fs/f2fs/sysfs.c - linux - Git at Google

 /*
  * f2fs sysfs interface
  *
  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
  *             http://www.samsung.com/
  * Copyright (c) 2017 Chao Yu <chao@kernel.org>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
 #include <linux/proc_fs.h>
 #include <linux/f2fs_fs.h>

 #include "f2fs.h"
 #include "segment.h"
 #include "gc.h"

 static struct proc_dir_entry *f2fs_proc_root;
 static struct kset *f2fs_kset;

 /* Sysfs support for f2fs */
 enum {
 	GC_THREAD,	/* struct f2fs_gc_thread */
 	SM_INFO,	/* struct f2fs_sm_info */
 	DCC_INFO,	/* struct discard_cmd_control */
 	NM_INFO,	/* struct f2fs_nm_info */
 	F2FS_SBI,	/* struct f2fs_sb_info */
 #ifdef CONFIG_F2FS_FAULT_INJECTION
 	FAULT_INFO_RATE,	/* struct f2fs_fault_info */
 	FAULT_INFO_TYPE,	/* struct f2fs_fault_info */
 #endif
 	RESERVED_BLOCKS,
 };

 struct f2fs_attr {
 	struct attribute attr;
 	ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
 	ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
 			 const char *, size_t);
 	int struct_type;
 	int offset;
 };

 static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
 {
 	if (struct_type == GC_THREAD)
 		return (unsigned char *)sbi->gc_thread;
 	else if (struct_type == SM_INFO)
 		return (unsigned char *)SM_I(sbi);
 	else if (struct_type == DCC_INFO)
 		return (unsigned char *)SM_I(sbi)->dcc_info;
 	else if (struct_type == NM_INFO)
 		return (unsigned char *)NM_I(sbi);
 	else if (struct_type == F2FS_SBI || struct_type == RESERVED_BLOCKS)
 		return (unsigned char *)sbi;
 #ifdef CONFIG_F2FS_FAULT_INJECTION
 	else if (struct_type == FAULT_INFO_RATE ||
 					struct_type == FAULT_INFO_TYPE)
 		return (unsigned char *)&sbi->fault_info;
 #endif
 	return NULL;
 }

 static ssize_t lifetime_write_kbytes_show(struct f2fs_attr *a,
 		struct f2fs_sb_info *sbi, char *buf)
 {
 	struct super_block *sb = sbi->sb;

 	if (!sb->s_bdev->bd_part)
 		return snprintf(buf, PAGE_SIZE, "0\n");

 	return snprintf(buf, PAGE_SIZE, "%llu\n",
 		(unsigned long long)(sbi->kbytes_written +
 			BD_PART_WRITTEN(sbi)));
 }

 static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
 			struct f2fs_sb_info *sbi, char *buf)
 {
 	unsigned char *ptr = NULL;
 	unsigned int *ui;

 	ptr = __struct_ptr(sbi, a->struct_type);
 	if (!ptr)
 		return -EINVAL;

 	ui = (unsigned int *)(ptr + a->offset);

 	return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
 }

 static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
 			struct f2fs_sb_info *sbi,
 			const char *buf, size_t count)
 {
 	unsigned char *ptr;
 	unsigned long t;
 	unsigned int *ui;
 	ssize_t ret;

 	ptr = __struct_ptr(sbi, a->struct_type);
 	if (!ptr)
 		return -EINVAL;

 	ui = (unsigned int *)(ptr + a->offset);

 	ret = kstrtoul(skip_spaces(buf), 0, &t);
 	if (ret < 0)
 		return ret;
 #ifdef CONFIG_F2FS_FAULT_INJECTION
 	if (a->struct_type == FAULT_INFO_TYPE && t >= (1 << FAULT_MAX))
 		return -EINVAL;
 #endif
 	if (a->struct_type == RESERVED_BLOCKS) {
 		spin_lock(&sbi->stat_lock);
 		if ((unsigned long)sbi->total_valid_block_count + t >
 				(unsigned long)sbi->user_block_count) {
 			spin_unlock(&sbi->stat_lock);
 			return -EINVAL;
 		}
 		*ui = t;
 		spin_unlock(&sbi->stat_lock);
 		return count;
 	}
 	*ui = t;
 	return count;
 }

 static ssize_t f2fs_attr_show(struct kobject *kobj,
 				struct attribute *attr, char *buf)
 {
 	struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 								s_kobj);
 	struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);

 	return a->show ? a->show(a, sbi, buf) : 0;
 }

 static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
 						const char *buf, size_t len)
 {
 	struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 									s_kobj);
 	struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);

 	return a->store ? a->store(a, sbi, buf, len) : 0;
 }

 static void f2fs_sb_release(struct kobject *kobj)
 {
 	struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 								s_kobj);
 	complete(&sbi->s_kobj_unregister);
 }

 #define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
 static struct f2fs_attr f2fs_attr_##_name = {			\
 	.attr = {.name = __stringify(_name), .mode = _mode },	\
 	.show	= _show,					\
 	.store	= _store,					\
 	.struct_type = _struct_type,				\
 	.offset = _offset					\
 }

 #define F2FS_RW_ATTR(struct_type, struct_name, name, elname)	\
 	F2FS_ATTR_OFFSET(struct_type, name, 0644,		\
 		f2fs_sbi_show, f2fs_sbi_store,			\
 		offsetof(struct struct_name, elname))

 #define F2FS_GENERAL_RO_ATTR(name) \
 static struct f2fs_attr f2fs_attr_##name = __ATTR(name, 0444, name##_show, NULL)

 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
 F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, max_small_discards, max_discards);
 F2FS_RW_ATTR(RESERVED_BLOCKS, f2fs_sb_info, reserved_blocks, reserved_blocks);
 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, batched_trim_sections, trim_sections);
 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);
 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_hot_blocks, min_hot_blocks);
 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ra_nid_pages, ra_nid_pages);
 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, dirty_nats_ratio, dirty_nats_ratio);
 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, cp_interval, interval_time[CP_TIME]);
 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, idle_interval, interval_time[REQ_TIME]);
 #ifdef CONFIG_F2FS_FAULT_INJECTION
 F2FS_RW_ATTR(FAULT_INFO_RATE, f2fs_fault_info, inject_rate, inject_rate);
 F2FS_RW_ATTR(FAULT_INFO_TYPE, f2fs_fault_info, inject_type, inject_type);
 #endif
 F2FS_GENERAL_RO_ATTR(lifetime_write_kbytes);

 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
 static struct attribute *f2fs_attrs[] = {
 	ATTR_LIST(gc_min_sleep_time),
 	ATTR_LIST(gc_max_sleep_time),
 	ATTR_LIST(gc_no_gc_sleep_time),
 	ATTR_LIST(gc_idle),
 	ATTR_LIST(reclaim_segments),
 	ATTR_LIST(max_small_discards),
 	ATTR_LIST(batched_trim_sections),
 	ATTR_LIST(ipu_policy),
 	ATTR_LIST(min_ipu_util),
 	ATTR_LIST(min_fsync_blocks),
 	ATTR_LIST(min_hot_blocks),
 	ATTR_LIST(max_victim_search),
 	ATTR_LIST(dir_level),
 	ATTR_LIST(ram_thresh),
 	ATTR_LIST(ra_nid_pages),
 	ATTR_LIST(dirty_nats_ratio),
 	ATTR_LIST(cp_interval),
 	ATTR_LIST(idle_interval),
 #ifdef CONFIG_F2FS_FAULT_INJECTION
 	ATTR_LIST(inject_rate),
 	ATTR_LIST(inject_type),
 #endif
 	ATTR_LIST(lifetime_write_kbytes),
 	ATTR_LIST(reserved_blocks),
 	NULL,
 };

 static const struct sysfs_ops f2fs_attr_ops = {
 	.show	= f2fs_attr_show,
 	.store	= f2fs_attr_store,
 };

 static struct kobj_type f2fs_ktype = {
 	.default_attrs	= f2fs_attrs,
 	.sysfs_ops	= &f2fs_attr_ops,
 	.release	= f2fs_sb_release,
 };

 static int segment_info_seq_show(struct seq_file *seq, void *offset)
 {
 	struct super_block *sb = seq->private;
 	struct f2fs_sb_info *sbi = F2FS_SB(sb);
 	unsigned int total_segs =
 			le32_to_cpu(sbi->raw_super->segment_count_main);
 	int i;

 	seq_puts(seq, "format: segment_type|valid_blocks\n"
 		"segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");

 	for (i = 0; i < total_segs; i++) {
 		struct seg_entry *se = get_seg_entry(sbi, i);

 		if ((i % 10) == 0)
 			seq_printf(seq, "%-10d", i);
 		seq_printf(seq, "%d|%-3u", se->type,
 					get_valid_blocks(sbi, i, false));
 		if ((i % 10) == 9 || i == (total_segs - 1))
 			seq_putc(seq, '\n');
 		else
 			seq_putc(seq, ' ');
 	}

 	return 0;
 }

 static int segment_bits_seq_show(struct seq_file *seq, void *offset)
 {
 	struct super_block *sb = seq->private;
 	struct f2fs_sb_info *sbi = F2FS_SB(sb);
 	unsigned int total_segs =
 			le32_to_cpu(sbi->raw_super->segment_count_main);
 	int i, j;

 	seq_puts(seq, "format: segment_type|valid_blocks|bitmaps\n"
 		"segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");

 	for (i = 0; i < total_segs; i++) {
 		struct seg_entry *se = get_seg_entry(sbi, i);

 		seq_printf(seq, "%-10d", i);
 		seq_printf(seq, "%d|%-3u|", se->type,
 					get_valid_blocks(sbi, i, false));
 		for (j = 0; j < SIT_VBLOCK_MAP_SIZE; j++)
 			seq_printf(seq, " %.2x", se->cur_valid_map[j]);
 		seq_putc(seq, '\n');
 	}
 	return 0;
 }

 #define F2FS_PROC_FILE_DEF(_name)					\
 static int _name##_open_fs(struct inode *inode, struct file *file)	\
 {									\
 	return single_open(file, _name##_seq_show, PDE_DATA(inode));	\
 }									\
 									\
 static const struct file_operations f2fs_seq_##_name##_fops = {		\
 	.open = _name##_open_fs,					\
 	.read = seq_read,						\
 	.llseek = seq_lseek,						\
 	.release = single_release,					\
 };

 F2FS_PROC_FILE_DEF(segment_info);
 F2FS_PROC_FILE_DEF(segment_bits);

 int __init f2fs_register_sysfs(void)
 {
 	f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);

 	f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
 	if (!f2fs_kset)
 		return -ENOMEM;
 	return 0;
 }

 void f2fs_unregister_sysfs(void)
 {
 	kset_unregister(f2fs_kset);
 	remove_proc_entry("fs/f2fs", NULL);
 }

 int f2fs_init_sysfs(struct f2fs_sb_info *sbi)
 {
 	struct super_block *sb = sbi->sb;
 	int err;

 	if (f2fs_proc_root)
 		sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);

 	if (sbi->s_proc) {
 		proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
 				 &f2fs_seq_segment_info_fops, sb);
 		proc_create_data("segment_bits", S_IRUGO, sbi->s_proc,
 				 &f2fs_seq_segment_bits_fops, sb);
 	}

 	sbi->s_kobj.kset = f2fs_kset;
 	init_completion(&sbi->s_kobj_unregister);
 	err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
 							"%s", sb->s_id);
 	if (err)
 		goto err_out;
 	return 0;
 err_out:
 	if (sbi->s_proc) {
 		remove_proc_entry("segment_info", sbi->s_proc);
 		remove_proc_entry("segment_bits", sbi->s_proc);
 		remove_proc_entry(sb->s_id, f2fs_proc_root);
 	}
 	return err;
 }

 void f2fs_exit_sysfs(struct f2fs_sb_info *sbi)
 {
 	kobject_del(&sbi->s_kobj);
 	kobject_put(&sbi->s_kobj);
 	wait_for_completion(&sbi->s_kobj_unregister);

 	if (sbi->s_proc) {
 		remove_proc_entry("segment_info", sbi->s_proc);
 		remove_proc_entry("segment_bits", sbi->s_proc);
 		remove_proc_entry(sbi->sb->s_id, f2fs_proc_root);
 	}
 }
	/*
	* f2fs sysfs interface
	*
	* Copyright (c) 2012 Samsung Electronics Co., Ltd.
	* http://www.samsung.com/
	* Copyright (c) 2017 Chao Yu <chao@kernel.org>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/
	#include <linux/proc_fs.h>
	#include <linux/f2fs_fs.h>

	#include "f2fs.h"
	#include "segment.h"
	#include "gc.h"

	static struct proc_dir_entry *f2fs_proc_root;
	static struct kset *f2fs_kset;

	/* Sysfs support for f2fs */
	enum {
	GC_THREAD, /* struct f2fs_gc_thread */
	SM_INFO, /* struct f2fs_sm_info */
	DCC_INFO, /* struct discard_cmd_control */
	NM_INFO, /* struct f2fs_nm_info */
	F2FS_SBI, /* struct f2fs_sb_info */
	#ifdef CONFIG_F2FS_FAULT_INJECTION
	FAULT_INFO_RATE, /* struct f2fs_fault_info */
	FAULT_INFO_TYPE, /* struct f2fs_fault_info */
	#endif
	RESERVED_BLOCKS,
	};

	struct f2fs_attr {
	struct attribute attr;
	ssize_t (show)(struct f2fs_attr , struct f2fs_sb_info , char );
	ssize_t (store)(struct f2fs_attr , struct f2fs_sb_info *,
	const char *, size_t);
	int struct_type;
	int offset;
	};

	static unsigned char __struct_ptr(struct f2fs_sb_info sbi, int struct_type)
	{
	if (struct_type == GC_THREAD)
	return (unsigned char *)sbi->gc_thread;
	else if (struct_type == SM_INFO)
	return (unsigned char *)SM_I(sbi);
	else if (struct_type == DCC_INFO)
	return (unsigned char *)SM_I(sbi)->dcc_info;
	else if (struct_type == NM_INFO)
	return (unsigned char *)NM_I(sbi);
	else if (struct_type == F2FS_SBI \|\| struct_type == RESERVED_BLOCKS)
	return (unsigned char *)sbi;
	#ifdef CONFIG_F2FS_FAULT_INJECTION
	else if (struct_type == FAULT_INFO_RATE \|\|
	struct_type == FAULT_INFO_TYPE)
	return (unsigned char *)&sbi->fault_info;
	#endif
	return NULL;
	}

	static ssize_t lifetime_write_kbytes_show(struct f2fs_attr *a,
	struct f2fs_sb_info sbi, char buf)
	{
	struct super_block *sb = sbi->sb;

	if (!sb->s_bdev->bd_part)
	return snprintf(buf, PAGE_SIZE, "0\n");

	return snprintf(buf, PAGE_SIZE, "%llu\n",
	(unsigned long long)(sbi->kbytes_written +
	BD_PART_WRITTEN(sbi)));
	}

	static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
	struct f2fs_sb_info sbi, char buf)
	{
	unsigned char *ptr = NULL;
	unsigned int *ui;

	ptr = __struct_ptr(sbi, a->struct_type);
	if (!ptr)
	return -EINVAL;

	ui = (unsigned int *)(ptr + a->offset);

	return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
	}

	static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
	struct f2fs_sb_info *sbi,
	const char *buf, size_t count)
	{
	unsigned char *ptr;
	unsigned long t;
	unsigned int *ui;
	ssize_t ret;

	ptr = __struct_ptr(sbi, a->struct_type);
	if (!ptr)
	return -EINVAL;

	ui = (unsigned int *)(ptr + a->offset);

	ret = kstrtoul(skip_spaces(buf), 0, &t);
	if (ret < 0)
	return ret;
	#ifdef CONFIG_F2FS_FAULT_INJECTION
	if (a->struct_type == FAULT_INFO_TYPE && t >= (1 << FAULT_MAX))
	return -EINVAL;
	#endif
	if (a->struct_type == RESERVED_BLOCKS) {
	spin_lock(&sbi->stat_lock);
	if ((unsigned long)sbi->total_valid_block_count + t >
	(unsigned long)sbi->user_block_count) {
	spin_unlock(&sbi->stat_lock);
	return -EINVAL;
	}
	*ui = t;
	spin_unlock(&sbi->stat_lock);
	return count;
	}
	*ui = t;
	return count;
	}

	static ssize_t f2fs_attr_show(struct kobject *kobj,
	struct attribute attr, char buf)
	{
	struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
	s_kobj);
	struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);

	return a->show ? a->show(a, sbi, buf) : 0;
	}

	static ssize_t f2fs_attr_store(struct kobject kobj, struct attribute attr,
	const char *buf, size_t len)
	{
	struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
	s_kobj);
	struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);

	return a->store ? a->store(a, sbi, buf, len) : 0;
	}

	static void f2fs_sb_release(struct kobject *kobj)
	{
	struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
	s_kobj);
	complete(&sbi->s_kobj_unregister);
	}

	#define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
	static struct f2fs_attr f2fs_attr_##_name = { \
	.attr = {.name = __stringify(_name), .mode = _mode }, \
	.show = _show, \
	.store = _store, \
	.struct_type = _struct_type, \
	.offset = _offset \
	}

	#define F2FS_RW_ATTR(struct_type, struct_name, name, elname) \
	F2FS_ATTR_OFFSET(struct_type, name, 0644, \
	f2fs_sbi_show, f2fs_sbi_store, \
	offsetof(struct struct_name, elname))

	#define F2FS_GENERAL_RO_ATTR(name) \
	static struct f2fs_attr f2fs_attr_##name = __ATTR(name, 0444, name##_show, NULL)

	F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
	F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
	F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
	F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
	F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
	F2FS_RW_ATTR(DCC_INFO, discard_cmd_control, max_small_discards, max_discards);
	F2FS_RW_ATTR(RESERVED_BLOCKS, f2fs_sb_info, reserved_blocks, reserved_blocks);
	F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, batched_trim_sections, trim_sections);
	F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
	F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
	F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);
	F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_hot_blocks, min_hot_blocks);
	F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
	F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ra_nid_pages, ra_nid_pages);
	F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, dirty_nats_ratio, dirty_nats_ratio);
	F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
	F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
	F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, cp_interval, interval_time[CP_TIME]);
	F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, idle_interval, interval_time[REQ_TIME]);
	#ifdef CONFIG_F2FS_FAULT_INJECTION
	F2FS_RW_ATTR(FAULT_INFO_RATE, f2fs_fault_info, inject_rate, inject_rate);
	F2FS_RW_ATTR(FAULT_INFO_TYPE, f2fs_fault_info, inject_type, inject_type);
	#endif
	F2FS_GENERAL_RO_ATTR(lifetime_write_kbytes);

	#define ATTR_LIST(name) (&f2fs_attr_##name.attr)
	static struct attribute *f2fs_attrs[] = {
	ATTR_LIST(gc_min_sleep_time),
	ATTR_LIST(gc_max_sleep_time),
	ATTR_LIST(gc_no_gc_sleep_time),
	ATTR_LIST(gc_idle),
	ATTR_LIST(reclaim_segments),
	ATTR_LIST(max_small_discards),
	ATTR_LIST(batched_trim_sections),
	ATTR_LIST(ipu_policy),
	ATTR_LIST(min_ipu_util),
	ATTR_LIST(min_fsync_blocks),
	ATTR_LIST(min_hot_blocks),
	ATTR_LIST(max_victim_search),
	ATTR_LIST(dir_level),
	ATTR_LIST(ram_thresh),
	ATTR_LIST(ra_nid_pages),
	ATTR_LIST(dirty_nats_ratio),
	ATTR_LIST(cp_interval),
	ATTR_LIST(idle_interval),
	#ifdef CONFIG_F2FS_FAULT_INJECTION
	ATTR_LIST(inject_rate),
	ATTR_LIST(inject_type),
	#endif
	ATTR_LIST(lifetime_write_kbytes),
	ATTR_LIST(reserved_blocks),
	NULL,
	};

	static const struct sysfs_ops f2fs_attr_ops = {
	.show = f2fs_attr_show,
	.store = f2fs_attr_store,
	};

	static struct kobj_type f2fs_ktype = {
	.default_attrs = f2fs_attrs,
	.sysfs_ops = &f2fs_attr_ops,
	.release = f2fs_sb_release,
	};

	static int segment_info_seq_show(struct seq_file seq, void offset)
	{
	struct super_block *sb = seq->private;
	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	unsigned int total_segs =
	le32_to_cpu(sbi->raw_super->segment_count_main);
	int i;

	seq_puts(seq, "format: segment_type\|valid_blocks\n"
	"segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");

	for (i = 0; i < total_segs; i++) {
	struct seg_entry *se = get_seg_entry(sbi, i);

	if ((i % 10) == 0)
	seq_printf(seq, "%-10d", i);
	seq_printf(seq, "%d\|%-3u", se->type,
	get_valid_blocks(sbi, i, false));
	if ((i % 10) == 9 \|\| i == (total_segs - 1))
	seq_putc(seq, '\n');
	else
	seq_putc(seq, ' ');
	}

	return 0;
	}

	static int segment_bits_seq_show(struct seq_file seq, void offset)
	{
	struct super_block *sb = seq->private;
	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	unsigned int total_segs =
	le32_to_cpu(sbi->raw_super->segment_count_main);
	int i, j;

	seq_puts(seq, "format: segment_type\|valid_blocks\|bitmaps\n"
	"segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");

	for (i = 0; i < total_segs; i++) {
	struct seg_entry *se = get_seg_entry(sbi, i);

	seq_printf(seq, "%-10d", i);
	seq_printf(seq, "%d\|%-3u\|", se->type,
	get_valid_blocks(sbi, i, false));
	for (j = 0; j < SIT_VBLOCK_MAP_SIZE; j++)
	seq_printf(seq, " %.2x", se->cur_valid_map[j]);
	seq_putc(seq, '\n');
	}
	return 0;
	}

	#define F2FS_PROC_FILE_DEF(_name) \
	static int _name##_open_fs(struct inode inode, struct file file) \
	{ \
	return single_open(file, _name##_seq_show, PDE_DATA(inode)); \
	} \
	\
	static const struct file_operations f2fs_seq_##_name##_fops = { \
	.open = _name##_open_fs, \
	.read = seq_read, \
	.llseek = seq_lseek, \
	.release = single_release, \
	};

	F2FS_PROC_FILE_DEF(segment_info);
	F2FS_PROC_FILE_DEF(segment_bits);

	int __init f2fs_register_sysfs(void)
	{
	f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);

	f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
	if (!f2fs_kset)
	return -ENOMEM;
	return 0;
	}

	void f2fs_unregister_sysfs(void)
	{
	kset_unregister(f2fs_kset);
	remove_proc_entry("fs/f2fs", NULL);
	}

	int f2fs_init_sysfs(struct f2fs_sb_info *sbi)
	{
	struct super_block *sb = sbi->sb;
	int err;

	if (f2fs_proc_root)
	sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);

	if (sbi->s_proc) {
	proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
	&f2fs_seq_segment_info_fops, sb);
	proc_create_data("segment_bits", S_IRUGO, sbi->s_proc,
	&f2fs_seq_segment_bits_fops, sb);
	}

	sbi->s_kobj.kset = f2fs_kset;
	init_completion(&sbi->s_kobj_unregister);
	err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
	"%s", sb->s_id);
	if (err)
	goto err_out;
	return 0;
	err_out:
	if (sbi->s_proc) {
	remove_proc_entry("segment_info", sbi->s_proc);
	remove_proc_entry("segment_bits", sbi->s_proc);
	remove_proc_entry(sb->s_id, f2fs_proc_root);
	}
	return err;
	}

	void f2fs_exit_sysfs(struct f2fs_sb_info *sbi)
	{
	kobject_del(&sbi->s_kobj);
	kobject_put(&sbi->s_kobj);
	wait_for_completion(&sbi->s_kobj_unregister);

	if (sbi->s_proc) {
	remove_proc_entry("segment_info", sbi->s_proc);
	remove_proc_entry("segment_bits", sbi->s_proc);
	remove_proc_entry(sbi->sb->s_id, f2fs_proc_root);
	}
	}