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} xfs_attr_sf_sort_t;
20
21#define XFS_ATTR_SF_ENTSIZE_MAX /* max space for name&value */ \
22 ((1 << (NBBY*(int)sizeof(uint8_t))) - 1)
23
24/* space name/value uses */
25static inline int xfs_attr_sf_entsize_byname(uint8_t nlen, uint8_t vlen)
26{
27 return sizeof(struct xfs_attr_sf_entry) + nlen + vlen;
28}
29
30/* space an entry uses */
31static inline int xfs_attr_sf_entsize(struct xfs_attr_sf_entry *sfep)
32{
33 return struct_size(sfep, nameval, sfep->namelen + sfep->valuelen);
34}
35
36/* first entry in the SF attr fork */
37static inline struct xfs_attr_sf_entry *
38xfs_attr_sf_firstentry(struct xfs_attr_sf_hdr *hdr)
39{
40 return (struct xfs_attr_sf_entry *)(hdr + 1);
41}
42
43/* next entry after sfep */
44static inline struct xfs_attr_sf_entry *
45xfs_attr_sf_nextentry(struct xfs_attr_sf_entry *sfep)
46{
47 return (void *)sfep + xfs_attr_sf_entsize(sfep);
48}
49
50/* pointer to the space after the last entry, e.g. for adding a new one */
51static inline struct xfs_attr_sf_entry *
52xfs_attr_sf_endptr(struct xfs_attr_sf_hdr *sf)
53{
54 return (void *)sf + be16_to_cpu(sf->totsize);
55}
56
57#endif /* __XFS_ATTR_SF_H__ */
58

source code of linux/fs/xfs/libxfs/xfs_attr_sf.h