drivers/block/rnbd/rnbd-srv-sysfs.c

Source file repositories/reference/linux-study-clean/drivers/block/rnbd/rnbd-srv-sysfs.c

File Facts

System
Linux kernel
Corpus path
drivers/block/rnbd/rnbd-srv-sysfs.c
Extension
.c
Size
6152 bytes
Lines
251
Domain
Driver Families
Bucket
drivers/block
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * RDMA Network Block Driver
 *
 * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
 * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
 * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
 */
#undef pr_fmt
#define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt

#include <linux/kobject.h>
#include <linux/sysfs.h>
#include <linux/stat.h>
#include <linux/list.h>
#include <linux/moduleparam.h>
#include <linux/device.h>

#include "rnbd-srv.h"

static struct device *rnbd_dev;
static const struct class rnbd_dev_class = {
	.name = "rnbd-server",
};
static struct kobject *rnbd_devs_kobj;

static void rnbd_srv_dev_release(struct kobject *kobj)
{
	struct rnbd_srv_dev *dev;

	dev = container_of(kobj, struct rnbd_srv_dev, dev_kobj);

	kfree(dev);
}

static const struct kobj_type dev_ktype = {
	.sysfs_ops = &kobj_sysfs_ops,
	.release = rnbd_srv_dev_release
};

int rnbd_srv_create_dev_sysfs(struct rnbd_srv_dev *dev,
			       struct block_device *bdev)
{
	struct kobject *bdev_kobj;
	int ret;

	ret = kobject_init_and_add(&dev->dev_kobj, &dev_ktype,
				   rnbd_devs_kobj, "%pg", bdev);
	if (ret) {
		kobject_put(&dev->dev_kobj);
		return ret;
	}

	dev->dev_sessions_kobj = kobject_create_and_add("sessions",
							&dev->dev_kobj);
	if (!dev->dev_sessions_kobj) {
		ret = -ENOMEM;
		goto free_dev_kobj;
	}

	bdev_kobj = &disk_to_dev(bdev->bd_disk)->kobj;
	ret = sysfs_create_link(&dev->dev_kobj, bdev_kobj, "block_dev");
	if (ret)
		goto put_sess_kobj;

	return 0;

put_sess_kobj:
	kobject_put(dev->dev_sessions_kobj);
free_dev_kobj:
	kobject_del(&dev->dev_kobj);
	kobject_put(&dev->dev_kobj);
	return ret;
}

void rnbd_srv_destroy_dev_sysfs(struct rnbd_srv_dev *dev)
{
	sysfs_remove_link(&dev->dev_kobj, "block_dev");
	kobject_del(dev->dev_sessions_kobj);
	kobject_put(dev->dev_sessions_kobj);
	kobject_del(&dev->dev_kobj);
	kobject_put(&dev->dev_kobj);
}

static ssize_t read_only_show(struct kobject *kobj, struct kobj_attribute *attr,
			      char *page)
{
	struct rnbd_srv_sess_dev *sess_dev;

	sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj);

Annotation

Implementation Notes