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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 | ||
2817b000 SW |
71 | /* |
72 | * for readdir, we encode the directory frag and offset within that | |
73 | * frag into f_pos. | |
74 | */ | |
75 | static unsigned fpos_frag(loff_t p) | |
76 | { | |
77 | return p >> 32; | |
78 | } | |
79 | static unsigned fpos_off(loff_t p) | |
80 | { | |
81 | return p & 0xffffffff; | |
82 | } | |
83 | ||
4d5f5df6 YZ |
84 | static int fpos_cmp(loff_t l, loff_t r) |
85 | { | |
86 | int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r)); | |
87 | if (v) | |
88 | return v; | |
89 | return (int)(fpos_off(l) - fpos_off(r)); | |
90 | } | |
91 | ||
fdd4e158 YZ |
92 | /* |
93 | * make note of the last dentry we read, so we can | |
94 | * continue at the same lexicographical point, | |
95 | * regardless of what dir changes take place on the | |
96 | * server. | |
97 | */ | |
98 | static int note_last_dentry(struct ceph_file_info *fi, const char *name, | |
99 | int len, unsigned next_offset) | |
100 | { | |
101 | char *buf = kmalloc(len+1, GFP_KERNEL); | |
102 | if (!buf) | |
103 | return -ENOMEM; | |
104 | kfree(fi->last_name); | |
105 | fi->last_name = buf; | |
106 | memcpy(fi->last_name, name, len); | |
107 | fi->last_name[len] = 0; | |
108 | fi->next_offset = next_offset; | |
109 | dout("note_last_dentry '%s'\n", fi->last_name); | |
110 | return 0; | |
111 | } | |
112 | ||
2817b000 SW |
113 | /* |
114 | * When possible, we try to satisfy a readdir by peeking at the | |
115 | * dcache. We make this work by carefully ordering dentries on | |
946e51f2 | 116 | * d_child when we initially get results back from the MDS, and |
2817b000 SW |
117 | * falling back to a "normal" sync readdir if any dentries in the dir |
118 | * are dropped. | |
119 | * | |
2f276c51 | 120 | * Complete dir indicates that we have all dentries in the dir. It is |
2817b000 SW |
121 | * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by |
122 | * the MDS if/when the directory is modified). | |
123 | */ | |
a30be7cb YZ |
124 | static int __dcache_readdir(struct file *file, struct dir_context *ctx, |
125 | u32 shared_gen) | |
2817b000 | 126 | { |
77acfa29 | 127 | struct ceph_file_info *fi = file->private_data; |
b583043e | 128 | struct dentry *parent = file->f_path.dentry; |
2b0143b5 | 129 | struct inode *dir = d_inode(parent); |
fdd4e158 | 130 | struct dentry *dentry, *last = NULL; |
2817b000 | 131 | struct ceph_dentry_info *di; |
fdd4e158 | 132 | unsigned nsize = PAGE_CACHE_SIZE / sizeof(struct dentry *); |
2817b000 | 133 | int err = 0; |
fdd4e158 YZ |
134 | loff_t ptr_pos = 0; |
135 | struct ceph_readdir_cache_control cache_ctl = {}; | |
2817b000 | 136 | |
fdd4e158 | 137 | dout("__dcache_readdir %p v%u at %llu\n", dir, shared_gen, ctx->pos); |
2817b000 | 138 | |
fdd4e158 YZ |
139 | /* we can calculate cache index for the first dirfrag */ |
140 | if (ceph_frag_is_leftmost(fpos_frag(ctx->pos))) { | |
141 | cache_ctl.index = fpos_off(ctx->pos) - 2; | |
142 | BUG_ON(cache_ctl.index < 0); | |
143 | ptr_pos = cache_ctl.index * sizeof(struct dentry *); | |
2817b000 SW |
144 | } |
145 | ||
fdd4e158 YZ |
146 | while (true) { |
147 | pgoff_t pgoff; | |
148 | bool emit_dentry; | |
149 | ||
150 | if (ptr_pos >= i_size_read(dir)) { | |
9cfa1098 | 151 | fi->flags |= CEPH_F_ATEND; |
fdd4e158 YZ |
152 | err = 0; |
153 | break; | |
2817b000 | 154 | } |
fdd4e158 YZ |
155 | |
156 | err = -EAGAIN; | |
157 | pgoff = ptr_pos >> PAGE_CACHE_SHIFT; | |
158 | if (!cache_ctl.page || pgoff != page_index(cache_ctl.page)) { | |
159 | ceph_readdir_cache_release(&cache_ctl); | |
160 | cache_ctl.page = find_lock_page(&dir->i_data, pgoff); | |
161 | if (!cache_ctl.page) { | |
162 | dout(" page %lu not found\n", pgoff); | |
163 | break; | |
164 | } | |
165 | /* reading/filling the cache are serialized by | |
166 | * i_mutex, no need to use page lock */ | |
167 | unlock_page(cache_ctl.page); | |
168 | cache_ctl.dentries = kmap(cache_ctl.page); | |
169 | } | |
170 | ||
171 | rcu_read_lock(); | |
172 | spin_lock(&parent->d_lock); | |
173 | /* check i_size again here, because empty directory can be | |
174 | * marked as complete while not holding the i_mutex. */ | |
175 | if (ceph_dir_is_complete_ordered(dir) && | |
176 | ptr_pos < i_size_read(dir)) | |
177 | dentry = cache_ctl.dentries[cache_ctl.index % nsize]; | |
178 | else | |
179 | dentry = NULL; | |
180 | spin_unlock(&parent->d_lock); | |
181 | if (dentry && !lockref_get_not_dead(&dentry->d_lockref)) | |
182 | dentry = NULL; | |
183 | rcu_read_unlock(); | |
184 | if (!dentry) | |
185 | break; | |
186 | ||
187 | emit_dentry = false; | |
188 | di = ceph_dentry(dentry); | |
189 | spin_lock(&dentry->d_lock); | |
a30be7cb | 190 | if (di->lease_shared_gen == shared_gen && |
fdd4e158 | 191 | d_really_is_positive(dentry) && |
2b0143b5 DH |
192 | ceph_snap(d_inode(dentry)) != CEPH_SNAPDIR && |
193 | ceph_ino(d_inode(dentry)) != CEPH_INO_CEPH && | |
fdd4e158 YZ |
194 | fpos_cmp(ctx->pos, di->offset) <= 0) { |
195 | emit_dentry = true; | |
196 | } | |
da502956 | 197 | spin_unlock(&dentry->d_lock); |
2817b000 | 198 | |
fdd4e158 YZ |
199 | if (emit_dentry) { |
200 | dout(" %llu (%llu) dentry %p %pd %p\n", di->offset, ctx->pos, | |
201 | dentry, dentry, d_inode(dentry)); | |
202 | ctx->pos = di->offset; | |
203 | if (!dir_emit(ctx, dentry->d_name.name, | |
204 | dentry->d_name.len, | |
205 | ceph_translate_ino(dentry->d_sb, | |
206 | d_inode(dentry)->i_ino), | |
207 | d_inode(dentry)->i_mode >> 12)) { | |
208 | dput(dentry); | |
209 | err = 0; | |
210 | break; | |
211 | } | |
212 | ctx->pos++; | |
0081bd83 | 213 | |
fdd4e158 YZ |
214 | if (last) |
215 | dput(last); | |
216 | last = dentry; | |
217 | } else { | |
218 | dput(dentry); | |
2817b000 | 219 | } |
f5b06628 | 220 | |
fdd4e158 YZ |
221 | cache_ctl.index++; |
222 | ptr_pos += sizeof(struct dentry *); | |
223 | } | |
224 | ceph_readdir_cache_release(&cache_ctl); | |
225 | if (last) { | |
226 | int ret; | |
227 | di = ceph_dentry(last); | |
228 | ret = note_last_dentry(fi, last->d_name.name, last->d_name.len, | |
229 | fpos_off(di->offset) + 1); | |
230 | if (ret < 0) | |
231 | err = ret; | |
2817b000 | 232 | dput(last); |
fdd4e158 | 233 | } |
2817b000 SW |
234 | return err; |
235 | } | |
236 | ||
77acfa29 | 237 | static int ceph_readdir(struct file *file, struct dir_context *ctx) |
2817b000 | 238 | { |
77acfa29 AV |
239 | struct ceph_file_info *fi = file->private_data; |
240 | struct inode *inode = file_inode(file); | |
2817b000 | 241 | struct ceph_inode_info *ci = ceph_inode(inode); |
3d14c5d2 YS |
242 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
243 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
77acfa29 AV |
244 | unsigned frag = fpos_frag(ctx->pos); |
245 | int off = fpos_off(ctx->pos); | |
2817b000 SW |
246 | int err; |
247 | u32 ftype; | |
248 | struct ceph_mds_reply_info_parsed *rinfo; | |
2817b000 | 249 | |
77acfa29 | 250 | dout("readdir %p file %p frag %u off %u\n", inode, file, frag, off); |
9cfa1098 | 251 | if (fi->flags & CEPH_F_ATEND) |
2817b000 SW |
252 | return 0; |
253 | ||
254 | /* always start with . and .. */ | |
77acfa29 | 255 | if (ctx->pos == 0) { |
2817b000 | 256 | dout("readdir off 0 -> '.'\n"); |
77acfa29 | 257 | if (!dir_emit(ctx, ".", 1, |
ad1fee96 | 258 | ceph_translate_ino(inode->i_sb, inode->i_ino), |
77acfa29 | 259 | inode->i_mode >> 12)) |
2817b000 | 260 | return 0; |
77acfa29 | 261 | ctx->pos = 1; |
2817b000 SW |
262 | off = 1; |
263 | } | |
77acfa29 | 264 | if (ctx->pos == 1) { |
b583043e | 265 | ino_t ino = parent_ino(file->f_path.dentry); |
2817b000 | 266 | dout("readdir off 1 -> '..'\n"); |
77acfa29 | 267 | if (!dir_emit(ctx, "..", 2, |
ad1fee96 | 268 | ceph_translate_ino(inode->i_sb, ino), |
77acfa29 | 269 | inode->i_mode >> 12)) |
2817b000 | 270 | return 0; |
77acfa29 | 271 | ctx->pos = 2; |
2817b000 SW |
272 | off = 2; |
273 | } | |
274 | ||
275 | /* can we use the dcache? */ | |
be655596 | 276 | spin_lock(&ci->i_ceph_lock); |
fdd4e158 | 277 | if (ceph_test_mount_opt(fsc, DCACHE) && |
3d14c5d2 | 278 | !ceph_test_mount_opt(fsc, NOASYNCREADDIR) && |
a0dff78d | 279 | ceph_snap(inode) != CEPH_SNAPDIR && |
70db4f36 | 280 | __ceph_dir_is_complete_ordered(ci) && |
2817b000 | 281 | __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) { |
a30be7cb | 282 | u32 shared_gen = ci->i_shared_gen; |
be655596 | 283 | spin_unlock(&ci->i_ceph_lock); |
a30be7cb | 284 | err = __dcache_readdir(file, ctx, shared_gen); |
efa4c120 | 285 | if (err != -EAGAIN) |
2817b000 | 286 | return err; |
0081bd83 YZ |
287 | frag = fpos_frag(ctx->pos); |
288 | off = fpos_off(ctx->pos); | |
efa4c120 | 289 | } else { |
be655596 | 290 | spin_unlock(&ci->i_ceph_lock); |
2817b000 | 291 | } |
2817b000 SW |
292 | |
293 | /* proceed with a normal readdir */ | |
2817b000 SW |
294 | more: |
295 | /* do we have the correct frag content buffered? */ | |
296 | if (fi->frag != frag || fi->last_readdir == NULL) { | |
297 | struct ceph_mds_request *req; | |
298 | int op = ceph_snap(inode) == CEPH_SNAPDIR ? | |
299 | CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR; | |
300 | ||
301 | /* discard old result, if any */ | |
393f6620 | 302 | if (fi->last_readdir) { |
2817b000 | 303 | ceph_mdsc_put_request(fi->last_readdir); |
393f6620 SW |
304 | fi->last_readdir = NULL; |
305 | } | |
2817b000 | 306 | |
2817b000 SW |
307 | dout("readdir fetching %llx.%llx frag %x offset '%s'\n", |
308 | ceph_vinop(inode), frag, fi->last_name); | |
309 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
310 | if (IS_ERR(req)) | |
311 | return PTR_ERR(req); | |
54008399 YZ |
312 | err = ceph_alloc_readdir_reply_buffer(req, inode); |
313 | if (err) { | |
314 | ceph_mdsc_put_request(req); | |
315 | return err; | |
316 | } | |
2817b000 SW |
317 | /* hints to request -> mds selection code */ |
318 | req->r_direct_mode = USE_AUTH_MDS; | |
319 | req->r_direct_hash = ceph_frag_value(frag); | |
320 | req->r_direct_is_hash = true; | |
a149bb9a | 321 | if (fi->last_name) { |
687265e5 | 322 | req->r_path2 = kstrdup(fi->last_name, GFP_KERNEL); |
a149bb9a SK |
323 | if (!req->r_path2) { |
324 | ceph_mdsc_put_request(req); | |
325 | return -ENOMEM; | |
326 | } | |
327 | } | |
fdd4e158 YZ |
328 | req->r_dir_release_cnt = fi->dir_release_count; |
329 | req->r_dir_ordered_cnt = fi->dir_ordered_count; | |
330 | req->r_readdir_cache_idx = fi->readdir_cache_idx; | |
2817b000 SW |
331 | req->r_readdir_offset = fi->next_offset; |
332 | req->r_args.readdir.frag = cpu_to_le32(frag); | |
a149bb9a SK |
333 | |
334 | req->r_inode = inode; | |
335 | ihold(inode); | |
336 | req->r_dentry = dget(file->f_path.dentry); | |
2817b000 SW |
337 | err = ceph_mdsc_do_request(mdsc, NULL, req); |
338 | if (err < 0) { | |
339 | ceph_mdsc_put_request(req); | |
340 | return err; | |
341 | } | |
342 | dout("readdir got and parsed readdir result=%d" | |
343 | " on frag %x, end=%d, complete=%d\n", err, frag, | |
344 | (int)req->r_reply_info.dir_end, | |
345 | (int)req->r_reply_info.dir_complete); | |
346 | ||
2817b000 SW |
347 | |
348 | /* note next offset and last dentry name */ | |
81c6aea5 YZ |
349 | rinfo = &req->r_reply_info; |
350 | if (le32_to_cpu(rinfo->dir_dir->frag) != frag) { | |
351 | frag = le32_to_cpu(rinfo->dir_dir->frag); | |
fdd4e158 YZ |
352 | off = req->r_readdir_offset; |
353 | fi->next_offset = off; | |
81c6aea5 | 354 | } |
fdd4e158 | 355 | |
f0494206 | 356 | fi->frag = frag; |
2817b000 SW |
357 | fi->offset = fi->next_offset; |
358 | fi->last_readdir = req; | |
359 | ||
fdd4e158 YZ |
360 | if (req->r_did_prepopulate) { |
361 | fi->readdir_cache_idx = req->r_readdir_cache_idx; | |
362 | if (fi->readdir_cache_idx < 0) { | |
363 | /* preclude from marking dir ordered */ | |
364 | fi->dir_ordered_count = 0; | |
365 | } else if (ceph_frag_is_leftmost(frag) && off == 2) { | |
366 | /* note dir version at start of readdir so | |
367 | * we can tell if any dentries get dropped */ | |
368 | fi->dir_release_count = req->r_dir_release_cnt; | |
369 | fi->dir_ordered_count = req->r_dir_ordered_cnt; | |
370 | } | |
371 | } else { | |
372 | dout("readdir !did_prepopulate"); | |
373 | /* disable readdir cache */ | |
374 | fi->readdir_cache_idx = -1; | |
375 | /* preclude from marking dir complete */ | |
376 | fi->dir_release_count = 0; | |
377 | } | |
378 | ||
2817b000 SW |
379 | if (req->r_reply_info.dir_end) { |
380 | kfree(fi->last_name); | |
381 | fi->last_name = NULL; | |
7b88dadc SW |
382 | if (ceph_frag_is_rightmost(frag)) |
383 | fi->next_offset = 2; | |
384 | else | |
385 | fi->next_offset = 0; | |
2817b000 | 386 | } else { |
2817b000 SW |
387 | err = note_last_dentry(fi, |
388 | rinfo->dir_dname[rinfo->dir_nr-1], | |
fdd4e158 YZ |
389 | rinfo->dir_dname_len[rinfo->dir_nr-1], |
390 | fi->next_offset + rinfo->dir_nr); | |
2817b000 SW |
391 | if (err) |
392 | return err; | |
2817b000 SW |
393 | } |
394 | } | |
395 | ||
396 | rinfo = &fi->last_readdir->r_reply_info; | |
397 | dout("readdir frag %x num %d off %d chunkoff %d\n", frag, | |
398 | rinfo->dir_nr, off, fi->offset); | |
77acfa29 AV |
399 | |
400 | ctx->pos = ceph_make_fpos(frag, off); | |
da39822c | 401 | while (off >= fi->offset && off - fi->offset < rinfo->dir_nr) { |
2817b000 SW |
402 | struct ceph_mds_reply_inode *in = |
403 | rinfo->dir_in[off - fi->offset].in; | |
3105c19c SW |
404 | struct ceph_vino vino; |
405 | ino_t ino; | |
406 | ||
2817b000 | 407 | dout("readdir off %d (%d/%d) -> %lld '%.*s' %p\n", |
77acfa29 | 408 | off, off - fi->offset, rinfo->dir_nr, ctx->pos, |
2817b000 SW |
409 | rinfo->dir_dname_len[off - fi->offset], |
410 | rinfo->dir_dname[off - fi->offset], in); | |
411 | BUG_ON(!in); | |
412 | ftype = le32_to_cpu(in->mode) >> 12; | |
3105c19c SW |
413 | vino.ino = le64_to_cpu(in->ino); |
414 | vino.snap = le64_to_cpu(in->snapid); | |
415 | ino = ceph_vino_to_ino(vino); | |
77acfa29 | 416 | if (!dir_emit(ctx, |
2817b000 SW |
417 | rinfo->dir_dname[off - fi->offset], |
418 | rinfo->dir_dname_len[off - fi->offset], | |
77acfa29 | 419 | ceph_translate_ino(inode->i_sb, ino), ftype)) { |
2817b000 SW |
420 | dout("filldir stopping us...\n"); |
421 | return 0; | |
422 | } | |
423 | off++; | |
77acfa29 | 424 | ctx->pos++; |
2817b000 SW |
425 | } |
426 | ||
427 | if (fi->last_name) { | |
428 | ceph_mdsc_put_request(fi->last_readdir); | |
429 | fi->last_readdir = NULL; | |
430 | goto more; | |
431 | } | |
432 | ||
433 | /* more frags? */ | |
434 | if (!ceph_frag_is_rightmost(frag)) { | |
435 | frag = ceph_frag_next(frag); | |
436 | off = 0; | |
77acfa29 | 437 | ctx->pos = ceph_make_fpos(frag, off); |
2817b000 SW |
438 | dout("readdir next frag is %x\n", frag); |
439 | goto more; | |
440 | } | |
9cfa1098 | 441 | fi->flags |= CEPH_F_ATEND; |
2817b000 SW |
442 | |
443 | /* | |
444 | * if dir_release_count still matches the dir, no dentries | |
445 | * were released during the whole readdir, and we should have | |
446 | * the complete dir contents in our cache. | |
447 | */ | |
fdd4e158 YZ |
448 | if (atomic64_read(&ci->i_release_count) == fi->dir_release_count) { |
449 | spin_lock(&ci->i_ceph_lock); | |
450 | if (fi->dir_ordered_count == atomic64_read(&ci->i_ordered_count)) { | |
70db4f36 | 451 | dout(" marking %p complete and ordered\n", inode); |
fdd4e158 YZ |
452 | /* use i_size to track number of entries in |
453 | * readdir cache */ | |
454 | BUG_ON(fi->readdir_cache_idx < 0); | |
455 | i_size_write(inode, fi->readdir_cache_idx * | |
456 | sizeof(struct dentry*)); | |
457 | } else { | |
70db4f36 | 458 | dout(" marking %p complete\n", inode); |
fdd4e158 | 459 | } |
70db4f36 YZ |
460 | __ceph_dir_set_complete(ci, fi->dir_release_count, |
461 | fi->dir_ordered_count); | |
fdd4e158 | 462 | spin_unlock(&ci->i_ceph_lock); |
2817b000 | 463 | } |
2817b000 | 464 | |
77acfa29 | 465 | dout("readdir %p file %p done.\n", inode, file); |
2817b000 SW |
466 | return 0; |
467 | } | |
468 | ||
dcd3cc05 | 469 | static void reset_readdir(struct ceph_file_info *fi, unsigned frag) |
2817b000 SW |
470 | { |
471 | if (fi->last_readdir) { | |
472 | ceph_mdsc_put_request(fi->last_readdir); | |
473 | fi->last_readdir = NULL; | |
474 | } | |
475 | kfree(fi->last_name); | |
a1629c3b | 476 | fi->last_name = NULL; |
fdd4e158 YZ |
477 | fi->dir_release_count = 0; |
478 | fi->readdir_cache_idx = -1; | |
dcd3cc05 YZ |
479 | if (ceph_frag_is_leftmost(frag)) |
480 | fi->next_offset = 2; /* compensate for . and .. */ | |
481 | else | |
482 | fi->next_offset = 0; | |
9cfa1098 | 483 | fi->flags &= ~CEPH_F_ATEND; |
2817b000 SW |
484 | } |
485 | ||
965c8e59 | 486 | static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence) |
2817b000 SW |
487 | { |
488 | struct ceph_file_info *fi = file->private_data; | |
489 | struct inode *inode = file->f_mapping->host; | |
f0494206 | 490 | loff_t old_offset = ceph_make_fpos(fi->frag, fi->next_offset); |
2817b000 SW |
491 | loff_t retval; |
492 | ||
5955102c | 493 | inode_lock(inode); |
06222e49 | 494 | retval = -EINVAL; |
965c8e59 | 495 | switch (whence) { |
2817b000 SW |
496 | case SEEK_CUR: |
497 | offset += file->f_pos; | |
06222e49 JB |
498 | case SEEK_SET: |
499 | break; | |
fdd4e158 YZ |
500 | case SEEK_END: |
501 | retval = -EOPNOTSUPP; | |
06222e49 JB |
502 | default: |
503 | goto out; | |
2817b000 | 504 | } |
06222e49 | 505 | |
f0494206 | 506 | if (offset >= 0) { |
2817b000 SW |
507 | if (offset != file->f_pos) { |
508 | file->f_pos = offset; | |
509 | file->f_version = 0; | |
9cfa1098 | 510 | fi->flags &= ~CEPH_F_ATEND; |
2817b000 SW |
511 | } |
512 | retval = offset; | |
513 | ||
2817b000 | 514 | if (offset == 0 || |
f0494206 | 515 | fpos_frag(offset) != fi->frag || |
2817b000 | 516 | fpos_off(offset) < fi->offset) { |
fdd4e158 YZ |
517 | /* discard buffered readdir content on seekdir(0), or |
518 | * seek to new frag, or seek prior to current chunk */ | |
2817b000 | 519 | dout("dir_llseek dropping %p content\n", file); |
dcd3cc05 | 520 | reset_readdir(fi, fpos_frag(offset)); |
fdd4e158 YZ |
521 | } else if (fpos_cmp(offset, old_offset) > 0) { |
522 | /* reset dir_release_count if we did a forward seek */ | |
523 | fi->dir_release_count = 0; | |
524 | fi->readdir_cache_idx = -1; | |
2817b000 | 525 | } |
2817b000 | 526 | } |
06222e49 | 527 | out: |
5955102c | 528 | inode_unlock(inode); |
2817b000 SW |
529 | return retval; |
530 | } | |
531 | ||
532 | /* | |
468640e3 | 533 | * Handle lookups for the hidden .snap directory. |
2817b000 | 534 | */ |
468640e3 SW |
535 | int ceph_handle_snapdir(struct ceph_mds_request *req, |
536 | struct dentry *dentry, int err) | |
2817b000 | 537 | { |
3d14c5d2 | 538 | struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); |
2b0143b5 | 539 | struct inode *parent = d_inode(dentry->d_parent); /* we hold i_mutex */ |
2817b000 SW |
540 | |
541 | /* .snap dir? */ | |
542 | if (err == -ENOENT && | |
455cec0a | 543 | ceph_snap(parent) == CEPH_NOSNAP && |
6b805185 | 544 | strcmp(dentry->d_name.name, |
3d14c5d2 | 545 | fsc->mount_options->snapdir_name) == 0) { |
2817b000 | 546 | struct inode *inode = ceph_get_snapdir(parent); |
a455589f AV |
547 | dout("ENOENT on snapdir %p '%pd', linking to snapdir %p\n", |
548 | dentry, dentry, inode); | |
9358c6d4 | 549 | BUG_ON(!d_unhashed(dentry)); |
2817b000 SW |
550 | d_add(dentry, inode); |
551 | err = 0; | |
552 | } | |
468640e3 SW |
553 | return err; |
554 | } | |
2817b000 | 555 | |
468640e3 SW |
556 | /* |
557 | * Figure out final result of a lookup/open request. | |
558 | * | |
559 | * Mainly, make sure we return the final req->r_dentry (if it already | |
560 | * existed) in place of the original VFS-provided dentry when they | |
561 | * differ. | |
562 | * | |
563 | * Gracefully handle the case where the MDS replies with -ENOENT and | |
564 | * no trace (which it may do, at its discretion, e.g., if it doesn't | |
565 | * care to issue a lease on the negative dentry). | |
566 | */ | |
567 | struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, | |
568 | struct dentry *dentry, int err) | |
569 | { | |
2817b000 SW |
570 | if (err == -ENOENT) { |
571 | /* no trace? */ | |
572 | err = 0; | |
573 | if (!req->r_reply_info.head->is_dentry) { | |
574 | dout("ENOENT and no trace, dentry %p inode %p\n", | |
2b0143b5 DH |
575 | dentry, d_inode(dentry)); |
576 | if (d_really_is_positive(dentry)) { | |
2817b000 SW |
577 | d_drop(dentry); |
578 | err = -ENOENT; | |
579 | } else { | |
580 | d_add(dentry, NULL); | |
581 | } | |
582 | } | |
583 | } | |
584 | if (err) | |
585 | dentry = ERR_PTR(err); | |
586 | else if (dentry != req->r_dentry) | |
587 | dentry = dget(req->r_dentry); /* we got spliced */ | |
588 | else | |
589 | dentry = NULL; | |
590 | return dentry; | |
591 | } | |
592 | ||
1d1de916 SW |
593 | static int is_root_ceph_dentry(struct inode *inode, struct dentry *dentry) |
594 | { | |
595 | return ceph_ino(inode) == CEPH_INO_ROOT && | |
596 | strncmp(dentry->d_name.name, ".ceph", 5) == 0; | |
597 | } | |
598 | ||
2817b000 SW |
599 | /* |
600 | * Look up a single dir entry. If there is a lookup intent, inform | |
601 | * the MDS so that it gets our 'caps wanted' value in a single op. | |
602 | */ | |
603 | static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry, | |
00cd8dd3 | 604 | unsigned int flags) |
2817b000 | 605 | { |
3d14c5d2 YS |
606 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
607 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
608 | struct ceph_mds_request *req; |
609 | int op; | |
315f2408 | 610 | int mask; |
2817b000 SW |
611 | int err; |
612 | ||
a455589f AV |
613 | dout("lookup %p dentry %p '%pd'\n", |
614 | dir, dentry, dentry); | |
2817b000 SW |
615 | |
616 | if (dentry->d_name.len > NAME_MAX) | |
617 | return ERR_PTR(-ENAMETOOLONG); | |
618 | ||
619 | err = ceph_init_dentry(dentry); | |
620 | if (err < 0) | |
621 | return ERR_PTR(err); | |
622 | ||
2817b000 | 623 | /* can we conclude ENOENT locally? */ |
2b0143b5 | 624 | if (d_really_is_negative(dentry)) { |
2817b000 SW |
625 | struct ceph_inode_info *ci = ceph_inode(dir); |
626 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
627 | ||
be655596 | 628 | spin_lock(&ci->i_ceph_lock); |
2817b000 SW |
629 | dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags); |
630 | if (strncmp(dentry->d_name.name, | |
3d14c5d2 | 631 | fsc->mount_options->snapdir_name, |
2817b000 | 632 | dentry->d_name.len) && |
1d1de916 | 633 | !is_root_ceph_dentry(dir, dentry) && |
e2c3de04 | 634 | ceph_test_mount_opt(fsc, DCACHE) && |
2f276c51 | 635 | __ceph_dir_is_complete(ci) && |
2817b000 | 636 | (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) { |
be655596 | 637 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
638 | dout(" dir %p complete, -ENOENT\n", dir); |
639 | d_add(dentry, NULL); | |
640 | di->lease_shared_gen = ci->i_shared_gen; | |
641 | return NULL; | |
642 | } | |
be655596 | 643 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
644 | } |
645 | ||
646 | op = ceph_snap(dir) == CEPH_SNAPDIR ? | |
647 | CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; | |
648 | req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); | |
649 | if (IS_ERR(req)) | |
7e34bc52 | 650 | return ERR_CAST(req); |
2817b000 SW |
651 | req->r_dentry = dget(dentry); |
652 | req->r_num_caps = 2; | |
315f2408 YZ |
653 | |
654 | mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED; | |
655 | if (ceph_security_xattr_wanted(dir)) | |
656 | mask |= CEPH_CAP_XATTR_SHARED; | |
657 | req->r_args.getattr.mask = cpu_to_le32(mask); | |
658 | ||
2817b000 SW |
659 | req->r_locked_dir = dir; |
660 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
468640e3 | 661 | err = ceph_handle_snapdir(req, dentry, err); |
2817b000 SW |
662 | dentry = ceph_finish_lookup(req, dentry, err); |
663 | ceph_mdsc_put_request(req); /* will dput(dentry) */ | |
664 | dout("lookup result=%p\n", dentry); | |
665 | return dentry; | |
666 | } | |
667 | ||
668 | /* | |
669 | * If we do a create but get no trace back from the MDS, follow up with | |
670 | * a lookup (the VFS expects us to link up the provided dentry). | |
671 | */ | |
672 | int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry) | |
673 | { | |
00cd8dd3 | 674 | struct dentry *result = ceph_lookup(dir, dentry, 0); |
2817b000 SW |
675 | |
676 | if (result && !IS_ERR(result)) { | |
677 | /* | |
678 | * We created the item, then did a lookup, and found | |
679 | * it was already linked to another inode we already | |
4d41cef2 YZ |
680 | * had in our cache (and thus got spliced). To not |
681 | * confuse VFS (especially when inode is a directory), | |
682 | * we don't link our dentry to that inode, return an | |
683 | * error instead. | |
684 | * | |
685 | * This event should be rare and it happens only when | |
686 | * we talk to old MDS. Recent MDS does not send traceless | |
687 | * reply for request that creates new inode. | |
2817b000 | 688 | */ |
5cba372c | 689 | d_drop(result); |
4d41cef2 | 690 | return -ESTALE; |
2817b000 SW |
691 | } |
692 | return PTR_ERR(result); | |
693 | } | |
694 | ||
695 | static int ceph_mknod(struct inode *dir, struct dentry *dentry, | |
1a67aafb | 696 | umode_t mode, dev_t rdev) |
2817b000 | 697 | { |
3d14c5d2 YS |
698 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
699 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 | 700 | struct ceph_mds_request *req; |
b1ee94aa | 701 | struct ceph_acls_info acls = {}; |
2817b000 SW |
702 | int err; |
703 | ||
704 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
705 | return -EROFS; | |
706 | ||
b1ee94aa YZ |
707 | err = ceph_pre_init_acls(dir, &mode, &acls); |
708 | if (err < 0) | |
709 | return err; | |
710 | ||
1a67aafb | 711 | dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n", |
2817b000 SW |
712 | dir, dentry, mode, rdev); |
713 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS); | |
714 | if (IS_ERR(req)) { | |
b1ee94aa YZ |
715 | err = PTR_ERR(req); |
716 | goto out; | |
2817b000 SW |
717 | } |
718 | req->r_dentry = dget(dentry); | |
719 | req->r_num_caps = 2; | |
720 | req->r_locked_dir = dir; | |
721 | req->r_args.mknod.mode = cpu_to_le32(mode); | |
722 | req->r_args.mknod.rdev = cpu_to_le32(rdev); | |
723 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
724 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
b1ee94aa YZ |
725 | if (acls.pagelist) { |
726 | req->r_pagelist = acls.pagelist; | |
727 | acls.pagelist = NULL; | |
728 | } | |
2817b000 SW |
729 | err = ceph_mdsc_do_request(mdsc, dir, req); |
730 | if (!err && !req->r_reply_info.head->is_dentry) | |
731 | err = ceph_handle_notrace_create(dir, dentry); | |
732 | ceph_mdsc_put_request(req); | |
b1ee94aa | 733 | out: |
7221fe4c | 734 | if (!err) |
2b0143b5 | 735 | ceph_init_inode_acls(d_inode(dentry), &acls); |
b20a95a0 | 736 | else |
2817b000 | 737 | d_drop(dentry); |
b1ee94aa | 738 | ceph_release_acls_info(&acls); |
2817b000 SW |
739 | return err; |
740 | } | |
741 | ||
4acdaf27 | 742 | static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 743 | bool excl) |
2817b000 | 744 | { |
2d83bde9 | 745 | return ceph_mknod(dir, dentry, mode, 0); |
2817b000 SW |
746 | } |
747 | ||
748 | static int ceph_symlink(struct inode *dir, struct dentry *dentry, | |
749 | const char *dest) | |
750 | { | |
3d14c5d2 YS |
751 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
752 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
753 | struct ceph_mds_request *req; |
754 | int err; | |
755 | ||
756 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
757 | return -EROFS; | |
758 | ||
759 | dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest); | |
760 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS); | |
761 | if (IS_ERR(req)) { | |
b1ee94aa YZ |
762 | err = PTR_ERR(req); |
763 | goto out; | |
2817b000 | 764 | } |
687265e5 | 765 | req->r_path2 = kstrdup(dest, GFP_KERNEL); |
a149bb9a SK |
766 | if (!req->r_path2) { |
767 | err = -ENOMEM; | |
768 | ceph_mdsc_put_request(req); | |
769 | goto out; | |
770 | } | |
2817b000 | 771 | req->r_locked_dir = dir; |
a149bb9a SK |
772 | req->r_dentry = dget(dentry); |
773 | req->r_num_caps = 2; | |
2817b000 SW |
774 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; |
775 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
776 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
777 | if (!err && !req->r_reply_info.head->is_dentry) | |
778 | err = ceph_handle_notrace_create(dir, dentry); | |
779 | ceph_mdsc_put_request(req); | |
b1ee94aa YZ |
780 | out: |
781 | if (err) | |
2817b000 SW |
782 | d_drop(dentry); |
783 | return err; | |
784 | } | |
785 | ||
18bb1db3 | 786 | static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
2817b000 | 787 | { |
3d14c5d2 YS |
788 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
789 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 | 790 | struct ceph_mds_request *req; |
b1ee94aa | 791 | struct ceph_acls_info acls = {}; |
2817b000 SW |
792 | int err = -EROFS; |
793 | int op; | |
794 | ||
795 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
796 | /* mkdir .snap/foo is a MKSNAP */ | |
797 | op = CEPH_MDS_OP_MKSNAP; | |
a455589f AV |
798 | dout("mksnap dir %p snap '%pd' dn %p\n", dir, |
799 | dentry, dentry); | |
2817b000 | 800 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { |
18bb1db3 | 801 | dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode); |
2817b000 SW |
802 | op = CEPH_MDS_OP_MKDIR; |
803 | } else { | |
804 | goto out; | |
805 | } | |
b1ee94aa YZ |
806 | |
807 | mode |= S_IFDIR; | |
808 | err = ceph_pre_init_acls(dir, &mode, &acls); | |
809 | if (err < 0) | |
810 | goto out; | |
811 | ||
2817b000 SW |
812 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); |
813 | if (IS_ERR(req)) { | |
814 | err = PTR_ERR(req); | |
815 | goto out; | |
816 | } | |
817 | ||
818 | req->r_dentry = dget(dentry); | |
819 | req->r_num_caps = 2; | |
820 | req->r_locked_dir = dir; | |
821 | req->r_args.mkdir.mode = cpu_to_le32(mode); | |
822 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
823 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
b1ee94aa YZ |
824 | if (acls.pagelist) { |
825 | req->r_pagelist = acls.pagelist; | |
826 | acls.pagelist = NULL; | |
827 | } | |
2817b000 | 828 | err = ceph_mdsc_do_request(mdsc, dir, req); |
275dd19e YZ |
829 | if (!err && |
830 | !req->r_reply_info.head->is_target && | |
831 | !req->r_reply_info.head->is_dentry) | |
2817b000 SW |
832 | err = ceph_handle_notrace_create(dir, dentry); |
833 | ceph_mdsc_put_request(req); | |
834 | out: | |
b20a95a0 | 835 | if (!err) |
2b0143b5 | 836 | ceph_init_inode_acls(d_inode(dentry), &acls); |
b20a95a0 | 837 | else |
2817b000 | 838 | d_drop(dentry); |
b1ee94aa | 839 | ceph_release_acls_info(&acls); |
2817b000 SW |
840 | return err; |
841 | } | |
842 | ||
843 | static int ceph_link(struct dentry *old_dentry, struct inode *dir, | |
844 | struct dentry *dentry) | |
845 | { | |
3d14c5d2 YS |
846 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
847 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
848 | struct ceph_mds_request *req; |
849 | int err; | |
850 | ||
851 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
852 | return -EROFS; | |
853 | ||
854 | dout("link in dir %p old_dentry %p dentry %p\n", dir, | |
855 | old_dentry, dentry); | |
856 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS); | |
857 | if (IS_ERR(req)) { | |
858 | d_drop(dentry); | |
859 | return PTR_ERR(req); | |
860 | } | |
861 | req->r_dentry = dget(dentry); | |
862 | req->r_num_caps = 2; | |
4b58c9b1 | 863 | req->r_old_dentry = dget(old_dentry); |
2817b000 SW |
864 | req->r_locked_dir = dir; |
865 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
866 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
ad88f23f YZ |
867 | /* release LINK_SHARED on source inode (mds will lock it) */ |
868 | req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; | |
2817b000 | 869 | err = ceph_mdsc_do_request(mdsc, dir, req); |
70b666c3 | 870 | if (err) { |
2817b000 | 871 | d_drop(dentry); |
70b666c3 | 872 | } else if (!req->r_reply_info.head->is_dentry) { |
2b0143b5 DH |
873 | ihold(d_inode(old_dentry)); |
874 | d_instantiate(dentry, d_inode(old_dentry)); | |
70b666c3 | 875 | } |
2817b000 SW |
876 | ceph_mdsc_put_request(req); |
877 | return err; | |
878 | } | |
879 | ||
880 | /* | |
881 | * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it | |
882 | * looks like the link count will hit 0, drop any other caps (other | |
883 | * than PIN) we don't specifically want (due to the file still being | |
884 | * open). | |
885 | */ | |
886 | static int drop_caps_for_unlink(struct inode *inode) | |
887 | { | |
888 | struct ceph_inode_info *ci = ceph_inode(inode); | |
889 | int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; | |
890 | ||
be655596 | 891 | spin_lock(&ci->i_ceph_lock); |
2817b000 SW |
892 | if (inode->i_nlink == 1) { |
893 | drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN); | |
894 | ci->i_ceph_flags |= CEPH_I_NODELAY; | |
895 | } | |
be655596 | 896 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
897 | return drop; |
898 | } | |
899 | ||
900 | /* | |
901 | * rmdir and unlink are differ only by the metadata op code | |
902 | */ | |
903 | static int ceph_unlink(struct inode *dir, struct dentry *dentry) | |
904 | { | |
3d14c5d2 YS |
905 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
906 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2b0143b5 | 907 | struct inode *inode = d_inode(dentry); |
2817b000 SW |
908 | struct ceph_mds_request *req; |
909 | int err = -EROFS; | |
910 | int op; | |
911 | ||
912 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
913 | /* rmdir .snap/foo is RMSNAP */ | |
a455589f | 914 | dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry); |
2817b000 SW |
915 | op = CEPH_MDS_OP_RMSNAP; |
916 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { | |
917 | dout("unlink/rmdir dir %p dn %p inode %p\n", | |
918 | dir, dentry, inode); | |
e36cb0b8 | 919 | op = d_is_dir(dentry) ? |
2817b000 SW |
920 | CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK; |
921 | } else | |
922 | goto out; | |
923 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
924 | if (IS_ERR(req)) { | |
925 | err = PTR_ERR(req); | |
926 | goto out; | |
927 | } | |
928 | req->r_dentry = dget(dentry); | |
929 | req->r_num_caps = 2; | |
930 | req->r_locked_dir = dir; | |
931 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
932 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
933 | req->r_inode_drop = drop_caps_for_unlink(inode); | |
934 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
935 | if (!err && !req->r_reply_info.head->is_dentry) | |
936 | d_delete(dentry); | |
937 | ceph_mdsc_put_request(req); | |
938 | out: | |
939 | return err; | |
940 | } | |
941 | ||
942 | static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry, | |
943 | struct inode *new_dir, struct dentry *new_dentry) | |
944 | { | |
3d14c5d2 YS |
945 | struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb); |
946 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 | 947 | struct ceph_mds_request *req; |
0ea611a3 | 948 | int op = CEPH_MDS_OP_RENAME; |
2817b000 SW |
949 | int err; |
950 | ||
951 | if (ceph_snap(old_dir) != ceph_snap(new_dir)) | |
952 | return -EXDEV; | |
0ea611a3 YZ |
953 | if (ceph_snap(old_dir) != CEPH_NOSNAP) { |
954 | if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR) | |
955 | op = CEPH_MDS_OP_RENAMESNAP; | |
956 | else | |
957 | return -EROFS; | |
958 | } | |
2817b000 SW |
959 | dout("rename dir %p dentry %p to dir %p dentry %p\n", |
960 | old_dir, old_dentry, new_dir, new_dentry); | |
0ea611a3 | 961 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); |
2817b000 SW |
962 | if (IS_ERR(req)) |
963 | return PTR_ERR(req); | |
180061a5 | 964 | ihold(old_dir); |
2817b000 SW |
965 | req->r_dentry = dget(new_dentry); |
966 | req->r_num_caps = 2; | |
967 | req->r_old_dentry = dget(old_dentry); | |
180061a5 | 968 | req->r_old_dentry_dir = old_dir; |
2817b000 SW |
969 | req->r_locked_dir = new_dir; |
970 | req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED; | |
971 | req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL; | |
972 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
973 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
974 | /* release LINK_RDCACHE on source inode (mds will lock it) */ | |
975 | req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; | |
2b0143b5 DH |
976 | if (d_really_is_positive(new_dentry)) |
977 | req->r_inode_drop = drop_caps_for_unlink(d_inode(new_dentry)); | |
2817b000 SW |
978 | err = ceph_mdsc_do_request(mdsc, old_dir, req); |
979 | if (!err && !req->r_reply_info.head->is_dentry) { | |
980 | /* | |
981 | * Normally d_move() is done by fill_trace (called by | |
982 | * do_request, above). If there is no trace, we need | |
983 | * to do it here. | |
984 | */ | |
ea1409f9 | 985 | |
fdd4e158 YZ |
986 | /* d_move screws up sibling dentries' offsets */ |
987 | ceph_dir_clear_complete(old_dir); | |
988 | ceph_dir_clear_complete(new_dir); | |
989 | ||
2817b000 | 990 | d_move(old_dentry, new_dentry); |
ea1409f9 SW |
991 | |
992 | /* ensure target dentry is invalidated, despite | |
993 | rehashing bug in vfs_rename_dir */ | |
81a6cf2d | 994 | ceph_invalidate_dentry_lease(new_dentry); |
2817b000 SW |
995 | } |
996 | ceph_mdsc_put_request(req); | |
997 | return err; | |
998 | } | |
999 | ||
81a6cf2d SW |
1000 | /* |
1001 | * Ensure a dentry lease will no longer revalidate. | |
1002 | */ | |
1003 | void ceph_invalidate_dentry_lease(struct dentry *dentry) | |
1004 | { | |
1005 | spin_lock(&dentry->d_lock); | |
1006 | dentry->d_time = jiffies; | |
1007 | ceph_dentry(dentry)->lease_shared_gen = 0; | |
1008 | spin_unlock(&dentry->d_lock); | |
1009 | } | |
2817b000 SW |
1010 | |
1011 | /* | |
1012 | * Check if dentry lease is valid. If not, delete the lease. Try to | |
1013 | * renew if the least is more than half up. | |
1014 | */ | |
1015 | static int dentry_lease_is_valid(struct dentry *dentry) | |
1016 | { | |
1017 | struct ceph_dentry_info *di; | |
1018 | struct ceph_mds_session *s; | |
1019 | int valid = 0; | |
1020 | u32 gen; | |
1021 | unsigned long ttl; | |
1022 | struct ceph_mds_session *session = NULL; | |
1023 | struct inode *dir = NULL; | |
1024 | u32 seq = 0; | |
1025 | ||
1026 | spin_lock(&dentry->d_lock); | |
1027 | di = ceph_dentry(dentry); | |
3d8eb7a9 | 1028 | if (di->lease_session) { |
2817b000 | 1029 | s = di->lease_session; |
d8fb02ab | 1030 | spin_lock(&s->s_gen_ttl_lock); |
2817b000 SW |
1031 | gen = s->s_cap_gen; |
1032 | ttl = s->s_cap_ttl; | |
d8fb02ab | 1033 | spin_unlock(&s->s_gen_ttl_lock); |
2817b000 SW |
1034 | |
1035 | if (di->lease_gen == gen && | |
1036 | time_before(jiffies, dentry->d_time) && | |
1037 | time_before(jiffies, ttl)) { | |
1038 | valid = 1; | |
1039 | if (di->lease_renew_after && | |
1040 | time_after(jiffies, di->lease_renew_after)) { | |
1041 | /* we should renew */ | |
2b0143b5 | 1042 | dir = d_inode(dentry->d_parent); |
2817b000 SW |
1043 | session = ceph_get_mds_session(s); |
1044 | seq = di->lease_seq; | |
1045 | di->lease_renew_after = 0; | |
1046 | di->lease_renew_from = jiffies; | |
1047 | } | |
2817b000 SW |
1048 | } |
1049 | } | |
1050 | spin_unlock(&dentry->d_lock); | |
1051 | ||
1052 | if (session) { | |
1053 | ceph_mdsc_lease_send_msg(session, dir, dentry, | |
1054 | CEPH_MDS_LEASE_RENEW, seq); | |
1055 | ceph_put_mds_session(session); | |
1056 | } | |
1057 | dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid); | |
1058 | return valid; | |
1059 | } | |
1060 | ||
1061 | /* | |
1062 | * Check if directory-wide content lease/cap is valid. | |
1063 | */ | |
1064 | static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry) | |
1065 | { | |
1066 | struct ceph_inode_info *ci = ceph_inode(dir); | |
1067 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
1068 | int valid = 0; | |
1069 | ||
be655596 | 1070 | spin_lock(&ci->i_ceph_lock); |
2817b000 SW |
1071 | if (ci->i_shared_gen == di->lease_shared_gen) |
1072 | valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1); | |
be655596 | 1073 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
1074 | dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n", |
1075 | dir, (unsigned)ci->i_shared_gen, dentry, | |
1076 | (unsigned)di->lease_shared_gen, valid); | |
1077 | return valid; | |
1078 | } | |
1079 | ||
1080 | /* | |
1081 | * Check if cached dentry can be trusted. | |
1082 | */ | |
0b728e19 | 1083 | static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags) |
2817b000 | 1084 | { |
bf1c6aca | 1085 | int valid = 0; |
641235d8 | 1086 | struct dentry *parent; |
34286d66 NP |
1087 | struct inode *dir; |
1088 | ||
0b728e19 | 1089 | if (flags & LOOKUP_RCU) |
34286d66 NP |
1090 | return -ECHILD; |
1091 | ||
a455589f | 1092 | dout("d_revalidate %p '%pd' inode %p offset %lld\n", dentry, |
2b0143b5 | 1093 | dentry, d_inode(dentry), ceph_dentry(dentry)->offset); |
2817b000 | 1094 | |
641235d8 YZ |
1095 | parent = dget_parent(dentry); |
1096 | dir = d_inode(parent); | |
bf1c6aca | 1097 | |
2817b000 SW |
1098 | /* always trust cached snapped dentries, snapdir dentry */ |
1099 | if (ceph_snap(dir) != CEPH_NOSNAP) { | |
a455589f | 1100 | dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry, |
2b0143b5 | 1101 | dentry, d_inode(dentry)); |
bf1c6aca | 1102 | valid = 1; |
2b0143b5 DH |
1103 | } else if (d_really_is_positive(dentry) && |
1104 | ceph_snap(d_inode(dentry)) == CEPH_SNAPDIR) { | |
bf1c6aca SW |
1105 | valid = 1; |
1106 | } else if (dentry_lease_is_valid(dentry) || | |
1107 | dir_lease_is_valid(dir, dentry)) { | |
2b0143b5 DH |
1108 | if (d_really_is_positive(dentry)) |
1109 | valid = ceph_is_any_caps(d_inode(dentry)); | |
9215aeea YZ |
1110 | else |
1111 | valid = 1; | |
2817b000 | 1112 | } |
2817b000 | 1113 | |
200fd27c YZ |
1114 | if (!valid) { |
1115 | struct ceph_mds_client *mdsc = | |
1116 | ceph_sb_to_client(dir->i_sb)->mdsc; | |
1117 | struct ceph_mds_request *req; | |
1118 | int op, mask, err; | |
1119 | ||
1120 | op = ceph_snap(dir) == CEPH_SNAPDIR ? | |
1121 | CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; | |
1122 | req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); | |
1123 | if (!IS_ERR(req)) { | |
1124 | req->r_dentry = dget(dentry); | |
1125 | req->r_num_caps = 2; | |
1126 | ||
1127 | mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED; | |
1128 | if (ceph_security_xattr_wanted(dir)) | |
1129 | mask |= CEPH_CAP_XATTR_SHARED; | |
1130 | req->r_args.getattr.mask = mask; | |
1131 | ||
1132 | req->r_locked_dir = dir; | |
1133 | err = ceph_mdsc_do_request(mdsc, NULL, req); | |
1134 | if (err == 0 || err == -ENOENT) { | |
1135 | if (dentry == req->r_dentry) { | |
1136 | valid = !d_unhashed(dentry); | |
1137 | } else { | |
1138 | d_invalidate(req->r_dentry); | |
1139 | err = -EAGAIN; | |
1140 | } | |
1141 | } | |
1142 | ceph_mdsc_put_request(req); | |
1143 | dout("d_revalidate %p lookup result=%d\n", | |
1144 | dentry, err); | |
1145 | } | |
1146 | } | |
1147 | ||
bf1c6aca | 1148 | dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid"); |
9215aeea | 1149 | if (valid) { |
bf1c6aca | 1150 | ceph_dentry_lru_touch(dentry); |
9215aeea YZ |
1151 | } else { |
1152 | ceph_dir_clear_complete(dir); | |
9215aeea | 1153 | } |
641235d8 YZ |
1154 | |
1155 | dput(parent); | |
bf1c6aca | 1156 | return valid; |
2817b000 SW |
1157 | } |
1158 | ||
1159 | /* | |
147851d2 | 1160 | * Release our ceph_dentry_info. |
2817b000 | 1161 | */ |
147851d2 | 1162 | static void ceph_d_release(struct dentry *dentry) |
2817b000 SW |
1163 | { |
1164 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
2817b000 | 1165 | |
147851d2 | 1166 | dout("d_release %p\n", dentry); |
3d8eb7a9 SW |
1167 | ceph_dentry_lru_del(dentry); |
1168 | if (di->lease_session) | |
1169 | ceph_put_mds_session(di->lease_session); | |
1170 | kmem_cache_free(ceph_dentry_cachep, di); | |
1171 | dentry->d_fsdata = NULL; | |
2817b000 SW |
1172 | } |
1173 | ||
1174 | static int ceph_snapdir_d_revalidate(struct dentry *dentry, | |
0b728e19 | 1175 | unsigned int flags) |
2817b000 SW |
1176 | { |
1177 | /* | |
1178 | * Eventually, we'll want to revalidate snapped metadata | |
1179 | * too... probably... | |
1180 | */ | |
1181 | return 1; | |
1182 | } | |
1183 | ||
b58dc410 SW |
1184 | /* |
1185 | * When the VFS prunes a dentry from the cache, we need to clear the | |
1186 | * complete flag on the parent directory. | |
1187 | * | |
1188 | * Called under dentry->d_lock. | |
1189 | */ | |
1190 | static void ceph_d_prune(struct dentry *dentry) | |
1191 | { | |
774ac21d | 1192 | dout("ceph_d_prune %p\n", dentry); |
b58dc410 SW |
1193 | |
1194 | /* do we have a valid parent? */ | |
8842b3be | 1195 | if (IS_ROOT(dentry)) |
b58dc410 SW |
1196 | return; |
1197 | ||
2f276c51 | 1198 | /* if we are not hashed, we don't affect dir's completeness */ |
b58dc410 SW |
1199 | if (d_unhashed(dentry)) |
1200 | return; | |
2817b000 | 1201 | |
b58dc410 SW |
1202 | /* |
1203 | * we hold d_lock, so d_parent is stable, and d_fsdata is never | |
1204 | * cleared until d_release | |
1205 | */ | |
2b0143b5 | 1206 | ceph_dir_clear_complete(d_inode(dentry->d_parent)); |
b58dc410 | 1207 | } |
2817b000 SW |
1208 | |
1209 | /* | |
1210 | * read() on a dir. This weird interface hack only works if mounted | |
1211 | * with '-o dirstat'. | |
1212 | */ | |
1213 | static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, | |
1214 | loff_t *ppos) | |
1215 | { | |
1216 | struct ceph_file_info *cf = file->private_data; | |
496ad9aa | 1217 | struct inode *inode = file_inode(file); |
2817b000 SW |
1218 | struct ceph_inode_info *ci = ceph_inode(inode); |
1219 | int left; | |
ae598083 | 1220 | const int bufsize = 1024; |
2817b000 | 1221 | |
3d14c5d2 | 1222 | if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT)) |
2817b000 SW |
1223 | return -EISDIR; |
1224 | ||
1225 | if (!cf->dir_info) { | |
687265e5 | 1226 | cf->dir_info = kmalloc(bufsize, GFP_KERNEL); |
2817b000 SW |
1227 | if (!cf->dir_info) |
1228 | return -ENOMEM; | |
1229 | cf->dir_info_len = | |
ae598083 | 1230 | snprintf(cf->dir_info, bufsize, |
2817b000 SW |
1231 | "entries: %20lld\n" |
1232 | " files: %20lld\n" | |
1233 | " subdirs: %20lld\n" | |
1234 | "rentries: %20lld\n" | |
1235 | " rfiles: %20lld\n" | |
1236 | " rsubdirs: %20lld\n" | |
1237 | "rbytes: %20lld\n" | |
1238 | "rctime: %10ld.%09ld\n", | |
1239 | ci->i_files + ci->i_subdirs, | |
1240 | ci->i_files, | |
1241 | ci->i_subdirs, | |
1242 | ci->i_rfiles + ci->i_rsubdirs, | |
1243 | ci->i_rfiles, | |
1244 | ci->i_rsubdirs, | |
1245 | ci->i_rbytes, | |
1246 | (long)ci->i_rctime.tv_sec, | |
1247 | (long)ci->i_rctime.tv_nsec); | |
1248 | } | |
1249 | ||
1250 | if (*ppos >= cf->dir_info_len) | |
1251 | return 0; | |
1252 | size = min_t(unsigned, size, cf->dir_info_len-*ppos); | |
1253 | left = copy_to_user(buf, cf->dir_info + *ppos, size); | |
1254 | if (left == size) | |
1255 | return -EFAULT; | |
1256 | *ppos += (size - left); | |
1257 | return size - left; | |
1258 | } | |
1259 | ||
2817b000 SW |
1260 | /* |
1261 | * We maintain a private dentry LRU. | |
1262 | * | |
1263 | * FIXME: this needs to be changed to a per-mds lru to be useful. | |
1264 | */ | |
1265 | void ceph_dentry_lru_add(struct dentry *dn) | |
1266 | { | |
1267 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1268 | struct ceph_mds_client *mdsc; | |
2817b000 | 1269 | |
a455589f | 1270 | dout("dentry_lru_add %p %p '%pd'\n", di, dn, dn); |
3d8eb7a9 SW |
1271 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
1272 | spin_lock(&mdsc->dentry_lru_lock); | |
1273 | list_add_tail(&di->lru, &mdsc->dentry_lru); | |
1274 | mdsc->num_dentry++; | |
1275 | spin_unlock(&mdsc->dentry_lru_lock); | |
2817b000 SW |
1276 | } |
1277 | ||
1278 | void ceph_dentry_lru_touch(struct dentry *dn) | |
1279 | { | |
1280 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1281 | struct ceph_mds_client *mdsc; | |
2817b000 | 1282 | |
a455589f AV |
1283 | dout("dentry_lru_touch %p %p '%pd' (offset %lld)\n", di, dn, dn, |
1284 | di->offset); | |
3d8eb7a9 SW |
1285 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
1286 | spin_lock(&mdsc->dentry_lru_lock); | |
1287 | list_move_tail(&di->lru, &mdsc->dentry_lru); | |
1288 | spin_unlock(&mdsc->dentry_lru_lock); | |
2817b000 SW |
1289 | } |
1290 | ||
1291 | void ceph_dentry_lru_del(struct dentry *dn) | |
1292 | { | |
1293 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1294 | struct ceph_mds_client *mdsc; | |
1295 | ||
a455589f | 1296 | dout("dentry_lru_del %p %p '%pd'\n", di, dn, dn); |
3d8eb7a9 SW |
1297 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
1298 | spin_lock(&mdsc->dentry_lru_lock); | |
1299 | list_del_init(&di->lru); | |
1300 | mdsc->num_dentry--; | |
1301 | spin_unlock(&mdsc->dentry_lru_lock); | |
2817b000 SW |
1302 | } |
1303 | ||
6c0f3af7 SW |
1304 | /* |
1305 | * Return name hash for a given dentry. This is dependent on | |
1306 | * the parent directory's hash function. | |
1307 | */ | |
e5f86dc3 | 1308 | unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn) |
6c0f3af7 | 1309 | { |
6c0f3af7 SW |
1310 | struct ceph_inode_info *dci = ceph_inode(dir); |
1311 | ||
1312 | switch (dci->i_dir_layout.dl_dir_hash) { | |
1313 | case 0: /* for backward compat */ | |
1314 | case CEPH_STR_HASH_LINUX: | |
1315 | return dn->d_name.hash; | |
1316 | ||
1317 | default: | |
1318 | return ceph_str_hash(dci->i_dir_layout.dl_dir_hash, | |
1319 | dn->d_name.name, dn->d_name.len); | |
1320 | } | |
1321 | } | |
1322 | ||
2817b000 SW |
1323 | const struct file_operations ceph_dir_fops = { |
1324 | .read = ceph_read_dir, | |
77acfa29 | 1325 | .iterate = ceph_readdir, |
2817b000 SW |
1326 | .llseek = ceph_dir_llseek, |
1327 | .open = ceph_open, | |
1328 | .release = ceph_release, | |
1329 | .unlocked_ioctl = ceph_ioctl, | |
da819c81 | 1330 | .fsync = ceph_fsync, |
2817b000 SW |
1331 | }; |
1332 | ||
38c48b5f YZ |
1333 | const struct file_operations ceph_snapdir_fops = { |
1334 | .iterate = ceph_readdir, | |
1335 | .llseek = ceph_dir_llseek, | |
1336 | .open = ceph_open, | |
1337 | .release = ceph_release, | |
1338 | }; | |
1339 | ||
2817b000 SW |
1340 | const struct inode_operations ceph_dir_iops = { |
1341 | .lookup = ceph_lookup, | |
1342 | .permission = ceph_permission, | |
1343 | .getattr = ceph_getattr, | |
1344 | .setattr = ceph_setattr, | |
1345 | .setxattr = ceph_setxattr, | |
1346 | .getxattr = ceph_getxattr, | |
1347 | .listxattr = ceph_listxattr, | |
1348 | .removexattr = ceph_removexattr, | |
7221fe4c | 1349 | .get_acl = ceph_get_acl, |
72466d0b | 1350 | .set_acl = ceph_set_acl, |
2817b000 SW |
1351 | .mknod = ceph_mknod, |
1352 | .symlink = ceph_symlink, | |
1353 | .mkdir = ceph_mkdir, | |
1354 | .link = ceph_link, | |
1355 | .unlink = ceph_unlink, | |
1356 | .rmdir = ceph_unlink, | |
1357 | .rename = ceph_rename, | |
1358 | .create = ceph_create, | |
2d83bde9 | 1359 | .atomic_open = ceph_atomic_open, |
2817b000 SW |
1360 | }; |
1361 | ||
38c48b5f YZ |
1362 | const struct inode_operations ceph_snapdir_iops = { |
1363 | .lookup = ceph_lookup, | |
1364 | .permission = ceph_permission, | |
1365 | .getattr = ceph_getattr, | |
1366 | .mkdir = ceph_mkdir, | |
1367 | .rmdir = ceph_unlink, | |
0ea611a3 | 1368 | .rename = ceph_rename, |
38c48b5f YZ |
1369 | }; |
1370 | ||
52dfb8ac | 1371 | const struct dentry_operations ceph_dentry_ops = { |
2817b000 | 1372 | .d_revalidate = ceph_d_revalidate, |
147851d2 | 1373 | .d_release = ceph_d_release, |
b58dc410 | 1374 | .d_prune = ceph_d_prune, |
2817b000 SW |
1375 | }; |
1376 | ||
52dfb8ac | 1377 | const struct dentry_operations ceph_snapdir_dentry_ops = { |
2817b000 | 1378 | .d_revalidate = ceph_snapdir_d_revalidate, |
147851d2 | 1379 | .d_release = ceph_d_release, |
2817b000 SW |
1380 | }; |
1381 | ||
52dfb8ac | 1382 | const struct dentry_operations ceph_snap_dentry_ops = { |
147851d2 | 1383 | .d_release = ceph_d_release, |
b58dc410 | 1384 | .d_prune = ceph_d_prune, |
2817b000 | 1385 | }; |