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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / fs / ceph / inode.c
blob2c489378b4cd6b470d06ecc9f3c60fc67ea6e1cf
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
13 #include "super.h"
14 #include "mds_client.h"
15 #include <linux/ceph/decode.h>
16
17 /*
18 * Ceph inode operations
19 *
20 * Implement basic inode helpers (get, alloc) and inode ops (getattr,
21 * setattr, etc.), xattr helpers, and helpers for assimilating
22 * metadata returned by the MDS into our cache.
23 *
24 * Also define helpers for doing asynchronous writeback, invalidation,
25 * and truncation for the benefit of those who can't afford to block
26 * (typically because they are in the message handler path).
27 */
28
29 static const struct inode_operations ceph_symlink_iops;
30
31 static void ceph_invalidate_work(struct work_struct *work);
32 static void ceph_writeback_work(struct work_struct *work);
33 static void ceph_vmtruncate_work(struct work_struct *work);
34
35 /*
36 * find or create an inode, given the ceph ino number
37 */
38 static int ceph_set_ino_cb(struct inode *inode, void *data)
39 {
40 ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
41 inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
42 return 0;
43 }
44
45 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
46 {
47 struct inode *inode;
48 ino_t t = ceph_vino_to_ino(vino);
49
50 inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
51 if (inode == NULL)
52 return ERR_PTR(-ENOMEM);
53 if (inode->i_state & I_NEW) {
54 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
55 inode, ceph_vinop(inode), (u64)inode->i_ino);
56 unlock_new_inode(inode);
57 }
58
59 dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
60 vino.snap, inode);
61 return inode;
62 }
63
64 /*
65 * get/constuct snapdir inode for a given directory
66 */
67 struct inode *ceph_get_snapdir(struct inode *parent)
68 {
69 struct ceph_vino vino = {
70 .ino = ceph_ino(parent),
71 .snap = CEPH_SNAPDIR,
72 };
73 struct inode *inode = ceph_get_inode(parent->i_sb, vino);
74 struct ceph_inode_info *ci = ceph_inode(inode);
75
76 BUG_ON(!S_ISDIR(parent->i_mode));
77 if (IS_ERR(inode))
78 return inode;
79 inode->i_mode = parent->i_mode;
80 inode->i_uid = parent->i_uid;
81 inode->i_gid = parent->i_gid;
82 inode->i_op = &ceph_dir_iops;
83 inode->i_fop = &ceph_dir_fops;
84 ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
85 ci->i_rbytes = 0;
86 return inode;
87 }
88
89 const struct inode_operations ceph_file_iops = {
90 .permission = ceph_permission,
91 .setattr = ceph_setattr,
92 .getattr = ceph_getattr,
93 .setxattr = ceph_setxattr,
94 .getxattr = ceph_getxattr,
95 .listxattr = ceph_listxattr,
96 .removexattr = ceph_removexattr,
97 };
98
99
100 /*
101 * We use a 'frag tree' to keep track of the MDS's directory fragments
102 * for a given inode (usually there is just a single fragment). We
103 * need to know when a child frag is delegated to a new MDS, or when
104 * it is flagged as replicated, so we can direct our requests
105 * accordingly.
106 */
107
108 /*
109 * find/create a frag in the tree
110 */
111 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
112 u32 f)
113 {
114 struct rb_node **p;
115 struct rb_node *parent = NULL;
116 struct ceph_inode_frag *frag;
117 int c;
118
119 p = &ci->i_fragtree.rb_node;
120 while (*p) {
121 parent = *p;
122 frag = rb_entry(parent, struct ceph_inode_frag, node);
123 c = ceph_frag_compare(f, frag->frag);
124 if (c < 0)
125 p = &(*p)->rb_left;
126 else if (c > 0)
127 p = &(*p)->rb_right;
128 else
129 return frag;
130 }
131
132 frag = kmalloc(sizeof(*frag), GFP_NOFS);
133 if (!frag) {
134 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
135 "frag %x\n", &ci->vfs_inode,
136 ceph_vinop(&ci->vfs_inode), f);
137 return ERR_PTR(-ENOMEM);
138 }
139 frag->frag = f;
140 frag->split_by = 0;
141 frag->mds = -1;
142 frag->ndist = 0;
143
144 rb_link_node(&frag->node, parent, p);
145 rb_insert_color(&frag->node, &ci->i_fragtree);
146
147 dout("get_or_create_frag added %llx.%llx frag %x\n",
148 ceph_vinop(&ci->vfs_inode), f);
149 return frag;
150 }
151
152 /*
153 * find a specific frag @f
154 */
155 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
156 {
157 struct rb_node *n = ci->i_fragtree.rb_node;
158
159 while (n) {
160 struct ceph_inode_frag *frag =
161 rb_entry(n, struct ceph_inode_frag, node);
162 int c = ceph_frag_compare(f, frag->frag);
163 if (c < 0)
164 n = n->rb_left;
165 else if (c > 0)
166 n = n->rb_right;
167 else
168 return frag;
169 }
170 return NULL;
171 }
172
173 /*
174 * Choose frag containing the given value @v. If @pfrag is
175 * specified, copy the frag delegation info to the caller if
176 * it is present.
177 */
178 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
179 struct ceph_inode_frag *pfrag,
180 int *found)
181 {
182 u32 t = ceph_frag_make(0, 0);
183 struct ceph_inode_frag *frag;
184 unsigned nway, i;
185 u32 n;
186
187 if (found)
188 *found = 0;
189
190 mutex_lock(&ci->i_fragtree_mutex);
191 while (1) {
192 WARN_ON(!ceph_frag_contains_value(t, v));
193 frag = __ceph_find_frag(ci, t);
194 if (!frag)
195 break; /* t is a leaf */
196 if (frag->split_by == 0) {
197 if (pfrag)
198 memcpy(pfrag, frag, sizeof(*pfrag));
199 if (found)
200 *found = 1;
201 break;
202 }
203
204 /* choose child */
205 nway = 1 << frag->split_by;
206 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
207 frag->split_by, nway);
208 for (i = 0; i < nway; i++) {
209 n = ceph_frag_make_child(t, frag->split_by, i);
210 if (ceph_frag_contains_value(n, v)) {
211 t = n;
212 break;
213 }
214 }
215 BUG_ON(i == nway);
216 }
217 dout("choose_frag(%x) = %x\n", v, t);
218
219 mutex_unlock(&ci->i_fragtree_mutex);
220 return t;
221 }
222
223 /*
224 * Process dirfrag (delegation) info from the mds. Include leaf
225 * fragment in tree ONLY if ndist > 0. Otherwise, only
226 * branches/splits are included in i_fragtree)
227 */
228 static int ceph_fill_dirfrag(struct inode *inode,
229 struct ceph_mds_reply_dirfrag *dirinfo)
230 {
231 struct ceph_inode_info *ci = ceph_inode(inode);
232 struct ceph_inode_frag *frag;
233 u32 id = le32_to_cpu(dirinfo->frag);
234 int mds = le32_to_cpu(dirinfo->auth);
235 int ndist = le32_to_cpu(dirinfo->ndist);
236 int i;
237 int err = 0;
238
239 mutex_lock(&ci->i_fragtree_mutex);
240 if (ndist == 0) {
241 /* no delegation info needed. */
242 frag = __ceph_find_frag(ci, id);
243 if (!frag)
244 goto out;
245 if (frag->split_by == 0) {
246 /* tree leaf, remove */
247 dout("fill_dirfrag removed %llx.%llx frag %x"
248 " (no ref)\n", ceph_vinop(inode), id);
249 rb_erase(&frag->node, &ci->i_fragtree);
250 kfree(frag);
251 } else {
252 /* tree branch, keep and clear */
253 dout("fill_dirfrag cleared %llx.%llx frag %x"
254 " referral\n", ceph_vinop(inode), id);
255 frag->mds = -1;
256 frag->ndist = 0;
257 }
258 goto out;
259 }
260
261
262 /* find/add this frag to store mds delegation info */
263 frag = __get_or_create_frag(ci, id);
264 if (IS_ERR(frag)) {
265 /* this is not the end of the world; we can continue
266 with bad/inaccurate delegation info */
267 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
268 ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
269 err = -ENOMEM;
270 goto out;
271 }
272
273 frag->mds = mds;
274 frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
275 for (i = 0; i < frag->ndist; i++)
276 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
277 dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
278 ceph_vinop(inode), frag->frag, frag->ndist);
279
280 out:
281 mutex_unlock(&ci->i_fragtree_mutex);
282 return err;
283 }
284
285
286 /*
287 * initialize a newly allocated inode.
288 */
289 struct inode *ceph_alloc_inode(struct super_block *sb)
290 {
291 struct ceph_inode_info *ci;
292 int i;
293
294 ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
295 if (!ci)
296 return NULL;
297
298 dout("alloc_inode %p\n", &ci->vfs_inode);
299
300 spin_lock_init(&ci->i_ceph_lock);
301
302 ci->i_version = 0;
303 ci->i_time_warp_seq = 0;
304 ci->i_ceph_flags = 0;
305 ci->i_release_count = 0;
306 ci->i_symlink = NULL;
307
308 memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
309
310 ci->i_fragtree = RB_ROOT;
311 mutex_init(&ci->i_fragtree_mutex);
312
313 ci->i_xattrs.blob = NULL;
314 ci->i_xattrs.prealloc_blob = NULL;
315 ci->i_xattrs.dirty = false;
316 ci->i_xattrs.index = RB_ROOT;
317 ci->i_xattrs.count = 0;
318 ci->i_xattrs.names_size = 0;
319 ci->i_xattrs.vals_size = 0;
320 ci->i_xattrs.version = 0;
321 ci->i_xattrs.index_version = 0;
322
323 ci->i_caps = RB_ROOT;
324 ci->i_auth_cap = NULL;
325 ci->i_dirty_caps = 0;
326 ci->i_flushing_caps = 0;
327 INIT_LIST_HEAD(&ci->i_dirty_item);
328 INIT_LIST_HEAD(&ci->i_flushing_item);
329 ci->i_cap_flush_seq = 0;
330 ci->i_cap_flush_last_tid = 0;
331 memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
332 init_waitqueue_head(&ci->i_cap_wq);
333 ci->i_hold_caps_min = 0;
334 ci->i_hold_caps_max = 0;
335 INIT_LIST_HEAD(&ci->i_cap_delay_list);
336 ci->i_cap_exporting_mds = 0;
337 ci->i_cap_exporting_mseq = 0;
338 ci->i_cap_exporting_issued = 0;
339 INIT_LIST_HEAD(&ci->i_cap_snaps);
340 ci->i_head_snapc = NULL;
341 ci->i_snap_caps = 0;
342
343 for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
344 ci->i_nr_by_mode[i] = 0;
345
346 ci->i_truncate_seq = 0;
347 ci->i_truncate_size = 0;
348 ci->i_truncate_pending = 0;
349
350 ci->i_max_size = 0;
351 ci->i_reported_size = 0;
352 ci->i_wanted_max_size = 0;
353 ci->i_requested_max_size = 0;
354
355 ci->i_pin_ref = 0;
356 ci->i_rd_ref = 0;
357 ci->i_rdcache_ref = 0;
358 ci->i_wr_ref = 0;
359 ci->i_wb_ref = 0;
360 ci->i_wrbuffer_ref = 0;
361 ci->i_wrbuffer_ref_head = 0;
362 ci->i_shared_gen = 0;
363 ci->i_rdcache_gen = 0;
364 ci->i_rdcache_revoking = 0;
365
366 INIT_LIST_HEAD(&ci->i_unsafe_writes);
367 INIT_LIST_HEAD(&ci->i_unsafe_dirops);
368 spin_lock_init(&ci->i_unsafe_lock);
369
370 ci->i_snap_realm = NULL;
371 INIT_LIST_HEAD(&ci->i_snap_realm_item);
372 INIT_LIST_HEAD(&ci->i_snap_flush_item);
373
374 INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
375 INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
376
377 INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
378
379 return &ci->vfs_inode;
380 }
381
382 static void ceph_i_callback(struct rcu_head *head)
383 {
384 struct inode *inode = container_of(head, struct inode, i_rcu);
385 struct ceph_inode_info *ci = ceph_inode(inode);
386
387 kmem_cache_free(ceph_inode_cachep, ci);
388 }
389
390 void ceph_destroy_inode(struct inode *inode)
391 {
392 struct ceph_inode_info *ci = ceph_inode(inode);
393 struct ceph_inode_frag *frag;
394 struct rb_node *n;
395
396 dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
397
398 ceph_queue_caps_release(inode);
399
400 /*
401 * we may still have a snap_realm reference if there are stray
402 * caps in i_cap_exporting_issued or i_snap_caps.
403 */
404 if (ci->i_snap_realm) {
405 struct ceph_mds_client *mdsc =
406 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
407 struct ceph_snap_realm *realm = ci->i_snap_realm;
408
409 dout(" dropping residual ref to snap realm %p\n", realm);
410 spin_lock(&realm->inodes_with_caps_lock);
411 list_del_init(&ci->i_snap_realm_item);
412 spin_unlock(&realm->inodes_with_caps_lock);
413 ceph_put_snap_realm(mdsc, realm);
414 }
415
416 kfree(ci->i_symlink);
417 while ((n = rb_first(&ci->i_fragtree)) != NULL) {
418 frag = rb_entry(n, struct ceph_inode_frag, node);
419 rb_erase(n, &ci->i_fragtree);
420 kfree(frag);
421 }
422
423 __ceph_destroy_xattrs(ci);
424 if (ci->i_xattrs.blob)
425 ceph_buffer_put(ci->i_xattrs.blob);
426 if (ci->i_xattrs.prealloc_blob)
427 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
428
429 call_rcu(&inode->i_rcu, ceph_i_callback);
430 }
431
432
433 /*
434 * Helpers to fill in size, ctime, mtime, and atime. We have to be
435 * careful because either the client or MDS may have more up to date
436 * info, depending on which capabilities are held, and whether
437 * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime
438 * and size are monotonically increasing, except when utimes() or
439 * truncate() increments the corresponding _seq values.)
440 */
441 int ceph_fill_file_size(struct inode *inode, int issued,
442 u32 truncate_seq, u64 truncate_size, u64 size)
443 {
444 struct ceph_inode_info *ci = ceph_inode(inode);
445 int queue_trunc = 0;
446
447 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
448 (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
449 dout("size %lld -> %llu\n", inode->i_size, size);
450 inode->i_size = size;
451 inode->i_blocks = (size + (1<<9) - 1) >> 9;
452 ci->i_reported_size = size;
453 if (truncate_seq != ci->i_truncate_seq) {
454 dout("truncate_seq %u -> %u\n",
455 ci->i_truncate_seq, truncate_seq);
456 ci->i_truncate_seq = truncate_seq;
457 /*
458 * If we hold relevant caps, or in the case where we're
459 * not the only client referencing this file and we
460 * don't hold those caps, then we need to check whether
461 * the file is either opened or mmaped
462 */
463 if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_RD|
464 CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER|
465 CEPH_CAP_FILE_EXCL|
466 CEPH_CAP_FILE_LAZYIO)) ||
467 mapping_mapped(inode->i_mapping) ||
468 __ceph_caps_file_wanted(ci)) {
469 ci->i_truncate_pending++;
470 queue_trunc = 1;
471 }
472 }
473 }
474 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
475 ci->i_truncate_size != truncate_size) {
476 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
477 truncate_size);
478 ci->i_truncate_size = truncate_size;
479 }
480 return queue_trunc;
481 }
482
483 void ceph_fill_file_time(struct inode *inode, int issued,
484 u64 time_warp_seq, struct timespec *ctime,
485 struct timespec *mtime, struct timespec *atime)
486 {
487 struct ceph_inode_info *ci = ceph_inode(inode);
488 int warn = 0;
489
490 if (issued & (CEPH_CAP_FILE_EXCL|
491 CEPH_CAP_FILE_WR|
492 CEPH_CAP_FILE_BUFFER|
493 CEPH_CAP_AUTH_EXCL|
494 CEPH_CAP_XATTR_EXCL)) {
495 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
496 dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
497 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
498 ctime->tv_sec, ctime->tv_nsec);
499 inode->i_ctime = *ctime;
500 }
501 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
502 /* the MDS did a utimes() */
503 dout("mtime %ld.%09ld -> %ld.%09ld "
504 "tw %d -> %d\n",
505 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
506 mtime->tv_sec, mtime->tv_nsec,
507 ci->i_time_warp_seq, (int)time_warp_seq);
508
509 inode->i_mtime = *mtime;
510 inode->i_atime = *atime;
511 ci->i_time_warp_seq = time_warp_seq;
512 } else if (time_warp_seq == ci->i_time_warp_seq) {
513 /* nobody did utimes(); take the max */
514 if (timespec_compare(mtime, &inode->i_mtime) > 0) {
515 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
516 inode->i_mtime.tv_sec,
517 inode->i_mtime.tv_nsec,
518 mtime->tv_sec, mtime->tv_nsec);
519 inode->i_mtime = *mtime;
520 }
521 if (timespec_compare(atime, &inode->i_atime) > 0) {
522 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
523 inode->i_atime.tv_sec,
524 inode->i_atime.tv_nsec,
525 atime->tv_sec, atime->tv_nsec);
526 inode->i_atime = *atime;
527 }
528 } else if (issued & CEPH_CAP_FILE_EXCL) {
529 /* we did a utimes(); ignore mds values */
530 } else {
531 warn = 1;
532 }
533 } else {
534 /* we have no write|excl caps; whatever the MDS says is true */
535 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
536 inode->i_ctime = *ctime;
537 inode->i_mtime = *mtime;
538 inode->i_atime = *atime;
539 ci->i_time_warp_seq = time_warp_seq;
540 } else {
541 warn = 1;
542 }
543 }
544 if (warn) /* time_warp_seq shouldn't go backwards */
545 dout("%p mds time_warp_seq %llu < %u\n",
546 inode, time_warp_seq, ci->i_time_warp_seq);
547 }
548
549 /*
550 * Populate an inode based on info from mds. May be called on new or
551 * existing inodes.
552 */
553 static int fill_inode(struct inode *inode,
554 struct ceph_mds_reply_info_in *iinfo,
555 struct ceph_mds_reply_dirfrag *dirinfo,
556 struct ceph_mds_session *session,
557 unsigned long ttl_from, int cap_fmode,
558 struct ceph_cap_reservation *caps_reservation)
559 {
560 struct ceph_mds_reply_inode *info = iinfo->in;
561 struct ceph_inode_info *ci = ceph_inode(inode);
562 int i;
563 int issued = 0, implemented;
564 int updating_inode = 0;
565 struct timespec mtime, atime, ctime;
566 u32 nsplits;
567 struct ceph_buffer *xattr_blob = NULL;
568 int err = 0;
569 int queue_trunc = 0;
570
571 dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
572 inode, ceph_vinop(inode), le64_to_cpu(info->version),
573 ci->i_version);
574
575 /*
576 * prealloc xattr data, if it looks like we'll need it. only
577 * if len > 4 (meaning there are actually xattrs; the first 4
578 * bytes are the xattr count).
579 */
580 if (iinfo->xattr_len > 4) {
581 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
582 if (!xattr_blob)
583 pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
584 iinfo->xattr_len);
585 }
586
587 spin_lock(&ci->i_ceph_lock);
588
589 /*
590 * provided version will be odd if inode value is projected,
591 * even if stable. skip the update if we have newer stable
592 * info (ours>=theirs, e.g. due to racing mds replies), unless
593 * we are getting projected (unstable) info (in which case the
594 * version is odd, and we want ours>theirs).
595 * us them
596 * 2 2 skip
597 * 3 2 skip
598 * 3 3 update
599 */
600 if (le64_to_cpu(info->version) > 0 &&
601 (ci->i_version & ~1) >= le64_to_cpu(info->version))
602 goto no_change;
603
604 updating_inode = 1;
605 issued = __ceph_caps_issued(ci, &implemented);
606 issued |= implemented | __ceph_caps_dirty(ci);
607
608 /* update inode */
609 ci->i_version = le64_to_cpu(info->version);
610 inode->i_version++;
611 inode->i_rdev = le32_to_cpu(info->rdev);
612
613 if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
614 inode->i_mode = le32_to_cpu(info->mode);
615 inode->i_uid = le32_to_cpu(info->uid);
616 inode->i_gid = le32_to_cpu(info->gid);
617 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
618 inode->i_uid, inode->i_gid);
619 }
620
621 if ((issued & CEPH_CAP_LINK_EXCL) == 0)
622 set_nlink(inode, le32_to_cpu(info->nlink));
623
624 /* be careful with mtime, atime, size */
625 ceph_decode_timespec(&atime, &info->atime);
626 ceph_decode_timespec(&mtime, &info->mtime);
627 ceph_decode_timespec(&ctime, &info->ctime);
628 queue_trunc = ceph_fill_file_size(inode, issued,
629 le32_to_cpu(info->truncate_seq),
630 le64_to_cpu(info->truncate_size),
631 le64_to_cpu(info->size));
632 ceph_fill_file_time(inode, issued,
633 le32_to_cpu(info->time_warp_seq),
634 &ctime, &mtime, &atime);
635
636 /* only update max_size on auth cap */
637 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
638 ci->i_max_size != le64_to_cpu(info->max_size)) {
639 dout("max_size %lld -> %llu\n", ci->i_max_size,
640 le64_to_cpu(info->max_size));
641 ci->i_max_size = le64_to_cpu(info->max_size);
642 }
643
644 ci->i_layout = info->layout;
645 inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
646
647 /* xattrs */
648 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
649 if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
650 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
651 if (ci->i_xattrs.blob)
652 ceph_buffer_put(ci->i_xattrs.blob);
653 ci->i_xattrs.blob = xattr_blob;
654 if (xattr_blob)
655 memcpy(ci->i_xattrs.blob->vec.iov_base,
656 iinfo->xattr_data, iinfo->xattr_len);
657 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
658 xattr_blob = NULL;
659 }
660
661 inode->i_mapping->a_ops = &ceph_aops;
662 inode->i_mapping->backing_dev_info =
663 &ceph_sb_to_client(inode->i_sb)->backing_dev_info;
664
665 switch (inode->i_mode & S_IFMT) {
666 case S_IFIFO:
667 case S_IFBLK:
668 case S_IFCHR:
669 case S_IFSOCK:
670 init_special_inode(inode, inode->i_mode, inode->i_rdev);
671 inode->i_op = &ceph_file_iops;
672 break;
673 case S_IFREG:
674 inode->i_op = &ceph_file_iops;
675 inode->i_fop = &ceph_file_fops;
676 break;
677 case S_IFLNK:
678 inode->i_op = &ceph_symlink_iops;
679 if (!ci->i_symlink) {
680 int symlen = iinfo->symlink_len;
681 char *sym;
682
683 BUG_ON(symlen != inode->i_size);
684 spin_unlock(&ci->i_ceph_lock);
685
686 err = -ENOMEM;
687 sym = kmalloc(symlen+1, GFP_NOFS);
688 if (!sym)
689 goto out;
690 memcpy(sym, iinfo->symlink, symlen);
691 sym[symlen] = 0;
692
693 spin_lock(&ci->i_ceph_lock);
694 if (!ci->i_symlink)
695 ci->i_symlink = sym;
696 else
697 kfree(sym); /* lost a race */
698 }
699 break;
700 case S_IFDIR:
701 inode->i_op = &ceph_dir_iops;
702 inode->i_fop = &ceph_dir_fops;
703
704 ci->i_dir_layout = iinfo->dir_layout;
705
706 ci->i_files = le64_to_cpu(info->files);
707 ci->i_subdirs = le64_to_cpu(info->subdirs);
708 ci->i_rbytes = le64_to_cpu(info->rbytes);
709 ci->i_rfiles = le64_to_cpu(info->rfiles);
710 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
711 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
712 break;
713 default:
714 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
715 ceph_vinop(inode), inode->i_mode);
716 }
717
718 no_change:
719 spin_unlock(&ci->i_ceph_lock);
720
721 /* queue truncate if we saw i_size decrease */
722 if (queue_trunc)
723 ceph_queue_vmtruncate(inode);
724
725 /* populate frag tree */
726 /* FIXME: move me up, if/when version reflects fragtree changes */
727 nsplits = le32_to_cpu(info->fragtree.nsplits);
728 mutex_lock(&ci->i_fragtree_mutex);
729 for (i = 0; i < nsplits; i++) {
730 u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
731 struct ceph_inode_frag *frag = __get_or_create_frag(ci, id);
732
733 if (IS_ERR(frag))
734 continue;
735 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
736 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
737 }
738 mutex_unlock(&ci->i_fragtree_mutex);
739
740 /* were we issued a capability? */
741 if (info->cap.caps) {
742 if (ceph_snap(inode) == CEPH_NOSNAP) {
743 ceph_add_cap(inode, session,
744 le64_to_cpu(info->cap.cap_id),
745 cap_fmode,
746 le32_to_cpu(info->cap.caps),
747 le32_to_cpu(info->cap.wanted),
748 le32_to_cpu(info->cap.seq),
749 le32_to_cpu(info->cap.mseq),
750 le64_to_cpu(info->cap.realm),
751 info->cap.flags,
752 caps_reservation);
753 } else {
754 spin_lock(&ci->i_ceph_lock);
755 dout(" %p got snap_caps %s\n", inode,
756 ceph_cap_string(le32_to_cpu(info->cap.caps)));
757 ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
758 if (cap_fmode >= 0)
759 __ceph_get_fmode(ci, cap_fmode);
760 spin_unlock(&ci->i_ceph_lock);
761 }
762 } else if (cap_fmode >= 0) {
763 pr_warning("mds issued no caps on %llx.%llx\n",
764 ceph_vinop(inode));
765 __ceph_get_fmode(ci, cap_fmode);
766 }
767
768 /* set dir completion flag? */
769 if (S_ISDIR(inode->i_mode) &&
770 updating_inode && /* didn't jump to no_change */
771 ci->i_files == 0 && ci->i_subdirs == 0 &&
772 ceph_snap(inode) == CEPH_NOSNAP &&
773 (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
774 (issued & CEPH_CAP_FILE_EXCL) == 0 &&
775 !ceph_dir_test_complete(inode)) {
776 dout(" marking %p complete (empty)\n", inode);
777 ceph_dir_set_complete(inode);
778 ci->i_max_offset = 2;
779 }
780
781 /* update delegation info? */
782 if (dirinfo)
783 ceph_fill_dirfrag(inode, dirinfo);
784
785 err = 0;
786
787 out:
788 if (xattr_blob)
789 ceph_buffer_put(xattr_blob);
790 return err;
791 }
792
793 /*
794 * caller should hold session s_mutex.
795 */
796 static void update_dentry_lease(struct dentry *dentry,
797 struct ceph_mds_reply_lease *lease,
798 struct ceph_mds_session *session,
799 unsigned long from_time)
800 {
801 struct ceph_dentry_info *di = ceph_dentry(dentry);
802 long unsigned duration = le32_to_cpu(lease->duration_ms);
803 long unsigned ttl = from_time + (duration * HZ) / 1000;
804 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
805 struct inode *dir;
806
807 /* only track leases on regular dentries */
808 if (dentry->d_op != &ceph_dentry_ops)
809 return;
810
811 spin_lock(&dentry->d_lock);
812 dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
813 dentry, duration, ttl);
814
815 /* make lease_rdcache_gen match directory */
816 dir = dentry->d_parent->d_inode;
817 di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
818
819 if (duration == 0)
820 goto out_unlock;
821
822 if (di->lease_gen == session->s_cap_gen &&
823 time_before(ttl, dentry->d_time))
824 goto out_unlock; /* we already have a newer lease. */
825
826 if (di->lease_session && di->lease_session != session)
827 goto out_unlock;
828
829 ceph_dentry_lru_touch(dentry);
830
831 if (!di->lease_session)
832 di->lease_session = ceph_get_mds_session(session);
833 di->lease_gen = session->s_cap_gen;
834 di->lease_seq = le32_to_cpu(lease->seq);
835 di->lease_renew_after = half_ttl;
836 di->lease_renew_from = 0;
837 dentry->d_time = ttl;
838 out_unlock:
839 spin_unlock(&dentry->d_lock);
840 return;
841 }
842
843 /*
844 * Set dentry's directory position based on the current dir's max, and
845 * order it in d_subdirs, so that dcache_readdir behaves.
846 *
847 * Always called under directory's i_mutex.
848 */
849 static void ceph_set_dentry_offset(struct dentry *dn)
850 {
851 struct dentry *dir = dn->d_parent;
852 struct inode *inode = dir->d_inode;
853 struct ceph_inode_info *ci;
854 struct ceph_dentry_info *di;
855
856 BUG_ON(!inode);
857
858 ci = ceph_inode(inode);
859 di = ceph_dentry(dn);
860
861 spin_lock(&ci->i_ceph_lock);
862 if (!ceph_dir_test_complete(inode)) {
863 spin_unlock(&ci->i_ceph_lock);
864 return;
865 }
866 di->offset = ceph_inode(inode)->i_max_offset++;
867 spin_unlock(&ci->i_ceph_lock);
868
869 spin_lock(&dir->d_lock);
870 spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
871 list_move(&dn->d_u.d_child, &dir->d_subdirs);
872 dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
873 dn->d_u.d_child.prev, dn->d_u.d_child.next);
874 spin_unlock(&dn->d_lock);
875 spin_unlock(&dir->d_lock);
876 }
877
878 /*
879 * splice a dentry to an inode.
880 * caller must hold directory i_mutex for this to be safe.
881 *
882 * we will only rehash the resulting dentry if @prehash is
883 * true; @prehash will be set to false (for the benefit of
884 * the caller) if we fail.
885 */
886 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
887 bool *prehash, bool set_offset)
888 {
889 struct dentry *realdn;
890
891 BUG_ON(dn->d_inode);
892
893 /* dn must be unhashed */
894 if (!d_unhashed(dn))
895 d_drop(dn);
896 realdn = d_materialise_unique(dn, in);
897 if (IS_ERR(realdn)) {
898 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
899 PTR_ERR(realdn), dn, in, ceph_vinop(in));
900 if (prehash)
901 *prehash = false; /* don't rehash on error */
902 dn = realdn; /* note realdn contains the error */
903 goto out;
904 } else if (realdn) {
905 dout("dn %p (%d) spliced with %p (%d) "
906 "inode %p ino %llx.%llx\n",
907 dn, dn->d_count,
908 realdn, realdn->d_count,
909 realdn->d_inode, ceph_vinop(realdn->d_inode));
910 dput(dn);
911 dn = realdn;
912 } else {
913 BUG_ON(!ceph_dentry(dn));
914 dout("dn %p attached to %p ino %llx.%llx\n",
915 dn, dn->d_inode, ceph_vinop(dn->d_inode));
916 }
917 if ((!prehash || *prehash) && d_unhashed(dn))
918 d_rehash(dn);
919 if (set_offset)
920 ceph_set_dentry_offset(dn);
921 out:
922 return dn;
923 }
924
925 /*
926 * Incorporate results into the local cache. This is either just
927 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
928 * after a lookup).
929 *
930 * A reply may contain
931 * a directory inode along with a dentry.
932 * and/or a target inode
933 *
934 * Called with snap_rwsem (read).
935 */
936 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
937 struct ceph_mds_session *session)
938 {
939 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
940 struct inode *in = NULL;
941 struct ceph_mds_reply_inode *ininfo;
942 struct ceph_vino vino;
943 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
944 int i = 0;
945 int err = 0;
946
947 dout("fill_trace %p is_dentry %d is_target %d\n", req,
948 rinfo->head->is_dentry, rinfo->head->is_target);
949
950 #if 0
951 /*
952 * Debugging hook:
953 *
954 * If we resend completed ops to a recovering mds, we get no
955 * trace. Since that is very rare, pretend this is the case
956 * to ensure the 'no trace' handlers in the callers behave.
957 *
958 * Fill in inodes unconditionally to avoid breaking cap
959 * invariants.
960 */
961 if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
962 pr_info("fill_trace faking empty trace on %lld %s\n",
963 req->r_tid, ceph_mds_op_name(rinfo->head->op));
964 if (rinfo->head->is_dentry) {
965 rinfo->head->is_dentry = 0;
966 err = fill_inode(req->r_locked_dir,
967 &rinfo->diri, rinfo->dirfrag,
968 session, req->r_request_started, -1);
969 }
970 if (rinfo->head->is_target) {
971 rinfo->head->is_target = 0;
972 ininfo = rinfo->targeti.in;
973 vino.ino = le64_to_cpu(ininfo->ino);
974 vino.snap = le64_to_cpu(ininfo->snapid);
975 in = ceph_get_inode(sb, vino);
976 err = fill_inode(in, &rinfo->targeti, NULL,
977 session, req->r_request_started,
978 req->r_fmode);
979 iput(in);
980 }
981 }
982 #endif
983
984 if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
985 dout("fill_trace reply is empty!\n");
986 if (rinfo->head->result == 0 && req->r_locked_dir)
987 ceph_invalidate_dir_request(req);
988 return 0;
989 }
990
991 if (rinfo->head->is_dentry) {
992 struct inode *dir = req->r_locked_dir;
993
994 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
995 session, req->r_request_started, -1,
996 &req->r_caps_reservation);
997 if (err < 0)
998 return err;
999 }
1000
1001 /*
1002 * ignore null lease/binding on snapdir ENOENT, or else we
1003 * will have trouble splicing in the virtual snapdir later
1004 */
1005 if (rinfo->head->is_dentry && !req->r_aborted &&
1006 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1007 fsc->mount_options->snapdir_name,
1008 req->r_dentry->d_name.len))) {
1009 /*
1010 * lookup link rename : null -> possibly existing inode
1011 * mknod symlink mkdir : null -> new inode
1012 * unlink : linked -> null
1013 */
1014 struct inode *dir = req->r_locked_dir;
1015 struct dentry *dn = req->r_dentry;
1016 bool have_dir_cap, have_lease;
1017
1018 BUG_ON(!dn);
1019 BUG_ON(!dir);
1020 BUG_ON(dn->d_parent->d_inode != dir);
1021 BUG_ON(ceph_ino(dir) !=
1022 le64_to_cpu(rinfo->diri.in->ino));
1023 BUG_ON(ceph_snap(dir) !=
1024 le64_to_cpu(rinfo->diri.in->snapid));
1025
1026 /* do we have a lease on the whole dir? */
1027 have_dir_cap =
1028 (le32_to_cpu(rinfo->diri.in->cap.caps) &
1029 CEPH_CAP_FILE_SHARED);
1030
1031 /* do we have a dn lease? */
1032 have_lease = have_dir_cap ||
1033 le32_to_cpu(rinfo->dlease->duration_ms);
1034 if (!have_lease)
1035 dout("fill_trace no dentry lease or dir cap\n");
1036
1037 /* rename? */
1038 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1039 dout(" src %p '%.*s' dst %p '%.*s'\n",
1040 req->r_old_dentry,
1041 req->r_old_dentry->d_name.len,
1042 req->r_old_dentry->d_name.name,
1043 dn, dn->d_name.len, dn->d_name.name);
1044 dout("fill_trace doing d_move %p -> %p\n",
1045 req->r_old_dentry, dn);
1046
1047 d_move(req->r_old_dentry, dn);
1048 dout(" src %p '%.*s' dst %p '%.*s'\n",
1049 req->r_old_dentry,
1050 req->r_old_dentry->d_name.len,
1051 req->r_old_dentry->d_name.name,
1052 dn, dn->d_name.len, dn->d_name.name);
1053
1054 /* ensure target dentry is invalidated, despite
1055 rehashing bug in vfs_rename_dir */
1056 ceph_invalidate_dentry_lease(dn);
1057
1058 /*
1059 * d_move() puts the renamed dentry at the end of
1060 * d_subdirs. We need to assign it an appropriate
1061 * directory offset so we can behave when holding
1062 * D_COMPLETE.
1063 */
1064 ceph_set_dentry_offset(req->r_old_dentry);
1065 dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1066 ceph_dentry(req->r_old_dentry)->offset);
1067
1068 dn = req->r_old_dentry; /* use old_dentry */
1069 in = dn->d_inode;
1070 }
1071
1072 /* null dentry? */
1073 if (!rinfo->head->is_target) {
1074 dout("fill_trace null dentry\n");
1075 if (dn->d_inode) {
1076 dout("d_delete %p\n", dn);
1077 d_delete(dn);
1078 } else {
1079 dout("d_instantiate %p NULL\n", dn);
1080 d_instantiate(dn, NULL);
1081 if (have_lease && d_unhashed(dn))
1082 d_rehash(dn);
1083 update_dentry_lease(dn, rinfo->dlease,
1084 session,
1085 req->r_request_started);
1086 }
1087 goto done;
1088 }
1089
1090 /* attach proper inode */
1091 ininfo = rinfo->targeti.in;
1092 vino.ino = le64_to_cpu(ininfo->ino);
1093 vino.snap = le64_to_cpu(ininfo->snapid);
1094 in = dn->d_inode;
1095 if (!in) {
1096 in = ceph_get_inode(sb, vino);
1097 if (IS_ERR(in)) {
1098 pr_err("fill_trace bad get_inode "
1099 "%llx.%llx\n", vino.ino, vino.snap);
1100 err = PTR_ERR(in);
1101 d_delete(dn);
1102 goto done;
1103 }
1104 dn = splice_dentry(dn, in, &have_lease, true);
1105 if (IS_ERR(dn)) {
1106 err = PTR_ERR(dn);
1107 goto done;
1108 }
1109 req->r_dentry = dn; /* may have spliced */
1110 ihold(in);
1111 } else if (ceph_ino(in) == vino.ino &&
1112 ceph_snap(in) == vino.snap) {
1113 ihold(in);
1114 } else {
1115 dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1116 dn, in, ceph_ino(in), ceph_snap(in),
1117 vino.ino, vino.snap);
1118 have_lease = false;
1119 in = NULL;
1120 }
1121
1122 if (have_lease)
1123 update_dentry_lease(dn, rinfo->dlease, session,
1124 req->r_request_started);
1125 dout(" final dn %p\n", dn);
1126 i++;
1127 } else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1128 req->r_op == CEPH_MDS_OP_MKSNAP) {
1129 struct dentry *dn = req->r_dentry;
1130
1131 /* fill out a snapdir LOOKUPSNAP dentry */
1132 BUG_ON(!dn);
1133 BUG_ON(!req->r_locked_dir);
1134 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1135 ininfo = rinfo->targeti.in;
1136 vino.ino = le64_to_cpu(ininfo->ino);
1137 vino.snap = le64_to_cpu(ininfo->snapid);
1138 in = ceph_get_inode(sb, vino);
1139 if (IS_ERR(in)) {
1140 pr_err("fill_inode get_inode badness %llx.%llx\n",
1141 vino.ino, vino.snap);
1142 err = PTR_ERR(in);
1143 d_delete(dn);
1144 goto done;
1145 }
1146 dout(" linking snapped dir %p to dn %p\n", in, dn);
1147 dn = splice_dentry(dn, in, NULL, true);
1148 if (IS_ERR(dn)) {
1149 err = PTR_ERR(dn);
1150 goto done;
1151 }
1152 req->r_dentry = dn; /* may have spliced */
1153 ihold(in);
1154 rinfo->head->is_dentry = 1; /* fool notrace handlers */
1155 }
1156
1157 if (rinfo->head->is_target) {
1158 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1159 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1160
1161 if (in == NULL || ceph_ino(in) != vino.ino ||
1162 ceph_snap(in) != vino.snap) {
1163 in = ceph_get_inode(sb, vino);
1164 if (IS_ERR(in)) {
1165 err = PTR_ERR(in);
1166 goto done;
1167 }
1168 }
1169 req->r_target_inode = in;
1170
1171 err = fill_inode(in,
1172 &rinfo->targeti, NULL,
1173 session, req->r_request_started,
1174 (le32_to_cpu(rinfo->head->result) == 0) ?
1175 req->r_fmode : -1,
1176 &req->r_caps_reservation);
1177 if (err < 0) {
1178 pr_err("fill_inode badness %p %llx.%llx\n",
1179 in, ceph_vinop(in));
1180 goto done;
1181 }
1182 }
1183
1184 done:
1185 dout("fill_trace done err=%d\n", err);
1186 return err;
1187 }
1188
1189 /*
1190 * Prepopulate our cache with readdir results, leases, etc.
1191 */
1192 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1193 struct ceph_mds_session *session)
1194 {
1195 struct dentry *parent = req->r_dentry;
1196 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1197 struct qstr dname;
1198 struct dentry *dn;
1199 struct inode *in;
1200 int err = 0, i;
1201 struct inode *snapdir = NULL;
1202 struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1203 u64 frag = le32_to_cpu(rhead->args.readdir.frag);
1204 struct ceph_dentry_info *di;
1205
1206 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1207 snapdir = ceph_get_snapdir(parent->d_inode);
1208 parent = d_find_alias(snapdir);
1209 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1210 rinfo->dir_nr, parent);
1211 } else {
1212 dout("readdir_prepopulate %d items under dn %p\n",
1213 rinfo->dir_nr, parent);
1214 if (rinfo->dir_dir)
1215 ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1216 }
1217
1218 for (i = 0; i < rinfo->dir_nr; i++) {
1219 struct ceph_vino vino;
1220
1221 dname.name = rinfo->dir_dname[i];
1222 dname.len = rinfo->dir_dname_len[i];
1223 dname.hash = full_name_hash(dname.name, dname.len);
1224
1225 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1226 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1227
1228 retry_lookup:
1229 dn = d_lookup(parent, &dname);
1230 dout("d_lookup on parent=%p name=%.*s got %p\n",
1231 parent, dname.len, dname.name, dn);
1232
1233 if (!dn) {
1234 dn = d_alloc(parent, &dname);
1235 dout("d_alloc %p '%.*s' = %p\n", parent,
1236 dname.len, dname.name, dn);
1237 if (dn == NULL) {
1238 dout("d_alloc badness\n");
1239 err = -ENOMEM;
1240 goto out;
1241 }
1242 err = ceph_init_dentry(dn);
1243 if (err < 0) {
1244 dput(dn);
1245 goto out;
1246 }
1247 } else if (dn->d_inode &&
1248 (ceph_ino(dn->d_inode) != vino.ino ||
1249 ceph_snap(dn->d_inode) != vino.snap)) {
1250 dout(" dn %p points to wrong inode %p\n",
1251 dn, dn->d_inode);
1252 d_delete(dn);
1253 dput(dn);
1254 goto retry_lookup;
1255 } else {
1256 /* reorder parent's d_subdirs */
1257 spin_lock(&parent->d_lock);
1258 spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
1259 list_move(&dn->d_u.d_child, &parent->d_subdirs);
1260 spin_unlock(&dn->d_lock);
1261 spin_unlock(&parent->d_lock);
1262 }
1263
1264 di = dn->d_fsdata;
1265 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1266
1267 /* inode */
1268 if (dn->d_inode) {
1269 in = dn->d_inode;
1270 } else {
1271 in = ceph_get_inode(parent->d_sb, vino);
1272 if (IS_ERR(in)) {
1273 dout("new_inode badness\n");
1274 d_delete(dn);
1275 dput(dn);
1276 err = PTR_ERR(in);
1277 goto out;
1278 }
1279 dn = splice_dentry(dn, in, NULL, false);
1280 if (IS_ERR(dn))
1281 dn = NULL;
1282 }
1283
1284 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1285 req->r_request_started, -1,
1286 &req->r_caps_reservation) < 0) {
1287 pr_err("fill_inode badness on %p\n", in);
1288 goto next_item;
1289 }
1290 if (dn)
1291 update_dentry_lease(dn, rinfo->dir_dlease[i],
1292 req->r_session,
1293 req->r_request_started);
1294 next_item:
1295 if (dn)
1296 dput(dn);
1297 }
1298 req->r_did_prepopulate = true;
1299
1300 out:
1301 if (snapdir) {
1302 iput(snapdir);
1303 dput(parent);
1304 }
1305 dout("readdir_prepopulate done\n");
1306 return err;
1307 }
1308
1309 int ceph_inode_set_size(struct inode *inode, loff_t size)
1310 {
1311 struct ceph_inode_info *ci = ceph_inode(inode);
1312 int ret = 0;
1313
1314 spin_lock(&ci->i_ceph_lock);
1315 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1316 inode->i_size = size;
1317 inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1318
1319 /* tell the MDS if we are approaching max_size */
1320 if ((size << 1) >= ci->i_max_size &&
1321 (ci->i_reported_size << 1) < ci->i_max_size)
1322 ret = 1;
1323
1324 spin_unlock(&ci->i_ceph_lock);
1325 return ret;
1326 }
1327
1328 /*
1329 * Write back inode data in a worker thread. (This can't be done
1330 * in the message handler context.)
1331 */
1332 void ceph_queue_writeback(struct inode *inode)
1333 {
1334 ihold(inode);
1335 if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1336 &ceph_inode(inode)->i_wb_work)) {
1337 dout("ceph_queue_writeback %p\n", inode);
1338 } else {
1339 dout("ceph_queue_writeback %p failed\n", inode);
1340 iput(inode);
1341 }
1342 }
1343
1344 static void ceph_writeback_work(struct work_struct *work)
1345 {
1346 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1347 i_wb_work);
1348 struct inode *inode = &ci->vfs_inode;
1349
1350 dout("writeback %p\n", inode);
1351 filemap_fdatawrite(&inode->i_data);
1352 iput(inode);
1353 }
1354
1355 /*
1356 * queue an async invalidation
1357 */
1358 void ceph_queue_invalidate(struct inode *inode)
1359 {
1360 ihold(inode);
1361 if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1362 &ceph_inode(inode)->i_pg_inv_work)) {
1363 dout("ceph_queue_invalidate %p\n", inode);
1364 } else {
1365 dout("ceph_queue_invalidate %p failed\n", inode);
1366 iput(inode);
1367 }
1368 }
1369
1370 /*
1371 * Invalidate inode pages in a worker thread. (This can't be done
1372 * in the message handler context.)
1373 */
1374 static void ceph_invalidate_work(struct work_struct *work)
1375 {
1376 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1377 i_pg_inv_work);
1378 struct inode *inode = &ci->vfs_inode;
1379 u32 orig_gen;
1380 int check = 0;
1381
1382 spin_lock(&ci->i_ceph_lock);
1383 dout("invalidate_pages %p gen %d revoking %d\n", inode,
1384 ci->i_rdcache_gen, ci->i_rdcache_revoking);
1385 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1386 /* nevermind! */
1387 spin_unlock(&ci->i_ceph_lock);
1388 goto out;
1389 }
1390 orig_gen = ci->i_rdcache_gen;
1391 spin_unlock(&ci->i_ceph_lock);
1392
1393 truncate_inode_pages(&inode->i_data, 0);
1394
1395 spin_lock(&ci->i_ceph_lock);
1396 if (orig_gen == ci->i_rdcache_gen &&
1397 orig_gen == ci->i_rdcache_revoking) {
1398 dout("invalidate_pages %p gen %d successful\n", inode,
1399 ci->i_rdcache_gen);
1400 ci->i_rdcache_revoking--;
1401 check = 1;
1402 } else {
1403 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1404 inode, orig_gen, ci->i_rdcache_gen,
1405 ci->i_rdcache_revoking);
1406 }
1407 spin_unlock(&ci->i_ceph_lock);
1408
1409 if (check)
1410 ceph_check_caps(ci, 0, NULL);
1411 out:
1412 iput(inode);
1413 }
1414
1415
1416 /*
1417 * called by trunc_wq; take i_mutex ourselves
1418 *
1419 * We also truncate in a separate thread as well.
1420 */
1421 static void ceph_vmtruncate_work(struct work_struct *work)
1422 {
1423 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1424 i_vmtruncate_work);
1425 struct inode *inode = &ci->vfs_inode;
1426
1427 dout("vmtruncate_work %p\n", inode);
1428 mutex_lock(&inode->i_mutex);
1429 __ceph_do_pending_vmtruncate(inode);
1430 mutex_unlock(&inode->i_mutex);
1431 iput(inode);
1432 }
1433
1434 /*
1435 * Queue an async vmtruncate. If we fail to queue work, we will handle
1436 * the truncation the next time we call __ceph_do_pending_vmtruncate.
1437 */
1438 void ceph_queue_vmtruncate(struct inode *inode)
1439 {
1440 struct ceph_inode_info *ci = ceph_inode(inode);
1441
1442 ihold(inode);
1443 if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1444 &ci->i_vmtruncate_work)) {
1445 dout("ceph_queue_vmtruncate %p\n", inode);
1446 } else {
1447 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1448 inode, ci->i_truncate_pending);
1449 iput(inode);
1450 }
1451 }
1452
1453 /*
1454 * called with i_mutex held.
1455 *
1456 * Make sure any pending truncation is applied before doing anything
1457 * that may depend on it.
1458 */
1459 void __ceph_do_pending_vmtruncate(struct inode *inode)
1460 {
1461 struct ceph_inode_info *ci = ceph_inode(inode);
1462 u64 to;
1463 int wrbuffer_refs, wake = 0;
1464
1465 retry:
1466 spin_lock(&ci->i_ceph_lock);
1467 if (ci->i_truncate_pending == 0) {
1468 dout("__do_pending_vmtruncate %p none pending\n", inode);
1469 spin_unlock(&ci->i_ceph_lock);
1470 return;
1471 }
1472
1473 /*
1474 * make sure any dirty snapped pages are flushed before we
1475 * possibly truncate them.. so write AND block!
1476 */
1477 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1478 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1479 inode);
1480 spin_unlock(&ci->i_ceph_lock);
1481 filemap_write_and_wait_range(&inode->i_data, 0,
1482 inode->i_sb->s_maxbytes);
1483 goto retry;
1484 }
1485
1486 to = ci->i_truncate_size;
1487 wrbuffer_refs = ci->i_wrbuffer_ref;
1488 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1489 ci->i_truncate_pending, to);
1490 spin_unlock(&ci->i_ceph_lock);
1491
1492 truncate_inode_pages(inode->i_mapping, to);
1493
1494 spin_lock(&ci->i_ceph_lock);
1495 ci->i_truncate_pending--;
1496 if (ci->i_truncate_pending == 0)
1497 wake = 1;
1498 spin_unlock(&ci->i_ceph_lock);
1499
1500 if (wrbuffer_refs == 0)
1501 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1502 if (wake)
1503 wake_up_all(&ci->i_cap_wq);
1504 }
1505
1506
1507 /*
1508 * symlinks
1509 */
1510 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1511 {
1512 struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1513 nd_set_link(nd, ci->i_symlink);
1514 return NULL;
1515 }
1516
1517 static const struct inode_operations ceph_symlink_iops = {
1518 .readlink = generic_readlink,
1519 .follow_link = ceph_sym_follow_link,
1520 };
1521
1522 /*
1523 * setattr
1524 */
1525 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1526 {
1527 struct inode *inode = dentry->d_inode;
1528 struct ceph_inode_info *ci = ceph_inode(inode);
1529 struct inode *parent_inode;
1530 const unsigned int ia_valid = attr->ia_valid;
1531 struct ceph_mds_request *req;
1532 struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1533 int issued;
1534 int release = 0, dirtied = 0;
1535 int mask = 0;
1536 int err = 0;
1537 int inode_dirty_flags = 0;
1538
1539 if (ceph_snap(inode) != CEPH_NOSNAP)
1540 return -EROFS;
1541
1542 __ceph_do_pending_vmtruncate(inode);
1543
1544 err = inode_change_ok(inode, attr);
1545 if (err != 0)
1546 return err;
1547
1548 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1549 USE_AUTH_MDS);
1550 if (IS_ERR(req))
1551 return PTR_ERR(req);
1552
1553 spin_lock(&ci->i_ceph_lock);
1554 issued = __ceph_caps_issued(ci, NULL);
1555 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1556
1557 if (ia_valid & ATTR_UID) {
1558 dout("setattr %p uid %d -> %d\n", inode,
1559 inode->i_uid, attr->ia_uid);
1560 if (issued & CEPH_CAP_AUTH_EXCL) {
1561 inode->i_uid = attr->ia_uid;
1562 dirtied |= CEPH_CAP_AUTH_EXCL;
1563 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1564 attr->ia_uid != inode->i_uid) {
1565 req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid);
1566 mask |= CEPH_SETATTR_UID;
1567 release |= CEPH_CAP_AUTH_SHARED;
1568 }
1569 }
1570 if (ia_valid & ATTR_GID) {
1571 dout("setattr %p gid %d -> %d\n", inode,
1572 inode->i_gid, attr->ia_gid);
1573 if (issued & CEPH_CAP_AUTH_EXCL) {
1574 inode->i_gid = attr->ia_gid;
1575 dirtied |= CEPH_CAP_AUTH_EXCL;
1576 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1577 attr->ia_gid != inode->i_gid) {
1578 req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid);
1579 mask |= CEPH_SETATTR_GID;
1580 release |= CEPH_CAP_AUTH_SHARED;
1581 }
1582 }
1583 if (ia_valid & ATTR_MODE) {
1584 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1585 attr->ia_mode);
1586 if (issued & CEPH_CAP_AUTH_EXCL) {
1587 inode->i_mode = attr->ia_mode;
1588 dirtied |= CEPH_CAP_AUTH_EXCL;
1589 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1590 attr->ia_mode != inode->i_mode) {
1591 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1592 mask |= CEPH_SETATTR_MODE;
1593 release |= CEPH_CAP_AUTH_SHARED;
1594 }
1595 }
1596
1597 if (ia_valid & ATTR_ATIME) {
1598 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1599 inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1600 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1601 if (issued & CEPH_CAP_FILE_EXCL) {
1602 ci->i_time_warp_seq++;
1603 inode->i_atime = attr->ia_atime;
1604 dirtied |= CEPH_CAP_FILE_EXCL;
1605 } else if ((issued & CEPH_CAP_FILE_WR) &&
1606 timespec_compare(&inode->i_atime,
1607 &attr->ia_atime) < 0) {
1608 inode->i_atime = attr->ia_atime;
1609 dirtied |= CEPH_CAP_FILE_WR;
1610 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1611 !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1612 ceph_encode_timespec(&req->r_args.setattr.atime,
1613 &attr->ia_atime);
1614 mask |= CEPH_SETATTR_ATIME;
1615 release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1616 CEPH_CAP_FILE_WR;
1617 }
1618 }
1619 if (ia_valid & ATTR_MTIME) {
1620 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1621 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1622 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1623 if (issued & CEPH_CAP_FILE_EXCL) {
1624 ci->i_time_warp_seq++;
1625 inode->i_mtime = attr->ia_mtime;
1626 dirtied |= CEPH_CAP_FILE_EXCL;
1627 } else if ((issued & CEPH_CAP_FILE_WR) &&
1628 timespec_compare(&inode->i_mtime,
1629 &attr->ia_mtime) < 0) {
1630 inode->i_mtime = attr->ia_mtime;
1631 dirtied |= CEPH_CAP_FILE_WR;
1632 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1633 !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1634 ceph_encode_timespec(&req->r_args.setattr.mtime,
1635 &attr->ia_mtime);
1636 mask |= CEPH_SETATTR_MTIME;
1637 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1638 CEPH_CAP_FILE_WR;
1639 }
1640 }
1641 if (ia_valid & ATTR_SIZE) {
1642 dout("setattr %p size %lld -> %lld\n", inode,
1643 inode->i_size, attr->ia_size);
1644 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1645 err = -EINVAL;
1646 goto out;
1647 }
1648 if ((issued & CEPH_CAP_FILE_EXCL) &&
1649 attr->ia_size > inode->i_size) {
1650 inode->i_size = attr->ia_size;
1651 inode->i_blocks =
1652 (attr->ia_size + (1 << 9) - 1) >> 9;
1653 inode->i_ctime = attr->ia_ctime;
1654 ci->i_reported_size = attr->ia_size;
1655 dirtied |= CEPH_CAP_FILE_EXCL;
1656 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1657 attr->ia_size != inode->i_size) {
1658 req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1659 req->r_args.setattr.old_size =
1660 cpu_to_le64(inode->i_size);
1661 mask |= CEPH_SETATTR_SIZE;
1662 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1663 CEPH_CAP_FILE_WR;
1664 }
1665 }
1666
1667 /* these do nothing */
1668 if (ia_valid & ATTR_CTIME) {
1669 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1670 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1671 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1672 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1673 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1674 only ? "ctime only" : "ignored");
1675 inode->i_ctime = attr->ia_ctime;
1676 if (only) {
1677 /*
1678 * if kernel wants to dirty ctime but nothing else,
1679 * we need to choose a cap to dirty under, or do
1680 * a almost-no-op setattr
1681 */
1682 if (issued & CEPH_CAP_AUTH_EXCL)
1683 dirtied |= CEPH_CAP_AUTH_EXCL;
1684 else if (issued & CEPH_CAP_FILE_EXCL)
1685 dirtied |= CEPH_CAP_FILE_EXCL;
1686 else if (issued & CEPH_CAP_XATTR_EXCL)
1687 dirtied |= CEPH_CAP_XATTR_EXCL;
1688 else
1689 mask |= CEPH_SETATTR_CTIME;
1690 }
1691 }
1692 if (ia_valid & ATTR_FILE)
1693 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1694
1695 if (dirtied) {
1696 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied);
1697 inode->i_ctime = CURRENT_TIME;
1698 }
1699
1700 release &= issued;
1701 spin_unlock(&ci->i_ceph_lock);
1702
1703 if (inode_dirty_flags)
1704 __mark_inode_dirty(inode, inode_dirty_flags);
1705
1706 if (mask) {
1707 req->r_inode = inode;
1708 ihold(inode);
1709 req->r_inode_drop = release;
1710 req->r_args.setattr.mask = cpu_to_le32(mask);
1711 req->r_num_caps = 1;
1712 parent_inode = ceph_get_dentry_parent_inode(dentry);
1713 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1714 iput(parent_inode);
1715 }
1716 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1717 ceph_cap_string(dirtied), mask);
1718
1719 ceph_mdsc_put_request(req);
1720 __ceph_do_pending_vmtruncate(inode);
1721 return err;
1722 out:
1723 spin_unlock(&ci->i_ceph_lock);
1724 ceph_mdsc_put_request(req);
1725 return err;
1726 }
1727
1728 /*
1729 * Verify that we have a lease on the given mask. If not,
1730 * do a getattr against an mds.
1731 */
1732 int ceph_do_getattr(struct inode *inode, int mask)
1733 {
1734 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
1735 struct ceph_mds_client *mdsc = fsc->mdsc;
1736 struct ceph_mds_request *req;
1737 int err;
1738
1739 if (ceph_snap(inode) == CEPH_SNAPDIR) {
1740 dout("do_getattr inode %p SNAPDIR\n", inode);
1741 return 0;
1742 }
1743
1744 dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode);
1745 if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1746 return 0;
1747
1748 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1749 if (IS_ERR(req))
1750 return PTR_ERR(req);
1751 req->r_inode = inode;
1752 ihold(inode);
1753 req->r_num_caps = 1;
1754 req->r_args.getattr.mask = cpu_to_le32(mask);
1755 err = ceph_mdsc_do_request(mdsc, NULL, req);
1756 ceph_mdsc_put_request(req);
1757 dout("do_getattr result=%d\n", err);
1758 return err;
1759 }
1760
1761
1762 /*
1763 * Check inode permissions. We verify we have a valid value for
1764 * the AUTH cap, then call the generic handler.
1765 */
1766 int ceph_permission(struct inode *inode, int mask)
1767 {
1768 int err;
1769
1770 if (mask & MAY_NOT_BLOCK)
1771 return -ECHILD;
1772
1773 err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1774
1775 if (!err)
1776 err = generic_permission(inode, mask);
1777 return err;
1778 }
1779
1780 /*
1781 * Get all attributes. Hopefully somedata we'll have a statlite()
1782 * and can limit the fields we require to be accurate.
1783 */
1784 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1785 struct kstat *stat)
1786 {
1787 struct inode *inode = dentry->d_inode;
1788 struct ceph_inode_info *ci = ceph_inode(inode);
1789 int err;
1790
1791 err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1792 if (!err) {
1793 generic_fillattr(inode, stat);
1794 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
1795 if (ceph_snap(inode) != CEPH_NOSNAP)
1796 stat->dev = ceph_snap(inode);
1797 else
1798 stat->dev = 0;
1799 if (S_ISDIR(inode->i_mode)) {
1800 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
1801 RBYTES))
1802 stat->size = ci->i_rbytes;
1803 else
1804 stat->size = ci->i_files + ci->i_subdirs;
1805 stat->blocks = 0;
1806 stat->blksize = 65536;
1807 }
1808 }
1809 return err;
1810 }