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by Alessio Igor Bogani
Add new lowlatency kernel flavour |
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/*
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by Luke Yelavich, Andy Whitcroft, Chase Douglas, Eugeni Dodonov, Ingo Molnar, Johannes Berg, John Johansen, Kees Cook, Leann Ogasawara, Robert Hooker, Seth Heasley, Tim Gardner, Luke Yelavich, Upstream Kernel Changes
[ Andy Whitcroft ] |
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* Copyright (C) 2005-2012 Junjiro R. Okajima
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by Alessio Igor Bogani
Add new lowlatency kernel flavour |
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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, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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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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dbgaufs_si_null(sbinfo); |
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if (!err) { |
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err = dbgaufs_si_init(sbinfo); |
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if (unlikely(err)) |
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kobject_put(&sbinfo->si_kobj); |
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}
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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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dbgaufs_fin(); |
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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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goto out; |
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}
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err = dbgaufs_init(); |
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if (unlikely(err)) |
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sysaufs_fin(); |
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out: |
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return err; |
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}
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