xfs_attr_sf.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
 4 * All Rights Reserved.
 5 */
 6#ifndef __XFS_ATTR_SF_H__
 7#define	__XFS_ATTR_SF_H__
 8
 9/*
10 * We generate this then sort it, attr_list() must return things in hash-order.
11 */
12typedef struct xfs_attr_sf_sort {
13	uint8_t		entno;		/* entry number in original list */
14	uint8_t		namelen;	/* length of name value (no null) */
15	uint8_t		valuelen;	/* length of value */
16	uint8_t		flags;		/* flags bits (see xfs_attr_leaf.h) */
17	xfs_dahash_t	hash;		/* this entry's hash value */
18	unsigned char	*name;		/* name value, pointer into buffer */
19	void		*value;
20} xfs_attr_sf_sort_t;
21
22#define XFS_ATTR_SF_ENTSIZE_MAX			/* max space for name&value */ \
23	((1 << (NBBY*(int)sizeof(uint8_t))) - 1)
24
25/* space name/value uses */
26static inline int xfs_attr_sf_entsize_byname(uint8_t nlen, uint8_t vlen)
27{
28	return sizeof(struct xfs_attr_sf_entry) + nlen + vlen;
29}
30
31/* space an entry uses */
32static inline int xfs_attr_sf_entsize(struct xfs_attr_sf_entry *sfep)
33{
34	return struct_size(sfep, nameval, sfep->namelen + sfep->valuelen);
35}
36
37/* first entry in the SF attr fork */
38static inline struct xfs_attr_sf_entry *
39xfs_attr_sf_firstentry(struct xfs_attr_sf_hdr *hdr)
40{
41	return (struct xfs_attr_sf_entry *)(hdr + 1);
42}
43
44/* next entry after sfep */
45static inline struct xfs_attr_sf_entry *
46xfs_attr_sf_nextentry(struct xfs_attr_sf_entry *sfep)
47{
48	return (void *)sfep + xfs_attr_sf_entsize(sfep);
49}
50
51/* pointer to the space after the last entry, e.g. for adding a new one */
52static inline struct xfs_attr_sf_entry *
53xfs_attr_sf_endptr(struct xfs_attr_sf_hdr *sf)
54{
55	return (void *)sf + be16_to_cpu(sf->totsize);
56}
57
58#endif	/* __XFS_ATTR_SF_H__ */