text: // SPDX-License-Identifier: GPL-2.0
  /*
   * f2fs sysfs interface
   *
   * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   *             http://www.samsung.com/
   * Copyright (c) 2017 Chao Yu <chao@kernel.org>
   */
  #include <linux/compiler.h>
  #include <linux/proc_fs.h>
  #include <linux/f2fs_fs.h>
  #include <linux/seq_file.h>
  
  #include "f2fs.h"
  #include "segment.h"
  #include "gc.h"
  
  static struct proc_dir_entry *f2fs_proc_root;
  
  /* 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_sb_info */
  };
  
  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;
  	int id;
  };
  
  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 *)&F2FS_OPTION(sbi).fault_info;
  #endif
  	return NULL;
  }
  
  static ssize_t dirty_segments_show(struct f2fs_attr *a,
  		struct f2fs_sb_info *sbi, char *buf)
  {
  	return snprintf(buf, PAGE_SIZE, "%llu\n",
  		(unsigned long long)(dirty_segments(sbi)));
  }
  
  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 features_show(struct f2fs_attr *a,
  		struct f2fs_sb_info *sbi, char *buf)
  {
  	struct super_block *sb = sbi->sb;
  	int len = 0;
  
  	if (!sb->s_bdev->bd_part)
  		return snprintf(buf, PAGE_SIZE, "0\n");
  
  	if (f2fs_sb_has_encrypt(sb))
  		len += snprintf(buf, PAGE_SIZE - len, "%s",
  						"encryption");
  	if (f2fs_sb_has_blkzoned(sb))
  		len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
  				len ? ", " : "", "blkzoned");
  	if (f2fs_sb_has_extra_attr(sb))
  		len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
  				len ? ", " : "", "extra_attr");
  	if (f2fs_sb_has_project_quota(sb))
  		len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
  				len ? ", " : "", "projquota");
  	if (f2fs_sb_has_inode_chksum(sb))
  		len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
  				len ? ", " : "", "inode_checksum");
  	if (f2fs_sb_has_flexible_inline_xattr(sb))
  		len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
  				len ? ", " : "", "flexible_inline_xattr");
  	if (f2fs_sb_has_quota_ino(sb))
  		len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
  				len ? ", " : "", "quota_ino");
  	if (f2fs_sb_has_inode_crtime(sb))
  		len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
  				len ? ", " : "", "inode_crtime");
  	if (f2fs_sb_has_lost_found(sb))
  		len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
  				len ? ", " : "", "lost_found");
  	if (f2fs_sb_has_sb_chksum(sb))
  		len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
  				len ? ", " : "", "sb_checksum");
  	len += snprintf(buf + len, PAGE_SIZE - len, "\n");
  	return len;
  }
  
  static ssize_t current_reserved_blocks_show(struct f2fs_attr *a,
  					struct f2fs_sb_info *sbi, char *buf)
  {
  	return snprintf(buf, PAGE_SIZE, "%u\n", sbi->current_reserved_blocks);
  }
  
  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;
  
  	if (!strcmp(a->attr.name, "extension_list")) {
  		__u8 (*extlist)[F2FS_EXTENSION_LEN] =
  					sbi->raw_super->extension_list;
  		int cold_count = le32_to_cpu(sbi->raw_super->extension_count);
  		int hot_count = sbi->raw_super->hot_ext_count;
  		int len = 0, i;
  
  		len += snprintf(buf + len, PAGE_SIZE - len,
  						"cold file extension:\n");
  		for (i = 0; i < cold_count; i++)
  			len += snprintf(buf + len, PAGE_SIZE - len, "%s\n",
  								extlist[i]);
  
  		len += snprintf(buf + len, PAGE_SIZE - len,
  						"hot file extension:\n");
  		for (i = cold_count; i < cold_count + hot_count; i++)
  			len += snprintf(buf + len, PAGE_SIZE - len, "%s\n",
  								extlist[i]);
  		return len;
  	}
  
  	ui = (unsigned int *)(ptr + a->offset);
  
  	return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
  }
  
  static ssize_t __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;
  
  	if (!strcmp(a->attr.name, "extension_list")) {
  		const char *name = strim((char *)buf);
  		bool set = true, hot;
  
  		if (!strncmp(name, "[h]", 3))
  			hot = true;
  		else if (!strncmp(name, "[c]", 3))
  			hot = false;
  		else
  			return -EINVAL;
  
  		name += 3;
  
  		if (*name == '!') {
  			name++;
  			set = false;
  		}
  
  		if (strlen(name) >= F2FS_EXTENSION_LEN)
  			return -EINVAL;
  
  		down_write(&sbi->sb_lock);
  
  		ret = f2fs_update_extension_list(sbi, name, hot, set);
  		if (ret)
  			goto out;
  
  		ret = f2fs_commit_super(sbi, false);
  		if (ret)
  			f2fs_update_extension_list(sbi, name, hot, !set);
  out:
  		up_write(&sbi->sb_lock);
  		return ret ? ret : count;
  	}
  
  	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 (t > (unsigned long)(sbi->user_block_count -
  				F2FS_OPTION(sbi).root_reserved_blocks)) {
  			spin_unlock(&sbi->stat_lock);
  			return -EINVAL;
  		}
  		*ui = t;
  		sbi->current_reserved_blocks = min(sbi->reserved_blocks,
  				sbi->user_block_count - valid_user_blocks(sbi));
  		spin_unlock(&sbi->stat_lock);
  		return count;
  	}
  
  	if (!strcmp(a->attr.name, "discard_granularity")) {
  		if (t == 0 || t > MAX_PLIST_NUM)
  			return -EINVAL;
  		if (t == *ui)
  			return count;
  		*ui = t;
  		return count;
  	}
  
  	if (!strcmp(a->attr.name, "trim_sections"))
  		return -EINVAL;
  
  	if (!strcmp(a->attr.name, "gc_urgent")) {
  		if (t >= 1) {
  			sbi->gc_mode = GC_URGENT;
  			if (sbi->gc_thread) {
  				sbi->gc_thread->gc_wake = 1;
  				wake_up_interruptible_all(
  					&sbi->gc_thread->gc_wait_queue_head);
  				wake_up_discard_thread(sbi, true);
  			}
  		} else {
  			sbi->gc_mode = GC_NORMAL;
  		}
  		return count;
  	}
  	if (!strcmp(a->attr.name, "gc_idle")) {
  		if (t == GC_IDLE_CB)
  			sbi->gc_mode = GC_IDLE_CB;
  		else if (t == GC_IDLE_GREEDY)
  			sbi->gc_mode = GC_IDLE_GREEDY;
  		else
  			sbi->gc_mode = GC_NORMAL;
  		return count;
  	}
  
  	*ui = t;
  
  	if (!strcmp(a->attr.name, "iostat_enable") && *ui == 0)
  		f2fs_reset_iostat(sbi);
  	return count;
  }
  
  static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
  			struct f2fs_sb_info *sbi,
  			const char *buf, size_t count)
  {
  	ssize_t ret;
  	bool gc_entry = (!strcmp(a->attr.name, "gc_urgent") ||
  					a->struct_type == GC_THREAD);
  
  	if (gc_entry) {
  		if (!down_read_trylock(&sbi->sb->s_umount))
  			return -EAGAIN;
  	}
  	ret = __sbi_store(a, sbi, buf, count);
  	if (gc_entry)
  		up_read(&sbi->sb->s_umount);
  
  	return ret;
  }
  
  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);
  }
  
  enum feat_id {
  	FEAT_CRYPTO = 0,
  	FEAT_BLKZONED,
  	FEAT_ATOMIC_WRITE,
  	FEAT_EXTRA_ATTR,
  	FEAT_PROJECT_QUOTA,
  	FEAT_INODE_CHECKSUM,
  	FEAT_FLEXIBLE_INLINE_XATTR,
  	FEAT_QUOTA_INO,
  	FEAT_INODE_CRTIME,
  	FEAT_LOST_FOUND,
  	FEAT_SB_CHECKSUM,
  };
  
  static ssize_t f2fs_feature_show(struct f2fs_attr *a,
  		struct f2fs_sb_info *sbi, char *buf)
  {
  	switch (a->id) {
  	case FEAT_CRYPTO:
  	case FEAT_BLKZONED:
  	case FEAT_ATOMIC_WRITE:
  	case FEAT_EXTRA_ATTR:
  	case FEAT_PROJECT_QUOTA:
  	case FEAT_INODE_CHECKSUM:
  	case FEAT_FLEXIBLE_INLINE_XATTR:
  	case FEAT_QUOTA_INO:
  	case FEAT_INODE_CRTIME:
  	case FEAT_LOST_FOUND:
  	case FEAT_SB_CHECKSUM:
  		return snprintf(buf, PAGE_SIZE, "supported\n");
  	}
  	return 0;
  }
  
  #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)
  
  #define F2FS_FEATURE_RO_ATTR(_name, _id)			\
  static struct f2fs_attr f2fs_attr_##_name = {			\
  	.attr = {.name = __stringify(_name), .mode = 0444 },	\
  	.show	= f2fs_feature_show,				\
  	.id	= _id,						\
  }
  
  F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_urgent_sleep_time,
  							urgent_sleep_time);
  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(F2FS_SBI, f2fs_sb_info, gc_idle, gc_mode);
  F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_urgent, gc_mode);
  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(DCC_INFO, discard_cmd_control, discard_granularity, discard_granularity);
  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_seq_blocks, min_seq_blocks);
  F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_hot_blocks, min_hot_blocks);
  F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ssr_sections, min_ssr_sections);
  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]);
  F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, discard_idle_interval,
  					interval_time[DISCARD_TIME]);
  F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_idle_interval, interval_time[GC_TIME]);
  F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, iostat_enable, iostat_enable);
  F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, readdir_ra, readdir_ra);
  F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, gc_pin_file_thresh, gc_pin_file_threshold);
  F2FS_RW_ATTR(F2FS_SBI, f2fs_super_block, extension_list, extension_list);
  #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(dirty_segments);
  F2FS_GENERAL_RO_ATTR(lifetime_write_kbytes);
  F2FS_GENERAL_RO_ATTR(features);
  F2FS_GENERAL_RO_ATTR(current_reserved_blocks);
  
  #ifdef CONFIG_F2FS_FS_ENCRYPTION
  F2FS_FEATURE_RO_ATTR(encryption, FEAT_CRYPTO);
  #endif
  #ifdef CONFIG_BLK_DEV_ZONED
  F2FS_FEATURE_RO_ATTR(block_zoned, FEAT_BLKZONED);
  #endif
  F2FS_FEATURE_RO_ATTR(atomic_write, FEAT_ATOMIC_WRITE);
  F2FS_FEATURE_RO_ATTR(extra_attr, FEAT_EXTRA_ATTR);
  F2FS_FEATURE_RO_ATTR(project_quota, FEAT_PROJECT_QUOTA);
  F2FS_FEATURE_RO_ATTR(inode_checksum, FEAT_INODE_CHECKSUM);
  F2FS_FEATURE_RO_ATTR(flexible_inline_xattr, FEAT_FLEXIBLE_INLINE_XATTR);
  F2FS_FEATURE_RO_ATTR(quota_ino, FEAT_QUOTA_INO);
  F2FS_FEATURE_RO_ATTR(inode_crtime, FEAT_INODE_CRTIME);
  F2FS_FEATURE_RO_ATTR(lost_found, FEAT_LOST_FOUND);
  F2FS_FEATURE_RO_ATTR(sb_checksum, FEAT_SB_CHECKSUM);
  
  #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
  static struct attribute *f2fs_attrs[] = {
  	ATTR_LIST(gc_urgent_sleep_time),
  	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(gc_urgent),
  	ATTR_LIST(reclaim_segments),
  	ATTR_LIST(max_small_discards),
  	ATTR_LIST(discard_granularity),
  	ATTR_LIST(batched_trim_sections),
  	ATTR_LIST(ipu_policy),
  	ATTR_LIST(min_ipu_util),
  	ATTR_LIST(min_fsync_blocks),
  	ATTR_LIST(min_seq_blocks),
  	ATTR_LIST(min_hot_blocks),
  	ATTR_LIST(min_ssr_sections),
  	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),
  	ATTR_LIST(discard_idle_interval),
  	ATTR_LIST(gc_idle_interval),
  	ATTR_LIST(iostat_enable),
  	ATTR_LIST(readdir_ra),
  	ATTR_LIST(gc_pin_file_thresh),
  	ATTR_LIST(extension_list),
  #ifdef CONFIG_F2FS_FAULT_INJECTION
  	ATTR_LIST(inject_rate),
  	ATTR_LIST(inject_type),
  #endif
  	ATTR_LIST(dirty_segments),
  	ATTR_LIST(lifetime_write_kbytes),
  	ATTR_LIST(features),
  	ATTR_LIST(reserved_blocks),
  	ATTR_LIST(current_reserved_blocks),
  	NULL,
  };
  
  static struct attribute *f2fs_feat_attrs[] = {
  #ifdef CONFIG_F2FS_FS_ENCRYPTION
  	ATTR_LIST(encryption),
  #endif
  #ifdef CONFIG_BLK_DEV_ZONED
  	ATTR_LIST(block_zoned),
  #endif
  	ATTR_LIST(atomic_write),
  	ATTR_LIST(extra_attr),
  	ATTR_LIST(project_quota),
  	ATTR_LIST(inode_checksum),
  	ATTR_LIST(flexible_inline_xattr),
  	ATTR_LIST(quota_ino),
  	ATTR_LIST(inode_crtime),
  	ATTR_LIST(lost_found),
  	ATTR_LIST(sb_checksum),
  	NULL,
  };
  
  static const struct sysfs_ops f2fs_attr_ops = {
  	.show	= f2fs_attr_show,
  	.store	= f2fs_attr_store,
  };
  
  static struct kobj_type f2fs_sb_ktype = {
  	.default_attrs	= f2fs_attrs,
  	.sysfs_ops	= &f2fs_attr_ops,
  	.release	= f2fs_sb_release,
  };
  
  static struct kobj_type f2fs_ktype = {
  	.sysfs_ops	= &f2fs_attr_ops,
  };
  
  static struct kset f2fs_kset = {
  	.kobj   = {.ktype = &f2fs_ktype},
  };
  
  static struct kobj_type f2fs_feat_ktype = {
  	.default_attrs	= f2fs_feat_attrs,
  	.sysfs_ops	= &f2fs_attr_ops,
  };
  
  static struct kobject f2fs_feat = {
  	.kset	= &f2fs_kset,
  };
  
  static int __maybe_unused 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 __maybe_unused 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;
  }
  
  static int __maybe_unused iostat_info_seq_show(struct seq_file *seq,
  					       void *offset)
  {
  	struct super_block *sb = seq->private;
  	struct f2fs_sb_info *sbi = F2FS_SB(sb);
  	time64_t now = ktime_get_real_seconds();
  
  	if (!sbi->iostat_enable)
  		return 0;
  
  	seq_printf(seq, "time:		%-16llu\n", now);
  
  	/* print app IOs */
  	seq_printf(seq, "app buffered:	%-16llu\n",
  				sbi->write_iostat[APP_BUFFERED_IO]);
  	seq_printf(seq, "app direct:	%-16llu\n",
  				sbi->write_iostat[APP_DIRECT_IO]);
  	seq_printf(seq, "app mapped:	%-16llu\n",
  				sbi->write_iostat[APP_MAPPED_IO]);
  
  	/* print fs IOs */
  	seq_printf(seq, "fs data:	%-16llu\n",
  				sbi->write_iostat[FS_DATA_IO]);
  	seq_printf(seq, "fs node:	%-16llu\n",
  				sbi->write_iostat[FS_NODE_IO]);
  	seq_printf(seq, "fs meta:	%-16llu\n",
  				sbi->write_iostat[FS_META_IO]);
  	seq_printf(seq, "fs gc data:	%-16llu\n",
  				sbi->write_iostat[FS_GC_DATA_IO]);
  	seq_printf(seq, "fs gc node:	%-16llu\n",
  				sbi->write_iostat[FS_GC_NODE_IO]);
  	seq_printf(seq, "fs cp data:	%-16llu\n",
  				sbi->write_iostat[FS_CP_DATA_IO]);
  	seq_printf(seq, "fs cp node:	%-16llu\n",
  				sbi->write_iostat[FS_CP_NODE_IO]);
  	seq_printf(seq, "fs cp meta:	%-16llu\n",
  				sbi->write_iostat[FS_CP_META_IO]);
  	seq_printf(seq, "fs discard:	%-16llu\n",
  				sbi->write_iostat[FS_DISCARD]);
  
  	return 0;
  }
  
  static int __maybe_unused victim_bits_seq_show(struct seq_file *seq,
  						void *offset)
  {
  	struct super_block *sb = seq->private;
  	struct f2fs_sb_info *sbi = F2FS_SB(sb);
  	struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
  	int i;
  
  	seq_puts(seq, "format: victim_secmap bitmaps\n");
  
  	for (i = 0; i < MAIN_SECS(sbi); i++) {
  		if ((i % 10) == 0)
  			seq_printf(seq, "%-10d", i);
  		seq_printf(seq, "%d", test_bit(i, dirty_i->victim_secmap) ? 1 : 0);
  		if ((i % 10) == 9 || i == (MAIN_SECS(sbi) - 1))
  			seq_putc(seq, '\n');
  		else
  			seq_putc(seq, ' ');
  	}
  	return 0;
  }
  
  int __init f2fs_init_sysfs(void)
  {
  	int ret;
  
  	kobject_set_name(&f2fs_kset.kobj, "f2fs");
  	f2fs_kset.kobj.parent = fs_kobj;
  	ret = kset_register(&f2fs_kset);
  	if (ret)
  		return ret;
  
  	ret = kobject_init_and_add(&f2fs_feat, &f2fs_feat_ktype,
  				   NULL, "features");
  	if (ret)
  		kset_unregister(&f2fs_kset);
  	else
  		f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
  	return ret;
  }
  
  void f2fs_exit_sysfs(void)
  {
  	kobject_put(&f2fs_feat);
  	kset_unregister(&f2fs_kset);
  	remove_proc_entry("fs/f2fs", NULL);
  	f2fs_proc_root = NULL;
  }
  
  int f2fs_register_sysfs(struct f2fs_sb_info *sbi)
  {
  	struct super_block *sb = sbi->sb;
  	int err;
  
  	sbi->s_kobj.kset = &f2fs_kset;
  	init_completion(&sbi->s_kobj_unregister);
  	err = kobject_init_and_add(&sbi->s_kobj, &f2fs_sb_ktype, NULL,
  				"%s", sb->s_id);
  	if (err)
  		return err;
  
  	if (f2fs_proc_root)
  		sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
  
  	if (sbi->s_proc) {
  		proc_create_single_data("segment_info", S_IRUGO, sbi->s_proc,
  				segment_info_seq_show, sb);
  		proc_create_single_data("segment_bits", S_IRUGO, sbi->s_proc,
  				segment_bits_seq_show, sb);
  		proc_create_single_data("iostat_info", S_IRUGO, sbi->s_proc,
  				iostat_info_seq_show, sb);
  		proc_create_single_data("victim_bits", S_IRUGO, sbi->s_proc,
  				victim_bits_seq_show, sb);
  	}
  	return 0;
  }
  
  void f2fs_unregister_sysfs(struct f2fs_sb_info *sbi)
  {
  	if (sbi->s_proc) {
  		remove_proc_entry("iostat_info", sbi->s_proc);
  		remove_proc_entry("segment_info", sbi->s_proc);
  		remove_proc_entry("segment_bits", sbi->s_proc);
  		remove_proc_entry("victim_bits", sbi->s_proc);
  		remove_proc_entry(sbi->sb->s_id, f2fs_proc_root);
  	}
  	kobject_del(&sbi->s_kobj);
  }
  