1 /* 2 * Copyright (c) 2001-2005 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 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 7 * published by the Free Software Foundation. 8 * 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. 13 * 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 17 */ 18 #ifndef __XFS_ACL_H__ 19 #define __XFS_ACL_H__ 20 21 struct inode; 22 struct posix_acl; 23 struct xfs_inode; 24 25 #define XFS_ACL_NOT_PRESENT (-1) 26 27 /* On-disk XFS access control list structure */ 28 struct 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 35 struct 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 55 /* On-disk XFS extended attribute names */ 56 #define SGI_ACL_FILE (unsigned char *)"SGI_ACL_FILE" 57 #define SGI_ACL_DEFAULT (unsigned char *)"SGI_ACL_DEFAULT" 58 #define SGI_ACL_FILE_SIZE (sizeof(SGI_ACL_FILE)-1) 59 #define SGI_ACL_DEFAULT_SIZE (sizeof(SGI_ACL_DEFAULT)-1) 60 61 #ifdef CONFIG_XFS_POSIX_ACL 62 extern struct posix_acl *xfs_get_acl(struct inode *inode, int type); 63 extern int xfs_set_acl(struct inode *inode, struct posix_acl *acl, int type); 64 extern int posix_acl_access_exists(struct inode *inode); 65 extern int posix_acl_default_exists(struct inode *inode); 66 #else 67 static inline struct posix_acl *xfs_get_acl(struct inode *inode, int type) 68 { 69 return NULL; 70 } 71 # define xfs_set_acl NULL 72 # define posix_acl_access_exists(inode) 0 73 # define posix_acl_default_exists(inode) 0 74 #endif /* CONFIG_XFS_POSIX_ACL */ 75 #endif /* __XFS_ACL_H__ */ 76