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Commit | Line | Data |
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e9be9d5e MS |
1 | /* |
2 | * | |
3 | * Copyright (C) 2011 Novell Inc. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License version 2 as published by | |
7 | * the Free Software Foundation. | |
8 | */ | |
9 | ||
fb5bb2c3 | 10 | #include <linux/module.h> |
e9be9d5e MS |
11 | #include <linux/fs.h> |
12 | #include <linux/slab.h> | |
13 | #include <linux/file.h> | |
14 | #include <linux/splice.h> | |
15 | #include <linux/xattr.h> | |
16 | #include <linux/security.h> | |
17 | #include <linux/uaccess.h> | |
174cd4b1 | 18 | #include <linux/sched/signal.h> |
5b825c3a | 19 | #include <linux/cred.h> |
e9be9d5e | 20 | #include <linux/namei.h> |
fb5bb2c3 DH |
21 | #include <linux/fdtable.h> |
22 | #include <linux/ratelimit.h> | |
3a1e819b | 23 | #include <linux/exportfs.h> |
e9be9d5e | 24 | #include "overlayfs.h" |
d8514d8e | 25 | #include "ovl_entry.h" |
e9be9d5e MS |
26 | |
27 | #define OVL_COPY_UP_CHUNK_SIZE (1 << 20) | |
28 | ||
fb5bb2c3 DH |
29 | static bool __read_mostly ovl_check_copy_up; |
30 | module_param_named(check_copy_up, ovl_check_copy_up, bool, | |
31 | S_IWUSR | S_IRUGO); | |
32 | MODULE_PARM_DESC(ovl_check_copy_up, | |
33 | "Warn on copy-up when causing process also has a R/O fd open"); | |
34 | ||
35 | static int ovl_check_fd(const void *data, struct file *f, unsigned int fd) | |
36 | { | |
37 | const struct dentry *dentry = data; | |
38 | ||
45063097 | 39 | if (file_inode(f) == d_inode(dentry)) |
fb5bb2c3 DH |
40 | pr_warn_ratelimited("overlayfs: Warning: Copying up %pD, but open R/O on fd %u which will cease to be coherent [pid=%d %s]\n", |
41 | f, fd, current->pid, current->comm); | |
42 | return 0; | |
43 | } | |
44 | ||
45 | /* | |
46 | * Check the fds open by this process and warn if something like the following | |
47 | * scenario is about to occur: | |
48 | * | |
49 | * fd1 = open("foo", O_RDONLY); | |
50 | * fd2 = open("foo", O_RDWR); | |
51 | */ | |
52 | static void ovl_do_check_copy_up(struct dentry *dentry) | |
53 | { | |
54 | if (ovl_check_copy_up) | |
55 | iterate_fd(current->files, 0, ovl_check_fd, dentry); | |
56 | } | |
57 | ||
e9be9d5e MS |
58 | int ovl_copy_xattr(struct dentry *old, struct dentry *new) |
59 | { | |
e4ad29fa VC |
60 | ssize_t list_size, size, value_size = 0; |
61 | char *buf, *name, *value = NULL; | |
62 | int uninitialized_var(error); | |
8b326c61 | 63 | size_t slen; |
e9be9d5e | 64 | |
5d6c3191 AG |
65 | if (!(old->d_inode->i_opflags & IOP_XATTR) || |
66 | !(new->d_inode->i_opflags & IOP_XATTR)) | |
e9be9d5e MS |
67 | return 0; |
68 | ||
69 | list_size = vfs_listxattr(old, NULL, 0); | |
70 | if (list_size <= 0) { | |
71 | if (list_size == -EOPNOTSUPP) | |
72 | return 0; | |
73 | return list_size; | |
74 | } | |
75 | ||
76 | buf = kzalloc(list_size, GFP_KERNEL); | |
77 | if (!buf) | |
78 | return -ENOMEM; | |
79 | ||
e9be9d5e MS |
80 | list_size = vfs_listxattr(old, buf, list_size); |
81 | if (list_size <= 0) { | |
82 | error = list_size; | |
e4ad29fa | 83 | goto out; |
e9be9d5e MS |
84 | } |
85 | ||
8b326c61 MS |
86 | for (name = buf; list_size; name += slen) { |
87 | slen = strnlen(name, list_size) + 1; | |
88 | ||
89 | /* underlying fs providing us with an broken xattr list? */ | |
90 | if (WARN_ON(slen > list_size)) { | |
91 | error = -EIO; | |
92 | break; | |
93 | } | |
94 | list_size -= slen; | |
95 | ||
0956254a MS |
96 | if (ovl_is_private_xattr(name)) |
97 | continue; | |
e4ad29fa VC |
98 | retry: |
99 | size = vfs_getxattr(old, name, value, value_size); | |
100 | if (size == -ERANGE) | |
101 | size = vfs_getxattr(old, name, NULL, 0); | |
102 | ||
97daf8b9 | 103 | if (size < 0) { |
e9be9d5e | 104 | error = size; |
e4ad29fa | 105 | break; |
e9be9d5e | 106 | } |
e4ad29fa VC |
107 | |
108 | if (size > value_size) { | |
109 | void *new; | |
110 | ||
111 | new = krealloc(value, size, GFP_KERNEL); | |
112 | if (!new) { | |
113 | error = -ENOMEM; | |
114 | break; | |
115 | } | |
116 | value = new; | |
117 | value_size = size; | |
118 | goto retry; | |
119 | } | |
120 | ||
121ab822 VG |
121 | error = security_inode_copy_up_xattr(name); |
122 | if (error < 0 && error != -EOPNOTSUPP) | |
123 | break; | |
124 | if (error == 1) { | |
125 | error = 0; | |
126 | continue; /* Discard */ | |
127 | } | |
e9be9d5e MS |
128 | error = vfs_setxattr(new, name, value, size, 0); |
129 | if (error) | |
e4ad29fa | 130 | break; |
e9be9d5e | 131 | } |
e9be9d5e MS |
132 | kfree(value); |
133 | out: | |
134 | kfree(buf); | |
135 | return error; | |
136 | } | |
137 | ||
138 | static int ovl_copy_up_data(struct path *old, struct path *new, loff_t len) | |
139 | { | |
140 | struct file *old_file; | |
141 | struct file *new_file; | |
142 | loff_t old_pos = 0; | |
143 | loff_t new_pos = 0; | |
144 | int error = 0; | |
145 | ||
146 | if (len == 0) | |
147 | return 0; | |
148 | ||
0480334f | 149 | old_file = ovl_path_open(old, O_LARGEFILE | O_RDONLY); |
e9be9d5e MS |
150 | if (IS_ERR(old_file)) |
151 | return PTR_ERR(old_file); | |
152 | ||
0480334f | 153 | new_file = ovl_path_open(new, O_LARGEFILE | O_WRONLY); |
e9be9d5e MS |
154 | if (IS_ERR(new_file)) { |
155 | error = PTR_ERR(new_file); | |
156 | goto out_fput; | |
157 | } | |
158 | ||
2ea98466 AG |
159 | /* Try to use clone_file_range to clone up within the same fs */ |
160 | error = vfs_clone_file_range(old_file, 0, new_file, 0, len); | |
161 | if (!error) | |
162 | goto out; | |
163 | /* Couldn't clone, so now we try to copy the data */ | |
164 | error = 0; | |
165 | ||
e9be9d5e MS |
166 | /* FIXME: copy up sparse files efficiently */ |
167 | while (len) { | |
168 | size_t this_len = OVL_COPY_UP_CHUNK_SIZE; | |
169 | long bytes; | |
170 | ||
171 | if (len < this_len) | |
172 | this_len = len; | |
173 | ||
174 | if (signal_pending_state(TASK_KILLABLE, current)) { | |
175 | error = -EINTR; | |
176 | break; | |
177 | } | |
178 | ||
179 | bytes = do_splice_direct(old_file, &old_pos, | |
180 | new_file, &new_pos, | |
181 | this_len, SPLICE_F_MOVE); | |
182 | if (bytes <= 0) { | |
183 | error = bytes; | |
184 | break; | |
185 | } | |
186 | WARN_ON(old_pos != new_pos); | |
187 | ||
188 | len -= bytes; | |
189 | } | |
2ea98466 | 190 | out: |
641089c1 MS |
191 | if (!error) |
192 | error = vfs_fsync(new_file, 0); | |
e9be9d5e MS |
193 | fput(new_file); |
194 | out_fput: | |
195 | fput(old_file); | |
196 | return error; | |
197 | } | |
198 | ||
e9be9d5e MS |
199 | static int ovl_set_timestamps(struct dentry *upperdentry, struct kstat *stat) |
200 | { | |
201 | struct iattr attr = { | |
202 | .ia_valid = | |
203 | ATTR_ATIME | ATTR_MTIME | ATTR_ATIME_SET | ATTR_MTIME_SET, | |
204 | .ia_atime = stat->atime, | |
205 | .ia_mtime = stat->mtime, | |
206 | }; | |
207 | ||
208 | return notify_change(upperdentry, &attr, NULL); | |
209 | } | |
210 | ||
211 | int ovl_set_attr(struct dentry *upperdentry, struct kstat *stat) | |
212 | { | |
213 | int err = 0; | |
214 | ||
215 | if (!S_ISLNK(stat->mode)) { | |
216 | struct iattr attr = { | |
217 | .ia_valid = ATTR_MODE, | |
218 | .ia_mode = stat->mode, | |
219 | }; | |
220 | err = notify_change(upperdentry, &attr, NULL); | |
221 | } | |
222 | if (!err) { | |
223 | struct iattr attr = { | |
224 | .ia_valid = ATTR_UID | ATTR_GID, | |
225 | .ia_uid = stat->uid, | |
226 | .ia_gid = stat->gid, | |
227 | }; | |
228 | err = notify_change(upperdentry, &attr, NULL); | |
229 | } | |
230 | if (!err) | |
231 | ovl_set_timestamps(upperdentry, stat); | |
232 | ||
233 | return err; | |
e9be9d5e MS |
234 | } |
235 | ||
54fb347e | 236 | struct ovl_fh *ovl_encode_fh(struct dentry *lower, bool is_upper) |
3a1e819b AG |
237 | { |
238 | struct ovl_fh *fh; | |
239 | int fh_type, fh_len, dwords; | |
240 | void *buf; | |
241 | int buflen = MAX_HANDLE_SZ; | |
02bcd157 | 242 | uuid_t *uuid = &lower->d_sb->s_uuid; |
3a1e819b AG |
243 | |
244 | buf = kmalloc(buflen, GFP_TEMPORARY); | |
245 | if (!buf) | |
246 | return ERR_PTR(-ENOMEM); | |
247 | ||
248 | /* | |
249 | * We encode a non-connectable file handle for non-dir, because we | |
250 | * only need to find the lower inode number and we don't want to pay | |
251 | * the price or reconnecting the dentry. | |
252 | */ | |
253 | dwords = buflen >> 2; | |
254 | fh_type = exportfs_encode_fh(lower, buf, &dwords, 0); | |
255 | buflen = (dwords << 2); | |
256 | ||
257 | fh = ERR_PTR(-EIO); | |
258 | if (WARN_ON(fh_type < 0) || | |
259 | WARN_ON(buflen > MAX_HANDLE_SZ) || | |
260 | WARN_ON(fh_type == FILEID_INVALID)) | |
261 | goto out; | |
262 | ||
263 | BUILD_BUG_ON(MAX_HANDLE_SZ + offsetof(struct ovl_fh, fid) > 255); | |
264 | fh_len = offsetof(struct ovl_fh, fid) + buflen; | |
265 | fh = kmalloc(fh_len, GFP_KERNEL); | |
266 | if (!fh) { | |
267 | fh = ERR_PTR(-ENOMEM); | |
268 | goto out; | |
269 | } | |
270 | ||
271 | fh->version = OVL_FH_VERSION; | |
272 | fh->magic = OVL_FH_MAGIC; | |
273 | fh->type = fh_type; | |
274 | fh->flags = OVL_FH_FLAG_CPU_ENDIAN; | |
54fb347e AG |
275 | /* |
276 | * When we will want to decode an overlay dentry from this handle | |
277 | * and all layers are on the same fs, if we get a disconncted real | |
278 | * dentry when we decode fid, the only way to tell if we should assign | |
279 | * it to upperdentry or to lowerstack is by checking this flag. | |
280 | */ | |
281 | if (is_upper) | |
282 | fh->flags |= OVL_FH_FLAG_PATH_UPPER; | |
3a1e819b AG |
283 | fh->len = fh_len; |
284 | fh->uuid = *uuid; | |
285 | memcpy(fh->fid, buf, buflen); | |
286 | ||
287 | out: | |
288 | kfree(buf); | |
289 | return fh; | |
290 | } | |
291 | ||
292 | static int ovl_set_origin(struct dentry *dentry, struct dentry *lower, | |
293 | struct dentry *upper) | |
294 | { | |
3a1e819b AG |
295 | const struct ovl_fh *fh = NULL; |
296 | int err; | |
297 | ||
298 | /* | |
299 | * When lower layer doesn't support export operations store a 'null' fh, | |
300 | * so we can use the overlay.origin xattr to distignuish between a copy | |
301 | * up and a pure upper inode. | |
302 | */ | |
02bcd157 | 303 | if (ovl_can_decode_fh(lower->d_sb)) { |
54fb347e | 304 | fh = ovl_encode_fh(lower, false); |
3a1e819b AG |
305 | if (IS_ERR(fh)) |
306 | return PTR_ERR(fh); | |
307 | } | |
308 | ||
6266d465 MS |
309 | /* |
310 | * Do not fail when upper doesn't support xattrs. | |
311 | */ | |
312 | err = ovl_check_setxattr(dentry, upper, OVL_XATTR_ORIGIN, fh, | |
313 | fh ? fh->len : 0, 0); | |
3a1e819b AG |
314 | kfree(fh); |
315 | ||
316 | return err; | |
317 | } | |
318 | ||
e9be9d5e MS |
319 | static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir, |
320 | struct dentry *dentry, struct path *lowerpath, | |
42f269b9 | 321 | struct kstat *stat, const char *link, |
d8514d8e | 322 | struct kstat *pstat, bool tmpfile) |
e9be9d5e MS |
323 | { |
324 | struct inode *wdir = workdir->d_inode; | |
325 | struct inode *udir = upperdir->d_inode; | |
326 | struct dentry *newdentry = NULL; | |
327 | struct dentry *upper = NULL; | |
42f269b9 | 328 | struct dentry *temp = NULL; |
e9be9d5e | 329 | int err; |
d8ad8b49 VG |
330 | const struct cred *old_creds = NULL; |
331 | struct cred *new_creds = NULL; | |
32a3d848 AV |
332 | struct cattr cattr = { |
333 | /* Can't properly set mode on creation because of the umask */ | |
334 | .mode = stat->mode & S_IFMT, | |
335 | .rdev = stat->rdev, | |
336 | .link = link | |
337 | }; | |
e9be9d5e | 338 | |
d8ad8b49 VG |
339 | err = security_inode_copy_up(dentry, &new_creds); |
340 | if (err < 0) | |
e85f82ff | 341 | goto out; |
d8ad8b49 VG |
342 | |
343 | if (new_creds) | |
344 | old_creds = override_creds(new_creds); | |
345 | ||
d8514d8e AG |
346 | if (tmpfile) |
347 | temp = ovl_do_tmpfile(upperdir, stat->mode); | |
348 | else | |
3d27573c | 349 | temp = ovl_lookup_temp(workdir); |
d8514d8e | 350 | err = 0; |
8137ae26 AG |
351 | if (IS_ERR(temp)) { |
352 | err = PTR_ERR(temp); | |
353 | temp = NULL; | |
354 | } | |
355 | ||
356 | if (!err && !tmpfile) | |
d8514d8e | 357 | err = ovl_create_real(wdir, temp, &cattr, NULL, true); |
d8ad8b49 VG |
358 | |
359 | if (new_creds) { | |
360 | revert_creds(old_creds); | |
361 | put_cred(new_creds); | |
362 | } | |
363 | ||
e9be9d5e | 364 | if (err) |
e85f82ff | 365 | goto out; |
e9be9d5e MS |
366 | |
367 | if (S_ISREG(stat->mode)) { | |
368 | struct path upperpath; | |
f134f244 | 369 | |
e9be9d5e MS |
370 | ovl_path_upper(dentry, &upperpath); |
371 | BUG_ON(upperpath.dentry != NULL); | |
42f269b9 | 372 | upperpath.dentry = temp; |
e9be9d5e | 373 | |
01ad3eb8 AG |
374 | if (tmpfile) { |
375 | inode_unlock(udir); | |
376 | err = ovl_copy_up_data(lowerpath, &upperpath, | |
377 | stat->size); | |
378 | inode_lock_nested(udir, I_MUTEX_PARENT); | |
379 | } else { | |
380 | err = ovl_copy_up_data(lowerpath, &upperpath, | |
381 | stat->size); | |
382 | } | |
e9be9d5e | 383 | |
e9be9d5e MS |
384 | if (err) |
385 | goto out_cleanup; | |
386 | } | |
387 | ||
42f269b9 | 388 | err = ovl_copy_xattr(lowerpath->dentry, temp); |
e9be9d5e MS |
389 | if (err) |
390 | goto out_cleanup; | |
391 | ||
42f269b9 AG |
392 | inode_lock(temp->d_inode); |
393 | err = ovl_set_attr(temp, stat); | |
394 | inode_unlock(temp->d_inode); | |
e9be9d5e MS |
395 | if (err) |
396 | goto out_cleanup; | |
397 | ||
3a1e819b AG |
398 | /* |
399 | * Store identifier of lower inode in upper inode xattr to | |
400 | * allow lookup of the copy up origin inode. | |
fbaf94ee MS |
401 | * |
402 | * Don't set origin when we are breaking the association with a lower | |
403 | * hard link. | |
3a1e819b | 404 | */ |
fbaf94ee MS |
405 | if (S_ISDIR(stat->mode) || stat->nlink == 1) { |
406 | err = ovl_set_origin(dentry, lowerpath->dentry, temp); | |
407 | if (err) | |
408 | goto out_cleanup; | |
409 | } | |
3a1e819b | 410 | |
e85f82ff MS |
411 | upper = lookup_one_len(dentry->d_name.name, upperdir, |
412 | dentry->d_name.len); | |
413 | if (IS_ERR(upper)) { | |
414 | err = PTR_ERR(upper); | |
415 | upper = NULL; | |
416 | goto out_cleanup; | |
417 | } | |
418 | ||
d8514d8e AG |
419 | if (tmpfile) |
420 | err = ovl_do_link(temp, udir, upper, true); | |
421 | else | |
422 | err = ovl_do_rename(wdir, temp, udir, upper, 0); | |
e9be9d5e MS |
423 | if (err) |
424 | goto out_cleanup; | |
425 | ||
d8514d8e | 426 | newdentry = dget(tmpfile ? upper : temp); |
09d8b586 | 427 | ovl_inode_update(d_inode(dentry), newdentry); |
42f269b9 AG |
428 | |
429 | /* Restore timestamps on parent (best effort) */ | |
430 | ovl_set_timestamps(upperdir, pstat); | |
e85f82ff | 431 | out: |
42f269b9 | 432 | dput(temp); |
42f269b9 | 433 | dput(upper); |
e9be9d5e MS |
434 | return err; |
435 | ||
436 | out_cleanup: | |
d8514d8e AG |
437 | if (!tmpfile) |
438 | ovl_cleanup(wdir, temp); | |
e85f82ff | 439 | goto out; |
e9be9d5e MS |
440 | } |
441 | ||
442 | /* | |
443 | * Copy up a single dentry | |
444 | * | |
a6c60655 MS |
445 | * All renames start with copy up of source if necessary. The actual |
446 | * rename will only proceed once the copy up was successful. Copy up uses | |
447 | * upper parent i_mutex for exclusion. Since rename can change d_parent it | |
448 | * is possible that the copy up will lock the old parent. At that point | |
449 | * the file will have already been copied up anyway. | |
e9be9d5e | 450 | */ |
9aba6521 AG |
451 | static int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry, |
452 | struct path *lowerpath, struct kstat *stat) | |
e9be9d5e | 453 | { |
7764235b | 454 | DEFINE_DELAYED_CALL(done); |
e9be9d5e MS |
455 | struct dentry *workdir = ovl_workdir(dentry); |
456 | int err; | |
457 | struct kstat pstat; | |
458 | struct path parentpath; | |
7764235b | 459 | struct dentry *lowerdentry = lowerpath->dentry; |
e9be9d5e | 460 | struct dentry *upperdir; |
7764235b | 461 | const char *link = NULL; |
d8514d8e | 462 | struct ovl_fs *ofs = dentry->d_sb->s_fs_info; |
e9be9d5e | 463 | |
cc6f67bc MS |
464 | if (WARN_ON(!workdir)) |
465 | return -EROFS; | |
466 | ||
7764235b | 467 | ovl_do_check_copy_up(lowerdentry); |
fb5bb2c3 | 468 | |
e9be9d5e MS |
469 | ovl_path_upper(parent, &parentpath); |
470 | upperdir = parentpath.dentry; | |
471 | ||
f3a15685 AG |
472 | /* Mark parent "impure" because it may now contain non-pure upper */ |
473 | err = ovl_set_impure(parent, upperdir); | |
474 | if (err) | |
475 | return err; | |
476 | ||
a528d35e DH |
477 | err = vfs_getattr(&parentpath, &pstat, |
478 | STATX_ATIME | STATX_MTIME, AT_STATX_SYNC_AS_STAT); | |
e9be9d5e MS |
479 | if (err) |
480 | return err; | |
481 | ||
482 | if (S_ISLNK(stat->mode)) { | |
7764235b | 483 | link = vfs_get_link(lowerdentry, &done); |
e9be9d5e MS |
484 | if (IS_ERR(link)) |
485 | return PTR_ERR(link); | |
486 | } | |
487 | ||
01ad3eb8 AG |
488 | /* Should we copyup with O_TMPFILE or with workdir? */ |
489 | if (S_ISREG(stat->mode) && ofs->tmpfile) { | |
490 | err = ovl_copy_up_start(dentry); | |
491 | /* err < 0: interrupted, err > 0: raced with another copy-up */ | |
492 | if (unlikely(err)) { | |
493 | pr_debug("ovl_copy_up_start(%pd2) = %i\n", dentry, err); | |
494 | if (err > 0) | |
495 | err = 0; | |
496 | goto out_done; | |
497 | } | |
498 | ||
499 | inode_lock_nested(upperdir->d_inode, I_MUTEX_PARENT); | |
500 | err = ovl_copy_up_locked(workdir, upperdir, dentry, lowerpath, | |
501 | stat, link, &pstat, true); | |
502 | inode_unlock(upperdir->d_inode); | |
503 | ovl_copy_up_end(dentry); | |
504 | goto out_done; | |
505 | } | |
506 | ||
e9be9d5e MS |
507 | err = -EIO; |
508 | if (lock_rename(workdir, upperdir) != NULL) { | |
509 | pr_err("overlayfs: failed to lock workdir+upperdir\n"); | |
510 | goto out_unlock; | |
511 | } | |
a6c60655 | 512 | if (ovl_dentry_upper(dentry)) { |
0f7ff2da | 513 | /* Raced with another copy-up? Nothing to do, then... */ |
e9be9d5e | 514 | err = 0; |
0f7ff2da | 515 | goto out_unlock; |
e9be9d5e MS |
516 | } |
517 | ||
518 | err = ovl_copy_up_locked(workdir, upperdir, dentry, lowerpath, | |
01ad3eb8 | 519 | stat, link, &pstat, false); |
e9be9d5e MS |
520 | out_unlock: |
521 | unlock_rename(workdir, upperdir); | |
01ad3eb8 | 522 | out_done: |
7764235b | 523 | do_delayed_call(&done); |
e9be9d5e MS |
524 | |
525 | return err; | |
526 | } | |
527 | ||
9aba6521 | 528 | int ovl_copy_up_flags(struct dentry *dentry, int flags) |
e9be9d5e | 529 | { |
8eac98b8 VG |
530 | int err = 0; |
531 | const struct cred *old_cred = ovl_override_creds(dentry->d_sb); | |
e9be9d5e | 532 | |
e9be9d5e MS |
533 | while (!err) { |
534 | struct dentry *next; | |
535 | struct dentry *parent; | |
536 | struct path lowerpath; | |
537 | struct kstat stat; | |
538 | enum ovl_path_type type = ovl_path_type(dentry); | |
539 | ||
1afaba1e | 540 | if (OVL_TYPE_UPPER(type)) |
e9be9d5e MS |
541 | break; |
542 | ||
543 | next = dget(dentry); | |
544 | /* find the topmost dentry not yet copied up */ | |
545 | for (;;) { | |
546 | parent = dget_parent(next); | |
547 | ||
548 | type = ovl_path_type(parent); | |
1afaba1e | 549 | if (OVL_TYPE_UPPER(type)) |
e9be9d5e MS |
550 | break; |
551 | ||
552 | dput(next); | |
553 | next = parent; | |
554 | } | |
555 | ||
556 | ovl_path_lower(next, &lowerpath); | |
a528d35e DH |
557 | err = vfs_getattr(&lowerpath, &stat, |
558 | STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT); | |
9aba6521 AG |
559 | /* maybe truncate regular file. this has no effect on dirs */ |
560 | if (flags & O_TRUNC) | |
561 | stat.size = 0; | |
e9be9d5e | 562 | if (!err) |
0f7ff2da | 563 | err = ovl_copy_up_one(parent, next, &lowerpath, &stat); |
e9be9d5e MS |
564 | |
565 | dput(parent); | |
566 | dput(next); | |
567 | } | |
8eac98b8 | 568 | revert_creds(old_cred); |
e9be9d5e MS |
569 | |
570 | return err; | |
571 | } | |
9aba6521 AG |
572 | |
573 | int ovl_copy_up(struct dentry *dentry) | |
574 | { | |
575 | return ovl_copy_up_flags(dentry, 0); | |
576 | } |