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Commit | Line | Data |
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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 | ||
52dfb8ac | 29 | const struct dentry_operations ceph_dentry_ops; |
2817b000 SW |
30 | |
31 | /* | |
32 | * Initialize ceph dentry state. | |
33 | */ | |
34 | int ceph_init_dentry(struct dentry *dentry) | |
35 | { | |
36 | struct ceph_dentry_info *di; | |
37 | ||
38 | if (dentry->d_fsdata) | |
39 | return 0; | |
40 | ||
36e21687 | 41 | di = kmem_cache_alloc(ceph_dentry_cachep, GFP_NOFS | __GFP_ZERO); |
2817b000 SW |
42 | if (!di) |
43 | return -ENOMEM; /* oh well */ | |
44 | ||
45 | spin_lock(&dentry->d_lock); | |
8c6efb58 SW |
46 | if (dentry->d_fsdata) { |
47 | /* lost a race */ | |
48 | kmem_cache_free(ceph_dentry_cachep, di); | |
2817b000 | 49 | goto out_unlock; |
8c6efb58 | 50 | } |
48d0cbd1 | 51 | |
8842b3be | 52 | if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) |
48d0cbd1 SW |
53 | d_set_d_op(dentry, &ceph_dentry_ops); |
54 | else if (ceph_snap(dentry->d_parent->d_inode) == CEPH_SNAPDIR) | |
55 | d_set_d_op(dentry, &ceph_snapdir_dentry_ops); | |
56 | else | |
57 | d_set_d_op(dentry, &ceph_snap_dentry_ops); | |
58 | ||
2817b000 SW |
59 | di->dentry = dentry; |
60 | di->lease_session = NULL; | |
2817b000 | 61 | dentry->d_time = jiffies; |
48d0cbd1 SW |
62 | /* avoid reordering d_fsdata setup so that the check above is safe */ |
63 | smp_mb(); | |
64 | dentry->d_fsdata = di; | |
2817b000 SW |
65 | ceph_dentry_lru_add(dentry); |
66 | out_unlock: | |
67 | spin_unlock(&dentry->d_lock); | |
68 | return 0; | |
69 | } | |
70 | ||
5f21c96d SW |
71 | struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry) |
72 | { | |
73 | struct inode *inode = NULL; | |
74 | ||
75 | if (!dentry) | |
76 | return NULL; | |
77 | ||
78 | spin_lock(&dentry->d_lock); | |
8842b3be | 79 | if (!IS_ROOT(dentry)) { |
5f21c96d SW |
80 | inode = dentry->d_parent->d_inode; |
81 | ihold(inode); | |
82 | } | |
83 | spin_unlock(&dentry->d_lock); | |
84 | return inode; | |
85 | } | |
2817b000 SW |
86 | |
87 | ||
88 | /* | |
89 | * for readdir, we encode the directory frag and offset within that | |
90 | * frag into f_pos. | |
91 | */ | |
92 | static unsigned fpos_frag(loff_t p) | |
93 | { | |
94 | return p >> 32; | |
95 | } | |
96 | static unsigned fpos_off(loff_t p) | |
97 | { | |
98 | return p & 0xffffffff; | |
99 | } | |
100 | ||
4d5f5df6 YZ |
101 | static int fpos_cmp(loff_t l, loff_t r) |
102 | { | |
103 | int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r)); | |
104 | if (v) | |
105 | return v; | |
106 | return (int)(fpos_off(l) - fpos_off(r)); | |
107 | } | |
108 | ||
2817b000 SW |
109 | /* |
110 | * When possible, we try to satisfy a readdir by peeking at the | |
111 | * dcache. We make this work by carefully ordering dentries on | |
946e51f2 | 112 | * d_child when we initially get results back from the MDS, and |
2817b000 SW |
113 | * falling back to a "normal" sync readdir if any dentries in the dir |
114 | * are dropped. | |
115 | * | |
2f276c51 | 116 | * Complete dir indicates that we have all dentries in the dir. It is |
2817b000 SW |
117 | * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by |
118 | * the MDS if/when the directory is modified). | |
119 | */ | |
a30be7cb YZ |
120 | static int __dcache_readdir(struct file *file, struct dir_context *ctx, |
121 | u32 shared_gen) | |
2817b000 | 122 | { |
77acfa29 | 123 | struct ceph_file_info *fi = file->private_data; |
b583043e | 124 | struct dentry *parent = file->f_path.dentry; |
2817b000 SW |
125 | struct inode *dir = parent->d_inode; |
126 | struct list_head *p; | |
127 | struct dentry *dentry, *last; | |
128 | struct ceph_dentry_info *di; | |
129 | int err = 0; | |
130 | ||
131 | /* claim ref on last dentry we returned */ | |
132 | last = fi->dentry; | |
133 | fi->dentry = NULL; | |
134 | ||
a30be7cb YZ |
135 | dout("__dcache_readdir %p v%u at %llu (last %p)\n", |
136 | dir, shared_gen, ctx->pos, last); | |
2817b000 | 137 | |
2fd6b7f5 | 138 | spin_lock(&parent->d_lock); |
2817b000 SW |
139 | |
140 | /* start at beginning? */ | |
77acfa29 | 141 | if (ctx->pos == 2 || last == NULL || |
6da5246d | 142 | fpos_cmp(ctx->pos, ceph_dentry(last)->offset) < 0) { |
2817b000 SW |
143 | if (list_empty(&parent->d_subdirs)) |
144 | goto out_unlock; | |
145 | p = parent->d_subdirs.prev; | |
146 | dout(" initial p %p/%p\n", p->prev, p->next); | |
147 | } else { | |
946e51f2 | 148 | p = last->d_child.prev; |
2817b000 SW |
149 | } |
150 | ||
151 | more: | |
946e51f2 | 152 | dentry = list_entry(p, struct dentry, d_child); |
2817b000 SW |
153 | di = ceph_dentry(dentry); |
154 | while (1) { | |
1cd3935b SW |
155 | dout(" p %p/%p %s d_subdirs %p/%p\n", p->prev, p->next, |
156 | d_unhashed(dentry) ? "!hashed" : "hashed", | |
2817b000 SW |
157 | parent->d_subdirs.prev, parent->d_subdirs.next); |
158 | if (p == &parent->d_subdirs) { | |
9cfa1098 | 159 | fi->flags |= CEPH_F_ATEND; |
2817b000 SW |
160 | goto out_unlock; |
161 | } | |
2fd6b7f5 | 162 | spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED); |
a30be7cb YZ |
163 | if (di->lease_shared_gen == shared_gen && |
164 | !d_unhashed(dentry) && dentry->d_inode && | |
09b8a7d2 | 165 | ceph_snap(dentry->d_inode) != CEPH_SNAPDIR && |
1d1de916 | 166 | ceph_ino(dentry->d_inode) != CEPH_INO_CEPH && |
4d5f5df6 | 167 | fpos_cmp(ctx->pos, di->offset) <= 0) |
2817b000 | 168 | break; |
a455589f AV |
169 | dout(" skipping %p %pd at %llu (%llu)%s%s\n", dentry, |
170 | dentry, di->offset, | |
77acfa29 | 171 | ctx->pos, d_unhashed(dentry) ? " unhashed" : "", |
2817b000 | 172 | !dentry->d_inode ? " null" : ""); |
da502956 | 173 | spin_unlock(&dentry->d_lock); |
2817b000 | 174 | p = p->prev; |
946e51f2 | 175 | dentry = list_entry(p, struct dentry, d_child); |
2817b000 SW |
176 | di = ceph_dentry(dentry); |
177 | } | |
178 | ||
da502956 | 179 | dget_dlock(dentry); |
b7ab39f6 | 180 | spin_unlock(&dentry->d_lock); |
2fd6b7f5 | 181 | spin_unlock(&parent->d_lock); |
2817b000 | 182 | |
0081bd83 | 183 | /* make sure a dentry wasn't dropped while we didn't have parent lock */ |
70db4f36 | 184 | if (!ceph_dir_is_complete_ordered(dir)) { |
0081bd83 YZ |
185 | dout(" lost dir complete on %p; falling back to mds\n", dir); |
186 | dput(dentry); | |
187 | err = -EAGAIN; | |
188 | goto out; | |
189 | } | |
190 | ||
a455589f AV |
191 | dout(" %llu (%llu) dentry %p %pd %p\n", di->offset, ctx->pos, |
192 | dentry, dentry, dentry->d_inode); | |
77acfa29 AV |
193 | if (!dir_emit(ctx, dentry->d_name.name, |
194 | dentry->d_name.len, | |
ad1fee96 | 195 | ceph_translate_ino(dentry->d_sb, dentry->d_inode->i_ino), |
77acfa29 AV |
196 | dentry->d_inode->i_mode >> 12)) { |
197 | if (last) { | |
2817b000 SW |
198 | /* remember our position */ |
199 | fi->dentry = last; | |
f0494206 | 200 | fi->next_offset = fpos_off(di->offset); |
2817b000 | 201 | } |
77acfa29 AV |
202 | dput(dentry); |
203 | return 0; | |
2817b000 | 204 | } |
f5b06628 | 205 | |
0081bd83 YZ |
206 | ctx->pos = di->offset + 1; |
207 | ||
77acfa29 AV |
208 | if (last) |
209 | dput(last); | |
210 | last = dentry; | |
2817b000 | 211 | |
2fd6b7f5 | 212 | spin_lock(&parent->d_lock); |
efa4c120 SW |
213 | p = p->prev; /* advance to next dentry */ |
214 | goto more; | |
2817b000 SW |
215 | |
216 | out_unlock: | |
2fd6b7f5 | 217 | spin_unlock(&parent->d_lock); |
efa4c120 SW |
218 | out: |
219 | if (last) | |
2817b000 | 220 | dput(last); |
2817b000 SW |
221 | return err; |
222 | } | |
223 | ||
224 | /* | |
225 | * make note of the last dentry we read, so we can | |
226 | * continue at the same lexicographical point, | |
227 | * regardless of what dir changes take place on the | |
228 | * server. | |
229 | */ | |
230 | static int note_last_dentry(struct ceph_file_info *fi, const char *name, | |
231 | int len) | |
232 | { | |
233 | kfree(fi->last_name); | |
234 | fi->last_name = kmalloc(len+1, GFP_NOFS); | |
235 | if (!fi->last_name) | |
236 | return -ENOMEM; | |
237 | memcpy(fi->last_name, name, len); | |
238 | fi->last_name[len] = 0; | |
239 | dout("note_last_dentry '%s'\n", fi->last_name); | |
240 | return 0; | |
241 | } | |
242 | ||
77acfa29 | 243 | static int ceph_readdir(struct file *file, struct dir_context *ctx) |
2817b000 | 244 | { |
77acfa29 AV |
245 | struct ceph_file_info *fi = file->private_data; |
246 | struct inode *inode = file_inode(file); | |
2817b000 | 247 | struct ceph_inode_info *ci = ceph_inode(inode); |
3d14c5d2 YS |
248 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
249 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
77acfa29 AV |
250 | unsigned frag = fpos_frag(ctx->pos); |
251 | int off = fpos_off(ctx->pos); | |
2817b000 SW |
252 | int err; |
253 | u32 ftype; | |
254 | struct ceph_mds_reply_info_parsed *rinfo; | |
2817b000 | 255 | |
77acfa29 | 256 | dout("readdir %p file %p frag %u off %u\n", inode, file, frag, off); |
9cfa1098 | 257 | if (fi->flags & CEPH_F_ATEND) |
2817b000 SW |
258 | return 0; |
259 | ||
260 | /* always start with . and .. */ | |
77acfa29 | 261 | if (ctx->pos == 0) { |
2817b000 | 262 | dout("readdir off 0 -> '.'\n"); |
77acfa29 | 263 | if (!dir_emit(ctx, ".", 1, |
ad1fee96 | 264 | ceph_translate_ino(inode->i_sb, inode->i_ino), |
77acfa29 | 265 | inode->i_mode >> 12)) |
2817b000 | 266 | return 0; |
77acfa29 | 267 | ctx->pos = 1; |
2817b000 SW |
268 | off = 1; |
269 | } | |
77acfa29 | 270 | if (ctx->pos == 1) { |
b583043e | 271 | ino_t ino = parent_ino(file->f_path.dentry); |
2817b000 | 272 | dout("readdir off 1 -> '..'\n"); |
77acfa29 | 273 | if (!dir_emit(ctx, "..", 2, |
ad1fee96 | 274 | ceph_translate_ino(inode->i_sb, ino), |
77acfa29 | 275 | inode->i_mode >> 12)) |
2817b000 | 276 | return 0; |
77acfa29 | 277 | ctx->pos = 2; |
2817b000 SW |
278 | off = 2; |
279 | } | |
280 | ||
281 | /* can we use the dcache? */ | |
be655596 | 282 | spin_lock(&ci->i_ceph_lock); |
77acfa29 | 283 | if ((ctx->pos == 2 || fi->dentry) && |
3d14c5d2 | 284 | !ceph_test_mount_opt(fsc, NOASYNCREADDIR) && |
a0dff78d | 285 | ceph_snap(inode) != CEPH_SNAPDIR && |
70db4f36 | 286 | __ceph_dir_is_complete_ordered(ci) && |
2817b000 | 287 | __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) { |
a30be7cb | 288 | u32 shared_gen = ci->i_shared_gen; |
be655596 | 289 | spin_unlock(&ci->i_ceph_lock); |
a30be7cb | 290 | err = __dcache_readdir(file, ctx, shared_gen); |
efa4c120 | 291 | if (err != -EAGAIN) |
2817b000 | 292 | return err; |
0081bd83 YZ |
293 | frag = fpos_frag(ctx->pos); |
294 | off = fpos_off(ctx->pos); | |
efa4c120 | 295 | } else { |
be655596 | 296 | spin_unlock(&ci->i_ceph_lock); |
2817b000 | 297 | } |
2817b000 SW |
298 | if (fi->dentry) { |
299 | err = note_last_dentry(fi, fi->dentry->d_name.name, | |
300 | fi->dentry->d_name.len); | |
301 | if (err) | |
302 | return err; | |
303 | dput(fi->dentry); | |
304 | fi->dentry = NULL; | |
305 | } | |
306 | ||
307 | /* proceed with a normal readdir */ | |
308 | ||
70db4f36 YZ |
309 | if (ctx->pos == 2) { |
310 | /* note dir version at start of readdir so we can tell | |
311 | * if any dentries get dropped */ | |
312 | fi->dir_release_count = atomic_read(&ci->i_release_count); | |
313 | fi->dir_ordered_count = ci->i_ordered_count; | |
314 | } | |
315 | ||
2817b000 SW |
316 | more: |
317 | /* do we have the correct frag content buffered? */ | |
318 | if (fi->frag != frag || fi->last_readdir == NULL) { | |
319 | struct ceph_mds_request *req; | |
320 | int op = ceph_snap(inode) == CEPH_SNAPDIR ? | |
321 | CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR; | |
322 | ||
323 | /* discard old result, if any */ | |
393f6620 | 324 | if (fi->last_readdir) { |
2817b000 | 325 | ceph_mdsc_put_request(fi->last_readdir); |
393f6620 SW |
326 | fi->last_readdir = NULL; |
327 | } | |
2817b000 | 328 | |
2817b000 SW |
329 | dout("readdir fetching %llx.%llx frag %x offset '%s'\n", |
330 | ceph_vinop(inode), frag, fi->last_name); | |
331 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
332 | if (IS_ERR(req)) | |
333 | return PTR_ERR(req); | |
54008399 YZ |
334 | err = ceph_alloc_readdir_reply_buffer(req, inode); |
335 | if (err) { | |
336 | ceph_mdsc_put_request(req); | |
337 | return err; | |
338 | } | |
70b666c3 SW |
339 | req->r_inode = inode; |
340 | ihold(inode); | |
b583043e | 341 | req->r_dentry = dget(file->f_path.dentry); |
2817b000 SW |
342 | /* hints to request -> mds selection code */ |
343 | req->r_direct_mode = USE_AUTH_MDS; | |
344 | req->r_direct_hash = ceph_frag_value(frag); | |
345 | req->r_direct_is_hash = true; | |
346 | req->r_path2 = kstrdup(fi->last_name, GFP_NOFS); | |
347 | req->r_readdir_offset = fi->next_offset; | |
348 | req->r_args.readdir.frag = cpu_to_le32(frag); | |
2817b000 SW |
349 | err = ceph_mdsc_do_request(mdsc, NULL, req); |
350 | if (err < 0) { | |
351 | ceph_mdsc_put_request(req); | |
352 | return err; | |
353 | } | |
354 | dout("readdir got and parsed readdir result=%d" | |
355 | " on frag %x, end=%d, complete=%d\n", err, frag, | |
356 | (int)req->r_reply_info.dir_end, | |
357 | (int)req->r_reply_info.dir_complete); | |
358 | ||
359 | if (!req->r_did_prepopulate) { | |
360 | dout("readdir !did_prepopulate"); | |
2f276c51 YZ |
361 | /* preclude from marking dir complete */ |
362 | fi->dir_release_count--; | |
2817b000 SW |
363 | } |
364 | ||
365 | /* note next offset and last dentry name */ | |
81c6aea5 YZ |
366 | rinfo = &req->r_reply_info; |
367 | if (le32_to_cpu(rinfo->dir_dir->frag) != frag) { | |
368 | frag = le32_to_cpu(rinfo->dir_dir->frag); | |
369 | if (ceph_frag_is_leftmost(frag)) | |
370 | fi->next_offset = 2; | |
371 | else | |
372 | fi->next_offset = 0; | |
373 | off = fi->next_offset; | |
374 | } | |
f0494206 | 375 | fi->frag = frag; |
2817b000 SW |
376 | fi->offset = fi->next_offset; |
377 | fi->last_readdir = req; | |
378 | ||
379 | if (req->r_reply_info.dir_end) { | |
380 | kfree(fi->last_name); | |
381 | fi->last_name = NULL; | |
7b88dadc SW |
382 | if (ceph_frag_is_rightmost(frag)) |
383 | fi->next_offset = 2; | |
384 | else | |
385 | fi->next_offset = 0; | |
2817b000 | 386 | } else { |
2817b000 SW |
387 | err = note_last_dentry(fi, |
388 | rinfo->dir_dname[rinfo->dir_nr-1], | |
389 | rinfo->dir_dname_len[rinfo->dir_nr-1]); | |
390 | if (err) | |
391 | return err; | |
392 | fi->next_offset += rinfo->dir_nr; | |
393 | } | |
394 | } | |
395 | ||
396 | rinfo = &fi->last_readdir->r_reply_info; | |
397 | dout("readdir frag %x num %d off %d chunkoff %d\n", frag, | |
398 | rinfo->dir_nr, off, fi->offset); | |
77acfa29 AV |
399 | |
400 | ctx->pos = ceph_make_fpos(frag, off); | |
da39822c | 401 | while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) { |
2817b000 SW |
402 | struct ceph_mds_reply_inode *in = |
403 | rinfo->dir_in[off - fi->offset].in; | |
3105c19c SW |
404 | struct ceph_vino vino; |
405 | ino_t ino; | |
406 | ||
2817b000 | 407 | dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n", |
77acfa29 | 408 | off, off - fi->offset, rinfo->dir_nr, ctx->pos, |
2817b000 SW |
409 | rinfo->dir_dname_len[off - fi->offset], |
410 | rinfo->dir_dname[off - fi->offset], in); | |
411 | BUG_ON(!in); | |
412 | ftype = le32_to_cpu(in->mode) >> 12; | |
3105c19c SW |
413 | vino.ino = le64_to_cpu(in->ino); |
414 | vino.snap = le64_to_cpu(in->snapid); | |
415 | ino = ceph_vino_to_ino(vino); | |
77acfa29 | 416 | if (!dir_emit(ctx, |
2817b000 SW |
417 | rinfo->dir_dname[off - fi->offset], |
418 | rinfo->dir_dname_len[off - fi->offset], | |
77acfa29 | 419 | ceph_translate_ino(inode->i_sb, ino), ftype)) { |
2817b000 SW |
420 | dout("filldir stopping us...\n"); |
421 | return 0; | |
422 | } | |
423 | off++; | |
77acfa29 | 424 | ctx->pos++; |
2817b000 SW |
425 | } |
426 | ||
427 | if (fi->last_name) { | |
428 | ceph_mdsc_put_request(fi->last_readdir); | |
429 | fi->last_readdir = NULL; | |
430 | goto more; | |
431 | } | |
432 | ||
433 | /* more frags? */ | |
434 | if (!ceph_frag_is_rightmost(frag)) { | |
435 | frag = ceph_frag_next(frag); | |
436 | off = 0; | |
77acfa29 | 437 | ctx->pos = ceph_make_fpos(frag, off); |
2817b000 SW |
438 | dout("readdir next frag is %x\n", frag); |
439 | goto more; | |
440 | } | |
9cfa1098 | 441 | fi->flags |= CEPH_F_ATEND; |
2817b000 SW |
442 | |
443 | /* | |
444 | * if dir_release_count still matches the dir, no dentries | |
445 | * were released during the whole readdir, and we should have | |
446 | * the complete dir contents in our cache. | |
447 | */ | |
be655596 | 448 | spin_lock(&ci->i_ceph_lock); |
2f276c51 | 449 | if (atomic_read(&ci->i_release_count) == fi->dir_release_count) { |
70db4f36 YZ |
450 | if (ci->i_ordered_count == fi->dir_ordered_count) |
451 | dout(" marking %p complete and ordered\n", inode); | |
452 | else | |
453 | dout(" marking %p complete\n", inode); | |
454 | __ceph_dir_set_complete(ci, fi->dir_release_count, | |
455 | fi->dir_ordered_count); | |
2817b000 | 456 | } |
be655596 | 457 | spin_unlock(&ci->i_ceph_lock); |
2817b000 | 458 | |
77acfa29 | 459 | dout("readdir %p file %p done.\n", inode, file); |
2817b000 SW |
460 | return 0; |
461 | } | |
462 | ||
dcd3cc05 | 463 | static void reset_readdir(struct ceph_file_info *fi, unsigned frag) |
2817b000 SW |
464 | { |
465 | if (fi->last_readdir) { | |
466 | ceph_mdsc_put_request(fi->last_readdir); | |
467 | fi->last_readdir = NULL; | |
468 | } | |
469 | kfree(fi->last_name); | |
a1629c3b | 470 | fi->last_name = NULL; |
dcd3cc05 YZ |
471 | if (ceph_frag_is_leftmost(frag)) |
472 | fi->next_offset = 2; /* compensate for . and .. */ | |
473 | else | |
474 | fi->next_offset = 0; | |
2817b000 SW |
475 | if (fi->dentry) { |
476 | dput(fi->dentry); | |
477 | fi->dentry = NULL; | |
478 | } | |
9cfa1098 | 479 | fi->flags &= ~CEPH_F_ATEND; |
2817b000 SW |
480 | } |
481 | ||
965c8e59 | 482 | static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence) |
2817b000 SW |
483 | { |
484 | struct ceph_file_info *fi = file->private_data; | |
485 | struct inode *inode = file->f_mapping->host; | |
f0494206 | 486 | loff_t old_offset = ceph_make_fpos(fi->frag, fi->next_offset); |
2817b000 SW |
487 | loff_t retval; |
488 | ||
489 | mutex_lock(&inode->i_mutex); | |
06222e49 | 490 | retval = -EINVAL; |
965c8e59 | 491 | switch (whence) { |
2817b000 SW |
492 | case SEEK_END: |
493 | offset += inode->i_size + 2; /* FIXME */ | |
494 | break; | |
495 | case SEEK_CUR: | |
496 | offset += file->f_pos; | |
06222e49 JB |
497 | case SEEK_SET: |
498 | break; | |
499 | default: | |
500 | goto out; | |
2817b000 | 501 | } |
06222e49 | 502 | |
f0494206 | 503 | if (offset >= 0) { |
2817b000 SW |
504 | if (offset != file->f_pos) { |
505 | file->f_pos = offset; | |
506 | file->f_version = 0; | |
9cfa1098 | 507 | fi->flags &= ~CEPH_F_ATEND; |
2817b000 SW |
508 | } |
509 | retval = offset; | |
510 | ||
511 | /* | |
512 | * discard buffered readdir content on seekdir(0), or | |
513 | * seek to new frag, or seek prior to current chunk. | |
514 | */ | |
515 | if (offset == 0 || | |
f0494206 | 516 | fpos_frag(offset) != fi->frag || |
2817b000 SW |
517 | fpos_off(offset) < fi->offset) { |
518 | dout("dir_llseek dropping %p content\n", file); | |
dcd3cc05 | 519 | reset_readdir(fi, fpos_frag(offset)); |
2817b000 SW |
520 | } |
521 | ||
522 | /* bump dir_release_count if we did a forward seek */ | |
f0494206 | 523 | if (fpos_cmp(offset, old_offset) > 0) |
2817b000 SW |
524 | fi->dir_release_count--; |
525 | } | |
06222e49 | 526 | out: |
2817b000 SW |
527 | mutex_unlock(&inode->i_mutex); |
528 | return retval; | |
529 | } | |
530 | ||
531 | /* | |
468640e3 | 532 | * Handle lookups for the hidden .snap directory. |
2817b000 | 533 | */ |
468640e3 SW |
534 | int ceph_handle_snapdir(struct ceph_mds_request *req, |
535 | struct dentry *dentry, int err) | |
2817b000 | 536 | { |
3d14c5d2 | 537 | struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); |
d79698da | 538 | struct inode *parent = dentry->d_parent->d_inode; /* we hold i_mutex */ |
2817b000 SW |
539 | |
540 | /* .snap dir? */ | |
541 | if (err == -ENOENT && | |
455cec0a | 542 | ceph_snap(parent) == CEPH_NOSNAP && |
6b805185 | 543 | strcmp(dentry->d_name.name, |
3d14c5d2 | 544 | fsc->mount_options->snapdir_name) == 0) { |
2817b000 | 545 | struct inode *inode = ceph_get_snapdir(parent); |
a455589f AV |
546 | dout("ENOENT on snapdir %p '%pd', linking to snapdir %p\n", |
547 | dentry, dentry, inode); | |
9358c6d4 | 548 | BUG_ON(!d_unhashed(dentry)); |
2817b000 SW |
549 | d_add(dentry, inode); |
550 | err = 0; | |
551 | } | |
468640e3 SW |
552 | return err; |
553 | } | |
2817b000 | 554 | |
468640e3 SW |
555 | /* |
556 | * Figure out final result of a lookup/open request. | |
557 | * | |
558 | * Mainly, make sure we return the final req->r_dentry (if it already | |
559 | * existed) in place of the original VFS-provided dentry when they | |
560 | * differ. | |
561 | * | |
562 | * Gracefully handle the case where the MDS replies with -ENOENT and | |
563 | * no trace (which it may do, at its discretion, e.g., if it doesn't | |
564 | * care to issue a lease on the negative dentry). | |
565 | */ | |
566 | struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, | |
567 | struct dentry *dentry, int err) | |
568 | { | |
2817b000 SW |
569 | if (err == -ENOENT) { |
570 | /* no trace? */ | |
571 | err = 0; | |
572 | if (!req->r_reply_info.head->is_dentry) { | |
573 | dout("ENOENT and no trace, dentry %p inode %p\n", | |
574 | dentry, dentry->d_inode); | |
575 | if (dentry->d_inode) { | |
576 | d_drop(dentry); | |
577 | err = -ENOENT; | |
578 | } else { | |
579 | d_add(dentry, NULL); | |
580 | } | |
581 | } | |
582 | } | |
583 | if (err) | |
584 | dentry = ERR_PTR(err); | |
585 | else if (dentry != req->r_dentry) | |
586 | dentry = dget(req->r_dentry); /* we got spliced */ | |
587 | else | |
588 | dentry = NULL; | |
589 | return dentry; | |
590 | } | |
591 | ||
1d1de916 SW |
592 | static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry) |
593 | { | |
594 | return ceph_ino(inode) == CEPH_INO_ROOT && | |
595 | strncmp(dentry->d_name.name, ".ceph", 5) == 0; | |
596 | } | |
597 | ||
2817b000 SW |
598 | /* |
599 | * Look up a single dir entry. If there is a lookup intent, inform | |
600 | * the MDS so that it gets our 'caps wanted' value in a single op. | |
601 | */ | |
602 | static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry, | |
00cd8dd3 | 603 | unsigned int flags) |
2817b000 | 604 | { |
3d14c5d2 YS |
605 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
606 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
607 | struct ceph_mds_request *req; |
608 | int op; | |
609 | int err; | |
610 | ||
a455589f AV |
611 | dout("lookup %p dentry %p '%pd'\n", |
612 | dir, dentry, dentry); | |
2817b000 SW |
613 | |
614 | if (dentry->d_name.len > NAME_MAX) | |
615 | return ERR_PTR(-ENAMETOOLONG); | |
616 | ||
617 | err = ceph_init_dentry(dentry); | |
618 | if (err < 0) | |
619 | return ERR_PTR(err); | |
620 | ||
2817b000 SW |
621 | /* can we conclude ENOENT locally? */ |
622 | if (dentry->d_inode == NULL) { | |
623 | struct ceph_inode_info *ci = ceph_inode(dir); | |
624 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
625 | ||
be655596 | 626 | spin_lock(&ci->i_ceph_lock); |
2817b000 SW |
627 | dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags); |
628 | if (strncmp(dentry->d_name.name, | |
3d14c5d2 | 629 | fsc->mount_options->snapdir_name, |
2817b000 | 630 | dentry->d_name.len) && |
1d1de916 | 631 | !is_root_ceph_dentry(dir, dentry) && |
2f276c51 | 632 | __ceph_dir_is_complete(ci) && |
2817b000 | 633 | (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) { |
be655596 | 634 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
635 | dout(" dir %p complete, -ENOENT\n", dir); |
636 | d_add(dentry, NULL); | |
637 | di->lease_shared_gen = ci->i_shared_gen; | |
638 | return NULL; | |
639 | } | |
be655596 | 640 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
641 | } |
642 | ||
643 | op = ceph_snap(dir) == CEPH_SNAPDIR ? | |
644 | CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; | |
645 | req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); | |
646 | if (IS_ERR(req)) | |
7e34bc52 | 647 | return ERR_CAST(req); |
2817b000 SW |
648 | req->r_dentry = dget(dentry); |
649 | req->r_num_caps = 2; | |
650 | /* we only need inode linkage */ | |
651 | req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); | |
652 | req->r_locked_dir = dir; | |
653 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
468640e3 | 654 | err = ceph_handle_snapdir(req, dentry, err); |
2817b000 SW |
655 | dentry = ceph_finish_lookup(req, dentry, err); |
656 | ceph_mdsc_put_request(req); /* will dput(dentry) */ | |
657 | dout("lookup result=%p\n", dentry); | |
658 | return dentry; | |
659 | } | |
660 | ||
661 | /* | |
662 | * If we do a create but get no trace back from the MDS, follow up with | |
663 | * a lookup (the VFS expects us to link up the provided dentry). | |
664 | */ | |
665 | int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry) | |
666 | { | |
00cd8dd3 | 667 | struct dentry *result = ceph_lookup(dir, dentry, 0); |
2817b000 SW |
668 | |
669 | if (result && !IS_ERR(result)) { | |
670 | /* | |
671 | * We created the item, then did a lookup, and found | |
672 | * it was already linked to another inode we already | |
4d41cef2 YZ |
673 | * had in our cache (and thus got spliced). To not |
674 | * confuse VFS (especially when inode is a directory), | |
675 | * we don't link our dentry to that inode, return an | |
676 | * error instead. | |
677 | * | |
678 | * This event should be rare and it happens only when | |
679 | * we talk to old MDS. Recent MDS does not send traceless | |
680 | * reply for request that creates new inode. | |
2817b000 | 681 | */ |
5cba372c | 682 | d_drop(result); |
4d41cef2 | 683 | return -ESTALE; |
2817b000 SW |
684 | } |
685 | return PTR_ERR(result); | |
686 | } | |
687 | ||
688 | static int ceph_mknod(struct inode *dir, struct dentry *dentry, | |
1a67aafb | 689 | umode_t mode, dev_t rdev) |
2817b000 | 690 | { |
3d14c5d2 YS |
691 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
692 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 | 693 | struct ceph_mds_request *req; |
b1ee94aa | 694 | struct ceph_acls_info acls = {}; |
2817b000 SW |
695 | int err; |
696 | ||
697 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
698 | return -EROFS; | |
699 | ||
b1ee94aa YZ |
700 | err = ceph_pre_init_acls(dir, &mode, &acls); |
701 | if (err < 0) | |
702 | return err; | |
703 | ||
1a67aafb | 704 | dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n", |
2817b000 SW |
705 | dir, dentry, mode, rdev); |
706 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS); | |
707 | if (IS_ERR(req)) { | |
b1ee94aa YZ |
708 | err = PTR_ERR(req); |
709 | goto out; | |
2817b000 SW |
710 | } |
711 | req->r_dentry = dget(dentry); | |
712 | req->r_num_caps = 2; | |
713 | req->r_locked_dir = dir; | |
714 | req->r_args.mknod.mode = cpu_to_le32(mode); | |
715 | req->r_args.mknod.rdev = cpu_to_le32(rdev); | |
716 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
717 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
b1ee94aa YZ |
718 | if (acls.pagelist) { |
719 | req->r_pagelist = acls.pagelist; | |
720 | acls.pagelist = NULL; | |
721 | } | |
2817b000 SW |
722 | err = ceph_mdsc_do_request(mdsc, dir, req); |
723 | if (!err && !req->r_reply_info.head->is_dentry) | |
724 | err = ceph_handle_notrace_create(dir, dentry); | |
725 | ceph_mdsc_put_request(req); | |
b1ee94aa | 726 | out: |
7221fe4c | 727 | if (!err) |
b1ee94aa | 728 | ceph_init_inode_acls(dentry->d_inode, &acls); |
b20a95a0 | 729 | else |
2817b000 | 730 | d_drop(dentry); |
b1ee94aa | 731 | ceph_release_acls_info(&acls); |
2817b000 SW |
732 | return err; |
733 | } | |
734 | ||
4acdaf27 | 735 | static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 736 | bool excl) |
2817b000 | 737 | { |
2d83bde9 | 738 | return ceph_mknod(dir, dentry, mode, 0); |
2817b000 SW |
739 | } |
740 | ||
741 | static int ceph_symlink(struct inode *dir, struct dentry *dentry, | |
742 | const char *dest) | |
743 | { | |
3d14c5d2 YS |
744 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
745 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
746 | struct ceph_mds_request *req; |
747 | int err; | |
748 | ||
749 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
750 | return -EROFS; | |
751 | ||
752 | dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest); | |
753 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS); | |
754 | if (IS_ERR(req)) { | |
b1ee94aa YZ |
755 | err = PTR_ERR(req); |
756 | goto out; | |
2817b000 SW |
757 | } |
758 | req->r_dentry = dget(dentry); | |
759 | req->r_num_caps = 2; | |
760 | req->r_path2 = kstrdup(dest, GFP_NOFS); | |
761 | req->r_locked_dir = dir; | |
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); | |
b1ee94aa YZ |
768 | out: |
769 | if (err) | |
2817b000 SW |
770 | d_drop(dentry); |
771 | return err; | |
772 | } | |
773 | ||
18bb1db3 | 774 | static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
2817b000 | 775 | { |
3d14c5d2 YS |
776 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
777 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 | 778 | struct ceph_mds_request *req; |
b1ee94aa | 779 | struct ceph_acls_info acls = {}; |
2817b000 SW |
780 | int err = -EROFS; |
781 | int op; | |
782 | ||
783 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
784 | /* mkdir .snap/foo is a MKSNAP */ | |
785 | op = CEPH_MDS_OP_MKSNAP; | |
a455589f AV |
786 | dout("mksnap dir %p snap '%pd' dn %p\n", dir, |
787 | dentry, dentry); | |
2817b000 | 788 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { |
18bb1db3 | 789 | dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode); |
2817b000 SW |
790 | op = CEPH_MDS_OP_MKDIR; |
791 | } else { | |
792 | goto out; | |
793 | } | |
b1ee94aa YZ |
794 | |
795 | mode |= S_IFDIR; | |
796 | err = ceph_pre_init_acls(dir, &mode, &acls); | |
797 | if (err < 0) | |
798 | goto out; | |
799 | ||
2817b000 SW |
800 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); |
801 | if (IS_ERR(req)) { | |
802 | err = PTR_ERR(req); | |
803 | goto out; | |
804 | } | |
805 | ||
806 | req->r_dentry = dget(dentry); | |
807 | req->r_num_caps = 2; | |
808 | req->r_locked_dir = dir; | |
809 | req->r_args.mkdir.mode = cpu_to_le32(mode); | |
810 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
811 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
b1ee94aa YZ |
812 | if (acls.pagelist) { |
813 | req->r_pagelist = acls.pagelist; | |
814 | acls.pagelist = NULL; | |
815 | } | |
2817b000 | 816 | err = ceph_mdsc_do_request(mdsc, dir, req); |
275dd19e YZ |
817 | if (!err && |
818 | !req->r_reply_info.head->is_target && | |
819 | !req->r_reply_info.head->is_dentry) | |
2817b000 SW |
820 | err = ceph_handle_notrace_create(dir, dentry); |
821 | ceph_mdsc_put_request(req); | |
822 | out: | |
b20a95a0 | 823 | if (!err) |
b1ee94aa | 824 | ceph_init_inode_acls(dentry->d_inode, &acls); |
b20a95a0 | 825 | else |
2817b000 | 826 | d_drop(dentry); |
b1ee94aa | 827 | ceph_release_acls_info(&acls); |
2817b000 SW |
828 | return err; |
829 | } | |
830 | ||
831 | static int ceph_link(struct dentry *old_dentry, struct inode *dir, | |
832 | 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 ceph_mds_request *req; |
837 | int err; | |
838 | ||
839 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
840 | return -EROFS; | |
841 | ||
842 | dout("link in dir %p old_dentry %p dentry %p\n", dir, | |
843 | old_dentry, dentry); | |
844 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS); | |
845 | if (IS_ERR(req)) { | |
846 | d_drop(dentry); | |
847 | return PTR_ERR(req); | |
848 | } | |
849 | req->r_dentry = dget(dentry); | |
850 | req->r_num_caps = 2; | |
4b58c9b1 | 851 | req->r_old_dentry = dget(old_dentry); |
2817b000 SW |
852 | req->r_locked_dir = dir; |
853 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
854 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
ad88f23f YZ |
855 | /* release LINK_SHARED on source inode (mds will lock it) */ |
856 | req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; | |
2817b000 | 857 | err = ceph_mdsc_do_request(mdsc, dir, req); |
70b666c3 | 858 | if (err) { |
2817b000 | 859 | d_drop(dentry); |
70b666c3 SW |
860 | } else if (!req->r_reply_info.head->is_dentry) { |
861 | ihold(old_dentry->d_inode); | |
862 | d_instantiate(dentry, old_dentry->d_inode); | |
863 | } | |
2817b000 SW |
864 | ceph_mdsc_put_request(req); |
865 | return err; | |
866 | } | |
867 | ||
868 | /* | |
869 | * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it | |
870 | * looks like the link count will hit 0, drop any other caps (other | |
871 | * than PIN) we don't specifically want (due to the file still being | |
872 | * open). | |
873 | */ | |
874 | static int drop_caps_for_unlink(struct inode *inode) | |
875 | { | |
876 | struct ceph_inode_info *ci = ceph_inode(inode); | |
877 | int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; | |
878 | ||
be655596 | 879 | spin_lock(&ci->i_ceph_lock); |
2817b000 SW |
880 | if (inode->i_nlink == 1) { |
881 | drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN); | |
882 | ci->i_ceph_flags |= CEPH_I_NODELAY; | |
883 | } | |
be655596 | 884 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
885 | return drop; |
886 | } | |
887 | ||
888 | /* | |
889 | * rmdir and unlink are differ only by the metadata op code | |
890 | */ | |
891 | static int ceph_unlink(struct inode *dir, struct dentry *dentry) | |
892 | { | |
3d14c5d2 YS |
893 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
894 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
895 | struct inode *inode = dentry->d_inode; |
896 | struct ceph_mds_request *req; | |
897 | int err = -EROFS; | |
898 | int op; | |
899 | ||
900 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
901 | /* rmdir .snap/foo is RMSNAP */ | |
a455589f | 902 | dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry); |
2817b000 SW |
903 | op = CEPH_MDS_OP_RMSNAP; |
904 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { | |
905 | dout("unlink/rmdir dir %p dn %p inode %p\n", | |
906 | dir, dentry, inode); | |
e36cb0b8 | 907 | op = d_is_dir(dentry) ? |
2817b000 SW |
908 | CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK; |
909 | } else | |
910 | goto out; | |
911 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
912 | if (IS_ERR(req)) { | |
913 | err = PTR_ERR(req); | |
914 | goto out; | |
915 | } | |
916 | req->r_dentry = dget(dentry); | |
917 | req->r_num_caps = 2; | |
918 | req->r_locked_dir = dir; | |
919 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
920 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
921 | req->r_inode_drop = drop_caps_for_unlink(inode); | |
922 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
923 | if (!err && !req->r_reply_info.head->is_dentry) | |
924 | d_delete(dentry); | |
925 | ceph_mdsc_put_request(req); | |
926 | out: | |
927 | return err; | |
928 | } | |
929 | ||
930 | static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry, | |
931 | struct inode *new_dir, struct dentry *new_dentry) | |
932 | { | |
3d14c5d2 YS |
933 | struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb); |
934 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
935 | struct ceph_mds_request *req; |
936 | int err; | |
937 | ||
938 | if (ceph_snap(old_dir) != ceph_snap(new_dir)) | |
939 | return -EXDEV; | |
940 | if (ceph_snap(old_dir) != CEPH_NOSNAP || | |
941 | ceph_snap(new_dir) != CEPH_NOSNAP) | |
942 | return -EROFS; | |
943 | dout("rename dir %p dentry %p to dir %p dentry %p\n", | |
944 | old_dir, old_dentry, new_dir, new_dentry); | |
945 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RENAME, USE_AUTH_MDS); | |
946 | if (IS_ERR(req)) | |
947 | return PTR_ERR(req); | |
180061a5 | 948 | ihold(old_dir); |
2817b000 SW |
949 | req->r_dentry = dget(new_dentry); |
950 | req->r_num_caps = 2; | |
951 | req->r_old_dentry = dget(old_dentry); | |
180061a5 | 952 | req->r_old_dentry_dir = old_dir; |
2817b000 SW |
953 | req->r_locked_dir = new_dir; |
954 | req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED; | |
955 | req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL; | |
956 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
957 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
958 | /* release LINK_RDCACHE on source inode (mds will lock it) */ | |
959 | req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; | |
960 | if (new_dentry->d_inode) | |
961 | req->r_inode_drop = drop_caps_for_unlink(new_dentry->d_inode); | |
962 | err = ceph_mdsc_do_request(mdsc, old_dir, req); | |
963 | if (!err && !req->r_reply_info.head->is_dentry) { | |
964 | /* | |
965 | * Normally d_move() is done by fill_trace (called by | |
966 | * do_request, above). If there is no trace, we need | |
967 | * to do it here. | |
968 | */ | |
ea1409f9 | 969 | |
2817b000 | 970 | d_move(old_dentry, new_dentry); |
ea1409f9 SW |
971 | |
972 | /* ensure target dentry is invalidated, despite | |
973 | rehashing bug in vfs_rename_dir */ | |
81a6cf2d | 974 | ceph_invalidate_dentry_lease(new_dentry); |
0a8a70f9 YZ |
975 | |
976 | /* d_move screws up sibling dentries' offsets */ | |
977 | ceph_dir_clear_complete(old_dir); | |
978 | ceph_dir_clear_complete(new_dir); | |
979 | ||
2817b000 SW |
980 | } |
981 | ceph_mdsc_put_request(req); | |
982 | return err; | |
983 | } | |
984 | ||
81a6cf2d SW |
985 | /* |
986 | * Ensure a dentry lease will no longer revalidate. | |
987 | */ | |
988 | void ceph_invalidate_dentry_lease(struct dentry *dentry) | |
989 | { | |
990 | spin_lock(&dentry->d_lock); | |
991 | dentry->d_time = jiffies; | |
992 | ceph_dentry(dentry)->lease_shared_gen = 0; | |
993 | spin_unlock(&dentry->d_lock); | |
994 | } | |
2817b000 SW |
995 | |
996 | /* | |
997 | * Check if dentry lease is valid. If not, delete the lease. Try to | |
998 | * renew if the least is more than half up. | |
999 | */ | |
1000 | static int dentry_lease_is_valid(struct dentry *dentry) | |
1001 | { | |
1002 | struct ceph_dentry_info *di; | |
1003 | struct ceph_mds_session *s; | |
1004 | int valid = 0; | |
1005 | u32 gen; | |
1006 | unsigned long ttl; | |
1007 | struct ceph_mds_session *session = NULL; | |
1008 | struct inode *dir = NULL; | |
1009 | u32 seq = 0; | |
1010 | ||
1011 | spin_lock(&dentry->d_lock); | |
1012 | di = ceph_dentry(dentry); | |
3d8eb7a9 | 1013 | if (di->lease_session) { |
2817b000 | 1014 | s = di->lease_session; |
d8fb02ab | 1015 | spin_lock(&s->s_gen_ttl_lock); |
2817b000 SW |
1016 | gen = s->s_cap_gen; |
1017 | ttl = s->s_cap_ttl; | |
d8fb02ab | 1018 | spin_unlock(&s->s_gen_ttl_lock); |
2817b000 SW |
1019 | |
1020 | if (di->lease_gen == gen && | |
1021 | time_before(jiffies, dentry->d_time) && | |
1022 | time_before(jiffies, ttl)) { | |
1023 | valid = 1; | |
1024 | if (di->lease_renew_after && | |
1025 | time_after(jiffies, di->lease_renew_after)) { | |
1026 | /* we should renew */ | |
1027 | dir = dentry->d_parent->d_inode; | |
1028 | session = ceph_get_mds_session(s); | |
1029 | seq = di->lease_seq; | |
1030 | di->lease_renew_after = 0; | |
1031 | di->lease_renew_from = jiffies; | |
1032 | } | |
2817b000 SW |
1033 | } |
1034 | } | |
1035 | spin_unlock(&dentry->d_lock); | |
1036 | ||
1037 | if (session) { | |
1038 | ceph_mdsc_lease_send_msg(session, dir, dentry, | |
1039 | CEPH_MDS_LEASE_RENEW, seq); | |
1040 | ceph_put_mds_session(session); | |
1041 | } | |
1042 | dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid); | |
1043 | return valid; | |
1044 | } | |
1045 | ||
1046 | /* | |
1047 | * Check if directory-wide content lease/cap is valid. | |
1048 | */ | |
1049 | static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry) | |
1050 | { | |
1051 | struct ceph_inode_info *ci = ceph_inode(dir); | |
1052 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
1053 | int valid = 0; | |
1054 | ||
be655596 | 1055 | spin_lock(&ci->i_ceph_lock); |
2817b000 SW |
1056 | if (ci->i_shared_gen == di->lease_shared_gen) |
1057 | valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1); | |
be655596 | 1058 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
1059 | dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n", |
1060 | dir, (unsigned)ci->i_shared_gen, dentry, | |
1061 | (unsigned)di->lease_shared_gen, valid); | |
1062 | return valid; | |
1063 | } | |
1064 | ||
1065 | /* | |
1066 | * Check if cached dentry can be trusted. | |
1067 | */ | |
0b728e19 | 1068 | static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags) |
2817b000 | 1069 | { |
bf1c6aca | 1070 | int valid = 0; |
34286d66 NP |
1071 | struct inode *dir; |
1072 | ||
0b728e19 | 1073 | if (flags & LOOKUP_RCU) |
34286d66 NP |
1074 | return -ECHILD; |
1075 | ||
a455589f AV |
1076 | dout("d_revalidate %p '%pd' inode %p offset %lld\n", dentry, |
1077 | dentry, dentry->d_inode, ceph_dentry(dentry)->offset); | |
2817b000 | 1078 | |
bf1c6aca SW |
1079 | dir = ceph_get_dentry_parent_inode(dentry); |
1080 | ||
2817b000 SW |
1081 | /* always trust cached snapped dentries, snapdir dentry */ |
1082 | if (ceph_snap(dir) != CEPH_NOSNAP) { | |
a455589f AV |
1083 | dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry, |
1084 | dentry, dentry->d_inode); | |
bf1c6aca SW |
1085 | valid = 1; |
1086 | } else if (dentry->d_inode && | |
1087 | ceph_snap(dentry->d_inode) == CEPH_SNAPDIR) { | |
1088 | valid = 1; | |
1089 | } else if (dentry_lease_is_valid(dentry) || | |
1090 | dir_lease_is_valid(dir, dentry)) { | |
9215aeea YZ |
1091 | if (dentry->d_inode) |
1092 | valid = ceph_is_any_caps(dentry->d_inode); | |
1093 | else | |
1094 | valid = 1; | |
2817b000 | 1095 | } |
2817b000 | 1096 | |
bf1c6aca | 1097 | dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid"); |
9215aeea | 1098 | if (valid) { |
bf1c6aca | 1099 | ceph_dentry_lru_touch(dentry); |
9215aeea YZ |
1100 | } else { |
1101 | ceph_dir_clear_complete(dir); | |
9215aeea | 1102 | } |
bf1c6aca SW |
1103 | iput(dir); |
1104 | return valid; | |
2817b000 SW |
1105 | } |
1106 | ||
1107 | /* | |
147851d2 | 1108 | * Release our ceph_dentry_info. |
2817b000 | 1109 | */ |
147851d2 | 1110 | static void ceph_d_release(struct dentry *dentry) |
2817b000 SW |
1111 | { |
1112 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
2817b000 | 1113 | |
147851d2 | 1114 | dout("d_release %p\n", dentry); |
3d8eb7a9 SW |
1115 | ceph_dentry_lru_del(dentry); |
1116 | if (di->lease_session) | |
1117 | ceph_put_mds_session(di->lease_session); | |
1118 | kmem_cache_free(ceph_dentry_cachep, di); | |
1119 | dentry->d_fsdata = NULL; | |
2817b000 SW |
1120 | } |
1121 | ||
1122 | static int ceph_snapdir_d_revalidate(struct dentry *dentry, | |
0b728e19 | 1123 | unsigned int flags) |
2817b000 SW |
1124 | { |
1125 | /* | |
1126 | * Eventually, we'll want to revalidate snapped metadata | |
1127 | * too... probably... | |
1128 | */ | |
1129 | return 1; | |
1130 | } | |
1131 | ||
b58dc410 SW |
1132 | /* |
1133 | * When the VFS prunes a dentry from the cache, we need to clear the | |
1134 | * complete flag on the parent directory. | |
1135 | * | |
1136 | * Called under dentry->d_lock. | |
1137 | */ | |
1138 | static void ceph_d_prune(struct dentry *dentry) | |
1139 | { | |
774ac21d | 1140 | dout("ceph_d_prune %p\n", dentry); |
b58dc410 SW |
1141 | |
1142 | /* do we have a valid parent? */ | |
8842b3be | 1143 | if (IS_ROOT(dentry)) |
b58dc410 SW |
1144 | return; |
1145 | ||
2f276c51 | 1146 | /* if we are not hashed, we don't affect dir's completeness */ |
b58dc410 SW |
1147 | if (d_unhashed(dentry)) |
1148 | return; | |
2817b000 | 1149 | |
b58dc410 SW |
1150 | /* |
1151 | * we hold d_lock, so d_parent is stable, and d_fsdata is never | |
1152 | * cleared until d_release | |
1153 | */ | |
2f276c51 | 1154 | ceph_dir_clear_complete(dentry->d_parent->d_inode); |
b58dc410 | 1155 | } |
2817b000 SW |
1156 | |
1157 | /* | |
1158 | * read() on a dir. This weird interface hack only works if mounted | |
1159 | * with '-o dirstat'. | |
1160 | */ | |
1161 | static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, | |
1162 | loff_t *ppos) | |
1163 | { | |
1164 | struct ceph_file_info *cf = file->private_data; | |
496ad9aa | 1165 | struct inode *inode = file_inode(file); |
2817b000 SW |
1166 | struct ceph_inode_info *ci = ceph_inode(inode); |
1167 | int left; | |
ae598083 | 1168 | const int bufsize = 1024; |
2817b000 | 1169 | |
3d14c5d2 | 1170 | if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT)) |
2817b000 SW |
1171 | return -EISDIR; |
1172 | ||
1173 | if (!cf->dir_info) { | |
ae598083 | 1174 | cf->dir_info = kmalloc(bufsize, GFP_NOFS); |
2817b000 SW |
1175 | if (!cf->dir_info) |
1176 | return -ENOMEM; | |
1177 | cf->dir_info_len = | |
ae598083 | 1178 | snprintf(cf->dir_info, bufsize, |
2817b000 SW |
1179 | "entries: %20lld\n" |
1180 | " files: %20lld\n" | |
1181 | " subdirs: %20lld\n" | |
1182 | "rentries: %20lld\n" | |
1183 | " rfiles: %20lld\n" | |
1184 | " rsubdirs: %20lld\n" | |
1185 | "rbytes: %20lld\n" | |
1186 | "rctime: %10ld.%09ld\n", | |
1187 | ci->i_files + ci->i_subdirs, | |
1188 | ci->i_files, | |
1189 | ci->i_subdirs, | |
1190 | ci->i_rfiles + ci->i_rsubdirs, | |
1191 | ci->i_rfiles, | |
1192 | ci->i_rsubdirs, | |
1193 | ci->i_rbytes, | |
1194 | (long)ci->i_rctime.tv_sec, | |
1195 | (long)ci->i_rctime.tv_nsec); | |
1196 | } | |
1197 | ||
1198 | if (*ppos >= cf->dir_info_len) | |
1199 | return 0; | |
1200 | size = min_t(unsigned, size, cf->dir_info_len-*ppos); | |
1201 | left = copy_to_user(buf, cf->dir_info + *ppos, size); | |
1202 | if (left == size) | |
1203 | return -EFAULT; | |
1204 | *ppos += (size - left); | |
1205 | return size - left; | |
1206 | } | |
1207 | ||
1208 | /* | |
1209 | * an fsync() on a dir will wait for any uncommitted directory | |
1210 | * operations to commit. | |
1211 | */ | |
02c24a82 JB |
1212 | static int ceph_dir_fsync(struct file *file, loff_t start, loff_t end, |
1213 | int datasync) | |
2817b000 | 1214 | { |
496ad9aa | 1215 | struct inode *inode = file_inode(file); |
2817b000 SW |
1216 | struct ceph_inode_info *ci = ceph_inode(inode); |
1217 | struct list_head *head = &ci->i_unsafe_dirops; | |
1218 | struct ceph_mds_request *req; | |
1219 | u64 last_tid; | |
1220 | int ret = 0; | |
1221 | ||
1222 | dout("dir_fsync %p\n", inode); | |
02c24a82 JB |
1223 | ret = filemap_write_and_wait_range(inode->i_mapping, start, end); |
1224 | if (ret) | |
1225 | return ret; | |
1226 | mutex_lock(&inode->i_mutex); | |
1227 | ||
2817b000 SW |
1228 | spin_lock(&ci->i_unsafe_lock); |
1229 | if (list_empty(head)) | |
1230 | goto out; | |
1231 | ||
1232 | req = list_entry(head->prev, | |
1233 | struct ceph_mds_request, r_unsafe_dir_item); | |
1234 | last_tid = req->r_tid; | |
1235 | ||
1236 | do { | |
1237 | ceph_mdsc_get_request(req); | |
1238 | spin_unlock(&ci->i_unsafe_lock); | |
2ff179e6 | 1239 | |
2817b000 SW |
1240 | dout("dir_fsync %p wait on tid %llu (until %llu)\n", |
1241 | inode, req->r_tid, last_tid); | |
1242 | if (req->r_timeout) { | |
1243 | ret = wait_for_completion_timeout( | |
1244 | &req->r_safe_completion, req->r_timeout); | |
1245 | if (ret > 0) | |
1246 | ret = 0; | |
1247 | else if (ret == 0) | |
1248 | ret = -EIO; /* timed out */ | |
1249 | } else { | |
1250 | wait_for_completion(&req->r_safe_completion); | |
1251 | } | |
2817b000 SW |
1252 | ceph_mdsc_put_request(req); |
1253 | ||
2ff179e6 | 1254 | spin_lock(&ci->i_unsafe_lock); |
2817b000 SW |
1255 | if (ret || list_empty(head)) |
1256 | break; | |
1257 | req = list_entry(head->next, | |
1258 | struct ceph_mds_request, r_unsafe_dir_item); | |
1259 | } while (req->r_tid < last_tid); | |
1260 | out: | |
1261 | spin_unlock(&ci->i_unsafe_lock); | |
02c24a82 JB |
1262 | mutex_unlock(&inode->i_mutex); |
1263 | ||
2817b000 SW |
1264 | return ret; |
1265 | } | |
1266 | ||
1267 | /* | |
1268 | * We maintain a private dentry LRU. | |
1269 | * | |
1270 | * FIXME: this needs to be changed to a per-mds lru to be useful. | |
1271 | */ | |
1272 | void ceph_dentry_lru_add(struct dentry *dn) | |
1273 | { | |
1274 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1275 | struct ceph_mds_client *mdsc; | |
2817b000 | 1276 | |
a455589f | 1277 | dout("dentry_lru_add %p %p '%pd'\n", di, dn, dn); |
3d8eb7a9 SW |
1278 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
1279 | spin_lock(&mdsc->dentry_lru_lock); | |
1280 | list_add_tail(&di->lru, &mdsc->dentry_lru); | |
1281 | mdsc->num_dentry++; | |
1282 | spin_unlock(&mdsc->dentry_lru_lock); | |
2817b000 SW |
1283 | } |
1284 | ||
1285 | void ceph_dentry_lru_touch(struct dentry *dn) | |
1286 | { | |
1287 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1288 | struct ceph_mds_client *mdsc; | |
2817b000 | 1289 | |
a455589f AV |
1290 | dout("dentry_lru_touch %p %p '%pd' (offset %lld)\n", di, dn, dn, |
1291 | di->offset); | |
3d8eb7a9 SW |
1292 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
1293 | spin_lock(&mdsc->dentry_lru_lock); | |
1294 | list_move_tail(&di->lru, &mdsc->dentry_lru); | |
1295 | spin_unlock(&mdsc->dentry_lru_lock); | |
2817b000 SW |
1296 | } |
1297 | ||
1298 | void ceph_dentry_lru_del(struct dentry *dn) | |
1299 | { | |
1300 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1301 | struct ceph_mds_client *mdsc; | |
1302 | ||
a455589f | 1303 | dout("dentry_lru_del %p %p '%pd'\n", di, dn, dn); |
3d8eb7a9 SW |
1304 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
1305 | spin_lock(&mdsc->dentry_lru_lock); | |
1306 | list_del_init(&di->lru); | |
1307 | mdsc->num_dentry--; | |
1308 | spin_unlock(&mdsc->dentry_lru_lock); | |
2817b000 SW |
1309 | } |
1310 | ||
6c0f3af7 SW |
1311 | /* |
1312 | * Return name hash for a given dentry. This is dependent on | |
1313 | * the parent directory's hash function. | |
1314 | */ | |
e5f86dc3 | 1315 | unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn) |
6c0f3af7 | 1316 | { |
6c0f3af7 SW |
1317 | struct ceph_inode_info *dci = ceph_inode(dir); |
1318 | ||
1319 | switch (dci->i_dir_layout.dl_dir_hash) { | |
1320 | case 0: /* for backward compat */ | |
1321 | case CEPH_STR_HASH_LINUX: | |
1322 | return dn->d_name.hash; | |
1323 | ||
1324 | default: | |
1325 | return ceph_str_hash(dci->i_dir_layout.dl_dir_hash, | |
1326 | dn->d_name.name, dn->d_name.len); | |
1327 | } | |
1328 | } | |
1329 | ||
2817b000 SW |
1330 | const struct file_operations ceph_dir_fops = { |
1331 | .read = ceph_read_dir, | |
77acfa29 | 1332 | .iterate = ceph_readdir, |
2817b000 SW |
1333 | .llseek = ceph_dir_llseek, |
1334 | .open = ceph_open, | |
1335 | .release = ceph_release, | |
1336 | .unlocked_ioctl = ceph_ioctl, | |
1337 | .fsync = ceph_dir_fsync, | |
1338 | }; | |
1339 | ||
38c48b5f YZ |
1340 | const struct file_operations ceph_snapdir_fops = { |
1341 | .iterate = ceph_readdir, | |
1342 | .llseek = ceph_dir_llseek, | |
1343 | .open = ceph_open, | |
1344 | .release = ceph_release, | |
1345 | }; | |
1346 | ||
2817b000 SW |
1347 | const struct inode_operations ceph_dir_iops = { |
1348 | .lookup = ceph_lookup, | |
1349 | .permission = ceph_permission, | |
1350 | .getattr = ceph_getattr, | |
1351 | .setattr = ceph_setattr, | |
1352 | .setxattr = ceph_setxattr, | |
1353 | .getxattr = ceph_getxattr, | |
1354 | .listxattr = ceph_listxattr, | |
1355 | .removexattr = ceph_removexattr, | |
7221fe4c | 1356 | .get_acl = ceph_get_acl, |
72466d0b | 1357 | .set_acl = ceph_set_acl, |
2817b000 SW |
1358 | .mknod = ceph_mknod, |
1359 | .symlink = ceph_symlink, | |
1360 | .mkdir = ceph_mkdir, | |
1361 | .link = ceph_link, | |
1362 | .unlink = ceph_unlink, | |
1363 | .rmdir = ceph_unlink, | |
1364 | .rename = ceph_rename, | |
1365 | .create = ceph_create, | |
2d83bde9 | 1366 | .atomic_open = ceph_atomic_open, |
2817b000 SW |
1367 | }; |
1368 | ||
38c48b5f YZ |
1369 | const struct inode_operations ceph_snapdir_iops = { |
1370 | .lookup = ceph_lookup, | |
1371 | .permission = ceph_permission, | |
1372 | .getattr = ceph_getattr, | |
1373 | .mkdir = ceph_mkdir, | |
1374 | .rmdir = ceph_unlink, | |
1375 | }; | |
1376 | ||
52dfb8ac | 1377 | const struct dentry_operations ceph_dentry_ops = { |
2817b000 | 1378 | .d_revalidate = ceph_d_revalidate, |
147851d2 | 1379 | .d_release = ceph_d_release, |
b58dc410 | 1380 | .d_prune = ceph_d_prune, |
2817b000 SW |
1381 | }; |
1382 | ||
52dfb8ac | 1383 | const struct dentry_operations ceph_snapdir_dentry_ops = { |
2817b000 | 1384 | .d_revalidate = ceph_snapdir_d_revalidate, |
147851d2 | 1385 | .d_release = ceph_d_release, |
2817b000 SW |
1386 | }; |
1387 | ||
52dfb8ac | 1388 | const struct dentry_operations ceph_snap_dentry_ops = { |
147851d2 | 1389 | .d_release = ceph_d_release, |
b58dc410 | 1390 | .d_prune = ceph_d_prune, |
2817b000 | 1391 | }; |