[linux.git] / fs / ext4 / sysfs.c

// SPDX-License-Identifier: GPL-2.0
/*
 *  linux/fs/ext4/sysfs.c
 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card ([email protected])
 * Theodore Ts'o ([email protected])
 *
 */

#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;

	return snprintf(buf, PAGE_SIZE, "%lu\n",
			(part_stat_read(sb->s_bdev, 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;

	return snprintf(buf, PAGE_SIZE, "%llu\n",
			(unsigned long long)(sbi->s_kbytes_written +
			((part_stat_read(sb->s_bdev, 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_RO_ATTR_SBI_ATOMIC(_name,_elname)	\
	EXT4_ATTR_OFFSET(_name, 0444, pointer_atomic, 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(mb_max_inode_prealloc, s_mb_max_inode_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_SBI_ATOMIC(warning_count, s_warning_count);
EXT4_RO_ATTR_SBI_ATOMIC(msg_count, s_msg_count);
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);
EXT4_RW_ATTR_SBI_UI(mb_prefetch, s_mb_prefetch);
EXT4_RW_ATTR_SBI_UI(mb_prefetch_limit, s_mb_prefetch_limit);

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(mb_max_inode_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(warning_count),
	ATTR_LIST(msg_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
	ATTR_LIST(mb_prefetch),
	ATTR_LIST(mb_prefetch_limit),
	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);
EXT4_ATTR_FEATURE(fast_commit);

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),
	ATTR_LIST(fast_commit),
	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_single_data("fc_info", 0444, sbi->s_proc,
					ext4_fc_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 ([email protected])
	7	* Theodore Ts'o ([email protected])
	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
b5799018	65	return snprintf(buf, PAGE_SIZE, "%lu\n",
8446fe92	66	(part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) -
b5799018 TT	67	sbi->s_sectors_written_start) >> 1);
	68	}
	69
6ca06829	70	static ssize_t lifetime_write_kbytes_show(struct ext4_sb_info sbi, char buf)
b5799018 TT	71	{
	72	struct super_block *sb = sbi->s_buddy_cache->i_sb;
	73
b5799018 TT	74	return snprintf(buf, PAGE_SIZE, "%llu\n",
b5799018 TT	75	(unsigned long long)(sbi->s_kbytes_written +
8446fe92	76	((part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) -
b5799018 TT	77	EXT4_SB(sb)->s_sectors_written_start) >> 1)));
	78	}
	79
6ca06829	80	static ssize_t inode_readahead_blks_store(struct ext4_sb_info *sbi,
b5799018 TT	81	const char *buf, size_t count)
	82	{
	83	unsigned long t;
	84	int ret;
	85
	86	ret = kstrtoul(skip_spaces(buf), 0, &t);
	87	if (ret)
	88	return ret;
	89
	90	if (t && (!is_power_of_2(t) \|\| t > 0x40000000))
	91	return -EINVAL;
	92
	93	sbi->s_inode_readahead_blks = t;
	94	return count;
	95	}
	96
6ca06829	97	static ssize_t reserved_clusters_store(struct ext4_sb_info *sbi,
b5799018 TT	98	const char *buf, size_t count)
	99	{
	100	unsigned long long val;
	101	ext4_fsblk_t clusters = (ext4_blocks_count(sbi->s_es) >>
	102	sbi->s_cluster_bits);
76d33bca	103	int ret;
b5799018	104
76d33bca	105	ret = kstrtoull(skip_spaces(buf), 0, &val);
1ea1516f	106	if (ret \|\| val >= clusters)
b5799018 TT	107	return -EINVAL;
	108
	109	atomic64_set(&sbi->s_resv_clusters, val);
	110	return count;
	111	}
	112
6ca06829	113	static ssize_t trigger_test_error(struct ext4_sb_info *sbi,
b5799018 TT	114	const char *buf, size_t count)
	115	{
	116	int len = count;
	117
	118	if (!capable(CAP_SYS_ADMIN))
	119	return -EPERM;
	120
	121	if (len && buf[len-1] == '\n')
	122	len--;
	123
	124	if (len)
	125	ext4_error(sbi->s_sb, "%.*s", len, buf);
	126	return count;
	127	}
	128
bc1d69d6 KK	129	static ssize_t journal_task_show(struct ext4_sb_info sbi, char buf)
	130	{
	131	if (!sbi->s_journal)
	132	return snprintf(buf, PAGE_SIZE, "<none>\n");
	133	return snprintf(buf, PAGE_SIZE, "%d\n",
	134	task_pid_vnr(sbi->s_journal->j_task));
	135	}
	136
76d33bca TT	137	#define EXT4_ATTR(_name,_mode,_id) \
	138	static struct ext4_attr ext4_attr_##_name = { \
	139	.attr = {.name = __stringify(_name), .mode = _mode }, \
	140	.attr_id = attr_##_id, \
b5799018 TT	141	}
b5799018 TT	142
76d33bca TT	143	#define EXT4_ATTR_FUNC(_name,_mode) EXT4_ATTR(_name,_mode,_name)
	144
	145	#define EXT4_ATTR_FEATURE(_name) EXT4_ATTR(_name, 0444, feature)
	146
	147	#define EXT4_ATTR_OFFSET(_name,_mode,_id,_struct,_elname) \
b5799018 TT	148	static struct ext4_attr ext4_attr_##_name = { \
b5799018 TT	149	.attr = {.name = __stringify(_name), .mode = _mode }, \
76d33bca TT	150	.attr_id = attr_##_id, \
76d33bca TT	151	.attr_ptr = ptr_##_struct##_offset, \
b5799018	152	.u = { \
76d33bca	153	.offset = offsetof(struct _struct, _elname),\
b5799018 TT	154	}, \
	155	}
	156
4549b49f TT	157	#define EXT4_ATTR_STRING(_name,_mode,_size,_struct,_elname) \
	158	static struct ext4_attr ext4_attr_##_name = { \
	159	.attr = {.name = __stringify(_name), .mode = _mode }, \
	160	.attr_id = attr_pointer_string, \
	161	.attr_size = _size, \
	162	.attr_ptr = ptr_##_struct##_offset, \
	163	.u = { \
	164	.offset = offsetof(struct _struct, _elname),\
	165	}, \
	166	}
	167
76d33bca TT	168	#define EXT4_RO_ATTR_ES_UI(_name,_elname) \
76d33bca TT	169	EXT4_ATTR_OFFSET(_name, 0444, pointer_ui, ext4_super_block, _elname)
b5799018	170
4549b49f TT	171	#define EXT4_RO_ATTR_ES_U8(_name,_elname) \
	172	EXT4_ATTR_OFFSET(_name, 0444, pointer_u8, ext4_super_block, _elname)
	173
	174	#define EXT4_RO_ATTR_ES_U64(_name,_elname) \
	175	EXT4_ATTR_OFFSET(_name, 0444, pointer_u64, ext4_super_block, _elname)
	176
	177	#define EXT4_RO_ATTR_ES_STRING(_name,_elname,_size) \
	178	EXT4_ATTR_STRING(_name, 0444, _size, ext4_super_block, _elname)
	179
76d33bca TT	180	#define EXT4_RW_ATTR_SBI_UI(_name,_elname) \
76d33bca TT	181	EXT4_ATTR_OFFSET(_name, 0644, pointer_ui, ext4_sb_info, _elname)
b5799018	182
46f870d6 TT	183	#define EXT4_RW_ATTR_SBI_UL(_name,_elname) \
	184	EXT4_ATTR_OFFSET(_name, 0644, pointer_ul, ext4_sb_info, _elname)
	185
1cf006ed DM	186	#define EXT4_RO_ATTR_SBI_ATOMIC(_name,_elname) \
	187	EXT4_ATTR_OFFSET(_name, 0444, pointer_atomic, ext4_sb_info, _elname)
	188
76d33bca	189	#define EXT4_ATTR_PTR(_name,_mode,_id,_ptr) \
b5799018	190	static struct ext4_attr ext4_attr_##_name = { \
76d33bca TT	191	.attr = {.name = __stringify(_name), .mode = _mode }, \
	192	.attr_id = attr_##_id, \
	193	.attr_ptr = ptr_explicit, \
b5799018	194	.u = { \
76d33bca	195	.explicit_ptr = _ptr, \
b5799018 TT	196	}, \
	197	}
	198
76d33bca TT	199	#define ATTR_LIST(name) &ext4_attr_##name.attr
	200
	201	EXT4_ATTR_FUNC(delayed_allocation_blocks, 0444);
	202	EXT4_ATTR_FUNC(session_write_kbytes, 0444);
	203	EXT4_ATTR_FUNC(lifetime_write_kbytes, 0444);
	204	EXT4_ATTR_FUNC(reserved_clusters, 0644);
	205
	206	EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, inode_readahead,
	207	ext4_sb_info, s_inode_readahead_blks);
b5799018 TT	208	EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
	209	EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
	210	EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
	211	EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
	212	EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
	213	EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
	214	EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
27bc446e	215	EXT4_RW_ATTR_SBI_UI(mb_max_inode_prealloc, s_mb_max_inode_prealloc);
b5799018	216	EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
76d33bca	217	EXT4_ATTR(trigger_fs_error, 0200, trigger_test_error);
b5799018 TT	218	EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
	219	EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
	220	EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
	221	EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
	222	EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
	223	EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
46f870d6 TT	224	#ifdef CONFIG_EXT4_DEBUG
	225	EXT4_RW_ATTR_SBI_UL(simulate_fail, s_simulate_fail);
	226	#endif
1cf006ed DM	227	EXT4_RO_ATTR_SBI_ATOMIC(warning_count, s_warning_count);
1cf006ed DM	228	EXT4_RO_ATTR_SBI_ATOMIC(msg_count, s_msg_count);
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);
cfd73237 AZ	243	EXT4_RW_ATTR_SBI_UI(mb_prefetch, s_mb_prefetch);
cfd73237 AZ	244	EXT4_RW_ATTR_SBI_UI(mb_prefetch_limit, s_mb_prefetch_limit);
b5799018	245
76d33bca TT	246	static unsigned int old_bump_val = 128;
	247	EXT4_ATTR_PTR(max_writeback_mb_bump, 0444, pointer_ui, &old_bump_val);
	248
b5799018 TT	249	static struct attribute *ext4_attrs[] = {
	250	ATTR_LIST(delayed_allocation_blocks),
	251	ATTR_LIST(session_write_kbytes),
	252	ATTR_LIST(lifetime_write_kbytes),
	253	ATTR_LIST(reserved_clusters),
	254	ATTR_LIST(inode_readahead_blks),
	255	ATTR_LIST(inode_goal),
	256	ATTR_LIST(mb_stats),
	257	ATTR_LIST(mb_max_to_scan),
	258	ATTR_LIST(mb_min_to_scan),
	259	ATTR_LIST(mb_order2_req),
	260	ATTR_LIST(mb_stream_req),
	261	ATTR_LIST(mb_group_prealloc),
27bc446e	262	ATTR_LIST(mb_max_inode_prealloc),
b5799018 TT	263	ATTR_LIST(max_writeback_mb_bump),
	264	ATTR_LIST(extent_max_zeroout_kb),
	265	ATTR_LIST(trigger_fs_error),
	266	ATTR_LIST(err_ratelimit_interval_ms),
	267	ATTR_LIST(err_ratelimit_burst),
	268	ATTR_LIST(warning_ratelimit_interval_ms),
	269	ATTR_LIST(warning_ratelimit_burst),
	270	ATTR_LIST(msg_ratelimit_interval_ms),
	271	ATTR_LIST(msg_ratelimit_burst),
	272	ATTR_LIST(errors_count),
1cf006ed DM	273	ATTR_LIST(warning_count),
1cf006ed DM	274	ATTR_LIST(msg_count),
4549b49f TT	275	ATTR_LIST(first_error_ino),
	276	ATTR_LIST(last_error_ino),
	277	ATTR_LIST(first_error_block),
	278	ATTR_LIST(last_error_block),
	279	ATTR_LIST(first_error_line),
	280	ATTR_LIST(last_error_line),
	281	ATTR_LIST(first_error_func),
	282	ATTR_LIST(last_error_func),
	283	ATTR_LIST(first_error_errcode),
	284	ATTR_LIST(last_error_errcode),
b5799018 TT	285	ATTR_LIST(first_error_time),
b5799018 TT	286	ATTR_LIST(last_error_time),
bc1d69d6	287	ATTR_LIST(journal_task),
46f870d6 TT	288	#ifdef CONFIG_EXT4_DEBUG
	289	ATTR_LIST(simulate_fail),
	290	#endif
cfd73237 AZ	291	ATTR_LIST(mb_prefetch),
cfd73237 AZ	292	ATTR_LIST(mb_prefetch_limit),
b5799018 TT	293	NULL,
b5799018 TT	294	};
78e9605d	295	ATTRIBUTE_GROUPS(ext4);
b5799018 TT	296
b5799018 TT	297	/* Features this copy of ext4 supports */
76d33bca TT	298	EXT4_ATTR_FEATURE(lazy_itable_init);
	299	EXT4_ATTR_FEATURE(batched_discard);
	300	EXT4_ATTR_FEATURE(meta_bg_resize);
643fa961	301	#ifdef CONFIG_FS_ENCRYPTION
76d33bca	302	EXT4_ATTR_FEATURE(encryption);
ed318a6c	303	EXT4_ATTR_FEATURE(test_dummy_encryption_v2);
c4704a4f	304	#endif
db90f419 TT	305	#ifdef CONFIG_UNICODE
	306	EXT4_ATTR_FEATURE(casefold);
	307	#endif
c93d8f88 EB	308	#ifdef CONFIG_FS_VERITY
	309	EXT4_ATTR_FEATURE(verity);
	310	#endif
8c81bd8f	311	EXT4_ATTR_FEATURE(metadata_csum_seed);
6694875e	312	EXT4_ATTR_FEATURE(fast_commit);
b5799018 TT	313
	314	static struct attribute *ext4_feat_attrs[] = {
	315	ATTR_LIST(lazy_itable_init),
	316	ATTR_LIST(batched_discard),
	317	ATTR_LIST(meta_bg_resize),
643fa961	318	#ifdef CONFIG_FS_ENCRYPTION
b5799018	319	ATTR_LIST(encryption),
ed318a6c	320	ATTR_LIST(test_dummy_encryption_v2),
db90f419 TT	321	#endif
	322	#ifdef CONFIG_UNICODE
	323	ATTR_LIST(casefold),
c93d8f88 EB	324	#endif
	325	#ifdef CONFIG_FS_VERITY
	326	ATTR_LIST(verity),
c4704a4f	327	#endif
8c81bd8f	328	ATTR_LIST(metadata_csum_seed),
6694875e	329	ATTR_LIST(fast_commit),
b5799018 TT	330	NULL,
b5799018 TT	331	};
78e9605d	332	ATTRIBUTE_GROUPS(ext4_feat);
b5799018	333
76d33bca TT	334	static void calc_ptr(struct ext4_attr a, struct ext4_sb_info *sbi)
	335	{
	336	switch (a->attr_ptr) {
	337	case ptr_explicit:
	338	return a->u.explicit_ptr;
	339	case ptr_ext4_sb_info_offset:
	340	return (void ) (((char ) sbi) + a->u.offset);
	341	case ptr_ext4_super_block_offset:
	342	return (void ) (((char ) sbi->s_es) + a->u.offset);
	343	}
	344	return NULL;
	345	}
	346
6a0678a7 AB	347	static ssize_t __print_tstamp(char *buf, __le32 lo, __u8 hi)
6a0678a7 AB	348	{
4549b49f	349	return snprintf(buf, PAGE_SIZE, "%lld\n",
6a0678a7 AB	350	((time64_t)hi << 32) + le32_to_cpu(lo));
	351	}
	352
	353	#define print_tstamp(buf, es, tstamp) \
	354	__print_tstamp(buf, (es)->tstamp, (es)->tstamp ## _hi)
	355
b5799018 TT	356	static ssize_t ext4_attr_show(struct kobject *kobj,
	357	struct attribute attr, char buf)
	358	{
	359	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
	360	s_kobj);
	361	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
76d33bca TT	362	void *ptr = calc_ptr(a, sbi);
	363
	364	switch (a->attr_id) {
	365	case attr_delayed_allocation_blocks:
	366	return snprintf(buf, PAGE_SIZE, "%llu\n",
	367	(s64) EXT4_C2B(sbi,
	368	percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
	369	case attr_session_write_kbytes:
6ca06829	370	return session_write_kbytes_show(sbi, buf);
76d33bca	371	case attr_lifetime_write_kbytes:
6ca06829	372	return lifetime_write_kbytes_show(sbi, buf);
76d33bca TT	373	case attr_reserved_clusters:
	374	return snprintf(buf, PAGE_SIZE, "%llu\n",
	375	(unsigned long long)
	376	atomic64_read(&sbi->s_resv_clusters));
	377	case attr_inode_readahead:
	378	case attr_pointer_ui:
	379	if (!ptr)
	380	return 0;
a4d2aadc AB	381	if (a->attr_ptr == ptr_ext4_super_block_offset)
	382	return snprintf(buf, PAGE_SIZE, "%u\n",
	383	le32_to_cpup(ptr));
	384	else
	385	return snprintf(buf, PAGE_SIZE, "%u\n",
	386	((unsigned int ) ptr));
46f870d6 TT	387	case attr_pointer_ul:
	388	if (!ptr)
	389	return 0;
	390	return snprintf(buf, PAGE_SIZE, "%lu\n",
	391	((unsigned long ) ptr));
4549b49f TT	392	case attr_pointer_u8:
	393	if (!ptr)
	394	return 0;
	395	return snprintf(buf, PAGE_SIZE, "%u\n",
	396	((unsigned char ) ptr));
	397	case attr_pointer_u64:
	398	if (!ptr)
	399	return 0;
	400	if (a->attr_ptr == ptr_ext4_super_block_offset)
	401	return snprintf(buf, PAGE_SIZE, "%llu\n",
	402	le64_to_cpup(ptr));
	403	else
	404	return snprintf(buf, PAGE_SIZE, "%llu\n",
	405	((unsigned long long ) ptr));
	406	case attr_pointer_string:
	407	if (!ptr)
	408	return 0;
	409	return snprintf(buf, PAGE_SIZE, "%.*s\n", a->attr_size,
	410	(char *) ptr);
76d33bca TT	411	case attr_pointer_atomic:
	412	if (!ptr)
	413	return 0;
	414	return snprintf(buf, PAGE_SIZE, "%d\n",
	415	atomic_read((atomic_t *) ptr));
	416	case attr_feature:
	417	return snprintf(buf, PAGE_SIZE, "supported\n");
6a0678a7 AB	418	case attr_first_error_time:
	419	return print_tstamp(buf, sbi->s_es, s_first_error_time);
	420	case attr_last_error_time:
	421	return print_tstamp(buf, sbi->s_es, s_last_error_time);
bc1d69d6 KK	422	case attr_journal_task:
bc1d69d6 KK	423	return journal_task_show(sbi, buf);
76d33bca TT	424	}
	425
	426	return 0;
b5799018 TT	427	}
	428
	429	static ssize_t ext4_attr_store(struct kobject *kobj,
	430	struct attribute *attr,
	431	const char *buf, size_t len)
	432	{
	433	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
	434	s_kobj);
	435	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
76d33bca TT	436	void *ptr = calc_ptr(a, sbi);
	437	unsigned long t;
	438	int ret;
b5799018	439
76d33bca TT	440	switch (a->attr_id) {
76d33bca TT	441	case attr_reserved_clusters:
6ca06829	442	return reserved_clusters_store(sbi, buf, len);
76d33bca TT	443	case attr_pointer_ui:
	444	if (!ptr)
	445	return 0;
	446	ret = kstrtoul(skip_spaces(buf), 0, &t);
	447	if (ret)
	448	return ret;
a4d2aadc AB	449	if (a->attr_ptr == ptr_ext4_super_block_offset)
	450	((__le32 ) ptr) = cpu_to_le32(t);
	451	else
	452	((unsigned int ) ptr) = t;
76d33bca	453	return len;
46f870d6 TT	454	case attr_pointer_ul:
	455	if (!ptr)
	456	return 0;
	457	ret = kstrtoul(skip_spaces(buf), 0, &t);
	458	if (ret)
	459	return ret;
	460	((unsigned long ) ptr) = t;
	461	return len;
76d33bca	462	case attr_inode_readahead:
6ca06829	463	return inode_readahead_blks_store(sbi, buf, len);
76d33bca	464	case attr_trigger_test_error:
6ca06829	465	return trigger_test_error(sbi, buf, len);
76d33bca TT	466	}
76d33bca TT	467	return 0;
b5799018 TT	468	}
	469
	470	static void ext4_sb_release(struct kobject *kobj)
	471	{
	472	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
	473	s_kobj);
	474	complete(&sbi->s_kobj_unregister);
	475	}
	476
	477	static const struct sysfs_ops ext4_attr_ops = {
	478	.show = ext4_attr_show,
	479	.store = ext4_attr_store,
	480	};
	481
	482	static struct kobj_type ext4_sb_ktype = {
78e9605d	483	.default_groups = ext4_groups,
b5799018 TT	484	.sysfs_ops = &ext4_attr_ops,
	485	.release = ext4_sb_release,
	486	};
	487
b5799018	488	static struct kobj_type ext4_feat_ktype = {
78e9605d	489	.default_groups = ext4_feat_groups,
76d33bca	490	.sysfs_ops = &ext4_attr_ops,
b99fee58	491	.release = (void ()(struct kobject ))kfree,
b5799018 TT	492	};
b5799018 TT	493
bc1420ae TN	494	static struct kobject *ext4_root;
bc1420ae TN	495
b99fee58	496	static struct kobject *ext4_feat;
b5799018 TT	497
	498	int ext4_register_sysfs(struct super_block *sb)
	499	{
	500	struct ext4_sb_info *sbi = EXT4_SB(sb);
ebd173be	501	int err;
b5799018	502
b5799018	503	init_completion(&sbi->s_kobj_unregister);
bc1420ae	504	err = kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, ext4_root,
ebd173be	505	"%s", sb->s_id);
95c4df02 RS	506	if (err) {
	507	kobject_put(&sbi->s_kobj);
	508	wait_for_completion(&sbi->s_kobj_unregister);
ebd173be	509	return err;
95c4df02	510	}
ebd173be TT	511
	512	if (ext4_proc_root)
	513	sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
ebd173be	514	if (sbi->s_proc) {
247dbed8 CH	515	proc_create_single_data("options", S_IRUGO, sbi->s_proc,
	516	ext4_seq_options_show, sb);
	517	proc_create_single_data("es_shrinker_info", S_IRUGO,
	518	sbi->s_proc, ext4_seq_es_shrinker_info_show,
	519	sb);
ce8c59d1 HS	520	proc_create_single_data("fc_info", 0444, sbi->s_proc,
ce8c59d1 HS	521	ext4_fc_info_show, sb);
247dbed8 CH	522	proc_create_seq_data("mb_groups", S_IRUGO, sbi->s_proc,
247dbed8 CH	523	&ext4_mb_seq_groups_ops, sb);
ebd173be TT	524	}
	525	return 0;
	526	}
	527
	528	void ext4_unregister_sysfs(struct super_block *sb)
	529	{
	530	struct ext4_sb_info *sbi = EXT4_SB(sb);
ebd173be	531
247dbed8 CH	532	if (sbi->s_proc)
247dbed8 CH	533	remove_proc_subtree(sb->s_id, ext4_proc_root);
ebd173be	534	kobject_del(&sbi->s_kobj);
b5799018 TT	535	}
	536
	537	int __init ext4_init_sysfs(void)
	538	{
	539	int ret;
	540
bc1420ae TN	541	ext4_root = kobject_create_and_add("ext4", fs_kobj);
bc1420ae TN	542	if (!ext4_root)
5dc39711 RS	543	return -ENOMEM;
5dc39711 RS	544
b99fee58 RS	545	ext4_feat = kzalloc(sizeof(*ext4_feat), GFP_KERNEL);
	546	if (!ext4_feat) {
	547	ret = -ENOMEM;
bc1420ae	548	goto root_err;
95c4df02	549	}
b99fee58	550
b99fee58	551	ret = kobject_init_and_add(ext4_feat, &ext4_feat_ktype,
bc1420ae	552	ext4_root, "features");
b99fee58 RS	553	if (ret)
	554	goto feat_err;
	555
	556	ext4_proc_root = proc_mkdir(proc_dirname, NULL);
	557	return ret;
	558
	559	feat_err:
	560	kobject_put(ext4_feat);
c2e5df76	561	ext4_feat = NULL;
bc1420ae TN	562	root_err:
	563	kobject_put(ext4_root);
	564	ext4_root = NULL;
b5799018 TT	565	return ret;
	566	}
	567
	568	void ext4_exit_sysfs(void)
	569	{
b99fee58	570	kobject_put(ext4_feat);
c2e5df76	571	ext4_feat = NULL;
bc1420ae TN	572	kobject_put(ext4_root);
bc1420ae TN	573	ext4_root = NULL;
ebd173be TT	574	remove_proc_entry(proc_dirname, NULL);
ebd173be TT	575	ext4_proc_root = NULL;
b5799018 TT	576	}
b5799018 TT	577