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. */
67 * The tuple (fh,uuid) is a universal unique identifier for a copy up origin,
69 * origin.fh - exported file handle of the lower file
70 * origin.uuid - uuid of the lower filesystem
72 #define OVL_FH_VERSION 0
73 #define OVL_FH_MAGIC 0xfb
75 /* CPU byte order required for fid decoding: */
76 #define OVL_FH_FLAG_BIG_ENDIAN (1 << 0)
77 #define OVL_FH_FLAG_ANY_ENDIAN (1 << 1)
78 /* Is the real inode encoded in fid an upper inode? */
79 #define OVL_FH_FLAG_PATH_UPPER (1 << 2)
81 #define OVL_FH_FLAG_ALL (OVL_FH_FLAG_BIG_ENDIAN | OVL_FH_FLAG_ANY_ENDIAN | \
82 OVL_FH_FLAG_PATH_UPPER)
84 #if defined(__LITTLE_ENDIAN)
85 #define OVL_FH_FLAG_CPU_ENDIAN 0
86 #elif defined(__BIG_ENDIAN)
87 #define OVL_FH_FLAG_CPU_ENDIAN OVL_FH_FLAG_BIG_ENDIAN
89 #error Endianness not defined
92 /* The type used to be returned by overlay exportfs for misaligned fid */
93 #define OVL_FILEID_V0 0xfb
94 /* The type returned by overlay exportfs for 32bit aligned fid */
95 #define OVL_FILEID_V1 0xf8
97 /* On-disk format for "origin" file handle */
101 u8 len
; /* size of this header + size of fid */
102 u8 flags
; /* OVL_FH_FLAG_* */
103 u8 type
; /* fid_type of fid */
104 uuid_t uuid
; /* uuid of filesystem */
105 u32 fid
[]; /* file identifier should be 32bit aligned in-memory */
108 /* In-memory and on-wire format for overlay file handle */
110 u8 padding
[3]; /* make sure fb.fid is 32bit aligned */
113 DECLARE_FLEX_ARRAY(u8
, buf
);
117 #define OVL_FH_WIRE_OFFSET offsetof(struct ovl_fh, fb)
118 #define OVL_FH_LEN(fh) (OVL_FH_WIRE_OFFSET + (fh)->fb.len)
119 #define OVL_FH_FID_OFFSET (OVL_FH_WIRE_OFFSET + \
120 offsetof(struct ovl_fb, fid))
122 extern const char *const ovl_xattr_table
[][2];
123 static inline const char *ovl_xattr(struct ovl_fs
*ofs
, enum ovl_xattr ox
)
125 return ovl_xattr_table
[ox
][ofs
->config
.userxattr
];
129 * When changing ownership of an upper object map the intended ownership
130 * according to the upper layer's idmapping. When an upper mount idmaps files
131 * that are stored on-disk as owned by id 1001 to id 1000 this means stat on
132 * this object will report it as being owned by id 1000 when calling stat via
134 * In order to change ownership of an object so stat reports id 1000 when
135 * called on an idmapped upper mount the value written to disk - i.e., the
136 * value stored in ia_*id - must 1001. The mount mapping helper will thus take
137 * care to map 1000 to 1001.
138 * The mnt idmapping helpers are nops if the upper layer isn't idmapped.
140 static inline int ovl_do_notify_change(struct ovl_fs
*ofs
,
141 struct dentry
*upperdentry
,
144 return notify_change(ovl_upper_mnt_idmap(ofs
), upperdentry
, attr
, NULL
);
147 static inline int ovl_do_rmdir(struct ovl_fs
*ofs
,
148 struct inode
*dir
, struct dentry
*dentry
)
150 int err
= vfs_rmdir(ovl_upper_mnt_idmap(ofs
), dir
, dentry
);
152 pr_debug("rmdir(%pd2) = %i\n", dentry
, err
);
156 static inline int ovl_do_unlink(struct ovl_fs
*ofs
, struct inode
*dir
,
157 struct dentry
*dentry
)
159 int err
= vfs_unlink(ovl_upper_mnt_idmap(ofs
), dir
, dentry
, NULL
);
161 pr_debug("unlink(%pd2) = %i\n", dentry
, err
);
165 static inline int ovl_do_link(struct ovl_fs
*ofs
, struct dentry
*old_dentry
,
166 struct inode
*dir
, struct dentry
*new_dentry
)
168 int err
= vfs_link(old_dentry
, ovl_upper_mnt_idmap(ofs
), dir
,
171 pr_debug("link(%pd2, %pd2) = %i\n", old_dentry
, new_dentry
, err
);
175 static inline int ovl_do_create(struct ovl_fs
*ofs
,
176 struct inode
*dir
, struct dentry
*dentry
,
179 int err
= vfs_create(ovl_upper_mnt_idmap(ofs
), dir
, dentry
, mode
, true);
181 pr_debug("create(%pd2, 0%o) = %i\n", dentry
, mode
, err
);
185 static inline int ovl_do_mkdir(struct ovl_fs
*ofs
,
186 struct inode
*dir
, struct dentry
*dentry
,
189 int err
= vfs_mkdir(ovl_upper_mnt_idmap(ofs
), dir
, dentry
, mode
);
190 pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry
, mode
, err
);
194 static inline int ovl_do_mknod(struct ovl_fs
*ofs
,
195 struct inode
*dir
, struct dentry
*dentry
,
196 umode_t mode
, dev_t dev
)
198 int err
= vfs_mknod(ovl_upper_mnt_idmap(ofs
), dir
, dentry
, mode
, dev
);
200 pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n", dentry
, mode
, dev
, err
);
204 static inline int ovl_do_symlink(struct ovl_fs
*ofs
,
205 struct inode
*dir
, struct dentry
*dentry
,
208 int err
= vfs_symlink(ovl_upper_mnt_idmap(ofs
), dir
, dentry
, oldname
);
210 pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname
, dentry
, err
);
214 static inline ssize_t
ovl_do_getxattr(const struct path
*path
, const char *name
,
215 void *value
, size_t size
)
219 WARN_ON(path
->dentry
->d_sb
!= path
->mnt
->mnt_sb
);
221 err
= vfs_getxattr(mnt_user_ns(path
->mnt
), path
->dentry
,
223 len
= (value
&& err
> 0) ? err
: 0;
225 pr_debug("getxattr(%pd2, \"%s\", \"%*pE\", %zu, 0) = %i\n",
226 path
->dentry
, name
, min(len
, 48), value
, size
, err
);
230 static inline ssize_t
ovl_getxattr_upper(struct ovl_fs
*ofs
,
231 struct dentry
*upperdentry
,
232 enum ovl_xattr ox
, void *value
,
235 struct path upperpath
= {
236 .dentry
= upperdentry
,
237 .mnt
= ovl_upper_mnt(ofs
),
240 return ovl_do_getxattr(&upperpath
, ovl_xattr(ofs
, ox
), value
, size
);
243 static inline ssize_t
ovl_path_getxattr(struct ovl_fs
*ofs
,
244 const struct path
*path
,
245 enum ovl_xattr ox
, void *value
,
248 return ovl_do_getxattr(path
, ovl_xattr(ofs
, ox
), value
, size
);
251 static inline int ovl_do_setxattr(struct ovl_fs
*ofs
, struct dentry
*dentry
,
252 const char *name
, const void *value
,
253 size_t size
, int flags
)
255 int err
= vfs_setxattr(ovl_upper_mnt_userns(ofs
), dentry
, name
,
258 pr_debug("setxattr(%pd2, \"%s\", \"%*pE\", %zu, %d) = %i\n",
259 dentry
, name
, min((int)size
, 48), value
, size
, flags
, err
);
263 static inline int ovl_setxattr(struct ovl_fs
*ofs
, struct dentry
*dentry
,
264 enum ovl_xattr ox
, const void *value
,
267 return ovl_do_setxattr(ofs
, dentry
, ovl_xattr(ofs
, ox
), value
, size
, 0);
270 static inline int ovl_do_removexattr(struct ovl_fs
*ofs
, struct dentry
*dentry
,
273 int err
= vfs_removexattr(ovl_upper_mnt_userns(ofs
), dentry
, name
);
274 pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry
, name
, err
);
278 static inline int ovl_removexattr(struct ovl_fs
*ofs
, struct dentry
*dentry
,
281 return ovl_do_removexattr(ofs
, dentry
, ovl_xattr(ofs
, ox
));
284 static inline int ovl_do_set_acl(struct ovl_fs
*ofs
, struct dentry
*dentry
,
285 const char *acl_name
, struct posix_acl
*acl
)
287 return vfs_set_acl(ovl_upper_mnt_idmap(ofs
), dentry
, acl_name
, acl
);
290 static inline int ovl_do_remove_acl(struct ovl_fs
*ofs
, struct dentry
*dentry
,
291 const char *acl_name
)
293 return vfs_remove_acl(ovl_upper_mnt_idmap(ofs
), dentry
, acl_name
);
296 static inline int ovl_do_rename(struct ovl_fs
*ofs
, struct inode
*olddir
,
297 struct dentry
*olddentry
, struct inode
*newdir
,
298 struct dentry
*newdentry
, unsigned int flags
)
301 struct renamedata rd
= {
302 .old_mnt_idmap
= ovl_upper_mnt_idmap(ofs
),
304 .old_dentry
= olddentry
,
305 .new_mnt_idmap
= ovl_upper_mnt_idmap(ofs
),
307 .new_dentry
= newdentry
,
311 pr_debug("rename(%pd2, %pd2, 0x%x)\n", olddentry
, newdentry
, flags
);
312 err
= vfs_rename(&rd
);
314 pr_debug("...rename(%pd2, %pd2, ...) = %i\n",
315 olddentry
, newdentry
, err
);
320 static inline int ovl_do_whiteout(struct ovl_fs
*ofs
,
321 struct inode
*dir
, struct dentry
*dentry
)
323 int err
= vfs_whiteout(ovl_upper_mnt_idmap(ofs
), dir
, dentry
);
324 pr_debug("whiteout(%pd2) = %i\n", dentry
, err
);
328 static inline struct file
*ovl_do_tmpfile(struct ovl_fs
*ofs
,
329 struct dentry
*dentry
, umode_t mode
)
331 struct path path
= { .mnt
= ovl_upper_mnt(ofs
), .dentry
= dentry
};
332 struct file
*file
= vfs_tmpfile_open(ovl_upper_mnt_idmap(ofs
), &path
, mode
,
333 O_LARGEFILE
| O_WRONLY
, current_cred());
334 int err
= PTR_ERR_OR_ZERO(file
);
336 pr_debug("tmpfile(%pd2, 0%o) = %i\n", dentry
, mode
, err
);
340 static inline struct dentry
*ovl_lookup_upper(struct ovl_fs
*ofs
,
342 struct dentry
*base
, int len
)
344 return lookup_one(ovl_upper_mnt_userns(ofs
), name
, base
, len
);
347 static inline bool ovl_open_flags_need_copy_up(int flags
)
352 return ((OPEN_FMODE(flags
) & FMODE_WRITE
) || (flags
& O_TRUNC
));
355 static inline bool ovl_allow_offline_changes(struct ovl_fs
*ofs
)
358 * To avoid regressions in existing setups with overlay lower offline
359 * changes, we allow lower changes only if none of the new features
362 return (!ofs
->config
.index
&& !ofs
->config
.metacopy
&&
363 !ofs
->config
.redirect_dir
&& ofs
->config
.xino
!= OVL_XINO_ON
);
368 int ovl_want_write(struct dentry
*dentry
);
369 void ovl_drop_write(struct dentry
*dentry
);
370 struct dentry
*ovl_workdir(struct dentry
*dentry
);
371 const struct cred
*ovl_override_creds(struct super_block
*sb
);
372 int ovl_can_decode_fh(struct super_block
*sb
);
373 struct dentry
*ovl_indexdir(struct super_block
*sb
);
374 bool ovl_index_all(struct super_block
*sb
);
375 bool ovl_verify_lower(struct super_block
*sb
);
376 struct ovl_entry
*ovl_alloc_entry(unsigned int numlower
);
377 bool ovl_dentry_remote(struct dentry
*dentry
);
378 void ovl_dentry_update_reval(struct dentry
*dentry
, struct dentry
*upperdentry
,
380 bool ovl_dentry_weird(struct dentry
*dentry
);
381 enum ovl_path_type
ovl_path_type(struct dentry
*dentry
);
382 void ovl_path_upper(struct dentry
*dentry
, struct path
*path
);
383 void ovl_path_lower(struct dentry
*dentry
, struct path
*path
);
384 void ovl_path_lowerdata(struct dentry
*dentry
, struct path
*path
);
385 void ovl_i_path_real(struct inode
*inode
, struct path
*path
);
386 enum ovl_path_type
ovl_path_real(struct dentry
*dentry
, struct path
*path
);
387 enum ovl_path_type
ovl_path_realdata(struct dentry
*dentry
, struct path
*path
);
388 struct dentry
*ovl_dentry_upper(struct dentry
*dentry
);
389 struct dentry
*ovl_dentry_lower(struct dentry
*dentry
);
390 struct dentry
*ovl_dentry_lowerdata(struct dentry
*dentry
);
391 const struct ovl_layer
*ovl_i_layer_lower(struct inode
*inode
);
392 const struct ovl_layer
*ovl_layer_lower(struct dentry
*dentry
);
393 struct dentry
*ovl_dentry_real(struct dentry
*dentry
);
394 struct dentry
*ovl_i_dentry_upper(struct inode
*inode
);
395 struct inode
*ovl_inode_upper(struct inode
*inode
);
396 struct inode
*ovl_inode_lower(struct inode
*inode
);
397 struct inode
*ovl_inode_lowerdata(struct inode
*inode
);
398 struct inode
*ovl_inode_real(struct inode
*inode
);
399 struct inode
*ovl_inode_realdata(struct inode
*inode
);
400 struct ovl_dir_cache
*ovl_dir_cache(struct inode
*inode
);
401 void ovl_set_dir_cache(struct inode
*inode
, struct ovl_dir_cache
*cache
);
402 void ovl_dentry_set_flag(unsigned long flag
, struct dentry
*dentry
);
403 void ovl_dentry_clear_flag(unsigned long flag
, struct dentry
*dentry
);
404 bool ovl_dentry_test_flag(unsigned long flag
, struct dentry
*dentry
);
405 bool ovl_dentry_is_opaque(struct dentry
*dentry
);
406 bool ovl_dentry_is_whiteout(struct dentry
*dentry
);
407 void ovl_dentry_set_opaque(struct dentry
*dentry
);
408 bool ovl_dentry_has_upper_alias(struct dentry
*dentry
);
409 void ovl_dentry_set_upper_alias(struct dentry
*dentry
);
410 bool ovl_dentry_needs_data_copy_up(struct dentry
*dentry
, int flags
);
411 bool ovl_dentry_needs_data_copy_up_locked(struct dentry
*dentry
, int flags
);
412 bool ovl_has_upperdata(struct inode
*inode
);
413 void ovl_set_upperdata(struct inode
*inode
);
414 bool ovl_redirect_dir(struct super_block
*sb
);
415 const char *ovl_dentry_get_redirect(struct dentry
*dentry
);
416 void ovl_dentry_set_redirect(struct dentry
*dentry
, const char *redirect
);
417 void ovl_inode_update(struct inode
*inode
, struct dentry
*upperdentry
);
418 void ovl_dir_modified(struct dentry
*dentry
, bool impurity
);
419 u64
ovl_inode_version_get(struct inode
*inode
);
420 bool ovl_is_whiteout(struct dentry
*dentry
);
421 struct file
*ovl_path_open(const struct path
*path
, int flags
);
422 int ovl_copy_up_start(struct dentry
*dentry
, int flags
);
423 void ovl_copy_up_end(struct dentry
*dentry
);
424 bool ovl_already_copied_up(struct dentry
*dentry
, int flags
);
425 bool ovl_path_check_dir_xattr(struct ovl_fs
*ofs
, const struct path
*path
,
427 bool ovl_path_check_origin_xattr(struct ovl_fs
*ofs
, const struct path
*path
);
429 static inline bool ovl_check_origin_xattr(struct ovl_fs
*ofs
,
430 struct dentry
*upperdentry
)
432 struct path upperpath
= {
433 .dentry
= upperdentry
,
434 .mnt
= ovl_upper_mnt(ofs
),
436 return ovl_path_check_origin_xattr(ofs
, &upperpath
);
439 int ovl_check_setxattr(struct ovl_fs
*ofs
, struct dentry
*upperdentry
,
440 enum ovl_xattr ox
, const void *value
, size_t size
,
442 int ovl_set_impure(struct dentry
*dentry
, struct dentry
*upperdentry
);
443 bool ovl_inuse_trylock(struct dentry
*dentry
);
444 void ovl_inuse_unlock(struct dentry
*dentry
);
445 bool ovl_is_inuse(struct dentry
*dentry
);
446 bool ovl_need_index(struct dentry
*dentry
);
447 int ovl_nlink_start(struct dentry
*dentry
);
448 void ovl_nlink_end(struct dentry
*dentry
);
449 int ovl_lock_rename_workdir(struct dentry
*workdir
, struct dentry
*upperdir
);
450 int ovl_check_metacopy_xattr(struct ovl_fs
*ofs
, const struct path
*path
);
451 bool ovl_is_metacopy_dentry(struct dentry
*dentry
);
452 char *ovl_get_redirect_xattr(struct ovl_fs
*ofs
, const struct path
*path
, int padding
);
453 int ovl_sync_status(struct ovl_fs
*ofs
);
455 static inline void ovl_set_flag(unsigned long flag
, struct inode
*inode
)
457 set_bit(flag
, &OVL_I(inode
)->flags
);
460 static inline void ovl_clear_flag(unsigned long flag
, struct inode
*inode
)
462 clear_bit(flag
, &OVL_I(inode
)->flags
);
465 static inline bool ovl_test_flag(unsigned long flag
, struct inode
*inode
)
467 return test_bit(flag
, &OVL_I(inode
)->flags
);
470 static inline bool ovl_is_impuredir(struct super_block
*sb
,
471 struct dentry
*upperdentry
)
473 struct ovl_fs
*ofs
= OVL_FS(sb
);
474 struct path upperpath
= {
475 .dentry
= upperdentry
,
476 .mnt
= ovl_upper_mnt(ofs
),
479 return ovl_path_check_dir_xattr(ofs
, &upperpath
, OVL_XATTR_IMPURE
);
483 * With xino=auto, we do best effort to keep all inodes on same st_dev and
484 * d_ino consistent with st_ino.
485 * With xino=on, we do the same effort but we warn if we failed.
487 static inline bool ovl_xino_warn(struct super_block
*sb
)
489 return OVL_FS(sb
)->config
.xino
== OVL_XINO_ON
;
492 /* All layers on same fs? */
493 static inline bool ovl_same_fs(struct super_block
*sb
)
495 return OVL_FS(sb
)->xino_mode
== 0;
498 /* All overlay inodes have same st_dev? */
499 static inline bool ovl_same_dev(struct super_block
*sb
)
501 return OVL_FS(sb
)->xino_mode
>= 0;
504 static inline unsigned int ovl_xino_bits(struct super_block
*sb
)
506 return ovl_same_dev(sb
) ? OVL_FS(sb
)->xino_mode
: 0;
509 static inline void ovl_inode_lock(struct inode
*inode
)
511 mutex_lock(&OVL_I(inode
)->lock
);
514 static inline int ovl_inode_lock_interruptible(struct inode
*inode
)
516 return mutex_lock_interruptible(&OVL_I(inode
)->lock
);
519 static inline void ovl_inode_unlock(struct inode
*inode
)
521 mutex_unlock(&OVL_I(inode
)->lock
);
526 int ovl_check_fb_len(struct ovl_fb
*fb
, int fb_len
);
528 static inline int ovl_check_fh_len(struct ovl_fh
*fh
, int fh_len
)
530 if (fh_len
< sizeof(struct ovl_fh
))
533 return ovl_check_fb_len(&fh
->fb
, fh_len
- OVL_FH_WIRE_OFFSET
);
536 struct dentry
*ovl_decode_real_fh(struct ovl_fs
*ofs
, struct ovl_fh
*fh
,
537 struct vfsmount
*mnt
, bool connected
);
538 int ovl_check_origin_fh(struct ovl_fs
*ofs
, struct ovl_fh
*fh
, bool connected
,
539 struct dentry
*upperdentry
, struct ovl_path
**stackp
);
540 int ovl_verify_set_fh(struct ovl_fs
*ofs
, struct dentry
*dentry
,
541 enum ovl_xattr ox
, struct dentry
*real
, bool is_upper
,
543 struct dentry
*ovl_index_upper(struct ovl_fs
*ofs
, struct dentry
*index
,
545 int ovl_verify_index(struct ovl_fs
*ofs
, struct dentry
*index
);
546 int ovl_get_index_name(struct ovl_fs
*ofs
, struct dentry
*origin
,
548 struct dentry
*ovl_get_index_fh(struct ovl_fs
*ofs
, struct ovl_fh
*fh
);
549 struct dentry
*ovl_lookup_index(struct ovl_fs
*ofs
, struct dentry
*upper
,
550 struct dentry
*origin
, bool verify
);
551 int ovl_path_next(int idx
, struct dentry
*dentry
, struct path
*path
);
552 struct dentry
*ovl_lookup(struct inode
*dir
, struct dentry
*dentry
,
554 bool ovl_lower_positive(struct dentry
*dentry
);
556 static inline int ovl_verify_origin(struct ovl_fs
*ofs
, struct dentry
*upper
,
557 struct dentry
*origin
, bool set
)
559 return ovl_verify_set_fh(ofs
, upper
, OVL_XATTR_ORIGIN
, origin
,
563 static inline int ovl_verify_upper(struct ovl_fs
*ofs
, struct dentry
*index
,
564 struct dentry
*upper
, bool set
)
566 return ovl_verify_set_fh(ofs
, index
, OVL_XATTR_UPPER
, upper
, true, set
);
570 extern const struct file_operations ovl_dir_operations
;
571 struct file
*ovl_dir_real_file(const struct file
*file
, bool want_upper
);
572 int ovl_check_empty_dir(struct dentry
*dentry
, struct list_head
*list
);
573 void ovl_cleanup_whiteouts(struct ovl_fs
*ofs
, struct dentry
*upper
,
574 struct list_head
*list
);
575 void ovl_cache_free(struct list_head
*list
);
576 void ovl_dir_cache_free(struct inode
*inode
);
577 int ovl_check_d_type_supported(const struct path
*realpath
);
578 int ovl_workdir_cleanup(struct ovl_fs
*ofs
, struct inode
*dir
,
579 struct vfsmount
*mnt
, struct dentry
*dentry
, int level
);
580 int ovl_indexdir_cleanup(struct ovl_fs
*ofs
);
583 * Can we iterate real dir directly?
585 * Non-merge dir may contain whiteouts from a time it was a merge upper, before
586 * lower dir was removed under it and possibly before it was rotated from upper
589 static inline bool ovl_dir_is_real(struct inode
*dir
)
591 return !ovl_test_flag(OVL_WHITEOUTS
, dir
);
595 int ovl_set_nlink_upper(struct dentry
*dentry
);
596 int ovl_set_nlink_lower(struct dentry
*dentry
);
597 unsigned int ovl_get_nlink(struct ovl_fs
*ofs
, struct dentry
*lowerdentry
,
598 struct dentry
*upperdentry
,
599 unsigned int fallback
);
600 int ovl_setattr(struct mnt_idmap
*idmap
, struct dentry
*dentry
,
602 int ovl_getattr(struct mnt_idmap
*idmap
, const struct path
*path
,
603 struct kstat
*stat
, u32 request_mask
, unsigned int flags
);
604 int ovl_permission(struct user_namespace
*mnt_userns
, struct inode
*inode
,
606 int ovl_xattr_set(struct dentry
*dentry
, struct inode
*inode
, const char *name
,
607 const void *value
, size_t size
, int flags
);
608 int ovl_xattr_get(struct dentry
*dentry
, struct inode
*inode
, const char *name
,
609 void *value
, size_t size
);
610 ssize_t
ovl_listxattr(struct dentry
*dentry
, char *list
, size_t size
);
612 #ifdef CONFIG_FS_POSIX_ACL
613 struct posix_acl
*do_ovl_get_acl(struct mnt_idmap
*idmap
,
614 struct inode
*inode
, int type
,
615 bool rcu
, bool noperm
);
616 static inline struct posix_acl
*ovl_get_inode_acl(struct inode
*inode
, int type
,
619 return do_ovl_get_acl(&nop_mnt_idmap
, inode
, type
, rcu
, true);
621 static inline struct posix_acl
*ovl_get_acl(struct mnt_idmap
*idmap
,
622 struct dentry
*dentry
, int type
)
624 return do_ovl_get_acl(idmap
, d_inode(dentry
), type
, false, false);
626 int ovl_set_acl(struct mnt_idmap
*idmap
, struct dentry
*dentry
,
627 struct posix_acl
*acl
, int type
);
628 struct posix_acl
*ovl_get_acl_path(const struct path
*path
,
629 const char *acl_name
, bool noperm
);
631 #define ovl_get_inode_acl NULL
632 #define ovl_get_acl NULL
633 #define ovl_set_acl NULL
634 static inline struct posix_acl
*ovl_get_acl_path(const struct path
*path
,
635 const char *acl_name
,
642 int ovl_update_time(struct inode
*inode
, struct timespec64
*ts
, int flags
);
643 bool ovl_is_private_xattr(struct super_block
*sb
, const char *name
);
645 struct ovl_inode_params
{
646 struct inode
*newinode
;
647 struct dentry
*upperdentry
;
648 struct ovl_path
*lowerpath
;
650 unsigned int numlower
;
652 struct dentry
*lowerdata
;
654 void ovl_inode_init(struct inode
*inode
, struct ovl_inode_params
*oip
,
655 unsigned long ino
, int fsid
);
656 struct inode
*ovl_new_inode(struct super_block
*sb
, umode_t mode
, dev_t rdev
);
657 struct inode
*ovl_lookup_inode(struct super_block
*sb
, struct dentry
*real
,
659 bool ovl_lookup_trap_inode(struct super_block
*sb
, struct dentry
*dir
);
660 struct inode
*ovl_get_trap_inode(struct super_block
*sb
, struct dentry
*dir
);
661 struct inode
*ovl_get_inode(struct super_block
*sb
,
662 struct ovl_inode_params
*oip
);
663 void ovl_copyattr(struct inode
*to
);
665 /* vfs inode flags copied from real to ovl inode */
666 #define OVL_COPY_I_FLAGS_MASK (S_SYNC | S_NOATIME | S_APPEND | S_IMMUTABLE)
667 /* vfs inode flags read from overlay.protattr xattr to ovl inode */
668 #define OVL_PROT_I_FLAGS_MASK (S_APPEND | S_IMMUTABLE)
671 * fileattr flags copied from lower to upper inode on copy up.
672 * We cannot copy up immutable/append-only flags, because that would prevent
673 * linking temp inode to upper dir, so we store them in xattr instead.
675 #define OVL_COPY_FS_FLAGS_MASK (FS_SYNC_FL | FS_NOATIME_FL)
676 #define OVL_COPY_FSX_FLAGS_MASK (FS_XFLAG_SYNC | FS_XFLAG_NOATIME)
677 #define OVL_PROT_FS_FLAGS_MASK (FS_APPEND_FL | FS_IMMUTABLE_FL)
678 #define OVL_PROT_FSX_FLAGS_MASK (FS_XFLAG_APPEND | FS_XFLAG_IMMUTABLE)
680 void ovl_check_protattr(struct inode
*inode
, struct dentry
*upper
);
681 int ovl_set_protattr(struct inode
*inode
, struct dentry
*upper
,
682 struct fileattr
*fa
);
684 static inline void ovl_copyflags(struct inode
*from
, struct inode
*to
)
686 unsigned int mask
= OVL_COPY_I_FLAGS_MASK
;
688 inode_set_flags(to
, from
->i_flags
& mask
, mask
);
692 extern const struct inode_operations ovl_dir_inode_operations
;
693 int ovl_cleanup_and_whiteout(struct ovl_fs
*ofs
, struct inode
*dir
,
694 struct dentry
*dentry
);
699 struct dentry
*hardlink
;
702 #define OVL_CATTR(m) (&(struct ovl_cattr) { .mode = (m) })
704 int ovl_mkdir_real(struct ovl_fs
*ofs
, struct inode
*dir
,
705 struct dentry
**newdentry
, umode_t mode
);
706 struct dentry
*ovl_create_real(struct ovl_fs
*ofs
,
707 struct inode
*dir
, struct dentry
*newdentry
,
708 struct ovl_cattr
*attr
);
709 int ovl_cleanup(struct ovl_fs
*ofs
, struct inode
*dir
, struct dentry
*dentry
);
710 struct dentry
*ovl_lookup_temp(struct ovl_fs
*ofs
, struct dentry
*workdir
);
711 struct dentry
*ovl_create_temp(struct ovl_fs
*ofs
, struct dentry
*workdir
,
712 struct ovl_cattr
*attr
);
715 extern const struct file_operations ovl_file_operations
;
716 int __init
ovl_aio_request_cache_init(void);
717 void ovl_aio_request_cache_destroy(void);
718 int ovl_real_fileattr_get(const struct path
*realpath
, struct fileattr
*fa
);
719 int ovl_real_fileattr_set(const struct path
*realpath
, struct fileattr
*fa
);
720 int ovl_fileattr_get(struct dentry
*dentry
, struct fileattr
*fa
);
721 int ovl_fileattr_set(struct user_namespace
*mnt_userns
,
722 struct dentry
*dentry
, struct fileattr
*fa
);
725 int ovl_copy_up(struct dentry
*dentry
);
726 int ovl_copy_up_with_data(struct dentry
*dentry
);
727 int ovl_maybe_copy_up(struct dentry
*dentry
, int flags
);
728 int ovl_copy_xattr(struct super_block
*sb
, const struct path
*path
, struct dentry
*new);
729 int ovl_set_attr(struct ovl_fs
*ofs
, struct dentry
*upper
, struct kstat
*stat
);
730 struct ovl_fh
*ovl_encode_real_fh(struct ovl_fs
*ofs
, struct dentry
*real
,
732 int ovl_set_origin(struct ovl_fs
*ofs
, struct dentry
*lower
,
733 struct dentry
*upper
);
736 extern const struct export_operations ovl_export_operations
;