mirror of
https://github.com/wiidev/usbloadergx.git
synced 2024-11-16 00:15:08 +01:00
72 lines
2.5 KiB
C
72 lines
2.5 KiB
C
|
/*
|
||
|
|
File: linux/ext2_ext_attr.h
|
||
|
|
|
||
|
|
On-disk format of extended attributes for the ext2 filesystem.
|
||
|
|
|
||
|
|
(C) 2000 Andreas Gruenbacher, <a.gruenbacher@computer.org>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef _EXT2_EXT_ATTR_H
|
||
|
|
#define _EXT2_EXT_ATTR_H
|
||
|
|
/* Magic value in attribute blocks */
|
||
|
|
#define EXT2_EXT_ATTR_MAGIC_v1 0xEA010000
|
||
|
|
#define EXT2_EXT_ATTR_MAGIC 0xEA020000
|
||
|
|
|
||
|
|
/* Maximum number of references to one attribute block */
|
||
|
|
#define EXT2_EXT_ATTR_REFCOUNT_MAX 1024
|
||
|
|
|
||
|
|
struct ext2_ext_attr_header {
|
||
|
|
__u32 h_magic; /* magic number for identification */
|
||
|
|
__u32 h_refcount; /* reference count */
|
||
|
|
__u32 h_blocks; /* number of disk blocks used */
|
||
|
|
__u32 h_hash; /* hash value of all attributes */
|
||
|
|
__u32 h_reserved[4]; /* zero right now */
|
||
|
|
};
|
||
|
|
|
||
|
|
struct ext2_ext_attr_entry {
|
||
|
|
__u8 e_name_len; /* length of name */
|
||
|
|
__u8 e_name_index; /* attribute name index */
|
||
|
|
__u16 e_value_offs; /* offset in disk block of value */
|
||
|
|
__u32 e_value_block; /* disk block attribute is stored on (n/i) */
|
||
|
|
__u32 e_value_size; /* size of attribute value */
|
||
|
|
__u32 e_hash; /* hash value of name and value */
|
||
|
|
#if 0
|
||
|
|
char e_name[0]; /* attribute name */
|
||
|
|
#endif
|
||
|
|
};
|
||
|
|
|
||
|
|
#define EXT2_EXT_ATTR_PAD_BITS 2
|
||
|
|
#define EXT2_EXT_ATTR_PAD ((unsigned) 1<<EXT2_EXT_ATTR_PAD_BITS)
|
||
|
|
#define EXT2_EXT_ATTR_ROUND (EXT2_EXT_ATTR_PAD-1)
|
||
|
|
#define EXT2_EXT_ATTR_LEN(name_len) \
|
||
|
|
(((name_len) + EXT2_EXT_ATTR_ROUND + \
|
||
|
|
sizeof(struct ext2_ext_attr_entry)) & ~EXT2_EXT_ATTR_ROUND)
|
||
|
|
#define EXT2_EXT_ATTR_NEXT(entry) \
|
||
|
|
( (struct ext2_ext_attr_entry *)( \
|
||
|
|
(char *)(entry) + EXT2_EXT_ATTR_LEN((entry)->e_name_len)) )
|
||
|
|
#define EXT2_EXT_ATTR_SIZE(size) \
|
||
|
|
(((size) + EXT2_EXT_ATTR_ROUND) & ~EXT2_EXT_ATTR_ROUND)
|
||
|
|
#define EXT2_EXT_IS_LAST_ENTRY(entry) (*((__u32 *)(entry)) == 0UL)
|
||
|
|
#define EXT2_EXT_ATTR_NAME(entry) \
|
||
|
|
(((char *) (entry)) + sizeof(struct ext2_ext_attr_entry))
|
||
|
|
#define EXT2_XATTR_LEN(name_len) \
|
||
|
|
(((name_len) + EXT2_EXT_ATTR_ROUND + \
|
||
|
|
sizeof(struct ext2_xattr_entry)) & ~EXT2_EXT_ATTR_ROUND)
|
||
|
|
#define EXT2_XATTR_SIZE(size) \
|
||
|
|
(((size) + EXT2_EXT_ATTR_ROUND) & ~EXT2_EXT_ATTR_ROUND)
|
||
|
|
|
||
|
|
#ifdef __KERNEL__
|
||
|
|
# ifdef CONFIG_EXT2_FS_EXT_ATTR
|
||
|
|
extern int ext2_get_ext_attr(struct inode *, const char *, char *, size_t, int);
|
||
|
|
extern int ext2_set_ext_attr(struct inode *, const char *, char *, size_t, int);
|
||
|
|
extern void ext2_ext_attr_free_inode(struct inode *inode);
|
||
|
|
extern void ext2_ext_attr_put_super(struct super_block *sb);
|
||
|
|
extern int ext2_ext_attr_init(void);
|
||
|
|
extern void ext2_ext_attr_done(void);
|
||
|
|
# else
|
||
|
|
# define ext2_get_ext_attr NULL
|
||
|
|
# define ext2_set_ext_attr NULL
|
||
|
|
# endif
|
||
|
|
#endif /* __KERNEL__ */
|
||
|
|
#endif /* _EXT2_EXT_ATTR_H */
|