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