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Linux 3.16-rc2
[linux/fpc-iii.git] / fs / ceph / inode.c
blob04c89c266cecffa2396d0b63774d4811063bbb0f
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_time_warp_seq = 0;
391 ci->i_ceph_flags = 0;
392 atomic_set(&ci->i_release_count, 1);
393 atomic_set(&ci->i_complete_count, 0);
394 ci->i_symlink = NULL;
395
396 memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
397
398 ci->i_fragtree = RB_ROOT;
399 mutex_init(&ci->i_fragtree_mutex);
400
401 ci->i_xattrs.blob = NULL;
402 ci->i_xattrs.prealloc_blob = NULL;
403 ci->i_xattrs.dirty = false;
404 ci->i_xattrs.index = RB_ROOT;
405 ci->i_xattrs.count = 0;
406 ci->i_xattrs.names_size = 0;
407 ci->i_xattrs.vals_size = 0;
408 ci->i_xattrs.version = 0;
409 ci->i_xattrs.index_version = 0;
410
411 ci->i_caps = RB_ROOT;
412 ci->i_auth_cap = NULL;
413 ci->i_dirty_caps = 0;
414 ci->i_flushing_caps = 0;
415 INIT_LIST_HEAD(&ci->i_dirty_item);
416 INIT_LIST_HEAD(&ci->i_flushing_item);
417 ci->i_cap_flush_seq = 0;
418 ci->i_cap_flush_last_tid = 0;
419 memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
420 init_waitqueue_head(&ci->i_cap_wq);
421 ci->i_hold_caps_min = 0;
422 ci->i_hold_caps_max = 0;
423 INIT_LIST_HEAD(&ci->i_cap_delay_list);
424 INIT_LIST_HEAD(&ci->i_cap_snaps);
425 ci->i_head_snapc = NULL;
426 ci->i_snap_caps = 0;
427
428 for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
429 ci->i_nr_by_mode[i] = 0;
430
431 mutex_init(&ci->i_truncate_mutex);
432 ci->i_truncate_seq = 0;
433 ci->i_truncate_size = 0;
434 ci->i_truncate_pending = 0;
435
436 ci->i_max_size = 0;
437 ci->i_reported_size = 0;
438 ci->i_wanted_max_size = 0;
439 ci->i_requested_max_size = 0;
440
441 ci->i_pin_ref = 0;
442 ci->i_rd_ref = 0;
443 ci->i_rdcache_ref = 0;
444 ci->i_wr_ref = 0;
445 ci->i_wb_ref = 0;
446 ci->i_wrbuffer_ref = 0;
447 ci->i_wrbuffer_ref_head = 0;
448 ci->i_shared_gen = 0;
449 ci->i_rdcache_gen = 0;
450 ci->i_rdcache_revoking = 0;
451
452 INIT_LIST_HEAD(&ci->i_unsafe_writes);
453 INIT_LIST_HEAD(&ci->i_unsafe_dirops);
454 spin_lock_init(&ci->i_unsafe_lock);
455
456 ci->i_snap_realm = NULL;
457 INIT_LIST_HEAD(&ci->i_snap_realm_item);
458 INIT_LIST_HEAD(&ci->i_snap_flush_item);
459
460 INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
461 INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
462
463 INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
464
465 ceph_fscache_inode_init(ci);
466
467 return &ci->vfs_inode;
468 }
469
470 static void ceph_i_callback(struct rcu_head *head)
471 {
472 struct inode *inode = container_of(head, struct inode, i_rcu);
473 struct ceph_inode_info *ci = ceph_inode(inode);
474
475 kmem_cache_free(ceph_inode_cachep, ci);
476 }
477
478 void ceph_destroy_inode(struct inode *inode)
479 {
480 struct ceph_inode_info *ci = ceph_inode(inode);
481 struct ceph_inode_frag *frag;
482 struct rb_node *n;
483
484 dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
485
486 ceph_fscache_unregister_inode_cookie(ci);
487
488 ceph_queue_caps_release(inode);
489
490 /*
491 * we may still have a snap_realm reference if there are stray
492 * caps in i_snap_caps.
493 */
494 if (ci->i_snap_realm) {
495 struct ceph_mds_client *mdsc =
496 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
497 struct ceph_snap_realm *realm = ci->i_snap_realm;
498
499 dout(" dropping residual ref to snap realm %p\n", realm);
500 spin_lock(&realm->inodes_with_caps_lock);
501 list_del_init(&ci->i_snap_realm_item);
502 spin_unlock(&realm->inodes_with_caps_lock);
503 ceph_put_snap_realm(mdsc, realm);
504 }
505
506 kfree(ci->i_symlink);
507 while ((n = rb_first(&ci->i_fragtree)) != NULL) {
508 frag = rb_entry(n, struct ceph_inode_frag, node);
509 rb_erase(n, &ci->i_fragtree);
510 kfree(frag);
511 }
512
513 __ceph_destroy_xattrs(ci);
514 if (ci->i_xattrs.blob)
515 ceph_buffer_put(ci->i_xattrs.blob);
516 if (ci->i_xattrs.prealloc_blob)
517 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
518
519 call_rcu(&inode->i_rcu, ceph_i_callback);
520 }
521
522 int ceph_drop_inode(struct inode *inode)
523 {
524 /*
525 * Positve dentry and corresponding inode are always accompanied
526 * in MDS reply. So no need to keep inode in the cache after
527 * dropping all its aliases.
528 */
529 return 1;
530 }
531
532 /*
533 * Helpers to fill in size, ctime, mtime, and atime. We have to be
534 * careful because either the client or MDS may have more up to date
535 * info, depending on which capabilities are held, and whether
536 * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime
537 * and size are monotonically increasing, except when utimes() or
538 * truncate() increments the corresponding _seq values.)
539 */
540 int ceph_fill_file_size(struct inode *inode, int issued,
541 u32 truncate_seq, u64 truncate_size, u64 size)
542 {
543 struct ceph_inode_info *ci = ceph_inode(inode);
544 int queue_trunc = 0;
545
546 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
547 (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
548 dout("size %lld -> %llu\n", inode->i_size, size);
549 inode->i_size = size;
550 inode->i_blocks = (size + (1<<9) - 1) >> 9;
551 ci->i_reported_size = size;
552 if (truncate_seq != ci->i_truncate_seq) {
553 dout("truncate_seq %u -> %u\n",
554 ci->i_truncate_seq, truncate_seq);
555 ci->i_truncate_seq = truncate_seq;
556
557 /* the MDS should have revoked these caps */
558 WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
559 CEPH_CAP_FILE_RD |
560 CEPH_CAP_FILE_WR |
561 CEPH_CAP_FILE_LAZYIO));
562 /*
563 * If we hold relevant caps, or in the case where we're
564 * not the only client referencing this file and we
565 * don't hold those caps, then we need to check whether
566 * the file is either opened or mmaped
567 */
568 if ((issued & (CEPH_CAP_FILE_CACHE|
569 CEPH_CAP_FILE_BUFFER)) ||
570 mapping_mapped(inode->i_mapping) ||
571 __ceph_caps_file_wanted(ci)) {
572 ci->i_truncate_pending++;
573 queue_trunc = 1;
574 }
575 }
576 }
577 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
578 ci->i_truncate_size != truncate_size) {
579 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
580 truncate_size);
581 ci->i_truncate_size = truncate_size;
582 }
583
584 if (queue_trunc)
585 ceph_fscache_invalidate(inode);
586
587 return queue_trunc;
588 }
589
590 void ceph_fill_file_time(struct inode *inode, int issued,
591 u64 time_warp_seq, struct timespec *ctime,
592 struct timespec *mtime, struct timespec *atime)
593 {
594 struct ceph_inode_info *ci = ceph_inode(inode);
595 int warn = 0;
596
597 if (issued & (CEPH_CAP_FILE_EXCL|
598 CEPH_CAP_FILE_WR|
599 CEPH_CAP_FILE_BUFFER|
600 CEPH_CAP_AUTH_EXCL|
601 CEPH_CAP_XATTR_EXCL)) {
602 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
603 dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
604 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
605 ctime->tv_sec, ctime->tv_nsec);
606 inode->i_ctime = *ctime;
607 }
608 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
609 /* the MDS did a utimes() */
610 dout("mtime %ld.%09ld -> %ld.%09ld "
611 "tw %d -> %d\n",
612 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
613 mtime->tv_sec, mtime->tv_nsec,
614 ci->i_time_warp_seq, (int)time_warp_seq);
615
616 inode->i_mtime = *mtime;
617 inode->i_atime = *atime;
618 ci->i_time_warp_seq = time_warp_seq;
619 } else if (time_warp_seq == ci->i_time_warp_seq) {
620 /* nobody did utimes(); take the max */
621 if (timespec_compare(mtime, &inode->i_mtime) > 0) {
622 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
623 inode->i_mtime.tv_sec,
624 inode->i_mtime.tv_nsec,
625 mtime->tv_sec, mtime->tv_nsec);
626 inode->i_mtime = *mtime;
627 }
628 if (timespec_compare(atime, &inode->i_atime) > 0) {
629 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
630 inode->i_atime.tv_sec,
631 inode->i_atime.tv_nsec,
632 atime->tv_sec, atime->tv_nsec);
633 inode->i_atime = *atime;
634 }
635 } else if (issued & CEPH_CAP_FILE_EXCL) {
636 /* we did a utimes(); ignore mds values */
637 } else {
638 warn = 1;
639 }
640 } else {
641 /* we have no write|excl caps; whatever the MDS says is true */
642 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
643 inode->i_ctime = *ctime;
644 inode->i_mtime = *mtime;
645 inode->i_atime = *atime;
646 ci->i_time_warp_seq = time_warp_seq;
647 } else {
648 warn = 1;
649 }
650 }
651 if (warn) /* time_warp_seq shouldn't go backwards */
652 dout("%p mds time_warp_seq %llu < %u\n",
653 inode, time_warp_seq, ci->i_time_warp_seq);
654 }
655
656 /*
657 * Populate an inode based on info from mds. May be called on new or
658 * existing inodes.
659 */
660 static int fill_inode(struct inode *inode,
661 struct ceph_mds_reply_info_in *iinfo,
662 struct ceph_mds_reply_dirfrag *dirinfo,
663 struct ceph_mds_session *session,
664 unsigned long ttl_from, int cap_fmode,
665 struct ceph_cap_reservation *caps_reservation)
666 {
667 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
668 struct ceph_mds_reply_inode *info = iinfo->in;
669 struct ceph_inode_info *ci = ceph_inode(inode);
670 int issued = 0, implemented, new_issued;
671 struct timespec mtime, atime, ctime;
672 struct ceph_buffer *xattr_blob = NULL;
673 struct ceph_cap *new_cap = NULL;
674 int err = 0;
675 bool wake = false;
676 bool queue_trunc = false;
677 bool new_version = false;
678
679 dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
680 inode, ceph_vinop(inode), le64_to_cpu(info->version),
681 ci->i_version);
682
683 /* prealloc new cap struct */
684 if (info->cap.caps && ceph_snap(inode) == CEPH_NOSNAP)
685 new_cap = ceph_get_cap(mdsc, caps_reservation);
686
687 /*
688 * prealloc xattr data, if it looks like we'll need it. only
689 * if len > 4 (meaning there are actually xattrs; the first 4
690 * bytes are the xattr count).
691 */
692 if (iinfo->xattr_len > 4) {
693 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
694 if (!xattr_blob)
695 pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
696 iinfo->xattr_len);
697 }
698
699 spin_lock(&ci->i_ceph_lock);
700
701 /*
702 * provided version will be odd if inode value is projected,
703 * even if stable. skip the update if we have newer stable
704 * info (ours>=theirs, e.g. due to racing mds replies), unless
705 * we are getting projected (unstable) info (in which case the
706 * version is odd, and we want ours>theirs).
707 * us them
708 * 2 2 skip
709 * 3 2 skip
710 * 3 3 update
711 */
712 if (ci->i_version == 0 ||
713 ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
714 le64_to_cpu(info->version) > (ci->i_version & ~1)))
715 new_version = true;
716
717 issued = __ceph_caps_issued(ci, &implemented);
718 issued |= implemented | __ceph_caps_dirty(ci);
719 new_issued = ~issued & le32_to_cpu(info->cap.caps);
720
721 /* update inode */
722 ci->i_version = le64_to_cpu(info->version);
723 inode->i_version++;
724 inode->i_rdev = le32_to_cpu(info->rdev);
725 inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
726
727 if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
728 (issued & CEPH_CAP_AUTH_EXCL) == 0) {
729 inode->i_mode = le32_to_cpu(info->mode);
730 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
731 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
732 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
733 from_kuid(&init_user_ns, inode->i_uid),
734 from_kgid(&init_user_ns, inode->i_gid));
735 }
736
737 if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
738 (issued & CEPH_CAP_LINK_EXCL) == 0)
739 set_nlink(inode, le32_to_cpu(info->nlink));
740
741 if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
742 /* be careful with mtime, atime, size */
743 ceph_decode_timespec(&atime, &info->atime);
744 ceph_decode_timespec(&mtime, &info->mtime);
745 ceph_decode_timespec(&ctime, &info->ctime);
746 ceph_fill_file_time(inode, issued,
747 le32_to_cpu(info->time_warp_seq),
748 &ctime, &mtime, &atime);
749 }
750
751 if (new_version ||
752 (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
753 ci->i_layout = info->layout;
754 queue_trunc = ceph_fill_file_size(inode, issued,
755 le32_to_cpu(info->truncate_seq),
756 le64_to_cpu(info->truncate_size),
757 le64_to_cpu(info->size));
758 /* only update max_size on auth cap */
759 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
760 ci->i_max_size != le64_to_cpu(info->max_size)) {
761 dout("max_size %lld -> %llu\n", ci->i_max_size,
762 le64_to_cpu(info->max_size));
763 ci->i_max_size = le64_to_cpu(info->max_size);
764 }
765 }
766
767 /* xattrs */
768 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
769 if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
770 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
771 if (ci->i_xattrs.blob)
772 ceph_buffer_put(ci->i_xattrs.blob);
773 ci->i_xattrs.blob = xattr_blob;
774 if (xattr_blob)
775 memcpy(ci->i_xattrs.blob->vec.iov_base,
776 iinfo->xattr_data, iinfo->xattr_len);
777 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
778 ceph_forget_all_cached_acls(inode);
779 xattr_blob = NULL;
780 }
781
782 inode->i_mapping->a_ops = &ceph_aops;
783 inode->i_mapping->backing_dev_info =
784 &ceph_sb_to_client(inode->i_sb)->backing_dev_info;
785
786 switch (inode->i_mode & S_IFMT) {
787 case S_IFIFO:
788 case S_IFBLK:
789 case S_IFCHR:
790 case S_IFSOCK:
791 init_special_inode(inode, inode->i_mode, inode->i_rdev);
792 inode->i_op = &ceph_file_iops;
793 break;
794 case S_IFREG:
795 inode->i_op = &ceph_file_iops;
796 inode->i_fop = &ceph_file_fops;
797 break;
798 case S_IFLNK:
799 inode->i_op = &ceph_symlink_iops;
800 if (!ci->i_symlink) {
801 u32 symlen = iinfo->symlink_len;
802 char *sym;
803
804 spin_unlock(&ci->i_ceph_lock);
805
806 err = -EINVAL;
807 if (WARN_ON(symlen != inode->i_size))
808 goto out;
809
810 err = -ENOMEM;
811 sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
812 if (!sym)
813 goto out;
814
815 spin_lock(&ci->i_ceph_lock);
816 if (!ci->i_symlink)
817 ci->i_symlink = sym;
818 else
819 kfree(sym); /* lost a race */
820 }
821 break;
822 case S_IFDIR:
823 inode->i_op = &ceph_dir_iops;
824 inode->i_fop = &ceph_dir_fops;
825
826 ci->i_dir_layout = iinfo->dir_layout;
827
828 ci->i_files = le64_to_cpu(info->files);
829 ci->i_subdirs = le64_to_cpu(info->subdirs);
830 ci->i_rbytes = le64_to_cpu(info->rbytes);
831 ci->i_rfiles = le64_to_cpu(info->rfiles);
832 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
833 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
834 break;
835 default:
836 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
837 ceph_vinop(inode), inode->i_mode);
838 }
839
840 /* set dir completion flag? */
841 if (S_ISDIR(inode->i_mode) &&
842 ci->i_files == 0 && ci->i_subdirs == 0 &&
843 ceph_snap(inode) == CEPH_NOSNAP &&
844 (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
845 (issued & CEPH_CAP_FILE_EXCL) == 0 &&
846 !__ceph_dir_is_complete(ci)) {
847 dout(" marking %p complete (empty)\n", inode);
848 __ceph_dir_set_complete(ci, atomic_read(&ci->i_release_count));
849 }
850
851 /* were we issued a capability? */
852 if (info->cap.caps) {
853 if (ceph_snap(inode) == CEPH_NOSNAP) {
854 ceph_add_cap(inode, session,
855 le64_to_cpu(info->cap.cap_id),
856 cap_fmode,
857 le32_to_cpu(info->cap.caps),
858 le32_to_cpu(info->cap.wanted),
859 le32_to_cpu(info->cap.seq),
860 le32_to_cpu(info->cap.mseq),
861 le64_to_cpu(info->cap.realm),
862 info->cap.flags, &new_cap);
863 wake = true;
864 } else {
865 dout(" %p got snap_caps %s\n", inode,
866 ceph_cap_string(le32_to_cpu(info->cap.caps)));
867 ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
868 if (cap_fmode >= 0)
869 __ceph_get_fmode(ci, cap_fmode);
870 }
871 } else if (cap_fmode >= 0) {
872 pr_warn("mds issued no caps on %llx.%llx\n",
873 ceph_vinop(inode));
874 __ceph_get_fmode(ci, cap_fmode);
875 }
876 spin_unlock(&ci->i_ceph_lock);
877
878 if (wake)
879 wake_up_all(&ci->i_cap_wq);
880
881 /* queue truncate if we saw i_size decrease */
882 if (queue_trunc)
883 ceph_queue_vmtruncate(inode);
884
885 /* populate frag tree */
886 if (S_ISDIR(inode->i_mode))
887 ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
888
889 /* update delegation info? */
890 if (dirinfo)
891 ceph_fill_dirfrag(inode, dirinfo);
892
893 err = 0;
894 out:
895 if (new_cap)
896 ceph_put_cap(mdsc, new_cap);
897 if (xattr_blob)
898 ceph_buffer_put(xattr_blob);
899 return err;
900 }
901
902 /*
903 * caller should hold session s_mutex.
904 */
905 static void update_dentry_lease(struct dentry *dentry,
906 struct ceph_mds_reply_lease *lease,
907 struct ceph_mds_session *session,
908 unsigned long from_time)
909 {
910 struct ceph_dentry_info *di = ceph_dentry(dentry);
911 long unsigned duration = le32_to_cpu(lease->duration_ms);
912 long unsigned ttl = from_time + (duration * HZ) / 1000;
913 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
914 struct inode *dir;
915
916 /* only track leases on regular dentries */
917 if (dentry->d_op != &ceph_dentry_ops)
918 return;
919
920 spin_lock(&dentry->d_lock);
921 dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
922 dentry, duration, ttl);
923
924 /* make lease_rdcache_gen match directory */
925 dir = dentry->d_parent->d_inode;
926 di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
927
928 if (duration == 0)
929 goto out_unlock;
930
931 if (di->lease_gen == session->s_cap_gen &&
932 time_before(ttl, dentry->d_time))
933 goto out_unlock; /* we already have a newer lease. */
934
935 if (di->lease_session && di->lease_session != session)
936 goto out_unlock;
937
938 ceph_dentry_lru_touch(dentry);
939
940 if (!di->lease_session)
941 di->lease_session = ceph_get_mds_session(session);
942 di->lease_gen = session->s_cap_gen;
943 di->lease_seq = le32_to_cpu(lease->seq);
944 di->lease_renew_after = half_ttl;
945 di->lease_renew_from = 0;
946 dentry->d_time = ttl;
947 out_unlock:
948 spin_unlock(&dentry->d_lock);
949 return;
950 }
951
952 /*
953 * splice a dentry to an inode.
954 * caller must hold directory i_mutex for this to be safe.
955 *
956 * we will only rehash the resulting dentry if @prehash is
957 * true; @prehash will be set to false (for the benefit of
958 * the caller) if we fail.
959 */
960 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
961 bool *prehash)
962 {
963 struct dentry *realdn;
964
965 BUG_ON(dn->d_inode);
966
967 /* dn must be unhashed */
968 if (!d_unhashed(dn))
969 d_drop(dn);
970 realdn = d_materialise_unique(dn, in);
971 if (IS_ERR(realdn)) {
972 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
973 PTR_ERR(realdn), dn, in, ceph_vinop(in));
974 if (prehash)
975 *prehash = false; /* don't rehash on error */
976 dn = realdn; /* note realdn contains the error */
977 goto out;
978 } else if (realdn) {
979 dout("dn %p (%d) spliced with %p (%d) "
980 "inode %p ino %llx.%llx\n",
981 dn, d_count(dn),
982 realdn, d_count(realdn),
983 realdn->d_inode, ceph_vinop(realdn->d_inode));
984 dput(dn);
985 dn = realdn;
986 } else {
987 BUG_ON(!ceph_dentry(dn));
988 dout("dn %p attached to %p ino %llx.%llx\n",
989 dn, dn->d_inode, ceph_vinop(dn->d_inode));
990 }
991 if ((!prehash || *prehash) && d_unhashed(dn))
992 d_rehash(dn);
993 out:
994 return dn;
995 }
996
997 /*
998 * Incorporate results into the local cache. This is either just
999 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1000 * after a lookup).
1001 *
1002 * A reply may contain
1003 * a directory inode along with a dentry.
1004 * and/or a target inode
1005 *
1006 * Called with snap_rwsem (read).
1007 */
1008 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
1009 struct ceph_mds_session *session)
1010 {
1011 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1012 struct inode *in = NULL;
1013 struct ceph_vino vino;
1014 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1015 int err = 0;
1016
1017 dout("fill_trace %p is_dentry %d is_target %d\n", req,
1018 rinfo->head->is_dentry, rinfo->head->is_target);
1019
1020 #if 0
1021 /*
1022 * Debugging hook:
1023 *
1024 * If we resend completed ops to a recovering mds, we get no
1025 * trace. Since that is very rare, pretend this is the case
1026 * to ensure the 'no trace' handlers in the callers behave.
1027 *
1028 * Fill in inodes unconditionally to avoid breaking cap
1029 * invariants.
1030 */
1031 if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
1032 pr_info("fill_trace faking empty trace on %lld %s\n",
1033 req->r_tid, ceph_mds_op_name(rinfo->head->op));
1034 if (rinfo->head->is_dentry) {
1035 rinfo->head->is_dentry = 0;
1036 err = fill_inode(req->r_locked_dir,
1037 &rinfo->diri, rinfo->dirfrag,
1038 session, req->r_request_started, -1);
1039 }
1040 if (rinfo->head->is_target) {
1041 rinfo->head->is_target = 0;
1042 ininfo = rinfo->targeti.in;
1043 vino.ino = le64_to_cpu(ininfo->ino);
1044 vino.snap = le64_to_cpu(ininfo->snapid);
1045 in = ceph_get_inode(sb, vino);
1046 err = fill_inode(in, &rinfo->targeti, NULL,
1047 session, req->r_request_started,
1048 req->r_fmode);
1049 iput(in);
1050 }
1051 }
1052 #endif
1053
1054 if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1055 dout("fill_trace reply is empty!\n");
1056 if (rinfo->head->result == 0 && req->r_locked_dir)
1057 ceph_invalidate_dir_request(req);
1058 return 0;
1059 }
1060
1061 if (rinfo->head->is_dentry) {
1062 struct inode *dir = req->r_locked_dir;
1063
1064 if (dir) {
1065 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
1066 session, req->r_request_started, -1,
1067 &req->r_caps_reservation);
1068 if (err < 0)
1069 goto done;
1070 } else {
1071 WARN_ON_ONCE(1);
1072 }
1073
1074 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME) {
1075 struct qstr dname;
1076 struct dentry *dn, *parent;
1077
1078 BUG_ON(!rinfo->head->is_target);
1079 BUG_ON(req->r_dentry);
1080
1081 parent = d_find_any_alias(dir);
1082 BUG_ON(!parent);
1083
1084 dname.name = rinfo->dname;
1085 dname.len = rinfo->dname_len;
1086 dname.hash = full_name_hash(dname.name, dname.len);
1087 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1088 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1089 retry_lookup:
1090 dn = d_lookup(parent, &dname);
1091 dout("d_lookup on parent=%p name=%.*s got %p\n",
1092 parent, dname.len, dname.name, dn);
1093
1094 if (!dn) {
1095 dn = d_alloc(parent, &dname);
1096 dout("d_alloc %p '%.*s' = %p\n", parent,
1097 dname.len, dname.name, dn);
1098 if (dn == NULL) {
1099 dput(parent);
1100 err = -ENOMEM;
1101 goto done;
1102 }
1103 err = ceph_init_dentry(dn);
1104 if (err < 0) {
1105 dput(dn);
1106 dput(parent);
1107 goto done;
1108 }
1109 } else if (dn->d_inode &&
1110 (ceph_ino(dn->d_inode) != vino.ino ||
1111 ceph_snap(dn->d_inode) != vino.snap)) {
1112 dout(" dn %p points to wrong inode %p\n",
1113 dn, dn->d_inode);
1114 d_delete(dn);
1115 dput(dn);
1116 goto retry_lookup;
1117 }
1118
1119 req->r_dentry = dn;
1120 dput(parent);
1121 }
1122 }
1123
1124 if (rinfo->head->is_target) {
1125 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1126 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1127
1128 in = ceph_get_inode(sb, vino);
1129 if (IS_ERR(in)) {
1130 err = PTR_ERR(in);
1131 goto done;
1132 }
1133 req->r_target_inode = in;
1134
1135 err = fill_inode(in, &rinfo->targeti, NULL,
1136 session, req->r_request_started,
1137 (!req->r_aborted && rinfo->head->result == 0) ?
1138 req->r_fmode : -1,
1139 &req->r_caps_reservation);
1140 if (err < 0) {
1141 pr_err("fill_inode badness %p %llx.%llx\n",
1142 in, ceph_vinop(in));
1143 goto done;
1144 }
1145 }
1146
1147 /*
1148 * ignore null lease/binding on snapdir ENOENT, or else we
1149 * will have trouble splicing in the virtual snapdir later
1150 */
1151 if (rinfo->head->is_dentry && !req->r_aborted &&
1152 req->r_locked_dir &&
1153 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1154 fsc->mount_options->snapdir_name,
1155 req->r_dentry->d_name.len))) {
1156 /*
1157 * lookup link rename : null -> possibly existing inode
1158 * mknod symlink mkdir : null -> new inode
1159 * unlink : linked -> null
1160 */
1161 struct inode *dir = req->r_locked_dir;
1162 struct dentry *dn = req->r_dentry;
1163 bool have_dir_cap, have_lease;
1164
1165 BUG_ON(!dn);
1166 BUG_ON(!dir);
1167 BUG_ON(dn->d_parent->d_inode != dir);
1168 BUG_ON(ceph_ino(dir) !=
1169 le64_to_cpu(rinfo->diri.in->ino));
1170 BUG_ON(ceph_snap(dir) !=
1171 le64_to_cpu(rinfo->diri.in->snapid));
1172
1173 /* do we have a lease on the whole dir? */
1174 have_dir_cap =
1175 (le32_to_cpu(rinfo->diri.in->cap.caps) &
1176 CEPH_CAP_FILE_SHARED);
1177
1178 /* do we have a dn lease? */
1179 have_lease = have_dir_cap ||
1180 le32_to_cpu(rinfo->dlease->duration_ms);
1181 if (!have_lease)
1182 dout("fill_trace no dentry lease or dir cap\n");
1183
1184 /* rename? */
1185 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1186 struct inode *olddir = req->r_old_dentry_dir;
1187 BUG_ON(!olddir);
1188
1189 dout(" src %p '%.*s' dst %p '%.*s'\n",
1190 req->r_old_dentry,
1191 req->r_old_dentry->d_name.len,
1192 req->r_old_dentry->d_name.name,
1193 dn, dn->d_name.len, dn->d_name.name);
1194 dout("fill_trace doing d_move %p -> %p\n",
1195 req->r_old_dentry, dn);
1196
1197 d_move(req->r_old_dentry, dn);
1198 dout(" src %p '%.*s' dst %p '%.*s'\n",
1199 req->r_old_dentry,
1200 req->r_old_dentry->d_name.len,
1201 req->r_old_dentry->d_name.name,
1202 dn, dn->d_name.len, dn->d_name.name);
1203
1204 /* ensure target dentry is invalidated, despite
1205 rehashing bug in vfs_rename_dir */
1206 ceph_invalidate_dentry_lease(dn);
1207
1208 /* d_move screws up sibling dentries' offsets */
1209 ceph_dir_clear_complete(dir);
1210 ceph_dir_clear_complete(olddir);
1211
1212 dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1213 ceph_dentry(req->r_old_dentry)->offset);
1214
1215 dn = req->r_old_dentry; /* use old_dentry */
1216 }
1217
1218 /* null dentry? */
1219 if (!rinfo->head->is_target) {
1220 dout("fill_trace null dentry\n");
1221 if (dn->d_inode) {
1222 dout("d_delete %p\n", dn);
1223 d_delete(dn);
1224 } else {
1225 dout("d_instantiate %p NULL\n", dn);
1226 d_instantiate(dn, NULL);
1227 if (have_lease && d_unhashed(dn))
1228 d_rehash(dn);
1229 update_dentry_lease(dn, rinfo->dlease,
1230 session,
1231 req->r_request_started);
1232 }
1233 goto done;
1234 }
1235
1236 /* attach proper inode */
1237 if (!dn->d_inode) {
1238 ceph_dir_clear_complete(dir);
1239 ihold(in);
1240 dn = splice_dentry(dn, in, &have_lease);
1241 if (IS_ERR(dn)) {
1242 err = PTR_ERR(dn);
1243 goto done;
1244 }
1245 req->r_dentry = dn; /* may have spliced */
1246 } else if (dn->d_inode && dn->d_inode != in) {
1247 dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1248 dn, dn->d_inode, ceph_vinop(dn->d_inode),
1249 ceph_vinop(in));
1250 have_lease = false;
1251 }
1252
1253 if (have_lease)
1254 update_dentry_lease(dn, rinfo->dlease, session,
1255 req->r_request_started);
1256 dout(" final dn %p\n", dn);
1257 } else if (!req->r_aborted &&
1258 (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1259 req->r_op == CEPH_MDS_OP_MKSNAP)) {
1260 struct dentry *dn = req->r_dentry;
1261 struct inode *dir = req->r_locked_dir;
1262
1263 /* fill out a snapdir LOOKUPSNAP dentry */
1264 BUG_ON(!dn);
1265 BUG_ON(!dir);
1266 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1267 dout(" linking snapped dir %p to dn %p\n", in, dn);
1268 ceph_dir_clear_complete(dir);
1269 ihold(in);
1270 dn = splice_dentry(dn, in, NULL);
1271 if (IS_ERR(dn)) {
1272 err = PTR_ERR(dn);
1273 goto done;
1274 }
1275 req->r_dentry = dn; /* may have spliced */
1276 }
1277 done:
1278 dout("fill_trace done err=%d\n", err);
1279 return err;
1280 }
1281
1282 /*
1283 * Prepopulate our cache with readdir results, leases, etc.
1284 */
1285 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1286 struct ceph_mds_session *session)
1287 {
1288 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1289 int i, err = 0;
1290
1291 for (i = 0; i < rinfo->dir_nr; i++) {
1292 struct ceph_vino vino;
1293 struct inode *in;
1294 int rc;
1295
1296 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1297 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1298
1299 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1300 if (IS_ERR(in)) {
1301 err = PTR_ERR(in);
1302 dout("new_inode badness got %d\n", err);
1303 continue;
1304 }
1305 rc = fill_inode(in, &rinfo->dir_in[i], NULL, session,
1306 req->r_request_started, -1,
1307 &req->r_caps_reservation);
1308 if (rc < 0) {
1309 pr_err("fill_inode badness on %p got %d\n", in, rc);
1310 err = rc;
1311 continue;
1312 }
1313 }
1314
1315 return err;
1316 }
1317
1318 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1319 struct ceph_mds_session *session)
1320 {
1321 struct dentry *parent = req->r_dentry;
1322 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1323 struct qstr dname;
1324 struct dentry *dn;
1325 struct inode *in;
1326 int err = 0, ret, i;
1327 struct inode *snapdir = NULL;
1328 struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1329 struct ceph_dentry_info *di;
1330 u64 r_readdir_offset = req->r_readdir_offset;
1331 u32 frag = le32_to_cpu(rhead->args.readdir.frag);
1332
1333 if (rinfo->dir_dir &&
1334 le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1335 dout("readdir_prepopulate got new frag %x -> %x\n",
1336 frag, le32_to_cpu(rinfo->dir_dir->frag));
1337 frag = le32_to_cpu(rinfo->dir_dir->frag);
1338 if (ceph_frag_is_leftmost(frag))
1339 r_readdir_offset = 2;
1340 else
1341 r_readdir_offset = 0;
1342 }
1343
1344 if (req->r_aborted)
1345 return readdir_prepopulate_inodes_only(req, session);
1346
1347 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1348 snapdir = ceph_get_snapdir(parent->d_inode);
1349 parent = d_find_alias(snapdir);
1350 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1351 rinfo->dir_nr, parent);
1352 } else {
1353 dout("readdir_prepopulate %d items under dn %p\n",
1354 rinfo->dir_nr, parent);
1355 if (rinfo->dir_dir)
1356 ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1357 }
1358
1359 /* FIXME: release caps/leases if error occurs */
1360 for (i = 0; i < rinfo->dir_nr; i++) {
1361 struct ceph_vino vino;
1362
1363 dname.name = rinfo->dir_dname[i];
1364 dname.len = rinfo->dir_dname_len[i];
1365 dname.hash = full_name_hash(dname.name, dname.len);
1366
1367 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1368 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1369
1370 retry_lookup:
1371 dn = d_lookup(parent, &dname);
1372 dout("d_lookup on parent=%p name=%.*s got %p\n",
1373 parent, dname.len, dname.name, dn);
1374
1375 if (!dn) {
1376 dn = d_alloc(parent, &dname);
1377 dout("d_alloc %p '%.*s' = %p\n", parent,
1378 dname.len, dname.name, dn);
1379 if (dn == NULL) {
1380 dout("d_alloc badness\n");
1381 err = -ENOMEM;
1382 goto out;
1383 }
1384 ret = ceph_init_dentry(dn);
1385 if (ret < 0) {
1386 dput(dn);
1387 err = ret;
1388 goto out;
1389 }
1390 } else if (dn->d_inode &&
1391 (ceph_ino(dn->d_inode) != vino.ino ||
1392 ceph_snap(dn->d_inode) != vino.snap)) {
1393 dout(" dn %p points to wrong inode %p\n",
1394 dn, dn->d_inode);
1395 d_delete(dn);
1396 dput(dn);
1397 goto retry_lookup;
1398 } else {
1399 /* reorder parent's d_subdirs */
1400 spin_lock(&parent->d_lock);
1401 spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
1402 list_move(&dn->d_u.d_child, &parent->d_subdirs);
1403 spin_unlock(&dn->d_lock);
1404 spin_unlock(&parent->d_lock);
1405 }
1406
1407 /* inode */
1408 if (dn->d_inode) {
1409 in = dn->d_inode;
1410 } else {
1411 in = ceph_get_inode(parent->d_sb, vino);
1412 if (IS_ERR(in)) {
1413 dout("new_inode badness\n");
1414 d_drop(dn);
1415 dput(dn);
1416 err = PTR_ERR(in);
1417 goto out;
1418 }
1419 }
1420
1421 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1422 req->r_request_started, -1,
1423 &req->r_caps_reservation) < 0) {
1424 pr_err("fill_inode badness on %p\n", in);
1425 if (!dn->d_inode)
1426 iput(in);
1427 d_drop(dn);
1428 goto next_item;
1429 }
1430
1431 if (!dn->d_inode) {
1432 dn = splice_dentry(dn, in, NULL);
1433 if (IS_ERR(dn)) {
1434 err = PTR_ERR(dn);
1435 dn = NULL;
1436 goto next_item;
1437 }
1438 }
1439
1440 di = dn->d_fsdata;
1441 di->offset = ceph_make_fpos(frag, i + r_readdir_offset);
1442
1443 update_dentry_lease(dn, rinfo->dir_dlease[i],
1444 req->r_session,
1445 req->r_request_started);
1446 next_item:
1447 if (dn)
1448 dput(dn);
1449 }
1450 if (err == 0)
1451 req->r_did_prepopulate = true;
1452
1453 out:
1454 if (snapdir) {
1455 iput(snapdir);
1456 dput(parent);
1457 }
1458 dout("readdir_prepopulate done\n");
1459 return err;
1460 }
1461
1462 int ceph_inode_set_size(struct inode *inode, loff_t size)
1463 {
1464 struct ceph_inode_info *ci = ceph_inode(inode);
1465 int ret = 0;
1466
1467 spin_lock(&ci->i_ceph_lock);
1468 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1469 inode->i_size = size;
1470 inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1471
1472 /* tell the MDS if we are approaching max_size */
1473 if ((size << 1) >= ci->i_max_size &&
1474 (ci->i_reported_size << 1) < ci->i_max_size)
1475 ret = 1;
1476
1477 spin_unlock(&ci->i_ceph_lock);
1478 return ret;
1479 }
1480
1481 /*
1482 * Write back inode data in a worker thread. (This can't be done
1483 * in the message handler context.)
1484 */
1485 void ceph_queue_writeback(struct inode *inode)
1486 {
1487 ihold(inode);
1488 if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1489 &ceph_inode(inode)->i_wb_work)) {
1490 dout("ceph_queue_writeback %p\n", inode);
1491 } else {
1492 dout("ceph_queue_writeback %p failed\n", inode);
1493 iput(inode);
1494 }
1495 }
1496
1497 static void ceph_writeback_work(struct work_struct *work)
1498 {
1499 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1500 i_wb_work);
1501 struct inode *inode = &ci->vfs_inode;
1502
1503 dout("writeback %p\n", inode);
1504 filemap_fdatawrite(&inode->i_data);
1505 iput(inode);
1506 }
1507
1508 /*
1509 * queue an async invalidation
1510 */
1511 void ceph_queue_invalidate(struct inode *inode)
1512 {
1513 ihold(inode);
1514 if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1515 &ceph_inode(inode)->i_pg_inv_work)) {
1516 dout("ceph_queue_invalidate %p\n", inode);
1517 } else {
1518 dout("ceph_queue_invalidate %p failed\n", inode);
1519 iput(inode);
1520 }
1521 }
1522
1523 /*
1524 * Invalidate inode pages in a worker thread. (This can't be done
1525 * in the message handler context.)
1526 */
1527 static void ceph_invalidate_work(struct work_struct *work)
1528 {
1529 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1530 i_pg_inv_work);
1531 struct inode *inode = &ci->vfs_inode;
1532 u32 orig_gen;
1533 int check = 0;
1534
1535 mutex_lock(&ci->i_truncate_mutex);
1536 spin_lock(&ci->i_ceph_lock);
1537 dout("invalidate_pages %p gen %d revoking %d\n", inode,
1538 ci->i_rdcache_gen, ci->i_rdcache_revoking);
1539 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1540 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1541 check = 1;
1542 spin_unlock(&ci->i_ceph_lock);
1543 mutex_unlock(&ci->i_truncate_mutex);
1544 goto out;
1545 }
1546 orig_gen = ci->i_rdcache_gen;
1547 spin_unlock(&ci->i_ceph_lock);
1548
1549 truncate_pagecache(inode, 0);
1550
1551 spin_lock(&ci->i_ceph_lock);
1552 if (orig_gen == ci->i_rdcache_gen &&
1553 orig_gen == ci->i_rdcache_revoking) {
1554 dout("invalidate_pages %p gen %d successful\n", inode,
1555 ci->i_rdcache_gen);
1556 ci->i_rdcache_revoking--;
1557 check = 1;
1558 } else {
1559 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1560 inode, orig_gen, ci->i_rdcache_gen,
1561 ci->i_rdcache_revoking);
1562 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1563 check = 1;
1564 }
1565 spin_unlock(&ci->i_ceph_lock);
1566 mutex_unlock(&ci->i_truncate_mutex);
1567 out:
1568 if (check)
1569 ceph_check_caps(ci, 0, NULL);
1570 iput(inode);
1571 }
1572
1573
1574 /*
1575 * called by trunc_wq;
1576 *
1577 * We also truncate in a separate thread as well.
1578 */
1579 static void ceph_vmtruncate_work(struct work_struct *work)
1580 {
1581 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1582 i_vmtruncate_work);
1583 struct inode *inode = &ci->vfs_inode;
1584
1585 dout("vmtruncate_work %p\n", inode);
1586 __ceph_do_pending_vmtruncate(inode);
1587 iput(inode);
1588 }
1589
1590 /*
1591 * Queue an async vmtruncate. If we fail to queue work, we will handle
1592 * the truncation the next time we call __ceph_do_pending_vmtruncate.
1593 */
1594 void ceph_queue_vmtruncate(struct inode *inode)
1595 {
1596 struct ceph_inode_info *ci = ceph_inode(inode);
1597
1598 ihold(inode);
1599
1600 if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1601 &ci->i_vmtruncate_work)) {
1602 dout("ceph_queue_vmtruncate %p\n", inode);
1603 } else {
1604 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1605 inode, ci->i_truncate_pending);
1606 iput(inode);
1607 }
1608 }
1609
1610 /*
1611 * Make sure any pending truncation is applied before doing anything
1612 * that may depend on it.
1613 */
1614 void __ceph_do_pending_vmtruncate(struct inode *inode)
1615 {
1616 struct ceph_inode_info *ci = ceph_inode(inode);
1617 u64 to;
1618 int wrbuffer_refs, finish = 0;
1619
1620 mutex_lock(&ci->i_truncate_mutex);
1621 retry:
1622 spin_lock(&ci->i_ceph_lock);
1623 if (ci->i_truncate_pending == 0) {
1624 dout("__do_pending_vmtruncate %p none pending\n", inode);
1625 spin_unlock(&ci->i_ceph_lock);
1626 mutex_unlock(&ci->i_truncate_mutex);
1627 return;
1628 }
1629
1630 /*
1631 * make sure any dirty snapped pages are flushed before we
1632 * possibly truncate them.. so write AND block!
1633 */
1634 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1635 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1636 inode);
1637 spin_unlock(&ci->i_ceph_lock);
1638 filemap_write_and_wait_range(&inode->i_data, 0,
1639 inode->i_sb->s_maxbytes);
1640 goto retry;
1641 }
1642
1643 /* there should be no reader or writer */
1644 WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1645
1646 to = ci->i_truncate_size;
1647 wrbuffer_refs = ci->i_wrbuffer_ref;
1648 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1649 ci->i_truncate_pending, to);
1650 spin_unlock(&ci->i_ceph_lock);
1651
1652 truncate_pagecache(inode, to);
1653
1654 spin_lock(&ci->i_ceph_lock);
1655 if (to == ci->i_truncate_size) {
1656 ci->i_truncate_pending = 0;
1657 finish = 1;
1658 }
1659 spin_unlock(&ci->i_ceph_lock);
1660 if (!finish)
1661 goto retry;
1662
1663 mutex_unlock(&ci->i_truncate_mutex);
1664
1665 if (wrbuffer_refs == 0)
1666 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1667
1668 wake_up_all(&ci->i_cap_wq);
1669 }
1670
1671 /*
1672 * symlinks
1673 */
1674 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1675 {
1676 struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1677 nd_set_link(nd, ci->i_symlink);
1678 return NULL;
1679 }
1680
1681 static const struct inode_operations ceph_symlink_iops = {
1682 .readlink = generic_readlink,
1683 .follow_link = ceph_sym_follow_link,
1684 .setattr = ceph_setattr,
1685 .getattr = ceph_getattr,
1686 .setxattr = ceph_setxattr,
1687 .getxattr = ceph_getxattr,
1688 .listxattr = ceph_listxattr,
1689 .removexattr = ceph_removexattr,
1690 };
1691
1692 /*
1693 * setattr
1694 */
1695 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1696 {
1697 struct inode *inode = dentry->d_inode;
1698 struct ceph_inode_info *ci = ceph_inode(inode);
1699 const unsigned int ia_valid = attr->ia_valid;
1700 struct ceph_mds_request *req;
1701 struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1702 int issued;
1703 int release = 0, dirtied = 0;
1704 int mask = 0;
1705 int err = 0;
1706 int inode_dirty_flags = 0;
1707
1708 if (ceph_snap(inode) != CEPH_NOSNAP)
1709 return -EROFS;
1710
1711 err = inode_change_ok(inode, attr);
1712 if (err != 0)
1713 return err;
1714
1715 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1716 USE_AUTH_MDS);
1717 if (IS_ERR(req))
1718 return PTR_ERR(req);
1719
1720 spin_lock(&ci->i_ceph_lock);
1721 issued = __ceph_caps_issued(ci, NULL);
1722 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1723
1724 if (ia_valid & ATTR_UID) {
1725 dout("setattr %p uid %d -> %d\n", inode,
1726 from_kuid(&init_user_ns, inode->i_uid),
1727 from_kuid(&init_user_ns, attr->ia_uid));
1728 if (issued & CEPH_CAP_AUTH_EXCL) {
1729 inode->i_uid = attr->ia_uid;
1730 dirtied |= CEPH_CAP_AUTH_EXCL;
1731 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1732 !uid_eq(attr->ia_uid, inode->i_uid)) {
1733 req->r_args.setattr.uid = cpu_to_le32(
1734 from_kuid(&init_user_ns, attr->ia_uid));
1735 mask |= CEPH_SETATTR_UID;
1736 release |= CEPH_CAP_AUTH_SHARED;
1737 }
1738 }
1739 if (ia_valid & ATTR_GID) {
1740 dout("setattr %p gid %d -> %d\n", inode,
1741 from_kgid(&init_user_ns, inode->i_gid),
1742 from_kgid(&init_user_ns, attr->ia_gid));
1743 if (issued & CEPH_CAP_AUTH_EXCL) {
1744 inode->i_gid = attr->ia_gid;
1745 dirtied |= CEPH_CAP_AUTH_EXCL;
1746 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1747 !gid_eq(attr->ia_gid, inode->i_gid)) {
1748 req->r_args.setattr.gid = cpu_to_le32(
1749 from_kgid(&init_user_ns, attr->ia_gid));
1750 mask |= CEPH_SETATTR_GID;
1751 release |= CEPH_CAP_AUTH_SHARED;
1752 }
1753 }
1754 if (ia_valid & ATTR_MODE) {
1755 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1756 attr->ia_mode);
1757 if (issued & CEPH_CAP_AUTH_EXCL) {
1758 inode->i_mode = attr->ia_mode;
1759 dirtied |= CEPH_CAP_AUTH_EXCL;
1760 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1761 attr->ia_mode != inode->i_mode) {
1762 inode->i_mode = attr->ia_mode;
1763 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1764 mask |= CEPH_SETATTR_MODE;
1765 release |= CEPH_CAP_AUTH_SHARED;
1766 }
1767 }
1768
1769 if (ia_valid & ATTR_ATIME) {
1770 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1771 inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1772 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1773 if (issued & CEPH_CAP_FILE_EXCL) {
1774 ci->i_time_warp_seq++;
1775 inode->i_atime = attr->ia_atime;
1776 dirtied |= CEPH_CAP_FILE_EXCL;
1777 } else if ((issued & CEPH_CAP_FILE_WR) &&
1778 timespec_compare(&inode->i_atime,
1779 &attr->ia_atime) < 0) {
1780 inode->i_atime = attr->ia_atime;
1781 dirtied |= CEPH_CAP_FILE_WR;
1782 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1783 !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1784 ceph_encode_timespec(&req->r_args.setattr.atime,
1785 &attr->ia_atime);
1786 mask |= CEPH_SETATTR_ATIME;
1787 release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1788 CEPH_CAP_FILE_WR;
1789 }
1790 }
1791 if (ia_valid & ATTR_MTIME) {
1792 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1793 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1794 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1795 if (issued & CEPH_CAP_FILE_EXCL) {
1796 ci->i_time_warp_seq++;
1797 inode->i_mtime = attr->ia_mtime;
1798 dirtied |= CEPH_CAP_FILE_EXCL;
1799 } else if ((issued & CEPH_CAP_FILE_WR) &&
1800 timespec_compare(&inode->i_mtime,
1801 &attr->ia_mtime) < 0) {
1802 inode->i_mtime = attr->ia_mtime;
1803 dirtied |= CEPH_CAP_FILE_WR;
1804 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1805 !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1806 ceph_encode_timespec(&req->r_args.setattr.mtime,
1807 &attr->ia_mtime);
1808 mask |= CEPH_SETATTR_MTIME;
1809 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1810 CEPH_CAP_FILE_WR;
1811 }
1812 }
1813 if (ia_valid & ATTR_SIZE) {
1814 dout("setattr %p size %lld -> %lld\n", inode,
1815 inode->i_size, attr->ia_size);
1816 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1817 err = -EINVAL;
1818 goto out;
1819 }
1820 if ((issued & CEPH_CAP_FILE_EXCL) &&
1821 attr->ia_size > inode->i_size) {
1822 inode->i_size = attr->ia_size;
1823 inode->i_blocks =
1824 (attr->ia_size + (1 << 9) - 1) >> 9;
1825 inode->i_ctime = attr->ia_ctime;
1826 ci->i_reported_size = attr->ia_size;
1827 dirtied |= CEPH_CAP_FILE_EXCL;
1828 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1829 attr->ia_size != inode->i_size) {
1830 req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1831 req->r_args.setattr.old_size =
1832 cpu_to_le64(inode->i_size);
1833 mask |= CEPH_SETATTR_SIZE;
1834 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1835 CEPH_CAP_FILE_WR;
1836 }
1837 }
1838
1839 /* these do nothing */
1840 if (ia_valid & ATTR_CTIME) {
1841 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1842 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1843 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1844 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1845 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1846 only ? "ctime only" : "ignored");
1847 inode->i_ctime = attr->ia_ctime;
1848 if (only) {
1849 /*
1850 * if kernel wants to dirty ctime but nothing else,
1851 * we need to choose a cap to dirty under, or do
1852 * a almost-no-op setattr
1853 */
1854 if (issued & CEPH_CAP_AUTH_EXCL)
1855 dirtied |= CEPH_CAP_AUTH_EXCL;
1856 else if (issued & CEPH_CAP_FILE_EXCL)
1857 dirtied |= CEPH_CAP_FILE_EXCL;
1858 else if (issued & CEPH_CAP_XATTR_EXCL)
1859 dirtied |= CEPH_CAP_XATTR_EXCL;
1860 else
1861 mask |= CEPH_SETATTR_CTIME;
1862 }
1863 }
1864 if (ia_valid & ATTR_FILE)
1865 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1866
1867 if (dirtied) {
1868 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied);
1869 inode->i_ctime = CURRENT_TIME;
1870 }
1871
1872 release &= issued;
1873 spin_unlock(&ci->i_ceph_lock);
1874
1875 if (inode_dirty_flags)
1876 __mark_inode_dirty(inode, inode_dirty_flags);
1877
1878 if (ia_valid & ATTR_MODE) {
1879 err = posix_acl_chmod(inode, attr->ia_mode);
1880 if (err)
1881 goto out_put;
1882 }
1883
1884 if (mask) {
1885 req->r_inode = inode;
1886 ihold(inode);
1887 req->r_inode_drop = release;
1888 req->r_args.setattr.mask = cpu_to_le32(mask);
1889 req->r_num_caps = 1;
1890 err = ceph_mdsc_do_request(mdsc, NULL, req);
1891 }
1892 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1893 ceph_cap_string(dirtied), mask);
1894
1895 ceph_mdsc_put_request(req);
1896 if (mask & CEPH_SETATTR_SIZE)
1897 __ceph_do_pending_vmtruncate(inode);
1898 return err;
1899 out:
1900 spin_unlock(&ci->i_ceph_lock);
1901 out_put:
1902 ceph_mdsc_put_request(req);
1903 return err;
1904 }
1905
1906 /*
1907 * Verify that we have a lease on the given mask. If not,
1908 * do a getattr against an mds.
1909 */
1910 int ceph_do_getattr(struct inode *inode, int mask)
1911 {
1912 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
1913 struct ceph_mds_client *mdsc = fsc->mdsc;
1914 struct ceph_mds_request *req;
1915 int err;
1916
1917 if (ceph_snap(inode) == CEPH_SNAPDIR) {
1918 dout("do_getattr inode %p SNAPDIR\n", inode);
1919 return 0;
1920 }
1921
1922 dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode);
1923 if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1924 return 0;
1925
1926 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1927 if (IS_ERR(req))
1928 return PTR_ERR(req);
1929 req->r_inode = inode;
1930 ihold(inode);
1931 req->r_num_caps = 1;
1932 req->r_args.getattr.mask = cpu_to_le32(mask);
1933 err = ceph_mdsc_do_request(mdsc, NULL, req);
1934 ceph_mdsc_put_request(req);
1935 dout("do_getattr result=%d\n", err);
1936 return err;
1937 }
1938
1939
1940 /*
1941 * Check inode permissions. We verify we have a valid value for
1942 * the AUTH cap, then call the generic handler.
1943 */
1944 int ceph_permission(struct inode *inode, int mask)
1945 {
1946 int err;
1947
1948 if (mask & MAY_NOT_BLOCK)
1949 return -ECHILD;
1950
1951 err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1952
1953 if (!err)
1954 err = generic_permission(inode, mask);
1955 return err;
1956 }
1957
1958 /*
1959 * Get all attributes. Hopefully somedata we'll have a statlite()
1960 * and can limit the fields we require to be accurate.
1961 */
1962 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1963 struct kstat *stat)
1964 {
1965 struct inode *inode = dentry->d_inode;
1966 struct ceph_inode_info *ci = ceph_inode(inode);
1967 int err;
1968
1969 err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1970 if (!err) {
1971 generic_fillattr(inode, stat);
1972 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
1973 if (ceph_snap(inode) != CEPH_NOSNAP)
1974 stat->dev = ceph_snap(inode);
1975 else
1976 stat->dev = 0;
1977 if (S_ISDIR(inode->i_mode)) {
1978 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
1979 RBYTES))
1980 stat->size = ci->i_rbytes;
1981 else
1982 stat->size = ci->i_files + ci->i_subdirs;
1983 stat->blocks = 0;
1984 stat->blksize = 65536;
1985 }
1986 }
1987 return err;
1988 }
Linux with added FPC-III support