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 #include <linux/iversion.h>
17
18 #include "super.h"
19 #include "mds_client.h"
20 #include "cache.h"
21 #include <linux/ceph/decode.h>
22
23 /*
24 * Ceph inode operations
25 *
26 * Implement basic inode helpers (get, alloc) and inode ops (getattr,
27 * setattr, etc.), xattr helpers, and helpers for assimilating
28 * metadata returned by the MDS into our cache.
29 *
30 * Also define helpers for doing asynchronous writeback, invalidation,
31 * and truncation for the benefit of those who can't afford to block
32 * (typically because they are in the message handler path).
33 */
34
35 static const struct inode_operations ceph_symlink_iops;
36
37 static void ceph_inode_work(struct work_struct *work);
38
39 /*
40 * find or create an inode, given the ceph ino number
41 */
ceph_set_ino_cb(struct inode * inode,void * data)42 static int ceph_set_ino_cb(struct inode *inode, void *data)
43 {
44 struct ceph_inode_info *ci = ceph_inode(inode);
45 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
46
47 ci->i_vino = *(struct ceph_vino *)data;
48 inode->i_ino = ceph_vino_to_ino_t(ci->i_vino);
49 inode_set_iversion_raw(inode, 0);
50 percpu_counter_inc(&mdsc->metric.total_inodes);
51
52 return 0;
53 }
54
ceph_get_inode(struct super_block * sb,struct ceph_vino vino)55 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
56 {
57 struct inode *inode;
58
59 if (ceph_vino_is_reserved(vino))
60 return ERR_PTR(-EREMOTEIO);
61
62 inode = iget5_locked(sb, (unsigned long)vino.ino, ceph_ino_compare,
63 ceph_set_ino_cb, &vino);
64 if (!inode)
65 return ERR_PTR(-ENOMEM);
66
67 dout("get_inode on %llu=%llx.%llx got %p new %d\n", ceph_present_inode(inode),
68 ceph_vinop(inode), inode, !!(inode->i_state & I_NEW));
69 return inode;
70 }
71
72 /*
73 * get/constuct snapdir inode for a given directory
74 */
ceph_get_snapdir(struct inode * parent)75 struct inode *ceph_get_snapdir(struct inode *parent)
76 {
77 struct ceph_vino vino = {
78 .ino = ceph_ino(parent),
79 .snap = CEPH_SNAPDIR,
80 };
81 struct inode *inode = ceph_get_inode(parent->i_sb, vino);
82 struct ceph_inode_info *ci = ceph_inode(inode);
83
84 BUG_ON(!S_ISDIR(parent->i_mode));
85 if (IS_ERR(inode))
86 return inode;
87 inode->i_mode = parent->i_mode;
88 inode->i_uid = parent->i_uid;
89 inode->i_gid = parent->i_gid;
90 inode->i_mtime = parent->i_mtime;
91 inode->i_ctime = parent->i_ctime;
92 inode->i_atime = parent->i_atime;
93 ci->i_rbytes = 0;
94 ci->i_btime = ceph_inode(parent)->i_btime;
95
96 if (inode->i_state & I_NEW) {
97 inode->i_op = &ceph_snapdir_iops;
98 inode->i_fop = &ceph_snapdir_fops;
99 ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
100 unlock_new_inode(inode);
101 }
102
103 return inode;
104 }
105
106 const struct inode_operations ceph_file_iops = {
107 .permission = ceph_permission,
108 .setattr = ceph_setattr,
109 .getattr = ceph_getattr,
110 .listxattr = ceph_listxattr,
111 .get_acl = ceph_get_acl,
112 .set_acl = ceph_set_acl,
113 };
114
115
116 /*
117 * We use a 'frag tree' to keep track of the MDS's directory fragments
118 * for a given inode (usually there is just a single fragment). We
119 * need to know when a child frag is delegated to a new MDS, or when
120 * it is flagged as replicated, so we can direct our requests
121 * accordingly.
122 */
123
124 /*
125 * find/create a frag in the tree
126 */
__get_or_create_frag(struct ceph_inode_info * ci,u32 f)127 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
128 u32 f)
129 {
130 struct rb_node **p;
131 struct rb_node *parent = NULL;
132 struct ceph_inode_frag *frag;
133 int c;
134
135 p = &ci->i_fragtree.rb_node;
136 while (*p) {
137 parent = *p;
138 frag = rb_entry(parent, struct ceph_inode_frag, node);
139 c = ceph_frag_compare(f, frag->frag);
140 if (c < 0)
141 p = &(*p)->rb_left;
142 else if (c > 0)
143 p = &(*p)->rb_right;
144 else
145 return frag;
146 }
147
148 frag = kmalloc(sizeof(*frag), GFP_NOFS);
149 if (!frag)
150 return ERR_PTR(-ENOMEM);
151
152 frag->frag = f;
153 frag->split_by = 0;
154 frag->mds = -1;
155 frag->ndist = 0;
156
157 rb_link_node(&frag->node, parent, p);
158 rb_insert_color(&frag->node, &ci->i_fragtree);
159
160 dout("get_or_create_frag added %llx.%llx frag %x\n",
161 ceph_vinop(&ci->vfs_inode), f);
162 return frag;
163 }
164
165 /*
166 * find a specific frag @f
167 */
__ceph_find_frag(struct ceph_inode_info * ci,u32 f)168 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
169 {
170 struct rb_node *n = ci->i_fragtree.rb_node;
171
172 while (n) {
173 struct ceph_inode_frag *frag =
174 rb_entry(n, struct ceph_inode_frag, node);
175 int c = ceph_frag_compare(f, frag->frag);
176 if (c < 0)
177 n = n->rb_left;
178 else if (c > 0)
179 n = n->rb_right;
180 else
181 return frag;
182 }
183 return NULL;
184 }
185
186 /*
187 * Choose frag containing the given value @v. If @pfrag is
188 * specified, copy the frag delegation info to the caller if
189 * it is present.
190 */
__ceph_choose_frag(struct ceph_inode_info * ci,u32 v,struct ceph_inode_frag * pfrag,int * found)191 static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
192 struct ceph_inode_frag *pfrag, int *found)
193 {
194 u32 t = ceph_frag_make(0, 0);
195 struct ceph_inode_frag *frag;
196 unsigned nway, i;
197 u32 n;
198
199 if (found)
200 *found = 0;
201
202 while (1) {
203 WARN_ON(!ceph_frag_contains_value(t, v));
204 frag = __ceph_find_frag(ci, t);
205 if (!frag)
206 break; /* t is a leaf */
207 if (frag->split_by == 0) {
208 if (pfrag)
209 memcpy(pfrag, frag, sizeof(*pfrag));
210 if (found)
211 *found = 1;
212 break;
213 }
214
215 /* choose child */
216 nway = 1 << frag->split_by;
217 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
218 frag->split_by, nway);
219 for (i = 0; i < nway; i++) {
220 n = ceph_frag_make_child(t, frag->split_by, i);
221 if (ceph_frag_contains_value(n, v)) {
222 t = n;
223 break;
224 }
225 }
226 BUG_ON(i == nway);
227 }
228 dout("choose_frag(%x) = %x\n", v, t);
229
230 return t;
231 }
232
ceph_choose_frag(struct ceph_inode_info * ci,u32 v,struct ceph_inode_frag * pfrag,int * found)233 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
234 struct ceph_inode_frag *pfrag, int *found)
235 {
236 u32 ret;
237 mutex_lock(&ci->i_fragtree_mutex);
238 ret = __ceph_choose_frag(ci, v, pfrag, found);
239 mutex_unlock(&ci->i_fragtree_mutex);
240 return ret;
241 }
242
243 /*
244 * Process dirfrag (delegation) info from the mds. Include leaf
245 * fragment in tree ONLY if ndist > 0. Otherwise, only
246 * branches/splits are included in i_fragtree)
247 */
ceph_fill_dirfrag(struct inode * inode,struct ceph_mds_reply_dirfrag * dirinfo)248 static int ceph_fill_dirfrag(struct inode *inode,
249 struct ceph_mds_reply_dirfrag *dirinfo)
250 {
251 struct ceph_inode_info *ci = ceph_inode(inode);
252 struct ceph_inode_frag *frag;
253 u32 id = le32_to_cpu(dirinfo->frag);
254 int mds = le32_to_cpu(dirinfo->auth);
255 int ndist = le32_to_cpu(dirinfo->ndist);
256 int diri_auth = -1;
257 int i;
258 int err = 0;
259
260 spin_lock(&ci->i_ceph_lock);
261 if (ci->i_auth_cap)
262 diri_auth = ci->i_auth_cap->mds;
263 spin_unlock(&ci->i_ceph_lock);
264
265 if (mds == -1) /* CDIR_AUTH_PARENT */
266 mds = diri_auth;
267
268 mutex_lock(&ci->i_fragtree_mutex);
269 if (ndist == 0 && mds == diri_auth) {
270 /* no delegation info needed. */
271 frag = __ceph_find_frag(ci, id);
272 if (!frag)
273 goto out;
274 if (frag->split_by == 0) {
275 /* tree leaf, remove */
276 dout("fill_dirfrag removed %llx.%llx frag %x"
277 " (no ref)\n", ceph_vinop(inode), id);
278 rb_erase(&frag->node, &ci->i_fragtree);
279 kfree(frag);
280 } else {
281 /* tree branch, keep and clear */
282 dout("fill_dirfrag cleared %llx.%llx frag %x"
283 " referral\n", ceph_vinop(inode), id);
284 frag->mds = -1;
285 frag->ndist = 0;
286 }
287 goto out;
288 }
289
290
291 /* find/add this frag to store mds delegation info */
292 frag = __get_or_create_frag(ci, id);
293 if (IS_ERR(frag)) {
294 /* this is not the end of the world; we can continue
295 with bad/inaccurate delegation info */
296 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
297 ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
298 err = -ENOMEM;
299 goto out;
300 }
301
302 frag->mds = mds;
303 frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
304 for (i = 0; i < frag->ndist; i++)
305 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
306 dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
307 ceph_vinop(inode), frag->frag, frag->ndist);
308
309 out:
310 mutex_unlock(&ci->i_fragtree_mutex);
311 return err;
312 }
313
frag_tree_split_cmp(const void * l,const void * r)314 static int frag_tree_split_cmp(const void *l, const void *r)
315 {
316 struct ceph_frag_tree_split *ls = (struct ceph_frag_tree_split*)l;
317 struct ceph_frag_tree_split *rs = (struct ceph_frag_tree_split*)r;
318 return ceph_frag_compare(le32_to_cpu(ls->frag),
319 le32_to_cpu(rs->frag));
320 }
321
is_frag_child(u32 f,struct ceph_inode_frag * frag)322 static bool is_frag_child(u32 f, struct ceph_inode_frag *frag)
323 {
324 if (!frag)
325 return f == ceph_frag_make(0, 0);
326 if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by)
327 return false;
328 return ceph_frag_contains_value(frag->frag, ceph_frag_value(f));
329 }
330
ceph_fill_fragtree(struct inode * inode,struct ceph_frag_tree_head * fragtree,struct ceph_mds_reply_dirfrag * dirinfo)331 static int ceph_fill_fragtree(struct inode *inode,
332 struct ceph_frag_tree_head *fragtree,
333 struct ceph_mds_reply_dirfrag *dirinfo)
334 {
335 struct ceph_inode_info *ci = ceph_inode(inode);
336 struct ceph_inode_frag *frag, *prev_frag = NULL;
337 struct rb_node *rb_node;
338 unsigned i, split_by, nsplits;
339 u32 id;
340 bool update = false;
341
342 mutex_lock(&ci->i_fragtree_mutex);
343 nsplits = le32_to_cpu(fragtree->nsplits);
344 if (nsplits != ci->i_fragtree_nsplits) {
345 update = true;
346 } else if (nsplits) {
347 i = prandom_u32() % nsplits;
348 id = le32_to_cpu(fragtree->splits[i].frag);
349 if (!__ceph_find_frag(ci, id))
350 update = true;
351 } else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) {
352 rb_node = rb_first(&ci->i_fragtree);
353 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
354 if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node))
355 update = true;
356 }
357 if (!update && dirinfo) {
358 id = le32_to_cpu(dirinfo->frag);
359 if (id != __ceph_choose_frag(ci, id, NULL, NULL))
360 update = true;
361 }
362 if (!update)
363 goto out_unlock;
364
365 if (nsplits > 1) {
366 sort(fragtree->splits, nsplits, sizeof(fragtree->splits[0]),
367 frag_tree_split_cmp, NULL);
368 }
369
370 dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode));
371 rb_node = rb_first(&ci->i_fragtree);
372 for (i = 0; i < nsplits; i++) {
373 id = le32_to_cpu(fragtree->splits[i].frag);
374 split_by = le32_to_cpu(fragtree->splits[i].by);
375 if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) {
376 pr_err("fill_fragtree %llx.%llx invalid split %d/%u, "
377 "frag %x split by %d\n", ceph_vinop(inode),
378 i, nsplits, id, split_by);
379 continue;
380 }
381 frag = NULL;
382 while (rb_node) {
383 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
384 if (ceph_frag_compare(frag->frag, id) >= 0) {
385 if (frag->frag != id)
386 frag = NULL;
387 else
388 rb_node = rb_next(rb_node);
389 break;
390 }
391 rb_node = rb_next(rb_node);
392 /* delete stale split/leaf node */
393 if (frag->split_by > 0 ||
394 !is_frag_child(frag->frag, prev_frag)) {
395 rb_erase(&frag->node, &ci->i_fragtree);
396 if (frag->split_by > 0)
397 ci->i_fragtree_nsplits--;
398 kfree(frag);
399 }
400 frag = NULL;
401 }
402 if (!frag) {
403 frag = __get_or_create_frag(ci, id);
404 if (IS_ERR(frag))
405 continue;
406 }
407 if (frag->split_by == 0)
408 ci->i_fragtree_nsplits++;
409 frag->split_by = split_by;
410 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
411 prev_frag = frag;
412 }
413 while (rb_node) {
414 frag = rb_entry(rb_node, struct ceph_inode_frag, node);
415 rb_node = rb_next(rb_node);
416 /* delete stale split/leaf node */
417 if (frag->split_by > 0 ||
418 !is_frag_child(frag->frag, prev_frag)) {
419 rb_erase(&frag->node, &ci->i_fragtree);
420 if (frag->split_by > 0)
421 ci->i_fragtree_nsplits--;
422 kfree(frag);
423 }
424 }
425 out_unlock:
426 mutex_unlock(&ci->i_fragtree_mutex);
427 return 0;
428 }
429
430 /*
431 * initialize a newly allocated inode.
432 */
ceph_alloc_inode(struct super_block * sb)433 struct inode *ceph_alloc_inode(struct super_block *sb)
434 {
435 struct ceph_inode_info *ci;
436 int i;
437
438 ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
439 if (!ci)
440 return NULL;
441
442 dout("alloc_inode %p\n", &ci->vfs_inode);
443
444 spin_lock_init(&ci->i_ceph_lock);
445
446 ci->i_version = 0;
447 ci->i_inline_version = 0;
448 ci->i_time_warp_seq = 0;
449 ci->i_ceph_flags = 0;
450 atomic64_set(&ci->i_ordered_count, 1);
451 atomic64_set(&ci->i_release_count, 1);
452 atomic64_set(&ci->i_complete_seq[0], 0);
453 atomic64_set(&ci->i_complete_seq[1], 0);
454 ci->i_symlink = NULL;
455
456 ci->i_max_bytes = 0;
457 ci->i_max_files = 0;
458
459 memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
460 memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
461 RCU_INIT_POINTER(ci->i_layout.pool_ns, NULL);
462
463 ci->i_fragtree = RB_ROOT;
464 mutex_init(&ci->i_fragtree_mutex);
465
466 ci->i_xattrs.blob = NULL;
467 ci->i_xattrs.prealloc_blob = NULL;
468 ci->i_xattrs.dirty = false;
469 ci->i_xattrs.index = RB_ROOT;
470 ci->i_xattrs.count = 0;
471 ci->i_xattrs.names_size = 0;
472 ci->i_xattrs.vals_size = 0;
473 ci->i_xattrs.version = 0;
474 ci->i_xattrs.index_version = 0;
475
476 ci->i_caps = RB_ROOT;
477 ci->i_auth_cap = NULL;
478 ci->i_dirty_caps = 0;
479 ci->i_flushing_caps = 0;
480 INIT_LIST_HEAD(&ci->i_dirty_item);
481 INIT_LIST_HEAD(&ci->i_flushing_item);
482 ci->i_prealloc_cap_flush = NULL;
483 INIT_LIST_HEAD(&ci->i_cap_flush_list);
484 init_waitqueue_head(&ci->i_cap_wq);
485 ci->i_hold_caps_max = 0;
486 INIT_LIST_HEAD(&ci->i_cap_delay_list);
487 INIT_LIST_HEAD(&ci->i_cap_snaps);
488 ci->i_head_snapc = NULL;
489 ci->i_snap_caps = 0;
490
491 ci->i_last_rd = ci->i_last_wr = jiffies - 3600 * HZ;
492 for (i = 0; i < CEPH_FILE_MODE_BITS; i++)
493 ci->i_nr_by_mode[i] = 0;
494
495 mutex_init(&ci->i_truncate_mutex);
496 ci->i_truncate_seq = 0;
497 ci->i_truncate_size = 0;
498 ci->i_truncate_pending = 0;
499
500 ci->i_max_size = 0;
501 ci->i_reported_size = 0;
502 ci->i_wanted_max_size = 0;
503 ci->i_requested_max_size = 0;
504
505 ci->i_pin_ref = 0;
506 ci->i_rd_ref = 0;
507 ci->i_rdcache_ref = 0;
508 ci->i_wr_ref = 0;
509 ci->i_wb_ref = 0;
510 ci->i_fx_ref = 0;
511 ci->i_wrbuffer_ref = 0;
512 ci->i_wrbuffer_ref_head = 0;
513 atomic_set(&ci->i_filelock_ref, 0);
514 atomic_set(&ci->i_shared_gen, 1);
515 ci->i_rdcache_gen = 0;
516 ci->i_rdcache_revoking = 0;
517
518 INIT_LIST_HEAD(&ci->i_unsafe_dirops);
519 INIT_LIST_HEAD(&ci->i_unsafe_iops);
520 spin_lock_init(&ci->i_unsafe_lock);
521
522 ci->i_snap_realm = NULL;
523 INIT_LIST_HEAD(&ci->i_snap_realm_item);
524 INIT_LIST_HEAD(&ci->i_snap_flush_item);
525
526 INIT_WORK(&ci->i_work, ceph_inode_work);
527 ci->i_work_mask = 0;
528 memset(&ci->i_btime, '\0', sizeof(ci->i_btime));
529
530 ceph_fscache_inode_init(ci);
531
532 return &ci->vfs_inode;
533 }
534
ceph_free_inode(struct inode * inode)535 void ceph_free_inode(struct inode *inode)
536 {
537 struct ceph_inode_info *ci = ceph_inode(inode);
538
539 kfree(ci->i_symlink);
540 kmem_cache_free(ceph_inode_cachep, ci);
541 }
542
ceph_evict_inode(struct inode * inode)543 void ceph_evict_inode(struct inode *inode)
544 {
545 struct ceph_inode_info *ci = ceph_inode(inode);
546 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
547 struct ceph_inode_frag *frag;
548 struct rb_node *n;
549
550 dout("evict_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
551
552 percpu_counter_dec(&mdsc->metric.total_inodes);
553
554 truncate_inode_pages_final(&inode->i_data);
555 clear_inode(inode);
556
557 ceph_fscache_unregister_inode_cookie(ci);
558
559 __ceph_remove_caps(ci);
560
561 if (__ceph_has_any_quota(ci))
562 ceph_adjust_quota_realms_count(inode, false);
563
564 /*
565 * we may still have a snap_realm reference if there are stray
566 * caps in i_snap_caps.
567 */
568 if (ci->i_snap_realm) {
569 if (ceph_snap(inode) == CEPH_NOSNAP) {
570 struct ceph_snap_realm *realm = ci->i_snap_realm;
571 dout(" dropping residual ref to snap realm %p\n",
572 realm);
573 spin_lock(&realm->inodes_with_caps_lock);
574 list_del_init(&ci->i_snap_realm_item);
575 ci->i_snap_realm = NULL;
576 if (realm->ino == ci->i_vino.ino)
577 realm->inode = NULL;
578 spin_unlock(&realm->inodes_with_caps_lock);
579 ceph_put_snap_realm(mdsc, realm);
580 } else {
581 ceph_put_snapid_map(mdsc, ci->i_snapid_map);
582 ci->i_snap_realm = NULL;
583 }
584 }
585
586 while ((n = rb_first(&ci->i_fragtree)) != NULL) {
587 frag = rb_entry(n, struct ceph_inode_frag, node);
588 rb_erase(n, &ci->i_fragtree);
589 kfree(frag);
590 }
591 ci->i_fragtree_nsplits = 0;
592
593 __ceph_destroy_xattrs(ci);
594 if (ci->i_xattrs.blob)
595 ceph_buffer_put(ci->i_xattrs.blob);
596 if (ci->i_xattrs.prealloc_blob)
597 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
598
599 ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns));
600 ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
601 }
602
calc_inode_blocks(u64 size)603 static inline blkcnt_t calc_inode_blocks(u64 size)
604 {
605 return (size + (1<<9) - 1) >> 9;
606 }
607
608 /*
609 * Helpers to fill in size, ctime, mtime, and atime. We have to be
610 * careful because either the client or MDS may have more up to date
611 * info, depending on which capabilities are held, and whether
612 * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime
613 * and size are monotonically increasing, except when utimes() or
614 * truncate() increments the corresponding _seq values.)
615 */
ceph_fill_file_size(struct inode * inode,int issued,u32 truncate_seq,u64 truncate_size,u64 size)616 int ceph_fill_file_size(struct inode *inode, int issued,
617 u32 truncate_seq, u64 truncate_size, u64 size)
618 {
619 struct ceph_inode_info *ci = ceph_inode(inode);
620 int queue_trunc = 0;
621
622 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
623 (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
624 dout("size %lld -> %llu\n", inode->i_size, size);
625 if (size > 0 && S_ISDIR(inode->i_mode)) {
626 pr_err("fill_file_size non-zero size for directory\n");
627 size = 0;
628 }
629 i_size_write(inode, size);
630 inode->i_blocks = calc_inode_blocks(size);
631 ci->i_reported_size = size;
632 if (truncate_seq != ci->i_truncate_seq) {
633 dout("truncate_seq %u -> %u\n",
634 ci->i_truncate_seq, truncate_seq);
635 ci->i_truncate_seq = truncate_seq;
636
637 /* the MDS should have revoked these caps */
638 WARN_ON_ONCE(issued & (CEPH_CAP_FILE_RD |
639 CEPH_CAP_FILE_LAZYIO));
640 /*
641 * If we hold relevant caps, or in the case where we're
642 * not the only client referencing this file and we
643 * don't hold those caps, then we need to check whether
644 * the file is either opened or mmaped
645 */
646 if ((issued & (CEPH_CAP_FILE_CACHE|
647 CEPH_CAP_FILE_BUFFER)) ||
648 mapping_mapped(inode->i_mapping) ||
649 __ceph_is_file_opened(ci)) {
650 ci->i_truncate_pending++;
651 queue_trunc = 1;
652 }
653 }
654 }
655 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
656 ci->i_truncate_size != truncate_size) {
657 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
658 truncate_size);
659 ci->i_truncate_size = truncate_size;
660 }
661
662 if (queue_trunc)
663 ceph_fscache_invalidate(inode);
664
665 return queue_trunc;
666 }
667
ceph_fill_file_time(struct inode * inode,int issued,u64 time_warp_seq,struct timespec64 * ctime,struct timespec64 * mtime,struct timespec64 * atime)668 void ceph_fill_file_time(struct inode *inode, int issued,
669 u64 time_warp_seq, struct timespec64 *ctime,
670 struct timespec64 *mtime, struct timespec64 *atime)
671 {
672 struct ceph_inode_info *ci = ceph_inode(inode);
673 int warn = 0;
674
675 if (issued & (CEPH_CAP_FILE_EXCL|
676 CEPH_CAP_FILE_WR|
677 CEPH_CAP_FILE_BUFFER|
678 CEPH_CAP_AUTH_EXCL|
679 CEPH_CAP_XATTR_EXCL)) {
680 if (ci->i_version == 0 ||
681 timespec64_compare(ctime, &inode->i_ctime) > 0) {
682 dout("ctime %lld.%09ld -> %lld.%09ld inc w/ cap\n",
683 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
684 ctime->tv_sec, ctime->tv_nsec);
685 inode->i_ctime = *ctime;
686 }
687 if (ci->i_version == 0 ||
688 ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
689 /* the MDS did a utimes() */
690 dout("mtime %lld.%09ld -> %lld.%09ld "
691 "tw %d -> %d\n",
692 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
693 mtime->tv_sec, mtime->tv_nsec,
694 ci->i_time_warp_seq, (int)time_warp_seq);
695
696 inode->i_mtime = *mtime;
697 inode->i_atime = *atime;
698 ci->i_time_warp_seq = time_warp_seq;
699 } else if (time_warp_seq == ci->i_time_warp_seq) {
700 /* nobody did utimes(); take the max */
701 if (timespec64_compare(mtime, &inode->i_mtime) > 0) {
702 dout("mtime %lld.%09ld -> %lld.%09ld inc\n",
703 inode->i_mtime.tv_sec,
704 inode->i_mtime.tv_nsec,
705 mtime->tv_sec, mtime->tv_nsec);
706 inode->i_mtime = *mtime;
707 }
708 if (timespec64_compare(atime, &inode->i_atime) > 0) {
709 dout("atime %lld.%09ld -> %lld.%09ld inc\n",
710 inode->i_atime.tv_sec,
711 inode->i_atime.tv_nsec,
712 atime->tv_sec, atime->tv_nsec);
713 inode->i_atime = *atime;
714 }
715 } else if (issued & CEPH_CAP_FILE_EXCL) {
716 /* we did a utimes(); ignore mds values */
717 } else {
718 warn = 1;
719 }
720 } else {
721 /* we have no write|excl caps; whatever the MDS says is true */
722 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
723 inode->i_ctime = *ctime;
724 inode->i_mtime = *mtime;
725 inode->i_atime = *atime;
726 ci->i_time_warp_seq = time_warp_seq;
727 } else {
728 warn = 1;
729 }
730 }
731 if (warn) /* time_warp_seq shouldn't go backwards */
732 dout("%p mds time_warp_seq %llu < %u\n",
733 inode, time_warp_seq, ci->i_time_warp_seq);
734 }
735
736 /*
737 * Populate an inode based on info from mds. May be called on new or
738 * existing inodes.
739 */
ceph_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,int cap_fmode,struct ceph_cap_reservation * caps_reservation)740 int ceph_fill_inode(struct inode *inode, struct page *locked_page,
741 struct ceph_mds_reply_info_in *iinfo,
742 struct ceph_mds_reply_dirfrag *dirinfo,
743 struct ceph_mds_session *session, int cap_fmode,
744 struct ceph_cap_reservation *caps_reservation)
745 {
746 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
747 struct ceph_mds_reply_inode *info = iinfo->in;
748 struct ceph_inode_info *ci = ceph_inode(inode);
749 int issued, new_issued, info_caps;
750 struct timespec64 mtime, atime, ctime;
751 struct ceph_buffer *xattr_blob = NULL;
752 struct ceph_buffer *old_blob = NULL;
753 struct ceph_string *pool_ns = NULL;
754 struct ceph_cap *new_cap = NULL;
755 int err = 0;
756 bool wake = false;
757 bool queue_trunc = false;
758 bool new_version = false;
759 bool fill_inline = false;
760
761 lockdep_assert_held(&mdsc->snap_rwsem);
762
763 dout("%s %p ino %llx.%llx v %llu had %llu\n", __func__,
764 inode, ceph_vinop(inode), le64_to_cpu(info->version),
765 ci->i_version);
766
767 info_caps = le32_to_cpu(info->cap.caps);
768
769 /* prealloc new cap struct */
770 if (info_caps && ceph_snap(inode) == CEPH_NOSNAP) {
771 new_cap = ceph_get_cap(mdsc, caps_reservation);
772 if (!new_cap)
773 return -ENOMEM;
774 }
775
776 /*
777 * prealloc xattr data, if it looks like we'll need it. only
778 * if len > 4 (meaning there are actually xattrs; the first 4
779 * bytes are the xattr count).
780 */
781 if (iinfo->xattr_len > 4) {
782 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
783 if (!xattr_blob)
784 pr_err("%s ENOMEM xattr blob %d bytes\n", __func__,
785 iinfo->xattr_len);
786 }
787
788 if (iinfo->pool_ns_len > 0)
789 pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data,
790 iinfo->pool_ns_len);
791
792 if (ceph_snap(inode) != CEPH_NOSNAP && !ci->i_snapid_map)
793 ci->i_snapid_map = ceph_get_snapid_map(mdsc, ceph_snap(inode));
794
795 spin_lock(&ci->i_ceph_lock);
796
797 /*
798 * provided version will be odd if inode value is projected,
799 * even if stable. skip the update if we have newer stable
800 * info (ours>=theirs, e.g. due to racing mds replies), unless
801 * we are getting projected (unstable) info (in which case the
802 * version is odd, and we want ours>theirs).
803 * us them
804 * 2 2 skip
805 * 3 2 skip
806 * 3 3 update
807 */
808 if (ci->i_version == 0 ||
809 ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
810 le64_to_cpu(info->version) > (ci->i_version & ~1)))
811 new_version = true;
812
813 /* Update change_attribute */
814 inode_set_max_iversion_raw(inode, iinfo->change_attr);
815
816 __ceph_caps_issued(ci, &issued);
817 issued |= __ceph_caps_dirty(ci);
818 new_issued = ~issued & info_caps;
819
820 /* update inode */
821 inode->i_rdev = le32_to_cpu(info->rdev);
822 /* directories have fl_stripe_unit set to zero */
823 if (le32_to_cpu(info->layout.fl_stripe_unit))
824 inode->i_blkbits =
825 fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
826 else
827 inode->i_blkbits = CEPH_BLOCK_SHIFT;
828
829 __ceph_update_quota(ci, iinfo->max_bytes, iinfo->max_files);
830
831 if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
832 (issued & CEPH_CAP_AUTH_EXCL) == 0) {
833 inode->i_mode = le32_to_cpu(info->mode);
834 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
835 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
836 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
837 from_kuid(&init_user_ns, inode->i_uid),
838 from_kgid(&init_user_ns, inode->i_gid));
839 ceph_decode_timespec64(&ci->i_btime, &iinfo->btime);
840 ceph_decode_timespec64(&ci->i_snap_btime, &iinfo->snap_btime);
841 }
842
843 if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
844 (issued & CEPH_CAP_LINK_EXCL) == 0)
845 set_nlink(inode, le32_to_cpu(info->nlink));
846
847 if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
848 /* be careful with mtime, atime, size */
849 ceph_decode_timespec64(&atime, &info->atime);
850 ceph_decode_timespec64(&mtime, &info->mtime);
851 ceph_decode_timespec64(&ctime, &info->ctime);
852 ceph_fill_file_time(inode, issued,
853 le32_to_cpu(info->time_warp_seq),
854 &ctime, &mtime, &atime);
855 }
856
857 if (new_version || (info_caps & CEPH_CAP_FILE_SHARED)) {
858 ci->i_files = le64_to_cpu(info->files);
859 ci->i_subdirs = le64_to_cpu(info->subdirs);
860 }
861
862 if (new_version ||
863 (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
864 s64 old_pool = ci->i_layout.pool_id;
865 struct ceph_string *old_ns;
866
867 ceph_file_layout_from_legacy(&ci->i_layout, &info->layout);
868 old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
869 lockdep_is_held(&ci->i_ceph_lock));
870 rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns);
871
872 if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns)
873 ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
874
875 pool_ns = old_ns;
876
877 queue_trunc = ceph_fill_file_size(inode, issued,
878 le32_to_cpu(info->truncate_seq),
879 le64_to_cpu(info->truncate_size),
880 le64_to_cpu(info->size));
881 /* only update max_size on auth cap */
882 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
883 ci->i_max_size != le64_to_cpu(info->max_size)) {
884 dout("max_size %lld -> %llu\n", ci->i_max_size,
885 le64_to_cpu(info->max_size));
886 ci->i_max_size = le64_to_cpu(info->max_size);
887 }
888 }
889
890 /* layout and rstat are not tracked by capability, update them if
891 * the inode info is from auth mds */
892 if (new_version || (info->cap.flags & CEPH_CAP_FLAG_AUTH)) {
893 if (S_ISDIR(inode->i_mode)) {
894 ci->i_dir_layout = iinfo->dir_layout;
895 ci->i_rbytes = le64_to_cpu(info->rbytes);
896 ci->i_rfiles = le64_to_cpu(info->rfiles);
897 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
898 ci->i_dir_pin = iinfo->dir_pin;
899 ceph_decode_timespec64(&ci->i_rctime, &info->rctime);
900 }
901 }
902
903 /* xattrs */
904 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
905 if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL)) &&
906 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
907 if (ci->i_xattrs.blob)
908 old_blob = ci->i_xattrs.blob;
909 ci->i_xattrs.blob = xattr_blob;
910 if (xattr_blob)
911 memcpy(ci->i_xattrs.blob->vec.iov_base,
912 iinfo->xattr_data, iinfo->xattr_len);
913 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
914 ceph_forget_all_cached_acls(inode);
915 ceph_security_invalidate_secctx(inode);
916 xattr_blob = NULL;
917 }
918
919 /* finally update i_version */
920 if (le64_to_cpu(info->version) > ci->i_version)
921 ci->i_version = le64_to_cpu(info->version);
922
923 inode->i_mapping->a_ops = &ceph_aops;
924
925 switch (inode->i_mode & S_IFMT) {
926 case S_IFIFO:
927 case S_IFBLK:
928 case S_IFCHR:
929 case S_IFSOCK:
930 inode->i_blkbits = PAGE_SHIFT;
931 init_special_inode(inode, inode->i_mode, inode->i_rdev);
932 inode->i_op = &ceph_file_iops;
933 break;
934 case S_IFREG:
935 inode->i_op = &ceph_file_iops;
936 inode->i_fop = &ceph_file_fops;
937 break;
938 case S_IFLNK:
939 inode->i_op = &ceph_symlink_iops;
940 if (!ci->i_symlink) {
941 u32 symlen = iinfo->symlink_len;
942 char *sym;
943
944 spin_unlock(&ci->i_ceph_lock);
945
946 if (symlen != i_size_read(inode)) {
947 pr_err("%s %llx.%llx BAD symlink "
948 "size %lld\n", __func__,
949 ceph_vinop(inode),
950 i_size_read(inode));
951 i_size_write(inode, symlen);
952 inode->i_blocks = calc_inode_blocks(symlen);
953 }
954
955 err = -ENOMEM;
956 sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
957 if (!sym)
958 goto out;
959
960 spin_lock(&ci->i_ceph_lock);
961 if (!ci->i_symlink)
962 ci->i_symlink = sym;
963 else
964 kfree(sym); /* lost a race */
965 }
966 inode->i_link = ci->i_symlink;
967 break;
968 case S_IFDIR:
969 inode->i_op = &ceph_dir_iops;
970 inode->i_fop = &ceph_dir_fops;
971 break;
972 default:
973 pr_err("%s %llx.%llx BAD mode 0%o\n", __func__,
974 ceph_vinop(inode), inode->i_mode);
975 }
976
977 /* were we issued a capability? */
978 if (info_caps) {
979 if (ceph_snap(inode) == CEPH_NOSNAP) {
980 ceph_add_cap(inode, session,
981 le64_to_cpu(info->cap.cap_id),
982 info_caps,
983 le32_to_cpu(info->cap.wanted),
984 le32_to_cpu(info->cap.seq),
985 le32_to_cpu(info->cap.mseq),
986 le64_to_cpu(info->cap.realm),
987 info->cap.flags, &new_cap);
988
989 /* set dir completion flag? */
990 if (S_ISDIR(inode->i_mode) &&
991 ci->i_files == 0 && ci->i_subdirs == 0 &&
992 (info_caps & CEPH_CAP_FILE_SHARED) &&
993 (issued & CEPH_CAP_FILE_EXCL) == 0 &&
994 !__ceph_dir_is_complete(ci)) {
995 dout(" marking %p complete (empty)\n", inode);
996 i_size_write(inode, 0);
997 __ceph_dir_set_complete(ci,
998 atomic64_read(&ci->i_release_count),
999 atomic64_read(&ci->i_ordered_count));
1000 }
1001
1002 wake = true;
1003 } else {
1004 dout(" %p got snap_caps %s\n", inode,
1005 ceph_cap_string(info_caps));
1006 ci->i_snap_caps |= info_caps;
1007 }
1008 }
1009
1010 if (iinfo->inline_version > 0 &&
1011 iinfo->inline_version >= ci->i_inline_version) {
1012 int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
1013 ci->i_inline_version = iinfo->inline_version;
1014 if (ci->i_inline_version != CEPH_INLINE_NONE &&
1015 (locked_page || (info_caps & cache_caps)))
1016 fill_inline = true;
1017 }
1018
1019 if (cap_fmode >= 0) {
1020 if (!info_caps)
1021 pr_warn("mds issued no caps on %llx.%llx\n",
1022 ceph_vinop(inode));
1023 __ceph_touch_fmode(ci, mdsc, cap_fmode);
1024 }
1025
1026 spin_unlock(&ci->i_ceph_lock);
1027
1028 if (fill_inline)
1029 ceph_fill_inline_data(inode, locked_page,
1030 iinfo->inline_data, iinfo->inline_len);
1031
1032 if (wake)
1033 wake_up_all(&ci->i_cap_wq);
1034
1035 /* queue truncate if we saw i_size decrease */
1036 if (queue_trunc)
1037 ceph_queue_vmtruncate(inode);
1038
1039 /* populate frag tree */
1040 if (S_ISDIR(inode->i_mode))
1041 ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
1042
1043 /* update delegation info? */
1044 if (dirinfo)
1045 ceph_fill_dirfrag(inode, dirinfo);
1046
1047 err = 0;
1048 out:
1049 if (new_cap)
1050 ceph_put_cap(mdsc, new_cap);
1051 ceph_buffer_put(old_blob);
1052 ceph_buffer_put(xattr_blob);
1053 ceph_put_string(pool_ns);
1054 return err;
1055 }
1056
1057 /*
1058 * caller should hold session s_mutex and dentry->d_lock.
1059 */
__update_dentry_lease(struct inode * dir,struct dentry * dentry,struct ceph_mds_reply_lease * lease,struct ceph_mds_session * session,unsigned long from_time,struct ceph_mds_session ** old_lease_session)1060 static void __update_dentry_lease(struct inode *dir, struct dentry *dentry,
1061 struct ceph_mds_reply_lease *lease,
1062 struct ceph_mds_session *session,
1063 unsigned long from_time,
1064 struct ceph_mds_session **old_lease_session)
1065 {
1066 struct ceph_dentry_info *di = ceph_dentry(dentry);
1067 unsigned mask = le16_to_cpu(lease->mask);
1068 long unsigned duration = le32_to_cpu(lease->duration_ms);
1069 long unsigned ttl = from_time + (duration * HZ) / 1000;
1070 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
1071
1072 dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
1073 dentry, duration, ttl);
1074
1075 /* only track leases on regular dentries */
1076 if (ceph_snap(dir) != CEPH_NOSNAP)
1077 return;
1078
1079 if (mask & CEPH_LEASE_PRIMARY_LINK)
1080 di->flags |= CEPH_DENTRY_PRIMARY_LINK;
1081 else
1082 di->flags &= ~CEPH_DENTRY_PRIMARY_LINK;
1083
1084 di->lease_shared_gen = atomic_read(&ceph_inode(dir)->i_shared_gen);
1085 if (!(mask & CEPH_LEASE_VALID)) {
1086 __ceph_dentry_dir_lease_touch(di);
1087 return;
1088 }
1089
1090 if (di->lease_gen == session->s_cap_gen &&
1091 time_before(ttl, di->time))
1092 return; /* we already have a newer lease. */
1093
1094 if (di->lease_session && di->lease_session != session) {
1095 *old_lease_session = di->lease_session;
1096 di->lease_session = NULL;
1097 }
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
1107 __ceph_dentry_lease_touch(di);
1108 }
1109
update_dentry_lease(struct inode * dir,struct dentry * dentry,struct ceph_mds_reply_lease * lease,struct ceph_mds_session * session,unsigned long from_time)1110 static inline void update_dentry_lease(struct inode *dir, struct dentry *dentry,
1111 struct ceph_mds_reply_lease *lease,
1112 struct ceph_mds_session *session,
1113 unsigned long from_time)
1114 {
1115 struct ceph_mds_session *old_lease_session = NULL;
1116 spin_lock(&dentry->d_lock);
1117 __update_dentry_lease(dir, dentry, lease, session, from_time,
1118 &old_lease_session);
1119 spin_unlock(&dentry->d_lock);
1120 ceph_put_mds_session(old_lease_session);
1121 }
1122
1123 /*
1124 * update dentry lease without having parent inode locked
1125 */
update_dentry_lease_careful(struct dentry * dentry,struct ceph_mds_reply_lease * lease,struct ceph_mds_session * session,unsigned long from_time,char * dname,u32 dname_len,struct ceph_vino * pdvino,struct ceph_vino * ptvino)1126 static void update_dentry_lease_careful(struct dentry *dentry,
1127 struct ceph_mds_reply_lease *lease,
1128 struct ceph_mds_session *session,
1129 unsigned long from_time,
1130 char *dname, u32 dname_len,
1131 struct ceph_vino *pdvino,
1132 struct ceph_vino *ptvino)
1133
1134 {
1135 struct inode *dir;
1136 struct ceph_mds_session *old_lease_session = NULL;
1137
1138 spin_lock(&dentry->d_lock);
1139 /* make sure dentry's name matches target */
1140 if (dentry->d_name.len != dname_len ||
1141 memcmp(dentry->d_name.name, dname, dname_len))
1142 goto out_unlock;
1143
1144 dir = d_inode(dentry->d_parent);
1145 /* make sure parent matches dvino */
1146 if (!ceph_ino_compare(dir, pdvino))
1147 goto out_unlock;
1148
1149 /* make sure dentry's inode matches target. NULL ptvino means that
1150 * we expect a negative dentry */
1151 if (ptvino) {
1152 if (d_really_is_negative(dentry))
1153 goto out_unlock;
1154 if (!ceph_ino_compare(d_inode(dentry), ptvino))
1155 goto out_unlock;
1156 } else {
1157 if (d_really_is_positive(dentry))
1158 goto out_unlock;
1159 }
1160
1161 __update_dentry_lease(dir, dentry, lease, session,
1162 from_time, &old_lease_session);
1163 out_unlock:
1164 spin_unlock(&dentry->d_lock);
1165 ceph_put_mds_session(old_lease_session);
1166 }
1167
1168 /*
1169 * splice a dentry to an inode.
1170 * caller must hold directory i_mutex for this to be safe.
1171 */
splice_dentry(struct dentry ** pdn,struct inode * in)1172 static int splice_dentry(struct dentry **pdn, struct inode *in)
1173 {
1174 struct dentry *dn = *pdn;
1175 struct dentry *realdn;
1176
1177 BUG_ON(d_inode(dn));
1178
1179 if (S_ISDIR(in->i_mode)) {
1180 /* If inode is directory, d_splice_alias() below will remove
1181 * 'realdn' from its origin parent. We need to ensure that
1182 * origin parent's readdir cache will not reference 'realdn'
1183 */
1184 realdn = d_find_any_alias(in);
1185 if (realdn) {
1186 struct ceph_dentry_info *di = ceph_dentry(realdn);
1187 spin_lock(&realdn->d_lock);
1188
1189 realdn->d_op->d_prune(realdn);
1190
1191 di->time = jiffies;
1192 di->lease_shared_gen = 0;
1193 di->offset = 0;
1194
1195 spin_unlock(&realdn->d_lock);
1196 dput(realdn);
1197 }
1198 }
1199
1200 /* dn must be unhashed */
1201 if (!d_unhashed(dn))
1202 d_drop(dn);
1203 realdn = d_splice_alias(in, dn);
1204 if (IS_ERR(realdn)) {
1205 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
1206 PTR_ERR(realdn), dn, in, ceph_vinop(in));
1207 return PTR_ERR(realdn);
1208 }
1209
1210 if (realdn) {
1211 dout("dn %p (%d) spliced with %p (%d) "
1212 "inode %p ino %llx.%llx\n",
1213 dn, d_count(dn),
1214 realdn, d_count(realdn),
1215 d_inode(realdn), ceph_vinop(d_inode(realdn)));
1216 dput(dn);
1217 *pdn = realdn;
1218 } else {
1219 BUG_ON(!ceph_dentry(dn));
1220 dout("dn %p attached to %p ino %llx.%llx\n",
1221 dn, d_inode(dn), ceph_vinop(d_inode(dn)));
1222 }
1223 return 0;
1224 }
1225
1226 /*
1227 * Incorporate results into the local cache. This is either just
1228 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
1229 * after a lookup).
1230 *
1231 * A reply may contain
1232 * a directory inode along with a dentry.
1233 * and/or a target inode
1234 *
1235 * Called with snap_rwsem (read).
1236 */
ceph_fill_trace(struct super_block * sb,struct ceph_mds_request * req)1237 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
1238 {
1239 struct ceph_mds_session *session = req->r_session;
1240 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1241 struct inode *in = NULL;
1242 struct ceph_vino tvino, dvino;
1243 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
1244 int err = 0;
1245
1246 dout("fill_trace %p is_dentry %d is_target %d\n", req,
1247 rinfo->head->is_dentry, rinfo->head->is_target);
1248
1249 if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
1250 dout("fill_trace reply is empty!\n");
1251 if (rinfo->head->result == 0 && req->r_parent)
1252 ceph_invalidate_dir_request(req);
1253 return 0;
1254 }
1255
1256 if (rinfo->head->is_dentry) {
1257 struct inode *dir = req->r_parent;
1258
1259 if (dir) {
1260 err = ceph_fill_inode(dir, NULL, &rinfo->diri,
1261 rinfo->dirfrag, session, -1,
1262 &req->r_caps_reservation);
1263 if (err < 0)
1264 goto done;
1265 } else {
1266 WARN_ON_ONCE(1);
1267 }
1268
1269 if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME &&
1270 test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1271 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1272 struct qstr dname;
1273 struct dentry *dn, *parent;
1274
1275 BUG_ON(!rinfo->head->is_target);
1276 BUG_ON(req->r_dentry);
1277
1278 parent = d_find_any_alias(dir);
1279 BUG_ON(!parent);
1280
1281 dname.name = rinfo->dname;
1282 dname.len = rinfo->dname_len;
1283 dname.hash = full_name_hash(parent, dname.name, dname.len);
1284 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1285 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1286 retry_lookup:
1287 dn = d_lookup(parent, &dname);
1288 dout("d_lookup on parent=%p name=%.*s got %p\n",
1289 parent, dname.len, dname.name, dn);
1290
1291 if (!dn) {
1292 dn = d_alloc(parent, &dname);
1293 dout("d_alloc %p '%.*s' = %p\n", parent,
1294 dname.len, dname.name, dn);
1295 if (!dn) {
1296 dput(parent);
1297 err = -ENOMEM;
1298 goto done;
1299 }
1300 err = 0;
1301 } else if (d_really_is_positive(dn) &&
1302 (ceph_ino(d_inode(dn)) != tvino.ino ||
1303 ceph_snap(d_inode(dn)) != tvino.snap)) {
1304 dout(" dn %p points to wrong inode %p\n",
1305 dn, d_inode(dn));
1306 ceph_dir_clear_ordered(dir);
1307 d_delete(dn);
1308 dput(dn);
1309 goto retry_lookup;
1310 }
1311
1312 req->r_dentry = dn;
1313 dput(parent);
1314 }
1315 }
1316
1317 if (rinfo->head->is_target) {
1318 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1319 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1320
1321 in = ceph_get_inode(sb, tvino);
1322 if (IS_ERR(in)) {
1323 err = PTR_ERR(in);
1324 goto done;
1325 }
1326
1327 err = ceph_fill_inode(in, req->r_locked_page, &rinfo->targeti,
1328 NULL, session,
1329 (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1330 !test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) &&
1331 rinfo->head->result == 0) ? req->r_fmode : -1,
1332 &req->r_caps_reservation);
1333 if (err < 0) {
1334 pr_err("ceph_fill_inode badness %p %llx.%llx\n",
1335 in, ceph_vinop(in));
1336 if (in->i_state & I_NEW)
1337 discard_new_inode(in);
1338 else
1339 iput(in);
1340 goto done;
1341 }
1342 req->r_target_inode = in;
1343 if (in->i_state & I_NEW)
1344 unlock_new_inode(in);
1345 }
1346
1347 /*
1348 * ignore null lease/binding on snapdir ENOENT, or else we
1349 * will have trouble splicing in the virtual snapdir later
1350 */
1351 if (rinfo->head->is_dentry &&
1352 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
1353 test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1354 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
1355 fsc->mount_options->snapdir_name,
1356 req->r_dentry->d_name.len))) {
1357 /*
1358 * lookup link rename : null -> possibly existing inode
1359 * mknod symlink mkdir : null -> new inode
1360 * unlink : linked -> null
1361 */
1362 struct inode *dir = req->r_parent;
1363 struct dentry *dn = req->r_dentry;
1364 bool have_dir_cap, have_lease;
1365
1366 BUG_ON(!dn);
1367 BUG_ON(!dir);
1368 BUG_ON(d_inode(dn->d_parent) != dir);
1369
1370 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1371 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1372
1373 BUG_ON(ceph_ino(dir) != dvino.ino);
1374 BUG_ON(ceph_snap(dir) != dvino.snap);
1375
1376 /* do we have a lease on the whole dir? */
1377 have_dir_cap =
1378 (le32_to_cpu(rinfo->diri.in->cap.caps) &
1379 CEPH_CAP_FILE_SHARED);
1380
1381 /* do we have a dn lease? */
1382 have_lease = have_dir_cap ||
1383 le32_to_cpu(rinfo->dlease->duration_ms);
1384 if (!have_lease)
1385 dout("fill_trace no dentry lease or dir cap\n");
1386
1387 /* rename? */
1388 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1389 struct inode *olddir = req->r_old_dentry_dir;
1390 BUG_ON(!olddir);
1391
1392 dout(" src %p '%pd' dst %p '%pd'\n",
1393 req->r_old_dentry,
1394 req->r_old_dentry,
1395 dn, dn);
1396 dout("fill_trace doing d_move %p -> %p\n",
1397 req->r_old_dentry, dn);
1398
1399 /* d_move screws up sibling dentries' offsets */
1400 ceph_dir_clear_ordered(dir);
1401 ceph_dir_clear_ordered(olddir);
1402
1403 d_move(req->r_old_dentry, dn);
1404 dout(" src %p '%pd' dst %p '%pd'\n",
1405 req->r_old_dentry,
1406 req->r_old_dentry,
1407 dn, dn);
1408
1409 /* ensure target dentry is invalidated, despite
1410 rehashing bug in vfs_rename_dir */
1411 ceph_invalidate_dentry_lease(dn);
1412
1413 dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1414 ceph_dentry(req->r_old_dentry)->offset);
1415
1416 /* swap r_dentry and r_old_dentry in case that
1417 * splice_dentry() gets called later. This is safe
1418 * because no other place will use them */
1419 req->r_dentry = req->r_old_dentry;
1420 req->r_old_dentry = dn;
1421 dn = req->r_dentry;
1422 }
1423
1424 /* null dentry? */
1425 if (!rinfo->head->is_target) {
1426 dout("fill_trace null dentry\n");
1427 if (d_really_is_positive(dn)) {
1428 dout("d_delete %p\n", dn);
1429 ceph_dir_clear_ordered(dir);
1430 d_delete(dn);
1431 } else if (have_lease) {
1432 if (d_unhashed(dn))
1433 d_add(dn, NULL);
1434 update_dentry_lease(dir, dn,
1435 rinfo->dlease, session,
1436 req->r_request_started);
1437 }
1438 goto done;
1439 }
1440
1441 /* attach proper inode */
1442 if (d_really_is_negative(dn)) {
1443 ceph_dir_clear_ordered(dir);
1444 ihold(in);
1445 err = splice_dentry(&req->r_dentry, in);
1446 if (err < 0)
1447 goto done;
1448 dn = req->r_dentry; /* may have spliced */
1449 } else if (d_really_is_positive(dn) && d_inode(dn) != in) {
1450 dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1451 dn, d_inode(dn), ceph_vinop(d_inode(dn)),
1452 ceph_vinop(in));
1453 d_invalidate(dn);
1454 have_lease = false;
1455 }
1456
1457 if (have_lease) {
1458 update_dentry_lease(dir, dn,
1459 rinfo->dlease, session,
1460 req->r_request_started);
1461 }
1462 dout(" final dn %p\n", dn);
1463 } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1464 req->r_op == CEPH_MDS_OP_MKSNAP) &&
1465 test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
1466 !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
1467 struct inode *dir = req->r_parent;
1468
1469 /* fill out a snapdir LOOKUPSNAP dentry */
1470 BUG_ON(!dir);
1471 BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
1472 BUG_ON(!req->r_dentry);
1473 dout(" linking snapped dir %p to dn %p\n", in, req->r_dentry);
1474 ceph_dir_clear_ordered(dir);
1475 ihold(in);
1476 err = splice_dentry(&req->r_dentry, in);
1477 if (err < 0)
1478 goto done;
1479 } else if (rinfo->head->is_dentry && req->r_dentry) {
1480 /* parent inode is not locked, be carefull */
1481 struct ceph_vino *ptvino = NULL;
1482 dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
1483 dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
1484 if (rinfo->head->is_target) {
1485 tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1486 tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1487 ptvino = &tvino;
1488 }
1489 update_dentry_lease_careful(req->r_dentry, rinfo->dlease,
1490 session, req->r_request_started,
1491 rinfo->dname, rinfo->dname_len,
1492 &dvino, ptvino);
1493 }
1494 done:
1495 dout("fill_trace done err=%d\n", err);
1496 return err;
1497 }
1498
1499 /*
1500 * Prepopulate our cache with readdir results, leases, etc.
1501 */
readdir_prepopulate_inodes_only(struct ceph_mds_request * req,struct ceph_mds_session * session)1502 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
1503 struct ceph_mds_session *session)
1504 {
1505 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1506 int i, err = 0;
1507
1508 for (i = 0; i < rinfo->dir_nr; i++) {
1509 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1510 struct ceph_vino vino;
1511 struct inode *in;
1512 int rc;
1513
1514 vino.ino = le64_to_cpu(rde->inode.in->ino);
1515 vino.snap = le64_to_cpu(rde->inode.in->snapid);
1516
1517 in = ceph_get_inode(req->r_dentry->d_sb, vino);
1518 if (IS_ERR(in)) {
1519 err = PTR_ERR(in);
1520 dout("new_inode badness got %d\n", err);
1521 continue;
1522 }
1523 rc = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
1524 -1, &req->r_caps_reservation);
1525 if (rc < 0) {
1526 pr_err("ceph_fill_inode badness on %p got %d\n",
1527 in, rc);
1528 err = rc;
1529 if (in->i_state & I_NEW) {
1530 ihold(in);
1531 discard_new_inode(in);
1532 }
1533 } else if (in->i_state & I_NEW) {
1534 unlock_new_inode(in);
1535 }
1536
1537 /* avoid calling iput_final() in mds dispatch threads */
1538 ceph_async_iput(in);
1539 }
1540
1541 return err;
1542 }
1543
ceph_readdir_cache_release(struct ceph_readdir_cache_control * ctl)1544 void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
1545 {
1546 if (ctl->page) {
1547 kunmap(ctl->page);
1548 put_page(ctl->page);
1549 ctl->page = NULL;
1550 }
1551 }
1552
fill_readdir_cache(struct inode * dir,struct dentry * dn,struct ceph_readdir_cache_control * ctl,struct ceph_mds_request * req)1553 static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
1554 struct ceph_readdir_cache_control *ctl,
1555 struct ceph_mds_request *req)
1556 {
1557 struct ceph_inode_info *ci = ceph_inode(dir);
1558 unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
1559 unsigned idx = ctl->index % nsize;
1560 pgoff_t pgoff = ctl->index / nsize;
1561
1562 if (!ctl->page || pgoff != page_index(ctl->page)) {
1563 ceph_readdir_cache_release(ctl);
1564 if (idx == 0)
1565 ctl->page = grab_cache_page(&dir->i_data, pgoff);
1566 else
1567 ctl->page = find_lock_page(&dir->i_data, pgoff);
1568 if (!ctl->page) {
1569 ctl->index = -1;
1570 return idx == 0 ? -ENOMEM : 0;
1571 }
1572 /* reading/filling the cache are serialized by
1573 * i_mutex, no need to use page lock */
1574 unlock_page(ctl->page);
1575 ctl->dentries = kmap(ctl->page);
1576 if (idx == 0)
1577 memset(ctl->dentries, 0, PAGE_SIZE);
1578 }
1579
1580 if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
1581 req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
1582 dout("readdir cache dn %p idx %d\n", dn, ctl->index);
1583 ctl->dentries[idx] = dn;
1584 ctl->index++;
1585 } else {
1586 dout("disable readdir cache\n");
1587 ctl->index = -1;
1588 }
1589 return 0;
1590 }
1591
ceph_readdir_prepopulate(struct ceph_mds_request * req,struct ceph_mds_session * session)1592 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1593 struct ceph_mds_session *session)
1594 {
1595 struct dentry *parent = req->r_dentry;
1596 struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
1597 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1598 struct qstr dname;
1599 struct dentry *dn;
1600 struct inode *in;
1601 int err = 0, skipped = 0, ret, i;
1602 struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1603 u32 frag = le32_to_cpu(rhead->args.readdir.frag);
1604 u32 last_hash = 0;
1605 u32 fpos_offset;
1606 struct ceph_readdir_cache_control cache_ctl = {};
1607
1608 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
1609 return readdir_prepopulate_inodes_only(req, session);
1610
1611 if (rinfo->hash_order) {
1612 if (req->r_path2) {
1613 last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1614 req->r_path2,
1615 strlen(req->r_path2));
1616 last_hash = ceph_frag_value(last_hash);
1617 } else if (rinfo->offset_hash) {
1618 /* mds understands offset_hash */
1619 WARN_ON_ONCE(req->r_readdir_offset != 2);
1620 last_hash = le32_to_cpu(rhead->args.readdir.offset_hash);
1621 }
1622 }
1623
1624 if (rinfo->dir_dir &&
1625 le32_to_cpu(rinfo->dir_dir->frag) != frag) {
1626 dout("readdir_prepopulate got new frag %x -> %x\n",
1627 frag, le32_to_cpu(rinfo->dir_dir->frag));
1628 frag = le32_to_cpu(rinfo->dir_dir->frag);
1629 if (!rinfo->hash_order)
1630 req->r_readdir_offset = 2;
1631 }
1632
1633 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1634 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1635 rinfo->dir_nr, parent);
1636 } else {
1637 dout("readdir_prepopulate %d items under dn %p\n",
1638 rinfo->dir_nr, parent);
1639 if (rinfo->dir_dir)
1640 ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
1641
1642 if (ceph_frag_is_leftmost(frag) &&
1643 req->r_readdir_offset == 2 &&
1644 !(rinfo->hash_order && last_hash)) {
1645 /* note dir version at start of readdir so we can
1646 * tell if any dentries get dropped */
1647 req->r_dir_release_cnt =
1648 atomic64_read(&ci->i_release_count);
1649 req->r_dir_ordered_cnt =
1650 atomic64_read(&ci->i_ordered_count);
1651 req->r_readdir_cache_idx = 0;
1652 }
1653 }
1654
1655 cache_ctl.index = req->r_readdir_cache_idx;
1656 fpos_offset = req->r_readdir_offset;
1657
1658 /* FIXME: release caps/leases if error occurs */
1659 for (i = 0; i < rinfo->dir_nr; i++) {
1660 struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
1661 struct ceph_vino tvino;
1662
1663 dname.name = rde->name;
1664 dname.len = rde->name_len;
1665 dname.hash = full_name_hash(parent, dname.name, dname.len);
1666
1667 tvino.ino = le64_to_cpu(rde->inode.in->ino);
1668 tvino.snap = le64_to_cpu(rde->inode.in->snapid);
1669
1670 if (rinfo->hash_order) {
1671 u32 hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
1672 rde->name, rde->name_len);
1673 hash = ceph_frag_value(hash);
1674 if (hash != last_hash)
1675 fpos_offset = 2;
1676 last_hash = hash;
1677 rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
1678 } else {
1679 rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
1680 }
1681
1682 retry_lookup:
1683 dn = d_lookup(parent, &dname);
1684 dout("d_lookup on parent=%p name=%.*s got %p\n",
1685 parent, dname.len, dname.name, dn);
1686
1687 if (!dn) {
1688 dn = d_alloc(parent, &dname);
1689 dout("d_alloc %p '%.*s' = %p\n", parent,
1690 dname.len, dname.name, dn);
1691 if (!dn) {
1692 dout("d_alloc badness\n");
1693 err = -ENOMEM;
1694 goto out;
1695 }
1696 } else if (d_really_is_positive(dn) &&
1697 (ceph_ino(d_inode(dn)) != tvino.ino ||
1698 ceph_snap(d_inode(dn)) != tvino.snap)) {
1699 struct ceph_dentry_info *di = ceph_dentry(dn);
1700 dout(" dn %p points to wrong inode %p\n",
1701 dn, d_inode(dn));
1702
1703 spin_lock(&dn->d_lock);
1704 if (di->offset > 0 &&
1705 di->lease_shared_gen ==
1706 atomic_read(&ci->i_shared_gen)) {
1707 __ceph_dir_clear_ordered(ci);
1708 di->offset = 0;
1709 }
1710 spin_unlock(&dn->d_lock);
1711
1712 d_delete(dn);
1713 dput(dn);
1714 goto retry_lookup;
1715 }
1716
1717 /* inode */
1718 if (d_really_is_positive(dn)) {
1719 in = d_inode(dn);
1720 } else {
1721 in = ceph_get_inode(parent->d_sb, tvino);
1722 if (IS_ERR(in)) {
1723 dout("new_inode badness\n");
1724 d_drop(dn);
1725 dput(dn);
1726 err = PTR_ERR(in);
1727 goto out;
1728 }
1729 }
1730
1731 ret = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
1732 -1, &req->r_caps_reservation);
1733 if (ret < 0) {
1734 pr_err("ceph_fill_inode badness on %p\n", in);
1735 if (d_really_is_negative(dn)) {
1736 /* avoid calling iput_final() in mds
1737 * dispatch threads */
1738 if (in->i_state & I_NEW) {
1739 ihold(in);
1740 discard_new_inode(in);
1741 }
1742 ceph_async_iput(in);
1743 }
1744 d_drop(dn);
1745 err = ret;
1746 goto next_item;
1747 }
1748 if (in->i_state & I_NEW)
1749 unlock_new_inode(in);
1750
1751 if (d_really_is_negative(dn)) {
1752 if (ceph_security_xattr_deadlock(in)) {
1753 dout(" skip splicing dn %p to inode %p"
1754 " (security xattr deadlock)\n", dn, in);
1755 ceph_async_iput(in);
1756 skipped++;
1757 goto next_item;
1758 }
1759
1760 err = splice_dentry(&dn, in);
1761 if (err < 0)
1762 goto next_item;
1763 }
1764
1765 ceph_dentry(dn)->offset = rde->offset;
1766
1767 update_dentry_lease(d_inode(parent), dn,
1768 rde->lease, req->r_session,
1769 req->r_request_started);
1770
1771 if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
1772 ret = fill_readdir_cache(d_inode(parent), dn,
1773 &cache_ctl, req);
1774 if (ret < 0)
1775 err = ret;
1776 }
1777 next_item:
1778 dput(dn);
1779 }
1780 out:
1781 if (err == 0 && skipped == 0) {
1782 set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
1783 req->r_readdir_cache_idx = cache_ctl.index;
1784 }
1785 ceph_readdir_cache_release(&cache_ctl);
1786 dout("readdir_prepopulate done\n");
1787 return err;
1788 }
1789
ceph_inode_set_size(struct inode * inode,loff_t size)1790 bool ceph_inode_set_size(struct inode *inode, loff_t size)
1791 {
1792 struct ceph_inode_info *ci = ceph_inode(inode);
1793 bool ret;
1794
1795 spin_lock(&ci->i_ceph_lock);
1796 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1797 i_size_write(inode, size);
1798 inode->i_blocks = calc_inode_blocks(size);
1799
1800 ret = __ceph_should_report_size(ci);
1801
1802 spin_unlock(&ci->i_ceph_lock);
1803 return ret;
1804 }
1805
1806 /*
1807 * Put reference to inode, but avoid calling iput_final() in current thread.
1808 * iput_final() may wait for reahahead pages. The wait can cause deadlock in
1809 * some contexts.
1810 */
ceph_async_iput(struct inode * inode)1811 void ceph_async_iput(struct inode *inode)
1812 {
1813 if (!inode)
1814 return;
1815 for (;;) {
1816 if (atomic_add_unless(&inode->i_count, -1, 1))
1817 break;
1818 if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1819 &ceph_inode(inode)->i_work))
1820 break;
1821 /* queue work failed, i_count must be at least 2 */
1822 }
1823 }
1824
1825 /*
1826 * Write back inode data in a worker thread. (This can't be done
1827 * in the message handler context.)
1828 */
ceph_queue_writeback(struct inode * inode)1829 void ceph_queue_writeback(struct inode *inode)
1830 {
1831 struct ceph_inode_info *ci = ceph_inode(inode);
1832 set_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask);
1833
1834 ihold(inode);
1835 if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1836 &ci->i_work)) {
1837 dout("ceph_queue_writeback %p\n", inode);
1838 } else {
1839 dout("ceph_queue_writeback %p already queued, mask=%lx\n",
1840 inode, ci->i_work_mask);
1841 iput(inode);
1842 }
1843 }
1844
1845 /*
1846 * queue an async invalidation
1847 */
ceph_queue_invalidate(struct inode * inode)1848 void ceph_queue_invalidate(struct inode *inode)
1849 {
1850 struct ceph_inode_info *ci = ceph_inode(inode);
1851 set_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask);
1852
1853 ihold(inode);
1854 if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1855 &ceph_inode(inode)->i_work)) {
1856 dout("ceph_queue_invalidate %p\n", inode);
1857 } else {
1858 dout("ceph_queue_invalidate %p already queued, mask=%lx\n",
1859 inode, ci->i_work_mask);
1860 iput(inode);
1861 }
1862 }
1863
1864 /*
1865 * Queue an async vmtruncate. If we fail to queue work, we will handle
1866 * the truncation the next time we call __ceph_do_pending_vmtruncate.
1867 */
ceph_queue_vmtruncate(struct inode * inode)1868 void ceph_queue_vmtruncate(struct inode *inode)
1869 {
1870 struct ceph_inode_info *ci = ceph_inode(inode);
1871 set_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask);
1872
1873 ihold(inode);
1874 if (queue_work(ceph_inode_to_client(inode)->inode_wq,
1875 &ci->i_work)) {
1876 dout("ceph_queue_vmtruncate %p\n", inode);
1877 } else {
1878 dout("ceph_queue_vmtruncate %p already queued, mask=%lx\n",
1879 inode, ci->i_work_mask);
1880 iput(inode);
1881 }
1882 }
1883
ceph_do_invalidate_pages(struct inode * inode)1884 static void ceph_do_invalidate_pages(struct inode *inode)
1885 {
1886 struct ceph_inode_info *ci = ceph_inode(inode);
1887 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
1888 u32 orig_gen;
1889 int check = 0;
1890
1891 mutex_lock(&ci->i_truncate_mutex);
1892
1893 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
1894 pr_warn_ratelimited("invalidate_pages %p %lld forced umount\n",
1895 inode, ceph_ino(inode));
1896 mapping_set_error(inode->i_mapping, -EIO);
1897 truncate_pagecache(inode, 0);
1898 mutex_unlock(&ci->i_truncate_mutex);
1899 goto out;
1900 }
1901
1902 spin_lock(&ci->i_ceph_lock);
1903 dout("invalidate_pages %p gen %d revoking %d\n", inode,
1904 ci->i_rdcache_gen, ci->i_rdcache_revoking);
1905 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1906 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1907 check = 1;
1908 spin_unlock(&ci->i_ceph_lock);
1909 mutex_unlock(&ci->i_truncate_mutex);
1910 goto out;
1911 }
1912 orig_gen = ci->i_rdcache_gen;
1913 spin_unlock(&ci->i_ceph_lock);
1914
1915 ceph_fscache_invalidate(inode);
1916 if (invalidate_inode_pages2(inode->i_mapping) < 0) {
1917 pr_err("invalidate_pages %p fails\n", inode);
1918 }
1919
1920 spin_lock(&ci->i_ceph_lock);
1921 if (orig_gen == ci->i_rdcache_gen &&
1922 orig_gen == ci->i_rdcache_revoking) {
1923 dout("invalidate_pages %p gen %d successful\n", inode,
1924 ci->i_rdcache_gen);
1925 ci->i_rdcache_revoking--;
1926 check = 1;
1927 } else {
1928 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1929 inode, orig_gen, ci->i_rdcache_gen,
1930 ci->i_rdcache_revoking);
1931 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
1932 check = 1;
1933 }
1934 spin_unlock(&ci->i_ceph_lock);
1935 mutex_unlock(&ci->i_truncate_mutex);
1936 out:
1937 if (check)
1938 ceph_check_caps(ci, 0, NULL);
1939 }
1940
1941 /*
1942 * Make sure any pending truncation is applied before doing anything
1943 * that may depend on it.
1944 */
__ceph_do_pending_vmtruncate(struct inode * inode)1945 void __ceph_do_pending_vmtruncate(struct inode *inode)
1946 {
1947 struct ceph_inode_info *ci = ceph_inode(inode);
1948 u64 to;
1949 int wrbuffer_refs, finish = 0;
1950
1951 mutex_lock(&ci->i_truncate_mutex);
1952 retry:
1953 spin_lock(&ci->i_ceph_lock);
1954 if (ci->i_truncate_pending == 0) {
1955 dout("__do_pending_vmtruncate %p none pending\n", inode);
1956 spin_unlock(&ci->i_ceph_lock);
1957 mutex_unlock(&ci->i_truncate_mutex);
1958 return;
1959 }
1960
1961 /*
1962 * make sure any dirty snapped pages are flushed before we
1963 * possibly truncate them.. so write AND block!
1964 */
1965 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1966 spin_unlock(&ci->i_ceph_lock);
1967 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1968 inode);
1969 filemap_write_and_wait_range(&inode->i_data, 0,
1970 inode->i_sb->s_maxbytes);
1971 goto retry;
1972 }
1973
1974 /* there should be no reader or writer */
1975 WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
1976
1977 to = ci->i_truncate_size;
1978 wrbuffer_refs = ci->i_wrbuffer_ref;
1979 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1980 ci->i_truncate_pending, to);
1981 spin_unlock(&ci->i_ceph_lock);
1982
1983 truncate_pagecache(inode, to);
1984
1985 spin_lock(&ci->i_ceph_lock);
1986 if (to == ci->i_truncate_size) {
1987 ci->i_truncate_pending = 0;
1988 finish = 1;
1989 }
1990 spin_unlock(&ci->i_ceph_lock);
1991 if (!finish)
1992 goto retry;
1993
1994 mutex_unlock(&ci->i_truncate_mutex);
1995
1996 if (wrbuffer_refs == 0)
1997 ceph_check_caps(ci, 0, NULL);
1998
1999 wake_up_all(&ci->i_cap_wq);
2000 }
2001
ceph_inode_work(struct work_struct * work)2002 static void ceph_inode_work(struct work_struct *work)
2003 {
2004 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
2005 i_work);
2006 struct inode *inode = &ci->vfs_inode;
2007
2008 if (test_and_clear_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask)) {
2009 dout("writeback %p\n", inode);
2010 filemap_fdatawrite(&inode->i_data);
2011 }
2012 if (test_and_clear_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask))
2013 ceph_do_invalidate_pages(inode);
2014
2015 if (test_and_clear_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask))
2016 __ceph_do_pending_vmtruncate(inode);
2017
2018 iput(inode);
2019 }
2020
2021 /*
2022 * symlinks
2023 */
2024 static const struct inode_operations ceph_symlink_iops = {
2025 .get_link = simple_get_link,
2026 .setattr = ceph_setattr,
2027 .getattr = ceph_getattr,
2028 .listxattr = ceph_listxattr,
2029 };
2030
__ceph_setattr(struct inode * inode,struct iattr * attr)2031 int __ceph_setattr(struct inode *inode, struct iattr *attr)
2032 {
2033 struct ceph_inode_info *ci = ceph_inode(inode);
2034 unsigned int ia_valid = attr->ia_valid;
2035 struct ceph_mds_request *req;
2036 struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
2037 struct ceph_cap_flush *prealloc_cf;
2038 int issued;
2039 int release = 0, dirtied = 0;
2040 int mask = 0;
2041 int err = 0;
2042 int inode_dirty_flags = 0;
2043 bool lock_snap_rwsem = false;
2044
2045 prealloc_cf = ceph_alloc_cap_flush();
2046 if (!prealloc_cf)
2047 return -ENOMEM;
2048
2049 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
2050 USE_AUTH_MDS);
2051 if (IS_ERR(req)) {
2052 ceph_free_cap_flush(prealloc_cf);
2053 return PTR_ERR(req);
2054 }
2055
2056 spin_lock(&ci->i_ceph_lock);
2057 issued = __ceph_caps_issued(ci, NULL);
2058
2059 if (!ci->i_head_snapc &&
2060 (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
2061 lock_snap_rwsem = true;
2062 if (!down_read_trylock(&mdsc->snap_rwsem)) {
2063 spin_unlock(&ci->i_ceph_lock);
2064 down_read(&mdsc->snap_rwsem);
2065 spin_lock(&ci->i_ceph_lock);
2066 issued = __ceph_caps_issued(ci, NULL);
2067 }
2068 }
2069
2070 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
2071
2072 if (ia_valid & ATTR_UID) {
2073 dout("setattr %p uid %d -> %d\n", inode,
2074 from_kuid(&init_user_ns, inode->i_uid),
2075 from_kuid(&init_user_ns, attr->ia_uid));
2076 if (issued & CEPH_CAP_AUTH_EXCL) {
2077 inode->i_uid = attr->ia_uid;
2078 dirtied |= CEPH_CAP_AUTH_EXCL;
2079 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2080 !uid_eq(attr->ia_uid, inode->i_uid)) {
2081 req->r_args.setattr.uid = cpu_to_le32(
2082 from_kuid(&init_user_ns, attr->ia_uid));
2083 mask |= CEPH_SETATTR_UID;
2084 release |= CEPH_CAP_AUTH_SHARED;
2085 }
2086 }
2087 if (ia_valid & ATTR_GID) {
2088 dout("setattr %p gid %d -> %d\n", inode,
2089 from_kgid(&init_user_ns, inode->i_gid),
2090 from_kgid(&init_user_ns, attr->ia_gid));
2091 if (issued & CEPH_CAP_AUTH_EXCL) {
2092 inode->i_gid = attr->ia_gid;
2093 dirtied |= CEPH_CAP_AUTH_EXCL;
2094 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2095 !gid_eq(attr->ia_gid, inode->i_gid)) {
2096 req->r_args.setattr.gid = cpu_to_le32(
2097 from_kgid(&init_user_ns, attr->ia_gid));
2098 mask |= CEPH_SETATTR_GID;
2099 release |= CEPH_CAP_AUTH_SHARED;
2100 }
2101 }
2102 if (ia_valid & ATTR_MODE) {
2103 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
2104 attr->ia_mode);
2105 if (issued & CEPH_CAP_AUTH_EXCL) {
2106 inode->i_mode = attr->ia_mode;
2107 dirtied |= CEPH_CAP_AUTH_EXCL;
2108 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
2109 attr->ia_mode != inode->i_mode) {
2110 inode->i_mode = attr->ia_mode;
2111 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
2112 mask |= CEPH_SETATTR_MODE;
2113 release |= CEPH_CAP_AUTH_SHARED;
2114 }
2115 }
2116
2117 if (ia_valid & ATTR_ATIME) {
2118 dout("setattr %p atime %lld.%ld -> %lld.%ld\n", inode,
2119 inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
2120 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
2121 if (issued & CEPH_CAP_FILE_EXCL) {
2122 ci->i_time_warp_seq++;
2123 inode->i_atime = attr->ia_atime;
2124 dirtied |= CEPH_CAP_FILE_EXCL;
2125 } else if ((issued & CEPH_CAP_FILE_WR) &&
2126 timespec64_compare(&inode->i_atime,
2127 &attr->ia_atime) < 0) {
2128 inode->i_atime = attr->ia_atime;
2129 dirtied |= CEPH_CAP_FILE_WR;
2130 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2131 !timespec64_equal(&inode->i_atime, &attr->ia_atime)) {
2132 ceph_encode_timespec64(&req->r_args.setattr.atime,
2133 &attr->ia_atime);
2134 mask |= CEPH_SETATTR_ATIME;
2135 release |= CEPH_CAP_FILE_SHARED |
2136 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2137 }
2138 }
2139 if (ia_valid & ATTR_SIZE) {
2140 dout("setattr %p size %lld -> %lld\n", inode,
2141 inode->i_size, attr->ia_size);
2142 if ((issued & CEPH_CAP_FILE_EXCL) &&
2143 attr->ia_size > inode->i_size) {
2144 i_size_write(inode, attr->ia_size);
2145 inode->i_blocks = calc_inode_blocks(attr->ia_size);
2146 ci->i_reported_size = attr->ia_size;
2147 dirtied |= CEPH_CAP_FILE_EXCL;
2148 ia_valid |= ATTR_MTIME;
2149 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2150 attr->ia_size != inode->i_size) {
2151 req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
2152 req->r_args.setattr.old_size =
2153 cpu_to_le64(inode->i_size);
2154 mask |= CEPH_SETATTR_SIZE;
2155 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
2156 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2157 }
2158 }
2159 if (ia_valid & ATTR_MTIME) {
2160 dout("setattr %p mtime %lld.%ld -> %lld.%ld\n", inode,
2161 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
2162 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
2163 if (issued & CEPH_CAP_FILE_EXCL) {
2164 ci->i_time_warp_seq++;
2165 inode->i_mtime = attr->ia_mtime;
2166 dirtied |= CEPH_CAP_FILE_EXCL;
2167 } else if ((issued & CEPH_CAP_FILE_WR) &&
2168 timespec64_compare(&inode->i_mtime,
2169 &attr->ia_mtime) < 0) {
2170 inode->i_mtime = attr->ia_mtime;
2171 dirtied |= CEPH_CAP_FILE_WR;
2172 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
2173 !timespec64_equal(&inode->i_mtime, &attr->ia_mtime)) {
2174 ceph_encode_timespec64(&req->r_args.setattr.mtime,
2175 &attr->ia_mtime);
2176 mask |= CEPH_SETATTR_MTIME;
2177 release |= CEPH_CAP_FILE_SHARED |
2178 CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
2179 }
2180 }
2181
2182 /* these do nothing */
2183 if (ia_valid & ATTR_CTIME) {
2184 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
2185 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
2186 dout("setattr %p ctime %lld.%ld -> %lld.%ld (%s)\n", inode,
2187 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
2188 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
2189 only ? "ctime only" : "ignored");
2190 if (only) {
2191 /*
2192 * if kernel wants to dirty ctime but nothing else,
2193 * we need to choose a cap to dirty under, or do
2194 * a almost-no-op setattr
2195 */
2196 if (issued & CEPH_CAP_AUTH_EXCL)
2197 dirtied |= CEPH_CAP_AUTH_EXCL;
2198 else if (issued & CEPH_CAP_FILE_EXCL)
2199 dirtied |= CEPH_CAP_FILE_EXCL;
2200 else if (issued & CEPH_CAP_XATTR_EXCL)
2201 dirtied |= CEPH_CAP_XATTR_EXCL;
2202 else
2203 mask |= CEPH_SETATTR_CTIME;
2204 }
2205 }
2206 if (ia_valid & ATTR_FILE)
2207 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
2208
2209 if (dirtied) {
2210 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
2211 &prealloc_cf);
2212 inode->i_ctime = attr->ia_ctime;
2213 }
2214
2215 release &= issued;
2216 spin_unlock(&ci->i_ceph_lock);
2217 if (lock_snap_rwsem)
2218 up_read(&mdsc->snap_rwsem);
2219
2220 if (inode_dirty_flags)
2221 __mark_inode_dirty(inode, inode_dirty_flags);
2222
2223
2224 if (mask) {
2225 req->r_inode = inode;
2226 ihold(inode);
2227 req->r_inode_drop = release;
2228 req->r_args.setattr.mask = cpu_to_le32(mask);
2229 req->r_num_caps = 1;
2230 req->r_stamp = attr->ia_ctime;
2231 err = ceph_mdsc_do_request(mdsc, NULL, req);
2232 }
2233 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
2234 ceph_cap_string(dirtied), mask);
2235
2236 ceph_mdsc_put_request(req);
2237 ceph_free_cap_flush(prealloc_cf);
2238
2239 if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
2240 __ceph_do_pending_vmtruncate(inode);
2241
2242 return err;
2243 }
2244
2245 /*
2246 * setattr
2247 */
ceph_setattr(struct dentry * dentry,struct iattr * attr)2248 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
2249 {
2250 struct inode *inode = d_inode(dentry);
2251 struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
2252 int err;
2253
2254 if (ceph_snap(inode) != CEPH_NOSNAP)
2255 return -EROFS;
2256
2257 err = setattr_prepare(dentry, attr);
2258 if (err != 0)
2259 return err;
2260
2261 if ((attr->ia_valid & ATTR_SIZE) &&
2262 attr->ia_size > max(inode->i_size, fsc->max_file_size))
2263 return -EFBIG;
2264
2265 if ((attr->ia_valid & ATTR_SIZE) &&
2266 ceph_quota_is_max_bytes_exceeded(inode, attr->ia_size))
2267 return -EDQUOT;
2268
2269 err = __ceph_setattr(inode, attr);
2270
2271 if (err >= 0 && (attr->ia_valid & ATTR_MODE))
2272 err = posix_acl_chmod(inode, attr->ia_mode);
2273
2274 return err;
2275 }
2276
2277 /*
2278 * Verify that we have a lease on the given mask. If not,
2279 * do a getattr against an mds.
2280 */
__ceph_do_getattr(struct inode * inode,struct page * locked_page,int mask,bool force)2281 int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
2282 int mask, bool force)
2283 {
2284 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
2285 struct ceph_mds_client *mdsc = fsc->mdsc;
2286 struct ceph_mds_request *req;
2287 int mode;
2288 int err;
2289
2290 if (ceph_snap(inode) == CEPH_SNAPDIR) {
2291 dout("do_getattr inode %p SNAPDIR\n", inode);
2292 return 0;
2293 }
2294
2295 dout("do_getattr inode %p mask %s mode 0%o\n",
2296 inode, ceph_cap_string(mask), inode->i_mode);
2297 if (!force && ceph_caps_issued_mask_metric(ceph_inode(inode), mask, 1))
2298 return 0;
2299
2300 mode = (mask & CEPH_STAT_RSTAT) ? USE_AUTH_MDS : USE_ANY_MDS;
2301 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
2302 if (IS_ERR(req))
2303 return PTR_ERR(req);
2304 req->r_inode = inode;
2305 ihold(inode);
2306 req->r_num_caps = 1;
2307 req->r_args.getattr.mask = cpu_to_le32(mask);
2308 req->r_locked_page = locked_page;
2309 err = ceph_mdsc_do_request(mdsc, NULL, req);
2310 if (locked_page && err == 0) {
2311 u64 inline_version = req->r_reply_info.targeti.inline_version;
2312 if (inline_version == 0) {
2313 /* the reply is supposed to contain inline data */
2314 err = -EINVAL;
2315 } else if (inline_version == CEPH_INLINE_NONE) {
2316 err = -ENODATA;
2317 } else {
2318 err = req->r_reply_info.targeti.inline_len;
2319 }
2320 }
2321 ceph_mdsc_put_request(req);
2322 dout("do_getattr result=%d\n", err);
2323 return err;
2324 }
2325
2326
2327 /*
2328 * Check inode permissions. We verify we have a valid value for
2329 * the AUTH cap, then call the generic handler.
2330 */
ceph_permission(struct inode * inode,int mask)2331 int ceph_permission(struct inode *inode, int mask)
2332 {
2333 int err;
2334
2335 if (mask & MAY_NOT_BLOCK)
2336 return -ECHILD;
2337
2338 err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
2339
2340 if (!err)
2341 err = generic_permission(inode, mask);
2342 return err;
2343 }
2344
2345 /* Craft a mask of needed caps given a set of requested statx attrs. */
statx_to_caps(u32 want)2346 static int statx_to_caps(u32 want)
2347 {
2348 int mask = 0;
2349
2350 if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME|STATX_BTIME))
2351 mask |= CEPH_CAP_AUTH_SHARED;
2352
2353 if (want & (STATX_NLINK|STATX_CTIME))
2354 mask |= CEPH_CAP_LINK_SHARED;
2355
2356 if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE|
2357 STATX_BLOCKS))
2358 mask |= CEPH_CAP_FILE_SHARED;
2359
2360 if (want & (STATX_CTIME))
2361 mask |= CEPH_CAP_XATTR_SHARED;
2362
2363 return mask;
2364 }
2365
2366 /*
2367 * Get all the attributes. If we have sufficient caps for the requested attrs,
2368 * then we can avoid talking to the MDS at all.
2369 */
ceph_getattr(const struct path * path,struct kstat * stat,u32 request_mask,unsigned int flags)2370 int ceph_getattr(const struct path *path, struct kstat *stat,
2371 u32 request_mask, unsigned int flags)
2372 {
2373 struct inode *inode = d_inode(path->dentry);
2374 struct ceph_inode_info *ci = ceph_inode(inode);
2375 u32 valid_mask = STATX_BASIC_STATS;
2376 int err = 0;
2377
2378 /* Skip the getattr altogether if we're asked not to sync */
2379 if (!(flags & AT_STATX_DONT_SYNC)) {
2380 err = ceph_do_getattr(inode, statx_to_caps(request_mask),
2381 flags & AT_STATX_FORCE_SYNC);
2382 if (err)
2383 return err;
2384 }
2385
2386 generic_fillattr(inode, stat);
2387 stat->ino = ceph_present_inode(inode);
2388
2389 /*
2390 * btime on newly-allocated inodes is 0, so if this is still set to
2391 * that, then assume that it's not valid.
2392 */
2393 if (ci->i_btime.tv_sec || ci->i_btime.tv_nsec) {
2394 stat->btime = ci->i_btime;
2395 valid_mask |= STATX_BTIME;
2396 }
2397
2398 if (ceph_snap(inode) == CEPH_NOSNAP)
2399 stat->dev = inode->i_sb->s_dev;
2400 else
2401 stat->dev = ci->i_snapid_map ? ci->i_snapid_map->dev : 0;
2402
2403 if (S_ISDIR(inode->i_mode)) {
2404 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
2405 RBYTES))
2406 stat->size = ci->i_rbytes;
2407 else
2408 stat->size = ci->i_files + ci->i_subdirs;
2409 stat->blocks = 0;
2410 stat->blksize = 65536;
2411 /*
2412 * Some applications rely on the number of st_nlink
2413 * value on directories to be either 0 (if unlinked)
2414 * or 2 + number of subdirectories.
2415 */
2416 if (stat->nlink == 1)
2417 /* '.' + '..' + subdirs */
2418 stat->nlink = 1 + 1 + ci->i_subdirs;
2419 }
2420
2421 stat->result_mask = request_mask & valid_mask;
2422 return err;
2423 }
2424