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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[deliverable/linux.git] / fs / ceph / inode.c
1 #include "ceph_debug.h"
2
3 #include <linux/module.h>
4 #include <linux/fs.h>
5 #include <linux/smp_lock.h>
6 #include <linux/slab.h>
7 #include <linux/string.h>
8 #include <linux/uaccess.h>
9 #include <linux/kernel.h>
10 #include <linux/namei.h>
11 #include <linux/writeback.h>
12 #include <linux/vmalloc.h>
13 #include <linux/pagevec.h>
14
15 #include "super.h"
16 #include "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 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
40 {
41 struct inode *inode;
42 ino_t t = ceph_vino_to_ino(vino);
43
44 inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
45 if (inode == NULL)
46 return ERR_PTR(-ENOMEM);
47 if (inode->i_state & I_NEW) {
48 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
49 inode, ceph_vinop(inode), (u64)inode->i_ino);
50 unlock_new_inode(inode);
51 }
52
53 dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
54 vino.snap, inode);
55 return inode;
56 }
57
58 /*
59 * get/constuct snapdir inode for a given directory
60 */
61 struct inode *ceph_get_snapdir(struct inode *parent)
62 {
63 struct ceph_vino vino = {
64 .ino = ceph_ino(parent),
65 .snap = CEPH_SNAPDIR,
66 };
67 struct inode *inode = ceph_get_inode(parent->i_sb, vino);
68 struct ceph_inode_info *ci = ceph_inode(inode);
69
70 BUG_ON(!S_ISDIR(parent->i_mode));
71 if (IS_ERR(inode))
72 return ERR_PTR(PTR_ERR(inode));
73 inode->i_mode = parent->i_mode;
74 inode->i_uid = parent->i_uid;
75 inode->i_gid = parent->i_gid;
76 inode->i_op = &ceph_dir_iops;
77 inode->i_fop = &ceph_dir_fops;
78 ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
79 ci->i_rbytes = 0;
80 return inode;
81 }
82
83 const struct inode_operations ceph_file_iops = {
84 .permission = ceph_permission,
85 .setattr = ceph_setattr,
86 .getattr = ceph_getattr,
87 .setxattr = ceph_setxattr,
88 .getxattr = ceph_getxattr,
89 .listxattr = ceph_listxattr,
90 .removexattr = ceph_removexattr,
91 };
92
93
94 /*
95 * We use a 'frag tree' to keep track of the MDS's directory fragments
96 * for a given inode (usually there is just a single fragment). We
97 * need to know when a child frag is delegated to a new MDS, or when
98 * it is flagged as replicated, so we can direct our requests
99 * accordingly.
100 */
101
102 /*
103 * find/create a frag in the tree
104 */
105 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
106 u32 f)
107 {
108 struct rb_node **p;
109 struct rb_node *parent = NULL;
110 struct ceph_inode_frag *frag;
111 int c;
112
113 p = &ci->i_fragtree.rb_node;
114 while (*p) {
115 parent = *p;
116 frag = rb_entry(parent, struct ceph_inode_frag, node);
117 c = ceph_frag_compare(f, frag->frag);
118 if (c < 0)
119 p = &(*p)->rb_left;
120 else if (c > 0)
121 p = &(*p)->rb_right;
122 else
123 return frag;
124 }
125
126 frag = kmalloc(sizeof(*frag), GFP_NOFS);
127 if (!frag) {
128 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
129 "frag %x\n", &ci->vfs_inode,
130 ceph_vinop(&ci->vfs_inode), f);
131 return ERR_PTR(-ENOMEM);
132 }
133 frag->frag = f;
134 frag->split_by = 0;
135 frag->mds = -1;
136 frag->ndist = 0;
137
138 rb_link_node(&frag->node, parent, p);
139 rb_insert_color(&frag->node, &ci->i_fragtree);
140
141 dout("get_or_create_frag added %llx.%llx frag %x\n",
142 ceph_vinop(&ci->vfs_inode), f);
143 return frag;
144 }
145
146 /*
147 * find a specific frag @f
148 */
149 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
150 {
151 struct rb_node *n = ci->i_fragtree.rb_node;
152
153 while (n) {
154 struct ceph_inode_frag *frag =
155 rb_entry(n, struct ceph_inode_frag, node);
156 int c = ceph_frag_compare(f, frag->frag);
157 if (c < 0)
158 n = n->rb_left;
159 else if (c > 0)
160 n = n->rb_right;
161 else
162 return frag;
163 }
164 return NULL;
165 }
166
167 /*
168 * Choose frag containing the given value @v. If @pfrag is
169 * specified, copy the frag delegation info to the caller if
170 * it is present.
171 */
172 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
173 struct ceph_inode_frag *pfrag,
174 int *found)
175 {
176 u32 t = ceph_frag_make(0, 0);
177 struct ceph_inode_frag *frag;
178 unsigned nway, i;
179 u32 n;
180
181 if (found)
182 *found = 0;
183
184 mutex_lock(&ci->i_fragtree_mutex);
185 while (1) {
186 WARN_ON(!ceph_frag_contains_value(t, v));
187 frag = __ceph_find_frag(ci, t);
188 if (!frag)
189 break; /* t is a leaf */
190 if (frag->split_by == 0) {
191 if (pfrag)
192 memcpy(pfrag, frag, sizeof(*pfrag));
193 if (found)
194 *found = 1;
195 break;
196 }
197
198 /* choose child */
199 nway = 1 << frag->split_by;
200 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
201 frag->split_by, nway);
202 for (i = 0; i < nway; i++) {
203 n = ceph_frag_make_child(t, frag->split_by, i);
204 if (ceph_frag_contains_value(n, v)) {
205 t = n;
206 break;
207 }
208 }
209 BUG_ON(i == nway);
210 }
211 dout("choose_frag(%x) = %x\n", v, t);
212
213 mutex_unlock(&ci->i_fragtree_mutex);
214 return t;
215 }
216
217 /*
218 * Process dirfrag (delegation) info from the mds. Include leaf
219 * fragment in tree ONLY if ndist > 0. Otherwise, only
220 * branches/splits are included in i_fragtree)
221 */
222 static int ceph_fill_dirfrag(struct inode *inode,
223 struct ceph_mds_reply_dirfrag *dirinfo)
224 {
225 struct ceph_inode_info *ci = ceph_inode(inode);
226 struct ceph_inode_frag *frag;
227 u32 id = le32_to_cpu(dirinfo->frag);
228 int mds = le32_to_cpu(dirinfo->auth);
229 int ndist = le32_to_cpu(dirinfo->ndist);
230 int i;
231 int err = 0;
232
233 mutex_lock(&ci->i_fragtree_mutex);
234 if (ndist == 0) {
235 /* no delegation info needed. */
236 frag = __ceph_find_frag(ci, id);
237 if (!frag)
238 goto out;
239 if (frag->split_by == 0) {
240 /* tree leaf, remove */
241 dout("fill_dirfrag removed %llx.%llx frag %x"
242 " (no ref)\n", ceph_vinop(inode), id);
243 rb_erase(&frag->node, &ci->i_fragtree);
244 kfree(frag);
245 } else {
246 /* tree branch, keep and clear */
247 dout("fill_dirfrag cleared %llx.%llx frag %x"
248 " referral\n", ceph_vinop(inode), id);
249 frag->mds = -1;
250 frag->ndist = 0;
251 }
252 goto out;
253 }
254
255
256 /* find/add this frag to store mds delegation info */
257 frag = __get_or_create_frag(ci, id);
258 if (IS_ERR(frag)) {
259 /* this is not the end of the world; we can continue
260 with bad/inaccurate delegation info */
261 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
262 ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
263 err = -ENOMEM;
264 goto out;
265 }
266
267 frag->mds = mds;
268 frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
269 for (i = 0; i < frag->ndist; i++)
270 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
271 dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
272 ceph_vinop(inode), frag->frag, frag->ndist);
273
274 out:
275 mutex_unlock(&ci->i_fragtree_mutex);
276 return err;
277 }
278
279
280 /*
281 * initialize a newly allocated inode.
282 */
283 struct inode *ceph_alloc_inode(struct super_block *sb)
284 {
285 struct ceph_inode_info *ci;
286 int i;
287
288 ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
289 if (!ci)
290 return NULL;
291
292 dout("alloc_inode %p\n", &ci->vfs_inode);
293
294 ci->i_version = 0;
295 ci->i_time_warp_seq = 0;
296 ci->i_ceph_flags = 0;
297 ci->i_release_count = 0;
298 ci->i_symlink = NULL;
299
300 ci->i_fragtree = RB_ROOT;
301 mutex_init(&ci->i_fragtree_mutex);
302
303 ci->i_xattrs.blob = NULL;
304 ci->i_xattrs.prealloc_blob = NULL;
305 ci->i_xattrs.dirty = false;
306 ci->i_xattrs.index = RB_ROOT;
307 ci->i_xattrs.count = 0;
308 ci->i_xattrs.names_size = 0;
309 ci->i_xattrs.vals_size = 0;
310 ci->i_xattrs.version = 0;
311 ci->i_xattrs.index_version = 0;
312
313 ci->i_caps = RB_ROOT;
314 ci->i_auth_cap = NULL;
315 ci->i_dirty_caps = 0;
316 ci->i_flushing_caps = 0;
317 INIT_LIST_HEAD(&ci->i_dirty_item);
318 INIT_LIST_HEAD(&ci->i_flushing_item);
319 ci->i_cap_flush_seq = 0;
320 ci->i_cap_flush_last_tid = 0;
321 memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
322 init_waitqueue_head(&ci->i_cap_wq);
323 ci->i_hold_caps_min = 0;
324 ci->i_hold_caps_max = 0;
325 INIT_LIST_HEAD(&ci->i_cap_delay_list);
326 ci->i_cap_exporting_mds = 0;
327 ci->i_cap_exporting_mseq = 0;
328 ci->i_cap_exporting_issued = 0;
329 INIT_LIST_HEAD(&ci->i_cap_snaps);
330 ci->i_head_snapc = NULL;
331 ci->i_snap_caps = 0;
332
333 for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
334 ci->i_nr_by_mode[i] = 0;
335
336 ci->i_truncate_seq = 0;
337 ci->i_truncate_size = 0;
338 ci->i_truncate_pending = 0;
339
340 ci->i_max_size = 0;
341 ci->i_reported_size = 0;
342 ci->i_wanted_max_size = 0;
343 ci->i_requested_max_size = 0;
344
345 ci->i_pin_ref = 0;
346 ci->i_rd_ref = 0;
347 ci->i_rdcache_ref = 0;
348 ci->i_wr_ref = 0;
349 ci->i_wrbuffer_ref = 0;
350 ci->i_wrbuffer_ref_head = 0;
351 ci->i_shared_gen = 0;
352 ci->i_rdcache_gen = 0;
353 ci->i_rdcache_revoking = 0;
354
355 INIT_LIST_HEAD(&ci->i_unsafe_writes);
356 INIT_LIST_HEAD(&ci->i_unsafe_dirops);
357 spin_lock_init(&ci->i_unsafe_lock);
358
359 ci->i_snap_realm = NULL;
360 INIT_LIST_HEAD(&ci->i_snap_realm_item);
361 INIT_LIST_HEAD(&ci->i_snap_flush_item);
362
363 INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
364 INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
365
366 INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
367
368 return &ci->vfs_inode;
369 }
370
371 void ceph_destroy_inode(struct inode *inode)
372 {
373 struct ceph_inode_info *ci = ceph_inode(inode);
374 struct ceph_inode_frag *frag;
375 struct rb_node *n;
376
377 dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
378
379 ceph_queue_caps_release(inode);
380
381 kfree(ci->i_symlink);
382 while ((n = rb_first(&ci->i_fragtree)) != NULL) {
383 frag = rb_entry(n, struct ceph_inode_frag, node);
384 rb_erase(n, &ci->i_fragtree);
385 kfree(frag);
386 }
387
388 __ceph_destroy_xattrs(ci);
389 if (ci->i_xattrs.blob)
390 ceph_buffer_put(ci->i_xattrs.blob);
391 if (ci->i_xattrs.prealloc_blob)
392 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
393
394 kmem_cache_free(ceph_inode_cachep, ci);
395 }
396
397
398 /*
399 * Helpers to fill in size, ctime, mtime, and atime. We have to be
400 * careful because either the client or MDS may have more up to date
401 * info, depending on which capabilities are held, and whether
402 * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime
403 * and size are monotonically increasing, except when utimes() or
404 * truncate() increments the corresponding _seq values.)
405 */
406 int ceph_fill_file_size(struct inode *inode, int issued,
407 u32 truncate_seq, u64 truncate_size, u64 size)
408 {
409 struct ceph_inode_info *ci = ceph_inode(inode);
410 int queue_trunc = 0;
411
412 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
413 (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
414 dout("size %lld -> %llu\n", inode->i_size, size);
415 inode->i_size = size;
416 inode->i_blocks = (size + (1<<9) - 1) >> 9;
417 ci->i_reported_size = size;
418 if (truncate_seq != ci->i_truncate_seq) {
419 dout("truncate_seq %u -> %u\n",
420 ci->i_truncate_seq, truncate_seq);
421 ci->i_truncate_seq = truncate_seq;
422 /*
423 * If we hold relevant caps, or in the case where we're
424 * not the only client referencing this file and we
425 * don't hold those caps, then we need to check whether
426 * the file is either opened or mmaped
427 */
428 if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_RD|
429 CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER|
430 CEPH_CAP_FILE_EXCL)) ||
431 mapping_mapped(inode->i_mapping) ||
432 __ceph_caps_file_wanted(ci)) {
433 ci->i_truncate_pending++;
434 queue_trunc = 1;
435 }
436 }
437 }
438 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
439 ci->i_truncate_size != truncate_size) {
440 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
441 truncate_size);
442 ci->i_truncate_size = truncate_size;
443 }
444 return queue_trunc;
445 }
446
447 void ceph_fill_file_time(struct inode *inode, int issued,
448 u64 time_warp_seq, struct timespec *ctime,
449 struct timespec *mtime, struct timespec *atime)
450 {
451 struct ceph_inode_info *ci = ceph_inode(inode);
452 int warn = 0;
453
454 if (issued & (CEPH_CAP_FILE_EXCL|
455 CEPH_CAP_FILE_WR|
456 CEPH_CAP_FILE_BUFFER)) {
457 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
458 dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
459 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
460 ctime->tv_sec, ctime->tv_nsec);
461 inode->i_ctime = *ctime;
462 }
463 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
464 /* the MDS did a utimes() */
465 dout("mtime %ld.%09ld -> %ld.%09ld "
466 "tw %d -> %d\n",
467 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
468 mtime->tv_sec, mtime->tv_nsec,
469 ci->i_time_warp_seq, (int)time_warp_seq);
470
471 inode->i_mtime = *mtime;
472 inode->i_atime = *atime;
473 ci->i_time_warp_seq = time_warp_seq;
474 } else if (time_warp_seq == ci->i_time_warp_seq) {
475 /* nobody did utimes(); take the max */
476 if (timespec_compare(mtime, &inode->i_mtime) > 0) {
477 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
478 inode->i_mtime.tv_sec,
479 inode->i_mtime.tv_nsec,
480 mtime->tv_sec, mtime->tv_nsec);
481 inode->i_mtime = *mtime;
482 }
483 if (timespec_compare(atime, &inode->i_atime) > 0) {
484 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
485 inode->i_atime.tv_sec,
486 inode->i_atime.tv_nsec,
487 atime->tv_sec, atime->tv_nsec);
488 inode->i_atime = *atime;
489 }
490 } else if (issued & CEPH_CAP_FILE_EXCL) {
491 /* we did a utimes(); ignore mds values */
492 } else {
493 warn = 1;
494 }
495 } else {
496 /* we have no write caps; whatever the MDS says is true */
497 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
498 inode->i_ctime = *ctime;
499 inode->i_mtime = *mtime;
500 inode->i_atime = *atime;
501 ci->i_time_warp_seq = time_warp_seq;
502 } else {
503 warn = 1;
504 }
505 }
506 if (warn) /* time_warp_seq shouldn't go backwards */
507 dout("%p mds time_warp_seq %llu < %u\n",
508 inode, time_warp_seq, ci->i_time_warp_seq);
509 }
510
511 /*
512 * Populate an inode based on info from mds. May be called on new or
513 * existing inodes.
514 */
515 static int fill_inode(struct inode *inode,
516 struct ceph_mds_reply_info_in *iinfo,
517 struct ceph_mds_reply_dirfrag *dirinfo,
518 struct ceph_mds_session *session,
519 unsigned long ttl_from, int cap_fmode,
520 struct ceph_cap_reservation *caps_reservation)
521 {
522 struct ceph_mds_reply_inode *info = iinfo->in;
523 struct ceph_inode_info *ci = ceph_inode(inode);
524 int i;
525 int issued, implemented;
526 struct timespec mtime, atime, ctime;
527 u32 nsplits;
528 struct ceph_buffer *xattr_blob = NULL;
529 int err = 0;
530 int queue_trunc = 0;
531
532 dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
533 inode, ceph_vinop(inode), le64_to_cpu(info->version),
534 ci->i_version);
535
536 /*
537 * prealloc xattr data, if it looks like we'll need it. only
538 * if len > 4 (meaning there are actually xattrs; the first 4
539 * bytes are the xattr count).
540 */
541 if (iinfo->xattr_len > 4) {
542 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
543 if (!xattr_blob)
544 pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
545 iinfo->xattr_len);
546 }
547
548 spin_lock(&inode->i_lock);
549
550 /*
551 * provided version will be odd if inode value is projected,
552 * even if stable. skip the update if we have a newer info
553 * (e.g., due to inode info racing form multiple MDSs), or if
554 * we are getting projected (unstable) inode info.
555 */
556 if (le64_to_cpu(info->version) > 0 &&
557 (ci->i_version & ~1) > le64_to_cpu(info->version))
558 goto no_change;
559
560 issued = __ceph_caps_issued(ci, &implemented);
561 issued |= implemented | __ceph_caps_dirty(ci);
562
563 /* update inode */
564 ci->i_version = le64_to_cpu(info->version);
565 inode->i_version++;
566 inode->i_rdev = le32_to_cpu(info->rdev);
567
568 if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
569 inode->i_mode = le32_to_cpu(info->mode);
570 inode->i_uid = le32_to_cpu(info->uid);
571 inode->i_gid = le32_to_cpu(info->gid);
572 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
573 inode->i_uid, inode->i_gid);
574 }
575
576 if ((issued & CEPH_CAP_LINK_EXCL) == 0)
577 inode->i_nlink = le32_to_cpu(info->nlink);
578
579 /* be careful with mtime, atime, size */
580 ceph_decode_timespec(&atime, &info->atime);
581 ceph_decode_timespec(&mtime, &info->mtime);
582 ceph_decode_timespec(&ctime, &info->ctime);
583 queue_trunc = ceph_fill_file_size(inode, issued,
584 le32_to_cpu(info->truncate_seq),
585 le64_to_cpu(info->truncate_size),
586 le64_to_cpu(info->size));
587 ceph_fill_file_time(inode, issued,
588 le32_to_cpu(info->time_warp_seq),
589 &ctime, &mtime, &atime);
590
591 ci->i_max_size = le64_to_cpu(info->max_size);
592 ci->i_layout = info->layout;
593 inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
594
595 /* xattrs */
596 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
597 if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
598 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
599 if (ci->i_xattrs.blob)
600 ceph_buffer_put(ci->i_xattrs.blob);
601 ci->i_xattrs.blob = xattr_blob;
602 if (xattr_blob)
603 memcpy(ci->i_xattrs.blob->vec.iov_base,
604 iinfo->xattr_data, iinfo->xattr_len);
605 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
606 }
607
608 inode->i_mapping->a_ops = &ceph_aops;
609 inode->i_mapping->backing_dev_info =
610 &ceph_client(inode->i_sb)->backing_dev_info;
611
612 switch (inode->i_mode & S_IFMT) {
613 case S_IFIFO:
614 case S_IFBLK:
615 case S_IFCHR:
616 case S_IFSOCK:
617 init_special_inode(inode, inode->i_mode, inode->i_rdev);
618 inode->i_op = &ceph_file_iops;
619 break;
620 case S_IFREG:
621 inode->i_op = &ceph_file_iops;
622 inode->i_fop = &ceph_file_fops;
623 break;
624 case S_IFLNK:
625 inode->i_op = &ceph_symlink_iops;
626 if (!ci->i_symlink) {
627 int symlen = iinfo->symlink_len;
628 char *sym;
629
630 BUG_ON(symlen != inode->i_size);
631 spin_unlock(&inode->i_lock);
632
633 err = -ENOMEM;
634 sym = kmalloc(symlen+1, GFP_NOFS);
635 if (!sym)
636 goto out;
637 memcpy(sym, iinfo->symlink, symlen);
638 sym[symlen] = 0;
639
640 spin_lock(&inode->i_lock);
641 if (!ci->i_symlink)
642 ci->i_symlink = sym;
643 else
644 kfree(sym); /* lost a race */
645 }
646 break;
647 case S_IFDIR:
648 inode->i_op = &ceph_dir_iops;
649 inode->i_fop = &ceph_dir_fops;
650
651 ci->i_files = le64_to_cpu(info->files);
652 ci->i_subdirs = le64_to_cpu(info->subdirs);
653 ci->i_rbytes = le64_to_cpu(info->rbytes);
654 ci->i_rfiles = le64_to_cpu(info->rfiles);
655 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
656 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
657
658 /* set dir completion flag? */
659 if (ci->i_files == 0 && ci->i_subdirs == 0 &&
660 ceph_snap(inode) == CEPH_NOSNAP &&
661 (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED)) {
662 dout(" marking %p complete (empty)\n", inode);
663 ci->i_ceph_flags |= CEPH_I_COMPLETE;
664 ci->i_max_offset = 2;
665 }
666
667 /* it may be better to set st_size in getattr instead? */
668 if (ceph_test_opt(ceph_client(inode->i_sb), RBYTES))
669 inode->i_size = ci->i_rbytes;
670 break;
671 default:
672 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
673 ceph_vinop(inode), inode->i_mode);
674 }
675
676 no_change:
677 spin_unlock(&inode->i_lock);
678
679 /* queue truncate if we saw i_size decrease */
680 if (queue_trunc)
681 ceph_queue_vmtruncate(inode);
682
683 /* populate frag tree */
684 /* FIXME: move me up, if/when version reflects fragtree changes */
685 nsplits = le32_to_cpu(info->fragtree.nsplits);
686 mutex_lock(&ci->i_fragtree_mutex);
687 for (i = 0; i < nsplits; i++) {
688 u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
689 struct ceph_inode_frag *frag = __get_or_create_frag(ci, id);
690
691 if (IS_ERR(frag))
692 continue;
693 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
694 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
695 }
696 mutex_unlock(&ci->i_fragtree_mutex);
697
698 /* were we issued a capability? */
699 if (info->cap.caps) {
700 if (ceph_snap(inode) == CEPH_NOSNAP) {
701 ceph_add_cap(inode, session,
702 le64_to_cpu(info->cap.cap_id),
703 cap_fmode,
704 le32_to_cpu(info->cap.caps),
705 le32_to_cpu(info->cap.wanted),
706 le32_to_cpu(info->cap.seq),
707 le32_to_cpu(info->cap.mseq),
708 le64_to_cpu(info->cap.realm),
709 info->cap.flags,
710 caps_reservation);
711 } else {
712 spin_lock(&inode->i_lock);
713 dout(" %p got snap_caps %s\n", inode,
714 ceph_cap_string(le32_to_cpu(info->cap.caps)));
715 ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
716 if (cap_fmode >= 0)
717 __ceph_get_fmode(ci, cap_fmode);
718 spin_unlock(&inode->i_lock);
719 }
720 }
721
722 /* update delegation info? */
723 if (dirinfo)
724 ceph_fill_dirfrag(inode, dirinfo);
725
726 err = 0;
727
728 out:
729 if (xattr_blob)
730 ceph_buffer_put(xattr_blob);
731 return err;
732 }
733
734 /*
735 * caller should hold session s_mutex.
736 */
737 static void update_dentry_lease(struct dentry *dentry,
738 struct ceph_mds_reply_lease *lease,
739 struct ceph_mds_session *session,
740 unsigned long from_time)
741 {
742 struct ceph_dentry_info *di = ceph_dentry(dentry);
743 long unsigned duration = le32_to_cpu(lease->duration_ms);
744 long unsigned ttl = from_time + (duration * HZ) / 1000;
745 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
746 struct inode *dir;
747
748 /* only track leases on regular dentries */
749 if (dentry->d_op != &ceph_dentry_ops)
750 return;
751
752 spin_lock(&dentry->d_lock);
753 dout("update_dentry_lease %p mask %d duration %lu ms ttl %lu\n",
754 dentry, le16_to_cpu(lease->mask), duration, ttl);
755
756 /* make lease_rdcache_gen match directory */
757 dir = dentry->d_parent->d_inode;
758 di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
759
760 if (lease->mask == 0)
761 goto out_unlock;
762
763 if (di->lease_gen == session->s_cap_gen &&
764 time_before(ttl, dentry->d_time))
765 goto out_unlock; /* we already have a newer lease. */
766
767 if (di->lease_session && di->lease_session != session)
768 goto out_unlock;
769
770 ceph_dentry_lru_touch(dentry);
771
772 if (!di->lease_session)
773 di->lease_session = ceph_get_mds_session(session);
774 di->lease_gen = session->s_cap_gen;
775 di->lease_seq = le32_to_cpu(lease->seq);
776 di->lease_renew_after = half_ttl;
777 di->lease_renew_from = 0;
778 dentry->d_time = ttl;
779 out_unlock:
780 spin_unlock(&dentry->d_lock);
781 return;
782 }
783
784 /*
785 * splice a dentry to an inode.
786 * caller must hold directory i_mutex for this to be safe.
787 *
788 * we will only rehash the resulting dentry if @prehash is
789 * true; @prehash will be set to false (for the benefit of
790 * the caller) if we fail.
791 */
792 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
793 bool *prehash)
794 {
795 struct dentry *realdn;
796
797 /* dn must be unhashed */
798 if (!d_unhashed(dn))
799 d_drop(dn);
800 realdn = d_materialise_unique(dn, in);
801 if (IS_ERR(realdn)) {
802 pr_err("splice_dentry error %p inode %p ino %llx.%llx\n",
803 dn, in, ceph_vinop(in));
804 if (prehash)
805 *prehash = false; /* don't rehash on error */
806 dn = realdn; /* note realdn contains the error */
807 goto out;
808 } else if (realdn) {
809 dout("dn %p (%d) spliced with %p (%d) "
810 "inode %p ino %llx.%llx\n",
811 dn, atomic_read(&dn->d_count),
812 realdn, atomic_read(&realdn->d_count),
813 realdn->d_inode, ceph_vinop(realdn->d_inode));
814 dput(dn);
815 dn = realdn;
816 } else {
817 BUG_ON(!ceph_dentry(dn));
818
819 dout("dn %p attached to %p ino %llx.%llx\n",
820 dn, dn->d_inode, ceph_vinop(dn->d_inode));
821 }
822 if ((!prehash || *prehash) && d_unhashed(dn))
823 d_rehash(dn);
824 out:
825 return dn;
826 }
827
828 /*
829 * Set dentry's directory position based on the current dir's max, and
830 * order it in d_subdirs, so that dcache_readdir behaves.
831 */
832 static void ceph_set_dentry_offset(struct dentry *dn)
833 {
834 struct dentry *dir = dn->d_parent;
835 struct inode *inode = dn->d_parent->d_inode;
836 struct ceph_dentry_info *di;
837
838 BUG_ON(!inode);
839
840 di = ceph_dentry(dn);
841
842 spin_lock(&inode->i_lock);
843 di->offset = ceph_inode(inode)->i_max_offset++;
844 spin_unlock(&inode->i_lock);
845
846 spin_lock(&dcache_lock);
847 spin_lock(&dn->d_lock);
848 list_move_tail(&dir->d_subdirs, &dn->d_u.d_child);
849 dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
850 dn->d_u.d_child.prev, dn->d_u.d_child.next);
851 spin_unlock(&dn->d_lock);
852 spin_unlock(&dcache_lock);
853 }
854
855 /*
856 * Incorporate results into the local cache. This is either just
857 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
858 * after a lookup).
859 *
860 * A reply may contain
861 * a directory inode along with a dentry.
862 * and/or a target inode
863 *
864 * Called with snap_rwsem (read).
865 */
866 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
867 struct ceph_mds_session *session)
868 {
869 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
870 struct inode *in = NULL;
871 struct ceph_mds_reply_inode *ininfo;
872 struct ceph_vino vino;
873 int i = 0;
874 int err = 0;
875
876 dout("fill_trace %p is_dentry %d is_target %d\n", req,
877 rinfo->head->is_dentry, rinfo->head->is_target);
878
879 #if 0
880 /*
881 * Debugging hook:
882 *
883 * If we resend completed ops to a recovering mds, we get no
884 * trace. Since that is very rare, pretend this is the case
885 * to ensure the 'no trace' handlers in the callers behave.
886 *
887 * Fill in inodes unconditionally to avoid breaking cap
888 * invariants.
889 */
890 if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
891 pr_info("fill_trace faking empty trace on %lld %s\n",
892 req->r_tid, ceph_mds_op_name(rinfo->head->op));
893 if (rinfo->head->is_dentry) {
894 rinfo->head->is_dentry = 0;
895 err = fill_inode(req->r_locked_dir,
896 &rinfo->diri, rinfo->dirfrag,
897 session, req->r_request_started, -1);
898 }
899 if (rinfo->head->is_target) {
900 rinfo->head->is_target = 0;
901 ininfo = rinfo->targeti.in;
902 vino.ino = le64_to_cpu(ininfo->ino);
903 vino.snap = le64_to_cpu(ininfo->snapid);
904 in = ceph_get_inode(sb, vino);
905 err = fill_inode(in, &rinfo->targeti, NULL,
906 session, req->r_request_started,
907 req->r_fmode);
908 iput(in);
909 }
910 }
911 #endif
912
913 if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
914 dout("fill_trace reply is empty!\n");
915 if (rinfo->head->result == 0 && req->r_locked_dir) {
916 struct ceph_inode_info *ci =
917 ceph_inode(req->r_locked_dir);
918 dout(" clearing %p complete (empty trace)\n",
919 req->r_locked_dir);
920 ci->i_ceph_flags &= ~CEPH_I_COMPLETE;
921 ci->i_release_count++;
922 }
923 return 0;
924 }
925
926 if (rinfo->head->is_dentry) {
927 struct inode *dir = req->r_locked_dir;
928
929 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
930 session, req->r_request_started, -1,
931 &req->r_caps_reservation);
932 if (err < 0)
933 return err;
934 }
935
936 if (rinfo->head->is_dentry && !req->r_aborted) {
937 /*
938 * lookup link rename : null -> possibly existing inode
939 * mknod symlink mkdir : null -> new inode
940 * unlink : linked -> null
941 */
942 struct inode *dir = req->r_locked_dir;
943 struct dentry *dn = req->r_dentry;
944 bool have_dir_cap, have_lease;
945
946 BUG_ON(!dn);
947 BUG_ON(!dir);
948 BUG_ON(dn->d_parent->d_inode != dir);
949 BUG_ON(ceph_ino(dir) !=
950 le64_to_cpu(rinfo->diri.in->ino));
951 BUG_ON(ceph_snap(dir) !=
952 le64_to_cpu(rinfo->diri.in->snapid));
953
954 /* do we have a lease on the whole dir? */
955 have_dir_cap =
956 (le32_to_cpu(rinfo->diri.in->cap.caps) &
957 CEPH_CAP_FILE_SHARED);
958
959 /* do we have a dn lease? */
960 have_lease = have_dir_cap ||
961 (le16_to_cpu(rinfo->dlease->mask) &
962 CEPH_LOCK_DN);
963
964 if (!have_lease)
965 dout("fill_trace no dentry lease or dir cap\n");
966
967 /* rename? */
968 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
969 dout(" src %p '%.*s' dst %p '%.*s'\n",
970 req->r_old_dentry,
971 req->r_old_dentry->d_name.len,
972 req->r_old_dentry->d_name.name,
973 dn, dn->d_name.len, dn->d_name.name);
974 dout("fill_trace doing d_move %p -> %p\n",
975 req->r_old_dentry, dn);
976 d_move(req->r_old_dentry, dn);
977 dout(" src %p '%.*s' dst %p '%.*s'\n",
978 req->r_old_dentry,
979 req->r_old_dentry->d_name.len,
980 req->r_old_dentry->d_name.name,
981 dn, dn->d_name.len, dn->d_name.name);
982 /* ensure target dentry is invalidated, despite
983 rehashing bug in vfs_rename_dir */
984 dn->d_time = jiffies;
985 ceph_dentry(dn)->lease_shared_gen = 0;
986 /* take overwritten dentry's readdir offset */
987 ceph_dentry(req->r_old_dentry)->offset =
988 ceph_dentry(dn)->offset;
989 dn = req->r_old_dentry; /* use old_dentry */
990 in = dn->d_inode;
991 }
992
993 /* null dentry? */
994 if (!rinfo->head->is_target) {
995 dout("fill_trace null dentry\n");
996 if (dn->d_inode) {
997 dout("d_delete %p\n", dn);
998 d_delete(dn);
999 } else {
1000 dout("d_instantiate %p NULL\n", dn);
1001 d_instantiate(dn, NULL);
1002 if (have_lease && d_unhashed(dn))
1003 d_rehash(dn);
1004 update_dentry_lease(dn, rinfo->dlease,
1005 session,
1006 req->r_request_started);
1007 }
1008 goto done;
1009 }
1010
1011 /* attach proper inode */
1012 ininfo = rinfo->targeti.in;
1013 vino.ino = le64_to_cpu(ininfo->ino);
1014 vino.snap = le64_to_cpu(ininfo->snapid);
1015 if (!dn->d_inode) {
1016 in = ceph_get_inode(sb, vino);
1017 if (IS_ERR(in)) {
1018 pr_err("fill_trace bad get_inode "
1019 "%llx.%llx\n", vino.ino, vino.snap);
1020 err = PTR_ERR(in);
1021 d_delete(dn);
1022 goto done;
1023 }
1024 dn = splice_dentry(dn, in, &have_lease);
1025 if (IS_ERR(dn)) {
1026 err = PTR_ERR(dn);
1027 goto done;
1028 }
1029 req->r_dentry = dn; /* may have spliced */
1030 ceph_set_dentry_offset(dn);
1031 igrab(in);
1032 } else if (ceph_ino(in) == vino.ino &&
1033 ceph_snap(in) == vino.snap) {
1034 igrab(in);
1035 } else {
1036 dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1037 dn, in, ceph_ino(in), ceph_snap(in),
1038 vino.ino, vino.snap);
1039 have_lease = false;
1040 in = NULL;
1041 }
1042
1043 if (have_lease)
1044 update_dentry_lease(dn, rinfo->dlease, session,
1045 req->r_request_started);
1046 dout(" final dn %p\n", dn);
1047 i++;
1048 } else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1049 req->r_op == CEPH_MDS_OP_MKSNAP) {
1050 struct dentry *dn = req->r_dentry;
1051
1052 /* fill out a snapdir LOOKUPSNAP dentry */
1053 BUG_ON(!dn);
1054 BUG_ON(!req->r_locked_dir);
1055 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1056 ininfo = rinfo->targeti.in;
1057 vino.ino = le64_to_cpu(ininfo->ino);
1058 vino.snap = le64_to_cpu(ininfo->snapid);
1059 in = ceph_get_inode(sb, vino);
1060 if (IS_ERR(in)) {
1061 pr_err("fill_inode get_inode badness %llx.%llx\n",
1062 vino.ino, vino.snap);
1063 err = PTR_ERR(in);
1064 d_delete(dn);
1065 goto done;
1066 }
1067 dout(" linking snapped dir %p to dn %p\n", in, dn);
1068 dn = splice_dentry(dn, in, NULL);
1069 if (IS_ERR(dn)) {
1070 err = PTR_ERR(dn);
1071 goto done;
1072 }
1073 ceph_set_dentry_offset(dn);
1074 req->r_dentry = dn; /* may have spliced */
1075 igrab(in);
1076 rinfo->head->is_dentry = 1; /* fool notrace handlers */
1077 }
1078
1079 if (rinfo->head->is_target) {
1080 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1081 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1082
1083 if (in == NULL || ceph_ino(in) != vino.ino ||
1084 ceph_snap(in) != vino.snap) {
1085 in = ceph_get_inode(sb, vino);
1086 if (IS_ERR(in)) {
1087 err = PTR_ERR(in);
1088 goto done;
1089 }
1090 }
1091 req->r_target_inode = in;
1092
1093 err = fill_inode(in,
1094 &rinfo->targeti, NULL,
1095 session, req->r_request_started,
1096 (le32_to_cpu(rinfo->head->result) == 0) ?
1097 req->r_fmode : -1,
1098 &req->r_caps_reservation);
1099 if (err < 0) {
1100 pr_err("fill_inode badness %p %llx.%llx\n",
1101 in, ceph_vinop(in));
1102 goto done;
1103 }
1104 }
1105
1106 done:
1107 dout("fill_trace done err=%d\n", err);
1108 return err;
1109 }
1110
1111 /*
1112 * Prepopulate our cache with readdir results, leases, etc.
1113 */
1114 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1115 struct ceph_mds_session *session)
1116 {
1117 struct dentry *parent = req->r_dentry;
1118 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1119 struct qstr dname;
1120 struct dentry *dn;
1121 struct inode *in;
1122 int err = 0, i;
1123 struct inode *snapdir = NULL;
1124 struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1125 u64 frag = le32_to_cpu(rhead->args.readdir.frag);
1126 struct ceph_dentry_info *di;
1127
1128 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1129 snapdir = ceph_get_snapdir(parent->d_inode);
1130 parent = d_find_alias(snapdir);
1131 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1132 rinfo->dir_nr, parent);
1133 } else {
1134 dout("readdir_prepopulate %d items under dn %p\n",
1135 rinfo->dir_nr, parent);
1136 if (rinfo->dir_dir)
1137 ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1138 }
1139
1140 for (i = 0; i < rinfo->dir_nr; i++) {
1141 struct ceph_vino vino;
1142
1143 dname.name = rinfo->dir_dname[i];
1144 dname.len = rinfo->dir_dname_len[i];
1145 dname.hash = full_name_hash(dname.name, dname.len);
1146
1147 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1148 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1149
1150 retry_lookup:
1151 dn = d_lookup(parent, &dname);
1152 dout("d_lookup on parent=%p name=%.*s got %p\n",
1153 parent, dname.len, dname.name, dn);
1154
1155 if (!dn) {
1156 dn = d_alloc(parent, &dname);
1157 dout("d_alloc %p '%.*s' = %p\n", parent,
1158 dname.len, dname.name, dn);
1159 if (dn == NULL) {
1160 dout("d_alloc badness\n");
1161 err = -ENOMEM;
1162 goto out;
1163 }
1164 err = ceph_init_dentry(dn);
1165 if (err < 0)
1166 goto out;
1167 } else if (dn->d_inode &&
1168 (ceph_ino(dn->d_inode) != vino.ino ||
1169 ceph_snap(dn->d_inode) != vino.snap)) {
1170 dout(" dn %p points to wrong inode %p\n",
1171 dn, dn->d_inode);
1172 d_delete(dn);
1173 dput(dn);
1174 goto retry_lookup;
1175 } else {
1176 /* reorder parent's d_subdirs */
1177 spin_lock(&dcache_lock);
1178 spin_lock(&dn->d_lock);
1179 list_move(&dn->d_u.d_child, &parent->d_subdirs);
1180 spin_unlock(&dn->d_lock);
1181 spin_unlock(&dcache_lock);
1182 }
1183
1184 di = dn->d_fsdata;
1185 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1186
1187 /* inode */
1188 if (dn->d_inode) {
1189 in = dn->d_inode;
1190 } else {
1191 in = ceph_get_inode(parent->d_sb, vino);
1192 if (in == NULL) {
1193 dout("new_inode badness\n");
1194 d_delete(dn);
1195 dput(dn);
1196 err = -ENOMEM;
1197 goto out;
1198 }
1199 dn = splice_dentry(dn, in, NULL);
1200 }
1201
1202 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1203 req->r_request_started, -1,
1204 &req->r_caps_reservation) < 0) {
1205 pr_err("fill_inode badness on %p\n", in);
1206 dput(dn);
1207 continue;
1208 }
1209 update_dentry_lease(dn, rinfo->dir_dlease[i],
1210 req->r_session, req->r_request_started);
1211 dput(dn);
1212 }
1213 req->r_did_prepopulate = true;
1214
1215 out:
1216 if (snapdir) {
1217 iput(snapdir);
1218 dput(parent);
1219 }
1220 dout("readdir_prepopulate done\n");
1221 return err;
1222 }
1223
1224 int ceph_inode_set_size(struct inode *inode, loff_t size)
1225 {
1226 struct ceph_inode_info *ci = ceph_inode(inode);
1227 int ret = 0;
1228
1229 spin_lock(&inode->i_lock);
1230 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1231 inode->i_size = size;
1232 inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1233
1234 /* tell the MDS if we are approaching max_size */
1235 if ((size << 1) >= ci->i_max_size &&
1236 (ci->i_reported_size << 1) < ci->i_max_size)
1237 ret = 1;
1238
1239 spin_unlock(&inode->i_lock);
1240 return ret;
1241 }
1242
1243 /*
1244 * Write back inode data in a worker thread. (This can't be done
1245 * in the message handler context.)
1246 */
1247 void ceph_queue_writeback(struct inode *inode)
1248 {
1249 if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1250 &ceph_inode(inode)->i_wb_work)) {
1251 dout("ceph_queue_writeback %p\n", inode);
1252 igrab(inode);
1253 } else {
1254 dout("ceph_queue_writeback %p failed\n", inode);
1255 }
1256 }
1257
1258 static void ceph_writeback_work(struct work_struct *work)
1259 {
1260 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1261 i_wb_work);
1262 struct inode *inode = &ci->vfs_inode;
1263
1264 dout("writeback %p\n", inode);
1265 filemap_fdatawrite(&inode->i_data);
1266 iput(inode);
1267 }
1268
1269 /*
1270 * queue an async invalidation
1271 */
1272 void ceph_queue_invalidate(struct inode *inode)
1273 {
1274 if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1275 &ceph_inode(inode)->i_pg_inv_work)) {
1276 dout("ceph_queue_invalidate %p\n", inode);
1277 igrab(inode);
1278 } else {
1279 dout("ceph_queue_invalidate %p failed\n", inode);
1280 }
1281 }
1282
1283 /*
1284 * invalidate any pages that are not dirty or under writeback. this
1285 * includes pages that are clean and mapped.
1286 */
1287 static void ceph_invalidate_nondirty_pages(struct address_space *mapping)
1288 {
1289 struct pagevec pvec;
1290 pgoff_t next = 0;
1291 int i;
1292
1293 pagevec_init(&pvec, 0);
1294 while (pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
1295 for (i = 0; i < pagevec_count(&pvec); i++) {
1296 struct page *page = pvec.pages[i];
1297 pgoff_t index;
1298 int skip_page =
1299 (PageDirty(page) || PageWriteback(page));
1300
1301 if (!skip_page)
1302 skip_page = !trylock_page(page);
1303
1304 /*
1305 * We really shouldn't be looking at the ->index of an
1306 * unlocked page. But we're not allowed to lock these
1307 * pages. So we rely upon nobody altering the ->index
1308 * of this (pinned-by-us) page.
1309 */
1310 index = page->index;
1311 if (index > next)
1312 next = index;
1313 next++;
1314
1315 if (skip_page)
1316 continue;
1317
1318 generic_error_remove_page(mapping, page);
1319 unlock_page(page);
1320 }
1321 pagevec_release(&pvec);
1322 cond_resched();
1323 }
1324 }
1325
1326 /*
1327 * Invalidate inode pages in a worker thread. (This can't be done
1328 * in the message handler context.)
1329 */
1330 static void ceph_invalidate_work(struct work_struct *work)
1331 {
1332 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1333 i_pg_inv_work);
1334 struct inode *inode = &ci->vfs_inode;
1335 u32 orig_gen;
1336 int check = 0;
1337
1338 spin_lock(&inode->i_lock);
1339 dout("invalidate_pages %p gen %d revoking %d\n", inode,
1340 ci->i_rdcache_gen, ci->i_rdcache_revoking);
1341 if (ci->i_rdcache_gen == 0 ||
1342 ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1343 BUG_ON(ci->i_rdcache_revoking > ci->i_rdcache_gen);
1344 /* nevermind! */
1345 ci->i_rdcache_revoking = 0;
1346 spin_unlock(&inode->i_lock);
1347 goto out;
1348 }
1349 orig_gen = ci->i_rdcache_gen;
1350 spin_unlock(&inode->i_lock);
1351
1352 ceph_invalidate_nondirty_pages(inode->i_mapping);
1353
1354 spin_lock(&inode->i_lock);
1355 if (orig_gen == ci->i_rdcache_gen) {
1356 dout("invalidate_pages %p gen %d successful\n", inode,
1357 ci->i_rdcache_gen);
1358 ci->i_rdcache_gen = 0;
1359 ci->i_rdcache_revoking = 0;
1360 check = 1;
1361 } else {
1362 dout("invalidate_pages %p gen %d raced, gen now %d\n",
1363 inode, orig_gen, ci->i_rdcache_gen);
1364 }
1365 spin_unlock(&inode->i_lock);
1366
1367 if (check)
1368 ceph_check_caps(ci, 0, NULL);
1369 out:
1370 iput(inode);
1371 }
1372
1373
1374 /*
1375 * called by trunc_wq; take i_mutex ourselves
1376 *
1377 * We also truncate in a separate thread as well.
1378 */
1379 static void ceph_vmtruncate_work(struct work_struct *work)
1380 {
1381 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1382 i_vmtruncate_work);
1383 struct inode *inode = &ci->vfs_inode;
1384
1385 dout("vmtruncate_work %p\n", inode);
1386 mutex_lock(&inode->i_mutex);
1387 __ceph_do_pending_vmtruncate(inode);
1388 mutex_unlock(&inode->i_mutex);
1389 iput(inode);
1390 }
1391
1392 /*
1393 * Queue an async vmtruncate. If we fail to queue work, we will handle
1394 * the truncation the next time we call __ceph_do_pending_vmtruncate.
1395 */
1396 void ceph_queue_vmtruncate(struct inode *inode)
1397 {
1398 struct ceph_inode_info *ci = ceph_inode(inode);
1399
1400 if (queue_work(ceph_client(inode->i_sb)->trunc_wq,
1401 &ci->i_vmtruncate_work)) {
1402 dout("ceph_queue_vmtruncate %p\n", inode);
1403 igrab(inode);
1404 } else {
1405 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1406 inode, ci->i_truncate_pending);
1407 }
1408 }
1409
1410 /*
1411 * called with i_mutex held.
1412 *
1413 * Make sure any pending truncation is applied before doing anything
1414 * that may depend on it.
1415 */
1416 void __ceph_do_pending_vmtruncate(struct inode *inode)
1417 {
1418 struct ceph_inode_info *ci = ceph_inode(inode);
1419 u64 to;
1420 int wrbuffer_refs, wake = 0;
1421
1422 retry:
1423 spin_lock(&inode->i_lock);
1424 if (ci->i_truncate_pending == 0) {
1425 dout("__do_pending_vmtruncate %p none pending\n", inode);
1426 spin_unlock(&inode->i_lock);
1427 return;
1428 }
1429
1430 /*
1431 * make sure any dirty snapped pages are flushed before we
1432 * possibly truncate them.. so write AND block!
1433 */
1434 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1435 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1436 inode);
1437 spin_unlock(&inode->i_lock);
1438 filemap_write_and_wait_range(&inode->i_data, 0,
1439 inode->i_sb->s_maxbytes);
1440 goto retry;
1441 }
1442
1443 to = ci->i_truncate_size;
1444 wrbuffer_refs = ci->i_wrbuffer_ref;
1445 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1446 ci->i_truncate_pending, to);
1447 spin_unlock(&inode->i_lock);
1448
1449 truncate_inode_pages(inode->i_mapping, to);
1450
1451 spin_lock(&inode->i_lock);
1452 ci->i_truncate_pending--;
1453 if (ci->i_truncate_pending == 0)
1454 wake = 1;
1455 spin_unlock(&inode->i_lock);
1456
1457 if (wrbuffer_refs == 0)
1458 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1459 if (wake)
1460 wake_up(&ci->i_cap_wq);
1461 }
1462
1463
1464 /*
1465 * symlinks
1466 */
1467 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1468 {
1469 struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1470 nd_set_link(nd, ci->i_symlink);
1471 return NULL;
1472 }
1473
1474 static const struct inode_operations ceph_symlink_iops = {
1475 .readlink = generic_readlink,
1476 .follow_link = ceph_sym_follow_link,
1477 };
1478
1479 /*
1480 * setattr
1481 */
1482 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1483 {
1484 struct inode *inode = dentry->d_inode;
1485 struct ceph_inode_info *ci = ceph_inode(inode);
1486 struct inode *parent_inode = dentry->d_parent->d_inode;
1487 const unsigned int ia_valid = attr->ia_valid;
1488 struct ceph_mds_request *req;
1489 struct ceph_mds_client *mdsc = &ceph_client(dentry->d_sb)->mdsc;
1490 int issued;
1491 int release = 0, dirtied = 0;
1492 int mask = 0;
1493 int err = 0;
1494
1495 if (ceph_snap(inode) != CEPH_NOSNAP)
1496 return -EROFS;
1497
1498 __ceph_do_pending_vmtruncate(inode);
1499
1500 err = inode_change_ok(inode, attr);
1501 if (err != 0)
1502 return err;
1503
1504 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1505 USE_AUTH_MDS);
1506 if (IS_ERR(req))
1507 return PTR_ERR(req);
1508
1509 spin_lock(&inode->i_lock);
1510 issued = __ceph_caps_issued(ci, NULL);
1511 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1512
1513 if (ia_valid & ATTR_UID) {
1514 dout("setattr %p uid %d -> %d\n", inode,
1515 inode->i_uid, attr->ia_uid);
1516 if (issued & CEPH_CAP_AUTH_EXCL) {
1517 inode->i_uid = attr->ia_uid;
1518 dirtied |= CEPH_CAP_AUTH_EXCL;
1519 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1520 attr->ia_uid != inode->i_uid) {
1521 req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid);
1522 mask |= CEPH_SETATTR_UID;
1523 release |= CEPH_CAP_AUTH_SHARED;
1524 }
1525 }
1526 if (ia_valid & ATTR_GID) {
1527 dout("setattr %p gid %d -> %d\n", inode,
1528 inode->i_gid, attr->ia_gid);
1529 if (issued & CEPH_CAP_AUTH_EXCL) {
1530 inode->i_gid = attr->ia_gid;
1531 dirtied |= CEPH_CAP_AUTH_EXCL;
1532 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1533 attr->ia_gid != inode->i_gid) {
1534 req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid);
1535 mask |= CEPH_SETATTR_GID;
1536 release |= CEPH_CAP_AUTH_SHARED;
1537 }
1538 }
1539 if (ia_valid & ATTR_MODE) {
1540 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1541 attr->ia_mode);
1542 if (issued & CEPH_CAP_AUTH_EXCL) {
1543 inode->i_mode = attr->ia_mode;
1544 dirtied |= CEPH_CAP_AUTH_EXCL;
1545 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1546 attr->ia_mode != inode->i_mode) {
1547 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1548 mask |= CEPH_SETATTR_MODE;
1549 release |= CEPH_CAP_AUTH_SHARED;
1550 }
1551 }
1552
1553 if (ia_valid & ATTR_ATIME) {
1554 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1555 inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1556 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1557 if (issued & CEPH_CAP_FILE_EXCL) {
1558 ci->i_time_warp_seq++;
1559 inode->i_atime = attr->ia_atime;
1560 dirtied |= CEPH_CAP_FILE_EXCL;
1561 } else if ((issued & CEPH_CAP_FILE_WR) &&
1562 timespec_compare(&inode->i_atime,
1563 &attr->ia_atime) < 0) {
1564 inode->i_atime = attr->ia_atime;
1565 dirtied |= CEPH_CAP_FILE_WR;
1566 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1567 !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1568 ceph_encode_timespec(&req->r_args.setattr.atime,
1569 &attr->ia_atime);
1570 mask |= CEPH_SETATTR_ATIME;
1571 release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1572 CEPH_CAP_FILE_WR;
1573 }
1574 }
1575 if (ia_valid & ATTR_MTIME) {
1576 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1577 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1578 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1579 if (issued & CEPH_CAP_FILE_EXCL) {
1580 ci->i_time_warp_seq++;
1581 inode->i_mtime = attr->ia_mtime;
1582 dirtied |= CEPH_CAP_FILE_EXCL;
1583 } else if ((issued & CEPH_CAP_FILE_WR) &&
1584 timespec_compare(&inode->i_mtime,
1585 &attr->ia_mtime) < 0) {
1586 inode->i_mtime = attr->ia_mtime;
1587 dirtied |= CEPH_CAP_FILE_WR;
1588 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1589 !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1590 ceph_encode_timespec(&req->r_args.setattr.mtime,
1591 &attr->ia_mtime);
1592 mask |= CEPH_SETATTR_MTIME;
1593 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1594 CEPH_CAP_FILE_WR;
1595 }
1596 }
1597 if (ia_valid & ATTR_SIZE) {
1598 dout("setattr %p size %lld -> %lld\n", inode,
1599 inode->i_size, attr->ia_size);
1600 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1601 err = -EINVAL;
1602 goto out;
1603 }
1604 if ((issued & CEPH_CAP_FILE_EXCL) &&
1605 attr->ia_size > inode->i_size) {
1606 inode->i_size = attr->ia_size;
1607 inode->i_blocks =
1608 (attr->ia_size + (1 << 9) - 1) >> 9;
1609 inode->i_ctime = attr->ia_ctime;
1610 ci->i_reported_size = attr->ia_size;
1611 dirtied |= CEPH_CAP_FILE_EXCL;
1612 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1613 attr->ia_size != inode->i_size) {
1614 req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1615 req->r_args.setattr.old_size =
1616 cpu_to_le64(inode->i_size);
1617 mask |= CEPH_SETATTR_SIZE;
1618 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1619 CEPH_CAP_FILE_WR;
1620 }
1621 }
1622
1623 /* these do nothing */
1624 if (ia_valid & ATTR_CTIME) {
1625 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1626 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1627 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1628 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1629 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1630 only ? "ctime only" : "ignored");
1631 inode->i_ctime = attr->ia_ctime;
1632 if (only) {
1633 /*
1634 * if kernel wants to dirty ctime but nothing else,
1635 * we need to choose a cap to dirty under, or do
1636 * a almost-no-op setattr
1637 */
1638 if (issued & CEPH_CAP_AUTH_EXCL)
1639 dirtied |= CEPH_CAP_AUTH_EXCL;
1640 else if (issued & CEPH_CAP_FILE_EXCL)
1641 dirtied |= CEPH_CAP_FILE_EXCL;
1642 else if (issued & CEPH_CAP_XATTR_EXCL)
1643 dirtied |= CEPH_CAP_XATTR_EXCL;
1644 else
1645 mask |= CEPH_SETATTR_CTIME;
1646 }
1647 }
1648 if (ia_valid & ATTR_FILE)
1649 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1650
1651 if (dirtied) {
1652 __ceph_mark_dirty_caps(ci, dirtied);
1653 inode->i_ctime = CURRENT_TIME;
1654 }
1655
1656 release &= issued;
1657 spin_unlock(&inode->i_lock);
1658
1659 if (mask) {
1660 req->r_inode = igrab(inode);
1661 req->r_inode_drop = release;
1662 req->r_args.setattr.mask = cpu_to_le32(mask);
1663 req->r_num_caps = 1;
1664 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1665 }
1666 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1667 ceph_cap_string(dirtied), mask);
1668
1669 ceph_mdsc_put_request(req);
1670 __ceph_do_pending_vmtruncate(inode);
1671 return err;
1672 out:
1673 spin_unlock(&inode->i_lock);
1674 ceph_mdsc_put_request(req);
1675 return err;
1676 }
1677
1678 /*
1679 * Verify that we have a lease on the given mask. If not,
1680 * do a getattr against an mds.
1681 */
1682 int ceph_do_getattr(struct inode *inode, int mask)
1683 {
1684 struct ceph_client *client = ceph_sb_to_client(inode->i_sb);
1685 struct ceph_mds_client *mdsc = &client->mdsc;
1686 struct ceph_mds_request *req;
1687 int err;
1688
1689 if (ceph_snap(inode) == CEPH_SNAPDIR) {
1690 dout("do_getattr inode %p SNAPDIR\n", inode);
1691 return 0;
1692 }
1693
1694 dout("do_getattr inode %p mask %s\n", inode, ceph_cap_string(mask));
1695 if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1696 return 0;
1697
1698 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1699 if (IS_ERR(req))
1700 return PTR_ERR(req);
1701 req->r_inode = igrab(inode);
1702 req->r_num_caps = 1;
1703 req->r_args.getattr.mask = cpu_to_le32(mask);
1704 err = ceph_mdsc_do_request(mdsc, NULL, req);
1705 ceph_mdsc_put_request(req);
1706 dout("do_getattr result=%d\n", err);
1707 return err;
1708 }
1709
1710
1711 /*
1712 * Check inode permissions. We verify we have a valid value for
1713 * the AUTH cap, then call the generic handler.
1714 */
1715 int ceph_permission(struct inode *inode, int mask)
1716 {
1717 int err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1718
1719 if (!err)
1720 err = generic_permission(inode, mask, NULL);
1721 return err;
1722 }
1723
1724 /*
1725 * Get all attributes. Hopefully somedata we'll have a statlite()
1726 * and can limit the fields we require to be accurate.
1727 */
1728 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1729 struct kstat *stat)
1730 {
1731 struct inode *inode = dentry->d_inode;
1732 struct ceph_inode_info *ci = ceph_inode(inode);
1733 int err;
1734
1735 err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1736 if (!err) {
1737 generic_fillattr(inode, stat);
1738 stat->ino = inode->i_ino;
1739 if (ceph_snap(inode) != CEPH_NOSNAP)
1740 stat->dev = ceph_snap(inode);
1741 else
1742 stat->dev = 0;
1743 if (S_ISDIR(inode->i_mode)) {
1744 stat->size = ci->i_rbytes;
1745 stat->blocks = 0;
1746 stat->blksize = 65536;
1747 }
1748 }
1749 return err;
1750 }
Linux kernel - Deliverables
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