LXR linux/fs/xfs/xfs

   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 */
  24typedef __uint16_t      xfs_acl_perm_t;
  25typedef __int32_t       xfs_acl_type_t;
  26typedef __int32_t       xfs_acl_tag_t;
  27typedef __int32_t       xfs_acl_id_t;
  28
  29#define XFS_ACL_MAX_ENTRIES 25
  30#define XFS_ACL_NOT_PRESENT (-1)
  31
  32typedef struct xfs_acl_entry {
  33        xfs_acl_tag_t   ae_tag;
  34        xfs_acl_id_t    ae_id;
  35        xfs_acl_perm_t  ae_perm;
  36} xfs_acl_entry_t;
  37
  38typedef struct xfs_acl {
  39        __int32_t       acl_cnt;
  40        xfs_acl_entry_t acl_entry[XFS_ACL_MAX_ENTRIES];
  41} xfs_acl_t;
  42
  43/* On-disk XFS extended attribute names */
  44#define SGI_ACL_FILE    "SGI_ACL_FILE"
  45#define SGI_ACL_DEFAULT "SGI_ACL_DEFAULT"
  46#define SGI_ACL_FILE_SIZE       (sizeof(SGI_ACL_FILE)-1)
  47#define SGI_ACL_DEFAULT_SIZE    (sizeof(SGI_ACL_DEFAULT)-1)
  48
  49
  50#ifdef CONFIG_XFS_POSIX_ACL
  51
  52struct vattr;
  53struct xfs_inode;
  54
  55extern struct kmem_zone *xfs_acl_zone;
  56#define xfs_acl_zone_init(zone, name)   \
  57                (zone) = kmem_zone_init(sizeof(xfs_acl_t), (name))
  58#define xfs_acl_zone_destroy(zone)      kmem_zone_destroy(zone)
  59
  60extern int xfs_acl_inherit(bhv_vnode_t *, mode_t mode, xfs_acl_t *);
  61extern int xfs_acl_iaccess(struct xfs_inode *, mode_t, cred_t *);
  62extern int xfs_acl_vtoacl(bhv_vnode_t *, xfs_acl_t *, xfs_acl_t *);
  63extern int xfs_acl_vhasacl_access(bhv_vnode_t *);
  64extern int xfs_acl_vhasacl_default(bhv_vnode_t *);
  65extern int xfs_acl_vset(bhv_vnode_t *, void *, size_t, int);
  66extern int xfs_acl_vget(bhv_vnode_t *, void *, size_t, int);
  67extern int xfs_acl_vremove(bhv_vnode_t *, int);
  68
  69#define _ACL_TYPE_ACCESS        1
  70#define _ACL_TYPE_DEFAULT       2
  71#define _ACL_PERM_INVALID(perm) ((perm) & ~(ACL_READ|ACL_WRITE|ACL_EXECUTE))
  72
  73#define _ACL_INHERIT(c,m,d)     (xfs_acl_inherit(c,m,d))
  74#define _ACL_GET_ACCESS(pv,pa)  (xfs_acl_vtoacl(pv,pa,NULL) == 0)
  75#define _ACL_GET_DEFAULT(pv,pd) (xfs_acl_vtoacl(pv,NULL,pd) == 0)
  76#define _ACL_ACCESS_EXISTS      xfs_acl_vhasacl_access
  77#define _ACL_DEFAULT_EXISTS     xfs_acl_vhasacl_default
  78#define _ACL_XFS_IACCESS(i,m,c) (XFS_IFORK_Q(i) ? xfs_acl_iaccess(i,m,c) : -1)
  79
  80#define _ACL_ALLOC(a)           ((a) = kmem_zone_alloc(xfs_acl_zone, KM_SLEEP))
  81#define _ACL_FREE(a)            ((a)? kmem_zone_free(xfs_acl_zone, (a)):(void)0)
  82
  83#else
  84#define xfs_acl_zone_init(zone,name)
  85#define xfs_acl_zone_destroy(zone)
  86#define xfs_acl_vset(v,p,sz,t)  (-EOPNOTSUPP)
  87#define xfs_acl_vget(v,p,sz,t)  (-EOPNOTSUPP)
  88#define xfs_acl_vremove(v,t)    (-EOPNOTSUPP)
  89#define xfs_acl_vhasacl_access(v)       (0)
  90#define xfs_acl_vhasacl_default(v)      (0)
  91#define _ACL_ALLOC(a)           (1)     /* successfully allocate nothing */
  92#define _ACL_FREE(a)            ((void)0)
  93#define _ACL_INHERIT(c,m,d)     (0)
  94#define _ACL_GET_ACCESS(pv,pa)  (0)
  95#define _ACL_GET_DEFAULT(pv,pd) (0)
  96#define _ACL_ACCESS_EXISTS      (NULL)
  97#define _ACL_DEFAULT_EXISTS     (NULL)
  98#define _ACL_XFS_IACCESS(i,m,c) (-1)
  99#endif
 100
 101#endif  /* __XFS_ACL_H__ */
 102