forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
252 lines
6.2 KiB
252 lines
6.2 KiB
// 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 <uapi/linux/limits.h> |
|
#include <linux/kobject.h> |
|
#include <linux/sysfs.h> |
|
#include <linux/stat.h> |
|
#include <linux/genhd.h> |
|
#include <linux/list.h> |
|
#include <linux/moduleparam.h> |
|
#include <linux/device.h> |
|
|
|
#include "rnbd-srv.h" |
|
|
|
static struct device *rnbd_dev; |
|
static struct class *rnbd_dev_class; |
|
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 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, |
|
const char *dev_name) |
|
{ |
|
struct kobject *bdev_kobj; |
|
int ret; |
|
|
|
ret = kobject_init_and_add(&dev->dev_kobj, &dev_ktype, |
|
rnbd_devs_kobj, dev_name); |
|
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); |
|
|
|
return scnprintf(page, PAGE_SIZE, "%d\n", |
|
!(sess_dev->open_flags & FMODE_WRITE)); |
|
} |
|
|
|
static struct kobj_attribute rnbd_srv_dev_session_ro_attr = |
|
__ATTR_RO(read_only); |
|
|
|
static ssize_t access_mode_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); |
|
|
|
return scnprintf(page, PAGE_SIZE, "%s\n", |
|
rnbd_access_mode_str(sess_dev->access_mode)); |
|
} |
|
|
|
static struct kobj_attribute rnbd_srv_dev_session_access_mode_attr = |
|
__ATTR_RO(access_mode); |
|
|
|
static ssize_t mapping_path_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); |
|
|
|
return scnprintf(page, PAGE_SIZE, "%s\n", sess_dev->pathname); |
|
} |
|
|
|
static struct kobj_attribute rnbd_srv_dev_session_mapping_path_attr = |
|
__ATTR_RO(mapping_path); |
|
|
|
static ssize_t rnbd_srv_dev_session_force_close_show(struct kobject *kobj, |
|
struct kobj_attribute *attr, char *page) |
|
{ |
|
return scnprintf(page, PAGE_SIZE, "Usage: echo 1 > %s\n", |
|
attr->attr.name); |
|
} |
|
|
|
static ssize_t rnbd_srv_dev_session_force_close_store(struct kobject *kobj, |
|
struct kobj_attribute *attr, |
|
const char *buf, size_t count) |
|
{ |
|
struct rnbd_srv_sess_dev *sess_dev; |
|
|
|
sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj); |
|
|
|
if (!sysfs_streq(buf, "1")) { |
|
rnbd_srv_err(sess_dev, "%s: invalid value: '%s'\n", |
|
attr->attr.name, buf); |
|
return -EINVAL; |
|
} |
|
|
|
rnbd_srv_info(sess_dev, "force close requested\n"); |
|
rnbd_srv_sess_dev_force_close(sess_dev, attr); |
|
|
|
return count; |
|
} |
|
|
|
static struct kobj_attribute rnbd_srv_dev_session_force_close_attr = |
|
__ATTR(force_close, 0644, |
|
rnbd_srv_dev_session_force_close_show, |
|
rnbd_srv_dev_session_force_close_store); |
|
|
|
static struct attribute *rnbd_srv_default_dev_sessions_attrs[] = { |
|
&rnbd_srv_dev_session_access_mode_attr.attr, |
|
&rnbd_srv_dev_session_ro_attr.attr, |
|
&rnbd_srv_dev_session_mapping_path_attr.attr, |
|
&rnbd_srv_dev_session_force_close_attr.attr, |
|
NULL, |
|
}; |
|
|
|
static struct attribute_group rnbd_srv_default_dev_session_attr_group = { |
|
.attrs = rnbd_srv_default_dev_sessions_attrs, |
|
}; |
|
|
|
void rnbd_srv_destroy_dev_session_sysfs(struct rnbd_srv_sess_dev *sess_dev) |
|
{ |
|
sysfs_remove_group(&sess_dev->kobj, |
|
&rnbd_srv_default_dev_session_attr_group); |
|
|
|
kobject_del(&sess_dev->kobj); |
|
kobject_put(&sess_dev->kobj); |
|
} |
|
|
|
static void rnbd_srv_sess_dev_release(struct kobject *kobj) |
|
{ |
|
struct rnbd_srv_sess_dev *sess_dev; |
|
|
|
sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj); |
|
rnbd_destroy_sess_dev(sess_dev, sess_dev->keep_id); |
|
} |
|
|
|
static struct kobj_type rnbd_srv_sess_dev_ktype = { |
|
.sysfs_ops = &kobj_sysfs_ops, |
|
.release = rnbd_srv_sess_dev_release, |
|
}; |
|
|
|
int rnbd_srv_create_dev_session_sysfs(struct rnbd_srv_sess_dev *sess_dev) |
|
{ |
|
int ret; |
|
|
|
ret = kobject_init_and_add(&sess_dev->kobj, &rnbd_srv_sess_dev_ktype, |
|
sess_dev->dev->dev_sessions_kobj, "%s", |
|
sess_dev->sess->sessname); |
|
if (ret) { |
|
kobject_put(&sess_dev->kobj); |
|
return ret; |
|
} |
|
|
|
ret = sysfs_create_group(&sess_dev->kobj, |
|
&rnbd_srv_default_dev_session_attr_group); |
|
if (ret) { |
|
kobject_del(&sess_dev->kobj); |
|
kobject_put(&sess_dev->kobj); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
int rnbd_srv_create_sysfs_files(void) |
|
{ |
|
int err; |
|
|
|
rnbd_dev_class = class_create(THIS_MODULE, "rnbd-server"); |
|
if (IS_ERR(rnbd_dev_class)) |
|
return PTR_ERR(rnbd_dev_class); |
|
|
|
rnbd_dev = device_create(rnbd_dev_class, NULL, |
|
MKDEV(0, 0), NULL, "ctl"); |
|
if (IS_ERR(rnbd_dev)) { |
|
err = PTR_ERR(rnbd_dev); |
|
goto cls_destroy; |
|
} |
|
rnbd_devs_kobj = kobject_create_and_add("devices", &rnbd_dev->kobj); |
|
if (!rnbd_devs_kobj) { |
|
err = -ENOMEM; |
|
goto dev_destroy; |
|
} |
|
|
|
return 0; |
|
|
|
dev_destroy: |
|
device_destroy(rnbd_dev_class, MKDEV(0, 0)); |
|
cls_destroy: |
|
class_destroy(rnbd_dev_class); |
|
|
|
return err; |
|
} |
|
|
|
void rnbd_srv_destroy_sysfs_files(void) |
|
{ |
|
kobject_del(rnbd_devs_kobj); |
|
kobject_put(rnbd_devs_kobj); |
|
device_destroy(rnbd_dev_class, MKDEV(0, 0)); |
|
class_destroy(rnbd_dev_class); |
|
}
|
|
|