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

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

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

#include "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_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[1]) -
			 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[1]) -
			  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_RO_ATTR_ES_UI(first_error_time, s_first_error_time);
EXT4_RO_ATTR_ES_UI(last_error_time, s_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 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;
		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");
	}

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