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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2005-2019 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 lifetime management
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* they are necessary regardless sysfs is disabled.
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*/
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#include <linux/random.h>
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#include "aufs.h"
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unsigned long sysaufs_si_mask;
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struct kset *sysaufs_kset;
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#define AuSiAttr(_name) { \
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.attr = { .name = __stringify(_name), .mode = 0444 }, \
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.show = sysaufs_si_##_name, \
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}
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static struct sysaufs_si_attr sysaufs_si_attr_xi_path = AuSiAttr(xi_path);
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struct attribute *sysaufs_si_attrs[] = {
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&sysaufs_si_attr_xi_path.attr,
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NULL,
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};
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static const struct sysfs_ops au_sbi_ops = {
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.show = sysaufs_si_show
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};
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static struct kobj_type au_sbi_ktype = {
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.release = au_si_free,
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.sysfs_ops = &au_sbi_ops,
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.default_attrs = sysaufs_si_attrs
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};
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/* ---------------------------------------------------------------------- */
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int sysaufs_si_init(struct au_sbinfo *sbinfo)
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{
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int err;
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sbinfo->si_kobj.kset = sysaufs_kset;
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/* cf. sysaufs_name() */
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err = kobject_init_and_add
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(&sbinfo->si_kobj, &au_sbi_ktype, /*&sysaufs_kset->kobj*/NULL,
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SysaufsSiNamePrefix "%lx", sysaufs_si_id(sbinfo));
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return err;
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}
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void sysaufs_fin(void)
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{
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sysfs_remove_group(&sysaufs_kset->kobj, sysaufs_attr_group);
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kset_unregister(sysaufs_kset);
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}
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int __init sysaufs_init(void)
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{
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int err;
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do {
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get_random_bytes(&sysaufs_si_mask, sizeof(sysaufs_si_mask));
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} while (!sysaufs_si_mask);
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err = -EINVAL;
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sysaufs_kset = kset_create_and_add(AUFS_NAME, NULL, fs_kobj);
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if (unlikely(!sysaufs_kset))
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goto out;
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err = PTR_ERR(sysaufs_kset);
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if (IS_ERR(sysaufs_kset))
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goto out;
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err = sysfs_create_group(&sysaufs_kset->kobj, sysaufs_attr_group);
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if (unlikely(err))
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kset_unregister(sysaufs_kset);
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out:
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return err;
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}
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