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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 | ||
fb5bb2c3 | 7 | #include <linux/module.h> |
e9be9d5e MS |
8 | #include <linux/fs.h> |
9 | #include <linux/slab.h> | |
10 | #include <linux/file.h> | |
72db8211 | 11 | #include <linux/fileattr.h> |
e9be9d5e MS |
12 | #include <linux/splice.h> |
13 | #include <linux/xattr.h> | |
14 | #include <linux/security.h> | |
15 | #include <linux/uaccess.h> | |
174cd4b1 | 16 | #include <linux/sched/signal.h> |
5b825c3a | 17 | #include <linux/cred.h> |
e9be9d5e | 18 | #include <linux/namei.h> |
fb5bb2c3 DH |
19 | #include <linux/fdtable.h> |
20 | #include <linux/ratelimit.h> | |
3a1e819b | 21 | #include <linux/exportfs.h> |
e9be9d5e MS |
22 | #include "overlayfs.h" |
23 | ||
24 | #define OVL_COPY_UP_CHUNK_SIZE (1 << 20) | |
25 | ||
670c2324 | 26 | static int ovl_ccup_set(const char *buf, const struct kernel_param *param) |
fb5bb2c3 | 27 | { |
1bd0a3ae | 28 | pr_warn("\"check_copy_up\" module option is obsolete\n"); |
fb5bb2c3 DH |
29 | return 0; |
30 | } | |
31 | ||
670c2324 | 32 | static int ovl_ccup_get(char *buf, const struct kernel_param *param) |
fb5bb2c3 | 33 | { |
670c2324 | 34 | return sprintf(buf, "N\n"); |
fb5bb2c3 DH |
35 | } |
36 | ||
670c2324 | 37 | module_param_call(check_copy_up, ovl_ccup_set, ovl_ccup_get, NULL, 0644); |
253e7483 | 38 | MODULE_PARM_DESC(check_copy_up, "Obsolete; does nothing"); |
670c2324 | 39 | |
c61ca557 MS |
40 | static bool ovl_must_copy_xattr(const char *name) |
41 | { | |
42 | return !strcmp(name, XATTR_POSIX_ACL_ACCESS) || | |
43 | !strcmp(name, XATTR_POSIX_ACL_DEFAULT) || | |
44 | !strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN); | |
45 | } | |
46 | ||
610afc0b MS |
47 | int ovl_copy_xattr(struct super_block *sb, struct dentry *old, |
48 | struct dentry *new) | |
e9be9d5e | 49 | { |
e4ad29fa VC |
50 | ssize_t list_size, size, value_size = 0; |
51 | char *buf, *name, *value = NULL; | |
520da69d | 52 | int error = 0; |
8b326c61 | 53 | size_t slen; |
e9be9d5e | 54 | |
5d6c3191 AG |
55 | if (!(old->d_inode->i_opflags & IOP_XATTR) || |
56 | !(new->d_inode->i_opflags & IOP_XATTR)) | |
e9be9d5e MS |
57 | return 0; |
58 | ||
59 | list_size = vfs_listxattr(old, NULL, 0); | |
60 | if (list_size <= 0) { | |
61 | if (list_size == -EOPNOTSUPP) | |
62 | return 0; | |
63 | return list_size; | |
64 | } | |
65 | ||
66 | buf = kzalloc(list_size, GFP_KERNEL); | |
67 | if (!buf) | |
68 | return -ENOMEM; | |
69 | ||
e9be9d5e MS |
70 | list_size = vfs_listxattr(old, buf, list_size); |
71 | if (list_size <= 0) { | |
72 | error = list_size; | |
e4ad29fa | 73 | goto out; |
e9be9d5e MS |
74 | } |
75 | ||
8b326c61 MS |
76 | for (name = buf; list_size; name += slen) { |
77 | slen = strnlen(name, list_size) + 1; | |
78 | ||
79 | /* underlying fs providing us with an broken xattr list? */ | |
80 | if (WARN_ON(slen > list_size)) { | |
81 | error = -EIO; | |
82 | break; | |
83 | } | |
84 | list_size -= slen; | |
85 | ||
610afc0b | 86 | if (ovl_is_private_xattr(sb, name)) |
0956254a | 87 | continue; |
03fedf93 AG |
88 | |
89 | error = security_inode_copy_up_xattr(name); | |
90 | if (error < 0 && error != -EOPNOTSUPP) | |
91 | break; | |
92 | if (error == 1) { | |
93 | error = 0; | |
94 | continue; /* Discard */ | |
95 | } | |
e4ad29fa | 96 | retry: |
c7c7a1a1 | 97 | size = vfs_getxattr(&init_user_ns, old, name, value, value_size); |
e4ad29fa | 98 | if (size == -ERANGE) |
c7c7a1a1 | 99 | size = vfs_getxattr(&init_user_ns, old, name, NULL, 0); |
e4ad29fa | 100 | |
97daf8b9 | 101 | if (size < 0) { |
e9be9d5e | 102 | error = size; |
e4ad29fa | 103 | break; |
e9be9d5e | 104 | } |
e4ad29fa VC |
105 | |
106 | if (size > value_size) { | |
107 | void *new; | |
108 | ||
109 | new = krealloc(value, size, GFP_KERNEL); | |
110 | if (!new) { | |
111 | error = -ENOMEM; | |
112 | break; | |
113 | } | |
114 | value = new; | |
115 | value_size = size; | |
116 | goto retry; | |
117 | } | |
118 | ||
c7c7a1a1 | 119 | error = vfs_setxattr(&init_user_ns, new, name, value, size, 0); |
c61ca557 MS |
120 | if (error) { |
121 | if (error != -EOPNOTSUPP || ovl_must_copy_xattr(name)) | |
122 | break; | |
123 | ||
124 | /* Ignore failure to copy unknown xattrs */ | |
125 | error = 0; | |
126 | } | |
e9be9d5e | 127 | } |
e9be9d5e MS |
128 | kfree(value); |
129 | out: | |
130 | kfree(buf); | |
131 | return error; | |
132 | } | |
133 | ||
096a218a AG |
134 | static int ovl_copy_fileattr(struct inode *inode, struct path *old, |
135 | struct path *new) | |
72db8211 AG |
136 | { |
137 | struct fileattr oldfa = { .flags_valid = true }; | |
138 | struct fileattr newfa = { .flags_valid = true }; | |
139 | int err; | |
140 | ||
141 | err = ovl_real_fileattr_get(old, &oldfa); | |
142 | if (err) | |
143 | return err; | |
144 | ||
145 | err = ovl_real_fileattr_get(new, &newfa); | |
146 | if (err) | |
147 | return err; | |
148 | ||
096a218a AG |
149 | /* |
150 | * We cannot set immutable and append-only flags on upper inode, | |
151 | * because we would not be able to link upper inode to upper dir | |
152 | * not set overlay private xattr on upper inode. | |
153 | * Store these flags in overlay.protattr xattr instead. | |
154 | */ | |
155 | if (oldfa.flags & OVL_PROT_FS_FLAGS_MASK) { | |
156 | err = ovl_set_protattr(inode, new->dentry, &oldfa); | |
157 | if (err) | |
158 | return err; | |
159 | } | |
160 | ||
72db8211 AG |
161 | BUILD_BUG_ON(OVL_COPY_FS_FLAGS_MASK & ~FS_COMMON_FL); |
162 | newfa.flags &= ~OVL_COPY_FS_FLAGS_MASK; | |
163 | newfa.flags |= (oldfa.flags & OVL_COPY_FS_FLAGS_MASK); | |
164 | ||
165 | BUILD_BUG_ON(OVL_COPY_FSX_FLAGS_MASK & ~FS_XFLAG_COMMON); | |
166 | newfa.fsx_xflags &= ~OVL_COPY_FSX_FLAGS_MASK; | |
167 | newfa.fsx_xflags |= (oldfa.fsx_xflags & OVL_COPY_FSX_FLAGS_MASK); | |
168 | ||
169 | return ovl_real_fileattr_set(new, &newfa); | |
170 | } | |
171 | ||
c86243b0 VG |
172 | static int ovl_copy_up_data(struct ovl_fs *ofs, struct path *old, |
173 | struct path *new, loff_t len) | |
e9be9d5e MS |
174 | { |
175 | struct file *old_file; | |
176 | struct file *new_file; | |
177 | loff_t old_pos = 0; | |
178 | loff_t new_pos = 0; | |
42ec3d4c | 179 | loff_t cloned; |
b504c654 CX |
180 | loff_t data_pos = -1; |
181 | loff_t hole_len; | |
182 | bool skip_hole = false; | |
e9be9d5e MS |
183 | int error = 0; |
184 | ||
185 | if (len == 0) | |
186 | return 0; | |
187 | ||
0480334f | 188 | old_file = ovl_path_open(old, O_LARGEFILE | O_RDONLY); |
e9be9d5e MS |
189 | if (IS_ERR(old_file)) |
190 | return PTR_ERR(old_file); | |
191 | ||
0480334f | 192 | new_file = ovl_path_open(new, O_LARGEFILE | O_WRONLY); |
e9be9d5e MS |
193 | if (IS_ERR(new_file)) { |
194 | error = PTR_ERR(new_file); | |
195 | goto out_fput; | |
196 | } | |
197 | ||
2ea98466 | 198 | /* Try to use clone_file_range to clone up within the same fs */ |
452ce659 | 199 | cloned = do_clone_file_range(old_file, 0, new_file, 0, len, 0); |
42ec3d4c | 200 | if (cloned == len) |
2ea98466 AG |
201 | goto out; |
202 | /* Couldn't clone, so now we try to copy the data */ | |
2ea98466 | 203 | |
b504c654 CX |
204 | /* Check if lower fs supports seek operation */ |
205 | if (old_file->f_mode & FMODE_LSEEK && | |
206 | old_file->f_op->llseek) | |
207 | skip_hole = true; | |
208 | ||
e9be9d5e MS |
209 | while (len) { |
210 | size_t this_len = OVL_COPY_UP_CHUNK_SIZE; | |
211 | long bytes; | |
212 | ||
213 | if (len < this_len) | |
214 | this_len = len; | |
215 | ||
216 | if (signal_pending_state(TASK_KILLABLE, current)) { | |
217 | error = -EINTR; | |
218 | break; | |
219 | } | |
220 | ||
b504c654 CX |
221 | /* |
222 | * Fill zero for hole will cost unnecessary disk space | |
223 | * and meanwhile slow down the copy-up speed, so we do | |
224 | * an optimization for hole during copy-up, it relies | |
225 | * on SEEK_DATA implementation in lower fs so if lower | |
226 | * fs does not support it, copy-up will behave as before. | |
227 | * | |
228 | * Detail logic of hole detection as below: | |
229 | * When we detect next data position is larger than current | |
230 | * position we will skip that hole, otherwise we copy | |
231 | * data in the size of OVL_COPY_UP_CHUNK_SIZE. Actually, | |
232 | * it may not recognize all kind of holes and sometimes | |
233 | * only skips partial of hole area. However, it will be | |
234 | * enough for most of the use cases. | |
235 | */ | |
236 | ||
237 | if (skip_hole && data_pos < old_pos) { | |
238 | data_pos = vfs_llseek(old_file, old_pos, SEEK_DATA); | |
239 | if (data_pos > old_pos) { | |
240 | hole_len = data_pos - old_pos; | |
241 | len -= hole_len; | |
242 | old_pos = new_pos = data_pos; | |
243 | continue; | |
244 | } else if (data_pos == -ENXIO) { | |
245 | break; | |
246 | } else if (data_pos < 0) { | |
247 | skip_hole = false; | |
248 | } | |
249 | } | |
250 | ||
e9be9d5e MS |
251 | bytes = do_splice_direct(old_file, &old_pos, |
252 | new_file, &new_pos, | |
253 | this_len, SPLICE_F_MOVE); | |
254 | if (bytes <= 0) { | |
255 | error = bytes; | |
256 | break; | |
257 | } | |
258 | WARN_ON(old_pos != new_pos); | |
259 | ||
260 | len -= bytes; | |
261 | } | |
2ea98466 | 262 | out: |
c86243b0 | 263 | if (!error && ovl_should_sync(ofs)) |
641089c1 | 264 | error = vfs_fsync(new_file, 0); |
e9be9d5e MS |
265 | fput(new_file); |
266 | out_fput: | |
267 | fput(old_file); | |
268 | return error; | |
269 | } | |
270 | ||
0c288874 VG |
271 | static int ovl_set_size(struct dentry *upperdentry, struct kstat *stat) |
272 | { | |
273 | struct iattr attr = { | |
274 | .ia_valid = ATTR_SIZE, | |
275 | .ia_size = stat->size, | |
276 | }; | |
277 | ||
2f221d6f | 278 | return notify_change(&init_user_ns, upperdentry, &attr, NULL); |
0c288874 VG |
279 | } |
280 | ||
e9be9d5e MS |
281 | static int ovl_set_timestamps(struct dentry *upperdentry, struct kstat *stat) |
282 | { | |
283 | struct iattr attr = { | |
284 | .ia_valid = | |
285 | ATTR_ATIME | ATTR_MTIME | ATTR_ATIME_SET | ATTR_MTIME_SET, | |
286 | .ia_atime = stat->atime, | |
287 | .ia_mtime = stat->mtime, | |
288 | }; | |
289 | ||
2f221d6f | 290 | return notify_change(&init_user_ns, upperdentry, &attr, NULL); |
e9be9d5e MS |
291 | } |
292 | ||
293 | int ovl_set_attr(struct dentry *upperdentry, struct kstat *stat) | |
294 | { | |
295 | int err = 0; | |
296 | ||
297 | if (!S_ISLNK(stat->mode)) { | |
298 | struct iattr attr = { | |
299 | .ia_valid = ATTR_MODE, | |
300 | .ia_mode = stat->mode, | |
301 | }; | |
2f221d6f | 302 | err = notify_change(&init_user_ns, upperdentry, &attr, NULL); |
e9be9d5e MS |
303 | } |
304 | if (!err) { | |
305 | struct iattr attr = { | |
306 | .ia_valid = ATTR_UID | ATTR_GID, | |
307 | .ia_uid = stat->uid, | |
308 | .ia_gid = stat->gid, | |
309 | }; | |
2f221d6f | 310 | err = notify_change(&init_user_ns, upperdentry, &attr, NULL); |
e9be9d5e MS |
311 | } |
312 | if (!err) | |
313 | ovl_set_timestamps(upperdentry, stat); | |
314 | ||
315 | return err; | |
e9be9d5e MS |
316 | } |
317 | ||
1cdb0cb6 PT |
318 | struct ovl_fh *ovl_encode_real_fh(struct ovl_fs *ofs, struct dentry *real, |
319 | bool is_upper) | |
3a1e819b AG |
320 | { |
321 | struct ovl_fh *fh; | |
ec7bbb53 | 322 | int fh_type, dwords; |
3a1e819b | 323 | int buflen = MAX_HANDLE_SZ; |
05122443 | 324 | uuid_t *uuid = &real->d_sb->s_uuid; |
ec7bbb53 | 325 | int err; |
3a1e819b | 326 | |
ec7bbb53 AG |
327 | /* Make sure the real fid stays 32bit aligned */ |
328 | BUILD_BUG_ON(OVL_FH_FID_OFFSET % 4); | |
329 | BUILD_BUG_ON(MAX_HANDLE_SZ + OVL_FH_FID_OFFSET > 255); | |
330 | ||
331 | fh = kzalloc(buflen + OVL_FH_FID_OFFSET, GFP_KERNEL); | |
332 | if (!fh) | |
3a1e819b AG |
333 | return ERR_PTR(-ENOMEM); |
334 | ||
335 | /* | |
336 | * We encode a non-connectable file handle for non-dir, because we | |
337 | * only need to find the lower inode number and we don't want to pay | |
338 | * the price or reconnecting the dentry. | |
339 | */ | |
340 | dwords = buflen >> 2; | |
ec7bbb53 | 341 | fh_type = exportfs_encode_fh(real, (void *)fh->fb.fid, &dwords, 0); |
3a1e819b AG |
342 | buflen = (dwords << 2); |
343 | ||
ec7bbb53 | 344 | err = -EIO; |
3a1e819b AG |
345 | if (WARN_ON(fh_type < 0) || |
346 | WARN_ON(buflen > MAX_HANDLE_SZ) || | |
347 | WARN_ON(fh_type == FILEID_INVALID)) | |
ec7bbb53 | 348 | goto out_err; |
3a1e819b | 349 | |
cbe7fba8 AG |
350 | fh->fb.version = OVL_FH_VERSION; |
351 | fh->fb.magic = OVL_FH_MAGIC; | |
352 | fh->fb.type = fh_type; | |
353 | fh->fb.flags = OVL_FH_FLAG_CPU_ENDIAN; | |
54fb347e AG |
354 | /* |
355 | * When we will want to decode an overlay dentry from this handle | |
356 | * and all layers are on the same fs, if we get a disconncted real | |
357 | * dentry when we decode fid, the only way to tell if we should assign | |
358 | * it to upperdentry or to lowerstack is by checking this flag. | |
359 | */ | |
360 | if (is_upper) | |
cbe7fba8 | 361 | fh->fb.flags |= OVL_FH_FLAG_PATH_UPPER; |
ec7bbb53 | 362 | fh->fb.len = sizeof(fh->fb) + buflen; |
5830fb6b PT |
363 | if (ofs->config.uuid) |
364 | fh->fb.uuid = *uuid; | |
3a1e819b | 365 | |
3a1e819b | 366 | return fh; |
ec7bbb53 AG |
367 | |
368 | out_err: | |
369 | kfree(fh); | |
370 | return ERR_PTR(err); | |
3a1e819b AG |
371 | } |
372 | ||
a0c236b1 AG |
373 | int ovl_set_origin(struct ovl_fs *ofs, struct dentry *lower, |
374 | struct dentry *upper) | |
3a1e819b | 375 | { |
3a1e819b AG |
376 | const struct ovl_fh *fh = NULL; |
377 | int err; | |
378 | ||
379 | /* | |
380 | * When lower layer doesn't support export operations store a 'null' fh, | |
381 | * so we can use the overlay.origin xattr to distignuish between a copy | |
382 | * up and a pure upper inode. | |
383 | */ | |
02bcd157 | 384 | if (ovl_can_decode_fh(lower->d_sb)) { |
1cdb0cb6 | 385 | fh = ovl_encode_real_fh(ofs, lower, false); |
3a1e819b AG |
386 | if (IS_ERR(fh)) |
387 | return PTR_ERR(fh); | |
388 | } | |
389 | ||
6266d465 MS |
390 | /* |
391 | * Do not fail when upper doesn't support xattrs. | |
392 | */ | |
a0c236b1 | 393 | err = ovl_check_setxattr(ofs, upper, OVL_XATTR_ORIGIN, fh->buf, |
cbe7fba8 | 394 | fh ? fh->fb.len : 0, 0); |
3a1e819b AG |
395 | kfree(fh); |
396 | ||
6939f977 MS |
397 | /* Ignore -EPERM from setting "user.*" on symlink/special */ |
398 | return err == -EPERM ? 0 : err; | |
3a1e819b AG |
399 | } |
400 | ||
016b720f | 401 | /* Store file handle of @upper dir in @index dir entry */ |
610afc0b MS |
402 | static int ovl_set_upper_fh(struct ovl_fs *ofs, struct dentry *upper, |
403 | struct dentry *index) | |
016b720f AG |
404 | { |
405 | const struct ovl_fh *fh; | |
406 | int err; | |
407 | ||
1cdb0cb6 | 408 | fh = ovl_encode_real_fh(ofs, upper, true); |
016b720f AG |
409 | if (IS_ERR(fh)) |
410 | return PTR_ERR(fh); | |
411 | ||
610afc0b | 412 | err = ovl_do_setxattr(ofs, index, OVL_XATTR_UPPER, fh->buf, fh->fb.len); |
016b720f AG |
413 | |
414 | kfree(fh); | |
415 | return err; | |
416 | } | |
417 | ||
418 | /* | |
419 | * Create and install index entry. | |
420 | * | |
421 | * Caller must hold i_mutex on indexdir. | |
422 | */ | |
423 | static int ovl_create_index(struct dentry *dentry, struct dentry *origin, | |
424 | struct dentry *upper) | |
425 | { | |
1cdb0cb6 | 426 | struct ovl_fs *ofs = OVL_FS(dentry->d_sb); |
016b720f AG |
427 | struct dentry *indexdir = ovl_indexdir(dentry->d_sb); |
428 | struct inode *dir = d_inode(indexdir); | |
429 | struct dentry *index = NULL; | |
430 | struct dentry *temp = NULL; | |
431 | struct qstr name = { }; | |
432 | int err; | |
433 | ||
434 | /* | |
435 | * For now this is only used for creating index entry for directories, | |
436 | * because non-dir are copied up directly to index and then hardlinked | |
437 | * to upper dir. | |
438 | * | |
439 | * TODO: implement create index for non-dir, so we can call it when | |
440 | * encoding file handle for non-dir in case index does not exist. | |
441 | */ | |
442 | if (WARN_ON(!d_is_dir(dentry))) | |
443 | return -EIO; | |
444 | ||
445 | /* Directory not expected to be indexed before copy up */ | |
446 | if (WARN_ON(ovl_test_flag(OVL_INDEX, d_inode(dentry)))) | |
447 | return -EIO; | |
448 | ||
1cdb0cb6 | 449 | err = ovl_get_index_name(ofs, origin, &name); |
016b720f AG |
450 | if (err) |
451 | return err; | |
452 | ||
137ec526 | 453 | temp = ovl_create_temp(indexdir, OVL_CATTR(S_IFDIR | 0)); |
b148cba4 | 454 | err = PTR_ERR(temp); |
016b720f | 455 | if (IS_ERR(temp)) |
b148cba4 | 456 | goto free_name; |
016b720f | 457 | |
1cdb0cb6 | 458 | err = ovl_set_upper_fh(ofs, upper, temp); |
016b720f | 459 | if (err) |
b148cba4 | 460 | goto out; |
016b720f AG |
461 | |
462 | index = lookup_one_len(name.name, indexdir, name.len); | |
463 | if (IS_ERR(index)) { | |
464 | err = PTR_ERR(index); | |
465 | } else { | |
466 | err = ovl_do_rename(dir, temp, dir, index, 0); | |
467 | dput(index); | |
468 | } | |
016b720f | 469 | out: |
b148cba4 MS |
470 | if (err) |
471 | ovl_cleanup(dir, temp); | |
016b720f | 472 | dput(temp); |
b148cba4 | 473 | free_name: |
016b720f AG |
474 | kfree(name.name); |
475 | return err; | |
016b720f AG |
476 | } |
477 | ||
f4439de1 AG |
478 | struct ovl_copy_up_ctx { |
479 | struct dentry *parent; | |
480 | struct dentry *dentry; | |
481 | struct path lowerpath; | |
482 | struct kstat stat; | |
483 | struct kstat pstat; | |
484 | const char *link; | |
485 | struct dentry *destdir; | |
486 | struct qstr destname; | |
487 | struct dentry *workdir; | |
f4439de1 | 488 | bool origin; |
016b720f | 489 | bool indexed; |
44d5bf10 | 490 | bool metacopy; |
f4439de1 AG |
491 | }; |
492 | ||
493 | static int ovl_link_up(struct ovl_copy_up_ctx *c) | |
59be0971 AG |
494 | { |
495 | int err; | |
496 | struct dentry *upper; | |
f4439de1 | 497 | struct dentry *upperdir = ovl_dentry_upper(c->parent); |
59be0971 AG |
498 | struct inode *udir = d_inode(upperdir); |
499 | ||
f4439de1 AG |
500 | /* Mark parent "impure" because it may now contain non-pure upper */ |
501 | err = ovl_set_impure(c->parent, upperdir); | |
502 | if (err) | |
503 | return err; | |
504 | ||
505 | err = ovl_set_nlink_lower(c->dentry); | |
5f8415d6 AG |
506 | if (err) |
507 | return err; | |
508 | ||
59be0971 | 509 | inode_lock_nested(udir, I_MUTEX_PARENT); |
f4439de1 AG |
510 | upper = lookup_one_len(c->dentry->d_name.name, upperdir, |
511 | c->dentry->d_name.len); | |
59be0971 AG |
512 | err = PTR_ERR(upper); |
513 | if (!IS_ERR(upper)) { | |
6cf00764 | 514 | err = ovl_do_link(ovl_dentry_upper(c->dentry), udir, upper); |
59be0971 AG |
515 | dput(upper); |
516 | ||
f4439de1 AG |
517 | if (!err) { |
518 | /* Restore timestamps on parent (best effort) */ | |
519 | ovl_set_timestamps(upperdir, &c->pstat); | |
520 | ovl_dentry_set_upper_alias(c->dentry); | |
521 | } | |
59be0971 AG |
522 | } |
523 | inode_unlock(udir); | |
aa3ff3c1 AG |
524 | if (err) |
525 | return err; | |
526 | ||
527 | err = ovl_set_nlink_upper(c->dentry); | |
59be0971 AG |
528 | |
529 | return err; | |
530 | } | |
531 | ||
23f0ab13 | 532 | static int ovl_copy_up_inode(struct ovl_copy_up_ctx *c, struct dentry *temp) |
7d90b853 | 533 | { |
c86243b0 | 534 | struct ovl_fs *ofs = OVL_FS(c->dentry->d_sb); |
72db8211 AG |
535 | struct inode *inode = d_inode(c->dentry); |
536 | struct path upperpath, datapath; | |
7d90b853 MS |
537 | int err; |
538 | ||
72db8211 AG |
539 | ovl_path_upper(c->dentry, &upperpath); |
540 | if (WARN_ON(upperpath.dentry != NULL)) | |
541 | return -EIO; | |
542 | ||
543 | upperpath.dentry = temp; | |
544 | ||
5f32879e VG |
545 | /* |
546 | * Copy up data first and then xattrs. Writing data after | |
547 | * xattrs will remove security.capability xattr automatically. | |
548 | */ | |
549 | if (S_ISREG(c->stat.mode) && !c->metacopy) { | |
5f32879e | 550 | ovl_path_lowerdata(c->dentry, &datapath); |
c86243b0 VG |
551 | err = ovl_copy_up_data(ofs, &datapath, &upperpath, |
552 | c->stat.size); | |
5f32879e VG |
553 | if (err) |
554 | return err; | |
555 | } | |
556 | ||
610afc0b | 557 | err = ovl_copy_xattr(c->dentry->d_sb, c->lowerpath.dentry, temp); |
e9be9d5e | 558 | if (err) |
02209d10 | 559 | return err; |
e9be9d5e | 560 | |
72db8211 AG |
561 | if (inode->i_flags & OVL_COPY_I_FLAGS_MASK) { |
562 | /* | |
563 | * Copy the fileattr inode flags that are the source of already | |
564 | * copied i_flags | |
565 | */ | |
096a218a | 566 | err = ovl_copy_fileattr(inode, &c->lowerpath, &upperpath); |
72db8211 AG |
567 | if (err) |
568 | return err; | |
569 | } | |
570 | ||
3a1e819b AG |
571 | /* |
572 | * Store identifier of lower inode in upper inode xattr to | |
573 | * allow lookup of the copy up origin inode. | |
fbaf94ee MS |
574 | * |
575 | * Don't set origin when we are breaking the association with a lower | |
576 | * hard link. | |
3a1e819b | 577 | */ |
59be0971 | 578 | if (c->origin) { |
a0c236b1 | 579 | err = ovl_set_origin(ofs, c->lowerpath.dentry, temp); |
fbaf94ee | 580 | if (err) |
02209d10 | 581 | return err; |
fbaf94ee | 582 | } |
3a1e819b | 583 | |
0c288874 | 584 | if (c->metacopy) { |
a0c236b1 | 585 | err = ovl_check_setxattr(ofs, temp, OVL_XATTR_METACOPY, |
0c288874 VG |
586 | NULL, 0, -EOPNOTSUPP); |
587 | if (err) | |
588 | return err; | |
589 | } | |
590 | ||
bd64e575 | 591 | inode_lock(temp->d_inode); |
b504c654 | 592 | if (S_ISREG(c->stat.mode)) |
0c288874 VG |
593 | err = ovl_set_size(temp, &c->stat); |
594 | if (!err) | |
595 | err = ovl_set_attr(temp, &c->stat); | |
bd64e575 VG |
596 | inode_unlock(temp->d_inode); |
597 | ||
598 | return err; | |
02209d10 AG |
599 | } |
600 | ||
6b52243f MS |
601 | struct ovl_cu_creds { |
602 | const struct cred *old; | |
603 | struct cred *new; | |
604 | }; | |
605 | ||
606 | static int ovl_prep_cu_creds(struct dentry *dentry, struct ovl_cu_creds *cc) | |
b10cdcdc AG |
607 | { |
608 | int err; | |
b10cdcdc | 609 | |
6b52243f MS |
610 | cc->old = cc->new = NULL; |
611 | err = security_inode_copy_up(dentry, &cc->new); | |
b10cdcdc | 612 | if (err < 0) |
6b52243f | 613 | return err; |
b10cdcdc | 614 | |
6b52243f MS |
615 | if (cc->new) |
616 | cc->old = override_creds(cc->new); | |
b10cdcdc | 617 | |
6b52243f | 618 | return 0; |
b10cdcdc AG |
619 | } |
620 | ||
6b52243f | 621 | static void ovl_revert_cu_creds(struct ovl_cu_creds *cc) |
b10cdcdc | 622 | { |
6b52243f MS |
623 | if (cc->new) { |
624 | revert_creds(cc->old); | |
625 | put_cred(cc->new); | |
626 | } | |
b10cdcdc AG |
627 | } |
628 | ||
629 | /* | |
630 | * Copyup using workdir to prepare temp file. Used when copying up directories, | |
631 | * special files or when upper fs doesn't support O_TMPFILE. | |
632 | */ | |
633 | static int ovl_copy_up_workdir(struct ovl_copy_up_ctx *c) | |
02209d10 | 634 | { |
b79e05aa | 635 | struct inode *inode; |
6b52243f MS |
636 | struct inode *udir = d_inode(c->destdir), *wdir = d_inode(c->workdir); |
637 | struct dentry *temp, *upper; | |
638 | struct ovl_cu_creds cc; | |
02209d10 | 639 | int err; |
6b52243f MS |
640 | struct ovl_cattr cattr = { |
641 | /* Can't properly set mode on creation because of the umask */ | |
642 | .mode = c->stat.mode & S_IFMT, | |
643 | .rdev = c->stat.rdev, | |
644 | .link = c->link | |
645 | }; | |
02209d10 | 646 | |
773cb4c5 AG |
647 | /* workdir and destdir could be the same when copying up to indexdir */ |
648 | err = -EIO; | |
649 | if (lock_rename(c->workdir, c->destdir) != NULL) | |
650 | goto unlock; | |
b10cdcdc | 651 | |
6b52243f MS |
652 | err = ovl_prep_cu_creds(c->dentry, &cc); |
653 | if (err) | |
654 | goto unlock; | |
655 | ||
656 | temp = ovl_create_temp(c->workdir, &cattr); | |
657 | ovl_revert_cu_creds(&cc); | |
658 | ||
b10cdcdc | 659 | err = PTR_ERR(temp); |
b148cba4 | 660 | if (IS_ERR(temp)) |
b10cdcdc | 661 | goto unlock; |
02209d10 | 662 | |
23f0ab13 | 663 | err = ovl_copy_up_inode(c, temp); |
02209d10 | 664 | if (err) |
b10cdcdc | 665 | goto cleanup; |
02209d10 | 666 | |
016b720f AG |
667 | if (S_ISDIR(c->stat.mode) && c->indexed) { |
668 | err = ovl_create_index(c->dentry, c->lowerpath.dentry, temp); | |
669 | if (err) | |
b10cdcdc | 670 | goto cleanup; |
016b720f AG |
671 | } |
672 | ||
6b52243f MS |
673 | upper = lookup_one_len(c->destname.name, c->destdir, c->destname.len); |
674 | err = PTR_ERR(upper); | |
675 | if (IS_ERR(upper)) | |
676 | goto cleanup; | |
677 | ||
678 | err = ovl_do_rename(wdir, temp, udir, upper, 0); | |
679 | dput(upper); | |
e9be9d5e | 680 | if (err) |
b10cdcdc | 681 | goto cleanup; |
e9be9d5e | 682 | |
0c288874 VG |
683 | if (!c->metacopy) |
684 | ovl_set_upperdata(d_inode(c->dentry)); | |
b79e05aa | 685 | inode = d_inode(c->dentry); |
6b52243f | 686 | ovl_inode_update(inode, temp); |
b79e05aa AG |
687 | if (S_ISDIR(inode->i_mode)) |
688 | ovl_set_flag(OVL_WHITEOUTS, inode); | |
b10cdcdc AG |
689 | unlock: |
690 | unlock_rename(c->workdir, c->destdir); | |
691 | ||
692 | return err; | |
693 | ||
694 | cleanup: | |
6b52243f MS |
695 | ovl_cleanup(wdir, temp); |
696 | dput(temp); | |
697 | goto unlock; | |
b10cdcdc AG |
698 | } |
699 | ||
6b52243f MS |
700 | /* Copyup using O_TMPFILE which does not require cross dir locking */ |
701 | static int ovl_copy_up_tmpfile(struct ovl_copy_up_ctx *c) | |
b10cdcdc | 702 | { |
6b52243f MS |
703 | struct inode *udir = d_inode(c->destdir); |
704 | struct dentry *temp, *upper; | |
705 | struct ovl_cu_creds cc; | |
b10cdcdc | 706 | int err; |
b10cdcdc | 707 | |
6b52243f MS |
708 | err = ovl_prep_cu_creds(c->dentry, &cc); |
709 | if (err) | |
710 | return err; | |
b10cdcdc AG |
711 | |
712 | temp = ovl_do_tmpfile(c->workdir, c->stat.mode); | |
6b52243f | 713 | ovl_revert_cu_creds(&cc); |
b10cdcdc | 714 | |
6b52243f MS |
715 | if (IS_ERR(temp)) |
716 | return PTR_ERR(temp); | |
b10cdcdc | 717 | |
6b52243f MS |
718 | err = ovl_copy_up_inode(c, temp); |
719 | if (err) | |
720 | goto out_dput; | |
b10cdcdc AG |
721 | |
722 | inode_lock_nested(udir, I_MUTEX_PARENT); | |
723 | ||
724 | upper = lookup_one_len(c->destname.name, c->destdir, c->destname.len); | |
725 | err = PTR_ERR(upper); | |
6b52243f MS |
726 | if (!IS_ERR(upper)) { |
727 | err = ovl_do_link(temp, udir, upper); | |
728 | dput(upper); | |
729 | } | |
b10cdcdc AG |
730 | inode_unlock(udir); |
731 | ||
b10cdcdc | 732 | if (err) |
6b52243f | 733 | goto out_dput; |
b10cdcdc AG |
734 | |
735 | if (!c->metacopy) | |
736 | ovl_set_upperdata(d_inode(c->dentry)); | |
6b52243f | 737 | ovl_inode_update(d_inode(c->dentry), temp); |
b79e05aa | 738 | |
6b52243f MS |
739 | return 0; |
740 | ||
741 | out_dput: | |
42f269b9 | 742 | dput(temp); |
e9be9d5e | 743 | return err; |
e9be9d5e MS |
744 | } |
745 | ||
746 | /* | |
747 | * Copy up a single dentry | |
748 | * | |
a6c60655 MS |
749 | * All renames start with copy up of source if necessary. The actual |
750 | * rename will only proceed once the copy up was successful. Copy up uses | |
751 | * upper parent i_mutex for exclusion. Since rename can change d_parent it | |
752 | * is possible that the copy up will lock the old parent. At that point | |
753 | * the file will have already been copied up anyway. | |
e9be9d5e | 754 | */ |
a6fb235a | 755 | static int ovl_do_copy_up(struct ovl_copy_up_ctx *c) |
e9be9d5e | 756 | { |
e9be9d5e | 757 | int err; |
1cdb0cb6 | 758 | struct ovl_fs *ofs = OVL_FS(c->dentry->d_sb); |
016b720f | 759 | bool to_index = false; |
59be0971 | 760 | |
016b720f AG |
761 | /* |
762 | * Indexed non-dir is copied up directly to the index entry and then | |
763 | * hardlinked to upper dir. Indexed dir is copied up to indexdir, | |
764 | * then index entry is created and then copied up dir installed. | |
765 | * Copying dir up to indexdir instead of workdir simplifies locking. | |
766 | */ | |
767 | if (ovl_need_index(c->dentry)) { | |
768 | c->indexed = true; | |
769 | if (S_ISDIR(c->stat.mode)) | |
770 | c->workdir = ovl_indexdir(c->dentry->d_sb); | |
771 | else | |
772 | to_index = true; | |
773 | } | |
774 | ||
775 | if (S_ISDIR(c->stat.mode) || c->stat.nlink == 1 || to_index) | |
59be0971 AG |
776 | c->origin = true; |
777 | ||
016b720f | 778 | if (to_index) { |
59be0971 | 779 | c->destdir = ovl_indexdir(c->dentry->d_sb); |
1cdb0cb6 | 780 | err = ovl_get_index_name(ofs, c->lowerpath.dentry, &c->destname); |
59be0971 AG |
781 | if (err) |
782 | return err; | |
aa3ff3c1 AG |
783 | } else if (WARN_ON(!c->parent)) { |
784 | /* Disconnected dentry must be copied up to index dir */ | |
785 | return -EIO; | |
59be0971 AG |
786 | } else { |
787 | /* | |
788 | * Mark parent "impure" because it may now contain non-pure | |
789 | * upper | |
790 | */ | |
791 | err = ovl_set_impure(c->parent, c->destdir); | |
792 | if (err) | |
793 | return err; | |
794 | } | |
e9be9d5e | 795 | |
01ad3eb8 | 796 | /* Should we copyup with O_TMPFILE or with workdir? */ |
b10cdcdc AG |
797 | if (S_ISREG(c->stat.mode) && ofs->tmpfile) |
798 | err = ovl_copy_up_tmpfile(c); | |
799 | else | |
800 | err = ovl_copy_up_workdir(c); | |
aa3ff3c1 AG |
801 | if (err) |
802 | goto out; | |
803 | ||
804 | if (c->indexed) | |
016b720f AG |
805 | ovl_set_flag(OVL_INDEX, d_inode(c->dentry)); |
806 | ||
807 | if (to_index) { | |
aa3ff3c1 AG |
808 | /* Initialize nlink for copy up of disconnected dentry */ |
809 | err = ovl_set_nlink_upper(c->dentry); | |
810 | } else { | |
59be0971 AG |
811 | struct inode *udir = d_inode(c->destdir); |
812 | ||
813 | /* Restore timestamps on parent (best effort) */ | |
814 | inode_lock(udir); | |
815 | ovl_set_timestamps(c->destdir, &c->pstat); | |
816 | inode_unlock(udir); | |
817 | ||
818 | ovl_dentry_set_upper_alias(c->dentry); | |
e9be9d5e MS |
819 | } |
820 | ||
aa3ff3c1 AG |
821 | out: |
822 | if (to_index) | |
823 | kfree(c->destname.name); | |
a6fb235a MS |
824 | return err; |
825 | } | |
826 | ||
44d5bf10 VG |
827 | static bool ovl_need_meta_copy_up(struct dentry *dentry, umode_t mode, |
828 | int flags) | |
829 | { | |
830 | struct ovl_fs *ofs = dentry->d_sb->s_fs_info; | |
831 | ||
44d5bf10 VG |
832 | if (!ofs->config.metacopy) |
833 | return false; | |
834 | ||
835 | if (!S_ISREG(mode)) | |
836 | return false; | |
837 | ||
838 | if (flags && ((OPEN_FMODE(flags) & FMODE_WRITE) || (flags & O_TRUNC))) | |
839 | return false; | |
840 | ||
841 | return true; | |
842 | } | |
843 | ||
de7a52c9 | 844 | static ssize_t ovl_getxattr(struct dentry *dentry, char *name, char **value) |
fee0f298 MS |
845 | { |
846 | ssize_t res; | |
de7a52c9 | 847 | char *buf; |
fee0f298 | 848 | |
c7c7a1a1 | 849 | res = vfs_getxattr(&init_user_ns, dentry, name, NULL, 0); |
de7a52c9 MS |
850 | if (res == -ENODATA || res == -EOPNOTSUPP) |
851 | res = 0; | |
fee0f298 | 852 | |
de7a52c9 MS |
853 | if (res > 0) { |
854 | buf = kzalloc(res, GFP_KERNEL); | |
fee0f298 MS |
855 | if (!buf) |
856 | return -ENOMEM; | |
857 | ||
c7c7a1a1 | 858 | res = vfs_getxattr(&init_user_ns, dentry, name, buf, res); |
fee0f298 | 859 | if (res < 0) |
de7a52c9 MS |
860 | kfree(buf); |
861 | else | |
862 | *value = buf; | |
fee0f298 | 863 | } |
fee0f298 MS |
864 | return res; |
865 | } | |
866 | ||
0c288874 VG |
867 | /* Copy up data of an inode which was copied up metadata only in the past. */ |
868 | static int ovl_copy_up_meta_inode_data(struct ovl_copy_up_ctx *c) | |
869 | { | |
c86243b0 | 870 | struct ovl_fs *ofs = OVL_FS(c->dentry->d_sb); |
4f93b426 | 871 | struct path upperpath, datapath; |
0c288874 | 872 | int err; |
993a0b2a | 873 | char *capability = NULL; |
3f649ab7 | 874 | ssize_t cap_size; |
0c288874 VG |
875 | |
876 | ovl_path_upper(c->dentry, &upperpath); | |
877 | if (WARN_ON(upperpath.dentry == NULL)) | |
878 | return -EIO; | |
879 | ||
4f93b426 VG |
880 | ovl_path_lowerdata(c->dentry, &datapath); |
881 | if (WARN_ON(datapath.dentry == NULL)) | |
882 | return -EIO; | |
883 | ||
993a0b2a VG |
884 | if (c->stat.size) { |
885 | err = cap_size = ovl_getxattr(upperpath.dentry, XATTR_NAME_CAPS, | |
de7a52c9 MS |
886 | &capability); |
887 | if (cap_size < 0) | |
993a0b2a VG |
888 | goto out; |
889 | } | |
890 | ||
c86243b0 | 891 | err = ovl_copy_up_data(ofs, &datapath, &upperpath, c->stat.size); |
0c288874 | 892 | if (err) |
993a0b2a VG |
893 | goto out_free; |
894 | ||
895 | /* | |
896 | * Writing to upper file will clear security.capability xattr. We | |
897 | * don't want that to happen for normal copy-up operation. | |
898 | */ | |
899 | if (capability) { | |
c7c7a1a1 TA |
900 | err = vfs_setxattr(&init_user_ns, upperpath.dentry, |
901 | XATTR_NAME_CAPS, capability, cap_size, 0); | |
993a0b2a VG |
902 | if (err) |
903 | goto out_free; | |
904 | } | |
905 | ||
0c288874 | 906 | |
610afc0b | 907 | err = ovl_do_removexattr(ofs, upperpath.dentry, OVL_XATTR_METACOPY); |
0c288874 | 908 | if (err) |
993a0b2a | 909 | goto out_free; |
0c288874 VG |
910 | |
911 | ovl_set_upperdata(d_inode(c->dentry)); | |
993a0b2a VG |
912 | out_free: |
913 | kfree(capability); | |
914 | out: | |
0c288874 VG |
915 | return err; |
916 | } | |
917 | ||
a6fb235a MS |
918 | static int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry, |
919 | int flags) | |
920 | { | |
921 | int err; | |
922 | DEFINE_DELAYED_CALL(done); | |
923 | struct path parentpath; | |
924 | struct ovl_copy_up_ctx ctx = { | |
925 | .parent = parent, | |
926 | .dentry = dentry, | |
927 | .workdir = ovl_workdir(dentry), | |
928 | }; | |
929 | ||
930 | if (WARN_ON(!ctx.workdir)) | |
931 | return -EROFS; | |
932 | ||
933 | ovl_path_lower(dentry, &ctx.lowerpath); | |
934 | err = vfs_getattr(&ctx.lowerpath, &ctx.stat, | |
935 | STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT); | |
936 | if (err) | |
937 | return err; | |
938 | ||
44d5bf10 VG |
939 | ctx.metacopy = ovl_need_meta_copy_up(dentry, ctx.stat.mode, flags); |
940 | ||
aa3ff3c1 AG |
941 | if (parent) { |
942 | ovl_path_upper(parent, &parentpath); | |
943 | ctx.destdir = parentpath.dentry; | |
944 | ctx.destname = dentry->d_name; | |
a6fb235a | 945 | |
aa3ff3c1 AG |
946 | err = vfs_getattr(&parentpath, &ctx.pstat, |
947 | STATX_ATIME | STATX_MTIME, | |
948 | AT_STATX_SYNC_AS_STAT); | |
949 | if (err) | |
950 | return err; | |
951 | } | |
a6fb235a MS |
952 | |
953 | /* maybe truncate regular file. this has no effect on dirs */ | |
954 | if (flags & O_TRUNC) | |
955 | ctx.stat.size = 0; | |
956 | ||
957 | if (S_ISLNK(ctx.stat.mode)) { | |
958 | ctx.link = vfs_get_link(ctx.lowerpath.dentry, &done); | |
959 | if (IS_ERR(ctx.link)) | |
960 | return PTR_ERR(ctx.link); | |
961 | } | |
a6fb235a | 962 | |
0c288874 | 963 | err = ovl_copy_up_start(dentry, flags); |
fd210b7d MS |
964 | /* err < 0: interrupted, err > 0: raced with another copy-up */ |
965 | if (unlikely(err)) { | |
966 | if (err > 0) | |
967 | err = 0; | |
968 | } else { | |
59be0971 AG |
969 | if (!ovl_dentry_upper(dentry)) |
970 | err = ovl_do_copy_up(&ctx); | |
aa3ff3c1 | 971 | if (!err && parent && !ovl_dentry_has_upper_alias(dentry)) |
f4439de1 | 972 | err = ovl_link_up(&ctx); |
0c288874 VG |
973 | if (!err && ovl_dentry_needs_data_copy_up_locked(dentry, flags)) |
974 | err = ovl_copy_up_meta_inode_data(&ctx); | |
fd210b7d MS |
975 | ovl_copy_up_end(dentry); |
976 | } | |
7764235b | 977 | do_delayed_call(&done); |
e9be9d5e MS |
978 | |
979 | return err; | |
980 | } | |
981 | ||
5ac8e802 | 982 | static int ovl_copy_up_flags(struct dentry *dentry, int flags) |
e9be9d5e | 983 | { |
8eac98b8 | 984 | int err = 0; |
7b279bbf | 985 | const struct cred *old_cred; |
aa3ff3c1 AG |
986 | bool disconnected = (dentry->d_flags & DCACHE_DISCONNECTED); |
987 | ||
988 | /* | |
989 | * With NFS export, copy up can get called for a disconnected non-dir. | |
990 | * In this case, we will copy up lower inode to index dir without | |
991 | * linking it to upper dir. | |
992 | */ | |
993 | if (WARN_ON(disconnected && d_is_dir(dentry))) | |
994 | return -EIO; | |
e9be9d5e | 995 | |
7b279bbf | 996 | old_cred = ovl_override_creds(dentry->d_sb); |
e9be9d5e MS |
997 | while (!err) { |
998 | struct dentry *next; | |
aa3ff3c1 | 999 | struct dentry *parent = NULL; |
e9be9d5e | 1000 | |
0c288874 | 1001 | if (ovl_already_copied_up(dentry, flags)) |
e9be9d5e MS |
1002 | break; |
1003 | ||
1004 | next = dget(dentry); | |
1005 | /* find the topmost dentry not yet copied up */ | |
aa3ff3c1 | 1006 | for (; !disconnected;) { |
e9be9d5e MS |
1007 | parent = dget_parent(next); |
1008 | ||
59be0971 | 1009 | if (ovl_dentry_upper(parent)) |
e9be9d5e MS |
1010 | break; |
1011 | ||
1012 | dput(next); | |
1013 | next = parent; | |
1014 | } | |
1015 | ||
a6fb235a | 1016 | err = ovl_copy_up_one(parent, next, flags); |
e9be9d5e MS |
1017 | |
1018 | dput(parent); | |
1019 | dput(next); | |
1020 | } | |
8eac98b8 | 1021 | revert_creds(old_cred); |
e9be9d5e MS |
1022 | |
1023 | return err; | |
1024 | } | |
9aba6521 | 1025 | |
d6eac039 VG |
1026 | static bool ovl_open_need_copy_up(struct dentry *dentry, int flags) |
1027 | { | |
1028 | /* Copy up of disconnected dentry does not set upper alias */ | |
0c288874 | 1029 | if (ovl_already_copied_up(dentry, flags)) |
d6eac039 VG |
1030 | return false; |
1031 | ||
1032 | if (special_file(d_inode(dentry)->i_mode)) | |
1033 | return false; | |
1034 | ||
0c288874 | 1035 | if (!ovl_open_flags_need_copy_up(flags)) |
d6eac039 VG |
1036 | return false; |
1037 | ||
1038 | return true; | |
1039 | } | |
1040 | ||
3428030d | 1041 | int ovl_maybe_copy_up(struct dentry *dentry, int flags) |
d6eac039 VG |
1042 | { |
1043 | int err = 0; | |
1044 | ||
3428030d | 1045 | if (ovl_open_need_copy_up(dentry, flags)) { |
d6eac039 VG |
1046 | err = ovl_want_write(dentry); |
1047 | if (!err) { | |
3428030d | 1048 | err = ovl_copy_up_flags(dentry, flags); |
d6eac039 VG |
1049 | ovl_drop_write(dentry); |
1050 | } | |
1051 | } | |
1052 | ||
1053 | return err; | |
1054 | } | |
1055 | ||
d1e6f6a9 VG |
1056 | int ovl_copy_up_with_data(struct dentry *dentry) |
1057 | { | |
1058 | return ovl_copy_up_flags(dentry, O_WRONLY); | |
1059 | } | |
1060 | ||
9aba6521 AG |
1061 | int ovl_copy_up(struct dentry *dentry) |
1062 | { | |
1063 | return ovl_copy_up_flags(dentry, 0); | |
1064 | } |