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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
3d14c5d2 | 2 | #include <linux/ceph/ceph_debug.h> |
2817b000 SW |
3 | |
4 | #include <linux/spinlock.h> | |
5 | #include <linux/fs_struct.h> | |
6 | #include <linux/namei.h> | |
5a0e3ad6 | 7 | #include <linux/slab.h> |
2817b000 | 8 | #include <linux/sched.h> |
2cdeb1e4 | 9 | #include <linux/xattr.h> |
2817b000 SW |
10 | |
11 | #include "super.h" | |
3d14c5d2 | 12 | #include "mds_client.h" |
2817b000 SW |
13 | |
14 | /* | |
15 | * Directory operations: readdir, lookup, create, link, unlink, | |
16 | * rename, etc. | |
17 | */ | |
18 | ||
19 | /* | |
20 | * Ceph MDS operations are specified in terms of a base ino and | |
21 | * relative path. Thus, the client can specify an operation on a | |
22 | * specific inode (e.g., a getattr due to fstat(2)), or as a path | |
23 | * relative to, say, the root directory. | |
24 | * | |
25 | * Normally, we limit ourselves to strict inode ops (no path component) | |
26 | * or dentry operations (a single path component relative to an ino). The | |
27 | * exception to this is open_root_dentry(), which will open the mount | |
28 | * point by name. | |
29 | */ | |
30 | ||
52dfb8ac | 31 | const struct dentry_operations ceph_dentry_ops; |
2817b000 SW |
32 | |
33 | /* | |
34 | * Initialize ceph dentry state. | |
35 | */ | |
ad5cb123 | 36 | static int ceph_d_init(struct dentry *dentry) |
2817b000 SW |
37 | { |
38 | struct ceph_dentry_info *di; | |
39 | ||
99ec2697 | 40 | di = kmem_cache_zalloc(ceph_dentry_cachep, GFP_KERNEL); |
2817b000 SW |
41 | if (!di) |
42 | return -ENOMEM; /* oh well */ | |
43 | ||
2817b000 SW |
44 | di->dentry = dentry; |
45 | di->lease_session = NULL; | |
9b16f03c | 46 | di->time = jiffies; |
48d0cbd1 | 47 | dentry->d_fsdata = di; |
2817b000 | 48 | ceph_dentry_lru_add(dentry); |
2817b000 SW |
49 | return 0; |
50 | } | |
51 | ||
2817b000 | 52 | /* |
f3c4ebe6 YZ |
53 | * for f_pos for readdir: |
54 | * - hash order: | |
55 | * (0xff << 52) | ((24 bits hash) << 28) | | |
56 | * (the nth entry has hash collision); | |
57 | * - frag+name order; | |
58 | * ((frag value) << 28) | (the nth entry in frag); | |
2817b000 | 59 | */ |
f3c4ebe6 YZ |
60 | #define OFFSET_BITS 28 |
61 | #define OFFSET_MASK ((1 << OFFSET_BITS) - 1) | |
62 | #define HASH_ORDER (0xffull << (OFFSET_BITS + 24)) | |
63 | loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order) | |
64 | { | |
65 | loff_t fpos = ((loff_t)high << 28) | (loff_t)off; | |
66 | if (hash_order) | |
67 | fpos |= HASH_ORDER; | |
68 | return fpos; | |
69 | } | |
70 | ||
71 | static bool is_hash_order(loff_t p) | |
72 | { | |
73 | return (p & HASH_ORDER) == HASH_ORDER; | |
74 | } | |
75 | ||
2817b000 SW |
76 | static unsigned fpos_frag(loff_t p) |
77 | { | |
f3c4ebe6 | 78 | return p >> OFFSET_BITS; |
2817b000 | 79 | } |
f3c4ebe6 YZ |
80 | |
81 | static unsigned fpos_hash(loff_t p) | |
82 | { | |
83 | return ceph_frag_value(fpos_frag(p)); | |
84 | } | |
85 | ||
2817b000 SW |
86 | static unsigned fpos_off(loff_t p) |
87 | { | |
f3c4ebe6 | 88 | return p & OFFSET_MASK; |
2817b000 SW |
89 | } |
90 | ||
4d5f5df6 YZ |
91 | static int fpos_cmp(loff_t l, loff_t r) |
92 | { | |
93 | int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r)); | |
94 | if (v) | |
95 | return v; | |
96 | return (int)(fpos_off(l) - fpos_off(r)); | |
97 | } | |
98 | ||
fdd4e158 YZ |
99 | /* |
100 | * make note of the last dentry we read, so we can | |
101 | * continue at the same lexicographical point, | |
102 | * regardless of what dir changes take place on the | |
103 | * server. | |
104 | */ | |
105 | static int note_last_dentry(struct ceph_file_info *fi, const char *name, | |
106 | int len, unsigned next_offset) | |
107 | { | |
108 | char *buf = kmalloc(len+1, GFP_KERNEL); | |
109 | if (!buf) | |
110 | return -ENOMEM; | |
111 | kfree(fi->last_name); | |
112 | fi->last_name = buf; | |
113 | memcpy(fi->last_name, name, len); | |
114 | fi->last_name[len] = 0; | |
115 | fi->next_offset = next_offset; | |
116 | dout("note_last_dentry '%s'\n", fi->last_name); | |
117 | return 0; | |
118 | } | |
119 | ||
c530cd24 YZ |
120 | |
121 | static struct dentry * | |
122 | __dcache_find_get_entry(struct dentry *parent, u64 idx, | |
123 | struct ceph_readdir_cache_control *cache_ctl) | |
124 | { | |
125 | struct inode *dir = d_inode(parent); | |
126 | struct dentry *dentry; | |
127 | unsigned idx_mask = (PAGE_SIZE / sizeof(struct dentry *)) - 1; | |
128 | loff_t ptr_pos = idx * sizeof(struct dentry *); | |
129 | pgoff_t ptr_pgoff = ptr_pos >> PAGE_SHIFT; | |
130 | ||
131 | if (ptr_pos >= i_size_read(dir)) | |
132 | return NULL; | |
133 | ||
134 | if (!cache_ctl->page || ptr_pgoff != page_index(cache_ctl->page)) { | |
135 | ceph_readdir_cache_release(cache_ctl); | |
136 | cache_ctl->page = find_lock_page(&dir->i_data, ptr_pgoff); | |
137 | if (!cache_ctl->page) { | |
138 | dout(" page %lu not found\n", ptr_pgoff); | |
139 | return ERR_PTR(-EAGAIN); | |
140 | } | |
141 | /* reading/filling the cache are serialized by | |
142 | i_mutex, no need to use page lock */ | |
143 | unlock_page(cache_ctl->page); | |
144 | cache_ctl->dentries = kmap(cache_ctl->page); | |
145 | } | |
146 | ||
147 | cache_ctl->index = idx & idx_mask; | |
148 | ||
149 | rcu_read_lock(); | |
150 | spin_lock(&parent->d_lock); | |
151 | /* check i_size again here, because empty directory can be | |
152 | * marked as complete while not holding the i_mutex. */ | |
153 | if (ceph_dir_is_complete_ordered(dir) && ptr_pos < i_size_read(dir)) | |
154 | dentry = cache_ctl->dentries[cache_ctl->index]; | |
155 | else | |
156 | dentry = NULL; | |
157 | spin_unlock(&parent->d_lock); | |
158 | if (dentry && !lockref_get_not_dead(&dentry->d_lockref)) | |
159 | dentry = NULL; | |
160 | rcu_read_unlock(); | |
161 | return dentry ? : ERR_PTR(-EAGAIN); | |
162 | } | |
163 | ||
2817b000 SW |
164 | /* |
165 | * When possible, we try to satisfy a readdir by peeking at the | |
166 | * dcache. We make this work by carefully ordering dentries on | |
946e51f2 | 167 | * d_child when we initially get results back from the MDS, and |
2817b000 SW |
168 | * falling back to a "normal" sync readdir if any dentries in the dir |
169 | * are dropped. | |
170 | * | |
2f276c51 | 171 | * Complete dir indicates that we have all dentries in the dir. It is |
2817b000 SW |
172 | * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by |
173 | * the MDS if/when the directory is modified). | |
174 | */ | |
a30be7cb YZ |
175 | static int __dcache_readdir(struct file *file, struct dir_context *ctx, |
176 | u32 shared_gen) | |
2817b000 | 177 | { |
77acfa29 | 178 | struct ceph_file_info *fi = file->private_data; |
b583043e | 179 | struct dentry *parent = file->f_path.dentry; |
2b0143b5 | 180 | struct inode *dir = d_inode(parent); |
fdd4e158 | 181 | struct dentry *dentry, *last = NULL; |
2817b000 | 182 | struct ceph_dentry_info *di; |
fdd4e158 | 183 | struct ceph_readdir_cache_control cache_ctl = {}; |
c530cd24 YZ |
184 | u64 idx = 0; |
185 | int err = 0; | |
2817b000 | 186 | |
f3c4ebe6 | 187 | dout("__dcache_readdir %p v%u at %llx\n", dir, shared_gen, ctx->pos); |
2817b000 | 188 | |
c530cd24 YZ |
189 | /* search start position */ |
190 | if (ctx->pos > 2) { | |
191 | u64 count = div_u64(i_size_read(dir), sizeof(struct dentry *)); | |
192 | while (count > 0) { | |
193 | u64 step = count >> 1; | |
194 | dentry = __dcache_find_get_entry(parent, idx + step, | |
195 | &cache_ctl); | |
196 | if (!dentry) { | |
197 | /* use linar search */ | |
198 | idx = 0; | |
199 | break; | |
200 | } | |
201 | if (IS_ERR(dentry)) { | |
202 | err = PTR_ERR(dentry); | |
203 | goto out; | |
204 | } | |
205 | di = ceph_dentry(dentry); | |
206 | spin_lock(&dentry->d_lock); | |
207 | if (fpos_cmp(di->offset, ctx->pos) < 0) { | |
208 | idx += step + 1; | |
209 | count -= step + 1; | |
210 | } else { | |
211 | count = step; | |
212 | } | |
213 | spin_unlock(&dentry->d_lock); | |
214 | dput(dentry); | |
215 | } | |
2817b000 | 216 | |
c530cd24 | 217 | dout("__dcache_readdir %p cache idx %llu\n", dir, idx); |
2817b000 SW |
218 | } |
219 | ||
fdd4e158 | 220 | |
c530cd24 YZ |
221 | for (;;) { |
222 | bool emit_dentry = false; | |
223 | dentry = __dcache_find_get_entry(parent, idx++, &cache_ctl); | |
224 | if (!dentry) { | |
9cfa1098 | 225 | fi->flags |= CEPH_F_ATEND; |
fdd4e158 YZ |
226 | err = 0; |
227 | break; | |
2817b000 | 228 | } |
c530cd24 YZ |
229 | if (IS_ERR(dentry)) { |
230 | err = PTR_ERR(dentry); | |
231 | goto out; | |
fdd4e158 YZ |
232 | } |
233 | ||
fdd4e158 YZ |
234 | di = ceph_dentry(dentry); |
235 | spin_lock(&dentry->d_lock); | |
a30be7cb | 236 | if (di->lease_shared_gen == shared_gen && |
fdd4e158 | 237 | d_really_is_positive(dentry) && |
fdd4e158 YZ |
238 | fpos_cmp(ctx->pos, di->offset) <= 0) { |
239 | emit_dentry = true; | |
240 | } | |
da502956 | 241 | spin_unlock(&dentry->d_lock); |
2817b000 | 242 | |
fdd4e158 | 243 | if (emit_dentry) { |
f3c4ebe6 | 244 | dout(" %llx dentry %p %pd %p\n", di->offset, |
fdd4e158 YZ |
245 | dentry, dentry, d_inode(dentry)); |
246 | ctx->pos = di->offset; | |
247 | if (!dir_emit(ctx, dentry->d_name.name, | |
248 | dentry->d_name.len, | |
249 | ceph_translate_ino(dentry->d_sb, | |
250 | d_inode(dentry)->i_ino), | |
251 | d_inode(dentry)->i_mode >> 12)) { | |
252 | dput(dentry); | |
253 | err = 0; | |
254 | break; | |
255 | } | |
256 | ctx->pos++; | |
0081bd83 | 257 | |
fdd4e158 YZ |
258 | if (last) |
259 | dput(last); | |
260 | last = dentry; | |
261 | } else { | |
262 | dput(dentry); | |
2817b000 | 263 | } |
fdd4e158 | 264 | } |
c530cd24 | 265 | out: |
fdd4e158 YZ |
266 | ceph_readdir_cache_release(&cache_ctl); |
267 | if (last) { | |
268 | int ret; | |
269 | di = ceph_dentry(last); | |
270 | ret = note_last_dentry(fi, last->d_name.name, last->d_name.len, | |
271 | fpos_off(di->offset) + 1); | |
272 | if (ret < 0) | |
273 | err = ret; | |
2817b000 | 274 | dput(last); |
84583cfb YZ |
275 | /* last_name no longer match cache index */ |
276 | if (fi->readdir_cache_idx >= 0) { | |
277 | fi->readdir_cache_idx = -1; | |
278 | fi->dir_release_count = 0; | |
279 | } | |
fdd4e158 | 280 | } |
2817b000 SW |
281 | return err; |
282 | } | |
283 | ||
f3c4ebe6 YZ |
284 | static bool need_send_readdir(struct ceph_file_info *fi, loff_t pos) |
285 | { | |
286 | if (!fi->last_readdir) | |
287 | return true; | |
288 | if (is_hash_order(pos)) | |
289 | return !ceph_frag_contains_value(fi->frag, fpos_hash(pos)); | |
290 | else | |
291 | return fi->frag != fpos_frag(pos); | |
292 | } | |
293 | ||
77acfa29 | 294 | static int ceph_readdir(struct file *file, struct dir_context *ctx) |
2817b000 | 295 | { |
77acfa29 AV |
296 | struct ceph_file_info *fi = file->private_data; |
297 | struct inode *inode = file_inode(file); | |
2817b000 | 298 | struct ceph_inode_info *ci = ceph_inode(inode); |
3d14c5d2 YS |
299 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
300 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
8974eebd | 301 | int i; |
2817b000 | 302 | int err; |
b50c2de5 | 303 | unsigned frag = -1; |
2817b000 | 304 | struct ceph_mds_reply_info_parsed *rinfo; |
2817b000 | 305 | |
8974eebd | 306 | dout("readdir %p file %p pos %llx\n", inode, file, ctx->pos); |
9cfa1098 | 307 | if (fi->flags & CEPH_F_ATEND) |
2817b000 SW |
308 | return 0; |
309 | ||
310 | /* always start with . and .. */ | |
77acfa29 | 311 | if (ctx->pos == 0) { |
2817b000 | 312 | dout("readdir off 0 -> '.'\n"); |
77acfa29 | 313 | if (!dir_emit(ctx, ".", 1, |
ad1fee96 | 314 | ceph_translate_ino(inode->i_sb, inode->i_ino), |
77acfa29 | 315 | inode->i_mode >> 12)) |
2817b000 | 316 | return 0; |
77acfa29 | 317 | ctx->pos = 1; |
2817b000 | 318 | } |
77acfa29 | 319 | if (ctx->pos == 1) { |
b583043e | 320 | ino_t ino = parent_ino(file->f_path.dentry); |
2817b000 | 321 | dout("readdir off 1 -> '..'\n"); |
77acfa29 | 322 | if (!dir_emit(ctx, "..", 2, |
ad1fee96 | 323 | ceph_translate_ino(inode->i_sb, ino), |
77acfa29 | 324 | inode->i_mode >> 12)) |
2817b000 | 325 | return 0; |
77acfa29 | 326 | ctx->pos = 2; |
2817b000 SW |
327 | } |
328 | ||
329 | /* can we use the dcache? */ | |
be655596 | 330 | spin_lock(&ci->i_ceph_lock); |
fdd4e158 | 331 | if (ceph_test_mount_opt(fsc, DCACHE) && |
3d14c5d2 | 332 | !ceph_test_mount_opt(fsc, NOASYNCREADDIR) && |
a0dff78d | 333 | ceph_snap(inode) != CEPH_SNAPDIR && |
70db4f36 | 334 | __ceph_dir_is_complete_ordered(ci) && |
2817b000 | 335 | __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) { |
a30be7cb | 336 | u32 shared_gen = ci->i_shared_gen; |
be655596 | 337 | spin_unlock(&ci->i_ceph_lock); |
a30be7cb | 338 | err = __dcache_readdir(file, ctx, shared_gen); |
efa4c120 | 339 | if (err != -EAGAIN) |
2817b000 | 340 | return err; |
efa4c120 | 341 | } else { |
be655596 | 342 | spin_unlock(&ci->i_ceph_lock); |
2817b000 | 343 | } |
2817b000 SW |
344 | |
345 | /* proceed with a normal readdir */ | |
2817b000 SW |
346 | more: |
347 | /* do we have the correct frag content buffered? */ | |
f3c4ebe6 | 348 | if (need_send_readdir(fi, ctx->pos)) { |
2817b000 SW |
349 | struct ceph_mds_request *req; |
350 | int op = ceph_snap(inode) == CEPH_SNAPDIR ? | |
351 | CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR; | |
352 | ||
353 | /* discard old result, if any */ | |
393f6620 | 354 | if (fi->last_readdir) { |
2817b000 | 355 | ceph_mdsc_put_request(fi->last_readdir); |
393f6620 SW |
356 | fi->last_readdir = NULL; |
357 | } | |
2817b000 | 358 | |
f3c4ebe6 | 359 | if (is_hash_order(ctx->pos)) { |
b50c2de5 YZ |
360 | /* fragtree isn't always accurate. choose frag |
361 | * based on previous reply when possible. */ | |
362 | if (frag == (unsigned)-1) | |
363 | frag = ceph_choose_frag(ci, fpos_hash(ctx->pos), | |
364 | NULL, NULL); | |
f3c4ebe6 YZ |
365 | } else { |
366 | frag = fpos_frag(ctx->pos); | |
367 | } | |
368 | ||
2817b000 SW |
369 | dout("readdir fetching %llx.%llx frag %x offset '%s'\n", |
370 | ceph_vinop(inode), frag, fi->last_name); | |
371 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
372 | if (IS_ERR(req)) | |
373 | return PTR_ERR(req); | |
54008399 YZ |
374 | err = ceph_alloc_readdir_reply_buffer(req, inode); |
375 | if (err) { | |
376 | ceph_mdsc_put_request(req); | |
377 | return err; | |
378 | } | |
2817b000 SW |
379 | /* hints to request -> mds selection code */ |
380 | req->r_direct_mode = USE_AUTH_MDS; | |
5d37ca14 YZ |
381 | if (op == CEPH_MDS_OP_READDIR) { |
382 | req->r_direct_hash = ceph_frag_value(frag); | |
383 | __set_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags); | |
384 | } | |
a149bb9a | 385 | if (fi->last_name) { |
687265e5 | 386 | req->r_path2 = kstrdup(fi->last_name, GFP_KERNEL); |
a149bb9a SK |
387 | if (!req->r_path2) { |
388 | ceph_mdsc_put_request(req); | |
389 | return -ENOMEM; | |
390 | } | |
79162547 YZ |
391 | } else if (is_hash_order(ctx->pos)) { |
392 | req->r_args.readdir.offset_hash = | |
393 | cpu_to_le32(fpos_hash(ctx->pos)); | |
a149bb9a | 394 | } |
79162547 | 395 | |
fdd4e158 YZ |
396 | req->r_dir_release_cnt = fi->dir_release_count; |
397 | req->r_dir_ordered_cnt = fi->dir_ordered_count; | |
398 | req->r_readdir_cache_idx = fi->readdir_cache_idx; | |
2817b000 SW |
399 | req->r_readdir_offset = fi->next_offset; |
400 | req->r_args.readdir.frag = cpu_to_le32(frag); | |
956d39d6 YZ |
401 | req->r_args.readdir.flags = |
402 | cpu_to_le16(CEPH_READDIR_REPLY_BITFLAGS); | |
a149bb9a SK |
403 | |
404 | req->r_inode = inode; | |
405 | ihold(inode); | |
406 | req->r_dentry = dget(file->f_path.dentry); | |
2817b000 SW |
407 | err = ceph_mdsc_do_request(mdsc, NULL, req); |
408 | if (err < 0) { | |
409 | ceph_mdsc_put_request(req); | |
410 | return err; | |
411 | } | |
f3c4ebe6 YZ |
412 | dout("readdir got and parsed readdir result=%d on " |
413 | "frag %x, end=%d, complete=%d, hash_order=%d\n", | |
414 | err, frag, | |
2817b000 | 415 | (int)req->r_reply_info.dir_end, |
f3c4ebe6 YZ |
416 | (int)req->r_reply_info.dir_complete, |
417 | (int)req->r_reply_info.hash_order); | |
2817b000 | 418 | |
81c6aea5 YZ |
419 | rinfo = &req->r_reply_info; |
420 | if (le32_to_cpu(rinfo->dir_dir->frag) != frag) { | |
421 | frag = le32_to_cpu(rinfo->dir_dir->frag); | |
f3c4ebe6 YZ |
422 | if (!rinfo->hash_order) { |
423 | fi->next_offset = req->r_readdir_offset; | |
424 | /* adjust ctx->pos to beginning of frag */ | |
425 | ctx->pos = ceph_make_fpos(frag, | |
426 | fi->next_offset, | |
427 | false); | |
428 | } | |
81c6aea5 | 429 | } |
fdd4e158 | 430 | |
f0494206 | 431 | fi->frag = frag; |
2817b000 SW |
432 | fi->last_readdir = req; |
433 | ||
bc2de10d | 434 | if (test_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags)) { |
fdd4e158 YZ |
435 | fi->readdir_cache_idx = req->r_readdir_cache_idx; |
436 | if (fi->readdir_cache_idx < 0) { | |
437 | /* preclude from marking dir ordered */ | |
438 | fi->dir_ordered_count = 0; | |
8974eebd YZ |
439 | } else if (ceph_frag_is_leftmost(frag) && |
440 | fi->next_offset == 2) { | |
fdd4e158 YZ |
441 | /* note dir version at start of readdir so |
442 | * we can tell if any dentries get dropped */ | |
443 | fi->dir_release_count = req->r_dir_release_cnt; | |
444 | fi->dir_ordered_count = req->r_dir_ordered_cnt; | |
445 | } | |
446 | } else { | |
447 | dout("readdir !did_prepopulate"); | |
448 | /* disable readdir cache */ | |
449 | fi->readdir_cache_idx = -1; | |
450 | /* preclude from marking dir complete */ | |
451 | fi->dir_release_count = 0; | |
452 | } | |
453 | ||
f3c4ebe6 YZ |
454 | /* note next offset and last dentry name */ |
455 | if (rinfo->dir_nr > 0) { | |
2a5beea3 YZ |
456 | struct ceph_mds_reply_dir_entry *rde = |
457 | rinfo->dir_entries + (rinfo->dir_nr-1); | |
f3c4ebe6 YZ |
458 | unsigned next_offset = req->r_reply_info.dir_end ? |
459 | 2 : (fpos_off(rde->offset) + 1); | |
2a5beea3 | 460 | err = note_last_dentry(fi, rde->name, rde->name_len, |
f3c4ebe6 | 461 | next_offset); |
2817b000 SW |
462 | if (err) |
463 | return err; | |
f3c4ebe6 YZ |
464 | } else if (req->r_reply_info.dir_end) { |
465 | fi->next_offset = 2; | |
466 | /* keep last name */ | |
2817b000 SW |
467 | } |
468 | } | |
469 | ||
470 | rinfo = &fi->last_readdir->r_reply_info; | |
8974eebd | 471 | dout("readdir frag %x num %d pos %llx chunk first %llx\n", |
f3c4ebe6 | 472 | fi->frag, rinfo->dir_nr, ctx->pos, |
8974eebd | 473 | rinfo->dir_nr ? rinfo->dir_entries[0].offset : 0LL); |
77acfa29 | 474 | |
8974eebd YZ |
475 | i = 0; |
476 | /* search start position */ | |
477 | if (rinfo->dir_nr > 0) { | |
478 | int step, nr = rinfo->dir_nr; | |
479 | while (nr > 0) { | |
480 | step = nr >> 1; | |
481 | if (rinfo->dir_entries[i + step].offset < ctx->pos) { | |
482 | i += step + 1; | |
483 | nr -= step + 1; | |
484 | } else { | |
485 | nr = step; | |
486 | } | |
487 | } | |
488 | } | |
489 | for (; i < rinfo->dir_nr; i++) { | |
490 | struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i; | |
3105c19c SW |
491 | struct ceph_vino vino; |
492 | ino_t ino; | |
b50c2de5 | 493 | u32 ftype; |
3105c19c | 494 | |
8974eebd YZ |
495 | BUG_ON(rde->offset < ctx->pos); |
496 | ||
497 | ctx->pos = rde->offset; | |
498 | dout("readdir (%d/%d) -> %llx '%.*s' %p\n", | |
499 | i, rinfo->dir_nr, ctx->pos, | |
2a5beea3 | 500 | rde->name_len, rde->name, &rde->inode.in); |
8974eebd | 501 | |
2a5beea3 YZ |
502 | BUG_ON(!rde->inode.in); |
503 | ftype = le32_to_cpu(rde->inode.in->mode) >> 12; | |
504 | vino.ino = le64_to_cpu(rde->inode.in->ino); | |
505 | vino.snap = le64_to_cpu(rde->inode.in->snapid); | |
3105c19c | 506 | ino = ceph_vino_to_ino(vino); |
8974eebd | 507 | |
2a5beea3 YZ |
508 | if (!dir_emit(ctx, rde->name, rde->name_len, |
509 | ceph_translate_ino(inode->i_sb, ino), ftype)) { | |
2817b000 SW |
510 | dout("filldir stopping us...\n"); |
511 | return 0; | |
512 | } | |
77acfa29 | 513 | ctx->pos++; |
2817b000 SW |
514 | } |
515 | ||
b50c2de5 YZ |
516 | ceph_mdsc_put_request(fi->last_readdir); |
517 | fi->last_readdir = NULL; | |
518 | ||
f3c4ebe6 | 519 | if (fi->next_offset > 2) { |
b50c2de5 | 520 | frag = fi->frag; |
2817b000 SW |
521 | goto more; |
522 | } | |
523 | ||
524 | /* more frags? */ | |
f3c4ebe6 | 525 | if (!ceph_frag_is_rightmost(fi->frag)) { |
b50c2de5 | 526 | frag = ceph_frag_next(fi->frag); |
f3c4ebe6 YZ |
527 | if (is_hash_order(ctx->pos)) { |
528 | loff_t new_pos = ceph_make_fpos(ceph_frag_value(frag), | |
529 | fi->next_offset, true); | |
530 | if (new_pos > ctx->pos) | |
531 | ctx->pos = new_pos; | |
532 | /* keep last_name */ | |
533 | } else { | |
534 | ctx->pos = ceph_make_fpos(frag, fi->next_offset, false); | |
535 | kfree(fi->last_name); | |
536 | fi->last_name = NULL; | |
537 | } | |
2817b000 SW |
538 | dout("readdir next frag is %x\n", frag); |
539 | goto more; | |
540 | } | |
9cfa1098 | 541 | fi->flags |= CEPH_F_ATEND; |
2817b000 SW |
542 | |
543 | /* | |
544 | * if dir_release_count still matches the dir, no dentries | |
545 | * were released during the whole readdir, and we should have | |
546 | * the complete dir contents in our cache. | |
547 | */ | |
fdd4e158 YZ |
548 | if (atomic64_read(&ci->i_release_count) == fi->dir_release_count) { |
549 | spin_lock(&ci->i_ceph_lock); | |
550 | if (fi->dir_ordered_count == atomic64_read(&ci->i_ordered_count)) { | |
70db4f36 | 551 | dout(" marking %p complete and ordered\n", inode); |
fdd4e158 YZ |
552 | /* use i_size to track number of entries in |
553 | * readdir cache */ | |
554 | BUG_ON(fi->readdir_cache_idx < 0); | |
555 | i_size_write(inode, fi->readdir_cache_idx * | |
556 | sizeof(struct dentry*)); | |
557 | } else { | |
70db4f36 | 558 | dout(" marking %p complete\n", inode); |
fdd4e158 | 559 | } |
70db4f36 YZ |
560 | __ceph_dir_set_complete(ci, fi->dir_release_count, |
561 | fi->dir_ordered_count); | |
fdd4e158 | 562 | spin_unlock(&ci->i_ceph_lock); |
2817b000 | 563 | } |
2817b000 | 564 | |
77acfa29 | 565 | dout("readdir %p file %p done.\n", inode, file); |
2817b000 SW |
566 | return 0; |
567 | } | |
568 | ||
8974eebd | 569 | static void reset_readdir(struct ceph_file_info *fi) |
2817b000 SW |
570 | { |
571 | if (fi->last_readdir) { | |
572 | ceph_mdsc_put_request(fi->last_readdir); | |
573 | fi->last_readdir = NULL; | |
574 | } | |
575 | kfree(fi->last_name); | |
a1629c3b | 576 | fi->last_name = NULL; |
fdd4e158 YZ |
577 | fi->dir_release_count = 0; |
578 | fi->readdir_cache_idx = -1; | |
a78600e7 | 579 | fi->next_offset = 2; /* compensate for . and .. */ |
9cfa1098 | 580 | fi->flags &= ~CEPH_F_ATEND; |
2817b000 SW |
581 | } |
582 | ||
8974eebd YZ |
583 | /* |
584 | * discard buffered readdir content on seekdir(0), or seek to new frag, | |
585 | * or seek prior to current chunk | |
586 | */ | |
587 | static bool need_reset_readdir(struct ceph_file_info *fi, loff_t new_pos) | |
588 | { | |
589 | struct ceph_mds_reply_info_parsed *rinfo; | |
f3c4ebe6 | 590 | loff_t chunk_offset; |
8974eebd YZ |
591 | if (new_pos == 0) |
592 | return true; | |
f3c4ebe6 YZ |
593 | if (is_hash_order(new_pos)) { |
594 | /* no need to reset last_name for a forward seek when | |
595 | * dentries are sotred in hash order */ | |
0f5aa88a | 596 | } else if (fi->frag != fpos_frag(new_pos)) { |
8974eebd | 597 | return true; |
f3c4ebe6 | 598 | } |
8974eebd YZ |
599 | rinfo = fi->last_readdir ? &fi->last_readdir->r_reply_info : NULL; |
600 | if (!rinfo || !rinfo->dir_nr) | |
601 | return true; | |
f3c4ebe6 YZ |
602 | chunk_offset = rinfo->dir_entries[0].offset; |
603 | return new_pos < chunk_offset || | |
604 | is_hash_order(new_pos) != is_hash_order(chunk_offset); | |
8974eebd YZ |
605 | } |
606 | ||
965c8e59 | 607 | static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence) |
2817b000 SW |
608 | { |
609 | struct ceph_file_info *fi = file->private_data; | |
610 | struct inode *inode = file->f_mapping->host; | |
2817b000 SW |
611 | loff_t retval; |
612 | ||
5955102c | 613 | inode_lock(inode); |
06222e49 | 614 | retval = -EINVAL; |
965c8e59 | 615 | switch (whence) { |
2817b000 SW |
616 | case SEEK_CUR: |
617 | offset += file->f_pos; | |
06222e49 JB |
618 | case SEEK_SET: |
619 | break; | |
fdd4e158 YZ |
620 | case SEEK_END: |
621 | retval = -EOPNOTSUPP; | |
06222e49 JB |
622 | default: |
623 | goto out; | |
2817b000 | 624 | } |
06222e49 | 625 | |
f0494206 | 626 | if (offset >= 0) { |
f3c4ebe6 YZ |
627 | if (need_reset_readdir(fi, offset)) { |
628 | dout("dir_llseek dropping %p content\n", file); | |
629 | reset_readdir(fi); | |
630 | } else if (is_hash_order(offset) && offset > file->f_pos) { | |
631 | /* for hash offset, we don't know if a forward seek | |
632 | * is within same frag */ | |
633 | fi->dir_release_count = 0; | |
634 | fi->readdir_cache_idx = -1; | |
635 | } | |
636 | ||
2817b000 SW |
637 | if (offset != file->f_pos) { |
638 | file->f_pos = offset; | |
639 | file->f_version = 0; | |
9cfa1098 | 640 | fi->flags &= ~CEPH_F_ATEND; |
2817b000 SW |
641 | } |
642 | retval = offset; | |
2817b000 | 643 | } |
06222e49 | 644 | out: |
5955102c | 645 | inode_unlock(inode); |
2817b000 SW |
646 | return retval; |
647 | } | |
648 | ||
649 | /* | |
468640e3 | 650 | * Handle lookups for the hidden .snap directory. |
2817b000 | 651 | */ |
468640e3 SW |
652 | int ceph_handle_snapdir(struct ceph_mds_request *req, |
653 | struct dentry *dentry, int err) | |
2817b000 | 654 | { |
3d14c5d2 | 655 | struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); |
2b0143b5 | 656 | struct inode *parent = d_inode(dentry->d_parent); /* we hold i_mutex */ |
2817b000 SW |
657 | |
658 | /* .snap dir? */ | |
659 | if (err == -ENOENT && | |
455cec0a | 660 | ceph_snap(parent) == CEPH_NOSNAP && |
6b805185 | 661 | strcmp(dentry->d_name.name, |
3d14c5d2 | 662 | fsc->mount_options->snapdir_name) == 0) { |
2817b000 | 663 | struct inode *inode = ceph_get_snapdir(parent); |
a455589f AV |
664 | dout("ENOENT on snapdir %p '%pd', linking to snapdir %p\n", |
665 | dentry, dentry, inode); | |
9358c6d4 | 666 | BUG_ON(!d_unhashed(dentry)); |
2817b000 SW |
667 | d_add(dentry, inode); |
668 | err = 0; | |
669 | } | |
468640e3 SW |
670 | return err; |
671 | } | |
2817b000 | 672 | |
468640e3 SW |
673 | /* |
674 | * Figure out final result of a lookup/open request. | |
675 | * | |
676 | * Mainly, make sure we return the final req->r_dentry (if it already | |
677 | * existed) in place of the original VFS-provided dentry when they | |
678 | * differ. | |
679 | * | |
680 | * Gracefully handle the case where the MDS replies with -ENOENT and | |
681 | * no trace (which it may do, at its discretion, e.g., if it doesn't | |
682 | * care to issue a lease on the negative dentry). | |
683 | */ | |
684 | struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, | |
685 | struct dentry *dentry, int err) | |
686 | { | |
2817b000 SW |
687 | if (err == -ENOENT) { |
688 | /* no trace? */ | |
689 | err = 0; | |
690 | if (!req->r_reply_info.head->is_dentry) { | |
691 | dout("ENOENT and no trace, dentry %p inode %p\n", | |
2b0143b5 DH |
692 | dentry, d_inode(dentry)); |
693 | if (d_really_is_positive(dentry)) { | |
2817b000 SW |
694 | d_drop(dentry); |
695 | err = -ENOENT; | |
696 | } else { | |
697 | d_add(dentry, NULL); | |
698 | } | |
699 | } | |
700 | } | |
701 | if (err) | |
702 | dentry = ERR_PTR(err); | |
703 | else if (dentry != req->r_dentry) | |
704 | dentry = dget(req->r_dentry); /* we got spliced */ | |
705 | else | |
706 | dentry = NULL; | |
707 | return dentry; | |
708 | } | |
709 | ||
3b33f692 | 710 | static bool is_root_ceph_dentry(struct inode *inode, struct dentry *dentry) |
1d1de916 SW |
711 | { |
712 | return ceph_ino(inode) == CEPH_INO_ROOT && | |
713 | strncmp(dentry->d_name.name, ".ceph", 5) == 0; | |
714 | } | |
715 | ||
2817b000 SW |
716 | /* |
717 | * Look up a single dir entry. If there is a lookup intent, inform | |
718 | * the MDS so that it gets our 'caps wanted' value in a single op. | |
719 | */ | |
720 | static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry, | |
00cd8dd3 | 721 | unsigned int flags) |
2817b000 | 722 | { |
3d14c5d2 YS |
723 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
724 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
725 | struct ceph_mds_request *req; |
726 | int op; | |
315f2408 | 727 | int mask; |
2817b000 SW |
728 | int err; |
729 | ||
a455589f AV |
730 | dout("lookup %p dentry %p '%pd'\n", |
731 | dir, dentry, dentry); | |
2817b000 SW |
732 | |
733 | if (dentry->d_name.len > NAME_MAX) | |
734 | return ERR_PTR(-ENAMETOOLONG); | |
735 | ||
2817b000 | 736 | /* can we conclude ENOENT locally? */ |
2b0143b5 | 737 | if (d_really_is_negative(dentry)) { |
2817b000 SW |
738 | struct ceph_inode_info *ci = ceph_inode(dir); |
739 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
740 | ||
be655596 | 741 | spin_lock(&ci->i_ceph_lock); |
2817b000 SW |
742 | dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags); |
743 | if (strncmp(dentry->d_name.name, | |
3d14c5d2 | 744 | fsc->mount_options->snapdir_name, |
2817b000 | 745 | dentry->d_name.len) && |
1d1de916 | 746 | !is_root_ceph_dentry(dir, dentry) && |
e2c3de04 | 747 | ceph_test_mount_opt(fsc, DCACHE) && |
2f276c51 | 748 | __ceph_dir_is_complete(ci) && |
2817b000 | 749 | (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) { |
be655596 | 750 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
751 | dout(" dir %p complete, -ENOENT\n", dir); |
752 | d_add(dentry, NULL); | |
753 | di->lease_shared_gen = ci->i_shared_gen; | |
754 | return NULL; | |
755 | } | |
be655596 | 756 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
757 | } |
758 | ||
759 | op = ceph_snap(dir) == CEPH_SNAPDIR ? | |
760 | CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; | |
761 | req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); | |
762 | if (IS_ERR(req)) | |
7e34bc52 | 763 | return ERR_CAST(req); |
2817b000 SW |
764 | req->r_dentry = dget(dentry); |
765 | req->r_num_caps = 2; | |
315f2408 YZ |
766 | |
767 | mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED; | |
768 | if (ceph_security_xattr_wanted(dir)) | |
769 | mask |= CEPH_CAP_XATTR_SHARED; | |
770 | req->r_args.getattr.mask = cpu_to_le32(mask); | |
771 | ||
3dd69aab JL |
772 | req->r_parent = dir; |
773 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); | |
2817b000 | 774 | err = ceph_mdsc_do_request(mdsc, NULL, req); |
468640e3 | 775 | err = ceph_handle_snapdir(req, dentry, err); |
2817b000 SW |
776 | dentry = ceph_finish_lookup(req, dentry, err); |
777 | ceph_mdsc_put_request(req); /* will dput(dentry) */ | |
778 | dout("lookup result=%p\n", dentry); | |
779 | return dentry; | |
780 | } | |
781 | ||
782 | /* | |
783 | * If we do a create but get no trace back from the MDS, follow up with | |
784 | * a lookup (the VFS expects us to link up the provided dentry). | |
785 | */ | |
786 | int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry) | |
787 | { | |
00cd8dd3 | 788 | struct dentry *result = ceph_lookup(dir, dentry, 0); |
2817b000 SW |
789 | |
790 | if (result && !IS_ERR(result)) { | |
791 | /* | |
792 | * We created the item, then did a lookup, and found | |
793 | * it was already linked to another inode we already | |
4d41cef2 YZ |
794 | * had in our cache (and thus got spliced). To not |
795 | * confuse VFS (especially when inode is a directory), | |
796 | * we don't link our dentry to that inode, return an | |
797 | * error instead. | |
798 | * | |
799 | * This event should be rare and it happens only when | |
800 | * we talk to old MDS. Recent MDS does not send traceless | |
801 | * reply for request that creates new inode. | |
2817b000 | 802 | */ |
5cba372c | 803 | d_drop(result); |
4d41cef2 | 804 | return -ESTALE; |
2817b000 SW |
805 | } |
806 | return PTR_ERR(result); | |
807 | } | |
808 | ||
809 | static int ceph_mknod(struct inode *dir, struct dentry *dentry, | |
1a67aafb | 810 | umode_t mode, dev_t rdev) |
2817b000 | 811 | { |
3d14c5d2 YS |
812 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
813 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 | 814 | struct ceph_mds_request *req; |
b1ee94aa | 815 | struct ceph_acls_info acls = {}; |
2817b000 SW |
816 | int err; |
817 | ||
818 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
819 | return -EROFS; | |
820 | ||
b1ee94aa YZ |
821 | err = ceph_pre_init_acls(dir, &mode, &acls); |
822 | if (err < 0) | |
823 | return err; | |
824 | ||
1a67aafb | 825 | dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n", |
2817b000 SW |
826 | dir, dentry, mode, rdev); |
827 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS); | |
828 | if (IS_ERR(req)) { | |
b1ee94aa YZ |
829 | err = PTR_ERR(req); |
830 | goto out; | |
2817b000 SW |
831 | } |
832 | req->r_dentry = dget(dentry); | |
833 | req->r_num_caps = 2; | |
3dd69aab JL |
834 | req->r_parent = dir; |
835 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); | |
2817b000 SW |
836 | req->r_args.mknod.mode = cpu_to_le32(mode); |
837 | req->r_args.mknod.rdev = cpu_to_le32(rdev); | |
838 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
839 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
b1ee94aa YZ |
840 | if (acls.pagelist) { |
841 | req->r_pagelist = acls.pagelist; | |
842 | acls.pagelist = NULL; | |
843 | } | |
2817b000 SW |
844 | err = ceph_mdsc_do_request(mdsc, dir, req); |
845 | if (!err && !req->r_reply_info.head->is_dentry) | |
846 | err = ceph_handle_notrace_create(dir, dentry); | |
847 | ceph_mdsc_put_request(req); | |
b1ee94aa | 848 | out: |
7221fe4c | 849 | if (!err) |
2b0143b5 | 850 | ceph_init_inode_acls(d_inode(dentry), &acls); |
b20a95a0 | 851 | else |
2817b000 | 852 | d_drop(dentry); |
b1ee94aa | 853 | ceph_release_acls_info(&acls); |
2817b000 SW |
854 | return err; |
855 | } | |
856 | ||
4acdaf27 | 857 | static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 858 | bool excl) |
2817b000 | 859 | { |
2d83bde9 | 860 | return ceph_mknod(dir, dentry, mode, 0); |
2817b000 SW |
861 | } |
862 | ||
863 | static int ceph_symlink(struct inode *dir, struct dentry *dentry, | |
864 | const char *dest) | |
865 | { | |
3d14c5d2 YS |
866 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
867 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
868 | struct ceph_mds_request *req; |
869 | int err; | |
870 | ||
871 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
872 | return -EROFS; | |
873 | ||
874 | dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest); | |
875 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS); | |
876 | if (IS_ERR(req)) { | |
b1ee94aa YZ |
877 | err = PTR_ERR(req); |
878 | goto out; | |
2817b000 | 879 | } |
687265e5 | 880 | req->r_path2 = kstrdup(dest, GFP_KERNEL); |
a149bb9a SK |
881 | if (!req->r_path2) { |
882 | err = -ENOMEM; | |
883 | ceph_mdsc_put_request(req); | |
884 | goto out; | |
885 | } | |
3dd69aab JL |
886 | req->r_parent = dir; |
887 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); | |
a149bb9a SK |
888 | req->r_dentry = dget(dentry); |
889 | req->r_num_caps = 2; | |
2817b000 SW |
890 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; |
891 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
892 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
893 | if (!err && !req->r_reply_info.head->is_dentry) | |
894 | err = ceph_handle_notrace_create(dir, dentry); | |
895 | ceph_mdsc_put_request(req); | |
b1ee94aa YZ |
896 | out: |
897 | if (err) | |
2817b000 SW |
898 | d_drop(dentry); |
899 | return err; | |
900 | } | |
901 | ||
18bb1db3 | 902 | static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
2817b000 | 903 | { |
3d14c5d2 YS |
904 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
905 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 | 906 | struct ceph_mds_request *req; |
b1ee94aa | 907 | struct ceph_acls_info acls = {}; |
2817b000 SW |
908 | int err = -EROFS; |
909 | int op; | |
910 | ||
911 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
912 | /* mkdir .snap/foo is a MKSNAP */ | |
913 | op = CEPH_MDS_OP_MKSNAP; | |
a455589f AV |
914 | dout("mksnap dir %p snap '%pd' dn %p\n", dir, |
915 | dentry, dentry); | |
2817b000 | 916 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { |
18bb1db3 | 917 | dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode); |
2817b000 SW |
918 | op = CEPH_MDS_OP_MKDIR; |
919 | } else { | |
920 | goto out; | |
921 | } | |
b1ee94aa YZ |
922 | |
923 | mode |= S_IFDIR; | |
924 | err = ceph_pre_init_acls(dir, &mode, &acls); | |
925 | if (err < 0) | |
926 | goto out; | |
927 | ||
2817b000 SW |
928 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); |
929 | if (IS_ERR(req)) { | |
930 | err = PTR_ERR(req); | |
931 | goto out; | |
932 | } | |
933 | ||
934 | req->r_dentry = dget(dentry); | |
935 | req->r_num_caps = 2; | |
3dd69aab JL |
936 | req->r_parent = dir; |
937 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); | |
2817b000 SW |
938 | req->r_args.mkdir.mode = cpu_to_le32(mode); |
939 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
940 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
b1ee94aa YZ |
941 | if (acls.pagelist) { |
942 | req->r_pagelist = acls.pagelist; | |
943 | acls.pagelist = NULL; | |
944 | } | |
2817b000 | 945 | err = ceph_mdsc_do_request(mdsc, dir, req); |
275dd19e YZ |
946 | if (!err && |
947 | !req->r_reply_info.head->is_target && | |
948 | !req->r_reply_info.head->is_dentry) | |
2817b000 SW |
949 | err = ceph_handle_notrace_create(dir, dentry); |
950 | ceph_mdsc_put_request(req); | |
951 | out: | |
b20a95a0 | 952 | if (!err) |
2b0143b5 | 953 | ceph_init_inode_acls(d_inode(dentry), &acls); |
b20a95a0 | 954 | else |
2817b000 | 955 | d_drop(dentry); |
b1ee94aa | 956 | ceph_release_acls_info(&acls); |
2817b000 SW |
957 | return err; |
958 | } | |
959 | ||
960 | static int ceph_link(struct dentry *old_dentry, struct inode *dir, | |
961 | struct dentry *dentry) | |
962 | { | |
3d14c5d2 YS |
963 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
964 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
965 | struct ceph_mds_request *req; |
966 | int err; | |
967 | ||
968 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
969 | return -EROFS; | |
970 | ||
971 | dout("link in dir %p old_dentry %p dentry %p\n", dir, | |
972 | old_dentry, dentry); | |
973 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS); | |
974 | if (IS_ERR(req)) { | |
975 | d_drop(dentry); | |
976 | return PTR_ERR(req); | |
977 | } | |
978 | req->r_dentry = dget(dentry); | |
979 | req->r_num_caps = 2; | |
4b58c9b1 | 980 | req->r_old_dentry = dget(old_dentry); |
3dd69aab JL |
981 | req->r_parent = dir; |
982 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); | |
2817b000 SW |
983 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; |
984 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
ad88f23f YZ |
985 | /* release LINK_SHARED on source inode (mds will lock it) */ |
986 | req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; | |
2817b000 | 987 | err = ceph_mdsc_do_request(mdsc, dir, req); |
70b666c3 | 988 | if (err) { |
2817b000 | 989 | d_drop(dentry); |
70b666c3 | 990 | } else if (!req->r_reply_info.head->is_dentry) { |
2b0143b5 DH |
991 | ihold(d_inode(old_dentry)); |
992 | d_instantiate(dentry, d_inode(old_dentry)); | |
70b666c3 | 993 | } |
2817b000 SW |
994 | ceph_mdsc_put_request(req); |
995 | return err; | |
996 | } | |
997 | ||
998 | /* | |
999 | * For a soon-to-be unlinked file, drop the AUTH_RDCACHE caps. If it | |
1000 | * looks like the link count will hit 0, drop any other caps (other | |
1001 | * than PIN) we don't specifically want (due to the file still being | |
1002 | * open). | |
1003 | */ | |
1004 | static int drop_caps_for_unlink(struct inode *inode) | |
1005 | { | |
1006 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1007 | int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; | |
1008 | ||
be655596 | 1009 | spin_lock(&ci->i_ceph_lock); |
2817b000 SW |
1010 | if (inode->i_nlink == 1) { |
1011 | drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN); | |
1012 | ci->i_ceph_flags |= CEPH_I_NODELAY; | |
1013 | } | |
be655596 | 1014 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
1015 | return drop; |
1016 | } | |
1017 | ||
1018 | /* | |
1019 | * rmdir and unlink are differ only by the metadata op code | |
1020 | */ | |
1021 | static int ceph_unlink(struct inode *dir, struct dentry *dentry) | |
1022 | { | |
3d14c5d2 YS |
1023 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
1024 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2b0143b5 | 1025 | struct inode *inode = d_inode(dentry); |
2817b000 SW |
1026 | struct ceph_mds_request *req; |
1027 | int err = -EROFS; | |
1028 | int op; | |
1029 | ||
1030 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
1031 | /* rmdir .snap/foo is RMSNAP */ | |
a455589f | 1032 | dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry); |
2817b000 SW |
1033 | op = CEPH_MDS_OP_RMSNAP; |
1034 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { | |
1035 | dout("unlink/rmdir dir %p dn %p inode %p\n", | |
1036 | dir, dentry, inode); | |
e36cb0b8 | 1037 | op = d_is_dir(dentry) ? |
2817b000 SW |
1038 | CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK; |
1039 | } else | |
1040 | goto out; | |
1041 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
1042 | if (IS_ERR(req)) { | |
1043 | err = PTR_ERR(req); | |
1044 | goto out; | |
1045 | } | |
1046 | req->r_dentry = dget(dentry); | |
1047 | req->r_num_caps = 2; | |
3dd69aab JL |
1048 | req->r_parent = dir; |
1049 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); | |
2817b000 SW |
1050 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; |
1051 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
1052 | req->r_inode_drop = drop_caps_for_unlink(inode); | |
1053 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
1054 | if (!err && !req->r_reply_info.head->is_dentry) | |
1055 | d_delete(dentry); | |
1056 | ceph_mdsc_put_request(req); | |
1057 | out: | |
1058 | return err; | |
1059 | } | |
1060 | ||
1061 | static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1cd66c93 MS |
1062 | struct inode *new_dir, struct dentry *new_dentry, |
1063 | unsigned int flags) | |
2817b000 | 1064 | { |
3d14c5d2 YS |
1065 | struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb); |
1066 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 | 1067 | struct ceph_mds_request *req; |
0ea611a3 | 1068 | int op = CEPH_MDS_OP_RENAME; |
2817b000 SW |
1069 | int err; |
1070 | ||
1cd66c93 MS |
1071 | if (flags) |
1072 | return -EINVAL; | |
1073 | ||
2817b000 SW |
1074 | if (ceph_snap(old_dir) != ceph_snap(new_dir)) |
1075 | return -EXDEV; | |
0ea611a3 YZ |
1076 | if (ceph_snap(old_dir) != CEPH_NOSNAP) { |
1077 | if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR) | |
1078 | op = CEPH_MDS_OP_RENAMESNAP; | |
1079 | else | |
1080 | return -EROFS; | |
1081 | } | |
2817b000 SW |
1082 | dout("rename dir %p dentry %p to dir %p dentry %p\n", |
1083 | old_dir, old_dentry, new_dir, new_dentry); | |
0ea611a3 | 1084 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); |
2817b000 SW |
1085 | if (IS_ERR(req)) |
1086 | return PTR_ERR(req); | |
180061a5 | 1087 | ihold(old_dir); |
2817b000 SW |
1088 | req->r_dentry = dget(new_dentry); |
1089 | req->r_num_caps = 2; | |
1090 | req->r_old_dentry = dget(old_dentry); | |
180061a5 | 1091 | req->r_old_dentry_dir = old_dir; |
3dd69aab JL |
1092 | req->r_parent = new_dir; |
1093 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); | |
2817b000 SW |
1094 | req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED; |
1095 | req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL; | |
1096 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
1097 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
1098 | /* release LINK_RDCACHE on source inode (mds will lock it) */ | |
1099 | req->r_old_inode_drop = CEPH_CAP_LINK_SHARED; | |
2b0143b5 DH |
1100 | if (d_really_is_positive(new_dentry)) |
1101 | req->r_inode_drop = drop_caps_for_unlink(d_inode(new_dentry)); | |
2817b000 SW |
1102 | err = ceph_mdsc_do_request(mdsc, old_dir, req); |
1103 | if (!err && !req->r_reply_info.head->is_dentry) { | |
1104 | /* | |
1105 | * Normally d_move() is done by fill_trace (called by | |
1106 | * do_request, above). If there is no trace, we need | |
1107 | * to do it here. | |
1108 | */ | |
ea1409f9 | 1109 | |
fdd4e158 YZ |
1110 | /* d_move screws up sibling dentries' offsets */ |
1111 | ceph_dir_clear_complete(old_dir); | |
1112 | ceph_dir_clear_complete(new_dir); | |
1113 | ||
2817b000 | 1114 | d_move(old_dentry, new_dentry); |
ea1409f9 SW |
1115 | |
1116 | /* ensure target dentry is invalidated, despite | |
1117 | rehashing bug in vfs_rename_dir */ | |
81a6cf2d | 1118 | ceph_invalidate_dentry_lease(new_dentry); |
2817b000 SW |
1119 | } |
1120 | ceph_mdsc_put_request(req); | |
1121 | return err; | |
1122 | } | |
1123 | ||
81a6cf2d SW |
1124 | /* |
1125 | * Ensure a dentry lease will no longer revalidate. | |
1126 | */ | |
1127 | void ceph_invalidate_dentry_lease(struct dentry *dentry) | |
1128 | { | |
1129 | spin_lock(&dentry->d_lock); | |
9b16f03c | 1130 | ceph_dentry(dentry)->time = jiffies; |
81a6cf2d SW |
1131 | ceph_dentry(dentry)->lease_shared_gen = 0; |
1132 | spin_unlock(&dentry->d_lock); | |
1133 | } | |
2817b000 SW |
1134 | |
1135 | /* | |
1136 | * Check if dentry lease is valid. If not, delete the lease. Try to | |
1137 | * renew if the least is more than half up. | |
1138 | */ | |
14fb9c9e JL |
1139 | static int dentry_lease_is_valid(struct dentry *dentry, unsigned int flags, |
1140 | struct inode *dir) | |
2817b000 SW |
1141 | { |
1142 | struct ceph_dentry_info *di; | |
1143 | struct ceph_mds_session *s; | |
1144 | int valid = 0; | |
1145 | u32 gen; | |
1146 | unsigned long ttl; | |
1147 | struct ceph_mds_session *session = NULL; | |
2817b000 SW |
1148 | u32 seq = 0; |
1149 | ||
1150 | spin_lock(&dentry->d_lock); | |
1151 | di = ceph_dentry(dentry); | |
14fb9c9e | 1152 | if (di && di->lease_session) { |
2817b000 | 1153 | s = di->lease_session; |
d8fb02ab | 1154 | spin_lock(&s->s_gen_ttl_lock); |
2817b000 SW |
1155 | gen = s->s_cap_gen; |
1156 | ttl = s->s_cap_ttl; | |
d8fb02ab | 1157 | spin_unlock(&s->s_gen_ttl_lock); |
2817b000 SW |
1158 | |
1159 | if (di->lease_gen == gen && | |
9b16f03c | 1160 | time_before(jiffies, di->time) && |
2817b000 SW |
1161 | time_before(jiffies, ttl)) { |
1162 | valid = 1; | |
1163 | if (di->lease_renew_after && | |
1164 | time_after(jiffies, di->lease_renew_after)) { | |
14fb9c9e JL |
1165 | /* |
1166 | * We should renew. If we're in RCU walk mode | |
1167 | * though, we can't do that so just return | |
1168 | * -ECHILD. | |
1169 | */ | |
1170 | if (flags & LOOKUP_RCU) { | |
1171 | valid = -ECHILD; | |
1172 | } else { | |
1173 | session = ceph_get_mds_session(s); | |
1174 | seq = di->lease_seq; | |
1175 | di->lease_renew_after = 0; | |
1176 | di->lease_renew_from = jiffies; | |
1177 | } | |
2817b000 | 1178 | } |
2817b000 SW |
1179 | } |
1180 | } | |
1181 | spin_unlock(&dentry->d_lock); | |
1182 | ||
1183 | if (session) { | |
1184 | ceph_mdsc_lease_send_msg(session, dir, dentry, | |
1185 | CEPH_MDS_LEASE_RENEW, seq); | |
1186 | ceph_put_mds_session(session); | |
1187 | } | |
1188 | dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid); | |
1189 | return valid; | |
1190 | } | |
1191 | ||
1192 | /* | |
1193 | * Check if directory-wide content lease/cap is valid. | |
1194 | */ | |
1195 | static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry) | |
1196 | { | |
1197 | struct ceph_inode_info *ci = ceph_inode(dir); | |
1198 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
1199 | int valid = 0; | |
1200 | ||
be655596 | 1201 | spin_lock(&ci->i_ceph_lock); |
2817b000 SW |
1202 | if (ci->i_shared_gen == di->lease_shared_gen) |
1203 | valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1); | |
be655596 | 1204 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
1205 | dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n", |
1206 | dir, (unsigned)ci->i_shared_gen, dentry, | |
1207 | (unsigned)di->lease_shared_gen, valid); | |
1208 | return valid; | |
1209 | } | |
1210 | ||
1211 | /* | |
1212 | * Check if cached dentry can be trusted. | |
1213 | */ | |
0b728e19 | 1214 | static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags) |
2817b000 | 1215 | { |
bf1c6aca | 1216 | int valid = 0; |
641235d8 | 1217 | struct dentry *parent; |
34286d66 NP |
1218 | struct inode *dir; |
1219 | ||
f49d1e05 | 1220 | if (flags & LOOKUP_RCU) { |
52953d55 | 1221 | parent = READ_ONCE(dentry->d_parent); |
f49d1e05 JL |
1222 | dir = d_inode_rcu(parent); |
1223 | if (!dir) | |
1224 | return -ECHILD; | |
1225 | } else { | |
1226 | parent = dget_parent(dentry); | |
1227 | dir = d_inode(parent); | |
1228 | } | |
34286d66 | 1229 | |
a455589f | 1230 | dout("d_revalidate %p '%pd' inode %p offset %lld\n", dentry, |
2b0143b5 | 1231 | dentry, d_inode(dentry), ceph_dentry(dentry)->offset); |
2817b000 SW |
1232 | |
1233 | /* always trust cached snapped dentries, snapdir dentry */ | |
1234 | if (ceph_snap(dir) != CEPH_NOSNAP) { | |
a455589f | 1235 | dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry, |
2b0143b5 | 1236 | dentry, d_inode(dentry)); |
bf1c6aca | 1237 | valid = 1; |
2b0143b5 DH |
1238 | } else if (d_really_is_positive(dentry) && |
1239 | ceph_snap(d_inode(dentry)) == CEPH_SNAPDIR) { | |
bf1c6aca | 1240 | valid = 1; |
14fb9c9e JL |
1241 | } else { |
1242 | valid = dentry_lease_is_valid(dentry, flags, dir); | |
1243 | if (valid == -ECHILD) | |
1244 | return valid; | |
1245 | if (valid || dir_lease_is_valid(dir, dentry)) { | |
1246 | if (d_really_is_positive(dentry)) | |
1247 | valid = ceph_is_any_caps(d_inode(dentry)); | |
1248 | else | |
1249 | valid = 1; | |
1250 | } | |
2817b000 | 1251 | } |
2817b000 | 1252 | |
200fd27c YZ |
1253 | if (!valid) { |
1254 | struct ceph_mds_client *mdsc = | |
1255 | ceph_sb_to_client(dir->i_sb)->mdsc; | |
1256 | struct ceph_mds_request *req; | |
1097680d JL |
1257 | int op, err; |
1258 | u32 mask; | |
200fd27c | 1259 | |
f49d1e05 JL |
1260 | if (flags & LOOKUP_RCU) |
1261 | return -ECHILD; | |
1262 | ||
200fd27c | 1263 | op = ceph_snap(dir) == CEPH_SNAPDIR ? |
5eb9f604 | 1264 | CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; |
200fd27c YZ |
1265 | req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); |
1266 | if (!IS_ERR(req)) { | |
1267 | req->r_dentry = dget(dentry); | |
5eb9f604 JL |
1268 | req->r_num_caps = 2; |
1269 | req->r_parent = dir; | |
200fd27c YZ |
1270 | |
1271 | mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED; | |
1272 | if (ceph_security_xattr_wanted(dir)) | |
1273 | mask |= CEPH_CAP_XATTR_SHARED; | |
1097680d | 1274 | req->r_args.getattr.mask = cpu_to_le32(mask); |
200fd27c | 1275 | |
200fd27c | 1276 | err = ceph_mdsc_do_request(mdsc, NULL, req); |
c3f4688a JL |
1277 | switch (err) { |
1278 | case 0: | |
1279 | if (d_really_is_positive(dentry) && | |
1280 | d_inode(dentry) == req->r_target_inode) | |
1281 | valid = 1; | |
1282 | break; | |
1283 | case -ENOENT: | |
1284 | if (d_really_is_negative(dentry)) | |
1285 | valid = 1; | |
1286 | /* Fallthrough */ | |
1287 | default: | |
1288 | break; | |
200fd27c YZ |
1289 | } |
1290 | ceph_mdsc_put_request(req); | |
1291 | dout("d_revalidate %p lookup result=%d\n", | |
1292 | dentry, err); | |
1293 | } | |
1294 | } | |
1295 | ||
bf1c6aca | 1296 | dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid"); |
9215aeea | 1297 | if (valid) { |
bf1c6aca | 1298 | ceph_dentry_lru_touch(dentry); |
9215aeea YZ |
1299 | } else { |
1300 | ceph_dir_clear_complete(dir); | |
9215aeea | 1301 | } |
641235d8 | 1302 | |
f49d1e05 JL |
1303 | if (!(flags & LOOKUP_RCU)) |
1304 | dput(parent); | |
bf1c6aca | 1305 | return valid; |
2817b000 SW |
1306 | } |
1307 | ||
1308 | /* | |
147851d2 | 1309 | * Release our ceph_dentry_info. |
2817b000 | 1310 | */ |
147851d2 | 1311 | static void ceph_d_release(struct dentry *dentry) |
2817b000 SW |
1312 | { |
1313 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
2817b000 | 1314 | |
147851d2 | 1315 | dout("d_release %p\n", dentry); |
3d8eb7a9 | 1316 | ceph_dentry_lru_del(dentry); |
5b484a51 JL |
1317 | |
1318 | spin_lock(&dentry->d_lock); | |
1319 | dentry->d_fsdata = NULL; | |
1320 | spin_unlock(&dentry->d_lock); | |
1321 | ||
3d8eb7a9 SW |
1322 | if (di->lease_session) |
1323 | ceph_put_mds_session(di->lease_session); | |
1324 | kmem_cache_free(ceph_dentry_cachep, di); | |
2817b000 SW |
1325 | } |
1326 | ||
b58dc410 SW |
1327 | /* |
1328 | * When the VFS prunes a dentry from the cache, we need to clear the | |
1329 | * complete flag on the parent directory. | |
1330 | * | |
1331 | * Called under dentry->d_lock. | |
1332 | */ | |
1333 | static void ceph_d_prune(struct dentry *dentry) | |
1334 | { | |
774ac21d | 1335 | dout("ceph_d_prune %p\n", dentry); |
b58dc410 SW |
1336 | |
1337 | /* do we have a valid parent? */ | |
8842b3be | 1338 | if (IS_ROOT(dentry)) |
b58dc410 SW |
1339 | return; |
1340 | ||
2f276c51 | 1341 | /* if we are not hashed, we don't affect dir's completeness */ |
b58dc410 SW |
1342 | if (d_unhashed(dentry)) |
1343 | return; | |
2817b000 | 1344 | |
18fc8abd AV |
1345 | if (ceph_snap(d_inode(dentry->d_parent)) == CEPH_SNAPDIR) |
1346 | return; | |
1347 | ||
b58dc410 SW |
1348 | /* |
1349 | * we hold d_lock, so d_parent is stable, and d_fsdata is never | |
1350 | * cleared until d_release | |
1351 | */ | |
2b0143b5 | 1352 | ceph_dir_clear_complete(d_inode(dentry->d_parent)); |
b58dc410 | 1353 | } |
2817b000 SW |
1354 | |
1355 | /* | |
1356 | * read() on a dir. This weird interface hack only works if mounted | |
1357 | * with '-o dirstat'. | |
1358 | */ | |
1359 | static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, | |
1360 | loff_t *ppos) | |
1361 | { | |
1362 | struct ceph_file_info *cf = file->private_data; | |
496ad9aa | 1363 | struct inode *inode = file_inode(file); |
2817b000 SW |
1364 | struct ceph_inode_info *ci = ceph_inode(inode); |
1365 | int left; | |
ae598083 | 1366 | const int bufsize = 1024; |
2817b000 | 1367 | |
3d14c5d2 | 1368 | if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT)) |
2817b000 SW |
1369 | return -EISDIR; |
1370 | ||
1371 | if (!cf->dir_info) { | |
687265e5 | 1372 | cf->dir_info = kmalloc(bufsize, GFP_KERNEL); |
2817b000 SW |
1373 | if (!cf->dir_info) |
1374 | return -ENOMEM; | |
1375 | cf->dir_info_len = | |
ae598083 | 1376 | snprintf(cf->dir_info, bufsize, |
2817b000 SW |
1377 | "entries: %20lld\n" |
1378 | " files: %20lld\n" | |
1379 | " subdirs: %20lld\n" | |
1380 | "rentries: %20lld\n" | |
1381 | " rfiles: %20lld\n" | |
1382 | " rsubdirs: %20lld\n" | |
1383 | "rbytes: %20lld\n" | |
1384 | "rctime: %10ld.%09ld\n", | |
1385 | ci->i_files + ci->i_subdirs, | |
1386 | ci->i_files, | |
1387 | ci->i_subdirs, | |
1388 | ci->i_rfiles + ci->i_rsubdirs, | |
1389 | ci->i_rfiles, | |
1390 | ci->i_rsubdirs, | |
1391 | ci->i_rbytes, | |
1392 | (long)ci->i_rctime.tv_sec, | |
1393 | (long)ci->i_rctime.tv_nsec); | |
1394 | } | |
1395 | ||
1396 | if (*ppos >= cf->dir_info_len) | |
1397 | return 0; | |
1398 | size = min_t(unsigned, size, cf->dir_info_len-*ppos); | |
1399 | left = copy_to_user(buf, cf->dir_info + *ppos, size); | |
1400 | if (left == size) | |
1401 | return -EFAULT; | |
1402 | *ppos += (size - left); | |
1403 | return size - left; | |
1404 | } | |
1405 | ||
2817b000 SW |
1406 | /* |
1407 | * We maintain a private dentry LRU. | |
1408 | * | |
1409 | * FIXME: this needs to be changed to a per-mds lru to be useful. | |
1410 | */ | |
1411 | void ceph_dentry_lru_add(struct dentry *dn) | |
1412 | { | |
1413 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1414 | struct ceph_mds_client *mdsc; | |
2817b000 | 1415 | |
a455589f | 1416 | dout("dentry_lru_add %p %p '%pd'\n", di, dn, dn); |
3d8eb7a9 SW |
1417 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
1418 | spin_lock(&mdsc->dentry_lru_lock); | |
1419 | list_add_tail(&di->lru, &mdsc->dentry_lru); | |
1420 | mdsc->num_dentry++; | |
1421 | spin_unlock(&mdsc->dentry_lru_lock); | |
2817b000 SW |
1422 | } |
1423 | ||
1424 | void ceph_dentry_lru_touch(struct dentry *dn) | |
1425 | { | |
1426 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1427 | struct ceph_mds_client *mdsc; | |
2817b000 | 1428 | |
a455589f AV |
1429 | dout("dentry_lru_touch %p %p '%pd' (offset %lld)\n", di, dn, dn, |
1430 | di->offset); | |
3d8eb7a9 SW |
1431 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
1432 | spin_lock(&mdsc->dentry_lru_lock); | |
1433 | list_move_tail(&di->lru, &mdsc->dentry_lru); | |
1434 | spin_unlock(&mdsc->dentry_lru_lock); | |
2817b000 SW |
1435 | } |
1436 | ||
1437 | void ceph_dentry_lru_del(struct dentry *dn) | |
1438 | { | |
1439 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1440 | struct ceph_mds_client *mdsc; | |
1441 | ||
a455589f | 1442 | dout("dentry_lru_del %p %p '%pd'\n", di, dn, dn); |
3d8eb7a9 SW |
1443 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
1444 | spin_lock(&mdsc->dentry_lru_lock); | |
1445 | list_del_init(&di->lru); | |
1446 | mdsc->num_dentry--; | |
1447 | spin_unlock(&mdsc->dentry_lru_lock); | |
2817b000 SW |
1448 | } |
1449 | ||
6c0f3af7 SW |
1450 | /* |
1451 | * Return name hash for a given dentry. This is dependent on | |
1452 | * the parent directory's hash function. | |
1453 | */ | |
e5f86dc3 | 1454 | unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn) |
6c0f3af7 | 1455 | { |
6c0f3af7 SW |
1456 | struct ceph_inode_info *dci = ceph_inode(dir); |
1457 | ||
1458 | switch (dci->i_dir_layout.dl_dir_hash) { | |
1459 | case 0: /* for backward compat */ | |
1460 | case CEPH_STR_HASH_LINUX: | |
1461 | return dn->d_name.hash; | |
1462 | ||
1463 | default: | |
1464 | return ceph_str_hash(dci->i_dir_layout.dl_dir_hash, | |
1465 | dn->d_name.name, dn->d_name.len); | |
1466 | } | |
1467 | } | |
1468 | ||
2817b000 SW |
1469 | const struct file_operations ceph_dir_fops = { |
1470 | .read = ceph_read_dir, | |
77acfa29 | 1471 | .iterate = ceph_readdir, |
2817b000 SW |
1472 | .llseek = ceph_dir_llseek, |
1473 | .open = ceph_open, | |
1474 | .release = ceph_release, | |
1475 | .unlocked_ioctl = ceph_ioctl, | |
da819c81 | 1476 | .fsync = ceph_fsync, |
2817b000 SW |
1477 | }; |
1478 | ||
38c48b5f YZ |
1479 | const struct file_operations ceph_snapdir_fops = { |
1480 | .iterate = ceph_readdir, | |
1481 | .llseek = ceph_dir_llseek, | |
1482 | .open = ceph_open, | |
1483 | .release = ceph_release, | |
1484 | }; | |
1485 | ||
2817b000 SW |
1486 | const struct inode_operations ceph_dir_iops = { |
1487 | .lookup = ceph_lookup, | |
1488 | .permission = ceph_permission, | |
1489 | .getattr = ceph_getattr, | |
1490 | .setattr = ceph_setattr, | |
2817b000 | 1491 | .listxattr = ceph_listxattr, |
7221fe4c | 1492 | .get_acl = ceph_get_acl, |
72466d0b | 1493 | .set_acl = ceph_set_acl, |
2817b000 SW |
1494 | .mknod = ceph_mknod, |
1495 | .symlink = ceph_symlink, | |
1496 | .mkdir = ceph_mkdir, | |
1497 | .link = ceph_link, | |
1498 | .unlink = ceph_unlink, | |
1499 | .rmdir = ceph_unlink, | |
1500 | .rename = ceph_rename, | |
1501 | .create = ceph_create, | |
2d83bde9 | 1502 | .atomic_open = ceph_atomic_open, |
2817b000 SW |
1503 | }; |
1504 | ||
38c48b5f YZ |
1505 | const struct inode_operations ceph_snapdir_iops = { |
1506 | .lookup = ceph_lookup, | |
1507 | .permission = ceph_permission, | |
1508 | .getattr = ceph_getattr, | |
1509 | .mkdir = ceph_mkdir, | |
1510 | .rmdir = ceph_unlink, | |
0ea611a3 | 1511 | .rename = ceph_rename, |
38c48b5f YZ |
1512 | }; |
1513 | ||
52dfb8ac | 1514 | const struct dentry_operations ceph_dentry_ops = { |
2817b000 | 1515 | .d_revalidate = ceph_d_revalidate, |
147851d2 | 1516 | .d_release = ceph_d_release, |
b58dc410 | 1517 | .d_prune = ceph_d_prune, |
ad5cb123 | 1518 | .d_init = ceph_d_init, |
2817b000 | 1519 | }; |