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106 lines
2.3 KiB
106 lines
2.3 KiB
3 years ago
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2014-2020 Junjiro R. Okajima
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*
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* This program, aufs is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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
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* GNU 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 License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* posix acl operations
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*/
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#include <linux/fs.h>
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#include "aufs.h"
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struct posix_acl *aufs_get_acl(struct inode *inode, int type)
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{
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struct posix_acl *acl;
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int err;
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aufs_bindex_t bindex;
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struct inode *h_inode;
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struct super_block *sb;
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acl = NULL;
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sb = inode->i_sb;
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si_read_lock(sb, AuLock_FLUSH);
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ii_read_lock_child(inode);
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if (!(sb->s_flags & SB_POSIXACL))
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goto out;
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bindex = au_ibtop(inode);
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h_inode = au_h_iptr(inode, bindex);
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if (unlikely(!h_inode
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|| ((h_inode->i_mode & S_IFMT)
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!= (inode->i_mode & S_IFMT)))) {
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err = au_busy_or_stale();
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acl = ERR_PTR(err);
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goto out;
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}
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/* always topmost only */
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acl = get_acl(h_inode, type);
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if (IS_ERR(acl))
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forget_cached_acl(inode, type);
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else
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set_cached_acl(inode, type, acl);
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out:
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ii_read_unlock(inode);
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si_read_unlock(sb);
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AuTraceErrPtr(acl);
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return acl;
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}
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int aufs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
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{
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int err;
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ssize_t ssz;
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struct dentry *dentry;
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struct au_sxattr arg = {
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.type = AU_ACL_SET,
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.u.acl_set = {
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.acl = acl,
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.type = type
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},
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};
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IMustLock(inode);
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if (inode->i_ino == AUFS_ROOT_INO)
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dentry = dget(inode->i_sb->s_root);
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else {
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dentry = d_find_alias(inode);
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if (!dentry)
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dentry = d_find_any_alias(inode);
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if (!dentry) {
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pr_warn("cannot handle this inode, "
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"please report to aufs-users ML\n");
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err = -ENOENT;
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goto out;
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}
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}
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ssz = au_sxattr(dentry, inode, &arg);
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/* forget even it if succeeds since the branch might set differently */
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forget_cached_acl(inode, type);
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dput(dentry);
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err = ssz;
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if (ssz >= 0)
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err = 0;
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out:
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return err;
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}
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