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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 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
46
47 ci->i_vino = *(struct ceph_vino *)data;
48 inode->i_ino = ceph_vino_to_ino_t(ci->i_vino);
49 inode_set_iversion_raw(inode, 0);
50 percpu_counter_inc(&mdsc->metric.total_inodes);
51
52 return 0;
53}
54
55struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
56{
57 struct inode *inode;
58
59 if (ceph_vino_is_reserved(vino))
60 return ERR_PTR(-EREMOTEIO);
61
62 inode = iget5_locked(sb, (unsigned long)vino.ino, ceph_ino_compare,
63 ceph_set_ino_cb, &vino);
64 if (!inode)
65 return ERR_PTR(-ENOMEM);
66
67 dout("get_inode on %llu=%llx.%llx got %p new %d\n", ceph_present_inode(inode),
68 ceph_vinop(inode), inode, !!(inode->i_state & I_NEW));
69 return inode;
70}
71
72/*
73 * get/constuct snapdir inode for a given directory
74 */
75struct inode *ceph_get_snapdir(struct inode *parent)
76{
77 struct ceph_vino vino = {
78 .ino = ceph_ino(parent),
79 .snap = CEPH_SNAPDIR,
80 };
81 struct inode *inode = ceph_get_inode(parent->i_sb, vino);
82 struct ceph_inode_info *ci = ceph_inode(inode);
83
84 if (IS_ERR(inode))
85 return inode;
86
87 if (!S_ISDIR(parent->i_mode)) {
88 pr_warn_once("bad snapdir parent type (mode=0%o)\n",
89 parent->i_mode);
90 goto err;
91 }
92
93 if (!(inode->i_state & I_NEW) && !S_ISDIR(inode->i_mode)) {
94 pr_warn_once("bad snapdir inode type (mode=0%o)\n",
95 inode->i_mode);
96 goto err;
97 }
98
99 inode->i_mode = parent->i_mode;
100 inode->i_uid = parent->i_uid;
101 inode->i_gid = parent->i_gid;
102 inode->i_mtime = parent->i_mtime;
103 inode->i_ctime = parent->i_ctime;
104 inode->i_atime = parent->i_atime;
105 ci->i_rbytes = 0;
106 ci->i_btime = ceph_inode(parent)->i_btime;
107
108 if (inode->i_state & I_NEW) {
109 inode->i_op = &ceph_snapdir_iops;
110 inode->i_fop = &ceph_snapdir_fops;
111 ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
112 unlock_new_inode(inode);
113 }
114
115 return inode;
116err:
117 if ((inode->i_state & I_NEW))
118 discard_new_inode(inode);
119 else
120 iput(inode);
121 return ERR_PTR(-ENOTDIR);
122}
123
124const struct inode_operations ceph_file_iops = {
125 .permission = ceph_permission,
126 .setattr = ceph_setattr,
127 .getattr = ceph_getattr,
128 .listxattr = ceph_listxattr,
129 .get_inode_acl = ceph_get_acl,
130 .set_acl = ceph_set_acl,
131};
132
133
134/*
135 * We use a 'frag tree' to keep track of the MDS's directory fragments
136 * for a given inode (usually there is just a single fragment). We
137 * need to know when a child frag is delegated to a new MDS, or when
138 * it is flagged as replicated, so we can direct our requests
139 * accordingly.
140 */
141
142/*
143 * find/create a frag in the tree
144 */
145static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
146 u32 f)
147{
148 struct rb_node **p;
149 struct rb_node *parent = NULL;
150 struct ceph_inode_frag *frag;
151 int c;
152
153 p = &ci->i_fragtree.rb_node;
154 while (*p) {
155 parent = *p;
156 frag = rb_entry(parent, struct ceph_inode_frag, node);
157 c = ceph_frag_compare(f, frag->frag);
158 if (c < 0)
159 p = &(*p)->rb_left;
160 else if (c > 0)
161 p = &(*p)->rb_right;
162 else
163 return frag;
164 }
165
166 frag = kmalloc(sizeof(*frag), GFP_NOFS);
167 if (!frag)
168 return ERR_PTR(-ENOMEM);
169
170 frag->frag = f;
171 frag->split_by = 0;
172 frag->mds = -1;
173 frag->ndist = 0;
174
175 rb_link_node(&frag->node, parent, p);
176 rb_insert_color(&frag->node, &ci->i_fragtree);
177
178 dout("get_or_create_frag added %llx.%llx frag %x\n",
179 ceph_vinop(&ci->netfs.inode), f);
180 return frag;
181}
182
183/*
184 * find a specific frag @f
185 */
186struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
187{
188 struct rb_node *n = ci->i_fragtree.rb_node;
189
190 while (n) {
191 struct ceph_inode_frag *frag =
192 rb_entry(n, struct ceph_inode_frag, node);
193 int c = ceph_frag_compare(f, frag->frag);
194 if (c < 0)
195 n = n->rb_left;
196 else if (c > 0)
197 n = n->rb_right;
198 else
199 return frag;
200 }
201 return NULL;
202}
203
204/*
205 * Choose frag containing the given value @v. If @pfrag is
206 * specified, copy the frag delegation info to the caller if
207 * it is present.
208 */
209static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
210 struct ceph_inode_frag *pfrag, int *found)
211{
212 u32 t = ceph_frag_make(0, 0);
213 struct ceph_inode_frag *frag;
214 unsigned nway, i;
215 u32 n;
216
217 if (found)
218 *found = 0;
219
220 while (1) {
221 WARN_ON(!ceph_frag_contains_value(t, v));
222 frag = __ceph_find_frag(ci, t);
223 if (!frag)
224 break; /* t is a leaf */
225 if (frag->split_by == 0) {
226 if (pfrag)
227 memcpy(pfrag, frag, sizeof(*pfrag));
228 if (found)
229 *found = 1;
230 break;
231 }
232
233 /* choose child */
234 nway = 1 << frag->split_by;
235 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
236 frag->split_by, nway);
237 for (i = 0; i < nway; i++) {
238 n = ceph_frag_make_child(t, frag->split_by, i);
239 if (ceph_frag_contains_value(n, v)) {
240 t = n;
241 break;
242 }
243 }
244 BUG_ON(i == nway);
245 }
246 dout("choose_frag(%x) = %x\n", v, t);
247
248 return t;
249}
250
251u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
252 struct ceph_inode_frag *pfrag, int *found)
253{
254 u32 ret;
255 mutex_lock(&ci->i_fragtree_mutex);
256 ret = __ceph_choose_frag(ci, v, pfrag, found);
257 mutex_unlock(&ci->i_fragtree_mutex);
258 return ret;
259}
260
261/*
262 * Process dirfrag (delegation) info from the mds. Include leaf
263 * fragment in tree ONLY if ndist > 0. Otherwise, only
264 * branches/splits are included in i_fragtree)
265 */
266static int ceph_fill_dirfrag(struct inode *inode,
267 struct ceph_mds_reply_dirfrag *dirinfo)
268{
269 struct ceph_inode_info *ci = ceph_inode(inode);
270 struct ceph_inode_frag *frag;
271 u32 id = le32_to_cpu(dirinfo->frag);
272 int mds = le32_to_cpu(dirinfo->auth);
273 int ndist = le32_to_cpu(dirinfo->ndist);
274 int diri_auth = -1;
275 int i;
276 int err = 0;
277
278 spin_lock(&ci->i_ceph_lock);
279 if (ci->i_auth_cap)
280 diri_auth = ci->i_auth_cap->mds;
281 spin_unlock(&ci->i_ceph_lock);
282
283 if (mds == -1) /* CDIR_AUTH_PARENT */
284 mds = diri_auth;
285
286 mutex_lock(&ci->i_fragtree_mutex);
287 if (ndist == 0 && mds == diri_auth) {
288 /* no delegation info needed. */
289 frag = __ceph_find_frag(ci, id);
290 if (!frag)
291 goto out;
292 if (frag->split_by == 0) {
293 /* tree leaf, remove */
294 dout("fill_dirfrag removed %llx.%llx frag %x"
295 " (no ref)\n", ceph_vinop(inode), id);
296 rb_erase(&frag->node, &ci->i_fragtree);
297 kfree(frag);
298 } else {
299 /* tree branch, keep and clear */
300 dout("fill_dirfrag cleared %llx.%llx frag %x"
301 " referral\n", ceph_vinop(inode), id);
302 frag->mds = -1;
303 frag->ndist = 0;
304 }
305 goto out;
306 }
307
308
309 /* find/add this frag to store mds delegation info */
310 frag = __get_or_create_frag(ci, id);
311 if (IS_ERR(frag)) {
312 /* this is not the end of the world; we can continue
313 with bad/inaccurate delegation info */
314 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
315 ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
316 err = -ENOMEM;
317 goto out;
318 }
319
320 frag->mds = mds;
321 frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
322 for (i = 0; i < frag->ndist; i++)
323 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
324 dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
325 ceph_vinop(inode), frag->frag, frag->ndist);
326
327out:
328 mutex_unlock(&ci->i_fragtree_mutex);
329 return err;
330}
331
332static int frag_tree_split_cmp(const void *l, const void *r)
333{
334 struct ceph_frag_tree_split *ls = (struct ceph_frag_tree_split*)l;
335 struct ceph_frag_tree_split *rs = (struct ceph_frag_tree_split*)r;
336 return ceph_frag_compare(le32_to_cpu(ls->frag),
337 le32_to_cpu(rs->frag));
338}
339
340static bool is_frag_child(u32 f, struct ceph_inode_frag *frag)
341{
342 if (!frag)
343 return f == ceph_frag_make(0, 0);
344 if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by)
345 return false;
346 return ceph_frag_contains_value(frag->frag, ceph_frag_value(f));
347}
348
349static int ceph_fill_fragtree(struct inode *inode,
350 struct ceph_frag_tree_head *fragtree,
351 struct ceph_mds_reply_dirfrag *dirinfo)
352{
353 struct ceph_inode_info *ci = ceph_inode(inode);
354 struct ceph_inode_frag *frag, *prev_frag = NULL;
355 struct rb_node *rb_node;
356 unsigned i, split_by, nsplits;
357 u32 id;
358 bool update = false;
359
360 mutex_lock(&ci->i_fragtree_mutex);
361 nsplits = le32_to_cpu(fragtree->nsplits);
362 if (nsplits != ci->i_fragtree_nsplits) {
363 update = true;
364 } else if (nsplits) {
365 i = get_random_u32_below(nsplits);
366 id = le32_to_cpu(fragtree->splits[i].frag);
367 if (!__ceph_find_frag(ci, id))
368 update = true;
369 } else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) {
370 rb_node = rb_first(&ci->i_fragtree);
371 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
372 if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node))
373 update = true;
374 }
375 if (!update && dirinfo) {
376 id = le32_to_cpu(dirinfo->frag);
377 if (id != __ceph_choose_frag(ci, id, NULL, NULL))
378 update = true;
379 }
380 if (!update)
381 goto out_unlock;
382
383 if (nsplits > 1) {
384 sort(fragtree->splits, nsplits, sizeof(fragtree->splits[0]),
385 frag_tree_split_cmp, NULL);
386 }
387
388 dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode));
389 rb_node = rb_first(&ci->i_fragtree);
390 for (i = 0; i < nsplits; i++) {
391 id = le32_to_cpu(fragtree->splits[i].frag);
392 split_by = le32_to_cpu(fragtree->splits[i].by);
393 if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) {
394 pr_err("fill_fragtree %llx.%llx invalid split %d/%u, "
395 "frag %x split by %d\n", ceph_vinop(inode),
396 i, nsplits, id, split_by);
397 continue;
398 }
399 frag = NULL;
400 while (rb_node) {
401 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
402 if (ceph_frag_compare(frag->frag, id) >= 0) {
403 if (frag->frag != id)
404 frag = NULL;
405 else
406 rb_node = rb_next(rb_node);
407 break;
408 }
409 rb_node = rb_next(rb_node);
410 /* delete stale split/leaf node */
411 if (frag->split_by > 0 ||
412 !is_frag_child(frag->frag, prev_frag)) {
413 rb_erase(&frag->node, &ci->i_fragtree);
414 if (frag->split_by > 0)
415 ci->i_fragtree_nsplits--;
416 kfree(frag);
417 }
418 frag = NULL;
419 }
420 if (!frag) {
421 frag = __get_or_create_frag(ci, id);
422 if (IS_ERR(frag))
423 continue;
424 }
425 if (frag->split_by == 0)
426 ci->i_fragtree_nsplits++;
427 frag->split_by = split_by;
428 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
429 prev_frag = frag;
430 }
431 while (rb_node) {
432 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
433 rb_node = rb_next(rb_node);
434 /* delete stale split/leaf node */
435 if (frag->split_by > 0 ||
436 !is_frag_child(frag->frag, prev_frag)) {
437 rb_erase(&frag->node, &ci->i_fragtree);
438 if (frag->split_by > 0)
439 ci->i_fragtree_nsplits--;
440 kfree(frag);
441 }
442 }
443out_unlock:
444 mutex_unlock(&ci->i_fragtree_mutex);
445 return 0;
446}
447
448/*
449 * initialize a newly allocated inode.
450 */
451struct inode *ceph_alloc_inode(struct super_block *sb)
452{
453 struct ceph_inode_info *ci;
454 int i;
455
456 ci = alloc_inode_sb(sb, ceph_inode_cachep, GFP_NOFS);
457 if (!ci)
458 return NULL;
459
460 dout("alloc_inode %p\n", &ci->netfs.inode);
461
462 /* Set parameters for the netfs library */
463 netfs_inode_init(&ci->netfs, &ceph_netfs_ops);
464
465 spin_lock_init(&ci->i_ceph_lock);
466
467 ci->i_version = 0;
468 ci->i_inline_version = 0;
469 ci->i_time_warp_seq = 0;
470 ci->i_ceph_flags = 0;
471 atomic64_set(&ci->i_ordered_count, 1);
472 atomic64_set(&ci->i_release_count, 1);
473 atomic64_set(&ci->i_complete_seq[0], 0);
474 atomic64_set(&ci->i_complete_seq[1], 0);
475 ci->i_symlink = NULL;
476
477 ci->i_max_bytes = 0;
478 ci->i_max_files = 0;
479
480 memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
481 memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
482 RCU_INIT_POINTER(ci->i_layout.pool_ns, NULL);
483
484 ci->i_fragtree = RB_ROOT;
485 mutex_init(&ci->i_fragtree_mutex);
486
487 ci->i_xattrs.blob = NULL;
488 ci->i_xattrs.prealloc_blob = NULL;
489 ci->i_xattrs.dirty = false;
490 ci->i_xattrs.index = RB_ROOT;
491 ci->i_xattrs.count = 0;
492 ci->i_xattrs.names_size = 0;
493 ci->i_xattrs.vals_size = 0;
494 ci->i_xattrs.version = 0;
495 ci->i_xattrs.index_version = 0;
496
497 ci->i_caps = RB_ROOT;
498 ci->i_auth_cap = NULL;
499 ci->i_dirty_caps = 0;
500 ci->i_flushing_caps = 0;
501 INIT_LIST_HEAD(&ci->i_dirty_item);
502 INIT_LIST_HEAD(&ci->i_flushing_item);
503 ci->i_prealloc_cap_flush = NULL;
504 INIT_LIST_HEAD(&ci->i_cap_flush_list);
505 init_waitqueue_head(&ci->i_cap_wq);
506 ci->i_hold_caps_max = 0;
507 INIT_LIST_HEAD(&ci->i_cap_delay_list);
508 INIT_LIST_HEAD(&ci->i_cap_snaps);
509 ci->i_head_snapc = NULL;
510 ci->i_snap_caps = 0;
511
512 ci->i_last_rd = ci->i_last_wr = jiffies - 3600 * HZ;
513 for (i = 0; i < CEPH_FILE_MODE_BITS; i++)
514 ci->i_nr_by_mode[i] = 0;
515
516 mutex_init(&ci->i_truncate_mutex);
517 ci->i_truncate_seq = 0;
518 ci->i_truncate_size = 0;
519 ci->i_truncate_pending = 0;
520
521 ci->i_max_size = 0;
522 ci->i_reported_size = 0;
523 ci->i_wanted_max_size = 0;
524 ci->i_requested_max_size = 0;
525
526 ci->i_pin_ref = 0;
527 ci->i_rd_ref = 0;
528 ci->i_rdcache_ref = 0;
529 ci->i_wr_ref = 0;
530 ci->i_wb_ref = 0;
531 ci->i_fx_ref = 0;
532 ci->i_wrbuffer_ref = 0;
533 ci->i_wrbuffer_ref_head = 0;
534 atomic_set(&ci->i_filelock_ref, 0);
535 atomic_set(&ci->i_shared_gen, 1);
536 ci->i_rdcache_gen = 0;
537 ci->i_rdcache_revoking = 0;
538
539 INIT_LIST_HEAD(&ci->i_unsafe_dirops);
540 INIT_LIST_HEAD(&ci->i_unsafe_iops);
541 spin_lock_init(&ci->i_unsafe_lock);
542
543 ci->i_snap_realm = NULL;
544 INIT_LIST_HEAD(&ci->i_snap_realm_item);
545 INIT_LIST_HEAD(&ci->i_snap_flush_item);
546
547 INIT_WORK(&ci->i_work, ceph_inode_work);
548 ci->i_work_mask = 0;
549 memset(&ci->i_btime, '\0', sizeof(ci->i_btime));
550 return &ci->netfs.inode;
551}
552
553void ceph_free_inode(struct inode *inode)
554{
555 struct ceph_inode_info *ci = ceph_inode(inode);
556
557 kfree(ci->i_symlink);
558 kmem_cache_free(ceph_inode_cachep, ci);
559}
560
561void ceph_evict_inode(struct inode *inode)
562{
563 struct ceph_inode_info *ci = ceph_inode(inode);
564 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
565 struct ceph_inode_frag *frag;
566 struct rb_node *n;
567
568 dout("evict_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
569
570 percpu_counter_dec(&mdsc->metric.total_inodes);
571
572 truncate_inode_pages_final(&inode->i_data);
573 if (inode->i_state & I_PINNING_FSCACHE_WB)
574 ceph_fscache_unuse_cookie(inode, true);
575 clear_inode(inode);
576
577 ceph_fscache_unregister_inode_cookie(ci);
578
579 __ceph_remove_caps(ci);
580
581 if (__ceph_has_quota(ci, QUOTA_GET_ANY))
582 ceph_adjust_quota_realms_count(inode, false);
583
584 /*
585 * we may still have a snap_realm reference if there are stray
586 * caps in i_snap_caps.
587 */
588 if (ci->i_snap_realm) {
589 if (ceph_snap(inode) == CEPH_NOSNAP) {
590 dout(" dropping residual ref to snap realm %p\n",
591 ci->i_snap_realm);
592 ceph_change_snap_realm(inode, NULL);
593 } else {
594 ceph_put_snapid_map(mdsc, ci->i_snapid_map);
595 ci->i_snap_realm = NULL;
596 }
597 }
598
599 while ((n = rb_first(&ci->i_fragtree)) != NULL) {
600 frag = rb_entry(n, struct ceph_inode_frag, node);
601 rb_erase(n, &ci->i_fragtree);
602 kfree(frag);
603 }
604 ci->i_fragtree_nsplits = 0;
605
606 __ceph_destroy_xattrs(ci);
607 if (ci->i_xattrs.blob)
608 ceph_buffer_put(ci->i_xattrs.blob);
609 if (ci->i_xattrs.prealloc_blob)
610 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
611
612 ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns));
613 ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
614}
615
616static inline blkcnt_t calc_inode_blocks(u64 size)
617{
618 return (size + (1<<9) - 1) >> 9;
619}
620
621/*
622 * Helpers to fill in size, ctime, mtime, and atime. We have to be
623 * careful because either the client or MDS may have more up to date
624 * info, depending on which capabilities are held, and whether
625 * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime
626 * and size are monotonically increasing, except when utimes() or
627 * truncate() increments the corresponding _seq values.)
628 */
629int ceph_fill_file_size(struct inode *inode, int issued,
630 u32 truncate_seq, u64 truncate_size, u64 size)
631{
632 struct ceph_inode_info *ci = ceph_inode(inode);
633 int queue_trunc = 0;
634 loff_t isize = i_size_read(inode);
635
636 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
637 (truncate_seq == ci->i_truncate_seq && size > isize)) {
638 dout("size %lld -> %llu\n", isize, size);
639 if (size > 0 && S_ISDIR(inode->i_mode)) {
640 pr_err("fill_file_size non-zero size for directory\n");
641 size = 0;
642 }
643 i_size_write(inode, size);
644 inode->i_blocks = calc_inode_blocks(size);
645 /*
646 * If we're expanding, then we should be able to just update
647 * the existing cookie.
648 */
649 if (size > isize)
650 ceph_fscache_update(inode);
651 ci->i_reported_size = size;
652 if (truncate_seq != ci->i_truncate_seq) {
653 dout("truncate_seq %u -> %u\n",
654 ci->i_truncate_seq, truncate_seq);
655 ci->i_truncate_seq = truncate_seq;
656
657 /* the MDS should have revoked these caps */
658 WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
659 CEPH_CAP_FILE_RD |
660 CEPH_CAP_FILE_WR |
661 CEPH_CAP_FILE_LAZYIO));
662 /*
663 * If we hold relevant caps, or in the case where we're
664 * not the only client referencing this file and we
665 * don't hold those caps, then we need to check whether
666 * the file is either opened or mmaped
667 */
668 if ((issued & (CEPH_CAP_FILE_CACHE|
669 CEPH_CAP_FILE_BUFFER)) ||
670 mapping_mapped(inode->i_mapping) ||
671 __ceph_is_file_opened(ci)) {
672 ci->i_truncate_pending++;
673 queue_trunc = 1;
674 }
675 }
676 }
677 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
678 ci->i_truncate_size != truncate_size) {
679 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
680 truncate_size);
681 ci->i_truncate_size = truncate_size;
682 }
683 return queue_trunc;
684}
685
686void ceph_fill_file_time(struct inode *inode, int issued,
687 u64 time_warp_seq, struct timespec64 *ctime,
688 struct timespec64 *mtime, struct timespec64 *atime)
689{
690 struct ceph_inode_info *ci = ceph_inode(inode);
691 int warn = 0;
692
693 if (issued & (CEPH_CAP_FILE_EXCL|
694 CEPH_CAP_FILE_WR|
695 CEPH_CAP_FILE_BUFFER|
696 CEPH_CAP_AUTH_EXCL|
697 CEPH_CAP_XATTR_EXCL)) {
698 if (ci->i_version == 0 ||
699 timespec64_compare(ctime, &inode->i_ctime) > 0) {
700 dout("ctime %lld.%09ld -> %lld.%09ld inc w/ cap\n",
701 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
702 ctime->tv_sec, ctime->tv_nsec);
703 inode->i_ctime = *ctime;
704 }
705 if (ci->i_version == 0 ||
706 ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
707 /* the MDS did a utimes() */
708 dout("mtime %lld.%09ld -> %lld.%09ld "
709 "tw %d -> %d\n",
710 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
711 mtime->tv_sec, mtime->tv_nsec,
712 ci->i_time_warp_seq, (int)time_warp_seq);
713
714 inode->i_mtime = *mtime;
715 inode->i_atime = *atime;
716 ci->i_time_warp_seq = time_warp_seq;
717 } else if (time_warp_seq == ci->i_time_warp_seq) {
718 /* nobody did utimes(); take the max */
719 if (timespec64_compare(mtime, &inode->i_mtime) > 0) {
720 dout("mtime %lld.%09ld -> %lld.%09ld inc\n",
721 inode->i_mtime.tv_sec,
722 inode->i_mtime.tv_nsec,
723 mtime->tv_sec, mtime->tv_nsec);
724 inode->i_mtime = *mtime;
725 }
726 if (timespec64_compare(atime, &inode->i_atime) > 0) {
727 dout("atime %lld.%09ld -> %lld.%09ld inc\n",
728 inode->i_atime.tv_sec,
729 inode->i_atime.tv_nsec,
730 atime->tv_sec, atime->tv_nsec);
731 inode->i_atime = *atime;
732 }
733 } else if (issued & CEPH_CAP_FILE_EXCL) {
734 /* we did a utimes(); ignore mds values */
735 } else {
736 warn = 1;
737 }
738 } else {
739 /* we have no write|excl caps; whatever the MDS says is true */
740 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
741 inode->i_ctime = *ctime;
742 inode->i_mtime = *mtime;
743 inode->i_atime = *atime;
744 ci->i_time_warp_seq = time_warp_seq;
745 } else {
746 warn = 1;
747 }
748 }
749 if (warn) /* time_warp_seq shouldn't go backwards */
750 dout("%p mds time_warp_seq %llu < %u\n",
751 inode, time_warp_seq, ci->i_time_warp_seq);
752}
753
754/*
755 * Populate an inode based on info from mds. May be called on new or
756 * existing inodes.
757 */
758int ceph_fill_inode(struct inode *inode, struct page *locked_page,
759 struct ceph_mds_reply_info_in *iinfo,
760 struct ceph_mds_reply_dirfrag *dirinfo,
761 struct ceph_mds_session *session, int cap_fmode,
762 struct ceph_cap_reservation *caps_reservation)
763{
764 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
765 struct ceph_mds_reply_inode *info = iinfo->in;
766 struct ceph_inode_info *ci = ceph_inode(inode);
767 int issued, new_issued, info_caps;
768 struct timespec64 mtime, atime, ctime;
769 struct ceph_buffer *xattr_blob = NULL;
770 struct ceph_buffer *old_blob = NULL;
771 struct ceph_string *pool_ns = NULL;
772 struct ceph_cap *new_cap = NULL;
773 int err = 0;
774 bool wake = false;
775 bool queue_trunc = false;
776 bool new_version = false;
777 bool fill_inline = false;
778 umode_t mode = le32_to_cpu(info->mode);
779 dev_t rdev = le32_to_cpu(info->rdev);
780
781 lockdep_assert_held(&mdsc->snap_rwsem);
782
783 dout("%s %p ino %llx.%llx v %llu had %llu\n", __func__,
784 inode, ceph_vinop(inode), le64_to_cpu(info->version),
785 ci->i_version);
786
787 /* Once I_NEW is cleared, we can't change type or dev numbers */
788 if (inode->i_state & I_NEW) {
789 inode->i_mode = mode;
790 } else {
791 if (inode_wrong_type(inode, mode)) {
792 pr_warn_once("inode type changed! (ino %llx.%llx is 0%o, mds says 0%o)\n",
793 ceph_vinop(inode), inode->i_mode, mode);
794 return -ESTALE;
795 }
796
797 if ((S_ISCHR(mode) || S_ISBLK(mode)) && inode->i_rdev != rdev) {
798 pr_warn_once("dev inode rdev changed! (ino %llx.%llx is %u:%u, mds says %u:%u)\n",
799 ceph_vinop(inode), MAJOR(inode->i_rdev),
800 MINOR(inode->i_rdev), MAJOR(rdev),
801 MINOR(rdev));
802 return -ESTALE;
803 }
804 }
805
806 info_caps = le32_to_cpu(info->cap.caps);
807
808 /* prealloc new cap struct */
809 if (info_caps && ceph_snap(inode) == CEPH_NOSNAP) {
810 new_cap = ceph_get_cap(mdsc, caps_reservation);
811 if (!new_cap)
812 return -ENOMEM;
813 }
814
815 /*
816 * prealloc xattr data, if it looks like we'll need it. only
817 * if len > 4 (meaning there are actually xattrs; the first 4
818 * bytes are the xattr count).
819 */
820 if (iinfo->xattr_len > 4) {
821 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
822 if (!xattr_blob)
823 pr_err("%s ENOMEM xattr blob %d bytes\n", __func__,
824 iinfo->xattr_len);
825 }
826
827 if (iinfo->pool_ns_len > 0)
828 pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data,
829 iinfo->pool_ns_len);
830
831 if (ceph_snap(inode) != CEPH_NOSNAP && !ci->i_snapid_map)
832 ci->i_snapid_map = ceph_get_snapid_map(mdsc, ceph_snap(inode));
833
834 spin_lock(&ci->i_ceph_lock);
835
836 /*
837 * provided version will be odd if inode value is projected,
838 * even if stable. skip the update if we have newer stable
839 * info (ours>=theirs, e.g. due to racing mds replies), unless
840 * we are getting projected (unstable) info (in which case the
841 * version is odd, and we want ours>theirs).
842 * us them
843 * 2 2 skip
844 * 3 2 skip
845 * 3 3 update
846 */
847 if (ci->i_version == 0 ||
848 ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
849 le64_to_cpu(info->version) > (ci->i_version & ~1)))
850 new_version = true;
851
852 /* Update change_attribute */
853 inode_set_max_iversion_raw(inode, iinfo->change_attr);
854
855 __ceph_caps_issued(ci, &issued);
856 issued |= __ceph_caps_dirty(ci);
857 new_issued = ~issued & info_caps;
858
859 /* directories have fl_stripe_unit set to zero */
860 if (le32_to_cpu(info->layout.fl_stripe_unit))
861 inode->i_blkbits =
862 fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
863 else
864 inode->i_blkbits = CEPH_BLOCK_SHIFT;
865
866 __ceph_update_quota(ci, iinfo->max_bytes, iinfo->max_files);
867
868 if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
869 (issued & CEPH_CAP_AUTH_EXCL) == 0) {
870 inode->i_mode = mode;
871 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
872 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
873 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
874 from_kuid(&init_user_ns, inode->i_uid),
875 from_kgid(&init_user_ns, inode->i_gid));
876 ceph_decode_timespec64(&ci->i_btime, &iinfo->btime);
877 ceph_decode_timespec64(&ci->i_snap_btime, &iinfo->snap_btime);
878 }
879
880 if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
881 (issued & CEPH_CAP_LINK_EXCL) == 0)
882 set_nlink(inode, le32_to_cpu(info->nlink));
883
884 if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
885 /* be careful with mtime, atime, size */
886 ceph_decode_timespec64(&atime, &info->atime);
887 ceph_decode_timespec64(&mtime, &info->mtime);
888 ceph_decode_timespec64(&ctime, &info->ctime);
889 ceph_fill_file_time(inode, issued,
890 le32_to_cpu(info->time_warp_seq),
891 &ctime, &mtime, &atime);
892 }
893
894 if (new_version || (info_caps & CEPH_CAP_FILE_SHARED)) {
895 ci->i_files = le64_to_cpu(info->files);
896 ci->i_subdirs = le64_to_cpu(info->subdirs);
897 }
898
899 if (new_version ||
900 (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
901 s64 old_pool = ci->i_layout.pool_id;
902 struct ceph_string *old_ns;
903
904 ceph_file_layout_from_legacy(&ci->i_layout, &info->layout);
905 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
906 lockdep_is_held(&ci->i_ceph_lock));
907 rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns);
908
909 if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns)
910 ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
911
912 pool_ns = old_ns;
913
914 queue_trunc = ceph_fill_file_size(inode, issued,
915 le32_to_cpu(info->truncate_seq),
916 le64_to_cpu(info->truncate_size),
917 le64_to_cpu(info->size));
918 /* only update max_size on auth cap */
919 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
920 ci->i_max_size != le64_to_cpu(info->max_size)) {
921 dout("max_size %lld -> %llu\n", ci->i_max_size,
922 le64_to_cpu(info->max_size));
923 ci->i_max_size = le64_to_cpu(info->max_size);
924 }
925 }
926
927 /* layout and rstat are not tracked by capability, update them if
928 * the inode info is from auth mds */
929 if (new_version || (info->cap.flags & CEPH_CAP_FLAG_AUTH)) {
930 if (S_ISDIR(inode->i_mode)) {
931 ci->i_dir_layout = iinfo->dir_layout;
932 ci->i_rbytes = le64_to_cpu(info->rbytes);
933 ci->i_rfiles = le64_to_cpu(info->rfiles);
934 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
935 ci->i_dir_pin = iinfo->dir_pin;
936 ci->i_rsnaps = iinfo->rsnaps;
937 ceph_decode_timespec64(&ci->i_rctime, &info->rctime);
938 }
939 }
940
941 /* xattrs */
942 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
943 if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL)) &&
944 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
945 if (ci->i_xattrs.blob)
946 old_blob = ci->i_xattrs.blob;
947 ci->i_xattrs.blob = xattr_blob;
948 if (xattr_blob)
949 memcpy(ci->i_xattrs.blob->vec.iov_base,
950 iinfo->xattr_data, iinfo->xattr_len);
951 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
952 ceph_forget_all_cached_acls(inode);
953 ceph_security_invalidate_secctx(inode);
954 xattr_blob = NULL;
955 }
956
957 /* finally update i_version */
958 if (le64_to_cpu(info->version) > ci->i_version)
959 ci->i_version = le64_to_cpu(info->version);
960
961 inode->i_mapping->a_ops = &ceph_aops;
962
963 switch (inode->i_mode & S_IFMT) {
964 case S_IFIFO:
965 case S_IFBLK:
966 case S_IFCHR:
967 case S_IFSOCK:
968 inode->i_blkbits = PAGE_SHIFT;
969 init_special_inode(inode, inode->i_mode, rdev);
970 inode->i_op = &ceph_file_iops;
971 break;
972 case S_IFREG:
973 inode->i_op = &ceph_file_iops;
974 inode->i_fop = &ceph_file_fops;
975 break;
976 case S_IFLNK:
977 inode->i_op = &ceph_symlink_iops;
978 if (!ci->i_symlink) {
979 u32 symlen = iinfo->symlink_len;
980 char *sym;
981
982 spin_unlock(&ci->i_ceph_lock);
983
984 if (symlen != i_size_read(inode)) {
985 pr_err("%s %llx.%llx BAD symlink "
986 "size %lld\n", __func__,
987 ceph_vinop(inode),
988 i_size_read(inode));
989 i_size_write(inode, symlen);
990 inode->i_blocks = calc_inode_blocks(symlen);
991 }
992
993 err = -ENOMEM;
994 sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
995 if (!sym)
996 goto out;
997
998 spin_lock(&ci->i_ceph_lock);
999 if (!ci->i_symlink)
1000 ci->i_symlink = sym;
1001 else
1002 kfree(sym); /* lost a race */
1003 }
1004 inode->i_link = ci->i_symlink;
1005 break;
1006 case S_IFDIR:
1007 inode->i_op = &ceph_dir_iops;
1008 inode->i_fop = &ceph_dir_fops;
1009 break;
1010 default:
1011 pr_err("%s %llx.%llx BAD mode 0%o\n", __func__,
1012 ceph_vinop(inode), inode->i_mode);
1013 }
1014
1015 /* were we issued a capability? */
1016 if (info_caps) {
1017 if (ceph_snap(inode) == CEPH_NOSNAP) {
1018 ceph_add_cap(inode, session,
1019 le64_to_cpu(info->cap.cap_id),
1020 info_caps,
1021 le32_to_cpu(info->cap.wanted),
1022 le32_to_cpu(info->cap.seq),
1023 le32_to_cpu(info->cap.mseq),
1024 le64_to_cpu(info->cap.realm),
1025 info->cap.flags, &new_cap);
1026
1027 /* set dir completion flag? */
1028 if (S_ISDIR(inode->i_mode) &&
1029 ci->i_files == 0 && ci->i_subdirs == 0 &&
1030 (info_caps & CEPH_CAP_FILE_SHARED) &&
1031 (issued & CEPH_CAP_FILE_EXCL) == 0 &&
1032 !__ceph_dir_is_complete(ci)) {
1033 dout(" marking %p complete (empty)\n", inode);
1034 i_size_write(inode, 0);
1035 __ceph_dir_set_complete(ci,
1036 atomic64_read(&ci->i_release_count),
1037 atomic64_read(&ci->i_ordered_count));
1038 }
1039
1040 wake = true;
1041 } else {
1042 dout(" %p got snap_caps %s\n", inode,
1043 ceph_cap_string(info_caps));
1044 ci->i_snap_caps |= info_caps;
1045 }
1046 }
1047
1048 if (iinfo->inline_version > 0 &&
1049 iinfo->inline_version >= ci->i_inline_version) {
1050 int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1051 ci->i_inline_version = iinfo->inline_version;
1052 if (ceph_has_inline_data(ci) &&
1053 (locked_page || (info_caps & cache_caps)))
1054 fill_inline = true;
1055 }
1056
1057 if (cap_fmode >= 0) {
1058 if (!info_caps)
1059 pr_warn("mds issued no caps on %llx.%llx\n",
1060 ceph_vinop(inode));
1061 __ceph_touch_fmode(ci, mdsc, cap_fmode);
1062 }
1063
1064 spin_unlock(&ci->i_ceph_lock);
1065
1066 ceph_fscache_register_inode_cookie(inode);
1067
1068 if (fill_inline)
1069 ceph_fill_inline_data(inode, locked_page,
1070 iinfo->inline_data, iinfo->inline_len);
1071
1072 if (wake)
1073 wake_up_all(&ci->i_cap_wq);
1074
1075 /* queue truncate if we saw i_size decrease */
1076 if (queue_trunc)
1077 ceph_queue_vmtruncate(inode);
1078
1079 /* populate frag tree */
1080 if (S_ISDIR(inode->i_mode))
1081 ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
1082
1083 /* update delegation info? */
1084 if (dirinfo)
1085 ceph_fill_dirfrag(inode, dirinfo);
1086
1087 err = 0;
1088out:
1089 if (new_cap)
1090 ceph_put_cap(mdsc, new_cap);
1091 ceph_buffer_put(old_blob);
1092 ceph_buffer_put(xattr_blob);
1093 ceph_put_string(pool_ns);
1094 return err;
1095}
1096
1097/*
1098 * caller should hold session s_mutex and dentry->d_lock.
1099 */
1100static void __update_dentry_lease(struct inode *dir, struct dentry *dentry,
1101 struct ceph_mds_reply_lease *lease,
1102 struct ceph_mds_session *session,
1103 unsigned long from_time,
1104 struct ceph_mds_session **old_lease_session)
1105{
1106 struct ceph_dentry_info *di = ceph_dentry(dentry);
1107 unsigned mask = le16_to_cpu(lease->mask);
1108 long unsigned duration = le32_to_cpu(lease->duration_ms);
1109 long unsigned ttl = from_time + (duration * HZ) / 1000;
1110 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
1111
1112 dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
1113 dentry, duration, ttl);
1114
1115 /* only track leases on regular dentries */
1116 if (ceph_snap(dir) != CEPH_NOSNAP)
1117 return;
1118
1119 if (mask & CEPH_LEASE_PRIMARY_LINK)
1120 di->flags |= CEPH_DENTRY_PRIMARY_LINK;
1121 else
1122 di->flags &= ~CEPH_DENTRY_PRIMARY_LINK;
1123
1124 di->lease_shared_gen = atomic_read(&ceph_inode(dir)->i_shared_gen);
1125 if (!(mask & CEPH_LEASE_VALID)) {
1126 __ceph_dentry_dir_lease_touch(di);
1127 return;
1128 }
1129
1130 if (di->lease_gen == atomic_read(&session->s_cap_gen) &&
1131 time_before(ttl, di->time))
1132 return; /* we already have a newer lease. */
1133
1134 if (di->lease_session && di->lease_session != session) {
1135 *old_lease_session = di->lease_session;
1136 di->lease_session = NULL;
1137 }
1138
1139 if (!di->lease_session)
1140 di->lease_session = ceph_get_mds_session(session);
1141 di->lease_gen = atomic_read(&session->s_cap_gen);
1142 di->lease_seq = le32_to_cpu(lease->seq);
1143 di->lease_renew_after = half_ttl;
1144 di->lease_renew_from = 0;
1145 di->time = ttl;
1146
1147 __ceph_dentry_lease_touch(di);
1148}
1149
1150static inline void update_dentry_lease(struct inode *dir, struct dentry *dentry,
1151 struct ceph_mds_reply_lease *lease,
1152 struct ceph_mds_session *session,
1153 unsigned long from_time)
1154{
1155 struct ceph_mds_session *old_lease_session = NULL;
1156 spin_lock(&dentry->d_lock);
1157 __update_dentry_lease(dir, dentry, lease, session, from_time,
1158 &old_lease_session);
1159 spin_unlock(&dentry->d_lock);
1160 ceph_put_mds_session(old_lease_session);
1161}
1162
1163/*
1164 * update dentry lease without having parent inode locked
1165 */
1166static void update_dentry_lease_careful(struct dentry *dentry,
1167 struct ceph_mds_reply_lease *lease,
1168 struct ceph_mds_session *session,
1169 unsigned long from_time,
1170 char *dname, u32 dname_len,
1171 struct ceph_vino *pdvino,
1172 struct ceph_vino *ptvino)
1173
1174{
1175 struct inode *dir;
1176 struct ceph_mds_session *old_lease_session = NULL;
1177
1178 spin_lock(&dentry->d_lock);
1179 /* make sure dentry's name matches target */
1180 if (dentry->d_name.len != dname_len ||
1181 memcmp(dentry->d_name.name, dname, dname_len))
1182 goto out_unlock;
1183
1184 dir = d_inode(dentry->d_parent);
1185 /* make sure parent matches dvino */
1186 if (!ceph_ino_compare(dir, pdvino))
1187 goto out_unlock;
1188
1189 /* make sure dentry's inode matches target. NULL ptvino means that
1190 * we expect a negative dentry */
1191 if (ptvino) {
1192 if (d_really_is_negative(dentry))
1193 goto out_unlock;
1194 if (!ceph_ino_compare(d_inode(dentry), ptvino))
1195 goto out_unlock;
1196 } else {
1197 if (d_really_is_positive(dentry))
1198 goto out_unlock;
1199 }
1200
1201 __update_dentry_lease(dir, dentry, lease, session,
1202 from_time, &old_lease_session);
1203out_unlock:
1204 spin_unlock(&dentry->d_lock);
1205 ceph_put_mds_session(old_lease_session);
1206}
1207
1208/*
1209 * splice a dentry to an inode.
1210 * caller must hold directory i_rwsem for this to be safe.
1211 */
1212static int splice_dentry(struct dentry **pdn, struct inode *in)
1213{
1214 struct dentry *dn = *pdn;
1215 struct dentry *realdn;
1216
1217 BUG_ON(d_inode(dn));
1218
1219 if (S_ISDIR(in->i_mode)) {
1220 /* If inode is directory, d_splice_alias() below will remove
1221 * 'realdn' from its origin parent. We need to ensure that
1222 * origin parent's readdir cache will not reference 'realdn'
1223 */
1224 realdn = d_find_any_alias(in);
1225 if (realdn) {
1226 struct ceph_dentry_info *di = ceph_dentry(realdn);
1227 spin_lock(&realdn->d_lock);
1228
1229 realdn->d_op->d_prune(realdn);
1230
1231 di->time = jiffies;
1232 di->lease_shared_gen = 0;
1233 di->offset = 0;
1234
1235 spin_unlock(&realdn->d_lock);
1236 dput(realdn);
1237 }
1238 }
1239
1240 /* dn must be unhashed */
1241 if (!d_unhashed(dn))
1242 d_drop(dn);
1243 realdn = d_splice_alias(in, dn);
1244 if (IS_ERR(realdn)) {
1245 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
1246 PTR_ERR(realdn), dn, in, ceph_vinop(in));
1247 return PTR_ERR(realdn);
1248 }
1249
1250 if (realdn) {
1251 dout("dn %p (%d) spliced with %p (%d) "
1252 "inode %p ino %llx.%llx\n",
1253 dn, d_count(dn),
1254 realdn, d_count(realdn),
1255 d_inode(realdn), ceph_vinop(d_inode(realdn)));
1256 dput(dn);
1257 *pdn = realdn;
1258 } else {
1259 BUG_ON(!ceph_dentry(dn));
1260 dout("dn %p attached to %p ino %llx.%llx\n",
1261 dn, d_inode(dn), ceph_vinop(d_inode(dn)));
1262 }
1263 return 0;
1264}
1265
1266/*
1267 * Incorporate results into the local cache. This is either just
1268 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1269 * after a lookup).
1270 *
1271 * A reply may contain
1272 * a directory inode along with a dentry.
1273 * and/or a target inode
1274 *
1275 * Called with snap_rwsem (read).
1276 */
1277int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
1278{
1279 struct ceph_mds_session *session = req->r_session;
1280 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1281 struct inode *in = NULL;
1282 struct ceph_vino tvino, dvino;
1283 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1284 int err = 0;
1285
1286 dout("fill_trace %p is_dentry %d is_target %d\n", req,
1287 rinfo->head->is_dentry, rinfo->head->is_target);
1288
1289 if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1290 dout("fill_trace reply is empty!\n");
1291 if (rinfo->head->result == 0 && req->r_parent)
1292 ceph_invalidate_dir_request(req);
1293 return 0;
1294 }
1295
1296 if (rinfo->head->is_dentry) {
1297 struct inode *dir = req->r_parent;
1298
1299 if (dir) {
1300 err = ceph_fill_inode(dir, NULL, &rinfo->diri,
1301 rinfo->dirfrag, session, -1,
1302 &req->r_caps_reservation);
1303 if (err < 0)
1304 goto done;
1305 } else {
1306 WARN_ON_ONCE(1);
1307 }
1308
1309 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME &&
1310 test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1311 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1312 struct qstr dname;
1313 struct dentry *dn, *parent;
1314
1315 BUG_ON(!rinfo->head->is_target);
1316 BUG_ON(req->r_dentry);
1317
1318 parent = d_find_any_alias(dir);
1319 BUG_ON(!parent);
1320
1321 dname.name = rinfo->dname;
1322 dname.len = rinfo->dname_len;
1323 dname.hash = full_name_hash(parent, dname.name, dname.len);
1324 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1325 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1326retry_lookup:
1327 dn = d_lookup(parent, &dname);
1328 dout("d_lookup on parent=%p name=%.*s got %p\n",
1329 parent, dname.len, dname.name, dn);
1330
1331 if (!dn) {
1332 dn = d_alloc(parent, &dname);
1333 dout("d_alloc %p '%.*s' = %p\n", parent,
1334 dname.len, dname.name, dn);
1335 if (!dn) {
1336 dput(parent);
1337 err = -ENOMEM;
1338 goto done;
1339 }
1340 err = 0;
1341 } else if (d_really_is_positive(dn) &&
1342 (ceph_ino(d_inode(dn)) != tvino.ino ||
1343 ceph_snap(d_inode(dn)) != tvino.snap)) {
1344 dout(" dn %p points to wrong inode %p\n",
1345 dn, d_inode(dn));
1346 ceph_dir_clear_ordered(dir);
1347 d_delete(dn);
1348 dput(dn);
1349 goto retry_lookup;
1350 }
1351
1352 req->r_dentry = dn;
1353 dput(parent);
1354 }
1355 }
1356
1357 if (rinfo->head->is_target) {
1358 /* Should be filled in by handle_reply */
1359 BUG_ON(!req->r_target_inode);
1360
1361 in = req->r_target_inode;
1362 err = ceph_fill_inode(in, req->r_locked_page, &rinfo->targeti,
1363 NULL, session,
1364 (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1365 !test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) &&
1366 rinfo->head->result == 0) ? req->r_fmode : -1,
1367 &req->r_caps_reservation);
1368 if (err < 0) {
1369 pr_err("ceph_fill_inode badness %p %llx.%llx\n",
1370 in, ceph_vinop(in));
1371 req->r_target_inode = NULL;
1372 if (in->i_state & I_NEW)
1373 discard_new_inode(in);
1374 else
1375 iput(in);
1376 goto done;
1377 }
1378 if (in->i_state & I_NEW)
1379 unlock_new_inode(in);
1380 }
1381
1382 /*
1383 * ignore null lease/binding on snapdir ENOENT, or else we
1384 * will have trouble splicing in the virtual snapdir later
1385 */
1386 if (rinfo->head->is_dentry &&
1387 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1388 test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1389 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1390 fsc->mount_options->snapdir_name,
1391 req->r_dentry->d_name.len))) {
1392 /*
1393 * lookup link rename : null -> possibly existing inode
1394 * mknod symlink mkdir : null -> new inode
1395 * unlink : linked -> null
1396 */
1397 struct inode *dir = req->r_parent;
1398 struct dentry *dn = req->r_dentry;
1399 bool have_dir_cap, have_lease;
1400
1401 BUG_ON(!dn);
1402 BUG_ON(!dir);
1403 BUG_ON(d_inode(dn->d_parent) != dir);
1404
1405 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1406 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1407
1408 BUG_ON(ceph_ino(dir) != dvino.ino);
1409 BUG_ON(ceph_snap(dir) != dvino.snap);
1410
1411 /* do we have a lease on the whole dir? */
1412 have_dir_cap =
1413 (le32_to_cpu(rinfo->diri.in->cap.caps) &
1414 CEPH_CAP_FILE_SHARED);
1415
1416 /* do we have a dn lease? */
1417 have_lease = have_dir_cap ||
1418 le32_to_cpu(rinfo->dlease->duration_ms);
1419 if (!have_lease)
1420 dout("fill_trace no dentry lease or dir cap\n");
1421
1422 /* rename? */
1423 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1424 struct inode *olddir = req->r_old_dentry_dir;
1425 BUG_ON(!olddir);
1426
1427 dout(" src %p '%pd' dst %p '%pd'\n",
1428 req->r_old_dentry,
1429 req->r_old_dentry,
1430 dn, dn);
1431 dout("fill_trace doing d_move %p -> %p\n",
1432 req->r_old_dentry, dn);
1433
1434 /* d_move screws up sibling dentries' offsets */
1435 ceph_dir_clear_ordered(dir);
1436 ceph_dir_clear_ordered(olddir);
1437
1438 d_move(req->r_old_dentry, dn);
1439 dout(" src %p '%pd' dst %p '%pd'\n",
1440 req->r_old_dentry,
1441 req->r_old_dentry,
1442 dn, dn);
1443
1444 /* ensure target dentry is invalidated, despite
1445 rehashing bug in vfs_rename_dir */
1446 ceph_invalidate_dentry_lease(dn);
1447
1448 dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1449 ceph_dentry(req->r_old_dentry)->offset);
1450
1451 /* swap r_dentry and r_old_dentry in case that
1452 * splice_dentry() gets called later. This is safe
1453 * because no other place will use them */
1454 req->r_dentry = req->r_old_dentry;
1455 req->r_old_dentry = dn;
1456 dn = req->r_dentry;
1457 }
1458
1459 /* null dentry? */
1460 if (!rinfo->head->is_target) {
1461 dout("fill_trace null dentry\n");
1462 if (d_really_is_positive(dn)) {
1463 dout("d_delete %p\n", dn);
1464 ceph_dir_clear_ordered(dir);
1465 d_delete(dn);
1466 } else if (have_lease) {
1467 if (d_unhashed(dn))
1468 d_add(dn, NULL);
1469 }
1470
1471 if (!d_unhashed(dn) && have_lease)
1472 update_dentry_lease(dir, dn,
1473 rinfo->dlease, session,
1474 req->r_request_started);
1475 goto done;
1476 }
1477
1478 /* attach proper inode */
1479 if (d_really_is_negative(dn)) {
1480 ceph_dir_clear_ordered(dir);
1481 ihold(in);
1482 err = splice_dentry(&req->r_dentry, in);
1483 if (err < 0)
1484 goto done;
1485 dn = req->r_dentry; /* may have spliced */
1486 } else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1487 dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1488 dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1489 ceph_vinop(in));
1490 d_invalidate(dn);
1491 have_lease = false;
1492 }
1493
1494 if (have_lease) {
1495 update_dentry_lease(dir, dn,
1496 rinfo->dlease, session,
1497 req->r_request_started);
1498 }
1499 dout(" final dn %p\n", dn);
1500 } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1501 req->r_op == CEPH_MDS_OP_MKSNAP) &&
1502 test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1503 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1504 struct inode *dir = req->r_parent;
1505
1506 /* fill out a snapdir LOOKUPSNAP dentry */
1507 BUG_ON(!dir);
1508 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1509 BUG_ON(!req->r_dentry);
1510 dout(" linking snapped dir %p to dn %p\n", in, req->r_dentry);
1511 ceph_dir_clear_ordered(dir);
1512 ihold(in);
1513 err = splice_dentry(&req->r_dentry, in);
1514 if (err < 0)
1515 goto done;
1516 } else if (rinfo->head->is_dentry && req->r_dentry) {
1517 /* parent inode is not locked, be carefull */
1518 struct ceph_vino *ptvino = NULL;
1519 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1520 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1521 if (rinfo->head->is_target) {
1522 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1523 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1524 ptvino = &tvino;
1525 }
1526 update_dentry_lease_careful(req->r_dentry, rinfo->dlease,
1527 session, req->r_request_started,
1528 rinfo->dname, rinfo->dname_len,
1529 &dvino, ptvino);
1530 }
1531done:
1532 dout("fill_trace done err=%d\n", err);
1533 return err;
1534}
1535
1536/*
1537 * Prepopulate our cache with readdir results, leases, etc.
1538 */
1539static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1540 struct ceph_mds_session *session)
1541{
1542 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1543 int i, err = 0;
1544
1545 for (i = 0; i < rinfo->dir_nr; i++) {
1546 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1547 struct ceph_vino vino;
1548 struct inode *in;
1549 int rc;
1550
1551 vino.ino = le64_to_cpu(rde->inode.in->ino);
1552 vino.snap = le64_to_cpu(rde->inode.in->snapid);
1553
1554 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1555 if (IS_ERR(in)) {
1556 err = PTR_ERR(in);
1557 dout("new_inode badness got %d\n", err);
1558 continue;
1559 }
1560 rc = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
1561 -1, &req->r_caps_reservation);
1562 if (rc < 0) {
1563 pr_err("ceph_fill_inode badness on %p got %d\n",
1564 in, rc);
1565 err = rc;
1566 if (in->i_state & I_NEW) {
1567 ihold(in);
1568 discard_new_inode(in);
1569 }
1570 } else if (in->i_state & I_NEW) {
1571 unlock_new_inode(in);
1572 }
1573
1574 iput(in);
1575 }
1576
1577 return err;
1578}
1579
1580void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1581{
1582 if (ctl->page) {
1583 kunmap(ctl->page);
1584 put_page(ctl->page);
1585 ctl->page = NULL;
1586 }
1587}
1588
1589static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1590 struct ceph_readdir_cache_control *ctl,
1591 struct ceph_mds_request *req)
1592{
1593 struct ceph_inode_info *ci = ceph_inode(dir);
1594 unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
1595 unsigned idx = ctl->index % nsize;
1596 pgoff_t pgoff = ctl->index / nsize;
1597
1598 if (!ctl->page || pgoff != page_index(ctl->page)) {
1599 ceph_readdir_cache_release(ctl);
1600 if (idx == 0)
1601 ctl->page = grab_cache_page(&dir->i_data, pgoff);
1602 else
1603 ctl->page = find_lock_page(&dir->i_data, pgoff);
1604 if (!ctl->page) {
1605 ctl->index = -1;
1606 return idx == 0 ? -ENOMEM : 0;
1607 }
1608 /* reading/filling the cache are serialized by
1609 * i_rwsem, no need to use page lock */
1610 unlock_page(ctl->page);
1611 ctl->dentries = kmap(ctl->page);
1612 if (idx == 0)
1613 memset(ctl->dentries, 0, PAGE_SIZE);
1614 }
1615
1616 if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1617 req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1618 dout("readdir cache dn %p idx %d\n", dn, ctl->index);
1619 ctl->dentries[idx] = dn;
1620 ctl->index++;
1621 } else {
1622 dout("disable readdir cache\n");
1623 ctl->index = -1;
1624 }
1625 return 0;
1626}
1627
1628int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1629 struct ceph_mds_session *session)
1630{
1631 struct dentry *parent = req->r_dentry;
1632 struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
1633 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1634 struct qstr dname;
1635 struct dentry *dn;
1636 struct inode *in;
1637 int err = 0, skipped = 0, ret, i;
1638 u32 frag = le32_to_cpu(req->r_args.readdir.frag);
1639 u32 last_hash = 0;
1640 u32 fpos_offset;
1641 struct ceph_readdir_cache_control cache_ctl = {};
1642
1643 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
1644 return readdir_prepopulate_inodes_only(req, session);
1645
1646 if (rinfo->hash_order) {
1647 if (req->r_path2) {
1648 last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1649 req->r_path2,
1650 strlen(req->r_path2));
1651 last_hash = ceph_frag_value(last_hash);
1652 } else if (rinfo->offset_hash) {
1653 /* mds understands offset_hash */
1654 WARN_ON_ONCE(req->r_readdir_offset != 2);
1655 last_hash = le32_to_cpu(req->r_args.readdir.offset_hash);
1656 }
1657 }
1658
1659 if (rinfo->dir_dir &&
1660 le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1661 dout("readdir_prepopulate got new frag %x -> %x\n",
1662 frag, le32_to_cpu(rinfo->dir_dir->frag));
1663 frag = le32_to_cpu(rinfo->dir_dir->frag);
1664 if (!rinfo->hash_order)
1665 req->r_readdir_offset = 2;
1666 }
1667
1668 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1669 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1670 rinfo->dir_nr, parent);
1671 } else {
1672 dout("readdir_prepopulate %d items under dn %p\n",
1673 rinfo->dir_nr, parent);
1674 if (rinfo->dir_dir)
1675 ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1676
1677 if (ceph_frag_is_leftmost(frag) &&
1678 req->r_readdir_offset == 2 &&
1679 !(rinfo->hash_order && last_hash)) {
1680 /* note dir version at start of readdir so we can
1681 * tell if any dentries get dropped */
1682 req->r_dir_release_cnt =
1683 atomic64_read(&ci->i_release_count);
1684 req->r_dir_ordered_cnt =
1685 atomic64_read(&ci->i_ordered_count);
1686 req->r_readdir_cache_idx = 0;
1687 }
1688 }
1689
1690 cache_ctl.index = req->r_readdir_cache_idx;
1691 fpos_offset = req->r_readdir_offset;
1692
1693 /* FIXME: release caps/leases if error occurs */
1694 for (i = 0; i < rinfo->dir_nr; i++) {
1695 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1696 struct ceph_vino tvino;
1697
1698 dname.name = rde->name;
1699 dname.len = rde->name_len;
1700 dname.hash = full_name_hash(parent, dname.name, dname.len);
1701
1702 tvino.ino = le64_to_cpu(rde->inode.in->ino);
1703 tvino.snap = le64_to_cpu(rde->inode.in->snapid);
1704
1705 if (rinfo->hash_order) {
1706 u32 hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1707 rde->name, rde->name_len);
1708 hash = ceph_frag_value(hash);
1709 if (hash != last_hash)
1710 fpos_offset = 2;
1711 last_hash = hash;
1712 rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
1713 } else {
1714 rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
1715 }
1716
1717retry_lookup:
1718 dn = d_lookup(parent, &dname);
1719 dout("d_lookup on parent=%p name=%.*s got %p\n",
1720 parent, dname.len, dname.name, dn);
1721
1722 if (!dn) {
1723 dn = d_alloc(parent, &dname);
1724 dout("d_alloc %p '%.*s' = %p\n", parent,
1725 dname.len, dname.name, dn);
1726 if (!dn) {
1727 dout("d_alloc badness\n");
1728 err = -ENOMEM;
1729 goto out;
1730 }
1731 } else if (d_really_is_positive(dn) &&
1732 (ceph_ino(d_inode(dn)) != tvino.ino ||
1733 ceph_snap(d_inode(dn)) != tvino.snap)) {
1734 struct ceph_dentry_info *di = ceph_dentry(dn);
1735 dout(" dn %p points to wrong inode %p\n",
1736 dn, d_inode(dn));
1737
1738 spin_lock(&dn->d_lock);
1739 if (di->offset > 0 &&
1740 di->lease_shared_gen ==
1741 atomic_read(&ci->i_shared_gen)) {
1742 __ceph_dir_clear_ordered(ci);
1743 di->offset = 0;
1744 }
1745 spin_unlock(&dn->d_lock);
1746
1747 d_delete(dn);
1748 dput(dn);
1749 goto retry_lookup;
1750 }
1751
1752 /* inode */
1753 if (d_really_is_positive(dn)) {
1754 in = d_inode(dn);
1755 } else {
1756 in = ceph_get_inode(parent->d_sb, tvino);
1757 if (IS_ERR(in)) {
1758 dout("new_inode badness\n");
1759 d_drop(dn);
1760 dput(dn);
1761 err = PTR_ERR(in);
1762 goto out;
1763 }
1764 }
1765
1766 ret = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
1767 -1, &req->r_caps_reservation);
1768 if (ret < 0) {
1769 pr_err("ceph_fill_inode badness on %p\n", in);
1770 if (d_really_is_negative(dn)) {
1771 if (in->i_state & I_NEW) {
1772 ihold(in);
1773 discard_new_inode(in);
1774 }
1775 iput(in);
1776 }
1777 d_drop(dn);
1778 err = ret;
1779 goto next_item;
1780 }
1781 if (in->i_state & I_NEW)
1782 unlock_new_inode(in);
1783
1784 if (d_really_is_negative(dn)) {
1785 if (ceph_security_xattr_deadlock(in)) {
1786 dout(" skip splicing dn %p to inode %p"
1787 " (security xattr deadlock)\n", dn, in);
1788 iput(in);
1789 skipped++;
1790 goto next_item;
1791 }
1792
1793 err = splice_dentry(&dn, in);
1794 if (err < 0)
1795 goto next_item;
1796 }
1797
1798 ceph_dentry(dn)->offset = rde->offset;
1799
1800 update_dentry_lease(d_inode(parent), dn,
1801 rde->lease, req->r_session,
1802 req->r_request_started);
1803
1804 if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
1805 ret = fill_readdir_cache(d_inode(parent), dn,
1806 &cache_ctl, req);
1807 if (ret < 0)
1808 err = ret;
1809 }
1810next_item:
1811 dput(dn);
1812 }
1813out:
1814 if (err == 0 && skipped == 0) {
1815 set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
1816 req->r_readdir_cache_idx = cache_ctl.index;
1817 }
1818 ceph_readdir_cache_release(&cache_ctl);
1819 dout("readdir_prepopulate done\n");
1820 return err;
1821}
1822
1823bool ceph_inode_set_size(struct inode *inode, loff_t size)
1824{
1825 struct ceph_inode_info *ci = ceph_inode(inode);
1826 bool ret;
1827
1828 spin_lock(&ci->i_ceph_lock);
1829 dout("set_size %p %llu -> %llu\n", inode, i_size_read(inode), size);
1830 i_size_write(inode, size);
1831 ceph_fscache_update(inode);
1832 inode->i_blocks = calc_inode_blocks(size);
1833
1834 ret = __ceph_should_report_size(ci);
1835
1836 spin_unlock(&ci->i_ceph_lock);
1837
1838 return ret;
1839}
1840
1841void ceph_queue_inode_work(struct inode *inode, int work_bit)
1842{
1843 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1844 struct ceph_inode_info *ci = ceph_inode(inode);
1845 set_bit(work_bit, &ci->i_work_mask);
1846
1847 ihold(inode);
1848 if (queue_work(fsc->inode_wq, &ci->i_work)) {
1849 dout("queue_inode_work %p, mask=%lx\n", inode, ci->i_work_mask);
1850 } else {
1851 dout("queue_inode_work %p already queued, mask=%lx\n",
1852 inode, ci->i_work_mask);
1853 iput(inode);
1854 }
1855}
1856
1857static void ceph_do_invalidate_pages(struct inode *inode)
1858{
1859 struct ceph_inode_info *ci = ceph_inode(inode);
1860 u32 orig_gen;
1861 int check = 0;
1862
1863 ceph_fscache_invalidate(inode, false);
1864
1865 mutex_lock(&ci->i_truncate_mutex);
1866
1867 if (ceph_inode_is_shutdown(inode)) {
1868 pr_warn_ratelimited("%s: inode %llx.%llx is shut down\n",
1869 __func__, ceph_vinop(inode));
1870 mapping_set_error(inode->i_mapping, -EIO);
1871 truncate_pagecache(inode, 0);
1872 mutex_unlock(&ci->i_truncate_mutex);
1873 goto out;
1874 }
1875
1876 spin_lock(&ci->i_ceph_lock);
1877 dout("invalidate_pages %p gen %d revoking %d\n", inode,
1878 ci->i_rdcache_gen, ci->i_rdcache_revoking);
1879 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1880 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1881 check = 1;
1882 spin_unlock(&ci->i_ceph_lock);
1883 mutex_unlock(&ci->i_truncate_mutex);
1884 goto out;
1885 }
1886 orig_gen = ci->i_rdcache_gen;
1887 spin_unlock(&ci->i_ceph_lock);
1888
1889 if (invalidate_inode_pages2(inode->i_mapping) < 0) {
1890 pr_err("invalidate_inode_pages2 %llx.%llx failed\n",
1891 ceph_vinop(inode));
1892 }
1893
1894 spin_lock(&ci->i_ceph_lock);
1895 if (orig_gen == ci->i_rdcache_gen &&
1896 orig_gen == ci->i_rdcache_revoking) {
1897 dout("invalidate_pages %p gen %d successful\n", inode,
1898 ci->i_rdcache_gen);
1899 ci->i_rdcache_revoking--;
1900 check = 1;
1901 } else {
1902 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1903 inode, orig_gen, ci->i_rdcache_gen,
1904 ci->i_rdcache_revoking);
1905 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1906 check = 1;
1907 }
1908 spin_unlock(&ci->i_ceph_lock);
1909 mutex_unlock(&ci->i_truncate_mutex);
1910out:
1911 if (check)
1912 ceph_check_caps(ci, 0);
1913}
1914
1915/*
1916 * Make sure any pending truncation is applied before doing anything
1917 * that may depend on it.
1918 */
1919void __ceph_do_pending_vmtruncate(struct inode *inode)
1920{
1921 struct ceph_inode_info *ci = ceph_inode(inode);
1922 u64 to;
1923 int wrbuffer_refs, finish = 0;
1924
1925 mutex_lock(&ci->i_truncate_mutex);
1926retry:
1927 spin_lock(&ci->i_ceph_lock);
1928 if (ci->i_truncate_pending == 0) {
1929 dout("__do_pending_vmtruncate %p none pending\n", inode);
1930 spin_unlock(&ci->i_ceph_lock);
1931 mutex_unlock(&ci->i_truncate_mutex);
1932 return;
1933 }
1934
1935 /*
1936 * make sure any dirty snapped pages are flushed before we
1937 * possibly truncate them.. so write AND block!
1938 */
1939 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1940 spin_unlock(&ci->i_ceph_lock);
1941 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1942 inode);
1943 filemap_write_and_wait_range(&inode->i_data, 0,
1944 inode->i_sb->s_maxbytes);
1945 goto retry;
1946 }
1947
1948 /* there should be no reader or writer */
1949 WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1950
1951 to = ci->i_truncate_size;
1952 wrbuffer_refs = ci->i_wrbuffer_ref;
1953 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1954 ci->i_truncate_pending, to);
1955 spin_unlock(&ci->i_ceph_lock);
1956
1957 ceph_fscache_resize(inode, to);
1958 truncate_pagecache(inode, to);
1959
1960 spin_lock(&ci->i_ceph_lock);
1961 if (to == ci->i_truncate_size) {
1962 ci->i_truncate_pending = 0;
1963 finish = 1;
1964 }
1965 spin_unlock(&ci->i_ceph_lock);
1966 if (!finish)
1967 goto retry;
1968
1969 mutex_unlock(&ci->i_truncate_mutex);
1970
1971 if (wrbuffer_refs == 0)
1972 ceph_check_caps(ci, 0);
1973
1974 wake_up_all(&ci->i_cap_wq);
1975}
1976
1977static void ceph_inode_work(struct work_struct *work)
1978{
1979 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1980 i_work);
1981 struct inode *inode = &ci->netfs.inode;
1982
1983 if (test_and_clear_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask)) {
1984 dout("writeback %p\n", inode);
1985 filemap_fdatawrite(&inode->i_data);
1986 }
1987 if (test_and_clear_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask))
1988 ceph_do_invalidate_pages(inode);
1989
1990 if (test_and_clear_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask))
1991 __ceph_do_pending_vmtruncate(inode);
1992
1993 if (test_and_clear_bit(CEPH_I_WORK_CHECK_CAPS, &ci->i_work_mask))
1994 ceph_check_caps(ci, 0);
1995
1996 if (test_and_clear_bit(CEPH_I_WORK_FLUSH_SNAPS, &ci->i_work_mask))
1997 ceph_flush_snaps(ci, NULL);
1998
1999 iput(inode);
2000}
2001
2002/*
2003 * symlinks
2004 */
2005static const struct inode_operations ceph_symlink_iops = {
2006 .get_link = simple_get_link,
2007 .setattr = ceph_setattr,
2008 .getattr = ceph_getattr,
2009 .listxattr = ceph_listxattr,
2010};
2011
2012int __ceph_setattr(struct inode *inode, struct iattr *attr)
2013{
2014 struct ceph_inode_info *ci = ceph_inode(inode);
2015 unsigned int ia_valid = attr->ia_valid;
2016 struct ceph_mds_request *req;
2017 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
2018 struct ceph_cap_flush *prealloc_cf;
2019 int issued;
2020 int release = 0, dirtied = 0;
2021 int mask = 0;
2022 int err = 0;
2023 int inode_dirty_flags = 0;
2024 bool lock_snap_rwsem = false;
2025
2026 prealloc_cf = ceph_alloc_cap_flush();
2027 if (!prealloc_cf)
2028 return -ENOMEM;
2029
2030 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
2031 USE_AUTH_MDS);
2032 if (IS_ERR(req)) {
2033 ceph_free_cap_flush(prealloc_cf);
2034 return PTR_ERR(req);
2035 }
2036
2037 spin_lock(&ci->i_ceph_lock);
2038 issued = __ceph_caps_issued(ci, NULL);
2039
2040 if (!ci->i_head_snapc &&
2041 (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
2042 lock_snap_rwsem = true;
2043 if (!down_read_trylock(&mdsc->snap_rwsem)) {
2044 spin_unlock(&ci->i_ceph_lock);
2045 down_read(&mdsc->snap_rwsem);
2046 spin_lock(&ci->i_ceph_lock);
2047 issued = __ceph_caps_issued(ci, NULL);
2048 }
2049 }
2050
2051 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
2052
2053 if (ia_valid & ATTR_UID) {
2054 dout("setattr %p uid %d -> %d\n", inode,
2055 from_kuid(&init_user_ns, inode->i_uid),
2056 from_kuid(&init_user_ns, attr->ia_uid));
2057 if (issued & CEPH_CAP_AUTH_EXCL) {
2058 inode->i_uid = attr->ia_uid;
2059 dirtied |= CEPH_CAP_AUTH_EXCL;
2060 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2061 !uid_eq(attr->ia_uid, inode->i_uid)) {
2062 req->r_args.setattr.uid = cpu_to_le32(
2063 from_kuid(&init_user_ns, attr->ia_uid));
2064 mask |= CEPH_SETATTR_UID;
2065 release |= CEPH_CAP_AUTH_SHARED;
2066 }
2067 }
2068 if (ia_valid & ATTR_GID) {
2069 dout("setattr %p gid %d -> %d\n", inode,
2070 from_kgid(&init_user_ns, inode->i_gid),
2071 from_kgid(&init_user_ns, attr->ia_gid));
2072 if (issued & CEPH_CAP_AUTH_EXCL) {
2073 inode->i_gid = attr->ia_gid;
2074 dirtied |= CEPH_CAP_AUTH_EXCL;
2075 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2076 !gid_eq(attr->ia_gid, inode->i_gid)) {
2077 req->r_args.setattr.gid = cpu_to_le32(
2078 from_kgid(&init_user_ns, attr->ia_gid));
2079 mask |= CEPH_SETATTR_GID;
2080 release |= CEPH_CAP_AUTH_SHARED;
2081 }
2082 }
2083 if (ia_valid & ATTR_MODE) {
2084 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
2085 attr->ia_mode);
2086 if (issued & CEPH_CAP_AUTH_EXCL) {
2087 inode->i_mode = attr->ia_mode;
2088 dirtied |= CEPH_CAP_AUTH_EXCL;
2089 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2090 attr->ia_mode != inode->i_mode) {
2091 inode->i_mode = attr->ia_mode;
2092 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
2093 mask |= CEPH_SETATTR_MODE;
2094 release |= CEPH_CAP_AUTH_SHARED;
2095 }
2096 }
2097
2098 if (ia_valid & ATTR_ATIME) {
2099 dout("setattr %p atime %lld.%ld -> %lld.%ld\n", inode,
2100 inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
2101 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
2102 if (issued & CEPH_CAP_FILE_EXCL) {
2103 ci->i_time_warp_seq++;
2104 inode->i_atime = attr->ia_atime;
2105 dirtied |= CEPH_CAP_FILE_EXCL;
2106 } else if ((issued & CEPH_CAP_FILE_WR) &&
2107 timespec64_compare(&inode->i_atime,
2108 &attr->ia_atime) < 0) {
2109 inode->i_atime = attr->ia_atime;
2110 dirtied |= CEPH_CAP_FILE_WR;
2111 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2112 !timespec64_equal(&inode->i_atime, &attr->ia_atime)) {
2113 ceph_encode_timespec64(&req->r_args.setattr.atime,
2114 &attr->ia_atime);
2115 mask |= CEPH_SETATTR_ATIME;
2116 release |= CEPH_CAP_FILE_SHARED |
2117 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2118 }
2119 }
2120 if (ia_valid & ATTR_SIZE) {
2121 loff_t isize = i_size_read(inode);
2122
2123 dout("setattr %p size %lld -> %lld\n", inode, isize, attr->ia_size);
2124 if ((issued & CEPH_CAP_FILE_EXCL) && attr->ia_size >= isize) {
2125 if (attr->ia_size > isize) {
2126 i_size_write(inode, attr->ia_size);
2127 inode->i_blocks = calc_inode_blocks(attr->ia_size);
2128 ci->i_reported_size = attr->ia_size;
2129 dirtied |= CEPH_CAP_FILE_EXCL;
2130 ia_valid |= ATTR_MTIME;
2131 }
2132 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2133 attr->ia_size != isize) {
2134 req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
2135 req->r_args.setattr.old_size = cpu_to_le64(isize);
2136 mask |= CEPH_SETATTR_SIZE;
2137 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2138 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2139 }
2140 }
2141 if (ia_valid & ATTR_MTIME) {
2142 dout("setattr %p mtime %lld.%ld -> %lld.%ld\n", inode,
2143 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
2144 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
2145 if (issued & CEPH_CAP_FILE_EXCL) {
2146 ci->i_time_warp_seq++;
2147 inode->i_mtime = attr->ia_mtime;
2148 dirtied |= CEPH_CAP_FILE_EXCL;
2149 } else if ((issued & CEPH_CAP_FILE_WR) &&
2150 timespec64_compare(&inode->i_mtime,
2151 &attr->ia_mtime) < 0) {
2152 inode->i_mtime = attr->ia_mtime;
2153 dirtied |= CEPH_CAP_FILE_WR;
2154 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2155 !timespec64_equal(&inode->i_mtime, &attr->ia_mtime)) {
2156 ceph_encode_timespec64(&req->r_args.setattr.mtime,
2157 &attr->ia_mtime);
2158 mask |= CEPH_SETATTR_MTIME;
2159 release |= CEPH_CAP_FILE_SHARED |
2160 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2161 }
2162 }
2163
2164 /* these do nothing */
2165 if (ia_valid & ATTR_CTIME) {
2166 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
2167 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
2168 dout("setattr %p ctime %lld.%ld -> %lld.%ld (%s)\n", inode,
2169 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
2170 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
2171 only ? "ctime only" : "ignored");
2172 if (only) {
2173 /*
2174 * if kernel wants to dirty ctime but nothing else,
2175 * we need to choose a cap to dirty under, or do
2176 * a almost-no-op setattr
2177 */
2178 if (issued & CEPH_CAP_AUTH_EXCL)
2179 dirtied |= CEPH_CAP_AUTH_EXCL;
2180 else if (issued & CEPH_CAP_FILE_EXCL)
2181 dirtied |= CEPH_CAP_FILE_EXCL;
2182 else if (issued & CEPH_CAP_XATTR_EXCL)
2183 dirtied |= CEPH_CAP_XATTR_EXCL;
2184 else
2185 mask |= CEPH_SETATTR_CTIME;
2186 }
2187 }
2188 if (ia_valid & ATTR_FILE)
2189 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
2190
2191 if (dirtied) {
2192 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
2193 &prealloc_cf);
2194 inode->i_ctime = attr->ia_ctime;
2195 inode_inc_iversion_raw(inode);
2196 }
2197
2198 release &= issued;
2199 spin_unlock(&ci->i_ceph_lock);
2200 if (lock_snap_rwsem)
2201 up_read(&mdsc->snap_rwsem);
2202
2203 if (inode_dirty_flags)
2204 __mark_inode_dirty(inode, inode_dirty_flags);
2205
2206 if (mask) {
2207 req->r_inode = inode;
2208 ihold(inode);
2209 req->r_inode_drop = release;
2210 req->r_args.setattr.mask = cpu_to_le32(mask);
2211 req->r_num_caps = 1;
2212 req->r_stamp = attr->ia_ctime;
2213 err = ceph_mdsc_do_request(mdsc, NULL, req);
2214 }
2215 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
2216 ceph_cap_string(dirtied), mask);
2217
2218 ceph_mdsc_put_request(req);
2219 ceph_free_cap_flush(prealloc_cf);
2220
2221 if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
2222 __ceph_do_pending_vmtruncate(inode);
2223
2224 return err;
2225}
2226
2227/*
2228 * setattr
2229 */
2230int ceph_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
2231 struct iattr *attr)
2232{
2233 struct inode *inode = d_inode(dentry);
2234 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
2235 int err;
2236
2237 if (ceph_snap(inode) != CEPH_NOSNAP)
2238 return -EROFS;
2239
2240 if (ceph_inode_is_shutdown(inode))
2241 return -ESTALE;
2242
2243 err = setattr_prepare(&init_user_ns, dentry, attr);
2244 if (err != 0)
2245 return err;
2246
2247 if ((attr->ia_valid & ATTR_SIZE) &&
2248 attr->ia_size > max(i_size_read(inode), fsc->max_file_size))
2249 return -EFBIG;
2250
2251 if ((attr->ia_valid & ATTR_SIZE) &&
2252 ceph_quota_is_max_bytes_exceeded(inode, attr->ia_size))
2253 return -EDQUOT;
2254
2255 err = __ceph_setattr(inode, attr);
2256
2257 if (err >= 0 && (attr->ia_valid & ATTR_MODE))
2258 err = posix_acl_chmod(&init_user_ns, dentry, attr->ia_mode);
2259
2260 return err;
2261}
2262
2263int ceph_try_to_choose_auth_mds(struct inode *inode, int mask)
2264{
2265 int issued = ceph_caps_issued(ceph_inode(inode));
2266
2267 /*
2268 * If any 'x' caps is issued we can just choose the auth MDS
2269 * instead of the random replica MDSes. Because only when the
2270 * Locker is in LOCK_EXEC state will the loner client could
2271 * get the 'x' caps. And if we send the getattr requests to
2272 * any replica MDS it must auth pin and tries to rdlock from
2273 * the auth MDS, and then the auth MDS need to do the Locker
2274 * state transition to LOCK_SYNC. And after that the lock state
2275 * will change back.
2276 *
2277 * This cost much when doing the Locker state transition and
2278 * usually will need to revoke caps from clients.
2279 *
2280 * And for the 'Xs' caps for getxattr we will also choose the
2281 * auth MDS, because the MDS side code is buggy due to setxattr
2282 * won't notify the replica MDSes when the values changed and
2283 * the replica MDS will return the old values. Though we will
2284 * fix it in MDS code, but this still makes sense for old ceph.
2285 */
2286 if (((mask & CEPH_CAP_ANY_SHARED) && (issued & CEPH_CAP_ANY_EXCL))
2287 || (mask & (CEPH_STAT_RSTAT | CEPH_STAT_CAP_XATTR)))
2288 return USE_AUTH_MDS;
2289 else
2290 return USE_ANY_MDS;
2291}
2292
2293/*
2294 * Verify that we have a lease on the given mask. If not,
2295 * do a getattr against an mds.
2296 */
2297int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2298 int mask, bool force)
2299{
2300 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2301 struct ceph_mds_client *mdsc = fsc->mdsc;
2302 struct ceph_mds_request *req;
2303 int mode;
2304 int err;
2305
2306 if (ceph_snap(inode) == CEPH_SNAPDIR) {
2307 dout("do_getattr inode %p SNAPDIR\n", inode);
2308 return 0;
2309 }
2310
2311 dout("do_getattr inode %p mask %s mode 0%o\n",
2312 inode, ceph_cap_string(mask), inode->i_mode);
2313 if (!force && ceph_caps_issued_mask_metric(ceph_inode(inode), mask, 1))
2314 return 0;
2315
2316 mode = ceph_try_to_choose_auth_mds(inode, mask);
2317 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
2318 if (IS_ERR(req))
2319 return PTR_ERR(req);
2320 req->r_inode = inode;
2321 ihold(inode);
2322 req->r_num_caps = 1;
2323 req->r_args.getattr.mask = cpu_to_le32(mask);
2324 req->r_locked_page = locked_page;
2325 err = ceph_mdsc_do_request(mdsc, NULL, req);
2326 if (locked_page && err == 0) {
2327 u64 inline_version = req->r_reply_info.targeti.inline_version;
2328 if (inline_version == 0) {
2329 /* the reply is supposed to contain inline data */
2330 err = -EINVAL;
2331 } else if (inline_version == CEPH_INLINE_NONE ||
2332 inline_version == 1) {
2333 err = -ENODATA;
2334 } else {
2335 err = req->r_reply_info.targeti.inline_len;
2336 }
2337 }
2338 ceph_mdsc_put_request(req);
2339 dout("do_getattr result=%d\n", err);
2340 return err;
2341}
2342
2343int ceph_do_getvxattr(struct inode *inode, const char *name, void *value,
2344 size_t size)
2345{
2346 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2347 struct ceph_mds_client *mdsc = fsc->mdsc;
2348 struct ceph_mds_request *req;
2349 int mode = USE_AUTH_MDS;
2350 int err;
2351 char *xattr_value;
2352 size_t xattr_value_len;
2353
2354 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETVXATTR, mode);
2355 if (IS_ERR(req)) {
2356 err = -ENOMEM;
2357 goto out;
2358 }
2359
2360 req->r_feature_needed = CEPHFS_FEATURE_OP_GETVXATTR;
2361 req->r_path2 = kstrdup(name, GFP_NOFS);
2362 if (!req->r_path2) {
2363 err = -ENOMEM;
2364 goto put;
2365 }
2366
2367 ihold(inode);
2368 req->r_inode = inode;
2369 err = ceph_mdsc_do_request(mdsc, NULL, req);
2370 if (err < 0)
2371 goto put;
2372
2373 xattr_value = req->r_reply_info.xattr_info.xattr_value;
2374 xattr_value_len = req->r_reply_info.xattr_info.xattr_value_len;
2375
2376 dout("do_getvxattr xattr_value_len:%zu, size:%zu\n", xattr_value_len, size);
2377
2378 err = (int)xattr_value_len;
2379 if (size == 0)
2380 goto put;
2381
2382 if (xattr_value_len > size) {
2383 err = -ERANGE;
2384 goto put;
2385 }
2386
2387 memcpy(value, xattr_value, xattr_value_len);
2388put:
2389 ceph_mdsc_put_request(req);
2390out:
2391 dout("do_getvxattr result=%d\n", err);
2392 return err;
2393}
2394
2395
2396/*
2397 * Check inode permissions. We verify we have a valid value for
2398 * the AUTH cap, then call the generic handler.
2399 */
2400int ceph_permission(struct user_namespace *mnt_userns, struct inode *inode,
2401 int mask)
2402{
2403 int err;
2404
2405 if (mask & MAY_NOT_BLOCK)
2406 return -ECHILD;
2407
2408 err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
2409
2410 if (!err)
2411 err = generic_permission(&init_user_ns, inode, mask);
2412 return err;
2413}
2414
2415/* Craft a mask of needed caps given a set of requested statx attrs. */
2416static int statx_to_caps(u32 want, umode_t mode)
2417{
2418 int mask = 0;
2419
2420 if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME|STATX_BTIME))
2421 mask |= CEPH_CAP_AUTH_SHARED;
2422
2423 if (want & (STATX_NLINK|STATX_CTIME)) {
2424 /*
2425 * The link count for directories depends on inode->i_subdirs,
2426 * and that is only updated when Fs caps are held.
2427 */
2428 if (S_ISDIR(mode))
2429 mask |= CEPH_CAP_FILE_SHARED;
2430 else
2431 mask |= CEPH_CAP_LINK_SHARED;
2432 }
2433
2434 if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE|
2435 STATX_BLOCKS))
2436 mask |= CEPH_CAP_FILE_SHARED;
2437
2438 if (want & (STATX_CTIME))
2439 mask |= CEPH_CAP_XATTR_SHARED;
2440
2441 return mask;
2442}
2443
2444/*
2445 * Get all the attributes. If we have sufficient caps for the requested attrs,
2446 * then we can avoid talking to the MDS at all.
2447 */
2448int ceph_getattr(struct user_namespace *mnt_userns, const struct path *path,
2449 struct kstat *stat, u32 request_mask, unsigned int flags)
2450{
2451 struct inode *inode = d_inode(path->dentry);
2452 struct super_block *sb = inode->i_sb;
2453 struct ceph_inode_info *ci = ceph_inode(inode);
2454 u32 valid_mask = STATX_BASIC_STATS;
2455 int err = 0;
2456
2457 if (ceph_inode_is_shutdown(inode))
2458 return -ESTALE;
2459
2460 /* Skip the getattr altogether if we're asked not to sync */
2461 if ((flags & AT_STATX_SYNC_TYPE) != AT_STATX_DONT_SYNC) {
2462 err = ceph_do_getattr(inode,
2463 statx_to_caps(request_mask, inode->i_mode),
2464 flags & AT_STATX_FORCE_SYNC);
2465 if (err)
2466 return err;
2467 }
2468
2469 generic_fillattr(&init_user_ns, inode, stat);
2470 stat->ino = ceph_present_inode(inode);
2471
2472 /*
2473 * btime on newly-allocated inodes is 0, so if this is still set to
2474 * that, then assume that it's not valid.
2475 */
2476 if (ci->i_btime.tv_sec || ci->i_btime.tv_nsec) {
2477 stat->btime = ci->i_btime;
2478 valid_mask |= STATX_BTIME;
2479 }
2480
2481 if (ceph_snap(inode) == CEPH_NOSNAP)
2482 stat->dev = sb->s_dev;
2483 else
2484 stat->dev = ci->i_snapid_map ? ci->i_snapid_map->dev : 0;
2485
2486 if (S_ISDIR(inode->i_mode)) {
2487 if (ceph_test_mount_opt(ceph_sb_to_client(sb), RBYTES)) {
2488 stat->size = ci->i_rbytes;
2489 } else if (ceph_snap(inode) == CEPH_SNAPDIR) {
2490 struct ceph_inode_info *pci;
2491 struct ceph_snap_realm *realm;
2492 struct inode *parent;
2493
2494 parent = ceph_lookup_inode(sb, ceph_ino(inode));
2495 if (IS_ERR(parent))
2496 return PTR_ERR(parent);
2497
2498 pci = ceph_inode(parent);
2499 spin_lock(&pci->i_ceph_lock);
2500 realm = pci->i_snap_realm;
2501 if (realm)
2502 stat->size = realm->num_snaps;
2503 else
2504 stat->size = 0;
2505 spin_unlock(&pci->i_ceph_lock);
2506 iput(parent);
2507 } else {
2508 stat->size = ci->i_files + ci->i_subdirs;
2509 }
2510 stat->blocks = 0;
2511 stat->blksize = 65536;
2512 /*
2513 * Some applications rely on the number of st_nlink
2514 * value on directories to be either 0 (if unlinked)
2515 * or 2 + number of subdirectories.
2516 */
2517 if (stat->nlink == 1)
2518 /* '.' + '..' + subdirs */
2519 stat->nlink = 1 + 1 + ci->i_subdirs;
2520 }
2521
2522 stat->result_mask = request_mask & valid_mask;
2523 return err;
2524}
2525
2526void ceph_inode_shutdown(struct inode *inode)
2527{
2528 struct ceph_inode_info *ci = ceph_inode(inode);
2529 struct rb_node *p;
2530 int iputs = 0;
2531 bool invalidate = false;
2532
2533 spin_lock(&ci->i_ceph_lock);
2534 ci->i_ceph_flags |= CEPH_I_SHUTDOWN;
2535 p = rb_first(&ci->i_caps);
2536 while (p) {
2537 struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node);
2538
2539 p = rb_next(p);
2540 iputs += ceph_purge_inode_cap(inode, cap, &invalidate);
2541 }
2542 spin_unlock(&ci->i_ceph_lock);
2543
2544 if (invalidate)
2545 ceph_queue_invalidate(inode);
2546 while (iputs--)
2547 iput(inode);
2548}