Commit | Line | Data |
---|---|---|
2817b000 SW |
1 | #include "ceph_debug.h" |
2 | ||
3 | #include <linux/spinlock.h> | |
4 | #include <linux/fs_struct.h> | |
5 | #include <linux/namei.h> | |
6 | #include <linux/sched.h> | |
7 | ||
8 | #include "super.h" | |
9 | ||
10 | /* | |
11 | * Directory operations: readdir, lookup, create, link, unlink, | |
12 | * rename, etc. | |
13 | */ | |
14 | ||
15 | /* | |
16 | * Ceph MDS operations are specified in terms of a base ino and | |
17 | * relative path. Thus, the client can specify an operation on a | |
18 | * specific inode (e.g., a getattr due to fstat(2)), or as a path | |
19 | * relative to, say, the root directory. | |
20 | * | |
21 | * Normally, we limit ourselves to strict inode ops (no path component) | |
22 | * or dentry operations (a single path component relative to an ino). The | |
23 | * exception to this is open_root_dentry(), which will open the mount | |
24 | * point by name. | |
25 | */ | |
26 | ||
27 | const struct inode_operations ceph_dir_iops; | |
28 | const struct file_operations ceph_dir_fops; | |
29 | struct dentry_operations ceph_dentry_ops; | |
30 | ||
31 | /* | |
32 | * Initialize ceph dentry state. | |
33 | */ | |
34 | int ceph_init_dentry(struct dentry *dentry) | |
35 | { | |
36 | struct ceph_dentry_info *di; | |
37 | ||
38 | if (dentry->d_fsdata) | |
39 | return 0; | |
40 | ||
41 | if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) | |
42 | dentry->d_op = &ceph_dentry_ops; | |
43 | else if (ceph_snap(dentry->d_parent->d_inode) == CEPH_SNAPDIR) | |
44 | dentry->d_op = &ceph_snapdir_dentry_ops; | |
45 | else | |
46 | dentry->d_op = &ceph_snap_dentry_ops; | |
47 | ||
48 | di = kmem_cache_alloc(ceph_dentry_cachep, GFP_NOFS); | |
49 | if (!di) | |
50 | return -ENOMEM; /* oh well */ | |
51 | ||
52 | spin_lock(&dentry->d_lock); | |
53 | if (dentry->d_fsdata) /* lost a race */ | |
54 | goto out_unlock; | |
55 | di->dentry = dentry; | |
56 | di->lease_session = NULL; | |
57 | dentry->d_fsdata = di; | |
58 | dentry->d_time = jiffies; | |
59 | ceph_dentry_lru_add(dentry); | |
60 | out_unlock: | |
61 | spin_unlock(&dentry->d_lock); | |
62 | return 0; | |
63 | } | |
64 | ||
65 | ||
66 | ||
67 | /* | |
68 | * for readdir, we encode the directory frag and offset within that | |
69 | * frag into f_pos. | |
70 | */ | |
71 | static unsigned fpos_frag(loff_t p) | |
72 | { | |
73 | return p >> 32; | |
74 | } | |
75 | static unsigned fpos_off(loff_t p) | |
76 | { | |
77 | return p & 0xffffffff; | |
78 | } | |
79 | ||
80 | /* | |
81 | * When possible, we try to satisfy a readdir by peeking at the | |
82 | * dcache. We make this work by carefully ordering dentries on | |
83 | * d_u.d_child when we initially get results back from the MDS, and | |
84 | * falling back to a "normal" sync readdir if any dentries in the dir | |
85 | * are dropped. | |
86 | * | |
87 | * I_COMPLETE tells indicates we have all dentries in the dir. It is | |
88 | * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by | |
89 | * the MDS if/when the directory is modified). | |
90 | */ | |
91 | static int __dcache_readdir(struct file *filp, | |
92 | void *dirent, filldir_t filldir) | |
93 | { | |
94 | struct inode *inode = filp->f_dentry->d_inode; | |
95 | struct ceph_file_info *fi = filp->private_data; | |
96 | struct dentry *parent = filp->f_dentry; | |
97 | struct inode *dir = parent->d_inode; | |
98 | struct list_head *p; | |
99 | struct dentry *dentry, *last; | |
100 | struct ceph_dentry_info *di; | |
101 | int err = 0; | |
102 | ||
103 | /* claim ref on last dentry we returned */ | |
104 | last = fi->dentry; | |
105 | fi->dentry = NULL; | |
106 | ||
107 | dout("__dcache_readdir %p at %llu (last %p)\n", dir, filp->f_pos, | |
108 | last); | |
109 | ||
110 | spin_lock(&dcache_lock); | |
111 | ||
112 | /* start at beginning? */ | |
113 | if (filp->f_pos == 2 || (last && | |
114 | filp->f_pos < ceph_dentry(last)->offset)) { | |
115 | if (list_empty(&parent->d_subdirs)) | |
116 | goto out_unlock; | |
117 | p = parent->d_subdirs.prev; | |
118 | dout(" initial p %p/%p\n", p->prev, p->next); | |
119 | } else { | |
120 | p = last->d_u.d_child.prev; | |
121 | } | |
122 | ||
123 | more: | |
124 | dentry = list_entry(p, struct dentry, d_u.d_child); | |
125 | di = ceph_dentry(dentry); | |
126 | while (1) { | |
127 | dout(" p %p/%p d_subdirs %p/%p\n", p->prev, p->next, | |
128 | parent->d_subdirs.prev, parent->d_subdirs.next); | |
129 | if (p == &parent->d_subdirs) { | |
130 | fi->at_end = 1; | |
131 | goto out_unlock; | |
132 | } | |
133 | if (!d_unhashed(dentry) && dentry->d_inode && | |
134 | filp->f_pos <= di->offset) | |
135 | break; | |
136 | dout(" skipping %p %.*s at %llu (%llu)%s%s\n", dentry, | |
137 | dentry->d_name.len, dentry->d_name.name, di->offset, | |
138 | filp->f_pos, d_unhashed(dentry) ? " unhashed" : "", | |
139 | !dentry->d_inode ? " null" : ""); | |
140 | p = p->prev; | |
141 | dentry = list_entry(p, struct dentry, d_u.d_child); | |
142 | di = ceph_dentry(dentry); | |
143 | } | |
144 | ||
145 | atomic_inc(&dentry->d_count); | |
146 | spin_unlock(&dcache_lock); | |
147 | spin_unlock(&inode->i_lock); | |
148 | ||
149 | dout(" %llu (%llu) dentry %p %.*s %p\n", di->offset, filp->f_pos, | |
150 | dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode); | |
151 | filp->f_pos = di->offset; | |
152 | err = filldir(dirent, dentry->d_name.name, | |
153 | dentry->d_name.len, di->offset, | |
154 | dentry->d_inode->i_ino, | |
155 | dentry->d_inode->i_mode >> 12); | |
156 | ||
157 | if (last) { | |
158 | if (err < 0) { | |
159 | /* remember our position */ | |
160 | fi->dentry = last; | |
161 | fi->next_offset = di->offset; | |
162 | } else { | |
163 | dput(last); | |
164 | } | |
165 | last = NULL; | |
166 | } | |
167 | ||
168 | spin_lock(&inode->i_lock); | |
169 | spin_lock(&dcache_lock); | |
170 | ||
171 | if (err < 0) | |
172 | goto out_unlock; | |
173 | ||
174 | last = dentry; | |
175 | ||
176 | p = p->prev; | |
177 | filp->f_pos++; | |
178 | ||
179 | /* make sure a dentry wasn't dropped while we didn't have dcache_lock */ | |
180 | if ((ceph_inode(dir)->i_ceph_flags & CEPH_I_COMPLETE)) | |
181 | goto more; | |
182 | dout(" lost I_COMPLETE on %p; falling back to mds\n", dir); | |
183 | err = -EAGAIN; | |
184 | ||
185 | out_unlock: | |
186 | spin_unlock(&dcache_lock); | |
187 | ||
188 | if (last) { | |
189 | spin_unlock(&inode->i_lock); | |
190 | dput(last); | |
191 | spin_lock(&inode->i_lock); | |
192 | } | |
193 | ||
194 | return err; | |
195 | } | |
196 | ||
197 | /* | |
198 | * make note of the last dentry we read, so we can | |
199 | * continue at the same lexicographical point, | |
200 | * regardless of what dir changes take place on the | |
201 | * server. | |
202 | */ | |
203 | static int note_last_dentry(struct ceph_file_info *fi, const char *name, | |
204 | int len) | |
205 | { | |
206 | kfree(fi->last_name); | |
207 | fi->last_name = kmalloc(len+1, GFP_NOFS); | |
208 | if (!fi->last_name) | |
209 | return -ENOMEM; | |
210 | memcpy(fi->last_name, name, len); | |
211 | fi->last_name[len] = 0; | |
212 | dout("note_last_dentry '%s'\n", fi->last_name); | |
213 | return 0; | |
214 | } | |
215 | ||
216 | static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
217 | { | |
218 | struct ceph_file_info *fi = filp->private_data; | |
219 | struct inode *inode = filp->f_dentry->d_inode; | |
220 | struct ceph_inode_info *ci = ceph_inode(inode); | |
221 | struct ceph_client *client = ceph_inode_to_client(inode); | |
222 | struct ceph_mds_client *mdsc = &client->mdsc; | |
223 | unsigned frag = fpos_frag(filp->f_pos); | |
224 | int off = fpos_off(filp->f_pos); | |
225 | int err; | |
226 | u32 ftype; | |
227 | struct ceph_mds_reply_info_parsed *rinfo; | |
228 | const int max_entries = client->mount_args.max_readdir; | |
229 | ||
230 | dout("readdir %p filp %p frag %u off %u\n", inode, filp, frag, off); | |
231 | if (fi->at_end) | |
232 | return 0; | |
233 | ||
234 | /* always start with . and .. */ | |
235 | if (filp->f_pos == 0) { | |
236 | /* note dir version at start of readdir so we can tell | |
237 | * if any dentries get dropped */ | |
238 | fi->dir_release_count = ci->i_release_count; | |
239 | ||
240 | dout("readdir off 0 -> '.'\n"); | |
241 | if (filldir(dirent, ".", 1, ceph_make_fpos(0, 0), | |
242 | inode->i_ino, inode->i_mode >> 12) < 0) | |
243 | return 0; | |
244 | filp->f_pos = 1; | |
245 | off = 1; | |
246 | } | |
247 | if (filp->f_pos == 1) { | |
248 | dout("readdir off 1 -> '..'\n"); | |
249 | if (filldir(dirent, "..", 2, ceph_make_fpos(0, 1), | |
250 | filp->f_dentry->d_parent->d_inode->i_ino, | |
251 | inode->i_mode >> 12) < 0) | |
252 | return 0; | |
253 | filp->f_pos = 2; | |
254 | off = 2; | |
255 | } | |
256 | ||
257 | /* can we use the dcache? */ | |
258 | spin_lock(&inode->i_lock); | |
259 | if ((filp->f_pos == 2 || fi->dentry) && | |
260 | !ceph_test_opt(client, NOASYNCREADDIR) && | |
261 | (ci->i_ceph_flags & CEPH_I_COMPLETE) && | |
262 | __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) { | |
263 | err = __dcache_readdir(filp, dirent, filldir); | |
264 | if (err != -EAGAIN) { | |
265 | spin_unlock(&inode->i_lock); | |
266 | return err; | |
267 | } | |
268 | } | |
269 | spin_unlock(&inode->i_lock); | |
270 | if (fi->dentry) { | |
271 | err = note_last_dentry(fi, fi->dentry->d_name.name, | |
272 | fi->dentry->d_name.len); | |
273 | if (err) | |
274 | return err; | |
275 | dput(fi->dentry); | |
276 | fi->dentry = NULL; | |
277 | } | |
278 | ||
279 | /* proceed with a normal readdir */ | |
280 | ||
281 | more: | |
282 | /* do we have the correct frag content buffered? */ | |
283 | if (fi->frag != frag || fi->last_readdir == NULL) { | |
284 | struct ceph_mds_request *req; | |
285 | int op = ceph_snap(inode) == CEPH_SNAPDIR ? | |
286 | CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR; | |
287 | ||
288 | /* discard old result, if any */ | |
289 | if (fi->last_readdir) | |
290 | ceph_mdsc_put_request(fi->last_readdir); | |
291 | ||
292 | /* requery frag tree, as the frag topology may have changed */ | |
293 | frag = ceph_choose_frag(ceph_inode(inode), frag, NULL, NULL); | |
294 | ||
295 | dout("readdir fetching %llx.%llx frag %x offset '%s'\n", | |
296 | ceph_vinop(inode), frag, fi->last_name); | |
297 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
298 | if (IS_ERR(req)) | |
299 | return PTR_ERR(req); | |
300 | req->r_inode = igrab(inode); | |
301 | req->r_dentry = dget(filp->f_dentry); | |
302 | /* hints to request -> mds selection code */ | |
303 | req->r_direct_mode = USE_AUTH_MDS; | |
304 | req->r_direct_hash = ceph_frag_value(frag); | |
305 | req->r_direct_is_hash = true; | |
306 | req->r_path2 = kstrdup(fi->last_name, GFP_NOFS); | |
307 | req->r_readdir_offset = fi->next_offset; | |
308 | req->r_args.readdir.frag = cpu_to_le32(frag); | |
309 | req->r_args.readdir.max_entries = cpu_to_le32(max_entries); | |
310 | req->r_num_caps = max_entries; | |
311 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
312 | if (err < 0) { | |
313 | ceph_mdsc_put_request(req); | |
314 | return err; | |
315 | } | |
316 | dout("readdir got and parsed readdir result=%d" | |
317 | " on frag %x, end=%d, complete=%d\n", err, frag, | |
318 | (int)req->r_reply_info.dir_end, | |
319 | (int)req->r_reply_info.dir_complete); | |
320 | ||
321 | if (!req->r_did_prepopulate) { | |
322 | dout("readdir !did_prepopulate"); | |
323 | fi->dir_release_count--; /* preclude I_COMPLETE */ | |
324 | } | |
325 | ||
326 | /* note next offset and last dentry name */ | |
327 | fi->offset = fi->next_offset; | |
328 | fi->last_readdir = req; | |
329 | ||
330 | if (req->r_reply_info.dir_end) { | |
331 | kfree(fi->last_name); | |
332 | fi->last_name = NULL; | |
333 | fi->next_offset = 0; | |
334 | } else { | |
335 | rinfo = &req->r_reply_info; | |
336 | err = note_last_dentry(fi, | |
337 | rinfo->dir_dname[rinfo->dir_nr-1], | |
338 | rinfo->dir_dname_len[rinfo->dir_nr-1]); | |
339 | if (err) | |
340 | return err; | |
341 | fi->next_offset += rinfo->dir_nr; | |
342 | } | |
343 | } | |
344 | ||
345 | rinfo = &fi->last_readdir->r_reply_info; | |
346 | dout("readdir frag %x num %d off %d chunkoff %d\n", frag, | |
347 | rinfo->dir_nr, off, fi->offset); | |
348 | while (off - fi->offset >= 0 && off - fi->offset < rinfo->dir_nr) { | |
349 | u64 pos = ceph_make_fpos(frag, off); | |
350 | struct ceph_mds_reply_inode *in = | |
351 | rinfo->dir_in[off - fi->offset].in; | |
352 | dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n", | |
353 | off, off - fi->offset, rinfo->dir_nr, pos, | |
354 | rinfo->dir_dname_len[off - fi->offset], | |
355 | rinfo->dir_dname[off - fi->offset], in); | |
356 | BUG_ON(!in); | |
357 | ftype = le32_to_cpu(in->mode) >> 12; | |
358 | if (filldir(dirent, | |
359 | rinfo->dir_dname[off - fi->offset], | |
360 | rinfo->dir_dname_len[off - fi->offset], | |
361 | pos, | |
362 | le64_to_cpu(in->ino), | |
363 | ftype) < 0) { | |
364 | dout("filldir stopping us...\n"); | |
365 | return 0; | |
366 | } | |
367 | off++; | |
368 | filp->f_pos = pos + 1; | |
369 | } | |
370 | ||
371 | if (fi->last_name) { | |
372 | ceph_mdsc_put_request(fi->last_readdir); | |
373 | fi->last_readdir = NULL; | |
374 | goto more; | |
375 | } | |
376 | ||
377 | /* more frags? */ | |
378 | if (!ceph_frag_is_rightmost(frag)) { | |
379 | frag = ceph_frag_next(frag); | |
380 | off = 0; | |
381 | filp->f_pos = ceph_make_fpos(frag, off); | |
382 | dout("readdir next frag is %x\n", frag); | |
383 | goto more; | |
384 | } | |
385 | fi->at_end = 1; | |
386 | ||
387 | /* | |
388 | * if dir_release_count still matches the dir, no dentries | |
389 | * were released during the whole readdir, and we should have | |
390 | * the complete dir contents in our cache. | |
391 | */ | |
392 | spin_lock(&inode->i_lock); | |
393 | if (ci->i_release_count == fi->dir_release_count) { | |
394 | dout(" marking %p complete\n", inode); | |
395 | ci->i_ceph_flags |= CEPH_I_COMPLETE; | |
396 | ci->i_max_offset = filp->f_pos; | |
397 | } | |
398 | spin_unlock(&inode->i_lock); | |
399 | ||
400 | dout("readdir %p filp %p done.\n", inode, filp); | |
401 | return 0; | |
402 | } | |
403 | ||
404 | static void reset_readdir(struct ceph_file_info *fi) | |
405 | { | |
406 | if (fi->last_readdir) { | |
407 | ceph_mdsc_put_request(fi->last_readdir); | |
408 | fi->last_readdir = NULL; | |
409 | } | |
410 | kfree(fi->last_name); | |
411 | fi->next_offset = 2; /* compensate for . and .. */ | |
412 | if (fi->dentry) { | |
413 | dput(fi->dentry); | |
414 | fi->dentry = NULL; | |
415 | } | |
416 | fi->at_end = 0; | |
417 | } | |
418 | ||
419 | static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int origin) | |
420 | { | |
421 | struct ceph_file_info *fi = file->private_data; | |
422 | struct inode *inode = file->f_mapping->host; | |
423 | loff_t old_offset = offset; | |
424 | loff_t retval; | |
425 | ||
426 | mutex_lock(&inode->i_mutex); | |
427 | switch (origin) { | |
428 | case SEEK_END: | |
429 | offset += inode->i_size + 2; /* FIXME */ | |
430 | break; | |
431 | case SEEK_CUR: | |
432 | offset += file->f_pos; | |
433 | } | |
434 | retval = -EINVAL; | |
435 | if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) { | |
436 | if (offset != file->f_pos) { | |
437 | file->f_pos = offset; | |
438 | file->f_version = 0; | |
439 | fi->at_end = 0; | |
440 | } | |
441 | retval = offset; | |
442 | ||
443 | /* | |
444 | * discard buffered readdir content on seekdir(0), or | |
445 | * seek to new frag, or seek prior to current chunk. | |
446 | */ | |
447 | if (offset == 0 || | |
448 | fpos_frag(offset) != fpos_frag(old_offset) || | |
449 | fpos_off(offset) < fi->offset) { | |
450 | dout("dir_llseek dropping %p content\n", file); | |
451 | reset_readdir(fi); | |
452 | } | |
453 | ||
454 | /* bump dir_release_count if we did a forward seek */ | |
455 | if (offset > old_offset) | |
456 | fi->dir_release_count--; | |
457 | } | |
458 | mutex_unlock(&inode->i_mutex); | |
459 | return retval; | |
460 | } | |
461 | ||
462 | /* | |
463 | * Process result of a lookup/open request. | |
464 | * | |
465 | * Mainly, make sure we return the final req->r_dentry (if it already | |
466 | * existed) in place of the original VFS-provided dentry when they | |
467 | * differ. | |
468 | * | |
469 | * Gracefully handle the case where the MDS replies with -ENOENT and | |
470 | * no trace (which it may do, at its discretion, e.g., if it doesn't | |
471 | * care to issue a lease on the negative dentry). | |
472 | */ | |
473 | struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, | |
474 | struct dentry *dentry, int err) | |
475 | { | |
476 | struct ceph_client *client = ceph_client(dentry->d_sb); | |
477 | struct inode *parent = dentry->d_parent->d_inode; | |
478 | ||
479 | /* .snap dir? */ | |
480 | if (err == -ENOENT && | |
481 | ceph_vino(parent).ino != CEPH_INO_ROOT && /* no .snap in root dir */ | |
482 | strcmp(dentry->d_name.name, client->mount_args.snapdir_name) == 0) { | |
483 | struct inode *inode = ceph_get_snapdir(parent); | |
484 | dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p\n", | |
485 | dentry, dentry->d_name.len, dentry->d_name.name, inode); | |
486 | d_add(dentry, inode); | |
487 | err = 0; | |
488 | } | |
489 | ||
490 | if (err == -ENOENT) { | |
491 | /* no trace? */ | |
492 | err = 0; | |
493 | if (!req->r_reply_info.head->is_dentry) { | |
494 | dout("ENOENT and no trace, dentry %p inode %p\n", | |
495 | dentry, dentry->d_inode); | |
496 | if (dentry->d_inode) { | |
497 | d_drop(dentry); | |
498 | err = -ENOENT; | |
499 | } else { | |
500 | d_add(dentry, NULL); | |
501 | } | |
502 | } | |
503 | } | |
504 | if (err) | |
505 | dentry = ERR_PTR(err); | |
506 | else if (dentry != req->r_dentry) | |
507 | dentry = dget(req->r_dentry); /* we got spliced */ | |
508 | else | |
509 | dentry = NULL; | |
510 | return dentry; | |
511 | } | |
512 | ||
513 | /* | |
514 | * Look up a single dir entry. If there is a lookup intent, inform | |
515 | * the MDS so that it gets our 'caps wanted' value in a single op. | |
516 | */ | |
517 | static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry, | |
518 | struct nameidata *nd) | |
519 | { | |
520 | struct ceph_client *client = ceph_sb_to_client(dir->i_sb); | |
521 | struct ceph_mds_client *mdsc = &client->mdsc; | |
522 | struct ceph_mds_request *req; | |
523 | int op; | |
524 | int err; | |
525 | ||
526 | dout("lookup %p dentry %p '%.*s'\n", | |
527 | dir, dentry, dentry->d_name.len, dentry->d_name.name); | |
528 | ||
529 | if (dentry->d_name.len > NAME_MAX) | |
530 | return ERR_PTR(-ENAMETOOLONG); | |
531 | ||
532 | err = ceph_init_dentry(dentry); | |
533 | if (err < 0) | |
534 | return ERR_PTR(err); | |
535 | ||
536 | /* open (but not create!) intent? */ | |
537 | if (nd && | |
538 | (nd->flags & LOOKUP_OPEN) && | |
539 | (nd->flags & LOOKUP_CONTINUE) == 0 && /* only open last component */ | |
540 | !(nd->intent.open.flags & O_CREAT)) { | |
541 | int mode = nd->intent.open.create_mode & ~current->fs->umask; | |
542 | return ceph_lookup_open(dir, dentry, nd, mode, 1); | |
543 | } | |
544 | ||
545 | /* can we conclude ENOENT locally? */ | |
546 | if (dentry->d_inode == NULL) { | |
547 | struct ceph_inode_info *ci = ceph_inode(dir); | |
548 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
549 | ||
550 | spin_lock(&dir->i_lock); | |
551 | dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags); | |
552 | if (strncmp(dentry->d_name.name, | |
553 | client->mount_args.snapdir_name, | |
554 | dentry->d_name.len) && | |
555 | (ci->i_ceph_flags & CEPH_I_COMPLETE) && | |
556 | (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) { | |
557 | di->offset = ci->i_max_offset++; | |
558 | spin_unlock(&dir->i_lock); | |
559 | dout(" dir %p complete, -ENOENT\n", dir); | |
560 | d_add(dentry, NULL); | |
561 | di->lease_shared_gen = ci->i_shared_gen; | |
562 | return NULL; | |
563 | } | |
564 | spin_unlock(&dir->i_lock); | |
565 | } | |
566 | ||
567 | op = ceph_snap(dir) == CEPH_SNAPDIR ? | |
568 | CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; | |
569 | req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); | |
570 | if (IS_ERR(req)) | |
571 | return ERR_PTR(PTR_ERR(req)); | |
572 | req->r_dentry = dget(dentry); | |
573 | req->r_num_caps = 2; | |
574 | /* we only need inode linkage */ | |
575 | req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); | |
576 | req->r_locked_dir = dir; | |
577 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
578 | dentry = ceph_finish_lookup(req, dentry, err); | |
579 | ceph_mdsc_put_request(req); /* will dput(dentry) */ | |
580 | dout("lookup result=%p\n", dentry); | |
581 | return dentry; | |
582 | } | |
583 | ||
584 | /* | |
585 | * If we do a create but get no trace back from the MDS, follow up with | |
586 | * a lookup (the VFS expects us to link up the provided dentry). | |
587 | */ | |
588 | int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry) | |
589 | { | |
590 | struct dentry *result = ceph_lookup(dir, dentry, NULL); | |
591 | ||
592 | if (result && !IS_ERR(result)) { | |
593 | /* | |
594 | * We created the item, then did a lookup, and found | |
595 | * it was already linked to another inode we already | |
596 | * had in our cache (and thus got spliced). Link our | |
597 | * dentry to that inode, but don't hash it, just in | |
598 | * case the VFS wants to dereference it. | |
599 | */ | |
600 | BUG_ON(!result->d_inode); | |
601 | d_instantiate(dentry, result->d_inode); | |
602 | return 0; | |
603 | } | |
604 | return PTR_ERR(result); | |
605 | } | |
606 | ||
607 | static int ceph_mknod(struct inode *dir, struct dentry *dentry, | |
608 | int mode, dev_t rdev) | |
609 | { | |
610 | struct ceph_client *client = ceph_sb_to_client(dir->i_sb); | |
611 | struct ceph_mds_client *mdsc = &client->mdsc; | |
612 | struct ceph_mds_request *req; | |
613 | int err; | |
614 | ||
615 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
616 | return -EROFS; | |
617 | ||
618 | dout("mknod in dir %p dentry %p mode 0%o rdev %d\n", | |
619 | dir, dentry, mode, rdev); | |
620 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS); | |
621 | if (IS_ERR(req)) { | |
622 | d_drop(dentry); | |
623 | return PTR_ERR(req); | |
624 | } | |
625 | req->r_dentry = dget(dentry); | |
626 | req->r_num_caps = 2; | |
627 | req->r_locked_dir = dir; | |
628 | req->r_args.mknod.mode = cpu_to_le32(mode); | |
629 | req->r_args.mknod.rdev = cpu_to_le32(rdev); | |
630 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
631 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
632 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
633 | if (!err && !req->r_reply_info.head->is_dentry) | |
634 | err = ceph_handle_notrace_create(dir, dentry); | |
635 | ceph_mdsc_put_request(req); | |
636 | if (err) | |
637 | d_drop(dentry); | |
638 | return err; | |
639 | } | |
640 | ||
641 | static int ceph_create(struct inode *dir, struct dentry *dentry, int mode, | |
642 | struct nameidata *nd) | |
643 | { | |
644 | dout("create in dir %p dentry %p name '%.*s'\n", | |
645 | dir, dentry, dentry->d_name.len, dentry->d_name.name); | |
646 | ||
647 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
648 | return -EROFS; | |
649 | ||
650 | if (nd) { | |
651 | BUG_ON((nd->flags & LOOKUP_OPEN) == 0); | |
652 | dentry = ceph_lookup_open(dir, dentry, nd, mode, 0); | |
653 | /* hrm, what should i do here if we get aliased? */ | |
654 | if (IS_ERR(dentry)) | |
655 | return PTR_ERR(dentry); | |
656 | return 0; | |
657 | } | |
658 | ||
659 | /* fall back to mknod */ | |
660 | return ceph_mknod(dir, dentry, (mode & ~S_IFMT) | S_IFREG, 0); | |
661 | } | |
662 | ||
663 | static int ceph_symlink(struct inode *dir, struct dentry *dentry, | |
664 | const char *dest) | |
665 | { | |
666 | struct ceph_client *client = ceph_sb_to_client(dir->i_sb); | |
667 | struct ceph_mds_client *mdsc = &client->mdsc; | |
668 | struct ceph_mds_request *req; | |
669 | int err; | |
670 | ||
671 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
672 | return -EROFS; | |
673 | ||
674 | dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest); | |
675 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS); | |
676 | if (IS_ERR(req)) { | |
677 | d_drop(dentry); | |
678 | return PTR_ERR(req); | |
679 | } | |
680 | req->r_dentry = dget(dentry); | |
681 | req->r_num_caps = 2; | |
682 | req->r_path2 = kstrdup(dest, GFP_NOFS); | |
683 | req->r_locked_dir = dir; | |
684 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
685 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
686 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
687 | if (!err && !req->r_reply_info.head->is_dentry) | |
688 | err = ceph_handle_notrace_create(dir, dentry); | |
689 | ceph_mdsc_put_request(req); | |
690 | if (err) | |
691 | d_drop(dentry); | |
692 | return err; | |
693 | } | |
694 | ||
695 | static int ceph_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
696 | { | |
697 | struct ceph_client *client = ceph_sb_to_client(dir->i_sb); | |
698 | struct ceph_mds_client *mdsc = &client->mdsc; | |
699 | struct ceph_mds_request *req; | |
700 | int err = -EROFS; | |
701 | int op; | |
702 | ||
703 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
704 | /* mkdir .snap/foo is a MKSNAP */ | |
705 | op = CEPH_MDS_OP_MKSNAP; | |
706 | dout("mksnap dir %p snap '%.*s' dn %p\n", dir, | |
707 | dentry->d_name.len, dentry->d_name.name, dentry); | |
708 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { | |
709 | dout("mkdir dir %p dn %p mode 0%o\n", dir, dentry, mode); | |
710 | op = CEPH_MDS_OP_MKDIR; | |
711 | } else { | |
712 | goto out; | |
713 | } | |
714 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
715 | if (IS_ERR(req)) { | |
716 | err = PTR_ERR(req); | |
717 | goto out; | |
718 | } | |
719 | ||
720 | req->r_dentry = dget(dentry); | |
721 | req->r_num_caps = 2; | |
722 | req->r_locked_dir = dir; | |
723 | req->r_args.mkdir.mode = cpu_to_le32(mode); | |
724 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
725 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
726 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
727 | if (!err && !req->r_reply_info.head->is_dentry) | |
728 | err = ceph_handle_notrace_create(dir, dentry); | |
729 | ceph_mdsc_put_request(req); | |
730 | out: | |
731 | if (err < 0) | |
732 | d_drop(dentry); | |
733 | return err; | |
734 | } | |
735 | ||
736 | static int ceph_link(struct dentry *old_dentry, struct inode *dir, | |
737 | struct dentry *dentry) | |
738 | { | |
739 | struct ceph_client *client = ceph_sb_to_client(dir->i_sb); | |
740 | struct ceph_mds_client *mdsc = &client->mdsc; | |
741 | struct ceph_mds_request *req; | |
742 | int err; | |
743 | ||
744 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
745 | return -EROFS; | |
746 | ||
747 | dout("link in dir %p old_dentry %p dentry %p\n", dir, | |
748 | old_dentry, dentry); | |
749 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS); | |
750 | if (IS_ERR(req)) { | |
751 | d_drop(dentry); | |
752 | return PTR_ERR(req); | |
753 | } | |
754 | req->r_dentry = dget(dentry); | |
755 | req->r_num_caps = 2; | |
756 | req->r_old_dentry = dget(old_dentry); /* or inode? hrm. */ | |
757 | req->r_locked_dir = dir; | |
758 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
759 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
760 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
761 | if (err) | |
762 | d_drop(dentry); | |
763 | else if (!req->r_reply_info.head->is_dentry) | |
764 | d_instantiate(dentry, igrab(old_dentry->d_inode)); | |
765 | ceph_mdsc_put_request(req); | |
766 | return err; | |
767 | } | |
768 | ||
769 | /* | |
770 | * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it | |
771 | * looks like the link count will hit 0, drop any other caps (other | |
772 | * than PIN) we don't specifically want (due to the file still being | |
773 | * open). | |
774 | */ | |
775 | static int drop_caps_for_unlink(struct inode *inode) | |
776 | { | |
777 | struct ceph_inode_info *ci = ceph_inode(inode); | |
778 | int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; | |
779 | ||
780 | spin_lock(&inode->i_lock); | |
781 | if (inode->i_nlink == 1) { | |
782 | drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN); | |
783 | ci->i_ceph_flags |= CEPH_I_NODELAY; | |
784 | } | |
785 | spin_unlock(&inode->i_lock); | |
786 | return drop; | |
787 | } | |
788 | ||
789 | /* | |
790 | * rmdir and unlink are differ only by the metadata op code | |
791 | */ | |
792 | static int ceph_unlink(struct inode *dir, struct dentry *dentry) | |
793 | { | |
794 | struct ceph_client *client = ceph_sb_to_client(dir->i_sb); | |
795 | struct ceph_mds_client *mdsc = &client->mdsc; | |
796 | struct inode *inode = dentry->d_inode; | |
797 | struct ceph_mds_request *req; | |
798 | int err = -EROFS; | |
799 | int op; | |
800 | ||
801 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
802 | /* rmdir .snap/foo is RMSNAP */ | |
803 | dout("rmsnap dir %p '%.*s' dn %p\n", dir, dentry->d_name.len, | |
804 | dentry->d_name.name, dentry); | |
805 | op = CEPH_MDS_OP_RMSNAP; | |
806 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { | |
807 | dout("unlink/rmdir dir %p dn %p inode %p\n", | |
808 | dir, dentry, inode); | |
809 | op = ((dentry->d_inode->i_mode & S_IFMT) == S_IFDIR) ? | |
810 | CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK; | |
811 | } else | |
812 | goto out; | |
813 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
814 | if (IS_ERR(req)) { | |
815 | err = PTR_ERR(req); | |
816 | goto out; | |
817 | } | |
818 | req->r_dentry = dget(dentry); | |
819 | req->r_num_caps = 2; | |
820 | req->r_locked_dir = dir; | |
821 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
822 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
823 | req->r_inode_drop = drop_caps_for_unlink(inode); | |
824 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
825 | if (!err && !req->r_reply_info.head->is_dentry) | |
826 | d_delete(dentry); | |
827 | ceph_mdsc_put_request(req); | |
828 | out: | |
829 | return err; | |
830 | } | |
831 | ||
832 | static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry, | |
833 | struct inode *new_dir, struct dentry *new_dentry) | |
834 | { | |
835 | struct ceph_client *client = ceph_sb_to_client(old_dir->i_sb); | |
836 | struct ceph_mds_client *mdsc = &client->mdsc; | |
837 | struct ceph_mds_request *req; | |
838 | int err; | |
839 | ||
840 | if (ceph_snap(old_dir) != ceph_snap(new_dir)) | |
841 | return -EXDEV; | |
842 | if (ceph_snap(old_dir) != CEPH_NOSNAP || | |
843 | ceph_snap(new_dir) != CEPH_NOSNAP) | |
844 | return -EROFS; | |
845 | dout("rename dir %p dentry %p to dir %p dentry %p\n", | |
846 | old_dir, old_dentry, new_dir, new_dentry); | |
847 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RENAME, USE_AUTH_MDS); | |
848 | if (IS_ERR(req)) | |
849 | return PTR_ERR(req); | |
850 | req->r_dentry = dget(new_dentry); | |
851 | req->r_num_caps = 2; | |
852 | req->r_old_dentry = dget(old_dentry); | |
853 | req->r_locked_dir = new_dir; | |
854 | req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED; | |
855 | req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL; | |
856 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
857 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
858 | /* release LINK_RDCACHE on source inode (mds will lock it) */ | |
859 | req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; | |
860 | if (new_dentry->d_inode) | |
861 | req->r_inode_drop = drop_caps_for_unlink(new_dentry->d_inode); | |
862 | err = ceph_mdsc_do_request(mdsc, old_dir, req); | |
863 | if (!err && !req->r_reply_info.head->is_dentry) { | |
864 | /* | |
865 | * Normally d_move() is done by fill_trace (called by | |
866 | * do_request, above). If there is no trace, we need | |
867 | * to do it here. | |
868 | */ | |
869 | d_move(old_dentry, new_dentry); | |
870 | } | |
871 | ceph_mdsc_put_request(req); | |
872 | return err; | |
873 | } | |
874 | ||
875 | ||
876 | /* | |
877 | * Check if dentry lease is valid. If not, delete the lease. Try to | |
878 | * renew if the least is more than half up. | |
879 | */ | |
880 | static int dentry_lease_is_valid(struct dentry *dentry) | |
881 | { | |
882 | struct ceph_dentry_info *di; | |
883 | struct ceph_mds_session *s; | |
884 | int valid = 0; | |
885 | u32 gen; | |
886 | unsigned long ttl; | |
887 | struct ceph_mds_session *session = NULL; | |
888 | struct inode *dir = NULL; | |
889 | u32 seq = 0; | |
890 | ||
891 | spin_lock(&dentry->d_lock); | |
892 | di = ceph_dentry(dentry); | |
893 | if (di && di->lease_session) { | |
894 | s = di->lease_session; | |
895 | spin_lock(&s->s_cap_lock); | |
896 | gen = s->s_cap_gen; | |
897 | ttl = s->s_cap_ttl; | |
898 | spin_unlock(&s->s_cap_lock); | |
899 | ||
900 | if (di->lease_gen == gen && | |
901 | time_before(jiffies, dentry->d_time) && | |
902 | time_before(jiffies, ttl)) { | |
903 | valid = 1; | |
904 | if (di->lease_renew_after && | |
905 | time_after(jiffies, di->lease_renew_after)) { | |
906 | /* we should renew */ | |
907 | dir = dentry->d_parent->d_inode; | |
908 | session = ceph_get_mds_session(s); | |
909 | seq = di->lease_seq; | |
910 | di->lease_renew_after = 0; | |
911 | di->lease_renew_from = jiffies; | |
912 | } | |
913 | } else { | |
914 | __ceph_mdsc_drop_dentry_lease(dentry); | |
915 | } | |
916 | } | |
917 | spin_unlock(&dentry->d_lock); | |
918 | ||
919 | if (session) { | |
920 | ceph_mdsc_lease_send_msg(session, dir, dentry, | |
921 | CEPH_MDS_LEASE_RENEW, seq); | |
922 | ceph_put_mds_session(session); | |
923 | } | |
924 | dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid); | |
925 | return valid; | |
926 | } | |
927 | ||
928 | /* | |
929 | * Check if directory-wide content lease/cap is valid. | |
930 | */ | |
931 | static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry) | |
932 | { | |
933 | struct ceph_inode_info *ci = ceph_inode(dir); | |
934 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
935 | int valid = 0; | |
936 | ||
937 | spin_lock(&dir->i_lock); | |
938 | if (ci->i_shared_gen == di->lease_shared_gen) | |
939 | valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1); | |
940 | spin_unlock(&dir->i_lock); | |
941 | dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n", | |
942 | dir, (unsigned)ci->i_shared_gen, dentry, | |
943 | (unsigned)di->lease_shared_gen, valid); | |
944 | return valid; | |
945 | } | |
946 | ||
947 | /* | |
948 | * Check if cached dentry can be trusted. | |
949 | */ | |
950 | static int ceph_d_revalidate(struct dentry *dentry, struct nameidata *nd) | |
951 | { | |
952 | struct inode *dir = dentry->d_parent->d_inode; | |
953 | ||
954 | dout("d_revalidate %p '%.*s' inode %p\n", dentry, | |
955 | dentry->d_name.len, dentry->d_name.name, dentry->d_inode); | |
956 | ||
957 | /* always trust cached snapped dentries, snapdir dentry */ | |
958 | if (ceph_snap(dir) != CEPH_NOSNAP) { | |
959 | dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry, | |
960 | dentry->d_name.len, dentry->d_name.name, dentry->d_inode); | |
961 | goto out_touch; | |
962 | } | |
963 | if (dentry->d_inode && ceph_snap(dentry->d_inode) == CEPH_SNAPDIR) | |
964 | goto out_touch; | |
965 | ||
966 | if (dentry_lease_is_valid(dentry) || | |
967 | dir_lease_is_valid(dir, dentry)) | |
968 | goto out_touch; | |
969 | ||
970 | dout("d_revalidate %p invalid\n", dentry); | |
971 | d_drop(dentry); | |
972 | return 0; | |
973 | out_touch: | |
974 | ceph_dentry_lru_touch(dentry); | |
975 | return 1; | |
976 | } | |
977 | ||
978 | /* | |
979 | * When a dentry is released, clear the dir I_COMPLETE if it was part | |
980 | * of the current dir gen. | |
981 | */ | |
982 | static void ceph_dentry_release(struct dentry *dentry) | |
983 | { | |
984 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
985 | struct inode *parent_inode = dentry->d_parent->d_inode; | |
986 | ||
987 | if (parent_inode) { | |
988 | struct ceph_inode_info *ci = ceph_inode(parent_inode); | |
989 | ||
990 | spin_lock(&parent_inode->i_lock); | |
991 | if (ci->i_shared_gen == di->lease_shared_gen) { | |
992 | dout(" clearing %p complete (d_release)\n", | |
993 | parent_inode); | |
994 | ci->i_ceph_flags &= ~CEPH_I_COMPLETE; | |
995 | ci->i_release_count++; | |
996 | } | |
997 | spin_unlock(&parent_inode->i_lock); | |
998 | } | |
999 | if (di) { | |
1000 | ceph_dentry_lru_del(dentry); | |
1001 | if (di->lease_session) | |
1002 | ceph_put_mds_session(di->lease_session); | |
1003 | kmem_cache_free(ceph_dentry_cachep, di); | |
1004 | dentry->d_fsdata = NULL; | |
1005 | } | |
1006 | } | |
1007 | ||
1008 | static int ceph_snapdir_d_revalidate(struct dentry *dentry, | |
1009 | struct nameidata *nd) | |
1010 | { | |
1011 | /* | |
1012 | * Eventually, we'll want to revalidate snapped metadata | |
1013 | * too... probably... | |
1014 | */ | |
1015 | return 1; | |
1016 | } | |
1017 | ||
1018 | ||
1019 | ||
1020 | /* | |
1021 | * read() on a dir. This weird interface hack only works if mounted | |
1022 | * with '-o dirstat'. | |
1023 | */ | |
1024 | static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, | |
1025 | loff_t *ppos) | |
1026 | { | |
1027 | struct ceph_file_info *cf = file->private_data; | |
1028 | struct inode *inode = file->f_dentry->d_inode; | |
1029 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1030 | int left; | |
1031 | ||
1032 | if (!ceph_test_opt(ceph_client(inode->i_sb), DIRSTAT)) | |
1033 | return -EISDIR; | |
1034 | ||
1035 | if (!cf->dir_info) { | |
1036 | cf->dir_info = kmalloc(1024, GFP_NOFS); | |
1037 | if (!cf->dir_info) | |
1038 | return -ENOMEM; | |
1039 | cf->dir_info_len = | |
1040 | sprintf(cf->dir_info, | |
1041 | "entries: %20lld\n" | |
1042 | " files: %20lld\n" | |
1043 | " subdirs: %20lld\n" | |
1044 | "rentries: %20lld\n" | |
1045 | " rfiles: %20lld\n" | |
1046 | " rsubdirs: %20lld\n" | |
1047 | "rbytes: %20lld\n" | |
1048 | "rctime: %10ld.%09ld\n", | |
1049 | ci->i_files + ci->i_subdirs, | |
1050 | ci->i_files, | |
1051 | ci->i_subdirs, | |
1052 | ci->i_rfiles + ci->i_rsubdirs, | |
1053 | ci->i_rfiles, | |
1054 | ci->i_rsubdirs, | |
1055 | ci->i_rbytes, | |
1056 | (long)ci->i_rctime.tv_sec, | |
1057 | (long)ci->i_rctime.tv_nsec); | |
1058 | } | |
1059 | ||
1060 | if (*ppos >= cf->dir_info_len) | |
1061 | return 0; | |
1062 | size = min_t(unsigned, size, cf->dir_info_len-*ppos); | |
1063 | left = copy_to_user(buf, cf->dir_info + *ppos, size); | |
1064 | if (left == size) | |
1065 | return -EFAULT; | |
1066 | *ppos += (size - left); | |
1067 | return size - left; | |
1068 | } | |
1069 | ||
1070 | /* | |
1071 | * an fsync() on a dir will wait for any uncommitted directory | |
1072 | * operations to commit. | |
1073 | */ | |
1074 | static int ceph_dir_fsync(struct file *file, struct dentry *dentry, | |
1075 | int datasync) | |
1076 | { | |
1077 | struct inode *inode = dentry->d_inode; | |
1078 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1079 | struct list_head *head = &ci->i_unsafe_dirops; | |
1080 | struct ceph_mds_request *req; | |
1081 | u64 last_tid; | |
1082 | int ret = 0; | |
1083 | ||
1084 | dout("dir_fsync %p\n", inode); | |
1085 | spin_lock(&ci->i_unsafe_lock); | |
1086 | if (list_empty(head)) | |
1087 | goto out; | |
1088 | ||
1089 | req = list_entry(head->prev, | |
1090 | struct ceph_mds_request, r_unsafe_dir_item); | |
1091 | last_tid = req->r_tid; | |
1092 | ||
1093 | do { | |
1094 | ceph_mdsc_get_request(req); | |
1095 | spin_unlock(&ci->i_unsafe_lock); | |
1096 | dout("dir_fsync %p wait on tid %llu (until %llu)\n", | |
1097 | inode, req->r_tid, last_tid); | |
1098 | if (req->r_timeout) { | |
1099 | ret = wait_for_completion_timeout( | |
1100 | &req->r_safe_completion, req->r_timeout); | |
1101 | if (ret > 0) | |
1102 | ret = 0; | |
1103 | else if (ret == 0) | |
1104 | ret = -EIO; /* timed out */ | |
1105 | } else { | |
1106 | wait_for_completion(&req->r_safe_completion); | |
1107 | } | |
1108 | spin_lock(&ci->i_unsafe_lock); | |
1109 | ceph_mdsc_put_request(req); | |
1110 | ||
1111 | if (ret || list_empty(head)) | |
1112 | break; | |
1113 | req = list_entry(head->next, | |
1114 | struct ceph_mds_request, r_unsafe_dir_item); | |
1115 | } while (req->r_tid < last_tid); | |
1116 | out: | |
1117 | spin_unlock(&ci->i_unsafe_lock); | |
1118 | return ret; | |
1119 | } | |
1120 | ||
1121 | /* | |
1122 | * We maintain a private dentry LRU. | |
1123 | * | |
1124 | * FIXME: this needs to be changed to a per-mds lru to be useful. | |
1125 | */ | |
1126 | void ceph_dentry_lru_add(struct dentry *dn) | |
1127 | { | |
1128 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1129 | struct ceph_mds_client *mdsc; | |
1130 | dout("dentry_lru_add %p %p\t%.*s\n", | |
1131 | di, dn, dn->d_name.len, dn->d_name.name); | |
1132 | ||
1133 | if (di) { | |
1134 | mdsc = &ceph_client(dn->d_sb)->mdsc; | |
1135 | spin_lock(&mdsc->dentry_lru_lock); | |
1136 | list_add_tail(&di->lru, &mdsc->dentry_lru); | |
1137 | mdsc->num_dentry++; | |
1138 | spin_unlock(&mdsc->dentry_lru_lock); | |
1139 | } | |
1140 | } | |
1141 | ||
1142 | void ceph_dentry_lru_touch(struct dentry *dn) | |
1143 | { | |
1144 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1145 | struct ceph_mds_client *mdsc; | |
1146 | dout("dentry_lru_touch %p %p\t%.*s\n", | |
1147 | di, dn, dn->d_name.len, dn->d_name.name); | |
1148 | ||
1149 | if (di) { | |
1150 | mdsc = &ceph_client(dn->d_sb)->mdsc; | |
1151 | spin_lock(&mdsc->dentry_lru_lock); | |
1152 | list_move_tail(&di->lru, &mdsc->dentry_lru); | |
1153 | spin_unlock(&mdsc->dentry_lru_lock); | |
1154 | } | |
1155 | } | |
1156 | ||
1157 | void ceph_dentry_lru_del(struct dentry *dn) | |
1158 | { | |
1159 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1160 | struct ceph_mds_client *mdsc; | |
1161 | ||
1162 | dout("dentry_lru_del %p %p\t%.*s\n", | |
1163 | di, dn, dn->d_name.len, dn->d_name.name); | |
1164 | if (di) { | |
1165 | mdsc = &ceph_client(dn->d_sb)->mdsc; | |
1166 | spin_lock(&mdsc->dentry_lru_lock); | |
1167 | list_del_init(&di->lru); | |
1168 | mdsc->num_dentry--; | |
1169 | spin_unlock(&mdsc->dentry_lru_lock); | |
1170 | } | |
1171 | } | |
1172 | ||
1173 | const struct file_operations ceph_dir_fops = { | |
1174 | .read = ceph_read_dir, | |
1175 | .readdir = ceph_readdir, | |
1176 | .llseek = ceph_dir_llseek, | |
1177 | .open = ceph_open, | |
1178 | .release = ceph_release, | |
1179 | .unlocked_ioctl = ceph_ioctl, | |
1180 | .fsync = ceph_dir_fsync, | |
1181 | }; | |
1182 | ||
1183 | const struct inode_operations ceph_dir_iops = { | |
1184 | .lookup = ceph_lookup, | |
1185 | .permission = ceph_permission, | |
1186 | .getattr = ceph_getattr, | |
1187 | .setattr = ceph_setattr, | |
1188 | .setxattr = ceph_setxattr, | |
1189 | .getxattr = ceph_getxattr, | |
1190 | .listxattr = ceph_listxattr, | |
1191 | .removexattr = ceph_removexattr, | |
1192 | .mknod = ceph_mknod, | |
1193 | .symlink = ceph_symlink, | |
1194 | .mkdir = ceph_mkdir, | |
1195 | .link = ceph_link, | |
1196 | .unlink = ceph_unlink, | |
1197 | .rmdir = ceph_unlink, | |
1198 | .rename = ceph_rename, | |
1199 | .create = ceph_create, | |
1200 | }; | |
1201 | ||
1202 | struct dentry_operations ceph_dentry_ops = { | |
1203 | .d_revalidate = ceph_d_revalidate, | |
1204 | .d_release = ceph_dentry_release, | |
1205 | }; | |
1206 | ||
1207 | struct dentry_operations ceph_snapdir_dentry_ops = { | |
1208 | .d_revalidate = ceph_snapdir_d_revalidate, | |
1209 | }; | |
1210 | ||
1211 | struct dentry_operations ceph_snap_dentry_ops = { | |
1212 | }; |