[deliverable/linux.git] / include / linux / reiserfs_xattr.h

/*
  File: linux/reiserfs_xattr.h
*/

#ifndef _LINUX_REISERFS_XATTR_H
#define _LINUX_REISERFS_XATTR_H

#include <linux/types.h>

/* Magic value in header */
#define REISERFS_XATTR_MAGIC 0x52465841	/* "RFXA" */

struct reiserfs_xattr_header {
	__le32 h_magic;		/* magic number for identification */
	__le32 h_hash;		/* hash of the value */
};

struct reiserfs_security_handle {
	char *name;
	void *value;
	size_t length;
};

#ifdef __KERNEL__

#include <linux/init.h>
#include <linux/list.h>
#include <linux/rwsem.h>
#include <linux/reiserfs_fs_i.h>
#include <linux/reiserfs_fs.h>

struct inode;
struct dentry;
struct iattr;
struct super_block;
struct nameidata;

int reiserfs_xattr_register_handlers(void) __init;
void reiserfs_xattr_unregister_handlers(void);
int reiserfs_xattr_init(struct super_block *sb, int mount_flags);
int reiserfs_lookup_privroot(struct super_block *sb);
int reiserfs_delete_xattrs(struct inode *inode);
int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs);
int reiserfs_permission(struct inode *inode, int mask);

#ifdef CONFIG_REISERFS_FS_XATTR
#define has_xattr_dir(inode) (REISERFS_I(inode)->i_flags & i_has_xattr_dir)
ssize_t reiserfs_getxattr(struct dentry *dentry, const char *name,
			  void *buffer, size_t size);
int reiserfs_setxattr(struct dentry *dentry, const char *name,
		      const void *value, size_t size, int flags);
ssize_t reiserfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
int reiserfs_removexattr(struct dentry *dentry, const char *name);

int reiserfs_xattr_get(struct inode *, const char *, void *, size_t);
int reiserfs_xattr_set(struct inode *, const char *, const void *, size_t, int);
int reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *,
			      struct inode *, const char *, const void *,
			      size_t, int);

extern const struct xattr_handler reiserfs_xattr_user_handler;
extern const struct xattr_handler reiserfs_xattr_trusted_handler;
extern const struct xattr_handler reiserfs_xattr_security_handler;
#ifdef CONFIG_REISERFS_FS_SECURITY
int reiserfs_security_init(struct inode *dir, struct inode *inode,
			   const struct qstr *qstr,
			   struct reiserfs_security_handle *sec);
int reiserfs_security_write(struct reiserfs_transaction_handle *th,
			    struct inode *inode,
			    struct reiserfs_security_handle *sec);
void reiserfs_security_free(struct reiserfs_security_handle *sec);
#endif

static inline int reiserfs_xattrs_initialized(struct super_block *sb)
{
	return REISERFS_SB(sb)->priv_root != NULL;
}

#define xattr_size(size) ((size) + sizeof(struct reiserfs_xattr_header))
static inline loff_t reiserfs_xattr_nblocks(struct inode *inode, loff_t size)
{
	loff_t ret = 0;
	if (reiserfs_file_data_log(inode)) {
		ret = _ROUND_UP(xattr_size(size), inode->i_sb->s_blocksize);
		ret >>= inode->i_sb->s_blocksize_bits;
	}
	return ret;
}

/* We may have to create up to 3 objects: xattr root, xattr dir, xattr file.
 * Let's try to be smart about it.
 * xattr root: We cache it. If it's not cached, we may need to create it.
 * xattr dir: If anything has been loaded for this inode, we can set a flag
 *            saying so.
 * xattr file: Since we don't cache xattrs, we can't tell. We always include
 *             blocks for it.
 *
 * However, since root and dir can be created between calls - YOU MUST SAVE
 * THIS VALUE.
 */
static inline size_t reiserfs_xattr_jcreate_nblocks(struct inode *inode)
{
	size_t nblocks = JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);

	if ((REISERFS_I(inode)->i_flags & i_has_xattr_dir) == 0) {
		nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
		if (!REISERFS_SB(inode->i_sb)->xattr_root->d_inode)
			nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
	}

	return nblocks;
}

static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
{
	init_rwsem(&REISERFS_I(inode)->i_xattr_sem);
}

#else

#define reiserfs_getxattr NULL
#define reiserfs_setxattr NULL
#define reiserfs_listxattr NULL
#define reiserfs_removexattr NULL

static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
{
}
#endif  /*  CONFIG_REISERFS_FS_XATTR  */

#ifndef CONFIG_REISERFS_FS_SECURITY
static inline int reiserfs_security_init(struct inode *dir,
					 struct inode *inode,
					 const struct qstr *qstr,
					 struct reiserfs_security_handle *sec)
{
	return 0;
}
static inline int
reiserfs_security_write(struct reiserfs_transaction_handle *th,
			struct inode *inode,
			struct reiserfs_security_handle *sec)
{
	return 0;
}
static inline void reiserfs_security_free(struct reiserfs_security_handle *sec)
{}
#endif

#endif  /*  __KERNEL__  */

#endif  /*  _LINUX_REISERFS_XATTR_H  */
Commit	Line	Data
1da177e4 LT	1	/*
	2	File: linux/reiserfs_xattr.h
	3	*/
	4
521dae19 AB	5	#ifndef _LINUX_REISERFS_XATTR_H
	6	#define _LINUX_REISERFS_XATTR_H
	7
	8	#include <linux/types.h>
1da177e4 LT	9
1da177e4 LT	10	/* Magic value in header */
bd4c625c	11	#define REISERFS_XATTR_MAGIC 0x52465841 /* "RFXA" */
1da177e4 LT	12
1da177e4 LT	13	struct reiserfs_xattr_header {
bd4c625c LT	14	__le32 h_magic; /* magic number for identification */
bd4c625c LT	15	__le32 h_hash; /* hash of the value */
1da177e4 LT	16	};
1da177e4 LT	17
57fe60df JM	18	struct reiserfs_security_handle {
	19	char *name;
	20	void *value;
	21	size_t length;
	22	};
	23
1da177e4	24	#ifdef __KERNEL__
521dae19	25
98ca79d5	26	#include <linux/init.h>
521dae19 AB	27	#include <linux/list.h>
	28	#include <linux/rwsem.h>
	29	#include <linux/reiserfs_fs_i.h>
	30	#include <linux/reiserfs_fs.h>
	31
	32	struct inode;
	33	struct dentry;
	34	struct iattr;
	35	struct super_block;
	36	struct nameidata;
1da177e4	37
a72bdb1c JM	38	int reiserfs_xattr_register_handlers(void) __init;
	39	void reiserfs_xattr_unregister_handlers(void);
	40	int reiserfs_xattr_init(struct super_block *sb, int mount_flags);
edcc37a0	41	int reiserfs_lookup_privroot(struct super_block *sb);
a72bdb1c JM	42	int reiserfs_delete_xattrs(struct inode *inode);
a72bdb1c JM	43	int reiserfs_chown_xattrs(struct inode inode, struct iattr attrs);
10556cb2	44	int reiserfs_permission(struct inode *inode, int mask);
a72bdb1c	45
1da177e4	46	#ifdef CONFIG_REISERFS_FS_XATTR
1da177e4	47	#define has_xattr_dir(inode) (REISERFS_I(inode)->i_flags & i_has_xattr_dir)
bd4c625c LT	48	ssize_t reiserfs_getxattr(struct dentry dentry, const char name,
	49	void *buffer, size_t size);
	50	int reiserfs_setxattr(struct dentry dentry, const char name,
	51	const void *value, size_t size, int flags);
	52	ssize_t reiserfs_listxattr(struct dentry dentry, char buffer, size_t size);
	53	int reiserfs_removexattr(struct dentry dentry, const char name);
bd4c625c	54
48b32a35	55	int reiserfs_xattr_get(struct inode , const char , void *, size_t);
bd4c625c	56	int reiserfs_xattr_set(struct inode , const char , const void *, size_t, int);
0ab2621e JM	57	int reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *,
	58	struct inode , const char , const void *,
	59	size_t, int);
1da177e4	60
94d09a98 SH	61	extern const struct xattr_handler reiserfs_xattr_user_handler;
	62	extern const struct xattr_handler reiserfs_xattr_trusted_handler;
	63	extern const struct xattr_handler reiserfs_xattr_security_handler;
57fe60df JM	64	#ifdef CONFIG_REISERFS_FS_SECURITY
57fe60df JM	65	int reiserfs_security_init(struct inode dir, struct inode inode,
2a7dba39	66	const struct qstr *qstr,
57fe60df JM	67	struct reiserfs_security_handle *sec);
	68	int reiserfs_security_write(struct reiserfs_transaction_handle *th,
	69	struct inode *inode,
	70	struct reiserfs_security_handle *sec);
	71	void reiserfs_security_free(struct reiserfs_security_handle *sec);
	72	#endif
1da177e4	73
6cb4aff0 JM	74	static inline int reiserfs_xattrs_initialized(struct super_block *sb)
	75	{
	76	return REISERFS_SB(sb)->priv_root != NULL;
	77	}
	78
0ab2621e JM	79	#define xattr_size(size) ((size) + sizeof(struct reiserfs_xattr_header))
	80	static inline loff_t reiserfs_xattr_nblocks(struct inode *inode, loff_t size)
	81	{
	82	loff_t ret = 0;
	83	if (reiserfs_file_data_log(inode)) {
	84	ret = _ROUND_UP(xattr_size(size), inode->i_sb->s_blocksize);
	85	ret >>= inode->i_sb->s_blocksize_bits;
	86	}
	87	return ret;
	88	}
	89
	90	/* We may have to create up to 3 objects: xattr root, xattr dir, xattr file.
	91	* Let's try to be smart about it.
	92	* xattr root: We cache it. If it's not cached, we may need to create it.
	93	* xattr dir: If anything has been loaded for this inode, we can set a flag
	94	* saying so.
	95	* xattr file: Since we don't cache xattrs, we can't tell. We always include
	96	* blocks for it.
	97	*
	98	* However, since root and dir can be created between calls - YOU MUST SAVE
	99	* THIS VALUE.
	100	*/
	101	static inline size_t reiserfs_xattr_jcreate_nblocks(struct inode *inode)
	102	{
	103	size_t nblocks = JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
	104
	105	if ((REISERFS_I(inode)->i_flags & i_has_xattr_dir) == 0) {
	106	nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
ab17c4f0	107	if (!REISERFS_SB(inode->i_sb)->xattr_root->d_inode)
0ab2621e JM	108	nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb);
	109	}
	110
	111	return nblocks;
	112	}
	113
068fbb31 AD	114	static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
068fbb31 AD	115	{
d984561b	116	init_rwsem(&REISERFS_I(inode)->i_xattr_sem);
068fbb31 AD	117	}
068fbb31 AD	118
1da177e4 LT	119	#else
1da177e4 LT	120
1da177e4 LT	121	#define reiserfs_getxattr NULL
	122	#define reiserfs_setxattr NULL
	123	#define reiserfs_listxattr NULL
	124	#define reiserfs_removexattr NULL
1da177e4	125
068fbb31 AD	126	static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
	127	{
	128	}
521dae19 AB	129	#endif /* CONFIG_REISERFS_FS_XATTR */
521dae19 AB	130
57fe60df JM	131	#ifndef CONFIG_REISERFS_FS_SECURITY
	132	static inline int reiserfs_security_init(struct inode *dir,
	133	struct inode *inode,
2a7dba39	134	const struct qstr *qstr,
57fe60df JM	135	struct reiserfs_security_handle *sec)
	136	{
	137	return 0;
	138	}
	139	static inline int
	140	reiserfs_security_write(struct reiserfs_transaction_handle *th,
	141	struct inode *inode,
	142	struct reiserfs_security_handle *sec)
	143	{
	144	return 0;
	145	}
	146	static inline void reiserfs_security_free(struct reiserfs_security_handle *sec)
	147	{}
	148	#endif
	149
521dae19	150	#endif /* __KERNEL__ */
1da177e4	151
521dae19	152	#endif /* _LINUX_REISERFS_XATTR_H */