("choose_frag(%x) = %x\n", v, t);
217
218 return t;
219 }
220
221 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
222 struct ceph_inode_frag *pfrag, int *found)
223 {
224 u32 ret;
225 mutex_lock(&ci->i_fragtree_mutex);
226 ret = __ceph_choose_frag(ci, v, pfrag, found);
227 mutex_unlock(&ci->i_fragtree_mutex);
228 return ret;
229 }
230
231 /*
232 * Process dirfrag (delegation) info from the mds. Include leaf
233 * fragment in tree ONLY if ndist > 0. Otherwise, only
234 * branches/splits are included in i_fragtree)
235 */
236 static int ceph_fill_dirfrag(struct inode *inode,
237 struct ceph_mds_reply_dirfrag *dirinfo)
238 {
239 struct ceph_inode_info *ci = ceph_inode(inode);
240 struct ceph_inode_frag *frag;
241 u32 id = le32_to_cpu(dirinfo->frag);
242 int mds = le32_to_cpu(dirinfo->auth);
243 int ndist = le32_to_cpu(dirinfo->ndist);
244 int diri_auth = -1;
245 int i;
246 int err = 0;
247
248 spin_lock(&ci->i_ceph_lock);
249 if (ci->i_auth_cap)
250 diri_auth = ci->i_auth_cap->mds;
251 spin_unlock(&ci->i_ceph_lock);
252
253 if (mds == -1) /* CDIR_AUTH_PARENT */
254 mds = diri_auth;
255
256 mutex_lock(&ci->i_fragtree_mutex);
257 if (ndist == 0 && mds == diri_auth) {
258 /* no delegation info needed. */
259 frag = __ceph_find_frag(ci, id);
260 if (!frag)
261 goto out;
262 if (frag->split_by == 0) {
263 /* tree leaf, remove */
264 dout("fill_dirfrag removed %llx.%llx frag %x"
265 " (no ref)\n", ceph_vinop(inode), id);
266 rb_erase(&frag->node, &ci->i_fragtree);
267 kfree(frag);
268 } else {
269 /* tree branch, keep and clear */
270 dout("fill_dirfrag cleared %llx.%llx frag %x"
271 " referral\n", ceph_vinop(inode), id);
272 frag->mds = -1;
273 frag->ndist = 0;
274 }
275 goto out;
276 }
277
278
279 /* find/add this frag to store mds delegation info */
280 frag = __get_or_create_frag(ci, id);
281 if (IS_ERR(frag)) {
282 /* this is not the end of the world; we can continue
283 with bad/inaccurate delegation info */
284 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
285 ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
286 err = -ENOMEM;
287 goto out;
288 }
289
290 frag->mds = mds;
291 frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
292 for (i = 0; i < frag->ndist; i++)
293 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
294 dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
295 ceph_vinop(inode), frag->frag, frag->ndist);
296
297 out:
298 mutex_unlock(&ci->i_fragtree_mutex);
299 return err;
300 }
301
302 static int frag_tree_split_cmp(const void *l, const void *r)
303 {
304 struct ceph_frag_tree_split *ls = (struct ceph_frag_tree_split*)l;
305 struct ceph_frag_tree_split *rs = (struct ceph_frag_tree_split*)r;
306 return ceph_frag_compare(le32_to_cpu(ls->frag),
307 le32_to_cpu(rs->frag));
308 }
309
310 static bool is_frag_child(u32 f, struct ceph_inode_frag *frag)
311 {
312 if (!frag)
313 return f == ceph_frag_make(0, 0);
314 if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by)
315 return false;
316 return ceph_frag_contains_value(frag->frag, ceph_frag_value(f));
317 }
318
319 static int ceph_fill_fragtree(struct inode *inode,
320 struct ceph_frag_tree_head *fragtree,
321 struct ceph_mds_reply_dirfrag *dirinfo)
322 {
323 struct ceph_inode_info *ci = ceph_inode(inode);
324 struct ceph_inode_frag *frag, *prev_frag = NULL;
325 struct rb_node *rb_node;
326 unsigned i, split_by, nsplits;
327 u32 id;
328 bool update = false;
329
330 mutex_lock(&ci->i_fragtree_mutex);
331 nsplits = le32_to_cpu(fragtree->nsplits);
332 if (nsplits != ci->i_fragtree_nsplits) {
333 update = true;
334 } else if (nsplits) {
335 i = prandom_u32() % nsplits;
336 id = le32_to_cpu(fragtree->splits[i].frag);
337 if (!__ceph_find_frag(ci, id))
338 update = true;
339 } else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) {
340 rb_node = rb_first(&ci->i_fragtree);
341 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
342 if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node))
343 update = true;
344 }
345 if (!update && dirinfo) {
346 id = le32_to_cpu(dirinfo->frag);
347 if (id != __ceph_choose_frag(ci, id, NULL, NULL))
348 update = true;
349 }
350 if (!update)
351 goto out_unlock;
352
353 if (nsplits > 1) {
354 sort(fragtree->splits, nsplits, sizeof(fragtree->splits[0]),
355 frag_tree_split_cmp, NULL);
356 }
357
358 dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode));
359 rb_node = rb_first(&ci->i_fragtree);
360 for (i = 0; i < nsplits; i++) {
361 id = le32_to_cpu(fragtree->splits[i].frag);
362 split_by = le32_to_cpu(fragtree->splits[i].by);
363 if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) {
364 pr_err("fill_fragtree %llx.%llx invalid split %d/%u, "
365 "frag %x split by %d\n", ceph_vinop(inode),
366 i, nsplits, id, split_by);
367 continue;
368 }
369 frag = NULL;
370 while (rb_node) {
371 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
372 if (ceph_frag_compare(frag->frag, id) >= 0) {
373 if (frag->frag != id)
374 frag = NULL;
375 else
376 rb_node = rb_next(rb_node);
377 break;
378 }
379 rb_node = rb_next(rb_node);
380 /* delete stale split/leaf node */
381 if (frag->split_by > 0 ||
382 !is_frag_child(frag->frag, prev_frag)) {
383 rb_erase(&frag->node, &ci->i_fragtree);
384 if (frag->split_by > 0)
385 ci->i_fragtree_nsplits--;
386 kfree(frag);
387 }
388 frag = NULL;
389 }
390 if (!frag) {
391 frag = __get_or_create_frag(ci, id);
392 if (IS_ERR(frag))
393 continue;
394 }
395 if (frag->split_by == 0)
396 ci->i_fragtree_nsplits++;
397 frag->split_by = split_by;
398 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
399 prev_frag = frag;
400 }
401 while (rb_node) {
402 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
403 rb_node = rb_next(rb_node);
404 /* delete stale split/leaf node */
405 if (frag->split_by > 0 ||
406 !is_frag_child(frag->frag, prev_frag)) {
407 rb_erase(&frag->node, &ci->i_fragtree);
408 if (frag->split_by > 0)
409 ci->i_fragtree_nsplits--;
410 kfree(frag);
411 }
412 }
413 out_unlock:
414 mutex_unlock(&ci->i_fragtree_mutex);
415 return 0;
416 }
417
418 /*
419 * initialize a newly allocated inode.
420 */
421 struct inode *ceph_alloc_inode(struct super_block *sb)
422 {
423 struct ceph_inode_info *ci;
424 int i;
425
426 ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
427 if (!ci)
428 return NULL;
429
430 dout("alloc_inode %p\n", &ci->vfs_inode);
431
432 spin_lock_init(&ci->i_ceph_lock);
433
434 ci->i_version = 0;
435 ci->i_inline_version = 0;
436 ci->i_time_warp_seq = 0;
437 ci->i_ceph_flags = 0;
438 atomic64_set(&ci->i_ordered_count, 1);
439 atomic64_set(&ci->i_release_count, 1);
440 atomic64_set(&ci->i_complete_seq[0], 0);
441 atomic64_set(&ci->i_complete_seq[1], 0);
442 ci->i_symlink = NULL;
443
444 ci->i_max_bytes = 0;
445 ci->i_max_files = 0;
446
447 memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
448 RCU_INIT_POINTER(ci->i_layout.pool_ns, NULL);
449
450 ci->i_fragtree = RB_ROOT;
451 mutex_init(&ci->i_fragtree_mutex);
452
453 ci->i_xattrs.blob = NULL;
454 ci->i_xattrs.prealloc_blob = NULL;
455 ci->i_xattrs.dirty = false;
456 ci->i_xattrs.index = RB_ROOT;
457 ci->i_xattrs.count = 0;
458 ci->i_xattrs.names_size = 0;
459 ci->i_xattrs.vals_size = 0;
460 ci->i_xattrs.version = 0;
461 ci->i_xattrs.index_version = 0;
462
463 ci->i_caps = RB_ROOT;
464 ci->i_auth_cap = NULL;
465 ci->i_dirty_caps = 0;
466 ci->i_flushing_caps = 0;
467 INIT_LIST_HEAD(&ci->i_dirty_item);
468 INIT_LIST_HEAD(&ci->i_flushing_item);
469 ci->i_prealloc_cap_flush = NULL;
470 INIT_LIST_HEAD(&ci->i_cap_flush_list);
471 init_waitqueue_head(&ci->i_cap_wq);
472 ci->i_hold_caps_min = 0;
473 ci->i_hold_caps_max = 0;
474 INIT_LIST_HEAD(&ci->i_cap_delay_list);
475 INIT_LIST_HEAD(&ci->i_cap_snaps);
476 ci->i_head_snapc = NULL;
477 ci->i_snap_caps = 0;
478
479 for (i = 0; i < CEPH_FILE_MODE_BITS; i++)
480 ci->i_nr_by_mode[i] = 0;
481
482 mutex_init(&ci->i_truncate_mutex);
483 ci->i_truncate_seq = 0;
484 ci->i_truncate_size = 0;
485 ci->i_truncate_pending = 0;
486
487 ci->i_max_size = 0;
488 ci->i_reported_size = 0;
489 ci->i_wanted_max_size = 0;
490 ci->i_requested_max_size = 0;
491
492 ci->i_pin_ref = 0;
493 ci->i_rd_ref = 0;
494 ci->i_rdcache_ref = 0;
495 ci->i_wr_ref = 0;
496 ci->i_wb_ref = 0;
497 ci->i_wrbuffer_ref = 0;
498 ci->i_wrbuffer_ref_head = 0;
499 atomic_set(&ci->i_filelock_ref, 0);
500 atomic_set(&ci->i_shared_gen, 0);
501 ci->i_rdcache_gen = 0;
502 ci->i_rdcache_revoking = 0;
503
504 INIT_LIST_HEAD(&ci->i_unsafe_dirops);
505 INIT_LIST_HEAD(&ci->i_unsafe_iops);
506 spin_lock_init(&ci->i_unsafe_lock);
507
508 ci->i_snap_realm = NULL;
509 INIT_LIST_HEAD(&ci->i_snap_realm_item);
510 INIT_LIST_HEAD(&ci->i_snap_flush_item);
511
512 INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
513 INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
514
515 INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
516
517 ceph_fscache_inode_init(ci);
518
519 return &ci->vfs_inode;
520 }
521
522 static void ceph_i_callback(struct rcu_head *head)
523 {
524 struct inode *inode = container_of(head, struct inode, i_rcu);
525 struct ceph_inode_info *ci = ceph_inode(inode);
526
527 kmem_cache_free(ceph_inode_cachep, ci);
528 }
529
530 void ceph_destroy_inode(struct inode *inode)
531 {
532 struct ceph_inode_info *ci = ceph_inode(inode);
533 struct ceph_inode_frag *frag;
534 struct rb_node *n;
535
536 dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
537
538 ceph_fscache_unregister_inode_cookie(ci);
539
540 ceph_queue_caps_release(inode);
541
542 if (__ceph_has_any_quota(ci))
543 ceph_adjust_quota_realms_count(inode, false);
544
545 /*
546 * we may still have a snap_realm reference if there are stray
547 * caps in i_snap_caps.
548 */
549 if (ci->i_snap_realm) {
550 struct ceph_mds_client *mdsc =
551 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
552 struct ceph_snap_realm *realm = ci->i_snap_realm;
553
554 dout(" dropping residual ref to snap realm %p\n", realm);
555 spin_lock(&realm->inodes_with_caps_lock);
556 list_del_init(&ci->i_snap_realm_item);
557 ci->i_snap_realm = NULL;
558 if (realm->ino == ci->i_vino.ino)
559 realm->inode = NULL;
560 spin_unlock(&realm->inodes_with_caps_lock);
561 ceph_put_snap_realm(mdsc, realm);
562 }
563
564 kfree(ci->i_symlink);
565 while ((n = rb_first(&ci->i_fragtree)) != NULL) {
566 frag = rb_entry(n, struct ceph_inode_frag, node);
567 rb_erase(n, &ci->i_fragtree);
568 kfree(frag);
569 }
570 ci->i_fragtree_nsplits = 0;
571
572 __ceph_destroy_xattrs(ci);
573 if (ci->i_xattrs.blob)
574 ceph_buffer_put(ci->i_xattrs.blob);
575 if (ci->i_xattrs.prealloc_blob)
576 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
577
578 ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns));
579
580 call_rcu(&inode->i_rcu, ceph_i_callback);
581 }
582
583 int ceph_drop_inode(struct inode *inode)
584 {
585 /*
586 * Positve dentry and corresponding inode are always accompanied
587 * in MDS reply. So no need to keep inode in the cache after
588 * dropping all its aliases.
589 */
590 return 1;
591 }
592
593 static inline blkcnt_t calc_inode_blocks(u64 size)
594 {
595 return (size + (1<<9) - 1) >> 9;
596 }
597
598 /*
599 * Helpers to fill in size, ctime, mtime, and atime. We have to be
600 * careful because either the client or MDS may have more up to date
601 * info, depending on which capabilities are held, and whether
602 * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime
603 * and size are monotonically increasing, except when utimes() or
604 * truncate() increments the corresponding _seq values.)
605 */
606 int ceph_fill_file_size(struct inode *inode, int issued,
607 u32 truncate_seq, u64 truncate_size, u64 size)
608 {
609 struct ceph_inode_info *ci = ceph_inode(inode);
610 int queue_trunc = 0;
611
612 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
613 (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
614 dout("size %lld -> %llu\n", inode->i_size, size);
615 if (size > 0 && S_ISDIR(inode->i_mode)) {
616 pr_err("fill_file_size non-zero size for directory\n");
617 size = 0;
618 }
619 i_size_write(inode, size);
620 inode->i_blocks = calc_inode_blocks(size);
621 ci->i_reported_size = size;
622 if (truncate_seq != ci->i_truncate_seq) {
623 dout("truncate_seq %u -> %u\n",
624 ci->i_truncate_seq, truncate_seq);
625 ci->i_truncate_seq = truncate_seq;
626
627 /* the MDS should have revoked these caps */
628 WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
629 CEPH_CAP_FILE_RD |
630 CEPH_CAP_FILE_WR |
631 CEPH_CAP_FILE_LAZYIO));
632 /*
633 * If we hold relevant caps, or in the case where we're
634 * not the only client referencing this file and we
635 * don't hold those caps, then we need to check whether
636 * the file is either opened or mmaped
637 */
638 if ((issued & (CEPH_CAP_FILE_CACHE|
639 CEPH_CAP_FILE_BUFFER)) ||
640 mapping_mapped(inode->i_mapping) ||
641 __ceph_caps_file_wanted(ci)) {
642 ci->i_truncate_pending++;
643 queue_trunc = 1;
644 }
645 }
646 }
647 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
648 ci->i_truncate_size != truncate_size) {
649 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
650 truncate_size);
651 ci->i_truncate_size = truncate_size;
652 }
653
654 if (queue_trunc)
655 ceph_fscache_invalidate(inode);
656
657 return queue_trunc;
658 }
659
660 void ceph_fill_file_time(struct inode *inode, int issued,
661 u64 time_warp_seq, struct timespec64 *ctime,
662 struct timespec64 *mtime, struct timespec64 *atime)
663 {
664 struct ceph_inode_info *ci = ceph_inode(inode);
665 int warn = 0;
666
667 if (issued & (CEPH_CAP_FILE_EXCL|
668 CEPH_CAP_FILE_WR|
669 CEPH_CAP_FILE_BUFFER|
670 CEPH_CAP_AUTH_EXCL|
671 CEPH_CAP_XATTR_EXCL)) {
672 if (ci->i_version == 0 ||
673 timespec64_compare(ctime, &inode->i_ctime) > 0) {
674 dout("ctime %lld.%09ld -> %lld.%09ld inc w/ cap\n",
675 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
676 ctime->tv_sec, ctime->tv_nsec);
677 inode->i_ctime = *ctime;
678 }
679 if (ci->i_version == 0 ||
680 ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
681 /* the MDS did a utimes() */
682 dout("mtime %lld.%09ld -> %lld.%09ld "
683 "tw %d -> %d\n",
684 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
685 mtime->tv_sec, mtime->tv_nsec,
686 ci->i_time_warp_seq, (int)time_warp_seq);
687
688 inode->i_mtime = *mtime;
689 inode->i_atime = *atime;
690 ci->i_time_warp_seq = time_warp_seq;
691 } else if (time_warp_seq == ci->i_time_warp_seq) {
692 /* nobody did utimes(); take the max */
693 if (timespec64_compare(mtime, &inode->i_mtime) > 0) {
694 dout("mtime %lld.%09ld -> %lld.%09ld inc\n",
695 inode->i_mtime.tv_sec,
696 inode->i_mtime.tv_nsec,
697 mtime->tv_sec, mtime->tv_nsec);
698 inode->i_mtime = *mtime;
699 }
700 if (timespec64_compare(atime, &inode->i_atime) > 0) {
701 dout("atime %lld.%09ld -> %lld.%09ld inc\n",
702 inode->i_atime.tv_sec,
703 inode->i_atime.tv_nsec,
704 atime->tv_sec, atime->tv_nsec);
705 inode->i_atime = *atime;
706 }
707 } else if (issued & CEPH_CAP_FILE_EXCL) {
708 /* we did a utimes(); ignore mds values */
709 } else {
710 warn = 1;
711 }
712 } else {
713 /* we have no write|excl caps; whatever the MDS says is true */
714 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
715 inode->i_ctime = *ctime;
716 inode->i_mtime = *mtime;
717 inode->i_atime = *atime;
718 ci->i_time_warp_seq = time_warp_seq;
719 } else {
720 warn = 1;
721 }
722 }
723 if (warn) /* time_warp_seq shouldn't go backwards */
724 dout("%p mds time_warp_seq %llu < %u\n",
725 inode, time_warp_seq, ci->i_time_warp_seq);
726 }
727
728 /*
729 * Populate an inode based on info from mds. May be called on new or
730 * existing inodes.
731 */
732 static int fill_inode(struct inode *inode, struct page *locked_page,
733 struct ceph_mds_reply_info_in *iinfo,
734 struct ceph_mds_reply_dirfrag *dirinfo,
735 struct ceph_mds_session *session,
736 unsigned long ttl_from, int cap_fmode,
737 struct ceph_cap_reservation *caps_reservation)
738 {
739 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
740 struct ceph_mds_reply_inode *info = iinfo->in;
741 struct ceph_inode_info *ci = ceph_inode(inode);
742 int issued, new_issued, info_caps;
743 struct timespec64 mtime, atime, ctime;
744 struct ceph_buffer *xattr_blob = NULL;
745 struct ceph_string *pool_ns = NULL;
746 struct ceph_cap *new_cap = NULL;
747 int err = 0;
748 bool wake = false;
749 bool queue_trunc = false;
750 bool new_version = false;
751 bool fill_inline = false;
752
753 dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
754 inode, ceph_vinop(inode), le64_to_cpu(info->version),
755 ci->i_version);
756
757 info_caps = le32_to_cpu(info->cap.caps);
758
759 /* prealloc new cap struct */
760 if (info_caps && ceph_snap(inode) == CEPH_NOSNAP)
761 new_cap = ceph_get_cap(mdsc, caps_reservation);
762
763 /*
764 * prealloc xattr data, if it looks like we'll need it. only
765 * if len > 4 (meaning there are actually xattrs; the first 4
766 * bytes are the xattr count).
767 */
768 if (iinfo->xattr_len > 4) {
769 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
770 if (!xattr_blob)
771 pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
772 iinfo->xattr_len);
773 }
774
775 if (iinfo->pool_ns_len > 0)
776 pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data,
777 iinfo->pool_ns_len);
778
779 spin_lock(&ci->i_ceph_lock);
780
781 /*
782 * provided version will be odd if inode value is projected,
783 * even if stable. skip the update if we have newer stable
784 * info (ours>=theirs, e.g. due to racing mds replies), unless
785 * we are getting projected (unstable) info (in which case the
786 * version is odd, and we want ours>theirs).
787 * us them
788 * 2 2 skip
789 * 3 2 skip
790 * 3 3 update
791 */
792 if (ci->i_version == 0 ||
793 ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
794 le64_to_cpu(info->version) > (ci->i_version & ~1)))
795 new_version = true;
796
797 __ceph_caps_issued(ci, &issued);
798 issued |= __ceph_caps_dirty(ci);
799 new_issued = ~issued & info_caps;
800
801 /* update inode */
802 inode->i_rdev = le32_to_cpu(info->rdev);
803 inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
804
805 __ceph_update_quota(ci, iinfo->max_bytes, iinfo->max_files);
806
807 if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
808 (issued & CEPH_CAP_AUTH_EXCL) == 0) {
809 inode->i_mode = le32_to_cpu(info->mode);
810 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
811 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
812 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
813 from_kuid(&init_user_ns, inode->i_uid),
814 from_kgid(&init_user_ns, inode->i_gid));
815 }
816
817 if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
818 (issued & CEPH_CAP_LINK_EXCL) == 0)
819 set_nlink(inode, le32_to_cpu(info->nlink));
820
821 if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
822 /* be careful with mtime, atime, size */
823 ceph_decode_timespec64(&atime, &info->atime);
824 ceph_decode_timespec64(&mtime, &info->mtime);
825 ceph_decode_timespec64(&ctime, &info->ctime);
826 ceph_fill_file_time(inode, issued,
827 le32_to_cpu(info->time_warp_seq),
828 &ctime, &mtime, &atime);
829 }
830
831 if (new_version || (info_caps & CEPH_CAP_FILE_SHARED)) {
832 ci->i_files = le64_to_cpu(info->files);
833 ci->i_subdirs = le64_to_cpu(info->subdirs);
834 }
835
836 if (new_version ||
837 (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
838 s64 old_pool = ci->i_layout.pool_id;
839 struct ceph_string *old_ns;
840
841 ceph_file_layout_from_legacy(&ci->i_layout, &info->layout);
842 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
843 lockdep_is_held(&ci->i_ceph_lock));
844 rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns);
845
846 if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns)
847 ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
848
849 pool_ns = old_ns;
850
851 queue_trunc = ceph_fill_file_size(inode, issued,
852 le32_to_cpu(info->truncate_seq),
853 le64_to_cpu(info->truncate_size),
854 le64_to_cpu(info->size));
855 /* only update max_size on auth cap */
856 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
857 ci->i_max_size != le64_to_cpu(info->max_size)) {
858 dout("max_size %lld -> %llu\n", ci->i_max_size,
859 le64_to_cpu(info->max_size));
860 ci->i_max_size = le64_to_cpu(info->max_size);
861 }
862 }
863
864 /* layout and rstat are not tracked by capability, update them if
865 * the inode info is from auth mds */
866 if (new_version || (info->cap.flags & CEPH_CAP_FLAG_AUTH)) {
867 if (S_ISDIR(inode->i_mode)) {
868 ci->i_dir_layout = iinfo->dir_layout;
869 ci->i_rbytes = le64_to_cpu(info->rbytes);
870 ci->i_rfiles = le64_to_cpu(info->rfiles);
871 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
872 ceph_decode_timespec64(&ci->i_rctime, &info->rctime);
873 }
874 }
875
876 /* xattrs */
877 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
878 if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL)) &&
879 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
880 if (ci->i_xattrs.blob)
881 ceph_buffer_put(ci->i_xattrs.blob);
882 ci->i_xattrs.blob = xattr_blob;
883 if (xattr_blob)
884 memcpy(ci->i_xattrs.blob->vec.iov_base,
885 iinfo->xattr_data, iinfo->xattr_len);
886 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
887 ceph_forget_all_cached_acls(inode);
888 xattr_blob = NULL;
889 }
890
891 /* finally update i_version */
892 if (le64_to_cpu(info->version) > ci->i_version)
893 ci->i_version = le64_to_cpu(info->version);
894
895 inode->i_mapping->a_ops = &ceph_aops;
896
897 switch (inode->i_mode & S_IFMT) {
898 case S_IFIFO:
899 case S_IFBLK:
900 case S_IFCHR:
901 case S_IFSOCK:
902 init_special_inode(inode, inode->i_mode, inode->i_rdev);
903 inode->i_op = &ceph_file_iops;
904 break;
905 case S_IFREG:
906 inode->i_op = &ceph_file_iops;
907 inode->i_fop = &ceph_file_fops;
908 break;
909 case S_IFLNK:
910 inode->i_op = &ceph_symlink_iops;
911 if (!ci->i_symlink) {
912 u32 symlen = iinfo->symlink_len;
913 char *sym;
914
915 spin_unlock(&ci->i_ceph_lock);
916
917 if (symlen != i_size_read(inode)) {
918 pr_err("fill_inode %llx.%llx BAD symlink "
919 "size %lld\n", ceph_vinop(inode),
920 i_size_read(inode));
921 i_size_write(inode, symlen);
922 inode->i_blocks = calc_inode_blocks(symlen);
923 }
924
925 err = -ENOMEM;
926 sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
927 if (!sym)
928 goto out;
929
930 spin_lock(&ci->i_ceph_lock);
931 if (!ci->i_symlink)
932 ci->i_symlink = sym;
933 else
934 kfree(sym); /* lost a race */
935 }
936 inode->i_link = ci->i_symlink;
937 break;
938 case S_IFDIR:
939 inode->i_op = &ceph_dir_iops;
940 inode->i_fop = &ceph_dir_fops;
941 break;
942 default:
943 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
944 ceph_vinop(inode), inode->i_mode);
945 }
946
947 /* were we issued a capability? */
948 if (info_caps) {
949 if (ceph_snap(inode) == CEPH_NOSNAP) {
950 ceph_add_cap(inode, session,
951 le64_to_cpu(info->cap.cap_id),
952 cap_fmode, info_caps,
953 le32_to_cpu(info->cap.wanted),
954 le32_to_cpu(info->cap.seq),
955 le32_to_cpu(info->cap.mseq),
956 le64_to_cpu(info->cap.realm),
957 info->cap.flags, &new_cap);
958
959 /* set dir completion flag? */
960 if (S_ISDIR(inode->i_mode) &&
961 ci->i_files == 0 && ci->i_subdirs == 0 &&
962 (info_caps & CEPH_CAP_FILE_SHARED) &&
963 (issued & CEPH_CAP_FILE_EXCL) == 0 &&
964 !__ceph_dir_is_complete(ci)) {
965 dout(" marking %p complete (empty)\n", inode);
966 i_size_write(inode, 0);
967 __ceph_dir_set_complete(ci,
968 atomic64_read(&ci->i_release_count),
969 atomic64_read(&ci->i_ordered_count));
970 }
971
972 wake = true;
973 } else {
974 dout(" %p got snap_caps %s\n", inode,
975 ceph_cap_string(info_caps));
976 ci->i_snap_caps |= info_caps;
977 if (cap_fmode >= 0)
978 __ceph_get_fmode(ci, cap_fmode);
979 }
980 } else if (cap_fmode >= 0) {
981 pr_warn("mds issued no caps on %llx.%llx\n",
982 ceph_vinop(inode));
983 __ceph_get_fmode(ci, cap_fmode);
984 }
985
986 if (iinfo->inline_version > 0 &&
987 iinfo->inline_version >= ci->i_inline_version) {
988 int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
989 ci->i_inline_version = iinfo->inline_version;
990 if (ci->i_inline_version != CEPH_INLINE_NONE &&
991 (locked_page || (info_caps & cache_caps)))
992 fill_inline = true;
993 }
994
995 spin_unlock(&ci->i_ceph_lock);
996
997 if (fill_inline)
998 ceph_fill_inline_data(inode, locked_page,
999 iinfo->inline_data, iinfo->inline_len);
1000
1001 if (wake)
1002 wake_up_all(&ci->i_cap_wq);
1003
1004 /* queue truncate if we saw i_size decrease */
1005 if (queue_trunc)
1006 ceph_queue_vmtruncate(inode);
1007
1008 /* populate frag tree */
1009 if (S_ISDIR(inode->i_mode))
1010 ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
1011
1012 /* update delegation info? */
1013 if (dirinfo)
1014 ceph_fill_dirfrag(inode, dirinfo);
1015
1016 err = 0;
1017 out:
1018 if (new_cap)
1019 ceph_put_cap(mdsc, new_cap);
1020 if (xattr_blob)
1021 ceph_buffer_put(xattr_blob);
1022 ceph_put_string(pool_ns);
1023 return err;
1024 }
1025
1026 /*
1027 * caller should hold session s_mutex.
1028 */
1029 static void update_dentry_lease(struct dentry *dentry,
1030 struct ceph_mds_reply_lease *lease,
1031 struct ceph_mds_session *session,
1032 unsigned long from_time,
1033 struct ceph_vino *tgt_vino,
1034 struct ceph_vino *dir_vino)
1035 {
1036 struct ceph_dentry_info *di = ceph_dentry(dentry);
1037 long unsigned duration = le32_to_cpu(lease->duration_ms);
1038 long unsigned ttl = from_time + (duration * HZ) / 1000;
1039 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
1040 struct inode *dir;
1041 struct ceph_mds_session *old_lease_session = NULL;
1042
1043 /*
1044 * Make sure dentry's inode matches tgt_vino. NULL tgt_vino means that
1045 * we expect a negative dentry.
1046 */
1047 if (!tgt_vino && d_really_is_positive(dentry))
1048 return;
1049
1050 if (tgt_vino && (d_really_is_negative(dentry) ||
1051 !ceph_ino_compare(d_inode(dentry), tgt_vino)))
1052 return;
1053
1054 spin_lock(&dentry->d_lock);
1055 dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
1056 dentry, duration, ttl);
1057
1058 dir = d_inode(dentry->d_parent);
1059
1060 /* make sure parent matches dir_vino */
1061 if (!ceph_ino_compare(dir, dir_vino))
1062 goto out_unlock;
1063
1064 /* only track leases on regular dentries */
1065 if (ceph_snap(dir) != CEPH_NOSNAP)
1066 goto out_unlock;
1067
1068 di->lease_shared_gen = atomic_read(&ceph_inode(dir)->i_shared_gen);
1069
1070 if (duration == 0)
1071 goto out_unlock;
1072
1073 if (di->lease_gen == session->s_cap_gen &&
1074 time_before(ttl, di->time))
1075 goto out_unlock; /* we already have a newer lease. */
1076
1077 if (di->lease_session && di->lease_session != session) {
1078 old_lease_session = di->lease_session;
1079 di->lease_session = NULL;
1080 }
1081
1082 ceph_dentry_lru_touch(dentry);
1083
1084 if (!di->lease_session)
1085 di->lease_session = ceph_get_mds_session(session);
1086 di->lease_gen = session->s_cap_gen;
1087 di->lease_seq = le32_to_cpu(lease->seq);
1088 di->lease_renew_after = half_ttl;
1089 di->lease_renew_from = 0;
1090 di->time = ttl;
1091 out_unlock:
1092 spin_unlock(&dentry->d_lock);
1093 if (old_lease_session)
1094 ceph_put_mds_session(old_lease_session);
1095 }
1096
1097 /*
1098 * splice a dentry to an inode.
1099 * caller must hold directory i_mutex for this to be safe.
1100 */
1101 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in)
1102 {
1103 struct dentry *realdn;
1104
1105 BUG_ON(d_inode(dn));
1106
1107 if (S_ISDIR(in->i_mode)) {
1108 /* If inode is directory, d_splice_alias() below will remove
1109 * 'realdn' from its origin parent. We need to ensure that
1110 * origin parent's readdir cache will not reference 'realdn'
1111 */
1112 realdn = d_find_any_alias(in);
1113 if (realdn) {
1114 struct ceph_dentry_info *di = ceph_dentry(realdn);
1115 spin_lock(&realdn->d_lock);
1116
1117 realdn->d_op->d_prune(realdn);
1118
1119 di->time = jiffies;
1120 di->lease_shared_gen = 0;
1121 di->offset = 0;
1122
1123 spin_unlock(&realdn->d_lock);
1124 dput(realdn);
1125 }
1126 }
1127
1128 /* dn must be unhashed */
1129 if (!d_unhashed(dn))
1130 d_drop(dn);
1131 realdn = d_splice_alias(in, dn);
1132 if (IS_ERR(realdn)) {
1133 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
1134 PTR_ERR(realdn), dn, in, ceph_vinop(in));
1135 dn = realdn;
1136 /*
1137 * Caller should release 'dn' in the case of error.
1138 * If 'req->r_dentry' is passed to this function,
1139 * caller should leave 'req->r_dentry' untouched.
1140 */
1141 goto out;
1142 } else if (realdn) {
1143 dout("dn %p (%d) spliced with %p (%d) "
1144 "inode %p ino %llx.%llx\n",
1145 dn, d_count(dn),
1146 realdn, d_count(realdn),
1147 d_inode(realdn), ceph_vinop(d_inode(realdn)));
1148 dput(dn);
1149 dn = realdn;
1150 } else {
1151 BUG_ON(!ceph_dentry(dn));
1152 dout("dn %p attached to %p ino %llx.%llx\n",
1153 dn, d_inode(dn), ceph_vinop(d_inode(dn)));
1154 }
1155 out:
1156 return dn;
1157 }
1158
1159 /*
1160 * Incorporate results into the local cache. This is either just
1161 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1162 * after a lookup).
1163 *
1164 * A reply may contain
1165 * a directory inode along with a dentry.
1166 * and/or a target inode
1167 *
1168 * Called with snap_rwsem (read).
1169 */
1170 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
1171 {
1172 struct ceph_mds_session *session = req->r_session;
1173 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1174 struct inode *in = NULL;
1175 struct ceph_vino tvino, dvino;
1176 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1177 int err = 0;
1178
1179 dout("fill_trace %p is_dentry %d is_target %d\n", req,
1180 rinfo->head->is_dentry, rinfo->head->is_target);
1181
1182 if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1183 dout("fill_trace reply is empty!\n");
1184 if (rinfo->head->result == 0 && req->r_parent)
1185 ceph_invalidate_dir_request(req);
1186 return 0;
1187 }
1188
1189 if (rinfo->head->is_dentry) {
1190 struct inode *dir = req->r_parent;
1191
1192 if (dir) {
1193 err = fill_inode(dir, NULL,
1194 &rinfo->diri, rinfo->dirfrag,
1195 session, req->r_request_started, -1,
1196 &req->r_caps_reservation);
1197 if (err < 0)
1198 goto done;
1199 } else {
1200 WARN_ON_ONCE(1);
1201 }
1202
1203 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME &&
1204 test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1205 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1206 struct qstr dname;
1207 struct dentry *dn, *parent;
1208
1209 BUG_ON(!rinfo->head->is_target);
1210 BUG_ON(req->r_dentry);
1211
1212 parent = d_find_any_alias(dir);
1213 BUG_ON(!parent);
1214
1215 dname.name = rinfo->dname;
1216 dname.len = rinfo->dname_len;
1217 dname.hash = full_name_hash(parent, dname.name, dname.len);
1218 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1219 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1220 retry_lookup:
1221 dn = d_lookup(parent, &dname);
1222 dout("d_lookup on parent=%p name=%.*s got %p\n",
1223 parent, dname.len, dname.name, dn);
1224
1225 if (!dn) {
1226 dn = d_alloc(parent, &dname);
1227 dout("d_alloc %p '%.*s' = %p\n", parent,
1228 dname.len, dname.name, dn);
1229 if (!dn) {
1230 dput(parent);
1231 err = -ENOMEM;
1232 goto done;
1233 }
1234 err = 0;
1235 } else if (d_really_is_positive(dn) &&
1236 (ceph_ino(d_inode(dn)) != tvino.ino ||
1237 ceph_snap(d_inode(dn)) != tvino.snap)) {
1238 dout(" dn %p points to wrong inode %p\n",
1239 dn, d_inode(dn));
1240 ceph_dir_clear_ordered(dir);
1241 d_delete(dn);
1242 dput(dn);
1243 goto retry_lookup;
1244 }
1245
1246 req->r_dentry = dn;
1247 dput(parent);
1248 }
1249 }
1250
1251 if (rinfo->head->is_target) {
1252 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1253 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1254
1255 in = ceph_get_inode(sb, tvino);
1256 if (IS_ERR(in)) {
1257 err = PTR_ERR(in);
1258 goto done;
1259 }
1260 req->r_target_inode = in;
1261
1262 err = fill_inode(in, req->r_locked_page, &rinfo->targeti, NULL,
1263 session, req->r_request_started,
1264 (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1265 rinfo->head->result == 0) ? req->r_fmode : -1,
1266 &req->r_caps_reservation);
1267 if (err < 0) {
1268 pr_err("fill_inode badness %p %llx.%llx\n",
1269 in, ceph_vinop(in));
1270 goto done;
1271 }
1272 }
1273
1274 /*
1275 * ignore null lease/binding on snapdir ENOENT, or else we
1276 * will have trouble splicing in the virtual snapdir later
1277 */
1278 if (rinfo->head->is_dentry &&
1279 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1280 test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1281 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1282 fsc->mount_options->snapdir_name,
1283 req->r_dentry->d_name.len))) {
1284 /*
1285 * lookup link rename : null -> possibly existing inode
1286 * mknod symlink mkdir : null -> new inode
1287 * unlink : linked -> null
1288 */
1289 struct inode *dir = req->r_parent;
1290 struct dentry *dn = req->r_dentry;
1291 bool have_dir_cap, have_lease;
1292
1293 BUG_ON(!dn);
1294 BUG_ON(!dir);
1295 BUG_ON(d_inode(dn->d_parent) != dir);
1296
1297 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1298 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1299
1300 BUG_ON(ceph_ino(dir) != dvino.ino);
1301 BUG_ON(ceph_snap(dir) != dvino.snap);
1302
1303 /* do we have a lease on the whole dir? */
1304 have_dir_cap =
1305 (le32_to_cpu(rinfo->diri.in->cap.caps) &
1306 CEPH_CAP_FILE_SHARED);
1307
1308 /* do we have a dn lease? */
1309 have_lease = have_dir_cap ||
1310 le32_to_cpu(rinfo->dlease->duration_ms);
1311 if (!have_lease)
1312 dout("fill_trace no dentry lease or dir cap\n");
1313
1314 /* rename? */
1315 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1316 struct inode *olddir = req->r_old_dentry_dir;
1317 BUG_ON(!olddir);
1318
1319 dout(" src %p '%pd' dst %p '%pd'\n",
1320 req->r_old_dentry,
1321 req->r_old_dentry,
1322 dn, dn);
1323 dout("fill_trace doing d_move %p -> %p\n",
1324 req->r_old_dentry, dn);
1325
1326 /* d_move screws up sibling dentries' offsets */
1327 ceph_dir_clear_ordered(dir);
1328 ceph_dir_clear_ordered(olddir);
1329
1330 d_move(req->r_old_dentry, dn);
1331 dout(" src %p '%pd' dst %p '%pd'\n",
1332 req->r_old_dentry,
1333 req->r_old_dentry,
1334 dn, dn);
1335
1336 /* ensure target dentry is invalidated, despite
1337 rehashing bug in vfs_rename_dir */
1338 ceph_invalidate_dentry_lease(dn);
1339
1340 dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1341 ceph_dentry(req->r_old_dentry)->offset);
1342
1343 dn = req->r_old_dentry; /* use old_dentry */
1344 }
1345
1346 /* null dentry? */
1347 if (!rinfo->head->is_target) {
1348 dout("fill_trace null dentry\n");
1349 if (d_really_is_positive(dn)) {
1350 dout("d_delete %p\n", dn);
1351 ceph_dir_clear_ordered(dir);
1352 d_delete(dn);
1353 } else if (have_lease) {
1354 if (d_unhashed(dn))
1355 d_add(dn, NULL);
1356 update_dentry_lease(dn, rinfo->dlease,
1357 session,
1358 req->r_request_started,
1359 NULL, &dvino);
1360 }
1361 goto done;
1362 }
1363
1364 /* attach proper inode */
1365 if (d_really_is_negative(dn)) {
1366 ceph_dir_clear_ordered(dir);
1367 ihold(in);
1368 dn = splice_dentry(dn, in);
1369 if (IS_ERR(dn)) {
1370 err = PTR_ERR(dn);
1371 goto done;
1372 }
1373 req->r_dentry = dn; /* may have spliced */
1374 } else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1375 dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1376 dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1377 ceph_vinop(in));
1378 d_invalidate(dn);
1379 have_lease = false;
1380 }
1381
1382 if (have_lease) {
1383 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1384 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1385 update_dentry_lease(dn, rinfo->dlease, session,
1386 req->r_request_started,
1387 &tvino, &dvino);
1388 }
1389 dout(" final dn %p\n", dn);
1390 } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1391 req->r_op == CEPH_MDS_OP_MKSNAP) &&
1392 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1393 struct dentry *dn = req->r_dentry;
1394 struct inode *dir = req->r_parent;
1395
1396 /* fill out a snapdir LOOKUPSNAP dentry */
1397 BUG_ON(!dn);
1398 BUG_ON(!dir);
1399 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1400 dout(" linking snapped dir %p to dn %p\n", in, dn);
1401 ceph_dir_clear_ordered(dir);
1402 ihold(in);
1403 dn = splice_dentry(dn, in);
1404 if (IS_ERR(dn)) {
1405 err = PTR_ERR(dn);
1406 goto done;
1407 }
1408 req->r_dentry = dn; /* may have spliced */
1409 } else if (rinfo->head->is_dentry) {
1410 struct ceph_vino *ptvino = NULL;
1411
1412 if ((le32_to_cpu(rinfo->diri.in->cap.caps) & CEPH_CAP_FILE_SHARED) ||
1413 le32_to_cpu(rinfo->dlease->duration_ms)) {
1414 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1415 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1416
1417 if (rinfo->head->is_target) {
1418 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1419 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1420 ptvino = &tvino;
1421 }
1422
1423 update_dentry_lease(req->r_dentry, rinfo->dlease,
1424 session, req->r_request_started, ptvino,
1425 &dvino);
1426 } else {
1427 dout("%s: no dentry lease or dir cap\n", __func__);
1428 }
1429 }
1430 done:
1431 dout("fill_trace done err=%d\n", err);
1432 return err;
1433 }
1434
1435 /*
1436 * Prepopulate our cache with readdir results, leases, etc.
1437 */
1438 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1439 struct ceph_mds_session *session)
1440 {
1441 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1442 int i, err = 0;
1443
1444 for (i = 0; i < rinfo->dir_nr; i++) {
1445 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1446 struct ceph_vino vino;
1447 struct inode *in;
1448 int rc;
1449
1450 vino.ino = le64_to_cpu(rde->inode.in->ino);
1451 vino.snap = le64_to_cpu(rde->inode.in->snapid);
1452
1453 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1454 if (IS_ERR(in)) {
1455 err = PTR_ERR(in);
1456 dout("new_inode badness got %d\n", err);
1457 continue;
1458 }
1459 rc = fill_inode(in, NULL, &rde->inode, NULL, session,
1460 req->r_request_started, -1,
1461 &req->r_caps_reservation);
1462 if (rc < 0) {
1463 pr_err("fill_inode badness on %p got %d\n", in, rc);
1464 err = rc;
1465 }
1466 iput(in);
1467 }
1468
1469 return err;
1470 }
1471
1472 void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1473 {
1474 if (ctl->page) {
1475 kunmap(ctl->page);
1476 put_page(ctl->page);
1477 ctl->page = NULL;
1478 }
1479 }
1480
1481 static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1482 struct ceph_readdir_cache_control *ctl,
1483 struct ceph_mds_request *req)
1484 {
1485 struct ceph_inode_info *ci = ceph_inode(dir);
1486 unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
1487 unsigned idx = ctl->index % nsize;
1488 pgoff_t pgoff = ctl->index / nsize;
1489
1490 if (!ctl->page || pgoff != page_index(ctl->page)) {
1491 ceph_readdir_cache_release(ctl);
1492 if (idx == 0)
1493 ctl->page = grab_cache_page(&dir->i_data, pgoff);
1494 else
1495 ctl->page = find_lock_page(&dir->i_data, pgoff);
1496 if (!ctl->page) {
1497 ctl->index = -1;
1498 return idx == 0 ? -ENOMEM : 0;
1499 }
1500 /* reading/filling the cache are serialized by
1501 * i_mutex, no need to use page lock */
1502 unlock_page(ctl->page);
1503 ctl->dentries = kmap(ctl->page);
1504 if (idx == 0)
1505 memset(ctl->dentries, 0, PAGE_SIZE);
1506 }
1507
1508 if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1509 req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1510 dout("readdir cache dn %p idx %d\n", dn, ctl->index);
1511 ctl->dentries[idx] = dn;
1512 ctl->index++;
1513 } else {
1514 dout("disable readdir cache\n");
1515 ctl->index = -1;
1516 }
1517 return 0;
1518 }
1519
1520 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1521 struct ceph_mds_session *session)
1522 {
1523 struct dentry *parent = req->r_dentry;
1524 struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
1525 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1526 struct qstr dname;
1527 struct dentry *dn;
1528 struct inode *in;
1529 int err = 0, skipped = 0, ret, i;
1530 struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1531 u32 frag = le32_to_cpu(rhead->args.readdir.frag);
1532 u32 last_hash = 0;
1533 u32 fpos_offset;
1534 struct ceph_readdir_cache_control cache_ctl = {};
1535
1536 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
1537 return readdir_prepopulate_inodes_only(req, session);
1538
1539 if (rinfo->hash_order) {
1540 if (req->r_path2) {
1541 last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1542 req->r_path2,
1543 strlen(req->r_path2));
1544 last_hash = ceph_frag_value(last_hash);
1545 } else if (rinfo->offset_hash) {
1546 /* mds understands offset_hash */
1547 WARN_ON_ONCE(req->r_readdir_offset != 2);
1548 last_hash = le32_to_cpu(rhead->args.readdir.offset_hash);
1549 }
1550 }
1551
1552 if (rinfo->dir_dir &&
1553 le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1554 dout("readdir_prepopulate got new frag %x -> %x\n",
1555 frag, le32_to_cpu(rinfo->dir_dir->frag));
1556 frag = le32_to_cpu(rinfo->dir_dir->frag);
1557 if (!rinfo->hash_order)
1558 req->r_readdir_offset = 2;
1559 }
1560
1561 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1562 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1563 rinfo->dir_nr, parent);
1564 } else {
1565 dout("readdir_prepopulate %d items under dn %p\n",
1566 rinfo->dir_nr, parent);
1567 if (rinfo->dir_dir)
1568 ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1569
1570 if (ceph_frag_is_leftmost(frag) &&
1571 req->r_readdir_offset == 2 &&
1572 !(rinfo->hash_order && last_hash)) {
1573 /* note dir version at start of readdir so we can
1574 * tell if any dentries get dropped */
1575 req->r_dir_release_cnt =
1576 atomic64_read(&ci->i_release_count);
1577 req->r_dir_ordered_cnt =
1578 atomic64_read(&ci->i_ordered_count);
1579 req->r_readdir_cache_idx = 0;
1580 }
1581 }
1582
1583 cache_ctl.index = req->r_readdir_cache_idx;
1584 fpos_offset = req->r_readdir_offset;
1585
1586 /* FIXME: release caps/leases if error occurs */
1587 for (i = 0; i < rinfo->dir_nr; i++) {
1588 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1589 struct ceph_vino tvino, dvino;
1590
1591 dname.name = rde->name;
1592 dname.len = rde->name_len;
1593 dname.hash = full_name_hash(parent, dname.name, dname.len);
1594
1595 tvino.ino = le64_to_cpu(rde->inode.in->ino);
1596 tvino.snap = le64_to_cpu(rde->inode.in->snapid);
1597
1598 if (rinfo->hash_order) {
1599 u32 hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1600 rde->name, rde->name_len);
1601 hash = ceph_frag_value(hash);
1602 if (hash != last_hash)
1603 fpos_offset = 2;
1604 last_hash = hash;
1605 rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
1606 } else {
1607 rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
1608 }
1609
1610 retry_lookup:
1611 dn = d_lookup(parent, &dname);
1612 dout("d_lookup on parent=%p name=%.*s got %p\n",
1613 parent, dname.len, dname.name, dn);
1614
1615 if (!dn) {
1616 dn = d_alloc(parent, &dname);
1617 dout("d_alloc %p '%.*s' = %p\n", parent,
1618 dname.len, dname.name, dn);
1619 if (!dn) {
1620 dout("d_alloc badness\n");
1621 err = -ENOMEM;
1622 goto out;
1623 }
1624 } else if (d_really_is_positive(dn) &&
1625 (ceph_ino(d_inode(dn)) != tvino.ino ||
1626 ceph_snap(d_inode(dn)) != tvino.snap)) {
1627 struct ceph_dentry_info *di = ceph_dentry(dn);
1628 dout(" dn %p points to wrong inode %p\n",
1629 dn, d_inode(dn));
1630
1631 spin_lock(&dn->d_lock);
1632 if (di->offset > 0 &&
1633 di->lease_shared_gen ==
1634 atomic_read(&ci->i_shared_gen)) {
1635 __ceph_dir_clear_ordered(ci);
1636 di->offset = 0;
1637 }
1638 spin_unlock(&dn->d_lock);
1639
1640 d_delete(dn);
1641 dput(dn);
1642 goto retry_lookup;
1643 }
1644
1645 /* inode */
1646 if (d_really_is_positive(dn)) {
1647 in = d_inode(dn);
1648 } else {
1649 in = ceph_get_inode(parent->d_sb, tvino);
1650 if (IS_ERR(in)) {
1651 dout("new_inode badness\n");
1652 d_drop(dn);
1653 dput(dn);
1654 err = PTR_ERR(in);
1655 goto out;
1656 }
1657 }
1658
1659 ret = fill_inode(in, NULL, &rde->inode, NULL, session,
1660 req->r_request_started, -1,
1661 &req->r_caps_reservation);
1662 if (ret < 0) {
1663 pr_err("fill_inode badness on %p\n", in);
1664 if (d_really_is_negative(dn))
1665 iput(in);
1666 d_drop(dn);
1667 err = ret;
1668 goto next_item;
1669 }
1670
1671 if (d_really_is_negative(dn)) {
1672 struct dentry *realdn;
1673
1674 if (ceph_security_xattr_deadlock(in)) {
1675 dout(" skip splicing dn %p to inode %p"
1676 " (security xattr deadlock)\n", dn, in);
1677 iput(in);
1678 skipped++;
1679 goto next_item;
1680 }
1681
1682 realdn = splice_dentry(dn, in);
1683 if (IS_ERR(realdn)) {
1684 err = PTR_ERR(realdn);
1685 d_drop(dn);
1686 goto next_item;
1687 }
1688 dn = realdn;
1689 }
1690
1691 ceph_dentry(dn)->offset = rde->offset;
1692
1693 dvino = ceph_vino(d_inode(parent));
1694 update_dentry_lease(dn, rde->lease, req->r_session,
1695 req->r_request_started, &tvino, &dvino);
1696
1697 if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
1698 ret = fill_readdir_cache(d_inode(parent), dn,
1699 &cache_ctl, req);
1700 if (ret < 0)
1701 err = ret;
1702 }
1703 next_item:
1704 if (dn)
1705 dput(dn);
1706 }
1707 out:
1708 if (err == 0 && skipped == 0) {
1709 set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
1710 req->r_readdir_cache_idx = cache_ctl.index;
1711 }
1712 ceph_readdir_cache_release(&cache_ctl);
1713 dout("readdir_prepopulate done\n");
1714 return err;
1715 }
1716
1717 bool ceph_inode_set_size(struct inode *inode, loff_t size)
1718 {
1719 struct ceph_inode_info *ci = ceph_inode(inode);
1720 bool ret;
1721
1722 spin_lock(&ci->i_ceph_lock);
1723 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1724 i_size_write(inode, size);
1725 inode->i_blocks = calc_inode_blocks(size);
1726
1727 ret = __ceph_should_report_size(ci);
1728
1729 spin_unlock(&ci->i_ceph_lock);
1730 return ret;
1731 }
1732
1733 /*
1734 * Write back inode data in a worker thread. (This can't be done
1735 * in the message handler context.)
1736 */
1737 void ceph_queue_writeback(struct inode *inode)
1738 {
1739 ihold(inode);
1740 if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1741 &ceph_inode(inode)->i_wb_work)) {
1742 dout("ceph_queue_writeback %p\n", inode);
1743 } else {
1744 dout("ceph_queue_writeback %p failed\n", inode);
1745 iput(inode);
1746 }
1747 }
1748
1749 static void ceph_writeback_work(struct work_struct *work)
1750 {
1751 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1752 i_wb_work);
1753 struct inode *inode = &ci->vfs_inode;
1754
1755 dout("writeback %p\n", inode);
1756 filemap_fdatawrite(&inode->i_data);
1757 iput(inode);
1758 }
1759
1760 /*
1761 * queue an async invalidation
1762 */
1763 void ceph_queue_invalidate(struct inode *inode)
1764 {
1765 ihold(inode);
1766 if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1767 &ceph_inode(inode)->i_pg_inv_work)) {
1768 dout("ceph_queue_invalidate %p\n", inode);
1769 } else {
1770 dout("ceph_queue_invalidate %p failed\n", inode);
1771 iput(inode);
1772 }
1773 }
1774
1775 /*
1776 * Invalidate inode pages in a worker thread. (This can't be done
1777 * in the message handler context.)
1778 */
1779 static void ceph_invalidate_work(struct work_struct *work)
1780 {
1781 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1782 i_pg_inv_work);
1783 struct inode *inode = &ci->vfs_inode;
1784 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1785 u32 orig_gen;
1786 int check = 0;
1787
1788 mutex_lock(&ci->i_truncate_mutex);
1789
1790 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
1791 pr_warn_ratelimited("invalidate_pages %p %lld forced umount\n",
1792 inode, ceph_ino(inode));
1793 mapping_set_error(inode->i_mapping, -EIO);
1794 truncate_pagecache(inode, 0);
1795 mutex_unlock(&ci->i_truncate_mutex);
1796 goto out;
1797 }
1798
1799 spin_lock(&ci->i_ceph_lock);
1800 dout("invalidate_pages %p gen %d revoking %d\n", inode,
1801 ci->i_rdcache_gen, ci->i_rdcache_revoking);
1802 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1803 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1804 check = 1;
1805 spin_unlock(&ci->i_ceph_lock);
1806 mutex_unlock(&ci->i_truncate_mutex);
1807 goto out;
1808 }
1809 orig_gen = ci->i_rdcache_gen;
1810 spin_unlock(&ci->i_ceph_lock);
1811
1812 if (invalidate_inode_pages2(inode->i_mapping) < 0) {
1813 pr_err("invalidate_pages %p fails\n", inode);
1814 }
1815
1816 spin_lock(&ci->i_ceph_lock);
1817 if (orig_gen == ci->i_rdcache_gen &&
1818 orig_gen == ci->i_rdcache_revoking) {
1819 dout("invalidate_pages %p gen %d successful\n", inode,
1820 ci->i_rdcache_gen);
1821 ci->i_rdcache_revoking--;
1822 check = 1;
1823 } else {
1824 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1825 inode, orig_gen, ci->i_rdcache_gen,
1826 ci->i_rdcache_revoking);
1827 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1828 check = 1;
1829 }
1830 spin_unlock(&ci->i_ceph_lock);
1831 mutex_unlock(&ci->i_truncate_mutex);
1832 out:
1833 if (check)
1834 ceph_check_caps(ci, 0, NULL);
1835 iput(inode);
1836 }
1837
1838
1839 /*
1840 * called by trunc_wq;
1841 *
1842 * We also truncate in a separate thread as well.
1843 */
1844 static void ceph_vmtruncate_work(struct work_struct *work)
1845 {
1846 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1847 i_vmtruncate_work);
1848 struct inode *inode = &ci->vfs_inode;
1849
1850 dout("vmtruncate_work %p\n", inode);
1851 __ceph_do_pending_vmtruncate(inode);
1852 iput(inode);
1853 }
1854
1855 /*
1856 * Queue an async vmtruncate. If we fail to queue work, we will handle
1857 * the truncation the next time we call __ceph_do_pending_vmtruncate.
1858 */
1859 void ceph_queue_vmtruncate(struct inode *inode)
1860 {
1861 struct ceph_inode_info *ci = ceph_inode(inode);
1862
1863 ihold(inode);
1864
1865 if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1866 &ci->i_vmtruncate_work)) {
1867 dout("ceph_queue_vmtruncate %p\n", inode);
1868 } else {
1869 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1870 inode, ci->i_truncate_pending);
1871 iput(inode);
1872 }
1873 }
1874
1875 /*
1876 * Make sure any pending truncation is applied before doing anything
1877 * that may depend on it.
1878 */
1879 void __ceph_do_pending_vmtruncate(struct inode *inode)
1880 {
1881 struct ceph_inode_info *ci = ceph_inode(inode);
1882 u64 to;
1883 int wrbuffer_refs, finish = 0;
1884
1885 mutex_lock(&ci->i_truncate_mutex);
1886 retry:
1887 spin_lock(&ci->i_ceph_lock);
1888 if (ci->i_truncate_pending == 0) {
1889 dout("__do_pending_vmtruncate %p none pending\n", inode);
1890 spin_unlock(&ci->i_ceph_lock);
1891 mutex_unlock(&ci->i_truncate_mutex);
1892 return;
1893 }
1894
1895 /*
1896 * make sure any dirty snapped pages are flushed before we
1897 * possibly truncate them.. so write AND block!
1898 */
1899 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1900 spin_unlock(&ci->i_ceph_lock);
1901 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1902 inode);
1903 filemap_write_and_wait_range(&inode->i_data, 0,
1904 inode->i_sb->s_maxbytes);
1905 goto retry;
1906 }
1907
1908 /* there should be no reader or writer */
1909 WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1910
1911 to = ci->i_truncate_size;
1912 wrbuffer_refs = ci->i_wrbuffer_ref;
1913 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1914 ci->i_truncate_pending, to);
1915 spin_unlock(&ci->i_ceph_lock);
1916
1917 truncate_pagecache(inode, to);
1918
1919 spin_lock(&ci->i_ceph_lock);
1920 if (to == ci->i_truncate_size) {
1921 ci->i_truncate_pending = 0;
1922 finish = 1;
1923 }
1924 spin_unlock(&ci->i_ceph_lock);
1925 if (!finish)
1926 goto retry;
1927
1928 mutex_unlock(&ci->i_truncate_mutex);
1929
1930 if (wrbuffer_refs == 0)
1931 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1932
1933 wake_up_all(&ci->i_cap_wq);
1934 }
1935
1936 /*
1937 * symlinks
1938 */
1939 static const struct inode_operations ceph_symlink_iops = {
1940 .get_link = simple_get_link,
1941 .setattr = ceph_setattr,
1942 .getattr = ceph_getattr,
1943 .listxattr = ceph_listxattr,
1944 };
1945
1946 int __ceph_setattr(struct inode *inode, struct iattr *attr)
1947 {
1948 struct ceph_inode_info *ci = ceph_inode(inode);
1949 const unsigned int ia_valid = attr->ia_valid;
1950 struct ceph_mds_request *req;
1951 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1952 struct ceph_cap_flush *prealloc_cf;
1953 int issued;
1954 int release = 0, dirtied = 0;
1955 int mask = 0;
1956 int err = 0;
1957 int inode_dirty_flags = 0;
1958 bool lock_snap_rwsem = false;
1959
1960 prealloc_cf = ceph_alloc_cap_flush();
1961 if (!prealloc_cf)
1962 return -ENOMEM;
1963
1964 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1965 USE_AUTH_MDS);
1966 if (IS_ERR(req)) {
1967 ceph_free_cap_flush(prealloc_cf);
1968 return PTR_ERR(req);
1969 }
1970
1971 spin_lock(&ci->i_ceph_lock);
1972 issued = __ceph_caps_issued(ci, NULL);
1973
1974 if (!ci->i_head_snapc &&
1975 (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
1976 lock_snap_rwsem = true;
1977 if (!down_read_trylock(&mdsc->snap_rwsem)) {
1978 spin_unlock(&ci->i_ceph_lock);
1979 down_read(&mdsc->snap_rwsem);
1980 spin_lock(&ci->i_ceph_lock);
1981 issued = __ceph_caps_issued(ci, NULL);
1982 }
1983 }
1984
1985 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1986
1987 if (ia_valid & ATTR_UID) {
1988 dout("setattr %p uid %d -> %d\n", inode,
1989 from_kuid(&init_user_ns, inode->i_uid),
1990 from_kuid(&init_user_ns, attr->ia_uid));
1991 if (issued & CEPH_CAP_AUTH_EXCL) {
1992 inode->i_uid = attr->ia_uid;
1993 dirtied |= CEPH_CAP_AUTH_EXCL;
1994 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1995 !uid_eq(attr->ia_uid, inode->i_uid)) {
1996 req->r_args.setattr.uid = cpu_to_le32(
1997 from_kuid(&init_user_ns, attr->ia_uid));
1998 mask |= CEPH_SETATTR_UID;
1999 release |= CEPH_CAP_AUTH_SHARED;
2000 }
2001 }
2002 if (ia_valid & ATTR_GID) {
2003 dout("setattr %p gid %d -> %d\n", inode,
2004 from_kgid(&init_user_ns, inode->i_gid),
2005 from_kgid(&init_user_ns, attr->ia_gid));
2006 if (issued & CEPH_CAP_AUTH_EXCL) {
2007 inode->i_gid = attr->ia_gid;
2008 dirtied |= CEPH_CAP_AUTH_EXCL;
2009 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2010 !gid_eq(attr->ia_gid, inode->i_gid)) {
2011 req->r_args.setattr.gid = cpu_to_le32(
2012 from_kgid(&init_user_ns, attr->ia_gid));
2013 mask |= CEPH_SETATTR_GID;
2014 release |= CEPH_CAP_AUTH_SHARED;
2015 }
2016 }
2017 if (ia_valid & ATTR_MODE) {
2018 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
2019 attr->ia_mode);
2020 if (issued & CEPH_CAP_AUTH_EXCL) {
2021 inode->i_mode = attr->ia_mode;
2022 dirtied |= CEPH_CAP_AUTH_EXCL;
2023 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2024 attr->ia_mode != inode->i_mode) {
2025 inode->i_mode = attr->ia_mode;
2026 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
2027 mask |= CEPH_SETATTR_MODE;
2028 release |= CEPH_CAP_AUTH_SHARED;
2029 }
2030 }
2031
2032 if (ia_valid & ATTR_ATIME) {
2033 dout("setattr %p atime %lld.%ld -> %lld.%ld\n", inode,
2034 inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
2035 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
2036 if (issued & CEPH_CAP_FILE_EXCL) {
2037 ci->i_time_warp_seq++;
2038 inode->i_atime = attr->ia_atime;
2039 dirtied |= CEPH_CAP_FILE_EXCL;
2040 } else if ((issued & CEPH_CAP_FILE_WR) &&
2041 timespec64_compare(&inode->i_atime,
2042 &attr->ia_atime) < 0) {
2043 inode->i_atime = attr->ia_atime;
2044 dirtied |= CEPH_CAP_FILE_WR;
2045 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2046 !timespec64_equal(&inode->i_atime, &attr->ia_atime)) {
2047 ceph_encode_timespec64(&req->r_args.setattr.atime,
2048 &attr->ia_atime);
2049 mask |= CEPH_SETATTR_ATIME;
2050 release |= CEPH_CAP_FILE_SHARED |
2051 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2052 }
2053 }
2054 if (ia_valid & ATTR_MTIME) {
2055 dout("setattr %p mtime %lld.%ld -> %lld.%ld\n", inode,
2056 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
2057 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
2058 if (issued & CEPH_CAP_FILE_EXCL) {
2059 ci->i_time_warp_seq++;
2060 inode->i_mtime = attr->ia_mtime;
2061 dirtied |= CEPH_CAP_FILE_EXCL;
2062 } else if ((issued & CEPH_CAP_FILE_WR) &&
2063 timespec64_compare(&inode->i_mtime,
2064 &attr->ia_mtime) < 0) {
2065 inode->i_mtime = attr->ia_mtime;
2066 dirtied |= CEPH_CAP_FILE_WR;
2067 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2068 !timespec64_equal(&inode->i_mtime, &attr->ia_mtime)) {
2069 ceph_encode_timespec64(&req->r_args.setattr.mtime,
2070 &attr->ia_mtime);
2071 mask |= CEPH_SETATTR_MTIME;
2072 release |= CEPH_CAP_FILE_SHARED |
2073 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2074 }
2075 }
2076 if (ia_valid & ATTR_SIZE) {
2077 dout("setattr %p size %lld -> %lld\n", inode,
2078 inode->i_size, attr->ia_size);
2079 if ((issued & CEPH_CAP_FILE_EXCL) &&
2080 attr->ia_size > inode->i_size) {
2081 i_size_write(inode, attr->ia_size);
2082 inode->i_blocks = calc_inode_blocks(attr->ia_size);
2083 ci->i_reported_size = attr->ia_size;
2084 dirtied |= CEPH_CAP_FILE_EXCL;
2085 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2086 attr->ia_size != inode->i_size) {
2087 req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
2088 req->r_args.setattr.old_size =
2089 cpu_to_le64(inode->i_size);
2090 mask |= CEPH_SETATTR_SIZE;
2091 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2092 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2093 }
2094 }
2095
2096 /* these do nothing */
2097 if (ia_valid & ATTR_CTIME) {
2098 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
2099 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
2100 dout("setattr %p ctime %lld.%ld -> %lld.%ld (%s)\n", inode,
2101 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
2102 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
2103 only ? "ctime only" : "ignored");
2104 if (only) {
2105 /*
2106 * if kernel wants to dirty ctime but nothing else,
2107 * we need to choose a cap to dirty under, or do
2108 * a almost-no-op setattr
2109 */
2110 if (issued & CEPH_CAP_AUTH_EXCL)
2111 dirtied |= CEPH_CAP_AUTH_EXCL;
2112 else if (issued & CEPH_CAP_FILE_EXCL)
2113 dirtied |= CEPH_CAP_FILE_EXCL;
2114 else if (issued & CEPH_CAP_XATTR_EXCL)
2115 dirtied |= CEPH_CAP_XATTR_EXCL;
2116 else
2117 mask |= CEPH_SETATTR_CTIME;
2118 }
2119 }
2120 if (ia_valid & ATTR_FILE)
2121 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
2122
2123 if (dirtied) {
2124 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
2125 &prealloc_cf);
2126 inode->i_ctime = attr->ia_ctime;
2127 }
2128
2129 release &= issued;
2130 spin_unlock(&ci->i_ceph_lock);
2131 if (lock_snap_rwsem)
2132 up_read(&mdsc->snap_rwsem);
2133
2134 if (inode_dirty_flags)
2135 __mark_inode_dirty(inode, inode_dirty_flags);
2136
2137
2138 if (mask) {
2139 req->r_inode = inode;
2140 ihold(inode);
2141 req->r_inode_drop = release;
2142 req->r_args.setattr.mask = cpu_to_le32(mask);
2143 req->r_num_caps = 1;
2144 req->r_stamp = attr->ia_ctime;
2145 err = ceph_mdsc_do_request(mdsc, NULL, req);
2146 }
2147 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
2148 ceph_cap_string(dirtied), mask);
2149
2150 ceph_mdsc_put_request(req);
2151 ceph_free_cap_flush(prealloc_cf);
2152
2153 if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
2154 __ceph_do_pending_vmtruncate(inode);
2155
2156 return err;
2157 }
2158
2159 /*
2160 * setattr
2161 */
2162 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
2163 {
2164 struct inode *inode = d_inode(dentry);
2165 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
2166 int err;
2167
2168 if (ceph_snap(inode) != CEPH_NOSNAP)
2169 return -EROFS;
2170
2171 err = setattr_prepare(dentry, attr);
2172 if (err != 0)
2173 return err;
2174
2175 if ((attr->ia_valid & ATTR_SIZE) &&
2176 attr->ia_size > max(inode->i_size, fsc->max_file_size))
2177 return -EFBIG;
2178
2179 if ((attr->ia_valid & ATTR_SIZE) &&
2180 ceph_quota_is_max_bytes_exceeded(inode, attr->ia_size))
2181 return -EDQUOT;
2182
2183 err = __ceph_setattr(inode, attr);
2184
2185 if (err >= 0 && (attr->ia_valid & ATTR_MODE))
2186 err = posix_acl_chmod(inode, attr->ia_mode);
2187
2188 return err;
2189 }
2190
2191 /*
2192 * Verify that we have a lease on the given mask. If not,
2193 * do a getattr against an mds.
2194 */
2195 int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2196 int mask, bool force)
2197 {
2198 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2199 struct ceph_mds_client *mdsc = fsc->mdsc;
2200 struct ceph_mds_request *req;
2201 int mode;
2202 int err;
2203
2204 if (ceph_snap(inode) == CEPH_SNAPDIR) {
2205 dout("do_getattr inode %p SNAPDIR\n", inode);
2206 return 0;
2207 }
2208
2209 dout("do_getattr inode %p mask %s mode 0%o\n",
2210 inode, ceph_cap_string(mask), inode->i_mode);
2211 if (!force && ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
2212 return 0;
2213
2214 mode = (mask & CEPH_STAT_RSTAT) ? USE_AUTH_MDS : USE_ANY_MDS;
2215 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
2216 if (IS_ERR(req))
2217 return PTR_ERR(req);
2218 req->r_inode = inode;
2219 ihold(inode);
2220 req->r_num_caps = 1;
2221 req->r_args.getattr.mask = cpu_to_le32(mask);
2222 req->r_locked_page = locked_page;
2223 err = ceph_mdsc_do_request(mdsc, NULL, req);
2224 if (locked_page && err == 0) {
2225 u64 inline_version = req->r_reply_info.targeti.inline_version;
2226 if (inline_version == 0) {
2227 /* the reply is supposed to contain inline data */
2228 err = -EINVAL;
2229 } else if (inline_version == CEPH_INLINE_NONE) {
2230 err = -ENODATA;
2231 } else {
2232 err = req->r_reply_info.targeti.inline_len;
2233 }
2234 }
2235 ceph_mdsc_put_request(req);
2236 dout("do_getattr result=%d\n", err);
2237 return err;
2238 }
2239
2240
2241 /*
2242 * Check inode permissions. We verify we have a valid value for
2243 * the AUTH cap, then call the generic handler.
2244 */
2245 int ceph_permission(struct inode *inode, int mask)
2246 {
2247 int err;
2248
2249 if (mask & MAY_NOT_BLOCK)
2250 return -ECHILD;
2251
2252 err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
2253
2254 if (!err)
2255 err = generic_permission(inode, mask);
2256 return err;
2257 }
2258
2259 /*
2260 * Get all attributes. Hopefully somedata we'll have a statlite()
2261 * and can limit the fields we require to be accurate.
2262 */
2263 int ceph_getattr(const struct path *path, struct kstat *stat,
2264 u32 request_mask, unsigned int flags)
2265 {
2266 struct inode *inode = d_inode(path->dentry);
2267 struct ceph_inode_info *ci = ceph_inode(inode);
2268 int err;
2269
2270 err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL, false);
2271 if (!err) {
2272 generic_fillattr(inode, stat);
2273 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
2274 if (ceph_snap(inode) != CEPH_NOSNAP)
2275 stat->dev = ceph_snap(inode);
2276 else
2277 stat->dev = 0;
2278 if (S_ISDIR(inode->i_mode)) {
2279 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
2280 RBYTES))
2281 stat->size = ci->i_rbytes;
2282 else
2283 stat->size = ci->i_files + ci->i_subdirs;
2284 stat->blocks = 0;
2285 stat->blksize = 65536;
2286 /*
2287 * Some applications rely on the number of st_nlink
2288 * value on directories to be either 0 (if unlinked)
2289 * or 2 + number of subdirectories.
2290 */
2291 if (stat->nlink == 1)
2292 /* '.' + '..' + subdirs */
2293 stat->nlink = 1 + 1 + ci->i_subdirs;
2294 }
2295 }
2296 return err;
2297 }
Linux with added FPC-III support