[mirror_ubuntu-bionic-kernel.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/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_attr *a,
					 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_attr *a,
					  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_attr *a,
					  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_attr *a,
				   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_attr *a,
				  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(a, sbi, buf);
	case attr_lifetime_write_kbytes:
		return lifetime_write_kbytes_show(a, 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(a, 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(a, sbi, buf, len);
	case attr_trigger_test_error:
		return trigger_test_error(a, 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_ktype = {
	.sysfs_ops	= &ext4_attr_ops,
};

static struct kset ext4_kset = {
	.kobj   = {.ktype = &ext4_ktype},
};

static struct kobj_type ext4_feat_ktype = {
	.default_attrs	= ext4_feat_attrs,
	.sysfs_ops	= &ext4_attr_ops,
};

static struct kobject ext4_feat = {
	.kset	= &ext4_kset,
};

#define PROC_FILE_SHOW_DEFN(name) \
static int name##_open(struct inode *inode, struct file *file) \
{ \
	return single_open(file, ext4_seq_##name##_show, PDE_DATA(inode)); \
} \
\
static const struct file_operations ext4_seq_##name##_fops = { \
	.open		= name##_open, \
	.read		= seq_read, \
	.llseek		= seq_lseek, \
	.release	= single_release, \
}

#define PROC_FILE_LIST(name) \
	{ __stringify(name), &ext4_seq_##name##_fops }

PROC_FILE_SHOW_DEFN(es_shrinker_info);
PROC_FILE_SHOW_DEFN(options);

static const struct ext4_proc_files {
	const char *name;
	const struct file_operations *fops;
} proc_files[] = {
	PROC_FILE_LIST(options),
	PROC_FILE_LIST(es_shrinker_info),
	PROC_FILE_LIST(mb_groups),
	{ NULL, NULL },
};

int ext4_register_sysfs(struct super_block *sb)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	const struct ext4_proc_files *p;
	int err;

	sbi->s_kobj.kset = &ext4_kset;
	init_completion(&sbi->s_kobj_unregister);
	err = kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, NULL,
				   "%s", sb->s_id);
	if (err)
		return err;

	if (ext4_proc_root)
		sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);

	if (sbi->s_proc) {
		for (p = proc_files; p->name; p++)
			proc_create_data(p->name, S_IRUGO, sbi->s_proc,
					 p->fops, sb);
	}
	return 0;
}

void ext4_unregister_sysfs(struct super_block *sb)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	const struct ext4_proc_files *p;

	if (sbi->s_proc) {
		for (p = proc_files; p->name; p++)
			remove_proc_entry(p->name, sbi->s_proc);
		remove_proc_entry(sb->s_id, ext4_proc_root);
	}
	kobject_del(&sbi->s_kobj);
}

int __init ext4_init_sysfs(void)
{
	int ret;

	kobject_set_name(&ext4_kset.kobj, "ext4");
	ext4_kset.kobj.parent = fs_kobj;
	ret = kset_register(&ext4_kset);
	if (ret)
		return ret;

	ret = kobject_init_and_add(&ext4_feat, &ext4_feat_ktype,
				   NULL, "features");
	if (ret)
		kset_unregister(&ext4_kset);
	else
		ext4_proc_root = proc_mkdir(proc_dirname, NULL);
	return ret;
}

void ext4_exit_sysfs(void)
{
	kobject_put(&ext4_feat);
	kset_unregister(&ext4_kset);
	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>
	14	#include <linux/proc_fs.h>
	15
	16	#include "ext4.h"
	17	#include "ext4_jbd2.h"
	18
76d33bca TT	19	typedef enum {
	20	attr_noop,
	21	attr_delayed_allocation_blocks,
	22	attr_session_write_kbytes,
	23	attr_lifetime_write_kbytes,
	24	attr_reserved_clusters,
	25	attr_inode_readahead,
	26	attr_trigger_test_error,
	27	attr_feature,
	28	attr_pointer_ui,
	29	attr_pointer_atomic,
	30	} attr_id_t;
	31
	32	typedef enum {
	33	ptr_explicit,
	34	ptr_ext4_sb_info_offset,
	35	ptr_ext4_super_block_offset,
	36	} attr_ptr_t;
	37
d6006186	38	static const char proc_dirname[] = "fs/ext4";
ebd173be TT	39	static struct proc_dir_entry *ext4_proc_root;
ebd173be TT	40
b5799018 TT	41	struct ext4_attr {
b5799018 TT	42	struct attribute attr;
76d33bca TT	43	short attr_id;
76d33bca TT	44	short attr_ptr;
b5799018 TT	45	union {
b5799018 TT	46	int offset;
76d33bca	47	void *explicit_ptr;
b5799018 TT	48	} u;
	49	};
	50
b5799018 TT	51	static ssize_t session_write_kbytes_show(struct ext4_attr *a,
	52	struct ext4_sb_info sbi, char buf)
	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
	63	static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
	64	struct ext4_sb_info sbi, char buf)
	65	{
	66	struct super_block *sb = sbi->s_buddy_cache->i_sb;
	67
	68	if (!sb->s_bdev->bd_part)
	69	return snprintf(buf, PAGE_SIZE, "0\n");
	70	return snprintf(buf, PAGE_SIZE, "%llu\n",
	71	(unsigned long long)(sbi->s_kbytes_written +
	72	((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
	73	EXT4_SB(sb)->s_sectors_written_start) >> 1)));
	74	}
	75
	76	static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
	77	struct ext4_sb_info *sbi,
	78	const char *buf, size_t count)
	79	{
	80	unsigned long t;
	81	int ret;
	82
	83	ret = kstrtoul(skip_spaces(buf), 0, &t);
	84	if (ret)
	85	return ret;
	86
	87	if (t && (!is_power_of_2(t) \|\| t > 0x40000000))
	88	return -EINVAL;
	89
	90	sbi->s_inode_readahead_blks = t;
	91	return count;
	92	}
	93
b5799018 TT	94	static ssize_t reserved_clusters_store(struct ext4_attr *a,
	95	struct ext4_sb_info *sbi,
	96	const char *buf, size_t count)
	97	{
	98	unsigned long long val;
	99	ext4_fsblk_t clusters = (ext4_blocks_count(sbi->s_es) >>
	100	sbi->s_cluster_bits);
76d33bca	101	int ret;
b5799018	102
76d33bca	103	ret = kstrtoull(skip_spaces(buf), 0, &val);
1ea1516f	104	if (ret \|\| val >= clusters)
b5799018 TT	105	return -EINVAL;
	106
	107	atomic64_set(&sbi->s_resv_clusters, val);
	108	return count;
	109	}
	110
	111	static ssize_t trigger_test_error(struct ext4_attr *a,
	112	struct ext4_sb_info *sbi,
	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);
	189	EXT4_RO_ATTR_ES_UI(first_error_time, s_first_error_time);
	190	EXT4_RO_ATTR_ES_UI(last_error_time, s_last_error_time);
	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
b5799018 TT	256	static ssize_t ext4_attr_show(struct kobject *kobj,
	257	struct attribute attr, char buf)
	258	{
	259	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
	260	s_kobj);
	261	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
76d33bca TT	262	void *ptr = calc_ptr(a, sbi);
	263
	264	switch (a->attr_id) {
	265	case attr_delayed_allocation_blocks:
	266	return snprintf(buf, PAGE_SIZE, "%llu\n",
	267	(s64) EXT4_C2B(sbi,
	268	percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
	269	case attr_session_write_kbytes:
	270	return session_write_kbytes_show(a, sbi, buf);
	271	case attr_lifetime_write_kbytes:
	272	return lifetime_write_kbytes_show(a, sbi, buf);
	273	case attr_reserved_clusters:
	274	return snprintf(buf, PAGE_SIZE, "%llu\n",
	275	(unsigned long long)
	276	atomic64_read(&sbi->s_resv_clusters));
	277	case attr_inode_readahead:
	278	case attr_pointer_ui:
	279	if (!ptr)
	280	return 0;
	281	return snprintf(buf, PAGE_SIZE, "%u\n",
	282	((unsigned int ) ptr));
	283	case attr_pointer_atomic:
	284	if (!ptr)
	285	return 0;
	286	return snprintf(buf, PAGE_SIZE, "%d\n",
	287	atomic_read((atomic_t *) ptr));
	288	case attr_feature:
	289	return snprintf(buf, PAGE_SIZE, "supported\n");
	290	}
	291
	292	return 0;
b5799018 TT	293	}
	294
	295	static ssize_t ext4_attr_store(struct kobject *kobj,
	296	struct attribute *attr,
	297	const char *buf, size_t len)
	298	{
	299	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
	300	s_kobj);
	301	struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
76d33bca TT	302	void *ptr = calc_ptr(a, sbi);
	303	unsigned long t;
	304	int ret;
b5799018	305
76d33bca TT	306	switch (a->attr_id) {
	307	case attr_reserved_clusters:
	308	return reserved_clusters_store(a, sbi, buf, len);
	309	case attr_pointer_ui:
	310	if (!ptr)
	311	return 0;
	312	ret = kstrtoul(skip_spaces(buf), 0, &t);
	313	if (ret)
	314	return ret;
	315	((unsigned int ) ptr) = t;
	316	return len;
	317	case attr_inode_readahead:
	318	return inode_readahead_blks_store(a, sbi, buf, len);
	319	case attr_trigger_test_error:
	320	return trigger_test_error(a, sbi, buf, len);
	321	}
	322	return 0;
b5799018 TT	323	}
	324
	325	static void ext4_sb_release(struct kobject *kobj)
	326	{
	327	struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
	328	s_kobj);
	329	complete(&sbi->s_kobj_unregister);
	330	}
	331
	332	static const struct sysfs_ops ext4_attr_ops = {
	333	.show = ext4_attr_show,
	334	.store = ext4_attr_store,
	335	};
	336
	337	static struct kobj_type ext4_sb_ktype = {
	338	.default_attrs = ext4_attrs,
	339	.sysfs_ops = &ext4_attr_ops,
	340	.release = ext4_sb_release,
	341	};
	342
	343	static struct kobj_type ext4_ktype = {
	344	.sysfs_ops = &ext4_attr_ops,
	345	};
	346
	347	static struct kset ext4_kset = {
	348	.kobj = {.ktype = &ext4_ktype},
	349	};
	350
b5799018 TT	351	static struct kobj_type ext4_feat_ktype = {
b5799018 TT	352	.default_attrs = ext4_feat_attrs,
76d33bca	353	.sysfs_ops = &ext4_attr_ops,
b5799018 TT	354	};
	355
	356	static struct kobject ext4_feat = {
	357	.kset = &ext4_kset,
	358	};
	359
ebd173be TT	360	#define PROC_FILE_SHOW_DEFN(name) \
	361	static int name##_open(struct inode inode, struct file file) \
	362	{ \
	363	return single_open(file, ext4_seq_##name##_show, PDE_DATA(inode)); \
	364	} \
	365	\
681c46b1	366	static const struct file_operations ext4_seq_##name##_fops = { \
ebd173be TT	367	.open = name##_open, \
	368	.read = seq_read, \
	369	.llseek = seq_lseek, \
	370	.release = single_release, \
	371	}
	372
	373	#define PROC_FILE_LIST(name) \
	374	{ __stringify(name), &ext4_seq_##name##_fops }
	375
	376	PROC_FILE_SHOW_DEFN(es_shrinker_info);
	377	PROC_FILE_SHOW_DEFN(options);
	378
d6006186	379	static const struct ext4_proc_files {
ebd173be TT	380	const char *name;
	381	const struct file_operations *fops;
	382	} proc_files[] = {
	383	PROC_FILE_LIST(options),
	384	PROC_FILE_LIST(es_shrinker_info),
	385	PROC_FILE_LIST(mb_groups),
	386	{ NULL, NULL },
	387	};
	388
b5799018 TT	389	int ext4_register_sysfs(struct super_block *sb)
	390	{
	391	struct ext4_sb_info *sbi = EXT4_SB(sb);
d6006186	392	const struct ext4_proc_files *p;
ebd173be	393	int err;
b5799018 TT	394
	395	sbi->s_kobj.kset = &ext4_kset;
	396	init_completion(&sbi->s_kobj_unregister);
ebd173be TT	397	err = kobject_init_and_add(&sbi->s_kobj, &ext4_sb_ktype, NULL,
	398	"%s", sb->s_id);
	399	if (err)
	400	return err;
	401
	402	if (ext4_proc_root)
	403	sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
	404
	405	if (sbi->s_proc) {
	406	for (p = proc_files; p->name; p++)
	407	proc_create_data(p->name, S_IRUGO, sbi->s_proc,
	408	p->fops, sb);
	409	}
	410	return 0;
	411	}
	412
	413	void ext4_unregister_sysfs(struct super_block *sb)
	414	{
	415	struct ext4_sb_info *sbi = EXT4_SB(sb);
d6006186	416	const struct ext4_proc_files *p;
ebd173be TT	417
	418	if (sbi->s_proc) {
	419	for (p = proc_files; p->name; p++)
	420	remove_proc_entry(p->name, sbi->s_proc);
	421	remove_proc_entry(sb->s_id, ext4_proc_root);
	422	}
	423	kobject_del(&sbi->s_kobj);
b5799018 TT	424	}
	425
	426	int __init ext4_init_sysfs(void)
	427	{
	428	int ret;
	429
	430	kobject_set_name(&ext4_kset.kobj, "ext4");
	431	ext4_kset.kobj.parent = fs_kobj;
	432	ret = kset_register(&ext4_kset);
	433	if (ret)
	434	return ret;
	435
	436	ret = kobject_init_and_add(&ext4_feat, &ext4_feat_ktype,
	437	NULL, "features");
	438	if (ret)
	439	kset_unregister(&ext4_kset);
ebd173be TT	440	else
ebd173be TT	441	ext4_proc_root = proc_mkdir(proc_dirname, NULL);
b5799018 TT	442	return ret;
	443	}
	444
	445	void ext4_exit_sysfs(void)
	446	{
	447	kobject_put(&ext4_feat);
	448	kset_unregister(&ext4_kset);
ebd173be TT	449	remove_proc_entry(proc_dirname, NULL);
ebd173be TT	450	ext4_proc_root = NULL;
b5799018 TT	451	}
b5799018 TT	452