105 lines
3.1 KiB
C
105 lines
3.1 KiB
C
/*
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* Copyright (C) 2007 Red Hat. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/fs.h>
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#include <linux/string.h>
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#include <linux/xattr.h>
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#include <linux/posix_acl_xattr.h>
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#include <linux/sched.h>
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#include "ctree.h"
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#include "xattr.h"
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#ifndef is_owner_or_cap
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#define is_owner_or_cap(inode) \
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((current->fsuid == (inode)->i_uid) || capable(CAP_FOWNER))
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#endif
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static int btrfs_xattr_set_acl(struct inode *inode, int type,
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const void *value, size_t size)
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{
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int ret = 0;
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struct posix_acl *acl;
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if (!is_owner_or_cap(inode))
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return -EPERM;
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if (value) {
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acl = posix_acl_from_xattr(value, size);
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if (acl == NULL) {
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value = NULL;
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size = 0;
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} else if (IS_ERR(acl)) {
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ret = PTR_ERR(acl);
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} else {
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ret = posix_acl_valid(acl);
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posix_acl_release(acl);
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}
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if (ret)
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return ret;
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}
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return btrfs_xattr_set(inode, type, "", value, size, 0);
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}
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static int btrfs_xattr_get_acl(struct inode *inode, int type,
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void *value, size_t size)
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{
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return btrfs_xattr_get(inode, type, "", value, size);
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}
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static int btrfs_xattr_acl_access_get(struct inode *inode, const char *name,
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void *value, size_t size)
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{
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if (*name != '\0')
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return -EINVAL;
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return btrfs_xattr_get_acl(inode, BTRFS_XATTR_INDEX_POSIX_ACL_ACCESS,
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value, size);
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}
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static int btrfs_xattr_acl_access_set(struct inode *inode, const char *name,
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const void *value, size_t size, int flags)
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{
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if (*name != '\0')
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return -EINVAL;
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return btrfs_xattr_set_acl(inode, BTRFS_XATTR_INDEX_POSIX_ACL_ACCESS,
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value, size);
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}
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static int btrfs_xattr_acl_default_get(struct inode *inode, const char *name,
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void *value, size_t size)
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{
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if (*name != '\0')
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return -EINVAL;
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return btrfs_xattr_get_acl(inode, BTRFS_XATTR_INDEX_POSIX_ACL_DEFAULT,
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value, size);
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}
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static int btrfs_xattr_acl_default_set(struct inode *inode, const char *name,
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const void *value, size_t size, int flags)
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{
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if (*name != '\0')
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return -EINVAL;
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return btrfs_xattr_set_acl(inode, BTRFS_XATTR_INDEX_POSIX_ACL_DEFAULT,
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value, size);
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}
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struct xattr_handler btrfs_xattr_acl_default_handler = {
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.prefix = POSIX_ACL_XATTR_DEFAULT,
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.list = btrfs_xattr_generic_list,
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.get = btrfs_xattr_acl_default_get,
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.set = btrfs_xattr_acl_default_set,
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};
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struct xattr_handler btrfs_xattr_acl_access_handler = {
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.prefix = POSIX_ACL_XATTR_ACCESS,
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.list = btrfs_xattr_generic_list,
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.get = btrfs_xattr_acl_access_get,
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.set = btrfs_xattr_acl_access_set,
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};
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