mirror of
https://github.com/torvalds/linux.git
synced 2024-11-27 14:41:39 +00:00
2b188a2cfc
Since commit ee6d3dd4ed ("driver core: make kobj_type constant.")
the driver core allows the usage of const struct kobj_type.
Take advantage of this to constify the structure definition to prevent
modification at runtime.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
135 lines
3.2 KiB
C
135 lines
3.2 KiB
C
// 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);
|
|
};
|
|
|
|
#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 const 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;
|
|
}
|