167 lines
3.7 KiB
C
167 lines
3.7 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/posix_acl.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include "ctree.h"
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#include "btrfs_inode.h"
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#include "xattr.h"
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struct posix_acl *btrfs_get_acl(struct inode *inode, int type)
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{
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int size;
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const char *name;
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char *value = NULL;
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struct posix_acl *acl;
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switch (type) {
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case ACL_TYPE_ACCESS:
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name = POSIX_ACL_XATTR_ACCESS;
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break;
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case ACL_TYPE_DEFAULT:
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name = POSIX_ACL_XATTR_DEFAULT;
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break;
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default:
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BUG();
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}
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size = __btrfs_getxattr(inode, name, "", 0);
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if (size > 0) {
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value = kzalloc(size, GFP_NOFS);
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if (!value)
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return ERR_PTR(-ENOMEM);
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size = __btrfs_getxattr(inode, name, value, size);
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}
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if (size > 0) {
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acl = posix_acl_from_xattr(&init_user_ns, value, size);
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} else if (size == -ENOENT || size == -ENODATA || size == 0) {
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/* FIXME, who returns -ENOENT? I think nobody */
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acl = NULL;
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} else {
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acl = ERR_PTR(-EIO);
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}
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kfree(value);
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if (!IS_ERR(acl))
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set_cached_acl(inode, type, acl);
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return acl;
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}
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/*
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* Needs to be called with fs_mutex held
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*/
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static int __btrfs_set_acl(struct btrfs_trans_handle *trans,
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struct inode *inode, struct posix_acl *acl, int type)
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{
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int ret, size = 0;
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const char *name;
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char *value = NULL;
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switch (type) {
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case ACL_TYPE_ACCESS:
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name = POSIX_ACL_XATTR_ACCESS;
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if (acl) {
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ret = posix_acl_equiv_mode(acl, &inode->i_mode);
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if (ret < 0)
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return ret;
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if (ret == 0)
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acl = NULL;
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}
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ret = 0;
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break;
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case ACL_TYPE_DEFAULT:
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if (!S_ISDIR(inode->i_mode))
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return acl ? -EINVAL : 0;
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name = POSIX_ACL_XATTR_DEFAULT;
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break;
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default:
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return -EINVAL;
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}
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if (acl) {
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size = posix_acl_xattr_size(acl->a_count);
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value = kmalloc(size, GFP_NOFS);
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if (!value) {
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ret = -ENOMEM;
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goto out;
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}
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ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
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if (ret < 0)
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goto out;
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}
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ret = __btrfs_setxattr(trans, inode, name, value, size, 0);
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out:
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kfree(value);
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if (!ret)
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set_cached_acl(inode, type, acl);
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return ret;
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}
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int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
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{
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return __btrfs_set_acl(NULL, inode, acl, type);
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}
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/*
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* btrfs_init_acl is already generally called under fs_mutex, so the locking
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* stuff has been fixed to work with that. If the locking stuff changes, we
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* need to re-evaluate the acl locking stuff.
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*/
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int btrfs_init_acl(struct btrfs_trans_handle *trans,
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struct inode *inode, struct inode *dir)
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{
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struct posix_acl *default_acl, *acl;
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int ret = 0;
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/* this happens with subvols */
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if (!dir)
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return 0;
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ret = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
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if (ret)
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return ret;
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if (default_acl) {
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ret = __btrfs_set_acl(trans, inode, default_acl,
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ACL_TYPE_DEFAULT);
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posix_acl_release(default_acl);
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}
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if (acl) {
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if (!ret)
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ret = __btrfs_set_acl(trans, inode, acl,
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ACL_TYPE_ACCESS);
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posix_acl_release(acl);
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}
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if (!default_acl && !acl)
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cache_no_acl(inode);
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return ret;
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}
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