1 /* SPDX-License-Identifier: GPL-2.0-only */
4 * Copyright (C) 2011 Novell Inc.
7 #include <linux/kernel.h>
8 #include <linux/uuid.h>
10 #include <linux/namei.h>
11 #include <linux/posix_acl.h>
12 #include <linux/posix_acl_xattr.h>
13 #include "ovl_entry.h"
16 #define pr_fmt(fmt) "overlayfs: " fmt
19 __OVL_PATH_UPPER = (1 << 0),
20 __OVL_PATH_MERGE = (1 << 1),
21 __OVL_PATH_ORIGIN = (1 << 2),
24 #define OVL_TYPE_UPPER(type) ((type) & __OVL_PATH_UPPER)
25 #define OVL_TYPE_MERGE(type) ((type) & __OVL_PATH_MERGE)
26 #define OVL_TYPE_ORIGIN(type) ((type) & __OVL_PATH_ORIGIN)
28 #define OVL_XATTR_NAMESPACE "overlay."
29 #define OVL_XATTR_TRUSTED_PREFIX XATTR_TRUSTED_PREFIX OVL_XATTR_NAMESPACE
30 #define OVL_XATTR_USER_PREFIX XATTR_USER_PREFIX OVL_XATTR_NAMESPACE
44 /* Pure upper dir that may contain non pure upper entries */
46 /* Non-merge dir that may contain whiteout entries */
50 /* Inode number will remain constant over copy up. */
61 OVL_REDIRECT_OFF, /* "off" mode is never used. In effect */
62 OVL_REDIRECT_FOLLOW, /* ...it translates to either "follow" */
63 OVL_REDIRECT_NOFOLLOW, /* ...or "nofollow". */
73 /* The set of options that user requested explicitly via mount options */
82 * The tuple (fh,uuid) is a universal unique identifier for a copy up origin,
84 * origin.fh - exported file handle of the lower file
85 * origin.uuid - uuid of the lower filesystem
87 #define OVL_FH_VERSION 0
88 #define OVL_FH_MAGIC 0xfb
90 /* CPU byte order required for fid decoding: */
91 #define OVL_FH_FLAG_BIG_ENDIAN (1 << 0)
92 #define OVL_FH_FLAG_ANY_ENDIAN (1 << 1)
93 /* Is the real inode encoded in fid an upper inode? */
94 #define OVL_FH_FLAG_PATH_UPPER (1 << 2)
96 #define OVL_FH_FLAG_ALL (OVL_FH_FLAG_BIG_ENDIAN | OVL_FH_FLAG_ANY_ENDIAN | \
97 OVL_FH_FLAG_PATH_UPPER)
99 #if defined(__LITTLE_ENDIAN)
100 #define OVL_FH_FLAG_CPU_ENDIAN 0
101 #elif defined(__BIG_ENDIAN)
102 #define OVL_FH_FLAG_CPU_ENDIAN OVL_FH_FLAG_BIG_ENDIAN
104 #error Endianness not defined
107 /* The type used to be returned by overlay exportfs for misaligned fid */
108 #define OVL_FILEID_V0 0xfb
109 /* The type returned by overlay exportfs for 32bit aligned fid */
110 #define OVL_FILEID_V1 0xf8
112 /* On-disk format for "origin" file handle */
116 u8 len; /* size of this header + size of fid */
117 u8 flags; /* OVL_FH_FLAG_* */
118 u8 type; /* fid_type of fid */
119 uuid_t uuid; /* uuid of filesystem */
120 u32 fid[]; /* file identifier should be 32bit aligned in-memory */
123 /* In-memory and on-wire format for overlay file handle */
125 u8 padding[3]; /* make sure fb.fid is 32bit aligned */
128 DECLARE_FLEX_ARRAY(u8, buf);
132 #define OVL_FH_WIRE_OFFSET offsetof(struct ovl_fh, fb)
133 #define OVL_FH_LEN(fh) (OVL_FH_WIRE_OFFSET + (fh)->fb.len)
134 #define OVL_FH_FID_OFFSET (OVL_FH_WIRE_OFFSET + \
135 offsetof(struct ovl_fb, fid))
137 extern const char *const ovl_xattr_table[][2];
138 static inline const char *ovl_xattr(struct ovl_fs *ofs, enum ovl_xattr ox)
140 return ovl_xattr_table[ox][ofs->config.userxattr];
144 * When changing ownership of an upper object map the intended ownership
145 * according to the upper layer's idmapping. When an upper mount idmaps files
146 * that are stored on-disk as owned by id 1001 to id 1000 this means stat on
147 * this object will report it as being owned by id 1000 when calling stat via
149 * In order to change ownership of an object so stat reports id 1000 when
150 * called on an idmapped upper mount the value written to disk - i.e., the
151 * value stored in ia_*id - must 1001. The mount mapping helper will thus take
152 * care to map 1000 to 1001.
153 * The mnt idmapping helpers are nops if the upper layer isn't idmapped.
155 static inline int ovl_do_notify_change(struct ovl_fs *ofs,
156 struct dentry *upperdentry,
159 return notify_change(ovl_upper_mnt_idmap(ofs), upperdentry, attr, NULL);
162 static inline int ovl_do_rmdir(struct ovl_fs *ofs,
163 struct inode *dir, struct dentry *dentry)
165 int err = vfs_rmdir(ovl_upper_mnt_idmap(ofs), dir, dentry);
167 pr_debug("rmdir(%pd2) = %i\n", dentry, err);
171 static inline int ovl_do_unlink(struct ovl_fs *ofs, struct inode *dir,
172 struct dentry *dentry)
174 int err = vfs_unlink(ovl_upper_mnt_idmap(ofs), dir, dentry, NULL);
176 pr_debug("unlink(%pd2) = %i\n", dentry, err);
180 static inline int ovl_do_link(struct ovl_fs *ofs, struct dentry *old_dentry,
181 struct inode *dir, struct dentry *new_dentry)
183 int err = vfs_link(old_dentry, ovl_upper_mnt_idmap(ofs), dir,
186 pr_debug("link(%pd2, %pd2) = %i\n", old_dentry, new_dentry, err);
190 static inline int ovl_do_create(struct ovl_fs *ofs,
191 struct inode *dir, struct dentry *dentry,
194 int err = vfs_create(ovl_upper_mnt_idmap(ofs), dir, dentry, mode, true);
196 pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err);
200 static inline int ovl_do_mkdir(struct ovl_fs *ofs,
201 struct inode *dir, struct dentry *dentry,
204 int err = vfs_mkdir(ovl_upper_mnt_idmap(ofs), dir, dentry, mode);
205 pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err);
209 static inline int ovl_do_mknod(struct ovl_fs *ofs,
210 struct inode *dir, struct dentry *dentry,
211 umode_t mode, dev_t dev)
213 int err = vfs_mknod(ovl_upper_mnt_idmap(ofs), dir, dentry, mode, dev);
215 pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n", dentry, mode, dev, err);
219 static inline int ovl_do_symlink(struct ovl_fs *ofs,
220 struct inode *dir, struct dentry *dentry,
223 int err = vfs_symlink(ovl_upper_mnt_idmap(ofs), dir, dentry, oldname);
225 pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err);
229 static inline ssize_t ovl_do_getxattr(const struct path *path, const char *name,
230 void *value, size_t size)
234 WARN_ON(path->dentry->d_sb != path->mnt->mnt_sb);
236 err = vfs_getxattr(mnt_idmap(path->mnt), path->dentry,
238 len = (value && err > 0) ? err : 0;
240 pr_debug("getxattr(%pd2, \"%s\", \"%*pE\", %zu, 0) = %i\n",
241 path->dentry, name, min(len, 48), value, size, err);
245 static inline ssize_t ovl_getxattr_upper(struct ovl_fs *ofs,
246 struct dentry *upperdentry,
247 enum ovl_xattr ox, void *value,
250 struct path upperpath = {
251 .dentry = upperdentry,
252 .mnt = ovl_upper_mnt(ofs),
255 return ovl_do_getxattr(&upperpath, ovl_xattr(ofs, ox), value, size);
258 static inline ssize_t ovl_path_getxattr(struct ovl_fs *ofs,
259 const struct path *path,
260 enum ovl_xattr ox, void *value,
263 return ovl_do_getxattr(path, ovl_xattr(ofs, ox), value, size);
266 static inline int ovl_do_setxattr(struct ovl_fs *ofs, struct dentry *dentry,
267 const char *name, const void *value,
268 size_t size, int flags)
270 int err = vfs_setxattr(ovl_upper_mnt_idmap(ofs), dentry, name,
273 pr_debug("setxattr(%pd2, \"%s\", \"%*pE\", %zu, %d) = %i\n",
274 dentry, name, min((int)size, 48), value, size, flags, err);
278 static inline int ovl_setxattr(struct ovl_fs *ofs, struct dentry *dentry,
279 enum ovl_xattr ox, const void *value,
282 return ovl_do_setxattr(ofs, dentry, ovl_xattr(ofs, ox), value, size, 0);
285 static inline int ovl_do_removexattr(struct ovl_fs *ofs, struct dentry *dentry,
288 int err = vfs_removexattr(ovl_upper_mnt_idmap(ofs), dentry, name);
289 pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err);
293 static inline int ovl_removexattr(struct ovl_fs *ofs, struct dentry *dentry,
296 return ovl_do_removexattr(ofs, dentry, ovl_xattr(ofs, ox));
299 static inline int ovl_do_set_acl(struct ovl_fs *ofs, struct dentry *dentry,
300 const char *acl_name, struct posix_acl *acl)
302 return vfs_set_acl(ovl_upper_mnt_idmap(ofs), dentry, acl_name, acl);
305 static inline int ovl_do_remove_acl(struct ovl_fs *ofs, struct dentry *dentry,
306 const char *acl_name)
308 return vfs_remove_acl(ovl_upper_mnt_idmap(ofs), dentry, acl_name);
311 static inline int ovl_do_rename(struct ovl_fs *ofs, struct inode *olddir,
312 struct dentry *olddentry, struct inode *newdir,
313 struct dentry *newdentry, unsigned int flags)
316 struct renamedata rd = {
317 .old_mnt_idmap = ovl_upper_mnt_idmap(ofs),
319 .old_dentry = olddentry,
320 .new_mnt_idmap = ovl_upper_mnt_idmap(ofs),
322 .new_dentry = newdentry,
326 pr_debug("rename(%pd2, %pd2, 0x%x)\n", olddentry, newdentry, flags);
327 err = vfs_rename(&rd);
329 pr_debug("...rename(%pd2, %pd2, ...) = %i\n",
330 olddentry, newdentry, err);
335 static inline int ovl_do_whiteout(struct ovl_fs *ofs,
336 struct inode *dir, struct dentry *dentry)
338 int err = vfs_whiteout(ovl_upper_mnt_idmap(ofs), dir, dentry);
339 pr_debug("whiteout(%pd2) = %i\n", dentry, err);
343 static inline struct file *ovl_do_tmpfile(struct ovl_fs *ofs,
344 struct dentry *dentry, umode_t mode)
346 struct path path = { .mnt = ovl_upper_mnt(ofs), .dentry = dentry };
347 struct file *file = vfs_tmpfile_open(ovl_upper_mnt_idmap(ofs), &path, mode,
348 O_LARGEFILE | O_WRONLY, current_cred());
349 int err = PTR_ERR_OR_ZERO(file);
351 pr_debug("tmpfile(%pd2, 0%o) = %i\n", dentry, mode, err);
355 static inline struct dentry *ovl_lookup_upper(struct ovl_fs *ofs,
357 struct dentry *base, int len)
359 return lookup_one(ovl_upper_mnt_idmap(ofs), name, base, len);
362 static inline bool ovl_open_flags_need_copy_up(int flags)
367 return ((OPEN_FMODE(flags) & FMODE_WRITE) || (flags & O_TRUNC));
372 int ovl_want_write(struct dentry *dentry);
373 void ovl_drop_write(struct dentry *dentry);
374 struct dentry *ovl_workdir(struct dentry *dentry);
375 const struct cred *ovl_override_creds(struct super_block *sb);
376 int ovl_can_decode_fh(struct super_block *sb);
377 struct dentry *ovl_indexdir(struct super_block *sb);
378 bool ovl_index_all(struct super_block *sb);
379 bool ovl_verify_lower(struct super_block *sb);
380 struct ovl_path *ovl_stack_alloc(unsigned int n);
381 void ovl_stack_cpy(struct ovl_path *dst, struct ovl_path *src, unsigned int n);
382 void ovl_stack_put(struct ovl_path *stack, unsigned int n);
383 void ovl_stack_free(struct ovl_path *stack, unsigned int n);
384 struct ovl_entry *ovl_alloc_entry(unsigned int numlower);
385 void ovl_free_entry(struct ovl_entry *oe);
386 bool ovl_dentry_remote(struct dentry *dentry);
387 void ovl_dentry_update_reval(struct dentry *dentry, struct dentry *realdentry);
388 void ovl_dentry_init_reval(struct dentry *dentry, struct dentry *upperdentry,
389 struct ovl_entry *oe);
390 void ovl_dentry_init_flags(struct dentry *dentry, struct dentry *upperdentry,
391 struct ovl_entry *oe, unsigned int mask);
392 bool ovl_dentry_weird(struct dentry *dentry);
393 enum ovl_path_type ovl_path_type(struct dentry *dentry);
394 void ovl_path_upper(struct dentry *dentry, struct path *path);
395 void ovl_path_lower(struct dentry *dentry, struct path *path);
396 void ovl_path_lowerdata(struct dentry *dentry, struct path *path);
397 struct inode *ovl_i_path_real(struct inode *inode, struct path *path);
398 enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path);
399 enum ovl_path_type ovl_path_realdata(struct dentry *dentry, struct path *path);
400 struct dentry *ovl_dentry_upper(struct dentry *dentry);
401 struct dentry *ovl_dentry_lower(struct dentry *dentry);
402 struct dentry *ovl_dentry_lowerdata(struct dentry *dentry);
403 int ovl_dentry_set_lowerdata(struct dentry *dentry, struct ovl_path *datapath);
404 const struct ovl_layer *ovl_i_layer_lower(struct inode *inode);
405 const struct ovl_layer *ovl_layer_lower(struct dentry *dentry);
406 struct dentry *ovl_dentry_real(struct dentry *dentry);
407 struct dentry *ovl_i_dentry_upper(struct inode *inode);
408 struct inode *ovl_inode_upper(struct inode *inode);
409 struct inode *ovl_inode_lower(struct inode *inode);
410 struct inode *ovl_inode_lowerdata(struct inode *inode);
411 struct inode *ovl_inode_real(struct inode *inode);
412 struct inode *ovl_inode_realdata(struct inode *inode);
413 const char *ovl_lowerdata_redirect(struct inode *inode);
414 struct ovl_dir_cache *ovl_dir_cache(struct inode *inode);
415 void ovl_set_dir_cache(struct inode *inode, struct ovl_dir_cache *cache);
416 void ovl_dentry_set_flag(unsigned long flag, struct dentry *dentry);
417 void ovl_dentry_clear_flag(unsigned long flag, struct dentry *dentry);
418 bool ovl_dentry_test_flag(unsigned long flag, struct dentry *dentry);
419 bool ovl_dentry_is_opaque(struct dentry *dentry);
420 bool ovl_dentry_is_whiteout(struct dentry *dentry);
421 void ovl_dentry_set_opaque(struct dentry *dentry);
422 bool ovl_dentry_has_upper_alias(struct dentry *dentry);
423 void ovl_dentry_set_upper_alias(struct dentry *dentry);
424 bool ovl_dentry_needs_data_copy_up(struct dentry *dentry, int flags);
425 bool ovl_dentry_needs_data_copy_up_locked(struct dentry *dentry, int flags);
426 bool ovl_has_upperdata(struct inode *inode);
427 void ovl_set_upperdata(struct inode *inode);
428 const char *ovl_dentry_get_redirect(struct dentry *dentry);
429 void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect);
430 void ovl_inode_update(struct inode *inode, struct dentry *upperdentry);
431 void ovl_dir_modified(struct dentry *dentry, bool impurity);
432 u64 ovl_inode_version_get(struct inode *inode);
433 bool ovl_is_whiteout(struct dentry *dentry);
434 struct file *ovl_path_open(const struct path *path, int flags);
435 int ovl_copy_up_start(struct dentry *dentry, int flags);
436 void ovl_copy_up_end(struct dentry *dentry);
437 bool ovl_already_copied_up(struct dentry *dentry, int flags);
438 bool ovl_path_check_dir_xattr(struct ovl_fs *ofs, const struct path *path,
440 bool ovl_path_check_origin_xattr(struct ovl_fs *ofs, const struct path *path);
442 static inline bool ovl_check_origin_xattr(struct ovl_fs *ofs,
443 struct dentry *upperdentry)
445 struct path upperpath = {
446 .dentry = upperdentry,
447 .mnt = ovl_upper_mnt(ofs),
449 return ovl_path_check_origin_xattr(ofs, &upperpath);
452 int ovl_check_setxattr(struct ovl_fs *ofs, struct dentry *upperdentry,
453 enum ovl_xattr ox, const void *value, size_t size,
455 int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry);
456 bool ovl_inuse_trylock(struct dentry *dentry);
457 void ovl_inuse_unlock(struct dentry *dentry);
458 bool ovl_is_inuse(struct dentry *dentry);
459 bool ovl_need_index(struct dentry *dentry);
460 int ovl_nlink_start(struct dentry *dentry);
461 void ovl_nlink_end(struct dentry *dentry);
462 int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir);
463 int ovl_check_metacopy_xattr(struct ovl_fs *ofs, const struct path *path);
464 bool ovl_is_metacopy_dentry(struct dentry *dentry);
465 char *ovl_get_redirect_xattr(struct ovl_fs *ofs, const struct path *path, int padding);
466 int ovl_sync_status(struct ovl_fs *ofs);
468 static inline void ovl_set_flag(unsigned long flag, struct inode *inode)
470 set_bit(flag, &OVL_I(inode)->flags);
473 static inline void ovl_clear_flag(unsigned long flag, struct inode *inode)
475 clear_bit(flag, &OVL_I(inode)->flags);
478 static inline bool ovl_test_flag(unsigned long flag, struct inode *inode)
480 return test_bit(flag, &OVL_I(inode)->flags);
483 static inline bool ovl_is_impuredir(struct super_block *sb,
484 struct dentry *upperdentry)
486 struct ovl_fs *ofs = OVL_FS(sb);
487 struct path upperpath = {
488 .dentry = upperdentry,
489 .mnt = ovl_upper_mnt(ofs),
492 return ovl_path_check_dir_xattr(ofs, &upperpath, OVL_XATTR_IMPURE);
495 static inline bool ovl_redirect_follow(struct ovl_fs *ofs)
497 return ofs->config.redirect_mode != OVL_REDIRECT_NOFOLLOW;
500 static inline bool ovl_redirect_dir(struct ovl_fs *ofs)
502 return ofs->config.redirect_mode == OVL_REDIRECT_ON;
506 * With xino=auto, we do best effort to keep all inodes on same st_dev and
507 * d_ino consistent with st_ino.
508 * With xino=on, we do the same effort but we warn if we failed.
510 static inline bool ovl_xino_warn(struct ovl_fs *ofs)
512 return ofs->config.xino == OVL_XINO_ON;
516 * To avoid regressions in existing setups with overlay lower offline changes,
517 * we allow lower changes only if none of the new features are used.
519 static inline bool ovl_allow_offline_changes(struct ovl_fs *ofs)
521 return (!ofs->config.index && !ofs->config.metacopy &&
522 !ovl_redirect_dir(ofs) && !ovl_xino_warn(ofs));
525 /* All layers on same fs? */
526 static inline bool ovl_same_fs(struct ovl_fs *ofs)
528 return ofs->xino_mode == 0;
531 /* All overlay inodes have same st_dev? */
532 static inline bool ovl_same_dev(struct ovl_fs *ofs)
534 return ofs->xino_mode >= 0;
537 static inline unsigned int ovl_xino_bits(struct ovl_fs *ofs)
539 return ovl_same_dev(ofs) ? ofs->xino_mode : 0;
542 static inline void ovl_inode_lock(struct inode *inode)
544 mutex_lock(&OVL_I(inode)->lock);
547 static inline int ovl_inode_lock_interruptible(struct inode *inode)
549 return mutex_lock_interruptible(&OVL_I(inode)->lock);
552 static inline void ovl_inode_unlock(struct inode *inode)
554 mutex_unlock(&OVL_I(inode)->lock);
559 int ovl_check_fb_len(struct ovl_fb *fb, int fb_len);
561 static inline int ovl_check_fh_len(struct ovl_fh *fh, int fh_len)
563 if (fh_len < sizeof(struct ovl_fh))
566 return ovl_check_fb_len(&fh->fb, fh_len - OVL_FH_WIRE_OFFSET);
569 struct dentry *ovl_decode_real_fh(struct ovl_fs *ofs, struct ovl_fh *fh,
570 struct vfsmount *mnt, bool connected);
571 int ovl_check_origin_fh(struct ovl_fs *ofs, struct ovl_fh *fh, bool connected,
572 struct dentry *upperdentry, struct ovl_path **stackp);
573 int ovl_verify_set_fh(struct ovl_fs *ofs, struct dentry *dentry,
574 enum ovl_xattr ox, struct dentry *real, bool is_upper,
576 struct dentry *ovl_index_upper(struct ovl_fs *ofs, struct dentry *index,
578 int ovl_verify_index(struct ovl_fs *ofs, struct dentry *index);
579 int ovl_get_index_name(struct ovl_fs *ofs, struct dentry *origin,
581 struct dentry *ovl_get_index_fh(struct ovl_fs *ofs, struct ovl_fh *fh);
582 struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper,
583 struct dentry *origin, bool verify);
584 int ovl_path_next(int idx, struct dentry *dentry, struct path *path);
585 int ovl_maybe_lookup_lowerdata(struct dentry *dentry);
586 struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
588 bool ovl_lower_positive(struct dentry *dentry);
590 static inline int ovl_verify_origin(struct ovl_fs *ofs, struct dentry *upper,
591 struct dentry *origin, bool set)
593 return ovl_verify_set_fh(ofs, upper, OVL_XATTR_ORIGIN, origin,
597 static inline int ovl_verify_upper(struct ovl_fs *ofs, struct dentry *index,
598 struct dentry *upper, bool set)
600 return ovl_verify_set_fh(ofs, index, OVL_XATTR_UPPER, upper, true, set);
604 extern const struct file_operations ovl_dir_operations;
605 struct file *ovl_dir_real_file(const struct file *file, bool want_upper);
606 int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list);
607 void ovl_cleanup_whiteouts(struct ovl_fs *ofs, struct dentry *upper,
608 struct list_head *list);
609 void ovl_cache_free(struct list_head *list);
610 void ovl_dir_cache_free(struct inode *inode);
611 int ovl_check_d_type_supported(const struct path *realpath);
612 int ovl_workdir_cleanup(struct ovl_fs *ofs, struct inode *dir,
613 struct vfsmount *mnt, struct dentry *dentry, int level);
614 int ovl_indexdir_cleanup(struct ovl_fs *ofs);
617 * Can we iterate real dir directly?
619 * Non-merge dir may contain whiteouts from a time it was a merge upper, before
620 * lower dir was removed under it and possibly before it was rotated from upper
623 static inline bool ovl_dir_is_real(struct inode *dir)
625 return !ovl_test_flag(OVL_WHITEOUTS, dir);
629 int ovl_set_nlink_upper(struct dentry *dentry);
630 int ovl_set_nlink_lower(struct dentry *dentry);
631 unsigned int ovl_get_nlink(struct ovl_fs *ofs, struct dentry *lowerdentry,
632 struct dentry *upperdentry,
633 unsigned int fallback);
634 int ovl_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
636 int ovl_getattr(struct mnt_idmap *idmap, const struct path *path,
637 struct kstat *stat, u32 request_mask, unsigned int flags);
638 int ovl_permission(struct mnt_idmap *idmap, struct inode *inode,
640 int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name,
641 const void *value, size_t size, int flags);
642 int ovl_xattr_get(struct dentry *dentry, struct inode *inode, const char *name,
643 void *value, size_t size);
644 ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size);
646 #ifdef CONFIG_FS_POSIX_ACL
647 struct posix_acl *do_ovl_get_acl(struct mnt_idmap *idmap,
648 struct inode *inode, int type,
649 bool rcu, bool noperm);
650 static inline struct posix_acl *ovl_get_inode_acl(struct inode *inode, int type,
653 return do_ovl_get_acl(&nop_mnt_idmap, inode, type, rcu, true);
655 static inline struct posix_acl *ovl_get_acl(struct mnt_idmap *idmap,
656 struct dentry *dentry, int type)
658 return do_ovl_get_acl(idmap, d_inode(dentry), type, false, false);
660 int ovl_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
661 struct posix_acl *acl, int type);
662 struct posix_acl *ovl_get_acl_path(const struct path *path,
663 const char *acl_name, bool noperm);
665 #define ovl_get_inode_acl NULL
666 #define ovl_get_acl NULL
667 #define ovl_set_acl NULL
668 static inline struct posix_acl *ovl_get_acl_path(const struct path *path,
669 const char *acl_name,
676 int ovl_update_time(struct inode *inode, struct timespec64 *ts, int flags);
677 bool ovl_is_private_xattr(struct super_block *sb, const char *name);
679 struct ovl_inode_params {
680 struct inode *newinode;
681 struct dentry *upperdentry;
682 struct ovl_entry *oe;
685 char *lowerdata_redirect;
687 void ovl_inode_init(struct inode *inode, struct ovl_inode_params *oip,
688 unsigned long ino, int fsid);
689 struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev);
690 struct inode *ovl_lookup_inode(struct super_block *sb, struct dentry *real,
692 bool ovl_lookup_trap_inode(struct super_block *sb, struct dentry *dir);
693 struct inode *ovl_get_trap_inode(struct super_block *sb, struct dentry *dir);
694 struct inode *ovl_get_inode(struct super_block *sb,
695 struct ovl_inode_params *oip);
696 void ovl_copyattr(struct inode *to);
698 /* vfs inode flags copied from real to ovl inode */
699 #define OVL_COPY_I_FLAGS_MASK (S_SYNC | S_NOATIME | S_APPEND | S_IMMUTABLE)
700 /* vfs inode flags read from overlay.protattr xattr to ovl inode */
701 #define OVL_PROT_I_FLAGS_MASK (S_APPEND | S_IMMUTABLE)
704 * fileattr flags copied from lower to upper inode on copy up.
705 * We cannot copy up immutable/append-only flags, because that would prevent
706 * linking temp inode to upper dir, so we store them in xattr instead.
708 #define OVL_COPY_FS_FLAGS_MASK (FS_SYNC_FL | FS_NOATIME_FL)
709 #define OVL_COPY_FSX_FLAGS_MASK (FS_XFLAG_SYNC | FS_XFLAG_NOATIME)
710 #define OVL_PROT_FS_FLAGS_MASK (FS_APPEND_FL | FS_IMMUTABLE_FL)
711 #define OVL_PROT_FSX_FLAGS_MASK (FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE)
713 void ovl_check_protattr(struct inode *inode, struct dentry *upper);
714 int ovl_set_protattr(struct inode *inode, struct dentry *upper,
715 struct fileattr *fa);
717 static inline void ovl_copyflags(struct inode *from, struct inode *to)
719 unsigned int mask = OVL_COPY_I_FLAGS_MASK;
721 inode_set_flags(to, from->i_flags & mask, mask);
725 extern const struct inode_operations ovl_dir_inode_operations;
726 int ovl_cleanup_and_whiteout(struct ovl_fs *ofs, struct inode *dir,
727 struct dentry *dentry);
732 struct dentry *hardlink;
735 #define OVL_CATTR(m) (&(struct ovl_cattr) { .mode = (m) })
737 int ovl_mkdir_real(struct ovl_fs *ofs, struct inode *dir,
738 struct dentry **newdentry, umode_t mode);
739 struct dentry *ovl_create_real(struct ovl_fs *ofs,
740 struct inode *dir, struct dentry *newdentry,
741 struct ovl_cattr *attr);
742 int ovl_cleanup(struct ovl_fs *ofs, struct inode *dir, struct dentry *dentry);
743 struct dentry *ovl_lookup_temp(struct ovl_fs *ofs, struct dentry *workdir);
744 struct dentry *ovl_create_temp(struct ovl_fs *ofs, struct dentry *workdir,
745 struct ovl_cattr *attr);
748 extern const struct file_operations ovl_file_operations;
749 int __init ovl_aio_request_cache_init(void);
750 void ovl_aio_request_cache_destroy(void);
751 int ovl_real_fileattr_get(const struct path *realpath, struct fileattr *fa);
752 int ovl_real_fileattr_set(const struct path *realpath, struct fileattr *fa);
753 int ovl_fileattr_get(struct dentry *dentry, struct fileattr *fa);
754 int ovl_fileattr_set(struct mnt_idmap *idmap,
755 struct dentry *dentry, struct fileattr *fa);
758 int ovl_copy_up(struct dentry *dentry);
759 int ovl_copy_up_with_data(struct dentry *dentry);
760 int ovl_maybe_copy_up(struct dentry *dentry, int flags);
761 int ovl_copy_xattr(struct super_block *sb, const struct path *path, struct dentry *new);
762 int ovl_set_attr(struct ovl_fs *ofs, struct dentry *upper, struct kstat *stat);
763 struct ovl_fh *ovl_encode_real_fh(struct ovl_fs *ofs, struct dentry *real,
765 int ovl_set_origin(struct ovl_fs *ofs, struct dentry *lower,
766 struct dentry *upper);
769 extern const struct export_operations ovl_export_operations;