Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0-only
2 : /*
3 : *
4 : * Copyright (C) 2011 Novell Inc.
5 : */
6 :
7 : #include <linux/fs.h>
8 : #include <linux/namei.h>
9 : #include <linux/xattr.h>
10 : #include <linux/security.h>
11 : #include <linux/cred.h>
12 : #include <linux/module.h>
13 : #include <linux/posix_acl.h>
14 : #include <linux/posix_acl_xattr.h>
15 : #include <linux/atomic.h>
16 : #include <linux/ratelimit.h>
17 : #include "overlayfs.h"
18 :
19 : static unsigned short ovl_redirect_max = 256;
20 : module_param_named(redirect_max, ovl_redirect_max, ushort, 0644);
21 : MODULE_PARM_DESC(redirect_max,
22 : "Maximum length of absolute redirect xattr value");
23 :
24 : static int ovl_set_redirect(struct dentry *dentry, bool samedir);
25 :
26 4 : int ovl_cleanup(struct inode *wdir, struct dentry *wdentry)
27 : {
28 4 : int err;
29 :
30 4 : dget(wdentry);
31 8 : if (d_is_dir(wdentry))
32 0 : err = ovl_do_rmdir(wdir, wdentry);
33 : else
34 4 : err = ovl_do_unlink(wdir, wdentry);
35 4 : dput(wdentry);
36 :
37 4 : if (err) {
38 0 : pr_err("cleanup of '%pd2' failed (%i)\n",
39 : wdentry, err);
40 : }
41 :
42 4 : return err;
43 : }
44 :
45 5 : struct dentry *ovl_lookup_temp(struct dentry *workdir)
46 : {
47 5 : struct dentry *temp;
48 5 : char name[20];
49 5 : static atomic_t temp_id = ATOMIC_INIT(0);
50 :
51 : /* counter is allowed to wrap, since temp dentries are ephemeral */
52 5 : snprintf(name, sizeof(name), "#%x", atomic_inc_return(&temp_id));
53 :
54 5 : temp = lookup_one_len(name, workdir, strlen(name));
55 5 : if (!IS_ERR(temp) && temp->d_inode) {
56 0 : pr_err("workdir/%s already exists\n", name);
57 0 : dput(temp);
58 0 : temp = ERR_PTR(-EIO);
59 : }
60 :
61 5 : return temp;
62 : }
63 :
64 : /* caller holds i_mutex on workdir */
65 0 : static struct dentry *ovl_whiteout(struct ovl_fs *ofs)
66 : {
67 0 : int err;
68 0 : struct dentry *whiteout;
69 0 : struct dentry *workdir = ofs->workdir;
70 0 : struct inode *wdir = workdir->d_inode;
71 :
72 0 : if (!ofs->whiteout) {
73 0 : whiteout = ovl_lookup_temp(workdir);
74 0 : if (IS_ERR(whiteout))
75 0 : goto out;
76 :
77 0 : err = ovl_do_whiteout(wdir, whiteout);
78 0 : if (err) {
79 0 : dput(whiteout);
80 0 : whiteout = ERR_PTR(err);
81 0 : goto out;
82 : }
83 0 : ofs->whiteout = whiteout;
84 : }
85 :
86 0 : if (ofs->share_whiteout) {
87 0 : whiteout = ovl_lookup_temp(workdir);
88 0 : if (IS_ERR(whiteout))
89 0 : goto out;
90 :
91 0 : err = ovl_do_link(ofs->whiteout, wdir, whiteout);
92 0 : if (!err)
93 0 : goto out;
94 :
95 0 : if (err != -EMLINK) {
96 0 : pr_warn("Failed to link whiteout - disabling whiteout inode sharing(nlink=%u, err=%i)\n",
97 : ofs->whiteout->d_inode->i_nlink, err);
98 0 : ofs->share_whiteout = false;
99 : }
100 0 : dput(whiteout);
101 : }
102 0 : whiteout = ofs->whiteout;
103 0 : ofs->whiteout = NULL;
104 0 : out:
105 0 : return whiteout;
106 : }
107 :
108 : /* Caller must hold i_mutex on both workdir and dir */
109 0 : int ovl_cleanup_and_whiteout(struct ovl_fs *ofs, struct inode *dir,
110 : struct dentry *dentry)
111 : {
112 0 : struct inode *wdir = ofs->workdir->d_inode;
113 0 : struct dentry *whiteout;
114 0 : int err;
115 0 : int flags = 0;
116 :
117 0 : whiteout = ovl_whiteout(ofs);
118 0 : err = PTR_ERR(whiteout);
119 0 : if (IS_ERR(whiteout))
120 : return err;
121 :
122 0 : if (d_is_dir(dentry))
123 0 : flags = RENAME_EXCHANGE;
124 :
125 0 : err = ovl_do_rename(wdir, whiteout, dir, dentry, flags);
126 0 : if (err)
127 0 : goto kill_whiteout;
128 0 : if (flags)
129 0 : ovl_cleanup(wdir, dentry);
130 :
131 0 : out:
132 0 : dput(whiteout);
133 0 : return err;
134 :
135 0 : kill_whiteout:
136 0 : ovl_cleanup(wdir, whiteout);
137 0 : goto out;
138 : }
139 :
140 3 : static int ovl_mkdir_real(struct inode *dir, struct dentry **newdentry,
141 : umode_t mode)
142 : {
143 3 : int err;
144 3 : struct dentry *d, *dentry = *newdentry;
145 :
146 3 : err = ovl_do_mkdir(dir, dentry, mode);
147 3 : if (err)
148 : return err;
149 :
150 3 : if (likely(!d_unhashed(dentry)))
151 : return 0;
152 :
153 : /*
154 : * vfs_mkdir() may succeed and leave the dentry passed
155 : * to it unhashed and negative. If that happens, try to
156 : * lookup a new hashed and positive dentry.
157 : */
158 0 : d = lookup_one_len(dentry->d_name.name, dentry->d_parent,
159 0 : dentry->d_name.len);
160 0 : if (IS_ERR(d)) {
161 0 : pr_warn("failed lookup after mkdir (%pd2, err=%i).\n",
162 : dentry, err);
163 0 : return PTR_ERR(d);
164 : }
165 0 : dput(dentry);
166 0 : *newdentry = d;
167 :
168 0 : return 0;
169 : }
170 :
171 5 : struct dentry *ovl_create_real(struct inode *dir, struct dentry *newdentry,
172 : struct ovl_cattr *attr)
173 : {
174 5 : int err;
175 :
176 5 : if (IS_ERR(newdentry))
177 : return newdentry;
178 :
179 5 : err = -ESTALE;
180 5 : if (newdentry->d_inode)
181 0 : goto out;
182 :
183 5 : if (attr->hardlink) {
184 0 : err = ovl_do_link(attr->hardlink, dir, newdentry);
185 : } else {
186 5 : switch (attr->mode & S_IFMT) {
187 2 : case S_IFREG:
188 2 : err = ovl_do_create(dir, newdentry, attr->mode);
189 2 : break;
190 :
191 3 : case S_IFDIR:
192 : /* mkdir is special... */
193 3 : err = ovl_mkdir_real(dir, &newdentry, attr->mode);
194 3 : break;
195 :
196 0 : case S_IFCHR:
197 : case S_IFBLK:
198 : case S_IFIFO:
199 : case S_IFSOCK:
200 0 : err = ovl_do_mknod(dir, newdentry, attr->mode,
201 : attr->rdev);
202 0 : break;
203 :
204 0 : case S_IFLNK:
205 0 : err = ovl_do_symlink(dir, newdentry, attr->link);
206 0 : break;
207 :
208 : default:
209 : err = -EPERM;
210 : }
211 : }
212 5 : if (!err && WARN_ON(!newdentry->d_inode)) {
213 : /*
214 : * Not quite sure if non-instantiated dentry is legal or not.
215 : * VFS doesn't seem to care so check and warn here.
216 : */
217 : err = -EIO;
218 : }
219 5 : out:
220 5 : if (err) {
221 0 : dput(newdentry);
222 0 : return ERR_PTR(err);
223 : }
224 5 : return newdentry;
225 : }
226 :
227 3 : struct dentry *ovl_create_temp(struct dentry *workdir, struct ovl_cattr *attr)
228 : {
229 3 : return ovl_create_real(d_inode(workdir), ovl_lookup_temp(workdir),
230 : attr);
231 : }
232 :
233 0 : static int ovl_set_opaque_xerr(struct dentry *dentry, struct dentry *upper,
234 : int xerr)
235 : {
236 0 : int err;
237 :
238 0 : err = ovl_check_setxattr(dentry, upper, OVL_XATTR_OPAQUE, "y", 1, xerr);
239 0 : if (!err)
240 0 : ovl_dentry_set_opaque(dentry);
241 :
242 0 : return err;
243 : }
244 :
245 0 : static int ovl_set_opaque(struct dentry *dentry, struct dentry *upperdentry)
246 : {
247 : /*
248 : * Fail with -EIO when trying to create opaque dir and upper doesn't
249 : * support xattrs. ovl_rename() calls ovl_set_opaque_xerr(-EXDEV) to
250 : * return a specific error for noxattr case.
251 : */
252 0 : return ovl_set_opaque_xerr(dentry, upperdentry, -EIO);
253 : }
254 :
255 : /*
256 : * Common operations required to be done after creation of file on upper.
257 : * If @hardlink is false, then @inode is a pre-allocated inode, we may or
258 : * may not use to instantiate the new dentry.
259 : */
260 0 : static int ovl_instantiate(struct dentry *dentry, struct inode *inode,
261 : struct dentry *newdentry, bool hardlink)
262 : {
263 0 : struct ovl_inode_params oip = {
264 : .upperdentry = newdentry,
265 : .newinode = inode,
266 : };
267 :
268 0 : ovl_dir_modified(dentry->d_parent, false);
269 0 : ovl_dentry_set_upper_alias(dentry);
270 0 : ovl_dentry_update_reval(dentry, newdentry,
271 : DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE);
272 :
273 0 : if (!hardlink) {
274 : /*
275 : * ovl_obtain_alias() can be called after ovl_create_real()
276 : * and before we get here, so we may get an inode from cache
277 : * with the same real upperdentry that is not the inode we
278 : * pre-allocated. In this case we will use the cached inode
279 : * to instantiate the new dentry.
280 : *
281 : * XXX: if we ever use ovl_obtain_alias() to decode directory
282 : * file handles, need to use ovl_get_inode_locked() and
283 : * d_instantiate_new() here to prevent from creating two
284 : * hashed directory inode aliases.
285 : */
286 0 : inode = ovl_get_inode(dentry->d_sb, &oip);
287 0 : if (IS_ERR(inode))
288 0 : return PTR_ERR(inode);
289 0 : if (inode == oip.newinode)
290 0 : ovl_set_flag(OVL_UPPERDATA, inode);
291 : } else {
292 0 : WARN_ON(ovl_inode_real(inode) != d_inode(newdentry));
293 0 : dput(newdentry);
294 0 : inc_nlink(inode);
295 : }
296 :
297 0 : d_instantiate(dentry, inode);
298 0 : if (inode != oip.newinode) {
299 0 : pr_warn_ratelimited("newly created inode found in cache (%pd2)\n",
300 : dentry);
301 : }
302 :
303 : /* Force lookup of new upper hardlink to find its lower */
304 0 : if (hardlink)
305 0 : d_drop(dentry);
306 :
307 : return 0;
308 : }
309 :
310 0 : static bool ovl_type_merge(struct dentry *dentry)
311 : {
312 0 : return OVL_TYPE_MERGE(ovl_path_type(dentry));
313 : }
314 :
315 0 : static bool ovl_type_origin(struct dentry *dentry)
316 : {
317 0 : return OVL_TYPE_ORIGIN(ovl_path_type(dentry));
318 : }
319 :
320 0 : static int ovl_create_upper(struct dentry *dentry, struct inode *inode,
321 : struct ovl_cattr *attr)
322 : {
323 0 : struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
324 0 : struct inode *udir = upperdir->d_inode;
325 0 : struct dentry *newdentry;
326 0 : int err;
327 :
328 0 : if (!attr->hardlink && !IS_POSIXACL(udir))
329 0 : attr->mode &= ~current_umask();
330 :
331 0 : inode_lock_nested(udir, I_MUTEX_PARENT);
332 0 : newdentry = ovl_create_real(udir,
333 0 : lookup_one_len(dentry->d_name.name,
334 : upperdir,
335 0 : dentry->d_name.len),
336 : attr);
337 0 : err = PTR_ERR(newdentry);
338 0 : if (IS_ERR(newdentry))
339 0 : goto out_unlock;
340 :
341 0 : if (ovl_type_merge(dentry->d_parent) && d_is_dir(newdentry)) {
342 : /* Setting opaque here is just an optimization, allow to fail */
343 0 : ovl_set_opaque(dentry, newdentry);
344 : }
345 :
346 0 : err = ovl_instantiate(dentry, inode, newdentry, !!attr->hardlink);
347 0 : if (err)
348 0 : goto out_cleanup;
349 0 : out_unlock:
350 0 : inode_unlock(udir);
351 0 : return err;
352 :
353 0 : out_cleanup:
354 0 : ovl_cleanup(udir, newdentry);
355 0 : dput(newdentry);
356 0 : goto out_unlock;
357 : }
358 :
359 0 : static struct dentry *ovl_clear_empty(struct dentry *dentry,
360 : struct list_head *list)
361 : {
362 0 : struct dentry *workdir = ovl_workdir(dentry);
363 0 : struct inode *wdir = workdir->d_inode;
364 0 : struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
365 0 : struct inode *udir = upperdir->d_inode;
366 0 : struct path upperpath;
367 0 : struct dentry *upper;
368 0 : struct dentry *opaquedir;
369 0 : struct kstat stat;
370 0 : int err;
371 :
372 0 : if (WARN_ON(!workdir))
373 0 : return ERR_PTR(-EROFS);
374 :
375 0 : err = ovl_lock_rename_workdir(workdir, upperdir);
376 0 : if (err)
377 0 : goto out;
378 :
379 0 : ovl_path_upper(dentry, &upperpath);
380 0 : err = vfs_getattr(&upperpath, &stat,
381 : STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
382 0 : if (err)
383 0 : goto out_unlock;
384 :
385 0 : err = -ESTALE;
386 0 : if (!S_ISDIR(stat.mode))
387 0 : goto out_unlock;
388 0 : upper = upperpath.dentry;
389 0 : if (upper->d_parent->d_inode != udir)
390 0 : goto out_unlock;
391 :
392 0 : opaquedir = ovl_create_temp(workdir, OVL_CATTR(stat.mode));
393 0 : err = PTR_ERR(opaquedir);
394 0 : if (IS_ERR(opaquedir))
395 0 : goto out_unlock;
396 :
397 0 : err = ovl_copy_xattr(dentry->d_sb, upper, opaquedir);
398 0 : if (err)
399 0 : goto out_cleanup;
400 :
401 0 : err = ovl_set_opaque(dentry, opaquedir);
402 0 : if (err)
403 0 : goto out_cleanup;
404 :
405 0 : inode_lock(opaquedir->d_inode);
406 0 : err = ovl_set_attr(opaquedir, &stat);
407 0 : inode_unlock(opaquedir->d_inode);
408 0 : if (err)
409 0 : goto out_cleanup;
410 :
411 0 : err = ovl_do_rename(wdir, opaquedir, udir, upper, RENAME_EXCHANGE);
412 0 : if (err)
413 0 : goto out_cleanup;
414 :
415 0 : ovl_cleanup_whiteouts(upper, list);
416 0 : ovl_cleanup(wdir, upper);
417 0 : unlock_rename(workdir, upperdir);
418 :
419 : /* dentry's upper doesn't match now, get rid of it */
420 0 : d_drop(dentry);
421 :
422 0 : return opaquedir;
423 :
424 0 : out_cleanup:
425 0 : ovl_cleanup(wdir, opaquedir);
426 0 : dput(opaquedir);
427 0 : out_unlock:
428 0 : unlock_rename(workdir, upperdir);
429 0 : out:
430 0 : return ERR_PTR(err);
431 : }
432 :
433 : static int ovl_set_upper_acl(struct dentry *upperdentry, const char *name,
434 : const struct posix_acl *acl)
435 : {
436 : void *buffer;
437 : size_t size;
438 : int err;
439 :
440 : if (!IS_ENABLED(CONFIG_FS_POSIX_ACL) || !acl)
441 : return 0;
442 :
443 : size = posix_acl_xattr_size(acl->a_count);
444 : buffer = kmalloc(size, GFP_KERNEL);
445 : if (!buffer)
446 : return -ENOMEM;
447 :
448 : err = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
449 : if (err < 0)
450 : goto out_free;
451 :
452 : err = vfs_setxattr(&init_user_ns, upperdentry, name, buffer, size, XATTR_CREATE);
453 : out_free:
454 : kfree(buffer);
455 : return err;
456 : }
457 :
458 0 : static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode,
459 : struct ovl_cattr *cattr)
460 : {
461 0 : struct dentry *workdir = ovl_workdir(dentry);
462 0 : struct inode *wdir = workdir->d_inode;
463 0 : struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
464 0 : struct inode *udir = upperdir->d_inode;
465 0 : struct dentry *upper;
466 0 : struct dentry *newdentry;
467 0 : int err;
468 0 : struct posix_acl *acl, *default_acl;
469 0 : bool hardlink = !!cattr->hardlink;
470 :
471 0 : if (WARN_ON(!workdir))
472 : return -EROFS;
473 :
474 0 : if (!hardlink) {
475 : err = posix_acl_create(dentry->d_parent->d_inode,
476 : &cattr->mode, &default_acl, &acl);
477 : if (err)
478 : return err;
479 : }
480 :
481 0 : err = ovl_lock_rename_workdir(workdir, upperdir);
482 0 : if (err)
483 0 : goto out;
484 :
485 0 : upper = lookup_one_len(dentry->d_name.name, upperdir,
486 0 : dentry->d_name.len);
487 0 : err = PTR_ERR(upper);
488 0 : if (IS_ERR(upper))
489 0 : goto out_unlock;
490 :
491 0 : err = -ESTALE;
492 0 : if (d_is_negative(upper) || !IS_WHITEOUT(d_inode(upper)))
493 0 : goto out_dput;
494 :
495 0 : newdentry = ovl_create_temp(workdir, cattr);
496 0 : err = PTR_ERR(newdentry);
497 0 : if (IS_ERR(newdentry))
498 0 : goto out_dput;
499 :
500 : /*
501 : * mode could have been mutilated due to umask (e.g. sgid directory)
502 : */
503 0 : if (!hardlink &&
504 0 : !S_ISLNK(cattr->mode) &&
505 0 : newdentry->d_inode->i_mode != cattr->mode) {
506 0 : struct iattr attr = {
507 : .ia_valid = ATTR_MODE,
508 : .ia_mode = cattr->mode,
509 : };
510 0 : inode_lock(newdentry->d_inode);
511 0 : err = notify_change(&init_user_ns, newdentry, &attr, NULL);
512 0 : inode_unlock(newdentry->d_inode);
513 0 : if (err)
514 0 : goto out_cleanup;
515 : }
516 0 : if (!hardlink) {
517 0 : err = ovl_set_upper_acl(newdentry, XATTR_NAME_POSIX_ACL_ACCESS,
518 : acl);
519 : if (err)
520 : goto out_cleanup;
521 :
522 0 : err = ovl_set_upper_acl(newdentry, XATTR_NAME_POSIX_ACL_DEFAULT,
523 : default_acl);
524 : if (err)
525 : goto out_cleanup;
526 : }
527 :
528 0 : if (!hardlink && S_ISDIR(cattr->mode)) {
529 0 : err = ovl_set_opaque(dentry, newdentry);
530 0 : if (err)
531 0 : goto out_cleanup;
532 :
533 0 : err = ovl_do_rename(wdir, newdentry, udir, upper,
534 : RENAME_EXCHANGE);
535 0 : if (err)
536 0 : goto out_cleanup;
537 :
538 0 : ovl_cleanup(wdir, upper);
539 : } else {
540 0 : err = ovl_do_rename(wdir, newdentry, udir, upper, 0);
541 0 : if (err)
542 0 : goto out_cleanup;
543 : }
544 0 : err = ovl_instantiate(dentry, inode, newdentry, hardlink);
545 0 : if (err)
546 0 : goto out_cleanup;
547 0 : out_dput:
548 0 : dput(upper);
549 0 : out_unlock:
550 0 : unlock_rename(workdir, upperdir);
551 0 : out:
552 0 : if (!hardlink) {
553 0 : posix_acl_release(acl);
554 0 : posix_acl_release(default_acl);
555 : }
556 : return err;
557 :
558 0 : out_cleanup:
559 0 : ovl_cleanup(wdir, newdentry);
560 0 : dput(newdentry);
561 0 : goto out_dput;
562 : }
563 :
564 0 : static int ovl_create_or_link(struct dentry *dentry, struct inode *inode,
565 : struct ovl_cattr *attr, bool origin)
566 : {
567 0 : int err;
568 0 : const struct cred *old_cred;
569 0 : struct cred *override_cred;
570 0 : struct dentry *parent = dentry->d_parent;
571 :
572 0 : err = ovl_copy_up(parent);
573 0 : if (err)
574 : return err;
575 :
576 0 : old_cred = ovl_override_creds(dentry->d_sb);
577 :
578 : /*
579 : * When linking a file with copy up origin into a new parent, mark the
580 : * new parent dir "impure".
581 : */
582 0 : if (origin) {
583 0 : err = ovl_set_impure(parent, ovl_dentry_upper(parent));
584 0 : if (err)
585 0 : goto out_revert_creds;
586 : }
587 :
588 0 : err = -ENOMEM;
589 0 : override_cred = prepare_creds();
590 0 : if (override_cred) {
591 0 : override_cred->fsuid = inode->i_uid;
592 0 : override_cred->fsgid = inode->i_gid;
593 0 : if (!attr->hardlink) {
594 0 : err = security_dentry_create_files_as(dentry,
595 0 : attr->mode, &dentry->d_name, old_cred,
596 : override_cred);
597 0 : if (err) {
598 0 : put_cred(override_cred);
599 0 : goto out_revert_creds;
600 : }
601 : }
602 0 : put_cred(override_creds(override_cred));
603 0 : put_cred(override_cred);
604 :
605 0 : if (!ovl_dentry_is_whiteout(dentry))
606 0 : err = ovl_create_upper(dentry, inode, attr);
607 : else
608 0 : err = ovl_create_over_whiteout(dentry, inode, attr);
609 : }
610 0 : out_revert_creds:
611 0 : revert_creds(old_cred);
612 0 : return err;
613 : }
614 :
615 0 : static int ovl_create_object(struct dentry *dentry, int mode, dev_t rdev,
616 : const char *link)
617 : {
618 0 : int err;
619 0 : struct inode *inode;
620 0 : struct ovl_cattr attr = {
621 : .rdev = rdev,
622 : .link = link,
623 : };
624 :
625 0 : err = ovl_want_write(dentry);
626 0 : if (err)
627 0 : goto out;
628 :
629 : /* Preallocate inode to be used by ovl_get_inode() */
630 0 : err = -ENOMEM;
631 0 : inode = ovl_new_inode(dentry->d_sb, mode, rdev);
632 0 : if (!inode)
633 0 : goto out_drop_write;
634 :
635 0 : spin_lock(&inode->i_lock);
636 0 : inode->i_state |= I_CREATING;
637 0 : spin_unlock(&inode->i_lock);
638 :
639 0 : inode_init_owner(&init_user_ns, inode, dentry->d_parent->d_inode, mode);
640 0 : attr.mode = inode->i_mode;
641 :
642 0 : err = ovl_create_or_link(dentry, inode, &attr, false);
643 : /* Did we end up using the preallocated inode? */
644 0 : if (inode != d_inode(dentry))
645 0 : iput(inode);
646 :
647 0 : out_drop_write:
648 0 : ovl_drop_write(dentry);
649 0 : out:
650 0 : return err;
651 : }
652 :
653 0 : static int ovl_create(struct user_namespace *mnt_userns, struct inode *dir,
654 : struct dentry *dentry, umode_t mode, bool excl)
655 : {
656 0 : return ovl_create_object(dentry, (mode & 07777) | S_IFREG, 0, NULL);
657 : }
658 :
659 0 : static int ovl_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
660 : struct dentry *dentry, umode_t mode)
661 : {
662 0 : return ovl_create_object(dentry, (mode & 07777) | S_IFDIR, 0, NULL);
663 : }
664 :
665 0 : static int ovl_mknod(struct user_namespace *mnt_userns, struct inode *dir,
666 : struct dentry *dentry, umode_t mode, dev_t rdev)
667 : {
668 : /* Don't allow creation of "whiteout" on overlay */
669 0 : if (S_ISCHR(mode) && rdev == WHITEOUT_DEV)
670 : return -EPERM;
671 :
672 0 : return ovl_create_object(dentry, mode, rdev, NULL);
673 : }
674 :
675 0 : static int ovl_symlink(struct user_namespace *mnt_userns, struct inode *dir,
676 : struct dentry *dentry, const char *link)
677 : {
678 0 : return ovl_create_object(dentry, S_IFLNK, 0, link);
679 : }
680 :
681 0 : static int ovl_set_link_redirect(struct dentry *dentry)
682 : {
683 0 : const struct cred *old_cred;
684 0 : int err;
685 :
686 0 : old_cred = ovl_override_creds(dentry->d_sb);
687 0 : err = ovl_set_redirect(dentry, false);
688 0 : revert_creds(old_cred);
689 :
690 0 : return err;
691 : }
692 :
693 0 : static int ovl_link(struct dentry *old, struct inode *newdir,
694 : struct dentry *new)
695 : {
696 0 : int err;
697 0 : struct inode *inode;
698 :
699 0 : err = ovl_want_write(old);
700 0 : if (err)
701 0 : goto out;
702 :
703 0 : err = ovl_copy_up(old);
704 0 : if (err)
705 0 : goto out_drop_write;
706 :
707 0 : err = ovl_copy_up(new->d_parent);
708 0 : if (err)
709 0 : goto out_drop_write;
710 :
711 0 : if (ovl_is_metacopy_dentry(old)) {
712 0 : err = ovl_set_link_redirect(old);
713 0 : if (err)
714 0 : goto out_drop_write;
715 : }
716 :
717 0 : err = ovl_nlink_start(old);
718 0 : if (err)
719 0 : goto out_drop_write;
720 :
721 0 : inode = d_inode(old);
722 0 : ihold(inode);
723 :
724 0 : err = ovl_create_or_link(new, inode,
725 0 : &(struct ovl_cattr) {.hardlink = ovl_dentry_upper(old)},
726 0 : ovl_type_origin(old));
727 0 : if (err)
728 0 : iput(inode);
729 :
730 0 : ovl_nlink_end(old);
731 0 : out_drop_write:
732 0 : ovl_drop_write(old);
733 0 : out:
734 0 : return err;
735 : }
736 :
737 0 : static bool ovl_matches_upper(struct dentry *dentry, struct dentry *upper)
738 : {
739 0 : return d_inode(ovl_dentry_upper(dentry)) == d_inode(upper);
740 : }
741 :
742 0 : static int ovl_remove_and_whiteout(struct dentry *dentry,
743 : struct list_head *list)
744 : {
745 0 : struct ovl_fs *ofs = OVL_FS(dentry->d_sb);
746 0 : struct dentry *workdir = ovl_workdir(dentry);
747 0 : struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
748 0 : struct dentry *upper;
749 0 : struct dentry *opaquedir = NULL;
750 0 : int err;
751 :
752 0 : if (WARN_ON(!workdir))
753 : return -EROFS;
754 :
755 0 : if (!list_empty(list)) {
756 0 : opaquedir = ovl_clear_empty(dentry, list);
757 0 : err = PTR_ERR(opaquedir);
758 0 : if (IS_ERR(opaquedir))
759 0 : goto out;
760 : }
761 :
762 0 : err = ovl_lock_rename_workdir(workdir, upperdir);
763 0 : if (err)
764 0 : goto out_dput;
765 :
766 0 : upper = lookup_one_len(dentry->d_name.name, upperdir,
767 0 : dentry->d_name.len);
768 0 : err = PTR_ERR(upper);
769 0 : if (IS_ERR(upper))
770 0 : goto out_unlock;
771 :
772 0 : err = -ESTALE;
773 0 : if ((opaquedir && upper != opaquedir) ||
774 0 : (!opaquedir && ovl_dentry_upper(dentry) &&
775 0 : !ovl_matches_upper(dentry, upper))) {
776 0 : goto out_dput_upper;
777 : }
778 :
779 0 : err = ovl_cleanup_and_whiteout(ofs, d_inode(upperdir), upper);
780 0 : if (err)
781 0 : goto out_d_drop;
782 :
783 0 : ovl_dir_modified(dentry->d_parent, true);
784 0 : out_d_drop:
785 0 : d_drop(dentry);
786 0 : out_dput_upper:
787 0 : dput(upper);
788 0 : out_unlock:
789 0 : unlock_rename(workdir, upperdir);
790 0 : out_dput:
791 0 : dput(opaquedir);
792 : out:
793 : return err;
794 : }
795 :
796 0 : static int ovl_remove_upper(struct dentry *dentry, bool is_dir,
797 : struct list_head *list)
798 : {
799 0 : struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
800 0 : struct inode *dir = upperdir->d_inode;
801 0 : struct dentry *upper;
802 0 : struct dentry *opaquedir = NULL;
803 0 : int err;
804 :
805 0 : if (!list_empty(list)) {
806 0 : opaquedir = ovl_clear_empty(dentry, list);
807 0 : err = PTR_ERR(opaquedir);
808 0 : if (IS_ERR(opaquedir))
809 0 : goto out;
810 : }
811 :
812 0 : inode_lock_nested(dir, I_MUTEX_PARENT);
813 0 : upper = lookup_one_len(dentry->d_name.name, upperdir,
814 0 : dentry->d_name.len);
815 0 : err = PTR_ERR(upper);
816 0 : if (IS_ERR(upper))
817 0 : goto out_unlock;
818 :
819 0 : err = -ESTALE;
820 0 : if ((opaquedir && upper != opaquedir) ||
821 0 : (!opaquedir && !ovl_matches_upper(dentry, upper)))
822 0 : goto out_dput_upper;
823 :
824 0 : if (is_dir)
825 0 : err = vfs_rmdir(&init_user_ns, dir, upper);
826 : else
827 0 : err = vfs_unlink(&init_user_ns, dir, upper, NULL);
828 0 : ovl_dir_modified(dentry->d_parent, ovl_type_origin(dentry));
829 :
830 : /*
831 : * Keeping this dentry hashed would mean having to release
832 : * upperpath/lowerpath, which could only be done if we are the
833 : * sole user of this dentry. Too tricky... Just unhash for
834 : * now.
835 : */
836 0 : if (!err)
837 0 : d_drop(dentry);
838 0 : out_dput_upper:
839 0 : dput(upper);
840 0 : out_unlock:
841 0 : inode_unlock(dir);
842 0 : dput(opaquedir);
843 0 : out:
844 0 : return err;
845 : }
846 :
847 0 : static bool ovl_pure_upper(struct dentry *dentry)
848 : {
849 0 : return !ovl_dentry_lower(dentry) &&
850 0 : !ovl_test_flag(OVL_WHITEOUTS, d_inode(dentry));
851 : }
852 :
853 0 : static void ovl_drop_nlink(struct dentry *dentry)
854 : {
855 0 : struct inode *inode = d_inode(dentry);
856 0 : struct dentry *alias;
857 :
858 : /* Try to find another, hashed alias */
859 0 : spin_lock(&inode->i_lock);
860 0 : hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) {
861 0 : if (alias != dentry && !d_unhashed(alias))
862 : break;
863 : }
864 0 : spin_unlock(&inode->i_lock);
865 :
866 : /*
867 : * Changes to underlying layers may cause i_nlink to lose sync with
868 : * reality. In this case prevent the link count from going to zero
869 : * prematurely.
870 : */
871 0 : if (inode->i_nlink > !!alias)
872 0 : drop_nlink(inode);
873 0 : }
874 :
875 0 : static int ovl_do_remove(struct dentry *dentry, bool is_dir)
876 : {
877 0 : int err;
878 0 : const struct cred *old_cred;
879 0 : struct dentry *upperdentry;
880 0 : bool lower_positive = ovl_lower_positive(dentry);
881 0 : LIST_HEAD(list);
882 :
883 : /* No need to clean pure upper removed by vfs_rmdir() */
884 0 : if (is_dir && (lower_positive || !ovl_pure_upper(dentry))) {
885 0 : err = ovl_check_empty_dir(dentry, &list);
886 0 : if (err)
887 0 : goto out;
888 : }
889 :
890 0 : err = ovl_want_write(dentry);
891 0 : if (err)
892 0 : goto out;
893 :
894 0 : err = ovl_copy_up(dentry->d_parent);
895 0 : if (err)
896 0 : goto out_drop_write;
897 :
898 0 : err = ovl_nlink_start(dentry);
899 0 : if (err)
900 0 : goto out_drop_write;
901 :
902 0 : old_cred = ovl_override_creds(dentry->d_sb);
903 0 : if (!lower_positive)
904 0 : err = ovl_remove_upper(dentry, is_dir, &list);
905 : else
906 0 : err = ovl_remove_and_whiteout(dentry, &list);
907 0 : revert_creds(old_cred);
908 0 : if (!err) {
909 0 : if (is_dir)
910 0 : clear_nlink(dentry->d_inode);
911 : else
912 0 : ovl_drop_nlink(dentry);
913 : }
914 0 : ovl_nlink_end(dentry);
915 :
916 : /*
917 : * Copy ctime
918 : *
919 : * Note: we fail to update ctime if there was no copy-up, only a
920 : * whiteout
921 : */
922 0 : upperdentry = ovl_dentry_upper(dentry);
923 0 : if (upperdentry)
924 0 : ovl_copyattr(d_inode(upperdentry), d_inode(dentry));
925 :
926 0 : out_drop_write:
927 0 : ovl_drop_write(dentry);
928 0 : out:
929 0 : ovl_cache_free(&list);
930 0 : return err;
931 : }
932 :
933 0 : static int ovl_unlink(struct inode *dir, struct dentry *dentry)
934 : {
935 0 : return ovl_do_remove(dentry, false);
936 : }
937 :
938 0 : static int ovl_rmdir(struct inode *dir, struct dentry *dentry)
939 : {
940 0 : return ovl_do_remove(dentry, true);
941 : }
942 :
943 0 : static bool ovl_type_merge_or_lower(struct dentry *dentry)
944 : {
945 0 : enum ovl_path_type type = ovl_path_type(dentry);
946 :
947 0 : return OVL_TYPE_MERGE(type) || !OVL_TYPE_UPPER(type);
948 : }
949 :
950 0 : static bool ovl_can_move(struct dentry *dentry)
951 : {
952 0 : return ovl_redirect_dir(dentry->d_sb) ||
953 0 : !d_is_dir(dentry) || !ovl_type_merge_or_lower(dentry);
954 : }
955 :
956 0 : static char *ovl_get_redirect(struct dentry *dentry, bool abs_redirect)
957 : {
958 0 : char *buf, *ret;
959 0 : struct dentry *d, *tmp;
960 0 : int buflen = ovl_redirect_max + 1;
961 :
962 0 : if (!abs_redirect) {
963 0 : ret = kstrndup(dentry->d_name.name, dentry->d_name.len,
964 : GFP_KERNEL);
965 0 : goto out;
966 : }
967 :
968 0 : buf = ret = kmalloc(buflen, GFP_KERNEL);
969 0 : if (!buf)
970 0 : goto out;
971 :
972 0 : buflen--;
973 0 : buf[buflen] = '\0';
974 0 : for (d = dget(dentry); !IS_ROOT(d);) {
975 0 : const char *name;
976 0 : int thislen;
977 :
978 0 : spin_lock(&d->d_lock);
979 0 : name = ovl_dentry_get_redirect(d);
980 0 : if (name) {
981 0 : thislen = strlen(name);
982 : } else {
983 0 : name = d->d_name.name;
984 0 : thislen = d->d_name.len;
985 : }
986 :
987 : /* If path is too long, fall back to userspace move */
988 0 : if (thislen + (name[0] != '/') > buflen) {
989 0 : ret = ERR_PTR(-EXDEV);
990 0 : spin_unlock(&d->d_lock);
991 0 : goto out_put;
992 : }
993 :
994 0 : buflen -= thislen;
995 0 : memcpy(&buf[buflen], name, thislen);
996 0 : spin_unlock(&d->d_lock);
997 0 : tmp = dget_parent(d);
998 :
999 0 : dput(d);
1000 0 : d = tmp;
1001 :
1002 : /* Absolute redirect: finished */
1003 0 : if (buf[buflen] == '/')
1004 : break;
1005 0 : buflen--;
1006 0 : buf[buflen] = '/';
1007 : }
1008 0 : ret = kstrdup(&buf[buflen], GFP_KERNEL);
1009 0 : out_put:
1010 0 : dput(d);
1011 0 : kfree(buf);
1012 0 : out:
1013 0 : return ret ? ret : ERR_PTR(-ENOMEM);
1014 : }
1015 :
1016 0 : static bool ovl_need_absolute_redirect(struct dentry *dentry, bool samedir)
1017 : {
1018 0 : struct dentry *lowerdentry;
1019 :
1020 0 : if (!samedir)
1021 : return true;
1022 :
1023 0 : if (d_is_dir(dentry))
1024 : return false;
1025 :
1026 : /*
1027 : * For non-dir hardlinked files, we need absolute redirects
1028 : * in general as two upper hardlinks could be in different
1029 : * dirs. We could put a relative redirect now and convert
1030 : * it to absolute redirect later. But when nlink > 1 and
1031 : * indexing is on, that means relative redirect needs to be
1032 : * converted to absolute during copy up of another lower
1033 : * hardllink as well.
1034 : *
1035 : * So without optimizing too much, just check if lower is
1036 : * a hard link or not. If lower is hard link, put absolute
1037 : * redirect.
1038 : */
1039 0 : lowerdentry = ovl_dentry_lower(dentry);
1040 0 : return (d_inode(lowerdentry)->i_nlink > 1);
1041 : }
1042 :
1043 0 : static int ovl_set_redirect(struct dentry *dentry, bool samedir)
1044 : {
1045 0 : int err;
1046 0 : const char *redirect = ovl_dentry_get_redirect(dentry);
1047 0 : bool absolute_redirect = ovl_need_absolute_redirect(dentry, samedir);
1048 :
1049 0 : if (redirect && (!absolute_redirect || redirect[0] == '/'))
1050 : return 0;
1051 :
1052 0 : redirect = ovl_get_redirect(dentry, absolute_redirect);
1053 0 : if (IS_ERR(redirect))
1054 0 : return PTR_ERR(redirect);
1055 :
1056 0 : err = ovl_check_setxattr(dentry, ovl_dentry_upper(dentry),
1057 : OVL_XATTR_REDIRECT,
1058 : redirect, strlen(redirect), -EXDEV);
1059 0 : if (!err) {
1060 0 : spin_lock(&dentry->d_lock);
1061 0 : ovl_dentry_set_redirect(dentry, redirect);
1062 0 : spin_unlock(&dentry->d_lock);
1063 : } else {
1064 0 : kfree(redirect);
1065 0 : pr_warn_ratelimited("failed to set redirect (%i)\n",
1066 : err);
1067 : /* Fall back to userspace copy-up */
1068 : err = -EXDEV;
1069 : }
1070 : return err;
1071 : }
1072 :
1073 0 : static int ovl_rename(struct user_namespace *mnt_userns, struct inode *olddir,
1074 : struct dentry *old, struct inode *newdir,
1075 : struct dentry *new, unsigned int flags)
1076 : {
1077 0 : int err;
1078 0 : struct dentry *old_upperdir;
1079 0 : struct dentry *new_upperdir;
1080 0 : struct dentry *olddentry;
1081 0 : struct dentry *newdentry;
1082 0 : struct dentry *trap;
1083 0 : bool old_opaque;
1084 0 : bool new_opaque;
1085 0 : bool cleanup_whiteout = false;
1086 0 : bool update_nlink = false;
1087 0 : bool overwrite = !(flags & RENAME_EXCHANGE);
1088 0 : bool is_dir = d_is_dir(old);
1089 0 : bool new_is_dir = d_is_dir(new);
1090 0 : bool samedir = olddir == newdir;
1091 0 : struct dentry *opaquedir = NULL;
1092 0 : const struct cred *old_cred = NULL;
1093 0 : LIST_HEAD(list);
1094 :
1095 0 : err = -EINVAL;
1096 0 : if (flags & ~(RENAME_EXCHANGE | RENAME_NOREPLACE))
1097 0 : goto out;
1098 :
1099 0 : flags &= ~RENAME_NOREPLACE;
1100 :
1101 : /* Don't copy up directory trees */
1102 0 : err = -EXDEV;
1103 0 : if (!ovl_can_move(old))
1104 0 : goto out;
1105 0 : if (!overwrite && !ovl_can_move(new))
1106 0 : goto out;
1107 :
1108 0 : if (overwrite && new_is_dir && !ovl_pure_upper(new)) {
1109 0 : err = ovl_check_empty_dir(new, &list);
1110 0 : if (err)
1111 0 : goto out;
1112 : }
1113 :
1114 0 : if (overwrite) {
1115 0 : if (ovl_lower_positive(old)) {
1116 0 : if (!ovl_dentry_is_whiteout(new)) {
1117 : /* Whiteout source */
1118 0 : flags |= RENAME_WHITEOUT;
1119 : } else {
1120 : /* Switch whiteouts */
1121 0 : flags |= RENAME_EXCHANGE;
1122 : }
1123 0 : } else if (is_dir && ovl_dentry_is_whiteout(new)) {
1124 0 : flags |= RENAME_EXCHANGE;
1125 0 : cleanup_whiteout = true;
1126 : }
1127 : }
1128 :
1129 0 : err = ovl_want_write(old);
1130 0 : if (err)
1131 0 : goto out;
1132 :
1133 0 : err = ovl_copy_up(old);
1134 0 : if (err)
1135 0 : goto out_drop_write;
1136 :
1137 0 : err = ovl_copy_up(new->d_parent);
1138 0 : if (err)
1139 0 : goto out_drop_write;
1140 0 : if (!overwrite) {
1141 0 : err = ovl_copy_up(new);
1142 0 : if (err)
1143 0 : goto out_drop_write;
1144 0 : } else if (d_inode(new)) {
1145 0 : err = ovl_nlink_start(new);
1146 0 : if (err)
1147 0 : goto out_drop_write;
1148 :
1149 : update_nlink = true;
1150 : }
1151 :
1152 0 : old_cred = ovl_override_creds(old->d_sb);
1153 :
1154 0 : if (!list_empty(&list)) {
1155 0 : opaquedir = ovl_clear_empty(new, &list);
1156 0 : err = PTR_ERR(opaquedir);
1157 0 : if (IS_ERR(opaquedir)) {
1158 0 : opaquedir = NULL;
1159 0 : goto out_revert_creds;
1160 : }
1161 : }
1162 :
1163 0 : old_upperdir = ovl_dentry_upper(old->d_parent);
1164 0 : new_upperdir = ovl_dentry_upper(new->d_parent);
1165 :
1166 0 : if (!samedir) {
1167 : /*
1168 : * When moving a merge dir or non-dir with copy up origin into
1169 : * a new parent, we are marking the new parent dir "impure".
1170 : * When ovl_iterate() iterates an "impure" upper dir, it will
1171 : * lookup the origin inodes of the entries to fill d_ino.
1172 : */
1173 0 : if (ovl_type_origin(old)) {
1174 0 : err = ovl_set_impure(new->d_parent, new_upperdir);
1175 0 : if (err)
1176 0 : goto out_revert_creds;
1177 : }
1178 0 : if (!overwrite && ovl_type_origin(new)) {
1179 0 : err = ovl_set_impure(old->d_parent, old_upperdir);
1180 0 : if (err)
1181 0 : goto out_revert_creds;
1182 : }
1183 : }
1184 :
1185 0 : trap = lock_rename(new_upperdir, old_upperdir);
1186 :
1187 0 : olddentry = lookup_one_len(old->d_name.name, old_upperdir,
1188 0 : old->d_name.len);
1189 0 : err = PTR_ERR(olddentry);
1190 0 : if (IS_ERR(olddentry))
1191 0 : goto out_unlock;
1192 :
1193 0 : err = -ESTALE;
1194 0 : if (!ovl_matches_upper(old, olddentry))
1195 0 : goto out_dput_old;
1196 :
1197 0 : newdentry = lookup_one_len(new->d_name.name, new_upperdir,
1198 0 : new->d_name.len);
1199 0 : err = PTR_ERR(newdentry);
1200 0 : if (IS_ERR(newdentry))
1201 0 : goto out_dput_old;
1202 :
1203 0 : old_opaque = ovl_dentry_is_opaque(old);
1204 0 : new_opaque = ovl_dentry_is_opaque(new);
1205 :
1206 0 : err = -ESTALE;
1207 0 : if (d_inode(new) && ovl_dentry_upper(new)) {
1208 0 : if (opaquedir) {
1209 0 : if (newdentry != opaquedir)
1210 0 : goto out_dput;
1211 : } else {
1212 0 : if (!ovl_matches_upper(new, newdentry))
1213 0 : goto out_dput;
1214 : }
1215 : } else {
1216 0 : if (!d_is_negative(newdentry) &&
1217 0 : (!new_opaque || !ovl_is_whiteout(newdentry)))
1218 0 : goto out_dput;
1219 : }
1220 :
1221 0 : if (olddentry == trap)
1222 0 : goto out_dput;
1223 0 : if (newdentry == trap)
1224 0 : goto out_dput;
1225 :
1226 0 : if (olddentry->d_inode == newdentry->d_inode)
1227 0 : goto out_dput;
1228 :
1229 0 : err = 0;
1230 0 : if (ovl_type_merge_or_lower(old))
1231 0 : err = ovl_set_redirect(old, samedir);
1232 0 : else if (is_dir && !old_opaque && ovl_type_merge(new->d_parent))
1233 0 : err = ovl_set_opaque_xerr(old, olddentry, -EXDEV);
1234 0 : if (err)
1235 0 : goto out_dput;
1236 :
1237 0 : if (!overwrite && ovl_type_merge_or_lower(new))
1238 0 : err = ovl_set_redirect(new, samedir);
1239 0 : else if (!overwrite && new_is_dir && !new_opaque &&
1240 0 : ovl_type_merge(old->d_parent))
1241 0 : err = ovl_set_opaque_xerr(new, newdentry, -EXDEV);
1242 0 : if (err)
1243 0 : goto out_dput;
1244 :
1245 0 : err = ovl_do_rename(old_upperdir->d_inode, olddentry,
1246 : new_upperdir->d_inode, newdentry, flags);
1247 0 : if (err)
1248 0 : goto out_dput;
1249 :
1250 0 : if (cleanup_whiteout)
1251 0 : ovl_cleanup(old_upperdir->d_inode, newdentry);
1252 :
1253 0 : if (overwrite && d_inode(new)) {
1254 0 : if (new_is_dir)
1255 0 : clear_nlink(d_inode(new));
1256 : else
1257 0 : ovl_drop_nlink(new);
1258 : }
1259 :
1260 0 : ovl_dir_modified(old->d_parent, ovl_type_origin(old) ||
1261 0 : (!overwrite && ovl_type_origin(new)));
1262 0 : ovl_dir_modified(new->d_parent, ovl_type_origin(old) ||
1263 0 : (d_inode(new) && ovl_type_origin(new)));
1264 :
1265 : /* copy ctime: */
1266 0 : ovl_copyattr(d_inode(olddentry), d_inode(old));
1267 0 : if (d_inode(new) && ovl_dentry_upper(new))
1268 0 : ovl_copyattr(d_inode(newdentry), d_inode(new));
1269 :
1270 0 : out_dput:
1271 0 : dput(newdentry);
1272 0 : out_dput_old:
1273 0 : dput(olddentry);
1274 0 : out_unlock:
1275 0 : unlock_rename(new_upperdir, old_upperdir);
1276 0 : out_revert_creds:
1277 0 : revert_creds(old_cred);
1278 0 : if (update_nlink)
1279 0 : ovl_nlink_end(new);
1280 0 : out_drop_write:
1281 0 : ovl_drop_write(old);
1282 0 : out:
1283 0 : dput(opaquedir);
1284 0 : ovl_cache_free(&list);
1285 0 : return err;
1286 : }
1287 :
1288 : const struct inode_operations ovl_dir_inode_operations = {
1289 : .lookup = ovl_lookup,
1290 : .mkdir = ovl_mkdir,
1291 : .symlink = ovl_symlink,
1292 : .unlink = ovl_unlink,
1293 : .rmdir = ovl_rmdir,
1294 : .rename = ovl_rename,
1295 : .link = ovl_link,
1296 : .setattr = ovl_setattr,
1297 : .create = ovl_create,
1298 : .mknod = ovl_mknod,
1299 : .permission = ovl_permission,
1300 : .getattr = ovl_getattr,
1301 : .listxattr = ovl_listxattr,
1302 : .get_acl = ovl_get_acl,
1303 : .update_time = ovl_update_time,
1304 : };
|
