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