Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * RDMA Network Block Driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #undef pr_fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <uapi/linux/limits.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/kobject.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/sysfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/genhd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/moduleparam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include "rnbd-srv.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) static struct device *rnbd_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) static struct class *rnbd_dev_class;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) static struct kobject *rnbd_devs_kobj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) static void rnbd_srv_dev_release(struct kobject *kobj)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	struct rnbd_srv_dev *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	dev = container_of(kobj, struct rnbd_srv_dev, dev_kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	kfree(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) static struct kobj_type dev_ktype = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	.sysfs_ops = &kobj_sysfs_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	.release = rnbd_srv_dev_release
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) int rnbd_srv_create_dev_sysfs(struct rnbd_srv_dev *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 			       struct block_device *bdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 			       const char *dev_name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	struct kobject *bdev_kobj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	ret = kobject_init_and_add(&dev->dev_kobj, &dev_ktype,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 				   rnbd_devs_kobj, dev_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	dev->dev_sessions_kobj = kobject_create_and_add("sessions",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 							&dev->dev_kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	if (!dev->dev_sessions_kobj)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		goto put_dev_kobj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	bdev_kobj = &disk_to_dev(bdev->bd_disk)->kobj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	ret = sysfs_create_link(&dev->dev_kobj, bdev_kobj, "block_dev");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		goto put_sess_kobj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) put_sess_kobj:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	kobject_put(dev->dev_sessions_kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) put_dev_kobj:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	kobject_put(&dev->dev_kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) void rnbd_srv_destroy_dev_sysfs(struct rnbd_srv_dev *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	sysfs_remove_link(&dev->dev_kobj, "block_dev");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	kobject_del(dev->dev_sessions_kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	kobject_put(dev->dev_sessions_kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	kobject_del(&dev->dev_kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	kobject_put(&dev->dev_kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) static ssize_t read_only_show(struct kobject *kobj, struct kobj_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 			      char *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	struct rnbd_srv_sess_dev *sess_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	return scnprintf(page, PAGE_SIZE, "%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 			 !(sess_dev->open_flags & FMODE_WRITE));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) static struct kobj_attribute rnbd_srv_dev_session_ro_attr =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	__ATTR_RO(read_only);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) static ssize_t access_mode_show(struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 				struct kobj_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 				char *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	struct rnbd_srv_sess_dev *sess_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	return scnprintf(page, PAGE_SIZE, "%s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 			 rnbd_access_mode_str(sess_dev->access_mode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) static struct kobj_attribute rnbd_srv_dev_session_access_mode_attr =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	__ATTR_RO(access_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static ssize_t mapping_path_show(struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 				 struct kobj_attribute *attr, char *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	struct rnbd_srv_sess_dev *sess_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	return scnprintf(page, PAGE_SIZE, "%s\n", sess_dev->pathname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) static struct kobj_attribute rnbd_srv_dev_session_mapping_path_attr =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	__ATTR_RO(mapping_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) static struct attribute *rnbd_srv_default_dev_sessions_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	&rnbd_srv_dev_session_access_mode_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	&rnbd_srv_dev_session_ro_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	&rnbd_srv_dev_session_mapping_path_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) static struct attribute_group rnbd_srv_default_dev_session_attr_group = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	.attrs = rnbd_srv_default_dev_sessions_attrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) void rnbd_srv_destroy_dev_session_sysfs(struct rnbd_srv_sess_dev *sess_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	sysfs_remove_group(&sess_dev->kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 			   &rnbd_srv_default_dev_session_attr_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	kobject_del(&sess_dev->kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	kobject_put(&sess_dev->kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) static void rnbd_srv_sess_dev_release(struct kobject *kobj)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	struct rnbd_srv_sess_dev *sess_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	sess_dev = container_of(kobj, struct rnbd_srv_sess_dev, kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	rnbd_destroy_sess_dev(sess_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) static struct kobj_type rnbd_srv_sess_dev_ktype = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	.sysfs_ops	= &kobj_sysfs_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	.release	= rnbd_srv_sess_dev_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) int rnbd_srv_create_dev_session_sysfs(struct rnbd_srv_sess_dev *sess_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	ret = kobject_init_and_add(&sess_dev->kobj, &rnbd_srv_sess_dev_ktype,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 				   sess_dev->dev->dev_sessions_kobj, "%s",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 				   sess_dev->sess->sessname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	ret = sysfs_create_group(&sess_dev->kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 				 &rnbd_srv_default_dev_session_attr_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	kobject_put(&sess_dev->kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) int rnbd_srv_create_sysfs_files(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	rnbd_dev_class = class_create(THIS_MODULE, "rnbd-server");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	if (IS_ERR(rnbd_dev_class))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		return PTR_ERR(rnbd_dev_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	rnbd_dev = device_create(rnbd_dev_class, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 				  MKDEV(0, 0), NULL, "ctl");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	if (IS_ERR(rnbd_dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		err = PTR_ERR(rnbd_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		goto cls_destroy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	rnbd_devs_kobj = kobject_create_and_add("devices", &rnbd_dev->kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	if (!rnbd_devs_kobj) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		goto dev_destroy;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) dev_destroy:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	device_destroy(rnbd_dev_class, MKDEV(0, 0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) cls_destroy:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	class_destroy(rnbd_dev_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) void rnbd_srv_destroy_sysfs_files(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	kobject_del(rnbd_devs_kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	kobject_put(rnbd_devs_kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	device_destroy(rnbd_dev_class, MKDEV(0, 0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	class_destroy(rnbd_dev_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }