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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Nathan Scott7b718762005-11-02 14:58:39 +11002 * Copyright (c) 2001-2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott7b718762005-11-02 14:58:39 +11005 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott7b718762005-11-02 14:58:39 +11009 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott7b718762005-11-02 14:58:39 +110014 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
18#ifndef __XFS_ACL_H__
19#define __XFS_ACL_H__
20
Christoph Hellwigef14f0c2009-06-10 17:07:47 +020021struct inode;
22struct posix_acl;
23struct xfs_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#define XFS_ACL_NOT_PRESENT (-1)
26
Christoph Hellwigef14f0c2009-06-10 17:07:47 +020027/* On-disk XFS access control list structure */
Dave Chinner0a8aa192013-06-05 12:09:10 +100028struct 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 */
Christoph Hellwigef14f0c2009-06-10 17:07:47 +020033};
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
Dave Chinner0a8aa192013-06-05 12:09:10 +100035struct xfs_acl {
36 __be32 acl_cnt;
37 struct xfs_acl_entry acl_entry[0];
38};
39
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070055/* On-disk XFS extended attribute names */
Dave Chinnera9273ca2010-01-20 10:47:48 +110056#define SGI_ACL_FILE (unsigned char *)"SGI_ACL_FILE"
57#define SGI_ACL_DEFAULT (unsigned char *)"SGI_ACL_DEFAULT"
Linus Torvalds1da177e2005-04-16 15:20:36 -070058#define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1)
59#define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1)
60
Linus Torvalds1da177e2005-04-16 15:20:36 -070061#ifdef CONFIG_XFS_POSIX_ACL
Christoph Hellwigef14f0c2009-06-10 17:07:47 +020062extern struct posix_acl *xfs_get_acl(struct inode *inode, int type);
63extern int xfs_inherit_acl(struct inode *inode, struct posix_acl *default_acl);
64extern int xfs_acl_chmod(struct inode *inode);
Christoph Hellwigef14f0c2009-06-10 17:07:47 +020065extern int posix_acl_access_exists(struct inode *inode);
66extern int posix_acl_default_exists(struct inode *inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
Stephen Hemminger46e58762010-05-13 17:53:20 -070068extern const struct xattr_handler xfs_xattr_acl_access_handler;
69extern const struct xattr_handler xfs_xattr_acl_default_handler;
Linus Torvalds1da177e2005-04-16 15:20:36 -070070#else
Markus Trippelsdorfa5a7bbc2011-07-26 11:15:20 +020071static inline struct posix_acl *xfs_get_acl(struct inode *inode, int type)
72{
73 return NULL;
74}
Christoph Hellwigef14f0c2009-06-10 17:07:47 +020075# define xfs_inherit_acl(inode, default_acl) 0
76# define xfs_acl_chmod(inode) 0
Christoph Hellwigef14f0c2009-06-10 17:07:47 +020077# define posix_acl_access_exists(inode) 0
78# define posix_acl_default_exists(inode) 0
79#endif /* CONFIG_XFS_POSIX_ACL */
Linus Torvalds1da177e2005-04-16 15:20:36 -070080#endif /* __XFS_ACL_H__ */