[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"

enum ovl_flag {
	OVL_IMPURE,
};

/*
 * 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_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_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);

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