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USB: Fix 'bad dma' problem on WDM device disconnect
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ceph / inode.c
blobb54c97da1c43fd8a4d52238d469c0aa6cb904772
1 #include <linux/ceph/ceph_debug.h>
2
3 #include <linux/module.h>
4 #include <linux/fs.h>
5 #include <linux/slab.h>
6 #include <linux/string.h>
7 #include <linux/uaccess.h>
8 #include <linux/kernel.h>
9 #include <linux/namei.h>
10 #include <linux/writeback.h>
11 #include <linux/vmalloc.h>
12 #include <linux/pagevec.h>
13
14 #include "super.h"
15 #include "mds_client.h"
16 #include <linux/ceph/decode.h>
17
18 /*
19 * Ceph inode operations
20 *
21 * Implement basic inode helpers (get, alloc) and inode ops (getattr,
22 * setattr, etc.), xattr helpers, and helpers for assimilating
23 * metadata returned by the MDS into our cache.
24 *
25 * Also define helpers for doing asynchronous writeback, invalidation,
26 * and truncation for the benefit of those who can't afford to block
27 * (typically because they are in the message handler path).
28 */
29
30 static const struct inode_operations ceph_symlink_iops;
31
32 static void ceph_invalidate_work(struct work_struct *work);
33 static void ceph_writeback_work(struct work_struct *work);
34 static void ceph_vmtruncate_work(struct work_struct *work);
35
36 /*
37 * find or create an inode, given the ceph ino number
38 */
39 static int ceph_set_ino_cb(struct inode *inode, void *data)
40 {
41 ceph_inode(inode)->i_vino = *(struct ceph_vino *)data;
42 inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data);
43 return 0;
44 }
45
46 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
47 {
48 struct inode *inode;
49 ino_t t = ceph_vino_to_ino(vino);
50
51 inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
52 if (inode == NULL)
53 return ERR_PTR(-ENOMEM);
54 if (inode->i_state & I_NEW) {
55 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
56 inode, ceph_vinop(inode), (u64)inode->i_ino);
57 unlock_new_inode(inode);
58 }
59
60 dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
61 vino.snap, inode);
62 return inode;
63 }
64
65 /*
66 * get/constuct snapdir inode for a given directory
67 */
68 struct inode *ceph_get_snapdir(struct inode *parent)
69 {
70 struct ceph_vino vino = {
71 .ino = ceph_ino(parent),
72 .snap = CEPH_SNAPDIR,
73 };
74 struct inode *inode = ceph_get_inode(parent->i_sb, vino);
75 struct ceph_inode_info *ci = ceph_inode(inode);
76
77 BUG_ON(!S_ISDIR(parent->i_mode));
78 if (IS_ERR(inode))
79 return inode;
80 inode->i_mode = parent->i_mode;
81 inode->i_uid = parent->i_uid;
82 inode->i_gid = parent->i_gid;
83 inode->i_op = &ceph_dir_iops;
84 inode->i_fop = &ceph_dir_fops;
85 ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
86 ci->i_rbytes = 0;
87 return inode;
88 }
89
90 const struct inode_operations ceph_file_iops = {
91 .permission = ceph_permission,
92 .setattr = ceph_setattr,
93 .getattr = ceph_getattr,
94 .setxattr = ceph_setxattr,
95 .getxattr = ceph_getxattr,
96 .listxattr = ceph_listxattr,
97 .removexattr = ceph_removexattr,
98 };
99
100
101 /*
102 * We use a 'frag tree' to keep track of the MDS's directory fragments
103 * for a given inode (usually there is just a single fragment). We
104 * need to know when a child frag is delegated to a new MDS, or when
105 * it is flagged as replicated, so we can direct our requests
106 * accordingly.
107 */
108
109 /*
110 * find/create a frag in the tree
111 */
112 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
113 u32 f)
114 {
115 struct rb_node **p;
116 struct rb_node *parent = NULL;
117 struct ceph_inode_frag *frag;
118 int c;
119
120 p = &ci->i_fragtree.rb_node;
121 while (*p) {
122 parent = *p;
123 frag = rb_entry(parent, struct ceph_inode_frag, node);
124 c = ceph_frag_compare(f, frag->frag);
125 if (c < 0)
126 p = &(*p)->rb_left;
127 else if (c > 0)
128 p = &(*p)->rb_right;
129 else
130 return frag;
131 }
132
133 frag = kmalloc(sizeof(*frag), GFP_NOFS);
134 if (!frag) {
135 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
136 "frag %x\n", &ci->vfs_inode,
137 ceph_vinop(&ci->vfs_inode), f);
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 */
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 */
179 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
180 struct ceph_inode_frag *pfrag,
181 int *found)
182 {
183 u32 t = ceph_frag_make(0, 0);
184 struct ceph_inode_frag *frag;
185 unsigned nway, i;
186 u32 n;
187
188 if (found)
189 *found = 0;
190
191 mutex_lock(&ci->i_fragtree_mutex);
192 while (1) {
193 WARN_ON(!ceph_frag_contains_value(t, v));
194 frag = __ceph_find_frag(ci, t);
195 if (!frag)
196 break; /* t is a leaf */
197 if (frag->split_by == 0) {
198 if (pfrag)
199 memcpy(pfrag, frag, sizeof(*pfrag));
200 if (found)
201 *found = 1;
202 break;
203 }
204
205 /* choose child */
206 nway = 1 << frag->split_by;
207 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
208 frag->split_by, nway);
209 for (i = 0; i < nway; i++) {
210 n = ceph_frag_make_child(t, frag->split_by, i);
211 if (ceph_frag_contains_value(n, v)) {
212 t = n;
213 break;
214 }
215 }
216 BUG_ON(i == nway);
217 }
218 dout("choose_frag(%x) = %x\n", v, t);
219
220 mutex_unlock(&ci->i_fragtree_mutex);
221 return t;
222 }
223
224 /*
225 * Process dirfrag (delegation) info from the mds. Include leaf
226 * fragment in tree ONLY if ndist > 0. Otherwise, only
227 * branches/splits are included in i_fragtree)
228 */
229 static int ceph_fill_dirfrag(struct inode *inode,
230 struct ceph_mds_reply_dirfrag *dirinfo)
231 {
232 struct ceph_inode_info *ci = ceph_inode(inode);
233 struct ceph_inode_frag *frag;
234 u32 id = le32_to_cpu(dirinfo->frag);
235 int mds = le32_to_cpu(dirinfo->auth);
236 int ndist = le32_to_cpu(dirinfo->ndist);
237 int i;
238 int err = 0;
239
240 mutex_lock(&ci->i_fragtree_mutex);
241 if (ndist == 0) {
242 /* no delegation info needed. */
243 frag = __ceph_find_frag(ci, id);
244 if (!frag)
245 goto out;
246 if (frag->split_by == 0) {
247 /* tree leaf, remove */
248 dout("fill_dirfrag removed %llx.%llx frag %x"
249 " (no ref)\n", ceph_vinop(inode), id);
250 rb_erase(&frag->node, &ci->i_fragtree);
251 kfree(frag);
252 } else {
253 /* tree branch, keep and clear */
254 dout("fill_dirfrag cleared %llx.%llx frag %x"
255 " referral\n", ceph_vinop(inode), id);
256 frag->mds = -1;
257 frag->ndist = 0;
258 }
259 goto out;
260 }
261
262
263 /* find/add this frag to store mds delegation info */
264 frag = __get_or_create_frag(ci, id);
265 if (IS_ERR(frag)) {
266 /* this is not the end of the world; we can continue
267 with bad/inaccurate delegation info */
268 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
269 ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
270 err = -ENOMEM;
271 goto out;
272 }
273
274 frag->mds = mds;
275 frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
276 for (i = 0; i < frag->ndist; i++)
277 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
278 dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
279 ceph_vinop(inode), frag->frag, frag->ndist);
280
281 out:
282 mutex_unlock(&ci->i_fragtree_mutex);
283 return err;
284 }
285
286
287 /*
288 * initialize a newly allocated inode.
289 */
290 struct inode *ceph_alloc_inode(struct super_block *sb)
291 {
292 struct ceph_inode_info *ci;
293 int i;
294
295 ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
296 if (!ci)
297 return NULL;
298
299 dout("alloc_inode %p\n", &ci->vfs_inode);
300
301 ci->i_version = 0;
302 ci->i_time_warp_seq = 0;
303 ci->i_ceph_flags = 0;
304 ci->i_release_count = 0;
305 ci->i_symlink = NULL;
306
307 memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
308
309 ci->i_fragtree = RB_ROOT;
310 mutex_init(&ci->i_fragtree_mutex);
311
312 ci->i_xattrs.blob = NULL;
313 ci->i_xattrs.prealloc_blob = NULL;
314 ci->i_xattrs.dirty = false;
315 ci->i_xattrs.index = RB_ROOT;
316 ci->i_xattrs.count = 0;
317 ci->i_xattrs.names_size = 0;
318 ci->i_xattrs.vals_size = 0;
319 ci->i_xattrs.version = 0;
320 ci->i_xattrs.index_version = 0;
321
322 ci->i_caps = RB_ROOT;
323 ci->i_auth_cap = NULL;
324 ci->i_dirty_caps = 0;
325 ci->i_flushing_caps = 0;
326 INIT_LIST_HEAD(&ci->i_dirty_item);
327 INIT_LIST_HEAD(&ci->i_flushing_item);
328 ci->i_cap_flush_seq = 0;
329 ci->i_cap_flush_last_tid = 0;
330 memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
331 init_waitqueue_head(&ci->i_cap_wq);
332 ci->i_hold_caps_min = 0;
333 ci->i_hold_caps_max = 0;
334 INIT_LIST_HEAD(&ci->i_cap_delay_list);
335 ci->i_cap_exporting_mds = 0;
336 ci->i_cap_exporting_mseq = 0;
337 ci->i_cap_exporting_issued = 0;
338 INIT_LIST_HEAD(&ci->i_cap_snaps);
339 ci->i_head_snapc = NULL;
340 ci->i_snap_caps = 0;
341
342 for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
343 ci->i_nr_by_mode[i] = 0;
344
345 ci->i_truncate_seq = 0;
346 ci->i_truncate_size = 0;
347 ci->i_truncate_pending = 0;
348
349 ci->i_max_size = 0;
350 ci->i_reported_size = 0;
351 ci->i_wanted_max_size = 0;
352 ci->i_requested_max_size = 0;
353
354 ci->i_pin_ref = 0;
355 ci->i_rd_ref = 0;
356 ci->i_rdcache_ref = 0;
357 ci->i_wr_ref = 0;
358 ci->i_wrbuffer_ref = 0;
359 ci->i_wrbuffer_ref_head = 0;
360 ci->i_shared_gen = 0;
361 ci->i_rdcache_gen = 0;
362 ci->i_rdcache_revoking = 0;
363
364 INIT_LIST_HEAD(&ci->i_unsafe_writes);
365 INIT_LIST_HEAD(&ci->i_unsafe_dirops);
366 spin_lock_init(&ci->i_unsafe_lock);
367
368 ci->i_snap_realm = NULL;
369 INIT_LIST_HEAD(&ci->i_snap_realm_item);
370 INIT_LIST_HEAD(&ci->i_snap_flush_item);
371
372 INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
373 INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
374
375 INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
376
377 return &ci->vfs_inode;
378 }
379
380 static void ceph_i_callback(struct rcu_head *head)
381 {
382 struct inode *inode = container_of(head, struct inode, i_rcu);
383 struct ceph_inode_info *ci = ceph_inode(inode);
384
385 INIT_LIST_HEAD(&inode->i_dentry);
386 kmem_cache_free(ceph_inode_cachep, ci);
387 }
388
389 void ceph_destroy_inode(struct inode *inode)
390 {
391 struct ceph_inode_info *ci = ceph_inode(inode);
392 struct ceph_inode_frag *frag;
393 struct rb_node *n;
394
395 dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
396
397 ceph_queue_caps_release(inode);
398
399 /*
400 * we may still have a snap_realm reference if there are stray
401 * caps in i_cap_exporting_issued or i_snap_caps.
402 */
403 if (ci->i_snap_realm) {
404 struct ceph_mds_client *mdsc =
405 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
406 struct ceph_snap_realm *realm = ci->i_snap_realm;
407
408 dout(" dropping residual ref to snap realm %p\n", realm);
409 spin_lock(&realm->inodes_with_caps_lock);
410 list_del_init(&ci->i_snap_realm_item);
411 spin_unlock(&realm->inodes_with_caps_lock);
412 ceph_put_snap_realm(mdsc, realm);
413 }
414
415 kfree(ci->i_symlink);
416 while ((n = rb_first(&ci->i_fragtree)) != NULL) {
417 frag = rb_entry(n, struct ceph_inode_frag, node);
418 rb_erase(n, &ci->i_fragtree);
419 kfree(frag);
420 }
421
422 __ceph_destroy_xattrs(ci);
423 if (ci->i_xattrs.blob)
424 ceph_buffer_put(ci->i_xattrs.blob);
425 if (ci->i_xattrs.prealloc_blob)
426 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
427
428 call_rcu(&inode->i_rcu, ceph_i_callback);
429 }
430
431
432 /*
433 * Helpers to fill in size, ctime, mtime, and atime. We have to be
434 * careful because either the client or MDS may have more up to date
435 * info, depending on which capabilities are held, and whether
436 * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime
437 * and size are monotonically increasing, except when utimes() or
438 * truncate() increments the corresponding _seq values.)
439 */
440 int ceph_fill_file_size(struct inode *inode, int issued,
441 u32 truncate_seq, u64 truncate_size, u64 size)
442 {
443 struct ceph_inode_info *ci = ceph_inode(inode);
444 int queue_trunc = 0;
445
446 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
447 (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
448 dout("size %lld -> %llu\n", inode->i_size, size);
449 inode->i_size = size;
450 inode->i_blocks = (size + (1<<9) - 1) >> 9;
451 ci->i_reported_size = size;
452 if (truncate_seq != ci->i_truncate_seq) {
453 dout("truncate_seq %u -> %u\n",
454 ci->i_truncate_seq, truncate_seq);
455 ci->i_truncate_seq = truncate_seq;
456 /*
457 * If we hold relevant caps, or in the case where we're
458 * not the only client referencing this file and we
459 * don't hold those caps, then we need to check whether
460 * the file is either opened or mmaped
461 */
462 if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_RD|
463 CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER|
464 CEPH_CAP_FILE_EXCL|
465 CEPH_CAP_FILE_LAZYIO)) ||
466 mapping_mapped(inode->i_mapping) ||
467 __ceph_caps_file_wanted(ci)) {
468 ci->i_truncate_pending++;
469 queue_trunc = 1;
470 }
471 }
472 }
473 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
474 ci->i_truncate_size != truncate_size) {
475 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
476 truncate_size);
477 ci->i_truncate_size = truncate_size;
478 }
479 return queue_trunc;
480 }
481
482 void ceph_fill_file_time(struct inode *inode, int issued,
483 u64 time_warp_seq, struct timespec *ctime,
484 struct timespec *mtime, struct timespec *atime)
485 {
486 struct ceph_inode_info *ci = ceph_inode(inode);
487 int warn = 0;
488
489 if (issued & (CEPH_CAP_FILE_EXCL|
490 CEPH_CAP_FILE_WR|
491 CEPH_CAP_FILE_BUFFER|
492 CEPH_CAP_AUTH_EXCL|
493 CEPH_CAP_XATTR_EXCL)) {
494 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
495 dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
496 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
497 ctime->tv_sec, ctime->tv_nsec);
498 inode->i_ctime = *ctime;
499 }
500 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
501 /* the MDS did a utimes() */
502 dout("mtime %ld.%09ld -> %ld.%09ld "
503 "tw %d -> %d\n",
504 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
505 mtime->tv_sec, mtime->tv_nsec,
506 ci->i_time_warp_seq, (int)time_warp_seq);
507
508 inode->i_mtime = *mtime;
509 inode->i_atime = *atime;
510 ci->i_time_warp_seq = time_warp_seq;
511 } else if (time_warp_seq == ci->i_time_warp_seq) {
512 /* nobody did utimes(); take the max */
513 if (timespec_compare(mtime, &inode->i_mtime) > 0) {
514 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
515 inode->i_mtime.tv_sec,
516 inode->i_mtime.tv_nsec,
517 mtime->tv_sec, mtime->tv_nsec);
518 inode->i_mtime = *mtime;
519 }
520 if (timespec_compare(atime, &inode->i_atime) > 0) {
521 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
522 inode->i_atime.tv_sec,
523 inode->i_atime.tv_nsec,
524 atime->tv_sec, atime->tv_nsec);
525 inode->i_atime = *atime;
526 }
527 } else if (issued & CEPH_CAP_FILE_EXCL) {
528 /* we did a utimes(); ignore mds values */
529 } else {
530 warn = 1;
531 }
532 } else {
533 /* we have no write|excl caps; whatever the MDS says is true */
534 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
535 inode->i_ctime = *ctime;
536 inode->i_mtime = *mtime;
537 inode->i_atime = *atime;
538 ci->i_time_warp_seq = time_warp_seq;
539 } else {
540 warn = 1;
541 }
542 }
543 if (warn) /* time_warp_seq shouldn't go backwards */
544 dout("%p mds time_warp_seq %llu < %u\n",
545 inode, time_warp_seq, ci->i_time_warp_seq);
546 }
547
548 /*
549 * Populate an inode based on info from mds. May be called on new or
550 * existing inodes.
551 */
552 static int fill_inode(struct inode *inode,
553 struct ceph_mds_reply_info_in *iinfo,
554 struct ceph_mds_reply_dirfrag *dirinfo,
555 struct ceph_mds_session *session,
556 unsigned long ttl_from, int cap_fmode,
557 struct ceph_cap_reservation *caps_reservation)
558 {
559 struct ceph_mds_reply_inode *info = iinfo->in;
560 struct ceph_inode_info *ci = ceph_inode(inode);
561 int i;
562 int issued, implemented;
563 struct timespec mtime, atime, ctime;
564 u32 nsplits;
565 struct ceph_buffer *xattr_blob = NULL;
566 int err = 0;
567 int queue_trunc = 0;
568
569 dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
570 inode, ceph_vinop(inode), le64_to_cpu(info->version),
571 ci->i_version);
572
573 /*
574 * prealloc xattr data, if it looks like we'll need it. only
575 * if len > 4 (meaning there are actually xattrs; the first 4
576 * bytes are the xattr count).
577 */
578 if (iinfo->xattr_len > 4) {
579 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
580 if (!xattr_blob)
581 pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
582 iinfo->xattr_len);
583 }
584
585 spin_lock(&inode->i_lock);
586
587 /*
588 * provided version will be odd if inode value is projected,
589 * even if stable. skip the update if we have newer stable
590 * info (ours>=theirs, e.g. due to racing mds replies), unless
591 * we are getting projected (unstable) info (in which case the
592 * version is odd, and we want ours>theirs).
593 * us them
594 * 2 2 skip
595 * 3 2 skip
596 * 3 3 update
597 */
598 if (le64_to_cpu(info->version) > 0 &&
599 (ci->i_version & ~1) >= le64_to_cpu(info->version))
600 goto no_change;
601
602 issued = __ceph_caps_issued(ci, &implemented);
603 issued |= implemented | __ceph_caps_dirty(ci);
604
605 /* update inode */
606 ci->i_version = le64_to_cpu(info->version);
607 inode->i_version++;
608 inode->i_rdev = le32_to_cpu(info->rdev);
609
610 if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
611 inode->i_mode = le32_to_cpu(info->mode);
612 inode->i_uid = le32_to_cpu(info->uid);
613 inode->i_gid = le32_to_cpu(info->gid);
614 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
615 inode->i_uid, inode->i_gid);
616 }
617
618 if ((issued & CEPH_CAP_LINK_EXCL) == 0)
619 inode->i_nlink = le32_to_cpu(info->nlink);
620
621 /* be careful with mtime, atime, size */
622 ceph_decode_timespec(&atime, &info->atime);
623 ceph_decode_timespec(&mtime, &info->mtime);
624 ceph_decode_timespec(&ctime, &info->ctime);
625 queue_trunc = ceph_fill_file_size(inode, issued,
626 le32_to_cpu(info->truncate_seq),
627 le64_to_cpu(info->truncate_size),
628 le64_to_cpu(info->size));
629 ceph_fill_file_time(inode, issued,
630 le32_to_cpu(info->time_warp_seq),
631 &ctime, &mtime, &atime);
632
633 /* only update max_size on auth cap */
634 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
635 ci->i_max_size != le64_to_cpu(info->max_size)) {
636 dout("max_size %lld -> %llu\n", ci->i_max_size,
637 le64_to_cpu(info->max_size));
638 ci->i_max_size = le64_to_cpu(info->max_size);
639 }
640
641 ci->i_layout = info->layout;
642 inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
643
644 /* xattrs */
645 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
646 if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
647 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
648 if (ci->i_xattrs.blob)
649 ceph_buffer_put(ci->i_xattrs.blob);
650 ci->i_xattrs.blob = xattr_blob;
651 if (xattr_blob)
652 memcpy(ci->i_xattrs.blob->vec.iov_base,
653 iinfo->xattr_data, iinfo->xattr_len);
654 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
655 xattr_blob = NULL;
656 }
657
658 inode->i_mapping->a_ops = &ceph_aops;
659 inode->i_mapping->backing_dev_info =
660 &ceph_sb_to_client(inode->i_sb)->backing_dev_info;
661
662 switch (inode->i_mode & S_IFMT) {
663 case S_IFIFO:
664 case S_IFBLK:
665 case S_IFCHR:
666 case S_IFSOCK:
667 init_special_inode(inode, inode->i_mode, inode->i_rdev);
668 inode->i_op = &ceph_file_iops;
669 break;
670 case S_IFREG:
671 inode->i_op = &ceph_file_iops;
672 inode->i_fop = &ceph_file_fops;
673 break;
674 case S_IFLNK:
675 inode->i_op = &ceph_symlink_iops;
676 if (!ci->i_symlink) {
677 int symlen = iinfo->symlink_len;
678 char *sym;
679
680 BUG_ON(symlen != inode->i_size);
681 spin_unlock(&inode->i_lock);
682
683 err = -ENOMEM;
684 sym = kmalloc(symlen+1, GFP_NOFS);
685 if (!sym)
686 goto out;
687 memcpy(sym, iinfo->symlink, symlen);
688 sym[symlen] = 0;
689
690 spin_lock(&inode->i_lock);
691 if (!ci->i_symlink)
692 ci->i_symlink = sym;
693 else
694 kfree(sym); /* lost a race */
695 }
696 break;
697 case S_IFDIR:
698 inode->i_op = &ceph_dir_iops;
699 inode->i_fop = &ceph_dir_fops;
700
701 ci->i_dir_layout = iinfo->dir_layout;
702
703 ci->i_files = le64_to_cpu(info->files);
704 ci->i_subdirs = le64_to_cpu(info->subdirs);
705 ci->i_rbytes = le64_to_cpu(info->rbytes);
706 ci->i_rfiles = le64_to_cpu(info->rfiles);
707 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
708 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
709
710 /* set dir completion flag? */
711 if (ci->i_files == 0 && ci->i_subdirs == 0 &&
712 ceph_snap(inode) == CEPH_NOSNAP &&
713 (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
714 (issued & CEPH_CAP_FILE_EXCL) == 0 &&
715 (ci->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
716 dout(" marking %p complete (empty)\n", inode);
717 /* ci->i_ceph_flags |= CEPH_I_COMPLETE; */
718 ci->i_max_offset = 2;
719 }
720 break;
721 default:
722 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
723 ceph_vinop(inode), inode->i_mode);
724 }
725
726 no_change:
727 spin_unlock(&inode->i_lock);
728
729 /* queue truncate if we saw i_size decrease */
730 if (queue_trunc)
731 ceph_queue_vmtruncate(inode);
732
733 /* populate frag tree */
734 /* FIXME: move me up, if/when version reflects fragtree changes */
735 nsplits = le32_to_cpu(info->fragtree.nsplits);
736 mutex_lock(&ci->i_fragtree_mutex);
737 for (i = 0; i < nsplits; i++) {
738 u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
739 struct ceph_inode_frag *frag = __get_or_create_frag(ci, id);
740
741 if (IS_ERR(frag))
742 continue;
743 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
744 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
745 }
746 mutex_unlock(&ci->i_fragtree_mutex);
747
748 /* were we issued a capability? */
749 if (info->cap.caps) {
750 if (ceph_snap(inode) == CEPH_NOSNAP) {
751 ceph_add_cap(inode, session,
752 le64_to_cpu(info->cap.cap_id),
753 cap_fmode,
754 le32_to_cpu(info->cap.caps),
755 le32_to_cpu(info->cap.wanted),
756 le32_to_cpu(info->cap.seq),
757 le32_to_cpu(info->cap.mseq),
758 le64_to_cpu(info->cap.realm),
759 info->cap.flags,
760 caps_reservation);
761 } else {
762 spin_lock(&inode->i_lock);
763 dout(" %p got snap_caps %s\n", inode,
764 ceph_cap_string(le32_to_cpu(info->cap.caps)));
765 ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
766 if (cap_fmode >= 0)
767 __ceph_get_fmode(ci, cap_fmode);
768 spin_unlock(&inode->i_lock);
769 }
770 } else if (cap_fmode >= 0) {
771 pr_warning("mds issued no caps on %llx.%llx\n",
772 ceph_vinop(inode));
773 __ceph_get_fmode(ci, cap_fmode);
774 }
775
776 /* update delegation info? */
777 if (dirinfo)
778 ceph_fill_dirfrag(inode, dirinfo);
779
780 err = 0;
781
782 out:
783 if (xattr_blob)
784 ceph_buffer_put(xattr_blob);
785 return err;
786 }
787
788 /*
789 * caller should hold session s_mutex.
790 */
791 static void update_dentry_lease(struct dentry *dentry,
792 struct ceph_mds_reply_lease *lease,
793 struct ceph_mds_session *session,
794 unsigned long from_time)
795 {
796 struct ceph_dentry_info *di = ceph_dentry(dentry);
797 long unsigned duration = le32_to_cpu(lease->duration_ms);
798 long unsigned ttl = from_time + (duration * HZ) / 1000;
799 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
800 struct inode *dir;
801
802 /* only track leases on regular dentries */
803 if (dentry->d_op != &ceph_dentry_ops)
804 return;
805
806 spin_lock(&dentry->d_lock);
807 dout("update_dentry_lease %p mask %d duration %lu ms ttl %lu\n",
808 dentry, le16_to_cpu(lease->mask), duration, ttl);
809
810 /* make lease_rdcache_gen match directory */
811 dir = dentry->d_parent->d_inode;
812 di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
813
814 if (lease->mask == 0)
815 goto out_unlock;
816
817 if (di->lease_gen == session->s_cap_gen &&
818 time_before(ttl, dentry->d_time))
819 goto out_unlock; /* we already have a newer lease. */
820
821 if (di->lease_session && di->lease_session != session)
822 goto out_unlock;
823
824 ceph_dentry_lru_touch(dentry);
825
826 if (!di->lease_session)
827 di->lease_session = ceph_get_mds_session(session);
828 di->lease_gen = session->s_cap_gen;
829 di->lease_seq = le32_to_cpu(lease->seq);
830 di->lease_renew_after = half_ttl;
831 di->lease_renew_from = 0;
832 dentry->d_time = ttl;
833 out_unlock:
834 spin_unlock(&dentry->d_lock);
835 return;
836 }
837
838 /*
839 * Set dentry's directory position based on the current dir's max, and
840 * order it in d_subdirs, so that dcache_readdir behaves.
841 */
842 static void ceph_set_dentry_offset(struct dentry *dn)
843 {
844 struct dentry *dir = dn->d_parent;
845 struct inode *inode = dn->d_parent->d_inode;
846 struct ceph_dentry_info *di;
847
848 BUG_ON(!inode);
849
850 di = ceph_dentry(dn);
851
852 spin_lock(&inode->i_lock);
853 if ((ceph_inode(inode)->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
854 spin_unlock(&inode->i_lock);
855 return;
856 }
857 di->offset = ceph_inode(inode)->i_max_offset++;
858 spin_unlock(&inode->i_lock);
859
860 spin_lock(&dir->d_lock);
861 spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
862 list_move(&dn->d_u.d_child, &dir->d_subdirs);
863 dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
864 dn->d_u.d_child.prev, dn->d_u.d_child.next);
865 spin_unlock(&dn->d_lock);
866 spin_unlock(&dir->d_lock);
867 }
868
869 /*
870 * splice a dentry to an inode.
871 * caller must hold directory i_mutex for this to be safe.
872 *
873 * we will only rehash the resulting dentry if @prehash is
874 * true; @prehash will be set to false (for the benefit of
875 * the caller) if we fail.
876 */
877 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
878 bool *prehash, bool set_offset)
879 {
880 struct dentry *realdn;
881
882 BUG_ON(dn->d_inode);
883
884 /* dn must be unhashed */
885 if (!d_unhashed(dn))
886 d_drop(dn);
887 realdn = d_materialise_unique(dn, in);
888 if (IS_ERR(realdn)) {
889 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
890 PTR_ERR(realdn), dn, in, ceph_vinop(in));
891 if (prehash)
892 *prehash = false; /* don't rehash on error */
893 dn = realdn; /* note realdn contains the error */
894 goto out;
895 } else if (realdn) {
896 dout("dn %p (%d) spliced with %p (%d) "
897 "inode %p ino %llx.%llx\n",
898 dn, dn->d_count,
899 realdn, realdn->d_count,
900 realdn->d_inode, ceph_vinop(realdn->d_inode));
901 dput(dn);
902 dn = realdn;
903 } else {
904 BUG_ON(!ceph_dentry(dn));
905 dout("dn %p attached to %p ino %llx.%llx\n",
906 dn, dn->d_inode, ceph_vinop(dn->d_inode));
907 }
908 if ((!prehash || *prehash) && d_unhashed(dn))
909 d_rehash(dn);
910 if (set_offset)
911 ceph_set_dentry_offset(dn);
912 out:
913 return dn;
914 }
915
916 /*
917 * Incorporate results into the local cache. This is either just
918 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
919 * after a lookup).
920 *
921 * A reply may contain
922 * a directory inode along with a dentry.
923 * and/or a target inode
924 *
925 * Called with snap_rwsem (read).
926 */
927 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
928 struct ceph_mds_session *session)
929 {
930 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
931 struct inode *in = NULL;
932 struct ceph_mds_reply_inode *ininfo;
933 struct ceph_vino vino;
934 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
935 int i = 0;
936 int err = 0;
937
938 dout("fill_trace %p is_dentry %d is_target %d\n", req,
939 rinfo->head->is_dentry, rinfo->head->is_target);
940
941 #if 0
942 /*
943 * Debugging hook:
944 *
945 * If we resend completed ops to a recovering mds, we get no
946 * trace. Since that is very rare, pretend this is the case
947 * to ensure the 'no trace' handlers in the callers behave.
948 *
949 * Fill in inodes unconditionally to avoid breaking cap
950 * invariants.
951 */
952 if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
953 pr_info("fill_trace faking empty trace on %lld %s\n",
954 req->r_tid, ceph_mds_op_name(rinfo->head->op));
955 if (rinfo->head->is_dentry) {
956 rinfo->head->is_dentry = 0;
957 err = fill_inode(req->r_locked_dir,
958 &rinfo->diri, rinfo->dirfrag,
959 session, req->r_request_started, -1);
960 }
961 if (rinfo->head->is_target) {
962 rinfo->head->is_target = 0;
963 ininfo = rinfo->targeti.in;
964 vino.ino = le64_to_cpu(ininfo->ino);
965 vino.snap = le64_to_cpu(ininfo->snapid);
966 in = ceph_get_inode(sb, vino);
967 err = fill_inode(in, &rinfo->targeti, NULL,
968 session, req->r_request_started,
969 req->r_fmode);
970 iput(in);
971 }
972 }
973 #endif
974
975 if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
976 dout("fill_trace reply is empty!\n");
977 if (rinfo->head->result == 0 && req->r_locked_dir)
978 ceph_invalidate_dir_request(req);
979 return 0;
980 }
981
982 if (rinfo->head->is_dentry) {
983 struct inode *dir = req->r_locked_dir;
984
985 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
986 session, req->r_request_started, -1,
987 &req->r_caps_reservation);
988 if (err < 0)
989 return err;
990 }
991
992 /*
993 * ignore null lease/binding on snapdir ENOENT, or else we
994 * will have trouble splicing in the virtual snapdir later
995 */
996 if (rinfo->head->is_dentry && !req->r_aborted &&
997 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
998 fsc->mount_options->snapdir_name,
999 req->r_dentry->d_name.len))) {
1000 /*
1001 * lookup link rename : null -> possibly existing inode
1002 * mknod symlink mkdir : null -> new inode
1003 * unlink : linked -> null
1004 */
1005 struct inode *dir = req->r_locked_dir;
1006 struct dentry *dn = req->r_dentry;
1007 bool have_dir_cap, have_lease;
1008
1009 BUG_ON(!dn);
1010 BUG_ON(!dir);
1011 BUG_ON(dn->d_parent->d_inode != dir);
1012 BUG_ON(ceph_ino(dir) !=
1013 le64_to_cpu(rinfo->diri.in->ino));
1014 BUG_ON(ceph_snap(dir) !=
1015 le64_to_cpu(rinfo->diri.in->snapid));
1016
1017 /* do we have a lease on the whole dir? */
1018 have_dir_cap =
1019 (le32_to_cpu(rinfo->diri.in->cap.caps) &
1020 CEPH_CAP_FILE_SHARED);
1021
1022 /* do we have a dn lease? */
1023 have_lease = have_dir_cap ||
1024 (le16_to_cpu(rinfo->dlease->mask) &
1025 CEPH_LOCK_DN);
1026
1027 if (!have_lease)
1028 dout("fill_trace no dentry lease or dir cap\n");
1029
1030 /* rename? */
1031 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1032 dout(" src %p '%.*s' dst %p '%.*s'\n",
1033 req->r_old_dentry,
1034 req->r_old_dentry->d_name.len,
1035 req->r_old_dentry->d_name.name,
1036 dn, dn->d_name.len, dn->d_name.name);
1037 dout("fill_trace doing d_move %p -> %p\n",
1038 req->r_old_dentry, dn);
1039
1040 d_move(req->r_old_dentry, dn);
1041 dout(" src %p '%.*s' dst %p '%.*s'\n",
1042 req->r_old_dentry,
1043 req->r_old_dentry->d_name.len,
1044 req->r_old_dentry->d_name.name,
1045 dn, dn->d_name.len, dn->d_name.name);
1046
1047 /* ensure target dentry is invalidated, despite
1048 rehashing bug in vfs_rename_dir */
1049 ceph_invalidate_dentry_lease(dn);
1050
1051 /*
1052 * d_move() puts the renamed dentry at the end of
1053 * d_subdirs. We need to assign it an appropriate
1054 * directory offset so we can behave when holding
1055 * I_COMPLETE.
1056 */
1057 ceph_set_dentry_offset(req->r_old_dentry);
1058 dout("dn %p gets new offset %lld\n", req->r_old_dentry,
1059 ceph_dentry(req->r_old_dentry)->offset);
1060
1061 dn = req->r_old_dentry; /* use old_dentry */
1062 in = dn->d_inode;
1063 }
1064
1065 /* null dentry? */
1066 if (!rinfo->head->is_target) {
1067 dout("fill_trace null dentry\n");
1068 if (dn->d_inode) {
1069 dout("d_delete %p\n", dn);
1070 d_delete(dn);
1071 } else {
1072 dout("d_instantiate %p NULL\n", dn);
1073 d_instantiate(dn, NULL);
1074 if (have_lease && d_unhashed(dn))
1075 d_rehash(dn);
1076 update_dentry_lease(dn, rinfo->dlease,
1077 session,
1078 req->r_request_started);
1079 }
1080 goto done;
1081 }
1082
1083 /* attach proper inode */
1084 ininfo = rinfo->targeti.in;
1085 vino.ino = le64_to_cpu(ininfo->ino);
1086 vino.snap = le64_to_cpu(ininfo->snapid);
1087 in = dn->d_inode;
1088 if (!in) {
1089 in = ceph_get_inode(sb, vino);
1090 if (IS_ERR(in)) {
1091 pr_err("fill_trace bad get_inode "
1092 "%llx.%llx\n", vino.ino, vino.snap);
1093 err = PTR_ERR(in);
1094 d_delete(dn);
1095 goto done;
1096 }
1097 dn = splice_dentry(dn, in, &have_lease, true);
1098 if (IS_ERR(dn)) {
1099 err = PTR_ERR(dn);
1100 goto done;
1101 }
1102 req->r_dentry = dn; /* may have spliced */
1103 igrab(in);
1104 } else if (ceph_ino(in) == vino.ino &&
1105 ceph_snap(in) == vino.snap) {
1106 igrab(in);
1107 } else {
1108 dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1109 dn, in, ceph_ino(in), ceph_snap(in),
1110 vino.ino, vino.snap);
1111 have_lease = false;
1112 in = NULL;
1113 }
1114
1115 if (have_lease)
1116 update_dentry_lease(dn, rinfo->dlease, session,
1117 req->r_request_started);
1118 dout(" final dn %p\n", dn);
1119 i++;
1120 } else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1121 req->r_op == CEPH_MDS_OP_MKSNAP) {
1122 struct dentry *dn = req->r_dentry;
1123
1124 /* fill out a snapdir LOOKUPSNAP dentry */
1125 BUG_ON(!dn);
1126 BUG_ON(!req->r_locked_dir);
1127 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1128 ininfo = rinfo->targeti.in;
1129 vino.ino = le64_to_cpu(ininfo->ino);
1130 vino.snap = le64_to_cpu(ininfo->snapid);
1131 in = ceph_get_inode(sb, vino);
1132 if (IS_ERR(in)) {
1133 pr_err("fill_inode get_inode badness %llx.%llx\n",
1134 vino.ino, vino.snap);
1135 err = PTR_ERR(in);
1136 d_delete(dn);
1137 goto done;
1138 }
1139 dout(" linking snapped dir %p to dn %p\n", in, dn);
1140 dn = splice_dentry(dn, in, NULL, true);
1141 if (IS_ERR(dn)) {
1142 err = PTR_ERR(dn);
1143 goto done;
1144 }
1145 req->r_dentry = dn; /* may have spliced */
1146 igrab(in);
1147 rinfo->head->is_dentry = 1; /* fool notrace handlers */
1148 }
1149
1150 if (rinfo->head->is_target) {
1151 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1152 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1153
1154 if (in == NULL || ceph_ino(in) != vino.ino ||
1155 ceph_snap(in) != vino.snap) {
1156 in = ceph_get_inode(sb, vino);
1157 if (IS_ERR(in)) {
1158 err = PTR_ERR(in);
1159 goto done;
1160 }
1161 }
1162 req->r_target_inode = in;
1163
1164 err = fill_inode(in,
1165 &rinfo->targeti, NULL,
1166 session, req->r_request_started,
1167 (le32_to_cpu(rinfo->head->result) == 0) ?
1168 req->r_fmode : -1,
1169 &req->r_caps_reservation);
1170 if (err < 0) {
1171 pr_err("fill_inode badness %p %llx.%llx\n",
1172 in, ceph_vinop(in));
1173 goto done;
1174 }
1175 }
1176
1177 done:
1178 dout("fill_trace done err=%d\n", err);
1179 return err;
1180 }
1181
1182 /*
1183 * Prepopulate our cache with readdir results, leases, etc.
1184 */
1185 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1186 struct ceph_mds_session *session)
1187 {
1188 struct dentry *parent = req->r_dentry;
1189 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1190 struct qstr dname;
1191 struct dentry *dn;
1192 struct inode *in;
1193 int err = 0, i;
1194 struct inode *snapdir = NULL;
1195 struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1196 u64 frag = le32_to_cpu(rhead->args.readdir.frag);
1197 struct ceph_dentry_info *di;
1198
1199 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1200 snapdir = ceph_get_snapdir(parent->d_inode);
1201 parent = d_find_alias(snapdir);
1202 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1203 rinfo->dir_nr, parent);
1204 } else {
1205 dout("readdir_prepopulate %d items under dn %p\n",
1206 rinfo->dir_nr, parent);
1207 if (rinfo->dir_dir)
1208 ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1209 }
1210
1211 for (i = 0; i < rinfo->dir_nr; i++) {
1212 struct ceph_vino vino;
1213
1214 dname.name = rinfo->dir_dname[i];
1215 dname.len = rinfo->dir_dname_len[i];
1216 dname.hash = full_name_hash(dname.name, dname.len);
1217
1218 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1219 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1220
1221 retry_lookup:
1222 dn = d_lookup(parent, &dname);
1223 dout("d_lookup on parent=%p name=%.*s got %p\n",
1224 parent, dname.len, dname.name, dn);
1225
1226 if (!dn) {
1227 dn = d_alloc(parent, &dname);
1228 dout("d_alloc %p '%.*s' = %p\n", parent,
1229 dname.len, dname.name, dn);
1230 if (dn == NULL) {
1231 dout("d_alloc badness\n");
1232 err = -ENOMEM;
1233 goto out;
1234 }
1235 err = ceph_init_dentry(dn);
1236 if (err < 0) {
1237 dput(dn);
1238 goto out;
1239 }
1240 } else if (dn->d_inode &&
1241 (ceph_ino(dn->d_inode) != vino.ino ||
1242 ceph_snap(dn->d_inode) != vino.snap)) {
1243 dout(" dn %p points to wrong inode %p\n",
1244 dn, dn->d_inode);
1245 d_delete(dn);
1246 dput(dn);
1247 goto retry_lookup;
1248 } else {
1249 /* reorder parent's d_subdirs */
1250 spin_lock(&parent->d_lock);
1251 spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED);
1252 list_move(&dn->d_u.d_child, &parent->d_subdirs);
1253 spin_unlock(&dn->d_lock);
1254 spin_unlock(&parent->d_lock);
1255 }
1256
1257 di = dn->d_fsdata;
1258 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1259
1260 /* inode */
1261 if (dn->d_inode) {
1262 in = dn->d_inode;
1263 } else {
1264 in = ceph_get_inode(parent->d_sb, vino);
1265 if (IS_ERR(in)) {
1266 dout("new_inode badness\n");
1267 d_delete(dn);
1268 dput(dn);
1269 err = PTR_ERR(in);
1270 goto out;
1271 }
1272 dn = splice_dentry(dn, in, NULL, false);
1273 if (IS_ERR(dn))
1274 dn = NULL;
1275 }
1276
1277 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1278 req->r_request_started, -1,
1279 &req->r_caps_reservation) < 0) {
1280 pr_err("fill_inode badness on %p\n", in);
1281 goto next_item;
1282 }
1283 if (dn)
1284 update_dentry_lease(dn, rinfo->dir_dlease[i],
1285 req->r_session,
1286 req->r_request_started);
1287 next_item:
1288 if (dn)
1289 dput(dn);
1290 }
1291 req->r_did_prepopulate = true;
1292
1293 out:
1294 if (snapdir) {
1295 iput(snapdir);
1296 dput(parent);
1297 }
1298 dout("readdir_prepopulate done\n");
1299 return err;
1300 }
1301
1302 int ceph_inode_set_size(struct inode *inode, loff_t size)
1303 {
1304 struct ceph_inode_info *ci = ceph_inode(inode);
1305 int ret = 0;
1306
1307 spin_lock(&inode->i_lock);
1308 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1309 inode->i_size = size;
1310 inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1311
1312 /* tell the MDS if we are approaching max_size */
1313 if ((size << 1) >= ci->i_max_size &&
1314 (ci->i_reported_size << 1) < ci->i_max_size)
1315 ret = 1;
1316
1317 spin_unlock(&inode->i_lock);
1318 return ret;
1319 }
1320
1321 /*
1322 * Write back inode data in a worker thread. (This can't be done
1323 * in the message handler context.)
1324 */
1325 void ceph_queue_writeback(struct inode *inode)
1326 {
1327 if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1328 &ceph_inode(inode)->i_wb_work)) {
1329 dout("ceph_queue_writeback %p\n", inode);
1330 igrab(inode);
1331 } else {
1332 dout("ceph_queue_writeback %p failed\n", inode);
1333 }
1334 }
1335
1336 static void ceph_writeback_work(struct work_struct *work)
1337 {
1338 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1339 i_wb_work);
1340 struct inode *inode = &ci->vfs_inode;
1341
1342 dout("writeback %p\n", inode);
1343 filemap_fdatawrite(&inode->i_data);
1344 iput(inode);
1345 }
1346
1347 /*
1348 * queue an async invalidation
1349 */
1350 void ceph_queue_invalidate(struct inode *inode)
1351 {
1352 if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1353 &ceph_inode(inode)->i_pg_inv_work)) {
1354 dout("ceph_queue_invalidate %p\n", inode);
1355 igrab(inode);
1356 } else {
1357 dout("ceph_queue_invalidate %p failed\n", inode);
1358 }
1359 }
1360
1361 /*
1362 * invalidate any pages that are not dirty or under writeback. this
1363 * includes pages that are clean and mapped.
1364 */
1365 static void ceph_invalidate_nondirty_pages(struct address_space *mapping)
1366 {
1367 struct pagevec pvec;
1368 pgoff_t next = 0;
1369 int i;
1370
1371 pagevec_init(&pvec, 0);
1372 while (pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
1373 for (i = 0; i < pagevec_count(&pvec); i++) {
1374 struct page *page = pvec.pages[i];
1375 pgoff_t index;
1376 int skip_page =
1377 (PageDirty(page) || PageWriteback(page));
1378
1379 if (!skip_page)
1380 skip_page = !trylock_page(page);
1381
1382 /*
1383 * We really shouldn't be looking at the ->index of an
1384 * unlocked page. But we're not allowed to lock these
1385 * pages. So we rely upon nobody altering the ->index
1386 * of this (pinned-by-us) page.
1387 */
1388 index = page->index;
1389 if (index > next)
1390 next = index;
1391 next++;
1392
1393 if (skip_page)
1394 continue;
1395
1396 generic_error_remove_page(mapping, page);
1397 unlock_page(page);
1398 }
1399 pagevec_release(&pvec);
1400 cond_resched();
1401 }
1402 }
1403
1404 /*
1405 * Invalidate inode pages in a worker thread. (This can't be done
1406 * in the message handler context.)
1407 */
1408 static void ceph_invalidate_work(struct work_struct *work)
1409 {
1410 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1411 i_pg_inv_work);
1412 struct inode *inode = &ci->vfs_inode;
1413 u32 orig_gen;
1414 int check = 0;
1415
1416 spin_lock(&inode->i_lock);
1417 dout("invalidate_pages %p gen %d revoking %d\n", inode,
1418 ci->i_rdcache_gen, ci->i_rdcache_revoking);
1419 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1420 /* nevermind! */
1421 spin_unlock(&inode->i_lock);
1422 goto out;
1423 }
1424 orig_gen = ci->i_rdcache_gen;
1425 spin_unlock(&inode->i_lock);
1426
1427 ceph_invalidate_nondirty_pages(inode->i_mapping);
1428
1429 spin_lock(&inode->i_lock);
1430 if (orig_gen == ci->i_rdcache_gen &&
1431 orig_gen == ci->i_rdcache_revoking) {
1432 dout("invalidate_pages %p gen %d successful\n", inode,
1433 ci->i_rdcache_gen);
1434 ci->i_rdcache_revoking--;
1435 check = 1;
1436 } else {
1437 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
1438 inode, orig_gen, ci->i_rdcache_gen,
1439 ci->i_rdcache_revoking);
1440 }
1441 spin_unlock(&inode->i_lock);
1442
1443 if (check)
1444 ceph_check_caps(ci, 0, NULL);
1445 out:
1446 iput(inode);
1447 }
1448
1449
1450 /*
1451 * called by trunc_wq; take i_mutex ourselves
1452 *
1453 * We also truncate in a separate thread as well.
1454 */
1455 static void ceph_vmtruncate_work(struct work_struct *work)
1456 {
1457 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1458 i_vmtruncate_work);
1459 struct inode *inode = &ci->vfs_inode;
1460
1461 dout("vmtruncate_work %p\n", inode);
1462 mutex_lock(&inode->i_mutex);
1463 __ceph_do_pending_vmtruncate(inode);
1464 mutex_unlock(&inode->i_mutex);
1465 iput(inode);
1466 }
1467
1468 /*
1469 * Queue an async vmtruncate. If we fail to queue work, we will handle
1470 * the truncation the next time we call __ceph_do_pending_vmtruncate.
1471 */
1472 void ceph_queue_vmtruncate(struct inode *inode)
1473 {
1474 struct ceph_inode_info *ci = ceph_inode(inode);
1475
1476 if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1477 &ci->i_vmtruncate_work)) {
1478 dout("ceph_queue_vmtruncate %p\n", inode);
1479 igrab(inode);
1480 } else {
1481 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1482 inode, ci->i_truncate_pending);
1483 }
1484 }
1485
1486 /*
1487 * called with i_mutex held.
1488 *
1489 * Make sure any pending truncation is applied before doing anything
1490 * that may depend on it.
1491 */
1492 void __ceph_do_pending_vmtruncate(struct inode *inode)
1493 {
1494 struct ceph_inode_info *ci = ceph_inode(inode);
1495 u64 to;
1496 int wrbuffer_refs, wake = 0;
1497
1498 retry:
1499 spin_lock(&inode->i_lock);
1500 if (ci->i_truncate_pending == 0) {
1501 dout("__do_pending_vmtruncate %p none pending\n", inode);
1502 spin_unlock(&inode->i_lock);
1503 return;
1504 }
1505
1506 /*
1507 * make sure any dirty snapped pages are flushed before we
1508 * possibly truncate them.. so write AND block!
1509 */
1510 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1511 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1512 inode);
1513 spin_unlock(&inode->i_lock);
1514 filemap_write_and_wait_range(&inode->i_data, 0,
1515 inode->i_sb->s_maxbytes);
1516 goto retry;
1517 }
1518
1519 to = ci->i_truncate_size;
1520 wrbuffer_refs = ci->i_wrbuffer_ref;
1521 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1522 ci->i_truncate_pending, to);
1523 spin_unlock(&inode->i_lock);
1524
1525 truncate_inode_pages(inode->i_mapping, to);
1526
1527 spin_lock(&inode->i_lock);
1528 ci->i_truncate_pending--;
1529 if (ci->i_truncate_pending == 0)
1530 wake = 1;
1531 spin_unlock(&inode->i_lock);
1532
1533 if (wrbuffer_refs == 0)
1534 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1535 if (wake)
1536 wake_up_all(&ci->i_cap_wq);
1537 }
1538
1539
1540 /*
1541 * symlinks
1542 */
1543 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1544 {
1545 struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1546 nd_set_link(nd, ci->i_symlink);
1547 return NULL;
1548 }
1549
1550 static const struct inode_operations ceph_symlink_iops = {
1551 .readlink = generic_readlink,
1552 .follow_link = ceph_sym_follow_link,
1553 };
1554
1555 /*
1556 * setattr
1557 */
1558 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1559 {
1560 struct inode *inode = dentry->d_inode;
1561 struct ceph_inode_info *ci = ceph_inode(inode);
1562 struct inode *parent_inode = dentry->d_parent->d_inode;
1563 const unsigned int ia_valid = attr->ia_valid;
1564 struct ceph_mds_request *req;
1565 struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1566 int issued;
1567 int release = 0, dirtied = 0;
1568 int mask = 0;
1569 int err = 0;
1570
1571 if (ceph_snap(inode) != CEPH_NOSNAP)
1572 return -EROFS;
1573
1574 __ceph_do_pending_vmtruncate(inode);
1575
1576 err = inode_change_ok(inode, attr);
1577 if (err != 0)
1578 return err;
1579
1580 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1581 USE_AUTH_MDS);
1582 if (IS_ERR(req))
1583 return PTR_ERR(req);
1584
1585 spin_lock(&inode->i_lock);
1586 issued = __ceph_caps_issued(ci, NULL);
1587 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1588
1589 if (ia_valid & ATTR_UID) {
1590 dout("setattr %p uid %d -> %d\n", inode,
1591 inode->i_uid, attr->ia_uid);
1592 if (issued & CEPH_CAP_AUTH_EXCL) {
1593 inode->i_uid = attr->ia_uid;
1594 dirtied |= CEPH_CAP_AUTH_EXCL;
1595 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1596 attr->ia_uid != inode->i_uid) {
1597 req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid);
1598 mask |= CEPH_SETATTR_UID;
1599 release |= CEPH_CAP_AUTH_SHARED;
1600 }
1601 }
1602 if (ia_valid & ATTR_GID) {
1603 dout("setattr %p gid %d -> %d\n", inode,
1604 inode->i_gid, attr->ia_gid);
1605 if (issued & CEPH_CAP_AUTH_EXCL) {
1606 inode->i_gid = attr->ia_gid;
1607 dirtied |= CEPH_CAP_AUTH_EXCL;
1608 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1609 attr->ia_gid != inode->i_gid) {
1610 req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid);
1611 mask |= CEPH_SETATTR_GID;
1612 release |= CEPH_CAP_AUTH_SHARED;
1613 }
1614 }
1615 if (ia_valid & ATTR_MODE) {
1616 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1617 attr->ia_mode);
1618 if (issued & CEPH_CAP_AUTH_EXCL) {
1619 inode->i_mode = attr->ia_mode;
1620 dirtied |= CEPH_CAP_AUTH_EXCL;
1621 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1622 attr->ia_mode != inode->i_mode) {
1623 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1624 mask |= CEPH_SETATTR_MODE;
1625 release |= CEPH_CAP_AUTH_SHARED;
1626 }
1627 }
1628
1629 if (ia_valid & ATTR_ATIME) {
1630 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1631 inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1632 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1633 if (issued & CEPH_CAP_FILE_EXCL) {
1634 ci->i_time_warp_seq++;
1635 inode->i_atime = attr->ia_atime;
1636 dirtied |= CEPH_CAP_FILE_EXCL;
1637 } else if ((issued & CEPH_CAP_FILE_WR) &&
1638 timespec_compare(&inode->i_atime,
1639 &attr->ia_atime) < 0) {
1640 inode->i_atime = attr->ia_atime;
1641 dirtied |= CEPH_CAP_FILE_WR;
1642 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1643 !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1644 ceph_encode_timespec(&req->r_args.setattr.atime,
1645 &attr->ia_atime);
1646 mask |= CEPH_SETATTR_ATIME;
1647 release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1648 CEPH_CAP_FILE_WR;
1649 }
1650 }
1651 if (ia_valid & ATTR_MTIME) {
1652 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1653 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1654 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1655 if (issued & CEPH_CAP_FILE_EXCL) {
1656 ci->i_time_warp_seq++;
1657 inode->i_mtime = attr->ia_mtime;
1658 dirtied |= CEPH_CAP_FILE_EXCL;
1659 } else if ((issued & CEPH_CAP_FILE_WR) &&
1660 timespec_compare(&inode->i_mtime,
1661 &attr->ia_mtime) < 0) {
1662 inode->i_mtime = attr->ia_mtime;
1663 dirtied |= CEPH_CAP_FILE_WR;
1664 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1665 !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1666 ceph_encode_timespec(&req->r_args.setattr.mtime,
1667 &attr->ia_mtime);
1668 mask |= CEPH_SETATTR_MTIME;
1669 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1670 CEPH_CAP_FILE_WR;
1671 }
1672 }
1673 if (ia_valid & ATTR_SIZE) {
1674 dout("setattr %p size %lld -> %lld\n", inode,
1675 inode->i_size, attr->ia_size);
1676 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1677 err = -EINVAL;
1678 goto out;
1679 }
1680 if ((issued & CEPH_CAP_FILE_EXCL) &&
1681 attr->ia_size > inode->i_size) {
1682 inode->i_size = attr->ia_size;
1683 inode->i_blocks =
1684 (attr->ia_size + (1 << 9) - 1) >> 9;
1685 inode->i_ctime = attr->ia_ctime;
1686 ci->i_reported_size = attr->ia_size;
1687 dirtied |= CEPH_CAP_FILE_EXCL;
1688 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1689 attr->ia_size != inode->i_size) {
1690 req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1691 req->r_args.setattr.old_size =
1692 cpu_to_le64(inode->i_size);
1693 mask |= CEPH_SETATTR_SIZE;
1694 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1695 CEPH_CAP_FILE_WR;
1696 }
1697 }
1698
1699 /* these do nothing */
1700 if (ia_valid & ATTR_CTIME) {
1701 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1702 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1703 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1704 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1705 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1706 only ? "ctime only" : "ignored");
1707 inode->i_ctime = attr->ia_ctime;
1708 if (only) {
1709 /*
1710 * if kernel wants to dirty ctime but nothing else,
1711 * we need to choose a cap to dirty under, or do
1712 * a almost-no-op setattr
1713 */
1714 if (issued & CEPH_CAP_AUTH_EXCL)
1715 dirtied |= CEPH_CAP_AUTH_EXCL;
1716 else if (issued & CEPH_CAP_FILE_EXCL)
1717 dirtied |= CEPH_CAP_FILE_EXCL;
1718 else if (issued & CEPH_CAP_XATTR_EXCL)
1719 dirtied |= CEPH_CAP_XATTR_EXCL;
1720 else
1721 mask |= CEPH_SETATTR_CTIME;
1722 }
1723 }
1724 if (ia_valid & ATTR_FILE)
1725 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1726
1727 if (dirtied) {
1728 __ceph_mark_dirty_caps(ci, dirtied);
1729 inode->i_ctime = CURRENT_TIME;
1730 }
1731
1732 release &= issued;
1733 spin_unlock(&inode->i_lock);
1734
1735 if (mask) {
1736 req->r_inode = igrab(inode);
1737 req->r_inode_drop = release;
1738 req->r_args.setattr.mask = cpu_to_le32(mask);
1739 req->r_num_caps = 1;
1740 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1741 }
1742 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1743 ceph_cap_string(dirtied), mask);
1744
1745 ceph_mdsc_put_request(req);
1746 __ceph_do_pending_vmtruncate(inode);
1747 return err;
1748 out:
1749 spin_unlock(&inode->i_lock);
1750 ceph_mdsc_put_request(req);
1751 return err;
1752 }
1753
1754 /*
1755 * Verify that we have a lease on the given mask. If not,
1756 * do a getattr against an mds.
1757 */
1758 int ceph_do_getattr(struct inode *inode, int mask)
1759 {
1760 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
1761 struct ceph_mds_client *mdsc = fsc->mdsc;
1762 struct ceph_mds_request *req;
1763 int err;
1764
1765 if (ceph_snap(inode) == CEPH_SNAPDIR) {
1766 dout("do_getattr inode %p SNAPDIR\n", inode);
1767 return 0;
1768 }
1769
1770 dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode);
1771 if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1772 return 0;
1773
1774 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1775 if (IS_ERR(req))
1776 return PTR_ERR(req);
1777 req->r_inode = igrab(inode);
1778 req->r_num_caps = 1;
1779 req->r_args.getattr.mask = cpu_to_le32(mask);
1780 err = ceph_mdsc_do_request(mdsc, NULL, req);
1781 ceph_mdsc_put_request(req);
1782 dout("do_getattr result=%d\n", err);
1783 return err;
1784 }
1785
1786
1787 /*
1788 * Check inode permissions. We verify we have a valid value for
1789 * the AUTH cap, then call the generic handler.
1790 */
1791 int ceph_permission(struct inode *inode, int mask, unsigned int flags)
1792 {
1793 int err;
1794
1795 if (flags & IPERM_FLAG_RCU)
1796 return -ECHILD;
1797
1798 err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1799
1800 if (!err)
1801 err = generic_permission(inode, mask, flags, NULL);
1802 return err;
1803 }
1804
1805 /*
1806 * Get all attributes. Hopefully somedata we'll have a statlite()
1807 * and can limit the fields we require to be accurate.
1808 */
1809 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1810 struct kstat *stat)
1811 {
1812 struct inode *inode = dentry->d_inode;
1813 struct ceph_inode_info *ci = ceph_inode(inode);
1814 int err;
1815
1816 err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1817 if (!err) {
1818 generic_fillattr(inode, stat);
1819 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);
1820 if (ceph_snap(inode) != CEPH_NOSNAP)
1821 stat->dev = ceph_snap(inode);
1822 else
1823 stat->dev = 0;
1824 if (S_ISDIR(inode->i_mode)) {
1825 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
1826 RBYTES))
1827 stat->size = ci->i_rbytes;
1828 else
1829 stat->size = ci->i_files + ci->i_subdirs;
1830 stat->blocks = 0;
1831 stat->blksize = 65536;
1832 }
1833 }
1834 return err;
1835 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree