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Merge tag 'arc-4.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc
[mirror_ubuntu-bionic-kernel.git] / fs / ceph / inode.c
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
17 #include "super.h"
18 #include "mds_client.h"
19 #include "cache.h"
20 #include <linux/ceph/decode.h>
21
22 /*
23 * Ceph inode operations
24 *
25 * Implement basic inode helpers (get, alloc) and inode ops (getattr,
26 * setattr, etc.), xattr helpers, and helpers for assimilating
27 * metadata returned by the MDS into our cache.
28 *
29 * Also define helpers for doing asynchronous writeback, invalidation,
30 * and truncation for the benefit of those who can't afford to block
31 * (typically because they are in the message handler path).
32 */
33
34 static const struct inode_operations ceph_symlink_iops;
35
36 static void ceph_invalidate_work(struct work_struct *work);
37 static void ceph_writeback_work(struct work_struct *work);
38 static void ceph_vmtruncate_work(struct work_struct *work);
39
40 /*
41 * find or create an inode, given the ceph ino number
42 */
43 static int ceph_set_ino_cb(struct inode *inode, void *data)
44 {
45 ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
46 inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
47 return 0;
48 }
49
50 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
51 {
52 struct inode *inode;
53 ino_t t = ceph_vino_to_ino(vino);
54
55 inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
56 if (!inode)
57 return ERR_PTR(-ENOMEM);
58 if (inode->i_state & I_NEW) {
59 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
60 inode, ceph_vinop(inode), (u64)inode->i_ino);
61 unlock_new_inode(inode);
62 }
63
64 dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
65 vino.snap, inode);
66 return inode;
67 }
68
69 /*
70 * get/constuct snapdir inode for a given directory
71 */
72 struct inode *ceph_get_snapdir(struct inode *parent)
73 {
74 struct ceph_vino vino = {
75 .ino = ceph_ino(parent),
76 .snap = CEPH_SNAPDIR,
77 };
78 struct inode *inode = ceph_get_inode(parent->i_sb, vino);
79 struct ceph_inode_info *ci = ceph_inode(inode);
80
81 BUG_ON(!S_ISDIR(parent->i_mode));
82 if (IS_ERR(inode))
83 return inode;
84 inode->i_mode = parent->i_mode;
85 inode->i_uid = parent->i_uid;
86 inode->i_gid = parent->i_gid;
87 inode->i_op = &ceph_snapdir_iops;
88 inode->i_fop = &ceph_snapdir_fops;
89 ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
90 ci->i_rbytes = 0;
91 return inode;
92 }
93
94 const struct inode_operations ceph_file_iops = {
95 .permission = ceph_permission,
96 .setattr = ceph_setattr,
97 .getattr = ceph_getattr,
98 .listxattr = ceph_listxattr,
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 */
115 static 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 return ERR_PTR(-ENOMEM);
139
140 frag->frag = f;
141 frag->split_by = 0;
142 frag->mds = -1;
143 frag->ndist = 0;
144
145 rb_link_node(&frag->node, parent, p);
146 rb_insert_color(&frag->node, &ci->i_fragtree);
147
148 dout("get_or_create_frag added %llx.%llx frag %x\n",
149 ceph_vinop(&ci->vfs_inode), f);
150 return frag;
151 }
152
153 /*
154 * find a specific frag @f
155 */
156 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
157 {
158 struct rb_node *n = ci->i_fragtree.rb_node;
159
160 while (n) {
161 struct ceph_inode_frag *frag =
162 rb_entry(n, struct ceph_inode_frag, node);
163 int c = ceph_frag_compare(f, frag->frag);
164 if (c < 0)
165 n = n->rb_left;
166 else if (c > 0)
167 n = n->rb_right;
168 else
169 return frag;
170 }
171 return NULL;
172 }
173
174 /*
175 * Choose frag containing the given value @v. If @pfrag is
176 * specified, copy the frag delegation info to the caller if
177 * it is present.
178 */
179 static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
180 struct ceph_inode_frag *pfrag, int *found)
181 {
182 u32 t = ceph_frag_make(0, 0);
183 struct ceph_inode_frag *frag;
184 unsigned nway, i;
185 u32 n;
186
187 if (found)
188 *found = 0;
189
190 while (1) {
191 WARN_ON(!ceph_frag_contains_value(t, v));
192 frag = __ceph_find_frag(ci, t);
193 if (!frag)
194 break; /* t is a leaf */
195 if (frag->split_by == 0) {
196 if (pfrag)
197 memcpy(pfrag, frag, sizeof(*pfrag));
198 if (found)
199 *found = 1;
200 break;
201 }
202
203 /* choose child */
204 nway = 1 << frag->split_by;
205 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
206 frag->split_by, nway);
207 for (i = 0; i < nway; i++) {
208 n = ceph_frag_make_child(t, frag->split_by, i);
209 if (ceph_frag_contains_value(n, v)) {
210 t = n;
211 break;
212 }
213 }
214 BUG_ON(i == nway);
215 }
216 dout("choose_frag(%x) = %x\n", v, t);
217
218 return t;
219 }
220
221 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
222 struct ceph_inode_frag *pfrag, int *found)
223 {
224 u32 ret;
225 mutex_lock(&ci->i_fragtree_mutex);
226 ret = __ceph_choose_frag(ci, v, pfrag, found);
227 mutex_unlock(&ci->i_fragtree_mutex);
228 return ret;
229 }
230
231 /*
232 * Process dirfrag (delegation) info from the mds. Include leaf
233 * fragment in tree ONLY if ndist > 0. Otherwise, only
234 * branches/splits are included in i_fragtree)
235 */
236 static int ceph_fill_dirfrag(struct inode *inode,
237 struct ceph_mds_reply_dirfrag *dirinfo)
238 {
239 struct ceph_inode_info *ci = ceph_inode(inode);
240 struct ceph_inode_frag *frag;
241 u32 id = le32_to_cpu(dirinfo->frag);
242 int mds = le32_to_cpu(dirinfo->auth);
243 int ndist = le32_to_cpu(dirinfo->ndist);
244 int diri_auth = -1;
245 int i;
246 int err = 0;
247
248 spin_lock(&ci->i_ceph_lock);
249 if (ci->i_auth_cap)
250 diri_auth = ci->i_auth_cap->mds;
251 spin_unlock(&ci->i_ceph_lock);
252
253 if (mds == -1) /* CDIR_AUTH_PARENT */
254 mds = diri_auth;
255
256 mutex_lock(&ci->i_fragtree_mutex);
257 if (ndist == 0 && mds == diri_auth) {
258 /* no delegation info needed. */
259 frag = __ceph_find_frag(ci, id);
260 if (!frag)
261 goto out;
262 if (frag->split_by == 0) {
263 /* tree leaf, remove */
264 dout("fill_dirfrag removed %llx.%llx frag %x"
265 " (no ref)\n", ceph_vinop(inode), id);
266 rb_erase(&frag->node, &ci->i_fragtree);
267 kfree(frag);
268 } else {
269 /* tree branch, keep and clear */
270 dout("fill_dirfrag cleared %llx.%llx frag %x"
271 " referral\n", ceph_vinop(inode), id);
272 frag->mds = -1;
273 frag->ndist = 0;
274 }
275 goto out;
276 }
277
278
279 /* find/add this frag to store mds delegation info */
280 frag = __get_or_create_frag(ci, id);
281 if (IS_ERR(frag)) {
282 /* this is not the end of the world; we can continue
283 with bad/inaccurate delegation info */
284 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
285 ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
286 err = -ENOMEM;
287 goto out;
288 }
289
290 frag->mds = mds;
291 frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
292 for (i = 0; i < frag->ndist; i++)
293 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
294 dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
295 ceph_vinop(inode), frag->frag, frag->ndist);
296
297 out:
298 mutex_unlock(&ci->i_fragtree_mutex);
299 return err;
300 }
301
302 static int frag_tree_split_cmp(const void *l, const void *r)
303 {
304 struct ceph_frag_tree_split *ls = (struct ceph_frag_tree_split*)l;
305 struct ceph_frag_tree_split *rs = (struct ceph_frag_tree_split*)r;
306 return ceph_frag_compare(le32_to_cpu(ls->frag),
307 le32_to_cpu(rs->frag));
308 }
309
310 static bool is_frag_child(u32 f, struct ceph_inode_frag *frag)
311 {
312 if (!frag)
313 return f == ceph_frag_make(0, 0);
314 if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by)
315 return false;
316 return ceph_frag_contains_value(frag->frag, ceph_frag_value(f));
317 }
318
319 static int ceph_fill_fragtree(struct inode *inode,
320 struct ceph_frag_tree_head *fragtree,
321 struct ceph_mds_reply_dirfrag *dirinfo)
322 {
323 struct ceph_inode_info *ci = ceph_inode(inode);
324 struct ceph_inode_frag *frag, *prev_frag = NULL;
325 struct rb_node *rb_node;
326 unsigned i, split_by, nsplits;
327 u32 id;
328 bool update = false;
329
330 mutex_lock(&ci->i_fragtree_mutex);
331 nsplits = le32_to_cpu(fragtree->nsplits);
332 if (nsplits != ci->i_fragtree_nsplits) {
333 update = true;
334 } else if (nsplits) {
335 i = prandom_u32() % nsplits;
336 id = le32_to_cpu(fragtree->splits[i].frag);
337 if (!__ceph_find_frag(ci, id))
338 update = true;
339 } else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) {
340 rb_node = rb_first(&ci->i_fragtree);
341 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
342 if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node))
343 update = true;
344 }
345 if (!update && dirinfo) {
346 id = le32_to_cpu(dirinfo->frag);
347 if (id != __ceph_choose_frag(ci, id, NULL, NULL))
348 update = true;
349 }
350 if (!update)
351 goto out_unlock;
352
353 if (nsplits > 1) {
354 sort(fragtree->splits, nsplits, sizeof(fragtree->splits[0]),
355 frag_tree_split_cmp, NULL);
356 }
357
358 dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode));
359 rb_node = rb_first(&ci->i_fragtree);
360 for (i = 0; i < nsplits; i++) {
361 id = le32_to_cpu(fragtree->splits[i].frag);
362 split_by = le32_to_cpu(fragtree->splits[i].by);
363 if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) {
364 pr_err("fill_fragtree %llx.%llx invalid split %d/%u, "
365 "frag %x split by %d\n", ceph_vinop(inode),
366 i, nsplits, id, split_by);
367 continue;
368 }
369 frag = NULL;
370 while (rb_node) {
371 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
372 if (ceph_frag_compare(frag->frag, id) >= 0) {
373 if (frag->frag != id)
374 frag = NULL;
375 else
376 rb_node = rb_next(rb_node);
377 break;
378 }
379 rb_node = rb_next(rb_node);
380 /* delete stale split/leaf node */
381 if (frag->split_by > 0 ||
382 !is_frag_child(frag->frag, prev_frag)) {
383 rb_erase(&frag->node, &ci->i_fragtree);
384 if (frag->split_by > 0)
385 ci->i_fragtree_nsplits--;
386 kfree(frag);
387 }
388 frag = NULL;
389 }
390 if (!frag) {
391 frag = __get_or_create_frag(ci, id);
392 if (IS_ERR(frag))
393 continue;
394 }
395 if (frag->split_by == 0)
396 ci->i_fragtree_nsplits++;
397 frag->split_by = split_by;
398 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
399 prev_frag = frag;
400 }
401 while (rb_node) {
402 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
403 rb_node = rb_next(rb_node);
404 /* delete stale split/leaf node */
405 if (frag->split_by > 0 ||
406 !is_frag_child(frag->frag, prev_frag)) {
407 rb_erase(&frag->node, &ci->i_fragtree);
408 if (frag->split_by > 0)
409 ci->i_fragtree_nsplits--;
410 kfree(frag);
411 }
412 }
413 out_unlock:
414 mutex_unlock(&ci->i_fragtree_mutex);
415 return 0;
416 }
417
418 /*
419 * initialize a newly allocated inode.
420 */
421 struct inode *ceph_alloc_inode(struct super_block *sb)
422 {
423 struct ceph_inode_info *ci;
424 int i;
425
426 ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
427 if (!ci)
428 return NULL;
429
430 dout("alloc_inode %p\n", &ci->vfs_inode);
431
432 spin_lock_init(&ci->i_ceph_lock);
433
434 ci->i_version = 0;
435 ci->i_inline_version = 0;
436 ci->i_time_warp_seq = 0;
437 ci->i_ceph_flags = 0;
438 atomic64_set(&ci->i_ordered_count, 1);
439 atomic64_set(&ci->i_release_count, 1);
440 atomic64_set(&ci->i_complete_seq[0], 0);
441 atomic64_set(&ci->i_complete_seq[1], 0);
442 ci->i_symlink = NULL;
443
444 memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
445 RCU_INIT_POINTER(ci->i_layout.pool_ns, NULL);
446
447 ci->i_fragtree = RB_ROOT;
448 mutex_init(&ci->i_fragtree_mutex);
449
450 ci->i_xattrs.blob = NULL;
451 ci->i_xattrs.prealloc_blob = NULL;
452 ci->i_xattrs.dirty = false;
453 ci->i_xattrs.index = RB_ROOT;
454 ci->i_xattrs.count = 0;
455 ci->i_xattrs.names_size = 0;
456 ci->i_xattrs.vals_size = 0;
457 ci->i_xattrs.version = 0;
458 ci->i_xattrs.index_version = 0;
459
460 ci->i_caps = RB_ROOT;
461 ci->i_auth_cap = NULL;
462 ci->i_dirty_caps = 0;
463 ci->i_flushing_caps = 0;
464 INIT_LIST_HEAD(&ci->i_dirty_item);
465 INIT_LIST_HEAD(&ci->i_flushing_item);
466 ci->i_prealloc_cap_flush = NULL;
467 INIT_LIST_HEAD(&ci->i_cap_flush_list);
468 init_waitqueue_head(&ci->i_cap_wq);
469 ci->i_hold_caps_min = 0;
470 ci->i_hold_caps_max = 0;
471 INIT_LIST_HEAD(&ci->i_cap_delay_list);
472 INIT_LIST_HEAD(&ci->i_cap_snaps);
473 ci->i_head_snapc = NULL;
474 ci->i_snap_caps = 0;
475
476 for (i = 0; i < CEPH_FILE_MODE_BITS; i++)
477 ci->i_nr_by_mode[i] = 0;
478
479 mutex_init(&ci->i_truncate_mutex);
480 ci->i_truncate_seq = 0;
481 ci->i_truncate_size = 0;
482 ci->i_truncate_pending = 0;
483
484 ci->i_max_size = 0;
485 ci->i_reported_size = 0;
486 ci->i_wanted_max_size = 0;
487 ci->i_requested_max_size = 0;
488
489 ci->i_pin_ref = 0;
490 ci->i_rd_ref = 0;
491 ci->i_rdcache_ref = 0;
492 ci->i_wr_ref = 0;
493 ci->i_wb_ref = 0;
494 ci->i_wrbuffer_ref = 0;
495 ci->i_wrbuffer_ref_head = 0;
496 atomic_set(&ci->i_filelock_ref, 0);
497 ci->i_shared_gen = 0;
498 ci->i_rdcache_gen = 0;
499 ci->i_rdcache_revoking = 0;
500
501 INIT_LIST_HEAD(&ci->i_unsafe_dirops);
502 INIT_LIST_HEAD(&ci->i_unsafe_iops);
503 spin_lock_init(&ci->i_unsafe_lock);
504
505 ci->i_snap_realm = NULL;
506 INIT_LIST_HEAD(&ci->i_snap_realm_item);
507 INIT_LIST_HEAD(&ci->i_snap_flush_item);
508
509 INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
510 INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
511
512 INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
513
514 ceph_fscache_inode_init(ci);
515
516 return &ci->vfs_inode;
517 }
518
519 static void ceph_i_callback(struct rcu_head *head)
520 {
521 struct inode *inode = container_of(head, struct inode, i_rcu);
522 struct ceph_inode_info *ci = ceph_inode(inode);
523
524 kmem_cache_free(ceph_inode_cachep, ci);
525 }
526
527 void ceph_destroy_inode(struct inode *inode)
528 {
529 struct ceph_inode_info *ci = ceph_inode(inode);
530 struct ceph_inode_frag *frag;
531 struct rb_node *n;
532
533 dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
534
535 ceph_fscache_unregister_inode_cookie(ci);
536
537 ceph_queue_caps_release(inode);
538
539 /*
540 * we may still have a snap_realm reference if there are stray
541 * caps in i_snap_caps.
542 */
543 if (ci->i_snap_realm) {
544 struct ceph_mds_client *mdsc =
545 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
546 struct ceph_snap_realm *realm = ci->i_snap_realm;
547
548 dout(" dropping residual ref to snap realm %p\n", realm);
549 spin_lock(&realm->inodes_with_caps_lock);
550 list_del_init(&ci->i_snap_realm_item);
551 spin_unlock(&realm->inodes_with_caps_lock);
552 ceph_put_snap_realm(mdsc, realm);
553 }
554
555 kfree(ci->i_symlink);
556 while ((n = rb_first(&ci->i_fragtree)) != NULL) {
557 frag = rb_entry(n, struct ceph_inode_frag, node);
558 rb_erase(n, &ci->i_fragtree);
559 kfree(frag);
560 }
561 ci->i_fragtree_nsplits = 0;
562
563 __ceph_destroy_xattrs(ci);
564 if (ci->i_xattrs.blob)
565 ceph_buffer_put(ci->i_xattrs.blob);
566 if (ci->i_xattrs.prealloc_blob)
567 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
568
569 ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns));
570
571 call_rcu(&inode->i_rcu, ceph_i_callback);
572 }
573
574 int ceph_drop_inode(struct inode *inode)
575 {
576 /*
577 * Positve dentry and corresponding inode are always accompanied
578 * in MDS reply. So no need to keep inode in the cache after
579 * dropping all its aliases.
580 */
581 return 1;
582 }
583
584 static inline blkcnt_t calc_inode_blocks(u64 size)
585 {
586 return (size + (1<<9) - 1) >> 9;
587 }
588
589 /*
590 * Helpers to fill in size, ctime, mtime, and atime. We have to be
591 * careful because either the client or MDS may have more up to date
592 * info, depending on which capabilities are held, and whether
593 * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime
594 * and size are monotonically increasing, except when utimes() or
595 * truncate() increments the corresponding _seq values.)
596 */
597 int ceph_fill_file_size(struct inode *inode, int issued,
598 u32 truncate_seq, u64 truncate_size, u64 size)
599 {
600 struct ceph_inode_info *ci = ceph_inode(inode);
601 int queue_trunc = 0;
602
603 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
604 (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
605 dout("size %lld -> %llu\n", inode->i_size, size);
606 if (size > 0 && S_ISDIR(inode->i_mode)) {
607 pr_err("fill_file_size non-zero size for directory\n");
608 size = 0;
609 }
610 i_size_write(inode, size);
611 inode->i_blocks = calc_inode_blocks(size);
612 ci->i_reported_size = size;
613 if (truncate_seq != ci->i_truncate_seq) {
614 dout("truncate_seq %u -> %u\n",
615 ci->i_truncate_seq, truncate_seq);
616 ci->i_truncate_seq = truncate_seq;
617
618 /* the MDS should have revoked these caps */
619 WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
620 CEPH_CAP_FILE_RD |
621 CEPH_CAP_FILE_WR |
622 CEPH_CAP_FILE_LAZYIO));
623 /*
624 * If we hold relevant caps, or in the case where we're
625 * not the only client referencing this file and we
626 * don't hold those caps, then we need to check whether
627 * the file is either opened or mmaped
628 */
629 if ((issued & (CEPH_CAP_FILE_CACHE|
630 CEPH_CAP_FILE_BUFFER)) ||
631 mapping_mapped(inode->i_mapping) ||
632 __ceph_caps_file_wanted(ci)) {
633 ci->i_truncate_pending++;
634 queue_trunc = 1;
635 }
636 }
637 }
638 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
639 ci->i_truncate_size != truncate_size) {
640 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
641 truncate_size);
642 ci->i_truncate_size = truncate_size;
643 }
644
645 if (queue_trunc)
646 ceph_fscache_invalidate(inode);
647
648 return queue_trunc;
649 }
650
651 void ceph_fill_file_time(struct inode *inode, int issued,
652 u64 time_warp_seq, struct timespec *ctime,
653 struct timespec *mtime, struct timespec *atime)
654 {
655 struct ceph_inode_info *ci = ceph_inode(inode);
656 int warn = 0;
657
658 if (issued & (CEPH_CAP_FILE_EXCL|
659 CEPH_CAP_FILE_WR|
660 CEPH_CAP_FILE_BUFFER|
661 CEPH_CAP_AUTH_EXCL|
662 CEPH_CAP_XATTR_EXCL)) {
663 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
664 dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
665 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
666 ctime->tv_sec, ctime->tv_nsec);
667 inode->i_ctime = *ctime;
668 }
669 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
670 /* the MDS did a utimes() */
671 dout("mtime %ld.%09ld -> %ld.%09ld "
672 "tw %d -> %d\n",
673 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
674 mtime->tv_sec, mtime->tv_nsec,
675 ci->i_time_warp_seq, (int)time_warp_seq);
676
677 inode->i_mtime = *mtime;
678 inode->i_atime = *atime;
679 ci->i_time_warp_seq = time_warp_seq;
680 } else if (time_warp_seq == ci->i_time_warp_seq) {
681 /* nobody did utimes(); take the max */
682 if (timespec_compare(mtime, &inode->i_mtime) > 0) {
683 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
684 inode->i_mtime.tv_sec,
685 inode->i_mtime.tv_nsec,
686 mtime->tv_sec, mtime->tv_nsec);
687 inode->i_mtime = *mtime;
688 }
689 if (timespec_compare(atime, &inode->i_atime) > 0) {
690 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
691 inode->i_atime.tv_sec,
692 inode->i_atime.tv_nsec,
693 atime->tv_sec, atime->tv_nsec);
694 inode->i_atime = *atime;
695 }
696 } else if (issued & CEPH_CAP_FILE_EXCL) {
697 /* we did a utimes(); ignore mds values */
698 } else {
699 warn = 1;
700 }
701 } else {
702 /* we have no write|excl caps; whatever the MDS says is true */
703 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
704 inode->i_ctime = *ctime;
705 inode->i_mtime = *mtime;
706 inode->i_atime = *atime;
707 ci->i_time_warp_seq = time_warp_seq;
708 } else {
709 warn = 1;
710 }
711 }
712 if (warn) /* time_warp_seq shouldn't go backwards */
713 dout("%p mds time_warp_seq %llu < %u\n",
714 inode, time_warp_seq, ci->i_time_warp_seq);
715 }
716
717 /*
718 * Populate an inode based on info from mds. May be called on new or
719 * existing inodes.
720 */
721 static int fill_inode(struct inode *inode, struct page *locked_page,
722 struct ceph_mds_reply_info_in *iinfo,
723 struct ceph_mds_reply_dirfrag *dirinfo,
724 struct ceph_mds_session *session,
725 unsigned long ttl_from, int cap_fmode,
726 struct ceph_cap_reservation *caps_reservation)
727 {
728 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
729 struct ceph_mds_reply_inode *info = iinfo->in;
730 struct ceph_inode_info *ci = ceph_inode(inode);
731 int issued = 0, implemented, new_issued;
732 struct timespec mtime, atime, ctime;
733 struct ceph_buffer *xattr_blob = NULL;
734 struct ceph_string *pool_ns = NULL;
735 struct ceph_cap *new_cap = NULL;
736 int err = 0;
737 bool wake = false;
738 bool queue_trunc = false;
739 bool new_version = false;
740 bool fill_inline = false;
741
742 dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
743 inode, ceph_vinop(inode), le64_to_cpu(info->version),
744 ci->i_version);
745
746 /* prealloc new cap struct */
747 if (info->cap.caps && ceph_snap(inode) == CEPH_NOSNAP)
748 new_cap = ceph_get_cap(mdsc, caps_reservation);
749
750 /*
751 * prealloc xattr data, if it looks like we'll need it. only
752 * if len > 4 (meaning there are actually xattrs; the first 4
753 * bytes are the xattr count).
754 */
755 if (iinfo->xattr_len > 4) {
756 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
757 if (!xattr_blob)
758 pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
759 iinfo->xattr_len);
760 }
761
762 if (iinfo->pool_ns_len > 0)
763 pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data,
764 iinfo->pool_ns_len);
765
766 spin_lock(&ci->i_ceph_lock);
767
768 /*
769 * provided version will be odd if inode value is projected,
770 * even if stable. skip the update if we have newer stable
771 * info (ours>=theirs, e.g. due to racing mds replies), unless
772 * we are getting projected (unstable) info (in which case the
773 * version is odd, and we want ours>theirs).
774 * us them
775 * 2 2 skip
776 * 3 2 skip
777 * 3 3 update
778 */
779 if (ci->i_version == 0 ||
780 ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
781 le64_to_cpu(info->version) > (ci->i_version & ~1)))
782 new_version = true;
783
784 issued = __ceph_caps_issued(ci, &implemented);
785 issued |= implemented | __ceph_caps_dirty(ci);
786 new_issued = ~issued & le32_to_cpu(info->cap.caps);
787
788 /* update inode */
789 ci->i_version = le64_to_cpu(info->version);
790 inode->i_rdev = le32_to_cpu(info->rdev);
791 inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
792
793 if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
794 (issued & CEPH_CAP_AUTH_EXCL) == 0) {
795 inode->i_mode = le32_to_cpu(info->mode);
796 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
797 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
798 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
799 from_kuid(&init_user_ns, inode->i_uid),
800 from_kgid(&init_user_ns, inode->i_gid));
801 }
802
803 if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
804 (issued & CEPH_CAP_LINK_EXCL) == 0)
805 set_nlink(inode, le32_to_cpu(info->nlink));
806
807 if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
808 /* be careful with mtime, atime, size */
809 ceph_decode_timespec(&atime, &info->atime);
810 ceph_decode_timespec(&mtime, &info->mtime);
811 ceph_decode_timespec(&ctime, &info->ctime);
812 ceph_fill_file_time(inode, issued,
813 le32_to_cpu(info->time_warp_seq),
814 &ctime, &mtime, &atime);
815 }
816
817 if (new_version ||
818 (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
819 s64 old_pool = ci->i_layout.pool_id;
820 struct ceph_string *old_ns;
821
822 ceph_file_layout_from_legacy(&ci->i_layout, &info->layout);
823 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
824 lockdep_is_held(&ci->i_ceph_lock));
825 rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns);
826
827 if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns)
828 ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
829
830 pool_ns = old_ns;
831
832 queue_trunc = ceph_fill_file_size(inode, issued,
833 le32_to_cpu(info->truncate_seq),
834 le64_to_cpu(info->truncate_size),
835 le64_to_cpu(info->size));
836 /* only update max_size on auth cap */
837 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
838 ci->i_max_size != le64_to_cpu(info->max_size)) {
839 dout("max_size %lld -> %llu\n", ci->i_max_size,
840 le64_to_cpu(info->max_size));
841 ci->i_max_size = le64_to_cpu(info->max_size);
842 }
843 }
844
845 /* xattrs */
846 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
847 if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL)) &&
848 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
849 if (ci->i_xattrs.blob)
850 ceph_buffer_put(ci->i_xattrs.blob);
851 ci->i_xattrs.blob = xattr_blob;
852 if (xattr_blob)
853 memcpy(ci->i_xattrs.blob->vec.iov_base,
854 iinfo->xattr_data, iinfo->xattr_len);
855 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
856 ceph_forget_all_cached_acls(inode);
857 xattr_blob = NULL;
858 }
859
860 inode->i_mapping->a_ops = &ceph_aops;
861
862 switch (inode->i_mode & S_IFMT) {
863 case S_IFIFO:
864 case S_IFBLK:
865 case S_IFCHR:
866 case S_IFSOCK:
867 init_special_inode(inode, inode->i_mode, inode->i_rdev);
868 inode->i_op = &ceph_file_iops;
869 break;
870 case S_IFREG:
871 inode->i_op = &ceph_file_iops;
872 inode->i_fop = &ceph_file_fops;
873 break;
874 case S_IFLNK:
875 inode->i_op = &ceph_symlink_iops;
876 if (!ci->i_symlink) {
877 u32 symlen = iinfo->symlink_len;
878 char *sym;
879
880 spin_unlock(&ci->i_ceph_lock);
881
882 if (symlen != i_size_read(inode)) {
883 pr_err("fill_inode %llx.%llx BAD symlink "
884 "size %lld\n", ceph_vinop(inode),
885 i_size_read(inode));
886 i_size_write(inode, symlen);
887 inode->i_blocks = calc_inode_blocks(symlen);
888 }
889
890 err = -ENOMEM;
891 sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
892 if (!sym)
893 goto out;
894
895 spin_lock(&ci->i_ceph_lock);
896 if (!ci->i_symlink)
897 ci->i_symlink = sym;
898 else
899 kfree(sym); /* lost a race */
900 }
901 inode->i_link = ci->i_symlink;
902 break;
903 case S_IFDIR:
904 inode->i_op = &ceph_dir_iops;
905 inode->i_fop = &ceph_dir_fops;
906
907 ci->i_dir_layout = iinfo->dir_layout;
908
909 ci->i_files = le64_to_cpu(info->files);
910 ci->i_subdirs = le64_to_cpu(info->subdirs);
911 ci->i_rbytes = le64_to_cpu(info->rbytes);
912 ci->i_rfiles = le64_to_cpu(info->rfiles);
913 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
914 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
915 break;
916 default:
917 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
918 ceph_vinop(inode), inode->i_mode);
919 }
920
921 /* were we issued a capability? */
922 if (info->cap.caps) {
923 if (ceph_snap(inode) == CEPH_NOSNAP) {
924 unsigned caps = le32_to_cpu(info->cap.caps);
925 ceph_add_cap(inode, session,
926 le64_to_cpu(info->cap.cap_id),
927 cap_fmode, caps,
928 le32_to_cpu(info->cap.wanted),
929 le32_to_cpu(info->cap.seq),
930 le32_to_cpu(info->cap.mseq),
931 le64_to_cpu(info->cap.realm),
932 info->cap.flags, &new_cap);
933
934 /* set dir completion flag? */
935 if (S_ISDIR(inode->i_mode) &&
936 ci->i_files == 0 && ci->i_subdirs == 0 &&
937 (caps & CEPH_CAP_FILE_SHARED) &&
938 (issued & CEPH_CAP_FILE_EXCL) == 0 &&
939 !__ceph_dir_is_complete(ci)) {
940 dout(" marking %p complete (empty)\n", inode);
941 i_size_write(inode, 0);
942 __ceph_dir_set_complete(ci,
943 atomic64_read(&ci->i_release_count),
944 atomic64_read(&ci->i_ordered_count));
945 }
946
947 wake = true;
948 } else {
949 dout(" %p got snap_caps %s\n", inode,
950 ceph_cap_string(le32_to_cpu(info->cap.caps)));
951 ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
952 if (cap_fmode >= 0)
953 __ceph_get_fmode(ci, cap_fmode);
954 }
955 } else if (cap_fmode >= 0) {
956 pr_warn("mds issued no caps on %llx.%llx\n",
957 ceph_vinop(inode));
958 __ceph_get_fmode(ci, cap_fmode);
959 }
960
961 if (iinfo->inline_version > 0 &&
962 iinfo->inline_version >= ci->i_inline_version) {
963 int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
964 ci->i_inline_version = iinfo->inline_version;
965 if (ci->i_inline_version != CEPH_INLINE_NONE &&
966 (locked_page ||
967 (le32_to_cpu(info->cap.caps) & cache_caps)))
968 fill_inline = true;
969 }
970
971 spin_unlock(&ci->i_ceph_lock);
972
973 if (fill_inline)
974 ceph_fill_inline_data(inode, locked_page,
975 iinfo->inline_data, iinfo->inline_len);
976
977 if (wake)
978 wake_up_all(&ci->i_cap_wq);
979
980 /* queue truncate if we saw i_size decrease */
981 if (queue_trunc)
982 ceph_queue_vmtruncate(inode);
983
984 /* populate frag tree */
985 if (S_ISDIR(inode->i_mode))
986 ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
987
988 /* update delegation info? */
989 if (dirinfo)
990 ceph_fill_dirfrag(inode, dirinfo);
991
992 err = 0;
993 out:
994 if (new_cap)
995 ceph_put_cap(mdsc, new_cap);
996 if (xattr_blob)
997 ceph_buffer_put(xattr_blob);
998 ceph_put_string(pool_ns);
999 return err;
1000 }
1001
1002 /*
1003 * caller should hold session s_mutex.
1004 */
1005 static void update_dentry_lease(struct dentry *dentry,
1006 struct ceph_mds_reply_lease *lease,
1007 struct ceph_mds_session *session,
1008 unsigned long from_time,
1009 struct ceph_vino *tgt_vino,
1010 struct ceph_vino *dir_vino)
1011 {
1012 struct ceph_dentry_info *di = ceph_dentry(dentry);
1013 long unsigned duration = le32_to_cpu(lease->duration_ms);
1014 long unsigned ttl = from_time + (duration * HZ) / 1000;
1015 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
1016 struct inode *dir;
1017 struct ceph_mds_session *old_lease_session = NULL;
1018
1019 /*
1020 * Make sure dentry's inode matches tgt_vino. NULL tgt_vino means that
1021 * we expect a negative dentry.
1022 */
1023 if (!tgt_vino && d_really_is_positive(dentry))
1024 return;
1025
1026 if (tgt_vino && (d_really_is_negative(dentry) ||
1027 !ceph_ino_compare(d_inode(dentry), tgt_vino)))
1028 return;
1029
1030 spin_lock(&dentry->d_lock);
1031 dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
1032 dentry, duration, ttl);
1033
1034 dir = d_inode(dentry->d_parent);
1035
1036 /* make sure parent matches dir_vino */
1037 if (!ceph_ino_compare(dir, dir_vino))
1038 goto out_unlock;
1039
1040 /* only track leases on regular dentries */
1041 if (ceph_snap(dir) != CEPH_NOSNAP)
1042 goto out_unlock;
1043
1044 di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
1045
1046 if (duration == 0)
1047 goto out_unlock;
1048
1049 if (di->lease_gen == session->s_cap_gen &&
1050 time_before(ttl, di->time))
1051 goto out_unlock; /* we already have a newer lease. */
1052
1053 if (di->lease_session && di->lease_session != session) {
1054 old_lease_session = di->lease_session;
1055 di->lease_session = NULL;
1056 }
1057
1058 ceph_dentry_lru_touch(dentry);
1059
1060 if (!di->lease_session)
1061 di->lease_session = ceph_get_mds_session(session);
1062 di->lease_gen = session->s_cap_gen;
1063 di->lease_seq = le32_to_cpu(lease->seq);
1064 di->lease_renew_after = half_ttl;
1065 di->lease_renew_from = 0;
1066 di->time = ttl;
1067 out_unlock:
1068 spin_unlock(&dentry->d_lock);
1069 if (old_lease_session)
1070 ceph_put_mds_session(old_lease_session);
1071 }
1072
1073 /*
1074 * splice a dentry to an inode.
1075 * caller must hold directory i_mutex for this to be safe.
1076 */
1077 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in)
1078 {
1079 struct dentry *realdn;
1080
1081 BUG_ON(d_inode(dn));
1082
1083 /* dn must be unhashed */
1084 if (!d_unhashed(dn))
1085 d_drop(dn);
1086 realdn = d_splice_alias(in, dn);
1087 if (IS_ERR(realdn)) {
1088 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
1089 PTR_ERR(realdn), dn, in, ceph_vinop(in));
1090 dn = realdn; /* note realdn contains the error */
1091 goto out;
1092 } else if (realdn) {
1093 dout("dn %p (%d) spliced with %p (%d) "
1094 "inode %p ino %llx.%llx\n",
1095 dn, d_count(dn),
1096 realdn, d_count(realdn),
1097 d_inode(realdn), ceph_vinop(d_inode(realdn)));
1098 dput(dn);
1099 dn = realdn;
1100 } else {
1101 BUG_ON(!ceph_dentry(dn));
1102 dout("dn %p attached to %p ino %llx.%llx\n",
1103 dn, d_inode(dn), ceph_vinop(d_inode(dn)));
1104 }
1105 out:
1106 return dn;
1107 }
1108
1109 /*
1110 * Incorporate results into the local cache. This is either just
1111 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1112 * after a lookup).
1113 *
1114 * A reply may contain
1115 * a directory inode along with a dentry.
1116 * and/or a target inode
1117 *
1118 * Called with snap_rwsem (read).
1119 */
1120 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
1121 {
1122 struct ceph_mds_session *session = req->r_session;
1123 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1124 struct inode *in = NULL;
1125 struct ceph_vino tvino, dvino;
1126 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1127 int err = 0;
1128
1129 dout("fill_trace %p is_dentry %d is_target %d\n", req,
1130 rinfo->head->is_dentry, rinfo->head->is_target);
1131
1132 if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1133 dout("fill_trace reply is empty!\n");
1134 if (rinfo->head->result == 0 && req->r_parent)
1135 ceph_invalidate_dir_request(req);
1136 return 0;
1137 }
1138
1139 if (rinfo->head->is_dentry) {
1140 struct inode *dir = req->r_parent;
1141
1142 if (dir) {
1143 err = fill_inode(dir, NULL,
1144 &rinfo->diri, rinfo->dirfrag,
1145 session, req->r_request_started, -1,
1146 &req->r_caps_reservation);
1147 if (err < 0)
1148 goto done;
1149 } else {
1150 WARN_ON_ONCE(1);
1151 }
1152
1153 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME) {
1154 struct qstr dname;
1155 struct dentry *dn, *parent;
1156
1157 BUG_ON(!rinfo->head->is_target);
1158 BUG_ON(req->r_dentry);
1159
1160 parent = d_find_any_alias(dir);
1161 BUG_ON(!parent);
1162
1163 dname.name = rinfo->dname;
1164 dname.len = rinfo->dname_len;
1165 dname.hash = full_name_hash(parent, dname.name, dname.len);
1166 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1167 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1168 retry_lookup:
1169 dn = d_lookup(parent, &dname);
1170 dout("d_lookup on parent=%p name=%.*s got %p\n",
1171 parent, dname.len, dname.name, dn);
1172
1173 if (!dn) {
1174 dn = d_alloc(parent, &dname);
1175 dout("d_alloc %p '%.*s' = %p\n", parent,
1176 dname.len, dname.name, dn);
1177 if (!dn) {
1178 dput(parent);
1179 err = -ENOMEM;
1180 goto done;
1181 }
1182 err = 0;
1183 } else if (d_really_is_positive(dn) &&
1184 (ceph_ino(d_inode(dn)) != tvino.ino ||
1185 ceph_snap(d_inode(dn)) != tvino.snap)) {
1186 dout(" dn %p points to wrong inode %p\n",
1187 dn, d_inode(dn));
1188 ceph_dir_clear_ordered(dir);
1189 d_delete(dn);
1190 dput(dn);
1191 goto retry_lookup;
1192 }
1193
1194 req->r_dentry = dn;
1195 dput(parent);
1196 }
1197 }
1198
1199 if (rinfo->head->is_target) {
1200 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1201 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1202
1203 in = ceph_get_inode(sb, tvino);
1204 if (IS_ERR(in)) {
1205 err = PTR_ERR(in);
1206 goto done;
1207 }
1208 req->r_target_inode = in;
1209
1210 err = fill_inode(in, req->r_locked_page, &rinfo->targeti, NULL,
1211 session, req->r_request_started,
1212 (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1213 rinfo->head->result == 0) ? req->r_fmode : -1,
1214 &req->r_caps_reservation);
1215 if (err < 0) {
1216 pr_err("fill_inode badness %p %llx.%llx\n",
1217 in, ceph_vinop(in));
1218 goto done;
1219 }
1220 }
1221
1222 /*
1223 * ignore null lease/binding on snapdir ENOENT, or else we
1224 * will have trouble splicing in the virtual snapdir later
1225 */
1226 if (rinfo->head->is_dentry &&
1227 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1228 test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1229 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1230 fsc->mount_options->snapdir_name,
1231 req->r_dentry->d_name.len))) {
1232 /*
1233 * lookup link rename : null -> possibly existing inode
1234 * mknod symlink mkdir : null -> new inode
1235 * unlink : linked -> null
1236 */
1237 struct inode *dir = req->r_parent;
1238 struct dentry *dn = req->r_dentry;
1239 bool have_dir_cap, have_lease;
1240
1241 BUG_ON(!dn);
1242 BUG_ON(!dir);
1243 BUG_ON(d_inode(dn->d_parent) != dir);
1244
1245 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1246 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1247
1248 BUG_ON(ceph_ino(dir) != dvino.ino);
1249 BUG_ON(ceph_snap(dir) != dvino.snap);
1250
1251 /* do we have a lease on the whole dir? */
1252 have_dir_cap =
1253 (le32_to_cpu(rinfo->diri.in->cap.caps) &
1254 CEPH_CAP_FILE_SHARED);
1255
1256 /* do we have a dn lease? */
1257 have_lease = have_dir_cap ||
1258 le32_to_cpu(rinfo->dlease->duration_ms);
1259 if (!have_lease)
1260 dout("fill_trace no dentry lease or dir cap\n");
1261
1262 /* rename? */
1263 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1264 struct inode *olddir = req->r_old_dentry_dir;
1265 BUG_ON(!olddir);
1266
1267 dout(" src %p '%pd' dst %p '%pd'\n",
1268 req->r_old_dentry,
1269 req->r_old_dentry,
1270 dn, dn);
1271 dout("fill_trace doing d_move %p -> %p\n",
1272 req->r_old_dentry, dn);
1273
1274 /* d_move screws up sibling dentries' offsets */
1275 ceph_dir_clear_ordered(dir);
1276 ceph_dir_clear_ordered(olddir);
1277
1278 d_move(req->r_old_dentry, dn);
1279 dout(" src %p '%pd' dst %p '%pd'\n",
1280 req->r_old_dentry,
1281 req->r_old_dentry,
1282 dn, dn);
1283
1284 /* ensure target dentry is invalidated, despite
1285 rehashing bug in vfs_rename_dir */
1286 ceph_invalidate_dentry_lease(dn);
1287
1288 dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1289 ceph_dentry(req->r_old_dentry)->offset);
1290
1291 dn = req->r_old_dentry; /* use old_dentry */
1292 }
1293
1294 /* null dentry? */
1295 if (!rinfo->head->is_target) {
1296 dout("fill_trace null dentry\n");
1297 if (d_really_is_positive(dn)) {
1298 ceph_dir_clear_ordered(dir);
1299 dout("d_delete %p\n", dn);
1300 d_delete(dn);
1301 } else if (have_lease) {
1302 if (d_unhashed(dn))
1303 d_add(dn, NULL);
1304 update_dentry_lease(dn, rinfo->dlease,
1305 session,
1306 req->r_request_started,
1307 NULL, &dvino);
1308 }
1309 goto done;
1310 }
1311
1312 /* attach proper inode */
1313 if (d_really_is_negative(dn)) {
1314 ceph_dir_clear_ordered(dir);
1315 ihold(in);
1316 dn = splice_dentry(dn, in);
1317 if (IS_ERR(dn)) {
1318 err = PTR_ERR(dn);
1319 goto done;
1320 }
1321 req->r_dentry = dn; /* may have spliced */
1322 } else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1323 dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1324 dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1325 ceph_vinop(in));
1326 ceph_dir_clear_ordered(dir);
1327 d_invalidate(dn);
1328 have_lease = false;
1329 }
1330
1331 if (have_lease) {
1332 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1333 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1334 update_dentry_lease(dn, rinfo->dlease, session,
1335 req->r_request_started,
1336 &tvino, &dvino);
1337 }
1338 dout(" final dn %p\n", dn);
1339 } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1340 req->r_op == CEPH_MDS_OP_MKSNAP) &&
1341 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1342 struct dentry *dn = req->r_dentry;
1343 struct inode *dir = req->r_parent;
1344
1345 /* fill out a snapdir LOOKUPSNAP dentry */
1346 BUG_ON(!dn);
1347 BUG_ON(!dir);
1348 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1349 dout(" linking snapped dir %p to dn %p\n", in, dn);
1350 ceph_dir_clear_ordered(dir);
1351 ihold(in);
1352 dn = splice_dentry(dn, in);
1353 if (IS_ERR(dn)) {
1354 err = PTR_ERR(dn);
1355 goto done;
1356 }
1357 req->r_dentry = dn; /* may have spliced */
1358 } else if (rinfo->head->is_dentry) {
1359 struct ceph_vino *ptvino = NULL;
1360
1361 if ((le32_to_cpu(rinfo->diri.in->cap.caps) & CEPH_CAP_FILE_SHARED) ||
1362 le32_to_cpu(rinfo->dlease->duration_ms)) {
1363 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1364 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1365
1366 if (rinfo->head->is_target) {
1367 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1368 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1369 ptvino = &tvino;
1370 }
1371
1372 update_dentry_lease(req->r_dentry, rinfo->dlease,
1373 session, req->r_request_started, ptvino,
1374 &dvino);
1375 } else {
1376 dout("%s: no dentry lease or dir cap\n", __func__);
1377 }
1378 }
1379 done:
1380 dout("fill_trace done err=%d\n", err);
1381 return err;
1382 }
1383
1384 /*
1385 * Prepopulate our cache with readdir results, leases, etc.
1386 */
1387 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1388 struct ceph_mds_session *session)
1389 {
1390 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1391 int i, err = 0;
1392
1393 for (i = 0; i < rinfo->dir_nr; i++) {
1394 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1395 struct ceph_vino vino;
1396 struct inode *in;
1397 int rc;
1398
1399 vino.ino = le64_to_cpu(rde->inode.in->ino);
1400 vino.snap = le64_to_cpu(rde->inode.in->snapid);
1401
1402 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1403 if (IS_ERR(in)) {
1404 err = PTR_ERR(in);
1405 dout("new_inode badness got %d\n", err);
1406 continue;
1407 }
1408 rc = fill_inode(in, NULL, &rde->inode, NULL, session,
1409 req->r_request_started, -1,
1410 &req->r_caps_reservation);
1411 if (rc < 0) {
1412 pr_err("fill_inode badness on %p got %d\n", in, rc);
1413 err = rc;
1414 }
1415 iput(in);
1416 }
1417
1418 return err;
1419 }
1420
1421 void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1422 {
1423 if (ctl->page) {
1424 kunmap(ctl->page);
1425 put_page(ctl->page);
1426 ctl->page = NULL;
1427 }
1428 }
1429
1430 static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1431 struct ceph_readdir_cache_control *ctl,
1432 struct ceph_mds_request *req)
1433 {
1434 struct ceph_inode_info *ci = ceph_inode(dir);
1435 unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
1436 unsigned idx = ctl->index % nsize;
1437 pgoff_t pgoff = ctl->index / nsize;
1438
1439 if (!ctl->page || pgoff != page_index(ctl->page)) {
1440 ceph_readdir_cache_release(ctl);
1441 if (idx == 0)
1442 ctl->page = grab_cache_page(&dir->i_data, pgoff);
1443 else
1444 ctl->page = find_lock_page(&dir->i_data, pgoff);
1445 if (!ctl->page) {
1446 ctl->index = -1;
1447 return idx == 0 ? -ENOMEM : 0;
1448 }
1449 /* reading/filling the cache are serialized by
1450 * i_mutex, no need to use page lock */
1451 unlock_page(ctl->page);
1452 ctl->dentries = kmap(ctl->page);
1453 if (idx == 0)
1454 memset(ctl->dentries, 0, PAGE_SIZE);
1455 }
1456
1457 if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1458 req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1459 dout("readdir cache dn %p idx %d\n", dn, ctl->index);
1460 ctl->dentries[idx] = dn;
1461 ctl->index++;
1462 } else {
1463 dout("disable readdir cache\n");
1464 ctl->index = -1;
1465 }
1466 return 0;
1467 }
1468
1469 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1470 struct ceph_mds_session *session)
1471 {
1472 struct dentry *parent = req->r_dentry;
1473 struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
1474 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1475 struct qstr dname;
1476 struct dentry *dn;
1477 struct inode *in;
1478 int err = 0, skipped = 0, ret, i;
1479 struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1480 u32 frag = le32_to_cpu(rhead->args.readdir.frag);
1481 u32 last_hash = 0;
1482 u32 fpos_offset;
1483 struct ceph_readdir_cache_control cache_ctl = {};
1484
1485 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
1486 return readdir_prepopulate_inodes_only(req, session);
1487
1488 if (rinfo->hash_order) {
1489 if (req->r_path2) {
1490 last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1491 req->r_path2,
1492 strlen(req->r_path2));
1493 last_hash = ceph_frag_value(last_hash);
1494 } else if (rinfo->offset_hash) {
1495 /* mds understands offset_hash */
1496 WARN_ON_ONCE(req->r_readdir_offset != 2);
1497 last_hash = le32_to_cpu(rhead->args.readdir.offset_hash);
1498 }
1499 }
1500
1501 if (rinfo->dir_dir &&
1502 le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1503 dout("readdir_prepopulate got new frag %x -> %x\n",
1504 frag, le32_to_cpu(rinfo->dir_dir->frag));
1505 frag = le32_to_cpu(rinfo->dir_dir->frag);
1506 if (!rinfo->hash_order)
1507 req->r_readdir_offset = 2;
1508 }
1509
1510 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1511 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1512 rinfo->dir_nr, parent);
1513 } else {
1514 dout("readdir_prepopulate %d items under dn %p\n",
1515 rinfo->dir_nr, parent);
1516 if (rinfo->dir_dir)
1517 ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1518
1519 if (ceph_frag_is_leftmost(frag) &&
1520 req->r_readdir_offset == 2 &&
1521 !(rinfo->hash_order && last_hash)) {
1522 /* note dir version at start of readdir so we can
1523 * tell if any dentries get dropped */
1524 req->r_dir_release_cnt =
1525 atomic64_read(&ci->i_release_count);
1526 req->r_dir_ordered_cnt =
1527 atomic64_read(&ci->i_ordered_count);
1528 req->r_readdir_cache_idx = 0;
1529 }
1530 }
1531
1532 cache_ctl.index = req->r_readdir_cache_idx;
1533 fpos_offset = req->r_readdir_offset;
1534
1535 /* FIXME: release caps/leases if error occurs */
1536 for (i = 0; i < rinfo->dir_nr; i++) {
1537 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1538 struct ceph_vino tvino, dvino;
1539
1540 dname.name = rde->name;
1541 dname.len = rde->name_len;
1542 dname.hash = full_name_hash(parent, dname.name, dname.len);
1543
1544 tvino.ino = le64_to_cpu(rde->inode.in->ino);
1545 tvino.snap = le64_to_cpu(rde->inode.in->snapid);
1546
1547 if (rinfo->hash_order) {
1548 u32 hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1549 rde->name, rde->name_len);
1550 hash = ceph_frag_value(hash);
1551 if (hash != last_hash)
1552 fpos_offset = 2;
1553 last_hash = hash;
1554 rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
1555 } else {
1556 rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
1557 }
1558
1559 retry_lookup:
1560 dn = d_lookup(parent, &dname);
1561 dout("d_lookup on parent=%p name=%.*s got %p\n",
1562 parent, dname.len, dname.name, dn);
1563
1564 if (!dn) {
1565 dn = d_alloc(parent, &dname);
1566 dout("d_alloc %p '%.*s' = %p\n", parent,
1567 dname.len, dname.name, dn);
1568 if (!dn) {
1569 dout("d_alloc badness\n");
1570 err = -ENOMEM;
1571 goto out;
1572 }
1573 } else if (d_really_is_positive(dn) &&
1574 (ceph_ino(d_inode(dn)) != tvino.ino ||
1575 ceph_snap(d_inode(dn)) != tvino.snap)) {
1576 dout(" dn %p points to wrong inode %p\n",
1577 dn, d_inode(dn));
1578 __ceph_dir_clear_ordered(ci);
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_positive(dn))
1604 __ceph_dir_clear_ordered(ci);
1605 else
1606 iput(in);
1607 d_drop(dn);
1608 err = ret;
1609 goto next_item;
1610 }
1611
1612 if (d_really_is_negative(dn)) {
1613 struct dentry *realdn;
1614
1615 if (ceph_security_xattr_deadlock(in)) {
1616 dout(" skip splicing dn %p to inode %p"
1617 " (security xattr deadlock)\n", dn, in);
1618 iput(in);
1619 skipped++;
1620 goto next_item;
1621 }
1622
1623 realdn = splice_dentry(dn, in);
1624 if (IS_ERR(realdn)) {
1625 err = PTR_ERR(realdn);
1626 d_drop(dn);
1627 dn = NULL;
1628 goto next_item;
1629 }
1630 dn = realdn;
1631 }
1632
1633 ceph_dentry(dn)->offset = rde->offset;
1634
1635 dvino = ceph_vino(d_inode(parent));
1636 update_dentry_lease(dn, rde->lease, req->r_session,
1637 req->r_request_started, &tvino, &dvino);
1638
1639 if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
1640 ret = fill_readdir_cache(d_inode(parent), dn,
1641 &cache_ctl, req);
1642 if (ret < 0)
1643 err = ret;
1644 }
1645 next_item:
1646 if (dn)
1647 dput(dn);
1648 }
1649 out:
1650 if (err == 0 && skipped == 0) {
1651 set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
1652 req->r_readdir_cache_idx = cache_ctl.index;
1653 }
1654 ceph_readdir_cache_release(&cache_ctl);
1655 dout("readdir_prepopulate done\n");
1656 return err;
1657 }
1658
1659 bool ceph_inode_set_size(struct inode *inode, loff_t size)
1660 {
1661 struct ceph_inode_info *ci = ceph_inode(inode);
1662 bool ret;
1663
1664 spin_lock(&ci->i_ceph_lock);
1665 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1666 i_size_write(inode, size);
1667 inode->i_blocks = calc_inode_blocks(size);
1668
1669 ret = __ceph_should_report_size(ci);
1670
1671 spin_unlock(&ci->i_ceph_lock);
1672 return ret;
1673 }
1674
1675 /*
1676 * Write back inode data in a worker thread. (This can't be done
1677 * in the message handler context.)
1678 */
1679 void ceph_queue_writeback(struct inode *inode)
1680 {
1681 ihold(inode);
1682 if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1683 &ceph_inode(inode)->i_wb_work)) {
1684 dout("ceph_queue_writeback %p\n", inode);
1685 } else {
1686 dout("ceph_queue_writeback %p failed\n", inode);
1687 iput(inode);
1688 }
1689 }
1690
1691 static void ceph_writeback_work(struct work_struct *work)
1692 {
1693 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1694 i_wb_work);
1695 struct inode *inode = &ci->vfs_inode;
1696
1697 dout("writeback %p\n", inode);
1698 filemap_fdatawrite(&inode->i_data);
1699 iput(inode);
1700 }
1701
1702 /*
1703 * queue an async invalidation
1704 */
1705 void ceph_queue_invalidate(struct inode *inode)
1706 {
1707 ihold(inode);
1708 if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1709 &ceph_inode(inode)->i_pg_inv_work)) {
1710 dout("ceph_queue_invalidate %p\n", inode);
1711 } else {
1712 dout("ceph_queue_invalidate %p failed\n", inode);
1713 iput(inode);
1714 }
1715 }
1716
1717 /*
1718 * Invalidate inode pages in a worker thread. (This can't be done
1719 * in the message handler context.)
1720 */
1721 static void ceph_invalidate_work(struct work_struct *work)
1722 {
1723 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1724 i_pg_inv_work);
1725 struct inode *inode = &ci->vfs_inode;
1726 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1727 u32 orig_gen;
1728 int check = 0;
1729
1730 mutex_lock(&ci->i_truncate_mutex);
1731
1732 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
1733 pr_warn_ratelimited("invalidate_pages %p %lld forced umount\n",
1734 inode, ceph_ino(inode));
1735 mapping_set_error(inode->i_mapping, -EIO);
1736 truncate_pagecache(inode, 0);
1737 mutex_unlock(&ci->i_truncate_mutex);
1738 goto out;
1739 }
1740
1741 spin_lock(&ci->i_ceph_lock);
1742 dout("invalidate_pages %p gen %d revoking %d\n", inode,
1743 ci->i_rdcache_gen, ci->i_rdcache_revoking);
1744 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1745 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1746 check = 1;
1747 spin_unlock(&ci->i_ceph_lock);
1748 mutex_unlock(&ci->i_truncate_mutex);
1749 goto out;
1750 }
1751 orig_gen = ci->i_rdcache_gen;
1752 spin_unlock(&ci->i_ceph_lock);
1753
1754 if (invalidate_inode_pages2(inode->i_mapping) < 0) {
1755 pr_err("invalidate_pages %p fails\n", inode);
1756 }
1757
1758 spin_lock(&ci->i_ceph_lock);
1759 if (orig_gen == ci->i_rdcache_gen &&
1760 orig_gen == ci->i_rdcache_revoking) {
1761 dout("invalidate_pages %p gen %d successful\n", inode,
1762 ci->i_rdcache_gen);
1763 ci->i_rdcache_revoking--;
1764 check = 1;
1765 } else {
1766 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1767 inode, orig_gen, ci->i_rdcache_gen,
1768 ci->i_rdcache_revoking);
1769 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1770 check = 1;
1771 }
1772 spin_unlock(&ci->i_ceph_lock);
1773 mutex_unlock(&ci->i_truncate_mutex);
1774 out:
1775 if (check)
1776 ceph_check_caps(ci, 0, NULL);
1777 iput(inode);
1778 }
1779
1780
1781 /*
1782 * called by trunc_wq;
1783 *
1784 * We also truncate in a separate thread as well.
1785 */
1786 static void ceph_vmtruncate_work(struct work_struct *work)
1787 {
1788 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1789 i_vmtruncate_work);
1790 struct inode *inode = &ci->vfs_inode;
1791
1792 dout("vmtruncate_work %p\n", inode);
1793 __ceph_do_pending_vmtruncate(inode);
1794 iput(inode);
1795 }
1796
1797 /*
1798 * Queue an async vmtruncate. If we fail to queue work, we will handle
1799 * the truncation the next time we call __ceph_do_pending_vmtruncate.
1800 */
1801 void ceph_queue_vmtruncate(struct inode *inode)
1802 {
1803 struct ceph_inode_info *ci = ceph_inode(inode);
1804
1805 ihold(inode);
1806
1807 if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1808 &ci->i_vmtruncate_work)) {
1809 dout("ceph_queue_vmtruncate %p\n", inode);
1810 } else {
1811 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1812 inode, ci->i_truncate_pending);
1813 iput(inode);
1814 }
1815 }
1816
1817 /*
1818 * Make sure any pending truncation is applied before doing anything
1819 * that may depend on it.
1820 */
1821 void __ceph_do_pending_vmtruncate(struct inode *inode)
1822 {
1823 struct ceph_inode_info *ci = ceph_inode(inode);
1824 u64 to;
1825 int wrbuffer_refs, finish = 0;
1826
1827 mutex_lock(&ci->i_truncate_mutex);
1828 retry:
1829 spin_lock(&ci->i_ceph_lock);
1830 if (ci->i_truncate_pending == 0) {
1831 dout("__do_pending_vmtruncate %p none pending\n", inode);
1832 spin_unlock(&ci->i_ceph_lock);
1833 mutex_unlock(&ci->i_truncate_mutex);
1834 return;
1835 }
1836
1837 /*
1838 * make sure any dirty snapped pages are flushed before we
1839 * possibly truncate them.. so write AND block!
1840 */
1841 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1842 struct ceph_cap_snap *capsnap;
1843 to = ci->i_truncate_size;
1844 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
1845 // MDS should have revoked Frw caps
1846 WARN_ON_ONCE(capsnap->writing);
1847 if (capsnap->dirty_pages && capsnap->size > to)
1848 to = capsnap->size;
1849 }
1850 spin_unlock(&ci->i_ceph_lock);
1851 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1852 inode);
1853
1854 truncate_pagecache(inode, to);
1855
1856 filemap_write_and_wait_range(&inode->i_data, 0,
1857 inode->i_sb->s_maxbytes);
1858 goto retry;
1859 }
1860
1861 /* there should be no reader or writer */
1862 WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1863
1864 to = ci->i_truncate_size;
1865 wrbuffer_refs = ci->i_wrbuffer_ref;
1866 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1867 ci->i_truncate_pending, to);
1868 spin_unlock(&ci->i_ceph_lock);
1869
1870 truncate_pagecache(inode, to);
1871
1872 spin_lock(&ci->i_ceph_lock);
1873 if (to == ci->i_truncate_size) {
1874 ci->i_truncate_pending = 0;
1875 finish = 1;
1876 }
1877 spin_unlock(&ci->i_ceph_lock);
1878 if (!finish)
1879 goto retry;
1880
1881 mutex_unlock(&ci->i_truncate_mutex);
1882
1883 if (wrbuffer_refs == 0)
1884 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1885
1886 wake_up_all(&ci->i_cap_wq);
1887 }
1888
1889 /*
1890 * symlinks
1891 */
1892 static const struct inode_operations ceph_symlink_iops = {
1893 .get_link = simple_get_link,
1894 .setattr = ceph_setattr,
1895 .getattr = ceph_getattr,
1896 .listxattr = ceph_listxattr,
1897 };
1898
1899 int __ceph_setattr(struct inode *inode, struct iattr *attr)
1900 {
1901 struct ceph_inode_info *ci = ceph_inode(inode);
1902 const unsigned int ia_valid = attr->ia_valid;
1903 struct ceph_mds_request *req;
1904 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1905 struct ceph_cap_flush *prealloc_cf;
1906 int issued;
1907 int release = 0, dirtied = 0;
1908 int mask = 0;
1909 int err = 0;
1910 int inode_dirty_flags = 0;
1911 bool lock_snap_rwsem = false;
1912
1913 prealloc_cf = ceph_alloc_cap_flush();
1914 if (!prealloc_cf)
1915 return -ENOMEM;
1916
1917 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1918 USE_AUTH_MDS);
1919 if (IS_ERR(req)) {
1920 ceph_free_cap_flush(prealloc_cf);
1921 return PTR_ERR(req);
1922 }
1923
1924 spin_lock(&ci->i_ceph_lock);
1925 issued = __ceph_caps_issued(ci, NULL);
1926
1927 if (!ci->i_head_snapc &&
1928 (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
1929 lock_snap_rwsem = true;
1930 if (!down_read_trylock(&mdsc->snap_rwsem)) {
1931 spin_unlock(&ci->i_ceph_lock);
1932 down_read(&mdsc->snap_rwsem);
1933 spin_lock(&ci->i_ceph_lock);
1934 issued = __ceph_caps_issued(ci, NULL);
1935 }
1936 }
1937
1938 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1939
1940 if (ia_valid & ATTR_UID) {
1941 dout("setattr %p uid %d -> %d\n", inode,
1942 from_kuid(&init_user_ns, inode->i_uid),
1943 from_kuid(&init_user_ns, attr->ia_uid));
1944 if (issued & CEPH_CAP_AUTH_EXCL) {
1945 inode->i_uid = attr->ia_uid;
1946 dirtied |= CEPH_CAP_AUTH_EXCL;
1947 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1948 !uid_eq(attr->ia_uid, inode->i_uid)) {
1949 req->r_args.setattr.uid = cpu_to_le32(
1950 from_kuid(&init_user_ns, attr->ia_uid));
1951 mask |= CEPH_SETATTR_UID;
1952 release |= CEPH_CAP_AUTH_SHARED;
1953 }
1954 }
1955 if (ia_valid & ATTR_GID) {
1956 dout("setattr %p gid %d -> %d\n", inode,
1957 from_kgid(&init_user_ns, inode->i_gid),
1958 from_kgid(&init_user_ns, attr->ia_gid));
1959 if (issued & CEPH_CAP_AUTH_EXCL) {
1960 inode->i_gid = attr->ia_gid;
1961 dirtied |= CEPH_CAP_AUTH_EXCL;
1962 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1963 !gid_eq(attr->ia_gid, inode->i_gid)) {
1964 req->r_args.setattr.gid = cpu_to_le32(
1965 from_kgid(&init_user_ns, attr->ia_gid));
1966 mask |= CEPH_SETATTR_GID;
1967 release |= CEPH_CAP_AUTH_SHARED;
1968 }
1969 }
1970 if (ia_valid & ATTR_MODE) {
1971 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1972 attr->ia_mode);
1973 if (issued & CEPH_CAP_AUTH_EXCL) {
1974 inode->i_mode = attr->ia_mode;
1975 dirtied |= CEPH_CAP_AUTH_EXCL;
1976 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1977 attr->ia_mode != inode->i_mode) {
1978 inode->i_mode = attr->ia_mode;
1979 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1980 mask |= CEPH_SETATTR_MODE;
1981 release |= CEPH_CAP_AUTH_SHARED;
1982 }
1983 }
1984
1985 if (ia_valid & ATTR_ATIME) {
1986 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1987 inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1988 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1989 if (issued & CEPH_CAP_FILE_EXCL) {
1990 ci->i_time_warp_seq++;
1991 inode->i_atime = attr->ia_atime;
1992 dirtied |= CEPH_CAP_FILE_EXCL;
1993 } else if ((issued & CEPH_CAP_FILE_WR) &&
1994 timespec_compare(&inode->i_atime,
1995 &attr->ia_atime) < 0) {
1996 inode->i_atime = attr->ia_atime;
1997 dirtied |= CEPH_CAP_FILE_WR;
1998 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1999 !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
2000 ceph_encode_timespec(&req->r_args.setattr.atime,
2001 &attr->ia_atime);
2002 mask |= CEPH_SETATTR_ATIME;
2003 release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
2004 CEPH_CAP_FILE_WR;
2005 }
2006 }
2007 if (ia_valid & ATTR_MTIME) {
2008 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
2009 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
2010 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
2011 if (issued & CEPH_CAP_FILE_EXCL) {
2012 ci->i_time_warp_seq++;
2013 inode->i_mtime = attr->ia_mtime;
2014 dirtied |= CEPH_CAP_FILE_EXCL;
2015 } else if ((issued & CEPH_CAP_FILE_WR) &&
2016 timespec_compare(&inode->i_mtime,
2017 &attr->ia_mtime) < 0) {
2018 inode->i_mtime = attr->ia_mtime;
2019 dirtied |= CEPH_CAP_FILE_WR;
2020 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2021 !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
2022 ceph_encode_timespec(&req->r_args.setattr.mtime,
2023 &attr->ia_mtime);
2024 mask |= CEPH_SETATTR_MTIME;
2025 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
2026 CEPH_CAP_FILE_WR;
2027 }
2028 }
2029 if (ia_valid & ATTR_SIZE) {
2030 dout("setattr %p size %lld -> %lld\n", inode,
2031 inode->i_size, attr->ia_size);
2032 if ((issued & CEPH_CAP_FILE_EXCL) &&
2033 attr->ia_size > inode->i_size) {
2034 i_size_write(inode, attr->ia_size);
2035 inode->i_blocks = calc_inode_blocks(attr->ia_size);
2036 ci->i_reported_size = attr->ia_size;
2037 dirtied |= CEPH_CAP_FILE_EXCL;
2038 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2039 attr->ia_size != inode->i_size) {
2040 req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
2041 req->r_args.setattr.old_size =
2042 cpu_to_le64(inode->i_size);
2043 mask |= CEPH_SETATTR_SIZE;
2044 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
2045 CEPH_CAP_FILE_WR;
2046 }
2047 }
2048
2049 /* these do nothing */
2050 if (ia_valid & ATTR_CTIME) {
2051 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
2052 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
2053 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
2054 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
2055 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
2056 only ? "ctime only" : "ignored");
2057 if (only) {
2058 /*
2059 * if kernel wants to dirty ctime but nothing else,
2060 * we need to choose a cap to dirty under, or do
2061 * a almost-no-op setattr
2062 */
2063 if (issued & CEPH_CAP_AUTH_EXCL)
2064 dirtied |= CEPH_CAP_AUTH_EXCL;
2065 else if (issued & CEPH_CAP_FILE_EXCL)
2066 dirtied |= CEPH_CAP_FILE_EXCL;
2067 else if (issued & CEPH_CAP_XATTR_EXCL)
2068 dirtied |= CEPH_CAP_XATTR_EXCL;
2069 else
2070 mask |= CEPH_SETATTR_CTIME;
2071 }
2072 }
2073 if (ia_valid & ATTR_FILE)
2074 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
2075
2076 if (dirtied) {
2077 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
2078 &prealloc_cf);
2079 inode->i_ctime = attr->ia_ctime;
2080 }
2081
2082 release &= issued;
2083 spin_unlock(&ci->i_ceph_lock);
2084 if (lock_snap_rwsem)
2085 up_read(&mdsc->snap_rwsem);
2086
2087 if (inode_dirty_flags)
2088 __mark_inode_dirty(inode, inode_dirty_flags);
2089
2090
2091 if (mask) {
2092 req->r_inode = inode;
2093 ihold(inode);
2094 req->r_inode_drop = release;
2095 req->r_args.setattr.mask = cpu_to_le32(mask);
2096 req->r_num_caps = 1;
2097 req->r_stamp = attr->ia_ctime;
2098 err = ceph_mdsc_do_request(mdsc, NULL, req);
2099 }
2100 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
2101 ceph_cap_string(dirtied), mask);
2102
2103 ceph_mdsc_put_request(req);
2104 ceph_free_cap_flush(prealloc_cf);
2105
2106 if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
2107 __ceph_do_pending_vmtruncate(inode);
2108
2109 return err;
2110 }
2111
2112 /*
2113 * setattr
2114 */
2115 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
2116 {
2117 struct inode *inode = d_inode(dentry);
2118 int err;
2119
2120 if (ceph_snap(inode) != CEPH_NOSNAP)
2121 return -EROFS;
2122
2123 err = setattr_prepare(dentry, attr);
2124 if (err != 0)
2125 return err;
2126
2127 err = __ceph_setattr(inode, attr);
2128
2129 if (err >= 0 && (attr->ia_valid & ATTR_MODE))
2130 err = posix_acl_chmod(inode, attr->ia_mode);
2131
2132 return err;
2133 }
2134
2135 /*
2136 * Verify that we have a lease on the given mask. If not,
2137 * do a getattr against an mds.
2138 */
2139 int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2140 int mask, bool force)
2141 {
2142 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2143 struct ceph_mds_client *mdsc = fsc->mdsc;
2144 struct ceph_mds_request *req;
2145 int err;
2146
2147 if (ceph_snap(inode) == CEPH_SNAPDIR) {
2148 dout("do_getattr inode %p SNAPDIR\n", inode);
2149 return 0;
2150 }
2151
2152 dout("do_getattr inode %p mask %s mode 0%o\n",
2153 inode, ceph_cap_string(mask), inode->i_mode);
2154 if (!force && ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
2155 return 0;
2156
2157 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
2158 if (IS_ERR(req))
2159 return PTR_ERR(req);
2160 req->r_inode = inode;
2161 ihold(inode);
2162 req->r_num_caps = 1;
2163 req->r_args.getattr.mask = cpu_to_le32(mask);
2164 req->r_locked_page = locked_page;
2165 err = ceph_mdsc_do_request(mdsc, NULL, req);
2166 if (locked_page && err == 0) {
2167 u64 inline_version = req->r_reply_info.targeti.inline_version;
2168 if (inline_version == 0) {
2169 /* the reply is supposed to contain inline data */
2170 err = -EINVAL;
2171 } else if (inline_version == CEPH_INLINE_NONE) {
2172 err = -ENODATA;
2173 } else {
2174 err = req->r_reply_info.targeti.inline_len;
2175 }
2176 }
2177 ceph_mdsc_put_request(req);
2178 dout("do_getattr result=%d\n", err);
2179 return err;
2180 }
2181
2182
2183 /*
2184 * Check inode permissions. We verify we have a valid value for
2185 * the AUTH cap, then call the generic handler.
2186 */
2187 int ceph_permission(struct inode *inode, int mask)
2188 {
2189 int err;
2190
2191 if (mask & MAY_NOT_BLOCK)
2192 return -ECHILD;
2193
2194 err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
2195
2196 if (!err)
2197 err = generic_permission(inode, mask);
2198 return err;
2199 }
2200
2201 /*
2202 * Get all attributes. Hopefully somedata we'll have a statlite()
2203 * and can limit the fields we require to be accurate.
2204 */
2205 int ceph_getattr(const struct path *path, struct kstat *stat,
2206 u32 request_mask, unsigned int flags)
2207 {
2208 struct inode *inode = d_inode(path->dentry);
2209 struct ceph_inode_info *ci = ceph_inode(inode);
2210 int err;
2211
2212 err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL, false);
2213 if (!err) {
2214 generic_fillattr(inode, stat);
2215 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
2216 if (ceph_snap(inode) != CEPH_NOSNAP)
2217 stat->dev = ceph_snap(inode);
2218 else
2219 stat->dev = 0;
2220 if (S_ISDIR(inode->i_mode)) {
2221 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
2222 RBYTES))
2223 stat->size = ci->i_rbytes;
2224 else
2225 stat->size = ci->i_files + ci->i_subdirs;
2226 stat->blocks = 0;
2227 stat->blksize = 65536;
2228 }
2229 }
2230 return err;
2231 }
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