[mirror_ubuntu-artful-kernel.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),
	__OVL_PATH_ORIGIN	= (1 << 2),
};

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

#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);
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_getattr(const struct path *path, struct kstat *stat,
		u32 request_mask, unsigned int flags);
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);
int ovl_check_setxattr(struct dentry *dentry, struct dentry *upperdentry,
		       const char *name, const void *value, size_t size,
		       int xerr);
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),
59548503	16	__OVL_PATH_ORIGIN = (1 << 2),
e9be9d5e MS	17	};
e9be9d5e MS	18
1afaba1e MS	19	#define OVL_TYPE_UPPER(type) ((type) & __OVL_PATH_UPPER)
1afaba1e MS	20	#define OVL_TYPE_MERGE(type) ((type) & __OVL_PATH_MERGE)
59548503	21	#define OVL_TYPE_ORIGIN(type) ((type) & __OVL_PATH_ORIGIN)
d837a49b	22
fe2b7595 AG	23	#define OVL_XATTR_PREFIX XATTR_TRUSTED_PREFIX "overlay."
fe2b7595 AG	24	#define OVL_XATTR_OPAQUE OVL_XATTR_PREFIX "opaque"
02b69b28	25	#define OVL_XATTR_REDIRECT OVL_XATTR_PREFIX "redirect"
3a1e819b AG	26	#define OVL_XATTR_ORIGIN OVL_XATTR_PREFIX "origin"
	27
	28	/*
	29	* The tuple (fh,uuid) is a universal unique identifier for a copy up origin,
	30	* where:
	31	* origin.fh - exported file handle of the lower file
	32	* origin.uuid - uuid of the lower filesystem
	33	*/
	34	#define OVL_FH_VERSION 0
	35	#define OVL_FH_MAGIC 0xfb
	36
	37	/* CPU byte order required for fid decoding: */
	38	#define OVL_FH_FLAG_BIG_ENDIAN (1 << 0)
	39	#define OVL_FH_FLAG_ANY_ENDIAN (1 << 1)
	40
	41	#define OVL_FH_FLAG_ALL (OVL_FH_FLAG_BIG_ENDIAN \| OVL_FH_FLAG_ANY_ENDIAN)
	42
	43	#if defined(__LITTLE_ENDIAN)
	44	#define OVL_FH_FLAG_CPU_ENDIAN 0
	45	#elif defined(__BIG_ENDIAN)
	46	#define OVL_FH_FLAG_CPU_ENDIAN OVL_FH_FLAG_BIG_ENDIAN
	47	#else
	48	#error Endianness not defined
	49	#endif
	50
	51	/* On-disk and in-memeory format for redirect by file handle */
	52	struct ovl_fh {
	53	u8 version; /* 0 */
	54	u8 magic; /* 0xfb */
	55	u8 len; /* size of this header + size of fid */
	56	u8 flags; /* OVL_FH_FLAG_* */
	57	u8 type; /* fid_type of fid */
	58	uuid_be uuid; /* uuid of filesystem */
	59	u8 fid[0]; /* file identifier */
	60	} __packed;
e9be9d5e	61
39b681f8 MS	62	#define OVL_ISUPPER_MASK 1UL
39b681f8 MS	63
e9be9d5e MS	64	static inline int ovl_do_rmdir(struct inode dir, struct dentry dentry)
	65	{
	66	int err = vfs_rmdir(dir, dentry);
	67	pr_debug("rmdir(%pd2) = %i\n", dentry, err);
	68	return err;
	69	}
	70
	71	static inline int ovl_do_unlink(struct inode dir, struct dentry dentry)
	72	{
	73	int err = vfs_unlink(dir, dentry, NULL);
	74	pr_debug("unlink(%pd2) = %i\n", dentry, err);
	75	return err;
	76	}
	77
	78	static inline int ovl_do_link(struct dentry old_dentry, struct inode dir,
	79	struct dentry *new_dentry, bool debug)
	80	{
	81	int err = vfs_link(old_dentry, dir, new_dentry, NULL);
	82	if (debug) {
	83	pr_debug("link(%pd2, %pd2) = %i\n",
	84	old_dentry, new_dentry, err);
	85	}
	86	return err;
	87	}
	88
	89	static inline int ovl_do_create(struct inode dir, struct dentry dentry,
	90	umode_t mode, bool debug)
	91	{
	92	int err = vfs_create(dir, dentry, mode, true);
	93	if (debug)
	94	pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err);
	95	return err;
	96	}
	97
	98	static inline int ovl_do_mkdir(struct inode dir, struct dentry dentry,
	99	umode_t mode, bool debug)
	100	{
	101	int err = vfs_mkdir(dir, dentry, mode);
	102	if (debug)
	103	pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err);
	104	return err;
	105	}
	106
	107	static inline int ovl_do_mknod(struct inode dir, struct dentry dentry,
	108	umode_t mode, dev_t dev, bool debug)
	109	{
	110	int err = vfs_mknod(dir, dentry, mode, dev);
	111	if (debug) {
	112	pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n",
	113	dentry, mode, dev, err);
	114	}
	115	return err;
	116	}
	117
	118	static inline int ovl_do_symlink(struct inode dir, struct dentry dentry,
	119	const char *oldname, bool debug)
	120	{
	121	int err = vfs_symlink(dir, dentry, oldname);
	122	if (debug)
	123	pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err);
	124	return err;
	125	}
	126
	127	static inline int ovl_do_setxattr(struct dentry dentry, const char name,
128	const void *value, size_t size, int flags)
129	{
130	int err = vfs_setxattr(dentry, name, value, size, flags);
131	pr_debug("setxattr(%pd2, \"%s\", \"%*s\", 0x%x) = %i\n",
132	dentry, name, (int) size, (char *) value, flags, err);
133	return err;
134	}
135
136	static inline int ovl_do_removexattr(struct dentry dentry, const char name)
137	{
138	int err = vfs_removexattr(dentry, name);
139	pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err);
140	return err;
141	}
142
143	static inline int ovl_do_rename(struct inode olddir, struct dentry olddentry,
144	struct inode newdir, struct dentry newdentry,
145	unsigned int flags)
146	{
147	int err;
148
2773bf00	149	pr_debug("rename(%pd2, %pd2, 0x%x)\n",
e9be9d5e MS	150	olddentry, newdentry, flags);
	151
	152	err = vfs_rename(olddir, olddentry, newdir, newdentry, NULL, flags);
	153
	154	if (err) {
2773bf00	155	pr_debug("...rename(%pd2, %pd2, ...) = %i\n",
e9be9d5e MS	156	olddentry, newdentry, err);
	157	}
	158	return err;
	159	}
	160
	161	static inline int ovl_do_whiteout(struct inode dir, struct dentry dentry)
	162	{
	163	int err = vfs_whiteout(dir, dentry);
	164	pr_debug("whiteout(%pd2) = %i\n", dentry, err);
	165	return err;
	166	}
	167
e7f52429 AG	168	static inline struct dentry ovl_do_tmpfile(struct dentry dentry, umode_t mode)
	169	{
	170	struct dentry *ret = vfs_tmpfile(dentry, mode, 0);
	171	int err = IS_ERR(ret) ? PTR_ERR(ret) : 0;
	172
	173	pr_debug("tmpfile(%pd2, 0%o) = %i\n", dentry, mode, err);
	174	return ret;
	175	}
	176
39b681f8 MS	177	static inline struct inode ovl_inode_real(struct inode inode, bool *is_upper)
	178	{
	179	unsigned long x = (unsigned long) READ_ONCE(inode->i_private);
	180
	181	if (is_upper)
	182	*is_upper = x & OVL_ISUPPER_MASK;
	183
	184	return (struct inode *) (x & ~OVL_ISUPPER_MASK);
	185	}
	186
bbb1e54d MS	187	/* util.c */
	188	int ovl_want_write(struct dentry *dentry);
	189	void ovl_drop_write(struct dentry *dentry);
	190	struct dentry ovl_workdir(struct dentry dentry);
	191	const struct cred ovl_override_creds(struct super_block sb);
7bcd74b9	192	struct super_block ovl_same_sb(struct super_block sb);
bbb1e54d MS	193	struct ovl_entry *ovl_alloc_entry(unsigned int numlower);
	194	bool ovl_dentry_remote(struct dentry *dentry);
	195	bool ovl_dentry_weird(struct dentry *dentry);
e9be9d5e	196	enum ovl_path_type ovl_path_type(struct dentry *dentry);
e9be9d5e MS	197	void ovl_path_upper(struct dentry dentry, struct path path);
	198	void ovl_path_lower(struct dentry dentry, struct path path);
	199	enum ovl_path_type ovl_path_real(struct dentry dentry, struct path path);
	200	struct dentry ovl_dentry_upper(struct dentry dentry);
	201	struct dentry ovl_dentry_lower(struct dentry dentry);
	202	struct dentry ovl_dentry_real(struct dentry dentry);
e9be9d5e MS	203	struct ovl_dir_cache ovl_dir_cache(struct dentry dentry);
e9be9d5e MS	204	void ovl_set_dir_cache(struct dentry dentry, struct ovl_dir_cache cache);
e9be9d5e	205	bool ovl_dentry_is_opaque(struct dentry *dentry);
c412ce49	206	bool ovl_dentry_is_whiteout(struct dentry *dentry);
5cf5b477	207	void ovl_dentry_set_opaque(struct dentry *dentry);
a6c60655	208	bool ovl_redirect_dir(struct super_block *sb);
a6c60655 MS	209	const char ovl_dentry_get_redirect(struct dentry dentry);
a6c60655 MS	210	void ovl_dentry_set_redirect(struct dentry dentry, const char redirect);
e9be9d5e	211	void ovl_dentry_update(struct dentry dentry, struct dentry upperdentry);
bbb1e54d MS	212	void ovl_inode_init(struct inode inode, struct inode realinode,
bbb1e54d MS	213	bool is_upper);
39b681f8	214	void ovl_inode_update(struct inode inode, struct inode upperinode);
bbb1e54d MS	215	void ovl_dentry_version_inc(struct dentry *dentry);
	216	u64 ovl_dentry_version_get(struct dentry *dentry);
	217	bool ovl_is_whiteout(struct dentry *dentry);
e9be9d5e	218	struct file ovl_path_open(struct path path, int flags);
39d3d60a AG	219	int ovl_copy_up_start(struct dentry *dentry);
39d3d60a AG	220	void ovl_copy_up_end(struct dentry *dentry);
e9be9d5e	221
bbb1e54d MS	222	/* namei.c */
	223	int ovl_path_next(int idx, struct dentry dentry, struct path path);
	224	struct dentry ovl_lookup(struct inode dir, struct dentry *dentry, unsigned int flags);
	225	bool ovl_lower_positive(struct dentry *dentry);
e9be9d5e MS	226
	227	/* readdir.c */
	228	extern const struct file_operations ovl_dir_operations;
	229	int ovl_check_empty_dir(struct dentry dentry, struct list_head list);
	230	void ovl_cleanup_whiteouts(struct dentry upper, struct list_head list);
	231	void ovl_cache_free(struct list_head *list);
45aebeaf	232	int ovl_check_d_type_supported(struct path *realpath);
eea2fb48 MS	233	void ovl_workdir_cleanup(struct inode dir, struct vfsmount mnt,
eea2fb48 MS	234	struct dentry *dentry, int level);
e9be9d5e MS	235
	236	/* inode.c */
	237	int ovl_setattr(struct dentry dentry, struct iattr attr);
5b712091 MS	238	int ovl_getattr(const struct path path, struct kstat stat,
5b712091 MS	239	u32 request_mask, unsigned int flags);
e9be9d5e	240	int ovl_permission(struct inode *inode, int mask);
0e585ccc AG	241	int ovl_xattr_set(struct dentry dentry, const char name, const void *value,
0e585ccc AG	242	size_t size, int flags);
0eb45fc3 AG	243	int ovl_xattr_get(struct dentry dentry, const char name,
0eb45fc3 AG	244	void *value, size_t size);
e9be9d5e	245	ssize_t ovl_listxattr(struct dentry dentry, char list, size_t size);
39a25b2b	246	struct posix_acl ovl_get_acl(struct inode inode, int type);
2d902671	247	int ovl_open_maybe_copy_up(struct dentry *dentry, unsigned int file_flags);
d719e8f2	248	int ovl_update_time(struct inode inode, struct timespec ts, int flags);
0956254a	249	bool ovl_is_private_xattr(const char *name);
e9be9d5e	250
ca4c8a3a	251	struct inode ovl_new_inode(struct super_block sb, umode_t mode, dev_t rdev);
51f7e52d	252	struct inode ovl_get_inode(struct super_block sb, struct inode *realinode);
e9be9d5e MS	253	static inline void ovl_copyattr(struct inode from, struct inode to)
	254	{
	255	to->i_uid = from->i_uid;
	256	to->i_gid = from->i_gid;
07a2daab	257	to->i_mode = from->i_mode;
d719e8f2 MS	258	to->i_atime = from->i_atime;
	259	to->i_mtime = from->i_mtime;
	260	to->i_ctime = from->i_ctime;
e9be9d5e MS	261	}
	262
	263	/* dir.c */
	264	extern const struct inode_operations ovl_dir_inode_operations;
	265	struct dentry ovl_lookup_temp(struct dentry workdir, struct dentry *dentry);
32a3d848 AV	266	struct cattr {
	267	dev_t rdev;
	268	umode_t mode;
	269	const char *link;
	270	};
e9be9d5e	271	int ovl_create_real(struct inode dir, struct dentry newdentry,
32a3d848	272	struct cattr *attr,
e9be9d5e MS	273	struct dentry *hardlink, bool debug);
	274	void ovl_cleanup(struct inode dir, struct dentry dentry);
	275
	276	/* copy_up.c */
	277	int ovl_copy_up(struct dentry *dentry);
9aba6521	278	int ovl_copy_up_flags(struct dentry *dentry, int flags);
e9be9d5e MS	279	int ovl_copy_xattr(struct dentry old, struct dentry new);
e9be9d5e MS	280	int ovl_set_attr(struct dentry upper, struct kstat stat);
82b749b2 AG	281	int ovl_check_setxattr(struct dentry dentry, struct dentry upperdentry,
	282	const char name, const void value, size_t size,
	283	int xerr);