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Commit | Line | Data |
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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 && | |
09b8a7d2 | 134 | ceph_snap(dentry->d_inode) != CEPH_SNAPDIR && |
2817b000 SW |
135 | filp->f_pos <= di->offset) |
136 | break; | |
137 | dout(" skipping %p %.*s at %llu (%llu)%s%s\n", dentry, | |
138 | dentry->d_name.len, dentry->d_name.name, di->offset, | |
139 | filp->f_pos, d_unhashed(dentry) ? " unhashed" : "", | |
140 | !dentry->d_inode ? " null" : ""); | |
141 | p = p->prev; | |
142 | dentry = list_entry(p, struct dentry, d_u.d_child); | |
143 | di = ceph_dentry(dentry); | |
144 | } | |
145 | ||
146 | atomic_inc(&dentry->d_count); | |
147 | spin_unlock(&dcache_lock); | |
148 | spin_unlock(&inode->i_lock); | |
149 | ||
150 | dout(" %llu (%llu) dentry %p %.*s %p\n", di->offset, filp->f_pos, | |
151 | dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode); | |
152 | filp->f_pos = di->offset; | |
153 | err = filldir(dirent, dentry->d_name.name, | |
154 | dentry->d_name.len, di->offset, | |
155 | dentry->d_inode->i_ino, | |
156 | dentry->d_inode->i_mode >> 12); | |
157 | ||
158 | if (last) { | |
159 | if (err < 0) { | |
160 | /* remember our position */ | |
161 | fi->dentry = last; | |
162 | fi->next_offset = di->offset; | |
163 | } else { | |
164 | dput(last); | |
165 | } | |
166 | last = NULL; | |
167 | } | |
168 | ||
169 | spin_lock(&inode->i_lock); | |
170 | spin_lock(&dcache_lock); | |
171 | ||
172 | if (err < 0) | |
173 | goto out_unlock; | |
174 | ||
175 | last = dentry; | |
176 | ||
177 | p = p->prev; | |
178 | filp->f_pos++; | |
179 | ||
180 | /* make sure a dentry wasn't dropped while we didn't have dcache_lock */ | |
181 | if ((ceph_inode(dir)->i_ceph_flags & CEPH_I_COMPLETE)) | |
182 | goto more; | |
183 | dout(" lost I_COMPLETE on %p; falling back to mds\n", dir); | |
184 | err = -EAGAIN; | |
185 | ||
186 | out_unlock: | |
187 | spin_unlock(&dcache_lock); | |
188 | ||
189 | if (last) { | |
190 | spin_unlock(&inode->i_lock); | |
191 | dput(last); | |
192 | spin_lock(&inode->i_lock); | |
193 | } | |
194 | ||
195 | return err; | |
196 | } | |
197 | ||
198 | /* | |
199 | * make note of the last dentry we read, so we can | |
200 | * continue at the same lexicographical point, | |
201 | * regardless of what dir changes take place on the | |
202 | * server. | |
203 | */ | |
204 | static int note_last_dentry(struct ceph_file_info *fi, const char *name, | |
205 | int len) | |
206 | { | |
207 | kfree(fi->last_name); | |
208 | fi->last_name = kmalloc(len+1, GFP_NOFS); | |
209 | if (!fi->last_name) | |
210 | return -ENOMEM; | |
211 | memcpy(fi->last_name, name, len); | |
212 | fi->last_name[len] = 0; | |
213 | dout("note_last_dentry '%s'\n", fi->last_name); | |
214 | return 0; | |
215 | } | |
216 | ||
217 | static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
218 | { | |
219 | struct ceph_file_info *fi = filp->private_data; | |
220 | struct inode *inode = filp->f_dentry->d_inode; | |
221 | struct ceph_inode_info *ci = ceph_inode(inode); | |
222 | struct ceph_client *client = ceph_inode_to_client(inode); | |
223 | struct ceph_mds_client *mdsc = &client->mdsc; | |
224 | unsigned frag = fpos_frag(filp->f_pos); | |
225 | int off = fpos_off(filp->f_pos); | |
226 | int err; | |
227 | u32 ftype; | |
228 | struct ceph_mds_reply_info_parsed *rinfo; | |
6b805185 | 229 | const int max_entries = client->mount_args->max_readdir; |
2817b000 SW |
230 | |
231 | dout("readdir %p filp %p frag %u off %u\n", inode, filp, frag, off); | |
232 | if (fi->at_end) | |
233 | return 0; | |
234 | ||
235 | /* always start with . and .. */ | |
236 | if (filp->f_pos == 0) { | |
237 | /* note dir version at start of readdir so we can tell | |
238 | * if any dentries get dropped */ | |
239 | fi->dir_release_count = ci->i_release_count; | |
240 | ||
241 | dout("readdir off 0 -> '.'\n"); | |
242 | if (filldir(dirent, ".", 1, ceph_make_fpos(0, 0), | |
243 | inode->i_ino, inode->i_mode >> 12) < 0) | |
244 | return 0; | |
245 | filp->f_pos = 1; | |
246 | off = 1; | |
247 | } | |
248 | if (filp->f_pos == 1) { | |
249 | dout("readdir off 1 -> '..'\n"); | |
250 | if (filldir(dirent, "..", 2, ceph_make_fpos(0, 1), | |
251 | filp->f_dentry->d_parent->d_inode->i_ino, | |
252 | inode->i_mode >> 12) < 0) | |
253 | return 0; | |
254 | filp->f_pos = 2; | |
255 | off = 2; | |
256 | } | |
257 | ||
258 | /* can we use the dcache? */ | |
259 | spin_lock(&inode->i_lock); | |
260 | if ((filp->f_pos == 2 || fi->dentry) && | |
261 | !ceph_test_opt(client, NOASYNCREADDIR) && | |
262 | (ci->i_ceph_flags & CEPH_I_COMPLETE) && | |
263 | __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) { | |
264 | err = __dcache_readdir(filp, dirent, filldir); | |
265 | if (err != -EAGAIN) { | |
266 | spin_unlock(&inode->i_lock); | |
267 | return err; | |
268 | } | |
269 | } | |
270 | spin_unlock(&inode->i_lock); | |
271 | if (fi->dentry) { | |
272 | err = note_last_dentry(fi, fi->dentry->d_name.name, | |
273 | fi->dentry->d_name.len); | |
274 | if (err) | |
275 | return err; | |
276 | dput(fi->dentry); | |
277 | fi->dentry = NULL; | |
278 | } | |
279 | ||
280 | /* proceed with a normal readdir */ | |
281 | ||
282 | more: | |
283 | /* do we have the correct frag content buffered? */ | |
284 | if (fi->frag != frag || fi->last_readdir == NULL) { | |
285 | struct ceph_mds_request *req; | |
286 | int op = ceph_snap(inode) == CEPH_SNAPDIR ? | |
287 | CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR; | |
288 | ||
289 | /* discard old result, if any */ | |
290 | if (fi->last_readdir) | |
291 | ceph_mdsc_put_request(fi->last_readdir); | |
292 | ||
293 | /* requery frag tree, as the frag topology may have changed */ | |
294 | frag = ceph_choose_frag(ceph_inode(inode), frag, NULL, NULL); | |
295 | ||
296 | dout("readdir fetching %llx.%llx frag %x offset '%s'\n", | |
297 | ceph_vinop(inode), frag, fi->last_name); | |
298 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
299 | if (IS_ERR(req)) | |
300 | return PTR_ERR(req); | |
301 | req->r_inode = igrab(inode); | |
302 | req->r_dentry = dget(filp->f_dentry); | |
303 | /* hints to request -> mds selection code */ | |
304 | req->r_direct_mode = USE_AUTH_MDS; | |
305 | req->r_direct_hash = ceph_frag_value(frag); | |
306 | req->r_direct_is_hash = true; | |
307 | req->r_path2 = kstrdup(fi->last_name, GFP_NOFS); | |
308 | req->r_readdir_offset = fi->next_offset; | |
309 | req->r_args.readdir.frag = cpu_to_le32(frag); | |
310 | req->r_args.readdir.max_entries = cpu_to_le32(max_entries); | |
311 | req->r_num_caps = max_entries; | |
312 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
313 | if (err < 0) { | |
314 | ceph_mdsc_put_request(req); | |
315 | return err; | |
316 | } | |
317 | dout("readdir got and parsed readdir result=%d" | |
318 | " on frag %x, end=%d, complete=%d\n", err, frag, | |
319 | (int)req->r_reply_info.dir_end, | |
320 | (int)req->r_reply_info.dir_complete); | |
321 | ||
322 | if (!req->r_did_prepopulate) { | |
323 | dout("readdir !did_prepopulate"); | |
324 | fi->dir_release_count--; /* preclude I_COMPLETE */ | |
325 | } | |
326 | ||
327 | /* note next offset and last dentry name */ | |
328 | fi->offset = fi->next_offset; | |
329 | fi->last_readdir = req; | |
330 | ||
331 | if (req->r_reply_info.dir_end) { | |
332 | kfree(fi->last_name); | |
333 | fi->last_name = NULL; | |
334 | fi->next_offset = 0; | |
335 | } else { | |
336 | rinfo = &req->r_reply_info; | |
337 | err = note_last_dentry(fi, | |
338 | rinfo->dir_dname[rinfo->dir_nr-1], | |
339 | rinfo->dir_dname_len[rinfo->dir_nr-1]); | |
340 | if (err) | |
341 | return err; | |
342 | fi->next_offset += rinfo->dir_nr; | |
343 | } | |
344 | } | |
345 | ||
346 | rinfo = &fi->last_readdir->r_reply_info; | |
347 | dout("readdir frag %x num %d off %d chunkoff %d\n", frag, | |
348 | rinfo->dir_nr, off, fi->offset); | |
349 | while (off - fi->offset >= 0 && off - fi->offset < rinfo->dir_nr) { | |
350 | u64 pos = ceph_make_fpos(frag, off); | |
351 | struct ceph_mds_reply_inode *in = | |
352 | rinfo->dir_in[off - fi->offset].in; | |
353 | dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n", | |
354 | off, off - fi->offset, rinfo->dir_nr, pos, | |
355 | rinfo->dir_dname_len[off - fi->offset], | |
356 | rinfo->dir_dname[off - fi->offset], in); | |
357 | BUG_ON(!in); | |
358 | ftype = le32_to_cpu(in->mode) >> 12; | |
359 | if (filldir(dirent, | |
360 | rinfo->dir_dname[off - fi->offset], | |
361 | rinfo->dir_dname_len[off - fi->offset], | |
362 | pos, | |
363 | le64_to_cpu(in->ino), | |
364 | ftype) < 0) { | |
365 | dout("filldir stopping us...\n"); | |
366 | return 0; | |
367 | } | |
368 | off++; | |
369 | filp->f_pos = pos + 1; | |
370 | } | |
371 | ||
372 | if (fi->last_name) { | |
373 | ceph_mdsc_put_request(fi->last_readdir); | |
374 | fi->last_readdir = NULL; | |
375 | goto more; | |
376 | } | |
377 | ||
378 | /* more frags? */ | |
379 | if (!ceph_frag_is_rightmost(frag)) { | |
380 | frag = ceph_frag_next(frag); | |
381 | off = 0; | |
382 | filp->f_pos = ceph_make_fpos(frag, off); | |
383 | dout("readdir next frag is %x\n", frag); | |
384 | goto more; | |
385 | } | |
386 | fi->at_end = 1; | |
387 | ||
388 | /* | |
389 | * if dir_release_count still matches the dir, no dentries | |
390 | * were released during the whole readdir, and we should have | |
391 | * the complete dir contents in our cache. | |
392 | */ | |
393 | spin_lock(&inode->i_lock); | |
394 | if (ci->i_release_count == fi->dir_release_count) { | |
395 | dout(" marking %p complete\n", inode); | |
396 | ci->i_ceph_flags |= CEPH_I_COMPLETE; | |
397 | ci->i_max_offset = filp->f_pos; | |
398 | } | |
399 | spin_unlock(&inode->i_lock); | |
400 | ||
401 | dout("readdir %p filp %p done.\n", inode, filp); | |
402 | return 0; | |
403 | } | |
404 | ||
405 | static void reset_readdir(struct ceph_file_info *fi) | |
406 | { | |
407 | if (fi->last_readdir) { | |
408 | ceph_mdsc_put_request(fi->last_readdir); | |
409 | fi->last_readdir = NULL; | |
410 | } | |
411 | kfree(fi->last_name); | |
412 | fi->next_offset = 2; /* compensate for . and .. */ | |
413 | if (fi->dentry) { | |
414 | dput(fi->dentry); | |
415 | fi->dentry = NULL; | |
416 | } | |
417 | fi->at_end = 0; | |
418 | } | |
419 | ||
420 | static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int origin) | |
421 | { | |
422 | struct ceph_file_info *fi = file->private_data; | |
423 | struct inode *inode = file->f_mapping->host; | |
424 | loff_t old_offset = offset; | |
425 | loff_t retval; | |
426 | ||
427 | mutex_lock(&inode->i_mutex); | |
428 | switch (origin) { | |
429 | case SEEK_END: | |
430 | offset += inode->i_size + 2; /* FIXME */ | |
431 | break; | |
432 | case SEEK_CUR: | |
433 | offset += file->f_pos; | |
434 | } | |
435 | retval = -EINVAL; | |
436 | if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) { | |
437 | if (offset != file->f_pos) { | |
438 | file->f_pos = offset; | |
439 | file->f_version = 0; | |
440 | fi->at_end = 0; | |
441 | } | |
442 | retval = offset; | |
443 | ||
444 | /* | |
445 | * discard buffered readdir content on seekdir(0), or | |
446 | * seek to new frag, or seek prior to current chunk. | |
447 | */ | |
448 | if (offset == 0 || | |
449 | fpos_frag(offset) != fpos_frag(old_offset) || | |
450 | fpos_off(offset) < fi->offset) { | |
451 | dout("dir_llseek dropping %p content\n", file); | |
452 | reset_readdir(fi); | |
453 | } | |
454 | ||
455 | /* bump dir_release_count if we did a forward seek */ | |
456 | if (offset > old_offset) | |
457 | fi->dir_release_count--; | |
458 | } | |
459 | mutex_unlock(&inode->i_mutex); | |
460 | return retval; | |
461 | } | |
462 | ||
463 | /* | |
464 | * Process result of a lookup/open request. | |
465 | * | |
466 | * Mainly, make sure we return the final req->r_dentry (if it already | |
467 | * existed) in place of the original VFS-provided dentry when they | |
468 | * differ. | |
469 | * | |
470 | * Gracefully handle the case where the MDS replies with -ENOENT and | |
471 | * no trace (which it may do, at its discretion, e.g., if it doesn't | |
472 | * care to issue a lease on the negative dentry). | |
473 | */ | |
474 | struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, | |
475 | struct dentry *dentry, int err) | |
476 | { | |
477 | struct ceph_client *client = ceph_client(dentry->d_sb); | |
478 | struct inode *parent = dentry->d_parent->d_inode; | |
479 | ||
480 | /* .snap dir? */ | |
481 | if (err == -ENOENT && | |
482 | ceph_vino(parent).ino != CEPH_INO_ROOT && /* no .snap in root dir */ | |
6b805185 SW |
483 | strcmp(dentry->d_name.name, |
484 | client->mount_args->snapdir_name) == 0) { | |
2817b000 SW |
485 | struct inode *inode = ceph_get_snapdir(parent); |
486 | dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p\n", | |
487 | dentry, dentry->d_name.len, dentry->d_name.name, inode); | |
488 | d_add(dentry, inode); | |
489 | err = 0; | |
490 | } | |
491 | ||
492 | if (err == -ENOENT) { | |
493 | /* no trace? */ | |
494 | err = 0; | |
495 | if (!req->r_reply_info.head->is_dentry) { | |
496 | dout("ENOENT and no trace, dentry %p inode %p\n", | |
497 | dentry, dentry->d_inode); | |
498 | if (dentry->d_inode) { | |
499 | d_drop(dentry); | |
500 | err = -ENOENT; | |
501 | } else { | |
502 | d_add(dentry, NULL); | |
503 | } | |
504 | } | |
505 | } | |
506 | if (err) | |
507 | dentry = ERR_PTR(err); | |
508 | else if (dentry != req->r_dentry) | |
509 | dentry = dget(req->r_dentry); /* we got spliced */ | |
510 | else | |
511 | dentry = NULL; | |
512 | return dentry; | |
513 | } | |
514 | ||
515 | /* | |
516 | * Look up a single dir entry. If there is a lookup intent, inform | |
517 | * the MDS so that it gets our 'caps wanted' value in a single op. | |
518 | */ | |
519 | static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry, | |
520 | struct nameidata *nd) | |
521 | { | |
522 | struct ceph_client *client = ceph_sb_to_client(dir->i_sb); | |
523 | struct ceph_mds_client *mdsc = &client->mdsc; | |
524 | struct ceph_mds_request *req; | |
525 | int op; | |
526 | int err; | |
527 | ||
528 | dout("lookup %p dentry %p '%.*s'\n", | |
529 | dir, dentry, dentry->d_name.len, dentry->d_name.name); | |
530 | ||
531 | if (dentry->d_name.len > NAME_MAX) | |
532 | return ERR_PTR(-ENAMETOOLONG); | |
533 | ||
534 | err = ceph_init_dentry(dentry); | |
535 | if (err < 0) | |
536 | return ERR_PTR(err); | |
537 | ||
538 | /* open (but not create!) intent? */ | |
539 | if (nd && | |
540 | (nd->flags & LOOKUP_OPEN) && | |
541 | (nd->flags & LOOKUP_CONTINUE) == 0 && /* only open last component */ | |
542 | !(nd->intent.open.flags & O_CREAT)) { | |
543 | int mode = nd->intent.open.create_mode & ~current->fs->umask; | |
544 | return ceph_lookup_open(dir, dentry, nd, mode, 1); | |
545 | } | |
546 | ||
547 | /* can we conclude ENOENT locally? */ | |
548 | if (dentry->d_inode == NULL) { | |
549 | struct ceph_inode_info *ci = ceph_inode(dir); | |
550 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
551 | ||
552 | spin_lock(&dir->i_lock); | |
553 | dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags); | |
554 | if (strncmp(dentry->d_name.name, | |
6b805185 | 555 | client->mount_args->snapdir_name, |
2817b000 SW |
556 | dentry->d_name.len) && |
557 | (ci->i_ceph_flags & CEPH_I_COMPLETE) && | |
558 | (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) { | |
559 | di->offset = ci->i_max_offset++; | |
560 | spin_unlock(&dir->i_lock); | |
561 | dout(" dir %p complete, -ENOENT\n", dir); | |
562 | d_add(dentry, NULL); | |
563 | di->lease_shared_gen = ci->i_shared_gen; | |
564 | return NULL; | |
565 | } | |
566 | spin_unlock(&dir->i_lock); | |
567 | } | |
568 | ||
569 | op = ceph_snap(dir) == CEPH_SNAPDIR ? | |
570 | CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; | |
571 | req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); | |
572 | if (IS_ERR(req)) | |
573 | return ERR_PTR(PTR_ERR(req)); | |
574 | req->r_dentry = dget(dentry); | |
575 | req->r_num_caps = 2; | |
576 | /* we only need inode linkage */ | |
577 | req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); | |
578 | req->r_locked_dir = dir; | |
579 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
580 | dentry = ceph_finish_lookup(req, dentry, err); | |
581 | ceph_mdsc_put_request(req); /* will dput(dentry) */ | |
582 | dout("lookup result=%p\n", dentry); | |
583 | return dentry; | |
584 | } | |
585 | ||
586 | /* | |
587 | * If we do a create but get no trace back from the MDS, follow up with | |
588 | * a lookup (the VFS expects us to link up the provided dentry). | |
589 | */ | |
590 | int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry) | |
591 | { | |
592 | struct dentry *result = ceph_lookup(dir, dentry, NULL); | |
593 | ||
594 | if (result && !IS_ERR(result)) { | |
595 | /* | |
596 | * We created the item, then did a lookup, and found | |
597 | * it was already linked to another inode we already | |
598 | * had in our cache (and thus got spliced). Link our | |
599 | * dentry to that inode, but don't hash it, just in | |
600 | * case the VFS wants to dereference it. | |
601 | */ | |
602 | BUG_ON(!result->d_inode); | |
603 | d_instantiate(dentry, result->d_inode); | |
604 | return 0; | |
605 | } | |
606 | return PTR_ERR(result); | |
607 | } | |
608 | ||
609 | static int ceph_mknod(struct inode *dir, struct dentry *dentry, | |
610 | int mode, dev_t rdev) | |
611 | { | |
612 | struct ceph_client *client = ceph_sb_to_client(dir->i_sb); | |
613 | struct ceph_mds_client *mdsc = &client->mdsc; | |
614 | struct ceph_mds_request *req; | |
615 | int err; | |
616 | ||
617 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
618 | return -EROFS; | |
619 | ||
620 | dout("mknod in dir %p dentry %p mode 0%o rdev %d\n", | |
621 | dir, dentry, mode, rdev); | |
622 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS); | |
623 | if (IS_ERR(req)) { | |
624 | d_drop(dentry); | |
625 | return PTR_ERR(req); | |
626 | } | |
627 | req->r_dentry = dget(dentry); | |
628 | req->r_num_caps = 2; | |
629 | req->r_locked_dir = dir; | |
630 | req->r_args.mknod.mode = cpu_to_le32(mode); | |
631 | req->r_args.mknod.rdev = cpu_to_le32(rdev); | |
632 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
633 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
634 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
635 | if (!err && !req->r_reply_info.head->is_dentry) | |
636 | err = ceph_handle_notrace_create(dir, dentry); | |
637 | ceph_mdsc_put_request(req); | |
638 | if (err) | |
639 | d_drop(dentry); | |
640 | return err; | |
641 | } | |
642 | ||
643 | static int ceph_create(struct inode *dir, struct dentry *dentry, int mode, | |
644 | struct nameidata *nd) | |
645 | { | |
646 | dout("create in dir %p dentry %p name '%.*s'\n", | |
647 | dir, dentry, dentry->d_name.len, dentry->d_name.name); | |
648 | ||
649 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
650 | return -EROFS; | |
651 | ||
652 | if (nd) { | |
653 | BUG_ON((nd->flags & LOOKUP_OPEN) == 0); | |
654 | dentry = ceph_lookup_open(dir, dentry, nd, mode, 0); | |
655 | /* hrm, what should i do here if we get aliased? */ | |
656 | if (IS_ERR(dentry)) | |
657 | return PTR_ERR(dentry); | |
658 | return 0; | |
659 | } | |
660 | ||
661 | /* fall back to mknod */ | |
662 | return ceph_mknod(dir, dentry, (mode & ~S_IFMT) | S_IFREG, 0); | |
663 | } | |
664 | ||
665 | static int ceph_symlink(struct inode *dir, struct dentry *dentry, | |
666 | const char *dest) | |
667 | { | |
668 | struct ceph_client *client = ceph_sb_to_client(dir->i_sb); | |
669 | struct ceph_mds_client *mdsc = &client->mdsc; | |
670 | struct ceph_mds_request *req; | |
671 | int err; | |
672 | ||
673 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
674 | return -EROFS; | |
675 | ||
676 | dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest); | |
677 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS); | |
678 | if (IS_ERR(req)) { | |
679 | d_drop(dentry); | |
680 | return PTR_ERR(req); | |
681 | } | |
682 | req->r_dentry = dget(dentry); | |
683 | req->r_num_caps = 2; | |
684 | req->r_path2 = kstrdup(dest, GFP_NOFS); | |
685 | req->r_locked_dir = dir; | |
686 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
687 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
688 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
689 | if (!err && !req->r_reply_info.head->is_dentry) | |
690 | err = ceph_handle_notrace_create(dir, dentry); | |
691 | ceph_mdsc_put_request(req); | |
692 | if (err) | |
693 | d_drop(dentry); | |
694 | return err; | |
695 | } | |
696 | ||
697 | static int ceph_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
698 | { | |
699 | struct ceph_client *client = ceph_sb_to_client(dir->i_sb); | |
700 | struct ceph_mds_client *mdsc = &client->mdsc; | |
701 | struct ceph_mds_request *req; | |
702 | int err = -EROFS; | |
703 | int op; | |
704 | ||
705 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
706 | /* mkdir .snap/foo is a MKSNAP */ | |
707 | op = CEPH_MDS_OP_MKSNAP; | |
708 | dout("mksnap dir %p snap '%.*s' dn %p\n", dir, | |
709 | dentry->d_name.len, dentry->d_name.name, dentry); | |
710 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { | |
711 | dout("mkdir dir %p dn %p mode 0%o\n", dir, dentry, mode); | |
712 | op = CEPH_MDS_OP_MKDIR; | |
713 | } else { | |
714 | goto out; | |
715 | } | |
716 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
717 | if (IS_ERR(req)) { | |
718 | err = PTR_ERR(req); | |
719 | goto out; | |
720 | } | |
721 | ||
722 | req->r_dentry = dget(dentry); | |
723 | req->r_num_caps = 2; | |
724 | req->r_locked_dir = dir; | |
725 | req->r_args.mkdir.mode = cpu_to_le32(mode); | |
726 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
727 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
728 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
729 | if (!err && !req->r_reply_info.head->is_dentry) | |
730 | err = ceph_handle_notrace_create(dir, dentry); | |
731 | ceph_mdsc_put_request(req); | |
732 | out: | |
733 | if (err < 0) | |
734 | d_drop(dentry); | |
735 | return err; | |
736 | } | |
737 | ||
738 | static int ceph_link(struct dentry *old_dentry, struct inode *dir, | |
739 | struct dentry *dentry) | |
740 | { | |
741 | struct ceph_client *client = ceph_sb_to_client(dir->i_sb); | |
742 | struct ceph_mds_client *mdsc = &client->mdsc; | |
743 | struct ceph_mds_request *req; | |
744 | int err; | |
745 | ||
746 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
747 | return -EROFS; | |
748 | ||
749 | dout("link in dir %p old_dentry %p dentry %p\n", dir, | |
750 | old_dentry, dentry); | |
751 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS); | |
752 | if (IS_ERR(req)) { | |
753 | d_drop(dentry); | |
754 | return PTR_ERR(req); | |
755 | } | |
756 | req->r_dentry = dget(dentry); | |
757 | req->r_num_caps = 2; | |
758 | req->r_old_dentry = dget(old_dentry); /* or inode? hrm. */ | |
759 | req->r_locked_dir = dir; | |
760 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
761 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
762 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
763 | if (err) | |
764 | d_drop(dentry); | |
765 | else if (!req->r_reply_info.head->is_dentry) | |
766 | d_instantiate(dentry, igrab(old_dentry->d_inode)); | |
767 | ceph_mdsc_put_request(req); | |
768 | return err; | |
769 | } | |
770 | ||
771 | /* | |
772 | * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it | |
773 | * looks like the link count will hit 0, drop any other caps (other | |
774 | * than PIN) we don't specifically want (due to the file still being | |
775 | * open). | |
776 | */ | |
777 | static int drop_caps_for_unlink(struct inode *inode) | |
778 | { | |
779 | struct ceph_inode_info *ci = ceph_inode(inode); | |
780 | int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; | |
781 | ||
782 | spin_lock(&inode->i_lock); | |
783 | if (inode->i_nlink == 1) { | |
784 | drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN); | |
785 | ci->i_ceph_flags |= CEPH_I_NODELAY; | |
786 | } | |
787 | spin_unlock(&inode->i_lock); | |
788 | return drop; | |
789 | } | |
790 | ||
791 | /* | |
792 | * rmdir and unlink are differ only by the metadata op code | |
793 | */ | |
794 | static int ceph_unlink(struct inode *dir, struct dentry *dentry) | |
795 | { | |
796 | struct ceph_client *client = ceph_sb_to_client(dir->i_sb); | |
797 | struct ceph_mds_client *mdsc = &client->mdsc; | |
798 | struct inode *inode = dentry->d_inode; | |
799 | struct ceph_mds_request *req; | |
800 | int err = -EROFS; | |
801 | int op; | |
802 | ||
803 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
804 | /* rmdir .snap/foo is RMSNAP */ | |
805 | dout("rmsnap dir %p '%.*s' dn %p\n", dir, dentry->d_name.len, | |
806 | dentry->d_name.name, dentry); | |
807 | op = CEPH_MDS_OP_RMSNAP; | |
808 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { | |
809 | dout("unlink/rmdir dir %p dn %p inode %p\n", | |
810 | dir, dentry, inode); | |
811 | op = ((dentry->d_inode->i_mode & S_IFMT) == S_IFDIR) ? | |
812 | CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK; | |
813 | } else | |
814 | goto out; | |
815 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
816 | if (IS_ERR(req)) { | |
817 | err = PTR_ERR(req); | |
818 | goto out; | |
819 | } | |
820 | req->r_dentry = dget(dentry); | |
821 | req->r_num_caps = 2; | |
822 | req->r_locked_dir = dir; | |
823 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
824 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
825 | req->r_inode_drop = drop_caps_for_unlink(inode); | |
826 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
827 | if (!err && !req->r_reply_info.head->is_dentry) | |
828 | d_delete(dentry); | |
829 | ceph_mdsc_put_request(req); | |
830 | out: | |
831 | return err; | |
832 | } | |
833 | ||
834 | static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry, | |
835 | struct inode *new_dir, struct dentry *new_dentry) | |
836 | { | |
837 | struct ceph_client *client = ceph_sb_to_client(old_dir->i_sb); | |
838 | struct ceph_mds_client *mdsc = &client->mdsc; | |
839 | struct ceph_mds_request *req; | |
840 | int err; | |
841 | ||
842 | if (ceph_snap(old_dir) != ceph_snap(new_dir)) | |
843 | return -EXDEV; | |
844 | if (ceph_snap(old_dir) != CEPH_NOSNAP || | |
845 | ceph_snap(new_dir) != CEPH_NOSNAP) | |
846 | return -EROFS; | |
847 | dout("rename dir %p dentry %p to dir %p dentry %p\n", | |
848 | old_dir, old_dentry, new_dir, new_dentry); | |
849 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RENAME, USE_AUTH_MDS); | |
850 | if (IS_ERR(req)) | |
851 | return PTR_ERR(req); | |
852 | req->r_dentry = dget(new_dentry); | |
853 | req->r_num_caps = 2; | |
854 | req->r_old_dentry = dget(old_dentry); | |
855 | req->r_locked_dir = new_dir; | |
856 | req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED; | |
857 | req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL; | |
858 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
859 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
860 | /* release LINK_RDCACHE on source inode (mds will lock it) */ | |
861 | req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; | |
862 | if (new_dentry->d_inode) | |
863 | req->r_inode_drop = drop_caps_for_unlink(new_dentry->d_inode); | |
864 | err = ceph_mdsc_do_request(mdsc, old_dir, req); | |
865 | if (!err && !req->r_reply_info.head->is_dentry) { | |
866 | /* | |
867 | * Normally d_move() is done by fill_trace (called by | |
868 | * do_request, above). If there is no trace, we need | |
869 | * to do it here. | |
870 | */ | |
871 | d_move(old_dentry, new_dentry); | |
872 | } | |
873 | ceph_mdsc_put_request(req); | |
874 | return err; | |
875 | } | |
876 | ||
877 | ||
878 | /* | |
879 | * Check if dentry lease is valid. If not, delete the lease. Try to | |
880 | * renew if the least is more than half up. | |
881 | */ | |
882 | static int dentry_lease_is_valid(struct dentry *dentry) | |
883 | { | |
884 | struct ceph_dentry_info *di; | |
885 | struct ceph_mds_session *s; | |
886 | int valid = 0; | |
887 | u32 gen; | |
888 | unsigned long ttl; | |
889 | struct ceph_mds_session *session = NULL; | |
890 | struct inode *dir = NULL; | |
891 | u32 seq = 0; | |
892 | ||
893 | spin_lock(&dentry->d_lock); | |
894 | di = ceph_dentry(dentry); | |
895 | if (di && di->lease_session) { | |
896 | s = di->lease_session; | |
897 | spin_lock(&s->s_cap_lock); | |
898 | gen = s->s_cap_gen; | |
899 | ttl = s->s_cap_ttl; | |
900 | spin_unlock(&s->s_cap_lock); | |
901 | ||
902 | if (di->lease_gen == gen && | |
903 | time_before(jiffies, dentry->d_time) && | |
904 | time_before(jiffies, ttl)) { | |
905 | valid = 1; | |
906 | if (di->lease_renew_after && | |
907 | time_after(jiffies, di->lease_renew_after)) { | |
908 | /* we should renew */ | |
909 | dir = dentry->d_parent->d_inode; | |
910 | session = ceph_get_mds_session(s); | |
911 | seq = di->lease_seq; | |
912 | di->lease_renew_after = 0; | |
913 | di->lease_renew_from = jiffies; | |
914 | } | |
915 | } else { | |
916 | __ceph_mdsc_drop_dentry_lease(dentry); | |
917 | } | |
918 | } | |
919 | spin_unlock(&dentry->d_lock); | |
920 | ||
921 | if (session) { | |
922 | ceph_mdsc_lease_send_msg(session, dir, dentry, | |
923 | CEPH_MDS_LEASE_RENEW, seq); | |
924 | ceph_put_mds_session(session); | |
925 | } | |
926 | dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid); | |
927 | return valid; | |
928 | } | |
929 | ||
930 | /* | |
931 | * Check if directory-wide content lease/cap is valid. | |
932 | */ | |
933 | static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry) | |
934 | { | |
935 | struct ceph_inode_info *ci = ceph_inode(dir); | |
936 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
937 | int valid = 0; | |
938 | ||
939 | spin_lock(&dir->i_lock); | |
940 | if (ci->i_shared_gen == di->lease_shared_gen) | |
941 | valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1); | |
942 | spin_unlock(&dir->i_lock); | |
943 | dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n", | |
944 | dir, (unsigned)ci->i_shared_gen, dentry, | |
945 | (unsigned)di->lease_shared_gen, valid); | |
946 | return valid; | |
947 | } | |
948 | ||
949 | /* | |
950 | * Check if cached dentry can be trusted. | |
951 | */ | |
952 | static int ceph_d_revalidate(struct dentry *dentry, struct nameidata *nd) | |
953 | { | |
954 | struct inode *dir = dentry->d_parent->d_inode; | |
955 | ||
956 | dout("d_revalidate %p '%.*s' inode %p\n", dentry, | |
957 | dentry->d_name.len, dentry->d_name.name, dentry->d_inode); | |
958 | ||
959 | /* always trust cached snapped dentries, snapdir dentry */ | |
960 | if (ceph_snap(dir) != CEPH_NOSNAP) { | |
961 | dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry, | |
962 | dentry->d_name.len, dentry->d_name.name, dentry->d_inode); | |
963 | goto out_touch; | |
964 | } | |
965 | if (dentry->d_inode && ceph_snap(dentry->d_inode) == CEPH_SNAPDIR) | |
966 | goto out_touch; | |
967 | ||
968 | if (dentry_lease_is_valid(dentry) || | |
969 | dir_lease_is_valid(dir, dentry)) | |
970 | goto out_touch; | |
971 | ||
972 | dout("d_revalidate %p invalid\n", dentry); | |
973 | d_drop(dentry); | |
974 | return 0; | |
975 | out_touch: | |
976 | ceph_dentry_lru_touch(dentry); | |
977 | return 1; | |
978 | } | |
979 | ||
980 | /* | |
981 | * When a dentry is released, clear the dir I_COMPLETE if it was part | |
982 | * of the current dir gen. | |
983 | */ | |
984 | static void ceph_dentry_release(struct dentry *dentry) | |
985 | { | |
986 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
987 | struct inode *parent_inode = dentry->d_parent->d_inode; | |
988 | ||
989 | if (parent_inode) { | |
990 | struct ceph_inode_info *ci = ceph_inode(parent_inode); | |
991 | ||
992 | spin_lock(&parent_inode->i_lock); | |
993 | if (ci->i_shared_gen == di->lease_shared_gen) { | |
994 | dout(" clearing %p complete (d_release)\n", | |
995 | parent_inode); | |
996 | ci->i_ceph_flags &= ~CEPH_I_COMPLETE; | |
997 | ci->i_release_count++; | |
998 | } | |
999 | spin_unlock(&parent_inode->i_lock); | |
1000 | } | |
1001 | if (di) { | |
1002 | ceph_dentry_lru_del(dentry); | |
1003 | if (di->lease_session) | |
1004 | ceph_put_mds_session(di->lease_session); | |
1005 | kmem_cache_free(ceph_dentry_cachep, di); | |
1006 | dentry->d_fsdata = NULL; | |
1007 | } | |
1008 | } | |
1009 | ||
1010 | static int ceph_snapdir_d_revalidate(struct dentry *dentry, | |
1011 | struct nameidata *nd) | |
1012 | { | |
1013 | /* | |
1014 | * Eventually, we'll want to revalidate snapped metadata | |
1015 | * too... probably... | |
1016 | */ | |
1017 | return 1; | |
1018 | } | |
1019 | ||
1020 | ||
1021 | ||
1022 | /* | |
1023 | * read() on a dir. This weird interface hack only works if mounted | |
1024 | * with '-o dirstat'. | |
1025 | */ | |
1026 | static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, | |
1027 | loff_t *ppos) | |
1028 | { | |
1029 | struct ceph_file_info *cf = file->private_data; | |
1030 | struct inode *inode = file->f_dentry->d_inode; | |
1031 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1032 | int left; | |
1033 | ||
1034 | if (!ceph_test_opt(ceph_client(inode->i_sb), DIRSTAT)) | |
1035 | return -EISDIR; | |
1036 | ||
1037 | if (!cf->dir_info) { | |
1038 | cf->dir_info = kmalloc(1024, GFP_NOFS); | |
1039 | if (!cf->dir_info) | |
1040 | return -ENOMEM; | |
1041 | cf->dir_info_len = | |
1042 | sprintf(cf->dir_info, | |
1043 | "entries: %20lld\n" | |
1044 | " files: %20lld\n" | |
1045 | " subdirs: %20lld\n" | |
1046 | "rentries: %20lld\n" | |
1047 | " rfiles: %20lld\n" | |
1048 | " rsubdirs: %20lld\n" | |
1049 | "rbytes: %20lld\n" | |
1050 | "rctime: %10ld.%09ld\n", | |
1051 | ci->i_files + ci->i_subdirs, | |
1052 | ci->i_files, | |
1053 | ci->i_subdirs, | |
1054 | ci->i_rfiles + ci->i_rsubdirs, | |
1055 | ci->i_rfiles, | |
1056 | ci->i_rsubdirs, | |
1057 | ci->i_rbytes, | |
1058 | (long)ci->i_rctime.tv_sec, | |
1059 | (long)ci->i_rctime.tv_nsec); | |
1060 | } | |
1061 | ||
1062 | if (*ppos >= cf->dir_info_len) | |
1063 | return 0; | |
1064 | size = min_t(unsigned, size, cf->dir_info_len-*ppos); | |
1065 | left = copy_to_user(buf, cf->dir_info + *ppos, size); | |
1066 | if (left == size) | |
1067 | return -EFAULT; | |
1068 | *ppos += (size - left); | |
1069 | return size - left; | |
1070 | } | |
1071 | ||
1072 | /* | |
1073 | * an fsync() on a dir will wait for any uncommitted directory | |
1074 | * operations to commit. | |
1075 | */ | |
1076 | static int ceph_dir_fsync(struct file *file, struct dentry *dentry, | |
1077 | int datasync) | |
1078 | { | |
1079 | struct inode *inode = dentry->d_inode; | |
1080 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1081 | struct list_head *head = &ci->i_unsafe_dirops; | |
1082 | struct ceph_mds_request *req; | |
1083 | u64 last_tid; | |
1084 | int ret = 0; | |
1085 | ||
1086 | dout("dir_fsync %p\n", inode); | |
1087 | spin_lock(&ci->i_unsafe_lock); | |
1088 | if (list_empty(head)) | |
1089 | goto out; | |
1090 | ||
1091 | req = list_entry(head->prev, | |
1092 | struct ceph_mds_request, r_unsafe_dir_item); | |
1093 | last_tid = req->r_tid; | |
1094 | ||
1095 | do { | |
1096 | ceph_mdsc_get_request(req); | |
1097 | spin_unlock(&ci->i_unsafe_lock); | |
1098 | dout("dir_fsync %p wait on tid %llu (until %llu)\n", | |
1099 | inode, req->r_tid, last_tid); | |
1100 | if (req->r_timeout) { | |
1101 | ret = wait_for_completion_timeout( | |
1102 | &req->r_safe_completion, req->r_timeout); | |
1103 | if (ret > 0) | |
1104 | ret = 0; | |
1105 | else if (ret == 0) | |
1106 | ret = -EIO; /* timed out */ | |
1107 | } else { | |
1108 | wait_for_completion(&req->r_safe_completion); | |
1109 | } | |
1110 | spin_lock(&ci->i_unsafe_lock); | |
1111 | ceph_mdsc_put_request(req); | |
1112 | ||
1113 | if (ret || list_empty(head)) | |
1114 | break; | |
1115 | req = list_entry(head->next, | |
1116 | struct ceph_mds_request, r_unsafe_dir_item); | |
1117 | } while (req->r_tid < last_tid); | |
1118 | out: | |
1119 | spin_unlock(&ci->i_unsafe_lock); | |
1120 | return ret; | |
1121 | } | |
1122 | ||
1123 | /* | |
1124 | * We maintain a private dentry LRU. | |
1125 | * | |
1126 | * FIXME: this needs to be changed to a per-mds lru to be useful. | |
1127 | */ | |
1128 | void ceph_dentry_lru_add(struct dentry *dn) | |
1129 | { | |
1130 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1131 | struct ceph_mds_client *mdsc; | |
1132 | dout("dentry_lru_add %p %p\t%.*s\n", | |
1133 | di, dn, dn->d_name.len, dn->d_name.name); | |
1134 | ||
1135 | if (di) { | |
1136 | mdsc = &ceph_client(dn->d_sb)->mdsc; | |
1137 | spin_lock(&mdsc->dentry_lru_lock); | |
1138 | list_add_tail(&di->lru, &mdsc->dentry_lru); | |
1139 | mdsc->num_dentry++; | |
1140 | spin_unlock(&mdsc->dentry_lru_lock); | |
1141 | } | |
1142 | } | |
1143 | ||
1144 | void ceph_dentry_lru_touch(struct dentry *dn) | |
1145 | { | |
1146 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1147 | struct ceph_mds_client *mdsc; | |
1148 | dout("dentry_lru_touch %p %p\t%.*s\n", | |
1149 | di, dn, dn->d_name.len, dn->d_name.name); | |
1150 | ||
1151 | if (di) { | |
1152 | mdsc = &ceph_client(dn->d_sb)->mdsc; | |
1153 | spin_lock(&mdsc->dentry_lru_lock); | |
1154 | list_move_tail(&di->lru, &mdsc->dentry_lru); | |
1155 | spin_unlock(&mdsc->dentry_lru_lock); | |
1156 | } | |
1157 | } | |
1158 | ||
1159 | void ceph_dentry_lru_del(struct dentry *dn) | |
1160 | { | |
1161 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1162 | struct ceph_mds_client *mdsc; | |
1163 | ||
1164 | dout("dentry_lru_del %p %p\t%.*s\n", | |
1165 | di, dn, dn->d_name.len, dn->d_name.name); | |
1166 | if (di) { | |
1167 | mdsc = &ceph_client(dn->d_sb)->mdsc; | |
1168 | spin_lock(&mdsc->dentry_lru_lock); | |
1169 | list_del_init(&di->lru); | |
1170 | mdsc->num_dentry--; | |
1171 | spin_unlock(&mdsc->dentry_lru_lock); | |
1172 | } | |
1173 | } | |
1174 | ||
1175 | const struct file_operations ceph_dir_fops = { | |
1176 | .read = ceph_read_dir, | |
1177 | .readdir = ceph_readdir, | |
1178 | .llseek = ceph_dir_llseek, | |
1179 | .open = ceph_open, | |
1180 | .release = ceph_release, | |
1181 | .unlocked_ioctl = ceph_ioctl, | |
1182 | .fsync = ceph_dir_fsync, | |
1183 | }; | |
1184 | ||
1185 | const struct inode_operations ceph_dir_iops = { | |
1186 | .lookup = ceph_lookup, | |
1187 | .permission = ceph_permission, | |
1188 | .getattr = ceph_getattr, | |
1189 | .setattr = ceph_setattr, | |
1190 | .setxattr = ceph_setxattr, | |
1191 | .getxattr = ceph_getxattr, | |
1192 | .listxattr = ceph_listxattr, | |
1193 | .removexattr = ceph_removexattr, | |
1194 | .mknod = ceph_mknod, | |
1195 | .symlink = ceph_symlink, | |
1196 | .mkdir = ceph_mkdir, | |
1197 | .link = ceph_link, | |
1198 | .unlink = ceph_unlink, | |
1199 | .rmdir = ceph_unlink, | |
1200 | .rename = ceph_rename, | |
1201 | .create = ceph_create, | |
1202 | }; | |
1203 | ||
1204 | struct dentry_operations ceph_dentry_ops = { | |
1205 | .d_revalidate = ceph_d_revalidate, | |
1206 | .d_release = ceph_dentry_release, | |
1207 | }; | |
1208 | ||
1209 | struct dentry_operations ceph_snapdir_dentry_ops = { | |
1210 | .d_revalidate = ceph_snapdir_d_revalidate, | |
1211 | }; | |
1212 | ||
1213 | struct dentry_operations ceph_snap_dentry_ops = { | |
1214 | }; |