]>
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 | * | |
c6ffe100 | 111 | * D_COMPLETE tells indicates we have all dentries in the dir. It is |
2817b000 SW |
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 */ |
c6ffe100 SW |
202 | if (!ceph_dir_test_complete(dir)) { |
203 | dout(" lost D_COMPLETE on %p; falling back to mds\n", dir); | |
efa4c120 SW |
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? */ | |
be655596 | 284 | spin_lock(&ci->i_ceph_lock); |
2817b000 | 285 | if ((filp->f_pos == 2 || fi->dentry) && |
3d14c5d2 | 286 | !ceph_test_mount_opt(fsc, NOASYNCREADDIR) && |
a0dff78d | 287 | ceph_snap(inode) != CEPH_SNAPDIR && |
c6ffe100 | 288 | ceph_dir_test_complete(inode) && |
2817b000 | 289 | __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) { |
be655596 | 290 | spin_unlock(&ci->i_ceph_lock); |
2817b000 | 291 | err = __dcache_readdir(filp, dirent, filldir); |
efa4c120 | 292 | if (err != -EAGAIN) |
2817b000 | 293 | return err; |
efa4c120 | 294 | } else { |
be655596 | 295 | spin_unlock(&ci->i_ceph_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"); | |
c6ffe100 | 354 | fi->dir_release_count--; /* preclude D_COMPLETE */ |
2817b000 SW |
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 | */ | |
be655596 | 431 | spin_lock(&ci->i_ceph_lock); |
2817b000 | 432 | if (ci->i_release_count == fi->dir_release_count) { |
c6ffe100 | 433 | ceph_dir_set_complete(inode); |
2817b000 SW |
434 | ci->i_max_offset = filp->f_pos; |
435 | } | |
be655596 | 436 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
437 | |
438 | dout("readdir %p filp %p done.\n", inode, filp); | |
439 | return 0; | |
440 | } | |
441 | ||
442 | static void reset_readdir(struct ceph_file_info *fi) | |
443 | { | |
444 | if (fi->last_readdir) { | |
445 | ceph_mdsc_put_request(fi->last_readdir); | |
446 | fi->last_readdir = NULL; | |
447 | } | |
448 | kfree(fi->last_name); | |
a1629c3b | 449 | fi->last_name = NULL; |
2817b000 SW |
450 | fi->next_offset = 2; /* compensate for . and .. */ |
451 | if (fi->dentry) { | |
452 | dput(fi->dentry); | |
453 | fi->dentry = NULL; | |
454 | } | |
9cfa1098 | 455 | fi->flags &= ~CEPH_F_ATEND; |
2817b000 SW |
456 | } |
457 | ||
458 | static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int origin) | |
459 | { | |
460 | struct ceph_file_info *fi = file->private_data; | |
461 | struct inode *inode = file->f_mapping->host; | |
462 | loff_t old_offset = offset; | |
463 | loff_t retval; | |
464 | ||
465 | mutex_lock(&inode->i_mutex); | |
06222e49 | 466 | retval = -EINVAL; |
2817b000 SW |
467 | switch (origin) { |
468 | case SEEK_END: | |
469 | offset += inode->i_size + 2; /* FIXME */ | |
470 | break; | |
471 | case SEEK_CUR: | |
472 | offset += file->f_pos; | |
06222e49 JB |
473 | case SEEK_SET: |
474 | break; | |
475 | default: | |
476 | goto out; | |
2817b000 | 477 | } |
06222e49 | 478 | |
2817b000 SW |
479 | if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) { |
480 | if (offset != file->f_pos) { | |
481 | file->f_pos = offset; | |
482 | file->f_version = 0; | |
9cfa1098 | 483 | fi->flags &= ~CEPH_F_ATEND; |
2817b000 SW |
484 | } |
485 | retval = offset; | |
486 | ||
487 | /* | |
488 | * discard buffered readdir content on seekdir(0), or | |
489 | * seek to new frag, or seek prior to current chunk. | |
490 | */ | |
491 | if (offset == 0 || | |
492 | fpos_frag(offset) != fpos_frag(old_offset) || | |
493 | fpos_off(offset) < fi->offset) { | |
494 | dout("dir_llseek dropping %p content\n", file); | |
495 | reset_readdir(fi); | |
496 | } | |
497 | ||
498 | /* bump dir_release_count if we did a forward seek */ | |
499 | if (offset > old_offset) | |
500 | fi->dir_release_count--; | |
501 | } | |
06222e49 | 502 | out: |
2817b000 SW |
503 | mutex_unlock(&inode->i_mutex); |
504 | return retval; | |
505 | } | |
506 | ||
507 | /* | |
468640e3 | 508 | * Handle lookups for the hidden .snap directory. |
2817b000 | 509 | */ |
468640e3 SW |
510 | int ceph_handle_snapdir(struct ceph_mds_request *req, |
511 | struct dentry *dentry, int err) | |
2817b000 | 512 | { |
3d14c5d2 | 513 | struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); |
d79698da | 514 | struct inode *parent = dentry->d_parent->d_inode; /* we hold i_mutex */ |
2817b000 SW |
515 | |
516 | /* .snap dir? */ | |
517 | if (err == -ENOENT && | |
455cec0a | 518 | ceph_snap(parent) == CEPH_NOSNAP && |
6b805185 | 519 | strcmp(dentry->d_name.name, |
3d14c5d2 | 520 | fsc->mount_options->snapdir_name) == 0) { |
2817b000 SW |
521 | struct inode *inode = ceph_get_snapdir(parent); |
522 | dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p\n", | |
523 | dentry, dentry->d_name.len, dentry->d_name.name, inode); | |
9358c6d4 | 524 | BUG_ON(!d_unhashed(dentry)); |
2817b000 SW |
525 | d_add(dentry, inode); |
526 | err = 0; | |
527 | } | |
468640e3 SW |
528 | return err; |
529 | } | |
2817b000 | 530 | |
468640e3 SW |
531 | /* |
532 | * Figure out final result of a lookup/open request. | |
533 | * | |
534 | * Mainly, make sure we return the final req->r_dentry (if it already | |
535 | * existed) in place of the original VFS-provided dentry when they | |
536 | * differ. | |
537 | * | |
538 | * Gracefully handle the case where the MDS replies with -ENOENT and | |
539 | * no trace (which it may do, at its discretion, e.g., if it doesn't | |
540 | * care to issue a lease on the negative dentry). | |
541 | */ | |
542 | struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, | |
543 | struct dentry *dentry, int err) | |
544 | { | |
2817b000 SW |
545 | if (err == -ENOENT) { |
546 | /* no trace? */ | |
547 | err = 0; | |
548 | if (!req->r_reply_info.head->is_dentry) { | |
549 | dout("ENOENT and no trace, dentry %p inode %p\n", | |
550 | dentry, dentry->d_inode); | |
551 | if (dentry->d_inode) { | |
552 | d_drop(dentry); | |
553 | err = -ENOENT; | |
554 | } else { | |
555 | d_add(dentry, NULL); | |
556 | } | |
557 | } | |
558 | } | |
559 | if (err) | |
560 | dentry = ERR_PTR(err); | |
561 | else if (dentry != req->r_dentry) | |
562 | dentry = dget(req->r_dentry); /* we got spliced */ | |
563 | else | |
564 | dentry = NULL; | |
565 | return dentry; | |
566 | } | |
567 | ||
1d1de916 SW |
568 | static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry) |
569 | { | |
570 | return ceph_ino(inode) == CEPH_INO_ROOT && | |
571 | strncmp(dentry->d_name.name, ".ceph", 5) == 0; | |
572 | } | |
573 | ||
2817b000 SW |
574 | /* |
575 | * Look up a single dir entry. If there is a lookup intent, inform | |
576 | * the MDS so that it gets our 'caps wanted' value in a single op. | |
577 | */ | |
578 | static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry, | |
579 | struct nameidata *nd) | |
580 | { | |
3d14c5d2 YS |
581 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
582 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
583 | struct ceph_mds_request *req; |
584 | int op; | |
585 | int err; | |
586 | ||
587 | dout("lookup %p dentry %p '%.*s'\n", | |
588 | dir, dentry, dentry->d_name.len, dentry->d_name.name); | |
589 | ||
590 | if (dentry->d_name.len > NAME_MAX) | |
591 | return ERR_PTR(-ENAMETOOLONG); | |
592 | ||
593 | err = ceph_init_dentry(dentry); | |
594 | if (err < 0) | |
595 | return ERR_PTR(err); | |
596 | ||
2817b000 SW |
597 | /* can we conclude ENOENT locally? */ |
598 | if (dentry->d_inode == NULL) { | |
599 | struct ceph_inode_info *ci = ceph_inode(dir); | |
600 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
601 | ||
be655596 | 602 | spin_lock(&ci->i_ceph_lock); |
2817b000 SW |
603 | dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags); |
604 | if (strncmp(dentry->d_name.name, | |
3d14c5d2 | 605 | fsc->mount_options->snapdir_name, |
2817b000 | 606 | dentry->d_name.len) && |
1d1de916 | 607 | !is_root_ceph_dentry(dir, dentry) && |
c6ffe100 | 608 | ceph_dir_test_complete(dir) && |
2817b000 | 609 | (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) { |
be655596 | 610 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
611 | dout(" dir %p complete, -ENOENT\n", dir); |
612 | d_add(dentry, NULL); | |
613 | di->lease_shared_gen = ci->i_shared_gen; | |
614 | return NULL; | |
615 | } | |
be655596 | 616 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
617 | } |
618 | ||
619 | op = ceph_snap(dir) == CEPH_SNAPDIR ? | |
620 | CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; | |
621 | req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); | |
622 | if (IS_ERR(req)) | |
7e34bc52 | 623 | return ERR_CAST(req); |
2817b000 SW |
624 | req->r_dentry = dget(dentry); |
625 | req->r_num_caps = 2; | |
626 | /* we only need inode linkage */ | |
627 | req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); | |
628 | req->r_locked_dir = dir; | |
629 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
468640e3 | 630 | err = ceph_handle_snapdir(req, dentry, err); |
2817b000 SW |
631 | dentry = ceph_finish_lookup(req, dentry, err); |
632 | ceph_mdsc_put_request(req); /* will dput(dentry) */ | |
633 | dout("lookup result=%p\n", dentry); | |
634 | return dentry; | |
635 | } | |
636 | ||
d9585277 | 637 | int ceph_atomic_open(struct inode *dir, struct dentry *dentry, |
30d90494 | 638 | struct file *file, unsigned flags, umode_t mode, |
d9585277 | 639 | int *opened) |
2d83bde9 MS |
640 | { |
641 | int err; | |
642 | struct dentry *res = NULL; | |
2d83bde9 MS |
643 | |
644 | if (!(flags & O_CREAT)) { | |
645 | if (dentry->d_name.len > NAME_MAX) | |
d9585277 | 646 | return -ENAMETOOLONG; |
2d83bde9 MS |
647 | |
648 | err = ceph_init_dentry(dentry); | |
649 | if (err < 0) | |
d9585277 | 650 | return err; |
2d83bde9 | 651 | |
30d90494 | 652 | return ceph_lookup_open(dir, dentry, file, flags, mode, opened); |
2d83bde9 MS |
653 | } |
654 | ||
655 | if (d_unhashed(dentry)) { | |
656 | res = ceph_lookup(dir, dentry, NULL); | |
657 | if (IS_ERR(res)) | |
d9585277 | 658 | return PTR_ERR(res); |
2d83bde9 MS |
659 | |
660 | if (res) | |
661 | dentry = res; | |
662 | } | |
663 | ||
664 | /* We don't deal with positive dentries here */ | |
e45198a6 AV |
665 | if (dentry->d_inode) |
666 | return finish_no_open(file, res); | |
2d83bde9 | 667 | |
47237687 | 668 | *opened |= FILE_CREATED; |
30d90494 | 669 | err = ceph_lookup_open(dir, dentry, file, flags, mode, opened); |
2d83bde9 MS |
670 | dput(res); |
671 | ||
d9585277 | 672 | return err; |
2d83bde9 MS |
673 | } |
674 | ||
2817b000 SW |
675 | /* |
676 | * If we do a create but get no trace back from the MDS, follow up with | |
677 | * a lookup (the VFS expects us to link up the provided dentry). | |
678 | */ | |
679 | int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry) | |
680 | { | |
681 | struct dentry *result = ceph_lookup(dir, dentry, NULL); | |
682 | ||
683 | if (result && !IS_ERR(result)) { | |
684 | /* | |
685 | * We created the item, then did a lookup, and found | |
686 | * it was already linked to another inode we already | |
687 | * had in our cache (and thus got spliced). Link our | |
688 | * dentry to that inode, but don't hash it, just in | |
689 | * case the VFS wants to dereference it. | |
690 | */ | |
691 | BUG_ON(!result->d_inode); | |
692 | d_instantiate(dentry, result->d_inode); | |
693 | return 0; | |
694 | } | |
695 | return PTR_ERR(result); | |
696 | } | |
697 | ||
698 | static int ceph_mknod(struct inode *dir, struct dentry *dentry, | |
1a67aafb | 699 | umode_t mode, dev_t rdev) |
2817b000 | 700 | { |
3d14c5d2 YS |
701 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
702 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
703 | struct ceph_mds_request *req; |
704 | int err; | |
705 | ||
706 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
707 | return -EROFS; | |
708 | ||
1a67aafb | 709 | dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n", |
2817b000 SW |
710 | dir, dentry, mode, rdev); |
711 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS); | |
712 | if (IS_ERR(req)) { | |
713 | d_drop(dentry); | |
714 | return PTR_ERR(req); | |
715 | } | |
716 | req->r_dentry = dget(dentry); | |
717 | req->r_num_caps = 2; | |
718 | req->r_locked_dir = dir; | |
719 | req->r_args.mknod.mode = cpu_to_le32(mode); | |
720 | req->r_args.mknod.rdev = cpu_to_le32(rdev); | |
721 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
722 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
723 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
724 | if (!err && !req->r_reply_info.head->is_dentry) | |
725 | err = ceph_handle_notrace_create(dir, dentry); | |
726 | ceph_mdsc_put_request(req); | |
727 | if (err) | |
728 | d_drop(dentry); | |
729 | return err; | |
730 | } | |
731 | ||
4acdaf27 | 732 | static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
2817b000 SW |
733 | struct nameidata *nd) |
734 | { | |
2d83bde9 | 735 | return ceph_mknod(dir, dentry, mode, 0); |
2817b000 SW |
736 | } |
737 | ||
738 | static int ceph_symlink(struct inode *dir, struct dentry *dentry, | |
739 | const char *dest) | |
740 | { | |
3d14c5d2 YS |
741 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
742 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
743 | struct ceph_mds_request *req; |
744 | int err; | |
745 | ||
746 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
747 | return -EROFS; | |
748 | ||
749 | dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest); | |
750 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS); | |
751 | if (IS_ERR(req)) { | |
752 | d_drop(dentry); | |
753 | return PTR_ERR(req); | |
754 | } | |
755 | req->r_dentry = dget(dentry); | |
756 | req->r_num_caps = 2; | |
757 | req->r_path2 = kstrdup(dest, GFP_NOFS); | |
758 | req->r_locked_dir = dir; | |
759 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
760 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
761 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
762 | if (!err && !req->r_reply_info.head->is_dentry) | |
763 | err = ceph_handle_notrace_create(dir, dentry); | |
764 | ceph_mdsc_put_request(req); | |
765 | if (err) | |
766 | d_drop(dentry); | |
767 | return err; | |
768 | } | |
769 | ||
18bb1db3 | 770 | static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
2817b000 | 771 | { |
3d14c5d2 YS |
772 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
773 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
774 | struct ceph_mds_request *req; |
775 | int err = -EROFS; | |
776 | int op; | |
777 | ||
778 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
779 | /* mkdir .snap/foo is a MKSNAP */ | |
780 | op = CEPH_MDS_OP_MKSNAP; | |
781 | dout("mksnap dir %p snap '%.*s' dn %p\n", dir, | |
782 | dentry->d_name.len, dentry->d_name.name, dentry); | |
783 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { | |
18bb1db3 | 784 | dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode); |
2817b000 SW |
785 | op = CEPH_MDS_OP_MKDIR; |
786 | } else { | |
787 | goto out; | |
788 | } | |
789 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
790 | if (IS_ERR(req)) { | |
791 | err = PTR_ERR(req); | |
792 | goto out; | |
793 | } | |
794 | ||
795 | req->r_dentry = dget(dentry); | |
796 | req->r_num_caps = 2; | |
797 | req->r_locked_dir = dir; | |
798 | req->r_args.mkdir.mode = cpu_to_le32(mode); | |
799 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
800 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
801 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
802 | if (!err && !req->r_reply_info.head->is_dentry) | |
803 | err = ceph_handle_notrace_create(dir, dentry); | |
804 | ceph_mdsc_put_request(req); | |
805 | out: | |
806 | if (err < 0) | |
807 | d_drop(dentry); | |
808 | return err; | |
809 | } | |
810 | ||
811 | static int ceph_link(struct dentry *old_dentry, struct inode *dir, | |
812 | struct dentry *dentry) | |
813 | { | |
3d14c5d2 YS |
814 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
815 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
816 | struct ceph_mds_request *req; |
817 | int err; | |
818 | ||
819 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
820 | return -EROFS; | |
821 | ||
822 | dout("link in dir %p old_dentry %p dentry %p\n", dir, | |
823 | old_dentry, dentry); | |
824 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS); | |
825 | if (IS_ERR(req)) { | |
826 | d_drop(dentry); | |
827 | return PTR_ERR(req); | |
828 | } | |
829 | req->r_dentry = dget(dentry); | |
830 | req->r_num_caps = 2; | |
831 | req->r_old_dentry = dget(old_dentry); /* or inode? hrm. */ | |
41b02e1f | 832 | req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry); |
2817b000 SW |
833 | req->r_locked_dir = dir; |
834 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
835 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
836 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
70b666c3 | 837 | if (err) { |
2817b000 | 838 | d_drop(dentry); |
70b666c3 SW |
839 | } else if (!req->r_reply_info.head->is_dentry) { |
840 | ihold(old_dentry->d_inode); | |
841 | d_instantiate(dentry, old_dentry->d_inode); | |
842 | } | |
2817b000 SW |
843 | ceph_mdsc_put_request(req); |
844 | return err; | |
845 | } | |
846 | ||
847 | /* | |
848 | * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it | |
849 | * looks like the link count will hit 0, drop any other caps (other | |
850 | * than PIN) we don't specifically want (due to the file still being | |
851 | * open). | |
852 | */ | |
853 | static int drop_caps_for_unlink(struct inode *inode) | |
854 | { | |
855 | struct ceph_inode_info *ci = ceph_inode(inode); | |
856 | int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; | |
857 | ||
be655596 | 858 | spin_lock(&ci->i_ceph_lock); |
2817b000 SW |
859 | if (inode->i_nlink == 1) { |
860 | drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN); | |
861 | ci->i_ceph_flags |= CEPH_I_NODELAY; | |
862 | } | |
be655596 | 863 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
864 | return drop; |
865 | } | |
866 | ||
867 | /* | |
868 | * rmdir and unlink are differ only by the metadata op code | |
869 | */ | |
870 | static int ceph_unlink(struct inode *dir, struct dentry *dentry) | |
871 | { | |
3d14c5d2 YS |
872 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
873 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
874 | struct inode *inode = dentry->d_inode; |
875 | struct ceph_mds_request *req; | |
876 | int err = -EROFS; | |
877 | int op; | |
878 | ||
879 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
880 | /* rmdir .snap/foo is RMSNAP */ | |
881 | dout("rmsnap dir %p '%.*s' dn %p\n", dir, dentry->d_name.len, | |
882 | dentry->d_name.name, dentry); | |
883 | op = CEPH_MDS_OP_RMSNAP; | |
884 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { | |
885 | dout("unlink/rmdir dir %p dn %p inode %p\n", | |
886 | dir, dentry, inode); | |
dba19c60 | 887 | op = S_ISDIR(dentry->d_inode->i_mode) ? |
2817b000 SW |
888 | CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK; |
889 | } else | |
890 | goto out; | |
891 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
892 | if (IS_ERR(req)) { | |
893 | err = PTR_ERR(req); | |
894 | goto out; | |
895 | } | |
896 | req->r_dentry = dget(dentry); | |
897 | req->r_num_caps = 2; | |
898 | req->r_locked_dir = dir; | |
899 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
900 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
901 | req->r_inode_drop = drop_caps_for_unlink(inode); | |
902 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
903 | if (!err && !req->r_reply_info.head->is_dentry) | |
904 | d_delete(dentry); | |
905 | ceph_mdsc_put_request(req); | |
906 | out: | |
907 | return err; | |
908 | } | |
909 | ||
910 | static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry, | |
911 | struct inode *new_dir, struct dentry *new_dentry) | |
912 | { | |
3d14c5d2 YS |
913 | struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb); |
914 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
915 | struct ceph_mds_request *req; |
916 | int err; | |
917 | ||
918 | if (ceph_snap(old_dir) != ceph_snap(new_dir)) | |
919 | return -EXDEV; | |
920 | if (ceph_snap(old_dir) != CEPH_NOSNAP || | |
921 | ceph_snap(new_dir) != CEPH_NOSNAP) | |
922 | return -EROFS; | |
923 | dout("rename dir %p dentry %p to dir %p dentry %p\n", | |
924 | old_dir, old_dentry, new_dir, new_dentry); | |
925 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RENAME, USE_AUTH_MDS); | |
926 | if (IS_ERR(req)) | |
927 | return PTR_ERR(req); | |
928 | req->r_dentry = dget(new_dentry); | |
929 | req->r_num_caps = 2; | |
930 | req->r_old_dentry = dget(old_dentry); | |
41b02e1f | 931 | req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry); |
2817b000 SW |
932 | req->r_locked_dir = new_dir; |
933 | req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED; | |
934 | req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL; | |
935 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
936 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
937 | /* release LINK_RDCACHE on source inode (mds will lock it) */ | |
938 | req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; | |
939 | if (new_dentry->d_inode) | |
940 | req->r_inode_drop = drop_caps_for_unlink(new_dentry->d_inode); | |
941 | err = ceph_mdsc_do_request(mdsc, old_dir, req); | |
942 | if (!err && !req->r_reply_info.head->is_dentry) { | |
943 | /* | |
944 | * Normally d_move() is done by fill_trace (called by | |
945 | * do_request, above). If there is no trace, we need | |
946 | * to do it here. | |
947 | */ | |
ea1409f9 SW |
948 | |
949 | /* d_move screws up d_subdirs order */ | |
c6ffe100 | 950 | ceph_dir_clear_complete(new_dir); |
ea1409f9 | 951 | |
2817b000 | 952 | d_move(old_dentry, new_dentry); |
ea1409f9 SW |
953 | |
954 | /* ensure target dentry is invalidated, despite | |
955 | rehashing bug in vfs_rename_dir */ | |
81a6cf2d | 956 | ceph_invalidate_dentry_lease(new_dentry); |
2817b000 SW |
957 | } |
958 | ceph_mdsc_put_request(req); | |
959 | return err; | |
960 | } | |
961 | ||
81a6cf2d SW |
962 | /* |
963 | * Ensure a dentry lease will no longer revalidate. | |
964 | */ | |
965 | void ceph_invalidate_dentry_lease(struct dentry *dentry) | |
966 | { | |
967 | spin_lock(&dentry->d_lock); | |
968 | dentry->d_time = jiffies; | |
969 | ceph_dentry(dentry)->lease_shared_gen = 0; | |
970 | spin_unlock(&dentry->d_lock); | |
971 | } | |
2817b000 SW |
972 | |
973 | /* | |
974 | * Check if dentry lease is valid. If not, delete the lease. Try to | |
975 | * renew if the least is more than half up. | |
976 | */ | |
977 | static int dentry_lease_is_valid(struct dentry *dentry) | |
978 | { | |
979 | struct ceph_dentry_info *di; | |
980 | struct ceph_mds_session *s; | |
981 | int valid = 0; | |
982 | u32 gen; | |
983 | unsigned long ttl; | |
984 | struct ceph_mds_session *session = NULL; | |
985 | struct inode *dir = NULL; | |
986 | u32 seq = 0; | |
987 | ||
988 | spin_lock(&dentry->d_lock); | |
989 | di = ceph_dentry(dentry); | |
3d8eb7a9 | 990 | if (di->lease_session) { |
2817b000 | 991 | s = di->lease_session; |
d8fb02ab | 992 | spin_lock(&s->s_gen_ttl_lock); |
2817b000 SW |
993 | gen = s->s_cap_gen; |
994 | ttl = s->s_cap_ttl; | |
d8fb02ab | 995 | spin_unlock(&s->s_gen_ttl_lock); |
2817b000 SW |
996 | |
997 | if (di->lease_gen == gen && | |
998 | time_before(jiffies, dentry->d_time) && | |
999 | time_before(jiffies, ttl)) { | |
1000 | valid = 1; | |
1001 | if (di->lease_renew_after && | |
1002 | time_after(jiffies, di->lease_renew_after)) { | |
1003 | /* we should renew */ | |
1004 | dir = dentry->d_parent->d_inode; | |
1005 | session = ceph_get_mds_session(s); | |
1006 | seq = di->lease_seq; | |
1007 | di->lease_renew_after = 0; | |
1008 | di->lease_renew_from = jiffies; | |
1009 | } | |
2817b000 SW |
1010 | } |
1011 | } | |
1012 | spin_unlock(&dentry->d_lock); | |
1013 | ||
1014 | if (session) { | |
1015 | ceph_mdsc_lease_send_msg(session, dir, dentry, | |
1016 | CEPH_MDS_LEASE_RENEW, seq); | |
1017 | ceph_put_mds_session(session); | |
1018 | } | |
1019 | dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid); | |
1020 | return valid; | |
1021 | } | |
1022 | ||
1023 | /* | |
1024 | * Check if directory-wide content lease/cap is valid. | |
1025 | */ | |
1026 | static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry) | |
1027 | { | |
1028 | struct ceph_inode_info *ci = ceph_inode(dir); | |
1029 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
1030 | int valid = 0; | |
1031 | ||
be655596 | 1032 | spin_lock(&ci->i_ceph_lock); |
2817b000 SW |
1033 | if (ci->i_shared_gen == di->lease_shared_gen) |
1034 | valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1); | |
be655596 | 1035 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
1036 | dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n", |
1037 | dir, (unsigned)ci->i_shared_gen, dentry, | |
1038 | (unsigned)di->lease_shared_gen, valid); | |
1039 | return valid; | |
1040 | } | |
1041 | ||
1042 | /* | |
1043 | * Check if cached dentry can be trusted. | |
1044 | */ | |
0b728e19 | 1045 | static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags) |
2817b000 | 1046 | { |
bf1c6aca | 1047 | int valid = 0; |
34286d66 NP |
1048 | struct inode *dir; |
1049 | ||
0b728e19 | 1050 | if (flags & LOOKUP_RCU) |
34286d66 NP |
1051 | return -ECHILD; |
1052 | ||
1cd3935b SW |
1053 | dout("d_revalidate %p '%.*s' inode %p offset %lld\n", dentry, |
1054 | dentry->d_name.len, dentry->d_name.name, dentry->d_inode, | |
1055 | ceph_dentry(dentry)->offset); | |
2817b000 | 1056 | |
bf1c6aca SW |
1057 | dir = ceph_get_dentry_parent_inode(dentry); |
1058 | ||
2817b000 SW |
1059 | /* always trust cached snapped dentries, snapdir dentry */ |
1060 | if (ceph_snap(dir) != CEPH_NOSNAP) { | |
1061 | dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry, | |
1062 | dentry->d_name.len, dentry->d_name.name, dentry->d_inode); | |
bf1c6aca SW |
1063 | valid = 1; |
1064 | } else if (dentry->d_inode && | |
1065 | ceph_snap(dentry->d_inode) == CEPH_SNAPDIR) { | |
1066 | valid = 1; | |
1067 | } else if (dentry_lease_is_valid(dentry) || | |
1068 | dir_lease_is_valid(dir, dentry)) { | |
1069 | valid = 1; | |
2817b000 | 1070 | } |
2817b000 | 1071 | |
bf1c6aca SW |
1072 | dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid"); |
1073 | if (valid) | |
1074 | ceph_dentry_lru_touch(dentry); | |
1075 | else | |
1076 | d_drop(dentry); | |
1077 | iput(dir); | |
1078 | return valid; | |
2817b000 SW |
1079 | } |
1080 | ||
1081 | /* | |
147851d2 | 1082 | * Release our ceph_dentry_info. |
2817b000 | 1083 | */ |
147851d2 | 1084 | static void ceph_d_release(struct dentry *dentry) |
2817b000 SW |
1085 | { |
1086 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
2817b000 | 1087 | |
147851d2 | 1088 | dout("d_release %p\n", dentry); |
3d8eb7a9 SW |
1089 | ceph_dentry_lru_del(dentry); |
1090 | if (di->lease_session) | |
1091 | ceph_put_mds_session(di->lease_session); | |
1092 | kmem_cache_free(ceph_dentry_cachep, di); | |
1093 | dentry->d_fsdata = NULL; | |
2817b000 SW |
1094 | } |
1095 | ||
1096 | static int ceph_snapdir_d_revalidate(struct dentry *dentry, | |
0b728e19 | 1097 | unsigned int flags) |
2817b000 SW |
1098 | { |
1099 | /* | |
1100 | * Eventually, we'll want to revalidate snapped metadata | |
1101 | * too... probably... | |
1102 | */ | |
1103 | return 1; | |
1104 | } | |
1105 | ||
c6ffe100 SW |
1106 | /* |
1107 | * Set/clear/test dir complete flag on the dir's dentry. | |
1108 | */ | |
c6ffe100 SW |
1109 | void ceph_dir_set_complete(struct inode *inode) |
1110 | { | |
a40dc6cc SW |
1111 | struct dentry *dentry = d_find_any_alias(inode); |
1112 | ||
1113 | if (dentry && ceph_dentry(dentry) && | |
1114 | ceph_test_mount_opt(ceph_sb_to_client(dentry->d_sb), DCACHE)) { | |
1115 | dout(" marking %p (%p) complete\n", inode, dentry); | |
1116 | set_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags); | |
1117 | } | |
1118 | dput(dentry); | |
c6ffe100 SW |
1119 | } |
1120 | ||
1121 | void ceph_dir_clear_complete(struct inode *inode) | |
1122 | { | |
a40dc6cc SW |
1123 | struct dentry *dentry = d_find_any_alias(inode); |
1124 | ||
1125 | if (dentry && ceph_dentry(dentry)) { | |
1126 | dout(" marking %p (%p) complete\n", inode, dentry); | |
1127 | set_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags); | |
1128 | } | |
1129 | dput(dentry); | |
c6ffe100 SW |
1130 | } |
1131 | ||
1132 | bool ceph_dir_test_complete(struct inode *inode) | |
1133 | { | |
a40dc6cc SW |
1134 | struct dentry *dentry = d_find_any_alias(inode); |
1135 | ||
1136 | if (dentry && ceph_dentry(dentry)) { | |
1137 | dout(" marking %p (%p) NOT complete\n", inode, dentry); | |
1138 | clear_bit(CEPH_D_COMPLETE, &ceph_dentry(dentry)->flags); | |
1139 | } | |
1140 | dput(dentry); | |
c6ffe100 SW |
1141 | return false; |
1142 | } | |
1143 | ||
b58dc410 SW |
1144 | /* |
1145 | * When the VFS prunes a dentry from the cache, we need to clear the | |
1146 | * complete flag on the parent directory. | |
1147 | * | |
1148 | * Called under dentry->d_lock. | |
1149 | */ | |
1150 | static void ceph_d_prune(struct dentry *dentry) | |
1151 | { | |
1152 | struct ceph_dentry_info *di; | |
1153 | ||
774ac21d | 1154 | dout("ceph_d_prune %p\n", dentry); |
b58dc410 SW |
1155 | |
1156 | /* do we have a valid parent? */ | |
1157 | if (!dentry->d_parent || IS_ROOT(dentry)) | |
1158 | return; | |
1159 | ||
1160 | /* if we are not hashed, we don't affect D_COMPLETE */ | |
1161 | if (d_unhashed(dentry)) | |
1162 | return; | |
2817b000 | 1163 | |
b58dc410 SW |
1164 | /* |
1165 | * we hold d_lock, so d_parent is stable, and d_fsdata is never | |
1166 | * cleared until d_release | |
1167 | */ | |
1168 | di = ceph_dentry(dentry->d_parent); | |
1169 | clear_bit(CEPH_D_COMPLETE, &di->flags); | |
1170 | } | |
2817b000 SW |
1171 | |
1172 | /* | |
1173 | * read() on a dir. This weird interface hack only works if mounted | |
1174 | * with '-o dirstat'. | |
1175 | */ | |
1176 | static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, | |
1177 | loff_t *ppos) | |
1178 | { | |
1179 | struct ceph_file_info *cf = file->private_data; | |
1180 | struct inode *inode = file->f_dentry->d_inode; | |
1181 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1182 | int left; | |
ae598083 | 1183 | const int bufsize = 1024; |
2817b000 | 1184 | |
3d14c5d2 | 1185 | if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT)) |
2817b000 SW |
1186 | return -EISDIR; |
1187 | ||
1188 | if (!cf->dir_info) { | |
ae598083 | 1189 | cf->dir_info = kmalloc(bufsize, GFP_NOFS); |
2817b000 SW |
1190 | if (!cf->dir_info) |
1191 | return -ENOMEM; | |
1192 | cf->dir_info_len = | |
ae598083 | 1193 | snprintf(cf->dir_info, bufsize, |
2817b000 SW |
1194 | "entries: %20lld\n" |
1195 | " files: %20lld\n" | |
1196 | " subdirs: %20lld\n" | |
1197 | "rentries: %20lld\n" | |
1198 | " rfiles: %20lld\n" | |
1199 | " rsubdirs: %20lld\n" | |
1200 | "rbytes: %20lld\n" | |
1201 | "rctime: %10ld.%09ld\n", | |
1202 | ci->i_files + ci->i_subdirs, | |
1203 | ci->i_files, | |
1204 | ci->i_subdirs, | |
1205 | ci->i_rfiles + ci->i_rsubdirs, | |
1206 | ci->i_rfiles, | |
1207 | ci->i_rsubdirs, | |
1208 | ci->i_rbytes, | |
1209 | (long)ci->i_rctime.tv_sec, | |
1210 | (long)ci->i_rctime.tv_nsec); | |
1211 | } | |
1212 | ||
1213 | if (*ppos >= cf->dir_info_len) | |
1214 | return 0; | |
1215 | size = min_t(unsigned, size, cf->dir_info_len-*ppos); | |
1216 | left = copy_to_user(buf, cf->dir_info + *ppos, size); | |
1217 | if (left == size) | |
1218 | return -EFAULT; | |
1219 | *ppos += (size - left); | |
1220 | return size - left; | |
1221 | } | |
1222 | ||
1223 | /* | |
1224 | * an fsync() on a dir will wait for any uncommitted directory | |
1225 | * operations to commit. | |
1226 | */ | |
02c24a82 JB |
1227 | static int ceph_dir_fsync(struct file *file, loff_t start, loff_t end, |
1228 | int datasync) | |
2817b000 | 1229 | { |
7ea80859 | 1230 | struct inode *inode = file->f_path.dentry->d_inode; |
2817b000 SW |
1231 | struct ceph_inode_info *ci = ceph_inode(inode); |
1232 | struct list_head *head = &ci->i_unsafe_dirops; | |
1233 | struct ceph_mds_request *req; | |
1234 | u64 last_tid; | |
1235 | int ret = 0; | |
1236 | ||
1237 | dout("dir_fsync %p\n", inode); | |
02c24a82 JB |
1238 | ret = filemap_write_and_wait_range(inode->i_mapping, start, end); |
1239 | if (ret) | |
1240 | return ret; | |
1241 | mutex_lock(&inode->i_mutex); | |
1242 | ||
2817b000 SW |
1243 | spin_lock(&ci->i_unsafe_lock); |
1244 | if (list_empty(head)) | |
1245 | goto out; | |
1246 | ||
1247 | req = list_entry(head->prev, | |
1248 | struct ceph_mds_request, r_unsafe_dir_item); | |
1249 | last_tid = req->r_tid; | |
1250 | ||
1251 | do { | |
1252 | ceph_mdsc_get_request(req); | |
1253 | spin_unlock(&ci->i_unsafe_lock); | |
2ff179e6 | 1254 | |
2817b000 SW |
1255 | dout("dir_fsync %p wait on tid %llu (until %llu)\n", |
1256 | inode, req->r_tid, last_tid); | |
1257 | if (req->r_timeout) { | |
1258 | ret = wait_for_completion_timeout( | |
1259 | &req->r_safe_completion, req->r_timeout); | |
1260 | if (ret > 0) | |
1261 | ret = 0; | |
1262 | else if (ret == 0) | |
1263 | ret = -EIO; /* timed out */ | |
1264 | } else { | |
1265 | wait_for_completion(&req->r_safe_completion); | |
1266 | } | |
2817b000 SW |
1267 | ceph_mdsc_put_request(req); |
1268 | ||
2ff179e6 | 1269 | spin_lock(&ci->i_unsafe_lock); |
2817b000 SW |
1270 | if (ret || list_empty(head)) |
1271 | break; | |
1272 | req = list_entry(head->next, | |
1273 | struct ceph_mds_request, r_unsafe_dir_item); | |
1274 | } while (req->r_tid < last_tid); | |
1275 | out: | |
1276 | spin_unlock(&ci->i_unsafe_lock); | |
02c24a82 JB |
1277 | mutex_unlock(&inode->i_mutex); |
1278 | ||
2817b000 SW |
1279 | return ret; |
1280 | } | |
1281 | ||
1282 | /* | |
1283 | * We maintain a private dentry LRU. | |
1284 | * | |
1285 | * FIXME: this needs to be changed to a per-mds lru to be useful. | |
1286 | */ | |
1287 | void ceph_dentry_lru_add(struct dentry *dn) | |
1288 | { | |
1289 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1290 | struct ceph_mds_client *mdsc; | |
2817b000 | 1291 | |
04a419f9 SW |
1292 | dout("dentry_lru_add %p %p '%.*s'\n", di, dn, |
1293 | dn->d_name.len, dn->d_name.name); | |
3d8eb7a9 SW |
1294 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
1295 | spin_lock(&mdsc->dentry_lru_lock); | |
1296 | list_add_tail(&di->lru, &mdsc->dentry_lru); | |
1297 | mdsc->num_dentry++; | |
1298 | spin_unlock(&mdsc->dentry_lru_lock); | |
2817b000 SW |
1299 | } |
1300 | ||
1301 | void ceph_dentry_lru_touch(struct dentry *dn) | |
1302 | { | |
1303 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1304 | struct ceph_mds_client *mdsc; | |
2817b000 | 1305 | |
1cd3935b SW |
1306 | dout("dentry_lru_touch %p %p '%.*s' (offset %lld)\n", di, dn, |
1307 | dn->d_name.len, dn->d_name.name, di->offset); | |
3d8eb7a9 SW |
1308 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
1309 | spin_lock(&mdsc->dentry_lru_lock); | |
1310 | list_move_tail(&di->lru, &mdsc->dentry_lru); | |
1311 | spin_unlock(&mdsc->dentry_lru_lock); | |
2817b000 SW |
1312 | } |
1313 | ||
1314 | void ceph_dentry_lru_del(struct dentry *dn) | |
1315 | { | |
1316 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1317 | struct ceph_mds_client *mdsc; | |
1318 | ||
04a419f9 SW |
1319 | dout("dentry_lru_del %p %p '%.*s'\n", di, dn, |
1320 | dn->d_name.len, dn->d_name.name); | |
3d8eb7a9 SW |
1321 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
1322 | spin_lock(&mdsc->dentry_lru_lock); | |
1323 | list_del_init(&di->lru); | |
1324 | mdsc->num_dentry--; | |
1325 | spin_unlock(&mdsc->dentry_lru_lock); | |
2817b000 SW |
1326 | } |
1327 | ||
6c0f3af7 SW |
1328 | /* |
1329 | * Return name hash for a given dentry. This is dependent on | |
1330 | * the parent directory's hash function. | |
1331 | */ | |
e5f86dc3 | 1332 | unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn) |
6c0f3af7 | 1333 | { |
6c0f3af7 SW |
1334 | struct ceph_inode_info *dci = ceph_inode(dir); |
1335 | ||
1336 | switch (dci->i_dir_layout.dl_dir_hash) { | |
1337 | case 0: /* for backward compat */ | |
1338 | case CEPH_STR_HASH_LINUX: | |
1339 | return dn->d_name.hash; | |
1340 | ||
1341 | default: | |
1342 | return ceph_str_hash(dci->i_dir_layout.dl_dir_hash, | |
1343 | dn->d_name.name, dn->d_name.len); | |
1344 | } | |
1345 | } | |
1346 | ||
2817b000 SW |
1347 | const struct file_operations ceph_dir_fops = { |
1348 | .read = ceph_read_dir, | |
1349 | .readdir = ceph_readdir, | |
1350 | .llseek = ceph_dir_llseek, | |
1351 | .open = ceph_open, | |
1352 | .release = ceph_release, | |
1353 | .unlocked_ioctl = ceph_ioctl, | |
1354 | .fsync = ceph_dir_fsync, | |
1355 | }; | |
1356 | ||
1357 | const struct inode_operations ceph_dir_iops = { | |
1358 | .lookup = ceph_lookup, | |
1359 | .permission = ceph_permission, | |
1360 | .getattr = ceph_getattr, | |
1361 | .setattr = ceph_setattr, | |
1362 | .setxattr = ceph_setxattr, | |
1363 | .getxattr = ceph_getxattr, | |
1364 | .listxattr = ceph_listxattr, | |
1365 | .removexattr = ceph_removexattr, | |
1366 | .mknod = ceph_mknod, | |
1367 | .symlink = ceph_symlink, | |
1368 | .mkdir = ceph_mkdir, | |
1369 | .link = ceph_link, | |
1370 | .unlink = ceph_unlink, | |
1371 | .rmdir = ceph_unlink, | |
1372 | .rename = ceph_rename, | |
1373 | .create = ceph_create, | |
2d83bde9 | 1374 | .atomic_open = ceph_atomic_open, |
2817b000 SW |
1375 | }; |
1376 | ||
52dfb8ac | 1377 | const struct dentry_operations ceph_dentry_ops = { |
2817b000 | 1378 | .d_revalidate = ceph_d_revalidate, |
147851d2 | 1379 | .d_release = ceph_d_release, |
b58dc410 | 1380 | .d_prune = ceph_d_prune, |
2817b000 SW |
1381 | }; |
1382 | ||
52dfb8ac | 1383 | const struct dentry_operations ceph_snapdir_dentry_ops = { |
2817b000 | 1384 | .d_revalidate = ceph_snapdir_d_revalidate, |
147851d2 | 1385 | .d_release = ceph_d_release, |
2817b000 SW |
1386 | }; |
1387 | ||
52dfb8ac | 1388 | const struct dentry_operations ceph_snap_dentry_ops = { |
147851d2 | 1389 | .d_release = ceph_d_release, |
b58dc410 | 1390 | .d_prune = ceph_d_prune, |
2817b000 | 1391 | }; |