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