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Merge branch 'fix/hda' into for-linus
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ceph / inode.c
blobaca82d55cc53882a5fc3af08955e56a9f317e8cd
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 int i = 0;
890 int err = 0;
891
892 dout("fill_trace %p is_dentry %d is_target %d\n", req,
893 rinfo->head->is_dentry, rinfo->head->is_target);
894
895 #if 0
896 /*
897 * Debugging hook:
898 *
899 * If we resend completed ops to a recovering mds, we get no
900 * trace. Since that is very rare, pretend this is the case
901 * to ensure the 'no trace' handlers in the callers behave.
902 *
903 * Fill in inodes unconditionally to avoid breaking cap
904 * invariants.
905 */
906 if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
907 pr_info("fill_trace faking empty trace on %lld %s\n",
908 req->r_tid, ceph_mds_op_name(rinfo->head->op));
909 if (rinfo->head->is_dentry) {
910 rinfo->head->is_dentry = 0;
911 err = fill_inode(req->r_locked_dir,
912 &rinfo->diri, rinfo->dirfrag,
913 session, req->r_request_started, -1);
914 }
915 if (rinfo->head->is_target) {
916 rinfo->head->is_target = 0;
917 ininfo = rinfo->targeti.in;
918 vino.ino = le64_to_cpu(ininfo->ino);
919 vino.snap = le64_to_cpu(ininfo->snapid);
920 in = ceph_get_inode(sb, vino);
921 err = fill_inode(in, &rinfo->targeti, NULL,
922 session, req->r_request_started,
923 req->r_fmode);
924 iput(in);
925 }
926 }
927 #endif
928
929 if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
930 dout("fill_trace reply is empty!\n");
931 if (rinfo->head->result == 0 && req->r_locked_dir) {
932 struct ceph_inode_info *ci =
933 ceph_inode(req->r_locked_dir);
934 dout(" clearing %p complete (empty trace)\n",
935 req->r_locked_dir);
936 ci->i_ceph_flags &= ~CEPH_I_COMPLETE;
937 ci->i_release_count++;
938 }
939 return 0;
940 }
941
942 if (rinfo->head->is_dentry) {
943 struct inode *dir = req->r_locked_dir;
944
945 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
946 session, req->r_request_started, -1,
947 &req->r_caps_reservation);
948 if (err < 0)
949 return err;
950 }
951
952 if (rinfo->head->is_dentry && !req->r_aborted) {
953 /*
954 * lookup link rename : null -> possibly existing inode
955 * mknod symlink mkdir : null -> new inode
956 * unlink : linked -> null
957 */
958 struct inode *dir = req->r_locked_dir;
959 struct dentry *dn = req->r_dentry;
960 bool have_dir_cap, have_lease;
961
962 BUG_ON(!dn);
963 BUG_ON(!dir);
964 BUG_ON(dn->d_parent->d_inode != dir);
965 BUG_ON(ceph_ino(dir) !=
966 le64_to_cpu(rinfo->diri.in->ino));
967 BUG_ON(ceph_snap(dir) !=
968 le64_to_cpu(rinfo->diri.in->snapid));
969
970 /* do we have a lease on the whole dir? */
971 have_dir_cap =
972 (le32_to_cpu(rinfo->diri.in->cap.caps) &
973 CEPH_CAP_FILE_SHARED);
974
975 /* do we have a dn lease? */
976 have_lease = have_dir_cap ||
977 (le16_to_cpu(rinfo->dlease->mask) &
978 CEPH_LOCK_DN);
979
980 if (!have_lease)
981 dout("fill_trace no dentry lease or dir cap\n");
982
983 /* rename? */
984 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
985 dout(" src %p '%.*s' dst %p '%.*s'\n",
986 req->r_old_dentry,
987 req->r_old_dentry->d_name.len,
988 req->r_old_dentry->d_name.name,
989 dn, dn->d_name.len, dn->d_name.name);
990 dout("fill_trace doing d_move %p -> %p\n",
991 req->r_old_dentry, dn);
992 d_move(req->r_old_dentry, dn);
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 /* ensure target dentry is invalidated, despite
999 rehashing bug in vfs_rename_dir */
1000 dn->d_time = jiffies;
1001 ceph_dentry(dn)->lease_shared_gen = 0;
1002 /* take overwritten dentry's readdir offset */
1003 ceph_dentry(req->r_old_dentry)->offset =
1004 ceph_dentry(dn)->offset;
1005 dn = req->r_old_dentry; /* use old_dentry */
1006 in = dn->d_inode;
1007 }
1008
1009 /* null dentry? */
1010 if (!rinfo->head->is_target) {
1011 dout("fill_trace null dentry\n");
1012 if (dn->d_inode) {
1013 dout("d_delete %p\n", dn);
1014 d_delete(dn);
1015 } else {
1016 dout("d_instantiate %p NULL\n", dn);
1017 d_instantiate(dn, NULL);
1018 if (have_lease && d_unhashed(dn))
1019 d_rehash(dn);
1020 update_dentry_lease(dn, rinfo->dlease,
1021 session,
1022 req->r_request_started);
1023 }
1024 goto done;
1025 }
1026
1027 /* attach proper inode */
1028 ininfo = rinfo->targeti.in;
1029 vino.ino = le64_to_cpu(ininfo->ino);
1030 vino.snap = le64_to_cpu(ininfo->snapid);
1031 if (!dn->d_inode) {
1032 in = ceph_get_inode(sb, vino);
1033 if (IS_ERR(in)) {
1034 pr_err("fill_trace bad get_inode "
1035 "%llx.%llx\n", vino.ino, vino.snap);
1036 err = PTR_ERR(in);
1037 d_delete(dn);
1038 goto done;
1039 }
1040 dn = splice_dentry(dn, in, &have_lease);
1041 if (IS_ERR(dn)) {
1042 err = PTR_ERR(dn);
1043 goto done;
1044 }
1045 req->r_dentry = dn; /* may have spliced */
1046 ceph_set_dentry_offset(dn);
1047 igrab(in);
1048 } else if (ceph_ino(in) == vino.ino &&
1049 ceph_snap(in) == vino.snap) {
1050 igrab(in);
1051 } else {
1052 dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1053 dn, in, ceph_ino(in), ceph_snap(in),
1054 vino.ino, vino.snap);
1055 have_lease = false;
1056 in = NULL;
1057 }
1058
1059 if (have_lease)
1060 update_dentry_lease(dn, rinfo->dlease, session,
1061 req->r_request_started);
1062 dout(" final dn %p\n", dn);
1063 i++;
1064 } else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1065 req->r_op == CEPH_MDS_OP_MKSNAP) {
1066 struct dentry *dn = req->r_dentry;
1067
1068 /* fill out a snapdir LOOKUPSNAP dentry */
1069 BUG_ON(!dn);
1070 BUG_ON(!req->r_locked_dir);
1071 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1072 ininfo = rinfo->targeti.in;
1073 vino.ino = le64_to_cpu(ininfo->ino);
1074 vino.snap = le64_to_cpu(ininfo->snapid);
1075 in = ceph_get_inode(sb, vino);
1076 if (IS_ERR(in)) {
1077 pr_err("fill_inode get_inode badness %llx.%llx\n",
1078 vino.ino, vino.snap);
1079 err = PTR_ERR(in);
1080 d_delete(dn);
1081 goto done;
1082 }
1083 dout(" linking snapped dir %p to dn %p\n", in, dn);
1084 dn = splice_dentry(dn, in, NULL);
1085 if (IS_ERR(dn)) {
1086 err = PTR_ERR(dn);
1087 goto done;
1088 }
1089 ceph_set_dentry_offset(dn);
1090 req->r_dentry = dn; /* may have spliced */
1091 igrab(in);
1092 rinfo->head->is_dentry = 1; /* fool notrace handlers */
1093 }
1094
1095 if (rinfo->head->is_target) {
1096 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1097 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1098
1099 if (in == NULL || ceph_ino(in) != vino.ino ||
1100 ceph_snap(in) != vino.snap) {
1101 in = ceph_get_inode(sb, vino);
1102 if (IS_ERR(in)) {
1103 err = PTR_ERR(in);
1104 goto done;
1105 }
1106 }
1107 req->r_target_inode = in;
1108
1109 err = fill_inode(in,
1110 &rinfo->targeti, NULL,
1111 session, req->r_request_started,
1112 (le32_to_cpu(rinfo->head->result) == 0) ?
1113 req->r_fmode : -1,
1114 &req->r_caps_reservation);
1115 if (err < 0) {
1116 pr_err("fill_inode badness %p %llx.%llx\n",
1117 in, ceph_vinop(in));
1118 goto done;
1119 }
1120 }
1121
1122 done:
1123 dout("fill_trace done err=%d\n", err);
1124 return err;
1125 }
1126
1127 /*
1128 * Prepopulate our cache with readdir results, leases, etc.
1129 */
1130 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1131 struct ceph_mds_session *session)
1132 {
1133 struct dentry *parent = req->r_dentry;
1134 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1135 struct qstr dname;
1136 struct dentry *dn;
1137 struct inode *in;
1138 int err = 0, i;
1139 struct inode *snapdir = NULL;
1140 struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1141 u64 frag = le32_to_cpu(rhead->args.readdir.frag);
1142 struct ceph_dentry_info *di;
1143
1144 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1145 snapdir = ceph_get_snapdir(parent->d_inode);
1146 parent = d_find_alias(snapdir);
1147 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1148 rinfo->dir_nr, parent);
1149 } else {
1150 dout("readdir_prepopulate %d items under dn %p\n",
1151 rinfo->dir_nr, parent);
1152 if (rinfo->dir_dir)
1153 ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1154 }
1155
1156 for (i = 0; i < rinfo->dir_nr; i++) {
1157 struct ceph_vino vino;
1158
1159 dname.name = rinfo->dir_dname[i];
1160 dname.len = rinfo->dir_dname_len[i];
1161 dname.hash = full_name_hash(dname.name, dname.len);
1162
1163 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1164 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1165
1166 retry_lookup:
1167 dn = d_lookup(parent, &dname);
1168 dout("d_lookup on parent=%p name=%.*s got %p\n",
1169 parent, dname.len, dname.name, dn);
1170
1171 if (!dn) {
1172 dn = d_alloc(parent, &dname);
1173 dout("d_alloc %p '%.*s' = %p\n", parent,
1174 dname.len, dname.name, dn);
1175 if (dn == NULL) {
1176 dout("d_alloc badness\n");
1177 err = -ENOMEM;
1178 goto out;
1179 }
1180 err = ceph_init_dentry(dn);
1181 if (err < 0)
1182 goto out;
1183 } else if (dn->d_inode &&
1184 (ceph_ino(dn->d_inode) != vino.ino ||
1185 ceph_snap(dn->d_inode) != vino.snap)) {
1186 dout(" dn %p points to wrong inode %p\n",
1187 dn, dn->d_inode);
1188 d_delete(dn);
1189 dput(dn);
1190 goto retry_lookup;
1191 } else {
1192 /* reorder parent's d_subdirs */
1193 spin_lock(&dcache_lock);
1194 spin_lock(&dn->d_lock);
1195 list_move(&dn->d_u.d_child, &parent->d_subdirs);
1196 spin_unlock(&dn->d_lock);
1197 spin_unlock(&dcache_lock);
1198 }
1199
1200 di = dn->d_fsdata;
1201 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1202
1203 /* inode */
1204 if (dn->d_inode) {
1205 in = dn->d_inode;
1206 } else {
1207 in = ceph_get_inode(parent->d_sb, vino);
1208 if (in == NULL) {
1209 dout("new_inode badness\n");
1210 d_delete(dn);
1211 dput(dn);
1212 err = -ENOMEM;
1213 goto out;
1214 }
1215 dn = splice_dentry(dn, in, NULL);
1216 }
1217
1218 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1219 req->r_request_started, -1,
1220 &req->r_caps_reservation) < 0) {
1221 pr_err("fill_inode badness on %p\n", in);
1222 dput(dn);
1223 continue;
1224 }
1225 update_dentry_lease(dn, rinfo->dir_dlease[i],
1226 req->r_session, req->r_request_started);
1227 dput(dn);
1228 }
1229 req->r_did_prepopulate = true;
1230
1231 out:
1232 if (snapdir) {
1233 iput(snapdir);
1234 dput(parent);
1235 }
1236 dout("readdir_prepopulate done\n");
1237 return err;
1238 }
1239
1240 int ceph_inode_set_size(struct inode *inode, loff_t size)
1241 {
1242 struct ceph_inode_info *ci = ceph_inode(inode);
1243 int ret = 0;
1244
1245 spin_lock(&inode->i_lock);
1246 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1247 inode->i_size = size;
1248 inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1249
1250 /* tell the MDS if we are approaching max_size */
1251 if ((size << 1) >= ci->i_max_size &&
1252 (ci->i_reported_size << 1) < ci->i_max_size)
1253 ret = 1;
1254
1255 spin_unlock(&inode->i_lock);
1256 return ret;
1257 }
1258
1259 /*
1260 * Write back inode data in a worker thread. (This can't be done
1261 * in the message handler context.)
1262 */
1263 void ceph_queue_writeback(struct inode *inode)
1264 {
1265 if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1266 &ceph_inode(inode)->i_wb_work)) {
1267 dout("ceph_queue_writeback %p\n", inode);
1268 igrab(inode);
1269 } else {
1270 dout("ceph_queue_writeback %p failed\n", inode);
1271 }
1272 }
1273
1274 static void ceph_writeback_work(struct work_struct *work)
1275 {
1276 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1277 i_wb_work);
1278 struct inode *inode = &ci->vfs_inode;
1279
1280 dout("writeback %p\n", inode);
1281 filemap_fdatawrite(&inode->i_data);
1282 iput(inode);
1283 }
1284
1285 /*
1286 * queue an async invalidation
1287 */
1288 void ceph_queue_invalidate(struct inode *inode)
1289 {
1290 if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1291 &ceph_inode(inode)->i_pg_inv_work)) {
1292 dout("ceph_queue_invalidate %p\n", inode);
1293 igrab(inode);
1294 } else {
1295 dout("ceph_queue_invalidate %p failed\n", inode);
1296 }
1297 }
1298
1299 /*
1300 * invalidate any pages that are not dirty or under writeback. this
1301 * includes pages that are clean and mapped.
1302 */
1303 static void ceph_invalidate_nondirty_pages(struct address_space *mapping)
1304 {
1305 struct pagevec pvec;
1306 pgoff_t next = 0;
1307 int i;
1308
1309 pagevec_init(&pvec, 0);
1310 while (pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
1311 for (i = 0; i < pagevec_count(&pvec); i++) {
1312 struct page *page = pvec.pages[i];
1313 pgoff_t index;
1314 int skip_page =
1315 (PageDirty(page) || PageWriteback(page));
1316
1317 if (!skip_page)
1318 skip_page = !trylock_page(page);
1319
1320 /*
1321 * We really shouldn't be looking at the ->index of an
1322 * unlocked page. But we're not allowed to lock these
1323 * pages. So we rely upon nobody altering the ->index
1324 * of this (pinned-by-us) page.
1325 */
1326 index = page->index;
1327 if (index > next)
1328 next = index;
1329 next++;
1330
1331 if (skip_page)
1332 continue;
1333
1334 generic_error_remove_page(mapping, page);
1335 unlock_page(page);
1336 }
1337 pagevec_release(&pvec);
1338 cond_resched();
1339 }
1340 }
1341
1342 /*
1343 * Invalidate inode pages in a worker thread. (This can't be done
1344 * in the message handler context.)
1345 */
1346 static void ceph_invalidate_work(struct work_struct *work)
1347 {
1348 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1349 i_pg_inv_work);
1350 struct inode *inode = &ci->vfs_inode;
1351 u32 orig_gen;
1352 int check = 0;
1353
1354 spin_lock(&inode->i_lock);
1355 dout("invalidate_pages %p gen %d revoking %d\n", inode,
1356 ci->i_rdcache_gen, ci->i_rdcache_revoking);
1357 if (ci->i_rdcache_gen == 0 ||
1358 ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1359 BUG_ON(ci->i_rdcache_revoking > ci->i_rdcache_gen);
1360 /* nevermind! */
1361 ci->i_rdcache_revoking = 0;
1362 spin_unlock(&inode->i_lock);
1363 goto out;
1364 }
1365 orig_gen = ci->i_rdcache_gen;
1366 spin_unlock(&inode->i_lock);
1367
1368 ceph_invalidate_nondirty_pages(inode->i_mapping);
1369
1370 spin_lock(&inode->i_lock);
1371 if (orig_gen == ci->i_rdcache_gen) {
1372 dout("invalidate_pages %p gen %d successful\n", inode,
1373 ci->i_rdcache_gen);
1374 ci->i_rdcache_gen = 0;
1375 ci->i_rdcache_revoking = 0;
1376 check = 1;
1377 } else {
1378 dout("invalidate_pages %p gen %d raced, gen now %d\n",
1379 inode, orig_gen, ci->i_rdcache_gen);
1380 }
1381 spin_unlock(&inode->i_lock);
1382
1383 if (check)
1384 ceph_check_caps(ci, 0, NULL);
1385 out:
1386 iput(inode);
1387 }
1388
1389
1390 /*
1391 * called by trunc_wq; take i_mutex ourselves
1392 *
1393 * We also truncate in a separate thread as well.
1394 */
1395 static void ceph_vmtruncate_work(struct work_struct *work)
1396 {
1397 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1398 i_vmtruncate_work);
1399 struct inode *inode = &ci->vfs_inode;
1400
1401 dout("vmtruncate_work %p\n", inode);
1402 mutex_lock(&inode->i_mutex);
1403 __ceph_do_pending_vmtruncate(inode);
1404 mutex_unlock(&inode->i_mutex);
1405 iput(inode);
1406 }
1407
1408 /*
1409 * Queue an async vmtruncate. If we fail to queue work, we will handle
1410 * the truncation the next time we call __ceph_do_pending_vmtruncate.
1411 */
1412 void ceph_queue_vmtruncate(struct inode *inode)
1413 {
1414 struct ceph_inode_info *ci = ceph_inode(inode);
1415
1416 if (queue_work(ceph_client(inode->i_sb)->trunc_wq,
1417 &ci->i_vmtruncate_work)) {
1418 dout("ceph_queue_vmtruncate %p\n", inode);
1419 igrab(inode);
1420 } else {
1421 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1422 inode, ci->i_truncate_pending);
1423 }
1424 }
1425
1426 /*
1427 * called with i_mutex held.
1428 *
1429 * Make sure any pending truncation is applied before doing anything
1430 * that may depend on it.
1431 */
1432 void __ceph_do_pending_vmtruncate(struct inode *inode)
1433 {
1434 struct ceph_inode_info *ci = ceph_inode(inode);
1435 u64 to;
1436 int wrbuffer_refs, wake = 0;
1437
1438 retry:
1439 spin_lock(&inode->i_lock);
1440 if (ci->i_truncate_pending == 0) {
1441 dout("__do_pending_vmtruncate %p none pending\n", inode);
1442 spin_unlock(&inode->i_lock);
1443 return;
1444 }
1445
1446 /*
1447 * make sure any dirty snapped pages are flushed before we
1448 * possibly truncate them.. so write AND block!
1449 */
1450 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1451 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1452 inode);
1453 spin_unlock(&inode->i_lock);
1454 filemap_write_and_wait_range(&inode->i_data, 0,
1455 inode->i_sb->s_maxbytes);
1456 goto retry;
1457 }
1458
1459 to = ci->i_truncate_size;
1460 wrbuffer_refs = ci->i_wrbuffer_ref;
1461 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1462 ci->i_truncate_pending, to);
1463 spin_unlock(&inode->i_lock);
1464
1465 truncate_inode_pages(inode->i_mapping, to);
1466
1467 spin_lock(&inode->i_lock);
1468 ci->i_truncate_pending--;
1469 if (ci->i_truncate_pending == 0)
1470 wake = 1;
1471 spin_unlock(&inode->i_lock);
1472
1473 if (wrbuffer_refs == 0)
1474 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1475 if (wake)
1476 wake_up(&ci->i_cap_wq);
1477 }
1478
1479
1480 /*
1481 * symlinks
1482 */
1483 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1484 {
1485 struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1486 nd_set_link(nd, ci->i_symlink);
1487 return NULL;
1488 }
1489
1490 static const struct inode_operations ceph_symlink_iops = {
1491 .readlink = generic_readlink,
1492 .follow_link = ceph_sym_follow_link,
1493 };
1494
1495 /*
1496 * setattr
1497 */
1498 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1499 {
1500 struct inode *inode = dentry->d_inode;
1501 struct ceph_inode_info *ci = ceph_inode(inode);
1502 struct inode *parent_inode = dentry->d_parent->d_inode;
1503 const unsigned int ia_valid = attr->ia_valid;
1504 struct ceph_mds_request *req;
1505 struct ceph_mds_client *mdsc = &ceph_client(dentry->d_sb)->mdsc;
1506 int issued;
1507 int release = 0, dirtied = 0;
1508 int mask = 0;
1509 int err = 0;
1510
1511 if (ceph_snap(inode) != CEPH_NOSNAP)
1512 return -EROFS;
1513
1514 __ceph_do_pending_vmtruncate(inode);
1515
1516 err = inode_change_ok(inode, attr);
1517 if (err != 0)
1518 return err;
1519
1520 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1521 USE_AUTH_MDS);
1522 if (IS_ERR(req))
1523 return PTR_ERR(req);
1524
1525 spin_lock(&inode->i_lock);
1526 issued = __ceph_caps_issued(ci, NULL);
1527 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1528
1529 if (ia_valid & ATTR_UID) {
1530 dout("setattr %p uid %d -> %d\n", inode,
1531 inode->i_uid, attr->ia_uid);
1532 if (issued & CEPH_CAP_AUTH_EXCL) {
1533 inode->i_uid = attr->ia_uid;
1534 dirtied |= CEPH_CAP_AUTH_EXCL;
1535 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1536 attr->ia_uid != inode->i_uid) {
1537 req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid);
1538 mask |= CEPH_SETATTR_UID;
1539 release |= CEPH_CAP_AUTH_SHARED;
1540 }
1541 }
1542 if (ia_valid & ATTR_GID) {
1543 dout("setattr %p gid %d -> %d\n", inode,
1544 inode->i_gid, attr->ia_gid);
1545 if (issued & CEPH_CAP_AUTH_EXCL) {
1546 inode->i_gid = attr->ia_gid;
1547 dirtied |= CEPH_CAP_AUTH_EXCL;
1548 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1549 attr->ia_gid != inode->i_gid) {
1550 req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid);
1551 mask |= CEPH_SETATTR_GID;
1552 release |= CEPH_CAP_AUTH_SHARED;
1553 }
1554 }
1555 if (ia_valid & ATTR_MODE) {
1556 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1557 attr->ia_mode);
1558 if (issued & CEPH_CAP_AUTH_EXCL) {
1559 inode->i_mode = attr->ia_mode;
1560 dirtied |= CEPH_CAP_AUTH_EXCL;
1561 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1562 attr->ia_mode != inode->i_mode) {
1563 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1564 mask |= CEPH_SETATTR_MODE;
1565 release |= CEPH_CAP_AUTH_SHARED;
1566 }
1567 }
1568
1569 if (ia_valid & ATTR_ATIME) {
1570 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1571 inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1572 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1573 if (issued & CEPH_CAP_FILE_EXCL) {
1574 ci->i_time_warp_seq++;
1575 inode->i_atime = attr->ia_atime;
1576 dirtied |= CEPH_CAP_FILE_EXCL;
1577 } else if ((issued & CEPH_CAP_FILE_WR) &&
1578 timespec_compare(&inode->i_atime,
1579 &attr->ia_atime) < 0) {
1580 inode->i_atime = attr->ia_atime;
1581 dirtied |= CEPH_CAP_FILE_WR;
1582 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1583 !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1584 ceph_encode_timespec(&req->r_args.setattr.atime,
1585 &attr->ia_atime);
1586 mask |= CEPH_SETATTR_ATIME;
1587 release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1588 CEPH_CAP_FILE_WR;
1589 }
1590 }
1591 if (ia_valid & ATTR_MTIME) {
1592 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1593 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1594 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1595 if (issued & CEPH_CAP_FILE_EXCL) {
1596 ci->i_time_warp_seq++;
1597 inode->i_mtime = attr->ia_mtime;
1598 dirtied |= CEPH_CAP_FILE_EXCL;
1599 } else if ((issued & CEPH_CAP_FILE_WR) &&
1600 timespec_compare(&inode->i_mtime,
1601 &attr->ia_mtime) < 0) {
1602 inode->i_mtime = attr->ia_mtime;
1603 dirtied |= CEPH_CAP_FILE_WR;
1604 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1605 !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1606 ceph_encode_timespec(&req->r_args.setattr.mtime,
1607 &attr->ia_mtime);
1608 mask |= CEPH_SETATTR_MTIME;
1609 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1610 CEPH_CAP_FILE_WR;
1611 }
1612 }
1613 if (ia_valid & ATTR_SIZE) {
1614 dout("setattr %p size %lld -> %lld\n", inode,
1615 inode->i_size, attr->ia_size);
1616 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1617 err = -EINVAL;
1618 goto out;
1619 }
1620 if ((issued & CEPH_CAP_FILE_EXCL) &&
1621 attr->ia_size > inode->i_size) {
1622 inode->i_size = attr->ia_size;
1623 inode->i_blocks =
1624 (attr->ia_size + (1 << 9) - 1) >> 9;
1625 inode->i_ctime = attr->ia_ctime;
1626 ci->i_reported_size = attr->ia_size;
1627 dirtied |= CEPH_CAP_FILE_EXCL;
1628 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1629 attr->ia_size != inode->i_size) {
1630 req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1631 req->r_args.setattr.old_size =
1632 cpu_to_le64(inode->i_size);
1633 mask |= CEPH_SETATTR_SIZE;
1634 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1635 CEPH_CAP_FILE_WR;
1636 }
1637 }
1638
1639 /* these do nothing */
1640 if (ia_valid & ATTR_CTIME) {
1641 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1642 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1643 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1644 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1645 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1646 only ? "ctime only" : "ignored");
1647 inode->i_ctime = attr->ia_ctime;
1648 if (only) {
1649 /*
1650 * if kernel wants to dirty ctime but nothing else,
1651 * we need to choose a cap to dirty under, or do
1652 * a almost-no-op setattr
1653 */
1654 if (issued & CEPH_CAP_AUTH_EXCL)
1655 dirtied |= CEPH_CAP_AUTH_EXCL;
1656 else if (issued & CEPH_CAP_FILE_EXCL)
1657 dirtied |= CEPH_CAP_FILE_EXCL;
1658 else if (issued & CEPH_CAP_XATTR_EXCL)
1659 dirtied |= CEPH_CAP_XATTR_EXCL;
1660 else
1661 mask |= CEPH_SETATTR_CTIME;
1662 }
1663 }
1664 if (ia_valid & ATTR_FILE)
1665 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1666
1667 if (dirtied) {
1668 __ceph_mark_dirty_caps(ci, dirtied);
1669 inode->i_ctime = CURRENT_TIME;
1670 }
1671
1672 release &= issued;
1673 spin_unlock(&inode->i_lock);
1674
1675 if (mask) {
1676 req->r_inode = igrab(inode);
1677 req->r_inode_drop = release;
1678 req->r_args.setattr.mask = cpu_to_le32(mask);
1679 req->r_num_caps = 1;
1680 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1681 }
1682 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1683 ceph_cap_string(dirtied), mask);
1684
1685 ceph_mdsc_put_request(req);
1686 __ceph_do_pending_vmtruncate(inode);
1687 return err;
1688 out:
1689 spin_unlock(&inode->i_lock);
1690 ceph_mdsc_put_request(req);
1691 return err;
1692 }
1693
1694 /*
1695 * Verify that we have a lease on the given mask. If not,
1696 * do a getattr against an mds.
1697 */
1698 int ceph_do_getattr(struct inode *inode, int mask)
1699 {
1700 struct ceph_client *client = ceph_sb_to_client(inode->i_sb);
1701 struct ceph_mds_client *mdsc = &client->mdsc;
1702 struct ceph_mds_request *req;
1703 int err;
1704
1705 if (ceph_snap(inode) == CEPH_SNAPDIR) {
1706 dout("do_getattr inode %p SNAPDIR\n", inode);
1707 return 0;
1708 }
1709
1710 dout("do_getattr inode %p mask %s\n", inode, ceph_cap_string(mask));
1711 if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1712 return 0;
1713
1714 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1715 if (IS_ERR(req))
1716 return PTR_ERR(req);
1717 req->r_inode = igrab(inode);
1718 req->r_num_caps = 1;
1719 req->r_args.getattr.mask = cpu_to_le32(mask);
1720 err = ceph_mdsc_do_request(mdsc, NULL, req);
1721 ceph_mdsc_put_request(req);
1722 dout("do_getattr result=%d\n", err);
1723 return err;
1724 }
1725
1726
1727 /*
1728 * Check inode permissions. We verify we have a valid value for
1729 * the AUTH cap, then call the generic handler.
1730 */
1731 int ceph_permission(struct inode *inode, int mask)
1732 {
1733 int err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1734
1735 if (!err)
1736 err = generic_permission(inode, mask, NULL);
1737 return err;
1738 }
1739
1740 /*
1741 * Get all attributes. Hopefully somedata we'll have a statlite()
1742 * and can limit the fields we require to be accurate.
1743 */
1744 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1745 struct kstat *stat)
1746 {
1747 struct inode *inode = dentry->d_inode;
1748 struct ceph_inode_info *ci = ceph_inode(inode);
1749 int err;
1750
1751 err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1752 if (!err) {
1753 generic_fillattr(inode, stat);
1754 stat->ino = inode->i_ino;
1755 if (ceph_snap(inode) != CEPH_NOSNAP)
1756 stat->dev = ceph_snap(inode);
1757 else
1758 stat->dev = 0;
1759 if (S_ISDIR(inode->i_mode)) {
1760 stat->size = ci->i_rbytes;
1761 stat->blocks = 0;
1762 stat->blksize = 65536;
1763 }
1764 }
1765 return err;
1766 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree