path: root/fs/f2fs/sysfs.c

// 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 <linux/unicode.h>

#include "f2fs.h"
#include "segment.h"
#include "gc.h"
#include <trace/events/f2fs.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_STAT_FS
	STAT_INFO,	/* struct f2fs_stat_info */
#endif
#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 ssize_t f2fs_sbi_show(struct f2fs_attr *a,
			     struct f2fs_sb_info *sbi, char *buf);

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
#ifdef CONFIG_F2FS_STAT_FS
	else if (struct_type == STAT_INFO)
		return (unsigned char *)F2FS_STAT(sbi);
#endif
	return NULL;
}

static ssize_t dirty_segments_show(struct f2fs_attr *a,
		struct f2fs_sb_info *sbi, char *buf)
{
	return sprintf(buf, "%llu\n",
			(unsigned long long)(dirty_segments(sbi)));
}

static ssize_t free_segments_show(struct f2fs_attr *a,
		struct f2fs_sb_info *sbi, char *buf)
{
	return sprintf(buf, "%llu\n",
			(unsigned long long)(free_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 sprintf(buf, "0\n");

	return sprintf(buf, "%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 sprintf(buf, "0\n");

	if (f2fs_sb_has_encrypt(sbi))
		len += scnprintf(buf, PAGE_SIZE - len, "%s",
						"encryption");
	if (f2fs_sb_has_blkzoned(sbi))
		len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
				len ? ", " : "", "blkzoned");
	if (f2fs_sb_has_extra_attr(sbi))
		len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
				len ? ", " : "", "extra_attr");
	if (f2fs_sb_has_project_quota(sbi))
		len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
				len ? ", " : "", "projquota");
	if (f2fs_sb_has_inode_chksum(sbi))
		len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
				len ? ", " : "", "inode_checksum");
	if (f2fs_sb_has_flexible_inline_xattr(sbi))
		len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
				len ? ", " : "", "flexible_inline_xattr");
	if (f2fs_sb_has_quota_ino(sbi))
		len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
				len ? ", " : "", "quota_ino");
	if (f2fs_sb_has_inode_crtime(sbi))
		len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
				len ? ", " : "", "inode_crtime");
	if (f2fs_sb_has_lost_found(sbi))
		len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
				len ? ", " : "", "lost_found");
	if (f2fs_sb_has_verity(sbi))
		len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
				len ? ", " : "", "verity");
	if (f2fs_sb_has_sb_chksum(sbi))
		len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
				len ? ", " : "", "sb_checksum");
	if (f2fs_sb_has_casefold(sbi))
		len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",