fs/xfs/xfs_acl.h

   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 /*
  22  * Access Control Lists
  23  */
  24 typedef __uint16_t      xfs_acl_perm_t;
  25 typedef __int32_t       xfs_acl_tag_t;
  26 typedef __int32_t       xfs_acl_id_t;
  27
  28 #define XFS_ACL_MAX_ENTRIES 25
  29 #define XFS_ACL_NOT_PRESENT (-1)
  30
  31 typedef struct xfs_acl_entry {
  32         xfs_acl_tag_t   ae_tag;
  33         xfs_acl_id_t    ae_id;
  34         xfs_acl_perm_t  ae_perm;
  35 } xfs_acl_entry_t;
  36
  37 typedef struct xfs_acl {
  38         __int32_t       acl_cnt;
  39         xfs_acl_entry_t acl_entry[XFS_ACL_MAX_ENTRIES];
  40 } xfs_acl_t;
  41
  42 /* On-disk XFS extended attribute names */
  43 #define SGI_ACL_FILE    "SGI_ACL_FILE"
  44 #define SGI_ACL_DEFAULT "SGI_ACL_DEFAULT"
  45 #define SGI_ACL_FILE_SIZE       (sizeof(SGI_ACL_FILE)-1)
  46 #define SGI_ACL_DEFAULT_SIZE    (sizeof(SGI_ACL_DEFAULT)-1)
  47
  48 #define _ACL_TYPE_ACCESS        1
  49 #define _ACL_TYPE_DEFAULT       2
  50
  51 #ifdef CONFIG_XFS_POSIX_ACL
  52
  53 struct vattr;
  54 struct xfs_inode;
  55
  56 extern struct kmem_zone *xfs_acl_zone;
  57 #define xfs_acl_zone_init(zone, name)   \
  58                 (zone) = kmem_zone_init(sizeof(xfs_acl_t), (name))
  59 #define xfs_acl_zone_destroy(zone)      kmem_zone_destroy(zone)
  60
  61 extern int xfs_acl_inherit(struct inode *, mode_t mode, xfs_acl_t *);
  62 extern int xfs_acl_iaccess(struct xfs_inode *, mode_t, cred_t *);
  63 extern int xfs_acl_vtoacl(struct inode *, xfs_acl_t *, xfs_acl_t *);
  64 extern int xfs_acl_vhasacl_access(struct inode *);
  65 extern int xfs_acl_vhasacl_default(struct inode *);
  66 extern int xfs_acl_vset(struct inode *, void *, size_t, int);
  67 extern int xfs_acl_vget(struct inode *, void *, size_t, int);
  68 extern int xfs_acl_vremove(struct inode *, int);
  69
  70 #define _ACL_PERM_INVALID(perm) ((perm) & ~(ACL_READ|ACL_WRITE|ACL_EXECUTE))
  71
  72 #define _ACL_INHERIT(c,m,d)     (xfs_acl_inherit(c,m,d))
  73 #define _ACL_GET_ACCESS(pv,pa)  (xfs_acl_vtoacl(pv,pa,NULL) == 0)
  74 #define _ACL_GET_DEFAULT(pv,pd) (xfs_acl_vtoacl(pv,NULL,pd) == 0)
  75 #define _ACL_ACCESS_EXISTS      xfs_acl_vhasacl_access
  76 #define _ACL_DEFAULT_EXISTS     xfs_acl_vhasacl_default
  77
  78 #define _ACL_ALLOC(a)           ((a) = kmem_zone_alloc(xfs_acl_zone, KM_SLEEP))
  79 #define _ACL_FREE(a)            ((a)? kmem_zone_free(xfs_acl_zone, (a)):(void)0)
  80
  81 #else
  82 #define xfs_acl_zone_init(zone,name)
  83 #define xfs_acl_zone_destroy(zone)
  84 #define xfs_acl_vset(v,p,sz,t)  (-EOPNOTSUPP)
  85 #define xfs_acl_vget(v,p,sz,t)  (-EOPNOTSUPP)
  86 #define xfs_acl_vremove(v,t)    (-EOPNOTSUPP)
  87 #define xfs_acl_vhasacl_access(v)       (0)
  88 #define xfs_acl_vhasacl_default(v)      (0)
  89 #define _ACL_ALLOC(a)           (1)     /* successfully allocate nothing */
  90 #define _ACL_FREE(a)            ((void)0)
  91 #define _ACL_INHERIT(c,m,d)     (0)
  92 #define _ACL_GET_ACCESS(pv,pa)  (0)
  93 #define _ACL_GET_DEFAULT(pv,pd) (0)
  94 #define _ACL_ACCESS_EXISTS      (NULL)
  95 #define _ACL_DEFAULT_EXISTS     (NULL)
  96 #endif
  97
  98 #endif  /* __XFS_ACL_H__ */