Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
e9be9d5e MS |
2 | /* |
3 | * | |
4 | * Copyright (C) 2011 Novell Inc. | |
e9be9d5e MS |
5 | */ |
6 | ||
7 | #include <linux/fs.h> | |
8 | #include <linux/slab.h> | |
9 | #include <linux/namei.h> | |
10 | #include <linux/file.h> | |
11 | #include <linux/xattr.h> | |
12 | #include <linux/rbtree.h> | |
13 | #include <linux/security.h> | |
14 | #include <linux/cred.h> | |
b5efccbe | 15 | #include <linux/ratelimit.h> |
e9be9d5e MS |
16 | #include "overlayfs.h" |
17 | ||
18 | struct ovl_cache_entry { | |
e9be9d5e MS |
19 | unsigned int len; |
20 | unsigned int type; | |
b5efccbe | 21 | u64 real_ino; |
e9be9d5e | 22 | u64 ino; |
e9be9d5e MS |
23 | struct list_head l_node; |
24 | struct rb_node node; | |
cdb67279 | 25 | struct ovl_cache_entry *next_maybe_whiteout; |
95e598e7 | 26 | bool is_upper; |
c2096537 | 27 | bool is_whiteout; |
68bf8611 | 28 | char name[]; |
e9be9d5e MS |
29 | }; |
30 | ||
31 | struct ovl_dir_cache { | |
32 | long refcount; | |
33 | u64 version; | |
34 | struct list_head entries; | |
4edb83bb | 35 | struct rb_root root; |
e9be9d5e MS |
36 | }; |
37 | ||
38 | struct ovl_readdir_data { | |
39 | struct dir_context ctx; | |
3fe6e52f | 40 | struct dentry *dentry; |
56656e96 | 41 | bool is_lowest; |
4edb83bb | 42 | struct rb_root *root; |
e9be9d5e | 43 | struct list_head *list; |
db6ec212 | 44 | struct list_head middle; |
cdb67279 | 45 | struct ovl_cache_entry *first_maybe_whiteout; |
e9be9d5e MS |
46 | int count; |
47 | int err; | |
b5efccbe | 48 | bool is_upper; |
45aebeaf | 49 | bool d_type_supported; |
e9be9d5e MS |
50 | }; |
51 | ||
52 | struct ovl_dir_file { | |
53 | bool is_real; | |
54 | bool is_upper; | |
55 | struct ovl_dir_cache *cache; | |
4330397e | 56 | struct list_head *cursor; |
e9be9d5e MS |
57 | struct file *realfile; |
58 | struct file *upperfile; | |
59 | }; | |
60 | ||
61 | static struct ovl_cache_entry *ovl_cache_entry_from_node(struct rb_node *n) | |
62 | { | |
4edb83bb MS |
63 | return rb_entry(n, struct ovl_cache_entry, node); |
64 | } | |
65 | ||
66 | static bool ovl_cache_entry_find_link(const char *name, int len, | |
67 | struct rb_node ***link, | |
68 | struct rb_node **parent) | |
69 | { | |
70 | bool found = false; | |
71 | struct rb_node **newp = *link; | |
72 | ||
73 | while (!found && *newp) { | |
74 | int cmp; | |
75 | struct ovl_cache_entry *tmp; | |
76 | ||
77 | *parent = *newp; | |
78 | tmp = ovl_cache_entry_from_node(*newp); | |
79 | cmp = strncmp(name, tmp->name, len); | |
80 | if (cmp > 0) | |
81 | newp = &tmp->node.rb_right; | |
82 | else if (cmp < 0 || len < tmp->len) | |
83 | newp = &tmp->node.rb_left; | |
84 | else | |
85 | found = true; | |
86 | } | |
87 | *link = newp; | |
88 | ||
89 | return found; | |
e9be9d5e MS |
90 | } |
91 | ||
92 | static struct ovl_cache_entry *ovl_cache_entry_find(struct rb_root *root, | |
93 | const char *name, int len) | |
94 | { | |
95 | struct rb_node *node = root->rb_node; | |
96 | int cmp; | |
97 | ||
98 | while (node) { | |
99 | struct ovl_cache_entry *p = ovl_cache_entry_from_node(node); | |
100 | ||
101 | cmp = strncmp(name, p->name, len); | |
102 | if (cmp > 0) | |
103 | node = p->node.rb_right; | |
104 | else if (cmp < 0 || len < p->len) | |
105 | node = p->node.rb_left; | |
106 | else | |
107 | return p; | |
108 | } | |
109 | ||
110 | return NULL; | |
111 | } | |
112 | ||
b5efccbe AG |
113 | static bool ovl_calc_d_ino(struct ovl_readdir_data *rdd, |
114 | struct ovl_cache_entry *p) | |
115 | { | |
116 | /* Don't care if not doing ovl_iter() */ | |
117 | if (!rdd->dentry) | |
118 | return false; | |
119 | ||
adbf4f7e AG |
120 | /* Always recalc d_ino when remapping lower inode numbers */ |
121 | if (ovl_xino_bits(rdd->dentry->d_sb)) | |
122 | return true; | |
123 | ||
b5efccbe AG |
124 | /* Always recalc d_ino for parent */ |
125 | if (strcmp(p->name, "..") == 0) | |
126 | return true; | |
127 | ||
128 | /* If this is lower, then native d_ino will do */ | |
129 | if (!rdd->is_upper) | |
130 | return false; | |
131 | ||
132 | /* | |
133 | * Recalc d_ino for '.' and for all entries if dir is impure (contains | |
134 | * copied up entries) | |
135 | */ | |
136 | if ((p->name[0] == '.' && p->len == 1) || | |
137 | ovl_test_flag(OVL_IMPURE, d_inode(rdd->dentry))) | |
138 | return true; | |
139 | ||
140 | return false; | |
141 | } | |
142 | ||
cdb67279 | 143 | static struct ovl_cache_entry *ovl_cache_entry_new(struct ovl_readdir_data *rdd, |
3e01cee3 | 144 | const char *name, int len, |
e9be9d5e MS |
145 | u64 ino, unsigned int d_type) |
146 | { | |
147 | struct ovl_cache_entry *p; | |
68bf8611 | 148 | size_t size = offsetof(struct ovl_cache_entry, name[len + 1]); |
e9be9d5e | 149 | |
68bf8611 | 150 | p = kmalloc(size, GFP_KERNEL); |
3e01cee3 MS |
151 | if (!p) |
152 | return NULL; | |
153 | ||
154 | memcpy(p->name, name, len); | |
155 | p->name[len] = '\0'; | |
156 | p->len = len; | |
157 | p->type = d_type; | |
b5efccbe | 158 | p->real_ino = ino; |
3e01cee3 | 159 | p->ino = ino; |
b5efccbe AG |
160 | /* Defer setting d_ino for upper entry to ovl_iterate() */ |
161 | if (ovl_calc_d_ino(rdd, p)) | |
162 | p->ino = 0; | |
95e598e7 | 163 | p->is_upper = rdd->is_upper; |
3e01cee3 | 164 | p->is_whiteout = false; |
3e01cee3 MS |
165 | |
166 | if (d_type == DT_CHR) { | |
cdb67279 MS |
167 | p->next_maybe_whiteout = rdd->first_maybe_whiteout; |
168 | rdd->first_maybe_whiteout = p; | |
3e01cee3 | 169 | } |
e9be9d5e MS |
170 | return p; |
171 | } | |
172 | ||
25885a35 | 173 | static bool ovl_cache_entry_add_rb(struct ovl_readdir_data *rdd, |
e9be9d5e MS |
174 | const char *name, int len, u64 ino, |
175 | unsigned int d_type) | |
176 | { | |
4edb83bb | 177 | struct rb_node **newp = &rdd->root->rb_node; |
e9be9d5e MS |
178 | struct rb_node *parent = NULL; |
179 | struct ovl_cache_entry *p; | |
180 | ||
4edb83bb | 181 | if (ovl_cache_entry_find_link(name, len, &newp, &parent)) |
25885a35 | 182 | return true; |
e9be9d5e | 183 | |
cdb67279 | 184 | p = ovl_cache_entry_new(rdd, name, len, ino, d_type); |
31e8ccea MS |
185 | if (p == NULL) { |
186 | rdd->err = -ENOMEM; | |
25885a35 | 187 | return false; |
31e8ccea | 188 | } |
e9be9d5e MS |
189 | |
190 | list_add_tail(&p->l_node, rdd->list); | |
191 | rb_link_node(&p->node, parent, newp); | |
4edb83bb | 192 | rb_insert_color(&p->node, rdd->root); |
e9be9d5e | 193 | |
25885a35 | 194 | return true; |
e9be9d5e MS |
195 | } |
196 | ||
25885a35 | 197 | static bool ovl_fill_lowest(struct ovl_readdir_data *rdd, |
56656e96 MS |
198 | const char *name, int namelen, |
199 | loff_t offset, u64 ino, unsigned int d_type) | |
e9be9d5e MS |
200 | { |
201 | struct ovl_cache_entry *p; | |
202 | ||
4edb83bb | 203 | p = ovl_cache_entry_find(rdd->root, name, namelen); |
e9be9d5e | 204 | if (p) { |
db6ec212 | 205 | list_move_tail(&p->l_node, &rdd->middle); |
e9be9d5e | 206 | } else { |
cdb67279 | 207 | p = ovl_cache_entry_new(rdd, name, namelen, ino, d_type); |
e9be9d5e MS |
208 | if (p == NULL) |
209 | rdd->err = -ENOMEM; | |
210 | else | |
db6ec212 | 211 | list_add_tail(&p->l_node, &rdd->middle); |
e9be9d5e MS |
212 | } |
213 | ||
25885a35 | 214 | return rdd->err == 0; |
e9be9d5e MS |
215 | } |
216 | ||
217 | void ovl_cache_free(struct list_head *list) | |
218 | { | |
219 | struct ovl_cache_entry *p; | |
220 | struct ovl_cache_entry *n; | |
221 | ||
222 | list_for_each_entry_safe(p, n, list, l_node) | |
223 | kfree(p); | |
224 | ||
225 | INIT_LIST_HEAD(list); | |
226 | } | |
227 | ||
4edb83bb MS |
228 | void ovl_dir_cache_free(struct inode *inode) |
229 | { | |
230 | struct ovl_dir_cache *cache = ovl_dir_cache(inode); | |
231 | ||
232 | if (cache) { | |
233 | ovl_cache_free(&cache->entries); | |
234 | kfree(cache); | |
235 | } | |
236 | } | |
237 | ||
1fa9c5c5 | 238 | static void ovl_cache_put(struct ovl_dir_file *od, struct inode *inode) |
e9be9d5e MS |
239 | { |
240 | struct ovl_dir_cache *cache = od->cache; | |
241 | ||
e9be9d5e MS |
242 | WARN_ON(cache->refcount <= 0); |
243 | cache->refcount--; | |
244 | if (!cache->refcount) { | |
1fa9c5c5 MS |
245 | if (ovl_dir_cache(inode) == cache) |
246 | ovl_set_dir_cache(inode, NULL); | |
e9be9d5e MS |
247 | |
248 | ovl_cache_free(&cache->entries); | |
249 | kfree(cache); | |
250 | } | |
251 | } | |
252 | ||
25885a35 | 253 | static bool ovl_fill_merge(struct dir_context *ctx, const char *name, |
ac7576f4 MS |
254 | int namelen, loff_t offset, u64 ino, |
255 | unsigned int d_type) | |
e9be9d5e | 256 | { |
ac7576f4 MS |
257 | struct ovl_readdir_data *rdd = |
258 | container_of(ctx, struct ovl_readdir_data, ctx); | |
e9be9d5e MS |
259 | |
260 | rdd->count++; | |
56656e96 | 261 | if (!rdd->is_lowest) |
e9be9d5e MS |
262 | return ovl_cache_entry_add_rb(rdd, name, namelen, ino, d_type); |
263 | else | |
56656e96 | 264 | return ovl_fill_lowest(rdd, name, namelen, offset, ino, d_type); |
e9be9d5e MS |
265 | } |
266 | ||
2d343087 | 267 | static int ovl_check_whiteouts(const struct path *path, struct ovl_readdir_data *rdd) |
cdb67279 MS |
268 | { |
269 | int err; | |
270 | struct ovl_cache_entry *p; | |
ba9ea771 | 271 | struct dentry *dentry, *dir = path->dentry; |
cdb67279 | 272 | const struct cred *old_cred; |
cdb67279 | 273 | |
3fe6e52f | 274 | old_cred = ovl_override_creds(rdd->dentry->d_sb); |
cdb67279 | 275 | |
00235411 | 276 | err = down_write_killable(&dir->d_inode->i_rwsem); |
cdb67279 MS |
277 | if (!err) { |
278 | while (rdd->first_maybe_whiteout) { | |
279 | p = rdd->first_maybe_whiteout; | |
280 | rdd->first_maybe_whiteout = p->next_maybe_whiteout; | |
ba9ea771 | 281 | dentry = lookup_one(mnt_user_ns(path->mnt), p->name, dir, p->len); |
cdb67279 MS |
282 | if (!IS_ERR(dentry)) { |
283 | p->is_whiteout = ovl_is_whiteout(dentry); | |
284 | dput(dentry); | |
285 | } | |
286 | } | |
5955102c | 287 | inode_unlock(dir->d_inode); |
cdb67279 MS |
288 | } |
289 | revert_creds(old_cred); | |
cdb67279 MS |
290 | |
291 | return err; | |
292 | } | |
293 | ||
2d343087 | 294 | static inline int ovl_dir_read(const struct path *realpath, |
e9be9d5e MS |
295 | struct ovl_readdir_data *rdd) |
296 | { | |
297 | struct file *realfile; | |
298 | int err; | |
299 | ||
130fdbc3 | 300 | realfile = ovl_path_open(realpath, O_RDONLY | O_LARGEFILE); |
e9be9d5e MS |
301 | if (IS_ERR(realfile)) |
302 | return PTR_ERR(realfile); | |
303 | ||
cdb67279 | 304 | rdd->first_maybe_whiteout = NULL; |
e9be9d5e MS |
305 | rdd->ctx.pos = 0; |
306 | do { | |
307 | rdd->count = 0; | |
308 | rdd->err = 0; | |
309 | err = iterate_dir(realfile, &rdd->ctx); | |
310 | if (err >= 0) | |
311 | err = rdd->err; | |
312 | } while (!err && rdd->count); | |
cdb67279 | 313 | |
eea2fb48 | 314 | if (!err && rdd->first_maybe_whiteout && rdd->dentry) |
ba9ea771 | 315 | err = ovl_check_whiteouts(realpath, rdd); |
cdb67279 | 316 | |
e9be9d5e MS |
317 | fput(realfile); |
318 | ||
319 | return err; | |
320 | } | |
321 | ||
322 | static void ovl_dir_reset(struct file *file) | |
323 | { | |
324 | struct ovl_dir_file *od = file->private_data; | |
325 | struct ovl_dir_cache *cache = od->cache; | |
1fa9c5c5 | 326 | struct inode *inode = file_inode(file); |
b79e05aa | 327 | bool is_real; |
e9be9d5e | 328 | |
1fa9c5c5 MS |
329 | if (cache && ovl_inode_version_get(inode) != cache->version) { |
330 | ovl_cache_put(od, inode); | |
e9be9d5e | 331 | od->cache = NULL; |
4330397e | 332 | od->cursor = NULL; |
e9be9d5e | 333 | } |
1fa9c5c5 | 334 | is_real = ovl_dir_is_real(inode); |
b79e05aa AG |
335 | if (od->is_real != is_real) { |
336 | /* is_real can only become false when dir is copied up */ | |
337 | if (WARN_ON(is_real)) | |
338 | return; | |
e9be9d5e | 339 | od->is_real = false; |
b79e05aa | 340 | } |
e9be9d5e MS |
341 | } |
342 | ||
4edb83bb MS |
343 | static int ovl_dir_read_merged(struct dentry *dentry, struct list_head *list, |
344 | struct rb_root *root) | |
e9be9d5e MS |
345 | { |
346 | int err; | |
9d7459d8 | 347 | struct path realpath; |
e9be9d5e MS |
348 | struct ovl_readdir_data rdd = { |
349 | .ctx.actor = ovl_fill_merge, | |
3fe6e52f | 350 | .dentry = dentry, |
e9be9d5e | 351 | .list = list, |
4edb83bb | 352 | .root = root, |
56656e96 | 353 | .is_lowest = false, |
e9be9d5e | 354 | }; |
9d7459d8 | 355 | int idx, next; |
e9be9d5e | 356 | |
9d7459d8 MS |
357 | for (idx = 0; idx != -1; idx = next) { |
358 | next = ovl_path_next(idx, dentry, &realpath); | |
b5efccbe | 359 | rdd.is_upper = ovl_dentry_upper(dentry) == realpath.dentry; |
c9f00fdb | 360 | |
9d7459d8 | 361 | if (next != -1) { |
9d7459d8 | 362 | err = ovl_dir_read(&realpath, &rdd); |
e9be9d5e | 363 | if (err) |
9d7459d8 MS |
364 | break; |
365 | } else { | |
366 | /* | |
367 | * Insert lowest layer entries before upper ones, this | |
368 | * allows offsets to be reasonably constant | |
369 | */ | |
370 | list_add(&rdd.middle, rdd.list); | |
56656e96 | 371 | rdd.is_lowest = true; |
9d7459d8 MS |
372 | err = ovl_dir_read(&realpath, &rdd); |
373 | list_del(&rdd.middle); | |
e9be9d5e MS |
374 | } |
375 | } | |
e9be9d5e | 376 | return err; |
e9be9d5e MS |
377 | } |
378 | ||
379 | static void ovl_seek_cursor(struct ovl_dir_file *od, loff_t pos) | |
380 | { | |
4330397e | 381 | struct list_head *p; |
e9be9d5e MS |
382 | loff_t off = 0; |
383 | ||
4330397e | 384 | list_for_each(p, &od->cache->entries) { |
e9be9d5e MS |
385 | if (off >= pos) |
386 | break; | |
387 | off++; | |
388 | } | |
4330397e | 389 | /* Cursor is safe since the cache is stable */ |
390 | od->cursor = p; | |
e9be9d5e MS |
391 | } |
392 | ||
393 | static struct ovl_dir_cache *ovl_cache_get(struct dentry *dentry) | |
394 | { | |
395 | int res; | |
e9be9d5e | 396 | struct ovl_dir_cache *cache; |
1fa9c5c5 | 397 | struct inode *inode = d_inode(dentry); |
e9be9d5e | 398 | |
1fa9c5c5 MS |
399 | cache = ovl_dir_cache(inode); |
400 | if (cache && ovl_inode_version_get(inode) == cache->version) { | |
4edb83bb | 401 | WARN_ON(!cache->refcount); |
e9be9d5e MS |
402 | cache->refcount++; |
403 | return cache; | |
404 | } | |
4edb83bb | 405 | ovl_set_dir_cache(d_inode(dentry), NULL); |
e9be9d5e MS |
406 | |
407 | cache = kzalloc(sizeof(struct ovl_dir_cache), GFP_KERNEL); | |
408 | if (!cache) | |
409 | return ERR_PTR(-ENOMEM); | |
410 | ||
411 | cache->refcount = 1; | |
412 | INIT_LIST_HEAD(&cache->entries); | |
4edb83bb | 413 | cache->root = RB_ROOT; |
e9be9d5e | 414 | |
4edb83bb | 415 | res = ovl_dir_read_merged(dentry, &cache->entries, &cache->root); |
e9be9d5e MS |
416 | if (res) { |
417 | ovl_cache_free(&cache->entries); | |
418 | kfree(cache); | |
419 | return ERR_PTR(res); | |
420 | } | |
421 | ||
1fa9c5c5 MS |
422 | cache->version = ovl_inode_version_get(inode); |
423 | ovl_set_dir_cache(inode, cache); | |
e9be9d5e MS |
424 | |
425 | return cache; | |
426 | } | |
427 | ||
adbf4f7e AG |
428 | /* Map inode number to lower fs unique range */ |
429 | static u64 ovl_remap_lower_ino(u64 ino, int xinobits, int fsid, | |
926e94d7 | 430 | const char *name, int namelen, bool warn) |
adbf4f7e | 431 | { |
dfe51d47 AG |
432 | unsigned int xinoshift = 64 - xinobits; |
433 | ||
434 | if (unlikely(ino >> xinoshift)) { | |
926e94d7 AG |
435 | if (warn) { |
436 | pr_warn_ratelimited("d_ino too big (%.*s, ino=%llu, xinobits=%d)\n", | |
437 | namelen, name, ino, xinobits); | |
438 | } | |
adbf4f7e AG |
439 | return ino; |
440 | } | |
441 | ||
dfe51d47 AG |
442 | /* |
443 | * The lowest xinobit is reserved for mapping the non-peresistent inode | |
444 | * numbers range, but this range is only exposed via st_ino, not here. | |
445 | */ | |
446 | return ino | ((u64)fsid) << (xinoshift + 1); | |
adbf4f7e AG |
447 | } |
448 | ||
b5efccbe AG |
449 | /* |
450 | * Set d_ino for upper entries. Non-upper entries should always report | |
451 | * the uppermost real inode ino and should not call this function. | |
452 | * | |
453 | * When not all layer are on same fs, report real ino also for upper. | |
454 | * | |
455 | * When all layers are on the same fs, and upper has a reference to | |
456 | * copy up origin, call vfs_getattr() on the overlay entry to make | |
457 | * sure that d_ino will be consistent with st_ino from stat(2). | |
458 | */ | |
2d343087 | 459 | static int ovl_cache_update_ino(const struct path *path, struct ovl_cache_entry *p) |
b5efccbe AG |
460 | |
461 | { | |
462 | struct dentry *dir = path->dentry; | |
463 | struct dentry *this = NULL; | |
464 | enum ovl_path_type type; | |
465 | u64 ino = p->real_ino; | |
adbf4f7e | 466 | int xinobits = ovl_xino_bits(dir->d_sb); |
b5efccbe AG |
467 | int err = 0; |
468 | ||
0f831ec8 | 469 | if (!ovl_same_dev(dir->d_sb)) |
b5efccbe AG |
470 | goto out; |
471 | ||
472 | if (p->name[0] == '.') { | |
473 | if (p->len == 1) { | |
474 | this = dget(dir); | |
475 | goto get; | |
476 | } | |
477 | if (p->len == 2 && p->name[1] == '.') { | |
478 | /* we shall not be moved */ | |
479 | this = dget(dir->d_parent); | |
480 | goto get; | |
481 | } | |
482 | } | |
ba9ea771 | 483 | this = lookup_one(mnt_user_ns(path->mnt), p->name, dir, p->len); |
b5efccbe | 484 | if (IS_ERR_OR_NULL(this) || !this->d_inode) { |
9011c279 AG |
485 | /* Mark a stale entry */ |
486 | p->is_whiteout = true; | |
b5efccbe AG |
487 | if (IS_ERR(this)) { |
488 | err = PTR_ERR(this); | |
489 | this = NULL; | |
490 | goto fail; | |
491 | } | |
492 | goto out; | |
493 | } | |
494 | ||
495 | get: | |
496 | type = ovl_path_type(this); | |
497 | if (OVL_TYPE_ORIGIN(type)) { | |
498 | struct kstat stat; | |
499 | struct path statpath = *path; | |
500 | ||
501 | statpath.dentry = this; | |
502 | err = vfs_getattr(&statpath, &stat, STATX_INO, 0); | |
503 | if (err) | |
504 | goto fail; | |
505 | ||
4c37e71b AG |
506 | /* |
507 | * Directory inode is always on overlay st_dev. | |
508 | * Non-dir with ovl_same_dev() could be on pseudo st_dev in case | |
509 | * of xino bits overflow. | |
510 | */ | |
511 | WARN_ON_ONCE(S_ISDIR(stat.mode) && | |
512 | dir->d_sb->s_dev != stat.dev); | |
b5efccbe | 513 | ino = stat.ino; |
adbf4f7e AG |
514 | } else if (xinobits && !OVL_TYPE_UPPER(type)) { |
515 | ino = ovl_remap_lower_ino(ino, xinobits, | |
516 | ovl_layer_lower(this)->fsid, | |
926e94d7 AG |
517 | p->name, p->len, |
518 | ovl_xino_warn(dir->d_sb)); | |
b5efccbe AG |
519 | } |
520 | ||
521 | out: | |
522 | p->ino = ino; | |
523 | dput(this); | |
524 | return err; | |
525 | ||
526 | fail: | |
1bd0a3ae | 527 | pr_warn_ratelimited("failed to look up (%s) for ino (%i)\n", |
b5efccbe AG |
528 | p->name, err); |
529 | goto out; | |
530 | } | |
531 | ||
25885a35 | 532 | static bool ovl_fill_plain(struct dir_context *ctx, const char *name, |
4edb83bb MS |
533 | int namelen, loff_t offset, u64 ino, |
534 | unsigned int d_type) | |
535 | { | |
536 | struct ovl_cache_entry *p; | |
537 | struct ovl_readdir_data *rdd = | |
538 | container_of(ctx, struct ovl_readdir_data, ctx); | |
539 | ||
540 | rdd->count++; | |
541 | p = ovl_cache_entry_new(rdd, name, namelen, ino, d_type); | |
542 | if (p == NULL) { | |
543 | rdd->err = -ENOMEM; | |
25885a35 | 544 | return false; |
4edb83bb MS |
545 | } |
546 | list_add_tail(&p->l_node, rdd->list); | |
547 | ||
25885a35 | 548 | return true; |
4edb83bb MS |
549 | } |
550 | ||
2d343087 | 551 | static int ovl_dir_read_impure(const struct path *path, struct list_head *list, |
4edb83bb MS |
552 | struct rb_root *root) |
553 | { | |
554 | int err; | |
555 | struct path realpath; | |
556 | struct ovl_cache_entry *p, *n; | |
557 | struct ovl_readdir_data rdd = { | |
558 | .ctx.actor = ovl_fill_plain, | |
559 | .list = list, | |
560 | .root = root, | |
561 | }; | |
562 | ||
563 | INIT_LIST_HEAD(list); | |
564 | *root = RB_ROOT; | |
565 | ovl_path_upper(path->dentry, &realpath); | |
566 | ||
567 | err = ovl_dir_read(&realpath, &rdd); | |
568 | if (err) | |
569 | return err; | |
570 | ||
571 | list_for_each_entry_safe(p, n, list, l_node) { | |
572 | if (strcmp(p->name, ".") != 0 && | |
573 | strcmp(p->name, "..") != 0) { | |
574 | err = ovl_cache_update_ino(path, p); | |
575 | if (err) | |
576 | return err; | |
577 | } | |
578 | if (p->ino == p->real_ino) { | |
579 | list_del(&p->l_node); | |
580 | kfree(p); | |
581 | } else { | |
582 | struct rb_node **newp = &root->rb_node; | |
583 | struct rb_node *parent = NULL; | |
584 | ||
585 | if (WARN_ON(ovl_cache_entry_find_link(p->name, p->len, | |
586 | &newp, &parent))) | |
587 | return -EIO; | |
588 | ||
589 | rb_link_node(&p->node, parent, newp); | |
590 | rb_insert_color(&p->node, root); | |
591 | } | |
592 | } | |
593 | return 0; | |
594 | } | |
595 | ||
2d343087 | 596 | static struct ovl_dir_cache *ovl_cache_get_impure(const struct path *path) |
4edb83bb MS |
597 | { |
598 | int res; | |
599 | struct dentry *dentry = path->dentry; | |
1fa9c5c5 | 600 | struct inode *inode = d_inode(dentry); |
610afc0b | 601 | struct ovl_fs *ofs = OVL_FS(dentry->d_sb); |
4edb83bb MS |
602 | struct ovl_dir_cache *cache; |
603 | ||
1fa9c5c5 MS |
604 | cache = ovl_dir_cache(inode); |
605 | if (cache && ovl_inode_version_get(inode) == cache->version) | |
4edb83bb MS |
606 | return cache; |
607 | ||
608 | /* Impure cache is not refcounted, free it here */ | |
1fa9c5c5 MS |
609 | ovl_dir_cache_free(inode); |
610 | ovl_set_dir_cache(inode, NULL); | |
4edb83bb MS |
611 | |
612 | cache = kzalloc(sizeof(struct ovl_dir_cache), GFP_KERNEL); | |
613 | if (!cache) | |
614 | return ERR_PTR(-ENOMEM); | |
615 | ||
616 | res = ovl_dir_read_impure(path, &cache->entries, &cache->root); | |
617 | if (res) { | |
618 | ovl_cache_free(&cache->entries); | |
619 | kfree(cache); | |
620 | return ERR_PTR(res); | |
621 | } | |
622 | if (list_empty(&cache->entries)) { | |
a5a927a7 AG |
623 | /* |
624 | * A good opportunity to get rid of an unneeded "impure" flag. | |
625 | * Removing the "impure" xattr is best effort. | |
626 | */ | |
627 | if (!ovl_want_write(dentry)) { | |
c914c0e2 AG |
628 | ovl_removexattr(ofs, ovl_dentry_upper(dentry), |
629 | OVL_XATTR_IMPURE); | |
a5a927a7 AG |
630 | ovl_drop_write(dentry); |
631 | } | |
1fa9c5c5 | 632 | ovl_clear_flag(OVL_IMPURE, inode); |
4edb83bb MS |
633 | kfree(cache); |
634 | return NULL; | |
635 | } | |
636 | ||
1fa9c5c5 MS |
637 | cache->version = ovl_inode_version_get(inode); |
638 | ovl_set_dir_cache(inode, cache); | |
4edb83bb MS |
639 | |
640 | return cache; | |
641 | } | |
642 | ||
643 | struct ovl_readdir_translate { | |
644 | struct dir_context *orig_ctx; | |
645 | struct ovl_dir_cache *cache; | |
646 | struct dir_context ctx; | |
647 | u64 parent_ino; | |
adbf4f7e AG |
648 | int fsid; |
649 | int xinobits; | |
926e94d7 | 650 | bool xinowarn; |
4edb83bb MS |
651 | }; |
652 | ||
25885a35 | 653 | static bool ovl_fill_real(struct dir_context *ctx, const char *name, |
4edb83bb MS |
654 | int namelen, loff_t offset, u64 ino, |
655 | unsigned int d_type) | |
656 | { | |
657 | struct ovl_readdir_translate *rdt = | |
658 | container_of(ctx, struct ovl_readdir_translate, ctx); | |
659 | struct dir_context *orig_ctx = rdt->orig_ctx; | |
660 | ||
adbf4f7e | 661 | if (rdt->parent_ino && strcmp(name, "..") == 0) { |
4edb83bb | 662 | ino = rdt->parent_ino; |
adbf4f7e | 663 | } else if (rdt->cache) { |
4edb83bb MS |
664 | struct ovl_cache_entry *p; |
665 | ||
666 | p = ovl_cache_entry_find(&rdt->cache->root, name, namelen); | |
667 | if (p) | |
668 | ino = p->ino; | |
adbf4f7e AG |
669 | } else if (rdt->xinobits) { |
670 | ino = ovl_remap_lower_ino(ino, rdt->xinobits, rdt->fsid, | |
926e94d7 | 671 | name, namelen, rdt->xinowarn); |
4edb83bb MS |
672 | } |
673 | ||
674 | return orig_ctx->actor(orig_ctx, name, namelen, offset, ino, d_type); | |
675 | } | |
676 | ||
67810693 AG |
677 | static bool ovl_is_impure_dir(struct file *file) |
678 | { | |
679 | struct ovl_dir_file *od = file->private_data; | |
1fa9c5c5 | 680 | struct inode *dir = file_inode(file); |
67810693 AG |
681 | |
682 | /* | |
683 | * Only upper dir can be impure, but if we are in the middle of | |
684 | * iterating a lower real dir, dir could be copied up and marked | |
685 | * impure. We only want the impure cache if we started iterating | |
686 | * a real upper dir to begin with. | |
687 | */ | |
688 | return od->is_upper && ovl_test_flag(OVL_IMPURE, dir); | |
689 | ||
690 | } | |
691 | ||
4edb83bb MS |
692 | static int ovl_iterate_real(struct file *file, struct dir_context *ctx) |
693 | { | |
694 | int err; | |
695 | struct ovl_dir_file *od = file->private_data; | |
696 | struct dentry *dir = file->f_path.dentry; | |
13464165 | 697 | const struct ovl_layer *lower_layer = ovl_layer_lower(dir); |
4edb83bb MS |
698 | struct ovl_readdir_translate rdt = { |
699 | .ctx.actor = ovl_fill_real, | |
700 | .orig_ctx = ctx, | |
adbf4f7e | 701 | .xinobits = ovl_xino_bits(dir->d_sb), |
926e94d7 | 702 | .xinowarn = ovl_xino_warn(dir->d_sb), |
4edb83bb MS |
703 | }; |
704 | ||
adbf4f7e AG |
705 | if (rdt.xinobits && lower_layer) |
706 | rdt.fsid = lower_layer->fsid; | |
707 | ||
4edb83bb MS |
708 | if (OVL_TYPE_MERGE(ovl_path_type(dir->d_parent))) { |
709 | struct kstat stat; | |
710 | struct path statpath = file->f_path; | |
711 | ||
712 | statpath.dentry = dir->d_parent; | |
713 | err = vfs_getattr(&statpath, &stat, STATX_INO, 0); | |
714 | if (err) | |
715 | return err; | |
716 | ||
717 | WARN_ON_ONCE(dir->d_sb->s_dev != stat.dev); | |
718 | rdt.parent_ino = stat.ino; | |
719 | } | |
720 | ||
67810693 | 721 | if (ovl_is_impure_dir(file)) { |
4edb83bb MS |
722 | rdt.cache = ovl_cache_get_impure(&file->f_path); |
723 | if (IS_ERR(rdt.cache)) | |
724 | return PTR_ERR(rdt.cache); | |
725 | } | |
726 | ||
b02a16e6 AG |
727 | err = iterate_dir(od->realfile, &rdt.ctx); |
728 | ctx->pos = rdt.ctx.pos; | |
729 | ||
730 | return err; | |
4edb83bb MS |
731 | } |
732 | ||
733 | ||
e9be9d5e MS |
734 | static int ovl_iterate(struct file *file, struct dir_context *ctx) |
735 | { | |
736 | struct ovl_dir_file *od = file->private_data; | |
737 | struct dentry *dentry = file->f_path.dentry; | |
4330397e | 738 | struct ovl_cache_entry *p; |
48bd024b | 739 | const struct cred *old_cred; |
b5efccbe | 740 | int err; |
e9be9d5e | 741 | |
48bd024b | 742 | old_cred = ovl_override_creds(dentry->d_sb); |
e9be9d5e MS |
743 | if (!ctx->pos) |
744 | ovl_dir_reset(file); | |
745 | ||
4edb83bb MS |
746 | if (od->is_real) { |
747 | /* | |
748 | * If parent is merge, then need to adjust d_ino for '..', if | |
749 | * dir is impure then need to adjust d_ino for copied up | |
750 | * entries. | |
751 | */ | |
adbf4f7e | 752 | if (ovl_xino_bits(dentry->d_sb) || |
0f831ec8 | 753 | (ovl_same_fs(dentry->d_sb) && |
67810693 | 754 | (ovl_is_impure_dir(file) || |
adbf4f7e | 755 | OVL_TYPE_MERGE(ovl_path_type(dentry->d_parent))))) { |
48bd024b MS |
756 | err = ovl_iterate_real(file, ctx); |
757 | } else { | |
758 | err = iterate_dir(od->realfile, ctx); | |
4edb83bb | 759 | } |
48bd024b | 760 | goto out; |
4edb83bb | 761 | } |
e9be9d5e MS |
762 | |
763 | if (!od->cache) { | |
764 | struct ovl_dir_cache *cache; | |
765 | ||
766 | cache = ovl_cache_get(dentry); | |
48bd024b | 767 | err = PTR_ERR(cache); |
e9be9d5e | 768 | if (IS_ERR(cache)) |
48bd024b | 769 | goto out; |
e9be9d5e MS |
770 | |
771 | od->cache = cache; | |
772 | ovl_seek_cursor(od, ctx->pos); | |
773 | } | |
774 | ||
4330397e | 775 | while (od->cursor != &od->cache->entries) { |
776 | p = list_entry(od->cursor, struct ovl_cache_entry, l_node); | |
b5efccbe AG |
777 | if (!p->is_whiteout) { |
778 | if (!p->ino) { | |
779 | err = ovl_cache_update_ino(&file->f_path, p); | |
780 | if (err) | |
48bd024b | 781 | goto out; |
b5efccbe | 782 | } |
9011c279 AG |
783 | } |
784 | /* ovl_cache_update_ino() sets is_whiteout on stale entry */ | |
785 | if (!p->is_whiteout) { | |
4330397e | 786 | if (!dir_emit(ctx, p->name, p->len, p->ino, p->type)) |
787 | break; | |
b5efccbe | 788 | } |
4330397e | 789 | od->cursor = p->l_node.next; |
790 | ctx->pos++; | |
e9be9d5e | 791 | } |
48bd024b MS |
792 | err = 0; |
793 | out: | |
794 | revert_creds(old_cred); | |
795 | return err; | |
e9be9d5e MS |
796 | } |
797 | ||
798 | static loff_t ovl_dir_llseek(struct file *file, loff_t offset, int origin) | |
799 | { | |
800 | loff_t res; | |
801 | struct ovl_dir_file *od = file->private_data; | |
802 | ||
5955102c | 803 | inode_lock(file_inode(file)); |
e9be9d5e MS |
804 | if (!file->f_pos) |
805 | ovl_dir_reset(file); | |
806 | ||
807 | if (od->is_real) { | |
808 | res = vfs_llseek(od->realfile, offset, origin); | |
809 | file->f_pos = od->realfile->f_pos; | |
810 | } else { | |
811 | res = -EINVAL; | |
812 | ||
813 | switch (origin) { | |
814 | case SEEK_CUR: | |
815 | offset += file->f_pos; | |
816 | break; | |
817 | case SEEK_SET: | |
818 | break; | |
819 | default: | |
820 | goto out_unlock; | |
821 | } | |
822 | if (offset < 0) | |
823 | goto out_unlock; | |
824 | ||
825 | if (offset != file->f_pos) { | |
826 | file->f_pos = offset; | |
827 | if (od->cache) | |
828 | ovl_seek_cursor(od, offset); | |
829 | } | |
830 | res = offset; | |
831 | } | |
832 | out_unlock: | |
5955102c | 833 | inode_unlock(file_inode(file)); |
e9be9d5e MS |
834 | |
835 | return res; | |
836 | } | |
837 | ||
61536bed | 838 | static struct file *ovl_dir_open_realfile(const struct file *file, |
2d343087 | 839 | const struct path *realpath) |
130fdbc3 | 840 | { |
48bd024b MS |
841 | struct file *res; |
842 | const struct cred *old_cred; | |
843 | ||
844 | old_cred = ovl_override_creds(file_inode(file)->i_sb); | |
845 | res = ovl_path_open(realpath, O_RDONLY | (file->f_flags & O_LARGEFILE)); | |
846 | revert_creds(old_cred); | |
847 | ||
848 | return res; | |
130fdbc3 MS |
849 | } |
850 | ||
61536bed AG |
851 | /* |
852 | * Like ovl_real_fdget(), returns upperfile if dir was copied up since open. | |
853 | * Unlike ovl_real_fdget(), this caches upperfile in file->private_data. | |
854 | * | |
855 | * TODO: use same abstract type for file->private_data of dir and file so | |
856 | * upperfile could also be cached for files as well. | |
857 | */ | |
858 | struct file *ovl_dir_real_file(const struct file *file, bool want_upper) | |
e9be9d5e | 859 | { |
61536bed | 860 | |
e9be9d5e MS |
861 | struct ovl_dir_file *od = file->private_data; |
862 | struct dentry *dentry = file->f_path.dentry; | |
b854cc65 | 863 | struct file *old, *realfile = od->realfile; |
e9be9d5e | 864 | |
d796e77f | 865 | if (!OVL_TYPE_UPPER(ovl_path_type(dentry))) |
61536bed | 866 | return want_upper ? NULL : realfile; |
c86243b0 | 867 | |
e9be9d5e MS |
868 | /* |
869 | * Need to check if we started out being a lower dir, but got copied up | |
870 | */ | |
d796e77f | 871 | if (!od->is_upper) { |
506458ef | 872 | realfile = READ_ONCE(od->upperfile); |
e9be9d5e MS |
873 | if (!realfile) { |
874 | struct path upperpath; | |
875 | ||
876 | ovl_path_upper(dentry, &upperpath); | |
130fdbc3 | 877 | realfile = ovl_dir_open_realfile(file, &upperpath); |
b854cc65 MS |
878 | if (IS_ERR(realfile)) |
879 | return realfile; | |
ff7a5fb0 | 880 | |
b854cc65 MS |
881 | old = cmpxchg_release(&od->upperfile, NULL, realfile); |
882 | if (old) { | |
883 | fput(realfile); | |
884 | realfile = old; | |
e9be9d5e | 885 | } |
e9be9d5e | 886 | } |
e9be9d5e MS |
887 | } |
888 | ||
61536bed AG |
889 | return realfile; |
890 | } | |
891 | ||
892 | static int ovl_dir_fsync(struct file *file, loff_t start, loff_t end, | |
893 | int datasync) | |
894 | { | |
895 | struct file *realfile; | |
896 | int err; | |
897 | ||
1fa9c5c5 | 898 | err = ovl_sync_status(OVL_FS(file_inode(file)->i_sb)); |
335d3fc5 SD |
899 | if (err <= 0) |
900 | return err; | |
61536bed AG |
901 | |
902 | realfile = ovl_dir_real_file(file, true); | |
903 | err = PTR_ERR_OR_ZERO(realfile); | |
904 | ||
905 | /* Nothing to sync for lower */ | |
906 | if (!realfile || err) | |
907 | return err; | |
908 | ||
e9be9d5e MS |
909 | return vfs_fsync_range(realfile, start, end, datasync); |
910 | } | |
911 | ||
912 | static int ovl_dir_release(struct inode *inode, struct file *file) | |
913 | { | |
914 | struct ovl_dir_file *od = file->private_data; | |
915 | ||
916 | if (od->cache) { | |
5955102c | 917 | inode_lock(inode); |
1fa9c5c5 | 918 | ovl_cache_put(od, inode); |
5955102c | 919 | inode_unlock(inode); |
e9be9d5e MS |
920 | } |
921 | fput(od->realfile); | |
922 | if (od->upperfile) | |
923 | fput(od->upperfile); | |
924 | kfree(od); | |
925 | ||
926 | return 0; | |
927 | } | |
928 | ||
929 | static int ovl_dir_open(struct inode *inode, struct file *file) | |
930 | { | |
931 | struct path realpath; | |
932 | struct file *realfile; | |
933 | struct ovl_dir_file *od; | |
934 | enum ovl_path_type type; | |
935 | ||
936 | od = kzalloc(sizeof(struct ovl_dir_file), GFP_KERNEL); | |
937 | if (!od) | |
938 | return -ENOMEM; | |
939 | ||
940 | type = ovl_path_real(file->f_path.dentry, &realpath); | |
130fdbc3 | 941 | realfile = ovl_dir_open_realfile(file, &realpath); |
e9be9d5e MS |
942 | if (IS_ERR(realfile)) { |
943 | kfree(od); | |
944 | return PTR_ERR(realfile); | |
945 | } | |
e9be9d5e | 946 | od->realfile = realfile; |
1fa9c5c5 | 947 | od->is_real = ovl_dir_is_real(inode); |
1afaba1e | 948 | od->is_upper = OVL_TYPE_UPPER(type); |
e9be9d5e MS |
949 | file->private_data = od; |
950 | ||
951 | return 0; | |
952 | } | |
953 | ||
954 | const struct file_operations ovl_dir_operations = { | |
955 | .read = generic_read_dir, | |
956 | .open = ovl_dir_open, | |
957 | .iterate = ovl_iterate, | |
958 | .llseek = ovl_dir_llseek, | |
959 | .fsync = ovl_dir_fsync, | |
960 | .release = ovl_dir_release, | |
961 | }; | |
962 | ||
963 | int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list) | |
964 | { | |
965 | int err; | |
95e598e7 | 966 | struct ovl_cache_entry *p, *n; |
4edb83bb | 967 | struct rb_root root = RB_ROOT; |
6d0a8a90 | 968 | const struct cred *old_cred; |
e9be9d5e | 969 | |
6d0a8a90 | 970 | old_cred = ovl_override_creds(dentry->d_sb); |
4edb83bb | 971 | err = ovl_dir_read_merged(dentry, list, &root); |
6d0a8a90 | 972 | revert_creds(old_cred); |
e9be9d5e MS |
973 | if (err) |
974 | return err; | |
975 | ||
976 | err = 0; | |
977 | ||
95e598e7 | 978 | list_for_each_entry_safe(p, n, list, l_node) { |
979 | /* | |
980 | * Select whiteouts in upperdir, they should | |
981 | * be cleared when deleting this directory. | |
982 | */ | |
983 | if (p->is_whiteout) { | |
984 | if (p->is_upper) | |
985 | continue; | |
986 | goto del_entry; | |
987 | } | |
e9be9d5e MS |
988 | |
989 | if (p->name[0] == '.') { | |
990 | if (p->len == 1) | |
95e598e7 | 991 | goto del_entry; |
e9be9d5e | 992 | if (p->len == 2 && p->name[1] == '.') |
95e598e7 | 993 | goto del_entry; |
e9be9d5e MS |
994 | } |
995 | err = -ENOTEMPTY; | |
996 | break; | |
95e598e7 | 997 | |
998 | del_entry: | |
999 | list_del(&p->l_node); | |
1000 | kfree(p); | |
e9be9d5e MS |
1001 | } |
1002 | ||
1003 | return err; | |
1004 | } | |
1005 | ||
576bb263 CB |
1006 | void ovl_cleanup_whiteouts(struct ovl_fs *ofs, struct dentry *upper, |
1007 | struct list_head *list) | |
e9be9d5e MS |
1008 | { |
1009 | struct ovl_cache_entry *p; | |
1010 | ||
5955102c | 1011 | inode_lock_nested(upper->d_inode, I_MUTEX_CHILD); |
e9be9d5e MS |
1012 | list_for_each_entry(p, list, l_node) { |
1013 | struct dentry *dentry; | |
1014 | ||
95e598e7 | 1015 | if (WARN_ON(!p->is_whiteout || !p->is_upper)) |
e9be9d5e MS |
1016 | continue; |
1017 | ||
22f289ce | 1018 | dentry = ovl_lookup_upper(ofs, p->name, upper, p->len); |
e9be9d5e | 1019 | if (IS_ERR(dentry)) { |
1bd0a3ae | 1020 | pr_err("lookup '%s/%.*s' failed (%i)\n", |
e9be9d5e MS |
1021 | upper->d_name.name, p->len, p->name, |
1022 | (int) PTR_ERR(dentry)); | |
1023 | continue; | |
1024 | } | |
84889d49 | 1025 | if (dentry->d_inode) |
576bb263 | 1026 | ovl_cleanup(ofs, upper->d_inode, dentry); |
e9be9d5e MS |
1027 | dput(dentry); |
1028 | } | |
5955102c | 1029 | inode_unlock(upper->d_inode); |
e9be9d5e | 1030 | } |
45aebeaf | 1031 | |
25885a35 | 1032 | static bool ovl_check_d_type(struct dir_context *ctx, const char *name, |
45aebeaf VG |
1033 | int namelen, loff_t offset, u64 ino, |
1034 | unsigned int d_type) | |
1035 | { | |
1036 | struct ovl_readdir_data *rdd = | |
1037 | container_of(ctx, struct ovl_readdir_data, ctx); | |
1038 | ||
1039 | /* Even if d_type is not supported, DT_DIR is returned for . and .. */ | |
1040 | if (!strncmp(name, ".", namelen) || !strncmp(name, "..", namelen)) | |
25885a35 | 1041 | return true; |
45aebeaf VG |
1042 | |
1043 | if (d_type != DT_UNKNOWN) | |
1044 | rdd->d_type_supported = true; | |
1045 | ||
25885a35 | 1046 | return true; |
45aebeaf VG |
1047 | } |
1048 | ||
1049 | /* | |
1050 | * Returns 1 if d_type is supported, 0 not supported/unknown. Negative values | |
1051 | * if error is encountered. | |
1052 | */ | |
2d343087 | 1053 | int ovl_check_d_type_supported(const struct path *realpath) |
45aebeaf VG |
1054 | { |
1055 | int err; | |
1056 | struct ovl_readdir_data rdd = { | |
1057 | .ctx.actor = ovl_check_d_type, | |
1058 | .d_type_supported = false, | |
1059 | }; | |
1060 | ||
1061 | err = ovl_dir_read(realpath, &rdd); | |
1062 | if (err) | |
1063 | return err; | |
1064 | ||
1065 | return rdd.d_type_supported; | |
1066 | } | |
eea2fb48 | 1067 | |
235ce9ed AG |
1068 | #define OVL_INCOMPATDIR_NAME "incompat" |
1069 | ||
2d343087 | 1070 | static int ovl_workdir_cleanup_recurse(struct ovl_fs *ofs, const struct path *path, |
576bb263 | 1071 | int level) |
eea2fb48 MS |
1072 | { |
1073 | int err; | |
1074 | struct inode *dir = path->dentry->d_inode; | |
1075 | LIST_HEAD(list); | |
1076 | struct ovl_cache_entry *p; | |
1077 | struct ovl_readdir_data rdd = { | |
af4dcb6d | 1078 | .ctx.actor = ovl_fill_plain, |
eea2fb48 | 1079 | .list = &list, |
eea2fb48 | 1080 | }; |
235ce9ed AG |
1081 | bool incompat = false; |
1082 | ||
1083 | /* | |
1084 | * The "work/incompat" directory is treated specially - if it is not | |
1085 | * empty, instead of printing a generic error and mounting read-only, | |
1086 | * we will error about incompat features and fail the mount. | |
1087 | * | |
1088 | * When called from ovl_indexdir_cleanup(), path->dentry->d_name.name | |
1089 | * starts with '#'. | |
1090 | */ | |
1091 | if (level == 2 && | |
1092 | !strcmp(path->dentry->d_name.name, OVL_INCOMPATDIR_NAME)) | |
1093 | incompat = true; | |
eea2fb48 MS |
1094 | |
1095 | err = ovl_dir_read(path, &rdd); | |
1096 | if (err) | |
1097 | goto out; | |
1098 | ||
1099 | inode_lock_nested(dir, I_MUTEX_PARENT); | |
1100 | list_for_each_entry(p, &list, l_node) { | |
1101 | struct dentry *dentry; | |
1102 | ||
1103 | if (p->name[0] == '.') { | |
1104 | if (p->len == 1) | |
1105 | continue; | |
1106 | if (p->len == 2 && p->name[1] == '.') | |
1107 | continue; | |
235ce9ed AG |
1108 | } else if (incompat) { |
1109 | pr_err("overlay with incompat feature '%s' cannot be mounted\n", | |
1110 | p->name); | |
1111 | err = -EINVAL; | |
1112 | break; | |
eea2fb48 | 1113 | } |
22f289ce | 1114 | dentry = ovl_lookup_upper(ofs, p->name, path->dentry, p->len); |
eea2fb48 MS |
1115 | if (IS_ERR(dentry)) |
1116 | continue; | |
1117 | if (dentry->d_inode) | |
576bb263 | 1118 | err = ovl_workdir_cleanup(ofs, dir, path->mnt, dentry, level); |
eea2fb48 | 1119 | dput(dentry); |
235ce9ed AG |
1120 | if (err) |
1121 | break; | |
eea2fb48 MS |
1122 | } |
1123 | inode_unlock(dir); | |
1124 | out: | |
1125 | ovl_cache_free(&list); | |
235ce9ed | 1126 | return err; |
eea2fb48 MS |
1127 | } |
1128 | ||
576bb263 CB |
1129 | int ovl_workdir_cleanup(struct ovl_fs *ofs, struct inode *dir, |
1130 | struct vfsmount *mnt, struct dentry *dentry, int level) | |
eea2fb48 MS |
1131 | { |
1132 | int err; | |
1133 | ||
1134 | if (!d_is_dir(dentry) || level > 1) { | |
576bb263 | 1135 | return ovl_cleanup(ofs, dir, dentry); |
eea2fb48 MS |
1136 | } |
1137 | ||
576bb263 | 1138 | err = ovl_do_rmdir(ofs, dir, dentry); |
eea2fb48 MS |
1139 | if (err) { |
1140 | struct path path = { .mnt = mnt, .dentry = dentry }; | |
1141 | ||
1142 | inode_unlock(dir); | |
576bb263 | 1143 | err = ovl_workdir_cleanup_recurse(ofs, &path, level + 1); |
eea2fb48 | 1144 | inode_lock_nested(dir, I_MUTEX_PARENT); |
235ce9ed | 1145 | if (!err) |
576bb263 | 1146 | err = ovl_cleanup(ofs, dir, dentry); |
eea2fb48 | 1147 | } |
3011645b AG |
1148 | |
1149 | return err; | |
eea2fb48 | 1150 | } |
415543d5 | 1151 | |
1eff1a1d | 1152 | int ovl_indexdir_cleanup(struct ovl_fs *ofs) |
415543d5 AG |
1153 | { |
1154 | int err; | |
1eff1a1d | 1155 | struct dentry *indexdir = ofs->indexdir; |
dc7ab677 | 1156 | struct dentry *index = NULL; |
1eff1a1d | 1157 | struct inode *dir = indexdir->d_inode; |
08f4c7c8 | 1158 | struct path path = { .mnt = ovl_upper_mnt(ofs), .dentry = indexdir }; |
415543d5 AG |
1159 | LIST_HEAD(list); |
1160 | struct ovl_cache_entry *p; | |
1161 | struct ovl_readdir_data rdd = { | |
af4dcb6d | 1162 | .ctx.actor = ovl_fill_plain, |
415543d5 | 1163 | .list = &list, |
415543d5 AG |
1164 | }; |
1165 | ||
1166 | err = ovl_dir_read(&path, &rdd); | |
1167 | if (err) | |
1168 | goto out; | |
1169 | ||
1170 | inode_lock_nested(dir, I_MUTEX_PARENT); | |
1171 | list_for_each_entry(p, &list, l_node) { | |
415543d5 AG |
1172 | if (p->name[0] == '.') { |
1173 | if (p->len == 1) | |
1174 | continue; | |
1175 | if (p->len == 2 && p->name[1] == '.') | |
1176 | continue; | |
1177 | } | |
22f289ce | 1178 | index = ovl_lookup_upper(ofs, p->name, indexdir, p->len); |
415543d5 AG |
1179 | if (IS_ERR(index)) { |
1180 | err = PTR_ERR(index); | |
dc7ab677 | 1181 | index = NULL; |
415543d5 AG |
1182 | break; |
1183 | } | |
3011645b AG |
1184 | /* Cleanup leftover from index create/cleanup attempt */ |
1185 | if (index->d_name.name[0] == '#') { | |
576bb263 | 1186 | err = ovl_workdir_cleanup(ofs, dir, path.mnt, index, 1); |
3011645b AG |
1187 | if (err) |
1188 | break; | |
1189 | goto next; | |
1190 | } | |
1eff1a1d | 1191 | err = ovl_verify_index(ofs, index); |
24f0b172 AG |
1192 | if (!err) { |
1193 | goto next; | |
1194 | } else if (err == -ESTALE) { | |
1195 | /* Cleanup stale index entries */ | |
576bb263 | 1196 | err = ovl_cleanup(ofs, dir, index); |
24f0b172 AG |
1197 | } else if (err != -ENOENT) { |
1198 | /* | |
1199 | * Abort mount to avoid corrupting the index if | |
1200 | * an incompatible index entry was found or on out | |
1201 | * of memory. | |
1202 | */ | |
1203 | break; | |
1204 | } else if (ofs->config.nfs_export) { | |
1205 | /* | |
1206 | * Whiteout orphan index to block future open by | |
1207 | * handle after overlay nlink dropped to zero. | |
1208 | */ | |
c21c839b | 1209 | err = ovl_cleanup_and_whiteout(ofs, dir, index); |
24f0b172 AG |
1210 | } else { |
1211 | /* Cleanup orphan index entries */ | |
576bb263 | 1212 | err = ovl_cleanup(ofs, dir, index); |
24f0b172 AG |
1213 | } |
1214 | ||
fa0096e3 AG |
1215 | if (err) |
1216 | break; | |
1217 | ||
24f0b172 | 1218 | next: |
415543d5 | 1219 | dput(index); |
dc7ab677 | 1220 | index = NULL; |
415543d5 | 1221 | } |
dc7ab677 | 1222 | dput(index); |
415543d5 AG |
1223 | inode_unlock(dir); |
1224 | out: | |
1225 | ovl_cache_free(&list); | |
1226 | if (err) | |
1bd0a3ae | 1227 | pr_err("failed index dir cleanup (%i)\n", err); |
415543d5 AG |
1228 | return err; |
1229 | } |