linux/drivers/md/dm-sysfs.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2008 Red Hat, Inc. All rights reserved.
 *
 * This file is released under the GPL.
 */

#include <linux/sysfs.h>
#include <linux/dm-ioctl.h>
#include "dm-core.h"
#include "dm-rq.h"

struct dm_sysfs_attr { … };

#define DM_ATTR_RO(_name) …

static ssize_t dm_attr_show(struct kobject *kobj, struct attribute *attr,
			    char *page)
{ … }

#define DM_ATTR_RW(_name) …

static ssize_t dm_attr_store(struct kobject *kobj, struct attribute *attr,
			     const char *page, size_t count)
{ … }

static ssize_t dm_attr_name_show(struct mapped_device *md, char *buf)
{ … }

static ssize_t dm_attr_uuid_show(struct mapped_device *md, char *buf)
{ … }

static ssize_t dm_attr_suspended_show(struct mapped_device *md, char *buf)
{ … }

static ssize_t dm_attr_use_blk_mq_show(struct mapped_device *md, char *buf)
{ … }

static DM_ATTR_RO(name);
static DM_ATTR_RO(uuid);
static DM_ATTR_RO(suspended);
static DM_ATTR_RO(use_blk_mq);
static DM_ATTR_RW(rq_based_seq_io_merge_deadline);

static struct attribute *dm_attrs[] = …;
ATTRIBUTE_GROUPS(…);

static const struct sysfs_ops dm_sysfs_ops = …;

static const struct kobj_type dm_ktype = …;

/*
 * Initialize kobj
 * because nobody using md yet, no need to call explicit dm_get/put
 */
int dm_sysfs_init(struct mapped_device *md)
{ … }

/*
 * Remove kobj, called after all references removed
 */
void dm_sysfs_exit(struct mapped_device *md)
{ … }