Commit | Line | Data |
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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> | |
2817b000 | 5 | #include <linux/namei.h> |
5a0e3ad6 | 6 | #include <linux/slab.h> |
2817b000 | 7 | #include <linux/sched.h> |
2cdeb1e4 | 8 | #include <linux/xattr.h> |
2817b000 SW |
9 | |
10 | #include "super.h" | |
3d14c5d2 | 11 | #include "mds_client.h" |
2817b000 SW |
12 | |
13 | /* | |
14 | * Directory operations: readdir, lookup, create, link, unlink, | |
15 | * rename, etc. | |
16 | */ | |
17 | ||
18 | /* | |
19 | * Ceph MDS operations are specified in terms of a base ino and | |
20 | * relative path. Thus, the client can specify an operation on a | |
21 | * specific inode (e.g., a getattr due to fstat(2)), or as a path | |
22 | * relative to, say, the root directory. | |
23 | * | |
24 | * Normally, we limit ourselves to strict inode ops (no path component) | |
25 | * or dentry operations (a single path component relative to an ino). The | |
26 | * exception to this is open_root_dentry(), which will open the mount | |
27 | * point by name. | |
28 | */ | |
29 | ||
52dfb8ac | 30 | const struct dentry_operations ceph_dentry_ops; |
2817b000 SW |
31 | |
32 | /* | |
33 | * Initialize ceph dentry state. | |
34 | */ | |
ad5cb123 | 35 | static int ceph_d_init(struct dentry *dentry) |
2817b000 SW |
36 | { |
37 | struct ceph_dentry_info *di; | |
38 | ||
99ec2697 | 39 | di = kmem_cache_zalloc(ceph_dentry_cachep, GFP_KERNEL); |
2817b000 SW |
40 | if (!di) |
41 | return -ENOMEM; /* oh well */ | |
42 | ||
2817b000 SW |
43 | di->dentry = dentry; |
44 | di->lease_session = NULL; | |
9b16f03c | 45 | di->time = jiffies; |
48d0cbd1 | 46 | dentry->d_fsdata = di; |
2817b000 | 47 | ceph_dentry_lru_add(dentry); |
2817b000 SW |
48 | return 0; |
49 | } | |
50 | ||
2817b000 | 51 | /* |
f3c4ebe6 YZ |
52 | * for f_pos for readdir: |
53 | * - hash order: | |
54 | * (0xff << 52) | ((24 bits hash) << 28) | | |
55 | * (the nth entry has hash collision); | |
56 | * - frag+name order; | |
57 | * ((frag value) << 28) | (the nth entry in frag); | |
2817b000 | 58 | */ |
f3c4ebe6 YZ |
59 | #define OFFSET_BITS 28 |
60 | #define OFFSET_MASK ((1 << OFFSET_BITS) - 1) | |
61 | #define HASH_ORDER (0xffull << (OFFSET_BITS + 24)) | |
62 | loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order) | |
63 | { | |
64 | loff_t fpos = ((loff_t)high << 28) | (loff_t)off; | |
65 | if (hash_order) | |
66 | fpos |= HASH_ORDER; | |
67 | return fpos; | |
68 | } | |
69 | ||
70 | static bool is_hash_order(loff_t p) | |
71 | { | |
72 | return (p & HASH_ORDER) == HASH_ORDER; | |
73 | } | |
74 | ||
2817b000 SW |
75 | static unsigned fpos_frag(loff_t p) |
76 | { | |
f3c4ebe6 | 77 | return p >> OFFSET_BITS; |
2817b000 | 78 | } |
f3c4ebe6 YZ |
79 | |
80 | static unsigned fpos_hash(loff_t p) | |
81 | { | |
82 | return ceph_frag_value(fpos_frag(p)); | |
83 | } | |
84 | ||
2817b000 SW |
85 | static unsigned fpos_off(loff_t p) |
86 | { | |
f3c4ebe6 | 87 | return p & OFFSET_MASK; |
2817b000 SW |
88 | } |
89 | ||
4d5f5df6 YZ |
90 | static int fpos_cmp(loff_t l, loff_t r) |
91 | { | |
92 | int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r)); | |
93 | if (v) | |
94 | return v; | |
95 | return (int)(fpos_off(l) - fpos_off(r)); | |
96 | } | |
97 | ||
fdd4e158 YZ |
98 | /* |
99 | * make note of the last dentry we read, so we can | |
100 | * continue at the same lexicographical point, | |
101 | * regardless of what dir changes take place on the | |
102 | * server. | |
103 | */ | |
bb48bd4d | 104 | static int note_last_dentry(struct ceph_dir_file_info *dfi, const char *name, |
fdd4e158 YZ |
105 | int len, unsigned next_offset) |
106 | { | |
107 | char *buf = kmalloc(len+1, GFP_KERNEL); | |
108 | if (!buf) | |
109 | return -ENOMEM; | |
bb48bd4d CX |
110 | kfree(dfi->last_name); |
111 | dfi->last_name = buf; | |
112 | memcpy(dfi->last_name, name, len); | |
113 | dfi->last_name[len] = 0; | |
114 | dfi->next_offset = next_offset; | |
115 | dout("note_last_dentry '%s'\n", dfi->last_name); | |
fdd4e158 YZ |
116 | return 0; |
117 | } | |
118 | ||
c530cd24 YZ |
119 | |
120 | static struct dentry * | |
121 | __dcache_find_get_entry(struct dentry *parent, u64 idx, | |
122 | struct ceph_readdir_cache_control *cache_ctl) | |
123 | { | |
124 | struct inode *dir = d_inode(parent); | |
125 | struct dentry *dentry; | |
126 | unsigned idx_mask = (PAGE_SIZE / sizeof(struct dentry *)) - 1; | |
127 | loff_t ptr_pos = idx * sizeof(struct dentry *); | |
128 | pgoff_t ptr_pgoff = ptr_pos >> PAGE_SHIFT; | |
129 | ||
130 | if (ptr_pos >= i_size_read(dir)) | |
131 | return NULL; | |
132 | ||
133 | if (!cache_ctl->page || ptr_pgoff != page_index(cache_ctl->page)) { | |
134 | ceph_readdir_cache_release(cache_ctl); | |
135 | cache_ctl->page = find_lock_page(&dir->i_data, ptr_pgoff); | |
136 | if (!cache_ctl->page) { | |
137 | dout(" page %lu not found\n", ptr_pgoff); | |
138 | return ERR_PTR(-EAGAIN); | |
139 | } | |
140 | /* reading/filling the cache are serialized by | |
141 | i_mutex, no need to use page lock */ | |
142 | unlock_page(cache_ctl->page); | |
143 | cache_ctl->dentries = kmap(cache_ctl->page); | |
144 | } | |
145 | ||
146 | cache_ctl->index = idx & idx_mask; | |
147 | ||
148 | rcu_read_lock(); | |
149 | spin_lock(&parent->d_lock); | |
150 | /* check i_size again here, because empty directory can be | |
151 | * marked as complete while not holding the i_mutex. */ | |
152 | if (ceph_dir_is_complete_ordered(dir) && ptr_pos < i_size_read(dir)) | |
153 | dentry = cache_ctl->dentries[cache_ctl->index]; | |
154 | else | |
155 | dentry = NULL; | |
156 | spin_unlock(&parent->d_lock); | |
157 | if (dentry && !lockref_get_not_dead(&dentry->d_lockref)) | |
158 | dentry = NULL; | |
159 | rcu_read_unlock(); | |
160 | return dentry ? : ERR_PTR(-EAGAIN); | |
161 | } | |
162 | ||
2817b000 SW |
163 | /* |
164 | * When possible, we try to satisfy a readdir by peeking at the | |
165 | * dcache. We make this work by carefully ordering dentries on | |
946e51f2 | 166 | * d_child when we initially get results back from the MDS, and |
2817b000 SW |
167 | * falling back to a "normal" sync readdir if any dentries in the dir |
168 | * are dropped. | |
169 | * | |
2f276c51 | 170 | * Complete dir indicates that we have all dentries in the dir. It is |
2817b000 SW |
171 | * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by |
172 | * the MDS if/when the directory is modified). | |
173 | */ | |
a30be7cb | 174 | static int __dcache_readdir(struct file *file, struct dir_context *ctx, |
97aeb6bf | 175 | int shared_gen) |
2817b000 | 176 | { |
bb48bd4d | 177 | struct ceph_dir_file_info *dfi = file->private_data; |
b583043e | 178 | struct dentry *parent = file->f_path.dentry; |
2b0143b5 | 179 | struct inode *dir = d_inode(parent); |
fdd4e158 | 180 | struct dentry *dentry, *last = NULL; |
2817b000 | 181 | struct ceph_dentry_info *di; |
fdd4e158 | 182 | struct ceph_readdir_cache_control cache_ctl = {}; |
c530cd24 YZ |
183 | u64 idx = 0; |
184 | int err = 0; | |
2817b000 | 185 | |
97aeb6bf | 186 | dout("__dcache_readdir %p v%u at %llx\n", dir, (unsigned)shared_gen, ctx->pos); |
2817b000 | 187 | |
c530cd24 YZ |
188 | /* search start position */ |
189 | if (ctx->pos > 2) { | |
190 | u64 count = div_u64(i_size_read(dir), sizeof(struct dentry *)); | |
191 | while (count > 0) { | |
192 | u64 step = count >> 1; | |
193 | dentry = __dcache_find_get_entry(parent, idx + step, | |
194 | &cache_ctl); | |
195 | if (!dentry) { | |
196 | /* use linar search */ | |
197 | idx = 0; | |
198 | break; | |
199 | } | |
200 | if (IS_ERR(dentry)) { | |
201 | err = PTR_ERR(dentry); | |
202 | goto out; | |
203 | } | |
204 | di = ceph_dentry(dentry); | |
205 | spin_lock(&dentry->d_lock); | |
206 | if (fpos_cmp(di->offset, ctx->pos) < 0) { | |
207 | idx += step + 1; | |
208 | count -= step + 1; | |
209 | } else { | |
210 | count = step; | |
211 | } | |
212 | spin_unlock(&dentry->d_lock); | |
213 | dput(dentry); | |
214 | } | |
2817b000 | 215 | |
c530cd24 | 216 | dout("__dcache_readdir %p cache idx %llu\n", dir, idx); |
2817b000 SW |
217 | } |
218 | ||
fdd4e158 | 219 | |
c530cd24 YZ |
220 | for (;;) { |
221 | bool emit_dentry = false; | |
222 | dentry = __dcache_find_get_entry(parent, idx++, &cache_ctl); | |
223 | if (!dentry) { | |
bb48bd4d | 224 | dfi->file_info.flags |= CEPH_F_ATEND; |
fdd4e158 YZ |
225 | err = 0; |
226 | break; | |
2817b000 | 227 | } |
c530cd24 YZ |
228 | if (IS_ERR(dentry)) { |
229 | err = PTR_ERR(dentry); | |
230 | goto out; | |
fdd4e158 YZ |
231 | } |
232 | ||
fdd4e158 | 233 | spin_lock(&dentry->d_lock); |
5495c2d0 YZ |
234 | di = ceph_dentry(dentry); |
235 | if (d_unhashed(dentry) || | |
236 | d_really_is_negative(dentry) || | |
237 | di->lease_shared_gen != shared_gen) { | |
238 | spin_unlock(&dentry->d_lock); | |
239 | dput(dentry); | |
240 | err = -EAGAIN; | |
241 | goto out; | |
242 | } | |
243 | if (fpos_cmp(ctx->pos, di->offset) <= 0) { | |
fdd4e158 YZ |
244 | emit_dentry = true; |
245 | } | |
da502956 | 246 | spin_unlock(&dentry->d_lock); |
2817b000 | 247 | |
fdd4e158 | 248 | if (emit_dentry) { |
f3c4ebe6 | 249 | dout(" %llx dentry %p %pd %p\n", di->offset, |
fdd4e158 YZ |
250 | dentry, dentry, d_inode(dentry)); |
251 | ctx->pos = di->offset; | |
252 | if (!dir_emit(ctx, dentry->d_name.name, | |
253 | dentry->d_name.len, | |
254 | ceph_translate_ino(dentry->d_sb, | |
255 | d_inode(dentry)->i_ino), | |
256 | d_inode(dentry)->i_mode >> 12)) { | |
257 | dput(dentry); | |
258 | err = 0; | |
259 | break; | |
260 | } | |
261 | ctx->pos++; | |
0081bd83 | 262 | |
fdd4e158 YZ |
263 | if (last) |
264 | dput(last); | |
265 | last = dentry; | |
266 | } else { | |
267 | dput(dentry); | |
2817b000 | 268 | } |
fdd4e158 | 269 | } |
c530cd24 | 270 | out: |
fdd4e158 YZ |
271 | ceph_readdir_cache_release(&cache_ctl); |
272 | if (last) { | |
273 | int ret; | |
274 | di = ceph_dentry(last); | |
bb48bd4d | 275 | ret = note_last_dentry(dfi, last->d_name.name, last->d_name.len, |
fdd4e158 YZ |
276 | fpos_off(di->offset) + 1); |
277 | if (ret < 0) | |
278 | err = ret; | |
2817b000 | 279 | dput(last); |
84583cfb | 280 | /* last_name no longer match cache index */ |
bb48bd4d CX |
281 | if (dfi->readdir_cache_idx >= 0) { |
282 | dfi->readdir_cache_idx = -1; | |
283 | dfi->dir_release_count = 0; | |
84583cfb | 284 | } |
fdd4e158 | 285 | } |
2817b000 SW |
286 | return err; |
287 | } | |
288 | ||
bb48bd4d | 289 | static bool need_send_readdir(struct ceph_dir_file_info *dfi, loff_t pos) |
f3c4ebe6 | 290 | { |
bb48bd4d | 291 | if (!dfi->last_readdir) |
f3c4ebe6 YZ |
292 | return true; |
293 | if (is_hash_order(pos)) | |
bb48bd4d | 294 | return !ceph_frag_contains_value(dfi->frag, fpos_hash(pos)); |
f3c4ebe6 | 295 | else |
bb48bd4d | 296 | return dfi->frag != fpos_frag(pos); |
f3c4ebe6 YZ |
297 | } |
298 | ||
77acfa29 | 299 | static int ceph_readdir(struct file *file, struct dir_context *ctx) |
2817b000 | 300 | { |
bb48bd4d | 301 | struct ceph_dir_file_info *dfi = file->private_data; |
77acfa29 | 302 | struct inode *inode = file_inode(file); |
2817b000 | 303 | struct ceph_inode_info *ci = ceph_inode(inode); |
3d14c5d2 YS |
304 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
305 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
8974eebd | 306 | int i; |
2817b000 | 307 | int err; |
b50c2de5 | 308 | unsigned frag = -1; |
2817b000 | 309 | struct ceph_mds_reply_info_parsed *rinfo; |
2817b000 | 310 | |
8974eebd | 311 | dout("readdir %p file %p pos %llx\n", inode, file, ctx->pos); |
bb48bd4d | 312 | if (dfi->file_info.flags & CEPH_F_ATEND) |
2817b000 SW |
313 | return 0; |
314 | ||
315 | /* always start with . and .. */ | |
77acfa29 | 316 | if (ctx->pos == 0) { |
2817b000 | 317 | dout("readdir off 0 -> '.'\n"); |
77acfa29 | 318 | if (!dir_emit(ctx, ".", 1, |
ad1fee96 | 319 | ceph_translate_ino(inode->i_sb, inode->i_ino), |
77acfa29 | 320 | inode->i_mode >> 12)) |
2817b000 | 321 | return 0; |
77acfa29 | 322 | ctx->pos = 1; |
2817b000 | 323 | } |
77acfa29 | 324 | if (ctx->pos == 1) { |
b583043e | 325 | ino_t ino = parent_ino(file->f_path.dentry); |
2817b000 | 326 | dout("readdir off 1 -> '..'\n"); |
77acfa29 | 327 | if (!dir_emit(ctx, "..", 2, |
ad1fee96 | 328 | ceph_translate_ino(inode->i_sb, ino), |
77acfa29 | 329 | inode->i_mode >> 12)) |
2817b000 | 330 | return 0; |
77acfa29 | 331 | ctx->pos = 2; |
2817b000 SW |
332 | } |
333 | ||
334 | /* can we use the dcache? */ | |
be655596 | 335 | spin_lock(&ci->i_ceph_lock); |
fdd4e158 | 336 | if (ceph_test_mount_opt(fsc, DCACHE) && |
3d14c5d2 | 337 | !ceph_test_mount_opt(fsc, NOASYNCREADDIR) && |
a0dff78d | 338 | ceph_snap(inode) != CEPH_SNAPDIR && |
70db4f36 | 339 | __ceph_dir_is_complete_ordered(ci) && |
2817b000 | 340 | __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) { |
97aeb6bf | 341 | int shared_gen = atomic_read(&ci->i_shared_gen); |
be655596 | 342 | spin_unlock(&ci->i_ceph_lock); |
a30be7cb | 343 | err = __dcache_readdir(file, ctx, shared_gen); |
efa4c120 | 344 | if (err != -EAGAIN) |
2817b000 | 345 | return err; |
efa4c120 | 346 | } else { |
be655596 | 347 | spin_unlock(&ci->i_ceph_lock); |
2817b000 | 348 | } |
2817b000 SW |
349 | |
350 | /* proceed with a normal readdir */ | |
2817b000 SW |
351 | more: |
352 | /* do we have the correct frag content buffered? */ | |
bb48bd4d | 353 | if (need_send_readdir(dfi, ctx->pos)) { |
2817b000 SW |
354 | struct ceph_mds_request *req; |
355 | int op = ceph_snap(inode) == CEPH_SNAPDIR ? | |
356 | CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR; | |
357 | ||
358 | /* discard old result, if any */ | |
bb48bd4d CX |
359 | if (dfi->last_readdir) { |
360 | ceph_mdsc_put_request(dfi->last_readdir); | |
361 | dfi->last_readdir = NULL; | |
393f6620 | 362 | } |
2817b000 | 363 | |
f3c4ebe6 | 364 | if (is_hash_order(ctx->pos)) { |
b50c2de5 YZ |
365 | /* fragtree isn't always accurate. choose frag |
366 | * based on previous reply when possible. */ | |
367 | if (frag == (unsigned)-1) | |
368 | frag = ceph_choose_frag(ci, fpos_hash(ctx->pos), | |
369 | NULL, NULL); | |
f3c4ebe6 YZ |
370 | } else { |
371 | frag = fpos_frag(ctx->pos); | |
372 | } | |
373 | ||
2817b000 | 374 | dout("readdir fetching %llx.%llx frag %x offset '%s'\n", |
bb48bd4d | 375 | ceph_vinop(inode), frag, dfi->last_name); |
2817b000 SW |
376 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); |
377 | if (IS_ERR(req)) | |
378 | return PTR_ERR(req); | |
54008399 YZ |
379 | err = ceph_alloc_readdir_reply_buffer(req, inode); |
380 | if (err) { | |
381 | ceph_mdsc_put_request(req); | |
382 | return err; | |
383 | } | |
2817b000 SW |
384 | /* hints to request -> mds selection code */ |
385 | req->r_direct_mode = USE_AUTH_MDS; | |
5d37ca14 YZ |
386 | if (op == CEPH_MDS_OP_READDIR) { |
387 | req->r_direct_hash = ceph_frag_value(frag); | |
388 | __set_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags); | |
87c91a96 | 389 | req->r_inode_drop = CEPH_CAP_FILE_EXCL; |
5d37ca14 | 390 | } |
bb48bd4d CX |
391 | if (dfi->last_name) { |
392 | req->r_path2 = kstrdup(dfi->last_name, GFP_KERNEL); | |
a149bb9a SK |
393 | if (!req->r_path2) { |
394 | ceph_mdsc_put_request(req); | |
395 | return -ENOMEM; | |
396 | } | |
79162547 YZ |
397 | } else if (is_hash_order(ctx->pos)) { |
398 | req->r_args.readdir.offset_hash = | |
399 | cpu_to_le32(fpos_hash(ctx->pos)); | |
a149bb9a | 400 | } |
79162547 | 401 | |
bb48bd4d CX |
402 | req->r_dir_release_cnt = dfi->dir_release_count; |
403 | req->r_dir_ordered_cnt = dfi->dir_ordered_count; | |
404 | req->r_readdir_cache_idx = dfi->readdir_cache_idx; | |
405 | req->r_readdir_offset = dfi->next_offset; | |
2817b000 | 406 | req->r_args.readdir.frag = cpu_to_le32(frag); |
956d39d6 YZ |
407 | req->r_args.readdir.flags = |
408 | cpu_to_le16(CEPH_READDIR_REPLY_BITFLAGS); | |
a149bb9a SK |
409 | |
410 | req->r_inode = inode; | |
411 | ihold(inode); | |
412 | req->r_dentry = dget(file->f_path.dentry); | |
2817b000 SW |
413 | err = ceph_mdsc_do_request(mdsc, NULL, req); |
414 | if (err < 0) { | |
415 | ceph_mdsc_put_request(req); | |
416 | return err; | |
417 | } | |
f3c4ebe6 YZ |
418 | dout("readdir got and parsed readdir result=%d on " |
419 | "frag %x, end=%d, complete=%d, hash_order=%d\n", | |
420 | err, frag, | |
2817b000 | 421 | (int)req->r_reply_info.dir_end, |
f3c4ebe6 YZ |
422 | (int)req->r_reply_info.dir_complete, |
423 | (int)req->r_reply_info.hash_order); | |
2817b000 | 424 | |
81c6aea5 YZ |
425 | rinfo = &req->r_reply_info; |
426 | if (le32_to_cpu(rinfo->dir_dir->frag) != frag) { | |
427 | frag = le32_to_cpu(rinfo->dir_dir->frag); | |
f3c4ebe6 | 428 | if (!rinfo->hash_order) { |
bb48bd4d | 429 | dfi->next_offset = req->r_readdir_offset; |
f3c4ebe6 YZ |
430 | /* adjust ctx->pos to beginning of frag */ |
431 | ctx->pos = ceph_make_fpos(frag, | |
bb48bd4d | 432 | dfi->next_offset, |
f3c4ebe6 YZ |
433 | false); |
434 | } | |
81c6aea5 | 435 | } |
fdd4e158 | 436 | |
bb48bd4d CX |
437 | dfi->frag = frag; |
438 | dfi->last_readdir = req; | |
2817b000 | 439 | |
bc2de10d | 440 | if (test_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags)) { |
bb48bd4d CX |
441 | dfi->readdir_cache_idx = req->r_readdir_cache_idx; |
442 | if (dfi->readdir_cache_idx < 0) { | |
fdd4e158 | 443 | /* preclude from marking dir ordered */ |
bb48bd4d | 444 | dfi->dir_ordered_count = 0; |
8974eebd | 445 | } else if (ceph_frag_is_leftmost(frag) && |
bb48bd4d | 446 | dfi->next_offset == 2) { |
fdd4e158 YZ |
447 | /* note dir version at start of readdir so |
448 | * we can tell if any dentries get dropped */ | |
bb48bd4d CX |
449 | dfi->dir_release_count = req->r_dir_release_cnt; |
450 | dfi->dir_ordered_count = req->r_dir_ordered_cnt; | |
fdd4e158 YZ |
451 | } |
452 | } else { | |
4c069a58 | 453 | dout("readdir !did_prepopulate\n"); |
fdd4e158 | 454 | /* disable readdir cache */ |
bb48bd4d | 455 | dfi->readdir_cache_idx = -1; |
fdd4e158 | 456 | /* preclude from marking dir complete */ |
bb48bd4d | 457 | dfi->dir_release_count = 0; |
fdd4e158 YZ |
458 | } |
459 | ||
f3c4ebe6 YZ |
460 | /* note next offset and last dentry name */ |
461 | if (rinfo->dir_nr > 0) { | |
2a5beea3 YZ |
462 | struct ceph_mds_reply_dir_entry *rde = |
463 | rinfo->dir_entries + (rinfo->dir_nr-1); | |
f3c4ebe6 YZ |
464 | unsigned next_offset = req->r_reply_info.dir_end ? |
465 | 2 : (fpos_off(rde->offset) + 1); | |
bb48bd4d | 466 | err = note_last_dentry(dfi, rde->name, rde->name_len, |
f3c4ebe6 | 467 | next_offset); |
2817b000 SW |
468 | if (err) |
469 | return err; | |
f3c4ebe6 | 470 | } else if (req->r_reply_info.dir_end) { |
bb48bd4d | 471 | dfi->next_offset = 2; |
f3c4ebe6 | 472 | /* keep last name */ |
2817b000 SW |
473 | } |
474 | } | |
475 | ||
bb48bd4d | 476 | rinfo = &dfi->last_readdir->r_reply_info; |
8974eebd | 477 | dout("readdir frag %x num %d pos %llx chunk first %llx\n", |
bb48bd4d | 478 | dfi->frag, rinfo->dir_nr, ctx->pos, |
8974eebd | 479 | rinfo->dir_nr ? rinfo->dir_entries[0].offset : 0LL); |
77acfa29 | 480 | |
8974eebd YZ |
481 | i = 0; |
482 | /* search start position */ | |
483 | if (rinfo->dir_nr > 0) { | |
484 | int step, nr = rinfo->dir_nr; | |
485 | while (nr > 0) { | |
486 | step = nr >> 1; | |
487 | if (rinfo->dir_entries[i + step].offset < ctx->pos) { | |
488 | i += step + 1; | |
489 | nr -= step + 1; | |
490 | } else { | |
491 | nr = step; | |
492 | } | |
493 | } | |
494 | } | |
495 | for (; i < rinfo->dir_nr; i++) { | |
496 | struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i; | |
3105c19c SW |
497 | struct ceph_vino vino; |
498 | ino_t ino; | |
b50c2de5 | 499 | u32 ftype; |
3105c19c | 500 | |
8974eebd YZ |
501 | BUG_ON(rde->offset < ctx->pos); |
502 | ||
503 | ctx->pos = rde->offset; | |
504 | dout("readdir (%d/%d) -> %llx '%.*s' %p\n", | |
505 | i, rinfo->dir_nr, ctx->pos, | |
2a5beea3 | 506 | rde->name_len, rde->name, &rde->inode.in); |
8974eebd | 507 | |
2a5beea3 YZ |
508 | BUG_ON(!rde->inode.in); |
509 | ftype = le32_to_cpu(rde->inode.in->mode) >> 12; | |
510 | vino.ino = le64_to_cpu(rde->inode.in->ino); | |
511 | vino.snap = le64_to_cpu(rde->inode.in->snapid); | |
3105c19c | 512 | ino = ceph_vino_to_ino(vino); |
8974eebd | 513 | |
2a5beea3 YZ |
514 | if (!dir_emit(ctx, rde->name, rde->name_len, |
515 | ceph_translate_ino(inode->i_sb, ino), ftype)) { | |
2817b000 SW |
516 | dout("filldir stopping us...\n"); |
517 | return 0; | |
518 | } | |
77acfa29 | 519 | ctx->pos++; |
2817b000 SW |
520 | } |
521 | ||
bb48bd4d CX |
522 | ceph_mdsc_put_request(dfi->last_readdir); |
523 | dfi->last_readdir = NULL; | |
b50c2de5 | 524 | |
bb48bd4d CX |
525 | if (dfi->next_offset > 2) { |
526 | frag = dfi->frag; | |
2817b000 SW |
527 | goto more; |
528 | } | |
529 | ||
530 | /* more frags? */ | |
bb48bd4d CX |
531 | if (!ceph_frag_is_rightmost(dfi->frag)) { |
532 | frag = ceph_frag_next(dfi->frag); | |
f3c4ebe6 YZ |
533 | if (is_hash_order(ctx->pos)) { |
534 | loff_t new_pos = ceph_make_fpos(ceph_frag_value(frag), | |
bb48bd4d | 535 | dfi->next_offset, true); |
f3c4ebe6 YZ |
536 | if (new_pos > ctx->pos) |
537 | ctx->pos = new_pos; | |
538 | /* keep last_name */ | |
539 | } else { | |
bb48bd4d CX |
540 | ctx->pos = ceph_make_fpos(frag, dfi->next_offset, |
541 | false); | |
542 | kfree(dfi->last_name); | |
543 | dfi->last_name = NULL; | |
f3c4ebe6 | 544 | } |
2817b000 SW |
545 | dout("readdir next frag is %x\n", frag); |
546 | goto more; | |
547 | } | |
bb48bd4d | 548 | dfi->file_info.flags |= CEPH_F_ATEND; |
2817b000 SW |
549 | |
550 | /* | |
551 | * if dir_release_count still matches the dir, no dentries | |
552 | * were released during the whole readdir, and we should have | |
553 | * the complete dir contents in our cache. | |
554 | */ | |
bb48bd4d CX |
555 | if (atomic64_read(&ci->i_release_count) == |
556 | dfi->dir_release_count) { | |
fdd4e158 | 557 | spin_lock(&ci->i_ceph_lock); |
bb48bd4d CX |
558 | if (dfi->dir_ordered_count == |
559 | atomic64_read(&ci->i_ordered_count)) { | |
70db4f36 | 560 | dout(" marking %p complete and ordered\n", inode); |
fdd4e158 YZ |
561 | /* use i_size to track number of entries in |
562 | * readdir cache */ | |
bb48bd4d CX |
563 | BUG_ON(dfi->readdir_cache_idx < 0); |
564 | i_size_write(inode, dfi->readdir_cache_idx * | |
fdd4e158 YZ |
565 | sizeof(struct dentry*)); |
566 | } else { | |
70db4f36 | 567 | dout(" marking %p complete\n", inode); |
fdd4e158 | 568 | } |
bb48bd4d CX |
569 | __ceph_dir_set_complete(ci, dfi->dir_release_count, |
570 | dfi->dir_ordered_count); | |
fdd4e158 | 571 | spin_unlock(&ci->i_ceph_lock); |
2817b000 | 572 | } |
2817b000 | 573 | |
77acfa29 | 574 | dout("readdir %p file %p done.\n", inode, file); |
2817b000 SW |
575 | return 0; |
576 | } | |
577 | ||
bb48bd4d | 578 | static void reset_readdir(struct ceph_dir_file_info *dfi) |
2817b000 | 579 | { |
bb48bd4d CX |
580 | if (dfi->last_readdir) { |
581 | ceph_mdsc_put_request(dfi->last_readdir); | |
582 | dfi->last_readdir = NULL; | |
2817b000 | 583 | } |
bb48bd4d CX |
584 | kfree(dfi->last_name); |
585 | dfi->last_name = NULL; | |
586 | dfi->dir_release_count = 0; | |
587 | dfi->readdir_cache_idx = -1; | |
588 | dfi->next_offset = 2; /* compensate for . and .. */ | |
589 | dfi->file_info.flags &= ~CEPH_F_ATEND; | |
2817b000 SW |
590 | } |
591 | ||
8974eebd YZ |
592 | /* |
593 | * discard buffered readdir content on seekdir(0), or seek to new frag, | |
594 | * or seek prior to current chunk | |
595 | */ | |
bb48bd4d | 596 | static bool need_reset_readdir(struct ceph_dir_file_info *dfi, loff_t new_pos) |
8974eebd YZ |
597 | { |
598 | struct ceph_mds_reply_info_parsed *rinfo; | |
f3c4ebe6 | 599 | loff_t chunk_offset; |
8974eebd YZ |
600 | if (new_pos == 0) |
601 | return true; | |
f3c4ebe6 YZ |
602 | if (is_hash_order(new_pos)) { |
603 | /* no need to reset last_name for a forward seek when | |
604 | * dentries are sotred in hash order */ | |
bb48bd4d | 605 | } else if (dfi->frag != fpos_frag(new_pos)) { |
8974eebd | 606 | return true; |
f3c4ebe6 | 607 | } |
bb48bd4d | 608 | rinfo = dfi->last_readdir ? &dfi->last_readdir->r_reply_info : NULL; |
8974eebd YZ |
609 | if (!rinfo || !rinfo->dir_nr) |
610 | return true; | |
f3c4ebe6 YZ |
611 | chunk_offset = rinfo->dir_entries[0].offset; |
612 | return new_pos < chunk_offset || | |
613 | is_hash_order(new_pos) != is_hash_order(chunk_offset); | |
8974eebd YZ |
614 | } |
615 | ||
965c8e59 | 616 | static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence) |
2817b000 | 617 | { |
bb48bd4d | 618 | struct ceph_dir_file_info *dfi = file->private_data; |
2817b000 | 619 | struct inode *inode = file->f_mapping->host; |
2817b000 SW |
620 | loff_t retval; |
621 | ||
5955102c | 622 | inode_lock(inode); |
06222e49 | 623 | retval = -EINVAL; |
965c8e59 | 624 | switch (whence) { |
2817b000 SW |
625 | case SEEK_CUR: |
626 | offset += file->f_pos; | |
06222e49 JB |
627 | case SEEK_SET: |
628 | break; | |
fdd4e158 YZ |
629 | case SEEK_END: |
630 | retval = -EOPNOTSUPP; | |
06222e49 JB |
631 | default: |
632 | goto out; | |
2817b000 | 633 | } |
06222e49 | 634 | |
f0494206 | 635 | if (offset >= 0) { |
bb48bd4d | 636 | if (need_reset_readdir(dfi, offset)) { |
f3c4ebe6 | 637 | dout("dir_llseek dropping %p content\n", file); |
bb48bd4d | 638 | reset_readdir(dfi); |
f3c4ebe6 YZ |
639 | } else if (is_hash_order(offset) && offset > file->f_pos) { |
640 | /* for hash offset, we don't know if a forward seek | |
641 | * is within same frag */ | |
bb48bd4d CX |
642 | dfi->dir_release_count = 0; |
643 | dfi->readdir_cache_idx = -1; | |
f3c4ebe6 YZ |
644 | } |
645 | ||
2817b000 SW |
646 | if (offset != file->f_pos) { |
647 | file->f_pos = offset; | |
648 | file->f_version = 0; | |
bb48bd4d | 649 | dfi->file_info.flags &= ~CEPH_F_ATEND; |
2817b000 SW |
650 | } |
651 | retval = offset; | |
2817b000 | 652 | } |
06222e49 | 653 | out: |
5955102c | 654 | inode_unlock(inode); |
2817b000 SW |
655 | return retval; |
656 | } | |
657 | ||
658 | /* | |
468640e3 | 659 | * Handle lookups for the hidden .snap directory. |
2817b000 | 660 | */ |
468640e3 SW |
661 | int ceph_handle_snapdir(struct ceph_mds_request *req, |
662 | struct dentry *dentry, int err) | |
2817b000 | 663 | { |
3d14c5d2 | 664 | struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); |
2b0143b5 | 665 | struct inode *parent = d_inode(dentry->d_parent); /* we hold i_mutex */ |
2817b000 SW |
666 | |
667 | /* .snap dir? */ | |
668 | if (err == -ENOENT && | |
455cec0a | 669 | ceph_snap(parent) == CEPH_NOSNAP && |
6b805185 | 670 | strcmp(dentry->d_name.name, |
3d14c5d2 | 671 | fsc->mount_options->snapdir_name) == 0) { |
2817b000 | 672 | struct inode *inode = ceph_get_snapdir(parent); |
a455589f AV |
673 | dout("ENOENT on snapdir %p '%pd', linking to snapdir %p\n", |
674 | dentry, dentry, inode); | |
9358c6d4 | 675 | BUG_ON(!d_unhashed(dentry)); |
2817b000 SW |
676 | d_add(dentry, inode); |
677 | err = 0; | |
678 | } | |
468640e3 SW |
679 | return err; |
680 | } | |
2817b000 | 681 | |
468640e3 SW |
682 | /* |
683 | * Figure out final result of a lookup/open request. | |
684 | * | |
685 | * Mainly, make sure we return the final req->r_dentry (if it already | |
686 | * existed) in place of the original VFS-provided dentry when they | |
687 | * differ. | |
688 | * | |
689 | * Gracefully handle the case where the MDS replies with -ENOENT and | |
690 | * no trace (which it may do, at its discretion, e.g., if it doesn't | |
691 | * care to issue a lease on the negative dentry). | |
692 | */ | |
693 | struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, | |
694 | struct dentry *dentry, int err) | |
695 | { | |
2817b000 SW |
696 | if (err == -ENOENT) { |
697 | /* no trace? */ | |
698 | err = 0; | |
699 | if (!req->r_reply_info.head->is_dentry) { | |
700 | dout("ENOENT and no trace, dentry %p inode %p\n", | |
2b0143b5 DH |
701 | dentry, d_inode(dentry)); |
702 | if (d_really_is_positive(dentry)) { | |
2817b000 SW |
703 | d_drop(dentry); |
704 | err = -ENOENT; | |
705 | } else { | |
706 | d_add(dentry, NULL); | |
707 | } | |
708 | } | |
709 | } | |
710 | if (err) | |
711 | dentry = ERR_PTR(err); | |
712 | else if (dentry != req->r_dentry) | |
713 | dentry = dget(req->r_dentry); /* we got spliced */ | |
714 | else | |
715 | dentry = NULL; | |
716 | return dentry; | |
717 | } | |
718 | ||
3b33f692 | 719 | static bool is_root_ceph_dentry(struct inode *inode, struct dentry *dentry) |
1d1de916 SW |
720 | { |
721 | return ceph_ino(inode) == CEPH_INO_ROOT && | |
722 | strncmp(dentry->d_name.name, ".ceph", 5) == 0; | |
723 | } | |
724 | ||
2817b000 SW |
725 | /* |
726 | * Look up a single dir entry. If there is a lookup intent, inform | |
727 | * the MDS so that it gets our 'caps wanted' value in a single op. | |
728 | */ | |
729 | static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry, | |
00cd8dd3 | 730 | unsigned int flags) |
2817b000 | 731 | { |
3d14c5d2 YS |
732 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
733 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
734 | struct ceph_mds_request *req; |
735 | int op; | |
315f2408 | 736 | int mask; |
2817b000 SW |
737 | int err; |
738 | ||
a455589f AV |
739 | dout("lookup %p dentry %p '%pd'\n", |
740 | dir, dentry, dentry); | |
2817b000 SW |
741 | |
742 | if (dentry->d_name.len > NAME_MAX) | |
743 | return ERR_PTR(-ENAMETOOLONG); | |
744 | ||
2817b000 | 745 | /* can we conclude ENOENT locally? */ |
2b0143b5 | 746 | if (d_really_is_negative(dentry)) { |
2817b000 SW |
747 | struct ceph_inode_info *ci = ceph_inode(dir); |
748 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
749 | ||
be655596 | 750 | spin_lock(&ci->i_ceph_lock); |
2817b000 SW |
751 | dout(" dir %p flags are %d\n", dir, ci->i_ceph_flags); |
752 | if (strncmp(dentry->d_name.name, | |
3d14c5d2 | 753 | fsc->mount_options->snapdir_name, |
2817b000 | 754 | dentry->d_name.len) && |
1d1de916 | 755 | !is_root_ceph_dentry(dir, dentry) && |
e2c3de04 | 756 | ceph_test_mount_opt(fsc, DCACHE) && |
2f276c51 | 757 | __ceph_dir_is_complete(ci) && |
2817b000 | 758 | (__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) { |
be655596 | 759 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
760 | dout(" dir %p complete, -ENOENT\n", dir); |
761 | d_add(dentry, NULL); | |
97aeb6bf | 762 | di->lease_shared_gen = atomic_read(&ci->i_shared_gen); |
2817b000 SW |
763 | return NULL; |
764 | } | |
be655596 | 765 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
766 | } |
767 | ||
768 | op = ceph_snap(dir) == CEPH_SNAPDIR ? | |
769 | CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; | |
770 | req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); | |
771 | if (IS_ERR(req)) | |
7e34bc52 | 772 | return ERR_CAST(req); |
2817b000 SW |
773 | req->r_dentry = dget(dentry); |
774 | req->r_num_caps = 2; | |
315f2408 YZ |
775 | |
776 | mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED; | |
777 | if (ceph_security_xattr_wanted(dir)) | |
778 | mask |= CEPH_CAP_XATTR_SHARED; | |
779 | req->r_args.getattr.mask = cpu_to_le32(mask); | |
780 | ||
3dd69aab JL |
781 | req->r_parent = dir; |
782 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); | |
2817b000 | 783 | err = ceph_mdsc_do_request(mdsc, NULL, req); |
468640e3 | 784 | err = ceph_handle_snapdir(req, dentry, err); |
2817b000 SW |
785 | dentry = ceph_finish_lookup(req, dentry, err); |
786 | ceph_mdsc_put_request(req); /* will dput(dentry) */ | |
787 | dout("lookup result=%p\n", dentry); | |
788 | return dentry; | |
789 | } | |
790 | ||
791 | /* | |
792 | * If we do a create but get no trace back from the MDS, follow up with | |
793 | * a lookup (the VFS expects us to link up the provided dentry). | |
794 | */ | |
795 | int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry) | |
796 | { | |
00cd8dd3 | 797 | struct dentry *result = ceph_lookup(dir, dentry, 0); |
2817b000 SW |
798 | |
799 | if (result && !IS_ERR(result)) { | |
800 | /* | |
801 | * We created the item, then did a lookup, and found | |
802 | * it was already linked to another inode we already | |
4d41cef2 YZ |
803 | * had in our cache (and thus got spliced). To not |
804 | * confuse VFS (especially when inode is a directory), | |
805 | * we don't link our dentry to that inode, return an | |
806 | * error instead. | |
807 | * | |
808 | * This event should be rare and it happens only when | |
809 | * we talk to old MDS. Recent MDS does not send traceless | |
810 | * reply for request that creates new inode. | |
2817b000 | 811 | */ |
5cba372c | 812 | d_drop(result); |
4d41cef2 | 813 | return -ESTALE; |
2817b000 SW |
814 | } |
815 | return PTR_ERR(result); | |
816 | } | |
817 | ||
818 | static int ceph_mknod(struct inode *dir, struct dentry *dentry, | |
1a67aafb | 819 | umode_t mode, dev_t rdev) |
2817b000 | 820 | { |
3d14c5d2 YS |
821 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
822 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 | 823 | struct ceph_mds_request *req; |
b1ee94aa | 824 | struct ceph_acls_info acls = {}; |
2817b000 SW |
825 | int err; |
826 | ||
827 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
828 | return -EROFS; | |
829 | ||
b7a29217 LH |
830 | if (ceph_quota_is_max_files_exceeded(dir)) |
831 | return -EDQUOT; | |
832 | ||
b1ee94aa YZ |
833 | err = ceph_pre_init_acls(dir, &mode, &acls); |
834 | if (err < 0) | |
835 | return err; | |
836 | ||
1a67aafb | 837 | dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n", |
2817b000 SW |
838 | dir, dentry, mode, rdev); |
839 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS); | |
840 | if (IS_ERR(req)) { | |
b1ee94aa YZ |
841 | err = PTR_ERR(req); |
842 | goto out; | |
2817b000 SW |
843 | } |
844 | req->r_dentry = dget(dentry); | |
845 | req->r_num_caps = 2; | |
3dd69aab JL |
846 | req->r_parent = dir; |
847 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); | |
2817b000 SW |
848 | req->r_args.mknod.mode = cpu_to_le32(mode); |
849 | req->r_args.mknod.rdev = cpu_to_le32(rdev); | |
222b7f90 | 850 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL; |
2817b000 | 851 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
b1ee94aa YZ |
852 | if (acls.pagelist) { |
853 | req->r_pagelist = acls.pagelist; | |
854 | acls.pagelist = NULL; | |
855 | } | |
2817b000 SW |
856 | err = ceph_mdsc_do_request(mdsc, dir, req); |
857 | if (!err && !req->r_reply_info.head->is_dentry) | |
858 | err = ceph_handle_notrace_create(dir, dentry); | |
859 | ceph_mdsc_put_request(req); | |
b1ee94aa | 860 | out: |
7221fe4c | 861 | if (!err) |
2b0143b5 | 862 | ceph_init_inode_acls(d_inode(dentry), &acls); |
b20a95a0 | 863 | else |
2817b000 | 864 | d_drop(dentry); |
b1ee94aa | 865 | ceph_release_acls_info(&acls); |
2817b000 SW |
866 | return err; |
867 | } | |
868 | ||
4acdaf27 | 869 | static int ceph_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 870 | bool excl) |
2817b000 | 871 | { |
2d83bde9 | 872 | return ceph_mknod(dir, dentry, mode, 0); |
2817b000 SW |
873 | } |
874 | ||
875 | static int ceph_symlink(struct inode *dir, struct dentry *dentry, | |
876 | const char *dest) | |
877 | { | |
3d14c5d2 YS |
878 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
879 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
880 | struct ceph_mds_request *req; |
881 | int err; | |
882 | ||
883 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
884 | return -EROFS; | |
885 | ||
b7a29217 LH |
886 | if (ceph_quota_is_max_files_exceeded(dir)) |
887 | return -EDQUOT; | |
888 | ||
2817b000 SW |
889 | dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest); |
890 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS); | |
891 | if (IS_ERR(req)) { | |
b1ee94aa YZ |
892 | err = PTR_ERR(req); |
893 | goto out; | |
2817b000 | 894 | } |
687265e5 | 895 | req->r_path2 = kstrdup(dest, GFP_KERNEL); |
a149bb9a SK |
896 | if (!req->r_path2) { |
897 | err = -ENOMEM; | |
898 | ceph_mdsc_put_request(req); | |
899 | goto out; | |
900 | } | |
3dd69aab JL |
901 | req->r_parent = dir; |
902 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); | |
a149bb9a SK |
903 | req->r_dentry = dget(dentry); |
904 | req->r_num_caps = 2; | |
222b7f90 | 905 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL; |
2817b000 SW |
906 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
907 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
908 | if (!err && !req->r_reply_info.head->is_dentry) | |
909 | err = ceph_handle_notrace_create(dir, dentry); | |
910 | ceph_mdsc_put_request(req); | |
b1ee94aa YZ |
911 | out: |
912 | if (err) | |
2817b000 SW |
913 | d_drop(dentry); |
914 | return err; | |
915 | } | |
916 | ||
18bb1db3 | 917 | static int ceph_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
2817b000 | 918 | { |
3d14c5d2 YS |
919 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
920 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 | 921 | struct ceph_mds_request *req; |
b1ee94aa | 922 | struct ceph_acls_info acls = {}; |
2817b000 SW |
923 | int err = -EROFS; |
924 | int op; | |
925 | ||
926 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
927 | /* mkdir .snap/foo is a MKSNAP */ | |
928 | op = CEPH_MDS_OP_MKSNAP; | |
a455589f AV |
929 | dout("mksnap dir %p snap '%pd' dn %p\n", dir, |
930 | dentry, dentry); | |
2817b000 | 931 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { |
18bb1db3 | 932 | dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode); |
2817b000 SW |
933 | op = CEPH_MDS_OP_MKDIR; |
934 | } else { | |
935 | goto out; | |
936 | } | |
b1ee94aa | 937 | |
25963669 YZ |
938 | if (op == CEPH_MDS_OP_MKDIR && |
939 | ceph_quota_is_max_files_exceeded(dir)) { | |
b7a29217 LH |
940 | err = -EDQUOT; |
941 | goto out; | |
942 | } | |
943 | ||
b1ee94aa YZ |
944 | mode |= S_IFDIR; |
945 | err = ceph_pre_init_acls(dir, &mode, &acls); | |
946 | if (err < 0) | |
947 | goto out; | |
948 | ||
2817b000 SW |
949 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); |
950 | if (IS_ERR(req)) { | |
951 | err = PTR_ERR(req); | |
952 | goto out; | |
953 | } | |
954 | ||
955 | req->r_dentry = dget(dentry); | |
956 | req->r_num_caps = 2; | |
3dd69aab JL |
957 | req->r_parent = dir; |
958 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); | |
2817b000 | 959 | req->r_args.mkdir.mode = cpu_to_le32(mode); |
222b7f90 | 960 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL; |
2817b000 | 961 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
b1ee94aa YZ |
962 | if (acls.pagelist) { |
963 | req->r_pagelist = acls.pagelist; | |
964 | acls.pagelist = NULL; | |
965 | } | |
2817b000 | 966 | err = ceph_mdsc_do_request(mdsc, dir, req); |
275dd19e YZ |
967 | if (!err && |
968 | !req->r_reply_info.head->is_target && | |
969 | !req->r_reply_info.head->is_dentry) | |
2817b000 SW |
970 | err = ceph_handle_notrace_create(dir, dentry); |
971 | ceph_mdsc_put_request(req); | |
972 | out: | |
b20a95a0 | 973 | if (!err) |
2b0143b5 | 974 | ceph_init_inode_acls(d_inode(dentry), &acls); |
b20a95a0 | 975 | else |
2817b000 | 976 | d_drop(dentry); |
b1ee94aa | 977 | ceph_release_acls_info(&acls); |
2817b000 SW |
978 | return err; |
979 | } | |
980 | ||
981 | static int ceph_link(struct dentry *old_dentry, struct inode *dir, | |
982 | struct dentry *dentry) | |
983 | { | |
3d14c5d2 YS |
984 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
985 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 SW |
986 | struct ceph_mds_request *req; |
987 | int err; | |
988 | ||
989 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
990 | return -EROFS; | |
991 | ||
992 | dout("link in dir %p old_dentry %p dentry %p\n", dir, | |
993 | old_dentry, dentry); | |
994 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS); | |
995 | if (IS_ERR(req)) { | |
996 | d_drop(dentry); | |
997 | return PTR_ERR(req); | |
998 | } | |
999 | req->r_dentry = dget(dentry); | |
1000 | req->r_num_caps = 2; | |
4b58c9b1 | 1001 | req->r_old_dentry = dget(old_dentry); |
3dd69aab JL |
1002 | req->r_parent = dir; |
1003 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); | |
2817b000 SW |
1004 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; |
1005 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
ad88f23f | 1006 | /* release LINK_SHARED on source inode (mds will lock it) */ |
d19a0b54 | 1007 | req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; |
2817b000 | 1008 | err = ceph_mdsc_do_request(mdsc, dir, req); |
70b666c3 | 1009 | if (err) { |
2817b000 | 1010 | d_drop(dentry); |
70b666c3 | 1011 | } else if (!req->r_reply_info.head->is_dentry) { |
2b0143b5 DH |
1012 | ihold(d_inode(old_dentry)); |
1013 | d_instantiate(dentry, d_inode(old_dentry)); | |
70b666c3 | 1014 | } |
2817b000 SW |
1015 | ceph_mdsc_put_request(req); |
1016 | return err; | |
1017 | } | |
1018 | ||
2817b000 SW |
1019 | /* |
1020 | * rmdir and unlink are differ only by the metadata op code | |
1021 | */ | |
1022 | static int ceph_unlink(struct inode *dir, struct dentry *dentry) | |
1023 | { | |
3d14c5d2 YS |
1024 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
1025 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2b0143b5 | 1026 | struct inode *inode = d_inode(dentry); |
2817b000 SW |
1027 | struct ceph_mds_request *req; |
1028 | int err = -EROFS; | |
1029 | int op; | |
1030 | ||
1031 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
1032 | /* rmdir .snap/foo is RMSNAP */ | |
a455589f | 1033 | dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry); |
2817b000 SW |
1034 | op = CEPH_MDS_OP_RMSNAP; |
1035 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { | |
1036 | dout("unlink/rmdir dir %p dn %p inode %p\n", | |
1037 | dir, dentry, inode); | |
e36cb0b8 | 1038 | op = d_is_dir(dentry) ? |
2817b000 SW |
1039 | CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK; |
1040 | } else | |
1041 | goto out; | |
1042 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); | |
1043 | if (IS_ERR(req)) { | |
1044 | err = PTR_ERR(req); | |
1045 | goto out; | |
1046 | } | |
1047 | req->r_dentry = dget(dentry); | |
1048 | req->r_num_caps = 2; | |
3dd69aab JL |
1049 | req->r_parent = dir; |
1050 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); | |
2817b000 SW |
1051 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; |
1052 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
6ef0bc6d | 1053 | req->r_inode_drop = ceph_drop_caps_for_unlink(inode); |
2817b000 SW |
1054 | err = ceph_mdsc_do_request(mdsc, dir, req); |
1055 | if (!err && !req->r_reply_info.head->is_dentry) | |
1056 | d_delete(dentry); | |
1057 | ceph_mdsc_put_request(req); | |
1058 | out: | |
1059 | return err; | |
1060 | } | |
1061 | ||
1062 | static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1cd66c93 MS |
1063 | struct inode *new_dir, struct dentry *new_dentry, |
1064 | unsigned int flags) | |
2817b000 | 1065 | { |
3d14c5d2 YS |
1066 | struct ceph_fs_client *fsc = ceph_sb_to_client(old_dir->i_sb); |
1067 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2817b000 | 1068 | struct ceph_mds_request *req; |
0ea611a3 | 1069 | int op = CEPH_MDS_OP_RENAME; |
2817b000 SW |
1070 | int err; |
1071 | ||
1cd66c93 MS |
1072 | if (flags) |
1073 | return -EINVAL; | |
1074 | ||
2817b000 SW |
1075 | if (ceph_snap(old_dir) != ceph_snap(new_dir)) |
1076 | return -EXDEV; | |
0ea611a3 YZ |
1077 | if (ceph_snap(old_dir) != CEPH_NOSNAP) { |
1078 | if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR) | |
1079 | op = CEPH_MDS_OP_RENAMESNAP; | |
1080 | else | |
1081 | return -EROFS; | |
1082 | } | |
cafe21a4 LH |
1083 | /* don't allow cross-quota renames */ |
1084 | if ((old_dir != new_dir) && | |
1085 | (!ceph_quota_is_same_realm(old_dir, new_dir))) | |
1086 | return -EXDEV; | |
1087 | ||
2817b000 SW |
1088 | dout("rename dir %p dentry %p to dir %p dentry %p\n", |
1089 | old_dir, old_dentry, new_dir, new_dentry); | |
0ea611a3 | 1090 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); |
2817b000 SW |
1091 | if (IS_ERR(req)) |
1092 | return PTR_ERR(req); | |
180061a5 | 1093 | ihold(old_dir); |
2817b000 SW |
1094 | req->r_dentry = dget(new_dentry); |
1095 | req->r_num_caps = 2; | |
1096 | req->r_old_dentry = dget(old_dentry); | |
180061a5 | 1097 | req->r_old_dentry_dir = old_dir; |
3dd69aab JL |
1098 | req->r_parent = new_dir; |
1099 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); | |
2817b000 SW |
1100 | req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED; |
1101 | req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL; | |
1102 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
1103 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
1104 | /* release LINK_RDCACHE on source inode (mds will lock it) */ | |
d19a0b54 | 1105 | req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; |
6ef0bc6d ZZ |
1106 | if (d_really_is_positive(new_dentry)) { |
1107 | req->r_inode_drop = | |
1108 | ceph_drop_caps_for_unlink(d_inode(new_dentry)); | |
1109 | } | |
2817b000 SW |
1110 | err = ceph_mdsc_do_request(mdsc, old_dir, req); |
1111 | if (!err && !req->r_reply_info.head->is_dentry) { | |
1112 | /* | |
1113 | * Normally d_move() is done by fill_trace (called by | |
1114 | * do_request, above). If there is no trace, we need | |
1115 | * to do it here. | |
1116 | */ | |
1117 | d_move(old_dentry, new_dentry); | |
1118 | } | |
1119 | ceph_mdsc_put_request(req); | |
1120 | return err; | |
1121 | } | |
1122 | ||
81a6cf2d SW |
1123 | /* |
1124 | * Ensure a dentry lease will no longer revalidate. | |
1125 | */ | |
1126 | void ceph_invalidate_dentry_lease(struct dentry *dentry) | |
1127 | { | |
1128 | spin_lock(&dentry->d_lock); | |
9b16f03c | 1129 | ceph_dentry(dentry)->time = jiffies; |
81a6cf2d SW |
1130 | ceph_dentry(dentry)->lease_shared_gen = 0; |
1131 | spin_unlock(&dentry->d_lock); | |
1132 | } | |
2817b000 SW |
1133 | |
1134 | /* | |
1135 | * Check if dentry lease is valid. If not, delete the lease. Try to | |
1136 | * renew if the least is more than half up. | |
1137 | */ | |
14fb9c9e JL |
1138 | static int dentry_lease_is_valid(struct dentry *dentry, unsigned int flags, |
1139 | struct inode *dir) | |
2817b000 SW |
1140 | { |
1141 | struct ceph_dentry_info *di; | |
1142 | struct ceph_mds_session *s; | |
1143 | int valid = 0; | |
1144 | u32 gen; | |
1145 | unsigned long ttl; | |
1146 | struct ceph_mds_session *session = NULL; | |
2817b000 SW |
1147 | u32 seq = 0; |
1148 | ||
1149 | spin_lock(&dentry->d_lock); | |
1150 | di = ceph_dentry(dentry); | |
14fb9c9e | 1151 | if (di && di->lease_session) { |
2817b000 | 1152 | s = di->lease_session; |
d8fb02ab | 1153 | spin_lock(&s->s_gen_ttl_lock); |
2817b000 SW |
1154 | gen = s->s_cap_gen; |
1155 | ttl = s->s_cap_ttl; | |
d8fb02ab | 1156 | spin_unlock(&s->s_gen_ttl_lock); |
2817b000 SW |
1157 | |
1158 | if (di->lease_gen == gen && | |
9b16f03c | 1159 | time_before(jiffies, di->time) && |
2817b000 SW |
1160 | time_before(jiffies, ttl)) { |
1161 | valid = 1; | |
1162 | if (di->lease_renew_after && | |
1163 | time_after(jiffies, di->lease_renew_after)) { | |
14fb9c9e JL |
1164 | /* |
1165 | * We should renew. If we're in RCU walk mode | |
1166 | * though, we can't do that so just return | |
1167 | * -ECHILD. | |
1168 | */ | |
1169 | if (flags & LOOKUP_RCU) { | |
1170 | valid = -ECHILD; | |
1171 | } else { | |
1172 | session = ceph_get_mds_session(s); | |
1173 | seq = di->lease_seq; | |
1174 | di->lease_renew_after = 0; | |
1175 | di->lease_renew_from = jiffies; | |
1176 | } | |
2817b000 | 1177 | } |
2817b000 SW |
1178 | } |
1179 | } | |
1180 | spin_unlock(&dentry->d_lock); | |
1181 | ||
1182 | if (session) { | |
1183 | ceph_mdsc_lease_send_msg(session, dir, dentry, | |
1184 | CEPH_MDS_LEASE_RENEW, seq); | |
1185 | ceph_put_mds_session(session); | |
1186 | } | |
1187 | dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid); | |
1188 | return valid; | |
1189 | } | |
1190 | ||
1191 | /* | |
1192 | * Check if directory-wide content lease/cap is valid. | |
1193 | */ | |
1194 | static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry) | |
1195 | { | |
1196 | struct ceph_inode_info *ci = ceph_inode(dir); | |
1197 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
1198 | int valid = 0; | |
1199 | ||
be655596 | 1200 | spin_lock(&ci->i_ceph_lock); |
97aeb6bf | 1201 | if (atomic_read(&ci->i_shared_gen) == di->lease_shared_gen) |
2817b000 | 1202 | valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1); |
be655596 | 1203 | spin_unlock(&ci->i_ceph_lock); |
2817b000 | 1204 | dout("dir_lease_is_valid dir %p v%u dentry %p v%u = %d\n", |
97aeb6bf YZ |
1205 | dir, (unsigned)atomic_read(&ci->i_shared_gen), |
1206 | dentry, (unsigned)di->lease_shared_gen, valid); | |
2817b000 SW |
1207 | return valid; |
1208 | } | |
1209 | ||
1210 | /* | |
1211 | * Check if cached dentry can be trusted. | |
1212 | */ | |
0b728e19 | 1213 | static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags) |
2817b000 | 1214 | { |
bf1c6aca | 1215 | int valid = 0; |
641235d8 | 1216 | struct dentry *parent; |
34286d66 NP |
1217 | struct inode *dir; |
1218 | ||
f49d1e05 | 1219 | if (flags & LOOKUP_RCU) { |
52953d55 | 1220 | parent = READ_ONCE(dentry->d_parent); |
f49d1e05 JL |
1221 | dir = d_inode_rcu(parent); |
1222 | if (!dir) | |
1223 | return -ECHILD; | |
1224 | } else { | |
1225 | parent = dget_parent(dentry); | |
1226 | dir = d_inode(parent); | |
1227 | } | |
34286d66 | 1228 | |
a455589f | 1229 | dout("d_revalidate %p '%pd' inode %p offset %lld\n", dentry, |
2b0143b5 | 1230 | dentry, d_inode(dentry), ceph_dentry(dentry)->offset); |
2817b000 SW |
1231 | |
1232 | /* always trust cached snapped dentries, snapdir dentry */ | |
1233 | if (ceph_snap(dir) != CEPH_NOSNAP) { | |
a455589f | 1234 | dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry, |
2b0143b5 | 1235 | dentry, d_inode(dentry)); |
bf1c6aca | 1236 | valid = 1; |
2b0143b5 DH |
1237 | } else if (d_really_is_positive(dentry) && |
1238 | ceph_snap(d_inode(dentry)) == CEPH_SNAPDIR) { | |
bf1c6aca | 1239 | valid = 1; |
14fb9c9e JL |
1240 | } else { |
1241 | valid = dentry_lease_is_valid(dentry, flags, dir); | |
1242 | if (valid == -ECHILD) | |
1243 | return valid; | |
1244 | if (valid || dir_lease_is_valid(dir, dentry)) { | |
1245 | if (d_really_is_positive(dentry)) | |
1246 | valid = ceph_is_any_caps(d_inode(dentry)); | |
1247 | else | |
1248 | valid = 1; | |
1249 | } | |
2817b000 | 1250 | } |
2817b000 | 1251 | |
200fd27c YZ |
1252 | if (!valid) { |
1253 | struct ceph_mds_client *mdsc = | |
1254 | ceph_sb_to_client(dir->i_sb)->mdsc; | |
1255 | struct ceph_mds_request *req; | |
1097680d JL |
1256 | int op, err; |
1257 | u32 mask; | |
200fd27c | 1258 | |
f49d1e05 JL |
1259 | if (flags & LOOKUP_RCU) |
1260 | return -ECHILD; | |
1261 | ||
200fd27c | 1262 | op = ceph_snap(dir) == CEPH_SNAPDIR ? |
5eb9f604 | 1263 | CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; |
200fd27c YZ |
1264 | req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); |
1265 | if (!IS_ERR(req)) { | |
1266 | req->r_dentry = dget(dentry); | |
5eb9f604 JL |
1267 | req->r_num_caps = 2; |
1268 | req->r_parent = dir; | |
200fd27c YZ |
1269 | |
1270 | mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED; | |
1271 | if (ceph_security_xattr_wanted(dir)) | |
1272 | mask |= CEPH_CAP_XATTR_SHARED; | |
1097680d | 1273 | req->r_args.getattr.mask = cpu_to_le32(mask); |
200fd27c | 1274 | |
200fd27c | 1275 | err = ceph_mdsc_do_request(mdsc, NULL, req); |
c3f4688a JL |
1276 | switch (err) { |
1277 | case 0: | |
1278 | if (d_really_is_positive(dentry) && | |
1279 | d_inode(dentry) == req->r_target_inode) | |
1280 | valid = 1; | |
1281 | break; | |
1282 | case -ENOENT: | |
1283 | if (d_really_is_negative(dentry)) | |
1284 | valid = 1; | |
1285 | /* Fallthrough */ | |
1286 | default: | |
1287 | break; | |
200fd27c YZ |
1288 | } |
1289 | ceph_mdsc_put_request(req); | |
1290 | dout("d_revalidate %p lookup result=%d\n", | |
1291 | dentry, err); | |
1292 | } | |
1293 | } | |
1294 | ||
bf1c6aca | 1295 | dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid"); |
9215aeea | 1296 | if (valid) { |
bf1c6aca | 1297 | ceph_dentry_lru_touch(dentry); |
9215aeea YZ |
1298 | } else { |
1299 | ceph_dir_clear_complete(dir); | |
9215aeea | 1300 | } |
641235d8 | 1301 | |
f49d1e05 JL |
1302 | if (!(flags & LOOKUP_RCU)) |
1303 | dput(parent); | |
bf1c6aca | 1304 | return valid; |
2817b000 SW |
1305 | } |
1306 | ||
1307 | /* | |
147851d2 | 1308 | * Release our ceph_dentry_info. |
2817b000 | 1309 | */ |
147851d2 | 1310 | static void ceph_d_release(struct dentry *dentry) |
2817b000 SW |
1311 | { |
1312 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
2817b000 | 1313 | |
147851d2 | 1314 | dout("d_release %p\n", dentry); |
3d8eb7a9 | 1315 | ceph_dentry_lru_del(dentry); |
5b484a51 JL |
1316 | |
1317 | spin_lock(&dentry->d_lock); | |
1318 | dentry->d_fsdata = NULL; | |
1319 | spin_unlock(&dentry->d_lock); | |
1320 | ||
3d8eb7a9 SW |
1321 | if (di->lease_session) |
1322 | ceph_put_mds_session(di->lease_session); | |
1323 | kmem_cache_free(ceph_dentry_cachep, di); | |
2817b000 SW |
1324 | } |
1325 | ||
b58dc410 SW |
1326 | /* |
1327 | * When the VFS prunes a dentry from the cache, we need to clear the | |
1328 | * complete flag on the parent directory. | |
1329 | * | |
1330 | * Called under dentry->d_lock. | |
1331 | */ | |
1332 | static void ceph_d_prune(struct dentry *dentry) | |
1333 | { | |
5495c2d0 YZ |
1334 | struct ceph_inode_info *dir_ci; |
1335 | struct ceph_dentry_info *di; | |
1336 | ||
1337 | dout("ceph_d_prune %pd %p\n", dentry, dentry); | |
b58dc410 SW |
1338 | |
1339 | /* do we have a valid parent? */ | |
8842b3be | 1340 | if (IS_ROOT(dentry)) |
b58dc410 SW |
1341 | return; |
1342 | ||
5495c2d0 YZ |
1343 | /* we hold d_lock, so d_parent is stable */ |
1344 | dir_ci = ceph_inode(d_inode(dentry->d_parent)); | |
1345 | if (dir_ci->i_vino.snap == CEPH_SNAPDIR) | |
b58dc410 | 1346 | return; |
2817b000 | 1347 | |
5495c2d0 YZ |
1348 | /* who calls d_delete() should also disable dcache readdir */ |
1349 | if (d_really_is_negative(dentry)) | |
18fc8abd AV |
1350 | return; |
1351 | ||
5495c2d0 YZ |
1352 | /* d_fsdata does not get cleared until d_release */ |
1353 | if (!d_unhashed(dentry)) { | |
1354 | __ceph_dir_clear_complete(dir_ci); | |
1355 | return; | |
1356 | } | |
1357 | ||
1358 | /* Disable dcache readdir just in case that someone called d_drop() | |
1359 | * or d_invalidate(), but MDS didn't revoke CEPH_CAP_FILE_SHARED | |
1360 | * properly (dcache readdir is still enabled) */ | |
1361 | di = ceph_dentry(dentry); | |
1362 | if (di->offset > 0 && | |
1363 | di->lease_shared_gen == atomic_read(&dir_ci->i_shared_gen)) | |
1364 | __ceph_dir_clear_ordered(dir_ci); | |
b58dc410 | 1365 | } |
2817b000 SW |
1366 | |
1367 | /* | |
1368 | * read() on a dir. This weird interface hack only works if mounted | |
1369 | * with '-o dirstat'. | |
1370 | */ | |
1371 | static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, | |
1372 | loff_t *ppos) | |
1373 | { | |
bb48bd4d | 1374 | struct ceph_dir_file_info *dfi = file->private_data; |
496ad9aa | 1375 | struct inode *inode = file_inode(file); |
2817b000 SW |
1376 | struct ceph_inode_info *ci = ceph_inode(inode); |
1377 | int left; | |
ae598083 | 1378 | const int bufsize = 1024; |
2817b000 | 1379 | |
3d14c5d2 | 1380 | if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT)) |
2817b000 SW |
1381 | return -EISDIR; |
1382 | ||
bb48bd4d CX |
1383 | if (!dfi->dir_info) { |
1384 | dfi->dir_info = kmalloc(bufsize, GFP_KERNEL); | |
1385 | if (!dfi->dir_info) | |
2817b000 | 1386 | return -ENOMEM; |
bb48bd4d CX |
1387 | dfi->dir_info_len = |
1388 | snprintf(dfi->dir_info, bufsize, | |
2817b000 SW |
1389 | "entries: %20lld\n" |
1390 | " files: %20lld\n" | |
1391 | " subdirs: %20lld\n" | |
1392 | "rentries: %20lld\n" | |
1393 | " rfiles: %20lld\n" | |
1394 | " rsubdirs: %20lld\n" | |
1395 | "rbytes: %20lld\n" | |
1396 | "rctime: %10ld.%09ld\n", | |
1397 | ci->i_files + ci->i_subdirs, | |
1398 | ci->i_files, | |
1399 | ci->i_subdirs, | |
1400 | ci->i_rfiles + ci->i_rsubdirs, | |
1401 | ci->i_rfiles, | |
1402 | ci->i_rsubdirs, | |
1403 | ci->i_rbytes, | |
1404 | (long)ci->i_rctime.tv_sec, | |
1405 | (long)ci->i_rctime.tv_nsec); | |
1406 | } | |
1407 | ||
bb48bd4d | 1408 | if (*ppos >= dfi->dir_info_len) |
2817b000 | 1409 | return 0; |
bb48bd4d CX |
1410 | size = min_t(unsigned, size, dfi->dir_info_len-*ppos); |
1411 | left = copy_to_user(buf, dfi->dir_info + *ppos, size); | |
2817b000 SW |
1412 | if (left == size) |
1413 | return -EFAULT; | |
1414 | *ppos += (size - left); | |
1415 | return size - left; | |
1416 | } | |
1417 | ||
2817b000 SW |
1418 | /* |
1419 | * We maintain a private dentry LRU. | |
1420 | * | |
1421 | * FIXME: this needs to be changed to a per-mds lru to be useful. | |
1422 | */ | |
1423 | void ceph_dentry_lru_add(struct dentry *dn) | |
1424 | { | |
1425 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1426 | struct ceph_mds_client *mdsc; | |
2817b000 | 1427 | |
a455589f | 1428 | dout("dentry_lru_add %p %p '%pd'\n", di, dn, dn); |
3d8eb7a9 SW |
1429 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
1430 | spin_lock(&mdsc->dentry_lru_lock); | |
1431 | list_add_tail(&di->lru, &mdsc->dentry_lru); | |
1432 | mdsc->num_dentry++; | |
1433 | spin_unlock(&mdsc->dentry_lru_lock); | |
2817b000 SW |
1434 | } |
1435 | ||
1436 | void ceph_dentry_lru_touch(struct dentry *dn) | |
1437 | { | |
1438 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1439 | struct ceph_mds_client *mdsc; | |
2817b000 | 1440 | |
a455589f AV |
1441 | dout("dentry_lru_touch %p %p '%pd' (offset %lld)\n", di, dn, dn, |
1442 | di->offset); | |
3d8eb7a9 SW |
1443 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
1444 | spin_lock(&mdsc->dentry_lru_lock); | |
1445 | list_move_tail(&di->lru, &mdsc->dentry_lru); | |
1446 | spin_unlock(&mdsc->dentry_lru_lock); | |
2817b000 SW |
1447 | } |
1448 | ||
1449 | void ceph_dentry_lru_del(struct dentry *dn) | |
1450 | { | |
1451 | struct ceph_dentry_info *di = ceph_dentry(dn); | |
1452 | struct ceph_mds_client *mdsc; | |
1453 | ||
a455589f | 1454 | dout("dentry_lru_del %p %p '%pd'\n", di, dn, dn); |
3d8eb7a9 SW |
1455 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
1456 | spin_lock(&mdsc->dentry_lru_lock); | |
1457 | list_del_init(&di->lru); | |
1458 | mdsc->num_dentry--; | |
1459 | spin_unlock(&mdsc->dentry_lru_lock); | |
2817b000 SW |
1460 | } |
1461 | ||
6c0f3af7 SW |
1462 | /* |
1463 | * Return name hash for a given dentry. This is dependent on | |
1464 | * the parent directory's hash function. | |
1465 | */ | |
e5f86dc3 | 1466 | unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn) |
6c0f3af7 | 1467 | { |
6c0f3af7 SW |
1468 | struct ceph_inode_info *dci = ceph_inode(dir); |
1469 | ||
1470 | switch (dci->i_dir_layout.dl_dir_hash) { | |
1471 | case 0: /* for backward compat */ | |
1472 | case CEPH_STR_HASH_LINUX: | |
1473 | return dn->d_name.hash; | |
1474 | ||
1475 | default: | |
1476 | return ceph_str_hash(dci->i_dir_layout.dl_dir_hash, | |
1477 | dn->d_name.name, dn->d_name.len); | |
1478 | } | |
1479 | } | |
1480 | ||
2817b000 SW |
1481 | const struct file_operations ceph_dir_fops = { |
1482 | .read = ceph_read_dir, | |
77acfa29 | 1483 | .iterate = ceph_readdir, |
2817b000 SW |
1484 | .llseek = ceph_dir_llseek, |
1485 | .open = ceph_open, | |
1486 | .release = ceph_release, | |
1487 | .unlocked_ioctl = ceph_ioctl, | |
da819c81 | 1488 | .fsync = ceph_fsync, |
2817b000 SW |
1489 | }; |
1490 | ||
38c48b5f YZ |
1491 | const struct file_operations ceph_snapdir_fops = { |
1492 | .iterate = ceph_readdir, | |
1493 | .llseek = ceph_dir_llseek, | |
1494 | .open = ceph_open, | |
1495 | .release = ceph_release, | |
1496 | }; | |
1497 | ||
2817b000 SW |
1498 | const struct inode_operations ceph_dir_iops = { |
1499 | .lookup = ceph_lookup, | |
1500 | .permission = ceph_permission, | |
1501 | .getattr = ceph_getattr, | |
1502 | .setattr = ceph_setattr, | |
2817b000 | 1503 | .listxattr = ceph_listxattr, |
7221fe4c | 1504 | .get_acl = ceph_get_acl, |
72466d0b | 1505 | .set_acl = ceph_set_acl, |
2817b000 SW |
1506 | .mknod = ceph_mknod, |
1507 | .symlink = ceph_symlink, | |
1508 | .mkdir = ceph_mkdir, | |
1509 | .link = ceph_link, | |
1510 | .unlink = ceph_unlink, | |
1511 | .rmdir = ceph_unlink, | |
1512 | .rename = ceph_rename, | |
1513 | .create = ceph_create, | |
2d83bde9 | 1514 | .atomic_open = ceph_atomic_open, |
2817b000 SW |
1515 | }; |
1516 | ||
38c48b5f YZ |
1517 | const struct inode_operations ceph_snapdir_iops = { |
1518 | .lookup = ceph_lookup, | |
1519 | .permission = ceph_permission, | |
1520 | .getattr = ceph_getattr, | |
1521 | .mkdir = ceph_mkdir, | |
1522 | .rmdir = ceph_unlink, | |
0ea611a3 | 1523 | .rename = ceph_rename, |
38c48b5f YZ |
1524 | }; |
1525 | ||
52dfb8ac | 1526 | const struct dentry_operations ceph_dentry_ops = { |
2817b000 | 1527 | .d_revalidate = ceph_d_revalidate, |
147851d2 | 1528 | .d_release = ceph_d_release, |
b58dc410 | 1529 | .d_prune = ceph_d_prune, |
ad5cb123 | 1530 | .d_init = ceph_d_init, |
2817b000 | 1531 | }; |