/*
* sysfs.c - sysfs support implementation.
*
* Copyright (C) 2005-2014 Nippon Telegraph and Telephone Corporation.
* Copyright (C) 2014 HGST, Inc., a Western Digital Company.
*
* This program 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.
*
* Written by Vyacheslav Dubeyko <Vyacheslav.Dubeyko@hgst.com>
*/
#include <linux/kobject.h>
#include "nilfs.h"
#include "mdt.h"
#include "sufile.h"
#include "cpfile.h"
#include "sysfs.h"
/* /sys/fs/<nilfs>/ */
static struct kset *nilfs_kset;
#define NILFS_SHOW_TIME(time_t_val, buf) ({ \
struct tm res; \
int count = 0; \
time_to_tm(time_t_val, 0, &res); \
res.tm_year += 1900; \
res.tm_mon += 1; \
count = scnprintf(buf, PAGE_SIZE, \
"%ld-%.2d-%.2d %.2d:%.2d:%.2d\n", \
res.tm_year, res.tm_mon, res.tm_mday, \
res.tm_hour, res.tm_min, res.tm_sec);\
count; \
})
/************************************************************************
* NILFS feature attrs *
************************************************************************/
static ssize_t nilfs_feature_revision_show(struct kobject *kobj,
struct attribute *attr, char *buf)
{
return snprintf(buf, PAGE_SIZE, "%d.%d\n",
NILFS_CURRENT_REV, NILFS_MINOR_REV);
}
static const char features_readme_str[] =
"The features group contains attributes that describe NILFS file\n"
"system driver features.\n\n"
"(1) revision\n\tshow current revision of NILFS file system driver.\n";
static ssize_t nilfs_feature_README_show(struct kobject *kobj,
struct attribute *attr,
char *buf)
{
return snprintf(buf, PAGE_SIZE, features_readme_str);
}
NILFS_FEATURE_RO_ATTR(revision);
NILFS_FEATURE_RO_ATTR(README);
static struct attribute *nilfs_feature_attrs[] = {
NILFS_FEATURE_ATTR_LIST(revision),
NILFS_FEATURE_ATTR_LIST(README),
NULL,
};
static const struct attribute_group nilfs_feature_attr_group = {
.name = "features",
.attrs = nilfs_feature_attrs,
};
int __init nilfs_sysfs_init(void)
{
int err;
nilfs_kset = kset_create_and_add(NILFS_ROOT_GROUP_NAME, NULL, fs_kobj);
if (!nilfs_kset) {
err = -ENOMEM;
printk(KERN_ERR "NILFS: unable to create sysfs entry: err %d\n",
err);
goto failed_sysfs_init;
}
err = sysfs_create_group(&nilfs_kset->kobj, &nilfs_feature_attr_group);
if (unlikely(err)) {
printk(KERN_ERR "NILFS: unable to create feature group: err %d\n",
err);
goto cleanup_sysfs_init;
}
return 0;
cleanup_sysfs_init:
kset_unregister(nilfs_kset);
failed_sysfs_init:
return err;
}
void nilfs_sysfs_exit(void)
{
sysfs_remove_group(&nilfs_kset->kobj, &nilfs_feature_attr_group);
kset_unregister(nilfs_kset);
}
