/usr/src/aufs-4.9+20161219/fs/aufs/sysaufs.c is in aufs-dkms 4.9+20161219-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 | /*
* Copyright (C) 2005-2016 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 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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