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