fs/xfs/xfs_acl.h

   1 /*
   2  * Copyright (c) 2001-2004 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32 #ifndef __XFS_ACL_H__
  33 #define __XFS_ACL_H__
  34
  35 /*
  36  * Access Control Lists
  37  */
  38 typedef __uint16_t      xfs_acl_perm_t;
  39 typedef __int32_t       xfs_acl_type_t;
  40 typedef __int32_t       xfs_acl_tag_t;
  41 typedef __int32_t       xfs_acl_id_t;
  42
  43 #define XFS_ACL_MAX_ENTRIES 25
  44 #define XFS_ACL_NOT_PRESENT (-1)
  45
  46 typedef struct xfs_acl_entry {
  47         xfs_acl_tag_t   ae_tag;
  48         xfs_acl_id_t    ae_id;
  49         xfs_acl_perm_t  ae_perm;
  50 } xfs_acl_entry_t;
  51
  52 typedef struct xfs_acl {
  53         __int32_t       acl_cnt;
  54         xfs_acl_entry_t acl_entry[XFS_ACL_MAX_ENTRIES];
  55 } xfs_acl_t;
  56
  57 /* On-disk XFS extended attribute names */
  58 #define SGI_ACL_FILE    "SGI_ACL_FILE"
  59 #define SGI_ACL_DEFAULT "SGI_ACL_DEFAULT"
  60 #define SGI_ACL_FILE_SIZE       (sizeof(SGI_ACL_FILE)-1)
  61 #define SGI_ACL_DEFAULT_SIZE    (sizeof(SGI_ACL_DEFAULT)-1)
  62
  63
  64 #ifdef CONFIG_XFS_POSIX_ACL
  65
  66 struct vattr;
  67 struct vnode;
  68 struct xfs_inode;
  69
  70 extern struct kmem_zone *xfs_acl_zone;
  71 #define xfs_acl_zone_init(zone, name)   \
  72                 (zone) = kmem_zone_init(sizeof(xfs_acl_t), name)
  73 #define xfs_acl_zone_destroy(zone)      kmem_cache_destroy(zone)
  74
  75 extern int xfs_acl_inherit(struct vnode *, struct vattr *, xfs_acl_t *);
  76 extern int xfs_acl_iaccess(struct xfs_inode *, mode_t, cred_t *);
  77 extern int xfs_acl_vtoacl(struct vnode *, xfs_acl_t *, xfs_acl_t *);
  78 extern int xfs_acl_vhasacl_access(struct vnode *);
  79 extern int xfs_acl_vhasacl_default(struct vnode *);
  80 extern int xfs_acl_vset(struct vnode *, void *, size_t, int);
  81 extern int xfs_acl_vget(struct vnode *, void *, size_t, int);
  82 extern int xfs_acl_vremove(struct vnode *vp, int);
  83
  84 #define _ACL_TYPE_ACCESS        1
  85 #define _ACL_TYPE_DEFAULT       2
  86 #define _ACL_PERM_INVALID(perm) ((perm) & ~(ACL_READ|ACL_WRITE|ACL_EXECUTE))
  87
  88 #define _ACL_INHERIT(c,v,d)     (xfs_acl_inherit(c,v,d))
  89 #define _ACL_GET_ACCESS(pv,pa)  (xfs_acl_vtoacl(pv,pa,NULL) == 0)
  90 #define _ACL_GET_DEFAULT(pv,pd) (xfs_acl_vtoacl(pv,NULL,pd) == 0)
  91 #define _ACL_ACCESS_EXISTS      xfs_acl_vhasacl_access
  92 #define _ACL_DEFAULT_EXISTS     xfs_acl_vhasacl_default
  93 #define _ACL_XFS_IACCESS(i,m,c) (XFS_IFORK_Q(i) ? xfs_acl_iaccess(i,m,c) : -1)
  94
  95 #define _ACL_ALLOC(a)           ((a) = kmem_zone_alloc(xfs_acl_zone, KM_SLEEP))
  96 #define _ACL_FREE(a)            ((a)? kmem_zone_free(xfs_acl_zone, (a)):(void)0)
  97
  98 #else
  99 #define xfs_acl_zone_init(zone,name)
 100 #define xfs_acl_zone_destroy(zone)
 101 #define xfs_acl_vset(v,p,sz,t)  (-EOPNOTSUPP)
 102 #define xfs_acl_vget(v,p,sz,t)  (-EOPNOTSUPP)
 103 #define xfs_acl_vremove(v,t)    (-EOPNOTSUPP)
 104 #define xfs_acl_vhasacl_access(v)       (0)
 105 #define xfs_acl_vhasacl_default(v)      (0)
 106 #define _ACL_ALLOC(a)           (1)     /* successfully allocate nothing */
 107 #define _ACL_FREE(a)            ((void)0)
 108 #define _ACL_INHERIT(c,v,d)     (0)
 109 #define _ACL_GET_ACCESS(pv,pa)  (0)
 110 #define _ACL_GET_DEFAULT(pv,pd) (0)
 111 #define _ACL_ACCESS_EXISTS      (NULL)
 112 #define _ACL_DEFAULT_EXISTS     (NULL)
 113 #define _ACL_XFS_IACCESS(i,m,c) (-1)
 114 #endif
 115
 116 #endif  /* __XFS_ACL_H__ */