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    Subject[AUFS PATCH v2.6.26-rc2-mm1 09/39] aufs object lifetime management via sysfs
    Date
    From: Junjiro Okajima <hooanon05@yahoo.co.jp>

    initial commit
    some aufs objects have a corresponding entry under sysfs, so the
    lifetime will be managed by struct kref even if CONFIG_SYSFS is
    disabled.
    This file is compiled unconditionally.

    Signed-off-by: Junjiro Okajima <hooanon05@yahoo.co.jp>
    ---
    fs/aufs/sysaufs.c | 102 +++++++++++++++++++++++++++++++++++++++
    fs/aufs/sysaufs.h | 137 +++++++++++++++++++++++++++++++++++++++++++++++++++++
    2 files changed, 239 insertions(+), 0 deletions(-)
    create mode 100644 fs/aufs/sysaufs.c
    create mode 100644 fs/aufs/sysaufs.h
    diff --git a/fs/aufs/sysaufs.c b/fs/aufs/sysaufs.c
    new file mode 100644
    index 0000000..0872b7a
    --- /dev/null
    +++ b/fs/aufs/sysaufs.c
    @@ -0,0 +1,102 @@
    +/*
    + * Copyright (C) 2007-2008 Junjiro 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, write to the Free Software
    + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
    + */
    +
    +/*
    + * sysfs interface and lifetime management
    + * they are necessary regardless sysfs is disabled.
    + */
    +
    +#include <linux/fs.h>
    +#include <linux/module.h>
    +#include <linux/sysfs.h>
    +#include "aufs.h"
    +
    +/* ---------------------------------------------------------------------- */
    +
    +/* super_blocks list is not exported */
    +DEFINE_MUTEX(au_sbilist_mtx);
    +LIST_HEAD(au_sbilist);
    +
    +/* ---------------------------------------------------------------------- */
    +
    +static struct kset au_kset;
    +
    +#define AuSbiAttr(_name) { \
    + .attr = { .name = __stringify(_name), .mode = 0444 }, \
    + .show = sysaufs_sbi_##_name, \
    +}
    +
    +static struct au_sbi_attr au_sbi_attr_xino = AuSbiAttr(xino);
    +struct attribute *au_sbi_attrs[] = {
    + &au_sbi_attr_xino.attr,
    + NULL,
    +};
    +
    +static struct sysfs_ops au_sbi_ops = {
    + .show = sysaufs_sbi_show
    +};
    +
    +static struct kobj_type au_sbi_ktype = {
    + .release = au_si_free,
    + .sysfs_ops = &au_sbi_ops,
    + .default_attrs = au_sbi_attrs,
    +};
    +
    +/* ---------------------------------------------------------------------- */
    +
    +int sysaufs_si_init(struct au_sbinfo *sbinfo)
    +{
    + int err;
    +
    + sbinfo->si_kobj.kset = &au_kset;
    + err = kobject_init_and_add(&sbinfo->si_kobj, &au_sbi_ktype,
    + NULL/*&au_kset.kobj*/,
    + SysaufsSb_PREFIX "%p", sbinfo);
    + AuTraceErr(err);
    + return err;
    +}
    +
    +
    +/* ---------------------------------------------------------------------- */
    +
    +void sysaufs_fin(void)
    +{
    + AuDebugOn(!list_empty(&au_sbilist));
    + sysfs_remove_group(&au_kset.kobj, au_attr_group);
    + kset_unregister(&au_kset);
    +}
    +
    +int __init sysaufs_init(void)
    +{
    + int err;
    +
    + sysaufs_brs_init();
    + au_kset.kobj.parent = fs_kobj;
    + kobject_set_name(&au_kset.kobj, AUFS_NAME);
    + au_kset.kobj.ktype = au_ktype;
    + err = kset_register(&au_kset);
    + if (unlikely(err))
    + goto out;
    + err = sysfs_create_group(&au_kset.kobj, au_attr_group);
    + if (unlikely(err))
    + kset_unregister(&au_kset);
    +
    + out:
    + AuTraceErr(err);
    + return err;
    +}
    diff --git a/fs/aufs/sysaufs.h b/fs/aufs/sysaufs.h
    new file mode 100644
    index 0000000..126f1bd
    --- /dev/null
    +++ b/fs/aufs/sysaufs.h
    @@ -0,0 +1,137 @@
    +/*
    + * Copyright (C) 2007-2008 Junjiro 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, write to the Free Software
    + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
    + */
    +
    +/*
    + * sysfs interface and lifetime management
    + */
    +
    +#ifndef __SYSAUFS_H__
    +#define __SYSAUFS_H__
    +
    +#ifdef __KERNEL__
    +
    +#include <linux/fs.h>
    +#include <linux/sysfs.h>
    +#include "module.h"
    +#include "super.h"
    +
    +#define SysaufsSb_PREFIX "si_" /* followed by %p */
    +
    +struct au_sbi_attr {
    + struct attribute attr;
    + int (*show)(struct seq_file *seq, struct super_block *sb);
    +};
    +
    +/* ---------------------------------------------------------------------- */
    +
    +/* sysaufs.c */
    +extern struct mutex au_sbilist_mtx;
    +extern struct list_head au_sbilist;
    +extern struct attribute *au_sbi_attrs[];
    +int sysaufs_si_init(struct au_sbinfo *sbinfo);
    +int __init sysaufs_init(void);
    +void sysaufs_fin(void);
    +
    +/* ---------------------------------------------------------------------- */
    +
    +static inline void au_sbilist_lock(void)
    +{
    + mutex_lock(&au_sbilist_mtx);
    +}
    +
    +static inline void au_sbilist_unlock(void)
    +{
    + mutex_unlock(&au_sbilist_mtx);
    +}
    +
    +static inline void au_sbilist_del(struct au_sbinfo *sbinfo)
    +{
    + list_del(&sbinfo->si_list);
    +}
    +
    +static inline void au_sbilist_add(struct au_sbinfo *sbinfo)
    +{
    + /* the order in this list is important */
    + list_add_tail(&sbinfo->si_list, &au_sbilist);
    +}
    +
    +/* ---------------------------------------------------------------------- */
    +
    +struct au_branch;
    +#ifdef CONFIG_SYSFS
    +/* sysfs.c */
    +extern struct attribute_group *au_attr_group;
    +extern struct kobj_type *au_ktype;
    +
    +int sysaufs_sbi_xino(struct seq_file *seq, struct super_block *sb);
    +int sysaufs_sbi_mntpnt1(struct seq_file *seq, struct super_block *sb);
    +ssize_t sysaufs_sbi_show(struct kobject *kobj, struct attribute *attr,
    + char *buf);
    +
    +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 au_attr_group NULL
    +#define au_ktype NULL
    +
    +static inline
    +int sysaufs_sbi_xino(struct seq_file *seq, struct super_block *sb)
    +{
    + return 0;
    +}
    +
    +static inline
    +int sysaufs_sbi_mntpnt1(struct seq_file *seq, struct super_block *sb)
    +{
    + return 0;
    +}
    +
    +static inline
    +ssize_t sysaufs_sbi_show(struct kobject *kobj, struct attribute *attr,
    + char *buf)
    +{
    + return 0;
    +}
    +
    +static inline void sysaufs_br_init(struct au_branch *br)
    +{
    + /* empty */
    +}
    +
    +static inline void sysaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex)
    +{
    + /* nothing */
    +}
    +
    +static inline void sysaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex)
    +{
    + /* nothing */
    +}
    +
    +static inline void sysaufs_brs_init(void)
    +{
    + sysaufs_brs = 0;
    +}
    +#endif /* CONFIG_SYSFS */
    +
    +#endif /* __KERNEL__ */
    +#endif /* __SYSAUFS_H__ */
    --
    1.5.5.1.308.g1fbb5.dirty


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