block/rnbd: server: sysfs interface functions
This is the sysfs interface to rnbd mapped devices on server side:
/sys/class/rnbd-server/ctl/devices/<device_name>/
|- block_dev
| *** link pointing to the corresponding block device sysfs entry
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|- sessions/<session-name>/
| *** sessions directory
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|- read_only
| *** is devices mapped as read only
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|- mapping_path
*** relative device path provided by the client during mapping
Link: https://lore.kernel.org/r/20200511135131.27580-23-danil.kipnis@cloud.ionos.com
Signed-off-by: Danil Kipnis <danil.kipnis@cloud.ionos.com>
Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Jack Wang
Jason Gunthorpe
parent
f0aad9baad
commit
8cee532f46
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@ -0,0 +1,215 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* RDMA Network Block Driver
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*
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* Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
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* Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
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* Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
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*/
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#undef pr_fmt
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#define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt
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#include <uapi/linux/limits.h>
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#include <linux/kobject.h>
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#include <linux/sysfs.h>
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#include <linux/stat.h>
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#include <linux/genhd.h>
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#include <linux/list.h>
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#include <linux/moduleparam.h>
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#include <linux/device.h>
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#include "rnbd-srv.h"
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static struct device *rnbd_dev;
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static struct class *rnbd_dev_class;
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static struct kobject *rnbd_devs_kobj;
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static void rnbd_srv_dev_release(struct kobject *kobj)
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{
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struct rnbd_srv_dev *dev;
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dev = container_of(kobj, struct rnbd_srv_dev, dev_kobj);
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kfree(dev);
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}
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static struct kobj_type dev_ktype = {
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.sysfs_ops = &kobj_sysfs_ops,
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.release = rnbd_srv_dev_release
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};
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int rnbd_srv_create_dev_sysfs(struct rnbd_srv_dev *dev,
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struct block_device *bdev,
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const char *dev_name)
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{
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struct kobject *bdev_kobj;
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int ret;
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ret = kobject_init_and_add(&dev->dev_kobj, &dev_ktype,
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rnbd_devs_kobj, dev_name);
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if (ret)
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return ret;
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dev->dev_sessions_kobj = kobject_create_and_add("sessions",
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&dev->dev_kobj);
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if (!dev->dev_sessions_kobj)
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goto put_dev_kobj;
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bdev_kobj = &disk_to_dev(bdev->bd_disk)->kobj;
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ret = sysfs_create_link(&dev->dev_kobj, bdev_kobj, "block_dev");
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if (ret)
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goto put_sess_kobj;
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return 0;
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put_sess_kobj:
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kobject_put(dev->dev_sessions_kobj);
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put_dev_kobj:
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kobject_put(&dev->dev_kobj);
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return ret;
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}
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void rnbd_srv_destroy_dev_sysfs(struct rnbd_srv_dev *dev)
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{
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sysfs_remove_link(&dev->dev_kobj, "block_dev");
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kobject_del(dev->dev_sessions_kobj);
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kobject_put(dev->dev_sessions_kobj);
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kobject_del(&dev->dev_kobj);
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kobject_put(&dev->dev_kobj);
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}
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static ssize_t read_only_show(struct kobject *kobj, struct kobj_attribute *attr,
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char *page)
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{
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struct rnbd_srv_sess_dev *sess_dev;
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sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj);
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return scnprintf(page, PAGE_SIZE, "%d\n",
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!(sess_dev->open_flags & FMODE_WRITE));
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}
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static struct kobj_attribute rnbd_srv_dev_session_ro_attr =
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__ATTR_RO(read_only);
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static ssize_t access_mode_show(struct kobject *kobj,
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struct kobj_attribute *attr,
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char *page)
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{
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struct rnbd_srv_sess_dev *sess_dev;
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sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj);
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return scnprintf(page, PAGE_SIZE, "%s\n",
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rnbd_access_mode_str(sess_dev->access_mode));
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}
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static struct kobj_attribute rnbd_srv_dev_session_access_mode_attr =
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__ATTR_RO(access_mode);
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static ssize_t mapping_path_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *page)
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{
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struct rnbd_srv_sess_dev *sess_dev;
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sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj);
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return scnprintf(page, PAGE_SIZE, "%s\n", sess_dev->pathname);
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}
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static struct kobj_attribute rnbd_srv_dev_session_mapping_path_attr =
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__ATTR_RO(mapping_path);
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static struct attribute *rnbd_srv_default_dev_sessions_attrs[] = {
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&rnbd_srv_dev_session_access_mode_attr.attr,
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&rnbd_srv_dev_session_ro_attr.attr,
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&rnbd_srv_dev_session_mapping_path_attr.attr,
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NULL,
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};
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static struct attribute_group rnbd_srv_default_dev_session_attr_group = {
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.attrs = rnbd_srv_default_dev_sessions_attrs,
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};
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void rnbd_srv_destroy_dev_session_sysfs(struct rnbd_srv_sess_dev *sess_dev)
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{
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sysfs_remove_group(&sess_dev->kobj,
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&rnbd_srv_default_dev_session_attr_group);
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kobject_del(&sess_dev->kobj);
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kobject_put(&sess_dev->kobj);
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}
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static void rnbd_srv_sess_dev_release(struct kobject *kobj)
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{
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struct rnbd_srv_sess_dev *sess_dev;
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sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj);
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rnbd_destroy_sess_dev(sess_dev);
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}
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static struct kobj_type rnbd_srv_sess_dev_ktype = {
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.sysfs_ops = &kobj_sysfs_ops,
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.release = rnbd_srv_sess_dev_release,
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};
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int rnbd_srv_create_dev_session_sysfs(struct rnbd_srv_sess_dev *sess_dev)
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{
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int ret;
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ret = kobject_init_and_add(&sess_dev->kobj, &rnbd_srv_sess_dev_ktype,
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sess_dev->dev->dev_sessions_kobj, "%s",
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sess_dev->sess->sessname);
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if (ret)
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return ret;
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ret = sysfs_create_group(&sess_dev->kobj,
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&rnbd_srv_default_dev_session_attr_group);
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if (ret)
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goto err;
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return 0;
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err:
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kobject_put(&sess_dev->kobj);
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return ret;
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}
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int rnbd_srv_create_sysfs_files(void)
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{
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int err;
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rnbd_dev_class = class_create(THIS_MODULE, "rnbd-server");
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if (IS_ERR(rnbd_dev_class))
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return PTR_ERR(rnbd_dev_class);
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rnbd_dev = device_create(rnbd_dev_class, NULL,
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MKDEV(0, 0), NULL, "ctl");
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if (IS_ERR(rnbd_dev)) {
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err = PTR_ERR(rnbd_dev);
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goto cls_destroy;
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}
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rnbd_devs_kobj = kobject_create_and_add("devices", &rnbd_dev->kobj);
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if (!rnbd_devs_kobj) {
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err = -ENOMEM;
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goto dev_destroy;
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}
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return 0;
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dev_destroy:
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device_destroy(rnbd_dev_class, MKDEV(0, 0));
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cls_destroy:
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class_destroy(rnbd_dev_class);
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return err;
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}
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void rnbd_srv_destroy_sysfs_files(void)
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{
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kobject_del(rnbd_devs_kobj);
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kobject_put(rnbd_devs_kobj);
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device_destroy(rnbd_dev_class, MKDEV(0, 0));
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class_destroy(rnbd_dev_class);
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}
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