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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> | |
5a0e3ad6 | 6 | #include <linux/slab.h> |
2817b000 SW |
7 | #include <linux/sched.h> |
8 | ||
9 | #include "super.h" | |
10 | ||
11 | /* | |
12 | * Directory operations: readdir, lookup, create, link, unlink, | |
13 | * rename, etc. | |
14 | */ | |
15 | ||
16 | /* | |
17 | * Ceph MDS operations are specified in terms of a base ino and | |
18 | * relative path. Thus, the client can specify an operation on a | |
19 | * specific inode (e.g., a getattr due to fstat(2)), or as a path | |
20 | * relative to, say, the root directory. | |
21 | * | |
22 | * Normally, we limit ourselves to strict inode ops (no path component) | |
23 | * or dentry operations (a single path component relative to an ino). The | |
24 | * exception to this is open_root_dentry(), which will open the mount | |
25 | * point by name. | |
26 | */ | |
27 | ||
28 | const struct inode_operations ceph_dir_iops; | |
29 | const struct file_operations ceph_dir_fops; | |
30 | struct dentry_operations ceph_dentry_ops; | |
31 | ||
32 | /* | |
33 | * Initialize ceph dentry state. | |
34 | */ | |
35 | int ceph_init_dentry(struct dentry *dentry) | |
36 | { | |
37 | struct ceph_dentry_info *di; | |
38 | ||
39 | if (dentry->d_fsdata) | |
40 | return 0; | |
41 | ||
42 | if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) | |
43 | dentry->d_op = &ceph_dentry_ops; | |
44 | else if (ceph_snap(dentry->d_parent->d_inode) == CEPH_SNAPDIR) | |
45 | dentry->d_op = &ceph_snapdir_dentry_ops; | |
46 | else | |
47 | dentry->d_op = &ceph_snap_dentry_ops; | |
48 | ||
49 | di = kmem_cache_alloc(ceph_dentry_cachep, GFP_NOFS); | |
50 | if (!di) | |
51 | return -ENOMEM; /* oh well */ | |
52 | ||
53 | spin_lock(&dentry->d_lock); | |
8c6efb58 SW |
54 | if (dentry->d_fsdata) { |
55 | /* lost a race */ | |
56 | kmem_cache_free(ceph_dentry_cachep, di); | |
2817b000 | 57 | goto out_unlock; |
8c6efb58 | 58 | } |
2817b000 SW |
59 | di->dentry = dentry; |
60 | di->lease_session = NULL; | |
61 | dentry->d_fsdata = di; | |
62 | dentry->d_time = jiffies; | |
63 | ceph_dentry_lru_add(dentry); | |
64 | out_unlock: | |
65 | spin_unlock(&dentry->d_lock); | |
66 | return 0; | |
67 | } | |
68 | ||
69 | ||
70 | ||
71 | /* | |
72 | * for readdir, we encode the directory frag and offset within that | |
73 | * frag into f_pos. | |
74 | */ | |
75 | static unsigned fpos_frag(loff_t p) | |
76 | { | |
77 | return p >> 32; | |
78 | } | |
79 | static unsigned fpos_off(loff_t p) | |
80 | { | |
81 | return p & 0xffffffff; | |
82 | } | |
83 | ||
84 | /* | |
85 | * When possible, we try to satisfy a readdir by peeking at the | |
86 | * dcache. We make this work by carefully ordering dentries on | |
87 | * d_u.d_child when we initially get results back from the MDS, and | |
88 | * falling back to a "normal" sync readdir if any dentries in the dir | |
89 | * are dropped. | |
90 | * | |
91 | * I_COMPLETE tells indicates we have all dentries in the dir. It is | |
92 | * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by | |
93 | * the MDS if/when the directory is modified). | |
94 | */ | |
95 | static int __dcache_readdir(struct file *filp, | |
96 | void *dirent, filldir_t filldir) | |
97 | { | |
98 | struct inode *inode = filp->f_dentry->d_inode; | |
99 | struct ceph_file_info *fi = filp->private_data; | |
100 | struct dentry *parent = filp->f_dentry; | |
101 | struct inode *dir = parent->d_inode; | |
102 | struct list_head *p; | |
103 | struct dentry *dentry, *last; | |
104 | struct ceph_dentry_info *di; | |
105 | int err = 0; | |
106 | ||
107 | /* claim ref on last dentry we returned */ | |
108 | last = fi->dentry; | |
109 | fi->dentry = NULL; | |
110 | ||
111 | dout("__dcache_readdir %p at %llu (last %p)\n", dir, filp->f_pos, | |
112 | last); | |
113 | ||
114 | spin_lock(&dcache_lock); | |
115 | ||
116 | /* start at beginning? */ | |
117 | if (filp->f_pos == 2 || (last && | |
118 | filp->f_pos < ceph_dentry(last)->offset)) { | |
119 | if (list_empty(&parent->d_subdirs)) | |
120 | goto out_unlock; | |
121 | p = parent->d_subdirs.prev; | |
122 | dout(" initial p %p/%p\n", p->prev, p->next); | |
123 | } else { | |
124 | p = last->d_u.d_child.prev; | |
125 | } | |
126 | ||
127 | more: | |
128 | dentry = list_entry(p, struct dentry, d_u.d_child); | |
129 | di = ceph_dentry(dentry); | |
130 | while (1) { | |
131 | dout(" p %p/%p d_subdirs %p/%p\n", p->prev, p->next, | |
132 | parent->d_subdirs.prev, parent->d_subdirs.next); | |
133 | if (p == &parent->d_subdirs) { | |
134 | fi->at_end = 1; | |
135 | goto out_unlock; | |
136 | } | |
137 | if (!d_unhashed(dentry) && dentry->d_inode && | |
09b8a7d2 | 138 | ceph_snap(dentry->d_inode) != CEPH_SNAPDIR && |
1d1de916 | 139 | ceph_ino(dentry->d_inode) != CEPH_INO_CEPH && |
2817b000 SW |
140 | filp->f_pos <= di->offset) |
141 | break; | |
142 | dout(" skipping %p %.*s at %llu (%llu)%s%s\n", dentry, | |
143 | dentry->d_name.len, dentry->d_name.name, di->offset, | |
144 | filp->f_pos, d_unhashed(dentry) ? " unhashed" : "", | |
145 | !dentry->d_inode ? " null" : ""); | |
146 | p = p->prev; | |
147 | dentry = list_entry(p, struct dentry, d_u.d_child); | |
148 | di = ceph_dentry(dentry); | |
149 | } | |
150 | ||
151 | atomic_inc(&dentry->d_count); | |
152 | spin_unlock(&dcache_lock); | |
153 | spin_unlock(&inode->i_lock); | |
154 | ||
155 | dout(" %llu (%llu) dentry %p %.*s %p\n", di->offset, filp->f_pos, | |
156 | dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode); | |
157 | filp->f_pos = di->offset; | |
158 | err = filldir(dirent, dentry->d_name.name, | |
159 | dentry->d_name.len, di->offset, | |
160 | dentry->d_inode->i_ino, | |
161 | dentry->d_inode->i_mode >> 12); | |
162 | ||
163 | if (last) { | |
164 | if (err < 0) { | |
165 | /* remember our position */ | |
166 | fi->dentry = last; | |
167 | fi->next_offset = di->offset; | |
168 | } else { | |
169 | dput(last); | |
170 | } | |
171 | last = NULL; | |
172 | } | |
173 | ||
174 | spin_lock(&inode->i_lock); | |
175 | spin_lock(&dcache_lock); | |
176 | ||
f5b06628 SW |
177 | last = dentry; |
178 | ||
2817b000 SW |
179 | if (err < 0) |
180 | goto out_unlock; | |
181 | ||
2817b000 SW |
182 | p = p->prev; |
183 | filp->f_pos++; | |
184 | ||
185 | /* make sure a dentry wasn't dropped while we didn't have dcache_lock */ | |
186 | if ((ceph_inode(dir)->i_ceph_flags & CEPH_I_COMPLETE)) | |
187 | goto more; | |
188 | dout(" lost I_COMPLETE on %p; falling back to mds\n", dir); | |
189 | err = -EAGAIN; | |
190 | ||
191 | out_unlock: | |
192 | spin_unlock(&dcache_lock); | |
193 | ||
194 | if (last) { | |
195 | spin_unlock(&inode->i_lock); | |
196 | dput(last); | |
197 | spin_lock(&inode->i_lock); | |
198 | } | |
199 | ||
200 | return err; | |
201 | } | |
202 | ||
203 | /* | |
204 | * make note of the last dentry we read, so we can | |
205 | * continue at the same lexicographical point, | |
206 | * regardless of what dir changes take place on the | |
207 | * server. | |
208 | */ | |
209 | static int note_last_dentry(struct ceph_file_info *fi, const char *name, | |
210 | int len) | |
211 | { | |
212 | kfree(fi->last_name); | |
213 | fi->last_name = kmalloc(len+1, GFP_NOFS); | |
214 | if (!fi->last_name) | |
215 | return -ENOMEM; | |
216 | memcpy(fi->last_name, name, len); | |
217 | fi->last_name[len] = 0; | |
218 | dout("note_last_dentry '%s'\n", fi->last_name); | |
219 | return 0; | |
220 | } | |
221 | ||
222 | static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
223 | { | |
224 | struct ceph_file_info *fi = filp->private_data; | |
225 | struct inode *inode = filp->f_dentry->d_inode; | |
226 | struct ceph_inode_info *ci = ceph_inode(inode); | |
227 | struct ceph_client *client = ceph_inode_to_client(inode); | |
228 | struct ceph_mds_client *mdsc = &client->mdsc; | |
229 | unsigned frag = fpos_frag(filp->f_pos); | |
230 | int off = fpos_off(filp->f_pos); | |
231 | int err; | |
232 | u32 ftype; | |
233 | struct ceph_mds_reply_info_parsed *rinfo; | |
6b805185 | 234 | const int max_entries = client->mount_args->max_readdir; |
2817b000 SW |
235 | |
236 | dout("readdir %p filp %p frag %u off %u\n", inode, filp, frag, off); | |
237 | if (fi->at_end) | |
238 | return 0; | |
239 | ||
240 | /* always start with . and .. */ | |
241 | if (filp->f_pos == 0) { | |
242 | /* note dir version at start of readdir so we can tell | |
243 | * if any dentries get dropped */ | |
244 | fi->dir_release_count = ci->i_release_count; | |
245 | ||
246 | dout("readdir off 0 -> '.'\n"); | |
247 | if (filldir(dirent, ".", 1, ceph_make_fpos(0, 0), | |
248 | inode->i_ino, inode->i_mode >> 12) < 0) | |
249 | return 0; | |
250 | filp->f_pos = 1; | |
251 | off = 1; | |
252 | } | |
253 | if (filp->f_pos == 1) { | |
254 | dout("readdir off 1 -> '..'\n"); | |
255 | if (filldir(dirent, "..", 2, ceph_make_fpos(0, 1), | |
256 | filp->f_dentry->d_parent->d_inode->i_ino, | |
257 | inode->i_mode >> 12) < 0) | |
258 | return 0; | |
259 | filp->f_pos = 2; | |
260 | off = 2; | |
261 | } | |
262 | ||
263 | /* can we use the dcache? */ | |
264 | spin_lock(&inode->i_lock); | |
265 | if ((filp->f_pos == 2 || fi->dentry) && | |
266 | !ceph_test_opt(client, NOASYNCREADDIR) && | |
267 | (ci->i_ceph_flags & CEPH_I_COMPLETE) && | |
268 | __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) { | |
269 | err = __dcache_readdir(filp, dirent, filldir); | |
270 | if (err != -EAGAIN) { | |
271 | spin_unlock(&inode->i_lock); | |
272 | return err; | |
273 | } | |
274 | } | |
275 | spin_unlock(&inode->i_lock); | |
276 | if (fi->dentry) { | |
277 | err = note_last_dentry(fi, fi->dentry->d_name.name, | |
278 | fi->dentry->d_name.len); | |
279 | if (err) | |
280 | return err; | |
281 | dput(fi->dentry); | |
282 | fi->dentry = NULL; | |
283 | } | |
284 | ||
285 | /* proceed with a normal readdir */ | |
286 | ||
287 | more: | |
288 | /* do we have the correct frag content buffered? */ | |
289 | if (fi->frag != frag || fi->last_readdir == NULL) { | |
290 | struct ceph_mds_request *req; | |
291 | int op = ceph_snap(inode) == CEPH_SNAPDIR ? | |
292 | CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR; | |
293 | ||
294 | /* discard old result, if any */ | |
393f6620 | 295 | if (fi->last_readdir) { |
2817b000 | 296 | ceph_mdsc_put_request(fi->last_readdir); |
393f6620 SW |
297 | fi->last_readdir = NULL; |
298 | } | |
2817b000 SW |
299 | |
300 | /* requery frag tree, as the frag topology may have changed */ | |
301 | frag = ceph_choose_frag(ceph_inode(inode), frag, NULL, NULL); | |
302 | ||
303 | dout("readdir fetching %llx.%llx frag %x offset '%s'\n", | |
304 | ceph_vinop(inode), frag, fi->last_name); | |
305 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
306 | if (IS_ERR(req)) | |
307 | return PTR_ERR(req); | |
308 | req->r_inode = igrab(inode); | |
309 | req->r_dentry = dget(filp->f_dentry); | |
310 | /* hints to request -> mds selection code */ | |
311 | req->r_direct_mode = USE_AUTH_MDS; | |
312 | req->r_direct_hash = ceph_frag_value(frag); | |
313 | req->r_direct_is_hash = true; | |
314 | req->r_path2 = kstrdup(fi->last_name, GFP_NOFS); | |
315 | req->r_readdir_offset = fi->next_offset; | |
316 | req->r_args.readdir.frag = cpu_to_le32(frag); | |
317 | req->r_args.readdir.max_entries = cpu_to_le32(max_entries); | |
e1e4dd0c | 318 | req->r_num_caps = max_entries + 1; |
2817b000 SW |
319 | err = ceph_mdsc_do_request(mdsc, NULL, req); |
320 | if (err < 0) { | |
321 | ceph_mdsc_put_request(req); | |
322 | return err; | |
323 | } | |
324 | dout("readdir got and parsed readdir result=%d" | |
325 | " on frag %x, end=%d, complete=%d\n", err, frag, | |
326 | (int)req->r_reply_info.dir_end, | |
327 | (int)req->r_reply_info.dir_complete); | |
328 | ||
329 | if (!req->r_did_prepopulate) { | |
330 | dout("readdir !did_prepopulate"); | |
331 | fi->dir_release_count--; /* preclude I_COMPLETE */ | |
332 | } | |
333 | ||
334 | /* note next offset and last dentry name */ | |
335 | fi->offset = fi->next_offset; | |
336 | fi->last_readdir = req; | |
337 | ||
338 | if (req->r_reply_info.dir_end) { | |
339 | kfree(fi->last_name); | |
340 | fi->last_name = NULL; | |
f1f2765f | 341 | fi->next_offset = 2; |
2817b000 SW |
342 | } else { |
343 | rinfo = &req->r_reply_info; | |
344 | err = note_last_dentry(fi, | |
345 | rinfo->dir_dname[rinfo->dir_nr-1], | |
346 | rinfo->dir_dname_len[rinfo->dir_nr-1]); | |
347 | if (err) | |
348 | return err; | |
349 | fi->next_offset += rinfo->dir_nr; | |
350 | } | |
351 | } | |
352 | ||
353 | rinfo = &fi->last_readdir->r_reply_info; | |
354 | dout("readdir frag %x num %d off %d chunkoff %d\n", frag, | |
355 | rinfo->dir_nr, off, fi->offset); | |
356 | while (off - fi->offset >= 0 && off - fi->offset < rinfo->dir_nr) { | |
357 | u64 pos = ceph_make_fpos(frag, off); | |
358 | struct ceph_mds_reply_inode *in = | |
359 | rinfo->dir_in[off - fi->offset].in; | |
360 | dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n", | |
361 | off, off - fi->offset, rinfo->dir_nr, pos, | |
362 | rinfo->dir_dname_len[off - fi->offset], | |
363 | rinfo->dir_dname[off - fi->offset], in); | |
364 | BUG_ON(!in); | |
365 | ftype = le32_to_cpu(in->mode) >> 12; | |
366 | if (filldir(dirent, | |
367 | rinfo->dir_dname[off - fi->offset], | |
368 | rinfo->dir_dname_len[off - fi->offset], | |
369 | pos, | |
370 | le64_to_cpu(in->ino), | |
371 | ftype) < 0) { | |
372 | dout("filldir stopping us...\n"); | |
373 | return 0; | |
374 | } | |
375 | off++; | |
376 | filp->f_pos = pos + 1; | |
377 | } | |
378 | ||
379 | if (fi->last_name) { | |
380 | ceph_mdsc_put_request(fi->last_readdir); | |
381 | fi->last_readdir = NULL; | |
382 | goto more; | |
383 | } | |
384 | ||
385 | /* more frags? */ | |
386 | if (!ceph_frag_is_rightmost(frag)) { | |
387 | frag = ceph_frag_next(frag); | |
388 | off = 0; | |
389 | filp->f_pos = ceph_make_fpos(frag, off); | |
390 | dout("readdir next frag is %x\n", frag); | |
391 | goto more; | |
392 | } | |
393 | fi->at_end = 1; | |
394 | ||
395 | /* | |
396 | * if dir_release_count still matches the dir, no dentries | |
397 | * were released during the whole readdir, and we should have | |
398 | * the complete dir contents in our cache. | |
399 | */ | |
400 | spin_lock(&inode->i_lock); | |
401 | if (ci->i_release_count == fi->dir_release_count) { | |
402 | dout(" marking %p complete\n", inode); | |
403 | ci->i_ceph_flags |= CEPH_I_COMPLETE; | |
404 | ci->i_max_offset = filp->f_pos; | |
405 | } | |
406 | spin_unlock(&inode->i_lock); | |
407 | ||
408 | dout("readdir %p filp %p done.\n", inode, filp); | |
409 | return 0; | |
410 | } | |
411 | ||
412 | static void reset_readdir(struct ceph_file_info *fi) | |
413 | { | |
414 | if (fi->last_readdir) { | |
415 | ceph_mdsc_put_request(fi->last_readdir); | |
416 | fi->last_readdir = NULL; | |
417 | } | |
418 | kfree(fi->last_name); | |
419 | fi->next_offset = 2; /* compensate for . and .. */ | |
420 | if (fi->dentry) { | |
421 | dput(fi->dentry); | |
422 | fi->dentry = NULL; | |
423 | } | |
424 | fi->at_end = 0; | |
425 | } | |
426 | ||
427 | static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int origin) | |
428 | { | |
429 | struct ceph_file_info *fi = file->private_data; | |
430 | struct inode *inode = file->f_mapping->host; | |
431 | loff_t old_offset = offset; | |
432 | loff_t retval; | |
433 | ||
434 | mutex_lock(&inode->i_mutex); | |
435 | switch (origin) { | |
436 | case SEEK_END: | |
437 | offset += inode->i_size + 2; /* FIXME */ | |
438 | break; | |
439 | case SEEK_CUR: | |
440 | offset += file->f_pos; | |
441 | } | |
442 | retval = -EINVAL; | |
443 | if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) { | |
444 | if (offset != file->f_pos) { | |
445 | file->f_pos = offset; | |
446 | file->f_version = 0; | |
447 | fi->at_end = 0; | |
448 | } | |
449 | retval = offset; | |
450 | ||
451 | /* | |
452 | * discard buffered readdir content on seekdir(0), or | |
453 | * seek to new frag, or seek prior to current chunk. | |
454 | */ | |
455 | if (offset == 0 || | |
456 | fpos_frag(offset) != fpos_frag(old_offset) || | |
457 | fpos_off(offset) < fi->offset) { | |
458 | dout("dir_llseek dropping %p content\n", file); | |
459 | reset_readdir(fi); | |
460 | } | |
461 | ||
462 | /* bump dir_release_count if we did a forward seek */ | |
463 | if (offset > old_offset) | |
464 | fi->dir_release_count--; | |
465 | } | |
466 | mutex_unlock(&inode->i_mutex); | |
467 | return retval; | |
468 | } | |
469 | ||
470 | /* | |
471 | * Process result of a lookup/open request. | |
472 | * | |
473 | * Mainly, make sure we return the final req->r_dentry (if it already | |
474 | * existed) in place of the original VFS-provided dentry when they | |
475 | * differ. | |
476 | * | |
477 | * Gracefully handle the case where the MDS replies with -ENOENT and | |
478 | * no trace (which it may do, at its discretion, e.g., if it doesn't | |
479 | * care to issue a lease on the negative dentry). | |
480 | */ | |
481 | struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, | |
482 | struct dentry *dentry, int err) | |
483 | { | |
640ef79d | 484 | struct ceph_client *client = ceph_sb_to_client(dentry->d_sb); |
2817b000 SW |
485 | struct inode *parent = dentry->d_parent->d_inode; |
486 | ||
487 | /* .snap dir? */ | |
488 | if (err == -ENOENT && | |
489 | ceph_vino(parent).ino != CEPH_INO_ROOT && /* no .snap in root dir */ | |
6b805185 SW |
490 | strcmp(dentry->d_name.name, |
491 | client->mount_args->snapdir_name) == 0) { | |
2817b000 SW |
492 | struct inode *inode = ceph_get_snapdir(parent); |
493 | dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p\n", | |
494 | dentry, dentry->d_name.len, dentry->d_name.name, inode); | |
9358c6d4 | 495 | BUG_ON(!d_unhashed(dentry)); |
2817b000 SW |
496 | d_add(dentry, inode); |
497 | err = 0; | |
498 | } | |
499 | ||
500 | if (err == -ENOENT) { | |
501 | /* no trace? */ | |
502 | err = 0; | |
503 | if (!req->r_reply_info.head->is_dentry) { | |
504 | dout("ENOENT and no trace, dentry %p inode %p\n", | |
505 | dentry, dentry->d_inode); | |
506 | if (dentry->d_inode) { | |
507 | d_drop(dentry); | |
508 | err = -ENOENT; | |
509 | } else { | |
510 | d_add(dentry, NULL); | |
511 | } | |
512 | } | |
513 | } | |
514 | if (err) | |
515 | dentry = ERR_PTR(err); | |
516 | else if (dentry != req->r_dentry) | |
517 | dentry = dget(req->r_dentry); /* we got spliced */ | |
518 | else | |
519 | dentry = NULL; | |
520 | return dentry; | |
521 | } | |
522 | ||
1d1de916 SW |
523 | static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry) |
524 | { | |
525 | return ceph_ino(inode) == CEPH_INO_ROOT && | |
526 | strncmp(dentry->d_name.name, ".ceph", 5) == 0; | |
527 | } | |
528 | ||
2817b000 SW |
529 | /* |
530 | * Look up a single dir entry. If there is a lookup intent, inform | |
531 | * the MDS so that it gets our 'caps wanted' value in a single op. | |
532 | */ | |
533 | static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry, | |
534 | struct nameidata *nd) | |
535 | { | |
536 | struct ceph_client *client = ceph_sb_to_client(dir->i_sb); | |
537 | struct ceph_mds_client *mdsc = &client->mdsc; | |
538 | struct ceph_mds_request *req; | |
539 | int op; | |
540 | int err; | |
541 | ||
542 | dout("lookup %p dentry %p '%.*s'\n", | |
543 | dir, dentry, dentry->d_name.len, dentry->d_name.name); | |
544 | ||
545 | if (dentry->d_name.len > NAME_MAX) | |
546 | return ERR_PTR(-ENAMETOOLONG); | |
547 | ||
548 | err = ceph_init_dentry(dentry); | |
549 | if (err < 0) | |
550 | return ERR_PTR(err); | |
551 | ||
552 | /* open (but not create!) intent? */ | |
553 | if (nd && | |
554 | (nd->flags & LOOKUP_OPEN) && | |
555 | (nd->flags & LOOKUP_CONTINUE) == 0 && /* only open last component */ | |
556 | !(nd->intent.open.flags & O_CREAT)) { | |
557 | int mode = nd->intent.open.create_mode & ~current->fs->umask; | |
558 | return ceph_lookup_open(dir, dentry, nd, mode, 1); | |
559 | } | |
560 | ||
561 | /* can we conclude ENOENT locally? */ | |
562 | if (dentry->d_inode == NULL) { | |
563 | struct ceph_inode_info *ci = ceph_inode(dir); | |
564 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
565 | ||
566 | spin_lock(&dir->i_lock); | |
567 | dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags); | |
568 | if (strncmp(dentry->d_name.name, | |
6b805185 | 569 | client->mount_args->snapdir_name, |
2817b000 | 570 | dentry->d_name.len) && |
1d1de916 | 571 | !is_root_ceph_dentry(dir, dentry) && |
2817b000 SW |
572 | (ci->i_ceph_flags & CEPH_I_COMPLETE) && |
573 | (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) { | |
574 | di->offset = ci->i_max_offset++; | |
575 | spin_unlock(&dir->i_lock); | |
576 | dout(" dir %p complete, -ENOENT\n", dir); | |
577 | d_add(dentry, NULL); | |
578 | di->lease_shared_gen = ci->i_shared_gen; | |
579 | return NULL; | |
580 | } | |
581 | spin_unlock(&dir->i_lock); | |
582 | } | |
583 | ||
584 | op = ceph_snap(dir) == CEPH_SNAPDIR ? | |
585 | CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; | |
586 | req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); | |
587 | if (IS_ERR(req)) | |
588 | return ERR_PTR(PTR_ERR(req)); | |
589 | req->r_dentry = dget(dentry); | |
590 | req->r_num_caps = 2; | |
591 | /* we only need inode linkage */ | |
592 | req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); | |
593 | req->r_locked_dir = dir; | |
594 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
595 | dentry = ceph_finish_lookup(req, dentry, err); | |
596 | ceph_mdsc_put_request(req); /* will dput(dentry) */ | |
597 | dout("lookup result=%p\n", dentry); | |
598 | return dentry; | |
599 | } | |
600 | ||
601 | /* | |
602 | * If we do a create but get no trace back from the MDS, follow up with | |
603 | * a lookup (the VFS expects us to link up the provided dentry). | |
604 | */ | |
605 | int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry) | |
606 | { | |
607 | struct dentry *result = ceph_lookup(dir, dentry, NULL); | |
608 | ||
609 | if (result && !IS_ERR(result)) { | |
610 | /* | |
611 | * We created the item, then did a lookup, and found | |
612 | * it was already linked to another inode we already | |
613 | * had in our cache (and thus got spliced). Link our | |
614 | * dentry to that inode, but don't hash it, just in | |
615 | * case the VFS wants to dereference it. | |
616 | */ | |
617 | BUG_ON(!result->d_inode); | |
618 | d_instantiate(dentry, result->d_inode); | |
619 | return 0; | |
620 | } | |
621 | return PTR_ERR(result); | |
622 | } | |
623 | ||
624 | static int ceph_mknod(struct inode *dir, struct dentry *dentry, | |
625 | int mode, dev_t rdev) | |
626 | { | |
627 | struct ceph_client *client = ceph_sb_to_client(dir->i_sb); | |
628 | struct ceph_mds_client *mdsc = &client->mdsc; | |
629 | struct ceph_mds_request *req; | |
630 | int err; | |
631 | ||
632 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
633 | return -EROFS; | |
634 | ||
635 | dout("mknod in dir %p dentry %p mode 0%o rdev %d\n", | |
636 | dir, dentry, mode, rdev); | |
637 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS); | |
638 | if (IS_ERR(req)) { | |
639 | d_drop(dentry); | |
640 | return PTR_ERR(req); | |
641 | } | |
642 | req->r_dentry = dget(dentry); | |
643 | req->r_num_caps = 2; | |
644 | req->r_locked_dir = dir; | |
645 | req->r_args.mknod.mode = cpu_to_le32(mode); | |
646 | req->r_args.mknod.rdev = cpu_to_le32(rdev); | |
647 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
648 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
649 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
650 | if (!err && !req->r_reply_info.head->is_dentry) | |
651 | err = ceph_handle_notrace_create(dir, dentry); | |
652 | ceph_mdsc_put_request(req); | |
653 | if (err) | |
654 | d_drop(dentry); | |
655 | return err; | |
656 | } | |
657 | ||
658 | static int ceph_create(struct inode *dir, struct dentry *dentry, int mode, | |
659 | struct nameidata *nd) | |
660 | { | |
661 | dout("create in dir %p dentry %p name '%.*s'\n", | |
662 | dir, dentry, dentry->d_name.len, dentry->d_name.name); | |
663 | ||
664 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
665 | return -EROFS; | |
666 | ||
667 | if (nd) { | |
668 | BUG_ON((nd->flags & LOOKUP_OPEN) == 0); | |
669 | dentry = ceph_lookup_open(dir, dentry, nd, mode, 0); | |
670 | /* hrm, what should i do here if we get aliased? */ | |
671 | if (IS_ERR(dentry)) | |
672 | return PTR_ERR(dentry); | |
673 | return 0; | |
674 | } | |
675 | ||
676 | /* fall back to mknod */ | |
677 | return ceph_mknod(dir, dentry, (mode & ~S_IFMT) | S_IFREG, 0); | |
678 | } | |
679 | ||
680 | static int ceph_symlink(struct inode *dir, struct dentry *dentry, | |
681 | const char *dest) | |
682 | { | |
683 | struct ceph_client *client = ceph_sb_to_client(dir->i_sb); | |
684 | struct ceph_mds_client *mdsc = &client->mdsc; | |
685 | struct ceph_mds_request *req; | |
686 | int err; | |
687 | ||
688 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
689 | return -EROFS; | |
690 | ||
691 | dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest); | |
692 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS); | |
693 | if (IS_ERR(req)) { | |
694 | d_drop(dentry); | |
695 | return PTR_ERR(req); | |
696 | } | |
697 | req->r_dentry = dget(dentry); | |
698 | req->r_num_caps = 2; | |
699 | req->r_path2 = kstrdup(dest, GFP_NOFS); | |
700 | req->r_locked_dir = dir; | |
701 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
702 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
703 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
704 | if (!err && !req->r_reply_info.head->is_dentry) | |
705 | err = ceph_handle_notrace_create(dir, dentry); | |
706 | ceph_mdsc_put_request(req); | |
707 | if (err) | |
708 | d_drop(dentry); | |
709 | return err; | |
710 | } | |
711 | ||
712 | static int ceph_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
713 | { | |
714 | struct ceph_client *client = ceph_sb_to_client(dir->i_sb); | |
715 | struct ceph_mds_client *mdsc = &client->mdsc; | |
716 | struct ceph_mds_request *req; | |
717 | int err = -EROFS; | |
718 | int op; | |
719 | ||
720 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
721 | /* mkdir .snap/foo is a MKSNAP */ | |
722 | op = CEPH_MDS_OP_MKSNAP; | |
723 | dout("mksnap dir %p snap '%.*s' dn %p\n", dir, | |
724 | dentry->d_name.len, dentry->d_name.name, dentry); | |
725 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { | |
726 | dout("mkdir dir %p dn %p mode 0%o\n", dir, dentry, mode); | |
727 | op = CEPH_MDS_OP_MKDIR; | |
728 | } else { | |
729 | goto out; | |
730 | } | |
731 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
732 | if (IS_ERR(req)) { | |
733 | err = PTR_ERR(req); | |
734 | goto out; | |
735 | } | |
736 | ||
737 | req->r_dentry = dget(dentry); | |
738 | req->r_num_caps = 2; | |
739 | req->r_locked_dir = dir; | |
740 | req->r_args.mkdir.mode = cpu_to_le32(mode); | |
741 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
742 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
743 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
744 | if (!err && !req->r_reply_info.head->is_dentry) | |
745 | err = ceph_handle_notrace_create(dir, dentry); | |
746 | ceph_mdsc_put_request(req); | |
747 | out: | |
748 | if (err < 0) | |
749 | d_drop(dentry); | |
750 | return err; | |
751 | } | |
752 | ||
753 | static int ceph_link(struct dentry *old_dentry, struct inode *dir, | |
754 | struct dentry *dentry) | |
755 | { | |
756 | struct ceph_client *client = ceph_sb_to_client(dir->i_sb); | |
757 | struct ceph_mds_client *mdsc = &client->mdsc; | |
758 | struct ceph_mds_request *req; | |
759 | int err; | |
760 | ||
761 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
762 | return -EROFS; | |
763 | ||
764 | dout("link in dir %p old_dentry %p dentry %p\n", dir, | |
765 | old_dentry, dentry); | |
766 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS); | |
767 | if (IS_ERR(req)) { | |
768 | d_drop(dentry); | |
769 | return PTR_ERR(req); | |
770 | } | |
771 | req->r_dentry = dget(dentry); | |
772 | req->r_num_caps = 2; | |
773 | req->r_old_dentry = dget(old_dentry); /* or inode? hrm. */ | |
774 | req->r_locked_dir = dir; | |
775 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
776 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
777 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
778 | if (err) | |
779 | d_drop(dentry); | |
780 | else if (!req->r_reply_info.head->is_dentry) | |
781 | d_instantiate(dentry, igrab(old_dentry->d_inode)); | |
782 | ceph_mdsc_put_request(req); | |
783 | return err; | |
784 | } | |
785 | ||
786 | /* | |
787 | * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it | |
788 | * looks like the link count will hit 0, drop any other caps (other | |
789 | * than PIN) we don't specifically want (due to the file still being | |
790 | * open). | |
791 | */ | |
792 | static int drop_caps_for_unlink(struct inode *inode) | |
793 | { | |
794 | struct ceph_inode_info *ci = ceph_inode(inode); | |
795 | int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; | |
796 | ||
797 | spin_lock(&inode->i_lock); | |
798 | if (inode->i_nlink == 1) { | |
799 | drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN); | |
800 | ci->i_ceph_flags |= CEPH_I_NODELAY; | |
801 | } | |
802 | spin_unlock(&inode->i_lock); | |
803 | return drop; | |
804 | } | |
805 | ||
806 | /* | |
807 | * rmdir and unlink are differ only by the metadata op code | |
808 | */ | |
809 | static int ceph_unlink(struct inode *dir, struct dentry *dentry) | |
810 | { | |
811 | struct ceph_client *client = ceph_sb_to_client(dir->i_sb); | |
812 | struct ceph_mds_client *mdsc = &client->mdsc; | |
813 | struct inode *inode = dentry->d_inode; | |
814 | struct ceph_mds_request *req; | |
815 | int err = -EROFS; | |
816 | int op; | |
817 | ||
818 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
819 | /* rmdir .snap/foo is RMSNAP */ | |
820 | dout("rmsnap dir %p '%.*s' dn %p\n", dir, dentry->d_name.len, | |
821 | dentry->d_name.name, dentry); | |
822 | op = CEPH_MDS_OP_RMSNAP; | |
823 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { | |
824 | dout("unlink/rmdir dir %p dn %p inode %p\n", | |
825 | dir, dentry, inode); | |
826 | op = ((dentry->d_inode->i_mode & S_IFMT) == S_IFDIR) ? | |
827 | CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK; | |
828 | } else | |
829 | goto out; | |
830 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
831 | if (IS_ERR(req)) { | |
832 | err = PTR_ERR(req); | |
833 | goto out; | |
834 | } | |
835 | req->r_dentry = dget(dentry); | |
836 | req->r_num_caps = 2; | |
837 | req->r_locked_dir = dir; | |
838 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
839 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
840 | req->r_inode_drop = drop_caps_for_unlink(inode); | |
841 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
842 | if (!err && !req->r_reply_info.head->is_dentry) | |
843 | d_delete(dentry); | |
844 | ceph_mdsc_put_request(req); | |
845 | out: | |
846 | return err; | |
847 | } | |
848 | ||
849 | static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry, | |
850 | struct inode *new_dir, struct dentry *new_dentry) | |
851 | { | |
852 | struct ceph_client *client = ceph_sb_to_client(old_dir->i_sb); | |
853 | struct ceph_mds_client *mdsc = &client->mdsc; | |
854 | struct ceph_mds_request *req; | |
855 | int err; | |
856 | ||
857 | if (ceph_snap(old_dir) != ceph_snap(new_dir)) | |
858 | return -EXDEV; | |
859 | if (ceph_snap(old_dir) != CEPH_NOSNAP || | |
860 | ceph_snap(new_dir) != CEPH_NOSNAP) | |
861 | return -EROFS; | |
862 | dout("rename dir %p dentry %p to dir %p dentry %p\n", | |
863 | old_dir, old_dentry, new_dir, new_dentry); | |
864 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RENAME, USE_AUTH_MDS); | |
865 | if (IS_ERR(req)) | |
866 | return PTR_ERR(req); | |
867 | req->r_dentry = dget(new_dentry); | |
868 | req->r_num_caps = 2; | |
869 | req->r_old_dentry = dget(old_dentry); | |
870 | req->r_locked_dir = new_dir; | |
871 | req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED; | |
872 | req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL; | |
873 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
874 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
875 | /* release LINK_RDCACHE on source inode (mds will lock it) */ | |
876 | req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; | |
877 | if (new_dentry->d_inode) | |
878 | req->r_inode_drop = drop_caps_for_unlink(new_dentry->d_inode); | |
879 | err = ceph_mdsc_do_request(mdsc, old_dir, req); | |
880 | if (!err && !req->r_reply_info.head->is_dentry) { | |
881 | /* | |
882 | * Normally d_move() is done by fill_trace (called by | |
883 | * do_request, above). If there is no trace, we need | |
884 | * to do it here. | |
885 | */ | |
ea1409f9 SW |
886 | |
887 | /* d_move screws up d_subdirs order */ | |
888 | ceph_i_clear(new_dir, CEPH_I_COMPLETE); | |
889 | ||
2817b000 | 890 | d_move(old_dentry, new_dentry); |
ea1409f9 SW |
891 | |
892 | /* ensure target dentry is invalidated, despite | |
893 | rehashing bug in vfs_rename_dir */ | |
81a6cf2d | 894 | ceph_invalidate_dentry_lease(new_dentry); |
2817b000 SW |
895 | } |
896 | ceph_mdsc_put_request(req); | |
897 | return err; | |
898 | } | |
899 | ||
81a6cf2d SW |
900 | /* |
901 | * Ensure a dentry lease will no longer revalidate. | |
902 | */ | |
903 | void ceph_invalidate_dentry_lease(struct dentry *dentry) | |
904 | { | |
905 | spin_lock(&dentry->d_lock); | |
906 | dentry->d_time = jiffies; | |
907 | ceph_dentry(dentry)->lease_shared_gen = 0; | |
908 | spin_unlock(&dentry->d_lock); | |
909 | } | |
2817b000 SW |
910 | |
911 | /* | |
912 | * Check if dentry lease is valid. If not, delete the lease. Try to | |
913 | * renew if the least is more than half up. | |
914 | */ | |
915 | static int dentry_lease_is_valid(struct dentry *dentry) | |
916 | { | |
917 | struct ceph_dentry_info *di; | |
918 | struct ceph_mds_session *s; | |
919 | int valid = 0; | |
920 | u32 gen; | |
921 | unsigned long ttl; | |
922 | struct ceph_mds_session *session = NULL; | |
923 | struct inode *dir = NULL; | |
924 | u32 seq = 0; | |
925 | ||
926 | spin_lock(&dentry->d_lock); | |
927 | di = ceph_dentry(dentry); | |
928 | if (di && di->lease_session) { | |
929 | s = di->lease_session; | |
930 | spin_lock(&s->s_cap_lock); | |
931 | gen = s->s_cap_gen; | |
932 | ttl = s->s_cap_ttl; | |
933 | spin_unlock(&s->s_cap_lock); | |
934 | ||
935 | if (di->lease_gen == gen && | |
936 | time_before(jiffies, dentry->d_time) && | |
937 | time_before(jiffies, ttl)) { | |
938 | valid = 1; | |
939 | if (di->lease_renew_after && | |
940 | time_after(jiffies, di->lease_renew_after)) { | |
941 | /* we should renew */ | |
942 | dir = dentry->d_parent->d_inode; | |
943 | session = ceph_get_mds_session(s); | |
944 | seq = di->lease_seq; | |
945 | di->lease_renew_after = 0; | |
946 | di->lease_renew_from = jiffies; | |
947 | } | |
2817b000 SW |
948 | } |
949 | } | |
950 | spin_unlock(&dentry->d_lock); | |
951 | ||
952 | if (session) { | |
953 | ceph_mdsc_lease_send_msg(session, dir, dentry, | |
954 | CEPH_MDS_LEASE_RENEW, seq); | |
955 | ceph_put_mds_session(session); | |
956 | } | |
957 | dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid); | |
958 | return valid; | |
959 | } | |
960 | ||
961 | /* | |
962 | * Check if directory-wide content lease/cap is valid. | |
963 | */ | |
964 | static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry) | |
965 | { | |
966 | struct ceph_inode_info *ci = ceph_inode(dir); | |
967 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
968 | int valid = 0; | |
969 | ||
970 | spin_lock(&dir->i_lock); | |
971 | if (ci->i_shared_gen == di->lease_shared_gen) | |
972 | valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1); | |
973 | spin_unlock(&dir->i_lock); | |
974 | dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n", | |
975 | dir, (unsigned)ci->i_shared_gen, dentry, | |
976 | (unsigned)di->lease_shared_gen, valid); | |
977 | return valid; | |
978 | } | |
979 | ||
980 | /* | |
981 | * Check if cached dentry can be trusted. | |
982 | */ | |
983 | static int ceph_d_revalidate(struct dentry *dentry, struct nameidata *nd) | |
984 | { | |
985 | struct inode *dir = dentry->d_parent->d_inode; | |
986 | ||
987 | dout("d_revalidate %p '%.*s' inode %p\n", dentry, | |
988 | dentry->d_name.len, dentry->d_name.name, dentry->d_inode); | |
989 | ||
990 | /* always trust cached snapped dentries, snapdir dentry */ | |
991 | if (ceph_snap(dir) != CEPH_NOSNAP) { | |
992 | dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry, | |
993 | dentry->d_name.len, dentry->d_name.name, dentry->d_inode); | |
994 | goto out_touch; | |
995 | } | |
996 | if (dentry->d_inode && ceph_snap(dentry->d_inode) == CEPH_SNAPDIR) | |
997 | goto out_touch; | |
998 | ||
999 | if (dentry_lease_is_valid(dentry) || | |
1000 | dir_lease_is_valid(dir, dentry)) | |
1001 | goto out_touch; | |
1002 | ||
1003 | dout("d_revalidate %p invalid\n", dentry); | |
1004 | d_drop(dentry); | |
1005 | return 0; | |
1006 | out_touch: | |
1007 | ceph_dentry_lru_touch(dentry); | |
1008 | return 1; | |
1009 | } | |
1010 | ||
1011 | /* | |
1012 | * When a dentry is released, clear the dir I_COMPLETE if it was part | |
1013 | * of the current dir gen. | |
1014 | */ | |
1015 | static void ceph_dentry_release(struct dentry *dentry) | |
1016 | { | |
1017 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
1018 | struct inode *parent_inode = dentry->d_parent->d_inode; | |
1019 | ||
1020 | if (parent_inode) { | |
1021 | struct ceph_inode_info *ci = ceph_inode(parent_inode); | |
1022 | ||
1023 | spin_lock(&parent_inode->i_lock); | |
1024 | if (ci->i_shared_gen == di->lease_shared_gen) { | |
1025 | dout(" clearing %p complete (d_release)\n", | |
1026 | parent_inode); | |
1027 | ci->i_ceph_flags &= ~CEPH_I_COMPLETE; | |
1028 | ci->i_release_count++; | |
1029 | } | |
1030 | spin_unlock(&parent_inode->i_lock); | |
1031 | } | |
1032 | if (di) { | |
1033 | ceph_dentry_lru_del(dentry); | |
1034 | if (di->lease_session) | |
1035 | ceph_put_mds_session(di->lease_session); | |
1036 | kmem_cache_free(ceph_dentry_cachep, di); | |
1037 | dentry->d_fsdata = NULL; | |
1038 | } | |
1039 | } | |
1040 | ||
1041 | static int ceph_snapdir_d_revalidate(struct dentry *dentry, | |
1042 | struct nameidata *nd) | |
1043 | { | |
1044 | /* | |
1045 | * Eventually, we'll want to revalidate snapped metadata | |
1046 | * too... probably... | |
1047 | */ | |
1048 | return 1; | |
1049 | } | |
1050 | ||
1051 | ||
1052 | ||
1053 | /* | |
1054 | * read() on a dir. This weird interface hack only works if mounted | |
1055 | * with '-o dirstat'. | |
1056 | */ | |
1057 | static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, | |
1058 | loff_t *ppos) | |
1059 | { | |
1060 | struct ceph_file_info *cf = file->private_data; | |
1061 | struct inode *inode = file->f_dentry->d_inode; | |
1062 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1063 | int left; | |
1064 | ||
640ef79d | 1065 | if (!ceph_test_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT)) |
2817b000 SW |
1066 | return -EISDIR; |
1067 | ||
1068 | if (!cf->dir_info) { | |
1069 | cf->dir_info = kmalloc(1024, GFP_NOFS); | |
1070 | if (!cf->dir_info) | |
1071 | return -ENOMEM; | |
1072 | cf->dir_info_len = | |
1073 | sprintf(cf->dir_info, | |
1074 | "entries: %20lld\n" | |
1075 | " files: %20lld\n" | |
1076 | " subdirs: %20lld\n" | |
1077 | "rentries: %20lld\n" | |
1078 | " rfiles: %20lld\n" | |
1079 | " rsubdirs: %20lld\n" | |
1080 | "rbytes: %20lld\n" | |
1081 | "rctime: %10ld.%09ld\n", | |
1082 | ci->i_files + ci->i_subdirs, | |
1083 | ci->i_files, | |
1084 | ci->i_subdirs, | |
1085 | ci->i_rfiles + ci->i_rsubdirs, | |
1086 | ci->i_rfiles, | |
1087 | ci->i_rsubdirs, | |
1088 | ci->i_rbytes, | |
1089 | (long)ci->i_rctime.tv_sec, | |
1090 | (long)ci->i_rctime.tv_nsec); | |
1091 | } | |
1092 | ||
1093 | if (*ppos >= cf->dir_info_len) | |
1094 | return 0; | |
1095 | size = min_t(unsigned, size, cf->dir_info_len-*ppos); | |
1096 | left = copy_to_user(buf, cf->dir_info + *ppos, size); | |
1097 | if (left == size) | |
1098 | return -EFAULT; | |
1099 | *ppos += (size - left); | |
1100 | return size - left; | |
1101 | } | |
1102 | ||
1103 | /* | |
1104 | * an fsync() on a dir will wait for any uncommitted directory | |
1105 | * operations to commit. | |
1106 | */ | |
1107 | static int ceph_dir_fsync(struct file *file, struct dentry *dentry, | |
1108 | int datasync) | |
1109 | { | |
1110 | struct inode *inode = dentry->d_inode; | |
1111 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1112 | struct list_head *head = &ci->i_unsafe_dirops; | |
1113 | struct ceph_mds_request *req; | |
1114 | u64 last_tid; | |
1115 | int ret = 0; | |
1116 | ||
1117 | dout("dir_fsync %p\n", inode); | |
1118 | spin_lock(&ci->i_unsafe_lock); | |
1119 | if (list_empty(head)) | |
1120 | goto out; | |
1121 | ||
1122 | req = list_entry(head->prev, | |
1123 | struct ceph_mds_request, r_unsafe_dir_item); | |
1124 | last_tid = req->r_tid; | |
1125 | ||
1126 | do { | |
1127 | ceph_mdsc_get_request(req); | |
1128 | spin_unlock(&ci->i_unsafe_lock); | |
1129 | dout("dir_fsync %p wait on tid %llu (until %llu)\n", | |
1130 | inode, req->r_tid, last_tid); | |
1131 | if (req->r_timeout) { | |
1132 | ret = wait_for_completion_timeout( | |
1133 | &req->r_safe_completion, req->r_timeout); | |
1134 | if (ret > 0) | |
1135 | ret = 0; | |
1136 | else if (ret == 0) | |
1137 | ret = -EIO; /* timed out */ | |
1138 | } else { | |
1139 | wait_for_completion(&req->r_safe_completion); | |
1140 | } | |
1141 | spin_lock(&ci->i_unsafe_lock); | |
1142 | ceph_mdsc_put_request(req); | |
1143 | ||
1144 | if (ret || list_empty(head)) | |
1145 | break; | |
1146 | req = list_entry(head->next, | |
1147 | struct ceph_mds_request, r_unsafe_dir_item); | |
1148 | } while (req->r_tid < last_tid); | |
1149 | out: | |
1150 | spin_unlock(&ci->i_unsafe_lock); | |
1151 | return ret; | |
1152 | } | |
1153 | ||
1154 | /* | |
1155 | * We maintain a private dentry LRU. | |
1156 | * | |
1157 | * FIXME: this needs to be changed to a per-mds lru to be useful. | |
1158 | */ | |
1159 | void ceph_dentry_lru_add(struct dentry *dn) | |
1160 | { | |
1161 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1162 | struct ceph_mds_client *mdsc; | |
2817b000 | 1163 | |
04a419f9 SW |
1164 | dout("dentry_lru_add %p %p '%.*s'\n", di, dn, |
1165 | dn->d_name.len, dn->d_name.name); | |
2817b000 | 1166 | if (di) { |
640ef79d | 1167 | mdsc = &ceph_sb_to_client(dn->d_sb)->mdsc; |
2817b000 SW |
1168 | spin_lock(&mdsc->dentry_lru_lock); |
1169 | list_add_tail(&di->lru, &mdsc->dentry_lru); | |
1170 | mdsc->num_dentry++; | |
1171 | spin_unlock(&mdsc->dentry_lru_lock); | |
1172 | } | |
1173 | } | |
1174 | ||
1175 | void ceph_dentry_lru_touch(struct dentry *dn) | |
1176 | { | |
1177 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1178 | struct ceph_mds_client *mdsc; | |
2817b000 | 1179 | |
04a419f9 SW |
1180 | dout("dentry_lru_touch %p %p '%.*s'\n", di, dn, |
1181 | dn->d_name.len, dn->d_name.name); | |
2817b000 | 1182 | if (di) { |
640ef79d | 1183 | mdsc = &ceph_sb_to_client(dn->d_sb)->mdsc; |
2817b000 SW |
1184 | spin_lock(&mdsc->dentry_lru_lock); |
1185 | list_move_tail(&di->lru, &mdsc->dentry_lru); | |
1186 | spin_unlock(&mdsc->dentry_lru_lock); | |
1187 | } | |
1188 | } | |
1189 | ||
1190 | void ceph_dentry_lru_del(struct dentry *dn) | |
1191 | { | |
1192 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1193 | struct ceph_mds_client *mdsc; | |
1194 | ||
04a419f9 SW |
1195 | dout("dentry_lru_del %p %p '%.*s'\n", di, dn, |
1196 | dn->d_name.len, dn->d_name.name); | |
2817b000 | 1197 | if (di) { |
640ef79d | 1198 | mdsc = &ceph_sb_to_client(dn->d_sb)->mdsc; |
2817b000 SW |
1199 | spin_lock(&mdsc->dentry_lru_lock); |
1200 | list_del_init(&di->lru); | |
1201 | mdsc->num_dentry--; | |
1202 | spin_unlock(&mdsc->dentry_lru_lock); | |
1203 | } | |
1204 | } | |
1205 | ||
1206 | const struct file_operations ceph_dir_fops = { | |
1207 | .read = ceph_read_dir, | |
1208 | .readdir = ceph_readdir, | |
1209 | .llseek = ceph_dir_llseek, | |
1210 | .open = ceph_open, | |
1211 | .release = ceph_release, | |
1212 | .unlocked_ioctl = ceph_ioctl, | |
1213 | .fsync = ceph_dir_fsync, | |
1214 | }; | |
1215 | ||
1216 | const struct inode_operations ceph_dir_iops = { | |
1217 | .lookup = ceph_lookup, | |
1218 | .permission = ceph_permission, | |
1219 | .getattr = ceph_getattr, | |
1220 | .setattr = ceph_setattr, | |
1221 | .setxattr = ceph_setxattr, | |
1222 | .getxattr = ceph_getxattr, | |
1223 | .listxattr = ceph_listxattr, | |
1224 | .removexattr = ceph_removexattr, | |
1225 | .mknod = ceph_mknod, | |
1226 | .symlink = ceph_symlink, | |
1227 | .mkdir = ceph_mkdir, | |
1228 | .link = ceph_link, | |
1229 | .unlink = ceph_unlink, | |
1230 | .rmdir = ceph_unlink, | |
1231 | .rename = ceph_rename, | |
1232 | .create = ceph_create, | |
1233 | }; | |
1234 | ||
1235 | struct dentry_operations ceph_dentry_ops = { | |
1236 | .d_revalidate = ceph_d_revalidate, | |
1237 | .d_release = ceph_dentry_release, | |
1238 | }; | |
1239 | ||
1240 | struct dentry_operations ceph_snapdir_dentry_ops = { | |
1241 | .d_revalidate = ceph_snapdir_d_revalidate, | |
1242 | }; | |
1243 | ||
1244 | struct dentry_operations ceph_snap_dentry_ops = { | |
1245 | }; |