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" |
af9ffa6d | 12 | #include "crypto.h" |
2817b000 SW |
13 | |
14 | /* | |
15 | * Directory operations: readdir, lookup, create, link, unlink, | |
16 | * rename, etc. | |
17 | */ | |
18 | ||
19 | /* | |
20 | * Ceph MDS operations are specified in terms of a base ino and | |
21 | * relative path. Thus, the client can specify an operation on a | |
22 | * specific inode (e.g., a getattr due to fstat(2)), or as a path | |
23 | * relative to, say, the root directory. | |
24 | * | |
25 | * Normally, we limit ourselves to strict inode ops (no path component) | |
26 | * or dentry operations (a single path component relative to an ino). The | |
27 | * exception to this is open_root_dentry(), which will open the mount | |
28 | * point by name. | |
29 | */ | |
30 | ||
52dfb8ac | 31 | const struct dentry_operations ceph_dentry_ops; |
2817b000 | 32 | |
37c4efc1 YZ |
33 | static bool __dentry_lease_is_valid(struct ceph_dentry_info *di); |
34 | static int __dir_lease_try_check(const struct dentry *dentry); | |
35 | ||
2817b000 SW |
36 | /* |
37 | * Initialize ceph dentry state. | |
38 | */ | |
ad5cb123 | 39 | static int ceph_d_init(struct dentry *dentry) |
2817b000 SW |
40 | { |
41 | struct ceph_dentry_info *di; | |
2678da88 | 42 | struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dentry->d_sb); |
2817b000 | 43 | |
99ec2697 | 44 | di = kmem_cache_zalloc(ceph_dentry_cachep, GFP_KERNEL); |
2817b000 SW |
45 | if (!di) |
46 | return -ENOMEM; /* oh well */ | |
47 | ||
2817b000 SW |
48 | di->dentry = dentry; |
49 | di->lease_session = NULL; | |
9b16f03c | 50 | di->time = jiffies; |
48d0cbd1 | 51 | dentry->d_fsdata = di; |
37c4efc1 | 52 | INIT_LIST_HEAD(&di->lease_list); |
f9009efa XL |
53 | |
54 | atomic64_inc(&mdsc->metric.total_dentries); | |
55 | ||
2817b000 SW |
56 | return 0; |
57 | } | |
58 | ||
2817b000 | 59 | /* |
f3c4ebe6 YZ |
60 | * for f_pos for readdir: |
61 | * - hash order: | |
62 | * (0xff << 52) | ((24 bits hash) << 28) | | |
63 | * (the nth entry has hash collision); | |
64 | * - frag+name order; | |
65 | * ((frag value) << 28) | (the nth entry in frag); | |
2817b000 | 66 | */ |
f3c4ebe6 YZ |
67 | #define OFFSET_BITS 28 |
68 | #define OFFSET_MASK ((1 << OFFSET_BITS) - 1) | |
69 | #define HASH_ORDER (0xffull << (OFFSET_BITS + 24)) | |
70 | loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order) | |
71 | { | |
72 | loff_t fpos = ((loff_t)high << 28) | (loff_t)off; | |
73 | if (hash_order) | |
74 | fpos |= HASH_ORDER; | |
75 | return fpos; | |
76 | } | |
77 | ||
78 | static bool is_hash_order(loff_t p) | |
79 | { | |
80 | return (p & HASH_ORDER) == HASH_ORDER; | |
81 | } | |
82 | ||
2817b000 SW |
83 | static unsigned fpos_frag(loff_t p) |
84 | { | |
f3c4ebe6 | 85 | return p >> OFFSET_BITS; |
2817b000 | 86 | } |
f3c4ebe6 YZ |
87 | |
88 | static unsigned fpos_hash(loff_t p) | |
89 | { | |
90 | return ceph_frag_value(fpos_frag(p)); | |
91 | } | |
92 | ||
2817b000 SW |
93 | static unsigned fpos_off(loff_t p) |
94 | { | |
f3c4ebe6 | 95 | return p & OFFSET_MASK; |
2817b000 SW |
96 | } |
97 | ||
4d5f5df6 YZ |
98 | static int fpos_cmp(loff_t l, loff_t r) |
99 | { | |
100 | int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r)); | |
101 | if (v) | |
102 | return v; | |
103 | return (int)(fpos_off(l) - fpos_off(r)); | |
104 | } | |
105 | ||
fdd4e158 YZ |
106 | /* |
107 | * make note of the last dentry we read, so we can | |
108 | * continue at the same lexicographical point, | |
109 | * regardless of what dir changes take place on the | |
110 | * server. | |
111 | */ | |
38d46409 XL |
112 | static int note_last_dentry(struct ceph_fs_client *fsc, |
113 | struct ceph_dir_file_info *dfi, | |
114 | const char *name, | |
fdd4e158 YZ |
115 | int len, unsigned next_offset) |
116 | { | |
117 | char *buf = kmalloc(len+1, GFP_KERNEL); | |
118 | if (!buf) | |
119 | return -ENOMEM; | |
bb48bd4d CX |
120 | kfree(dfi->last_name); |
121 | dfi->last_name = buf; | |
122 | memcpy(dfi->last_name, name, len); | |
123 | dfi->last_name[len] = 0; | |
124 | dfi->next_offset = next_offset; | |
38d46409 | 125 | doutc(fsc->client, "'%s'\n", dfi->last_name); |
fdd4e158 YZ |
126 | return 0; |
127 | } | |
128 | ||
c530cd24 YZ |
129 | |
130 | static struct dentry * | |
131 | __dcache_find_get_entry(struct dentry *parent, u64 idx, | |
132 | struct ceph_readdir_cache_control *cache_ctl) | |
133 | { | |
134 | struct inode *dir = d_inode(parent); | |
38d46409 | 135 | struct ceph_client *cl = ceph_inode_to_client(dir); |
c530cd24 YZ |
136 | struct dentry *dentry; |
137 | unsigned idx_mask = (PAGE_SIZE / sizeof(struct dentry *)) - 1; | |
138 | loff_t ptr_pos = idx * sizeof(struct dentry *); | |
139 | pgoff_t ptr_pgoff = ptr_pos >> PAGE_SHIFT; | |
140 | ||
141 | if (ptr_pos >= i_size_read(dir)) | |
142 | return NULL; | |
143 | ||
144 | if (!cache_ctl->page || ptr_pgoff != page_index(cache_ctl->page)) { | |
145 | ceph_readdir_cache_release(cache_ctl); | |
146 | cache_ctl->page = find_lock_page(&dir->i_data, ptr_pgoff); | |
147 | if (!cache_ctl->page) { | |
38d46409 | 148 | doutc(cl, " page %lu not found\n", ptr_pgoff); |
c530cd24 YZ |
149 | return ERR_PTR(-EAGAIN); |
150 | } | |
151 | /* reading/filling the cache are serialized by | |
810313c5 | 152 | i_rwsem, no need to use page lock */ |
c530cd24 YZ |
153 | unlock_page(cache_ctl->page); |
154 | cache_ctl->dentries = kmap(cache_ctl->page); | |
155 | } | |
156 | ||
157 | cache_ctl->index = idx & idx_mask; | |
158 | ||
159 | rcu_read_lock(); | |
160 | spin_lock(&parent->d_lock); | |
161 | /* check i_size again here, because empty directory can be | |
810313c5 | 162 | * marked as complete while not holding the i_rwsem. */ |
c530cd24 YZ |
163 | if (ceph_dir_is_complete_ordered(dir) && ptr_pos < i_size_read(dir)) |
164 | dentry = cache_ctl->dentries[cache_ctl->index]; | |
165 | else | |
166 | dentry = NULL; | |
167 | spin_unlock(&parent->d_lock); | |
168 | if (dentry && !lockref_get_not_dead(&dentry->d_lockref)) | |
169 | dentry = NULL; | |
170 | rcu_read_unlock(); | |
171 | return dentry ? : ERR_PTR(-EAGAIN); | |
172 | } | |
173 | ||
2817b000 SW |
174 | /* |
175 | * When possible, we try to satisfy a readdir by peeking at the | |
176 | * dcache. We make this work by carefully ordering dentries on | |
da549bdd | 177 | * d_children when we initially get results back from the MDS, and |
2817b000 SW |
178 | * falling back to a "normal" sync readdir if any dentries in the dir |
179 | * are dropped. | |
180 | * | |
2f276c51 | 181 | * Complete dir indicates that we have all dentries in the dir. It is |
2817b000 SW |
182 | * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by |
183 | * the MDS if/when the directory is modified). | |
184 | */ | |
a30be7cb | 185 | static int __dcache_readdir(struct file *file, struct dir_context *ctx, |
97aeb6bf | 186 | int shared_gen) |
2817b000 | 187 | { |
bb48bd4d | 188 | struct ceph_dir_file_info *dfi = file->private_data; |
b583043e | 189 | struct dentry *parent = file->f_path.dentry; |
2b0143b5 | 190 | struct inode *dir = d_inode(parent); |
38d46409 XL |
191 | struct ceph_fs_client *fsc = ceph_inode_to_fs_client(dir); |
192 | struct ceph_client *cl = ceph_inode_to_client(dir); | |
fdd4e158 | 193 | struct dentry *dentry, *last = NULL; |
2817b000 | 194 | struct ceph_dentry_info *di; |
fdd4e158 | 195 | struct ceph_readdir_cache_control cache_ctl = {}; |
c530cd24 YZ |
196 | u64 idx = 0; |
197 | int err = 0; | |
2817b000 | 198 | |
38d46409 XL |
199 | doutc(cl, "%p %llx.%llx v%u at %llx\n", dir, ceph_vinop(dir), |
200 | (unsigned)shared_gen, ctx->pos); | |
2817b000 | 201 | |
c530cd24 YZ |
202 | /* search start position */ |
203 | if (ctx->pos > 2) { | |
204 | u64 count = div_u64(i_size_read(dir), sizeof(struct dentry *)); | |
205 | while (count > 0) { | |
206 | u64 step = count >> 1; | |
207 | dentry = __dcache_find_get_entry(parent, idx + step, | |
208 | &cache_ctl); | |
209 | if (!dentry) { | |
210 | /* use linar search */ | |
211 | idx = 0; | |
212 | break; | |
213 | } | |
214 | if (IS_ERR(dentry)) { | |
215 | err = PTR_ERR(dentry); | |
216 | goto out; | |
217 | } | |
218 | di = ceph_dentry(dentry); | |
219 | spin_lock(&dentry->d_lock); | |
220 | if (fpos_cmp(di->offset, ctx->pos) < 0) { | |
221 | idx += step + 1; | |
222 | count -= step + 1; | |
223 | } else { | |
224 | count = step; | |
225 | } | |
226 | spin_unlock(&dentry->d_lock); | |
227 | dput(dentry); | |
228 | } | |
2817b000 | 229 | |
38d46409 XL |
230 | doutc(cl, "%p %llx.%llx cache idx %llu\n", dir, |
231 | ceph_vinop(dir), idx); | |
2817b000 SW |
232 | } |
233 | ||
fdd4e158 | 234 | |
c530cd24 YZ |
235 | for (;;) { |
236 | bool emit_dentry = false; | |
237 | dentry = __dcache_find_get_entry(parent, idx++, &cache_ctl); | |
238 | if (!dentry) { | |
bb48bd4d | 239 | dfi->file_info.flags |= CEPH_F_ATEND; |
fdd4e158 YZ |
240 | err = 0; |
241 | break; | |
2817b000 | 242 | } |
c530cd24 YZ |
243 | if (IS_ERR(dentry)) { |
244 | err = PTR_ERR(dentry); | |
245 | goto out; | |
fdd4e158 YZ |
246 | } |
247 | ||
fdd4e158 | 248 | spin_lock(&dentry->d_lock); |
5495c2d0 YZ |
249 | di = ceph_dentry(dentry); |
250 | if (d_unhashed(dentry) || | |
251 | d_really_is_negative(dentry) || | |
af9ffa6d XL |
252 | di->lease_shared_gen != shared_gen || |
253 | ((dentry->d_flags & DCACHE_NOKEY_NAME) && | |
254 | fscrypt_has_encryption_key(dir))) { | |
5495c2d0 YZ |
255 | spin_unlock(&dentry->d_lock); |
256 | dput(dentry); | |
257 | err = -EAGAIN; | |
258 | goto out; | |
259 | } | |
260 | if (fpos_cmp(ctx->pos, di->offset) <= 0) { | |
37c4efc1 | 261 | __ceph_dentry_dir_lease_touch(di); |
fdd4e158 YZ |
262 | emit_dentry = true; |
263 | } | |
da502956 | 264 | spin_unlock(&dentry->d_lock); |
2817b000 | 265 | |
fdd4e158 | 266 | if (emit_dentry) { |
38d46409 XL |
267 | doutc(cl, " %llx dentry %p %pd %p\n", di->offset, |
268 | dentry, dentry, d_inode(dentry)); | |
fdd4e158 YZ |
269 | ctx->pos = di->offset; |
270 | if (!dir_emit(ctx, dentry->d_name.name, | |
ebce3eb2 | 271 | dentry->d_name.len, ceph_present_inode(d_inode(dentry)), |
fdd4e158 YZ |
272 | d_inode(dentry)->i_mode >> 12)) { |
273 | dput(dentry); | |
274 | err = 0; | |
275 | break; | |
276 | } | |
277 | ctx->pos++; | |
0081bd83 | 278 | |
fdd4e158 YZ |
279 | if (last) |
280 | dput(last); | |
281 | last = dentry; | |
282 | } else { | |
283 | dput(dentry); | |
2817b000 | 284 | } |
fdd4e158 | 285 | } |
c530cd24 | 286 | out: |
fdd4e158 YZ |
287 | ceph_readdir_cache_release(&cache_ctl); |
288 | if (last) { | |
289 | int ret; | |
290 | di = ceph_dentry(last); | |
38d46409 XL |
291 | ret = note_last_dentry(fsc, dfi, last->d_name.name, |
292 | last->d_name.len, | |
fdd4e158 YZ |
293 | fpos_off(di->offset) + 1); |
294 | if (ret < 0) | |
295 | err = ret; | |
2817b000 | 296 | dput(last); |
84583cfb | 297 | /* last_name no longer match cache index */ |
bb48bd4d CX |
298 | if (dfi->readdir_cache_idx >= 0) { |
299 | dfi->readdir_cache_idx = -1; | |
300 | dfi->dir_release_count = 0; | |
84583cfb | 301 | } |
fdd4e158 | 302 | } |
2817b000 SW |
303 | return err; |
304 | } | |
305 | ||
bb48bd4d | 306 | static bool need_send_readdir(struct ceph_dir_file_info *dfi, loff_t pos) |
f3c4ebe6 | 307 | { |
bb48bd4d | 308 | if (!dfi->last_readdir) |
f3c4ebe6 YZ |
309 | return true; |
310 | if (is_hash_order(pos)) | |
bb48bd4d | 311 | return !ceph_frag_contains_value(dfi->frag, fpos_hash(pos)); |
f3c4ebe6 | 312 | else |
bb48bd4d | 313 | return dfi->frag != fpos_frag(pos); |
f3c4ebe6 YZ |
314 | } |
315 | ||
77acfa29 | 316 | static int ceph_readdir(struct file *file, struct dir_context *ctx) |
2817b000 | 317 | { |
bb48bd4d | 318 | struct ceph_dir_file_info *dfi = file->private_data; |
77acfa29 | 319 | struct inode *inode = file_inode(file); |
2817b000 | 320 | struct ceph_inode_info *ci = ceph_inode(inode); |
5995d90d | 321 | struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode); |
3d14c5d2 | 322 | struct ceph_mds_client *mdsc = fsc->mdsc; |
38d46409 | 323 | struct ceph_client *cl = fsc->client; |
8974eebd | 324 | int i; |
2817b000 | 325 | int err; |
b50c2de5 | 326 | unsigned frag = -1; |
2817b000 | 327 | struct ceph_mds_reply_info_parsed *rinfo; |
2817b000 | 328 | |
38d46409 XL |
329 | doutc(cl, "%p %llx.%llx file %p pos %llx\n", inode, |
330 | ceph_vinop(inode), file, ctx->pos); | |
bb48bd4d | 331 | if (dfi->file_info.flags & CEPH_F_ATEND) |
2817b000 SW |
332 | return 0; |
333 | ||
334 | /* always start with . and .. */ | |
77acfa29 | 335 | if (ctx->pos == 0) { |
38d46409 XL |
336 | doutc(cl, "%p %llx.%llx off 0 -> '.'\n", inode, |
337 | ceph_vinop(inode)); | |
ebce3eb2 | 338 | if (!dir_emit(ctx, ".", 1, ceph_present_inode(inode), |
77acfa29 | 339 | inode->i_mode >> 12)) |
2817b000 | 340 | return 0; |
77acfa29 | 341 | ctx->pos = 1; |
2817b000 | 342 | } |
77acfa29 | 343 | if (ctx->pos == 1) { |
ebce3eb2 JL |
344 | u64 ino; |
345 | struct dentry *dentry = file->f_path.dentry; | |
346 | ||
347 | spin_lock(&dentry->d_lock); | |
348 | ino = ceph_present_inode(dentry->d_parent->d_inode); | |
349 | spin_unlock(&dentry->d_lock); | |
350 | ||
38d46409 XL |
351 | doutc(cl, "%p %llx.%llx off 1 -> '..'\n", inode, |
352 | ceph_vinop(inode)); | |
ebce3eb2 | 353 | if (!dir_emit(ctx, "..", 2, ino, inode->i_mode >> 12)) |
2817b000 | 354 | return 0; |
77acfa29 | 355 | ctx->pos = 2; |
2817b000 SW |
356 | } |
357 | ||
14e034a6 LH |
358 | err = ceph_fscrypt_prepare_readdir(inode); |
359 | if (err < 0) | |
af9ffa6d XL |
360 | return err; |
361 | ||
be655596 | 362 | spin_lock(&ci->i_ceph_lock); |
719a2514 YZ |
363 | /* request Fx cap. if have Fx, we don't need to release Fs cap |
364 | * for later create/unlink. */ | |
365 | __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_WR); | |
366 | /* can we use the dcache? */ | |
fdd4e158 | 367 | if (ceph_test_mount_opt(fsc, DCACHE) && |
3d14c5d2 | 368 | !ceph_test_mount_opt(fsc, NOASYNCREADDIR) && |
a0dff78d | 369 | ceph_snap(inode) != CEPH_SNAPDIR && |
70db4f36 | 370 | __ceph_dir_is_complete_ordered(ci) && |
1af16d54 | 371 | __ceph_caps_issued_mask_metric(ci, CEPH_CAP_FILE_SHARED, 1)) { |
97aeb6bf | 372 | int shared_gen = atomic_read(&ci->i_shared_gen); |
1af16d54 | 373 | |
be655596 | 374 | spin_unlock(&ci->i_ceph_lock); |
a30be7cb | 375 | err = __dcache_readdir(file, ctx, shared_gen); |
efa4c120 | 376 | if (err != -EAGAIN) |
2817b000 | 377 | return err; |
efa4c120 | 378 | } else { |
be655596 | 379 | spin_unlock(&ci->i_ceph_lock); |
2817b000 | 380 | } |
2817b000 SW |
381 | |
382 | /* proceed with a normal readdir */ | |
2817b000 SW |
383 | more: |
384 | /* do we have the correct frag content buffered? */ | |
bb48bd4d | 385 | if (need_send_readdir(dfi, ctx->pos)) { |
2817b000 SW |
386 | struct ceph_mds_request *req; |
387 | int op = ceph_snap(inode) == CEPH_SNAPDIR ? | |
388 | CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR; | |
389 | ||
390 | /* discard old result, if any */ | |
bb48bd4d CX |
391 | if (dfi->last_readdir) { |
392 | ceph_mdsc_put_request(dfi->last_readdir); | |
393 | dfi->last_readdir = NULL; | |
393f6620 | 394 | } |
2817b000 | 395 | |
f3c4ebe6 | 396 | if (is_hash_order(ctx->pos)) { |
b50c2de5 YZ |
397 | /* fragtree isn't always accurate. choose frag |
398 | * based on previous reply when possible. */ | |
399 | if (frag == (unsigned)-1) | |
400 | frag = ceph_choose_frag(ci, fpos_hash(ctx->pos), | |
401 | NULL, NULL); | |
f3c4ebe6 YZ |
402 | } else { |
403 | frag = fpos_frag(ctx->pos); | |
404 | } | |
405 | ||
38d46409 XL |
406 | doutc(cl, "fetching %p %llx.%llx frag %x offset '%s'\n", |
407 | inode, ceph_vinop(inode), frag, dfi->last_name); | |
2817b000 SW |
408 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); |
409 | if (IS_ERR(req)) | |
410 | return PTR_ERR(req); | |
af9ffa6d | 411 | |
54008399 YZ |
412 | err = ceph_alloc_readdir_reply_buffer(req, inode); |
413 | if (err) { | |
414 | ceph_mdsc_put_request(req); | |
415 | return err; | |
416 | } | |
2817b000 SW |
417 | /* hints to request -> mds selection code */ |
418 | req->r_direct_mode = USE_AUTH_MDS; | |
5d37ca14 YZ |
419 | if (op == CEPH_MDS_OP_READDIR) { |
420 | req->r_direct_hash = ceph_frag_value(frag); | |
421 | __set_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags); | |
87c91a96 | 422 | req->r_inode_drop = CEPH_CAP_FILE_EXCL; |
5d37ca14 | 423 | } |
bb48bd4d | 424 | if (dfi->last_name) { |
af9ffa6d XL |
425 | struct qstr d_name = { .name = dfi->last_name, |
426 | .len = strlen(dfi->last_name) }; | |
427 | ||
428 | req->r_path2 = kzalloc(NAME_MAX + 1, GFP_KERNEL); | |
a149bb9a SK |
429 | if (!req->r_path2) { |
430 | ceph_mdsc_put_request(req); | |
431 | return -ENOMEM; | |
432 | } | |
af9ffa6d XL |
433 | |
434 | err = ceph_encode_encrypted_dname(inode, &d_name, | |
435 | req->r_path2); | |
436 | if (err < 0) { | |
437 | ceph_mdsc_put_request(req); | |
438 | return err; | |
439 | } | |
79162547 YZ |
440 | } else if (is_hash_order(ctx->pos)) { |
441 | req->r_args.readdir.offset_hash = | |
442 | cpu_to_le32(fpos_hash(ctx->pos)); | |
a149bb9a | 443 | } |
79162547 | 444 | |
bb48bd4d CX |
445 | req->r_dir_release_cnt = dfi->dir_release_count; |
446 | req->r_dir_ordered_cnt = dfi->dir_ordered_count; | |
447 | req->r_readdir_cache_idx = dfi->readdir_cache_idx; | |
448 | req->r_readdir_offset = dfi->next_offset; | |
2817b000 | 449 | req->r_args.readdir.frag = cpu_to_le32(frag); |
956d39d6 YZ |
450 | req->r_args.readdir.flags = |
451 | cpu_to_le16(CEPH_READDIR_REPLY_BITFLAGS); | |
a149bb9a SK |
452 | |
453 | req->r_inode = inode; | |
454 | ihold(inode); | |
455 | req->r_dentry = dget(file->f_path.dentry); | |
2817b000 SW |
456 | err = ceph_mdsc_do_request(mdsc, NULL, req); |
457 | if (err < 0) { | |
458 | ceph_mdsc_put_request(req); | |
459 | return err; | |
460 | } | |
38d46409 XL |
461 | doutc(cl, "%p %llx.%llx got and parsed readdir result=%d" |
462 | "on frag %x, end=%d, complete=%d, hash_order=%d\n", | |
463 | inode, ceph_vinop(inode), err, frag, | |
464 | (int)req->r_reply_info.dir_end, | |
465 | (int)req->r_reply_info.dir_complete, | |
466 | (int)req->r_reply_info.hash_order); | |
2817b000 | 467 | |
81c6aea5 YZ |
468 | rinfo = &req->r_reply_info; |
469 | if (le32_to_cpu(rinfo->dir_dir->frag) != frag) { | |
470 | frag = le32_to_cpu(rinfo->dir_dir->frag); | |
f3c4ebe6 | 471 | if (!rinfo->hash_order) { |
bb48bd4d | 472 | dfi->next_offset = req->r_readdir_offset; |
f3c4ebe6 YZ |
473 | /* adjust ctx->pos to beginning of frag */ |
474 | ctx->pos = ceph_make_fpos(frag, | |
bb48bd4d | 475 | dfi->next_offset, |
f3c4ebe6 YZ |
476 | false); |
477 | } | |
81c6aea5 | 478 | } |
fdd4e158 | 479 | |
bb48bd4d CX |
480 | dfi->frag = frag; |
481 | dfi->last_readdir = req; | |
2817b000 | 482 | |
bc2de10d | 483 | if (test_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags)) { |
bb48bd4d CX |
484 | dfi->readdir_cache_idx = req->r_readdir_cache_idx; |
485 | if (dfi->readdir_cache_idx < 0) { | |
fdd4e158 | 486 | /* preclude from marking dir ordered */ |
bb48bd4d | 487 | dfi->dir_ordered_count = 0; |
8974eebd | 488 | } else if (ceph_frag_is_leftmost(frag) && |
bb48bd4d | 489 | dfi->next_offset == 2) { |
fdd4e158 YZ |
490 | /* note dir version at start of readdir so |
491 | * we can tell if any dentries get dropped */ | |
bb48bd4d CX |
492 | dfi->dir_release_count = req->r_dir_release_cnt; |
493 | dfi->dir_ordered_count = req->r_dir_ordered_cnt; | |
fdd4e158 YZ |
494 | } |
495 | } else { | |
38d46409 XL |
496 | doutc(cl, "%p %llx.%llx !did_prepopulate\n", inode, |
497 | ceph_vinop(inode)); | |
fdd4e158 | 498 | /* disable readdir cache */ |
bb48bd4d | 499 | dfi->readdir_cache_idx = -1; |
fdd4e158 | 500 | /* preclude from marking dir complete */ |
bb48bd4d | 501 | dfi->dir_release_count = 0; |
fdd4e158 YZ |
502 | } |
503 | ||
f3c4ebe6 YZ |
504 | /* note next offset and last dentry name */ |
505 | if (rinfo->dir_nr > 0) { | |
2a5beea3 YZ |
506 | struct ceph_mds_reply_dir_entry *rde = |
507 | rinfo->dir_entries + (rinfo->dir_nr-1); | |
f3c4ebe6 YZ |
508 | unsigned next_offset = req->r_reply_info.dir_end ? |
509 | 2 : (fpos_off(rde->offset) + 1); | |
38d46409 XL |
510 | err = note_last_dentry(fsc, dfi, rde->name, |
511 | rde->name_len, next_offset); | |
f639d986 XL |
512 | if (err) { |
513 | ceph_mdsc_put_request(dfi->last_readdir); | |
514 | dfi->last_readdir = NULL; | |
2817b000 | 515 | return err; |
f639d986 | 516 | } |
f3c4ebe6 | 517 | } else if (req->r_reply_info.dir_end) { |
bb48bd4d | 518 | dfi->next_offset = 2; |
f3c4ebe6 | 519 | /* keep last name */ |
2817b000 SW |
520 | } |
521 | } | |
522 | ||
bb48bd4d | 523 | rinfo = &dfi->last_readdir->r_reply_info; |
38d46409 XL |
524 | doutc(cl, "%p %llx.%llx frag %x num %d pos %llx chunk first %llx\n", |
525 | inode, ceph_vinop(inode), dfi->frag, rinfo->dir_nr, ctx->pos, | |
526 | rinfo->dir_nr ? rinfo->dir_entries[0].offset : 0LL); | |
77acfa29 | 527 | |
8974eebd YZ |
528 | i = 0; |
529 | /* search start position */ | |
530 | if (rinfo->dir_nr > 0) { | |
531 | int step, nr = rinfo->dir_nr; | |
532 | while (nr > 0) { | |
533 | step = nr >> 1; | |
534 | if (rinfo->dir_entries[i + step].offset < ctx->pos) { | |
535 | i += step + 1; | |
536 | nr -= step + 1; | |
537 | } else { | |
538 | nr = step; | |
539 | } | |
540 | } | |
541 | } | |
542 | for (; i < rinfo->dir_nr; i++) { | |
543 | struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i; | |
3105c19c | 544 | |
af9ffa6d | 545 | if (rde->offset < ctx->pos) { |
38d46409 XL |
546 | pr_warn_client(cl, |
547 | "%p %llx.%llx rde->offset 0x%llx ctx->pos 0x%llx\n", | |
548 | inode, ceph_vinop(inode), rde->offset, ctx->pos); | |
af9ffa6d XL |
549 | return -EIO; |
550 | } | |
551 | ||
552 | if (WARN_ON_ONCE(!rde->inode.in)) | |
553 | return -EIO; | |
8974eebd YZ |
554 | |
555 | ctx->pos = rde->offset; | |
38d46409 XL |
556 | doutc(cl, "%p %llx.%llx (%d/%d) -> %llx '%.*s' %p\n", inode, |
557 | ceph_vinop(inode), i, rinfo->dir_nr, ctx->pos, | |
558 | rde->name_len, rde->name, &rde->inode.in); | |
8974eebd | 559 | |
2a5beea3 | 560 | if (!dir_emit(ctx, rde->name, rde->name_len, |
ebce3eb2 JL |
561 | ceph_present_ino(inode->i_sb, le64_to_cpu(rde->inode.in->ino)), |
562 | le32_to_cpu(rde->inode.in->mode) >> 12)) { | |
f639d986 XL |
563 | /* |
564 | * NOTE: Here no need to put the 'dfi->last_readdir', | |
565 | * because when dir_emit stops us it's most likely | |
566 | * doesn't have enough memory, etc. So for next readdir | |
567 | * it will continue. | |
568 | */ | |
38d46409 | 569 | doutc(cl, "filldir stopping us...\n"); |
2817b000 SW |
570 | return 0; |
571 | } | |
af9ffa6d XL |
572 | |
573 | /* Reset the lengths to their original allocated vals */ | |
77acfa29 | 574 | ctx->pos++; |
2817b000 SW |
575 | } |
576 | ||
bb48bd4d CX |
577 | ceph_mdsc_put_request(dfi->last_readdir); |
578 | dfi->last_readdir = NULL; | |
b50c2de5 | 579 | |
bb48bd4d CX |
580 | if (dfi->next_offset > 2) { |
581 | frag = dfi->frag; | |
2817b000 SW |
582 | goto more; |
583 | } | |
584 | ||
585 | /* more frags? */ | |
bb48bd4d CX |
586 | if (!ceph_frag_is_rightmost(dfi->frag)) { |
587 | frag = ceph_frag_next(dfi->frag); | |
f3c4ebe6 YZ |
588 | if (is_hash_order(ctx->pos)) { |
589 | loff_t new_pos = ceph_make_fpos(ceph_frag_value(frag), | |
bb48bd4d | 590 | dfi->next_offset, true); |
f3c4ebe6 YZ |
591 | if (new_pos > ctx->pos) |
592 | ctx->pos = new_pos; | |
593 | /* keep last_name */ | |
594 | } else { | |
bb48bd4d CX |
595 | ctx->pos = ceph_make_fpos(frag, dfi->next_offset, |
596 | false); | |
597 | kfree(dfi->last_name); | |
598 | dfi->last_name = NULL; | |
f3c4ebe6 | 599 | } |
38d46409 XL |
600 | doutc(cl, "%p %llx.%llx next frag is %x\n", inode, |
601 | ceph_vinop(inode), frag); | |
2817b000 SW |
602 | goto more; |
603 | } | |
bb48bd4d | 604 | dfi->file_info.flags |= CEPH_F_ATEND; |
2817b000 SW |
605 | |
606 | /* | |
607 | * if dir_release_count still matches the dir, no dentries | |
608 | * were released during the whole readdir, and we should have | |
609 | * the complete dir contents in our cache. | |
610 | */ | |
bb48bd4d CX |
611 | if (atomic64_read(&ci->i_release_count) == |
612 | dfi->dir_release_count) { | |
fdd4e158 | 613 | spin_lock(&ci->i_ceph_lock); |
bb48bd4d CX |
614 | if (dfi->dir_ordered_count == |
615 | atomic64_read(&ci->i_ordered_count)) { | |
38d46409 XL |
616 | doutc(cl, " marking %p %llx.%llx complete and ordered\n", |
617 | inode, ceph_vinop(inode)); | |
fdd4e158 YZ |
618 | /* use i_size to track number of entries in |
619 | * readdir cache */ | |
bb48bd4d CX |
620 | BUG_ON(dfi->readdir_cache_idx < 0); |
621 | i_size_write(inode, dfi->readdir_cache_idx * | |
fdd4e158 YZ |
622 | sizeof(struct dentry*)); |
623 | } else { | |
38d46409 XL |
624 | doutc(cl, " marking %llx.%llx complete\n", |
625 | ceph_vinop(inode)); | |
fdd4e158 | 626 | } |
bb48bd4d CX |
627 | __ceph_dir_set_complete(ci, dfi->dir_release_count, |
628 | dfi->dir_ordered_count); | |
fdd4e158 | 629 | spin_unlock(&ci->i_ceph_lock); |
2817b000 | 630 | } |
38d46409 XL |
631 | doutc(cl, "%p %llx.%llx file %p done.\n", inode, ceph_vinop(inode), |
632 | file); | |
2817b000 SW |
633 | return 0; |
634 | } | |
635 | ||
bb48bd4d | 636 | static void reset_readdir(struct ceph_dir_file_info *dfi) |
2817b000 | 637 | { |
bb48bd4d CX |
638 | if (dfi->last_readdir) { |
639 | ceph_mdsc_put_request(dfi->last_readdir); | |
640 | dfi->last_readdir = NULL; | |
2817b000 | 641 | } |
bb48bd4d CX |
642 | kfree(dfi->last_name); |
643 | dfi->last_name = NULL; | |
644 | dfi->dir_release_count = 0; | |
645 | dfi->readdir_cache_idx = -1; | |
646 | dfi->next_offset = 2; /* compensate for . and .. */ | |
647 | dfi->file_info.flags &= ~CEPH_F_ATEND; | |
2817b000 SW |
648 | } |
649 | ||
8974eebd YZ |
650 | /* |
651 | * discard buffered readdir content on seekdir(0), or seek to new frag, | |
652 | * or seek prior to current chunk | |
653 | */ | |
bb48bd4d | 654 | static bool need_reset_readdir(struct ceph_dir_file_info *dfi, loff_t new_pos) |
8974eebd YZ |
655 | { |
656 | struct ceph_mds_reply_info_parsed *rinfo; | |
f3c4ebe6 | 657 | loff_t chunk_offset; |
8974eebd YZ |
658 | if (new_pos == 0) |
659 | return true; | |
f3c4ebe6 YZ |
660 | if (is_hash_order(new_pos)) { |
661 | /* no need to reset last_name for a forward seek when | |
662 | * dentries are sotred in hash order */ | |
bb48bd4d | 663 | } else if (dfi->frag != fpos_frag(new_pos)) { |
8974eebd | 664 | return true; |
f3c4ebe6 | 665 | } |
bb48bd4d | 666 | rinfo = dfi->last_readdir ? &dfi->last_readdir->r_reply_info : NULL; |
8974eebd YZ |
667 | if (!rinfo || !rinfo->dir_nr) |
668 | return true; | |
f3c4ebe6 YZ |
669 | chunk_offset = rinfo->dir_entries[0].offset; |
670 | return new_pos < chunk_offset || | |
671 | is_hash_order(new_pos) != is_hash_order(chunk_offset); | |
8974eebd YZ |
672 | } |
673 | ||
965c8e59 | 674 | static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence) |
2817b000 | 675 | { |
bb48bd4d | 676 | struct ceph_dir_file_info *dfi = file->private_data; |
2817b000 | 677 | struct inode *inode = file->f_mapping->host; |
38d46409 | 678 | struct ceph_client *cl = ceph_inode_to_client(inode); |
2817b000 SW |
679 | loff_t retval; |
680 | ||
5955102c | 681 | inode_lock(inode); |
06222e49 | 682 | retval = -EINVAL; |
965c8e59 | 683 | switch (whence) { |
2817b000 SW |
684 | case SEEK_CUR: |
685 | offset += file->f_pos; | |
fcaddb1d | 686 | break; |
06222e49 JB |
687 | case SEEK_SET: |
688 | break; | |
fdd4e158 YZ |
689 | case SEEK_END: |
690 | retval = -EOPNOTSUPP; | |
fcaddb1d | 691 | goto out; |
06222e49 JB |
692 | default: |
693 | goto out; | |
2817b000 | 694 | } |
06222e49 | 695 | |
f0494206 | 696 | if (offset >= 0) { |
bb48bd4d | 697 | if (need_reset_readdir(dfi, offset)) { |
38d46409 XL |
698 | doutc(cl, "%p %llx.%llx dropping %p content\n", |
699 | inode, ceph_vinop(inode), file); | |
bb48bd4d | 700 | reset_readdir(dfi); |
f3c4ebe6 YZ |
701 | } else if (is_hash_order(offset) && offset > file->f_pos) { |
702 | /* for hash offset, we don't know if a forward seek | |
703 | * is within same frag */ | |
bb48bd4d CX |
704 | dfi->dir_release_count = 0; |
705 | dfi->readdir_cache_idx = -1; | |
f3c4ebe6 YZ |
706 | } |
707 | ||
2817b000 SW |
708 | if (offset != file->f_pos) { |
709 | file->f_pos = offset; | |
710 | file->f_version = 0; | |
bb48bd4d | 711 | dfi->file_info.flags &= ~CEPH_F_ATEND; |
2817b000 SW |
712 | } |
713 | retval = offset; | |
2817b000 | 714 | } |
06222e49 | 715 | out: |
5955102c | 716 | inode_unlock(inode); |
2817b000 SW |
717 | return retval; |
718 | } | |
719 | ||
720 | /* | |
468640e3 | 721 | * Handle lookups for the hidden .snap directory. |
2817b000 | 722 | */ |
aa60cfc3 | 723 | struct dentry *ceph_handle_snapdir(struct ceph_mds_request *req, |
7a971e2c | 724 | struct dentry *dentry) |
2817b000 | 725 | { |
5995d90d | 726 | struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dentry->d_sb); |
810313c5 | 727 | struct inode *parent = d_inode(dentry->d_parent); /* we hold i_rwsem */ |
38d46409 | 728 | struct ceph_client *cl = ceph_inode_to_client(parent); |
2817b000 SW |
729 | |
730 | /* .snap dir? */ | |
7a971e2c | 731 | if (ceph_snap(parent) == CEPH_NOSNAP && |
aa60cfc3 JL |
732 | strcmp(dentry->d_name.name, fsc->mount_options->snapdir_name) == 0) { |
733 | struct dentry *res; | |
2817b000 | 734 | struct inode *inode = ceph_get_snapdir(parent); |
aa60cfc3 JL |
735 | |
736 | res = d_splice_alias(inode, dentry); | |
38d46409 XL |
737 | doutc(cl, "ENOENT on snapdir %p '%pd', linking to " |
738 | "snapdir %p %llx.%llx. Spliced dentry %p\n", | |
739 | dentry, dentry, inode, ceph_vinop(inode), res); | |
aa60cfc3 JL |
740 | if (res) |
741 | dentry = res; | |
2817b000 | 742 | } |
aa60cfc3 | 743 | return dentry; |
468640e3 | 744 | } |
2817b000 | 745 | |
468640e3 SW |
746 | /* |
747 | * Figure out final result of a lookup/open request. | |
748 | * | |
749 | * Mainly, make sure we return the final req->r_dentry (if it already | |
750 | * existed) in place of the original VFS-provided dentry when they | |
751 | * differ. | |
752 | * | |
753 | * Gracefully handle the case where the MDS replies with -ENOENT and | |
754 | * no trace (which it may do, at its discretion, e.g., if it doesn't | |
755 | * care to issue a lease on the negative dentry). | |
756 | */ | |
757 | struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, | |
758 | struct dentry *dentry, int err) | |
759 | { | |
38d46409 XL |
760 | struct ceph_client *cl = req->r_mdsc->fsc->client; |
761 | ||
2817b000 SW |
762 | if (err == -ENOENT) { |
763 | /* no trace? */ | |
764 | err = 0; | |
765 | if (!req->r_reply_info.head->is_dentry) { | |
38d46409 XL |
766 | doutc(cl, |
767 | "ENOENT and no trace, dentry %p inode %llx.%llx\n", | |
768 | dentry, ceph_vinop(d_inode(dentry))); | |
2b0143b5 | 769 | if (d_really_is_positive(dentry)) { |
2817b000 SW |
770 | d_drop(dentry); |
771 | err = -ENOENT; | |
772 | } else { | |
773 | d_add(dentry, NULL); | |
774 | } | |
775 | } | |
776 | } | |
777 | if (err) | |
778 | dentry = ERR_PTR(err); | |
779 | else if (dentry != req->r_dentry) | |
780 | dentry = dget(req->r_dentry); /* we got spliced */ | |
781 | else | |
782 | dentry = NULL; | |
783 | return dentry; | |
784 | } | |
785 | ||
3b33f692 | 786 | static bool is_root_ceph_dentry(struct inode *inode, struct dentry *dentry) |
1d1de916 SW |
787 | { |
788 | return ceph_ino(inode) == CEPH_INO_ROOT && | |
789 | strncmp(dentry->d_name.name, ".ceph", 5) == 0; | |
790 | } | |
791 | ||
2817b000 SW |
792 | /* |
793 | * Look up a single dir entry. If there is a lookup intent, inform | |
794 | * the MDS so that it gets our 'caps wanted' value in a single op. | |
795 | */ | |
796 | static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry, | |
00cd8dd3 | 797 | unsigned int flags) |
2817b000 | 798 | { |
5995d90d | 799 | struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dir->i_sb); |
2678da88 | 800 | struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); |
38d46409 | 801 | struct ceph_client *cl = fsc->client; |
2817b000 SW |
802 | struct ceph_mds_request *req; |
803 | int op; | |
315f2408 | 804 | int mask; |
2817b000 SW |
805 | int err; |
806 | ||
38d46409 XL |
807 | doutc(cl, "%p %llx.%llx/'%pd' dentry %p\n", dir, ceph_vinop(dir), |
808 | dentry, dentry); | |
2817b000 SW |
809 | |
810 | if (dentry->d_name.len > NAME_MAX) | |
811 | return ERR_PTR(-ENAMETOOLONG); | |
812 | ||
cb3524a8 | 813 | if (IS_ENCRYPTED(dir)) { |
d9ae977d LH |
814 | bool had_key = fscrypt_has_encryption_key(dir); |
815 | ||
816 | err = fscrypt_prepare_lookup_partial(dir, dentry); | |
14e034a6 | 817 | if (err < 0) |
cb3524a8 | 818 | return ERR_PTR(err); |
d9ae977d LH |
819 | |
820 | /* mark directory as incomplete if it has been unlocked */ | |
821 | if (!had_key && fscrypt_has_encryption_key(dir)) | |
822 | ceph_dir_clear_complete(dir); | |
cb3524a8 JL |
823 | } |
824 | ||
2817b000 | 825 | /* can we conclude ENOENT locally? */ |
2b0143b5 | 826 | if (d_really_is_negative(dentry)) { |
2817b000 SW |
827 | struct ceph_inode_info *ci = ceph_inode(dir); |
828 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
829 | ||
be655596 | 830 | spin_lock(&ci->i_ceph_lock); |
38d46409 XL |
831 | doutc(cl, " dir %llx.%llx flags are 0x%lx\n", |
832 | ceph_vinop(dir), ci->i_ceph_flags); | |
2817b000 | 833 | if (strncmp(dentry->d_name.name, |
3d14c5d2 | 834 | fsc->mount_options->snapdir_name, |
2817b000 | 835 | dentry->d_name.len) && |
1d1de916 | 836 | !is_root_ceph_dentry(dir, dentry) && |
e2c3de04 | 837 | ceph_test_mount_opt(fsc, DCACHE) && |
2f276c51 | 838 | __ceph_dir_is_complete(ci) && |
1af16d54 | 839 | __ceph_caps_issued_mask_metric(ci, CEPH_CAP_FILE_SHARED, 1)) { |
719a2514 | 840 | __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_RD); |
be655596 | 841 | spin_unlock(&ci->i_ceph_lock); |
38d46409 XL |
842 | doutc(cl, " dir %llx.%llx complete, -ENOENT\n", |
843 | ceph_vinop(dir)); | |
2817b000 | 844 | d_add(dentry, NULL); |
97aeb6bf | 845 | di->lease_shared_gen = atomic_read(&ci->i_shared_gen); |
2817b000 SW |
846 | return NULL; |
847 | } | |
be655596 | 848 | spin_unlock(&ci->i_ceph_lock); |
2817b000 SW |
849 | } |
850 | ||
851 | op = ceph_snap(dir) == CEPH_SNAPDIR ? | |
852 | CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; | |
853 | req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); | |
854 | if (IS_ERR(req)) | |
7e34bc52 | 855 | return ERR_CAST(req); |
2817b000 SW |
856 | req->r_dentry = dget(dentry); |
857 | req->r_num_caps = 2; | |
315f2408 YZ |
858 | |
859 | mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED; | |
860 | if (ceph_security_xattr_wanted(dir)) | |
861 | mask |= CEPH_CAP_XATTR_SHARED; | |
862 | req->r_args.getattr.mask = cpu_to_le32(mask); | |
863 | ||
4c183472 | 864 | ihold(dir); |
3dd69aab JL |
865 | req->r_parent = dir; |
866 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); | |
2817b000 | 867 | err = ceph_mdsc_do_request(mdsc, NULL, req); |
7a971e2c JL |
868 | if (err == -ENOENT) { |
869 | struct dentry *res; | |
870 | ||
871 | res = ceph_handle_snapdir(req, dentry); | |
872 | if (IS_ERR(res)) { | |
873 | err = PTR_ERR(res); | |
874 | } else { | |
875 | dentry = res; | |
876 | err = 0; | |
877 | } | |
aa60cfc3 | 878 | } |
2817b000 SW |
879 | dentry = ceph_finish_lookup(req, dentry, err); |
880 | ceph_mdsc_put_request(req); /* will dput(dentry) */ | |
38d46409 | 881 | doutc(cl, "result=%p\n", dentry); |
2817b000 SW |
882 | return dentry; |
883 | } | |
884 | ||
885 | /* | |
886 | * If we do a create but get no trace back from the MDS, follow up with | |
887 | * a lookup (the VFS expects us to link up the provided dentry). | |
888 | */ | |
889 | int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry) | |
890 | { | |
00cd8dd3 | 891 | struct dentry *result = ceph_lookup(dir, dentry, 0); |
2817b000 SW |
892 | |
893 | if (result && !IS_ERR(result)) { | |
894 | /* | |
895 | * We created the item, then did a lookup, and found | |
896 | * it was already linked to another inode we already | |
4d41cef2 YZ |
897 | * had in our cache (and thus got spliced). To not |
898 | * confuse VFS (especially when inode is a directory), | |
899 | * we don't link our dentry to that inode, return an | |
900 | * error instead. | |
901 | * | |
902 | * This event should be rare and it happens only when | |
903 | * we talk to old MDS. Recent MDS does not send traceless | |
904 | * reply for request that creates new inode. | |
2817b000 | 905 | */ |
5cba372c | 906 | d_drop(result); |
4d41cef2 | 907 | return -ESTALE; |
2817b000 SW |
908 | } |
909 | return PTR_ERR(result); | |
910 | } | |
911 | ||
5ebb29be | 912 | static int ceph_mknod(struct mnt_idmap *idmap, struct inode *dir, |
549c7297 | 913 | struct dentry *dentry, umode_t mode, dev_t rdev) |
2817b000 | 914 | { |
2678da88 | 915 | struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); |
38d46409 | 916 | struct ceph_client *cl = mdsc->fsc->client; |
2817b000 | 917 | struct ceph_mds_request *req; |
5c31e92d | 918 | struct ceph_acl_sec_ctx as_ctx = {}; |
2817b000 SW |
919 | int err; |
920 | ||
921 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
922 | return -EROFS; | |
923 | ||
4868e537 XL |
924 | err = ceph_wait_on_conflict_unlink(dentry); |
925 | if (err) | |
926 | return err; | |
927 | ||
0459871c CX |
928 | if (ceph_quota_is_max_files_exceeded(dir)) { |
929 | err = -EDQUOT; | |
930 | goto out; | |
931 | } | |
b7a29217 | 932 | |
38d46409 XL |
933 | doutc(cl, "%p %llx.%llx/'%pd' dentry %p mode 0%ho rdev %d\n", |
934 | dir, ceph_vinop(dir), dentry, dentry, mode, rdev); | |
2817b000 SW |
935 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS); |
936 | if (IS_ERR(req)) { | |
b1ee94aa YZ |
937 | err = PTR_ERR(req); |
938 | goto out; | |
2817b000 | 939 | } |
ec9595c0 JL |
940 | |
941 | req->r_new_inode = ceph_new_inode(dir, dentry, &mode, &as_ctx); | |
942 | if (IS_ERR(req->r_new_inode)) { | |
943 | err = PTR_ERR(req->r_new_inode); | |
944 | req->r_new_inode = NULL; | |
945 | goto out_req; | |
946 | } | |
947 | ||
16be62fc JL |
948 | if (S_ISREG(mode) && IS_ENCRYPTED(dir)) |
949 | set_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags); | |
950 | ||
2817b000 SW |
951 | req->r_dentry = dget(dentry); |
952 | req->r_num_caps = 2; | |
3dd69aab | 953 | req->r_parent = dir; |
4c183472 | 954 | ihold(dir); |
3dd69aab | 955 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); |
09838f1b | 956 | req->r_mnt_idmap = mnt_idmap_get(idmap); |
2817b000 SW |
957 | req->r_args.mknod.mode = cpu_to_le32(mode); |
958 | req->r_args.mknod.rdev = cpu_to_le32(rdev); | |
d9d00f71 XL |
959 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL | |
960 | CEPH_CAP_XATTR_EXCL; | |
2817b000 | 961 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
ec9595c0 JL |
962 | |
963 | ceph_as_ctx_to_req(req, &as_ctx); | |
964 | ||
2817b000 SW |
965 | err = ceph_mdsc_do_request(mdsc, dir, req); |
966 | if (!err && !req->r_reply_info.head->is_dentry) | |
967 | err = ceph_handle_notrace_create(dir, dentry); | |
ec9595c0 | 968 | out_req: |
2817b000 | 969 | ceph_mdsc_put_request(req); |
b1ee94aa | 970 | out: |
7221fe4c | 971 | if (!err) |
5c31e92d | 972 | ceph_init_inode_acls(d_inode(dentry), &as_ctx); |
b20a95a0 | 973 | else |
2817b000 | 974 | d_drop(dentry); |
5c31e92d | 975 | ceph_release_acl_sec_ctx(&as_ctx); |
2817b000 SW |
976 | return err; |
977 | } | |
978 | ||
6c960e68 | 979 | static int ceph_create(struct mnt_idmap *idmap, struct inode *dir, |
549c7297 | 980 | struct dentry *dentry, umode_t mode, bool excl) |
2817b000 | 981 | { |
5ebb29be | 982 | return ceph_mknod(idmap, dir, dentry, mode, 0); |
2817b000 SW |
983 | } |
984 | ||
79f2f6ad JL |
985 | #if IS_ENABLED(CONFIG_FS_ENCRYPTION) |
986 | static int prep_encrypted_symlink_target(struct ceph_mds_request *req, | |
987 | const char *dest) | |
988 | { | |
989 | int err; | |
990 | int len = strlen(dest); | |
991 | struct fscrypt_str osd_link = FSTR_INIT(NULL, 0); | |
992 | ||
993 | err = fscrypt_prepare_symlink(req->r_parent, dest, len, PATH_MAX, | |
994 | &osd_link); | |
995 | if (err) | |
996 | goto out; | |
997 | ||
998 | err = fscrypt_encrypt_symlink(req->r_new_inode, dest, len, &osd_link); | |
999 | if (err) | |
1000 | goto out; | |
1001 | ||
1002 | req->r_path2 = kmalloc(CEPH_BASE64_CHARS(osd_link.len) + 1, GFP_KERNEL); | |
1003 | if (!req->r_path2) { | |
1004 | err = -ENOMEM; | |
1005 | goto out; | |
1006 | } | |
1007 | ||
1008 | len = ceph_base64_encode(osd_link.name, osd_link.len, req->r_path2); | |
1009 | req->r_path2[len] = '\0'; | |
1010 | out: | |
1011 | fscrypt_fname_free_buffer(&osd_link); | |
1012 | return err; | |
1013 | } | |
1014 | #else | |
1015 | static int prep_encrypted_symlink_target(struct ceph_mds_request *req, | |
1016 | const char *dest) | |
1017 | { | |
1018 | return -EOPNOTSUPP; | |
1019 | } | |
1020 | #endif | |
1021 | ||
7a77db95 | 1022 | static int ceph_symlink(struct mnt_idmap *idmap, struct inode *dir, |
549c7297 | 1023 | struct dentry *dentry, const char *dest) |
2817b000 | 1024 | { |
2678da88 | 1025 | struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); |
38d46409 | 1026 | struct ceph_client *cl = mdsc->fsc->client; |
2817b000 | 1027 | struct ceph_mds_request *req; |
ac6713cc | 1028 | struct ceph_acl_sec_ctx as_ctx = {}; |
ec9595c0 | 1029 | umode_t mode = S_IFLNK | 0777; |
2817b000 SW |
1030 | int err; |
1031 | ||
1032 | if (ceph_snap(dir) != CEPH_NOSNAP) | |
1033 | return -EROFS; | |
1034 | ||
4868e537 XL |
1035 | err = ceph_wait_on_conflict_unlink(dentry); |
1036 | if (err) | |
1037 | return err; | |
1038 | ||
67fcd151 CX |
1039 | if (ceph_quota_is_max_files_exceeded(dir)) { |
1040 | err = -EDQUOT; | |
1041 | goto out; | |
1042 | } | |
b7a29217 | 1043 | |
38d46409 XL |
1044 | doutc(cl, "%p %llx.%llx/'%pd' to '%s'\n", dir, ceph_vinop(dir), dentry, |
1045 | dest); | |
2817b000 SW |
1046 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS); |
1047 | if (IS_ERR(req)) { | |
b1ee94aa YZ |
1048 | err = PTR_ERR(req); |
1049 | goto out; | |
2817b000 | 1050 | } |
ec9595c0 JL |
1051 | |
1052 | req->r_new_inode = ceph_new_inode(dir, dentry, &mode, &as_ctx); | |
1053 | if (IS_ERR(req->r_new_inode)) { | |
1054 | err = PTR_ERR(req->r_new_inode); | |
1055 | req->r_new_inode = NULL; | |
1056 | goto out_req; | |
1057 | } | |
1058 | ||
3dd69aab | 1059 | req->r_parent = dir; |
4c183472 JL |
1060 | ihold(dir); |
1061 | ||
79f2f6ad JL |
1062 | if (IS_ENCRYPTED(req->r_new_inode)) { |
1063 | err = prep_encrypted_symlink_target(req, dest); | |
1064 | if (err) | |
1065 | goto out_req; | |
1066 | } else { | |
1067 | req->r_path2 = kstrdup(dest, GFP_KERNEL); | |
1068 | if (!req->r_path2) { | |
1069 | err = -ENOMEM; | |
1070 | goto out_req; | |
1071 | } | |
1072 | } | |
1073 | ||
3dd69aab | 1074 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); |
09838f1b | 1075 | req->r_mnt_idmap = mnt_idmap_get(idmap); |
a149bb9a SK |
1076 | req->r_dentry = dget(dentry); |
1077 | req->r_num_caps = 2; | |
d9d00f71 XL |
1078 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL | |
1079 | CEPH_CAP_XATTR_EXCL; | |
2817b000 | 1080 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
ec9595c0 JL |
1081 | |
1082 | ceph_as_ctx_to_req(req, &as_ctx); | |
1083 | ||
2817b000 SW |
1084 | err = ceph_mdsc_do_request(mdsc, dir, req); |
1085 | if (!err && !req->r_reply_info.head->is_dentry) | |
1086 | err = ceph_handle_notrace_create(dir, dentry); | |
ec9595c0 | 1087 | out_req: |
2817b000 | 1088 | ceph_mdsc_put_request(req); |
b1ee94aa YZ |
1089 | out: |
1090 | if (err) | |
2817b000 | 1091 | d_drop(dentry); |
ac6713cc | 1092 | ceph_release_acl_sec_ctx(&as_ctx); |
2817b000 SW |
1093 | return err; |
1094 | } | |
1095 | ||
c54bd91e | 1096 | static int ceph_mkdir(struct mnt_idmap *idmap, struct inode *dir, |
549c7297 | 1097 | struct dentry *dentry, umode_t mode) |
2817b000 | 1098 | { |
2678da88 | 1099 | struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); |
38d46409 | 1100 | struct ceph_client *cl = mdsc->fsc->client; |
2817b000 | 1101 | struct ceph_mds_request *req; |
5c31e92d | 1102 | struct ceph_acl_sec_ctx as_ctx = {}; |
4868e537 | 1103 | int err; |
2817b000 SW |
1104 | int op; |
1105 | ||
4868e537 XL |
1106 | err = ceph_wait_on_conflict_unlink(dentry); |
1107 | if (err) | |
1108 | return err; | |
1109 | ||
2817b000 SW |
1110 | if (ceph_snap(dir) == CEPH_SNAPDIR) { |
1111 | /* mkdir .snap/foo is a MKSNAP */ | |
1112 | op = CEPH_MDS_OP_MKSNAP; | |
38d46409 XL |
1113 | doutc(cl, "mksnap %llx.%llx/'%pd' dentry %p\n", |
1114 | ceph_vinop(dir), dentry, dentry); | |
2817b000 | 1115 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { |
38d46409 XL |
1116 | doutc(cl, "mkdir %llx.%llx/'%pd' dentry %p mode 0%ho\n", |
1117 | ceph_vinop(dir), dentry, dentry, mode); | |
2817b000 SW |
1118 | op = CEPH_MDS_OP_MKDIR; |
1119 | } else { | |
4868e537 | 1120 | err = -EROFS; |
2817b000 SW |
1121 | goto out; |
1122 | } | |
b1ee94aa | 1123 | |
25963669 YZ |
1124 | if (op == CEPH_MDS_OP_MKDIR && |
1125 | ceph_quota_is_max_files_exceeded(dir)) { | |
b7a29217 LH |
1126 | err = -EDQUOT; |
1127 | goto out; | |
1128 | } | |
abd4fc77 LH |
1129 | if ((op == CEPH_MDS_OP_MKSNAP) && IS_ENCRYPTED(dir) && |
1130 | !fscrypt_has_encryption_key(dir)) { | |
1131 | err = -ENOKEY; | |
1132 | goto out; | |
1133 | } | |
b7a29217 | 1134 | |
b1ee94aa | 1135 | |
2817b000 SW |
1136 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); |
1137 | if (IS_ERR(req)) { | |
1138 | err = PTR_ERR(req); | |
1139 | goto out; | |
1140 | } | |
1141 | ||
ec9595c0 JL |
1142 | mode |= S_IFDIR; |
1143 | req->r_new_inode = ceph_new_inode(dir, dentry, &mode, &as_ctx); | |
1144 | if (IS_ERR(req->r_new_inode)) { | |
1145 | err = PTR_ERR(req->r_new_inode); | |
1146 | req->r_new_inode = NULL; | |
1147 | goto out_req; | |
1148 | } | |
1149 | ||
2817b000 SW |
1150 | req->r_dentry = dget(dentry); |
1151 | req->r_num_caps = 2; | |
3dd69aab | 1152 | req->r_parent = dir; |
4c183472 | 1153 | ihold(dir); |
3dd69aab | 1154 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); |
09838f1b CB |
1155 | if (op == CEPH_MDS_OP_MKDIR) |
1156 | req->r_mnt_idmap = mnt_idmap_get(idmap); | |
2817b000 | 1157 | req->r_args.mkdir.mode = cpu_to_le32(mode); |
d9d00f71 XL |
1158 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL | |
1159 | CEPH_CAP_XATTR_EXCL; | |
2817b000 | 1160 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
ec9595c0 JL |
1161 | |
1162 | ceph_as_ctx_to_req(req, &as_ctx); | |
1163 | ||
2817b000 | 1164 | err = ceph_mdsc_do_request(mdsc, dir, req); |
275dd19e YZ |
1165 | if (!err && |
1166 | !req->r_reply_info.head->is_target && | |
1167 | !req->r_reply_info.head->is_dentry) | |
2817b000 | 1168 | err = ceph_handle_notrace_create(dir, dentry); |
ec9595c0 | 1169 | out_req: |
2817b000 SW |
1170 | ceph_mdsc_put_request(req); |
1171 | out: | |
b20a95a0 | 1172 | if (!err) |
5c31e92d | 1173 | ceph_init_inode_acls(d_inode(dentry), &as_ctx); |
b20a95a0 | 1174 | else |
2817b000 | 1175 | d_drop(dentry); |
5c31e92d | 1176 | ceph_release_acl_sec_ctx(&as_ctx); |
2817b000 SW |
1177 | return err; |
1178 | } | |
1179 | ||
1180 | static int ceph_link(struct dentry *old_dentry, struct inode *dir, | |
1181 | struct dentry *dentry) | |
1182 | { | |
2678da88 | 1183 | struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); |
38d46409 | 1184 | struct ceph_client *cl = mdsc->fsc->client; |
2817b000 SW |
1185 | struct ceph_mds_request *req; |
1186 | int err; | |
1187 | ||
a5ffd7b6 XL |
1188 | if (dentry->d_flags & DCACHE_DISCONNECTED) |
1189 | return -EINVAL; | |
1190 | ||
4868e537 XL |
1191 | err = ceph_wait_on_conflict_unlink(dentry); |
1192 | if (err) | |
1193 | return err; | |
1194 | ||
2817b000 SW |
1195 | if (ceph_snap(dir) != CEPH_NOSNAP) |
1196 | return -EROFS; | |
1197 | ||
94af0470 JL |
1198 | err = fscrypt_prepare_link(old_dentry, dir, dentry); |
1199 | if (err) | |
1200 | return err; | |
1201 | ||
38d46409 XL |
1202 | doutc(cl, "%p %llx.%llx/'%pd' to '%pd'\n", dir, ceph_vinop(dir), |
1203 | old_dentry, dentry); | |
2817b000 SW |
1204 | req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS); |
1205 | if (IS_ERR(req)) { | |
1206 | d_drop(dentry); | |
1207 | return PTR_ERR(req); | |
1208 | } | |
1209 | req->r_dentry = dget(dentry); | |
1210 | req->r_num_caps = 2; | |
4b58c9b1 | 1211 | req->r_old_dentry = dget(old_dentry); |
a5ffd7b6 XL |
1212 | /* |
1213 | * The old_dentry maybe a DCACHE_DISCONNECTED dentry, then we | |
1214 | * will just pass the ino# to MDSs. | |
1215 | */ | |
1216 | if (old_dentry->d_flags & DCACHE_DISCONNECTED) | |
1217 | req->r_ino2 = ceph_vino(d_inode(old_dentry)); | |
3dd69aab | 1218 | req->r_parent = dir; |
4c183472 | 1219 | ihold(dir); |
3dd69aab | 1220 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); |
d9d00f71 | 1221 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_XATTR_EXCL; |
2817b000 | 1222 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
ad88f23f | 1223 | /* release LINK_SHARED on source inode (mds will lock it) */ |
d19a0b54 | 1224 | req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; |
2817b000 | 1225 | err = ceph_mdsc_do_request(mdsc, dir, req); |
70b666c3 | 1226 | if (err) { |
2817b000 | 1227 | d_drop(dentry); |
70b666c3 | 1228 | } else if (!req->r_reply_info.head->is_dentry) { |
2b0143b5 DH |
1229 | ihold(d_inode(old_dentry)); |
1230 | d_instantiate(dentry, d_inode(old_dentry)); | |
70b666c3 | 1231 | } |
2817b000 SW |
1232 | ceph_mdsc_put_request(req); |
1233 | return err; | |
1234 | } | |
1235 | ||
2ccb4546 JL |
1236 | static void ceph_async_unlink_cb(struct ceph_mds_client *mdsc, |
1237 | struct ceph_mds_request *req) | |
1238 | { | |
4868e537 | 1239 | struct dentry *dentry = req->r_dentry; |
5995d90d | 1240 | struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dentry->d_sb); |
38d46409 | 1241 | struct ceph_client *cl = fsc->client; |
4868e537 | 1242 | struct ceph_dentry_info *di = ceph_dentry(dentry); |
2ccb4546 JL |
1243 | int result = req->r_err ? req->r_err : |
1244 | le32_to_cpu(req->r_reply_info.head->result); | |
1245 | ||
4868e537 | 1246 | if (!test_bit(CEPH_DENTRY_ASYNC_UNLINK_BIT, &di->flags)) |
38d46409 XL |
1247 | pr_warn_client(cl, |
1248 | "dentry %p:%pd async unlink bit is not set\n", | |
1249 | dentry, dentry); | |
4868e537 XL |
1250 | |
1251 | spin_lock(&fsc->async_unlink_conflict_lock); | |
1252 | hash_del_rcu(&di->hnode); | |
1253 | spin_unlock(&fsc->async_unlink_conflict_lock); | |
1254 | ||
1255 | spin_lock(&dentry->d_lock); | |
1256 | di->flags &= ~CEPH_DENTRY_ASYNC_UNLINK; | |
1257 | wake_up_bit(&di->flags, CEPH_DENTRY_ASYNC_UNLINK_BIT); | |
1258 | spin_unlock(&dentry->d_lock); | |
1259 | ||
1260 | synchronize_rcu(); | |
1261 | ||
2ccb4546 JL |
1262 | if (result == -EJUKEBOX) |
1263 | goto out; | |
1264 | ||
1265 | /* If op failed, mark everyone involved for errors */ | |
1266 | if (result) { | |
2a575f13 JL |
1267 | int pathlen = 0; |
1268 | u64 base = 0; | |
197b7d79 | 1269 | char *path = ceph_mdsc_build_path(mdsc, dentry, &pathlen, |
2ccb4546 JL |
1270 | &base, 0); |
1271 | ||
1272 | /* mark error on parent + clear complete */ | |
1273 | mapping_set_error(req->r_parent->i_mapping, result); | |
1274 | ceph_dir_clear_complete(req->r_parent); | |
1275 | ||
1276 | /* drop the dentry -- we don't know its status */ | |
4868e537 XL |
1277 | if (!d_unhashed(dentry)) |
1278 | d_drop(dentry); | |
2ccb4546 JL |
1279 | |
1280 | /* mark inode itself for an error (since metadata is bogus) */ | |
1281 | mapping_set_error(req->r_old_inode->i_mapping, result); | |
1282 | ||
38d46409 XL |
1283 | pr_warn_client(cl, "failure path=(%llx)%s result=%d!\n", |
1284 | base, IS_ERR(path) ? "<<bad>>" : path, result); | |
2ccb4546 JL |
1285 | ceph_mdsc_free_path(path, pathlen); |
1286 | } | |
1287 | out: | |
1288 | iput(req->r_old_inode); | |
1289 | ceph_mdsc_release_dir_caps(req); | |
1290 | } | |
1291 | ||
1292 | static int get_caps_for_async_unlink(struct inode *dir, struct dentry *dentry) | |
1293 | { | |
1294 | struct ceph_inode_info *ci = ceph_inode(dir); | |
1295 | struct ceph_dentry_info *di; | |
1296 | int got = 0, want = CEPH_CAP_FILE_EXCL | CEPH_CAP_DIR_UNLINK; | |
1297 | ||
1298 | spin_lock(&ci->i_ceph_lock); | |
1299 | if ((__ceph_caps_issued(ci, NULL) & want) == want) { | |
1300 | ceph_take_cap_refs(ci, want, false); | |
1301 | got = want; | |
1302 | } | |
1303 | spin_unlock(&ci->i_ceph_lock); | |
1304 | ||
1305 | /* If we didn't get anything, return 0 */ | |
1306 | if (!got) | |
1307 | return 0; | |
1308 | ||
1309 | spin_lock(&dentry->d_lock); | |
1310 | di = ceph_dentry(dentry); | |
1311 | /* | |
1312 | * - We are holding Fx, which implies Fs caps. | |
1313 | * - Only support async unlink for primary linkage | |
1314 | */ | |
1315 | if (atomic_read(&ci->i_shared_gen) != di->lease_shared_gen || | |
1316 | !(di->flags & CEPH_DENTRY_PRIMARY_LINK)) | |
1317 | want = 0; | |
1318 | spin_unlock(&dentry->d_lock); | |
1319 | ||
1320 | /* Do we still want what we've got? */ | |
1321 | if (want == got) | |
1322 | return got; | |
1323 | ||
1324 | ceph_put_cap_refs(ci, got); | |
1325 | return 0; | |
1326 | } | |
1327 | ||
2817b000 SW |
1328 | /* |
1329 | * rmdir and unlink are differ only by the metadata op code | |
1330 | */ | |
1331 | static int ceph_unlink(struct inode *dir, struct dentry *dentry) | |
1332 | { | |
5995d90d | 1333 | struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dir->i_sb); |
38d46409 | 1334 | struct ceph_client *cl = fsc->client; |
3d14c5d2 | 1335 | struct ceph_mds_client *mdsc = fsc->mdsc; |
2b0143b5 | 1336 | struct inode *inode = d_inode(dentry); |
2817b000 | 1337 | struct ceph_mds_request *req; |
2ccb4546 | 1338 | bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS); |
2827bada | 1339 | struct dentry *dn; |
2817b000 SW |
1340 | int err = -EROFS; |
1341 | int op; | |
2827bada XL |
1342 | char *path; |
1343 | int pathlen; | |
1344 | u64 pathbase; | |
2817b000 SW |
1345 | |
1346 | if (ceph_snap(dir) == CEPH_SNAPDIR) { | |
1347 | /* rmdir .snap/foo is RMSNAP */ | |
38d46409 XL |
1348 | doutc(cl, "rmsnap %llx.%llx/'%pd' dn\n", ceph_vinop(dir), |
1349 | dentry); | |
2817b000 SW |
1350 | op = CEPH_MDS_OP_RMSNAP; |
1351 | } else if (ceph_snap(dir) == CEPH_NOSNAP) { | |
38d46409 XL |
1352 | doutc(cl, "unlink/rmdir %llx.%llx/'%pd' inode %llx.%llx\n", |
1353 | ceph_vinop(dir), dentry, ceph_vinop(inode)); | |
e36cb0b8 | 1354 | op = d_is_dir(dentry) ? |
2817b000 SW |
1355 | CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK; |
1356 | } else | |
1357 | goto out; | |
2827bada XL |
1358 | |
1359 | dn = d_find_alias(dir); | |
1360 | if (!dn) { | |
1361 | try_async = false; | |
1362 | } else { | |
1363 | path = ceph_mdsc_build_path(mdsc, dn, &pathlen, &pathbase, 0); | |
1364 | if (IS_ERR(path)) { | |
1365 | try_async = false; | |
1366 | err = 0; | |
1367 | } else { | |
1368 | err = ceph_mds_check_access(mdsc, path, MAY_WRITE); | |
1369 | } | |
1370 | ceph_mdsc_free_path(path, pathlen); | |
1371 | dput(dn); | |
1372 | ||
1373 | /* For none EACCES cases will let the MDS do the mds auth check */ | |
1374 | if (err == -EACCES) { | |
1375 | return err; | |
1376 | } else if (err < 0) { | |
1377 | try_async = false; | |
1378 | err = 0; | |
1379 | } | |
1380 | } | |
1381 | ||
2ccb4546 | 1382 | retry: |
2817b000 SW |
1383 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); |
1384 | if (IS_ERR(req)) { | |
1385 | err = PTR_ERR(req); | |
1386 | goto out; | |
1387 | } | |
1388 | req->r_dentry = dget(dentry); | |
1389 | req->r_num_caps = 2; | |
3dd69aab | 1390 | req->r_parent = dir; |
4c183472 | 1391 | ihold(dir); |
d9d00f71 | 1392 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_XATTR_EXCL; |
2817b000 | 1393 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
6ef0bc6d | 1394 | req->r_inode_drop = ceph_drop_caps_for_unlink(inode); |
2ccb4546 JL |
1395 | |
1396 | if (try_async && op == CEPH_MDS_OP_UNLINK && | |
1397 | (req->r_dir_caps = get_caps_for_async_unlink(dir, dentry))) { | |
4868e537 XL |
1398 | struct ceph_dentry_info *di = ceph_dentry(dentry); |
1399 | ||
38d46409 XL |
1400 | doutc(cl, "async unlink on %llx.%llx/'%pd' caps=%s", |
1401 | ceph_vinop(dir), dentry, | |
1402 | ceph_cap_string(req->r_dir_caps)); | |
2ccb4546 JL |
1403 | set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags); |
1404 | req->r_callback = ceph_async_unlink_cb; | |
1405 | req->r_old_inode = d_inode(dentry); | |
1406 | ihold(req->r_old_inode); | |
4868e537 XL |
1407 | |
1408 | spin_lock(&dentry->d_lock); | |
1409 | di->flags |= CEPH_DENTRY_ASYNC_UNLINK; | |
1410 | spin_unlock(&dentry->d_lock); | |
1411 | ||
1412 | spin_lock(&fsc->async_unlink_conflict_lock); | |
1413 | hash_add_rcu(fsc->async_unlink_conflict, &di->hnode, | |
1414 | dentry->d_name.hash); | |
1415 | spin_unlock(&fsc->async_unlink_conflict_lock); | |
1416 | ||
2ccb4546 JL |
1417 | err = ceph_mdsc_submit_request(mdsc, dir, req); |
1418 | if (!err) { | |
1419 | /* | |
1420 | * We have enough caps, so we assume that the unlink | |
1421 | * will succeed. Fix up the target inode and dcache. | |
1422 | */ | |
1423 | drop_nlink(inode); | |
1424 | d_delete(dentry); | |
4868e537 XL |
1425 | } else { |
1426 | spin_lock(&fsc->async_unlink_conflict_lock); | |
1427 | hash_del_rcu(&di->hnode); | |
1428 | spin_unlock(&fsc->async_unlink_conflict_lock); | |
1429 | ||
1430 | spin_lock(&dentry->d_lock); | |
1431 | di->flags &= ~CEPH_DENTRY_ASYNC_UNLINK; | |
1432 | spin_unlock(&dentry->d_lock); | |
1433 | ||
1434 | if (err == -EJUKEBOX) { | |
1435 | try_async = false; | |
1436 | ceph_mdsc_put_request(req); | |
1437 | goto retry; | |
1438 | } | |
2ccb4546 JL |
1439 | } |
1440 | } else { | |
1441 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); | |
1442 | err = ceph_mdsc_do_request(mdsc, dir, req); | |
1443 | if (!err && !req->r_reply_info.head->is_dentry) | |
1444 | d_delete(dentry); | |
1445 | } | |
1446 | ||
2817b000 SW |
1447 | ceph_mdsc_put_request(req); |
1448 | out: | |
1449 | return err; | |
1450 | } | |
1451 | ||
e18275ae | 1452 | static int ceph_rename(struct mnt_idmap *idmap, struct inode *old_dir, |
549c7297 CB |
1453 | struct dentry *old_dentry, struct inode *new_dir, |
1454 | struct dentry *new_dentry, unsigned int flags) | |
2817b000 | 1455 | { |
2678da88 | 1456 | struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(old_dir->i_sb); |
38d46409 | 1457 | struct ceph_client *cl = mdsc->fsc->client; |
2817b000 | 1458 | struct ceph_mds_request *req; |
0ea611a3 | 1459 | int op = CEPH_MDS_OP_RENAME; |
2817b000 SW |
1460 | int err; |
1461 | ||
1cd66c93 MS |
1462 | if (flags) |
1463 | return -EINVAL; | |
1464 | ||
2817b000 SW |
1465 | if (ceph_snap(old_dir) != ceph_snap(new_dir)) |
1466 | return -EXDEV; | |
0ea611a3 YZ |
1467 | if (ceph_snap(old_dir) != CEPH_NOSNAP) { |
1468 | if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR) | |
1469 | op = CEPH_MDS_OP_RENAMESNAP; | |
1470 | else | |
1471 | return -EROFS; | |
1472 | } | |
6646ea1c LH |
1473 | /* don't allow cross-quota renames */ |
1474 | if ((old_dir != new_dir) && | |
1475 | (!ceph_quota_is_same_realm(old_dir, new_dir))) | |
1476 | return -EXDEV; | |
cafe21a4 | 1477 | |
4868e537 XL |
1478 | err = ceph_wait_on_conflict_unlink(new_dentry); |
1479 | if (err) | |
1480 | return err; | |
1481 | ||
94af0470 JL |
1482 | err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry, |
1483 | flags); | |
1484 | if (err) | |
1485 | return err; | |
1486 | ||
38d46409 XL |
1487 | doutc(cl, "%llx.%llx/'%pd' to %llx.%llx/'%pd'\n", |
1488 | ceph_vinop(old_dir), old_dentry, ceph_vinop(new_dir), | |
1489 | new_dentry); | |
0ea611a3 | 1490 | req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); |
2817b000 SW |
1491 | if (IS_ERR(req)) |
1492 | return PTR_ERR(req); | |
180061a5 | 1493 | ihold(old_dir); |
2817b000 SW |
1494 | req->r_dentry = dget(new_dentry); |
1495 | req->r_num_caps = 2; | |
1496 | req->r_old_dentry = dget(old_dentry); | |
180061a5 | 1497 | req->r_old_dentry_dir = old_dir; |
3dd69aab | 1498 | req->r_parent = new_dir; |
4c183472 | 1499 | ihold(new_dir); |
3dd69aab | 1500 | set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); |
d9d00f71 | 1501 | req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_XATTR_EXCL; |
2817b000 | 1502 | req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL; |
d9d00f71 | 1503 | req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_XATTR_EXCL; |
2817b000 SW |
1504 | req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
1505 | /* release LINK_RDCACHE on source inode (mds will lock it) */ | |
d19a0b54 | 1506 | req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; |
6ef0bc6d ZZ |
1507 | if (d_really_is_positive(new_dentry)) { |
1508 | req->r_inode_drop = | |
1509 | ceph_drop_caps_for_unlink(d_inode(new_dentry)); | |
1510 | } | |
2817b000 SW |
1511 | err = ceph_mdsc_do_request(mdsc, old_dir, req); |
1512 | if (!err && !req->r_reply_info.head->is_dentry) { | |
1513 | /* | |
1514 | * Normally d_move() is done by fill_trace (called by | |
1515 | * do_request, above). If there is no trace, we need | |
1516 | * to do it here. | |
1517 | */ | |
1518 | d_move(old_dentry, new_dentry); | |
1519 | } | |
1520 | ceph_mdsc_put_request(req); | |
1521 | return err; | |
1522 | } | |
1523 | ||
37c4efc1 YZ |
1524 | /* |
1525 | * Move dentry to tail of mdsc->dentry_leases list when lease is updated. | |
1526 | * Leases at front of the list will expire first. (Assume all leases have | |
1527 | * similar duration) | |
1528 | * | |
1529 | * Called under dentry->d_lock. | |
1530 | */ | |
1531 | void __ceph_dentry_lease_touch(struct ceph_dentry_info *di) | |
1532 | { | |
1533 | struct dentry *dn = di->dentry; | |
38d46409 XL |
1534 | struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(dn->d_sb)->mdsc; |
1535 | struct ceph_client *cl = mdsc->fsc->client; | |
37c4efc1 | 1536 | |
38d46409 | 1537 | doutc(cl, "%p %p '%pd'\n", di, dn, dn); |
37c4efc1 YZ |
1538 | |
1539 | di->flags |= CEPH_DENTRY_LEASE_LIST; | |
1540 | if (di->flags & CEPH_DENTRY_SHRINK_LIST) { | |
1541 | di->flags |= CEPH_DENTRY_REFERENCED; | |
1542 | return; | |
1543 | } | |
1544 | ||
37c4efc1 YZ |
1545 | spin_lock(&mdsc->dentry_list_lock); |
1546 | list_move_tail(&di->lease_list, &mdsc->dentry_leases); | |
1547 | spin_unlock(&mdsc->dentry_list_lock); | |
1548 | } | |
1549 | ||
1550 | static void __dentry_dir_lease_touch(struct ceph_mds_client* mdsc, | |
1551 | struct ceph_dentry_info *di) | |
1552 | { | |
1553 | di->flags &= ~(CEPH_DENTRY_LEASE_LIST | CEPH_DENTRY_REFERENCED); | |
1554 | di->lease_gen = 0; | |
1555 | di->time = jiffies; | |
1556 | list_move_tail(&di->lease_list, &mdsc->dentry_dir_leases); | |
1557 | } | |
1558 | ||
1559 | /* | |
1560 | * When dir lease is used, add dentry to tail of mdsc->dentry_dir_leases | |
1561 | * list if it's not in the list, otherwise set 'referenced' flag. | |
1562 | * | |
1563 | * Called under dentry->d_lock. | |
1564 | */ | |
1565 | void __ceph_dentry_dir_lease_touch(struct ceph_dentry_info *di) | |
1566 | { | |
1567 | struct dentry *dn = di->dentry; | |
38d46409 XL |
1568 | struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(dn->d_sb)->mdsc; |
1569 | struct ceph_client *cl = mdsc->fsc->client; | |
37c4efc1 | 1570 | |
38d46409 | 1571 | doutc(cl, "%p %p '%pd' (offset 0x%llx)\n", di, dn, dn, di->offset); |
37c4efc1 YZ |
1572 | |
1573 | if (!list_empty(&di->lease_list)) { | |
1574 | if (di->flags & CEPH_DENTRY_LEASE_LIST) { | |
1575 | /* don't remove dentry from dentry lease list | |
1576 | * if its lease is valid */ | |
1577 | if (__dentry_lease_is_valid(di)) | |
1578 | return; | |
1579 | } else { | |
1580 | di->flags |= CEPH_DENTRY_REFERENCED; | |
1581 | return; | |
1582 | } | |
1583 | } | |
1584 | ||
1585 | if (di->flags & CEPH_DENTRY_SHRINK_LIST) { | |
1586 | di->flags |= CEPH_DENTRY_REFERENCED; | |
1587 | di->flags &= ~CEPH_DENTRY_LEASE_LIST; | |
1588 | return; | |
1589 | } | |
1590 | ||
37c4efc1 YZ |
1591 | spin_lock(&mdsc->dentry_list_lock); |
1592 | __dentry_dir_lease_touch(mdsc, di), | |
1593 | spin_unlock(&mdsc->dentry_list_lock); | |
1594 | } | |
1595 | ||
1596 | static void __dentry_lease_unlist(struct ceph_dentry_info *di) | |
1597 | { | |
1598 | struct ceph_mds_client *mdsc; | |
1599 | if (di->flags & CEPH_DENTRY_SHRINK_LIST) | |
1600 | return; | |
1601 | if (list_empty(&di->lease_list)) | |
1602 | return; | |
1603 | ||
5995d90d | 1604 | mdsc = ceph_sb_to_fs_client(di->dentry->d_sb)->mdsc; |
37c4efc1 YZ |
1605 | spin_lock(&mdsc->dentry_list_lock); |
1606 | list_del_init(&di->lease_list); | |
1607 | spin_unlock(&mdsc->dentry_list_lock); | |
1608 | } | |
1609 | ||
1610 | enum { | |
1611 | KEEP = 0, | |
1612 | DELETE = 1, | |
1613 | TOUCH = 2, | |
1614 | STOP = 4, | |
1615 | }; | |
1616 | ||
1617 | struct ceph_lease_walk_control { | |
1618 | bool dir_lease; | |
fe33032d | 1619 | bool expire_dir_lease; |
37c4efc1 YZ |
1620 | unsigned long nr_to_scan; |
1621 | unsigned long dir_lease_ttl; | |
1622 | }; | |
1623 | ||
2a965d1b AV |
1624 | static int __dir_lease_check(const struct dentry *, struct ceph_lease_walk_control *); |
1625 | static int __dentry_lease_check(const struct dentry *); | |
1626 | ||
37c4efc1 YZ |
1627 | static unsigned long |
1628 | __dentry_leases_walk(struct ceph_mds_client *mdsc, | |
2a965d1b | 1629 | struct ceph_lease_walk_control *lwc) |
37c4efc1 YZ |
1630 | { |
1631 | struct ceph_dentry_info *di, *tmp; | |
1632 | struct dentry *dentry, *last = NULL; | |
1633 | struct list_head* list; | |
1634 | LIST_HEAD(dispose); | |
1635 | unsigned long freed = 0; | |
1636 | int ret = 0; | |
1637 | ||
1638 | list = lwc->dir_lease ? &mdsc->dentry_dir_leases : &mdsc->dentry_leases; | |
1639 | spin_lock(&mdsc->dentry_list_lock); | |
1640 | list_for_each_entry_safe(di, tmp, list, lease_list) { | |
1641 | if (!lwc->nr_to_scan) | |
1642 | break; | |
1643 | --lwc->nr_to_scan; | |
1644 | ||
1645 | dentry = di->dentry; | |
1646 | if (last == dentry) | |
1647 | break; | |
1648 | ||
1649 | if (!spin_trylock(&dentry->d_lock)) | |
1650 | continue; | |
1651 | ||
516162b9 | 1652 | if (__lockref_is_dead(&dentry->d_lockref)) { |
37c4efc1 YZ |
1653 | list_del_init(&di->lease_list); |
1654 | goto next; | |
1655 | } | |
1656 | ||
2a965d1b AV |
1657 | if (lwc->dir_lease) |
1658 | ret = __dir_lease_check(dentry, lwc); | |
1659 | else | |
1660 | ret = __dentry_lease_check(dentry); | |
37c4efc1 YZ |
1661 | if (ret & TOUCH) { |
1662 | /* move it into tail of dir lease list */ | |
1663 | __dentry_dir_lease_touch(mdsc, di); | |
1664 | if (!last) | |
1665 | last = dentry; | |
1666 | } | |
1667 | if (ret & DELETE) { | |
1668 | /* stale lease */ | |
1669 | di->flags &= ~CEPH_DENTRY_REFERENCED; | |
1670 | if (dentry->d_lockref.count > 0) { | |
1671 | /* update_dentry_lease() will re-add | |
1672 | * it to lease list, or | |
1673 | * ceph_d_delete() will return 1 when | |
1674 | * last reference is dropped */ | |
1675 | list_del_init(&di->lease_list); | |
1676 | } else { | |
1677 | di->flags |= CEPH_DENTRY_SHRINK_LIST; | |
1678 | list_move_tail(&di->lease_list, &dispose); | |
1679 | dget_dlock(dentry); | |
1680 | } | |
1681 | } | |
1682 | next: | |
1683 | spin_unlock(&dentry->d_lock); | |
1684 | if (ret & STOP) | |
1685 | break; | |
1686 | } | |
1687 | spin_unlock(&mdsc->dentry_list_lock); | |
1688 | ||
1689 | while (!list_empty(&dispose)) { | |
1690 | di = list_first_entry(&dispose, struct ceph_dentry_info, | |
1691 | lease_list); | |
1692 | dentry = di->dentry; | |
1693 | spin_lock(&dentry->d_lock); | |
1694 | ||
1695 | list_del_init(&di->lease_list); | |
1696 | di->flags &= ~CEPH_DENTRY_SHRINK_LIST; | |
1697 | if (di->flags & CEPH_DENTRY_REFERENCED) { | |
1698 | spin_lock(&mdsc->dentry_list_lock); | |
1699 | if (di->flags & CEPH_DENTRY_LEASE_LIST) { | |
1700 | list_add_tail(&di->lease_list, | |
1701 | &mdsc->dentry_leases); | |
1702 | } else { | |
1703 | __dentry_dir_lease_touch(mdsc, di); | |
1704 | } | |
1705 | spin_unlock(&mdsc->dentry_list_lock); | |
1706 | } else { | |
1707 | freed++; | |
1708 | } | |
1709 | ||
1710 | spin_unlock(&dentry->d_lock); | |
1711 | /* ceph_d_delete() does the trick */ | |
1712 | dput(dentry); | |
1713 | } | |
1714 | return freed; | |
1715 | } | |
1716 | ||
2a965d1b | 1717 | static int __dentry_lease_check(const struct dentry *dentry) |
37c4efc1 YZ |
1718 | { |
1719 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
1720 | int ret; | |
1721 | ||
1722 | if (__dentry_lease_is_valid(di)) | |
1723 | return STOP; | |
1724 | ret = __dir_lease_try_check(dentry); | |
1725 | if (ret == -EBUSY) | |
1726 | return KEEP; | |
1727 | if (ret > 0) | |
1728 | return TOUCH; | |
1729 | return DELETE; | |
1730 | } | |
1731 | ||
2a965d1b AV |
1732 | static int __dir_lease_check(const struct dentry *dentry, |
1733 | struct ceph_lease_walk_control *lwc) | |
37c4efc1 | 1734 | { |
37c4efc1 YZ |
1735 | struct ceph_dentry_info *di = ceph_dentry(dentry); |
1736 | ||
1737 | int ret = __dir_lease_try_check(dentry); | |
1738 | if (ret == -EBUSY) | |
1739 | return KEEP; | |
1740 | if (ret > 0) { | |
1741 | if (time_before(jiffies, di->time + lwc->dir_lease_ttl)) | |
1742 | return STOP; | |
1743 | /* Move dentry to tail of dir lease list if we don't want | |
1744 | * to delete it. So dentries in the list are checked in a | |
1745 | * round robin manner */ | |
fe33032d YZ |
1746 | if (!lwc->expire_dir_lease) |
1747 | return TOUCH; | |
1748 | if (dentry->d_lockref.count > 0 || | |
1749 | (di->flags & CEPH_DENTRY_REFERENCED)) | |
1750 | return TOUCH; | |
1751 | /* invalidate dir lease */ | |
1752 | di->lease_shared_gen = 0; | |
37c4efc1 YZ |
1753 | } |
1754 | return DELETE; | |
1755 | } | |
1756 | ||
1757 | int ceph_trim_dentries(struct ceph_mds_client *mdsc) | |
1758 | { | |
1759 | struct ceph_lease_walk_control lwc; | |
fe33032d | 1760 | unsigned long count; |
37c4efc1 YZ |
1761 | unsigned long freed; |
1762 | ||
fe33032d YZ |
1763 | spin_lock(&mdsc->caps_list_lock); |
1764 | if (mdsc->caps_use_max > 0 && | |
1765 | mdsc->caps_use_count > mdsc->caps_use_max) | |
1766 | count = mdsc->caps_use_count - mdsc->caps_use_max; | |
1767 | else | |
1768 | count = 0; | |
1769 | spin_unlock(&mdsc->caps_list_lock); | |
1770 | ||
37c4efc1 YZ |
1771 | lwc.dir_lease = false; |
1772 | lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE * 2; | |
2a965d1b | 1773 | freed = __dentry_leases_walk(mdsc, &lwc); |
37c4efc1 YZ |
1774 | if (!lwc.nr_to_scan) /* more invalid leases */ |
1775 | return -EAGAIN; | |
1776 | ||
1777 | if (lwc.nr_to_scan < CEPH_CAPS_PER_RELEASE) | |
1778 | lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE; | |
1779 | ||
1780 | lwc.dir_lease = true; | |
fe33032d YZ |
1781 | lwc.expire_dir_lease = freed < count; |
1782 | lwc.dir_lease_ttl = mdsc->fsc->mount_options->caps_wanted_delay_max * HZ; | |
2a965d1b | 1783 | freed +=__dentry_leases_walk(mdsc, &lwc); |
37c4efc1 YZ |
1784 | if (!lwc.nr_to_scan) /* more to check */ |
1785 | return -EAGAIN; | |
1786 | ||
1787 | return freed > 0 ? 1 : 0; | |
1788 | } | |
1789 | ||
81a6cf2d SW |
1790 | /* |
1791 | * Ensure a dentry lease will no longer revalidate. | |
1792 | */ | |
1793 | void ceph_invalidate_dentry_lease(struct dentry *dentry) | |
1794 | { | |
37c4efc1 | 1795 | struct ceph_dentry_info *di = ceph_dentry(dentry); |
81a6cf2d | 1796 | spin_lock(&dentry->d_lock); |
37c4efc1 YZ |
1797 | di->time = jiffies; |
1798 | di->lease_shared_gen = 0; | |
f5e17aed | 1799 | di->flags &= ~CEPH_DENTRY_PRIMARY_LINK; |
37c4efc1 | 1800 | __dentry_lease_unlist(di); |
81a6cf2d SW |
1801 | spin_unlock(&dentry->d_lock); |
1802 | } | |
2817b000 SW |
1803 | |
1804 | /* | |
1805 | * Check if dentry lease is valid. If not, delete the lease. Try to | |
1806 | * renew if the least is more than half up. | |
1807 | */ | |
1e9c2eb6 YZ |
1808 | static bool __dentry_lease_is_valid(struct ceph_dentry_info *di) |
1809 | { | |
1810 | struct ceph_mds_session *session; | |
1811 | ||
1812 | if (!di->lease_gen) | |
1813 | return false; | |
1814 | ||
1815 | session = di->lease_session; | |
1816 | if (session) { | |
1817 | u32 gen; | |
1818 | unsigned long ttl; | |
1819 | ||
52d60f8e | 1820 | gen = atomic_read(&session->s_cap_gen); |
1e9c2eb6 | 1821 | ttl = session->s_cap_ttl; |
1e9c2eb6 YZ |
1822 | |
1823 | if (di->lease_gen == gen && | |
1824 | time_before(jiffies, ttl) && | |
1825 | time_before(jiffies, di->time)) | |
1826 | return true; | |
1827 | } | |
1828 | di->lease_gen = 0; | |
1829 | return false; | |
1830 | } | |
1831 | ||
8f2a98ef | 1832 | static int dentry_lease_is_valid(struct dentry *dentry, unsigned int flags) |
2817b000 SW |
1833 | { |
1834 | struct ceph_dentry_info *di; | |
2817b000 | 1835 | struct ceph_mds_session *session = NULL; |
38d46409 XL |
1836 | struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(dentry->d_sb)->mdsc; |
1837 | struct ceph_client *cl = mdsc->fsc->client; | |
2817b000 | 1838 | u32 seq = 0; |
1e9c2eb6 | 1839 | int valid = 0; |
2817b000 SW |
1840 | |
1841 | spin_lock(&dentry->d_lock); | |
1842 | di = ceph_dentry(dentry); | |
1e9c2eb6 YZ |
1843 | if (di && __dentry_lease_is_valid(di)) { |
1844 | valid = 1; | |
2817b000 | 1845 | |
1e9c2eb6 YZ |
1846 | if (di->lease_renew_after && |
1847 | time_after(jiffies, di->lease_renew_after)) { | |
1848 | /* | |
1849 | * We should renew. If we're in RCU walk mode | |
1850 | * though, we can't do that so just return | |
1851 | * -ECHILD. | |
1852 | */ | |
1853 | if (flags & LOOKUP_RCU) { | |
1854 | valid = -ECHILD; | |
1855 | } else { | |
1856 | session = ceph_get_mds_session(di->lease_session); | |
1857 | seq = di->lease_seq; | |
1858 | di->lease_renew_after = 0; | |
1859 | di->lease_renew_from = jiffies; | |
2817b000 | 1860 | } |
2817b000 SW |
1861 | } |
1862 | } | |
1863 | spin_unlock(&dentry->d_lock); | |
1864 | ||
1865 | if (session) { | |
8f2a98ef | 1866 | ceph_mdsc_lease_send_msg(session, dentry, |
2817b000 SW |
1867 | CEPH_MDS_LEASE_RENEW, seq); |
1868 | ceph_put_mds_session(session); | |
1869 | } | |
38d46409 | 1870 | doutc(cl, "dentry %p = %d\n", dentry, valid); |
2817b000 SW |
1871 | return valid; |
1872 | } | |
1873 | ||
1e9c2eb6 YZ |
1874 | /* |
1875 | * Called under dentry->d_lock. | |
1876 | */ | |
1877 | static int __dir_lease_try_check(const struct dentry *dentry) | |
1878 | { | |
1879 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
1880 | struct inode *dir; | |
1881 | struct ceph_inode_info *ci; | |
1882 | int valid = 0; | |
1883 | ||
1884 | if (!di->lease_shared_gen) | |
1885 | return 0; | |
1886 | if (IS_ROOT(dentry)) | |
1887 | return 0; | |
1888 | ||
1889 | dir = d_inode(dentry->d_parent); | |
1890 | ci = ceph_inode(dir); | |
1891 | ||
1892 | if (spin_trylock(&ci->i_ceph_lock)) { | |
1893 | if (atomic_read(&ci->i_shared_gen) == di->lease_shared_gen && | |
1894 | __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 0)) | |
1895 | valid = 1; | |
1896 | spin_unlock(&ci->i_ceph_lock); | |
1897 | } else { | |
1898 | valid = -EBUSY; | |
1899 | } | |
1900 | ||
1901 | if (!valid) | |
1902 | di->lease_shared_gen = 0; | |
1903 | return valid; | |
1904 | } | |
1905 | ||
2817b000 SW |
1906 | /* |
1907 | * Check if directory-wide content lease/cap is valid. | |
1908 | */ | |
719a2514 YZ |
1909 | static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry, |
1910 | struct ceph_mds_client *mdsc) | |
2817b000 SW |
1911 | { |
1912 | struct ceph_inode_info *ci = ceph_inode(dir); | |
38d46409 | 1913 | struct ceph_client *cl = mdsc->fsc->client; |
feab6ac2 YZ |
1914 | int valid; |
1915 | int shared_gen; | |
2817b000 | 1916 | |
be655596 | 1917 | spin_lock(&ci->i_ceph_lock); |
feab6ac2 | 1918 | valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1); |
719a2514 YZ |
1919 | if (valid) { |
1920 | __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_RD); | |
1921 | shared_gen = atomic_read(&ci->i_shared_gen); | |
1922 | } | |
be655596 | 1923 | spin_unlock(&ci->i_ceph_lock); |
feab6ac2 YZ |
1924 | if (valid) { |
1925 | struct ceph_dentry_info *di; | |
1926 | spin_lock(&dentry->d_lock); | |
1927 | di = ceph_dentry(dentry); | |
1928 | if (dir == d_inode(dentry->d_parent) && | |
1929 | di && di->lease_shared_gen == shared_gen) | |
1930 | __ceph_dentry_dir_lease_touch(di); | |
1931 | else | |
1932 | valid = 0; | |
1933 | spin_unlock(&dentry->d_lock); | |
1934 | } | |
38d46409 XL |
1935 | doutc(cl, "dir %p %llx.%llx v%u dentry %p '%pd' = %d\n", dir, |
1936 | ceph_vinop(dir), (unsigned)atomic_read(&ci->i_shared_gen), | |
1937 | dentry, dentry, valid); | |
2817b000 SW |
1938 | return valid; |
1939 | } | |
1940 | ||
1941 | /* | |
1942 | * Check if cached dentry can be trusted. | |
1943 | */ | |
0b728e19 | 1944 | static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags) |
2817b000 | 1945 | { |
38d46409 XL |
1946 | struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(dentry->d_sb)->mdsc; |
1947 | struct ceph_client *cl = mdsc->fsc->client; | |
bf1c6aca | 1948 | int valid = 0; |
641235d8 | 1949 | struct dentry *parent; |
aa8dd816 | 1950 | struct inode *dir, *inode; |
34286d66 | 1951 | |
c5267601 JL |
1952 | valid = fscrypt_d_revalidate(dentry, flags); |
1953 | if (valid <= 0) | |
1954 | return valid; | |
1955 | ||
f49d1e05 | 1956 | if (flags & LOOKUP_RCU) { |
52953d55 | 1957 | parent = READ_ONCE(dentry->d_parent); |
f49d1e05 JL |
1958 | dir = d_inode_rcu(parent); |
1959 | if (!dir) | |
1960 | return -ECHILD; | |
aa8dd816 | 1961 | inode = d_inode_rcu(dentry); |
f49d1e05 JL |
1962 | } else { |
1963 | parent = dget_parent(dentry); | |
1964 | dir = d_inode(parent); | |
aa8dd816 | 1965 | inode = d_inode(dentry); |
f49d1e05 | 1966 | } |
34286d66 | 1967 | |
38d46409 XL |
1968 | doutc(cl, "%p '%pd' inode %p offset 0x%llx nokey %d\n", |
1969 | dentry, dentry, inode, ceph_dentry(dentry)->offset, | |
1970 | !!(dentry->d_flags & DCACHE_NOKEY_NAME)); | |
2817b000 | 1971 | |
5995d90d | 1972 | mdsc = ceph_sb_to_fs_client(dir->i_sb)->mdsc; |
719a2514 | 1973 | |
2817b000 SW |
1974 | /* always trust cached snapped dentries, snapdir dentry */ |
1975 | if (ceph_snap(dir) != CEPH_NOSNAP) { | |
38d46409 XL |
1976 | doutc(cl, "%p '%pd' inode %p is SNAPPED\n", dentry, |
1977 | dentry, inode); | |
bf1c6aca | 1978 | valid = 1; |
aa8dd816 | 1979 | } else if (inode && ceph_snap(inode) == CEPH_SNAPDIR) { |
bf1c6aca | 1980 | valid = 1; |
14fb9c9e | 1981 | } else { |
8f2a98ef | 1982 | valid = dentry_lease_is_valid(dentry, flags); |
14fb9c9e JL |
1983 | if (valid == -ECHILD) |
1984 | return valid; | |
719a2514 | 1985 | if (valid || dir_lease_is_valid(dir, dentry, mdsc)) { |
aa8dd816 AV |
1986 | if (inode) |
1987 | valid = ceph_is_any_caps(inode); | |
14fb9c9e JL |
1988 | else |
1989 | valid = 1; | |
1990 | } | |
2817b000 | 1991 | } |
2817b000 | 1992 | |
200fd27c | 1993 | if (!valid) { |
200fd27c | 1994 | struct ceph_mds_request *req; |
1097680d JL |
1995 | int op, err; |
1996 | u32 mask; | |
200fd27c | 1997 | |
f49d1e05 JL |
1998 | if (flags & LOOKUP_RCU) |
1999 | return -ECHILD; | |
2000 | ||
f9009efa XL |
2001 | percpu_counter_inc(&mdsc->metric.d_lease_mis); |
2002 | ||
200fd27c | 2003 | op = ceph_snap(dir) == CEPH_SNAPDIR ? |
5eb9f604 | 2004 | CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; |
200fd27c YZ |
2005 | req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); |
2006 | if (!IS_ERR(req)) { | |
2007 | req->r_dentry = dget(dentry); | |
5eb9f604 JL |
2008 | req->r_num_caps = 2; |
2009 | req->r_parent = dir; | |
4c183472 | 2010 | ihold(dir); |
200fd27c YZ |
2011 | |
2012 | mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED; | |
2013 | if (ceph_security_xattr_wanted(dir)) | |
2014 | mask |= CEPH_CAP_XATTR_SHARED; | |
1097680d | 2015 | req->r_args.getattr.mask = cpu_to_le32(mask); |
200fd27c | 2016 | |
200fd27c | 2017 | err = ceph_mdsc_do_request(mdsc, NULL, req); |
c3f4688a JL |
2018 | switch (err) { |
2019 | case 0: | |
2020 | if (d_really_is_positive(dentry) && | |
2021 | d_inode(dentry) == req->r_target_inode) | |
2022 | valid = 1; | |
2023 | break; | |
2024 | case -ENOENT: | |
2025 | if (d_really_is_negative(dentry)) | |
2026 | valid = 1; | |
df561f66 | 2027 | fallthrough; |
c3f4688a JL |
2028 | default: |
2029 | break; | |
200fd27c YZ |
2030 | } |
2031 | ceph_mdsc_put_request(req); | |
38d46409 XL |
2032 | doutc(cl, "%p '%pd', lookup result=%d\n", dentry, |
2033 | dentry, err); | |
200fd27c | 2034 | } |
f9009efa XL |
2035 | } else { |
2036 | percpu_counter_inc(&mdsc->metric.d_lease_hit); | |
200fd27c YZ |
2037 | } |
2038 | ||
38d46409 | 2039 | doutc(cl, "%p '%pd' %s\n", dentry, dentry, valid ? "valid" : "invalid"); |
37c4efc1 | 2040 | if (!valid) |
9215aeea | 2041 | ceph_dir_clear_complete(dir); |
641235d8 | 2042 | |
f49d1e05 JL |
2043 | if (!(flags & LOOKUP_RCU)) |
2044 | dput(parent); | |
bf1c6aca | 2045 | return valid; |
2817b000 SW |
2046 | } |
2047 | ||
1e9c2eb6 YZ |
2048 | /* |
2049 | * Delete unused dentry that doesn't have valid lease | |
2050 | * | |
2051 | * Called under dentry->d_lock. | |
2052 | */ | |
2053 | static int ceph_d_delete(const struct dentry *dentry) | |
2054 | { | |
2055 | struct ceph_dentry_info *di; | |
2056 | ||
2057 | /* won't release caps */ | |
2058 | if (d_really_is_negative(dentry)) | |
2059 | return 0; | |
2060 | if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP) | |
2061 | return 0; | |
2062 | /* vaild lease? */ | |
2063 | di = ceph_dentry(dentry); | |
2064 | if (di) { | |
2065 | if (__dentry_lease_is_valid(di)) | |
2066 | return 0; | |
2067 | if (__dir_lease_try_check(dentry)) | |
2068 | return 0; | |
2069 | } | |
2070 | return 1; | |
2071 | } | |
2072 | ||
2817b000 | 2073 | /* |
147851d2 | 2074 | * Release our ceph_dentry_info. |
2817b000 | 2075 | */ |
147851d2 | 2076 | static void ceph_d_release(struct dentry *dentry) |
2817b000 SW |
2077 | { |
2078 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
5995d90d | 2079 | struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dentry->d_sb); |
2817b000 | 2080 | |
38d46409 | 2081 | doutc(fsc->client, "dentry %p '%pd'\n", dentry, dentry); |
5b484a51 | 2082 | |
f9009efa XL |
2083 | atomic64_dec(&fsc->mdsc->metric.total_dentries); |
2084 | ||
5b484a51 | 2085 | spin_lock(&dentry->d_lock); |
37c4efc1 | 2086 | __dentry_lease_unlist(di); |
5b484a51 JL |
2087 | dentry->d_fsdata = NULL; |
2088 | spin_unlock(&dentry->d_lock); | |
2089 | ||
7e65624d | 2090 | ceph_put_mds_session(di->lease_session); |
3d8eb7a9 | 2091 | kmem_cache_free(ceph_dentry_cachep, di); |
2817b000 SW |
2092 | } |
2093 | ||
b58dc410 SW |
2094 | /* |
2095 | * When the VFS prunes a dentry from the cache, we need to clear the | |
2096 | * complete flag on the parent directory. | |
2097 | * | |
2098 | * Called under dentry->d_lock. | |
2099 | */ | |
2100 | static void ceph_d_prune(struct dentry *dentry) | |
2101 | { | |
38d46409 XL |
2102 | struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dentry->d_sb); |
2103 | struct ceph_client *cl = mdsc->fsc->client; | |
5495c2d0 YZ |
2104 | struct ceph_inode_info *dir_ci; |
2105 | struct ceph_dentry_info *di; | |
2106 | ||
38d46409 | 2107 | doutc(cl, "dentry %p '%pd'\n", dentry, dentry); |
b58dc410 SW |
2108 | |
2109 | /* do we have a valid parent? */ | |
8842b3be | 2110 | if (IS_ROOT(dentry)) |
b58dc410 SW |
2111 | return; |
2112 | ||
5495c2d0 YZ |
2113 | /* we hold d_lock, so d_parent is stable */ |
2114 | dir_ci = ceph_inode(d_inode(dentry->d_parent)); | |
2115 | if (dir_ci->i_vino.snap == CEPH_SNAPDIR) | |
b58dc410 | 2116 | return; |
2817b000 | 2117 | |
5495c2d0 YZ |
2118 | /* who calls d_delete() should also disable dcache readdir */ |
2119 | if (d_really_is_negative(dentry)) | |
18fc8abd AV |
2120 | return; |
2121 | ||
5495c2d0 YZ |
2122 | /* d_fsdata does not get cleared until d_release */ |
2123 | if (!d_unhashed(dentry)) { | |
2124 | __ceph_dir_clear_complete(dir_ci); | |
2125 | return; | |
2126 | } | |
2127 | ||
2128 | /* Disable dcache readdir just in case that someone called d_drop() | |
2129 | * or d_invalidate(), but MDS didn't revoke CEPH_CAP_FILE_SHARED | |
2130 | * properly (dcache readdir is still enabled) */ | |
2131 | di = ceph_dentry(dentry); | |
2132 | if (di->offset > 0 && | |
2133 | di->lease_shared_gen == atomic_read(&dir_ci->i_shared_gen)) | |
2134 | __ceph_dir_clear_ordered(dir_ci); | |
b58dc410 | 2135 | } |
2817b000 SW |
2136 | |
2137 | /* | |
2138 | * read() on a dir. This weird interface hack only works if mounted | |
2139 | * with '-o dirstat'. | |
2140 | */ | |
2141 | static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, | |
2142 | loff_t *ppos) | |
2143 | { | |
bb48bd4d | 2144 | struct ceph_dir_file_info *dfi = file->private_data; |
496ad9aa | 2145 | struct inode *inode = file_inode(file); |
2817b000 SW |
2146 | struct ceph_inode_info *ci = ceph_inode(inode); |
2147 | int left; | |
ae598083 | 2148 | const int bufsize = 1024; |
2817b000 | 2149 | |
5995d90d | 2150 | if (!ceph_test_mount_opt(ceph_sb_to_fs_client(inode->i_sb), DIRSTAT)) |
2817b000 SW |
2151 | return -EISDIR; |
2152 | ||
bb48bd4d CX |
2153 | if (!dfi->dir_info) { |
2154 | dfi->dir_info = kmalloc(bufsize, GFP_KERNEL); | |
2155 | if (!dfi->dir_info) | |
2817b000 | 2156 | return -ENOMEM; |
bb48bd4d CX |
2157 | dfi->dir_info_len = |
2158 | snprintf(dfi->dir_info, bufsize, | |
2817b000 SW |
2159 | "entries: %20lld\n" |
2160 | " files: %20lld\n" | |
2161 | " subdirs: %20lld\n" | |
2162 | "rentries: %20lld\n" | |
2163 | " rfiles: %20lld\n" | |
2164 | " rsubdirs: %20lld\n" | |
2165 | "rbytes: %20lld\n" | |
9bbeab41 | 2166 | "rctime: %10lld.%09ld\n", |
2817b000 SW |
2167 | ci->i_files + ci->i_subdirs, |
2168 | ci->i_files, | |
2169 | ci->i_subdirs, | |
2170 | ci->i_rfiles + ci->i_rsubdirs, | |
2171 | ci->i_rfiles, | |
2172 | ci->i_rsubdirs, | |
2173 | ci->i_rbytes, | |
9bbeab41 AB |
2174 | ci->i_rctime.tv_sec, |
2175 | ci->i_rctime.tv_nsec); | |
2817b000 SW |
2176 | } |
2177 | ||
bb48bd4d | 2178 | if (*ppos >= dfi->dir_info_len) |
2817b000 | 2179 | return 0; |
bb48bd4d CX |
2180 | size = min_t(unsigned, size, dfi->dir_info_len-*ppos); |
2181 | left = copy_to_user(buf, dfi->dir_info + *ppos, size); | |
2817b000 SW |
2182 | if (left == size) |
2183 | return -EFAULT; | |
2184 | *ppos += (size - left); | |
2185 | return size - left; | |
2186 | } | |
2187 | ||
2817b000 | 2188 | |
2817b000 | 2189 | |
6c0f3af7 SW |
2190 | /* |
2191 | * Return name hash for a given dentry. This is dependent on | |
2192 | * the parent directory's hash function. | |
2193 | */ | |
e5f86dc3 | 2194 | unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn) |
6c0f3af7 | 2195 | { |
6c0f3af7 | 2196 | struct ceph_inode_info *dci = ceph_inode(dir); |
76a495d6 | 2197 | unsigned hash; |
6c0f3af7 SW |
2198 | |
2199 | switch (dci->i_dir_layout.dl_dir_hash) { | |
2200 | case 0: /* for backward compat */ | |
2201 | case CEPH_STR_HASH_LINUX: | |
2202 | return dn->d_name.hash; | |
2203 | ||
2204 | default: | |
76a495d6 JL |
2205 | spin_lock(&dn->d_lock); |
2206 | hash = ceph_str_hash(dci->i_dir_layout.dl_dir_hash, | |
6c0f3af7 | 2207 | dn->d_name.name, dn->d_name.len); |
76a495d6 JL |
2208 | spin_unlock(&dn->d_lock); |
2209 | return hash; | |
6c0f3af7 SW |
2210 | } |
2211 | } | |
2212 | ||
3e327154 | 2213 | WRAP_DIR_ITER(ceph_readdir) // FIXME! |
2817b000 SW |
2214 | const struct file_operations ceph_dir_fops = { |
2215 | .read = ceph_read_dir, | |
3e327154 | 2216 | .iterate_shared = shared_ceph_readdir, |
2817b000 SW |
2217 | .llseek = ceph_dir_llseek, |
2218 | .open = ceph_open, | |
2219 | .release = ceph_release, | |
2220 | .unlocked_ioctl = ceph_ioctl, | |
18bd6caa | 2221 | .compat_ioctl = compat_ptr_ioctl, |
da819c81 | 2222 | .fsync = ceph_fsync, |
597817dd YZ |
2223 | .lock = ceph_lock, |
2224 | .flock = ceph_flock, | |
2817b000 SW |
2225 | }; |
2226 | ||
38c48b5f | 2227 | const struct file_operations ceph_snapdir_fops = { |
3e327154 | 2228 | .iterate_shared = shared_ceph_readdir, |
38c48b5f YZ |
2229 | .llseek = ceph_dir_llseek, |
2230 | .open = ceph_open, | |
2231 | .release = ceph_release, | |
2232 | }; | |
2233 | ||
2817b000 SW |
2234 | const struct inode_operations ceph_dir_iops = { |
2235 | .lookup = ceph_lookup, | |
2236 | .permission = ceph_permission, | |
2237 | .getattr = ceph_getattr, | |
2238 | .setattr = ceph_setattr, | |
2817b000 | 2239 | .listxattr = ceph_listxattr, |
cac2f8b8 | 2240 | .get_inode_acl = ceph_get_acl, |
72466d0b | 2241 | .set_acl = ceph_set_acl, |
2817b000 SW |
2242 | .mknod = ceph_mknod, |
2243 | .symlink = ceph_symlink, | |
2244 | .mkdir = ceph_mkdir, | |
2245 | .link = ceph_link, | |
2246 | .unlink = ceph_unlink, | |
2247 | .rmdir = ceph_unlink, | |
2248 | .rename = ceph_rename, | |
2249 | .create = ceph_create, | |
2d83bde9 | 2250 | .atomic_open = ceph_atomic_open, |
2817b000 SW |
2251 | }; |
2252 | ||
38c48b5f YZ |
2253 | const struct inode_operations ceph_snapdir_iops = { |
2254 | .lookup = ceph_lookup, | |
2255 | .permission = ceph_permission, | |
2256 | .getattr = ceph_getattr, | |
2257 | .mkdir = ceph_mkdir, | |
2258 | .rmdir = ceph_unlink, | |
0ea611a3 | 2259 | .rename = ceph_rename, |
38c48b5f YZ |
2260 | }; |
2261 | ||
52dfb8ac | 2262 | const struct dentry_operations ceph_dentry_ops = { |
2817b000 | 2263 | .d_revalidate = ceph_d_revalidate, |
1e9c2eb6 | 2264 | .d_delete = ceph_d_delete, |
147851d2 | 2265 | .d_release = ceph_d_release, |
b58dc410 | 2266 | .d_prune = ceph_d_prune, |
ad5cb123 | 2267 | .d_init = ceph_d_init, |
2817b000 | 2268 | }; |