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ptrace: cleanup arch_ptrace() on sh
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ceph / inode.c
blob1d6a45b5a04c696591879d141165627746d6a476
1 #include <linux/ceph/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 "mds_client.h"
17 #include <linux/ceph/decode.h>
18
19 /*
20 * Ceph inode operations
21 *
22 * Implement basic inode helpers (get, alloc) and inode ops (getattr,
23 * setattr, etc.), xattr helpers, and helpers for assimilating
24 * metadata returned by the MDS into our cache.
25 *
26 * Also define helpers for doing asynchronous writeback, invalidation,
27 * and truncation for the benefit of those who can't afford to block
28 * (typically because they are in the message handler path).
29 */
30
31 static const struct inode_operations ceph_symlink_iops;
32
33 static void ceph_invalidate_work(struct work_struct *work);
34 static void ceph_writeback_work(struct work_struct *work);
35 static void ceph_vmtruncate_work(struct work_struct *work);
36
37 /*
38 * find or create an inode, given the ceph ino number
39 */
40 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
41 {
42 struct inode *inode;
43 ino_t t = ceph_vino_to_ino(vino);
44
45 inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino);
46 if (inode == NULL)
47 return ERR_PTR(-ENOMEM);
48 if (inode->i_state & I_NEW) {
49 dout("get_inode created new inode %p %llx.%llx ino %llx\n",
50 inode, ceph_vinop(inode), (u64)inode->i_ino);
51 unlock_new_inode(inode);
52 }
53
54 dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino,
55 vino.snap, inode);
56 return inode;
57 }
58
59 /*
60 * get/constuct snapdir inode for a given directory
61 */
62 struct inode *ceph_get_snapdir(struct inode *parent)
63 {
64 struct ceph_vino vino = {
65 .ino = ceph_ino(parent),
66 .snap = CEPH_SNAPDIR,
67 };
68 struct inode *inode = ceph_get_inode(parent->i_sb, vino);
69 struct ceph_inode_info *ci = ceph_inode(inode);
70
71 BUG_ON(!S_ISDIR(parent->i_mode));
72 if (IS_ERR(inode))
73 return inode;
74 inode->i_mode = parent->i_mode;
75 inode->i_uid = parent->i_uid;
76 inode->i_gid = parent->i_gid;
77 inode->i_op = &ceph_dir_iops;
78 inode->i_fop = &ceph_dir_fops;
79 ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
80 ci->i_rbytes = 0;
81 return inode;
82 }
83
84 const struct inode_operations ceph_file_iops = {
85 .permission = ceph_permission,
86 .setattr = ceph_setattr,
87 .getattr = ceph_getattr,
88 .setxattr = ceph_setxattr,
89 .getxattr = ceph_getxattr,
90 .listxattr = ceph_listxattr,
91 .removexattr = ceph_removexattr,
92 };
93
94
95 /*
96 * We use a 'frag tree' to keep track of the MDS's directory fragments
97 * for a given inode (usually there is just a single fragment). We
98 * need to know when a child frag is delegated to a new MDS, or when
99 * it is flagged as replicated, so we can direct our requests
100 * accordingly.
101 */
102
103 /*
104 * find/create a frag in the tree
105 */
106 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
107 u32 f)
108 {
109 struct rb_node **p;
110 struct rb_node *parent = NULL;
111 struct ceph_inode_frag *frag;
112 int c;
113
114 p = &ci->i_fragtree.rb_node;
115 while (*p) {
116 parent = *p;
117 frag = rb_entry(parent, struct ceph_inode_frag, node);
118 c = ceph_frag_compare(f, frag->frag);
119 if (c < 0)
120 p = &(*p)->rb_left;
121 else if (c > 0)
122 p = &(*p)->rb_right;
123 else
124 return frag;
125 }
126
127 frag = kmalloc(sizeof(*frag), GFP_NOFS);
128 if (!frag) {
129 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx "
130 "frag %x\n", &ci->vfs_inode,
131 ceph_vinop(&ci->vfs_inode), f);
132 return ERR_PTR(-ENOMEM);
133 }
134 frag->frag = f;
135 frag->split_by = 0;
136 frag->mds = -1;
137 frag->ndist = 0;
138
139 rb_link_node(&frag->node, parent, p);
140 rb_insert_color(&frag->node, &ci->i_fragtree);
141
142 dout("get_or_create_frag added %llx.%llx frag %x\n",
143 ceph_vinop(&ci->vfs_inode), f);
144 return frag;
145 }
146
147 /*
148 * find a specific frag @f
149 */
150 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
151 {
152 struct rb_node *n = ci->i_fragtree.rb_node;
153
154 while (n) {
155 struct ceph_inode_frag *frag =
156 rb_entry(n, struct ceph_inode_frag, node);
157 int c = ceph_frag_compare(f, frag->frag);
158 if (c < 0)
159 n = n->rb_left;
160 else if (c > 0)
161 n = n->rb_right;
162 else
163 return frag;
164 }
165 return NULL;
166 }
167
168 /*
169 * Choose frag containing the given value @v. If @pfrag is
170 * specified, copy the frag delegation info to the caller if
171 * it is present.
172 */
173 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
174 struct ceph_inode_frag *pfrag,
175 int *found)
176 {
177 u32 t = ceph_frag_make(0, 0);
178 struct ceph_inode_frag *frag;
179 unsigned nway, i;
180 u32 n;
181
182 if (found)
183 *found = 0;
184
185 mutex_lock(&ci->i_fragtree_mutex);
186 while (1) {
187 WARN_ON(!ceph_frag_contains_value(t, v));
188 frag = __ceph_find_frag(ci, t);
189 if (!frag)
190 break; /* t is a leaf */
191 if (frag->split_by == 0) {
192 if (pfrag)
193 memcpy(pfrag, frag, sizeof(*pfrag));
194 if (found)
195 *found = 1;
196 break;
197 }
198
199 /* choose child */
200 nway = 1 << frag->split_by;
201 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
202 frag->split_by, nway);
203 for (i = 0; i < nway; i++) {
204 n = ceph_frag_make_child(t, frag->split_by, i);
205 if (ceph_frag_contains_value(n, v)) {
206 t = n;
207 break;
208 }
209 }
210 BUG_ON(i == nway);
211 }
212 dout("choose_frag(%x) = %x\n", v, t);
213
214 mutex_unlock(&ci->i_fragtree_mutex);
215 return t;
216 }
217
218 /*
219 * Process dirfrag (delegation) info from the mds. Include leaf
220 * fragment in tree ONLY if ndist > 0. Otherwise, only
221 * branches/splits are included in i_fragtree)
222 */
223 static int ceph_fill_dirfrag(struct inode *inode,
224 struct ceph_mds_reply_dirfrag *dirinfo)
225 {
226 struct ceph_inode_info *ci = ceph_inode(inode);
227 struct ceph_inode_frag *frag;
228 u32 id = le32_to_cpu(dirinfo->frag);
229 int mds = le32_to_cpu(dirinfo->auth);
230 int ndist = le32_to_cpu(dirinfo->ndist);
231 int i;
232 int err = 0;
233
234 mutex_lock(&ci->i_fragtree_mutex);
235 if (ndist == 0) {
236 /* no delegation info needed. */
237 frag = __ceph_find_frag(ci, id);
238 if (!frag)
239 goto out;
240 if (frag->split_by == 0) {
241 /* tree leaf, remove */
242 dout("fill_dirfrag removed %llx.%llx frag %x"
243 " (no ref)\n", ceph_vinop(inode), id);
244 rb_erase(&frag->node, &ci->i_fragtree);
245 kfree(frag);
246 } else {
247 /* tree branch, keep and clear */
248 dout("fill_dirfrag cleared %llx.%llx frag %x"
249 " referral\n", ceph_vinop(inode), id);
250 frag->mds = -1;
251 frag->ndist = 0;
252 }
253 goto out;
254 }
255
256
257 /* find/add this frag to store mds delegation info */
258 frag = __get_or_create_frag(ci, id);
259 if (IS_ERR(frag)) {
260 /* this is not the end of the world; we can continue
261 with bad/inaccurate delegation info */
262 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
263 ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
264 err = -ENOMEM;
265 goto out;
266 }
267
268 frag->mds = mds;
269 frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
270 for (i = 0; i < frag->ndist; i++)
271 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
272 dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
273 ceph_vinop(inode), frag->frag, frag->ndist);
274
275 out:
276 mutex_unlock(&ci->i_fragtree_mutex);
277 return err;
278 }
279
280
281 /*
282 * initialize a newly allocated inode.
283 */
284 struct inode *ceph_alloc_inode(struct super_block *sb)
285 {
286 struct ceph_inode_info *ci;
287 int i;
288
289 ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
290 if (!ci)
291 return NULL;
292
293 dout("alloc_inode %p\n", &ci->vfs_inode);
294
295 ci->i_version = 0;
296 ci->i_time_warp_seq = 0;
297 ci->i_ceph_flags = 0;
298 ci->i_release_count = 0;
299 ci->i_symlink = NULL;
300
301 ci->i_fragtree = RB_ROOT;
302 mutex_init(&ci->i_fragtree_mutex);
303
304 ci->i_xattrs.blob = NULL;
305 ci->i_xattrs.prealloc_blob = NULL;
306 ci->i_xattrs.dirty = false;
307 ci->i_xattrs.index = RB_ROOT;
308 ci->i_xattrs.count = 0;
309 ci->i_xattrs.names_size = 0;
310 ci->i_xattrs.vals_size = 0;
311 ci->i_xattrs.version = 0;
312 ci->i_xattrs.index_version = 0;
313
314 ci->i_caps = RB_ROOT;
315 ci->i_auth_cap = NULL;
316 ci->i_dirty_caps = 0;
317 ci->i_flushing_caps = 0;
318 INIT_LIST_HEAD(&ci->i_dirty_item);
319 INIT_LIST_HEAD(&ci->i_flushing_item);
320 ci->i_cap_flush_seq = 0;
321 ci->i_cap_flush_last_tid = 0;
322 memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid));
323 init_waitqueue_head(&ci->i_cap_wq);
324 ci->i_hold_caps_min = 0;
325 ci->i_hold_caps_max = 0;
326 INIT_LIST_HEAD(&ci->i_cap_delay_list);
327 ci->i_cap_exporting_mds = 0;
328 ci->i_cap_exporting_mseq = 0;
329 ci->i_cap_exporting_issued = 0;
330 INIT_LIST_HEAD(&ci->i_cap_snaps);
331 ci->i_head_snapc = NULL;
332 ci->i_snap_caps = 0;
333
334 for (i = 0; i < CEPH_FILE_MODE_NUM; i++)
335 ci->i_nr_by_mode[i] = 0;
336
337 ci->i_truncate_seq = 0;
338 ci->i_truncate_size = 0;
339 ci->i_truncate_pending = 0;
340
341 ci->i_max_size = 0;
342 ci->i_reported_size = 0;
343 ci->i_wanted_max_size = 0;
344 ci->i_requested_max_size = 0;
345
346 ci->i_pin_ref = 0;
347 ci->i_rd_ref = 0;
348 ci->i_rdcache_ref = 0;
349 ci->i_wr_ref = 0;
350 ci->i_wrbuffer_ref = 0;
351 ci->i_wrbuffer_ref_head = 0;
352 ci->i_shared_gen = 0;
353 ci->i_rdcache_gen = 0;
354 ci->i_rdcache_revoking = 0;
355
356 INIT_LIST_HEAD(&ci->i_unsafe_writes);
357 INIT_LIST_HEAD(&ci->i_unsafe_dirops);
358 spin_lock_init(&ci->i_unsafe_lock);
359
360 ci->i_snap_realm = NULL;
361 INIT_LIST_HEAD(&ci->i_snap_realm_item);
362 INIT_LIST_HEAD(&ci->i_snap_flush_item);
363
364 INIT_WORK(&ci->i_wb_work, ceph_writeback_work);
365 INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work);
366
367 INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work);
368
369 return &ci->vfs_inode;
370 }
371
372 void ceph_destroy_inode(struct inode *inode)
373 {
374 struct ceph_inode_info *ci = ceph_inode(inode);
375 struct ceph_inode_frag *frag;
376 struct rb_node *n;
377
378 dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
379
380 ceph_queue_caps_release(inode);
381
382 /*
383 * we may still have a snap_realm reference if there are stray
384 * caps in i_cap_exporting_issued or i_snap_caps.
385 */
386 if (ci->i_snap_realm) {
387 struct ceph_mds_client *mdsc =
388 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc;
389 struct ceph_snap_realm *realm = ci->i_snap_realm;
390
391 dout(" dropping residual ref to snap realm %p\n", realm);
392 spin_lock(&realm->inodes_with_caps_lock);
393 list_del_init(&ci->i_snap_realm_item);
394 spin_unlock(&realm->inodes_with_caps_lock);
395 ceph_put_snap_realm(mdsc, realm);
396 }
397
398 kfree(ci->i_symlink);
399 while ((n = rb_first(&ci->i_fragtree)) != NULL) {
400 frag = rb_entry(n, struct ceph_inode_frag, node);
401 rb_erase(n, &ci->i_fragtree);
402 kfree(frag);
403 }
404
405 __ceph_destroy_xattrs(ci);
406 if (ci->i_xattrs.blob)
407 ceph_buffer_put(ci->i_xattrs.blob);
408 if (ci->i_xattrs.prealloc_blob)
409 ceph_buffer_put(ci->i_xattrs.prealloc_blob);
410
411 kmem_cache_free(ceph_inode_cachep, ci);
412 }
413
414
415 /*
416 * Helpers to fill in size, ctime, mtime, and atime. We have to be
417 * careful because either the client or MDS may have more up to date
418 * info, depending on which capabilities are held, and whether
419 * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime
420 * and size are monotonically increasing, except when utimes() or
421 * truncate() increments the corresponding _seq values.)
422 */
423 int ceph_fill_file_size(struct inode *inode, int issued,
424 u32 truncate_seq, u64 truncate_size, u64 size)
425 {
426 struct ceph_inode_info *ci = ceph_inode(inode);
427 int queue_trunc = 0;
428
429 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
430 (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
431 dout("size %lld -> %llu\n", inode->i_size, size);
432 inode->i_size = size;
433 inode->i_blocks = (size + (1<<9) - 1) >> 9;
434 ci->i_reported_size = size;
435 if (truncate_seq != ci->i_truncate_seq) {
436 dout("truncate_seq %u -> %u\n",
437 ci->i_truncate_seq, truncate_seq);
438 ci->i_truncate_seq = truncate_seq;
439 /*
440 * If we hold relevant caps, or in the case where we're
441 * not the only client referencing this file and we
442 * don't hold those caps, then we need to check whether
443 * the file is either opened or mmaped
444 */
445 if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_RD|
446 CEPH_CAP_FILE_WR|CEPH_CAP_FILE_BUFFER|
447 CEPH_CAP_FILE_EXCL|
448 CEPH_CAP_FILE_LAZYIO)) ||
449 mapping_mapped(inode->i_mapping) ||
450 __ceph_caps_file_wanted(ci)) {
451 ci->i_truncate_pending++;
452 queue_trunc = 1;
453 }
454 }
455 }
456 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
457 ci->i_truncate_size != truncate_size) {
458 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
459 truncate_size);
460 ci->i_truncate_size = truncate_size;
461 }
462 return queue_trunc;
463 }
464
465 void ceph_fill_file_time(struct inode *inode, int issued,
466 u64 time_warp_seq, struct timespec *ctime,
467 struct timespec *mtime, struct timespec *atime)
468 {
469 struct ceph_inode_info *ci = ceph_inode(inode);
470 int warn = 0;
471
472 if (issued & (CEPH_CAP_FILE_EXCL|
473 CEPH_CAP_FILE_WR|
474 CEPH_CAP_FILE_BUFFER)) {
475 if (timespec_compare(ctime, &inode->i_ctime) > 0) {
476 dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n",
477 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
478 ctime->tv_sec, ctime->tv_nsec);
479 inode->i_ctime = *ctime;
480 }
481 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
482 /* the MDS did a utimes() */
483 dout("mtime %ld.%09ld -> %ld.%09ld "
484 "tw %d -> %d\n",
485 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
486 mtime->tv_sec, mtime->tv_nsec,
487 ci->i_time_warp_seq, (int)time_warp_seq);
488
489 inode->i_mtime = *mtime;
490 inode->i_atime = *atime;
491 ci->i_time_warp_seq = time_warp_seq;
492 } else if (time_warp_seq == ci->i_time_warp_seq) {
493 /* nobody did utimes(); take the max */
494 if (timespec_compare(mtime, &inode->i_mtime) > 0) {
495 dout("mtime %ld.%09ld -> %ld.%09ld inc\n",
496 inode->i_mtime.tv_sec,
497 inode->i_mtime.tv_nsec,
498 mtime->tv_sec, mtime->tv_nsec);
499 inode->i_mtime = *mtime;
500 }
501 if (timespec_compare(atime, &inode->i_atime) > 0) {
502 dout("atime %ld.%09ld -> %ld.%09ld inc\n",
503 inode->i_atime.tv_sec,
504 inode->i_atime.tv_nsec,
505 atime->tv_sec, atime->tv_nsec);
506 inode->i_atime = *atime;
507 }
508 } else if (issued & CEPH_CAP_FILE_EXCL) {
509 /* we did a utimes(); ignore mds values */
510 } else {
511 warn = 1;
512 }
513 } else {
514 /* we have no write caps; whatever the MDS says is true */
515 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
516 inode->i_ctime = *ctime;
517 inode->i_mtime = *mtime;
518 inode->i_atime = *atime;
519 ci->i_time_warp_seq = time_warp_seq;
520 } else {
521 warn = 1;
522 }
523 }
524 if (warn) /* time_warp_seq shouldn't go backwards */
525 dout("%p mds time_warp_seq %llu < %u\n",
526 inode, time_warp_seq, ci->i_time_warp_seq);
527 }
528
529 /*
530 * Populate an inode based on info from mds. May be called on new or
531 * existing inodes.
532 */
533 static int fill_inode(struct inode *inode,
534 struct ceph_mds_reply_info_in *iinfo,
535 struct ceph_mds_reply_dirfrag *dirinfo,
536 struct ceph_mds_session *session,
537 unsigned long ttl_from, int cap_fmode,
538 struct ceph_cap_reservation *caps_reservation)
539 {
540 struct ceph_mds_reply_inode *info = iinfo->in;
541 struct ceph_inode_info *ci = ceph_inode(inode);
542 int i;
543 int issued, implemented;
544 struct timespec mtime, atime, ctime;
545 u32 nsplits;
546 struct ceph_buffer *xattr_blob = NULL;
547 int err = 0;
548 int queue_trunc = 0;
549
550 dout("fill_inode %p ino %llx.%llx v %llu had %llu\n",
551 inode, ceph_vinop(inode), le64_to_cpu(info->version),
552 ci->i_version);
553
554 /*
555 * prealloc xattr data, if it looks like we'll need it. only
556 * if len > 4 (meaning there are actually xattrs; the first 4
557 * bytes are the xattr count).
558 */
559 if (iinfo->xattr_len > 4) {
560 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
561 if (!xattr_blob)
562 pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
563 iinfo->xattr_len);
564 }
565
566 spin_lock(&inode->i_lock);
567
568 /*
569 * provided version will be odd if inode value is projected,
570 * even if stable. skip the update if we have a newer info
571 * (e.g., due to inode info racing form multiple MDSs), or if
572 * we are getting projected (unstable) inode info.
573 */
574 if (le64_to_cpu(info->version) > 0 &&
575 (ci->i_version & ~1) > le64_to_cpu(info->version))
576 goto no_change;
577
578 issued = __ceph_caps_issued(ci, &implemented);
579 issued |= implemented | __ceph_caps_dirty(ci);
580
581 /* update inode */
582 ci->i_version = le64_to_cpu(info->version);
583 inode->i_version++;
584 inode->i_rdev = le32_to_cpu(info->rdev);
585
586 if ((issued & CEPH_CAP_AUTH_EXCL) == 0) {
587 inode->i_mode = le32_to_cpu(info->mode);
588 inode->i_uid = le32_to_cpu(info->uid);
589 inode->i_gid = le32_to_cpu(info->gid);
590 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
591 inode->i_uid, inode->i_gid);
592 }
593
594 if ((issued & CEPH_CAP_LINK_EXCL) == 0)
595 inode->i_nlink = le32_to_cpu(info->nlink);
596
597 /* be careful with mtime, atime, size */
598 ceph_decode_timespec(&atime, &info->atime);
599 ceph_decode_timespec(&mtime, &info->mtime);
600 ceph_decode_timespec(&ctime, &info->ctime);
601 queue_trunc = ceph_fill_file_size(inode, issued,
602 le32_to_cpu(info->truncate_seq),
603 le64_to_cpu(info->truncate_size),
604 le64_to_cpu(info->size));
605 ceph_fill_file_time(inode, issued,
606 le32_to_cpu(info->time_warp_seq),
607 &ctime, &mtime, &atime);
608
609 ci->i_max_size = le64_to_cpu(info->max_size);
610 ci->i_layout = info->layout;
611 inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
612
613 /* xattrs */
614 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
615 if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
616 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
617 if (ci->i_xattrs.blob)
618 ceph_buffer_put(ci->i_xattrs.blob);
619 ci->i_xattrs.blob = xattr_blob;
620 if (xattr_blob)
621 memcpy(ci->i_xattrs.blob->vec.iov_base,
622 iinfo->xattr_data, iinfo->xattr_len);
623 ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
624 xattr_blob = NULL;
625 }
626
627 inode->i_mapping->a_ops = &ceph_aops;
628 inode->i_mapping->backing_dev_info =
629 &ceph_sb_to_client(inode->i_sb)->backing_dev_info;
630
631 switch (inode->i_mode & S_IFMT) {
632 case S_IFIFO:
633 case S_IFBLK:
634 case S_IFCHR:
635 case S_IFSOCK:
636 init_special_inode(inode, inode->i_mode, inode->i_rdev);
637 inode->i_op = &ceph_file_iops;
638 break;
639 case S_IFREG:
640 inode->i_op = &ceph_file_iops;
641 inode->i_fop = &ceph_file_fops;
642 break;
643 case S_IFLNK:
644 inode->i_op = &ceph_symlink_iops;
645 if (!ci->i_symlink) {
646 int symlen = iinfo->symlink_len;
647 char *sym;
648
649 BUG_ON(symlen != inode->i_size);
650 spin_unlock(&inode->i_lock);
651
652 err = -ENOMEM;
653 sym = kmalloc(symlen+1, GFP_NOFS);
654 if (!sym)
655 goto out;
656 memcpy(sym, iinfo->symlink, symlen);
657 sym[symlen] = 0;
658
659 spin_lock(&inode->i_lock);
660 if (!ci->i_symlink)
661 ci->i_symlink = sym;
662 else
663 kfree(sym); /* lost a race */
664 }
665 break;
666 case S_IFDIR:
667 inode->i_op = &ceph_dir_iops;
668 inode->i_fop = &ceph_dir_fops;
669
670 ci->i_files = le64_to_cpu(info->files);
671 ci->i_subdirs = le64_to_cpu(info->subdirs);
672 ci->i_rbytes = le64_to_cpu(info->rbytes);
673 ci->i_rfiles = le64_to_cpu(info->rfiles);
674 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
675 ceph_decode_timespec(&ci->i_rctime, &info->rctime);
676
677 /* set dir completion flag? */
678 if (ci->i_files == 0 && ci->i_subdirs == 0 &&
679 ceph_snap(inode) == CEPH_NOSNAP &&
680 (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) &&
681 (issued & CEPH_CAP_FILE_EXCL) == 0 &&
682 (ci->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
683 dout(" marking %p complete (empty)\n", inode);
684 ci->i_ceph_flags |= CEPH_I_COMPLETE;
685 ci->i_max_offset = 2;
686 }
687
688 /* it may be better to set st_size in getattr instead? */
689 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), RBYTES))
690 inode->i_size = ci->i_rbytes;
691 break;
692 default:
693 pr_err("fill_inode %llx.%llx BAD mode 0%o\n",
694 ceph_vinop(inode), inode->i_mode);
695 }
696
697 no_change:
698 spin_unlock(&inode->i_lock);
699
700 /* queue truncate if we saw i_size decrease */
701 if (queue_trunc)
702 ceph_queue_vmtruncate(inode);
703
704 /* populate frag tree */
705 /* FIXME: move me up, if/when version reflects fragtree changes */
706 nsplits = le32_to_cpu(info->fragtree.nsplits);
707 mutex_lock(&ci->i_fragtree_mutex);
708 for (i = 0; i < nsplits; i++) {
709 u32 id = le32_to_cpu(info->fragtree.splits[i].frag);
710 struct ceph_inode_frag *frag = __get_or_create_frag(ci, id);
711
712 if (IS_ERR(frag))
713 continue;
714 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by);
715 dout(" frag %x split by %d\n", frag->frag, frag->split_by);
716 }
717 mutex_unlock(&ci->i_fragtree_mutex);
718
719 /* were we issued a capability? */
720 if (info->cap.caps) {
721 if (ceph_snap(inode) == CEPH_NOSNAP) {
722 ceph_add_cap(inode, session,
723 le64_to_cpu(info->cap.cap_id),
724 cap_fmode,
725 le32_to_cpu(info->cap.caps),
726 le32_to_cpu(info->cap.wanted),
727 le32_to_cpu(info->cap.seq),
728 le32_to_cpu(info->cap.mseq),
729 le64_to_cpu(info->cap.realm),
730 info->cap.flags,
731 caps_reservation);
732 } else {
733 spin_lock(&inode->i_lock);
734 dout(" %p got snap_caps %s\n", inode,
735 ceph_cap_string(le32_to_cpu(info->cap.caps)));
736 ci->i_snap_caps |= le32_to_cpu(info->cap.caps);
737 if (cap_fmode >= 0)
738 __ceph_get_fmode(ci, cap_fmode);
739 spin_unlock(&inode->i_lock);
740 }
741 } else if (cap_fmode >= 0) {
742 pr_warning("mds issued no caps on %llx.%llx\n",
743 ceph_vinop(inode));
744 __ceph_get_fmode(ci, cap_fmode);
745 }
746
747 /* update delegation info? */
748 if (dirinfo)
749 ceph_fill_dirfrag(inode, dirinfo);
750
751 err = 0;
752
753 out:
754 if (xattr_blob)
755 ceph_buffer_put(xattr_blob);
756 return err;
757 }
758
759 /*
760 * caller should hold session s_mutex.
761 */
762 static void update_dentry_lease(struct dentry *dentry,
763 struct ceph_mds_reply_lease *lease,
764 struct ceph_mds_session *session,
765 unsigned long from_time)
766 {
767 struct ceph_dentry_info *di = ceph_dentry(dentry);
768 long unsigned duration = le32_to_cpu(lease->duration_ms);
769 long unsigned ttl = from_time + (duration * HZ) / 1000;
770 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
771 struct inode *dir;
772
773 /* only track leases on regular dentries */
774 if (dentry->d_op != &ceph_dentry_ops)
775 return;
776
777 spin_lock(&dentry->d_lock);
778 dout("update_dentry_lease %p mask %d duration %lu ms ttl %lu\n",
779 dentry, le16_to_cpu(lease->mask), duration, ttl);
780
781 /* make lease_rdcache_gen match directory */
782 dir = dentry->d_parent->d_inode;
783 di->lease_shared_gen = ceph_inode(dir)->i_shared_gen;
784
785 if (lease->mask == 0)
786 goto out_unlock;
787
788 if (di->lease_gen == session->s_cap_gen &&
789 time_before(ttl, dentry->d_time))
790 goto out_unlock; /* we already have a newer lease. */
791
792 if (di->lease_session && di->lease_session != session)
793 goto out_unlock;
794
795 ceph_dentry_lru_touch(dentry);
796
797 if (!di->lease_session)
798 di->lease_session = ceph_get_mds_session(session);
799 di->lease_gen = session->s_cap_gen;
800 di->lease_seq = le32_to_cpu(lease->seq);
801 di->lease_renew_after = half_ttl;
802 di->lease_renew_from = 0;
803 dentry->d_time = ttl;
804 out_unlock:
805 spin_unlock(&dentry->d_lock);
806 return;
807 }
808
809 /*
810 * Set dentry's directory position based on the current dir's max, and
811 * order it in d_subdirs, so that dcache_readdir behaves.
812 */
813 static void ceph_set_dentry_offset(struct dentry *dn)
814 {
815 struct dentry *dir = dn->d_parent;
816 struct inode *inode = dn->d_parent->d_inode;
817 struct ceph_dentry_info *di;
818
819 BUG_ON(!inode);
820
821 di = ceph_dentry(dn);
822
823 spin_lock(&inode->i_lock);
824 if ((ceph_inode(inode)->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
825 spin_unlock(&inode->i_lock);
826 return;
827 }
828 di->offset = ceph_inode(inode)->i_max_offset++;
829 spin_unlock(&inode->i_lock);
830
831 spin_lock(&dcache_lock);
832 spin_lock(&dn->d_lock);
833 list_move(&dn->d_u.d_child, &dir->d_subdirs);
834 dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
835 dn->d_u.d_child.prev, dn->d_u.d_child.next);
836 spin_unlock(&dn->d_lock);
837 spin_unlock(&dcache_lock);
838 }
839
840 /*
841 * splice a dentry to an inode.
842 * caller must hold directory i_mutex for this to be safe.
843 *
844 * we will only rehash the resulting dentry if @prehash is
845 * true; @prehash will be set to false (for the benefit of
846 * the caller) if we fail.
847 */
848 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
849 bool *prehash, bool set_offset)
850 {
851 struct dentry *realdn;
852
853 BUG_ON(dn->d_inode);
854
855 /* dn must be unhashed */
856 if (!d_unhashed(dn))
857 d_drop(dn);
858 realdn = d_materialise_unique(dn, in);
859 if (IS_ERR(realdn)) {
860 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
861 PTR_ERR(realdn), dn, in, ceph_vinop(in));
862 if (prehash)
863 *prehash = false; /* don't rehash on error */
864 dn = realdn; /* note realdn contains the error */
865 goto out;
866 } else if (realdn) {
867 dout("dn %p (%d) spliced with %p (%d) "
868 "inode %p ino %llx.%llx\n",
869 dn, atomic_read(&dn->d_count),
870 realdn, atomic_read(&realdn->d_count),
871 realdn->d_inode, ceph_vinop(realdn->d_inode));
872 dput(dn);
873 dn = realdn;
874 } else {
875 BUG_ON(!ceph_dentry(dn));
876 dout("dn %p attached to %p ino %llx.%llx\n",
877 dn, dn->d_inode, ceph_vinop(dn->d_inode));
878 }
879 if ((!prehash || *prehash) && d_unhashed(dn))
880 d_rehash(dn);
881 if (set_offset)
882 ceph_set_dentry_offset(dn);
883 out:
884 return dn;
885 }
886
887 /*
888 * Incorporate results into the local cache. This is either just
889 * one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
890 * after a lookup).
891 *
892 * A reply may contain
893 * a directory inode along with a dentry.
894 * and/or a target inode
895 *
896 * Called with snap_rwsem (read).
897 */
898 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
899 struct ceph_mds_session *session)
900 {
901 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
902 struct inode *in = NULL;
903 struct ceph_mds_reply_inode *ininfo;
904 struct ceph_vino vino;
905 struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
906 int i = 0;
907 int err = 0;
908
909 dout("fill_trace %p is_dentry %d is_target %d\n", req,
910 rinfo->head->is_dentry, rinfo->head->is_target);
911
912 #if 0
913 /*
914 * Debugging hook:
915 *
916 * If we resend completed ops to a recovering mds, we get no
917 * trace. Since that is very rare, pretend this is the case
918 * to ensure the 'no trace' handlers in the callers behave.
919 *
920 * Fill in inodes unconditionally to avoid breaking cap
921 * invariants.
922 */
923 if (rinfo->head->op & CEPH_MDS_OP_WRITE) {
924 pr_info("fill_trace faking empty trace on %lld %s\n",
925 req->r_tid, ceph_mds_op_name(rinfo->head->op));
926 if (rinfo->head->is_dentry) {
927 rinfo->head->is_dentry = 0;
928 err = fill_inode(req->r_locked_dir,
929 &rinfo->diri, rinfo->dirfrag,
930 session, req->r_request_started, -1);
931 }
932 if (rinfo->head->is_target) {
933 rinfo->head->is_target = 0;
934 ininfo = rinfo->targeti.in;
935 vino.ino = le64_to_cpu(ininfo->ino);
936 vino.snap = le64_to_cpu(ininfo->snapid);
937 in = ceph_get_inode(sb, vino);
938 err = fill_inode(in, &rinfo->targeti, NULL,
939 session, req->r_request_started,
940 req->r_fmode);
941 iput(in);
942 }
943 }
944 #endif
945
946 if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
947 dout("fill_trace reply is empty!\n");
948 if (rinfo->head->result == 0 && req->r_locked_dir)
949 ceph_invalidate_dir_request(req);
950 return 0;
951 }
952
953 if (rinfo->head->is_dentry) {
954 struct inode *dir = req->r_locked_dir;
955
956 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag,
957 session, req->r_request_started, -1,
958 &req->r_caps_reservation);
959 if (err < 0)
960 return err;
961 }
962
963 /*
964 * ignore null lease/binding on snapdir ENOENT, or else we
965 * will have trouble splicing in the virtual snapdir later
966 */
967 if (rinfo->head->is_dentry && !req->r_aborted &&
968 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
969 fsc->mount_options->snapdir_name,
970 req->r_dentry->d_name.len))) {
971 /*
972 * lookup link rename : null -> possibly existing inode
973 * mknod symlink mkdir : null -> new inode
974 * unlink : linked -> null
975 */
976 struct inode *dir = req->r_locked_dir;
977 struct dentry *dn = req->r_dentry;
978 bool have_dir_cap, have_lease;
979
980 BUG_ON(!dn);
981 BUG_ON(!dir);
982 BUG_ON(dn->d_parent->d_inode != dir);
983 BUG_ON(ceph_ino(dir) !=
984 le64_to_cpu(rinfo->diri.in->ino));
985 BUG_ON(ceph_snap(dir) !=
986 le64_to_cpu(rinfo->diri.in->snapid));
987
988 /* do we have a lease on the whole dir? */
989 have_dir_cap =
990 (le32_to_cpu(rinfo->diri.in->cap.caps) &
991 CEPH_CAP_FILE_SHARED);
992
993 /* do we have a dn lease? */
994 have_lease = have_dir_cap ||
995 (le16_to_cpu(rinfo->dlease->mask) &
996 CEPH_LOCK_DN);
997
998 if (!have_lease)
999 dout("fill_trace no dentry lease or dir cap\n");
1000
1001 /* rename? */
1002 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
1003 dout(" src %p '%.*s' dst %p '%.*s'\n",
1004 req->r_old_dentry,
1005 req->r_old_dentry->d_name.len,
1006 req->r_old_dentry->d_name.name,
1007 dn, dn->d_name.len, dn->d_name.name);
1008 dout("fill_trace doing d_move %p -> %p\n",
1009 req->r_old_dentry, dn);
1010
1011 /* d_move screws up d_subdirs order */
1012 ceph_i_clear(dir, CEPH_I_COMPLETE);
1013
1014 d_move(req->r_old_dentry, dn);
1015 dout(" src %p '%.*s' dst %p '%.*s'\n",
1016 req->r_old_dentry,
1017 req->r_old_dentry->d_name.len,
1018 req->r_old_dentry->d_name.name,
1019 dn, dn->d_name.len, dn->d_name.name);
1020
1021 /* ensure target dentry is invalidated, despite
1022 rehashing bug in vfs_rename_dir */
1023 ceph_invalidate_dentry_lease(dn);
1024
1025 /* take overwritten dentry's readdir offset */
1026 dout("dn %p gets %p offset %lld (old offset %lld)\n",
1027 req->r_old_dentry, dn, ceph_dentry(dn)->offset,
1028 ceph_dentry(req->r_old_dentry)->offset);
1029 ceph_dentry(req->r_old_dentry)->offset =
1030 ceph_dentry(dn)->offset;
1031
1032 dn = req->r_old_dentry; /* use old_dentry */
1033 in = dn->d_inode;
1034 }
1035
1036 /* null dentry? */
1037 if (!rinfo->head->is_target) {
1038 dout("fill_trace null dentry\n");
1039 if (dn->d_inode) {
1040 dout("d_delete %p\n", dn);
1041 d_delete(dn);
1042 } else {
1043 dout("d_instantiate %p NULL\n", dn);
1044 d_instantiate(dn, NULL);
1045 if (have_lease && d_unhashed(dn))
1046 d_rehash(dn);
1047 update_dentry_lease(dn, rinfo->dlease,
1048 session,
1049 req->r_request_started);
1050 }
1051 goto done;
1052 }
1053
1054 /* attach proper inode */
1055 ininfo = rinfo->targeti.in;
1056 vino.ino = le64_to_cpu(ininfo->ino);
1057 vino.snap = le64_to_cpu(ininfo->snapid);
1058 if (!dn->d_inode) {
1059 in = ceph_get_inode(sb, vino);
1060 if (IS_ERR(in)) {
1061 pr_err("fill_trace bad get_inode "
1062 "%llx.%llx\n", vino.ino, vino.snap);
1063 err = PTR_ERR(in);
1064 d_delete(dn);
1065 goto done;
1066 }
1067 dn = splice_dentry(dn, in, &have_lease, true);
1068 if (IS_ERR(dn)) {
1069 err = PTR_ERR(dn);
1070 goto done;
1071 }
1072 req->r_dentry = dn; /* may have spliced */
1073 igrab(in);
1074 } else if (ceph_ino(in) == vino.ino &&
1075 ceph_snap(in) == vino.snap) {
1076 igrab(in);
1077 } else {
1078 dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
1079 dn, in, ceph_ino(in), ceph_snap(in),
1080 vino.ino, vino.snap);
1081 have_lease = false;
1082 in = NULL;
1083 }
1084
1085 if (have_lease)
1086 update_dentry_lease(dn, rinfo->dlease, session,
1087 req->r_request_started);
1088 dout(" final dn %p\n", dn);
1089 i++;
1090 } else if (req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
1091 req->r_op == CEPH_MDS_OP_MKSNAP) {
1092 struct dentry *dn = req->r_dentry;
1093
1094 /* fill out a snapdir LOOKUPSNAP dentry */
1095 BUG_ON(!dn);
1096 BUG_ON(!req->r_locked_dir);
1097 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR);
1098 ininfo = rinfo->targeti.in;
1099 vino.ino = le64_to_cpu(ininfo->ino);
1100 vino.snap = le64_to_cpu(ininfo->snapid);
1101 in = ceph_get_inode(sb, vino);
1102 if (IS_ERR(in)) {
1103 pr_err("fill_inode get_inode badness %llx.%llx\n",
1104 vino.ino, vino.snap);
1105 err = PTR_ERR(in);
1106 d_delete(dn);
1107 goto done;
1108 }
1109 dout(" linking snapped dir %p to dn %p\n", in, dn);
1110 dn = splice_dentry(dn, in, NULL, true);
1111 if (IS_ERR(dn)) {
1112 err = PTR_ERR(dn);
1113 goto done;
1114 }
1115 req->r_dentry = dn; /* may have spliced */
1116 igrab(in);
1117 rinfo->head->is_dentry = 1; /* fool notrace handlers */
1118 }
1119
1120 if (rinfo->head->is_target) {
1121 vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
1122 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
1123
1124 if (in == NULL || ceph_ino(in) != vino.ino ||
1125 ceph_snap(in) != vino.snap) {
1126 in = ceph_get_inode(sb, vino);
1127 if (IS_ERR(in)) {
1128 err = PTR_ERR(in);
1129 goto done;
1130 }
1131 }
1132 req->r_target_inode = in;
1133
1134 err = fill_inode(in,
1135 &rinfo->targeti, NULL,
1136 session, req->r_request_started,
1137 (le32_to_cpu(rinfo->head->result) == 0) ?
1138 req->r_fmode : -1,
1139 &req->r_caps_reservation);
1140 if (err < 0) {
1141 pr_err("fill_inode badness %p %llx.%llx\n",
1142 in, ceph_vinop(in));
1143 goto done;
1144 }
1145 }
1146
1147 done:
1148 dout("fill_trace done err=%d\n", err);
1149 return err;
1150 }
1151
1152 /*
1153 * Prepopulate our cache with readdir results, leases, etc.
1154 */
1155 int ceph_readdir_prepopulate(struct ceph_mds_request *req,
1156 struct ceph_mds_session *session)
1157 {
1158 struct dentry *parent = req->r_dentry;
1159 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1160 struct qstr dname;
1161 struct dentry *dn;
1162 struct inode *in;
1163 int err = 0, i;
1164 struct inode *snapdir = NULL;
1165 struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
1166 u64 frag = le32_to_cpu(rhead->args.readdir.frag);
1167 struct ceph_dentry_info *di;
1168
1169 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
1170 snapdir = ceph_get_snapdir(parent->d_inode);
1171 parent = d_find_alias(snapdir);
1172 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
1173 rinfo->dir_nr, parent);
1174 } else {
1175 dout("readdir_prepopulate %d items under dn %p\n",
1176 rinfo->dir_nr, parent);
1177 if (rinfo->dir_dir)
1178 ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
1179 }
1180
1181 for (i = 0; i < rinfo->dir_nr; i++) {
1182 struct ceph_vino vino;
1183
1184 dname.name = rinfo->dir_dname[i];
1185 dname.len = rinfo->dir_dname_len[i];
1186 dname.hash = full_name_hash(dname.name, dname.len);
1187
1188 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino);
1189 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid);
1190
1191 retry_lookup:
1192 dn = d_lookup(parent, &dname);
1193 dout("d_lookup on parent=%p name=%.*s got %p\n",
1194 parent, dname.len, dname.name, dn);
1195
1196 if (!dn) {
1197 dn = d_alloc(parent, &dname);
1198 dout("d_alloc %p '%.*s' = %p\n", parent,
1199 dname.len, dname.name, dn);
1200 if (dn == NULL) {
1201 dout("d_alloc badness\n");
1202 err = -ENOMEM;
1203 goto out;
1204 }
1205 err = ceph_init_dentry(dn);
1206 if (err < 0) {
1207 dput(dn);
1208 goto out;
1209 }
1210 } else if (dn->d_inode &&
1211 (ceph_ino(dn->d_inode) != vino.ino ||
1212 ceph_snap(dn->d_inode) != vino.snap)) {
1213 dout(" dn %p points to wrong inode %p\n",
1214 dn, dn->d_inode);
1215 d_delete(dn);
1216 dput(dn);
1217 goto retry_lookup;
1218 } else {
1219 /* reorder parent's d_subdirs */
1220 spin_lock(&dcache_lock);
1221 spin_lock(&dn->d_lock);
1222 list_move(&dn->d_u.d_child, &parent->d_subdirs);
1223 spin_unlock(&dn->d_lock);
1224 spin_unlock(&dcache_lock);
1225 }
1226
1227 di = dn->d_fsdata;
1228 di->offset = ceph_make_fpos(frag, i + req->r_readdir_offset);
1229
1230 /* inode */
1231 if (dn->d_inode) {
1232 in = dn->d_inode;
1233 } else {
1234 in = ceph_get_inode(parent->d_sb, vino);
1235 if (IS_ERR(in)) {
1236 dout("new_inode badness\n");
1237 d_delete(dn);
1238 dput(dn);
1239 err = PTR_ERR(in);
1240 goto out;
1241 }
1242 dn = splice_dentry(dn, in, NULL, false);
1243 if (IS_ERR(dn))
1244 dn = NULL;
1245 }
1246
1247 if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
1248 req->r_request_started, -1,
1249 &req->r_caps_reservation) < 0) {
1250 pr_err("fill_inode badness on %p\n", in);
1251 goto next_item;
1252 }
1253 if (dn)
1254 update_dentry_lease(dn, rinfo->dir_dlease[i],
1255 req->r_session,
1256 req->r_request_started);
1257 next_item:
1258 if (dn)
1259 dput(dn);
1260 }
1261 req->r_did_prepopulate = true;
1262
1263 out:
1264 if (snapdir) {
1265 iput(snapdir);
1266 dput(parent);
1267 }
1268 dout("readdir_prepopulate done\n");
1269 return err;
1270 }
1271
1272 int ceph_inode_set_size(struct inode *inode, loff_t size)
1273 {
1274 struct ceph_inode_info *ci = ceph_inode(inode);
1275 int ret = 0;
1276
1277 spin_lock(&inode->i_lock);
1278 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
1279 inode->i_size = size;
1280 inode->i_blocks = (size + (1 << 9) - 1) >> 9;
1281
1282 /* tell the MDS if we are approaching max_size */
1283 if ((size << 1) >= ci->i_max_size &&
1284 (ci->i_reported_size << 1) < ci->i_max_size)
1285 ret = 1;
1286
1287 spin_unlock(&inode->i_lock);
1288 return ret;
1289 }
1290
1291 /*
1292 * Write back inode data in a worker thread. (This can't be done
1293 * in the message handler context.)
1294 */
1295 void ceph_queue_writeback(struct inode *inode)
1296 {
1297 if (queue_work(ceph_inode_to_client(inode)->wb_wq,
1298 &ceph_inode(inode)->i_wb_work)) {
1299 dout("ceph_queue_writeback %p\n", inode);
1300 igrab(inode);
1301 } else {
1302 dout("ceph_queue_writeback %p failed\n", inode);
1303 }
1304 }
1305
1306 static void ceph_writeback_work(struct work_struct *work)
1307 {
1308 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1309 i_wb_work);
1310 struct inode *inode = &ci->vfs_inode;
1311
1312 dout("writeback %p\n", inode);
1313 filemap_fdatawrite(&inode->i_data);
1314 iput(inode);
1315 }
1316
1317 /*
1318 * queue an async invalidation
1319 */
1320 void ceph_queue_invalidate(struct inode *inode)
1321 {
1322 if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq,
1323 &ceph_inode(inode)->i_pg_inv_work)) {
1324 dout("ceph_queue_invalidate %p\n", inode);
1325 igrab(inode);
1326 } else {
1327 dout("ceph_queue_invalidate %p failed\n", inode);
1328 }
1329 }
1330
1331 /*
1332 * invalidate any pages that are not dirty or under writeback. this
1333 * includes pages that are clean and mapped.
1334 */
1335 static void ceph_invalidate_nondirty_pages(struct address_space *mapping)
1336 {
1337 struct pagevec pvec;
1338 pgoff_t next = 0;
1339 int i;
1340
1341 pagevec_init(&pvec, 0);
1342 while (pagevec_lookup(&pvec, mapping, next, PAGEVEC_SIZE)) {
1343 for (i = 0; i < pagevec_count(&pvec); i++) {
1344 struct page *page = pvec.pages[i];
1345 pgoff_t index;
1346 int skip_page =
1347 (PageDirty(page) || PageWriteback(page));
1348
1349 if (!skip_page)
1350 skip_page = !trylock_page(page);
1351
1352 /*
1353 * We really shouldn't be looking at the ->index of an
1354 * unlocked page. But we're not allowed to lock these
1355 * pages. So we rely upon nobody altering the ->index
1356 * of this (pinned-by-us) page.
1357 */
1358 index = page->index;
1359 if (index > next)
1360 next = index;
1361 next++;
1362
1363 if (skip_page)
1364 continue;
1365
1366 generic_error_remove_page(mapping, page);
1367 unlock_page(page);
1368 }
1369 pagevec_release(&pvec);
1370 cond_resched();
1371 }
1372 }
1373
1374 /*
1375 * Invalidate inode pages in a worker thread. (This can't be done
1376 * in the message handler context.)
1377 */
1378 static void ceph_invalidate_work(struct work_struct *work)
1379 {
1380 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1381 i_pg_inv_work);
1382 struct inode *inode = &ci->vfs_inode;
1383 u32 orig_gen;
1384 int check = 0;
1385
1386 spin_lock(&inode->i_lock);
1387 dout("invalidate_pages %p gen %d revoking %d\n", inode,
1388 ci->i_rdcache_gen, ci->i_rdcache_revoking);
1389 if (ci->i_rdcache_gen == 0 ||
1390 ci->i_rdcache_revoking != ci->i_rdcache_gen) {
1391 BUG_ON(ci->i_rdcache_revoking > ci->i_rdcache_gen);
1392 /* nevermind! */
1393 ci->i_rdcache_revoking = 0;
1394 spin_unlock(&inode->i_lock);
1395 goto out;
1396 }
1397 orig_gen = ci->i_rdcache_gen;
1398 spin_unlock(&inode->i_lock);
1399
1400 ceph_invalidate_nondirty_pages(inode->i_mapping);
1401
1402 spin_lock(&inode->i_lock);
1403 if (orig_gen == ci->i_rdcache_gen) {
1404 dout("invalidate_pages %p gen %d successful\n", inode,
1405 ci->i_rdcache_gen);
1406 ci->i_rdcache_gen = 0;
1407 ci->i_rdcache_revoking = 0;
1408 check = 1;
1409 } else {
1410 dout("invalidate_pages %p gen %d raced, gen now %d\n",
1411 inode, orig_gen, ci->i_rdcache_gen);
1412 }
1413 spin_unlock(&inode->i_lock);
1414
1415 if (check)
1416 ceph_check_caps(ci, 0, NULL);
1417 out:
1418 iput(inode);
1419 }
1420
1421
1422 /*
1423 * called by trunc_wq; take i_mutex ourselves
1424 *
1425 * We also truncate in a separate thread as well.
1426 */
1427 static void ceph_vmtruncate_work(struct work_struct *work)
1428 {
1429 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
1430 i_vmtruncate_work);
1431 struct inode *inode = &ci->vfs_inode;
1432
1433 dout("vmtruncate_work %p\n", inode);
1434 mutex_lock(&inode->i_mutex);
1435 __ceph_do_pending_vmtruncate(inode);
1436 mutex_unlock(&inode->i_mutex);
1437 iput(inode);
1438 }
1439
1440 /*
1441 * Queue an async vmtruncate. If we fail to queue work, we will handle
1442 * the truncation the next time we call __ceph_do_pending_vmtruncate.
1443 */
1444 void ceph_queue_vmtruncate(struct inode *inode)
1445 {
1446 struct ceph_inode_info *ci = ceph_inode(inode);
1447
1448 if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq,
1449 &ci->i_vmtruncate_work)) {
1450 dout("ceph_queue_vmtruncate %p\n", inode);
1451 igrab(inode);
1452 } else {
1453 dout("ceph_queue_vmtruncate %p failed, pending=%d\n",
1454 inode, ci->i_truncate_pending);
1455 }
1456 }
1457
1458 /*
1459 * called with i_mutex held.
1460 *
1461 * Make sure any pending truncation is applied before doing anything
1462 * that may depend on it.
1463 */
1464 void __ceph_do_pending_vmtruncate(struct inode *inode)
1465 {
1466 struct ceph_inode_info *ci = ceph_inode(inode);
1467 u64 to;
1468 int wrbuffer_refs, wake = 0;
1469
1470 retry:
1471 spin_lock(&inode->i_lock);
1472 if (ci->i_truncate_pending == 0) {
1473 dout("__do_pending_vmtruncate %p none pending\n", inode);
1474 spin_unlock(&inode->i_lock);
1475 return;
1476 }
1477
1478 /*
1479 * make sure any dirty snapped pages are flushed before we
1480 * possibly truncate them.. so write AND block!
1481 */
1482 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
1483 dout("__do_pending_vmtruncate %p flushing snaps first\n",
1484 inode);
1485 spin_unlock(&inode->i_lock);
1486 filemap_write_and_wait_range(&inode->i_data, 0,
1487 inode->i_sb->s_maxbytes);
1488 goto retry;
1489 }
1490
1491 to = ci->i_truncate_size;
1492 wrbuffer_refs = ci->i_wrbuffer_ref;
1493 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
1494 ci->i_truncate_pending, to);
1495 spin_unlock(&inode->i_lock);
1496
1497 truncate_inode_pages(inode->i_mapping, to);
1498
1499 spin_lock(&inode->i_lock);
1500 ci->i_truncate_pending--;
1501 if (ci->i_truncate_pending == 0)
1502 wake = 1;
1503 spin_unlock(&inode->i_lock);
1504
1505 if (wrbuffer_refs == 0)
1506 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL);
1507 if (wake)
1508 wake_up_all(&ci->i_cap_wq);
1509 }
1510
1511
1512 /*
1513 * symlinks
1514 */
1515 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd)
1516 {
1517 struct ceph_inode_info *ci = ceph_inode(dentry->d_inode);
1518 nd_set_link(nd, ci->i_symlink);
1519 return NULL;
1520 }
1521
1522 static const struct inode_operations ceph_symlink_iops = {
1523 .readlink = generic_readlink,
1524 .follow_link = ceph_sym_follow_link,
1525 };
1526
1527 /*
1528 * setattr
1529 */
1530 int ceph_setattr(struct dentry *dentry, struct iattr *attr)
1531 {
1532 struct inode *inode = dentry->d_inode;
1533 struct ceph_inode_info *ci = ceph_inode(inode);
1534 struct inode *parent_inode = dentry->d_parent->d_inode;
1535 const unsigned int ia_valid = attr->ia_valid;
1536 struct ceph_mds_request *req;
1537 struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
1538 int issued;
1539 int release = 0, dirtied = 0;
1540 int mask = 0;
1541 int err = 0;
1542
1543 if (ceph_snap(inode) != CEPH_NOSNAP)
1544 return -EROFS;
1545
1546 __ceph_do_pending_vmtruncate(inode);
1547
1548 err = inode_change_ok(inode, attr);
1549 if (err != 0)
1550 return err;
1551
1552 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
1553 USE_AUTH_MDS);
1554 if (IS_ERR(req))
1555 return PTR_ERR(req);
1556
1557 spin_lock(&inode->i_lock);
1558 issued = __ceph_caps_issued(ci, NULL);
1559 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
1560
1561 if (ia_valid & ATTR_UID) {
1562 dout("setattr %p uid %d -> %d\n", inode,
1563 inode->i_uid, attr->ia_uid);
1564 if (issued & CEPH_CAP_AUTH_EXCL) {
1565 inode->i_uid = attr->ia_uid;
1566 dirtied |= CEPH_CAP_AUTH_EXCL;
1567 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1568 attr->ia_uid != inode->i_uid) {
1569 req->r_args.setattr.uid = cpu_to_le32(attr->ia_uid);
1570 mask |= CEPH_SETATTR_UID;
1571 release |= CEPH_CAP_AUTH_SHARED;
1572 }
1573 }
1574 if (ia_valid & ATTR_GID) {
1575 dout("setattr %p gid %d -> %d\n", inode,
1576 inode->i_gid, attr->ia_gid);
1577 if (issued & CEPH_CAP_AUTH_EXCL) {
1578 inode->i_gid = attr->ia_gid;
1579 dirtied |= CEPH_CAP_AUTH_EXCL;
1580 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1581 attr->ia_gid != inode->i_gid) {
1582 req->r_args.setattr.gid = cpu_to_le32(attr->ia_gid);
1583 mask |= CEPH_SETATTR_GID;
1584 release |= CEPH_CAP_AUTH_SHARED;
1585 }
1586 }
1587 if (ia_valid & ATTR_MODE) {
1588 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
1589 attr->ia_mode);
1590 if (issued & CEPH_CAP_AUTH_EXCL) {
1591 inode->i_mode = attr->ia_mode;
1592 dirtied |= CEPH_CAP_AUTH_EXCL;
1593 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
1594 attr->ia_mode != inode->i_mode) {
1595 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
1596 mask |= CEPH_SETATTR_MODE;
1597 release |= CEPH_CAP_AUTH_SHARED;
1598 }
1599 }
1600
1601 if (ia_valid & ATTR_ATIME) {
1602 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode,
1603 inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
1604 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
1605 if (issued & CEPH_CAP_FILE_EXCL) {
1606 ci->i_time_warp_seq++;
1607 inode->i_atime = attr->ia_atime;
1608 dirtied |= CEPH_CAP_FILE_EXCL;
1609 } else if ((issued & CEPH_CAP_FILE_WR) &&
1610 timespec_compare(&inode->i_atime,
1611 &attr->ia_atime) < 0) {
1612 inode->i_atime = attr->ia_atime;
1613 dirtied |= CEPH_CAP_FILE_WR;
1614 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1615 !timespec_equal(&inode->i_atime, &attr->ia_atime)) {
1616 ceph_encode_timespec(&req->r_args.setattr.atime,
1617 &attr->ia_atime);
1618 mask |= CEPH_SETATTR_ATIME;
1619 release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD |
1620 CEPH_CAP_FILE_WR;
1621 }
1622 }
1623 if (ia_valid & ATTR_MTIME) {
1624 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode,
1625 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
1626 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
1627 if (issued & CEPH_CAP_FILE_EXCL) {
1628 ci->i_time_warp_seq++;
1629 inode->i_mtime = attr->ia_mtime;
1630 dirtied |= CEPH_CAP_FILE_EXCL;
1631 } else if ((issued & CEPH_CAP_FILE_WR) &&
1632 timespec_compare(&inode->i_mtime,
1633 &attr->ia_mtime) < 0) {
1634 inode->i_mtime = attr->ia_mtime;
1635 dirtied |= CEPH_CAP_FILE_WR;
1636 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1637 !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) {
1638 ceph_encode_timespec(&req->r_args.setattr.mtime,
1639 &attr->ia_mtime);
1640 mask |= CEPH_SETATTR_MTIME;
1641 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1642 CEPH_CAP_FILE_WR;
1643 }
1644 }
1645 if (ia_valid & ATTR_SIZE) {
1646 dout("setattr %p size %lld -> %lld\n", inode,
1647 inode->i_size, attr->ia_size);
1648 if (attr->ia_size > inode->i_sb->s_maxbytes) {
1649 err = -EINVAL;
1650 goto out;
1651 }
1652 if ((issued & CEPH_CAP_FILE_EXCL) &&
1653 attr->ia_size > inode->i_size) {
1654 inode->i_size = attr->ia_size;
1655 inode->i_blocks =
1656 (attr->ia_size + (1 << 9) - 1) >> 9;
1657 inode->i_ctime = attr->ia_ctime;
1658 ci->i_reported_size = attr->ia_size;
1659 dirtied |= CEPH_CAP_FILE_EXCL;
1660 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
1661 attr->ia_size != inode->i_size) {
1662 req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
1663 req->r_args.setattr.old_size =
1664 cpu_to_le64(inode->i_size);
1665 mask |= CEPH_SETATTR_SIZE;
1666 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD |
1667 CEPH_CAP_FILE_WR;
1668 }
1669 }
1670
1671 /* these do nothing */
1672 if (ia_valid & ATTR_CTIME) {
1673 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
1674 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
1675 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode,
1676 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
1677 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
1678 only ? "ctime only" : "ignored");
1679 inode->i_ctime = attr->ia_ctime;
1680 if (only) {
1681 /*
1682 * if kernel wants to dirty ctime but nothing else,
1683 * we need to choose a cap to dirty under, or do
1684 * a almost-no-op setattr
1685 */
1686 if (issued & CEPH_CAP_AUTH_EXCL)
1687 dirtied |= CEPH_CAP_AUTH_EXCL;
1688 else if (issued & CEPH_CAP_FILE_EXCL)
1689 dirtied |= CEPH_CAP_FILE_EXCL;
1690 else if (issued & CEPH_CAP_XATTR_EXCL)
1691 dirtied |= CEPH_CAP_XATTR_EXCL;
1692 else
1693 mask |= CEPH_SETATTR_CTIME;
1694 }
1695 }
1696 if (ia_valid & ATTR_FILE)
1697 dout("setattr %p ATTR_FILE ... hrm!\n", inode);
1698
1699 if (dirtied) {
1700 __ceph_mark_dirty_caps(ci, dirtied);
1701 inode->i_ctime = CURRENT_TIME;
1702 }
1703
1704 release &= issued;
1705 spin_unlock(&inode->i_lock);
1706
1707 if (mask) {
1708 req->r_inode = igrab(inode);
1709 req->r_inode_drop = release;
1710 req->r_args.setattr.mask = cpu_to_le32(mask);
1711 req->r_num_caps = 1;
1712 err = ceph_mdsc_do_request(mdsc, parent_inode, req);
1713 }
1714 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
1715 ceph_cap_string(dirtied), mask);
1716
1717 ceph_mdsc_put_request(req);
1718 __ceph_do_pending_vmtruncate(inode);
1719 return err;
1720 out:
1721 spin_unlock(&inode->i_lock);
1722 ceph_mdsc_put_request(req);
1723 return err;
1724 }
1725
1726 /*
1727 * Verify that we have a lease on the given mask. If not,
1728 * do a getattr against an mds.
1729 */
1730 int ceph_do_getattr(struct inode *inode, int mask)
1731 {
1732 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
1733 struct ceph_mds_client *mdsc = fsc->mdsc;
1734 struct ceph_mds_request *req;
1735 int err;
1736
1737 if (ceph_snap(inode) == CEPH_SNAPDIR) {
1738 dout("do_getattr inode %p SNAPDIR\n", inode);
1739 return 0;
1740 }
1741
1742 dout("do_getattr inode %p mask %s\n", inode, ceph_cap_string(mask));
1743 if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
1744 return 0;
1745
1746 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
1747 if (IS_ERR(req))
1748 return PTR_ERR(req);
1749 req->r_inode = igrab(inode);
1750 req->r_num_caps = 1;
1751 req->r_args.getattr.mask = cpu_to_le32(mask);
1752 err = ceph_mdsc_do_request(mdsc, NULL, req);
1753 ceph_mdsc_put_request(req);
1754 dout("do_getattr result=%d\n", err);
1755 return err;
1756 }
1757
1758
1759 /*
1760 * Check inode permissions. We verify we have a valid value for
1761 * the AUTH cap, then call the generic handler.
1762 */
1763 int ceph_permission(struct inode *inode, int mask)
1764 {
1765 int err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
1766
1767 if (!err)
1768 err = generic_permission(inode, mask, NULL);
1769 return err;
1770 }
1771
1772 /*
1773 * Get all attributes. Hopefully somedata we'll have a statlite()
1774 * and can limit the fields we require to be accurate.
1775 */
1776 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
1777 struct kstat *stat)
1778 {
1779 struct inode *inode = dentry->d_inode;
1780 struct ceph_inode_info *ci = ceph_inode(inode);
1781 int err;
1782
1783 err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
1784 if (!err) {
1785 generic_fillattr(inode, stat);
1786 stat->ino = inode->i_ino;
1787 if (ceph_snap(inode) != CEPH_NOSNAP)
1788 stat->dev = ceph_snap(inode);
1789 else
1790 stat->dev = 0;
1791 if (S_ISDIR(inode->i_mode)) {
1792 stat->size = ci->i_rbytes;
1793 stat->blocks = 0;
1794 stat->blksize = 65536;
1795 }
1796 }
1797 return err;
1798 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree