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4115 lines
122 KiB
4115 lines
122 KiB
// 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 <[email protected]> |
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* |
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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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|
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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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|
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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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/* |
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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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|
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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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|
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snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid); |
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} |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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if (!dev->reservation_holder || !sess) |
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return 0; |
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|
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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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|
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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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|
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return 0; |
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} |
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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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|
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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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|
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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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|
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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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|
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return 0; |
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} |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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if (rc < 0) |
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return TCM_RESERVATION_CONFLICT; |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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", |
||
(cdb[1] & 0x1f)); |
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return -EINVAL; |
||
} |
||
break; |
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case ACCESS_CONTROL_IN: |
||
case ACCESS_CONTROL_OUT: |
||
case INQUIRY: |
||
case LOG_SENSE: |
||
case SERVICE_ACTION_IN_12: |
||
case REPORT_LUNS: |
||
case REQUEST_SENSE: |
||
case PERSISTENT_RESERVE_IN: |
||
ret = 0; /*/ Allowed CDBs */ |
||
break; |
||
default: |
||
other_cdb = 1; |
||
break; |
||
} |
||
/* |
||
* Case where the CDB is explicitly allowed in the above switch |
||
* statement. |
||
*/ |
||
if (!ret && !other_cdb) { |
||
pr_debug("Allowing explicit CDB: 0x%02x for %s" |
||
" reservation holder\n", cdb[0], |
||
core_scsi3_pr_dump_type(pr_reg_type)); |
||
|
||
return ret; |
||
} |
||
/* |
||
* Check if write exclusive initiator ports *NOT* holding the |
||
* 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]; |
||
|
||
memset(i_buf, 0, 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; |
||
|
||
memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN); |
||
memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN); |
||
/* |
||
* 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]; |
||
|
||
memset(&i_buf[0], 0, 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], *isid_ptr = NULL; |
||
|
||
if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) { |
||
memset(&buf[0], 0, PR_REG_ISID_LEN); |
||
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); |
||
|
||
memset(i_buf, 0, PR_REG_ISID_ID_LEN); |
||
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: %hu\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: %hu\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], *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) { |
||
memset(&isid_buf[0], 0, PR_REG_ISID_LEN); |
||
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; |
||
|
||
memset(i_buf, 0, PR_REG_ISID_ID_LEN); |
||
|
||
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); |
||
|
||
memset(i_buf, 0, PR_REG_ISID_ID_LEN); |
||
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); |
||
|
||
memset(i_buf, 0, PR_REG_ISID_ID_LEN); |
||
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; |
||
} |
||
|
||
memset(i_buf, 0, PR_REG_ISID_ID_LEN); |
||
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; |
||
}
|
||
|