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ext4: fix interaction between i_size, fallocate, and delalloc after a crash
[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)
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 return ERR_PTR(-ENOMEM);
138
139 frag->frag = f;
140 frag->split_by = 0;
141 frag->mds = -1;
142 frag->ndist = 0;
143
144 rb_link_node(&frag->node, parent, p);
145 rb_insert_color(&frag->node, &ci->i_fragtree);
146
147 dout("get_or_create_frag added %llx.%llx frag %x\n",
148 ceph_vinop(&ci->vfs_inode), f);
149 return frag;
150 }
151
152 /*
153 * find a specific frag @f
154 */
155 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
156 {
157 struct rb_node *n = ci->i_fragtree.rb_node;
158
159 while (n) {
160 struct ceph_inode_frag *frag =
161 rb_entry(n, struct ceph_inode_frag, node);
162 int c = ceph_frag_compare(f, frag->frag);
163 if (c < 0)
164 n = n->rb_left;
165 else if (c > 0)
166 n = n->rb_right;
167 else
168 return frag;
169 }
170 return NULL;
171 }
172
173 /*
174 * Choose frag containing the given value @v. If @pfrag is
175 * specified, copy the frag delegation info to the caller if
176 * it is present.
177 */
178 static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
179 struct ceph_inode_frag *pfrag, int *found)
180 {
181 u32 t = ceph_frag_make(0, 0);
182 struct ceph_inode_frag *frag;
183 unsigned nway, i;
184 u32 n;
185
186 if (found)
187 *found = 0;
188
189 while (1) {
190 WARN_ON(!ceph_frag_contains_value(t, v));
191 frag = __ceph_find_frag(ci, t);
192 if (!frag)
193 break; /* t is a leaf */
194 if (frag->split_by == 0) {
195 if (pfrag)
196 memcpy(pfrag, frag, sizeof(*pfrag));
197 if (found)
198 *found = 1;
199 break;
200 }
201
202 /* choose child */
203 nway = 1 << frag->split_by;
204 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
205 frag->split_by, nway);
206 for (i = 0; i < nway; i++) {
207 n = ceph_frag_make_child(t, frag->split_by, i);
208 if (ceph_frag_contains_value(n, v)) {
209 t = n;
210 break;
211 }
212 }
213 BUG_ON(i == nway);
214 }
215 dout("choose_frag(%x) = %x\n", v, t);
216
217 return t;
218 }
219
220 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
221 struct ceph_inode_frag *pfrag, int *found)
222 {
223 u32 ret;
224 mutex_lock(&ci->i_fragtree_mutex);
225 ret = __ceph_choose_frag(ci, v, pfrag, found);
226 mutex_unlock(&ci->i_fragtree_mutex);
227 return ret;
228 }
229
230 /*
231 * Process dirfrag (delegation) info from the mds. Include leaf
232 * fragment in tree ONLY if ndist > 0. Otherwise, only
233 * branches/splits are included in i_fragtree)
234 */
235 static int ceph_fill_dirfrag(struct inode *inode,
236 struct ceph_mds_reply_dirfrag *dirinfo)
237 {
238 struct ceph_inode_info *ci = ceph_inode(inode);
239 struct ceph_inode_frag *frag;
240 u32 id = le32_to_cpu(dirinfo->frag);
241 int mds = le32_to_cpu(dirinfo->auth);
242 int ndist = le32_to_cpu(dirinfo->ndist);
243 int diri_auth = -1;
244 int i;
245 int err = 0;
246
247 spin_lock(&ci->i_ceph_lock);
248 if (ci->i_auth_cap)
249 diri_auth = ci->i_auth_cap->mds;
250 spin_unlock(&ci->i_ceph_lock);
251
252 if (mds == -1) /* CDIR_AUTH_PARENT */
253 mds = diri_auth;
254
255 mutex_lock(&ci->i_fragtree_mutex);
256 if (ndist == 0 && mds == diri_auth) {
257 /* no delegation info needed. */
258 frag = __ceph_find_frag(ci, id);
259 if (!frag)
260 goto out;
261 if (frag->split_by == 0) {
262 /* tree leaf, remove */
263 dout("fill_dirfrag removed %llx.%llx frag %x"
264 " (no ref)\n", ceph_vinop(inode), id);
265 rb_erase(&frag->node, &ci->i_fragtree);
266 kfree(frag);
267 } else {
268 /* tree branch, keep and clear */
269 dout("fill_dirfrag cleared %llx.%llx frag %x"
270 " referral\n", ceph_vinop(inode), id);
271 frag->mds = -1;
272 frag->ndist = 0;
273 }
274 goto out;
275 }
276
277
278 /* find/add this frag to store mds delegation info */
279 frag = __get_or_create_frag(ci, id);
280 if (IS_ERR(frag)) {
281 /* this is not the end of the world; we can continue
282 with bad/inaccurate delegation info */
283 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
284 ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
285 err = -ENOMEM;
286 goto out;
287 }
288
289 frag->mds = mds;
290 frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
291 for (i = 0; i < frag->ndist; i++)
292 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
293 dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
294 ceph_vinop(inode), frag->frag, frag->ndist);
295
296 out:
297 mutex_unlock(&ci->i_fragtree_mutex);
298 return err;
299 }
300
301 static int frag_tree_split_cmp(const void *l, const void *r)
302 {
303 struct ceph_frag_tree_split *ls = (struct ceph_frag_tree_split*)l;
304 struct ceph_frag_tree_split *rs = (struct ceph_frag_tree_split*)r;
305 return ceph_frag_compare(le32_to_cpu(ls->frag),
306 le32_to_cpu(rs->frag));
307 }
308
309 static bool is_frag_child(u32 f, struct ceph_inode_frag *frag)
310 {
311 if (!frag)
312 return f == ceph_frag_make(0, 0);
313 if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by)
314 return false;
315 return ceph_frag_contains_value(frag->frag, ceph_frag_value(f));
316 }
317
318 static int ceph_fill_fragtree(struct inode *inode,
319 struct ceph_frag_tree_head *fragtree,
320 struct ceph_mds_reply_dirfrag *dirinfo)
321 {
322 struct ceph_inode_info *ci = ceph_inode(inode);
323 struct ceph_inode_frag *frag, *prev_frag = NULL;
324 struct rb_node *rb_node;
325 unsigned i, split_by, nsplits;
326 u32 id;
327 bool update = false;
328
329 mutex_lock(&ci->i_fragtree_mutex);
330 nsplits = le32_to_cpu(fragtree->nsplits);
331 if (nsplits != ci->i_fragtree_nsplits) {
332 update = true;
333 } else if (nsplits) {
334 i = prandom_u32() % nsplits;
335 id = le32_to_cpu(fragtree->splits[i].frag);
336 if (!__ceph_find_frag(ci, id))
337 update = true;
338 } else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) {
339 rb_node = rb_first(&ci->i_fragtree);
340 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
341 if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node))
342 update = true;
343 }
344 if (!update && dirinfo) {
345 id = le32_to_cpu(dirinfo->frag);
346 if (id != __ceph_choose_frag(ci, id, NULL, NULL))
347 update = true;
348 }
349 if (!update)
350 goto out_unlock;
351
352 if (nsplits > 1) {
353 sort(fragtree->splits, nsplits, sizeof(fragtree->splits[0]),
354 frag_tree_split_cmp, NULL);
355 }
356
357 dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode));
358 rb_node = rb_first(&ci->i_fragtree);
359 for (i = 0; i < nsplits; i++) {
360 id = le32_to_cpu(fragtree->splits[i].frag);
361 split_by = le32_to_cpu(fragtree->splits[i].by);
362 if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) {
363 pr_err("fill_fragtree %llx.%llx invalid split %d/%u, "
364 "frag %x split by %d\n", ceph_vinop(inode),
365 i, nsplits, id, split_by);
366 continue;
367 }
368 frag = NULL;
369 while (rb_node) {
370 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
371 if (ceph_frag_compare(frag->frag, id) >= 0) {
372 if (frag->frag != id)
373 frag = NULL;
374 else
375 rb_node = rb_next(rb_node);
376 break;
377 }
378 rb_node = rb_next(rb_node);
379 /* delete stale split/leaf node */
380 if (frag->split_by > 0 ||
381 !is_frag_child(frag->frag, prev_frag)) {
382 rb_erase(&frag->node, &ci->i_fragtree);
383 if (frag->split_by > 0)
384 ci->i_fragtree_nsplits--;
385 kfree(frag);
386 }
387 frag = NULL;
388 }
389 if (!frag) {
390 frag = __get_or_create_frag(ci, id);
391 if (IS_ERR(frag))
392 continue;
393 }
394 if (frag->split_by == 0)
395 ci->i_fragtree_nsplits++;
396 frag->split_by = split_by;
397 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
398 prev_frag = frag;
399 }
400 while (rb_node) {
401 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
402 rb_node = rb_next(rb_node);
403 /* delete stale split/leaf node */
404 if (frag->split_by > 0 ||
405 !is_frag_child(frag->frag, prev_frag)) {
406 rb_erase(&frag->node, &ci->i_fragtree);
407 if (frag->split_by > 0)
408 ci->i_fragtree_nsplits--;
409 kfree(frag);
410 }
411 }
412 out_unlock:
413 mutex_unlock(&ci->i_fragtree_mutex);
414 return 0;
415 }
416
417 /*
418 * initialize a newly allocated inode.
419 */
420 struct inode *ceph_alloc_inode(struct super_block *sb)
421 {
422 struct ceph_inode_info *ci;
423 int i;
424
425 ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
426 if (!ci)
427 return NULL;
428
429 dout("alloc_inode %p\n", &ci->vfs_inode);
430
431 spin_lock_init(&ci->i_ceph_lock);
432
433 ci->i_version = 0;
434 ci->i_inline_version = 0;
435 ci->i_time_warp_seq = 0;
436 ci->i_ceph_flags = 0;
437 atomic64_set(&ci->i_ordered_count, 1);
438 atomic64_set(&ci->i_release_count, 1);
439 atomic64_set(&ci->i_complete_seq[0], 0);
440 atomic64_set(&ci->i_complete_seq[1], 0);
441 ci->i_symlink = NULL;
442
443 memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
444 RCU_INIT_POINTER(ci->i_layout.pool_ns, NULL);
445
446 ci->i_fragtree = RB_ROOT;
447 mutex_init(&ci->i_fragtree_mutex);
448
449 ci->i_xattrs.blob = NULL;
450 ci->i_xattrs.prealloc_blob = NULL;
451 ci->i_xattrs.dirty = false;
452 ci->i_xattrs.index = RB_ROOT;
453 ci->i_xattrs.count = 0;
454 ci->i_xattrs.names_size = 0;
455 ci->i_xattrs.vals_size = 0;
456 ci->i_xattrs.version = 0;
457 ci->i_xattrs.index_version = 0;
458
459 ci->i_caps = RB_ROOT;
460 ci->i_auth_cap = NULL;
461 ci->i_dirty_caps = 0;
462 ci->i_flushing_caps = 0;
463 INIT_LIST_HEAD(&ci->i_dirty_item);
464 INIT_LIST_HEAD(&ci->i_flushing_item);
465 ci->i_prealloc_cap_flush = NULL;
466 INIT_LIST_HEAD(&ci->i_cap_flush_list);
467 init_waitqueue_head(&ci->i_cap_wq);
468 ci->i_hold_caps_min = 0;
469 ci->i_hold_caps_max = 0;
470 INIT_LIST_HEAD(&ci->i_cap_delay_list);
471 INIT_LIST_HEAD(&ci->i_cap_snaps);
472 ci->i_head_snapc = NULL;
473 ci->i_snap_caps = 0;
474
475 for (i = 0; i < CEPH_FILE_MODE_BITS; i++)
476 ci->i_nr_by_mode[i] = 0;
477
478 mutex_init(&ci->i_truncate_mutex);
479 ci->i_truncate_seq = 0;
480 ci->i_truncate_size = 0;
481 ci->i_truncate_pending = 0;
482
483 ci->i_max_size = 0;
484 ci->i_reported_size = 0;
485 ci->i_wanted_max_size = 0;
486 ci->i_requested_max_size = 0;
487
488 ci->i_pin_ref = 0;
489 ci->i_rd_ref = 0;
490 ci->i_rdcache_ref = 0;
491 ci->i_wr_ref = 0;
492 ci->i_wb_ref = 0;
493 ci->i_wrbuffer_ref = 0;
494 ci->i_wrbuffer_ref_head = 0;
495 ci->i_shared_gen = 0;
496 ci->i_rdcache_gen = 0;
497 ci->i_rdcache_revoking = 0;
498
499 INIT_LIST_HEAD(&ci->i_unsafe_dirops);
500 INIT_LIST_HEAD(&ci->i_unsafe_iops);
501 spin_lock_init(&ci->i_unsafe_lock);
502
503 ci->i_snap_realm = NULL;
504 INIT_LIST_HEAD(&ci->i_snap_realm_item);
505 INIT_LIST_HEAD(&ci->i_snap_flush_item);
506
507 INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
508 INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
509
510 INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
511
512 ceph_fscache_inode_init(ci);
513
514 return &ci->vfs_inode;
515 }
516
517 static void ceph_i_callback(struct rcu_head *head)
518 {
519 struct inode *inode = container_of(head, struct inode, i_rcu);
520 struct ceph_inode_info *ci = ceph_inode(inode);
521
522 kmem_cache_free(ceph_inode_cachep, ci);
523 }
524
525 void ceph_destroy_inode(struct inode *inode)
526 {
527 struct ceph_inode_info *ci = ceph_inode(inode);
528 struct ceph_inode_frag *frag;
529 struct rb_node *n;
530
531 dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
532
533 ceph_fscache_unregister_inode_cookie(ci);
534
535 ceph_queue_caps_release(inode);
536
537 /*
538 * we may still have a snap_realm reference if there are stray
539 * caps in i_snap_caps.
540 */
541 if (ci->i_snap_realm) {
542 struct ceph_mds_client *mdsc =
543 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
544 struct ceph_snap_realm *realm = ci->i_snap_realm;
545
546 dout(" dropping residual ref to snap realm %p\n", realm);
547 spin_lock(&realm->inodes_with_caps_lock);
548 list_del_init(&ci->i_snap_realm_item);
549 spin_unlock(&realm->inodes_with_caps_lock);
550 ceph_put_snap_realm(mdsc, realm);
551 }
552
553 kfree(ci->i_symlink);
554 while ((n = rb_first(&ci->i_fragtree)) != NULL) {
555 frag = rb_entry(n, struct ceph_inode_frag, node);
556 rb_erase(n, &ci->i_fragtree);
557 kfree(frag);
558 }
559 ci->i_fragtree_nsplits = 0;
560
561 __ceph_destroy_xattrs(ci);
562 if (ci->i_xattrs.blob)
563 ceph_buffer_put(ci->i_xattrs.blob);
564 if (ci->i_xattrs.prealloc_blob)
565 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
566
567 ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns));
568
569 call_rcu(&inode->i_rcu, ceph_i_callback);
570 }
571
572 int ceph_drop_inode(struct inode *inode)
573 {
574 /*
575 * Positve dentry and corresponding inode are always accompanied
576 * in MDS reply. So no need to keep inode in the cache after
577 * dropping all its aliases.
578 */
579 return 1;
580 }
581
582 static inline blkcnt_t calc_inode_blocks(u64 size)
583 {
584 return (size + (1<<9) - 1) >> 9;
585 }
586
587 /*
588 * Helpers to fill in size, ctime, mtime, and atime. We have to be
589 * careful because either the client or MDS may have more up to date
590 * info, depending on which capabilities are held, and whether
591 * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime
592 * and size are monotonically increasing, except when utimes() or
593 * truncate() increments the corresponding _seq values.)
594 */
595 int ceph_fill_file_size(struct inode *inode, int issued,
596 u32 truncate_seq, u64 truncate_size, u64 size)
597 {
598 struct ceph_inode_info *ci = ceph_inode(inode);
599 int queue_trunc = 0;
600
601 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
602 (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
603 dout("size %lld -> %llu\n", inode->i_size, size);
604 if (size > 0 && S_ISDIR(inode->i_mode)) {
605 pr_err("fill_file_size non-zero size for directory\n");
606 size = 0;
607 }
608 i_size_write(inode, size);
609 inode->i_blocks = calc_inode_blocks(size);
610 ci->i_reported_size = size;
611 if (truncate_seq != ci->i_truncate_seq) {
612 dout("truncate_seq %u -> %u\n",
613 ci->i_truncate_seq, truncate_seq);
614 ci->i_truncate_seq = truncate_seq;
615
616 /* the MDS should have revoked these caps */
617 WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
618 CEPH_CAP_FILE_RD |
619 CEPH_CAP_FILE_WR |
620 CEPH_CAP_FILE_LAZYIO));
621 /*
622 * If we hold relevant caps, or in the case where we're
623 * not the only client referencing this file and we
624 * don't hold those caps, then we need to check whether
625 * the file is either opened or mmaped
626 */
627 if ((issued & (CEPH_CAP_FILE_CACHE|
628 CEPH_CAP_FILE_BUFFER)) ||
629 mapping_mapped(inode->i_mapping) ||
630 __ceph_caps_file_wanted(ci)) {
631 ci->i_truncate_pending++;
632 queue_trunc = 1;
633 }
634 }
635 }
636 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
637 ci->i_truncate_size != truncate_size) {
638 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
639 truncate_size);
640 ci->i_truncate_size = truncate_size;
641 }
642
643 if (queue_trunc)
644 ceph_fscache_invalidate(inode);
645
646 return queue_trunc;
647 }
648
649 void ceph_fill_file_time(struct inode *inode, int issued,
650 u64 time_warp_seq, struct timespec *ctime,
651 struct timespec *mtime, struct timespec *atime)
652 {
653 struct ceph_inode_info *ci = ceph_inode(inode);
654 int warn = 0;
655
656 if (issued & (CEPH_CAP_FILE_EXCL|
657 CEPH_CAP_FILE_WR|
658 CEPH_CAP_FILE_BUFFER|
659 CEPH_CAP_AUTH_EXCL|
660 CEPH_CAP_XATTR_EXCL)) {
661 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
662 dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
663 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
664 ctime->tv_sec, ctime->tv_nsec);
665 inode->i_ctime = *ctime;
666 }
667 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
668 /* the MDS did a utimes() */
669 dout("mtime %ld.%09ld -> %ld.%09ld "
670 "tw %d -> %d\n",
671 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
672 mtime->tv_sec, mtime->tv_nsec,
673 ci->i_time_warp_seq, (int)time_warp_seq);
674
675 inode->i_mtime = *mtime;
676 inode->i_atime = *atime;
677 ci->i_time_warp_seq = time_warp_seq;
678 } else if (time_warp_seq == ci->i_time_warp_seq) {
679 /* nobody did utimes(); take the max */
680 if (timespec_compare(mtime, &inode->i_mtime) > 0) {
681 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
682 inode->i_mtime.tv_sec,
683 inode->i_mtime.tv_nsec,
684 mtime->tv_sec, mtime->tv_nsec);
685 inode->i_mtime = *mtime;
686 }
687 if (timespec_compare(atime, &inode->i_atime) > 0) {
688 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
689 inode->i_atime.tv_sec,
690 inode->i_atime.tv_nsec,
691 atime->tv_sec, atime->tv_nsec);
692 inode->i_atime = *atime;
693 }
694 } else if (issued & CEPH_CAP_FILE_EXCL) {
695 /* we did a utimes(); ignore mds values */
696 } else {
697 warn = 1;
698 }
699 } else {
700 /* we have no write|excl caps; whatever the MDS says is true */
701 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
702 inode->i_ctime = *ctime;
703 inode->i_mtime = *mtime;
704 inode->i_atime = *atime;
705 ci->i_time_warp_seq = time_warp_seq;
706 } else {
707 warn = 1;
708 }
709 }
710 if (warn) /* time_warp_seq shouldn't go backwards */
711 dout("%p mds time_warp_seq %llu < %u\n",
712 inode, time_warp_seq, ci->i_time_warp_seq);
713 }
714
715 /*
716 * Populate an inode based on info from mds. May be called on new or
717 * existing inodes.
718 */
719 static int fill_inode(struct inode *inode, struct page *locked_page,
720 struct ceph_mds_reply_info_in *iinfo,
721 struct ceph_mds_reply_dirfrag *dirinfo,
722 struct ceph_mds_session *session,
723 unsigned long ttl_from, int cap_fmode,
724 struct ceph_cap_reservation *caps_reservation)
725 {
726 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
727 struct ceph_mds_reply_inode *info = iinfo->in;
728 struct ceph_inode_info *ci = ceph_inode(inode);
729 int issued = 0, implemented, new_issued;
730 struct timespec mtime, atime, ctime;
731 struct ceph_buffer *xattr_blob = NULL;
732 struct ceph_string *pool_ns = NULL;
733 struct ceph_cap *new_cap = NULL;
734 int err = 0;
735 bool wake = false;
736 bool queue_trunc = false;
737 bool new_version = false;
738 bool fill_inline = false;
739
740 dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
741 inode, ceph_vinop(inode), le64_to_cpu(info->version),
742 ci->i_version);
743
744 /* prealloc new cap struct */
745 if (info->cap.caps && ceph_snap(inode) == CEPH_NOSNAP)
746 new_cap = ceph_get_cap(mdsc, caps_reservation);
747
748 /*
749 * prealloc xattr data, if it looks like we'll need it. only
750 * if len > 4 (meaning there are actually xattrs; the first 4
751 * bytes are the xattr count).
752 */
753 if (iinfo->xattr_len > 4) {
754 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
755 if (!xattr_blob)
756 pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
757 iinfo->xattr_len);
758 }
759
760 if (iinfo->pool_ns_len > 0)
761 pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data,
762 iinfo->pool_ns_len);
763
764 spin_lock(&ci->i_ceph_lock);
765
766 /*
767 * provided version will be odd if inode value is projected,
768 * even if stable. skip the update if we have newer stable
769 * info (ours>=theirs, e.g. due to racing mds replies), unless
770 * we are getting projected (unstable) info (in which case the
771 * version is odd, and we want ours>theirs).
772 * us them
773 * 2 2 skip
774 * 3 2 skip
775 * 3 3 update
776 */
777 if (ci->i_version == 0 ||
778 ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
779 le64_to_cpu(info->version) > (ci->i_version & ~1)))
780 new_version = true;
781
782 issued = __ceph_caps_issued(ci, &implemented);
783 issued |= implemented | __ceph_caps_dirty(ci);
784 new_issued = ~issued & le32_to_cpu(info->cap.caps);
785
786 /* update inode */
787 ci->i_version = le64_to_cpu(info->version);
788 inode->i_version++;
789 inode->i_rdev = le32_to_cpu(info->rdev);
790 inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
791
792 if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
793 (issued & CEPH_CAP_AUTH_EXCL) == 0) {
794 inode->i_mode = le32_to_cpu(info->mode);
795 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
796 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
797 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
798 from_kuid(&init_user_ns, inode->i_uid),
799 from_kgid(&init_user_ns, inode->i_gid));
800 }
801
802 if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
803 (issued & CEPH_CAP_LINK_EXCL) == 0)
804 set_nlink(inode, le32_to_cpu(info->nlink));
805
806 if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
807 /* be careful with mtime, atime, size */
808 ceph_decode_timespec(&atime, &info->atime);
809 ceph_decode_timespec(&mtime, &info->mtime);
810 ceph_decode_timespec(&ctime, &info->ctime);
811 ceph_fill_file_time(inode, issued,
812 le32_to_cpu(info->time_warp_seq),
813 &ctime, &mtime, &atime);
814 }
815
816 if (new_version ||
817 (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
818 s64 old_pool = ci->i_layout.pool_id;
819 struct ceph_string *old_ns;
820
821 ceph_file_layout_from_legacy(&ci->i_layout, &info->layout);
822 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
823 lockdep_is_held(&ci->i_ceph_lock));
824 rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns);
825
826 if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns)
827 ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
828
829 pool_ns = old_ns;
830
831 queue_trunc = ceph_fill_file_size(inode, issued,
832 le32_to_cpu(info->truncate_seq),
833 le64_to_cpu(info->truncate_size),
834 le64_to_cpu(info->size));
835 /* only update max_size on auth cap */
836 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
837 ci->i_max_size != le64_to_cpu(info->max_size)) {
838 dout("max_size %lld -> %llu\n", ci->i_max_size,
839 le64_to_cpu(info->max_size));
840 ci->i_max_size = le64_to_cpu(info->max_size);
841 }
842 }
843
844 /* xattrs */
845 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
846 if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL)) &&
847 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
848 if (ci->i_xattrs.blob)
849 ceph_buffer_put(ci->i_xattrs.blob);
850 ci->i_xattrs.blob = xattr_blob;
851 if (xattr_blob)
852 memcpy(ci->i_xattrs.blob->vec.iov_base,
853 iinfo->xattr_data, iinfo->xattr_len);
854 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
855 ceph_forget_all_cached_acls(inode);
856 xattr_blob = NULL;
857 }
858
859 inode->i_mapping->a_ops = &ceph_aops;
860
861 switch (inode->i_mode & S_IFMT) {
862 case S_IFIFO:
863 case S_IFBLK:
864 case S_IFCHR:
865 case S_IFSOCK:
866 init_special_inode(inode, inode->i_mode, inode->i_rdev);
867 inode->i_op = &ceph_file_iops;
868 break;
869 case S_IFREG:
870 inode->i_op = &ceph_file_iops;
871 inode->i_fop = &ceph_file_fops;
872 break;
873 case S_IFLNK:
874 inode->i_op = &ceph_symlink_iops;
875 if (!ci->i_symlink) {
876 u32 symlen = iinfo->symlink_len;
877 char *sym;
878
879 spin_unlock(&ci->i_ceph_lock);
880
881 if (symlen != i_size_read(inode)) {
882 pr_err("fill_inode %llx.%llx BAD symlink "
883 "size %lld\n", ceph_vinop(inode),
884 i_size_read(inode));
885 i_size_write(inode, symlen);
886 inode->i_blocks = calc_inode_blocks(symlen);
887 }
888
889 err = -ENOMEM;
890 sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
891 if (!sym)
892 goto out;
893
894 spin_lock(&ci->i_ceph_lock);
895 if (!ci->i_symlink)
896 ci->i_symlink = sym;
897 else
898 kfree(sym); /* lost a race */
899 }
900 inode->i_link = ci->i_symlink;
901 break;
902 case S_IFDIR:
903 inode->i_op = &ceph_dir_iops;
904 inode->i_fop = &ceph_dir_fops;
905
906 ci->i_dir_layout = iinfo->dir_layout;
907
908 ci->i_files = le64_to_cpu(info->files);
909 ci->i_subdirs = le64_to_cpu(info->subdirs);
910 ci->i_rbytes = le64_to_cpu(info->rbytes);
911 ci->i_rfiles = le64_to_cpu(info->rfiles);
912 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
913 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
914 break;
915 default:
916 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
917 ceph_vinop(inode), inode->i_mode);
918 }
919
920 /* were we issued a capability? */
921 if (info->cap.caps) {
922 if (ceph_snap(inode) == CEPH_NOSNAP) {
923 unsigned caps = le32_to_cpu(info->cap.caps);
924 ceph_add_cap(inode, session,
925 le64_to_cpu(info->cap.cap_id),
926 cap_fmode, caps,
927 le32_to_cpu(info->cap.wanted),
928 le32_to_cpu(info->cap.seq),
929 le32_to_cpu(info->cap.mseq),
930 le64_to_cpu(info->cap.realm),
931 info->cap.flags, &new_cap);
932
933 /* set dir completion flag? */
934 if (S_ISDIR(inode->i_mode) &&
935 ci->i_files == 0 && ci->i_subdirs == 0 &&
936 (caps & CEPH_CAP_FILE_SHARED) &&
937 (issued & CEPH_CAP_FILE_EXCL) == 0 &&
938 !__ceph_dir_is_complete(ci)) {
939 dout(" marking %p complete (empty)\n", inode);
940 i_size_write(inode, 0);
941 __ceph_dir_set_complete(ci,
942 atomic64_read(&ci->i_release_count),
943 atomic64_read(&ci->i_ordered_count));
944 }
945
946 wake = true;
947 } else {
948 dout(" %p got snap_caps %s\n", inode,
949 ceph_cap_string(le32_to_cpu(info->cap.caps)));
950 ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
951 if (cap_fmode >= 0)
952 __ceph_get_fmode(ci, cap_fmode);
953 }
954 } else if (cap_fmode >= 0) {
955 pr_warn("mds issued no caps on %llx.%llx\n",
956 ceph_vinop(inode));
957 __ceph_get_fmode(ci, cap_fmode);
958 }
959
960 if (iinfo->inline_version > 0 &&
961 iinfo->inline_version >= ci->i_inline_version) {
962 int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
963 ci->i_inline_version = iinfo->inline_version;
964 if (ci->i_inline_version != CEPH_INLINE_NONE &&
965 (locked_page ||
966 (le32_to_cpu(info->cap.caps) & cache_caps)))
967 fill_inline = true;
968 }
969
970 spin_unlock(&ci->i_ceph_lock);
971
972 if (fill_inline)
973 ceph_fill_inline_data(inode, locked_page,
974 iinfo->inline_data, iinfo->inline_len);
975
976 if (wake)
977 wake_up_all(&ci->i_cap_wq);
978
979 /* queue truncate if we saw i_size decrease */
980 if (queue_trunc)
981 ceph_queue_vmtruncate(inode);
982
983 /* populate frag tree */
984 if (S_ISDIR(inode->i_mode))
985 ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
986
987 /* update delegation info? */
988 if (dirinfo)
989 ceph_fill_dirfrag(inode, dirinfo);
990
991 err = 0;
992 out:
993 if (new_cap)
994 ceph_put_cap(mdsc, new_cap);
995 if (xattr_blob)
996 ceph_buffer_put(xattr_blob);
997 ceph_put_string(pool_ns);
998 return err;
999 }
1000
1001 /*
1002 * caller should hold session s_mutex.
1003 */
1004 static void update_dentry_lease(struct dentry *dentry,
1005 struct ceph_mds_reply_lease *lease,
1006 struct ceph_mds_session *session,
1007 unsigned long from_time,
1008 struct ceph_vino *tgt_vino,
1009 struct ceph_vino *dir_vino)
1010 {
1011 struct ceph_dentry_info *di = ceph_dentry(dentry);
1012 long unsigned duration = le32_to_cpu(lease->duration_ms);
1013 long unsigned ttl = from_time + (duration * HZ) / 1000;
1014 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
1015 struct inode *dir;
1016 struct ceph_mds_session *old_lease_session = NULL;
1017
1018 /*
1019 * Make sure dentry's inode matches tgt_vino. NULL tgt_vino means that
1020 * we expect a negative dentry.
1021 */
1022 if (!tgt_vino && d_really_is_positive(dentry))
1023 return;
1024
1025 if (tgt_vino && (d_really_is_negative(dentry) ||
1026 !ceph_ino_compare(d_inode(dentry), tgt_vino)))
1027 return;
1028
1029 spin_lock(&dentry->d_lock);
1030 dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
1031 dentry, duration, ttl);
1032
1033 dir = d_inode(dentry->d_parent);
1034
1035 /* make sure parent matches dir_vino */
1036 if (!ceph_ino_compare(dir, dir_vino))
1037 goto out_unlock;
1038
1039 /* only track leases on regular dentries */
1040 if (ceph_snap(dir) != CEPH_NOSNAP)
1041 goto out_unlock;
1042
1043 di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
1044
1045 if (duration == 0)
1046 goto out_unlock;
1047
1048 if (di->lease_gen == session->s_cap_gen &&
1049 time_before(ttl, di->time))
1050 goto out_unlock; /* we already have a newer lease. */
1051
1052 if (di->lease_session && di->lease_session != session) {
1053 old_lease_session = di->lease_session;
1054 di->lease_session = NULL;
1055 }
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 if (old_lease_session)
1069 ceph_put_mds_session(old_lease_session);
1070 }
1071
1072 /*
1073 * splice a dentry to an inode.
1074 * caller must hold directory i_mutex for this to be safe.
1075 */
1076 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in)
1077 {
1078 struct dentry *realdn;
1079
1080 BUG_ON(d_inode(dn));
1081
1082 /* dn must be unhashed */
1083 if (!d_unhashed(dn))
1084 d_drop(dn);
1085 realdn = d_splice_alias(in, dn);
1086 if (IS_ERR(realdn)) {
1087 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
1088 PTR_ERR(realdn), dn, in, ceph_vinop(in));
1089 dn = realdn; /* note realdn contains the error */
1090 goto out;
1091 } else if (realdn) {
1092 dout("dn %p (%d) spliced with %p (%d) "
1093 "inode %p ino %llx.%llx\n",
1094 dn, d_count(dn),
1095 realdn, d_count(realdn),
1096 d_inode(realdn), ceph_vinop(d_inode(realdn)));
1097 dput(dn);
1098 dn = realdn;
1099 } else {
1100 BUG_ON(!ceph_dentry(dn));
1101 dout("dn %p attached to %p ino %llx.%llx\n",
1102 dn, d_inode(dn), ceph_vinop(d_inode(dn)));
1103 }
1104 out:
1105 return dn;
1106 }
1107
1108 /*
1109 * Incorporate results into the local cache. This is either just
1110 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1111 * after a lookup).
1112 *
1113 * A reply may contain
1114 * a directory inode along with a dentry.
1115 * and/or a target inode
1116 *
1117 * Called with snap_rwsem (read).
1118 */
1119 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
1120 {
1121 struct ceph_mds_session *session = req->r_session;
1122 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1123 struct inode *in = NULL;
1124 struct ceph_vino tvino, dvino;
1125 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1126 int err = 0;
1127
1128 dout("fill_trace %p is_dentry %d is_target %d\n", req,
1129 rinfo->head->is_dentry, rinfo->head->is_target);
1130
1131 if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1132 dout("fill_trace reply is empty!\n");
1133 if (rinfo->head->result == 0 && req->r_parent)
1134 ceph_invalidate_dir_request(req);
1135 return 0;
1136 }
1137
1138 if (rinfo->head->is_dentry) {
1139 struct inode *dir = req->r_parent;
1140
1141 if (dir) {
1142 err = fill_inode(dir, NULL,
1143 &rinfo->diri, rinfo->dirfrag,
1144 session, req->r_request_started, -1,
1145 &req->r_caps_reservation);
1146 if (err < 0)
1147 goto done;
1148 } else {
1149 WARN_ON_ONCE(1);
1150 }
1151
1152 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME) {
1153 struct qstr dname;
1154 struct dentry *dn, *parent;
1155
1156 BUG_ON(!rinfo->head->is_target);
1157 BUG_ON(req->r_dentry);
1158
1159 parent = d_find_any_alias(dir);
1160 BUG_ON(!parent);
1161
1162 dname.name = rinfo->dname;
1163 dname.len = rinfo->dname_len;
1164 dname.hash = full_name_hash(parent, dname.name, dname.len);
1165 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1166 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1167 retry_lookup:
1168 dn = d_lookup(parent, &dname);
1169 dout("d_lookup on parent=%p name=%.*s got %p\n",
1170 parent, dname.len, dname.name, dn);
1171
1172 if (!dn) {
1173 dn = d_alloc(parent, &dname);
1174 dout("d_alloc %p '%.*s' = %p\n", parent,
1175 dname.len, dname.name, dn);
1176 if (!dn) {
1177 dput(parent);
1178 err = -ENOMEM;
1179 goto done;
1180 }
1181 err = 0;
1182 } else if (d_really_is_positive(dn) &&
1183 (ceph_ino(d_inode(dn)) != tvino.ino ||
1184 ceph_snap(d_inode(dn)) != tvino.snap)) {
1185 dout(" dn %p points to wrong inode %p\n",
1186 dn, d_inode(dn));
1187 d_delete(dn);
1188 dput(dn);
1189 goto retry_lookup;
1190 }
1191
1192 req->r_dentry = dn;
1193 dput(parent);
1194 }
1195 }
1196
1197 if (rinfo->head->is_target) {
1198 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1199 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1200
1201 in = ceph_get_inode(sb, tvino);
1202 if (IS_ERR(in)) {
1203 err = PTR_ERR(in);
1204 goto done;
1205 }
1206 req->r_target_inode = in;
1207
1208 err = fill_inode(in, req->r_locked_page, &rinfo->targeti, NULL,
1209 session, req->r_request_started,
1210 (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1211 rinfo->head->result == 0) ? req->r_fmode : -1,
1212 &req->r_caps_reservation);
1213 if (err < 0) {
1214 pr_err("fill_inode badness %p %llx.%llx\n",
1215 in, ceph_vinop(in));
1216 goto done;
1217 }
1218 }
1219
1220 /*
1221 * ignore null lease/binding on snapdir ENOENT, or else we
1222 * will have trouble splicing in the virtual snapdir later
1223 */
1224 if (rinfo->head->is_dentry &&
1225 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1226 test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1227 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1228 fsc->mount_options->snapdir_name,
1229 req->r_dentry->d_name.len))) {
1230 /*
1231 * lookup link rename : null -> possibly existing inode
1232 * mknod symlink mkdir : null -> new inode
1233 * unlink : linked -> null
1234 */
1235 struct inode *dir = req->r_parent;
1236 struct dentry *dn = req->r_dentry;
1237 bool have_dir_cap, have_lease;
1238
1239 BUG_ON(!dn);
1240 BUG_ON(!dir);
1241 BUG_ON(d_inode(dn->d_parent) != dir);
1242
1243 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1244 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1245
1246 BUG_ON(ceph_ino(dir) != dvino.ino);
1247 BUG_ON(ceph_snap(dir) != dvino.snap);
1248
1249 /* do we have a lease on the whole dir? */
1250 have_dir_cap =
1251 (le32_to_cpu(rinfo->diri.in->cap.caps) &
1252 CEPH_CAP_FILE_SHARED);
1253
1254 /* do we have a dn lease? */
1255 have_lease = have_dir_cap ||
1256 le32_to_cpu(rinfo->dlease->duration_ms);
1257 if (!have_lease)
1258 dout("fill_trace no dentry lease or dir cap\n");
1259
1260 /* rename? */
1261 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1262 struct inode *olddir = req->r_old_dentry_dir;
1263 BUG_ON(!olddir);
1264
1265 dout(" src %p '%pd' dst %p '%pd'\n",
1266 req->r_old_dentry,
1267 req->r_old_dentry,
1268 dn, dn);
1269 dout("fill_trace doing d_move %p -> %p\n",
1270 req->r_old_dentry, dn);
1271
1272 /* d_move screws up sibling dentries' offsets */
1273 ceph_dir_clear_ordered(dir);
1274 ceph_dir_clear_ordered(olddir);
1275
1276 d_move(req->r_old_dentry, dn);
1277 dout(" src %p '%pd' dst %p '%pd'\n",
1278 req->r_old_dentry,
1279 req->r_old_dentry,
1280 dn, dn);
1281
1282 /* ensure target dentry is invalidated, despite
1283 rehashing bug in vfs_rename_dir */
1284 ceph_invalidate_dentry_lease(dn);
1285
1286 dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1287 ceph_dentry(req->r_old_dentry)->offset);
1288
1289 dn = req->r_old_dentry; /* use old_dentry */
1290 }
1291
1292 /* null dentry? */
1293 if (!rinfo->head->is_target) {
1294 dout("fill_trace null dentry\n");
1295 if (d_really_is_positive(dn)) {
1296 ceph_dir_clear_ordered(dir);
1297 dout("d_delete %p\n", dn);
1298 d_delete(dn);
1299 } else if (have_lease) {
1300 if (d_unhashed(dn))
1301 d_add(dn, NULL);
1302 update_dentry_lease(dn, rinfo->dlease,
1303 session,
1304 req->r_request_started,
1305 NULL, &dvino);
1306 }
1307 goto done;
1308 }
1309
1310 /* attach proper inode */
1311 if (d_really_is_negative(dn)) {
1312 ceph_dir_clear_ordered(dir);
1313 ihold(in);
1314 dn = splice_dentry(dn, in);
1315 if (IS_ERR(dn)) {
1316 err = PTR_ERR(dn);
1317 goto done;
1318 }
1319 req->r_dentry = dn; /* may have spliced */
1320 } else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1321 dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1322 dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1323 ceph_vinop(in));
1324 d_invalidate(dn);
1325 have_lease = false;
1326 }
1327
1328 if (have_lease) {
1329 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1330 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1331 update_dentry_lease(dn, rinfo->dlease, session,
1332 req->r_request_started,
1333 &tvino, &dvino);
1334 }
1335 dout(" final dn %p\n", dn);
1336 } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1337 req->r_op == CEPH_MDS_OP_MKSNAP) &&
1338 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1339 struct dentry *dn = req->r_dentry;
1340 struct inode *dir = req->r_parent;
1341
1342 /* fill out a snapdir LOOKUPSNAP dentry */
1343 BUG_ON(!dn);
1344 BUG_ON(!dir);
1345 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1346 dout(" linking snapped dir %p to dn %p\n", in, dn);
1347 ceph_dir_clear_ordered(dir);
1348 ihold(in);
1349 dn = splice_dentry(dn, in);
1350 if (IS_ERR(dn)) {
1351 err = PTR_ERR(dn);
1352 goto done;
1353 }
1354 req->r_dentry = dn; /* may have spliced */
1355 } else if (rinfo->head->is_dentry) {
1356 struct ceph_vino *ptvino = NULL;
1357
1358 if ((le32_to_cpu(rinfo->diri.in->cap.caps) & CEPH_CAP_FILE_SHARED) ||
1359 le32_to_cpu(rinfo->dlease->duration_ms)) {
1360 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1361 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1362
1363 if (rinfo->head->is_target) {
1364 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1365 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1366 ptvino = &tvino;
1367 }
1368
1369 update_dentry_lease(req->r_dentry, rinfo->dlease,
1370 session, req->r_request_started, ptvino,
1371 &dvino);
1372 } else {
1373 dout("%s: no dentry lease or dir cap\n", __func__);
1374 }
1375 }
1376 done:
1377 dout("fill_trace done err=%d\n", err);
1378 return err;
1379 }
1380
1381 /*
1382 * Prepopulate our cache with readdir results, leases, etc.
1383 */
1384 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1385 struct ceph_mds_session *session)
1386 {
1387 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1388 int i, err = 0;
1389
1390 for (i = 0; i < rinfo->dir_nr; i++) {
1391 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1392 struct ceph_vino vino;
1393 struct inode *in;
1394 int rc;
1395
1396 vino.ino = le64_to_cpu(rde->inode.in->ino);
1397 vino.snap = le64_to_cpu(rde->inode.in->snapid);
1398
1399 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1400 if (IS_ERR(in)) {
1401 err = PTR_ERR(in);
1402 dout("new_inode badness got %d\n", err);
1403 continue;
1404 }
1405 rc = fill_inode(in, NULL, &rde->inode, NULL, session,
1406 req->r_request_started, -1,
1407 &req->r_caps_reservation);
1408 if (rc < 0) {
1409 pr_err("fill_inode badness on %p got %d\n", in, rc);
1410 err = rc;
1411 }
1412 iput(in);
1413 }
1414
1415 return err;
1416 }
1417
1418 void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1419 {
1420 if (ctl->page) {
1421 kunmap(ctl->page);
1422 put_page(ctl->page);
1423 ctl->page = NULL;
1424 }
1425 }
1426
1427 static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1428 struct ceph_readdir_cache_control *ctl,
1429 struct ceph_mds_request *req)
1430 {
1431 struct ceph_inode_info *ci = ceph_inode(dir);
1432 unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
1433 unsigned idx = ctl->index % nsize;
1434 pgoff_t pgoff = ctl->index / nsize;
1435
1436 if (!ctl->page || pgoff != page_index(ctl->page)) {
1437 ceph_readdir_cache_release(ctl);
1438 if (idx == 0)
1439 ctl->page = grab_cache_page(&dir->i_data, pgoff);
1440 else
1441 ctl->page = find_lock_page(&dir->i_data, pgoff);
1442 if (!ctl->page) {
1443 ctl->index = -1;
1444 return idx == 0 ? -ENOMEM : 0;
1445 }
1446 /* reading/filling the cache are serialized by
1447 * i_mutex, no need to use page lock */
1448 unlock_page(ctl->page);
1449 ctl->dentries = kmap(ctl->page);
1450 if (idx == 0)
1451 memset(ctl->dentries, 0, PAGE_SIZE);
1452 }
1453
1454 if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1455 req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1456 dout("readdir cache dn %p idx %d\n", dn, ctl->index);
1457 ctl->dentries[idx] = dn;
1458 ctl->index++;
1459 } else {
1460 dout("disable readdir cache\n");
1461 ctl->index = -1;
1462 }
1463 return 0;
1464 }
1465
1466 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1467 struct ceph_mds_session *session)
1468 {
1469 struct dentry *parent = req->r_dentry;
1470 struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
1471 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1472 struct qstr dname;
1473 struct dentry *dn;
1474 struct inode *in;
1475 int err = 0, skipped = 0, ret, i;
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 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1509 rinfo->dir_nr, parent);
1510 } else {
1511 dout("readdir_prepopulate %d items under dn %p\n",
1512 rinfo->dir_nr, parent);
1513 if (rinfo->dir_dir)
1514 ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1515
1516 if (ceph_frag_is_leftmost(frag) &&
1517 req->r_readdir_offset == 2 &&
1518 !(rinfo->hash_order && last_hash)) {
1519 /* note dir version at start of readdir so we can
1520 * tell if any dentries get dropped */
1521 req->r_dir_release_cnt =
1522 atomic64_read(&ci->i_release_count);
1523 req->r_dir_ordered_cnt =
1524 atomic64_read(&ci->i_ordered_count);
1525 req->r_readdir_cache_idx = 0;
1526 }
1527 }
1528
1529 cache_ctl.index = req->r_readdir_cache_idx;
1530 fpos_offset = req->r_readdir_offset;
1531
1532 /* FIXME: release caps/leases if error occurs */
1533 for (i = 0; i < rinfo->dir_nr; i++) {
1534 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1535 struct ceph_vino tvino, dvino;
1536
1537 dname.name = rde->name;
1538 dname.len = rde->name_len;
1539 dname.hash = full_name_hash(parent, dname.name, dname.len);
1540
1541 tvino.ino = le64_to_cpu(rde->inode.in->ino);
1542 tvino.snap = le64_to_cpu(rde->inode.in->snapid);
1543
1544 if (rinfo->hash_order) {
1545 u32 hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1546 rde->name, rde->name_len);
1547 hash = ceph_frag_value(hash);
1548 if (hash != last_hash)
1549 fpos_offset = 2;
1550 last_hash = hash;
1551 rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
1552 } else {
1553 rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
1554 }
1555
1556 retry_lookup:
1557 dn = d_lookup(parent, &dname);
1558 dout("d_lookup on parent=%p name=%.*s got %p\n",
1559 parent, dname.len, dname.name, dn);
1560
1561 if (!dn) {
1562 dn = d_alloc(parent, &dname);
1563 dout("d_alloc %p '%.*s' = %p\n", parent,
1564 dname.len, dname.name, dn);
1565 if (!dn) {
1566 dout("d_alloc badness\n");
1567 err = -ENOMEM;
1568 goto out;
1569 }
1570 } else if (d_really_is_positive(dn) &&
1571 (ceph_ino(d_inode(dn)) != tvino.ino ||
1572 ceph_snap(d_inode(dn)) != tvino.snap)) {
1573 dout(" dn %p points to wrong inode %p\n",
1574 dn, d_inode(dn));
1575 d_delete(dn);
1576 dput(dn);
1577 goto retry_lookup;
1578 }
1579
1580 /* inode */
1581 if (d_really_is_positive(dn)) {
1582 in = d_inode(dn);
1583 } else {
1584 in = ceph_get_inode(parent->d_sb, tvino);
1585 if (IS_ERR(in)) {
1586 dout("new_inode badness\n");
1587 d_drop(dn);
1588 dput(dn);
1589 err = PTR_ERR(in);
1590 goto out;
1591 }
1592 }
1593
1594 ret = fill_inode(in, NULL, &rde->inode, NULL, session,
1595 req->r_request_started, -1,
1596 &req->r_caps_reservation);
1597 if (ret < 0) {
1598 pr_err("fill_inode badness on %p\n", in);
1599 if (d_really_is_negative(dn))
1600 iput(in);
1601 d_drop(dn);
1602 err = ret;
1603 goto next_item;
1604 }
1605
1606 if (d_really_is_negative(dn)) {
1607 struct dentry *realdn;
1608
1609 if (ceph_security_xattr_deadlock(in)) {
1610 dout(" skip splicing dn %p to inode %p"
1611 " (security xattr deadlock)\n", dn, in);
1612 iput(in);
1613 skipped++;
1614 goto next_item;
1615 }
1616
1617 realdn = splice_dentry(dn, in);
1618 if (IS_ERR(realdn)) {
1619 err = PTR_ERR(realdn);
1620 d_drop(dn);
1621 dn = NULL;
1622 goto next_item;
1623 }
1624 dn = realdn;
1625 }
1626
1627 ceph_dentry(dn)->offset = rde->offset;
1628
1629 dvino = ceph_vino(d_inode(parent));
1630 update_dentry_lease(dn, rde->lease, req->r_session,
1631 req->r_request_started, &tvino, &dvino);
1632
1633 if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
1634 ret = fill_readdir_cache(d_inode(parent), dn,
1635 &cache_ctl, req);
1636 if (ret < 0)
1637 err = ret;
1638 }
1639 next_item:
1640 if (dn)
1641 dput(dn);
1642 }
1643 out:
1644 if (err == 0 && skipped == 0) {
1645 set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
1646 req->r_readdir_cache_idx = cache_ctl.index;
1647 }
1648 ceph_readdir_cache_release(&cache_ctl);
1649 dout("readdir_prepopulate done\n");
1650 return err;
1651 }
1652
1653 bool ceph_inode_set_size(struct inode *inode, loff_t size)
1654 {
1655 struct ceph_inode_info *ci = ceph_inode(inode);
1656 bool ret;
1657
1658 spin_lock(&ci->i_ceph_lock);
1659 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1660 i_size_write(inode, size);
1661 inode->i_blocks = calc_inode_blocks(size);
1662
1663 ret = __ceph_should_report_size(ci);
1664
1665 spin_unlock(&ci->i_ceph_lock);
1666 return ret;
1667 }
1668
1669 /*
1670 * Write back inode data in a worker thread. (This can't be done
1671 * in the message handler context.)
1672 */
1673 void ceph_queue_writeback(struct inode *inode)
1674 {
1675 ihold(inode);
1676 if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1677 &ceph_inode(inode)->i_wb_work)) {
1678 dout("ceph_queue_writeback %p\n", inode);
1679 } else {
1680 dout("ceph_queue_writeback %p failed\n", inode);
1681 iput(inode);
1682 }
1683 }
1684
1685 static void ceph_writeback_work(struct work_struct *work)
1686 {
1687 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1688 i_wb_work);
1689 struct inode *inode = &ci->vfs_inode;
1690
1691 dout("writeback %p\n", inode);
1692 filemap_fdatawrite(&inode->i_data);
1693 iput(inode);
1694 }
1695
1696 /*
1697 * queue an async invalidation
1698 */
1699 void ceph_queue_invalidate(struct inode *inode)
1700 {
1701 ihold(inode);
1702 if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1703 &ceph_inode(inode)->i_pg_inv_work)) {
1704 dout("ceph_queue_invalidate %p\n", inode);
1705 } else {
1706 dout("ceph_queue_invalidate %p failed\n", inode);
1707 iput(inode);
1708 }
1709 }
1710
1711 /*
1712 * Invalidate inode pages in a worker thread. (This can't be done
1713 * in the message handler context.)
1714 */
1715 static void ceph_invalidate_work(struct work_struct *work)
1716 {
1717 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1718 i_pg_inv_work);
1719 struct inode *inode = &ci->vfs_inode;
1720 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1721 u32 orig_gen;
1722 int check = 0;
1723
1724 mutex_lock(&ci->i_truncate_mutex);
1725
1726 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
1727 pr_warn_ratelimited("invalidate_pages %p %lld forced umount\n",
1728 inode, ceph_ino(inode));
1729 mapping_set_error(inode->i_mapping, -EIO);
1730 truncate_pagecache(inode, 0);
1731 mutex_unlock(&ci->i_truncate_mutex);
1732 goto out;
1733 }
1734
1735 spin_lock(&ci->i_ceph_lock);
1736 dout("invalidate_pages %p gen %d revoking %d\n", inode,
1737 ci->i_rdcache_gen, ci->i_rdcache_revoking);
1738 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1739 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1740 check = 1;
1741 spin_unlock(&ci->i_ceph_lock);
1742 mutex_unlock(&ci->i_truncate_mutex);
1743 goto out;
1744 }
1745 orig_gen = ci->i_rdcache_gen;
1746 spin_unlock(&ci->i_ceph_lock);
1747
1748 if (invalidate_inode_pages2(inode->i_mapping) < 0) {
1749 pr_err("invalidate_pages %p fails\n", inode);
1750 }
1751
1752 spin_lock(&ci->i_ceph_lock);
1753 if (orig_gen == ci->i_rdcache_gen &&
1754 orig_gen == ci->i_rdcache_revoking) {
1755 dout("invalidate_pages %p gen %d successful\n", inode,
1756 ci->i_rdcache_gen);
1757 ci->i_rdcache_revoking--;
1758 check = 1;
1759 } else {
1760 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1761 inode, orig_gen, ci->i_rdcache_gen,
1762 ci->i_rdcache_revoking);
1763 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1764 check = 1;
1765 }
1766 spin_unlock(&ci->i_ceph_lock);
1767 mutex_unlock(&ci->i_truncate_mutex);
1768 out:
1769 if (check)
1770 ceph_check_caps(ci, 0, NULL);
1771 iput(inode);
1772 }
1773
1774
1775 /*
1776 * called by trunc_wq;
1777 *
1778 * We also truncate in a separate thread as well.
1779 */
1780 static void ceph_vmtruncate_work(struct work_struct *work)
1781 {
1782 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1783 i_vmtruncate_work);
1784 struct inode *inode = &ci->vfs_inode;
1785
1786 dout("vmtruncate_work %p\n", inode);
1787 __ceph_do_pending_vmtruncate(inode);
1788 iput(inode);
1789 }
1790
1791 /*
1792 * Queue an async vmtruncate. If we fail to queue work, we will handle
1793 * the truncation the next time we call __ceph_do_pending_vmtruncate.
1794 */
1795 void ceph_queue_vmtruncate(struct inode *inode)
1796 {
1797 struct ceph_inode_info *ci = ceph_inode(inode);
1798
1799 ihold(inode);
1800
1801 if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1802 &ci->i_vmtruncate_work)) {
1803 dout("ceph_queue_vmtruncate %p\n", inode);
1804 } else {
1805 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1806 inode, ci->i_truncate_pending);
1807 iput(inode);
1808 }
1809 }
1810
1811 /*
1812 * Make sure any pending truncation is applied before doing anything
1813 * that may depend on it.
1814 */
1815 void __ceph_do_pending_vmtruncate(struct inode *inode)
1816 {
1817 struct ceph_inode_info *ci = ceph_inode(inode);
1818 u64 to;
1819 int wrbuffer_refs, finish = 0;
1820
1821 mutex_lock(&ci->i_truncate_mutex);
1822 retry:
1823 spin_lock(&ci->i_ceph_lock);
1824 if (ci->i_truncate_pending == 0) {
1825 dout("__do_pending_vmtruncate %p none pending\n", inode);
1826 spin_unlock(&ci->i_ceph_lock);
1827 mutex_unlock(&ci->i_truncate_mutex);
1828 return;
1829 }
1830
1831 /*
1832 * make sure any dirty snapped pages are flushed before we
1833 * possibly truncate them.. so write AND block!
1834 */
1835 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1836 struct ceph_cap_snap *capsnap;
1837 to = ci->i_truncate_size;
1838 list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) {
1839 // MDS should have revoked Frw caps
1840 WARN_ON_ONCE(capsnap->writing);
1841 if (capsnap->dirty_pages && capsnap->size > to)
1842 to = capsnap->size;
1843 }
1844 spin_unlock(&ci->i_ceph_lock);
1845 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1846 inode);
1847
1848 truncate_pagecache(inode, to);
1849
1850 filemap_write_and_wait_range(&inode->i_data, 0,
1851 inode->i_sb->s_maxbytes);
1852 goto retry;
1853 }
1854
1855 /* there should be no reader or writer */
1856 WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1857
1858 to = ci->i_truncate_size;
1859 wrbuffer_refs = ci->i_wrbuffer_ref;
1860 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1861 ci->i_truncate_pending, to);
1862 spin_unlock(&ci->i_ceph_lock);
1863
1864 truncate_pagecache(inode, to);
1865
1866 spin_lock(&ci->i_ceph_lock);
1867 if (to == ci->i_truncate_size) {
1868 ci->i_truncate_pending = 0;
1869 finish = 1;
1870 }
1871 spin_unlock(&ci->i_ceph_lock);
1872 if (!finish)
1873 goto retry;
1874
1875 mutex_unlock(&ci->i_truncate_mutex);
1876
1877 if (wrbuffer_refs == 0)
1878 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1879
1880 wake_up_all(&ci->i_cap_wq);
1881 }
1882
1883 /*
1884 * symlinks
1885 */
1886 static const struct inode_operations ceph_symlink_iops = {
1887 .get_link = simple_get_link,
1888 .setattr = ceph_setattr,
1889 .getattr = ceph_getattr,
1890 .listxattr = ceph_listxattr,
1891 };
1892
1893 int __ceph_setattr(struct inode *inode, struct iattr *attr)
1894 {
1895 struct ceph_inode_info *ci = ceph_inode(inode);
1896 const unsigned int ia_valid = attr->ia_valid;
1897 struct ceph_mds_request *req;
1898 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1899 struct ceph_cap_flush *prealloc_cf;
1900 int issued;
1901 int release = 0, dirtied = 0;
1902 int mask = 0;
1903 int err = 0;
1904 int inode_dirty_flags = 0;
1905 bool lock_snap_rwsem = false;
1906
1907 prealloc_cf = ceph_alloc_cap_flush();
1908 if (!prealloc_cf)
1909 return -ENOMEM;
1910
1911 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1912 USE_AUTH_MDS);
1913 if (IS_ERR(req)) {
1914 ceph_free_cap_flush(prealloc_cf);
1915 return PTR_ERR(req);
1916 }
1917
1918 spin_lock(&ci->i_ceph_lock);
1919 issued = __ceph_caps_issued(ci, NULL);
1920
1921 if (!ci->i_head_snapc &&
1922 (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
1923 lock_snap_rwsem = true;
1924 if (!down_read_trylock(&mdsc->snap_rwsem)) {
1925 spin_unlock(&ci->i_ceph_lock);
1926 down_read(&mdsc->snap_rwsem);
1927 spin_lock(&ci->i_ceph_lock);
1928 issued = __ceph_caps_issued(ci, NULL);
1929 }
1930 }
1931
1932 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1933
1934 if (ia_valid & ATTR_UID) {
1935 dout("setattr %p uid %d -> %d\n", inode,
1936 from_kuid(&init_user_ns, inode->i_uid),
1937 from_kuid(&init_user_ns, attr->ia_uid));
1938 if (issued & CEPH_CAP_AUTH_EXCL) {
1939 inode->i_uid = attr->ia_uid;
1940 dirtied |= CEPH_CAP_AUTH_EXCL;
1941 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1942 !uid_eq(attr->ia_uid, inode->i_uid)) {
1943 req->r_args.setattr.uid = cpu_to_le32(
1944 from_kuid(&init_user_ns, attr->ia_uid));
1945 mask |= CEPH_SETATTR_UID;
1946 release |= CEPH_CAP_AUTH_SHARED;
1947 }
1948 }
1949 if (ia_valid & ATTR_GID) {
1950 dout("setattr %p gid %d -> %d\n", inode,
1951 from_kgid(&init_user_ns, inode->i_gid),
1952 from_kgid(&init_user_ns, attr->ia_gid));
1953 if (issued & CEPH_CAP_AUTH_EXCL) {
1954 inode->i_gid = attr->ia_gid;
1955 dirtied |= CEPH_CAP_AUTH_EXCL;
1956 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1957 !gid_eq(attr->ia_gid, inode->i_gid)) {
1958 req->r_args.setattr.gid = cpu_to_le32(
1959 from_kgid(&init_user_ns, attr->ia_gid));
1960 mask |= CEPH_SETATTR_GID;
1961 release |= CEPH_CAP_AUTH_SHARED;
1962 }
1963 }
1964 if (ia_valid & ATTR_MODE) {
1965 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1966 attr->ia_mode);
1967 if (issued & CEPH_CAP_AUTH_EXCL) {
1968 inode->i_mode = attr->ia_mode;
1969 dirtied |= CEPH_CAP_AUTH_EXCL;
1970 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1971 attr->ia_mode != inode->i_mode) {
1972 inode->i_mode = attr->ia_mode;
1973 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1974 mask |= CEPH_SETATTR_MODE;
1975 release |= CEPH_CAP_AUTH_SHARED;
1976 }
1977 }
1978
1979 if (ia_valid & ATTR_ATIME) {
1980 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1981 inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1982 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1983 if (issued & CEPH_CAP_FILE_EXCL) {
1984 ci->i_time_warp_seq++;
1985 inode->i_atime = attr->ia_atime;
1986 dirtied |= CEPH_CAP_FILE_EXCL;
1987 } else if ((issued & CEPH_CAP_FILE_WR) &&
1988 timespec_compare(&inode->i_atime,
1989 &attr->ia_atime) < 0) {
1990 inode->i_atime = attr->ia_atime;
1991 dirtied |= CEPH_CAP_FILE_WR;
1992 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1993 !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1994 ceph_encode_timespec(&req->r_args.setattr.atime,
1995 &attr->ia_atime);
1996 mask |= CEPH_SETATTR_ATIME;
1997 release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1998 CEPH_CAP_FILE_WR;
1999 }
2000 }
2001 if (ia_valid & ATTR_MTIME) {
2002 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
2003 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
2004 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
2005 if (issued & CEPH_CAP_FILE_EXCL) {
2006 ci->i_time_warp_seq++;
2007 inode->i_mtime = attr->ia_mtime;
2008 dirtied |= CEPH_CAP_FILE_EXCL;
2009 } else if ((issued & CEPH_CAP_FILE_WR) &&
2010 timespec_compare(&inode->i_mtime,
2011 &attr->ia_mtime) < 0) {
2012 inode->i_mtime = attr->ia_mtime;
2013 dirtied |= CEPH_CAP_FILE_WR;
2014 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2015 !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
2016 ceph_encode_timespec(&req->r_args.setattr.mtime,
2017 &attr->ia_mtime);
2018 mask |= CEPH_SETATTR_MTIME;
2019 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
2020 CEPH_CAP_FILE_WR;
2021 }
2022 }
2023 if (ia_valid & ATTR_SIZE) {
2024 dout("setattr %p size %lld -> %lld\n", inode,
2025 inode->i_size, attr->ia_size);
2026 if ((issued & CEPH_CAP_FILE_EXCL) &&
2027 attr->ia_size > inode->i_size) {
2028 i_size_write(inode, attr->ia_size);
2029 inode->i_blocks = calc_inode_blocks(attr->ia_size);
2030 ci->i_reported_size = attr->ia_size;
2031 dirtied |= CEPH_CAP_FILE_EXCL;
2032 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2033 attr->ia_size != inode->i_size) {
2034 req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
2035 req->r_args.setattr.old_size =
2036 cpu_to_le64(inode->i_size);
2037 mask |= CEPH_SETATTR_SIZE;
2038 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
2039 CEPH_CAP_FILE_WR;
2040 }
2041 }
2042
2043 /* these do nothing */
2044 if (ia_valid & ATTR_CTIME) {
2045 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
2046 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
2047 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
2048 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
2049 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
2050 only ? "ctime only" : "ignored");
2051 if (only) {
2052 /*
2053 * if kernel wants to dirty ctime but nothing else,
2054 * we need to choose a cap to dirty under, or do
2055 * a almost-no-op setattr
2056 */
2057 if (issued & CEPH_CAP_AUTH_EXCL)
2058 dirtied |= CEPH_CAP_AUTH_EXCL;
2059 else if (issued & CEPH_CAP_FILE_EXCL)
2060 dirtied |= CEPH_CAP_FILE_EXCL;
2061 else if (issued & CEPH_CAP_XATTR_EXCL)
2062 dirtied |= CEPH_CAP_XATTR_EXCL;
2063 else
2064 mask |= CEPH_SETATTR_CTIME;
2065 }
2066 }
2067 if (ia_valid & ATTR_FILE)
2068 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
2069
2070 if (dirtied) {
2071 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
2072 &prealloc_cf);
2073 inode->i_ctime = attr->ia_ctime;
2074 }
2075
2076 release &= issued;
2077 spin_unlock(&ci->i_ceph_lock);
2078 if (lock_snap_rwsem)
2079 up_read(&mdsc->snap_rwsem);
2080
2081 if (inode_dirty_flags)
2082 __mark_inode_dirty(inode, inode_dirty_flags);
2083
2084
2085 if (mask) {
2086 req->r_inode = inode;
2087 ihold(inode);
2088 req->r_inode_drop = release;
2089 req->r_args.setattr.mask = cpu_to_le32(mask);
2090 req->r_num_caps = 1;
2091 req->r_stamp = attr->ia_ctime;
2092 err = ceph_mdsc_do_request(mdsc, NULL, req);
2093 }
2094 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
2095 ceph_cap_string(dirtied), mask);
2096
2097 ceph_mdsc_put_request(req);
2098 ceph_free_cap_flush(prealloc_cf);
2099
2100 if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
2101 __ceph_do_pending_vmtruncate(inode);
2102
2103 return err;
2104 }
2105
2106 /*
2107 * setattr
2108 */
2109 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
2110 {
2111 struct inode *inode = d_inode(dentry);
2112 int err;
2113
2114 if (ceph_snap(inode) != CEPH_NOSNAP)
2115 return -EROFS;
2116
2117 err = setattr_prepare(dentry, attr);
2118 if (err != 0)
2119 return err;
2120
2121 err = __ceph_setattr(inode, attr);
2122
2123 if (err >= 0 && (attr->ia_valid & ATTR_MODE))
2124 err = posix_acl_chmod(inode, attr->ia_mode);
2125
2126 return err;
2127 }
2128
2129 /*
2130 * Verify that we have a lease on the given mask. If not,
2131 * do a getattr against an mds.
2132 */
2133 int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2134 int mask, bool force)
2135 {
2136 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2137 struct ceph_mds_client *mdsc = fsc->mdsc;
2138 struct ceph_mds_request *req;
2139 int err;
2140
2141 if (ceph_snap(inode) == CEPH_SNAPDIR) {
2142 dout("do_getattr inode %p SNAPDIR\n", inode);
2143 return 0;
2144 }
2145
2146 dout("do_getattr inode %p mask %s mode 0%o\n",
2147 inode, ceph_cap_string(mask), inode->i_mode);
2148 if (!force && ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
2149 return 0;
2150
2151 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
2152 if (IS_ERR(req))
2153 return PTR_ERR(req);
2154 req->r_inode = inode;
2155 ihold(inode);
2156 req->r_num_caps = 1;
2157 req->r_args.getattr.mask = cpu_to_le32(mask);
2158 req->r_locked_page = locked_page;
2159 err = ceph_mdsc_do_request(mdsc, NULL, req);
2160 if (locked_page && err == 0) {
2161 u64 inline_version = req->r_reply_info.targeti.inline_version;
2162 if (inline_version == 0) {
2163 /* the reply is supposed to contain inline data */
2164 err = -EINVAL;
2165 } else if (inline_version == CEPH_INLINE_NONE) {
2166 err = -ENODATA;
2167 } else {
2168 err = req->r_reply_info.targeti.inline_len;
2169 }
2170 }
2171 ceph_mdsc_put_request(req);
2172 dout("do_getattr result=%d\n", err);
2173 return err;
2174 }
2175
2176
2177 /*
2178 * Check inode permissions. We verify we have a valid value for
2179 * the AUTH cap, then call the generic handler.
2180 */
2181 int ceph_permission(struct inode *inode, int mask)
2182 {
2183 int err;
2184
2185 if (mask & MAY_NOT_BLOCK)
2186 return -ECHILD;
2187
2188 err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
2189
2190 if (!err)
2191 err = generic_permission(inode, mask);
2192 return err;
2193 }
2194
2195 /*
2196 * Get all attributes. Hopefully somedata we'll have a statlite()
2197 * and can limit the fields we require to be accurate.
2198 */
2199 int ceph_getattr(const struct path *path, struct kstat *stat,
2200 u32 request_mask, unsigned int flags)
2201 {
2202 struct inode *inode = d_inode(path->dentry);
2203 struct ceph_inode_info *ci = ceph_inode(inode);
2204 int err;
2205
2206 err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL, false);
2207 if (!err) {
2208 generic_fillattr(inode, stat);
2209 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
2210 if (ceph_snap(inode) != CEPH_NOSNAP)
2211 stat->dev = ceph_snap(inode);
2212 else
2213 stat->dev = 0;
2214 if (S_ISDIR(inode->i_mode)) {
2215 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
2216 RBYTES))
2217 stat->size = ci->i_rbytes;
2218 else
2219 stat->size = ci->i_files + ci->i_subdirs;
2220 stat->blocks = 0;
2221 stat->blksize = 65536;
2222 }
2223 }
2224 return err;
2225 }
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