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ixgbe: fix for unused variable warning with certain config
[deliverable/linux.git] / fs / ceph / inode.c
1 #include <linux/ceph/ceph_debug.h>
2
3 #include <linux/module.h>
4 #include <linux/fs.h>
5 #include <linux/slab.h>
6 #include <linux/string.h>
7 #include <linux/uaccess.h>
8 #include <linux/kernel.h>
9 #include <linux/namei.h>
10 #include <linux/writeback.h>
11 #include <linux/vmalloc.h>
12
13 #include "super.h"
14 #include "mds_client.h"
15 #include "cache.h"
16 #include <linux/ceph/decode.h>
17
18 /*
19 * Ceph inode operations
20 *
21 * Implement basic inode helpers (get, alloc) and inode ops (getattr,
22 * setattr, etc.), xattr helpers, and helpers for assimilating
23 * metadata returned by the MDS into our cache.
24 *
25 * Also define helpers for doing asynchronous writeback, invalidation,
26 * and truncation for the benefit of those who can't afford to block
27 * (typically because they are in the message handler path).
28 */
29
30 static const struct inode_operations ceph_symlink_iops;
31
32 static void ceph_invalidate_work(struct work_struct *work);
33 static void ceph_writeback_work(struct work_struct *work);
34 static void ceph_vmtruncate_work(struct work_struct *work);
35
36 /*
37 * find or create an inode, given the ceph ino number
38 */
39 static int ceph_set_ino_cb(struct inode *inode, void *data)
40 {
41 ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
42 inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
43 return 0;
44 }
45
46 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
47 {
48 struct inode *inode;
49 ino_t t = ceph_vino_to_ino(vino);
50
51 inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
52 if (inode == NULL)
53 return ERR_PTR(-ENOMEM);
54 if (inode->i_state & I_NEW) {
55 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
56 inode, ceph_vinop(inode), (u64)inode->i_ino);
57 unlock_new_inode(inode);
58 }
59
60 dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
61 vino.snap, inode);
62 return inode;
63 }
64
65 /*
66 * get/constuct snapdir inode for a given directory
67 */
68 struct inode *ceph_get_snapdir(struct inode *parent)
69 {
70 struct ceph_vino vino = {
71 .ino = ceph_ino(parent),
72 .snap = CEPH_SNAPDIR,
73 };
74 struct inode *inode = ceph_get_inode(parent->i_sb, vino);
75 struct ceph_inode_info *ci = ceph_inode(inode);
76
77 BUG_ON(!S_ISDIR(parent->i_mode));
78 if (IS_ERR(inode))
79 return inode;
80 inode->i_mode = parent->i_mode;
81 inode->i_uid = parent->i_uid;
82 inode->i_gid = parent->i_gid;
83 inode->i_op = &ceph_dir_iops;
84 inode->i_fop = &ceph_dir_fops;
85 ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
86 ci->i_rbytes = 0;
87 return inode;
88 }
89
90 const struct inode_operations ceph_file_iops = {
91 .permission = ceph_permission,
92 .setattr = ceph_setattr,
93 .getattr = ceph_getattr,
94 .setxattr = ceph_setxattr,
95 .getxattr = ceph_getxattr,
96 .listxattr = ceph_listxattr,
97 .removexattr = ceph_removexattr,
98 };
99
100
101 /*
102 * We use a 'frag tree' to keep track of the MDS's directory fragments
103 * for a given inode (usually there is just a single fragment). We
104 * need to know when a child frag is delegated to a new MDS, or when
105 * it is flagged as replicated, so we can direct our requests
106 * accordingly.
107 */
108
109 /*
110 * find/create a frag in the tree
111 */
112 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
113 u32 f)
114 {
115 struct rb_node **p;
116 struct rb_node *parent = NULL;
117 struct ceph_inode_frag *frag;
118 int c;
119
120 p = &ci->i_fragtree.rb_node;
121 while (*p) {
122 parent = *p;
123 frag = rb_entry(parent, struct ceph_inode_frag, node);
124 c = ceph_frag_compare(f, frag->frag);
125 if (c < 0)
126 p = &(*p)->rb_left;
127 else if (c > 0)
128 p = &(*p)->rb_right;
129 else
130 return frag;
131 }
132
133 frag = kmalloc(sizeof(*frag), GFP_NOFS);
134 if (!frag) {
135 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
136 "frag %x\n", &ci->vfs_inode,
137 ceph_vinop(&ci->vfs_inode), f);
138 return ERR_PTR(-ENOMEM);
139 }
140 frag->frag = f;
141 frag->split_by = 0;
142 frag->mds = -1;
143 frag->ndist = 0;
144
145 rb_link_node(&frag->node, parent, p);
146 rb_insert_color(&frag->node, &ci->i_fragtree);
147
148 dout("get_or_create_frag added %llx.%llx frag %x\n",
149 ceph_vinop(&ci->vfs_inode), f);
150 return frag;
151 }
152
153 /*
154 * find a specific frag @f
155 */
156 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
157 {
158 struct rb_node *n = ci->i_fragtree.rb_node;
159
160 while (n) {
161 struct ceph_inode_frag *frag =
162 rb_entry(n, struct ceph_inode_frag, node);
163 int c = ceph_frag_compare(f, frag->frag);
164 if (c < 0)
165 n = n->rb_left;
166 else if (c > 0)
167 n = n->rb_right;
168 else
169 return frag;
170 }
171 return NULL;
172 }
173
174 /*
175 * Choose frag containing the given value @v. If @pfrag is
176 * specified, copy the frag delegation info to the caller if
177 * it is present.
178 */
179 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
180 struct ceph_inode_frag *pfrag,
181 int *found)
182 {
183 u32 t = ceph_frag_make(0, 0);
184 struct ceph_inode_frag *frag;
185 unsigned nway, i;
186 u32 n;
187
188 if (found)
189 *found = 0;
190
191 mutex_lock(&ci->i_fragtree_mutex);
192 while (1) {
193 WARN_ON(!ceph_frag_contains_value(t, v));
194 frag = __ceph_find_frag(ci, t);
195 if (!frag)
196 break; /* t is a leaf */
197 if (frag->split_by == 0) {
198 if (pfrag)
199 memcpy(pfrag, frag, sizeof(*pfrag));
200 if (found)
201 *found = 1;
202 break;
203 }
204
205 /* choose child */
206 nway = 1 << frag->split_by;
207 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
208 frag->split_by, nway);
209 for (i = 0; i < nway; i++) {
210 n = ceph_frag_make_child(t, frag->split_by, i);
211 if (ceph_frag_contains_value(n, v)) {
212 t = n;
213 break;
214 }
215 }
216 BUG_ON(i == nway);
217 }
218 dout("choose_frag(%x) = %x\n", v, t);
219
220 mutex_unlock(&ci->i_fragtree_mutex);
221 return t;
222 }
223
224 /*
225 * Process dirfrag (delegation) info from the mds. Include leaf
226 * fragment in tree ONLY if ndist > 0. Otherwise, only
227 * branches/splits are included in i_fragtree)
228 */
229 static int ceph_fill_dirfrag(struct inode *inode,
230 struct ceph_mds_reply_dirfrag *dirinfo)
231 {
232 struct ceph_inode_info *ci = ceph_inode(inode);
233 struct ceph_inode_frag *frag;
234 u32 id = le32_to_cpu(dirinfo->frag);
235 int mds = le32_to_cpu(dirinfo->auth);
236 int ndist = le32_to_cpu(dirinfo->ndist);
237 int i;
238 int err = 0;
239
240 mutex_lock(&ci->i_fragtree_mutex);
241 if (ndist == 0) {
242 /* no delegation info needed. */
243 frag = __ceph_find_frag(ci, id);
244 if (!frag)
245 goto out;
246 if (frag->split_by == 0) {
247 /* tree leaf, remove */
248 dout("fill_dirfrag removed %llx.%llx frag %x"
249 " (no ref)\n", ceph_vinop(inode), id);
250 rb_erase(&frag->node, &ci->i_fragtree);
251 kfree(frag);
252 } else {
253 /* tree branch, keep and clear */
254 dout("fill_dirfrag cleared %llx.%llx frag %x"
255 " referral\n", ceph_vinop(inode), id);
256 frag->mds = -1;
257 frag->ndist = 0;
258 }
259 goto out;
260 }
261
262
263 /* find/add this frag to store mds delegation info */
264 frag = __get_or_create_frag(ci, id);
265 if (IS_ERR(frag)) {
266 /* this is not the end of the world; we can continue
267 with bad/inaccurate delegation info */
268 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
269 ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
270 err = -ENOMEM;
271 goto out;
272 }
273
274 frag->mds = mds;
275 frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
276 for (i = 0; i < frag->ndist; i++)
277 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
278 dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
279 ceph_vinop(inode), frag->frag, frag->ndist);
280
281 out:
282 mutex_unlock(&ci->i_fragtree_mutex);
283 return err;
284 }
285
286
287 /*
288 * initialize a newly allocated inode.
289 */
290 struct inode *ceph_alloc_inode(struct super_block *sb)
291 {
292 struct ceph_inode_info *ci;
293 int i;
294
295 ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
296 if (!ci)
297 return NULL;
298
299 dout("alloc_inode %p\n", &ci->vfs_inode);
300
301 spin_lock_init(&ci->i_ceph_lock);
302
303 ci->i_version = 0;
304 ci->i_time_warp_seq = 0;
305 ci->i_ceph_flags = 0;
306 atomic_set(&ci->i_release_count, 1);
307 atomic_set(&ci->i_complete_count, 0);
308 ci->i_symlink = NULL;
309
310 memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
311
312 ci->i_fragtree = RB_ROOT;
313 mutex_init(&ci->i_fragtree_mutex);
314
315 ci->i_xattrs.blob = NULL;
316 ci->i_xattrs.prealloc_blob = NULL;
317 ci->i_xattrs.dirty = false;
318 ci->i_xattrs.index = RB_ROOT;
319 ci->i_xattrs.count = 0;
320 ci->i_xattrs.names_size = 0;
321 ci->i_xattrs.vals_size = 0;
322 ci->i_xattrs.version = 0;
323 ci->i_xattrs.index_version = 0;
324
325 ci->i_caps = RB_ROOT;
326 ci->i_auth_cap = NULL;
327 ci->i_dirty_caps = 0;
328 ci->i_flushing_caps = 0;
329 INIT_LIST_HEAD(&ci->i_dirty_item);
330 INIT_LIST_HEAD(&ci->i_flushing_item);
331 ci->i_cap_flush_seq = 0;
332 ci->i_cap_flush_last_tid = 0;
333 memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
334 init_waitqueue_head(&ci->i_cap_wq);
335 ci->i_hold_caps_min = 0;
336 ci->i_hold_caps_max = 0;
337 INIT_LIST_HEAD(&ci->i_cap_delay_list);
338 ci->i_cap_exporting_mds = 0;
339 ci->i_cap_exporting_mseq = 0;
340 ci->i_cap_exporting_issued = 0;
341 INIT_LIST_HEAD(&ci->i_cap_snaps);
342 ci->i_head_snapc = NULL;
343 ci->i_snap_caps = 0;
344
345 for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
346 ci->i_nr_by_mode[i] = 0;
347
348 mutex_init(&ci->i_truncate_mutex);
349 ci->i_truncate_seq = 0;
350 ci->i_truncate_size = 0;
351 ci->i_truncate_pending = 0;
352
353 ci->i_max_size = 0;
354 ci->i_reported_size = 0;
355 ci->i_wanted_max_size = 0;
356 ci->i_requested_max_size = 0;
357
358 ci->i_pin_ref = 0;
359 ci->i_rd_ref = 0;
360 ci->i_rdcache_ref = 0;
361 ci->i_wr_ref = 0;
362 ci->i_wb_ref = 0;
363 ci->i_wrbuffer_ref = 0;
364 ci->i_wrbuffer_ref_head = 0;
365 ci->i_shared_gen = 0;
366 ci->i_rdcache_gen = 0;
367 ci->i_rdcache_revoking = 0;
368
369 INIT_LIST_HEAD(&ci->i_unsafe_writes);
370 INIT_LIST_HEAD(&ci->i_unsafe_dirops);
371 spin_lock_init(&ci->i_unsafe_lock);
372
373 ci->i_snap_realm = NULL;
374 INIT_LIST_HEAD(&ci->i_snap_realm_item);
375 INIT_LIST_HEAD(&ci->i_snap_flush_item);
376
377 INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
378 INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
379
380 INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
381
382 ceph_fscache_inode_init(ci);
383
384 return &ci->vfs_inode;
385 }
386
387 static void ceph_i_callback(struct rcu_head *head)
388 {
389 struct inode *inode = container_of(head, struct inode, i_rcu);
390 struct ceph_inode_info *ci = ceph_inode(inode);
391
392 kmem_cache_free(ceph_inode_cachep, ci);
393 }
394
395 void ceph_destroy_inode(struct inode *inode)
396 {
397 struct ceph_inode_info *ci = ceph_inode(inode);
398 struct ceph_inode_frag *frag;
399 struct rb_node *n;
400
401 dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
402
403 ceph_fscache_unregister_inode_cookie(ci);
404
405 ceph_queue_caps_release(inode);
406
407 /*
408 * we may still have a snap_realm reference if there are stray
409 * caps in i_cap_exporting_issued or i_snap_caps.
410 */
411 if (ci->i_snap_realm) {
412 struct ceph_mds_client *mdsc =
413 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
414 struct ceph_snap_realm *realm = ci->i_snap_realm;
415
416 dout(" dropping residual ref to snap realm %p\n", realm);
417 spin_lock(&realm->inodes_with_caps_lock);
418 list_del_init(&ci->i_snap_realm_item);
419 spin_unlock(&realm->inodes_with_caps_lock);
420 ceph_put_snap_realm(mdsc, realm);
421 }
422
423 kfree(ci->i_symlink);
424 while ((n = rb_first(&ci->i_fragtree)) != NULL) {
425 frag = rb_entry(n, struct ceph_inode_frag, node);
426 rb_erase(n, &ci->i_fragtree);
427 kfree(frag);
428 }
429
430 __ceph_destroy_xattrs(ci);
431 if (ci->i_xattrs.blob)
432 ceph_buffer_put(ci->i_xattrs.blob);
433 if (ci->i_xattrs.prealloc_blob)
434 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
435
436 call_rcu(&inode->i_rcu, ceph_i_callback);
437 }
438
439 /*
440 * Helpers to fill in size, ctime, mtime, and atime. We have to be
441 * careful because either the client or MDS may have more up to date
442 * info, depending on which capabilities are held, and whether
443 * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime
444 * and size are monotonically increasing, except when utimes() or
445 * truncate() increments the corresponding _seq values.)
446 */
447 int ceph_fill_file_size(struct inode *inode, int issued,
448 u32 truncate_seq, u64 truncate_size, u64 size)
449 {
450 struct ceph_inode_info *ci = ceph_inode(inode);
451 int queue_trunc = 0;
452
453 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
454 (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
455 dout("size %lld -> %llu\n", inode->i_size, size);
456 inode->i_size = size;
457 inode->i_blocks = (size + (1<<9) - 1) >> 9;
458 ci->i_reported_size = size;
459 if (truncate_seq != ci->i_truncate_seq) {
460 dout("truncate_seq %u -> %u\n",
461 ci->i_truncate_seq, truncate_seq);
462 ci->i_truncate_seq = truncate_seq;
463
464 /* the MDS should have revoked these caps */
465 WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
466 CEPH_CAP_FILE_RD |
467 CEPH_CAP_FILE_WR |
468 CEPH_CAP_FILE_LAZYIO));
469 /*
470 * If we hold relevant caps, or in the case where we're
471 * not the only client referencing this file and we
472 * don't hold those caps, then we need to check whether
473 * the file is either opened or mmaped
474 */
475 if ((issued & (CEPH_CAP_FILE_CACHE|
476 CEPH_CAP_FILE_BUFFER)) ||
477 mapping_mapped(inode->i_mapping) ||
478 __ceph_caps_file_wanted(ci)) {
479 ci->i_truncate_pending++;
480 queue_trunc = 1;
481 }
482 }
483 }
484 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
485 ci->i_truncate_size != truncate_size) {
486 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
487 truncate_size);
488 ci->i_truncate_size = truncate_size;
489 }
490
491 if (queue_trunc)
492 ceph_fscache_invalidate(inode);
493
494 return queue_trunc;
495 }
496
497 void ceph_fill_file_time(struct inode *inode, int issued,
498 u64 time_warp_seq, struct timespec *ctime,
499 struct timespec *mtime, struct timespec *atime)
500 {
501 struct ceph_inode_info *ci = ceph_inode(inode);
502 int warn = 0;
503
504 if (issued & (CEPH_CAP_FILE_EXCL|
505 CEPH_CAP_FILE_WR|
506 CEPH_CAP_FILE_BUFFER|
507 CEPH_CAP_AUTH_EXCL|
508 CEPH_CAP_XATTR_EXCL)) {
509 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
510 dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
511 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
512 ctime->tv_sec, ctime->tv_nsec);
513 inode->i_ctime = *ctime;
514 }
515 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
516 /* the MDS did a utimes() */
517 dout("mtime %ld.%09ld -> %ld.%09ld "
518 "tw %d -> %d\n",
519 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
520 mtime->tv_sec, mtime->tv_nsec,
521 ci->i_time_warp_seq, (int)time_warp_seq);
522
523 inode->i_mtime = *mtime;
524 inode->i_atime = *atime;
525 ci->i_time_warp_seq = time_warp_seq;
526 } else if (time_warp_seq == ci->i_time_warp_seq) {
527 /* nobody did utimes(); take the max */
528 if (timespec_compare(mtime, &inode->i_mtime) > 0) {
529 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
530 inode->i_mtime.tv_sec,
531 inode->i_mtime.tv_nsec,
532 mtime->tv_sec, mtime->tv_nsec);
533 inode->i_mtime = *mtime;
534 }
535 if (timespec_compare(atime, &inode->i_atime) > 0) {
536 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
537 inode->i_atime.tv_sec,
538 inode->i_atime.tv_nsec,
539 atime->tv_sec, atime->tv_nsec);
540 inode->i_atime = *atime;
541 }
542 } else if (issued & CEPH_CAP_FILE_EXCL) {
543 /* we did a utimes(); ignore mds values */
544 } else {
545 warn = 1;
546 }
547 } else {
548 /* we have no write|excl caps; whatever the MDS says is true */
549 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
550 inode->i_ctime = *ctime;
551 inode->i_mtime = *mtime;
552 inode->i_atime = *atime;
553 ci->i_time_warp_seq = time_warp_seq;
554 } else {
555 warn = 1;
556 }
557 }
558 if (warn) /* time_warp_seq shouldn't go backwards */
559 dout("%p mds time_warp_seq %llu < %u\n",
560 inode, time_warp_seq, ci->i_time_warp_seq);
561 }
562
563 /*
564 * Populate an inode based on info from mds. May be called on new or
565 * existing inodes.
566 */
567 static int fill_inode(struct inode *inode,
568 struct ceph_mds_reply_info_in *iinfo,
569 struct ceph_mds_reply_dirfrag *dirinfo,
570 struct ceph_mds_session *session,
571 unsigned long ttl_from, int cap_fmode,
572 struct ceph_cap_reservation *caps_reservation)
573 {
574 struct ceph_mds_reply_inode *info = iinfo->in;
575 struct ceph_inode_info *ci = ceph_inode(inode);
576 int i;
577 int issued = 0, implemented;
578 struct timespec mtime, atime, ctime;
579 u32 nsplits;
580 struct ceph_inode_frag *frag;
581 struct rb_node *rb_node;
582 struct ceph_buffer *xattr_blob = NULL;
583 int err = 0;
584 int queue_trunc = 0;
585
586 dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
587 inode, ceph_vinop(inode), le64_to_cpu(info->version),
588 ci->i_version);
589
590 /*
591 * prealloc xattr data, if it looks like we'll need it. only
592 * if len > 4 (meaning there are actually xattrs; the first 4
593 * bytes are the xattr count).
594 */
595 if (iinfo->xattr_len > 4) {
596 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
597 if (!xattr_blob)
598 pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
599 iinfo->xattr_len);
600 }
601
602 spin_lock(&ci->i_ceph_lock);
603
604 /*
605 * provided version will be odd if inode value is projected,
606 * even if stable. skip the update if we have newer stable
607 * info (ours>=theirs, e.g. due to racing mds replies), unless
608 * we are getting projected (unstable) info (in which case the
609 * version is odd, and we want ours>theirs).
610 * us them
611 * 2 2 skip
612 * 3 2 skip
613 * 3 3 update
614 */
615 if (le64_to_cpu(info->version) > 0 &&
616 (ci->i_version & ~1) >= le64_to_cpu(info->version))
617 goto no_change;
618
619 issued = __ceph_caps_issued(ci, &implemented);
620 issued |= implemented | __ceph_caps_dirty(ci);
621
622 /* update inode */
623 ci->i_version = le64_to_cpu(info->version);
624 inode->i_version++;
625 inode->i_rdev = le32_to_cpu(info->rdev);
626
627 if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
628 inode->i_mode = le32_to_cpu(info->mode);
629 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
630 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
631 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
632 from_kuid(&init_user_ns, inode->i_uid),
633 from_kgid(&init_user_ns, inode->i_gid));
634 }
635
636 if ((issued & CEPH_CAP_LINK_EXCL) == 0)
637 set_nlink(inode, le32_to_cpu(info->nlink));
638
639 /* be careful with mtime, atime, size */
640 ceph_decode_timespec(&atime, &info->atime);
641 ceph_decode_timespec(&mtime, &info->mtime);
642 ceph_decode_timespec(&ctime, &info->ctime);
643 queue_trunc = ceph_fill_file_size(inode, issued,
644 le32_to_cpu(info->truncate_seq),
645 le64_to_cpu(info->truncate_size),
646 le64_to_cpu(info->size));
647 ceph_fill_file_time(inode, issued,
648 le32_to_cpu(info->time_warp_seq),
649 &ctime, &mtime, &atime);
650
651 /* only update max_size on auth cap */
652 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
653 ci->i_max_size != le64_to_cpu(info->max_size)) {
654 dout("max_size %lld -> %llu\n", ci->i_max_size,
655 le64_to_cpu(info->max_size));
656 ci->i_max_size = le64_to_cpu(info->max_size);
657 }
658
659 ci->i_layout = info->layout;
660 inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
661
662 /* xattrs */
663 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
664 if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
665 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
666 if (ci->i_xattrs.blob)
667 ceph_buffer_put(ci->i_xattrs.blob);
668 ci->i_xattrs.blob = xattr_blob;
669 if (xattr_blob)
670 memcpy(ci->i_xattrs.blob->vec.iov_base,
671 iinfo->xattr_data, iinfo->xattr_len);
672 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
673 xattr_blob = NULL;
674 }
675
676 inode->i_mapping->a_ops = &ceph_aops;
677 inode->i_mapping->backing_dev_info =
678 &ceph_sb_to_client(inode->i_sb)->backing_dev_info;
679
680 switch (inode->i_mode & S_IFMT) {
681 case S_IFIFO:
682 case S_IFBLK:
683 case S_IFCHR:
684 case S_IFSOCK:
685 init_special_inode(inode, inode->i_mode, inode->i_rdev);
686 inode->i_op = &ceph_file_iops;
687 break;
688 case S_IFREG:
689 inode->i_op = &ceph_file_iops;
690 inode->i_fop = &ceph_file_fops;
691 break;
692 case S_IFLNK:
693 inode->i_op = &ceph_symlink_iops;
694 if (!ci->i_symlink) {
695 u32 symlen = iinfo->symlink_len;
696 char *sym;
697
698 spin_unlock(&ci->i_ceph_lock);
699
700 err = -EINVAL;
701 if (WARN_ON(symlen != inode->i_size))
702 goto out;
703
704 err = -ENOMEM;
705 sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
706 if (!sym)
707 goto out;
708
709 spin_lock(&ci->i_ceph_lock);
710 if (!ci->i_symlink)
711 ci->i_symlink = sym;
712 else
713 kfree(sym); /* lost a race */
714 }
715 break;
716 case S_IFDIR:
717 inode->i_op = &ceph_dir_iops;
718 inode->i_fop = &ceph_dir_fops;
719
720 ci->i_dir_layout = iinfo->dir_layout;
721
722 ci->i_files = le64_to_cpu(info->files);
723 ci->i_subdirs = le64_to_cpu(info->subdirs);
724 ci->i_rbytes = le64_to_cpu(info->rbytes);
725 ci->i_rfiles = le64_to_cpu(info->rfiles);
726 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
727 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
728 break;
729 default:
730 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
731 ceph_vinop(inode), inode->i_mode);
732 }
733
734 /* set dir completion flag? */
735 if (S_ISDIR(inode->i_mode) &&
736 ci->i_files == 0 && ci->i_subdirs == 0 &&
737 ceph_snap(inode) == CEPH_NOSNAP &&
738 (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
739 (issued & CEPH_CAP_FILE_EXCL) == 0 &&
740 !__ceph_dir_is_complete(ci)) {
741 dout(" marking %p complete (empty)\n", inode);
742 __ceph_dir_set_complete(ci, atomic_read(&ci->i_release_count));
743 ci->i_max_offset = 2;
744 }
745 no_change:
746 spin_unlock(&ci->i_ceph_lock);
747
748 /* queue truncate if we saw i_size decrease */
749 if (queue_trunc)
750 ceph_queue_vmtruncate(inode);
751
752 /* populate frag tree */
753 /* FIXME: move me up, if/when version reflects fragtree changes */
754 nsplits = le32_to_cpu(info->fragtree.nsplits);
755 mutex_lock(&ci->i_fragtree_mutex);
756 rb_node = rb_first(&ci->i_fragtree);
757 for (i = 0; i < nsplits; i++) {
758 u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
759 frag = NULL;
760 while (rb_node) {
761 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
762 if (ceph_frag_compare(frag->frag, id) >= 0) {
763 if (frag->frag != id)
764 frag = NULL;
765 else
766 rb_node = rb_next(rb_node);
767 break;
768 }
769 rb_node = rb_next(rb_node);
770 rb_erase(&frag->node, &ci->i_fragtree);
771 kfree(frag);
772 frag = NULL;
773 }
774 if (!frag) {
775 frag = __get_or_create_frag(ci, id);
776 if (IS_ERR(frag))
777 continue;
778 }
779 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
780 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
781 }
782 while (rb_node) {
783 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
784 rb_node = rb_next(rb_node);
785 rb_erase(&frag->node, &ci->i_fragtree);
786 kfree(frag);
787 }
788 mutex_unlock(&ci->i_fragtree_mutex);
789
790 /* were we issued a capability? */
791 if (info->cap.caps) {
792 if (ceph_snap(inode) == CEPH_NOSNAP) {
793 ceph_add_cap(inode, session,
794 le64_to_cpu(info->cap.cap_id),
795 cap_fmode,
796 le32_to_cpu(info->cap.caps),
797 le32_to_cpu(info->cap.wanted),
798 le32_to_cpu(info->cap.seq),
799 le32_to_cpu(info->cap.mseq),
800 le64_to_cpu(info->cap.realm),
801 info->cap.flags,
802 caps_reservation);
803 } else {
804 spin_lock(&ci->i_ceph_lock);
805 dout(" %p got snap_caps %s\n", inode,
806 ceph_cap_string(le32_to_cpu(info->cap.caps)));
807 ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
808 if (cap_fmode >= 0)
809 __ceph_get_fmode(ci, cap_fmode);
810 spin_unlock(&ci->i_ceph_lock);
811 }
812 } else if (cap_fmode >= 0) {
813 pr_warning("mds issued no caps on %llx.%llx\n",
814 ceph_vinop(inode));
815 __ceph_get_fmode(ci, cap_fmode);
816 }
817
818 /* update delegation info? */
819 if (dirinfo)
820 ceph_fill_dirfrag(inode, dirinfo);
821
822 err = 0;
823
824 out:
825 if (xattr_blob)
826 ceph_buffer_put(xattr_blob);
827 return err;
828 }
829
830 /*
831 * caller should hold session s_mutex.
832 */
833 static void update_dentry_lease(struct dentry *dentry,
834 struct ceph_mds_reply_lease *lease,
835 struct ceph_mds_session *session,
836 unsigned long from_time)
837 {
838 struct ceph_dentry_info *di = ceph_dentry(dentry);
839 long unsigned duration = le32_to_cpu(lease->duration_ms);
840 long unsigned ttl = from_time + (duration * HZ) / 1000;
841 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
842 struct inode *dir;
843
844 /* only track leases on regular dentries */
845 if (dentry->d_op != &ceph_dentry_ops)
846 return;
847
848 spin_lock(&dentry->d_lock);
849 dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
850 dentry, duration, ttl);
851
852 /* make lease_rdcache_gen match directory */
853 dir = dentry->d_parent->d_inode;
854 di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
855
856 if (duration == 0)
857 goto out_unlock;
858
859 if (di->lease_gen == session->s_cap_gen &&
860 time_before(ttl, dentry->d_time))
861 goto out_unlock; /* we already have a newer lease. */
862
863 if (di->lease_session && di->lease_session != session)
864 goto out_unlock;
865
866 ceph_dentry_lru_touch(dentry);
867
868 if (!di->lease_session)
869 di->lease_session = ceph_get_mds_session(session);
870 di->lease_gen = session->s_cap_gen;
871 di->lease_seq = le32_to_cpu(lease->seq);
872 di->lease_renew_after = half_ttl;
873 di->lease_renew_from = 0;
874 dentry->d_time = ttl;
875 out_unlock:
876 spin_unlock(&dentry->d_lock);
877 return;
878 }
879
880 /*
881 * Set dentry's directory position based on the current dir's max, and
882 * order it in d_subdirs, so that dcache_readdir behaves.
883 *
884 * Always called under directory's i_mutex.
885 */
886 static void ceph_set_dentry_offset(struct dentry *dn)
887 {
888 struct dentry *dir = dn->d_parent;
889 struct inode *inode = dir->d_inode;
890 struct ceph_inode_info *ci;
891 struct ceph_dentry_info *di;
892
893 BUG_ON(!inode);
894
895 ci = ceph_inode(inode);
896 di = ceph_dentry(dn);
897
898 spin_lock(&ci->i_ceph_lock);
899 if (!__ceph_dir_is_complete(ci)) {
900 spin_unlock(&ci->i_ceph_lock);
901 return;
902 }
903 di->offset = ceph_inode(inode)->i_max_offset++;
904 spin_unlock(&ci->i_ceph_lock);
905
906 spin_lock(&dir->d_lock);
907 spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
908 list_move(&dn->d_u.d_child, &dir->d_subdirs);
909 dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
910 dn->d_u.d_child.prev, dn->d_u.d_child.next);
911 spin_unlock(&dn->d_lock);
912 spin_unlock(&dir->d_lock);
913 }
914
915 /*
916 * splice a dentry to an inode.
917 * caller must hold directory i_mutex for this to be safe.
918 *
919 * we will only rehash the resulting dentry if @prehash is
920 * true; @prehash will be set to false (for the benefit of
921 * the caller) if we fail.
922 */
923 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
924 bool *prehash, bool set_offset)
925 {
926 struct dentry *realdn;
927
928 BUG_ON(dn->d_inode);
929
930 /* dn must be unhashed */
931 if (!d_unhashed(dn))
932 d_drop(dn);
933 realdn = d_materialise_unique(dn, in);
934 if (IS_ERR(realdn)) {
935 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
936 PTR_ERR(realdn), dn, in, ceph_vinop(in));
937 if (prehash)
938 *prehash = false; /* don't rehash on error */
939 dn = realdn; /* note realdn contains the error */
940 goto out;
941 } else if (realdn) {
942 dout("dn %p (%d) spliced with %p (%d) "
943 "inode %p ino %llx.%llx\n",
944 dn, d_count(dn),
945 realdn, d_count(realdn),
946 realdn->d_inode, ceph_vinop(realdn->d_inode));
947 dput(dn);
948 dn = realdn;
949 } else {
950 BUG_ON(!ceph_dentry(dn));
951 dout("dn %p attached to %p ino %llx.%llx\n",
952 dn, dn->d_inode, ceph_vinop(dn->d_inode));
953 }
954 if ((!prehash || *prehash) && d_unhashed(dn))
955 d_rehash(dn);
956 if (set_offset)
957 ceph_set_dentry_offset(dn);
958 out:
959 return dn;
960 }
961
962 /*
963 * Incorporate results into the local cache. This is either just
964 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
965 * after a lookup).
966 *
967 * A reply may contain
968 * a directory inode along with a dentry.
969 * and/or a target inode
970 *
971 * Called with snap_rwsem (read).
972 */
973 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
974 struct ceph_mds_session *session)
975 {
976 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
977 struct inode *in = NULL;
978 struct ceph_mds_reply_inode *ininfo;
979 struct ceph_vino vino;
980 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
981 int i = 0;
982 int err = 0;
983
984 dout("fill_trace %p is_dentry %d is_target %d\n", req,
985 rinfo->head->is_dentry, rinfo->head->is_target);
986
987 #if 0
988 /*
989 * Debugging hook:
990 *
991 * If we resend completed ops to a recovering mds, we get no
992 * trace. Since that is very rare, pretend this is the case
993 * to ensure the 'no trace' handlers in the callers behave.
994 *
995 * Fill in inodes unconditionally to avoid breaking cap
996 * invariants.
997 */
998 if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
999 pr_info("fill_trace faking empty trace on %lld %s\n",
1000 req->r_tid, ceph_mds_op_name(rinfo->head->op));
1001 if (rinfo->head->is_dentry) {
1002 rinfo->head->is_dentry = 0;
1003 err = fill_inode(req->r_locked_dir,
1004 &rinfo->diri, rinfo->dirfrag,
1005 session, req->r_request_started, -1);
1006 }
1007 if (rinfo->head->is_target) {
1008 rinfo->head->is_target = 0;
1009 ininfo = rinfo->targeti.in;
1010 vino.ino = le64_to_cpu(ininfo->ino);
1011 vino.snap = le64_to_cpu(ininfo->snapid);
1012 in = ceph_get_inode(sb, vino);
1013 err = fill_inode(in, &rinfo->targeti, NULL,
1014 session, req->r_request_started,
1015 req->r_fmode);
1016 iput(in);
1017 }
1018 }
1019 #endif
1020
1021 if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1022 dout("fill_trace reply is empty!\n");
1023 if (rinfo->head->result == 0 && req->r_locked_dir)
1024 ceph_invalidate_dir_request(req);
1025 return 0;
1026 }
1027
1028 if (rinfo->head->is_dentry) {
1029 struct inode *dir = req->r_locked_dir;
1030
1031 if (dir) {
1032 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
1033 session, req->r_request_started, -1,
1034 &req->r_caps_reservation);
1035 if (err < 0)
1036 return err;
1037 } else {
1038 WARN_ON_ONCE(1);
1039 }
1040 }
1041
1042 /*
1043 * ignore null lease/binding on snapdir ENOENT, or else we
1044 * will have trouble splicing in the virtual snapdir later
1045 */
1046 if (rinfo->head->is_dentry && !req->r_aborted &&
1047 req->r_locked_dir &&
1048 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1049 fsc->mount_options->snapdir_name,
1050 req->r_dentry->d_name.len))) {
1051 /*
1052 * lookup link rename : null -> possibly existing inode
1053 * mknod symlink mkdir : null -> new inode
1054 * unlink : linked -> null
1055 */
1056 struct inode *dir = req->r_locked_dir;
1057 struct dentry *dn = req->r_dentry;
1058 bool have_dir_cap, have_lease;
1059
1060 BUG_ON(!dn);
1061 BUG_ON(!dir);
1062 BUG_ON(dn->d_parent->d_inode != dir);
1063 BUG_ON(ceph_ino(dir) !=
1064 le64_to_cpu(rinfo->diri.in->ino));
1065 BUG_ON(ceph_snap(dir) !=
1066 le64_to_cpu(rinfo->diri.in->snapid));
1067
1068 /* do we have a lease on the whole dir? */
1069 have_dir_cap =
1070 (le32_to_cpu(rinfo->diri.in->cap.caps) &
1071 CEPH_CAP_FILE_SHARED);
1072
1073 /* do we have a dn lease? */
1074 have_lease = have_dir_cap ||
1075 le32_to_cpu(rinfo->dlease->duration_ms);
1076 if (!have_lease)
1077 dout("fill_trace no dentry lease or dir cap\n");
1078
1079 /* rename? */
1080 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1081 dout(" src %p '%.*s' dst %p '%.*s'\n",
1082 req->r_old_dentry,
1083 req->r_old_dentry->d_name.len,
1084 req->r_old_dentry->d_name.name,
1085 dn, dn->d_name.len, dn->d_name.name);
1086 dout("fill_trace doing d_move %p -> %p\n",
1087 req->r_old_dentry, dn);
1088
1089 d_move(req->r_old_dentry, dn);
1090 dout(" src %p '%.*s' dst %p '%.*s'\n",
1091 req->r_old_dentry,
1092 req->r_old_dentry->d_name.len,
1093 req->r_old_dentry->d_name.name,
1094 dn, dn->d_name.len, dn->d_name.name);
1095
1096 /* ensure target dentry is invalidated, despite
1097 rehashing bug in vfs_rename_dir */
1098 ceph_invalidate_dentry_lease(dn);
1099
1100 /*
1101 * d_move() puts the renamed dentry at the end of
1102 * d_subdirs. We need to assign it an appropriate
1103 * directory offset so we can behave when dir is
1104 * complete.
1105 */
1106 ceph_set_dentry_offset(req->r_old_dentry);
1107 dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1108 ceph_dentry(req->r_old_dentry)->offset);
1109
1110 dn = req->r_old_dentry; /* use old_dentry */
1111 in = dn->d_inode;
1112 }
1113
1114 /* null dentry? */
1115 if (!rinfo->head->is_target) {
1116 dout("fill_trace null dentry\n");
1117 if (dn->d_inode) {
1118 dout("d_delete %p\n", dn);
1119 d_delete(dn);
1120 } else {
1121 dout("d_instantiate %p NULL\n", dn);
1122 d_instantiate(dn, NULL);
1123 if (have_lease && d_unhashed(dn))
1124 d_rehash(dn);
1125 update_dentry_lease(dn, rinfo->dlease,
1126 session,
1127 req->r_request_started);
1128 }
1129 goto done;
1130 }
1131
1132 /* attach proper inode */
1133 ininfo = rinfo->targeti.in;
1134 vino.ino = le64_to_cpu(ininfo->ino);
1135 vino.snap = le64_to_cpu(ininfo->snapid);
1136 in = dn->d_inode;
1137 if (!in) {
1138 in = ceph_get_inode(sb, vino);
1139 if (IS_ERR(in)) {
1140 pr_err("fill_trace bad get_inode "
1141 "%llx.%llx\n", vino.ino, vino.snap);
1142 err = PTR_ERR(in);
1143 d_drop(dn);
1144 goto done;
1145 }
1146 dn = splice_dentry(dn, in, &have_lease, true);
1147 if (IS_ERR(dn)) {
1148 err = PTR_ERR(dn);
1149 goto done;
1150 }
1151 req->r_dentry = dn; /* may have spliced */
1152 ihold(in);
1153 } else if (ceph_ino(in) == vino.ino &&
1154 ceph_snap(in) == vino.snap) {
1155 ihold(in);
1156 } else {
1157 dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1158 dn, in, ceph_ino(in), ceph_snap(in),
1159 vino.ino, vino.snap);
1160 have_lease = false;
1161 in = NULL;
1162 }
1163
1164 if (have_lease)
1165 update_dentry_lease(dn, rinfo->dlease, session,
1166 req->r_request_started);
1167 dout(" final dn %p\n", dn);
1168 i++;
1169 } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1170 req->r_op == CEPH_MDS_OP_MKSNAP) && !req->r_aborted) {
1171 struct dentry *dn = req->r_dentry;
1172
1173 /* fill out a snapdir LOOKUPSNAP dentry */
1174 BUG_ON(!dn);
1175 BUG_ON(!req->r_locked_dir);
1176 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1177 ininfo = rinfo->targeti.in;
1178 vino.ino = le64_to_cpu(ininfo->ino);
1179 vino.snap = le64_to_cpu(ininfo->snapid);
1180 in = ceph_get_inode(sb, vino);
1181 if (IS_ERR(in)) {
1182 pr_err("fill_inode get_inode badness %llx.%llx\n",
1183 vino.ino, vino.snap);
1184 err = PTR_ERR(in);
1185 d_delete(dn);
1186 goto done;
1187 }
1188 dout(" linking snapped dir %p to dn %p\n", in, dn);
1189 dn = splice_dentry(dn, in, NULL, true);
1190 if (IS_ERR(dn)) {
1191 err = PTR_ERR(dn);
1192 goto done;
1193 }
1194 req->r_dentry = dn; /* may have spliced */
1195 ihold(in);
1196 rinfo->head->is_dentry = 1; /* fool notrace handlers */
1197 }
1198
1199 if (rinfo->head->is_target) {
1200 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1201 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1202
1203 if (in == NULL || ceph_ino(in) != vino.ino ||
1204 ceph_snap(in) != vino.snap) {
1205 in = ceph_get_inode(sb, vino);
1206 if (IS_ERR(in)) {
1207 err = PTR_ERR(in);
1208 goto done;
1209 }
1210 }
1211 req->r_target_inode = in;
1212
1213 err = fill_inode(in,
1214 &rinfo->targeti, NULL,
1215 session, req->r_request_started,
1216 (le32_to_cpu(rinfo->head->result) == 0) ?
1217 req->r_fmode : -1,
1218 &req->r_caps_reservation);
1219 if (err < 0) {
1220 pr_err("fill_inode badness %p %llx.%llx\n",
1221 in, ceph_vinop(in));
1222 goto done;
1223 }
1224 }
1225
1226 done:
1227 dout("fill_trace done err=%d\n", err);
1228 return err;
1229 }
1230
1231 /*
1232 * Prepopulate our cache with readdir results, leases, etc.
1233 */
1234 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1235 struct ceph_mds_session *session)
1236 {
1237 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1238 int i, err = 0;
1239
1240 for (i = 0; i < rinfo->dir_nr; i++) {
1241 struct ceph_vino vino;
1242 struct inode *in;
1243 int rc;
1244
1245 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1246 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1247
1248 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1249 if (IS_ERR(in)) {
1250 err = PTR_ERR(in);
1251 dout("new_inode badness got %d\n", err);
1252 continue;
1253 }
1254 rc = fill_inode(in, &rinfo->dir_in[i], NULL, session,
1255 req->r_request_started, -1,
1256 &req->r_caps_reservation);
1257 if (rc < 0) {
1258 pr_err("fill_inode badness on %p got %d\n", in, rc);
1259 err = rc;
1260 continue;
1261 }
1262 }
1263
1264 return err;
1265 }
1266
1267 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1268 struct ceph_mds_session *session)
1269 {
1270 struct dentry *parent = req->r_dentry;
1271 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1272 struct qstr dname;
1273 struct dentry *dn;
1274 struct inode *in;
1275 int err = 0, i;
1276 struct inode *snapdir = NULL;
1277 struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1278 struct ceph_dentry_info *di;
1279 u64 r_readdir_offset = req->r_readdir_offset;
1280 u32 frag = le32_to_cpu(rhead->args.readdir.frag);
1281
1282 if (rinfo->dir_dir &&
1283 le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1284 dout("readdir_prepopulate got new frag %x -> %x\n",
1285 frag, le32_to_cpu(rinfo->dir_dir->frag));
1286 frag = le32_to_cpu(rinfo->dir_dir->frag);
1287 if (ceph_frag_is_leftmost(frag))
1288 r_readdir_offset = 2;
1289 else
1290 r_readdir_offset = 0;
1291 }
1292
1293 if (req->r_aborted)
1294 return readdir_prepopulate_inodes_only(req, session);
1295
1296 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1297 snapdir = ceph_get_snapdir(parent->d_inode);
1298 parent = d_find_alias(snapdir);
1299 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1300 rinfo->dir_nr, parent);
1301 } else {
1302 dout("readdir_prepopulate %d items under dn %p\n",
1303 rinfo->dir_nr, parent);
1304 if (rinfo->dir_dir)
1305 ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1306 }
1307
1308 for (i = 0; i < rinfo->dir_nr; i++) {
1309 struct ceph_vino vino;
1310
1311 dname.name = rinfo->dir_dname[i];
1312 dname.len = rinfo->dir_dname_len[i];
1313 dname.hash = full_name_hash(dname.name, dname.len);
1314
1315 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1316 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1317
1318 retry_lookup:
1319 dn = d_lookup(parent, &dname);
1320 dout("d_lookup on parent=%p name=%.*s got %p\n",
1321 parent, dname.len, dname.name, dn);
1322
1323 if (!dn) {
1324 dn = d_alloc(parent, &dname);
1325 dout("d_alloc %p '%.*s' = %p\n", parent,
1326 dname.len, dname.name, dn);
1327 if (dn == NULL) {
1328 dout("d_alloc badness\n");
1329 err = -ENOMEM;
1330 goto out;
1331 }
1332 err = ceph_init_dentry(dn);
1333 if (err < 0) {
1334 dput(dn);
1335 goto out;
1336 }
1337 } else if (dn->d_inode &&
1338 (ceph_ino(dn->d_inode) != vino.ino ||
1339 ceph_snap(dn->d_inode) != vino.snap)) {
1340 dout(" dn %p points to wrong inode %p\n",
1341 dn, dn->d_inode);
1342 d_delete(dn);
1343 dput(dn);
1344 goto retry_lookup;
1345 } else {
1346 /* reorder parent's d_subdirs */
1347 spin_lock(&parent->d_lock);
1348 spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
1349 list_move(&dn->d_u.d_child, &parent->d_subdirs);
1350 spin_unlock(&dn->d_lock);
1351 spin_unlock(&parent->d_lock);
1352 }
1353
1354 di = dn->d_fsdata;
1355 di->offset = ceph_make_fpos(frag, i + r_readdir_offset);
1356
1357 /* inode */
1358 if (dn->d_inode) {
1359 in = dn->d_inode;
1360 } else {
1361 in = ceph_get_inode(parent->d_sb, vino);
1362 if (IS_ERR(in)) {
1363 dout("new_inode badness\n");
1364 d_drop(dn);
1365 dput(dn);
1366 err = PTR_ERR(in);
1367 goto out;
1368 }
1369 dn = splice_dentry(dn, in, NULL, false);
1370 if (IS_ERR(dn))
1371 dn = NULL;
1372 }
1373
1374 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1375 req->r_request_started, -1,
1376 &req->r_caps_reservation) < 0) {
1377 pr_err("fill_inode badness on %p\n", in);
1378 goto next_item;
1379 }
1380 if (dn)
1381 update_dentry_lease(dn, rinfo->dir_dlease[i],
1382 req->r_session,
1383 req->r_request_started);
1384 next_item:
1385 if (dn)
1386 dput(dn);
1387 }
1388 req->r_did_prepopulate = true;
1389
1390 out:
1391 if (snapdir) {
1392 iput(snapdir);
1393 dput(parent);
1394 }
1395 dout("readdir_prepopulate done\n");
1396 return err;
1397 }
1398
1399 int ceph_inode_set_size(struct inode *inode, loff_t size)
1400 {
1401 struct ceph_inode_info *ci = ceph_inode(inode);
1402 int ret = 0;
1403
1404 spin_lock(&ci->i_ceph_lock);
1405 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1406 inode->i_size = size;
1407 inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1408
1409 /* tell the MDS if we are approaching max_size */
1410 if ((size << 1) >= ci->i_max_size &&
1411 (ci->i_reported_size << 1) < ci->i_max_size)
1412 ret = 1;
1413
1414 spin_unlock(&ci->i_ceph_lock);
1415 return ret;
1416 }
1417
1418 /*
1419 * Write back inode data in a worker thread. (This can't be done
1420 * in the message handler context.)
1421 */
1422 void ceph_queue_writeback(struct inode *inode)
1423 {
1424 ihold(inode);
1425 if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1426 &ceph_inode(inode)->i_wb_work)) {
1427 dout("ceph_queue_writeback %p\n", inode);
1428 } else {
1429 dout("ceph_queue_writeback %p failed\n", inode);
1430 iput(inode);
1431 }
1432 }
1433
1434 static void ceph_writeback_work(struct work_struct *work)
1435 {
1436 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1437 i_wb_work);
1438 struct inode *inode = &ci->vfs_inode;
1439
1440 dout("writeback %p\n", inode);
1441 filemap_fdatawrite(&inode->i_data);
1442 iput(inode);
1443 }
1444
1445 /*
1446 * queue an async invalidation
1447 */
1448 void ceph_queue_invalidate(struct inode *inode)
1449 {
1450 ihold(inode);
1451 if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1452 &ceph_inode(inode)->i_pg_inv_work)) {
1453 dout("ceph_queue_invalidate %p\n", inode);
1454 } else {
1455 dout("ceph_queue_invalidate %p failed\n", inode);
1456 iput(inode);
1457 }
1458 }
1459
1460 /*
1461 * Invalidate inode pages in a worker thread. (This can't be done
1462 * in the message handler context.)
1463 */
1464 static void ceph_invalidate_work(struct work_struct *work)
1465 {
1466 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1467 i_pg_inv_work);
1468 struct inode *inode = &ci->vfs_inode;
1469 u32 orig_gen;
1470 int check = 0;
1471
1472 mutex_lock(&ci->i_truncate_mutex);
1473 spin_lock(&ci->i_ceph_lock);
1474 dout("invalidate_pages %p gen %d revoking %d\n", inode,
1475 ci->i_rdcache_gen, ci->i_rdcache_revoking);
1476 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1477 /* nevermind! */
1478 spin_unlock(&ci->i_ceph_lock);
1479 mutex_unlock(&ci->i_truncate_mutex);
1480 goto out;
1481 }
1482 orig_gen = ci->i_rdcache_gen;
1483 spin_unlock(&ci->i_ceph_lock);
1484
1485 truncate_inode_pages(inode->i_mapping, 0);
1486
1487 spin_lock(&ci->i_ceph_lock);
1488 if (orig_gen == ci->i_rdcache_gen &&
1489 orig_gen == ci->i_rdcache_revoking) {
1490 dout("invalidate_pages %p gen %d successful\n", inode,
1491 ci->i_rdcache_gen);
1492 ci->i_rdcache_revoking--;
1493 check = 1;
1494 } else {
1495 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1496 inode, orig_gen, ci->i_rdcache_gen,
1497 ci->i_rdcache_revoking);
1498 }
1499 spin_unlock(&ci->i_ceph_lock);
1500 mutex_unlock(&ci->i_truncate_mutex);
1501
1502 if (check)
1503 ceph_check_caps(ci, 0, NULL);
1504 out:
1505 iput(inode);
1506 }
1507
1508
1509 /*
1510 * called by trunc_wq;
1511 *
1512 * We also truncate in a separate thread as well.
1513 */
1514 static void ceph_vmtruncate_work(struct work_struct *work)
1515 {
1516 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1517 i_vmtruncate_work);
1518 struct inode *inode = &ci->vfs_inode;
1519
1520 dout("vmtruncate_work %p\n", inode);
1521 __ceph_do_pending_vmtruncate(inode);
1522 iput(inode);
1523 }
1524
1525 /*
1526 * Queue an async vmtruncate. If we fail to queue work, we will handle
1527 * the truncation the next time we call __ceph_do_pending_vmtruncate.
1528 */
1529 void ceph_queue_vmtruncate(struct inode *inode)
1530 {
1531 struct ceph_inode_info *ci = ceph_inode(inode);
1532
1533 ihold(inode);
1534
1535 if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1536 &ci->i_vmtruncate_work)) {
1537 dout("ceph_queue_vmtruncate %p\n", inode);
1538 } else {
1539 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1540 inode, ci->i_truncate_pending);
1541 iput(inode);
1542 }
1543 }
1544
1545 /*
1546 * Make sure any pending truncation is applied before doing anything
1547 * that may depend on it.
1548 */
1549 void __ceph_do_pending_vmtruncate(struct inode *inode)
1550 {
1551 struct ceph_inode_info *ci = ceph_inode(inode);
1552 u64 to;
1553 int wrbuffer_refs, finish = 0;
1554
1555 mutex_lock(&ci->i_truncate_mutex);
1556 retry:
1557 spin_lock(&ci->i_ceph_lock);
1558 if (ci->i_truncate_pending == 0) {
1559 dout("__do_pending_vmtruncate %p none pending\n", inode);
1560 spin_unlock(&ci->i_ceph_lock);
1561 mutex_unlock(&ci->i_truncate_mutex);
1562 return;
1563 }
1564
1565 /*
1566 * make sure any dirty snapped pages are flushed before we
1567 * possibly truncate them.. so write AND block!
1568 */
1569 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1570 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1571 inode);
1572 spin_unlock(&ci->i_ceph_lock);
1573 filemap_write_and_wait_range(&inode->i_data, 0,
1574 inode->i_sb->s_maxbytes);
1575 goto retry;
1576 }
1577
1578 /* there should be no reader or writer */
1579 WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1580
1581 to = ci->i_truncate_size;
1582 wrbuffer_refs = ci->i_wrbuffer_ref;
1583 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1584 ci->i_truncate_pending, to);
1585 spin_unlock(&ci->i_ceph_lock);
1586
1587 truncate_inode_pages(inode->i_mapping, to);
1588
1589 spin_lock(&ci->i_ceph_lock);
1590 if (to == ci->i_truncate_size) {
1591 ci->i_truncate_pending = 0;
1592 finish = 1;
1593 }
1594 spin_unlock(&ci->i_ceph_lock);
1595 if (!finish)
1596 goto retry;
1597
1598 mutex_unlock(&ci->i_truncate_mutex);
1599
1600 if (wrbuffer_refs == 0)
1601 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1602
1603 wake_up_all(&ci->i_cap_wq);
1604 }
1605
1606 /*
1607 * symlinks
1608 */
1609 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1610 {
1611 struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1612 nd_set_link(nd, ci->i_symlink);
1613 return NULL;
1614 }
1615
1616 static const struct inode_operations ceph_symlink_iops = {
1617 .readlink = generic_readlink,
1618 .follow_link = ceph_sym_follow_link,
1619 .setattr = ceph_setattr,
1620 .getattr = ceph_getattr,
1621 .setxattr = ceph_setxattr,
1622 .getxattr = ceph_getxattr,
1623 .listxattr = ceph_listxattr,
1624 .removexattr = ceph_removexattr,
1625 };
1626
1627 /*
1628 * setattr
1629 */
1630 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1631 {
1632 struct inode *inode = dentry->d_inode;
1633 struct ceph_inode_info *ci = ceph_inode(inode);
1634 struct inode *parent_inode;
1635 const unsigned int ia_valid = attr->ia_valid;
1636 struct ceph_mds_request *req;
1637 struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1638 int issued;
1639 int release = 0, dirtied = 0;
1640 int mask = 0;
1641 int err = 0;
1642 int inode_dirty_flags = 0;
1643
1644 if (ceph_snap(inode) != CEPH_NOSNAP)
1645 return -EROFS;
1646
1647 err = inode_change_ok(inode, attr);
1648 if (err != 0)
1649 return err;
1650
1651 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1652 USE_AUTH_MDS);
1653 if (IS_ERR(req))
1654 return PTR_ERR(req);
1655
1656 spin_lock(&ci->i_ceph_lock);
1657 issued = __ceph_caps_issued(ci, NULL);
1658 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1659
1660 if (ia_valid & ATTR_UID) {
1661 dout("setattr %p uid %d -> %d\n", inode,
1662 from_kuid(&init_user_ns, inode->i_uid),
1663 from_kuid(&init_user_ns, attr->ia_uid));
1664 if (issued & CEPH_CAP_AUTH_EXCL) {
1665 inode->i_uid = attr->ia_uid;
1666 dirtied |= CEPH_CAP_AUTH_EXCL;
1667 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1668 !uid_eq(attr->ia_uid, inode->i_uid)) {
1669 req->r_args.setattr.uid = cpu_to_le32(
1670 from_kuid(&init_user_ns, attr->ia_uid));
1671 mask |= CEPH_SETATTR_UID;
1672 release |= CEPH_CAP_AUTH_SHARED;
1673 }
1674 }
1675 if (ia_valid & ATTR_GID) {
1676 dout("setattr %p gid %d -> %d\n", inode,
1677 from_kgid(&init_user_ns, inode->i_gid),
1678 from_kgid(&init_user_ns, attr->ia_gid));
1679 if (issued & CEPH_CAP_AUTH_EXCL) {
1680 inode->i_gid = attr->ia_gid;
1681 dirtied |= CEPH_CAP_AUTH_EXCL;
1682 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1683 !gid_eq(attr->ia_gid, inode->i_gid)) {
1684 req->r_args.setattr.gid = cpu_to_le32(
1685 from_kgid(&init_user_ns, attr->ia_gid));
1686 mask |= CEPH_SETATTR_GID;
1687 release |= CEPH_CAP_AUTH_SHARED;
1688 }
1689 }
1690 if (ia_valid & ATTR_MODE) {
1691 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1692 attr->ia_mode);
1693 if (issued & CEPH_CAP_AUTH_EXCL) {
1694 inode->i_mode = attr->ia_mode;
1695 dirtied |= CEPH_CAP_AUTH_EXCL;
1696 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1697 attr->ia_mode != inode->i_mode) {
1698 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1699 mask |= CEPH_SETATTR_MODE;
1700 release |= CEPH_CAP_AUTH_SHARED;
1701 }
1702 }
1703
1704 if (ia_valid & ATTR_ATIME) {
1705 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1706 inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1707 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1708 if (issued & CEPH_CAP_FILE_EXCL) {
1709 ci->i_time_warp_seq++;
1710 inode->i_atime = attr->ia_atime;
1711 dirtied |= CEPH_CAP_FILE_EXCL;
1712 } else if ((issued & CEPH_CAP_FILE_WR) &&
1713 timespec_compare(&inode->i_atime,
1714 &attr->ia_atime) < 0) {
1715 inode->i_atime = attr->ia_atime;
1716 dirtied |= CEPH_CAP_FILE_WR;
1717 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1718 !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1719 ceph_encode_timespec(&req->r_args.setattr.atime,
1720 &attr->ia_atime);
1721 mask |= CEPH_SETATTR_ATIME;
1722 release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1723 CEPH_CAP_FILE_WR;
1724 }
1725 }
1726 if (ia_valid & ATTR_MTIME) {
1727 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1728 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1729 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1730 if (issued & CEPH_CAP_FILE_EXCL) {
1731 ci->i_time_warp_seq++;
1732 inode->i_mtime = attr->ia_mtime;
1733 dirtied |= CEPH_CAP_FILE_EXCL;
1734 } else if ((issued & CEPH_CAP_FILE_WR) &&
1735 timespec_compare(&inode->i_mtime,
1736 &attr->ia_mtime) < 0) {
1737 inode->i_mtime = attr->ia_mtime;
1738 dirtied |= CEPH_CAP_FILE_WR;
1739 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1740 !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1741 ceph_encode_timespec(&req->r_args.setattr.mtime,
1742 &attr->ia_mtime);
1743 mask |= CEPH_SETATTR_MTIME;
1744 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1745 CEPH_CAP_FILE_WR;
1746 }
1747 }
1748 if (ia_valid & ATTR_SIZE) {
1749 dout("setattr %p size %lld -> %lld\n", inode,
1750 inode->i_size, attr->ia_size);
1751 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1752 err = -EINVAL;
1753 goto out;
1754 }
1755 if ((issued & CEPH_CAP_FILE_EXCL) &&
1756 attr->ia_size > inode->i_size) {
1757 inode->i_size = attr->ia_size;
1758 inode->i_blocks =
1759 (attr->ia_size + (1 << 9) - 1) >> 9;
1760 inode->i_ctime = attr->ia_ctime;
1761 ci->i_reported_size = attr->ia_size;
1762 dirtied |= CEPH_CAP_FILE_EXCL;
1763 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1764 attr->ia_size != inode->i_size) {
1765 req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1766 req->r_args.setattr.old_size =
1767 cpu_to_le64(inode->i_size);
1768 mask |= CEPH_SETATTR_SIZE;
1769 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1770 CEPH_CAP_FILE_WR;
1771 }
1772 }
1773
1774 /* these do nothing */
1775 if (ia_valid & ATTR_CTIME) {
1776 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1777 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1778 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1779 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1780 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1781 only ? "ctime only" : "ignored");
1782 inode->i_ctime = attr->ia_ctime;
1783 if (only) {
1784 /*
1785 * if kernel wants to dirty ctime but nothing else,
1786 * we need to choose a cap to dirty under, or do
1787 * a almost-no-op setattr
1788 */
1789 if (issued & CEPH_CAP_AUTH_EXCL)
1790 dirtied |= CEPH_CAP_AUTH_EXCL;
1791 else if (issued & CEPH_CAP_FILE_EXCL)
1792 dirtied |= CEPH_CAP_FILE_EXCL;
1793 else if (issued & CEPH_CAP_XATTR_EXCL)
1794 dirtied |= CEPH_CAP_XATTR_EXCL;
1795 else
1796 mask |= CEPH_SETATTR_CTIME;
1797 }
1798 }
1799 if (ia_valid & ATTR_FILE)
1800 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1801
1802 if (dirtied) {
1803 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied);
1804 inode->i_ctime = CURRENT_TIME;
1805 }
1806
1807 release &= issued;
1808 spin_unlock(&ci->i_ceph_lock);
1809
1810 if (inode_dirty_flags)
1811 __mark_inode_dirty(inode, inode_dirty_flags);
1812
1813 if (mask) {
1814 req->r_inode = inode;
1815 ihold(inode);
1816 req->r_inode_drop = release;
1817 req->r_args.setattr.mask = cpu_to_le32(mask);
1818 req->r_num_caps = 1;
1819 parent_inode = ceph_get_dentry_parent_inode(dentry);
1820 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1821 iput(parent_inode);
1822 }
1823 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1824 ceph_cap_string(dirtied), mask);
1825
1826 ceph_mdsc_put_request(req);
1827 if (mask & CEPH_SETATTR_SIZE)
1828 __ceph_do_pending_vmtruncate(inode);
1829 return err;
1830 out:
1831 spin_unlock(&ci->i_ceph_lock);
1832 ceph_mdsc_put_request(req);
1833 return err;
1834 }
1835
1836 /*
1837 * Verify that we have a lease on the given mask. If not,
1838 * do a getattr against an mds.
1839 */
1840 int ceph_do_getattr(struct inode *inode, int mask)
1841 {
1842 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
1843 struct ceph_mds_client *mdsc = fsc->mdsc;
1844 struct ceph_mds_request *req;
1845 int err;
1846
1847 if (ceph_snap(inode) == CEPH_SNAPDIR) {
1848 dout("do_getattr inode %p SNAPDIR\n", inode);
1849 return 0;
1850 }
1851
1852 dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode);
1853 if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1854 return 0;
1855
1856 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1857 if (IS_ERR(req))
1858 return PTR_ERR(req);
1859 req->r_inode = inode;
1860 ihold(inode);
1861 req->r_num_caps = 1;
1862 req->r_args.getattr.mask = cpu_to_le32(mask);
1863 err = ceph_mdsc_do_request(mdsc, NULL, req);
1864 ceph_mdsc_put_request(req);
1865 dout("do_getattr result=%d\n", err);
1866 return err;
1867 }
1868
1869
1870 /*
1871 * Check inode permissions. We verify we have a valid value for
1872 * the AUTH cap, then call the generic handler.
1873 */
1874 int ceph_permission(struct inode *inode, int mask)
1875 {
1876 int err;
1877
1878 if (mask & MAY_NOT_BLOCK)
1879 return -ECHILD;
1880
1881 err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1882
1883 if (!err)
1884 err = generic_permission(inode, mask);
1885 return err;
1886 }
1887
1888 /*
1889 * Get all attributes. Hopefully somedata we'll have a statlite()
1890 * and can limit the fields we require to be accurate.
1891 */
1892 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1893 struct kstat *stat)
1894 {
1895 struct inode *inode = dentry->d_inode;
1896 struct ceph_inode_info *ci = ceph_inode(inode);
1897 int err;
1898
1899 err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1900 if (!err) {
1901 generic_fillattr(inode, stat);
1902 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
1903 if (ceph_snap(inode) != CEPH_NOSNAP)
1904 stat->dev = ceph_snap(inode);
1905 else
1906 stat->dev = 0;
1907 if (S_ISDIR(inode->i_mode)) {
1908 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
1909 RBYTES))
1910 stat->size = ci->i_rbytes;
1911 else
1912 stat->size = ci->i_files + ci->i_subdirs;
1913 stat->blocks = 0;
1914 stat->blksize = 65536;
1915 }
1916 }
1917 return err;
1918 }
Linux kernel - Deliverables
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