?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
MIPS: SB1250: Include correct header and fix a warning
[linux-2.6/linux-mips.git] / fs / ceph / inode.c
blob26f883c275e85e6746f23884015d08777cbff95d
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 /*
382 * we may still have a snap_realm reference if there are stray
383 * caps in i_cap_exporting_issued or i_snap_caps.
384 */
385 if (ci->i_snap_realm) {
386 struct ceph_mds_client *mdsc =
387 &ceph_client(ci->vfs_inode.i_sb)->mdsc;
388 struct ceph_snap_realm *realm = ci->i_snap_realm;
389
390 dout(" dropping residual ref to snap realm %p\n", realm);
391 spin_lock(&realm->inodes_with_caps_lock);
392 list_del_init(&ci->i_snap_realm_item);
393 spin_unlock(&realm->inodes_with_caps_lock);
394 ceph_put_snap_realm(mdsc, realm);
395 }
396
397 kfree(ci->i_symlink);
398 while ((n = rb_first(&ci->i_fragtree)) != NULL) {
399 frag = rb_entry(n, struct ceph_inode_frag, node);
400 rb_erase(n, &ci->i_fragtree);
401 kfree(frag);
402 }
403
404 __ceph_destroy_xattrs(ci);
405 if (ci->i_xattrs.blob)
406 ceph_buffer_put(ci->i_xattrs.blob);
407 if (ci->i_xattrs.prealloc_blob)
408 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
409
410 kmem_cache_free(ceph_inode_cachep, ci);
411 }
412
413
414 /*
415 * Helpers to fill in size, ctime, mtime, and atime. We have to be
416 * careful because either the client or MDS may have more up to date
417 * info, depending on which capabilities are held, and whether
418 * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime
419 * and size are monotonically increasing, except when utimes() or
420 * truncate() increments the corresponding _seq values.)
421 */
422 int ceph_fill_file_size(struct inode *inode, int issued,
423 u32 truncate_seq, u64 truncate_size, u64 size)
424 {
425 struct ceph_inode_info *ci = ceph_inode(inode);
426 int queue_trunc = 0;
427
428 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
429 (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
430 dout("size %lld -> %llu\n", inode->i_size, size);
431 inode->i_size = size;
432 inode->i_blocks = (size + (1<<9) - 1) >> 9;
433 ci->i_reported_size = size;
434 if (truncate_seq != ci->i_truncate_seq) {
435 dout("truncate_seq %u -> %u\n",
436 ci->i_truncate_seq, truncate_seq);
437 ci->i_truncate_seq = truncate_seq;
438 /*
439 * If we hold relevant caps, or in the case where we're
440 * not the only client referencing this file and we
441 * don't hold those caps, then we need to check whether
442 * the file is either opened or mmaped
443 */
444 if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_RD|
445 CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER|
446 CEPH_CAP_FILE_EXCL)) ||
447 mapping_mapped(inode->i_mapping) ||
448 __ceph_caps_file_wanted(ci)) {
449 ci->i_truncate_pending++;
450 queue_trunc = 1;
451 }
452 }
453 }
454 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
455 ci->i_truncate_size != truncate_size) {
456 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
457 truncate_size);
458 ci->i_truncate_size = truncate_size;
459 }
460 return queue_trunc;
461 }
462
463 void ceph_fill_file_time(struct inode *inode, int issued,
464 u64 time_warp_seq, struct timespec *ctime,
465 struct timespec *mtime, struct timespec *atime)
466 {
467 struct ceph_inode_info *ci = ceph_inode(inode);
468 int warn = 0;
469
470 if (issued & (CEPH_CAP_FILE_EXCL|
471 CEPH_CAP_FILE_WR|
472 CEPH_CAP_FILE_BUFFER)) {
473 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
474 dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
475 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
476 ctime->tv_sec, ctime->tv_nsec);
477 inode->i_ctime = *ctime;
478 }
479 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
480 /* the MDS did a utimes() */
481 dout("mtime %ld.%09ld -> %ld.%09ld "
482 "tw %d -> %d\n",
483 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
484 mtime->tv_sec, mtime->tv_nsec,
485 ci->i_time_warp_seq, (int)time_warp_seq);
486
487 inode->i_mtime = *mtime;
488 inode->i_atime = *atime;
489 ci->i_time_warp_seq = time_warp_seq;
490 } else if (time_warp_seq == ci->i_time_warp_seq) {
491 /* nobody did utimes(); take the max */
492 if (timespec_compare(mtime, &inode->i_mtime) > 0) {
493 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
494 inode->i_mtime.tv_sec,
495 inode->i_mtime.tv_nsec,
496 mtime->tv_sec, mtime->tv_nsec);
497 inode->i_mtime = *mtime;
498 }
499 if (timespec_compare(atime, &inode->i_atime) > 0) {
500 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
501 inode->i_atime.tv_sec,
502 inode->i_atime.tv_nsec,
503 atime->tv_sec, atime->tv_nsec);
504 inode->i_atime = *atime;
505 }
506 } else if (issued & CEPH_CAP_FILE_EXCL) {
507 /* we did a utimes(); ignore mds values */
508 } else {
509 warn = 1;
510 }
511 } else {
512 /* we have no write caps; whatever the MDS says is true */
513 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
514 inode->i_ctime = *ctime;
515 inode->i_mtime = *mtime;
516 inode->i_atime = *atime;
517 ci->i_time_warp_seq = time_warp_seq;
518 } else {
519 warn = 1;
520 }
521 }
522 if (warn) /* time_warp_seq shouldn't go backwards */
523 dout("%p mds time_warp_seq %llu < %u\n",
524 inode, time_warp_seq, ci->i_time_warp_seq);
525 }
526
527 /*
528 * Populate an inode based on info from mds. May be called on new or
529 * existing inodes.
530 */
531 static int fill_inode(struct inode *inode,
532 struct ceph_mds_reply_info_in *iinfo,
533 struct ceph_mds_reply_dirfrag *dirinfo,
534 struct ceph_mds_session *session,
535 unsigned long ttl_from, int cap_fmode,
536 struct ceph_cap_reservation *caps_reservation)
537 {
538 struct ceph_mds_reply_inode *info = iinfo->in;
539 struct ceph_inode_info *ci = ceph_inode(inode);
540 int i;
541 int issued, implemented;
542 struct timespec mtime, atime, ctime;
543 u32 nsplits;
544 struct ceph_buffer *xattr_blob = NULL;
545 int err = 0;
546 int queue_trunc = 0;
547
548 dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
549 inode, ceph_vinop(inode), le64_to_cpu(info->version),
550 ci->i_version);
551
552 /*
553 * prealloc xattr data, if it looks like we'll need it. only
554 * if len > 4 (meaning there are actually xattrs; the first 4
555 * bytes are the xattr count).
556 */
557 if (iinfo->xattr_len > 4) {
558 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
559 if (!xattr_blob)
560 pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
561 iinfo->xattr_len);
562 }
563
564 spin_lock(&inode->i_lock);
565
566 /*
567 * provided version will be odd if inode value is projected,
568 * even if stable. skip the update if we have a newer info
569 * (e.g., due to inode info racing form multiple MDSs), or if
570 * we are getting projected (unstable) inode info.
571 */
572 if (le64_to_cpu(info->version) > 0 &&
573 (ci->i_version & ~1) > le64_to_cpu(info->version))
574 goto no_change;
575
576 issued = __ceph_caps_issued(ci, &implemented);
577 issued |= implemented | __ceph_caps_dirty(ci);
578
579 /* update inode */
580 ci->i_version = le64_to_cpu(info->version);
581 inode->i_version++;
582 inode->i_rdev = le32_to_cpu(info->rdev);
583
584 if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
585 inode->i_mode = le32_to_cpu(info->mode);
586 inode->i_uid = le32_to_cpu(info->uid);
587 inode->i_gid = le32_to_cpu(info->gid);
588 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
589 inode->i_uid, inode->i_gid);
590 }
591
592 if ((issued & CEPH_CAP_LINK_EXCL) == 0)
593 inode->i_nlink = le32_to_cpu(info->nlink);
594
595 /* be careful with mtime, atime, size */
596 ceph_decode_timespec(&atime, &info->atime);
597 ceph_decode_timespec(&mtime, &info->mtime);
598 ceph_decode_timespec(&ctime, &info->ctime);
599 queue_trunc = ceph_fill_file_size(inode, issued,
600 le32_to_cpu(info->truncate_seq),
601 le64_to_cpu(info->truncate_size),
602 le64_to_cpu(info->size));
603 ceph_fill_file_time(inode, issued,
604 le32_to_cpu(info->time_warp_seq),
605 &ctime, &mtime, &atime);
606
607 ci->i_max_size = le64_to_cpu(info->max_size);
608 ci->i_layout = info->layout;
609 inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
610
611 /* xattrs */
612 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
613 if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
614 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
615 if (ci->i_xattrs.blob)
616 ceph_buffer_put(ci->i_xattrs.blob);
617 ci->i_xattrs.blob = xattr_blob;
618 if (xattr_blob)
619 memcpy(ci->i_xattrs.blob->vec.iov_base,
620 iinfo->xattr_data, iinfo->xattr_len);
621 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
622 }
623
624 inode->i_mapping->a_ops = &ceph_aops;
625 inode->i_mapping->backing_dev_info =
626 &ceph_client(inode->i_sb)->backing_dev_info;
627
628 switch (inode->i_mode & S_IFMT) {
629 case S_IFIFO:
630 case S_IFBLK:
631 case S_IFCHR:
632 case S_IFSOCK:
633 init_special_inode(inode, inode->i_mode, inode->i_rdev);
634 inode->i_op = &ceph_file_iops;
635 break;
636 case S_IFREG:
637 inode->i_op = &ceph_file_iops;
638 inode->i_fop = &ceph_file_fops;
639 break;
640 case S_IFLNK:
641 inode->i_op = &ceph_symlink_iops;
642 if (!ci->i_symlink) {
643 int symlen = iinfo->symlink_len;
644 char *sym;
645
646 BUG_ON(symlen != inode->i_size);
647 spin_unlock(&inode->i_lock);
648
649 err = -ENOMEM;
650 sym = kmalloc(symlen+1, GFP_NOFS);
651 if (!sym)
652 goto out;
653 memcpy(sym, iinfo->symlink, symlen);
654 sym[symlen] = 0;
655
656 spin_lock(&inode->i_lock);
657 if (!ci->i_symlink)
658 ci->i_symlink = sym;
659 else
660 kfree(sym); /* lost a race */
661 }
662 break;
663 case S_IFDIR:
664 inode->i_op = &ceph_dir_iops;
665 inode->i_fop = &ceph_dir_fops;
666
667 ci->i_files = le64_to_cpu(info->files);
668 ci->i_subdirs = le64_to_cpu(info->subdirs);
669 ci->i_rbytes = le64_to_cpu(info->rbytes);
670 ci->i_rfiles = le64_to_cpu(info->rfiles);
671 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
672 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
673
674 /* set dir completion flag? */
675 if (ci->i_files == 0 && ci->i_subdirs == 0 &&
676 ceph_snap(inode) == CEPH_NOSNAP &&
677 (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED)) {
678 dout(" marking %p complete (empty)\n", inode);
679 ci->i_ceph_flags |= CEPH_I_COMPLETE;
680 ci->i_max_offset = 2;
681 }
682
683 /* it may be better to set st_size in getattr instead? */
684 if (ceph_test_opt(ceph_client(inode->i_sb), RBYTES))
685 inode->i_size = ci->i_rbytes;
686 break;
687 default:
688 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
689 ceph_vinop(inode), inode->i_mode);
690 }
691
692 no_change:
693 spin_unlock(&inode->i_lock);
694
695 /* queue truncate if we saw i_size decrease */
696 if (queue_trunc)
697 ceph_queue_vmtruncate(inode);
698
699 /* populate frag tree */
700 /* FIXME: move me up, if/when version reflects fragtree changes */
701 nsplits = le32_to_cpu(info->fragtree.nsplits);
702 mutex_lock(&ci->i_fragtree_mutex);
703 for (i = 0; i < nsplits; i++) {
704 u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
705 struct ceph_inode_frag *frag = __get_or_create_frag(ci, id);
706
707 if (IS_ERR(frag))
708 continue;
709 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
710 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
711 }
712 mutex_unlock(&ci->i_fragtree_mutex);
713
714 /* were we issued a capability? */
715 if (info->cap.caps) {
716 if (ceph_snap(inode) == CEPH_NOSNAP) {
717 ceph_add_cap(inode, session,
718 le64_to_cpu(info->cap.cap_id),
719 cap_fmode,
720 le32_to_cpu(info->cap.caps),
721 le32_to_cpu(info->cap.wanted),
722 le32_to_cpu(info->cap.seq),
723 le32_to_cpu(info->cap.mseq),
724 le64_to_cpu(info->cap.realm),
725 info->cap.flags,
726 caps_reservation);
727 } else {
728 spin_lock(&inode->i_lock);
729 dout(" %p got snap_caps %s\n", inode,
730 ceph_cap_string(le32_to_cpu(info->cap.caps)));
731 ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
732 if (cap_fmode >= 0)
733 __ceph_get_fmode(ci, cap_fmode);
734 spin_unlock(&inode->i_lock);
735 }
736 }
737
738 /* update delegation info? */
739 if (dirinfo)
740 ceph_fill_dirfrag(inode, dirinfo);
741
742 err = 0;
743
744 out:
745 if (xattr_blob)
746 ceph_buffer_put(xattr_blob);
747 return err;
748 }
749
750 /*
751 * caller should hold session s_mutex.
752 */
753 static void update_dentry_lease(struct dentry *dentry,
754 struct ceph_mds_reply_lease *lease,
755 struct ceph_mds_session *session,
756 unsigned long from_time)
757 {
758 struct ceph_dentry_info *di = ceph_dentry(dentry);
759 long unsigned duration = le32_to_cpu(lease->duration_ms);
760 long unsigned ttl = from_time + (duration * HZ) / 1000;
761 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
762 struct inode *dir;
763
764 /* only track leases on regular dentries */
765 if (dentry->d_op != &ceph_dentry_ops)
766 return;
767
768 spin_lock(&dentry->d_lock);
769 dout("update_dentry_lease %p mask %d duration %lu ms ttl %lu\n",
770 dentry, le16_to_cpu(lease->mask), duration, ttl);
771
772 /* make lease_rdcache_gen match directory */
773 dir = dentry->d_parent->d_inode;
774 di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
775
776 if (lease->mask == 0)
777 goto out_unlock;
778
779 if (di->lease_gen == session->s_cap_gen &&
780 time_before(ttl, dentry->d_time))
781 goto out_unlock; /* we already have a newer lease. */
782
783 if (di->lease_session && di->lease_session != session)
784 goto out_unlock;
785
786 ceph_dentry_lru_touch(dentry);
787
788 if (!di->lease_session)
789 di->lease_session = ceph_get_mds_session(session);
790 di->lease_gen = session->s_cap_gen;
791 di->lease_seq = le32_to_cpu(lease->seq);
792 di->lease_renew_after = half_ttl;
793 di->lease_renew_from = 0;
794 dentry->d_time = ttl;
795 out_unlock:
796 spin_unlock(&dentry->d_lock);
797 return;
798 }
799
800 /*
801 * splice a dentry to an inode.
802 * caller must hold directory i_mutex for this to be safe.
803 *
804 * we will only rehash the resulting dentry if @prehash is
805 * true; @prehash will be set to false (for the benefit of
806 * the caller) if we fail.
807 */
808 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
809 bool *prehash)
810 {
811 struct dentry *realdn;
812
813 /* dn must be unhashed */
814 if (!d_unhashed(dn))
815 d_drop(dn);
816 realdn = d_materialise_unique(dn, in);
817 if (IS_ERR(realdn)) {
818 pr_err("splice_dentry error %p inode %p ino %llx.%llx\n",
819 dn, in, ceph_vinop(in));
820 if (prehash)
821 *prehash = false; /* don't rehash on error */
822 dn = realdn; /* note realdn contains the error */
823 goto out;
824 } else if (realdn) {
825 dout("dn %p (%d) spliced with %p (%d) "
826 "inode %p ino %llx.%llx\n",
827 dn, atomic_read(&dn->d_count),
828 realdn, atomic_read(&realdn->d_count),
829 realdn->d_inode, ceph_vinop(realdn->d_inode));
830 dput(dn);
831 dn = realdn;
832 } else {
833 BUG_ON(!ceph_dentry(dn));
834
835 dout("dn %p attached to %p ino %llx.%llx\n",
836 dn, dn->d_inode, ceph_vinop(dn->d_inode));
837 }
838 if ((!prehash || *prehash) && d_unhashed(dn))
839 d_rehash(dn);
840 out:
841 return dn;
842 }
843
844 /*
845 * Set dentry's directory position based on the current dir's max, and
846 * order it in d_subdirs, so that dcache_readdir behaves.
847 */
848 static void ceph_set_dentry_offset(struct dentry *dn)
849 {
850 struct dentry *dir = dn->d_parent;
851 struct inode *inode = dn->d_parent->d_inode;
852 struct ceph_dentry_info *di;
853
854 BUG_ON(!inode);
855
856 di = ceph_dentry(dn);
857
858 spin_lock(&inode->i_lock);
859 di->offset = ceph_inode(inode)->i_max_offset++;
860 spin_unlock(&inode->i_lock);
861
862 spin_lock(&dcache_lock);
863 spin_lock(&dn->d_lock);
864 list_move_tail(&dir->d_subdirs, &dn->d_u.d_child);
865 dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
866 dn->d_u.d_child.prev, dn->d_u.d_child.next);
867 spin_unlock(&dn->d_lock);
868 spin_unlock(&dcache_lock);
869 }
870
871 /*
872 * Incorporate results into the local cache. This is either just
873 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
874 * after a lookup).
875 *
876 * A reply may contain
877 * a directory inode along with a dentry.
878 * and/or a target inode
879 *
880 * Called with snap_rwsem (read).
881 */
882 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
883 struct ceph_mds_session *session)
884 {
885 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
886 struct inode *in = NULL;
887 struct ceph_mds_reply_inode *ininfo;
888 struct ceph_vino vino;
889 struct ceph_client *client = ceph_sb_to_client(sb);
890 int i = 0;
891 int err = 0;
892
893 dout("fill_trace %p is_dentry %d is_target %d\n", req,
894 rinfo->head->is_dentry, rinfo->head->is_target);
895
896 #if 0
897 /*
898 * Debugging hook:
899 *
900 * If we resend completed ops to a recovering mds, we get no
901 * trace. Since that is very rare, pretend this is the case
902 * to ensure the 'no trace' handlers in the callers behave.
903 *
904 * Fill in inodes unconditionally to avoid breaking cap
905 * invariants.
906 */
907 if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
908 pr_info("fill_trace faking empty trace on %lld %s\n",
909 req->r_tid, ceph_mds_op_name(rinfo->head->op));
910 if (rinfo->head->is_dentry) {
911 rinfo->head->is_dentry = 0;
912 err = fill_inode(req->r_locked_dir,
913 &rinfo->diri, rinfo->dirfrag,
914 session, req->r_request_started, -1);
915 }
916 if (rinfo->head->is_target) {
917 rinfo->head->is_target = 0;
918 ininfo = rinfo->targeti.in;
919 vino.ino = le64_to_cpu(ininfo->ino);
920 vino.snap = le64_to_cpu(ininfo->snapid);
921 in = ceph_get_inode(sb, vino);
922 err = fill_inode(in, &rinfo->targeti, NULL,
923 session, req->r_request_started,
924 req->r_fmode);
925 iput(in);
926 }
927 }
928 #endif
929
930 if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
931 dout("fill_trace reply is empty!\n");
932 if (rinfo->head->result == 0 && req->r_locked_dir) {
933 struct ceph_inode_info *ci =
934 ceph_inode(req->r_locked_dir);
935 dout(" clearing %p complete (empty trace)\n",
936 req->r_locked_dir);
937 ci->i_ceph_flags &= ~CEPH_I_COMPLETE;
938 ci->i_release_count++;
939 }
940 return 0;
941 }
942
943 if (rinfo->head->is_dentry) {
944 struct inode *dir = req->r_locked_dir;
945
946 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
947 session, req->r_request_started, -1,
948 &req->r_caps_reservation);
949 if (err < 0)
950 return err;
951 }
952
953 /*
954 * ignore null lease/binding on snapdir ENOENT, or else we
955 * will have trouble splicing in the virtual snapdir later
956 */
957 if (rinfo->head->is_dentry && !req->r_aborted &&
958 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
959 client->mount_args->snapdir_name,
960 req->r_dentry->d_name.len))) {
961 /*
962 * lookup link rename : null -> possibly existing inode
963 * mknod symlink mkdir : null -> new inode
964 * unlink : linked -> null
965 */
966 struct inode *dir = req->r_locked_dir;
967 struct dentry *dn = req->r_dentry;
968 bool have_dir_cap, have_lease;
969
970 BUG_ON(!dn);
971 BUG_ON(!dir);
972 BUG_ON(dn->d_parent->d_inode != dir);
973 BUG_ON(ceph_ino(dir) !=
974 le64_to_cpu(rinfo->diri.in->ino));
975 BUG_ON(ceph_snap(dir) !=
976 le64_to_cpu(rinfo->diri.in->snapid));
977
978 /* do we have a lease on the whole dir? */
979 have_dir_cap =
980 (le32_to_cpu(rinfo->diri.in->cap.caps) &
981 CEPH_CAP_FILE_SHARED);
982
983 /* do we have a dn lease? */
984 have_lease = have_dir_cap ||
985 (le16_to_cpu(rinfo->dlease->mask) &
986 CEPH_LOCK_DN);
987
988 if (!have_lease)
989 dout("fill_trace no dentry lease or dir cap\n");
990
991 /* rename? */
992 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
993 dout(" src %p '%.*s' dst %p '%.*s'\n",
994 req->r_old_dentry,
995 req->r_old_dentry->d_name.len,
996 req->r_old_dentry->d_name.name,
997 dn, dn->d_name.len, dn->d_name.name);
998 dout("fill_trace doing d_move %p -> %p\n",
999 req->r_old_dentry, dn);
1000 d_move(req->r_old_dentry, dn);
1001 dout(" src %p '%.*s' dst %p '%.*s'\n",
1002 req->r_old_dentry,
1003 req->r_old_dentry->d_name.len,
1004 req->r_old_dentry->d_name.name,
1005 dn, dn->d_name.len, dn->d_name.name);
1006 /* ensure target dentry is invalidated, despite
1007 rehashing bug in vfs_rename_dir */
1008 dn->d_time = jiffies;
1009 ceph_dentry(dn)->lease_shared_gen = 0;
1010 /* take overwritten dentry's readdir offset */
1011 ceph_dentry(req->r_old_dentry)->offset =
1012 ceph_dentry(dn)->offset;
1013 dn = req->r_old_dentry; /* use old_dentry */
1014 in = dn->d_inode;
1015 }
1016
1017 /* null dentry? */
1018 if (!rinfo->head->is_target) {
1019 dout("fill_trace null dentry\n");
1020 if (dn->d_inode) {
1021 dout("d_delete %p\n", dn);
1022 d_delete(dn);
1023 } else {
1024 dout("d_instantiate %p NULL\n", dn);
1025 d_instantiate(dn, NULL);
1026 if (have_lease && d_unhashed(dn))
1027 d_rehash(dn);
1028 update_dentry_lease(dn, rinfo->dlease,
1029 session,
1030 req->r_request_started);
1031 }
1032 goto done;
1033 }
1034
1035 /* attach proper inode */
1036 ininfo = rinfo->targeti.in;
1037 vino.ino = le64_to_cpu(ininfo->ino);
1038 vino.snap = le64_to_cpu(ininfo->snapid);
1039 if (!dn->d_inode) {
1040 in = ceph_get_inode(sb, vino);
1041 if (IS_ERR(in)) {
1042 pr_err("fill_trace bad get_inode "
1043 "%llx.%llx\n", vino.ino, vino.snap);
1044 err = PTR_ERR(in);
1045 d_delete(dn);
1046 goto done;
1047 }
1048 dn = splice_dentry(dn, in, &have_lease);
1049 if (IS_ERR(dn)) {
1050 err = PTR_ERR(dn);
1051 goto done;
1052 }
1053 req->r_dentry = dn; /* may have spliced */
1054 ceph_set_dentry_offset(dn);
1055 igrab(in);
1056 } else if (ceph_ino(in) == vino.ino &&
1057 ceph_snap(in) == vino.snap) {
1058 igrab(in);
1059 } else {
1060 dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1061 dn, in, ceph_ino(in), ceph_snap(in),
1062 vino.ino, vino.snap);
1063 have_lease = false;
1064 in = NULL;
1065 }
1066
1067 if (have_lease)
1068 update_dentry_lease(dn, rinfo->dlease, session,
1069 req->r_request_started);
1070 dout(" final dn %p\n", dn);
1071 i++;
1072 } else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1073 req->r_op == CEPH_MDS_OP_MKSNAP) {
1074 struct dentry *dn = req->r_dentry;
1075
1076 /* fill out a snapdir LOOKUPSNAP dentry */
1077 BUG_ON(!dn);
1078 BUG_ON(!req->r_locked_dir);
1079 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1080 ininfo = rinfo->targeti.in;
1081 vino.ino = le64_to_cpu(ininfo->ino);
1082 vino.snap = le64_to_cpu(ininfo->snapid);
1083 in = ceph_get_inode(sb, vino);
1084 if (IS_ERR(in)) {
1085 pr_err("fill_inode get_inode badness %llx.%llx\n",
1086 vino.ino, vino.snap);
1087 err = PTR_ERR(in);
1088 d_delete(dn);
1089 goto done;
1090 }
1091 dout(" linking snapped dir %p to dn %p\n", in, dn);
1092 dn = splice_dentry(dn, in, NULL);
1093 if (IS_ERR(dn)) {
1094 err = PTR_ERR(dn);
1095 goto done;
1096 }
1097 ceph_set_dentry_offset(dn);
1098 req->r_dentry = dn; /* may have spliced */
1099 igrab(in);
1100 rinfo->head->is_dentry = 1; /* fool notrace handlers */
1101 }
1102
1103 if (rinfo->head->is_target) {
1104 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1105 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1106
1107 if (in == NULL || ceph_ino(in) != vino.ino ||
1108 ceph_snap(in) != vino.snap) {
1109 in = ceph_get_inode(sb, vino);
1110 if (IS_ERR(in)) {
1111 err = PTR_ERR(in);
1112 goto done;
1113 }
1114 }
1115 req->r_target_inode = in;
1116
1117 err = fill_inode(in,
1118 &rinfo->targeti, NULL,
1119 session, req->r_request_started,
1120 (le32_to_cpu(rinfo->head->result) == 0) ?
1121 req->r_fmode : -1,
1122 &req->r_caps_reservation);
1123 if (err < 0) {
1124 pr_err("fill_inode badness %p %llx.%llx\n",
1125 in, ceph_vinop(in));
1126 goto done;
1127 }
1128 }
1129
1130 done:
1131 dout("fill_trace done err=%d\n", err);
1132 return err;
1133 }
1134
1135 /*
1136 * Prepopulate our cache with readdir results, leases, etc.
1137 */
1138 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1139 struct ceph_mds_session *session)
1140 {
1141 struct dentry *parent = req->r_dentry;
1142 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1143 struct qstr dname;
1144 struct dentry *dn;
1145 struct inode *in;
1146 int err = 0, i;
1147 struct inode *snapdir = NULL;
1148 struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1149 u64 frag = le32_to_cpu(rhead->args.readdir.frag);
1150 struct ceph_dentry_info *di;
1151
1152 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1153 snapdir = ceph_get_snapdir(parent->d_inode);
1154 parent = d_find_alias(snapdir);
1155 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1156 rinfo->dir_nr, parent);
1157 } else {
1158 dout("readdir_prepopulate %d items under dn %p\n",
1159 rinfo->dir_nr, parent);
1160 if (rinfo->dir_dir)
1161 ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1162 }
1163
1164 for (i = 0; i < rinfo->dir_nr; i++) {
1165 struct ceph_vino vino;
1166
1167 dname.name = rinfo->dir_dname[i];
1168 dname.len = rinfo->dir_dname_len[i];
1169 dname.hash = full_name_hash(dname.name, dname.len);
1170
1171 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1172 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1173
1174 retry_lookup:
1175 dn = d_lookup(parent, &dname);
1176 dout("d_lookup on parent=%p name=%.*s got %p\n",
1177 parent, dname.len, dname.name, dn);
1178
1179 if (!dn) {
1180 dn = d_alloc(parent, &dname);
1181 dout("d_alloc %p '%.*s' = %p\n", parent,
1182 dname.len, dname.name, dn);
1183 if (dn == NULL) {
1184 dout("d_alloc badness\n");
1185 err = -ENOMEM;
1186 goto out;
1187 }
1188 err = ceph_init_dentry(dn);
1189 if (err < 0)
1190 goto out;
1191 } else if (dn->d_inode &&
1192 (ceph_ino(dn->d_inode) != vino.ino ||
1193 ceph_snap(dn->d_inode) != vino.snap)) {
1194 dout(" dn %p points to wrong inode %p\n",
1195 dn, dn->d_inode);
1196 d_delete(dn);
1197 dput(dn);
1198 goto retry_lookup;
1199 } else {
1200 /* reorder parent's d_subdirs */
1201 spin_lock(&dcache_lock);
1202 spin_lock(&dn->d_lock);
1203 list_move(&dn->d_u.d_child, &parent->d_subdirs);
1204 spin_unlock(&dn->d_lock);
1205 spin_unlock(&dcache_lock);
1206 }
1207
1208 di = dn->d_fsdata;
1209 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1210
1211 /* inode */
1212 if (dn->d_inode) {
1213 in = dn->d_inode;
1214 } else {
1215 in = ceph_get_inode(parent->d_sb, vino);
1216 if (in == NULL) {
1217 dout("new_inode badness\n");
1218 d_delete(dn);
1219 dput(dn);
1220 err = -ENOMEM;
1221 goto out;
1222 }
1223 dn = splice_dentry(dn, in, NULL);
1224 }
1225
1226 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1227 req->r_request_started, -1,
1228 &req->r_caps_reservation) < 0) {
1229 pr_err("fill_inode badness on %p\n", in);
1230 dput(dn);
1231 continue;
1232 }
1233 update_dentry_lease(dn, rinfo->dir_dlease[i],
1234 req->r_session, req->r_request_started);
1235 dput(dn);
1236 }
1237 req->r_did_prepopulate = true;
1238
1239 out:
1240 if (snapdir) {
1241 iput(snapdir);
1242 dput(parent);
1243 }
1244 dout("readdir_prepopulate done\n");
1245 return err;
1246 }
1247
1248 int ceph_inode_set_size(struct inode *inode, loff_t size)
1249 {
1250 struct ceph_inode_info *ci = ceph_inode(inode);
1251 int ret = 0;
1252
1253 spin_lock(&inode->i_lock);
1254 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1255 inode->i_size = size;
1256 inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1257
1258 /* tell the MDS if we are approaching max_size */
1259 if ((size << 1) >= ci->i_max_size &&
1260 (ci->i_reported_size << 1) < ci->i_max_size)
1261 ret = 1;
1262
1263 spin_unlock(&inode->i_lock);
1264 return ret;
1265 }
1266
1267 /*
1268 * Write back inode data in a worker thread. (This can't be done
1269 * in the message handler context.)
1270 */
1271 void ceph_queue_writeback(struct inode *inode)
1272 {
1273 if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1274 &ceph_inode(inode)->i_wb_work)) {
1275 dout("ceph_queue_writeback %p\n", inode);
1276 igrab(inode);
1277 } else {
1278 dout("ceph_queue_writeback %p failed\n", inode);
1279 }
1280 }
1281
1282 static void ceph_writeback_work(struct work_struct *work)
1283 {
1284 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1285 i_wb_work);
1286 struct inode *inode = &ci->vfs_inode;
1287
1288 dout("writeback %p\n", inode);
1289 filemap_fdatawrite(&inode->i_data);
1290 iput(inode);
1291 }
1292
1293 /*
1294 * queue an async invalidation
1295 */
1296 void ceph_queue_invalidate(struct inode *inode)
1297 {
1298 if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1299 &ceph_inode(inode)->i_pg_inv_work)) {
1300 dout("ceph_queue_invalidate %p\n", inode);
1301 igrab(inode);
1302 } else {
1303 dout("ceph_queue_invalidate %p failed\n", inode);
1304 }
1305 }
1306
1307 /*
1308 * invalidate any pages that are not dirty or under writeback. this
1309 * includes pages that are clean and mapped.
1310 */
1311 static void ceph_invalidate_nondirty_pages(struct address_space *mapping)
1312 {
1313 struct pagevec pvec;
1314 pgoff_t next = 0;
1315 int i;
1316
1317 pagevec_init(&pvec, 0);
1318 while (pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
1319 for (i = 0; i < pagevec_count(&pvec); i++) {
1320 struct page *page = pvec.pages[i];
1321 pgoff_t index;
1322 int skip_page =
1323 (PageDirty(page) || PageWriteback(page));
1324
1325 if (!skip_page)
1326 skip_page = !trylock_page(page);
1327
1328 /*
1329 * We really shouldn't be looking at the ->index of an
1330 * unlocked page. But we're not allowed to lock these
1331 * pages. So we rely upon nobody altering the ->index
1332 * of this (pinned-by-us) page.
1333 */
1334 index = page->index;
1335 if (index > next)
1336 next = index;
1337 next++;
1338
1339 if (skip_page)
1340 continue;
1341
1342 generic_error_remove_page(mapping, page);
1343 unlock_page(page);
1344 }
1345 pagevec_release(&pvec);
1346 cond_resched();
1347 }
1348 }
1349
1350 /*
1351 * Invalidate inode pages in a worker thread. (This can't be done
1352 * in the message handler context.)
1353 */
1354 static void ceph_invalidate_work(struct work_struct *work)
1355 {
1356 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1357 i_pg_inv_work);
1358 struct inode *inode = &ci->vfs_inode;
1359 u32 orig_gen;
1360 int check = 0;
1361
1362 spin_lock(&inode->i_lock);
1363 dout("invalidate_pages %p gen %d revoking %d\n", inode,
1364 ci->i_rdcache_gen, ci->i_rdcache_revoking);
1365 if (ci->i_rdcache_gen == 0 ||
1366 ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1367 BUG_ON(ci->i_rdcache_revoking > ci->i_rdcache_gen);
1368 /* nevermind! */
1369 ci->i_rdcache_revoking = 0;
1370 spin_unlock(&inode->i_lock);
1371 goto out;
1372 }
1373 orig_gen = ci->i_rdcache_gen;
1374 spin_unlock(&inode->i_lock);
1375
1376 ceph_invalidate_nondirty_pages(inode->i_mapping);
1377
1378 spin_lock(&inode->i_lock);
1379 if (orig_gen == ci->i_rdcache_gen) {
1380 dout("invalidate_pages %p gen %d successful\n", inode,
1381 ci->i_rdcache_gen);
1382 ci->i_rdcache_gen = 0;
1383 ci->i_rdcache_revoking = 0;
1384 check = 1;
1385 } else {
1386 dout("invalidate_pages %p gen %d raced, gen now %d\n",
1387 inode, orig_gen, ci->i_rdcache_gen);
1388 }
1389 spin_unlock(&inode->i_lock);
1390
1391 if (check)
1392 ceph_check_caps(ci, 0, NULL);
1393 out:
1394 iput(inode);
1395 }
1396
1397
1398 /*
1399 * called by trunc_wq; take i_mutex ourselves
1400 *
1401 * We also truncate in a separate thread as well.
1402 */
1403 static void ceph_vmtruncate_work(struct work_struct *work)
1404 {
1405 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1406 i_vmtruncate_work);
1407 struct inode *inode = &ci->vfs_inode;
1408
1409 dout("vmtruncate_work %p\n", inode);
1410 mutex_lock(&inode->i_mutex);
1411 __ceph_do_pending_vmtruncate(inode);
1412 mutex_unlock(&inode->i_mutex);
1413 iput(inode);
1414 }
1415
1416 /*
1417 * Queue an async vmtruncate. If we fail to queue work, we will handle
1418 * the truncation the next time we call __ceph_do_pending_vmtruncate.
1419 */
1420 void ceph_queue_vmtruncate(struct inode *inode)
1421 {
1422 struct ceph_inode_info *ci = ceph_inode(inode);
1423
1424 if (queue_work(ceph_client(inode->i_sb)->trunc_wq,
1425 &ci->i_vmtruncate_work)) {
1426 dout("ceph_queue_vmtruncate %p\n", inode);
1427 igrab(inode);
1428 } else {
1429 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1430 inode, ci->i_truncate_pending);
1431 }
1432 }
1433
1434 /*
1435 * called with i_mutex held.
1436 *
1437 * Make sure any pending truncation is applied before doing anything
1438 * that may depend on it.
1439 */
1440 void __ceph_do_pending_vmtruncate(struct inode *inode)
1441 {
1442 struct ceph_inode_info *ci = ceph_inode(inode);
1443 u64 to;
1444 int wrbuffer_refs, wake = 0;
1445
1446 retry:
1447 spin_lock(&inode->i_lock);
1448 if (ci->i_truncate_pending == 0) {
1449 dout("__do_pending_vmtruncate %p none pending\n", inode);
1450 spin_unlock(&inode->i_lock);
1451 return;
1452 }
1453
1454 /*
1455 * make sure any dirty snapped pages are flushed before we
1456 * possibly truncate them.. so write AND block!
1457 */
1458 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1459 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1460 inode);
1461 spin_unlock(&inode->i_lock);
1462 filemap_write_and_wait_range(&inode->i_data, 0,
1463 inode->i_sb->s_maxbytes);
1464 goto retry;
1465 }
1466
1467 to = ci->i_truncate_size;
1468 wrbuffer_refs = ci->i_wrbuffer_ref;
1469 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1470 ci->i_truncate_pending, to);
1471 spin_unlock(&inode->i_lock);
1472
1473 truncate_inode_pages(inode->i_mapping, to);
1474
1475 spin_lock(&inode->i_lock);
1476 ci->i_truncate_pending--;
1477 if (ci->i_truncate_pending == 0)
1478 wake = 1;
1479 spin_unlock(&inode->i_lock);
1480
1481 if (wrbuffer_refs == 0)
1482 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1483 if (wake)
1484 wake_up(&ci->i_cap_wq);
1485 }
1486
1487
1488 /*
1489 * symlinks
1490 */
1491 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1492 {
1493 struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1494 nd_set_link(nd, ci->i_symlink);
1495 return NULL;
1496 }
1497
1498 static const struct inode_operations ceph_symlink_iops = {
1499 .readlink = generic_readlink,
1500 .follow_link = ceph_sym_follow_link,
1501 };
1502
1503 /*
1504 * setattr
1505 */
1506 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1507 {
1508 struct inode *inode = dentry->d_inode;
1509 struct ceph_inode_info *ci = ceph_inode(inode);
1510 struct inode *parent_inode = dentry->d_parent->d_inode;
1511 const unsigned int ia_valid = attr->ia_valid;
1512 struct ceph_mds_request *req;
1513 struct ceph_mds_client *mdsc = &ceph_client(dentry->d_sb)->mdsc;
1514 int issued;
1515 int release = 0, dirtied = 0;
1516 int mask = 0;
1517 int err = 0;
1518
1519 if (ceph_snap(inode) != CEPH_NOSNAP)
1520 return -EROFS;
1521
1522 __ceph_do_pending_vmtruncate(inode);
1523
1524 err = inode_change_ok(inode, attr);
1525 if (err != 0)
1526 return err;
1527
1528 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1529 USE_AUTH_MDS);
1530 if (IS_ERR(req))
1531 return PTR_ERR(req);
1532
1533 spin_lock(&inode->i_lock);
1534 issued = __ceph_caps_issued(ci, NULL);
1535 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1536
1537 if (ia_valid & ATTR_UID) {
1538 dout("setattr %p uid %d -> %d\n", inode,
1539 inode->i_uid, attr->ia_uid);
1540 if (issued & CEPH_CAP_AUTH_EXCL) {
1541 inode->i_uid = attr->ia_uid;
1542 dirtied |= CEPH_CAP_AUTH_EXCL;
1543 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1544 attr->ia_uid != inode->i_uid) {
1545 req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid);
1546 mask |= CEPH_SETATTR_UID;
1547 release |= CEPH_CAP_AUTH_SHARED;
1548 }
1549 }
1550 if (ia_valid & ATTR_GID) {
1551 dout("setattr %p gid %d -> %d\n", inode,
1552 inode->i_gid, attr->ia_gid);
1553 if (issued & CEPH_CAP_AUTH_EXCL) {
1554 inode->i_gid = attr->ia_gid;
1555 dirtied |= CEPH_CAP_AUTH_EXCL;
1556 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1557 attr->ia_gid != inode->i_gid) {
1558 req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid);
1559 mask |= CEPH_SETATTR_GID;
1560 release |= CEPH_CAP_AUTH_SHARED;
1561 }
1562 }
1563 if (ia_valid & ATTR_MODE) {
1564 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1565 attr->ia_mode);
1566 if (issued & CEPH_CAP_AUTH_EXCL) {
1567 inode->i_mode = attr->ia_mode;
1568 dirtied |= CEPH_CAP_AUTH_EXCL;
1569 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1570 attr->ia_mode != inode->i_mode) {
1571 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1572 mask |= CEPH_SETATTR_MODE;
1573 release |= CEPH_CAP_AUTH_SHARED;
1574 }
1575 }
1576
1577 if (ia_valid & ATTR_ATIME) {
1578 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1579 inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1580 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1581 if (issued & CEPH_CAP_FILE_EXCL) {
1582 ci->i_time_warp_seq++;
1583 inode->i_atime = attr->ia_atime;
1584 dirtied |= CEPH_CAP_FILE_EXCL;
1585 } else if ((issued & CEPH_CAP_FILE_WR) &&
1586 timespec_compare(&inode->i_atime,
1587 &attr->ia_atime) < 0) {
1588 inode->i_atime = attr->ia_atime;
1589 dirtied |= CEPH_CAP_FILE_WR;
1590 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1591 !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1592 ceph_encode_timespec(&req->r_args.setattr.atime,
1593 &attr->ia_atime);
1594 mask |= CEPH_SETATTR_ATIME;
1595 release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1596 CEPH_CAP_FILE_WR;
1597 }
1598 }
1599 if (ia_valid & ATTR_MTIME) {
1600 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1601 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1602 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1603 if (issued & CEPH_CAP_FILE_EXCL) {
1604 ci->i_time_warp_seq++;
1605 inode->i_mtime = attr->ia_mtime;
1606 dirtied |= CEPH_CAP_FILE_EXCL;
1607 } else if ((issued & CEPH_CAP_FILE_WR) &&
1608 timespec_compare(&inode->i_mtime,
1609 &attr->ia_mtime) < 0) {
1610 inode->i_mtime = attr->ia_mtime;
1611 dirtied |= CEPH_CAP_FILE_WR;
1612 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1613 !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1614 ceph_encode_timespec(&req->r_args.setattr.mtime,
1615 &attr->ia_mtime);
1616 mask |= CEPH_SETATTR_MTIME;
1617 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1618 CEPH_CAP_FILE_WR;
1619 }
1620 }
1621 if (ia_valid & ATTR_SIZE) {
1622 dout("setattr %p size %lld -> %lld\n", inode,
1623 inode->i_size, attr->ia_size);
1624 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1625 err = -EINVAL;
1626 goto out;
1627 }
1628 if ((issued & CEPH_CAP_FILE_EXCL) &&
1629 attr->ia_size > inode->i_size) {
1630 inode->i_size = attr->ia_size;
1631 inode->i_blocks =
1632 (attr->ia_size + (1 << 9) - 1) >> 9;
1633 inode->i_ctime = attr->ia_ctime;
1634 ci->i_reported_size = attr->ia_size;
1635 dirtied |= CEPH_CAP_FILE_EXCL;
1636 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1637 attr->ia_size != inode->i_size) {
1638 req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1639 req->r_args.setattr.old_size =
1640 cpu_to_le64(inode->i_size);
1641 mask |= CEPH_SETATTR_SIZE;
1642 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1643 CEPH_CAP_FILE_WR;
1644 }
1645 }
1646
1647 /* these do nothing */
1648 if (ia_valid & ATTR_CTIME) {
1649 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1650 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1651 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1652 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1653 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1654 only ? "ctime only" : "ignored");
1655 inode->i_ctime = attr->ia_ctime;
1656 if (only) {
1657 /*
1658 * if kernel wants to dirty ctime but nothing else,
1659 * we need to choose a cap to dirty under, or do
1660 * a almost-no-op setattr
1661 */
1662 if (issued & CEPH_CAP_AUTH_EXCL)
1663 dirtied |= CEPH_CAP_AUTH_EXCL;
1664 else if (issued & CEPH_CAP_FILE_EXCL)
1665 dirtied |= CEPH_CAP_FILE_EXCL;
1666 else if (issued & CEPH_CAP_XATTR_EXCL)
1667 dirtied |= CEPH_CAP_XATTR_EXCL;
1668 else
1669 mask |= CEPH_SETATTR_CTIME;
1670 }
1671 }
1672 if (ia_valid & ATTR_FILE)
1673 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1674
1675 if (dirtied) {
1676 __ceph_mark_dirty_caps(ci, dirtied);
1677 inode->i_ctime = CURRENT_TIME;
1678 }
1679
1680 release &= issued;
1681 spin_unlock(&inode->i_lock);
1682
1683 if (mask) {
1684 req->r_inode = igrab(inode);
1685 req->r_inode_drop = release;
1686 req->r_args.setattr.mask = cpu_to_le32(mask);
1687 req->r_num_caps = 1;
1688 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1689 }
1690 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1691 ceph_cap_string(dirtied), mask);
1692
1693 ceph_mdsc_put_request(req);
1694 __ceph_do_pending_vmtruncate(inode);
1695 return err;
1696 out:
1697 spin_unlock(&inode->i_lock);
1698 ceph_mdsc_put_request(req);
1699 return err;
1700 }
1701
1702 /*
1703 * Verify that we have a lease on the given mask. If not,
1704 * do a getattr against an mds.
1705 */
1706 int ceph_do_getattr(struct inode *inode, int mask)
1707 {
1708 struct ceph_client *client = ceph_sb_to_client(inode->i_sb);
1709 struct ceph_mds_client *mdsc = &client->mdsc;
1710 struct ceph_mds_request *req;
1711 int err;
1712
1713 if (ceph_snap(inode) == CEPH_SNAPDIR) {
1714 dout("do_getattr inode %p SNAPDIR\n", inode);
1715 return 0;
1716 }
1717
1718 dout("do_getattr inode %p mask %s\n", inode, ceph_cap_string(mask));
1719 if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1720 return 0;
1721
1722 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1723 if (IS_ERR(req))
1724 return PTR_ERR(req);
1725 req->r_inode = igrab(inode);
1726 req->r_num_caps = 1;
1727 req->r_args.getattr.mask = cpu_to_le32(mask);
1728 err = ceph_mdsc_do_request(mdsc, NULL, req);
1729 ceph_mdsc_put_request(req);
1730 dout("do_getattr result=%d\n", err);
1731 return err;
1732 }
1733
1734
1735 /*
1736 * Check inode permissions. We verify we have a valid value for
1737 * the AUTH cap, then call the generic handler.
1738 */
1739 int ceph_permission(struct inode *inode, int mask)
1740 {
1741 int err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1742
1743 if (!err)
1744 err = generic_permission(inode, mask, NULL);
1745 return err;
1746 }
1747
1748 /*
1749 * Get all attributes. Hopefully somedata we'll have a statlite()
1750 * and can limit the fields we require to be accurate.
1751 */
1752 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1753 struct kstat *stat)
1754 {
1755 struct inode *inode = dentry->d_inode;
1756 struct ceph_inode_info *ci = ceph_inode(inode);
1757 int err;
1758
1759 err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1760 if (!err) {
1761 generic_fillattr(inode, stat);
1762 stat->ino = inode->i_ino;
1763 if (ceph_snap(inode) != CEPH_NOSNAP)
1764 stat->dev = ceph_snap(inode);
1765 else
1766 stat->dev = 0;
1767 if (S_ISDIR(inode->i_mode)) {
1768 stat->size = ci->i_rbytes;
1769 stat->blocks = 0;
1770 stat->blksize = 65536;
1771 }
1772 }
1773 return err;
1774 }
Mirror of the linux-mips.org kernel tree