1/*
2 * Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
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.
13 *
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
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
28/*
29 * Entries are packed toward the top as tight as possible.
30 */
31typedef struct xfs_attr_shortform {
32	struct xfs_attr_sf_hdr {	/* constant-structure header block */
33		__be16	totsize;	/* total bytes in shortform list */
34		__u8	count;	/* count of active entries */
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;
43typedef struct xfs_attr_sf_hdr xfs_attr_sf_hdr_t;
44typedef 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 */
49typedef 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 */
55	unsigned char	*name;		/* name value, pointer into buffer */
56} xfs_attr_sf_sort_t;
57
58#define XFS_ATTR_SF_ENTSIZE_BYNAME(nlen,vlen)	/* space name/value uses */ \
59	(((int)sizeof(xfs_attr_sf_entry_t)-1 + (nlen)+(vlen)))
60#define XFS_ATTR_SF_ENTSIZE_MAX			/* max space for name&value */ \
61	((1 << (NBBY*(int)sizeof(__uint8_t))) - 1)
62#define XFS_ATTR_SF_ENTSIZE(sfep)		/* space an entry uses */ \
63	((int)sizeof(xfs_attr_sf_entry_t)-1 + (sfep)->namelen+(sfep)->valuelen)
64#define XFS_ATTR_SF_NEXTENTRY(sfep)		/* next entry in struct */ \
65	((xfs_attr_sf_entry_t *)((char *)(sfep) + XFS_ATTR_SF_ENTSIZE(sfep)))
66#define XFS_ATTR_SF_TOTSIZE(dp)			/* total space in use */ \
67	(be16_to_cpu(((xfs_attr_shortform_t *)	\
68		((dp)->i_afp->if_u1.if_data))->hdr.totsize))
69
70#endif	/* __XFS_ATTR_SF_H__ */
71