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/*
* Copyright (C) 2005-2015 Junjiro R. Okajima
*/
/*
* sysfs interface and lifetime management
* they are necessary regardless sysfs is disabled.
*/
#include <linux/random.h>
#include "aufs.h"
unsigned long sysaufs_si_mask;
struct kset *sysaufs_kset;
#define AuSiAttr(_name) { \
.attr = { .name = __stringify(_name), .mode = 0444 }, \
.show = sysaufs_si_##_name, \
}
static struct sysaufs_si_attr sysaufs_si_attr_xi_path = AuSiAttr(xi_path);
struct attribute *sysaufs_si_attrs[] = {
&sysaufs_si_attr_xi_path.attr,
NULL,
};
static const struct sysfs_ops au_sbi_ops = {
.show = sysaufs_si_show
};
static struct kobj_type au_sbi_ktype = {
.release = au_si_free,
.sysfs_ops = &au_sbi_ops,
.default_attrs = sysaufs_si_attrs
};
/* ---------------------------------------------------------------------- */
int sysaufs_si_init(struct au_sbinfo *sbinfo)
{
int err;
sbinfo->si_kobj.kset = sysaufs_kset;
/* cf. sysaufs_name() */
err = kobject_init_and_add
(&sbinfo->si_kobj, &au_sbi_ktype, /*&sysaufs_kset->kobj*/NULL,
SysaufsSiNamePrefix "%lx", sysaufs_si_id(sbinfo));
dbgaufs_si_null(sbinfo);
if (!err) {
err = dbgaufs_si_init(sbinfo);
if (unlikely(err))
kobject_put(&sbinfo->si_kobj);
}
return err;
}
void sysaufs_fin(void)
{
dbgaufs_fin();
sysfs_remove_group(&sysaufs_kset->kobj, sysaufs_attr_group);
kset_unregister(sysaufs_kset);
}
int __init sysaufs_init(void)
{
int err;
do {
get_random_bytes(&sysaufs_si_mask, sizeof(sysaufs_si_mask));
} while (!sysaufs_si_mask);
err = -EINVAL;
sysaufs_kset = kset_create_and_add(AUFS_NAME, NULL, fs_kobj);
if (unlikely(!sysaufs_kset))
goto out;
err = PTR_ERR(sysaufs_kset);
if (IS_ERR(sysaufs_kset))
goto out;
err = sysfs_create_group(&sysaufs_kset->kobj, sysaufs_attr_group);
if (unlikely(err)) {
kset_unregister(sysaufs_kset);
goto out;
}
err = dbgaufs_init();
if (unlikely(err))
sysaufs_fin();
out:
return err;
}
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