[linux-block.git] / fs / overlayfs / overlayfs.h

/*
 *
 * Copyright (C) 2011 Novell Inc.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/uuid.h>

enum ovl_path_type {
	__OVL_PATH_UPPER	= (1 << 0),
	__OVL_PATH_MERGE	= (1 << 1),
};

#define OVL_TYPE_UPPER(type)	((type) & __OVL_PATH_UPPER)
#define OVL_TYPE_MERGE(type)	((type) & __OVL_PATH_MERGE)

#define OVL_XATTR_PREFIX XATTR_TRUSTED_PREFIX "overlay."
#define OVL_XATTR_OPAQUE OVL_XATTR_PREFIX "opaque"
#define OVL_XATTR_REDIRECT OVL_XATTR_PREFIX "redirect"
#define OVL_XATTR_ORIGIN OVL_XATTR_PREFIX "origin"

/*
 * The tuple (fh,uuid) is a universal unique identifier for a copy up origin,
 * where:
 * origin.fh	- exported file handle of the lower file
 * origin.uuid	- uuid of the lower filesystem
 */
#define OVL_FH_VERSION	0
#define OVL_FH_MAGIC	0xfb

/* CPU byte order required for fid decoding:  */
#define OVL_FH_FLAG_BIG_ENDIAN	(1 << 0)
#define OVL_FH_FLAG_ANY_ENDIAN	(1 << 1)

#define OVL_FH_FLAG_ALL (OVL_FH_FLAG_BIG_ENDIAN | OVL_FH_FLAG_ANY_ENDIAN)

#if defined(__LITTLE_ENDIAN)
#define OVL_FH_FLAG_CPU_ENDIAN 0
#elif defined(__BIG_ENDIAN)
#define OVL_FH_FLAG_CPU_ENDIAN OVL_FH_FLAG_BIG_ENDIAN
#else
#error Endianness not defined
#endif

/* On-disk and in-memeory format for redirect by file handle */
struct ovl_fh {
	u8 version;	/* 0 */
	u8 magic;	/* 0xfb */
	u8 len;		/* size of this header + size of fid */
	u8 flags;	/* OVL_FH_FLAG_* */
	u8 type;	/* fid_type of fid */
	uuid_be uuid;	/* uuid of filesystem */
	u8 fid[0];	/* file identifier */
} __packed;

#define OVL_ISUPPER_MASK 1UL

static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry)
{
	int err = vfs_rmdir(dir, dentry);
	pr_debug("rmdir(%pd2) = %i\n", dentry, err);
	return err;
}

static inline int ovl_do_unlink(struct inode *dir, struct dentry *dentry)
{
	int err = vfs_unlink(dir, dentry, NULL);
	pr_debug("unlink(%pd2) = %i\n", dentry, err);
	return err;
}

static inline int ovl_do_link(struct dentry *old_dentry, struct inode *dir,
			      struct dentry *new_dentry, bool debug)
{
	int err = vfs_link(old_dentry, dir, new_dentry, NULL);
	if (debug) {
		pr_debug("link(%pd2, %pd2) = %i\n",
			 old_dentry, new_dentry, err);
	}
	return err;
}

static inline int ovl_do_create(struct inode *dir, struct dentry *dentry,
			     umode_t mode, bool debug)
{
	int err = vfs_create(dir, dentry, mode, true);
	if (debug)
		pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err);
	return err;
}

static inline int ovl_do_mkdir(struct inode *dir, struct dentry *dentry,
			       umode_t mode, bool debug)
{
	int err = vfs_mkdir(dir, dentry, mode);
	if (debug)
		pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err);
	return err;
}

static inline int ovl_do_mknod(struct inode *dir, struct dentry *dentry,
			       umode_t mode, dev_t dev, bool debug)
{
	int err = vfs_mknod(dir, dentry, mode, dev);
	if (debug) {
		pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n",
			 dentry, mode, dev, err);
	}
	return err;
}

static inline int ovl_do_symlink(struct inode *dir, struct dentry *dentry,
				 const char *oldname, bool debug)
{
	int err = vfs_symlink(dir, dentry, oldname);
	if (debug)
		pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err);
	return err;
}

static inline int ovl_do_setxattr(struct dentry *dentry, const char *name,
				  const void *value, size_t size, int flags)
{
	int err = vfs_setxattr(dentry, name, value, size, flags);
	pr_debug("setxattr(%pd2, \"%s\", \"%*s\", 0x%x) = %i\n",
		 dentry, name, (int) size, (char *) value, flags, err);
	return err;
}

static inline int ovl_do_removexattr(struct dentry *dentry, const char *name)
{
	int err = vfs_removexattr(dentry, name);
	pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err);
	return err;
}

static inline int ovl_do_rename(struct inode *olddir, struct dentry *olddentry,
				struct inode *newdir, struct dentry *newdentry,
				unsigned int flags)
{
	int err;

	pr_debug("rename(%pd2, %pd2, 0x%x)\n",
		 olddentry, newdentry, flags);

	err = vfs_rename(olddir, olddentry, newdir, newdentry, NULL, flags);

	if (err) {
		pr_debug("...rename(%pd2, %pd2, ...) = %i\n",
			 olddentry, newdentry, err);
	}
	return err;
}

static inline int ovl_do_whiteout(struct inode *dir, struct dentry *dentry)
{
	int err = vfs_whiteout(dir, dentry);
	pr_debug("whiteout(%pd2) = %i\n", dentry, err);
	return err;
}

static inline struct dentry *ovl_do_tmpfile(struct dentry *dentry, umode_t mode)
{
	struct dentry *ret = vfs_tmpfile(dentry, mode, 0);
	int err = IS_ERR(ret) ? PTR_ERR(ret) : 0;

	pr_debug("tmpfile(%pd2, 0%o) = %i\n", dentry, mode, err);
	return ret;
}

static inline struct inode *ovl_inode_real(struct inode *inode, bool *is_upper)
{
	unsigned long x = (unsigned long) READ_ONCE(inode->i_private);

	if (is_upper)
		*is_upper = x & OVL_ISUPPER_MASK;

	return (struct inode *) (x & ~OVL_ISUPPER_MASK);
}

/* util.c */
int ovl_want_write(struct dentry *dentry);
void ovl_drop_write(struct dentry *dentry);
struct dentry *ovl_workdir(struct dentry *dentry);
const struct cred *ovl_override_creds(struct super_block *sb);
struct super_block *ovl_same_sb(struct super_block *sb);
struct ovl_entry *ovl_alloc_entry(unsigned int numlower);
bool ovl_dentry_remote(struct dentry *dentry);
bool ovl_dentry_weird(struct dentry *dentry);
enum ovl_path_type ovl_path_type(struct dentry *dentry);
void ovl_path_upper(struct dentry *dentry, struct path *path);
void ovl_path_lower(struct dentry *dentry, struct path *path);
enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path);
struct dentry *ovl_dentry_upper(struct dentry *dentry);
struct dentry *ovl_dentry_lower(struct dentry *dentry);
struct dentry *ovl_dentry_real(struct dentry *dentry);
struct ovl_dir_cache *ovl_dir_cache(struct dentry *dentry);
void ovl_set_dir_cache(struct dentry *dentry, struct ovl_dir_cache *cache);
bool ovl_dentry_is_opaque(struct dentry *dentry);
bool ovl_dentry_is_whiteout(struct dentry *dentry);
void ovl_dentry_set_opaque(struct dentry *dentry);
bool ovl_redirect_dir(struct super_block *sb);
void ovl_clear_redirect_dir(struct super_block *sb);
const char *ovl_dentry_get_redirect(struct dentry *dentry);
void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect);
void ovl_dentry_update(struct dentry *dentry, struct dentry *upperdentry);
void ovl_inode_init(struct inode *inode, struct inode *realinode,
		    bool is_upper);
void ovl_inode_update(struct inode *inode, struct inode *upperinode);
void ovl_dentry_version_inc(struct dentry *dentry);
u64 ovl_dentry_version_get(struct dentry *dentry);
bool ovl_is_whiteout(struct dentry *dentry);
struct file *ovl_path_open(struct path *path, int flags);
int ovl_copy_up_start(struct dentry *dentry);
void ovl_copy_up_end(struct dentry *dentry);

/* namei.c */
int ovl_path_next(int idx, struct dentry *dentry, struct path *path);
struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags);
bool ovl_lower_positive(struct dentry *dentry);

/* readdir.c */
extern const struct file_operations ovl_dir_operations;
int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list);
void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list);
void ovl_cache_free(struct list_head *list);
int ovl_check_d_type_supported(struct path *realpath);
void ovl_workdir_cleanup(struct inode *dir, struct vfsmount *mnt,
			 struct dentry *dentry, int level);

/* inode.c */
int ovl_setattr(struct dentry *dentry, struct iattr *attr);
int ovl_permission(struct inode *inode, int mask);
int ovl_xattr_set(struct dentry *dentry, const char *name, const void *value,
		  size_t size, int flags);
int ovl_xattr_get(struct dentry *dentry, const char *name,
		  void *value, size_t size);
ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size);
struct posix_acl *ovl_get_acl(struct inode *inode, int type);
int ovl_open_maybe_copy_up(struct dentry *dentry, unsigned int file_flags);
int ovl_update_time(struct inode *inode, struct timespec *ts, int flags);
bool ovl_is_private_xattr(const char *name);

struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev);
struct inode *ovl_get_inode(struct super_block *sb, struct inode *realinode);
static inline void ovl_copyattr(struct inode *from, struct inode *to)
{
	to->i_uid = from->i_uid;
	to->i_gid = from->i_gid;
	to->i_mode = from->i_mode;
	to->i_atime = from->i_atime;
	to->i_mtime = from->i_mtime;
	to->i_ctime = from->i_ctime;
}

/* dir.c */
extern const struct inode_operations ovl_dir_inode_operations;
struct dentry *ovl_lookup_temp(struct dentry *workdir, struct dentry *dentry);
struct cattr {
	dev_t rdev;
	umode_t mode;
	const char *link;
};
int ovl_create_real(struct inode *dir, struct dentry *newdentry,
		    struct cattr *attr,
		    struct dentry *hardlink, bool debug);
void ovl_cleanup(struct inode *dir, struct dentry *dentry);

/* copy_up.c */
int ovl_copy_up(struct dentry *dentry);
int ovl_copy_up_flags(struct dentry *dentry, int flags);
int ovl_copy_xattr(struct dentry *old, struct dentry *new);
int ovl_set_attr(struct dentry *upper, struct kstat *stat);
Commit	Line	Data
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
	10	#include <linux/kernel.h>
3a1e819b	11	#include <linux/uuid.h>
e9be9d5e	12
e9be9d5e	13	enum ovl_path_type {
38e813db MS	14	__OVL_PATH_UPPER = (1 << 0),
38e813db MS	15	__OVL_PATH_MERGE = (1 << 1),
e9be9d5e MS	16	};
e9be9d5e MS	17
1afaba1e MS	18	#define OVL_TYPE_UPPER(type) ((type) & __OVL_PATH_UPPER)
1afaba1e MS	19	#define OVL_TYPE_MERGE(type) ((type) & __OVL_PATH_MERGE)
d837a49b	20
fe2b7595 AG	21	#define OVL_XATTR_PREFIX XATTR_TRUSTED_PREFIX "overlay."
fe2b7595 AG	22	#define OVL_XATTR_OPAQUE OVL_XATTR_PREFIX "opaque"
02b69b28	23	#define OVL_XATTR_REDIRECT OVL_XATTR_PREFIX "redirect"
3a1e819b AG	24	#define OVL_XATTR_ORIGIN OVL_XATTR_PREFIX "origin"
	25
	26	/*
	27	* The tuple (fh,uuid) is a universal unique identifier for a copy up origin,
	28	* where:
	29	* origin.fh - exported file handle of the lower file
	30	* origin.uuid - uuid of the lower filesystem
	31	*/
	32	#define OVL_FH_VERSION 0
	33	#define OVL_FH_MAGIC 0xfb
	34
	35	/* CPU byte order required for fid decoding: */
	36	#define OVL_FH_FLAG_BIG_ENDIAN (1 << 0)
	37	#define OVL_FH_FLAG_ANY_ENDIAN (1 << 1)
	38
	39	#define OVL_FH_FLAG_ALL (OVL_FH_FLAG_BIG_ENDIAN \| OVL_FH_FLAG_ANY_ENDIAN)
	40
	41	#if defined(__LITTLE_ENDIAN)
	42	#define OVL_FH_FLAG_CPU_ENDIAN 0
	43	#elif defined(__BIG_ENDIAN)
	44	#define OVL_FH_FLAG_CPU_ENDIAN OVL_FH_FLAG_BIG_ENDIAN
	45	#else
	46	#error Endianness not defined
	47	#endif
	48
	49	/* On-disk and in-memeory format for redirect by file handle */
	50	struct ovl_fh {
	51	u8 version; /* 0 */
	52	u8 magic; /* 0xfb */
	53	u8 len; /* size of this header + size of fid */
	54	u8 flags; /* OVL_FH_FLAG_* */
	55	u8 type; /* fid_type of fid */
	56	uuid_be uuid; /* uuid of filesystem */
	57	u8 fid[0]; /* file identifier */
	58	} __packed;
e9be9d5e	59
39b681f8 MS	60	#define OVL_ISUPPER_MASK 1UL
39b681f8 MS	61
e9be9d5e MS	62	static inline int ovl_do_rmdir(struct inode dir, struct dentry dentry)
	63	{
	64	int err = vfs_rmdir(dir, dentry);
	65	pr_debug("rmdir(%pd2) = %i\n", dentry, err);
	66	return err;
	67	}
	68
	69	static inline int ovl_do_unlink(struct inode dir, struct dentry dentry)
	70	{
	71	int err = vfs_unlink(dir, dentry, NULL);
	72	pr_debug("unlink(%pd2) = %i\n", dentry, err);
	73	return err;
	74	}
	75
	76	static inline int ovl_do_link(struct dentry old_dentry, struct inode dir,
	77	struct dentry *new_dentry, bool debug)
	78	{
	79	int err = vfs_link(old_dentry, dir, new_dentry, NULL);
	80	if (debug) {
	81	pr_debug("link(%pd2, %pd2) = %i\n",
	82	old_dentry, new_dentry, err);
	83	}
	84	return err;
	85	}
	86
	87	static inline int ovl_do_create(struct inode dir, struct dentry dentry,
	88	umode_t mode, bool debug)
	89	{
	90	int err = vfs_create(dir, dentry, mode, true);
	91	if (debug)
	92	pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err);
	93	return err;
	94	}
	95
	96	static inline int ovl_do_mkdir(struct inode dir, struct dentry dentry,
	97	umode_t mode, bool debug)
	98	{
	99	int err = vfs_mkdir(dir, dentry, mode);
	100	if (debug)
	101	pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err);
	102	return err;
	103	}
	104
	105	static inline int ovl_do_mknod(struct inode dir, struct dentry dentry,
	106	umode_t mode, dev_t dev, bool debug)
	107	{
	108	int err = vfs_mknod(dir, dentry, mode, dev);
	109	if (debug) {
	110	pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n",
	111	dentry, mode, dev, err);
	112	}
	113	return err;
	114	}
	115
	116	static inline int ovl_do_symlink(struct inode dir, struct dentry dentry,
	117	const char *oldname, bool debug)
	118	{
	119	int err = vfs_symlink(dir, dentry, oldname);
	120	if (debug)
	121	pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err);
	122	return err;
	123	}
	124
	125	static inline int ovl_do_setxattr(struct dentry dentry, const char name,
126	const void *value, size_t size, int flags)
127	{
128	int err = vfs_setxattr(dentry, name, value, size, flags);
129	pr_debug("setxattr(%pd2, \"%s\", \"%*s\", 0x%x) = %i\n",
130	dentry, name, (int) size, (char *) value, flags, err);
131	return err;
132	}
133
134	static inline int ovl_do_removexattr(struct dentry dentry, const char name)
135	{
136	int err = vfs_removexattr(dentry, name);
137	pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err);
138	return err;
139	}
140
141	static inline int ovl_do_rename(struct inode olddir, struct dentry olddentry,
142	struct inode newdir, struct dentry newdentry,
143	unsigned int flags)
144	{
145	int err;
146
2773bf00	147	pr_debug("rename(%pd2, %pd2, 0x%x)\n",
e9be9d5e MS	148	olddentry, newdentry, flags);
	149
	150	err = vfs_rename(olddir, olddentry, newdir, newdentry, NULL, flags);
	151
	152	if (err) {
2773bf00	153	pr_debug("...rename(%pd2, %pd2, ...) = %i\n",
e9be9d5e MS	154	olddentry, newdentry, err);
	155	}
	156	return err;
	157	}
	158
	159	static inline int ovl_do_whiteout(struct inode dir, struct dentry dentry)
	160	{
	161	int err = vfs_whiteout(dir, dentry);
	162	pr_debug("whiteout(%pd2) = %i\n", dentry, err);
	163	return err;
	164	}
	165
e7f52429 AG	166	static inline struct dentry ovl_do_tmpfile(struct dentry dentry, umode_t mode)
	167	{
	168	struct dentry *ret = vfs_tmpfile(dentry, mode, 0);
	169	int err = IS_ERR(ret) ? PTR_ERR(ret) : 0;
	170
	171	pr_debug("tmpfile(%pd2, 0%o) = %i\n", dentry, mode, err);
	172	return ret;
	173	}
	174
39b681f8 MS	175	static inline struct inode ovl_inode_real(struct inode inode, bool *is_upper)
	176	{
	177	unsigned long x = (unsigned long) READ_ONCE(inode->i_private);
	178
	179	if (is_upper)
	180	*is_upper = x & OVL_ISUPPER_MASK;
	181
	182	return (struct inode *) (x & ~OVL_ISUPPER_MASK);
	183	}
	184
bbb1e54d MS	185	/* util.c */
	186	int ovl_want_write(struct dentry *dentry);
	187	void ovl_drop_write(struct dentry *dentry);
	188	struct dentry ovl_workdir(struct dentry dentry);
	189	const struct cred ovl_override_creds(struct super_block sb);
7bcd74b9	190	struct super_block ovl_same_sb(struct super_block sb);
bbb1e54d MS	191	struct ovl_entry *ovl_alloc_entry(unsigned int numlower);
	192	bool ovl_dentry_remote(struct dentry *dentry);
	193	bool ovl_dentry_weird(struct dentry *dentry);
e9be9d5e	194	enum ovl_path_type ovl_path_type(struct dentry *dentry);
e9be9d5e MS	195	void ovl_path_upper(struct dentry dentry, struct path path);
	196	void ovl_path_lower(struct dentry dentry, struct path path);
	197	enum ovl_path_type ovl_path_real(struct dentry dentry, struct path path);
	198	struct dentry ovl_dentry_upper(struct dentry dentry);
	199	struct dentry ovl_dentry_lower(struct dentry dentry);
	200	struct dentry ovl_dentry_real(struct dentry dentry);
e9be9d5e MS	201	struct ovl_dir_cache ovl_dir_cache(struct dentry dentry);
e9be9d5e MS	202	void ovl_set_dir_cache(struct dentry dentry, struct ovl_dir_cache cache);
e9be9d5e	203	bool ovl_dentry_is_opaque(struct dentry *dentry);
c412ce49	204	bool ovl_dentry_is_whiteout(struct dentry *dentry);
5cf5b477	205	void ovl_dentry_set_opaque(struct dentry *dentry);
a6c60655 MS	206	bool ovl_redirect_dir(struct super_block *sb);
	207	void ovl_clear_redirect_dir(struct super_block *sb);
	208	const char ovl_dentry_get_redirect(struct dentry dentry);
	209	void ovl_dentry_set_redirect(struct dentry dentry, const char redirect);
e9be9d5e	210	void ovl_dentry_update(struct dentry dentry, struct dentry upperdentry);
bbb1e54d MS	211	void ovl_inode_init(struct inode inode, struct inode realinode,
bbb1e54d MS	212	bool is_upper);
39b681f8	213	void ovl_inode_update(struct inode inode, struct inode upperinode);
bbb1e54d MS	214	void ovl_dentry_version_inc(struct dentry *dentry);
	215	u64 ovl_dentry_version_get(struct dentry *dentry);
	216	bool ovl_is_whiteout(struct dentry *dentry);
e9be9d5e	217	struct file ovl_path_open(struct path path, int flags);
39d3d60a AG	218	int ovl_copy_up_start(struct dentry *dentry);
39d3d60a AG	219	void ovl_copy_up_end(struct dentry *dentry);
e9be9d5e	220
bbb1e54d MS	221	/* namei.c */
	222	int ovl_path_next(int idx, struct dentry dentry, struct path path);
	223	struct dentry ovl_lookup(struct inode dir, struct dentry *dentry, unsigned int flags);
	224	bool ovl_lower_positive(struct dentry *dentry);
e9be9d5e MS	225
	226	/* readdir.c */
	227	extern const struct file_operations ovl_dir_operations;
	228	int ovl_check_empty_dir(struct dentry dentry, struct list_head list);
	229	void ovl_cleanup_whiteouts(struct dentry upper, struct list_head list);
	230	void ovl_cache_free(struct list_head *list);
45aebeaf	231	int ovl_check_d_type_supported(struct path *realpath);
eea2fb48 MS	232	void ovl_workdir_cleanup(struct inode dir, struct vfsmount mnt,
eea2fb48 MS	233	struct dentry *dentry, int level);
e9be9d5e MS	234
	235	/* inode.c */
	236	int ovl_setattr(struct dentry dentry, struct iattr attr);
	237	int ovl_permission(struct inode *inode, int mask);
0e585ccc AG	238	int ovl_xattr_set(struct dentry dentry, const char name, const void *value,
0e585ccc AG	239	size_t size, int flags);
0eb45fc3 AG	240	int ovl_xattr_get(struct dentry dentry, const char name,
0eb45fc3 AG	241	void *value, size_t size);
e9be9d5e	242	ssize_t ovl_listxattr(struct dentry dentry, char list, size_t size);
39a25b2b	243	struct posix_acl ovl_get_acl(struct inode inode, int type);
2d902671	244	int ovl_open_maybe_copy_up(struct dentry *dentry, unsigned int file_flags);
d719e8f2	245	int ovl_update_time(struct inode inode, struct timespec ts, int flags);
0956254a	246	bool ovl_is_private_xattr(const char *name);
e9be9d5e	247
ca4c8a3a	248	struct inode ovl_new_inode(struct super_block sb, umode_t mode, dev_t rdev);
51f7e52d	249	struct inode ovl_get_inode(struct super_block sb, struct inode *realinode);
e9be9d5e MS	250	static inline void ovl_copyattr(struct inode from, struct inode to)
	251	{
	252	to->i_uid = from->i_uid;
	253	to->i_gid = from->i_gid;
07a2daab	254	to->i_mode = from->i_mode;
d719e8f2 MS	255	to->i_atime = from->i_atime;
	256	to->i_mtime = from->i_mtime;
	257	to->i_ctime = from->i_ctime;
e9be9d5e MS	258	}
	259
	260	/* dir.c */
	261	extern const struct inode_operations ovl_dir_inode_operations;
	262	struct dentry ovl_lookup_temp(struct dentry workdir, struct dentry *dentry);
32a3d848 AV	263	struct cattr {
	264	dev_t rdev;
	265	umode_t mode;
	266	const char *link;
	267	};
e9be9d5e	268	int ovl_create_real(struct inode dir, struct dentry newdentry,
32a3d848	269	struct cattr *attr,
e9be9d5e MS	270	struct dentry *hardlink, bool debug);
	271	void ovl_cleanup(struct inode dir, struct dentry dentry);
	272
	273	/* copy_up.c */
	274	int ovl_copy_up(struct dentry *dentry);
9aba6521	275	int ovl_copy_up_flags(struct dentry *dentry, int flags);
e9be9d5e MS	276	int ovl_copy_xattr(struct dentry old, struct dentry new);
e9be9d5e MS	277	int ovl_set_attr(struct dentry upper, struct kstat stat);