Vyacheslav Dubeyko | aebe17f | 2014-08-08 14:20:37 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * sysfs.c - sysfs support implementation. |
| 3 | * |
| 4 | * Copyright (C) 2005-2014 Nippon Telegraph and Telephone Corporation. |
| 5 | * Copyright (C) 2014 HGST, Inc., a Western Digital Company. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * Written by Vyacheslav Dubeyko <Vyacheslav.Dubeyko@hgst.com> |
| 18 | */ |
| 19 | |
| 20 | #include <linux/kobject.h> |
| 21 | |
| 22 | #include "nilfs.h" |
| 23 | #include "mdt.h" |
| 24 | #include "sufile.h" |
| 25 | #include "cpfile.h" |
| 26 | #include "sysfs.h" |
| 27 | |
| 28 | /* /sys/fs/<nilfs>/ */ |
| 29 | static struct kset *nilfs_kset; |
| 30 | |
| 31 | #define NILFS_SHOW_TIME(time_t_val, buf) ({ \ |
| 32 | struct tm res; \ |
| 33 | int count = 0; \ |
| 34 | time_to_tm(time_t_val, 0, &res); \ |
| 35 | res.tm_year += 1900; \ |
| 36 | res.tm_mon += 1; \ |
| 37 | count = scnprintf(buf, PAGE_SIZE, \ |
| 38 | "%ld-%.2d-%.2d %.2d:%.2d:%.2d\n", \ |
| 39 | res.tm_year, res.tm_mon, res.tm_mday, \ |
| 40 | res.tm_hour, res.tm_min, res.tm_sec);\ |
| 41 | count; \ |
| 42 | }) |
| 43 | |
| 44 | /************************************************************************ |
| 45 | * NILFS feature attrs * |
| 46 | ************************************************************************/ |
| 47 | |
| 48 | static ssize_t nilfs_feature_revision_show(struct kobject *kobj, |
| 49 | struct attribute *attr, char *buf) |
| 50 | { |
| 51 | return snprintf(buf, PAGE_SIZE, "%d.%d\n", |
| 52 | NILFS_CURRENT_REV, NILFS_MINOR_REV); |
| 53 | } |
| 54 | |
| 55 | static const char features_readme_str[] = |
| 56 | "The features group contains attributes that describe NILFS file\n" |
| 57 | "system driver features.\n\n" |
| 58 | "(1) revision\n\tshow current revision of NILFS file system driver.\n"; |
| 59 | |
| 60 | static ssize_t nilfs_feature_README_show(struct kobject *kobj, |
| 61 | struct attribute *attr, |
| 62 | char *buf) |
| 63 | { |
| 64 | return snprintf(buf, PAGE_SIZE, features_readme_str); |
| 65 | } |
| 66 | |
| 67 | NILFS_FEATURE_RO_ATTR(revision); |
| 68 | NILFS_FEATURE_RO_ATTR(README); |
| 69 | |
| 70 | static struct attribute *nilfs_feature_attrs[] = { |
| 71 | NILFS_FEATURE_ATTR_LIST(revision), |
| 72 | NILFS_FEATURE_ATTR_LIST(README), |
| 73 | NULL, |
| 74 | }; |
| 75 | |
| 76 | static const struct attribute_group nilfs_feature_attr_group = { |
| 77 | .name = "features", |
| 78 | .attrs = nilfs_feature_attrs, |
| 79 | }; |
| 80 | |
| 81 | int __init nilfs_sysfs_init(void) |
| 82 | { |
| 83 | int err; |
| 84 | |
| 85 | nilfs_kset = kset_create_and_add(NILFS_ROOT_GROUP_NAME, NULL, fs_kobj); |
| 86 | if (!nilfs_kset) { |
| 87 | err = -ENOMEM; |
| 88 | printk(KERN_ERR "NILFS: unable to create sysfs entry: err %d\n", |
| 89 | err); |
| 90 | goto failed_sysfs_init; |
| 91 | } |
| 92 | |
| 93 | err = sysfs_create_group(&nilfs_kset->kobj, &nilfs_feature_attr_group); |
| 94 | if (unlikely(err)) { |
| 95 | printk(KERN_ERR "NILFS: unable to create feature group: err %d\n", |
| 96 | err); |
| 97 | goto cleanup_sysfs_init; |
| 98 | } |
| 99 | |
| 100 | return 0; |
| 101 | |
| 102 | cleanup_sysfs_init: |
| 103 | kset_unregister(nilfs_kset); |
| 104 | |
| 105 | failed_sysfs_init: |
| 106 | return err; |
| 107 | } |
| 108 | |
| 109 | void nilfs_sysfs_exit(void) |
| 110 | { |
| 111 | sysfs_remove_group(&nilfs_kset->kobj, &nilfs_feature_attr_group); |
| 112 | kset_unregister(nilfs_kset); |
| 113 | } |