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resource: ability to resize an allocated resource
[zen-stable.git] / fs / ceph / inode.c
blobd8858e96ab1870d62f1597185f87a2c8fb93f34a
1 #include <linux/ceph/ceph_debug.h>
2
3 #include <linux/module.h>
4 #include <linux/fs.h>
5 #include <linux/slab.h>
6 #include <linux/string.h>
7 #include <linux/uaccess.h>
8 #include <linux/kernel.h>
9 #include <linux/namei.h>
10 #include <linux/writeback.h>
11 #include <linux/vmalloc.h>
12 #include <linux/pagevec.h>
13
14 #include "super.h"
15 #include "mds_client.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 ci->i_version = 0;
302 ci->i_time_warp_seq = 0;
303 ci->i_ceph_flags = 0;
304 ci->i_release_count = 0;
305 ci->i_symlink = NULL;
306
307 memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
308
309 ci->i_fragtree = RB_ROOT;
310 mutex_init(&ci->i_fragtree_mutex);
311
312 ci->i_xattrs.blob = NULL;
313 ci->i_xattrs.prealloc_blob = NULL;
314 ci->i_xattrs.dirty = false;
315 ci->i_xattrs.index = RB_ROOT;
316 ci->i_xattrs.count = 0;
317 ci->i_xattrs.names_size = 0;
318 ci->i_xattrs.vals_size = 0;
319 ci->i_xattrs.version = 0;
320 ci->i_xattrs.index_version = 0;
321
322 ci->i_caps = RB_ROOT;
323 ci->i_auth_cap = NULL;
324 ci->i_dirty_caps = 0;
325 ci->i_flushing_caps = 0;
326 INIT_LIST_HEAD(&ci->i_dirty_item);
327 INIT_LIST_HEAD(&ci->i_flushing_item);
328 ci->i_cap_flush_seq = 0;
329 ci->i_cap_flush_last_tid = 0;
330 memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
331 init_waitqueue_head(&ci->i_cap_wq);
332 ci->i_hold_caps_min = 0;
333 ci->i_hold_caps_max = 0;
334 INIT_LIST_HEAD(&ci->i_cap_delay_list);
335 ci->i_cap_exporting_mds = 0;
336 ci->i_cap_exporting_mseq = 0;
337 ci->i_cap_exporting_issued = 0;
338 INIT_LIST_HEAD(&ci->i_cap_snaps);
339 ci->i_head_snapc = NULL;
340 ci->i_snap_caps = 0;
341
342 for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
343 ci->i_nr_by_mode[i] = 0;
344
345 ci->i_truncate_seq = 0;
346 ci->i_truncate_size = 0;
347 ci->i_truncate_pending = 0;
348
349 ci->i_max_size = 0;
350 ci->i_reported_size = 0;
351 ci->i_wanted_max_size = 0;
352 ci->i_requested_max_size = 0;
353
354 ci->i_pin_ref = 0;
355 ci->i_rd_ref = 0;
356 ci->i_rdcache_ref = 0;
357 ci->i_wr_ref = 0;
358 ci->i_wb_ref = 0;
359 ci->i_wrbuffer_ref = 0;
360 ci->i_wrbuffer_ref_head = 0;
361 ci->i_shared_gen = 0;
362 ci->i_rdcache_gen = 0;
363 ci->i_rdcache_revoking = 0;
364
365 INIT_LIST_HEAD(&ci->i_unsafe_writes);
366 INIT_LIST_HEAD(&ci->i_unsafe_dirops);
367 spin_lock_init(&ci->i_unsafe_lock);
368
369 ci->i_snap_realm = NULL;
370 INIT_LIST_HEAD(&ci->i_snap_realm_item);
371 INIT_LIST_HEAD(&ci->i_snap_flush_item);
372
373 INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
374 INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
375
376 INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
377
378 return &ci->vfs_inode;
379 }
380
381 static void ceph_i_callback(struct rcu_head *head)
382 {
383 struct inode *inode = container_of(head, struct inode, i_rcu);
384 struct ceph_inode_info *ci = ceph_inode(inode);
385
386 INIT_LIST_HEAD(&inode->i_dentry);
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, implemented;
564 struct timespec mtime, atime, ctime;
565 u32 nsplits;
566 struct ceph_buffer *xattr_blob = NULL;
567 int err = 0;
568 int queue_trunc = 0;
569
570 dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
571 inode, ceph_vinop(inode), le64_to_cpu(info->version),
572 ci->i_version);
573
574 /*
575 * prealloc xattr data, if it looks like we'll need it. only
576 * if len > 4 (meaning there are actually xattrs; the first 4
577 * bytes are the xattr count).
578 */
579 if (iinfo->xattr_len > 4) {
580 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
581 if (!xattr_blob)
582 pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
583 iinfo->xattr_len);
584 }
585
586 spin_lock(&inode->i_lock);
587
588 /*
589 * provided version will be odd if inode value is projected,
590 * even if stable. skip the update if we have newer stable
591 * info (ours>=theirs, e.g. due to racing mds replies), unless
592 * we are getting projected (unstable) info (in which case the
593 * version is odd, and we want ours>theirs).
594 * us them
595 * 2 2 skip
596 * 3 2 skip
597 * 3 3 update
598 */
599 if (le64_to_cpu(info->version) > 0 &&
600 (ci->i_version & ~1) >= le64_to_cpu(info->version))
601 goto no_change;
602
603 issued = __ceph_caps_issued(ci, &implemented);
604 issued |= implemented | __ceph_caps_dirty(ci);
605
606 /* update inode */
607 ci->i_version = le64_to_cpu(info->version);
608 inode->i_version++;
609 inode->i_rdev = le32_to_cpu(info->rdev);
610
611 if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
612 inode->i_mode = le32_to_cpu(info->mode);
613 inode->i_uid = le32_to_cpu(info->uid);
614 inode->i_gid = le32_to_cpu(info->gid);
615 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
616 inode->i_uid, inode->i_gid);
617 }
618
619 if ((issued & CEPH_CAP_LINK_EXCL) == 0)
620 inode->i_nlink = le32_to_cpu(info->nlink);
621
622 /* be careful with mtime, atime, size */
623 ceph_decode_timespec(&atime, &info->atime);
624 ceph_decode_timespec(&mtime, &info->mtime);
625 ceph_decode_timespec(&ctime, &info->ctime);
626 queue_trunc = ceph_fill_file_size(inode, issued,
627 le32_to_cpu(info->truncate_seq),
628 le64_to_cpu(info->truncate_size),
629 le64_to_cpu(info->size));
630 ceph_fill_file_time(inode, issued,
631 le32_to_cpu(info->time_warp_seq),
632 &ctime, &mtime, &atime);
633
634 /* only update max_size on auth cap */
635 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
636 ci->i_max_size != le64_to_cpu(info->max_size)) {
637 dout("max_size %lld -> %llu\n", ci->i_max_size,
638 le64_to_cpu(info->max_size));
639 ci->i_max_size = le64_to_cpu(info->max_size);
640 }
641
642 ci->i_layout = info->layout;
643 inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
644
645 /* xattrs */
646 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
647 if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
648 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
649 if (ci->i_xattrs.blob)
650 ceph_buffer_put(ci->i_xattrs.blob);
651 ci->i_xattrs.blob = xattr_blob;
652 if (xattr_blob)
653 memcpy(ci->i_xattrs.blob->vec.iov_base,
654 iinfo->xattr_data, iinfo->xattr_len);
655 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
656 xattr_blob = NULL;
657 }
658
659 inode->i_mapping->a_ops = &ceph_aops;
660 inode->i_mapping->backing_dev_info =
661 &ceph_sb_to_client(inode->i_sb)->backing_dev_info;
662
663 switch (inode->i_mode & S_IFMT) {
664 case S_IFIFO:
665 case S_IFBLK:
666 case S_IFCHR:
667 case S_IFSOCK:
668 init_special_inode(inode, inode->i_mode, inode->i_rdev);
669 inode->i_op = &ceph_file_iops;
670 break;
671 case S_IFREG:
672 inode->i_op = &ceph_file_iops;
673 inode->i_fop = &ceph_file_fops;
674 break;
675 case S_IFLNK:
676 inode->i_op = &ceph_symlink_iops;
677 if (!ci->i_symlink) {
678 int symlen = iinfo->symlink_len;
679 char *sym;
680
681 BUG_ON(symlen != inode->i_size);
682 spin_unlock(&inode->i_lock);
683
684 err = -ENOMEM;
685 sym = kmalloc(symlen+1, GFP_NOFS);
686 if (!sym)
687 goto out;
688 memcpy(sym, iinfo->symlink, symlen);
689 sym[symlen] = 0;
690
691 spin_lock(&inode->i_lock);
692 if (!ci->i_symlink)
693 ci->i_symlink = sym;
694 else
695 kfree(sym); /* lost a race */
696 }
697 break;
698 case S_IFDIR:
699 inode->i_op = &ceph_dir_iops;
700 inode->i_fop = &ceph_dir_fops;
701
702 ci->i_dir_layout = iinfo->dir_layout;
703
704 ci->i_files = le64_to_cpu(info->files);
705 ci->i_subdirs = le64_to_cpu(info->subdirs);
706 ci->i_rbytes = le64_to_cpu(info->rbytes);
707 ci->i_rfiles = le64_to_cpu(info->rfiles);
708 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
709 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
710
711 /* set dir completion flag? */
712 if (ci->i_files == 0 && ci->i_subdirs == 0 &&
713 ceph_snap(inode) == CEPH_NOSNAP &&
714 (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
715 (issued & CEPH_CAP_FILE_EXCL) == 0 &&
716 (ci->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
717 dout(" marking %p complete (empty)\n", inode);
718 /* ci->i_ceph_flags |= CEPH_I_COMPLETE; */
719 ci->i_max_offset = 2;
720 }
721 break;
722 default:
723 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
724 ceph_vinop(inode), inode->i_mode);
725 }
726
727 no_change:
728 spin_unlock(&inode->i_lock);
729
730 /* queue truncate if we saw i_size decrease */
731 if (queue_trunc)
732 ceph_queue_vmtruncate(inode);
733
734 /* populate frag tree */
735 /* FIXME: move me up, if/when version reflects fragtree changes */
736 nsplits = le32_to_cpu(info->fragtree.nsplits);
737 mutex_lock(&ci->i_fragtree_mutex);
738 for (i = 0; i < nsplits; i++) {
739 u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
740 struct ceph_inode_frag *frag = __get_or_create_frag(ci, id);
741
742 if (IS_ERR(frag))
743 continue;
744 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
745 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
746 }
747 mutex_unlock(&ci->i_fragtree_mutex);
748
749 /* were we issued a capability? */
750 if (info->cap.caps) {
751 if (ceph_snap(inode) == CEPH_NOSNAP) {
752 ceph_add_cap(inode, session,
753 le64_to_cpu(info->cap.cap_id),
754 cap_fmode,
755 le32_to_cpu(info->cap.caps),
756 le32_to_cpu(info->cap.wanted),
757 le32_to_cpu(info->cap.seq),
758 le32_to_cpu(info->cap.mseq),
759 le64_to_cpu(info->cap.realm),
760 info->cap.flags,
761 caps_reservation);
762 } else {
763 spin_lock(&inode->i_lock);
764 dout(" %p got snap_caps %s\n", inode,
765 ceph_cap_string(le32_to_cpu(info->cap.caps)));
766 ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
767 if (cap_fmode >= 0)
768 __ceph_get_fmode(ci, cap_fmode);
769 spin_unlock(&inode->i_lock);
770 }
771 } else if (cap_fmode >= 0) {
772 pr_warning("mds issued no caps on %llx.%llx\n",
773 ceph_vinop(inode));
774 __ceph_get_fmode(ci, cap_fmode);
775 }
776
777 /* update delegation info? */
778 if (dirinfo)
779 ceph_fill_dirfrag(inode, dirinfo);
780
781 err = 0;
782
783 out:
784 if (xattr_blob)
785 ceph_buffer_put(xattr_blob);
786 return err;
787 }
788
789 /*
790 * caller should hold session s_mutex.
791 */
792 static void update_dentry_lease(struct dentry *dentry,
793 struct ceph_mds_reply_lease *lease,
794 struct ceph_mds_session *session,
795 unsigned long from_time)
796 {
797 struct ceph_dentry_info *di = ceph_dentry(dentry);
798 long unsigned duration = le32_to_cpu(lease->duration_ms);
799 long unsigned ttl = from_time + (duration * HZ) / 1000;
800 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
801 struct inode *dir;
802
803 /* only track leases on regular dentries */
804 if (dentry->d_op != &ceph_dentry_ops)
805 return;
806
807 spin_lock(&dentry->d_lock);
808 dout("update_dentry_lease %p mask %d duration %lu ms ttl %lu\n",
809 dentry, le16_to_cpu(lease->mask), duration, ttl);
810
811 /* make lease_rdcache_gen match directory */
812 dir = dentry->d_parent->d_inode;
813 di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
814
815 if (lease->mask == 0)
816 goto out_unlock;
817
818 if (di->lease_gen == session->s_cap_gen &&
819 time_before(ttl, dentry->d_time))
820 goto out_unlock; /* we already have a newer lease. */
821
822 if (di->lease_session && di->lease_session != session)
823 goto out_unlock;
824
825 ceph_dentry_lru_touch(dentry);
826
827 if (!di->lease_session)
828 di->lease_session = ceph_get_mds_session(session);
829 di->lease_gen = session->s_cap_gen;
830 di->lease_seq = le32_to_cpu(lease->seq);
831 di->lease_renew_after = half_ttl;
832 di->lease_renew_from = 0;
833 dentry->d_time = ttl;
834 out_unlock:
835 spin_unlock(&dentry->d_lock);
836 return;
837 }
838
839 /*
840 * Set dentry's directory position based on the current dir's max, and
841 * order it in d_subdirs, so that dcache_readdir behaves.
842 */
843 static void ceph_set_dentry_offset(struct dentry *dn)
844 {
845 struct dentry *dir = dn->d_parent;
846 struct inode *inode = dn->d_parent->d_inode;
847 struct ceph_dentry_info *di;
848
849 BUG_ON(!inode);
850
851 di = ceph_dentry(dn);
852
853 spin_lock(&inode->i_lock);
854 if ((ceph_inode(inode)->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
855 spin_unlock(&inode->i_lock);
856 return;
857 }
858 di->offset = ceph_inode(inode)->i_max_offset++;
859 spin_unlock(&inode->i_lock);
860
861 spin_lock(&dir->d_lock);
862 spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
863 list_move(&dn->d_u.d_child, &dir->d_subdirs);
864 dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
865 dn->d_u.d_child.prev, dn->d_u.d_child.next);
866 spin_unlock(&dn->d_lock);
867 spin_unlock(&dir->d_lock);
868 }
869
870 /*
871 * splice a dentry to an inode.
872 * caller must hold directory i_mutex for this to be safe.
873 *
874 * we will only rehash the resulting dentry if @prehash is
875 * true; @prehash will be set to false (for the benefit of
876 * the caller) if we fail.
877 */
878 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
879 bool *prehash, bool set_offset)
880 {
881 struct dentry *realdn;
882
883 BUG_ON(dn->d_inode);
884
885 /* dn must be unhashed */
886 if (!d_unhashed(dn))
887 d_drop(dn);
888 realdn = d_materialise_unique(dn, in);
889 if (IS_ERR(realdn)) {
890 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
891 PTR_ERR(realdn), dn, in, ceph_vinop(in));
892 if (prehash)
893 *prehash = false; /* don't rehash on error */
894 dn = realdn; /* note realdn contains the error */
895 goto out;
896 } else if (realdn) {
897 dout("dn %p (%d) spliced with %p (%d) "
898 "inode %p ino %llx.%llx\n",
899 dn, dn->d_count,
900 realdn, realdn->d_count,
901 realdn->d_inode, ceph_vinop(realdn->d_inode));
902 dput(dn);
903 dn = realdn;
904 } else {
905 BUG_ON(!ceph_dentry(dn));
906 dout("dn %p attached to %p ino %llx.%llx\n",
907 dn, dn->d_inode, ceph_vinop(dn->d_inode));
908 }
909 if ((!prehash || *prehash) && d_unhashed(dn))
910 d_rehash(dn);
911 if (set_offset)
912 ceph_set_dentry_offset(dn);
913 out:
914 return dn;
915 }
916
917 /*
918 * Incorporate results into the local cache. This is either just
919 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
920 * after a lookup).
921 *
922 * A reply may contain
923 * a directory inode along with a dentry.
924 * and/or a target inode
925 *
926 * Called with snap_rwsem (read).
927 */
928 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
929 struct ceph_mds_session *session)
930 {
931 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
932 struct inode *in = NULL;
933 struct ceph_mds_reply_inode *ininfo;
934 struct ceph_vino vino;
935 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
936 int i = 0;
937 int err = 0;
938
939 dout("fill_trace %p is_dentry %d is_target %d\n", req,
940 rinfo->head->is_dentry, rinfo->head->is_target);
941
942 #if 0
943 /*
944 * Debugging hook:
945 *
946 * If we resend completed ops to a recovering mds, we get no
947 * trace. Since that is very rare, pretend this is the case
948 * to ensure the 'no trace' handlers in the callers behave.
949 *
950 * Fill in inodes unconditionally to avoid breaking cap
951 * invariants.
952 */
953 if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
954 pr_info("fill_trace faking empty trace on %lld %s\n",
955 req->r_tid, ceph_mds_op_name(rinfo->head->op));
956 if (rinfo->head->is_dentry) {
957 rinfo->head->is_dentry = 0;
958 err = fill_inode(req->r_locked_dir,
959 &rinfo->diri, rinfo->dirfrag,
960 session, req->r_request_started, -1);
961 }
962 if (rinfo->head->is_target) {
963 rinfo->head->is_target = 0;
964 ininfo = rinfo->targeti.in;
965 vino.ino = le64_to_cpu(ininfo->ino);
966 vino.snap = le64_to_cpu(ininfo->snapid);
967 in = ceph_get_inode(sb, vino);
968 err = fill_inode(in, &rinfo->targeti, NULL,
969 session, req->r_request_started,
970 req->r_fmode);
971 iput(in);
972 }
973 }
974 #endif
975
976 if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
977 dout("fill_trace reply is empty!\n");
978 if (rinfo->head->result == 0 && req->r_locked_dir)
979 ceph_invalidate_dir_request(req);
980 return 0;
981 }
982
983 if (rinfo->head->is_dentry) {
984 struct inode *dir = req->r_locked_dir;
985
986 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
987 session, req->r_request_started, -1,
988 &req->r_caps_reservation);
989 if (err < 0)
990 return err;
991 }
992
993 /*
994 * ignore null lease/binding on snapdir ENOENT, or else we
995 * will have trouble splicing in the virtual snapdir later
996 */
997 if (rinfo->head->is_dentry && !req->r_aborted &&
998 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
999 fsc->mount_options->snapdir_name,
1000 req->r_dentry->d_name.len))) {
1001 /*
1002 * lookup link rename : null -> possibly existing inode
1003 * mknod symlink mkdir : null -> new inode
1004 * unlink : linked -> null
1005 */
1006 struct inode *dir = req->r_locked_dir;
1007 struct dentry *dn = req->r_dentry;
1008 bool have_dir_cap, have_lease;
1009
1010 BUG_ON(!dn);
1011 BUG_ON(!dir);
1012 BUG_ON(dn->d_parent->d_inode != dir);
1013 BUG_ON(ceph_ino(dir) !=
1014 le64_to_cpu(rinfo->diri.in->ino));
1015 BUG_ON(ceph_snap(dir) !=
1016 le64_to_cpu(rinfo->diri.in->snapid));
1017
1018 /* do we have a lease on the whole dir? */
1019 have_dir_cap =
1020 (le32_to_cpu(rinfo->diri.in->cap.caps) &
1021 CEPH_CAP_FILE_SHARED);
1022
1023 /* do we have a dn lease? */
1024 have_lease = have_dir_cap ||
1025 (le16_to_cpu(rinfo->dlease->mask) &
1026 CEPH_LOCK_DN);
1027
1028 if (!have_lease)
1029 dout("fill_trace no dentry lease or dir cap\n");
1030
1031 /* rename? */
1032 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1033 dout(" src %p '%.*s' dst %p '%.*s'\n",
1034 req->r_old_dentry,
1035 req->r_old_dentry->d_name.len,
1036 req->r_old_dentry->d_name.name,
1037 dn, dn->d_name.len, dn->d_name.name);
1038 dout("fill_trace doing d_move %p -> %p\n",
1039 req->r_old_dentry, dn);
1040
1041 d_move(req->r_old_dentry, dn);
1042 dout(" src %p '%.*s' dst %p '%.*s'\n",
1043 req->r_old_dentry,
1044 req->r_old_dentry->d_name.len,
1045 req->r_old_dentry->d_name.name,
1046 dn, dn->d_name.len, dn->d_name.name);
1047
1048 /* ensure target dentry is invalidated, despite
1049 rehashing bug in vfs_rename_dir */
1050 ceph_invalidate_dentry_lease(dn);
1051
1052 /*
1053 * d_move() puts the renamed dentry at the end of
1054 * d_subdirs. We need to assign it an appropriate
1055 * directory offset so we can behave when holding
1056 * I_COMPLETE.
1057 */
1058 ceph_set_dentry_offset(req->r_old_dentry);
1059 dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1060 ceph_dentry(req->r_old_dentry)->offset);
1061
1062 dn = req->r_old_dentry; /* use old_dentry */
1063 in = dn->d_inode;
1064 }
1065
1066 /* null dentry? */
1067 if (!rinfo->head->is_target) {
1068 dout("fill_trace null dentry\n");
1069 if (dn->d_inode) {
1070 dout("d_delete %p\n", dn);
1071 d_delete(dn);
1072 } else {
1073 dout("d_instantiate %p NULL\n", dn);
1074 d_instantiate(dn, NULL);
1075 if (have_lease && d_unhashed(dn))
1076 d_rehash(dn);
1077 update_dentry_lease(dn, rinfo->dlease,
1078 session,
1079 req->r_request_started);
1080 }
1081 goto done;
1082 }
1083
1084 /* attach proper inode */
1085 ininfo = rinfo->targeti.in;
1086 vino.ino = le64_to_cpu(ininfo->ino);
1087 vino.snap = le64_to_cpu(ininfo->snapid);
1088 in = dn->d_inode;
1089 if (!in) {
1090 in = ceph_get_inode(sb, vino);
1091 if (IS_ERR(in)) {
1092 pr_err("fill_trace bad get_inode "
1093 "%llx.%llx\n", vino.ino, vino.snap);
1094 err = PTR_ERR(in);
1095 d_delete(dn);
1096 goto done;
1097 }
1098 dn = splice_dentry(dn, in, &have_lease, true);
1099 if (IS_ERR(dn)) {
1100 err = PTR_ERR(dn);
1101 goto done;
1102 }
1103 req->r_dentry = dn; /* may have spliced */
1104 ihold(in);
1105 } else if (ceph_ino(in) == vino.ino &&
1106 ceph_snap(in) == vino.snap) {
1107 ihold(in);
1108 } else {
1109 dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1110 dn, in, ceph_ino(in), ceph_snap(in),
1111 vino.ino, vino.snap);
1112 have_lease = false;
1113 in = NULL;
1114 }
1115
1116 if (have_lease)
1117 update_dentry_lease(dn, rinfo->dlease, session,
1118 req->r_request_started);
1119 dout(" final dn %p\n", dn);
1120 i++;
1121 } else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1122 req->r_op == CEPH_MDS_OP_MKSNAP) {
1123 struct dentry *dn = req->r_dentry;
1124
1125 /* fill out a snapdir LOOKUPSNAP dentry */
1126 BUG_ON(!dn);
1127 BUG_ON(!req->r_locked_dir);
1128 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1129 ininfo = rinfo->targeti.in;
1130 vino.ino = le64_to_cpu(ininfo->ino);
1131 vino.snap = le64_to_cpu(ininfo->snapid);
1132 in = ceph_get_inode(sb, vino);
1133 if (IS_ERR(in)) {
1134 pr_err("fill_inode get_inode badness %llx.%llx\n",
1135 vino.ino, vino.snap);
1136 err = PTR_ERR(in);
1137 d_delete(dn);
1138 goto done;
1139 }
1140 dout(" linking snapped dir %p to dn %p\n", in, dn);
1141 dn = splice_dentry(dn, in, NULL, true);
1142 if (IS_ERR(dn)) {
1143 err = PTR_ERR(dn);
1144 goto done;
1145 }
1146 req->r_dentry = dn; /* may have spliced */
1147 ihold(in);
1148 rinfo->head->is_dentry = 1; /* fool notrace handlers */
1149 }
1150
1151 if (rinfo->head->is_target) {
1152 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1153 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1154
1155 if (in == NULL || ceph_ino(in) != vino.ino ||
1156 ceph_snap(in) != vino.snap) {
1157 in = ceph_get_inode(sb, vino);
1158 if (IS_ERR(in)) {
1159 err = PTR_ERR(in);
1160 goto done;
1161 }
1162 }
1163 req->r_target_inode = in;
1164
1165 err = fill_inode(in,
1166 &rinfo->targeti, NULL,
1167 session, req->r_request_started,
1168 (le32_to_cpu(rinfo->head->result) == 0) ?
1169 req->r_fmode : -1,
1170 &req->r_caps_reservation);
1171 if (err < 0) {
1172 pr_err("fill_inode badness %p %llx.%llx\n",
1173 in, ceph_vinop(in));
1174 goto done;
1175 }
1176 }
1177
1178 done:
1179 dout("fill_trace done err=%d\n", err);
1180 return err;
1181 }
1182
1183 /*
1184 * Prepopulate our cache with readdir results, leases, etc.
1185 */
1186 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1187 struct ceph_mds_session *session)
1188 {
1189 struct dentry *parent = req->r_dentry;
1190 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1191 struct qstr dname;
1192 struct dentry *dn;
1193 struct inode *in;
1194 int err = 0, i;
1195 struct inode *snapdir = NULL;
1196 struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1197 u64 frag = le32_to_cpu(rhead->args.readdir.frag);
1198 struct ceph_dentry_info *di;
1199
1200 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1201 snapdir = ceph_get_snapdir(parent->d_inode);
1202 parent = d_find_alias(snapdir);
1203 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1204 rinfo->dir_nr, parent);
1205 } else {
1206 dout("readdir_prepopulate %d items under dn %p\n",
1207 rinfo->dir_nr, parent);
1208 if (rinfo->dir_dir)
1209 ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1210 }
1211
1212 for (i = 0; i < rinfo->dir_nr; i++) {
1213 struct ceph_vino vino;
1214
1215 dname.name = rinfo->dir_dname[i];
1216 dname.len = rinfo->dir_dname_len[i];
1217 dname.hash = full_name_hash(dname.name, dname.len);
1218
1219 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1220 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1221
1222 retry_lookup:
1223 dn = d_lookup(parent, &dname);
1224 dout("d_lookup on parent=%p name=%.*s got %p\n",
1225 parent, dname.len, dname.name, dn);
1226
1227 if (!dn) {
1228 dn = d_alloc(parent, &dname);
1229 dout("d_alloc %p '%.*s' = %p\n", parent,
1230 dname.len, dname.name, dn);
1231 if (dn == NULL) {
1232 dout("d_alloc badness\n");
1233 err = -ENOMEM;
1234 goto out;
1235 }
1236 err = ceph_init_dentry(dn);
1237 if (err < 0) {
1238 dput(dn);
1239 goto out;
1240 }
1241 } else if (dn->d_inode &&
1242 (ceph_ino(dn->d_inode) != vino.ino ||
1243 ceph_snap(dn->d_inode) != vino.snap)) {
1244 dout(" dn %p points to wrong inode %p\n",
1245 dn, dn->d_inode);
1246 d_delete(dn);
1247 dput(dn);
1248 goto retry_lookup;
1249 } else {
1250 /* reorder parent's d_subdirs */
1251 spin_lock(&parent->d_lock);
1252 spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
1253 list_move(&dn->d_u.d_child, &parent->d_subdirs);
1254 spin_unlock(&dn->d_lock);
1255 spin_unlock(&parent->d_lock);
1256 }
1257
1258 di = dn->d_fsdata;
1259 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1260
1261 /* inode */
1262 if (dn->d_inode) {
1263 in = dn->d_inode;
1264 } else {
1265 in = ceph_get_inode(parent->d_sb, vino);
1266 if (IS_ERR(in)) {
1267 dout("new_inode badness\n");
1268 d_delete(dn);
1269 dput(dn);
1270 err = PTR_ERR(in);
1271 goto out;
1272 }
1273 dn = splice_dentry(dn, in, NULL, false);
1274 if (IS_ERR(dn))
1275 dn = NULL;
1276 }
1277
1278 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1279 req->r_request_started, -1,
1280 &req->r_caps_reservation) < 0) {
1281 pr_err("fill_inode badness on %p\n", in);
1282 goto next_item;
1283 }
1284 if (dn)
1285 update_dentry_lease(dn, rinfo->dir_dlease[i],
1286 req->r_session,
1287 req->r_request_started);
1288 next_item:
1289 if (dn)
1290 dput(dn);
1291 }
1292 req->r_did_prepopulate = true;
1293
1294 out:
1295 if (snapdir) {
1296 iput(snapdir);
1297 dput(parent);
1298 }
1299 dout("readdir_prepopulate done\n");
1300 return err;
1301 }
1302
1303 int ceph_inode_set_size(struct inode *inode, loff_t size)
1304 {
1305 struct ceph_inode_info *ci = ceph_inode(inode);
1306 int ret = 0;
1307
1308 spin_lock(&inode->i_lock);
1309 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1310 inode->i_size = size;
1311 inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1312
1313 /* tell the MDS if we are approaching max_size */
1314 if ((size << 1) >= ci->i_max_size &&
1315 (ci->i_reported_size << 1) < ci->i_max_size)
1316 ret = 1;
1317
1318 spin_unlock(&inode->i_lock);
1319 return ret;
1320 }
1321
1322 /*
1323 * Write back inode data in a worker thread. (This can't be done
1324 * in the message handler context.)
1325 */
1326 void ceph_queue_writeback(struct inode *inode)
1327 {
1328 if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1329 &ceph_inode(inode)->i_wb_work)) {
1330 dout("ceph_queue_writeback %p\n", inode);
1331 ihold(inode);
1332 } else {
1333 dout("ceph_queue_writeback %p failed\n", inode);
1334 }
1335 }
1336
1337 static void ceph_writeback_work(struct work_struct *work)
1338 {
1339 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1340 i_wb_work);
1341 struct inode *inode = &ci->vfs_inode;
1342
1343 dout("writeback %p\n", inode);
1344 filemap_fdatawrite(&inode->i_data);
1345 iput(inode);
1346 }
1347
1348 /*
1349 * queue an async invalidation
1350 */
1351 void ceph_queue_invalidate(struct inode *inode)
1352 {
1353 if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1354 &ceph_inode(inode)->i_pg_inv_work)) {
1355 dout("ceph_queue_invalidate %p\n", inode);
1356 ihold(inode);
1357 } else {
1358 dout("ceph_queue_invalidate %p failed\n", inode);
1359 }
1360 }
1361
1362 /*
1363 * invalidate any pages that are not dirty or under writeback. this
1364 * includes pages that are clean and mapped.
1365 */
1366 static void ceph_invalidate_nondirty_pages(struct address_space *mapping)
1367 {
1368 struct pagevec pvec;
1369 pgoff_t next = 0;
1370 int i;
1371
1372 pagevec_init(&pvec, 0);
1373 while (pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
1374 for (i = 0; i < pagevec_count(&pvec); i++) {
1375 struct page *page = pvec.pages[i];
1376 pgoff_t index;
1377 int skip_page =
1378 (PageDirty(page) || PageWriteback(page));
1379
1380 if (!skip_page)
1381 skip_page = !trylock_page(page);
1382
1383 /*
1384 * We really shouldn't be looking at the ->index of an
1385 * unlocked page. But we're not allowed to lock these
1386 * pages. So we rely upon nobody altering the ->index
1387 * of this (pinned-by-us) page.
1388 */
1389 index = page->index;
1390 if (index > next)
1391 next = index;
1392 next++;
1393
1394 if (skip_page)
1395 continue;
1396
1397 generic_error_remove_page(mapping, page);
1398 unlock_page(page);
1399 }
1400 pagevec_release(&pvec);
1401 cond_resched();
1402 }
1403 }
1404
1405 /*
1406 * Invalidate inode pages in a worker thread. (This can't be done
1407 * in the message handler context.)
1408 */
1409 static void ceph_invalidate_work(struct work_struct *work)
1410 {
1411 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1412 i_pg_inv_work);
1413 struct inode *inode = &ci->vfs_inode;
1414 u32 orig_gen;
1415 int check = 0;
1416
1417 spin_lock(&inode->i_lock);
1418 dout("invalidate_pages %p gen %d revoking %d\n", inode,
1419 ci->i_rdcache_gen, ci->i_rdcache_revoking);
1420 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1421 /* nevermind! */
1422 spin_unlock(&inode->i_lock);
1423 goto out;
1424 }
1425 orig_gen = ci->i_rdcache_gen;
1426 spin_unlock(&inode->i_lock);
1427
1428 ceph_invalidate_nondirty_pages(inode->i_mapping);
1429
1430 spin_lock(&inode->i_lock);
1431 if (orig_gen == ci->i_rdcache_gen &&
1432 orig_gen == ci->i_rdcache_revoking) {
1433 dout("invalidate_pages %p gen %d successful\n", inode,
1434 ci->i_rdcache_gen);
1435 ci->i_rdcache_revoking--;
1436 check = 1;
1437 } else {
1438 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1439 inode, orig_gen, ci->i_rdcache_gen,
1440 ci->i_rdcache_revoking);
1441 }
1442 spin_unlock(&inode->i_lock);
1443
1444 if (check)
1445 ceph_check_caps(ci, 0, NULL);
1446 out:
1447 iput(inode);
1448 }
1449
1450
1451 /*
1452 * called by trunc_wq; take i_mutex ourselves
1453 *
1454 * We also truncate in a separate thread as well.
1455 */
1456 static void ceph_vmtruncate_work(struct work_struct *work)
1457 {
1458 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1459 i_vmtruncate_work);
1460 struct inode *inode = &ci->vfs_inode;
1461
1462 dout("vmtruncate_work %p\n", inode);
1463 mutex_lock(&inode->i_mutex);
1464 __ceph_do_pending_vmtruncate(inode);
1465 mutex_unlock(&inode->i_mutex);
1466 iput(inode);
1467 }
1468
1469 /*
1470 * Queue an async vmtruncate. If we fail to queue work, we will handle
1471 * the truncation the next time we call __ceph_do_pending_vmtruncate.
1472 */
1473 void ceph_queue_vmtruncate(struct inode *inode)
1474 {
1475 struct ceph_inode_info *ci = ceph_inode(inode);
1476
1477 if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1478 &ci->i_vmtruncate_work)) {
1479 dout("ceph_queue_vmtruncate %p\n", inode);
1480 ihold(inode);
1481 } else {
1482 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1483 inode, ci->i_truncate_pending);
1484 }
1485 }
1486
1487 /*
1488 * called with i_mutex held.
1489 *
1490 * Make sure any pending truncation is applied before doing anything
1491 * that may depend on it.
1492 */
1493 void __ceph_do_pending_vmtruncate(struct inode *inode)
1494 {
1495 struct ceph_inode_info *ci = ceph_inode(inode);
1496 u64 to;
1497 int wrbuffer_refs, wake = 0;
1498
1499 retry:
1500 spin_lock(&inode->i_lock);
1501 if (ci->i_truncate_pending == 0) {
1502 dout("__do_pending_vmtruncate %p none pending\n", inode);
1503 spin_unlock(&inode->i_lock);
1504 return;
1505 }
1506
1507 /*
1508 * make sure any dirty snapped pages are flushed before we
1509 * possibly truncate them.. so write AND block!
1510 */
1511 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1512 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1513 inode);
1514 spin_unlock(&inode->i_lock);
1515 filemap_write_and_wait_range(&inode->i_data, 0,
1516 inode->i_sb->s_maxbytes);
1517 goto retry;
1518 }
1519
1520 to = ci->i_truncate_size;
1521 wrbuffer_refs = ci->i_wrbuffer_ref;
1522 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1523 ci->i_truncate_pending, to);
1524 spin_unlock(&inode->i_lock);
1525
1526 truncate_inode_pages(inode->i_mapping, to);
1527
1528 spin_lock(&inode->i_lock);
1529 ci->i_truncate_pending--;
1530 if (ci->i_truncate_pending == 0)
1531 wake = 1;
1532 spin_unlock(&inode->i_lock);
1533
1534 if (wrbuffer_refs == 0)
1535 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1536 if (wake)
1537 wake_up_all(&ci->i_cap_wq);
1538 }
1539
1540
1541 /*
1542 * symlinks
1543 */
1544 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1545 {
1546 struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1547 nd_set_link(nd, ci->i_symlink);
1548 return NULL;
1549 }
1550
1551 static const struct inode_operations ceph_symlink_iops = {
1552 .readlink = generic_readlink,
1553 .follow_link = ceph_sym_follow_link,
1554 };
1555
1556 /*
1557 * setattr
1558 */
1559 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1560 {
1561 struct inode *inode = dentry->d_inode;
1562 struct ceph_inode_info *ci = ceph_inode(inode);
1563 struct inode *parent_inode = dentry->d_parent->d_inode;
1564 const unsigned int ia_valid = attr->ia_valid;
1565 struct ceph_mds_request *req;
1566 struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1567 int issued;
1568 int release = 0, dirtied = 0;
1569 int mask = 0;
1570 int err = 0;
1571 int inode_dirty_flags = 0;
1572
1573 if (ceph_snap(inode) != CEPH_NOSNAP)
1574 return -EROFS;
1575
1576 __ceph_do_pending_vmtruncate(inode);
1577
1578 err = inode_change_ok(inode, attr);
1579 if (err != 0)
1580 return err;
1581
1582 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1583 USE_AUTH_MDS);
1584 if (IS_ERR(req))
1585 return PTR_ERR(req);
1586
1587 spin_lock(&inode->i_lock);
1588 issued = __ceph_caps_issued(ci, NULL);
1589 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1590
1591 if (ia_valid & ATTR_UID) {
1592 dout("setattr %p uid %d -> %d\n", inode,
1593 inode->i_uid, attr->ia_uid);
1594 if (issued & CEPH_CAP_AUTH_EXCL) {
1595 inode->i_uid = attr->ia_uid;
1596 dirtied |= CEPH_CAP_AUTH_EXCL;
1597 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1598 attr->ia_uid != inode->i_uid) {
1599 req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid);
1600 mask |= CEPH_SETATTR_UID;
1601 release |= CEPH_CAP_AUTH_SHARED;
1602 }
1603 }
1604 if (ia_valid & ATTR_GID) {
1605 dout("setattr %p gid %d -> %d\n", inode,
1606 inode->i_gid, attr->ia_gid);
1607 if (issued & CEPH_CAP_AUTH_EXCL) {
1608 inode->i_gid = attr->ia_gid;
1609 dirtied |= CEPH_CAP_AUTH_EXCL;
1610 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1611 attr->ia_gid != inode->i_gid) {
1612 req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid);
1613 mask |= CEPH_SETATTR_GID;
1614 release |= CEPH_CAP_AUTH_SHARED;
1615 }
1616 }
1617 if (ia_valid & ATTR_MODE) {
1618 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1619 attr->ia_mode);
1620 if (issued & CEPH_CAP_AUTH_EXCL) {
1621 inode->i_mode = attr->ia_mode;
1622 dirtied |= CEPH_CAP_AUTH_EXCL;
1623 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1624 attr->ia_mode != inode->i_mode) {
1625 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1626 mask |= CEPH_SETATTR_MODE;
1627 release |= CEPH_CAP_AUTH_SHARED;
1628 }
1629 }
1630
1631 if (ia_valid & ATTR_ATIME) {
1632 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1633 inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1634 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1635 if (issued & CEPH_CAP_FILE_EXCL) {
1636 ci->i_time_warp_seq++;
1637 inode->i_atime = attr->ia_atime;
1638 dirtied |= CEPH_CAP_FILE_EXCL;
1639 } else if ((issued & CEPH_CAP_FILE_WR) &&
1640 timespec_compare(&inode->i_atime,
1641 &attr->ia_atime) < 0) {
1642 inode->i_atime = attr->ia_atime;
1643 dirtied |= CEPH_CAP_FILE_WR;
1644 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1645 !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1646 ceph_encode_timespec(&req->r_args.setattr.atime,
1647 &attr->ia_atime);
1648 mask |= CEPH_SETATTR_ATIME;
1649 release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1650 CEPH_CAP_FILE_WR;
1651 }
1652 }
1653 if (ia_valid & ATTR_MTIME) {
1654 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1655 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1656 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1657 if (issued & CEPH_CAP_FILE_EXCL) {
1658 ci->i_time_warp_seq++;
1659 inode->i_mtime = attr->ia_mtime;
1660 dirtied |= CEPH_CAP_FILE_EXCL;
1661 } else if ((issued & CEPH_CAP_FILE_WR) &&
1662 timespec_compare(&inode->i_mtime,
1663 &attr->ia_mtime) < 0) {
1664 inode->i_mtime = attr->ia_mtime;
1665 dirtied |= CEPH_CAP_FILE_WR;
1666 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1667 !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1668 ceph_encode_timespec(&req->r_args.setattr.mtime,
1669 &attr->ia_mtime);
1670 mask |= CEPH_SETATTR_MTIME;
1671 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1672 CEPH_CAP_FILE_WR;
1673 }
1674 }
1675 if (ia_valid & ATTR_SIZE) {
1676 dout("setattr %p size %lld -> %lld\n", inode,
1677 inode->i_size, attr->ia_size);
1678 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1679 err = -EINVAL;
1680 goto out;
1681 }
1682 if ((issued & CEPH_CAP_FILE_EXCL) &&
1683 attr->ia_size > inode->i_size) {
1684 inode->i_size = attr->ia_size;
1685 inode->i_blocks =
1686 (attr->ia_size + (1 << 9) - 1) >> 9;
1687 inode->i_ctime = attr->ia_ctime;
1688 ci->i_reported_size = attr->ia_size;
1689 dirtied |= CEPH_CAP_FILE_EXCL;
1690 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1691 attr->ia_size != inode->i_size) {
1692 req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1693 req->r_args.setattr.old_size =
1694 cpu_to_le64(inode->i_size);
1695 mask |= CEPH_SETATTR_SIZE;
1696 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1697 CEPH_CAP_FILE_WR;
1698 }
1699 }
1700
1701 /* these do nothing */
1702 if (ia_valid & ATTR_CTIME) {
1703 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1704 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1705 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1706 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1707 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1708 only ? "ctime only" : "ignored");
1709 inode->i_ctime = attr->ia_ctime;
1710 if (only) {
1711 /*
1712 * if kernel wants to dirty ctime but nothing else,
1713 * we need to choose a cap to dirty under, or do
1714 * a almost-no-op setattr
1715 */
1716 if (issued & CEPH_CAP_AUTH_EXCL)
1717 dirtied |= CEPH_CAP_AUTH_EXCL;
1718 else if (issued & CEPH_CAP_FILE_EXCL)
1719 dirtied |= CEPH_CAP_FILE_EXCL;
1720 else if (issued & CEPH_CAP_XATTR_EXCL)
1721 dirtied |= CEPH_CAP_XATTR_EXCL;
1722 else
1723 mask |= CEPH_SETATTR_CTIME;
1724 }
1725 }
1726 if (ia_valid & ATTR_FILE)
1727 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1728
1729 if (dirtied) {
1730 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied);
1731 inode->i_ctime = CURRENT_TIME;
1732 }
1733
1734 release &= issued;
1735 spin_unlock(&inode->i_lock);
1736
1737 if (inode_dirty_flags)
1738 __mark_inode_dirty(inode, inode_dirty_flags);
1739
1740 if (mask) {
1741 req->r_inode = inode;
1742 ihold(inode);
1743 req->r_inode_drop = release;
1744 req->r_args.setattr.mask = cpu_to_le32(mask);
1745 req->r_num_caps = 1;
1746 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1747 }
1748 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1749 ceph_cap_string(dirtied), mask);
1750
1751 ceph_mdsc_put_request(req);
1752 __ceph_do_pending_vmtruncate(inode);
1753 return err;
1754 out:
1755 spin_unlock(&inode->i_lock);
1756 ceph_mdsc_put_request(req);
1757 return err;
1758 }
1759
1760 /*
1761 * Verify that we have a lease on the given mask. If not,
1762 * do a getattr against an mds.
1763 */
1764 int ceph_do_getattr(struct inode *inode, int mask)
1765 {
1766 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
1767 struct ceph_mds_client *mdsc = fsc->mdsc;
1768 struct ceph_mds_request *req;
1769 int err;
1770
1771 if (ceph_snap(inode) == CEPH_SNAPDIR) {
1772 dout("do_getattr inode %p SNAPDIR\n", inode);
1773 return 0;
1774 }
1775
1776 dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode);
1777 if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1778 return 0;
1779
1780 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1781 if (IS_ERR(req))
1782 return PTR_ERR(req);
1783 req->r_inode = inode;
1784 ihold(inode);
1785 req->r_num_caps = 1;
1786 req->r_args.getattr.mask = cpu_to_le32(mask);
1787 err = ceph_mdsc_do_request(mdsc, NULL, req);
1788 ceph_mdsc_put_request(req);
1789 dout("do_getattr result=%d\n", err);
1790 return err;
1791 }
1792
1793
1794 /*
1795 * Check inode permissions. We verify we have a valid value for
1796 * the AUTH cap, then call the generic handler.
1797 */
1798 int ceph_permission(struct inode *inode, int mask, unsigned int flags)
1799 {
1800 int err;
1801
1802 if (flags & IPERM_FLAG_RCU)
1803 return -ECHILD;
1804
1805 err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1806
1807 if (!err)
1808 err = generic_permission(inode, mask, flags, NULL);
1809 return err;
1810 }
1811
1812 /*
1813 * Get all attributes. Hopefully somedata we'll have a statlite()
1814 * and can limit the fields we require to be accurate.
1815 */
1816 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1817 struct kstat *stat)
1818 {
1819 struct inode *inode = dentry->d_inode;
1820 struct ceph_inode_info *ci = ceph_inode(inode);
1821 int err;
1822
1823 err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1824 if (!err) {
1825 generic_fillattr(inode, stat);
1826 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
1827 if (ceph_snap(inode) != CEPH_NOSNAP)
1828 stat->dev = ceph_snap(inode);
1829 else
1830 stat->dev = 0;
1831 if (S_ISDIR(inode->i_mode)) {
1832 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
1833 RBYTES))
1834 stat->size = ci->i_rbytes;
1835 else
1836 stat->size = ci->i_files + ci->i_subdirs;
1837 stat->blocks = 0;
1838 stat->blksize = 65536;
1839 }
1840 }
1841 return err;
1842 }