[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 "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_atomic,
} 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;
	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;
}

#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_RO_ATTR_ES_UI(_name,_elname)				\
	EXT4_ATTR_OFFSET(_name, 0444, pointer_ui, 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_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);
EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
EXT4_ATTR(first_error_time, 0444, first_error_time);
EXT4_ATTR(last_error_time, 0444, last_error_time);

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_time),
	ATTR_LIST(last_error_time),
	NULL,
};

/* 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_EXT4_FS_ENCRYPTION
EXT4_ATTR_FEATURE(encryption);
#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_EXT4_FS_ENCRYPTION
	ATTR_LIST(encryption),
#endif
	ATTR_LIST(metadata_csum_seed),
	NULL,
};

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",
			((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_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);
	}

	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_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_attrs	= ext4_attrs,
	.sysfs_ops	= &ext4_attr_ops,
	.release	= ext4_sb_release,
};

static struct kobj_type ext4_feat_ktype = {
	.default_attrs	= ext4_feat_attrs,
	.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 ([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 TT	15	#include <linux/proc_fs.h>
	16
	17	#include "ext4.h"
	18	#include "ext4_jbd2.h"
	19
76d33bca TT	20	typedef enum {
	21	attr_noop,
	22	attr_delayed_allocation_blocks,
	23	attr_session_write_kbytes,
	24	attr_lifetime_write_kbytes,
	25	attr_reserved_clusters,
	26	attr_inode_readahead,
	27	attr_trigger_test_error,
6a0678a7 AB	28	attr_first_error_time,
6a0678a7 AB	29	attr_last_error_time,
76d33bca TT	30	attr_feature,
	31	attr_pointer_ui,
	32	attr_pointer_atomic,
	33	} attr_id_t;
	34
	35	typedef enum {
	36	ptr_explicit,
	37	ptr_ext4_sb_info_offset,
	38	ptr_ext4_super_block_offset,
	39	} attr_ptr_t;
	40
d6006186	41	static const char proc_dirname[] = "fs/ext4";
ebd173be TT	42	static struct proc_dir_entry *ext4_proc_root;
ebd173be TT	43
b5799018 TT	44	struct ext4_attr {
b5799018 TT	45	struct attribute attr;
76d33bca TT	46	short attr_id;
76d33bca TT	47	short attr_ptr;
b5799018 TT	48	union {
b5799018 TT	49	int offset;
76d33bca	50	void *explicit_ptr;
b5799018 TT	51	} u;
	52	};
	53
6ca06829	54	static ssize_t session_write_kbytes_show(struct ext4_sb_info sbi, char buf)
b5799018 TT	55	{
	56	struct super_block *sb = sbi->s_buddy_cache->i_sb;
	57
	58	if (!sb->s_bdev->bd_part)
	59	return snprintf(buf, PAGE_SIZE, "0\n");
	60	return snprintf(buf, PAGE_SIZE, "%lu\n",
dbae2c55 MC	61	(part_stat_read(sb->s_bdev->bd_part,
dbae2c55 MC	62	sectors[STAT_WRITE]) -
b5799018 TT	63	sbi->s_sectors_written_start) >> 1);
	64	}
	65
6ca06829	66	static ssize_t lifetime_write_kbytes_show(struct ext4_sb_info sbi, char buf)
b5799018 TT	67	{
	68	struct super_block *sb = sbi->s_buddy_cache->i_sb;
	69
	70	if (!sb->s_bdev->bd_part)
	71	return snprintf(buf, PAGE_SIZE, "0\n");
	72	return snprintf(buf, PAGE_SIZE, "%llu\n",
	73	(unsigned long long)(sbi->s_kbytes_written +
dbae2c55 MC	74	((part_stat_read(sb->s_bdev->bd_part,
dbae2c55 MC	75	sectors[STAT_WRITE]) -
b5799018 TT	76	EXT4_SB(sb)->s_sectors_written_start) >> 1)));
	77	}
	78
6ca06829	79	static ssize_t inode_readahead_blks_store(struct ext4_sb_info *sbi,
b5799018 TT	80	const char *buf, size_t count)
	81	{
	82	unsigned long t;
	83	int ret;
	84
	85	ret = kstrtoul(skip_spaces(buf), 0, &t);
	86	if (ret)
	87	return ret;
	88
	89	if (t && (!is_power_of_2(t) \|\| t > 0x40000000))
	90	return -EINVAL;
	91
	92	sbi->s_inode_readahead_blks = t;
	93	return count;
	94	}
	95
6ca06829	96	static ssize_t reserved_clusters_store(struct ext4_sb_info *sbi,
b5799018 TT	97	const char *buf, size_t count)
	98	{
	99	unsigned long long val;
	100	ext4_fsblk_t clusters = (ext4_blocks_count(sbi->s_es) >>
	101	sbi->s_cluster_bits);
76d33bca	102	int ret;
b5799018	103
76d33bca	104	ret = kstrtoull(skip_spaces(buf), 0, &val);
1ea1516f	105	if (ret \|\| val >= clusters)
b5799018 TT	106	return -EINVAL;
	107
	108	atomic64_set(&sbi->s_resv_clusters, val);
	109	return count;
	110	}
	111
6ca06829	112	static ssize_t trigger_test_error(struct ext4_sb_info *sbi,
b5799018 TT	113	const char *buf, size_t count)
	114	{
	115	int len = count;
	116
	117	if (!capable(CAP_SYS_ADMIN))
	118	return -EPERM;
	119
	120	if (len && buf[len-1] == '\n')
	121	len--;
	122
	123	if (len)
	124	ext4_error(sbi->s_sb, "%.*s", len, buf);
	125	return count;
	126	}
	127
76d33bca TT	128	#define EXT4_ATTR(_name,_mode,_id) \
	129	static struct ext4_attr ext4_attr_##_name = { \
	130	.attr = {.name = __stringify(_name), .mode = _mode }, \
	131	.attr_id = attr_##_id, \
b5799018 TT	132	}
b5799018 TT	133
76d33bca TT	134	#define EXT4_ATTR_FUNC(_name,_mode) EXT4_ATTR(_name,_mode,_name)
	135
	136	#define EXT4_ATTR_FEATURE(_name) EXT4_ATTR(_name, 0444, feature)
	137
	138	#define EXT4_ATTR_OFFSET(_name,_mode,_id,_struct,_elname) \
b5799018 TT	139	static struct ext4_attr ext4_attr_##_name = { \
b5799018 TT	140	.attr = {.name = __stringify(_name), .mode = _mode }, \
76d33bca TT	141	.attr_id = attr_##_id, \
76d33bca TT	142	.attr_ptr = ptr_##_struct##_offset, \
b5799018	143	.u = { \
76d33bca	144	.offset = offsetof(struct _struct, _elname),\
b5799018 TT	145	}, \
	146	}
	147
76d33bca TT	148	#define EXT4_RO_ATTR_ES_UI(_name,_elname) \
76d33bca TT	149	EXT4_ATTR_OFFSET(_name, 0444, pointer_ui, ext4_super_block, _elname)
b5799018	150
76d33bca TT	151	#define EXT4_RW_ATTR_SBI_UI(_name,_elname) \
76d33bca TT	152	EXT4_ATTR_OFFSET(_name, 0644, pointer_ui, ext4_sb_info, _elname)
b5799018	153
76d33bca	154	#define EXT4_ATTR_PTR(_name,_mode,_id,_ptr) \
b5799018	155	static struct ext4_attr ext4_attr_##_name = { \
76d33bca TT	156	.attr = {.name = __stringify(_name), .mode = _mode }, \
	157	.attr_id = attr_##_id, \
	158	.attr_ptr = ptr_explicit, \
b5799018	159	.u = { \
76d33bca	160	.explicit_ptr = _ptr, \
b5799018 TT	161	}, \
	162	}
	163
76d33bca TT	164	#define ATTR_LIST(name) &ext4_attr_##name.attr
	165
	166	EXT4_ATTR_FUNC(delayed_allocation_blocks, 0444);
	167	EXT4_ATTR_FUNC(session_write_kbytes, 0444);
	168	EXT4_ATTR_FUNC(lifetime_write_kbytes, 0444);
	169	EXT4_ATTR_FUNC(reserved_clusters, 0644);
	170
	171	EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, inode_readahead,
	172	ext4_sb_info, s_inode_readahead_blks);
b5799018 TT	173	EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
	174	EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
	175	EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
	176	EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
	177	EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
	178	EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
	179	EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
b5799018	180	EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
76d33bca	181	EXT4_ATTR(trigger_fs_error, 0200, trigger_test_error);
b5799018 TT	182	EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
	183	EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
	184	EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
	185	EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
	186	EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
	187	EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
	188	EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
6a0678a7 AB	189	EXT4_ATTR(first_error_time, 0444, first_error_time);
6a0678a7 AB	190	EXT4_ATTR(last_error_time, 0444, last_error_time);
b5799018	191
76d33bca TT	192	static unsigned int old_bump_val = 128;
	193	EXT4_ATTR_PTR(max_writeback_mb_bump, 0444, pointer_ui, &old_bump_val);
	194
b5799018 TT	195	static struct attribute *ext4_attrs[] = {
	196	ATTR_LIST(delayed_allocation_blocks),
	197	ATTR_LIST(session_write_kbytes),
	198	ATTR_LIST(lifetime_write_kbytes),
	199	ATTR_LIST(reserved_clusters),
	200	ATTR_LIST(inode_readahead_blks),
	201	ATTR_LIST(inode_goal),
	202	ATTR_LIST(mb_stats),
	203	ATTR_LIST(mb_max_to_scan),
	204	ATTR_LIST(mb_min_to_scan),
	205	ATTR_LIST(mb_order2_req),
	206	ATTR_LIST(mb_stream_req),
	207	ATTR_LIST(mb_group_prealloc),
	208	ATTR_LIST(max_writeback_mb_bump),
	209	ATTR_LIST(extent_max_zeroout_kb),
	210	ATTR_LIST(trigger_fs_error),
	211	ATTR_LIST(err_ratelimit_interval_ms),
	212	ATTR_LIST(err_ratelimit_burst),
	213	ATTR_LIST(warning_ratelimit_interval_ms),
	214	ATTR_LIST(warning_ratelimit_burst),
	215	ATTR_LIST(msg_ratelimit_interval_ms),
	216	ATTR_LIST(msg_ratelimit_burst),
	217	ATTR_LIST(errors_count),
	218	ATTR_LIST(first_error_time),
	219	ATTR_LIST(last_error_time),
	220	NULL,
	221	};
	222
	223	/* Features this copy of ext4 supports */
76d33bca TT	224	EXT4_ATTR_FEATURE(lazy_itable_init);
	225	EXT4_ATTR_FEATURE(batched_discard);
	226	EXT4_ATTR_FEATURE(meta_bg_resize);
c4704a4f	227	#ifdef CONFIG_EXT4_FS_ENCRYPTION
76d33bca	228	EXT4_ATTR_FEATURE(encryption);
c4704a4f	229	#endif
8c81bd8f	230	EXT4_ATTR_FEATURE(metadata_csum_seed);
b5799018 TT	231
	232	static struct attribute *ext4_feat_attrs[] = {
	233	ATTR_LIST(lazy_itable_init),
	234	ATTR_LIST(batched_discard),
	235	ATTR_LIST(meta_bg_resize),
c4704a4f	236	#ifdef CONFIG_EXT4_FS_ENCRYPTION
b5799018	237	ATTR_LIST(encryption),
c4704a4f	238	#endif
8c81bd8f	239	ATTR_LIST(metadata_csum_seed),
b5799018 TT	240	NULL,
	241	};
	242
76d33bca TT	243	static void calc_ptr(struct ext4_attr a, struct ext4_sb_info *sbi)
	244	{
	245	switch (a->attr_ptr) {
	246	case ptr_explicit:
	247	return a->u.explicit_ptr;
	248	case ptr_ext4_sb_info_offset:
	249	return (void ) (((char ) sbi) + a->u.offset);
	250	case ptr_ext4_super_block_offset:
	251	return (void ) (((char ) sbi->s_es) + a->u.offset);
	252	}
	253	return NULL;
	254	}
	255
6a0678a7 AB	256	static ssize_t __print_tstamp(char *buf, __le32 lo, __u8 hi)
	257	{
	258	return snprintf(buf, PAGE_SIZE, "%lld",
	259	((time64_t)hi << 32) + le32_to_cpu(lo));
	260	}
	261
	262	#define print_tstamp(buf, es, tstamp) \
	263	__print_tstamp(buf, (es)->tstamp, (es)->tstamp ## _hi)
	264
b5799018 TT	265	static ssize_t ext4_attr_show(struct kobject *kobj,
	266	struct attribute attr, char buf)
	267	{
	268	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
	269	s_kobj);
	270	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
76d33bca TT	271	void *ptr = calc_ptr(a, sbi);
	272
	273	switch (a->attr_id) {
	274	case attr_delayed_allocation_blocks:
	275	return snprintf(buf, PAGE_SIZE, "%llu\n",
	276	(s64) EXT4_C2B(sbi,
	277	percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
	278	case attr_session_write_kbytes:
6ca06829	279	return session_write_kbytes_show(sbi, buf);
76d33bca	280	case attr_lifetime_write_kbytes:
6ca06829	281	return lifetime_write_kbytes_show(sbi, buf);
76d33bca TT	282	case attr_reserved_clusters:
	283	return snprintf(buf, PAGE_SIZE, "%llu\n",
	284	(unsigned long long)
	285	atomic64_read(&sbi->s_resv_clusters));
	286	case attr_inode_readahead:
	287	case attr_pointer_ui:
	288	if (!ptr)
	289	return 0;
a4d2aadc AB	290	if (a->attr_ptr == ptr_ext4_super_block_offset)
	291	return snprintf(buf, PAGE_SIZE, "%u\n",
	292	le32_to_cpup(ptr));
	293	else
	294	return snprintf(buf, PAGE_SIZE, "%u\n",
	295	((unsigned int ) ptr));
76d33bca TT	296	case attr_pointer_atomic:
	297	if (!ptr)
	298	return 0;
	299	return snprintf(buf, PAGE_SIZE, "%d\n",
	300	atomic_read((atomic_t *) ptr));
	301	case attr_feature:
	302	return snprintf(buf, PAGE_SIZE, "supported\n");
6a0678a7 AB	303	case attr_first_error_time:
	304	return print_tstamp(buf, sbi->s_es, s_first_error_time);
	305	case attr_last_error_time:
	306	return print_tstamp(buf, sbi->s_es, s_last_error_time);
76d33bca TT	307	}
	308
	309	return 0;
b5799018 TT	310	}
	311
	312	static ssize_t ext4_attr_store(struct kobject *kobj,
	313	struct attribute *attr,
	314	const char *buf, size_t len)
	315	{
	316	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
	317	s_kobj);
	318	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
76d33bca TT	319	void *ptr = calc_ptr(a, sbi);
	320	unsigned long t;
	321	int ret;
b5799018	322
76d33bca TT	323	switch (a->attr_id) {
76d33bca TT	324	case attr_reserved_clusters:
6ca06829	325	return reserved_clusters_store(sbi, buf, len);
76d33bca TT	326	case attr_pointer_ui:
	327	if (!ptr)
	328	return 0;
	329	ret = kstrtoul(skip_spaces(buf), 0, &t);
	330	if (ret)
	331	return ret;
a4d2aadc AB	332	if (a->attr_ptr == ptr_ext4_super_block_offset)
	333	((__le32 ) ptr) = cpu_to_le32(t);
	334	else
	335	((unsigned int ) ptr) = t;
76d33bca TT	336	return len;
76d33bca TT	337	case attr_inode_readahead:
6ca06829	338	return inode_readahead_blks_store(sbi, buf, len);
76d33bca	339	case attr_trigger_test_error:
6ca06829	340	return trigger_test_error(sbi, buf, len);
76d33bca TT	341	}
76d33bca TT	342	return 0;
b5799018 TT	343	}
	344
	345	static void ext4_sb_release(struct kobject *kobj)
	346	{
	347	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
	348	s_kobj);
	349	complete(&sbi->s_kobj_unregister);
	350	}
	351
	352	static const struct sysfs_ops ext4_attr_ops = {
	353	.show = ext4_attr_show,
	354	.store = ext4_attr_store,
	355	};
	356
	357	static struct kobj_type ext4_sb_ktype = {
	358	.default_attrs = ext4_attrs,
	359	.sysfs_ops = &ext4_attr_ops,
	360	.release = ext4_sb_release,
	361	};
	362
b5799018 TT	363	static struct kobj_type ext4_feat_ktype = {
b5799018 TT	364	.default_attrs = ext4_feat_attrs,
76d33bca	365	.sysfs_ops = &ext4_attr_ops,
b99fee58	366	.release = (void ()(struct kobject ))kfree,
b5799018 TT	367	};
b5799018 TT	368
bc1420ae TN	369	static struct kobject *ext4_root;
bc1420ae TN	370
b99fee58	371	static struct kobject *ext4_feat;
b5799018 TT	372
	373	int ext4_register_sysfs(struct super_block *sb)
	374	{
	375	struct ext4_sb_info *sbi = EXT4_SB(sb);
ebd173be	376	int err;
b5799018	377
b5799018	378	init_completion(&sbi->s_kobj_unregister);
bc1420ae	379	err = kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, ext4_root,
ebd173be	380	"%s", sb->s_id);
95c4df02 RS	381	if (err) {
	382	kobject_put(&sbi->s_kobj);
	383	wait_for_completion(&sbi->s_kobj_unregister);
ebd173be	384	return err;
95c4df02	385	}
ebd173be TT	386
	387	if (ext4_proc_root)
	388	sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
ebd173be	389	if (sbi->s_proc) {
247dbed8 CH	390	proc_create_single_data("options", S_IRUGO, sbi->s_proc,
	391	ext4_seq_options_show, sb);
	392	proc_create_single_data("es_shrinker_info", S_IRUGO,
	393	sbi->s_proc, ext4_seq_es_shrinker_info_show,
	394	sb);
	395	proc_create_seq_data("mb_groups", S_IRUGO, sbi->s_proc,
	396	&ext4_mb_seq_groups_ops, sb);
ebd173be TT	397	}
	398	return 0;
	399	}
	400
	401	void ext4_unregister_sysfs(struct super_block *sb)
	402	{
	403	struct ext4_sb_info *sbi = EXT4_SB(sb);
ebd173be	404
247dbed8 CH	405	if (sbi->s_proc)
247dbed8 CH	406	remove_proc_subtree(sb->s_id, ext4_proc_root);
ebd173be	407	kobject_del(&sbi->s_kobj);
b5799018 TT	408	}
	409
	410	int __init ext4_init_sysfs(void)
	411	{
	412	int ret;
	413
bc1420ae TN	414	ext4_root = kobject_create_and_add("ext4", fs_kobj);
bc1420ae TN	415	if (!ext4_root)
5dc39711 RS	416	return -ENOMEM;
5dc39711 RS	417
b99fee58 RS	418	ext4_feat = kzalloc(sizeof(*ext4_feat), GFP_KERNEL);
	419	if (!ext4_feat) {
	420	ret = -ENOMEM;
bc1420ae	421	goto root_err;
95c4df02	422	}
b99fee58	423
b99fee58	424	ret = kobject_init_and_add(ext4_feat, &ext4_feat_ktype,
bc1420ae	425	ext4_root, "features");
b99fee58 RS	426	if (ret)
	427	goto feat_err;
	428
	429	ext4_proc_root = proc_mkdir(proc_dirname, NULL);
	430	return ret;
	431
	432	feat_err:
	433	kobject_put(ext4_feat);
c2e5df76	434	ext4_feat = NULL;
bc1420ae TN	435	root_err:
	436	kobject_put(ext4_root);
	437	ext4_root = NULL;
b5799018 TT	438	return ret;
	439	}
	440
	441	void ext4_exit_sysfs(void)
	442	{
b99fee58	443	kobject_put(ext4_feat);
c2e5df76	444	ext4_feat = NULL;
bc1420ae TN	445	kobject_put(ext4_root);
bc1420ae TN	446	ext4_root = NULL;
ebd173be TT	447	remove_proc_entry(proc_dirname, NULL);
ebd173be TT	448	ext4_proc_root = NULL;
b5799018 TT	449	}
b5799018 TT	450