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1#include <linux/ceph/ceph_debug.h>
2
3#include <linux/module.h>
4#include <linux/fs.h>
5#include <linux/slab.h>
6#include <linux/string.h>
7#include <linux/uaccess.h>
8#include <linux/kernel.h>
9#include <linux/namei.h>
10#include <linux/writeback.h>
11#include <linux/vmalloc.h>
12#include <linux/posix_acl.h>
13
14#include "super.h"
15#include "mds_client.h"
16#include "cache.h"
17#include <linux/ceph/decode.h>
18
19/*
20 * Ceph inode operations
21 *
22 * Implement basic inode helpers (get, alloc) and inode ops (getattr,
23 * setattr, etc.), xattr helpers, and helpers for assimilating
24 * metadata returned by the MDS into our cache.
25 *
26 * Also define helpers for doing asynchronous writeback, invalidation,
27 * and truncation for the benefit of those who can't afford to block
28 * (typically because they are in the message handler path).
29 */
30
31static const struct inode_operations ceph_symlink_iops;
32
33static void ceph_invalidate_work(struct work_struct *work);
34static void ceph_writeback_work(struct work_struct *work);
35static void ceph_vmtruncate_work(struct work_struct *work);
36
37/*
38 * find or create an inode, given the ceph ino number
39 */
40static int ceph_set_ino_cb(struct inode *inode, void *data)
41{
42 ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
43 inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
44 return 0;
45}
46
47struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
48{
49 struct inode *inode;
50 ino_t t = ceph_vino_to_ino(vino);
51
52 inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
53 if (inode == NULL)
54 return ERR_PTR(-ENOMEM);
55 if (inode->i_state & I_NEW) {
56 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
57 inode, ceph_vinop(inode), (u64)inode->i_ino);
58 unlock_new_inode(inode);
59 }
60
61 dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
62 vino.snap, inode);
63 return inode;
64}
65
66/*
67 * get/constuct snapdir inode for a given directory
68 */
69struct inode *ceph_get_snapdir(struct inode *parent)
70{
71 struct ceph_vino vino = {
72 .ino = ceph_ino(parent),
73 .snap = CEPH_SNAPDIR,
74 };
75 struct inode *inode = ceph_get_inode(parent->i_sb, vino);
76 struct ceph_inode_info *ci = ceph_inode(inode);
77
78 BUG_ON(!S_ISDIR(parent->i_mode));
79 if (IS_ERR(inode))
80 return inode;
81 inode->i_mode = parent->i_mode;
82 inode->i_uid = parent->i_uid;
83 inode->i_gid = parent->i_gid;
84 inode->i_op = &ceph_dir_iops;
85 inode->i_fop = &ceph_dir_fops;
86 ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
87 ci->i_rbytes = 0;
88 return inode;
89}
90
91const struct inode_operations ceph_file_iops = {
92 .permission = ceph_permission,
93 .setattr = ceph_setattr,
94 .getattr = ceph_getattr,
95 .setxattr = ceph_setxattr,
96 .getxattr = ceph_getxattr,
97 .listxattr = ceph_listxattr,
98 .removexattr = ceph_removexattr,
99 .get_acl = ceph_get_acl,
100 .set_acl = ceph_set_acl,
101};
102
103
104/*
105 * We use a 'frag tree' to keep track of the MDS's directory fragments
106 * for a given inode (usually there is just a single fragment). We
107 * need to know when a child frag is delegated to a new MDS, or when
108 * it is flagged as replicated, so we can direct our requests
109 * accordingly.
110 */
111
112/*
113 * find/create a frag in the tree
114 */
115static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
116 u32 f)
117{
118 struct rb_node **p;
119 struct rb_node *parent = NULL;
120 struct ceph_inode_frag *frag;
121 int c;
122
123 p = &ci->i_fragtree.rb_node;
124 while (*p) {
125 parent = *p;
126 frag = rb_entry(parent, struct ceph_inode_frag, node);
127 c = ceph_frag_compare(f, frag->frag);
128 if (c < 0)
129 p = &(*p)->rb_left;
130 else if (c > 0)
131 p = &(*p)->rb_right;
132 else
133 return frag;
134 }
135
136 frag = kmalloc(sizeof(*frag), GFP_NOFS);
137 if (!frag) {
138 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
139 "frag %x\n", &ci->vfs_inode,
140 ceph_vinop(&ci->vfs_inode), f);
141 return ERR_PTR(-ENOMEM);
142 }
143 frag->frag = f;
144 frag->split_by = 0;
145 frag->mds = -1;
146 frag->ndist = 0;
147
148 rb_link_node(&frag->node, parent, p);
149 rb_insert_color(&frag->node, &ci->i_fragtree);
150
151 dout("get_or_create_frag added %llx.%llx frag %x\n",
152 ceph_vinop(&ci->vfs_inode), f);
153 return frag;
154}
155
156/*
157 * find a specific frag @f
158 */
159struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
160{
161 struct rb_node *n = ci->i_fragtree.rb_node;
162
163 while (n) {
164 struct ceph_inode_frag *frag =
165 rb_entry(n, struct ceph_inode_frag, node);
166 int c = ceph_frag_compare(f, frag->frag);
167 if (c < 0)
168 n = n->rb_left;
169 else if (c > 0)
170 n = n->rb_right;
171 else
172 return frag;
173 }
174 return NULL;
175}
176
177/*
178 * Choose frag containing the given value @v. If @pfrag is
179 * specified, copy the frag delegation info to the caller if
180 * it is present.
181 */
182u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
183 struct ceph_inode_frag *pfrag,
184 int *found)
185{
186 u32 t = ceph_frag_make(0, 0);
187 struct ceph_inode_frag *frag;
188 unsigned nway, i;
189 u32 n;
190
191 if (found)
192 *found = 0;
193
194 mutex_lock(&ci->i_fragtree_mutex);
195 while (1) {
196 WARN_ON(!ceph_frag_contains_value(t, v));
197 frag = __ceph_find_frag(ci, t);
198 if (!frag)
199 break; /* t is a leaf */
200 if (frag->split_by == 0) {
201 if (pfrag)
202 memcpy(pfrag, frag, sizeof(*pfrag));
203 if (found)
204 *found = 1;
205 break;
206 }
207
208 /* choose child */
209 nway = 1 << frag->split_by;
210 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
211 frag->split_by, nway);
212 for (i = 0; i < nway; i++) {
213 n = ceph_frag_make_child(t, frag->split_by, i);
214 if (ceph_frag_contains_value(n, v)) {
215 t = n;
216 break;
217 }
218 }
219 BUG_ON(i == nway);
220 }
221 dout("choose_frag(%x) = %x\n", v, t);
222
223 mutex_unlock(&ci->i_fragtree_mutex);
224 return t;
225}
226
227/*
228 * Process dirfrag (delegation) info from the mds. Include leaf
229 * fragment in tree ONLY if ndist > 0. Otherwise, only
230 * branches/splits are included in i_fragtree)
231 */
232static int ceph_fill_dirfrag(struct inode *inode,
233 struct ceph_mds_reply_dirfrag *dirinfo)
234{
235 struct ceph_inode_info *ci = ceph_inode(inode);
236 struct ceph_inode_frag *frag;
237 u32 id = le32_to_cpu(dirinfo->frag);
238 int mds = le32_to_cpu(dirinfo->auth);
239 int ndist = le32_to_cpu(dirinfo->ndist);
240 int i;
241 int err = 0;
242
243 mutex_lock(&ci->i_fragtree_mutex);
244 if (ndist == 0) {
245 /* no delegation info needed. */
246 frag = __ceph_find_frag(ci, id);
247 if (!frag)
248 goto out;
249 if (frag->split_by == 0) {
250 /* tree leaf, remove */
251 dout("fill_dirfrag removed %llx.%llx frag %x"
252 " (no ref)\n", ceph_vinop(inode), id);
253 rb_erase(&frag->node, &ci->i_fragtree);
254 kfree(frag);
255 } else {
256 /* tree branch, keep and clear */
257 dout("fill_dirfrag cleared %llx.%llx frag %x"
258 " referral\n", ceph_vinop(inode), id);
259 frag->mds = -1;
260 frag->ndist = 0;
261 }
262 goto out;
263 }
264
265
266 /* find/add this frag to store mds delegation info */
267 frag = __get_or_create_frag(ci, id);
268 if (IS_ERR(frag)) {
269 /* this is not the end of the world; we can continue
270 with bad/inaccurate delegation info */
271 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
272 ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
273 err = -ENOMEM;
274 goto out;
275 }
276
277 frag->mds = mds;
278 frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
279 for (i = 0; i < frag->ndist; i++)
280 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
281 dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
282 ceph_vinop(inode), frag->frag, frag->ndist);
283
284out:
285 mutex_unlock(&ci->i_fragtree_mutex);
286 return err;
287}
288
289
290/*
291 * initialize a newly allocated inode.
292 */
293struct inode *ceph_alloc_inode(struct super_block *sb)
294{
295 struct ceph_inode_info *ci;
296 int i;
297
298 ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
299 if (!ci)
300 return NULL;
301
302 dout("alloc_inode %p\n", &ci->vfs_inode);
303
304 spin_lock_init(&ci->i_ceph_lock);
305
306 ci->i_version = 0;
307 ci->i_time_warp_seq = 0;
308 ci->i_ceph_flags = 0;
309 atomic_set(&ci->i_release_count, 1);
310 atomic_set(&ci->i_complete_count, 0);
311 ci->i_symlink = NULL;
312
313 memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
314
315 ci->i_fragtree = RB_ROOT;
316 mutex_init(&ci->i_fragtree_mutex);
317
318 ci->i_xattrs.blob = NULL;
319 ci->i_xattrs.prealloc_blob = NULL;
320 ci->i_xattrs.dirty = false;
321 ci->i_xattrs.index = RB_ROOT;
322 ci->i_xattrs.count = 0;
323 ci->i_xattrs.names_size = 0;
324 ci->i_xattrs.vals_size = 0;
325 ci->i_xattrs.version = 0;
326 ci->i_xattrs.index_version = 0;
327
328 ci->i_caps = RB_ROOT;
329 ci->i_auth_cap = NULL;
330 ci->i_dirty_caps = 0;
331 ci->i_flushing_caps = 0;
332 INIT_LIST_HEAD(&ci->i_dirty_item);
333 INIT_LIST_HEAD(&ci->i_flushing_item);
334 ci->i_cap_flush_seq = 0;
335 ci->i_cap_flush_last_tid = 0;
336 memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
337 init_waitqueue_head(&ci->i_cap_wq);
338 ci->i_hold_caps_min = 0;
339 ci->i_hold_caps_max = 0;
340 INIT_LIST_HEAD(&ci->i_cap_delay_list);
341 INIT_LIST_HEAD(&ci->i_cap_snaps);
342 ci->i_head_snapc = NULL;
343 ci->i_snap_caps = 0;
344 ci->i_cap_exporting_issued = 0;
345
346 for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
347 ci->i_nr_by_mode[i] = 0;
348
349 mutex_init(&ci->i_truncate_mutex);
350 ci->i_truncate_seq = 0;
351 ci->i_truncate_size = 0;
352 ci->i_truncate_pending = 0;
353
354 ci->i_max_size = 0;
355 ci->i_reported_size = 0;
356 ci->i_wanted_max_size = 0;
357 ci->i_requested_max_size = 0;
358
359 ci->i_pin_ref = 0;
360 ci->i_rd_ref = 0;
361 ci->i_rdcache_ref = 0;
362 ci->i_wr_ref = 0;
363 ci->i_wb_ref = 0;
364 ci->i_wrbuffer_ref = 0;
365 ci->i_wrbuffer_ref_head = 0;
366 ci->i_shared_gen = 0;
367 ci->i_rdcache_gen = 0;
368 ci->i_rdcache_revoking = 0;
369
370 INIT_LIST_HEAD(&ci->i_unsafe_writes);
371 INIT_LIST_HEAD(&ci->i_unsafe_dirops);
372 spin_lock_init(&ci->i_unsafe_lock);
373
374 ci->i_snap_realm = NULL;
375 INIT_LIST_HEAD(&ci->i_snap_realm_item);
376 INIT_LIST_HEAD(&ci->i_snap_flush_item);
377
378 INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
379 INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
380
381 INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
382
383 ceph_fscache_inode_init(ci);
384
385 return &ci->vfs_inode;
386}
387
388static void ceph_i_callback(struct rcu_head *head)
389{
390 struct inode *inode = container_of(head, struct inode, i_rcu);
391 struct ceph_inode_info *ci = ceph_inode(inode);
392
393 kmem_cache_free(ceph_inode_cachep, ci);
394}
395
396void ceph_destroy_inode(struct inode *inode)
397{
398 struct ceph_inode_info *ci = ceph_inode(inode);
399 struct ceph_inode_frag *frag;
400 struct rb_node *n;
401
402 dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
403
404 ceph_fscache_unregister_inode_cookie(ci);
405
406 ceph_queue_caps_release(inode);
407
408 /*
409 * we may still have a snap_realm reference if there are stray
410 * caps in i_cap_exporting_issued or i_snap_caps.
411 */
412 if (ci->i_snap_realm) {
413 struct ceph_mds_client *mdsc =
414 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
415 struct ceph_snap_realm *realm = ci->i_snap_realm;
416
417 dout(" dropping residual ref to snap realm %p\n", realm);
418 spin_lock(&realm->inodes_with_caps_lock);
419 list_del_init(&ci->i_snap_realm_item);
420 spin_unlock(&realm->inodes_with_caps_lock);
421 ceph_put_snap_realm(mdsc, realm);
422 }
423
424 kfree(ci->i_symlink);
425 while ((n = rb_first(&ci->i_fragtree)) != NULL) {
426 frag = rb_entry(n, struct ceph_inode_frag, node);
427 rb_erase(n, &ci->i_fragtree);
428 kfree(frag);
429 }
430
431 __ceph_destroy_xattrs(ci);
432 if (ci->i_xattrs.blob)
433 ceph_buffer_put(ci->i_xattrs.blob);
434 if (ci->i_xattrs.prealloc_blob)
435 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
436
437 call_rcu(&inode->i_rcu, ceph_i_callback);
438}
439
440int ceph_drop_inode(struct inode *inode)
441{
442 /*
443 * Positve dentry and corresponding inode are always accompanied
444 * in MDS reply. So no need to keep inode in the cache after
445 * dropping all its aliases.
446 */
447 return 1;
448}
449
450/*
451 * Helpers to fill in size, ctime, mtime, and atime. We have to be
452 * careful because either the client or MDS may have more up to date
453 * info, depending on which capabilities are held, and whether
454 * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime
455 * and size are monotonically increasing, except when utimes() or
456 * truncate() increments the corresponding _seq values.)
457 */
458int ceph_fill_file_size(struct inode *inode, int issued,
459 u32 truncate_seq, u64 truncate_size, u64 size)
460{
461 struct ceph_inode_info *ci = ceph_inode(inode);
462 int queue_trunc = 0;
463
464 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
465 (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
466 dout("size %lld -> %llu\n", inode->i_size, size);
467 inode->i_size = size;
468 inode->i_blocks = (size + (1<<9) - 1) >> 9;
469 ci->i_reported_size = size;
470 if (truncate_seq != ci->i_truncate_seq) {
471 dout("truncate_seq %u -> %u\n",
472 ci->i_truncate_seq, truncate_seq);
473 ci->i_truncate_seq = truncate_seq;
474
475 /* the MDS should have revoked these caps */
476 WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
477 CEPH_CAP_FILE_RD |
478 CEPH_CAP_FILE_WR |
479 CEPH_CAP_FILE_LAZYIO));
480 /*
481 * If we hold relevant caps, or in the case where we're
482 * not the only client referencing this file and we
483 * don't hold those caps, then we need to check whether
484 * the file is either opened or mmaped
485 */
486 if ((issued & (CEPH_CAP_FILE_CACHE|
487 CEPH_CAP_FILE_BUFFER)) ||
488 mapping_mapped(inode->i_mapping) ||
489 __ceph_caps_file_wanted(ci)) {
490 ci->i_truncate_pending++;
491 queue_trunc = 1;
492 }
493 }
494 }
495 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
496 ci->i_truncate_size != truncate_size) {
497 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
498 truncate_size);
499 ci->i_truncate_size = truncate_size;
500 }
501
502 if (queue_trunc)
503 ceph_fscache_invalidate(inode);
504
505 return queue_trunc;
506}
507
508void ceph_fill_file_time(struct inode *inode, int issued,
509 u64 time_warp_seq, struct timespec *ctime,
510 struct timespec *mtime, struct timespec *atime)
511{
512 struct ceph_inode_info *ci = ceph_inode(inode);
513 int warn = 0;
514
515 if (issued & (CEPH_CAP_FILE_EXCL|
516 CEPH_CAP_FILE_WR|
517 CEPH_CAP_FILE_BUFFER|
518 CEPH_CAP_AUTH_EXCL|
519 CEPH_CAP_XATTR_EXCL)) {
520 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
521 dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
522 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
523 ctime->tv_sec, ctime->tv_nsec);
524 inode->i_ctime = *ctime;
525 }
526 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
527 /* the MDS did a utimes() */
528 dout("mtime %ld.%09ld -> %ld.%09ld "
529 "tw %d -> %d\n",
530 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
531 mtime->tv_sec, mtime->tv_nsec,
532 ci->i_time_warp_seq, (int)time_warp_seq);
533
534 inode->i_mtime = *mtime;
535 inode->i_atime = *atime;
536 ci->i_time_warp_seq = time_warp_seq;
537 } else if (time_warp_seq == ci->i_time_warp_seq) {
538 /* nobody did utimes(); take the max */
539 if (timespec_compare(mtime, &inode->i_mtime) > 0) {
540 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
541 inode->i_mtime.tv_sec,
542 inode->i_mtime.tv_nsec,
543 mtime->tv_sec, mtime->tv_nsec);
544 inode->i_mtime = *mtime;
545 }
546 if (timespec_compare(atime, &inode->i_atime) > 0) {
547 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
548 inode->i_atime.tv_sec,
549 inode->i_atime.tv_nsec,
550 atime->tv_sec, atime->tv_nsec);
551 inode->i_atime = *atime;
552 }
553 } else if (issued & CEPH_CAP_FILE_EXCL) {
554 /* we did a utimes(); ignore mds values */
555 } else {
556 warn = 1;
557 }
558 } else {
559 /* we have no write|excl caps; whatever the MDS says is true */
560 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
561 inode->i_ctime = *ctime;
562 inode->i_mtime = *mtime;
563 inode->i_atime = *atime;
564 ci->i_time_warp_seq = time_warp_seq;
565 } else {
566 warn = 1;
567 }
568 }
569 if (warn) /* time_warp_seq shouldn't go backwards */
570 dout("%p mds time_warp_seq %llu < %u\n",
571 inode, time_warp_seq, ci->i_time_warp_seq);
572}
573
574/*
575 * Populate an inode based on info from mds. May be called on new or
576 * existing inodes.
577 */
578static int fill_inode(struct inode *inode,
579 struct ceph_mds_reply_info_in *iinfo,
580 struct ceph_mds_reply_dirfrag *dirinfo,
581 struct ceph_mds_session *session,
582 unsigned long ttl_from, int cap_fmode,
583 struct ceph_cap_reservation *caps_reservation)
584{
585 struct ceph_mds_reply_inode *info = iinfo->in;
586 struct ceph_inode_info *ci = ceph_inode(inode);
587 int i;
588 int issued = 0, implemented;
589 struct timespec mtime, atime, ctime;
590 u32 nsplits;
591 struct ceph_inode_frag *frag;
592 struct rb_node *rb_node;
593 struct ceph_buffer *xattr_blob = NULL;
594 int err = 0;
595 int queue_trunc = 0;
596
597 dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
598 inode, ceph_vinop(inode), le64_to_cpu(info->version),
599 ci->i_version);
600
601 /*
602 * prealloc xattr data, if it looks like we'll need it. only
603 * if len > 4 (meaning there are actually xattrs; the first 4
604 * bytes are the xattr count).
605 */
606 if (iinfo->xattr_len > 4) {
607 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
608 if (!xattr_blob)
609 pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
610 iinfo->xattr_len);
611 }
612
613 spin_lock(&ci->i_ceph_lock);
614
615 /*
616 * provided version will be odd if inode value is projected,
617 * even if stable. skip the update if we have newer stable
618 * info (ours>=theirs, e.g. due to racing mds replies), unless
619 * we are getting projected (unstable) info (in which case the
620 * version is odd, and we want ours>theirs).
621 * us them
622 * 2 2 skip
623 * 3 2 skip
624 * 3 3 update
625 */
626 if (le64_to_cpu(info->version) > 0 &&
627 (ci->i_version & ~1) >= le64_to_cpu(info->version))
628 goto no_change;
629
630 issued = __ceph_caps_issued(ci, &implemented);
631 issued |= implemented | __ceph_caps_dirty(ci);
632
633 /* update inode */
634 ci->i_version = le64_to_cpu(info->version);
635 inode->i_version++;
636 inode->i_rdev = le32_to_cpu(info->rdev);
637
638 if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
639 inode->i_mode = le32_to_cpu(info->mode);
640 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
641 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
642 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
643 from_kuid(&init_user_ns, inode->i_uid),
644 from_kgid(&init_user_ns, inode->i_gid));
645 }
646
647 if ((issued & CEPH_CAP_LINK_EXCL) == 0)
648 set_nlink(inode, le32_to_cpu(info->nlink));
649
650 /* be careful with mtime, atime, size */
651 ceph_decode_timespec(&atime, &info->atime);
652 ceph_decode_timespec(&mtime, &info->mtime);
653 ceph_decode_timespec(&ctime, &info->ctime);
654 queue_trunc = ceph_fill_file_size(inode, issued,
655 le32_to_cpu(info->truncate_seq),
656 le64_to_cpu(info->truncate_size),
657 le64_to_cpu(info->size));
658 ceph_fill_file_time(inode, issued,
659 le32_to_cpu(info->time_warp_seq),
660 &ctime, &mtime, &atime);
661
662 ci->i_layout = info->layout;
663 inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
664
665 /* xattrs */
666 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
667 if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
668 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
669 if (ci->i_xattrs.blob)
670 ceph_buffer_put(ci->i_xattrs.blob);
671 ci->i_xattrs.blob = xattr_blob;
672 if (xattr_blob)
673 memcpy(ci->i_xattrs.blob->vec.iov_base,
674 iinfo->xattr_data, iinfo->xattr_len);
675 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
676 ceph_forget_all_cached_acls(inode);
677 xattr_blob = NULL;
678 }
679
680 inode->i_mapping->a_ops = &ceph_aops;
681 inode->i_mapping->backing_dev_info =
682 &ceph_sb_to_client(inode->i_sb)->backing_dev_info;
683
684 switch (inode->i_mode & S_IFMT) {
685 case S_IFIFO:
686 case S_IFBLK:
687 case S_IFCHR:
688 case S_IFSOCK:
689 init_special_inode(inode, inode->i_mode, inode->i_rdev);
690 inode->i_op = &ceph_file_iops;
691 break;
692 case S_IFREG:
693 inode->i_op = &ceph_file_iops;
694 inode->i_fop = &ceph_file_fops;
695 break;
696 case S_IFLNK:
697 inode->i_op = &ceph_symlink_iops;
698 if (!ci->i_symlink) {
699 u32 symlen = iinfo->symlink_len;
700 char *sym;
701
702 spin_unlock(&ci->i_ceph_lock);
703
704 err = -EINVAL;
705 if (WARN_ON(symlen != inode->i_size))
706 goto out;
707
708 err = -ENOMEM;
709 sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
710 if (!sym)
711 goto out;
712
713 spin_lock(&ci->i_ceph_lock);
714 if (!ci->i_symlink)
715 ci->i_symlink = sym;
716 else
717 kfree(sym); /* lost a race */
718 }
719 break;
720 case S_IFDIR:
721 inode->i_op = &ceph_dir_iops;
722 inode->i_fop = &ceph_dir_fops;
723
724 ci->i_dir_layout = iinfo->dir_layout;
725
726 ci->i_files = le64_to_cpu(info->files);
727 ci->i_subdirs = le64_to_cpu(info->subdirs);
728 ci->i_rbytes = le64_to_cpu(info->rbytes);
729 ci->i_rfiles = le64_to_cpu(info->rfiles);
730 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
731 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
732 break;
733 default:
734 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
735 ceph_vinop(inode), inode->i_mode);
736 }
737
738 /* set dir completion flag? */
739 if (S_ISDIR(inode->i_mode) &&
740 ci->i_files == 0 && ci->i_subdirs == 0 &&
741 ceph_snap(inode) == CEPH_NOSNAP &&
742 (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
743 (issued & CEPH_CAP_FILE_EXCL) == 0 &&
744 !__ceph_dir_is_complete(ci)) {
745 dout(" marking %p complete (empty)\n", inode);
746 __ceph_dir_set_complete(ci, atomic_read(&ci->i_release_count));
747 }
748no_change:
749 /* only update max_size on auth cap */
750 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
751 ci->i_max_size != le64_to_cpu(info->max_size)) {
752 dout("max_size %lld -> %llu\n", ci->i_max_size,
753 le64_to_cpu(info->max_size));
754 ci->i_max_size = le64_to_cpu(info->max_size);
755 }
756
757 spin_unlock(&ci->i_ceph_lock);
758
759 /* queue truncate if we saw i_size decrease */
760 if (queue_trunc)
761 ceph_queue_vmtruncate(inode);
762
763 /* populate frag tree */
764 /* FIXME: move me up, if/when version reflects fragtree changes */
765 nsplits = le32_to_cpu(info->fragtree.nsplits);
766 mutex_lock(&ci->i_fragtree_mutex);
767 rb_node = rb_first(&ci->i_fragtree);
768 for (i = 0; i < nsplits; i++) {
769 u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
770 frag = NULL;
771 while (rb_node) {
772 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
773 if (ceph_frag_compare(frag->frag, id) >= 0) {
774 if (frag->frag != id)
775 frag = NULL;
776 else
777 rb_node = rb_next(rb_node);
778 break;
779 }
780 rb_node = rb_next(rb_node);
781 rb_erase(&frag->node, &ci->i_fragtree);
782 kfree(frag);
783 frag = NULL;
784 }
785 if (!frag) {
786 frag = __get_or_create_frag(ci, id);
787 if (IS_ERR(frag))
788 continue;
789 }
790 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
791 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
792 }
793 while (rb_node) {
794 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
795 rb_node = rb_next(rb_node);
796 rb_erase(&frag->node, &ci->i_fragtree);
797 kfree(frag);
798 }
799 mutex_unlock(&ci->i_fragtree_mutex);
800
801 /* were we issued a capability? */
802 if (info->cap.caps) {
803 if (ceph_snap(inode) == CEPH_NOSNAP) {
804 ceph_add_cap(inode, session,
805 le64_to_cpu(info->cap.cap_id),
806 cap_fmode,
807 le32_to_cpu(info->cap.caps),
808 le32_to_cpu(info->cap.wanted),
809 le32_to_cpu(info->cap.seq),
810 le32_to_cpu(info->cap.mseq),
811 le64_to_cpu(info->cap.realm),
812 info->cap.flags,
813 caps_reservation);
814 } else {
815 spin_lock(&ci->i_ceph_lock);
816 dout(" %p got snap_caps %s\n", inode,
817 ceph_cap_string(le32_to_cpu(info->cap.caps)));
818 ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
819 if (cap_fmode >= 0)
820 __ceph_get_fmode(ci, cap_fmode);
821 spin_unlock(&ci->i_ceph_lock);
822 }
823 } else if (cap_fmode >= 0) {
824 pr_warning("mds issued no caps on %llx.%llx\n",
825 ceph_vinop(inode));
826 __ceph_get_fmode(ci, cap_fmode);
827 }
828
829 /* update delegation info? */
830 if (dirinfo)
831 ceph_fill_dirfrag(inode, dirinfo);
832
833 err = 0;
834
835out:
836 if (xattr_blob)
837 ceph_buffer_put(xattr_blob);
838 return err;
839}
840
841/*
842 * caller should hold session s_mutex.
843 */
844static void update_dentry_lease(struct dentry *dentry,
845 struct ceph_mds_reply_lease *lease,
846 struct ceph_mds_session *session,
847 unsigned long from_time)
848{
849 struct ceph_dentry_info *di = ceph_dentry(dentry);
850 long unsigned duration = le32_to_cpu(lease->duration_ms);
851 long unsigned ttl = from_time + (duration * HZ) / 1000;
852 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
853 struct inode *dir;
854
855 /* only track leases on regular dentries */
856 if (dentry->d_op != &ceph_dentry_ops)
857 return;
858
859 spin_lock(&dentry->d_lock);
860 dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
861 dentry, duration, ttl);
862
863 /* make lease_rdcache_gen match directory */
864 dir = dentry->d_parent->d_inode;
865 di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
866
867 if (duration == 0)
868 goto out_unlock;
869
870 if (di->lease_gen == session->s_cap_gen &&
871 time_before(ttl, dentry->d_time))
872 goto out_unlock; /* we already have a newer lease. */
873
874 if (di->lease_session && di->lease_session != session)
875 goto out_unlock;
876
877 ceph_dentry_lru_touch(dentry);
878
879 if (!di->lease_session)
880 di->lease_session = ceph_get_mds_session(session);
881 di->lease_gen = session->s_cap_gen;
882 di->lease_seq = le32_to_cpu(lease->seq);
883 di->lease_renew_after = half_ttl;
884 di->lease_renew_from = 0;
885 dentry->d_time = ttl;
886out_unlock:
887 spin_unlock(&dentry->d_lock);
888 return;
889}
890
891/*
892 * splice a dentry to an inode.
893 * caller must hold directory i_mutex for this to be safe.
894 *
895 * we will only rehash the resulting dentry if @prehash is
896 * true; @prehash will be set to false (for the benefit of
897 * the caller) if we fail.
898 */
899static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
900 bool *prehash)
901{
902 struct dentry *realdn;
903
904 BUG_ON(dn->d_inode);
905
906 /* dn must be unhashed */
907 if (!d_unhashed(dn))
908 d_drop(dn);
909 realdn = d_materialise_unique(dn, in);
910 if (IS_ERR(realdn)) {
911 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
912 PTR_ERR(realdn), dn, in, ceph_vinop(in));
913 if (prehash)
914 *prehash = false; /* don't rehash on error */
915 dn = realdn; /* note realdn contains the error */
916 goto out;
917 } else if (realdn) {
918 dout("dn %p (%d) spliced with %p (%d) "
919 "inode %p ino %llx.%llx\n",
920 dn, d_count(dn),
921 realdn, d_count(realdn),
922 realdn->d_inode, ceph_vinop(realdn->d_inode));
923 dput(dn);
924 dn = realdn;
925 } else {
926 BUG_ON(!ceph_dentry(dn));
927 dout("dn %p attached to %p ino %llx.%llx\n",
928 dn, dn->d_inode, ceph_vinop(dn->d_inode));
929 }
930 if ((!prehash || *prehash) && d_unhashed(dn))
931 d_rehash(dn);
932out:
933 return dn;
934}
935
936/*
937 * Incorporate results into the local cache. This is either just
938 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
939 * after a lookup).
940 *
941 * A reply may contain
942 * a directory inode along with a dentry.
943 * and/or a target inode
944 *
945 * Called with snap_rwsem (read).
946 */
947int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
948 struct ceph_mds_session *session)
949{
950 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
951 struct inode *in = NULL;
952 struct ceph_vino vino;
953 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
954 int err = 0;
955
956 dout("fill_trace %p is_dentry %d is_target %d\n", req,
957 rinfo->head->is_dentry, rinfo->head->is_target);
958
959#if 0
960 /*
961 * Debugging hook:
962 *
963 * If we resend completed ops to a recovering mds, we get no
964 * trace. Since that is very rare, pretend this is the case
965 * to ensure the 'no trace' handlers in the callers behave.
966 *
967 * Fill in inodes unconditionally to avoid breaking cap
968 * invariants.
969 */
970 if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
971 pr_info("fill_trace faking empty trace on %lld %s\n",
972 req->r_tid, ceph_mds_op_name(rinfo->head->op));
973 if (rinfo->head->is_dentry) {
974 rinfo->head->is_dentry = 0;
975 err = fill_inode(req->r_locked_dir,
976 &rinfo->diri, rinfo->dirfrag,
977 session, req->r_request_started, -1);
978 }
979 if (rinfo->head->is_target) {
980 rinfo->head->is_target = 0;
981 ininfo = rinfo->targeti.in;
982 vino.ino = le64_to_cpu(ininfo->ino);
983 vino.snap = le64_to_cpu(ininfo->snapid);
984 in = ceph_get_inode(sb, vino);
985 err = fill_inode(in, &rinfo->targeti, NULL,
986 session, req->r_request_started,
987 req->r_fmode);
988 iput(in);
989 }
990 }
991#endif
992
993 if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
994 dout("fill_trace reply is empty!\n");
995 if (rinfo->head->result == 0 && req->r_locked_dir)
996 ceph_invalidate_dir_request(req);
997 return 0;
998 }
999
1000 if (rinfo->head->is_dentry) {
1001 struct inode *dir = req->r_locked_dir;
1002
1003 if (dir) {
1004 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
1005 session, req->r_request_started, -1,
1006 &req->r_caps_reservation);
1007 if (err < 0)
1008 goto done;
1009 } else {
1010 WARN_ON_ONCE(1);
1011 }
1012
1013 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME) {
1014 struct qstr dname;
1015 struct dentry *dn, *parent;
1016
1017 BUG_ON(!rinfo->head->is_target);
1018 BUG_ON(req->r_dentry);
1019
1020 parent = d_find_any_alias(dir);
1021 BUG_ON(!parent);
1022
1023 dname.name = rinfo->dname;
1024 dname.len = rinfo->dname_len;
1025 dname.hash = full_name_hash(dname.name, dname.len);
1026 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1027 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1028retry_lookup:
1029 dn = d_lookup(parent, &dname);
1030 dout("d_lookup on parent=%p name=%.*s got %p\n",
1031 parent, dname.len, dname.name, dn);
1032
1033 if (!dn) {
1034 dn = d_alloc(parent, &dname);
1035 dout("d_alloc %p '%.*s' = %p\n", parent,
1036 dname.len, dname.name, dn);
1037 if (dn == NULL) {
1038 dput(parent);
1039 err = -ENOMEM;
1040 goto done;
1041 }
1042 err = ceph_init_dentry(dn);
1043 if (err < 0) {
1044 dput(dn);
1045 dput(parent);
1046 goto done;
1047 }
1048 } else if (dn->d_inode &&
1049 (ceph_ino(dn->d_inode) != vino.ino ||
1050 ceph_snap(dn->d_inode) != vino.snap)) {
1051 dout(" dn %p points to wrong inode %p\n",
1052 dn, dn->d_inode);
1053 d_delete(dn);
1054 dput(dn);
1055 goto retry_lookup;
1056 }
1057
1058 req->r_dentry = dn;
1059 dput(parent);
1060 }
1061 }
1062
1063 if (rinfo->head->is_target) {
1064 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1065 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1066
1067 in = ceph_get_inode(sb, vino);
1068 if (IS_ERR(in)) {
1069 err = PTR_ERR(in);
1070 goto done;
1071 }
1072 req->r_target_inode = in;
1073
1074 err = fill_inode(in, &rinfo->targeti, NULL,
1075 session, req->r_request_started,
1076 (!req->r_aborted && rinfo->head->result == 0) ?
1077 req->r_fmode : -1,
1078 &req->r_caps_reservation);
1079 if (err < 0) {
1080 pr_err("fill_inode badness %p %llx.%llx\n",
1081 in, ceph_vinop(in));
1082 goto done;
1083 }
1084 }
1085
1086 /*
1087 * ignore null lease/binding on snapdir ENOENT, or else we
1088 * will have trouble splicing in the virtual snapdir later
1089 */
1090 if (rinfo->head->is_dentry && !req->r_aborted &&
1091 req->r_locked_dir &&
1092 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1093 fsc->mount_options->snapdir_name,
1094 req->r_dentry->d_name.len))) {
1095 /*
1096 * lookup link rename : null -> possibly existing inode
1097 * mknod symlink mkdir : null -> new inode
1098 * unlink : linked -> null
1099 */
1100 struct inode *dir = req->r_locked_dir;
1101 struct dentry *dn = req->r_dentry;
1102 bool have_dir_cap, have_lease;
1103
1104 BUG_ON(!dn);
1105 BUG_ON(!dir);
1106 BUG_ON(dn->d_parent->d_inode != dir);
1107 BUG_ON(ceph_ino(dir) !=
1108 le64_to_cpu(rinfo->diri.in->ino));
1109 BUG_ON(ceph_snap(dir) !=
1110 le64_to_cpu(rinfo->diri.in->snapid));
1111
1112 /* do we have a lease on the whole dir? */
1113 have_dir_cap =
1114 (le32_to_cpu(rinfo->diri.in->cap.caps) &
1115 CEPH_CAP_FILE_SHARED);
1116
1117 /* do we have a dn lease? */
1118 have_lease = have_dir_cap ||
1119 le32_to_cpu(rinfo->dlease->duration_ms);
1120 if (!have_lease)
1121 dout("fill_trace no dentry lease or dir cap\n");
1122
1123 /* rename? */
1124 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1125 struct inode *olddir = req->r_old_dentry_dir;
1126 BUG_ON(!olddir);
1127
1128 dout(" src %p '%.*s' dst %p '%.*s'\n",
1129 req->r_old_dentry,
1130 req->r_old_dentry->d_name.len,
1131 req->r_old_dentry->d_name.name,
1132 dn, dn->d_name.len, dn->d_name.name);
1133 dout("fill_trace doing d_move %p -> %p\n",
1134 req->r_old_dentry, dn);
1135
1136 d_move(req->r_old_dentry, dn);
1137 dout(" src %p '%.*s' dst %p '%.*s'\n",
1138 req->r_old_dentry,
1139 req->r_old_dentry->d_name.len,
1140 req->r_old_dentry->d_name.name,
1141 dn, dn->d_name.len, dn->d_name.name);
1142
1143 /* ensure target dentry is invalidated, despite
1144 rehashing bug in vfs_rename_dir */
1145 ceph_invalidate_dentry_lease(dn);
1146
1147 /* d_move screws up sibling dentries' offsets */
1148 ceph_dir_clear_complete(dir);
1149 ceph_dir_clear_complete(olddir);
1150
1151 dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1152 ceph_dentry(req->r_old_dentry)->offset);
1153
1154 dn = req->r_old_dentry; /* use old_dentry */
1155 }
1156
1157 /* null dentry? */
1158 if (!rinfo->head->is_target) {
1159 dout("fill_trace null dentry\n");
1160 if (dn->d_inode) {
1161 dout("d_delete %p\n", dn);
1162 d_delete(dn);
1163 } else {
1164 dout("d_instantiate %p NULL\n", dn);
1165 d_instantiate(dn, NULL);
1166 if (have_lease && d_unhashed(dn))
1167 d_rehash(dn);
1168 update_dentry_lease(dn, rinfo->dlease,
1169 session,
1170 req->r_request_started);
1171 }
1172 goto done;
1173 }
1174
1175 /* attach proper inode */
1176 if (!dn->d_inode) {
1177 ceph_dir_clear_complete(dir);
1178 ihold(in);
1179 dn = splice_dentry(dn, in, &have_lease);
1180 if (IS_ERR(dn)) {
1181 err = PTR_ERR(dn);
1182 goto done;
1183 }
1184 req->r_dentry = dn; /* may have spliced */
1185 } else if (dn->d_inode && dn->d_inode != in) {
1186 dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1187 dn, dn->d_inode, ceph_vinop(dn->d_inode),
1188 ceph_vinop(in));
1189 have_lease = false;
1190 }
1191
1192 if (have_lease)
1193 update_dentry_lease(dn, rinfo->dlease, session,
1194 req->r_request_started);
1195 dout(" final dn %p\n", dn);
1196 } else if (!req->r_aborted &&
1197 (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1198 req->r_op == CEPH_MDS_OP_MKSNAP)) {
1199 struct dentry *dn = req->r_dentry;
1200 struct inode *dir = req->r_locked_dir;
1201
1202 /* fill out a snapdir LOOKUPSNAP dentry */
1203 BUG_ON(!dn);
1204 BUG_ON(!dir);
1205 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1206 dout(" linking snapped dir %p to dn %p\n", in, dn);
1207 ceph_dir_clear_complete(dir);
1208 ihold(in);
1209 dn = splice_dentry(dn, in, NULL);
1210 if (IS_ERR(dn)) {
1211 err = PTR_ERR(dn);
1212 goto done;
1213 }
1214 req->r_dentry = dn; /* may have spliced */
1215 }
1216done:
1217 dout("fill_trace done err=%d\n", err);
1218 return err;
1219}
1220
1221/*
1222 * Prepopulate our cache with readdir results, leases, etc.
1223 */
1224static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1225 struct ceph_mds_session *session)
1226{
1227 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1228 int i, err = 0;
1229
1230 for (i = 0; i < rinfo->dir_nr; i++) {
1231 struct ceph_vino vino;
1232 struct inode *in;
1233 int rc;
1234
1235 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1236 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1237
1238 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1239 if (IS_ERR(in)) {
1240 err = PTR_ERR(in);
1241 dout("new_inode badness got %d\n", err);
1242 continue;
1243 }
1244 rc = fill_inode(in, &rinfo->dir_in[i], NULL, session,
1245 req->r_request_started, -1,
1246 &req->r_caps_reservation);
1247 if (rc < 0) {
1248 pr_err("fill_inode badness on %p got %d\n", in, rc);
1249 err = rc;
1250 continue;
1251 }
1252 }
1253
1254 return err;
1255}
1256
1257int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1258 struct ceph_mds_session *session)
1259{
1260 struct dentry *parent = req->r_dentry;
1261 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1262 struct qstr dname;
1263 struct dentry *dn;
1264 struct inode *in;
1265 int err = 0, ret, i;
1266 struct inode *snapdir = NULL;
1267 struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1268 struct ceph_dentry_info *di;
1269 u64 r_readdir_offset = req->r_readdir_offset;
1270 u32 frag = le32_to_cpu(rhead->args.readdir.frag);
1271
1272 if (rinfo->dir_dir &&
1273 le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1274 dout("readdir_prepopulate got new frag %x -> %x\n",
1275 frag, le32_to_cpu(rinfo->dir_dir->frag));
1276 frag = le32_to_cpu(rinfo->dir_dir->frag);
1277 if (ceph_frag_is_leftmost(frag))
1278 r_readdir_offset = 2;
1279 else
1280 r_readdir_offset = 0;
1281 }
1282
1283 if (req->r_aborted)
1284 return readdir_prepopulate_inodes_only(req, session);
1285
1286 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1287 snapdir = ceph_get_snapdir(parent->d_inode);
1288 parent = d_find_alias(snapdir);
1289 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1290 rinfo->dir_nr, parent);
1291 } else {
1292 dout("readdir_prepopulate %d items under dn %p\n",
1293 rinfo->dir_nr, parent);
1294 if (rinfo->dir_dir)
1295 ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1296 }
1297
1298 /* FIXME: release caps/leases if error occurs */
1299 for (i = 0; i < rinfo->dir_nr; i++) {
1300 struct ceph_vino vino;
1301
1302 dname.name = rinfo->dir_dname[i];
1303 dname.len = rinfo->dir_dname_len[i];
1304 dname.hash = full_name_hash(dname.name, dname.len);
1305
1306 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1307 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1308
1309retry_lookup:
1310 dn = d_lookup(parent, &dname);
1311 dout("d_lookup on parent=%p name=%.*s got %p\n",
1312 parent, dname.len, dname.name, dn);
1313
1314 if (!dn) {
1315 dn = d_alloc(parent, &dname);
1316 dout("d_alloc %p '%.*s' = %p\n", parent,
1317 dname.len, dname.name, dn);
1318 if (dn == NULL) {
1319 dout("d_alloc badness\n");
1320 err = -ENOMEM;
1321 goto out;
1322 }
1323 ret = ceph_init_dentry(dn);
1324 if (ret < 0) {
1325 dput(dn);
1326 err = ret;
1327 goto out;
1328 }
1329 } else if (dn->d_inode &&
1330 (ceph_ino(dn->d_inode) != vino.ino ||
1331 ceph_snap(dn->d_inode) != vino.snap)) {
1332 dout(" dn %p points to wrong inode %p\n",
1333 dn, dn->d_inode);
1334 d_delete(dn);
1335 dput(dn);
1336 goto retry_lookup;
1337 } else {
1338 /* reorder parent's d_subdirs */
1339 spin_lock(&parent->d_lock);
1340 spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
1341 list_move(&dn->d_u.d_child, &parent->d_subdirs);
1342 spin_unlock(&dn->d_lock);
1343 spin_unlock(&parent->d_lock);
1344 }
1345
1346 /* inode */
1347 if (dn->d_inode) {
1348 in = dn->d_inode;
1349 } else {
1350 in = ceph_get_inode(parent->d_sb, vino);
1351 if (IS_ERR(in)) {
1352 dout("new_inode badness\n");
1353 d_drop(dn);
1354 dput(dn);
1355 err = PTR_ERR(in);
1356 goto out;
1357 }
1358 }
1359
1360 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1361 req->r_request_started, -1,
1362 &req->r_caps_reservation) < 0) {
1363 pr_err("fill_inode badness on %p\n", in);
1364 if (!dn->d_inode)
1365 iput(in);
1366 d_drop(dn);
1367 goto next_item;
1368 }
1369
1370 if (!dn->d_inode) {
1371 dn = splice_dentry(dn, in, NULL);
1372 if (IS_ERR(dn)) {
1373 err = PTR_ERR(dn);
1374 dn = NULL;
1375 goto next_item;
1376 }
1377 }
1378
1379 di = dn->d_fsdata;
1380 di->offset = ceph_make_fpos(frag, i + r_readdir_offset);
1381
1382 update_dentry_lease(dn, rinfo->dir_dlease[i],
1383 req->r_session,
1384 req->r_request_started);
1385next_item:
1386 if (dn)
1387 dput(dn);
1388 }
1389 if (err == 0)
1390 req->r_did_prepopulate = true;
1391
1392out:
1393 if (snapdir) {
1394 iput(snapdir);
1395 dput(parent);
1396 }
1397 dout("readdir_prepopulate done\n");
1398 return err;
1399}
1400
1401int ceph_inode_set_size(struct inode *inode, loff_t size)
1402{
1403 struct ceph_inode_info *ci = ceph_inode(inode);
1404 int ret = 0;
1405
1406 spin_lock(&ci->i_ceph_lock);
1407 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1408 inode->i_size = size;
1409 inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1410
1411 /* tell the MDS if we are approaching max_size */
1412 if ((size << 1) >= ci->i_max_size &&
1413 (ci->i_reported_size << 1) < ci->i_max_size)
1414 ret = 1;
1415
1416 spin_unlock(&ci->i_ceph_lock);
1417 return ret;
1418}
1419
1420/*
1421 * Write back inode data in a worker thread. (This can't be done
1422 * in the message handler context.)
1423 */
1424void ceph_queue_writeback(struct inode *inode)
1425{
1426 ihold(inode);
1427 if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1428 &ceph_inode(inode)->i_wb_work)) {
1429 dout("ceph_queue_writeback %p\n", inode);
1430 } else {
1431 dout("ceph_queue_writeback %p failed\n", inode);
1432 iput(inode);
1433 }
1434}
1435
1436static void ceph_writeback_work(struct work_struct *work)
1437{
1438 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1439 i_wb_work);
1440 struct inode *inode = &ci->vfs_inode;
1441
1442 dout("writeback %p\n", inode);
1443 filemap_fdatawrite(&inode->i_data);
1444 iput(inode);
1445}
1446
1447/*
1448 * queue an async invalidation
1449 */
1450void ceph_queue_invalidate(struct inode *inode)
1451{
1452 ihold(inode);
1453 if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1454 &ceph_inode(inode)->i_pg_inv_work)) {
1455 dout("ceph_queue_invalidate %p\n", inode);
1456 } else {
1457 dout("ceph_queue_invalidate %p failed\n", inode);
1458 iput(inode);
1459 }
1460}
1461
1462/*
1463 * Invalidate inode pages in a worker thread. (This can't be done
1464 * in the message handler context.)
1465 */
1466static void ceph_invalidate_work(struct work_struct *work)
1467{
1468 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1469 i_pg_inv_work);
1470 struct inode *inode = &ci->vfs_inode;
1471 u32 orig_gen;
1472 int check = 0;
1473
1474 mutex_lock(&ci->i_truncate_mutex);
1475 spin_lock(&ci->i_ceph_lock);
1476 dout("invalidate_pages %p gen %d revoking %d\n", inode,
1477 ci->i_rdcache_gen, ci->i_rdcache_revoking);
1478 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1479 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1480 check = 1;
1481 spin_unlock(&ci->i_ceph_lock);
1482 mutex_unlock(&ci->i_truncate_mutex);
1483 goto out;
1484 }
1485 orig_gen = ci->i_rdcache_gen;
1486 spin_unlock(&ci->i_ceph_lock);
1487
1488 truncate_inode_pages(inode->i_mapping, 0);
1489
1490 spin_lock(&ci->i_ceph_lock);
1491 if (orig_gen == ci->i_rdcache_gen &&
1492 orig_gen == ci->i_rdcache_revoking) {
1493 dout("invalidate_pages %p gen %d successful\n", inode,
1494 ci->i_rdcache_gen);
1495 ci->i_rdcache_revoking--;
1496 check = 1;
1497 } else {
1498 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1499 inode, orig_gen, ci->i_rdcache_gen,
1500 ci->i_rdcache_revoking);
1501 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1502 check = 1;
1503 }
1504 spin_unlock(&ci->i_ceph_lock);
1505 mutex_unlock(&ci->i_truncate_mutex);
1506out:
1507 if (check)
1508 ceph_check_caps(ci, 0, NULL);
1509 iput(inode);
1510}
1511
1512
1513/*
1514 * called by trunc_wq;
1515 *
1516 * We also truncate in a separate thread as well.
1517 */
1518static void ceph_vmtruncate_work(struct work_struct *work)
1519{
1520 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1521 i_vmtruncate_work);
1522 struct inode *inode = &ci->vfs_inode;
1523
1524 dout("vmtruncate_work %p\n", inode);
1525 __ceph_do_pending_vmtruncate(inode);
1526 iput(inode);
1527}
1528
1529/*
1530 * Queue an async vmtruncate. If we fail to queue work, we will handle
1531 * the truncation the next time we call __ceph_do_pending_vmtruncate.
1532 */
1533void ceph_queue_vmtruncate(struct inode *inode)
1534{
1535 struct ceph_inode_info *ci = ceph_inode(inode);
1536
1537 ihold(inode);
1538
1539 if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1540 &ci->i_vmtruncate_work)) {
1541 dout("ceph_queue_vmtruncate %p\n", inode);
1542 } else {
1543 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1544 inode, ci->i_truncate_pending);
1545 iput(inode);
1546 }
1547}
1548
1549/*
1550 * Make sure any pending truncation is applied before doing anything
1551 * that may depend on it.
1552 */
1553void __ceph_do_pending_vmtruncate(struct inode *inode)
1554{
1555 struct ceph_inode_info *ci = ceph_inode(inode);
1556 u64 to;
1557 int wrbuffer_refs, finish = 0;
1558
1559 mutex_lock(&ci->i_truncate_mutex);
1560retry:
1561 spin_lock(&ci->i_ceph_lock);
1562 if (ci->i_truncate_pending == 0) {
1563 dout("__do_pending_vmtruncate %p none pending\n", inode);
1564 spin_unlock(&ci->i_ceph_lock);
1565 mutex_unlock(&ci->i_truncate_mutex);
1566 return;
1567 }
1568
1569 /*
1570 * make sure any dirty snapped pages are flushed before we
1571 * possibly truncate them.. so write AND block!
1572 */
1573 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1574 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1575 inode);
1576 spin_unlock(&ci->i_ceph_lock);
1577 filemap_write_and_wait_range(&inode->i_data, 0,
1578 inode->i_sb->s_maxbytes);
1579 goto retry;
1580 }
1581
1582 /* there should be no reader or writer */
1583 WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1584
1585 to = ci->i_truncate_size;
1586 wrbuffer_refs = ci->i_wrbuffer_ref;
1587 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1588 ci->i_truncate_pending, to);
1589 spin_unlock(&ci->i_ceph_lock);
1590
1591 truncate_inode_pages(inode->i_mapping, to);
1592
1593 spin_lock(&ci->i_ceph_lock);
1594 if (to == ci->i_truncate_size) {
1595 ci->i_truncate_pending = 0;
1596 finish = 1;
1597 }
1598 spin_unlock(&ci->i_ceph_lock);
1599 if (!finish)
1600 goto retry;
1601
1602 mutex_unlock(&ci->i_truncate_mutex);
1603
1604 if (wrbuffer_refs == 0)
1605 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1606
1607 wake_up_all(&ci->i_cap_wq);
1608}
1609
1610/*
1611 * symlinks
1612 */
1613static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1614{
1615 struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1616 nd_set_link(nd, ci->i_symlink);
1617 return NULL;
1618}
1619
1620static const struct inode_operations ceph_symlink_iops = {
1621 .readlink = generic_readlink,
1622 .follow_link = ceph_sym_follow_link,
1623 .setattr = ceph_setattr,
1624 .getattr = ceph_getattr,
1625 .setxattr = ceph_setxattr,
1626 .getxattr = ceph_getxattr,
1627 .listxattr = ceph_listxattr,
1628 .removexattr = ceph_removexattr,
1629};
1630
1631/*
1632 * setattr
1633 */
1634int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1635{
1636 struct inode *inode = dentry->d_inode;
1637 struct ceph_inode_info *ci = ceph_inode(inode);
1638 const unsigned int ia_valid = attr->ia_valid;
1639 struct ceph_mds_request *req;
1640 struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1641 int issued;
1642 int release = 0, dirtied = 0;
1643 int mask = 0;
1644 int err = 0;
1645 int inode_dirty_flags = 0;
1646
1647 if (ceph_snap(inode) != CEPH_NOSNAP)
1648 return -EROFS;
1649
1650 err = inode_change_ok(inode, attr);
1651 if (err != 0)
1652 return err;
1653
1654 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1655 USE_AUTH_MDS);
1656 if (IS_ERR(req))
1657 return PTR_ERR(req);
1658
1659 spin_lock(&ci->i_ceph_lock);
1660 issued = __ceph_caps_issued(ci, NULL);
1661 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1662
1663 if (ia_valid & ATTR_UID) {
1664 dout("setattr %p uid %d -> %d\n", inode,
1665 from_kuid(&init_user_ns, inode->i_uid),
1666 from_kuid(&init_user_ns, attr->ia_uid));
1667 if (issued & CEPH_CAP_AUTH_EXCL) {
1668 inode->i_uid = attr->ia_uid;
1669 dirtied |= CEPH_CAP_AUTH_EXCL;
1670 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1671 !uid_eq(attr->ia_uid, inode->i_uid)) {
1672 req->r_args.setattr.uid = cpu_to_le32(
1673 from_kuid(&init_user_ns, attr->ia_uid));
1674 mask |= CEPH_SETATTR_UID;
1675 release |= CEPH_CAP_AUTH_SHARED;
1676 }
1677 }
1678 if (ia_valid & ATTR_GID) {
1679 dout("setattr %p gid %d -> %d\n", inode,
1680 from_kgid(&init_user_ns, inode->i_gid),
1681 from_kgid(&init_user_ns, attr->ia_gid));
1682 if (issued & CEPH_CAP_AUTH_EXCL) {
1683 inode->i_gid = attr->ia_gid;
1684 dirtied |= CEPH_CAP_AUTH_EXCL;
1685 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1686 !gid_eq(attr->ia_gid, inode->i_gid)) {
1687 req->r_args.setattr.gid = cpu_to_le32(
1688 from_kgid(&init_user_ns, attr->ia_gid));
1689 mask |= CEPH_SETATTR_GID;
1690 release |= CEPH_CAP_AUTH_SHARED;
1691 }
1692 }
1693 if (ia_valid & ATTR_MODE) {
1694 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1695 attr->ia_mode);
1696 if (issued & CEPH_CAP_AUTH_EXCL) {
1697 inode->i_mode = attr->ia_mode;
1698 dirtied |= CEPH_CAP_AUTH_EXCL;
1699 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1700 attr->ia_mode != inode->i_mode) {
1701 inode->i_mode = attr->ia_mode;
1702 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1703 mask |= CEPH_SETATTR_MODE;
1704 release |= CEPH_CAP_AUTH_SHARED;
1705 }
1706 }
1707
1708 if (ia_valid & ATTR_ATIME) {
1709 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1710 inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1711 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1712 if (issued & CEPH_CAP_FILE_EXCL) {
1713 ci->i_time_warp_seq++;
1714 inode->i_atime = attr->ia_atime;
1715 dirtied |= CEPH_CAP_FILE_EXCL;
1716 } else if ((issued & CEPH_CAP_FILE_WR) &&
1717 timespec_compare(&inode->i_atime,
1718 &attr->ia_atime) < 0) {
1719 inode->i_atime = attr->ia_atime;
1720 dirtied |= CEPH_CAP_FILE_WR;
1721 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1722 !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1723 ceph_encode_timespec(&req->r_args.setattr.atime,
1724 &attr->ia_atime);
1725 mask |= CEPH_SETATTR_ATIME;
1726 release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1727 CEPH_CAP_FILE_WR;
1728 }
1729 }
1730 if (ia_valid & ATTR_MTIME) {
1731 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1732 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1733 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1734 if (issued & CEPH_CAP_FILE_EXCL) {
1735 ci->i_time_warp_seq++;
1736 inode->i_mtime = attr->ia_mtime;
1737 dirtied |= CEPH_CAP_FILE_EXCL;
1738 } else if ((issued & CEPH_CAP_FILE_WR) &&
1739 timespec_compare(&inode->i_mtime,
1740 &attr->ia_mtime) < 0) {
1741 inode->i_mtime = attr->ia_mtime;
1742 dirtied |= CEPH_CAP_FILE_WR;
1743 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1744 !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1745 ceph_encode_timespec(&req->r_args.setattr.mtime,
1746 &attr->ia_mtime);
1747 mask |= CEPH_SETATTR_MTIME;
1748 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1749 CEPH_CAP_FILE_WR;
1750 }
1751 }
1752 if (ia_valid & ATTR_SIZE) {
1753 dout("setattr %p size %lld -> %lld\n", inode,
1754 inode->i_size, attr->ia_size);
1755 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1756 err = -EINVAL;
1757 goto out;
1758 }
1759 if ((issued & CEPH_CAP_FILE_EXCL) &&
1760 attr->ia_size > inode->i_size) {
1761 inode->i_size = attr->ia_size;
1762 inode->i_blocks =
1763 (attr->ia_size + (1 << 9) - 1) >> 9;
1764 inode->i_ctime = attr->ia_ctime;
1765 ci->i_reported_size = attr->ia_size;
1766 dirtied |= CEPH_CAP_FILE_EXCL;
1767 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1768 attr->ia_size != inode->i_size) {
1769 req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1770 req->r_args.setattr.old_size =
1771 cpu_to_le64(inode->i_size);
1772 mask |= CEPH_SETATTR_SIZE;
1773 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1774 CEPH_CAP_FILE_WR;
1775 }
1776 }
1777
1778 /* these do nothing */
1779 if (ia_valid & ATTR_CTIME) {
1780 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1781 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1782 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1783 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1784 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1785 only ? "ctime only" : "ignored");
1786 inode->i_ctime = attr->ia_ctime;
1787 if (only) {
1788 /*
1789 * if kernel wants to dirty ctime but nothing else,
1790 * we need to choose a cap to dirty under, or do
1791 * a almost-no-op setattr
1792 */
1793 if (issued & CEPH_CAP_AUTH_EXCL)
1794 dirtied |= CEPH_CAP_AUTH_EXCL;
1795 else if (issued & CEPH_CAP_FILE_EXCL)
1796 dirtied |= CEPH_CAP_FILE_EXCL;
1797 else if (issued & CEPH_CAP_XATTR_EXCL)
1798 dirtied |= CEPH_CAP_XATTR_EXCL;
1799 else
1800 mask |= CEPH_SETATTR_CTIME;
1801 }
1802 }
1803 if (ia_valid & ATTR_FILE)
1804 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1805
1806 if (dirtied) {
1807 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied);
1808 inode->i_ctime = CURRENT_TIME;
1809 }
1810
1811 release &= issued;
1812 spin_unlock(&ci->i_ceph_lock);
1813
1814 if (inode_dirty_flags)
1815 __mark_inode_dirty(inode, inode_dirty_flags);
1816
1817 if (ia_valid & ATTR_MODE) {
1818 err = posix_acl_chmod(inode, attr->ia_mode);
1819 if (err)
1820 goto out_put;
1821 }
1822
1823 if (mask) {
1824 req->r_inode = inode;
1825 ihold(inode);
1826 req->r_inode_drop = release;
1827 req->r_args.setattr.mask = cpu_to_le32(mask);
1828 req->r_num_caps = 1;
1829 err = ceph_mdsc_do_request(mdsc, NULL, req);
1830 }
1831 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1832 ceph_cap_string(dirtied), mask);
1833
1834 ceph_mdsc_put_request(req);
1835 if (mask & CEPH_SETATTR_SIZE)
1836 __ceph_do_pending_vmtruncate(inode);
1837 return err;
1838out:
1839 spin_unlock(&ci->i_ceph_lock);
1840out_put:
1841 ceph_mdsc_put_request(req);
1842 return err;
1843}
1844
1845/*
1846 * Verify that we have a lease on the given mask. If not,
1847 * do a getattr against an mds.
1848 */
1849int ceph_do_getattr(struct inode *inode, int mask)
1850{
1851 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
1852 struct ceph_mds_client *mdsc = fsc->mdsc;
1853 struct ceph_mds_request *req;
1854 int err;
1855
1856 if (ceph_snap(inode) == CEPH_SNAPDIR) {
1857 dout("do_getattr inode %p SNAPDIR\n", inode);
1858 return 0;
1859 }
1860
1861 dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode);
1862 if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1863 return 0;
1864
1865 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1866 if (IS_ERR(req))
1867 return PTR_ERR(req);
1868 req->r_inode = inode;
1869 ihold(inode);
1870 req->r_num_caps = 1;
1871 req->r_args.getattr.mask = cpu_to_le32(mask);
1872 err = ceph_mdsc_do_request(mdsc, NULL, req);
1873 ceph_mdsc_put_request(req);
1874 dout("do_getattr result=%d\n", err);
1875 return err;
1876}
1877
1878
1879/*
1880 * Check inode permissions. We verify we have a valid value for
1881 * the AUTH cap, then call the generic handler.
1882 */
1883int ceph_permission(struct inode *inode, int mask)
1884{
1885 int err;
1886
1887 if (mask & MAY_NOT_BLOCK)
1888 return -ECHILD;
1889
1890 err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1891
1892 if (!err)
1893 err = generic_permission(inode, mask);
1894 return err;
1895}
1896
1897/*
1898 * Get all attributes. Hopefully somedata we'll have a statlite()
1899 * and can limit the fields we require to be accurate.
1900 */
1901int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1902 struct kstat *stat)
1903{
1904 struct inode *inode = dentry->d_inode;
1905 struct ceph_inode_info *ci = ceph_inode(inode);
1906 int err;
1907
1908 err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1909 if (!err) {
1910 generic_fillattr(inode, stat);
1911 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
1912 if (ceph_snap(inode) != CEPH_NOSNAP)
1913 stat->dev = ceph_snap(inode);
1914 else
1915 stat->dev = 0;
1916 if (S_ISDIR(inode->i_mode)) {
1917 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
1918 RBYTES))
1919 stat->size = ci->i_rbytes;
1920 else
1921 stat->size = ci->i_files + ci->i_subdirs;
1922 stat->blocks = 0;
1923 stat->blksize = 65536;
1924 }
1925 }
1926 return err;
1927}
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/ceph/ceph_debug.h>
3
4#include <linux/module.h>
5#include <linux/fs.h>
6#include <linux/slab.h>
7#include <linux/string.h>
8#include <linux/uaccess.h>
9#include <linux/kernel.h>
10#include <linux/writeback.h>
11#include <linux/vmalloc.h>
12#include <linux/xattr.h>
13#include <linux/posix_acl.h>
14#include <linux/random.h>
15#include <linux/sort.h>
16#include <linux/iversion.h>
17
18#include "super.h"
19#include "mds_client.h"
20#include "cache.h"
21#include <linux/ceph/decode.h>
22
23/*
24 * Ceph inode operations
25 *
26 * Implement basic inode helpers (get, alloc) and inode ops (getattr,
27 * setattr, etc.), xattr helpers, and helpers for assimilating
28 * metadata returned by the MDS into our cache.
29 *
30 * Also define helpers for doing asynchronous writeback, invalidation,
31 * and truncation for the benefit of those who can't afford to block
32 * (typically because they are in the message handler path).
33 */
34
35static const struct inode_operations ceph_symlink_iops;
36
37static void ceph_inode_work(struct work_struct *work);
38
39/*
40 * find or create an inode, given the ceph ino number
41 */
42static int ceph_set_ino_cb(struct inode *inode, void *data)
43{
44 struct ceph_inode_info *ci = ceph_inode(inode);
45
46 ci->i_vino = *(struct ceph_vino *)data;
47 inode->i_ino = ceph_vino_to_ino_t(ci->i_vino);
48 inode_set_iversion_raw(inode, 0);
49 return 0;
50}
51
52struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
53{
54 struct inode *inode;
55
56 inode = iget5_locked(sb, (unsigned long)vino.ino, ceph_ino_compare,
57 ceph_set_ino_cb, &vino);
58 if (!inode)
59 return ERR_PTR(-ENOMEM);
60
61 dout("get_inode on %llu=%llx.%llx got %p new %d\n", ceph_present_inode(inode),
62 ceph_vinop(inode), inode, !!(inode->i_state & I_NEW));
63 return inode;
64}
65
66/*
67 * get/constuct snapdir inode for a given directory
68 */
69struct inode *ceph_get_snapdir(struct inode *parent)
70{
71 struct ceph_vino vino = {
72 .ino = ceph_ino(parent),
73 .snap = CEPH_SNAPDIR,
74 };
75 struct inode *inode = ceph_get_inode(parent->i_sb, vino);
76 struct ceph_inode_info *ci = ceph_inode(inode);
77
78 BUG_ON(!S_ISDIR(parent->i_mode));
79 if (IS_ERR(inode))
80 return inode;
81 inode->i_mode = parent->i_mode;
82 inode->i_uid = parent->i_uid;
83 inode->i_gid = parent->i_gid;
84 inode->i_mtime = parent->i_mtime;
85 inode->i_ctime = parent->i_ctime;
86 inode->i_atime = parent->i_atime;
87 inode->i_op = &ceph_snapdir_iops;
88 inode->i_fop = &ceph_snapdir_fops;
89 ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
90 ci->i_rbytes = 0;
91 ci->i_btime = ceph_inode(parent)->i_btime;
92
93 if (inode->i_state & I_NEW)
94 unlock_new_inode(inode);
95
96 return inode;
97}
98
99const struct inode_operations ceph_file_iops = {
100 .permission = ceph_permission,
101 .setattr = ceph_setattr,
102 .getattr = ceph_getattr,
103 .listxattr = ceph_listxattr,
104 .get_acl = ceph_get_acl,
105 .set_acl = ceph_set_acl,
106};
107
108
109/*
110 * We use a 'frag tree' to keep track of the MDS's directory fragments
111 * for a given inode (usually there is just a single fragment). We
112 * need to know when a child frag is delegated to a new MDS, or when
113 * it is flagged as replicated, so we can direct our requests
114 * accordingly.
115 */
116
117/*
118 * find/create a frag in the tree
119 */
120static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
121 u32 f)
122{
123 struct rb_node **p;
124 struct rb_node *parent = NULL;
125 struct ceph_inode_frag *frag;
126 int c;
127
128 p = &ci->i_fragtree.rb_node;
129 while (*p) {
130 parent = *p;
131 frag = rb_entry(parent, struct ceph_inode_frag, node);
132 c = ceph_frag_compare(f, frag->frag);
133 if (c < 0)
134 p = &(*p)->rb_left;
135 else if (c > 0)
136 p = &(*p)->rb_right;
137 else
138 return frag;
139 }
140
141 frag = kmalloc(sizeof(*frag), GFP_NOFS);
142 if (!frag)
143 return ERR_PTR(-ENOMEM);
144
145 frag->frag = f;
146 frag->split_by = 0;
147 frag->mds = -1;
148 frag->ndist = 0;
149
150 rb_link_node(&frag->node, parent, p);
151 rb_insert_color(&frag->node, &ci->i_fragtree);
152
153 dout("get_or_create_frag added %llx.%llx frag %x\n",
154 ceph_vinop(&ci->vfs_inode), f);
155 return frag;
156}
157
158/*
159 * find a specific frag @f
160 */
161struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
162{
163 struct rb_node *n = ci->i_fragtree.rb_node;
164
165 while (n) {
166 struct ceph_inode_frag *frag =
167 rb_entry(n, struct ceph_inode_frag, node);
168 int c = ceph_frag_compare(f, frag->frag);
169 if (c < 0)
170 n = n->rb_left;
171 else if (c > 0)
172 n = n->rb_right;
173 else
174 return frag;
175 }
176 return NULL;
177}
178
179/*
180 * Choose frag containing the given value @v. If @pfrag is
181 * specified, copy the frag delegation info to the caller if
182 * it is present.
183 */
184static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
185 struct ceph_inode_frag *pfrag, int *found)
186{
187 u32 t = ceph_frag_make(0, 0);
188 struct ceph_inode_frag *frag;
189 unsigned nway, i;
190 u32 n;
191
192 if (found)
193 *found = 0;
194
195 while (1) {
196 WARN_ON(!ceph_frag_contains_value(t, v));
197 frag = __ceph_find_frag(ci, t);
198 if (!frag)
199 break; /* t is a leaf */
200 if (frag->split_by == 0) {
201 if (pfrag)
202 memcpy(pfrag, frag, sizeof(*pfrag));
203 if (found)
204 *found = 1;
205 break;
206 }
207
208 /* choose child */
209 nway = 1 << frag->split_by;
210 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
211 frag->split_by, nway);
212 for (i = 0; i < nway; i++) {
213 n = ceph_frag_make_child(t, frag->split_by, i);
214 if (ceph_frag_contains_value(n, v)) {
215 t = n;
216 break;
217 }
218 }
219 BUG_ON(i == nway);
220 }
221 dout("choose_frag(%x) = %x\n", v, t);
222
223 return t;
224}
225
226u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
227 struct ceph_inode_frag *pfrag, int *found)
228{
229 u32 ret;
230 mutex_lock(&ci->i_fragtree_mutex);
231 ret = __ceph_choose_frag(ci, v, pfrag, found);
232 mutex_unlock(&ci->i_fragtree_mutex);
233 return ret;
234}
235
236/*
237 * Process dirfrag (delegation) info from the mds. Include leaf
238 * fragment in tree ONLY if ndist > 0. Otherwise, only
239 * branches/splits are included in i_fragtree)
240 */
241static int ceph_fill_dirfrag(struct inode *inode,
242 struct ceph_mds_reply_dirfrag *dirinfo)
243{
244 struct ceph_inode_info *ci = ceph_inode(inode);
245 struct ceph_inode_frag *frag;
246 u32 id = le32_to_cpu(dirinfo->frag);
247 int mds = le32_to_cpu(dirinfo->auth);
248 int ndist = le32_to_cpu(dirinfo->ndist);
249 int diri_auth = -1;
250 int i;
251 int err = 0;
252
253 spin_lock(&ci->i_ceph_lock);
254 if (ci->i_auth_cap)
255 diri_auth = ci->i_auth_cap->mds;
256 spin_unlock(&ci->i_ceph_lock);
257
258 if (mds == -1) /* CDIR_AUTH_PARENT */
259 mds = diri_auth;
260
261 mutex_lock(&ci->i_fragtree_mutex);
262 if (ndist == 0 && mds == diri_auth) {
263 /* no delegation info needed. */
264 frag = __ceph_find_frag(ci, id);
265 if (!frag)
266 goto out;
267 if (frag->split_by == 0) {
268 /* tree leaf, remove */
269 dout("fill_dirfrag removed %llx.%llx frag %x"
270 " (no ref)\n", ceph_vinop(inode), id);
271 rb_erase(&frag->node, &ci->i_fragtree);
272 kfree(frag);
273 } else {
274 /* tree branch, keep and clear */
275 dout("fill_dirfrag cleared %llx.%llx frag %x"
276 " referral\n", ceph_vinop(inode), id);
277 frag->mds = -1;
278 frag->ndist = 0;
279 }
280 goto out;
281 }
282
283
284 /* find/add this frag to store mds delegation info */
285 frag = __get_or_create_frag(ci, id);
286 if (IS_ERR(frag)) {
287 /* this is not the end of the world; we can continue
288 with bad/inaccurate delegation info */
289 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
290 ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
291 err = -ENOMEM;
292 goto out;
293 }
294
295 frag->mds = mds;
296 frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
297 for (i = 0; i < frag->ndist; i++)
298 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
299 dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
300 ceph_vinop(inode), frag->frag, frag->ndist);
301
302out:
303 mutex_unlock(&ci->i_fragtree_mutex);
304 return err;
305}
306
307static int frag_tree_split_cmp(const void *l, const void *r)
308{
309 struct ceph_frag_tree_split *ls = (struct ceph_frag_tree_split*)l;
310 struct ceph_frag_tree_split *rs = (struct ceph_frag_tree_split*)r;
311 return ceph_frag_compare(le32_to_cpu(ls->frag),
312 le32_to_cpu(rs->frag));
313}
314
315static bool is_frag_child(u32 f, struct ceph_inode_frag *frag)
316{
317 if (!frag)
318 return f == ceph_frag_make(0, 0);
319 if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by)
320 return false;
321 return ceph_frag_contains_value(frag->frag, ceph_frag_value(f));
322}
323
324static int ceph_fill_fragtree(struct inode *inode,
325 struct ceph_frag_tree_head *fragtree,
326 struct ceph_mds_reply_dirfrag *dirinfo)
327{
328 struct ceph_inode_info *ci = ceph_inode(inode);
329 struct ceph_inode_frag *frag, *prev_frag = NULL;
330 struct rb_node *rb_node;
331 unsigned i, split_by, nsplits;
332 u32 id;
333 bool update = false;
334
335 mutex_lock(&ci->i_fragtree_mutex);
336 nsplits = le32_to_cpu(fragtree->nsplits);
337 if (nsplits != ci->i_fragtree_nsplits) {
338 update = true;
339 } else if (nsplits) {
340 i = prandom_u32() % nsplits;
341 id = le32_to_cpu(fragtree->splits[i].frag);
342 if (!__ceph_find_frag(ci, id))
343 update = true;
344 } else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) {
345 rb_node = rb_first(&ci->i_fragtree);
346 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
347 if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node))
348 update = true;
349 }
350 if (!update && dirinfo) {
351 id = le32_to_cpu(dirinfo->frag);
352 if (id != __ceph_choose_frag(ci, id, NULL, NULL))
353 update = true;
354 }
355 if (!update)
356 goto out_unlock;
357
358 if (nsplits > 1) {
359 sort(fragtree->splits, nsplits, sizeof(fragtree->splits[0]),
360 frag_tree_split_cmp, NULL);
361 }
362
363 dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode));
364 rb_node = rb_first(&ci->i_fragtree);
365 for (i = 0; i < nsplits; i++) {
366 id = le32_to_cpu(fragtree->splits[i].frag);
367 split_by = le32_to_cpu(fragtree->splits[i].by);
368 if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) {
369 pr_err("fill_fragtree %llx.%llx invalid split %d/%u, "
370 "frag %x split by %d\n", ceph_vinop(inode),
371 i, nsplits, id, split_by);
372 continue;
373 }
374 frag = NULL;
375 while (rb_node) {
376 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
377 if (ceph_frag_compare(frag->frag, id) >= 0) {
378 if (frag->frag != id)
379 frag = NULL;
380 else
381 rb_node = rb_next(rb_node);
382 break;
383 }
384 rb_node = rb_next(rb_node);
385 /* delete stale split/leaf node */
386 if (frag->split_by > 0 ||
387 !is_frag_child(frag->frag, prev_frag)) {
388 rb_erase(&frag->node, &ci->i_fragtree);
389 if (frag->split_by > 0)
390 ci->i_fragtree_nsplits--;
391 kfree(frag);
392 }
393 frag = NULL;
394 }
395 if (!frag) {
396 frag = __get_or_create_frag(ci, id);
397 if (IS_ERR(frag))
398 continue;
399 }
400 if (frag->split_by == 0)
401 ci->i_fragtree_nsplits++;
402 frag->split_by = split_by;
403 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
404 prev_frag = frag;
405 }
406 while (rb_node) {
407 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
408 rb_node = rb_next(rb_node);
409 /* delete stale split/leaf node */
410 if (frag->split_by > 0 ||
411 !is_frag_child(frag->frag, prev_frag)) {
412 rb_erase(&frag->node, &ci->i_fragtree);
413 if (frag->split_by > 0)
414 ci->i_fragtree_nsplits--;
415 kfree(frag);
416 }
417 }
418out_unlock:
419 mutex_unlock(&ci->i_fragtree_mutex);
420 return 0;
421}
422
423/*
424 * initialize a newly allocated inode.
425 */
426struct inode *ceph_alloc_inode(struct super_block *sb)
427{
428 struct ceph_inode_info *ci;
429 int i;
430
431 ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
432 if (!ci)
433 return NULL;
434
435 dout("alloc_inode %p\n", &ci->vfs_inode);
436
437 spin_lock_init(&ci->i_ceph_lock);
438
439 ci->i_version = 0;
440 ci->i_inline_version = 0;
441 ci->i_time_warp_seq = 0;
442 ci->i_ceph_flags = 0;
443 atomic64_set(&ci->i_ordered_count, 1);
444 atomic64_set(&ci->i_release_count, 1);
445 atomic64_set(&ci->i_complete_seq[0], 0);
446 atomic64_set(&ci->i_complete_seq[1], 0);
447 ci->i_symlink = NULL;
448
449 ci->i_max_bytes = 0;
450 ci->i_max_files = 0;
451
452 memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
453 memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
454 RCU_INIT_POINTER(ci->i_layout.pool_ns, NULL);
455
456 ci->i_fragtree = RB_ROOT;
457 mutex_init(&ci->i_fragtree_mutex);
458
459 ci->i_xattrs.blob = NULL;
460 ci->i_xattrs.prealloc_blob = NULL;
461 ci->i_xattrs.dirty = false;
462 ci->i_xattrs.index = RB_ROOT;
463 ci->i_xattrs.count = 0;
464 ci->i_xattrs.names_size = 0;
465 ci->i_xattrs.vals_size = 0;
466 ci->i_xattrs.version = 0;
467 ci->i_xattrs.index_version = 0;
468
469 ci->i_caps = RB_ROOT;
470 ci->i_auth_cap = NULL;
471 ci->i_dirty_caps = 0;
472 ci->i_flushing_caps = 0;
473 INIT_LIST_HEAD(&ci->i_dirty_item);
474 INIT_LIST_HEAD(&ci->i_flushing_item);
475 ci->i_prealloc_cap_flush = NULL;
476 INIT_LIST_HEAD(&ci->i_cap_flush_list);
477 init_waitqueue_head(&ci->i_cap_wq);
478 ci->i_hold_caps_max = 0;
479 INIT_LIST_HEAD(&ci->i_cap_delay_list);
480 INIT_LIST_HEAD(&ci->i_cap_snaps);
481 ci->i_head_snapc = NULL;
482 ci->i_snap_caps = 0;
483
484 ci->i_last_rd = ci->i_last_wr = jiffies - 3600 * HZ;
485 for (i = 0; i < CEPH_FILE_MODE_BITS; i++)
486 ci->i_nr_by_mode[i] = 0;
487
488 mutex_init(&ci->i_truncate_mutex);
489 ci->i_truncate_seq = 0;
490 ci->i_truncate_size = 0;
491 ci->i_truncate_pending = 0;
492
493 ci->i_max_size = 0;
494 ci->i_reported_size = 0;
495 ci->i_wanted_max_size = 0;
496 ci->i_requested_max_size = 0;
497
498 ci->i_pin_ref = 0;
499 ci->i_rd_ref = 0;
500 ci->i_rdcache_ref = 0;
501 ci->i_wr_ref = 0;
502 ci->i_wb_ref = 0;
503 ci->i_fx_ref = 0;
504 ci->i_wrbuffer_ref = 0;
505 ci->i_wrbuffer_ref_head = 0;
506 atomic_set(&ci->i_filelock_ref, 0);
507 atomic_set(&ci->i_shared_gen, 1);
508 ci->i_rdcache_gen = 0;
509 ci->i_rdcache_revoking = 0;
510
511 INIT_LIST_HEAD(&ci->i_unsafe_dirops);
512 INIT_LIST_HEAD(&ci->i_unsafe_iops);
513 spin_lock_init(&ci->i_unsafe_lock);
514
515 ci->i_snap_realm = NULL;
516 INIT_LIST_HEAD(&ci->i_snap_realm_item);
517 INIT_LIST_HEAD(&ci->i_snap_flush_item);
518
519 INIT_WORK(&ci->i_work, ceph_inode_work);
520 ci->i_work_mask = 0;
521 memset(&ci->i_btime, '\0', sizeof(ci->i_btime));
522
523 ceph_fscache_inode_init(ci);
524
525 ci->i_meta_err = 0;
526
527 return &ci->vfs_inode;
528}
529
530void ceph_free_inode(struct inode *inode)
531{
532 struct ceph_inode_info *ci = ceph_inode(inode);
533
534 kfree(ci->i_symlink);
535 kmem_cache_free(ceph_inode_cachep, ci);
536}
537
538void ceph_evict_inode(struct inode *inode)
539{
540 struct ceph_inode_info *ci = ceph_inode(inode);
541 struct ceph_inode_frag *frag;
542 struct rb_node *n;
543
544 dout("evict_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
545
546 truncate_inode_pages_final(&inode->i_data);
547 clear_inode(inode);
548
549 ceph_fscache_unregister_inode_cookie(ci);
550
551 __ceph_remove_caps(ci);
552
553 if (__ceph_has_any_quota(ci))
554 ceph_adjust_quota_realms_count(inode, false);
555
556 /*
557 * we may still have a snap_realm reference if there are stray
558 * caps in i_snap_caps.
559 */
560 if (ci->i_snap_realm) {
561 struct ceph_mds_client *mdsc =
562 ceph_inode_to_client(inode)->mdsc;
563 if (ceph_snap(inode) == CEPH_NOSNAP) {
564 struct ceph_snap_realm *realm = ci->i_snap_realm;
565 dout(" dropping residual ref to snap realm %p\n",
566 realm);
567 spin_lock(&realm->inodes_with_caps_lock);
568 list_del_init(&ci->i_snap_realm_item);
569 ci->i_snap_realm = NULL;
570 if (realm->ino == ci->i_vino.ino)
571 realm->inode = NULL;
572 spin_unlock(&realm->inodes_with_caps_lock);
573 ceph_put_snap_realm(mdsc, realm);
574 } else {
575 ceph_put_snapid_map(mdsc, ci->i_snapid_map);
576 ci->i_snap_realm = NULL;
577 }
578 }
579
580 while ((n = rb_first(&ci->i_fragtree)) != NULL) {
581 frag = rb_entry(n, struct ceph_inode_frag, node);
582 rb_erase(n, &ci->i_fragtree);
583 kfree(frag);
584 }
585 ci->i_fragtree_nsplits = 0;
586
587 __ceph_destroy_xattrs(ci);
588 if (ci->i_xattrs.blob)
589 ceph_buffer_put(ci->i_xattrs.blob);
590 if (ci->i_xattrs.prealloc_blob)
591 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
592
593 ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns));
594 ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
595}
596
597static inline blkcnt_t calc_inode_blocks(u64 size)
598{
599 return (size + (1<<9) - 1) >> 9;
600}
601
602/*
603 * Helpers to fill in size, ctime, mtime, and atime. We have to be
604 * careful because either the client or MDS may have more up to date
605 * info, depending on which capabilities are held, and whether
606 * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime
607 * and size are monotonically increasing, except when utimes() or
608 * truncate() increments the corresponding _seq values.)
609 */
610int ceph_fill_file_size(struct inode *inode, int issued,
611 u32 truncate_seq, u64 truncate_size, u64 size)
612{
613 struct ceph_inode_info *ci = ceph_inode(inode);
614 int queue_trunc = 0;
615
616 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
617 (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
618 dout("size %lld -> %llu\n", inode->i_size, size);
619 if (size > 0 && S_ISDIR(inode->i_mode)) {
620 pr_err("fill_file_size non-zero size for directory\n");
621 size = 0;
622 }
623 i_size_write(inode, size);
624 inode->i_blocks = calc_inode_blocks(size);
625 ci->i_reported_size = size;
626 if (truncate_seq != ci->i_truncate_seq) {
627 dout("truncate_seq %u -> %u\n",
628 ci->i_truncate_seq, truncate_seq);
629 ci->i_truncate_seq = truncate_seq;
630
631 /* the MDS should have revoked these caps */
632 WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
633 CEPH_CAP_FILE_RD |
634 CEPH_CAP_FILE_WR |
635 CEPH_CAP_FILE_LAZYIO));
636 /*
637 * If we hold relevant caps, or in the case where we're
638 * not the only client referencing this file and we
639 * don't hold those caps, then we need to check whether
640 * the file is either opened or mmaped
641 */
642 if ((issued & (CEPH_CAP_FILE_CACHE|
643 CEPH_CAP_FILE_BUFFER)) ||
644 mapping_mapped(inode->i_mapping) ||
645 __ceph_is_file_opened(ci)) {
646 ci->i_truncate_pending++;
647 queue_trunc = 1;
648 }
649 }
650 }
651 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
652 ci->i_truncate_size != truncate_size) {
653 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
654 truncate_size);
655 ci->i_truncate_size = truncate_size;
656 }
657
658 if (queue_trunc)
659 ceph_fscache_invalidate(inode);
660
661 return queue_trunc;
662}
663
664void ceph_fill_file_time(struct inode *inode, int issued,
665 u64 time_warp_seq, struct timespec64 *ctime,
666 struct timespec64 *mtime, struct timespec64 *atime)
667{
668 struct ceph_inode_info *ci = ceph_inode(inode);
669 int warn = 0;
670
671 if (issued & (CEPH_CAP_FILE_EXCL|
672 CEPH_CAP_FILE_WR|
673 CEPH_CAP_FILE_BUFFER|
674 CEPH_CAP_AUTH_EXCL|
675 CEPH_CAP_XATTR_EXCL)) {
676 if (ci->i_version == 0 ||
677 timespec64_compare(ctime, &inode->i_ctime) > 0) {
678 dout("ctime %lld.%09ld -> %lld.%09ld inc w/ cap\n",
679 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
680 ctime->tv_sec, ctime->tv_nsec);
681 inode->i_ctime = *ctime;
682 }
683 if (ci->i_version == 0 ||
684 ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
685 /* the MDS did a utimes() */
686 dout("mtime %lld.%09ld -> %lld.%09ld "
687 "tw %d -> %d\n",
688 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
689 mtime->tv_sec, mtime->tv_nsec,
690 ci->i_time_warp_seq, (int)time_warp_seq);
691
692 inode->i_mtime = *mtime;
693 inode->i_atime = *atime;
694 ci->i_time_warp_seq = time_warp_seq;
695 } else if (time_warp_seq == ci->i_time_warp_seq) {
696 /* nobody did utimes(); take the max */
697 if (timespec64_compare(mtime, &inode->i_mtime) > 0) {
698 dout("mtime %lld.%09ld -> %lld.%09ld inc\n",
699 inode->i_mtime.tv_sec,
700 inode->i_mtime.tv_nsec,
701 mtime->tv_sec, mtime->tv_nsec);
702 inode->i_mtime = *mtime;
703 }
704 if (timespec64_compare(atime, &inode->i_atime) > 0) {
705 dout("atime %lld.%09ld -> %lld.%09ld inc\n",
706 inode->i_atime.tv_sec,
707 inode->i_atime.tv_nsec,
708 atime->tv_sec, atime->tv_nsec);
709 inode->i_atime = *atime;
710 }
711 } else if (issued & CEPH_CAP_FILE_EXCL) {
712 /* we did a utimes(); ignore mds values */
713 } else {
714 warn = 1;
715 }
716 } else {
717 /* we have no write|excl caps; whatever the MDS says is true */
718 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
719 inode->i_ctime = *ctime;
720 inode->i_mtime = *mtime;
721 inode->i_atime = *atime;
722 ci->i_time_warp_seq = time_warp_seq;
723 } else {
724 warn = 1;
725 }
726 }
727 if (warn) /* time_warp_seq shouldn't go backwards */
728 dout("%p mds time_warp_seq %llu < %u\n",
729 inode, time_warp_seq, ci->i_time_warp_seq);
730}
731
732/*
733 * Populate an inode based on info from mds. May be called on new or
734 * existing inodes.
735 */
736int ceph_fill_inode(struct inode *inode, struct page *locked_page,
737 struct ceph_mds_reply_info_in *iinfo,
738 struct ceph_mds_reply_dirfrag *dirinfo,
739 struct ceph_mds_session *session, int cap_fmode,
740 struct ceph_cap_reservation *caps_reservation)
741{
742 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
743 struct ceph_mds_reply_inode *info = iinfo->in;
744 struct ceph_inode_info *ci = ceph_inode(inode);
745 int issued, new_issued, info_caps;
746 struct timespec64 mtime, atime, ctime;
747 struct ceph_buffer *xattr_blob = NULL;
748 struct ceph_buffer *old_blob = NULL;
749 struct ceph_string *pool_ns = NULL;
750 struct ceph_cap *new_cap = NULL;
751 int err = 0;
752 bool wake = false;
753 bool queue_trunc = false;
754 bool new_version = false;
755 bool fill_inline = false;
756
757 dout("%s %p ino %llx.%llx v %llu had %llu\n", __func__,
758 inode, ceph_vinop(inode), le64_to_cpu(info->version),
759 ci->i_version);
760
761 info_caps = le32_to_cpu(info->cap.caps);
762
763 /* prealloc new cap struct */
764 if (info_caps && ceph_snap(inode) == CEPH_NOSNAP) {
765 new_cap = ceph_get_cap(mdsc, caps_reservation);
766 if (!new_cap)
767 return -ENOMEM;
768 }
769
770 /*
771 * prealloc xattr data, if it looks like we'll need it. only
772 * if len > 4 (meaning there are actually xattrs; the first 4
773 * bytes are the xattr count).
774 */
775 if (iinfo->xattr_len > 4) {
776 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
777 if (!xattr_blob)
778 pr_err("%s ENOMEM xattr blob %d bytes\n", __func__,
779 iinfo->xattr_len);
780 }
781
782 if (iinfo->pool_ns_len > 0)
783 pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data,
784 iinfo->pool_ns_len);
785
786 if (ceph_snap(inode) != CEPH_NOSNAP && !ci->i_snapid_map)
787 ci->i_snapid_map = ceph_get_snapid_map(mdsc, ceph_snap(inode));
788
789 spin_lock(&ci->i_ceph_lock);
790
791 /*
792 * provided version will be odd if inode value is projected,
793 * even if stable. skip the update if we have newer stable
794 * info (ours>=theirs, e.g. due to racing mds replies), unless
795 * we are getting projected (unstable) info (in which case the
796 * version is odd, and we want ours>theirs).
797 * us them
798 * 2 2 skip
799 * 3 2 skip
800 * 3 3 update
801 */
802 if (ci->i_version == 0 ||
803 ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
804 le64_to_cpu(info->version) > (ci->i_version & ~1)))
805 new_version = true;
806
807 /* Update change_attribute */
808 inode_set_max_iversion_raw(inode, iinfo->change_attr);
809
810 __ceph_caps_issued(ci, &issued);
811 issued |= __ceph_caps_dirty(ci);
812 new_issued = ~issued & info_caps;
813
814 /* update inode */
815 inode->i_rdev = le32_to_cpu(info->rdev);
816 /* directories have fl_stripe_unit set to zero */
817 if (le32_to_cpu(info->layout.fl_stripe_unit))
818 inode->i_blkbits =
819 fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
820 else
821 inode->i_blkbits = CEPH_BLOCK_SHIFT;
822
823 __ceph_update_quota(ci, iinfo->max_bytes, iinfo->max_files);
824
825 if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
826 (issued & CEPH_CAP_AUTH_EXCL) == 0) {
827 inode->i_mode = le32_to_cpu(info->mode);
828 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
829 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
830 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
831 from_kuid(&init_user_ns, inode->i_uid),
832 from_kgid(&init_user_ns, inode->i_gid));
833 ceph_decode_timespec64(&ci->i_btime, &iinfo->btime);
834 ceph_decode_timespec64(&ci->i_snap_btime, &iinfo->snap_btime);
835 }
836
837 if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
838 (issued & CEPH_CAP_LINK_EXCL) == 0)
839 set_nlink(inode, le32_to_cpu(info->nlink));
840
841 if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
842 /* be careful with mtime, atime, size */
843 ceph_decode_timespec64(&atime, &info->atime);
844 ceph_decode_timespec64(&mtime, &info->mtime);
845 ceph_decode_timespec64(&ctime, &info->ctime);
846 ceph_fill_file_time(inode, issued,
847 le32_to_cpu(info->time_warp_seq),
848 &ctime, &mtime, &atime);
849 }
850
851 if (new_version || (info_caps & CEPH_CAP_FILE_SHARED)) {
852 ci->i_files = le64_to_cpu(info->files);
853 ci->i_subdirs = le64_to_cpu(info->subdirs);
854 }
855
856 if (new_version ||
857 (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
858 s64 old_pool = ci->i_layout.pool_id;
859 struct ceph_string *old_ns;
860
861 ceph_file_layout_from_legacy(&ci->i_layout, &info->layout);
862 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
863 lockdep_is_held(&ci->i_ceph_lock));
864 rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns);
865
866 if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns)
867 ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
868
869 pool_ns = old_ns;
870
871 queue_trunc = ceph_fill_file_size(inode, issued,
872 le32_to_cpu(info->truncate_seq),
873 le64_to_cpu(info->truncate_size),
874 le64_to_cpu(info->size));
875 /* only update max_size on auth cap */
876 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
877 ci->i_max_size != le64_to_cpu(info->max_size)) {
878 dout("max_size %lld -> %llu\n", ci->i_max_size,
879 le64_to_cpu(info->max_size));
880 ci->i_max_size = le64_to_cpu(info->max_size);
881 }
882 }
883
884 /* layout and rstat are not tracked by capability, update them if
885 * the inode info is from auth mds */
886 if (new_version || (info->cap.flags & CEPH_CAP_FLAG_AUTH)) {
887 if (S_ISDIR(inode->i_mode)) {
888 ci->i_dir_layout = iinfo->dir_layout;
889 ci->i_rbytes = le64_to_cpu(info->rbytes);
890 ci->i_rfiles = le64_to_cpu(info->rfiles);
891 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
892 ci->i_dir_pin = iinfo->dir_pin;
893 ceph_decode_timespec64(&ci->i_rctime, &info->rctime);
894 }
895 }
896
897 /* xattrs */
898 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
899 if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL)) &&
900 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
901 if (ci->i_xattrs.blob)
902 old_blob = ci->i_xattrs.blob;
903 ci->i_xattrs.blob = xattr_blob;
904 if (xattr_blob)
905 memcpy(ci->i_xattrs.blob->vec.iov_base,
906 iinfo->xattr_data, iinfo->xattr_len);
907 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
908 ceph_forget_all_cached_acls(inode);
909 ceph_security_invalidate_secctx(inode);
910 xattr_blob = NULL;
911 }
912
913 /* finally update i_version */
914 if (le64_to_cpu(info->version) > ci->i_version)
915 ci->i_version = le64_to_cpu(info->version);
916
917 inode->i_mapping->a_ops = &ceph_aops;
918
919 switch (inode->i_mode & S_IFMT) {
920 case S_IFIFO:
921 case S_IFBLK:
922 case S_IFCHR:
923 case S_IFSOCK:
924 inode->i_blkbits = PAGE_SHIFT;
925 init_special_inode(inode, inode->i_mode, inode->i_rdev);
926 inode->i_op = &ceph_file_iops;
927 break;
928 case S_IFREG:
929 inode->i_op = &ceph_file_iops;
930 inode->i_fop = &ceph_file_fops;
931 break;
932 case S_IFLNK:
933 inode->i_op = &ceph_symlink_iops;
934 if (!ci->i_symlink) {
935 u32 symlen = iinfo->symlink_len;
936 char *sym;
937
938 spin_unlock(&ci->i_ceph_lock);
939
940 if (symlen != i_size_read(inode)) {
941 pr_err("%s %llx.%llx BAD symlink "
942 "size %lld\n", __func__,
943 ceph_vinop(inode),
944 i_size_read(inode));
945 i_size_write(inode, symlen);
946 inode->i_blocks = calc_inode_blocks(symlen);
947 }
948
949 err = -ENOMEM;
950 sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
951 if (!sym)
952 goto out;
953
954 spin_lock(&ci->i_ceph_lock);
955 if (!ci->i_symlink)
956 ci->i_symlink = sym;
957 else
958 kfree(sym); /* lost a race */
959 }
960 inode->i_link = ci->i_symlink;
961 break;
962 case S_IFDIR:
963 inode->i_op = &ceph_dir_iops;
964 inode->i_fop = &ceph_dir_fops;
965 break;
966 default:
967 pr_err("%s %llx.%llx BAD mode 0%o\n", __func__,
968 ceph_vinop(inode), inode->i_mode);
969 }
970
971 /* were we issued a capability? */
972 if (info_caps) {
973 if (ceph_snap(inode) == CEPH_NOSNAP) {
974 ceph_add_cap(inode, session,
975 le64_to_cpu(info->cap.cap_id),
976 info_caps,
977 le32_to_cpu(info->cap.wanted),
978 le32_to_cpu(info->cap.seq),
979 le32_to_cpu(info->cap.mseq),
980 le64_to_cpu(info->cap.realm),
981 info->cap.flags, &new_cap);
982
983 /* set dir completion flag? */
984 if (S_ISDIR(inode->i_mode) &&
985 ci->i_files == 0 && ci->i_subdirs == 0 &&
986 (info_caps & CEPH_CAP_FILE_SHARED) &&
987 (issued & CEPH_CAP_FILE_EXCL) == 0 &&
988 !__ceph_dir_is_complete(ci)) {
989 dout(" marking %p complete (empty)\n", inode);
990 i_size_write(inode, 0);
991 __ceph_dir_set_complete(ci,
992 atomic64_read(&ci->i_release_count),
993 atomic64_read(&ci->i_ordered_count));
994 }
995
996 wake = true;
997 } else {
998 dout(" %p got snap_caps %s\n", inode,
999 ceph_cap_string(info_caps));
1000 ci->i_snap_caps |= info_caps;
1001 }
1002 }
1003
1004 if (iinfo->inline_version > 0 &&
1005 iinfo->inline_version >= ci->i_inline_version) {
1006 int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1007 ci->i_inline_version = iinfo->inline_version;
1008 if (ci->i_inline_version != CEPH_INLINE_NONE &&
1009 (locked_page || (info_caps & cache_caps)))
1010 fill_inline = true;
1011 }
1012
1013 if (cap_fmode >= 0) {
1014 if (!info_caps)
1015 pr_warn("mds issued no caps on %llx.%llx\n",
1016 ceph_vinop(inode));
1017 __ceph_touch_fmode(ci, mdsc, cap_fmode);
1018 }
1019
1020 spin_unlock(&ci->i_ceph_lock);
1021
1022 if (fill_inline)
1023 ceph_fill_inline_data(inode, locked_page,
1024 iinfo->inline_data, iinfo->inline_len);
1025
1026 if (wake)
1027 wake_up_all(&ci->i_cap_wq);
1028
1029 /* queue truncate if we saw i_size decrease */
1030 if (queue_trunc)
1031 ceph_queue_vmtruncate(inode);
1032
1033 /* populate frag tree */
1034 if (S_ISDIR(inode->i_mode))
1035 ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
1036
1037 /* update delegation info? */
1038 if (dirinfo)
1039 ceph_fill_dirfrag(inode, dirinfo);
1040
1041 err = 0;
1042out:
1043 if (new_cap)
1044 ceph_put_cap(mdsc, new_cap);
1045 ceph_buffer_put(old_blob);
1046 ceph_buffer_put(xattr_blob);
1047 ceph_put_string(pool_ns);
1048 return err;
1049}
1050
1051/*
1052 * caller should hold session s_mutex and dentry->d_lock.
1053 */
1054static void __update_dentry_lease(struct inode *dir, struct dentry *dentry,
1055 struct ceph_mds_reply_lease *lease,
1056 struct ceph_mds_session *session,
1057 unsigned long from_time,
1058 struct ceph_mds_session **old_lease_session)
1059{
1060 struct ceph_dentry_info *di = ceph_dentry(dentry);
1061 unsigned mask = le16_to_cpu(lease->mask);
1062 long unsigned duration = le32_to_cpu(lease->duration_ms);
1063 long unsigned ttl = from_time + (duration * HZ) / 1000;
1064 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
1065
1066 dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
1067 dentry, duration, ttl);
1068
1069 /* only track leases on regular dentries */
1070 if (ceph_snap(dir) != CEPH_NOSNAP)
1071 return;
1072
1073 if (mask & CEPH_LEASE_PRIMARY_LINK)
1074 di->flags |= CEPH_DENTRY_PRIMARY_LINK;
1075 else
1076 di->flags &= ~CEPH_DENTRY_PRIMARY_LINK;
1077
1078 di->lease_shared_gen = atomic_read(&ceph_inode(dir)->i_shared_gen);
1079 if (!(mask & CEPH_LEASE_VALID)) {
1080 __ceph_dentry_dir_lease_touch(di);
1081 return;
1082 }
1083
1084 if (di->lease_gen == session->s_cap_gen &&
1085 time_before(ttl, di->time))
1086 return; /* we already have a newer lease. */
1087
1088 if (di->lease_session && di->lease_session != session) {
1089 *old_lease_session = di->lease_session;
1090 di->lease_session = NULL;
1091 }
1092
1093 if (!di->lease_session)
1094 di->lease_session = ceph_get_mds_session(session);
1095 di->lease_gen = session->s_cap_gen;
1096 di->lease_seq = le32_to_cpu(lease->seq);
1097 di->lease_renew_after = half_ttl;
1098 di->lease_renew_from = 0;
1099 di->time = ttl;
1100
1101 __ceph_dentry_lease_touch(di);
1102}
1103
1104static inline void update_dentry_lease(struct inode *dir, struct dentry *dentry,
1105 struct ceph_mds_reply_lease *lease,
1106 struct ceph_mds_session *session,
1107 unsigned long from_time)
1108{
1109 struct ceph_mds_session *old_lease_session = NULL;
1110 spin_lock(&dentry->d_lock);
1111 __update_dentry_lease(dir, dentry, lease, session, from_time,
1112 &old_lease_session);
1113 spin_unlock(&dentry->d_lock);
1114 if (old_lease_session)
1115 ceph_put_mds_session(old_lease_session);
1116}
1117
1118/*
1119 * update dentry lease without having parent inode locked
1120 */
1121static void update_dentry_lease_careful(struct dentry *dentry,
1122 struct ceph_mds_reply_lease *lease,
1123 struct ceph_mds_session *session,
1124 unsigned long from_time,
1125 char *dname, u32 dname_len,
1126 struct ceph_vino *pdvino,
1127 struct ceph_vino *ptvino)
1128
1129{
1130 struct inode *dir;
1131 struct ceph_mds_session *old_lease_session = NULL;
1132
1133 spin_lock(&dentry->d_lock);
1134 /* make sure dentry's name matches target */
1135 if (dentry->d_name.len != dname_len ||
1136 memcmp(dentry->d_name.name, dname, dname_len))
1137 goto out_unlock;
1138
1139 dir = d_inode(dentry->d_parent);
1140 /* make sure parent matches dvino */
1141 if (!ceph_ino_compare(dir, pdvino))
1142 goto out_unlock;
1143
1144 /* make sure dentry's inode matches target. NULL ptvino means that
1145 * we expect a negative dentry */
1146 if (ptvino) {
1147 if (d_really_is_negative(dentry))
1148 goto out_unlock;
1149 if (!ceph_ino_compare(d_inode(dentry), ptvino))
1150 goto out_unlock;
1151 } else {
1152 if (d_really_is_positive(dentry))
1153 goto out_unlock;
1154 }
1155
1156 __update_dentry_lease(dir, dentry, lease, session,
1157 from_time, &old_lease_session);
1158out_unlock:
1159 spin_unlock(&dentry->d_lock);
1160 if (old_lease_session)
1161 ceph_put_mds_session(old_lease_session);
1162}
1163
1164/*
1165 * splice a dentry to an inode.
1166 * caller must hold directory i_mutex for this to be safe.
1167 */
1168static int splice_dentry(struct dentry **pdn, struct inode *in)
1169{
1170 struct dentry *dn = *pdn;
1171 struct dentry *realdn;
1172
1173 BUG_ON(d_inode(dn));
1174
1175 if (S_ISDIR(in->i_mode)) {
1176 /* If inode is directory, d_splice_alias() below will remove
1177 * 'realdn' from its origin parent. We need to ensure that
1178 * origin parent's readdir cache will not reference 'realdn'
1179 */
1180 realdn = d_find_any_alias(in);
1181 if (realdn) {
1182 struct ceph_dentry_info *di = ceph_dentry(realdn);
1183 spin_lock(&realdn->d_lock);
1184
1185 realdn->d_op->d_prune(realdn);
1186
1187 di->time = jiffies;
1188 di->lease_shared_gen = 0;
1189 di->offset = 0;
1190
1191 spin_unlock(&realdn->d_lock);
1192 dput(realdn);
1193 }
1194 }
1195
1196 /* dn must be unhashed */
1197 if (!d_unhashed(dn))
1198 d_drop(dn);
1199 realdn = d_splice_alias(in, dn);
1200 if (IS_ERR(realdn)) {
1201 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
1202 PTR_ERR(realdn), dn, in, ceph_vinop(in));
1203 return PTR_ERR(realdn);
1204 }
1205
1206 if (realdn) {
1207 dout("dn %p (%d) spliced with %p (%d) "
1208 "inode %p ino %llx.%llx\n",
1209 dn, d_count(dn),
1210 realdn, d_count(realdn),
1211 d_inode(realdn), ceph_vinop(d_inode(realdn)));
1212 dput(dn);
1213 *pdn = realdn;
1214 } else {
1215 BUG_ON(!ceph_dentry(dn));
1216 dout("dn %p attached to %p ino %llx.%llx\n",
1217 dn, d_inode(dn), ceph_vinop(d_inode(dn)));
1218 }
1219 return 0;
1220}
1221
1222/*
1223 * Incorporate results into the local cache. This is either just
1224 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1225 * after a lookup).
1226 *
1227 * A reply may contain
1228 * a directory inode along with a dentry.
1229 * and/or a target inode
1230 *
1231 * Called with snap_rwsem (read).
1232 */
1233int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
1234{
1235 struct ceph_mds_session *session = req->r_session;
1236 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1237 struct inode *in = NULL;
1238 struct ceph_vino tvino, dvino;
1239 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1240 int err = 0;
1241
1242 dout("fill_trace %p is_dentry %d is_target %d\n", req,
1243 rinfo->head->is_dentry, rinfo->head->is_target);
1244
1245 if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1246 dout("fill_trace reply is empty!\n");
1247 if (rinfo->head->result == 0 && req->r_parent)
1248 ceph_invalidate_dir_request(req);
1249 return 0;
1250 }
1251
1252 if (rinfo->head->is_dentry) {
1253 struct inode *dir = req->r_parent;
1254
1255 if (dir) {
1256 err = ceph_fill_inode(dir, NULL, &rinfo->diri,
1257 rinfo->dirfrag, session, -1,
1258 &req->r_caps_reservation);
1259 if (err < 0)
1260 goto done;
1261 } else {
1262 WARN_ON_ONCE(1);
1263 }
1264
1265 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME &&
1266 test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1267 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1268 struct qstr dname;
1269 struct dentry *dn, *parent;
1270
1271 BUG_ON(!rinfo->head->is_target);
1272 BUG_ON(req->r_dentry);
1273
1274 parent = d_find_any_alias(dir);
1275 BUG_ON(!parent);
1276
1277 dname.name = rinfo->dname;
1278 dname.len = rinfo->dname_len;
1279 dname.hash = full_name_hash(parent, dname.name, dname.len);
1280 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1281 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1282retry_lookup:
1283 dn = d_lookup(parent, &dname);
1284 dout("d_lookup on parent=%p name=%.*s got %p\n",
1285 parent, dname.len, dname.name, dn);
1286
1287 if (!dn) {
1288 dn = d_alloc(parent, &dname);
1289 dout("d_alloc %p '%.*s' = %p\n", parent,
1290 dname.len, dname.name, dn);
1291 if (!dn) {
1292 dput(parent);
1293 err = -ENOMEM;
1294 goto done;
1295 }
1296 err = 0;
1297 } else if (d_really_is_positive(dn) &&
1298 (ceph_ino(d_inode(dn)) != tvino.ino ||
1299 ceph_snap(d_inode(dn)) != tvino.snap)) {
1300 dout(" dn %p points to wrong inode %p\n",
1301 dn, d_inode(dn));
1302 ceph_dir_clear_ordered(dir);
1303 d_delete(dn);
1304 dput(dn);
1305 goto retry_lookup;
1306 }
1307
1308 req->r_dentry = dn;
1309 dput(parent);
1310 }
1311 }
1312
1313 if (rinfo->head->is_target) {
1314 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1315 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1316
1317 in = ceph_get_inode(sb, tvino);
1318 if (IS_ERR(in)) {
1319 err = PTR_ERR(in);
1320 goto done;
1321 }
1322
1323 err = ceph_fill_inode(in, req->r_locked_page, &rinfo->targeti,
1324 NULL, session,
1325 (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1326 !test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) &&
1327 rinfo->head->result == 0) ? req->r_fmode : -1,
1328 &req->r_caps_reservation);
1329 if (err < 0) {
1330 pr_err("ceph_fill_inode badness %p %llx.%llx\n",
1331 in, ceph_vinop(in));
1332 if (in->i_state & I_NEW)
1333 discard_new_inode(in);
1334 goto done;
1335 }
1336 req->r_target_inode = in;
1337 if (in->i_state & I_NEW)
1338 unlock_new_inode(in);
1339 }
1340
1341 /*
1342 * ignore null lease/binding on snapdir ENOENT, or else we
1343 * will have trouble splicing in the virtual snapdir later
1344 */
1345 if (rinfo->head->is_dentry &&
1346 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1347 test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1348 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1349 fsc->mount_options->snapdir_name,
1350 req->r_dentry->d_name.len))) {
1351 /*
1352 * lookup link rename : null -> possibly existing inode
1353 * mknod symlink mkdir : null -> new inode
1354 * unlink : linked -> null
1355 */
1356 struct inode *dir = req->r_parent;
1357 struct dentry *dn = req->r_dentry;
1358 bool have_dir_cap, have_lease;
1359
1360 BUG_ON(!dn);
1361 BUG_ON(!dir);
1362 BUG_ON(d_inode(dn->d_parent) != dir);
1363
1364 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1365 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1366
1367 BUG_ON(ceph_ino(dir) != dvino.ino);
1368 BUG_ON(ceph_snap(dir) != dvino.snap);
1369
1370 /* do we have a lease on the whole dir? */
1371 have_dir_cap =
1372 (le32_to_cpu(rinfo->diri.in->cap.caps) &
1373 CEPH_CAP_FILE_SHARED);
1374
1375 /* do we have a dn lease? */
1376 have_lease = have_dir_cap ||
1377 le32_to_cpu(rinfo->dlease->duration_ms);
1378 if (!have_lease)
1379 dout("fill_trace no dentry lease or dir cap\n");
1380
1381 /* rename? */
1382 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1383 struct inode *olddir = req->r_old_dentry_dir;
1384 BUG_ON(!olddir);
1385
1386 dout(" src %p '%pd' dst %p '%pd'\n",
1387 req->r_old_dentry,
1388 req->r_old_dentry,
1389 dn, dn);
1390 dout("fill_trace doing d_move %p -> %p\n",
1391 req->r_old_dentry, dn);
1392
1393 /* d_move screws up sibling dentries' offsets */
1394 ceph_dir_clear_ordered(dir);
1395 ceph_dir_clear_ordered(olddir);
1396
1397 d_move(req->r_old_dentry, dn);
1398 dout(" src %p '%pd' dst %p '%pd'\n",
1399 req->r_old_dentry,
1400 req->r_old_dentry,
1401 dn, dn);
1402
1403 /* ensure target dentry is invalidated, despite
1404 rehashing bug in vfs_rename_dir */
1405 ceph_invalidate_dentry_lease(dn);
1406
1407 dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1408 ceph_dentry(req->r_old_dentry)->offset);
1409
1410 /* swap r_dentry and r_old_dentry in case that
1411 * splice_dentry() gets called later. This is safe
1412 * because no other place will use them */
1413 req->r_dentry = req->r_old_dentry;
1414 req->r_old_dentry = dn;
1415 dn = req->r_dentry;
1416 }
1417
1418 /* null dentry? */
1419 if (!rinfo->head->is_target) {
1420 dout("fill_trace null dentry\n");
1421 if (d_really_is_positive(dn)) {
1422 dout("d_delete %p\n", dn);
1423 ceph_dir_clear_ordered(dir);
1424 d_delete(dn);
1425 } else if (have_lease) {
1426 if (d_unhashed(dn))
1427 d_add(dn, NULL);
1428 update_dentry_lease(dir, dn,
1429 rinfo->dlease, session,
1430 req->r_request_started);
1431 }
1432 goto done;
1433 }
1434
1435 /* attach proper inode */
1436 if (d_really_is_negative(dn)) {
1437 ceph_dir_clear_ordered(dir);
1438 ihold(in);
1439 err = splice_dentry(&req->r_dentry, in);
1440 if (err < 0)
1441 goto done;
1442 dn = req->r_dentry; /* may have spliced */
1443 } else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1444 dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1445 dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1446 ceph_vinop(in));
1447 d_invalidate(dn);
1448 have_lease = false;
1449 }
1450
1451 if (have_lease) {
1452 update_dentry_lease(dir, dn,
1453 rinfo->dlease, session,
1454 req->r_request_started);
1455 }
1456 dout(" final dn %p\n", dn);
1457 } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1458 req->r_op == CEPH_MDS_OP_MKSNAP) &&
1459 test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1460 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1461 struct inode *dir = req->r_parent;
1462
1463 /* fill out a snapdir LOOKUPSNAP dentry */
1464 BUG_ON(!dir);
1465 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1466 BUG_ON(!req->r_dentry);
1467 dout(" linking snapped dir %p to dn %p\n", in, req->r_dentry);
1468 ceph_dir_clear_ordered(dir);
1469 ihold(in);
1470 err = splice_dentry(&req->r_dentry, in);
1471 if (err < 0)
1472 goto done;
1473 } else if (rinfo->head->is_dentry && req->r_dentry) {
1474 /* parent inode is not locked, be carefull */
1475 struct ceph_vino *ptvino = NULL;
1476 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1477 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1478 if (rinfo->head->is_target) {
1479 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1480 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1481 ptvino = &tvino;
1482 }
1483 update_dentry_lease_careful(req->r_dentry, rinfo->dlease,
1484 session, req->r_request_started,
1485 rinfo->dname, rinfo->dname_len,
1486 &dvino, ptvino);
1487 }
1488done:
1489 dout("fill_trace done err=%d\n", err);
1490 return err;
1491}
1492
1493/*
1494 * Prepopulate our cache with readdir results, leases, etc.
1495 */
1496static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1497 struct ceph_mds_session *session)
1498{
1499 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1500 int i, err = 0;
1501
1502 for (i = 0; i < rinfo->dir_nr; i++) {
1503 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1504 struct ceph_vino vino;
1505 struct inode *in;
1506 int rc;
1507
1508 vino.ino = le64_to_cpu(rde->inode.in->ino);
1509 vino.snap = le64_to_cpu(rde->inode.in->snapid);
1510
1511 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1512 if (IS_ERR(in)) {
1513 err = PTR_ERR(in);
1514 dout("new_inode badness got %d\n", err);
1515 continue;
1516 }
1517 rc = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
1518 -1, &req->r_caps_reservation);
1519 if (rc < 0) {
1520 pr_err("ceph_fill_inode badness on %p got %d\n",
1521 in, rc);
1522 err = rc;
1523 if (in->i_state & I_NEW) {
1524 ihold(in);
1525 discard_new_inode(in);
1526 }
1527 } else if (in->i_state & I_NEW) {
1528 unlock_new_inode(in);
1529 }
1530
1531 /* avoid calling iput_final() in mds dispatch threads */
1532 ceph_async_iput(in);
1533 }
1534
1535 return err;
1536}
1537
1538void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1539{
1540 if (ctl->page) {
1541 kunmap(ctl->page);
1542 put_page(ctl->page);
1543 ctl->page = NULL;
1544 }
1545}
1546
1547static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1548 struct ceph_readdir_cache_control *ctl,
1549 struct ceph_mds_request *req)
1550{
1551 struct ceph_inode_info *ci = ceph_inode(dir);
1552 unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
1553 unsigned idx = ctl->index % nsize;
1554 pgoff_t pgoff = ctl->index / nsize;
1555
1556 if (!ctl->page || pgoff != page_index(ctl->page)) {
1557 ceph_readdir_cache_release(ctl);
1558 if (idx == 0)
1559 ctl->page = grab_cache_page(&dir->i_data, pgoff);
1560 else
1561 ctl->page = find_lock_page(&dir->i_data, pgoff);
1562 if (!ctl->page) {
1563 ctl->index = -1;
1564 return idx == 0 ? -ENOMEM : 0;
1565 }
1566 /* reading/filling the cache are serialized by
1567 * i_mutex, no need to use page lock */
1568 unlock_page(ctl->page);
1569 ctl->dentries = kmap(ctl->page);
1570 if (idx == 0)
1571 memset(ctl->dentries, 0, PAGE_SIZE);
1572 }
1573
1574 if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1575 req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1576 dout("readdir cache dn %p idx %d\n", dn, ctl->index);
1577 ctl->dentries[idx] = dn;
1578 ctl->index++;
1579 } else {
1580 dout("disable readdir cache\n");
1581 ctl->index = -1;
1582 }
1583 return 0;
1584}
1585
1586int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1587 struct ceph_mds_session *session)
1588{
1589 struct dentry *parent = req->r_dentry;
1590 struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
1591 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1592 struct qstr dname;
1593 struct dentry *dn;
1594 struct inode *in;
1595 int err = 0, skipped = 0, ret, i;
1596 struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1597 u32 frag = le32_to_cpu(rhead->args.readdir.frag);
1598 u32 last_hash = 0;
1599 u32 fpos_offset;
1600 struct ceph_readdir_cache_control cache_ctl = {};
1601
1602 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
1603 return readdir_prepopulate_inodes_only(req, session);
1604
1605 if (rinfo->hash_order) {
1606 if (req->r_path2) {
1607 last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1608 req->r_path2,
1609 strlen(req->r_path2));
1610 last_hash = ceph_frag_value(last_hash);
1611 } else if (rinfo->offset_hash) {
1612 /* mds understands offset_hash */
1613 WARN_ON_ONCE(req->r_readdir_offset != 2);
1614 last_hash = le32_to_cpu(rhead->args.readdir.offset_hash);
1615 }
1616 }
1617
1618 if (rinfo->dir_dir &&
1619 le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1620 dout("readdir_prepopulate got new frag %x -> %x\n",
1621 frag, le32_to_cpu(rinfo->dir_dir->frag));
1622 frag = le32_to_cpu(rinfo->dir_dir->frag);
1623 if (!rinfo->hash_order)
1624 req->r_readdir_offset = 2;
1625 }
1626
1627 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1628 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1629 rinfo->dir_nr, parent);
1630 } else {
1631 dout("readdir_prepopulate %d items under dn %p\n",
1632 rinfo->dir_nr, parent);
1633 if (rinfo->dir_dir)
1634 ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1635
1636 if (ceph_frag_is_leftmost(frag) &&
1637 req->r_readdir_offset == 2 &&
1638 !(rinfo->hash_order && last_hash)) {
1639 /* note dir version at start of readdir so we can
1640 * tell if any dentries get dropped */
1641 req->r_dir_release_cnt =
1642 atomic64_read(&ci->i_release_count);
1643 req->r_dir_ordered_cnt =
1644 atomic64_read(&ci->i_ordered_count);
1645 req->r_readdir_cache_idx = 0;
1646 }
1647 }
1648
1649 cache_ctl.index = req->r_readdir_cache_idx;
1650 fpos_offset = req->r_readdir_offset;
1651
1652 /* FIXME: release caps/leases if error occurs */
1653 for (i = 0; i < rinfo->dir_nr; i++) {
1654 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1655 struct ceph_vino tvino;
1656
1657 dname.name = rde->name;
1658 dname.len = rde->name_len;
1659 dname.hash = full_name_hash(parent, dname.name, dname.len);
1660
1661 tvino.ino = le64_to_cpu(rde->inode.in->ino);
1662 tvino.snap = le64_to_cpu(rde->inode.in->snapid);
1663
1664 if (rinfo->hash_order) {
1665 u32 hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1666 rde->name, rde->name_len);
1667 hash = ceph_frag_value(hash);
1668 if (hash != last_hash)
1669 fpos_offset = 2;
1670 last_hash = hash;
1671 rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
1672 } else {
1673 rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
1674 }
1675
1676retry_lookup:
1677 dn = d_lookup(parent, &dname);
1678 dout("d_lookup on parent=%p name=%.*s got %p\n",
1679 parent, dname.len, dname.name, dn);
1680
1681 if (!dn) {
1682 dn = d_alloc(parent, &dname);
1683 dout("d_alloc %p '%.*s' = %p\n", parent,
1684 dname.len, dname.name, dn);
1685 if (!dn) {
1686 dout("d_alloc badness\n");
1687 err = -ENOMEM;
1688 goto out;
1689 }
1690 } else if (d_really_is_positive(dn) &&
1691 (ceph_ino(d_inode(dn)) != tvino.ino ||
1692 ceph_snap(d_inode(dn)) != tvino.snap)) {
1693 struct ceph_dentry_info *di = ceph_dentry(dn);
1694 dout(" dn %p points to wrong inode %p\n",
1695 dn, d_inode(dn));
1696
1697 spin_lock(&dn->d_lock);
1698 if (di->offset > 0 &&
1699 di->lease_shared_gen ==
1700 atomic_read(&ci->i_shared_gen)) {
1701 __ceph_dir_clear_ordered(ci);
1702 di->offset = 0;
1703 }
1704 spin_unlock(&dn->d_lock);
1705
1706 d_delete(dn);
1707 dput(dn);
1708 goto retry_lookup;
1709 }
1710
1711 /* inode */
1712 if (d_really_is_positive(dn)) {
1713 in = d_inode(dn);
1714 } else {
1715 in = ceph_get_inode(parent->d_sb, tvino);
1716 if (IS_ERR(in)) {
1717 dout("new_inode badness\n");
1718 d_drop(dn);
1719 dput(dn);
1720 err = PTR_ERR(in);
1721 goto out;
1722 }
1723 }
1724
1725 ret = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
1726 -1, &req->r_caps_reservation);
1727 if (ret < 0) {
1728 pr_err("ceph_fill_inode badness on %p\n", in);
1729 if (d_really_is_negative(dn)) {
1730 /* avoid calling iput_final() in mds
1731 * dispatch threads */
1732 if (in->i_state & I_NEW) {
1733 ihold(in);
1734 discard_new_inode(in);
1735 }
1736 ceph_async_iput(in);
1737 }
1738 d_drop(dn);
1739 err = ret;
1740 goto next_item;
1741 }
1742 if (in->i_state & I_NEW)
1743 unlock_new_inode(in);
1744
1745 if (d_really_is_negative(dn)) {
1746 if (ceph_security_xattr_deadlock(in)) {
1747 dout(" skip splicing dn %p to inode %p"
1748 " (security xattr deadlock)\n", dn, in);
1749 ceph_async_iput(in);
1750 skipped++;
1751 goto next_item;
1752 }
1753
1754 err = splice_dentry(&dn, in);
1755 if (err < 0)
1756 goto next_item;
1757 }
1758
1759 ceph_dentry(dn)->offset = rde->offset;
1760
1761 update_dentry_lease(d_inode(parent), dn,
1762 rde->lease, req->r_session,
1763 req->r_request_started);
1764
1765 if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
1766 ret = fill_readdir_cache(d_inode(parent), dn,
1767 &cache_ctl, req);
1768 if (ret < 0)
1769 err = ret;
1770 }
1771next_item:
1772 dput(dn);
1773 }
1774out:
1775 if (err == 0 && skipped == 0) {
1776 set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
1777 req->r_readdir_cache_idx = cache_ctl.index;
1778 }
1779 ceph_readdir_cache_release(&cache_ctl);
1780 dout("readdir_prepopulate done\n");
1781 return err;
1782}
1783
1784bool ceph_inode_set_size(struct inode *inode, loff_t size)
1785{
1786 struct ceph_inode_info *ci = ceph_inode(inode);
1787 bool ret;
1788
1789 spin_lock(&ci->i_ceph_lock);
1790 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1791 i_size_write(inode, size);
1792 inode->i_blocks = calc_inode_blocks(size);
1793
1794 ret = __ceph_should_report_size(ci);
1795
1796 spin_unlock(&ci->i_ceph_lock);
1797 return ret;
1798}
1799
1800/*
1801 * Put reference to inode, but avoid calling iput_final() in current thread.
1802 * iput_final() may wait for reahahead pages. The wait can cause deadlock in
1803 * some contexts.
1804 */
1805void ceph_async_iput(struct inode *inode)
1806{
1807 if (!inode)
1808 return;
1809 for (;;) {
1810 if (atomic_add_unless(&inode->i_count, -1, 1))
1811 break;
1812 if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1813 &ceph_inode(inode)->i_work))
1814 break;
1815 /* queue work failed, i_count must be at least 2 */
1816 }
1817}
1818
1819/*
1820 * Write back inode data in a worker thread. (This can't be done
1821 * in the message handler context.)
1822 */
1823void ceph_queue_writeback(struct inode *inode)
1824{
1825 struct ceph_inode_info *ci = ceph_inode(inode);
1826 set_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask);
1827
1828 ihold(inode);
1829 if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1830 &ci->i_work)) {
1831 dout("ceph_queue_writeback %p\n", inode);
1832 } else {
1833 dout("ceph_queue_writeback %p already queued, mask=%lx\n",
1834 inode, ci->i_work_mask);
1835 iput(inode);
1836 }
1837}
1838
1839/*
1840 * queue an async invalidation
1841 */
1842void ceph_queue_invalidate(struct inode *inode)
1843{
1844 struct ceph_inode_info *ci = ceph_inode(inode);
1845 set_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask);
1846
1847 ihold(inode);
1848 if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1849 &ceph_inode(inode)->i_work)) {
1850 dout("ceph_queue_invalidate %p\n", inode);
1851 } else {
1852 dout("ceph_queue_invalidate %p already queued, mask=%lx\n",
1853 inode, ci->i_work_mask);
1854 iput(inode);
1855 }
1856}
1857
1858/*
1859 * Queue an async vmtruncate. If we fail to queue work, we will handle
1860 * the truncation the next time we call __ceph_do_pending_vmtruncate.
1861 */
1862void ceph_queue_vmtruncate(struct inode *inode)
1863{
1864 struct ceph_inode_info *ci = ceph_inode(inode);
1865 set_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask);
1866
1867 ihold(inode);
1868 if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1869 &ci->i_work)) {
1870 dout("ceph_queue_vmtruncate %p\n", inode);
1871 } else {
1872 dout("ceph_queue_vmtruncate %p already queued, mask=%lx\n",
1873 inode, ci->i_work_mask);
1874 iput(inode);
1875 }
1876}
1877
1878static void ceph_do_invalidate_pages(struct inode *inode)
1879{
1880 struct ceph_inode_info *ci = ceph_inode(inode);
1881 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1882 u32 orig_gen;
1883 int check = 0;
1884
1885 mutex_lock(&ci->i_truncate_mutex);
1886
1887 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
1888 pr_warn_ratelimited("invalidate_pages %p %lld forced umount\n",
1889 inode, ceph_ino(inode));
1890 mapping_set_error(inode->i_mapping, -EIO);
1891 truncate_pagecache(inode, 0);
1892 mutex_unlock(&ci->i_truncate_mutex);
1893 goto out;
1894 }
1895
1896 spin_lock(&ci->i_ceph_lock);
1897 dout("invalidate_pages %p gen %d revoking %d\n", inode,
1898 ci->i_rdcache_gen, ci->i_rdcache_revoking);
1899 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1900 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1901 check = 1;
1902 spin_unlock(&ci->i_ceph_lock);
1903 mutex_unlock(&ci->i_truncate_mutex);
1904 goto out;
1905 }
1906 orig_gen = ci->i_rdcache_gen;
1907 spin_unlock(&ci->i_ceph_lock);
1908
1909 if (invalidate_inode_pages2(inode->i_mapping) < 0) {
1910 pr_err("invalidate_pages %p fails\n", inode);
1911 }
1912
1913 spin_lock(&ci->i_ceph_lock);
1914 if (orig_gen == ci->i_rdcache_gen &&
1915 orig_gen == ci->i_rdcache_revoking) {
1916 dout("invalidate_pages %p gen %d successful\n", inode,
1917 ci->i_rdcache_gen);
1918 ci->i_rdcache_revoking--;
1919 check = 1;
1920 } else {
1921 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1922 inode, orig_gen, ci->i_rdcache_gen,
1923 ci->i_rdcache_revoking);
1924 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1925 check = 1;
1926 }
1927 spin_unlock(&ci->i_ceph_lock);
1928 mutex_unlock(&ci->i_truncate_mutex);
1929out:
1930 if (check)
1931 ceph_check_caps(ci, 0, NULL);
1932}
1933
1934/*
1935 * Make sure any pending truncation is applied before doing anything
1936 * that may depend on it.
1937 */
1938void __ceph_do_pending_vmtruncate(struct inode *inode)
1939{
1940 struct ceph_inode_info *ci = ceph_inode(inode);
1941 u64 to;
1942 int wrbuffer_refs, finish = 0;
1943
1944 mutex_lock(&ci->i_truncate_mutex);
1945retry:
1946 spin_lock(&ci->i_ceph_lock);
1947 if (ci->i_truncate_pending == 0) {
1948 dout("__do_pending_vmtruncate %p none pending\n", inode);
1949 spin_unlock(&ci->i_ceph_lock);
1950 mutex_unlock(&ci->i_truncate_mutex);
1951 return;
1952 }
1953
1954 /*
1955 * make sure any dirty snapped pages are flushed before we
1956 * possibly truncate them.. so write AND block!
1957 */
1958 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1959 spin_unlock(&ci->i_ceph_lock);
1960 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1961 inode);
1962 filemap_write_and_wait_range(&inode->i_data, 0,
1963 inode->i_sb->s_maxbytes);
1964 goto retry;
1965 }
1966
1967 /* there should be no reader or writer */
1968 WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1969
1970 to = ci->i_truncate_size;
1971 wrbuffer_refs = ci->i_wrbuffer_ref;
1972 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1973 ci->i_truncate_pending, to);
1974 spin_unlock(&ci->i_ceph_lock);
1975
1976 truncate_pagecache(inode, to);
1977
1978 spin_lock(&ci->i_ceph_lock);
1979 if (to == ci->i_truncate_size) {
1980 ci->i_truncate_pending = 0;
1981 finish = 1;
1982 }
1983 spin_unlock(&ci->i_ceph_lock);
1984 if (!finish)
1985 goto retry;
1986
1987 mutex_unlock(&ci->i_truncate_mutex);
1988
1989 if (wrbuffer_refs == 0)
1990 ceph_check_caps(ci, 0, NULL);
1991
1992 wake_up_all(&ci->i_cap_wq);
1993}
1994
1995static void ceph_inode_work(struct work_struct *work)
1996{
1997 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1998 i_work);
1999 struct inode *inode = &ci->vfs_inode;
2000
2001 if (test_and_clear_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask)) {
2002 dout("writeback %p\n", inode);
2003 filemap_fdatawrite(&inode->i_data);
2004 }
2005 if (test_and_clear_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask))
2006 ceph_do_invalidate_pages(inode);
2007
2008 if (test_and_clear_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask))
2009 __ceph_do_pending_vmtruncate(inode);
2010
2011 iput(inode);
2012}
2013
2014/*
2015 * symlinks
2016 */
2017static const struct inode_operations ceph_symlink_iops = {
2018 .get_link = simple_get_link,
2019 .setattr = ceph_setattr,
2020 .getattr = ceph_getattr,
2021 .listxattr = ceph_listxattr,
2022};
2023
2024int __ceph_setattr(struct inode *inode, struct iattr *attr)
2025{
2026 struct ceph_inode_info *ci = ceph_inode(inode);
2027 unsigned int ia_valid = attr->ia_valid;
2028 struct ceph_mds_request *req;
2029 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
2030 struct ceph_cap_flush *prealloc_cf;
2031 int issued;
2032 int release = 0, dirtied = 0;
2033 int mask = 0;
2034 int err = 0;
2035 int inode_dirty_flags = 0;
2036 bool lock_snap_rwsem = false;
2037
2038 prealloc_cf = ceph_alloc_cap_flush();
2039 if (!prealloc_cf)
2040 return -ENOMEM;
2041
2042 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
2043 USE_AUTH_MDS);
2044 if (IS_ERR(req)) {
2045 ceph_free_cap_flush(prealloc_cf);
2046 return PTR_ERR(req);
2047 }
2048
2049 spin_lock(&ci->i_ceph_lock);
2050 issued = __ceph_caps_issued(ci, NULL);
2051
2052 if (!ci->i_head_snapc &&
2053 (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
2054 lock_snap_rwsem = true;
2055 if (!down_read_trylock(&mdsc->snap_rwsem)) {
2056 spin_unlock(&ci->i_ceph_lock);
2057 down_read(&mdsc->snap_rwsem);
2058 spin_lock(&ci->i_ceph_lock);
2059 issued = __ceph_caps_issued(ci, NULL);
2060 }
2061 }
2062
2063 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
2064
2065 if (ia_valid & ATTR_UID) {
2066 dout("setattr %p uid %d -> %d\n", inode,
2067 from_kuid(&init_user_ns, inode->i_uid),
2068 from_kuid(&init_user_ns, attr->ia_uid));
2069 if (issued & CEPH_CAP_AUTH_EXCL) {
2070 inode->i_uid = attr->ia_uid;
2071 dirtied |= CEPH_CAP_AUTH_EXCL;
2072 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2073 !uid_eq(attr->ia_uid, inode->i_uid)) {
2074 req->r_args.setattr.uid = cpu_to_le32(
2075 from_kuid(&init_user_ns, attr->ia_uid));
2076 mask |= CEPH_SETATTR_UID;
2077 release |= CEPH_CAP_AUTH_SHARED;
2078 }
2079 }
2080 if (ia_valid & ATTR_GID) {
2081 dout("setattr %p gid %d -> %d\n", inode,
2082 from_kgid(&init_user_ns, inode->i_gid),
2083 from_kgid(&init_user_ns, attr->ia_gid));
2084 if (issued & CEPH_CAP_AUTH_EXCL) {
2085 inode->i_gid = attr->ia_gid;
2086 dirtied |= CEPH_CAP_AUTH_EXCL;
2087 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2088 !gid_eq(attr->ia_gid, inode->i_gid)) {
2089 req->r_args.setattr.gid = cpu_to_le32(
2090 from_kgid(&init_user_ns, attr->ia_gid));
2091 mask |= CEPH_SETATTR_GID;
2092 release |= CEPH_CAP_AUTH_SHARED;
2093 }
2094 }
2095 if (ia_valid & ATTR_MODE) {
2096 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
2097 attr->ia_mode);
2098 if (issued & CEPH_CAP_AUTH_EXCL) {
2099 inode->i_mode = attr->ia_mode;
2100 dirtied |= CEPH_CAP_AUTH_EXCL;
2101 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2102 attr->ia_mode != inode->i_mode) {
2103 inode->i_mode = attr->ia_mode;
2104 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
2105 mask |= CEPH_SETATTR_MODE;
2106 release |= CEPH_CAP_AUTH_SHARED;
2107 }
2108 }
2109
2110 if (ia_valid & ATTR_ATIME) {
2111 dout("setattr %p atime %lld.%ld -> %lld.%ld\n", inode,
2112 inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
2113 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
2114 if (issued & CEPH_CAP_FILE_EXCL) {
2115 ci->i_time_warp_seq++;
2116 inode->i_atime = attr->ia_atime;
2117 dirtied |= CEPH_CAP_FILE_EXCL;
2118 } else if ((issued & CEPH_CAP_FILE_WR) &&
2119 timespec64_compare(&inode->i_atime,
2120 &attr->ia_atime) < 0) {
2121 inode->i_atime = attr->ia_atime;
2122 dirtied |= CEPH_CAP_FILE_WR;
2123 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2124 !timespec64_equal(&inode->i_atime, &attr->ia_atime)) {
2125 ceph_encode_timespec64(&req->r_args.setattr.atime,
2126 &attr->ia_atime);
2127 mask |= CEPH_SETATTR_ATIME;
2128 release |= CEPH_CAP_FILE_SHARED |
2129 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2130 }
2131 }
2132 if (ia_valid & ATTR_SIZE) {
2133 dout("setattr %p size %lld -> %lld\n", inode,
2134 inode->i_size, attr->ia_size);
2135 if ((issued & CEPH_CAP_FILE_EXCL) &&
2136 attr->ia_size > inode->i_size) {
2137 i_size_write(inode, attr->ia_size);
2138 inode->i_blocks = calc_inode_blocks(attr->ia_size);
2139 ci->i_reported_size = attr->ia_size;
2140 dirtied |= CEPH_CAP_FILE_EXCL;
2141 ia_valid |= ATTR_MTIME;
2142 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2143 attr->ia_size != inode->i_size) {
2144 req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
2145 req->r_args.setattr.old_size =
2146 cpu_to_le64(inode->i_size);
2147 mask |= CEPH_SETATTR_SIZE;
2148 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2149 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2150 }
2151 }
2152 if (ia_valid & ATTR_MTIME) {
2153 dout("setattr %p mtime %lld.%ld -> %lld.%ld\n", inode,
2154 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
2155 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
2156 if (issued & CEPH_CAP_FILE_EXCL) {
2157 ci->i_time_warp_seq++;
2158 inode->i_mtime = attr->ia_mtime;
2159 dirtied |= CEPH_CAP_FILE_EXCL;
2160 } else if ((issued & CEPH_CAP_FILE_WR) &&
2161 timespec64_compare(&inode->i_mtime,
2162 &attr->ia_mtime) < 0) {
2163 inode->i_mtime = attr->ia_mtime;
2164 dirtied |= CEPH_CAP_FILE_WR;
2165 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2166 !timespec64_equal(&inode->i_mtime, &attr->ia_mtime)) {
2167 ceph_encode_timespec64(&req->r_args.setattr.mtime,
2168 &attr->ia_mtime);
2169 mask |= CEPH_SETATTR_MTIME;
2170 release |= CEPH_CAP_FILE_SHARED |
2171 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2172 }
2173 }
2174
2175 /* these do nothing */
2176 if (ia_valid & ATTR_CTIME) {
2177 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
2178 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
2179 dout("setattr %p ctime %lld.%ld -> %lld.%ld (%s)\n", inode,
2180 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
2181 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
2182 only ? "ctime only" : "ignored");
2183 if (only) {
2184 /*
2185 * if kernel wants to dirty ctime but nothing else,
2186 * we need to choose a cap to dirty under, or do
2187 * a almost-no-op setattr
2188 */
2189 if (issued & CEPH_CAP_AUTH_EXCL)
2190 dirtied |= CEPH_CAP_AUTH_EXCL;
2191 else if (issued & CEPH_CAP_FILE_EXCL)
2192 dirtied |= CEPH_CAP_FILE_EXCL;
2193 else if (issued & CEPH_CAP_XATTR_EXCL)
2194 dirtied |= CEPH_CAP_XATTR_EXCL;
2195 else
2196 mask |= CEPH_SETATTR_CTIME;
2197 }
2198 }
2199 if (ia_valid & ATTR_FILE)
2200 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
2201
2202 if (dirtied) {
2203 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
2204 &prealloc_cf);
2205 inode->i_ctime = attr->ia_ctime;
2206 }
2207
2208 release &= issued;
2209 spin_unlock(&ci->i_ceph_lock);
2210 if (lock_snap_rwsem)
2211 up_read(&mdsc->snap_rwsem);
2212
2213 if (inode_dirty_flags)
2214 __mark_inode_dirty(inode, inode_dirty_flags);
2215
2216
2217 if (mask) {
2218 req->r_inode = inode;
2219 ihold(inode);
2220 req->r_inode_drop = release;
2221 req->r_args.setattr.mask = cpu_to_le32(mask);
2222 req->r_num_caps = 1;
2223 req->r_stamp = attr->ia_ctime;
2224 err = ceph_mdsc_do_request(mdsc, NULL, req);
2225 }
2226 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
2227 ceph_cap_string(dirtied), mask);
2228
2229 ceph_mdsc_put_request(req);
2230 ceph_free_cap_flush(prealloc_cf);
2231
2232 if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
2233 __ceph_do_pending_vmtruncate(inode);
2234
2235 return err;
2236}
2237
2238/*
2239 * setattr
2240 */
2241int ceph_setattr(struct dentry *dentry, struct iattr *attr)
2242{
2243 struct inode *inode = d_inode(dentry);
2244 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
2245 int err;
2246
2247 if (ceph_snap(inode) != CEPH_NOSNAP)
2248 return -EROFS;
2249
2250 err = setattr_prepare(dentry, attr);
2251 if (err != 0)
2252 return err;
2253
2254 if ((attr->ia_valid & ATTR_SIZE) &&
2255 attr->ia_size > max(inode->i_size, fsc->max_file_size))
2256 return -EFBIG;
2257
2258 if ((attr->ia_valid & ATTR_SIZE) &&
2259 ceph_quota_is_max_bytes_exceeded(inode, attr->ia_size))
2260 return -EDQUOT;
2261
2262 err = __ceph_setattr(inode, attr);
2263
2264 if (err >= 0 && (attr->ia_valid & ATTR_MODE))
2265 err = posix_acl_chmod(inode, attr->ia_mode);
2266
2267 return err;
2268}
2269
2270/*
2271 * Verify that we have a lease on the given mask. If not,
2272 * do a getattr against an mds.
2273 */
2274int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2275 int mask, bool force)
2276{
2277 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2278 struct ceph_mds_client *mdsc = fsc->mdsc;
2279 struct ceph_mds_request *req;
2280 int mode;
2281 int err;
2282
2283 if (ceph_snap(inode) == CEPH_SNAPDIR) {
2284 dout("do_getattr inode %p SNAPDIR\n", inode);
2285 return 0;
2286 }
2287
2288 dout("do_getattr inode %p mask %s mode 0%o\n",
2289 inode, ceph_cap_string(mask), inode->i_mode);
2290 if (!force && ceph_caps_issued_mask_metric(ceph_inode(inode), mask, 1))
2291 return 0;
2292
2293 mode = (mask & CEPH_STAT_RSTAT) ? USE_AUTH_MDS : USE_ANY_MDS;
2294 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
2295 if (IS_ERR(req))
2296 return PTR_ERR(req);
2297 req->r_inode = inode;
2298 ihold(inode);
2299 req->r_num_caps = 1;
2300 req->r_args.getattr.mask = cpu_to_le32(mask);
2301 req->r_locked_page = locked_page;
2302 err = ceph_mdsc_do_request(mdsc, NULL, req);
2303 if (locked_page && err == 0) {
2304 u64 inline_version = req->r_reply_info.targeti.inline_version;
2305 if (inline_version == 0) {
2306 /* the reply is supposed to contain inline data */
2307 err = -EINVAL;
2308 } else if (inline_version == CEPH_INLINE_NONE) {
2309 err = -ENODATA;
2310 } else {
2311 err = req->r_reply_info.targeti.inline_len;
2312 }
2313 }
2314 ceph_mdsc_put_request(req);
2315 dout("do_getattr result=%d\n", err);
2316 return err;
2317}
2318
2319
2320/*
2321 * Check inode permissions. We verify we have a valid value for
2322 * the AUTH cap, then call the generic handler.
2323 */
2324int ceph_permission(struct inode *inode, int mask)
2325{
2326 int err;
2327
2328 if (mask & MAY_NOT_BLOCK)
2329 return -ECHILD;
2330
2331 err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
2332
2333 if (!err)
2334 err = generic_permission(inode, mask);
2335 return err;
2336}
2337
2338/* Craft a mask of needed caps given a set of requested statx attrs. */
2339static int statx_to_caps(u32 want)
2340{
2341 int mask = 0;
2342
2343 if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME|STATX_BTIME))
2344 mask |= CEPH_CAP_AUTH_SHARED;
2345
2346 if (want & (STATX_NLINK|STATX_CTIME))
2347 mask |= CEPH_CAP_LINK_SHARED;
2348
2349 if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE|
2350 STATX_BLOCKS))
2351 mask |= CEPH_CAP_FILE_SHARED;
2352
2353 if (want & (STATX_CTIME))
2354 mask |= CEPH_CAP_XATTR_SHARED;
2355
2356 return mask;
2357}
2358
2359/*
2360 * Get all the attributes. If we have sufficient caps for the requested attrs,
2361 * then we can avoid talking to the MDS at all.
2362 */
2363int ceph_getattr(const struct path *path, struct kstat *stat,
2364 u32 request_mask, unsigned int flags)
2365{
2366 struct inode *inode = d_inode(path->dentry);
2367 struct ceph_inode_info *ci = ceph_inode(inode);
2368 u32 valid_mask = STATX_BASIC_STATS;
2369 int err = 0;
2370
2371 /* Skip the getattr altogether if we're asked not to sync */
2372 if (!(flags & AT_STATX_DONT_SYNC)) {
2373 err = ceph_do_getattr(inode, statx_to_caps(request_mask),
2374 flags & AT_STATX_FORCE_SYNC);
2375 if (err)
2376 return err;
2377 }
2378
2379 generic_fillattr(inode, stat);
2380 stat->ino = ceph_present_inode(inode);
2381
2382 /*
2383 * btime on newly-allocated inodes is 0, so if this is still set to
2384 * that, then assume that it's not valid.
2385 */
2386 if (ci->i_btime.tv_sec || ci->i_btime.tv_nsec) {
2387 stat->btime = ci->i_btime;
2388 valid_mask |= STATX_BTIME;
2389 }
2390
2391 if (ceph_snap(inode) == CEPH_NOSNAP)
2392 stat->dev = inode->i_sb->s_dev;
2393 else
2394 stat->dev = ci->i_snapid_map ? ci->i_snapid_map->dev : 0;
2395
2396 if (S_ISDIR(inode->i_mode)) {
2397 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
2398 RBYTES))
2399 stat->size = ci->i_rbytes;
2400 else
2401 stat->size = ci->i_files + ci->i_subdirs;
2402 stat->blocks = 0;
2403 stat->blksize = 65536;
2404 /*
2405 * Some applications rely on the number of st_nlink
2406 * value on directories to be either 0 (if unlinked)
2407 * or 2 + number of subdirectories.
2408 */
2409 if (stat->nlink == 1)
2410 /* '.' + '..' + subdirs */
2411 stat->nlink = 1 + 1 + ci->i_subdirs;
2412 }
2413
2414 stat->result_mask = request_mask & valid_mask;
2415 return err;
2416}