[linux-2.6-block.git] / fs / ext4 / sysfs.c

// SPDX-License-Identifier: GPL-2.0
/*
 *  linux/fs/ext4/sysfs.c
 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Theodore Ts'o (tytso@mit.edu)
 *
 */

#include <linux/time.h>
#include <linux/fs.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/proc_fs.h>
#include <linux/part_stat.h>

#include "ext4.h"
#include "ext4_jbd2.h"

typedef enum {
	attr_noop,
	attr_delayed_allocation_blocks,
	attr_session_write_kbytes,
	attr_lifetime_write_kbytes,
	attr_reserved_clusters,
	attr_inode_readahead,
	attr_trigger_test_error,
	attr_first_error_time,
	attr_last_error_time,
	attr_feature,
	attr_pointer_ui,
	attr_pointer_ul,
	attr_pointer_u64,
	attr_pointer_u8,
	attr_pointer_string,
	attr_pointer_atomic,
	attr_journal_task,
} attr_id_t;

typedef enum {
	ptr_explicit,
	ptr_ext4_sb_info_offset,
	ptr_ext4_super_block_offset,
} attr_ptr_t;

static const char proc_dirname[] = "fs/ext4";
static struct proc_dir_entry *ext4_proc_root;

struct ext4_attr {
	struct attribute attr;
	short attr_id;
	short attr_ptr;
	unsigned short attr_size;
	union {
		int offset;
		void *explicit_ptr;
	} u;
};

static ssize_t session_write_kbytes_show(struct ext4_sb_info *sbi, char *buf)
{
	struct super_block *sb = sbi->s_buddy_cache->i_sb;

	if (!sb->s_bdev->bd_part)
		return snprintf(buf, PAGE_SIZE, "0\n");
	return snprintf(buf, PAGE_SIZE, "%lu\n",
			(part_stat_read(sb->s_bdev->bd_part,
					sectors[STAT_WRITE]) -
			 sbi->s_sectors_written_start) >> 1);
}

static ssize_t lifetime_write_kbytes_show(struct ext4_sb_info *sbi, char *buf)
{
	struct super_block *sb = sbi->s_buddy_cache->i_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->s_kbytes_written +
			((part_stat_read(sb->s_bdev->bd_part,
					 sectors[STAT_WRITE]) -
			  EXT4_SB(sb)->s_sectors_written_start) >> 1)));
}

static ssize_t inode_readahead_blks_store(struct ext4_sb_info *sbi,
					  const char *buf, size_t count)
{
	unsigned long t;
	int ret;

	ret = kstrtoul(skip_spaces(buf), 0, &t);
	if (ret)
		return ret;

	if (t && (!is_power_of_2(t) || t > 0x40000000))
		return -EINVAL;

	sbi->s_inode_readahead_blks = t;
	return count;
}

static ssize_t reserved_clusters_store(struct ext4_sb_info *sbi,
				   const char *buf, size_t count)
{
	unsigned long long val;
	ext4_fsblk_t clusters = (ext4_blocks_count(sbi->s_es) >>
				 sbi->s_cluster_bits);
	int ret;

	ret = kstrtoull(skip_spaces(buf), 0, &val);
	if (ret || val >= clusters)
		return -EINVAL;

	atomic64_set(&sbi->s_resv_clusters, val);
	return count;
}

static ssize_t trigger_test_error(struct ext4_sb_info *sbi,
				  const char *buf, size_t count)
{
	int len = count;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	if (len && buf[len-1] == '\n')
		len--;

	if (len)
		ext4_error(sbi->s_sb, "%.*s", len, buf);
	return count;
}

static ssize_t journal_task_show(struct ext4_sb_info *sbi, char *buf)
{
	if (!sbi->s_journal)
		return snprintf(buf, PAGE_SIZE, "<none>\n");
	return snprintf(buf, PAGE_SIZE, "%d\n",
			task_pid_vnr(sbi->s_journal->j_task));
}

#define EXT4_ATTR(_name,_mode,_id)					\
static struct ext4_attr ext4_attr_##_name = {				\
	.attr = {.name = __stringify(_name), .mode = _mode },		\
	.attr_id = attr_##_id,						\
}

#define EXT4_ATTR_FUNC(_name,_mode)  EXT4_ATTR(_name,_mode,_name)

#define EXT4_ATTR_FEATURE(_name)   EXT4_ATTR(_name, 0444, feature)

#define EXT4_ATTR_OFFSET(_name,_mode,_id,_struct,_elname)	\
static struct ext4_attr ext4_attr_##_name = {			\
	.attr = {.name = __stringify(_name), .mode = _mode },	\
	.attr_id = attr_##_id,					\
	.attr_ptr = ptr_##_struct##_offset,			\
	.u = {							\
		.offset = offsetof(struct _struct, _elname),\
	},							\
}

#define EXT4_ATTR_STRING(_name,_mode,_size,_struct,_elname)	\
static struct ext4_attr ext4_attr_##_name = {			\
	.attr = {.name = __stringify(_name), .mode = _mode },	\
	.attr_id = attr_pointer_string,				\
	.attr_size = _size,					\
	.attr_ptr = ptr_##_struct##_offset,			\
	.u = {							\
		.offset = offsetof(struct _struct, _elname),\
	},							\
}

#define EXT4_RO_ATTR_ES_UI(_name,_elname)				\
	EXT4_ATTR_OFFSET(_name, 0444, pointer_ui, ext4_super_block, _elname)

#define EXT4_RO_ATTR_ES_U8(_name,_elname)				\
	EXT4_ATTR_OFFSET(_name, 0444, pointer_u8, ext4_super_block, _elname)

#define EXT4_RO_ATTR_ES_U64(_name,_elname)				\
	EXT4_ATTR_OFFSET(_name, 0444, pointer_u64, ext4_super_block, _elname)

#define EXT4_RO_ATTR_ES_STRING(_name,_elname,_size)			\
	EXT4_ATTR_STRING(_name, 0444, _size, ext4_super_block, _elname)

#define EXT4_RW_ATTR_SBI_UI(_name,_elname)	\
	EXT4_ATTR_OFFSET(_name, 0644, pointer_ui, ext4_sb_info, _elname)

#define EXT4_RW_ATTR_SBI_UL(_name,_elname)	\
	EXT4_ATTR_OFFSET(_name, 0644, pointer_ul, ext4_sb_info, _elname)

#define EXT4_ATTR_PTR(_name,_mode,_id,_ptr) \
static struct ext4_attr ext4_attr_##_name = {			\
	.attr = {.name = __stringify(_name), .mode = _mode },	\
	.attr_id = attr_##_id,					\
	.attr_ptr = ptr_explicit,				\
	.u = {							\
		.explicit_ptr = _ptr,				\
	},							\
}

#define ATTR_LIST(name) &ext4_attr_##name.attr

EXT4_ATTR_FUNC(delayed_allocation_blocks, 0444);
EXT4_ATTR_FUNC(session_write_kbytes, 0444);
EXT4_ATTR_FUNC(lifetime_write_kbytes, 0444);
EXT4_ATTR_FUNC(reserved_clusters, 0644);

EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, inode_readahead,
		 ext4_sb_info, s_inode_readahead_blks);
EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
EXT4_ATTR(trigger_fs_error, 0200, trigger_test_error);
EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
#ifdef CONFIG_EXT4_DEBUG
EXT4_RW_ATTR_SBI_UL(simulate_fail, s_simulate_fail);
#endif
EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
EXT4_RO_ATTR_ES_U8(first_error_errcode, s_first_error_errcode);
EXT4_RO_ATTR_ES_U8(last_error_errcode, s_last_error_errcode);
EXT4_RO_ATTR_ES_UI(first_error_ino, s_first_error_ino);
EXT4_RO_ATTR_ES_UI(last_error_ino, s_last_error_ino);
EXT4_RO_ATTR_ES_U64(first_error_block, s_first_error_block);
EXT4_RO_ATTR_ES_U64(last_error_block, s_last_error_block);
EXT4_RO_ATTR_ES_UI(first_error_line, s_first_error_line);
EXT4_RO_ATTR_ES_UI(last_error_line, s_last_error_line);
EXT4_RO_ATTR_ES_STRING(first_error_func, s_first_error_func, 32);
EXT4_RO_ATTR_ES_STRING(last_error_func, s_last_error_func, 32);
EXT4_ATTR(first_error_time, 0444, first_error_time);
EXT4_ATTR(last_error_time, 0444, last_error_time);
EXT4_ATTR(journal_task, 0444, journal_task);

static unsigned int old_bump_val = 128;
EXT4_ATTR_PTR(max_writeback_mb_bump, 0444, pointer_ui, &old_bump_val);

static struct attribute *ext4_attrs[] = {
	ATTR_LIST(delayed_allocation_blocks),
	ATTR_LIST(session_write_kbytes),
	ATTR_LIST(lifetime_write_kbytes),
	ATTR_LIST(reserved_clusters),
	ATTR_LIST(inode_readahead_blks),
	ATTR_LIST(inode_goal),
	ATTR_LIST(mb_stats),
	ATTR_LIST(mb_max_to_scan),
	ATTR_LIST(mb_min_to_scan),
	ATTR_LIST(mb_order2_req),
	ATTR_LIST(mb_stream_req),
	ATTR_LIST(mb_group_prealloc),
	ATTR_LIST(max_writeback_mb_bump),
	ATTR_LIST(extent_max_zeroout_kb),
	ATTR_LIST(trigger_fs_error),
	ATTR_LIST(err_ratelimit_interval_ms),
	ATTR_LIST(err_ratelimit_burst),
	ATTR_LIST(warning_ratelimit_interval_ms),
	ATTR_LIST(warning_ratelimit_burst),
	ATTR_LIST(msg_ratelimit_interval_ms),
	ATTR_LIST(msg_ratelimit_burst),
	ATTR_LIST(errors_count),
	ATTR_LIST(first_error_ino),
	ATTR_LIST(last_error_ino),
	ATTR_LIST(first_error_block),
	ATTR_LIST(last_error_block),
	ATTR_LIST(first_error_line),
	ATTR_LIST(last_error_line),
	ATTR_LIST(first_error_func),
	ATTR_LIST(last_error_func),
	ATTR_LIST(first_error_errcode),
	ATTR_LIST(last_error_errcode),
	ATTR_LIST(first_error_time),
	ATTR_LIST(last_error_time),
	ATTR_LIST(journal_task),
#ifdef CONFIG_EXT4_DEBUG
	ATTR_LIST(simulate_fail),
#endif
	NULL,
};
ATTRIBUTE_GROUPS(ext4);

/* Features this copy of ext4 supports */
EXT4_ATTR_FEATURE(lazy_itable_init);
EXT4_ATTR_FEATURE(batched_discard);
EXT4_ATTR_FEATURE(meta_bg_resize);
#ifdef CONFIG_FS_ENCRYPTION
EXT4_ATTR_FEATURE(encryption);
EXT4_ATTR_FEATURE(test_dummy_encryption_v2);
#endif
#ifdef CONFIG_UNICODE
EXT4_ATTR_FEATURE(casefold);
#endif
#ifdef CONFIG_FS_VERITY
EXT4_ATTR_FEATURE(verity);
#endif
EXT4_ATTR_FEATURE(metadata_csum_seed);

static struct attribute *ext4_feat_attrs[] = {
	ATTR_LIST(lazy_itable_init),
	ATTR_LIST(batched_discard),
	ATTR_LIST(meta_bg_resize),
#ifdef CONFIG_FS_ENCRYPTION
	ATTR_LIST(encryption),
	ATTR_LIST(test_dummy_encryption_v2),
#endif
#ifdef CONFIG_UNICODE
	ATTR_LIST(casefold),
#endif
#ifdef CONFIG_FS_VERITY
	ATTR_LIST(verity),
#endif
	ATTR_LIST(metadata_csum_seed),
	NULL,
};
ATTRIBUTE_GROUPS(ext4_feat);

static void *calc_ptr(struct ext4_attr *a, struct ext4_sb_info *sbi)
{
	switch (a->attr_ptr) {
	case ptr_explicit:
		return a->u.explicit_ptr;
	case ptr_ext4_sb_info_offset:
		return (void *) (((char *) sbi) + a->u.offset);
	case ptr_ext4_super_block_offset:
		return (void *) (((char *) sbi->s_es) + a->u.offset);
	}
	return NULL;
}

static ssize_t __print_tstamp(char *buf, __le32 lo, __u8 hi)
{
	return snprintf(buf, PAGE_SIZE, "%lld\n",
			((time64_t)hi << 32) + le32_to_cpu(lo));
}

#define print_tstamp(buf, es, tstamp) \
	__print_tstamp(buf, (es)->tstamp, (es)->tstamp ## _hi)

static ssize_t ext4_attr_show(struct kobject *kobj,
			      struct attribute *attr, char *buf)
{
	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
						s_kobj);
	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
	void *ptr = calc_ptr(a, sbi);

	switch (a->attr_id) {
	case attr_delayed_allocation_blocks:
		return snprintf(buf, PAGE_SIZE, "%llu\n",
				(s64) EXT4_C2B(sbi,
		       percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
	case attr_session_write_kbytes:
		return session_write_kbytes_show(sbi, buf);
	case attr_lifetime_write_kbytes:
		return lifetime_write_kbytes_show(sbi, buf);
	case attr_reserved_clusters:
		return snprintf(buf, PAGE_SIZE, "%llu\n",
				(unsigned long long)
				atomic64_read(&sbi->s_resv_clusters));
	case attr_inode_readahead:
	case attr_pointer_ui:
		if (!ptr)
			return 0;
		if (a->attr_ptr == ptr_ext4_super_block_offset)
			return snprintf(buf, PAGE_SIZE, "%u\n",
					le32_to_cpup(ptr));
		else
			return snprintf(buf, PAGE_SIZE, "%u\n",
					*((unsigned int *) ptr));
	case attr_pointer_ul:
		if (!ptr)
			return 0;
		return snprintf(buf, PAGE_SIZE, "%lu\n",
				*((unsigned long *) ptr));
	case attr_pointer_u8:
		if (!ptr)
			return 0;
		return snprintf(buf, PAGE_SIZE, "%u\n",
				*((unsigned char *) ptr));
	case attr_pointer_u64:
		if (!ptr)
			return 0;
		if (a->attr_ptr == ptr_ext4_super_block_offset)
			return snprintf(buf, PAGE_SIZE, "%llu\n",
					le64_to_cpup(ptr));
		else
			return snprintf(buf, PAGE_SIZE, "%llu\n",
					*((unsigned long long *) ptr));
	case attr_pointer_string:
		if (!ptr)
			return 0;
		return snprintf(buf, PAGE_SIZE, "%.*s\n", a->attr_size,
				(char *) ptr);
	case attr_pointer_atomic:
		if (!ptr)
			return 0;
		return snprintf(buf, PAGE_SIZE, "%d\n",
				atomic_read((atomic_t *) ptr));
	case attr_feature:
		return snprintf(buf, PAGE_SIZE, "supported\n");
	case attr_first_error_time:
		return print_tstamp(buf, sbi->s_es, s_first_error_time);
	case attr_last_error_time:
		return print_tstamp(buf, sbi->s_es, s_last_error_time);
	case attr_journal_task:
		return journal_task_show(sbi, buf);
	}

	return 0;
}

static ssize_t ext4_attr_store(struct kobject *kobj,
			       struct attribute *attr,
			       const char *buf, size_t len)
{
	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
						s_kobj);
	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
	void *ptr = calc_ptr(a, sbi);
	unsigned long t;
	int ret;

	switch (a->attr_id) {
	case attr_reserved_clusters:
		return reserved_clusters_store(sbi, buf, len);
	case attr_pointer_ui:
		if (!ptr)
			return 0;
		ret = kstrtoul(skip_spaces(buf), 0, &t);
		if (ret)
			return ret;
		if (a->attr_ptr == ptr_ext4_super_block_offset)
			*((__le32 *) ptr) = cpu_to_le32(t);
		else
			*((unsigned int *) ptr) = t;
		return len;
	case attr_pointer_ul:
		if (!ptr)
			return 0;
		ret = kstrtoul(skip_spaces(buf), 0, &t);
		if (ret)
			return ret;
		*((unsigned long *) ptr) = t;
		return len;
	case attr_inode_readahead:
		return inode_readahead_blks_store(sbi, buf, len);
	case attr_trigger_test_error:
		return trigger_test_error(sbi, buf, len);
	}
	return 0;
}

static void ext4_sb_release(struct kobject *kobj)
{
	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
						s_kobj);
	complete(&sbi->s_kobj_unregister);
}

static const struct sysfs_ops ext4_attr_ops = {
	.show	= ext4_attr_show,
	.store	= ext4_attr_store,
};

static struct kobj_type ext4_sb_ktype = {
	.default_groups = ext4_groups,
	.sysfs_ops	= &ext4_attr_ops,
	.release	= ext4_sb_release,
};

static struct kobj_type ext4_feat_ktype = {
	.default_groups = ext4_feat_groups,
	.sysfs_ops	= &ext4_attr_ops,
	.release	= (void (*)(struct kobject *))kfree,
};

static struct kobject *ext4_root;

static struct kobject *ext4_feat;

int ext4_register_sysfs(struct super_block *sb)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	int err;

	init_completion(&sbi->s_kobj_unregister);
	err = kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, ext4_root,
				   "%s", sb->s_id);
	if (err) {
		kobject_put(&sbi->s_kobj);
		wait_for_completion(&sbi->s_kobj_unregister);
		return err;
	}

	if (ext4_proc_root)
		sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
	if (sbi->s_proc) {
		proc_create_single_data("options", S_IRUGO, sbi->s_proc,
				ext4_seq_options_show, sb);
		proc_create_single_data("es_shrinker_info", S_IRUGO,
				sbi->s_proc, ext4_seq_es_shrinker_info_show,
				sb);
		proc_create_seq_data("mb_groups", S_IRUGO, sbi->s_proc,
				&ext4_mb_seq_groups_ops, sb);
	}
	return 0;
}

void ext4_unregister_sysfs(struct super_block *sb)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);

	if (sbi->s_proc)
		remove_proc_subtree(sb->s_id, ext4_proc_root);
	kobject_del(&sbi->s_kobj);
}

int __init ext4_init_sysfs(void)
{
	int ret;

	ext4_root = kobject_create_and_add("ext4", fs_kobj);
	if (!ext4_root)
		return -ENOMEM;

	ext4_feat = kzalloc(sizeof(*ext4_feat), GFP_KERNEL);
	if (!ext4_feat) {
		ret = -ENOMEM;
		goto root_err;
	}

	ret = kobject_init_and_add(ext4_feat, &ext4_feat_ktype,
				   ext4_root, "features");
	if (ret)
		goto feat_err;

	ext4_proc_root = proc_mkdir(proc_dirname, NULL);
	return ret;

feat_err:
	kobject_put(ext4_feat);
	ext4_feat = NULL;
root_err:
	kobject_put(ext4_root);
	ext4_root = NULL;
	return ret;
}

void ext4_exit_sysfs(void)
{
	kobject_put(ext4_feat);
	ext4_feat = NULL;
	kobject_put(ext4_root);
	ext4_root = NULL;
	remove_proc_entry(proc_dirname, NULL);
	ext4_proc_root = NULL;
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
b5799018 TT	2	/*
	3	* linux/fs/ext4/sysfs.c
	4	*
	5	* Copyright (C) 1992, 1993, 1994, 1995
	6	* Remy Card (card@masi.ibp.fr)
	7	* Theodore Ts'o (tytso@mit.edu)
	8	*
	9	*/
	10
	11	#include <linux/time.h>
	12	#include <linux/fs.h>
	13	#include <linux/seq_file.h>
b99fee58	14	#include <linux/slab.h>
b5799018	15	#include <linux/proc_fs.h>
c6a564ff	16	#include <linux/part_stat.h>
b5799018 TT	17
	18	#include "ext4.h"
	19	#include "ext4_jbd2.h"
	20
76d33bca TT	21	typedef enum {
	22	attr_noop,
	23	attr_delayed_allocation_blocks,
	24	attr_session_write_kbytes,
	25	attr_lifetime_write_kbytes,
	26	attr_reserved_clusters,
	27	attr_inode_readahead,
	28	attr_trigger_test_error,
6a0678a7 AB	29	attr_first_error_time,
6a0678a7 AB	30	attr_last_error_time,
76d33bca TT	31	attr_feature,
76d33bca TT	32	attr_pointer_ui,
46f870d6	33	attr_pointer_ul,
4549b49f TT	34	attr_pointer_u64,
	35	attr_pointer_u8,
	36	attr_pointer_string,
76d33bca	37	attr_pointer_atomic,
bc1d69d6	38	attr_journal_task,
76d33bca TT	39	} attr_id_t;
	40
	41	typedef enum {
	42	ptr_explicit,
	43	ptr_ext4_sb_info_offset,
	44	ptr_ext4_super_block_offset,
	45	} attr_ptr_t;
	46
d6006186	47	static const char proc_dirname[] = "fs/ext4";
ebd173be TT	48	static struct proc_dir_entry *ext4_proc_root;
ebd173be TT	49
b5799018 TT	50	struct ext4_attr {
b5799018 TT	51	struct attribute attr;
76d33bca TT	52	short attr_id;
76d33bca TT	53	short attr_ptr;
4549b49f	54	unsigned short attr_size;
b5799018 TT	55	union {
b5799018 TT	56	int offset;
76d33bca	57	void *explicit_ptr;
b5799018 TT	58	} u;
	59	};
	60
6ca06829	61	static ssize_t session_write_kbytes_show(struct ext4_sb_info sbi, char buf)
b5799018 TT	62	{
	63	struct super_block *sb = sbi->s_buddy_cache->i_sb;
	64
	65	if (!sb->s_bdev->bd_part)
	66	return snprintf(buf, PAGE_SIZE, "0\n");
	67	return snprintf(buf, PAGE_SIZE, "%lu\n",
dbae2c55 MC	68	(part_stat_read(sb->s_bdev->bd_part,
dbae2c55 MC	69	sectors[STAT_WRITE]) -
b5799018 TT	70	sbi->s_sectors_written_start) >> 1);
	71	}
	72
6ca06829	73	static ssize_t lifetime_write_kbytes_show(struct ext4_sb_info sbi, char buf)
b5799018 TT	74	{
	75	struct super_block *sb = sbi->s_buddy_cache->i_sb;
	76
	77	if (!sb->s_bdev->bd_part)
	78	return snprintf(buf, PAGE_SIZE, "0\n");
	79	return snprintf(buf, PAGE_SIZE, "%llu\n",
	80	(unsigned long long)(sbi->s_kbytes_written +
dbae2c55 MC	81	((part_stat_read(sb->s_bdev->bd_part,
dbae2c55 MC	82	sectors[STAT_WRITE]) -
b5799018 TT	83	EXT4_SB(sb)->s_sectors_written_start) >> 1)));
	84	}
	85
6ca06829	86	static ssize_t inode_readahead_blks_store(struct ext4_sb_info *sbi,
b5799018 TT	87	const char *buf, size_t count)
	88	{
	89	unsigned long t;
	90	int ret;
	91
	92	ret = kstrtoul(skip_spaces(buf), 0, &t);
	93	if (ret)
	94	return ret;
	95
	96	if (t && (!is_power_of_2(t) \|\| t > 0x40000000))
	97	return -EINVAL;
	98
	99	sbi->s_inode_readahead_blks = t;
	100	return count;
	101	}
	102
6ca06829	103	static ssize_t reserved_clusters_store(struct ext4_sb_info *sbi,
b5799018 TT	104	const char *buf, size_t count)
	105	{
	106	unsigned long long val;
	107	ext4_fsblk_t clusters = (ext4_blocks_count(sbi->s_es) >>
	108	sbi->s_cluster_bits);
76d33bca	109	int ret;
b5799018	110
76d33bca	111	ret = kstrtoull(skip_spaces(buf), 0, &val);
1ea1516f	112	if (ret \|\| val >= clusters)
b5799018 TT	113	return -EINVAL;
	114
	115	atomic64_set(&sbi->s_resv_clusters, val);
	116	return count;
	117	}
	118
6ca06829	119	static ssize_t trigger_test_error(struct ext4_sb_info *sbi,
b5799018 TT	120	const char *buf, size_t count)
	121	{
	122	int len = count;
	123
	124	if (!capable(CAP_SYS_ADMIN))
	125	return -EPERM;
	126
	127	if (len && buf[len-1] == '\n')
	128	len--;
	129
	130	if (len)
	131	ext4_error(sbi->s_sb, "%.*s", len, buf);
	132	return count;
	133	}
	134
bc1d69d6 KK	135	static ssize_t journal_task_show(struct ext4_sb_info sbi, char buf)
	136	{
	137	if (!sbi->s_journal)
	138	return snprintf(buf, PAGE_SIZE, "<none>\n");
	139	return snprintf(buf, PAGE_SIZE, "%d\n",
	140	task_pid_vnr(sbi->s_journal->j_task));
	141	}
	142
76d33bca TT	143	#define EXT4_ATTR(_name,_mode,_id) \
	144	static struct ext4_attr ext4_attr_##_name = { \
	145	.attr = {.name = __stringify(_name), .mode = _mode }, \
	146	.attr_id = attr_##_id, \
b5799018 TT	147	}
b5799018 TT	148
76d33bca TT	149	#define EXT4_ATTR_FUNC(_name,_mode) EXT4_ATTR(_name,_mode,_name)
	150
	151	#define EXT4_ATTR_FEATURE(_name) EXT4_ATTR(_name, 0444, feature)
	152
	153	#define EXT4_ATTR_OFFSET(_name,_mode,_id,_struct,_elname) \
b5799018 TT	154	static struct ext4_attr ext4_attr_##_name = { \
b5799018 TT	155	.attr = {.name = __stringify(_name), .mode = _mode }, \
76d33bca TT	156	.attr_id = attr_##_id, \
76d33bca TT	157	.attr_ptr = ptr_##_struct##_offset, \
b5799018	158	.u = { \
76d33bca	159	.offset = offsetof(struct _struct, _elname),\
b5799018 TT	160	}, \
	161	}
	162
4549b49f TT	163	#define EXT4_ATTR_STRING(_name,_mode,_size,_struct,_elname) \
	164	static struct ext4_attr ext4_attr_##_name = { \
	165	.attr = {.name = __stringify(_name), .mode = _mode }, \
	166	.attr_id = attr_pointer_string, \
	167	.attr_size = _size, \
	168	.attr_ptr = ptr_##_struct##_offset, \
	169	.u = { \
	170	.offset = offsetof(struct _struct, _elname),\
	171	}, \
	172	}
	173
76d33bca TT	174	#define EXT4_RO_ATTR_ES_UI(_name,_elname) \
76d33bca TT	175	EXT4_ATTR_OFFSET(_name, 0444, pointer_ui, ext4_super_block, _elname)
b5799018	176
4549b49f TT	177	#define EXT4_RO_ATTR_ES_U8(_name,_elname) \
	178	EXT4_ATTR_OFFSET(_name, 0444, pointer_u8, ext4_super_block, _elname)
	179
	180	#define EXT4_RO_ATTR_ES_U64(_name,_elname) \
	181	EXT4_ATTR_OFFSET(_name, 0444, pointer_u64, ext4_super_block, _elname)
	182
	183	#define EXT4_RO_ATTR_ES_STRING(_name,_elname,_size) \
	184	EXT4_ATTR_STRING(_name, 0444, _size, ext4_super_block, _elname)
	185
76d33bca TT	186	#define EXT4_RW_ATTR_SBI_UI(_name,_elname) \
76d33bca TT	187	EXT4_ATTR_OFFSET(_name, 0644, pointer_ui, ext4_sb_info, _elname)
b5799018	188
46f870d6 TT	189	#define EXT4_RW_ATTR_SBI_UL(_name,_elname) \
	190	EXT4_ATTR_OFFSET(_name, 0644, pointer_ul, ext4_sb_info, _elname)
	191
76d33bca	192	#define EXT4_ATTR_PTR(_name,_mode,_id,_ptr) \
b5799018	193	static struct ext4_attr ext4_attr_##_name = { \
76d33bca TT	194	.attr = {.name = __stringify(_name), .mode = _mode }, \
	195	.attr_id = attr_##_id, \
	196	.attr_ptr = ptr_explicit, \
b5799018	197	.u = { \
76d33bca	198	.explicit_ptr = _ptr, \
b5799018 TT	199	}, \
	200	}
	201
76d33bca TT	202	#define ATTR_LIST(name) &ext4_attr_##name.attr
	203
	204	EXT4_ATTR_FUNC(delayed_allocation_blocks, 0444);
	205	EXT4_ATTR_FUNC(session_write_kbytes, 0444);
	206	EXT4_ATTR_FUNC(lifetime_write_kbytes, 0444);
	207	EXT4_ATTR_FUNC(reserved_clusters, 0644);
	208
	209	EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, inode_readahead,
	210	ext4_sb_info, s_inode_readahead_blks);
b5799018 TT	211	EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
	212	EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
	213	EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
	214	EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
	215	EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
	216	EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
	217	EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
b5799018	218	EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
76d33bca	219	EXT4_ATTR(trigger_fs_error, 0200, trigger_test_error);
b5799018 TT	220	EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
	221	EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
	222	EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
	223	EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
	224	EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
	225	EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
46f870d6 TT	226	#ifdef CONFIG_EXT4_DEBUG
	227	EXT4_RW_ATTR_SBI_UL(simulate_fail, s_simulate_fail);
	228	#endif
b5799018	229	EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
4549b49f TT	230	EXT4_RO_ATTR_ES_U8(first_error_errcode, s_first_error_errcode);
	231	EXT4_RO_ATTR_ES_U8(last_error_errcode, s_last_error_errcode);
	232	EXT4_RO_ATTR_ES_UI(first_error_ino, s_first_error_ino);
	233	EXT4_RO_ATTR_ES_UI(last_error_ino, s_last_error_ino);
	234	EXT4_RO_ATTR_ES_U64(first_error_block, s_first_error_block);
	235	EXT4_RO_ATTR_ES_U64(last_error_block, s_last_error_block);
	236	EXT4_RO_ATTR_ES_UI(first_error_line, s_first_error_line);
	237	EXT4_RO_ATTR_ES_UI(last_error_line, s_last_error_line);
	238	EXT4_RO_ATTR_ES_STRING(first_error_func, s_first_error_func, 32);
	239	EXT4_RO_ATTR_ES_STRING(last_error_func, s_last_error_func, 32);
6a0678a7 AB	240	EXT4_ATTR(first_error_time, 0444, first_error_time);
6a0678a7 AB	241	EXT4_ATTR(last_error_time, 0444, last_error_time);
bc1d69d6	242	EXT4_ATTR(journal_task, 0444, journal_task);
b5799018	243
76d33bca TT	244	static unsigned int old_bump_val = 128;
	245	EXT4_ATTR_PTR(max_writeback_mb_bump, 0444, pointer_ui, &old_bump_val);
	246
b5799018 TT	247	static struct attribute *ext4_attrs[] = {
	248	ATTR_LIST(delayed_allocation_blocks),
	249	ATTR_LIST(session_write_kbytes),
	250	ATTR_LIST(lifetime_write_kbytes),
	251	ATTR_LIST(reserved_clusters),
	252	ATTR_LIST(inode_readahead_blks),
	253	ATTR_LIST(inode_goal),
	254	ATTR_LIST(mb_stats),
	255	ATTR_LIST(mb_max_to_scan),
	256	ATTR_LIST(mb_min_to_scan),
	257	ATTR_LIST(mb_order2_req),
	258	ATTR_LIST(mb_stream_req),
	259	ATTR_LIST(mb_group_prealloc),
	260	ATTR_LIST(max_writeback_mb_bump),
	261	ATTR_LIST(extent_max_zeroout_kb),
	262	ATTR_LIST(trigger_fs_error),
	263	ATTR_LIST(err_ratelimit_interval_ms),
	264	ATTR_LIST(err_ratelimit_burst),
	265	ATTR_LIST(warning_ratelimit_interval_ms),
	266	ATTR_LIST(warning_ratelimit_burst),
	267	ATTR_LIST(msg_ratelimit_interval_ms),
	268	ATTR_LIST(msg_ratelimit_burst),
	269	ATTR_LIST(errors_count),
4549b49f TT	270	ATTR_LIST(first_error_ino),
	271	ATTR_LIST(last_error_ino),
	272	ATTR_LIST(first_error_block),
	273	ATTR_LIST(last_error_block),
	274	ATTR_LIST(first_error_line),
	275	ATTR_LIST(last_error_line),
	276	ATTR_LIST(first_error_func),
	277	ATTR_LIST(last_error_func),
	278	ATTR_LIST(first_error_errcode),
	279	ATTR_LIST(last_error_errcode),
b5799018 TT	280	ATTR_LIST(first_error_time),
b5799018 TT	281	ATTR_LIST(last_error_time),
bc1d69d6	282	ATTR_LIST(journal_task),
46f870d6 TT	283	#ifdef CONFIG_EXT4_DEBUG
	284	ATTR_LIST(simulate_fail),
	285	#endif
b5799018 TT	286	NULL,
b5799018 TT	287	};
78e9605d	288	ATTRIBUTE_GROUPS(ext4);
b5799018 TT	289
b5799018 TT	290	/* Features this copy of ext4 supports */
76d33bca TT	291	EXT4_ATTR_FEATURE(lazy_itable_init);
	292	EXT4_ATTR_FEATURE(batched_discard);
	293	EXT4_ATTR_FEATURE(meta_bg_resize);
643fa961	294	#ifdef CONFIG_FS_ENCRYPTION
76d33bca	295	EXT4_ATTR_FEATURE(encryption);
ed318a6c	296	EXT4_ATTR_FEATURE(test_dummy_encryption_v2);
c4704a4f	297	#endif
db90f419 TT	298	#ifdef CONFIG_UNICODE
	299	EXT4_ATTR_FEATURE(casefold);
	300	#endif
c93d8f88 EB	301	#ifdef CONFIG_FS_VERITY
	302	EXT4_ATTR_FEATURE(verity);
	303	#endif
8c81bd8f	304	EXT4_ATTR_FEATURE(metadata_csum_seed);
b5799018 TT	305
	306	static struct attribute *ext4_feat_attrs[] = {
	307	ATTR_LIST(lazy_itable_init),
	308	ATTR_LIST(batched_discard),
	309	ATTR_LIST(meta_bg_resize),
643fa961	310	#ifdef CONFIG_FS_ENCRYPTION
b5799018	311	ATTR_LIST(encryption),
ed318a6c	312	ATTR_LIST(test_dummy_encryption_v2),
db90f419 TT	313	#endif
	314	#ifdef CONFIG_UNICODE
	315	ATTR_LIST(casefold),
c93d8f88 EB	316	#endif
	317	#ifdef CONFIG_FS_VERITY
	318	ATTR_LIST(verity),
c4704a4f	319	#endif
8c81bd8f	320	ATTR_LIST(metadata_csum_seed),
b5799018 TT	321	NULL,
b5799018 TT	322	};
78e9605d	323	ATTRIBUTE_GROUPS(ext4_feat);
b5799018	324
76d33bca TT	325	static void calc_ptr(struct ext4_attr a, struct ext4_sb_info *sbi)
	326	{
	327	switch (a->attr_ptr) {
	328	case ptr_explicit:
	329	return a->u.explicit_ptr;
	330	case ptr_ext4_sb_info_offset:
	331	return (void ) (((char ) sbi) + a->u.offset);
	332	case ptr_ext4_super_block_offset:
	333	return (void ) (((char ) sbi->s_es) + a->u.offset);
	334	}
	335	return NULL;
	336	}
	337
6a0678a7 AB	338	static ssize_t __print_tstamp(char *buf, __le32 lo, __u8 hi)
6a0678a7 AB	339	{
4549b49f	340	return snprintf(buf, PAGE_SIZE, "%lld\n",
6a0678a7 AB	341	((time64_t)hi << 32) + le32_to_cpu(lo));
	342	}
	343
	344	#define print_tstamp(buf, es, tstamp) \
	345	__print_tstamp(buf, (es)->tstamp, (es)->tstamp ## _hi)
	346
b5799018 TT	347	static ssize_t ext4_attr_show(struct kobject *kobj,
	348	struct attribute attr, char buf)
	349	{
	350	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
	351	s_kobj);
	352	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
76d33bca TT	353	void *ptr = calc_ptr(a, sbi);
	354
	355	switch (a->attr_id) {
	356	case attr_delayed_allocation_blocks:
	357	return snprintf(buf, PAGE_SIZE, "%llu\n",
	358	(s64) EXT4_C2B(sbi,
	359	percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
	360	case attr_session_write_kbytes:
6ca06829	361	return session_write_kbytes_show(sbi, buf);
76d33bca	362	case attr_lifetime_write_kbytes:
6ca06829	363	return lifetime_write_kbytes_show(sbi, buf);
76d33bca TT	364	case attr_reserved_clusters:
	365	return snprintf(buf, PAGE_SIZE, "%llu\n",
	366	(unsigned long long)
	367	atomic64_read(&sbi->s_resv_clusters));
	368	case attr_inode_readahead:
	369	case attr_pointer_ui:
	370	if (!ptr)
	371	return 0;
a4d2aadc AB	372	if (a->attr_ptr == ptr_ext4_super_block_offset)
	373	return snprintf(buf, PAGE_SIZE, "%u\n",
	374	le32_to_cpup(ptr));
	375	else
	376	return snprintf(buf, PAGE_SIZE, "%u\n",
	377	((unsigned int ) ptr));
46f870d6 TT	378	case attr_pointer_ul:
	379	if (!ptr)
	380	return 0;
	381	return snprintf(buf, PAGE_SIZE, "%lu\n",
	382	((unsigned long ) ptr));
4549b49f TT	383	case attr_pointer_u8:
	384	if (!ptr)
	385	return 0;
	386	return snprintf(buf, PAGE_SIZE, "%u\n",
	387	((unsigned char ) ptr));
	388	case attr_pointer_u64:
	389	if (!ptr)
	390	return 0;
	391	if (a->attr_ptr == ptr_ext4_super_block_offset)
	392	return snprintf(buf, PAGE_SIZE, "%llu\n",
	393	le64_to_cpup(ptr));
	394	else
	395	return snprintf(buf, PAGE_SIZE, "%llu\n",
	396	((unsigned long long ) ptr));
	397	case attr_pointer_string:
	398	if (!ptr)
	399	return 0;
	400	return snprintf(buf, PAGE_SIZE, "%.*s\n", a->attr_size,
	401	(char *) ptr);
76d33bca TT	402	case attr_pointer_atomic:
	403	if (!ptr)
	404	return 0;
	405	return snprintf(buf, PAGE_SIZE, "%d\n",
	406	atomic_read((atomic_t *) ptr));
	407	case attr_feature:
	408	return snprintf(buf, PAGE_SIZE, "supported\n");
6a0678a7 AB	409	case attr_first_error_time:
	410	return print_tstamp(buf, sbi->s_es, s_first_error_time);
	411	case attr_last_error_time:
	412	return print_tstamp(buf, sbi->s_es, s_last_error_time);
bc1d69d6 KK	413	case attr_journal_task:
bc1d69d6 KK	414	return journal_task_show(sbi, buf);
76d33bca TT	415	}
	416
	417	return 0;
b5799018 TT	418	}
	419
	420	static ssize_t ext4_attr_store(struct kobject *kobj,
	421	struct attribute *attr,
	422	const char *buf, size_t len)
	423	{
	424	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
	425	s_kobj);
	426	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
76d33bca TT	427	void *ptr = calc_ptr(a, sbi);
	428	unsigned long t;
	429	int ret;
b5799018	430
76d33bca TT	431	switch (a->attr_id) {
76d33bca TT	432	case attr_reserved_clusters:
6ca06829	433	return reserved_clusters_store(sbi, buf, len);
76d33bca TT	434	case attr_pointer_ui:
	435	if (!ptr)
	436	return 0;
	437	ret = kstrtoul(skip_spaces(buf), 0, &t);
	438	if (ret)
	439	return ret;
a4d2aadc AB	440	if (a->attr_ptr == ptr_ext4_super_block_offset)
	441	((__le32 ) ptr) = cpu_to_le32(t);
	442	else
	443	((unsigned int ) ptr) = t;
76d33bca	444	return len;
46f870d6 TT	445	case attr_pointer_ul:
	446	if (!ptr)
	447	return 0;
	448	ret = kstrtoul(skip_spaces(buf), 0, &t);
	449	if (ret)
	450	return ret;
	451	((unsigned long ) ptr) = t;
	452	return len;
76d33bca	453	case attr_inode_readahead:
6ca06829	454	return inode_readahead_blks_store(sbi, buf, len);
76d33bca	455	case attr_trigger_test_error:
6ca06829	456	return trigger_test_error(sbi, buf, len);
76d33bca TT	457	}
76d33bca TT	458	return 0;
b5799018 TT	459	}
	460
	461	static void ext4_sb_release(struct kobject *kobj)
	462	{
	463	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
	464	s_kobj);
	465	complete(&sbi->s_kobj_unregister);
	466	}
	467
	468	static const struct sysfs_ops ext4_attr_ops = {
	469	.show = ext4_attr_show,
	470	.store = ext4_attr_store,
	471	};
	472
	473	static struct kobj_type ext4_sb_ktype = {
78e9605d	474	.default_groups = ext4_groups,
b5799018 TT	475	.sysfs_ops = &ext4_attr_ops,
	476	.release = ext4_sb_release,
	477	};
	478
b5799018	479	static struct kobj_type ext4_feat_ktype = {
78e9605d	480	.default_groups = ext4_feat_groups,
76d33bca	481	.sysfs_ops = &ext4_attr_ops,
b99fee58	482	.release = (void ()(struct kobject ))kfree,
b5799018 TT	483	};
b5799018 TT	484
bc1420ae TN	485	static struct kobject *ext4_root;
bc1420ae TN	486
b99fee58	487	static struct kobject *ext4_feat;
b5799018 TT	488
	489	int ext4_register_sysfs(struct super_block *sb)
	490	{
	491	struct ext4_sb_info *sbi = EXT4_SB(sb);
ebd173be	492	int err;
b5799018	493
b5799018	494	init_completion(&sbi->s_kobj_unregister);
bc1420ae	495	err = kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, ext4_root,
ebd173be	496	"%s", sb->s_id);
95c4df02 RS	497	if (err) {
	498	kobject_put(&sbi->s_kobj);
	499	wait_for_completion(&sbi->s_kobj_unregister);
ebd173be	500	return err;
95c4df02	501	}
ebd173be TT	502
	503	if (ext4_proc_root)
	504	sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
ebd173be	505	if (sbi->s_proc) {
247dbed8 CH	506	proc_create_single_data("options", S_IRUGO, sbi->s_proc,
	507	ext4_seq_options_show, sb);
	508	proc_create_single_data("es_shrinker_info", S_IRUGO,
	509	sbi->s_proc, ext4_seq_es_shrinker_info_show,
	510	sb);
	511	proc_create_seq_data("mb_groups", S_IRUGO, sbi->s_proc,
	512	&ext4_mb_seq_groups_ops, sb);
ebd173be TT	513	}
	514	return 0;
	515	}
	516
	517	void ext4_unregister_sysfs(struct super_block *sb)
	518	{
	519	struct ext4_sb_info *sbi = EXT4_SB(sb);
ebd173be	520
247dbed8 CH	521	if (sbi->s_proc)
247dbed8 CH	522	remove_proc_subtree(sb->s_id, ext4_proc_root);
ebd173be	523	kobject_del(&sbi->s_kobj);
b5799018 TT	524	}
	525
	526	int __init ext4_init_sysfs(void)
	527	{
	528	int ret;
	529
bc1420ae TN	530	ext4_root = kobject_create_and_add("ext4", fs_kobj);
bc1420ae TN	531	if (!ext4_root)
5dc39711 RS	532	return -ENOMEM;
5dc39711 RS	533
b99fee58 RS	534	ext4_feat = kzalloc(sizeof(*ext4_feat), GFP_KERNEL);
	535	if (!ext4_feat) {
	536	ret = -ENOMEM;
bc1420ae	537	goto root_err;
95c4df02	538	}
b99fee58	539
b99fee58	540	ret = kobject_init_and_add(ext4_feat, &ext4_feat_ktype,
bc1420ae	541	ext4_root, "features");
b99fee58 RS	542	if (ret)
	543	goto feat_err;
	544
	545	ext4_proc_root = proc_mkdir(proc_dirname, NULL);
	546	return ret;
	547
	548	feat_err:
	549	kobject_put(ext4_feat);
c2e5df76	550	ext4_feat = NULL;
bc1420ae TN	551	root_err:
	552	kobject_put(ext4_root);
	553	ext4_root = NULL;
b5799018 TT	554	return ret;
	555	}
	556
	557	void ext4_exit_sysfs(void)
	558	{
b99fee58	559	kobject_put(ext4_feat);
c2e5df76	560	ext4_feat = NULL;
bc1420ae TN	561	kobject_put(ext4_root);
bc1420ae TN	562	ext4_root = NULL;
ebd173be TT	563	remove_proc_entry(proc_dirname, NULL);
ebd173be TT	564	ext4_proc_root = NULL;
b5799018 TT	565	}
b5799018 TT	566