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[mirror_ubuntu-bionic-kernel.git] / fs / ceph / inode.c
1 #include <linux/ceph/ceph_debug.h>
2
3 #include <linux/module.h>
4 #include <linux/fs.h>
5 #include <linux/slab.h>
6 #include <linux/string.h>
7 #include <linux/uaccess.h>
8 #include <linux/kernel.h>
9 #include <linux/namei.h>
10 #include <linux/writeback.h>
11 #include <linux/vmalloc.h>
12 #include <linux/posix_acl.h>
13 #include <linux/random.h>
14
15 #include "super.h"
16 #include "mds_client.h"
17 #include "cache.h"
18 #include <linux/ceph/decode.h>
19
20 /*
21 * Ceph inode operations
22 *
23 * Implement basic inode helpers (get, alloc) and inode ops (getattr,
24 * setattr, etc.), xattr helpers, and helpers for assimilating
25 * metadata returned by the MDS into our cache.
26 *
27 * Also define helpers for doing asynchronous writeback, invalidation,
28 * and truncation for the benefit of those who can't afford to block
29 * (typically because they are in the message handler path).
30 */
31
32 static const struct inode_operations ceph_symlink_iops;
33
34 static void ceph_invalidate_work(struct work_struct *work);
35 static void ceph_writeback_work(struct work_struct *work);
36 static void ceph_vmtruncate_work(struct work_struct *work);
37
38 /*
39 * find or create an inode, given the ceph ino number
40 */
41 static int ceph_set_ino_cb(struct inode *inode, void *data)
42 {
43 ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
44 inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
45 return 0;
46 }
47
48 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
49 {
50 struct inode *inode;
51 ino_t t = ceph_vino_to_ino(vino);
52
53 inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
54 if (inode == NULL)
55 return ERR_PTR(-ENOMEM);
56 if (inode->i_state & I_NEW) {
57 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
58 inode, ceph_vinop(inode), (u64)inode->i_ino);
59 unlock_new_inode(inode);
60 }
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_dir_iops;
86 inode->i_fop = &ceph_dir_fops;
87 ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
88 ci->i_rbytes = 0;
89 return inode;
90 }
91
92 const struct inode_operations ceph_file_iops = {
93 .permission = ceph_permission,
94 .setattr = ceph_setattr,
95 .getattr = ceph_getattr,
96 .setxattr = ceph_setxattr,
97 .getxattr = ceph_getxattr,
98 .listxattr = ceph_listxattr,
99 .removexattr = ceph_removexattr,
100 .get_acl = ceph_get_acl,
101 .set_acl = ceph_set_acl,
102 };
103
104
105 /*
106 * We use a 'frag tree' to keep track of the MDS's directory fragments
107 * for a given inode (usually there is just a single fragment). We
108 * need to know when a child frag is delegated to a new MDS, or when
109 * it is flagged as replicated, so we can direct our requests
110 * accordingly.
111 */
112
113 /*
114 * find/create a frag in the tree
115 */
116 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
117 u32 f)
118 {
119 struct rb_node **p;
120 struct rb_node *parent = NULL;
121 struct ceph_inode_frag *frag;
122 int c;
123
124 p = &ci->i_fragtree.rb_node;
125 while (*p) {
126 parent = *p;
127 frag = rb_entry(parent, struct ceph_inode_frag, node);
128 c = ceph_frag_compare(f, frag->frag);
129 if (c < 0)
130 p = &(*p)->rb_left;
131 else if (c > 0)
132 p = &(*p)->rb_right;
133 else
134 return frag;
135 }
136
137 frag = kmalloc(sizeof(*frag), GFP_NOFS);
138 if (!frag) {
139 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
140 "frag %x\n", &ci->vfs_inode,
141 ceph_vinop(&ci->vfs_inode), f);
142 return ERR_PTR(-ENOMEM);
143 }
144 frag->frag = f;
145 frag->split_by = 0;
146 frag->mds = -1;
147 frag->ndist = 0;
148
149 rb_link_node(&frag->node, parent, p);
150 rb_insert_color(&frag->node, &ci->i_fragtree);
151
152 dout("get_or_create_frag added %llx.%llx frag %x\n",
153 ceph_vinop(&ci->vfs_inode), f);
154 return frag;
155 }
156
157 /*
158 * find a specific frag @f
159 */
160 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
161 {
162 struct rb_node *n = ci->i_fragtree.rb_node;
163
164 while (n) {
165 struct ceph_inode_frag *frag =
166 rb_entry(n, struct ceph_inode_frag, node);
167 int c = ceph_frag_compare(f, frag->frag);
168 if (c < 0)
169 n = n->rb_left;
170 else if (c > 0)
171 n = n->rb_right;
172 else
173 return frag;
174 }
175 return NULL;
176 }
177
178 /*
179 * Choose frag containing the given value @v. If @pfrag is
180 * specified, copy the frag delegation info to the caller if
181 * it is present.
182 */
183 static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
184 struct ceph_inode_frag *pfrag, int *found)
185 {
186 u32 t = ceph_frag_make(0, 0);
187 struct ceph_inode_frag *frag;
188 unsigned nway, i;
189 u32 n;
190
191 if (found)
192 *found = 0;
193
194 while (1) {
195 WARN_ON(!ceph_frag_contains_value(t, v));
196 frag = __ceph_find_frag(ci, t);
197 if (!frag)
198 break; /* t is a leaf */
199 if (frag->split_by == 0) {
200 if (pfrag)
201 memcpy(pfrag, frag, sizeof(*pfrag));
202 if (found)
203 *found = 1;
204 break;
205 }
206
207 /* choose child */
208 nway = 1 << frag->split_by;
209 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
210 frag->split_by, nway);
211 for (i = 0; i < nway; i++) {
212 n = ceph_frag_make_child(t, frag->split_by, i);
213 if (ceph_frag_contains_value(n, v)) {
214 t = n;
215 break;
216 }
217 }
218 BUG_ON(i == nway);
219 }
220 dout("choose_frag(%x) = %x\n", v, t);
221
222 return t;
223 }
224
225 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
226 struct ceph_inode_frag *pfrag, int *found)
227 {
228 u32 ret;
229 mutex_lock(&ci->i_fragtree_mutex);
230 ret = __ceph_choose_frag(ci, v, pfrag, found);
231 mutex_unlock(&ci->i_fragtree_mutex);
232 return ret;
233 }
234
235 /*
236 * Process dirfrag (delegation) info from the mds. Include leaf
237 * fragment in tree ONLY if ndist > 0. Otherwise, only
238 * branches/splits are included in i_fragtree)
239 */
240 static int ceph_fill_dirfrag(struct inode *inode,
241 struct ceph_mds_reply_dirfrag *dirinfo)
242 {
243 struct ceph_inode_info *ci = ceph_inode(inode);
244 struct ceph_inode_frag *frag;
245 u32 id = le32_to_cpu(dirinfo->frag);
246 int mds = le32_to_cpu(dirinfo->auth);
247 int ndist = le32_to_cpu(dirinfo->ndist);
248 int diri_auth = -1;
249 int i;
250 int err = 0;
251
252 spin_lock(&ci->i_ceph_lock);
253 if (ci->i_auth_cap)
254 diri_auth = ci->i_auth_cap->mds;
255 spin_unlock(&ci->i_ceph_lock);
256
257 mutex_lock(&ci->i_fragtree_mutex);
258 if (ndist == 0 && mds == diri_auth) {
259 /* no delegation info needed. */
260 frag = __ceph_find_frag(ci, id);
261 if (!frag)
262 goto out;
263 if (frag->split_by == 0) {
264 /* tree leaf, remove */
265 dout("fill_dirfrag removed %llx.%llx frag %x"
266 " (no ref)\n", ceph_vinop(inode), id);
267 rb_erase(&frag->node, &ci->i_fragtree);
268 kfree(frag);
269 } else {
270 /* tree branch, keep and clear */
271 dout("fill_dirfrag cleared %llx.%llx frag %x"
272 " referral\n", ceph_vinop(inode), id);
273 frag->mds = -1;
274 frag->ndist = 0;
275 }
276 goto out;
277 }
278
279
280 /* find/add this frag to store mds delegation info */
281 frag = __get_or_create_frag(ci, id);
282 if (IS_ERR(frag)) {
283 /* this is not the end of the world; we can continue
284 with bad/inaccurate delegation info */
285 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
286 ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
287 err = -ENOMEM;
288 goto out;
289 }
290
291 frag->mds = mds;
292 frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
293 for (i = 0; i < frag->ndist; i++)
294 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
295 dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
296 ceph_vinop(inode), frag->frag, frag->ndist);
297
298 out:
299 mutex_unlock(&ci->i_fragtree_mutex);
300 return err;
301 }
302
303 static int ceph_fill_fragtree(struct inode *inode,
304 struct ceph_frag_tree_head *fragtree,
305 struct ceph_mds_reply_dirfrag *dirinfo)
306 {
307 struct ceph_inode_info *ci = ceph_inode(inode);
308 struct ceph_inode_frag *frag;
309 struct rb_node *rb_node;
310 int i;
311 u32 id, nsplits;
312 bool update = false;
313
314 mutex_lock(&ci->i_fragtree_mutex);
315 nsplits = le32_to_cpu(fragtree->nsplits);
316 if (nsplits) {
317 i = prandom_u32() % nsplits;
318 id = le32_to_cpu(fragtree->splits[i].frag);
319 if (!__ceph_find_frag(ci, id))
320 update = true;
321 } else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) {
322 rb_node = rb_first(&ci->i_fragtree);
323 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
324 if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node))
325 update = true;
326 }
327 if (!update && dirinfo) {
328 id = le32_to_cpu(dirinfo->frag);
329 if (id != __ceph_choose_frag(ci, id, NULL, NULL))
330 update = true;
331 }
332 if (!update)
333 goto out_unlock;
334
335 dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode));
336 rb_node = rb_first(&ci->i_fragtree);
337 for (i = 0; i < nsplits; i++) {
338 id = le32_to_cpu(fragtree->splits[i].frag);
339 frag = NULL;
340 while (rb_node) {
341 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
342 if (ceph_frag_compare(frag->frag, id) >= 0) {
343 if (frag->frag != id)
344 frag = NULL;
345 else
346 rb_node = rb_next(rb_node);
347 break;
348 }
349 rb_node = rb_next(rb_node);
350 rb_erase(&frag->node, &ci->i_fragtree);
351 kfree(frag);
352 frag = NULL;
353 }
354 if (!frag) {
355 frag = __get_or_create_frag(ci, id);
356 if (IS_ERR(frag))
357 continue;
358 }
359 frag->split_by = le32_to_cpu(fragtree->splits[i].by);
360 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
361 }
362 while (rb_node) {
363 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
364 rb_node = rb_next(rb_node);
365 rb_erase(&frag->node, &ci->i_fragtree);
366 kfree(frag);
367 }
368 out_unlock:
369 mutex_unlock(&ci->i_fragtree_mutex);
370 return 0;
371 }
372
373 /*
374 * initialize a newly allocated inode.
375 */
376 struct inode *ceph_alloc_inode(struct super_block *sb)
377 {
378 struct ceph_inode_info *ci;
379 int i;
380
381 ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
382 if (!ci)
383 return NULL;
384
385 dout("alloc_inode %p\n", &ci->vfs_inode);
386
387 spin_lock_init(&ci->i_ceph_lock);
388
389 ci->i_version = 0;
390 ci->i_inline_version = 0;
391 ci->i_time_warp_seq = 0;
392 ci->i_ceph_flags = 0;
393 ci->i_ordered_count = 0;
394 atomic_set(&ci->i_release_count, 1);
395 atomic_set(&ci->i_complete_count, 0);
396 ci->i_symlink = NULL;
397
398 memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
399
400 ci->i_fragtree = RB_ROOT;
401 mutex_init(&ci->i_fragtree_mutex);
402
403 ci->i_xattrs.blob = NULL;
404 ci->i_xattrs.prealloc_blob = NULL;
405 ci->i_xattrs.dirty = false;
406 ci->i_xattrs.index = RB_ROOT;
407 ci->i_xattrs.count = 0;
408 ci->i_xattrs.names_size = 0;
409 ci->i_xattrs.vals_size = 0;
410 ci->i_xattrs.version = 0;
411 ci->i_xattrs.index_version = 0;
412
413 ci->i_caps = RB_ROOT;
414 ci->i_auth_cap = NULL;
415 ci->i_dirty_caps = 0;
416 ci->i_flushing_caps = 0;
417 INIT_LIST_HEAD(&ci->i_dirty_item);
418 INIT_LIST_HEAD(&ci->i_flushing_item);
419 ci->i_cap_flush_seq = 0;
420 ci->i_cap_flush_last_tid = 0;
421 memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
422 init_waitqueue_head(&ci->i_cap_wq);
423 ci->i_hold_caps_min = 0;
424 ci->i_hold_caps_max = 0;
425 INIT_LIST_HEAD(&ci->i_cap_delay_list);
426 INIT_LIST_HEAD(&ci->i_cap_snaps);
427 ci->i_head_snapc = NULL;
428 ci->i_snap_caps = 0;
429
430 for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
431 ci->i_nr_by_mode[i] = 0;
432
433 mutex_init(&ci->i_truncate_mutex);
434 ci->i_truncate_seq = 0;
435 ci->i_truncate_size = 0;
436 ci->i_truncate_pending = 0;
437
438 ci->i_max_size = 0;
439 ci->i_reported_size = 0;
440 ci->i_wanted_max_size = 0;
441 ci->i_requested_max_size = 0;
442
443 ci->i_pin_ref = 0;
444 ci->i_rd_ref = 0;
445 ci->i_rdcache_ref = 0;
446 ci->i_wr_ref = 0;
447 ci->i_wb_ref = 0;
448 ci->i_wrbuffer_ref = 0;
449 ci->i_wrbuffer_ref_head = 0;
450 ci->i_shared_gen = 0;
451 ci->i_rdcache_gen = 0;
452 ci->i_rdcache_revoking = 0;
453
454 INIT_LIST_HEAD(&ci->i_unsafe_writes);
455 INIT_LIST_HEAD(&ci->i_unsafe_dirops);
456 spin_lock_init(&ci->i_unsafe_lock);
457
458 ci->i_snap_realm = NULL;
459 INIT_LIST_HEAD(&ci->i_snap_realm_item);
460 INIT_LIST_HEAD(&ci->i_snap_flush_item);
461
462 INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
463 INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
464
465 INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
466
467 ceph_fscache_inode_init(ci);
468
469 return &ci->vfs_inode;
470 }
471
472 static void ceph_i_callback(struct rcu_head *head)
473 {
474 struct inode *inode = container_of(head, struct inode, i_rcu);
475 struct ceph_inode_info *ci = ceph_inode(inode);
476
477 kmem_cache_free(ceph_inode_cachep, ci);
478 }
479
480 void ceph_destroy_inode(struct inode *inode)
481 {
482 struct ceph_inode_info *ci = ceph_inode(inode);
483 struct ceph_inode_frag *frag;
484 struct rb_node *n;
485
486 dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
487
488 ceph_fscache_unregister_inode_cookie(ci);
489
490 ceph_queue_caps_release(inode);
491
492 /*
493 * we may still have a snap_realm reference if there are stray
494 * caps in i_snap_caps.
495 */
496 if (ci->i_snap_realm) {
497 struct ceph_mds_client *mdsc =
498 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
499 struct ceph_snap_realm *realm = ci->i_snap_realm;
500
501 dout(" dropping residual ref to snap realm %p\n", realm);
502 spin_lock(&realm->inodes_with_caps_lock);
503 list_del_init(&ci->i_snap_realm_item);
504 spin_unlock(&realm->inodes_with_caps_lock);
505 ceph_put_snap_realm(mdsc, realm);
506 }
507
508 kfree(ci->i_symlink);
509 while ((n = rb_first(&ci->i_fragtree)) != NULL) {
510 frag = rb_entry(n, struct ceph_inode_frag, node);
511 rb_erase(n, &ci->i_fragtree);
512 kfree(frag);
513 }
514
515 __ceph_destroy_xattrs(ci);
516 if (ci->i_xattrs.blob)
517 ceph_buffer_put(ci->i_xattrs.blob);
518 if (ci->i_xattrs.prealloc_blob)
519 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
520
521 call_rcu(&inode->i_rcu, ceph_i_callback);
522 }
523
524 int ceph_drop_inode(struct inode *inode)
525 {
526 /*
527 * Positve dentry and corresponding inode are always accompanied
528 * in MDS reply. So no need to keep inode in the cache after
529 * dropping all its aliases.
530 */
531 return 1;
532 }
533
534 /*
535 * Helpers to fill in size, ctime, mtime, and atime. We have to be
536 * careful because either the client or MDS may have more up to date
537 * info, depending on which capabilities are held, and whether
538 * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime
539 * and size are monotonically increasing, except when utimes() or
540 * truncate() increments the corresponding _seq values.)
541 */
542 int ceph_fill_file_size(struct inode *inode, int issued,
543 u32 truncate_seq, u64 truncate_size, u64 size)
544 {
545 struct ceph_inode_info *ci = ceph_inode(inode);
546 int queue_trunc = 0;
547
548 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
549 (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
550 dout("size %lld -> %llu\n", inode->i_size, size);
551 inode->i_size = size;
552 inode->i_blocks = (size + (1<<9) - 1) >> 9;
553 ci->i_reported_size = size;
554 if (truncate_seq != ci->i_truncate_seq) {
555 dout("truncate_seq %u -> %u\n",
556 ci->i_truncate_seq, truncate_seq);
557 ci->i_truncate_seq = truncate_seq;
558
559 /* the MDS should have revoked these caps */
560 WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
561 CEPH_CAP_FILE_RD |
562 CEPH_CAP_FILE_WR |
563 CEPH_CAP_FILE_LAZYIO));
564 /*
565 * If we hold relevant caps, or in the case where we're
566 * not the only client referencing this file and we
567 * don't hold those caps, then we need to check whether
568 * the file is either opened or mmaped
569 */
570 if ((issued & (CEPH_CAP_FILE_CACHE|
571 CEPH_CAP_FILE_BUFFER)) ||
572 mapping_mapped(inode->i_mapping) ||
573 __ceph_caps_file_wanted(ci)) {
574 ci->i_truncate_pending++;
575 queue_trunc = 1;
576 }
577 }
578 }
579 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
580 ci->i_truncate_size != truncate_size) {
581 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
582 truncate_size);
583 ci->i_truncate_size = truncate_size;
584 }
585
586 if (queue_trunc)
587 ceph_fscache_invalidate(inode);
588
589 return queue_trunc;
590 }
591
592 void ceph_fill_file_time(struct inode *inode, int issued,
593 u64 time_warp_seq, struct timespec *ctime,
594 struct timespec *mtime, struct timespec *atime)
595 {
596 struct ceph_inode_info *ci = ceph_inode(inode);
597 int warn = 0;
598
599 if (issued & (CEPH_CAP_FILE_EXCL|
600 CEPH_CAP_FILE_WR|
601 CEPH_CAP_FILE_BUFFER|
602 CEPH_CAP_AUTH_EXCL|
603 CEPH_CAP_XATTR_EXCL)) {
604 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
605 dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
606 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
607 ctime->tv_sec, ctime->tv_nsec);
608 inode->i_ctime = *ctime;
609 }
610 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
611 /* the MDS did a utimes() */
612 dout("mtime %ld.%09ld -> %ld.%09ld "
613 "tw %d -> %d\n",
614 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
615 mtime->tv_sec, mtime->tv_nsec,
616 ci->i_time_warp_seq, (int)time_warp_seq);
617
618 inode->i_mtime = *mtime;
619 inode->i_atime = *atime;
620 ci->i_time_warp_seq = time_warp_seq;
621 } else if (time_warp_seq == ci->i_time_warp_seq) {
622 /* nobody did utimes(); take the max */
623 if (timespec_compare(mtime, &inode->i_mtime) > 0) {
624 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
625 inode->i_mtime.tv_sec,
626 inode->i_mtime.tv_nsec,
627 mtime->tv_sec, mtime->tv_nsec);
628 inode->i_mtime = *mtime;
629 }
630 if (timespec_compare(atime, &inode->i_atime) > 0) {
631 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
632 inode->i_atime.tv_sec,
633 inode->i_atime.tv_nsec,
634 atime->tv_sec, atime->tv_nsec);
635 inode->i_atime = *atime;
636 }
637 } else if (issued & CEPH_CAP_FILE_EXCL) {
638 /* we did a utimes(); ignore mds values */
639 } else {
640 warn = 1;
641 }
642 } else {
643 /* we have no write|excl caps; whatever the MDS says is true */
644 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
645 inode->i_ctime = *ctime;
646 inode->i_mtime = *mtime;
647 inode->i_atime = *atime;
648 ci->i_time_warp_seq = time_warp_seq;
649 } else {
650 warn = 1;
651 }
652 }
653 if (warn) /* time_warp_seq shouldn't go backwards */
654 dout("%p mds time_warp_seq %llu < %u\n",
655 inode, time_warp_seq, ci->i_time_warp_seq);
656 }
657
658 /*
659 * Populate an inode based on info from mds. May be called on new or
660 * existing inodes.
661 */
662 static int fill_inode(struct inode *inode, struct page *locked_page,
663 struct ceph_mds_reply_info_in *iinfo,
664 struct ceph_mds_reply_dirfrag *dirinfo,
665 struct ceph_mds_session *session,
666 unsigned long ttl_from, int cap_fmode,
667 struct ceph_cap_reservation *caps_reservation)
668 {
669 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
670 struct ceph_mds_reply_inode *info = iinfo->in;
671 struct ceph_inode_info *ci = ceph_inode(inode);
672 int issued = 0, implemented, new_issued;
673 struct timespec mtime, atime, ctime;
674 struct ceph_buffer *xattr_blob = NULL;
675 struct ceph_cap *new_cap = NULL;
676 int err = 0;
677 bool wake = false;
678 bool queue_trunc = false;
679 bool new_version = false;
680 bool fill_inline = false;
681
682 dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
683 inode, ceph_vinop(inode), le64_to_cpu(info->version),
684 ci->i_version);
685
686 /* prealloc new cap struct */
687 if (info->cap.caps && ceph_snap(inode) == CEPH_NOSNAP)
688 new_cap = ceph_get_cap(mdsc, caps_reservation);
689
690 /*
691 * prealloc xattr data, if it looks like we'll need it. only
692 * if len > 4 (meaning there are actually xattrs; the first 4
693 * bytes are the xattr count).
694 */
695 if (iinfo->xattr_len > 4) {
696 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
697 if (!xattr_blob)
698 pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
699 iinfo->xattr_len);
700 }
701
702 spin_lock(&ci->i_ceph_lock);
703
704 /*
705 * provided version will be odd if inode value is projected,
706 * even if stable. skip the update if we have newer stable
707 * info (ours>=theirs, e.g. due to racing mds replies), unless
708 * we are getting projected (unstable) info (in which case the
709 * version is odd, and we want ours>theirs).
710 * us them
711 * 2 2 skip
712 * 3 2 skip
713 * 3 3 update
714 */
715 if (ci->i_version == 0 ||
716 ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
717 le64_to_cpu(info->version) > (ci->i_version & ~1)))
718 new_version = true;
719
720 issued = __ceph_caps_issued(ci, &implemented);
721 issued |= implemented | __ceph_caps_dirty(ci);
722 new_issued = ~issued & le32_to_cpu(info->cap.caps);
723
724 /* update inode */
725 ci->i_version = le64_to_cpu(info->version);
726 inode->i_version++;
727 inode->i_rdev = le32_to_cpu(info->rdev);
728 inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
729
730 if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
731 (issued & CEPH_CAP_AUTH_EXCL) == 0) {
732 inode->i_mode = le32_to_cpu(info->mode);
733 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
734 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
735 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
736 from_kuid(&init_user_ns, inode->i_uid),
737 from_kgid(&init_user_ns, inode->i_gid));
738 }
739
740 if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
741 (issued & CEPH_CAP_LINK_EXCL) == 0)
742 set_nlink(inode, le32_to_cpu(info->nlink));
743
744 if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
745 /* be careful with mtime, atime, size */
746 ceph_decode_timespec(&atime, &info->atime);
747 ceph_decode_timespec(&mtime, &info->mtime);
748 ceph_decode_timespec(&ctime, &info->ctime);
749 ceph_fill_file_time(inode, issued,
750 le32_to_cpu(info->time_warp_seq),
751 &ctime, &mtime, &atime);
752 }
753
754 if (new_version ||
755 (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
756 ci->i_layout = info->layout;
757 queue_trunc = ceph_fill_file_size(inode, issued,
758 le32_to_cpu(info->truncate_seq),
759 le64_to_cpu(info->truncate_size),
760 le64_to_cpu(info->size));
761 /* only update max_size on auth cap */
762 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
763 ci->i_max_size != le64_to_cpu(info->max_size)) {
764 dout("max_size %lld -> %llu\n", ci->i_max_size,
765 le64_to_cpu(info->max_size));
766 ci->i_max_size = le64_to_cpu(info->max_size);
767 }
768 }
769
770 /* xattrs */
771 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
772 if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL)) &&
773 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
774 if (ci->i_xattrs.blob)
775 ceph_buffer_put(ci->i_xattrs.blob);
776 ci->i_xattrs.blob = xattr_blob;
777 if (xattr_blob)
778 memcpy(ci->i_xattrs.blob->vec.iov_base,
779 iinfo->xattr_data, iinfo->xattr_len);
780 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
781 ceph_forget_all_cached_acls(inode);
782 xattr_blob = NULL;
783 }
784
785 inode->i_mapping->a_ops = &ceph_aops;
786 inode->i_mapping->backing_dev_info =
787 &ceph_sb_to_client(inode->i_sb)->backing_dev_info;
788
789 switch (inode->i_mode & S_IFMT) {
790 case S_IFIFO:
791 case S_IFBLK:
792 case S_IFCHR:
793 case S_IFSOCK:
794 init_special_inode(inode, inode->i_mode, inode->i_rdev);
795 inode->i_op = &ceph_file_iops;
796 break;
797 case S_IFREG:
798 inode->i_op = &ceph_file_iops;
799 inode->i_fop = &ceph_file_fops;
800 break;
801 case S_IFLNK:
802 inode->i_op = &ceph_symlink_iops;
803 if (!ci->i_symlink) {
804 u32 symlen = iinfo->symlink_len;
805 char *sym;
806
807 spin_unlock(&ci->i_ceph_lock);
808
809 err = -EINVAL;
810 if (WARN_ON(symlen != inode->i_size))
811 goto out;
812
813 err = -ENOMEM;
814 sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
815 if (!sym)
816 goto out;
817
818 spin_lock(&ci->i_ceph_lock);
819 if (!ci->i_symlink)
820 ci->i_symlink = sym;
821 else
822 kfree(sym); /* lost a race */
823 }
824 break;
825 case S_IFDIR:
826 inode->i_op = &ceph_dir_iops;
827 inode->i_fop = &ceph_dir_fops;
828
829 ci->i_dir_layout = iinfo->dir_layout;
830
831 ci->i_files = le64_to_cpu(info->files);
832 ci->i_subdirs = le64_to_cpu(info->subdirs);
833 ci->i_rbytes = le64_to_cpu(info->rbytes);
834 ci->i_rfiles = le64_to_cpu(info->rfiles);
835 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
836 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
837 break;
838 default:
839 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
840 ceph_vinop(inode), inode->i_mode);
841 }
842
843 /* set dir completion flag? */
844 if (S_ISDIR(inode->i_mode) &&
845 ci->i_files == 0 && ci->i_subdirs == 0 &&
846 ceph_snap(inode) == CEPH_NOSNAP &&
847 (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
848 (issued & CEPH_CAP_FILE_EXCL) == 0 &&
849 !__ceph_dir_is_complete(ci)) {
850 dout(" marking %p complete (empty)\n", inode);
851 __ceph_dir_set_complete(ci, atomic_read(&ci->i_release_count),
852 ci->i_ordered_count);
853 }
854
855 /* were we issued a capability? */
856 if (info->cap.caps) {
857 if (ceph_snap(inode) == CEPH_NOSNAP) {
858 ceph_add_cap(inode, session,
859 le64_to_cpu(info->cap.cap_id),
860 cap_fmode,
861 le32_to_cpu(info->cap.caps),
862 le32_to_cpu(info->cap.wanted),
863 le32_to_cpu(info->cap.seq),
864 le32_to_cpu(info->cap.mseq),
865 le64_to_cpu(info->cap.realm),
866 info->cap.flags, &new_cap);
867 wake = true;
868 } else {
869 dout(" %p got snap_caps %s\n", inode,
870 ceph_cap_string(le32_to_cpu(info->cap.caps)));
871 ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
872 if (cap_fmode >= 0)
873 __ceph_get_fmode(ci, cap_fmode);
874 }
875 } else if (cap_fmode >= 0) {
876 pr_warn("mds issued no caps on %llx.%llx\n",
877 ceph_vinop(inode));
878 __ceph_get_fmode(ci, cap_fmode);
879 }
880
881 if (iinfo->inline_version > 0 &&
882 iinfo->inline_version >= ci->i_inline_version) {
883 int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
884 ci->i_inline_version = iinfo->inline_version;
885 if (ci->i_inline_version != CEPH_INLINE_NONE &&
886 (locked_page ||
887 (le32_to_cpu(info->cap.caps) & cache_caps)))
888 fill_inline = true;
889 }
890
891 spin_unlock(&ci->i_ceph_lock);
892
893 if (fill_inline)
894 ceph_fill_inline_data(inode, locked_page,
895 iinfo->inline_data, iinfo->inline_len);
896
897 if (wake)
898 wake_up_all(&ci->i_cap_wq);
899
900 /* queue truncate if we saw i_size decrease */
901 if (queue_trunc)
902 ceph_queue_vmtruncate(inode);
903
904 /* populate frag tree */
905 if (S_ISDIR(inode->i_mode))
906 ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
907
908 /* update delegation info? */
909 if (dirinfo)
910 ceph_fill_dirfrag(inode, dirinfo);
911
912 err = 0;
913 out:
914 if (new_cap)
915 ceph_put_cap(mdsc, new_cap);
916 if (xattr_blob)
917 ceph_buffer_put(xattr_blob);
918 return err;
919 }
920
921 /*
922 * caller should hold session s_mutex.
923 */
924 static void update_dentry_lease(struct dentry *dentry,
925 struct ceph_mds_reply_lease *lease,
926 struct ceph_mds_session *session,
927 unsigned long from_time)
928 {
929 struct ceph_dentry_info *di = ceph_dentry(dentry);
930 long unsigned duration = le32_to_cpu(lease->duration_ms);
931 long unsigned ttl = from_time + (duration * HZ) / 1000;
932 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
933 struct inode *dir;
934
935 /* only track leases on regular dentries */
936 if (dentry->d_op != &ceph_dentry_ops)
937 return;
938
939 spin_lock(&dentry->d_lock);
940 dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
941 dentry, duration, ttl);
942
943 /* make lease_rdcache_gen match directory */
944 dir = dentry->d_parent->d_inode;
945 di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
946
947 if (duration == 0)
948 goto out_unlock;
949
950 if (di->lease_gen == session->s_cap_gen &&
951 time_before(ttl, dentry->d_time))
952 goto out_unlock; /* we already have a newer lease. */
953
954 if (di->lease_session && di->lease_session != session)
955 goto out_unlock;
956
957 ceph_dentry_lru_touch(dentry);
958
959 if (!di->lease_session)
960 di->lease_session = ceph_get_mds_session(session);
961 di->lease_gen = session->s_cap_gen;
962 di->lease_seq = le32_to_cpu(lease->seq);
963 di->lease_renew_after = half_ttl;
964 di->lease_renew_from = 0;
965 dentry->d_time = ttl;
966 out_unlock:
967 spin_unlock(&dentry->d_lock);
968 return;
969 }
970
971 /*
972 * splice a dentry to an inode.
973 * caller must hold directory i_mutex for this to be safe.
974 *
975 * we will only rehash the resulting dentry if @prehash is
976 * true; @prehash will be set to false (for the benefit of
977 * the caller) if we fail.
978 */
979 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
980 bool *prehash)
981 {
982 struct dentry *realdn;
983
984 BUG_ON(dn->d_inode);
985
986 /* dn must be unhashed */
987 if (!d_unhashed(dn))
988 d_drop(dn);
989 realdn = d_materialise_unique(dn, in);
990 if (IS_ERR(realdn)) {
991 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
992 PTR_ERR(realdn), dn, in, ceph_vinop(in));
993 if (prehash)
994 *prehash = false; /* don't rehash on error */
995 dn = realdn; /* note realdn contains the error */
996 goto out;
997 } else if (realdn) {
998 dout("dn %p (%d) spliced with %p (%d) "
999 "inode %p ino %llx.%llx\n",
1000 dn, d_count(dn),
1001 realdn, d_count(realdn),
1002 realdn->d_inode, ceph_vinop(realdn->d_inode));
1003 dput(dn);
1004 dn = realdn;
1005 } else {
1006 BUG_ON(!ceph_dentry(dn));
1007 dout("dn %p attached to %p ino %llx.%llx\n",
1008 dn, dn->d_inode, ceph_vinop(dn->d_inode));
1009 }
1010 if ((!prehash || *prehash) && d_unhashed(dn))
1011 d_rehash(dn);
1012 out:
1013 return dn;
1014 }
1015
1016 /*
1017 * Incorporate results into the local cache. This is either just
1018 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1019 * after a lookup).
1020 *
1021 * A reply may contain
1022 * a directory inode along with a dentry.
1023 * and/or a target inode
1024 *
1025 * Called with snap_rwsem (read).
1026 */
1027 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
1028 struct ceph_mds_session *session)
1029 {
1030 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1031 struct inode *in = NULL;
1032 struct ceph_vino vino;
1033 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1034 int err = 0;
1035
1036 dout("fill_trace %p is_dentry %d is_target %d\n", req,
1037 rinfo->head->is_dentry, rinfo->head->is_target);
1038
1039 #if 0
1040 /*
1041 * Debugging hook:
1042 *
1043 * If we resend completed ops to a recovering mds, we get no
1044 * trace. Since that is very rare, pretend this is the case
1045 * to ensure the 'no trace' handlers in the callers behave.
1046 *
1047 * Fill in inodes unconditionally to avoid breaking cap
1048 * invariants.
1049 */
1050 if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
1051 pr_info("fill_trace faking empty trace on %lld %s\n",
1052 req->r_tid, ceph_mds_op_name(rinfo->head->op));
1053 if (rinfo->head->is_dentry) {
1054 rinfo->head->is_dentry = 0;
1055 err = fill_inode(req->r_locked_dir,
1056 &rinfo->diri, rinfo->dirfrag,
1057 session, req->r_request_started, -1);
1058 }
1059 if (rinfo->head->is_target) {
1060 rinfo->head->is_target = 0;
1061 ininfo = rinfo->targeti.in;
1062 vino.ino = le64_to_cpu(ininfo->ino);
1063 vino.snap = le64_to_cpu(ininfo->snapid);
1064 in = ceph_get_inode(sb, vino);
1065 err = fill_inode(in, &rinfo->targeti, NULL,
1066 session, req->r_request_started,
1067 req->r_fmode);
1068 iput(in);
1069 }
1070 }
1071 #endif
1072
1073 if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1074 dout("fill_trace reply is empty!\n");
1075 if (rinfo->head->result == 0 && req->r_locked_dir)
1076 ceph_invalidate_dir_request(req);
1077 return 0;
1078 }
1079
1080 if (rinfo->head->is_dentry) {
1081 struct inode *dir = req->r_locked_dir;
1082
1083 if (dir) {
1084 err = fill_inode(dir, NULL,
1085 &rinfo->diri, rinfo->dirfrag,
1086 session, req->r_request_started, -1,
1087 &req->r_caps_reservation);
1088 if (err < 0)
1089 goto done;
1090 } else {
1091 WARN_ON_ONCE(1);
1092 }
1093
1094 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME) {
1095 struct qstr dname;
1096 struct dentry *dn, *parent;
1097
1098 BUG_ON(!rinfo->head->is_target);
1099 BUG_ON(req->r_dentry);
1100
1101 parent = d_find_any_alias(dir);
1102 BUG_ON(!parent);
1103
1104 dname.name = rinfo->dname;
1105 dname.len = rinfo->dname_len;
1106 dname.hash = full_name_hash(dname.name, dname.len);
1107 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1108 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1109 retry_lookup:
1110 dn = d_lookup(parent, &dname);
1111 dout("d_lookup on parent=%p name=%.*s got %p\n",
1112 parent, dname.len, dname.name, dn);
1113
1114 if (!dn) {
1115 dn = d_alloc(parent, &dname);
1116 dout("d_alloc %p '%.*s' = %p\n", parent,
1117 dname.len, dname.name, dn);
1118 if (dn == NULL) {
1119 dput(parent);
1120 err = -ENOMEM;
1121 goto done;
1122 }
1123 err = ceph_init_dentry(dn);
1124 if (err < 0) {
1125 dput(dn);
1126 dput(parent);
1127 goto done;
1128 }
1129 } else if (dn->d_inode &&
1130 (ceph_ino(dn->d_inode) != vino.ino ||
1131 ceph_snap(dn->d_inode) != vino.snap)) {
1132 dout(" dn %p points to wrong inode %p\n",
1133 dn, dn->d_inode);
1134 d_delete(dn);
1135 dput(dn);
1136 goto retry_lookup;
1137 }
1138
1139 req->r_dentry = dn;
1140 dput(parent);
1141 }
1142 }
1143
1144 if (rinfo->head->is_target) {
1145 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1146 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1147
1148 in = ceph_get_inode(sb, vino);
1149 if (IS_ERR(in)) {
1150 err = PTR_ERR(in);
1151 goto done;
1152 }
1153 req->r_target_inode = in;
1154
1155 err = fill_inode(in, req->r_locked_page, &rinfo->targeti, NULL,
1156 session, req->r_request_started,
1157 (!req->r_aborted && rinfo->head->result == 0) ?
1158 req->r_fmode : -1,
1159 &req->r_caps_reservation);
1160 if (err < 0) {
1161 pr_err("fill_inode badness %p %llx.%llx\n",
1162 in, ceph_vinop(in));
1163 goto done;
1164 }
1165 }
1166
1167 /*
1168 * ignore null lease/binding on snapdir ENOENT, or else we
1169 * will have trouble splicing in the virtual snapdir later
1170 */
1171 if (rinfo->head->is_dentry && !req->r_aborted &&
1172 req->r_locked_dir &&
1173 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1174 fsc->mount_options->snapdir_name,
1175 req->r_dentry->d_name.len))) {
1176 /*
1177 * lookup link rename : null -> possibly existing inode
1178 * mknod symlink mkdir : null -> new inode
1179 * unlink : linked -> null
1180 */
1181 struct inode *dir = req->r_locked_dir;
1182 struct dentry *dn = req->r_dentry;
1183 bool have_dir_cap, have_lease;
1184
1185 BUG_ON(!dn);
1186 BUG_ON(!dir);
1187 BUG_ON(dn->d_parent->d_inode != dir);
1188 BUG_ON(ceph_ino(dir) !=
1189 le64_to_cpu(rinfo->diri.in->ino));
1190 BUG_ON(ceph_snap(dir) !=
1191 le64_to_cpu(rinfo->diri.in->snapid));
1192
1193 /* do we have a lease on the whole dir? */
1194 have_dir_cap =
1195 (le32_to_cpu(rinfo->diri.in->cap.caps) &
1196 CEPH_CAP_FILE_SHARED);
1197
1198 /* do we have a dn lease? */
1199 have_lease = have_dir_cap ||
1200 le32_to_cpu(rinfo->dlease->duration_ms);
1201 if (!have_lease)
1202 dout("fill_trace no dentry lease or dir cap\n");
1203
1204 /* rename? */
1205 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1206 struct inode *olddir = req->r_old_dentry_dir;
1207 BUG_ON(!olddir);
1208
1209 dout(" src %p '%.*s' dst %p '%.*s'\n",
1210 req->r_old_dentry,
1211 req->r_old_dentry->d_name.len,
1212 req->r_old_dentry->d_name.name,
1213 dn, dn->d_name.len, dn->d_name.name);
1214 dout("fill_trace doing d_move %p -> %p\n",
1215 req->r_old_dentry, dn);
1216
1217 d_move(req->r_old_dentry, dn);
1218 dout(" src %p '%.*s' dst %p '%.*s'\n",
1219 req->r_old_dentry,
1220 req->r_old_dentry->d_name.len,
1221 req->r_old_dentry->d_name.name,
1222 dn, dn->d_name.len, dn->d_name.name);
1223
1224 /* ensure target dentry is invalidated, despite
1225 rehashing bug in vfs_rename_dir */
1226 ceph_invalidate_dentry_lease(dn);
1227
1228 /* d_move screws up sibling dentries' offsets */
1229 ceph_dir_clear_ordered(dir);
1230 ceph_dir_clear_ordered(olddir);
1231
1232 dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1233 ceph_dentry(req->r_old_dentry)->offset);
1234
1235 dn = req->r_old_dentry; /* use old_dentry */
1236 }
1237
1238 /* null dentry? */
1239 if (!rinfo->head->is_target) {
1240 dout("fill_trace null dentry\n");
1241 if (dn->d_inode) {
1242 ceph_dir_clear_ordered(dir);
1243 dout("d_delete %p\n", dn);
1244 d_delete(dn);
1245 } else {
1246 dout("d_instantiate %p NULL\n", dn);
1247 d_instantiate(dn, NULL);
1248 if (have_lease && d_unhashed(dn))
1249 d_rehash(dn);
1250 update_dentry_lease(dn, rinfo->dlease,
1251 session,
1252 req->r_request_started);
1253 }
1254 goto done;
1255 }
1256
1257 /* attach proper inode */
1258 if (!dn->d_inode) {
1259 ceph_dir_clear_ordered(dir);
1260 ihold(in);
1261 dn = splice_dentry(dn, in, &have_lease);
1262 if (IS_ERR(dn)) {
1263 err = PTR_ERR(dn);
1264 goto done;
1265 }
1266 req->r_dentry = dn; /* may have spliced */
1267 } else if (dn->d_inode && dn->d_inode != in) {
1268 dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1269 dn, dn->d_inode, ceph_vinop(dn->d_inode),
1270 ceph_vinop(in));
1271 have_lease = false;
1272 }
1273
1274 if (have_lease)
1275 update_dentry_lease(dn, rinfo->dlease, session,
1276 req->r_request_started);
1277 dout(" final dn %p\n", dn);
1278 } else if (!req->r_aborted &&
1279 (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1280 req->r_op == CEPH_MDS_OP_MKSNAP)) {
1281 struct dentry *dn = req->r_dentry;
1282 struct inode *dir = req->r_locked_dir;
1283
1284 /* fill out a snapdir LOOKUPSNAP dentry */
1285 BUG_ON(!dn);
1286 BUG_ON(!dir);
1287 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1288 dout(" linking snapped dir %p to dn %p\n", in, dn);
1289 ceph_dir_clear_ordered(dir);
1290 ihold(in);
1291 dn = splice_dentry(dn, in, NULL);
1292 if (IS_ERR(dn)) {
1293 err = PTR_ERR(dn);
1294 goto done;
1295 }
1296 req->r_dentry = dn; /* may have spliced */
1297 }
1298 done:
1299 dout("fill_trace done err=%d\n", err);
1300 return err;
1301 }
1302
1303 /*
1304 * Prepopulate our cache with readdir results, leases, etc.
1305 */
1306 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1307 struct ceph_mds_session *session)
1308 {
1309 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1310 int i, err = 0;
1311
1312 for (i = 0; i < rinfo->dir_nr; i++) {
1313 struct ceph_vino vino;
1314 struct inode *in;
1315 int rc;
1316
1317 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1318 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1319
1320 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1321 if (IS_ERR(in)) {
1322 err = PTR_ERR(in);
1323 dout("new_inode badness got %d\n", err);
1324 continue;
1325 }
1326 rc = fill_inode(in, NULL, &rinfo->dir_in[i], NULL, session,
1327 req->r_request_started, -1,
1328 &req->r_caps_reservation);
1329 if (rc < 0) {
1330 pr_err("fill_inode badness on %p got %d\n", in, rc);
1331 err = rc;
1332 continue;
1333 }
1334 }
1335
1336 return err;
1337 }
1338
1339 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1340 struct ceph_mds_session *session)
1341 {
1342 struct dentry *parent = req->r_dentry;
1343 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1344 struct qstr dname;
1345 struct dentry *dn;
1346 struct inode *in;
1347 int err = 0, ret, i;
1348 struct inode *snapdir = NULL;
1349 struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1350 struct ceph_dentry_info *di;
1351 u64 r_readdir_offset = req->r_readdir_offset;
1352 u32 frag = le32_to_cpu(rhead->args.readdir.frag);
1353
1354 if (rinfo->dir_dir &&
1355 le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1356 dout("readdir_prepopulate got new frag %x -> %x\n",
1357 frag, le32_to_cpu(rinfo->dir_dir->frag));
1358 frag = le32_to_cpu(rinfo->dir_dir->frag);
1359 if (ceph_frag_is_leftmost(frag))
1360 r_readdir_offset = 2;
1361 else
1362 r_readdir_offset = 0;
1363 }
1364
1365 if (req->r_aborted)
1366 return readdir_prepopulate_inodes_only(req, session);
1367
1368 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1369 snapdir = ceph_get_snapdir(parent->d_inode);
1370 parent = d_find_alias(snapdir);
1371 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1372 rinfo->dir_nr, parent);
1373 } else {
1374 dout("readdir_prepopulate %d items under dn %p\n",
1375 rinfo->dir_nr, parent);
1376 if (rinfo->dir_dir)
1377 ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1378 }
1379
1380 /* FIXME: release caps/leases if error occurs */
1381 for (i = 0; i < rinfo->dir_nr; i++) {
1382 struct ceph_vino vino;
1383
1384 dname.name = rinfo->dir_dname[i];
1385 dname.len = rinfo->dir_dname_len[i];
1386 dname.hash = full_name_hash(dname.name, dname.len);
1387
1388 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1389 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1390
1391 retry_lookup:
1392 dn = d_lookup(parent, &dname);
1393 dout("d_lookup on parent=%p name=%.*s got %p\n",
1394 parent, dname.len, dname.name, dn);
1395
1396 if (!dn) {
1397 dn = d_alloc(parent, &dname);
1398 dout("d_alloc %p '%.*s' = %p\n", parent,
1399 dname.len, dname.name, dn);
1400 if (dn == NULL) {
1401 dout("d_alloc badness\n");
1402 err = -ENOMEM;
1403 goto out;
1404 }
1405 ret = ceph_init_dentry(dn);
1406 if (ret < 0) {
1407 dput(dn);
1408 err = ret;
1409 goto out;
1410 }
1411 } else if (dn->d_inode &&
1412 (ceph_ino(dn->d_inode) != vino.ino ||
1413 ceph_snap(dn->d_inode) != vino.snap)) {
1414 dout(" dn %p points to wrong inode %p\n",
1415 dn, dn->d_inode);
1416 d_delete(dn);
1417 dput(dn);
1418 goto retry_lookup;
1419 } else {
1420 /* reorder parent's d_subdirs */
1421 spin_lock(&parent->d_lock);
1422 spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
1423 list_move(&dn->d_u.d_child, &parent->d_subdirs);
1424 spin_unlock(&dn->d_lock);
1425 spin_unlock(&parent->d_lock);
1426 }
1427
1428 /* inode */
1429 if (dn->d_inode) {
1430 in = dn->d_inode;
1431 } else {
1432 in = ceph_get_inode(parent->d_sb, vino);
1433 if (IS_ERR(in)) {
1434 dout("new_inode badness\n");
1435 d_drop(dn);
1436 dput(dn);
1437 err = PTR_ERR(in);
1438 goto out;
1439 }
1440 }
1441
1442 if (fill_inode(in, NULL, &rinfo->dir_in[i], NULL, session,
1443 req->r_request_started, -1,
1444 &req->r_caps_reservation) < 0) {
1445 pr_err("fill_inode badness on %p\n", in);
1446 if (!dn->d_inode)
1447 iput(in);
1448 d_drop(dn);
1449 goto next_item;
1450 }
1451
1452 if (!dn->d_inode) {
1453 dn = splice_dentry(dn, in, NULL);
1454 if (IS_ERR(dn)) {
1455 err = PTR_ERR(dn);
1456 dn = NULL;
1457 goto next_item;
1458 }
1459 }
1460
1461 di = dn->d_fsdata;
1462 di->offset = ceph_make_fpos(frag, i + r_readdir_offset);
1463
1464 update_dentry_lease(dn, rinfo->dir_dlease[i],
1465 req->r_session,
1466 req->r_request_started);
1467 next_item:
1468 if (dn)
1469 dput(dn);
1470 }
1471 if (err == 0)
1472 req->r_did_prepopulate = true;
1473
1474 out:
1475 if (snapdir) {
1476 iput(snapdir);
1477 dput(parent);
1478 }
1479 dout("readdir_prepopulate done\n");
1480 return err;
1481 }
1482
1483 int ceph_inode_set_size(struct inode *inode, loff_t size)
1484 {
1485 struct ceph_inode_info *ci = ceph_inode(inode);
1486 int ret = 0;
1487
1488 spin_lock(&ci->i_ceph_lock);
1489 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1490 inode->i_size = size;
1491 inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1492
1493 /* tell the MDS if we are approaching max_size */
1494 if ((size << 1) >= ci->i_max_size &&
1495 (ci->i_reported_size << 1) < ci->i_max_size)
1496 ret = 1;
1497
1498 spin_unlock(&ci->i_ceph_lock);
1499 return ret;
1500 }
1501
1502 /*
1503 * Write back inode data in a worker thread. (This can't be done
1504 * in the message handler context.)
1505 */
1506 void ceph_queue_writeback(struct inode *inode)
1507 {
1508 ihold(inode);
1509 if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1510 &ceph_inode(inode)->i_wb_work)) {
1511 dout("ceph_queue_writeback %p\n", inode);
1512 } else {
1513 dout("ceph_queue_writeback %p failed\n", inode);
1514 iput(inode);
1515 }
1516 }
1517
1518 static void ceph_writeback_work(struct work_struct *work)
1519 {
1520 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1521 i_wb_work);
1522 struct inode *inode = &ci->vfs_inode;
1523
1524 dout("writeback %p\n", inode);
1525 filemap_fdatawrite(&inode->i_data);
1526 iput(inode);
1527 }
1528
1529 /*
1530 * queue an async invalidation
1531 */
1532 void ceph_queue_invalidate(struct inode *inode)
1533 {
1534 ihold(inode);
1535 if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1536 &ceph_inode(inode)->i_pg_inv_work)) {
1537 dout("ceph_queue_invalidate %p\n", inode);
1538 } else {
1539 dout("ceph_queue_invalidate %p failed\n", inode);
1540 iput(inode);
1541 }
1542 }
1543
1544 /*
1545 * Invalidate inode pages in a worker thread. (This can't be done
1546 * in the message handler context.)
1547 */
1548 static void ceph_invalidate_work(struct work_struct *work)
1549 {
1550 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1551 i_pg_inv_work);
1552 struct inode *inode = &ci->vfs_inode;
1553 u32 orig_gen;
1554 int check = 0;
1555
1556 mutex_lock(&ci->i_truncate_mutex);
1557 spin_lock(&ci->i_ceph_lock);
1558 dout("invalidate_pages %p gen %d revoking %d\n", inode,
1559 ci->i_rdcache_gen, ci->i_rdcache_revoking);
1560 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1561 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1562 check = 1;
1563 spin_unlock(&ci->i_ceph_lock);
1564 mutex_unlock(&ci->i_truncate_mutex);
1565 goto out;
1566 }
1567 orig_gen = ci->i_rdcache_gen;
1568 spin_unlock(&ci->i_ceph_lock);
1569
1570 truncate_pagecache(inode, 0);
1571
1572 spin_lock(&ci->i_ceph_lock);
1573 if (orig_gen == ci->i_rdcache_gen &&
1574 orig_gen == ci->i_rdcache_revoking) {
1575 dout("invalidate_pages %p gen %d successful\n", inode,
1576 ci->i_rdcache_gen);
1577 ci->i_rdcache_revoking--;
1578 check = 1;
1579 } else {
1580 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1581 inode, orig_gen, ci->i_rdcache_gen,
1582 ci->i_rdcache_revoking);
1583 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1584 check = 1;
1585 }
1586 spin_unlock(&ci->i_ceph_lock);
1587 mutex_unlock(&ci->i_truncate_mutex);
1588 out:
1589 if (check)
1590 ceph_check_caps(ci, 0, NULL);
1591 iput(inode);
1592 }
1593
1594
1595 /*
1596 * called by trunc_wq;
1597 *
1598 * We also truncate in a separate thread as well.
1599 */
1600 static void ceph_vmtruncate_work(struct work_struct *work)
1601 {
1602 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1603 i_vmtruncate_work);
1604 struct inode *inode = &ci->vfs_inode;
1605
1606 dout("vmtruncate_work %p\n", inode);
1607 __ceph_do_pending_vmtruncate(inode);
1608 iput(inode);
1609 }
1610
1611 /*
1612 * Queue an async vmtruncate. If we fail to queue work, we will handle
1613 * the truncation the next time we call __ceph_do_pending_vmtruncate.
1614 */
1615 void ceph_queue_vmtruncate(struct inode *inode)
1616 {
1617 struct ceph_inode_info *ci = ceph_inode(inode);
1618
1619 ihold(inode);
1620
1621 if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1622 &ci->i_vmtruncate_work)) {
1623 dout("ceph_queue_vmtruncate %p\n", inode);
1624 } else {
1625 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1626 inode, ci->i_truncate_pending);
1627 iput(inode);
1628 }
1629 }
1630
1631 /*
1632 * Make sure any pending truncation is applied before doing anything
1633 * that may depend on it.
1634 */
1635 void __ceph_do_pending_vmtruncate(struct inode *inode)
1636 {
1637 struct ceph_inode_info *ci = ceph_inode(inode);
1638 u64 to;
1639 int wrbuffer_refs, finish = 0;
1640
1641 mutex_lock(&ci->i_truncate_mutex);
1642 retry:
1643 spin_lock(&ci->i_ceph_lock);
1644 if (ci->i_truncate_pending == 0) {
1645 dout("__do_pending_vmtruncate %p none pending\n", inode);
1646 spin_unlock(&ci->i_ceph_lock);
1647 mutex_unlock(&ci->i_truncate_mutex);
1648 return;
1649 }
1650
1651 /*
1652 * make sure any dirty snapped pages are flushed before we
1653 * possibly truncate them.. so write AND block!
1654 */
1655 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1656 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1657 inode);
1658 spin_unlock(&ci->i_ceph_lock);
1659 filemap_write_and_wait_range(&inode->i_data, 0,
1660 inode->i_sb->s_maxbytes);
1661 goto retry;
1662 }
1663
1664 /* there should be no reader or writer */
1665 WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1666
1667 to = ci->i_truncate_size;
1668 wrbuffer_refs = ci->i_wrbuffer_ref;
1669 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1670 ci->i_truncate_pending, to);
1671 spin_unlock(&ci->i_ceph_lock);
1672
1673 truncate_pagecache(inode, to);
1674
1675 spin_lock(&ci->i_ceph_lock);
1676 if (to == ci->i_truncate_size) {
1677 ci->i_truncate_pending = 0;
1678 finish = 1;
1679 }
1680 spin_unlock(&ci->i_ceph_lock);
1681 if (!finish)
1682 goto retry;
1683
1684 mutex_unlock(&ci->i_truncate_mutex);
1685
1686 if (wrbuffer_refs == 0)
1687 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1688
1689 wake_up_all(&ci->i_cap_wq);
1690 }
1691
1692 /*
1693 * symlinks
1694 */
1695 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1696 {
1697 struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1698 nd_set_link(nd, ci->i_symlink);
1699 return NULL;
1700 }
1701
1702 static const struct inode_operations ceph_symlink_iops = {
1703 .readlink = generic_readlink,
1704 .follow_link = ceph_sym_follow_link,
1705 .setattr = ceph_setattr,
1706 .getattr = ceph_getattr,
1707 .setxattr = ceph_setxattr,
1708 .getxattr = ceph_getxattr,
1709 .listxattr = ceph_listxattr,
1710 .removexattr = ceph_removexattr,
1711 };
1712
1713 /*
1714 * setattr
1715 */
1716 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1717 {
1718 struct inode *inode = dentry->d_inode;
1719 struct ceph_inode_info *ci = ceph_inode(inode);
1720 const unsigned int ia_valid = attr->ia_valid;
1721 struct ceph_mds_request *req;
1722 struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1723 int issued;
1724 int release = 0, dirtied = 0;
1725 int mask = 0;
1726 int err = 0;
1727 int inode_dirty_flags = 0;
1728
1729 if (ceph_snap(inode) != CEPH_NOSNAP)
1730 return -EROFS;
1731
1732 err = inode_change_ok(inode, attr);
1733 if (err != 0)
1734 return err;
1735
1736 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1737 USE_AUTH_MDS);
1738 if (IS_ERR(req))
1739 return PTR_ERR(req);
1740
1741 spin_lock(&ci->i_ceph_lock);
1742 issued = __ceph_caps_issued(ci, NULL);
1743 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1744
1745 if (ia_valid & ATTR_UID) {
1746 dout("setattr %p uid %d -> %d\n", inode,
1747 from_kuid(&init_user_ns, inode->i_uid),
1748 from_kuid(&init_user_ns, attr->ia_uid));
1749 if (issued & CEPH_CAP_AUTH_EXCL) {
1750 inode->i_uid = attr->ia_uid;
1751 dirtied |= CEPH_CAP_AUTH_EXCL;
1752 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1753 !uid_eq(attr->ia_uid, inode->i_uid)) {
1754 req->r_args.setattr.uid = cpu_to_le32(
1755 from_kuid(&init_user_ns, attr->ia_uid));
1756 mask |= CEPH_SETATTR_UID;
1757 release |= CEPH_CAP_AUTH_SHARED;
1758 }
1759 }
1760 if (ia_valid & ATTR_GID) {
1761 dout("setattr %p gid %d -> %d\n", inode,
1762 from_kgid(&init_user_ns, inode->i_gid),
1763 from_kgid(&init_user_ns, attr->ia_gid));
1764 if (issued & CEPH_CAP_AUTH_EXCL) {
1765 inode->i_gid = attr->ia_gid;
1766 dirtied |= CEPH_CAP_AUTH_EXCL;
1767 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1768 !gid_eq(attr->ia_gid, inode->i_gid)) {
1769 req->r_args.setattr.gid = cpu_to_le32(
1770 from_kgid(&init_user_ns, attr->ia_gid));
1771 mask |= CEPH_SETATTR_GID;
1772 release |= CEPH_CAP_AUTH_SHARED;
1773 }
1774 }
1775 if (ia_valid & ATTR_MODE) {
1776 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1777 attr->ia_mode);
1778 if (issued & CEPH_CAP_AUTH_EXCL) {
1779 inode->i_mode = attr->ia_mode;
1780 dirtied |= CEPH_CAP_AUTH_EXCL;
1781 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1782 attr->ia_mode != inode->i_mode) {
1783 inode->i_mode = attr->ia_mode;
1784 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1785 mask |= CEPH_SETATTR_MODE;
1786 release |= CEPH_CAP_AUTH_SHARED;
1787 }
1788 }
1789
1790 if (ia_valid & ATTR_ATIME) {
1791 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1792 inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1793 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1794 if (issued & CEPH_CAP_FILE_EXCL) {
1795 ci->i_time_warp_seq++;
1796 inode->i_atime = attr->ia_atime;
1797 dirtied |= CEPH_CAP_FILE_EXCL;
1798 } else if ((issued & CEPH_CAP_FILE_WR) &&
1799 timespec_compare(&inode->i_atime,
1800 &attr->ia_atime) < 0) {
1801 inode->i_atime = attr->ia_atime;
1802 dirtied |= CEPH_CAP_FILE_WR;
1803 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1804 !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1805 ceph_encode_timespec(&req->r_args.setattr.atime,
1806 &attr->ia_atime);
1807 mask |= CEPH_SETATTR_ATIME;
1808 release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1809 CEPH_CAP_FILE_WR;
1810 }
1811 }
1812 if (ia_valid & ATTR_MTIME) {
1813 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1814 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1815 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1816 if (issued & CEPH_CAP_FILE_EXCL) {
1817 ci->i_time_warp_seq++;
1818 inode->i_mtime = attr->ia_mtime;
1819 dirtied |= CEPH_CAP_FILE_EXCL;
1820 } else if ((issued & CEPH_CAP_FILE_WR) &&
1821 timespec_compare(&inode->i_mtime,
1822 &attr->ia_mtime) < 0) {
1823 inode->i_mtime = attr->ia_mtime;
1824 dirtied |= CEPH_CAP_FILE_WR;
1825 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1826 !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1827 ceph_encode_timespec(&req->r_args.setattr.mtime,
1828 &attr->ia_mtime);
1829 mask |= CEPH_SETATTR_MTIME;
1830 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1831 CEPH_CAP_FILE_WR;
1832 }
1833 }
1834 if (ia_valid & ATTR_SIZE) {
1835 dout("setattr %p size %lld -> %lld\n", inode,
1836 inode->i_size, attr->ia_size);
1837 if ((issued & CEPH_CAP_FILE_EXCL) &&
1838 attr->ia_size > inode->i_size) {
1839 inode->i_size = attr->ia_size;
1840 inode->i_blocks =
1841 (attr->ia_size + (1 << 9) - 1) >> 9;
1842 inode->i_ctime = attr->ia_ctime;
1843 ci->i_reported_size = attr->ia_size;
1844 dirtied |= CEPH_CAP_FILE_EXCL;
1845 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1846 attr->ia_size != inode->i_size) {
1847 req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1848 req->r_args.setattr.old_size =
1849 cpu_to_le64(inode->i_size);
1850 mask |= CEPH_SETATTR_SIZE;
1851 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1852 CEPH_CAP_FILE_WR;
1853 }
1854 }
1855
1856 /* these do nothing */
1857 if (ia_valid & ATTR_CTIME) {
1858 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1859 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1860 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1861 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1862 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1863 only ? "ctime only" : "ignored");
1864 inode->i_ctime = attr->ia_ctime;
1865 if (only) {
1866 /*
1867 * if kernel wants to dirty ctime but nothing else,
1868 * we need to choose a cap to dirty under, or do
1869 * a almost-no-op setattr
1870 */
1871 if (issued & CEPH_CAP_AUTH_EXCL)
1872 dirtied |= CEPH_CAP_AUTH_EXCL;
1873 else if (issued & CEPH_CAP_FILE_EXCL)
1874 dirtied |= CEPH_CAP_FILE_EXCL;
1875 else if (issued & CEPH_CAP_XATTR_EXCL)
1876 dirtied |= CEPH_CAP_XATTR_EXCL;
1877 else
1878 mask |= CEPH_SETATTR_CTIME;
1879 }
1880 }
1881 if (ia_valid & ATTR_FILE)
1882 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1883
1884 if (dirtied) {
1885 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied);
1886 inode->i_ctime = CURRENT_TIME;
1887 }
1888
1889 release &= issued;
1890 spin_unlock(&ci->i_ceph_lock);
1891
1892 if (inode_dirty_flags)
1893 __mark_inode_dirty(inode, inode_dirty_flags);
1894
1895 if (ia_valid & ATTR_MODE) {
1896 err = posix_acl_chmod(inode, attr->ia_mode);
1897 if (err)
1898 goto out_put;
1899 }
1900
1901 if (mask) {
1902 req->r_inode = inode;
1903 ihold(inode);
1904 req->r_inode_drop = release;
1905 req->r_args.setattr.mask = cpu_to_le32(mask);
1906 req->r_num_caps = 1;
1907 err = ceph_mdsc_do_request(mdsc, NULL, req);
1908 }
1909 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1910 ceph_cap_string(dirtied), mask);
1911
1912 ceph_mdsc_put_request(req);
1913 if (mask & CEPH_SETATTR_SIZE)
1914 __ceph_do_pending_vmtruncate(inode);
1915 return err;
1916 out_put:
1917 ceph_mdsc_put_request(req);
1918 return err;
1919 }
1920
1921 /*
1922 * Verify that we have a lease on the given mask. If not,
1923 * do a getattr against an mds.
1924 */
1925 int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
1926 int mask, bool force)
1927 {
1928 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
1929 struct ceph_mds_client *mdsc = fsc->mdsc;
1930 struct ceph_mds_request *req;
1931 int err;
1932
1933 if (ceph_snap(inode) == CEPH_SNAPDIR) {
1934 dout("do_getattr inode %p SNAPDIR\n", inode);
1935 return 0;
1936 }
1937
1938 dout("do_getattr inode %p mask %s mode 0%o\n",
1939 inode, ceph_cap_string(mask), inode->i_mode);
1940 if (!force && ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1941 return 0;
1942
1943 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1944 if (IS_ERR(req))
1945 return PTR_ERR(req);
1946 req->r_inode = inode;
1947 ihold(inode);
1948 req->r_num_caps = 1;
1949 req->r_args.getattr.mask = cpu_to_le32(mask);
1950 req->r_locked_page = locked_page;
1951 err = ceph_mdsc_do_request(mdsc, NULL, req);
1952 if (locked_page && err == 0) {
1953 u64 inline_version = req->r_reply_info.targeti.inline_version;
1954 if (inline_version == 0) {
1955 /* the reply is supposed to contain inline data */
1956 err = -EINVAL;
1957 } else if (inline_version == CEPH_INLINE_NONE) {
1958 err = -ENODATA;
1959 } else {
1960 err = req->r_reply_info.targeti.inline_len;
1961 }
1962 }
1963 ceph_mdsc_put_request(req);
1964 dout("do_getattr result=%d\n", err);
1965 return err;
1966 }
1967
1968
1969 /*
1970 * Check inode permissions. We verify we have a valid value for
1971 * the AUTH cap, then call the generic handler.
1972 */
1973 int ceph_permission(struct inode *inode, int mask)
1974 {
1975 int err;
1976
1977 if (mask & MAY_NOT_BLOCK)
1978 return -ECHILD;
1979
1980 err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
1981
1982 if (!err)
1983 err = generic_permission(inode, mask);
1984 return err;
1985 }
1986
1987 /*
1988 * Get all attributes. Hopefully somedata we'll have a statlite()
1989 * and can limit the fields we require to be accurate.
1990 */
1991 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1992 struct kstat *stat)
1993 {
1994 struct inode *inode = dentry->d_inode;
1995 struct ceph_inode_info *ci = ceph_inode(inode);
1996 int err;
1997
1998 err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL, false);
1999 if (!err) {
2000 generic_fillattr(inode, stat);
2001 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
2002 if (ceph_snap(inode) != CEPH_NOSNAP)
2003 stat->dev = ceph_snap(inode);
2004 else
2005 stat->dev = 0;
2006 if (S_ISDIR(inode->i_mode)) {
2007 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
2008 RBYTES))
2009 stat->size = ci->i_rbytes;
2010 else
2011 stat->size = ci->i_files + ci->i_subdirs;
2012 stat->blocks = 0;
2013 stat->blksize = 65536;
2014 }
2015 }
2016 return err;
2017 }
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