[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / xfs / xfs_attr_sf.h

/*
 * Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef __XFS_ATTR_SF_H__
#define	__XFS_ATTR_SF_H__

/*
 * Attribute storage when stored inside the inode.
 *
 * Small attribute lists are packed as tightly as possible so as
 * to fit into the literal area of the inode.
 */

/*
 * Entries are packed toward the top as tight as possible.
 */
typedef struct xfs_attr_shortform {
	struct xfs_attr_sf_hdr {	/* constant-structure header block */
		__be16	totsize;	/* total bytes in shortform list */
		__u8	count;	/* count of active entries */
	} hdr;
	struct xfs_attr_sf_entry {
		__uint8_t namelen;	/* actual length of name (no NULL) */
		__uint8_t valuelen;	/* actual length of value (no NULL) */
		__uint8_t flags;	/* flags bits (see xfs_attr_leaf.h) */
		__uint8_t nameval[1];	/* name & value bytes concatenated */
	} list[1];			/* variable sized array */
} xfs_attr_shortform_t;
typedef struct xfs_attr_sf_hdr xfs_attr_sf_hdr_t;
typedef struct xfs_attr_sf_entry xfs_attr_sf_entry_t;

/*
 * We generate this then sort it, attr_list() must return things in hash-order.
 */
typedef struct xfs_attr_sf_sort {
	__uint8_t	entno;		/* entry number in original list */
	__uint8_t	namelen;	/* length of name value (no null) */
	__uint8_t	valuelen;	/* length of value */
	__uint8_t	flags;		/* flags bits (see xfs_attr_leaf.h) */
	xfs_dahash_t	hash;		/* this entry's hash value */
	unsigned char	*name;		/* name value, pointer into buffer */
} xfs_attr_sf_sort_t;

#define XFS_ATTR_SF_ENTSIZE_BYNAME(nlen,vlen)	/* space name/value uses */ \
	(((int)sizeof(xfs_attr_sf_entry_t)-1 + (nlen)+(vlen)))
#define XFS_ATTR_SF_ENTSIZE_MAX			/* max space for name&value */ \
	((1 << (NBBY*(int)sizeof(__uint8_t))) - 1)
#define XFS_ATTR_SF_ENTSIZE(sfep)		/* space an entry uses */ \
	((int)sizeof(xfs_attr_sf_entry_t)-1 + (sfep)->namelen+(sfep)->valuelen)
#define XFS_ATTR_SF_NEXTENTRY(sfep)		/* next entry in struct */ \
	((xfs_attr_sf_entry_t *)((char *)(sfep) + XFS_ATTR_SF_ENTSIZE(sfep)))
#define XFS_ATTR_SF_TOTSIZE(dp)			/* total space in use */ \
	(be16_to_cpu(((xfs_attr_shortform_t *)	\
		((dp)->i_afp->if_u1.if_data))->hdr.totsize))

#endif	/* __XFS_ATTR_SF_H__ */
Commit	Line	Data
1da177e4	1	/*
7b718769 NS	2	* Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
7b718769 NS	3	* All Rights Reserved.
1da177e4	4	*
7b718769 NS	5	* This program is free software; you can redistribute it and/or
7b718769 NS	6	* modify it under the terms of the GNU General Public License as
1da177e4 LT	7	* published by the Free Software Foundation.
1da177e4 LT	8	*
7b718769 NS	9	* This program is distributed in the hope that it would be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
1da177e4	13	*
7b718769 NS	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write the Free Software Foundation,
	16	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1da177e4 LT	17	*/
	18	#ifndef __XFS_ATTR_SF_H__
	19	#define __XFS_ATTR_SF_H__
	20
	21	/*
	22	* Attribute storage when stored inside the inode.
	23	*
	24	* Small attribute lists are packed as tightly as possible so as
	25	* to fit into the literal area of the inode.
	26	*/
	27
1da177e4 LT	28	/*
	29	* Entries are packed toward the top as tight as possible.
	30	*/
	31	typedef struct xfs_attr_shortform {
	32	struct xfs_attr_sf_hdr { /* constant-structure header block */
3b244aa8 NS	33	__be16 totsize; /* total bytes in shortform list */
3b244aa8 NS	34	__u8 count; /* count of active entries */
1da177e4 LT	35	} hdr;
	36	struct xfs_attr_sf_entry {
	37	__uint8_t namelen; /* actual length of name (no NULL) */
	38	__uint8_t valuelen; /* actual length of value (no NULL) */
	39	__uint8_t flags; /* flags bits (see xfs_attr_leaf.h) */
	40	__uint8_t nameval[1]; /* name & value bytes concatenated */
	41	} list[1]; /* variable sized array */
	42	} xfs_attr_shortform_t;
	43	typedef struct xfs_attr_sf_hdr xfs_attr_sf_hdr_t;
	44	typedef struct xfs_attr_sf_entry xfs_attr_sf_entry_t;
	45
	46	/*
	47	* We generate this then sort it, attr_list() must return things in hash-order.
	48	*/
	49	typedef struct xfs_attr_sf_sort {
	50	__uint8_t entno; /* entry number in original list */
	51	__uint8_t namelen; /* length of name value (no null) */
	52	__uint8_t valuelen; /* length of value */
	53	__uint8_t flags; /* flags bits (see xfs_attr_leaf.h) */
	54	xfs_dahash_t hash; /* this entry's hash value */
a9273ca5	55	unsigned char name; / name value, pointer into buffer */
1da177e4 LT	56	} xfs_attr_sf_sort_t;
1da177e4 LT	57
1da177e4	58	#define XFS_ATTR_SF_ENTSIZE_BYNAME(nlen,vlen) /* space name/value uses */ \
a844f451	59	(((int)sizeof(xfs_attr_sf_entry_t)-1 + (nlen)+(vlen)))
1da177e4 LT	60	#define XFS_ATTR_SF_ENTSIZE_MAX /* max space for name&value */ \
1da177e4 LT	61	((1 << (NBBY*(int)sizeof(__uint8_t))) - 1)
1da177e4 LT	62	#define XFS_ATTR_SF_ENTSIZE(sfep) /* space an entry uses */ \
1da177e4 LT	63	((int)sizeof(xfs_attr_sf_entry_t)-1 + (sfep)->namelen+(sfep)->valuelen)
1da177e4	64	#define XFS_ATTR_SF_NEXTENTRY(sfep) /* next entry in struct */ \
a844f451	65	((xfs_attr_sf_entry_t )((char )(sfep) + XFS_ATTR_SF_ENTSIZE(sfep)))
1da177e4	66	#define XFS_ATTR_SF_TOTSIZE(dp) /* total space in use */ \
3b244aa8 NS	67	(be16_to_cpu(((xfs_attr_shortform_t *) \
3b244aa8 NS	68	((dp)->i_afp->if_u1.if_data))->hdr.totsize))
1da177e4	69
1da177e4	70	#endif /* __XFS_ATTR_SF_H__ */