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 | */ | |
77acfa29 | 114 | static int __dcache_readdir(struct file *file, struct dir_context *ctx) |
2817b000 | 115 | { |
77acfa29 AV |
116 | struct ceph_file_info *fi = file->private_data; |
117 | struct dentry *parent = file->f_dentry; | |
2817b000 SW |
118 | struct inode *dir = parent->d_inode; |
119 | struct list_head *p; | |
120 | struct dentry *dentry, *last; | |
121 | struct ceph_dentry_info *di; | |
122 | int err = 0; | |
123 | ||
124 | /* claim ref on last dentry we returned */ | |
125 | last = fi->dentry; | |
126 | fi->dentry = NULL; | |
127 | ||
77acfa29 | 128 | dout("__dcache_readdir %p at %llu (last %p)\n", dir, ctx->pos, |
2817b000 SW |
129 | last); |
130 | ||
2fd6b7f5 | 131 | spin_lock(&parent->d_lock); |
2817b000 SW |
132 | |
133 | /* start at beginning? */ | |
77acfa29 AV |
134 | if (ctx->pos == 2 || last == NULL || |
135 | ctx->pos < ceph_dentry(last)->offset) { | |
2817b000 SW |
136 | if (list_empty(&parent->d_subdirs)) |
137 | goto out_unlock; | |
138 | p = parent->d_subdirs.prev; | |
139 | dout(" initial p %p/%p\n", p->prev, p->next); | |
140 | } else { | |
141 | p = last->d_u.d_child.prev; | |
142 | } | |
143 | ||
144 | more: | |
145 | dentry = list_entry(p, struct dentry, d_u.d_child); | |
146 | di = ceph_dentry(dentry); | |
147 | while (1) { | |
1cd3935b SW |
148 | dout(" p %p/%p %s d_subdirs %p/%p\n", p->prev, p->next, |
149 | d_unhashed(dentry) ? "!hashed" : "hashed", | |
2817b000 SW |
150 | parent->d_subdirs.prev, parent->d_subdirs.next); |
151 | if (p == &parent->d_subdirs) { | |
9cfa1098 | 152 | fi->flags |= CEPH_F_ATEND; |
2817b000 SW |
153 | goto out_unlock; |
154 | } | |
2fd6b7f5 | 155 | spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED); |
2817b000 | 156 | if (!d_unhashed(dentry) && dentry->d_inode && |
09b8a7d2 | 157 | ceph_snap(dentry->d_inode) != CEPH_SNAPDIR && |
1d1de916 | 158 | ceph_ino(dentry->d_inode) != CEPH_INO_CEPH && |
77acfa29 | 159 | ctx->pos <= di->offset) |
2817b000 SW |
160 | break; |
161 | dout(" skipping %p %.*s at %llu (%llu)%s%s\n", dentry, | |
162 | dentry->d_name.len, dentry->d_name.name, di->offset, | |
77acfa29 | 163 | ctx->pos, d_unhashed(dentry) ? " unhashed" : "", |
2817b000 | 164 | !dentry->d_inode ? " null" : ""); |
da502956 | 165 | spin_unlock(&dentry->d_lock); |
2817b000 SW |
166 | p = p->prev; |
167 | dentry = list_entry(p, struct dentry, d_u.d_child); | |
168 | di = ceph_dentry(dentry); | |
169 | } | |
170 | ||
da502956 | 171 | dget_dlock(dentry); |
b7ab39f6 | 172 | spin_unlock(&dentry->d_lock); |
2fd6b7f5 | 173 | spin_unlock(&parent->d_lock); |
2817b000 | 174 | |
77acfa29 | 175 | dout(" %llu (%llu) dentry %p %.*s %p\n", di->offset, ctx->pos, |
2817b000 | 176 | dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode); |
77acfa29 AV |
177 | ctx->pos = di->offset; |
178 | if (!dir_emit(ctx, dentry->d_name.name, | |
179 | dentry->d_name.len, | |
ad1fee96 | 180 | ceph_translate_ino(dentry->d_sb, dentry->d_inode->i_ino), |
77acfa29 AV |
181 | dentry->d_inode->i_mode >> 12)) { |
182 | if (last) { | |
2817b000 SW |
183 | /* remember our position */ |
184 | fi->dentry = last; | |
185 | fi->next_offset = di->offset; | |
2817b000 | 186 | } |
77acfa29 AV |
187 | dput(dentry); |
188 | return 0; | |
2817b000 | 189 | } |
f5b06628 | 190 | |
77acfa29 AV |
191 | if (last) |
192 | dput(last); | |
193 | last = dentry; | |
2817b000 | 194 | |
77acfa29 | 195 | ctx->pos++; |
2817b000 | 196 | |
b5c84bf6 | 197 | /* make sure a dentry wasn't dropped while we didn't have parent lock */ |
2f276c51 YZ |
198 | if (!ceph_dir_is_complete(dir)) { |
199 | dout(" lost dir complete on %p; falling back to mds\n", dir); | |
efa4c120 SW |
200 | err = -EAGAIN; |
201 | goto out; | |
202 | } | |
203 | ||
2fd6b7f5 | 204 | spin_lock(&parent->d_lock); |
efa4c120 SW |
205 | p = p->prev; /* advance to next dentry */ |
206 | goto more; | |
2817b000 SW |
207 | |
208 | out_unlock: | |
2fd6b7f5 | 209 | spin_unlock(&parent->d_lock); |
efa4c120 SW |
210 | out: |
211 | if (last) | |
2817b000 | 212 | dput(last); |
2817b000 SW |
213 | return err; |
214 | } | |
215 | ||
216 | /* | |
217 | * make note of the last dentry we read, so we can | |
218 | * continue at the same lexicographical point, | |
219 | * regardless of what dir changes take place on the | |
220 | * server. | |
221 | */ | |
222 | static int note_last_dentry(struct ceph_file_info *fi, const char *name, | |
223 | int len) | |
224 | { | |
225 | kfree(fi->last_name); | |
226 | fi->last_name = kmalloc(len+1, GFP_NOFS); | |
227 | if (!fi->last_name) | |
228 | return -ENOMEM; | |
229 | memcpy(fi->last_name, name, len); | |
230 | fi->last_name[len] = 0; | |
231 | dout("note_last_dentry '%s'\n", fi->last_name); | |
232 | return 0; | |
233 | } | |
234 | ||
77acfa29 | 235 | static int ceph_readdir(struct file *file, struct dir_context *ctx) |
2817b000 | 236 | { |
77acfa29 AV |
237 | struct ceph_file_info *fi = file->private_data; |
238 | struct inode *inode = file_inode(file); | |
2817b000 | 239 | struct ceph_inode_info *ci = ceph_inode(inode); |
3d14c5d2 YS |
240 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
241 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
77acfa29 AV |
242 | unsigned frag = fpos_frag(ctx->pos); |
243 | int off = fpos_off(ctx->pos); | |
2817b000 SW |
244 | int err; |
245 | u32 ftype; | |
246 | struct ceph_mds_reply_info_parsed *rinfo; | |
3d14c5d2 YS |
247 | const int max_entries = fsc->mount_options->max_readdir; |
248 | const int max_bytes = fsc->mount_options->max_readdir_bytes; | |
2817b000 | 249 | |
77acfa29 | 250 | dout("readdir %p file %p frag %u off %u\n", inode, file, frag, off); |
9cfa1098 | 251 | if (fi->flags & CEPH_F_ATEND) |
2817b000 SW |
252 | return 0; |
253 | ||
254 | /* always start with . and .. */ | |
77acfa29 | 255 | if (ctx->pos == 0) { |
2817b000 SW |
256 | /* note dir version at start of readdir so we can tell |
257 | * if any dentries get dropped */ | |
2f276c51 | 258 | fi->dir_release_count = atomic_read(&ci->i_release_count); |
2817b000 SW |
259 | |
260 | dout("readdir off 0 -> '.'\n"); | |
77acfa29 | 261 | if (!dir_emit(ctx, ".", 1, |
ad1fee96 | 262 | ceph_translate_ino(inode->i_sb, inode->i_ino), |
77acfa29 | 263 | inode->i_mode >> 12)) |
2817b000 | 264 | return 0; |
77acfa29 | 265 | ctx->pos = 1; |
2817b000 SW |
266 | off = 1; |
267 | } | |
77acfa29 AV |
268 | if (ctx->pos == 1) { |
269 | ino_t ino = parent_ino(file->f_dentry); | |
2817b000 | 270 | dout("readdir off 1 -> '..'\n"); |
77acfa29 | 271 | if (!dir_emit(ctx, "..", 2, |
ad1fee96 | 272 | ceph_translate_ino(inode->i_sb, ino), |
77acfa29 | 273 | inode->i_mode >> 12)) |
2817b000 | 274 | return 0; |
77acfa29 | 275 | ctx->pos = 2; |
2817b000 SW |
276 | off = 2; |
277 | } | |
278 | ||
279 | /* can we use the dcache? */ | |
be655596 | 280 | spin_lock(&ci->i_ceph_lock); |
77acfa29 | 281 | if ((ctx->pos == 2 || fi->dentry) && |
3d14c5d2 | 282 | !ceph_test_mount_opt(fsc, NOASYNCREADDIR) && |
a0dff78d | 283 | ceph_snap(inode) != CEPH_SNAPDIR && |
2f276c51 | 284 | __ceph_dir_is_complete(ci) && |
2817b000 | 285 | __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) { |
be655596 | 286 | spin_unlock(&ci->i_ceph_lock); |
77acfa29 | 287 | err = __dcache_readdir(file, ctx); |
efa4c120 | 288 | if (err != -EAGAIN) |
2817b000 | 289 | return err; |
efa4c120 | 290 | } else { |
be655596 | 291 | spin_unlock(&ci->i_ceph_lock); |
2817b000 | 292 | } |
2817b000 SW |
293 | if (fi->dentry) { |
294 | err = note_last_dentry(fi, fi->dentry->d_name.name, | |
295 | fi->dentry->d_name.len); | |
296 | if (err) | |
297 | return err; | |
298 | dput(fi->dentry); | |
299 | fi->dentry = NULL; | |
300 | } | |
301 | ||
302 | /* proceed with a normal readdir */ | |
303 | ||
304 | more: | |
305 | /* do we have the correct frag content buffered? */ | |
306 | if (fi->frag != frag || fi->last_readdir == NULL) { | |
307 | struct ceph_mds_request *req; | |
308 | int op = ceph_snap(inode) == CEPH_SNAPDIR ? | |
309 | CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR; | |
310 | ||
311 | /* discard old result, if any */ | |
393f6620 | 312 | if (fi->last_readdir) { |
2817b000 | 313 | ceph_mdsc_put_request(fi->last_readdir); |
393f6620 SW |
314 | fi->last_readdir = NULL; |
315 | } | |
2817b000 SW |
316 | |
317 | /* requery frag tree, as the frag topology may have changed */ | |
318 | frag = ceph_choose_frag(ceph_inode(inode), frag, NULL, NULL); | |
319 | ||
320 | dout("readdir fetching %llx.%llx frag %x offset '%s'\n", | |
321 | ceph_vinop(inode), frag, fi->last_name); | |
322 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
323 | if (IS_ERR(req)) | |
324 | return PTR_ERR(req); | |
70b666c3 SW |
325 | req->r_inode = inode; |
326 | ihold(inode); | |
77acfa29 | 327 | req->r_dentry = dget(file->f_dentry); |
2817b000 SW |
328 | /* hints to request -> mds selection code */ |
329 | req->r_direct_mode = USE_AUTH_MDS; | |
330 | req->r_direct_hash = ceph_frag_value(frag); | |
331 | req->r_direct_is_hash = true; | |
332 | req->r_path2 = kstrdup(fi->last_name, GFP_NOFS); | |
333 | req->r_readdir_offset = fi->next_offset; | |
334 | req->r_args.readdir.frag = cpu_to_le32(frag); | |
335 | req->r_args.readdir.max_entries = cpu_to_le32(max_entries); | |
23804d91 | 336 | req->r_args.readdir.max_bytes = cpu_to_le32(max_bytes); |
e1e4dd0c | 337 | req->r_num_caps = max_entries + 1; |
2817b000 SW |
338 | err = ceph_mdsc_do_request(mdsc, NULL, req); |
339 | if (err < 0) { | |
340 | ceph_mdsc_put_request(req); | |
341 | return err; | |
342 | } | |
343 | dout("readdir got and parsed readdir result=%d" | |
344 | " on frag %x, end=%d, complete=%d\n", err, frag, | |
345 | (int)req->r_reply_info.dir_end, | |
346 | (int)req->r_reply_info.dir_complete); | |
347 | ||
348 | if (!req->r_did_prepopulate) { | |
349 | dout("readdir !did_prepopulate"); | |
2f276c51 YZ |
350 | /* preclude from marking dir complete */ |
351 | fi->dir_release_count--; | |
2817b000 SW |
352 | } |
353 | ||
354 | /* note next offset and last dentry name */ | |
355 | fi->offset = fi->next_offset; | |
356 | fi->last_readdir = req; | |
357 | ||
358 | if (req->r_reply_info.dir_end) { | |
359 | kfree(fi->last_name); | |
360 | fi->last_name = NULL; | |
7b88dadc SW |
361 | if (ceph_frag_is_rightmost(frag)) |
362 | fi->next_offset = 2; | |
363 | else | |
364 | fi->next_offset = 0; | |
2817b000 SW |
365 | } else { |
366 | rinfo = &req->r_reply_info; | |
367 | err = note_last_dentry(fi, | |
368 | rinfo->dir_dname[rinfo->dir_nr-1], | |
369 | rinfo->dir_dname_len[rinfo->dir_nr-1]); | |
370 | if (err) | |
371 | return err; | |
372 | fi->next_offset += rinfo->dir_nr; | |
373 | } | |
374 | } | |
375 | ||
376 | rinfo = &fi->last_readdir->r_reply_info; | |
377 | dout("readdir frag %x num %d off %d chunkoff %d\n", frag, | |
378 | rinfo->dir_nr, off, fi->offset); | |
77acfa29 AV |
379 | |
380 | ctx->pos = ceph_make_fpos(frag, off); | |
da39822c | 381 | while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) { |
2817b000 SW |
382 | struct ceph_mds_reply_inode *in = |
383 | rinfo->dir_in[off - fi->offset].in; | |
3105c19c SW |
384 | struct ceph_vino vino; |
385 | ino_t ino; | |
386 | ||
2817b000 | 387 | dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n", |
77acfa29 | 388 | off, off - fi->offset, rinfo->dir_nr, ctx->pos, |
2817b000 SW |
389 | rinfo->dir_dname_len[off - fi->offset], |
390 | rinfo->dir_dname[off - fi->offset], in); | |
391 | BUG_ON(!in); | |
392 | ftype = le32_to_cpu(in->mode) >> 12; | |
3105c19c SW |
393 | vino.ino = le64_to_cpu(in->ino); |
394 | vino.snap = le64_to_cpu(in->snapid); | |
395 | ino = ceph_vino_to_ino(vino); | |
77acfa29 | 396 | if (!dir_emit(ctx, |
2817b000 SW |
397 | rinfo->dir_dname[off - fi->offset], |
398 | rinfo->dir_dname_len[off - fi->offset], | |
77acfa29 | 399 | ceph_translate_ino(inode->i_sb, ino), ftype)) { |
2817b000 SW |
400 | dout("filldir stopping us...\n"); |
401 | return 0; | |
402 | } | |
403 | off++; | |
77acfa29 | 404 | ctx->pos++; |
2817b000 SW |
405 | } |
406 | ||
407 | if (fi->last_name) { | |
408 | ceph_mdsc_put_request(fi->last_readdir); | |
409 | fi->last_readdir = NULL; | |
410 | goto more; | |
411 | } | |
412 | ||
413 | /* more frags? */ | |
414 | if (!ceph_frag_is_rightmost(frag)) { | |
415 | frag = ceph_frag_next(frag); | |
416 | off = 0; | |
77acfa29 | 417 | ctx->pos = ceph_make_fpos(frag, off); |
2817b000 SW |
418 | dout("readdir next frag is %x\n", frag); |
419 | goto more; | |
420 | } | |
9cfa1098 | 421 | fi->flags |= CEPH_F_ATEND; |
2817b000 SW |
422 | |
423 | /* | |
424 | * if dir_release_count still matches the dir, no dentries | |
425 | * were released during the whole readdir, and we should have | |
426 | * the complete dir contents in our cache. | |
427 | */ | |
be655596 | 428 | spin_lock(&ci->i_ceph_lock); |
2f276c51 | 429 | if (atomic_read(&ci->i_release_count) == fi->dir_release_count) { |
a8673d61 | 430 | dout(" marking %p complete\n", inode); |
2f276c51 | 431 | __ceph_dir_set_complete(ci, fi->dir_release_count); |
77acfa29 | 432 | ci->i_max_offset = ctx->pos; |
2817b000 | 433 | } |
be655596 | 434 | spin_unlock(&ci->i_ceph_lock); |
2817b000 | 435 | |
77acfa29 | 436 | dout("readdir %p file %p done.\n", inode, file); |
2817b000 SW |
437 | return 0; |
438 | } | |
439 | ||
440 | static void reset_readdir(struct ceph_file_info *fi) | |
441 | { | |
442 | if (fi->last_readdir) { | |
443 | ceph_mdsc_put_request(fi->last_readdir); | |
444 | fi->last_readdir = NULL; | |
445 | } | |
446 | kfree(fi->last_name); | |
a1629c3b | 447 | fi->last_name = NULL; |
2817b000 SW |
448 | fi->next_offset = 2; /* compensate for . and .. */ |
449 | if (fi->dentry) { | |
450 | dput(fi->dentry); | |
451 | fi->dentry = NULL; | |
452 | } | |
9cfa1098 | 453 | fi->flags &= ~CEPH_F_ATEND; |
2817b000 SW |
454 | } |
455 | ||
965c8e59 | 456 | static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence) |
2817b000 SW |
457 | { |
458 | struct ceph_file_info *fi = file->private_data; | |
459 | struct inode *inode = file->f_mapping->host; | |
460 | loff_t old_offset = offset; | |
461 | loff_t retval; | |
462 | ||
463 | mutex_lock(&inode->i_mutex); | |
06222e49 | 464 | retval = -EINVAL; |
965c8e59 | 465 | switch (whence) { |
2817b000 SW |
466 | case SEEK_END: |
467 | offset += inode->i_size + 2; /* FIXME */ | |
468 | break; | |
469 | case SEEK_CUR: | |
470 | offset += file->f_pos; | |
06222e49 JB |
471 | case SEEK_SET: |
472 | break; | |
473 | default: | |
474 | goto out; | |
2817b000 | 475 | } |
06222e49 | 476 | |
2817b000 SW |
477 | if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) { |
478 | if (offset != file->f_pos) { | |
479 | file->f_pos = offset; | |
480 | file->f_version = 0; | |
9cfa1098 | 481 | fi->flags &= ~CEPH_F_ATEND; |
2817b000 SW |
482 | } |
483 | retval = offset; | |
484 | ||
485 | /* | |
486 | * discard buffered readdir content on seekdir(0), or | |
487 | * seek to new frag, or seek prior to current chunk. | |
488 | */ | |
489 | if (offset == 0 || | |
490 | fpos_frag(offset) != fpos_frag(old_offset) || | |
491 | fpos_off(offset) < fi->offset) { | |
492 | dout("dir_llseek dropping %p content\n", file); | |
493 | reset_readdir(fi); | |
494 | } | |
495 | ||
496 | /* bump dir_release_count if we did a forward seek */ | |
497 | if (offset > old_offset) | |
498 | fi->dir_release_count--; | |
499 | } | |
06222e49 | 500 | out: |
2817b000 SW |
501 | mutex_unlock(&inode->i_mutex); |
502 | return retval; | |
503 | } | |
504 | ||
505 | /* | |
468640e3 | 506 | * Handle lookups for the hidden .snap directory. |
2817b000 | 507 | */ |
468640e3 SW |
508 | int ceph_handle_snapdir(struct ceph_mds_request *req, |
509 | struct dentry *dentry, int err) | |
2817b000 | 510 | { |
3d14c5d2 | 511 | struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); |
d79698da | 512 | struct inode *parent = dentry->d_parent->d_inode; /* we hold i_mutex */ |
2817b000 SW |
513 | |
514 | /* .snap dir? */ | |
515 | if (err == -ENOENT && | |
455cec0a | 516 | ceph_snap(parent) == CEPH_NOSNAP && |
6b805185 | 517 | strcmp(dentry->d_name.name, |
3d14c5d2 | 518 | fsc->mount_options->snapdir_name) == 0) { |
2817b000 SW |
519 | struct inode *inode = ceph_get_snapdir(parent); |
520 | dout("ENOENT on snapdir %p '%.*s', linking to snapdir %p\n", | |
521 | dentry, dentry->d_name.len, dentry->d_name.name, inode); | |
9358c6d4 | 522 | BUG_ON(!d_unhashed(dentry)); |
2817b000 SW |
523 | d_add(dentry, inode); |
524 | err = 0; | |
525 | } | |
468640e3 SW |
526 | return err; |
527 | } | |
2817b000 | 528 | |
468640e3 SW |
529 | /* |
530 | * Figure out final result of a lookup/open request. | |
531 | * | |
532 | * Mainly, make sure we return the final req->r_dentry (if it already | |
533 | * existed) in place of the original VFS-provided dentry when they | |
534 | * differ. | |
535 | * | |
536 | * Gracefully handle the case where the MDS replies with -ENOENT and | |
537 | * no trace (which it may do, at its discretion, e.g., if it doesn't | |
538 | * care to issue a lease on the negative dentry). | |
539 | */ | |
540 | struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, | |
541 | struct dentry *dentry, int err) | |
542 | { | |
2817b000 SW |
543 | if (err == -ENOENT) { |
544 | /* no trace? */ | |
545 | err = 0; | |
546 | if (!req->r_reply_info.head->is_dentry) { | |
547 | dout("ENOENT and no trace, dentry %p inode %p\n", | |
548 | dentry, dentry->d_inode); | |
549 | if (dentry->d_inode) { | |
550 | d_drop(dentry); | |
551 | err = -ENOENT; | |
552 | } else { | |
553 | d_add(dentry, NULL); | |
554 | } | |
555 | } | |
556 | } | |
557 | if (err) | |
558 | dentry = ERR_PTR(err); | |
559 | else if (dentry != req->r_dentry) | |
560 | dentry = dget(req->r_dentry); /* we got spliced */ | |
561 | else | |
562 | dentry = NULL; | |
563 | return dentry; | |
564 | } | |
565 | ||
1d1de916 SW |
566 | static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry) |
567 | { | |
568 | return ceph_ino(inode) == CEPH_INO_ROOT && | |
569 | strncmp(dentry->d_name.name, ".ceph", 5) == 0; | |
570 | } | |
571 | ||
2817b000 SW |
572 | /* |
573 | * Look up a single dir entry. If there is a lookup intent, inform | |
574 | * the MDS so that it gets our 'caps wanted' value in a single op. | |
575 | */ | |
576 | static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry, | |
00cd8dd3 | 577 | unsigned int flags) |
2817b000 | 578 | { |
3d14c5d2 YS |
579 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
580 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
581 | struct ceph_mds_request *req; |
582 | int op; | |
583 | int err; | |
584 | ||
585 | dout("lookup %p dentry %p '%.*s'\n", | |
586 | dir, dentry, dentry->d_name.len, dentry->d_name.name); | |
587 | ||
588 | if (dentry->d_name.len > NAME_MAX) | |
589 | return ERR_PTR(-ENAMETOOLONG); | |
590 | ||
591 | err = ceph_init_dentry(dentry); | |
592 | if (err < 0) | |
593 | return ERR_PTR(err); | |
594 | ||
2817b000 SW |
595 | /* can we conclude ENOENT locally? */ |
596 | if (dentry->d_inode == NULL) { | |
597 | struct ceph_inode_info *ci = ceph_inode(dir); | |
598 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
599 | ||
be655596 | 600 | spin_lock(&ci->i_ceph_lock); |
2817b000 SW |
601 | dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags); |
602 | if (strncmp(dentry->d_name.name, | |
3d14c5d2 | 603 | fsc->mount_options->snapdir_name, |
2817b000 | 604 | dentry->d_name.len) && |
1d1de916 | 605 | !is_root_ceph_dentry(dir, dentry) && |
2f276c51 | 606 | __ceph_dir_is_complete(ci) && |
2817b000 | 607 | (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) { |
be655596 | 608 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
609 | dout(" dir %p complete, -ENOENT\n", dir); |
610 | d_add(dentry, NULL); | |
611 | di->lease_shared_gen = ci->i_shared_gen; | |
612 | return NULL; | |
613 | } | |
be655596 | 614 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
615 | } |
616 | ||
617 | op = ceph_snap(dir) == CEPH_SNAPDIR ? | |
618 | CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; | |
619 | req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); | |
620 | if (IS_ERR(req)) | |
7e34bc52 | 621 | return ERR_CAST(req); |
2817b000 SW |
622 | req->r_dentry = dget(dentry); |
623 | req->r_num_caps = 2; | |
624 | /* we only need inode linkage */ | |
625 | req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); | |
626 | req->r_locked_dir = dir; | |
627 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
468640e3 | 628 | err = ceph_handle_snapdir(req, dentry, err); |
2817b000 SW |
629 | dentry = ceph_finish_lookup(req, dentry, err); |
630 | ceph_mdsc_put_request(req); /* will dput(dentry) */ | |
631 | dout("lookup result=%p\n", dentry); | |
632 | return dentry; | |
633 | } | |
634 | ||
635 | /* | |
636 | * If we do a create but get no trace back from the MDS, follow up with | |
637 | * a lookup (the VFS expects us to link up the provided dentry). | |
638 | */ | |
639 | int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry) | |
640 | { | |
00cd8dd3 | 641 | struct dentry *result = ceph_lookup(dir, dentry, 0); |
2817b000 SW |
642 | |
643 | if (result && !IS_ERR(result)) { | |
644 | /* | |
645 | * We created the item, then did a lookup, and found | |
646 | * it was already linked to another inode we already | |
647 | * had in our cache (and thus got spliced). Link our | |
648 | * dentry to that inode, but don't hash it, just in | |
649 | * case the VFS wants to dereference it. | |
650 | */ | |
651 | BUG_ON(!result->d_inode); | |
652 | d_instantiate(dentry, result->d_inode); | |
653 | return 0; | |
654 | } | |
655 | return PTR_ERR(result); | |
656 | } | |
657 | ||
658 | static int ceph_mknod(struct inode *dir, struct dentry *dentry, | |
1a67aafb | 659 | umode_t mode, dev_t rdev) |
2817b000 | 660 | { |
3d14c5d2 YS |
661 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
662 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
663 | struct ceph_mds_request *req; |
664 | int err; | |
665 | ||
666 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
667 | return -EROFS; | |
668 | ||
1a67aafb | 669 | dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n", |
2817b000 SW |
670 | dir, dentry, mode, rdev); |
671 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS); | |
672 | if (IS_ERR(req)) { | |
673 | d_drop(dentry); | |
674 | return PTR_ERR(req); | |
675 | } | |
676 | req->r_dentry = dget(dentry); | |
677 | req->r_num_caps = 2; | |
678 | req->r_locked_dir = dir; | |
679 | req->r_args.mknod.mode = cpu_to_le32(mode); | |
680 | req->r_args.mknod.rdev = cpu_to_le32(rdev); | |
681 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
682 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
683 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
684 | if (!err && !req->r_reply_info.head->is_dentry) | |
685 | err = ceph_handle_notrace_create(dir, dentry); | |
686 | ceph_mdsc_put_request(req); | |
687 | if (err) | |
688 | d_drop(dentry); | |
689 | return err; | |
690 | } | |
691 | ||
4acdaf27 | 692 | static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 693 | bool excl) |
2817b000 | 694 | { |
2d83bde9 | 695 | return ceph_mknod(dir, dentry, mode, 0); |
2817b000 SW |
696 | } |
697 | ||
698 | static int ceph_symlink(struct inode *dir, struct dentry *dentry, | |
699 | const char *dest) | |
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 | ||
709 | dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest); | |
710 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS); | |
711 | if (IS_ERR(req)) { | |
712 | d_drop(dentry); | |
713 | return PTR_ERR(req); | |
714 | } | |
715 | req->r_dentry = dget(dentry); | |
716 | req->r_num_caps = 2; | |
717 | req->r_path2 = kstrdup(dest, GFP_NOFS); | |
718 | req->r_locked_dir = dir; | |
719 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
720 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
721 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
722 | if (!err && !req->r_reply_info.head->is_dentry) | |
723 | err = ceph_handle_notrace_create(dir, dentry); | |
724 | ceph_mdsc_put_request(req); | |
725 | if (err) | |
726 | d_drop(dentry); | |
727 | return err; | |
728 | } | |
729 | ||
18bb1db3 | 730 | static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
2817b000 | 731 | { |
3d14c5d2 YS |
732 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
733 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
734 | struct ceph_mds_request *req; |
735 | int err = -EROFS; | |
736 | int op; | |
737 | ||
738 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
739 | /* mkdir .snap/foo is a MKSNAP */ | |
740 | op = CEPH_MDS_OP_MKSNAP; | |
741 | dout("mksnap dir %p snap '%.*s' dn %p\n", dir, | |
742 | dentry->d_name.len, dentry->d_name.name, dentry); | |
743 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { | |
18bb1db3 | 744 | dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode); |
2817b000 SW |
745 | op = CEPH_MDS_OP_MKDIR; |
746 | } else { | |
747 | goto out; | |
748 | } | |
749 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
750 | if (IS_ERR(req)) { | |
751 | err = PTR_ERR(req); | |
752 | goto out; | |
753 | } | |
754 | ||
755 | req->r_dentry = dget(dentry); | |
756 | req->r_num_caps = 2; | |
757 | req->r_locked_dir = dir; | |
758 | req->r_args.mkdir.mode = cpu_to_le32(mode); | |
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 | out: | |
766 | if (err < 0) | |
767 | d_drop(dentry); | |
768 | return err; | |
769 | } | |
770 | ||
771 | static int ceph_link(struct dentry *old_dentry, struct inode *dir, | |
772 | struct dentry *dentry) | |
773 | { | |
3d14c5d2 YS |
774 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
775 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
776 | struct ceph_mds_request *req; |
777 | int err; | |
778 | ||
779 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
780 | return -EROFS; | |
781 | ||
782 | dout("link in dir %p old_dentry %p dentry %p\n", dir, | |
783 | old_dentry, dentry); | |
784 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS); | |
785 | if (IS_ERR(req)) { | |
786 | d_drop(dentry); | |
787 | return PTR_ERR(req); | |
788 | } | |
789 | req->r_dentry = dget(dentry); | |
790 | req->r_num_caps = 2; | |
791 | req->r_old_dentry = dget(old_dentry); /* or inode? hrm. */ | |
41b02e1f | 792 | req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry); |
2817b000 SW |
793 | req->r_locked_dir = dir; |
794 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
795 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
ad88f23f YZ |
796 | /* release LINK_SHARED on source inode (mds will lock it) */ |
797 | req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; | |
2817b000 | 798 | err = ceph_mdsc_do_request(mdsc, dir, req); |
70b666c3 | 799 | if (err) { |
2817b000 | 800 | d_drop(dentry); |
70b666c3 SW |
801 | } else if (!req->r_reply_info.head->is_dentry) { |
802 | ihold(old_dentry->d_inode); | |
803 | d_instantiate(dentry, old_dentry->d_inode); | |
804 | } | |
2817b000 SW |
805 | ceph_mdsc_put_request(req); |
806 | return err; | |
807 | } | |
808 | ||
809 | /* | |
810 | * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it | |
811 | * looks like the link count will hit 0, drop any other caps (other | |
812 | * than PIN) we don't specifically want (due to the file still being | |
813 | * open). | |
814 | */ | |
815 | static int drop_caps_for_unlink(struct inode *inode) | |
816 | { | |
817 | struct ceph_inode_info *ci = ceph_inode(inode); | |
818 | int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; | |
819 | ||
be655596 | 820 | spin_lock(&ci->i_ceph_lock); |
2817b000 SW |
821 | if (inode->i_nlink == 1) { |
822 | drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN); | |
823 | ci->i_ceph_flags |= CEPH_I_NODELAY; | |
824 | } | |
be655596 | 825 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
826 | return drop; |
827 | } | |
828 | ||
829 | /* | |
830 | * rmdir and unlink are differ only by the metadata op code | |
831 | */ | |
832 | static int ceph_unlink(struct inode *dir, struct dentry *dentry) | |
833 | { | |
3d14c5d2 YS |
834 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
835 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
836 | struct inode *inode = dentry->d_inode; |
837 | struct ceph_mds_request *req; | |
838 | int err = -EROFS; | |
839 | int op; | |
840 | ||
841 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
842 | /* rmdir .snap/foo is RMSNAP */ | |
843 | dout("rmsnap dir %p '%.*s' dn %p\n", dir, dentry->d_name.len, | |
844 | dentry->d_name.name, dentry); | |
845 | op = CEPH_MDS_OP_RMSNAP; | |
846 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { | |
847 | dout("unlink/rmdir dir %p dn %p inode %p\n", | |
848 | dir, dentry, inode); | |
dba19c60 | 849 | op = S_ISDIR(dentry->d_inode->i_mode) ? |
2817b000 SW |
850 | CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK; |
851 | } else | |
852 | goto out; | |
853 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
854 | if (IS_ERR(req)) { | |
855 | err = PTR_ERR(req); | |
856 | goto out; | |
857 | } | |
858 | req->r_dentry = dget(dentry); | |
859 | req->r_num_caps = 2; | |
860 | req->r_locked_dir = dir; | |
861 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
862 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
863 | req->r_inode_drop = drop_caps_for_unlink(inode); | |
864 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
865 | if (!err && !req->r_reply_info.head->is_dentry) | |
866 | d_delete(dentry); | |
867 | ceph_mdsc_put_request(req); | |
868 | out: | |
869 | return err; | |
870 | } | |
871 | ||
872 | static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry, | |
873 | struct inode *new_dir, struct dentry *new_dentry) | |
874 | { | |
3d14c5d2 YS |
875 | struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb); |
876 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
877 | struct ceph_mds_request *req; |
878 | int err; | |
879 | ||
880 | if (ceph_snap(old_dir) != ceph_snap(new_dir)) | |
881 | return -EXDEV; | |
882 | if (ceph_snap(old_dir) != CEPH_NOSNAP || | |
883 | ceph_snap(new_dir) != CEPH_NOSNAP) | |
884 | return -EROFS; | |
885 | dout("rename dir %p dentry %p to dir %p dentry %p\n", | |
886 | old_dir, old_dentry, new_dir, new_dentry); | |
887 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RENAME, USE_AUTH_MDS); | |
888 | if (IS_ERR(req)) | |
889 | return PTR_ERR(req); | |
890 | req->r_dentry = dget(new_dentry); | |
891 | req->r_num_caps = 2; | |
892 | req->r_old_dentry = dget(old_dentry); | |
41b02e1f | 893 | req->r_old_dentry_dir = ceph_get_dentry_parent_inode(old_dentry); |
2817b000 SW |
894 | req->r_locked_dir = new_dir; |
895 | req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED; | |
896 | req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL; | |
897 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
898 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
899 | /* release LINK_RDCACHE on source inode (mds will lock it) */ | |
900 | req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; | |
901 | if (new_dentry->d_inode) | |
902 | req->r_inode_drop = drop_caps_for_unlink(new_dentry->d_inode); | |
903 | err = ceph_mdsc_do_request(mdsc, old_dir, req); | |
904 | if (!err && !req->r_reply_info.head->is_dentry) { | |
905 | /* | |
906 | * Normally d_move() is done by fill_trace (called by | |
907 | * do_request, above). If there is no trace, we need | |
908 | * to do it here. | |
909 | */ | |
ea1409f9 SW |
910 | |
911 | /* d_move screws up d_subdirs order */ | |
2f276c51 | 912 | ceph_dir_clear_complete(new_dir); |
ea1409f9 | 913 | |
2817b000 | 914 | d_move(old_dentry, new_dentry); |
ea1409f9 SW |
915 | |
916 | /* ensure target dentry is invalidated, despite | |
917 | rehashing bug in vfs_rename_dir */ | |
81a6cf2d | 918 | ceph_invalidate_dentry_lease(new_dentry); |
2817b000 SW |
919 | } |
920 | ceph_mdsc_put_request(req); | |
921 | return err; | |
922 | } | |
923 | ||
81a6cf2d SW |
924 | /* |
925 | * Ensure a dentry lease will no longer revalidate. | |
926 | */ | |
927 | void ceph_invalidate_dentry_lease(struct dentry *dentry) | |
928 | { | |
929 | spin_lock(&dentry->d_lock); | |
930 | dentry->d_time = jiffies; | |
931 | ceph_dentry(dentry)->lease_shared_gen = 0; | |
932 | spin_unlock(&dentry->d_lock); | |
933 | } | |
2817b000 SW |
934 | |
935 | /* | |
936 | * Check if dentry lease is valid. If not, delete the lease. Try to | |
937 | * renew if the least is more than half up. | |
938 | */ | |
939 | static int dentry_lease_is_valid(struct dentry *dentry) | |
940 | { | |
941 | struct ceph_dentry_info *di; | |
942 | struct ceph_mds_session *s; | |
943 | int valid = 0; | |
944 | u32 gen; | |
945 | unsigned long ttl; | |
946 | struct ceph_mds_session *session = NULL; | |
947 | struct inode *dir = NULL; | |
948 | u32 seq = 0; | |
949 | ||
950 | spin_lock(&dentry->d_lock); | |
951 | di = ceph_dentry(dentry); | |
3d8eb7a9 | 952 | if (di->lease_session) { |
2817b000 | 953 | s = di->lease_session; |
d8fb02ab | 954 | spin_lock(&s->s_gen_ttl_lock); |
2817b000 SW |
955 | gen = s->s_cap_gen; |
956 | ttl = s->s_cap_ttl; | |
d8fb02ab | 957 | spin_unlock(&s->s_gen_ttl_lock); |
2817b000 SW |
958 | |
959 | if (di->lease_gen == gen && | |
960 | time_before(jiffies, dentry->d_time) && | |
961 | time_before(jiffies, ttl)) { | |
962 | valid = 1; | |
963 | if (di->lease_renew_after && | |
964 | time_after(jiffies, di->lease_renew_after)) { | |
965 | /* we should renew */ | |
966 | dir = dentry->d_parent->d_inode; | |
967 | session = ceph_get_mds_session(s); | |
968 | seq = di->lease_seq; | |
969 | di->lease_renew_after = 0; | |
970 | di->lease_renew_from = jiffies; | |
971 | } | |
2817b000 SW |
972 | } |
973 | } | |
974 | spin_unlock(&dentry->d_lock); | |
975 | ||
976 | if (session) { | |
977 | ceph_mdsc_lease_send_msg(session, dir, dentry, | |
978 | CEPH_MDS_LEASE_RENEW, seq); | |
979 | ceph_put_mds_session(session); | |
980 | } | |
981 | dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid); | |
982 | return valid; | |
983 | } | |
984 | ||
985 | /* | |
986 | * Check if directory-wide content lease/cap is valid. | |
987 | */ | |
988 | static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry) | |
989 | { | |
990 | struct ceph_inode_info *ci = ceph_inode(dir); | |
991 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
992 | int valid = 0; | |
993 | ||
be655596 | 994 | spin_lock(&ci->i_ceph_lock); |
2817b000 SW |
995 | if (ci->i_shared_gen == di->lease_shared_gen) |
996 | valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1); | |
be655596 | 997 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
998 | dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n", |
999 | dir, (unsigned)ci->i_shared_gen, dentry, | |
1000 | (unsigned)di->lease_shared_gen, valid); | |
1001 | return valid; | |
1002 | } | |
1003 | ||
1004 | /* | |
1005 | * Check if cached dentry can be trusted. | |
1006 | */ | |
0b728e19 | 1007 | static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags) |
2817b000 | 1008 | { |
bf1c6aca | 1009 | int valid = 0; |
34286d66 NP |
1010 | struct inode *dir; |
1011 | ||
0b728e19 | 1012 | if (flags & LOOKUP_RCU) |
34286d66 NP |
1013 | return -ECHILD; |
1014 | ||
1cd3935b SW |
1015 | dout("d_revalidate %p '%.*s' inode %p offset %lld\n", dentry, |
1016 | dentry->d_name.len, dentry->d_name.name, dentry->d_inode, | |
1017 | ceph_dentry(dentry)->offset); | |
2817b000 | 1018 | |
bf1c6aca SW |
1019 | dir = ceph_get_dentry_parent_inode(dentry); |
1020 | ||
2817b000 SW |
1021 | /* always trust cached snapped dentries, snapdir dentry */ |
1022 | if (ceph_snap(dir) != CEPH_NOSNAP) { | |
1023 | dout("d_revalidate %p '%.*s' inode %p is SNAPPED\n", dentry, | |
1024 | dentry->d_name.len, dentry->d_name.name, dentry->d_inode); | |
bf1c6aca SW |
1025 | valid = 1; |
1026 | } else if (dentry->d_inode && | |
1027 | ceph_snap(dentry->d_inode) == CEPH_SNAPDIR) { | |
1028 | valid = 1; | |
1029 | } else if (dentry_lease_is_valid(dentry) || | |
1030 | dir_lease_is_valid(dir, dentry)) { | |
1031 | valid = 1; | |
2817b000 | 1032 | } |
2817b000 | 1033 | |
bf1c6aca SW |
1034 | dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid"); |
1035 | if (valid) | |
1036 | ceph_dentry_lru_touch(dentry); | |
1037 | else | |
1038 | d_drop(dentry); | |
1039 | iput(dir); | |
1040 | return valid; | |
2817b000 SW |
1041 | } |
1042 | ||
1043 | /* | |
147851d2 | 1044 | * Release our ceph_dentry_info. |
2817b000 | 1045 | */ |
147851d2 | 1046 | static void ceph_d_release(struct dentry *dentry) |
2817b000 SW |
1047 | { |
1048 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
2817b000 | 1049 | |
147851d2 | 1050 | dout("d_release %p\n", dentry); |
3d8eb7a9 SW |
1051 | ceph_dentry_lru_del(dentry); |
1052 | if (di->lease_session) | |
1053 | ceph_put_mds_session(di->lease_session); | |
1054 | kmem_cache_free(ceph_dentry_cachep, di); | |
1055 | dentry->d_fsdata = NULL; | |
2817b000 SW |
1056 | } |
1057 | ||
1058 | static int ceph_snapdir_d_revalidate(struct dentry *dentry, | |
0b728e19 | 1059 | unsigned int flags) |
2817b000 SW |
1060 | { |
1061 | /* | |
1062 | * Eventually, we'll want to revalidate snapped metadata | |
1063 | * too... probably... | |
1064 | */ | |
1065 | return 1; | |
1066 | } | |
1067 | ||
b58dc410 SW |
1068 | /* |
1069 | * When the VFS prunes a dentry from the cache, we need to clear the | |
1070 | * complete flag on the parent directory. | |
1071 | * | |
1072 | * Called under dentry->d_lock. | |
1073 | */ | |
1074 | static void ceph_d_prune(struct dentry *dentry) | |
1075 | { | |
774ac21d | 1076 | dout("ceph_d_prune %p\n", dentry); |
b58dc410 SW |
1077 | |
1078 | /* do we have a valid parent? */ | |
8842b3be | 1079 | if (IS_ROOT(dentry)) |
b58dc410 SW |
1080 | return; |
1081 | ||
2f276c51 | 1082 | /* if we are not hashed, we don't affect dir's completeness */ |
b58dc410 SW |
1083 | if (d_unhashed(dentry)) |
1084 | return; | |
2817b000 | 1085 | |
b58dc410 SW |
1086 | /* |
1087 | * we hold d_lock, so d_parent is stable, and d_fsdata is never | |
1088 | * cleared until d_release | |
1089 | */ | |
2f276c51 | 1090 | ceph_dir_clear_complete(dentry->d_parent->d_inode); |
b58dc410 | 1091 | } |
2817b000 SW |
1092 | |
1093 | /* | |
1094 | * read() on a dir. This weird interface hack only works if mounted | |
1095 | * with '-o dirstat'. | |
1096 | */ | |
1097 | static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, | |
1098 | loff_t *ppos) | |
1099 | { | |
1100 | struct ceph_file_info *cf = file->private_data; | |
496ad9aa | 1101 | struct inode *inode = file_inode(file); |
2817b000 SW |
1102 | struct ceph_inode_info *ci = ceph_inode(inode); |
1103 | int left; | |
ae598083 | 1104 | const int bufsize = 1024; |
2817b000 | 1105 | |
3d14c5d2 | 1106 | if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT)) |
2817b000 SW |
1107 | return -EISDIR; |
1108 | ||
1109 | if (!cf->dir_info) { | |
ae598083 | 1110 | cf->dir_info = kmalloc(bufsize, GFP_NOFS); |
2817b000 SW |
1111 | if (!cf->dir_info) |
1112 | return -ENOMEM; | |
1113 | cf->dir_info_len = | |
ae598083 | 1114 | snprintf(cf->dir_info, bufsize, |
2817b000 SW |
1115 | "entries: %20lld\n" |
1116 | " files: %20lld\n" | |
1117 | " subdirs: %20lld\n" | |
1118 | "rentries: %20lld\n" | |
1119 | " rfiles: %20lld\n" | |
1120 | " rsubdirs: %20lld\n" | |
1121 | "rbytes: %20lld\n" | |
1122 | "rctime: %10ld.%09ld\n", | |
1123 | ci->i_files + ci->i_subdirs, | |
1124 | ci->i_files, | |
1125 | ci->i_subdirs, | |
1126 | ci->i_rfiles + ci->i_rsubdirs, | |
1127 | ci->i_rfiles, | |
1128 | ci->i_rsubdirs, | |
1129 | ci->i_rbytes, | |
1130 | (long)ci->i_rctime.tv_sec, | |
1131 | (long)ci->i_rctime.tv_nsec); | |
1132 | } | |
1133 | ||
1134 | if (*ppos >= cf->dir_info_len) | |
1135 | return 0; | |
1136 | size = min_t(unsigned, size, cf->dir_info_len-*ppos); | |
1137 | left = copy_to_user(buf, cf->dir_info + *ppos, size); | |
1138 | if (left == size) | |
1139 | return -EFAULT; | |
1140 | *ppos += (size - left); | |
1141 | return size - left; | |
1142 | } | |
1143 | ||
1144 | /* | |
1145 | * an fsync() on a dir will wait for any uncommitted directory | |
1146 | * operations to commit. | |
1147 | */ | |
02c24a82 JB |
1148 | static int ceph_dir_fsync(struct file *file, loff_t start, loff_t end, |
1149 | int datasync) | |
2817b000 | 1150 | { |
496ad9aa | 1151 | struct inode *inode = file_inode(file); |
2817b000 SW |
1152 | struct ceph_inode_info *ci = ceph_inode(inode); |
1153 | struct list_head *head = &ci->i_unsafe_dirops; | |
1154 | struct ceph_mds_request *req; | |
1155 | u64 last_tid; | |
1156 | int ret = 0; | |
1157 | ||
1158 | dout("dir_fsync %p\n", inode); | |
02c24a82 JB |
1159 | ret = filemap_write_and_wait_range(inode->i_mapping, start, end); |
1160 | if (ret) | |
1161 | return ret; | |
1162 | mutex_lock(&inode->i_mutex); | |
1163 | ||
2817b000 SW |
1164 | spin_lock(&ci->i_unsafe_lock); |
1165 | if (list_empty(head)) | |
1166 | goto out; | |
1167 | ||
1168 | req = list_entry(head->prev, | |
1169 | struct ceph_mds_request, r_unsafe_dir_item); | |
1170 | last_tid = req->r_tid; | |
1171 | ||
1172 | do { | |
1173 | ceph_mdsc_get_request(req); | |
1174 | spin_unlock(&ci->i_unsafe_lock); | |
2ff179e6 | 1175 | |
2817b000 SW |
1176 | dout("dir_fsync %p wait on tid %llu (until %llu)\n", |
1177 | inode, req->r_tid, last_tid); | |
1178 | if (req->r_timeout) { | |
1179 | ret = wait_for_completion_timeout( | |
1180 | &req->r_safe_completion, req->r_timeout); | |
1181 | if (ret > 0) | |
1182 | ret = 0; | |
1183 | else if (ret == 0) | |
1184 | ret = -EIO; /* timed out */ | |
1185 | } else { | |
1186 | wait_for_completion(&req->r_safe_completion); | |
1187 | } | |
2817b000 SW |
1188 | ceph_mdsc_put_request(req); |
1189 | ||
2ff179e6 | 1190 | spin_lock(&ci->i_unsafe_lock); |
2817b000 SW |
1191 | if (ret || list_empty(head)) |
1192 | break; | |
1193 | req = list_entry(head->next, | |
1194 | struct ceph_mds_request, r_unsafe_dir_item); | |
1195 | } while (req->r_tid < last_tid); | |
1196 | out: | |
1197 | spin_unlock(&ci->i_unsafe_lock); | |
02c24a82 JB |
1198 | mutex_unlock(&inode->i_mutex); |
1199 | ||
2817b000 SW |
1200 | return ret; |
1201 | } | |
1202 | ||
1203 | /* | |
1204 | * We maintain a private dentry LRU. | |
1205 | * | |
1206 | * FIXME: this needs to be changed to a per-mds lru to be useful. | |
1207 | */ | |
1208 | void ceph_dentry_lru_add(struct dentry *dn) | |
1209 | { | |
1210 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1211 | struct ceph_mds_client *mdsc; | |
2817b000 | 1212 | |
04a419f9 SW |
1213 | dout("dentry_lru_add %p %p '%.*s'\n", di, dn, |
1214 | dn->d_name.len, dn->d_name.name); | |
3d8eb7a9 SW |
1215 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
1216 | spin_lock(&mdsc->dentry_lru_lock); | |
1217 | list_add_tail(&di->lru, &mdsc->dentry_lru); | |
1218 | mdsc->num_dentry++; | |
1219 | spin_unlock(&mdsc->dentry_lru_lock); | |
2817b000 SW |
1220 | } |
1221 | ||
1222 | void ceph_dentry_lru_touch(struct dentry *dn) | |
1223 | { | |
1224 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1225 | struct ceph_mds_client *mdsc; | |
2817b000 | 1226 | |
1cd3935b SW |
1227 | dout("dentry_lru_touch %p %p '%.*s' (offset %lld)\n", di, dn, |
1228 | dn->d_name.len, dn->d_name.name, di->offset); | |
3d8eb7a9 SW |
1229 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
1230 | spin_lock(&mdsc->dentry_lru_lock); | |
1231 | list_move_tail(&di->lru, &mdsc->dentry_lru); | |
1232 | spin_unlock(&mdsc->dentry_lru_lock); | |
2817b000 SW |
1233 | } |
1234 | ||
1235 | void ceph_dentry_lru_del(struct dentry *dn) | |
1236 | { | |
1237 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1238 | struct ceph_mds_client *mdsc; | |
1239 | ||
04a419f9 SW |
1240 | dout("dentry_lru_del %p %p '%.*s'\n", di, dn, |
1241 | dn->d_name.len, dn->d_name.name); | |
3d8eb7a9 SW |
1242 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
1243 | spin_lock(&mdsc->dentry_lru_lock); | |
1244 | list_del_init(&di->lru); | |
1245 | mdsc->num_dentry--; | |
1246 | spin_unlock(&mdsc->dentry_lru_lock); | |
2817b000 SW |
1247 | } |
1248 | ||
6c0f3af7 SW |
1249 | /* |
1250 | * Return name hash for a given dentry. This is dependent on | |
1251 | * the parent directory's hash function. | |
1252 | */ | |
e5f86dc3 | 1253 | unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn) |
6c0f3af7 | 1254 | { |
6c0f3af7 SW |
1255 | struct ceph_inode_info *dci = ceph_inode(dir); |
1256 | ||
1257 | switch (dci->i_dir_layout.dl_dir_hash) { | |
1258 | case 0: /* for backward compat */ | |
1259 | case CEPH_STR_HASH_LINUX: | |
1260 | return dn->d_name.hash; | |
1261 | ||
1262 | default: | |
1263 | return ceph_str_hash(dci->i_dir_layout.dl_dir_hash, | |
1264 | dn->d_name.name, dn->d_name.len); | |
1265 | } | |
1266 | } | |
1267 | ||
2817b000 SW |
1268 | const struct file_operations ceph_dir_fops = { |
1269 | .read = ceph_read_dir, | |
77acfa29 | 1270 | .iterate = ceph_readdir, |
2817b000 SW |
1271 | .llseek = ceph_dir_llseek, |
1272 | .open = ceph_open, | |
1273 | .release = ceph_release, | |
1274 | .unlocked_ioctl = ceph_ioctl, | |
1275 | .fsync = ceph_dir_fsync, | |
1276 | }; | |
1277 | ||
1278 | const struct inode_operations ceph_dir_iops = { | |
1279 | .lookup = ceph_lookup, | |
1280 | .permission = ceph_permission, | |
1281 | .getattr = ceph_getattr, | |
1282 | .setattr = ceph_setattr, | |
1283 | .setxattr = ceph_setxattr, | |
1284 | .getxattr = ceph_getxattr, | |
1285 | .listxattr = ceph_listxattr, | |
1286 | .removexattr = ceph_removexattr, | |
1287 | .mknod = ceph_mknod, | |
1288 | .symlink = ceph_symlink, | |
1289 | .mkdir = ceph_mkdir, | |
1290 | .link = ceph_link, | |
1291 | .unlink = ceph_unlink, | |
1292 | .rmdir = ceph_unlink, | |
1293 | .rename = ceph_rename, | |
1294 | .create = ceph_create, | |
2d83bde9 | 1295 | .atomic_open = ceph_atomic_open, |
2817b000 SW |
1296 | }; |
1297 | ||
52dfb8ac | 1298 | const struct dentry_operations ceph_dentry_ops = { |
2817b000 | 1299 | .d_revalidate = ceph_d_revalidate, |
147851d2 | 1300 | .d_release = ceph_d_release, |
b58dc410 | 1301 | .d_prune = ceph_d_prune, |
2817b000 SW |
1302 | }; |
1303 | ||
52dfb8ac | 1304 | const struct dentry_operations ceph_snapdir_dentry_ops = { |
2817b000 | 1305 | .d_revalidate = ceph_snapdir_d_revalidate, |
147851d2 | 1306 | .d_release = ceph_d_release, |
2817b000 SW |
1307 | }; |
1308 | ||
52dfb8ac | 1309 | const struct dentry_operations ceph_snap_dentry_ops = { |
147851d2 | 1310 | .d_release = ceph_d_release, |
b58dc410 | 1311 | .d_prune = ceph_d_prune, |
2817b000 | 1312 | }; |