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 && | |
09b8a7d2 | 134 | ceph_snap(dentry->d_inode) != CEPH_SNAPDIR && |
1d1de916 | 135 | ceph_ino(dentry->d_inode) != CEPH_INO_CEPH && |
2817b000 SW |
136 | filp->f_pos <= di->offset) |
137 | break; | |
138 | dout(" skipping %p %.*s at %llu (%llu)%s%s\n", dentry, | |
139 | dentry->d_name.len, dentry->d_name.name, di->offset, | |
140 | filp->f_pos, d_unhashed(dentry) ? " unhashed" : "", | |
141 | !dentry->d_inode ? " null" : ""); | |
142 | p = p->prev; | |
143 | dentry = list_entry(p, struct dentry, d_u.d_child); | |
144 | di = ceph_dentry(dentry); | |
145 | } | |
146 | ||
147 | atomic_inc(&dentry->d_count); | |
148 | spin_unlock(&dcache_lock); | |
149 | spin_unlock(&inode->i_lock); | |
150 | ||
151 | dout(" %llu (%llu) dentry %p %.*s %p\n", di->offset, filp->f_pos, | |
152 | dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode); | |
153 | filp->f_pos = di->offset; | |
154 | err = filldir(dirent, dentry->d_name.name, | |
155 | dentry->d_name.len, di->offset, | |
156 | dentry->d_inode->i_ino, | |
157 | dentry->d_inode->i_mode >> 12); | |
158 | ||
159 | if (last) { | |
160 | if (err < 0) { | |
161 | /* remember our position */ | |
162 | fi->dentry = last; | |
163 | fi->next_offset = di->offset; | |
164 | } else { | |
165 | dput(last); | |
166 | } | |
167 | last = NULL; | |
168 | } | |
169 | ||
170 | spin_lock(&inode->i_lock); | |
171 | spin_lock(&dcache_lock); | |
172 | ||
173 | if (err < 0) | |
174 | goto out_unlock; | |
175 | ||
176 | last = dentry; | |
177 | ||
178 | p = p->prev; | |
179 | filp->f_pos++; | |
180 | ||
181 | /* make sure a dentry wasn't dropped while we didn't have dcache_lock */ | |
182 | if ((ceph_inode(dir)->i_ceph_flags & CEPH_I_COMPLETE)) | |
183 | goto more; | |
184 | dout(" lost I_COMPLETE on %p; falling back to mds\n", dir); | |
185 | err = -EAGAIN; | |
186 | ||
187 | out_unlock: | |
188 | spin_unlock(&dcache_lock); | |
189 | ||
190 | if (last) { | |
191 | spin_unlock(&inode->i_lock); | |
192 | dput(last); | |
193 | spin_lock(&inode->i_lock); | |
194 | } | |
195 | ||
196 | return err; | |
197 | } | |
198 | ||
199 | /* | |
200 | * make note of the last dentry we read, so we can | |
201 | * continue at the same lexicographical point, | |
202 | * regardless of what dir changes take place on the | |
203 | * server. | |
204 | */ | |
205 | static int note_last_dentry(struct ceph_file_info *fi, const char *name, | |
206 | int len) | |
207 | { | |
208 | kfree(fi->last_name); | |
209 | fi->last_name = kmalloc(len+1, GFP_NOFS); | |
210 | if (!fi->last_name) | |
211 | return -ENOMEM; | |
212 | memcpy(fi->last_name, name, len); | |
213 | fi->last_name[len] = 0; | |
214 | dout("note_last_dentry '%s'\n", fi->last_name); | |
215 | return 0; | |
216 | } | |
217 | ||
218 | static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
219 | { | |
220 | struct ceph_file_info *fi = filp->private_data; | |
221 | struct inode *inode = filp->f_dentry->d_inode; | |
222 | struct ceph_inode_info *ci = ceph_inode(inode); | |
223 | struct ceph_client *client = ceph_inode_to_client(inode); | |
224 | struct ceph_mds_client *mdsc = &client->mdsc; | |
225 | unsigned frag = fpos_frag(filp->f_pos); | |
226 | int off = fpos_off(filp->f_pos); | |
227 | int err; | |
228 | u32 ftype; | |
229 | struct ceph_mds_reply_info_parsed *rinfo; | |
6b805185 | 230 | const int max_entries = client->mount_args->max_readdir; |
2817b000 SW |
231 | |
232 | dout("readdir %p filp %p frag %u off %u\n", inode, filp, frag, off); | |
233 | if (fi->at_end) | |
234 | return 0; | |
235 | ||
236 | /* always start with . and .. */ | |
237 | if (filp->f_pos == 0) { | |
238 | /* note dir version at start of readdir so we can tell | |
239 | * if any dentries get dropped */ | |
240 | fi->dir_release_count = ci->i_release_count; | |
241 | ||
242 | dout("readdir off 0 -> '.'\n"); | |
243 | if (filldir(dirent, ".", 1, ceph_make_fpos(0, 0), | |
244 | inode->i_ino, inode->i_mode >> 12) < 0) | |
245 | return 0; | |
246 | filp->f_pos = 1; | |
247 | off = 1; | |
248 | } | |
249 | if (filp->f_pos == 1) { | |
250 | dout("readdir off 1 -> '..'\n"); | |
251 | if (filldir(dirent, "..", 2, ceph_make_fpos(0, 1), | |
252 | filp->f_dentry->d_parent->d_inode->i_ino, | |
253 | inode->i_mode >> 12) < 0) | |
254 | return 0; | |
255 | filp->f_pos = 2; | |
256 | off = 2; | |
257 | } | |
258 | ||
259 | /* can we use the dcache? */ | |
260 | spin_lock(&inode->i_lock); | |
261 | if ((filp->f_pos == 2 || fi->dentry) && | |
262 | !ceph_test_opt(client, NOASYNCREADDIR) && | |
263 | (ci->i_ceph_flags & CEPH_I_COMPLETE) && | |
264 | __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) { | |
265 | err = __dcache_readdir(filp, dirent, filldir); | |
266 | if (err != -EAGAIN) { | |
267 | spin_unlock(&inode->i_lock); | |
268 | return err; | |
269 | } | |
270 | } | |
271 | spin_unlock(&inode->i_lock); | |
272 | if (fi->dentry) { | |
273 | err = note_last_dentry(fi, fi->dentry->d_name.name, | |
274 | fi->dentry->d_name.len); | |
275 | if (err) | |
276 | return err; | |
277 | dput(fi->dentry); | |
278 | fi->dentry = NULL; | |
279 | } | |
280 | ||
281 | /* proceed with a normal readdir */ | |
282 | ||
283 | more: | |
284 | /* do we have the correct frag content buffered? */ | |
285 | if (fi->frag != frag || fi->last_readdir == NULL) { | |
286 | struct ceph_mds_request *req; | |
287 | int op = ceph_snap(inode) == CEPH_SNAPDIR ? | |
288 | CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR; | |
289 | ||
290 | /* discard old result, if any */ | |
291 | if (fi->last_readdir) | |
292 | ceph_mdsc_put_request(fi->last_readdir); | |
293 | ||
294 | /* requery frag tree, as the frag topology may have changed */ | |
295 | frag = ceph_choose_frag(ceph_inode(inode), frag, NULL, NULL); | |
296 | ||
297 | dout("readdir fetching %llx.%llx frag %x offset '%s'\n", | |
298 | ceph_vinop(inode), frag, fi->last_name); | |
299 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
300 | if (IS_ERR(req)) | |
301 | return PTR_ERR(req); | |
302 | req->r_inode = igrab(inode); | |
303 | req->r_dentry = dget(filp->f_dentry); | |
304 | /* hints to request -> mds selection code */ | |
305 | req->r_direct_mode = USE_AUTH_MDS; | |
306 | req->r_direct_hash = ceph_frag_value(frag); | |
307 | req->r_direct_is_hash = true; | |
308 | req->r_path2 = kstrdup(fi->last_name, GFP_NOFS); | |
309 | req->r_readdir_offset = fi->next_offset; | |
310 | req->r_args.readdir.frag = cpu_to_le32(frag); | |
311 | req->r_args.readdir.max_entries = cpu_to_le32(max_entries); | |
312 | req->r_num_caps = max_entries; | |
313 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
314 | if (err < 0) { | |
315 | ceph_mdsc_put_request(req); | |
316 | return err; | |
317 | } | |
318 | dout("readdir got and parsed readdir result=%d" | |
319 | " on frag %x, end=%d, complete=%d\n", err, frag, | |
320 | (int)req->r_reply_info.dir_end, | |
321 | (int)req->r_reply_info.dir_complete); | |
322 | ||
323 | if (!req->r_did_prepopulate) { | |
324 | dout("readdir !did_prepopulate"); | |
325 | fi->dir_release_count--; /* preclude I_COMPLETE */ | |
326 | } | |
327 | ||
328 | /* note next offset and last dentry name */ | |
329 | fi->offset = fi->next_offset; | |
330 | fi->last_readdir = req; | |
331 | ||
332 | if (req->r_reply_info.dir_end) { | |
333 | kfree(fi->last_name); | |
334 | fi->last_name = NULL; | |
335 | fi->next_offset = 0; | |
336 | } else { | |
337 | rinfo = &req->r_reply_info; | |
338 | err = note_last_dentry(fi, | |
339 | rinfo->dir_dname[rinfo->dir_nr-1], | |
340 | rinfo->dir_dname_len[rinfo->dir_nr-1]); | |
341 | if (err) | |
342 | return err; | |
343 | fi->next_offset += rinfo->dir_nr; | |
344 | } | |
345 | } | |
346 | ||
347 | rinfo = &fi->last_readdir->r_reply_info; | |
348 | dout("readdir frag %x num %d off %d chunkoff %d\n", frag, | |
349 | rinfo->dir_nr, off, fi->offset); | |
350 | while (off - fi->offset >= 0 && off - fi->offset < rinfo->dir_nr) { | |
351 | u64 pos = ceph_make_fpos(frag, off); | |
352 | struct ceph_mds_reply_inode *in = | |
353 | rinfo->dir_in[off - fi->offset].in; | |
354 | dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n", | |
355 | off, off - fi->offset, rinfo->dir_nr, pos, | |
356 | rinfo->dir_dname_len[off - fi->offset], | |
357 | rinfo->dir_dname[off - fi->offset], in); | |
358 | BUG_ON(!in); | |
359 | ftype = le32_to_cpu(in->mode) >> 12; | |
360 | if (filldir(dirent, | |
361 | rinfo->dir_dname[off - fi->offset], | |
362 | rinfo->dir_dname_len[off - fi->offset], | |
363 | pos, | |
364 | le64_to_cpu(in->ino), | |
365 | ftype) < 0) { | |
366 | dout("filldir stopping us...\n"); | |
367 | return 0; | |
368 | } | |
369 | off++; | |
370 | filp->f_pos = pos + 1; | |
371 | } | |
372 | ||
373 | if (fi->last_name) { | |
374 | ceph_mdsc_put_request(fi->last_readdir); | |
375 | fi->last_readdir = NULL; | |
376 | goto more; | |
377 | } | |
378 | ||
379 | /* more frags? */ | |
380 | if (!ceph_frag_is_rightmost(frag)) { | |
381 | frag = ceph_frag_next(frag); | |
382 | off = 0; | |
383 | filp->f_pos = ceph_make_fpos(frag, off); | |
384 | dout("readdir next frag is %x\n", frag); | |
385 | goto more; | |
386 | } | |
387 | fi->at_end = 1; | |
388 | ||
389 | /* | |
390 | * if dir_release_count still matches the dir, no dentries | |
391 | * were released during the whole readdir, and we should have | |
392 | * the complete dir contents in our cache. | |
393 | */ | |
394 | spin_lock(&inode->i_lock); | |
395 | if (ci->i_release_count == fi->dir_release_count) { | |
396 | dout(" marking %p complete\n", inode); | |
397 | ci->i_ceph_flags |= CEPH_I_COMPLETE; | |
398 | ci->i_max_offset = filp->f_pos; | |
399 | } | |
400 | spin_unlock(&inode->i_lock); | |
401 | ||
402 | dout("readdir %p filp %p done.\n", inode, filp); | |
403 | return 0; | |
404 | } | |
405 | ||
406 | static void reset_readdir(struct ceph_file_info *fi) | |
407 | { | |
408 | if (fi->last_readdir) { | |
409 | ceph_mdsc_put_request(fi->last_readdir); | |
410 | fi->last_readdir = NULL; | |
411 | } | |
412 | kfree(fi->last_name); | |
413 | fi->next_offset = 2; /* compensate for . and .. */ | |
414 | if (fi->dentry) { | |
415 | dput(fi->dentry); | |
416 | fi->dentry = NULL; | |
417 | } | |
418 | fi->at_end = 0; | |
419 | } | |
420 | ||
421 | static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int origin) | |
422 | { | |
423 | struct ceph_file_info *fi = file->private_data; | |
424 | struct inode *inode = file->f_mapping->host; | |
425 | loff_t old_offset = offset; | |
426 | loff_t retval; | |
427 | ||
428 | mutex_lock(&inode->i_mutex); | |
429 | switch (origin) { | |
430 | case SEEK_END: | |
431 | offset += inode->i_size + 2; /* FIXME */ | |
432 | break; | |
433 | case SEEK_CUR: | |
434 | offset += file->f_pos; | |
435 | } | |
436 | retval = -EINVAL; | |
437 | if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) { | |
438 | if (offset != file->f_pos) { | |
439 | file->f_pos = offset; | |
440 | file->f_version = 0; | |
441 | fi->at_end = 0; | |
442 | } | |
443 | retval = offset; | |
444 | ||
445 | /* | |
446 | * discard buffered readdir content on seekdir(0), or | |
447 | * seek to new frag, or seek prior to current chunk. | |
448 | */ | |
449 | if (offset == 0 || | |
450 | fpos_frag(offset) != fpos_frag(old_offset) || | |
451 | fpos_off(offset) < fi->offset) { | |
452 | dout("dir_llseek dropping %p content\n", file); | |
453 | reset_readdir(fi); | |
454 | } | |
455 | ||
456 | /* bump dir_release_count if we did a forward seek */ | |
457 | if (offset > old_offset) | |
458 | fi->dir_release_count--; | |
459 | } | |
460 | mutex_unlock(&inode->i_mutex); | |
461 | return retval; | |
462 | } | |
463 | ||
464 | /* | |
465 | * Process result of a lookup/open request. | |
466 | * | |
467 | * Mainly, make sure we return the final req->r_dentry (if it already | |
468 | * existed) in place of the original VFS-provided dentry when they | |
469 | * differ. | |
470 | * | |
471 | * Gracefully handle the case where the MDS replies with -ENOENT and | |
472 | * no trace (which it may do, at its discretion, e.g., if it doesn't | |
473 | * care to issue a lease on the negative dentry). | |
474 | */ | |
475 | struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, | |
476 | struct dentry *dentry, int err) | |
477 | { | |
478 | struct ceph_client *client = ceph_client(dentry->d_sb); | |
479 | struct inode *parent = dentry->d_parent->d_inode; | |
480 | ||
481 | /* .snap dir? */ | |
482 | if (err == -ENOENT && | |
483 | ceph_vino(parent).ino != CEPH_INO_ROOT && /* no .snap in root dir */ | |
6b805185 SW |
484 | strcmp(dentry->d_name.name, |
485 | client->mount_args->snapdir_name) == 0) { | |
2817b000 SW |
486 | struct inode *inode = ceph_get_snapdir(parent); |
487 | dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p\n", | |
488 | dentry, dentry->d_name.len, dentry->d_name.name, inode); | |
489 | d_add(dentry, inode); | |
490 | err = 0; | |
491 | } | |
492 | ||
493 | if (err == -ENOENT) { | |
494 | /* no trace? */ | |
495 | err = 0; | |
496 | if (!req->r_reply_info.head->is_dentry) { | |
497 | dout("ENOENT and no trace, dentry %p inode %p\n", | |
498 | dentry, dentry->d_inode); | |
499 | if (dentry->d_inode) { | |
500 | d_drop(dentry); | |
501 | err = -ENOENT; | |
502 | } else { | |
503 | d_add(dentry, NULL); | |
504 | } | |
505 | } | |
506 | } | |
507 | if (err) | |
508 | dentry = ERR_PTR(err); | |
509 | else if (dentry != req->r_dentry) | |
510 | dentry = dget(req->r_dentry); /* we got spliced */ | |
511 | else | |
512 | dentry = NULL; | |
513 | return dentry; | |
514 | } | |
515 | ||
1d1de916 SW |
516 | static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry) |
517 | { | |
518 | return ceph_ino(inode) == CEPH_INO_ROOT && | |
519 | strncmp(dentry->d_name.name, ".ceph", 5) == 0; | |
520 | } | |
521 | ||
2817b000 SW |
522 | /* |
523 | * Look up a single dir entry. If there is a lookup intent, inform | |
524 | * the MDS so that it gets our 'caps wanted' value in a single op. | |
525 | */ | |
526 | static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry, | |
527 | struct nameidata *nd) | |
528 | { | |
529 | struct ceph_client *client = ceph_sb_to_client(dir->i_sb); | |
530 | struct ceph_mds_client *mdsc = &client->mdsc; | |
531 | struct ceph_mds_request *req; | |
532 | int op; | |
533 | int err; | |
534 | ||
535 | dout("lookup %p dentry %p '%.*s'\n", | |
536 | dir, dentry, dentry->d_name.len, dentry->d_name.name); | |
537 | ||
538 | if (dentry->d_name.len > NAME_MAX) | |
539 | return ERR_PTR(-ENAMETOOLONG); | |
540 | ||
541 | err = ceph_init_dentry(dentry); | |
542 | if (err < 0) | |
543 | return ERR_PTR(err); | |
544 | ||
545 | /* open (but not create!) intent? */ | |
546 | if (nd && | |
547 | (nd->flags & LOOKUP_OPEN) && | |
548 | (nd->flags & LOOKUP_CONTINUE) == 0 && /* only open last component */ | |
549 | !(nd->intent.open.flags & O_CREAT)) { | |
550 | int mode = nd->intent.open.create_mode & ~current->fs->umask; | |
551 | return ceph_lookup_open(dir, dentry, nd, mode, 1); | |
552 | } | |
553 | ||
554 | /* can we conclude ENOENT locally? */ | |
555 | if (dentry->d_inode == NULL) { | |
556 | struct ceph_inode_info *ci = ceph_inode(dir); | |
557 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
558 | ||
559 | spin_lock(&dir->i_lock); | |
560 | dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags); | |
561 | if (strncmp(dentry->d_name.name, | |
6b805185 | 562 | client->mount_args->snapdir_name, |
2817b000 | 563 | dentry->d_name.len) && |
1d1de916 | 564 | !is_root_ceph_dentry(dir, dentry) && |
2817b000 SW |
565 | (ci->i_ceph_flags & CEPH_I_COMPLETE) && |
566 | (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) { | |
567 | di->offset = ci->i_max_offset++; | |
568 | spin_unlock(&dir->i_lock); | |
569 | dout(" dir %p complete, -ENOENT\n", dir); | |
570 | d_add(dentry, NULL); | |
571 | di->lease_shared_gen = ci->i_shared_gen; | |
572 | return NULL; | |
573 | } | |
574 | spin_unlock(&dir->i_lock); | |
575 | } | |
576 | ||
577 | op = ceph_snap(dir) == CEPH_SNAPDIR ? | |
578 | CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; | |
579 | req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); | |
580 | if (IS_ERR(req)) | |
581 | return ERR_PTR(PTR_ERR(req)); | |
582 | req->r_dentry = dget(dentry); | |
583 | req->r_num_caps = 2; | |
584 | /* we only need inode linkage */ | |
585 | req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); | |
586 | req->r_locked_dir = dir; | |
587 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
588 | dentry = ceph_finish_lookup(req, dentry, err); | |
589 | ceph_mdsc_put_request(req); /* will dput(dentry) */ | |
590 | dout("lookup result=%p\n", dentry); | |
591 | return dentry; | |
592 | } | |
593 | ||
594 | /* | |
595 | * If we do a create but get no trace back from the MDS, follow up with | |
596 | * a lookup (the VFS expects us to link up the provided dentry). | |
597 | */ | |
598 | int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry) | |
599 | { | |
600 | struct dentry *result = ceph_lookup(dir, dentry, NULL); | |
601 | ||
602 | if (result && !IS_ERR(result)) { | |
603 | /* | |
604 | * We created the item, then did a lookup, and found | |
605 | * it was already linked to another inode we already | |
606 | * had in our cache (and thus got spliced). Link our | |
607 | * dentry to that inode, but don't hash it, just in | |
608 | * case the VFS wants to dereference it. | |
609 | */ | |
610 | BUG_ON(!result->d_inode); | |
611 | d_instantiate(dentry, result->d_inode); | |
612 | return 0; | |
613 | } | |
614 | return PTR_ERR(result); | |
615 | } | |
616 | ||
617 | static int ceph_mknod(struct inode *dir, struct dentry *dentry, | |
618 | int mode, dev_t rdev) | |
619 | { | |
620 | struct ceph_client *client = ceph_sb_to_client(dir->i_sb); | |
621 | struct ceph_mds_client *mdsc = &client->mdsc; | |
622 | struct ceph_mds_request *req; | |
623 | int err; | |
624 | ||
625 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
626 | return -EROFS; | |
627 | ||
628 | dout("mknod in dir %p dentry %p mode 0%o rdev %d\n", | |
629 | dir, dentry, mode, rdev); | |
630 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS); | |
631 | if (IS_ERR(req)) { | |
632 | d_drop(dentry); | |
633 | return PTR_ERR(req); | |
634 | } | |
635 | req->r_dentry = dget(dentry); | |
636 | req->r_num_caps = 2; | |
637 | req->r_locked_dir = dir; | |
638 | req->r_args.mknod.mode = cpu_to_le32(mode); | |
639 | req->r_args.mknod.rdev = cpu_to_le32(rdev); | |
640 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
641 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
642 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
643 | if (!err && !req->r_reply_info.head->is_dentry) | |
644 | err = ceph_handle_notrace_create(dir, dentry); | |
645 | ceph_mdsc_put_request(req); | |
646 | if (err) | |
647 | d_drop(dentry); | |
648 | return err; | |
649 | } | |
650 | ||
651 | static int ceph_create(struct inode *dir, struct dentry *dentry, int mode, | |
652 | struct nameidata *nd) | |
653 | { | |
654 | dout("create in dir %p dentry %p name '%.*s'\n", | |
655 | dir, dentry, dentry->d_name.len, dentry->d_name.name); | |
656 | ||
657 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
658 | return -EROFS; | |
659 | ||
660 | if (nd) { | |
661 | BUG_ON((nd->flags & LOOKUP_OPEN) == 0); | |
662 | dentry = ceph_lookup_open(dir, dentry, nd, mode, 0); | |
663 | /* hrm, what should i do here if we get aliased? */ | |
664 | if (IS_ERR(dentry)) | |
665 | return PTR_ERR(dentry); | |
666 | return 0; | |
667 | } | |
668 | ||
669 | /* fall back to mknod */ | |
670 | return ceph_mknod(dir, dentry, (mode & ~S_IFMT) | S_IFREG, 0); | |
671 | } | |
672 | ||
673 | static int ceph_symlink(struct inode *dir, struct dentry *dentry, | |
674 | const char *dest) | |
675 | { | |
676 | struct ceph_client *client = ceph_sb_to_client(dir->i_sb); | |
677 | struct ceph_mds_client *mdsc = &client->mdsc; | |
678 | struct ceph_mds_request *req; | |
679 | int err; | |
680 | ||
681 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
682 | return -EROFS; | |
683 | ||
684 | dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest); | |
685 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS); | |
686 | if (IS_ERR(req)) { | |
687 | d_drop(dentry); | |
688 | return PTR_ERR(req); | |
689 | } | |
690 | req->r_dentry = dget(dentry); | |
691 | req->r_num_caps = 2; | |
692 | req->r_path2 = kstrdup(dest, GFP_NOFS); | |
693 | req->r_locked_dir = dir; | |
694 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
695 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
696 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
697 | if (!err && !req->r_reply_info.head->is_dentry) | |
698 | err = ceph_handle_notrace_create(dir, dentry); | |
699 | ceph_mdsc_put_request(req); | |
700 | if (err) | |
701 | d_drop(dentry); | |
702 | return err; | |
703 | } | |
704 | ||
705 | static int ceph_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
706 | { | |
707 | struct ceph_client *client = ceph_sb_to_client(dir->i_sb); | |
708 | struct ceph_mds_client *mdsc = &client->mdsc; | |
709 | struct ceph_mds_request *req; | |
710 | int err = -EROFS; | |
711 | int op; | |
712 | ||
713 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
714 | /* mkdir .snap/foo is a MKSNAP */ | |
715 | op = CEPH_MDS_OP_MKSNAP; | |
716 | dout("mksnap dir %p snap '%.*s' dn %p\n", dir, | |
717 | dentry->d_name.len, dentry->d_name.name, dentry); | |
718 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { | |
719 | dout("mkdir dir %p dn %p mode 0%o\n", dir, dentry, mode); | |
720 | op = CEPH_MDS_OP_MKDIR; | |
721 | } else { | |
722 | goto out; | |
723 | } | |
724 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
725 | if (IS_ERR(req)) { | |
726 | err = PTR_ERR(req); | |
727 | goto out; | |
728 | } | |
729 | ||
730 | req->r_dentry = dget(dentry); | |
731 | req->r_num_caps = 2; | |
732 | req->r_locked_dir = dir; | |
733 | req->r_args.mkdir.mode = cpu_to_le32(mode); | |
734 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
735 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
736 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
737 | if (!err && !req->r_reply_info.head->is_dentry) | |
738 | err = ceph_handle_notrace_create(dir, dentry); | |
739 | ceph_mdsc_put_request(req); | |
740 | out: | |
741 | if (err < 0) | |
742 | d_drop(dentry); | |
743 | return err; | |
744 | } | |
745 | ||
746 | static int ceph_link(struct dentry *old_dentry, struct inode *dir, | |
747 | struct dentry *dentry) | |
748 | { | |
749 | struct ceph_client *client = ceph_sb_to_client(dir->i_sb); | |
750 | struct ceph_mds_client *mdsc = &client->mdsc; | |
751 | struct ceph_mds_request *req; | |
752 | int err; | |
753 | ||
754 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
755 | return -EROFS; | |
756 | ||
757 | dout("link in dir %p old_dentry %p dentry %p\n", dir, | |
758 | old_dentry, dentry); | |
759 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS); | |
760 | if (IS_ERR(req)) { | |
761 | d_drop(dentry); | |
762 | return PTR_ERR(req); | |
763 | } | |
764 | req->r_dentry = dget(dentry); | |
765 | req->r_num_caps = 2; | |
766 | req->r_old_dentry = dget(old_dentry); /* or inode? hrm. */ | |
767 | req->r_locked_dir = dir; | |
768 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
769 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
770 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
771 | if (err) | |
772 | d_drop(dentry); | |
773 | else if (!req->r_reply_info.head->is_dentry) | |
774 | d_instantiate(dentry, igrab(old_dentry->d_inode)); | |
775 | ceph_mdsc_put_request(req); | |
776 | return err; | |
777 | } | |
778 | ||
779 | /* | |
780 | * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it | |
781 | * looks like the link count will hit 0, drop any other caps (other | |
782 | * than PIN) we don't specifically want (due to the file still being | |
783 | * open). | |
784 | */ | |
785 | static int drop_caps_for_unlink(struct inode *inode) | |
786 | { | |
787 | struct ceph_inode_info *ci = ceph_inode(inode); | |
788 | int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; | |
789 | ||
790 | spin_lock(&inode->i_lock); | |
791 | if (inode->i_nlink == 1) { | |
792 | drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN); | |
793 | ci->i_ceph_flags |= CEPH_I_NODELAY; | |
794 | } | |
795 | spin_unlock(&inode->i_lock); | |
796 | return drop; | |
797 | } | |
798 | ||
799 | /* | |
800 | * rmdir and unlink are differ only by the metadata op code | |
801 | */ | |
802 | static int ceph_unlink(struct inode *dir, struct dentry *dentry) | |
803 | { | |
804 | struct ceph_client *client = ceph_sb_to_client(dir->i_sb); | |
805 | struct ceph_mds_client *mdsc = &client->mdsc; | |
806 | struct inode *inode = dentry->d_inode; | |
807 | struct ceph_mds_request *req; | |
808 | int err = -EROFS; | |
809 | int op; | |
810 | ||
811 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
812 | /* rmdir .snap/foo is RMSNAP */ | |
813 | dout("rmsnap dir %p '%.*s' dn %p\n", dir, dentry->d_name.len, | |
814 | dentry->d_name.name, dentry); | |
815 | op = CEPH_MDS_OP_RMSNAP; | |
816 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { | |
817 | dout("unlink/rmdir dir %p dn %p inode %p\n", | |
818 | dir, dentry, inode); | |
819 | op = ((dentry->d_inode->i_mode & S_IFMT) == S_IFDIR) ? | |
820 | CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK; | |
821 | } else | |
822 | goto out; | |
823 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
824 | if (IS_ERR(req)) { | |
825 | err = PTR_ERR(req); | |
826 | goto out; | |
827 | } | |
828 | req->r_dentry = dget(dentry); | |
829 | req->r_num_caps = 2; | |
830 | req->r_locked_dir = dir; | |
831 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
832 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
833 | req->r_inode_drop = drop_caps_for_unlink(inode); | |
834 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
835 | if (!err && !req->r_reply_info.head->is_dentry) | |
836 | d_delete(dentry); | |
837 | ceph_mdsc_put_request(req); | |
838 | out: | |
839 | return err; | |
840 | } | |
841 | ||
842 | static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry, | |
843 | struct inode *new_dir, struct dentry *new_dentry) | |
844 | { | |
845 | struct ceph_client *client = ceph_sb_to_client(old_dir->i_sb); | |
846 | struct ceph_mds_client *mdsc = &client->mdsc; | |
847 | struct ceph_mds_request *req; | |
848 | int err; | |
849 | ||
850 | if (ceph_snap(old_dir) != ceph_snap(new_dir)) | |
851 | return -EXDEV; | |
852 | if (ceph_snap(old_dir) != CEPH_NOSNAP || | |
853 | ceph_snap(new_dir) != CEPH_NOSNAP) | |
854 | return -EROFS; | |
855 | dout("rename dir %p dentry %p to dir %p dentry %p\n", | |
856 | old_dir, old_dentry, new_dir, new_dentry); | |
857 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RENAME, USE_AUTH_MDS); | |
858 | if (IS_ERR(req)) | |
859 | return PTR_ERR(req); | |
860 | req->r_dentry = dget(new_dentry); | |
861 | req->r_num_caps = 2; | |
862 | req->r_old_dentry = dget(old_dentry); | |
863 | req->r_locked_dir = new_dir; | |
864 | req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED; | |
865 | req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL; | |
866 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
867 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
868 | /* release LINK_RDCACHE on source inode (mds will lock it) */ | |
869 | req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; | |
870 | if (new_dentry->d_inode) | |
871 | req->r_inode_drop = drop_caps_for_unlink(new_dentry->d_inode); | |
872 | err = ceph_mdsc_do_request(mdsc, old_dir, req); | |
873 | if (!err && !req->r_reply_info.head->is_dentry) { | |
874 | /* | |
875 | * Normally d_move() is done by fill_trace (called by | |
876 | * do_request, above). If there is no trace, we need | |
877 | * to do it here. | |
878 | */ | |
879 | d_move(old_dentry, new_dentry); | |
880 | } | |
881 | ceph_mdsc_put_request(req); | |
882 | return err; | |
883 | } | |
884 | ||
885 | ||
886 | /* | |
887 | * Check if dentry lease is valid. If not, delete the lease. Try to | |
888 | * renew if the least is more than half up. | |
889 | */ | |
890 | static int dentry_lease_is_valid(struct dentry *dentry) | |
891 | { | |
892 | struct ceph_dentry_info *di; | |
893 | struct ceph_mds_session *s; | |
894 | int valid = 0; | |
895 | u32 gen; | |
896 | unsigned long ttl; | |
897 | struct ceph_mds_session *session = NULL; | |
898 | struct inode *dir = NULL; | |
899 | u32 seq = 0; | |
900 | ||
901 | spin_lock(&dentry->d_lock); | |
902 | di = ceph_dentry(dentry); | |
903 | if (di && di->lease_session) { | |
904 | s = di->lease_session; | |
905 | spin_lock(&s->s_cap_lock); | |
906 | gen = s->s_cap_gen; | |
907 | ttl = s->s_cap_ttl; | |
908 | spin_unlock(&s->s_cap_lock); | |
909 | ||
910 | if (di->lease_gen == gen && | |
911 | time_before(jiffies, dentry->d_time) && | |
912 | time_before(jiffies, ttl)) { | |
913 | valid = 1; | |
914 | if (di->lease_renew_after && | |
915 | time_after(jiffies, di->lease_renew_after)) { | |
916 | /* we should renew */ | |
917 | dir = dentry->d_parent->d_inode; | |
918 | session = ceph_get_mds_session(s); | |
919 | seq = di->lease_seq; | |
920 | di->lease_renew_after = 0; | |
921 | di->lease_renew_from = jiffies; | |
922 | } | |
2817b000 SW |
923 | } |
924 | } | |
925 | spin_unlock(&dentry->d_lock); | |
926 | ||
927 | if (session) { | |
928 | ceph_mdsc_lease_send_msg(session, dir, dentry, | |
929 | CEPH_MDS_LEASE_RENEW, seq); | |
930 | ceph_put_mds_session(session); | |
931 | } | |
932 | dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid); | |
933 | return valid; | |
934 | } | |
935 | ||
936 | /* | |
937 | * Check if directory-wide content lease/cap is valid. | |
938 | */ | |
939 | static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry) | |
940 | { | |
941 | struct ceph_inode_info *ci = ceph_inode(dir); | |
942 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
943 | int valid = 0; | |
944 | ||
945 | spin_lock(&dir->i_lock); | |
946 | if (ci->i_shared_gen == di->lease_shared_gen) | |
947 | valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1); | |
948 | spin_unlock(&dir->i_lock); | |
949 | dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n", | |
950 | dir, (unsigned)ci->i_shared_gen, dentry, | |
951 | (unsigned)di->lease_shared_gen, valid); | |
952 | return valid; | |
953 | } | |
954 | ||
955 | /* | |
956 | * Check if cached dentry can be trusted. | |
957 | */ | |
958 | static int ceph_d_revalidate(struct dentry *dentry, struct nameidata *nd) | |
959 | { | |
960 | struct inode *dir = dentry->d_parent->d_inode; | |
961 | ||
962 | dout("d_revalidate %p '%.*s' inode %p\n", dentry, | |
963 | dentry->d_name.len, dentry->d_name.name, dentry->d_inode); | |
964 | ||
965 | /* always trust cached snapped dentries, snapdir dentry */ | |
966 | if (ceph_snap(dir) != CEPH_NOSNAP) { | |
967 | dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry, | |
968 | dentry->d_name.len, dentry->d_name.name, dentry->d_inode); | |
969 | goto out_touch; | |
970 | } | |
971 | if (dentry->d_inode && ceph_snap(dentry->d_inode) == CEPH_SNAPDIR) | |
972 | goto out_touch; | |
973 | ||
974 | if (dentry_lease_is_valid(dentry) || | |
975 | dir_lease_is_valid(dir, dentry)) | |
976 | goto out_touch; | |
977 | ||
978 | dout("d_revalidate %p invalid\n", dentry); | |
979 | d_drop(dentry); | |
980 | return 0; | |
981 | out_touch: | |
982 | ceph_dentry_lru_touch(dentry); | |
983 | return 1; | |
984 | } | |
985 | ||
986 | /* | |
987 | * When a dentry is released, clear the dir I_COMPLETE if it was part | |
988 | * of the current dir gen. | |
989 | */ | |
990 | static void ceph_dentry_release(struct dentry *dentry) | |
991 | { | |
992 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
993 | struct inode *parent_inode = dentry->d_parent->d_inode; | |
994 | ||
995 | if (parent_inode) { | |
996 | struct ceph_inode_info *ci = ceph_inode(parent_inode); | |
997 | ||
998 | spin_lock(&parent_inode->i_lock); | |
999 | if (ci->i_shared_gen == di->lease_shared_gen) { | |
1000 | dout(" clearing %p complete (d_release)\n", | |
1001 | parent_inode); | |
1002 | ci->i_ceph_flags &= ~CEPH_I_COMPLETE; | |
1003 | ci->i_release_count++; | |
1004 | } | |
1005 | spin_unlock(&parent_inode->i_lock); | |
1006 | } | |
1007 | if (di) { | |
1008 | ceph_dentry_lru_del(dentry); | |
1009 | if (di->lease_session) | |
1010 | ceph_put_mds_session(di->lease_session); | |
1011 | kmem_cache_free(ceph_dentry_cachep, di); | |
1012 | dentry->d_fsdata = NULL; | |
1013 | } | |
1014 | } | |
1015 | ||
1016 | static int ceph_snapdir_d_revalidate(struct dentry *dentry, | |
1017 | struct nameidata *nd) | |
1018 | { | |
1019 | /* | |
1020 | * Eventually, we'll want to revalidate snapped metadata | |
1021 | * too... probably... | |
1022 | */ | |
1023 | return 1; | |
1024 | } | |
1025 | ||
1026 | ||
1027 | ||
1028 | /* | |
1029 | * read() on a dir. This weird interface hack only works if mounted | |
1030 | * with '-o dirstat'. | |
1031 | */ | |
1032 | static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, | |
1033 | loff_t *ppos) | |
1034 | { | |
1035 | struct ceph_file_info *cf = file->private_data; | |
1036 | struct inode *inode = file->f_dentry->d_inode; | |
1037 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1038 | int left; | |
1039 | ||
1040 | if (!ceph_test_opt(ceph_client(inode->i_sb), DIRSTAT)) | |
1041 | return -EISDIR; | |
1042 | ||
1043 | if (!cf->dir_info) { | |
1044 | cf->dir_info = kmalloc(1024, GFP_NOFS); | |
1045 | if (!cf->dir_info) | |
1046 | return -ENOMEM; | |
1047 | cf->dir_info_len = | |
1048 | sprintf(cf->dir_info, | |
1049 | "entries: %20lld\n" | |
1050 | " files: %20lld\n" | |
1051 | " subdirs: %20lld\n" | |
1052 | "rentries: %20lld\n" | |
1053 | " rfiles: %20lld\n" | |
1054 | " rsubdirs: %20lld\n" | |
1055 | "rbytes: %20lld\n" | |
1056 | "rctime: %10ld.%09ld\n", | |
1057 | ci->i_files + ci->i_subdirs, | |
1058 | ci->i_files, | |
1059 | ci->i_subdirs, | |
1060 | ci->i_rfiles + ci->i_rsubdirs, | |
1061 | ci->i_rfiles, | |
1062 | ci->i_rsubdirs, | |
1063 | ci->i_rbytes, | |
1064 | (long)ci->i_rctime.tv_sec, | |
1065 | (long)ci->i_rctime.tv_nsec); | |
1066 | } | |
1067 | ||
1068 | if (*ppos >= cf->dir_info_len) | |
1069 | return 0; | |
1070 | size = min_t(unsigned, size, cf->dir_info_len-*ppos); | |
1071 | left = copy_to_user(buf, cf->dir_info + *ppos, size); | |
1072 | if (left == size) | |
1073 | return -EFAULT; | |
1074 | *ppos += (size - left); | |
1075 | return size - left; | |
1076 | } | |
1077 | ||
1078 | /* | |
1079 | * an fsync() on a dir will wait for any uncommitted directory | |
1080 | * operations to commit. | |
1081 | */ | |
1082 | static int ceph_dir_fsync(struct file *file, struct dentry *dentry, | |
1083 | int datasync) | |
1084 | { | |
1085 | struct inode *inode = dentry->d_inode; | |
1086 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1087 | struct list_head *head = &ci->i_unsafe_dirops; | |
1088 | struct ceph_mds_request *req; | |
1089 | u64 last_tid; | |
1090 | int ret = 0; | |
1091 | ||
1092 | dout("dir_fsync %p\n", inode); | |
1093 | spin_lock(&ci->i_unsafe_lock); | |
1094 | if (list_empty(head)) | |
1095 | goto out; | |
1096 | ||
1097 | req = list_entry(head->prev, | |
1098 | struct ceph_mds_request, r_unsafe_dir_item); | |
1099 | last_tid = req->r_tid; | |
1100 | ||
1101 | do { | |
1102 | ceph_mdsc_get_request(req); | |
1103 | spin_unlock(&ci->i_unsafe_lock); | |
1104 | dout("dir_fsync %p wait on tid %llu (until %llu)\n", | |
1105 | inode, req->r_tid, last_tid); | |
1106 | if (req->r_timeout) { | |
1107 | ret = wait_for_completion_timeout( | |
1108 | &req->r_safe_completion, req->r_timeout); | |
1109 | if (ret > 0) | |
1110 | ret = 0; | |
1111 | else if (ret == 0) | |
1112 | ret = -EIO; /* timed out */ | |
1113 | } else { | |
1114 | wait_for_completion(&req->r_safe_completion); | |
1115 | } | |
1116 | spin_lock(&ci->i_unsafe_lock); | |
1117 | ceph_mdsc_put_request(req); | |
1118 | ||
1119 | if (ret || list_empty(head)) | |
1120 | break; | |
1121 | req = list_entry(head->next, | |
1122 | struct ceph_mds_request, r_unsafe_dir_item); | |
1123 | } while (req->r_tid < last_tid); | |
1124 | out: | |
1125 | spin_unlock(&ci->i_unsafe_lock); | |
1126 | return ret; | |
1127 | } | |
1128 | ||
1129 | /* | |
1130 | * We maintain a private dentry LRU. | |
1131 | * | |
1132 | * FIXME: this needs to be changed to a per-mds lru to be useful. | |
1133 | */ | |
1134 | void ceph_dentry_lru_add(struct dentry *dn) | |
1135 | { | |
1136 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1137 | struct ceph_mds_client *mdsc; | |
2817b000 | 1138 | |
04a419f9 SW |
1139 | dout("dentry_lru_add %p %p '%.*s'\n", di, dn, |
1140 | dn->d_name.len, dn->d_name.name); | |
2817b000 SW |
1141 | if (di) { |
1142 | mdsc = &ceph_client(dn->d_sb)->mdsc; | |
1143 | spin_lock(&mdsc->dentry_lru_lock); | |
1144 | list_add_tail(&di->lru, &mdsc->dentry_lru); | |
1145 | mdsc->num_dentry++; | |
1146 | spin_unlock(&mdsc->dentry_lru_lock); | |
1147 | } | |
1148 | } | |
1149 | ||
1150 | void ceph_dentry_lru_touch(struct dentry *dn) | |
1151 | { | |
1152 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1153 | struct ceph_mds_client *mdsc; | |
2817b000 | 1154 | |
04a419f9 SW |
1155 | dout("dentry_lru_touch %p %p '%.*s'\n", di, dn, |
1156 | dn->d_name.len, dn->d_name.name); | |
2817b000 SW |
1157 | if (di) { |
1158 | mdsc = &ceph_client(dn->d_sb)->mdsc; | |
1159 | spin_lock(&mdsc->dentry_lru_lock); | |
1160 | list_move_tail(&di->lru, &mdsc->dentry_lru); | |
1161 | spin_unlock(&mdsc->dentry_lru_lock); | |
1162 | } | |
1163 | } | |
1164 | ||
1165 | void ceph_dentry_lru_del(struct dentry *dn) | |
1166 | { | |
1167 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1168 | struct ceph_mds_client *mdsc; | |
1169 | ||
04a419f9 SW |
1170 | dout("dentry_lru_del %p %p '%.*s'\n", di, dn, |
1171 | dn->d_name.len, dn->d_name.name); | |
2817b000 SW |
1172 | if (di) { |
1173 | mdsc = &ceph_client(dn->d_sb)->mdsc; | |
1174 | spin_lock(&mdsc->dentry_lru_lock); | |
1175 | list_del_init(&di->lru); | |
1176 | mdsc->num_dentry--; | |
1177 | spin_unlock(&mdsc->dentry_lru_lock); | |
1178 | } | |
1179 | } | |
1180 | ||
1181 | const struct file_operations ceph_dir_fops = { | |
1182 | .read = ceph_read_dir, | |
1183 | .readdir = ceph_readdir, | |
1184 | .llseek = ceph_dir_llseek, | |
1185 | .open = ceph_open, | |
1186 | .release = ceph_release, | |
1187 | .unlocked_ioctl = ceph_ioctl, | |
1188 | .fsync = ceph_dir_fsync, | |
1189 | }; | |
1190 | ||
1191 | const struct inode_operations ceph_dir_iops = { | |
1192 | .lookup = ceph_lookup, | |
1193 | .permission = ceph_permission, | |
1194 | .getattr = ceph_getattr, | |
1195 | .setattr = ceph_setattr, | |
1196 | .setxattr = ceph_setxattr, | |
1197 | .getxattr = ceph_getxattr, | |
1198 | .listxattr = ceph_listxattr, | |
1199 | .removexattr = ceph_removexattr, | |
1200 | .mknod = ceph_mknod, | |
1201 | .symlink = ceph_symlink, | |
1202 | .mkdir = ceph_mkdir, | |
1203 | .link = ceph_link, | |
1204 | .unlink = ceph_unlink, | |
1205 | .rmdir = ceph_unlink, | |
1206 | .rename = ceph_rename, | |
1207 | .create = ceph_create, | |
1208 | }; | |
1209 | ||
1210 | struct dentry_operations ceph_dentry_ops = { | |
1211 | .d_revalidate = ceph_d_revalidate, | |
1212 | .d_release = ceph_dentry_release, | |
1213 | }; | |
1214 | ||
1215 | struct dentry_operations ceph_snapdir_dentry_ops = { | |
1216 | .d_revalidate = ceph_snapdir_d_revalidate, | |
1217 | }; | |
1218 | ||
1219 | struct dentry_operations ceph_snap_dentry_ops = { | |
1220 | }; |