Release 4.10 fs/ext4/xattr.h

/*
  File: fs/ext4/xattr.h

  On-disk format of extended attributes for the ext4 filesystem.

  (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
*/

#include <linux/xattr.h>

/* Magic value in attribute blocks */

#define EXT4_XATTR_MAGIC		0xEA020000

/* Maximum number of references to one attribute block */

#define EXT4_XATTR_REFCOUNT_MAX		1024

/* Name indexes */

#define EXT4_XATTR_INDEX_USER			1

#define EXT4_XATTR_INDEX_POSIX_ACL_ACCESS	2

#define EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT	3

#define EXT4_XATTR_INDEX_TRUSTED		4

#define	EXT4_XATTR_INDEX_LUSTRE			5

#define EXT4_XATTR_INDEX_SECURITY	        6

#define EXT4_XATTR_INDEX_SYSTEM			7

#define EXT4_XATTR_INDEX_RICHACL		8

#define EXT4_XATTR_INDEX_ENCRYPTION		9

#define EXT4_XATTR_INDEX_HURD			10 
/* Reserved for Hurd */


struct ext4_xattr_header {
	
__le32	h_magic;	/* magic number for identification */
	
__le32	h_refcount;	/* reference count */
	
__le32	h_blocks;	/* number of disk blocks used */
	
__le32	h_hash;		/* hash value of all attributes */
	
__le32	h_checksum;	/* crc32c(uuid+id+xattrblock) */
				/* id = inum if refcount=1, blknum otherwise */
	
__u32	h_reserved[3];	/* zero right now */
};


struct ext4_xattr_ibody_header {
	
__le32	h_magic;	/* magic number for identification */
};


struct ext4_xattr_entry {
	
__u8	e_name_len;	/* length of name */
	
__u8	e_name_index;	/* attribute name index */
	
__le16	e_value_offs;	/* offset in disk block of value */
	
__le32	e_value_block;	/* disk block attribute is stored on (n/i) */
	
__le32	e_value_size;	/* size of attribute value */
	
__le32	e_hash;		/* hash value of name and value */
	
char	e_name[0];	/* attribute name */
};


#define EXT4_XATTR_PAD_BITS		2

#define EXT4_XATTR_PAD		(1<<EXT4_XATTR_PAD_BITS)

#define EXT4_XATTR_ROUND		(EXT4_XATTR_PAD-1)

#define EXT4_XATTR_LEN(name_len) \
	(((name_len) + EXT4_XATTR_ROUND + \
        sizeof(struct ext4_xattr_entry)) & ~EXT4_XATTR_ROUND)

#define EXT4_XATTR_NEXT(entry) \
	((struct ext4_xattr_entry *)( \
         (char *)(entry) + EXT4_XATTR_LEN((entry)->e_name_len)))

#define EXT4_XATTR_SIZE(size) \
	(((size) + EXT4_XATTR_ROUND) & ~EXT4_XATTR_ROUND)


#define IHDR(inode, raw_inode) \
	((struct ext4_xattr_ibody_header *) \
                ((void *)raw_inode + \
                EXT4_GOOD_OLD_INODE_SIZE + \
                EXT4_I(inode)->i_extra_isize))

#define IFIRST(hdr) ((struct ext4_xattr_entry *)((hdr)+1))


#define BHDR(bh) ((struct ext4_xattr_header *)((bh)->b_data))

#define ENTRY(ptr) ((struct ext4_xattr_entry *)(ptr))

#define BFIRST(bh) ENTRY(BHDR(bh)+1)

#define IS_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0)


#define EXT4_ZERO_XATTR_VALUE ((void *)-1)


struct ext4_xattr_info {
	
int name_index;
	
const char *name;
	
const void *value;
	
size_t value_len;
};


struct ext4_xattr_search {
	
struct ext4_xattr_entry *first;
	
void *base;
	
void *end;
	
struct ext4_xattr_entry *here;
	
int not_found;
};


struct ext4_xattr_ibody_find {
	
struct ext4_xattr_search s;
	
struct ext4_iloc iloc;
};

extern const struct xattr_handler ext4_xattr_user_handler;
extern const struct xattr_handler ext4_xattr_trusted_handler;
extern const struct xattr_handler ext4_xattr_security_handler;


#define EXT4_XATTR_NAME_ENCRYPTION_CONTEXT "c"

extern ssize_t ext4_listxattr(struct dentry *, char *, size_t);

extern int ext4_xattr_get(struct inode *, int, const char *, void *, size_t);
extern int ext4_xattr_set(struct inode *, int, const char *, const void *, size_t, int);
extern int ext4_xattr_set_handle(handle_t *, struct inode *, int, const char *, const void *, size_t, int);

extern void ext4_xattr_delete_inode(handle_t *, struct inode *);

extern int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
			    struct ext4_inode *raw_inode, handle_t *handle);

extern const struct xattr_handler *ext4_xattr_handlers[];

extern int ext4_xattr_ibody_find(struct inode *inode, struct ext4_xattr_info *i,
				 struct ext4_xattr_ibody_find *is);
extern int ext4_xattr_ibody_get(struct inode *inode, int name_index,
				const char *name,
				void *buffer, size_t buffer_size);
extern int ext4_xattr_ibody_inline_set(handle_t *handle, struct inode *inode,
				       struct ext4_xattr_info *i,
				       struct ext4_xattr_ibody_find *is);

extern struct mb_cache *ext4_xattr_create_cache(void);
extern void ext4_xattr_destroy_cache(struct mb_cache *);

#ifdef CONFIG_EXT4_FS_SECURITY
extern int ext4_init_security(handle_t *handle, struct inode *inode,
			      struct inode *dir, const struct qstr *qstr);
#else


static inline int ext4_init_security(handle_t *handle, struct inode *inode,
				     struct inode *dir, const struct qstr *qstr)
{
	return 0;
}
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Directory: fs/ext4

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