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// SPDX-License-Identifier: GPL-2.0
/*
* Simple file system for zoned block devices exposing zones as files.
*
* Copyright (C) 2022 Western Digital Corporation or its affiliates.
*/
#include <linux/fs.h>
#include <linux/seq_file.h>
#include <linux/blkdev.h>
#include "zonefs.h"
struct zonefs_sysfs_attr {
struct attribute attr;
ssize_t (*show)(struct zonefs_sb_info *sbi, char *buf);
};
static inline struct zonefs_sysfs_attr *to_attr(struct attribute *attr)
{
return container_of(attr, struct zonefs_sysfs_attr, attr);
}
#define ZONEFS_SYSFS_ATTR_RO(name) \
static struct zonefs_sysfs_attr zonefs_sysfs_attr_##name = __ATTR_RO(name)
#define ATTR_LIST(name) &zonefs_sysfs_attr_##name.attr
static ssize_t zonefs_sysfs_attr_show(struct kobject *kobj,
struct attribute *attr, char *buf)
{
struct zonefs_sb_info *sbi =
container_of(kobj, struct zonefs_sb_info, s_kobj);
struct zonefs_sysfs_attr *zonefs_attr =
container_of(attr, struct zonefs_sysfs_attr, attr);
if (!zonefs_attr->show)
return 0;
return zonefs_attr->show(sbi, buf);
}
static ssize_t max_wro_seq_files_show(struct zonefs_sb_info *sbi, char *buf)
{
return sysfs_emit(buf, "%u\n", sbi->s_max_wro_seq_files);
}
ZONEFS_SYSFS_ATTR_RO(max_wro_seq_files);
static ssize_t nr_wro_seq_files_show(struct zonefs_sb_info *sbi, char *buf)
{
return sysfs_emit(buf, "%d\n", atomic_read(&sbi->s_wro_seq_files));
}
ZONEFS_SYSFS_ATTR_RO(nr_wro_seq_files);
static ssize_t max_active_seq_files_show(struct zonefs_sb_info *sbi, char *buf)
{
return sysfs_emit(buf, "%u\n", sbi->s_max_active_seq_files);
}
ZONEFS_SYSFS_ATTR_RO(max_active_seq_files);
static ssize_t nr_active_seq_files_show(struct zonefs_sb_info *sbi, char *buf)
{
return sysfs_emit(buf, "%d\n", atomic_read(&sbi->s_active_seq_files));
}
ZONEFS_SYSFS_ATTR_RO(nr_active_seq_files);
static struct attribute *zonefs_sysfs_attrs[] = {
ATTR_LIST(max_wro_seq_files),
ATTR_LIST(nr_wro_seq_files),
ATTR_LIST(max_active_seq_files),
ATTR_LIST(nr_active_seq_files),
NULL,
};
ATTRIBUTE_GROUPS(zonefs_sysfs);
static void zonefs_sysfs_sb_release(struct kobject *kobj)
{
struct zonefs_sb_info *sbi =
container_of(kobj, struct zonefs_sb_info, s_kobj);
complete(&sbi->s_kobj_unregister);
}
static const struct sysfs_ops zonefs_sysfs_attr_ops = {
.show = zonefs_sysfs_attr_show,
};
static struct kobj_type zonefs_sb_ktype = {
.default_groups = zonefs_sysfs_groups,
.sysfs_ops = &zonefs_sysfs_attr_ops,
.release = zonefs_sysfs_sb_release,
};
static struct kobject *zonefs_sysfs_root;
int zonefs_sysfs_register(struct super_block *sb)
{
struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
int ret;
init_completion(&sbi->s_kobj_unregister);
ret = kobject_init_and_add(&sbi->s_kobj, &zonefs_sb_ktype,
zonefs_sysfs_root, "%s", sb->s_id);
if (ret) {
kobject_put(&sbi->s_kobj);
wait_for_completion(&sbi->s_kobj_unregister);
return ret;
}
sbi->s_sysfs_registered = true;
return 0;
}
void zonefs_sysfs_unregister(struct super_block *sb)
{
struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
if (!sbi || !sbi->s_sysfs_registered)
return;
kobject_del(&sbi->s_kobj);
kobject_put(&sbi->s_kobj);
wait_for_completion(&sbi->s_kobj_unregister);
}
int __init zonefs_sysfs_init(void)
{
zonefs_sysfs_root = kobject_create_and_add("zonefs", fs_kobj);
if (!zonefs_sysfs_root)
return -ENOMEM;
return 0;
}
void zonefs_sysfs_exit(void)
{
kobject_put(zonefs_sysfs_root);
zonefs_sysfs_root = NULL;
}
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