Root/fs/jfs/jfs_xattr.h

1/*
2 * Copyright (C) International Business Machines Corp., 2000-2002
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
12 * the 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 to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 */
18
19#ifndef H_JFS_XATTR
20#define H_JFS_XATTR
21
22/*
23 * jfs_ea_list describe the on-disk format of the extended attributes.
24 * I know the null-terminator is redundant since namelen is stored, but
25 * I am maintaining compatibility with OS/2 where possible.
26 */
27struct jfs_ea {
28    u8 flag; /* Unused? */
29    u8 namelen; /* Length of name */
30    __le16 valuelen; /* Length of value */
31    char name[0]; /* Attribute name (includes null-terminator) */
32}; /* Value immediately follows name */
33
34struct jfs_ea_list {
35    __le32 size; /* overall size */
36    struct jfs_ea ea[0]; /* Variable length list */
37};
38
39/* Macros for defining maxiumum number of bytes supported for EAs */
40#define MAXEASIZE 65535
41#define MAXEALISTSIZE MAXEASIZE
42
43/*
44 * some macros for dealing with variable length EA lists.
45 */
46#define EA_SIZE(ea) \
47    (sizeof (struct jfs_ea) + (ea)->namelen + 1 + \
48     le16_to_cpu((ea)->valuelen))
49#define NEXT_EA(ea) ((struct jfs_ea *) (((char *) (ea)) + (EA_SIZE (ea))))
50#define FIRST_EA(ealist) ((ealist)->ea)
51#define EALIST_SIZE(ealist) le32_to_cpu((ealist)->size)
52#define END_EALIST(ealist) \
53    ((struct jfs_ea *) (((char *) (ealist)) + EALIST_SIZE(ealist)))
54
55extern int __jfs_setxattr(tid_t, struct inode *, const char *, const void *,
56              size_t, int);
57extern int jfs_setxattr(struct dentry *, const char *, const void *, size_t,
58            int);
59extern ssize_t __jfs_getxattr(struct inode *, const char *, void *, size_t);
60extern ssize_t jfs_getxattr(struct dentry *, const char *, void *, size_t);
61extern ssize_t jfs_listxattr(struct dentry *, char *, size_t);
62extern int jfs_removexattr(struct dentry *, const char *);
63
64#ifdef CONFIG_JFS_SECURITY
65extern int jfs_init_security(tid_t, struct inode *, struct inode *,
66                 const struct qstr *);
67#else
68static inline int jfs_init_security(tid_t tid, struct inode *inode,
69                    struct inode *dir, const struct qstr *qstr)
70{
71    return 0;
72}
73#endif
74
75#endif /* H_JFS_XATTR */
76

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