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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 | ||
687265e5 | 41 | di = kmem_cache_alloc(ceph_dentry_cachep, GFP_KERNEL | __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 | |
2b0143b5 | 52 | if (ceph_snap(d_inode(dentry->d_parent)) == CEPH_NOSNAP) |
48d0cbd1 | 53 | d_set_d_op(dentry, &ceph_dentry_ops); |
2b0143b5 | 54 | else if (ceph_snap(d_inode(dentry->d_parent)) == CEPH_SNAPDIR) |
48d0cbd1 SW |
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)) { |
2b0143b5 | 80 | inode = d_inode(dentry->d_parent); |
5f21c96d SW |
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; |
2b0143b5 | 125 | struct inode *dir = d_inode(parent); |
2817b000 SW |
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 | 163 | if (di->lease_shared_gen == shared_gen && |
2b0143b5 DH |
164 | !d_unhashed(dentry) && d_really_is_positive(dentry) && |
165 | ceph_snap(d_inode(dentry)) != CEPH_SNAPDIR && | |
166 | ceph_ino(d_inode(dentry)) != 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" : "", |
2b0143b5 | 172 | !d_inode(dentry) ? " 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 | 191 | dout(" %llu (%llu) dentry %p %pd %p\n", di->offset, ctx->pos, |
2b0143b5 | 192 | dentry, dentry, d_inode(dentry)); |
77acfa29 AV |
193 | if (!dir_emit(ctx, dentry->d_name.name, |
194 | dentry->d_name.len, | |
2b0143b5 DH |
195 | ceph_translate_ino(dentry->d_sb, d_inode(dentry)->i_ino), |
196 | d_inode(dentry)->i_mode >> 12)) { | |
77acfa29 | 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); | |
687265e5 | 234 | fi->last_name = kmalloc(len+1, GFP_KERNEL); |
2817b000 SW |
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) && |
e2c3de04 | 284 | ceph_test_mount_opt(fsc, DCACHE) && |
3d14c5d2 | 285 | !ceph_test_mount_opt(fsc, NOASYNCREADDIR) && |
a0dff78d | 286 | ceph_snap(inode) != CEPH_SNAPDIR && |
70db4f36 | 287 | __ceph_dir_is_complete_ordered(ci) && |
2817b000 | 288 | __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) { |
a30be7cb | 289 | u32 shared_gen = ci->i_shared_gen; |
be655596 | 290 | spin_unlock(&ci->i_ceph_lock); |
a30be7cb | 291 | err = __dcache_readdir(file, ctx, shared_gen); |
efa4c120 | 292 | if (err != -EAGAIN) |
2817b000 | 293 | return err; |
0081bd83 YZ |
294 | frag = fpos_frag(ctx->pos); |
295 | off = fpos_off(ctx->pos); | |
efa4c120 | 296 | } else { |
be655596 | 297 | spin_unlock(&ci->i_ceph_lock); |
2817b000 | 298 | } |
2817b000 SW |
299 | if (fi->dentry) { |
300 | err = note_last_dentry(fi, fi->dentry->d_name.name, | |
301 | fi->dentry->d_name.len); | |
302 | if (err) | |
303 | return err; | |
304 | dput(fi->dentry); | |
305 | fi->dentry = NULL; | |
306 | } | |
307 | ||
308 | /* proceed with a normal readdir */ | |
309 | ||
70db4f36 YZ |
310 | if (ctx->pos == 2) { |
311 | /* note dir version at start of readdir so we can tell | |
312 | * if any dentries get dropped */ | |
313 | fi->dir_release_count = atomic_read(&ci->i_release_count); | |
314 | fi->dir_ordered_count = ci->i_ordered_count; | |
315 | } | |
316 | ||
2817b000 SW |
317 | more: |
318 | /* do we have the correct frag content buffered? */ | |
319 | if (fi->frag != frag || fi->last_readdir == NULL) { | |
320 | struct ceph_mds_request *req; | |
321 | int op = ceph_snap(inode) == CEPH_SNAPDIR ? | |
322 | CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR; | |
323 | ||
324 | /* discard old result, if any */ | |
393f6620 | 325 | if (fi->last_readdir) { |
2817b000 | 326 | ceph_mdsc_put_request(fi->last_readdir); |
393f6620 SW |
327 | fi->last_readdir = NULL; |
328 | } | |
2817b000 | 329 | |
2817b000 SW |
330 | dout("readdir fetching %llx.%llx frag %x offset '%s'\n", |
331 | ceph_vinop(inode), frag, fi->last_name); | |
332 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
333 | if (IS_ERR(req)) | |
334 | return PTR_ERR(req); | |
54008399 YZ |
335 | err = ceph_alloc_readdir_reply_buffer(req, inode); |
336 | if (err) { | |
337 | ceph_mdsc_put_request(req); | |
338 | return err; | |
339 | } | |
2817b000 SW |
340 | /* hints to request -> mds selection code */ |
341 | req->r_direct_mode = USE_AUTH_MDS; | |
342 | req->r_direct_hash = ceph_frag_value(frag); | |
343 | req->r_direct_is_hash = true; | |
a149bb9a | 344 | if (fi->last_name) { |
687265e5 | 345 | req->r_path2 = kstrdup(fi->last_name, GFP_KERNEL); |
a149bb9a SK |
346 | if (!req->r_path2) { |
347 | ceph_mdsc_put_request(req); | |
348 | return -ENOMEM; | |
349 | } | |
350 | } | |
2817b000 SW |
351 | req->r_readdir_offset = fi->next_offset; |
352 | req->r_args.readdir.frag = cpu_to_le32(frag); | |
a149bb9a SK |
353 | |
354 | req->r_inode = inode; | |
355 | ihold(inode); | |
356 | req->r_dentry = dget(file->f_path.dentry); | |
2817b000 SW |
357 | err = ceph_mdsc_do_request(mdsc, NULL, req); |
358 | if (err < 0) { | |
359 | ceph_mdsc_put_request(req); | |
360 | return err; | |
361 | } | |
362 | dout("readdir got and parsed readdir result=%d" | |
363 | " on frag %x, end=%d, complete=%d\n", err, frag, | |
364 | (int)req->r_reply_info.dir_end, | |
365 | (int)req->r_reply_info.dir_complete); | |
366 | ||
367 | if (!req->r_did_prepopulate) { | |
368 | dout("readdir !did_prepopulate"); | |
2f276c51 YZ |
369 | /* preclude from marking dir complete */ |
370 | fi->dir_release_count--; | |
2817b000 SW |
371 | } |
372 | ||
373 | /* note next offset and last dentry name */ | |
81c6aea5 YZ |
374 | rinfo = &req->r_reply_info; |
375 | if (le32_to_cpu(rinfo->dir_dir->frag) != frag) { | |
376 | frag = le32_to_cpu(rinfo->dir_dir->frag); | |
377 | if (ceph_frag_is_leftmost(frag)) | |
378 | fi->next_offset = 2; | |
379 | else | |
380 | fi->next_offset = 0; | |
381 | off = fi->next_offset; | |
382 | } | |
f0494206 | 383 | fi->frag = frag; |
2817b000 SW |
384 | fi->offset = fi->next_offset; |
385 | fi->last_readdir = req; | |
386 | ||
387 | if (req->r_reply_info.dir_end) { | |
388 | kfree(fi->last_name); | |
389 | fi->last_name = NULL; | |
7b88dadc SW |
390 | if (ceph_frag_is_rightmost(frag)) |
391 | fi->next_offset = 2; | |
392 | else | |
393 | fi->next_offset = 0; | |
2817b000 | 394 | } else { |
2817b000 SW |
395 | err = note_last_dentry(fi, |
396 | rinfo->dir_dname[rinfo->dir_nr-1], | |
397 | rinfo->dir_dname_len[rinfo->dir_nr-1]); | |
398 | if (err) | |
399 | return err; | |
400 | fi->next_offset += rinfo->dir_nr; | |
401 | } | |
402 | } | |
403 | ||
404 | rinfo = &fi->last_readdir->r_reply_info; | |
405 | dout("readdir frag %x num %d off %d chunkoff %d\n", frag, | |
406 | rinfo->dir_nr, off, fi->offset); | |
77acfa29 AV |
407 | |
408 | ctx->pos = ceph_make_fpos(frag, off); | |
da39822c | 409 | while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) { |
2817b000 SW |
410 | struct ceph_mds_reply_inode *in = |
411 | rinfo->dir_in[off - fi->offset].in; | |
3105c19c SW |
412 | struct ceph_vino vino; |
413 | ino_t ino; | |
414 | ||
2817b000 | 415 | dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n", |
77acfa29 | 416 | off, off - fi->offset, rinfo->dir_nr, ctx->pos, |
2817b000 SW |
417 | rinfo->dir_dname_len[off - fi->offset], |
418 | rinfo->dir_dname[off - fi->offset], in); | |
419 | BUG_ON(!in); | |
420 | ftype = le32_to_cpu(in->mode) >> 12; | |
3105c19c SW |
421 | vino.ino = le64_to_cpu(in->ino); |
422 | vino.snap = le64_to_cpu(in->snapid); | |
423 | ino = ceph_vino_to_ino(vino); | |
77acfa29 | 424 | if (!dir_emit(ctx, |
2817b000 SW |
425 | rinfo->dir_dname[off - fi->offset], |
426 | rinfo->dir_dname_len[off - fi->offset], | |
77acfa29 | 427 | ceph_translate_ino(inode->i_sb, ino), ftype)) { |
2817b000 SW |
428 | dout("filldir stopping us...\n"); |
429 | return 0; | |
430 | } | |
431 | off++; | |
77acfa29 | 432 | ctx->pos++; |
2817b000 SW |
433 | } |
434 | ||
435 | if (fi->last_name) { | |
436 | ceph_mdsc_put_request(fi->last_readdir); | |
437 | fi->last_readdir = NULL; | |
438 | goto more; | |
439 | } | |
440 | ||
441 | /* more frags? */ | |
442 | if (!ceph_frag_is_rightmost(frag)) { | |
443 | frag = ceph_frag_next(frag); | |
444 | off = 0; | |
77acfa29 | 445 | ctx->pos = ceph_make_fpos(frag, off); |
2817b000 SW |
446 | dout("readdir next frag is %x\n", frag); |
447 | goto more; | |
448 | } | |
9cfa1098 | 449 | fi->flags |= CEPH_F_ATEND; |
2817b000 SW |
450 | |
451 | /* | |
452 | * if dir_release_count still matches the dir, no dentries | |
453 | * were released during the whole readdir, and we should have | |
454 | * the complete dir contents in our cache. | |
455 | */ | |
be655596 | 456 | spin_lock(&ci->i_ceph_lock); |
2f276c51 | 457 | if (atomic_read(&ci->i_release_count) == fi->dir_release_count) { |
70db4f36 YZ |
458 | if (ci->i_ordered_count == fi->dir_ordered_count) |
459 | dout(" marking %p complete and ordered\n", inode); | |
460 | else | |
461 | dout(" marking %p complete\n", inode); | |
462 | __ceph_dir_set_complete(ci, fi->dir_release_count, | |
463 | fi->dir_ordered_count); | |
2817b000 | 464 | } |
be655596 | 465 | spin_unlock(&ci->i_ceph_lock); |
2817b000 | 466 | |
77acfa29 | 467 | dout("readdir %p file %p done.\n", inode, file); |
2817b000 SW |
468 | return 0; |
469 | } | |
470 | ||
dcd3cc05 | 471 | static void reset_readdir(struct ceph_file_info *fi, unsigned frag) |
2817b000 SW |
472 | { |
473 | if (fi->last_readdir) { | |
474 | ceph_mdsc_put_request(fi->last_readdir); | |
475 | fi->last_readdir = NULL; | |
476 | } | |
477 | kfree(fi->last_name); | |
a1629c3b | 478 | fi->last_name = NULL; |
dcd3cc05 YZ |
479 | if (ceph_frag_is_leftmost(frag)) |
480 | fi->next_offset = 2; /* compensate for . and .. */ | |
481 | else | |
482 | fi->next_offset = 0; | |
2817b000 SW |
483 | if (fi->dentry) { |
484 | dput(fi->dentry); | |
485 | fi->dentry = NULL; | |
486 | } | |
9cfa1098 | 487 | fi->flags &= ~CEPH_F_ATEND; |
2817b000 SW |
488 | } |
489 | ||
965c8e59 | 490 | static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence) |
2817b000 SW |
491 | { |
492 | struct ceph_file_info *fi = file->private_data; | |
493 | struct inode *inode = file->f_mapping->host; | |
f0494206 | 494 | loff_t old_offset = ceph_make_fpos(fi->frag, fi->next_offset); |
2817b000 SW |
495 | loff_t retval; |
496 | ||
497 | mutex_lock(&inode->i_mutex); | |
06222e49 | 498 | retval = -EINVAL; |
965c8e59 | 499 | switch (whence) { |
2817b000 SW |
500 | case SEEK_END: |
501 | offset += inode->i_size + 2; /* FIXME */ | |
502 | break; | |
503 | case SEEK_CUR: | |
504 | offset += file->f_pos; | |
06222e49 JB |
505 | case SEEK_SET: |
506 | break; | |
507 | default: | |
508 | goto out; | |
2817b000 | 509 | } |
06222e49 | 510 | |
f0494206 | 511 | if (offset >= 0) { |
2817b000 SW |
512 | if (offset != file->f_pos) { |
513 | file->f_pos = offset; | |
514 | file->f_version = 0; | |
9cfa1098 | 515 | fi->flags &= ~CEPH_F_ATEND; |
2817b000 SW |
516 | } |
517 | retval = offset; | |
518 | ||
519 | /* | |
520 | * discard buffered readdir content on seekdir(0), or | |
521 | * seek to new frag, or seek prior to current chunk. | |
522 | */ | |
523 | if (offset == 0 || | |
f0494206 | 524 | fpos_frag(offset) != fi->frag || |
2817b000 SW |
525 | fpos_off(offset) < fi->offset) { |
526 | dout("dir_llseek dropping %p content\n", file); | |
dcd3cc05 | 527 | reset_readdir(fi, fpos_frag(offset)); |
2817b000 SW |
528 | } |
529 | ||
530 | /* bump dir_release_count if we did a forward seek */ | |
f0494206 | 531 | if (fpos_cmp(offset, old_offset) > 0) |
2817b000 SW |
532 | fi->dir_release_count--; |
533 | } | |
06222e49 | 534 | out: |
2817b000 SW |
535 | mutex_unlock(&inode->i_mutex); |
536 | return retval; | |
537 | } | |
538 | ||
539 | /* | |
468640e3 | 540 | * Handle lookups for the hidden .snap directory. |
2817b000 | 541 | */ |
468640e3 SW |
542 | int ceph_handle_snapdir(struct ceph_mds_request *req, |
543 | struct dentry *dentry, int err) | |
2817b000 | 544 | { |
3d14c5d2 | 545 | struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); |
2b0143b5 | 546 | struct inode *parent = d_inode(dentry->d_parent); /* we hold i_mutex */ |
2817b000 SW |
547 | |
548 | /* .snap dir? */ | |
549 | if (err == -ENOENT && | |
455cec0a | 550 | ceph_snap(parent) == CEPH_NOSNAP && |
6b805185 | 551 | strcmp(dentry->d_name.name, |
3d14c5d2 | 552 | fsc->mount_options->snapdir_name) == 0) { |
2817b000 | 553 | struct inode *inode = ceph_get_snapdir(parent); |
a455589f AV |
554 | dout("ENOENT on snapdir %p '%pd', linking to snapdir %p\n", |
555 | dentry, dentry, inode); | |
9358c6d4 | 556 | BUG_ON(!d_unhashed(dentry)); |
2817b000 SW |
557 | d_add(dentry, inode); |
558 | err = 0; | |
559 | } | |
468640e3 SW |
560 | return err; |
561 | } | |
2817b000 | 562 | |
468640e3 SW |
563 | /* |
564 | * Figure out final result of a lookup/open request. | |
565 | * | |
566 | * Mainly, make sure we return the final req->r_dentry (if it already | |
567 | * existed) in place of the original VFS-provided dentry when they | |
568 | * differ. | |
569 | * | |
570 | * Gracefully handle the case where the MDS replies with -ENOENT and | |
571 | * no trace (which it may do, at its discretion, e.g., if it doesn't | |
572 | * care to issue a lease on the negative dentry). | |
573 | */ | |
574 | struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, | |
575 | struct dentry *dentry, int err) | |
576 | { | |
2817b000 SW |
577 | if (err == -ENOENT) { |
578 | /* no trace? */ | |
579 | err = 0; | |
580 | if (!req->r_reply_info.head->is_dentry) { | |
581 | dout("ENOENT and no trace, dentry %p inode %p\n", | |
2b0143b5 DH |
582 | dentry, d_inode(dentry)); |
583 | if (d_really_is_positive(dentry)) { | |
2817b000 SW |
584 | d_drop(dentry); |
585 | err = -ENOENT; | |
586 | } else { | |
587 | d_add(dentry, NULL); | |
588 | } | |
589 | } | |
590 | } | |
591 | if (err) | |
592 | dentry = ERR_PTR(err); | |
593 | else if (dentry != req->r_dentry) | |
594 | dentry = dget(req->r_dentry); /* we got spliced */ | |
595 | else | |
596 | dentry = NULL; | |
597 | return dentry; | |
598 | } | |
599 | ||
1d1de916 SW |
600 | static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry) |
601 | { | |
602 | return ceph_ino(inode) == CEPH_INO_ROOT && | |
603 | strncmp(dentry->d_name.name, ".ceph", 5) == 0; | |
604 | } | |
605 | ||
2817b000 SW |
606 | /* |
607 | * Look up a single dir entry. If there is a lookup intent, inform | |
608 | * the MDS so that it gets our 'caps wanted' value in a single op. | |
609 | */ | |
610 | static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry, | |
00cd8dd3 | 611 | unsigned int flags) |
2817b000 | 612 | { |
3d14c5d2 YS |
613 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
614 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
615 | struct ceph_mds_request *req; |
616 | int op; | |
617 | int err; | |
618 | ||
a455589f AV |
619 | dout("lookup %p dentry %p '%pd'\n", |
620 | dir, dentry, dentry); | |
2817b000 SW |
621 | |
622 | if (dentry->d_name.len > NAME_MAX) | |
623 | return ERR_PTR(-ENAMETOOLONG); | |
624 | ||
625 | err = ceph_init_dentry(dentry); | |
626 | if (err < 0) | |
627 | return ERR_PTR(err); | |
628 | ||
2817b000 | 629 | /* can we conclude ENOENT locally? */ |
2b0143b5 | 630 | if (d_really_is_negative(dentry)) { |
2817b000 SW |
631 | struct ceph_inode_info *ci = ceph_inode(dir); |
632 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
633 | ||
be655596 | 634 | spin_lock(&ci->i_ceph_lock); |
2817b000 SW |
635 | dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags); |
636 | if (strncmp(dentry->d_name.name, | |
3d14c5d2 | 637 | fsc->mount_options->snapdir_name, |
2817b000 | 638 | dentry->d_name.len) && |
1d1de916 | 639 | !is_root_ceph_dentry(dir, dentry) && |
e2c3de04 | 640 | ceph_test_mount_opt(fsc, DCACHE) && |
2f276c51 | 641 | __ceph_dir_is_complete(ci) && |
2817b000 | 642 | (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) { |
be655596 | 643 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
644 | dout(" dir %p complete, -ENOENT\n", dir); |
645 | d_add(dentry, NULL); | |
646 | di->lease_shared_gen = ci->i_shared_gen; | |
647 | return NULL; | |
648 | } | |
be655596 | 649 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
650 | } |
651 | ||
652 | op = ceph_snap(dir) == CEPH_SNAPDIR ? | |
653 | CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; | |
654 | req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); | |
655 | if (IS_ERR(req)) | |
7e34bc52 | 656 | return ERR_CAST(req); |
2817b000 SW |
657 | req->r_dentry = dget(dentry); |
658 | req->r_num_caps = 2; | |
659 | /* we only need inode linkage */ | |
660 | req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); | |
661 | req->r_locked_dir = dir; | |
662 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
468640e3 | 663 | err = ceph_handle_snapdir(req, dentry, err); |
2817b000 SW |
664 | dentry = ceph_finish_lookup(req, dentry, err); |
665 | ceph_mdsc_put_request(req); /* will dput(dentry) */ | |
666 | dout("lookup result=%p\n", dentry); | |
667 | return dentry; | |
668 | } | |
669 | ||
670 | /* | |
671 | * If we do a create but get no trace back from the MDS, follow up with | |
672 | * a lookup (the VFS expects us to link up the provided dentry). | |
673 | */ | |
674 | int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry) | |
675 | { | |
00cd8dd3 | 676 | struct dentry *result = ceph_lookup(dir, dentry, 0); |
2817b000 SW |
677 | |
678 | if (result && !IS_ERR(result)) { | |
679 | /* | |
680 | * We created the item, then did a lookup, and found | |
681 | * it was already linked to another inode we already | |
4d41cef2 YZ |
682 | * had in our cache (and thus got spliced). To not |
683 | * confuse VFS (especially when inode is a directory), | |
684 | * we don't link our dentry to that inode, return an | |
685 | * error instead. | |
686 | * | |
687 | * This event should be rare and it happens only when | |
688 | * we talk to old MDS. Recent MDS does not send traceless | |
689 | * reply for request that creates new inode. | |
2817b000 | 690 | */ |
5cba372c | 691 | d_drop(result); |
4d41cef2 | 692 | return -ESTALE; |
2817b000 SW |
693 | } |
694 | return PTR_ERR(result); | |
695 | } | |
696 | ||
697 | static int ceph_mknod(struct inode *dir, struct dentry *dentry, | |
1a67aafb | 698 | umode_t mode, dev_t rdev) |
2817b000 | 699 | { |
3d14c5d2 YS |
700 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
701 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 | 702 | struct ceph_mds_request *req; |
b1ee94aa | 703 | struct ceph_acls_info acls = {}; |
2817b000 SW |
704 | int err; |
705 | ||
706 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
707 | return -EROFS; | |
708 | ||
b1ee94aa YZ |
709 | err = ceph_pre_init_acls(dir, &mode, &acls); |
710 | if (err < 0) | |
711 | return err; | |
712 | ||
1a67aafb | 713 | dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n", |
2817b000 SW |
714 | dir, dentry, mode, rdev); |
715 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS); | |
716 | if (IS_ERR(req)) { | |
b1ee94aa YZ |
717 | err = PTR_ERR(req); |
718 | goto out; | |
2817b000 SW |
719 | } |
720 | req->r_dentry = dget(dentry); | |
721 | req->r_num_caps = 2; | |
722 | req->r_locked_dir = dir; | |
723 | req->r_args.mknod.mode = cpu_to_le32(mode); | |
724 | req->r_args.mknod.rdev = cpu_to_le32(rdev); | |
725 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
726 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
b1ee94aa YZ |
727 | if (acls.pagelist) { |
728 | req->r_pagelist = acls.pagelist; | |
729 | acls.pagelist = NULL; | |
730 | } | |
2817b000 SW |
731 | err = ceph_mdsc_do_request(mdsc, dir, req); |
732 | if (!err && !req->r_reply_info.head->is_dentry) | |
733 | err = ceph_handle_notrace_create(dir, dentry); | |
734 | ceph_mdsc_put_request(req); | |
b1ee94aa | 735 | out: |
7221fe4c | 736 | if (!err) |
2b0143b5 | 737 | ceph_init_inode_acls(d_inode(dentry), &acls); |
b20a95a0 | 738 | else |
2817b000 | 739 | d_drop(dentry); |
b1ee94aa | 740 | ceph_release_acls_info(&acls); |
2817b000 SW |
741 | return err; |
742 | } | |
743 | ||
4acdaf27 | 744 | static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 745 | bool excl) |
2817b000 | 746 | { |
2d83bde9 | 747 | return ceph_mknod(dir, dentry, mode, 0); |
2817b000 SW |
748 | } |
749 | ||
750 | static int ceph_symlink(struct inode *dir, struct dentry *dentry, | |
751 | const char *dest) | |
752 | { | |
3d14c5d2 YS |
753 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
754 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
755 | struct ceph_mds_request *req; |
756 | int err; | |
757 | ||
758 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
759 | return -EROFS; | |
760 | ||
761 | dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest); | |
762 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS); | |
763 | if (IS_ERR(req)) { | |
b1ee94aa YZ |
764 | err = PTR_ERR(req); |
765 | goto out; | |
2817b000 | 766 | } |
687265e5 | 767 | req->r_path2 = kstrdup(dest, GFP_KERNEL); |
a149bb9a SK |
768 | if (!req->r_path2) { |
769 | err = -ENOMEM; | |
770 | ceph_mdsc_put_request(req); | |
771 | goto out; | |
772 | } | |
2817b000 | 773 | req->r_locked_dir = dir; |
a149bb9a SK |
774 | req->r_dentry = dget(dentry); |
775 | req->r_num_caps = 2; | |
2817b000 SW |
776 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; |
777 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
778 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
779 | if (!err && !req->r_reply_info.head->is_dentry) | |
780 | err = ceph_handle_notrace_create(dir, dentry); | |
781 | ceph_mdsc_put_request(req); | |
b1ee94aa YZ |
782 | out: |
783 | if (err) | |
2817b000 SW |
784 | d_drop(dentry); |
785 | return err; | |
786 | } | |
787 | ||
18bb1db3 | 788 | static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
2817b000 | 789 | { |
3d14c5d2 YS |
790 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
791 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 | 792 | struct ceph_mds_request *req; |
b1ee94aa | 793 | struct ceph_acls_info acls = {}; |
2817b000 SW |
794 | int err = -EROFS; |
795 | int op; | |
796 | ||
797 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
798 | /* mkdir .snap/foo is a MKSNAP */ | |
799 | op = CEPH_MDS_OP_MKSNAP; | |
a455589f AV |
800 | dout("mksnap dir %p snap '%pd' dn %p\n", dir, |
801 | dentry, dentry); | |
2817b000 | 802 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { |
18bb1db3 | 803 | dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode); |
2817b000 SW |
804 | op = CEPH_MDS_OP_MKDIR; |
805 | } else { | |
806 | goto out; | |
807 | } | |
b1ee94aa YZ |
808 | |
809 | mode |= S_IFDIR; | |
810 | err = ceph_pre_init_acls(dir, &mode, &acls); | |
811 | if (err < 0) | |
812 | goto out; | |
813 | ||
2817b000 SW |
814 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); |
815 | if (IS_ERR(req)) { | |
816 | err = PTR_ERR(req); | |
817 | goto out; | |
818 | } | |
819 | ||
820 | req->r_dentry = dget(dentry); | |
821 | req->r_num_caps = 2; | |
822 | req->r_locked_dir = dir; | |
823 | req->r_args.mkdir.mode = cpu_to_le32(mode); | |
824 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
825 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
b1ee94aa YZ |
826 | if (acls.pagelist) { |
827 | req->r_pagelist = acls.pagelist; | |
828 | acls.pagelist = NULL; | |
829 | } | |
2817b000 | 830 | err = ceph_mdsc_do_request(mdsc, dir, req); |
275dd19e YZ |
831 | if (!err && |
832 | !req->r_reply_info.head->is_target && | |
833 | !req->r_reply_info.head->is_dentry) | |
2817b000 SW |
834 | err = ceph_handle_notrace_create(dir, dentry); |
835 | ceph_mdsc_put_request(req); | |
836 | out: | |
b20a95a0 | 837 | if (!err) |
2b0143b5 | 838 | ceph_init_inode_acls(d_inode(dentry), &acls); |
b20a95a0 | 839 | else |
2817b000 | 840 | d_drop(dentry); |
b1ee94aa | 841 | ceph_release_acls_info(&acls); |
2817b000 SW |
842 | return err; |
843 | } | |
844 | ||
845 | static int ceph_link(struct dentry *old_dentry, struct inode *dir, | |
846 | struct dentry *dentry) | |
847 | { | |
3d14c5d2 YS |
848 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
849 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
850 | struct ceph_mds_request *req; |
851 | int err; | |
852 | ||
853 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
854 | return -EROFS; | |
855 | ||
856 | dout("link in dir %p old_dentry %p dentry %p\n", dir, | |
857 | old_dentry, dentry); | |
858 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS); | |
859 | if (IS_ERR(req)) { | |
860 | d_drop(dentry); | |
861 | return PTR_ERR(req); | |
862 | } | |
863 | req->r_dentry = dget(dentry); | |
864 | req->r_num_caps = 2; | |
4b58c9b1 | 865 | req->r_old_dentry = dget(old_dentry); |
2817b000 SW |
866 | req->r_locked_dir = dir; |
867 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
868 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
ad88f23f YZ |
869 | /* release LINK_SHARED on source inode (mds will lock it) */ |
870 | req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; | |
2817b000 | 871 | err = ceph_mdsc_do_request(mdsc, dir, req); |
70b666c3 | 872 | if (err) { |
2817b000 | 873 | d_drop(dentry); |
70b666c3 | 874 | } else if (!req->r_reply_info.head->is_dentry) { |
2b0143b5 DH |
875 | ihold(d_inode(old_dentry)); |
876 | d_instantiate(dentry, d_inode(old_dentry)); | |
70b666c3 | 877 | } |
2817b000 SW |
878 | ceph_mdsc_put_request(req); |
879 | return err; | |
880 | } | |
881 | ||
882 | /* | |
883 | * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it | |
884 | * looks like the link count will hit 0, drop any other caps (other | |
885 | * than PIN) we don't specifically want (due to the file still being | |
886 | * open). | |
887 | */ | |
888 | static int drop_caps_for_unlink(struct inode *inode) | |
889 | { | |
890 | struct ceph_inode_info *ci = ceph_inode(inode); | |
891 | int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; | |
892 | ||
be655596 | 893 | spin_lock(&ci->i_ceph_lock); |
2817b000 SW |
894 | if (inode->i_nlink == 1) { |
895 | drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN); | |
896 | ci->i_ceph_flags |= CEPH_I_NODELAY; | |
897 | } | |
be655596 | 898 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
899 | return drop; |
900 | } | |
901 | ||
902 | /* | |
903 | * rmdir and unlink are differ only by the metadata op code | |
904 | */ | |
905 | static int ceph_unlink(struct inode *dir, struct dentry *dentry) | |
906 | { | |
3d14c5d2 YS |
907 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
908 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2b0143b5 | 909 | struct inode *inode = d_inode(dentry); |
2817b000 SW |
910 | struct ceph_mds_request *req; |
911 | int err = -EROFS; | |
912 | int op; | |
913 | ||
914 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
915 | /* rmdir .snap/foo is RMSNAP */ | |
a455589f | 916 | dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry); |
2817b000 SW |
917 | op = CEPH_MDS_OP_RMSNAP; |
918 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { | |
919 | dout("unlink/rmdir dir %p dn %p inode %p\n", | |
920 | dir, dentry, inode); | |
e36cb0b8 | 921 | op = d_is_dir(dentry) ? |
2817b000 SW |
922 | CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK; |
923 | } else | |
924 | goto out; | |
925 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
926 | if (IS_ERR(req)) { | |
927 | err = PTR_ERR(req); | |
928 | goto out; | |
929 | } | |
930 | req->r_dentry = dget(dentry); | |
931 | req->r_num_caps = 2; | |
932 | req->r_locked_dir = dir; | |
933 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
934 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
935 | req->r_inode_drop = drop_caps_for_unlink(inode); | |
936 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
937 | if (!err && !req->r_reply_info.head->is_dentry) | |
938 | d_delete(dentry); | |
939 | ceph_mdsc_put_request(req); | |
940 | out: | |
941 | return err; | |
942 | } | |
943 | ||
944 | static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry, | |
945 | struct inode *new_dir, struct dentry *new_dentry) | |
946 | { | |
3d14c5d2 YS |
947 | struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb); |
948 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 | 949 | struct ceph_mds_request *req; |
0ea611a3 | 950 | int op = CEPH_MDS_OP_RENAME; |
2817b000 SW |
951 | int err; |
952 | ||
953 | if (ceph_snap(old_dir) != ceph_snap(new_dir)) | |
954 | return -EXDEV; | |
0ea611a3 YZ |
955 | if (ceph_snap(old_dir) != CEPH_NOSNAP) { |
956 | if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR) | |
957 | op = CEPH_MDS_OP_RENAMESNAP; | |
958 | else | |
959 | return -EROFS; | |
960 | } | |
2817b000 SW |
961 | dout("rename dir %p dentry %p to dir %p dentry %p\n", |
962 | old_dir, old_dentry, new_dir, new_dentry); | |
0ea611a3 | 963 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); |
2817b000 SW |
964 | if (IS_ERR(req)) |
965 | return PTR_ERR(req); | |
180061a5 | 966 | ihold(old_dir); |
2817b000 SW |
967 | req->r_dentry = dget(new_dentry); |
968 | req->r_num_caps = 2; | |
969 | req->r_old_dentry = dget(old_dentry); | |
180061a5 | 970 | req->r_old_dentry_dir = old_dir; |
2817b000 SW |
971 | req->r_locked_dir = new_dir; |
972 | req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED; | |
973 | req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL; | |
974 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
975 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
976 | /* release LINK_RDCACHE on source inode (mds will lock it) */ | |
977 | req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; | |
2b0143b5 DH |
978 | if (d_really_is_positive(new_dentry)) |
979 | req->r_inode_drop = drop_caps_for_unlink(d_inode(new_dentry)); | |
2817b000 SW |
980 | err = ceph_mdsc_do_request(mdsc, old_dir, req); |
981 | if (!err && !req->r_reply_info.head->is_dentry) { | |
982 | /* | |
983 | * Normally d_move() is done by fill_trace (called by | |
984 | * do_request, above). If there is no trace, we need | |
985 | * to do it here. | |
986 | */ | |
ea1409f9 | 987 | |
2817b000 | 988 | d_move(old_dentry, new_dentry); |
ea1409f9 SW |
989 | |
990 | /* ensure target dentry is invalidated, despite | |
991 | rehashing bug in vfs_rename_dir */ | |
81a6cf2d | 992 | ceph_invalidate_dentry_lease(new_dentry); |
0a8a70f9 YZ |
993 | |
994 | /* d_move screws up sibling dentries' offsets */ | |
995 | ceph_dir_clear_complete(old_dir); | |
996 | ceph_dir_clear_complete(new_dir); | |
997 | ||
2817b000 SW |
998 | } |
999 | ceph_mdsc_put_request(req); | |
1000 | return err; | |
1001 | } | |
1002 | ||
81a6cf2d SW |
1003 | /* |
1004 | * Ensure a dentry lease will no longer revalidate. | |
1005 | */ | |
1006 | void ceph_invalidate_dentry_lease(struct dentry *dentry) | |
1007 | { | |
1008 | spin_lock(&dentry->d_lock); | |
1009 | dentry->d_time = jiffies; | |
1010 | ceph_dentry(dentry)->lease_shared_gen = 0; | |
1011 | spin_unlock(&dentry->d_lock); | |
1012 | } | |
2817b000 SW |
1013 | |
1014 | /* | |
1015 | * Check if dentry lease is valid. If not, delete the lease. Try to | |
1016 | * renew if the least is more than half up. | |
1017 | */ | |
1018 | static int dentry_lease_is_valid(struct dentry *dentry) | |
1019 | { | |
1020 | struct ceph_dentry_info *di; | |
1021 | struct ceph_mds_session *s; | |
1022 | int valid = 0; | |
1023 | u32 gen; | |
1024 | unsigned long ttl; | |
1025 | struct ceph_mds_session *session = NULL; | |
1026 | struct inode *dir = NULL; | |
1027 | u32 seq = 0; | |
1028 | ||
1029 | spin_lock(&dentry->d_lock); | |
1030 | di = ceph_dentry(dentry); | |
3d8eb7a9 | 1031 | if (di->lease_session) { |
2817b000 | 1032 | s = di->lease_session; |
d8fb02ab | 1033 | spin_lock(&s->s_gen_ttl_lock); |
2817b000 SW |
1034 | gen = s->s_cap_gen; |
1035 | ttl = s->s_cap_ttl; | |
d8fb02ab | 1036 | spin_unlock(&s->s_gen_ttl_lock); |
2817b000 SW |
1037 | |
1038 | if (di->lease_gen == gen && | |
1039 | time_before(jiffies, dentry->d_time) && | |
1040 | time_before(jiffies, ttl)) { | |
1041 | valid = 1; | |
1042 | if (di->lease_renew_after && | |
1043 | time_after(jiffies, di->lease_renew_after)) { | |
1044 | /* we should renew */ | |
2b0143b5 | 1045 | dir = d_inode(dentry->d_parent); |
2817b000 SW |
1046 | session = ceph_get_mds_session(s); |
1047 | seq = di->lease_seq; | |
1048 | di->lease_renew_after = 0; | |
1049 | di->lease_renew_from = jiffies; | |
1050 | } | |
2817b000 SW |
1051 | } |
1052 | } | |
1053 | spin_unlock(&dentry->d_lock); | |
1054 | ||
1055 | if (session) { | |
1056 | ceph_mdsc_lease_send_msg(session, dir, dentry, | |
1057 | CEPH_MDS_LEASE_RENEW, seq); | |
1058 | ceph_put_mds_session(session); | |
1059 | } | |
1060 | dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid); | |
1061 | return valid; | |
1062 | } | |
1063 | ||
1064 | /* | |
1065 | * Check if directory-wide content lease/cap is valid. | |
1066 | */ | |
1067 | static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry) | |
1068 | { | |
1069 | struct ceph_inode_info *ci = ceph_inode(dir); | |
1070 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
1071 | int valid = 0; | |
1072 | ||
be655596 | 1073 | spin_lock(&ci->i_ceph_lock); |
2817b000 SW |
1074 | if (ci->i_shared_gen == di->lease_shared_gen) |
1075 | valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1); | |
be655596 | 1076 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
1077 | dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n", |
1078 | dir, (unsigned)ci->i_shared_gen, dentry, | |
1079 | (unsigned)di->lease_shared_gen, valid); | |
1080 | return valid; | |
1081 | } | |
1082 | ||
1083 | /* | |
1084 | * Check if cached dentry can be trusted. | |
1085 | */ | |
0b728e19 | 1086 | static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags) |
2817b000 | 1087 | { |
bf1c6aca | 1088 | int valid = 0; |
34286d66 NP |
1089 | struct inode *dir; |
1090 | ||
0b728e19 | 1091 | if (flags & LOOKUP_RCU) |
34286d66 NP |
1092 | return -ECHILD; |
1093 | ||
a455589f | 1094 | dout("d_revalidate %p '%pd' inode %p offset %lld\n", dentry, |
2b0143b5 | 1095 | dentry, d_inode(dentry), ceph_dentry(dentry)->offset); |
2817b000 | 1096 | |
bf1c6aca SW |
1097 | dir = ceph_get_dentry_parent_inode(dentry); |
1098 | ||
2817b000 SW |
1099 | /* always trust cached snapped dentries, snapdir dentry */ |
1100 | if (ceph_snap(dir) != CEPH_NOSNAP) { | |
a455589f | 1101 | dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry, |
2b0143b5 | 1102 | dentry, d_inode(dentry)); |
bf1c6aca | 1103 | valid = 1; |
2b0143b5 DH |
1104 | } else if (d_really_is_positive(dentry) && |
1105 | ceph_snap(d_inode(dentry)) == CEPH_SNAPDIR) { | |
bf1c6aca SW |
1106 | valid = 1; |
1107 | } else if (dentry_lease_is_valid(dentry) || | |
1108 | dir_lease_is_valid(dir, dentry)) { | |
2b0143b5 DH |
1109 | if (d_really_is_positive(dentry)) |
1110 | valid = ceph_is_any_caps(d_inode(dentry)); | |
9215aeea YZ |
1111 | else |
1112 | valid = 1; | |
2817b000 | 1113 | } |
2817b000 | 1114 | |
bf1c6aca | 1115 | dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid"); |
9215aeea | 1116 | if (valid) { |
bf1c6aca | 1117 | ceph_dentry_lru_touch(dentry); |
9215aeea YZ |
1118 | } else { |
1119 | ceph_dir_clear_complete(dir); | |
9215aeea | 1120 | } |
bf1c6aca SW |
1121 | iput(dir); |
1122 | return valid; | |
2817b000 SW |
1123 | } |
1124 | ||
1125 | /* | |
147851d2 | 1126 | * Release our ceph_dentry_info. |
2817b000 | 1127 | */ |
147851d2 | 1128 | static void ceph_d_release(struct dentry *dentry) |
2817b000 SW |
1129 | { |
1130 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
2817b000 | 1131 | |
147851d2 | 1132 | dout("d_release %p\n", dentry); |
3d8eb7a9 SW |
1133 | ceph_dentry_lru_del(dentry); |
1134 | if (di->lease_session) | |
1135 | ceph_put_mds_session(di->lease_session); | |
1136 | kmem_cache_free(ceph_dentry_cachep, di); | |
1137 | dentry->d_fsdata = NULL; | |
2817b000 SW |
1138 | } |
1139 | ||
1140 | static int ceph_snapdir_d_revalidate(struct dentry *dentry, | |
0b728e19 | 1141 | unsigned int flags) |
2817b000 SW |
1142 | { |
1143 | /* | |
1144 | * Eventually, we'll want to revalidate snapped metadata | |
1145 | * too... probably... | |
1146 | */ | |
1147 | return 1; | |
1148 | } | |
1149 | ||
b58dc410 SW |
1150 | /* |
1151 | * When the VFS prunes a dentry from the cache, we need to clear the | |
1152 | * complete flag on the parent directory. | |
1153 | * | |
1154 | * Called under dentry->d_lock. | |
1155 | */ | |
1156 | static void ceph_d_prune(struct dentry *dentry) | |
1157 | { | |
774ac21d | 1158 | dout("ceph_d_prune %p\n", dentry); |
b58dc410 SW |
1159 | |
1160 | /* do we have a valid parent? */ | |
8842b3be | 1161 | if (IS_ROOT(dentry)) |
b58dc410 SW |
1162 | return; |
1163 | ||
2f276c51 | 1164 | /* if we are not hashed, we don't affect dir's completeness */ |
b58dc410 SW |
1165 | if (d_unhashed(dentry)) |
1166 | return; | |
2817b000 | 1167 | |
b58dc410 SW |
1168 | /* |
1169 | * we hold d_lock, so d_parent is stable, and d_fsdata is never | |
1170 | * cleared until d_release | |
1171 | */ | |
2b0143b5 | 1172 | ceph_dir_clear_complete(d_inode(dentry->d_parent)); |
b58dc410 | 1173 | } |
2817b000 SW |
1174 | |
1175 | /* | |
1176 | * read() on a dir. This weird interface hack only works if mounted | |
1177 | * with '-o dirstat'. | |
1178 | */ | |
1179 | static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, | |
1180 | loff_t *ppos) | |
1181 | { | |
1182 | struct ceph_file_info *cf = file->private_data; | |
496ad9aa | 1183 | struct inode *inode = file_inode(file); |
2817b000 SW |
1184 | struct ceph_inode_info *ci = ceph_inode(inode); |
1185 | int left; | |
ae598083 | 1186 | const int bufsize = 1024; |
2817b000 | 1187 | |
3d14c5d2 | 1188 | if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT)) |
2817b000 SW |
1189 | return -EISDIR; |
1190 | ||
1191 | if (!cf->dir_info) { | |
687265e5 | 1192 | cf->dir_info = kmalloc(bufsize, GFP_KERNEL); |
2817b000 SW |
1193 | if (!cf->dir_info) |
1194 | return -ENOMEM; | |
1195 | cf->dir_info_len = | |
ae598083 | 1196 | snprintf(cf->dir_info, bufsize, |
2817b000 SW |
1197 | "entries: %20lld\n" |
1198 | " files: %20lld\n" | |
1199 | " subdirs: %20lld\n" | |
1200 | "rentries: %20lld\n" | |
1201 | " rfiles: %20lld\n" | |
1202 | " rsubdirs: %20lld\n" | |
1203 | "rbytes: %20lld\n" | |
1204 | "rctime: %10ld.%09ld\n", | |
1205 | ci->i_files + ci->i_subdirs, | |
1206 | ci->i_files, | |
1207 | ci->i_subdirs, | |
1208 | ci->i_rfiles + ci->i_rsubdirs, | |
1209 | ci->i_rfiles, | |
1210 | ci->i_rsubdirs, | |
1211 | ci->i_rbytes, | |
1212 | (long)ci->i_rctime.tv_sec, | |
1213 | (long)ci->i_rctime.tv_nsec); | |
1214 | } | |
1215 | ||
1216 | if (*ppos >= cf->dir_info_len) | |
1217 | return 0; | |
1218 | size = min_t(unsigned, size, cf->dir_info_len-*ppos); | |
1219 | left = copy_to_user(buf, cf->dir_info + *ppos, size); | |
1220 | if (left == size) | |
1221 | return -EFAULT; | |
1222 | *ppos += (size - left); | |
1223 | return size - left; | |
1224 | } | |
1225 | ||
2817b000 SW |
1226 | /* |
1227 | * We maintain a private dentry LRU. | |
1228 | * | |
1229 | * FIXME: this needs to be changed to a per-mds lru to be useful. | |
1230 | */ | |
1231 | void ceph_dentry_lru_add(struct dentry *dn) | |
1232 | { | |
1233 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1234 | struct ceph_mds_client *mdsc; | |
2817b000 | 1235 | |
a455589f | 1236 | dout("dentry_lru_add %p %p '%pd'\n", di, dn, dn); |
3d8eb7a9 SW |
1237 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
1238 | spin_lock(&mdsc->dentry_lru_lock); | |
1239 | list_add_tail(&di->lru, &mdsc->dentry_lru); | |
1240 | mdsc->num_dentry++; | |
1241 | spin_unlock(&mdsc->dentry_lru_lock); | |
2817b000 SW |
1242 | } |
1243 | ||
1244 | void ceph_dentry_lru_touch(struct dentry *dn) | |
1245 | { | |
1246 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1247 | struct ceph_mds_client *mdsc; | |
2817b000 | 1248 | |
a455589f AV |
1249 | dout("dentry_lru_touch %p %p '%pd' (offset %lld)\n", di, dn, dn, |
1250 | di->offset); | |
3d8eb7a9 SW |
1251 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
1252 | spin_lock(&mdsc->dentry_lru_lock); | |
1253 | list_move_tail(&di->lru, &mdsc->dentry_lru); | |
1254 | spin_unlock(&mdsc->dentry_lru_lock); | |
2817b000 SW |
1255 | } |
1256 | ||
1257 | void ceph_dentry_lru_del(struct dentry *dn) | |
1258 | { | |
1259 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1260 | struct ceph_mds_client *mdsc; | |
1261 | ||
a455589f | 1262 | dout("dentry_lru_del %p %p '%pd'\n", di, dn, dn); |
3d8eb7a9 SW |
1263 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
1264 | spin_lock(&mdsc->dentry_lru_lock); | |
1265 | list_del_init(&di->lru); | |
1266 | mdsc->num_dentry--; | |
1267 | spin_unlock(&mdsc->dentry_lru_lock); | |
2817b000 SW |
1268 | } |
1269 | ||
6c0f3af7 SW |
1270 | /* |
1271 | * Return name hash for a given dentry. This is dependent on | |
1272 | * the parent directory's hash function. | |
1273 | */ | |
e5f86dc3 | 1274 | unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn) |
6c0f3af7 | 1275 | { |
6c0f3af7 SW |
1276 | struct ceph_inode_info *dci = ceph_inode(dir); |
1277 | ||
1278 | switch (dci->i_dir_layout.dl_dir_hash) { | |
1279 | case 0: /* for backward compat */ | |
1280 | case CEPH_STR_HASH_LINUX: | |
1281 | return dn->d_name.hash; | |
1282 | ||
1283 | default: | |
1284 | return ceph_str_hash(dci->i_dir_layout.dl_dir_hash, | |
1285 | dn->d_name.name, dn->d_name.len); | |
1286 | } | |
1287 | } | |
1288 | ||
2817b000 SW |
1289 | const struct file_operations ceph_dir_fops = { |
1290 | .read = ceph_read_dir, | |
77acfa29 | 1291 | .iterate = ceph_readdir, |
2817b000 SW |
1292 | .llseek = ceph_dir_llseek, |
1293 | .open = ceph_open, | |
1294 | .release = ceph_release, | |
1295 | .unlocked_ioctl = ceph_ioctl, | |
da819c81 | 1296 | .fsync = ceph_fsync, |
2817b000 SW |
1297 | }; |
1298 | ||
38c48b5f YZ |
1299 | const struct file_operations ceph_snapdir_fops = { |
1300 | .iterate = ceph_readdir, | |
1301 | .llseek = ceph_dir_llseek, | |
1302 | .open = ceph_open, | |
1303 | .release = ceph_release, | |
1304 | }; | |
1305 | ||
2817b000 SW |
1306 | const struct inode_operations ceph_dir_iops = { |
1307 | .lookup = ceph_lookup, | |
1308 | .permission = ceph_permission, | |
1309 | .getattr = ceph_getattr, | |
1310 | .setattr = ceph_setattr, | |
1311 | .setxattr = ceph_setxattr, | |
1312 | .getxattr = ceph_getxattr, | |
1313 | .listxattr = ceph_listxattr, | |
1314 | .removexattr = ceph_removexattr, | |
7221fe4c | 1315 | .get_acl = ceph_get_acl, |
72466d0b | 1316 | .set_acl = ceph_set_acl, |
2817b000 SW |
1317 | .mknod = ceph_mknod, |
1318 | .symlink = ceph_symlink, | |
1319 | .mkdir = ceph_mkdir, | |
1320 | .link = ceph_link, | |
1321 | .unlink = ceph_unlink, | |
1322 | .rmdir = ceph_unlink, | |
1323 | .rename = ceph_rename, | |
1324 | .create = ceph_create, | |
2d83bde9 | 1325 | .atomic_open = ceph_atomic_open, |
2817b000 SW |
1326 | }; |
1327 | ||
38c48b5f YZ |
1328 | const struct inode_operations ceph_snapdir_iops = { |
1329 | .lookup = ceph_lookup, | |
1330 | .permission = ceph_permission, | |
1331 | .getattr = ceph_getattr, | |
1332 | .mkdir = ceph_mkdir, | |
1333 | .rmdir = ceph_unlink, | |
0ea611a3 | 1334 | .rename = ceph_rename, |
38c48b5f YZ |
1335 | }; |
1336 | ||
52dfb8ac | 1337 | const struct dentry_operations ceph_dentry_ops = { |
2817b000 | 1338 | .d_revalidate = ceph_d_revalidate, |
147851d2 | 1339 | .d_release = ceph_d_release, |
b58dc410 | 1340 | .d_prune = ceph_d_prune, |
2817b000 SW |
1341 | }; |
1342 | ||
52dfb8ac | 1343 | const struct dentry_operations ceph_snapdir_dentry_ops = { |
2817b000 | 1344 | .d_revalidate = ceph_snapdir_d_revalidate, |
147851d2 | 1345 | .d_release = ceph_d_release, |
2817b000 SW |
1346 | }; |
1347 | ||
52dfb8ac | 1348 | const struct dentry_operations ceph_snap_dentry_ops = { |
147851d2 | 1349 | .d_release = ceph_d_release, |
b58dc410 | 1350 | .d_prune = ceph_d_prune, |
2817b000 | 1351 | }; |