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105 lines
2.3 KiB
105 lines
2.3 KiB
// 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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