Commit | Line | Data |
---|---|---|
3d14c5d2 | 1 | #include <linux/ceph/ceph_debug.h> |
2817b000 SW |
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" | |
3d14c5d2 | 10 | #include "mds_client.h" |
2817b000 SW |
11 | |
12 | /* | |
13 | * Directory operations: readdir, lookup, create, link, unlink, | |
14 | * rename, etc. | |
15 | */ | |
16 | ||
17 | /* | |
18 | * Ceph MDS operations are specified in terms of a base ino and | |
19 | * relative path. Thus, the client can specify an operation on a | |
20 | * specific inode (e.g., a getattr due to fstat(2)), or as a path | |
21 | * relative to, say, the root directory. | |
22 | * | |
23 | * Normally, we limit ourselves to strict inode ops (no path component) | |
24 | * or dentry operations (a single path component relative to an ino). The | |
25 | * exception to this is open_root_dentry(), which will open the mount | |
26 | * point by name. | |
27 | */ | |
28 | ||
29 | const struct inode_operations ceph_dir_iops; | |
30 | const struct file_operations ceph_dir_fops; | |
52dfb8ac | 31 | const struct dentry_operations ceph_dentry_ops; |
2817b000 SW |
32 | |
33 | /* | |
34 | * Initialize ceph dentry state. | |
35 | */ | |
36 | int ceph_init_dentry(struct dentry *dentry) | |
37 | { | |
38 | struct ceph_dentry_info *di; | |
39 | ||
40 | if (dentry->d_fsdata) | |
41 | return 0; | |
42 | ||
36e21687 | 43 | di = kmem_cache_alloc(ceph_dentry_cachep, GFP_NOFS | __GFP_ZERO); |
2817b000 SW |
44 | if (!di) |
45 | return -ENOMEM; /* oh well */ | |
46 | ||
47 | spin_lock(&dentry->d_lock); | |
8c6efb58 SW |
48 | if (dentry->d_fsdata) { |
49 | /* lost a race */ | |
50 | kmem_cache_free(ceph_dentry_cachep, di); | |
2817b000 | 51 | goto out_unlock; |
8c6efb58 | 52 | } |
48d0cbd1 SW |
53 | |
54 | if (dentry->d_parent == NULL || /* nfs fh_to_dentry */ | |
55 | ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) | |
56 | d_set_d_op(dentry, &ceph_dentry_ops); | |
57 | else if (ceph_snap(dentry->d_parent->d_inode) == CEPH_SNAPDIR) | |
58 | d_set_d_op(dentry, &ceph_snapdir_dentry_ops); | |
59 | else | |
60 | d_set_d_op(dentry, &ceph_snap_dentry_ops); | |
61 | ||
2817b000 SW |
62 | di->dentry = dentry; |
63 | di->lease_session = NULL; | |
2817b000 | 64 | dentry->d_time = jiffies; |
48d0cbd1 SW |
65 | /* avoid reordering d_fsdata setup so that the check above is safe */ |
66 | smp_mb(); | |
67 | dentry->d_fsdata = di; | |
2817b000 SW |
68 | ceph_dentry_lru_add(dentry); |
69 | out_unlock: | |
70 | spin_unlock(&dentry->d_lock); | |
71 | return 0; | |
72 | } | |
73 | ||
5f21c96d SW |
74 | struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry) |
75 | { | |
76 | struct inode *inode = NULL; | |
77 | ||
78 | if (!dentry) | |
79 | return NULL; | |
80 | ||
81 | spin_lock(&dentry->d_lock); | |
82 | if (dentry->d_parent) { | |
83 | inode = dentry->d_parent->d_inode; | |
84 | ihold(inode); | |
85 | } | |
86 | spin_unlock(&dentry->d_lock); | |
87 | return inode; | |
88 | } | |
2817b000 SW |
89 | |
90 | ||
91 | /* | |
92 | * for readdir, we encode the directory frag and offset within that | |
93 | * frag into f_pos. | |
94 | */ | |
95 | static unsigned fpos_frag(loff_t p) | |
96 | { | |
97 | return p >> 32; | |
98 | } | |
99 | static unsigned fpos_off(loff_t p) | |
100 | { | |
101 | return p & 0xffffffff; | |
102 | } | |
103 | ||
104 | /* | |
105 | * When possible, we try to satisfy a readdir by peeking at the | |
106 | * dcache. We make this work by carefully ordering dentries on | |
107 | * d_u.d_child when we initially get results back from the MDS, and | |
108 | * falling back to a "normal" sync readdir if any dentries in the dir | |
109 | * are dropped. | |
110 | * | |
111 | * I_COMPLETE tells indicates we have all dentries in the dir. It is | |
112 | * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by | |
113 | * the MDS if/when the directory is modified). | |
114 | */ | |
115 | static int __dcache_readdir(struct file *filp, | |
116 | void *dirent, filldir_t filldir) | |
117 | { | |
2817b000 SW |
118 | struct ceph_file_info *fi = filp->private_data; |
119 | struct dentry *parent = filp->f_dentry; | |
120 | struct inode *dir = parent->d_inode; | |
121 | struct list_head *p; | |
122 | struct dentry *dentry, *last; | |
123 | struct ceph_dentry_info *di; | |
124 | int err = 0; | |
125 | ||
126 | /* claim ref on last dentry we returned */ | |
127 | last = fi->dentry; | |
128 | fi->dentry = NULL; | |
129 | ||
130 | dout("__dcache_readdir %p at %llu (last %p)\n", dir, filp->f_pos, | |
131 | last); | |
132 | ||
2fd6b7f5 | 133 | spin_lock(&parent->d_lock); |
2817b000 SW |
134 | |
135 | /* start at beginning? */ | |
884ea892 SW |
136 | if (filp->f_pos == 2 || last == NULL || |
137 | filp->f_pos < ceph_dentry(last)->offset) { | |
2817b000 SW |
138 | if (list_empty(&parent->d_subdirs)) |
139 | goto out_unlock; | |
140 | p = parent->d_subdirs.prev; | |
141 | dout(" initial p %p/%p\n", p->prev, p->next); | |
142 | } else { | |
143 | p = last->d_u.d_child.prev; | |
144 | } | |
145 | ||
146 | more: | |
147 | dentry = list_entry(p, struct dentry, d_u.d_child); | |
148 | di = ceph_dentry(dentry); | |
149 | while (1) { | |
1cd3935b SW |
150 | dout(" p %p/%p %s d_subdirs %p/%p\n", p->prev, p->next, |
151 | d_unhashed(dentry) ? "!hashed" : "hashed", | |
2817b000 SW |
152 | parent->d_subdirs.prev, parent->d_subdirs.next); |
153 | if (p == &parent->d_subdirs) { | |
9cfa1098 | 154 | fi->flags |= CEPH_F_ATEND; |
2817b000 SW |
155 | goto out_unlock; |
156 | } | |
2fd6b7f5 | 157 | spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED); |
2817b000 | 158 | if (!d_unhashed(dentry) && dentry->d_inode && |
09b8a7d2 | 159 | ceph_snap(dentry->d_inode) != CEPH_SNAPDIR && |
1d1de916 | 160 | ceph_ino(dentry->d_inode) != CEPH_INO_CEPH && |
2817b000 SW |
161 | filp->f_pos <= di->offset) |
162 | break; | |
163 | dout(" skipping %p %.*s at %llu (%llu)%s%s\n", dentry, | |
164 | dentry->d_name.len, dentry->d_name.name, di->offset, | |
165 | filp->f_pos, d_unhashed(dentry) ? " unhashed" : "", | |
166 | !dentry->d_inode ? " null" : ""); | |
da502956 | 167 | spin_unlock(&dentry->d_lock); |
2817b000 SW |
168 | p = p->prev; |
169 | dentry = list_entry(p, struct dentry, d_u.d_child); | |
170 | di = ceph_dentry(dentry); | |
171 | } | |
172 | ||
da502956 | 173 | dget_dlock(dentry); |
b7ab39f6 | 174 | spin_unlock(&dentry->d_lock); |
2fd6b7f5 | 175 | spin_unlock(&parent->d_lock); |
2817b000 SW |
176 | |
177 | dout(" %llu (%llu) dentry %p %.*s %p\n", di->offset, filp->f_pos, | |
178 | dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode); | |
179 | filp->f_pos = di->offset; | |
180 | err = filldir(dirent, dentry->d_name.name, | |
181 | dentry->d_name.len, di->offset, | |
ad1fee96 | 182 | ceph_translate_ino(dentry->d_sb, dentry->d_inode->i_ino), |
2817b000 SW |
183 | dentry->d_inode->i_mode >> 12); |
184 | ||
185 | if (last) { | |
186 | if (err < 0) { | |
187 | /* remember our position */ | |
188 | fi->dentry = last; | |
189 | fi->next_offset = di->offset; | |
190 | } else { | |
191 | dput(last); | |
192 | } | |
2817b000 | 193 | } |
f5b06628 SW |
194 | last = dentry; |
195 | ||
2817b000 | 196 | if (err < 0) |
efa4c120 | 197 | goto out; |
2817b000 | 198 | |
2817b000 SW |
199 | filp->f_pos++; |
200 | ||
b5c84bf6 | 201 | /* make sure a dentry wasn't dropped while we didn't have parent lock */ |
efa4c120 SW |
202 | if (!ceph_i_test(dir, CEPH_I_COMPLETE)) { |
203 | dout(" lost I_COMPLETE on %p; falling back to mds\n", dir); | |
204 | err = -EAGAIN; | |
205 | goto out; | |
206 | } | |
207 | ||
2fd6b7f5 | 208 | spin_lock(&parent->d_lock); |
efa4c120 SW |
209 | p = p->prev; /* advance to next dentry */ |
210 | goto more; | |
2817b000 SW |
211 | |
212 | out_unlock: | |
2fd6b7f5 | 213 | spin_unlock(&parent->d_lock); |
efa4c120 SW |
214 | out: |
215 | if (last) | |
2817b000 | 216 | dput(last); |
2817b000 SW |
217 | return err; |
218 | } | |
219 | ||
220 | /* | |
221 | * make note of the last dentry we read, so we can | |
222 | * continue at the same lexicographical point, | |
223 | * regardless of what dir changes take place on the | |
224 | * server. | |
225 | */ | |
226 | static int note_last_dentry(struct ceph_file_info *fi, const char *name, | |
227 | int len) | |
228 | { | |
229 | kfree(fi->last_name); | |
230 | fi->last_name = kmalloc(len+1, GFP_NOFS); | |
231 | if (!fi->last_name) | |
232 | return -ENOMEM; | |
233 | memcpy(fi->last_name, name, len); | |
234 | fi->last_name[len] = 0; | |
235 | dout("note_last_dentry '%s'\n", fi->last_name); | |
236 | return 0; | |
237 | } | |
238 | ||
239 | static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
240 | { | |
241 | struct ceph_file_info *fi = filp->private_data; | |
242 | struct inode *inode = filp->f_dentry->d_inode; | |
243 | struct ceph_inode_info *ci = ceph_inode(inode); | |
3d14c5d2 YS |
244 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
245 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
246 | unsigned frag = fpos_frag(filp->f_pos); |
247 | int off = fpos_off(filp->f_pos); | |
248 | int err; | |
249 | u32 ftype; | |
250 | struct ceph_mds_reply_info_parsed *rinfo; | |
3d14c5d2 YS |
251 | const int max_entries = fsc->mount_options->max_readdir; |
252 | const int max_bytes = fsc->mount_options->max_readdir_bytes; | |
2817b000 SW |
253 | |
254 | dout("readdir %p filp %p frag %u off %u\n", inode, filp, frag, off); | |
9cfa1098 | 255 | if (fi->flags & CEPH_F_ATEND) |
2817b000 SW |
256 | return 0; |
257 | ||
258 | /* always start with . and .. */ | |
259 | if (filp->f_pos == 0) { | |
260 | /* note dir version at start of readdir so we can tell | |
261 | * if any dentries get dropped */ | |
262 | fi->dir_release_count = ci->i_release_count; | |
263 | ||
264 | dout("readdir off 0 -> '.'\n"); | |
265 | if (filldir(dirent, ".", 1, ceph_make_fpos(0, 0), | |
ad1fee96 YS |
266 | ceph_translate_ino(inode->i_sb, inode->i_ino), |
267 | inode->i_mode >> 12) < 0) | |
2817b000 SW |
268 | return 0; |
269 | filp->f_pos = 1; | |
270 | off = 1; | |
271 | } | |
272 | if (filp->f_pos == 1) { | |
b85fd6bd | 273 | ino_t ino = parent_ino(filp->f_dentry); |
2817b000 SW |
274 | dout("readdir off 1 -> '..'\n"); |
275 | if (filldir(dirent, "..", 2, ceph_make_fpos(0, 1), | |
ad1fee96 | 276 | ceph_translate_ino(inode->i_sb, ino), |
2817b000 SW |
277 | inode->i_mode >> 12) < 0) |
278 | return 0; | |
279 | filp->f_pos = 2; | |
280 | off = 2; | |
281 | } | |
282 | ||
283 | /* can we use the dcache? */ | |
284 | spin_lock(&inode->i_lock); | |
285 | if ((filp->f_pos == 2 || fi->dentry) && | |
3d14c5d2 | 286 | !ceph_test_mount_opt(fsc, NOASYNCREADDIR) && |
a0dff78d | 287 | ceph_snap(inode) != CEPH_SNAPDIR && |
2817b000 SW |
288 | (ci->i_ceph_flags & CEPH_I_COMPLETE) && |
289 | __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) { | |
efa4c120 | 290 | spin_unlock(&inode->i_lock); |
2817b000 | 291 | err = __dcache_readdir(filp, dirent, filldir); |
efa4c120 | 292 | if (err != -EAGAIN) |
2817b000 | 293 | return err; |
efa4c120 SW |
294 | } else { |
295 | spin_unlock(&inode->i_lock); | |
2817b000 | 296 | } |
2817b000 SW |
297 | if (fi->dentry) { |
298 | err = note_last_dentry(fi, fi->dentry->d_name.name, | |
299 | fi->dentry->d_name.len); | |
300 | if (err) | |
301 | return err; | |
302 | dput(fi->dentry); | |
303 | fi->dentry = NULL; | |
304 | } | |
305 | ||
306 | /* proceed with a normal readdir */ | |
307 | ||
308 | more: | |
309 | /* do we have the correct frag content buffered? */ | |
310 | if (fi->frag != frag || fi->last_readdir == NULL) { | |
311 | struct ceph_mds_request *req; | |
312 | int op = ceph_snap(inode) == CEPH_SNAPDIR ? | |
313 | CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR; | |
314 | ||
315 | /* discard old result, if any */ | |
393f6620 | 316 | if (fi->last_readdir) { |
2817b000 | 317 | ceph_mdsc_put_request(fi->last_readdir); |
393f6620 SW |
318 | fi->last_readdir = NULL; |
319 | } | |
2817b000 SW |
320 | |
321 | /* requery frag tree, as the frag topology may have changed */ | |
322 | frag = ceph_choose_frag(ceph_inode(inode), frag, NULL, NULL); | |
323 | ||
324 | dout("readdir fetching %llx.%llx frag %x offset '%s'\n", | |
325 | ceph_vinop(inode), frag, fi->last_name); | |
326 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
327 | if (IS_ERR(req)) | |
328 | return PTR_ERR(req); | |
70b666c3 SW |
329 | req->r_inode = inode; |
330 | ihold(inode); | |
2817b000 SW |
331 | req->r_dentry = dget(filp->f_dentry); |
332 | /* hints to request -> mds selection code */ | |
333 | req->r_direct_mode = USE_AUTH_MDS; | |
334 | req->r_direct_hash = ceph_frag_value(frag); | |
335 | req->r_direct_is_hash = true; | |
336 | req->r_path2 = kstrdup(fi->last_name, GFP_NOFS); | |
337 | req->r_readdir_offset = fi->next_offset; | |
338 | req->r_args.readdir.frag = cpu_to_le32(frag); | |
339 | req->r_args.readdir.max_entries = cpu_to_le32(max_entries); | |
23804d91 | 340 | req->r_args.readdir.max_bytes = cpu_to_le32(max_bytes); |
e1e4dd0c | 341 | req->r_num_caps = max_entries + 1; |
2817b000 SW |
342 | err = ceph_mdsc_do_request(mdsc, NULL, req); |
343 | if (err < 0) { | |
344 | ceph_mdsc_put_request(req); | |
345 | return err; | |
346 | } | |
347 | dout("readdir got and parsed readdir result=%d" | |
348 | " on frag %x, end=%d, complete=%d\n", err, frag, | |
349 | (int)req->r_reply_info.dir_end, | |
350 | (int)req->r_reply_info.dir_complete); | |
351 | ||
352 | if (!req->r_did_prepopulate) { | |
353 | dout("readdir !did_prepopulate"); | |
354 | fi->dir_release_count--; /* preclude I_COMPLETE */ | |
355 | } | |
356 | ||
357 | /* note next offset and last dentry name */ | |
358 | fi->offset = fi->next_offset; | |
359 | fi->last_readdir = req; | |
360 | ||
361 | if (req->r_reply_info.dir_end) { | |
362 | kfree(fi->last_name); | |
363 | fi->last_name = NULL; | |
7b88dadc SW |
364 | if (ceph_frag_is_rightmost(frag)) |
365 | fi->next_offset = 2; | |
366 | else | |
367 | fi->next_offset = 0; | |
2817b000 SW |
368 | } else { |
369 | rinfo = &req->r_reply_info; | |
370 | err = note_last_dentry(fi, | |
371 | rinfo->dir_dname[rinfo->dir_nr-1], | |
372 | rinfo->dir_dname_len[rinfo->dir_nr-1]); | |
373 | if (err) | |
374 | return err; | |
375 | fi->next_offset += rinfo->dir_nr; | |
376 | } | |
377 | } | |
378 | ||
379 | rinfo = &fi->last_readdir->r_reply_info; | |
380 | dout("readdir frag %x num %d off %d chunkoff %d\n", frag, | |
381 | rinfo->dir_nr, off, fi->offset); | |
da39822c | 382 | while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) { |
2817b000 SW |
383 | u64 pos = ceph_make_fpos(frag, off); |
384 | struct ceph_mds_reply_inode *in = | |
385 | rinfo->dir_in[off - fi->offset].in; | |
3105c19c SW |
386 | struct ceph_vino vino; |
387 | ino_t ino; | |
388 | ||
2817b000 SW |
389 | dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n", |
390 | off, off - fi->offset, rinfo->dir_nr, pos, | |
391 | rinfo->dir_dname_len[off - fi->offset], | |
392 | rinfo->dir_dname[off - fi->offset], in); | |
393 | BUG_ON(!in); | |
394 | ftype = le32_to_cpu(in->mode) >> 12; | |
3105c19c SW |
395 | vino.ino = le64_to_cpu(in->ino); |
396 | vino.snap = le64_to_cpu(in->snapid); | |
397 | ino = ceph_vino_to_ino(vino); | |
2817b000 SW |
398 | if (filldir(dirent, |
399 | rinfo->dir_dname[off - fi->offset], | |
400 | rinfo->dir_dname_len[off - fi->offset], | |
ad1fee96 YS |
401 | pos, |
402 | ceph_translate_ino(inode->i_sb, ino), ftype) < 0) { | |
2817b000 SW |
403 | dout("filldir stopping us...\n"); |
404 | return 0; | |
405 | } | |
406 | off++; | |
407 | filp->f_pos = pos + 1; | |
408 | } | |
409 | ||
410 | if (fi->last_name) { | |
411 | ceph_mdsc_put_request(fi->last_readdir); | |
412 | fi->last_readdir = NULL; | |
413 | goto more; | |
414 | } | |
415 | ||
416 | /* more frags? */ | |
417 | if (!ceph_frag_is_rightmost(frag)) { | |
418 | frag = ceph_frag_next(frag); | |
419 | off = 0; | |
420 | filp->f_pos = ceph_make_fpos(frag, off); | |
421 | dout("readdir next frag is %x\n", frag); | |
422 | goto more; | |
423 | } | |
9cfa1098 | 424 | fi->flags |= CEPH_F_ATEND; |
2817b000 SW |
425 | |
426 | /* | |
427 | * if dir_release_count still matches the dir, no dentries | |
428 | * were released during the whole readdir, and we should have | |
429 | * the complete dir contents in our cache. | |
430 | */ | |
431 | spin_lock(&inode->i_lock); | |
432 | if (ci->i_release_count == fi->dir_release_count) { | |
433 | dout(" marking %p complete\n", inode); | |
b545cc15 | 434 | /* ci->i_ceph_flags |= CEPH_I_COMPLETE; */ |
2817b000 SW |
435 | ci->i_max_offset = filp->f_pos; |
436 | } | |
437 | spin_unlock(&inode->i_lock); | |
438 | ||
439 | dout("readdir %p filp %p done.\n", inode, filp); | |
440 | return 0; | |
441 | } | |
442 | ||
443 | static void reset_readdir(struct ceph_file_info *fi) | |
444 | { | |
445 | if (fi->last_readdir) { | |
446 | ceph_mdsc_put_request(fi->last_readdir); | |
447 | fi->last_readdir = NULL; | |
448 | } | |
449 | kfree(fi->last_name); | |
a1629c3b | 450 | fi->last_name = NULL; |
2817b000 SW |
451 | fi->next_offset = 2; /* compensate for . and .. */ |
452 | if (fi->dentry) { | |
453 | dput(fi->dentry); | |
454 | fi->dentry = NULL; | |
455 | } | |
9cfa1098 | 456 | fi->flags &= ~CEPH_F_ATEND; |
2817b000 SW |
457 | } |
458 | ||
459 | static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int origin) | |
460 | { | |
461 | struct ceph_file_info *fi = file->private_data; | |
462 | struct inode *inode = file->f_mapping->host; | |
463 | loff_t old_offset = offset; | |
464 | loff_t retval; | |
465 | ||
466 | mutex_lock(&inode->i_mutex); | |
06222e49 | 467 | retval = -EINVAL; |
2817b000 SW |
468 | switch (origin) { |
469 | case SEEK_END: | |
470 | offset += inode->i_size + 2; /* FIXME */ | |
471 | break; | |
472 | case SEEK_CUR: | |
473 | offset += file->f_pos; | |
06222e49 JB |
474 | case SEEK_SET: |
475 | break; | |
476 | default: | |
477 | goto out; | |
2817b000 | 478 | } |
06222e49 | 479 | |
2817b000 SW |
480 | if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) { |
481 | if (offset != file->f_pos) { | |
482 | file->f_pos = offset; | |
483 | file->f_version = 0; | |
9cfa1098 | 484 | fi->flags &= ~CEPH_F_ATEND; |
2817b000 SW |
485 | } |
486 | retval = offset; | |
487 | ||
488 | /* | |
489 | * discard buffered readdir content on seekdir(0), or | |
490 | * seek to new frag, or seek prior to current chunk. | |
491 | */ | |
492 | if (offset == 0 || | |
493 | fpos_frag(offset) != fpos_frag(old_offset) || | |
494 | fpos_off(offset) < fi->offset) { | |
495 | dout("dir_llseek dropping %p content\n", file); | |
496 | reset_readdir(fi); | |
497 | } | |
498 | ||
499 | /* bump dir_release_count if we did a forward seek */ | |
500 | if (offset > old_offset) | |
501 | fi->dir_release_count--; | |
502 | } | |
06222e49 | 503 | out: |
2817b000 SW |
504 | mutex_unlock(&inode->i_mutex); |
505 | return retval; | |
506 | } | |
507 | ||
508 | /* | |
468640e3 | 509 | * Handle lookups for the hidden .snap directory. |
2817b000 | 510 | */ |
468640e3 SW |
511 | int ceph_handle_snapdir(struct ceph_mds_request *req, |
512 | struct dentry *dentry, int err) | |
2817b000 | 513 | { |
3d14c5d2 | 514 | struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); |
d79698da | 515 | struct inode *parent = dentry->d_parent->d_inode; /* we hold i_mutex */ |
2817b000 SW |
516 | |
517 | /* .snap dir? */ | |
518 | if (err == -ENOENT && | |
455cec0a | 519 | ceph_snap(parent) == CEPH_NOSNAP && |
6b805185 | 520 | strcmp(dentry->d_name.name, |
3d14c5d2 | 521 | fsc->mount_options->snapdir_name) == 0) { |
2817b000 SW |
522 | struct inode *inode = ceph_get_snapdir(parent); |
523 | dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p\n", | |
524 | dentry, dentry->d_name.len, dentry->d_name.name, inode); | |
9358c6d4 | 525 | BUG_ON(!d_unhashed(dentry)); |
2817b000 SW |
526 | d_add(dentry, inode); |
527 | err = 0; | |
528 | } | |
468640e3 SW |
529 | return err; |
530 | } | |
2817b000 | 531 | |
468640e3 SW |
532 | /* |
533 | * Figure out final result of a lookup/open request. | |
534 | * | |
535 | * Mainly, make sure we return the final req->r_dentry (if it already | |
536 | * existed) in place of the original VFS-provided dentry when they | |
537 | * differ. | |
538 | * | |
539 | * Gracefully handle the case where the MDS replies with -ENOENT and | |
540 | * no trace (which it may do, at its discretion, e.g., if it doesn't | |
541 | * care to issue a lease on the negative dentry). | |
542 | */ | |
543 | struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, | |
544 | struct dentry *dentry, int err) | |
545 | { | |
2817b000 SW |
546 | if (err == -ENOENT) { |
547 | /* no trace? */ | |
548 | err = 0; | |
549 | if (!req->r_reply_info.head->is_dentry) { | |
550 | dout("ENOENT and no trace, dentry %p inode %p\n", | |
551 | dentry, dentry->d_inode); | |
552 | if (dentry->d_inode) { | |
553 | d_drop(dentry); | |
554 | err = -ENOENT; | |
555 | } else { | |
556 | d_add(dentry, NULL); | |
557 | } | |
558 | } | |
559 | } | |
560 | if (err) | |
561 | dentry = ERR_PTR(err); | |
562 | else if (dentry != req->r_dentry) | |
563 | dentry = dget(req->r_dentry); /* we got spliced */ | |
564 | else | |
565 | dentry = NULL; | |
566 | return dentry; | |
567 | } | |
568 | ||
1d1de916 SW |
569 | static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry) |
570 | { | |
571 | return ceph_ino(inode) == CEPH_INO_ROOT && | |
572 | strncmp(dentry->d_name.name, ".ceph", 5) == 0; | |
573 | } | |
574 | ||
2817b000 SW |
575 | /* |
576 | * Look up a single dir entry. If there is a lookup intent, inform | |
577 | * the MDS so that it gets our 'caps wanted' value in a single op. | |
578 | */ | |
579 | static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry, | |
580 | struct nameidata *nd) | |
581 | { | |
3d14c5d2 YS |
582 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
583 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
584 | struct ceph_mds_request *req; |
585 | int op; | |
586 | int err; | |
587 | ||
588 | dout("lookup %p dentry %p '%.*s'\n", | |
589 | dir, dentry, dentry->d_name.len, dentry->d_name.name); | |
590 | ||
591 | if (dentry->d_name.len > NAME_MAX) | |
592 | return ERR_PTR(-ENAMETOOLONG); | |
593 | ||
594 | err = ceph_init_dentry(dentry); | |
595 | if (err < 0) | |
596 | return ERR_PTR(err); | |
597 | ||
598 | /* open (but not create!) intent? */ | |
599 | if (nd && | |
600 | (nd->flags & LOOKUP_OPEN) && | |
2817b000 SW |
601 | !(nd->intent.open.flags & O_CREAT)) { |
602 | int mode = nd->intent.open.create_mode & ~current->fs->umask; | |
603 | return ceph_lookup_open(dir, dentry, nd, mode, 1); | |
604 | } | |
605 | ||
606 | /* can we conclude ENOENT locally? */ | |
607 | if (dentry->d_inode == NULL) { | |
608 | struct ceph_inode_info *ci = ceph_inode(dir); | |
609 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
610 | ||
611 | spin_lock(&dir->i_lock); | |
612 | dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags); | |
613 | if (strncmp(dentry->d_name.name, | |
3d14c5d2 | 614 | fsc->mount_options->snapdir_name, |
2817b000 | 615 | dentry->d_name.len) && |
1d1de916 | 616 | !is_root_ceph_dentry(dir, dentry) && |
2817b000 SW |
617 | (ci->i_ceph_flags & CEPH_I_COMPLETE) && |
618 | (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) { | |
2817b000 SW |
619 | spin_unlock(&dir->i_lock); |
620 | dout(" dir %p complete, -ENOENT\n", dir); | |
621 | d_add(dentry, NULL); | |
622 | di->lease_shared_gen = ci->i_shared_gen; | |
623 | return NULL; | |
624 | } | |
625 | spin_unlock(&dir->i_lock); | |
626 | } | |
627 | ||
628 | op = ceph_snap(dir) == CEPH_SNAPDIR ? | |
629 | CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; | |
630 | req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); | |
631 | if (IS_ERR(req)) | |
7e34bc52 | 632 | return ERR_CAST(req); |
2817b000 SW |
633 | req->r_dentry = dget(dentry); |
634 | req->r_num_caps = 2; | |
635 | /* we only need inode linkage */ | |
636 | req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); | |
637 | req->r_locked_dir = dir; | |
638 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
468640e3 | 639 | err = ceph_handle_snapdir(req, dentry, err); |
2817b000 SW |
640 | dentry = ceph_finish_lookup(req, dentry, err); |
641 | ceph_mdsc_put_request(req); /* will dput(dentry) */ | |
642 | dout("lookup result=%p\n", dentry); | |
643 | return dentry; | |
644 | } | |
645 | ||
646 | /* | |
647 | * If we do a create but get no trace back from the MDS, follow up with | |
648 | * a lookup (the VFS expects us to link up the provided dentry). | |
649 | */ | |
650 | int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry) | |
651 | { | |
652 | struct dentry *result = ceph_lookup(dir, dentry, NULL); | |
653 | ||
654 | if (result && !IS_ERR(result)) { | |
655 | /* | |
656 | * We created the item, then did a lookup, and found | |
657 | * it was already linked to another inode we already | |
658 | * had in our cache (and thus got spliced). Link our | |
659 | * dentry to that inode, but don't hash it, just in | |
660 | * case the VFS wants to dereference it. | |
661 | */ | |
662 | BUG_ON(!result->d_inode); | |
663 | d_instantiate(dentry, result->d_inode); | |
664 | return 0; | |
665 | } | |
666 | return PTR_ERR(result); | |
667 | } | |
668 | ||
669 | static int ceph_mknod(struct inode *dir, struct dentry *dentry, | |
670 | int mode, dev_t rdev) | |
671 | { | |
3d14c5d2 YS |
672 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
673 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
674 | struct ceph_mds_request *req; |
675 | int err; | |
676 | ||
677 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
678 | return -EROFS; | |
679 | ||
680 | dout("mknod in dir %p dentry %p mode 0%o rdev %d\n", | |
681 | dir, dentry, mode, rdev); | |
682 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS); | |
683 | if (IS_ERR(req)) { | |
684 | d_drop(dentry); | |
685 | return PTR_ERR(req); | |
686 | } | |
687 | req->r_dentry = dget(dentry); | |
688 | req->r_num_caps = 2; | |
689 | req->r_locked_dir = dir; | |
690 | req->r_args.mknod.mode = cpu_to_le32(mode); | |
691 | req->r_args.mknod.rdev = cpu_to_le32(rdev); | |
692 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
693 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
694 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
695 | if (!err && !req->r_reply_info.head->is_dentry) | |
696 | err = ceph_handle_notrace_create(dir, dentry); | |
697 | ceph_mdsc_put_request(req); | |
698 | if (err) | |
699 | d_drop(dentry); | |
700 | return err; | |
701 | } | |
702 | ||
703 | static int ceph_create(struct inode *dir, struct dentry *dentry, int mode, | |
704 | struct nameidata *nd) | |
705 | { | |
706 | dout("create in dir %p dentry %p name '%.*s'\n", | |
707 | dir, dentry, dentry->d_name.len, dentry->d_name.name); | |
708 | ||
709 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
710 | return -EROFS; | |
711 | ||
712 | if (nd) { | |
713 | BUG_ON((nd->flags & LOOKUP_OPEN) == 0); | |
714 | dentry = ceph_lookup_open(dir, dentry, nd, mode, 0); | |
715 | /* hrm, what should i do here if we get aliased? */ | |
716 | if (IS_ERR(dentry)) | |
717 | return PTR_ERR(dentry); | |
718 | return 0; | |
719 | } | |
720 | ||
721 | /* fall back to mknod */ | |
722 | return ceph_mknod(dir, dentry, (mode & ~S_IFMT) | S_IFREG, 0); | |
723 | } | |
724 | ||
725 | static int ceph_symlink(struct inode *dir, struct dentry *dentry, | |
726 | const char *dest) | |
727 | { | |
3d14c5d2 YS |
728 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
729 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
730 | struct ceph_mds_request *req; |
731 | int err; | |
732 | ||
733 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
734 | return -EROFS; | |
735 | ||
736 | dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest); | |
737 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS); | |
738 | if (IS_ERR(req)) { | |
739 | d_drop(dentry); | |
740 | return PTR_ERR(req); | |
741 | } | |
742 | req->r_dentry = dget(dentry); | |
743 | req->r_num_caps = 2; | |
744 | req->r_path2 = kstrdup(dest, GFP_NOFS); | |
745 | req->r_locked_dir = dir; | |
746 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
747 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
748 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
749 | if (!err && !req->r_reply_info.head->is_dentry) | |
750 | err = ceph_handle_notrace_create(dir, dentry); | |
751 | ceph_mdsc_put_request(req); | |
752 | if (err) | |
753 | d_drop(dentry); | |
754 | return err; | |
755 | } | |
756 | ||
757 | static int ceph_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
758 | { | |
3d14c5d2 YS |
759 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
760 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
761 | struct ceph_mds_request *req; |
762 | int err = -EROFS; | |
763 | int op; | |
764 | ||
765 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
766 | /* mkdir .snap/foo is a MKSNAP */ | |
767 | op = CEPH_MDS_OP_MKSNAP; | |
768 | dout("mksnap dir %p snap '%.*s' dn %p\n", dir, | |
769 | dentry->d_name.len, dentry->d_name.name, dentry); | |
770 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { | |
771 | dout("mkdir dir %p dn %p mode 0%o\n", dir, dentry, mode); | |
772 | op = CEPH_MDS_OP_MKDIR; | |
773 | } else { | |
774 | goto out; | |
775 | } | |
776 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
777 | if (IS_ERR(req)) { | |
778 | err = PTR_ERR(req); | |
779 | goto out; | |
780 | } | |
781 | ||
782 | req->r_dentry = dget(dentry); | |
783 | req->r_num_caps = 2; | |
784 | req->r_locked_dir = dir; | |
785 | req->r_args.mkdir.mode = cpu_to_le32(mode); | |
786 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
787 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
788 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
789 | if (!err && !req->r_reply_info.head->is_dentry) | |
790 | err = ceph_handle_notrace_create(dir, dentry); | |
791 | ceph_mdsc_put_request(req); | |
792 | out: | |
793 | if (err < 0) | |
794 | d_drop(dentry); | |
795 | return err; | |
796 | } | |
797 | ||
798 | static int ceph_link(struct dentry *old_dentry, struct inode *dir, | |
799 | struct dentry *dentry) | |
800 | { | |
3d14c5d2 YS |
801 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
802 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
803 | struct ceph_mds_request *req; |
804 | int err; | |
805 | ||
806 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
807 | return -EROFS; | |
808 | ||
809 | dout("link in dir %p old_dentry %p dentry %p\n", dir, | |
810 | old_dentry, dentry); | |
811 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS); | |
812 | if (IS_ERR(req)) { | |
813 | d_drop(dentry); | |
814 | return PTR_ERR(req); | |
815 | } | |
816 | req->r_dentry = dget(dentry); | |
817 | req->r_num_caps = 2; | |
818 | req->r_old_dentry = dget(old_dentry); /* or inode? hrm. */ | |
41b02e1f | 819 | req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry); |
2817b000 SW |
820 | req->r_locked_dir = dir; |
821 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
822 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
823 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
70b666c3 | 824 | if (err) { |
2817b000 | 825 | d_drop(dentry); |
70b666c3 SW |
826 | } else if (!req->r_reply_info.head->is_dentry) { |
827 | ihold(old_dentry->d_inode); | |
828 | d_instantiate(dentry, old_dentry->d_inode); | |
829 | } | |
2817b000 SW |
830 | ceph_mdsc_put_request(req); |
831 | return err; | |
832 | } | |
833 | ||
834 | /* | |
835 | * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it | |
836 | * looks like the link count will hit 0, drop any other caps (other | |
837 | * than PIN) we don't specifically want (due to the file still being | |
838 | * open). | |
839 | */ | |
840 | static int drop_caps_for_unlink(struct inode *inode) | |
841 | { | |
842 | struct ceph_inode_info *ci = ceph_inode(inode); | |
843 | int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; | |
844 | ||
845 | spin_lock(&inode->i_lock); | |
846 | if (inode->i_nlink == 1) { | |
847 | drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN); | |
848 | ci->i_ceph_flags |= CEPH_I_NODELAY; | |
849 | } | |
850 | spin_unlock(&inode->i_lock); | |
851 | return drop; | |
852 | } | |
853 | ||
854 | /* | |
855 | * rmdir and unlink are differ only by the metadata op code | |
856 | */ | |
857 | static int ceph_unlink(struct inode *dir, struct dentry *dentry) | |
858 | { | |
3d14c5d2 YS |
859 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
860 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
861 | struct inode *inode = dentry->d_inode; |
862 | struct ceph_mds_request *req; | |
863 | int err = -EROFS; | |
864 | int op; | |
865 | ||
866 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
867 | /* rmdir .snap/foo is RMSNAP */ | |
868 | dout("rmsnap dir %p '%.*s' dn %p\n", dir, dentry->d_name.len, | |
869 | dentry->d_name.name, dentry); | |
870 | op = CEPH_MDS_OP_RMSNAP; | |
871 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { | |
872 | dout("unlink/rmdir dir %p dn %p inode %p\n", | |
873 | dir, dentry, inode); | |
874 | op = ((dentry->d_inode->i_mode & S_IFMT) == S_IFDIR) ? | |
875 | CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK; | |
876 | } else | |
877 | goto out; | |
878 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
879 | if (IS_ERR(req)) { | |
880 | err = PTR_ERR(req); | |
881 | goto out; | |
882 | } | |
883 | req->r_dentry = dget(dentry); | |
884 | req->r_num_caps = 2; | |
885 | req->r_locked_dir = dir; | |
886 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
887 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
888 | req->r_inode_drop = drop_caps_for_unlink(inode); | |
889 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
890 | if (!err && !req->r_reply_info.head->is_dentry) | |
891 | d_delete(dentry); | |
892 | ceph_mdsc_put_request(req); | |
893 | out: | |
894 | return err; | |
895 | } | |
896 | ||
897 | static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry, | |
898 | struct inode *new_dir, struct dentry *new_dentry) | |
899 | { | |
3d14c5d2 YS |
900 | struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb); |
901 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
902 | struct ceph_mds_request *req; |
903 | int err; | |
904 | ||
905 | if (ceph_snap(old_dir) != ceph_snap(new_dir)) | |
906 | return -EXDEV; | |
907 | if (ceph_snap(old_dir) != CEPH_NOSNAP || | |
908 | ceph_snap(new_dir) != CEPH_NOSNAP) | |
909 | return -EROFS; | |
910 | dout("rename dir %p dentry %p to dir %p dentry %p\n", | |
911 | old_dir, old_dentry, new_dir, new_dentry); | |
912 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RENAME, USE_AUTH_MDS); | |
913 | if (IS_ERR(req)) | |
914 | return PTR_ERR(req); | |
915 | req->r_dentry = dget(new_dentry); | |
916 | req->r_num_caps = 2; | |
917 | req->r_old_dentry = dget(old_dentry); | |
41b02e1f | 918 | req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry); |
2817b000 SW |
919 | req->r_locked_dir = new_dir; |
920 | req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED; | |
921 | req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL; | |
922 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
923 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
924 | /* release LINK_RDCACHE on source inode (mds will lock it) */ | |
925 | req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; | |
926 | if (new_dentry->d_inode) | |
927 | req->r_inode_drop = drop_caps_for_unlink(new_dentry->d_inode); | |
928 | err = ceph_mdsc_do_request(mdsc, old_dir, req); | |
929 | if (!err && !req->r_reply_info.head->is_dentry) { | |
930 | /* | |
931 | * Normally d_move() is done by fill_trace (called by | |
932 | * do_request, above). If there is no trace, we need | |
933 | * to do it here. | |
934 | */ | |
ea1409f9 SW |
935 | |
936 | /* d_move screws up d_subdirs order */ | |
937 | ceph_i_clear(new_dir, CEPH_I_COMPLETE); | |
938 | ||
2817b000 | 939 | d_move(old_dentry, new_dentry); |
ea1409f9 SW |
940 | |
941 | /* ensure target dentry is invalidated, despite | |
942 | rehashing bug in vfs_rename_dir */ | |
81a6cf2d | 943 | ceph_invalidate_dentry_lease(new_dentry); |
2817b000 SW |
944 | } |
945 | ceph_mdsc_put_request(req); | |
946 | return err; | |
947 | } | |
948 | ||
81a6cf2d SW |
949 | /* |
950 | * Ensure a dentry lease will no longer revalidate. | |
951 | */ | |
952 | void ceph_invalidate_dentry_lease(struct dentry *dentry) | |
953 | { | |
954 | spin_lock(&dentry->d_lock); | |
955 | dentry->d_time = jiffies; | |
956 | ceph_dentry(dentry)->lease_shared_gen = 0; | |
957 | spin_unlock(&dentry->d_lock); | |
958 | } | |
2817b000 SW |
959 | |
960 | /* | |
961 | * Check if dentry lease is valid. If not, delete the lease. Try to | |
962 | * renew if the least is more than half up. | |
963 | */ | |
964 | static int dentry_lease_is_valid(struct dentry *dentry) | |
965 | { | |
966 | struct ceph_dentry_info *di; | |
967 | struct ceph_mds_session *s; | |
968 | int valid = 0; | |
969 | u32 gen; | |
970 | unsigned long ttl; | |
971 | struct ceph_mds_session *session = NULL; | |
972 | struct inode *dir = NULL; | |
973 | u32 seq = 0; | |
974 | ||
975 | spin_lock(&dentry->d_lock); | |
976 | di = ceph_dentry(dentry); | |
977 | if (di && di->lease_session) { | |
978 | s = di->lease_session; | |
979 | spin_lock(&s->s_cap_lock); | |
980 | gen = s->s_cap_gen; | |
981 | ttl = s->s_cap_ttl; | |
982 | spin_unlock(&s->s_cap_lock); | |
983 | ||
984 | if (di->lease_gen == gen && | |
985 | time_before(jiffies, dentry->d_time) && | |
986 | time_before(jiffies, ttl)) { | |
987 | valid = 1; | |
988 | if (di->lease_renew_after && | |
989 | time_after(jiffies, di->lease_renew_after)) { | |
990 | /* we should renew */ | |
991 | dir = dentry->d_parent->d_inode; | |
992 | session = ceph_get_mds_session(s); | |
993 | seq = di->lease_seq; | |
994 | di->lease_renew_after = 0; | |
995 | di->lease_renew_from = jiffies; | |
996 | } | |
2817b000 SW |
997 | } |
998 | } | |
999 | spin_unlock(&dentry->d_lock); | |
1000 | ||
1001 | if (session) { | |
1002 | ceph_mdsc_lease_send_msg(session, dir, dentry, | |
1003 | CEPH_MDS_LEASE_RENEW, seq); | |
1004 | ceph_put_mds_session(session); | |
1005 | } | |
1006 | dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid); | |
1007 | return valid; | |
1008 | } | |
1009 | ||
1010 | /* | |
1011 | * Check if directory-wide content lease/cap is valid. | |
1012 | */ | |
1013 | static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry) | |
1014 | { | |
1015 | struct ceph_inode_info *ci = ceph_inode(dir); | |
1016 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
1017 | int valid = 0; | |
1018 | ||
1019 | spin_lock(&dir->i_lock); | |
1020 | if (ci->i_shared_gen == di->lease_shared_gen) | |
1021 | valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1); | |
1022 | spin_unlock(&dir->i_lock); | |
1023 | dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n", | |
1024 | dir, (unsigned)ci->i_shared_gen, dentry, | |
1025 | (unsigned)di->lease_shared_gen, valid); | |
1026 | return valid; | |
1027 | } | |
1028 | ||
1029 | /* | |
1030 | * Check if cached dentry can be trusted. | |
1031 | */ | |
1032 | static int ceph_d_revalidate(struct dentry *dentry, struct nameidata *nd) | |
1033 | { | |
bf1c6aca | 1034 | int valid = 0; |
34286d66 NP |
1035 | struct inode *dir; |
1036 | ||
0eb980e3 | 1037 | if (nd && nd->flags & LOOKUP_RCU) |
34286d66 NP |
1038 | return -ECHILD; |
1039 | ||
1cd3935b SW |
1040 | dout("d_revalidate %p '%.*s' inode %p offset %lld\n", dentry, |
1041 | dentry->d_name.len, dentry->d_name.name, dentry->d_inode, | |
1042 | ceph_dentry(dentry)->offset); | |
2817b000 | 1043 | |
bf1c6aca SW |
1044 | dir = ceph_get_dentry_parent_inode(dentry); |
1045 | ||
2817b000 SW |
1046 | /* always trust cached snapped dentries, snapdir dentry */ |
1047 | if (ceph_snap(dir) != CEPH_NOSNAP) { | |
1048 | dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry, | |
1049 | dentry->d_name.len, dentry->d_name.name, dentry->d_inode); | |
bf1c6aca SW |
1050 | valid = 1; |
1051 | } else if (dentry->d_inode && | |
1052 | ceph_snap(dentry->d_inode) == CEPH_SNAPDIR) { | |
1053 | valid = 1; | |
1054 | } else if (dentry_lease_is_valid(dentry) || | |
1055 | dir_lease_is_valid(dir, dentry)) { | |
1056 | valid = 1; | |
2817b000 | 1057 | } |
2817b000 | 1058 | |
bf1c6aca SW |
1059 | dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid"); |
1060 | if (valid) | |
1061 | ceph_dentry_lru_touch(dentry); | |
1062 | else | |
1063 | d_drop(dentry); | |
1064 | iput(dir); | |
1065 | return valid; | |
2817b000 SW |
1066 | } |
1067 | ||
1068 | /* | |
147851d2 | 1069 | * Release our ceph_dentry_info. |
2817b000 | 1070 | */ |
147851d2 | 1071 | static void ceph_d_release(struct dentry *dentry) |
2817b000 SW |
1072 | { |
1073 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
2817b000 | 1074 | |
147851d2 | 1075 | dout("d_release %p\n", dentry); |
2817b000 SW |
1076 | if (di) { |
1077 | ceph_dentry_lru_del(dentry); | |
1078 | if (di->lease_session) | |
1079 | ceph_put_mds_session(di->lease_session); | |
1080 | kmem_cache_free(ceph_dentry_cachep, di); | |
1081 | dentry->d_fsdata = NULL; | |
1082 | } | |
1083 | } | |
1084 | ||
1085 | static int ceph_snapdir_d_revalidate(struct dentry *dentry, | |
1086 | struct nameidata *nd) | |
1087 | { | |
1088 | /* | |
1089 | * Eventually, we'll want to revalidate snapped metadata | |
1090 | * too... probably... | |
1091 | */ | |
1092 | return 1; | |
1093 | } | |
1094 | ||
1095 | ||
1096 | ||
1097 | /* | |
1098 | * read() on a dir. This weird interface hack only works if mounted | |
1099 | * with '-o dirstat'. | |
1100 | */ | |
1101 | static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, | |
1102 | loff_t *ppos) | |
1103 | { | |
1104 | struct ceph_file_info *cf = file->private_data; | |
1105 | struct inode *inode = file->f_dentry->d_inode; | |
1106 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1107 | int left; | |
ae598083 | 1108 | const int bufsize = 1024; |
2817b000 | 1109 | |
3d14c5d2 | 1110 | if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT)) |
2817b000 SW |
1111 | return -EISDIR; |
1112 | ||
1113 | if (!cf->dir_info) { | |
ae598083 | 1114 | cf->dir_info = kmalloc(bufsize, GFP_NOFS); |
2817b000 SW |
1115 | if (!cf->dir_info) |
1116 | return -ENOMEM; | |
1117 | cf->dir_info_len = | |
ae598083 | 1118 | snprintf(cf->dir_info, bufsize, |
2817b000 SW |
1119 | "entries: %20lld\n" |
1120 | " files: %20lld\n" | |
1121 | " subdirs: %20lld\n" | |
1122 | "rentries: %20lld\n" | |
1123 | " rfiles: %20lld\n" | |
1124 | " rsubdirs: %20lld\n" | |
1125 | "rbytes: %20lld\n" | |
1126 | "rctime: %10ld.%09ld\n", | |
1127 | ci->i_files + ci->i_subdirs, | |
1128 | ci->i_files, | |
1129 | ci->i_subdirs, | |
1130 | ci->i_rfiles + ci->i_rsubdirs, | |
1131 | ci->i_rfiles, | |
1132 | ci->i_rsubdirs, | |
1133 | ci->i_rbytes, | |
1134 | (long)ci->i_rctime.tv_sec, | |
1135 | (long)ci->i_rctime.tv_nsec); | |
1136 | } | |
1137 | ||
1138 | if (*ppos >= cf->dir_info_len) | |
1139 | return 0; | |
1140 | size = min_t(unsigned, size, cf->dir_info_len-*ppos); | |
1141 | left = copy_to_user(buf, cf->dir_info + *ppos, size); | |
1142 | if (left == size) | |
1143 | return -EFAULT; | |
1144 | *ppos += (size - left); | |
1145 | return size - left; | |
1146 | } | |
1147 | ||
1148 | /* | |
1149 | * an fsync() on a dir will wait for any uncommitted directory | |
1150 | * operations to commit. | |
1151 | */ | |
02c24a82 JB |
1152 | static int ceph_dir_fsync(struct file *file, loff_t start, loff_t end, |
1153 | int datasync) | |
2817b000 | 1154 | { |
7ea80859 | 1155 | struct inode *inode = file->f_path.dentry->d_inode; |
2817b000 SW |
1156 | struct ceph_inode_info *ci = ceph_inode(inode); |
1157 | struct list_head *head = &ci->i_unsafe_dirops; | |
1158 | struct ceph_mds_request *req; | |
1159 | u64 last_tid; | |
1160 | int ret = 0; | |
1161 | ||
1162 | dout("dir_fsync %p\n", inode); | |
02c24a82 JB |
1163 | ret = filemap_write_and_wait_range(inode->i_mapping, start, end); |
1164 | if (ret) | |
1165 | return ret; | |
1166 | mutex_lock(&inode->i_mutex); | |
1167 | ||
2817b000 SW |
1168 | spin_lock(&ci->i_unsafe_lock); |
1169 | if (list_empty(head)) | |
1170 | goto out; | |
1171 | ||
1172 | req = list_entry(head->prev, | |
1173 | struct ceph_mds_request, r_unsafe_dir_item); | |
1174 | last_tid = req->r_tid; | |
1175 | ||
1176 | do { | |
1177 | ceph_mdsc_get_request(req); | |
1178 | spin_unlock(&ci->i_unsafe_lock); | |
1179 | dout("dir_fsync %p wait on tid %llu (until %llu)\n", | |
1180 | inode, req->r_tid, last_tid); | |
1181 | if (req->r_timeout) { | |
1182 | ret = wait_for_completion_timeout( | |
1183 | &req->r_safe_completion, req->r_timeout); | |
1184 | if (ret > 0) | |
1185 | ret = 0; | |
1186 | else if (ret == 0) | |
1187 | ret = -EIO; /* timed out */ | |
1188 | } else { | |
1189 | wait_for_completion(&req->r_safe_completion); | |
1190 | } | |
1191 | spin_lock(&ci->i_unsafe_lock); | |
1192 | ceph_mdsc_put_request(req); | |
1193 | ||
1194 | if (ret || list_empty(head)) | |
1195 | break; | |
1196 | req = list_entry(head->next, | |
1197 | struct ceph_mds_request, r_unsafe_dir_item); | |
1198 | } while (req->r_tid < last_tid); | |
1199 | out: | |
1200 | spin_unlock(&ci->i_unsafe_lock); | |
02c24a82 JB |
1201 | mutex_unlock(&inode->i_mutex); |
1202 | ||
2817b000 SW |
1203 | return ret; |
1204 | } | |
1205 | ||
1206 | /* | |
1207 | * We maintain a private dentry LRU. | |
1208 | * | |
1209 | * FIXME: this needs to be changed to a per-mds lru to be useful. | |
1210 | */ | |
1211 | void ceph_dentry_lru_add(struct dentry *dn) | |
1212 | { | |
1213 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1214 | struct ceph_mds_client *mdsc; | |
2817b000 | 1215 | |
04a419f9 SW |
1216 | dout("dentry_lru_add %p %p '%.*s'\n", di, dn, |
1217 | dn->d_name.len, dn->d_name.name); | |
2817b000 | 1218 | if (di) { |
3d14c5d2 | 1219 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
2817b000 SW |
1220 | spin_lock(&mdsc->dentry_lru_lock); |
1221 | list_add_tail(&di->lru, &mdsc->dentry_lru); | |
1222 | mdsc->num_dentry++; | |
1223 | spin_unlock(&mdsc->dentry_lru_lock); | |
1224 | } | |
1225 | } | |
1226 | ||
1227 | void ceph_dentry_lru_touch(struct dentry *dn) | |
1228 | { | |
1229 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1230 | struct ceph_mds_client *mdsc; | |
2817b000 | 1231 | |
1cd3935b SW |
1232 | dout("dentry_lru_touch %p %p '%.*s' (offset %lld)\n", di, dn, |
1233 | dn->d_name.len, dn->d_name.name, di->offset); | |
2817b000 | 1234 | if (di) { |
3d14c5d2 | 1235 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
2817b000 SW |
1236 | spin_lock(&mdsc->dentry_lru_lock); |
1237 | list_move_tail(&di->lru, &mdsc->dentry_lru); | |
1238 | spin_unlock(&mdsc->dentry_lru_lock); | |
1239 | } | |
1240 | } | |
1241 | ||
1242 | void ceph_dentry_lru_del(struct dentry *dn) | |
1243 | { | |
1244 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1245 | struct ceph_mds_client *mdsc; | |
1246 | ||
04a419f9 SW |
1247 | dout("dentry_lru_del %p %p '%.*s'\n", di, dn, |
1248 | dn->d_name.len, dn->d_name.name); | |
2817b000 | 1249 | if (di) { |
3d14c5d2 | 1250 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
2817b000 SW |
1251 | spin_lock(&mdsc->dentry_lru_lock); |
1252 | list_del_init(&di->lru); | |
1253 | mdsc->num_dentry--; | |
1254 | spin_unlock(&mdsc->dentry_lru_lock); | |
1255 | } | |
1256 | } | |
1257 | ||
6c0f3af7 SW |
1258 | /* |
1259 | * Return name hash for a given dentry. This is dependent on | |
1260 | * the parent directory's hash function. | |
1261 | */ | |
e5f86dc3 | 1262 | unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn) |
6c0f3af7 | 1263 | { |
6c0f3af7 SW |
1264 | struct ceph_inode_info *dci = ceph_inode(dir); |
1265 | ||
1266 | switch (dci->i_dir_layout.dl_dir_hash) { | |
1267 | case 0: /* for backward compat */ | |
1268 | case CEPH_STR_HASH_LINUX: | |
1269 | return dn->d_name.hash; | |
1270 | ||
1271 | default: | |
1272 | return ceph_str_hash(dci->i_dir_layout.dl_dir_hash, | |
1273 | dn->d_name.name, dn->d_name.len); | |
1274 | } | |
1275 | } | |
1276 | ||
2817b000 SW |
1277 | const struct file_operations ceph_dir_fops = { |
1278 | .read = ceph_read_dir, | |
1279 | .readdir = ceph_readdir, | |
1280 | .llseek = ceph_dir_llseek, | |
1281 | .open = ceph_open, | |
1282 | .release = ceph_release, | |
1283 | .unlocked_ioctl = ceph_ioctl, | |
1284 | .fsync = ceph_dir_fsync, | |
1285 | }; | |
1286 | ||
1287 | const struct inode_operations ceph_dir_iops = { | |
1288 | .lookup = ceph_lookup, | |
1289 | .permission = ceph_permission, | |
1290 | .getattr = ceph_getattr, | |
1291 | .setattr = ceph_setattr, | |
1292 | .setxattr = ceph_setxattr, | |
1293 | .getxattr = ceph_getxattr, | |
1294 | .listxattr = ceph_listxattr, | |
1295 | .removexattr = ceph_removexattr, | |
1296 | .mknod = ceph_mknod, | |
1297 | .symlink = ceph_symlink, | |
1298 | .mkdir = ceph_mkdir, | |
1299 | .link = ceph_link, | |
1300 | .unlink = ceph_unlink, | |
1301 | .rmdir = ceph_unlink, | |
1302 | .rename = ceph_rename, | |
1303 | .create = ceph_create, | |
1304 | }; | |
1305 | ||
52dfb8ac | 1306 | const struct dentry_operations ceph_dentry_ops = { |
2817b000 | 1307 | .d_revalidate = ceph_d_revalidate, |
147851d2 | 1308 | .d_release = ceph_d_release, |
2817b000 SW |
1309 | }; |
1310 | ||
52dfb8ac | 1311 | const struct dentry_operations ceph_snapdir_dentry_ops = { |
2817b000 | 1312 | .d_revalidate = ceph_snapdir_d_revalidate, |
147851d2 | 1313 | .d_release = ceph_d_release, |
2817b000 SW |
1314 | }; |
1315 | ||
52dfb8ac | 1316 | const struct dentry_operations ceph_snap_dentry_ops = { |
147851d2 | 1317 | .d_release = ceph_d_release, |
2817b000 | 1318 | }; |