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Merge tag 'drm-misc-fixes-2017-08-18' of git://anongit.freedesktop.org/git/drm-misc...
[linux-2.6-block.git] / fs / ceph / inode.c
... / ...
CommitLineData
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/writeback.h>
10#include <linux/vmalloc.h>
11#include <linux/xattr.h>
12#include <linux/posix_acl.h>
13#include <linux/random.h>
14#include <linux/sort.h>
15
16#include "super.h"
17#include "mds_client.h"
18#include "cache.h"
19#include <linux/ceph/decode.h>
20
21/*
22 * Ceph inode operations
23 *
24 * Implement basic inode helpers (get, alloc) and inode ops (getattr,
25 * setattr, etc.), xattr helpers, and helpers for assimilating
26 * metadata returned by the MDS into our cache.
27 *
28 * Also define helpers for doing asynchronous writeback, invalidation,
29 * and truncation for the benefit of those who can't afford to block
30 * (typically because they are in the message handler path).
31 */
32
33static const struct inode_operations ceph_symlink_iops;
34
35static void ceph_invalidate_work(struct work_struct *work);
36static void ceph_writeback_work(struct work_struct *work);
37static void ceph_vmtruncate_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 ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
45 inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
46 return 0;
47}
48
49struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
50{
51 struct inode *inode;
52 ino_t t = ceph_vino_to_ino(vino);
53
54 inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
55 if (inode == NULL)
56 return ERR_PTR(-ENOMEM);
57 if (inode->i_state & I_NEW) {
58 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
59 inode, ceph_vinop(inode), (u64)inode->i_ino);
60 unlock_new_inode(inode);
61 }
62
63 dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
64 vino.snap, inode);
65 return inode;
66}
67
68/*
69 * get/constuct snapdir inode for a given directory
70 */
71struct inode *ceph_get_snapdir(struct inode *parent)
72{
73 struct ceph_vino vino = {
74 .ino = ceph_ino(parent),
75 .snap = CEPH_SNAPDIR,
76 };
77 struct inode *inode = ceph_get_inode(parent->i_sb, vino);
78 struct ceph_inode_info *ci = ceph_inode(inode);
79
80 BUG_ON(!S_ISDIR(parent->i_mode));
81 if (IS_ERR(inode))
82 return inode;
83 inode->i_mode = parent->i_mode;
84 inode->i_uid = parent->i_uid;
85 inode->i_gid = parent->i_gid;
86 inode->i_op = &ceph_snapdir_iops;
87 inode->i_fop = &ceph_snapdir_fops;
88 ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
89 ci->i_rbytes = 0;
90 return inode;
91}
92
93const struct inode_operations ceph_file_iops = {
94 .permission = ceph_permission,
95 .setattr = ceph_setattr,
96 .getattr = ceph_getattr,
97 .listxattr = ceph_listxattr,
98 .get_acl = ceph_get_acl,
99 .set_acl = ceph_set_acl,
100};
101
102
103/*
104 * We use a 'frag tree' to keep track of the MDS's directory fragments
105 * for a given inode (usually there is just a single fragment). We
106 * need to know when a child frag is delegated to a new MDS, or when
107 * it is flagged as replicated, so we can direct our requests
108 * accordingly.
109 */
110
111/*
112 * find/create a frag in the tree
113 */
114static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
115 u32 f)
116{
117 struct rb_node **p;
118 struct rb_node *parent = NULL;
119 struct ceph_inode_frag *frag;
120 int c;
121
122 p = &ci->i_fragtree.rb_node;
123 while (*p) {
124 parent = *p;
125 frag = rb_entry(parent, struct ceph_inode_frag, node);
126 c = ceph_frag_compare(f, frag->frag);
127 if (c < 0)
128 p = &(*p)->rb_left;
129 else if (c > 0)
130 p = &(*p)->rb_right;
131 else
132 return frag;
133 }
134
135 frag = kmalloc(sizeof(*frag), GFP_NOFS);
136 if (!frag) {
137 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
138 "frag %x\n", &ci->vfs_inode,
139 ceph_vinop(&ci->vfs_inode), f);
140 return ERR_PTR(-ENOMEM);
141 }
142 frag->frag = f;
143 frag->split_by = 0;
144 frag->mds = -1;
145 frag->ndist = 0;
146
147 rb_link_node(&frag->node, parent, p);
148 rb_insert_color(&frag->node, &ci->i_fragtree);
149
150 dout("get_or_create_frag added %llx.%llx frag %x\n",
151 ceph_vinop(&ci->vfs_inode), f);
152 return frag;
153}
154
155/*
156 * find a specific frag @f
157 */
158struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
159{
160 struct rb_node *n = ci->i_fragtree.rb_node;
161
162 while (n) {
163 struct ceph_inode_frag *frag =
164 rb_entry(n, struct ceph_inode_frag, node);
165 int c = ceph_frag_compare(f, frag->frag);
166 if (c < 0)
167 n = n->rb_left;
168 else if (c > 0)
169 n = n->rb_right;
170 else
171 return frag;
172 }
173 return NULL;
174}
175
176/*
177 * Choose frag containing the given value @v. If @pfrag is
178 * specified, copy the frag delegation info to the caller if
179 * it is present.
180 */
181static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
182 struct ceph_inode_frag *pfrag, int *found)
183{
184 u32 t = ceph_frag_make(0, 0);
185 struct ceph_inode_frag *frag;
186 unsigned nway, i;
187 u32 n;
188
189 if (found)
190 *found = 0;
191
192 while (1) {
193 WARN_ON(!ceph_frag_contains_value(t, v));
194 frag = __ceph_find_frag(ci, t);
195 if (!frag)
196 break; /* t is a leaf */
197 if (frag->split_by == 0) {
198 if (pfrag)
199 memcpy(pfrag, frag, sizeof(*pfrag));
200 if (found)
201 *found = 1;
202 break;
203 }
204
205 /* choose child */
206 nway = 1 << frag->split_by;
207 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
208 frag->split_by, nway);
209 for (i = 0; i < nway; i++) {
210 n = ceph_frag_make_child(t, frag->split_by, i);
211 if (ceph_frag_contains_value(n, v)) {
212 t = n;
213 break;
214 }
215 }
216 BUG_ON(i == nway);
217 }
218 dout("choose_frag(%x) = %x\n", v, t);
219
220 return t;
221}
222
223u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
224 struct ceph_inode_frag *pfrag, int *found)
225{
226 u32 ret;
227 mutex_lock(&ci->i_fragtree_mutex);
228 ret = __ceph_choose_frag(ci, v, pfrag, found);
229 mutex_unlock(&ci->i_fragtree_mutex);
230 return ret;
231}
232
233/*
234 * Process dirfrag (delegation) info from the mds. Include leaf
235 * fragment in tree ONLY if ndist > 0. Otherwise, only
236 * branches/splits are included in i_fragtree)
237 */
238static int ceph_fill_dirfrag(struct inode *inode,
239 struct ceph_mds_reply_dirfrag *dirinfo)
240{
241 struct ceph_inode_info *ci = ceph_inode(inode);
242 struct ceph_inode_frag *frag;
243 u32 id = le32_to_cpu(dirinfo->frag);
244 int mds = le32_to_cpu(dirinfo->auth);
245 int ndist = le32_to_cpu(dirinfo->ndist);
246 int diri_auth = -1;
247 int i;
248 int err = 0;
249
250 spin_lock(&ci->i_ceph_lock);
251 if (ci->i_auth_cap)
252 diri_auth = ci->i_auth_cap->mds;
253 spin_unlock(&ci->i_ceph_lock);
254
255 if (mds == -1) /* CDIR_AUTH_PARENT */
256 mds = diri_auth;
257
258 mutex_lock(&ci->i_fragtree_mutex);
259 if (ndist == 0 && mds == diri_auth) {
260 /* no delegation info needed. */
261 frag = __ceph_find_frag(ci, id);
262 if (!frag)
263 goto out;
264 if (frag->split_by == 0) {
265 /* tree leaf, remove */
266 dout("fill_dirfrag removed %llx.%llx frag %x"
267 " (no ref)\n", ceph_vinop(inode), id);
268 rb_erase(&frag->node, &ci->i_fragtree);
269 kfree(frag);
270 } else {
271 /* tree branch, keep and clear */
272 dout("fill_dirfrag cleared %llx.%llx frag %x"
273 " referral\n", ceph_vinop(inode), id);
274 frag->mds = -1;
275 frag->ndist = 0;
276 }
277 goto out;
278 }
279
280
281 /* find/add this frag to store mds delegation info */
282 frag = __get_or_create_frag(ci, id);
283 if (IS_ERR(frag)) {
284 /* this is not the end of the world; we can continue
285 with bad/inaccurate delegation info */
286 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
287 ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
288 err = -ENOMEM;
289 goto out;
290 }
291
292 frag->mds = mds;
293 frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
294 for (i = 0; i < frag->ndist; i++)
295 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
296 dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
297 ceph_vinop(inode), frag->frag, frag->ndist);
298
299out:
300 mutex_unlock(&ci->i_fragtree_mutex);
301 return err;
302}
303
304static int frag_tree_split_cmp(const void *l, const void *r)
305{
306 struct ceph_frag_tree_split *ls = (struct ceph_frag_tree_split*)l;
307 struct ceph_frag_tree_split *rs = (struct ceph_frag_tree_split*)r;
308 return ceph_frag_compare(le32_to_cpu(ls->frag),
309 le32_to_cpu(rs->frag));
310}
311
312static bool is_frag_child(u32 f, struct ceph_inode_frag *frag)
313{
314 if (!frag)
315 return f == ceph_frag_make(0, 0);
316 if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by)
317 return false;
318 return ceph_frag_contains_value(frag->frag, ceph_frag_value(f));
319}
320
321static int ceph_fill_fragtree(struct inode *inode,
322 struct ceph_frag_tree_head *fragtree,
323 struct ceph_mds_reply_dirfrag *dirinfo)
324{
325 struct ceph_inode_info *ci = ceph_inode(inode);
326 struct ceph_inode_frag *frag, *prev_frag = NULL;
327 struct rb_node *rb_node;
328 unsigned i, split_by, nsplits;
329 u32 id;
330 bool update = false;
331
332 mutex_lock(&ci->i_fragtree_mutex);
333 nsplits = le32_to_cpu(fragtree->nsplits);
334 if (nsplits != ci->i_fragtree_nsplits) {
335 update = true;
336 } else if (nsplits) {
337 i = prandom_u32() % nsplits;
338 id = le32_to_cpu(fragtree->splits[i].frag);
339 if (!__ceph_find_frag(ci, id))
340 update = true;
341 } else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) {
342 rb_node = rb_first(&ci->i_fragtree);
343 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
344 if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node))
345 update = true;
346 }
347 if (!update && dirinfo) {
348 id = le32_to_cpu(dirinfo->frag);
349 if (id != __ceph_choose_frag(ci, id, NULL, NULL))
350 update = true;
351 }
352 if (!update)
353 goto out_unlock;
354
355 if (nsplits > 1) {
356 sort(fragtree->splits, nsplits, sizeof(fragtree->splits[0]),
357 frag_tree_split_cmp, NULL);
358 }
359
360 dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode));
361 rb_node = rb_first(&ci->i_fragtree);
362 for (i = 0; i < nsplits; i++) {
363 id = le32_to_cpu(fragtree->splits[i].frag);
364 split_by = le32_to_cpu(fragtree->splits[i].by);
365 if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) {
366 pr_err("fill_fragtree %llx.%llx invalid split %d/%u, "
367 "frag %x split by %d\n", ceph_vinop(inode),
368 i, nsplits, id, split_by);
369 continue;
370 }
371 frag = NULL;
372 while (rb_node) {
373 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
374 if (ceph_frag_compare(frag->frag, id) >= 0) {
375 if (frag->frag != id)
376 frag = NULL;
377 else
378 rb_node = rb_next(rb_node);
379 break;
380 }
381 rb_node = rb_next(rb_node);
382 /* delete stale split/leaf node */
383 if (frag->split_by > 0 ||
384 !is_frag_child(frag->frag, prev_frag)) {
385 rb_erase(&frag->node, &ci->i_fragtree);
386 if (frag->split_by > 0)
387 ci->i_fragtree_nsplits--;
388 kfree(frag);
389 }
390 frag = NULL;
391 }
392 if (!frag) {
393 frag = __get_or_create_frag(ci, id);
394 if (IS_ERR(frag))
395 continue;
396 }
397 if (frag->split_by == 0)
398 ci->i_fragtree_nsplits++;
399 frag->split_by = split_by;
400 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
401 prev_frag = frag;
402 }
403 while (rb_node) {
404 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
405 rb_node = rb_next(rb_node);
406 /* delete stale split/leaf node */
407 if (frag->split_by > 0 ||
408 !is_frag_child(frag->frag, prev_frag)) {
409 rb_erase(&frag->node, &ci->i_fragtree);
410 if (frag->split_by > 0)
411 ci->i_fragtree_nsplits--;
412 kfree(frag);
413 }
414 }
415out_unlock:
416 mutex_unlock(&ci->i_fragtree_mutex);
417 return 0;
418}
419
420/*
421 * initialize a newly allocated inode.
422 */
423struct inode *ceph_alloc_inode(struct super_block *sb)
424{
425 struct ceph_inode_info *ci;
426 int i;
427
428 ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
429 if (!ci)
430 return NULL;
431
432 dout("alloc_inode %p\n", &ci->vfs_inode);
433
434 spin_lock_init(&ci->i_ceph_lock);
435
436 ci->i_version = 0;
437 ci->i_inline_version = 0;
438 ci->i_time_warp_seq = 0;
439 ci->i_ceph_flags = 0;
440 atomic64_set(&ci->i_ordered_count, 1);
441 atomic64_set(&ci->i_release_count, 1);
442 atomic64_set(&ci->i_complete_seq[0], 0);
443 atomic64_set(&ci->i_complete_seq[1], 0);
444 ci->i_symlink = NULL;
445
446 memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
447 RCU_INIT_POINTER(ci->i_layout.pool_ns, NULL);
448
449 ci->i_fragtree = RB_ROOT;
450 mutex_init(&ci->i_fragtree_mutex);
451
452 ci->i_xattrs.blob = NULL;
453 ci->i_xattrs.prealloc_blob = NULL;
454 ci->i_xattrs.dirty = false;
455 ci->i_xattrs.index = RB_ROOT;
456 ci->i_xattrs.count = 0;
457 ci->i_xattrs.names_size = 0;
458 ci->i_xattrs.vals_size = 0;
459 ci->i_xattrs.version = 0;
460 ci->i_xattrs.index_version = 0;
461
462 ci->i_caps = RB_ROOT;
463 ci->i_auth_cap = NULL;
464 ci->i_dirty_caps = 0;
465 ci->i_flushing_caps = 0;
466 INIT_LIST_HEAD(&ci->i_dirty_item);
467 INIT_LIST_HEAD(&ci->i_flushing_item);
468 ci->i_prealloc_cap_flush = NULL;
469 INIT_LIST_HEAD(&ci->i_cap_flush_list);
470 init_waitqueue_head(&ci->i_cap_wq);
471 ci->i_hold_caps_min = 0;
472 ci->i_hold_caps_max = 0;
473 INIT_LIST_HEAD(&ci->i_cap_delay_list);
474 INIT_LIST_HEAD(&ci->i_cap_snaps);
475 ci->i_head_snapc = NULL;
476 ci->i_snap_caps = 0;
477
478 for (i = 0; i < CEPH_FILE_MODE_BITS; i++)
479 ci->i_nr_by_mode[i] = 0;
480
481 mutex_init(&ci->i_truncate_mutex);
482 ci->i_truncate_seq = 0;
483 ci->i_truncate_size = 0;
484 ci->i_truncate_pending = 0;
485
486 ci->i_max_size = 0;
487 ci->i_reported_size = 0;
488 ci->i_wanted_max_size = 0;
489 ci->i_requested_max_size = 0;
490
491 ci->i_pin_ref = 0;
492 ci->i_rd_ref = 0;
493 ci->i_rdcache_ref = 0;
494 ci->i_wr_ref = 0;
495 ci->i_wb_ref = 0;
496 ci->i_wrbuffer_ref = 0;
497 ci->i_wrbuffer_ref_head = 0;
498 ci->i_shared_gen = 0;
499 ci->i_rdcache_gen = 0;
500 ci->i_rdcache_revoking = 0;
501
502 INIT_LIST_HEAD(&ci->i_unsafe_dirops);
503 INIT_LIST_HEAD(&ci->i_unsafe_iops);
504 spin_lock_init(&ci->i_unsafe_lock);
505
506 ci->i_snap_realm = NULL;
507 INIT_LIST_HEAD(&ci->i_snap_realm_item);
508 INIT_LIST_HEAD(&ci->i_snap_flush_item);
509
510 INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
511 INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
512
513 INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
514
515 ceph_fscache_inode_init(ci);
516
517 return &ci->vfs_inode;
518}
519
520static void ceph_i_callback(struct rcu_head *head)
521{
522 struct inode *inode = container_of(head, struct inode, i_rcu);
523 struct ceph_inode_info *ci = ceph_inode(inode);
524
525 kmem_cache_free(ceph_inode_cachep, ci);
526}
527
528void ceph_destroy_inode(struct inode *inode)
529{
530 struct ceph_inode_info *ci = ceph_inode(inode);
531 struct ceph_inode_frag *frag;
532 struct rb_node *n;
533
534 dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
535
536 ceph_fscache_unregister_inode_cookie(ci);
537
538 ceph_queue_caps_release(inode);
539
540 /*
541 * we may still have a snap_realm reference if there are stray
542 * caps in i_snap_caps.
543 */
544 if (ci->i_snap_realm) {
545 struct ceph_mds_client *mdsc =
546 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
547 struct ceph_snap_realm *realm = ci->i_snap_realm;
548
549 dout(" dropping residual ref to snap realm %p\n", realm);
550 spin_lock(&realm->inodes_with_caps_lock);
551 list_del_init(&ci->i_snap_realm_item);
552 spin_unlock(&realm->inodes_with_caps_lock);
553 ceph_put_snap_realm(mdsc, realm);
554 }
555
556 kfree(ci->i_symlink);
557 while ((n = rb_first(&ci->i_fragtree)) != NULL) {
558 frag = rb_entry(n, struct ceph_inode_frag, node);
559 rb_erase(n, &ci->i_fragtree);
560 kfree(frag);
561 }
562 ci->i_fragtree_nsplits = 0;
563
564 __ceph_destroy_xattrs(ci);
565 if (ci->i_xattrs.blob)
566 ceph_buffer_put(ci->i_xattrs.blob);
567 if (ci->i_xattrs.prealloc_blob)
568 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
569
570 ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns));
571
572 call_rcu(&inode->i_rcu, ceph_i_callback);
573}
574
575int ceph_drop_inode(struct inode *inode)
576{
577 /*
578 * Positve dentry and corresponding inode are always accompanied
579 * in MDS reply. So no need to keep inode in the cache after
580 * dropping all its aliases.
581 */
582 return 1;
583}
584
585static inline blkcnt_t calc_inode_blocks(u64 size)
586{
587 return (size + (1<<9) - 1) >> 9;
588}
589
590/*
591 * Helpers to fill in size, ctime, mtime, and atime. We have to be
592 * careful because either the client or MDS may have more up to date
593 * info, depending on which capabilities are held, and whether
594 * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime
595 * and size are monotonically increasing, except when utimes() or
596 * truncate() increments the corresponding _seq values.)
597 */
598int ceph_fill_file_size(struct inode *inode, int issued,
599 u32 truncate_seq, u64 truncate_size, u64 size)
600{
601 struct ceph_inode_info *ci = ceph_inode(inode);
602 int queue_trunc = 0;
603
604 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
605 (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
606 dout("size %lld -> %llu\n", inode->i_size, size);
607 if (size > 0 && S_ISDIR(inode->i_mode)) {
608 pr_err("fill_file_size non-zero size for directory\n");
609 size = 0;
610 }
611 i_size_write(inode, size);
612 inode->i_blocks = calc_inode_blocks(size);
613 ci->i_reported_size = size;
614 if (truncate_seq != ci->i_truncate_seq) {
615 dout("truncate_seq %u -> %u\n",
616 ci->i_truncate_seq, truncate_seq);
617 ci->i_truncate_seq = truncate_seq;
618
619 /* the MDS should have revoked these caps */
620 WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
621 CEPH_CAP_FILE_RD |
622 CEPH_CAP_FILE_WR |
623 CEPH_CAP_FILE_LAZYIO));
624 /*
625 * If we hold relevant caps, or in the case where we're
626 * not the only client referencing this file and we
627 * don't hold those caps, then we need to check whether
628 * the file is either opened or mmaped
629 */
630 if ((issued & (CEPH_CAP_FILE_CACHE|
631 CEPH_CAP_FILE_BUFFER)) ||
632 mapping_mapped(inode->i_mapping) ||
633 __ceph_caps_file_wanted(ci)) {
634 ci->i_truncate_pending++;
635 queue_trunc = 1;
636 }
637 }
638 }
639 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
640 ci->i_truncate_size != truncate_size) {
641 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
642 truncate_size);
643 ci->i_truncate_size = truncate_size;
644 }
645
646 if (queue_trunc)
647 ceph_fscache_invalidate(inode);
648
649 return queue_trunc;
650}
651
652void ceph_fill_file_time(struct inode *inode, int issued,
653 u64 time_warp_seq, struct timespec *ctime,
654 struct timespec *mtime, struct timespec *atime)
655{
656 struct ceph_inode_info *ci = ceph_inode(inode);
657 int warn = 0;
658
659 if (issued & (CEPH_CAP_FILE_EXCL|
660 CEPH_CAP_FILE_WR|
661 CEPH_CAP_FILE_BUFFER|
662 CEPH_CAP_AUTH_EXCL|
663 CEPH_CAP_XATTR_EXCL)) {
664 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
665 dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
666 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
667 ctime->tv_sec, ctime->tv_nsec);
668 inode->i_ctime = *ctime;
669 }
670 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
671 /* the MDS did a utimes() */
672 dout("mtime %ld.%09ld -> %ld.%09ld "
673 "tw %d -> %d\n",
674 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
675 mtime->tv_sec, mtime->tv_nsec,
676 ci->i_time_warp_seq, (int)time_warp_seq);
677
678 inode->i_mtime = *mtime;
679 inode->i_atime = *atime;
680 ci->i_time_warp_seq = time_warp_seq;
681 } else if (time_warp_seq == ci->i_time_warp_seq) {
682 /* nobody did utimes(); take the max */
683 if (timespec_compare(mtime, &inode->i_mtime) > 0) {
684 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
685 inode->i_mtime.tv_sec,
686 inode->i_mtime.tv_nsec,
687 mtime->tv_sec, mtime->tv_nsec);
688 inode->i_mtime = *mtime;
689 }
690 if (timespec_compare(atime, &inode->i_atime) > 0) {
691 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
692 inode->i_atime.tv_sec,
693 inode->i_atime.tv_nsec,
694 atime->tv_sec, atime->tv_nsec);
695 inode->i_atime = *atime;
696 }
697 } else if (issued & CEPH_CAP_FILE_EXCL) {
698 /* we did a utimes(); ignore mds values */
699 } else {
700 warn = 1;
701 }
702 } else {
703 /* we have no write|excl caps; whatever the MDS says is true */
704 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
705 inode->i_ctime = *ctime;
706 inode->i_mtime = *mtime;
707 inode->i_atime = *atime;
708 ci->i_time_warp_seq = time_warp_seq;
709 } else {
710 warn = 1;
711 }
712 }
713 if (warn) /* time_warp_seq shouldn't go backwards */
714 dout("%p mds time_warp_seq %llu < %u\n",
715 inode, time_warp_seq, ci->i_time_warp_seq);
716}
717
718/*
719 * Populate an inode based on info from mds. May be called on new or
720 * existing inodes.
721 */
722static int fill_inode(struct inode *inode, struct page *locked_page,
723 struct ceph_mds_reply_info_in *iinfo,
724 struct ceph_mds_reply_dirfrag *dirinfo,
725 struct ceph_mds_session *session,
726 unsigned long ttl_from, int cap_fmode,
727 struct ceph_cap_reservation *caps_reservation)
728{
729 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
730 struct ceph_mds_reply_inode *info = iinfo->in;
731 struct ceph_inode_info *ci = ceph_inode(inode);
732 int issued = 0, implemented, new_issued;
733 struct timespec mtime, atime, ctime;
734 struct ceph_buffer *xattr_blob = NULL;
735 struct ceph_string *pool_ns = NULL;
736 struct ceph_cap *new_cap = NULL;
737 int err = 0;
738 bool wake = false;
739 bool queue_trunc = false;
740 bool new_version = false;
741 bool fill_inline = false;
742
743 dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
744 inode, ceph_vinop(inode), le64_to_cpu(info->version),
745 ci->i_version);
746
747 /* prealloc new cap struct */
748 if (info->cap.caps && ceph_snap(inode) == CEPH_NOSNAP)
749 new_cap = ceph_get_cap(mdsc, caps_reservation);
750
751 /*
752 * prealloc xattr data, if it looks like we'll need it. only
753 * if len > 4 (meaning there are actually xattrs; the first 4
754 * bytes are the xattr count).
755 */
756 if (iinfo->xattr_len > 4) {
757 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
758 if (!xattr_blob)
759 pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
760 iinfo->xattr_len);
761 }
762
763 if (iinfo->pool_ns_len > 0)
764 pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data,
765 iinfo->pool_ns_len);
766
767 spin_lock(&ci->i_ceph_lock);
768
769 /*
770 * provided version will be odd if inode value is projected,
771 * even if stable. skip the update if we have newer stable
772 * info (ours>=theirs, e.g. due to racing mds replies), unless
773 * we are getting projected (unstable) info (in which case the
774 * version is odd, and we want ours>theirs).
775 * us them
776 * 2 2 skip
777 * 3 2 skip
778 * 3 3 update
779 */
780 if (ci->i_version == 0 ||
781 ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
782 le64_to_cpu(info->version) > (ci->i_version & ~1)))
783 new_version = true;
784
785 issued = __ceph_caps_issued(ci, &implemented);
786 issued |= implemented | __ceph_caps_dirty(ci);
787 new_issued = ~issued & le32_to_cpu(info->cap.caps);
788
789 /* update inode */
790 ci->i_version = le64_to_cpu(info->version);
791 inode->i_version++;
792 inode->i_rdev = le32_to_cpu(info->rdev);
793 inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
794
795 if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
796 (issued & CEPH_CAP_AUTH_EXCL) == 0) {
797 inode->i_mode = le32_to_cpu(info->mode);
798 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
799 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
800 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
801 from_kuid(&init_user_ns, inode->i_uid),
802 from_kgid(&init_user_ns, inode->i_gid));
803 }
804
805 if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
806 (issued & CEPH_CAP_LINK_EXCL) == 0)
807 set_nlink(inode, le32_to_cpu(info->nlink));
808
809 if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
810 /* be careful with mtime, atime, size */
811 ceph_decode_timespec(&atime, &info->atime);
812 ceph_decode_timespec(&mtime, &info->mtime);
813 ceph_decode_timespec(&ctime, &info->ctime);
814 ceph_fill_file_time(inode, issued,
815 le32_to_cpu(info->time_warp_seq),
816 &ctime, &mtime, &atime);
817 }
818
819 if (new_version ||
820 (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
821 s64 old_pool = ci->i_layout.pool_id;
822 struct ceph_string *old_ns;
823
824 ceph_file_layout_from_legacy(&ci->i_layout, &info->layout);
825 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
826 lockdep_is_held(&ci->i_ceph_lock));
827 rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns);
828
829 if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns)
830 ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
831
832 pool_ns = old_ns;
833
834 queue_trunc = ceph_fill_file_size(inode, issued,
835 le32_to_cpu(info->truncate_seq),
836 le64_to_cpu(info->truncate_size),
837 le64_to_cpu(info->size));
838 /* only update max_size on auth cap */
839 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
840 ci->i_max_size != le64_to_cpu(info->max_size)) {
841 dout("max_size %lld -> %llu\n", ci->i_max_size,
842 le64_to_cpu(info->max_size));
843 ci->i_max_size = le64_to_cpu(info->max_size);
844 }
845 }
846
847 /* xattrs */
848 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
849 if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL)) &&
850 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
851 if (ci->i_xattrs.blob)
852 ceph_buffer_put(ci->i_xattrs.blob);
853 ci->i_xattrs.blob = xattr_blob;
854 if (xattr_blob)
855 memcpy(ci->i_xattrs.blob->vec.iov_base,
856 iinfo->xattr_data, iinfo->xattr_len);
857 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
858 ceph_forget_all_cached_acls(inode);
859 xattr_blob = NULL;
860 }
861
862 inode->i_mapping->a_ops = &ceph_aops;
863
864 switch (inode->i_mode & S_IFMT) {
865 case S_IFIFO:
866 case S_IFBLK:
867 case S_IFCHR:
868 case S_IFSOCK:
869 init_special_inode(inode, inode->i_mode, inode->i_rdev);
870 inode->i_op = &ceph_file_iops;
871 break;
872 case S_IFREG:
873 inode->i_op = &ceph_file_iops;
874 inode->i_fop = &ceph_file_fops;
875 break;
876 case S_IFLNK:
877 inode->i_op = &ceph_symlink_iops;
878 if (!ci->i_symlink) {
879 u32 symlen = iinfo->symlink_len;
880 char *sym;
881
882 spin_unlock(&ci->i_ceph_lock);
883
884 if (symlen != i_size_read(inode)) {
885 pr_err("fill_inode %llx.%llx BAD symlink "
886 "size %lld\n", ceph_vinop(inode),
887 i_size_read(inode));
888 i_size_write(inode, symlen);
889 inode->i_blocks = calc_inode_blocks(symlen);
890 }
891
892 err = -ENOMEM;
893 sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
894 if (!sym)
895 goto out;
896
897 spin_lock(&ci->i_ceph_lock);
898 if (!ci->i_symlink)
899 ci->i_symlink = sym;
900 else
901 kfree(sym); /* lost a race */
902 }
903 inode->i_link = ci->i_symlink;
904 break;
905 case S_IFDIR:
906 inode->i_op = &ceph_dir_iops;
907 inode->i_fop = &ceph_dir_fops;
908
909 ci->i_dir_layout = iinfo->dir_layout;
910
911 ci->i_files = le64_to_cpu(info->files);
912 ci->i_subdirs = le64_to_cpu(info->subdirs);
913 ci->i_rbytes = le64_to_cpu(info->rbytes);
914 ci->i_rfiles = le64_to_cpu(info->rfiles);
915 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
916 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
917 break;
918 default:
919 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
920 ceph_vinop(inode), inode->i_mode);
921 }
922
923 /* were we issued a capability? */
924 if (info->cap.caps) {
925 if (ceph_snap(inode) == CEPH_NOSNAP) {
926 unsigned caps = le32_to_cpu(info->cap.caps);
927 ceph_add_cap(inode, session,
928 le64_to_cpu(info->cap.cap_id),
929 cap_fmode, caps,
930 le32_to_cpu(info->cap.wanted),
931 le32_to_cpu(info->cap.seq),
932 le32_to_cpu(info->cap.mseq),
933 le64_to_cpu(info->cap.realm),
934 info->cap.flags, &new_cap);
935
936 /* set dir completion flag? */
937 if (S_ISDIR(inode->i_mode) &&
938 ci->i_files == 0 && ci->i_subdirs == 0 &&
939 (caps & CEPH_CAP_FILE_SHARED) &&
940 (issued & CEPH_CAP_FILE_EXCL) == 0 &&
941 !__ceph_dir_is_complete(ci)) {
942 dout(" marking %p complete (empty)\n", inode);
943 i_size_write(inode, 0);
944 __ceph_dir_set_complete(ci,
945 atomic64_read(&ci->i_release_count),
946 atomic64_read(&ci->i_ordered_count));
947 }
948
949 wake = true;
950 } else {
951 dout(" %p got snap_caps %s\n", inode,
952 ceph_cap_string(le32_to_cpu(info->cap.caps)));
953 ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
954 if (cap_fmode >= 0)
955 __ceph_get_fmode(ci, cap_fmode);
956 }
957 } else if (cap_fmode >= 0) {
958 pr_warn("mds issued no caps on %llx.%llx\n",
959 ceph_vinop(inode));
960 __ceph_get_fmode(ci, cap_fmode);
961 }
962
963 if (iinfo->inline_version > 0 &&
964 iinfo->inline_version >= ci->i_inline_version) {
965 int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
966 ci->i_inline_version = iinfo->inline_version;
967 if (ci->i_inline_version != CEPH_INLINE_NONE &&
968 (locked_page ||
969 (le32_to_cpu(info->cap.caps) & cache_caps)))
970 fill_inline = true;
971 }
972
973 spin_unlock(&ci->i_ceph_lock);
974
975 if (fill_inline)
976 ceph_fill_inline_data(inode, locked_page,
977 iinfo->inline_data, iinfo->inline_len);
978
979 if (wake)
980 wake_up_all(&ci->i_cap_wq);
981
982 /* queue truncate if we saw i_size decrease */
983 if (queue_trunc)
984 ceph_queue_vmtruncate(inode);
985
986 /* populate frag tree */
987 if (S_ISDIR(inode->i_mode))
988 ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
989
990 /* update delegation info? */
991 if (dirinfo)
992 ceph_fill_dirfrag(inode, dirinfo);
993
994 err = 0;
995out:
996 if (new_cap)
997 ceph_put_cap(mdsc, new_cap);
998 if (xattr_blob)
999 ceph_buffer_put(xattr_blob);
1000 ceph_put_string(pool_ns);
1001 return err;
1002}
1003
1004/*
1005 * caller should hold session s_mutex.
1006 */
1007static void update_dentry_lease(struct dentry *dentry,
1008 struct ceph_mds_reply_lease *lease,
1009 struct ceph_mds_session *session,
1010 unsigned long from_time,
1011 struct ceph_vino *tgt_vino,
1012 struct ceph_vino *dir_vino)
1013{
1014 struct ceph_dentry_info *di = ceph_dentry(dentry);
1015 long unsigned duration = le32_to_cpu(lease->duration_ms);
1016 long unsigned ttl = from_time + (duration * HZ) / 1000;
1017 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
1018 struct inode *dir;
1019 struct ceph_mds_session *old_lease_session = NULL;
1020
1021 /*
1022 * Make sure dentry's inode matches tgt_vino. NULL tgt_vino means that
1023 * we expect a negative dentry.
1024 */
1025 if (!tgt_vino && d_really_is_positive(dentry))
1026 return;
1027
1028 if (tgt_vino && (d_really_is_negative(dentry) ||
1029 !ceph_ino_compare(d_inode(dentry), tgt_vino)))
1030 return;
1031
1032 spin_lock(&dentry->d_lock);
1033 dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
1034 dentry, duration, ttl);
1035
1036 dir = d_inode(dentry->d_parent);
1037
1038 /* make sure parent matches dir_vino */
1039 if (!ceph_ino_compare(dir, dir_vino))
1040 goto out_unlock;
1041
1042 /* only track leases on regular dentries */
1043 if (ceph_snap(dir) != CEPH_NOSNAP)
1044 goto out_unlock;
1045
1046 di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
1047
1048 if (duration == 0)
1049 goto out_unlock;
1050
1051 if (di->lease_gen == session->s_cap_gen &&
1052 time_before(ttl, di->time))
1053 goto out_unlock; /* we already have a newer lease. */
1054
1055 if (di->lease_session && di->lease_session != session) {
1056 old_lease_session = di->lease_session;
1057 di->lease_session = NULL;
1058 }
1059
1060 ceph_dentry_lru_touch(dentry);
1061
1062 if (!di->lease_session)
1063 di->lease_session = ceph_get_mds_session(session);
1064 di->lease_gen = session->s_cap_gen;
1065 di->lease_seq = le32_to_cpu(lease->seq);
1066 di->lease_renew_after = half_ttl;
1067 di->lease_renew_from = 0;
1068 di->time = ttl;
1069out_unlock:
1070 spin_unlock(&dentry->d_lock);
1071 if (old_lease_session)
1072 ceph_put_mds_session(old_lease_session);
1073 return;
1074}
1075
1076/*
1077 * splice a dentry to an inode.
1078 * caller must hold directory i_mutex for this to be safe.
1079 */
1080static struct dentry *splice_dentry(struct dentry *dn, struct inode *in)
1081{
1082 struct dentry *realdn;
1083
1084 BUG_ON(d_inode(dn));
1085
1086 /* dn must be unhashed */
1087 if (!d_unhashed(dn))
1088 d_drop(dn);
1089 realdn = d_splice_alias(in, dn);
1090 if (IS_ERR(realdn)) {
1091 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
1092 PTR_ERR(realdn), dn, in, ceph_vinop(in));
1093 dn = realdn; /* note realdn contains the error */
1094 goto out;
1095 } else if (realdn) {
1096 dout("dn %p (%d) spliced with %p (%d) "
1097 "inode %p ino %llx.%llx\n",
1098 dn, d_count(dn),
1099 realdn, d_count(realdn),
1100 d_inode(realdn), ceph_vinop(d_inode(realdn)));
1101 dput(dn);
1102 dn = realdn;
1103 } else {
1104 BUG_ON(!ceph_dentry(dn));
1105 dout("dn %p attached to %p ino %llx.%llx\n",
1106 dn, d_inode(dn), ceph_vinop(d_inode(dn)));
1107 }
1108out:
1109 return dn;
1110}
1111
1112/*
1113 * Incorporate results into the local cache. This is either just
1114 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1115 * after a lookup).
1116 *
1117 * A reply may contain
1118 * a directory inode along with a dentry.
1119 * and/or a target inode
1120 *
1121 * Called with snap_rwsem (read).
1122 */
1123int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
1124{
1125 struct ceph_mds_session *session = req->r_session;
1126 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1127 struct inode *in = NULL;
1128 struct ceph_vino tvino, dvino;
1129 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1130 int err = 0;
1131
1132 dout("fill_trace %p is_dentry %d is_target %d\n", req,
1133 rinfo->head->is_dentry, rinfo->head->is_target);
1134
1135 if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1136 dout("fill_trace reply is empty!\n");
1137 if (rinfo->head->result == 0 && req->r_parent)
1138 ceph_invalidate_dir_request(req);
1139 return 0;
1140 }
1141
1142 if (rinfo->head->is_dentry) {
1143 struct inode *dir = req->r_parent;
1144
1145 if (dir) {
1146 err = fill_inode(dir, NULL,
1147 &rinfo->diri, rinfo->dirfrag,
1148 session, req->r_request_started, -1,
1149 &req->r_caps_reservation);
1150 if (err < 0)
1151 goto done;
1152 } else {
1153 WARN_ON_ONCE(1);
1154 }
1155
1156 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME) {
1157 struct qstr dname;
1158 struct dentry *dn, *parent;
1159
1160 BUG_ON(!rinfo->head->is_target);
1161 BUG_ON(req->r_dentry);
1162
1163 parent = d_find_any_alias(dir);
1164 BUG_ON(!parent);
1165
1166 dname.name = rinfo->dname;
1167 dname.len = rinfo->dname_len;
1168 dname.hash = full_name_hash(parent, dname.name, dname.len);
1169 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1170 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1171retry_lookup:
1172 dn = d_lookup(parent, &dname);
1173 dout("d_lookup on parent=%p name=%.*s got %p\n",
1174 parent, dname.len, dname.name, dn);
1175
1176 if (!dn) {
1177 dn = d_alloc(parent, &dname);
1178 dout("d_alloc %p '%.*s' = %p\n", parent,
1179 dname.len, dname.name, dn);
1180 if (dn == NULL) {
1181 dput(parent);
1182 err = -ENOMEM;
1183 goto done;
1184 }
1185 err = 0;
1186 } else if (d_really_is_positive(dn) &&
1187 (ceph_ino(d_inode(dn)) != tvino.ino ||
1188 ceph_snap(d_inode(dn)) != tvino.snap)) {
1189 dout(" dn %p points to wrong inode %p\n",
1190 dn, d_inode(dn));
1191 d_delete(dn);
1192 dput(dn);
1193 goto retry_lookup;
1194 }
1195
1196 req->r_dentry = dn;
1197 dput(parent);
1198 }
1199 }
1200
1201 if (rinfo->head->is_target) {
1202 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1203 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1204
1205 in = ceph_get_inode(sb, tvino);
1206 if (IS_ERR(in)) {
1207 err = PTR_ERR(in);
1208 goto done;
1209 }
1210 req->r_target_inode = in;
1211
1212 err = fill_inode(in, req->r_locked_page, &rinfo->targeti, NULL,
1213 session, req->r_request_started,
1214 (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1215 rinfo->head->result == 0) ? req->r_fmode : -1,
1216 &req->r_caps_reservation);
1217 if (err < 0) {
1218 pr_err("fill_inode badness %p %llx.%llx\n",
1219 in, ceph_vinop(in));
1220 goto done;
1221 }
1222 }
1223
1224 /*
1225 * ignore null lease/binding on snapdir ENOENT, or else we
1226 * will have trouble splicing in the virtual snapdir later
1227 */
1228 if (rinfo->head->is_dentry &&
1229 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1230 test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1231 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1232 fsc->mount_options->snapdir_name,
1233 req->r_dentry->d_name.len))) {
1234 /*
1235 * lookup link rename : null -> possibly existing inode
1236 * mknod symlink mkdir : null -> new inode
1237 * unlink : linked -> null
1238 */
1239 struct inode *dir = req->r_parent;
1240 struct dentry *dn = req->r_dentry;
1241 bool have_dir_cap, have_lease;
1242
1243 BUG_ON(!dn);
1244 BUG_ON(!dir);
1245 BUG_ON(d_inode(dn->d_parent) != dir);
1246
1247 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1248 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1249
1250 BUG_ON(ceph_ino(dir) != dvino.ino);
1251 BUG_ON(ceph_snap(dir) != dvino.snap);
1252
1253 /* do we have a lease on the whole dir? */
1254 have_dir_cap =
1255 (le32_to_cpu(rinfo->diri.in->cap.caps) &
1256 CEPH_CAP_FILE_SHARED);
1257
1258 /* do we have a dn lease? */
1259 have_lease = have_dir_cap ||
1260 le32_to_cpu(rinfo->dlease->duration_ms);
1261 if (!have_lease)
1262 dout("fill_trace no dentry lease or dir cap\n");
1263
1264 /* rename? */
1265 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1266 struct inode *olddir = req->r_old_dentry_dir;
1267 BUG_ON(!olddir);
1268
1269 dout(" src %p '%pd' dst %p '%pd'\n",
1270 req->r_old_dentry,
1271 req->r_old_dentry,
1272 dn, dn);
1273 dout("fill_trace doing d_move %p -> %p\n",
1274 req->r_old_dentry, dn);
1275
1276 /* d_move screws up sibling dentries' offsets */
1277 ceph_dir_clear_ordered(dir);
1278 ceph_dir_clear_ordered(olddir);
1279
1280 d_move(req->r_old_dentry, dn);
1281 dout(" src %p '%pd' dst %p '%pd'\n",
1282 req->r_old_dentry,
1283 req->r_old_dentry,
1284 dn, dn);
1285
1286 /* ensure target dentry is invalidated, despite
1287 rehashing bug in vfs_rename_dir */
1288 ceph_invalidate_dentry_lease(dn);
1289
1290 dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1291 ceph_dentry(req->r_old_dentry)->offset);
1292
1293 dn = req->r_old_dentry; /* use old_dentry */
1294 }
1295
1296 /* null dentry? */
1297 if (!rinfo->head->is_target) {
1298 dout("fill_trace null dentry\n");
1299 if (d_really_is_positive(dn)) {
1300 ceph_dir_clear_ordered(dir);
1301 dout("d_delete %p\n", dn);
1302 d_delete(dn);
1303 } else if (have_lease) {
1304 if (d_unhashed(dn))
1305 d_add(dn, NULL);
1306 update_dentry_lease(dn, rinfo->dlease,
1307 session,
1308 req->r_request_started,
1309 NULL, &dvino);
1310 }
1311 goto done;
1312 }
1313
1314 /* attach proper inode */
1315 if (d_really_is_negative(dn)) {
1316 ceph_dir_clear_ordered(dir);
1317 ihold(in);
1318 dn = splice_dentry(dn, in);
1319 if (IS_ERR(dn)) {
1320 err = PTR_ERR(dn);
1321 goto done;
1322 }
1323 req->r_dentry = dn; /* may have spliced */
1324 } else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1325 dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1326 dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1327 ceph_vinop(in));
1328 d_invalidate(dn);
1329 have_lease = false;
1330 }
1331
1332 if (have_lease) {
1333 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1334 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1335 update_dentry_lease(dn, rinfo->dlease, session,
1336 req->r_request_started,
1337 &tvino, &dvino);
1338 }
1339 dout(" final dn %p\n", dn);
1340 } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1341 req->r_op == CEPH_MDS_OP_MKSNAP) &&
1342 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1343 struct dentry *dn = req->r_dentry;
1344 struct inode *dir = req->r_parent;
1345
1346 /* fill out a snapdir LOOKUPSNAP dentry */
1347 BUG_ON(!dn);
1348 BUG_ON(!dir);
1349 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1350 dout(" linking snapped dir %p to dn %p\n", in, dn);
1351 ceph_dir_clear_ordered(dir);
1352 ihold(in);
1353 dn = splice_dentry(dn, in);
1354 if (IS_ERR(dn)) {
1355 err = PTR_ERR(dn);
1356 goto done;
1357 }
1358 req->r_dentry = dn; /* may have spliced */
1359 } else if (rinfo->head->is_dentry) {
1360 struct ceph_vino *ptvino = NULL;
1361
1362 if ((le32_to_cpu(rinfo->diri.in->cap.caps) & CEPH_CAP_FILE_SHARED) ||
1363 le32_to_cpu(rinfo->dlease->duration_ms)) {
1364 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1365 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1366
1367 if (rinfo->head->is_target) {
1368 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1369 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1370 ptvino = &tvino;
1371 }
1372
1373 update_dentry_lease(req->r_dentry, rinfo->dlease,
1374 session, req->r_request_started, ptvino,
1375 &dvino);
1376 } else {
1377 dout("%s: no dentry lease or dir cap\n", __func__);
1378 }
1379 }
1380done:
1381 dout("fill_trace done err=%d\n", err);
1382 return err;
1383}
1384
1385/*
1386 * Prepopulate our cache with readdir results, leases, etc.
1387 */
1388static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1389 struct ceph_mds_session *session)
1390{
1391 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1392 int i, err = 0;
1393
1394 for (i = 0; i < rinfo->dir_nr; i++) {
1395 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1396 struct ceph_vino vino;
1397 struct inode *in;
1398 int rc;
1399
1400 vino.ino = le64_to_cpu(rde->inode.in->ino);
1401 vino.snap = le64_to_cpu(rde->inode.in->snapid);
1402
1403 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1404 if (IS_ERR(in)) {
1405 err = PTR_ERR(in);
1406 dout("new_inode badness got %d\n", err);
1407 continue;
1408 }
1409 rc = fill_inode(in, NULL, &rde->inode, NULL, session,
1410 req->r_request_started, -1,
1411 &req->r_caps_reservation);
1412 if (rc < 0) {
1413 pr_err("fill_inode badness on %p got %d\n", in, rc);
1414 err = rc;
1415 }
1416 iput(in);
1417 }
1418
1419 return err;
1420}
1421
1422void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1423{
1424 if (ctl->page) {
1425 kunmap(ctl->page);
1426 put_page(ctl->page);
1427 ctl->page = NULL;
1428 }
1429}
1430
1431static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1432 struct ceph_readdir_cache_control *ctl,
1433 struct ceph_mds_request *req)
1434{
1435 struct ceph_inode_info *ci = ceph_inode(dir);
1436 unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
1437 unsigned idx = ctl->index % nsize;
1438 pgoff_t pgoff = ctl->index / nsize;
1439
1440 if (!ctl->page || pgoff != page_index(ctl->page)) {
1441 ceph_readdir_cache_release(ctl);
1442 if (idx == 0)
1443 ctl->page = grab_cache_page(&dir->i_data, pgoff);
1444 else
1445 ctl->page = find_lock_page(&dir->i_data, pgoff);
1446 if (!ctl->page) {
1447 ctl->index = -1;
1448 return idx == 0 ? -ENOMEM : 0;
1449 }
1450 /* reading/filling the cache are serialized by
1451 * i_mutex, no need to use page lock */
1452 unlock_page(ctl->page);
1453 ctl->dentries = kmap(ctl->page);
1454 if (idx == 0)
1455 memset(ctl->dentries, 0, PAGE_SIZE);
1456 }
1457
1458 if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1459 req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1460 dout("readdir cache dn %p idx %d\n", dn, ctl->index);
1461 ctl->dentries[idx] = dn;
1462 ctl->index++;
1463 } else {
1464 dout("disable readdir cache\n");
1465 ctl->index = -1;
1466 }
1467 return 0;
1468}
1469
1470int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1471 struct ceph_mds_session *session)
1472{
1473 struct dentry *parent = req->r_dentry;
1474 struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
1475 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1476 struct qstr dname;
1477 struct dentry *dn;
1478 struct inode *in;
1479 int err = 0, skipped = 0, ret, i;
1480 struct inode *snapdir = NULL;
1481 struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1482 u32 frag = le32_to_cpu(rhead->args.readdir.frag);
1483 u32 last_hash = 0;
1484 u32 fpos_offset;
1485 struct ceph_readdir_cache_control cache_ctl = {};
1486
1487 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
1488 return readdir_prepopulate_inodes_only(req, session);
1489
1490 if (rinfo->hash_order) {
1491 if (req->r_path2) {
1492 last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1493 req->r_path2,
1494 strlen(req->r_path2));
1495 last_hash = ceph_frag_value(last_hash);
1496 } else if (rinfo->offset_hash) {
1497 /* mds understands offset_hash */
1498 WARN_ON_ONCE(req->r_readdir_offset != 2);
1499 last_hash = le32_to_cpu(rhead->args.readdir.offset_hash);
1500 }
1501 }
1502
1503 if (rinfo->dir_dir &&
1504 le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1505 dout("readdir_prepopulate got new frag %x -> %x\n",
1506 frag, le32_to_cpu(rinfo->dir_dir->frag));
1507 frag = le32_to_cpu(rinfo->dir_dir->frag);
1508 if (!rinfo->hash_order)
1509 req->r_readdir_offset = 2;
1510 }
1511
1512 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1513 snapdir = ceph_get_snapdir(d_inode(parent));
1514 parent = d_find_alias(snapdir);
1515 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1516 rinfo->dir_nr, parent);
1517 } else {
1518 dout("readdir_prepopulate %d items under dn %p\n",
1519 rinfo->dir_nr, parent);
1520 if (rinfo->dir_dir)
1521 ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1522 }
1523
1524 if (ceph_frag_is_leftmost(frag) && req->r_readdir_offset == 2 &&
1525 !(rinfo->hash_order && last_hash)) {
1526 /* note dir version at start of readdir so we can tell
1527 * if any dentries get dropped */
1528 req->r_dir_release_cnt = atomic64_read(&ci->i_release_count);
1529 req->r_dir_ordered_cnt = atomic64_read(&ci->i_ordered_count);
1530 req->r_readdir_cache_idx = 0;
1531 }
1532
1533 cache_ctl.index = req->r_readdir_cache_idx;
1534 fpos_offset = req->r_readdir_offset;
1535
1536 /* FIXME: release caps/leases if error occurs */
1537 for (i = 0; i < rinfo->dir_nr; i++) {
1538 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1539 struct ceph_vino tvino, dvino;
1540
1541 dname.name = rde->name;
1542 dname.len = rde->name_len;
1543 dname.hash = full_name_hash(parent, dname.name, dname.len);
1544
1545 tvino.ino = le64_to_cpu(rde->inode.in->ino);
1546 tvino.snap = le64_to_cpu(rde->inode.in->snapid);
1547
1548 if (rinfo->hash_order) {
1549 u32 hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1550 rde->name, rde->name_len);
1551 hash = ceph_frag_value(hash);
1552 if (hash != last_hash)
1553 fpos_offset = 2;
1554 last_hash = hash;
1555 rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
1556 } else {
1557 rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
1558 }
1559
1560retry_lookup:
1561 dn = d_lookup(parent, &dname);
1562 dout("d_lookup on parent=%p name=%.*s got %p\n",
1563 parent, dname.len, dname.name, dn);
1564
1565 if (!dn) {
1566 dn = d_alloc(parent, &dname);
1567 dout("d_alloc %p '%.*s' = %p\n", parent,
1568 dname.len, dname.name, dn);
1569 if (dn == NULL) {
1570 dout("d_alloc badness\n");
1571 err = -ENOMEM;
1572 goto out;
1573 }
1574 } else if (d_really_is_positive(dn) &&
1575 (ceph_ino(d_inode(dn)) != tvino.ino ||
1576 ceph_snap(d_inode(dn)) != tvino.snap)) {
1577 dout(" dn %p points to wrong inode %p\n",
1578 dn, d_inode(dn));
1579 d_delete(dn);
1580 dput(dn);
1581 goto retry_lookup;
1582 }
1583
1584 /* inode */
1585 if (d_really_is_positive(dn)) {
1586 in = d_inode(dn);
1587 } else {
1588 in = ceph_get_inode(parent->d_sb, tvino);
1589 if (IS_ERR(in)) {
1590 dout("new_inode badness\n");
1591 d_drop(dn);
1592 dput(dn);
1593 err = PTR_ERR(in);
1594 goto out;
1595 }
1596 }
1597
1598 ret = fill_inode(in, NULL, &rde->inode, NULL, session,
1599 req->r_request_started, -1,
1600 &req->r_caps_reservation);
1601 if (ret < 0) {
1602 pr_err("fill_inode badness on %p\n", in);
1603 if (d_really_is_negative(dn))
1604 iput(in);
1605 d_drop(dn);
1606 err = ret;
1607 goto next_item;
1608 }
1609
1610 if (d_really_is_negative(dn)) {
1611 struct dentry *realdn;
1612
1613 if (ceph_security_xattr_deadlock(in)) {
1614 dout(" skip splicing dn %p to inode %p"
1615 " (security xattr deadlock)\n", dn, in);
1616 iput(in);
1617 skipped++;
1618 goto next_item;
1619 }
1620
1621 realdn = splice_dentry(dn, in);
1622 if (IS_ERR(realdn)) {
1623 err = PTR_ERR(realdn);
1624 d_drop(dn);
1625 dn = NULL;
1626 goto next_item;
1627 }
1628 dn = realdn;
1629 }
1630
1631 ceph_dentry(dn)->offset = rde->offset;
1632
1633 dvino = ceph_vino(d_inode(parent));
1634 update_dentry_lease(dn, rde->lease, req->r_session,
1635 req->r_request_started, &tvino, &dvino);
1636
1637 if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
1638 ret = fill_readdir_cache(d_inode(parent), dn,
1639 &cache_ctl, req);
1640 if (ret < 0)
1641 err = ret;
1642 }
1643next_item:
1644 if (dn)
1645 dput(dn);
1646 }
1647out:
1648 if (err == 0 && skipped == 0) {
1649 set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
1650 req->r_readdir_cache_idx = cache_ctl.index;
1651 }
1652 ceph_readdir_cache_release(&cache_ctl);
1653 if (snapdir) {
1654 iput(snapdir);
1655 dput(parent);
1656 }
1657 dout("readdir_prepopulate done\n");
1658 return err;
1659}
1660
1661bool ceph_inode_set_size(struct inode *inode, loff_t size)
1662{
1663 struct ceph_inode_info *ci = ceph_inode(inode);
1664 bool ret;
1665
1666 spin_lock(&ci->i_ceph_lock);
1667 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1668 i_size_write(inode, size);
1669 inode->i_blocks = calc_inode_blocks(size);
1670
1671 ret = __ceph_should_report_size(ci);
1672
1673 spin_unlock(&ci->i_ceph_lock);
1674 return ret;
1675}
1676
1677/*
1678 * Write back inode data in a worker thread. (This can't be done
1679 * in the message handler context.)
1680 */
1681void ceph_queue_writeback(struct inode *inode)
1682{
1683 ihold(inode);
1684 if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1685 &ceph_inode(inode)->i_wb_work)) {
1686 dout("ceph_queue_writeback %p\n", inode);
1687 } else {
1688 dout("ceph_queue_writeback %p failed\n", inode);
1689 iput(inode);
1690 }
1691}
1692
1693static void ceph_writeback_work(struct work_struct *work)
1694{
1695 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1696 i_wb_work);
1697 struct inode *inode = &ci->vfs_inode;
1698
1699 dout("writeback %p\n", inode);
1700 filemap_fdatawrite(&inode->i_data);
1701 iput(inode);
1702}
1703
1704/*
1705 * queue an async invalidation
1706 */
1707void ceph_queue_invalidate(struct inode *inode)
1708{
1709 ihold(inode);
1710 if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1711 &ceph_inode(inode)->i_pg_inv_work)) {
1712 dout("ceph_queue_invalidate %p\n", inode);
1713 } else {
1714 dout("ceph_queue_invalidate %p failed\n", inode);
1715 iput(inode);
1716 }
1717}
1718
1719/*
1720 * Invalidate inode pages in a worker thread. (This can't be done
1721 * in the message handler context.)
1722 */
1723static void ceph_invalidate_work(struct work_struct *work)
1724{
1725 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1726 i_pg_inv_work);
1727 struct inode *inode = &ci->vfs_inode;
1728 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1729 u32 orig_gen;
1730 int check = 0;
1731
1732 mutex_lock(&ci->i_truncate_mutex);
1733
1734 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
1735 pr_warn_ratelimited("invalidate_pages %p %lld forced umount\n",
1736 inode, ceph_ino(inode));
1737 mapping_set_error(inode->i_mapping, -EIO);
1738 truncate_pagecache(inode, 0);
1739 mutex_unlock(&ci->i_truncate_mutex);
1740 goto out;
1741 }
1742
1743 spin_lock(&ci->i_ceph_lock);
1744 dout("invalidate_pages %p gen %d revoking %d\n", inode,
1745 ci->i_rdcache_gen, ci->i_rdcache_revoking);
1746 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1747 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1748 check = 1;
1749 spin_unlock(&ci->i_ceph_lock);
1750 mutex_unlock(&ci->i_truncate_mutex);
1751 goto out;
1752 }
1753 orig_gen = ci->i_rdcache_gen;
1754 spin_unlock(&ci->i_ceph_lock);
1755
1756 if (invalidate_inode_pages2(inode->i_mapping) < 0) {
1757 pr_err("invalidate_pages %p fails\n", inode);
1758 }
1759
1760 spin_lock(&ci->i_ceph_lock);
1761 if (orig_gen == ci->i_rdcache_gen &&
1762 orig_gen == ci->i_rdcache_revoking) {
1763 dout("invalidate_pages %p gen %d successful\n", inode,
1764 ci->i_rdcache_gen);
1765 ci->i_rdcache_revoking--;
1766 check = 1;
1767 } else {
1768 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1769 inode, orig_gen, ci->i_rdcache_gen,
1770 ci->i_rdcache_revoking);
1771 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1772 check = 1;
1773 }
1774 spin_unlock(&ci->i_ceph_lock);
1775 mutex_unlock(&ci->i_truncate_mutex);
1776out:
1777 if (check)
1778 ceph_check_caps(ci, 0, NULL);
1779 iput(inode);
1780}
1781
1782
1783/*
1784 * called by trunc_wq;
1785 *
1786 * We also truncate in a separate thread as well.
1787 */
1788static void ceph_vmtruncate_work(struct work_struct *work)
1789{
1790 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1791 i_vmtruncate_work);
1792 struct inode *inode = &ci->vfs_inode;
1793
1794 dout("vmtruncate_work %p\n", inode);
1795 __ceph_do_pending_vmtruncate(inode);
1796 iput(inode);
1797}
1798
1799/*
1800 * Queue an async vmtruncate. If we fail to queue work, we will handle
1801 * the truncation the next time we call __ceph_do_pending_vmtruncate.
1802 */
1803void ceph_queue_vmtruncate(struct inode *inode)
1804{
1805 struct ceph_inode_info *ci = ceph_inode(inode);
1806
1807 ihold(inode);
1808
1809 if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1810 &ci->i_vmtruncate_work)) {
1811 dout("ceph_queue_vmtruncate %p\n", inode);
1812 } else {
1813 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1814 inode, ci->i_truncate_pending);
1815 iput(inode);
1816 }
1817}
1818
1819/*
1820 * Make sure any pending truncation is applied before doing anything
1821 * that may depend on it.
1822 */
1823void __ceph_do_pending_vmtruncate(struct inode *inode)
1824{
1825 struct ceph_inode_info *ci = ceph_inode(inode);
1826 u64 to;
1827 int wrbuffer_refs, finish = 0;
1828
1829 mutex_lock(&ci->i_truncate_mutex);
1830retry:
1831 spin_lock(&ci->i_ceph_lock);
1832 if (ci->i_truncate_pending == 0) {
1833 dout("__do_pending_vmtruncate %p none pending\n", inode);
1834 spin_unlock(&ci->i_ceph_lock);
1835 mutex_unlock(&ci->i_truncate_mutex);
1836 return;
1837 }
1838
1839 /*
1840 * make sure any dirty snapped pages are flushed before we
1841 * possibly truncate them.. so write AND block!
1842 */
1843 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1844 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1845 inode);
1846 spin_unlock(&ci->i_ceph_lock);
1847 filemap_write_and_wait_range(&inode->i_data, 0,
1848 inode->i_sb->s_maxbytes);
1849 goto retry;
1850 }
1851
1852 /* there should be no reader or writer */
1853 WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1854
1855 to = ci->i_truncate_size;
1856 wrbuffer_refs = ci->i_wrbuffer_ref;
1857 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1858 ci->i_truncate_pending, to);
1859 spin_unlock(&ci->i_ceph_lock);
1860
1861 truncate_pagecache(inode, to);
1862
1863 spin_lock(&ci->i_ceph_lock);
1864 if (to == ci->i_truncate_size) {
1865 ci->i_truncate_pending = 0;
1866 finish = 1;
1867 }
1868 spin_unlock(&ci->i_ceph_lock);
1869 if (!finish)
1870 goto retry;
1871
1872 mutex_unlock(&ci->i_truncate_mutex);
1873
1874 if (wrbuffer_refs == 0)
1875 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1876
1877 wake_up_all(&ci->i_cap_wq);
1878}
1879
1880/*
1881 * symlinks
1882 */
1883static const struct inode_operations ceph_symlink_iops = {
1884 .get_link = simple_get_link,
1885 .setattr = ceph_setattr,
1886 .getattr = ceph_getattr,
1887 .listxattr = ceph_listxattr,
1888};
1889
1890int __ceph_setattr(struct inode *inode, struct iattr *attr)
1891{
1892 struct ceph_inode_info *ci = ceph_inode(inode);
1893 const unsigned int ia_valid = attr->ia_valid;
1894 struct ceph_mds_request *req;
1895 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1896 struct ceph_cap_flush *prealloc_cf;
1897 int issued;
1898 int release = 0, dirtied = 0;
1899 int mask = 0;
1900 int err = 0;
1901 int inode_dirty_flags = 0;
1902 bool lock_snap_rwsem = false;
1903
1904 prealloc_cf = ceph_alloc_cap_flush();
1905 if (!prealloc_cf)
1906 return -ENOMEM;
1907
1908 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1909 USE_AUTH_MDS);
1910 if (IS_ERR(req)) {
1911 ceph_free_cap_flush(prealloc_cf);
1912 return PTR_ERR(req);
1913 }
1914
1915 spin_lock(&ci->i_ceph_lock);
1916 issued = __ceph_caps_issued(ci, NULL);
1917
1918 if (!ci->i_head_snapc &&
1919 (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
1920 lock_snap_rwsem = true;
1921 if (!down_read_trylock(&mdsc->snap_rwsem)) {
1922 spin_unlock(&ci->i_ceph_lock);
1923 down_read(&mdsc->snap_rwsem);
1924 spin_lock(&ci->i_ceph_lock);
1925 issued = __ceph_caps_issued(ci, NULL);
1926 }
1927 }
1928
1929 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1930
1931 if (ia_valid & ATTR_UID) {
1932 dout("setattr %p uid %d -> %d\n", inode,
1933 from_kuid(&init_user_ns, inode->i_uid),
1934 from_kuid(&init_user_ns, attr->ia_uid));
1935 if (issued & CEPH_CAP_AUTH_EXCL) {
1936 inode->i_uid = attr->ia_uid;
1937 dirtied |= CEPH_CAP_AUTH_EXCL;
1938 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1939 !uid_eq(attr->ia_uid, inode->i_uid)) {
1940 req->r_args.setattr.uid = cpu_to_le32(
1941 from_kuid(&init_user_ns, attr->ia_uid));
1942 mask |= CEPH_SETATTR_UID;
1943 release |= CEPH_CAP_AUTH_SHARED;
1944 }
1945 }
1946 if (ia_valid & ATTR_GID) {
1947 dout("setattr %p gid %d -> %d\n", inode,
1948 from_kgid(&init_user_ns, inode->i_gid),
1949 from_kgid(&init_user_ns, attr->ia_gid));
1950 if (issued & CEPH_CAP_AUTH_EXCL) {
1951 inode->i_gid = attr->ia_gid;
1952 dirtied |= CEPH_CAP_AUTH_EXCL;
1953 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1954 !gid_eq(attr->ia_gid, inode->i_gid)) {
1955 req->r_args.setattr.gid = cpu_to_le32(
1956 from_kgid(&init_user_ns, attr->ia_gid));
1957 mask |= CEPH_SETATTR_GID;
1958 release |= CEPH_CAP_AUTH_SHARED;
1959 }
1960 }
1961 if (ia_valid & ATTR_MODE) {
1962 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1963 attr->ia_mode);
1964 if (issued & CEPH_CAP_AUTH_EXCL) {
1965 inode->i_mode = attr->ia_mode;
1966 dirtied |= CEPH_CAP_AUTH_EXCL;
1967 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1968 attr->ia_mode != inode->i_mode) {
1969 inode->i_mode = attr->ia_mode;
1970 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1971 mask |= CEPH_SETATTR_MODE;
1972 release |= CEPH_CAP_AUTH_SHARED;
1973 }
1974 }
1975
1976 if (ia_valid & ATTR_ATIME) {
1977 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1978 inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1979 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1980 if (issued & CEPH_CAP_FILE_EXCL) {
1981 ci->i_time_warp_seq++;
1982 inode->i_atime = attr->ia_atime;
1983 dirtied |= CEPH_CAP_FILE_EXCL;
1984 } else if ((issued & CEPH_CAP_FILE_WR) &&
1985 timespec_compare(&inode->i_atime,
1986 &attr->ia_atime) < 0) {
1987 inode->i_atime = attr->ia_atime;
1988 dirtied |= CEPH_CAP_FILE_WR;
1989 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1990 !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1991 ceph_encode_timespec(&req->r_args.setattr.atime,
1992 &attr->ia_atime);
1993 mask |= CEPH_SETATTR_ATIME;
1994 release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1995 CEPH_CAP_FILE_WR;
1996 }
1997 }
1998 if (ia_valid & ATTR_MTIME) {
1999 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
2000 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
2001 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
2002 if (issued & CEPH_CAP_FILE_EXCL) {
2003 ci->i_time_warp_seq++;
2004 inode->i_mtime = attr->ia_mtime;
2005 dirtied |= CEPH_CAP_FILE_EXCL;
2006 } else if ((issued & CEPH_CAP_FILE_WR) &&
2007 timespec_compare(&inode->i_mtime,
2008 &attr->ia_mtime) < 0) {
2009 inode->i_mtime = attr->ia_mtime;
2010 dirtied |= CEPH_CAP_FILE_WR;
2011 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2012 !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
2013 ceph_encode_timespec(&req->r_args.setattr.mtime,
2014 &attr->ia_mtime);
2015 mask |= CEPH_SETATTR_MTIME;
2016 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
2017 CEPH_CAP_FILE_WR;
2018 }
2019 }
2020 if (ia_valid & ATTR_SIZE) {
2021 dout("setattr %p size %lld -> %lld\n", inode,
2022 inode->i_size, attr->ia_size);
2023 if ((issued & CEPH_CAP_FILE_EXCL) &&
2024 attr->ia_size > inode->i_size) {
2025 i_size_write(inode, attr->ia_size);
2026 inode->i_blocks = calc_inode_blocks(attr->ia_size);
2027 ci->i_reported_size = attr->ia_size;
2028 dirtied |= CEPH_CAP_FILE_EXCL;
2029 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2030 attr->ia_size != inode->i_size) {
2031 req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
2032 req->r_args.setattr.old_size =
2033 cpu_to_le64(inode->i_size);
2034 mask |= CEPH_SETATTR_SIZE;
2035 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
2036 CEPH_CAP_FILE_WR;
2037 }
2038 }
2039
2040 /* these do nothing */
2041 if (ia_valid & ATTR_CTIME) {
2042 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
2043 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
2044 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
2045 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
2046 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
2047 only ? "ctime only" : "ignored");
2048 if (only) {
2049 /*
2050 * if kernel wants to dirty ctime but nothing else,
2051 * we need to choose a cap to dirty under, or do
2052 * a almost-no-op setattr
2053 */
2054 if (issued & CEPH_CAP_AUTH_EXCL)
2055 dirtied |= CEPH_CAP_AUTH_EXCL;
2056 else if (issued & CEPH_CAP_FILE_EXCL)
2057 dirtied |= CEPH_CAP_FILE_EXCL;
2058 else if (issued & CEPH_CAP_XATTR_EXCL)
2059 dirtied |= CEPH_CAP_XATTR_EXCL;
2060 else
2061 mask |= CEPH_SETATTR_CTIME;
2062 }
2063 }
2064 if (ia_valid & ATTR_FILE)
2065 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
2066
2067 if (dirtied) {
2068 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
2069 &prealloc_cf);
2070 inode->i_ctime = attr->ia_ctime;
2071 }
2072
2073 release &= issued;
2074 spin_unlock(&ci->i_ceph_lock);
2075 if (lock_snap_rwsem)
2076 up_read(&mdsc->snap_rwsem);
2077
2078 if (inode_dirty_flags)
2079 __mark_inode_dirty(inode, inode_dirty_flags);
2080
2081
2082 if (mask) {
2083 req->r_inode = inode;
2084 ihold(inode);
2085 req->r_inode_drop = release;
2086 req->r_args.setattr.mask = cpu_to_le32(mask);
2087 req->r_num_caps = 1;
2088 req->r_stamp = attr->ia_ctime;
2089 err = ceph_mdsc_do_request(mdsc, NULL, req);
2090 }
2091 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
2092 ceph_cap_string(dirtied), mask);
2093
2094 ceph_mdsc_put_request(req);
2095 ceph_free_cap_flush(prealloc_cf);
2096
2097 if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
2098 __ceph_do_pending_vmtruncate(inode);
2099
2100 return err;
2101}
2102
2103/*
2104 * setattr
2105 */
2106int ceph_setattr(struct dentry *dentry, struct iattr *attr)
2107{
2108 struct inode *inode = d_inode(dentry);
2109 int err;
2110
2111 if (ceph_snap(inode) != CEPH_NOSNAP)
2112 return -EROFS;
2113
2114 err = setattr_prepare(dentry, attr);
2115 if (err != 0)
2116 return err;
2117
2118 err = __ceph_setattr(inode, attr);
2119
2120 if (err >= 0 && (attr->ia_valid & ATTR_MODE))
2121 err = posix_acl_chmod(inode, attr->ia_mode);
2122
2123 return err;
2124}
2125
2126/*
2127 * Verify that we have a lease on the given mask. If not,
2128 * do a getattr against an mds.
2129 */
2130int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2131 int mask, bool force)
2132{
2133 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2134 struct ceph_mds_client *mdsc = fsc->mdsc;
2135 struct ceph_mds_request *req;
2136 int err;
2137
2138 if (ceph_snap(inode) == CEPH_SNAPDIR) {
2139 dout("do_getattr inode %p SNAPDIR\n", inode);
2140 return 0;
2141 }
2142
2143 dout("do_getattr inode %p mask %s mode 0%o\n",
2144 inode, ceph_cap_string(mask), inode->i_mode);
2145 if (!force && ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
2146 return 0;
2147
2148 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
2149 if (IS_ERR(req))
2150 return PTR_ERR(req);
2151 req->r_inode = inode;
2152 ihold(inode);
2153 req->r_num_caps = 1;
2154 req->r_args.getattr.mask = cpu_to_le32(mask);
2155 req->r_locked_page = locked_page;
2156 err = ceph_mdsc_do_request(mdsc, NULL, req);
2157 if (locked_page && err == 0) {
2158 u64 inline_version = req->r_reply_info.targeti.inline_version;
2159 if (inline_version == 0) {
2160 /* the reply is supposed to contain inline data */
2161 err = -EINVAL;
2162 } else if (inline_version == CEPH_INLINE_NONE) {
2163 err = -ENODATA;
2164 } else {
2165 err = req->r_reply_info.targeti.inline_len;
2166 }
2167 }
2168 ceph_mdsc_put_request(req);
2169 dout("do_getattr result=%d\n", err);
2170 return err;
2171}
2172
2173
2174/*
2175 * Check inode permissions. We verify we have a valid value for
2176 * the AUTH cap, then call the generic handler.
2177 */
2178int ceph_permission(struct inode *inode, int mask)
2179{
2180 int err;
2181
2182 if (mask & MAY_NOT_BLOCK)
2183 return -ECHILD;
2184
2185 err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
2186
2187 if (!err)
2188 err = generic_permission(inode, mask);
2189 return err;
2190}
2191
2192/*
2193 * Get all attributes. Hopefully somedata we'll have a statlite()
2194 * and can limit the fields we require to be accurate.
2195 */
2196int ceph_getattr(const struct path *path, struct kstat *stat,
2197 u32 request_mask, unsigned int flags)
2198{
2199 struct inode *inode = d_inode(path->dentry);
2200 struct ceph_inode_info *ci = ceph_inode(inode);
2201 int err;
2202
2203 err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL, false);
2204 if (!err) {
2205 generic_fillattr(inode, stat);
2206 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
2207 if (ceph_snap(inode) != CEPH_NOSNAP)
2208 stat->dev = ceph_snap(inode);
2209 else
2210 stat->dev = 0;
2211 if (S_ISDIR(inode->i_mode)) {
2212 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
2213 RBYTES))
2214 stat->size = ci->i_rbytes;
2215 else
2216 stat->size = ci->i_files + ci->i_subdirs;
2217 stat->blocks = 0;
2218 stat->blksize = 65536;
2219 }
2220 }
2221 return err;
2222}
Linux 6.x block layer and io_uring tree(s)