[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"
#define OVL_XATTR_IMPURE OVL_XATTR_PREFIX "impure"
#define OVL_XATTR_NLINK OVL_XATTR_PREFIX "nlink"

enum ovl_flag {
	OVL_IMPURE,
	OVL_INDEX,
};

/*
 * 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)
/* Is the real inode encoded in fid an upper inode? */
#define OVL_FH_FLAG_PATH_UPPER	(1 << 2)

#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_t uuid;	/* uuid of filesystem */
	u8 fid[0];	/* file identifier */
} __packed;

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;
}

/* 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);
bool ovl_can_decode_fh(struct super_block *sb);
struct dentry *ovl_indexdir(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 inode *ovl_inode_upper(struct inode *inode);
struct inode *ovl_inode_lower(struct inode *inode);
struct inode *ovl_inode_real(struct inode *inode);
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_dentry_has_upper_alias(struct dentry *dentry);
void ovl_dentry_set_upper_alias(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_inode_init(struct inode *inode, struct dentry *upperdentry,
		    struct dentry *lowerdentry);
void ovl_inode_update(struct inode *inode, struct dentry *upperdentry);
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);
bool ovl_check_dir_xattr(struct dentry *dentry, const char *name);
int ovl_check_setxattr(struct dentry *dentry, struct dentry *upperdentry,
		       const char *name, const void *value, size_t size,
		       int xerr);
int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry);
void ovl_set_flag(unsigned long flag, struct inode *inode);
bool ovl_test_flag(unsigned long flag, struct inode *inode);
bool ovl_inuse_trylock(struct dentry *dentry);
void ovl_inuse_unlock(struct dentry *dentry);
int ovl_nlink_start(struct dentry *dentry, bool *locked);
void ovl_nlink_end(struct dentry *dentry, bool locked);

static inline bool ovl_is_impuredir(struct dentry *dentry)
{
	return ovl_check_dir_xattr(dentry, OVL_XATTR_IMPURE);
}


/* namei.c */
int ovl_verify_origin(struct dentry *dentry, struct vfsmount *mnt,
		      struct dentry *origin, bool is_upper, bool set);
int ovl_verify_index(struct dentry *index, struct path *lowerstack,
		     unsigned int numlower);
int ovl_get_index_name(struct dentry *origin, struct qstr *name);
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);
int ovl_indexdir_cleanup(struct dentry *dentry, struct vfsmount *mnt,
			 struct path *lowerstack, unsigned int numlower);

/* inode.c */
int ovl_set_nlink_upper(struct dentry *dentry);
int ovl_set_nlink_lower(struct dentry *dentry);
unsigned int ovl_get_nlink(struct dentry *lowerdentry,
			   struct dentry *upperdentry,
			   unsigned int fallback);
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 dentry *dentry, struct dentry *upperdentry);
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 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);
int 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);
struct ovl_fh *ovl_encode_fh(struct dentry *lower, bool is_upper);
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	26	#define OVL_XATTR_ORIGIN OVL_XATTR_PREFIX "origin"
ee1d6d37	27	#define OVL_XATTR_IMPURE OVL_XATTR_PREFIX "impure"
5f8415d6	28	#define OVL_XATTR_NLINK OVL_XATTR_PREFIX "nlink"
3a1e819b	29
13c72075 MS	30	enum ovl_flag {
13c72075 MS	31	OVL_IMPURE,
359f392c	32	OVL_INDEX,
13c72075 MS	33	};
13c72075 MS	34
3a1e819b AG	35	/*
	36	* The tuple (fh,uuid) is a universal unique identifier for a copy up origin,
	37	* where:
	38	* origin.fh - exported file handle of the lower file
	39	* origin.uuid - uuid of the lower filesystem
	40	*/
	41	#define OVL_FH_VERSION 0
	42	#define OVL_FH_MAGIC 0xfb
	43
	44	/* CPU byte order required for fid decoding: */
	45	#define OVL_FH_FLAG_BIG_ENDIAN (1 << 0)
	46	#define OVL_FH_FLAG_ANY_ENDIAN (1 << 1)
54fb347e AG	47	/* Is the real inode encoded in fid an upper inode? */
54fb347e AG	48	#define OVL_FH_FLAG_PATH_UPPER (1 << 2)
3a1e819b AG	49
	50	#define OVL_FH_FLAG_ALL (OVL_FH_FLAG_BIG_ENDIAN \| OVL_FH_FLAG_ANY_ENDIAN)
	51
	52	#if defined(__LITTLE_ENDIAN)
	53	#define OVL_FH_FLAG_CPU_ENDIAN 0
	54	#elif defined(__BIG_ENDIAN)
	55	#define OVL_FH_FLAG_CPU_ENDIAN OVL_FH_FLAG_BIG_ENDIAN
	56	#else
	57	#error Endianness not defined
	58	#endif
	59
	60	/* On-disk and in-memeory format for redirect by file handle */
	61	struct ovl_fh {
	62	u8 version; /* 0 */
	63	u8 magic; /* 0xfb */
	64	u8 len; /* size of this header + size of fid */
	65	u8 flags; /* OVL_FH_FLAG_* */
	66	u8 type; /* fid_type of fid */
01633fd2	67	uuid_t uuid; /* uuid of filesystem */
3a1e819b AG	68	u8 fid[0]; /* file identifier */
3a1e819b AG	69	} __packed;
e9be9d5e MS	70
	71	static inline int ovl_do_rmdir(struct inode dir, struct dentry dentry)
	72	{
	73	int err = vfs_rmdir(dir, dentry);
	74	pr_debug("rmdir(%pd2) = %i\n", dentry, err);
	75	return err;
	76	}
	77
	78	static inline int ovl_do_unlink(struct inode dir, struct dentry dentry)
	79	{
	80	int err = vfs_unlink(dir, dentry, NULL);
	81	pr_debug("unlink(%pd2) = %i\n", dentry, err);
	82	return err;
	83	}
	84
	85	static inline int ovl_do_link(struct dentry old_dentry, struct inode dir,
	86	struct dentry *new_dentry, bool debug)
	87	{
	88	int err = vfs_link(old_dentry, dir, new_dentry, NULL);
	89	if (debug) {
	90	pr_debug("link(%pd2, %pd2) = %i\n",
	91	old_dentry, new_dentry, err);
	92	}
	93	return err;
	94	}
	95
	96	static inline int ovl_do_create(struct inode dir, struct dentry dentry,
	97	umode_t mode, bool debug)
	98	{
	99	int err = vfs_create(dir, dentry, mode, true);
	100	if (debug)
	101	pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err);
	102	return err;
	103	}
	104
	105	static inline int ovl_do_mkdir(struct inode dir, struct dentry dentry,
	106	umode_t mode, bool debug)
	107	{
	108	int err = vfs_mkdir(dir, dentry, mode);
	109	if (debug)
	110	pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err);
	111	return err;
	112	}
	113
	114	static inline int ovl_do_mknod(struct inode dir, struct dentry dentry,
	115	umode_t mode, dev_t dev, bool debug)
	116	{
	117	int err = vfs_mknod(dir, dentry, mode, dev);
	118	if (debug) {
	119	pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n",
	120	dentry, mode, dev, err);
	121	}
	122	return err;
	123	}
	124
	125	static inline int ovl_do_symlink(struct inode dir, struct dentry dentry,
	126	const char *oldname, bool debug)
	127	{
	128	int err = vfs_symlink(dir, dentry, oldname);
	129	if (debug)
	130	pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err);
	131	return err;
	132	}
	133
134	static inline int ovl_do_setxattr(struct dentry dentry, const char name,
135	const void *value, size_t size, int flags)
136	{
137	int err = vfs_setxattr(dentry, name, value, size, flags);
138	pr_debug("setxattr(%pd2, \"%s\", \"%*s\", 0x%x) = %i\n",
139	dentry, name, (int) size, (char *) value, flags, err);
140	return err;
141	}
142
143	static inline int ovl_do_removexattr(struct dentry dentry, const char name)
144	{
145	int err = vfs_removexattr(dentry, name);
146	pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err);
147	return err;
148	}
149
150	static inline int ovl_do_rename(struct inode olddir, struct dentry olddentry,
151	struct inode newdir, struct dentry newdentry,
152	unsigned int flags)
153	{
154	int err;
155
2773bf00	156	pr_debug("rename(%pd2, %pd2, 0x%x)\n",
e9be9d5e MS	157	olddentry, newdentry, flags);
	158
	159	err = vfs_rename(olddir, olddentry, newdir, newdentry, NULL, flags);
	160
	161	if (err) {
2773bf00	162	pr_debug("...rename(%pd2, %pd2, ...) = %i\n",
e9be9d5e MS	163	olddentry, newdentry, err);
	164	}
	165	return err;
	166	}
	167
	168	static inline int ovl_do_whiteout(struct inode dir, struct dentry dentry)
	169	{
	170	int err = vfs_whiteout(dir, dentry);
	171	pr_debug("whiteout(%pd2) = %i\n", dentry, err);
	172	return err;
	173	}
	174
e7f52429 AG	175	static inline struct dentry ovl_do_tmpfile(struct dentry dentry, umode_t mode)
	176	{
	177	struct dentry *ret = vfs_tmpfile(dentry, mode, 0);
	178	int err = IS_ERR(ret) ? PTR_ERR(ret) : 0;
	179
	180	pr_debug("tmpfile(%pd2, 0%o) = %i\n", dentry, mode, err);
	181	return ret;
	182	}
	183
bbb1e54d MS	184	/* util.c */
	185	int ovl_want_write(struct dentry *dentry);
	186	void ovl_drop_write(struct dentry *dentry);
	187	struct dentry ovl_workdir(struct dentry dentry);
	188	const struct cred ovl_override_creds(struct super_block sb);
7bcd74b9	189	struct super_block ovl_same_sb(struct super_block sb);
02bcd157 AG	190	bool ovl_can_decode_fh(struct super_block *sb);
02bcd157 AG	191	struct dentry ovl_indexdir(struct super_block sb);
bbb1e54d MS	192	struct ovl_entry *ovl_alloc_entry(unsigned int numlower);
	193	bool ovl_dentry_remote(struct dentry *dentry);
	194	bool ovl_dentry_weird(struct dentry *dentry);
e9be9d5e	195	enum ovl_path_type ovl_path_type(struct dentry *dentry);
e9be9d5e MS	196	void ovl_path_upper(struct dentry dentry, struct path path);
	197	void ovl_path_lower(struct dentry dentry, struct path path);
	198	enum ovl_path_type ovl_path_real(struct dentry dentry, struct path path);
	199	struct dentry ovl_dentry_upper(struct dentry dentry);
	200	struct dentry ovl_dentry_lower(struct dentry dentry);
	201	struct dentry ovl_dentry_real(struct dentry dentry);
09d8b586 MS	202	struct inode ovl_inode_upper(struct inode inode);
	203	struct inode ovl_inode_lower(struct inode inode);
	204	struct inode ovl_inode_real(struct inode inode);
e9be9d5e MS	205	struct ovl_dir_cache ovl_dir_cache(struct dentry dentry);
e9be9d5e MS	206	void ovl_set_dir_cache(struct dentry dentry, struct ovl_dir_cache cache);
e9be9d5e	207	bool ovl_dentry_is_opaque(struct dentry *dentry);
c412ce49	208	bool ovl_dentry_is_whiteout(struct dentry *dentry);
5cf5b477	209	void ovl_dentry_set_opaque(struct dentry *dentry);
55acc661 MS	210	bool ovl_dentry_has_upper_alias(struct dentry *dentry);
55acc661 MS	211	void ovl_dentry_set_upper_alias(struct dentry *dentry);
a6c60655	212	bool ovl_redirect_dir(struct super_block *sb);
a6c60655 MS	213	const char ovl_dentry_get_redirect(struct dentry dentry);
a6c60655 MS	214	void ovl_dentry_set_redirect(struct dentry dentry, const char redirect);
09d8b586 MS	215	void ovl_inode_init(struct inode inode, struct dentry upperdentry,
	216	struct dentry *lowerdentry);
	217	void ovl_inode_update(struct inode inode, struct dentry upperdentry);
bbb1e54d MS	218	void ovl_dentry_version_inc(struct dentry *dentry);
	219	u64 ovl_dentry_version_get(struct dentry *dentry);
	220	bool ovl_is_whiteout(struct dentry *dentry);
e9be9d5e	221	struct file ovl_path_open(struct path path, int flags);
39d3d60a AG	222	int ovl_copy_up_start(struct dentry *dentry);
39d3d60a AG	223	void ovl_copy_up_end(struct dentry *dentry);
f3a15685 AG	224	bool ovl_check_dir_xattr(struct dentry dentry, const char name);
	225	int ovl_check_setxattr(struct dentry dentry, struct dentry upperdentry,
	226	const char name, const void value, size_t size,
	227	int xerr);
	228	int ovl_set_impure(struct dentry dentry, struct dentry upperdentry);
13c72075 MS	229	void ovl_set_flag(unsigned long flag, struct inode *inode);
13c72075 MS	230	bool ovl_test_flag(unsigned long flag, struct inode *inode);
ad0af710 AG	231	bool ovl_inuse_trylock(struct dentry *dentry);
ad0af710 AG	232	void ovl_inuse_unlock(struct dentry *dentry);
5f8415d6 AG	233	int ovl_nlink_start(struct dentry dentry, bool locked);
5f8415d6 AG	234	void ovl_nlink_end(struct dentry *dentry, bool locked);
f3a15685 AG	235
	236	static inline bool ovl_is_impuredir(struct dentry *dentry)
	237	{
	238	return ovl_check_dir_xattr(dentry, OVL_XATTR_IMPURE);
	239	}
	240
e9be9d5e	241
bbb1e54d	242	/* namei.c */
8b88a2e6	243	int ovl_verify_origin(struct dentry dentry, struct vfsmount mnt,
54fb347e	244	struct dentry *origin, bool is_upper, bool set);
415543d5 AG	245	int ovl_verify_index(struct dentry index, struct path lowerstack,
415543d5 AG	246	unsigned int numlower);
359f392c	247	int ovl_get_index_name(struct dentry origin, struct qstr name);
bbb1e54d MS	248	int ovl_path_next(int idx, struct dentry dentry, struct path path);
	249	struct dentry ovl_lookup(struct inode dir, struct dentry *dentry, unsigned int flags);
	250	bool ovl_lower_positive(struct dentry *dentry);
e9be9d5e MS	251
	252	/* readdir.c */
	253	extern const struct file_operations ovl_dir_operations;
	254	int ovl_check_empty_dir(struct dentry dentry, struct list_head list);
	255	void ovl_cleanup_whiteouts(struct dentry upper, struct list_head list);
	256	void ovl_cache_free(struct list_head *list);
45aebeaf	257	int ovl_check_d_type_supported(struct path *realpath);
eea2fb48 MS	258	void ovl_workdir_cleanup(struct inode dir, struct vfsmount mnt,
eea2fb48 MS	259	struct dentry *dentry, int level);
415543d5 AG	260	int ovl_indexdir_cleanup(struct dentry dentry, struct vfsmount mnt,
415543d5 AG	261	struct path *lowerstack, unsigned int numlower);
e9be9d5e MS	262
e9be9d5e MS	263	/* inode.c */
5f8415d6 AG	264	int ovl_set_nlink_upper(struct dentry *dentry);
5f8415d6 AG	265	int ovl_set_nlink_lower(struct dentry *dentry);
caf70cb2 AG	266	unsigned int ovl_get_nlink(struct dentry *lowerdentry,
	267	struct dentry *upperdentry,
	268	unsigned int fallback);
e9be9d5e	269	int ovl_setattr(struct dentry dentry, struct iattr attr);
5b712091 MS	270	int ovl_getattr(const struct path path, struct kstat stat,
5b712091 MS	271	u32 request_mask, unsigned int flags);
e9be9d5e	272	int ovl_permission(struct inode *inode, int mask);
0e585ccc AG	273	int ovl_xattr_set(struct dentry dentry, const char name, const void *value,
0e585ccc AG	274	size_t size, int flags);
0eb45fc3 AG	275	int ovl_xattr_get(struct dentry dentry, const char name,
0eb45fc3 AG	276	void *value, size_t size);
e9be9d5e	277	ssize_t ovl_listxattr(struct dentry dentry, char list, size_t size);
39a25b2b	278	struct posix_acl ovl_get_acl(struct inode inode, int type);
2d902671	279	int ovl_open_maybe_copy_up(struct dentry *dentry, unsigned int file_flags);
d719e8f2	280	int ovl_update_time(struct inode inode, struct timespec ts, int flags);
0956254a	281	bool ovl_is_private_xattr(const char *name);
e9be9d5e	282
ca4c8a3a	283	struct inode ovl_new_inode(struct super_block sb, umode_t mode, dev_t rdev);
09d8b586	284	struct inode ovl_get_inode(struct dentry dentry, struct dentry *upperdentry);
e9be9d5e MS	285	static inline void ovl_copyattr(struct inode from, struct inode to)
	286	{
	287	to->i_uid = from->i_uid;
	288	to->i_gid = from->i_gid;
07a2daab	289	to->i_mode = from->i_mode;
d719e8f2 MS	290	to->i_atime = from->i_atime;
	291	to->i_mtime = from->i_mtime;
	292	to->i_ctime = from->i_ctime;
e9be9d5e MS	293	}
	294
	295	/* dir.c */
	296	extern const struct inode_operations ovl_dir_inode_operations;
3d27573c	297	struct dentry ovl_lookup_temp(struct dentry workdir);
32a3d848 AV	298	struct cattr {
	299	dev_t rdev;
	300	umode_t mode;
	301	const char *link;
	302	};
e9be9d5e	303	int ovl_create_real(struct inode dir, struct dentry newdentry,
32a3d848	304	struct cattr *attr,
e9be9d5e	305	struct dentry *hardlink, bool debug);
415543d5	306	int ovl_cleanup(struct inode dir, struct dentry dentry);
e9be9d5e MS	307
	308	/* copy_up.c */
	309	int ovl_copy_up(struct dentry *dentry);
9aba6521	310	int ovl_copy_up_flags(struct dentry *dentry, int flags);
e9be9d5e MS	311	int ovl_copy_xattr(struct dentry old, struct dentry new);
e9be9d5e MS	312	int ovl_set_attr(struct dentry upper, struct kstat stat);
54fb347e	313	struct ovl_fh ovl_encode_fh(struct dentry lower, bool is_upper);