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103 lines
3.0 KiB
103 lines
3.0 KiB
3 years ago
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2005-2020 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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* sysfs interface and mount lifetime management
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*/
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#ifndef __SYSAUFS_H__
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#define __SYSAUFS_H__
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#ifdef __KERNEL__
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#include <linux/sysfs.h>
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#include "module.h"
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struct super_block;
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struct au_sbinfo;
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struct sysaufs_si_attr {
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struct attribute attr;
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int (*show)(struct seq_file *seq, struct super_block *sb);
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};
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/* ---------------------------------------------------------------------- */
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/* sysaufs.c */
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extern unsigned long sysaufs_si_mask;
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extern struct kset *sysaufs_kset;
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extern struct attribute *sysaufs_si_attrs[];
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int sysaufs_si_init(struct au_sbinfo *sbinfo);
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int __init sysaufs_init(void);
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void sysaufs_fin(void);
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/* ---------------------------------------------------------------------- */
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/* some people doesn't like to show a pointer in kernel */
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static inline unsigned long sysaufs_si_id(struct au_sbinfo *sbinfo)
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{
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return sysaufs_si_mask ^ (unsigned long)sbinfo;
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}
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#define SysaufsSiNamePrefix "si_"
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#define SysaufsSiNameLen (sizeof(SysaufsSiNamePrefix) + 16)
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static inline void sysaufs_name(struct au_sbinfo *sbinfo, char *name)
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{
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snprintf(name, SysaufsSiNameLen, SysaufsSiNamePrefix "%lx",
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sysaufs_si_id(sbinfo));
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}
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struct au_branch;
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#ifdef CONFIG_SYSFS
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/* sysfs.c */
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extern struct attribute_group *sysaufs_attr_group;
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int sysaufs_si_xi_path(struct seq_file *seq, struct super_block *sb);
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ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr,
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char *buf);
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long au_brinfo_ioctl(struct file *file, unsigned long arg);
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#ifdef CONFIG_COMPAT
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long au_brinfo_compat_ioctl(struct file *file, unsigned long arg);
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#endif
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void sysaufs_br_init(struct au_branch *br);
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void sysaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex);
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void sysaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex);
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#define sysaufs_brs_init() do {} while (0)
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#else
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#define sysaufs_attr_group NULL
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AuStubInt0(sysaufs_si_xi_path, struct seq_file *seq, struct super_block *sb)
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AuStub(ssize_t, sysaufs_si_show, return 0, struct kobject *kobj,
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struct attribute *attr, char *buf)
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AuStubVoid(sysaufs_br_init, struct au_branch *br)
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AuStubVoid(sysaufs_brs_add, struct super_block *sb, aufs_bindex_t bindex)
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AuStubVoid(sysaufs_brs_del, struct super_block *sb, aufs_bindex_t bindex)
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static inline void sysaufs_brs_init(void)
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{
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sysaufs_brs = 0;
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}
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#endif /* CONFIG_SYSFS */
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#endif /* __KERNEL__ */
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#endif /* __SYSAUFS_H__ */
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