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/fs/ext2/xattr.h

https://bitbucket.org/cyanogenmod/android_kernel_asus_tf300t
C Header | 127 lines | 93 code | 24 blank | 10 comment | 1 complexity | 9bb8368fc6071372cce49a7807ddfda8 MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
  1/*
  2  File: linux/ext2_xattr.h
  3
  4  On-disk format of extended attributes for the ext2 filesystem.
  5
  6  (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
  7*/
  8
  9#include <linux/init.h>
 10#include <linux/xattr.h>
 11
 12/* Magic value in attribute blocks */
 13#define EXT2_XATTR_MAGIC		0xEA020000
 14
 15/* Maximum number of references to one attribute block */
 16#define EXT2_XATTR_REFCOUNT_MAX		1024
 17
 18/* Name indexes */
 19#define EXT2_XATTR_INDEX_USER			1
 20#define EXT2_XATTR_INDEX_POSIX_ACL_ACCESS	2
 21#define EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT	3
 22#define EXT2_XATTR_INDEX_TRUSTED		4
 23#define	EXT2_XATTR_INDEX_LUSTRE			5
 24#define EXT2_XATTR_INDEX_SECURITY	        6
 25
 26struct ext2_xattr_header {
 27	__le32	h_magic;	/* magic number for identification */
 28	__le32	h_refcount;	/* reference count */
 29	__le32	h_blocks;	/* number of disk blocks used */
 30	__le32	h_hash;		/* hash value of all attributes */
 31	__u32	h_reserved[4];	/* zero right now */
 32};
 33
 34struct ext2_xattr_entry {
 35	__u8	e_name_len;	/* length of name */
 36	__u8	e_name_index;	/* attribute name index */
 37	__le16	e_value_offs;	/* offset in disk block of value */
 38	__le32	e_value_block;	/* disk block attribute is stored on (n/i) */
 39	__le32	e_value_size;	/* size of attribute value */
 40	__le32	e_hash;		/* hash value of name and value */
 41	char	e_name[0];	/* attribute name */
 42};
 43
 44#define EXT2_XATTR_PAD_BITS		2
 45#define EXT2_XATTR_PAD		(1<<EXT2_XATTR_PAD_BITS)
 46#define EXT2_XATTR_ROUND		(EXT2_XATTR_PAD-1)
 47#define EXT2_XATTR_LEN(name_len) \
 48	(((name_len) + EXT2_XATTR_ROUND + \
 49	sizeof(struct ext2_xattr_entry)) & ~EXT2_XATTR_ROUND)
 50#define EXT2_XATTR_NEXT(entry) \
 51	( (struct ext2_xattr_entry *)( \
 52	  (char *)(entry) + EXT2_XATTR_LEN((entry)->e_name_len)) )
 53#define EXT2_XATTR_SIZE(size) \
 54	(((size) + EXT2_XATTR_ROUND) & ~EXT2_XATTR_ROUND)
 55
 56# ifdef CONFIG_EXT2_FS_XATTR
 57
 58extern const struct xattr_handler ext2_xattr_user_handler;
 59extern const struct xattr_handler ext2_xattr_trusted_handler;
 60extern const struct xattr_handler ext2_xattr_acl_access_handler;
 61extern const struct xattr_handler ext2_xattr_acl_default_handler;
 62extern const struct xattr_handler ext2_xattr_security_handler;
 63
 64extern ssize_t ext2_listxattr(struct dentry *, char *, size_t);
 65
 66extern int ext2_xattr_get(struct inode *, int, const char *, void *, size_t);
 67extern int ext2_xattr_set(struct inode *, int, const char *, const void *, size_t, int);
 68
 69extern void ext2_xattr_delete_inode(struct inode *);
 70extern void ext2_xattr_put_super(struct super_block *);
 71
 72extern int init_ext2_xattr(void);
 73extern void exit_ext2_xattr(void);
 74
 75extern const struct xattr_handler *ext2_xattr_handlers[];
 76
 77# else  /* CONFIG_EXT2_FS_XATTR */
 78
 79static inline int
 80ext2_xattr_get(struct inode *inode, int name_index,
 81	       const char *name, void *buffer, size_t size)
 82{
 83	return -EOPNOTSUPP;
 84}
 85
 86static inline int
 87ext2_xattr_set(struct inode *inode, int name_index, const char *name,
 88	       const void *value, size_t size, int flags)
 89{
 90	return -EOPNOTSUPP;
 91}
 92
 93static inline void
 94ext2_xattr_delete_inode(struct inode *inode)
 95{
 96}
 97
 98static inline void
 99ext2_xattr_put_super(struct super_block *sb)
100{
101}
102
103static inline int
104init_ext2_xattr(void)
105{
106	return 0;
107}
108
109static inline void
110exit_ext2_xattr(void)
111{
112}
113
114#define ext2_xattr_handlers NULL
115
116# endif  /* CONFIG_EXT2_FS_XATTR */
117
118#ifdef CONFIG_EXT2_FS_SECURITY
119extern int ext2_init_security(struct inode *inode, struct inode *dir,
120			      const struct qstr *qstr);
121#else
122static inline int ext2_init_security(struct inode *inode, struct inode *dir,
123				     const struct qstr *qstr)
124{
125	return 0;
126}
127#endif