drivers/scsi/iscsi_boot_sysfs.c - linux/kernel/git/bpf/bpf - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Export the iSCSI boot info to userland via sysfs.
  *
  * Copyright (C) 2010 Red Hat, Inc.  All rights reserved.
  * Copyright (C) 2010 Mike Christie
  */

 #include <linux/module.h>
 #include <linux/string.h>
 #include <linux/slab.h>
 #include <linux/sysfs.h>
 #include <linux/capability.h>
 #include <linux/iscsi_boot_sysfs.h>


 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>");
 MODULE_DESCRIPTION("sysfs interface and helpers to export iSCSI boot information");
 MODULE_LICENSE("GPL");
 /*
  * The kobject and attribute structures.
  */
 struct iscsi_boot_attr {
 	struct attribute attr;
 	int type;
 	ssize_t (*show) (void *data, int type, char *buf);
 };

 /*
  * The routine called for all sysfs attributes.
  */
 static ssize_t iscsi_boot_show_attribute(struct kobject *kobj,
 					 struct attribute *attr, char *buf)
 {
 	struct iscsi_boot_kobj *boot_kobj =
 			container_of(kobj, struct iscsi_boot_kobj, kobj);
 	struct iscsi_boot_attr *boot_attr =
 			container_of(attr, struct iscsi_boot_attr, attr);
 	ssize_t ret = -EIO;
 	char *str = buf;

 	if (!capable(CAP_SYS_ADMIN))
 		return -EACCES;

 	if (boot_kobj->show)
 		ret = boot_kobj->show(boot_kobj->data, boot_attr->type, str);
 	return ret;
 }

 static const struct sysfs_ops iscsi_boot_attr_ops = {
 	.show = iscsi_boot_show_attribute,
 };

 static void iscsi_boot_kobj_release(struct kobject *kobj)
 {
 	struct iscsi_boot_kobj *boot_kobj =
 			container_of(kobj, struct iscsi_boot_kobj, kobj);

 	if (boot_kobj->release)
 		boot_kobj->release(boot_kobj->data);
 	kfree(boot_kobj);
 }

 static struct kobj_type iscsi_boot_ktype = {
 	.release = iscsi_boot_kobj_release,
 	.sysfs_ops = &iscsi_boot_attr_ops,
 };

 #define iscsi_boot_rd_attr(fnname, sysfs_name, attr_type)		\
 static struct iscsi_boot_attr iscsi_boot_attr_##fnname = {	\
 	.attr	= { .name = __stringify(sysfs_name), .mode = 0444 },	\
 	.type	= attr_type,						\
 }

 /* Target attrs */
 iscsi_boot_rd_attr(tgt_index, index, ISCSI_BOOT_TGT_INDEX);
 iscsi_boot_rd_attr(tgt_flags, flags, ISCSI_BOOT_TGT_FLAGS);
 iscsi_boot_rd_attr(tgt_ip, ip-addr, ISCSI_BOOT_TGT_IP_ADDR);
 iscsi_boot_rd_attr(tgt_port, port, ISCSI_BOOT_TGT_PORT);
 iscsi_boot_rd_attr(tgt_lun, lun, ISCSI_BOOT_TGT_LUN);
 iscsi_boot_rd_attr(tgt_chap, chap-type, ISCSI_BOOT_TGT_CHAP_TYPE);
 iscsi_boot_rd_attr(tgt_nic, nic-assoc, ISCSI_BOOT_TGT_NIC_ASSOC);
 iscsi_boot_rd_attr(tgt_name, target-name, ISCSI_BOOT_TGT_NAME);
 iscsi_boot_rd_attr(tgt_chap_name, chap-name, ISCSI_BOOT_TGT_CHAP_NAME);
 iscsi_boot_rd_attr(tgt_chap_secret, chap-secret, ISCSI_BOOT_TGT_CHAP_SECRET);
 iscsi_boot_rd_attr(tgt_chap_rev_name, rev-chap-name,
 		   ISCSI_BOOT_TGT_REV_CHAP_NAME);
 iscsi_boot_rd_attr(tgt_chap_rev_secret, rev-chap-name-secret,
 		   ISCSI_BOOT_TGT_REV_CHAP_SECRET);

 static struct attribute *target_attrs[] = {
 	&iscsi_boot_attr_tgt_index.attr,
 	&iscsi_boot_attr_tgt_flags.attr,
 	&iscsi_boot_attr_tgt_ip.attr,
 	&iscsi_boot_attr_tgt_port.attr,
 	&iscsi_boot_attr_tgt_lun.attr,
 	&iscsi_boot_attr_tgt_chap.attr,
 	&iscsi_boot_attr_tgt_nic.attr,
 	&iscsi_boot_attr_tgt_name.attr,
 	&iscsi_boot_attr_tgt_chap_name.attr,
 	&iscsi_boot_attr_tgt_chap_secret.attr,
 	&iscsi_boot_attr_tgt_chap_rev_name.attr,
 	&iscsi_boot_attr_tgt_chap_rev_secret.attr,
 	NULL
 };

 static umode_t iscsi_boot_tgt_attr_is_visible(struct kobject *kobj,
 					     struct attribute *attr, int i)
 {
 	struct iscsi_boot_kobj *boot_kobj =
 			container_of(kobj, struct iscsi_boot_kobj, kobj);

 	if (attr ==  &iscsi_boot_attr_tgt_index.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_TGT_INDEX);
 	else if (attr == &iscsi_boot_attr_tgt_flags.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_TGT_FLAGS);
 	else if (attr == &iscsi_boot_attr_tgt_ip.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					      ISCSI_BOOT_TGT_IP_ADDR);
 	else if (attr == &iscsi_boot_attr_tgt_port.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					      ISCSI_BOOT_TGT_PORT);
 	else if (attr == &iscsi_boot_attr_tgt_lun.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					      ISCSI_BOOT_TGT_LUN);
 	else if (attr == &iscsi_boot_attr_tgt_chap.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_TGT_CHAP_TYPE);
 	else if (attr == &iscsi_boot_attr_tgt_nic.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_TGT_NIC_ASSOC);
 	else if (attr == &iscsi_boot_attr_tgt_name.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_TGT_NAME);
 	else if (attr == &iscsi_boot_attr_tgt_chap_name.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_TGT_CHAP_NAME);
 	else if (attr == &iscsi_boot_attr_tgt_chap_secret.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_TGT_CHAP_SECRET);
 	else if (attr == &iscsi_boot_attr_tgt_chap_rev_name.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_TGT_REV_CHAP_NAME);
 	else if (attr == &iscsi_boot_attr_tgt_chap_rev_secret.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_TGT_REV_CHAP_SECRET);
 	return 0;
 }

 static struct attribute_group iscsi_boot_target_attr_group = {
 	.attrs = target_attrs,
 	.is_visible = iscsi_boot_tgt_attr_is_visible,
 };

 /* Ethernet attrs */
 iscsi_boot_rd_attr(eth_index, index, ISCSI_BOOT_ETH_INDEX);
 iscsi_boot_rd_attr(eth_flags, flags, ISCSI_BOOT_ETH_FLAGS);
 iscsi_boot_rd_attr(eth_ip, ip-addr, ISCSI_BOOT_ETH_IP_ADDR);
 iscsi_boot_rd_attr(eth_prefix, prefix-len, ISCSI_BOOT_ETH_PREFIX_LEN);
 iscsi_boot_rd_attr(eth_subnet, subnet-mask, ISCSI_BOOT_ETH_SUBNET_MASK);
 iscsi_boot_rd_attr(eth_origin, origin, ISCSI_BOOT_ETH_ORIGIN);
 iscsi_boot_rd_attr(eth_gateway, gateway, ISCSI_BOOT_ETH_GATEWAY);
 iscsi_boot_rd_attr(eth_primary_dns, primary-dns, ISCSI_BOOT_ETH_PRIMARY_DNS);
 iscsi_boot_rd_attr(eth_secondary_dns, secondary-dns,
 		   ISCSI_BOOT_ETH_SECONDARY_DNS);
 iscsi_boot_rd_attr(eth_dhcp, dhcp, ISCSI_BOOT_ETH_DHCP);
 iscsi_boot_rd_attr(eth_vlan, vlan, ISCSI_BOOT_ETH_VLAN);
 iscsi_boot_rd_attr(eth_mac, mac, ISCSI_BOOT_ETH_MAC);
 iscsi_boot_rd_attr(eth_hostname, hostname, ISCSI_BOOT_ETH_HOSTNAME);

 static struct attribute *ethernet_attrs[] = {
 	&iscsi_boot_attr_eth_index.attr,
 	&iscsi_boot_attr_eth_flags.attr,
 	&iscsi_boot_attr_eth_ip.attr,
 	&iscsi_boot_attr_eth_prefix.attr,
 	&iscsi_boot_attr_eth_subnet.attr,
 	&iscsi_boot_attr_eth_origin.attr,
 	&iscsi_boot_attr_eth_gateway.attr,
 	&iscsi_boot_attr_eth_primary_dns.attr,
 	&iscsi_boot_attr_eth_secondary_dns.attr,
 	&iscsi_boot_attr_eth_dhcp.attr,
 	&iscsi_boot_attr_eth_vlan.attr,
 	&iscsi_boot_attr_eth_mac.attr,
 	&iscsi_boot_attr_eth_hostname.attr,
 	NULL
 };

 static umode_t iscsi_boot_eth_attr_is_visible(struct kobject *kobj,
 					     struct attribute *attr, int i)
 {
 	struct iscsi_boot_kobj *boot_kobj =
 			container_of(kobj, struct iscsi_boot_kobj, kobj);

 	if (attr ==  &iscsi_boot_attr_eth_index.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_ETH_INDEX);
 	else if (attr ==  &iscsi_boot_attr_eth_flags.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_ETH_FLAGS);
 	else if (attr ==  &iscsi_boot_attr_eth_ip.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_ETH_IP_ADDR);
 	else if (attr ==  &iscsi_boot_attr_eth_prefix.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_ETH_PREFIX_LEN);
 	else if (attr ==  &iscsi_boot_attr_eth_subnet.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_ETH_SUBNET_MASK);
 	else if (attr ==  &iscsi_boot_attr_eth_origin.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_ETH_ORIGIN);
 	else if (attr ==  &iscsi_boot_attr_eth_gateway.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_ETH_GATEWAY);
 	else if (attr ==  &iscsi_boot_attr_eth_primary_dns.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_ETH_PRIMARY_DNS);
 	else if (attr ==  &iscsi_boot_attr_eth_secondary_dns.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_ETH_SECONDARY_DNS);
 	else if (attr ==  &iscsi_boot_attr_eth_dhcp.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_ETH_DHCP);
 	else if (attr ==  &iscsi_boot_attr_eth_vlan.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_ETH_VLAN);
 	else if (attr ==  &iscsi_boot_attr_eth_mac.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_ETH_MAC);
 	else if (attr ==  &iscsi_boot_attr_eth_hostname.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_ETH_HOSTNAME);
 	return 0;
 }

 static struct attribute_group iscsi_boot_ethernet_attr_group = {
 	.attrs = ethernet_attrs,
 	.is_visible = iscsi_boot_eth_attr_is_visible,
 };

 /* Initiator attrs */
 iscsi_boot_rd_attr(ini_index, index, ISCSI_BOOT_INI_INDEX);
 iscsi_boot_rd_attr(ini_flags, flags, ISCSI_BOOT_INI_FLAGS);
 iscsi_boot_rd_attr(ini_isns, isns-server, ISCSI_BOOT_INI_ISNS_SERVER);
 iscsi_boot_rd_attr(ini_slp, slp-server, ISCSI_BOOT_INI_SLP_SERVER);
 iscsi_boot_rd_attr(ini_primary_radius, pri-radius-server,
 		   ISCSI_BOOT_INI_PRI_RADIUS_SERVER);
 iscsi_boot_rd_attr(ini_secondary_radius, sec-radius-server,
 		   ISCSI_BOOT_INI_SEC_RADIUS_SERVER);
 iscsi_boot_rd_attr(ini_name, initiator-name, ISCSI_BOOT_INI_INITIATOR_NAME);

 static struct attribute *initiator_attrs[] = {
 	&iscsi_boot_attr_ini_index.attr,
 	&iscsi_boot_attr_ini_flags.attr,
 	&iscsi_boot_attr_ini_isns.attr,
 	&iscsi_boot_attr_ini_slp.attr,
 	&iscsi_boot_attr_ini_primary_radius.attr,
 	&iscsi_boot_attr_ini_secondary_radius.attr,
 	&iscsi_boot_attr_ini_name.attr,
 	NULL
 };

 static umode_t iscsi_boot_ini_attr_is_visible(struct kobject *kobj,
 					     struct attribute *attr, int i)
 {
 	struct iscsi_boot_kobj *boot_kobj =
 			container_of(kobj, struct iscsi_boot_kobj, kobj);

 	if (attr ==  &iscsi_boot_attr_ini_index.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_INI_INDEX);
 	if (attr ==  &iscsi_boot_attr_ini_flags.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_INI_FLAGS);
 	if (attr ==  &iscsi_boot_attr_ini_isns.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_INI_ISNS_SERVER);
 	if (attr ==  &iscsi_boot_attr_ini_slp.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_INI_SLP_SERVER);
 	if (attr ==  &iscsi_boot_attr_ini_primary_radius.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_INI_PRI_RADIUS_SERVER);
 	if (attr ==  &iscsi_boot_attr_ini_secondary_radius.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_INI_SEC_RADIUS_SERVER);
 	if (attr ==  &iscsi_boot_attr_ini_name.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_INI_INITIATOR_NAME);

 	return 0;
 }

 static struct attribute_group iscsi_boot_initiator_attr_group = {
 	.attrs = initiator_attrs,
 	.is_visible = iscsi_boot_ini_attr_is_visible,
 };

 /* iBFT ACPI Table attributes */
 iscsi_boot_rd_attr(acpitbl_signature, signature, ISCSI_BOOT_ACPITBL_SIGNATURE);
 iscsi_boot_rd_attr(acpitbl_oem_id, oem_id, ISCSI_BOOT_ACPITBL_OEM_ID);
 iscsi_boot_rd_attr(acpitbl_oem_table_id, oem_table_id,
 		   ISCSI_BOOT_ACPITBL_OEM_TABLE_ID);

 static struct attribute *acpitbl_attrs[] = {
 	&iscsi_boot_attr_acpitbl_signature.attr,
 	&iscsi_boot_attr_acpitbl_oem_id.attr,
 	&iscsi_boot_attr_acpitbl_oem_table_id.attr,
 	NULL
 };

 static umode_t iscsi_boot_acpitbl_attr_is_visible(struct kobject *kobj,
 					     struct attribute *attr, int i)
 {
 	struct iscsi_boot_kobj *boot_kobj =
 			container_of(kobj, struct iscsi_boot_kobj, kobj);

 	if (attr ==  &iscsi_boot_attr_acpitbl_signature.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_ACPITBL_SIGNATURE);
 	if (attr ==  &iscsi_boot_attr_acpitbl_oem_id.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_ACPITBL_OEM_ID);
 	if (attr ==  &iscsi_boot_attr_acpitbl_oem_table_id.attr)
 		return boot_kobj->is_visible(boot_kobj->data,
 					     ISCSI_BOOT_ACPITBL_OEM_TABLE_ID);
 	return 0;
 }

 static struct attribute_group iscsi_boot_acpitbl_attr_group = {
 	.attrs = acpitbl_attrs,
 	.is_visible = iscsi_boot_acpitbl_attr_is_visible,
 };

 static struct iscsi_boot_kobj *
 iscsi_boot_create_kobj(struct iscsi_boot_kset *boot_kset,
 		       struct attribute_group *attr_group,
 		       const char *name, int index, void *data,
 		       ssize_t (*show) (void *data, int type, char *buf),
 		       umode_t (*is_visible) (void *data, int type),
 		       void (*release) (void *data))
 {
 	struct iscsi_boot_kobj *boot_kobj;

 	boot_kobj = kzalloc(sizeof(*boot_kobj), GFP_KERNEL);
 	if (!boot_kobj)
 		return NULL;
 	INIT_LIST_HEAD(&boot_kobj->list);

 	boot_kobj->kobj.kset = boot_kset->kset;
 	if (kobject_init_and_add(&boot_kobj->kobj, &iscsi_boot_ktype,
 				 NULL, name, index)) {
 		kfree(boot_kobj);
 		return NULL;
 	}
 	boot_kobj->data = data;
 	boot_kobj->show = show;
 	boot_kobj->is_visible = is_visible;
 	boot_kobj->release = release;

 	if (sysfs_create_group(&boot_kobj->kobj, attr_group)) {
 		/*
 		 * We do not want to free this because the caller
 		 * will assume that since the creation call failed
 		 * the boot kobj was not setup and the normal release
 		 * path is not being run.
 		 */
 		boot_kobj->release = NULL;
 		kobject_put(&boot_kobj->kobj);
 		return NULL;
 	}
 	boot_kobj->attr_group = attr_group;

 	kobject_uevent(&boot_kobj->kobj, KOBJ_ADD);
 	/* Nothing broke so lets add it to the list. */
 	list_add_tail(&boot_kobj->list, &boot_kset->kobj_list);
 	return boot_kobj;
 }

 static void iscsi_boot_remove_kobj(struct iscsi_boot_kobj *boot_kobj)
 {
 	list_del(&boot_kobj->list);
 	sysfs_remove_group(&boot_kobj->kobj, boot_kobj->attr_group);
 	kobject_put(&boot_kobj->kobj);
 }

 /**
  * iscsi_boot_create_target() - create boot target sysfs dir
  * @boot_kset: boot kset
  * @index: the target id
  * @data: driver specific data for target
  * @show: attr show function
  * @is_visible: attr visibility function
  * @release: release function
  *
  * Note: The boot sysfs lib will free the data passed in for the caller
  * when all refs to the target kobject have been released.
  */
 struct iscsi_boot_kobj *
 iscsi_boot_create_target(struct iscsi_boot_kset *boot_kset, int index,
 			 void *data,
 			 ssize_t (*show) (void *data, int type, char *buf),
 			 umode_t (*is_visible) (void *data, int type),
 			 void (*release) (void *data))
 {
 	return iscsi_boot_create_kobj(boot_kset, &iscsi_boot_target_attr_group,
 				      "target%d", index, data, show, is_visible,
 				      release);
 }
 EXPORT_SYMBOL_GPL(iscsi_boot_create_target);

 /**
  * iscsi_boot_create_initiator() - create boot initiator sysfs dir
  * @boot_kset: boot kset
  * @index: the initiator id
  * @data: driver specific data
  * @show: attr show function
  * @is_visible: attr visibility function
  * @release: release function
  *
  * Note: The boot sysfs lib will free the data passed in for the caller
  * when all refs to the initiator kobject have been released.
  */
 struct iscsi_boot_kobj *
 iscsi_boot_create_initiator(struct iscsi_boot_kset *boot_kset, int index,
 			    void *data,
 			    ssize_t (*show) (void *data, int type, char *buf),
 			    umode_t (*is_visible) (void *data, int type),
 			    void (*release) (void *data))
 {
 	return iscsi_boot_create_kobj(boot_kset,
 				      &iscsi_boot_initiator_attr_group,
 				      "initiator", index, data, show,
 				      is_visible, release);
 }
 EXPORT_SYMBOL_GPL(iscsi_boot_create_initiator);

 /**
  * iscsi_boot_create_ethernet() - create boot ethernet sysfs dir
  * @boot_kset: boot kset
  * @index: the ethernet device id
  * @data: driver specific data
  * @show: attr show function
  * @is_visible: attr visibility function
  * @release: release function
  *
  * Note: The boot sysfs lib will free the data passed in for the caller
  * when all refs to the ethernet kobject have been released.
  */
 struct iscsi_boot_kobj *
 iscsi_boot_create_ethernet(struct iscsi_boot_kset *boot_kset, int index,
 			   void *data,
 			   ssize_t (*show) (void *data, int type, char *buf),
 			   umode_t (*is_visible) (void *data, int type),
 			   void (*release) (void *data))
 {
 	return iscsi_boot_create_kobj(boot_kset,
 				      &iscsi_boot_ethernet_attr_group,
 				      "ethernet%d", index, data, show,
 				      is_visible, release);
 }
 EXPORT_SYMBOL_GPL(iscsi_boot_create_ethernet);

 /**
  * iscsi_boot_create_acpitbl() - create boot acpi table sysfs dir
  * @boot_kset: boot kset
  * @index: not used
  * @data: driver specific data
  * @show: attr show function
  * @is_visible: attr visibility function
  * @release: release function
  *
  * Note: The boot sysfs lib will free the data passed in for the caller
  * when all refs to the acpitbl kobject have been released.
  */
 struct iscsi_boot_kobj *
 iscsi_boot_create_acpitbl(struct iscsi_boot_kset *boot_kset, int index,
 			   void *data,
 			   ssize_t (*show)(void *data, int type, char *buf),
 			   umode_t (*is_visible)(void *data, int type),
 			   void (*release)(void *data))
 {
 	return iscsi_boot_create_kobj(boot_kset,
 				      &iscsi_boot_acpitbl_attr_group,
 				      "acpi_header", index, data, show,
 				      is_visible, release);
 }
 EXPORT_SYMBOL_GPL(iscsi_boot_create_acpitbl);

 /**
  * iscsi_boot_create_kset() - creates root sysfs tree
  * @set_name: name of root dir
  */
 struct iscsi_boot_kset *iscsi_boot_create_kset(const char *set_name)
 {
 	struct iscsi_boot_kset *boot_kset;

 	boot_kset = kzalloc(sizeof(*boot_kset), GFP_KERNEL);
 	if (!boot_kset)
 		return NULL;

 	boot_kset->kset = kset_create_and_add(set_name, NULL, firmware_kobj);
 	if (!boot_kset->kset) {
 		kfree(boot_kset);
 		return NULL;
 	}

 	INIT_LIST_HEAD(&boot_kset->kobj_list);
 	return boot_kset;
 }
 EXPORT_SYMBOL_GPL(iscsi_boot_create_kset);

 /**
  * iscsi_boot_create_host_kset() - creates root sysfs tree for a scsi host
  * @hostno: host number of scsi host
  */
 struct iscsi_boot_kset *iscsi_boot_create_host_kset(unsigned int hostno)
 {
 	struct iscsi_boot_kset *boot_kset;
 	char *set_name;

 	set_name = kasprintf(GFP_KERNEL, "iscsi_boot%u", hostno);
 	if (!set_name)
 		return NULL;

 	boot_kset = iscsi_boot_create_kset(set_name);
 	kfree(set_name);
 	return boot_kset;
 }
 EXPORT_SYMBOL_GPL(iscsi_boot_create_host_kset);

 /**
  * iscsi_boot_destroy_kset() - destroy kset and kobjects under it
  * @boot_kset: boot kset
  *
  * This will remove the kset and kobjects and attrs under it.
  */
 void iscsi_boot_destroy_kset(struct iscsi_boot_kset *boot_kset)
 {
 	struct iscsi_boot_kobj *boot_kobj, *tmp_kobj;

 	if (!boot_kset)
 		return;

 	list_for_each_entry_safe(boot_kobj, tmp_kobj,
 				 &boot_kset->kobj_list, list)
 		iscsi_boot_remove_kobj(boot_kobj);

 	kset_unregister(boot_kset->kset);
 	kfree(boot_kset);
 }
 EXPORT_SYMBOL_GPL(iscsi_boot_destroy_kset);
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Export the iSCSI boot info to userland via sysfs.
	*
	* Copyright (C) 2010 Red Hat, Inc. All rights reserved.
	* Copyright (C) 2010 Mike Christie
	*/

	#include <linux/module.h>
	#include <linux/string.h>
	#include <linux/slab.h>
	#include <linux/sysfs.h>
	#include <linux/capability.h>
	#include <linux/iscsi_boot_sysfs.h>


	MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>");
	MODULE_DESCRIPTION("sysfs interface and helpers to export iSCSI boot information");
	MODULE_LICENSE("GPL");
	/*
	* The kobject and attribute structures.
	*/
	struct iscsi_boot_attr {
	struct attribute attr;
	int type;
	ssize_t (show) (void data, int type, char *buf);
	};

	/*
	* The routine called for all sysfs attributes.
	*/
	static ssize_t iscsi_boot_show_attribute(struct kobject *kobj,
	struct attribute attr, char buf)
	{
	struct iscsi_boot_kobj *boot_kobj =
	container_of(kobj, struct iscsi_boot_kobj, kobj);
	struct iscsi_boot_attr *boot_attr =
	container_of(attr, struct iscsi_boot_attr, attr);
	ssize_t ret = -EIO;
	char *str = buf;

	if (!capable(CAP_SYS_ADMIN))
	return -EACCES;

	if (boot_kobj->show)
	ret = boot_kobj->show(boot_kobj->data, boot_attr->type, str);
	return ret;
	}

	static const struct sysfs_ops iscsi_boot_attr_ops = {
	.show = iscsi_boot_show_attribute,
	};

	static void iscsi_boot_kobj_release(struct kobject *kobj)
	{
	struct iscsi_boot_kobj *boot_kobj =
	container_of(kobj, struct iscsi_boot_kobj, kobj);

	if (boot_kobj->release)
	boot_kobj->release(boot_kobj->data);
	kfree(boot_kobj);
	}

	static struct kobj_type iscsi_boot_ktype = {
	.release = iscsi_boot_kobj_release,
	.sysfs_ops = &iscsi_boot_attr_ops,
	};

	#define iscsi_boot_rd_attr(fnname, sysfs_name, attr_type) \
	static struct iscsi_boot_attr iscsi_boot_attr_##fnname = { \
	.attr = { .name = __stringify(sysfs_name), .mode = 0444 }, \
	.type = attr_type, \
	}

	/* Target attrs */
	iscsi_boot_rd_attr(tgt_index, index, ISCSI_BOOT_TGT_INDEX);
	iscsi_boot_rd_attr(tgt_flags, flags, ISCSI_BOOT_TGT_FLAGS);
	iscsi_boot_rd_attr(tgt_ip, ip-addr, ISCSI_BOOT_TGT_IP_ADDR);
	iscsi_boot_rd_attr(tgt_port, port, ISCSI_BOOT_TGT_PORT);
	iscsi_boot_rd_attr(tgt_lun, lun, ISCSI_BOOT_TGT_LUN);
	iscsi_boot_rd_attr(tgt_chap, chap-type, ISCSI_BOOT_TGT_CHAP_TYPE);
	iscsi_boot_rd_attr(tgt_nic, nic-assoc, ISCSI_BOOT_TGT_NIC_ASSOC);
	iscsi_boot_rd_attr(tgt_name, target-name, ISCSI_BOOT_TGT_NAME);
	iscsi_boot_rd_attr(tgt_chap_name, chap-name, ISCSI_BOOT_TGT_CHAP_NAME);
	iscsi_boot_rd_attr(tgt_chap_secret, chap-secret, ISCSI_BOOT_TGT_CHAP_SECRET);
	iscsi_boot_rd_attr(tgt_chap_rev_name, rev-chap-name,
	ISCSI_BOOT_TGT_REV_CHAP_NAME);
	iscsi_boot_rd_attr(tgt_chap_rev_secret, rev-chap-name-secret,
	ISCSI_BOOT_TGT_REV_CHAP_SECRET);

	static struct attribute *target_attrs[] = {
	&iscsi_boot_attr_tgt_index.attr,
	&iscsi_boot_attr_tgt_flags.attr,
	&iscsi_boot_attr_tgt_ip.attr,
	&iscsi_boot_attr_tgt_port.attr,
	&iscsi_boot_attr_tgt_lun.attr,
	&iscsi_boot_attr_tgt_chap.attr,
	&iscsi_boot_attr_tgt_nic.attr,
	&iscsi_boot_attr_tgt_name.attr,
	&iscsi_boot_attr_tgt_chap_name.attr,
	&iscsi_boot_attr_tgt_chap_secret.attr,
	&iscsi_boot_attr_tgt_chap_rev_name.attr,
	&iscsi_boot_attr_tgt_chap_rev_secret.attr,
	NULL
	};

	static umode_t iscsi_boot_tgt_attr_is_visible(struct kobject *kobj,
	struct attribute *attr, int i)
	{
	struct iscsi_boot_kobj *boot_kobj =
	container_of(kobj, struct iscsi_boot_kobj, kobj);

	if (attr == &iscsi_boot_attr_tgt_index.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_TGT_INDEX);
	else if (attr == &iscsi_boot_attr_tgt_flags.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_TGT_FLAGS);
	else if (attr == &iscsi_boot_attr_tgt_ip.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_TGT_IP_ADDR);
	else if (attr == &iscsi_boot_attr_tgt_port.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_TGT_PORT);
	else if (attr == &iscsi_boot_attr_tgt_lun.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_TGT_LUN);
	else if (attr == &iscsi_boot_attr_tgt_chap.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_TGT_CHAP_TYPE);
	else if (attr == &iscsi_boot_attr_tgt_nic.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_TGT_NIC_ASSOC);
	else if (attr == &iscsi_boot_attr_tgt_name.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_TGT_NAME);
	else if (attr == &iscsi_boot_attr_tgt_chap_name.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_TGT_CHAP_NAME);
	else if (attr == &iscsi_boot_attr_tgt_chap_secret.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_TGT_CHAP_SECRET);
	else if (attr == &iscsi_boot_attr_tgt_chap_rev_name.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_TGT_REV_CHAP_NAME);
	else if (attr == &iscsi_boot_attr_tgt_chap_rev_secret.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_TGT_REV_CHAP_SECRET);
	return 0;
	}

	static struct attribute_group iscsi_boot_target_attr_group = {
	.attrs = target_attrs,
	.is_visible = iscsi_boot_tgt_attr_is_visible,
	};

	/* Ethernet attrs */
	iscsi_boot_rd_attr(eth_index, index, ISCSI_BOOT_ETH_INDEX);
	iscsi_boot_rd_attr(eth_flags, flags, ISCSI_BOOT_ETH_FLAGS);
	iscsi_boot_rd_attr(eth_ip, ip-addr, ISCSI_BOOT_ETH_IP_ADDR);
	iscsi_boot_rd_attr(eth_prefix, prefix-len, ISCSI_BOOT_ETH_PREFIX_LEN);
	iscsi_boot_rd_attr(eth_subnet, subnet-mask, ISCSI_BOOT_ETH_SUBNET_MASK);
	iscsi_boot_rd_attr(eth_origin, origin, ISCSI_BOOT_ETH_ORIGIN);
	iscsi_boot_rd_attr(eth_gateway, gateway, ISCSI_BOOT_ETH_GATEWAY);
	iscsi_boot_rd_attr(eth_primary_dns, primary-dns, ISCSI_BOOT_ETH_PRIMARY_DNS);
	iscsi_boot_rd_attr(eth_secondary_dns, secondary-dns,
	ISCSI_BOOT_ETH_SECONDARY_DNS);
	iscsi_boot_rd_attr(eth_dhcp, dhcp, ISCSI_BOOT_ETH_DHCP);
	iscsi_boot_rd_attr(eth_vlan, vlan, ISCSI_BOOT_ETH_VLAN);
	iscsi_boot_rd_attr(eth_mac, mac, ISCSI_BOOT_ETH_MAC);
	iscsi_boot_rd_attr(eth_hostname, hostname, ISCSI_BOOT_ETH_HOSTNAME);

	static struct attribute *ethernet_attrs[] = {
	&iscsi_boot_attr_eth_index.attr,
	&iscsi_boot_attr_eth_flags.attr,
	&iscsi_boot_attr_eth_ip.attr,
	&iscsi_boot_attr_eth_prefix.attr,
	&iscsi_boot_attr_eth_subnet.attr,
	&iscsi_boot_attr_eth_origin.attr,
	&iscsi_boot_attr_eth_gateway.attr,
	&iscsi_boot_attr_eth_primary_dns.attr,
	&iscsi_boot_attr_eth_secondary_dns.attr,
	&iscsi_boot_attr_eth_dhcp.attr,
	&iscsi_boot_attr_eth_vlan.attr,
	&iscsi_boot_attr_eth_mac.attr,
	&iscsi_boot_attr_eth_hostname.attr,
	NULL
	};

	static umode_t iscsi_boot_eth_attr_is_visible(struct kobject *kobj,
	struct attribute *attr, int i)
	{
	struct iscsi_boot_kobj *boot_kobj =
	container_of(kobj, struct iscsi_boot_kobj, kobj);

	if (attr == &iscsi_boot_attr_eth_index.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_ETH_INDEX);
	else if (attr == &iscsi_boot_attr_eth_flags.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_ETH_FLAGS);
	else if (attr == &iscsi_boot_attr_eth_ip.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_ETH_IP_ADDR);
	else if (attr == &iscsi_boot_attr_eth_prefix.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_ETH_PREFIX_LEN);
	else if (attr == &iscsi_boot_attr_eth_subnet.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_ETH_SUBNET_MASK);
	else if (attr == &iscsi_boot_attr_eth_origin.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_ETH_ORIGIN);
	else if (attr == &iscsi_boot_attr_eth_gateway.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_ETH_GATEWAY);
	else if (attr == &iscsi_boot_attr_eth_primary_dns.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_ETH_PRIMARY_DNS);
	else if (attr == &iscsi_boot_attr_eth_secondary_dns.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_ETH_SECONDARY_DNS);
	else if (attr == &iscsi_boot_attr_eth_dhcp.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_ETH_DHCP);
	else if (attr == &iscsi_boot_attr_eth_vlan.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_ETH_VLAN);
	else if (attr == &iscsi_boot_attr_eth_mac.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_ETH_MAC);
	else if (attr == &iscsi_boot_attr_eth_hostname.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_ETH_HOSTNAME);
	return 0;
	}

	static struct attribute_group iscsi_boot_ethernet_attr_group = {
	.attrs = ethernet_attrs,
	.is_visible = iscsi_boot_eth_attr_is_visible,
	};

	/* Initiator attrs */
	iscsi_boot_rd_attr(ini_index, index, ISCSI_BOOT_INI_INDEX);
	iscsi_boot_rd_attr(ini_flags, flags, ISCSI_BOOT_INI_FLAGS);
	iscsi_boot_rd_attr(ini_isns, isns-server, ISCSI_BOOT_INI_ISNS_SERVER);
	iscsi_boot_rd_attr(ini_slp, slp-server, ISCSI_BOOT_INI_SLP_SERVER);
	iscsi_boot_rd_attr(ini_primary_radius, pri-radius-server,
	ISCSI_BOOT_INI_PRI_RADIUS_SERVER);
	iscsi_boot_rd_attr(ini_secondary_radius, sec-radius-server,
	ISCSI_BOOT_INI_SEC_RADIUS_SERVER);
	iscsi_boot_rd_attr(ini_name, initiator-name, ISCSI_BOOT_INI_INITIATOR_NAME);

	static struct attribute *initiator_attrs[] = {
	&iscsi_boot_attr_ini_index.attr,
	&iscsi_boot_attr_ini_flags.attr,
	&iscsi_boot_attr_ini_isns.attr,
	&iscsi_boot_attr_ini_slp.attr,
	&iscsi_boot_attr_ini_primary_radius.attr,
	&iscsi_boot_attr_ini_secondary_radius.attr,
	&iscsi_boot_attr_ini_name.attr,
	NULL
	};

	static umode_t iscsi_boot_ini_attr_is_visible(struct kobject *kobj,
	struct attribute *attr, int i)
	{
	struct iscsi_boot_kobj *boot_kobj =
	container_of(kobj, struct iscsi_boot_kobj, kobj);

	if (attr == &iscsi_boot_attr_ini_index.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_INI_INDEX);
	if (attr == &iscsi_boot_attr_ini_flags.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_INI_FLAGS);
	if (attr == &iscsi_boot_attr_ini_isns.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_INI_ISNS_SERVER);
	if (attr == &iscsi_boot_attr_ini_slp.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_INI_SLP_SERVER);
	if (attr == &iscsi_boot_attr_ini_primary_radius.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_INI_PRI_RADIUS_SERVER);
	if (attr == &iscsi_boot_attr_ini_secondary_radius.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_INI_SEC_RADIUS_SERVER);
	if (attr == &iscsi_boot_attr_ini_name.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_INI_INITIATOR_NAME);

	return 0;
	}

	static struct attribute_group iscsi_boot_initiator_attr_group = {
	.attrs = initiator_attrs,
	.is_visible = iscsi_boot_ini_attr_is_visible,
	};

	/* iBFT ACPI Table attributes */
	iscsi_boot_rd_attr(acpitbl_signature, signature, ISCSI_BOOT_ACPITBL_SIGNATURE);
	iscsi_boot_rd_attr(acpitbl_oem_id, oem_id, ISCSI_BOOT_ACPITBL_OEM_ID);
	iscsi_boot_rd_attr(acpitbl_oem_table_id, oem_table_id,
	ISCSI_BOOT_ACPITBL_OEM_TABLE_ID);

	static struct attribute *acpitbl_attrs[] = {
	&iscsi_boot_attr_acpitbl_signature.attr,
	&iscsi_boot_attr_acpitbl_oem_id.attr,
	&iscsi_boot_attr_acpitbl_oem_table_id.attr,
	NULL
	};

	static umode_t iscsi_boot_acpitbl_attr_is_visible(struct kobject *kobj,
	struct attribute *attr, int i)
	{
	struct iscsi_boot_kobj *boot_kobj =
	container_of(kobj, struct iscsi_boot_kobj, kobj);

	if (attr == &iscsi_boot_attr_acpitbl_signature.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_ACPITBL_SIGNATURE);
	if (attr == &iscsi_boot_attr_acpitbl_oem_id.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_ACPITBL_OEM_ID);
	if (attr == &iscsi_boot_attr_acpitbl_oem_table_id.attr)
	return boot_kobj->is_visible(boot_kobj->data,
	ISCSI_BOOT_ACPITBL_OEM_TABLE_ID);
	return 0;
	}

	static struct attribute_group iscsi_boot_acpitbl_attr_group = {
	.attrs = acpitbl_attrs,
	.is_visible = iscsi_boot_acpitbl_attr_is_visible,
	};

	static struct iscsi_boot_kobj *
	iscsi_boot_create_kobj(struct iscsi_boot_kset *boot_kset,
	struct attribute_group *attr_group,
	const char name, int index, void data,
	ssize_t (show) (void data, int type, char *buf),
	umode_t (is_visible) (void data, int type),
	void (release) (void data))
	{
	struct iscsi_boot_kobj *boot_kobj;

	boot_kobj = kzalloc(sizeof(*boot_kobj), GFP_KERNEL);
	if (!boot_kobj)
	return NULL;
	INIT_LIST_HEAD(&boot_kobj->list);

	boot_kobj->kobj.kset = boot_kset->kset;
	if (kobject_init_and_add(&boot_kobj->kobj, &iscsi_boot_ktype,
	NULL, name, index)) {
	kfree(boot_kobj);
	return NULL;
	}
	boot_kobj->data = data;
	boot_kobj->show = show;
	boot_kobj->is_visible = is_visible;
	boot_kobj->release = release;

	if (sysfs_create_group(&boot_kobj->kobj, attr_group)) {
	/*
	* We do not want to free this because the caller
	* will assume that since the creation call failed
	* the boot kobj was not setup and the normal release
	* path is not being run.
	*/
	boot_kobj->release = NULL;
	kobject_put(&boot_kobj->kobj);
	return NULL;
	}
	boot_kobj->attr_group = attr_group;

	kobject_uevent(&boot_kobj->kobj, KOBJ_ADD);
	/* Nothing broke so lets add it to the list. */
	list_add_tail(&boot_kobj->list, &boot_kset->kobj_list);
	return boot_kobj;
	}

	static void iscsi_boot_remove_kobj(struct iscsi_boot_kobj *boot_kobj)
	{
	list_del(&boot_kobj->list);
	sysfs_remove_group(&boot_kobj->kobj, boot_kobj->attr_group);
	kobject_put(&boot_kobj->kobj);
	}

	/**
	* iscsi_boot_create_target() - create boot target sysfs dir
	* @boot_kset: boot kset
	* @index: the target id
	* @data: driver specific data for target
	* @show: attr show function
	* @is_visible: attr visibility function
	* @release: release function
	*
	* Note: The boot sysfs lib will free the data passed in for the caller
	* when all refs to the target kobject have been released.
	*/
	struct iscsi_boot_kobj *
	iscsi_boot_create_target(struct iscsi_boot_kset *boot_kset, int index,
	void *data,
	ssize_t (show) (void data, int type, char *buf),
	umode_t (is_visible) (void data, int type),
	void (release) (void data))
	{
	return iscsi_boot_create_kobj(boot_kset, &iscsi_boot_target_attr_group,
	"target%d", index, data, show, is_visible,
	release);
	}
	EXPORT_SYMBOL_GPL(iscsi_boot_create_target);

	/**
	* iscsi_boot_create_initiator() - create boot initiator sysfs dir
	* @boot_kset: boot kset
	* @index: the initiator id
	* @data: driver specific data
	* @show: attr show function
	* @is_visible: attr visibility function
	* @release: release function
	*
	* Note: The boot sysfs lib will free the data passed in for the caller
	* when all refs to the initiator kobject have been released.
	*/
	struct iscsi_boot_kobj *
	iscsi_boot_create_initiator(struct iscsi_boot_kset *boot_kset, int index,
	void *data,
	ssize_t (show) (void data, int type, char *buf),
	umode_t (is_visible) (void data, int type),
	void (release) (void data))
	{
	return iscsi_boot_create_kobj(boot_kset,
	&iscsi_boot_initiator_attr_group,
	"initiator", index, data, show,
	is_visible, release);
	}
	EXPORT_SYMBOL_GPL(iscsi_boot_create_initiator);

	/**
	* iscsi_boot_create_ethernet() - create boot ethernet sysfs dir
	* @boot_kset: boot kset
	* @index: the ethernet device id
	* @data: driver specific data
	* @show: attr show function
	* @is_visible: attr visibility function
	* @release: release function
	*
	* Note: The boot sysfs lib will free the data passed in for the caller
	* when all refs to the ethernet kobject have been released.
	*/
	struct iscsi_boot_kobj *
	iscsi_boot_create_ethernet(struct iscsi_boot_kset *boot_kset, int index,
	void *data,
	ssize_t (show) (void data, int type, char *buf),
	umode_t (is_visible) (void data, int type),
	void (release) (void data))
	{
	return iscsi_boot_create_kobj(boot_kset,
	&iscsi_boot_ethernet_attr_group,
	"ethernet%d", index, data, show,
	is_visible, release);
	}
	EXPORT_SYMBOL_GPL(iscsi_boot_create_ethernet);

	/**
	* iscsi_boot_create_acpitbl() - create boot acpi table sysfs dir
	* @boot_kset: boot kset
	* @index: not used
	* @data: driver specific data
	* @show: attr show function
	* @is_visible: attr visibility function
	* @release: release function
	*
	* Note: The boot sysfs lib will free the data passed in for the caller
	* when all refs to the acpitbl kobject have been released.
	*/
	struct iscsi_boot_kobj *
	iscsi_boot_create_acpitbl(struct iscsi_boot_kset *boot_kset, int index,
	void *data,
	ssize_t (show)(void data, int type, char *buf),
	umode_t (is_visible)(void data, int type),
	void (release)(void data))
	{
	return iscsi_boot_create_kobj(boot_kset,
	&iscsi_boot_acpitbl_attr_group,
	"acpi_header", index, data, show,
	is_visible, release);
	}
	EXPORT_SYMBOL_GPL(iscsi_boot_create_acpitbl);

	/**
	* iscsi_boot_create_kset() - creates root sysfs tree
	* @set_name: name of root dir
	*/
	struct iscsi_boot_kset iscsi_boot_create_kset(const char set_name)
	{
	struct iscsi_boot_kset *boot_kset;

	boot_kset = kzalloc(sizeof(*boot_kset), GFP_KERNEL);
	if (!boot_kset)
	return NULL;

	boot_kset->kset = kset_create_and_add(set_name, NULL, firmware_kobj);
	if (!boot_kset->kset) {
	kfree(boot_kset);
	return NULL;
	}

	INIT_LIST_HEAD(&boot_kset->kobj_list);
	return boot_kset;
	}
	EXPORT_SYMBOL_GPL(iscsi_boot_create_kset);

	/**
	* iscsi_boot_create_host_kset() - creates root sysfs tree for a scsi host
	* @hostno: host number of scsi host
	*/
	struct iscsi_boot_kset *iscsi_boot_create_host_kset(unsigned int hostno)
	{
	struct iscsi_boot_kset *boot_kset;
	char *set_name;

	set_name = kasprintf(GFP_KERNEL, "iscsi_boot%u", hostno);
	if (!set_name)
	return NULL;

	boot_kset = iscsi_boot_create_kset(set_name);
	kfree(set_name);
	return boot_kset;
	}
	EXPORT_SYMBOL_GPL(iscsi_boot_create_host_kset);

	/**
	* iscsi_boot_destroy_kset() - destroy kset and kobjects under it
	* @boot_kset: boot kset
	*
	* This will remove the kset and kobjects and attrs under it.
	*/
	void iscsi_boot_destroy_kset(struct iscsi_boot_kset *boot_kset)
	{
	struct iscsi_boot_kobj boot_kobj, tmp_kobj;

	if (!boot_kset)
	return;

	list_for_each_entry_safe(boot_kobj, tmp_kobj,
	&boot_kset->kobj_list, list)
	iscsi_boot_remove_kobj(boot_kobj);

	kset_unregister(boot_kset->kset);
	kfree(boot_kset);
	}
	EXPORT_SYMBOL_GPL(iscsi_boot_destroy_kset);