fs/btrfs/acl.c

   1 /*
   2  * Copyright (C) 2007 Red Hat.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public
   6  * License v2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public
  14  * License along with this program; if not, write to the
  15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  16  * Boston, MA 021110-1307, USA.
  17  */
  18
  19 #include <linux/fs.h>
  20 #include <linux/string.h>
  21 #include <linux/xattr.h>
  22 #include <linux/posix_acl_xattr.h>
  23 #include "ctree.h"
  24 #include "xattr.h"
  25 static int btrfs_xattr_set_acl(struct inode *inode, int type,
  26                                const void *value, size_t size)
  27 {
  28         int ret = 0;
  29         struct posix_acl *acl;
  30
  31         if (!is_owner_or_cap(inode))
  32                 return -EPERM;
  33         if (value) {
  34                 acl = posix_acl_from_xattr(value, size);
  35                 if (acl == NULL) {
  36                         value = NULL;
  37                         size = 0;
  38                 } else if (IS_ERR(acl)) {
  39                         ret = PTR_ERR(acl);
  40                 } else {
  41                         ret = posix_acl_valid(acl);
  42                         posix_acl_release(acl);
  43                 }
  44                 if (ret)
  45                         return ret;
  46         }
  47         return btrfs_xattr_set(inode, type, "", value, size, 0);
  48 }
  49
  50 static int btrfs_xattr_get_acl(struct inode *inode, int type,
  51                                void *value, size_t size)
  52 {
  53         return btrfs_xattr_get(inode, type, "", value, size);
  54 }
  55 static int btrfs_xattr_acl_access_get(struct inode *inode, const char *name,
  56                                       void *value, size_t size)
  57 {
  58         if (*name != '\0')
  59                return -EINVAL;
  60         return btrfs_xattr_get_acl(inode, BTRFS_XATTR_INDEX_POSIX_ACL_ACCESS,
  61                                    value, size);
  62 }
  63 static int btrfs_xattr_acl_access_set(struct inode *inode, const char *name,
  64                                       const void *value, size_t size, int flags)
  65 {
  66         if (*name != '\0')
  67                return -EINVAL;
  68         return btrfs_xattr_set_acl(inode, BTRFS_XATTR_INDEX_POSIX_ACL_ACCESS,
  69                                    value, size);
  70 }
  71 static int btrfs_xattr_acl_default_get(struct inode *inode, const char *name,
  72                                        void *value, size_t size)
  73 {
  74         if (*name != '\0')
  75                return -EINVAL;
  76         return btrfs_xattr_get_acl(inode, BTRFS_XATTR_INDEX_POSIX_ACL_DEFAULT,
  77                                    value, size);
  78 }
  79 static int btrfs_xattr_acl_default_set(struct inode *inode, const char *name,
  80                                        const void *value, size_t size, int flags)
  81 {
  82         if (*name != '\0')
  83                return -EINVAL;
  84         return btrfs_xattr_set_acl(inode, BTRFS_XATTR_INDEX_POSIX_ACL_DEFAULT,
  85                                    value, size);
  86 }
  87 struct xattr_handler btrfs_xattr_acl_default_handler = {
  88         .prefix = POSIX_ACL_XATTR_DEFAULT,
  89         .list   = btrfs_xattr_generic_list,
  90         .get    = btrfs_xattr_acl_default_get,
  91         .set    = btrfs_xattr_acl_default_set,
  92 };
  93
  94 struct xattr_handler btrfs_xattr_acl_access_handler = {
  95         .prefix = POSIX_ACL_XATTR_ACCESS,
  96         .list   = btrfs_xattr_generic_list,
  97         .get    = btrfs_xattr_acl_access_get,
  98         .set    = btrfs_xattr_acl_access_set,
  99 };