[linux-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_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 (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
1cf006ed DM	192	#define EXT4_RO_ATTR_SBI_ATOMIC(_name,_elname) \
	193	EXT4_ATTR_OFFSET(_name, 0444, pointer_atomic, ext4_sb_info, _elname)
	194
76d33bca	195	#define EXT4_ATTR_PTR(_name,_mode,_id,_ptr) \
b5799018	196	static struct ext4_attr ext4_attr_##_name = { \
76d33bca TT	197	.attr = {.name = __stringify(_name), .mode = _mode }, \
	198	.attr_id = attr_##_id, \
	199	.attr_ptr = ptr_explicit, \
b5799018	200	.u = { \
76d33bca	201	.explicit_ptr = _ptr, \
b5799018 TT	202	}, \
	203	}
	204
76d33bca TT	205	#define ATTR_LIST(name) &ext4_attr_##name.attr
	206
	207	EXT4_ATTR_FUNC(delayed_allocation_blocks, 0444);
	208	EXT4_ATTR_FUNC(session_write_kbytes, 0444);
	209	EXT4_ATTR_FUNC(lifetime_write_kbytes, 0444);
	210	EXT4_ATTR_FUNC(reserved_clusters, 0644);
	211
	212	EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, inode_readahead,
	213	ext4_sb_info, s_inode_readahead_blks);
b5799018 TT	214	EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
	215	EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
	216	EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
	217	EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
	218	EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
	219	EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
	220	EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
27bc446e	221	EXT4_RW_ATTR_SBI_UI(mb_max_inode_prealloc, s_mb_max_inode_prealloc);
b5799018	222	EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
76d33bca	223	EXT4_ATTR(trigger_fs_error, 0200, trigger_test_error);
b5799018 TT	224	EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
	225	EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
	226	EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
	227	EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
	228	EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
	229	EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
46f870d6 TT	230	#ifdef CONFIG_EXT4_DEBUG
	231	EXT4_RW_ATTR_SBI_UL(simulate_fail, s_simulate_fail);
	232	#endif
1cf006ed DM	233	EXT4_RO_ATTR_SBI_ATOMIC(warning_count, s_warning_count);
1cf006ed DM	234	EXT4_RO_ATTR_SBI_ATOMIC(msg_count, s_msg_count);
b5799018	235	EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
4549b49f TT	236	EXT4_RO_ATTR_ES_U8(first_error_errcode, s_first_error_errcode);
	237	EXT4_RO_ATTR_ES_U8(last_error_errcode, s_last_error_errcode);
	238	EXT4_RO_ATTR_ES_UI(first_error_ino, s_first_error_ino);
	239	EXT4_RO_ATTR_ES_UI(last_error_ino, s_last_error_ino);
	240	EXT4_RO_ATTR_ES_U64(first_error_block, s_first_error_block);
	241	EXT4_RO_ATTR_ES_U64(last_error_block, s_last_error_block);
	242	EXT4_RO_ATTR_ES_UI(first_error_line, s_first_error_line);
	243	EXT4_RO_ATTR_ES_UI(last_error_line, s_last_error_line);
	244	EXT4_RO_ATTR_ES_STRING(first_error_func, s_first_error_func, 32);
	245	EXT4_RO_ATTR_ES_STRING(last_error_func, s_last_error_func, 32);
6a0678a7 AB	246	EXT4_ATTR(first_error_time, 0444, first_error_time);
6a0678a7 AB	247	EXT4_ATTR(last_error_time, 0444, last_error_time);
bc1d69d6	248	EXT4_ATTR(journal_task, 0444, journal_task);
cfd73237 AZ	249	EXT4_RW_ATTR_SBI_UI(mb_prefetch, s_mb_prefetch);
cfd73237 AZ	250	EXT4_RW_ATTR_SBI_UI(mb_prefetch_limit, s_mb_prefetch_limit);
b5799018	251
76d33bca TT	252	static unsigned int old_bump_val = 128;
	253	EXT4_ATTR_PTR(max_writeback_mb_bump, 0444, pointer_ui, &old_bump_val);
	254
b5799018 TT	255	static struct attribute *ext4_attrs[] = {
	256	ATTR_LIST(delayed_allocation_blocks),
	257	ATTR_LIST(session_write_kbytes),
	258	ATTR_LIST(lifetime_write_kbytes),
	259	ATTR_LIST(reserved_clusters),
	260	ATTR_LIST(inode_readahead_blks),
	261	ATTR_LIST(inode_goal),
	262	ATTR_LIST(mb_stats),
	263	ATTR_LIST(mb_max_to_scan),
	264	ATTR_LIST(mb_min_to_scan),
	265	ATTR_LIST(mb_order2_req),
	266	ATTR_LIST(mb_stream_req),
	267	ATTR_LIST(mb_group_prealloc),
27bc446e	268	ATTR_LIST(mb_max_inode_prealloc),
b5799018 TT	269	ATTR_LIST(max_writeback_mb_bump),
	270	ATTR_LIST(extent_max_zeroout_kb),
	271	ATTR_LIST(trigger_fs_error),
	272	ATTR_LIST(err_ratelimit_interval_ms),
	273	ATTR_LIST(err_ratelimit_burst),
	274	ATTR_LIST(warning_ratelimit_interval_ms),
	275	ATTR_LIST(warning_ratelimit_burst),
	276	ATTR_LIST(msg_ratelimit_interval_ms),
	277	ATTR_LIST(msg_ratelimit_burst),
	278	ATTR_LIST(errors_count),
1cf006ed DM	279	ATTR_LIST(warning_count),
1cf006ed DM	280	ATTR_LIST(msg_count),
4549b49f TT	281	ATTR_LIST(first_error_ino),
	282	ATTR_LIST(last_error_ino),
	283	ATTR_LIST(first_error_block),
	284	ATTR_LIST(last_error_block),
	285	ATTR_LIST(first_error_line),
	286	ATTR_LIST(last_error_line),
	287	ATTR_LIST(first_error_func),
	288	ATTR_LIST(last_error_func),
	289	ATTR_LIST(first_error_errcode),
	290	ATTR_LIST(last_error_errcode),
b5799018 TT	291	ATTR_LIST(first_error_time),
b5799018 TT	292	ATTR_LIST(last_error_time),
bc1d69d6	293	ATTR_LIST(journal_task),
46f870d6 TT	294	#ifdef CONFIG_EXT4_DEBUG
	295	ATTR_LIST(simulate_fail),
	296	#endif
cfd73237 AZ	297	ATTR_LIST(mb_prefetch),
cfd73237 AZ	298	ATTR_LIST(mb_prefetch_limit),
b5799018 TT	299	NULL,
b5799018 TT	300	};
78e9605d	301	ATTRIBUTE_GROUPS(ext4);
b5799018 TT	302
b5799018 TT	303	/* Features this copy of ext4 supports */
76d33bca TT	304	EXT4_ATTR_FEATURE(lazy_itable_init);
	305	EXT4_ATTR_FEATURE(batched_discard);
	306	EXT4_ATTR_FEATURE(meta_bg_resize);
643fa961	307	#ifdef CONFIG_FS_ENCRYPTION
76d33bca	308	EXT4_ATTR_FEATURE(encryption);
ed318a6c	309	EXT4_ATTR_FEATURE(test_dummy_encryption_v2);
c4704a4f	310	#endif
db90f419 TT	311	#ifdef CONFIG_UNICODE
	312	EXT4_ATTR_FEATURE(casefold);
	313	#endif
c93d8f88 EB	314	#ifdef CONFIG_FS_VERITY
	315	EXT4_ATTR_FEATURE(verity);
	316	#endif
8c81bd8f	317	EXT4_ATTR_FEATURE(metadata_csum_seed);
6694875e	318	EXT4_ATTR_FEATURE(fast_commit);
b5799018 TT	319
	320	static struct attribute *ext4_feat_attrs[] = {
	321	ATTR_LIST(lazy_itable_init),
	322	ATTR_LIST(batched_discard),
	323	ATTR_LIST(meta_bg_resize),
643fa961	324	#ifdef CONFIG_FS_ENCRYPTION
b5799018	325	ATTR_LIST(encryption),
ed318a6c	326	ATTR_LIST(test_dummy_encryption_v2),
db90f419 TT	327	#endif
	328	#ifdef CONFIG_UNICODE
	329	ATTR_LIST(casefold),
c93d8f88 EB	330	#endif
	331	#ifdef CONFIG_FS_VERITY
	332	ATTR_LIST(verity),
c4704a4f	333	#endif
8c81bd8f	334	ATTR_LIST(metadata_csum_seed),
6694875e	335	ATTR_LIST(fast_commit),
b5799018 TT	336	NULL,
b5799018 TT	337	};
78e9605d	338	ATTRIBUTE_GROUPS(ext4_feat);
b5799018	339
76d33bca TT	340	static void calc_ptr(struct ext4_attr a, struct ext4_sb_info *sbi)
	341	{
	342	switch (a->attr_ptr) {
	343	case ptr_explicit:
	344	return a->u.explicit_ptr;
	345	case ptr_ext4_sb_info_offset:
	346	return (void ) (((char ) sbi) + a->u.offset);
	347	case ptr_ext4_super_block_offset:
	348	return (void ) (((char ) sbi->s_es) + a->u.offset);
	349	}
	350	return NULL;
	351	}
	352
6a0678a7 AB	353	static ssize_t __print_tstamp(char *buf, __le32 lo, __u8 hi)
6a0678a7 AB	354	{
4549b49f	355	return snprintf(buf, PAGE_SIZE, "%lld\n",
6a0678a7 AB	356	((time64_t)hi << 32) + le32_to_cpu(lo));
	357	}
	358
	359	#define print_tstamp(buf, es, tstamp) \
	360	__print_tstamp(buf, (es)->tstamp, (es)->tstamp ## _hi)
	361
b5799018 TT	362	static ssize_t ext4_attr_show(struct kobject *kobj,
	363	struct attribute attr, char buf)
	364	{
	365	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
	366	s_kobj);
	367	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
76d33bca TT	368	void *ptr = calc_ptr(a, sbi);
	369
	370	switch (a->attr_id) {
	371	case attr_delayed_allocation_blocks:
	372	return snprintf(buf, PAGE_SIZE, "%llu\n",
	373	(s64) EXT4_C2B(sbi,
	374	percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
	375	case attr_session_write_kbytes:
6ca06829	376	return session_write_kbytes_show(sbi, buf);
76d33bca	377	case attr_lifetime_write_kbytes:
6ca06829	378	return lifetime_write_kbytes_show(sbi, buf);
76d33bca TT	379	case attr_reserved_clusters:
	380	return snprintf(buf, PAGE_SIZE, "%llu\n",
	381	(unsigned long long)
	382	atomic64_read(&sbi->s_resv_clusters));
	383	case attr_inode_readahead:
	384	case attr_pointer_ui:
	385	if (!ptr)
	386	return 0;
a4d2aadc AB	387	if (a->attr_ptr == ptr_ext4_super_block_offset)
	388	return snprintf(buf, PAGE_SIZE, "%u\n",
	389	le32_to_cpup(ptr));
	390	else
	391	return snprintf(buf, PAGE_SIZE, "%u\n",
	392	((unsigned int ) ptr));
46f870d6 TT	393	case attr_pointer_ul:
	394	if (!ptr)
	395	return 0;
	396	return snprintf(buf, PAGE_SIZE, "%lu\n",
	397	((unsigned long ) ptr));
4549b49f TT	398	case attr_pointer_u8:
	399	if (!ptr)
	400	return 0;
	401	return snprintf(buf, PAGE_SIZE, "%u\n",
	402	((unsigned char ) ptr));
	403	case attr_pointer_u64:
	404	if (!ptr)
	405	return 0;
	406	if (a->attr_ptr == ptr_ext4_super_block_offset)
	407	return snprintf(buf, PAGE_SIZE, "%llu\n",
	408	le64_to_cpup(ptr));
	409	else
	410	return snprintf(buf, PAGE_SIZE, "%llu\n",
	411	((unsigned long long ) ptr));
	412	case attr_pointer_string:
	413	if (!ptr)
	414	return 0;
	415	return snprintf(buf, PAGE_SIZE, "%.*s\n", a->attr_size,
	416	(char *) ptr);
76d33bca TT	417	case attr_pointer_atomic:
	418	if (!ptr)
	419	return 0;
	420	return snprintf(buf, PAGE_SIZE, "%d\n",
	421	atomic_read((atomic_t *) ptr));
	422	case attr_feature:
	423	return snprintf(buf, PAGE_SIZE, "supported\n");
6a0678a7 AB	424	case attr_first_error_time:
	425	return print_tstamp(buf, sbi->s_es, s_first_error_time);
	426	case attr_last_error_time:
	427	return print_tstamp(buf, sbi->s_es, s_last_error_time);
bc1d69d6 KK	428	case attr_journal_task:
bc1d69d6 KK	429	return journal_task_show(sbi, buf);
76d33bca TT	430	}
	431
	432	return 0;
b5799018 TT	433	}
	434
	435	static ssize_t ext4_attr_store(struct kobject *kobj,
	436	struct attribute *attr,
	437	const char *buf, size_t len)
	438	{
	439	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
	440	s_kobj);
	441	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
76d33bca TT	442	void *ptr = calc_ptr(a, sbi);
	443	unsigned long t;
	444	int ret;
b5799018	445
76d33bca TT	446	switch (a->attr_id) {
76d33bca TT	447	case attr_reserved_clusters:
6ca06829	448	return reserved_clusters_store(sbi, buf, len);
76d33bca TT	449	case attr_pointer_ui:
	450	if (!ptr)
	451	return 0;
	452	ret = kstrtoul(skip_spaces(buf), 0, &t);
	453	if (ret)
	454	return ret;
a4d2aadc AB	455	if (a->attr_ptr == ptr_ext4_super_block_offset)
	456	((__le32 ) ptr) = cpu_to_le32(t);
	457	else
	458	((unsigned int ) ptr) = t;
76d33bca	459	return len;
46f870d6 TT	460	case attr_pointer_ul:
	461	if (!ptr)
	462	return 0;
	463	ret = kstrtoul(skip_spaces(buf), 0, &t);
	464	if (ret)
	465	return ret;
	466	((unsigned long ) ptr) = t;
	467	return len;
76d33bca	468	case attr_inode_readahead:
6ca06829	469	return inode_readahead_blks_store(sbi, buf, len);
76d33bca	470	case attr_trigger_test_error:
6ca06829	471	return trigger_test_error(sbi, buf, len);
76d33bca TT	472	}
76d33bca TT	473	return 0;
b5799018 TT	474	}
	475
	476	static void ext4_sb_release(struct kobject *kobj)
	477	{
	478	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
	479	s_kobj);
	480	complete(&sbi->s_kobj_unregister);
	481	}
	482
	483	static const struct sysfs_ops ext4_attr_ops = {
	484	.show = ext4_attr_show,
	485	.store = ext4_attr_store,
	486	};
	487
	488	static struct kobj_type ext4_sb_ktype = {
78e9605d	489	.default_groups = ext4_groups,
b5799018 TT	490	.sysfs_ops = &ext4_attr_ops,
	491	.release = ext4_sb_release,
	492	};
	493
b5799018	494	static struct kobj_type ext4_feat_ktype = {
78e9605d	495	.default_groups = ext4_feat_groups,
76d33bca	496	.sysfs_ops = &ext4_attr_ops,
b99fee58	497	.release = (void ()(struct kobject ))kfree,
b5799018 TT	498	};
b5799018 TT	499
bc1420ae TN	500	static struct kobject *ext4_root;
bc1420ae TN	501
b99fee58	502	static struct kobject *ext4_feat;
b5799018 TT	503
	504	int ext4_register_sysfs(struct super_block *sb)
	505	{
	506	struct ext4_sb_info *sbi = EXT4_SB(sb);
ebd173be	507	int err;
b5799018	508
b5799018	509	init_completion(&sbi->s_kobj_unregister);
bc1420ae	510	err = kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, ext4_root,
ebd173be	511	"%s", sb->s_id);
95c4df02 RS	512	if (err) {
	513	kobject_put(&sbi->s_kobj);
	514	wait_for_completion(&sbi->s_kobj_unregister);
ebd173be	515	return err;
95c4df02	516	}
ebd173be TT	517
	518	if (ext4_proc_root)
	519	sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
ebd173be	520	if (sbi->s_proc) {
247dbed8 CH	521	proc_create_single_data("options", S_IRUGO, sbi->s_proc,
	522	ext4_seq_options_show, sb);
	523	proc_create_single_data("es_shrinker_info", S_IRUGO,
	524	sbi->s_proc, ext4_seq_es_shrinker_info_show,
	525	sb);
ce8c59d1 HS	526	proc_create_single_data("fc_info", 0444, sbi->s_proc,
ce8c59d1 HS	527	ext4_fc_info_show, sb);
247dbed8 CH	528	proc_create_seq_data("mb_groups", S_IRUGO, sbi->s_proc,
247dbed8 CH	529	&ext4_mb_seq_groups_ops, sb);
ebd173be TT	530	}
	531	return 0;
	532	}
	533
	534	void ext4_unregister_sysfs(struct super_block *sb)
	535	{
	536	struct ext4_sb_info *sbi = EXT4_SB(sb);
ebd173be	537
247dbed8 CH	538	if (sbi->s_proc)
247dbed8 CH	539	remove_proc_subtree(sb->s_id, ext4_proc_root);
ebd173be	540	kobject_del(&sbi->s_kobj);
b5799018 TT	541	}
	542
	543	int __init ext4_init_sysfs(void)
	544	{
	545	int ret;
	546
bc1420ae TN	547	ext4_root = kobject_create_and_add("ext4", fs_kobj);
bc1420ae TN	548	if (!ext4_root)
5dc39711 RS	549	return -ENOMEM;
5dc39711 RS	550
b99fee58 RS	551	ext4_feat = kzalloc(sizeof(*ext4_feat), GFP_KERNEL);
	552	if (!ext4_feat) {
	553	ret = -ENOMEM;
bc1420ae	554	goto root_err;
95c4df02	555	}
b99fee58	556
b99fee58	557	ret = kobject_init_and_add(ext4_feat, &ext4_feat_ktype,
bc1420ae	558	ext4_root, "features");
b99fee58 RS	559	if (ret)
	560	goto feat_err;
	561
	562	ext4_proc_root = proc_mkdir(proc_dirname, NULL);
	563	return ret;
	564
	565	feat_err:
	566	kobject_put(ext4_feat);
c2e5df76	567	ext4_feat = NULL;
bc1420ae TN	568	root_err:
	569	kobject_put(ext4_root);
	570	ext4_root = NULL;
b5799018 TT	571	return ret;
	572	}
	573
	574	void ext4_exit_sysfs(void)
	575	{
b99fee58	576	kobject_put(ext4_feat);
c2e5df76	577	ext4_feat = NULL;
bc1420ae TN	578	kobject_put(ext4_root);
bc1420ae TN	579	ext4_root = NULL;
ebd173be TT	580	remove_proc_entry(proc_dirname, NULL);
ebd173be TT	581	ext4_proc_root = NULL;
b5799018 TT	582	}
b5799018 TT	583