4104 строки
122 KiB
C
4104 строки
122 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*******************************************************************************
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* Filename: target_core_pr.c
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*
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* This file contains SPC-3 compliant persistent reservations and
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* legacy SPC-2 reservations with compatible reservation handling (CRH=1)
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*
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* (c) Copyright 2009-2013 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/slab.h>
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#include <linux/spinlock.h>
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#include <linux/list.h>
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#include <linux/vmalloc.h>
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#include <linux/file.h>
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#include <linux/fcntl.h>
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#include <linux/fs.h>
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#include <scsi/scsi_proto.h>
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#include <asm/unaligned.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_pr.h"
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#include "target_core_ua.h"
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/*
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* Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)
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*/
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struct pr_transport_id_holder {
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struct t10_pr_registration *dest_pr_reg;
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struct se_portal_group *dest_tpg;
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struct se_node_acl *dest_node_acl;
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struct se_dev_entry *dest_se_deve;
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struct list_head dest_list;
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};
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void core_pr_dump_initiator_port(
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struct t10_pr_registration *pr_reg,
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char *buf,
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u32 size)
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{
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if (!pr_reg->isid_present_at_reg) {
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buf[0] = '\0';
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return;
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}
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snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid);
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}
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enum register_type {
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REGISTER,
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REGISTER_AND_IGNORE_EXISTING_KEY,
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REGISTER_AND_MOVE,
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};
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enum preempt_type {
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PREEMPT,
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PREEMPT_AND_ABORT,
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};
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static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
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struct t10_pr_registration *, int, int);
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static int is_reservation_holder(
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struct t10_pr_registration *pr_res_holder,
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struct t10_pr_registration *pr_reg)
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{
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int pr_res_type;
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if (pr_res_holder) {
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pr_res_type = pr_res_holder->pr_res_type;
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return pr_res_holder == pr_reg ||
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pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
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pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG;
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}
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return 0;
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}
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static sense_reason_t
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target_scsi2_reservation_check(struct se_cmd *cmd)
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{
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struct se_device *dev = cmd->se_dev;
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struct se_session *sess = cmd->se_sess;
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switch (cmd->t_task_cdb[0]) {
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case INQUIRY:
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case RELEASE:
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case RELEASE_10:
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return 0;
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default:
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break;
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}
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if (!dev->reservation_holder || !sess)
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return 0;
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if (dev->reservation_holder->se_node_acl != sess->se_node_acl)
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return TCM_RESERVATION_CONFLICT;
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if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
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if (dev->dev_res_bin_isid != sess->sess_bin_isid)
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return TCM_RESERVATION_CONFLICT;
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}
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return 0;
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}
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static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
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struct se_node_acl *, struct se_session *);
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static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
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static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd)
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{
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struct se_session *se_sess = cmd->se_sess;
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struct se_device *dev = cmd->se_dev;
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struct t10_pr_registration *pr_reg;
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struct t10_reservation *pr_tmpl = &dev->t10_pr;
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int conflict = 0;
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pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
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se_sess);
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if (pr_reg) {
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/*
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* From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
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* behavior
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*
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* A RESERVE(6) or RESERVE(10) command shall complete with GOOD
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* status, but no reservation shall be established and the
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* persistent reservation shall not be changed, if the command
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* is received from a) and b) below.
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*
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* A RELEASE(6) or RELEASE(10) command shall complete with GOOD
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* status, but the persistent reservation shall not be released,
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* if the command is received from a) and b)
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*
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* a) An I_T nexus that is a persistent reservation holder; or
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* b) An I_T nexus that is registered if a registrants only or
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* all registrants type persistent reservation is present.
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*
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* In all other cases, a RESERVE(6) command, RESERVE(10) command,
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* RELEASE(6) command, or RELEASE(10) command shall be processed
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* as defined in SPC-2.
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*/
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if (pr_reg->pr_res_holder) {
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core_scsi3_put_pr_reg(pr_reg);
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return 1;
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}
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if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
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(pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
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(pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
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(pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
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core_scsi3_put_pr_reg(pr_reg);
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return 1;
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}
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core_scsi3_put_pr_reg(pr_reg);
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conflict = 1;
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} else {
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/*
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* Following spc2r20 5.5.1 Reservations overview:
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*
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* If a logical unit has executed a PERSISTENT RESERVE OUT
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* command with the REGISTER or the REGISTER AND IGNORE
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* EXISTING KEY service action and is still registered by any
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* initiator, all RESERVE commands and all RELEASE commands
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* regardless of initiator shall conflict and shall terminate
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* with a RESERVATION CONFLICT status.
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*/
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spin_lock(&pr_tmpl->registration_lock);
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conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
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spin_unlock(&pr_tmpl->registration_lock);
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}
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if (conflict) {
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pr_err("Received legacy SPC-2 RESERVE/RELEASE"
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" while active SPC-3 registrations exist,"
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" returning RESERVATION_CONFLICT\n");
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return -EBUSY;
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}
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return 0;
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}
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void target_release_reservation(struct se_device *dev)
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{
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dev->reservation_holder = NULL;
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dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS;
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if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
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dev->dev_res_bin_isid = 0;
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dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID;
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}
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}
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sense_reason_t
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target_scsi2_reservation_release(struct se_cmd *cmd)
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{
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struct se_device *dev = cmd->se_dev;
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struct se_session *sess = cmd->se_sess;
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struct se_portal_group *tpg;
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int rc;
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if (!sess || !sess->se_tpg)
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goto out;
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rc = target_check_scsi2_reservation_conflict(cmd);
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if (rc == 1)
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goto out;
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if (rc < 0)
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return TCM_RESERVATION_CONFLICT;
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spin_lock(&dev->dev_reservation_lock);
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if (!dev->reservation_holder || !sess)
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goto out_unlock;
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if (dev->reservation_holder->se_node_acl != sess->se_node_acl)
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goto out_unlock;
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if (dev->dev_res_bin_isid != sess->sess_bin_isid)
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goto out_unlock;
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target_release_reservation(dev);
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tpg = sess->se_tpg;
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pr_debug("SCSI-2 Released reservation for %s LUN: %llu ->"
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" MAPPED LUN: %llu for %s\n",
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tpg->se_tpg_tfo->fabric_name,
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cmd->se_lun->unpacked_lun, cmd->orig_fe_lun,
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sess->se_node_acl->initiatorname);
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out_unlock:
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spin_unlock(&dev->dev_reservation_lock);
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out:
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target_complete_cmd(cmd, GOOD);
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return 0;
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}
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sense_reason_t
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target_scsi2_reservation_reserve(struct se_cmd *cmd)
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{
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struct se_device *dev = cmd->se_dev;
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struct se_session *sess = cmd->se_sess;
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struct se_portal_group *tpg;
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sense_reason_t ret = 0;
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int rc;
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if ((cmd->t_task_cdb[1] & 0x01) &&
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(cmd->t_task_cdb[1] & 0x02)) {
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pr_err("LongIO and Obsolete Bits set, returning ILLEGAL_REQUEST\n");
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return TCM_UNSUPPORTED_SCSI_OPCODE;
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}
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/*
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* This is currently the case for target_core_mod passthrough struct se_cmd
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* ops
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*/
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if (!sess || !sess->se_tpg)
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goto out;
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rc = target_check_scsi2_reservation_conflict(cmd);
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if (rc == 1)
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goto out;
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if (rc < 0)
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return TCM_RESERVATION_CONFLICT;
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tpg = sess->se_tpg;
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spin_lock(&dev->dev_reservation_lock);
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if (dev->reservation_holder &&
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dev->reservation_holder->se_node_acl != sess->se_node_acl) {
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pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
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tpg->se_tpg_tfo->fabric_name);
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pr_err("Original reserver LUN: %llu %s\n",
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cmd->se_lun->unpacked_lun,
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dev->reservation_holder->se_node_acl->initiatorname);
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pr_err("Current attempt - LUN: %llu -> MAPPED LUN: %llu"
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" from %s \n", cmd->se_lun->unpacked_lun,
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cmd->orig_fe_lun,
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sess->se_node_acl->initiatorname);
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ret = TCM_RESERVATION_CONFLICT;
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goto out_unlock;
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}
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dev->reservation_holder = sess;
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dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS;
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if (sess->sess_bin_isid != 0) {
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dev->dev_res_bin_isid = sess->sess_bin_isid;
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dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID;
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}
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pr_debug("SCSI-2 Reserved %s LUN: %llu -> MAPPED LUN: %llu"
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" for %s\n", tpg->se_tpg_tfo->fabric_name,
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cmd->se_lun->unpacked_lun, cmd->orig_fe_lun,
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sess->se_node_acl->initiatorname);
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out_unlock:
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spin_unlock(&dev->dev_reservation_lock);
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out:
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if (!ret)
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target_complete_cmd(cmd, GOOD);
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return ret;
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}
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/*
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* Begin SPC-3/SPC-4 Persistent Reservations emulation support
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*
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* This function is called by those initiator ports who are *NOT*
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* the active PR reservation holder when a reservation is present.
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*/
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static int core_scsi3_pr_seq_non_holder(struct se_cmd *cmd, u32 pr_reg_type,
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bool isid_mismatch)
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{
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unsigned char *cdb = cmd->t_task_cdb;
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struct se_session *se_sess = cmd->se_sess;
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struct se_node_acl *nacl = se_sess->se_node_acl;
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int other_cdb = 0;
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int registered_nexus = 0, ret = 1; /* Conflict by default */
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int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
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int we = 0; /* Write Exclusive */
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int legacy = 0; /* Act like a legacy device and return
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* RESERVATION CONFLICT on some CDBs */
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if (isid_mismatch) {
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registered_nexus = 0;
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} else {
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struct se_dev_entry *se_deve;
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rcu_read_lock();
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se_deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun);
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if (se_deve)
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registered_nexus = test_bit(DEF_PR_REG_ACTIVE,
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&se_deve->deve_flags);
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rcu_read_unlock();
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}
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switch (pr_reg_type) {
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case PR_TYPE_WRITE_EXCLUSIVE:
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we = 1;
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fallthrough;
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case PR_TYPE_EXCLUSIVE_ACCESS:
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/*
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* Some commands are only allowed for the persistent reservation
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* holder.
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*/
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break;
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case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
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we = 1;
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fallthrough;
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case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
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/*
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* Some commands are only allowed for registered I_T Nexuses.
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*/
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reg_only = 1;
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break;
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case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
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we = 1;
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fallthrough;
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case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
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/*
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* Each registered I_T Nexus is a reservation holder.
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*/
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all_reg = 1;
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break;
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default:
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return -EINVAL;
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}
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/*
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* Referenced from spc4r17 table 45 for *NON* PR holder access
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*/
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switch (cdb[0]) {
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case SECURITY_PROTOCOL_IN:
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if (registered_nexus)
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return 0;
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ret = (we) ? 0 : 1;
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break;
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case MODE_SENSE:
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case MODE_SENSE_10:
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case READ_ATTRIBUTE:
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case READ_BUFFER:
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case RECEIVE_DIAGNOSTIC:
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if (legacy) {
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ret = 1;
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break;
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}
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if (registered_nexus) {
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ret = 0;
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break;
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}
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ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
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break;
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case PERSISTENT_RESERVE_OUT:
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/*
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* This follows PERSISTENT_RESERVE_OUT service actions that
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* are allowed in the presence of various reservations.
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* See spc4r17, table 46
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*/
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switch (cdb[1] & 0x1f) {
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case PRO_CLEAR:
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case PRO_PREEMPT:
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case PRO_PREEMPT_AND_ABORT:
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ret = (registered_nexus) ? 0 : 1;
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break;
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case PRO_REGISTER:
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case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
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ret = 0;
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break;
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case PRO_REGISTER_AND_MOVE:
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case PRO_RESERVE:
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ret = 1;
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break;
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case PRO_RELEASE:
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ret = (registered_nexus) ? 0 : 1;
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break;
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default:
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pr_err("Unknown PERSISTENT_RESERVE_OUT service"
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" action: 0x%02x\n", cdb[1] & 0x1f);
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return -EINVAL;
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}
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break;
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case RELEASE:
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case RELEASE_10:
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/* Handled by CRH=1 in target_scsi2_reservation_release() */
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ret = 0;
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break;
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case RESERVE:
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case RESERVE_10:
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/* Handled by CRH=1 in target_scsi2_reservation_reserve() */
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ret = 0;
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break;
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case TEST_UNIT_READY:
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ret = (legacy) ? 1 : 0; /* Conflict for legacy */
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break;
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case MAINTENANCE_IN:
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switch (cdb[1] & 0x1f) {
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case MI_MANAGEMENT_PROTOCOL_IN:
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if (registered_nexus) {
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ret = 0;
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break;
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}
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ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
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break;
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case MI_REPORT_SUPPORTED_OPERATION_CODES:
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case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
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if (legacy) {
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ret = 1;
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break;
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}
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if (registered_nexus) {
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ret = 0;
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break;
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}
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ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
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break;
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case MI_REPORT_ALIASES:
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case MI_REPORT_IDENTIFYING_INFORMATION:
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case MI_REPORT_PRIORITY:
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case MI_REPORT_TARGET_PGS:
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case MI_REPORT_TIMESTAMP:
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ret = 0; /* Allowed */
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break;
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default:
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pr_err("Unknown MI Service Action: 0x%02x\n",
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(cdb[1] & 0x1f));
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return -EINVAL;
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}
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break;
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case ACCESS_CONTROL_IN:
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case ACCESS_CONTROL_OUT:
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case INQUIRY:
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case LOG_SENSE:
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case SERVICE_ACTION_IN_12:
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case REPORT_LUNS:
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case REQUEST_SENSE:
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case PERSISTENT_RESERVE_IN:
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ret = 0; /*/ Allowed CDBs */
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break;
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default:
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other_cdb = 1;
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break;
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||
}
|
||
/*
|
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* Case where the CDB is explicitly allowed in the above switch
|
||
* statement.
|
||
*/
|
||
if (!ret && !other_cdb) {
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pr_debug("Allowing explicit CDB: 0x%02x for %s"
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||
" reservation holder\n", cdb[0],
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core_scsi3_pr_dump_type(pr_reg_type));
|
||
|
||
return ret;
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||
}
|
||
/*
|
||
* Check if write exclusive initiator ports *NOT* holding the
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||
* WRITE_EXCLUSIVE_* reservation.
|
||
*/
|
||
if (we && !registered_nexus) {
|
||
if (cmd->data_direction == DMA_TO_DEVICE) {
|
||
/*
|
||
* Conflict for write exclusive
|
||
*/
|
||
pr_debug("%s Conflict for unregistered nexus"
|
||
" %s CDB: 0x%02x to %s reservation\n",
|
||
transport_dump_cmd_direction(cmd),
|
||
se_sess->se_node_acl->initiatorname, cdb[0],
|
||
core_scsi3_pr_dump_type(pr_reg_type));
|
||
return 1;
|
||
} else {
|
||
/*
|
||
* Allow non WRITE CDBs for all Write Exclusive
|
||
* PR TYPEs to pass for registered and
|
||
* non-registered_nexuxes NOT holding the reservation.
|
||
*
|
||
* We only make noise for the unregisterd nexuses,
|
||
* as we expect registered non-reservation holding
|
||
* nexuses to issue CDBs.
|
||
*/
|
||
|
||
if (!registered_nexus) {
|
||
pr_debug("Allowing implicit CDB: 0x%02x"
|
||
" for %s reservation on unregistered"
|
||
" nexus\n", cdb[0],
|
||
core_scsi3_pr_dump_type(pr_reg_type));
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
} else if ((reg_only) || (all_reg)) {
|
||
if (registered_nexus) {
|
||
/*
|
||
* For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
|
||
* allow commands from registered nexuses.
|
||
*/
|
||
|
||
pr_debug("Allowing implicit CDB: 0x%02x for %s"
|
||
" reservation\n", cdb[0],
|
||
core_scsi3_pr_dump_type(pr_reg_type));
|
||
|
||
return 0;
|
||
}
|
||
} else if (we && registered_nexus) {
|
||
/*
|
||
* Reads are allowed for Write Exclusive locks
|
||
* from all registrants.
|
||
*/
|
||
if (cmd->data_direction == DMA_FROM_DEVICE) {
|
||
pr_debug("Allowing READ CDB: 0x%02x for %s"
|
||
" reservation\n", cdb[0],
|
||
core_scsi3_pr_dump_type(pr_reg_type));
|
||
|
||
return 0;
|
||
}
|
||
}
|
||
pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
|
||
" for %s reservation\n", transport_dump_cmd_direction(cmd),
|
||
(registered_nexus) ? "" : "un",
|
||
se_sess->se_node_acl->initiatorname, cdb[0],
|
||
core_scsi3_pr_dump_type(pr_reg_type));
|
||
|
||
return 1; /* Conflict by default */
|
||
}
|
||
|
||
static sense_reason_t
|
||
target_scsi3_pr_reservation_check(struct se_cmd *cmd)
|
||
{
|
||
struct se_device *dev = cmd->se_dev;
|
||
struct se_session *sess = cmd->se_sess;
|
||
u32 pr_reg_type;
|
||
bool isid_mismatch = false;
|
||
|
||
if (!dev->dev_pr_res_holder)
|
||
return 0;
|
||
|
||
pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
|
||
cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
|
||
if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl)
|
||
goto check_nonholder;
|
||
|
||
if (dev->dev_pr_res_holder->isid_present_at_reg) {
|
||
if (dev->dev_pr_res_holder->pr_reg_bin_isid !=
|
||
sess->sess_bin_isid) {
|
||
isid_mismatch = true;
|
||
goto check_nonholder;
|
||
}
|
||
}
|
||
|
||
return 0;
|
||
|
||
check_nonholder:
|
||
if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type, isid_mismatch))
|
||
return TCM_RESERVATION_CONFLICT;
|
||
return 0;
|
||
}
|
||
|
||
static u32 core_scsi3_pr_generation(struct se_device *dev)
|
||
{
|
||
u32 prg;
|
||
|
||
/*
|
||
* PRGeneration field shall contain the value of a 32-bit wrapping
|
||
* counter mainted by the device server.
|
||
*
|
||
* Note that this is done regardless of Active Persist across
|
||
* Target PowerLoss (APTPL)
|
||
*
|
||
* See spc4r17 section 6.3.12 READ_KEYS service action
|
||
*/
|
||
spin_lock(&dev->dev_reservation_lock);
|
||
prg = dev->t10_pr.pr_generation++;
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
|
||
return prg;
|
||
}
|
||
|
||
static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
|
||
struct se_device *dev,
|
||
struct se_node_acl *nacl,
|
||
struct se_lun *lun,
|
||
struct se_dev_entry *dest_deve,
|
||
u64 mapped_lun,
|
||
unsigned char *isid,
|
||
u64 sa_res_key,
|
||
int all_tg_pt,
|
||
int aptpl)
|
||
{
|
||
struct t10_pr_registration *pr_reg;
|
||
|
||
pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
|
||
if (!pr_reg) {
|
||
pr_err("Unable to allocate struct t10_pr_registration\n");
|
||
return NULL;
|
||
}
|
||
|
||
INIT_LIST_HEAD(&pr_reg->pr_reg_list);
|
||
INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
|
||
INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
|
||
INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
|
||
INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
|
||
atomic_set(&pr_reg->pr_res_holders, 0);
|
||
pr_reg->pr_reg_nacl = nacl;
|
||
/*
|
||
* For destination registrations for ALL_TG_PT=1 and SPEC_I_PT=1,
|
||
* the se_dev_entry->pr_ref will have been already obtained by
|
||
* core_get_se_deve_from_rtpi() or __core_scsi3_alloc_registration().
|
||
*
|
||
* Otherwise, locate se_dev_entry now and obtain a reference until
|
||
* registration completes in __core_scsi3_add_registration().
|
||
*/
|
||
if (dest_deve) {
|
||
pr_reg->pr_reg_deve = dest_deve;
|
||
} else {
|
||
rcu_read_lock();
|
||
pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun);
|
||
if (!pr_reg->pr_reg_deve) {
|
||
rcu_read_unlock();
|
||
pr_err("Unable to locate PR deve %s mapped_lun: %llu\n",
|
||
nacl->initiatorname, mapped_lun);
|
||
kmem_cache_free(t10_pr_reg_cache, pr_reg);
|
||
return NULL;
|
||
}
|
||
kref_get(&pr_reg->pr_reg_deve->pr_kref);
|
||
rcu_read_unlock();
|
||
}
|
||
pr_reg->pr_res_mapped_lun = mapped_lun;
|
||
pr_reg->pr_aptpl_target_lun = lun->unpacked_lun;
|
||
pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi;
|
||
pr_reg->pr_res_key = sa_res_key;
|
||
pr_reg->pr_reg_all_tg_pt = all_tg_pt;
|
||
pr_reg->pr_reg_aptpl = aptpl;
|
||
/*
|
||
* If an ISID value for this SCSI Initiator Port exists,
|
||
* save it to the registration now.
|
||
*/
|
||
if (isid != NULL) {
|
||
pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
|
||
snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
|
||
pr_reg->isid_present_at_reg = 1;
|
||
}
|
||
|
||
return pr_reg;
|
||
}
|
||
|
||
static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
|
||
static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
|
||
|
||
/*
|
||
* Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
|
||
* modes.
|
||
*/
|
||
static struct t10_pr_registration *__core_scsi3_alloc_registration(
|
||
struct se_device *dev,
|
||
struct se_node_acl *nacl,
|
||
struct se_lun *lun,
|
||
struct se_dev_entry *deve,
|
||
u64 mapped_lun,
|
||
unsigned char *isid,
|
||
u64 sa_res_key,
|
||
int all_tg_pt,
|
||
int aptpl)
|
||
{
|
||
struct se_dev_entry *deve_tmp;
|
||
struct se_node_acl *nacl_tmp;
|
||
struct se_lun_acl *lacl_tmp;
|
||
struct se_lun *lun_tmp, *next, *dest_lun;
|
||
const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
|
||
struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
|
||
int ret;
|
||
/*
|
||
* Create a registration for the I_T Nexus upon which the
|
||
* PROUT REGISTER was received.
|
||
*/
|
||
pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, lun, deve, mapped_lun,
|
||
isid, sa_res_key, all_tg_pt,
|
||
aptpl);
|
||
if (!pr_reg)
|
||
return NULL;
|
||
/*
|
||
* Return pointer to pr_reg for ALL_TG_PT=0
|
||
*/
|
||
if (!all_tg_pt)
|
||
return pr_reg;
|
||
/*
|
||
* Create list of matching SCSI Initiator Port registrations
|
||
* for ALL_TG_PT=1
|
||
*/
|
||
spin_lock(&dev->se_port_lock);
|
||
list_for_each_entry_safe(lun_tmp, next, &dev->dev_sep_list, lun_dev_link) {
|
||
if (!percpu_ref_tryget_live(&lun_tmp->lun_ref))
|
||
continue;
|
||
spin_unlock(&dev->se_port_lock);
|
||
|
||
spin_lock(&lun_tmp->lun_deve_lock);
|
||
list_for_each_entry(deve_tmp, &lun_tmp->lun_deve_list, lun_link) {
|
||
/*
|
||
* This pointer will be NULL for demo mode MappedLUNs
|
||
* that have not been make explicit via a ConfigFS
|
||
* MappedLUN group for the SCSI Initiator Node ACL.
|
||
*/
|
||
if (!deve_tmp->se_lun_acl)
|
||
continue;
|
||
|
||
lacl_tmp = rcu_dereference_check(deve_tmp->se_lun_acl,
|
||
lockdep_is_held(&lun_tmp->lun_deve_lock));
|
||
nacl_tmp = lacl_tmp->se_lun_nacl;
|
||
/*
|
||
* Skip the matching struct se_node_acl that is allocated
|
||
* above..
|
||
*/
|
||
if (nacl == nacl_tmp)
|
||
continue;
|
||
/*
|
||
* Only perform PR registrations for target ports on
|
||
* the same fabric module as the REGISTER w/ ALL_TG_PT=1
|
||
* arrived.
|
||
*/
|
||
if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
|
||
continue;
|
||
/*
|
||
* Look for a matching Initiator Node ACL in ASCII format
|
||
*/
|
||
if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
|
||
continue;
|
||
|
||
kref_get(&deve_tmp->pr_kref);
|
||
spin_unlock(&lun_tmp->lun_deve_lock);
|
||
/*
|
||
* Grab a configfs group dependency that is released
|
||
* for the exception path at label out: below, or upon
|
||
* completion of adding ALL_TG_PT=1 registrations in
|
||
* __core_scsi3_add_registration()
|
||
*/
|
||
ret = core_scsi3_lunacl_depend_item(deve_tmp);
|
||
if (ret < 0) {
|
||
pr_err("core_scsi3_lunacl_depend"
|
||
"_item() failed\n");
|
||
percpu_ref_put(&lun_tmp->lun_ref);
|
||
kref_put(&deve_tmp->pr_kref, target_pr_kref_release);
|
||
goto out;
|
||
}
|
||
/*
|
||
* Located a matching SCSI Initiator Port on a different
|
||
* port, allocate the pr_reg_atp and attach it to the
|
||
* pr_reg->pr_reg_atp_list that will be processed once
|
||
* the original *pr_reg is processed in
|
||
* __core_scsi3_add_registration()
|
||
*/
|
||
dest_lun = rcu_dereference_check(deve_tmp->se_lun,
|
||
kref_read(&deve_tmp->pr_kref) != 0);
|
||
|
||
pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
|
||
nacl_tmp, dest_lun, deve_tmp,
|
||
deve_tmp->mapped_lun, NULL,
|
||
sa_res_key, all_tg_pt, aptpl);
|
||
if (!pr_reg_atp) {
|
||
percpu_ref_put(&lun_tmp->lun_ref);
|
||
core_scsi3_lunacl_undepend_item(deve_tmp);
|
||
goto out;
|
||
}
|
||
|
||
list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
|
||
&pr_reg->pr_reg_atp_list);
|
||
spin_lock(&lun_tmp->lun_deve_lock);
|
||
}
|
||
spin_unlock(&lun_tmp->lun_deve_lock);
|
||
|
||
spin_lock(&dev->se_port_lock);
|
||
percpu_ref_put(&lun_tmp->lun_ref);
|
||
}
|
||
spin_unlock(&dev->se_port_lock);
|
||
|
||
return pr_reg;
|
||
out:
|
||
list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
|
||
&pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
|
||
list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
|
||
core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
|
||
kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
|
||
}
|
||
kmem_cache_free(t10_pr_reg_cache, pr_reg);
|
||
return NULL;
|
||
}
|
||
|
||
int core_scsi3_alloc_aptpl_registration(
|
||
struct t10_reservation *pr_tmpl,
|
||
u64 sa_res_key,
|
||
unsigned char *i_port,
|
||
unsigned char *isid,
|
||
u64 mapped_lun,
|
||
unsigned char *t_port,
|
||
u16 tpgt,
|
||
u64 target_lun,
|
||
int res_holder,
|
||
int all_tg_pt,
|
||
u8 type)
|
||
{
|
||
struct t10_pr_registration *pr_reg;
|
||
|
||
if (!i_port || !t_port || !sa_res_key) {
|
||
pr_err("Illegal parameters for APTPL registration\n");
|
||
return -EINVAL;
|
||
}
|
||
|
||
pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
|
||
if (!pr_reg) {
|
||
pr_err("Unable to allocate struct t10_pr_registration\n");
|
||
return -ENOMEM;
|
||
}
|
||
|
||
INIT_LIST_HEAD(&pr_reg->pr_reg_list);
|
||
INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
|
||
INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
|
||
INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
|
||
INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
|
||
atomic_set(&pr_reg->pr_res_holders, 0);
|
||
pr_reg->pr_reg_nacl = NULL;
|
||
pr_reg->pr_reg_deve = NULL;
|
||
pr_reg->pr_res_mapped_lun = mapped_lun;
|
||
pr_reg->pr_aptpl_target_lun = target_lun;
|
||
pr_reg->pr_res_key = sa_res_key;
|
||
pr_reg->pr_reg_all_tg_pt = all_tg_pt;
|
||
pr_reg->pr_reg_aptpl = 1;
|
||
pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
|
||
pr_reg->pr_res_type = type;
|
||
/*
|
||
* If an ISID value had been saved in APTPL metadata for this
|
||
* SCSI Initiator Port, restore it now.
|
||
*/
|
||
if (isid != NULL) {
|
||
pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
|
||
snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
|
||
pr_reg->isid_present_at_reg = 1;
|
||
}
|
||
/*
|
||
* Copy the i_port and t_port information from caller.
|
||
*/
|
||
snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
|
||
snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
|
||
pr_reg->pr_reg_tpgt = tpgt;
|
||
/*
|
||
* Set pr_res_holder from caller, the pr_reg who is the reservation
|
||
* holder will get it's pointer set in core_scsi3_aptpl_reserve() once
|
||
* the Initiator Node LUN ACL from the fabric module is created for
|
||
* this registration.
|
||
*/
|
||
pr_reg->pr_res_holder = res_holder;
|
||
|
||
list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
|
||
pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
|
||
" metadata\n", (res_holder) ? "+reservation" : "");
|
||
return 0;
|
||
}
|
||
|
||
static void core_scsi3_aptpl_reserve(
|
||
struct se_device *dev,
|
||
struct se_portal_group *tpg,
|
||
struct se_node_acl *node_acl,
|
||
struct t10_pr_registration *pr_reg)
|
||
{
|
||
char i_buf[PR_REG_ISID_ID_LEN] = { };
|
||
|
||
core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
|
||
|
||
spin_lock(&dev->dev_reservation_lock);
|
||
dev->dev_pr_res_holder = pr_reg;
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
|
||
pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
|
||
" new reservation holder TYPE: %s ALL_TG_PT: %d\n",
|
||
tpg->se_tpg_tfo->fabric_name,
|
||
core_scsi3_pr_dump_type(pr_reg->pr_res_type),
|
||
(pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
|
||
pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
|
||
tpg->se_tpg_tfo->fabric_name, node_acl->initiatorname,
|
||
i_buf);
|
||
}
|
||
|
||
static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
|
||
struct t10_pr_registration *, enum register_type, int);
|
||
|
||
static int __core_scsi3_check_aptpl_registration(
|
||
struct se_device *dev,
|
||
struct se_portal_group *tpg,
|
||
struct se_lun *lun,
|
||
u64 target_lun,
|
||
struct se_node_acl *nacl,
|
||
u64 mapped_lun)
|
||
{
|
||
struct t10_pr_registration *pr_reg, *pr_reg_tmp;
|
||
struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
||
unsigned char i_port[PR_APTPL_MAX_IPORT_LEN] = { };
|
||
unsigned char t_port[PR_APTPL_MAX_TPORT_LEN] = { };
|
||
u16 tpgt;
|
||
|
||
/*
|
||
* Copy Initiator Port information from struct se_node_acl
|
||
*/
|
||
snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
|
||
snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
|
||
tpg->se_tpg_tfo->tpg_get_wwn(tpg));
|
||
tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
|
||
/*
|
||
* Look for the matching registrations+reservation from those
|
||
* created from APTPL metadata. Note that multiple registrations
|
||
* may exist for fabrics that use ISIDs in their SCSI Initiator Port
|
||
* TransportIDs.
|
||
*/
|
||
spin_lock(&pr_tmpl->aptpl_reg_lock);
|
||
list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
|
||
pr_reg_aptpl_list) {
|
||
|
||
if (!strcmp(pr_reg->pr_iport, i_port) &&
|
||
(pr_reg->pr_res_mapped_lun == mapped_lun) &&
|
||
!(strcmp(pr_reg->pr_tport, t_port)) &&
|
||
(pr_reg->pr_reg_tpgt == tpgt) &&
|
||
(pr_reg->pr_aptpl_target_lun == target_lun)) {
|
||
/*
|
||
* Obtain the ->pr_reg_deve pointer + reference, that
|
||
* is released by __core_scsi3_add_registration() below.
|
||
*/
|
||
rcu_read_lock();
|
||
pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun);
|
||
if (!pr_reg->pr_reg_deve) {
|
||
pr_err("Unable to locate PR APTPL %s mapped_lun:"
|
||
" %llu\n", nacl->initiatorname, mapped_lun);
|
||
rcu_read_unlock();
|
||
continue;
|
||
}
|
||
kref_get(&pr_reg->pr_reg_deve->pr_kref);
|
||
rcu_read_unlock();
|
||
|
||
pr_reg->pr_reg_nacl = nacl;
|
||
pr_reg->tg_pt_sep_rtpi = lun->lun_rtpi;
|
||
list_del(&pr_reg->pr_reg_aptpl_list);
|
||
spin_unlock(&pr_tmpl->aptpl_reg_lock);
|
||
/*
|
||
* At this point all of the pointers in *pr_reg will
|
||
* be setup, so go ahead and add the registration.
|
||
*/
|
||
__core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
|
||
/*
|
||
* If this registration is the reservation holder,
|
||
* make that happen now..
|
||
*/
|
||
if (pr_reg->pr_res_holder)
|
||
core_scsi3_aptpl_reserve(dev, tpg,
|
||
nacl, pr_reg);
|
||
/*
|
||
* Reenable pr_aptpl_active to accept new metadata
|
||
* updates once the SCSI device is active again..
|
||
*/
|
||
spin_lock(&pr_tmpl->aptpl_reg_lock);
|
||
pr_tmpl->pr_aptpl_active = 1;
|
||
}
|
||
}
|
||
spin_unlock(&pr_tmpl->aptpl_reg_lock);
|
||
|
||
return 0;
|
||
}
|
||
|
||
int core_scsi3_check_aptpl_registration(
|
||
struct se_device *dev,
|
||
struct se_portal_group *tpg,
|
||
struct se_lun *lun,
|
||
struct se_node_acl *nacl,
|
||
u64 mapped_lun)
|
||
{
|
||
if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
|
||
return 0;
|
||
|
||
return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
|
||
lun->unpacked_lun, nacl,
|
||
mapped_lun);
|
||
}
|
||
|
||
static void __core_scsi3_dump_registration(
|
||
const struct target_core_fabric_ops *tfo,
|
||
struct se_device *dev,
|
||
struct se_node_acl *nacl,
|
||
struct t10_pr_registration *pr_reg,
|
||
enum register_type register_type)
|
||
{
|
||
struct se_portal_group *se_tpg = nacl->se_tpg;
|
||
char i_buf[PR_REG_ISID_ID_LEN] = { };
|
||
|
||
core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
|
||
|
||
pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
|
||
" Node: %s%s\n", tfo->fabric_name, (register_type == REGISTER_AND_MOVE) ?
|
||
"_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ?
|
||
"_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
|
||
i_buf);
|
||
pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
|
||
tfo->fabric_name, tfo->tpg_get_wwn(se_tpg),
|
||
tfo->tpg_get_tag(se_tpg));
|
||
pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
|
||
" Port(s)\n", tfo->fabric_name,
|
||
(pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
|
||
dev->transport->name);
|
||
pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
|
||
" 0x%08x APTPL: %d\n", tfo->fabric_name,
|
||
pr_reg->pr_res_key, pr_reg->pr_res_generation,
|
||
pr_reg->pr_reg_aptpl);
|
||
}
|
||
|
||
static void __core_scsi3_add_registration(
|
||
struct se_device *dev,
|
||
struct se_node_acl *nacl,
|
||
struct t10_pr_registration *pr_reg,
|
||
enum register_type register_type,
|
||
int register_move)
|
||
{
|
||
const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
|
||
struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
|
||
struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
||
struct se_dev_entry *deve;
|
||
|
||
/*
|
||
* Increment PRgeneration counter for struct se_device upon a successful
|
||
* REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
|
||
*
|
||
* Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
|
||
* action, the struct se_device->dev_reservation_lock will already be held,
|
||
* so we do not call core_scsi3_pr_generation() which grabs the lock
|
||
* for the REGISTER.
|
||
*/
|
||
pr_reg->pr_res_generation = (register_move) ?
|
||
dev->t10_pr.pr_generation++ :
|
||
core_scsi3_pr_generation(dev);
|
||
|
||
spin_lock(&pr_tmpl->registration_lock);
|
||
list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
|
||
|
||
__core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
|
||
spin_unlock(&pr_tmpl->registration_lock);
|
||
/*
|
||
* Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
|
||
*/
|
||
if (!pr_reg->pr_reg_all_tg_pt || register_move)
|
||
goto out;
|
||
/*
|
||
* Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
|
||
* allocated in __core_scsi3_alloc_registration()
|
||
*/
|
||
list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
|
||
&pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
|
||
struct se_node_acl *nacl_tmp = pr_reg_tmp->pr_reg_nacl;
|
||
|
||
list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
|
||
|
||
pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
|
||
|
||
spin_lock(&pr_tmpl->registration_lock);
|
||
list_add_tail(&pr_reg_tmp->pr_reg_list,
|
||
&pr_tmpl->registration_list);
|
||
|
||
__core_scsi3_dump_registration(tfo, dev, nacl_tmp, pr_reg_tmp,
|
||
register_type);
|
||
spin_unlock(&pr_tmpl->registration_lock);
|
||
/*
|
||
* Drop configfs group dependency reference and deve->pr_kref
|
||
* obtained from __core_scsi3_alloc_registration() code.
|
||
*/
|
||
rcu_read_lock();
|
||
deve = pr_reg_tmp->pr_reg_deve;
|
||
if (deve) {
|
||
set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
|
||
core_scsi3_lunacl_undepend_item(deve);
|
||
pr_reg_tmp->pr_reg_deve = NULL;
|
||
}
|
||
rcu_read_unlock();
|
||
}
|
||
out:
|
||
/*
|
||
* Drop deve->pr_kref obtained in __core_scsi3_do_alloc_registration()
|
||
*/
|
||
rcu_read_lock();
|
||
deve = pr_reg->pr_reg_deve;
|
||
if (deve) {
|
||
set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
|
||
kref_put(&deve->pr_kref, target_pr_kref_release);
|
||
pr_reg->pr_reg_deve = NULL;
|
||
}
|
||
rcu_read_unlock();
|
||
}
|
||
|
||
static int core_scsi3_alloc_registration(
|
||
struct se_device *dev,
|
||
struct se_node_acl *nacl,
|
||
struct se_lun *lun,
|
||
struct se_dev_entry *deve,
|
||
u64 mapped_lun,
|
||
unsigned char *isid,
|
||
u64 sa_res_key,
|
||
int all_tg_pt,
|
||
int aptpl,
|
||
enum register_type register_type,
|
||
int register_move)
|
||
{
|
||
struct t10_pr_registration *pr_reg;
|
||
|
||
pr_reg = __core_scsi3_alloc_registration(dev, nacl, lun, deve, mapped_lun,
|
||
isid, sa_res_key, all_tg_pt,
|
||
aptpl);
|
||
if (!pr_reg)
|
||
return -EPERM;
|
||
|
||
__core_scsi3_add_registration(dev, nacl, pr_reg,
|
||
register_type, register_move);
|
||
return 0;
|
||
}
|
||
|
||
static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
|
||
struct se_device *dev,
|
||
struct se_node_acl *nacl,
|
||
unsigned char *isid)
|
||
{
|
||
struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
||
struct t10_pr_registration *pr_reg, *pr_reg_tmp;
|
||
|
||
spin_lock(&pr_tmpl->registration_lock);
|
||
list_for_each_entry_safe(pr_reg, pr_reg_tmp,
|
||
&pr_tmpl->registration_list, pr_reg_list) {
|
||
/*
|
||
* First look for a matching struct se_node_acl
|
||
*/
|
||
if (pr_reg->pr_reg_nacl != nacl)
|
||
continue;
|
||
|
||
/*
|
||
* If this registration does NOT contain a fabric provided
|
||
* ISID, then we have found a match.
|
||
*/
|
||
if (!pr_reg->isid_present_at_reg) {
|
||
atomic_inc_mb(&pr_reg->pr_res_holders);
|
||
spin_unlock(&pr_tmpl->registration_lock);
|
||
return pr_reg;
|
||
}
|
||
/*
|
||
* If the *pr_reg contains a fabric defined ISID for multi-value
|
||
* SCSI Initiator Port TransportIDs, then we expect a valid
|
||
* matching ISID to be provided by the local SCSI Initiator Port.
|
||
*/
|
||
if (!isid)
|
||
continue;
|
||
if (strcmp(isid, pr_reg->pr_reg_isid))
|
||
continue;
|
||
|
||
atomic_inc_mb(&pr_reg->pr_res_holders);
|
||
spin_unlock(&pr_tmpl->registration_lock);
|
||
return pr_reg;
|
||
}
|
||
spin_unlock(&pr_tmpl->registration_lock);
|
||
|
||
return NULL;
|
||
}
|
||
|
||
static struct t10_pr_registration *core_scsi3_locate_pr_reg(
|
||
struct se_device *dev,
|
||
struct se_node_acl *nacl,
|
||
struct se_session *sess)
|
||
{
|
||
struct se_portal_group *tpg = nacl->se_tpg;
|
||
unsigned char buf[PR_REG_ISID_LEN] = { };
|
||
unsigned char *isid_ptr = NULL;
|
||
|
||
if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
|
||
tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
|
||
PR_REG_ISID_LEN);
|
||
isid_ptr = &buf[0];
|
||
}
|
||
|
||
return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
|
||
}
|
||
|
||
static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
|
||
{
|
||
atomic_dec_mb(&pr_reg->pr_res_holders);
|
||
}
|
||
|
||
static int core_scsi3_check_implicit_release(
|
||
struct se_device *dev,
|
||
struct t10_pr_registration *pr_reg)
|
||
{
|
||
struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
|
||
struct t10_pr_registration *pr_res_holder;
|
||
int ret = 0;
|
||
|
||
spin_lock(&dev->dev_reservation_lock);
|
||
pr_res_holder = dev->dev_pr_res_holder;
|
||
if (!pr_res_holder) {
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
return ret;
|
||
}
|
||
if (pr_res_holder == pr_reg) {
|
||
/*
|
||
* Perform an implicit RELEASE if the registration that
|
||
* is being released is holding the reservation.
|
||
*
|
||
* From spc4r17, section 5.7.11.1:
|
||
*
|
||
* e) If the I_T nexus is the persistent reservation holder
|
||
* and the persistent reservation is not an all registrants
|
||
* type, then a PERSISTENT RESERVE OUT command with REGISTER
|
||
* service action or REGISTER AND IGNORE EXISTING KEY
|
||
* service action with the SERVICE ACTION RESERVATION KEY
|
||
* field set to zero (see 5.7.11.3).
|
||
*/
|
||
__core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0, 1);
|
||
ret = 1;
|
||
/*
|
||
* For 'All Registrants' reservation types, all existing
|
||
* registrations are still processed as reservation holders
|
||
* in core_scsi3_pr_seq_non_holder() after the initial
|
||
* reservation holder is implicitly released here.
|
||
*/
|
||
} else if (pr_reg->pr_reg_all_tg_pt &&
|
||
(!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
|
||
pr_reg->pr_reg_nacl->initiatorname)) &&
|
||
(pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
|
||
pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
|
||
" UNREGISTER while existing reservation with matching"
|
||
" key 0x%016Lx is present from another SCSI Initiator"
|
||
" Port\n", pr_reg->pr_res_key);
|
||
ret = -EPERM;
|
||
}
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
|
||
return ret;
|
||
}
|
||
|
||
static void __core_scsi3_free_registration(
|
||
struct se_device *dev,
|
||
struct t10_pr_registration *pr_reg,
|
||
struct list_head *preempt_and_abort_list,
|
||
int dec_holders)
|
||
__releases(&pr_tmpl->registration_lock)
|
||
__acquires(&pr_tmpl->registration_lock)
|
||
{
|
||
const struct target_core_fabric_ops *tfo =
|
||
pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
|
||
struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
||
struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
|
||
struct se_dev_entry *deve;
|
||
char i_buf[PR_REG_ISID_ID_LEN] = { };
|
||
|
||
lockdep_assert_held(&pr_tmpl->registration_lock);
|
||
|
||
core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
|
||
|
||
if (!list_empty(&pr_reg->pr_reg_list))
|
||
list_del(&pr_reg->pr_reg_list);
|
||
/*
|
||
* Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
|
||
* so call core_scsi3_put_pr_reg() to decrement our reference.
|
||
*/
|
||
if (dec_holders)
|
||
core_scsi3_put_pr_reg(pr_reg);
|
||
|
||
spin_unlock(&pr_tmpl->registration_lock);
|
||
/*
|
||
* Wait until all reference from any other I_T nexuses for this
|
||
* *pr_reg have been released. Because list_del() is called above,
|
||
* the last core_scsi3_put_pr_reg(pr_reg) will release this reference
|
||
* count back to zero, and we release *pr_reg.
|
||
*/
|
||
while (atomic_read(&pr_reg->pr_res_holders) != 0) {
|
||
pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
|
||
tfo->fabric_name);
|
||
cpu_relax();
|
||
}
|
||
|
||
rcu_read_lock();
|
||
deve = target_nacl_find_deve(nacl, pr_reg->pr_res_mapped_lun);
|
||
if (deve)
|
||
clear_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
|
||
rcu_read_unlock();
|
||
|
||
spin_lock(&pr_tmpl->registration_lock);
|
||
pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
|
||
" Node: %s%s\n", tfo->fabric_name,
|
||
pr_reg->pr_reg_nacl->initiatorname,
|
||
i_buf);
|
||
pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
|
||
" Port(s)\n", tfo->fabric_name,
|
||
(pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
|
||
dev->transport->name);
|
||
pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
|
||
" 0x%08x\n", tfo->fabric_name, pr_reg->pr_res_key,
|
||
pr_reg->pr_res_generation);
|
||
|
||
if (!preempt_and_abort_list) {
|
||
pr_reg->pr_reg_deve = NULL;
|
||
pr_reg->pr_reg_nacl = NULL;
|
||
kmem_cache_free(t10_pr_reg_cache, pr_reg);
|
||
return;
|
||
}
|
||
/*
|
||
* For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
|
||
* are released once the ABORT_TASK_SET has completed..
|
||
*/
|
||
list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
|
||
}
|
||
|
||
void core_scsi3_free_pr_reg_from_nacl(
|
||
struct se_device *dev,
|
||
struct se_node_acl *nacl)
|
||
{
|
||
struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
||
struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
|
||
bool free_reg = false;
|
||
/*
|
||
* If the passed se_node_acl matches the reservation holder,
|
||
* release the reservation.
|
||
*/
|
||
spin_lock(&dev->dev_reservation_lock);
|
||
pr_res_holder = dev->dev_pr_res_holder;
|
||
if ((pr_res_holder != NULL) &&
|
||
(pr_res_holder->pr_reg_nacl == nacl)) {
|
||
__core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0, 1);
|
||
free_reg = true;
|
||
}
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
/*
|
||
* Release any registration associated with the struct se_node_acl.
|
||
*/
|
||
spin_lock(&pr_tmpl->registration_lock);
|
||
if (pr_res_holder && free_reg)
|
||
__core_scsi3_free_registration(dev, pr_res_holder, NULL, 0);
|
||
|
||
list_for_each_entry_safe(pr_reg, pr_reg_tmp,
|
||
&pr_tmpl->registration_list, pr_reg_list) {
|
||
|
||
if (pr_reg->pr_reg_nacl != nacl)
|
||
continue;
|
||
|
||
__core_scsi3_free_registration(dev, pr_reg, NULL, 0);
|
||
}
|
||
spin_unlock(&pr_tmpl->registration_lock);
|
||
}
|
||
|
||
void core_scsi3_free_all_registrations(
|
||
struct se_device *dev)
|
||
{
|
||
struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
||
struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
|
||
|
||
spin_lock(&dev->dev_reservation_lock);
|
||
pr_res_holder = dev->dev_pr_res_holder;
|
||
if (pr_res_holder != NULL) {
|
||
struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
|
||
__core_scsi3_complete_pro_release(dev, pr_res_nacl,
|
||
pr_res_holder, 0, 0);
|
||
}
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
|
||
spin_lock(&pr_tmpl->registration_lock);
|
||
list_for_each_entry_safe(pr_reg, pr_reg_tmp,
|
||
&pr_tmpl->registration_list, pr_reg_list) {
|
||
|
||
__core_scsi3_free_registration(dev, pr_reg, NULL, 0);
|
||
}
|
||
spin_unlock(&pr_tmpl->registration_lock);
|
||
|
||
spin_lock(&pr_tmpl->aptpl_reg_lock);
|
||
list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
|
||
pr_reg_aptpl_list) {
|
||
list_del(&pr_reg->pr_reg_aptpl_list);
|
||
kmem_cache_free(t10_pr_reg_cache, pr_reg);
|
||
}
|
||
spin_unlock(&pr_tmpl->aptpl_reg_lock);
|
||
}
|
||
|
||
static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
|
||
{
|
||
return target_depend_item(&tpg->tpg_group.cg_item);
|
||
}
|
||
|
||
static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
|
||
{
|
||
target_undepend_item(&tpg->tpg_group.cg_item);
|
||
atomic_dec_mb(&tpg->tpg_pr_ref_count);
|
||
}
|
||
|
||
static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
|
||
{
|
||
if (nacl->dynamic_node_acl)
|
||
return 0;
|
||
return target_depend_item(&nacl->acl_group.cg_item);
|
||
}
|
||
|
||
static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
|
||
{
|
||
if (!nacl->dynamic_node_acl)
|
||
target_undepend_item(&nacl->acl_group.cg_item);
|
||
atomic_dec_mb(&nacl->acl_pr_ref_count);
|
||
}
|
||
|
||
static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
|
||
{
|
||
struct se_lun_acl *lun_acl;
|
||
|
||
/*
|
||
* For nacl->dynamic_node_acl=1
|
||
*/
|
||
lun_acl = rcu_dereference_check(se_deve->se_lun_acl,
|
||
kref_read(&se_deve->pr_kref) != 0);
|
||
if (!lun_acl)
|
||
return 0;
|
||
|
||
return target_depend_item(&lun_acl->se_lun_group.cg_item);
|
||
}
|
||
|
||
static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
|
||
{
|
||
struct se_lun_acl *lun_acl;
|
||
|
||
/*
|
||
* For nacl->dynamic_node_acl=1
|
||
*/
|
||
lun_acl = rcu_dereference_check(se_deve->se_lun_acl,
|
||
kref_read(&se_deve->pr_kref) != 0);
|
||
if (!lun_acl) {
|
||
kref_put(&se_deve->pr_kref, target_pr_kref_release);
|
||
return;
|
||
}
|
||
|
||
target_undepend_item(&lun_acl->se_lun_group.cg_item);
|
||
kref_put(&se_deve->pr_kref, target_pr_kref_release);
|
||
}
|
||
|
||
static sense_reason_t
|
||
core_scsi3_decode_spec_i_port(
|
||
struct se_cmd *cmd,
|
||
struct se_portal_group *tpg,
|
||
unsigned char *l_isid,
|
||
u64 sa_res_key,
|
||
int all_tg_pt,
|
||
int aptpl)
|
||
{
|
||
struct se_device *dev = cmd->se_dev;
|
||
struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
|
||
struct se_session *se_sess = cmd->se_sess;
|
||
struct se_node_acl *dest_node_acl = NULL;
|
||
struct se_dev_entry *dest_se_deve = NULL;
|
||
struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
|
||
struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
|
||
LIST_HEAD(tid_dest_list);
|
||
struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
|
||
unsigned char *buf, *ptr, proto_ident;
|
||
const unsigned char *i_str = NULL;
|
||
char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN];
|
||
sense_reason_t ret;
|
||
u32 tpdl, tid_len = 0;
|
||
u32 dest_rtpi = 0;
|
||
|
||
/*
|
||
* Allocate a struct pr_transport_id_holder and setup the
|
||
* local_node_acl pointer and add to struct list_head tid_dest_list
|
||
* for add registration processing in the loop of tid_dest_list below.
|
||
*/
|
||
tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
|
||
if (!tidh_new) {
|
||
pr_err("Unable to allocate tidh_new\n");
|
||
return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
|
||
}
|
||
INIT_LIST_HEAD(&tidh_new->dest_list);
|
||
tidh_new->dest_tpg = tpg;
|
||
tidh_new->dest_node_acl = se_sess->se_node_acl;
|
||
|
||
local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
|
||
se_sess->se_node_acl, cmd->se_lun,
|
||
NULL, cmd->orig_fe_lun, l_isid,
|
||
sa_res_key, all_tg_pt, aptpl);
|
||
if (!local_pr_reg) {
|
||
kfree(tidh_new);
|
||
return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
|
||
}
|
||
|
||
if (core_scsi3_lunacl_depend_item(local_pr_reg->pr_reg_deve)) {
|
||
kfree(tidh_new);
|
||
kref_put(&local_pr_reg->pr_reg_deve->pr_kref,
|
||
target_pr_kref_release);
|
||
kmem_cache_free(t10_pr_reg_cache, local_pr_reg);
|
||
return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
|
||
}
|
||
|
||
tidh_new->dest_pr_reg = local_pr_reg;
|
||
list_add_tail(&tidh_new->dest_list, &tid_dest_list);
|
||
|
||
if (cmd->data_length < 28) {
|
||
pr_warn("SPC-PR: Received PR OUT parameter list"
|
||
" length too small: %u\n", cmd->data_length);
|
||
ret = TCM_INVALID_PARAMETER_LIST;
|
||
goto out;
|
||
}
|
||
|
||
buf = transport_kmap_data_sg(cmd);
|
||
if (!buf) {
|
||
ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
|
||
goto out;
|
||
}
|
||
|
||
/*
|
||
* For a PERSISTENT RESERVE OUT specify initiator ports payload,
|
||
* first extract TransportID Parameter Data Length, and make sure
|
||
* the value matches up to the SCSI expected data transfer length.
|
||
*/
|
||
tpdl = get_unaligned_be32(&buf[24]);
|
||
|
||
if ((tpdl + 28) != cmd->data_length) {
|
||
pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
|
||
" does not equal CDB data_length: %u\n", tpdl,
|
||
cmd->data_length);
|
||
ret = TCM_INVALID_PARAMETER_LIST;
|
||
goto out_unmap;
|
||
}
|
||
/*
|
||
* Start processing the received transport IDs using the
|
||
* receiving I_T Nexus portal's fabric dependent methods to
|
||
* obtain the SCSI Initiator Port/Device Identifiers.
|
||
*/
|
||
ptr = &buf[28];
|
||
|
||
while (tpdl > 0) {
|
||
struct se_lun *dest_lun, *tmp_lun;
|
||
|
||
proto_ident = (ptr[0] & 0x0f);
|
||
dest_tpg = NULL;
|
||
|
||
spin_lock(&dev->se_port_lock);
|
||
list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) {
|
||
tmp_tpg = tmp_lun->lun_tpg;
|
||
|
||
/*
|
||
* Look for the matching proto_ident provided by
|
||
* the received TransportID
|
||
*/
|
||
if (tmp_tpg->proto_id != proto_ident)
|
||
continue;
|
||
dest_rtpi = tmp_lun->lun_rtpi;
|
||
|
||
iport_ptr = NULL;
|
||
i_str = target_parse_pr_out_transport_id(tmp_tpg,
|
||
ptr, &tid_len, &iport_ptr);
|
||
if (!i_str)
|
||
continue;
|
||
/*
|
||
* Determine if this SCSI device server requires that
|
||
* SCSI Intiatior TransportID w/ ISIDs is enforced
|
||
* for fabric modules (iSCSI) requiring them.
|
||
*/
|
||
if (tpg->se_tpg_tfo->sess_get_initiator_sid &&
|
||
dev->dev_attrib.enforce_pr_isids &&
|
||
!iport_ptr) {
|
||
pr_warn("SPC-PR: enforce_pr_isids is set but a isid has not been sent in the SPEC_I_PT data for %s.",
|
||
i_str);
|
||
ret = TCM_INVALID_PARAMETER_LIST;
|
||
spin_unlock(&dev->se_port_lock);
|
||
goto out_unmap;
|
||
}
|
||
|
||
atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count);
|
||
spin_unlock(&dev->se_port_lock);
|
||
|
||
if (core_scsi3_tpg_depend_item(tmp_tpg)) {
|
||
pr_err(" core_scsi3_tpg_depend_item()"
|
||
" for tmp_tpg\n");
|
||
atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count);
|
||
ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
||
goto out_unmap;
|
||
}
|
||
/*
|
||
* Locate the destination initiator ACL to be registered
|
||
* from the decoded fabric module specific TransportID
|
||
* at *i_str.
|
||
*/
|
||
mutex_lock(&tmp_tpg->acl_node_mutex);
|
||
dest_node_acl = __core_tpg_get_initiator_node_acl(
|
||
tmp_tpg, i_str);
|
||
if (dest_node_acl)
|
||
atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
|
||
mutex_unlock(&tmp_tpg->acl_node_mutex);
|
||
|
||
if (!dest_node_acl) {
|
||
core_scsi3_tpg_undepend_item(tmp_tpg);
|
||
spin_lock(&dev->se_port_lock);
|
||
continue;
|
||
}
|
||
|
||
if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
|
||
pr_err("configfs_depend_item() failed"
|
||
" for dest_node_acl->acl_group\n");
|
||
atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
|
||
core_scsi3_tpg_undepend_item(tmp_tpg);
|
||
ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
||
goto out_unmap;
|
||
}
|
||
|
||
dest_tpg = tmp_tpg;
|
||
pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s Port RTPI: %u\n",
|
||
dest_tpg->se_tpg_tfo->fabric_name,
|
||
dest_node_acl->initiatorname, dest_rtpi);
|
||
|
||
spin_lock(&dev->se_port_lock);
|
||
break;
|
||
}
|
||
spin_unlock(&dev->se_port_lock);
|
||
|
||
if (!dest_tpg) {
|
||
pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
|
||
" dest_tpg\n");
|
||
ret = TCM_INVALID_PARAMETER_LIST;
|
||
goto out_unmap;
|
||
}
|
||
|
||
pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
|
||
" tid_len: %d for %s + %s\n",
|
||
dest_tpg->se_tpg_tfo->fabric_name, cmd->data_length,
|
||
tpdl, tid_len, i_str, iport_ptr);
|
||
|
||
if (tid_len > tpdl) {
|
||
pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
|
||
" %u for Transport ID: %s\n", tid_len, ptr);
|
||
core_scsi3_nodeacl_undepend_item(dest_node_acl);
|
||
core_scsi3_tpg_undepend_item(dest_tpg);
|
||
ret = TCM_INVALID_PARAMETER_LIST;
|
||
goto out_unmap;
|
||
}
|
||
/*
|
||
* Locate the desintation struct se_dev_entry pointer for matching
|
||
* RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
|
||
* Target Port.
|
||
*/
|
||
dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
|
||
dest_rtpi);
|
||
if (!dest_se_deve) {
|
||
pr_err("Unable to locate %s dest_se_deve from destination RTPI: %u\n",
|
||
dest_tpg->se_tpg_tfo->fabric_name,
|
||
dest_rtpi);
|
||
|
||
core_scsi3_nodeacl_undepend_item(dest_node_acl);
|
||
core_scsi3_tpg_undepend_item(dest_tpg);
|
||
ret = TCM_INVALID_PARAMETER_LIST;
|
||
goto out_unmap;
|
||
}
|
||
|
||
if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
|
||
pr_err("core_scsi3_lunacl_depend_item()"
|
||
" failed\n");
|
||
kref_put(&dest_se_deve->pr_kref, target_pr_kref_release);
|
||
core_scsi3_nodeacl_undepend_item(dest_node_acl);
|
||
core_scsi3_tpg_undepend_item(dest_tpg);
|
||
ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
||
goto out_unmap;
|
||
}
|
||
|
||
pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
|
||
" dest_se_deve mapped_lun: %llu\n",
|
||
dest_tpg->se_tpg_tfo->fabric_name,
|
||
dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
|
||
|
||
/*
|
||
* Skip any TransportIDs that already have a registration for
|
||
* this target port.
|
||
*/
|
||
pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
|
||
iport_ptr);
|
||
if (pr_reg_e) {
|
||
core_scsi3_put_pr_reg(pr_reg_e);
|
||
core_scsi3_lunacl_undepend_item(dest_se_deve);
|
||
core_scsi3_nodeacl_undepend_item(dest_node_acl);
|
||
core_scsi3_tpg_undepend_item(dest_tpg);
|
||
ptr += tid_len;
|
||
tpdl -= tid_len;
|
||
tid_len = 0;
|
||
continue;
|
||
}
|
||
/*
|
||
* Allocate a struct pr_transport_id_holder and setup
|
||
* the dest_node_acl and dest_se_deve pointers for the
|
||
* loop below.
|
||
*/
|
||
tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
|
||
GFP_KERNEL);
|
||
if (!tidh_new) {
|
||
pr_err("Unable to allocate tidh_new\n");
|
||
core_scsi3_lunacl_undepend_item(dest_se_deve);
|
||
core_scsi3_nodeacl_undepend_item(dest_node_acl);
|
||
core_scsi3_tpg_undepend_item(dest_tpg);
|
||
ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
||
goto out_unmap;
|
||
}
|
||
INIT_LIST_HEAD(&tidh_new->dest_list);
|
||
tidh_new->dest_tpg = dest_tpg;
|
||
tidh_new->dest_node_acl = dest_node_acl;
|
||
tidh_new->dest_se_deve = dest_se_deve;
|
||
|
||
/*
|
||
* Allocate, but do NOT add the registration for the
|
||
* TransportID referenced SCSI Initiator port. This
|
||
* done because of the following from spc4r17 in section
|
||
* 6.14.3 wrt SPEC_I_PT:
|
||
*
|
||
* "If a registration fails for any initiator port (e.g., if th
|
||
* logical unit does not have enough resources available to
|
||
* hold the registration information), no registrations shall be
|
||
* made, and the command shall be terminated with
|
||
* CHECK CONDITION status."
|
||
*
|
||
* That means we call __core_scsi3_alloc_registration() here,
|
||
* and then call __core_scsi3_add_registration() in the
|
||
* 2nd loop which will never fail.
|
||
*/
|
||
dest_lun = rcu_dereference_check(dest_se_deve->se_lun,
|
||
kref_read(&dest_se_deve->pr_kref) != 0);
|
||
|
||
dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
|
||
dest_node_acl, dest_lun, dest_se_deve,
|
||
dest_se_deve->mapped_lun, iport_ptr,
|
||
sa_res_key, all_tg_pt, aptpl);
|
||
if (!dest_pr_reg) {
|
||
core_scsi3_lunacl_undepend_item(dest_se_deve);
|
||
core_scsi3_nodeacl_undepend_item(dest_node_acl);
|
||
core_scsi3_tpg_undepend_item(dest_tpg);
|
||
kfree(tidh_new);
|
||
ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
|
||
goto out_unmap;
|
||
}
|
||
tidh_new->dest_pr_reg = dest_pr_reg;
|
||
list_add_tail(&tidh_new->dest_list, &tid_dest_list);
|
||
|
||
ptr += tid_len;
|
||
tpdl -= tid_len;
|
||
tid_len = 0;
|
||
|
||
}
|
||
|
||
transport_kunmap_data_sg(cmd);
|
||
|
||
/*
|
||
* Go ahead and create a registrations from tid_dest_list for the
|
||
* SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
|
||
* and dest_se_deve.
|
||
*
|
||
* The SA Reservation Key from the PROUT is set for the
|
||
* registration, and ALL_TG_PT is also passed. ALL_TG_PT=1
|
||
* means that the TransportID Initiator port will be
|
||
* registered on all of the target ports in the SCSI target device
|
||
* ALL_TG_PT=0 means the registration will only be for the
|
||
* SCSI target port the PROUT REGISTER with SPEC_I_PT=1
|
||
* was received.
|
||
*/
|
||
list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
|
||
dest_tpg = tidh->dest_tpg;
|
||
dest_node_acl = tidh->dest_node_acl;
|
||
dest_se_deve = tidh->dest_se_deve;
|
||
dest_pr_reg = tidh->dest_pr_reg;
|
||
|
||
list_del(&tidh->dest_list);
|
||
kfree(tidh);
|
||
|
||
memset(i_buf, 0, PR_REG_ISID_ID_LEN);
|
||
core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN);
|
||
|
||
__core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
|
||
dest_pr_reg, 0, 0);
|
||
|
||
pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
|
||
" registered Transport ID for Node: %s%s Mapped LUN:"
|
||
" %llu\n", dest_tpg->se_tpg_tfo->fabric_name,
|
||
dest_node_acl->initiatorname, i_buf, (dest_se_deve) ?
|
||
dest_se_deve->mapped_lun : 0);
|
||
|
||
if (dest_pr_reg == local_pr_reg)
|
||
continue;
|
||
|
||
core_scsi3_nodeacl_undepend_item(dest_node_acl);
|
||
core_scsi3_tpg_undepend_item(dest_tpg);
|
||
}
|
||
|
||
return 0;
|
||
out_unmap:
|
||
transport_kunmap_data_sg(cmd);
|
||
out:
|
||
/*
|
||
* For the failure case, release everything from tid_dest_list
|
||
* including *dest_pr_reg and the configfs dependances..
|
||
*/
|
||
list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
|
||
bool is_local = false;
|
||
|
||
dest_tpg = tidh->dest_tpg;
|
||
dest_node_acl = tidh->dest_node_acl;
|
||
dest_se_deve = tidh->dest_se_deve;
|
||
dest_pr_reg = tidh->dest_pr_reg;
|
||
|
||
if (dest_pr_reg == local_pr_reg)
|
||
is_local = true;
|
||
|
||
list_del(&tidh->dest_list);
|
||
kfree(tidh);
|
||
/*
|
||
* Release any extra ALL_TG_PT=1 registrations for
|
||
* the SPEC_I_PT=1 case.
|
||
*/
|
||
list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
|
||
&dest_pr_reg->pr_reg_atp_list,
|
||
pr_reg_atp_mem_list) {
|
||
list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
|
||
core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
|
||
kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
|
||
}
|
||
|
||
kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
|
||
core_scsi3_lunacl_undepend_item(dest_se_deve);
|
||
|
||
if (is_local)
|
||
continue;
|
||
|
||
core_scsi3_nodeacl_undepend_item(dest_node_acl);
|
||
core_scsi3_tpg_undepend_item(dest_tpg);
|
||
}
|
||
return ret;
|
||
}
|
||
|
||
static int core_scsi3_update_aptpl_buf(
|
||
struct se_device *dev,
|
||
unsigned char *buf,
|
||
u32 pr_aptpl_buf_len)
|
||
{
|
||
struct se_portal_group *tpg;
|
||
struct t10_pr_registration *pr_reg;
|
||
unsigned char tmp[512], isid_buf[32];
|
||
ssize_t len = 0;
|
||
int reg_count = 0;
|
||
int ret = 0;
|
||
|
||
spin_lock(&dev->dev_reservation_lock);
|
||
spin_lock(&dev->t10_pr.registration_lock);
|
||
/*
|
||
* Walk the registration list..
|
||
*/
|
||
list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
|
||
pr_reg_list) {
|
||
|
||
tmp[0] = '\0';
|
||
isid_buf[0] = '\0';
|
||
tpg = pr_reg->pr_reg_nacl->se_tpg;
|
||
/*
|
||
* Write out any ISID value to APTPL metadata that was included
|
||
* in the original registration.
|
||
*/
|
||
if (pr_reg->isid_present_at_reg)
|
||
snprintf(isid_buf, 32, "initiator_sid=%s\n",
|
||
pr_reg->pr_reg_isid);
|
||
/*
|
||
* Include special metadata if the pr_reg matches the
|
||
* reservation holder.
|
||
*/
|
||
if (dev->dev_pr_res_holder == pr_reg) {
|
||
snprintf(tmp, 512, "PR_REG_START: %d"
|
||
"\ninitiator_fabric=%s\n"
|
||
"initiator_node=%s\n%s"
|
||
"sa_res_key=%llu\n"
|
||
"res_holder=1\nres_type=%02x\n"
|
||
"res_scope=%02x\nres_all_tg_pt=%d\n"
|
||
"mapped_lun=%llu\n", reg_count,
|
||
tpg->se_tpg_tfo->fabric_name,
|
||
pr_reg->pr_reg_nacl->initiatorname, isid_buf,
|
||
pr_reg->pr_res_key, pr_reg->pr_res_type,
|
||
pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
|
||
pr_reg->pr_res_mapped_lun);
|
||
} else {
|
||
snprintf(tmp, 512, "PR_REG_START: %d\n"
|
||
"initiator_fabric=%s\ninitiator_node=%s\n%s"
|
||
"sa_res_key=%llu\nres_holder=0\n"
|
||
"res_all_tg_pt=%d\nmapped_lun=%llu\n",
|
||
reg_count, tpg->se_tpg_tfo->fabric_name,
|
||
pr_reg->pr_reg_nacl->initiatorname, isid_buf,
|
||
pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
|
||
pr_reg->pr_res_mapped_lun);
|
||
}
|
||
|
||
if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
|
||
pr_err("Unable to update renaming APTPL metadata,"
|
||
" reallocating larger buffer\n");
|
||
ret = -EMSGSIZE;
|
||
goto out;
|
||
}
|
||
len += sprintf(buf+len, "%s", tmp);
|
||
|
||
/*
|
||
* Include information about the associated SCSI target port.
|
||
*/
|
||
snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
|
||
"tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%llu\nPR_REG_END:"
|
||
" %d\n", tpg->se_tpg_tfo->fabric_name,
|
||
tpg->se_tpg_tfo->tpg_get_wwn(tpg),
|
||
tpg->se_tpg_tfo->tpg_get_tag(tpg),
|
||
pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun,
|
||
reg_count);
|
||
|
||
if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
|
||
pr_err("Unable to update renaming APTPL metadata,"
|
||
" reallocating larger buffer\n");
|
||
ret = -EMSGSIZE;
|
||
goto out;
|
||
}
|
||
len += sprintf(buf+len, "%s", tmp);
|
||
reg_count++;
|
||
}
|
||
|
||
if (!reg_count)
|
||
len += sprintf(buf+len, "No Registrations or Reservations");
|
||
|
||
out:
|
||
spin_unlock(&dev->t10_pr.registration_lock);
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
|
||
return ret;
|
||
}
|
||
|
||
static int __core_scsi3_write_aptpl_to_file(
|
||
struct se_device *dev,
|
||
unsigned char *buf)
|
||
{
|
||
struct t10_wwn *wwn = &dev->t10_wwn;
|
||
struct file *file;
|
||
int flags = O_RDWR | O_CREAT | O_TRUNC;
|
||
char *path;
|
||
u32 pr_aptpl_buf_len;
|
||
int ret;
|
||
loff_t pos = 0;
|
||
|
||
path = kasprintf(GFP_KERNEL, "%s/pr/aptpl_%s", db_root,
|
||
&wwn->unit_serial[0]);
|
||
if (!path)
|
||
return -ENOMEM;
|
||
|
||
file = filp_open(path, flags, 0600);
|
||
if (IS_ERR(file)) {
|
||
pr_err("filp_open(%s) for APTPL metadata"
|
||
" failed\n", path);
|
||
kfree(path);
|
||
return PTR_ERR(file);
|
||
}
|
||
|
||
pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */
|
||
|
||
ret = kernel_write(file, buf, pr_aptpl_buf_len, &pos);
|
||
|
||
if (ret < 0)
|
||
pr_debug("Error writing APTPL metadata file: %s\n", path);
|
||
fput(file);
|
||
kfree(path);
|
||
|
||
return (ret < 0) ? -EIO : 0;
|
||
}
|
||
|
||
/*
|
||
* Clear the APTPL metadata if APTPL has been disabled, otherwise
|
||
* write out the updated metadata to struct file for this SCSI device.
|
||
*/
|
||
static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl)
|
||
{
|
||
unsigned char *buf;
|
||
int rc, len = PR_APTPL_BUF_LEN;
|
||
|
||
if (!aptpl) {
|
||
char *null_buf = "No Registrations or Reservations\n";
|
||
|
||
rc = __core_scsi3_write_aptpl_to_file(dev, null_buf);
|
||
dev->t10_pr.pr_aptpl_active = 0;
|
||
pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n");
|
||
|
||
if (rc)
|
||
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
||
|
||
return 0;
|
||
}
|
||
retry:
|
||
buf = vzalloc(len);
|
||
if (!buf)
|
||
return TCM_OUT_OF_RESOURCES;
|
||
|
||
rc = core_scsi3_update_aptpl_buf(dev, buf, len);
|
||
if (rc < 0) {
|
||
vfree(buf);
|
||
len *= 2;
|
||
goto retry;
|
||
}
|
||
|
||
rc = __core_scsi3_write_aptpl_to_file(dev, buf);
|
||
if (rc != 0) {
|
||
pr_err("SPC-3 PR: Could not update APTPL\n");
|
||
vfree(buf);
|
||
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
||
}
|
||
dev->t10_pr.pr_aptpl_active = 1;
|
||
vfree(buf);
|
||
pr_debug("SPC-3 PR: Set APTPL Bit Activated\n");
|
||
return 0;
|
||
}
|
||
|
||
static sense_reason_t
|
||
core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,
|
||
bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type)
|
||
{
|
||
struct se_session *se_sess = cmd->se_sess;
|
||
struct se_device *dev = cmd->se_dev;
|
||
struct se_lun *se_lun = cmd->se_lun;
|
||
struct se_portal_group *se_tpg;
|
||
struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp;
|
||
struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
||
unsigned char isid_buf[PR_REG_ISID_LEN] = { };
|
||
unsigned char *isid_ptr = NULL;
|
||
sense_reason_t ret = TCM_NO_SENSE;
|
||
int pr_holder = 0, type;
|
||
|
||
if (!se_sess || !se_lun) {
|
||
pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
|
||
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
||
}
|
||
se_tpg = se_sess->se_tpg;
|
||
|
||
if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
|
||
se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
|
||
PR_REG_ISID_LEN);
|
||
isid_ptr = &isid_buf[0];
|
||
}
|
||
/*
|
||
* Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
|
||
*/
|
||
pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
|
||
if (!pr_reg) {
|
||
if (res_key) {
|
||
pr_warn("SPC-3 PR: Reservation Key non-zero"
|
||
" for SA REGISTER, returning CONFLICT\n");
|
||
return TCM_RESERVATION_CONFLICT;
|
||
}
|
||
/*
|
||
* Do nothing but return GOOD status.
|
||
*/
|
||
if (!sa_res_key)
|
||
return 0;
|
||
|
||
if (!spec_i_pt) {
|
||
/*
|
||
* Perform the Service Action REGISTER on the Initiator
|
||
* Port Endpoint that the PRO was received from on the
|
||
* Logical Unit of the SCSI device server.
|
||
*/
|
||
if (core_scsi3_alloc_registration(cmd->se_dev,
|
||
se_sess->se_node_acl, cmd->se_lun,
|
||
NULL, cmd->orig_fe_lun, isid_ptr,
|
||
sa_res_key, all_tg_pt, aptpl,
|
||
register_type, 0)) {
|
||
pr_err("Unable to allocate"
|
||
" struct t10_pr_registration\n");
|
||
return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
|
||
}
|
||
} else {
|
||
/*
|
||
* Register both the Initiator port that received
|
||
* PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
|
||
* TransportID from Parameter list and loop through
|
||
* fabric dependent parameter list while calling
|
||
* logic from of core_scsi3_alloc_registration() for
|
||
* each TransportID provided SCSI Initiator Port/Device
|
||
*/
|
||
ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
|
||
isid_ptr, sa_res_key, all_tg_pt, aptpl);
|
||
if (ret != 0)
|
||
return ret;
|
||
}
|
||
return core_scsi3_update_and_write_aptpl(dev, aptpl);
|
||
}
|
||
|
||
/* ok, existing registration */
|
||
|
||
if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) {
|
||
pr_err("SPC-3 PR REGISTER: Received"
|
||
" res_key: 0x%016Lx does not match"
|
||
" existing SA REGISTER res_key:"
|
||
" 0x%016Lx\n", res_key,
|
||
pr_reg->pr_res_key);
|
||
ret = TCM_RESERVATION_CONFLICT;
|
||
goto out;
|
||
}
|
||
|
||
if (spec_i_pt) {
|
||
pr_err("SPC-3 PR REGISTER: SPEC_I_PT"
|
||
" set on a registered nexus\n");
|
||
ret = TCM_INVALID_PARAMETER_LIST;
|
||
goto out;
|
||
}
|
||
|
||
/*
|
||
* An existing ALL_TG_PT=1 registration being released
|
||
* must also set ALL_TG_PT=1 in the incoming PROUT.
|
||
*/
|
||
if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) {
|
||
pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1"
|
||
" registration exists, but ALL_TG_PT=1 bit not"
|
||
" present in received PROUT\n");
|
||
ret = TCM_INVALID_CDB_FIELD;
|
||
goto out;
|
||
}
|
||
|
||
/*
|
||
* sa_res_key=1 Change Reservation Key for registered I_T Nexus.
|
||
*/
|
||
if (sa_res_key) {
|
||
/*
|
||
* Increment PRgeneration counter for struct se_device"
|
||
* upon a successful REGISTER, see spc4r17 section 6.3.2
|
||
* READ_KEYS service action.
|
||
*/
|
||
pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev);
|
||
pr_reg->pr_res_key = sa_res_key;
|
||
pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
|
||
" Key for %s to: 0x%016Lx PRgeneration:"
|
||
" 0x%08x\n", cmd->se_tfo->fabric_name,
|
||
(register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "",
|
||
pr_reg->pr_reg_nacl->initiatorname,
|
||
pr_reg->pr_res_key, pr_reg->pr_res_generation);
|
||
|
||
} else {
|
||
/*
|
||
* sa_res_key=0 Unregister Reservation Key for registered I_T Nexus.
|
||
*/
|
||
type = pr_reg->pr_res_type;
|
||
pr_holder = core_scsi3_check_implicit_release(cmd->se_dev,
|
||
pr_reg);
|
||
if (pr_holder < 0) {
|
||
ret = TCM_RESERVATION_CONFLICT;
|
||
goto out;
|
||
}
|
||
|
||
spin_lock(&pr_tmpl->registration_lock);
|
||
/*
|
||
* Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
|
||
* and matching pr_res_key.
|
||
*/
|
||
if (pr_reg->pr_reg_all_tg_pt) {
|
||
list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
|
||
&pr_tmpl->registration_list,
|
||
pr_reg_list) {
|
||
|
||
if (!pr_reg_p->pr_reg_all_tg_pt)
|
||
continue;
|
||
if (pr_reg_p->pr_res_key != res_key)
|
||
continue;
|
||
if (pr_reg == pr_reg_p)
|
||
continue;
|
||
if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
|
||
pr_reg_p->pr_reg_nacl->initiatorname))
|
||
continue;
|
||
|
||
__core_scsi3_free_registration(dev,
|
||
pr_reg_p, NULL, 0);
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Release the calling I_T Nexus registration now..
|
||
*/
|
||
__core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1);
|
||
pr_reg = NULL;
|
||
|
||
/*
|
||
* From spc4r17, section 5.7.11.3 Unregistering
|
||
*
|
||
* If the persistent reservation is a registrants only
|
||
* type, the device server shall establish a unit
|
||
* attention condition for the initiator port associated
|
||
* with every registered I_T nexus except for the I_T
|
||
* nexus on which the PERSISTENT RESERVE OUT command was
|
||
* received, with the additional sense code set to
|
||
* RESERVATIONS RELEASED.
|
||
*/
|
||
if (pr_holder &&
|
||
(type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY ||
|
||
type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) {
|
||
list_for_each_entry(pr_reg_p,
|
||
&pr_tmpl->registration_list,
|
||
pr_reg_list) {
|
||
|
||
target_ua_allocate_lun(
|
||
pr_reg_p->pr_reg_nacl,
|
||
pr_reg_p->pr_res_mapped_lun,
|
||
0x2A,
|
||
ASCQ_2AH_RESERVATIONS_RELEASED);
|
||
}
|
||
}
|
||
|
||
spin_unlock(&pr_tmpl->registration_lock);
|
||
}
|
||
|
||
ret = core_scsi3_update_and_write_aptpl(dev, aptpl);
|
||
|
||
out:
|
||
if (pr_reg)
|
||
core_scsi3_put_pr_reg(pr_reg);
|
||
return ret;
|
||
}
|
||
|
||
unsigned char *core_scsi3_pr_dump_type(int type)
|
||
{
|
||
switch (type) {
|
||
case PR_TYPE_WRITE_EXCLUSIVE:
|
||
return "Write Exclusive Access";
|
||
case PR_TYPE_EXCLUSIVE_ACCESS:
|
||
return "Exclusive Access";
|
||
case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
|
||
return "Write Exclusive Access, Registrants Only";
|
||
case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
|
||
return "Exclusive Access, Registrants Only";
|
||
case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
|
||
return "Write Exclusive Access, All Registrants";
|
||
case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
|
||
return "Exclusive Access, All Registrants";
|
||
default:
|
||
break;
|
||
}
|
||
|
||
return "Unknown SPC-3 PR Type";
|
||
}
|
||
|
||
static sense_reason_t
|
||
core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key)
|
||
{
|
||
struct se_device *dev = cmd->se_dev;
|
||
struct se_session *se_sess = cmd->se_sess;
|
||
struct se_lun *se_lun = cmd->se_lun;
|
||
struct t10_pr_registration *pr_reg, *pr_res_holder;
|
||
struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
||
char i_buf[PR_REG_ISID_ID_LEN] = { };
|
||
sense_reason_t ret;
|
||
|
||
if (!se_sess || !se_lun) {
|
||
pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
|
||
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
||
}
|
||
/*
|
||
* Locate the existing *pr_reg via struct se_node_acl pointers
|
||
*/
|
||
pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
|
||
se_sess);
|
||
if (!pr_reg) {
|
||
pr_err("SPC-3 PR: Unable to locate"
|
||
" PR_REGISTERED *pr_reg for RESERVE\n");
|
||
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
||
}
|
||
/*
|
||
* From spc4r17 Section 5.7.9: Reserving:
|
||
*
|
||
* An application client creates a persistent reservation by issuing
|
||
* a PERSISTENT RESERVE OUT command with RESERVE service action through
|
||
* a registered I_T nexus with the following parameters:
|
||
* a) RESERVATION KEY set to the value of the reservation key that is
|
||
* registered with the logical unit for the I_T nexus; and
|
||
*/
|
||
if (res_key != pr_reg->pr_res_key) {
|
||
pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
|
||
" does not match existing SA REGISTER res_key:"
|
||
" 0x%016Lx\n", res_key, pr_reg->pr_res_key);
|
||
ret = TCM_RESERVATION_CONFLICT;
|
||
goto out_put_pr_reg;
|
||
}
|
||
/*
|
||
* From spc4r17 Section 5.7.9: Reserving:
|
||
*
|
||
* From above:
|
||
* b) TYPE field and SCOPE field set to the persistent reservation
|
||
* being created.
|
||
*
|
||
* Only one persistent reservation is allowed at a time per logical unit
|
||
* and that persistent reservation has a scope of LU_SCOPE.
|
||
*/
|
||
if (scope != PR_SCOPE_LU_SCOPE) {
|
||
pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
|
||
ret = TCM_INVALID_PARAMETER_LIST;
|
||
goto out_put_pr_reg;
|
||
}
|
||
/*
|
||
* See if we have an existing PR reservation holder pointer at
|
||
* struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
|
||
* *pr_res_holder.
|
||
*/
|
||
spin_lock(&dev->dev_reservation_lock);
|
||
pr_res_holder = dev->dev_pr_res_holder;
|
||
if (pr_res_holder) {
|
||
/*
|
||
* From spc4r17 Section 5.7.9: Reserving:
|
||
*
|
||
* If the device server receives a PERSISTENT RESERVE OUT
|
||
* command from an I_T nexus other than a persistent reservation
|
||
* holder (see 5.7.10) that attempts to create a persistent
|
||
* reservation when a persistent reservation already exists for
|
||
* the logical unit, then the command shall be completed with
|
||
* RESERVATION CONFLICT status.
|
||
*/
|
||
if (!is_reservation_holder(pr_res_holder, pr_reg)) {
|
||
struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
|
||
pr_err("SPC-3 PR: Attempted RESERVE from"
|
||
" [%s]: %s while reservation already held by"
|
||
" [%s]: %s, returning RESERVATION_CONFLICT\n",
|
||
cmd->se_tfo->fabric_name,
|
||
se_sess->se_node_acl->initiatorname,
|
||
pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name,
|
||
pr_res_holder->pr_reg_nacl->initiatorname);
|
||
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
ret = TCM_RESERVATION_CONFLICT;
|
||
goto out_put_pr_reg;
|
||
}
|
||
/*
|
||
* From spc4r17 Section 5.7.9: Reserving:
|
||
*
|
||
* If a persistent reservation holder attempts to modify the
|
||
* type or scope of an existing persistent reservation, the
|
||
* command shall be completed with RESERVATION CONFLICT status.
|
||
*/
|
||
if ((pr_res_holder->pr_res_type != type) ||
|
||
(pr_res_holder->pr_res_scope != scope)) {
|
||
struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
|
||
pr_err("SPC-3 PR: Attempted RESERVE from"
|
||
" [%s]: %s trying to change TYPE and/or SCOPE,"
|
||
" while reservation already held by [%s]: %s,"
|
||
" returning RESERVATION_CONFLICT\n",
|
||
cmd->se_tfo->fabric_name,
|
||
se_sess->se_node_acl->initiatorname,
|
||
pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name,
|
||
pr_res_holder->pr_reg_nacl->initiatorname);
|
||
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
ret = TCM_RESERVATION_CONFLICT;
|
||
goto out_put_pr_reg;
|
||
}
|
||
/*
|
||
* From spc4r17 Section 5.7.9: Reserving:
|
||
*
|
||
* If the device server receives a PERSISTENT RESERVE OUT
|
||
* command with RESERVE service action where the TYPE field and
|
||
* the SCOPE field contain the same values as the existing type
|
||
* and scope from a persistent reservation holder, it shall not
|
||
* make any change to the existing persistent reservation and
|
||
* shall completethe command with GOOD status.
|
||
*/
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
ret = 0;
|
||
goto out_put_pr_reg;
|
||
}
|
||
/*
|
||
* Otherwise, our *pr_reg becomes the PR reservation holder for said
|
||
* TYPE/SCOPE. Also set the received scope and type in *pr_reg.
|
||
*/
|
||
pr_reg->pr_res_scope = scope;
|
||
pr_reg->pr_res_type = type;
|
||
pr_reg->pr_res_holder = 1;
|
||
dev->dev_pr_res_holder = pr_reg;
|
||
core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
|
||
|
||
pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
|
||
" reservation holder TYPE: %s ALL_TG_PT: %d\n",
|
||
cmd->se_tfo->fabric_name, core_scsi3_pr_dump_type(type),
|
||
(pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
|
||
pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
|
||
cmd->se_tfo->fabric_name,
|
||
se_sess->se_node_acl->initiatorname,
|
||
i_buf);
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
|
||
if (pr_tmpl->pr_aptpl_active)
|
||
core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
|
||
|
||
ret = 0;
|
||
out_put_pr_reg:
|
||
core_scsi3_put_pr_reg(pr_reg);
|
||
return ret;
|
||
}
|
||
|
||
static sense_reason_t
|
||
core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope,
|
||
u64 res_key)
|
||
{
|
||
switch (type) {
|
||
case PR_TYPE_WRITE_EXCLUSIVE:
|
||
case PR_TYPE_EXCLUSIVE_ACCESS:
|
||
case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
|
||
case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
|
||
case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
|
||
case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
|
||
return core_scsi3_pro_reserve(cmd, type, scope, res_key);
|
||
default:
|
||
pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
|
||
" 0x%02x\n", type);
|
||
return TCM_INVALID_CDB_FIELD;
|
||
}
|
||
}
|
||
|
||
static void __core_scsi3_complete_pro_release(
|
||
struct se_device *dev,
|
||
struct se_node_acl *se_nacl,
|
||
struct t10_pr_registration *pr_reg,
|
||
int explicit,
|
||
int unreg)
|
||
{
|
||
const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
|
||
char i_buf[PR_REG_ISID_ID_LEN] = { };
|
||
int pr_res_type = 0, pr_res_scope = 0;
|
||
|
||
lockdep_assert_held(&dev->dev_reservation_lock);
|
||
|
||
core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
|
||
/*
|
||
* Go ahead and release the current PR reservation holder.
|
||
* If an All Registrants reservation is currently active and
|
||
* a unregister operation is requested, replace the current
|
||
* dev_pr_res_holder with another active registration.
|
||
*/
|
||
if (dev->dev_pr_res_holder) {
|
||
pr_res_type = dev->dev_pr_res_holder->pr_res_type;
|
||
pr_res_scope = dev->dev_pr_res_holder->pr_res_scope;
|
||
dev->dev_pr_res_holder->pr_res_type = 0;
|
||
dev->dev_pr_res_holder->pr_res_scope = 0;
|
||
dev->dev_pr_res_holder->pr_res_holder = 0;
|
||
dev->dev_pr_res_holder = NULL;
|
||
}
|
||
if (!unreg)
|
||
goto out;
|
||
|
||
spin_lock(&dev->t10_pr.registration_lock);
|
||
list_del_init(&pr_reg->pr_reg_list);
|
||
/*
|
||
* If the I_T nexus is a reservation holder, the persistent reservation
|
||
* is of an all registrants type, and the I_T nexus is the last remaining
|
||
* registered I_T nexus, then the device server shall also release the
|
||
* persistent reservation.
|
||
*/
|
||
if (!list_empty(&dev->t10_pr.registration_list) &&
|
||
((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
|
||
(pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) {
|
||
dev->dev_pr_res_holder =
|
||
list_entry(dev->t10_pr.registration_list.next,
|
||
struct t10_pr_registration, pr_reg_list);
|
||
dev->dev_pr_res_holder->pr_res_type = pr_res_type;
|
||
dev->dev_pr_res_holder->pr_res_scope = pr_res_scope;
|
||
dev->dev_pr_res_holder->pr_res_holder = 1;
|
||
}
|
||
spin_unlock(&dev->t10_pr.registration_lock);
|
||
out:
|
||
if (!dev->dev_pr_res_holder) {
|
||
pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
|
||
" reservation holder TYPE: %s ALL_TG_PT: %d\n",
|
||
tfo->fabric_name, (explicit) ? "explicit" :
|
||
"implicit", core_scsi3_pr_dump_type(pr_res_type),
|
||
(pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
|
||
}
|
||
pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
|
||
tfo->fabric_name, se_nacl->initiatorname,
|
||
i_buf);
|
||
/*
|
||
* Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
|
||
*/
|
||
pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
|
||
}
|
||
|
||
static sense_reason_t
|
||
core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope,
|
||
u64 res_key)
|
||
{
|
||
struct se_device *dev = cmd->se_dev;
|
||
struct se_session *se_sess = cmd->se_sess;
|
||
struct se_lun *se_lun = cmd->se_lun;
|
||
struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
|
||
struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
||
sense_reason_t ret = 0;
|
||
|
||
if (!se_sess || !se_lun) {
|
||
pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
|
||
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
||
}
|
||
/*
|
||
* Locate the existing *pr_reg via struct se_node_acl pointers
|
||
*/
|
||
pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
|
||
if (!pr_reg) {
|
||
pr_err("SPC-3 PR: Unable to locate"
|
||
" PR_REGISTERED *pr_reg for RELEASE\n");
|
||
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
||
}
|
||
/*
|
||
* From spc4r17 Section 5.7.11.2 Releasing:
|
||
*
|
||
* If there is no persistent reservation or in response to a persistent
|
||
* reservation release request from a registered I_T nexus that is not a
|
||
* persistent reservation holder (see 5.7.10), the device server shall
|
||
* do the following:
|
||
*
|
||
* a) Not release the persistent reservation, if any;
|
||
* b) Not remove any registrations; and
|
||
* c) Complete the command with GOOD status.
|
||
*/
|
||
spin_lock(&dev->dev_reservation_lock);
|
||
pr_res_holder = dev->dev_pr_res_holder;
|
||
if (!pr_res_holder) {
|
||
/*
|
||
* No persistent reservation, return GOOD status.
|
||
*/
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
goto out_put_pr_reg;
|
||
}
|
||
|
||
if (!is_reservation_holder(pr_res_holder, pr_reg)) {
|
||
/*
|
||
* Release request from a registered I_T nexus that is not a
|
||
* persistent reservation holder. return GOOD status.
|
||
*/
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
goto out_put_pr_reg;
|
||
}
|
||
|
||
/*
|
||
* From spc4r17 Section 5.7.11.2 Releasing:
|
||
*
|
||
* Only the persistent reservation holder (see 5.7.10) is allowed to
|
||
* release a persistent reservation.
|
||
*
|
||
* An application client releases the persistent reservation by issuing
|
||
* a PERSISTENT RESERVE OUT command with RELEASE service action through
|
||
* an I_T nexus that is a persistent reservation holder with the
|
||
* following parameters:
|
||
*
|
||
* a) RESERVATION KEY field set to the value of the reservation key
|
||
* that is registered with the logical unit for the I_T nexus;
|
||
*/
|
||
if (res_key != pr_reg->pr_res_key) {
|
||
pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
|
||
" does not match existing SA REGISTER res_key:"
|
||
" 0x%016Lx\n", res_key, pr_reg->pr_res_key);
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
ret = TCM_RESERVATION_CONFLICT;
|
||
goto out_put_pr_reg;
|
||
}
|
||
/*
|
||
* From spc4r17 Section 5.7.11.2 Releasing and above:
|
||
*
|
||
* b) TYPE field and SCOPE field set to match the persistent
|
||
* reservation being released.
|
||
*/
|
||
if ((pr_res_holder->pr_res_type != type) ||
|
||
(pr_res_holder->pr_res_scope != scope)) {
|
||
struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
|
||
pr_err("SPC-3 PR RELEASE: Attempted to release"
|
||
" reservation from [%s]: %s with different TYPE "
|
||
"and/or SCOPE while reservation already held by"
|
||
" [%s]: %s, returning RESERVATION_CONFLICT\n",
|
||
cmd->se_tfo->fabric_name,
|
||
se_sess->se_node_acl->initiatorname,
|
||
pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name,
|
||
pr_res_holder->pr_reg_nacl->initiatorname);
|
||
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
ret = TCM_RESERVATION_CONFLICT;
|
||
goto out_put_pr_reg;
|
||
}
|
||
/*
|
||
* In response to a persistent reservation release request from the
|
||
* persistent reservation holder the device server shall perform a
|
||
* release by doing the following as an uninterrupted series of actions:
|
||
* a) Release the persistent reservation;
|
||
* b) Not remove any registration(s);
|
||
* c) If the released persistent reservation is a registrants only type
|
||
* or all registrants type persistent reservation,
|
||
* the device server shall establish a unit attention condition for
|
||
* the initiator port associated with every regis-
|
||
* tered I_T nexus other than I_T nexus on which the PERSISTENT
|
||
* RESERVE OUT command with RELEASE service action was received,
|
||
* with the additional sense code set to RESERVATIONS RELEASED; and
|
||
* d) If the persistent reservation is of any other type, the device
|
||
* server shall not establish a unit attention condition.
|
||
*/
|
||
__core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
|
||
pr_reg, 1, 0);
|
||
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
|
||
if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
|
||
(type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
|
||
(type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
|
||
(type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
|
||
/*
|
||
* If no UNIT ATTENTION conditions will be established for
|
||
* PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
|
||
* go ahead and check for APTPL=1 update+write below
|
||
*/
|
||
goto write_aptpl;
|
||
}
|
||
|
||
spin_lock(&pr_tmpl->registration_lock);
|
||
list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
|
||
pr_reg_list) {
|
||
/*
|
||
* Do not establish a UNIT ATTENTION condition
|
||
* for the calling I_T Nexus
|
||
*/
|
||
if (pr_reg_p == pr_reg)
|
||
continue;
|
||
|
||
target_ua_allocate_lun(pr_reg_p->pr_reg_nacl,
|
||
pr_reg_p->pr_res_mapped_lun,
|
||
0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
|
||
}
|
||
spin_unlock(&pr_tmpl->registration_lock);
|
||
|
||
write_aptpl:
|
||
if (pr_tmpl->pr_aptpl_active)
|
||
core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
|
||
|
||
out_put_pr_reg:
|
||
core_scsi3_put_pr_reg(pr_reg);
|
||
return ret;
|
||
}
|
||
|
||
static sense_reason_t
|
||
core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key)
|
||
{
|
||
struct se_device *dev = cmd->se_dev;
|
||
struct se_node_acl *pr_reg_nacl;
|
||
struct se_session *se_sess = cmd->se_sess;
|
||
struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
||
struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
|
||
u64 pr_res_mapped_lun = 0;
|
||
int calling_it_nexus = 0;
|
||
/*
|
||
* Locate the existing *pr_reg via struct se_node_acl pointers
|
||
*/
|
||
pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
|
||
se_sess->se_node_acl, se_sess);
|
||
if (!pr_reg_n) {
|
||
pr_err("SPC-3 PR: Unable to locate"
|
||
" PR_REGISTERED *pr_reg for CLEAR\n");
|
||
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
||
}
|
||
/*
|
||
* From spc4r17 section 5.7.11.6, Clearing:
|
||
*
|
||
* Any application client may release the persistent reservation and
|
||
* remove all registrations from a device server by issuing a
|
||
* PERSISTENT RESERVE OUT command with CLEAR service action through a
|
||
* registered I_T nexus with the following parameter:
|
||
*
|
||
* a) RESERVATION KEY field set to the value of the reservation key
|
||
* that is registered with the logical unit for the I_T nexus.
|
||
*/
|
||
if (res_key != pr_reg_n->pr_res_key) {
|
||
pr_err("SPC-3 PR REGISTER: Received"
|
||
" res_key: 0x%016Lx does not match"
|
||
" existing SA REGISTER res_key:"
|
||
" 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
|
||
core_scsi3_put_pr_reg(pr_reg_n);
|
||
return TCM_RESERVATION_CONFLICT;
|
||
}
|
||
/*
|
||
* a) Release the persistent reservation, if any;
|
||
*/
|
||
spin_lock(&dev->dev_reservation_lock);
|
||
pr_res_holder = dev->dev_pr_res_holder;
|
||
if (pr_res_holder) {
|
||
struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
|
||
__core_scsi3_complete_pro_release(dev, pr_res_nacl,
|
||
pr_res_holder, 0, 0);
|
||
}
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
/*
|
||
* b) Remove all registration(s) (see spc4r17 5.7.7);
|
||
*/
|
||
spin_lock(&pr_tmpl->registration_lock);
|
||
list_for_each_entry_safe(pr_reg, pr_reg_tmp,
|
||
&pr_tmpl->registration_list, pr_reg_list) {
|
||
|
||
calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
|
||
pr_reg_nacl = pr_reg->pr_reg_nacl;
|
||
pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
|
||
__core_scsi3_free_registration(dev, pr_reg, NULL,
|
||
calling_it_nexus);
|
||
/*
|
||
* e) Establish a unit attention condition for the initiator
|
||
* port associated with every registered I_T nexus other
|
||
* than the I_T nexus on which the PERSISTENT RESERVE OUT
|
||
* command with CLEAR service action was received, with the
|
||
* additional sense code set to RESERVATIONS PREEMPTED.
|
||
*/
|
||
if (!calling_it_nexus)
|
||
target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun,
|
||
0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
|
||
}
|
||
spin_unlock(&pr_tmpl->registration_lock);
|
||
|
||
pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
|
||
cmd->se_tfo->fabric_name);
|
||
|
||
core_scsi3_update_and_write_aptpl(cmd->se_dev, false);
|
||
|
||
core_scsi3_pr_generation(dev);
|
||
return 0;
|
||
}
|
||
|
||
static void __core_scsi3_complete_pro_preempt(
|
||
struct se_device *dev,
|
||
struct t10_pr_registration *pr_reg,
|
||
struct list_head *preempt_and_abort_list,
|
||
int type,
|
||
int scope,
|
||
enum preempt_type preempt_type)
|
||
{
|
||
struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
|
||
const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
|
||
char i_buf[PR_REG_ISID_ID_LEN] = { };
|
||
|
||
lockdep_assert_held(&dev->dev_reservation_lock);
|
||
|
||
core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
|
||
/*
|
||
* Do an implicit RELEASE of the existing reservation.
|
||
*/
|
||
if (dev->dev_pr_res_holder)
|
||
__core_scsi3_complete_pro_release(dev, nacl,
|
||
dev->dev_pr_res_holder, 0, 0);
|
||
|
||
dev->dev_pr_res_holder = pr_reg;
|
||
pr_reg->pr_res_holder = 1;
|
||
pr_reg->pr_res_type = type;
|
||
pr_reg->pr_res_scope = scope;
|
||
|
||
pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
|
||
" reservation holder TYPE: %s ALL_TG_PT: %d\n",
|
||
tfo->fabric_name, (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
|
||
core_scsi3_pr_dump_type(type),
|
||
(pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
|
||
pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
|
||
tfo->fabric_name, (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
|
||
nacl->initiatorname, i_buf);
|
||
/*
|
||
* For PREEMPT_AND_ABORT, add the preempting reservation's
|
||
* struct t10_pr_registration to the list that will be compared
|
||
* against received CDBs..
|
||
*/
|
||
if (preempt_and_abort_list)
|
||
list_add_tail(&pr_reg->pr_reg_abort_list,
|
||
preempt_and_abort_list);
|
||
}
|
||
|
||
static void core_scsi3_release_preempt_and_abort(
|
||
struct list_head *preempt_and_abort_list,
|
||
struct t10_pr_registration *pr_reg_holder)
|
||
{
|
||
struct t10_pr_registration *pr_reg, *pr_reg_tmp;
|
||
|
||
list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
|
||
pr_reg_abort_list) {
|
||
|
||
list_del(&pr_reg->pr_reg_abort_list);
|
||
if (pr_reg_holder == pr_reg)
|
||
continue;
|
||
if (pr_reg->pr_res_holder) {
|
||
pr_warn("pr_reg->pr_res_holder still set\n");
|
||
continue;
|
||
}
|
||
|
||
pr_reg->pr_reg_deve = NULL;
|
||
pr_reg->pr_reg_nacl = NULL;
|
||
kmem_cache_free(t10_pr_reg_cache, pr_reg);
|
||
}
|
||
}
|
||
|
||
static sense_reason_t
|
||
core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key,
|
||
u64 sa_res_key, enum preempt_type preempt_type)
|
||
{
|
||
struct se_device *dev = cmd->se_dev;
|
||
struct se_node_acl *pr_reg_nacl;
|
||
struct se_session *se_sess = cmd->se_sess;
|
||
LIST_HEAD(preempt_and_abort_list);
|
||
struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
|
||
struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
||
u64 pr_res_mapped_lun = 0;
|
||
int all_reg = 0, calling_it_nexus = 0;
|
||
bool sa_res_key_unmatched = sa_res_key != 0;
|
||
int prh_type = 0, prh_scope = 0;
|
||
|
||
if (!se_sess)
|
||
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
||
|
||
pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
|
||
se_sess);
|
||
if (!pr_reg_n) {
|
||
pr_err("SPC-3 PR: Unable to locate"
|
||
" PR_REGISTERED *pr_reg for PREEMPT%s\n",
|
||
(preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "");
|
||
return TCM_RESERVATION_CONFLICT;
|
||
}
|
||
if (pr_reg_n->pr_res_key != res_key) {
|
||
core_scsi3_put_pr_reg(pr_reg_n);
|
||
return TCM_RESERVATION_CONFLICT;
|
||
}
|
||
if (scope != PR_SCOPE_LU_SCOPE) {
|
||
pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
|
||
core_scsi3_put_pr_reg(pr_reg_n);
|
||
return TCM_INVALID_PARAMETER_LIST;
|
||
}
|
||
|
||
spin_lock(&dev->dev_reservation_lock);
|
||
pr_res_holder = dev->dev_pr_res_holder;
|
||
if (pr_res_holder &&
|
||
((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
|
||
(pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
|
||
all_reg = 1;
|
||
|
||
if (!all_reg && !sa_res_key) {
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
core_scsi3_put_pr_reg(pr_reg_n);
|
||
return TCM_INVALID_PARAMETER_LIST;
|
||
}
|
||
/*
|
||
* From spc4r17, section 5.7.11.4.4 Removing Registrations:
|
||
*
|
||
* If the SERVICE ACTION RESERVATION KEY field does not identify a
|
||
* persistent reservation holder or there is no persistent reservation
|
||
* holder (i.e., there is no persistent reservation), then the device
|
||
* server shall perform a preempt by doing the following in an
|
||
* uninterrupted series of actions. (See below..)
|
||
*/
|
||
if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
|
||
/*
|
||
* No existing or SA Reservation Key matching reservations..
|
||
*
|
||
* PROUT SA PREEMPT with All Registrant type reservations are
|
||
* allowed to be processed without a matching SA Reservation Key
|
||
*/
|
||
spin_lock(&pr_tmpl->registration_lock);
|
||
list_for_each_entry_safe(pr_reg, pr_reg_tmp,
|
||
&pr_tmpl->registration_list, pr_reg_list) {
|
||
/*
|
||
* Removing of registrations in non all registrants
|
||
* type reservations without a matching SA reservation
|
||
* key.
|
||
*
|
||
* a) Remove the registrations for all I_T nexuses
|
||
* specified by the SERVICE ACTION RESERVATION KEY
|
||
* field;
|
||
* b) Ignore the contents of the SCOPE and TYPE fields;
|
||
* c) Process tasks as defined in 5.7.1; and
|
||
* d) Establish a unit attention condition for the
|
||
* initiator port associated with every I_T nexus
|
||
* that lost its registration other than the I_T
|
||
* nexus on which the PERSISTENT RESERVE OUT command
|
||
* was received, with the additional sense code set
|
||
* to REGISTRATIONS PREEMPTED.
|
||
*/
|
||
if (!all_reg) {
|
||
if (pr_reg->pr_res_key != sa_res_key)
|
||
continue;
|
||
sa_res_key_unmatched = false;
|
||
|
||
calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
|
||
pr_reg_nacl = pr_reg->pr_reg_nacl;
|
||
pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
|
||
__core_scsi3_free_registration(dev, pr_reg,
|
||
(preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
|
||
NULL, calling_it_nexus);
|
||
} else {
|
||
/*
|
||
* Case for any existing all registrants type
|
||
* reservation, follow logic in spc4r17 section
|
||
* 5.7.11.4 Preempting, Table 52 and Figure 7.
|
||
*
|
||
* For a ZERO SA Reservation key, release
|
||
* all other registrations and do an implicit
|
||
* release of active persistent reservation.
|
||
*
|
||
* For a non-ZERO SA Reservation key, only
|
||
* release the matching reservation key from
|
||
* registrations.
|
||
*/
|
||
if ((sa_res_key) &&
|
||
(pr_reg->pr_res_key != sa_res_key))
|
||
continue;
|
||
sa_res_key_unmatched = false;
|
||
|
||
calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
|
||
if (calling_it_nexus)
|
||
continue;
|
||
|
||
pr_reg_nacl = pr_reg->pr_reg_nacl;
|
||
pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
|
||
__core_scsi3_free_registration(dev, pr_reg,
|
||
(preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
|
||
NULL, 0);
|
||
}
|
||
if (!calling_it_nexus)
|
||
target_ua_allocate_lun(pr_reg_nacl,
|
||
pr_res_mapped_lun, 0x2A,
|
||
ASCQ_2AH_REGISTRATIONS_PREEMPTED);
|
||
}
|
||
spin_unlock(&pr_tmpl->registration_lock);
|
||
/*
|
||
* If a PERSISTENT RESERVE OUT with a PREEMPT service action or
|
||
* a PREEMPT AND ABORT service action sets the SERVICE ACTION
|
||
* RESERVATION KEY field to a value that does not match any
|
||
* registered reservation key, then the device server shall
|
||
* complete the command with RESERVATION CONFLICT status.
|
||
*/
|
||
if (sa_res_key_unmatched) {
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
core_scsi3_put_pr_reg(pr_reg_n);
|
||
return TCM_RESERVATION_CONFLICT;
|
||
}
|
||
/*
|
||
* For an existing all registrants type reservation
|
||
* with a zero SA rservation key, preempt the existing
|
||
* reservation with the new PR type and scope.
|
||
*/
|
||
if (pr_res_holder && all_reg && !(sa_res_key)) {
|
||
__core_scsi3_complete_pro_preempt(dev, pr_reg_n,
|
||
(preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
|
||
type, scope, preempt_type);
|
||
|
||
if (preempt_type == PREEMPT_AND_ABORT)
|
||
core_scsi3_release_preempt_and_abort(
|
||
&preempt_and_abort_list, pr_reg_n);
|
||
}
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
|
||
if (pr_tmpl->pr_aptpl_active)
|
||
core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
|
||
|
||
core_scsi3_put_pr_reg(pr_reg_n);
|
||
core_scsi3_pr_generation(cmd->se_dev);
|
||
return 0;
|
||
}
|
||
/*
|
||
* The PREEMPTing SA reservation key matches that of the
|
||
* existing persistent reservation, first, we check if
|
||
* we are preempting our own reservation.
|
||
* From spc4r17, section 5.7.11.4.3 Preempting
|
||
* persistent reservations and registration handling
|
||
*
|
||
* If an all registrants persistent reservation is not
|
||
* present, it is not an error for the persistent
|
||
* reservation holder to preempt itself (i.e., a
|
||
* PERSISTENT RESERVE OUT with a PREEMPT service action
|
||
* or a PREEMPT AND ABORT service action with the
|
||
* SERVICE ACTION RESERVATION KEY value equal to the
|
||
* persistent reservation holder's reservation key that
|
||
* is received from the persistent reservation holder).
|
||
* In that case, the device server shall establish the
|
||
* new persistent reservation and maintain the
|
||
* registration.
|
||
*/
|
||
prh_type = pr_res_holder->pr_res_type;
|
||
prh_scope = pr_res_holder->pr_res_scope;
|
||
/*
|
||
* If the SERVICE ACTION RESERVATION KEY field identifies a
|
||
* persistent reservation holder (see 5.7.10), the device
|
||
* server shall perform a preempt by doing the following as
|
||
* an uninterrupted series of actions:
|
||
*
|
||
* a) Release the persistent reservation for the holder
|
||
* identified by the SERVICE ACTION RESERVATION KEY field;
|
||
*/
|
||
if (pr_reg_n != pr_res_holder)
|
||
__core_scsi3_complete_pro_release(dev,
|
||
pr_res_holder->pr_reg_nacl,
|
||
dev->dev_pr_res_holder, 0, 0);
|
||
/*
|
||
* b) Remove the registrations for all I_T nexuses identified
|
||
* by the SERVICE ACTION RESERVATION KEY field, except the
|
||
* I_T nexus that is being used for the PERSISTENT RESERVE
|
||
* OUT command. If an all registrants persistent reservation
|
||
* is present and the SERVICE ACTION RESERVATION KEY field
|
||
* is set to zero, then all registrations shall be removed
|
||
* except for that of the I_T nexus that is being used for
|
||
* the PERSISTENT RESERVE OUT command;
|
||
*/
|
||
spin_lock(&pr_tmpl->registration_lock);
|
||
list_for_each_entry_safe(pr_reg, pr_reg_tmp,
|
||
&pr_tmpl->registration_list, pr_reg_list) {
|
||
|
||
calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
|
||
if (calling_it_nexus)
|
||
continue;
|
||
|
||
if (pr_reg->pr_res_key != sa_res_key)
|
||
continue;
|
||
|
||
pr_reg_nacl = pr_reg->pr_reg_nacl;
|
||
pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
|
||
__core_scsi3_free_registration(dev, pr_reg,
|
||
(preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
|
||
calling_it_nexus);
|
||
/*
|
||
* e) Establish a unit attention condition for the initiator
|
||
* port associated with every I_T nexus that lost its
|
||
* persistent reservation and/or registration, with the
|
||
* additional sense code set to REGISTRATIONS PREEMPTED;
|
||
*/
|
||
target_ua_allocate_lun(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
|
||
ASCQ_2AH_REGISTRATIONS_PREEMPTED);
|
||
}
|
||
spin_unlock(&pr_tmpl->registration_lock);
|
||
/*
|
||
* c) Establish a persistent reservation for the preempting
|
||
* I_T nexus using the contents of the SCOPE and TYPE fields;
|
||
*/
|
||
__core_scsi3_complete_pro_preempt(dev, pr_reg_n,
|
||
(preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
|
||
type, scope, preempt_type);
|
||
/*
|
||
* d) Process tasks as defined in 5.7.1;
|
||
* e) See above..
|
||
* f) If the type or scope has changed, then for every I_T nexus
|
||
* whose reservation key was not removed, except for the I_T
|
||
* nexus on which the PERSISTENT RESERVE OUT command was
|
||
* received, the device server shall establish a unit
|
||
* attention condition for the initiator port associated with
|
||
* that I_T nexus, with the additional sense code set to
|
||
* RESERVATIONS RELEASED. If the type or scope have not
|
||
* changed, then no unit attention condition(s) shall be
|
||
* established for this reason.
|
||
*/
|
||
if ((prh_type != type) || (prh_scope != scope)) {
|
||
spin_lock(&pr_tmpl->registration_lock);
|
||
list_for_each_entry_safe(pr_reg, pr_reg_tmp,
|
||
&pr_tmpl->registration_list, pr_reg_list) {
|
||
|
||
calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
|
||
if (calling_it_nexus)
|
||
continue;
|
||
|
||
target_ua_allocate_lun(pr_reg->pr_reg_nacl,
|
||
pr_reg->pr_res_mapped_lun, 0x2A,
|
||
ASCQ_2AH_RESERVATIONS_RELEASED);
|
||
}
|
||
spin_unlock(&pr_tmpl->registration_lock);
|
||
}
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
/*
|
||
* Call LUN_RESET logic upon list of struct t10_pr_registration,
|
||
* All received CDBs for the matching existing reservation and
|
||
* registrations undergo ABORT_TASK logic.
|
||
*
|
||
* From there, core_scsi3_release_preempt_and_abort() will
|
||
* release every registration in the list (which have already
|
||
* been removed from the primary pr_reg list), except the
|
||
* new persistent reservation holder, the calling Initiator Port.
|
||
*/
|
||
if (preempt_type == PREEMPT_AND_ABORT) {
|
||
core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
|
||
core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
|
||
pr_reg_n);
|
||
}
|
||
|
||
if (pr_tmpl->pr_aptpl_active)
|
||
core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
|
||
|
||
core_scsi3_put_pr_reg(pr_reg_n);
|
||
core_scsi3_pr_generation(cmd->se_dev);
|
||
return 0;
|
||
}
|
||
|
||
static sense_reason_t
|
||
core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope,
|
||
u64 res_key, u64 sa_res_key, enum preempt_type preempt_type)
|
||
{
|
||
switch (type) {
|
||
case PR_TYPE_WRITE_EXCLUSIVE:
|
||
case PR_TYPE_EXCLUSIVE_ACCESS:
|
||
case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
|
||
case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
|
||
case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
|
||
case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
|
||
return core_scsi3_pro_preempt(cmd, type, scope, res_key,
|
||
sa_res_key, preempt_type);
|
||
default:
|
||
pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
|
||
" Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type);
|
||
return TCM_INVALID_CDB_FIELD;
|
||
}
|
||
}
|
||
|
||
|
||
static sense_reason_t
|
||
core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key,
|
||
u64 sa_res_key, int aptpl, int unreg)
|
||
{
|
||
struct se_session *se_sess = cmd->se_sess;
|
||
struct se_device *dev = cmd->se_dev;
|
||
struct se_dev_entry *dest_se_deve = NULL;
|
||
struct se_lun *se_lun = cmd->se_lun, *tmp_lun;
|
||
struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
|
||
struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
|
||
const struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
|
||
struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
|
||
struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
||
unsigned char *buf;
|
||
const unsigned char *initiator_str;
|
||
char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN] = { };
|
||
u32 tid_len, tmp_tid_len;
|
||
int new_reg = 0, type, scope, matching_iname;
|
||
sense_reason_t ret;
|
||
unsigned short rtpi;
|
||
unsigned char proto_ident;
|
||
|
||
if (!se_sess || !se_lun) {
|
||
pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
|
||
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
||
}
|
||
|
||
se_tpg = se_sess->se_tpg;
|
||
tf_ops = se_tpg->se_tpg_tfo;
|
||
/*
|
||
* Follow logic from spc4r17 Section 5.7.8, Table 50 --
|
||
* Register behaviors for a REGISTER AND MOVE service action
|
||
*
|
||
* Locate the existing *pr_reg via struct se_node_acl pointers
|
||
*/
|
||
pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
|
||
se_sess);
|
||
if (!pr_reg) {
|
||
pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
|
||
" *pr_reg for REGISTER_AND_MOVE\n");
|
||
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
||
}
|
||
/*
|
||
* The provided reservation key much match the existing reservation key
|
||
* provided during this initiator's I_T nexus registration.
|
||
*/
|
||
if (res_key != pr_reg->pr_res_key) {
|
||
pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
|
||
" res_key: 0x%016Lx does not match existing SA REGISTER"
|
||
" res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
|
||
ret = TCM_RESERVATION_CONFLICT;
|
||
goto out_put_pr_reg;
|
||
}
|
||
/*
|
||
* The service active reservation key needs to be non zero
|
||
*/
|
||
if (!sa_res_key) {
|
||
pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
|
||
" sa_res_key\n");
|
||
ret = TCM_INVALID_PARAMETER_LIST;
|
||
goto out_put_pr_reg;
|
||
}
|
||
|
||
/*
|
||
* Determine the Relative Target Port Identifier where the reservation
|
||
* will be moved to for the TransportID containing SCSI initiator WWN
|
||
* information.
|
||
*/
|
||
buf = transport_kmap_data_sg(cmd);
|
||
if (!buf) {
|
||
ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
|
||
goto out_put_pr_reg;
|
||
}
|
||
|
||
rtpi = get_unaligned_be16(&buf[18]);
|
||
tid_len = get_unaligned_be32(&buf[20]);
|
||
transport_kunmap_data_sg(cmd);
|
||
buf = NULL;
|
||
|
||
if ((tid_len + 24) != cmd->data_length) {
|
||
pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
|
||
" does not equal CDB data_length: %u\n", tid_len,
|
||
cmd->data_length);
|
||
ret = TCM_INVALID_PARAMETER_LIST;
|
||
goto out_put_pr_reg;
|
||
}
|
||
|
||
spin_lock(&dev->se_port_lock);
|
||
list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) {
|
||
if (tmp_lun->lun_rtpi != rtpi)
|
||
continue;
|
||
dest_se_tpg = tmp_lun->lun_tpg;
|
||
dest_tf_ops = dest_se_tpg->se_tpg_tfo;
|
||
if (!dest_tf_ops)
|
||
continue;
|
||
|
||
atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count);
|
||
spin_unlock(&dev->se_port_lock);
|
||
|
||
if (core_scsi3_tpg_depend_item(dest_se_tpg)) {
|
||
pr_err("core_scsi3_tpg_depend_item() failed"
|
||
" for dest_se_tpg\n");
|
||
atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count);
|
||
ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
||
goto out_put_pr_reg;
|
||
}
|
||
|
||
spin_lock(&dev->se_port_lock);
|
||
break;
|
||
}
|
||
spin_unlock(&dev->se_port_lock);
|
||
|
||
if (!dest_se_tpg || !dest_tf_ops) {
|
||
pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
|
||
" fabric ops from Relative Target Port Identifier:"
|
||
" %hu\n", rtpi);
|
||
ret = TCM_INVALID_PARAMETER_LIST;
|
||
goto out_put_pr_reg;
|
||
}
|
||
|
||
buf = transport_kmap_data_sg(cmd);
|
||
if (!buf) {
|
||
ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
|
||
goto out_put_pr_reg;
|
||
}
|
||
proto_ident = (buf[24] & 0x0f);
|
||
|
||
pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
|
||
" 0x%02x\n", proto_ident);
|
||
|
||
if (proto_ident != dest_se_tpg->proto_id) {
|
||
pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
|
||
" proto_ident: 0x%02x does not match ident: 0x%02x"
|
||
" from fabric: %s\n", proto_ident,
|
||
dest_se_tpg->proto_id,
|
||
dest_tf_ops->fabric_name);
|
||
ret = TCM_INVALID_PARAMETER_LIST;
|
||
goto out;
|
||
}
|
||
initiator_str = target_parse_pr_out_transport_id(dest_se_tpg,
|
||
&buf[24], &tmp_tid_len, &iport_ptr);
|
||
if (!initiator_str) {
|
||
pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
|
||
" initiator_str from Transport ID\n");
|
||
ret = TCM_INVALID_PARAMETER_LIST;
|
||
goto out;
|
||
}
|
||
|
||
transport_kunmap_data_sg(cmd);
|
||
buf = NULL;
|
||
|
||
pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
|
||
" %s\n", dest_tf_ops->fabric_name, (iport_ptr != NULL) ?
|
||
"port" : "device", initiator_str, (iport_ptr != NULL) ?
|
||
iport_ptr : "");
|
||
/*
|
||
* If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
|
||
* action specifies a TransportID that is the same as the initiator port
|
||
* of the I_T nexus for the command received, then the command shall
|
||
* be terminated with CHECK CONDITION status, with the sense key set to
|
||
* ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
|
||
* IN PARAMETER LIST.
|
||
*/
|
||
pr_reg_nacl = pr_reg->pr_reg_nacl;
|
||
matching_iname = (!strcmp(initiator_str,
|
||
pr_reg_nacl->initiatorname)) ? 1 : 0;
|
||
if (!matching_iname)
|
||
goto after_iport_check;
|
||
|
||
if (!iport_ptr || !pr_reg->isid_present_at_reg) {
|
||
pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
|
||
" matches: %s on received I_T Nexus\n", initiator_str,
|
||
pr_reg_nacl->initiatorname);
|
||
ret = TCM_INVALID_PARAMETER_LIST;
|
||
goto out;
|
||
}
|
||
if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
|
||
pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
|
||
" matches: %s %s on received I_T Nexus\n",
|
||
initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
|
||
pr_reg->pr_reg_isid);
|
||
ret = TCM_INVALID_PARAMETER_LIST;
|
||
goto out;
|
||
}
|
||
after_iport_check:
|
||
/*
|
||
* Locate the destination struct se_node_acl from the received Transport ID
|
||
*/
|
||
mutex_lock(&dest_se_tpg->acl_node_mutex);
|
||
dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
|
||
initiator_str);
|
||
if (dest_node_acl)
|
||
atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
|
||
mutex_unlock(&dest_se_tpg->acl_node_mutex);
|
||
|
||
if (!dest_node_acl) {
|
||
pr_err("Unable to locate %s dest_node_acl for"
|
||
" TransportID%s\n", dest_tf_ops->fabric_name,
|
||
initiator_str);
|
||
ret = TCM_INVALID_PARAMETER_LIST;
|
||
goto out;
|
||
}
|
||
|
||
if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
|
||
pr_err("core_scsi3_nodeacl_depend_item() for"
|
||
" dest_node_acl\n");
|
||
atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
|
||
dest_node_acl = NULL;
|
||
ret = TCM_INVALID_PARAMETER_LIST;
|
||
goto out;
|
||
}
|
||
|
||
pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
|
||
" %s from TransportID\n", dest_tf_ops->fabric_name,
|
||
dest_node_acl->initiatorname);
|
||
|
||
/*
|
||
* Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
|
||
* PORT IDENTIFIER.
|
||
*/
|
||
dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
|
||
if (!dest_se_deve) {
|
||
pr_err("Unable to locate %s dest_se_deve from RTPI:"
|
||
" %hu\n", dest_tf_ops->fabric_name, rtpi);
|
||
ret = TCM_INVALID_PARAMETER_LIST;
|
||
goto out;
|
||
}
|
||
|
||
if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
|
||
pr_err("core_scsi3_lunacl_depend_item() failed\n");
|
||
kref_put(&dest_se_deve->pr_kref, target_pr_kref_release);
|
||
dest_se_deve = NULL;
|
||
ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
||
goto out;
|
||
}
|
||
|
||
pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
|
||
" ACL for dest_se_deve->mapped_lun: %llu\n",
|
||
dest_tf_ops->fabric_name, dest_node_acl->initiatorname,
|
||
dest_se_deve->mapped_lun);
|
||
|
||
/*
|
||
* A persistent reservation needs to already existing in order to
|
||
* successfully complete the REGISTER_AND_MOVE service action..
|
||
*/
|
||
spin_lock(&dev->dev_reservation_lock);
|
||
pr_res_holder = dev->dev_pr_res_holder;
|
||
if (!pr_res_holder) {
|
||
pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
|
||
" currently held\n");
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
ret = TCM_INVALID_CDB_FIELD;
|
||
goto out;
|
||
}
|
||
/*
|
||
* The received on I_T Nexus must be the reservation holder.
|
||
*
|
||
* From spc4r17 section 5.7.8 Table 50 --
|
||
* Register behaviors for a REGISTER AND MOVE service action
|
||
*/
|
||
if (!is_reservation_holder(pr_res_holder, pr_reg)) {
|
||
pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
|
||
" Nexus is not reservation holder\n");
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
ret = TCM_RESERVATION_CONFLICT;
|
||
goto out;
|
||
}
|
||
/*
|
||
* From spc4r17 section 5.7.8: registering and moving reservation
|
||
*
|
||
* If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
|
||
* action is received and the established persistent reservation is a
|
||
* Write Exclusive - All Registrants type or Exclusive Access -
|
||
* All Registrants type reservation, then the command shall be completed
|
||
* with RESERVATION CONFLICT status.
|
||
*/
|
||
if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
|
||
(pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
|
||
pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
|
||
" reservation for type: %s\n",
|
||
core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
ret = TCM_RESERVATION_CONFLICT;
|
||
goto out;
|
||
}
|
||
pr_res_nacl = pr_res_holder->pr_reg_nacl;
|
||
/*
|
||
* b) Ignore the contents of the (received) SCOPE and TYPE fields;
|
||
*/
|
||
type = pr_res_holder->pr_res_type;
|
||
scope = pr_res_holder->pr_res_type;
|
||
/*
|
||
* c) Associate the reservation key specified in the SERVICE ACTION
|
||
* RESERVATION KEY field with the I_T nexus specified as the
|
||
* destination of the register and move, where:
|
||
* A) The I_T nexus is specified by the TransportID and the
|
||
* RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
|
||
* B) Regardless of the TransportID format used, the association for
|
||
* the initiator port is based on either the initiator port name
|
||
* (see 3.1.71) on SCSI transport protocols where port names are
|
||
* required or the initiator port identifier (see 3.1.70) on SCSI
|
||
* transport protocols where port names are not required;
|
||
* d) Register the reservation key specified in the SERVICE ACTION
|
||
* RESERVATION KEY field;
|
||
* e) Retain the reservation key specified in the SERVICE ACTION
|
||
* RESERVATION KEY field and associated information;
|
||
*
|
||
* Also, It is not an error for a REGISTER AND MOVE service action to
|
||
* register an I_T nexus that is already registered with the same
|
||
* reservation key or a different reservation key.
|
||
*/
|
||
dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
|
||
iport_ptr);
|
||
if (!dest_pr_reg) {
|
||
struct se_lun *dest_lun = rcu_dereference_check(dest_se_deve->se_lun,
|
||
kref_read(&dest_se_deve->pr_kref) != 0);
|
||
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
if (core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl,
|
||
dest_lun, dest_se_deve, dest_se_deve->mapped_lun,
|
||
iport_ptr, sa_res_key, 0, aptpl, 2, 1)) {
|
||
ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
|
||
goto out;
|
||
}
|
||
spin_lock(&dev->dev_reservation_lock);
|
||
dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
|
||
iport_ptr);
|
||
new_reg = 1;
|
||
}
|
||
/*
|
||
* f) Release the persistent reservation for the persistent reservation
|
||
* holder (i.e., the I_T nexus on which the
|
||
*/
|
||
__core_scsi3_complete_pro_release(dev, pr_res_nacl,
|
||
dev->dev_pr_res_holder, 0, 0);
|
||
/*
|
||
* g) Move the persistent reservation to the specified I_T nexus using
|
||
* the same scope and type as the persistent reservation released in
|
||
* item f); and
|
||
*/
|
||
dev->dev_pr_res_holder = dest_pr_reg;
|
||
dest_pr_reg->pr_res_holder = 1;
|
||
dest_pr_reg->pr_res_type = type;
|
||
pr_reg->pr_res_scope = scope;
|
||
core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
|
||
/*
|
||
* Increment PRGeneration for existing registrations..
|
||
*/
|
||
if (!new_reg)
|
||
dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
|
||
pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
|
||
" created new reservation holder TYPE: %s on object RTPI:"
|
||
" %hu PRGeneration: 0x%08x\n", dest_tf_ops->fabric_name,
|
||
core_scsi3_pr_dump_type(type), rtpi,
|
||
dest_pr_reg->pr_res_generation);
|
||
pr_debug("SPC-3 PR Successfully moved reservation from"
|
||
" %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
|
||
tf_ops->fabric_name, pr_reg_nacl->initiatorname,
|
||
i_buf, dest_tf_ops->fabric_name,
|
||
dest_node_acl->initiatorname, (iport_ptr != NULL) ?
|
||
iport_ptr : "");
|
||
/*
|
||
* It is now safe to release configfs group dependencies for destination
|
||
* of Transport ID Initiator Device/Port Identifier
|
||
*/
|
||
core_scsi3_lunacl_undepend_item(dest_se_deve);
|
||
core_scsi3_nodeacl_undepend_item(dest_node_acl);
|
||
core_scsi3_tpg_undepend_item(dest_se_tpg);
|
||
/*
|
||
* h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
|
||
* nexus on which PERSISTENT RESERVE OUT command was received.
|
||
*/
|
||
if (unreg) {
|
||
spin_lock(&pr_tmpl->registration_lock);
|
||
__core_scsi3_free_registration(dev, pr_reg, NULL, 1);
|
||
spin_unlock(&pr_tmpl->registration_lock);
|
||
} else
|
||
core_scsi3_put_pr_reg(pr_reg);
|
||
|
||
core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl);
|
||
|
||
core_scsi3_put_pr_reg(dest_pr_reg);
|
||
return 0;
|
||
out:
|
||
if (buf)
|
||
transport_kunmap_data_sg(cmd);
|
||
if (dest_se_deve)
|
||
core_scsi3_lunacl_undepend_item(dest_se_deve);
|
||
if (dest_node_acl)
|
||
core_scsi3_nodeacl_undepend_item(dest_node_acl);
|
||
core_scsi3_tpg_undepend_item(dest_se_tpg);
|
||
|
||
out_put_pr_reg:
|
||
core_scsi3_put_pr_reg(pr_reg);
|
||
return ret;
|
||
}
|
||
|
||
/*
|
||
* See spc4r17 section 6.14 Table 170
|
||
*/
|
||
sense_reason_t
|
||
target_scsi3_emulate_pr_out(struct se_cmd *cmd)
|
||
{
|
||
struct se_device *dev = cmd->se_dev;
|
||
unsigned char *cdb = &cmd->t_task_cdb[0];
|
||
unsigned char *buf;
|
||
u64 res_key, sa_res_key;
|
||
int sa, scope, type, aptpl;
|
||
int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
|
||
sense_reason_t ret;
|
||
|
||
/*
|
||
* Following spc2r20 5.5.1 Reservations overview:
|
||
*
|
||
* If a logical unit has been reserved by any RESERVE command and is
|
||
* still reserved by any initiator, all PERSISTENT RESERVE IN and all
|
||
* PERSISTENT RESERVE OUT commands shall conflict regardless of
|
||
* initiator or service action and shall terminate with a RESERVATION
|
||
* CONFLICT status.
|
||
*/
|
||
if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
|
||
pr_err("Received PERSISTENT_RESERVE CDB while legacy"
|
||
" SPC-2 reservation is held, returning"
|
||
" RESERVATION_CONFLICT\n");
|
||
return TCM_RESERVATION_CONFLICT;
|
||
}
|
||
|
||
/*
|
||
* FIXME: A NULL struct se_session pointer means an this is not coming from
|
||
* a $FABRIC_MOD's nexus, but from internal passthrough ops.
|
||
*/
|
||
if (!cmd->se_sess)
|
||
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
||
|
||
if (cmd->data_length < 24) {
|
||
pr_warn("SPC-PR: Received PR OUT parameter list"
|
||
" length too small: %u\n", cmd->data_length);
|
||
return TCM_PARAMETER_LIST_LENGTH_ERROR;
|
||
}
|
||
|
||
/*
|
||
* From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
|
||
*/
|
||
sa = (cdb[1] & 0x1f);
|
||
scope = (cdb[2] & 0xf0);
|
||
type = (cdb[2] & 0x0f);
|
||
|
||
buf = transport_kmap_data_sg(cmd);
|
||
if (!buf)
|
||
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
||
|
||
/*
|
||
* From PERSISTENT_RESERVE_OUT parameter list (payload)
|
||
*/
|
||
res_key = get_unaligned_be64(&buf[0]);
|
||
sa_res_key = get_unaligned_be64(&buf[8]);
|
||
/*
|
||
* REGISTER_AND_MOVE uses a different SA parameter list containing
|
||
* SCSI TransportIDs.
|
||
*/
|
||
if (sa != PRO_REGISTER_AND_MOVE) {
|
||
spec_i_pt = (buf[20] & 0x08);
|
||
all_tg_pt = (buf[20] & 0x04);
|
||
aptpl = (buf[20] & 0x01);
|
||
} else {
|
||
aptpl = (buf[17] & 0x01);
|
||
unreg = (buf[17] & 0x02);
|
||
}
|
||
/*
|
||
* If the backend device has been configured to force APTPL metadata
|
||
* write-out, go ahead and propigate aptpl=1 down now.
|
||
*/
|
||
if (dev->dev_attrib.force_pr_aptpl)
|
||
aptpl = 1;
|
||
|
||
transport_kunmap_data_sg(cmd);
|
||
buf = NULL;
|
||
|
||
/*
|
||
* SPEC_I_PT=1 is only valid for Service action: REGISTER
|
||
*/
|
||
if (spec_i_pt && (sa != PRO_REGISTER))
|
||
return TCM_INVALID_PARAMETER_LIST;
|
||
|
||
/*
|
||
* From spc4r17 section 6.14:
|
||
*
|
||
* If the SPEC_I_PT bit is set to zero, the service action is not
|
||
* REGISTER AND MOVE, and the parameter list length is not 24, then
|
||
* the command shall be terminated with CHECK CONDITION status, with
|
||
* the sense key set to ILLEGAL REQUEST, and the additional sense
|
||
* code set to PARAMETER LIST LENGTH ERROR.
|
||
*/
|
||
if (!spec_i_pt && (sa != PRO_REGISTER_AND_MOVE) &&
|
||
(cmd->data_length != 24)) {
|
||
pr_warn("SPC-PR: Received PR OUT illegal parameter"
|
||
" list length: %u\n", cmd->data_length);
|
||
return TCM_PARAMETER_LIST_LENGTH_ERROR;
|
||
}
|
||
|
||
/*
|
||
* (core_scsi3_emulate_pro_* function parameters
|
||
* are defined by spc4r17 Table 174:
|
||
* PERSISTENT_RESERVE_OUT service actions and valid parameters.
|
||
*/
|
||
switch (sa) {
|
||
case PRO_REGISTER:
|
||
ret = core_scsi3_emulate_pro_register(cmd,
|
||
res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER);
|
||
break;
|
||
case PRO_RESERVE:
|
||
ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
|
||
break;
|
||
case PRO_RELEASE:
|
||
ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
|
||
break;
|
||
case PRO_CLEAR:
|
||
ret = core_scsi3_emulate_pro_clear(cmd, res_key);
|
||
break;
|
||
case PRO_PREEMPT:
|
||
ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
|
||
res_key, sa_res_key, PREEMPT);
|
||
break;
|
||
case PRO_PREEMPT_AND_ABORT:
|
||
ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
|
||
res_key, sa_res_key, PREEMPT_AND_ABORT);
|
||
break;
|
||
case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
|
||
ret = core_scsi3_emulate_pro_register(cmd,
|
||
0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY);
|
||
break;
|
||
case PRO_REGISTER_AND_MOVE:
|
||
ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
|
||
sa_res_key, aptpl, unreg);
|
||
break;
|
||
default:
|
||
pr_err("Unknown PERSISTENT_RESERVE_OUT service"
|
||
" action: 0x%02x\n", sa);
|
||
return TCM_INVALID_CDB_FIELD;
|
||
}
|
||
|
||
if (!ret)
|
||
target_complete_cmd(cmd, GOOD);
|
||
return ret;
|
||
}
|
||
|
||
/*
|
||
* PERSISTENT_RESERVE_IN Service Action READ_KEYS
|
||
*
|
||
* See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
|
||
*/
|
||
static sense_reason_t
|
||
core_scsi3_pri_read_keys(struct se_cmd *cmd)
|
||
{
|
||
struct se_device *dev = cmd->se_dev;
|
||
struct t10_pr_registration *pr_reg;
|
||
unsigned char *buf;
|
||
u32 add_len = 0, off = 8;
|
||
|
||
if (cmd->data_length < 8) {
|
||
pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
|
||
" too small\n", cmd->data_length);
|
||
return TCM_INVALID_CDB_FIELD;
|
||
}
|
||
|
||
buf = transport_kmap_data_sg(cmd);
|
||
if (!buf)
|
||
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
||
|
||
put_unaligned_be32(dev->t10_pr.pr_generation, buf);
|
||
|
||
spin_lock(&dev->t10_pr.registration_lock);
|
||
list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
|
||
pr_reg_list) {
|
||
/*
|
||
* Check for overflow of 8byte PRI READ_KEYS payload and
|
||
* next reservation key list descriptor.
|
||
*/
|
||
if (off + 8 <= cmd->data_length) {
|
||
put_unaligned_be64(pr_reg->pr_res_key, &buf[off]);
|
||
off += 8;
|
||
}
|
||
/*
|
||
* SPC5r17: 6.16.2 READ KEYS service action
|
||
* The ADDITIONAL LENGTH field indicates the number of bytes in
|
||
* the Reservation key list. The contents of the ADDITIONAL
|
||
* LENGTH field are not altered based on the allocation length
|
||
*/
|
||
add_len += 8;
|
||
}
|
||
spin_unlock(&dev->t10_pr.registration_lock);
|
||
|
||
put_unaligned_be32(add_len, &buf[4]);
|
||
target_set_cmd_data_length(cmd, 8 + add_len);
|
||
|
||
transport_kunmap_data_sg(cmd);
|
||
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
|
||
*
|
||
* See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
|
||
*/
|
||
static sense_reason_t
|
||
core_scsi3_pri_read_reservation(struct se_cmd *cmd)
|
||
{
|
||
struct se_device *dev = cmd->se_dev;
|
||
struct t10_pr_registration *pr_reg;
|
||
unsigned char *buf;
|
||
u64 pr_res_key;
|
||
u32 add_len = 0;
|
||
|
||
if (cmd->data_length < 8) {
|
||
pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
|
||
" too small\n", cmd->data_length);
|
||
return TCM_INVALID_CDB_FIELD;
|
||
}
|
||
|
||
buf = transport_kmap_data_sg(cmd);
|
||
if (!buf)
|
||
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
||
|
||
put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]);
|
||
|
||
spin_lock(&dev->dev_reservation_lock);
|
||
pr_reg = dev->dev_pr_res_holder;
|
||
if (pr_reg) {
|
||
/*
|
||
* Set the Additional Length to 16 when a reservation is held
|
||
*/
|
||
add_len = 16;
|
||
put_unaligned_be32(add_len, &buf[4]);
|
||
|
||
if (cmd->data_length < 22)
|
||
goto err;
|
||
|
||
/*
|
||
* Set the Reservation key.
|
||
*
|
||
* From spc4r17, section 5.7.10:
|
||
* A persistent reservation holder has its reservation key
|
||
* returned in the parameter data from a PERSISTENT
|
||
* RESERVE IN command with READ RESERVATION service action as
|
||
* follows:
|
||
* a) For a persistent reservation of the type Write Exclusive
|
||
* - All Registrants or Exclusive Access All Regitrants,
|
||
* the reservation key shall be set to zero; or
|
||
* b) For all other persistent reservation types, the
|
||
* reservation key shall be set to the registered
|
||
* reservation key for the I_T nexus that holds the
|
||
* persistent reservation.
|
||
*/
|
||
if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
|
||
(pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
|
||
pr_res_key = 0;
|
||
else
|
||
pr_res_key = pr_reg->pr_res_key;
|
||
|
||
put_unaligned_be64(pr_res_key, &buf[8]);
|
||
/*
|
||
* Set the SCOPE and TYPE
|
||
*/
|
||
buf[21] = (pr_reg->pr_res_scope & 0xf0) |
|
||
(pr_reg->pr_res_type & 0x0f);
|
||
}
|
||
|
||
target_set_cmd_data_length(cmd, 8 + add_len);
|
||
|
||
err:
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
transport_kunmap_data_sg(cmd);
|
||
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
|
||
*
|
||
* See spc4r17 section 6.13.4 Table 165
|
||
*/
|
||
static sense_reason_t
|
||
core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
|
||
{
|
||
struct se_device *dev = cmd->se_dev;
|
||
struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
||
unsigned char *buf;
|
||
u16 len = 8; /* Hardcoded to 8. */
|
||
|
||
if (cmd->data_length < 6) {
|
||
pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
|
||
" %u too small\n", cmd->data_length);
|
||
return TCM_INVALID_CDB_FIELD;
|
||
}
|
||
|
||
buf = transport_kmap_data_sg(cmd);
|
||
if (!buf)
|
||
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
||
|
||
put_unaligned_be16(len, &buf[0]);
|
||
buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
|
||
buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
|
||
buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
|
||
buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
|
||
/*
|
||
* We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
|
||
* set the TMV: Task Mask Valid bit.
|
||
*/
|
||
buf[3] |= 0x80;
|
||
/*
|
||
* Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
|
||
*/
|
||
buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
|
||
/*
|
||
* PTPL_A: Persistence across Target Power Loss Active bit
|
||
*/
|
||
if (pr_tmpl->pr_aptpl_active)
|
||
buf[3] |= 0x01;
|
||
/*
|
||
* Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
|
||
*/
|
||
buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
|
||
buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
|
||
buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
|
||
buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
|
||
buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
|
||
buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
|
||
|
||
target_set_cmd_data_length(cmd, len);
|
||
|
||
transport_kunmap_data_sg(cmd);
|
||
|
||
return 0;
|
||
}
|
||
|
||
/*
|
||
* PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
|
||
*
|
||
* See spc4r17 section 6.13.5 Table 168 and 169
|
||
*/
|
||
static sense_reason_t
|
||
core_scsi3_pri_read_full_status(struct se_cmd *cmd)
|
||
{
|
||
struct se_device *dev = cmd->se_dev;
|
||
struct se_node_acl *se_nacl;
|
||
struct se_portal_group *se_tpg;
|
||
struct t10_pr_registration *pr_reg, *pr_reg_tmp;
|
||
struct t10_reservation *pr_tmpl = &dev->t10_pr;
|
||
unsigned char *buf;
|
||
u32 add_desc_len = 0, add_len = 0;
|
||
u32 off = 8; /* off into first Full Status descriptor */
|
||
int format_code = 0, pr_res_type = 0, pr_res_scope = 0;
|
||
int exp_desc_len, desc_len;
|
||
bool all_reg = false;
|
||
|
||
if (cmd->data_length < 8) {
|
||
pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
|
||
" too small\n", cmd->data_length);
|
||
return TCM_INVALID_CDB_FIELD;
|
||
}
|
||
|
||
buf = transport_kmap_data_sg(cmd);
|
||
if (!buf)
|
||
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
||
|
||
put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]);
|
||
|
||
spin_lock(&dev->dev_reservation_lock);
|
||
if (dev->dev_pr_res_holder) {
|
||
struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder;
|
||
|
||
if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
|
||
pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) {
|
||
all_reg = true;
|
||
pr_res_type = pr_holder->pr_res_type;
|
||
pr_res_scope = pr_holder->pr_res_scope;
|
||
}
|
||
}
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
|
||
spin_lock(&pr_tmpl->registration_lock);
|
||
list_for_each_entry_safe(pr_reg, pr_reg_tmp,
|
||
&pr_tmpl->registration_list, pr_reg_list) {
|
||
|
||
se_nacl = pr_reg->pr_reg_nacl;
|
||
se_tpg = pr_reg->pr_reg_nacl->se_tpg;
|
||
add_desc_len = 0;
|
||
|
||
atomic_inc_mb(&pr_reg->pr_res_holders);
|
||
spin_unlock(&pr_tmpl->registration_lock);
|
||
/*
|
||
* Determine expected length of $FABRIC_MOD specific
|
||
* TransportID full status descriptor..
|
||
*/
|
||
exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg,
|
||
&format_code);
|
||
if (exp_desc_len < 0 ||
|
||
exp_desc_len + add_len > cmd->data_length) {
|
||
pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
|
||
" out of buffer: %d\n", cmd->data_length);
|
||
spin_lock(&pr_tmpl->registration_lock);
|
||
atomic_dec_mb(&pr_reg->pr_res_holders);
|
||
break;
|
||
}
|
||
/*
|
||
* Set RESERVATION KEY
|
||
*/
|
||
put_unaligned_be64(pr_reg->pr_res_key, &buf[off]);
|
||
off += 8;
|
||
off += 4; /* Skip Over Reserved area */
|
||
|
||
/*
|
||
* Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
|
||
*/
|
||
if (pr_reg->pr_reg_all_tg_pt)
|
||
buf[off] = 0x02;
|
||
/*
|
||
* The struct se_lun pointer will be present for the
|
||
* reservation holder for PR_HOLDER bit.
|
||
*
|
||
* Also, if this registration is the reservation
|
||
* holder or there is an All Registrants reservation
|
||
* active, fill in SCOPE and TYPE in the next byte.
|
||
*/
|
||
if (pr_reg->pr_res_holder) {
|
||
buf[off++] |= 0x01;
|
||
buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
|
||
(pr_reg->pr_res_type & 0x0f);
|
||
} else if (all_reg) {
|
||
buf[off++] |= 0x01;
|
||
buf[off++] = (pr_res_scope & 0xf0) |
|
||
(pr_res_type & 0x0f);
|
||
} else {
|
||
off += 2;
|
||
}
|
||
|
||
off += 4; /* Skip over reserved area */
|
||
/*
|
||
* From spc4r17 6.3.15:
|
||
*
|
||
* If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
|
||
* IDENTIFIER field contains the relative port identifier (see
|
||
* 3.1.120) of the target port that is part of the I_T nexus
|
||
* described by this full status descriptor. If the ALL_TG_PT
|
||
* bit is set to one, the contents of the RELATIVE TARGET PORT
|
||
* IDENTIFIER field are not defined by this standard.
|
||
*/
|
||
if (!pr_reg->pr_reg_all_tg_pt) {
|
||
u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi;
|
||
|
||
put_unaligned_be16(sep_rtpi, &buf[off]);
|
||
off += 2;
|
||
} else
|
||
off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
|
||
|
||
buf[off+4] = se_tpg->proto_id;
|
||
|
||
/*
|
||
* Now, have the $FABRIC_MOD fill in the transport ID.
|
||
*/
|
||
desc_len = target_get_pr_transport_id(se_nacl, pr_reg,
|
||
&format_code, &buf[off+4]);
|
||
|
||
spin_lock(&pr_tmpl->registration_lock);
|
||
atomic_dec_mb(&pr_reg->pr_res_holders);
|
||
|
||
if (desc_len < 0)
|
||
break;
|
||
/*
|
||
* Set the ADDITIONAL DESCRIPTOR LENGTH
|
||
*/
|
||
put_unaligned_be32(desc_len, &buf[off]);
|
||
off += 4;
|
||
/*
|
||
* Size of full desctipor header minus TransportID
|
||
* containing $FABRIC_MOD specific) initiator device/port
|
||
* WWN information.
|
||
*
|
||
* See spc4r17 Section 6.13.5 Table 169
|
||
*/
|
||
add_desc_len = (24 + desc_len);
|
||
|
||
off += desc_len;
|
||
add_len += add_desc_len;
|
||
}
|
||
spin_unlock(&pr_tmpl->registration_lock);
|
||
/*
|
||
* Set ADDITIONAL_LENGTH
|
||
*/
|
||
put_unaligned_be32(add_len, &buf[4]);
|
||
target_set_cmd_data_length(cmd, 8 + add_len);
|
||
|
||
transport_kunmap_data_sg(cmd);
|
||
|
||
return 0;
|
||
}
|
||
|
||
sense_reason_t
|
||
target_scsi3_emulate_pr_in(struct se_cmd *cmd)
|
||
{
|
||
sense_reason_t ret;
|
||
|
||
/*
|
||
* Following spc2r20 5.5.1 Reservations overview:
|
||
*
|
||
* If a logical unit has been reserved by any RESERVE command and is
|
||
* still reserved by any initiator, all PERSISTENT RESERVE IN and all
|
||
* PERSISTENT RESERVE OUT commands shall conflict regardless of
|
||
* initiator or service action and shall terminate with a RESERVATION
|
||
* CONFLICT status.
|
||
*/
|
||
if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
|
||
pr_err("Received PERSISTENT_RESERVE CDB while legacy"
|
||
" SPC-2 reservation is held, returning"
|
||
" RESERVATION_CONFLICT\n");
|
||
return TCM_RESERVATION_CONFLICT;
|
||
}
|
||
|
||
switch (cmd->t_task_cdb[1] & 0x1f) {
|
||
case PRI_READ_KEYS:
|
||
ret = core_scsi3_pri_read_keys(cmd);
|
||
break;
|
||
case PRI_READ_RESERVATION:
|
||
ret = core_scsi3_pri_read_reservation(cmd);
|
||
break;
|
||
case PRI_REPORT_CAPABILITIES:
|
||
ret = core_scsi3_pri_report_capabilities(cmd);
|
||
break;
|
||
case PRI_READ_FULL_STATUS:
|
||
ret = core_scsi3_pri_read_full_status(cmd);
|
||
break;
|
||
default:
|
||
pr_err("Unknown PERSISTENT_RESERVE_IN service"
|
||
" action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
|
||
return TCM_INVALID_CDB_FIELD;
|
||
}
|
||
|
||
if (!ret)
|
||
target_complete_cmd(cmd, GOOD);
|
||
return ret;
|
||
}
|
||
|
||
sense_reason_t
|
||
target_check_reservation(struct se_cmd *cmd)
|
||
{
|
||
struct se_device *dev = cmd->se_dev;
|
||
sense_reason_t ret;
|
||
|
||
if (!cmd->se_sess)
|
||
return 0;
|
||
if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
|
||
return 0;
|
||
if (!dev->dev_attrib.emulate_pr)
|
||
return 0;
|
||
if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
|
||
return 0;
|
||
|
||
spin_lock(&dev->dev_reservation_lock);
|
||
if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
|
||
ret = target_scsi2_reservation_check(cmd);
|
||
else
|
||
ret = target_scsi3_pr_reservation_check(cmd);
|
||
spin_unlock(&dev->dev_reservation_lock);
|
||
|
||
return ret;
|
||
}
|