forked from Minki/linux
27f722ccbe
Maintaining tpg_list without ever iterating over it is not useful. Hence remove tpg_list. This patch does not change the behavior of the SCSI target code. Cc: Mike Christie <mchristie@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.de> Cc: Nicholas Bellinger <nab@linux-iscsi.org> Link: https://lore.kernel.org/r/20190930232224.58980-1-bvanassche@acm.org Signed-off-by: Bart Van Assche <bvanassche@acm.org> Reviewed-by: Mike Christie <mchristi@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
654 lines
17 KiB
C
654 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*******************************************************************************
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* Filename: target_core_tpg.c
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*
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* This file contains generic Target Portal Group related functions.
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*
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* (c) Copyright 2002-2013 Datera, Inc.
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*
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* Nicholas A. Bellinger <nab@kernel.org>
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*
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******************************************************************************/
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#include <linux/net.h>
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#include <linux/string.h>
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#include <linux/timer.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/in.h>
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#include <linux/export.h>
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#include <net/sock.h>
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#include <net/tcp.h>
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#include <scsi/scsi_proto.h>
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#include <target/target_core_base.h>
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#include <target/target_core_backend.h>
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#include <target/target_core_fabric.h>
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#include "target_core_internal.h"
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#include "target_core_alua.h"
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#include "target_core_pr.h"
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#include "target_core_ua.h"
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extern struct se_device *g_lun0_dev;
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/* __core_tpg_get_initiator_node_acl():
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*
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* mutex_lock(&tpg->acl_node_mutex); must be held when calling
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*/
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struct se_node_acl *__core_tpg_get_initiator_node_acl(
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struct se_portal_group *tpg,
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const char *initiatorname)
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{
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struct se_node_acl *acl;
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list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
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if (!strcmp(acl->initiatorname, initiatorname))
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return acl;
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}
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return NULL;
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}
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/* core_tpg_get_initiator_node_acl():
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*
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*
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*/
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struct se_node_acl *core_tpg_get_initiator_node_acl(
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struct se_portal_group *tpg,
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unsigned char *initiatorname)
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{
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struct se_node_acl *acl;
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/*
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* Obtain se_node_acl->acl_kref using fabric driver provided
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* initiatorname[] during node acl endpoint lookup driven by
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* new se_session login.
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*
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* The reference is held until se_session shutdown -> release
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* occurs via fabric driver invoked transport_deregister_session()
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* or transport_free_session() code.
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*/
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mutex_lock(&tpg->acl_node_mutex);
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acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
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if (acl) {
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if (!kref_get_unless_zero(&acl->acl_kref))
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acl = NULL;
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}
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mutex_unlock(&tpg->acl_node_mutex);
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return acl;
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}
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EXPORT_SYMBOL(core_tpg_get_initiator_node_acl);
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void core_allocate_nexus_loss_ua(
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struct se_node_acl *nacl)
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{
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struct se_dev_entry *deve;
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if (!nacl)
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return;
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rcu_read_lock();
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hlist_for_each_entry_rcu(deve, &nacl->lun_entry_hlist, link)
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core_scsi3_ua_allocate(deve, 0x29,
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ASCQ_29H_NEXUS_LOSS_OCCURRED);
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rcu_read_unlock();
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}
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EXPORT_SYMBOL(core_allocate_nexus_loss_ua);
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/* core_tpg_add_node_to_devs():
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*
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*
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*/
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void core_tpg_add_node_to_devs(
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struct se_node_acl *acl,
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struct se_portal_group *tpg,
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struct se_lun *lun_orig)
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{
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bool lun_access_ro = true;
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struct se_lun *lun;
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struct se_device *dev;
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mutex_lock(&tpg->tpg_lun_mutex);
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hlist_for_each_entry_rcu(lun, &tpg->tpg_lun_hlist, link) {
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if (lun_orig && lun != lun_orig)
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continue;
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dev = rcu_dereference_check(lun->lun_se_dev,
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lockdep_is_held(&tpg->tpg_lun_mutex));
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/*
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* By default in LIO-Target $FABRIC_MOD,
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* demo_mode_write_protect is ON, or READ_ONLY;
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*/
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if (!tpg->se_tpg_tfo->tpg_check_demo_mode_write_protect(tpg)) {
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lun_access_ro = false;
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} else {
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/*
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* Allow only optical drives to issue R/W in default RO
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* demo mode.
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*/
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if (dev->transport->get_device_type(dev) == TYPE_DISK)
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lun_access_ro = true;
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else
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lun_access_ro = false;
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}
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pr_debug("TARGET_CORE[%s]->TPG[%u]_LUN[%llu] - Adding %s"
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" access for LUN in Demo Mode\n",
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tpg->se_tpg_tfo->fabric_name,
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tpg->se_tpg_tfo->tpg_get_tag(tpg), lun->unpacked_lun,
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lun_access_ro ? "READ-ONLY" : "READ-WRITE");
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core_enable_device_list_for_node(lun, NULL, lun->unpacked_lun,
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lun_access_ro, acl, tpg);
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/*
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* Check to see if there are any existing persistent reservation
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* APTPL pre-registrations that need to be enabled for this dynamic
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* LUN ACL now..
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*/
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core_scsi3_check_aptpl_registration(dev, tpg, lun, acl,
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lun->unpacked_lun);
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}
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mutex_unlock(&tpg->tpg_lun_mutex);
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}
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static void
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target_set_nacl_queue_depth(struct se_portal_group *tpg,
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struct se_node_acl *acl, u32 queue_depth)
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{
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acl->queue_depth = queue_depth;
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if (!acl->queue_depth) {
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pr_warn("Queue depth for %s Initiator Node: %s is 0,"
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"defaulting to 1.\n", tpg->se_tpg_tfo->fabric_name,
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acl->initiatorname);
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acl->queue_depth = 1;
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}
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}
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static struct se_node_acl *target_alloc_node_acl(struct se_portal_group *tpg,
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const unsigned char *initiatorname)
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{
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struct se_node_acl *acl;
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u32 queue_depth;
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acl = kzalloc(max(sizeof(*acl), tpg->se_tpg_tfo->node_acl_size),
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GFP_KERNEL);
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if (!acl)
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return NULL;
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INIT_LIST_HEAD(&acl->acl_list);
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INIT_LIST_HEAD(&acl->acl_sess_list);
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INIT_HLIST_HEAD(&acl->lun_entry_hlist);
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kref_init(&acl->acl_kref);
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init_completion(&acl->acl_free_comp);
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spin_lock_init(&acl->nacl_sess_lock);
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mutex_init(&acl->lun_entry_mutex);
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atomic_set(&acl->acl_pr_ref_count, 0);
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if (tpg->se_tpg_tfo->tpg_get_default_depth)
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queue_depth = tpg->se_tpg_tfo->tpg_get_default_depth(tpg);
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else
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queue_depth = 1;
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target_set_nacl_queue_depth(tpg, acl, queue_depth);
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snprintf(acl->initiatorname, TRANSPORT_IQN_LEN, "%s", initiatorname);
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acl->se_tpg = tpg;
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acl->acl_index = scsi_get_new_index(SCSI_AUTH_INTR_INDEX);
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tpg->se_tpg_tfo->set_default_node_attributes(acl);
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return acl;
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}
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static void target_add_node_acl(struct se_node_acl *acl)
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{
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struct se_portal_group *tpg = acl->se_tpg;
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mutex_lock(&tpg->acl_node_mutex);
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list_add_tail(&acl->acl_list, &tpg->acl_node_list);
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mutex_unlock(&tpg->acl_node_mutex);
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pr_debug("%s_TPG[%hu] - Added %s ACL with TCQ Depth: %d for %s"
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" Initiator Node: %s\n",
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tpg->se_tpg_tfo->fabric_name,
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tpg->se_tpg_tfo->tpg_get_tag(tpg),
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acl->dynamic_node_acl ? "DYNAMIC" : "",
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acl->queue_depth,
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tpg->se_tpg_tfo->fabric_name,
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acl->initiatorname);
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}
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bool target_tpg_has_node_acl(struct se_portal_group *tpg,
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const char *initiatorname)
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{
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struct se_node_acl *acl;
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bool found = false;
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mutex_lock(&tpg->acl_node_mutex);
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list_for_each_entry(acl, &tpg->acl_node_list, acl_list) {
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if (!strcmp(acl->initiatorname, initiatorname)) {
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found = true;
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break;
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}
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}
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mutex_unlock(&tpg->acl_node_mutex);
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return found;
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}
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EXPORT_SYMBOL(target_tpg_has_node_acl);
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struct se_node_acl *core_tpg_check_initiator_node_acl(
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struct se_portal_group *tpg,
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unsigned char *initiatorname)
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{
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struct se_node_acl *acl;
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acl = core_tpg_get_initiator_node_acl(tpg, initiatorname);
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if (acl)
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return acl;
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if (!tpg->se_tpg_tfo->tpg_check_demo_mode(tpg))
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return NULL;
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acl = target_alloc_node_acl(tpg, initiatorname);
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if (!acl)
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return NULL;
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/*
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* When allocating a dynamically generated node_acl, go ahead
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* and take the extra kref now before returning to the fabric
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* driver caller.
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*
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* Note this reference will be released at session shutdown
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* time within transport_free_session() code.
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*/
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kref_get(&acl->acl_kref);
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acl->dynamic_node_acl = 1;
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/*
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* Here we only create demo-mode MappedLUNs from the active
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* TPG LUNs if the fabric is not explicitly asking for
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* tpg_check_demo_mode_login_only() == 1.
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*/
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if ((tpg->se_tpg_tfo->tpg_check_demo_mode_login_only == NULL) ||
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(tpg->se_tpg_tfo->tpg_check_demo_mode_login_only(tpg) != 1))
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core_tpg_add_node_to_devs(acl, tpg, NULL);
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target_add_node_acl(acl);
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return acl;
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}
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EXPORT_SYMBOL(core_tpg_check_initiator_node_acl);
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void core_tpg_wait_for_nacl_pr_ref(struct se_node_acl *nacl)
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{
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while (atomic_read(&nacl->acl_pr_ref_count) != 0)
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cpu_relax();
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}
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struct se_node_acl *core_tpg_add_initiator_node_acl(
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struct se_portal_group *tpg,
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const char *initiatorname)
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{
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struct se_node_acl *acl;
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mutex_lock(&tpg->acl_node_mutex);
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acl = __core_tpg_get_initiator_node_acl(tpg, initiatorname);
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if (acl) {
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if (acl->dynamic_node_acl) {
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acl->dynamic_node_acl = 0;
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pr_debug("%s_TPG[%u] - Replacing dynamic ACL"
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" for %s\n", tpg->se_tpg_tfo->fabric_name,
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tpg->se_tpg_tfo->tpg_get_tag(tpg), initiatorname);
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mutex_unlock(&tpg->acl_node_mutex);
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return acl;
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}
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pr_err("ACL entry for %s Initiator"
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" Node %s already exists for TPG %u, ignoring"
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" request.\n", tpg->se_tpg_tfo->fabric_name,
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initiatorname, tpg->se_tpg_tfo->tpg_get_tag(tpg));
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mutex_unlock(&tpg->acl_node_mutex);
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return ERR_PTR(-EEXIST);
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}
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mutex_unlock(&tpg->acl_node_mutex);
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acl = target_alloc_node_acl(tpg, initiatorname);
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if (!acl)
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return ERR_PTR(-ENOMEM);
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target_add_node_acl(acl);
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return acl;
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}
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static void target_shutdown_sessions(struct se_node_acl *acl)
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{
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struct se_session *sess;
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unsigned long flags;
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restart:
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spin_lock_irqsave(&acl->nacl_sess_lock, flags);
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list_for_each_entry(sess, &acl->acl_sess_list, sess_acl_list) {
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if (sess->sess_tearing_down)
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continue;
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list_del_init(&sess->sess_acl_list);
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spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
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if (acl->se_tpg->se_tpg_tfo->close_session)
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acl->se_tpg->se_tpg_tfo->close_session(sess);
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goto restart;
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}
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spin_unlock_irqrestore(&acl->nacl_sess_lock, flags);
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}
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void core_tpg_del_initiator_node_acl(struct se_node_acl *acl)
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{
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struct se_portal_group *tpg = acl->se_tpg;
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mutex_lock(&tpg->acl_node_mutex);
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if (acl->dynamic_node_acl)
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acl->dynamic_node_acl = 0;
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list_del_init(&acl->acl_list);
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mutex_unlock(&tpg->acl_node_mutex);
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target_shutdown_sessions(acl);
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target_put_nacl(acl);
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/*
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* Wait for last target_put_nacl() to complete in target_complete_nacl()
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* for active fabric session transport_deregister_session() callbacks.
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*/
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wait_for_completion(&acl->acl_free_comp);
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core_tpg_wait_for_nacl_pr_ref(acl);
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core_free_device_list_for_node(acl, tpg);
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pr_debug("%s_TPG[%hu] - Deleted ACL with TCQ Depth: %d for %s"
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" Initiator Node: %s\n", tpg->se_tpg_tfo->fabric_name,
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tpg->se_tpg_tfo->tpg_get_tag(tpg), acl->queue_depth,
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tpg->se_tpg_tfo->fabric_name, acl->initiatorname);
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kfree(acl);
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}
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/* core_tpg_set_initiator_node_queue_depth():
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*
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*
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*/
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int core_tpg_set_initiator_node_queue_depth(
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struct se_node_acl *acl,
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u32 queue_depth)
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{
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struct se_portal_group *tpg = acl->se_tpg;
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/*
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* Allow the setting of se_node_acl queue_depth to be idempotent,
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* and not force a session shutdown event if the value is not
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* changing.
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*/
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if (acl->queue_depth == queue_depth)
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return 0;
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/*
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* User has requested to change the queue depth for a Initiator Node.
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* Change the value in the Node's struct se_node_acl, and call
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* target_set_nacl_queue_depth() to set the new queue depth.
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*/
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target_set_nacl_queue_depth(tpg, acl, queue_depth);
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/*
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* Shutdown all pending sessions to force session reinstatement.
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*/
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target_shutdown_sessions(acl);
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pr_debug("Successfully changed queue depth to: %d for Initiator"
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" Node: %s on %s Target Portal Group: %u\n", acl->queue_depth,
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acl->initiatorname, tpg->se_tpg_tfo->fabric_name,
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tpg->se_tpg_tfo->tpg_get_tag(tpg));
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return 0;
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}
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EXPORT_SYMBOL(core_tpg_set_initiator_node_queue_depth);
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/* core_tpg_set_initiator_node_tag():
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*
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* Initiator nodeacl tags are not used internally, but may be used by
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* userspace to emulate aliases or groups.
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* Returns length of newly-set tag or -EINVAL.
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*/
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int core_tpg_set_initiator_node_tag(
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struct se_portal_group *tpg,
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struct se_node_acl *acl,
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const char *new_tag)
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{
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if (strlen(new_tag) >= MAX_ACL_TAG_SIZE)
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return -EINVAL;
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if (!strncmp("NULL", new_tag, 4)) {
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acl->acl_tag[0] = '\0';
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return 0;
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}
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return snprintf(acl->acl_tag, MAX_ACL_TAG_SIZE, "%s", new_tag);
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}
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EXPORT_SYMBOL(core_tpg_set_initiator_node_tag);
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static void core_tpg_lun_ref_release(struct percpu_ref *ref)
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{
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struct se_lun *lun = container_of(ref, struct se_lun, lun_ref);
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complete(&lun->lun_shutdown_comp);
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}
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/* Does not change se_wwn->priv. */
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int core_tpg_register(
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struct se_wwn *se_wwn,
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struct se_portal_group *se_tpg,
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int proto_id)
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{
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int ret;
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if (!se_tpg)
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return -EINVAL;
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/*
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* For the typical case where core_tpg_register() is called by a
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* fabric driver from target_core_fabric_ops->fabric_make_tpg()
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* configfs context, use the original tf_ops pointer already saved
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* by target-core in target_fabric_make_wwn().
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*
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* Otherwise, for special cases like iscsi-target discovery TPGs
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* the caller is responsible for setting ->se_tpg_tfo ahead of
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* calling core_tpg_register().
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*/
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if (se_wwn)
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se_tpg->se_tpg_tfo = se_wwn->wwn_tf->tf_ops;
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if (!se_tpg->se_tpg_tfo) {
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pr_err("Unable to locate se_tpg->se_tpg_tfo pointer\n");
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return -EINVAL;
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}
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INIT_HLIST_HEAD(&se_tpg->tpg_lun_hlist);
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se_tpg->proto_id = proto_id;
|
|
se_tpg->se_tpg_wwn = se_wwn;
|
|
atomic_set(&se_tpg->tpg_pr_ref_count, 0);
|
|
INIT_LIST_HEAD(&se_tpg->acl_node_list);
|
|
INIT_LIST_HEAD(&se_tpg->tpg_sess_list);
|
|
spin_lock_init(&se_tpg->session_lock);
|
|
mutex_init(&se_tpg->tpg_lun_mutex);
|
|
mutex_init(&se_tpg->acl_node_mutex);
|
|
|
|
if (se_tpg->proto_id >= 0) {
|
|
se_tpg->tpg_virt_lun0 = core_tpg_alloc_lun(se_tpg, 0);
|
|
if (IS_ERR(se_tpg->tpg_virt_lun0))
|
|
return PTR_ERR(se_tpg->tpg_virt_lun0);
|
|
|
|
ret = core_tpg_add_lun(se_tpg, se_tpg->tpg_virt_lun0,
|
|
true, g_lun0_dev);
|
|
if (ret < 0) {
|
|
kfree(se_tpg->tpg_virt_lun0);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
pr_debug("TARGET_CORE[%s]: Allocated portal_group for endpoint: %s, "
|
|
"Proto: %d, Portal Tag: %u\n", se_tpg->se_tpg_tfo->fabric_name,
|
|
se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg) ?
|
|
se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg) : NULL,
|
|
se_tpg->proto_id, se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(core_tpg_register);
|
|
|
|
int core_tpg_deregister(struct se_portal_group *se_tpg)
|
|
{
|
|
const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo;
|
|
struct se_node_acl *nacl, *nacl_tmp;
|
|
LIST_HEAD(node_list);
|
|
|
|
pr_debug("TARGET_CORE[%s]: Deallocating portal_group for endpoint: %s, "
|
|
"Proto: %d, Portal Tag: %u\n", tfo->fabric_name,
|
|
tfo->tpg_get_wwn(se_tpg) ? tfo->tpg_get_wwn(se_tpg) : NULL,
|
|
se_tpg->proto_id, tfo->tpg_get_tag(se_tpg));
|
|
|
|
while (atomic_read(&se_tpg->tpg_pr_ref_count) != 0)
|
|
cpu_relax();
|
|
|
|
mutex_lock(&se_tpg->acl_node_mutex);
|
|
list_splice_init(&se_tpg->acl_node_list, &node_list);
|
|
mutex_unlock(&se_tpg->acl_node_mutex);
|
|
/*
|
|
* Release any remaining demo-mode generated se_node_acl that have
|
|
* not been released because of TFO->tpg_check_demo_mode_cache() == 1
|
|
* in transport_deregister_session().
|
|
*/
|
|
list_for_each_entry_safe(nacl, nacl_tmp, &node_list, acl_list) {
|
|
list_del_init(&nacl->acl_list);
|
|
|
|
core_tpg_wait_for_nacl_pr_ref(nacl);
|
|
core_free_device_list_for_node(nacl, se_tpg);
|
|
kfree(nacl);
|
|
}
|
|
|
|
if (se_tpg->proto_id >= 0) {
|
|
core_tpg_remove_lun(se_tpg, se_tpg->tpg_virt_lun0);
|
|
kfree_rcu(se_tpg->tpg_virt_lun0, rcu_head);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(core_tpg_deregister);
|
|
|
|
struct se_lun *core_tpg_alloc_lun(
|
|
struct se_portal_group *tpg,
|
|
u64 unpacked_lun)
|
|
{
|
|
struct se_lun *lun;
|
|
|
|
lun = kzalloc(sizeof(*lun), GFP_KERNEL);
|
|
if (!lun) {
|
|
pr_err("Unable to allocate se_lun memory\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
lun->unpacked_lun = unpacked_lun;
|
|
atomic_set(&lun->lun_acl_count, 0);
|
|
init_completion(&lun->lun_shutdown_comp);
|
|
INIT_LIST_HEAD(&lun->lun_deve_list);
|
|
INIT_LIST_HEAD(&lun->lun_dev_link);
|
|
atomic_set(&lun->lun_tg_pt_secondary_offline, 0);
|
|
spin_lock_init(&lun->lun_deve_lock);
|
|
mutex_init(&lun->lun_tg_pt_md_mutex);
|
|
INIT_LIST_HEAD(&lun->lun_tg_pt_gp_link);
|
|
spin_lock_init(&lun->lun_tg_pt_gp_lock);
|
|
lun->lun_tpg = tpg;
|
|
|
|
return lun;
|
|
}
|
|
|
|
int core_tpg_add_lun(
|
|
struct se_portal_group *tpg,
|
|
struct se_lun *lun,
|
|
bool lun_access_ro,
|
|
struct se_device *dev)
|
|
{
|
|
int ret;
|
|
|
|
ret = percpu_ref_init(&lun->lun_ref, core_tpg_lun_ref_release, 0,
|
|
GFP_KERNEL);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = core_alloc_rtpi(lun, dev);
|
|
if (ret)
|
|
goto out_kill_ref;
|
|
|
|
if (!(dev->transport->transport_flags &
|
|
TRANSPORT_FLAG_PASSTHROUGH_ALUA) &&
|
|
!(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
|
|
target_attach_tg_pt_gp(lun, dev->t10_alua.default_tg_pt_gp);
|
|
|
|
mutex_lock(&tpg->tpg_lun_mutex);
|
|
|
|
spin_lock(&dev->se_port_lock);
|
|
lun->lun_index = dev->dev_index;
|
|
rcu_assign_pointer(lun->lun_se_dev, dev);
|
|
dev->export_count++;
|
|
list_add_tail(&lun->lun_dev_link, &dev->dev_sep_list);
|
|
spin_unlock(&dev->se_port_lock);
|
|
|
|
if (dev->dev_flags & DF_READ_ONLY)
|
|
lun->lun_access_ro = true;
|
|
else
|
|
lun->lun_access_ro = lun_access_ro;
|
|
if (!(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
|
|
hlist_add_head_rcu(&lun->link, &tpg->tpg_lun_hlist);
|
|
mutex_unlock(&tpg->tpg_lun_mutex);
|
|
|
|
return 0;
|
|
|
|
out_kill_ref:
|
|
percpu_ref_exit(&lun->lun_ref);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
void core_tpg_remove_lun(
|
|
struct se_portal_group *tpg,
|
|
struct se_lun *lun)
|
|
{
|
|
/*
|
|
* rcu_dereference_raw protected by se_lun->lun_group symlink
|
|
* reference to se_device->dev_group.
|
|
*/
|
|
struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
|
|
|
|
lun->lun_shutdown = true;
|
|
|
|
core_clear_lun_from_tpg(lun, tpg);
|
|
/*
|
|
* Wait for any active I/O references to percpu se_lun->lun_ref to
|
|
* be released. Also, se_lun->lun_ref is now used by PR and ALUA
|
|
* logic when referencing a remote target port during ALL_TGT_PT=1
|
|
* and generating UNIT_ATTENTIONs for ALUA access state transition.
|
|
*/
|
|
transport_clear_lun_ref(lun);
|
|
|
|
mutex_lock(&tpg->tpg_lun_mutex);
|
|
if (lun->lun_se_dev) {
|
|
target_detach_tg_pt_gp(lun);
|
|
|
|
spin_lock(&dev->se_port_lock);
|
|
list_del(&lun->lun_dev_link);
|
|
dev->export_count--;
|
|
rcu_assign_pointer(lun->lun_se_dev, NULL);
|
|
spin_unlock(&dev->se_port_lock);
|
|
}
|
|
if (!(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
|
|
hlist_del_rcu(&lun->link);
|
|
|
|
lun->lun_shutdown = false;
|
|
mutex_unlock(&tpg->tpg_lun_mutex);
|
|
|
|
percpu_ref_exit(&lun->lun_ref);
|
|
}
|