[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_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;
	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_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);
EXT4_ATTR(journal_task, 0444, journal_task);

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

static struct attribute *ext4_attrs[] = {
	ATTR_LIST(delayed_allocation_blocks),
	ATTR_LIST(session_write_kbytes),
	ATTR_LIST(lifetime_write_kbytes),
	ATTR_LIST(reserved_clusters),
	ATTR_LIST(inode_readahead_blks),
	ATTR_LIST(inode_goal),
	ATTR_LIST(mb_stats),
	ATTR_LIST(mb_max_to_scan),
	ATTR_LIST(mb_min_to_scan),
	ATTR_LIST(mb_order2_req),
	ATTR_LIST(mb_stream_req),
	ATTR_LIST(mb_group_prealloc),
	ATTR_LIST(max_writeback_mb_bump),
	ATTR_LIST(extent_max_zeroout_kb),
	ATTR_LIST(trigger_fs_error),
	ATTR_LIST(err_ratelimit_interval_ms),
	ATTR_LIST(err_ratelimit_burst),
	ATTR_LIST(warning_ratelimit_interval_ms),
	ATTR_LIST(warning_ratelimit_burst),
	ATTR_LIST(msg_ratelimit_interval_ms),
	ATTR_LIST(msg_ratelimit_burst),
	ATTR_LIST(errors_count),
	ATTR_LIST(first_error_time),
	ATTR_LIST(last_error_time),
	ATTR_LIST(journal_task),
	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_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_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);
	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_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,
bc1d69d6	33	attr_journal_task,
76d33bca TT	34	} attr_id_t;
	35
	36	typedef enum {
	37	ptr_explicit,
	38	ptr_ext4_sb_info_offset,
	39	ptr_ext4_super_block_offset,
	40	} attr_ptr_t;
	41
d6006186	42	static const char proc_dirname[] = "fs/ext4";
ebd173be TT	43	static struct proc_dir_entry *ext4_proc_root;
ebd173be TT	44
b5799018 TT	45	struct ext4_attr {
b5799018 TT	46	struct attribute attr;
76d33bca TT	47	short attr_id;
76d33bca TT	48	short attr_ptr;
b5799018 TT	49	union {
b5799018 TT	50	int offset;
76d33bca	51	void *explicit_ptr;
b5799018 TT	52	} u;
	53	};
	54
6ca06829	55	static ssize_t session_write_kbytes_show(struct ext4_sb_info sbi, char buf)
b5799018 TT	56	{
	57	struct super_block *sb = sbi->s_buddy_cache->i_sb;
	58
	59	if (!sb->s_bdev->bd_part)
	60	return snprintf(buf, PAGE_SIZE, "0\n");
	61	return snprintf(buf, PAGE_SIZE, "%lu\n",
dbae2c55 MC	62	(part_stat_read(sb->s_bdev->bd_part,
dbae2c55 MC	63	sectors[STAT_WRITE]) -
b5799018 TT	64	sbi->s_sectors_written_start) >> 1);
	65	}
	66
6ca06829	67	static ssize_t lifetime_write_kbytes_show(struct ext4_sb_info sbi, char buf)
b5799018 TT	68	{
	69	struct super_block *sb = sbi->s_buddy_cache->i_sb;
	70
	71	if (!sb->s_bdev->bd_part)
	72	return snprintf(buf, PAGE_SIZE, "0\n");
	73	return snprintf(buf, PAGE_SIZE, "%llu\n",
	74	(unsigned long long)(sbi->s_kbytes_written +
dbae2c55 MC	75	((part_stat_read(sb->s_bdev->bd_part,
dbae2c55 MC	76	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
76d33bca TT	157	#define EXT4_RO_ATTR_ES_UI(_name,_elname) \
76d33bca TT	158	EXT4_ATTR_OFFSET(_name, 0444, pointer_ui, ext4_super_block, _elname)
b5799018	159
76d33bca TT	160	#define EXT4_RW_ATTR_SBI_UI(_name,_elname) \
76d33bca TT	161	EXT4_ATTR_OFFSET(_name, 0644, pointer_ui, ext4_sb_info, _elname)
b5799018	162
76d33bca	163	#define EXT4_ATTR_PTR(_name,_mode,_id,_ptr) \
b5799018	164	static struct ext4_attr ext4_attr_##_name = { \
76d33bca TT	165	.attr = {.name = __stringify(_name), .mode = _mode }, \
	166	.attr_id = attr_##_id, \
	167	.attr_ptr = ptr_explicit, \
b5799018	168	.u = { \
76d33bca	169	.explicit_ptr = _ptr, \
b5799018 TT	170	}, \
	171	}
	172
76d33bca TT	173	#define ATTR_LIST(name) &ext4_attr_##name.attr
	174
	175	EXT4_ATTR_FUNC(delayed_allocation_blocks, 0444);
	176	EXT4_ATTR_FUNC(session_write_kbytes, 0444);
	177	EXT4_ATTR_FUNC(lifetime_write_kbytes, 0444);
	178	EXT4_ATTR_FUNC(reserved_clusters, 0644);
	179
	180	EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, inode_readahead,
	181	ext4_sb_info, s_inode_readahead_blks);
b5799018 TT	182	EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
	183	EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
	184	EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
	185	EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
	186	EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
	187	EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
	188	EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
b5799018	189	EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
76d33bca	190	EXT4_ATTR(trigger_fs_error, 0200, trigger_test_error);
b5799018 TT	191	EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
	192	EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
	193	EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
	194	EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
	195	EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
	196	EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
	197	EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
6a0678a7 AB	198	EXT4_ATTR(first_error_time, 0444, first_error_time);
6a0678a7 AB	199	EXT4_ATTR(last_error_time, 0444, last_error_time);
bc1d69d6	200	EXT4_ATTR(journal_task, 0444, journal_task);
b5799018	201
76d33bca TT	202	static unsigned int old_bump_val = 128;
	203	EXT4_ATTR_PTR(max_writeback_mb_bump, 0444, pointer_ui, &old_bump_val);
	204
b5799018 TT	205	static struct attribute *ext4_attrs[] = {
	206	ATTR_LIST(delayed_allocation_blocks),
	207	ATTR_LIST(session_write_kbytes),
	208	ATTR_LIST(lifetime_write_kbytes),
	209	ATTR_LIST(reserved_clusters),
	210	ATTR_LIST(inode_readahead_blks),
	211	ATTR_LIST(inode_goal),
	212	ATTR_LIST(mb_stats),
	213	ATTR_LIST(mb_max_to_scan),
	214	ATTR_LIST(mb_min_to_scan),
	215	ATTR_LIST(mb_order2_req),
	216	ATTR_LIST(mb_stream_req),
	217	ATTR_LIST(mb_group_prealloc),
	218	ATTR_LIST(max_writeback_mb_bump),
	219	ATTR_LIST(extent_max_zeroout_kb),
	220	ATTR_LIST(trigger_fs_error),
	221	ATTR_LIST(err_ratelimit_interval_ms),
	222	ATTR_LIST(err_ratelimit_burst),
	223	ATTR_LIST(warning_ratelimit_interval_ms),
	224	ATTR_LIST(warning_ratelimit_burst),
	225	ATTR_LIST(msg_ratelimit_interval_ms),
	226	ATTR_LIST(msg_ratelimit_burst),
	227	ATTR_LIST(errors_count),
	228	ATTR_LIST(first_error_time),
	229	ATTR_LIST(last_error_time),
bc1d69d6	230	ATTR_LIST(journal_task),
b5799018 TT	231	NULL,
	232	};
	233
	234	/* Features this copy of ext4 supports */
76d33bca TT	235	EXT4_ATTR_FEATURE(lazy_itable_init);
	236	EXT4_ATTR_FEATURE(batched_discard);
	237	EXT4_ATTR_FEATURE(meta_bg_resize);
643fa961	238	#ifdef CONFIG_FS_ENCRYPTION
76d33bca	239	EXT4_ATTR_FEATURE(encryption);
c4704a4f	240	#endif
8c81bd8f	241	EXT4_ATTR_FEATURE(metadata_csum_seed);
b5799018 TT	242
	243	static struct attribute *ext4_feat_attrs[] = {
	244	ATTR_LIST(lazy_itable_init),
	245	ATTR_LIST(batched_discard),
	246	ATTR_LIST(meta_bg_resize),
643fa961	247	#ifdef CONFIG_FS_ENCRYPTION
b5799018	248	ATTR_LIST(encryption),
c4704a4f	249	#endif
8c81bd8f	250	ATTR_LIST(metadata_csum_seed),
b5799018 TT	251	NULL,
	252	};
	253
76d33bca TT	254	static void calc_ptr(struct ext4_attr a, struct ext4_sb_info *sbi)
	255	{
	256	switch (a->attr_ptr) {
	257	case ptr_explicit:
	258	return a->u.explicit_ptr;
	259	case ptr_ext4_sb_info_offset:
	260	return (void ) (((char ) sbi) + a->u.offset);
	261	case ptr_ext4_super_block_offset:
	262	return (void ) (((char ) sbi->s_es) + a->u.offset);
	263	}
	264	return NULL;
	265	}
	266
6a0678a7 AB	267	static ssize_t __print_tstamp(char *buf, __le32 lo, __u8 hi)
	268	{
	269	return snprintf(buf, PAGE_SIZE, "%lld",
	270	((time64_t)hi << 32) + le32_to_cpu(lo));
	271	}
	272
	273	#define print_tstamp(buf, es, tstamp) \
	274	__print_tstamp(buf, (es)->tstamp, (es)->tstamp ## _hi)
	275
b5799018 TT	276	static ssize_t ext4_attr_show(struct kobject *kobj,
	277	struct attribute attr, char buf)
	278	{
	279	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
	280	s_kobj);
	281	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
76d33bca TT	282	void *ptr = calc_ptr(a, sbi);
	283
	284	switch (a->attr_id) {
	285	case attr_delayed_allocation_blocks:
	286	return snprintf(buf, PAGE_SIZE, "%llu\n",
	287	(s64) EXT4_C2B(sbi,
	288	percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
	289	case attr_session_write_kbytes:
6ca06829	290	return session_write_kbytes_show(sbi, buf);
76d33bca	291	case attr_lifetime_write_kbytes:
6ca06829	292	return lifetime_write_kbytes_show(sbi, buf);
76d33bca TT	293	case attr_reserved_clusters:
	294	return snprintf(buf, PAGE_SIZE, "%llu\n",
	295	(unsigned long long)
	296	atomic64_read(&sbi->s_resv_clusters));
	297	case attr_inode_readahead:
	298	case attr_pointer_ui:
	299	if (!ptr)
	300	return 0;
a4d2aadc AB	301	if (a->attr_ptr == ptr_ext4_super_block_offset)
	302	return snprintf(buf, PAGE_SIZE, "%u\n",
	303	le32_to_cpup(ptr));
	304	else
	305	return snprintf(buf, PAGE_SIZE, "%u\n",
	306	((unsigned int ) ptr));
76d33bca TT	307	case attr_pointer_atomic:
	308	if (!ptr)
	309	return 0;
	310	return snprintf(buf, PAGE_SIZE, "%d\n",
	311	atomic_read((atomic_t *) ptr));
	312	case attr_feature:
	313	return snprintf(buf, PAGE_SIZE, "supported\n");
6a0678a7 AB	314	case attr_first_error_time:
	315	return print_tstamp(buf, sbi->s_es, s_first_error_time);
	316	case attr_last_error_time:
	317	return print_tstamp(buf, sbi->s_es, s_last_error_time);
bc1d69d6 KK	318	case attr_journal_task:
bc1d69d6 KK	319	return journal_task_show(sbi, buf);
76d33bca TT	320	}
	321
	322	return 0;
b5799018 TT	323	}
	324
	325	static ssize_t ext4_attr_store(struct kobject *kobj,
	326	struct attribute *attr,
	327	const char *buf, size_t len)
	328	{
	329	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
	330	s_kobj);
	331	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
76d33bca TT	332	void *ptr = calc_ptr(a, sbi);
	333	unsigned long t;
	334	int ret;
b5799018	335
76d33bca TT	336	switch (a->attr_id) {
76d33bca TT	337	case attr_reserved_clusters:
6ca06829	338	return reserved_clusters_store(sbi, buf, len);
76d33bca TT	339	case attr_pointer_ui:
	340	if (!ptr)
	341	return 0;
	342	ret = kstrtoul(skip_spaces(buf), 0, &t);
	343	if (ret)
	344	return ret;
a4d2aadc AB	345	if (a->attr_ptr == ptr_ext4_super_block_offset)
	346	((__le32 ) ptr) = cpu_to_le32(t);
	347	else
	348	((unsigned int ) ptr) = t;
76d33bca TT	349	return len;
76d33bca TT	350	case attr_inode_readahead:
6ca06829	351	return inode_readahead_blks_store(sbi, buf, len);
76d33bca	352	case attr_trigger_test_error:
6ca06829	353	return trigger_test_error(sbi, buf, len);
76d33bca TT	354	}
76d33bca TT	355	return 0;
b5799018 TT	356	}
	357
	358	static void ext4_sb_release(struct kobject *kobj)
	359	{
	360	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
	361	s_kobj);
	362	complete(&sbi->s_kobj_unregister);
	363	}
	364
	365	static const struct sysfs_ops ext4_attr_ops = {
	366	.show = ext4_attr_show,
	367	.store = ext4_attr_store,
	368	};
	369
	370	static struct kobj_type ext4_sb_ktype = {
	371	.default_attrs = ext4_attrs,
	372	.sysfs_ops = &ext4_attr_ops,
	373	.release = ext4_sb_release,
	374	};
	375
b5799018 TT	376	static struct kobj_type ext4_feat_ktype = {
b5799018 TT	377	.default_attrs = ext4_feat_attrs,
76d33bca	378	.sysfs_ops = &ext4_attr_ops,
b99fee58	379	.release = (void ()(struct kobject ))kfree,
b5799018 TT	380	};
b5799018 TT	381
bc1420ae TN	382	static struct kobject *ext4_root;
bc1420ae TN	383
b99fee58	384	static struct kobject *ext4_feat;
b5799018 TT	385
	386	int ext4_register_sysfs(struct super_block *sb)
	387	{
	388	struct ext4_sb_info *sbi = EXT4_SB(sb);
ebd173be	389	int err;
b5799018	390
b5799018	391	init_completion(&sbi->s_kobj_unregister);
bc1420ae	392	err = kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, ext4_root,
ebd173be	393	"%s", sb->s_id);
95c4df02 RS	394	if (err) {
	395	kobject_put(&sbi->s_kobj);
	396	wait_for_completion(&sbi->s_kobj_unregister);
ebd173be	397	return err;
95c4df02	398	}
ebd173be TT	399
	400	if (ext4_proc_root)
	401	sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
ebd173be	402	if (sbi->s_proc) {
247dbed8 CH	403	proc_create_single_data("options", S_IRUGO, sbi->s_proc,
	404	ext4_seq_options_show, sb);
	405	proc_create_single_data("es_shrinker_info", S_IRUGO,
	406	sbi->s_proc, ext4_seq_es_shrinker_info_show,
	407	sb);
	408	proc_create_seq_data("mb_groups", S_IRUGO, sbi->s_proc,
	409	&ext4_mb_seq_groups_ops, sb);
ebd173be TT	410	}
	411	return 0;
	412	}
	413
	414	void ext4_unregister_sysfs(struct super_block *sb)
	415	{
	416	struct ext4_sb_info *sbi = EXT4_SB(sb);
ebd173be	417
247dbed8 CH	418	if (sbi->s_proc)
247dbed8 CH	419	remove_proc_subtree(sb->s_id, ext4_proc_root);
ebd173be	420	kobject_del(&sbi->s_kobj);
b5799018 TT	421	}
	422
	423	int __init ext4_init_sysfs(void)
	424	{
	425	int ret;
	426
bc1420ae TN	427	ext4_root = kobject_create_and_add("ext4", fs_kobj);
bc1420ae TN	428	if (!ext4_root)
5dc39711 RS	429	return -ENOMEM;
5dc39711 RS	430
b99fee58 RS	431	ext4_feat = kzalloc(sizeof(*ext4_feat), GFP_KERNEL);
	432	if (!ext4_feat) {
	433	ret = -ENOMEM;
bc1420ae	434	goto root_err;
95c4df02	435	}
b99fee58	436
b99fee58	437	ret = kobject_init_and_add(ext4_feat, &ext4_feat_ktype,
bc1420ae	438	ext4_root, "features");
b99fee58 RS	439	if (ret)
	440	goto feat_err;
	441
	442	ext4_proc_root = proc_mkdir(proc_dirname, NULL);
	443	return ret;
	444
	445	feat_err:
	446	kobject_put(ext4_feat);
c2e5df76	447	ext4_feat = NULL;
bc1420ae TN	448	root_err:
	449	kobject_put(ext4_root);
	450	ext4_root = NULL;
b5799018 TT	451	return ret;
	452	}
	453
	454	void ext4_exit_sysfs(void)
	455	{
b99fee58	456	kobject_put(ext4_feat);
c2e5df76	457	ext4_feat = NULL;
bc1420ae TN	458	kobject_put(ext4_root);
bc1420ae TN	459	ext4_root = NULL;
ebd173be TT	460	remove_proc_entry(proc_dirname, NULL);
ebd173be TT	461	ext4_proc_root = NULL;
b5799018 TT	462	}
b5799018 TT	463