Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-2.6-block.git] / fs / xfs / xfs_acl.h
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1da177e4 1/*
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2 * Copyright (c) 2001-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
1da177e4 4 *
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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
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7 * published by the Free Software Foundation.
8 *
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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 *
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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
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17 */
18#ifndef __XFS_ACL_H__
19#define __XFS_ACL_H__
20
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21struct inode;
22struct posix_acl;
23struct xfs_inode;
1da177e4 24
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25#define XFS_ACL_NOT_PRESENT (-1)
26
ef14f0c1 27/* On-disk XFS access control list structure */
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28struct xfs_acl_entry {
29 __be32 ae_tag;
30 __be32 ae_id;
31 __be16 ae_perm;
32 __be16 ae_pad; /* fill the implicit hole in the structure */
33};
34
ef14f0c1 35struct xfs_acl {
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36 __be32 acl_cnt;
37 struct xfs_acl_entry acl_entry[0];
ef14f0c1 38};
1da177e4 39
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40/*
41 * The number of ACL entries allowed is defined by the on-disk format.
42 * For v4 superblocks, that is limited to 25 entries. For v5 superblocks, it is
43 * limited only by the maximum size of the xattr that stores the information.
44 */
45#define XFS_ACL_MAX_ENTRIES(mp) \
46 (xfs_sb_version_hascrc(&mp->m_sb) \
47 ? (XATTR_SIZE_MAX - sizeof(struct xfs_acl)) / \
48 sizeof(struct xfs_acl_entry) \
49 : 25)
50
51#define XFS_ACL_MAX_SIZE(mp) \
52 (sizeof(struct xfs_acl) + \
53 sizeof(struct xfs_acl_entry) * XFS_ACL_MAX_ENTRIES((mp)))
54
1da177e4 55/* On-disk XFS extended attribute names */
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56#define SGI_ACL_FILE (unsigned char *)"SGI_ACL_FILE"
57#define SGI_ACL_DEFAULT (unsigned char *)"SGI_ACL_DEFAULT"
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58#define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1)
59#define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1)
60
1da177e4 61#ifdef CONFIG_XFS_POSIX_ACL
ef14f0c1 62extern struct posix_acl *xfs_get_acl(struct inode *inode, int type);
2401dc29 63extern int xfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
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64extern int posix_acl_access_exists(struct inode *inode);
65extern int posix_acl_default_exists(struct inode *inode);
1da177e4 66#else
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67static inline struct posix_acl *xfs_get_acl(struct inode *inode, int type)
68{
69 return NULL;
70}
2401dc29 71# define xfs_set_acl NULL
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72# define posix_acl_access_exists(inode) 0
73# define posix_acl_default_exists(inode) 0
74#endif /* CONFIG_XFS_POSIX_ACL */
1da177e4 75#endif /* __XFS_ACL_H__ */