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