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![Vyacheslav Dubeyko](/assets/img/avatar_default.png)
This patch integrates creation of sysfs groups and attributes into NILFS file system driver. It was found the issue with nilfs_sysfs_{create/delete}_snapshot_group functions by Michael L Semon <mlsemon35@gmail.com> in the first version of the patch: BUG: sleeping function called from invalid context at kernel/locking/mutex.c:579 in_atomic(): 1, irqs_disabled(): 0, pid: 32676, name: umount.nilfs2 2 locks held by umount.nilfs2/32676: #0: (&type->s_umount_key#21){++++..}, at: [<790c18e2>] deactivate_super+0x37/0x58 #1: (&(&nilfs->ns_cptree_lock)->rlock){+.+...}, at: [<791bf659>] nilfs_put_root+0x23/0x5a Preemption disabled at:[<791bf659>] nilfs_put_root+0x23/0x5a CPU: 0 PID: 32676 Comm: umount.nilfs2 Not tainted 3.14.0+ #2 Hardware name: Dell Computer Corporation Dimension 2350/07W080, BIOS A01 12/17/2002 Call Trace: dump_stack+0x4b/0x75 __might_sleep+0x111/0x16f mutex_lock_nested+0x1e/0x3ad kernfs_remove+0x12/0x26 sysfs_remove_dir+0x3d/0x62 kobject_del+0x13/0x38 nilfs_sysfs_delete_snapshot_group+0xb/0xd nilfs_put_root+0x2a/0x5a nilfs_detach_log_writer+0x1ab/0x2c1 nilfs_put_super+0x13/0x68 generic_shutdown_super+0x60/0xd1 kill_block_super+0x1d/0x60 deactivate_locked_super+0x22/0x3f deactivate_super+0x3e/0x58 mntput_no_expire+0xe2/0x141 SyS_oldumount+0x70/0xa5 syscall_call+0x7/0xb The reason of the issue was placement of nilfs_sysfs_{create/delete}_snapshot_group() call under nilfs->ns_cptree_lock protection. But this protection is unnecessary and wrong solution. The second version of the patch fixes this issue. [fengguang.wu@intel.com: nilfs_sysfs_create_mounted_snapshots_group can be static] Reported-by: Michael L. Semon <mlsemon35@gmail.com> Signed-off-by: Vyacheslav Dubeyko <Vyacheslav.Dubeyko@hgst.com> Cc: Vyacheslav Dubeyko <slava@dubeyko.com> Cc: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Tested-by: Michael L. Semon <mlsemon35@gmail.com> Signed-off-by: Fengguang Wu <fengguang.wu@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1137 lines
32 KiB
C
1137 lines
32 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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#define NILFS_DEV_INT_GROUP_OPS(name, parent_name) \
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static ssize_t nilfs_##name##_attr_show(struct kobject *kobj, \
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struct attribute *attr, char *buf) \
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{ \
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struct the_nilfs *nilfs = container_of(kobj->parent, \
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struct the_nilfs, \
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ns_##parent_name##_kobj); \
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struct nilfs_##name##_attr *a = container_of(attr, \
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struct nilfs_##name##_attr, \
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attr); \
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return a->show ? a->show(a, nilfs, buf) : 0; \
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} \
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static ssize_t nilfs_##name##_attr_store(struct kobject *kobj, \
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struct attribute *attr, \
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const char *buf, size_t len) \
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{ \
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struct the_nilfs *nilfs = container_of(kobj->parent, \
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struct the_nilfs, \
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ns_##parent_name##_kobj); \
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struct nilfs_##name##_attr *a = container_of(attr, \
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struct nilfs_##name##_attr, \
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attr); \
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return a->store ? a->store(a, nilfs, buf, len) : 0; \
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} \
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static const struct sysfs_ops nilfs_##name##_attr_ops = { \
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.show = nilfs_##name##_attr_show, \
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.store = nilfs_##name##_attr_store, \
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};
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#define NILFS_DEV_INT_GROUP_TYPE(name, parent_name) \
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static void nilfs_##name##_attr_release(struct kobject *kobj) \
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{ \
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struct nilfs_sysfs_##parent_name##_subgroups *subgroups; \
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struct the_nilfs *nilfs = container_of(kobj->parent, \
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struct the_nilfs, \
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ns_##parent_name##_kobj); \
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subgroups = nilfs->ns_##parent_name##_subgroups; \
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complete(&subgroups->sg_##name##_kobj_unregister); \
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} \
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static struct kobj_type nilfs_##name##_ktype = { \
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.default_attrs = nilfs_##name##_attrs, \
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.sysfs_ops = &nilfs_##name##_attr_ops, \
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.release = nilfs_##name##_attr_release, \
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};
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#define NILFS_DEV_INT_GROUP_FNS(name, parent_name) \
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static int nilfs_sysfs_create_##name##_group(struct the_nilfs *nilfs) \
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{ \
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struct kobject *parent; \
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struct kobject *kobj; \
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struct completion *kobj_unregister; \
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struct nilfs_sysfs_##parent_name##_subgroups *subgroups; \
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int err; \
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subgroups = nilfs->ns_##parent_name##_subgroups; \
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kobj = &subgroups->sg_##name##_kobj; \
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kobj_unregister = &subgroups->sg_##name##_kobj_unregister; \
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parent = &nilfs->ns_##parent_name##_kobj; \
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kobj->kset = nilfs_kset; \
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init_completion(kobj_unregister); \
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err = kobject_init_and_add(kobj, &nilfs_##name##_ktype, parent, \
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#name); \
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if (err) \
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return err; \
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return 0; \
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} \
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static void nilfs_sysfs_delete_##name##_group(struct the_nilfs *nilfs) \
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{ \
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kobject_del(&nilfs->ns_##parent_name##_subgroups->sg_##name##_kobj); \
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}
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/************************************************************************
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* NILFS snapshot attrs *
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************************************************************************/
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static ssize_t
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nilfs_snapshot_inodes_count_show(struct nilfs_snapshot_attr *attr,
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struct nilfs_root *root, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%llu\n",
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(unsigned long long)atomic64_read(&root->inodes_count));
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}
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static ssize_t
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nilfs_snapshot_blocks_count_show(struct nilfs_snapshot_attr *attr,
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struct nilfs_root *root, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%llu\n",
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(unsigned long long)atomic64_read(&root->blocks_count));
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}
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static const char snapshot_readme_str[] =
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"The group contains details about mounted snapshot.\n\n"
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"(1) inodes_count\n\tshow number of inodes for snapshot.\n\n"
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"(2) blocks_count\n\tshow number of blocks for snapshot.\n\n";
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static ssize_t
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nilfs_snapshot_README_show(struct nilfs_snapshot_attr *attr,
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struct nilfs_root *root, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, snapshot_readme_str);
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}
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NILFS_SNAPSHOT_RO_ATTR(inodes_count);
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NILFS_SNAPSHOT_RO_ATTR(blocks_count);
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NILFS_SNAPSHOT_RO_ATTR(README);
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static struct attribute *nilfs_snapshot_attrs[] = {
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NILFS_SNAPSHOT_ATTR_LIST(inodes_count),
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NILFS_SNAPSHOT_ATTR_LIST(blocks_count),
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NILFS_SNAPSHOT_ATTR_LIST(README),
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NULL,
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};
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static ssize_t nilfs_snapshot_attr_show(struct kobject *kobj,
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struct attribute *attr, char *buf)
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{
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struct nilfs_root *root =
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container_of(kobj, struct nilfs_root, snapshot_kobj);
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struct nilfs_snapshot_attr *a =
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container_of(attr, struct nilfs_snapshot_attr, attr);
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return a->show ? a->show(a, root, buf) : 0;
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}
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static ssize_t nilfs_snapshot_attr_store(struct kobject *kobj,
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struct attribute *attr,
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const char *buf, size_t len)
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{
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struct nilfs_root *root =
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container_of(kobj, struct nilfs_root, snapshot_kobj);
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struct nilfs_snapshot_attr *a =
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container_of(attr, struct nilfs_snapshot_attr, attr);
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return a->store ? a->store(a, root, buf, len) : 0;
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}
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static void nilfs_snapshot_attr_release(struct kobject *kobj)
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{
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struct nilfs_root *root = container_of(kobj, struct nilfs_root,
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snapshot_kobj);
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complete(&root->snapshot_kobj_unregister);
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}
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static const struct sysfs_ops nilfs_snapshot_attr_ops = {
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.show = nilfs_snapshot_attr_show,
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.store = nilfs_snapshot_attr_store,
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};
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static struct kobj_type nilfs_snapshot_ktype = {
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.default_attrs = nilfs_snapshot_attrs,
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.sysfs_ops = &nilfs_snapshot_attr_ops,
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.release = nilfs_snapshot_attr_release,
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};
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int nilfs_sysfs_create_snapshot_group(struct nilfs_root *root)
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{
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struct the_nilfs *nilfs;
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struct kobject *parent;
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int err;
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nilfs = root->nilfs;
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parent = &nilfs->ns_dev_subgroups->sg_mounted_snapshots_kobj;
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root->snapshot_kobj.kset = nilfs_kset;
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init_completion(&root->snapshot_kobj_unregister);
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if (root->cno == NILFS_CPTREE_CURRENT_CNO) {
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err = kobject_init_and_add(&root->snapshot_kobj,
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&nilfs_snapshot_ktype,
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&nilfs->ns_dev_kobj,
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"current_checkpoint");
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} else {
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err = kobject_init_and_add(&root->snapshot_kobj,
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&nilfs_snapshot_ktype,
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parent,
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"%llu", root->cno);
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}
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if (err)
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return err;
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return 0;
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}
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void nilfs_sysfs_delete_snapshot_group(struct nilfs_root *root)
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{
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kobject_del(&root->snapshot_kobj);
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}
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/************************************************************************
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* NILFS mounted snapshots attrs *
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************************************************************************/
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static const char mounted_snapshots_readme_str[] =
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"The mounted_snapshots group contains group for\n"
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"every mounted snapshot.\n";
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static ssize_t
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nilfs_mounted_snapshots_README_show(struct nilfs_mounted_snapshots_attr *attr,
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struct the_nilfs *nilfs, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, mounted_snapshots_readme_str);
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}
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NILFS_MOUNTED_SNAPSHOTS_RO_ATTR(README);
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static struct attribute *nilfs_mounted_snapshots_attrs[] = {
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NILFS_MOUNTED_SNAPSHOTS_ATTR_LIST(README),
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NULL,
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};
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NILFS_DEV_INT_GROUP_OPS(mounted_snapshots, dev);
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NILFS_DEV_INT_GROUP_TYPE(mounted_snapshots, dev);
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NILFS_DEV_INT_GROUP_FNS(mounted_snapshots, dev);
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/************************************************************************
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* NILFS checkpoints attrs *
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************************************************************************/
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static ssize_t
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nilfs_checkpoints_checkpoints_number_show(struct nilfs_checkpoints_attr *attr,
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struct the_nilfs *nilfs,
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char *buf)
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{
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__u64 ncheckpoints;
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struct nilfs_cpstat cpstat;
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int err;
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down_read(&nilfs->ns_segctor_sem);
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err = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
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up_read(&nilfs->ns_segctor_sem);
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if (err < 0) {
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printk(KERN_ERR "NILFS: unable to get checkpoint stat: err=%d\n",
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err);
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return err;
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}
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ncheckpoints = cpstat.cs_ncps;
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return snprintf(buf, PAGE_SIZE, "%llu\n", ncheckpoints);
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}
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static ssize_t
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nilfs_checkpoints_snapshots_number_show(struct nilfs_checkpoints_attr *attr,
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struct the_nilfs *nilfs,
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char *buf)
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{
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__u64 nsnapshots;
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struct nilfs_cpstat cpstat;
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int err;
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down_read(&nilfs->ns_segctor_sem);
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err = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
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up_read(&nilfs->ns_segctor_sem);
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if (err < 0) {
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printk(KERN_ERR "NILFS: unable to get checkpoint stat: err=%d\n",
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err);
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return err;
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}
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nsnapshots = cpstat.cs_nsss;
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return snprintf(buf, PAGE_SIZE, "%llu\n", nsnapshots);
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}
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static ssize_t
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nilfs_checkpoints_last_seg_checkpoint_show(struct nilfs_checkpoints_attr *attr,
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struct the_nilfs *nilfs,
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char *buf)
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{
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__u64 last_cno;
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spin_lock(&nilfs->ns_last_segment_lock);
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last_cno = nilfs->ns_last_cno;
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spin_unlock(&nilfs->ns_last_segment_lock);
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return snprintf(buf, PAGE_SIZE, "%llu\n", last_cno);
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}
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static ssize_t
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nilfs_checkpoints_next_checkpoint_show(struct nilfs_checkpoints_attr *attr,
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struct the_nilfs *nilfs,
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char *buf)
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{
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__u64 cno;
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down_read(&nilfs->ns_sem);
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cno = nilfs->ns_cno;
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up_read(&nilfs->ns_sem);
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return snprintf(buf, PAGE_SIZE, "%llu\n", cno);
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}
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static const char checkpoints_readme_str[] =
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"The checkpoints group contains attributes that describe\n"
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"details about volume's checkpoints.\n\n"
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"(1) checkpoints_number\n\tshow number of checkpoints on volume.\n\n"
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"(2) snapshots_number\n\tshow number of snapshots on volume.\n\n"
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"(3) last_seg_checkpoint\n"
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"\tshow checkpoint number of the latest segment.\n\n"
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"(4) next_checkpoint\n\tshow next checkpoint number.\n\n";
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static ssize_t
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nilfs_checkpoints_README_show(struct nilfs_checkpoints_attr *attr,
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struct the_nilfs *nilfs, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, checkpoints_readme_str);
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}
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NILFS_CHECKPOINTS_RO_ATTR(checkpoints_number);
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NILFS_CHECKPOINTS_RO_ATTR(snapshots_number);
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NILFS_CHECKPOINTS_RO_ATTR(last_seg_checkpoint);
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NILFS_CHECKPOINTS_RO_ATTR(next_checkpoint);
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NILFS_CHECKPOINTS_RO_ATTR(README);
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static struct attribute *nilfs_checkpoints_attrs[] = {
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NILFS_CHECKPOINTS_ATTR_LIST(checkpoints_number),
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NILFS_CHECKPOINTS_ATTR_LIST(snapshots_number),
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NILFS_CHECKPOINTS_ATTR_LIST(last_seg_checkpoint),
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NILFS_CHECKPOINTS_ATTR_LIST(next_checkpoint),
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NILFS_CHECKPOINTS_ATTR_LIST(README),
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NULL,
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};
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NILFS_DEV_INT_GROUP_OPS(checkpoints, dev);
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NILFS_DEV_INT_GROUP_TYPE(checkpoints, dev);
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NILFS_DEV_INT_GROUP_FNS(checkpoints, dev);
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/************************************************************************
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* NILFS segments attrs *
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************************************************************************/
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static ssize_t
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nilfs_segments_segments_number_show(struct nilfs_segments_attr *attr,
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struct the_nilfs *nilfs,
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char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%lu\n", nilfs->ns_nsegments);
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}
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static ssize_t
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nilfs_segments_blocks_per_segment_show(struct nilfs_segments_attr *attr,
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struct the_nilfs *nilfs,
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char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%lu\n", nilfs->ns_blocks_per_segment);
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}
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static ssize_t
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nilfs_segments_clean_segments_show(struct nilfs_segments_attr *attr,
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struct the_nilfs *nilfs,
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char *buf)
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{
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unsigned long ncleansegs;
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down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
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ncleansegs = nilfs_sufile_get_ncleansegs(nilfs->ns_sufile);
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up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
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return snprintf(buf, PAGE_SIZE, "%lu\n", ncleansegs);
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}
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static ssize_t
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nilfs_segments_dirty_segments_show(struct nilfs_segments_attr *attr,
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struct the_nilfs *nilfs,
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char *buf)
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{
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struct nilfs_sustat sustat;
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int err;
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down_read(&nilfs->ns_segctor_sem);
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err = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
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up_read(&nilfs->ns_segctor_sem);
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if (err < 0) {
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printk(KERN_ERR "NILFS: unable to get segment stat: err=%d\n",
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err);
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return err;
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}
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|
|
return snprintf(buf, PAGE_SIZE, "%llu\n", sustat.ss_ndirtysegs);
|
|
}
|
|
|
|
static const char segments_readme_str[] =
|
|
"The segments group contains attributes that describe\n"
|
|
"details about volume's segments.\n\n"
|
|
"(1) segments_number\n\tshow number of segments on volume.\n\n"
|
|
"(2) blocks_per_segment\n\tshow number of blocks in segment.\n\n"
|
|
"(3) clean_segments\n\tshow count of clean segments.\n\n"
|
|
"(4) dirty_segments\n\tshow count of dirty segments.\n\n";
|
|
|
|
static ssize_t
|
|
nilfs_segments_README_show(struct nilfs_segments_attr *attr,
|
|
struct the_nilfs *nilfs,
|
|
char *buf)
|
|
{
|
|
return snprintf(buf, PAGE_SIZE, segments_readme_str);
|
|
}
|
|
|
|
NILFS_SEGMENTS_RO_ATTR(segments_number);
|
|
NILFS_SEGMENTS_RO_ATTR(blocks_per_segment);
|
|
NILFS_SEGMENTS_RO_ATTR(clean_segments);
|
|
NILFS_SEGMENTS_RO_ATTR(dirty_segments);
|
|
NILFS_SEGMENTS_RO_ATTR(README);
|
|
|
|
static struct attribute *nilfs_segments_attrs[] = {
|
|
NILFS_SEGMENTS_ATTR_LIST(segments_number),
|
|
NILFS_SEGMENTS_ATTR_LIST(blocks_per_segment),
|
|
NILFS_SEGMENTS_ATTR_LIST(clean_segments),
|
|
NILFS_SEGMENTS_ATTR_LIST(dirty_segments),
|
|
NILFS_SEGMENTS_ATTR_LIST(README),
|
|
NULL,
|
|
};
|
|
|
|
NILFS_DEV_INT_GROUP_OPS(segments, dev);
|
|
NILFS_DEV_INT_GROUP_TYPE(segments, dev);
|
|
NILFS_DEV_INT_GROUP_FNS(segments, dev);
|
|
|
|
/************************************************************************
|
|
* NILFS segctor attrs *
|
|
************************************************************************/
|
|
|
|
static ssize_t
|
|
nilfs_segctor_last_pseg_block_show(struct nilfs_segctor_attr *attr,
|
|
struct the_nilfs *nilfs,
|
|
char *buf)
|
|
{
|
|
sector_t last_pseg;
|
|
|
|
spin_lock(&nilfs->ns_last_segment_lock);
|
|
last_pseg = nilfs->ns_last_pseg;
|
|
spin_unlock(&nilfs->ns_last_segment_lock);
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%llu\n",
|
|
(unsigned long long)last_pseg);
|
|
}
|
|
|
|
static ssize_t
|
|
nilfs_segctor_last_seg_sequence_show(struct nilfs_segctor_attr *attr,
|
|
struct the_nilfs *nilfs,
|
|
char *buf)
|
|
{
|
|
u64 last_seq;
|
|
|
|
spin_lock(&nilfs->ns_last_segment_lock);
|
|
last_seq = nilfs->ns_last_seq;
|
|
spin_unlock(&nilfs->ns_last_segment_lock);
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%llu\n", last_seq);
|
|
}
|
|
|
|
static ssize_t
|
|
nilfs_segctor_last_seg_checkpoint_show(struct nilfs_segctor_attr *attr,
|
|
struct the_nilfs *nilfs,
|
|
char *buf)
|
|
{
|
|
__u64 last_cno;
|
|
|
|
spin_lock(&nilfs->ns_last_segment_lock);
|
|
last_cno = nilfs->ns_last_cno;
|
|
spin_unlock(&nilfs->ns_last_segment_lock);
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%llu\n", last_cno);
|
|
}
|
|
|
|
static ssize_t
|
|
nilfs_segctor_current_seg_sequence_show(struct nilfs_segctor_attr *attr,
|
|
struct the_nilfs *nilfs,
|
|
char *buf)
|
|
{
|
|
u64 seg_seq;
|
|
|
|
down_read(&nilfs->ns_sem);
|
|
seg_seq = nilfs->ns_seg_seq;
|
|
up_read(&nilfs->ns_sem);
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%llu\n", seg_seq);
|
|
}
|
|
|
|
static ssize_t
|
|
nilfs_segctor_current_last_full_seg_show(struct nilfs_segctor_attr *attr,
|
|
struct the_nilfs *nilfs,
|
|
char *buf)
|
|
{
|
|
__u64 segnum;
|
|
|
|
down_read(&nilfs->ns_sem);
|
|
segnum = nilfs->ns_segnum;
|
|
up_read(&nilfs->ns_sem);
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%llu\n", segnum);
|
|
}
|
|
|
|
static ssize_t
|
|
nilfs_segctor_next_full_seg_show(struct nilfs_segctor_attr *attr,
|
|
struct the_nilfs *nilfs,
|
|
char *buf)
|
|
{
|
|
__u64 nextnum;
|
|
|
|
down_read(&nilfs->ns_sem);
|
|
nextnum = nilfs->ns_nextnum;
|
|
up_read(&nilfs->ns_sem);
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%llu\n", nextnum);
|
|
}
|
|
|
|
static ssize_t
|
|
nilfs_segctor_next_pseg_offset_show(struct nilfs_segctor_attr *attr,
|
|
struct the_nilfs *nilfs,
|
|
char *buf)
|
|
{
|
|
unsigned long pseg_offset;
|
|
|
|
down_read(&nilfs->ns_sem);
|
|
pseg_offset = nilfs->ns_pseg_offset;
|
|
up_read(&nilfs->ns_sem);
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%lu\n", pseg_offset);
|
|
}
|
|
|
|
static ssize_t
|
|
nilfs_segctor_next_checkpoint_show(struct nilfs_segctor_attr *attr,
|
|
struct the_nilfs *nilfs,
|
|
char *buf)
|
|
{
|
|
__u64 cno;
|
|
|
|
down_read(&nilfs->ns_sem);
|
|
cno = nilfs->ns_cno;
|
|
up_read(&nilfs->ns_sem);
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%llu\n", cno);
|
|
}
|
|
|
|
static ssize_t
|
|
nilfs_segctor_last_seg_write_time_show(struct nilfs_segctor_attr *attr,
|
|
struct the_nilfs *nilfs,
|
|
char *buf)
|
|
{
|
|
time_t ctime;
|
|
|
|
down_read(&nilfs->ns_sem);
|
|
ctime = nilfs->ns_ctime;
|
|
up_read(&nilfs->ns_sem);
|
|
|
|
return NILFS_SHOW_TIME(ctime, buf);
|
|
}
|
|
|
|
static ssize_t
|
|
nilfs_segctor_last_seg_write_time_secs_show(struct nilfs_segctor_attr *attr,
|
|
struct the_nilfs *nilfs,
|
|
char *buf)
|
|
{
|
|
time_t ctime;
|
|
|
|
down_read(&nilfs->ns_sem);
|
|
ctime = nilfs->ns_ctime;
|
|
up_read(&nilfs->ns_sem);
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%llu\n", (unsigned long long)ctime);
|
|
}
|
|
|
|
static ssize_t
|
|
nilfs_segctor_last_nongc_write_time_show(struct nilfs_segctor_attr *attr,
|
|
struct the_nilfs *nilfs,
|
|
char *buf)
|
|
{
|
|
time_t nongc_ctime;
|
|
|
|
down_read(&nilfs->ns_sem);
|
|
nongc_ctime = nilfs->ns_nongc_ctime;
|
|
up_read(&nilfs->ns_sem);
|
|
|
|
return NILFS_SHOW_TIME(nongc_ctime, buf);
|
|
}
|
|
|
|
static ssize_t
|
|
nilfs_segctor_last_nongc_write_time_secs_show(struct nilfs_segctor_attr *attr,
|
|
struct the_nilfs *nilfs,
|
|
char *buf)
|
|
{
|
|
time_t nongc_ctime;
|
|
|
|
down_read(&nilfs->ns_sem);
|
|
nongc_ctime = nilfs->ns_nongc_ctime;
|
|
up_read(&nilfs->ns_sem);
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%llu\n",
|
|
(unsigned long long)nongc_ctime);
|
|
}
|
|
|
|
static ssize_t
|
|
nilfs_segctor_dirty_data_blocks_count_show(struct nilfs_segctor_attr *attr,
|
|
struct the_nilfs *nilfs,
|
|
char *buf)
|
|
{
|
|
u32 ndirtyblks;
|
|
|
|
down_read(&nilfs->ns_sem);
|
|
ndirtyblks = atomic_read(&nilfs->ns_ndirtyblks);
|
|
up_read(&nilfs->ns_sem);
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%u\n", ndirtyblks);
|
|
}
|
|
|
|
static const char segctor_readme_str[] =
|
|
"The segctor group contains attributes that describe\n"
|
|
"segctor thread activity details.\n\n"
|
|
"(1) last_pseg_block\n"
|
|
"\tshow start block number of the latest segment.\n\n"
|
|
"(2) last_seg_sequence\n"
|
|
"\tshow sequence value of the latest segment.\n\n"
|
|
"(3) last_seg_checkpoint\n"
|
|
"\tshow checkpoint number of the latest segment.\n\n"
|
|
"(4) current_seg_sequence\n\tshow segment sequence counter.\n\n"
|
|
"(5) current_last_full_seg\n"
|
|
"\tshow index number of the latest full segment.\n\n"
|
|
"(6) next_full_seg\n"
|
|
"\tshow index number of the full segment index to be used next.\n\n"
|
|
"(7) next_pseg_offset\n"
|
|
"\tshow offset of next partial segment in the current full segment.\n\n"
|
|
"(8) next_checkpoint\n\tshow next checkpoint number.\n\n"
|
|
"(9) last_seg_write_time\n"
|
|
"\tshow write time of the last segment in human-readable format.\n\n"
|
|
"(10) last_seg_write_time_secs\n"
|
|
"\tshow write time of the last segment in seconds.\n\n"
|
|
"(11) last_nongc_write_time\n"
|
|
"\tshow write time of the last segment not for cleaner operation "
|
|
"in human-readable format.\n\n"
|
|
"(12) last_nongc_write_time_secs\n"
|
|
"\tshow write time of the last segment not for cleaner operation "
|
|
"in seconds.\n\n"
|
|
"(13) dirty_data_blocks_count\n"
|
|
"\tshow number of dirty data blocks.\n\n";
|
|
|
|
static ssize_t
|
|
nilfs_segctor_README_show(struct nilfs_segctor_attr *attr,
|
|
struct the_nilfs *nilfs, char *buf)
|
|
{
|
|
return snprintf(buf, PAGE_SIZE, segctor_readme_str);
|
|
}
|
|
|
|
NILFS_SEGCTOR_RO_ATTR(last_pseg_block);
|
|
NILFS_SEGCTOR_RO_ATTR(last_seg_sequence);
|
|
NILFS_SEGCTOR_RO_ATTR(last_seg_checkpoint);
|
|
NILFS_SEGCTOR_RO_ATTR(current_seg_sequence);
|
|
NILFS_SEGCTOR_RO_ATTR(current_last_full_seg);
|
|
NILFS_SEGCTOR_RO_ATTR(next_full_seg);
|
|
NILFS_SEGCTOR_RO_ATTR(next_pseg_offset);
|
|
NILFS_SEGCTOR_RO_ATTR(next_checkpoint);
|
|
NILFS_SEGCTOR_RO_ATTR(last_seg_write_time);
|
|
NILFS_SEGCTOR_RO_ATTR(last_seg_write_time_secs);
|
|
NILFS_SEGCTOR_RO_ATTR(last_nongc_write_time);
|
|
NILFS_SEGCTOR_RO_ATTR(last_nongc_write_time_secs);
|
|
NILFS_SEGCTOR_RO_ATTR(dirty_data_blocks_count);
|
|
NILFS_SEGCTOR_RO_ATTR(README);
|
|
|
|
static struct attribute *nilfs_segctor_attrs[] = {
|
|
NILFS_SEGCTOR_ATTR_LIST(last_pseg_block),
|
|
NILFS_SEGCTOR_ATTR_LIST(last_seg_sequence),
|
|
NILFS_SEGCTOR_ATTR_LIST(last_seg_checkpoint),
|
|
NILFS_SEGCTOR_ATTR_LIST(current_seg_sequence),
|
|
NILFS_SEGCTOR_ATTR_LIST(current_last_full_seg),
|
|
NILFS_SEGCTOR_ATTR_LIST(next_full_seg),
|
|
NILFS_SEGCTOR_ATTR_LIST(next_pseg_offset),
|
|
NILFS_SEGCTOR_ATTR_LIST(next_checkpoint),
|
|
NILFS_SEGCTOR_ATTR_LIST(last_seg_write_time),
|
|
NILFS_SEGCTOR_ATTR_LIST(last_seg_write_time_secs),
|
|
NILFS_SEGCTOR_ATTR_LIST(last_nongc_write_time),
|
|
NILFS_SEGCTOR_ATTR_LIST(last_nongc_write_time_secs),
|
|
NILFS_SEGCTOR_ATTR_LIST(dirty_data_blocks_count),
|
|
NILFS_SEGCTOR_ATTR_LIST(README),
|
|
NULL,
|
|
};
|
|
|
|
NILFS_DEV_INT_GROUP_OPS(segctor, dev);
|
|
NILFS_DEV_INT_GROUP_TYPE(segctor, dev);
|
|
NILFS_DEV_INT_GROUP_FNS(segctor, dev);
|
|
|
|
/************************************************************************
|
|
* NILFS superblock attrs *
|
|
************************************************************************/
|
|
|
|
static ssize_t
|
|
nilfs_superblock_sb_write_time_show(struct nilfs_superblock_attr *attr,
|
|
struct the_nilfs *nilfs,
|
|
char *buf)
|
|
{
|
|
time_t sbwtime;
|
|
|
|
down_read(&nilfs->ns_sem);
|
|
sbwtime = nilfs->ns_sbwtime;
|
|
up_read(&nilfs->ns_sem);
|
|
|
|
return NILFS_SHOW_TIME(sbwtime, buf);
|
|
}
|
|
|
|
static ssize_t
|
|
nilfs_superblock_sb_write_time_secs_show(struct nilfs_superblock_attr *attr,
|
|
struct the_nilfs *nilfs,
|
|
char *buf)
|
|
{
|
|
time_t sbwtime;
|
|
|
|
down_read(&nilfs->ns_sem);
|
|
sbwtime = nilfs->ns_sbwtime;
|
|
up_read(&nilfs->ns_sem);
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%llu\n", (unsigned long long)sbwtime);
|
|
}
|
|
|
|
static ssize_t
|
|
nilfs_superblock_sb_write_count_show(struct nilfs_superblock_attr *attr,
|
|
struct the_nilfs *nilfs,
|
|
char *buf)
|
|
{
|
|
unsigned sbwcount;
|
|
|
|
down_read(&nilfs->ns_sem);
|
|
sbwcount = nilfs->ns_sbwcount;
|
|
up_read(&nilfs->ns_sem);
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%u\n", sbwcount);
|
|
}
|
|
|
|
static ssize_t
|
|
nilfs_superblock_sb_update_frequency_show(struct nilfs_superblock_attr *attr,
|
|
struct the_nilfs *nilfs,
|
|
char *buf)
|
|
{
|
|
unsigned sb_update_freq;
|
|
|
|
down_read(&nilfs->ns_sem);
|
|
sb_update_freq = nilfs->ns_sb_update_freq;
|
|
up_read(&nilfs->ns_sem);
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%u\n", sb_update_freq);
|
|
}
|
|
|
|
static ssize_t
|
|
nilfs_superblock_sb_update_frequency_store(struct nilfs_superblock_attr *attr,
|
|
struct the_nilfs *nilfs,
|
|
const char *buf, size_t count)
|
|
{
|
|
unsigned val;
|
|
int err;
|
|
|
|
err = kstrtouint(skip_spaces(buf), 0, &val);
|
|
if (err) {
|
|
printk(KERN_ERR "NILFS: unable to convert string: err=%d\n",
|
|
err);
|
|
return err;
|
|
}
|
|
|
|
if (val < NILFS_SB_FREQ) {
|
|
val = NILFS_SB_FREQ;
|
|
printk(KERN_WARNING "NILFS: superblock update frequency cannot be lesser than 10 seconds\n");
|
|
}
|
|
|
|
down_write(&nilfs->ns_sem);
|
|
nilfs->ns_sb_update_freq = val;
|
|
up_write(&nilfs->ns_sem);
|
|
|
|
return count;
|
|
}
|
|
|
|
static const char sb_readme_str[] =
|
|
"The superblock group contains attributes that describe\n"
|
|
"superblock's details.\n\n"
|
|
"(1) sb_write_time\n\tshow previous write time of super block "
|
|
"in human-readable format.\n\n"
|
|
"(2) sb_write_time_secs\n\tshow previous write time of super block "
|
|
"in seconds.\n\n"
|
|
"(3) sb_write_count\n\tshow write count of super block.\n\n"
|
|
"(4) sb_update_frequency\n"
|
|
"\tshow/set interval of periodical update of superblock (in seconds).\n\n"
|
|
"\tYou can set preferable frequency of superblock update by command:\n\n"
|
|
"\t'echo <val> > /sys/fs/<nilfs>/<dev>/superblock/sb_update_frequency'\n";
|
|
|
|
static ssize_t
|
|
nilfs_superblock_README_show(struct nilfs_superblock_attr *attr,
|
|
struct the_nilfs *nilfs, char *buf)
|
|
{
|
|
return snprintf(buf, PAGE_SIZE, sb_readme_str);
|
|
}
|
|
|
|
NILFS_SUPERBLOCK_RO_ATTR(sb_write_time);
|
|
NILFS_SUPERBLOCK_RO_ATTR(sb_write_time_secs);
|
|
NILFS_SUPERBLOCK_RO_ATTR(sb_write_count);
|
|
NILFS_SUPERBLOCK_RW_ATTR(sb_update_frequency);
|
|
NILFS_SUPERBLOCK_RO_ATTR(README);
|
|
|
|
static struct attribute *nilfs_superblock_attrs[] = {
|
|
NILFS_SUPERBLOCK_ATTR_LIST(sb_write_time),
|
|
NILFS_SUPERBLOCK_ATTR_LIST(sb_write_time_secs),
|
|
NILFS_SUPERBLOCK_ATTR_LIST(sb_write_count),
|
|
NILFS_SUPERBLOCK_ATTR_LIST(sb_update_frequency),
|
|
NILFS_SUPERBLOCK_ATTR_LIST(README),
|
|
NULL,
|
|
};
|
|
|
|
NILFS_DEV_INT_GROUP_OPS(superblock, dev);
|
|
NILFS_DEV_INT_GROUP_TYPE(superblock, dev);
|
|
NILFS_DEV_INT_GROUP_FNS(superblock, dev);
|
|
|
|
/************************************************************************
|
|
* NILFS device attrs *
|
|
************************************************************************/
|
|
|
|
static
|
|
ssize_t nilfs_dev_revision_show(struct nilfs_dev_attr *attr,
|
|
struct the_nilfs *nilfs,
|
|
char *buf)
|
|
{
|
|
struct nilfs_super_block **sbp = nilfs->ns_sbp;
|
|
u32 major = le32_to_cpu(sbp[0]->s_rev_level);
|
|
u16 minor = le16_to_cpu(sbp[0]->s_minor_rev_level);
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%d.%d\n", major, minor);
|
|
}
|
|
|
|
static
|
|
ssize_t nilfs_dev_blocksize_show(struct nilfs_dev_attr *attr,
|
|
struct the_nilfs *nilfs,
|
|
char *buf)
|
|
{
|
|
return snprintf(buf, PAGE_SIZE, "%u\n", nilfs->ns_blocksize);
|
|
}
|
|
|
|
static
|
|
ssize_t nilfs_dev_device_size_show(struct nilfs_dev_attr *attr,
|
|
struct the_nilfs *nilfs,
|
|
char *buf)
|
|
{
|
|
struct nilfs_super_block **sbp = nilfs->ns_sbp;
|
|
u64 dev_size = le64_to_cpu(sbp[0]->s_dev_size);
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%llu\n", dev_size);
|
|
}
|
|
|
|
static
|
|
ssize_t nilfs_dev_free_blocks_show(struct nilfs_dev_attr *attr,
|
|
struct the_nilfs *nilfs,
|
|
char *buf)
|
|
{
|
|
sector_t free_blocks = 0;
|
|
|
|
nilfs_count_free_blocks(nilfs, &free_blocks);
|
|
return snprintf(buf, PAGE_SIZE, "%llu\n",
|
|
(unsigned long long)free_blocks);
|
|
}
|
|
|
|
static
|
|
ssize_t nilfs_dev_uuid_show(struct nilfs_dev_attr *attr,
|
|
struct the_nilfs *nilfs,
|
|
char *buf)
|
|
{
|
|
struct nilfs_super_block **sbp = nilfs->ns_sbp;
|
|
|
|
return snprintf(buf, PAGE_SIZE, "%pUb\n", sbp[0]->s_uuid);
|
|
}
|
|
|
|
static
|
|
ssize_t nilfs_dev_volume_name_show(struct nilfs_dev_attr *attr,
|
|
struct the_nilfs *nilfs,
|
|
char *buf)
|
|
{
|
|
struct nilfs_super_block **sbp = nilfs->ns_sbp;
|
|
|
|
return scnprintf(buf, sizeof(sbp[0]->s_volume_name), "%s\n",
|
|
sbp[0]->s_volume_name);
|
|
}
|
|
|
|
static const char dev_readme_str[] =
|
|
"The <device> group contains attributes that describe file system\n"
|
|
"partition's details.\n\n"
|
|
"(1) revision\n\tshow NILFS file system revision.\n\n"
|
|
"(2) blocksize\n\tshow volume block size in bytes.\n\n"
|
|
"(3) device_size\n\tshow volume size in bytes.\n\n"
|
|
"(4) free_blocks\n\tshow count of free blocks on volume.\n\n"
|
|
"(5) uuid\n\tshow volume's UUID.\n\n"
|
|
"(6) volume_name\n\tshow volume's name.\n\n";
|
|
|
|
static ssize_t nilfs_dev_README_show(struct nilfs_dev_attr *attr,
|
|
struct the_nilfs *nilfs,
|
|
char *buf)
|
|
{
|
|
return snprintf(buf, PAGE_SIZE, dev_readme_str);
|
|
}
|
|
|
|
NILFS_DEV_RO_ATTR(revision);
|
|
NILFS_DEV_RO_ATTR(blocksize);
|
|
NILFS_DEV_RO_ATTR(device_size);
|
|
NILFS_DEV_RO_ATTR(free_blocks);
|
|
NILFS_DEV_RO_ATTR(uuid);
|
|
NILFS_DEV_RO_ATTR(volume_name);
|
|
NILFS_DEV_RO_ATTR(README);
|
|
|
|
static struct attribute *nilfs_dev_attrs[] = {
|
|
NILFS_DEV_ATTR_LIST(revision),
|
|
NILFS_DEV_ATTR_LIST(blocksize),
|
|
NILFS_DEV_ATTR_LIST(device_size),
|
|
NILFS_DEV_ATTR_LIST(free_blocks),
|
|
NILFS_DEV_ATTR_LIST(uuid),
|
|
NILFS_DEV_ATTR_LIST(volume_name),
|
|
NILFS_DEV_ATTR_LIST(README),
|
|
NULL,
|
|
};
|
|
|
|
static ssize_t nilfs_dev_attr_show(struct kobject *kobj,
|
|
struct attribute *attr, char *buf)
|
|
{
|
|
struct the_nilfs *nilfs = container_of(kobj, struct the_nilfs,
|
|
ns_dev_kobj);
|
|
struct nilfs_dev_attr *a = container_of(attr, struct nilfs_dev_attr,
|
|
attr);
|
|
|
|
return a->show ? a->show(a, nilfs, buf) : 0;
|
|
}
|
|
|
|
static ssize_t nilfs_dev_attr_store(struct kobject *kobj,
|
|
struct attribute *attr,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct the_nilfs *nilfs = container_of(kobj, struct the_nilfs,
|
|
ns_dev_kobj);
|
|
struct nilfs_dev_attr *a = container_of(attr, struct nilfs_dev_attr,
|
|
attr);
|
|
|
|
return a->store ? a->store(a, nilfs, buf, len) : 0;
|
|
}
|
|
|
|
static void nilfs_dev_attr_release(struct kobject *kobj)
|
|
{
|
|
struct the_nilfs *nilfs = container_of(kobj, struct the_nilfs,
|
|
ns_dev_kobj);
|
|
complete(&nilfs->ns_dev_kobj_unregister);
|
|
}
|
|
|
|
static const struct sysfs_ops nilfs_dev_attr_ops = {
|
|
.show = nilfs_dev_attr_show,
|
|
.store = nilfs_dev_attr_store,
|
|
};
|
|
|
|
static struct kobj_type nilfs_dev_ktype = {
|
|
.default_attrs = nilfs_dev_attrs,
|
|
.sysfs_ops = &nilfs_dev_attr_ops,
|
|
.release = nilfs_dev_attr_release,
|
|
};
|
|
|
|
int nilfs_sysfs_create_device_group(struct super_block *sb)
|
|
{
|
|
struct the_nilfs *nilfs = sb->s_fs_info;
|
|
size_t devgrp_size = sizeof(struct nilfs_sysfs_dev_subgroups);
|
|
int err;
|
|
|
|
nilfs->ns_dev_subgroups = kzalloc(devgrp_size, GFP_KERNEL);
|
|
if (unlikely(!nilfs->ns_dev_subgroups)) {
|
|
err = -ENOMEM;
|
|
printk(KERN_ERR "NILFS: unable to allocate memory for device group\n");
|
|
goto failed_create_device_group;
|
|
}
|
|
|
|
nilfs->ns_dev_kobj.kset = nilfs_kset;
|
|
init_completion(&nilfs->ns_dev_kobj_unregister);
|
|
err = kobject_init_and_add(&nilfs->ns_dev_kobj, &nilfs_dev_ktype, NULL,
|
|
"%s", sb->s_id);
|
|
if (err)
|
|
goto free_dev_subgroups;
|
|
|
|
err = nilfs_sysfs_create_mounted_snapshots_group(nilfs);
|
|
if (err)
|
|
goto cleanup_dev_kobject;
|
|
|
|
err = nilfs_sysfs_create_checkpoints_group(nilfs);
|
|
if (err)
|
|
goto delete_mounted_snapshots_group;
|
|
|
|
err = nilfs_sysfs_create_segments_group(nilfs);
|
|
if (err)
|
|
goto delete_checkpoints_group;
|
|
|
|
err = nilfs_sysfs_create_superblock_group(nilfs);
|
|
if (err)
|
|
goto delete_segments_group;
|
|
|
|
err = nilfs_sysfs_create_segctor_group(nilfs);
|
|
if (err)
|
|
goto delete_superblock_group;
|
|
|
|
return 0;
|
|
|
|
delete_superblock_group:
|
|
nilfs_sysfs_delete_superblock_group(nilfs);
|
|
|
|
delete_segments_group:
|
|
nilfs_sysfs_delete_segments_group(nilfs);
|
|
|
|
delete_checkpoints_group:
|
|
nilfs_sysfs_delete_checkpoints_group(nilfs);
|
|
|
|
delete_mounted_snapshots_group:
|
|
nilfs_sysfs_delete_mounted_snapshots_group(nilfs);
|
|
|
|
cleanup_dev_kobject:
|
|
kobject_del(&nilfs->ns_dev_kobj);
|
|
|
|
free_dev_subgroups:
|
|
kfree(nilfs->ns_dev_subgroups);
|
|
|
|
failed_create_device_group:
|
|
return err;
|
|
}
|
|
|
|
void nilfs_sysfs_delete_device_group(struct the_nilfs *nilfs)
|
|
{
|
|
nilfs_sysfs_delete_mounted_snapshots_group(nilfs);
|
|
nilfs_sysfs_delete_checkpoints_group(nilfs);
|
|
nilfs_sysfs_delete_segments_group(nilfs);
|
|
nilfs_sysfs_delete_superblock_group(nilfs);
|
|
nilfs_sysfs_delete_segctor_group(nilfs);
|
|
kobject_del(&nilfs->ns_dev_kobj);
|
|
kfree(nilfs->ns_dev_subgroups);
|
|
}
|
|
|
|
/************************************************************************
|
|
* 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);
|
|
}
|