]>
Commit | Line | Data |
---|---|---|
1 | #include <linux/ceph/ceph_debug.h> | |
2 | ||
3 | #include <linux/spinlock.h> | |
4 | #include <linux/fs_struct.h> | |
5 | #include <linux/namei.h> | |
6 | #include <linux/slab.h> | |
7 | #include <linux/sched.h> | |
8 | #include <linux/xattr.h> | |
9 | ||
10 | #include "super.h" | |
11 | #include "mds_client.h" | |
12 | ||
13 | /* | |
14 | * Directory operations: readdir, lookup, create, link, unlink, | |
15 | * rename, etc. | |
16 | */ | |
17 | ||
18 | /* | |
19 | * Ceph MDS operations are specified in terms of a base ino and | |
20 | * relative path. Thus, the client can specify an operation on a | |
21 | * specific inode (e.g., a getattr due to fstat(2)), or as a path | |
22 | * relative to, say, the root directory. | |
23 | * | |
24 | * Normally, we limit ourselves to strict inode ops (no path component) | |
25 | * or dentry operations (a single path component relative to an ino). The | |
26 | * exception to this is open_root_dentry(), which will open the mount | |
27 | * point by name. | |
28 | */ | |
29 | ||
30 | const struct dentry_operations ceph_dentry_ops; | |
31 | ||
32 | /* | |
33 | * Initialize ceph dentry state. | |
34 | */ | |
35 | static int ceph_d_init(struct dentry *dentry) | |
36 | { | |
37 | struct ceph_dentry_info *di; | |
38 | ||
39 | di = kmem_cache_zalloc(ceph_dentry_cachep, GFP_KERNEL); | |
40 | if (!di) | |
41 | return -ENOMEM; /* oh well */ | |
42 | ||
43 | di->dentry = dentry; | |
44 | di->lease_session = NULL; | |
45 | di->time = jiffies; | |
46 | dentry->d_fsdata = di; | |
47 | ceph_dentry_lru_add(dentry); | |
48 | return 0; | |
49 | } | |
50 | ||
51 | /* | |
52 | * for f_pos for readdir: | |
53 | * - hash order: | |
54 | * (0xff << 52) | ((24 bits hash) << 28) | | |
55 | * (the nth entry has hash collision); | |
56 | * - frag+name order; | |
57 | * ((frag value) << 28) | (the nth entry in frag); | |
58 | */ | |
59 | #define OFFSET_BITS 28 | |
60 | #define OFFSET_MASK ((1 << OFFSET_BITS) - 1) | |
61 | #define HASH_ORDER (0xffull << (OFFSET_BITS + 24)) | |
62 | loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order) | |
63 | { | |
64 | loff_t fpos = ((loff_t)high << 28) | (loff_t)off; | |
65 | if (hash_order) | |
66 | fpos |= HASH_ORDER; | |
67 | return fpos; | |
68 | } | |
69 | ||
70 | static bool is_hash_order(loff_t p) | |
71 | { | |
72 | return (p & HASH_ORDER) == HASH_ORDER; | |
73 | } | |
74 | ||
75 | static unsigned fpos_frag(loff_t p) | |
76 | { | |
77 | return p >> OFFSET_BITS; | |
78 | } | |
79 | ||
80 | static unsigned fpos_hash(loff_t p) | |
81 | { | |
82 | return ceph_frag_value(fpos_frag(p)); | |
83 | } | |
84 | ||
85 | static unsigned fpos_off(loff_t p) | |
86 | { | |
87 | return p & OFFSET_MASK; | |
88 | } | |
89 | ||
90 | static int fpos_cmp(loff_t l, loff_t r) | |
91 | { | |
92 | int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r)); | |
93 | if (v) | |
94 | return v; | |
95 | return (int)(fpos_off(l) - fpos_off(r)); | |
96 | } | |
97 | ||
98 | /* | |
99 | * make note of the last dentry we read, so we can | |
100 | * continue at the same lexicographical point, | |
101 | * regardless of what dir changes take place on the | |
102 | * server. | |
103 | */ | |
104 | static int note_last_dentry(struct ceph_file_info *fi, const char *name, | |
105 | int len, unsigned next_offset) | |
106 | { | |
107 | char *buf = kmalloc(len+1, GFP_KERNEL); | |
108 | if (!buf) | |
109 | return -ENOMEM; | |
110 | kfree(fi->last_name); | |
111 | fi->last_name = buf; | |
112 | memcpy(fi->last_name, name, len); | |
113 | fi->last_name[len] = 0; | |
114 | fi->next_offset = next_offset; | |
115 | dout("note_last_dentry '%s'\n", fi->last_name); | |
116 | return 0; | |
117 | } | |
118 | ||
119 | ||
120 | static struct dentry * | |
121 | __dcache_find_get_entry(struct dentry *parent, u64 idx, | |
122 | struct ceph_readdir_cache_control *cache_ctl) | |
123 | { | |
124 | struct inode *dir = d_inode(parent); | |
125 | struct dentry *dentry; | |
126 | unsigned idx_mask = (PAGE_SIZE / sizeof(struct dentry *)) - 1; | |
127 | loff_t ptr_pos = idx * sizeof(struct dentry *); | |
128 | pgoff_t ptr_pgoff = ptr_pos >> PAGE_SHIFT; | |
129 | ||
130 | if (ptr_pos >= i_size_read(dir)) | |
131 | return NULL; | |
132 | ||
133 | if (!cache_ctl->page || ptr_pgoff != page_index(cache_ctl->page)) { | |
134 | ceph_readdir_cache_release(cache_ctl); | |
135 | cache_ctl->page = find_lock_page(&dir->i_data, ptr_pgoff); | |
136 | if (!cache_ctl->page) { | |
137 | dout(" page %lu not found\n", ptr_pgoff); | |
138 | return ERR_PTR(-EAGAIN); | |
139 | } | |
140 | /* reading/filling the cache are serialized by | |
141 | i_mutex, no need to use page lock */ | |
142 | unlock_page(cache_ctl->page); | |
143 | cache_ctl->dentries = kmap(cache_ctl->page); | |
144 | } | |
145 | ||
146 | cache_ctl->index = idx & idx_mask; | |
147 | ||
148 | rcu_read_lock(); | |
149 | spin_lock(&parent->d_lock); | |
150 | /* check i_size again here, because empty directory can be | |
151 | * marked as complete while not holding the i_mutex. */ | |
152 | if (ceph_dir_is_complete_ordered(dir) && ptr_pos < i_size_read(dir)) | |
153 | dentry = cache_ctl->dentries[cache_ctl->index]; | |
154 | else | |
155 | dentry = NULL; | |
156 | spin_unlock(&parent->d_lock); | |
157 | if (dentry && !lockref_get_not_dead(&dentry->d_lockref)) | |
158 | dentry = NULL; | |
159 | rcu_read_unlock(); | |
160 | return dentry ? : ERR_PTR(-EAGAIN); | |
161 | } | |
162 | ||
163 | /* | |
164 | * When possible, we try to satisfy a readdir by peeking at the | |
165 | * dcache. We make this work by carefully ordering dentries on | |
166 | * d_child when we initially get results back from the MDS, and | |
167 | * falling back to a "normal" sync readdir if any dentries in the dir | |
168 | * are dropped. | |
169 | * | |
170 | * Complete dir indicates that we have all dentries in the dir. It is | |
171 | * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by | |
172 | * the MDS if/when the directory is modified). | |
173 | */ | |
174 | static int __dcache_readdir(struct file *file, struct dir_context *ctx, | |
175 | u32 shared_gen) | |
176 | { | |
177 | struct ceph_file_info *fi = file->private_data; | |
178 | struct dentry *parent = file->f_path.dentry; | |
179 | struct inode *dir = d_inode(parent); | |
180 | struct dentry *dentry, *last = NULL; | |
181 | struct ceph_dentry_info *di; | |
182 | struct ceph_readdir_cache_control cache_ctl = {}; | |
183 | u64 idx = 0; | |
184 | int err = 0; | |
185 | ||
186 | dout("__dcache_readdir %p v%u at %llx\n", dir, shared_gen, ctx->pos); | |
187 | ||
188 | /* search start position */ | |
189 | if (ctx->pos > 2) { | |
190 | u64 count = div_u64(i_size_read(dir), sizeof(struct dentry *)); | |
191 | while (count > 0) { | |
192 | u64 step = count >> 1; | |
193 | dentry = __dcache_find_get_entry(parent, idx + step, | |
194 | &cache_ctl); | |
195 | if (!dentry) { | |
196 | /* use linar search */ | |
197 | idx = 0; | |
198 | break; | |
199 | } | |
200 | if (IS_ERR(dentry)) { | |
201 | err = PTR_ERR(dentry); | |
202 | goto out; | |
203 | } | |
204 | di = ceph_dentry(dentry); | |
205 | spin_lock(&dentry->d_lock); | |
206 | if (fpos_cmp(di->offset, ctx->pos) < 0) { | |
207 | idx += step + 1; | |
208 | count -= step + 1; | |
209 | } else { | |
210 | count = step; | |
211 | } | |
212 | spin_unlock(&dentry->d_lock); | |
213 | dput(dentry); | |
214 | } | |
215 | ||
216 | dout("__dcache_readdir %p cache idx %llu\n", dir, idx); | |
217 | } | |
218 | ||
219 | ||
220 | for (;;) { | |
221 | bool emit_dentry = false; | |
222 | dentry = __dcache_find_get_entry(parent, idx++, &cache_ctl); | |
223 | if (!dentry) { | |
224 | fi->flags |= CEPH_F_ATEND; | |
225 | err = 0; | |
226 | break; | |
227 | } | |
228 | if (IS_ERR(dentry)) { | |
229 | err = PTR_ERR(dentry); | |
230 | goto out; | |
231 | } | |
232 | ||
233 | di = ceph_dentry(dentry); | |
234 | spin_lock(&dentry->d_lock); | |
235 | if (di->lease_shared_gen == shared_gen && | |
236 | d_really_is_positive(dentry) && | |
237 | fpos_cmp(ctx->pos, di->offset) <= 0) { | |
238 | emit_dentry = true; | |
239 | } | |
240 | spin_unlock(&dentry->d_lock); | |
241 | ||
242 | if (emit_dentry) { | |
243 | dout(" %llx dentry %p %pd %p\n", di->offset, | |
244 | dentry, dentry, d_inode(dentry)); | |
245 | ctx->pos = di->offset; | |
246 | if (!dir_emit(ctx, dentry->d_name.name, | |
247 | dentry->d_name.len, | |
248 | ceph_translate_ino(dentry->d_sb, | |
249 | d_inode(dentry)->i_ino), | |
250 | d_inode(dentry)->i_mode >> 12)) { | |
251 | dput(dentry); | |
252 | err = 0; | |
253 | break; | |
254 | } | |
255 | ctx->pos++; | |
256 | ||
257 | if (last) | |
258 | dput(last); | |
259 | last = dentry; | |
260 | } else { | |
261 | dput(dentry); | |
262 | } | |
263 | } | |
264 | out: | |
265 | ceph_readdir_cache_release(&cache_ctl); | |
266 | if (last) { | |
267 | int ret; | |
268 | di = ceph_dentry(last); | |
269 | ret = note_last_dentry(fi, last->d_name.name, last->d_name.len, | |
270 | fpos_off(di->offset) + 1); | |
271 | if (ret < 0) | |
272 | err = ret; | |
273 | dput(last); | |
274 | } | |
275 | return err; | |
276 | } | |
277 | ||
278 | static bool need_send_readdir(struct ceph_file_info *fi, loff_t pos) | |
279 | { | |
280 | if (!fi->last_readdir) | |
281 | return true; | |
282 | if (is_hash_order(pos)) | |
283 | return !ceph_frag_contains_value(fi->frag, fpos_hash(pos)); | |
284 | else | |
285 | return fi->frag != fpos_frag(pos); | |
286 | } | |
287 | ||
288 | static int ceph_readdir(struct file *file, struct dir_context *ctx) | |
289 | { | |
290 | struct ceph_file_info *fi = file->private_data; | |
291 | struct inode *inode = file_inode(file); | |
292 | struct ceph_inode_info *ci = ceph_inode(inode); | |
293 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); | |
294 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
295 | int i; | |
296 | int err; | |
297 | u32 ftype; | |
298 | struct ceph_mds_reply_info_parsed *rinfo; | |
299 | ||
300 | dout("readdir %p file %p pos %llx\n", inode, file, ctx->pos); | |
301 | if (fi->flags & CEPH_F_ATEND) | |
302 | return 0; | |
303 | ||
304 | /* always start with . and .. */ | |
305 | if (ctx->pos == 0) { | |
306 | dout("readdir off 0 -> '.'\n"); | |
307 | if (!dir_emit(ctx, ".", 1, | |
308 | ceph_translate_ino(inode->i_sb, inode->i_ino), | |
309 | inode->i_mode >> 12)) | |
310 | return 0; | |
311 | ctx->pos = 1; | |
312 | } | |
313 | if (ctx->pos == 1) { | |
314 | ino_t ino = parent_ino(file->f_path.dentry); | |
315 | dout("readdir off 1 -> '..'\n"); | |
316 | if (!dir_emit(ctx, "..", 2, | |
317 | ceph_translate_ino(inode->i_sb, ino), | |
318 | inode->i_mode >> 12)) | |
319 | return 0; | |
320 | ctx->pos = 2; | |
321 | } | |
322 | ||
323 | /* can we use the dcache? */ | |
324 | spin_lock(&ci->i_ceph_lock); | |
325 | if (ceph_test_mount_opt(fsc, DCACHE) && | |
326 | !ceph_test_mount_opt(fsc, NOASYNCREADDIR) && | |
327 | ceph_snap(inode) != CEPH_SNAPDIR && | |
328 | __ceph_dir_is_complete_ordered(ci) && | |
329 | __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) { | |
330 | u32 shared_gen = ci->i_shared_gen; | |
331 | spin_unlock(&ci->i_ceph_lock); | |
332 | err = __dcache_readdir(file, ctx, shared_gen); | |
333 | if (err != -EAGAIN) | |
334 | return err; | |
335 | } else { | |
336 | spin_unlock(&ci->i_ceph_lock); | |
337 | } | |
338 | ||
339 | /* proceed with a normal readdir */ | |
340 | more: | |
341 | /* do we have the correct frag content buffered? */ | |
342 | if (need_send_readdir(fi, ctx->pos)) { | |
343 | struct ceph_mds_request *req; | |
344 | unsigned frag; | |
345 | int op = ceph_snap(inode) == CEPH_SNAPDIR ? | |
346 | CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR; | |
347 | ||
348 | /* discard old result, if any */ | |
349 | if (fi->last_readdir) { | |
350 | ceph_mdsc_put_request(fi->last_readdir); | |
351 | fi->last_readdir = NULL; | |
352 | } | |
353 | ||
354 | if (is_hash_order(ctx->pos)) { | |
355 | frag = ceph_choose_frag(ci, fpos_hash(ctx->pos), | |
356 | NULL, NULL); | |
357 | } else { | |
358 | frag = fpos_frag(ctx->pos); | |
359 | } | |
360 | ||
361 | dout("readdir fetching %llx.%llx frag %x offset '%s'\n", | |
362 | ceph_vinop(inode), frag, fi->last_name); | |
363 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
364 | if (IS_ERR(req)) | |
365 | return PTR_ERR(req); | |
366 | err = ceph_alloc_readdir_reply_buffer(req, inode); | |
367 | if (err) { | |
368 | ceph_mdsc_put_request(req); | |
369 | return err; | |
370 | } | |
371 | /* hints to request -> mds selection code */ | |
372 | req->r_direct_mode = USE_AUTH_MDS; | |
373 | req->r_direct_hash = ceph_frag_value(frag); | |
374 | __set_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags); | |
375 | if (fi->last_name) { | |
376 | req->r_path2 = kstrdup(fi->last_name, GFP_KERNEL); | |
377 | if (!req->r_path2) { | |
378 | ceph_mdsc_put_request(req); | |
379 | return -ENOMEM; | |
380 | } | |
381 | } | |
382 | req->r_dir_release_cnt = fi->dir_release_count; | |
383 | req->r_dir_ordered_cnt = fi->dir_ordered_count; | |
384 | req->r_readdir_cache_idx = fi->readdir_cache_idx; | |
385 | req->r_readdir_offset = fi->next_offset; | |
386 | req->r_args.readdir.frag = cpu_to_le32(frag); | |
387 | req->r_args.readdir.flags = | |
388 | cpu_to_le16(CEPH_READDIR_REPLY_BITFLAGS); | |
389 | ||
390 | req->r_inode = inode; | |
391 | ihold(inode); | |
392 | req->r_dentry = dget(file->f_path.dentry); | |
393 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
394 | if (err < 0) { | |
395 | ceph_mdsc_put_request(req); | |
396 | return err; | |
397 | } | |
398 | dout("readdir got and parsed readdir result=%d on " | |
399 | "frag %x, end=%d, complete=%d, hash_order=%d\n", | |
400 | err, frag, | |
401 | (int)req->r_reply_info.dir_end, | |
402 | (int)req->r_reply_info.dir_complete, | |
403 | (int)req->r_reply_info.hash_order); | |
404 | ||
405 | rinfo = &req->r_reply_info; | |
406 | if (le32_to_cpu(rinfo->dir_dir->frag) != frag) { | |
407 | frag = le32_to_cpu(rinfo->dir_dir->frag); | |
408 | if (!rinfo->hash_order) { | |
409 | fi->next_offset = req->r_readdir_offset; | |
410 | /* adjust ctx->pos to beginning of frag */ | |
411 | ctx->pos = ceph_make_fpos(frag, | |
412 | fi->next_offset, | |
413 | false); | |
414 | } | |
415 | } | |
416 | ||
417 | fi->frag = frag; | |
418 | fi->last_readdir = req; | |
419 | ||
420 | if (test_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags)) { | |
421 | fi->readdir_cache_idx = req->r_readdir_cache_idx; | |
422 | if (fi->readdir_cache_idx < 0) { | |
423 | /* preclude from marking dir ordered */ | |
424 | fi->dir_ordered_count = 0; | |
425 | } else if (ceph_frag_is_leftmost(frag) && | |
426 | fi->next_offset == 2) { | |
427 | /* note dir version at start of readdir so | |
428 | * we can tell if any dentries get dropped */ | |
429 | fi->dir_release_count = req->r_dir_release_cnt; | |
430 | fi->dir_ordered_count = req->r_dir_ordered_cnt; | |
431 | } | |
432 | } else { | |
433 | dout("readdir !did_prepopulate"); | |
434 | /* disable readdir cache */ | |
435 | fi->readdir_cache_idx = -1; | |
436 | /* preclude from marking dir complete */ | |
437 | fi->dir_release_count = 0; | |
438 | } | |
439 | ||
440 | /* note next offset and last dentry name */ | |
441 | if (rinfo->dir_nr > 0) { | |
442 | struct ceph_mds_reply_dir_entry *rde = | |
443 | rinfo->dir_entries + (rinfo->dir_nr-1); | |
444 | unsigned next_offset = req->r_reply_info.dir_end ? | |
445 | 2 : (fpos_off(rde->offset) + 1); | |
446 | err = note_last_dentry(fi, rde->name, rde->name_len, | |
447 | next_offset); | |
448 | if (err) | |
449 | return err; | |
450 | } else if (req->r_reply_info.dir_end) { | |
451 | fi->next_offset = 2; | |
452 | /* keep last name */ | |
453 | } | |
454 | } | |
455 | ||
456 | rinfo = &fi->last_readdir->r_reply_info; | |
457 | dout("readdir frag %x num %d pos %llx chunk first %llx\n", | |
458 | fi->frag, rinfo->dir_nr, ctx->pos, | |
459 | rinfo->dir_nr ? rinfo->dir_entries[0].offset : 0LL); | |
460 | ||
461 | i = 0; | |
462 | /* search start position */ | |
463 | if (rinfo->dir_nr > 0) { | |
464 | int step, nr = rinfo->dir_nr; | |
465 | while (nr > 0) { | |
466 | step = nr >> 1; | |
467 | if (rinfo->dir_entries[i + step].offset < ctx->pos) { | |
468 | i += step + 1; | |
469 | nr -= step + 1; | |
470 | } else { | |
471 | nr = step; | |
472 | } | |
473 | } | |
474 | } | |
475 | for (; i < rinfo->dir_nr; i++) { | |
476 | struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i; | |
477 | struct ceph_vino vino; | |
478 | ino_t ino; | |
479 | ||
480 | BUG_ON(rde->offset < ctx->pos); | |
481 | ||
482 | ctx->pos = rde->offset; | |
483 | dout("readdir (%d/%d) -> %llx '%.*s' %p\n", | |
484 | i, rinfo->dir_nr, ctx->pos, | |
485 | rde->name_len, rde->name, &rde->inode.in); | |
486 | ||
487 | BUG_ON(!rde->inode.in); | |
488 | ftype = le32_to_cpu(rde->inode.in->mode) >> 12; | |
489 | vino.ino = le64_to_cpu(rde->inode.in->ino); | |
490 | vino.snap = le64_to_cpu(rde->inode.in->snapid); | |
491 | ino = ceph_vino_to_ino(vino); | |
492 | ||
493 | if (!dir_emit(ctx, rde->name, rde->name_len, | |
494 | ceph_translate_ino(inode->i_sb, ino), ftype)) { | |
495 | dout("filldir stopping us...\n"); | |
496 | return 0; | |
497 | } | |
498 | ctx->pos++; | |
499 | } | |
500 | ||
501 | if (fi->next_offset > 2) { | |
502 | ceph_mdsc_put_request(fi->last_readdir); | |
503 | fi->last_readdir = NULL; | |
504 | goto more; | |
505 | } | |
506 | ||
507 | /* more frags? */ | |
508 | if (!ceph_frag_is_rightmost(fi->frag)) { | |
509 | unsigned frag = ceph_frag_next(fi->frag); | |
510 | if (is_hash_order(ctx->pos)) { | |
511 | loff_t new_pos = ceph_make_fpos(ceph_frag_value(frag), | |
512 | fi->next_offset, true); | |
513 | if (new_pos > ctx->pos) | |
514 | ctx->pos = new_pos; | |
515 | /* keep last_name */ | |
516 | } else { | |
517 | ctx->pos = ceph_make_fpos(frag, fi->next_offset, false); | |
518 | kfree(fi->last_name); | |
519 | fi->last_name = NULL; | |
520 | } | |
521 | dout("readdir next frag is %x\n", frag); | |
522 | goto more; | |
523 | } | |
524 | fi->flags |= CEPH_F_ATEND; | |
525 | ||
526 | /* | |
527 | * if dir_release_count still matches the dir, no dentries | |
528 | * were released during the whole readdir, and we should have | |
529 | * the complete dir contents in our cache. | |
530 | */ | |
531 | if (atomic64_read(&ci->i_release_count) == fi->dir_release_count) { | |
532 | spin_lock(&ci->i_ceph_lock); | |
533 | if (fi->dir_ordered_count == atomic64_read(&ci->i_ordered_count)) { | |
534 | dout(" marking %p complete and ordered\n", inode); | |
535 | /* use i_size to track number of entries in | |
536 | * readdir cache */ | |
537 | BUG_ON(fi->readdir_cache_idx < 0); | |
538 | i_size_write(inode, fi->readdir_cache_idx * | |
539 | sizeof(struct dentry*)); | |
540 | } else { | |
541 | dout(" marking %p complete\n", inode); | |
542 | } | |
543 | __ceph_dir_set_complete(ci, fi->dir_release_count, | |
544 | fi->dir_ordered_count); | |
545 | spin_unlock(&ci->i_ceph_lock); | |
546 | } | |
547 | ||
548 | dout("readdir %p file %p done.\n", inode, file); | |
549 | return 0; | |
550 | } | |
551 | ||
552 | static void reset_readdir(struct ceph_file_info *fi) | |
553 | { | |
554 | if (fi->last_readdir) { | |
555 | ceph_mdsc_put_request(fi->last_readdir); | |
556 | fi->last_readdir = NULL; | |
557 | } | |
558 | kfree(fi->last_name); | |
559 | fi->last_name = NULL; | |
560 | fi->dir_release_count = 0; | |
561 | fi->readdir_cache_idx = -1; | |
562 | fi->next_offset = 2; /* compensate for . and .. */ | |
563 | fi->flags &= ~CEPH_F_ATEND; | |
564 | } | |
565 | ||
566 | /* | |
567 | * discard buffered readdir content on seekdir(0), or seek to new frag, | |
568 | * or seek prior to current chunk | |
569 | */ | |
570 | static bool need_reset_readdir(struct ceph_file_info *fi, loff_t new_pos) | |
571 | { | |
572 | struct ceph_mds_reply_info_parsed *rinfo; | |
573 | loff_t chunk_offset; | |
574 | if (new_pos == 0) | |
575 | return true; | |
576 | if (is_hash_order(new_pos)) { | |
577 | /* no need to reset last_name for a forward seek when | |
578 | * dentries are sotred in hash order */ | |
579 | } else if (fi->frag != fpos_frag(new_pos)) { | |
580 | return true; | |
581 | } | |
582 | rinfo = fi->last_readdir ? &fi->last_readdir->r_reply_info : NULL; | |
583 | if (!rinfo || !rinfo->dir_nr) | |
584 | return true; | |
585 | chunk_offset = rinfo->dir_entries[0].offset; | |
586 | return new_pos < chunk_offset || | |
587 | is_hash_order(new_pos) != is_hash_order(chunk_offset); | |
588 | } | |
589 | ||
590 | static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence) | |
591 | { | |
592 | struct ceph_file_info *fi = file->private_data; | |
593 | struct inode *inode = file->f_mapping->host; | |
594 | loff_t retval; | |
595 | ||
596 | inode_lock(inode); | |
597 | retval = -EINVAL; | |
598 | switch (whence) { | |
599 | case SEEK_CUR: | |
600 | offset += file->f_pos; | |
601 | case SEEK_SET: | |
602 | break; | |
603 | case SEEK_END: | |
604 | retval = -EOPNOTSUPP; | |
605 | default: | |
606 | goto out; | |
607 | } | |
608 | ||
609 | if (offset >= 0) { | |
610 | if (need_reset_readdir(fi, offset)) { | |
611 | dout("dir_llseek dropping %p content\n", file); | |
612 | reset_readdir(fi); | |
613 | } else if (is_hash_order(offset) && offset > file->f_pos) { | |
614 | /* for hash offset, we don't know if a forward seek | |
615 | * is within same frag */ | |
616 | fi->dir_release_count = 0; | |
617 | fi->readdir_cache_idx = -1; | |
618 | } | |
619 | ||
620 | if (offset != file->f_pos) { | |
621 | file->f_pos = offset; | |
622 | file->f_version = 0; | |
623 | fi->flags &= ~CEPH_F_ATEND; | |
624 | } | |
625 | retval = offset; | |
626 | } | |
627 | out: | |
628 | inode_unlock(inode); | |
629 | return retval; | |
630 | } | |
631 | ||
632 | /* | |
633 | * Handle lookups for the hidden .snap directory. | |
634 | */ | |
635 | int ceph_handle_snapdir(struct ceph_mds_request *req, | |
636 | struct dentry *dentry, int err) | |
637 | { | |
638 | struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); | |
639 | struct inode *parent = d_inode(dentry->d_parent); /* we hold i_mutex */ | |
640 | ||
641 | /* .snap dir? */ | |
642 | if (err == -ENOENT && | |
643 | ceph_snap(parent) == CEPH_NOSNAP && | |
644 | strcmp(dentry->d_name.name, | |
645 | fsc->mount_options->snapdir_name) == 0) { | |
646 | struct inode *inode = ceph_get_snapdir(parent); | |
647 | dout("ENOENT on snapdir %p '%pd', linking to snapdir %p\n", | |
648 | dentry, dentry, inode); | |
649 | BUG_ON(!d_unhashed(dentry)); | |
650 | d_add(dentry, inode); | |
651 | err = 0; | |
652 | } | |
653 | return err; | |
654 | } | |
655 | ||
656 | /* | |
657 | * Figure out final result of a lookup/open request. | |
658 | * | |
659 | * Mainly, make sure we return the final req->r_dentry (if it already | |
660 | * existed) in place of the original VFS-provided dentry when they | |
661 | * differ. | |
662 | * | |
663 | * Gracefully handle the case where the MDS replies with -ENOENT and | |
664 | * no trace (which it may do, at its discretion, e.g., if it doesn't | |
665 | * care to issue a lease on the negative dentry). | |
666 | */ | |
667 | struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, | |
668 | struct dentry *dentry, int err) | |
669 | { | |
670 | if (err == -ENOENT) { | |
671 | /* no trace? */ | |
672 | err = 0; | |
673 | if (!req->r_reply_info.head->is_dentry) { | |
674 | dout("ENOENT and no trace, dentry %p inode %p\n", | |
675 | dentry, d_inode(dentry)); | |
676 | if (d_really_is_positive(dentry)) { | |
677 | d_drop(dentry); | |
678 | err = -ENOENT; | |
679 | } else { | |
680 | d_add(dentry, NULL); | |
681 | } | |
682 | } | |
683 | } | |
684 | if (err) | |
685 | dentry = ERR_PTR(err); | |
686 | else if (dentry != req->r_dentry) | |
687 | dentry = dget(req->r_dentry); /* we got spliced */ | |
688 | else | |
689 | dentry = NULL; | |
690 | return dentry; | |
691 | } | |
692 | ||
693 | static bool is_root_ceph_dentry(struct inode *inode, struct dentry *dentry) | |
694 | { | |
695 | return ceph_ino(inode) == CEPH_INO_ROOT && | |
696 | strncmp(dentry->d_name.name, ".ceph", 5) == 0; | |
697 | } | |
698 | ||
699 | /* | |
700 | * Look up a single dir entry. If there is a lookup intent, inform | |
701 | * the MDS so that it gets our 'caps wanted' value in a single op. | |
702 | */ | |
703 | static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry, | |
704 | unsigned int flags) | |
705 | { | |
706 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); | |
707 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
708 | struct ceph_mds_request *req; | |
709 | int op; | |
710 | int mask; | |
711 | int err; | |
712 | ||
713 | dout("lookup %p dentry %p '%pd'\n", | |
714 | dir, dentry, dentry); | |
715 | ||
716 | if (dentry->d_name.len > NAME_MAX) | |
717 | return ERR_PTR(-ENAMETOOLONG); | |
718 | ||
719 | /* can we conclude ENOENT locally? */ | |
720 | if (d_really_is_negative(dentry)) { | |
721 | struct ceph_inode_info *ci = ceph_inode(dir); | |
722 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
723 | ||
724 | spin_lock(&ci->i_ceph_lock); | |
725 | dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags); | |
726 | if (strncmp(dentry->d_name.name, | |
727 | fsc->mount_options->snapdir_name, | |
728 | dentry->d_name.len) && | |
729 | !is_root_ceph_dentry(dir, dentry) && | |
730 | ceph_test_mount_opt(fsc, DCACHE) && | |
731 | __ceph_dir_is_complete(ci) && | |
732 | (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) { | |
733 | spin_unlock(&ci->i_ceph_lock); | |
734 | dout(" dir %p complete, -ENOENT\n", dir); | |
735 | d_add(dentry, NULL); | |
736 | di->lease_shared_gen = ci->i_shared_gen; | |
737 | return NULL; | |
738 | } | |
739 | spin_unlock(&ci->i_ceph_lock); | |
740 | } | |
741 | ||
742 | op = ceph_snap(dir) == CEPH_SNAPDIR ? | |
743 | CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; | |
744 | req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); | |
745 | if (IS_ERR(req)) | |
746 | return ERR_CAST(req); | |
747 | req->r_dentry = dget(dentry); | |
748 | req->r_num_caps = 2; | |
749 | ||
750 | mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED; | |
751 | if (ceph_security_xattr_wanted(dir)) | |
752 | mask |= CEPH_CAP_XATTR_SHARED; | |
753 | req->r_args.getattr.mask = cpu_to_le32(mask); | |
754 | ||
755 | req->r_locked_dir = dir; | |
756 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
757 | err = ceph_handle_snapdir(req, dentry, err); | |
758 | dentry = ceph_finish_lookup(req, dentry, err); | |
759 | ceph_mdsc_put_request(req); /* will dput(dentry) */ | |
760 | dout("lookup result=%p\n", dentry); | |
761 | return dentry; | |
762 | } | |
763 | ||
764 | /* | |
765 | * If we do a create but get no trace back from the MDS, follow up with | |
766 | * a lookup (the VFS expects us to link up the provided dentry). | |
767 | */ | |
768 | int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry) | |
769 | { | |
770 | struct dentry *result = ceph_lookup(dir, dentry, 0); | |
771 | ||
772 | if (result && !IS_ERR(result)) { | |
773 | /* | |
774 | * We created the item, then did a lookup, and found | |
775 | * it was already linked to another inode we already | |
776 | * had in our cache (and thus got spliced). To not | |
777 | * confuse VFS (especially when inode is a directory), | |
778 | * we don't link our dentry to that inode, return an | |
779 | * error instead. | |
780 | * | |
781 | * This event should be rare and it happens only when | |
782 | * we talk to old MDS. Recent MDS does not send traceless | |
783 | * reply for request that creates new inode. | |
784 | */ | |
785 | d_drop(result); | |
786 | return -ESTALE; | |
787 | } | |
788 | return PTR_ERR(result); | |
789 | } | |
790 | ||
791 | static int ceph_mknod(struct inode *dir, struct dentry *dentry, | |
792 | umode_t mode, dev_t rdev) | |
793 | { | |
794 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); | |
795 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
796 | struct ceph_mds_request *req; | |
797 | struct ceph_acls_info acls = {}; | |
798 | int err; | |
799 | ||
800 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
801 | return -EROFS; | |
802 | ||
803 | err = ceph_pre_init_acls(dir, &mode, &acls); | |
804 | if (err < 0) | |
805 | return err; | |
806 | ||
807 | dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n", | |
808 | dir, dentry, mode, rdev); | |
809 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS); | |
810 | if (IS_ERR(req)) { | |
811 | err = PTR_ERR(req); | |
812 | goto out; | |
813 | } | |
814 | req->r_dentry = dget(dentry); | |
815 | req->r_num_caps = 2; | |
816 | req->r_locked_dir = dir; | |
817 | req->r_args.mknod.mode = cpu_to_le32(mode); | |
818 | req->r_args.mknod.rdev = cpu_to_le32(rdev); | |
819 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
820 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
821 | if (acls.pagelist) { | |
822 | req->r_pagelist = acls.pagelist; | |
823 | acls.pagelist = NULL; | |
824 | } | |
825 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
826 | if (!err && !req->r_reply_info.head->is_dentry) | |
827 | err = ceph_handle_notrace_create(dir, dentry); | |
828 | ceph_mdsc_put_request(req); | |
829 | out: | |
830 | if (!err) | |
831 | ceph_init_inode_acls(d_inode(dentry), &acls); | |
832 | else | |
833 | d_drop(dentry); | |
834 | ceph_release_acls_info(&acls); | |
835 | return err; | |
836 | } | |
837 | ||
838 | static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode, | |
839 | bool excl) | |
840 | { | |
841 | return ceph_mknod(dir, dentry, mode, 0); | |
842 | } | |
843 | ||
844 | static int ceph_symlink(struct inode *dir, struct dentry *dentry, | |
845 | const char *dest) | |
846 | { | |
847 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); | |
848 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
849 | struct ceph_mds_request *req; | |
850 | int err; | |
851 | ||
852 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
853 | return -EROFS; | |
854 | ||
855 | dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest); | |
856 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS); | |
857 | if (IS_ERR(req)) { | |
858 | err = PTR_ERR(req); | |
859 | goto out; | |
860 | } | |
861 | req->r_path2 = kstrdup(dest, GFP_KERNEL); | |
862 | if (!req->r_path2) { | |
863 | err = -ENOMEM; | |
864 | ceph_mdsc_put_request(req); | |
865 | goto out; | |
866 | } | |
867 | req->r_locked_dir = dir; | |
868 | req->r_dentry = dget(dentry); | |
869 | req->r_num_caps = 2; | |
870 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
871 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
872 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
873 | if (!err && !req->r_reply_info.head->is_dentry) | |
874 | err = ceph_handle_notrace_create(dir, dentry); | |
875 | ceph_mdsc_put_request(req); | |
876 | out: | |
877 | if (err) | |
878 | d_drop(dentry); | |
879 | return err; | |
880 | } | |
881 | ||
882 | static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) | |
883 | { | |
884 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); | |
885 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
886 | struct ceph_mds_request *req; | |
887 | struct ceph_acls_info acls = {}; | |
888 | int err = -EROFS; | |
889 | int op; | |
890 | ||
891 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
892 | /* mkdir .snap/foo is a MKSNAP */ | |
893 | op = CEPH_MDS_OP_MKSNAP; | |
894 | dout("mksnap dir %p snap '%pd' dn %p\n", dir, | |
895 | dentry, dentry); | |
896 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { | |
897 | dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode); | |
898 | op = CEPH_MDS_OP_MKDIR; | |
899 | } else { | |
900 | goto out; | |
901 | } | |
902 | ||
903 | mode |= S_IFDIR; | |
904 | err = ceph_pre_init_acls(dir, &mode, &acls); | |
905 | if (err < 0) | |
906 | goto out; | |
907 | ||
908 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
909 | if (IS_ERR(req)) { | |
910 | err = PTR_ERR(req); | |
911 | goto out; | |
912 | } | |
913 | ||
914 | req->r_dentry = dget(dentry); | |
915 | req->r_num_caps = 2; | |
916 | req->r_locked_dir = dir; | |
917 | req->r_args.mkdir.mode = cpu_to_le32(mode); | |
918 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
919 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
920 | if (acls.pagelist) { | |
921 | req->r_pagelist = acls.pagelist; | |
922 | acls.pagelist = NULL; | |
923 | } | |
924 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
925 | if (!err && | |
926 | !req->r_reply_info.head->is_target && | |
927 | !req->r_reply_info.head->is_dentry) | |
928 | err = ceph_handle_notrace_create(dir, dentry); | |
929 | ceph_mdsc_put_request(req); | |
930 | out: | |
931 | if (!err) | |
932 | ceph_init_inode_acls(d_inode(dentry), &acls); | |
933 | else | |
934 | d_drop(dentry); | |
935 | ceph_release_acls_info(&acls); | |
936 | return err; | |
937 | } | |
938 | ||
939 | static int ceph_link(struct dentry *old_dentry, struct inode *dir, | |
940 | struct dentry *dentry) | |
941 | { | |
942 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); | |
943 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
944 | struct ceph_mds_request *req; | |
945 | int err; | |
946 | ||
947 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
948 | return -EROFS; | |
949 | ||
950 | dout("link in dir %p old_dentry %p dentry %p\n", dir, | |
951 | old_dentry, dentry); | |
952 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS); | |
953 | if (IS_ERR(req)) { | |
954 | d_drop(dentry); | |
955 | return PTR_ERR(req); | |
956 | } | |
957 | req->r_dentry = dget(dentry); | |
958 | req->r_num_caps = 2; | |
959 | req->r_old_dentry = dget(old_dentry); | |
960 | req->r_locked_dir = dir; | |
961 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
962 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
963 | /* release LINK_SHARED on source inode (mds will lock it) */ | |
964 | req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; | |
965 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
966 | if (err) { | |
967 | d_drop(dentry); | |
968 | } else if (!req->r_reply_info.head->is_dentry) { | |
969 | ihold(d_inode(old_dentry)); | |
970 | d_instantiate(dentry, d_inode(old_dentry)); | |
971 | } | |
972 | ceph_mdsc_put_request(req); | |
973 | return err; | |
974 | } | |
975 | ||
976 | /* | |
977 | * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it | |
978 | * looks like the link count will hit 0, drop any other caps (other | |
979 | * than PIN) we don't specifically want (due to the file still being | |
980 | * open). | |
981 | */ | |
982 | static int drop_caps_for_unlink(struct inode *inode) | |
983 | { | |
984 | struct ceph_inode_info *ci = ceph_inode(inode); | |
985 | int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; | |
986 | ||
987 | spin_lock(&ci->i_ceph_lock); | |
988 | if (inode->i_nlink == 1) { | |
989 | drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN); | |
990 | ci->i_ceph_flags |= CEPH_I_NODELAY; | |
991 | } | |
992 | spin_unlock(&ci->i_ceph_lock); | |
993 | return drop; | |
994 | } | |
995 | ||
996 | /* | |
997 | * rmdir and unlink are differ only by the metadata op code | |
998 | */ | |
999 | static int ceph_unlink(struct inode *dir, struct dentry *dentry) | |
1000 | { | |
1001 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); | |
1002 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
1003 | struct inode *inode = d_inode(dentry); | |
1004 | struct ceph_mds_request *req; | |
1005 | int err = -EROFS; | |
1006 | int op; | |
1007 | ||
1008 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
1009 | /* rmdir .snap/foo is RMSNAP */ | |
1010 | dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry); | |
1011 | op = CEPH_MDS_OP_RMSNAP; | |
1012 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { | |
1013 | dout("unlink/rmdir dir %p dn %p inode %p\n", | |
1014 | dir, dentry, inode); | |
1015 | op = d_is_dir(dentry) ? | |
1016 | CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK; | |
1017 | } else | |
1018 | goto out; | |
1019 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
1020 | if (IS_ERR(req)) { | |
1021 | err = PTR_ERR(req); | |
1022 | goto out; | |
1023 | } | |
1024 | req->r_dentry = dget(dentry); | |
1025 | req->r_num_caps = 2; | |
1026 | req->r_locked_dir = dir; | |
1027 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
1028 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
1029 | req->r_inode_drop = drop_caps_for_unlink(inode); | |
1030 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
1031 | if (!err && !req->r_reply_info.head->is_dentry) | |
1032 | d_delete(dentry); | |
1033 | ceph_mdsc_put_request(req); | |
1034 | out: | |
1035 | return err; | |
1036 | } | |
1037 | ||
1038 | static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1039 | struct inode *new_dir, struct dentry *new_dentry, | |
1040 | unsigned int flags) | |
1041 | { | |
1042 | struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb); | |
1043 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
1044 | struct ceph_mds_request *req; | |
1045 | int op = CEPH_MDS_OP_RENAME; | |
1046 | int err; | |
1047 | ||
1048 | if (flags) | |
1049 | return -EINVAL; | |
1050 | ||
1051 | if (ceph_snap(old_dir) != ceph_snap(new_dir)) | |
1052 | return -EXDEV; | |
1053 | if (ceph_snap(old_dir) != CEPH_NOSNAP) { | |
1054 | if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR) | |
1055 | op = CEPH_MDS_OP_RENAMESNAP; | |
1056 | else | |
1057 | return -EROFS; | |
1058 | } | |
1059 | dout("rename dir %p dentry %p to dir %p dentry %p\n", | |
1060 | old_dir, old_dentry, new_dir, new_dentry); | |
1061 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
1062 | if (IS_ERR(req)) | |
1063 | return PTR_ERR(req); | |
1064 | ihold(old_dir); | |
1065 | req->r_dentry = dget(new_dentry); | |
1066 | req->r_num_caps = 2; | |
1067 | req->r_old_dentry = dget(old_dentry); | |
1068 | req->r_old_dentry_dir = old_dir; | |
1069 | req->r_locked_dir = new_dir; | |
1070 | req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED; | |
1071 | req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL; | |
1072 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
1073 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
1074 | /* release LINK_RDCACHE on source inode (mds will lock it) */ | |
1075 | req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; | |
1076 | if (d_really_is_positive(new_dentry)) | |
1077 | req->r_inode_drop = drop_caps_for_unlink(d_inode(new_dentry)); | |
1078 | err = ceph_mdsc_do_request(mdsc, old_dir, req); | |
1079 | if (!err && !req->r_reply_info.head->is_dentry) { | |
1080 | /* | |
1081 | * Normally d_move() is done by fill_trace (called by | |
1082 | * do_request, above). If there is no trace, we need | |
1083 | * to do it here. | |
1084 | */ | |
1085 | ||
1086 | /* d_move screws up sibling dentries' offsets */ | |
1087 | ceph_dir_clear_complete(old_dir); | |
1088 | ceph_dir_clear_complete(new_dir); | |
1089 | ||
1090 | d_move(old_dentry, new_dentry); | |
1091 | ||
1092 | /* ensure target dentry is invalidated, despite | |
1093 | rehashing bug in vfs_rename_dir */ | |
1094 | ceph_invalidate_dentry_lease(new_dentry); | |
1095 | } | |
1096 | ceph_mdsc_put_request(req); | |
1097 | return err; | |
1098 | } | |
1099 | ||
1100 | /* | |
1101 | * Ensure a dentry lease will no longer revalidate. | |
1102 | */ | |
1103 | void ceph_invalidate_dentry_lease(struct dentry *dentry) | |
1104 | { | |
1105 | spin_lock(&dentry->d_lock); | |
1106 | ceph_dentry(dentry)->time = jiffies; | |
1107 | ceph_dentry(dentry)->lease_shared_gen = 0; | |
1108 | spin_unlock(&dentry->d_lock); | |
1109 | } | |
1110 | ||
1111 | /* | |
1112 | * Check if dentry lease is valid. If not, delete the lease. Try to | |
1113 | * renew if the least is more than half up. | |
1114 | */ | |
1115 | static int dentry_lease_is_valid(struct dentry *dentry, unsigned int flags, | |
1116 | struct inode *dir) | |
1117 | { | |
1118 | struct ceph_dentry_info *di; | |
1119 | struct ceph_mds_session *s; | |
1120 | int valid = 0; | |
1121 | u32 gen; | |
1122 | unsigned long ttl; | |
1123 | struct ceph_mds_session *session = NULL; | |
1124 | u32 seq = 0; | |
1125 | ||
1126 | spin_lock(&dentry->d_lock); | |
1127 | di = ceph_dentry(dentry); | |
1128 | if (di && di->lease_session) { | |
1129 | s = di->lease_session; | |
1130 | spin_lock(&s->s_gen_ttl_lock); | |
1131 | gen = s->s_cap_gen; | |
1132 | ttl = s->s_cap_ttl; | |
1133 | spin_unlock(&s->s_gen_ttl_lock); | |
1134 | ||
1135 | if (di->lease_gen == gen && | |
1136 | time_before(jiffies, di->time) && | |
1137 | time_before(jiffies, ttl)) { | |
1138 | valid = 1; | |
1139 | if (di->lease_renew_after && | |
1140 | time_after(jiffies, di->lease_renew_after)) { | |
1141 | /* | |
1142 | * We should renew. If we're in RCU walk mode | |
1143 | * though, we can't do that so just return | |
1144 | * -ECHILD. | |
1145 | */ | |
1146 | if (flags & LOOKUP_RCU) { | |
1147 | valid = -ECHILD; | |
1148 | } else { | |
1149 | session = ceph_get_mds_session(s); | |
1150 | seq = di->lease_seq; | |
1151 | di->lease_renew_after = 0; | |
1152 | di->lease_renew_from = jiffies; | |
1153 | } | |
1154 | } | |
1155 | } | |
1156 | } | |
1157 | spin_unlock(&dentry->d_lock); | |
1158 | ||
1159 | if (session) { | |
1160 | ceph_mdsc_lease_send_msg(session, dir, dentry, | |
1161 | CEPH_MDS_LEASE_RENEW, seq); | |
1162 | ceph_put_mds_session(session); | |
1163 | } | |
1164 | dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid); | |
1165 | return valid; | |
1166 | } | |
1167 | ||
1168 | /* | |
1169 | * Check if directory-wide content lease/cap is valid. | |
1170 | */ | |
1171 | static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry) | |
1172 | { | |
1173 | struct ceph_inode_info *ci = ceph_inode(dir); | |
1174 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
1175 | int valid = 0; | |
1176 | ||
1177 | spin_lock(&ci->i_ceph_lock); | |
1178 | if (ci->i_shared_gen == di->lease_shared_gen) | |
1179 | valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1); | |
1180 | spin_unlock(&ci->i_ceph_lock); | |
1181 | dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n", | |
1182 | dir, (unsigned)ci->i_shared_gen, dentry, | |
1183 | (unsigned)di->lease_shared_gen, valid); | |
1184 | return valid; | |
1185 | } | |
1186 | ||
1187 | /* | |
1188 | * Check if cached dentry can be trusted. | |
1189 | */ | |
1190 | static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags) | |
1191 | { | |
1192 | int valid = 0; | |
1193 | struct dentry *parent; | |
1194 | struct inode *dir; | |
1195 | ||
1196 | if (flags & LOOKUP_RCU) { | |
1197 | parent = READ_ONCE(dentry->d_parent); | |
1198 | dir = d_inode_rcu(parent); | |
1199 | if (!dir) | |
1200 | return -ECHILD; | |
1201 | } else { | |
1202 | parent = dget_parent(dentry); | |
1203 | dir = d_inode(parent); | |
1204 | } | |
1205 | ||
1206 | dout("d_revalidate %p '%pd' inode %p offset %lld\n", dentry, | |
1207 | dentry, d_inode(dentry), ceph_dentry(dentry)->offset); | |
1208 | ||
1209 | /* always trust cached snapped dentries, snapdir dentry */ | |
1210 | if (ceph_snap(dir) != CEPH_NOSNAP) { | |
1211 | dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry, | |
1212 | dentry, d_inode(dentry)); | |
1213 | valid = 1; | |
1214 | } else if (d_really_is_positive(dentry) && | |
1215 | ceph_snap(d_inode(dentry)) == CEPH_SNAPDIR) { | |
1216 | valid = 1; | |
1217 | } else { | |
1218 | valid = dentry_lease_is_valid(dentry, flags, dir); | |
1219 | if (valid == -ECHILD) | |
1220 | return valid; | |
1221 | if (valid || dir_lease_is_valid(dir, dentry)) { | |
1222 | if (d_really_is_positive(dentry)) | |
1223 | valid = ceph_is_any_caps(d_inode(dentry)); | |
1224 | else | |
1225 | valid = 1; | |
1226 | } | |
1227 | } | |
1228 | ||
1229 | if (!valid) { | |
1230 | struct ceph_mds_client *mdsc = | |
1231 | ceph_sb_to_client(dir->i_sb)->mdsc; | |
1232 | struct ceph_mds_request *req; | |
1233 | int op, err; | |
1234 | u32 mask; | |
1235 | ||
1236 | if (flags & LOOKUP_RCU) | |
1237 | return -ECHILD; | |
1238 | ||
1239 | op = ceph_snap(dir) == CEPH_SNAPDIR ? | |
1240 | CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_GETATTR; | |
1241 | req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); | |
1242 | if (!IS_ERR(req)) { | |
1243 | req->r_dentry = dget(dentry); | |
1244 | req->r_num_caps = op == CEPH_MDS_OP_GETATTR ? 1 : 2; | |
1245 | ||
1246 | mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED; | |
1247 | if (ceph_security_xattr_wanted(dir)) | |
1248 | mask |= CEPH_CAP_XATTR_SHARED; | |
1249 | req->r_args.getattr.mask = cpu_to_le32(mask); | |
1250 | ||
1251 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
1252 | switch (err) { | |
1253 | case 0: | |
1254 | if (d_really_is_positive(dentry) && | |
1255 | d_inode(dentry) == req->r_target_inode) | |
1256 | valid = 1; | |
1257 | break; | |
1258 | case -ENOENT: | |
1259 | if (d_really_is_negative(dentry)) | |
1260 | valid = 1; | |
1261 | /* Fallthrough */ | |
1262 | default: | |
1263 | break; | |
1264 | } | |
1265 | ceph_mdsc_put_request(req); | |
1266 | dout("d_revalidate %p lookup result=%d\n", | |
1267 | dentry, err); | |
1268 | } | |
1269 | } | |
1270 | ||
1271 | dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid"); | |
1272 | if (valid) { | |
1273 | ceph_dentry_lru_touch(dentry); | |
1274 | } else { | |
1275 | ceph_dir_clear_complete(dir); | |
1276 | } | |
1277 | ||
1278 | if (!(flags & LOOKUP_RCU)) | |
1279 | dput(parent); | |
1280 | return valid; | |
1281 | } | |
1282 | ||
1283 | /* | |
1284 | * Release our ceph_dentry_info. | |
1285 | */ | |
1286 | static void ceph_d_release(struct dentry *dentry) | |
1287 | { | |
1288 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
1289 | ||
1290 | dout("d_release %p\n", dentry); | |
1291 | ceph_dentry_lru_del(dentry); | |
1292 | ||
1293 | spin_lock(&dentry->d_lock); | |
1294 | dentry->d_fsdata = NULL; | |
1295 | spin_unlock(&dentry->d_lock); | |
1296 | ||
1297 | if (di->lease_session) | |
1298 | ceph_put_mds_session(di->lease_session); | |
1299 | kmem_cache_free(ceph_dentry_cachep, di); | |
1300 | } | |
1301 | ||
1302 | /* | |
1303 | * When the VFS prunes a dentry from the cache, we need to clear the | |
1304 | * complete flag on the parent directory. | |
1305 | * | |
1306 | * Called under dentry->d_lock. | |
1307 | */ | |
1308 | static void ceph_d_prune(struct dentry *dentry) | |
1309 | { | |
1310 | dout("ceph_d_prune %p\n", dentry); | |
1311 | ||
1312 | /* do we have a valid parent? */ | |
1313 | if (IS_ROOT(dentry)) | |
1314 | return; | |
1315 | ||
1316 | /* if we are not hashed, we don't affect dir's completeness */ | |
1317 | if (d_unhashed(dentry)) | |
1318 | return; | |
1319 | ||
1320 | if (ceph_snap(d_inode(dentry->d_parent)) == CEPH_SNAPDIR) | |
1321 | return; | |
1322 | ||
1323 | /* | |
1324 | * we hold d_lock, so d_parent is stable, and d_fsdata is never | |
1325 | * cleared until d_release | |
1326 | */ | |
1327 | ceph_dir_clear_complete(d_inode(dentry->d_parent)); | |
1328 | } | |
1329 | ||
1330 | /* | |
1331 | * read() on a dir. This weird interface hack only works if mounted | |
1332 | * with '-o dirstat'. | |
1333 | */ | |
1334 | static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, | |
1335 | loff_t *ppos) | |
1336 | { | |
1337 | struct ceph_file_info *cf = file->private_data; | |
1338 | struct inode *inode = file_inode(file); | |
1339 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1340 | int left; | |
1341 | const int bufsize = 1024; | |
1342 | ||
1343 | if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT)) | |
1344 | return -EISDIR; | |
1345 | ||
1346 | if (!cf->dir_info) { | |
1347 | cf->dir_info = kmalloc(bufsize, GFP_KERNEL); | |
1348 | if (!cf->dir_info) | |
1349 | return -ENOMEM; | |
1350 | cf->dir_info_len = | |
1351 | snprintf(cf->dir_info, bufsize, | |
1352 | "entries: %20lld\n" | |
1353 | " files: %20lld\n" | |
1354 | " subdirs: %20lld\n" | |
1355 | "rentries: %20lld\n" | |
1356 | " rfiles: %20lld\n" | |
1357 | " rsubdirs: %20lld\n" | |
1358 | "rbytes: %20lld\n" | |
1359 | "rctime: %10ld.%09ld\n", | |
1360 | ci->i_files + ci->i_subdirs, | |
1361 | ci->i_files, | |
1362 | ci->i_subdirs, | |
1363 | ci->i_rfiles + ci->i_rsubdirs, | |
1364 | ci->i_rfiles, | |
1365 | ci->i_rsubdirs, | |
1366 | ci->i_rbytes, | |
1367 | (long)ci->i_rctime.tv_sec, | |
1368 | (long)ci->i_rctime.tv_nsec); | |
1369 | } | |
1370 | ||
1371 | if (*ppos >= cf->dir_info_len) | |
1372 | return 0; | |
1373 | size = min_t(unsigned, size, cf->dir_info_len-*ppos); | |
1374 | left = copy_to_user(buf, cf->dir_info + *ppos, size); | |
1375 | if (left == size) | |
1376 | return -EFAULT; | |
1377 | *ppos += (size - left); | |
1378 | return size - left; | |
1379 | } | |
1380 | ||
1381 | /* | |
1382 | * We maintain a private dentry LRU. | |
1383 | * | |
1384 | * FIXME: this needs to be changed to a per-mds lru to be useful. | |
1385 | */ | |
1386 | void ceph_dentry_lru_add(struct dentry *dn) | |
1387 | { | |
1388 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1389 | struct ceph_mds_client *mdsc; | |
1390 | ||
1391 | dout("dentry_lru_add %p %p '%pd'\n", di, dn, dn); | |
1392 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; | |
1393 | spin_lock(&mdsc->dentry_lru_lock); | |
1394 | list_add_tail(&di->lru, &mdsc->dentry_lru); | |
1395 | mdsc->num_dentry++; | |
1396 | spin_unlock(&mdsc->dentry_lru_lock); | |
1397 | } | |
1398 | ||
1399 | void ceph_dentry_lru_touch(struct dentry *dn) | |
1400 | { | |
1401 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1402 | struct ceph_mds_client *mdsc; | |
1403 | ||
1404 | dout("dentry_lru_touch %p %p '%pd' (offset %lld)\n", di, dn, dn, | |
1405 | di->offset); | |
1406 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; | |
1407 | spin_lock(&mdsc->dentry_lru_lock); | |
1408 | list_move_tail(&di->lru, &mdsc->dentry_lru); | |
1409 | spin_unlock(&mdsc->dentry_lru_lock); | |
1410 | } | |
1411 | ||
1412 | void ceph_dentry_lru_del(struct dentry *dn) | |
1413 | { | |
1414 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1415 | struct ceph_mds_client *mdsc; | |
1416 | ||
1417 | dout("dentry_lru_del %p %p '%pd'\n", di, dn, dn); | |
1418 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; | |
1419 | spin_lock(&mdsc->dentry_lru_lock); | |
1420 | list_del_init(&di->lru); | |
1421 | mdsc->num_dentry--; | |
1422 | spin_unlock(&mdsc->dentry_lru_lock); | |
1423 | } | |
1424 | ||
1425 | /* | |
1426 | * Return name hash for a given dentry. This is dependent on | |
1427 | * the parent directory's hash function. | |
1428 | */ | |
1429 | unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn) | |
1430 | { | |
1431 | struct ceph_inode_info *dci = ceph_inode(dir); | |
1432 | ||
1433 | switch (dci->i_dir_layout.dl_dir_hash) { | |
1434 | case 0: /* for backward compat */ | |
1435 | case CEPH_STR_HASH_LINUX: | |
1436 | return dn->d_name.hash; | |
1437 | ||
1438 | default: | |
1439 | return ceph_str_hash(dci->i_dir_layout.dl_dir_hash, | |
1440 | dn->d_name.name, dn->d_name.len); | |
1441 | } | |
1442 | } | |
1443 | ||
1444 | const struct file_operations ceph_dir_fops = { | |
1445 | .read = ceph_read_dir, | |
1446 | .iterate = ceph_readdir, | |
1447 | .llseek = ceph_dir_llseek, | |
1448 | .open = ceph_open, | |
1449 | .release = ceph_release, | |
1450 | .unlocked_ioctl = ceph_ioctl, | |
1451 | .fsync = ceph_fsync, | |
1452 | }; | |
1453 | ||
1454 | const struct file_operations ceph_snapdir_fops = { | |
1455 | .iterate = ceph_readdir, | |
1456 | .llseek = ceph_dir_llseek, | |
1457 | .open = ceph_open, | |
1458 | .release = ceph_release, | |
1459 | }; | |
1460 | ||
1461 | const struct inode_operations ceph_dir_iops = { | |
1462 | .lookup = ceph_lookup, | |
1463 | .permission = ceph_permission, | |
1464 | .getattr = ceph_getattr, | |
1465 | .setattr = ceph_setattr, | |
1466 | .listxattr = ceph_listxattr, | |
1467 | .get_acl = ceph_get_acl, | |
1468 | .set_acl = ceph_set_acl, | |
1469 | .mknod = ceph_mknod, | |
1470 | .symlink = ceph_symlink, | |
1471 | .mkdir = ceph_mkdir, | |
1472 | .link = ceph_link, | |
1473 | .unlink = ceph_unlink, | |
1474 | .rmdir = ceph_unlink, | |
1475 | .rename = ceph_rename, | |
1476 | .create = ceph_create, | |
1477 | .atomic_open = ceph_atomic_open, | |
1478 | }; | |
1479 | ||
1480 | const struct inode_operations ceph_snapdir_iops = { | |
1481 | .lookup = ceph_lookup, | |
1482 | .permission = ceph_permission, | |
1483 | .getattr = ceph_getattr, | |
1484 | .mkdir = ceph_mkdir, | |
1485 | .rmdir = ceph_unlink, | |
1486 | .rename = ceph_rename, | |
1487 | }; | |
1488 | ||
1489 | const struct dentry_operations ceph_dentry_ops = { | |
1490 | .d_revalidate = ceph_d_revalidate, | |
1491 | .d_release = ceph_d_release, | |
1492 | .d_prune = ceph_d_prune, | |
1493 | .d_init = ceph_d_init, | |
1494 | }; |