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dmaengine: core: Skip mask matching when it is not provided to private_candidate
[linux-2.6/btrfs-unstable.git] / fs / ceph / inode.c
blob498dcfa2dcdbedf393ae26fc9f7f68cf90bceb90
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/writeback.h>
10 #include <linux/vmalloc.h>
11 #include <linux/posix_acl.h>
12 #include <linux/random.h>
13
14 #include "super.h"
15 #include "mds_client.h"
16 #include "cache.h"
17 #include <linux/ceph/decode.h>
18
19 /*
20 * Ceph inode operations
21 *
22 * Implement basic inode helpers (get, alloc) and inode ops (getattr,
23 * setattr, etc.), xattr helpers, and helpers for assimilating
24 * metadata returned by the MDS into our cache.
25 *
26 * Also define helpers for doing asynchronous writeback, invalidation,
27 * and truncation for the benefit of those who can't afford to block
28 * (typically because they are in the message handler path).
29 */
30
31 static const struct inode_operations ceph_symlink_iops;
32
33 static void ceph_invalidate_work(struct work_struct *work);
34 static void ceph_writeback_work(struct work_struct *work);
35 static void ceph_vmtruncate_work(struct work_struct *work);
36
37 /*
38 * find or create an inode, given the ceph ino number
39 */
40 static int ceph_set_ino_cb(struct inode *inode, void *data)
41 {
42 ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
43 inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
44 return 0;
45 }
46
47 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
48 {
49 struct inode *inode;
50 ino_t t = ceph_vino_to_ino(vino);
51
52 inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
53 if (inode == NULL)
54 return ERR_PTR(-ENOMEM);
55 if (inode->i_state & I_NEW) {
56 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
57 inode, ceph_vinop(inode), (u64)inode->i_ino);
58 unlock_new_inode(inode);
59 }
60
61 dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
62 vino.snap, inode);
63 return inode;
64 }
65
66 /*
67 * get/constuct snapdir inode for a given directory
68 */
69 struct inode *ceph_get_snapdir(struct inode *parent)
70 {
71 struct ceph_vino vino = {
72 .ino = ceph_ino(parent),
73 .snap = CEPH_SNAPDIR,
74 };
75 struct inode *inode = ceph_get_inode(parent->i_sb, vino);
76 struct ceph_inode_info *ci = ceph_inode(inode);
77
78 BUG_ON(!S_ISDIR(parent->i_mode));
79 if (IS_ERR(inode))
80 return inode;
81 inode->i_mode = parent->i_mode;
82 inode->i_uid = parent->i_uid;
83 inode->i_gid = parent->i_gid;
84 inode->i_op = &ceph_snapdir_iops;
85 inode->i_fop = &ceph_snapdir_fops;
86 ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
87 ci->i_rbytes = 0;
88 return inode;
89 }
90
91 const struct inode_operations ceph_file_iops = {
92 .permission = ceph_permission,
93 .setattr = ceph_setattr,
94 .getattr = ceph_getattr,
95 .setxattr = ceph_setxattr,
96 .getxattr = ceph_getxattr,
97 .listxattr = ceph_listxattr,
98 .removexattr = ceph_removexattr,
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 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
139 "frag %x\n", &ci->vfs_inode,
140 ceph_vinop(&ci->vfs_inode), f);
141 return ERR_PTR(-ENOMEM);
142 }
143 frag->frag = f;
144 frag->split_by = 0;
145 frag->mds = -1;
146 frag->ndist = 0;
147
148 rb_link_node(&frag->node, parent, p);
149 rb_insert_color(&frag->node, &ci->i_fragtree);
150
151 dout("get_or_create_frag added %llx.%llx frag %x\n",
152 ceph_vinop(&ci->vfs_inode), f);
153 return frag;
154 }
155
156 /*
157 * find a specific frag @f
158 */
159 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
160 {
161 struct rb_node *n = ci->i_fragtree.rb_node;
162
163 while (n) {
164 struct ceph_inode_frag *frag =
165 rb_entry(n, struct ceph_inode_frag, node);
166 int c = ceph_frag_compare(f, frag->frag);
167 if (c < 0)
168 n = n->rb_left;
169 else if (c > 0)
170 n = n->rb_right;
171 else
172 return frag;
173 }
174 return NULL;
175 }
176
177 /*
178 * Choose frag containing the given value @v. If @pfrag is
179 * specified, copy the frag delegation info to the caller if
180 * it is present.
181 */
182 static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
183 struct ceph_inode_frag *pfrag, int *found)
184 {
185 u32 t = ceph_frag_make(0, 0);
186 struct ceph_inode_frag *frag;
187 unsigned nway, i;
188 u32 n;
189
190 if (found)
191 *found = 0;
192
193 while (1) {
194 WARN_ON(!ceph_frag_contains_value(t, v));
195 frag = __ceph_find_frag(ci, t);
196 if (!frag)
197 break; /* t is a leaf */
198 if (frag->split_by == 0) {
199 if (pfrag)
200 memcpy(pfrag, frag, sizeof(*pfrag));
201 if (found)
202 *found = 1;
203 break;
204 }
205
206 /* choose child */
207 nway = 1 << frag->split_by;
208 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
209 frag->split_by, nway);
210 for (i = 0; i < nway; i++) {
211 n = ceph_frag_make_child(t, frag->split_by, i);
212 if (ceph_frag_contains_value(n, v)) {
213 t = n;
214 break;
215 }
216 }
217 BUG_ON(i == nway);
218 }
219 dout("choose_frag(%x) = %x\n", v, t);
220
221 return t;
222 }
223
224 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
225 struct ceph_inode_frag *pfrag, int *found)
226 {
227 u32 ret;
228 mutex_lock(&ci->i_fragtree_mutex);
229 ret = __ceph_choose_frag(ci, v, pfrag, found);
230 mutex_unlock(&ci->i_fragtree_mutex);
231 return ret;
232 }
233
234 /*
235 * Process dirfrag (delegation) info from the mds. Include leaf
236 * fragment in tree ONLY if ndist > 0. Otherwise, only
237 * branches/splits are included in i_fragtree)
238 */
239 static int ceph_fill_dirfrag(struct inode *inode,
240 struct ceph_mds_reply_dirfrag *dirinfo)
241 {
242 struct ceph_inode_info *ci = ceph_inode(inode);
243 struct ceph_inode_frag *frag;
244 u32 id = le32_to_cpu(dirinfo->frag);
245 int mds = le32_to_cpu(dirinfo->auth);
246 int ndist = le32_to_cpu(dirinfo->ndist);
247 int diri_auth = -1;
248 int i;
249 int err = 0;
250
251 spin_lock(&ci->i_ceph_lock);
252 if (ci->i_auth_cap)
253 diri_auth = ci->i_auth_cap->mds;
254 spin_unlock(&ci->i_ceph_lock);
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 ceph_fill_fragtree(struct inode *inode,
303 struct ceph_frag_tree_head *fragtree,
304 struct ceph_mds_reply_dirfrag *dirinfo)
305 {
306 struct ceph_inode_info *ci = ceph_inode(inode);
307 struct ceph_inode_frag *frag;
308 struct rb_node *rb_node;
309 int i;
310 u32 id, nsplits;
311 bool update = false;
312
313 mutex_lock(&ci->i_fragtree_mutex);
314 nsplits = le32_to_cpu(fragtree->nsplits);
315 if (nsplits) {
316 i = prandom_u32() % nsplits;
317 id = le32_to_cpu(fragtree->splits[i].frag);
318 if (!__ceph_find_frag(ci, id))
319 update = true;
320 } else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) {
321 rb_node = rb_first(&ci->i_fragtree);
322 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
323 if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node))
324 update = true;
325 }
326 if (!update && dirinfo) {
327 id = le32_to_cpu(dirinfo->frag);
328 if (id != __ceph_choose_frag(ci, id, NULL, NULL))
329 update = true;
330 }
331 if (!update)
332 goto out_unlock;
333
334 dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode));
335 rb_node = rb_first(&ci->i_fragtree);
336 for (i = 0; i < nsplits; i++) {
337 id = le32_to_cpu(fragtree->splits[i].frag);
338 frag = NULL;
339 while (rb_node) {
340 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
341 if (ceph_frag_compare(frag->frag, id) >= 0) {
342 if (frag->frag != id)
343 frag = NULL;
344 else
345 rb_node = rb_next(rb_node);
346 break;
347 }
348 rb_node = rb_next(rb_node);
349 rb_erase(&frag->node, &ci->i_fragtree);
350 kfree(frag);
351 frag = NULL;
352 }
353 if (!frag) {
354 frag = __get_or_create_frag(ci, id);
355 if (IS_ERR(frag))
356 continue;
357 }
358 frag->split_by = le32_to_cpu(fragtree->splits[i].by);
359 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
360 }
361 while (rb_node) {
362 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
363 rb_node = rb_next(rb_node);
364 rb_erase(&frag->node, &ci->i_fragtree);
365 kfree(frag);
366 }
367 out_unlock:
368 mutex_unlock(&ci->i_fragtree_mutex);
369 return 0;
370 }
371
372 /*
373 * initialize a newly allocated inode.
374 */
375 struct inode *ceph_alloc_inode(struct super_block *sb)
376 {
377 struct ceph_inode_info *ci;
378 int i;
379
380 ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
381 if (!ci)
382 return NULL;
383
384 dout("alloc_inode %p\n", &ci->vfs_inode);
385
386 spin_lock_init(&ci->i_ceph_lock);
387
388 ci->i_version = 0;
389 ci->i_inline_version = 0;
390 ci->i_time_warp_seq = 0;
391 ci->i_ceph_flags = 0;
392 atomic64_set(&ci->i_ordered_count, 1);
393 atomic64_set(&ci->i_release_count, 1);
394 atomic64_set(&ci->i_complete_seq[0], 0);
395 atomic64_set(&ci->i_complete_seq[1], 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_prealloc_cap_flush = NULL;
420 ci->i_cap_flush_tree = RB_ROOT;
421 init_waitqueue_head(&ci->i_cap_wq);
422 ci->i_hold_caps_min = 0;
423 ci->i_hold_caps_max = 0;
424 INIT_LIST_HEAD(&ci->i_cap_delay_list);
425 INIT_LIST_HEAD(&ci->i_cap_snaps);
426 ci->i_head_snapc = NULL;
427 ci->i_snap_caps = 0;
428
429 for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
430 ci->i_nr_by_mode[i] = 0;
431
432 mutex_init(&ci->i_truncate_mutex);
433 ci->i_truncate_seq = 0;
434 ci->i_truncate_size = 0;
435 ci->i_truncate_pending = 0;
436
437 ci->i_max_size = 0;
438 ci->i_reported_size = 0;
439 ci->i_wanted_max_size = 0;
440 ci->i_requested_max_size = 0;
441
442 ci->i_pin_ref = 0;
443 ci->i_rd_ref = 0;
444 ci->i_rdcache_ref = 0;
445 ci->i_wr_ref = 0;
446 ci->i_wb_ref = 0;
447 ci->i_wrbuffer_ref = 0;
448 ci->i_wrbuffer_ref_head = 0;
449 ci->i_shared_gen = 0;
450 ci->i_rdcache_gen = 0;
451 ci->i_rdcache_revoking = 0;
452
453 INIT_LIST_HEAD(&ci->i_unsafe_writes);
454 INIT_LIST_HEAD(&ci->i_unsafe_dirops);
455 INIT_LIST_HEAD(&ci->i_unsafe_iops);
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 if (ci->i_layout.fl_pg_pool != info->layout.fl_pg_pool)
757 ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
758 ci->i_layout = info->layout;
759
760 queue_trunc = ceph_fill_file_size(inode, issued,
761 le32_to_cpu(info->truncate_seq),
762 le64_to_cpu(info->truncate_size),
763 le64_to_cpu(info->size));
764 /* only update max_size on auth cap */
765 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
766 ci->i_max_size != le64_to_cpu(info->max_size)) {
767 dout("max_size %lld -> %llu\n", ci->i_max_size,
768 le64_to_cpu(info->max_size));
769 ci->i_max_size = le64_to_cpu(info->max_size);
770 }
771 }
772
773 /* xattrs */
774 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
775 if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL)) &&
776 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
777 if (ci->i_xattrs.blob)
778 ceph_buffer_put(ci->i_xattrs.blob);
779 ci->i_xattrs.blob = xattr_blob;
780 if (xattr_blob)
781 memcpy(ci->i_xattrs.blob->vec.iov_base,
782 iinfo->xattr_data, iinfo->xattr_len);
783 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
784 ceph_forget_all_cached_acls(inode);
785 xattr_blob = NULL;
786 }
787
788 inode->i_mapping->a_ops = &ceph_aops;
789
790 switch (inode->i_mode & S_IFMT) {
791 case S_IFIFO:
792 case S_IFBLK:
793 case S_IFCHR:
794 case S_IFSOCK:
795 init_special_inode(inode, inode->i_mode, inode->i_rdev);
796 inode->i_op = &ceph_file_iops;
797 break;
798 case S_IFREG:
799 inode->i_op = &ceph_file_iops;
800 inode->i_fop = &ceph_file_fops;
801 break;
802 case S_IFLNK:
803 inode->i_op = &ceph_symlink_iops;
804 if (!ci->i_symlink) {
805 u32 symlen = iinfo->symlink_len;
806 char *sym;
807
808 spin_unlock(&ci->i_ceph_lock);
809
810 err = -EINVAL;
811 if (WARN_ON(symlen != inode->i_size))
812 goto out;
813
814 err = -ENOMEM;
815 sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
816 if (!sym)
817 goto out;
818
819 spin_lock(&ci->i_ceph_lock);
820 if (!ci->i_symlink)
821 ci->i_symlink = sym;
822 else
823 kfree(sym); /* lost a race */
824 }
825 inode->i_link = ci->i_symlink;
826 break;
827 case S_IFDIR:
828 inode->i_op = &ceph_dir_iops;
829 inode->i_fop = &ceph_dir_fops;
830
831 ci->i_dir_layout = iinfo->dir_layout;
832
833 ci->i_files = le64_to_cpu(info->files);
834 ci->i_subdirs = le64_to_cpu(info->subdirs);
835 ci->i_rbytes = le64_to_cpu(info->rbytes);
836 ci->i_rfiles = le64_to_cpu(info->rfiles);
837 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
838 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
839 break;
840 default:
841 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
842 ceph_vinop(inode), inode->i_mode);
843 }
844
845 /* were we issued a capability? */
846 if (info->cap.caps) {
847 if (ceph_snap(inode) == CEPH_NOSNAP) {
848 unsigned caps = le32_to_cpu(info->cap.caps);
849 ceph_add_cap(inode, session,
850 le64_to_cpu(info->cap.cap_id),
851 cap_fmode, caps,
852 le32_to_cpu(info->cap.wanted),
853 le32_to_cpu(info->cap.seq),
854 le32_to_cpu(info->cap.mseq),
855 le64_to_cpu(info->cap.realm),
856 info->cap.flags, &new_cap);
857
858 /* set dir completion flag? */
859 if (S_ISDIR(inode->i_mode) &&
860 ci->i_files == 0 && ci->i_subdirs == 0 &&
861 (caps & CEPH_CAP_FILE_SHARED) &&
862 (issued & CEPH_CAP_FILE_EXCL) == 0 &&
863 !__ceph_dir_is_complete(ci)) {
864 dout(" marking %p complete (empty)\n", inode);
865 i_size_write(inode, 0);
866 __ceph_dir_set_complete(ci,
867 atomic64_read(&ci->i_release_count),
868 atomic64_read(&ci->i_ordered_count));
869 }
870
871 wake = true;
872 } else {
873 dout(" %p got snap_caps %s\n", inode,
874 ceph_cap_string(le32_to_cpu(info->cap.caps)));
875 ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
876 if (cap_fmode >= 0)
877 __ceph_get_fmode(ci, cap_fmode);
878 }
879 } else if (cap_fmode >= 0) {
880 pr_warn("mds issued no caps on %llx.%llx\n",
881 ceph_vinop(inode));
882 __ceph_get_fmode(ci, cap_fmode);
883 }
884
885 if (iinfo->inline_version > 0 &&
886 iinfo->inline_version >= ci->i_inline_version) {
887 int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
888 ci->i_inline_version = iinfo->inline_version;
889 if (ci->i_inline_version != CEPH_INLINE_NONE &&
890 (locked_page ||
891 (le32_to_cpu(info->cap.caps) & cache_caps)))
892 fill_inline = true;
893 }
894
895 spin_unlock(&ci->i_ceph_lock);
896
897 if (fill_inline)
898 ceph_fill_inline_data(inode, locked_page,
899 iinfo->inline_data, iinfo->inline_len);
900
901 if (wake)
902 wake_up_all(&ci->i_cap_wq);
903
904 /* queue truncate if we saw i_size decrease */
905 if (queue_trunc)
906 ceph_queue_vmtruncate(inode);
907
908 /* populate frag tree */
909 if (S_ISDIR(inode->i_mode))
910 ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
911
912 /* update delegation info? */
913 if (dirinfo)
914 ceph_fill_dirfrag(inode, dirinfo);
915
916 err = 0;
917 out:
918 if (new_cap)
919 ceph_put_cap(mdsc, new_cap);
920 if (xattr_blob)
921 ceph_buffer_put(xattr_blob);
922 return err;
923 }
924
925 /*
926 * caller should hold session s_mutex.
927 */
928 static void update_dentry_lease(struct dentry *dentry,
929 struct ceph_mds_reply_lease *lease,
930 struct ceph_mds_session *session,
931 unsigned long from_time)
932 {
933 struct ceph_dentry_info *di = ceph_dentry(dentry);
934 long unsigned duration = le32_to_cpu(lease->duration_ms);
935 long unsigned ttl = from_time + (duration * HZ) / 1000;
936 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
937 struct inode *dir;
938
939 /* only track leases on regular dentries */
940 if (dentry->d_op != &ceph_dentry_ops)
941 return;
942
943 spin_lock(&dentry->d_lock);
944 dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
945 dentry, duration, ttl);
946
947 /* make lease_rdcache_gen match directory */
948 dir = d_inode(dentry->d_parent);
949 di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
950
951 if (duration == 0)
952 goto out_unlock;
953
954 if (di->lease_gen == session->s_cap_gen &&
955 time_before(ttl, dentry->d_time))
956 goto out_unlock; /* we already have a newer lease. */
957
958 if (di->lease_session && di->lease_session != session)
959 goto out_unlock;
960
961 ceph_dentry_lru_touch(dentry);
962
963 if (!di->lease_session)
964 di->lease_session = ceph_get_mds_session(session);
965 di->lease_gen = session->s_cap_gen;
966 di->lease_seq = le32_to_cpu(lease->seq);
967 di->lease_renew_after = half_ttl;
968 di->lease_renew_from = 0;
969 dentry->d_time = ttl;
970 out_unlock:
971 spin_unlock(&dentry->d_lock);
972 return;
973 }
974
975 /*
976 * splice a dentry to an inode.
977 * caller must hold directory i_mutex for this to be safe.
978 *
979 * we will only rehash the resulting dentry if @prehash is
980 * true; @prehash will be set to false (for the benefit of
981 * the caller) if we fail.
982 */
983 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
984 bool *prehash)
985 {
986 struct dentry *realdn;
987
988 BUG_ON(d_inode(dn));
989
990 /* dn must be unhashed */
991 if (!d_unhashed(dn))
992 d_drop(dn);
993 realdn = d_splice_alias(in, dn);
994 if (IS_ERR(realdn)) {
995 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
996 PTR_ERR(realdn), dn, in, ceph_vinop(in));
997 if (prehash)
998 *prehash = false; /* don't rehash on error */
999 dn = realdn; /* note realdn contains the error */
1000 goto out;
1001 } else if (realdn) {
1002 dout("dn %p (%d) spliced with %p (%d) "
1003 "inode %p ino %llx.%llx\n",
1004 dn, d_count(dn),
1005 realdn, d_count(realdn),
1006 d_inode(realdn), ceph_vinop(d_inode(realdn)));
1007 dput(dn);
1008 dn = realdn;
1009 } else {
1010 BUG_ON(!ceph_dentry(dn));
1011 dout("dn %p attached to %p ino %llx.%llx\n",
1012 dn, d_inode(dn), ceph_vinop(d_inode(dn)));
1013 }
1014 if ((!prehash || *prehash) && d_unhashed(dn))
1015 d_rehash(dn);
1016 out:
1017 return dn;
1018 }
1019
1020 /*
1021 * Incorporate results into the local cache. This is either just
1022 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1023 * after a lookup).
1024 *
1025 * A reply may contain
1026 * a directory inode along with a dentry.
1027 * and/or a target inode
1028 *
1029 * Called with snap_rwsem (read).
1030 */
1031 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
1032 struct ceph_mds_session *session)
1033 {
1034 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1035 struct inode *in = NULL;
1036 struct ceph_vino vino;
1037 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1038 int err = 0;
1039
1040 dout("fill_trace %p is_dentry %d is_target %d\n", req,
1041 rinfo->head->is_dentry, rinfo->head->is_target);
1042
1043 #if 0
1044 /*
1045 * Debugging hook:
1046 *
1047 * If we resend completed ops to a recovering mds, we get no
1048 * trace. Since that is very rare, pretend this is the case
1049 * to ensure the 'no trace' handlers in the callers behave.
1050 *
1051 * Fill in inodes unconditionally to avoid breaking cap
1052 * invariants.
1053 */
1054 if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
1055 pr_info("fill_trace faking empty trace on %lld %s\n",
1056 req->r_tid, ceph_mds_op_name(rinfo->head->op));
1057 if (rinfo->head->is_dentry) {
1058 rinfo->head->is_dentry = 0;
1059 err = fill_inode(req->r_locked_dir,
1060 &rinfo->diri, rinfo->dirfrag,
1061 session, req->r_request_started, -1);
1062 }
1063 if (rinfo->head->is_target) {
1064 rinfo->head->is_target = 0;
1065 ininfo = rinfo->targeti.in;
1066 vino.ino = le64_to_cpu(ininfo->ino);
1067 vino.snap = le64_to_cpu(ininfo->snapid);
1068 in = ceph_get_inode(sb, vino);
1069 err = fill_inode(in, &rinfo->targeti, NULL,
1070 session, req->r_request_started,
1071 req->r_fmode);
1072 iput(in);
1073 }
1074 }
1075 #endif
1076
1077 if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1078 dout("fill_trace reply is empty!\n");
1079 if (rinfo->head->result == 0 && req->r_locked_dir)
1080 ceph_invalidate_dir_request(req);
1081 return 0;
1082 }
1083
1084 if (rinfo->head->is_dentry) {
1085 struct inode *dir = req->r_locked_dir;
1086
1087 if (dir) {
1088 err = fill_inode(dir, NULL,
1089 &rinfo->diri, rinfo->dirfrag,
1090 session, req->r_request_started, -1,
1091 &req->r_caps_reservation);
1092 if (err < 0)
1093 goto done;
1094 } else {
1095 WARN_ON_ONCE(1);
1096 }
1097
1098 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME) {
1099 struct qstr dname;
1100 struct dentry *dn, *parent;
1101
1102 BUG_ON(!rinfo->head->is_target);
1103 BUG_ON(req->r_dentry);
1104
1105 parent = d_find_any_alias(dir);
1106 BUG_ON(!parent);
1107
1108 dname.name = rinfo->dname;
1109 dname.len = rinfo->dname_len;
1110 dname.hash = full_name_hash(dname.name, dname.len);
1111 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1112 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1113 retry_lookup:
1114 dn = d_lookup(parent, &dname);
1115 dout("d_lookup on parent=%p name=%.*s got %p\n",
1116 parent, dname.len, dname.name, dn);
1117
1118 if (!dn) {
1119 dn = d_alloc(parent, &dname);
1120 dout("d_alloc %p '%.*s' = %p\n", parent,
1121 dname.len, dname.name, dn);
1122 if (dn == NULL) {
1123 dput(parent);
1124 err = -ENOMEM;
1125 goto done;
1126 }
1127 err = ceph_init_dentry(dn);
1128 if (err < 0) {
1129 dput(dn);
1130 dput(parent);
1131 goto done;
1132 }
1133 } else if (d_really_is_positive(dn) &&
1134 (ceph_ino(d_inode(dn)) != vino.ino ||
1135 ceph_snap(d_inode(dn)) != vino.snap)) {
1136 dout(" dn %p points to wrong inode %p\n",
1137 dn, d_inode(dn));
1138 d_delete(dn);
1139 dput(dn);
1140 goto retry_lookup;
1141 }
1142
1143 req->r_dentry = dn;
1144 dput(parent);
1145 }
1146 }
1147
1148 if (rinfo->head->is_target) {
1149 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1150 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1151
1152 in = ceph_get_inode(sb, vino);
1153 if (IS_ERR(in)) {
1154 err = PTR_ERR(in);
1155 goto done;
1156 }
1157 req->r_target_inode = in;
1158
1159 err = fill_inode(in, req->r_locked_page, &rinfo->targeti, NULL,
1160 session, req->r_request_started,
1161 (!req->r_aborted && rinfo->head->result == 0) ?
1162 req->r_fmode : -1,
1163 &req->r_caps_reservation);
1164 if (err < 0) {
1165 pr_err("fill_inode badness %p %llx.%llx\n",
1166 in, ceph_vinop(in));
1167 goto done;
1168 }
1169 }
1170
1171 /*
1172 * ignore null lease/binding on snapdir ENOENT, or else we
1173 * will have trouble splicing in the virtual snapdir later
1174 */
1175 if (rinfo->head->is_dentry && !req->r_aborted &&
1176 req->r_locked_dir &&
1177 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1178 fsc->mount_options->snapdir_name,
1179 req->r_dentry->d_name.len))) {
1180 /*
1181 * lookup link rename : null -> possibly existing inode
1182 * mknod symlink mkdir : null -> new inode
1183 * unlink : linked -> null
1184 */
1185 struct inode *dir = req->r_locked_dir;
1186 struct dentry *dn = req->r_dentry;
1187 bool have_dir_cap, have_lease;
1188
1189 BUG_ON(!dn);
1190 BUG_ON(!dir);
1191 BUG_ON(d_inode(dn->d_parent) != dir);
1192 BUG_ON(ceph_ino(dir) !=
1193 le64_to_cpu(rinfo->diri.in->ino));
1194 BUG_ON(ceph_snap(dir) !=
1195 le64_to_cpu(rinfo->diri.in->snapid));
1196
1197 /* do we have a lease on the whole dir? */
1198 have_dir_cap =
1199 (le32_to_cpu(rinfo->diri.in->cap.caps) &
1200 CEPH_CAP_FILE_SHARED);
1201
1202 /* do we have a dn lease? */
1203 have_lease = have_dir_cap ||
1204 le32_to_cpu(rinfo->dlease->duration_ms);
1205 if (!have_lease)
1206 dout("fill_trace no dentry lease or dir cap\n");
1207
1208 /* rename? */
1209 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1210 struct inode *olddir = req->r_old_dentry_dir;
1211 BUG_ON(!olddir);
1212
1213 dout(" src %p '%pd' dst %p '%pd'\n",
1214 req->r_old_dentry,
1215 req->r_old_dentry,
1216 dn, dn);
1217 dout("fill_trace doing d_move %p -> %p\n",
1218 req->r_old_dentry, dn);
1219
1220 /* d_move screws up sibling dentries' offsets */
1221 ceph_dir_clear_ordered(dir);
1222 ceph_dir_clear_ordered(olddir);
1223
1224 d_move(req->r_old_dentry, dn);
1225 dout(" src %p '%pd' dst %p '%pd'\n",
1226 req->r_old_dentry,
1227 req->r_old_dentry,
1228 dn, dn);
1229
1230 /* ensure target dentry is invalidated, despite
1231 rehashing bug in vfs_rename_dir */
1232 ceph_invalidate_dentry_lease(dn);
1233
1234 dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1235 ceph_dentry(req->r_old_dentry)->offset);
1236
1237 dn = req->r_old_dentry; /* use old_dentry */
1238 }
1239
1240 /* null dentry? */
1241 if (!rinfo->head->is_target) {
1242 dout("fill_trace null dentry\n");
1243 if (d_really_is_positive(dn)) {
1244 ceph_dir_clear_ordered(dir);
1245 dout("d_delete %p\n", dn);
1246 d_delete(dn);
1247 } else {
1248 dout("d_instantiate %p NULL\n", dn);
1249 d_instantiate(dn, NULL);
1250 if (have_lease && d_unhashed(dn))
1251 d_rehash(dn);
1252 update_dentry_lease(dn, rinfo->dlease,
1253 session,
1254 req->r_request_started);
1255 }
1256 goto done;
1257 }
1258
1259 /* attach proper inode */
1260 if (d_really_is_negative(dn)) {
1261 ceph_dir_clear_ordered(dir);
1262 ihold(in);
1263 dn = splice_dentry(dn, in, &have_lease);
1264 if (IS_ERR(dn)) {
1265 err = PTR_ERR(dn);
1266 goto done;
1267 }
1268 req->r_dentry = dn; /* may have spliced */
1269 } else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1270 dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1271 dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1272 ceph_vinop(in));
1273 have_lease = false;
1274 }
1275
1276 if (have_lease)
1277 update_dentry_lease(dn, rinfo->dlease, session,
1278 req->r_request_started);
1279 dout(" final dn %p\n", dn);
1280 } else if (!req->r_aborted &&
1281 (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1282 req->r_op == CEPH_MDS_OP_MKSNAP)) {
1283 struct dentry *dn = req->r_dentry;
1284 struct inode *dir = req->r_locked_dir;
1285
1286 /* fill out a snapdir LOOKUPSNAP dentry */
1287 BUG_ON(!dn);
1288 BUG_ON(!dir);
1289 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1290 dout(" linking snapped dir %p to dn %p\n", in, dn);
1291 ceph_dir_clear_ordered(dir);
1292 ihold(in);
1293 dn = splice_dentry(dn, in, NULL);
1294 if (IS_ERR(dn)) {
1295 err = PTR_ERR(dn);
1296 goto done;
1297 }
1298 req->r_dentry = dn; /* may have spliced */
1299 }
1300 done:
1301 dout("fill_trace done err=%d\n", err);
1302 return err;
1303 }
1304
1305 /*
1306 * Prepopulate our cache with readdir results, leases, etc.
1307 */
1308 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1309 struct ceph_mds_session *session)
1310 {
1311 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1312 int i, err = 0;
1313
1314 for (i = 0; i < rinfo->dir_nr; i++) {
1315 struct ceph_vino vino;
1316 struct inode *in;
1317 int rc;
1318
1319 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1320 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1321
1322 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1323 if (IS_ERR(in)) {
1324 err = PTR_ERR(in);
1325 dout("new_inode badness got %d\n", err);
1326 continue;
1327 }
1328 rc = fill_inode(in, NULL, &rinfo->dir_in[i], NULL, session,
1329 req->r_request_started, -1,
1330 &req->r_caps_reservation);
1331 if (rc < 0) {
1332 pr_err("fill_inode badness on %p got %d\n", in, rc);
1333 err = rc;
1334 continue;
1335 }
1336 }
1337
1338 return err;
1339 }
1340
1341 void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1342 {
1343 if (ctl->page) {
1344 kunmap(ctl->page);
1345 page_cache_release(ctl->page);
1346 ctl->page = NULL;
1347 }
1348 }
1349
1350 static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1351 struct ceph_readdir_cache_control *ctl,
1352 struct ceph_mds_request *req)
1353 {
1354 struct ceph_inode_info *ci = ceph_inode(dir);
1355 unsigned nsize = PAGE_CACHE_SIZE / sizeof(struct dentry*);
1356 unsigned idx = ctl->index % nsize;
1357 pgoff_t pgoff = ctl->index / nsize;
1358
1359 if (!ctl->page || pgoff != page_index(ctl->page)) {
1360 ceph_readdir_cache_release(ctl);
1361 ctl->page = grab_cache_page(&dir->i_data, pgoff);
1362 if (!ctl->page) {
1363 ctl->index = -1;
1364 return -ENOMEM;
1365 }
1366 /* reading/filling the cache are serialized by
1367 * i_mutex, no need to use page lock */
1368 unlock_page(ctl->page);
1369 ctl->dentries = kmap(ctl->page);
1370 }
1371
1372 if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1373 req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1374 dout("readdir cache dn %p idx %d\n", dn, ctl->index);
1375 ctl->dentries[idx] = dn;
1376 ctl->index++;
1377 } else {
1378 dout("disable readdir cache\n");
1379 ctl->index = -1;
1380 }
1381 return 0;
1382 }
1383
1384 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1385 struct ceph_mds_session *session)
1386 {
1387 struct dentry *parent = req->r_dentry;
1388 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1389 struct qstr dname;
1390 struct dentry *dn;
1391 struct inode *in;
1392 int err = 0, ret, i;
1393 struct inode *snapdir = NULL;
1394 struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1395 struct ceph_dentry_info *di;
1396 u32 frag = le32_to_cpu(rhead->args.readdir.frag);
1397 struct ceph_readdir_cache_control cache_ctl = {};
1398
1399 if (req->r_aborted)
1400 return readdir_prepopulate_inodes_only(req, session);
1401
1402 if (rinfo->dir_dir &&
1403 le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1404 dout("readdir_prepopulate got new frag %x -> %x\n",
1405 frag, le32_to_cpu(rinfo->dir_dir->frag));
1406 frag = le32_to_cpu(rinfo->dir_dir->frag);
1407 if (ceph_frag_is_leftmost(frag))
1408 req->r_readdir_offset = 2;
1409 else
1410 req->r_readdir_offset = 0;
1411 }
1412
1413 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1414 snapdir = ceph_get_snapdir(d_inode(parent));
1415 parent = d_find_alias(snapdir);
1416 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1417 rinfo->dir_nr, parent);
1418 } else {
1419 dout("readdir_prepopulate %d items under dn %p\n",
1420 rinfo->dir_nr, parent);
1421 if (rinfo->dir_dir)
1422 ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1423 }
1424
1425 if (ceph_frag_is_leftmost(frag) && req->r_readdir_offset == 2) {
1426 /* note dir version at start of readdir so we can tell
1427 * if any dentries get dropped */
1428 struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
1429 req->r_dir_release_cnt = atomic64_read(&ci->i_release_count);
1430 req->r_dir_ordered_cnt = atomic64_read(&ci->i_ordered_count);
1431 req->r_readdir_cache_idx = 0;
1432 }
1433
1434 cache_ctl.index = req->r_readdir_cache_idx;
1435
1436 /* FIXME: release caps/leases if error occurs */
1437 for (i = 0; i < rinfo->dir_nr; i++) {
1438 struct ceph_vino vino;
1439
1440 dname.name = rinfo->dir_dname[i];
1441 dname.len = rinfo->dir_dname_len[i];
1442 dname.hash = full_name_hash(dname.name, dname.len);
1443
1444 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1445 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1446
1447 retry_lookup:
1448 dn = d_lookup(parent, &dname);
1449 dout("d_lookup on parent=%p name=%.*s got %p\n",
1450 parent, dname.len, dname.name, dn);
1451
1452 if (!dn) {
1453 dn = d_alloc(parent, &dname);
1454 dout("d_alloc %p '%.*s' = %p\n", parent,
1455 dname.len, dname.name, dn);
1456 if (dn == NULL) {
1457 dout("d_alloc badness\n");
1458 err = -ENOMEM;
1459 goto out;
1460 }
1461 ret = ceph_init_dentry(dn);
1462 if (ret < 0) {
1463 dput(dn);
1464 err = ret;
1465 goto out;
1466 }
1467 } else if (d_really_is_positive(dn) &&
1468 (ceph_ino(d_inode(dn)) != vino.ino ||
1469 ceph_snap(d_inode(dn)) != vino.snap)) {
1470 dout(" dn %p points to wrong inode %p\n",
1471 dn, d_inode(dn));
1472 d_delete(dn);
1473 dput(dn);
1474 goto retry_lookup;
1475 }
1476
1477 /* inode */
1478 if (d_really_is_positive(dn)) {
1479 in = d_inode(dn);
1480 } else {
1481 in = ceph_get_inode(parent->d_sb, vino);
1482 if (IS_ERR(in)) {
1483 dout("new_inode badness\n");
1484 d_drop(dn);
1485 dput(dn);
1486 err = PTR_ERR(in);
1487 goto out;
1488 }
1489 }
1490
1491 ret = fill_inode(in, NULL, &rinfo->dir_in[i], NULL, session,
1492 req->r_request_started, -1,
1493 &req->r_caps_reservation);
1494 if (ret < 0) {
1495 pr_err("fill_inode badness on %p\n", in);
1496 if (d_really_is_negative(dn))
1497 iput(in);
1498 d_drop(dn);
1499 err = ret;
1500 goto next_item;
1501 }
1502
1503 if (d_really_is_negative(dn)) {
1504 struct dentry *realdn = splice_dentry(dn, in, NULL);
1505 if (IS_ERR(realdn)) {
1506 err = PTR_ERR(realdn);
1507 d_drop(dn);
1508 dn = NULL;
1509 goto next_item;
1510 }
1511 dn = realdn;
1512 }
1513
1514 di = dn->d_fsdata;
1515 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1516
1517 update_dentry_lease(dn, rinfo->dir_dlease[i],
1518 req->r_session,
1519 req->r_request_started);
1520
1521 if (err == 0 && cache_ctl.index >= 0) {
1522 ret = fill_readdir_cache(d_inode(parent), dn,
1523 &cache_ctl, req);
1524 if (ret < 0)
1525 err = ret;
1526 }
1527 next_item:
1528 if (dn)
1529 dput(dn);
1530 }
1531 out:
1532 if (err == 0) {
1533 req->r_did_prepopulate = true;
1534 req->r_readdir_cache_idx = cache_ctl.index;
1535 }
1536 ceph_readdir_cache_release(&cache_ctl);
1537 if (snapdir) {
1538 iput(snapdir);
1539 dput(parent);
1540 }
1541 dout("readdir_prepopulate done\n");
1542 return err;
1543 }
1544
1545 int ceph_inode_set_size(struct inode *inode, loff_t size)
1546 {
1547 struct ceph_inode_info *ci = ceph_inode(inode);
1548 int ret = 0;
1549
1550 spin_lock(&ci->i_ceph_lock);
1551 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1552 inode->i_size = size;
1553 inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1554
1555 /* tell the MDS if we are approaching max_size */
1556 if ((size << 1) >= ci->i_max_size &&
1557 (ci->i_reported_size << 1) < ci->i_max_size)
1558 ret = 1;
1559
1560 spin_unlock(&ci->i_ceph_lock);
1561 return ret;
1562 }
1563
1564 /*
1565 * Write back inode data in a worker thread. (This can't be done
1566 * in the message handler context.)
1567 */
1568 void ceph_queue_writeback(struct inode *inode)
1569 {
1570 ihold(inode);
1571 if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1572 &ceph_inode(inode)->i_wb_work)) {
1573 dout("ceph_queue_writeback %p\n", inode);
1574 } else {
1575 dout("ceph_queue_writeback %p failed\n", inode);
1576 iput(inode);
1577 }
1578 }
1579
1580 static void ceph_writeback_work(struct work_struct *work)
1581 {
1582 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1583 i_wb_work);
1584 struct inode *inode = &ci->vfs_inode;
1585
1586 dout("writeback %p\n", inode);
1587 filemap_fdatawrite(&inode->i_data);
1588 iput(inode);
1589 }
1590
1591 /*
1592 * queue an async invalidation
1593 */
1594 void ceph_queue_invalidate(struct inode *inode)
1595 {
1596 ihold(inode);
1597 if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1598 &ceph_inode(inode)->i_pg_inv_work)) {
1599 dout("ceph_queue_invalidate %p\n", inode);
1600 } else {
1601 dout("ceph_queue_invalidate %p failed\n", inode);
1602 iput(inode);
1603 }
1604 }
1605
1606 /*
1607 * Invalidate inode pages in a worker thread. (This can't be done
1608 * in the message handler context.)
1609 */
1610 static void ceph_invalidate_work(struct work_struct *work)
1611 {
1612 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1613 i_pg_inv_work);
1614 struct inode *inode = &ci->vfs_inode;
1615 u32 orig_gen;
1616 int check = 0;
1617
1618 mutex_lock(&ci->i_truncate_mutex);
1619 spin_lock(&ci->i_ceph_lock);
1620 dout("invalidate_pages %p gen %d revoking %d\n", inode,
1621 ci->i_rdcache_gen, ci->i_rdcache_revoking);
1622 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1623 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1624 check = 1;
1625 spin_unlock(&ci->i_ceph_lock);
1626 mutex_unlock(&ci->i_truncate_mutex);
1627 goto out;
1628 }
1629 orig_gen = ci->i_rdcache_gen;
1630 spin_unlock(&ci->i_ceph_lock);
1631
1632 truncate_pagecache(inode, 0);
1633
1634 spin_lock(&ci->i_ceph_lock);
1635 if (orig_gen == ci->i_rdcache_gen &&
1636 orig_gen == ci->i_rdcache_revoking) {
1637 dout("invalidate_pages %p gen %d successful\n", inode,
1638 ci->i_rdcache_gen);
1639 ci->i_rdcache_revoking--;
1640 check = 1;
1641 } else {
1642 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1643 inode, orig_gen, ci->i_rdcache_gen,
1644 ci->i_rdcache_revoking);
1645 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1646 check = 1;
1647 }
1648 spin_unlock(&ci->i_ceph_lock);
1649 mutex_unlock(&ci->i_truncate_mutex);
1650 out:
1651 if (check)
1652 ceph_check_caps(ci, 0, NULL);
1653 iput(inode);
1654 }
1655
1656
1657 /*
1658 * called by trunc_wq;
1659 *
1660 * We also truncate in a separate thread as well.
1661 */
1662 static void ceph_vmtruncate_work(struct work_struct *work)
1663 {
1664 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1665 i_vmtruncate_work);
1666 struct inode *inode = &ci->vfs_inode;
1667
1668 dout("vmtruncate_work %p\n", inode);
1669 __ceph_do_pending_vmtruncate(inode);
1670 iput(inode);
1671 }
1672
1673 /*
1674 * Queue an async vmtruncate. If we fail to queue work, we will handle
1675 * the truncation the next time we call __ceph_do_pending_vmtruncate.
1676 */
1677 void ceph_queue_vmtruncate(struct inode *inode)
1678 {
1679 struct ceph_inode_info *ci = ceph_inode(inode);
1680
1681 ihold(inode);
1682
1683 if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1684 &ci->i_vmtruncate_work)) {
1685 dout("ceph_queue_vmtruncate %p\n", inode);
1686 } else {
1687 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1688 inode, ci->i_truncate_pending);
1689 iput(inode);
1690 }
1691 }
1692
1693 /*
1694 * Make sure any pending truncation is applied before doing anything
1695 * that may depend on it.
1696 */
1697 void __ceph_do_pending_vmtruncate(struct inode *inode)
1698 {
1699 struct ceph_inode_info *ci = ceph_inode(inode);
1700 u64 to;
1701 int wrbuffer_refs, finish = 0;
1702
1703 mutex_lock(&ci->i_truncate_mutex);
1704 retry:
1705 spin_lock(&ci->i_ceph_lock);
1706 if (ci->i_truncate_pending == 0) {
1707 dout("__do_pending_vmtruncate %p none pending\n", inode);
1708 spin_unlock(&ci->i_ceph_lock);
1709 mutex_unlock(&ci->i_truncate_mutex);
1710 return;
1711 }
1712
1713 /*
1714 * make sure any dirty snapped pages are flushed before we
1715 * possibly truncate them.. so write AND block!
1716 */
1717 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1718 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1719 inode);
1720 spin_unlock(&ci->i_ceph_lock);
1721 filemap_write_and_wait_range(&inode->i_data, 0,
1722 inode->i_sb->s_maxbytes);
1723 goto retry;
1724 }
1725
1726 /* there should be no reader or writer */
1727 WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1728
1729 to = ci->i_truncate_size;
1730 wrbuffer_refs = ci->i_wrbuffer_ref;
1731 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1732 ci->i_truncate_pending, to);
1733 spin_unlock(&ci->i_ceph_lock);
1734
1735 truncate_pagecache(inode, to);
1736
1737 spin_lock(&ci->i_ceph_lock);
1738 if (to == ci->i_truncate_size) {
1739 ci->i_truncate_pending = 0;
1740 finish = 1;
1741 }
1742 spin_unlock(&ci->i_ceph_lock);
1743 if (!finish)
1744 goto retry;
1745
1746 mutex_unlock(&ci->i_truncate_mutex);
1747
1748 if (wrbuffer_refs == 0)
1749 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1750
1751 wake_up_all(&ci->i_cap_wq);
1752 }
1753
1754 /*
1755 * symlinks
1756 */
1757 static const struct inode_operations ceph_symlink_iops = {
1758 .readlink = generic_readlink,
1759 .follow_link = simple_follow_link,
1760 .setattr = ceph_setattr,
1761 .getattr = ceph_getattr,
1762 .setxattr = ceph_setxattr,
1763 .getxattr = ceph_getxattr,
1764 .listxattr = ceph_listxattr,
1765 .removexattr = ceph_removexattr,
1766 };
1767
1768 /*
1769 * setattr
1770 */
1771 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1772 {
1773 struct inode *inode = d_inode(dentry);
1774 struct ceph_inode_info *ci = ceph_inode(inode);
1775 const unsigned int ia_valid = attr->ia_valid;
1776 struct ceph_mds_request *req;
1777 struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1778 struct ceph_cap_flush *prealloc_cf;
1779 int issued;
1780 int release = 0, dirtied = 0;
1781 int mask = 0;
1782 int err = 0;
1783 int inode_dirty_flags = 0;
1784 bool lock_snap_rwsem = false;
1785
1786 if (ceph_snap(inode) != CEPH_NOSNAP)
1787 return -EROFS;
1788
1789 err = inode_change_ok(inode, attr);
1790 if (err != 0)
1791 return err;
1792
1793 prealloc_cf = ceph_alloc_cap_flush();
1794 if (!prealloc_cf)
1795 return -ENOMEM;
1796
1797 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1798 USE_AUTH_MDS);
1799 if (IS_ERR(req)) {
1800 ceph_free_cap_flush(prealloc_cf);
1801 return PTR_ERR(req);
1802 }
1803
1804 spin_lock(&ci->i_ceph_lock);
1805 issued = __ceph_caps_issued(ci, NULL);
1806
1807 if (!ci->i_head_snapc &&
1808 (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
1809 lock_snap_rwsem = true;
1810 if (!down_read_trylock(&mdsc->snap_rwsem)) {
1811 spin_unlock(&ci->i_ceph_lock);
1812 down_read(&mdsc->snap_rwsem);
1813 spin_lock(&ci->i_ceph_lock);
1814 issued = __ceph_caps_issued(ci, NULL);
1815 }
1816 }
1817
1818 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1819
1820 if (ia_valid & ATTR_UID) {
1821 dout("setattr %p uid %d -> %d\n", inode,
1822 from_kuid(&init_user_ns, inode->i_uid),
1823 from_kuid(&init_user_ns, attr->ia_uid));
1824 if (issued & CEPH_CAP_AUTH_EXCL) {
1825 inode->i_uid = attr->ia_uid;
1826 dirtied |= CEPH_CAP_AUTH_EXCL;
1827 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1828 !uid_eq(attr->ia_uid, inode->i_uid)) {
1829 req->r_args.setattr.uid = cpu_to_le32(
1830 from_kuid(&init_user_ns, attr->ia_uid));
1831 mask |= CEPH_SETATTR_UID;
1832 release |= CEPH_CAP_AUTH_SHARED;
1833 }
1834 }
1835 if (ia_valid & ATTR_GID) {
1836 dout("setattr %p gid %d -> %d\n", inode,
1837 from_kgid(&init_user_ns, inode->i_gid),
1838 from_kgid(&init_user_ns, attr->ia_gid));
1839 if (issued & CEPH_CAP_AUTH_EXCL) {
1840 inode->i_gid = attr->ia_gid;
1841 dirtied |= CEPH_CAP_AUTH_EXCL;
1842 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1843 !gid_eq(attr->ia_gid, inode->i_gid)) {
1844 req->r_args.setattr.gid = cpu_to_le32(
1845 from_kgid(&init_user_ns, attr->ia_gid));
1846 mask |= CEPH_SETATTR_GID;
1847 release |= CEPH_CAP_AUTH_SHARED;
1848 }
1849 }
1850 if (ia_valid & ATTR_MODE) {
1851 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1852 attr->ia_mode);
1853 if (issued & CEPH_CAP_AUTH_EXCL) {
1854 inode->i_mode = attr->ia_mode;
1855 dirtied |= CEPH_CAP_AUTH_EXCL;
1856 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1857 attr->ia_mode != inode->i_mode) {
1858 inode->i_mode = attr->ia_mode;
1859 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1860 mask |= CEPH_SETATTR_MODE;
1861 release |= CEPH_CAP_AUTH_SHARED;
1862 }
1863 }
1864
1865 if (ia_valid & ATTR_ATIME) {
1866 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1867 inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1868 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1869 if (issued & CEPH_CAP_FILE_EXCL) {
1870 ci->i_time_warp_seq++;
1871 inode->i_atime = attr->ia_atime;
1872 dirtied |= CEPH_CAP_FILE_EXCL;
1873 } else if ((issued & CEPH_CAP_FILE_WR) &&
1874 timespec_compare(&inode->i_atime,
1875 &attr->ia_atime) < 0) {
1876 inode->i_atime = attr->ia_atime;
1877 dirtied |= CEPH_CAP_FILE_WR;
1878 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1879 !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1880 ceph_encode_timespec(&req->r_args.setattr.atime,
1881 &attr->ia_atime);
1882 mask |= CEPH_SETATTR_ATIME;
1883 release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1884 CEPH_CAP_FILE_WR;
1885 }
1886 }
1887 if (ia_valid & ATTR_MTIME) {
1888 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1889 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1890 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1891 if (issued & CEPH_CAP_FILE_EXCL) {
1892 ci->i_time_warp_seq++;
1893 inode->i_mtime = attr->ia_mtime;
1894 dirtied |= CEPH_CAP_FILE_EXCL;
1895 } else if ((issued & CEPH_CAP_FILE_WR) &&
1896 timespec_compare(&inode->i_mtime,
1897 &attr->ia_mtime) < 0) {
1898 inode->i_mtime = attr->ia_mtime;
1899 dirtied |= CEPH_CAP_FILE_WR;
1900 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1901 !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1902 ceph_encode_timespec(&req->r_args.setattr.mtime,
1903 &attr->ia_mtime);
1904 mask |= CEPH_SETATTR_MTIME;
1905 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1906 CEPH_CAP_FILE_WR;
1907 }
1908 }
1909 if (ia_valid & ATTR_SIZE) {
1910 dout("setattr %p size %lld -> %lld\n", inode,
1911 inode->i_size, attr->ia_size);
1912 if ((issued & CEPH_CAP_FILE_EXCL) &&
1913 attr->ia_size > inode->i_size) {
1914 inode->i_size = attr->ia_size;
1915 inode->i_blocks =
1916 (attr->ia_size + (1 << 9) - 1) >> 9;
1917 inode->i_ctime = attr->ia_ctime;
1918 ci->i_reported_size = attr->ia_size;
1919 dirtied |= CEPH_CAP_FILE_EXCL;
1920 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1921 attr->ia_size != inode->i_size) {
1922 req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1923 req->r_args.setattr.old_size =
1924 cpu_to_le64(inode->i_size);
1925 mask |= CEPH_SETATTR_SIZE;
1926 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1927 CEPH_CAP_FILE_WR;
1928 }
1929 }
1930
1931 /* these do nothing */
1932 if (ia_valid & ATTR_CTIME) {
1933 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1934 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1935 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1936 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1937 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1938 only ? "ctime only" : "ignored");
1939 inode->i_ctime = attr->ia_ctime;
1940 if (only) {
1941 /*
1942 * if kernel wants to dirty ctime but nothing else,
1943 * we need to choose a cap to dirty under, or do
1944 * a almost-no-op setattr
1945 */
1946 if (issued & CEPH_CAP_AUTH_EXCL)
1947 dirtied |= CEPH_CAP_AUTH_EXCL;
1948 else if (issued & CEPH_CAP_FILE_EXCL)
1949 dirtied |= CEPH_CAP_FILE_EXCL;
1950 else if (issued & CEPH_CAP_XATTR_EXCL)
1951 dirtied |= CEPH_CAP_XATTR_EXCL;
1952 else
1953 mask |= CEPH_SETATTR_CTIME;
1954 }
1955 }
1956 if (ia_valid & ATTR_FILE)
1957 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1958
1959 if (dirtied) {
1960 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
1961 &prealloc_cf);
1962 inode->i_ctime = CURRENT_TIME;
1963 }
1964
1965 release &= issued;
1966 spin_unlock(&ci->i_ceph_lock);
1967 if (lock_snap_rwsem)
1968 up_read(&mdsc->snap_rwsem);
1969
1970 if (inode_dirty_flags)
1971 __mark_inode_dirty(inode, inode_dirty_flags);
1972
1973 if (ia_valid & ATTR_MODE) {
1974 err = posix_acl_chmod(inode, attr->ia_mode);
1975 if (err)
1976 goto out_put;
1977 }
1978
1979 if (mask) {
1980 req->r_inode = inode;
1981 ihold(inode);
1982 req->r_inode_drop = release;
1983 req->r_args.setattr.mask = cpu_to_le32(mask);
1984 req->r_num_caps = 1;
1985 err = ceph_mdsc_do_request(mdsc, NULL, req);
1986 }
1987 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1988 ceph_cap_string(dirtied), mask);
1989
1990 ceph_mdsc_put_request(req);
1991 if (mask & CEPH_SETATTR_SIZE)
1992 __ceph_do_pending_vmtruncate(inode);
1993 ceph_free_cap_flush(prealloc_cf);
1994 return err;
1995 out_put:
1996 ceph_mdsc_put_request(req);
1997 ceph_free_cap_flush(prealloc_cf);
1998 return err;
1999 }
2000
2001 /*
2002 * Verify that we have a lease on the given mask. If not,
2003 * do a getattr against an mds.
2004 */
2005 int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2006 int mask, bool force)
2007 {
2008 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2009 struct ceph_mds_client *mdsc = fsc->mdsc;
2010 struct ceph_mds_request *req;
2011 int err;
2012
2013 if (ceph_snap(inode) == CEPH_SNAPDIR) {
2014 dout("do_getattr inode %p SNAPDIR\n", inode);
2015 return 0;
2016 }
2017
2018 dout("do_getattr inode %p mask %s mode 0%o\n",
2019 inode, ceph_cap_string(mask), inode->i_mode);
2020 if (!force && ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
2021 return 0;
2022
2023 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
2024 if (IS_ERR(req))
2025 return PTR_ERR(req);
2026 req->r_inode = inode;
2027 ihold(inode);
2028 req->r_num_caps = 1;
2029 req->r_args.getattr.mask = cpu_to_le32(mask);
2030 req->r_locked_page = locked_page;
2031 err = ceph_mdsc_do_request(mdsc, NULL, req);
2032 if (locked_page && err == 0) {
2033 u64 inline_version = req->r_reply_info.targeti.inline_version;
2034 if (inline_version == 0) {
2035 /* the reply is supposed to contain inline data */
2036 err = -EINVAL;
2037 } else if (inline_version == CEPH_INLINE_NONE) {
2038 err = -ENODATA;
2039 } else {
2040 err = req->r_reply_info.targeti.inline_len;
2041 }
2042 }
2043 ceph_mdsc_put_request(req);
2044 dout("do_getattr result=%d\n", err);
2045 return err;
2046 }
2047
2048
2049 /*
2050 * Check inode permissions. We verify we have a valid value for
2051 * the AUTH cap, then call the generic handler.
2052 */
2053 int ceph_permission(struct inode *inode, int mask)
2054 {
2055 int err;
2056
2057 if (mask & MAY_NOT_BLOCK)
2058 return -ECHILD;
2059
2060 err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
2061
2062 if (!err)
2063 err = generic_permission(inode, mask);
2064 return err;
2065 }
2066
2067 /*
2068 * Get all attributes. Hopefully somedata we'll have a statlite()
2069 * and can limit the fields we require to be accurate.
2070 */
2071 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
2072 struct kstat *stat)
2073 {
2074 struct inode *inode = d_inode(dentry);
2075 struct ceph_inode_info *ci = ceph_inode(inode);
2076 int err;
2077
2078 err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL, false);
2079 if (!err) {
2080 generic_fillattr(inode, stat);
2081 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
2082 if (ceph_snap(inode) != CEPH_NOSNAP)
2083 stat->dev = ceph_snap(inode);
2084 else
2085 stat->dev = 0;
2086 if (S_ISDIR(inode->i_mode)) {
2087 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
2088 RBYTES))
2089 stat->size = ci->i_rbytes;
2090 else
2091 stat->size = ci->i_files + ci->i_subdirs;
2092 stat->blocks = 0;
2093 stat->blksize = 65536;
2094 }
2095 }
2096 return err;
2097 }
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