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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2005-2020 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/>.
*/
/*
* whiteout for logical deletion and opaque directory
*/
#ifndef __AUFS_WHOUT_H__
#define __AUFS_WHOUT_H__
#ifdef __KERNEL__
#include "dir.h"
/* whout.c */
int au_wh_name_alloc(struct qstr *wh, const struct qstr *name);
int au_wh_test(struct dentry *h_parent, struct qstr *wh_name, int try_sio);
int au_diropq_test(struct dentry *h_dentry);
struct au_branch;
struct dentry *au_whtmp_lkup(struct dentry *h_parent, struct au_branch *br,
struct qstr *prefix);
int au_whtmp_ren(struct dentry *h_dentry, struct au_branch *br);
int au_wh_unlink_dentry(struct inode *h_dir, struct path *h_path,
struct dentry *dentry);
int au_wh_init(struct au_branch *br, struct super_block *sb);
/* diropq flags */
#define AuDiropq_CREATE 1
#define au_ftest_diropq(flags, name) ((flags) & AuDiropq_##name)
#define au_fset_diropq(flags, name) \
do { (flags) |= AuDiropq_##name; } while (0)
#define au_fclr_diropq(flags, name) \
do { (flags) &= ~AuDiropq_##name; } while (0)
struct dentry *au_diropq_sio(struct dentry *dentry, aufs_bindex_t bindex,
unsigned int flags);
struct dentry *au_wh_lkup(struct dentry *h_parent, struct qstr *base_name,
struct au_branch *br);
struct dentry *au_wh_create(struct dentry *dentry, aufs_bindex_t bindex,
struct dentry *h_parent);
/* real rmdir for the whiteout-ed dir */
struct au_whtmp_rmdir {
struct inode *dir;
struct au_branch *br;
struct dentry *wh_dentry;
struct au_nhash whlist;
};
struct au_whtmp_rmdir *au_whtmp_rmdir_alloc(struct super_block *sb, gfp_t gfp);
void au_whtmp_rmdir_free(struct au_whtmp_rmdir *whtmp);
int au_whtmp_rmdir(struct inode *dir, aufs_bindex_t bindex,
struct dentry *wh_dentry, struct au_nhash *whlist);
void au_whtmp_kick_rmdir(struct inode *dir, aufs_bindex_t bindex,
struct dentry *wh_dentry, struct au_whtmp_rmdir *args);
/* ---------------------------------------------------------------------- */
static inline struct dentry *au_diropq_create(struct dentry *dentry,
aufs_bindex_t bindex)
{
return au_diropq_sio(dentry, bindex, AuDiropq_CREATE);
}
static inline int au_diropq_remove(struct dentry *dentry, aufs_bindex_t bindex)
{
return PTR_ERR(au_diropq_sio(dentry, bindex, !AuDiropq_CREATE));
}
#endif /* __KERNEL__ */
#endif /* __AUFS_WHOUT_H__ */
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