1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ceph/ceph_debug.h>
3
4 #include <linux/module.h>
5 #include <linux/fs.h>
6 #include <linux/slab.h>
7 #include <linux/string.h>
8 #include <linux/uaccess.h>
9 #include <linux/kernel.h>
10 #include <linux/writeback.h>
11 #include <linux/vmalloc.h>
12 #include <linux/xattr.h>
13 #include <linux/posix_acl.h>
14 #include <linux/random.h>
15 #include <linux/sort.h>
16
17 #include "super.h"
18 #include "mds_client.h"
19 #include "cache.h"
20 #include <linux/ceph/decode.h>
21
22 /*
23 * Ceph inode operations
24 *
25 * Implement basic inode helpers (get, alloc) and inode ops (getattr,
26 * setattr, etc.), xattr helpers, and helpers for assimilating
27 * metadata returned by the MDS into our cache.
28 *
29 * Also define helpers for doing asynchronous writeback, invalidation,
30 * and truncation for the benefit of those who can't afford to block
31 * (typically because they are in the message handler path).
32 */
33
34 static const struct inode_operations ceph_symlink_iops;
35
36 static void ceph_invalidate_work(struct work_struct *work);
37 static void ceph_writeback_work(struct work_struct *work);
38 static void ceph_vmtruncate_work(struct work_struct *work);
39
40 /*
41 * find or create an inode, given the ceph ino number
42 */
ceph_set_ino_cb(struct inode * inode,void * data)43 static int ceph_set_ino_cb(struct inode *inode, void *data)
44 {
45 ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
46 inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
47 return 0;
48 }
49
ceph_get_inode(struct super_block * sb,struct ceph_vino vino)50 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
51 {
52 struct inode *inode;
53 ino_t t = ceph_vino_to_ino(vino);
54
55 inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
56 if (!inode)
57 return ERR_PTR(-ENOMEM);
58 if (inode->i_state & I_NEW) {
59 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
60 inode, ceph_vinop(inode), (u64)inode->i_ino);
61 unlock_new_inode(inode);
62 }
63
64 dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
65 vino.snap, inode);
66 return inode;
67 }
68
69 /*
70 * get/constuct snapdir inode for a given directory
71 */
ceph_get_snapdir(struct inode * parent)72 struct inode *ceph_get_snapdir(struct inode *parent)
73 {
74 struct ceph_vino vino = {
75 .ino = ceph_ino(parent),
76 .snap = CEPH_SNAPDIR,
77 };
78 struct inode *inode = ceph_get_inode(parent->i_sb, vino);
79 struct ceph_inode_info *ci = ceph_inode(inode);
80
81 BUG_ON(!S_ISDIR(parent->i_mode));
82 if (IS_ERR(inode))
83 return inode;
84 inode->i_mode = parent->i_mode;
85 inode->i_uid = parent->i_uid;
86 inode->i_gid = parent->i_gid;
87 inode->i_op = &ceph_snapdir_iops;
88 inode->i_fop = &ceph_snapdir_fops;
89 ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
90 ci->i_rbytes = 0;
91 return inode;
92 }
93
94 const struct inode_operations ceph_file_iops = {
95 .permission = ceph_permission,
96 .setattr = ceph_setattr,
97 .getattr = ceph_getattr,
98 .listxattr = ceph_listxattr,
99 .get_acl = ceph_get_acl,
100 .set_acl = ceph_set_acl,
101 };
102
103
104 /*
105 * We use a 'frag tree' to keep track of the MDS's directory fragments
106 * for a given inode (usually there is just a single fragment). We
107 * need to know when a child frag is delegated to a new MDS, or when
108 * it is flagged as replicated, so we can direct our requests
109 * accordingly.
110 */
111
112 /*
113 * find/create a frag in the tree
114 */
__get_or_create_frag(struct ceph_inode_info * ci,u32 f)115 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
116 u32 f)
117 {
118 struct rb_node **p;
119 struct rb_node *parent = NULL;
120 struct ceph_inode_frag *frag;
121 int c;
122
123 p = &ci->i_fragtree.rb_node;
124 while (*p) {
125 parent = *p;
126 frag = rb_entry(parent, struct ceph_inode_frag, node);
127 c = ceph_frag_compare(f, frag->frag);
128 if (c < 0)
129 p = &(*p)->rb_left;
130 else if (c > 0)
131 p = &(*p)->rb_right;
132 else
133 return frag;
134 }
135
136 frag = kmalloc(sizeof(*frag), GFP_NOFS);
137 if (!frag)
138 return ERR_PTR(-ENOMEM);
139
140 frag->frag = f;
141 frag->split_by = 0;
142 frag->mds = -1;
143 frag->ndist = 0;
144
145 rb_link_node(&frag->node, parent, p);
146 rb_insert_color(&frag->node, &ci->i_fragtree);
147
148 dout("get_or_create_frag added %llx.%llx frag %x\n",
149 ceph_vinop(&ci->vfs_inode), f);
150 return frag;
151 }
152
153 /*
154 * find a specific frag @f
155 */
__ceph_find_frag(struct ceph_inode_info * ci,u32 f)156 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
157 {
158 struct rb_node *n = ci->i_fragtree.rb_node;
159
160 while (n) {
161 struct ceph_inode_frag *frag =
162 rb_entry(n, struct ceph_inode_frag, node);
163 int c = ceph_frag_compare(f, frag->frag);
164 if (c < 0)
165 n = n->rb_left;
166 else if (c > 0)
167 n = n->rb_right;
168 else
169 return frag;
170 }
171 return NULL;
172 }
173
174 /*
175 * Choose frag containing the given value @v. If @pfrag is
176 * specified, copy the frag delegation info to the caller if
177 * it is present.
178 */
__ceph_choose_frag(struct ceph_inode_info * ci,u32 v,struct ceph_inode_frag * pfrag,int * found)179 static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
180 struct ceph_inode_frag *pfrag, int *found)
181 {
182 u32 t = ceph_frag_make(0, 0);
183 struct ceph_inode_frag *frag;
184 unsigned nway, i;
185 u32 n;
186
187 if (found)
188 *found = 0;
189
190 while (1) {
191 WARN_ON(!ceph_frag_contains_value(t, v));
192 frag = __ceph_find_frag(ci, t);
193 if (!frag)
194 break; /* t is a leaf */
195 if (frag->split_by == 0) {
196 if (pfrag)
197 memcpy(pfrag, frag, sizeof(*pfrag));
198 if (found)
199 *found = 1;
200 break;
201 }
202
203 /* choose child */
204 nway = 1 << frag->split_by;
205 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
206 frag->split_by, nway);
207 for (i = 0; i < nway; i++) {
208 n = ceph_frag_make_child(t, frag->split_by, i);
209 if (ceph_frag_contains_value(n, v)) {
210 t = n;
211 break;
212 }
213 }
214 BUG_ON(i == nway);
215 }
216 dout("choose_frag(%x) = %x\n", v, t);
217
218 return t;
219 }
220
ceph_choose_frag(struct ceph_inode_info * ci,u32 v,struct ceph_inode_frag * pfrag,int * found)221 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
222 struct ceph_inode_frag *pfrag, int *found)
223 {
224 u32 ret;
225 mutex_lock(&ci->i_fragtree_mutex);
226 ret = __ceph_choose_frag(ci, v, pfrag, found);
227 mutex_unlock(&ci->i_fragtree_mutex);
228 return ret;
229 }
230
231 /*
232 * Process dirfrag (delegation) info from the mds. Include leaf
233 * fragment in tree ONLY if ndist > 0. Otherwise, only
234 * branches/splits are included in i_fragtree)
235 */
ceph_fill_dirfrag(struct inode * inode,struct ceph_mds_reply_dirfrag * dirinfo)236 static int ceph_fill_dirfrag(struct inode *inode,
237 struct ceph_mds_reply_dirfrag *dirinfo)
238 {
239 struct ceph_inode_info *ci = ceph_inode(inode);
240 struct ceph_inode_frag *frag;
241 u32 id = le32_to_cpu(dirinfo->frag);
242 int mds = le32_to_cpu(dirinfo->auth);
243 int ndist = le32_to_cpu(dirinfo->ndist);
244 int diri_auth = -1;
245 int i;
246 int err = 0;
247
248 spin_lock(&ci->i_ceph_lock);
249 if (ci->i_auth_cap)
250 diri_auth = ci->i_auth_cap->mds;
251 spin_unlock(&ci->i_ceph_lock);
252
253 if (mds == -1) /* CDIR_AUTH_PARENT */
254 mds = diri_auth;
255
256 mutex_lock(&ci->i_fragtree_mutex);
257 if (ndist == 0 && mds == diri_auth) {
258 /* no delegation info needed. */
259 frag = __ceph_find_frag(ci, id);
260 if (!frag)
261 goto out;
262 if (frag->split_by == 0) {
263 /* tree leaf, remove */
264 dout("fill_dirfrag removed %llx.%llx frag %x"
265 " (no ref)\n", ceph_vinop(inode), id);
266 rb_erase(&frag->node, &ci->i_fragtree);
267 kfree(frag);
268 } else {
269 /* tree branch, keep and clear */
270 dout("fill_dirfrag cleared %llx.%llx frag %x"
271 " referral\n", ceph_vinop(inode), id);
272 frag->mds = -1;
273 frag->ndist = 0;
274 }
275 goto out;
276 }
277
278
279 /* find/add this frag to store mds delegation info */
280 frag = __get_or_create_frag(ci, id);
281 if (IS_ERR(frag)) {
282 /* this is not the end of the world; we can continue
283 with bad/inaccurate delegation info */
284 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
285 ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
286 err = -ENOMEM;
287 goto out;
288 }
289
290 frag->mds = mds;
291 frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
292 for (i = 0; i < frag->ndist; i++)
293 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
294 dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
295 ceph_vinop(inode), frag->frag, frag->ndist);
296
297 out:
298 mutex_unlock(&ci->i_fragtree_mutex);
299 return err;
300 }
301
frag_tree_split_cmp(const void * l,const void * r)302 static int frag_tree_split_cmp(const void *l, const void *r)
303 {
304 struct ceph_frag_tree_split *ls = (struct ceph_frag_tree_split*)l;
305 struct ceph_frag_tree_split *rs = (struct ceph_frag_tree_split*)r;
306 return ceph_frag_compare(le32_to_cpu(ls->frag),
307 le32_to_cpu(rs->frag));
308 }
309
is_frag_child(u32 f,struct ceph_inode_frag * frag)310 static bool is_frag_child(u32 f, struct ceph_inode_frag *frag)
311 {
312 if (!frag)
313 return f == ceph_frag_make(0, 0);
314 if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by)
315 return false;
316 return ceph_frag_contains_value(frag->frag, ceph_frag_value(f));
317 }
318
ceph_fill_fragtree(struct inode * inode,struct ceph_frag_tree_head * fragtree,struct ceph_mds_reply_dirfrag * dirinfo)319 static int ceph_fill_fragtree(struct inode *inode,
320 struct ceph_frag_tree_head *fragtree,
321 struct ceph_mds_reply_dirfrag *dirinfo)
322 {
323 struct ceph_inode_info *ci = ceph_inode(inode);
324 struct ceph_inode_frag *frag, *prev_frag = NULL;
325 struct rb_node *rb_node;
326 unsigned i, split_by, nsplits;
327 u32 id;
328 bool update = false;
329
330 mutex_lock(&ci->i_fragtree_mutex);
331 nsplits = le32_to_cpu(fragtree->nsplits);
332 if (nsplits != ci->i_fragtree_nsplits) {
333 update = true;
334 } else if (nsplits) {
335 i = prandom_u32() % nsplits;
336 id = le32_to_cpu(fragtree->splits[i].frag);
337 if (!__ceph_find_frag(ci, id))
338 update = true;
339 } else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) {
340 rb_node = rb_first(&ci->i_fragtree);
341 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
342 if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node))
343 update = true;
344 }
345 if (!update && dirinfo) {
346 id = le32_to_cpu(dirinfo->frag);
347 if (id != __ceph_choose_frag(ci, id, NULL, NULL))
348 update = true;
349 }
350 if (!update)
351 goto out_unlock;
352
353 if (nsplits > 1) {
354 sort(fragtree->splits, nsplits, sizeof(fragtree->splits[0]),
355 frag_tree_split_cmp, NULL);
356 }
357
358 dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode));
359 rb_node = rb_first(&ci->i_fragtree);
360 for (i = 0; i < nsplits; i++) {
361 id = le32_to_cpu(fragtree->splits[i].frag);
362 split_by = le32_to_cpu(fragtree->splits[i].by);
363 if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) {
364 pr_err("fill_fragtree %llx.%llx invalid split %d/%u, "
365 "frag %x split by %d\n", ceph_vinop(inode),
366 i, nsplits, id, split_by);
367 continue;
368 }
369 frag = NULL;
370 while (rb_node) {
371 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
372 if (ceph_frag_compare(frag->frag, id) >= 0) {
373 if (frag->frag != id)
374 frag = NULL;
375 else
376 rb_node = rb_next(rb_node);
377 break;
378 }
379 rb_node = rb_next(rb_node);
380 /* delete stale split/leaf node */
381 if (frag->split_by > 0 ||
382 !is_frag_child(frag->frag, prev_frag)) {
383 rb_erase(&frag->node, &ci->i_fragtree);
384 if (frag->split_by > 0)
385 ci->i_fragtree_nsplits--;
386 kfree(frag);
387 }
388 frag = NULL;
389 }
390 if (!frag) {
391 frag = __get_or_create_frag(ci, id);
392 if (IS_ERR(frag))
393 continue;
394 }
395 if (frag->split_by == 0)
396 ci->i_fragtree_nsplits++;
397 frag->split_by = split_by;
398 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
399 prev_frag = frag;
400 }
401 while (rb_node) {
402 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
403 rb_node = rb_next(rb_node);
404 /* delete stale split/leaf node */
405 if (frag->split_by > 0 ||
406 !is_frag_child(frag->frag, prev_frag)) {
407 rb_erase(&frag->node, &ci->i_fragtree);
408 if (frag->split_by > 0)
409 ci->i_fragtree_nsplits--;
410 kfree(frag);
411 }
412 }
413 out_unlock:
414 mutex_unlock(&ci->i_fragtree_mutex);
415 return 0;
416 }
417
418 /*
419 * initialize a newly allocated inode.
420 */
ceph_alloc_inode(struct super_block * sb)421 struct inode *ceph_alloc_inode(struct super_block *sb)
422 {
423 struct ceph_inode_info *ci;
424 int i;
425
426 ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
427 if (!ci)
428 return NULL;
429
430 dout("alloc_inode %p\n", &ci->vfs_inode);
431
432 spin_lock_init(&ci->i_ceph_lock);
433
434 ci->i_version = 0;
435 ci->i_inline_version = 0;
436 ci->i_time_warp_seq = 0;
437 ci->i_ceph_flags = 0;
438 atomic64_set(&ci->i_ordered_count, 1);
439 atomic64_set(&ci->i_release_count, 1);
440 atomic64_set(&ci->i_complete_seq[0], 0);
441 atomic64_set(&ci->i_complete_seq[1], 0);
442 ci->i_symlink = NULL;
443
444 ci->i_max_bytes = 0;
445 ci->i_max_files = 0;
446
447 memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
448 RCU_INIT_POINTER(ci->i_layout.pool_ns, NULL);
449
450 ci->i_fragtree = RB_ROOT;
451 mutex_init(&ci->i_fragtree_mutex);
452
453 ci->i_xattrs.blob = NULL;
454 ci->i_xattrs.prealloc_blob = NULL;
455 ci->i_xattrs.dirty = false;
456 ci->i_xattrs.index = RB_ROOT;
457 ci->i_xattrs.count = 0;
458 ci->i_xattrs.names_size = 0;
459 ci->i_xattrs.vals_size = 0;
460 ci->i_xattrs.version = 0;
461 ci->i_xattrs.index_version = 0;
462
463 ci->i_caps = RB_ROOT;
464 ci->i_auth_cap = NULL;
465 ci->i_dirty_caps = 0;
466 ci->i_flushing_caps = 0;
467 INIT_LIST_HEAD(&ci->i_dirty_item);
468 INIT_LIST_HEAD(&ci->i_flushing_item);
469 ci->i_prealloc_cap_flush = NULL;
470 INIT_LIST_HEAD(&ci->i_cap_flush_list);
471 init_waitqueue_head(&ci->i_cap_wq);
472 ci->i_hold_caps_min = 0;
473 ci->i_hold_caps_max = 0;
474 INIT_LIST_HEAD(&ci->i_cap_delay_list);
475 INIT_LIST_HEAD(&ci->i_cap_snaps);
476 ci->i_head_snapc = NULL;
477 ci->i_snap_caps = 0;
478
479 for (i = 0; i < CEPH_FILE_MODE_BITS; i++)
480 ci->i_nr_by_mode[i] = 0;
481
482 mutex_init(&ci->i_truncate_mutex);
483 ci->i_truncate_seq = 0;
484 ci->i_truncate_size = 0;
485 ci->i_truncate_pending = 0;
486
487 ci->i_max_size = 0;
488 ci->i_reported_size = 0;
489 ci->i_wanted_max_size = 0;
490 ci->i_requested_max_size = 0;
491
492 ci->i_pin_ref = 0;
493 ci->i_rd_ref = 0;
494 ci->i_rdcache_ref = 0;
495 ci->i_wr_ref = 0;
496 ci->i_wb_ref = 0;
497 ci->i_wrbuffer_ref = 0;
498 ci->i_wrbuffer_ref_head = 0;
499 atomic_set(&ci->i_filelock_ref, 0);
500 atomic_set(&ci->i_shared_gen, 0);
501 ci->i_rdcache_gen = 0;
502 ci->i_rdcache_revoking = 0;
503
504 INIT_LIST_HEAD(&ci->i_unsafe_dirops);
505 INIT_LIST_HEAD(&ci->i_unsafe_iops);
506 spin_lock_init(&ci->i_unsafe_lock);
507
508 ci->i_snap_realm = NULL;
509 INIT_LIST_HEAD(&ci->i_snap_realm_item);
510 INIT_LIST_HEAD(&ci->i_snap_flush_item);
511
512 INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
513 INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
514
515 INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
516
517 ceph_fscache_inode_init(ci);
518
519 return &ci->vfs_inode;
520 }
521
ceph_i_callback(struct rcu_head * head)522 static void ceph_i_callback(struct rcu_head *head)
523 {
524 struct inode *inode = container_of(head, struct inode, i_rcu);
525 struct ceph_inode_info *ci = ceph_inode(inode);
526
527 kfree(ci->i_symlink);
528 kmem_cache_free(ceph_inode_cachep, ci);
529 }
530
ceph_evict_inode(struct inode * inode)531 void ceph_evict_inode(struct inode *inode)
532 {
533 struct ceph_inode_info *ci = ceph_inode(inode);
534 struct ceph_inode_frag *frag;
535 struct rb_node *n;
536
537 dout("evict_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
538
539 truncate_inode_pages_final(&inode->i_data);
540 clear_inode(inode);
541
542 ceph_fscache_unregister_inode_cookie(ci);
543
544 ceph_queue_caps_release(inode);
545
546 if (__ceph_has_any_quota(ci))
547 ceph_adjust_quota_realms_count(inode, false);
548
549 /*
550 * we may still have a snap_realm reference if there are stray
551 * caps in i_snap_caps.
552 */
553 if (ci->i_snap_realm) {
554 struct ceph_mds_client *mdsc =
555 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
556 struct ceph_snap_realm *realm = ci->i_snap_realm;
557
558 dout(" dropping residual ref to snap realm %p\n", realm);
559 spin_lock(&realm->inodes_with_caps_lock);
560 list_del_init(&ci->i_snap_realm_item);
561 ci->i_snap_realm = NULL;
562 if (realm->ino == ci->i_vino.ino)
563 realm->inode = NULL;
564 spin_unlock(&realm->inodes_with_caps_lock);
565 ceph_put_snap_realm(mdsc, realm);
566 }
567
568 while ((n = rb_first(&ci->i_fragtree)) != NULL) {
569 frag = rb_entry(n, struct ceph_inode_frag, node);
570 rb_erase(n, &ci->i_fragtree);
571 kfree(frag);
572 }
573 ci->i_fragtree_nsplits = 0;
574
575 __ceph_destroy_xattrs(ci);
576 if (ci->i_xattrs.blob)
577 ceph_buffer_put(ci->i_xattrs.blob);
578 if (ci->i_xattrs.prealloc_blob)
579 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
580
581 ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns));
582 }
583
ceph_destroy_inode(struct inode * inode)584 void ceph_destroy_inode(struct inode *inode)
585 {
586 call_rcu(&inode->i_rcu, ceph_i_callback);
587 }
588
ceph_drop_inode(struct inode * inode)589 int ceph_drop_inode(struct inode *inode)
590 {
591 /*
592 * Positve dentry and corresponding inode are always accompanied
593 * in MDS reply. So no need to keep inode in the cache after
594 * dropping all its aliases.
595 */
596 return 1;
597 }
598
calc_inode_blocks(u64 size)599 static inline blkcnt_t calc_inode_blocks(u64 size)
600 {
601 return (size + (1<<9) - 1) >> 9;
602 }
603
604 /*
605 * Helpers to fill in size, ctime, mtime, and atime. We have to be
606 * careful because either the client or MDS may have more up to date
607 * info, depending on which capabilities are held, and whether
608 * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime
609 * and size are monotonically increasing, except when utimes() or
610 * truncate() increments the corresponding _seq values.)
611 */
ceph_fill_file_size(struct inode * inode,int issued,u32 truncate_seq,u64 truncate_size,u64 size)612 int ceph_fill_file_size(struct inode *inode, int issued,
613 u32 truncate_seq, u64 truncate_size, u64 size)
614 {
615 struct ceph_inode_info *ci = ceph_inode(inode);
616 int queue_trunc = 0;
617
618 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
619 (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
620 dout("size %lld -> %llu\n", inode->i_size, size);
621 if (size > 0 && S_ISDIR(inode->i_mode)) {
622 pr_err("fill_file_size non-zero size for directory\n");
623 size = 0;
624 }
625 i_size_write(inode, size);
626 inode->i_blocks = calc_inode_blocks(size);
627 ci->i_reported_size = size;
628 if (truncate_seq != ci->i_truncate_seq) {
629 dout("truncate_seq %u -> %u\n",
630 ci->i_truncate_seq, truncate_seq);
631 ci->i_truncate_seq = truncate_seq;
632
633 /* the MDS should have revoked these caps */
634 WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
635 CEPH_CAP_FILE_RD |
636 CEPH_CAP_FILE_WR |
637 CEPH_CAP_FILE_LAZYIO));
638 /*
639 * If we hold relevant caps, or in the case where we're
640 * not the only client referencing this file and we
641 * don't hold those caps, then we need to check whether
642 * the file is either opened or mmaped
643 */
644 if ((issued & (CEPH_CAP_FILE_CACHE|
645 CEPH_CAP_FILE_BUFFER)) ||
646 mapping_mapped(inode->i_mapping) ||
647 __ceph_caps_file_wanted(ci)) {
648 ci->i_truncate_pending++;
649 queue_trunc = 1;
650 }
651 }
652 }
653 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
654 ci->i_truncate_size != truncate_size) {
655 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
656 truncate_size);
657 ci->i_truncate_size = truncate_size;
658 }
659
660 if (queue_trunc)
661 ceph_fscache_invalidate(inode);
662
663 return queue_trunc;
664 }
665
ceph_fill_file_time(struct inode * inode,int issued,u64 time_warp_seq,struct timespec64 * ctime,struct timespec64 * mtime,struct timespec64 * atime)666 void ceph_fill_file_time(struct inode *inode, int issued,
667 u64 time_warp_seq, struct timespec64 *ctime,
668 struct timespec64 *mtime, struct timespec64 *atime)
669 {
670 struct ceph_inode_info *ci = ceph_inode(inode);
671 int warn = 0;
672
673 if (issued & (CEPH_CAP_FILE_EXCL|
674 CEPH_CAP_FILE_WR|
675 CEPH_CAP_FILE_BUFFER|
676 CEPH_CAP_AUTH_EXCL|
677 CEPH_CAP_XATTR_EXCL)) {
678 if (ci->i_version == 0 ||
679 timespec64_compare(ctime, &inode->i_ctime) > 0) {
680 dout("ctime %lld.%09ld -> %lld.%09ld inc w/ cap\n",
681 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
682 ctime->tv_sec, ctime->tv_nsec);
683 inode->i_ctime = *ctime;
684 }
685 if (ci->i_version == 0 ||
686 ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
687 /* the MDS did a utimes() */
688 dout("mtime %lld.%09ld -> %lld.%09ld "
689 "tw %d -> %d\n",
690 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
691 mtime->tv_sec, mtime->tv_nsec,
692 ci->i_time_warp_seq, (int)time_warp_seq);
693
694 inode->i_mtime = *mtime;
695 inode->i_atime = *atime;
696 ci->i_time_warp_seq = time_warp_seq;
697 } else if (time_warp_seq == ci->i_time_warp_seq) {
698 /* nobody did utimes(); take the max */
699 if (timespec64_compare(mtime, &inode->i_mtime) > 0) {
700 dout("mtime %lld.%09ld -> %lld.%09ld inc\n",
701 inode->i_mtime.tv_sec,
702 inode->i_mtime.tv_nsec,
703 mtime->tv_sec, mtime->tv_nsec);
704 inode->i_mtime = *mtime;
705 }
706 if (timespec64_compare(atime, &inode->i_atime) > 0) {
707 dout("atime %lld.%09ld -> %lld.%09ld inc\n",
708 inode->i_atime.tv_sec,
709 inode->i_atime.tv_nsec,
710 atime->tv_sec, atime->tv_nsec);
711 inode->i_atime = *atime;
712 }
713 } else if (issued & CEPH_CAP_FILE_EXCL) {
714 /* we did a utimes(); ignore mds values */
715 } else {
716 warn = 1;
717 }
718 } else {
719 /* we have no write|excl caps; whatever the MDS says is true */
720 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
721 inode->i_ctime = *ctime;
722 inode->i_mtime = *mtime;
723 inode->i_atime = *atime;
724 ci->i_time_warp_seq = time_warp_seq;
725 } else {
726 warn = 1;
727 }
728 }
729 if (warn) /* time_warp_seq shouldn't go backwards */
730 dout("%p mds time_warp_seq %llu < %u\n",
731 inode, time_warp_seq, ci->i_time_warp_seq);
732 }
733
734 /*
735 * Populate an inode based on info from mds. May be called on new or
736 * existing inodes.
737 */
fill_inode(struct inode * inode,struct page * locked_page,struct ceph_mds_reply_info_in * iinfo,struct ceph_mds_reply_dirfrag * dirinfo,struct ceph_mds_session * session,unsigned long ttl_from,int cap_fmode,struct ceph_cap_reservation * caps_reservation)738 static int fill_inode(struct inode *inode, struct page *locked_page,
739 struct ceph_mds_reply_info_in *iinfo,
740 struct ceph_mds_reply_dirfrag *dirinfo,
741 struct ceph_mds_session *session,
742 unsigned long ttl_from, int cap_fmode,
743 struct ceph_cap_reservation *caps_reservation)
744 {
745 struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
746 struct ceph_mds_reply_inode *info = iinfo->in;
747 struct ceph_inode_info *ci = ceph_inode(inode);
748 int issued, new_issued, info_caps;
749 struct timespec64 mtime, atime, ctime;
750 struct ceph_buffer *xattr_blob = NULL;
751 struct ceph_buffer *old_blob = NULL;
752 struct ceph_string *pool_ns = NULL;
753 struct ceph_cap *new_cap = NULL;
754 int err = 0;
755 bool wake = false;
756 bool queue_trunc = false;
757 bool new_version = false;
758 bool fill_inline = false;
759
760 dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
761 inode, ceph_vinop(inode), le64_to_cpu(info->version),
762 ci->i_version);
763
764 info_caps = le32_to_cpu(info->cap.caps);
765
766 /* prealloc new cap struct */
767 if (info_caps && ceph_snap(inode) == CEPH_NOSNAP) {
768 new_cap = ceph_get_cap(mdsc, caps_reservation);
769 if (!new_cap)
770 return -ENOMEM;
771 }
772
773 /*
774 * prealloc xattr data, if it looks like we'll need it. only
775 * if len > 4 (meaning there are actually xattrs; the first 4
776 * bytes are the xattr count).
777 */
778 if (iinfo->xattr_len > 4) {
779 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
780 if (!xattr_blob)
781 pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
782 iinfo->xattr_len);
783 }
784
785 if (iinfo->pool_ns_len > 0)
786 pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data,
787 iinfo->pool_ns_len);
788
789 spin_lock(&ci->i_ceph_lock);
790
791 /*
792 * provided version will be odd if inode value is projected,
793 * even if stable. skip the update if we have newer stable
794 * info (ours>=theirs, e.g. due to racing mds replies), unless
795 * we are getting projected (unstable) info (in which case the
796 * version is odd, and we want ours>theirs).
797 * us them
798 * 2 2 skip
799 * 3 2 skip
800 * 3 3 update
801 */
802 if (ci->i_version == 0 ||
803 ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
804 le64_to_cpu(info->version) > (ci->i_version & ~1)))
805 new_version = true;
806
807 __ceph_caps_issued(ci, &issued);
808 issued |= __ceph_caps_dirty(ci);
809 new_issued = ~issued & info_caps;
810
811 /* update inode */
812 inode->i_rdev = le32_to_cpu(info->rdev);
813 /* directories have fl_stripe_unit set to zero */
814 if (le32_to_cpu(info->layout.fl_stripe_unit))
815 inode->i_blkbits =
816 fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
817 else
818 inode->i_blkbits = CEPH_BLOCK_SHIFT;
819
820 __ceph_update_quota(ci, iinfo->max_bytes, iinfo->max_files);
821
822 if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
823 (issued & CEPH_CAP_AUTH_EXCL) == 0) {
824 inode->i_mode = le32_to_cpu(info->mode);
825 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
826 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
827 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
828 from_kuid(&init_user_ns, inode->i_uid),
829 from_kgid(&init_user_ns, inode->i_gid));
830 }
831
832 if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
833 (issued & CEPH_CAP_LINK_EXCL) == 0)
834 set_nlink(inode, le32_to_cpu(info->nlink));
835
836 if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
837 /* be careful with mtime, atime, size */
838 ceph_decode_timespec64(&atime, &info->atime);
839 ceph_decode_timespec64(&mtime, &info->mtime);
840 ceph_decode_timespec64(&ctime, &info->ctime);
841 ceph_fill_file_time(inode, issued,
842 le32_to_cpu(info->time_warp_seq),
843 &ctime, &mtime, &atime);
844 }
845
846 if (new_version || (info_caps & CEPH_CAP_FILE_SHARED)) {
847 ci->i_files = le64_to_cpu(info->files);
848 ci->i_subdirs = le64_to_cpu(info->subdirs);
849 }
850
851 if (new_version ||
852 (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
853 s64 old_pool = ci->i_layout.pool_id;
854 struct ceph_string *old_ns;
855
856 ceph_file_layout_from_legacy(&ci->i_layout, &info->layout);
857 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
858 lockdep_is_held(&ci->i_ceph_lock));
859 rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns);
860
861 if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns)
862 ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
863
864 pool_ns = old_ns;
865
866 queue_trunc = ceph_fill_file_size(inode, issued,
867 le32_to_cpu(info->truncate_seq),
868 le64_to_cpu(info->truncate_size),
869 le64_to_cpu(info->size));
870 /* only update max_size on auth cap */
871 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
872 ci->i_max_size != le64_to_cpu(info->max_size)) {
873 dout("max_size %lld -> %llu\n", ci->i_max_size,
874 le64_to_cpu(info->max_size));
875 ci->i_max_size = le64_to_cpu(info->max_size);
876 }
877 }
878
879 /* layout and rstat are not tracked by capability, update them if
880 * the inode info is from auth mds */
881 if (new_version || (info->cap.flags & CEPH_CAP_FLAG_AUTH)) {
882 if (S_ISDIR(inode->i_mode)) {
883 ci->i_dir_layout = iinfo->dir_layout;
884 ci->i_rbytes = le64_to_cpu(info->rbytes);
885 ci->i_rfiles = le64_to_cpu(info->rfiles);
886 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
887 ceph_decode_timespec64(&ci->i_rctime, &info->rctime);
888 }
889 }
890
891 /* xattrs */
892 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
893 if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL)) &&
894 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
895 if (ci->i_xattrs.blob)
896 old_blob = ci->i_xattrs.blob;
897 ci->i_xattrs.blob = xattr_blob;
898 if (xattr_blob)
899 memcpy(ci->i_xattrs.blob->vec.iov_base,
900 iinfo->xattr_data, iinfo->xattr_len);
901 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
902 ceph_forget_all_cached_acls(inode);
903 xattr_blob = NULL;
904 }
905
906 /* finally update i_version */
907 if (le64_to_cpu(info->version) > ci->i_version)
908 ci->i_version = le64_to_cpu(info->version);
909
910 inode->i_mapping->a_ops = &ceph_aops;
911
912 switch (inode->i_mode & S_IFMT) {
913 case S_IFIFO:
914 case S_IFBLK:
915 case S_IFCHR:
916 case S_IFSOCK:
917 init_special_inode(inode, inode->i_mode, inode->i_rdev);
918 inode->i_op = &ceph_file_iops;
919 break;
920 case S_IFREG:
921 inode->i_op = &ceph_file_iops;
922 inode->i_fop = &ceph_file_fops;
923 break;
924 case S_IFLNK:
925 inode->i_op = &ceph_symlink_iops;
926 if (!ci->i_symlink) {
927 u32 symlen = iinfo->symlink_len;
928 char *sym;
929
930 spin_unlock(&ci->i_ceph_lock);
931
932 if (symlen != i_size_read(inode)) {
933 pr_err("fill_inode %llx.%llx BAD symlink "
934 "size %lld\n", ceph_vinop(inode),
935 i_size_read(inode));
936 i_size_write(inode, symlen);
937 inode->i_blocks = calc_inode_blocks(symlen);
938 }
939
940 err = -ENOMEM;
941 sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
942 if (!sym)
943 goto out;
944
945 spin_lock(&ci->i_ceph_lock);
946 if (!ci->i_symlink)
947 ci->i_symlink = sym;
948 else
949 kfree(sym); /* lost a race */
950 }
951 inode->i_link = ci->i_symlink;
952 break;
953 case S_IFDIR:
954 inode->i_op = &ceph_dir_iops;
955 inode->i_fop = &ceph_dir_fops;
956 break;
957 default:
958 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
959 ceph_vinop(inode), inode->i_mode);
960 }
961
962 /* were we issued a capability? */
963 if (info_caps) {
964 if (ceph_snap(inode) == CEPH_NOSNAP) {
965 ceph_add_cap(inode, session,
966 le64_to_cpu(info->cap.cap_id),
967 cap_fmode, info_caps,
968 le32_to_cpu(info->cap.wanted),
969 le32_to_cpu(info->cap.seq),
970 le32_to_cpu(info->cap.mseq),
971 le64_to_cpu(info->cap.realm),
972 info->cap.flags, &new_cap);
973
974 /* set dir completion flag? */
975 if (S_ISDIR(inode->i_mode) &&
976 ci->i_files == 0 && ci->i_subdirs == 0 &&
977 (info_caps & CEPH_CAP_FILE_SHARED) &&
978 (issued & CEPH_CAP_FILE_EXCL) == 0 &&
979 !__ceph_dir_is_complete(ci)) {
980 dout(" marking %p complete (empty)\n", inode);
981 i_size_write(inode, 0);
982 __ceph_dir_set_complete(ci,
983 atomic64_read(&ci->i_release_count),
984 atomic64_read(&ci->i_ordered_count));
985 }
986
987 wake = true;
988 } else {
989 dout(" %p got snap_caps %s\n", inode,
990 ceph_cap_string(info_caps));
991 ci->i_snap_caps |= info_caps;
992 if (cap_fmode >= 0)
993 __ceph_get_fmode(ci, cap_fmode);
994 }
995 } else if (cap_fmode >= 0) {
996 pr_warn("mds issued no caps on %llx.%llx\n",
997 ceph_vinop(inode));
998 __ceph_get_fmode(ci, cap_fmode);
999 }
1000
1001 if (iinfo->inline_version > 0 &&
1002 iinfo->inline_version >= ci->i_inline_version) {
1003 int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1004 ci->i_inline_version = iinfo->inline_version;
1005 if (ci->i_inline_version != CEPH_INLINE_NONE &&
1006 (locked_page || (info_caps & cache_caps)))
1007 fill_inline = true;
1008 }
1009
1010 spin_unlock(&ci->i_ceph_lock);
1011
1012 if (fill_inline)
1013 ceph_fill_inline_data(inode, locked_page,
1014 iinfo->inline_data, iinfo->inline_len);
1015
1016 if (wake)
1017 wake_up_all(&ci->i_cap_wq);
1018
1019 /* queue truncate if we saw i_size decrease */
1020 if (queue_trunc)
1021 ceph_queue_vmtruncate(inode);
1022
1023 /* populate frag tree */
1024 if (S_ISDIR(inode->i_mode))
1025 ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
1026
1027 /* update delegation info? */
1028 if (dirinfo)
1029 ceph_fill_dirfrag(inode, dirinfo);
1030
1031 err = 0;
1032 out:
1033 if (new_cap)
1034 ceph_put_cap(mdsc, new_cap);
1035 ceph_buffer_put(old_blob);
1036 ceph_buffer_put(xattr_blob);
1037 ceph_put_string(pool_ns);
1038 return err;
1039 }
1040
1041 /*
1042 * caller should hold session s_mutex.
1043 */
update_dentry_lease(struct dentry * dentry,struct ceph_mds_reply_lease * lease,struct ceph_mds_session * session,unsigned long from_time,struct ceph_vino * tgt_vino,struct ceph_vino * dir_vino)1044 static void update_dentry_lease(struct dentry *dentry,
1045 struct ceph_mds_reply_lease *lease,
1046 struct ceph_mds_session *session,
1047 unsigned long from_time,
1048 struct ceph_vino *tgt_vino,
1049 struct ceph_vino *dir_vino)
1050 {
1051 struct ceph_dentry_info *di = ceph_dentry(dentry);
1052 long unsigned duration = le32_to_cpu(lease->duration_ms);
1053 long unsigned ttl = from_time + (duration * HZ) / 1000;
1054 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
1055 struct inode *dir;
1056 struct ceph_mds_session *old_lease_session = NULL;
1057
1058 /*
1059 * Make sure dentry's inode matches tgt_vino. NULL tgt_vino means that
1060 * we expect a negative dentry.
1061 */
1062 if (!tgt_vino && d_really_is_positive(dentry))
1063 return;
1064
1065 if (tgt_vino && (d_really_is_negative(dentry) ||
1066 !ceph_ino_compare(d_inode(dentry), tgt_vino)))
1067 return;
1068
1069 spin_lock(&dentry->d_lock);
1070 dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
1071 dentry, duration, ttl);
1072
1073 dir = d_inode(dentry->d_parent);
1074
1075 /* make sure parent matches dir_vino */
1076 if (!ceph_ino_compare(dir, dir_vino))
1077 goto out_unlock;
1078
1079 /* only track leases on regular dentries */
1080 if (ceph_snap(dir) != CEPH_NOSNAP)
1081 goto out_unlock;
1082
1083 di->lease_shared_gen = atomic_read(&ceph_inode(dir)->i_shared_gen);
1084
1085 if (duration == 0)
1086 goto out_unlock;
1087
1088 if (di->lease_gen == session->s_cap_gen &&
1089 time_before(ttl, di->time))
1090 goto out_unlock; /* we already have a newer lease. */
1091
1092 if (di->lease_session && di->lease_session != session) {
1093 old_lease_session = di->lease_session;
1094 di->lease_session = NULL;
1095 }
1096
1097 ceph_dentry_lru_touch(dentry);
1098
1099 if (!di->lease_session)
1100 di->lease_session = ceph_get_mds_session(session);
1101 di->lease_gen = session->s_cap_gen;
1102 di->lease_seq = le32_to_cpu(lease->seq);
1103 di->lease_renew_after = half_ttl;
1104 di->lease_renew_from = 0;
1105 di->time = ttl;
1106 out_unlock:
1107 spin_unlock(&dentry->d_lock);
1108 if (old_lease_session)
1109 ceph_put_mds_session(old_lease_session);
1110 }
1111
1112 /*
1113 * splice a dentry to an inode.
1114 * caller must hold directory i_mutex for this to be safe.
1115 */
splice_dentry(struct dentry * dn,struct inode * in)1116 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in)
1117 {
1118 struct dentry *realdn;
1119
1120 BUG_ON(d_inode(dn));
1121
1122 if (S_ISDIR(in->i_mode)) {
1123 /* If inode is directory, d_splice_alias() below will remove
1124 * 'realdn' from its origin parent. We need to ensure that
1125 * origin parent's readdir cache will not reference 'realdn'
1126 */
1127 realdn = d_find_any_alias(in);
1128 if (realdn) {
1129 struct ceph_dentry_info *di = ceph_dentry(realdn);
1130 spin_lock(&realdn->d_lock);
1131
1132 realdn->d_op->d_prune(realdn);
1133
1134 di->time = jiffies;
1135 di->lease_shared_gen = 0;
1136 di->offset = 0;
1137
1138 spin_unlock(&realdn->d_lock);
1139 dput(realdn);
1140 }
1141 }
1142
1143 /* dn must be unhashed */
1144 if (!d_unhashed(dn))
1145 d_drop(dn);
1146 realdn = d_splice_alias(in, dn);
1147 if (IS_ERR(realdn)) {
1148 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
1149 PTR_ERR(realdn), dn, in, ceph_vinop(in));
1150 dn = realdn;
1151 /*
1152 * Caller should release 'dn' in the case of error.
1153 * If 'req->r_dentry' is passed to this function,
1154 * caller should leave 'req->r_dentry' untouched.
1155 */
1156 goto out;
1157 } else if (realdn) {
1158 dout("dn %p (%d) spliced with %p (%d) "
1159 "inode %p ino %llx.%llx\n",
1160 dn, d_count(dn),
1161 realdn, d_count(realdn),
1162 d_inode(realdn), ceph_vinop(d_inode(realdn)));
1163 dput(dn);
1164 dn = realdn;
1165 } else {
1166 BUG_ON(!ceph_dentry(dn));
1167 dout("dn %p attached to %p ino %llx.%llx\n",
1168 dn, d_inode(dn), ceph_vinop(d_inode(dn)));
1169 }
1170 out:
1171 return dn;
1172 }
1173
1174 /*
1175 * Incorporate results into the local cache. This is either just
1176 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1177 * after a lookup).
1178 *
1179 * A reply may contain
1180 * a directory inode along with a dentry.
1181 * and/or a target inode
1182 *
1183 * Called with snap_rwsem (read).
1184 */
ceph_fill_trace(struct super_block * sb,struct ceph_mds_request * req)1185 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
1186 {
1187 struct ceph_mds_session *session = req->r_session;
1188 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1189 struct inode *in = NULL;
1190 struct ceph_vino tvino, dvino;
1191 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1192 int err = 0;
1193
1194 dout("fill_trace %p is_dentry %d is_target %d\n", req,
1195 rinfo->head->is_dentry, rinfo->head->is_target);
1196
1197 if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1198 dout("fill_trace reply is empty!\n");
1199 if (rinfo->head->result == 0 && req->r_parent)
1200 ceph_invalidate_dir_request(req);
1201 return 0;
1202 }
1203
1204 if (rinfo->head->is_dentry) {
1205 struct inode *dir = req->r_parent;
1206
1207 if (dir) {
1208 err = fill_inode(dir, NULL,
1209 &rinfo->diri, rinfo->dirfrag,
1210 session, req->r_request_started, -1,
1211 &req->r_caps_reservation);
1212 if (err < 0)
1213 goto done;
1214 } else {
1215 WARN_ON_ONCE(1);
1216 }
1217
1218 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME) {
1219 struct qstr dname;
1220 struct dentry *dn, *parent;
1221
1222 BUG_ON(!rinfo->head->is_target);
1223 BUG_ON(req->r_dentry);
1224
1225 parent = d_find_any_alias(dir);
1226 BUG_ON(!parent);
1227
1228 dname.name = rinfo->dname;
1229 dname.len = rinfo->dname_len;
1230 dname.hash = full_name_hash(parent, dname.name, dname.len);
1231 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1232 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1233 retry_lookup:
1234 dn = d_lookup(parent, &dname);
1235 dout("d_lookup on parent=%p name=%.*s got %p\n",
1236 parent, dname.len, dname.name, dn);
1237
1238 if (!dn) {
1239 dn = d_alloc(parent, &dname);
1240 dout("d_alloc %p '%.*s' = %p\n", parent,
1241 dname.len, dname.name, dn);
1242 if (!dn) {
1243 dput(parent);
1244 err = -ENOMEM;
1245 goto done;
1246 }
1247 err = 0;
1248 } else if (d_really_is_positive(dn) &&
1249 (ceph_ino(d_inode(dn)) != tvino.ino ||
1250 ceph_snap(d_inode(dn)) != tvino.snap)) {
1251 dout(" dn %p points to wrong inode %p\n",
1252 dn, d_inode(dn));
1253 ceph_dir_clear_ordered(dir);
1254 d_delete(dn);
1255 dput(dn);
1256 goto retry_lookup;
1257 }
1258
1259 req->r_dentry = dn;
1260 dput(parent);
1261 }
1262 }
1263
1264 if (rinfo->head->is_target) {
1265 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1266 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1267
1268 in = ceph_get_inode(sb, tvino);
1269 if (IS_ERR(in)) {
1270 err = PTR_ERR(in);
1271 goto done;
1272 }
1273 req->r_target_inode = in;
1274
1275 err = fill_inode(in, req->r_locked_page, &rinfo->targeti, NULL,
1276 session, req->r_request_started,
1277 (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1278 rinfo->head->result == 0) ? req->r_fmode : -1,
1279 &req->r_caps_reservation);
1280 if (err < 0) {
1281 pr_err("fill_inode badness %p %llx.%llx\n",
1282 in, ceph_vinop(in));
1283 goto done;
1284 }
1285 }
1286
1287 /*
1288 * ignore null lease/binding on snapdir ENOENT, or else we
1289 * will have trouble splicing in the virtual snapdir later
1290 */
1291 if (rinfo->head->is_dentry &&
1292 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1293 test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1294 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1295 fsc->mount_options->snapdir_name,
1296 req->r_dentry->d_name.len))) {
1297 /*
1298 * lookup link rename : null -> possibly existing inode
1299 * mknod symlink mkdir : null -> new inode
1300 * unlink : linked -> null
1301 */
1302 struct inode *dir = req->r_parent;
1303 struct dentry *dn = req->r_dentry;
1304 bool have_dir_cap, have_lease;
1305
1306 BUG_ON(!dn);
1307 BUG_ON(!dir);
1308 BUG_ON(d_inode(dn->d_parent) != dir);
1309
1310 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1311 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1312
1313 BUG_ON(ceph_ino(dir) != dvino.ino);
1314 BUG_ON(ceph_snap(dir) != dvino.snap);
1315
1316 /* do we have a lease on the whole dir? */
1317 have_dir_cap =
1318 (le32_to_cpu(rinfo->diri.in->cap.caps) &
1319 CEPH_CAP_FILE_SHARED);
1320
1321 /* do we have a dn lease? */
1322 have_lease = have_dir_cap ||
1323 le32_to_cpu(rinfo->dlease->duration_ms);
1324 if (!have_lease)
1325 dout("fill_trace no dentry lease or dir cap\n");
1326
1327 /* rename? */
1328 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1329 struct inode *olddir = req->r_old_dentry_dir;
1330 BUG_ON(!olddir);
1331
1332 dout(" src %p '%pd' dst %p '%pd'\n",
1333 req->r_old_dentry,
1334 req->r_old_dentry,
1335 dn, dn);
1336 dout("fill_trace doing d_move %p -> %p\n",
1337 req->r_old_dentry, dn);
1338
1339 /* d_move screws up sibling dentries' offsets */
1340 ceph_dir_clear_ordered(dir);
1341 ceph_dir_clear_ordered(olddir);
1342
1343 d_move(req->r_old_dentry, dn);
1344 dout(" src %p '%pd' dst %p '%pd'\n",
1345 req->r_old_dentry,
1346 req->r_old_dentry,
1347 dn, dn);
1348
1349 /* ensure target dentry is invalidated, despite
1350 rehashing bug in vfs_rename_dir */
1351 ceph_invalidate_dentry_lease(dn);
1352
1353 dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1354 ceph_dentry(req->r_old_dentry)->offset);
1355
1356 dn = req->r_old_dentry; /* use old_dentry */
1357 }
1358
1359 /* null dentry? */
1360 if (!rinfo->head->is_target) {
1361 dout("fill_trace null dentry\n");
1362 if (d_really_is_positive(dn)) {
1363 dout("d_delete %p\n", dn);
1364 ceph_dir_clear_ordered(dir);
1365 d_delete(dn);
1366 } else if (have_lease) {
1367 if (d_unhashed(dn))
1368 d_add(dn, NULL);
1369 update_dentry_lease(dn, rinfo->dlease,
1370 session,
1371 req->r_request_started,
1372 NULL, &dvino);
1373 }
1374 goto done;
1375 }
1376
1377 /* attach proper inode */
1378 if (d_really_is_negative(dn)) {
1379 ceph_dir_clear_ordered(dir);
1380 ihold(in);
1381 dn = splice_dentry(dn, in);
1382 if (IS_ERR(dn)) {
1383 err = PTR_ERR(dn);
1384 goto done;
1385 }
1386 req->r_dentry = dn; /* may have spliced */
1387 } else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1388 dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1389 dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1390 ceph_vinop(in));
1391 d_invalidate(dn);
1392 have_lease = false;
1393 }
1394
1395 if (have_lease) {
1396 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1397 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1398 update_dentry_lease(dn, rinfo->dlease, session,
1399 req->r_request_started,
1400 &tvino, &dvino);
1401 }
1402 dout(" final dn %p\n", dn);
1403 } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1404 req->r_op == CEPH_MDS_OP_MKSNAP) &&
1405 test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1406 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1407 struct dentry *dn = req->r_dentry;
1408 struct inode *dir = req->r_parent;
1409
1410 /* fill out a snapdir LOOKUPSNAP dentry */
1411 BUG_ON(!dn);
1412 BUG_ON(!dir);
1413 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1414 dout(" linking snapped dir %p to dn %p\n", in, dn);
1415 ceph_dir_clear_ordered(dir);
1416 ihold(in);
1417 dn = splice_dentry(dn, in);
1418 if (IS_ERR(dn)) {
1419 err = PTR_ERR(dn);
1420 goto done;
1421 }
1422 req->r_dentry = dn; /* may have spliced */
1423 } else if (rinfo->head->is_dentry) {
1424 struct ceph_vino *ptvino = NULL;
1425
1426 if ((le32_to_cpu(rinfo->diri.in->cap.caps) & CEPH_CAP_FILE_SHARED) ||
1427 le32_to_cpu(rinfo->dlease->duration_ms)) {
1428 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1429 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1430
1431 if (rinfo->head->is_target) {
1432 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1433 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1434 ptvino = &tvino;
1435 }
1436
1437 update_dentry_lease(req->r_dentry, rinfo->dlease,
1438 session, req->r_request_started, ptvino,
1439 &dvino);
1440 } else {
1441 dout("%s: no dentry lease or dir cap\n", __func__);
1442 }
1443 }
1444 done:
1445 dout("fill_trace done err=%d\n", err);
1446 return err;
1447 }
1448
1449 /*
1450 * Prepopulate our cache with readdir results, leases, etc.
1451 */
readdir_prepopulate_inodes_only(struct ceph_mds_request * req,struct ceph_mds_session * session)1452 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1453 struct ceph_mds_session *session)
1454 {
1455 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1456 int i, err = 0;
1457
1458 for (i = 0; i < rinfo->dir_nr; i++) {
1459 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1460 struct ceph_vino vino;
1461 struct inode *in;
1462 int rc;
1463
1464 vino.ino = le64_to_cpu(rde->inode.in->ino);
1465 vino.snap = le64_to_cpu(rde->inode.in->snapid);
1466
1467 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1468 if (IS_ERR(in)) {
1469 err = PTR_ERR(in);
1470 dout("new_inode badness got %d\n", err);
1471 continue;
1472 }
1473 rc = fill_inode(in, NULL, &rde->inode, NULL, session,
1474 req->r_request_started, -1,
1475 &req->r_caps_reservation);
1476 if (rc < 0) {
1477 pr_err("fill_inode badness on %p got %d\n", in, rc);
1478 err = rc;
1479 }
1480 iput(in);
1481 }
1482
1483 return err;
1484 }
1485
ceph_readdir_cache_release(struct ceph_readdir_cache_control * ctl)1486 void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1487 {
1488 if (ctl->page) {
1489 kunmap(ctl->page);
1490 put_page(ctl->page);
1491 ctl->page = NULL;
1492 }
1493 }
1494
fill_readdir_cache(struct inode * dir,struct dentry * dn,struct ceph_readdir_cache_control * ctl,struct ceph_mds_request * req)1495 static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1496 struct ceph_readdir_cache_control *ctl,
1497 struct ceph_mds_request *req)
1498 {
1499 struct ceph_inode_info *ci = ceph_inode(dir);
1500 unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
1501 unsigned idx = ctl->index % nsize;
1502 pgoff_t pgoff = ctl->index / nsize;
1503
1504 if (!ctl->page || pgoff != page_index(ctl->page)) {
1505 ceph_readdir_cache_release(ctl);
1506 if (idx == 0)
1507 ctl->page = grab_cache_page(&dir->i_data, pgoff);
1508 else
1509 ctl->page = find_lock_page(&dir->i_data, pgoff);
1510 if (!ctl->page) {
1511 ctl->index = -1;
1512 return idx == 0 ? -ENOMEM : 0;
1513 }
1514 /* reading/filling the cache are serialized by
1515 * i_mutex, no need to use page lock */
1516 unlock_page(ctl->page);
1517 ctl->dentries = kmap(ctl->page);
1518 if (idx == 0)
1519 memset(ctl->dentries, 0, PAGE_SIZE);
1520 }
1521
1522 if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1523 req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1524 dout("readdir cache dn %p idx %d\n", dn, ctl->index);
1525 ctl->dentries[idx] = dn;
1526 ctl->index++;
1527 } else {
1528 dout("disable readdir cache\n");
1529 ctl->index = -1;
1530 }
1531 return 0;
1532 }
1533
ceph_readdir_prepopulate(struct ceph_mds_request * req,struct ceph_mds_session * session)1534 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1535 struct ceph_mds_session *session)
1536 {
1537 struct dentry *parent = req->r_dentry;
1538 struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
1539 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1540 struct qstr dname;
1541 struct dentry *dn;
1542 struct inode *in;
1543 int err = 0, skipped = 0, ret, i;
1544 struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1545 u32 frag = le32_to_cpu(rhead->args.readdir.frag);
1546 u32 last_hash = 0;
1547 u32 fpos_offset;
1548 struct ceph_readdir_cache_control cache_ctl = {};
1549
1550 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
1551 return readdir_prepopulate_inodes_only(req, session);
1552
1553 if (rinfo->hash_order) {
1554 if (req->r_path2) {
1555 last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1556 req->r_path2,
1557 strlen(req->r_path2));
1558 last_hash = ceph_frag_value(last_hash);
1559 } else if (rinfo->offset_hash) {
1560 /* mds understands offset_hash */
1561 WARN_ON_ONCE(req->r_readdir_offset != 2);
1562 last_hash = le32_to_cpu(rhead->args.readdir.offset_hash);
1563 }
1564 }
1565
1566 if (rinfo->dir_dir &&
1567 le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1568 dout("readdir_prepopulate got new frag %x -> %x\n",
1569 frag, le32_to_cpu(rinfo->dir_dir->frag));
1570 frag = le32_to_cpu(rinfo->dir_dir->frag);
1571 if (!rinfo->hash_order)
1572 req->r_readdir_offset = 2;
1573 }
1574
1575 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1576 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1577 rinfo->dir_nr, parent);
1578 } else {
1579 dout("readdir_prepopulate %d items under dn %p\n",
1580 rinfo->dir_nr, parent);
1581 if (rinfo->dir_dir)
1582 ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1583
1584 if (ceph_frag_is_leftmost(frag) &&
1585 req->r_readdir_offset == 2 &&
1586 !(rinfo->hash_order && last_hash)) {
1587 /* note dir version at start of readdir so we can
1588 * tell if any dentries get dropped */
1589 req->r_dir_release_cnt =
1590 atomic64_read(&ci->i_release_count);
1591 req->r_dir_ordered_cnt =
1592 atomic64_read(&ci->i_ordered_count);
1593 req->r_readdir_cache_idx = 0;
1594 }
1595 }
1596
1597 cache_ctl.index = req->r_readdir_cache_idx;
1598 fpos_offset = req->r_readdir_offset;
1599
1600 /* FIXME: release caps/leases if error occurs */
1601 for (i = 0; i < rinfo->dir_nr; i++) {
1602 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1603 struct ceph_vino tvino, dvino;
1604
1605 dname.name = rde->name;
1606 dname.len = rde->name_len;
1607 dname.hash = full_name_hash(parent, dname.name, dname.len);
1608
1609 tvino.ino = le64_to_cpu(rde->inode.in->ino);
1610 tvino.snap = le64_to_cpu(rde->inode.in->snapid);
1611
1612 if (rinfo->hash_order) {
1613 u32 hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1614 rde->name, rde->name_len);
1615 hash = ceph_frag_value(hash);
1616 if (hash != last_hash)
1617 fpos_offset = 2;
1618 last_hash = hash;
1619 rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
1620 } else {
1621 rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
1622 }
1623
1624 retry_lookup:
1625 dn = d_lookup(parent, &dname);
1626 dout("d_lookup on parent=%p name=%.*s got %p\n",
1627 parent, dname.len, dname.name, dn);
1628
1629 if (!dn) {
1630 dn = d_alloc(parent, &dname);
1631 dout("d_alloc %p '%.*s' = %p\n", parent,
1632 dname.len, dname.name, dn);
1633 if (!dn) {
1634 dout("d_alloc badness\n");
1635 err = -ENOMEM;
1636 goto out;
1637 }
1638 } else if (d_really_is_positive(dn) &&
1639 (ceph_ino(d_inode(dn)) != tvino.ino ||
1640 ceph_snap(d_inode(dn)) != tvino.snap)) {
1641 struct ceph_dentry_info *di = ceph_dentry(dn);
1642 dout(" dn %p points to wrong inode %p\n",
1643 dn, d_inode(dn));
1644
1645 spin_lock(&dn->d_lock);
1646 if (di->offset > 0 &&
1647 di->lease_shared_gen ==
1648 atomic_read(&ci->i_shared_gen)) {
1649 __ceph_dir_clear_ordered(ci);
1650 di->offset = 0;
1651 }
1652 spin_unlock(&dn->d_lock);
1653
1654 d_delete(dn);
1655 dput(dn);
1656 goto retry_lookup;
1657 }
1658
1659 /* inode */
1660 if (d_really_is_positive(dn)) {
1661 in = d_inode(dn);
1662 } else {
1663 in = ceph_get_inode(parent->d_sb, tvino);
1664 if (IS_ERR(in)) {
1665 dout("new_inode badness\n");
1666 d_drop(dn);
1667 dput(dn);
1668 err = PTR_ERR(in);
1669 goto out;
1670 }
1671 }
1672
1673 ret = fill_inode(in, NULL, &rde->inode, NULL, session,
1674 req->r_request_started, -1,
1675 &req->r_caps_reservation);
1676 if (ret < 0) {
1677 pr_err("fill_inode badness on %p\n", in);
1678 if (d_really_is_negative(dn))
1679 iput(in);
1680 d_drop(dn);
1681 err = ret;
1682 goto next_item;
1683 }
1684
1685 if (d_really_is_negative(dn)) {
1686 struct dentry *realdn;
1687
1688 if (ceph_security_xattr_deadlock(in)) {
1689 dout(" skip splicing dn %p to inode %p"
1690 " (security xattr deadlock)\n", dn, in);
1691 iput(in);
1692 skipped++;
1693 goto next_item;
1694 }
1695
1696 realdn = splice_dentry(dn, in);
1697 if (IS_ERR(realdn)) {
1698 err = PTR_ERR(realdn);
1699 d_drop(dn);
1700 goto next_item;
1701 }
1702 dn = realdn;
1703 }
1704
1705 ceph_dentry(dn)->offset = rde->offset;
1706
1707 dvino = ceph_vino(d_inode(parent));
1708 update_dentry_lease(dn, rde->lease, req->r_session,
1709 req->r_request_started, &tvino, &dvino);
1710
1711 if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
1712 ret = fill_readdir_cache(d_inode(parent), dn,
1713 &cache_ctl, req);
1714 if (ret < 0)
1715 err = ret;
1716 }
1717 next_item:
1718 if (dn)
1719 dput(dn);
1720 }
1721 out:
1722 if (err == 0 && skipped == 0) {
1723 set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
1724 req->r_readdir_cache_idx = cache_ctl.index;
1725 }
1726 ceph_readdir_cache_release(&cache_ctl);
1727 dout("readdir_prepopulate done\n");
1728 return err;
1729 }
1730
ceph_inode_set_size(struct inode * inode,loff_t size)1731 bool ceph_inode_set_size(struct inode *inode, loff_t size)
1732 {
1733 struct ceph_inode_info *ci = ceph_inode(inode);
1734 bool ret;
1735
1736 spin_lock(&ci->i_ceph_lock);
1737 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1738 i_size_write(inode, size);
1739 inode->i_blocks = calc_inode_blocks(size);
1740
1741 ret = __ceph_should_report_size(ci);
1742
1743 spin_unlock(&ci->i_ceph_lock);
1744 return ret;
1745 }
1746
1747 /*
1748 * Write back inode data in a worker thread. (This can't be done
1749 * in the message handler context.)
1750 */
ceph_queue_writeback(struct inode * inode)1751 void ceph_queue_writeback(struct inode *inode)
1752 {
1753 ihold(inode);
1754 if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1755 &ceph_inode(inode)->i_wb_work)) {
1756 dout("ceph_queue_writeback %p\n", inode);
1757 } else {
1758 dout("ceph_queue_writeback %p failed\n", inode);
1759 iput(inode);
1760 }
1761 }
1762
ceph_writeback_work(struct work_struct * work)1763 static void ceph_writeback_work(struct work_struct *work)
1764 {
1765 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1766 i_wb_work);
1767 struct inode *inode = &ci->vfs_inode;
1768
1769 dout("writeback %p\n", inode);
1770 filemap_fdatawrite(&inode->i_data);
1771 iput(inode);
1772 }
1773
1774 /*
1775 * queue an async invalidation
1776 */
ceph_queue_invalidate(struct inode * inode)1777 void ceph_queue_invalidate(struct inode *inode)
1778 {
1779 ihold(inode);
1780 if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1781 &ceph_inode(inode)->i_pg_inv_work)) {
1782 dout("ceph_queue_invalidate %p\n", inode);
1783 } else {
1784 dout("ceph_queue_invalidate %p failed\n", inode);
1785 iput(inode);
1786 }
1787 }
1788
1789 /*
1790 * Invalidate inode pages in a worker thread. (This can't be done
1791 * in the message handler context.)
1792 */
ceph_invalidate_work(struct work_struct * work)1793 static void ceph_invalidate_work(struct work_struct *work)
1794 {
1795 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1796 i_pg_inv_work);
1797 struct inode *inode = &ci->vfs_inode;
1798 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1799 u32 orig_gen;
1800 int check = 0;
1801
1802 mutex_lock(&ci->i_truncate_mutex);
1803
1804 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
1805 pr_warn_ratelimited("invalidate_pages %p %lld forced umount\n",
1806 inode, ceph_ino(inode));
1807 mapping_set_error(inode->i_mapping, -EIO);
1808 truncate_pagecache(inode, 0);
1809 mutex_unlock(&ci->i_truncate_mutex);
1810 goto out;
1811 }
1812
1813 spin_lock(&ci->i_ceph_lock);
1814 dout("invalidate_pages %p gen %d revoking %d\n", inode,
1815 ci->i_rdcache_gen, ci->i_rdcache_revoking);
1816 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1817 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1818 check = 1;
1819 spin_unlock(&ci->i_ceph_lock);
1820 mutex_unlock(&ci->i_truncate_mutex);
1821 goto out;
1822 }
1823 orig_gen = ci->i_rdcache_gen;
1824 spin_unlock(&ci->i_ceph_lock);
1825
1826 ceph_fscache_invalidate(inode);
1827 if (invalidate_inode_pages2(inode->i_mapping) < 0) {
1828 pr_err("invalidate_pages %p fails\n", inode);
1829 }
1830
1831 spin_lock(&ci->i_ceph_lock);
1832 if (orig_gen == ci->i_rdcache_gen &&
1833 orig_gen == ci->i_rdcache_revoking) {
1834 dout("invalidate_pages %p gen %d successful\n", inode,
1835 ci->i_rdcache_gen);
1836 ci->i_rdcache_revoking--;
1837 check = 1;
1838 } else {
1839 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1840 inode, orig_gen, ci->i_rdcache_gen,
1841 ci->i_rdcache_revoking);
1842 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1843 check = 1;
1844 }
1845 spin_unlock(&ci->i_ceph_lock);
1846 mutex_unlock(&ci->i_truncate_mutex);
1847 out:
1848 if (check)
1849 ceph_check_caps(ci, 0, NULL);
1850 iput(inode);
1851 }
1852
1853
1854 /*
1855 * called by trunc_wq;
1856 *
1857 * We also truncate in a separate thread as well.
1858 */
ceph_vmtruncate_work(struct work_struct * work)1859 static void ceph_vmtruncate_work(struct work_struct *work)
1860 {
1861 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1862 i_vmtruncate_work);
1863 struct inode *inode = &ci->vfs_inode;
1864
1865 dout("vmtruncate_work %p\n", inode);
1866 __ceph_do_pending_vmtruncate(inode);
1867 iput(inode);
1868 }
1869
1870 /*
1871 * Queue an async vmtruncate. If we fail to queue work, we will handle
1872 * the truncation the next time we call __ceph_do_pending_vmtruncate.
1873 */
ceph_queue_vmtruncate(struct inode * inode)1874 void ceph_queue_vmtruncate(struct inode *inode)
1875 {
1876 struct ceph_inode_info *ci = ceph_inode(inode);
1877
1878 ihold(inode);
1879
1880 if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1881 &ci->i_vmtruncate_work)) {
1882 dout("ceph_queue_vmtruncate %p\n", inode);
1883 } else {
1884 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1885 inode, ci->i_truncate_pending);
1886 iput(inode);
1887 }
1888 }
1889
1890 /*
1891 * Make sure any pending truncation is applied before doing anything
1892 * that may depend on it.
1893 */
__ceph_do_pending_vmtruncate(struct inode * inode)1894 void __ceph_do_pending_vmtruncate(struct inode *inode)
1895 {
1896 struct ceph_inode_info *ci = ceph_inode(inode);
1897 u64 to;
1898 int wrbuffer_refs, finish = 0;
1899
1900 mutex_lock(&ci->i_truncate_mutex);
1901 retry:
1902 spin_lock(&ci->i_ceph_lock);
1903 if (ci->i_truncate_pending == 0) {
1904 dout("__do_pending_vmtruncate %p none pending\n", inode);
1905 spin_unlock(&ci->i_ceph_lock);
1906 mutex_unlock(&ci->i_truncate_mutex);
1907 return;
1908 }
1909
1910 /*
1911 * make sure any dirty snapped pages are flushed before we
1912 * possibly truncate them.. so write AND block!
1913 */
1914 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1915 spin_unlock(&ci->i_ceph_lock);
1916 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1917 inode);
1918 filemap_write_and_wait_range(&inode->i_data, 0,
1919 inode->i_sb->s_maxbytes);
1920 goto retry;
1921 }
1922
1923 /* there should be no reader or writer */
1924 WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1925
1926 to = ci->i_truncate_size;
1927 wrbuffer_refs = ci->i_wrbuffer_ref;
1928 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1929 ci->i_truncate_pending, to);
1930 spin_unlock(&ci->i_ceph_lock);
1931
1932 truncate_pagecache(inode, to);
1933
1934 spin_lock(&ci->i_ceph_lock);
1935 if (to == ci->i_truncate_size) {
1936 ci->i_truncate_pending = 0;
1937 finish = 1;
1938 }
1939 spin_unlock(&ci->i_ceph_lock);
1940 if (!finish)
1941 goto retry;
1942
1943 mutex_unlock(&ci->i_truncate_mutex);
1944
1945 if (wrbuffer_refs == 0)
1946 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1947
1948 wake_up_all(&ci->i_cap_wq);
1949 }
1950
1951 /*
1952 * symlinks
1953 */
1954 static const struct inode_operations ceph_symlink_iops = {
1955 .get_link = simple_get_link,
1956 .setattr = ceph_setattr,
1957 .getattr = ceph_getattr,
1958 .listxattr = ceph_listxattr,
1959 };
1960
__ceph_setattr(struct inode * inode,struct iattr * attr)1961 int __ceph_setattr(struct inode *inode, struct iattr *attr)
1962 {
1963 struct ceph_inode_info *ci = ceph_inode(inode);
1964 const unsigned int ia_valid = attr->ia_valid;
1965 struct ceph_mds_request *req;
1966 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
1967 struct ceph_cap_flush *prealloc_cf;
1968 int issued;
1969 int release = 0, dirtied = 0;
1970 int mask = 0;
1971 int err = 0;
1972 int inode_dirty_flags = 0;
1973 bool lock_snap_rwsem = false;
1974
1975 prealloc_cf = ceph_alloc_cap_flush();
1976 if (!prealloc_cf)
1977 return -ENOMEM;
1978
1979 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1980 USE_AUTH_MDS);
1981 if (IS_ERR(req)) {
1982 ceph_free_cap_flush(prealloc_cf);
1983 return PTR_ERR(req);
1984 }
1985
1986 spin_lock(&ci->i_ceph_lock);
1987 issued = __ceph_caps_issued(ci, NULL);
1988
1989 if (!ci->i_head_snapc &&
1990 (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
1991 lock_snap_rwsem = true;
1992 if (!down_read_trylock(&mdsc->snap_rwsem)) {
1993 spin_unlock(&ci->i_ceph_lock);
1994 down_read(&mdsc->snap_rwsem);
1995 spin_lock(&ci->i_ceph_lock);
1996 issued = __ceph_caps_issued(ci, NULL);
1997 }
1998 }
1999
2000 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
2001
2002 if (ia_valid & ATTR_UID) {
2003 dout("setattr %p uid %d -> %d\n", inode,
2004 from_kuid(&init_user_ns, inode->i_uid),
2005 from_kuid(&init_user_ns, attr->ia_uid));
2006 if (issued & CEPH_CAP_AUTH_EXCL) {
2007 inode->i_uid = attr->ia_uid;
2008 dirtied |= CEPH_CAP_AUTH_EXCL;
2009 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2010 !uid_eq(attr->ia_uid, inode->i_uid)) {
2011 req->r_args.setattr.uid = cpu_to_le32(
2012 from_kuid(&init_user_ns, attr->ia_uid));
2013 mask |= CEPH_SETATTR_UID;
2014 release |= CEPH_CAP_AUTH_SHARED;
2015 }
2016 }
2017 if (ia_valid & ATTR_GID) {
2018 dout("setattr %p gid %d -> %d\n", inode,
2019 from_kgid(&init_user_ns, inode->i_gid),
2020 from_kgid(&init_user_ns, attr->ia_gid));
2021 if (issued & CEPH_CAP_AUTH_EXCL) {
2022 inode->i_gid = attr->ia_gid;
2023 dirtied |= CEPH_CAP_AUTH_EXCL;
2024 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2025 !gid_eq(attr->ia_gid, inode->i_gid)) {
2026 req->r_args.setattr.gid = cpu_to_le32(
2027 from_kgid(&init_user_ns, attr->ia_gid));
2028 mask |= CEPH_SETATTR_GID;
2029 release |= CEPH_CAP_AUTH_SHARED;
2030 }
2031 }
2032 if (ia_valid & ATTR_MODE) {
2033 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
2034 attr->ia_mode);
2035 if (issued & CEPH_CAP_AUTH_EXCL) {
2036 inode->i_mode = attr->ia_mode;
2037 dirtied |= CEPH_CAP_AUTH_EXCL;
2038 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2039 attr->ia_mode != inode->i_mode) {
2040 inode->i_mode = attr->ia_mode;
2041 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
2042 mask |= CEPH_SETATTR_MODE;
2043 release |= CEPH_CAP_AUTH_SHARED;
2044 }
2045 }
2046
2047 if (ia_valid & ATTR_ATIME) {
2048 dout("setattr %p atime %lld.%ld -> %lld.%ld\n", inode,
2049 inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
2050 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
2051 if (issued & CEPH_CAP_FILE_EXCL) {
2052 ci->i_time_warp_seq++;
2053 inode->i_atime = attr->ia_atime;
2054 dirtied |= CEPH_CAP_FILE_EXCL;
2055 } else if ((issued & CEPH_CAP_FILE_WR) &&
2056 timespec64_compare(&inode->i_atime,
2057 &attr->ia_atime) < 0) {
2058 inode->i_atime = attr->ia_atime;
2059 dirtied |= CEPH_CAP_FILE_WR;
2060 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2061 !timespec64_equal(&inode->i_atime, &attr->ia_atime)) {
2062 ceph_encode_timespec64(&req->r_args.setattr.atime,
2063 &attr->ia_atime);
2064 mask |= CEPH_SETATTR_ATIME;
2065 release |= CEPH_CAP_FILE_SHARED |
2066 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2067 }
2068 }
2069 if (ia_valid & ATTR_MTIME) {
2070 dout("setattr %p mtime %lld.%ld -> %lld.%ld\n", inode,
2071 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
2072 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
2073 if (issued & CEPH_CAP_FILE_EXCL) {
2074 ci->i_time_warp_seq++;
2075 inode->i_mtime = attr->ia_mtime;
2076 dirtied |= CEPH_CAP_FILE_EXCL;
2077 } else if ((issued & CEPH_CAP_FILE_WR) &&
2078 timespec64_compare(&inode->i_mtime,
2079 &attr->ia_mtime) < 0) {
2080 inode->i_mtime = attr->ia_mtime;
2081 dirtied |= CEPH_CAP_FILE_WR;
2082 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2083 !timespec64_equal(&inode->i_mtime, &attr->ia_mtime)) {
2084 ceph_encode_timespec64(&req->r_args.setattr.mtime,
2085 &attr->ia_mtime);
2086 mask |= CEPH_SETATTR_MTIME;
2087 release |= CEPH_CAP_FILE_SHARED |
2088 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2089 }
2090 }
2091 if (ia_valid & ATTR_SIZE) {
2092 dout("setattr %p size %lld -> %lld\n", inode,
2093 inode->i_size, attr->ia_size);
2094 if ((issued & CEPH_CAP_FILE_EXCL) &&
2095 attr->ia_size > inode->i_size) {
2096 i_size_write(inode, attr->ia_size);
2097 inode->i_blocks = calc_inode_blocks(attr->ia_size);
2098 ci->i_reported_size = attr->ia_size;
2099 dirtied |= CEPH_CAP_FILE_EXCL;
2100 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2101 attr->ia_size != inode->i_size) {
2102 req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
2103 req->r_args.setattr.old_size =
2104 cpu_to_le64(inode->i_size);
2105 mask |= CEPH_SETATTR_SIZE;
2106 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2107 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2108 }
2109 }
2110
2111 /* these do nothing */
2112 if (ia_valid & ATTR_CTIME) {
2113 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
2114 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
2115 dout("setattr %p ctime %lld.%ld -> %lld.%ld (%s)\n", inode,
2116 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
2117 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
2118 only ? "ctime only" : "ignored");
2119 if (only) {
2120 /*
2121 * if kernel wants to dirty ctime but nothing else,
2122 * we need to choose a cap to dirty under, or do
2123 * a almost-no-op setattr
2124 */
2125 if (issued & CEPH_CAP_AUTH_EXCL)
2126 dirtied |= CEPH_CAP_AUTH_EXCL;
2127 else if (issued & CEPH_CAP_FILE_EXCL)
2128 dirtied |= CEPH_CAP_FILE_EXCL;
2129 else if (issued & CEPH_CAP_XATTR_EXCL)
2130 dirtied |= CEPH_CAP_XATTR_EXCL;
2131 else
2132 mask |= CEPH_SETATTR_CTIME;
2133 }
2134 }
2135 if (ia_valid & ATTR_FILE)
2136 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
2137
2138 if (dirtied) {
2139 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
2140 &prealloc_cf);
2141 inode->i_ctime = attr->ia_ctime;
2142 }
2143
2144 release &= issued;
2145 spin_unlock(&ci->i_ceph_lock);
2146 if (lock_snap_rwsem)
2147 up_read(&mdsc->snap_rwsem);
2148
2149 if (inode_dirty_flags)
2150 __mark_inode_dirty(inode, inode_dirty_flags);
2151
2152
2153 if (mask) {
2154 req->r_inode = inode;
2155 ihold(inode);
2156 req->r_inode_drop = release;
2157 req->r_args.setattr.mask = cpu_to_le32(mask);
2158 req->r_num_caps = 1;
2159 req->r_stamp = attr->ia_ctime;
2160 err = ceph_mdsc_do_request(mdsc, NULL, req);
2161 }
2162 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
2163 ceph_cap_string(dirtied), mask);
2164
2165 ceph_mdsc_put_request(req);
2166 ceph_free_cap_flush(prealloc_cf);
2167
2168 if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
2169 __ceph_do_pending_vmtruncate(inode);
2170
2171 return err;
2172 }
2173
2174 /*
2175 * setattr
2176 */
ceph_setattr(struct dentry * dentry,struct iattr * attr)2177 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
2178 {
2179 struct inode *inode = d_inode(dentry);
2180 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
2181 int err;
2182
2183 if (ceph_snap(inode) != CEPH_NOSNAP)
2184 return -EROFS;
2185
2186 err = setattr_prepare(dentry, attr);
2187 if (err != 0)
2188 return err;
2189
2190 if ((attr->ia_valid & ATTR_SIZE) &&
2191 attr->ia_size > max(inode->i_size, fsc->max_file_size))
2192 return -EFBIG;
2193
2194 if ((attr->ia_valid & ATTR_SIZE) &&
2195 ceph_quota_is_max_bytes_exceeded(inode, attr->ia_size))
2196 return -EDQUOT;
2197
2198 err = __ceph_setattr(inode, attr);
2199
2200 if (err >= 0 && (attr->ia_valid & ATTR_MODE))
2201 err = posix_acl_chmod(inode, attr->ia_mode);
2202
2203 return err;
2204 }
2205
2206 /*
2207 * Verify that we have a lease on the given mask. If not,
2208 * do a getattr against an mds.
2209 */
__ceph_do_getattr(struct inode * inode,struct page * locked_page,int mask,bool force)2210 int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2211 int mask, bool force)
2212 {
2213 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2214 struct ceph_mds_client *mdsc = fsc->mdsc;
2215 struct ceph_mds_request *req;
2216 int mode;
2217 int err;
2218
2219 if (ceph_snap(inode) == CEPH_SNAPDIR) {
2220 dout("do_getattr inode %p SNAPDIR\n", inode);
2221 return 0;
2222 }
2223
2224 dout("do_getattr inode %p mask %s mode 0%o\n",
2225 inode, ceph_cap_string(mask), inode->i_mode);
2226 if (!force && ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
2227 return 0;
2228
2229 mode = (mask & CEPH_STAT_RSTAT) ? USE_AUTH_MDS : USE_ANY_MDS;
2230 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
2231 if (IS_ERR(req))
2232 return PTR_ERR(req);
2233 req->r_inode = inode;
2234 ihold(inode);
2235 req->r_num_caps = 1;
2236 req->r_args.getattr.mask = cpu_to_le32(mask);
2237 req->r_locked_page = locked_page;
2238 err = ceph_mdsc_do_request(mdsc, NULL, req);
2239 if (locked_page && err == 0) {
2240 u64 inline_version = req->r_reply_info.targeti.inline_version;
2241 if (inline_version == 0) {
2242 /* the reply is supposed to contain inline data */
2243 err = -EINVAL;
2244 } else if (inline_version == CEPH_INLINE_NONE) {
2245 err = -ENODATA;
2246 } else {
2247 err = req->r_reply_info.targeti.inline_len;
2248 }
2249 }
2250 ceph_mdsc_put_request(req);
2251 dout("do_getattr result=%d\n", err);
2252 return err;
2253 }
2254
2255
2256 /*
2257 * Check inode permissions. We verify we have a valid value for
2258 * the AUTH cap, then call the generic handler.
2259 */
ceph_permission(struct inode * inode,int mask)2260 int ceph_permission(struct inode *inode, int mask)
2261 {
2262 int err;
2263
2264 if (mask & MAY_NOT_BLOCK)
2265 return -ECHILD;
2266
2267 err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
2268
2269 if (!err)
2270 err = generic_permission(inode, mask);
2271 return err;
2272 }
2273
2274 /*
2275 * Get all attributes. Hopefully somedata we'll have a statlite()
2276 * and can limit the fields we require to be accurate.
2277 */
ceph_getattr(const struct path * path,struct kstat * stat,u32 request_mask,unsigned int flags)2278 int ceph_getattr(const struct path *path, struct kstat *stat,
2279 u32 request_mask, unsigned int flags)
2280 {
2281 struct inode *inode = d_inode(path->dentry);
2282 struct ceph_inode_info *ci = ceph_inode(inode);
2283 int err;
2284
2285 err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL, false);
2286 if (!err) {
2287 generic_fillattr(inode, stat);
2288 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
2289 if (ceph_snap(inode) != CEPH_NOSNAP)
2290 stat->dev = ceph_snap(inode);
2291 else
2292 stat->dev = 0;
2293 if (S_ISDIR(inode->i_mode)) {
2294 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
2295 RBYTES))
2296 stat->size = ci->i_rbytes;
2297 else
2298 stat->size = ci->i_files + ci->i_subdirs;
2299 stat->blocks = 0;
2300 stat->blksize = 65536;
2301 /*
2302 * Some applications rely on the number of st_nlink
2303 * value on directories to be either 0 (if unlinked)
2304 * or 2 + number of subdirectories.
2305 */
2306 if (stat->nlink == 1)
2307 /* '.' + '..' + subdirs */
2308 stat->nlink = 1 + 1 + ci->i_subdirs;
2309 }
2310 }
2311 return err;
2312 }
2313