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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 | ||
fdd4e158 YZ |
109 | /* |
110 | * make note of the last dentry we read, so we can | |
111 | * continue at the same lexicographical point, | |
112 | * regardless of what dir changes take place on the | |
113 | * server. | |
114 | */ | |
115 | static int note_last_dentry(struct ceph_file_info *fi, const char *name, | |
116 | int len, unsigned next_offset) | |
117 | { | |
118 | char *buf = kmalloc(len+1, GFP_KERNEL); | |
119 | if (!buf) | |
120 | return -ENOMEM; | |
121 | kfree(fi->last_name); | |
122 | fi->last_name = buf; | |
123 | memcpy(fi->last_name, name, len); | |
124 | fi->last_name[len] = 0; | |
125 | fi->next_offset = next_offset; | |
126 | dout("note_last_dentry '%s'\n", fi->last_name); | |
127 | return 0; | |
128 | } | |
129 | ||
2817b000 SW |
130 | /* |
131 | * When possible, we try to satisfy a readdir by peeking at the | |
132 | * dcache. We make this work by carefully ordering dentries on | |
946e51f2 | 133 | * d_child when we initially get results back from the MDS, and |
2817b000 SW |
134 | * falling back to a "normal" sync readdir if any dentries in the dir |
135 | * are dropped. | |
136 | * | |
2f276c51 | 137 | * Complete dir indicates that we have all dentries in the dir. It is |
2817b000 SW |
138 | * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by |
139 | * the MDS if/when the directory is modified). | |
140 | */ | |
a30be7cb YZ |
141 | static int __dcache_readdir(struct file *file, struct dir_context *ctx, |
142 | u32 shared_gen) | |
2817b000 | 143 | { |
77acfa29 | 144 | struct ceph_file_info *fi = file->private_data; |
b583043e | 145 | struct dentry *parent = file->f_path.dentry; |
2b0143b5 | 146 | struct inode *dir = d_inode(parent); |
fdd4e158 | 147 | struct dentry *dentry, *last = NULL; |
2817b000 | 148 | struct ceph_dentry_info *di; |
fdd4e158 | 149 | unsigned nsize = PAGE_CACHE_SIZE / sizeof(struct dentry *); |
2817b000 | 150 | int err = 0; |
fdd4e158 YZ |
151 | loff_t ptr_pos = 0; |
152 | struct ceph_readdir_cache_control cache_ctl = {}; | |
2817b000 | 153 | |
fdd4e158 | 154 | dout("__dcache_readdir %p v%u at %llu\n", dir, shared_gen, ctx->pos); |
2817b000 | 155 | |
fdd4e158 YZ |
156 | /* we can calculate cache index for the first dirfrag */ |
157 | if (ceph_frag_is_leftmost(fpos_frag(ctx->pos))) { | |
158 | cache_ctl.index = fpos_off(ctx->pos) - 2; | |
159 | BUG_ON(cache_ctl.index < 0); | |
160 | ptr_pos = cache_ctl.index * sizeof(struct dentry *); | |
2817b000 SW |
161 | } |
162 | ||
fdd4e158 YZ |
163 | while (true) { |
164 | pgoff_t pgoff; | |
165 | bool emit_dentry; | |
166 | ||
167 | if (ptr_pos >= i_size_read(dir)) { | |
9cfa1098 | 168 | fi->flags |= CEPH_F_ATEND; |
fdd4e158 YZ |
169 | err = 0; |
170 | break; | |
2817b000 | 171 | } |
fdd4e158 YZ |
172 | |
173 | err = -EAGAIN; | |
174 | pgoff = ptr_pos >> PAGE_CACHE_SHIFT; | |
175 | if (!cache_ctl.page || pgoff != page_index(cache_ctl.page)) { | |
176 | ceph_readdir_cache_release(&cache_ctl); | |
177 | cache_ctl.page = find_lock_page(&dir->i_data, pgoff); | |
178 | if (!cache_ctl.page) { | |
179 | dout(" page %lu not found\n", pgoff); | |
180 | break; | |
181 | } | |
182 | /* reading/filling the cache are serialized by | |
183 | * i_mutex, no need to use page lock */ | |
184 | unlock_page(cache_ctl.page); | |
185 | cache_ctl.dentries = kmap(cache_ctl.page); | |
186 | } | |
187 | ||
188 | rcu_read_lock(); | |
189 | spin_lock(&parent->d_lock); | |
190 | /* check i_size again here, because empty directory can be | |
191 | * marked as complete while not holding the i_mutex. */ | |
192 | if (ceph_dir_is_complete_ordered(dir) && | |
193 | ptr_pos < i_size_read(dir)) | |
194 | dentry = cache_ctl.dentries[cache_ctl.index % nsize]; | |
195 | else | |
196 | dentry = NULL; | |
197 | spin_unlock(&parent->d_lock); | |
198 | if (dentry && !lockref_get_not_dead(&dentry->d_lockref)) | |
199 | dentry = NULL; | |
200 | rcu_read_unlock(); | |
201 | if (!dentry) | |
202 | break; | |
203 | ||
204 | emit_dentry = false; | |
205 | di = ceph_dentry(dentry); | |
206 | spin_lock(&dentry->d_lock); | |
a30be7cb | 207 | if (di->lease_shared_gen == shared_gen && |
fdd4e158 | 208 | d_really_is_positive(dentry) && |
2b0143b5 DH |
209 | ceph_snap(d_inode(dentry)) != CEPH_SNAPDIR && |
210 | ceph_ino(d_inode(dentry)) != CEPH_INO_CEPH && | |
fdd4e158 YZ |
211 | fpos_cmp(ctx->pos, di->offset) <= 0) { |
212 | emit_dentry = true; | |
213 | } | |
da502956 | 214 | spin_unlock(&dentry->d_lock); |
2817b000 | 215 | |
fdd4e158 YZ |
216 | if (emit_dentry) { |
217 | dout(" %llu (%llu) dentry %p %pd %p\n", di->offset, ctx->pos, | |
218 | dentry, dentry, d_inode(dentry)); | |
219 | ctx->pos = di->offset; | |
220 | if (!dir_emit(ctx, dentry->d_name.name, | |
221 | dentry->d_name.len, | |
222 | ceph_translate_ino(dentry->d_sb, | |
223 | d_inode(dentry)->i_ino), | |
224 | d_inode(dentry)->i_mode >> 12)) { | |
225 | dput(dentry); | |
226 | err = 0; | |
227 | break; | |
228 | } | |
229 | ctx->pos++; | |
0081bd83 | 230 | |
fdd4e158 YZ |
231 | if (last) |
232 | dput(last); | |
233 | last = dentry; | |
234 | } else { | |
235 | dput(dentry); | |
2817b000 | 236 | } |
f5b06628 | 237 | |
fdd4e158 YZ |
238 | cache_ctl.index++; |
239 | ptr_pos += sizeof(struct dentry *); | |
240 | } | |
241 | ceph_readdir_cache_release(&cache_ctl); | |
242 | if (last) { | |
243 | int ret; | |
244 | di = ceph_dentry(last); | |
245 | ret = note_last_dentry(fi, last->d_name.name, last->d_name.len, | |
246 | fpos_off(di->offset) + 1); | |
247 | if (ret < 0) | |
248 | err = ret; | |
2817b000 | 249 | dput(last); |
fdd4e158 | 250 | } |
2817b000 SW |
251 | return err; |
252 | } | |
253 | ||
77acfa29 | 254 | static int ceph_readdir(struct file *file, struct dir_context *ctx) |
2817b000 | 255 | { |
77acfa29 AV |
256 | struct ceph_file_info *fi = file->private_data; |
257 | struct inode *inode = file_inode(file); | |
2817b000 | 258 | struct ceph_inode_info *ci = ceph_inode(inode); |
3d14c5d2 YS |
259 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
260 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
77acfa29 AV |
261 | unsigned frag = fpos_frag(ctx->pos); |
262 | int off = fpos_off(ctx->pos); | |
2817b000 SW |
263 | int err; |
264 | u32 ftype; | |
265 | struct ceph_mds_reply_info_parsed *rinfo; | |
2817b000 | 266 | |
77acfa29 | 267 | dout("readdir %p file %p frag %u off %u\n", inode, file, frag, off); |
9cfa1098 | 268 | if (fi->flags & CEPH_F_ATEND) |
2817b000 SW |
269 | return 0; |
270 | ||
271 | /* always start with . and .. */ | |
77acfa29 | 272 | if (ctx->pos == 0) { |
2817b000 | 273 | dout("readdir off 0 -> '.'\n"); |
77acfa29 | 274 | if (!dir_emit(ctx, ".", 1, |
ad1fee96 | 275 | ceph_translate_ino(inode->i_sb, inode->i_ino), |
77acfa29 | 276 | inode->i_mode >> 12)) |
2817b000 | 277 | return 0; |
77acfa29 | 278 | ctx->pos = 1; |
2817b000 SW |
279 | off = 1; |
280 | } | |
77acfa29 | 281 | if (ctx->pos == 1) { |
b583043e | 282 | ino_t ino = parent_ino(file->f_path.dentry); |
2817b000 | 283 | dout("readdir off 1 -> '..'\n"); |
77acfa29 | 284 | if (!dir_emit(ctx, "..", 2, |
ad1fee96 | 285 | ceph_translate_ino(inode->i_sb, ino), |
77acfa29 | 286 | inode->i_mode >> 12)) |
2817b000 | 287 | return 0; |
77acfa29 | 288 | ctx->pos = 2; |
2817b000 SW |
289 | off = 2; |
290 | } | |
291 | ||
292 | /* can we use the dcache? */ | |
be655596 | 293 | spin_lock(&ci->i_ceph_lock); |
fdd4e158 | 294 | if (ceph_test_mount_opt(fsc, DCACHE) && |
3d14c5d2 | 295 | !ceph_test_mount_opt(fsc, NOASYNCREADDIR) && |
a0dff78d | 296 | ceph_snap(inode) != CEPH_SNAPDIR && |
70db4f36 | 297 | __ceph_dir_is_complete_ordered(ci) && |
2817b000 | 298 | __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) { |
a30be7cb | 299 | u32 shared_gen = ci->i_shared_gen; |
be655596 | 300 | spin_unlock(&ci->i_ceph_lock); |
a30be7cb | 301 | err = __dcache_readdir(file, ctx, shared_gen); |
efa4c120 | 302 | if (err != -EAGAIN) |
2817b000 | 303 | return err; |
0081bd83 YZ |
304 | frag = fpos_frag(ctx->pos); |
305 | off = fpos_off(ctx->pos); | |
efa4c120 | 306 | } else { |
be655596 | 307 | spin_unlock(&ci->i_ceph_lock); |
2817b000 | 308 | } |
2817b000 SW |
309 | |
310 | /* proceed with a normal readdir */ | |
2817b000 SW |
311 | more: |
312 | /* do we have the correct frag content buffered? */ | |
313 | if (fi->frag != frag || fi->last_readdir == NULL) { | |
314 | struct ceph_mds_request *req; | |
315 | int op = ceph_snap(inode) == CEPH_SNAPDIR ? | |
316 | CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR; | |
317 | ||
318 | /* discard old result, if any */ | |
393f6620 | 319 | if (fi->last_readdir) { |
2817b000 | 320 | ceph_mdsc_put_request(fi->last_readdir); |
393f6620 SW |
321 | fi->last_readdir = NULL; |
322 | } | |
2817b000 | 323 | |
2817b000 SW |
324 | dout("readdir fetching %llx.%llx frag %x offset '%s'\n", |
325 | ceph_vinop(inode), frag, fi->last_name); | |
326 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
327 | if (IS_ERR(req)) | |
328 | return PTR_ERR(req); | |
54008399 YZ |
329 | err = ceph_alloc_readdir_reply_buffer(req, inode); |
330 | if (err) { | |
331 | ceph_mdsc_put_request(req); | |
332 | return err; | |
333 | } | |
2817b000 SW |
334 | /* hints to request -> mds selection code */ |
335 | req->r_direct_mode = USE_AUTH_MDS; | |
336 | req->r_direct_hash = ceph_frag_value(frag); | |
337 | req->r_direct_is_hash = true; | |
a149bb9a | 338 | if (fi->last_name) { |
687265e5 | 339 | req->r_path2 = kstrdup(fi->last_name, GFP_KERNEL); |
a149bb9a SK |
340 | if (!req->r_path2) { |
341 | ceph_mdsc_put_request(req); | |
342 | return -ENOMEM; | |
343 | } | |
344 | } | |
fdd4e158 YZ |
345 | req->r_dir_release_cnt = fi->dir_release_count; |
346 | req->r_dir_ordered_cnt = fi->dir_ordered_count; | |
347 | req->r_readdir_cache_idx = fi->readdir_cache_idx; | |
2817b000 SW |
348 | req->r_readdir_offset = fi->next_offset; |
349 | req->r_args.readdir.frag = cpu_to_le32(frag); | |
a149bb9a SK |
350 | |
351 | req->r_inode = inode; | |
352 | ihold(inode); | |
353 | req->r_dentry = dget(file->f_path.dentry); | |
2817b000 SW |
354 | err = ceph_mdsc_do_request(mdsc, NULL, req); |
355 | if (err < 0) { | |
356 | ceph_mdsc_put_request(req); | |
357 | return err; | |
358 | } | |
359 | dout("readdir got and parsed readdir result=%d" | |
360 | " on frag %x, end=%d, complete=%d\n", err, frag, | |
361 | (int)req->r_reply_info.dir_end, | |
362 | (int)req->r_reply_info.dir_complete); | |
363 | ||
2817b000 SW |
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); | |
fdd4e158 YZ |
369 | off = req->r_readdir_offset; |
370 | fi->next_offset = off; | |
81c6aea5 | 371 | } |
fdd4e158 | 372 | |
f0494206 | 373 | fi->frag = frag; |
2817b000 SW |
374 | fi->offset = fi->next_offset; |
375 | fi->last_readdir = req; | |
376 | ||
fdd4e158 YZ |
377 | if (req->r_did_prepopulate) { |
378 | fi->readdir_cache_idx = req->r_readdir_cache_idx; | |
379 | if (fi->readdir_cache_idx < 0) { | |
380 | /* preclude from marking dir ordered */ | |
381 | fi->dir_ordered_count = 0; | |
382 | } else if (ceph_frag_is_leftmost(frag) && off == 2) { | |
383 | /* note dir version at start of readdir so | |
384 | * we can tell if any dentries get dropped */ | |
385 | fi->dir_release_count = req->r_dir_release_cnt; | |
386 | fi->dir_ordered_count = req->r_dir_ordered_cnt; | |
387 | } | |
388 | } else { | |
389 | dout("readdir !did_prepopulate"); | |
390 | /* disable readdir cache */ | |
391 | fi->readdir_cache_idx = -1; | |
392 | /* preclude from marking dir complete */ | |
393 | fi->dir_release_count = 0; | |
394 | } | |
395 | ||
2817b000 SW |
396 | if (req->r_reply_info.dir_end) { |
397 | kfree(fi->last_name); | |
398 | fi->last_name = NULL; | |
7b88dadc SW |
399 | if (ceph_frag_is_rightmost(frag)) |
400 | fi->next_offset = 2; | |
401 | else | |
402 | fi->next_offset = 0; | |
2817b000 | 403 | } else { |
2817b000 SW |
404 | err = note_last_dentry(fi, |
405 | rinfo->dir_dname[rinfo->dir_nr-1], | |
fdd4e158 YZ |
406 | rinfo->dir_dname_len[rinfo->dir_nr-1], |
407 | fi->next_offset + rinfo->dir_nr); | |
2817b000 SW |
408 | if (err) |
409 | return err; | |
2817b000 SW |
410 | } |
411 | } | |
412 | ||
413 | rinfo = &fi->last_readdir->r_reply_info; | |
414 | dout("readdir frag %x num %d off %d chunkoff %d\n", frag, | |
415 | rinfo->dir_nr, off, fi->offset); | |
77acfa29 AV |
416 | |
417 | ctx->pos = ceph_make_fpos(frag, off); | |
da39822c | 418 | while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) { |
2817b000 SW |
419 | struct ceph_mds_reply_inode *in = |
420 | rinfo->dir_in[off - fi->offset].in; | |
3105c19c SW |
421 | struct ceph_vino vino; |
422 | ino_t ino; | |
423 | ||
2817b000 | 424 | dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n", |
77acfa29 | 425 | off, off - fi->offset, rinfo->dir_nr, ctx->pos, |
2817b000 SW |
426 | rinfo->dir_dname_len[off - fi->offset], |
427 | rinfo->dir_dname[off - fi->offset], in); | |
428 | BUG_ON(!in); | |
429 | ftype = le32_to_cpu(in->mode) >> 12; | |
3105c19c SW |
430 | vino.ino = le64_to_cpu(in->ino); |
431 | vino.snap = le64_to_cpu(in->snapid); | |
432 | ino = ceph_vino_to_ino(vino); | |
77acfa29 | 433 | if (!dir_emit(ctx, |
2817b000 SW |
434 | rinfo->dir_dname[off - fi->offset], |
435 | rinfo->dir_dname_len[off - fi->offset], | |
77acfa29 | 436 | ceph_translate_ino(inode->i_sb, ino), ftype)) { |
2817b000 SW |
437 | dout("filldir stopping us...\n"); |
438 | return 0; | |
439 | } | |
440 | off++; | |
77acfa29 | 441 | ctx->pos++; |
2817b000 SW |
442 | } |
443 | ||
444 | if (fi->last_name) { | |
445 | ceph_mdsc_put_request(fi->last_readdir); | |
446 | fi->last_readdir = NULL; | |
447 | goto more; | |
448 | } | |
449 | ||
450 | /* more frags? */ | |
451 | if (!ceph_frag_is_rightmost(frag)) { | |
452 | frag = ceph_frag_next(frag); | |
453 | off = 0; | |
77acfa29 | 454 | ctx->pos = ceph_make_fpos(frag, off); |
2817b000 SW |
455 | dout("readdir next frag is %x\n", frag); |
456 | goto more; | |
457 | } | |
9cfa1098 | 458 | fi->flags |= CEPH_F_ATEND; |
2817b000 SW |
459 | |
460 | /* | |
461 | * if dir_release_count still matches the dir, no dentries | |
462 | * were released during the whole readdir, and we should have | |
463 | * the complete dir contents in our cache. | |
464 | */ | |
fdd4e158 YZ |
465 | if (atomic64_read(&ci->i_release_count) == fi->dir_release_count) { |
466 | spin_lock(&ci->i_ceph_lock); | |
467 | if (fi->dir_ordered_count == atomic64_read(&ci->i_ordered_count)) { | |
70db4f36 | 468 | dout(" marking %p complete and ordered\n", inode); |
fdd4e158 YZ |
469 | /* use i_size to track number of entries in |
470 | * readdir cache */ | |
471 | BUG_ON(fi->readdir_cache_idx < 0); | |
472 | i_size_write(inode, fi->readdir_cache_idx * | |
473 | sizeof(struct dentry*)); | |
474 | } else { | |
70db4f36 | 475 | dout(" marking %p complete\n", inode); |
fdd4e158 | 476 | } |
70db4f36 YZ |
477 | __ceph_dir_set_complete(ci, fi->dir_release_count, |
478 | fi->dir_ordered_count); | |
fdd4e158 | 479 | spin_unlock(&ci->i_ceph_lock); |
2817b000 | 480 | } |
2817b000 | 481 | |
77acfa29 | 482 | dout("readdir %p file %p done.\n", inode, file); |
2817b000 SW |
483 | return 0; |
484 | } | |
485 | ||
dcd3cc05 | 486 | static void reset_readdir(struct ceph_file_info *fi, unsigned frag) |
2817b000 SW |
487 | { |
488 | if (fi->last_readdir) { | |
489 | ceph_mdsc_put_request(fi->last_readdir); | |
490 | fi->last_readdir = NULL; | |
491 | } | |
492 | kfree(fi->last_name); | |
a1629c3b | 493 | fi->last_name = NULL; |
fdd4e158 YZ |
494 | fi->dir_release_count = 0; |
495 | fi->readdir_cache_idx = -1; | |
dcd3cc05 YZ |
496 | if (ceph_frag_is_leftmost(frag)) |
497 | fi->next_offset = 2; /* compensate for . and .. */ | |
498 | else | |
499 | fi->next_offset = 0; | |
9cfa1098 | 500 | fi->flags &= ~CEPH_F_ATEND; |
2817b000 SW |
501 | } |
502 | ||
965c8e59 | 503 | static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence) |
2817b000 SW |
504 | { |
505 | struct ceph_file_info *fi = file->private_data; | |
506 | struct inode *inode = file->f_mapping->host; | |
f0494206 | 507 | loff_t old_offset = ceph_make_fpos(fi->frag, fi->next_offset); |
2817b000 SW |
508 | loff_t retval; |
509 | ||
510 | mutex_lock(&inode->i_mutex); | |
06222e49 | 511 | retval = -EINVAL; |
965c8e59 | 512 | switch (whence) { |
2817b000 SW |
513 | case SEEK_CUR: |
514 | offset += file->f_pos; | |
06222e49 JB |
515 | case SEEK_SET: |
516 | break; | |
fdd4e158 YZ |
517 | case SEEK_END: |
518 | retval = -EOPNOTSUPP; | |
06222e49 JB |
519 | default: |
520 | goto out; | |
2817b000 | 521 | } |
06222e49 | 522 | |
f0494206 | 523 | if (offset >= 0) { |
2817b000 SW |
524 | if (offset != file->f_pos) { |
525 | file->f_pos = offset; | |
526 | file->f_version = 0; | |
9cfa1098 | 527 | fi->flags &= ~CEPH_F_ATEND; |
2817b000 SW |
528 | } |
529 | retval = offset; | |
530 | ||
2817b000 | 531 | if (offset == 0 || |
f0494206 | 532 | fpos_frag(offset) != fi->frag || |
2817b000 | 533 | fpos_off(offset) < fi->offset) { |
fdd4e158 YZ |
534 | /* discard buffered readdir content on seekdir(0), or |
535 | * seek to new frag, or seek prior to current chunk */ | |
2817b000 | 536 | dout("dir_llseek dropping %p content\n", file); |
dcd3cc05 | 537 | reset_readdir(fi, fpos_frag(offset)); |
fdd4e158 YZ |
538 | } else if (fpos_cmp(offset, old_offset) > 0) { |
539 | /* reset dir_release_count if we did a forward seek */ | |
540 | fi->dir_release_count = 0; | |
541 | fi->readdir_cache_idx = -1; | |
2817b000 | 542 | } |
2817b000 | 543 | } |
06222e49 | 544 | out: |
2817b000 SW |
545 | mutex_unlock(&inode->i_mutex); |
546 | return retval; | |
547 | } | |
548 | ||
549 | /* | |
468640e3 | 550 | * Handle lookups for the hidden .snap directory. |
2817b000 | 551 | */ |
468640e3 SW |
552 | int ceph_handle_snapdir(struct ceph_mds_request *req, |
553 | struct dentry *dentry, int err) | |
2817b000 | 554 | { |
3d14c5d2 | 555 | struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); |
2b0143b5 | 556 | struct inode *parent = d_inode(dentry->d_parent); /* we hold i_mutex */ |
2817b000 SW |
557 | |
558 | /* .snap dir? */ | |
559 | if (err == -ENOENT && | |
455cec0a | 560 | ceph_snap(parent) == CEPH_NOSNAP && |
6b805185 | 561 | strcmp(dentry->d_name.name, |
3d14c5d2 | 562 | fsc->mount_options->snapdir_name) == 0) { |
2817b000 | 563 | struct inode *inode = ceph_get_snapdir(parent); |
a455589f AV |
564 | dout("ENOENT on snapdir %p '%pd', linking to snapdir %p\n", |
565 | dentry, dentry, inode); | |
9358c6d4 | 566 | BUG_ON(!d_unhashed(dentry)); |
2817b000 SW |
567 | d_add(dentry, inode); |
568 | err = 0; | |
569 | } | |
468640e3 SW |
570 | return err; |
571 | } | |
2817b000 | 572 | |
468640e3 SW |
573 | /* |
574 | * Figure out final result of a lookup/open request. | |
575 | * | |
576 | * Mainly, make sure we return the final req->r_dentry (if it already | |
577 | * existed) in place of the original VFS-provided dentry when they | |
578 | * differ. | |
579 | * | |
580 | * Gracefully handle the case where the MDS replies with -ENOENT and | |
581 | * no trace (which it may do, at its discretion, e.g., if it doesn't | |
582 | * care to issue a lease on the negative dentry). | |
583 | */ | |
584 | struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, | |
585 | struct dentry *dentry, int err) | |
586 | { | |
2817b000 SW |
587 | if (err == -ENOENT) { |
588 | /* no trace? */ | |
589 | err = 0; | |
590 | if (!req->r_reply_info.head->is_dentry) { | |
591 | dout("ENOENT and no trace, dentry %p inode %p\n", | |
2b0143b5 DH |
592 | dentry, d_inode(dentry)); |
593 | if (d_really_is_positive(dentry)) { | |
2817b000 SW |
594 | d_drop(dentry); |
595 | err = -ENOENT; | |
596 | } else { | |
597 | d_add(dentry, NULL); | |
598 | } | |
599 | } | |
600 | } | |
601 | if (err) | |
602 | dentry = ERR_PTR(err); | |
603 | else if (dentry != req->r_dentry) | |
604 | dentry = dget(req->r_dentry); /* we got spliced */ | |
605 | else | |
606 | dentry = NULL; | |
607 | return dentry; | |
608 | } | |
609 | ||
1d1de916 SW |
610 | static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry) |
611 | { | |
612 | return ceph_ino(inode) == CEPH_INO_ROOT && | |
613 | strncmp(dentry->d_name.name, ".ceph", 5) == 0; | |
614 | } | |
615 | ||
2817b000 SW |
616 | /* |
617 | * Look up a single dir entry. If there is a lookup intent, inform | |
618 | * the MDS so that it gets our 'caps wanted' value in a single op. | |
619 | */ | |
620 | static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry, | |
00cd8dd3 | 621 | unsigned int flags) |
2817b000 | 622 | { |
3d14c5d2 YS |
623 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
624 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
625 | struct ceph_mds_request *req; |
626 | int op; | |
627 | int err; | |
628 | ||
a455589f AV |
629 | dout("lookup %p dentry %p '%pd'\n", |
630 | dir, dentry, dentry); | |
2817b000 SW |
631 | |
632 | if (dentry->d_name.len > NAME_MAX) | |
633 | return ERR_PTR(-ENAMETOOLONG); | |
634 | ||
635 | err = ceph_init_dentry(dentry); | |
636 | if (err < 0) | |
637 | return ERR_PTR(err); | |
638 | ||
2817b000 | 639 | /* can we conclude ENOENT locally? */ |
2b0143b5 | 640 | if (d_really_is_negative(dentry)) { |
2817b000 SW |
641 | struct ceph_inode_info *ci = ceph_inode(dir); |
642 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
643 | ||
be655596 | 644 | spin_lock(&ci->i_ceph_lock); |
2817b000 SW |
645 | dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags); |
646 | if (strncmp(dentry->d_name.name, | |
3d14c5d2 | 647 | fsc->mount_options->snapdir_name, |
2817b000 | 648 | dentry->d_name.len) && |
1d1de916 | 649 | !is_root_ceph_dentry(dir, dentry) && |
e2c3de04 | 650 | ceph_test_mount_opt(fsc, DCACHE) && |
2f276c51 | 651 | __ceph_dir_is_complete(ci) && |
2817b000 | 652 | (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) { |
be655596 | 653 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
654 | dout(" dir %p complete, -ENOENT\n", dir); |
655 | d_add(dentry, NULL); | |
656 | di->lease_shared_gen = ci->i_shared_gen; | |
657 | return NULL; | |
658 | } | |
be655596 | 659 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
660 | } |
661 | ||
662 | op = ceph_snap(dir) == CEPH_SNAPDIR ? | |
663 | CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; | |
664 | req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); | |
665 | if (IS_ERR(req)) | |
7e34bc52 | 666 | return ERR_CAST(req); |
2817b000 SW |
667 | req->r_dentry = dget(dentry); |
668 | req->r_num_caps = 2; | |
669 | /* we only need inode linkage */ | |
670 | req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); | |
671 | req->r_locked_dir = dir; | |
672 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
468640e3 | 673 | err = ceph_handle_snapdir(req, dentry, err); |
2817b000 SW |
674 | dentry = ceph_finish_lookup(req, dentry, err); |
675 | ceph_mdsc_put_request(req); /* will dput(dentry) */ | |
676 | dout("lookup result=%p\n", dentry); | |
677 | return dentry; | |
678 | } | |
679 | ||
680 | /* | |
681 | * If we do a create but get no trace back from the MDS, follow up with | |
682 | * a lookup (the VFS expects us to link up the provided dentry). | |
683 | */ | |
684 | int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry) | |
685 | { | |
00cd8dd3 | 686 | struct dentry *result = ceph_lookup(dir, dentry, 0); |
2817b000 SW |
687 | |
688 | if (result && !IS_ERR(result)) { | |
689 | /* | |
690 | * We created the item, then did a lookup, and found | |
691 | * it was already linked to another inode we already | |
4d41cef2 YZ |
692 | * had in our cache (and thus got spliced). To not |
693 | * confuse VFS (especially when inode is a directory), | |
694 | * we don't link our dentry to that inode, return an | |
695 | * error instead. | |
696 | * | |
697 | * This event should be rare and it happens only when | |
698 | * we talk to old MDS. Recent MDS does not send traceless | |
699 | * reply for request that creates new inode. | |
2817b000 | 700 | */ |
5cba372c | 701 | d_drop(result); |
4d41cef2 | 702 | return -ESTALE; |
2817b000 SW |
703 | } |
704 | return PTR_ERR(result); | |
705 | } | |
706 | ||
707 | static int ceph_mknod(struct inode *dir, struct dentry *dentry, | |
1a67aafb | 708 | umode_t mode, dev_t rdev) |
2817b000 | 709 | { |
3d14c5d2 YS |
710 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
711 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 | 712 | struct ceph_mds_request *req; |
b1ee94aa | 713 | struct ceph_acls_info acls = {}; |
2817b000 SW |
714 | int err; |
715 | ||
716 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
717 | return -EROFS; | |
718 | ||
b1ee94aa YZ |
719 | err = ceph_pre_init_acls(dir, &mode, &acls); |
720 | if (err < 0) | |
721 | return err; | |
722 | ||
1a67aafb | 723 | dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n", |
2817b000 SW |
724 | dir, dentry, mode, rdev); |
725 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS); | |
726 | if (IS_ERR(req)) { | |
b1ee94aa YZ |
727 | err = PTR_ERR(req); |
728 | goto out; | |
2817b000 SW |
729 | } |
730 | req->r_dentry = dget(dentry); | |
731 | req->r_num_caps = 2; | |
732 | req->r_locked_dir = dir; | |
733 | req->r_args.mknod.mode = cpu_to_le32(mode); | |
734 | req->r_args.mknod.rdev = cpu_to_le32(rdev); | |
735 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
736 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
b1ee94aa YZ |
737 | if (acls.pagelist) { |
738 | req->r_pagelist = acls.pagelist; | |
739 | acls.pagelist = NULL; | |
740 | } | |
2817b000 SW |
741 | err = ceph_mdsc_do_request(mdsc, dir, req); |
742 | if (!err && !req->r_reply_info.head->is_dentry) | |
743 | err = ceph_handle_notrace_create(dir, dentry); | |
744 | ceph_mdsc_put_request(req); | |
b1ee94aa | 745 | out: |
7221fe4c | 746 | if (!err) |
2b0143b5 | 747 | ceph_init_inode_acls(d_inode(dentry), &acls); |
b20a95a0 | 748 | else |
2817b000 | 749 | d_drop(dentry); |
b1ee94aa | 750 | ceph_release_acls_info(&acls); |
2817b000 SW |
751 | return err; |
752 | } | |
753 | ||
4acdaf27 | 754 | static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 755 | bool excl) |
2817b000 | 756 | { |
2d83bde9 | 757 | return ceph_mknod(dir, dentry, mode, 0); |
2817b000 SW |
758 | } |
759 | ||
760 | static int ceph_symlink(struct inode *dir, struct dentry *dentry, | |
761 | const char *dest) | |
762 | { | |
3d14c5d2 YS |
763 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
764 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
765 | struct ceph_mds_request *req; |
766 | int err; | |
767 | ||
768 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
769 | return -EROFS; | |
770 | ||
771 | dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest); | |
772 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS); | |
773 | if (IS_ERR(req)) { | |
b1ee94aa YZ |
774 | err = PTR_ERR(req); |
775 | goto out; | |
2817b000 | 776 | } |
687265e5 | 777 | req->r_path2 = kstrdup(dest, GFP_KERNEL); |
a149bb9a SK |
778 | if (!req->r_path2) { |
779 | err = -ENOMEM; | |
780 | ceph_mdsc_put_request(req); | |
781 | goto out; | |
782 | } | |
2817b000 | 783 | req->r_locked_dir = dir; |
a149bb9a SK |
784 | req->r_dentry = dget(dentry); |
785 | req->r_num_caps = 2; | |
2817b000 SW |
786 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; |
787 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
788 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
789 | if (!err && !req->r_reply_info.head->is_dentry) | |
790 | err = ceph_handle_notrace_create(dir, dentry); | |
791 | ceph_mdsc_put_request(req); | |
b1ee94aa YZ |
792 | out: |
793 | if (err) | |
2817b000 SW |
794 | d_drop(dentry); |
795 | return err; | |
796 | } | |
797 | ||
18bb1db3 | 798 | static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
2817b000 | 799 | { |
3d14c5d2 YS |
800 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
801 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 | 802 | struct ceph_mds_request *req; |
b1ee94aa | 803 | struct ceph_acls_info acls = {}; |
2817b000 SW |
804 | int err = -EROFS; |
805 | int op; | |
806 | ||
807 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
808 | /* mkdir .snap/foo is a MKSNAP */ | |
809 | op = CEPH_MDS_OP_MKSNAP; | |
a455589f AV |
810 | dout("mksnap dir %p snap '%pd' dn %p\n", dir, |
811 | dentry, dentry); | |
2817b000 | 812 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { |
18bb1db3 | 813 | dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode); |
2817b000 SW |
814 | op = CEPH_MDS_OP_MKDIR; |
815 | } else { | |
816 | goto out; | |
817 | } | |
b1ee94aa YZ |
818 | |
819 | mode |= S_IFDIR; | |
820 | err = ceph_pre_init_acls(dir, &mode, &acls); | |
821 | if (err < 0) | |
822 | goto out; | |
823 | ||
2817b000 SW |
824 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); |
825 | if (IS_ERR(req)) { | |
826 | err = PTR_ERR(req); | |
827 | goto out; | |
828 | } | |
829 | ||
830 | req->r_dentry = dget(dentry); | |
831 | req->r_num_caps = 2; | |
832 | req->r_locked_dir = dir; | |
833 | req->r_args.mkdir.mode = cpu_to_le32(mode); | |
834 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
835 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
b1ee94aa YZ |
836 | if (acls.pagelist) { |
837 | req->r_pagelist = acls.pagelist; | |
838 | acls.pagelist = NULL; | |
839 | } | |
2817b000 | 840 | err = ceph_mdsc_do_request(mdsc, dir, req); |
275dd19e YZ |
841 | if (!err && |
842 | !req->r_reply_info.head->is_target && | |
843 | !req->r_reply_info.head->is_dentry) | |
2817b000 SW |
844 | err = ceph_handle_notrace_create(dir, dentry); |
845 | ceph_mdsc_put_request(req); | |
846 | out: | |
b20a95a0 | 847 | if (!err) |
2b0143b5 | 848 | ceph_init_inode_acls(d_inode(dentry), &acls); |
b20a95a0 | 849 | else |
2817b000 | 850 | d_drop(dentry); |
b1ee94aa | 851 | ceph_release_acls_info(&acls); |
2817b000 SW |
852 | return err; |
853 | } | |
854 | ||
855 | static int ceph_link(struct dentry *old_dentry, struct inode *dir, | |
856 | struct dentry *dentry) | |
857 | { | |
3d14c5d2 YS |
858 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
859 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
860 | struct ceph_mds_request *req; |
861 | int err; | |
862 | ||
863 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
864 | return -EROFS; | |
865 | ||
866 | dout("link in dir %p old_dentry %p dentry %p\n", dir, | |
867 | old_dentry, dentry); | |
868 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS); | |
869 | if (IS_ERR(req)) { | |
870 | d_drop(dentry); | |
871 | return PTR_ERR(req); | |
872 | } | |
873 | req->r_dentry = dget(dentry); | |
874 | req->r_num_caps = 2; | |
4b58c9b1 | 875 | req->r_old_dentry = dget(old_dentry); |
2817b000 SW |
876 | req->r_locked_dir = dir; |
877 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
878 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
ad88f23f YZ |
879 | /* release LINK_SHARED on source inode (mds will lock it) */ |
880 | req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; | |
2817b000 | 881 | err = ceph_mdsc_do_request(mdsc, dir, req); |
70b666c3 | 882 | if (err) { |
2817b000 | 883 | d_drop(dentry); |
70b666c3 | 884 | } else if (!req->r_reply_info.head->is_dentry) { |
2b0143b5 DH |
885 | ihold(d_inode(old_dentry)); |
886 | d_instantiate(dentry, d_inode(old_dentry)); | |
70b666c3 | 887 | } |
2817b000 SW |
888 | ceph_mdsc_put_request(req); |
889 | return err; | |
890 | } | |
891 | ||
892 | /* | |
893 | * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it | |
894 | * looks like the link count will hit 0, drop any other caps (other | |
895 | * than PIN) we don't specifically want (due to the file still being | |
896 | * open). | |
897 | */ | |
898 | static int drop_caps_for_unlink(struct inode *inode) | |
899 | { | |
900 | struct ceph_inode_info *ci = ceph_inode(inode); | |
901 | int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; | |
902 | ||
be655596 | 903 | spin_lock(&ci->i_ceph_lock); |
2817b000 SW |
904 | if (inode->i_nlink == 1) { |
905 | drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN); | |
906 | ci->i_ceph_flags |= CEPH_I_NODELAY; | |
907 | } | |
be655596 | 908 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
909 | return drop; |
910 | } | |
911 | ||
912 | /* | |
913 | * rmdir and unlink are differ only by the metadata op code | |
914 | */ | |
915 | static int ceph_unlink(struct inode *dir, struct dentry *dentry) | |
916 | { | |
3d14c5d2 YS |
917 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
918 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2b0143b5 | 919 | struct inode *inode = d_inode(dentry); |
2817b000 SW |
920 | struct ceph_mds_request *req; |
921 | int err = -EROFS; | |
922 | int op; | |
923 | ||
924 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
925 | /* rmdir .snap/foo is RMSNAP */ | |
a455589f | 926 | dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry); |
2817b000 SW |
927 | op = CEPH_MDS_OP_RMSNAP; |
928 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { | |
929 | dout("unlink/rmdir dir %p dn %p inode %p\n", | |
930 | dir, dentry, inode); | |
e36cb0b8 | 931 | op = d_is_dir(dentry) ? |
2817b000 SW |
932 | CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK; |
933 | } else | |
934 | goto out; | |
935 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
936 | if (IS_ERR(req)) { | |
937 | err = PTR_ERR(req); | |
938 | goto out; | |
939 | } | |
940 | req->r_dentry = dget(dentry); | |
941 | req->r_num_caps = 2; | |
942 | req->r_locked_dir = dir; | |
943 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
944 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
945 | req->r_inode_drop = drop_caps_for_unlink(inode); | |
946 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
947 | if (!err && !req->r_reply_info.head->is_dentry) | |
948 | d_delete(dentry); | |
949 | ceph_mdsc_put_request(req); | |
950 | out: | |
951 | return err; | |
952 | } | |
953 | ||
954 | static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry, | |
955 | struct inode *new_dir, struct dentry *new_dentry) | |
956 | { | |
3d14c5d2 YS |
957 | struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb); |
958 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 | 959 | struct ceph_mds_request *req; |
0ea611a3 | 960 | int op = CEPH_MDS_OP_RENAME; |
2817b000 SW |
961 | int err; |
962 | ||
963 | if (ceph_snap(old_dir) != ceph_snap(new_dir)) | |
964 | return -EXDEV; | |
0ea611a3 YZ |
965 | if (ceph_snap(old_dir) != CEPH_NOSNAP) { |
966 | if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR) | |
967 | op = CEPH_MDS_OP_RENAMESNAP; | |
968 | else | |
969 | return -EROFS; | |
970 | } | |
2817b000 SW |
971 | dout("rename dir %p dentry %p to dir %p dentry %p\n", |
972 | old_dir, old_dentry, new_dir, new_dentry); | |
0ea611a3 | 973 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); |
2817b000 SW |
974 | if (IS_ERR(req)) |
975 | return PTR_ERR(req); | |
180061a5 | 976 | ihold(old_dir); |
2817b000 SW |
977 | req->r_dentry = dget(new_dentry); |
978 | req->r_num_caps = 2; | |
979 | req->r_old_dentry = dget(old_dentry); | |
180061a5 | 980 | req->r_old_dentry_dir = old_dir; |
2817b000 SW |
981 | req->r_locked_dir = new_dir; |
982 | req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED; | |
983 | req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL; | |
984 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
985 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
986 | /* release LINK_RDCACHE on source inode (mds will lock it) */ | |
987 | req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; | |
2b0143b5 DH |
988 | if (d_really_is_positive(new_dentry)) |
989 | req->r_inode_drop = drop_caps_for_unlink(d_inode(new_dentry)); | |
2817b000 SW |
990 | err = ceph_mdsc_do_request(mdsc, old_dir, req); |
991 | if (!err && !req->r_reply_info.head->is_dentry) { | |
992 | /* | |
993 | * Normally d_move() is done by fill_trace (called by | |
994 | * do_request, above). If there is no trace, we need | |
995 | * to do it here. | |
996 | */ | |
ea1409f9 | 997 | |
fdd4e158 YZ |
998 | /* d_move screws up sibling dentries' offsets */ |
999 | ceph_dir_clear_complete(old_dir); | |
1000 | ceph_dir_clear_complete(new_dir); | |
1001 | ||
2817b000 | 1002 | d_move(old_dentry, new_dentry); |
ea1409f9 SW |
1003 | |
1004 | /* ensure target dentry is invalidated, despite | |
1005 | rehashing bug in vfs_rename_dir */ | |
81a6cf2d | 1006 | ceph_invalidate_dentry_lease(new_dentry); |
2817b000 SW |
1007 | } |
1008 | ceph_mdsc_put_request(req); | |
1009 | return err; | |
1010 | } | |
1011 | ||
81a6cf2d SW |
1012 | /* |
1013 | * Ensure a dentry lease will no longer revalidate. | |
1014 | */ | |
1015 | void ceph_invalidate_dentry_lease(struct dentry *dentry) | |
1016 | { | |
1017 | spin_lock(&dentry->d_lock); | |
1018 | dentry->d_time = jiffies; | |
1019 | ceph_dentry(dentry)->lease_shared_gen = 0; | |
1020 | spin_unlock(&dentry->d_lock); | |
1021 | } | |
2817b000 SW |
1022 | |
1023 | /* | |
1024 | * Check if dentry lease is valid. If not, delete the lease. Try to | |
1025 | * renew if the least is more than half up. | |
1026 | */ | |
1027 | static int dentry_lease_is_valid(struct dentry *dentry) | |
1028 | { | |
1029 | struct ceph_dentry_info *di; | |
1030 | struct ceph_mds_session *s; | |
1031 | int valid = 0; | |
1032 | u32 gen; | |
1033 | unsigned long ttl; | |
1034 | struct ceph_mds_session *session = NULL; | |
1035 | struct inode *dir = NULL; | |
1036 | u32 seq = 0; | |
1037 | ||
1038 | spin_lock(&dentry->d_lock); | |
1039 | di = ceph_dentry(dentry); | |
3d8eb7a9 | 1040 | if (di->lease_session) { |
2817b000 | 1041 | s = di->lease_session; |
d8fb02ab | 1042 | spin_lock(&s->s_gen_ttl_lock); |
2817b000 SW |
1043 | gen = s->s_cap_gen; |
1044 | ttl = s->s_cap_ttl; | |
d8fb02ab | 1045 | spin_unlock(&s->s_gen_ttl_lock); |
2817b000 SW |
1046 | |
1047 | if (di->lease_gen == gen && | |
1048 | time_before(jiffies, dentry->d_time) && | |
1049 | time_before(jiffies, ttl)) { | |
1050 | valid = 1; | |
1051 | if (di->lease_renew_after && | |
1052 | time_after(jiffies, di->lease_renew_after)) { | |
1053 | /* we should renew */ | |
2b0143b5 | 1054 | dir = d_inode(dentry->d_parent); |
2817b000 SW |
1055 | session = ceph_get_mds_session(s); |
1056 | seq = di->lease_seq; | |
1057 | di->lease_renew_after = 0; | |
1058 | di->lease_renew_from = jiffies; | |
1059 | } | |
2817b000 SW |
1060 | } |
1061 | } | |
1062 | spin_unlock(&dentry->d_lock); | |
1063 | ||
1064 | if (session) { | |
1065 | ceph_mdsc_lease_send_msg(session, dir, dentry, | |
1066 | CEPH_MDS_LEASE_RENEW, seq); | |
1067 | ceph_put_mds_session(session); | |
1068 | } | |
1069 | dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid); | |
1070 | return valid; | |
1071 | } | |
1072 | ||
1073 | /* | |
1074 | * Check if directory-wide content lease/cap is valid. | |
1075 | */ | |
1076 | static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry) | |
1077 | { | |
1078 | struct ceph_inode_info *ci = ceph_inode(dir); | |
1079 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
1080 | int valid = 0; | |
1081 | ||
be655596 | 1082 | spin_lock(&ci->i_ceph_lock); |
2817b000 SW |
1083 | if (ci->i_shared_gen == di->lease_shared_gen) |
1084 | valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1); | |
be655596 | 1085 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
1086 | dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n", |
1087 | dir, (unsigned)ci->i_shared_gen, dentry, | |
1088 | (unsigned)di->lease_shared_gen, valid); | |
1089 | return valid; | |
1090 | } | |
1091 | ||
1092 | /* | |
1093 | * Check if cached dentry can be trusted. | |
1094 | */ | |
0b728e19 | 1095 | static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags) |
2817b000 | 1096 | { |
bf1c6aca | 1097 | int valid = 0; |
34286d66 NP |
1098 | struct inode *dir; |
1099 | ||
0b728e19 | 1100 | if (flags & LOOKUP_RCU) |
34286d66 NP |
1101 | return -ECHILD; |
1102 | ||
a455589f | 1103 | dout("d_revalidate %p '%pd' inode %p offset %lld\n", dentry, |
2b0143b5 | 1104 | dentry, d_inode(dentry), ceph_dentry(dentry)->offset); |
2817b000 | 1105 | |
bf1c6aca SW |
1106 | dir = ceph_get_dentry_parent_inode(dentry); |
1107 | ||
2817b000 SW |
1108 | /* always trust cached snapped dentries, snapdir dentry */ |
1109 | if (ceph_snap(dir) != CEPH_NOSNAP) { | |
a455589f | 1110 | dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry, |
2b0143b5 | 1111 | dentry, d_inode(dentry)); |
bf1c6aca | 1112 | valid = 1; |
2b0143b5 DH |
1113 | } else if (d_really_is_positive(dentry) && |
1114 | ceph_snap(d_inode(dentry)) == CEPH_SNAPDIR) { | |
bf1c6aca SW |
1115 | valid = 1; |
1116 | } else if (dentry_lease_is_valid(dentry) || | |
1117 | dir_lease_is_valid(dir, dentry)) { | |
2b0143b5 DH |
1118 | if (d_really_is_positive(dentry)) |
1119 | valid = ceph_is_any_caps(d_inode(dentry)); | |
9215aeea YZ |
1120 | else |
1121 | valid = 1; | |
2817b000 | 1122 | } |
2817b000 | 1123 | |
bf1c6aca | 1124 | dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid"); |
9215aeea | 1125 | if (valid) { |
bf1c6aca | 1126 | ceph_dentry_lru_touch(dentry); |
9215aeea YZ |
1127 | } else { |
1128 | ceph_dir_clear_complete(dir); | |
9215aeea | 1129 | } |
bf1c6aca SW |
1130 | iput(dir); |
1131 | return valid; | |
2817b000 SW |
1132 | } |
1133 | ||
1134 | /* | |
147851d2 | 1135 | * Release our ceph_dentry_info. |
2817b000 | 1136 | */ |
147851d2 | 1137 | static void ceph_d_release(struct dentry *dentry) |
2817b000 SW |
1138 | { |
1139 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
2817b000 | 1140 | |
147851d2 | 1141 | dout("d_release %p\n", dentry); |
3d8eb7a9 SW |
1142 | ceph_dentry_lru_del(dentry); |
1143 | if (di->lease_session) | |
1144 | ceph_put_mds_session(di->lease_session); | |
1145 | kmem_cache_free(ceph_dentry_cachep, di); | |
1146 | dentry->d_fsdata = NULL; | |
2817b000 SW |
1147 | } |
1148 | ||
1149 | static int ceph_snapdir_d_revalidate(struct dentry *dentry, | |
0b728e19 | 1150 | unsigned int flags) |
2817b000 SW |
1151 | { |
1152 | /* | |
1153 | * Eventually, we'll want to revalidate snapped metadata | |
1154 | * too... probably... | |
1155 | */ | |
1156 | return 1; | |
1157 | } | |
1158 | ||
b58dc410 SW |
1159 | /* |
1160 | * When the VFS prunes a dentry from the cache, we need to clear the | |
1161 | * complete flag on the parent directory. | |
1162 | * | |
1163 | * Called under dentry->d_lock. | |
1164 | */ | |
1165 | static void ceph_d_prune(struct dentry *dentry) | |
1166 | { | |
774ac21d | 1167 | dout("ceph_d_prune %p\n", dentry); |
b58dc410 SW |
1168 | |
1169 | /* do we have a valid parent? */ | |
8842b3be | 1170 | if (IS_ROOT(dentry)) |
b58dc410 SW |
1171 | return; |
1172 | ||
2f276c51 | 1173 | /* if we are not hashed, we don't affect dir's completeness */ |
b58dc410 SW |
1174 | if (d_unhashed(dentry)) |
1175 | return; | |
2817b000 | 1176 | |
b58dc410 SW |
1177 | /* |
1178 | * we hold d_lock, so d_parent is stable, and d_fsdata is never | |
1179 | * cleared until d_release | |
1180 | */ | |
2b0143b5 | 1181 | ceph_dir_clear_complete(d_inode(dentry->d_parent)); |
b58dc410 | 1182 | } |
2817b000 SW |
1183 | |
1184 | /* | |
1185 | * read() on a dir. This weird interface hack only works if mounted | |
1186 | * with '-o dirstat'. | |
1187 | */ | |
1188 | static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, | |
1189 | loff_t *ppos) | |
1190 | { | |
1191 | struct ceph_file_info *cf = file->private_data; | |
496ad9aa | 1192 | struct inode *inode = file_inode(file); |
2817b000 SW |
1193 | struct ceph_inode_info *ci = ceph_inode(inode); |
1194 | int left; | |
ae598083 | 1195 | const int bufsize = 1024; |
2817b000 | 1196 | |
3d14c5d2 | 1197 | if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT)) |
2817b000 SW |
1198 | return -EISDIR; |
1199 | ||
1200 | if (!cf->dir_info) { | |
687265e5 | 1201 | cf->dir_info = kmalloc(bufsize, GFP_KERNEL); |
2817b000 SW |
1202 | if (!cf->dir_info) |
1203 | return -ENOMEM; | |
1204 | cf->dir_info_len = | |
ae598083 | 1205 | snprintf(cf->dir_info, bufsize, |
2817b000 SW |
1206 | "entries: %20lld\n" |
1207 | " files: %20lld\n" | |
1208 | " subdirs: %20lld\n" | |
1209 | "rentries: %20lld\n" | |
1210 | " rfiles: %20lld\n" | |
1211 | " rsubdirs: %20lld\n" | |
1212 | "rbytes: %20lld\n" | |
1213 | "rctime: %10ld.%09ld\n", | |
1214 | ci->i_files + ci->i_subdirs, | |
1215 | ci->i_files, | |
1216 | ci->i_subdirs, | |
1217 | ci->i_rfiles + ci->i_rsubdirs, | |
1218 | ci->i_rfiles, | |
1219 | ci->i_rsubdirs, | |
1220 | ci->i_rbytes, | |
1221 | (long)ci->i_rctime.tv_sec, | |
1222 | (long)ci->i_rctime.tv_nsec); | |
1223 | } | |
1224 | ||
1225 | if (*ppos >= cf->dir_info_len) | |
1226 | return 0; | |
1227 | size = min_t(unsigned, size, cf->dir_info_len-*ppos); | |
1228 | left = copy_to_user(buf, cf->dir_info + *ppos, size); | |
1229 | if (left == size) | |
1230 | return -EFAULT; | |
1231 | *ppos += (size - left); | |
1232 | return size - left; | |
1233 | } | |
1234 | ||
2817b000 SW |
1235 | /* |
1236 | * We maintain a private dentry LRU. | |
1237 | * | |
1238 | * FIXME: this needs to be changed to a per-mds lru to be useful. | |
1239 | */ | |
1240 | void ceph_dentry_lru_add(struct dentry *dn) | |
1241 | { | |
1242 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1243 | struct ceph_mds_client *mdsc; | |
2817b000 | 1244 | |
a455589f | 1245 | dout("dentry_lru_add %p %p '%pd'\n", di, dn, dn); |
3d8eb7a9 SW |
1246 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
1247 | spin_lock(&mdsc->dentry_lru_lock); | |
1248 | list_add_tail(&di->lru, &mdsc->dentry_lru); | |
1249 | mdsc->num_dentry++; | |
1250 | spin_unlock(&mdsc->dentry_lru_lock); | |
2817b000 SW |
1251 | } |
1252 | ||
1253 | void ceph_dentry_lru_touch(struct dentry *dn) | |
1254 | { | |
1255 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1256 | struct ceph_mds_client *mdsc; | |
2817b000 | 1257 | |
a455589f AV |
1258 | dout("dentry_lru_touch %p %p '%pd' (offset %lld)\n", di, dn, dn, |
1259 | di->offset); | |
3d8eb7a9 SW |
1260 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
1261 | spin_lock(&mdsc->dentry_lru_lock); | |
1262 | list_move_tail(&di->lru, &mdsc->dentry_lru); | |
1263 | spin_unlock(&mdsc->dentry_lru_lock); | |
2817b000 SW |
1264 | } |
1265 | ||
1266 | void ceph_dentry_lru_del(struct dentry *dn) | |
1267 | { | |
1268 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1269 | struct ceph_mds_client *mdsc; | |
1270 | ||
a455589f | 1271 | dout("dentry_lru_del %p %p '%pd'\n", di, dn, dn); |
3d8eb7a9 SW |
1272 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
1273 | spin_lock(&mdsc->dentry_lru_lock); | |
1274 | list_del_init(&di->lru); | |
1275 | mdsc->num_dentry--; | |
1276 | spin_unlock(&mdsc->dentry_lru_lock); | |
2817b000 SW |
1277 | } |
1278 | ||
6c0f3af7 SW |
1279 | /* |
1280 | * Return name hash for a given dentry. This is dependent on | |
1281 | * the parent directory's hash function. | |
1282 | */ | |
e5f86dc3 | 1283 | unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn) |
6c0f3af7 | 1284 | { |
6c0f3af7 SW |
1285 | struct ceph_inode_info *dci = ceph_inode(dir); |
1286 | ||
1287 | switch (dci->i_dir_layout.dl_dir_hash) { | |
1288 | case 0: /* for backward compat */ | |
1289 | case CEPH_STR_HASH_LINUX: | |
1290 | return dn->d_name.hash; | |
1291 | ||
1292 | default: | |
1293 | return ceph_str_hash(dci->i_dir_layout.dl_dir_hash, | |
1294 | dn->d_name.name, dn->d_name.len); | |
1295 | } | |
1296 | } | |
1297 | ||
2817b000 SW |
1298 | const struct file_operations ceph_dir_fops = { |
1299 | .read = ceph_read_dir, | |
77acfa29 | 1300 | .iterate = ceph_readdir, |
2817b000 SW |
1301 | .llseek = ceph_dir_llseek, |
1302 | .open = ceph_open, | |
1303 | .release = ceph_release, | |
1304 | .unlocked_ioctl = ceph_ioctl, | |
da819c81 | 1305 | .fsync = ceph_fsync, |
2817b000 SW |
1306 | }; |
1307 | ||
38c48b5f YZ |
1308 | const struct file_operations ceph_snapdir_fops = { |
1309 | .iterate = ceph_readdir, | |
1310 | .llseek = ceph_dir_llseek, | |
1311 | .open = ceph_open, | |
1312 | .release = ceph_release, | |
1313 | }; | |
1314 | ||
2817b000 SW |
1315 | const struct inode_operations ceph_dir_iops = { |
1316 | .lookup = ceph_lookup, | |
1317 | .permission = ceph_permission, | |
1318 | .getattr = ceph_getattr, | |
1319 | .setattr = ceph_setattr, | |
1320 | .setxattr = ceph_setxattr, | |
1321 | .getxattr = ceph_getxattr, | |
1322 | .listxattr = ceph_listxattr, | |
1323 | .removexattr = ceph_removexattr, | |
7221fe4c | 1324 | .get_acl = ceph_get_acl, |
72466d0b | 1325 | .set_acl = ceph_set_acl, |
2817b000 SW |
1326 | .mknod = ceph_mknod, |
1327 | .symlink = ceph_symlink, | |
1328 | .mkdir = ceph_mkdir, | |
1329 | .link = ceph_link, | |
1330 | .unlink = ceph_unlink, | |
1331 | .rmdir = ceph_unlink, | |
1332 | .rename = ceph_rename, | |
1333 | .create = ceph_create, | |
2d83bde9 | 1334 | .atomic_open = ceph_atomic_open, |
2817b000 SW |
1335 | }; |
1336 | ||
38c48b5f YZ |
1337 | const struct inode_operations ceph_snapdir_iops = { |
1338 | .lookup = ceph_lookup, | |
1339 | .permission = ceph_permission, | |
1340 | .getattr = ceph_getattr, | |
1341 | .mkdir = ceph_mkdir, | |
1342 | .rmdir = ceph_unlink, | |
0ea611a3 | 1343 | .rename = ceph_rename, |
38c48b5f YZ |
1344 | }; |
1345 | ||
52dfb8ac | 1346 | const struct dentry_operations ceph_dentry_ops = { |
2817b000 | 1347 | .d_revalidate = ceph_d_revalidate, |
147851d2 | 1348 | .d_release = ceph_d_release, |
b58dc410 | 1349 | .d_prune = ceph_d_prune, |
2817b000 SW |
1350 | }; |
1351 | ||
52dfb8ac | 1352 | const struct dentry_operations ceph_snapdir_dentry_ops = { |
2817b000 | 1353 | .d_revalidate = ceph_snapdir_d_revalidate, |
147851d2 | 1354 | .d_release = ceph_d_release, |
2817b000 SW |
1355 | }; |
1356 | ||
52dfb8ac | 1357 | const struct dentry_operations ceph_snap_dentry_ops = { |
147851d2 | 1358 | .d_release = ceph_d_release, |
b58dc410 | 1359 | .d_prune = ceph_d_prune, |
2817b000 | 1360 | }; |