]>
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 | 53 | |
8842b3be | 54 | if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) |
48d0cbd1 SW |
55 | d_set_d_op(dentry, &ceph_dentry_ops); |
56 | else if (ceph_snap(dentry->d_parent->d_inode) == CEPH_SNAPDIR) | |
57 | d_set_d_op(dentry, &ceph_snapdir_dentry_ops); | |
58 | else | |
59 | d_set_d_op(dentry, &ceph_snap_dentry_ops); | |
60 | ||
2817b000 SW |
61 | di->dentry = dentry; |
62 | di->lease_session = NULL; | |
2817b000 | 63 | dentry->d_time = jiffies; |
48d0cbd1 SW |
64 | /* avoid reordering d_fsdata setup so that the check above is safe */ |
65 | smp_mb(); | |
66 | dentry->d_fsdata = di; | |
2817b000 SW |
67 | ceph_dentry_lru_add(dentry); |
68 | out_unlock: | |
69 | spin_unlock(&dentry->d_lock); | |
70 | return 0; | |
71 | } | |
72 | ||
5f21c96d SW |
73 | struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry) |
74 | { | |
75 | struct inode *inode = NULL; | |
76 | ||
77 | if (!dentry) | |
78 | return NULL; | |
79 | ||
80 | spin_lock(&dentry->d_lock); | |
8842b3be | 81 | if (!IS_ROOT(dentry)) { |
5f21c96d SW |
82 | inode = dentry->d_parent->d_inode; |
83 | ihold(inode); | |
84 | } | |
85 | spin_unlock(&dentry->d_lock); | |
86 | return inode; | |
87 | } | |
2817b000 SW |
88 | |
89 | ||
90 | /* | |
91 | * for readdir, we encode the directory frag and offset within that | |
92 | * frag into f_pos. | |
93 | */ | |
94 | static unsigned fpos_frag(loff_t p) | |
95 | { | |
96 | return p >> 32; | |
97 | } | |
98 | static unsigned fpos_off(loff_t p) | |
99 | { | |
100 | return p & 0xffffffff; | |
101 | } | |
102 | ||
103 | /* | |
104 | * When possible, we try to satisfy a readdir by peeking at the | |
105 | * dcache. We make this work by carefully ordering dentries on | |
106 | * d_u.d_child when we initially get results back from the MDS, and | |
107 | * falling back to a "normal" sync readdir if any dentries in the dir | |
108 | * are dropped. | |
109 | * | |
2f276c51 | 110 | * Complete dir indicates that we have all dentries in the dir. It is |
2817b000 SW |
111 | * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by |
112 | * the MDS if/when the directory is modified). | |
113 | */ | |
114 | static int __dcache_readdir(struct file *filp, | |
115 | void *dirent, filldir_t filldir) | |
116 | { | |
2817b000 SW |
117 | struct ceph_file_info *fi = filp->private_data; |
118 | struct dentry *parent = filp->f_dentry; | |
119 | struct inode *dir = parent->d_inode; | |
120 | struct list_head *p; | |
121 | struct dentry *dentry, *last; | |
122 | struct ceph_dentry_info *di; | |
123 | int err = 0; | |
124 | ||
125 | /* claim ref on last dentry we returned */ | |
126 | last = fi->dentry; | |
127 | fi->dentry = NULL; | |
128 | ||
129 | dout("__dcache_readdir %p at %llu (last %p)\n", dir, filp->f_pos, | |
130 | last); | |
131 | ||
2fd6b7f5 | 132 | spin_lock(&parent->d_lock); |
2817b000 SW |
133 | |
134 | /* start at beginning? */ | |
884ea892 SW |
135 | if (filp->f_pos == 2 || last == NULL || |
136 | filp->f_pos < ceph_dentry(last)->offset) { | |
2817b000 SW |
137 | if (list_empty(&parent->d_subdirs)) |
138 | goto out_unlock; | |
139 | p = parent->d_subdirs.prev; | |
140 | dout(" initial p %p/%p\n", p->prev, p->next); | |
141 | } else { | |
142 | p = last->d_u.d_child.prev; | |
143 | } | |
144 | ||
145 | more: | |
146 | dentry = list_entry(p, struct dentry, d_u.d_child); | |
147 | di = ceph_dentry(dentry); | |
148 | while (1) { | |
1cd3935b SW |
149 | dout(" p %p/%p %s d_subdirs %p/%p\n", p->prev, p->next, |
150 | d_unhashed(dentry) ? "!hashed" : "hashed", | |
2817b000 SW |
151 | parent->d_subdirs.prev, parent->d_subdirs.next); |
152 | if (p == &parent->d_subdirs) { | |
9cfa1098 | 153 | fi->flags |= CEPH_F_ATEND; |
2817b000 SW |
154 | goto out_unlock; |
155 | } | |
2fd6b7f5 | 156 | spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED); |
2817b000 | 157 | if (!d_unhashed(dentry) && dentry->d_inode && |
09b8a7d2 | 158 | ceph_snap(dentry->d_inode) != CEPH_SNAPDIR && |
1d1de916 | 159 | ceph_ino(dentry->d_inode) != CEPH_INO_CEPH && |
2817b000 SW |
160 | filp->f_pos <= di->offset) |
161 | break; | |
162 | dout(" skipping %p %.*s at %llu (%llu)%s%s\n", dentry, | |
163 | dentry->d_name.len, dentry->d_name.name, di->offset, | |
164 | filp->f_pos, d_unhashed(dentry) ? " unhashed" : "", | |
165 | !dentry->d_inode ? " null" : ""); | |
da502956 | 166 | spin_unlock(&dentry->d_lock); |
2817b000 SW |
167 | p = p->prev; |
168 | dentry = list_entry(p, struct dentry, d_u.d_child); | |
169 | di = ceph_dentry(dentry); | |
170 | } | |
171 | ||
da502956 | 172 | dget_dlock(dentry); |
b7ab39f6 | 173 | spin_unlock(&dentry->d_lock); |
2fd6b7f5 | 174 | spin_unlock(&parent->d_lock); |
2817b000 SW |
175 | |
176 | dout(" %llu (%llu) dentry %p %.*s %p\n", di->offset, filp->f_pos, | |
177 | dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode); | |
178 | filp->f_pos = di->offset; | |
179 | err = filldir(dirent, dentry->d_name.name, | |
180 | dentry->d_name.len, di->offset, | |
ad1fee96 | 181 | ceph_translate_ino(dentry->d_sb, dentry->d_inode->i_ino), |
2817b000 SW |
182 | dentry->d_inode->i_mode >> 12); |
183 | ||
184 | if (last) { | |
185 | if (err < 0) { | |
186 | /* remember our position */ | |
187 | fi->dentry = last; | |
188 | fi->next_offset = di->offset; | |
189 | } else { | |
190 | dput(last); | |
191 | } | |
2817b000 | 192 | } |
f5b06628 SW |
193 | last = dentry; |
194 | ||
2817b000 | 195 | if (err < 0) |
efa4c120 | 196 | goto out; |
2817b000 | 197 | |
2817b000 SW |
198 | filp->f_pos++; |
199 | ||
b5c84bf6 | 200 | /* make sure a dentry wasn't dropped while we didn't have parent lock */ |
2f276c51 YZ |
201 | if (!ceph_dir_is_complete(dir)) { |
202 | dout(" lost dir complete on %p; falling back to mds\n", dir); | |
efa4c120 SW |
203 | err = -EAGAIN; |
204 | goto out; | |
205 | } | |
206 | ||
2fd6b7f5 | 207 | spin_lock(&parent->d_lock); |
efa4c120 SW |
208 | p = p->prev; /* advance to next dentry */ |
209 | goto more; | |
2817b000 SW |
210 | |
211 | out_unlock: | |
2fd6b7f5 | 212 | spin_unlock(&parent->d_lock); |
efa4c120 SW |
213 | out: |
214 | if (last) | |
2817b000 | 215 | dput(last); |
2817b000 SW |
216 | return err; |
217 | } | |
218 | ||
219 | /* | |
220 | * make note of the last dentry we read, so we can | |
221 | * continue at the same lexicographical point, | |
222 | * regardless of what dir changes take place on the | |
223 | * server. | |
224 | */ | |
225 | static int note_last_dentry(struct ceph_file_info *fi, const char *name, | |
226 | int len) | |
227 | { | |
228 | kfree(fi->last_name); | |
229 | fi->last_name = kmalloc(len+1, GFP_NOFS); | |
230 | if (!fi->last_name) | |
231 | return -ENOMEM; | |
232 | memcpy(fi->last_name, name, len); | |
233 | fi->last_name[len] = 0; | |
234 | dout("note_last_dentry '%s'\n", fi->last_name); | |
235 | return 0; | |
236 | } | |
237 | ||
238 | static int ceph_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
239 | { | |
240 | struct ceph_file_info *fi = filp->private_data; | |
496ad9aa | 241 | struct inode *inode = file_inode(filp); |
2817b000 | 242 | struct ceph_inode_info *ci = ceph_inode(inode); |
3d14c5d2 YS |
243 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
244 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
245 | unsigned frag = fpos_frag(filp->f_pos); |
246 | int off = fpos_off(filp->f_pos); | |
247 | int err; | |
248 | u32 ftype; | |
249 | struct ceph_mds_reply_info_parsed *rinfo; | |
3d14c5d2 YS |
250 | const int max_entries = fsc->mount_options->max_readdir; |
251 | const int max_bytes = fsc->mount_options->max_readdir_bytes; | |
2817b000 SW |
252 | |
253 | dout("readdir %p filp %p frag %u off %u\n", inode, filp, frag, off); | |
9cfa1098 | 254 | if (fi->flags & CEPH_F_ATEND) |
2817b000 SW |
255 | return 0; |
256 | ||
257 | /* always start with . and .. */ | |
258 | if (filp->f_pos == 0) { | |
259 | /* note dir version at start of readdir so we can tell | |
260 | * if any dentries get dropped */ | |
2f276c51 | 261 | fi->dir_release_count = atomic_read(&ci->i_release_count); |
2817b000 SW |
262 | |
263 | dout("readdir off 0 -> '.'\n"); | |
264 | if (filldir(dirent, ".", 1, ceph_make_fpos(0, 0), | |
ad1fee96 YS |
265 | ceph_translate_ino(inode->i_sb, inode->i_ino), |
266 | inode->i_mode >> 12) < 0) | |
2817b000 SW |
267 | return 0; |
268 | filp->f_pos = 1; | |
269 | off = 1; | |
270 | } | |
271 | if (filp->f_pos == 1) { | |
b85fd6bd | 272 | ino_t ino = parent_ino(filp->f_dentry); |
2817b000 SW |
273 | dout("readdir off 1 -> '..'\n"); |
274 | if (filldir(dirent, "..", 2, ceph_make_fpos(0, 1), | |
ad1fee96 | 275 | ceph_translate_ino(inode->i_sb, ino), |
2817b000 SW |
276 | inode->i_mode >> 12) < 0) |
277 | return 0; | |
278 | filp->f_pos = 2; | |
279 | off = 2; | |
280 | } | |
281 | ||
282 | /* can we use the dcache? */ | |
be655596 | 283 | spin_lock(&ci->i_ceph_lock); |
2817b000 | 284 | if ((filp->f_pos == 2 || fi->dentry) && |
3d14c5d2 | 285 | !ceph_test_mount_opt(fsc, NOASYNCREADDIR) && |
a0dff78d | 286 | ceph_snap(inode) != CEPH_SNAPDIR && |
2f276c51 | 287 | __ceph_dir_is_complete(ci) && |
2817b000 | 288 | __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) { |
be655596 | 289 | spin_unlock(&ci->i_ceph_lock); |
2817b000 | 290 | err = __dcache_readdir(filp, dirent, filldir); |
efa4c120 | 291 | if (err != -EAGAIN) |
2817b000 | 292 | return err; |
efa4c120 | 293 | } else { |
be655596 | 294 | spin_unlock(&ci->i_ceph_lock); |
2817b000 | 295 | } |
2817b000 SW |
296 | if (fi->dentry) { |
297 | err = note_last_dentry(fi, fi->dentry->d_name.name, | |
298 | fi->dentry->d_name.len); | |
299 | if (err) | |
300 | return err; | |
301 | dput(fi->dentry); | |
302 | fi->dentry = NULL; | |
303 | } | |
304 | ||
305 | /* proceed with a normal readdir */ | |
306 | ||
307 | more: | |
308 | /* do we have the correct frag content buffered? */ | |
309 | if (fi->frag != frag || fi->last_readdir == NULL) { | |
310 | struct ceph_mds_request *req; | |
311 | int op = ceph_snap(inode) == CEPH_SNAPDIR ? | |
312 | CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR; | |
313 | ||
314 | /* discard old result, if any */ | |
393f6620 | 315 | if (fi->last_readdir) { |
2817b000 | 316 | ceph_mdsc_put_request(fi->last_readdir); |
393f6620 SW |
317 | fi->last_readdir = NULL; |
318 | } | |
2817b000 SW |
319 | |
320 | /* requery frag tree, as the frag topology may have changed */ | |
321 | frag = ceph_choose_frag(ceph_inode(inode), frag, NULL, NULL); | |
322 | ||
323 | dout("readdir fetching %llx.%llx frag %x offset '%s'\n", | |
324 | ceph_vinop(inode), frag, fi->last_name); | |
325 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
326 | if (IS_ERR(req)) | |
327 | return PTR_ERR(req); | |
70b666c3 SW |
328 | req->r_inode = inode; |
329 | ihold(inode); | |
2817b000 SW |
330 | req->r_dentry = dget(filp->f_dentry); |
331 | /* hints to request -> mds selection code */ | |
332 | req->r_direct_mode = USE_AUTH_MDS; | |
333 | req->r_direct_hash = ceph_frag_value(frag); | |
334 | req->r_direct_is_hash = true; | |
335 | req->r_path2 = kstrdup(fi->last_name, GFP_NOFS); | |
336 | req->r_readdir_offset = fi->next_offset; | |
337 | req->r_args.readdir.frag = cpu_to_le32(frag); | |
338 | req->r_args.readdir.max_entries = cpu_to_le32(max_entries); | |
23804d91 | 339 | req->r_args.readdir.max_bytes = cpu_to_le32(max_bytes); |
e1e4dd0c | 340 | req->r_num_caps = max_entries + 1; |
2817b000 SW |
341 | err = ceph_mdsc_do_request(mdsc, NULL, req); |
342 | if (err < 0) { | |
343 | ceph_mdsc_put_request(req); | |
344 | return err; | |
345 | } | |
346 | dout("readdir got and parsed readdir result=%d" | |
347 | " on frag %x, end=%d, complete=%d\n", err, frag, | |
348 | (int)req->r_reply_info.dir_end, | |
349 | (int)req->r_reply_info.dir_complete); | |
350 | ||
351 | if (!req->r_did_prepopulate) { | |
352 | dout("readdir !did_prepopulate"); | |
2f276c51 YZ |
353 | /* preclude from marking dir complete */ |
354 | fi->dir_release_count--; | |
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); |
2f276c51 | 432 | if (atomic_read(&ci->i_release_count) == fi->dir_release_count) { |
a8673d61 | 433 | dout(" marking %p complete\n", inode); |
2f276c51 | 434 | __ceph_dir_set_complete(ci, fi->dir_release_count); |
2817b000 SW |
435 | ci->i_max_offset = filp->f_pos; |
436 | } | |
be655596 | 437 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
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 | ||
965c8e59 | 459 | static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence) |
2817b000 SW |
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; |
965c8e59 | 468 | switch (whence) { |
2817b000 SW |
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, | |
00cd8dd3 | 580 | unsigned int flags) |
2817b000 | 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 | ||
2817b000 SW |
598 | /* can we conclude ENOENT locally? */ |
599 | if (dentry->d_inode == NULL) { | |
600 | struct ceph_inode_info *ci = ceph_inode(dir); | |
601 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
602 | ||
be655596 | 603 | spin_lock(&ci->i_ceph_lock); |
2817b000 SW |
604 | dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags); |
605 | if (strncmp(dentry->d_name.name, | |
3d14c5d2 | 606 | fsc->mount_options->snapdir_name, |
2817b000 | 607 | dentry->d_name.len) && |
1d1de916 | 608 | !is_root_ceph_dentry(dir, dentry) && |
2f276c51 | 609 | __ceph_dir_is_complete(ci) && |
2817b000 | 610 | (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) { |
be655596 | 611 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
612 | dout(" dir %p complete, -ENOENT\n", dir); |
613 | d_add(dentry, NULL); | |
614 | di->lease_shared_gen = ci->i_shared_gen; | |
615 | return NULL; | |
616 | } | |
be655596 | 617 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
618 | } |
619 | ||
620 | op = ceph_snap(dir) == CEPH_SNAPDIR ? | |
621 | CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; | |
622 | req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); | |
623 | if (IS_ERR(req)) | |
7e34bc52 | 624 | return ERR_CAST(req); |
2817b000 SW |
625 | req->r_dentry = dget(dentry); |
626 | req->r_num_caps = 2; | |
627 | /* we only need inode linkage */ | |
628 | req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); | |
629 | req->r_locked_dir = dir; | |
630 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
468640e3 | 631 | err = ceph_handle_snapdir(req, dentry, err); |
2817b000 SW |
632 | dentry = ceph_finish_lookup(req, dentry, err); |
633 | ceph_mdsc_put_request(req); /* will dput(dentry) */ | |
634 | dout("lookup result=%p\n", dentry); | |
635 | return dentry; | |
636 | } | |
637 | ||
638 | /* | |
639 | * If we do a create but get no trace back from the MDS, follow up with | |
640 | * a lookup (the VFS expects us to link up the provided dentry). | |
641 | */ | |
642 | int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry) | |
643 | { | |
00cd8dd3 | 644 | struct dentry *result = ceph_lookup(dir, dentry, 0); |
2817b000 SW |
645 | |
646 | if (result && !IS_ERR(result)) { | |
647 | /* | |
648 | * We created the item, then did a lookup, and found | |
649 | * it was already linked to another inode we already | |
650 | * had in our cache (and thus got spliced). Link our | |
651 | * dentry to that inode, but don't hash it, just in | |
652 | * case the VFS wants to dereference it. | |
653 | */ | |
654 | BUG_ON(!result->d_inode); | |
655 | d_instantiate(dentry, result->d_inode); | |
656 | return 0; | |
657 | } | |
658 | return PTR_ERR(result); | |
659 | } | |
660 | ||
661 | static int ceph_mknod(struct inode *dir, struct dentry *dentry, | |
1a67aafb | 662 | umode_t mode, dev_t rdev) |
2817b000 | 663 | { |
3d14c5d2 YS |
664 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
665 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
666 | struct ceph_mds_request *req; |
667 | int err; | |
668 | ||
669 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
670 | return -EROFS; | |
671 | ||
1a67aafb | 672 | dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n", |
2817b000 SW |
673 | dir, dentry, mode, rdev); |
674 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS); | |
675 | if (IS_ERR(req)) { | |
676 | d_drop(dentry); | |
677 | return PTR_ERR(req); | |
678 | } | |
679 | req->r_dentry = dget(dentry); | |
680 | req->r_num_caps = 2; | |
681 | req->r_locked_dir = dir; | |
682 | req->r_args.mknod.mode = cpu_to_le32(mode); | |
683 | req->r_args.mknod.rdev = cpu_to_le32(rdev); | |
684 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
685 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
686 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
687 | if (!err && !req->r_reply_info.head->is_dentry) | |
688 | err = ceph_handle_notrace_create(dir, dentry); | |
689 | ceph_mdsc_put_request(req); | |
690 | if (err) | |
691 | d_drop(dentry); | |
692 | return err; | |
693 | } | |
694 | ||
4acdaf27 | 695 | static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 696 | bool excl) |
2817b000 | 697 | { |
2d83bde9 | 698 | return ceph_mknod(dir, dentry, mode, 0); |
2817b000 SW |
699 | } |
700 | ||
701 | static int ceph_symlink(struct inode *dir, struct dentry *dentry, | |
702 | const char *dest) | |
703 | { | |
3d14c5d2 YS |
704 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
705 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
706 | struct ceph_mds_request *req; |
707 | int err; | |
708 | ||
709 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
710 | return -EROFS; | |
711 | ||
712 | dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest); | |
713 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS); | |
714 | if (IS_ERR(req)) { | |
715 | d_drop(dentry); | |
716 | return PTR_ERR(req); | |
717 | } | |
718 | req->r_dentry = dget(dentry); | |
719 | req->r_num_caps = 2; | |
720 | req->r_path2 = kstrdup(dest, GFP_NOFS); | |
721 | req->r_locked_dir = dir; | |
722 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
723 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
724 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
725 | if (!err && !req->r_reply_info.head->is_dentry) | |
726 | err = ceph_handle_notrace_create(dir, dentry); | |
727 | ceph_mdsc_put_request(req); | |
728 | if (err) | |
729 | d_drop(dentry); | |
730 | return err; | |
731 | } | |
732 | ||
18bb1db3 | 733 | static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
2817b000 | 734 | { |
3d14c5d2 YS |
735 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
736 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
737 | struct ceph_mds_request *req; |
738 | int err = -EROFS; | |
739 | int op; | |
740 | ||
741 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
742 | /* mkdir .snap/foo is a MKSNAP */ | |
743 | op = CEPH_MDS_OP_MKSNAP; | |
744 | dout("mksnap dir %p snap '%.*s' dn %p\n", dir, | |
745 | dentry->d_name.len, dentry->d_name.name, dentry); | |
746 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { | |
18bb1db3 | 747 | dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode); |
2817b000 SW |
748 | op = CEPH_MDS_OP_MKDIR; |
749 | } else { | |
750 | goto out; | |
751 | } | |
752 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
753 | if (IS_ERR(req)) { | |
754 | err = PTR_ERR(req); | |
755 | goto out; | |
756 | } | |
757 | ||
758 | req->r_dentry = dget(dentry); | |
759 | req->r_num_caps = 2; | |
760 | req->r_locked_dir = dir; | |
761 | req->r_args.mkdir.mode = cpu_to_le32(mode); | |
762 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
763 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
764 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
765 | if (!err && !req->r_reply_info.head->is_dentry) | |
766 | err = ceph_handle_notrace_create(dir, dentry); | |
767 | ceph_mdsc_put_request(req); | |
768 | out: | |
769 | if (err < 0) | |
770 | d_drop(dentry); | |
771 | return err; | |
772 | } | |
773 | ||
774 | static int ceph_link(struct dentry *old_dentry, struct inode *dir, | |
775 | struct dentry *dentry) | |
776 | { | |
3d14c5d2 YS |
777 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
778 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
779 | struct ceph_mds_request *req; |
780 | int err; | |
781 | ||
782 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
783 | return -EROFS; | |
784 | ||
785 | dout("link in dir %p old_dentry %p dentry %p\n", dir, | |
786 | old_dentry, dentry); | |
787 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS); | |
788 | if (IS_ERR(req)) { | |
789 | d_drop(dentry); | |
790 | return PTR_ERR(req); | |
791 | } | |
792 | req->r_dentry = dget(dentry); | |
793 | req->r_num_caps = 2; | |
794 | req->r_old_dentry = dget(old_dentry); /* or inode? hrm. */ | |
41b02e1f | 795 | req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry); |
2817b000 SW |
796 | req->r_locked_dir = dir; |
797 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
798 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
799 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
70b666c3 | 800 | if (err) { |
2817b000 | 801 | d_drop(dentry); |
70b666c3 SW |
802 | } else if (!req->r_reply_info.head->is_dentry) { |
803 | ihold(old_dentry->d_inode); | |
804 | d_instantiate(dentry, old_dentry->d_inode); | |
805 | } | |
2817b000 SW |
806 | ceph_mdsc_put_request(req); |
807 | return err; | |
808 | } | |
809 | ||
810 | /* | |
811 | * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it | |
812 | * looks like the link count will hit 0, drop any other caps (other | |
813 | * than PIN) we don't specifically want (due to the file still being | |
814 | * open). | |
815 | */ | |
816 | static int drop_caps_for_unlink(struct inode *inode) | |
817 | { | |
818 | struct ceph_inode_info *ci = ceph_inode(inode); | |
819 | int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; | |
820 | ||
be655596 | 821 | spin_lock(&ci->i_ceph_lock); |
2817b000 SW |
822 | if (inode->i_nlink == 1) { |
823 | drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN); | |
824 | ci->i_ceph_flags |= CEPH_I_NODELAY; | |
825 | } | |
be655596 | 826 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
827 | return drop; |
828 | } | |
829 | ||
830 | /* | |
831 | * rmdir and unlink are differ only by the metadata op code | |
832 | */ | |
833 | static int ceph_unlink(struct inode *dir, struct dentry *dentry) | |
834 | { | |
3d14c5d2 YS |
835 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
836 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
837 | struct inode *inode = dentry->d_inode; |
838 | struct ceph_mds_request *req; | |
839 | int err = -EROFS; | |
840 | int op; | |
841 | ||
842 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
843 | /* rmdir .snap/foo is RMSNAP */ | |
844 | dout("rmsnap dir %p '%.*s' dn %p\n", dir, dentry->d_name.len, | |
845 | dentry->d_name.name, dentry); | |
846 | op = CEPH_MDS_OP_RMSNAP; | |
847 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { | |
848 | dout("unlink/rmdir dir %p dn %p inode %p\n", | |
849 | dir, dentry, inode); | |
dba19c60 | 850 | op = S_ISDIR(dentry->d_inode->i_mode) ? |
2817b000 SW |
851 | CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK; |
852 | } else | |
853 | goto out; | |
854 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
855 | if (IS_ERR(req)) { | |
856 | err = PTR_ERR(req); | |
857 | goto out; | |
858 | } | |
859 | req->r_dentry = dget(dentry); | |
860 | req->r_num_caps = 2; | |
861 | req->r_locked_dir = dir; | |
862 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
863 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
864 | req->r_inode_drop = drop_caps_for_unlink(inode); | |
865 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
866 | if (!err && !req->r_reply_info.head->is_dentry) | |
867 | d_delete(dentry); | |
868 | ceph_mdsc_put_request(req); | |
869 | out: | |
870 | return err; | |
871 | } | |
872 | ||
873 | static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry, | |
874 | struct inode *new_dir, struct dentry *new_dentry) | |
875 | { | |
3d14c5d2 YS |
876 | struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb); |
877 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
878 | struct ceph_mds_request *req; |
879 | int err; | |
880 | ||
881 | if (ceph_snap(old_dir) != ceph_snap(new_dir)) | |
882 | return -EXDEV; | |
883 | if (ceph_snap(old_dir) != CEPH_NOSNAP || | |
884 | ceph_snap(new_dir) != CEPH_NOSNAP) | |
885 | return -EROFS; | |
886 | dout("rename dir %p dentry %p to dir %p dentry %p\n", | |
887 | old_dir, old_dentry, new_dir, new_dentry); | |
888 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RENAME, USE_AUTH_MDS); | |
889 | if (IS_ERR(req)) | |
890 | return PTR_ERR(req); | |
891 | req->r_dentry = dget(new_dentry); | |
892 | req->r_num_caps = 2; | |
893 | req->r_old_dentry = dget(old_dentry); | |
41b02e1f | 894 | req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry); |
2817b000 SW |
895 | req->r_locked_dir = new_dir; |
896 | req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED; | |
897 | req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL; | |
898 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
899 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
900 | /* release LINK_RDCACHE on source inode (mds will lock it) */ | |
901 | req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; | |
902 | if (new_dentry->d_inode) | |
903 | req->r_inode_drop = drop_caps_for_unlink(new_dentry->d_inode); | |
904 | err = ceph_mdsc_do_request(mdsc, old_dir, req); | |
905 | if (!err && !req->r_reply_info.head->is_dentry) { | |
906 | /* | |
907 | * Normally d_move() is done by fill_trace (called by | |
908 | * do_request, above). If there is no trace, we need | |
909 | * to do it here. | |
910 | */ | |
ea1409f9 SW |
911 | |
912 | /* d_move screws up d_subdirs order */ | |
2f276c51 | 913 | ceph_dir_clear_complete(new_dir); |
ea1409f9 | 914 | |
2817b000 | 915 | d_move(old_dentry, new_dentry); |
ea1409f9 SW |
916 | |
917 | /* ensure target dentry is invalidated, despite | |
918 | rehashing bug in vfs_rename_dir */ | |
81a6cf2d | 919 | ceph_invalidate_dentry_lease(new_dentry); |
2817b000 SW |
920 | } |
921 | ceph_mdsc_put_request(req); | |
922 | return err; | |
923 | } | |
924 | ||
81a6cf2d SW |
925 | /* |
926 | * Ensure a dentry lease will no longer revalidate. | |
927 | */ | |
928 | void ceph_invalidate_dentry_lease(struct dentry *dentry) | |
929 | { | |
930 | spin_lock(&dentry->d_lock); | |
931 | dentry->d_time = jiffies; | |
932 | ceph_dentry(dentry)->lease_shared_gen = 0; | |
933 | spin_unlock(&dentry->d_lock); | |
934 | } | |
2817b000 SW |
935 | |
936 | /* | |
937 | * Check if dentry lease is valid. If not, delete the lease. Try to | |
938 | * renew if the least is more than half up. | |
939 | */ | |
940 | static int dentry_lease_is_valid(struct dentry *dentry) | |
941 | { | |
942 | struct ceph_dentry_info *di; | |
943 | struct ceph_mds_session *s; | |
944 | int valid = 0; | |
945 | u32 gen; | |
946 | unsigned long ttl; | |
947 | struct ceph_mds_session *session = NULL; | |
948 | struct inode *dir = NULL; | |
949 | u32 seq = 0; | |
950 | ||
951 | spin_lock(&dentry->d_lock); | |
952 | di = ceph_dentry(dentry); | |
3d8eb7a9 | 953 | if (di->lease_session) { |
2817b000 | 954 | s = di->lease_session; |
d8fb02ab | 955 | spin_lock(&s->s_gen_ttl_lock); |
2817b000 SW |
956 | gen = s->s_cap_gen; |
957 | ttl = s->s_cap_ttl; | |
d8fb02ab | 958 | spin_unlock(&s->s_gen_ttl_lock); |
2817b000 SW |
959 | |
960 | if (di->lease_gen == gen && | |
961 | time_before(jiffies, dentry->d_time) && | |
962 | time_before(jiffies, ttl)) { | |
963 | valid = 1; | |
964 | if (di->lease_renew_after && | |
965 | time_after(jiffies, di->lease_renew_after)) { | |
966 | /* we should renew */ | |
967 | dir = dentry->d_parent->d_inode; | |
968 | session = ceph_get_mds_session(s); | |
969 | seq = di->lease_seq; | |
970 | di->lease_renew_after = 0; | |
971 | di->lease_renew_from = jiffies; | |
972 | } | |
2817b000 SW |
973 | } |
974 | } | |
975 | spin_unlock(&dentry->d_lock); | |
976 | ||
977 | if (session) { | |
978 | ceph_mdsc_lease_send_msg(session, dir, dentry, | |
979 | CEPH_MDS_LEASE_RENEW, seq); | |
980 | ceph_put_mds_session(session); | |
981 | } | |
982 | dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid); | |
983 | return valid; | |
984 | } | |
985 | ||
986 | /* | |
987 | * Check if directory-wide content lease/cap is valid. | |
988 | */ | |
989 | static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry) | |
990 | { | |
991 | struct ceph_inode_info *ci = ceph_inode(dir); | |
992 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
993 | int valid = 0; | |
994 | ||
be655596 | 995 | spin_lock(&ci->i_ceph_lock); |
2817b000 SW |
996 | if (ci->i_shared_gen == di->lease_shared_gen) |
997 | valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1); | |
be655596 | 998 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
999 | dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n", |
1000 | dir, (unsigned)ci->i_shared_gen, dentry, | |
1001 | (unsigned)di->lease_shared_gen, valid); | |
1002 | return valid; | |
1003 | } | |
1004 | ||
1005 | /* | |
1006 | * Check if cached dentry can be trusted. | |
1007 | */ | |
0b728e19 | 1008 | static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags) |
2817b000 | 1009 | { |
bf1c6aca | 1010 | int valid = 0; |
34286d66 NP |
1011 | struct inode *dir; |
1012 | ||
0b728e19 | 1013 | if (flags & LOOKUP_RCU) |
34286d66 NP |
1014 | return -ECHILD; |
1015 | ||
1cd3935b SW |
1016 | dout("d_revalidate %p '%.*s' inode %p offset %lld\n", dentry, |
1017 | dentry->d_name.len, dentry->d_name.name, dentry->d_inode, | |
1018 | ceph_dentry(dentry)->offset); | |
2817b000 | 1019 | |
bf1c6aca SW |
1020 | dir = ceph_get_dentry_parent_inode(dentry); |
1021 | ||
2817b000 SW |
1022 | /* always trust cached snapped dentries, snapdir dentry */ |
1023 | if (ceph_snap(dir) != CEPH_NOSNAP) { | |
1024 | dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry, | |
1025 | dentry->d_name.len, dentry->d_name.name, dentry->d_inode); | |
bf1c6aca SW |
1026 | valid = 1; |
1027 | } else if (dentry->d_inode && | |
1028 | ceph_snap(dentry->d_inode) == CEPH_SNAPDIR) { | |
1029 | valid = 1; | |
1030 | } else if (dentry_lease_is_valid(dentry) || | |
1031 | dir_lease_is_valid(dir, dentry)) { | |
1032 | valid = 1; | |
2817b000 | 1033 | } |
2817b000 | 1034 | |
bf1c6aca SW |
1035 | dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid"); |
1036 | if (valid) | |
1037 | ceph_dentry_lru_touch(dentry); | |
1038 | else | |
1039 | d_drop(dentry); | |
1040 | iput(dir); | |
1041 | return valid; | |
2817b000 SW |
1042 | } |
1043 | ||
1044 | /* | |
147851d2 | 1045 | * Release our ceph_dentry_info. |
2817b000 | 1046 | */ |
147851d2 | 1047 | static void ceph_d_release(struct dentry *dentry) |
2817b000 SW |
1048 | { |
1049 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
2817b000 | 1050 | |
147851d2 | 1051 | dout("d_release %p\n", dentry); |
3d8eb7a9 SW |
1052 | ceph_dentry_lru_del(dentry); |
1053 | if (di->lease_session) | |
1054 | ceph_put_mds_session(di->lease_session); | |
1055 | kmem_cache_free(ceph_dentry_cachep, di); | |
1056 | dentry->d_fsdata = NULL; | |
2817b000 SW |
1057 | } |
1058 | ||
1059 | static int ceph_snapdir_d_revalidate(struct dentry *dentry, | |
0b728e19 | 1060 | unsigned int flags) |
2817b000 SW |
1061 | { |
1062 | /* | |
1063 | * Eventually, we'll want to revalidate snapped metadata | |
1064 | * too... probably... | |
1065 | */ | |
1066 | return 1; | |
1067 | } | |
1068 | ||
b58dc410 SW |
1069 | /* |
1070 | * When the VFS prunes a dentry from the cache, we need to clear the | |
1071 | * complete flag on the parent directory. | |
1072 | * | |
1073 | * Called under dentry->d_lock. | |
1074 | */ | |
1075 | static void ceph_d_prune(struct dentry *dentry) | |
1076 | { | |
774ac21d | 1077 | dout("ceph_d_prune %p\n", dentry); |
b58dc410 SW |
1078 | |
1079 | /* do we have a valid parent? */ | |
8842b3be | 1080 | if (IS_ROOT(dentry)) |
b58dc410 SW |
1081 | return; |
1082 | ||
2f276c51 | 1083 | /* if we are not hashed, we don't affect dir's completeness */ |
b58dc410 SW |
1084 | if (d_unhashed(dentry)) |
1085 | return; | |
2817b000 | 1086 | |
b58dc410 SW |
1087 | /* |
1088 | * we hold d_lock, so d_parent is stable, and d_fsdata is never | |
1089 | * cleared until d_release | |
1090 | */ | |
2f276c51 | 1091 | ceph_dir_clear_complete(dentry->d_parent->d_inode); |
b58dc410 | 1092 | } |
2817b000 SW |
1093 | |
1094 | /* | |
1095 | * read() on a dir. This weird interface hack only works if mounted | |
1096 | * with '-o dirstat'. | |
1097 | */ | |
1098 | static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, | |
1099 | loff_t *ppos) | |
1100 | { | |
1101 | struct ceph_file_info *cf = file->private_data; | |
496ad9aa | 1102 | struct inode *inode = file_inode(file); |
2817b000 SW |
1103 | struct ceph_inode_info *ci = ceph_inode(inode); |
1104 | int left; | |
ae598083 | 1105 | const int bufsize = 1024; |
2817b000 | 1106 | |
3d14c5d2 | 1107 | if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT)) |
2817b000 SW |
1108 | return -EISDIR; |
1109 | ||
1110 | if (!cf->dir_info) { | |
ae598083 | 1111 | cf->dir_info = kmalloc(bufsize, GFP_NOFS); |
2817b000 SW |
1112 | if (!cf->dir_info) |
1113 | return -ENOMEM; | |
1114 | cf->dir_info_len = | |
ae598083 | 1115 | snprintf(cf->dir_info, bufsize, |
2817b000 SW |
1116 | "entries: %20lld\n" |
1117 | " files: %20lld\n" | |
1118 | " subdirs: %20lld\n" | |
1119 | "rentries: %20lld\n" | |
1120 | " rfiles: %20lld\n" | |
1121 | " rsubdirs: %20lld\n" | |
1122 | "rbytes: %20lld\n" | |
1123 | "rctime: %10ld.%09ld\n", | |
1124 | ci->i_files + ci->i_subdirs, | |
1125 | ci->i_files, | |
1126 | ci->i_subdirs, | |
1127 | ci->i_rfiles + ci->i_rsubdirs, | |
1128 | ci->i_rfiles, | |
1129 | ci->i_rsubdirs, | |
1130 | ci->i_rbytes, | |
1131 | (long)ci->i_rctime.tv_sec, | |
1132 | (long)ci->i_rctime.tv_nsec); | |
1133 | } | |
1134 | ||
1135 | if (*ppos >= cf->dir_info_len) | |
1136 | return 0; | |
1137 | size = min_t(unsigned, size, cf->dir_info_len-*ppos); | |
1138 | left = copy_to_user(buf, cf->dir_info + *ppos, size); | |
1139 | if (left == size) | |
1140 | return -EFAULT; | |
1141 | *ppos += (size - left); | |
1142 | return size - left; | |
1143 | } | |
1144 | ||
1145 | /* | |
1146 | * an fsync() on a dir will wait for any uncommitted directory | |
1147 | * operations to commit. | |
1148 | */ | |
02c24a82 JB |
1149 | static int ceph_dir_fsync(struct file *file, loff_t start, loff_t end, |
1150 | int datasync) | |
2817b000 | 1151 | { |
496ad9aa | 1152 | struct inode *inode = file_inode(file); |
2817b000 SW |
1153 | struct ceph_inode_info *ci = ceph_inode(inode); |
1154 | struct list_head *head = &ci->i_unsafe_dirops; | |
1155 | struct ceph_mds_request *req; | |
1156 | u64 last_tid; | |
1157 | int ret = 0; | |
1158 | ||
1159 | dout("dir_fsync %p\n", inode); | |
02c24a82 JB |
1160 | ret = filemap_write_and_wait_range(inode->i_mapping, start, end); |
1161 | if (ret) | |
1162 | return ret; | |
1163 | mutex_lock(&inode->i_mutex); | |
1164 | ||
2817b000 SW |
1165 | spin_lock(&ci->i_unsafe_lock); |
1166 | if (list_empty(head)) | |
1167 | goto out; | |
1168 | ||
1169 | req = list_entry(head->prev, | |
1170 | struct ceph_mds_request, r_unsafe_dir_item); | |
1171 | last_tid = req->r_tid; | |
1172 | ||
1173 | do { | |
1174 | ceph_mdsc_get_request(req); | |
1175 | spin_unlock(&ci->i_unsafe_lock); | |
2ff179e6 | 1176 | |
2817b000 SW |
1177 | dout("dir_fsync %p wait on tid %llu (until %llu)\n", |
1178 | inode, req->r_tid, last_tid); | |
1179 | if (req->r_timeout) { | |
1180 | ret = wait_for_completion_timeout( | |
1181 | &req->r_safe_completion, req->r_timeout); | |
1182 | if (ret > 0) | |
1183 | ret = 0; | |
1184 | else if (ret == 0) | |
1185 | ret = -EIO; /* timed out */ | |
1186 | } else { | |
1187 | wait_for_completion(&req->r_safe_completion); | |
1188 | } | |
2817b000 SW |
1189 | ceph_mdsc_put_request(req); |
1190 | ||
2ff179e6 | 1191 | spin_lock(&ci->i_unsafe_lock); |
2817b000 SW |
1192 | if (ret || list_empty(head)) |
1193 | break; | |
1194 | req = list_entry(head->next, | |
1195 | struct ceph_mds_request, r_unsafe_dir_item); | |
1196 | } while (req->r_tid < last_tid); | |
1197 | out: | |
1198 | spin_unlock(&ci->i_unsafe_lock); | |
02c24a82 JB |
1199 | mutex_unlock(&inode->i_mutex); |
1200 | ||
2817b000 SW |
1201 | return ret; |
1202 | } | |
1203 | ||
1204 | /* | |
1205 | * We maintain a private dentry LRU. | |
1206 | * | |
1207 | * FIXME: this needs to be changed to a per-mds lru to be useful. | |
1208 | */ | |
1209 | void ceph_dentry_lru_add(struct dentry *dn) | |
1210 | { | |
1211 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1212 | struct ceph_mds_client *mdsc; | |
2817b000 | 1213 | |
04a419f9 SW |
1214 | dout("dentry_lru_add %p %p '%.*s'\n", di, dn, |
1215 | dn->d_name.len, dn->d_name.name); | |
3d8eb7a9 SW |
1216 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
1217 | spin_lock(&mdsc->dentry_lru_lock); | |
1218 | list_add_tail(&di->lru, &mdsc->dentry_lru); | |
1219 | mdsc->num_dentry++; | |
1220 | spin_unlock(&mdsc->dentry_lru_lock); | |
2817b000 SW |
1221 | } |
1222 | ||
1223 | void ceph_dentry_lru_touch(struct dentry *dn) | |
1224 | { | |
1225 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1226 | struct ceph_mds_client *mdsc; | |
2817b000 | 1227 | |
1cd3935b SW |
1228 | dout("dentry_lru_touch %p %p '%.*s' (offset %lld)\n", di, dn, |
1229 | dn->d_name.len, dn->d_name.name, di->offset); | |
3d8eb7a9 SW |
1230 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
1231 | spin_lock(&mdsc->dentry_lru_lock); | |
1232 | list_move_tail(&di->lru, &mdsc->dentry_lru); | |
1233 | spin_unlock(&mdsc->dentry_lru_lock); | |
2817b000 SW |
1234 | } |
1235 | ||
1236 | void ceph_dentry_lru_del(struct dentry *dn) | |
1237 | { | |
1238 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1239 | struct ceph_mds_client *mdsc; | |
1240 | ||
04a419f9 SW |
1241 | dout("dentry_lru_del %p %p '%.*s'\n", di, dn, |
1242 | dn->d_name.len, dn->d_name.name); | |
3d8eb7a9 SW |
1243 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
1244 | spin_lock(&mdsc->dentry_lru_lock); | |
1245 | list_del_init(&di->lru); | |
1246 | mdsc->num_dentry--; | |
1247 | spin_unlock(&mdsc->dentry_lru_lock); | |
2817b000 SW |
1248 | } |
1249 | ||
6c0f3af7 SW |
1250 | /* |
1251 | * Return name hash for a given dentry. This is dependent on | |
1252 | * the parent directory's hash function. | |
1253 | */ | |
e5f86dc3 | 1254 | unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn) |
6c0f3af7 | 1255 | { |
6c0f3af7 SW |
1256 | struct ceph_inode_info *dci = ceph_inode(dir); |
1257 | ||
1258 | switch (dci->i_dir_layout.dl_dir_hash) { | |
1259 | case 0: /* for backward compat */ | |
1260 | case CEPH_STR_HASH_LINUX: | |
1261 | return dn->d_name.hash; | |
1262 | ||
1263 | default: | |
1264 | return ceph_str_hash(dci->i_dir_layout.dl_dir_hash, | |
1265 | dn->d_name.name, dn->d_name.len); | |
1266 | } | |
1267 | } | |
1268 | ||
2817b000 SW |
1269 | const struct file_operations ceph_dir_fops = { |
1270 | .read = ceph_read_dir, | |
1271 | .readdir = ceph_readdir, | |
1272 | .llseek = ceph_dir_llseek, | |
1273 | .open = ceph_open, | |
1274 | .release = ceph_release, | |
1275 | .unlocked_ioctl = ceph_ioctl, | |
1276 | .fsync = ceph_dir_fsync, | |
1277 | }; | |
1278 | ||
1279 | const struct inode_operations ceph_dir_iops = { | |
1280 | .lookup = ceph_lookup, | |
1281 | .permission = ceph_permission, | |
1282 | .getattr = ceph_getattr, | |
1283 | .setattr = ceph_setattr, | |
1284 | .setxattr = ceph_setxattr, | |
1285 | .getxattr = ceph_getxattr, | |
1286 | .listxattr = ceph_listxattr, | |
1287 | .removexattr = ceph_removexattr, | |
1288 | .mknod = ceph_mknod, | |
1289 | .symlink = ceph_symlink, | |
1290 | .mkdir = ceph_mkdir, | |
1291 | .link = ceph_link, | |
1292 | .unlink = ceph_unlink, | |
1293 | .rmdir = ceph_unlink, | |
1294 | .rename = ceph_rename, | |
1295 | .create = ceph_create, | |
2d83bde9 | 1296 | .atomic_open = ceph_atomic_open, |
2817b000 SW |
1297 | }; |
1298 | ||
52dfb8ac | 1299 | const struct dentry_operations ceph_dentry_ops = { |
2817b000 | 1300 | .d_revalidate = ceph_d_revalidate, |
147851d2 | 1301 | .d_release = ceph_d_release, |
b58dc410 | 1302 | .d_prune = ceph_d_prune, |
2817b000 SW |
1303 | }; |
1304 | ||
52dfb8ac | 1305 | const struct dentry_operations ceph_snapdir_dentry_ops = { |
2817b000 | 1306 | .d_revalidate = ceph_snapdir_d_revalidate, |
147851d2 | 1307 | .d_release = ceph_d_release, |
2817b000 SW |
1308 | }; |
1309 | ||
52dfb8ac | 1310 | const struct dentry_operations ceph_snap_dentry_ops = { |
147851d2 | 1311 | .d_release = ceph_d_release, |
b58dc410 | 1312 | .d_prune = ceph_d_prune, |
2817b000 | 1313 | }; |