]>
Commit | Line | Data |
---|---|---|
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 | 31 | |
37c4efc1 YZ |
32 | static bool __dentry_lease_is_valid(struct ceph_dentry_info *di); |
33 | static int __dir_lease_try_check(const struct dentry *dentry); | |
34 | ||
2817b000 SW |
35 | /* |
36 | * Initialize ceph dentry state. | |
37 | */ | |
ad5cb123 | 38 | static int ceph_d_init(struct dentry *dentry) |
2817b000 SW |
39 | { |
40 | struct ceph_dentry_info *di; | |
2678da88 | 41 | struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dentry->d_sb); |
2817b000 | 42 | |
99ec2697 | 43 | di = kmem_cache_zalloc(ceph_dentry_cachep, GFP_KERNEL); |
2817b000 SW |
44 | if (!di) |
45 | return -ENOMEM; /* oh well */ | |
46 | ||
2817b000 SW |
47 | di->dentry = dentry; |
48 | di->lease_session = NULL; | |
9b16f03c | 49 | di->time = jiffies; |
48d0cbd1 | 50 | dentry->d_fsdata = di; |
37c4efc1 | 51 | INIT_LIST_HEAD(&di->lease_list); |
f9009efa XL |
52 | |
53 | atomic64_inc(&mdsc->metric.total_dentries); | |
54 | ||
2817b000 SW |
55 | return 0; |
56 | } | |
57 | ||
2817b000 | 58 | /* |
f3c4ebe6 YZ |
59 | * for f_pos for readdir: |
60 | * - hash order: | |
61 | * (0xff << 52) | ((24 bits hash) << 28) | | |
62 | * (the nth entry has hash collision); | |
63 | * - frag+name order; | |
64 | * ((frag value) << 28) | (the nth entry in frag); | |
2817b000 | 65 | */ |
f3c4ebe6 YZ |
66 | #define OFFSET_BITS 28 |
67 | #define OFFSET_MASK ((1 << OFFSET_BITS) - 1) | |
68 | #define HASH_ORDER (0xffull << (OFFSET_BITS + 24)) | |
69 | loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order) | |
70 | { | |
71 | loff_t fpos = ((loff_t)high << 28) | (loff_t)off; | |
72 | if (hash_order) | |
73 | fpos |= HASH_ORDER; | |
74 | return fpos; | |
75 | } | |
76 | ||
77 | static bool is_hash_order(loff_t p) | |
78 | { | |
79 | return (p & HASH_ORDER) == HASH_ORDER; | |
80 | } | |
81 | ||
2817b000 SW |
82 | static unsigned fpos_frag(loff_t p) |
83 | { | |
f3c4ebe6 | 84 | return p >> OFFSET_BITS; |
2817b000 | 85 | } |
f3c4ebe6 YZ |
86 | |
87 | static unsigned fpos_hash(loff_t p) | |
88 | { | |
89 | return ceph_frag_value(fpos_frag(p)); | |
90 | } | |
91 | ||
2817b000 SW |
92 | static unsigned fpos_off(loff_t p) |
93 | { | |
f3c4ebe6 | 94 | return p & OFFSET_MASK; |
2817b000 SW |
95 | } |
96 | ||
4d5f5df6 YZ |
97 | static int fpos_cmp(loff_t l, loff_t r) |
98 | { | |
99 | int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r)); | |
100 | if (v) | |
101 | return v; | |
102 | return (int)(fpos_off(l) - fpos_off(r)); | |
103 | } | |
104 | ||
fdd4e158 YZ |
105 | /* |
106 | * make note of the last dentry we read, so we can | |
107 | * continue at the same lexicographical point, | |
108 | * regardless of what dir changes take place on the | |
109 | * server. | |
110 | */ | |
bb48bd4d | 111 | static int note_last_dentry(struct ceph_dir_file_info *dfi, const char *name, |
fdd4e158 YZ |
112 | int len, unsigned next_offset) |
113 | { | |
114 | char *buf = kmalloc(len+1, GFP_KERNEL); | |
115 | if (!buf) | |
116 | return -ENOMEM; | |
bb48bd4d CX |
117 | kfree(dfi->last_name); |
118 | dfi->last_name = buf; | |
119 | memcpy(dfi->last_name, name, len); | |
120 | dfi->last_name[len] = 0; | |
121 | dfi->next_offset = next_offset; | |
122 | dout("note_last_dentry '%s'\n", dfi->last_name); | |
fdd4e158 YZ |
123 | return 0; |
124 | } | |
125 | ||
c530cd24 YZ |
126 | |
127 | static struct dentry * | |
128 | __dcache_find_get_entry(struct dentry *parent, u64 idx, | |
129 | struct ceph_readdir_cache_control *cache_ctl) | |
130 | { | |
131 | struct inode *dir = d_inode(parent); | |
132 | struct dentry *dentry; | |
133 | unsigned idx_mask = (PAGE_SIZE / sizeof(struct dentry *)) - 1; | |
134 | loff_t ptr_pos = idx * sizeof(struct dentry *); | |
135 | pgoff_t ptr_pgoff = ptr_pos >> PAGE_SHIFT; | |
136 | ||
137 | if (ptr_pos >= i_size_read(dir)) | |
138 | return NULL; | |
139 | ||
140 | if (!cache_ctl->page || ptr_pgoff != page_index(cache_ctl->page)) { | |
141 | ceph_readdir_cache_release(cache_ctl); | |
142 | cache_ctl->page = find_lock_page(&dir->i_data, ptr_pgoff); | |
143 | if (!cache_ctl->page) { | |
144 | dout(" page %lu not found\n", ptr_pgoff); | |
145 | return ERR_PTR(-EAGAIN); | |
146 | } | |
147 | /* reading/filling the cache are serialized by | |
148 | i_mutex, no need to use page lock */ | |
149 | unlock_page(cache_ctl->page); | |
150 | cache_ctl->dentries = kmap(cache_ctl->page); | |
151 | } | |
152 | ||
153 | cache_ctl->index = idx & idx_mask; | |
154 | ||
155 | rcu_read_lock(); | |
156 | spin_lock(&parent->d_lock); | |
157 | /* check i_size again here, because empty directory can be | |
158 | * marked as complete while not holding the i_mutex. */ | |
159 | if (ceph_dir_is_complete_ordered(dir) && ptr_pos < i_size_read(dir)) | |
160 | dentry = cache_ctl->dentries[cache_ctl->index]; | |
161 | else | |
162 | dentry = NULL; | |
163 | spin_unlock(&parent->d_lock); | |
164 | if (dentry && !lockref_get_not_dead(&dentry->d_lockref)) | |
165 | dentry = NULL; | |
166 | rcu_read_unlock(); | |
167 | return dentry ? : ERR_PTR(-EAGAIN); | |
168 | } | |
169 | ||
2817b000 SW |
170 | /* |
171 | * When possible, we try to satisfy a readdir by peeking at the | |
172 | * dcache. We make this work by carefully ordering dentries on | |
946e51f2 | 173 | * d_child when we initially get results back from the MDS, and |
2817b000 SW |
174 | * falling back to a "normal" sync readdir if any dentries in the dir |
175 | * are dropped. | |
176 | * | |
2f276c51 | 177 | * Complete dir indicates that we have all dentries in the dir. It is |
2817b000 SW |
178 | * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by |
179 | * the MDS if/when the directory is modified). | |
180 | */ | |
a30be7cb | 181 | static int __dcache_readdir(struct file *file, struct dir_context *ctx, |
97aeb6bf | 182 | int shared_gen) |
2817b000 | 183 | { |
bb48bd4d | 184 | struct ceph_dir_file_info *dfi = file->private_data; |
b583043e | 185 | struct dentry *parent = file->f_path.dentry; |
2b0143b5 | 186 | struct inode *dir = d_inode(parent); |
fdd4e158 | 187 | struct dentry *dentry, *last = NULL; |
2817b000 | 188 | struct ceph_dentry_info *di; |
fdd4e158 | 189 | struct ceph_readdir_cache_control cache_ctl = {}; |
c530cd24 YZ |
190 | u64 idx = 0; |
191 | int err = 0; | |
2817b000 | 192 | |
97aeb6bf | 193 | dout("__dcache_readdir %p v%u at %llx\n", dir, (unsigned)shared_gen, ctx->pos); |
2817b000 | 194 | |
c530cd24 YZ |
195 | /* search start position */ |
196 | if (ctx->pos > 2) { | |
197 | u64 count = div_u64(i_size_read(dir), sizeof(struct dentry *)); | |
198 | while (count > 0) { | |
199 | u64 step = count >> 1; | |
200 | dentry = __dcache_find_get_entry(parent, idx + step, | |
201 | &cache_ctl); | |
202 | if (!dentry) { | |
203 | /* use linar search */ | |
204 | idx = 0; | |
205 | break; | |
206 | } | |
207 | if (IS_ERR(dentry)) { | |
208 | err = PTR_ERR(dentry); | |
209 | goto out; | |
210 | } | |
211 | di = ceph_dentry(dentry); | |
212 | spin_lock(&dentry->d_lock); | |
213 | if (fpos_cmp(di->offset, ctx->pos) < 0) { | |
214 | idx += step + 1; | |
215 | count -= step + 1; | |
216 | } else { | |
217 | count = step; | |
218 | } | |
219 | spin_unlock(&dentry->d_lock); | |
220 | dput(dentry); | |
221 | } | |
2817b000 | 222 | |
c530cd24 | 223 | dout("__dcache_readdir %p cache idx %llu\n", dir, idx); |
2817b000 SW |
224 | } |
225 | ||
fdd4e158 | 226 | |
c530cd24 YZ |
227 | for (;;) { |
228 | bool emit_dentry = false; | |
229 | dentry = __dcache_find_get_entry(parent, idx++, &cache_ctl); | |
230 | if (!dentry) { | |
bb48bd4d | 231 | dfi->file_info.flags |= CEPH_F_ATEND; |
fdd4e158 YZ |
232 | err = 0; |
233 | break; | |
2817b000 | 234 | } |
c530cd24 YZ |
235 | if (IS_ERR(dentry)) { |
236 | err = PTR_ERR(dentry); | |
237 | goto out; | |
fdd4e158 YZ |
238 | } |
239 | ||
fdd4e158 | 240 | spin_lock(&dentry->d_lock); |
5495c2d0 YZ |
241 | di = ceph_dentry(dentry); |
242 | if (d_unhashed(dentry) || | |
243 | d_really_is_negative(dentry) || | |
244 | di->lease_shared_gen != shared_gen) { | |
245 | spin_unlock(&dentry->d_lock); | |
246 | dput(dentry); | |
247 | err = -EAGAIN; | |
248 | goto out; | |
249 | } | |
250 | if (fpos_cmp(ctx->pos, di->offset) <= 0) { | |
37c4efc1 | 251 | __ceph_dentry_dir_lease_touch(di); |
fdd4e158 YZ |
252 | emit_dentry = true; |
253 | } | |
da502956 | 254 | spin_unlock(&dentry->d_lock); |
2817b000 | 255 | |
fdd4e158 | 256 | if (emit_dentry) { |
f3c4ebe6 | 257 | dout(" %llx dentry %p %pd %p\n", di->offset, |
fdd4e158 YZ |
258 | dentry, dentry, d_inode(dentry)); |
259 | ctx->pos = di->offset; | |
260 | if (!dir_emit(ctx, dentry->d_name.name, | |
ebce3eb2 | 261 | dentry->d_name.len, ceph_present_inode(d_inode(dentry)), |
fdd4e158 YZ |
262 | d_inode(dentry)->i_mode >> 12)) { |
263 | dput(dentry); | |
264 | err = 0; | |
265 | break; | |
266 | } | |
267 | ctx->pos++; | |
0081bd83 | 268 | |
fdd4e158 YZ |
269 | if (last) |
270 | dput(last); | |
271 | last = dentry; | |
272 | } else { | |
273 | dput(dentry); | |
2817b000 | 274 | } |
fdd4e158 | 275 | } |
c530cd24 | 276 | out: |
fdd4e158 YZ |
277 | ceph_readdir_cache_release(&cache_ctl); |
278 | if (last) { | |
279 | int ret; | |
280 | di = ceph_dentry(last); | |
bb48bd4d | 281 | ret = note_last_dentry(dfi, last->d_name.name, last->d_name.len, |
fdd4e158 YZ |
282 | fpos_off(di->offset) + 1); |
283 | if (ret < 0) | |
284 | err = ret; | |
2817b000 | 285 | dput(last); |
84583cfb | 286 | /* last_name no longer match cache index */ |
bb48bd4d CX |
287 | if (dfi->readdir_cache_idx >= 0) { |
288 | dfi->readdir_cache_idx = -1; | |
289 | dfi->dir_release_count = 0; | |
84583cfb | 290 | } |
fdd4e158 | 291 | } |
2817b000 SW |
292 | return err; |
293 | } | |
294 | ||
bb48bd4d | 295 | static bool need_send_readdir(struct ceph_dir_file_info *dfi, loff_t pos) |
f3c4ebe6 | 296 | { |
bb48bd4d | 297 | if (!dfi->last_readdir) |
f3c4ebe6 YZ |
298 | return true; |
299 | if (is_hash_order(pos)) | |
bb48bd4d | 300 | return !ceph_frag_contains_value(dfi->frag, fpos_hash(pos)); |
f3c4ebe6 | 301 | else |
bb48bd4d | 302 | return dfi->frag != fpos_frag(pos); |
f3c4ebe6 YZ |
303 | } |
304 | ||
77acfa29 | 305 | static int ceph_readdir(struct file *file, struct dir_context *ctx) |
2817b000 | 306 | { |
bb48bd4d | 307 | struct ceph_dir_file_info *dfi = file->private_data; |
77acfa29 | 308 | struct inode *inode = file_inode(file); |
2817b000 | 309 | struct ceph_inode_info *ci = ceph_inode(inode); |
3d14c5d2 YS |
310 | struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
311 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
8974eebd | 312 | int i; |
2817b000 | 313 | int err; |
b50c2de5 | 314 | unsigned frag = -1; |
2817b000 | 315 | struct ceph_mds_reply_info_parsed *rinfo; |
2817b000 | 316 | |
8974eebd | 317 | dout("readdir %p file %p pos %llx\n", inode, file, ctx->pos); |
bb48bd4d | 318 | if (dfi->file_info.flags & CEPH_F_ATEND) |
2817b000 SW |
319 | return 0; |
320 | ||
321 | /* always start with . and .. */ | |
77acfa29 | 322 | if (ctx->pos == 0) { |
2817b000 | 323 | dout("readdir off 0 -> '.'\n"); |
ebce3eb2 | 324 | if (!dir_emit(ctx, ".", 1, ceph_present_inode(inode), |
77acfa29 | 325 | inode->i_mode >> 12)) |
2817b000 | 326 | return 0; |
77acfa29 | 327 | ctx->pos = 1; |
2817b000 | 328 | } |
77acfa29 | 329 | if (ctx->pos == 1) { |
ebce3eb2 JL |
330 | u64 ino; |
331 | struct dentry *dentry = file->f_path.dentry; | |
332 | ||
333 | spin_lock(&dentry->d_lock); | |
334 | ino = ceph_present_inode(dentry->d_parent->d_inode); | |
335 | spin_unlock(&dentry->d_lock); | |
336 | ||
2817b000 | 337 | dout("readdir off 1 -> '..'\n"); |
ebce3eb2 | 338 | if (!dir_emit(ctx, "..", 2, ino, inode->i_mode >> 12)) |
2817b000 | 339 | return 0; |
77acfa29 | 340 | ctx->pos = 2; |
2817b000 SW |
341 | } |
342 | ||
be655596 | 343 | spin_lock(&ci->i_ceph_lock); |
719a2514 YZ |
344 | /* request Fx cap. if have Fx, we don't need to release Fs cap |
345 | * for later create/unlink. */ | |
346 | __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_WR); | |
347 | /* can we use the dcache? */ | |
fdd4e158 | 348 | if (ceph_test_mount_opt(fsc, DCACHE) && |
3d14c5d2 | 349 | !ceph_test_mount_opt(fsc, NOASYNCREADDIR) && |
a0dff78d | 350 | ceph_snap(inode) != CEPH_SNAPDIR && |
70db4f36 | 351 | __ceph_dir_is_complete_ordered(ci) && |
1af16d54 | 352 | __ceph_caps_issued_mask_metric(ci, CEPH_CAP_FILE_SHARED, 1)) { |
97aeb6bf | 353 | int shared_gen = atomic_read(&ci->i_shared_gen); |
1af16d54 | 354 | |
be655596 | 355 | spin_unlock(&ci->i_ceph_lock); |
a30be7cb | 356 | err = __dcache_readdir(file, ctx, shared_gen); |
efa4c120 | 357 | if (err != -EAGAIN) |
2817b000 | 358 | return err; |
efa4c120 | 359 | } else { |
be655596 | 360 | spin_unlock(&ci->i_ceph_lock); |
2817b000 | 361 | } |
2817b000 SW |
362 | |
363 | /* proceed with a normal readdir */ | |
2817b000 SW |
364 | more: |
365 | /* do we have the correct frag content buffered? */ | |
bb48bd4d | 366 | if (need_send_readdir(dfi, ctx->pos)) { |
2817b000 SW |
367 | struct ceph_mds_request *req; |
368 | int op = ceph_snap(inode) == CEPH_SNAPDIR ? | |
369 | CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR; | |
370 | ||
371 | /* discard old result, if any */ | |
bb48bd4d CX |
372 | if (dfi->last_readdir) { |
373 | ceph_mdsc_put_request(dfi->last_readdir); | |
374 | dfi->last_readdir = NULL; | |
393f6620 | 375 | } |
2817b000 | 376 | |
f3c4ebe6 | 377 | if (is_hash_order(ctx->pos)) { |
b50c2de5 YZ |
378 | /* fragtree isn't always accurate. choose frag |
379 | * based on previous reply when possible. */ | |
380 | if (frag == (unsigned)-1) | |
381 | frag = ceph_choose_frag(ci, fpos_hash(ctx->pos), | |
382 | NULL, NULL); | |
f3c4ebe6 YZ |
383 | } else { |
384 | frag = fpos_frag(ctx->pos); | |
385 | } | |
386 | ||
2817b000 | 387 | dout("readdir fetching %llx.%llx frag %x offset '%s'\n", |
bb48bd4d | 388 | ceph_vinop(inode), frag, dfi->last_name); |
2817b000 SW |
389 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); |
390 | if (IS_ERR(req)) | |
391 | return PTR_ERR(req); | |
54008399 YZ |
392 | err = ceph_alloc_readdir_reply_buffer(req, inode); |
393 | if (err) { | |
394 | ceph_mdsc_put_request(req); | |
395 | return err; | |
396 | } | |
2817b000 SW |
397 | /* hints to request -> mds selection code */ |
398 | req->r_direct_mode = USE_AUTH_MDS; | |
5d37ca14 YZ |
399 | if (op == CEPH_MDS_OP_READDIR) { |
400 | req->r_direct_hash = ceph_frag_value(frag); | |
401 | __set_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags); | |
87c91a96 | 402 | req->r_inode_drop = CEPH_CAP_FILE_EXCL; |
5d37ca14 | 403 | } |
bb48bd4d CX |
404 | if (dfi->last_name) { |
405 | req->r_path2 = kstrdup(dfi->last_name, GFP_KERNEL); | |
a149bb9a SK |
406 | if (!req->r_path2) { |
407 | ceph_mdsc_put_request(req); | |
408 | return -ENOMEM; | |
409 | } | |
79162547 YZ |
410 | } else if (is_hash_order(ctx->pos)) { |
411 | req->r_args.readdir.offset_hash = | |
412 | cpu_to_le32(fpos_hash(ctx->pos)); | |
a149bb9a | 413 | } |
79162547 | 414 | |
bb48bd4d CX |
415 | req->r_dir_release_cnt = dfi->dir_release_count; |
416 | req->r_dir_ordered_cnt = dfi->dir_ordered_count; | |
417 | req->r_readdir_cache_idx = dfi->readdir_cache_idx; | |
418 | req->r_readdir_offset = dfi->next_offset; | |
2817b000 | 419 | req->r_args.readdir.frag = cpu_to_le32(frag); |
956d39d6 YZ |
420 | req->r_args.readdir.flags = |
421 | cpu_to_le16(CEPH_READDIR_REPLY_BITFLAGS); | |
a149bb9a SK |
422 | |
423 | req->r_inode = inode; | |
424 | ihold(inode); | |
425 | req->r_dentry = dget(file->f_path.dentry); | |
2817b000 SW |
426 | err = ceph_mdsc_do_request(mdsc, NULL, req); |
427 | if (err < 0) { | |
428 | ceph_mdsc_put_request(req); | |
429 | return err; | |
430 | } | |
f3c4ebe6 YZ |
431 | dout("readdir got and parsed readdir result=%d on " |
432 | "frag %x, end=%d, complete=%d, hash_order=%d\n", | |
433 | err, frag, | |
2817b000 | 434 | (int)req->r_reply_info.dir_end, |
f3c4ebe6 YZ |
435 | (int)req->r_reply_info.dir_complete, |
436 | (int)req->r_reply_info.hash_order); | |
2817b000 | 437 | |
81c6aea5 YZ |
438 | rinfo = &req->r_reply_info; |
439 | if (le32_to_cpu(rinfo->dir_dir->frag) != frag) { | |
440 | frag = le32_to_cpu(rinfo->dir_dir->frag); | |
f3c4ebe6 | 441 | if (!rinfo->hash_order) { |
bb48bd4d | 442 | dfi->next_offset = req->r_readdir_offset; |
f3c4ebe6 YZ |
443 | /* adjust ctx->pos to beginning of frag */ |
444 | ctx->pos = ceph_make_fpos(frag, | |
bb48bd4d | 445 | dfi->next_offset, |
f3c4ebe6 YZ |
446 | false); |
447 | } | |
81c6aea5 | 448 | } |
fdd4e158 | 449 | |
bb48bd4d CX |
450 | dfi->frag = frag; |
451 | dfi->last_readdir = req; | |
2817b000 | 452 | |
bc2de10d | 453 | if (test_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags)) { |
bb48bd4d CX |
454 | dfi->readdir_cache_idx = req->r_readdir_cache_idx; |
455 | if (dfi->readdir_cache_idx < 0) { | |
fdd4e158 | 456 | /* preclude from marking dir ordered */ |
bb48bd4d | 457 | dfi->dir_ordered_count = 0; |
8974eebd | 458 | } else if (ceph_frag_is_leftmost(frag) && |
bb48bd4d | 459 | dfi->next_offset == 2) { |
fdd4e158 YZ |
460 | /* note dir version at start of readdir so |
461 | * we can tell if any dentries get dropped */ | |
bb48bd4d CX |
462 | dfi->dir_release_count = req->r_dir_release_cnt; |
463 | dfi->dir_ordered_count = req->r_dir_ordered_cnt; | |
fdd4e158 YZ |
464 | } |
465 | } else { | |
4c069a58 | 466 | dout("readdir !did_prepopulate\n"); |
fdd4e158 | 467 | /* disable readdir cache */ |
bb48bd4d | 468 | dfi->readdir_cache_idx = -1; |
fdd4e158 | 469 | /* preclude from marking dir complete */ |
bb48bd4d | 470 | dfi->dir_release_count = 0; |
fdd4e158 YZ |
471 | } |
472 | ||
f3c4ebe6 YZ |
473 | /* note next offset and last dentry name */ |
474 | if (rinfo->dir_nr > 0) { | |
2a5beea3 YZ |
475 | struct ceph_mds_reply_dir_entry *rde = |
476 | rinfo->dir_entries + (rinfo->dir_nr-1); | |
f3c4ebe6 YZ |
477 | unsigned next_offset = req->r_reply_info.dir_end ? |
478 | 2 : (fpos_off(rde->offset) + 1); | |
bb48bd4d | 479 | err = note_last_dentry(dfi, rde->name, rde->name_len, |
f3c4ebe6 | 480 | next_offset); |
2817b000 SW |
481 | if (err) |
482 | return err; | |
f3c4ebe6 | 483 | } else if (req->r_reply_info.dir_end) { |
bb48bd4d | 484 | dfi->next_offset = 2; |
f3c4ebe6 | 485 | /* keep last name */ |
2817b000 SW |
486 | } |
487 | } | |
488 | ||
bb48bd4d | 489 | rinfo = &dfi->last_readdir->r_reply_info; |
8974eebd | 490 | dout("readdir frag %x num %d pos %llx chunk first %llx\n", |
bb48bd4d | 491 | dfi->frag, rinfo->dir_nr, ctx->pos, |
8974eebd | 492 | rinfo->dir_nr ? rinfo->dir_entries[0].offset : 0LL); |
77acfa29 | 493 | |
8974eebd YZ |
494 | i = 0; |
495 | /* search start position */ | |
496 | if (rinfo->dir_nr > 0) { | |
497 | int step, nr = rinfo->dir_nr; | |
498 | while (nr > 0) { | |
499 | step = nr >> 1; | |
500 | if (rinfo->dir_entries[i + step].offset < ctx->pos) { | |
501 | i += step + 1; | |
502 | nr -= step + 1; | |
503 | } else { | |
504 | nr = step; | |
505 | } | |
506 | } | |
507 | } | |
508 | for (; i < rinfo->dir_nr; i++) { | |
509 | struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i; | |
3105c19c | 510 | |
8974eebd YZ |
511 | BUG_ON(rde->offset < ctx->pos); |
512 | ||
513 | ctx->pos = rde->offset; | |
514 | dout("readdir (%d/%d) -> %llx '%.*s' %p\n", | |
515 | i, rinfo->dir_nr, ctx->pos, | |
2a5beea3 | 516 | rde->name_len, rde->name, &rde->inode.in); |
8974eebd | 517 | |
2a5beea3 | 518 | BUG_ON(!rde->inode.in); |
8974eebd | 519 | |
2a5beea3 | 520 | if (!dir_emit(ctx, rde->name, rde->name_len, |
ebce3eb2 JL |
521 | ceph_present_ino(inode->i_sb, le64_to_cpu(rde->inode.in->ino)), |
522 | le32_to_cpu(rde->inode.in->mode) >> 12)) { | |
2817b000 SW |
523 | dout("filldir stopping us...\n"); |
524 | return 0; | |
525 | } | |
77acfa29 | 526 | ctx->pos++; |
2817b000 SW |
527 | } |
528 | ||
bb48bd4d CX |
529 | ceph_mdsc_put_request(dfi->last_readdir); |
530 | dfi->last_readdir = NULL; | |
b50c2de5 | 531 | |
bb48bd4d CX |
532 | if (dfi->next_offset > 2) { |
533 | frag = dfi->frag; | |
2817b000 SW |
534 | goto more; |
535 | } | |
536 | ||
537 | /* more frags? */ | |
bb48bd4d CX |
538 | if (!ceph_frag_is_rightmost(dfi->frag)) { |
539 | frag = ceph_frag_next(dfi->frag); | |
f3c4ebe6 YZ |
540 | if (is_hash_order(ctx->pos)) { |
541 | loff_t new_pos = ceph_make_fpos(ceph_frag_value(frag), | |
bb48bd4d | 542 | dfi->next_offset, true); |
f3c4ebe6 YZ |
543 | if (new_pos > ctx->pos) |
544 | ctx->pos = new_pos; | |
545 | /* keep last_name */ | |
546 | } else { | |
bb48bd4d CX |
547 | ctx->pos = ceph_make_fpos(frag, dfi->next_offset, |
548 | false); | |
549 | kfree(dfi->last_name); | |
550 | dfi->last_name = NULL; | |
f3c4ebe6 | 551 | } |
2817b000 SW |
552 | dout("readdir next frag is %x\n", frag); |
553 | goto more; | |
554 | } | |
bb48bd4d | 555 | dfi->file_info.flags |= CEPH_F_ATEND; |
2817b000 SW |
556 | |
557 | /* | |
558 | * if dir_release_count still matches the dir, no dentries | |
559 | * were released during the whole readdir, and we should have | |
560 | * the complete dir contents in our cache. | |
561 | */ | |
bb48bd4d CX |
562 | if (atomic64_read(&ci->i_release_count) == |
563 | dfi->dir_release_count) { | |
fdd4e158 | 564 | spin_lock(&ci->i_ceph_lock); |
bb48bd4d CX |
565 | if (dfi->dir_ordered_count == |
566 | atomic64_read(&ci->i_ordered_count)) { | |
70db4f36 | 567 | dout(" marking %p complete and ordered\n", inode); |
fdd4e158 YZ |
568 | /* use i_size to track number of entries in |
569 | * readdir cache */ | |
bb48bd4d CX |
570 | BUG_ON(dfi->readdir_cache_idx < 0); |
571 | i_size_write(inode, dfi->readdir_cache_idx * | |
fdd4e158 YZ |
572 | sizeof(struct dentry*)); |
573 | } else { | |
70db4f36 | 574 | dout(" marking %p complete\n", inode); |
fdd4e158 | 575 | } |
bb48bd4d CX |
576 | __ceph_dir_set_complete(ci, dfi->dir_release_count, |
577 | dfi->dir_ordered_count); | |
fdd4e158 | 578 | spin_unlock(&ci->i_ceph_lock); |
2817b000 | 579 | } |
2817b000 | 580 | |
77acfa29 | 581 | dout("readdir %p file %p done.\n", inode, file); |
2817b000 SW |
582 | return 0; |
583 | } | |
584 | ||
bb48bd4d | 585 | static void reset_readdir(struct ceph_dir_file_info *dfi) |
2817b000 | 586 | { |
bb48bd4d CX |
587 | if (dfi->last_readdir) { |
588 | ceph_mdsc_put_request(dfi->last_readdir); | |
589 | dfi->last_readdir = NULL; | |
2817b000 | 590 | } |
bb48bd4d CX |
591 | kfree(dfi->last_name); |
592 | dfi->last_name = NULL; | |
593 | dfi->dir_release_count = 0; | |
594 | dfi->readdir_cache_idx = -1; | |
595 | dfi->next_offset = 2; /* compensate for . and .. */ | |
596 | dfi->file_info.flags &= ~CEPH_F_ATEND; | |
2817b000 SW |
597 | } |
598 | ||
8974eebd YZ |
599 | /* |
600 | * discard buffered readdir content on seekdir(0), or seek to new frag, | |
601 | * or seek prior to current chunk | |
602 | */ | |
bb48bd4d | 603 | static bool need_reset_readdir(struct ceph_dir_file_info *dfi, loff_t new_pos) |
8974eebd YZ |
604 | { |
605 | struct ceph_mds_reply_info_parsed *rinfo; | |
f3c4ebe6 | 606 | loff_t chunk_offset; |
8974eebd YZ |
607 | if (new_pos == 0) |
608 | return true; | |
f3c4ebe6 YZ |
609 | if (is_hash_order(new_pos)) { |
610 | /* no need to reset last_name for a forward seek when | |
611 | * dentries are sotred in hash order */ | |
bb48bd4d | 612 | } else if (dfi->frag != fpos_frag(new_pos)) { |
8974eebd | 613 | return true; |
f3c4ebe6 | 614 | } |
bb48bd4d | 615 | rinfo = dfi->last_readdir ? &dfi->last_readdir->r_reply_info : NULL; |
8974eebd YZ |
616 | if (!rinfo || !rinfo->dir_nr) |
617 | return true; | |
f3c4ebe6 YZ |
618 | chunk_offset = rinfo->dir_entries[0].offset; |
619 | return new_pos < chunk_offset || | |
620 | is_hash_order(new_pos) != is_hash_order(chunk_offset); | |
8974eebd YZ |
621 | } |
622 | ||
965c8e59 | 623 | static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence) |
2817b000 | 624 | { |
bb48bd4d | 625 | struct ceph_dir_file_info *dfi = file->private_data; |
2817b000 | 626 | struct inode *inode = file->f_mapping->host; |
2817b000 SW |
627 | loff_t retval; |
628 | ||
5955102c | 629 | inode_lock(inode); |
06222e49 | 630 | retval = -EINVAL; |
965c8e59 | 631 | switch (whence) { |
2817b000 SW |
632 | case SEEK_CUR: |
633 | offset += file->f_pos; | |
fcaddb1d | 634 | break; |
06222e49 JB |
635 | case SEEK_SET: |
636 | break; | |
fdd4e158 YZ |
637 | case SEEK_END: |
638 | retval = -EOPNOTSUPP; | |
fcaddb1d | 639 | goto out; |
06222e49 JB |
640 | default: |
641 | goto out; | |
2817b000 | 642 | } |
06222e49 | 643 | |
f0494206 | 644 | if (offset >= 0) { |
bb48bd4d | 645 | if (need_reset_readdir(dfi, offset)) { |
f3c4ebe6 | 646 | dout("dir_llseek dropping %p content\n", file); |
bb48bd4d | 647 | reset_readdir(dfi); |
f3c4ebe6 YZ |
648 | } else if (is_hash_order(offset) && offset > file->f_pos) { |
649 | /* for hash offset, we don't know if a forward seek | |
650 | * is within same frag */ | |
bb48bd4d CX |
651 | dfi->dir_release_count = 0; |
652 | dfi->readdir_cache_idx = -1; | |
f3c4ebe6 YZ |
653 | } |
654 | ||
2817b000 SW |
655 | if (offset != file->f_pos) { |
656 | file->f_pos = offset; | |
657 | file->f_version = 0; | |
bb48bd4d | 658 | dfi->file_info.flags &= ~CEPH_F_ATEND; |
2817b000 SW |
659 | } |
660 | retval = offset; | |
2817b000 | 661 | } |
06222e49 | 662 | out: |
5955102c | 663 | inode_unlock(inode); |
2817b000 SW |
664 | return retval; |
665 | } | |
666 | ||
667 | /* | |
468640e3 | 668 | * Handle lookups for the hidden .snap directory. |
2817b000 | 669 | */ |
aa60cfc3 | 670 | struct dentry *ceph_handle_snapdir(struct ceph_mds_request *req, |
7a971e2c | 671 | struct dentry *dentry) |
2817b000 | 672 | { |
3d14c5d2 | 673 | struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); |
2b0143b5 | 674 | struct inode *parent = d_inode(dentry->d_parent); /* we hold i_mutex */ |
2817b000 SW |
675 | |
676 | /* .snap dir? */ | |
7a971e2c | 677 | if (ceph_snap(parent) == CEPH_NOSNAP && |
aa60cfc3 JL |
678 | strcmp(dentry->d_name.name, fsc->mount_options->snapdir_name) == 0) { |
679 | struct dentry *res; | |
2817b000 | 680 | struct inode *inode = ceph_get_snapdir(parent); |
aa60cfc3 JL |
681 | |
682 | res = d_splice_alias(inode, dentry); | |
683 | dout("ENOENT on snapdir %p '%pd', linking to snapdir %p. Spliced dentry %p\n", | |
684 | dentry, dentry, inode, res); | |
685 | if (res) | |
686 | dentry = res; | |
2817b000 | 687 | } |
aa60cfc3 | 688 | return dentry; |
468640e3 | 689 | } |
2817b000 | 690 | |
468640e3 SW |
691 | /* |
692 | * Figure out final result of a lookup/open request. | |
693 | * | |
694 | * Mainly, make sure we return the final req->r_dentry (if it already | |
695 | * existed) in place of the original VFS-provided dentry when they | |
696 | * differ. | |
697 | * | |
698 | * Gracefully handle the case where the MDS replies with -ENOENT and | |
699 | * no trace (which it may do, at its discretion, e.g., if it doesn't | |
700 | * care to issue a lease on the negative dentry). | |
701 | */ | |
702 | struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, | |
703 | struct dentry *dentry, int err) | |
704 | { | |
2817b000 SW |
705 | if (err == -ENOENT) { |
706 | /* no trace? */ | |
707 | err = 0; | |
708 | if (!req->r_reply_info.head->is_dentry) { | |
709 | dout("ENOENT and no trace, dentry %p inode %p\n", | |
2b0143b5 DH |
710 | dentry, d_inode(dentry)); |
711 | if (d_really_is_positive(dentry)) { | |
2817b000 SW |
712 | d_drop(dentry); |
713 | err = -ENOENT; | |
714 | } else { | |
715 | d_add(dentry, NULL); | |
716 | } | |
717 | } | |
718 | } | |
719 | if (err) | |
720 | dentry = ERR_PTR(err); | |
721 | else if (dentry != req->r_dentry) | |
722 | dentry = dget(req->r_dentry); /* we got spliced */ | |
723 | else | |
724 | dentry = NULL; | |
725 | return dentry; | |
726 | } | |
727 | ||
3b33f692 | 728 | static bool is_root_ceph_dentry(struct inode *inode, struct dentry *dentry) |
1d1de916 SW |
729 | { |
730 | return ceph_ino(inode) == CEPH_INO_ROOT && | |
731 | strncmp(dentry->d_name.name, ".ceph", 5) == 0; | |
732 | } | |
733 | ||
2817b000 SW |
734 | /* |
735 | * Look up a single dir entry. If there is a lookup intent, inform | |
736 | * the MDS so that it gets our 'caps wanted' value in a single op. | |
737 | */ | |
738 | static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry, | |
00cd8dd3 | 739 | unsigned int flags) |
2817b000 | 740 | { |
3d14c5d2 | 741 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
2678da88 | 742 | struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); |
2817b000 SW |
743 | struct ceph_mds_request *req; |
744 | int op; | |
315f2408 | 745 | int mask; |
2817b000 SW |
746 | int err; |
747 | ||
a455589f AV |
748 | dout("lookup %p dentry %p '%pd'\n", |
749 | dir, dentry, dentry); | |
2817b000 SW |
750 | |
751 | if (dentry->d_name.len > NAME_MAX) | |
752 | return ERR_PTR(-ENAMETOOLONG); | |
753 | ||
2817b000 | 754 | /* can we conclude ENOENT locally? */ |
2b0143b5 | 755 | if (d_really_is_negative(dentry)) { |
2817b000 SW |
756 | struct ceph_inode_info *ci = ceph_inode(dir); |
757 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
758 | ||
be655596 | 759 | spin_lock(&ci->i_ceph_lock); |
891f3f5a | 760 | dout(" dir %p flags are 0x%lx\n", dir, ci->i_ceph_flags); |
2817b000 | 761 | if (strncmp(dentry->d_name.name, |
3d14c5d2 | 762 | fsc->mount_options->snapdir_name, |
2817b000 | 763 | dentry->d_name.len) && |
1d1de916 | 764 | !is_root_ceph_dentry(dir, dentry) && |
e2c3de04 | 765 | ceph_test_mount_opt(fsc, DCACHE) && |
2f276c51 | 766 | __ceph_dir_is_complete(ci) && |
1af16d54 | 767 | __ceph_caps_issued_mask_metric(ci, CEPH_CAP_FILE_SHARED, 1)) { |
719a2514 | 768 | __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_RD); |
be655596 | 769 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
770 | dout(" dir %p complete, -ENOENT\n", dir); |
771 | d_add(dentry, NULL); | |
97aeb6bf | 772 | di->lease_shared_gen = atomic_read(&ci->i_shared_gen); |
2817b000 SW |
773 | return NULL; |
774 | } | |
be655596 | 775 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
776 | } |
777 | ||
778 | op = ceph_snap(dir) == CEPH_SNAPDIR ? | |
779 | CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; | |
780 | req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); | |
781 | if (IS_ERR(req)) | |
7e34bc52 | 782 | return ERR_CAST(req); |
2817b000 SW |
783 | req->r_dentry = dget(dentry); |
784 | req->r_num_caps = 2; | |
315f2408 YZ |
785 | |
786 | mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED; | |
787 | if (ceph_security_xattr_wanted(dir)) | |
788 | mask |= CEPH_CAP_XATTR_SHARED; | |
789 | req->r_args.getattr.mask = cpu_to_le32(mask); | |
790 | ||
4c183472 | 791 | ihold(dir); |
3dd69aab JL |
792 | req->r_parent = dir; |
793 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); | |
2817b000 | 794 | err = ceph_mdsc_do_request(mdsc, NULL, req); |
7a971e2c JL |
795 | if (err == -ENOENT) { |
796 | struct dentry *res; | |
797 | ||
798 | res = ceph_handle_snapdir(req, dentry); | |
799 | if (IS_ERR(res)) { | |
800 | err = PTR_ERR(res); | |
801 | } else { | |
802 | dentry = res; | |
803 | err = 0; | |
804 | } | |
aa60cfc3 | 805 | } |
2817b000 SW |
806 | dentry = ceph_finish_lookup(req, dentry, err); |
807 | ceph_mdsc_put_request(req); /* will dput(dentry) */ | |
808 | dout("lookup result=%p\n", dentry); | |
809 | return dentry; | |
810 | } | |
811 | ||
812 | /* | |
813 | * If we do a create but get no trace back from the MDS, follow up with | |
814 | * a lookup (the VFS expects us to link up the provided dentry). | |
815 | */ | |
816 | int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry) | |
817 | { | |
00cd8dd3 | 818 | struct dentry *result = ceph_lookup(dir, dentry, 0); |
2817b000 SW |
819 | |
820 | if (result && !IS_ERR(result)) { | |
821 | /* | |
822 | * We created the item, then did a lookup, and found | |
823 | * it was already linked to another inode we already | |
4d41cef2 YZ |
824 | * had in our cache (and thus got spliced). To not |
825 | * confuse VFS (especially when inode is a directory), | |
826 | * we don't link our dentry to that inode, return an | |
827 | * error instead. | |
828 | * | |
829 | * This event should be rare and it happens only when | |
830 | * we talk to old MDS. Recent MDS does not send traceless | |
831 | * reply for request that creates new inode. | |
2817b000 | 832 | */ |
5cba372c | 833 | d_drop(result); |
4d41cef2 | 834 | return -ESTALE; |
2817b000 SW |
835 | } |
836 | return PTR_ERR(result); | |
837 | } | |
838 | ||
549c7297 CB |
839 | static int ceph_mknod(struct user_namespace *mnt_userns, struct inode *dir, |
840 | struct dentry *dentry, umode_t mode, dev_t rdev) | |
2817b000 | 841 | { |
2678da88 | 842 | struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); |
2817b000 | 843 | struct ceph_mds_request *req; |
5c31e92d | 844 | struct ceph_acl_sec_ctx as_ctx = {}; |
2817b000 SW |
845 | int err; |
846 | ||
847 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
848 | return -EROFS; | |
849 | ||
0459871c CX |
850 | if (ceph_quota_is_max_files_exceeded(dir)) { |
851 | err = -EDQUOT; | |
852 | goto out; | |
853 | } | |
b7a29217 | 854 | |
5c31e92d | 855 | err = ceph_pre_init_acls(dir, &mode, &as_ctx); |
ac6713cc YZ |
856 | if (err < 0) |
857 | goto out; | |
858 | err = ceph_security_init_secctx(dentry, mode, &as_ctx); | |
b1ee94aa | 859 | if (err < 0) |
0459871c | 860 | goto out; |
b1ee94aa | 861 | |
1a67aafb | 862 | dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n", |
2817b000 SW |
863 | dir, dentry, mode, rdev); |
864 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS); | |
865 | if (IS_ERR(req)) { | |
b1ee94aa YZ |
866 | err = PTR_ERR(req); |
867 | goto out; | |
2817b000 SW |
868 | } |
869 | req->r_dentry = dget(dentry); | |
870 | req->r_num_caps = 2; | |
3dd69aab | 871 | req->r_parent = dir; |
4c183472 | 872 | ihold(dir); |
3dd69aab | 873 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); |
2817b000 SW |
874 | req->r_args.mknod.mode = cpu_to_le32(mode); |
875 | req->r_args.mknod.rdev = cpu_to_le32(rdev); | |
222b7f90 | 876 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL; |
2817b000 | 877 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
5c31e92d YZ |
878 | if (as_ctx.pagelist) { |
879 | req->r_pagelist = as_ctx.pagelist; | |
880 | as_ctx.pagelist = NULL; | |
b1ee94aa | 881 | } |
2817b000 SW |
882 | err = ceph_mdsc_do_request(mdsc, dir, req); |
883 | if (!err && !req->r_reply_info.head->is_dentry) | |
884 | err = ceph_handle_notrace_create(dir, dentry); | |
885 | ceph_mdsc_put_request(req); | |
b1ee94aa | 886 | out: |
7221fe4c | 887 | if (!err) |
5c31e92d | 888 | ceph_init_inode_acls(d_inode(dentry), &as_ctx); |
b20a95a0 | 889 | else |
2817b000 | 890 | d_drop(dentry); |
5c31e92d | 891 | ceph_release_acl_sec_ctx(&as_ctx); |
2817b000 SW |
892 | return err; |
893 | } | |
894 | ||
549c7297 CB |
895 | static int ceph_create(struct user_namespace *mnt_userns, struct inode *dir, |
896 | struct dentry *dentry, umode_t mode, bool excl) | |
2817b000 | 897 | { |
549c7297 | 898 | return ceph_mknod(mnt_userns, dir, dentry, mode, 0); |
2817b000 SW |
899 | } |
900 | ||
549c7297 CB |
901 | static int ceph_symlink(struct user_namespace *mnt_userns, struct inode *dir, |
902 | struct dentry *dentry, const char *dest) | |
2817b000 | 903 | { |
2678da88 | 904 | struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); |
2817b000 | 905 | struct ceph_mds_request *req; |
ac6713cc | 906 | struct ceph_acl_sec_ctx as_ctx = {}; |
2817b000 SW |
907 | int err; |
908 | ||
909 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
910 | return -EROFS; | |
911 | ||
67fcd151 CX |
912 | if (ceph_quota_is_max_files_exceeded(dir)) { |
913 | err = -EDQUOT; | |
914 | goto out; | |
915 | } | |
b7a29217 | 916 | |
ac6713cc YZ |
917 | err = ceph_security_init_secctx(dentry, S_IFLNK | 0777, &as_ctx); |
918 | if (err < 0) | |
919 | goto out; | |
920 | ||
2817b000 SW |
921 | dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest); |
922 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS); | |
923 | if (IS_ERR(req)) { | |
b1ee94aa YZ |
924 | err = PTR_ERR(req); |
925 | goto out; | |
2817b000 | 926 | } |
687265e5 | 927 | req->r_path2 = kstrdup(dest, GFP_KERNEL); |
a149bb9a SK |
928 | if (!req->r_path2) { |
929 | err = -ENOMEM; | |
930 | ceph_mdsc_put_request(req); | |
931 | goto out; | |
932 | } | |
3dd69aab | 933 | req->r_parent = dir; |
4c183472 JL |
934 | ihold(dir); |
935 | ||
3dd69aab | 936 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); |
a149bb9a SK |
937 | req->r_dentry = dget(dentry); |
938 | req->r_num_caps = 2; | |
222b7f90 | 939 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL; |
2817b000 | 940 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
b748fc7a JL |
941 | if (as_ctx.pagelist) { |
942 | req->r_pagelist = as_ctx.pagelist; | |
943 | as_ctx.pagelist = NULL; | |
944 | } | |
2817b000 SW |
945 | err = ceph_mdsc_do_request(mdsc, dir, req); |
946 | if (!err && !req->r_reply_info.head->is_dentry) | |
947 | err = ceph_handle_notrace_create(dir, dentry); | |
948 | ceph_mdsc_put_request(req); | |
b1ee94aa YZ |
949 | out: |
950 | if (err) | |
2817b000 | 951 | d_drop(dentry); |
ac6713cc | 952 | ceph_release_acl_sec_ctx(&as_ctx); |
2817b000 SW |
953 | return err; |
954 | } | |
955 | ||
549c7297 CB |
956 | static int ceph_mkdir(struct user_namespace *mnt_userns, struct inode *dir, |
957 | struct dentry *dentry, umode_t mode) | |
2817b000 | 958 | { |
2678da88 | 959 | struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); |
2817b000 | 960 | struct ceph_mds_request *req; |
5c31e92d | 961 | struct ceph_acl_sec_ctx as_ctx = {}; |
2817b000 SW |
962 | int err = -EROFS; |
963 | int op; | |
964 | ||
965 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
966 | /* mkdir .snap/foo is a MKSNAP */ | |
967 | op = CEPH_MDS_OP_MKSNAP; | |
a455589f AV |
968 | dout("mksnap dir %p snap '%pd' dn %p\n", dir, |
969 | dentry, dentry); | |
2817b000 | 970 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { |
18bb1db3 | 971 | dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode); |
2817b000 SW |
972 | op = CEPH_MDS_OP_MKDIR; |
973 | } else { | |
974 | goto out; | |
975 | } | |
b1ee94aa | 976 | |
25963669 YZ |
977 | if (op == CEPH_MDS_OP_MKDIR && |
978 | ceph_quota_is_max_files_exceeded(dir)) { | |
b7a29217 LH |
979 | err = -EDQUOT; |
980 | goto out; | |
981 | } | |
982 | ||
b1ee94aa | 983 | mode |= S_IFDIR; |
5c31e92d | 984 | err = ceph_pre_init_acls(dir, &mode, &as_ctx); |
ac6713cc YZ |
985 | if (err < 0) |
986 | goto out; | |
987 | err = ceph_security_init_secctx(dentry, mode, &as_ctx); | |
b1ee94aa YZ |
988 | if (err < 0) |
989 | goto out; | |
990 | ||
2817b000 SW |
991 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); |
992 | if (IS_ERR(req)) { | |
993 | err = PTR_ERR(req); | |
994 | goto out; | |
995 | } | |
996 | ||
997 | req->r_dentry = dget(dentry); | |
998 | req->r_num_caps = 2; | |
3dd69aab | 999 | req->r_parent = dir; |
4c183472 | 1000 | ihold(dir); |
3dd69aab | 1001 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); |
2817b000 | 1002 | req->r_args.mkdir.mode = cpu_to_le32(mode); |
222b7f90 | 1003 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL; |
2817b000 | 1004 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
5c31e92d YZ |
1005 | if (as_ctx.pagelist) { |
1006 | req->r_pagelist = as_ctx.pagelist; | |
1007 | as_ctx.pagelist = NULL; | |
b1ee94aa | 1008 | } |
2817b000 | 1009 | err = ceph_mdsc_do_request(mdsc, dir, req); |
275dd19e YZ |
1010 | if (!err && |
1011 | !req->r_reply_info.head->is_target && | |
1012 | !req->r_reply_info.head->is_dentry) | |
2817b000 SW |
1013 | err = ceph_handle_notrace_create(dir, dentry); |
1014 | ceph_mdsc_put_request(req); | |
1015 | out: | |
b20a95a0 | 1016 | if (!err) |
5c31e92d | 1017 | ceph_init_inode_acls(d_inode(dentry), &as_ctx); |
b20a95a0 | 1018 | else |
2817b000 | 1019 | d_drop(dentry); |
5c31e92d | 1020 | ceph_release_acl_sec_ctx(&as_ctx); |
2817b000 SW |
1021 | return err; |
1022 | } | |
1023 | ||
1024 | static int ceph_link(struct dentry *old_dentry, struct inode *dir, | |
1025 | struct dentry *dentry) | |
1026 | { | |
2678da88 | 1027 | struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); |
2817b000 SW |
1028 | struct ceph_mds_request *req; |
1029 | int err; | |
1030 | ||
1031 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
1032 | return -EROFS; | |
1033 | ||
1034 | dout("link in dir %p old_dentry %p dentry %p\n", dir, | |
1035 | old_dentry, dentry); | |
1036 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS); | |
1037 | if (IS_ERR(req)) { | |
1038 | d_drop(dentry); | |
1039 | return PTR_ERR(req); | |
1040 | } | |
1041 | req->r_dentry = dget(dentry); | |
1042 | req->r_num_caps = 2; | |
4b58c9b1 | 1043 | req->r_old_dentry = dget(old_dentry); |
3dd69aab | 1044 | req->r_parent = dir; |
4c183472 | 1045 | ihold(dir); |
3dd69aab | 1046 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); |
2817b000 SW |
1047 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; |
1048 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
ad88f23f | 1049 | /* release LINK_SHARED on source inode (mds will lock it) */ |
d19a0b54 | 1050 | req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; |
2817b000 | 1051 | err = ceph_mdsc_do_request(mdsc, dir, req); |
70b666c3 | 1052 | if (err) { |
2817b000 | 1053 | d_drop(dentry); |
70b666c3 | 1054 | } else if (!req->r_reply_info.head->is_dentry) { |
2b0143b5 DH |
1055 | ihold(d_inode(old_dentry)); |
1056 | d_instantiate(dentry, d_inode(old_dentry)); | |
70b666c3 | 1057 | } |
2817b000 SW |
1058 | ceph_mdsc_put_request(req); |
1059 | return err; | |
1060 | } | |
1061 | ||
2ccb4546 JL |
1062 | static void ceph_async_unlink_cb(struct ceph_mds_client *mdsc, |
1063 | struct ceph_mds_request *req) | |
1064 | { | |
1065 | int result = req->r_err ? req->r_err : | |
1066 | le32_to_cpu(req->r_reply_info.head->result); | |
1067 | ||
1068 | if (result == -EJUKEBOX) | |
1069 | goto out; | |
1070 | ||
1071 | /* If op failed, mark everyone involved for errors */ | |
1072 | if (result) { | |
2a575f13 JL |
1073 | int pathlen = 0; |
1074 | u64 base = 0; | |
2ccb4546 JL |
1075 | char *path = ceph_mdsc_build_path(req->r_dentry, &pathlen, |
1076 | &base, 0); | |
1077 | ||
1078 | /* mark error on parent + clear complete */ | |
1079 | mapping_set_error(req->r_parent->i_mapping, result); | |
1080 | ceph_dir_clear_complete(req->r_parent); | |
1081 | ||
1082 | /* drop the dentry -- we don't know its status */ | |
1083 | if (!d_unhashed(req->r_dentry)) | |
1084 | d_drop(req->r_dentry); | |
1085 | ||
1086 | /* mark inode itself for an error (since metadata is bogus) */ | |
1087 | mapping_set_error(req->r_old_inode->i_mapping, result); | |
1088 | ||
1089 | pr_warn("ceph: async unlink failure path=(%llx)%s result=%d!\n", | |
1090 | base, IS_ERR(path) ? "<<bad>>" : path, result); | |
1091 | ceph_mdsc_free_path(path, pathlen); | |
1092 | } | |
1093 | out: | |
1094 | iput(req->r_old_inode); | |
1095 | ceph_mdsc_release_dir_caps(req); | |
1096 | } | |
1097 | ||
1098 | static int get_caps_for_async_unlink(struct inode *dir, struct dentry *dentry) | |
1099 | { | |
1100 | struct ceph_inode_info *ci = ceph_inode(dir); | |
1101 | struct ceph_dentry_info *di; | |
1102 | int got = 0, want = CEPH_CAP_FILE_EXCL | CEPH_CAP_DIR_UNLINK; | |
1103 | ||
1104 | spin_lock(&ci->i_ceph_lock); | |
1105 | if ((__ceph_caps_issued(ci, NULL) & want) == want) { | |
1106 | ceph_take_cap_refs(ci, want, false); | |
1107 | got = want; | |
1108 | } | |
1109 | spin_unlock(&ci->i_ceph_lock); | |
1110 | ||
1111 | /* If we didn't get anything, return 0 */ | |
1112 | if (!got) | |
1113 | return 0; | |
1114 | ||
1115 | spin_lock(&dentry->d_lock); | |
1116 | di = ceph_dentry(dentry); | |
1117 | /* | |
1118 | * - We are holding Fx, which implies Fs caps. | |
1119 | * - Only support async unlink for primary linkage | |
1120 | */ | |
1121 | if (atomic_read(&ci->i_shared_gen) != di->lease_shared_gen || | |
1122 | !(di->flags & CEPH_DENTRY_PRIMARY_LINK)) | |
1123 | want = 0; | |
1124 | spin_unlock(&dentry->d_lock); | |
1125 | ||
1126 | /* Do we still want what we've got? */ | |
1127 | if (want == got) | |
1128 | return got; | |
1129 | ||
1130 | ceph_put_cap_refs(ci, got); | |
1131 | return 0; | |
1132 | } | |
1133 | ||
2817b000 SW |
1134 | /* |
1135 | * rmdir and unlink are differ only by the metadata op code | |
1136 | */ | |
1137 | static int ceph_unlink(struct inode *dir, struct dentry *dentry) | |
1138 | { | |
3d14c5d2 YS |
1139 | struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
1140 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
2b0143b5 | 1141 | struct inode *inode = d_inode(dentry); |
2817b000 | 1142 | struct ceph_mds_request *req; |
2ccb4546 | 1143 | bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS); |
2817b000 SW |
1144 | int err = -EROFS; |
1145 | int op; | |
1146 | ||
1147 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
1148 | /* rmdir .snap/foo is RMSNAP */ | |
a455589f | 1149 | dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry); |
2817b000 SW |
1150 | op = CEPH_MDS_OP_RMSNAP; |
1151 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { | |
1152 | dout("unlink/rmdir dir %p dn %p inode %p\n", | |
1153 | dir, dentry, inode); | |
e36cb0b8 | 1154 | op = d_is_dir(dentry) ? |
2817b000 SW |
1155 | CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK; |
1156 | } else | |
1157 | goto out; | |
2ccb4546 | 1158 | retry: |
2817b000 SW |
1159 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); |
1160 | if (IS_ERR(req)) { | |
1161 | err = PTR_ERR(req); | |
1162 | goto out; | |
1163 | } | |
1164 | req->r_dentry = dget(dentry); | |
1165 | req->r_num_caps = 2; | |
3dd69aab | 1166 | req->r_parent = dir; |
4c183472 | 1167 | ihold(dir); |
2817b000 SW |
1168 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; |
1169 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
6ef0bc6d | 1170 | req->r_inode_drop = ceph_drop_caps_for_unlink(inode); |
2ccb4546 JL |
1171 | |
1172 | if (try_async && op == CEPH_MDS_OP_UNLINK && | |
1173 | (req->r_dir_caps = get_caps_for_async_unlink(dir, dentry))) { | |
ebce3eb2 | 1174 | dout("async unlink on %llu/%.*s caps=%s", ceph_ino(dir), |
2ccb4546 JL |
1175 | dentry->d_name.len, dentry->d_name.name, |
1176 | ceph_cap_string(req->r_dir_caps)); | |
1177 | set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags); | |
1178 | req->r_callback = ceph_async_unlink_cb; | |
1179 | req->r_old_inode = d_inode(dentry); | |
1180 | ihold(req->r_old_inode); | |
1181 | err = ceph_mdsc_submit_request(mdsc, dir, req); | |
1182 | if (!err) { | |
1183 | /* | |
1184 | * We have enough caps, so we assume that the unlink | |
1185 | * will succeed. Fix up the target inode and dcache. | |
1186 | */ | |
1187 | drop_nlink(inode); | |
1188 | d_delete(dentry); | |
1189 | } else if (err == -EJUKEBOX) { | |
1190 | try_async = false; | |
1191 | ceph_mdsc_put_request(req); | |
1192 | goto retry; | |
1193 | } | |
1194 | } else { | |
1195 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); | |
1196 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
1197 | if (!err && !req->r_reply_info.head->is_dentry) | |
1198 | d_delete(dentry); | |
1199 | } | |
1200 | ||
2817b000 SW |
1201 | ceph_mdsc_put_request(req); |
1202 | out: | |
1203 | return err; | |
1204 | } | |
1205 | ||
549c7297 CB |
1206 | static int ceph_rename(struct user_namespace *mnt_userns, struct inode *old_dir, |
1207 | struct dentry *old_dentry, struct inode *new_dir, | |
1208 | struct dentry *new_dentry, unsigned int flags) | |
2817b000 | 1209 | { |
2678da88 | 1210 | struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(old_dir->i_sb); |
2817b000 | 1211 | struct ceph_mds_request *req; |
0ea611a3 | 1212 | int op = CEPH_MDS_OP_RENAME; |
2817b000 SW |
1213 | int err; |
1214 | ||
1cd66c93 MS |
1215 | if (flags) |
1216 | return -EINVAL; | |
1217 | ||
2817b000 SW |
1218 | if (ceph_snap(old_dir) != ceph_snap(new_dir)) |
1219 | return -EXDEV; | |
0ea611a3 YZ |
1220 | if (ceph_snap(old_dir) != CEPH_NOSNAP) { |
1221 | if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR) | |
1222 | op = CEPH_MDS_OP_RENAMESNAP; | |
1223 | else | |
1224 | return -EROFS; | |
1225 | } | |
6646ea1c LH |
1226 | /* don't allow cross-quota renames */ |
1227 | if ((old_dir != new_dir) && | |
1228 | (!ceph_quota_is_same_realm(old_dir, new_dir))) | |
1229 | return -EXDEV; | |
cafe21a4 | 1230 | |
2817b000 SW |
1231 | dout("rename dir %p dentry %p to dir %p dentry %p\n", |
1232 | old_dir, old_dentry, new_dir, new_dentry); | |
0ea611a3 | 1233 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); |
2817b000 SW |
1234 | if (IS_ERR(req)) |
1235 | return PTR_ERR(req); | |
180061a5 | 1236 | ihold(old_dir); |
2817b000 SW |
1237 | req->r_dentry = dget(new_dentry); |
1238 | req->r_num_caps = 2; | |
1239 | req->r_old_dentry = dget(old_dentry); | |
180061a5 | 1240 | req->r_old_dentry_dir = old_dir; |
3dd69aab | 1241 | req->r_parent = new_dir; |
4c183472 | 1242 | ihold(new_dir); |
3dd69aab | 1243 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); |
2817b000 SW |
1244 | req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED; |
1245 | req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL; | |
1246 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED; | |
1247 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; | |
1248 | /* release LINK_RDCACHE on source inode (mds will lock it) */ | |
d19a0b54 | 1249 | req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; |
6ef0bc6d ZZ |
1250 | if (d_really_is_positive(new_dentry)) { |
1251 | req->r_inode_drop = | |
1252 | ceph_drop_caps_for_unlink(d_inode(new_dentry)); | |
1253 | } | |
2817b000 SW |
1254 | err = ceph_mdsc_do_request(mdsc, old_dir, req); |
1255 | if (!err && !req->r_reply_info.head->is_dentry) { | |
1256 | /* | |
1257 | * Normally d_move() is done by fill_trace (called by | |
1258 | * do_request, above). If there is no trace, we need | |
1259 | * to do it here. | |
1260 | */ | |
1261 | d_move(old_dentry, new_dentry); | |
1262 | } | |
1263 | ceph_mdsc_put_request(req); | |
1264 | return err; | |
1265 | } | |
1266 | ||
37c4efc1 YZ |
1267 | /* |
1268 | * Move dentry to tail of mdsc->dentry_leases list when lease is updated. | |
1269 | * Leases at front of the list will expire first. (Assume all leases have | |
1270 | * similar duration) | |
1271 | * | |
1272 | * Called under dentry->d_lock. | |
1273 | */ | |
1274 | void __ceph_dentry_lease_touch(struct ceph_dentry_info *di) | |
1275 | { | |
1276 | struct dentry *dn = di->dentry; | |
1277 | struct ceph_mds_client *mdsc; | |
1278 | ||
1279 | dout("dentry_lease_touch %p %p '%pd'\n", di, dn, dn); | |
1280 | ||
1281 | di->flags |= CEPH_DENTRY_LEASE_LIST; | |
1282 | if (di->flags & CEPH_DENTRY_SHRINK_LIST) { | |
1283 | di->flags |= CEPH_DENTRY_REFERENCED; | |
1284 | return; | |
1285 | } | |
1286 | ||
1287 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; | |
1288 | spin_lock(&mdsc->dentry_list_lock); | |
1289 | list_move_tail(&di->lease_list, &mdsc->dentry_leases); | |
1290 | spin_unlock(&mdsc->dentry_list_lock); | |
1291 | } | |
1292 | ||
1293 | static void __dentry_dir_lease_touch(struct ceph_mds_client* mdsc, | |
1294 | struct ceph_dentry_info *di) | |
1295 | { | |
1296 | di->flags &= ~(CEPH_DENTRY_LEASE_LIST | CEPH_DENTRY_REFERENCED); | |
1297 | di->lease_gen = 0; | |
1298 | di->time = jiffies; | |
1299 | list_move_tail(&di->lease_list, &mdsc->dentry_dir_leases); | |
1300 | } | |
1301 | ||
1302 | /* | |
1303 | * When dir lease is used, add dentry to tail of mdsc->dentry_dir_leases | |
1304 | * list if it's not in the list, otherwise set 'referenced' flag. | |
1305 | * | |
1306 | * Called under dentry->d_lock. | |
1307 | */ | |
1308 | void __ceph_dentry_dir_lease_touch(struct ceph_dentry_info *di) | |
1309 | { | |
1310 | struct dentry *dn = di->dentry; | |
1311 | struct ceph_mds_client *mdsc; | |
1312 | ||
0eb30853 | 1313 | dout("dentry_dir_lease_touch %p %p '%pd' (offset 0x%llx)\n", |
37c4efc1 YZ |
1314 | di, dn, dn, di->offset); |
1315 | ||
1316 | if (!list_empty(&di->lease_list)) { | |
1317 | if (di->flags & CEPH_DENTRY_LEASE_LIST) { | |
1318 | /* don't remove dentry from dentry lease list | |
1319 | * if its lease is valid */ | |
1320 | if (__dentry_lease_is_valid(di)) | |
1321 | return; | |
1322 | } else { | |
1323 | di->flags |= CEPH_DENTRY_REFERENCED; | |
1324 | return; | |
1325 | } | |
1326 | } | |
1327 | ||
1328 | if (di->flags & CEPH_DENTRY_SHRINK_LIST) { | |
1329 | di->flags |= CEPH_DENTRY_REFERENCED; | |
1330 | di->flags &= ~CEPH_DENTRY_LEASE_LIST; | |
1331 | return; | |
1332 | } | |
1333 | ||
1334 | mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; | |
1335 | spin_lock(&mdsc->dentry_list_lock); | |
1336 | __dentry_dir_lease_touch(mdsc, di), | |
1337 | spin_unlock(&mdsc->dentry_list_lock); | |
1338 | } | |
1339 | ||
1340 | static void __dentry_lease_unlist(struct ceph_dentry_info *di) | |
1341 | { | |
1342 | struct ceph_mds_client *mdsc; | |
1343 | if (di->flags & CEPH_DENTRY_SHRINK_LIST) | |
1344 | return; | |
1345 | if (list_empty(&di->lease_list)) | |
1346 | return; | |
1347 | ||
1348 | mdsc = ceph_sb_to_client(di->dentry->d_sb)->mdsc; | |
1349 | spin_lock(&mdsc->dentry_list_lock); | |
1350 | list_del_init(&di->lease_list); | |
1351 | spin_unlock(&mdsc->dentry_list_lock); | |
1352 | } | |
1353 | ||
1354 | enum { | |
1355 | KEEP = 0, | |
1356 | DELETE = 1, | |
1357 | TOUCH = 2, | |
1358 | STOP = 4, | |
1359 | }; | |
1360 | ||
1361 | struct ceph_lease_walk_control { | |
1362 | bool dir_lease; | |
fe33032d | 1363 | bool expire_dir_lease; |
37c4efc1 YZ |
1364 | unsigned long nr_to_scan; |
1365 | unsigned long dir_lease_ttl; | |
1366 | }; | |
1367 | ||
1368 | static unsigned long | |
1369 | __dentry_leases_walk(struct ceph_mds_client *mdsc, | |
1370 | struct ceph_lease_walk_control *lwc, | |
1371 | int (*check)(struct dentry*, void*)) | |
1372 | { | |
1373 | struct ceph_dentry_info *di, *tmp; | |
1374 | struct dentry *dentry, *last = NULL; | |
1375 | struct list_head* list; | |
1376 | LIST_HEAD(dispose); | |
1377 | unsigned long freed = 0; | |
1378 | int ret = 0; | |
1379 | ||
1380 | list = lwc->dir_lease ? &mdsc->dentry_dir_leases : &mdsc->dentry_leases; | |
1381 | spin_lock(&mdsc->dentry_list_lock); | |
1382 | list_for_each_entry_safe(di, tmp, list, lease_list) { | |
1383 | if (!lwc->nr_to_scan) | |
1384 | break; | |
1385 | --lwc->nr_to_scan; | |
1386 | ||
1387 | dentry = di->dentry; | |
1388 | if (last == dentry) | |
1389 | break; | |
1390 | ||
1391 | if (!spin_trylock(&dentry->d_lock)) | |
1392 | continue; | |
1393 | ||
516162b9 | 1394 | if (__lockref_is_dead(&dentry->d_lockref)) { |
37c4efc1 YZ |
1395 | list_del_init(&di->lease_list); |
1396 | goto next; | |
1397 | } | |
1398 | ||
1399 | ret = check(dentry, lwc); | |
1400 | if (ret & TOUCH) { | |
1401 | /* move it into tail of dir lease list */ | |
1402 | __dentry_dir_lease_touch(mdsc, di); | |
1403 | if (!last) | |
1404 | last = dentry; | |
1405 | } | |
1406 | if (ret & DELETE) { | |
1407 | /* stale lease */ | |
1408 | di->flags &= ~CEPH_DENTRY_REFERENCED; | |
1409 | if (dentry->d_lockref.count > 0) { | |
1410 | /* update_dentry_lease() will re-add | |
1411 | * it to lease list, or | |
1412 | * ceph_d_delete() will return 1 when | |
1413 | * last reference is dropped */ | |
1414 | list_del_init(&di->lease_list); | |
1415 | } else { | |
1416 | di->flags |= CEPH_DENTRY_SHRINK_LIST; | |
1417 | list_move_tail(&di->lease_list, &dispose); | |
1418 | dget_dlock(dentry); | |
1419 | } | |
1420 | } | |
1421 | next: | |
1422 | spin_unlock(&dentry->d_lock); | |
1423 | if (ret & STOP) | |
1424 | break; | |
1425 | } | |
1426 | spin_unlock(&mdsc->dentry_list_lock); | |
1427 | ||
1428 | while (!list_empty(&dispose)) { | |
1429 | di = list_first_entry(&dispose, struct ceph_dentry_info, | |
1430 | lease_list); | |
1431 | dentry = di->dentry; | |
1432 | spin_lock(&dentry->d_lock); | |
1433 | ||
1434 | list_del_init(&di->lease_list); | |
1435 | di->flags &= ~CEPH_DENTRY_SHRINK_LIST; | |
1436 | if (di->flags & CEPH_DENTRY_REFERENCED) { | |
1437 | spin_lock(&mdsc->dentry_list_lock); | |
1438 | if (di->flags & CEPH_DENTRY_LEASE_LIST) { | |
1439 | list_add_tail(&di->lease_list, | |
1440 | &mdsc->dentry_leases); | |
1441 | } else { | |
1442 | __dentry_dir_lease_touch(mdsc, di); | |
1443 | } | |
1444 | spin_unlock(&mdsc->dentry_list_lock); | |
1445 | } else { | |
1446 | freed++; | |
1447 | } | |
1448 | ||
1449 | spin_unlock(&dentry->d_lock); | |
1450 | /* ceph_d_delete() does the trick */ | |
1451 | dput(dentry); | |
1452 | } | |
1453 | return freed; | |
1454 | } | |
1455 | ||
1456 | static int __dentry_lease_check(struct dentry *dentry, void *arg) | |
1457 | { | |
1458 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
1459 | int ret; | |
1460 | ||
1461 | if (__dentry_lease_is_valid(di)) | |
1462 | return STOP; | |
1463 | ret = __dir_lease_try_check(dentry); | |
1464 | if (ret == -EBUSY) | |
1465 | return KEEP; | |
1466 | if (ret > 0) | |
1467 | return TOUCH; | |
1468 | return DELETE; | |
1469 | } | |
1470 | ||
1471 | static int __dir_lease_check(struct dentry *dentry, void *arg) | |
1472 | { | |
1473 | struct ceph_lease_walk_control *lwc = arg; | |
1474 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
1475 | ||
1476 | int ret = __dir_lease_try_check(dentry); | |
1477 | if (ret == -EBUSY) | |
1478 | return KEEP; | |
1479 | if (ret > 0) { | |
1480 | if (time_before(jiffies, di->time + lwc->dir_lease_ttl)) | |
1481 | return STOP; | |
1482 | /* Move dentry to tail of dir lease list if we don't want | |
1483 | * to delete it. So dentries in the list are checked in a | |
1484 | * round robin manner */ | |
fe33032d YZ |
1485 | if (!lwc->expire_dir_lease) |
1486 | return TOUCH; | |
1487 | if (dentry->d_lockref.count > 0 || | |
1488 | (di->flags & CEPH_DENTRY_REFERENCED)) | |
1489 | return TOUCH; | |
1490 | /* invalidate dir lease */ | |
1491 | di->lease_shared_gen = 0; | |
37c4efc1 YZ |
1492 | } |
1493 | return DELETE; | |
1494 | } | |
1495 | ||
1496 | int ceph_trim_dentries(struct ceph_mds_client *mdsc) | |
1497 | { | |
1498 | struct ceph_lease_walk_control lwc; | |
fe33032d | 1499 | unsigned long count; |
37c4efc1 YZ |
1500 | unsigned long freed; |
1501 | ||
fe33032d YZ |
1502 | spin_lock(&mdsc->caps_list_lock); |
1503 | if (mdsc->caps_use_max > 0 && | |
1504 | mdsc->caps_use_count > mdsc->caps_use_max) | |
1505 | count = mdsc->caps_use_count - mdsc->caps_use_max; | |
1506 | else | |
1507 | count = 0; | |
1508 | spin_unlock(&mdsc->caps_list_lock); | |
1509 | ||
37c4efc1 YZ |
1510 | lwc.dir_lease = false; |
1511 | lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE * 2; | |
1512 | freed = __dentry_leases_walk(mdsc, &lwc, __dentry_lease_check); | |
1513 | if (!lwc.nr_to_scan) /* more invalid leases */ | |
1514 | return -EAGAIN; | |
1515 | ||
1516 | if (lwc.nr_to_scan < CEPH_CAPS_PER_RELEASE) | |
1517 | lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE; | |
1518 | ||
1519 | lwc.dir_lease = true; | |
fe33032d YZ |
1520 | lwc.expire_dir_lease = freed < count; |
1521 | lwc.dir_lease_ttl = mdsc->fsc->mount_options->caps_wanted_delay_max * HZ; | |
37c4efc1 YZ |
1522 | freed +=__dentry_leases_walk(mdsc, &lwc, __dir_lease_check); |
1523 | if (!lwc.nr_to_scan) /* more to check */ | |
1524 | return -EAGAIN; | |
1525 | ||
1526 | return freed > 0 ? 1 : 0; | |
1527 | } | |
1528 | ||
81a6cf2d SW |
1529 | /* |
1530 | * Ensure a dentry lease will no longer revalidate. | |
1531 | */ | |
1532 | void ceph_invalidate_dentry_lease(struct dentry *dentry) | |
1533 | { | |
37c4efc1 | 1534 | struct ceph_dentry_info *di = ceph_dentry(dentry); |
81a6cf2d | 1535 | spin_lock(&dentry->d_lock); |
37c4efc1 YZ |
1536 | di->time = jiffies; |
1537 | di->lease_shared_gen = 0; | |
f5e17aed | 1538 | di->flags &= ~CEPH_DENTRY_PRIMARY_LINK; |
37c4efc1 | 1539 | __dentry_lease_unlist(di); |
81a6cf2d SW |
1540 | spin_unlock(&dentry->d_lock); |
1541 | } | |
2817b000 SW |
1542 | |
1543 | /* | |
1544 | * Check if dentry lease is valid. If not, delete the lease. Try to | |
1545 | * renew if the least is more than half up. | |
1546 | */ | |
1e9c2eb6 YZ |
1547 | static bool __dentry_lease_is_valid(struct ceph_dentry_info *di) |
1548 | { | |
1549 | struct ceph_mds_session *session; | |
1550 | ||
1551 | if (!di->lease_gen) | |
1552 | return false; | |
1553 | ||
1554 | session = di->lease_session; | |
1555 | if (session) { | |
1556 | u32 gen; | |
1557 | unsigned long ttl; | |
1558 | ||
52d60f8e | 1559 | gen = atomic_read(&session->s_cap_gen); |
1e9c2eb6 | 1560 | ttl = session->s_cap_ttl; |
1e9c2eb6 YZ |
1561 | |
1562 | if (di->lease_gen == gen && | |
1563 | time_before(jiffies, ttl) && | |
1564 | time_before(jiffies, di->time)) | |
1565 | return true; | |
1566 | } | |
1567 | di->lease_gen = 0; | |
1568 | return false; | |
1569 | } | |
1570 | ||
8f2a98ef | 1571 | static int dentry_lease_is_valid(struct dentry *dentry, unsigned int flags) |
2817b000 SW |
1572 | { |
1573 | struct ceph_dentry_info *di; | |
2817b000 | 1574 | struct ceph_mds_session *session = NULL; |
2817b000 | 1575 | u32 seq = 0; |
1e9c2eb6 | 1576 | int valid = 0; |
2817b000 SW |
1577 | |
1578 | spin_lock(&dentry->d_lock); | |
1579 | di = ceph_dentry(dentry); | |
1e9c2eb6 YZ |
1580 | if (di && __dentry_lease_is_valid(di)) { |
1581 | valid = 1; | |
2817b000 | 1582 | |
1e9c2eb6 YZ |
1583 | if (di->lease_renew_after && |
1584 | time_after(jiffies, di->lease_renew_after)) { | |
1585 | /* | |
1586 | * We should renew. If we're in RCU walk mode | |
1587 | * though, we can't do that so just return | |
1588 | * -ECHILD. | |
1589 | */ | |
1590 | if (flags & LOOKUP_RCU) { | |
1591 | valid = -ECHILD; | |
1592 | } else { | |
1593 | session = ceph_get_mds_session(di->lease_session); | |
1594 | seq = di->lease_seq; | |
1595 | di->lease_renew_after = 0; | |
1596 | di->lease_renew_from = jiffies; | |
2817b000 | 1597 | } |
2817b000 SW |
1598 | } |
1599 | } | |
1600 | spin_unlock(&dentry->d_lock); | |
1601 | ||
1602 | if (session) { | |
8f2a98ef | 1603 | ceph_mdsc_lease_send_msg(session, dentry, |
2817b000 SW |
1604 | CEPH_MDS_LEASE_RENEW, seq); |
1605 | ceph_put_mds_session(session); | |
1606 | } | |
1607 | dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid); | |
1608 | return valid; | |
1609 | } | |
1610 | ||
1e9c2eb6 YZ |
1611 | /* |
1612 | * Called under dentry->d_lock. | |
1613 | */ | |
1614 | static int __dir_lease_try_check(const struct dentry *dentry) | |
1615 | { | |
1616 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
1617 | struct inode *dir; | |
1618 | struct ceph_inode_info *ci; | |
1619 | int valid = 0; | |
1620 | ||
1621 | if (!di->lease_shared_gen) | |
1622 | return 0; | |
1623 | if (IS_ROOT(dentry)) | |
1624 | return 0; | |
1625 | ||
1626 | dir = d_inode(dentry->d_parent); | |
1627 | ci = ceph_inode(dir); | |
1628 | ||
1629 | if (spin_trylock(&ci->i_ceph_lock)) { | |
1630 | if (atomic_read(&ci->i_shared_gen) == di->lease_shared_gen && | |
1631 | __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 0)) | |
1632 | valid = 1; | |
1633 | spin_unlock(&ci->i_ceph_lock); | |
1634 | } else { | |
1635 | valid = -EBUSY; | |
1636 | } | |
1637 | ||
1638 | if (!valid) | |
1639 | di->lease_shared_gen = 0; | |
1640 | return valid; | |
1641 | } | |
1642 | ||
2817b000 SW |
1643 | /* |
1644 | * Check if directory-wide content lease/cap is valid. | |
1645 | */ | |
719a2514 YZ |
1646 | static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry, |
1647 | struct ceph_mds_client *mdsc) | |
2817b000 SW |
1648 | { |
1649 | struct ceph_inode_info *ci = ceph_inode(dir); | |
feab6ac2 YZ |
1650 | int valid; |
1651 | int shared_gen; | |
2817b000 | 1652 | |
be655596 | 1653 | spin_lock(&ci->i_ceph_lock); |
feab6ac2 | 1654 | valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1); |
719a2514 YZ |
1655 | if (valid) { |
1656 | __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_RD); | |
1657 | shared_gen = atomic_read(&ci->i_shared_gen); | |
1658 | } | |
be655596 | 1659 | spin_unlock(&ci->i_ceph_lock); |
feab6ac2 YZ |
1660 | if (valid) { |
1661 | struct ceph_dentry_info *di; | |
1662 | spin_lock(&dentry->d_lock); | |
1663 | di = ceph_dentry(dentry); | |
1664 | if (dir == d_inode(dentry->d_parent) && | |
1665 | di && di->lease_shared_gen == shared_gen) | |
1666 | __ceph_dentry_dir_lease_touch(di); | |
1667 | else | |
1668 | valid = 0; | |
1669 | spin_unlock(&dentry->d_lock); | |
1670 | } | |
1671 | dout("dir_lease_is_valid dir %p v%u dentry %p = %d\n", | |
1672 | dir, (unsigned)atomic_read(&ci->i_shared_gen), dentry, valid); | |
2817b000 SW |
1673 | return valid; |
1674 | } | |
1675 | ||
1676 | /* | |
1677 | * Check if cached dentry can be trusted. | |
1678 | */ | |
0b728e19 | 1679 | static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags) |
2817b000 | 1680 | { |
bf1c6aca | 1681 | int valid = 0; |
641235d8 | 1682 | struct dentry *parent; |
aa8dd816 | 1683 | struct inode *dir, *inode; |
719a2514 | 1684 | struct ceph_mds_client *mdsc; |
34286d66 | 1685 | |
f49d1e05 | 1686 | if (flags & LOOKUP_RCU) { |
52953d55 | 1687 | parent = READ_ONCE(dentry->d_parent); |
f49d1e05 JL |
1688 | dir = d_inode_rcu(parent); |
1689 | if (!dir) | |
1690 | return -ECHILD; | |
aa8dd816 | 1691 | inode = d_inode_rcu(dentry); |
f49d1e05 JL |
1692 | } else { |
1693 | parent = dget_parent(dentry); | |
1694 | dir = d_inode(parent); | |
aa8dd816 | 1695 | inode = d_inode(dentry); |
f49d1e05 | 1696 | } |
34286d66 | 1697 | |
0eb30853 | 1698 | dout("d_revalidate %p '%pd' inode %p offset 0x%llx\n", dentry, |
aa8dd816 | 1699 | dentry, inode, ceph_dentry(dentry)->offset); |
2817b000 | 1700 | |
719a2514 YZ |
1701 | mdsc = ceph_sb_to_client(dir->i_sb)->mdsc; |
1702 | ||
2817b000 SW |
1703 | /* always trust cached snapped dentries, snapdir dentry */ |
1704 | if (ceph_snap(dir) != CEPH_NOSNAP) { | |
a455589f | 1705 | dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry, |
aa8dd816 | 1706 | dentry, inode); |
bf1c6aca | 1707 | valid = 1; |
aa8dd816 | 1708 | } else if (inode && ceph_snap(inode) == CEPH_SNAPDIR) { |
bf1c6aca | 1709 | valid = 1; |
14fb9c9e | 1710 | } else { |
8f2a98ef | 1711 | valid = dentry_lease_is_valid(dentry, flags); |
14fb9c9e JL |
1712 | if (valid == -ECHILD) |
1713 | return valid; | |
719a2514 | 1714 | if (valid || dir_lease_is_valid(dir, dentry, mdsc)) { |
aa8dd816 AV |
1715 | if (inode) |
1716 | valid = ceph_is_any_caps(inode); | |
14fb9c9e JL |
1717 | else |
1718 | valid = 1; | |
1719 | } | |
2817b000 | 1720 | } |
2817b000 | 1721 | |
200fd27c | 1722 | if (!valid) { |
200fd27c | 1723 | struct ceph_mds_request *req; |
1097680d JL |
1724 | int op, err; |
1725 | u32 mask; | |
200fd27c | 1726 | |
f49d1e05 JL |
1727 | if (flags & LOOKUP_RCU) |
1728 | return -ECHILD; | |
1729 | ||
f9009efa XL |
1730 | percpu_counter_inc(&mdsc->metric.d_lease_mis); |
1731 | ||
200fd27c | 1732 | op = ceph_snap(dir) == CEPH_SNAPDIR ? |
5eb9f604 | 1733 | CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; |
200fd27c YZ |
1734 | req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); |
1735 | if (!IS_ERR(req)) { | |
1736 | req->r_dentry = dget(dentry); | |
5eb9f604 JL |
1737 | req->r_num_caps = 2; |
1738 | req->r_parent = dir; | |
4c183472 | 1739 | ihold(dir); |
200fd27c YZ |
1740 | |
1741 | mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED; | |
1742 | if (ceph_security_xattr_wanted(dir)) | |
1743 | mask |= CEPH_CAP_XATTR_SHARED; | |
1097680d | 1744 | req->r_args.getattr.mask = cpu_to_le32(mask); |
200fd27c | 1745 | |
200fd27c | 1746 | err = ceph_mdsc_do_request(mdsc, NULL, req); |
c3f4688a JL |
1747 | switch (err) { |
1748 | case 0: | |
1749 | if (d_really_is_positive(dentry) && | |
1750 | d_inode(dentry) == req->r_target_inode) | |
1751 | valid = 1; | |
1752 | break; | |
1753 | case -ENOENT: | |
1754 | if (d_really_is_negative(dentry)) | |
1755 | valid = 1; | |
df561f66 | 1756 | fallthrough; |
c3f4688a JL |
1757 | default: |
1758 | break; | |
200fd27c YZ |
1759 | } |
1760 | ceph_mdsc_put_request(req); | |
1761 | dout("d_revalidate %p lookup result=%d\n", | |
1762 | dentry, err); | |
1763 | } | |
f9009efa XL |
1764 | } else { |
1765 | percpu_counter_inc(&mdsc->metric.d_lease_hit); | |
200fd27c YZ |
1766 | } |
1767 | ||
bf1c6aca | 1768 | dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid"); |
37c4efc1 | 1769 | if (!valid) |
9215aeea | 1770 | ceph_dir_clear_complete(dir); |
641235d8 | 1771 | |
f49d1e05 JL |
1772 | if (!(flags & LOOKUP_RCU)) |
1773 | dput(parent); | |
bf1c6aca | 1774 | return valid; |
2817b000 SW |
1775 | } |
1776 | ||
1e9c2eb6 YZ |
1777 | /* |
1778 | * Delete unused dentry that doesn't have valid lease | |
1779 | * | |
1780 | * Called under dentry->d_lock. | |
1781 | */ | |
1782 | static int ceph_d_delete(const struct dentry *dentry) | |
1783 | { | |
1784 | struct ceph_dentry_info *di; | |
1785 | ||
1786 | /* won't release caps */ | |
1787 | if (d_really_is_negative(dentry)) | |
1788 | return 0; | |
1789 | if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP) | |
1790 | return 0; | |
1791 | /* vaild lease? */ | |
1792 | di = ceph_dentry(dentry); | |
1793 | if (di) { | |
1794 | if (__dentry_lease_is_valid(di)) | |
1795 | return 0; | |
1796 | if (__dir_lease_try_check(dentry)) | |
1797 | return 0; | |
1798 | } | |
1799 | return 1; | |
1800 | } | |
1801 | ||
2817b000 | 1802 | /* |
147851d2 | 1803 | * Release our ceph_dentry_info. |
2817b000 | 1804 | */ |
147851d2 | 1805 | static void ceph_d_release(struct dentry *dentry) |
2817b000 SW |
1806 | { |
1807 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
f9009efa | 1808 | struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); |
2817b000 | 1809 | |
147851d2 | 1810 | dout("d_release %p\n", dentry); |
5b484a51 | 1811 | |
f9009efa XL |
1812 | atomic64_dec(&fsc->mdsc->metric.total_dentries); |
1813 | ||
5b484a51 | 1814 | spin_lock(&dentry->d_lock); |
37c4efc1 | 1815 | __dentry_lease_unlist(di); |
5b484a51 JL |
1816 | dentry->d_fsdata = NULL; |
1817 | spin_unlock(&dentry->d_lock); | |
1818 | ||
7e65624d | 1819 | ceph_put_mds_session(di->lease_session); |
3d8eb7a9 | 1820 | kmem_cache_free(ceph_dentry_cachep, di); |
2817b000 SW |
1821 | } |
1822 | ||
b58dc410 SW |
1823 | /* |
1824 | * When the VFS prunes a dentry from the cache, we need to clear the | |
1825 | * complete flag on the parent directory. | |
1826 | * | |
1827 | * Called under dentry->d_lock. | |
1828 | */ | |
1829 | static void ceph_d_prune(struct dentry *dentry) | |
1830 | { | |
5495c2d0 YZ |
1831 | struct ceph_inode_info *dir_ci; |
1832 | struct ceph_dentry_info *di; | |
1833 | ||
1834 | dout("ceph_d_prune %pd %p\n", dentry, dentry); | |
b58dc410 SW |
1835 | |
1836 | /* do we have a valid parent? */ | |
8842b3be | 1837 | if (IS_ROOT(dentry)) |
b58dc410 SW |
1838 | return; |
1839 | ||
5495c2d0 YZ |
1840 | /* we hold d_lock, so d_parent is stable */ |
1841 | dir_ci = ceph_inode(d_inode(dentry->d_parent)); | |
1842 | if (dir_ci->i_vino.snap == CEPH_SNAPDIR) | |
b58dc410 | 1843 | return; |
2817b000 | 1844 | |
5495c2d0 YZ |
1845 | /* who calls d_delete() should also disable dcache readdir */ |
1846 | if (d_really_is_negative(dentry)) | |
18fc8abd AV |
1847 | return; |
1848 | ||
5495c2d0 YZ |
1849 | /* d_fsdata does not get cleared until d_release */ |
1850 | if (!d_unhashed(dentry)) { | |
1851 | __ceph_dir_clear_complete(dir_ci); | |
1852 | return; | |
1853 | } | |
1854 | ||
1855 | /* Disable dcache readdir just in case that someone called d_drop() | |
1856 | * or d_invalidate(), but MDS didn't revoke CEPH_CAP_FILE_SHARED | |
1857 | * properly (dcache readdir is still enabled) */ | |
1858 | di = ceph_dentry(dentry); | |
1859 | if (di->offset > 0 && | |
1860 | di->lease_shared_gen == atomic_read(&dir_ci->i_shared_gen)) | |
1861 | __ceph_dir_clear_ordered(dir_ci); | |
b58dc410 | 1862 | } |
2817b000 SW |
1863 | |
1864 | /* | |
1865 | * read() on a dir. This weird interface hack only works if mounted | |
1866 | * with '-o dirstat'. | |
1867 | */ | |
1868 | static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, | |
1869 | loff_t *ppos) | |
1870 | { | |
bb48bd4d | 1871 | struct ceph_dir_file_info *dfi = file->private_data; |
496ad9aa | 1872 | struct inode *inode = file_inode(file); |
2817b000 SW |
1873 | struct ceph_inode_info *ci = ceph_inode(inode); |
1874 | int left; | |
ae598083 | 1875 | const int bufsize = 1024; |
2817b000 | 1876 | |
3d14c5d2 | 1877 | if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT)) |
2817b000 SW |
1878 | return -EISDIR; |
1879 | ||
bb48bd4d CX |
1880 | if (!dfi->dir_info) { |
1881 | dfi->dir_info = kmalloc(bufsize, GFP_KERNEL); | |
1882 | if (!dfi->dir_info) | |
2817b000 | 1883 | return -ENOMEM; |
bb48bd4d CX |
1884 | dfi->dir_info_len = |
1885 | snprintf(dfi->dir_info, bufsize, | |
2817b000 SW |
1886 | "entries: %20lld\n" |
1887 | " files: %20lld\n" | |
1888 | " subdirs: %20lld\n" | |
1889 | "rentries: %20lld\n" | |
1890 | " rfiles: %20lld\n" | |
1891 | " rsubdirs: %20lld\n" | |
1892 | "rbytes: %20lld\n" | |
9bbeab41 | 1893 | "rctime: %10lld.%09ld\n", |
2817b000 SW |
1894 | ci->i_files + ci->i_subdirs, |
1895 | ci->i_files, | |
1896 | ci->i_subdirs, | |
1897 | ci->i_rfiles + ci->i_rsubdirs, | |
1898 | ci->i_rfiles, | |
1899 | ci->i_rsubdirs, | |
1900 | ci->i_rbytes, | |
9bbeab41 AB |
1901 | ci->i_rctime.tv_sec, |
1902 | ci->i_rctime.tv_nsec); | |
2817b000 SW |
1903 | } |
1904 | ||
bb48bd4d | 1905 | if (*ppos >= dfi->dir_info_len) |
2817b000 | 1906 | return 0; |
bb48bd4d CX |
1907 | size = min_t(unsigned, size, dfi->dir_info_len-*ppos); |
1908 | left = copy_to_user(buf, dfi->dir_info + *ppos, size); | |
2817b000 SW |
1909 | if (left == size) |
1910 | return -EFAULT; | |
1911 | *ppos += (size - left); | |
1912 | return size - left; | |
1913 | } | |
1914 | ||
2817b000 | 1915 | |
2817b000 | 1916 | |
6c0f3af7 SW |
1917 | /* |
1918 | * Return name hash for a given dentry. This is dependent on | |
1919 | * the parent directory's hash function. | |
1920 | */ | |
e5f86dc3 | 1921 | unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn) |
6c0f3af7 | 1922 | { |
6c0f3af7 | 1923 | struct ceph_inode_info *dci = ceph_inode(dir); |
76a495d6 | 1924 | unsigned hash; |
6c0f3af7 SW |
1925 | |
1926 | switch (dci->i_dir_layout.dl_dir_hash) { | |
1927 | case 0: /* for backward compat */ | |
1928 | case CEPH_STR_HASH_LINUX: | |
1929 | return dn->d_name.hash; | |
1930 | ||
1931 | default: | |
76a495d6 JL |
1932 | spin_lock(&dn->d_lock); |
1933 | hash = ceph_str_hash(dci->i_dir_layout.dl_dir_hash, | |
6c0f3af7 | 1934 | dn->d_name.name, dn->d_name.len); |
76a495d6 JL |
1935 | spin_unlock(&dn->d_lock); |
1936 | return hash; | |
6c0f3af7 SW |
1937 | } |
1938 | } | |
1939 | ||
2817b000 SW |
1940 | const struct file_operations ceph_dir_fops = { |
1941 | .read = ceph_read_dir, | |
77acfa29 | 1942 | .iterate = ceph_readdir, |
2817b000 SW |
1943 | .llseek = ceph_dir_llseek, |
1944 | .open = ceph_open, | |
1945 | .release = ceph_release, | |
1946 | .unlocked_ioctl = ceph_ioctl, | |
18bd6caa | 1947 | .compat_ioctl = compat_ptr_ioctl, |
da819c81 | 1948 | .fsync = ceph_fsync, |
597817dd YZ |
1949 | .lock = ceph_lock, |
1950 | .flock = ceph_flock, | |
2817b000 SW |
1951 | }; |
1952 | ||
38c48b5f YZ |
1953 | const struct file_operations ceph_snapdir_fops = { |
1954 | .iterate = ceph_readdir, | |
1955 | .llseek = ceph_dir_llseek, | |
1956 | .open = ceph_open, | |
1957 | .release = ceph_release, | |
1958 | }; | |
1959 | ||
2817b000 SW |
1960 | const struct inode_operations ceph_dir_iops = { |
1961 | .lookup = ceph_lookup, | |
1962 | .permission = ceph_permission, | |
1963 | .getattr = ceph_getattr, | |
1964 | .setattr = ceph_setattr, | |
2817b000 | 1965 | .listxattr = ceph_listxattr, |
7221fe4c | 1966 | .get_acl = ceph_get_acl, |
72466d0b | 1967 | .set_acl = ceph_set_acl, |
2817b000 SW |
1968 | .mknod = ceph_mknod, |
1969 | .symlink = ceph_symlink, | |
1970 | .mkdir = ceph_mkdir, | |
1971 | .link = ceph_link, | |
1972 | .unlink = ceph_unlink, | |
1973 | .rmdir = ceph_unlink, | |
1974 | .rename = ceph_rename, | |
1975 | .create = ceph_create, | |
2d83bde9 | 1976 | .atomic_open = ceph_atomic_open, |
2817b000 SW |
1977 | }; |
1978 | ||
38c48b5f YZ |
1979 | const struct inode_operations ceph_snapdir_iops = { |
1980 | .lookup = ceph_lookup, | |
1981 | .permission = ceph_permission, | |
1982 | .getattr = ceph_getattr, | |
1983 | .mkdir = ceph_mkdir, | |
1984 | .rmdir = ceph_unlink, | |
0ea611a3 | 1985 | .rename = ceph_rename, |
38c48b5f YZ |
1986 | }; |
1987 | ||
52dfb8ac | 1988 | const struct dentry_operations ceph_dentry_ops = { |
2817b000 | 1989 | .d_revalidate = ceph_d_revalidate, |
1e9c2eb6 | 1990 | .d_delete = ceph_d_delete, |
147851d2 | 1991 | .d_release = ceph_d_release, |
b58dc410 | 1992 | .d_prune = ceph_d_prune, |
ad5cb123 | 1993 | .d_init = ceph_d_init, |
2817b000 | 1994 | }; |