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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2014-2019 Junjiro R. Okajima
*
* This program, aufs is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* posix acl operations
*/
#include <linux/fs.h>
#include "aufs.h"
struct posix_acl *aufs_get_acl(struct inode *inode, int type)
{
struct posix_acl *acl;
int err;
aufs_bindex_t bindex;
struct inode *h_inode;
struct super_block *sb;
acl = NULL;
sb = inode->i_sb;
si_read_lock(sb, AuLock_FLUSH);
ii_read_lock_child(inode);
if (!(sb->s_flags & SB_POSIXACL))
goto out;
bindex = au_ibtop(inode);
h_inode = au_h_iptr(inode, bindex);
if (unlikely(!h_inode
|| ((h_inode->i_mode & S_IFMT)
!= (inode->i_mode & S_IFMT)))) {
err = au_busy_or_stale();
acl = ERR_PTR(err);
goto out;
}
/* always topmost only */
acl = get_acl(h_inode, type);
if (!IS_ERR_OR_NULL(acl))
set_cached_acl(inode, type, acl);
out:
ii_read_unlock(inode);
si_read_unlock(sb);
AuTraceErrPtr(acl);
return acl;
}
int aufs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
{
int err;
ssize_t ssz;
struct dentry *dentry;
struct au_sxattr arg = {
.type = AU_ACL_SET,
.u.acl_set = {
.acl = acl,
.type = type
},
};
IMustLock(inode);
if (inode->i_ino == AUFS_ROOT_INO)
dentry = dget(inode->i_sb->s_root);
else {
dentry = d_find_alias(inode);
if (!dentry)
dentry = d_find_any_alias(inode);
if (!dentry) {
pr_warn("cannot handle this inode, "
"please report to aufs-users ML\n");
err = -ENOENT;
goto out;
}
}
ssz = au_sxattr(dentry, inode, &arg);
dput(dentry);
err = ssz;
if (ssz >= 0) {
err = 0;
set_cached_acl(inode, type, acl);
}
out:
return err;
}
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