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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2005-2019 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/>.
*/
/*
* sysfs interface and mount lifetime management
*/
#ifndef __SYSAUFS_H__
#define __SYSAUFS_H__
#ifdef __KERNEL__
#include <linux/sysfs.h>
#include "module.h"
struct super_block;
struct au_sbinfo;
struct sysaufs_si_attr {
struct attribute attr;
int (*show)(struct seq_file *seq, struct super_block *sb);
};
/* ---------------------------------------------------------------------- */
/* sysaufs.c */
extern unsigned long sysaufs_si_mask;
extern struct kset *sysaufs_kset;
extern struct attribute *sysaufs_si_attrs[];
int sysaufs_si_init(struct au_sbinfo *sbinfo);
int __init sysaufs_init(void);
void sysaufs_fin(void);
/* ---------------------------------------------------------------------- */
/* some people doesn't like to show a pointer in kernel */
static inline unsigned long sysaufs_si_id(struct au_sbinfo *sbinfo)
{
return sysaufs_si_mask ^ (unsigned long)sbinfo;
}
#define SysaufsSiNamePrefix "si_"
#define SysaufsSiNameLen (sizeof(SysaufsSiNamePrefix) + 16)
static inline void sysaufs_name(struct au_sbinfo *sbinfo, char *name)
{
snprintf(name, SysaufsSiNameLen, SysaufsSiNamePrefix "%lx",
sysaufs_si_id(sbinfo));
}
struct au_branch;
#ifdef CONFIG_SYSFS
/* sysfs.c */
extern struct attribute_group *sysaufs_attr_group;
int sysaufs_si_xi_path(struct seq_file *seq, struct super_block *sb);
ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr,
char *buf);
long au_brinfo_ioctl(struct file *file, unsigned long arg);
#ifdef CONFIG_COMPAT
long au_brinfo_compat_ioctl(struct file *file, unsigned long arg);
#endif
void sysaufs_br_init(struct au_branch *br);
void sysaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex);
void sysaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex);
#define sysaufs_brs_init() do {} while (0)
#else
#define sysaufs_attr_group NULL
AuStubInt0(sysaufs_si_xi_path, struct seq_file *seq, struct super_block *sb)
AuStub(ssize_t, sysaufs_si_show, return 0, struct kobject *kobj,
struct attribute *attr, char *buf)
AuStubVoid(sysaufs_br_init, struct au_branch *br)
AuStubVoid(sysaufs_brs_add, struct super_block *sb, aufs_bindex_t bindex)
AuStubVoid(sysaufs_brs_del, struct super_block *sb, aufs_bindex_t bindex)
static inline void sysaufs_brs_init(void)
{
sysaufs_brs = 0;
}
#endif /* CONFIG_SYSFS */
#endif /* __KERNEL__ */
#endif /* __SYSAUFS_H__ */
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