| /******************************************************************************* |
| * Filename: target_core_pr.c |
| * |
| * This file contains SPC-3 compliant persistent reservations and |
| * legacy SPC-2 reservations with compatible reservation handling (CRH=1) |
| * |
| * (c) Copyright 2009-2013 Datera, Inc. |
| * |
| * Nicholas A. Bellinger <nab@kernel.org> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| * |
| ******************************************************************************/ |
| |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include <linux/list.h> |
| #include <linux/vmalloc.h> |
| #include <linux/file.h> |
| #include <linux/fcntl.h> |
| #include <linux/fs.h> |
| #include <scsi/scsi_proto.h> |
| #include <asm/unaligned.h> |
| |
| #include <target/target_core_base.h> |
| #include <target/target_core_backend.h> |
| #include <target/target_core_fabric.h> |
| |
| #include "target_core_internal.h" |
| #include "target_core_pr.h" |
| #include "target_core_ua.h" |
| |
| /* |
| * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT) |
| */ |
| struct pr_transport_id_holder { |
| struct t10_pr_registration *dest_pr_reg; |
| struct se_portal_group *dest_tpg; |
| struct se_node_acl *dest_node_acl; |
| struct se_dev_entry *dest_se_deve; |
| struct list_head dest_list; |
| }; |
| |
| void core_pr_dump_initiator_port( |
| struct t10_pr_registration *pr_reg, |
| char *buf, |
| u32 size) |
| { |
| if (!pr_reg->isid_present_at_reg) |
| buf[0] = '\0'; |
| |
| snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid); |
| } |
| |
| enum register_type { |
| REGISTER, |
| REGISTER_AND_IGNORE_EXISTING_KEY, |
| REGISTER_AND_MOVE, |
| }; |
| |
| enum preempt_type { |
| PREEMPT, |
| PREEMPT_AND_ABORT, |
| }; |
| |
| static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *, |
| struct t10_pr_registration *, int, int); |
| |
| static int is_reservation_holder( |
| struct t10_pr_registration *pr_res_holder, |
| struct t10_pr_registration *pr_reg) |
| { |
| int pr_res_type; |
| |
| if (pr_res_holder) { |
| pr_res_type = pr_res_holder->pr_res_type; |
| |
| return pr_res_holder == pr_reg || |
| pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG || |
| pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG; |
| } |
| return 0; |
| } |
| |
| static sense_reason_t |
| target_scsi2_reservation_check(struct se_cmd *cmd) |
| { |
| struct se_device *dev = cmd->se_dev; |
| struct se_session *sess = cmd->se_sess; |
| |
| switch (cmd->t_task_cdb[0]) { |
| case INQUIRY: |
| case RELEASE: |
| case RELEASE_10: |
| return 0; |
| default: |
| break; |
| } |
| |
| if (!dev->dev_reserved_node_acl || !sess) |
| return 0; |
| |
| if (dev->dev_reserved_node_acl != sess->se_node_acl) |
| return TCM_RESERVATION_CONFLICT; |
| |
| if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { |
| if (dev->dev_res_bin_isid != sess->sess_bin_isid) |
| return TCM_RESERVATION_CONFLICT; |
| } |
| |
| return 0; |
| } |
| |
| static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *, |
| struct se_node_acl *, struct se_session *); |
| static void core_scsi3_put_pr_reg(struct t10_pr_registration *); |
| |
| static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd) |
| { |
| struct se_session *se_sess = cmd->se_sess; |
| struct se_device *dev = cmd->se_dev; |
| struct t10_pr_registration *pr_reg; |
| struct t10_reservation *pr_tmpl = &dev->t10_pr; |
| int conflict = 0; |
| |
| pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl, |
| se_sess); |
| if (pr_reg) { |
| /* |
| * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE |
| * behavior |
| * |
| * A RESERVE(6) or RESERVE(10) command shall complete with GOOD |
| * status, but no reservation shall be established and the |
| * persistent reservation shall not be changed, if the command |
| * is received from a) and b) below. |
| * |
| * A RELEASE(6) or RELEASE(10) command shall complete with GOOD |
| * status, but the persistent reservation shall not be released, |
| * if the command is received from a) and b) |
| * |
| * a) An I_T nexus that is a persistent reservation holder; or |
| * b) An I_T nexus that is registered if a registrants only or |
| * all registrants type persistent reservation is present. |
| * |
| * In all other cases, a RESERVE(6) command, RESERVE(10) command, |
| * RELEASE(6) command, or RELEASE(10) command shall be processed |
| * as defined in SPC-2. |
| */ |
| if (pr_reg->pr_res_holder) { |
| core_scsi3_put_pr_reg(pr_reg); |
| return 1; |
| } |
| if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) || |
| (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) || |
| (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) || |
| (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) { |
| core_scsi3_put_pr_reg(pr_reg); |
| return 1; |
| } |
| core_scsi3_put_pr_reg(pr_reg); |
| conflict = 1; |
| } else { |
| /* |
| * Following spc2r20 5.5.1 Reservations overview: |
| * |
| * If a logical unit has executed a PERSISTENT RESERVE OUT |
| * command with the REGISTER or the REGISTER AND IGNORE |
| * EXISTING KEY service action and is still registered by any |
| * initiator, all RESERVE commands and all RELEASE commands |
| * regardless of initiator shall conflict and shall terminate |
| * with a RESERVATION CONFLICT status. |
| */ |
| spin_lock(&pr_tmpl->registration_lock); |
| conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1; |
| spin_unlock(&pr_tmpl->registration_lock); |
| } |
| |
| if (conflict) { |
| pr_err("Received legacy SPC-2 RESERVE/RELEASE" |
| " while active SPC-3 registrations exist," |
| " returning RESERVATION_CONFLICT\n"); |
| return -EBUSY; |
| } |
| |
| return 0; |
| } |
| |
| sense_reason_t |
| target_scsi2_reservation_release(struct se_cmd *cmd) |
| { |
| struct se_device *dev = cmd->se_dev; |
| struct se_session *sess = cmd->se_sess; |
| struct se_portal_group *tpg; |
| int rc; |
| |
| if (!sess || !sess->se_tpg) |
| goto out; |
| rc = target_check_scsi2_reservation_conflict(cmd); |
| if (rc == 1) |
| goto out; |
| if (rc < 0) |
| return TCM_RESERVATION_CONFLICT; |
| |
| spin_lock(&dev->dev_reservation_lock); |
| if (!dev->dev_reserved_node_acl || !sess) |
| goto out_unlock; |
| |
| if (dev->dev_reserved_node_acl != sess->se_node_acl) |
| goto out_unlock; |
| |
| if (dev->dev_res_bin_isid != sess->sess_bin_isid) |
| goto out_unlock; |
| |
| dev->dev_reserved_node_acl = NULL; |
| dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS; |
| if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) { |
| dev->dev_res_bin_isid = 0; |
| dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID; |
| } |
| tpg = sess->se_tpg; |
| pr_debug("SCSI-2 Released reservation for %s LUN: %llu ->" |
| " MAPPED LUN: %llu for %s\n", |
| tpg->se_tpg_tfo->get_fabric_name(), |
| cmd->se_lun->unpacked_lun, cmd->orig_fe_lun, |
| sess->se_node_acl->initiatorname); |
| |
| out_unlock: |
| spin_unlock(&dev->dev_reservation_lock); |
| out: |
| target_complete_cmd(cmd, GOOD); |
| return 0; |
| } |
| |
| sense_reason_t |
| target_scsi2_reservation_reserve(struct se_cmd *cmd) |
| { |
| struct se_device *dev = cmd->se_dev; |
| struct se_session *sess = cmd->se_sess; |
| struct se_portal_group *tpg; |
| sense_reason_t ret = 0; |
| int rc; |
| |
| if ((cmd->t_task_cdb[1] & 0x01) && |
| (cmd->t_task_cdb[1] & 0x02)) { |
| pr_err("LongIO and Obsolete Bits set, returning ILLEGAL_REQUEST\n"); |
| return TCM_UNSUPPORTED_SCSI_OPCODE; |
| } |
| /* |
| * This is currently the case for target_core_mod passthrough struct se_cmd |
| * ops |
| */ |
| if (!sess || !sess->se_tpg) |
| goto out; |
| rc = target_check_scsi2_reservation_conflict(cmd); |
| if (rc == 1) |
| goto out; |
| |
| if (rc < 0) |
| return TCM_RESERVATION_CONFLICT; |
| |
| tpg = sess->se_tpg; |
| spin_lock(&dev->dev_reservation_lock); |
| if (dev->dev_reserved_node_acl && |
| (dev->dev_reserved_node_acl != sess->se_node_acl)) { |
| pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n", |
| tpg->se_tpg_tfo->get_fabric_name()); |
| pr_err("Original reserver LUN: %llu %s\n", |
| cmd->se_lun->unpacked_lun, |
| dev->dev_reserved_node_acl->initiatorname); |
| pr_err("Current attempt - LUN: %llu -> MAPPED LUN: %llu" |
| " from %s \n", cmd->se_lun->unpacked_lun, |
| cmd->orig_fe_lun, |
| sess->se_node_acl->initiatorname); |
| ret = TCM_RESERVATION_CONFLICT; |
| goto out_unlock; |
| } |
| |
| dev->dev_reserved_node_acl = sess->se_node_acl; |
| dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS; |
| if (sess->sess_bin_isid != 0) { |
| dev->dev_res_bin_isid = sess->sess_bin_isid; |
| dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID; |
| } |
| pr_debug("SCSI-2 Reserved %s LUN: %llu -> MAPPED LUN: %llu" |
| " for %s\n", tpg->se_tpg_tfo->get_fabric_name(), |
| cmd->se_lun->unpacked_lun, cmd->orig_fe_lun, |
| sess->se_node_acl->initiatorname); |
| |
| out_unlock: |
| spin_unlock(&dev->dev_reservation_lock); |
| out: |
| if (!ret) |
| target_complete_cmd(cmd, GOOD); |
| return ret; |
| } |
| |
| |
| /* |
| * Begin SPC-3/SPC-4 Persistent Reservations emulation support |
| * |
| * This function is called by those initiator ports who are *NOT* |
| * the active PR reservation holder when a reservation is present. |
| */ |
| static int core_scsi3_pr_seq_non_holder(struct se_cmd *cmd, u32 pr_reg_type, |
| bool isid_mismatch) |
| { |
| unsigned char *cdb = cmd->t_task_cdb; |
| struct se_session *se_sess = cmd->se_sess; |
| struct se_node_acl *nacl = se_sess->se_node_acl; |
| int other_cdb = 0; |
| int registered_nexus = 0, ret = 1; /* Conflict by default */ |
| int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */ |
| int we = 0; /* Write Exclusive */ |
| int legacy = 0; /* Act like a legacy device and return |
| * RESERVATION CONFLICT on some CDBs */ |
| |
| if (isid_mismatch) { |
| registered_nexus = 0; |
| } else { |
| struct se_dev_entry *se_deve; |
| |
| rcu_read_lock(); |
| se_deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun); |
| if (se_deve) |
| registered_nexus = test_bit(DEF_PR_REG_ACTIVE, |
| &se_deve->deve_flags); |
| rcu_read_unlock(); |
| } |
| |
| switch (pr_reg_type) { |
| case PR_TYPE_WRITE_EXCLUSIVE: |
| we = 1; |
| case PR_TYPE_EXCLUSIVE_ACCESS: |
| /* |
| * Some commands are only allowed for the persistent reservation |
| * holder. |
| */ |
| break; |
| case PR_TYPE_WRITE_EXCLUSIVE_REGONLY: |
| we = 1; |
| case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY: |
| /* |
| * Some commands are only allowed for registered I_T Nexuses. |
| */ |
| reg_only = 1; |
| break; |
| case PR_TYPE_WRITE_EXCLUSIVE_ALLREG: |
| we = 1; |
| case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG: |
| /* |
| * Each registered I_T Nexus is a reservation holder. |
| */ |
| all_reg = 1; |
| break; |
| default: |
| return -EINVAL; |
| } |
| /* |
| * Referenced from spc4r17 table 45 for *NON* PR holder access |
| */ |
| switch (cdb[0]) { |
| case SECURITY_PROTOCOL_IN: |
| if (registered_nexus) |
| return 0; |
| ret = (we) ? 0 : 1; |
| break; |
| case MODE_SENSE: |
| case MODE_SENSE_10: |
| case READ_ATTRIBUTE: |
| case READ_BUFFER: |
| case RECEIVE_DIAGNOSTIC: |
| if (legacy) { |
| ret = 1; |
| break; |
| } |
| if (registered_nexus) { |
| ret = 0; |
| break; |
| } |
| ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ |
| break; |
| case PERSISTENT_RESERVE_OUT: |
| /* |
| * This follows PERSISTENT_RESERVE_OUT service actions that |
| * are allowed in the presence of various reservations. |
| * See spc4r17, table 46 |
| */ |
| switch (cdb[1] & 0x1f) { |
| case PRO_CLEAR: |
| case PRO_PREEMPT: |
| case PRO_PREEMPT_AND_ABORT: |
| ret = (registered_nexus) ? 0 : 1; |
| break; |
| case PRO_REGISTER: |
| case PRO_REGISTER_AND_IGNORE_EXISTING_KEY: |
| ret = 0; |
| break; |
| case PRO_REGISTER_AND_MOVE: |
| case PRO_RESERVE: |
| ret = 1; |
| break; |
| case PRO_RELEASE: |
| ret = (registered_nexus) ? 0 : 1; |
| break; |
| default: |
| pr_err("Unknown PERSISTENT_RESERVE_OUT service" |
| " action: 0x%02x\n", cdb[1] & 0x1f); |
| return -EINVAL; |
| } |
| break; |
| case RELEASE: |
| case RELEASE_10: |
| /* Handled by CRH=1 in target_scsi2_reservation_release() */ |
| ret = 0; |
| break; |
| case RESERVE: |
| case RESERVE_10: |
| /* Handled by CRH=1 in target_scsi2_reservation_reserve() */ |
| ret = 0; |
| break; |
| case TEST_UNIT_READY: |
| ret = (legacy) ? 1 : 0; /* Conflict for legacy */ |
| break; |
| case MAINTENANCE_IN: |
| switch (cdb[1] & 0x1f) { |
| case MI_MANAGEMENT_PROTOCOL_IN: |
| if (registered_nexus) { |
| ret = 0; |
| break; |
| } |
| ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ |
| break; |
| case MI_REPORT_SUPPORTED_OPERATION_CODES: |
| case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS: |
| if (legacy) { |
| ret = 1; |
| break; |
| } |
| if (registered_nexus) { |
| ret = 0; |
| break; |
| } |
| ret = (we) ? 0 : 1; /* Allowed Write Exclusive */ |
| break; |
| case MI_REPORT_ALIASES: |
| case MI_REPORT_IDENTIFYING_INFORMATION: |
| case MI_REPORT_PRIORITY: |
| case MI_REPORT_TARGET_PGS: |
| case MI_REPORT_TIMESTAMP: |
| ret = 0; /* Allowed */ |
| break; |
| default: |
| pr_err("Unknown MI Service Action: 0x%02x\n", |
| (cdb[1] & 0x1f)); |
| return -EINVAL; |
| } |
| break; |
| 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, |
| atomic_read(&deve_tmp->pr_kref.refcount) != 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->get_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->get_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->get_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->get_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->get_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->get_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; |
| struct se_portal_group *tpg; |
| |
| 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; |
| |
| tpg = pr_reg->pr_reg_nacl->se_tpg; |
| /* |
| * If this registration does NOT contain a fabric provided |
| * ISID, then we have found a match. |
| */ |
| if (!pr_reg->isid_present_at_reg) { |
| /* |
| * 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 != NULL) { |
| if (dev->dev_attrib.enforce_pr_isids) |
| continue; |
| } |
| 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; |
| } |
| |
| /* |
| * Called with struct t10_reservation->registration_lock held. |
| */ |
| 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]; |
| |
| 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->get_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->get_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->get_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->get_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, |
| atomic_read(&se_deve->pr_kref.refcount) != 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, |
| atomic_read(&se_deve->pr_kref.refcount) != 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_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| } |
| 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_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| } |
| tidh_new->dest_pr_reg = local_pr_reg; |
| /* |
| * The local I_T nexus does not hold any configfs dependances, |
| * so we set tidh_new->dest_se_deve to NULL to prevent the |
| * configfs_undepend_item() calls in the tid_dest_list loops below. |
| */ |
| tidh_new->dest_se_deve = NULL; |
| 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_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 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 = (buf[24] & 0xff) << 24; |
| tpdl |= (buf[25] & 0xff) << 16; |
| tpdl |= (buf[26] & 0xff) << 8; |
| tpdl |= buf[27] & 0xff; |
| |
| 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; |
| |
| i_str = target_parse_pr_out_transport_id(tmp_tpg, |
| (const char *)ptr, &tid_len, &iport_ptr); |
| if (!i_str) |
| continue; |
| |
| 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->get_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->get_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->get_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->get_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, |
| atomic_read(&dest_se_deve->pr_kref.refcount) != 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_INVALID_PARAMETER_LIST; |
| 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->get_fabric_name(), |
| dest_node_acl->initiatorname, i_buf, (dest_se_deve) ? |
| dest_se_deve->mapped_lun : 0); |
| |
| if (!dest_se_deve) { |
| kref_put(&local_pr_reg->pr_reg_deve->pr_kref, |
| target_pr_kref_release); |
| continue; |
| } |
| core_scsi3_lunacl_undepend_item(dest_se_deve); |
| 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) { |
| 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); |
| /* |
| * 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); |
| |
| if (!dest_se_deve) { |
| kref_put(&local_pr_reg->pr_reg_deve->pr_kref, |
| target_pr_kref_release); |
| continue; |
| } |
| core_scsi3_lunacl_undepend_item(dest_se_deve); |
| 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->get_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->get_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->get_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[512]; |
| u32 pr_aptpl_buf_len; |
| int ret; |
| |
| memset(path, 0, 512); |
| |
| if (strlen(&wwn->unit_serial[0]) >= 512) { |
| pr_err("WWN value for struct se_device does not fit" |
| " into path buffer\n"); |
| return -EMSGSIZE; |
| } |
| |
| snprintf(path, 512, "%s/pr/aptpl_%s", db_root, &wwn->unit_serial[0]); |
| file = filp_open(path, flags, 0600); |
| if (IS_ERR(file)) { |
| pr_err("filp_open(%s) for APTPL metadata" |
| " failed\n", 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, 0); |
| |
| if (ret < 0) |
| pr_debug("Error writing APTPL metadata file: %s\n", path); |
| fput(file); |
| |
| 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_INVALID_PARAMETER_LIST; |
| } |
| } 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->get_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->get_fabric_name(), |
| se_sess->se_node_acl->initiatorname, |
| pr_res_nacl->se_tpg->se_tpg_tfo->get_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->get_fabric_name(), |
| se_sess->se_node_acl->initiatorname, |
| pr_res_nacl->se_tpg->se_tpg_tfo->get_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->get_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->get_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; |
| } |
| } |
| |
| /* |
| * Called with struct se_device->dev_reservation_lock held. |
| */ |
| 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; |
| |
| 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->get_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->get_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->get_fabric_name(), |
| se_sess->se_node_acl->initiatorname, |
| pr_res_nacl->se_tpg->se_tpg_tfo->get_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->get_fabric_name()); |
| |
| core_scsi3_update_and_write_aptpl(cmd->se_dev, false); |
| |
| core_scsi3_pr_generation(dev); |
| return 0; |
| } |
| |
| /* |
| * Called with struct se_device->dev_reservation_lock held. |
| */ |
| 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]; |
| |
| 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->get_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->get_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_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| goto out_put_pr_reg; |
| } |
| |
| rtpi = (buf[18] & 0xff) << 8; |
| rtpi |= buf[19] & 0xff; |
| tid_len = (buf[20] & 0xff) << 24; |
| tid_len |= (buf[21] & 0xff) << 16; |
| tid_len |= (buf[22] & 0xff) << 8; |
| tid_len |= buf[23] & 0xff; |
| 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_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 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->get_fabric_name()); |
| ret = TCM_INVALID_PARAMETER_LIST; |
| goto out; |
| } |
| initiator_str = target_parse_pr_out_transport_id(dest_se_tpg, |
| (const char *)&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->get_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->get_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->get_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->get_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->get_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, |
| atomic_read(&dest_se_deve->pr_kref.refcount) != 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_INVALID_PARAMETER_LIST; |
| 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->get_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->get_fabric_name(), pr_reg_nacl->initiatorname, |
| i_buf, dest_tf_ops->get_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); |
| |
| transport_kunmap_data_sg(cmd); |
| |
| 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; |
| } |
| |
| static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb) |
| { |
| unsigned int __v1, __v2; |
| |
| __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3]; |
| __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7]; |
| |
| return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; |
| } |
| |
| /* |
| * 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_INVALID_PARAMETER_LIST; |
| } |
| |
| /* |
| * 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 = core_scsi3_extract_reservation_key(&buf[0]); |
| sa_res_key = core_scsi3_extract_reservation_key(&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 && ((cdb[1] & 0x1f) != 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 && ((cdb[1] & 0x1f) != 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_INVALID_PARAMETER_LIST; |
| } |
| |
| /* |
| * (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", cdb[1] & 0x1f); |
| 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; |
| |
| buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); |
| buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); |
| buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); |
| buf[3] = (dev->t10_pr.pr_generation & 0xff); |
| |
| 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 ((add_len + 8) > (cmd->data_length - 8)) |
| break; |
| |
| buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); |
| buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); |
| buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); |
| buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); |
| buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); |
| buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); |
| buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); |
| buf[off++] = (pr_reg->pr_res_key & 0xff); |
| |
| add_len += 8; |
| } |
| spin_unlock(&dev->t10_pr.registration_lock); |
| |
| buf[4] = ((add_len >> 24) & 0xff); |
| buf[5] = ((add_len >> 16) & 0xff); |
| buf[6] = ((add_len >> 8) & 0xff); |
| buf[7] = (add_len & 0xff); |
| |
| 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 = 16; /* Hardcoded to 16 when a reservation is held. */ |
| |
| 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; |
| |
| buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); |
| buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); |
| buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); |
| buf[3] = (dev->t10_pr.pr_generation & 0xff); |
| |
| spin_lock(&dev->dev_reservation_lock); |
| pr_reg = dev->dev_pr_res_holder; |
| if (pr_reg) { |
| /* |
| * Set the hardcoded Additional Length |
| */ |
| buf[4] = ((add_len >> 24) & 0xff); |
| buf[5] = ((add_len >> 16) & 0xff); |
| buf[6] = ((add_len >> 8) & 0xff); |
| buf[7] = (add_len & 0xff); |
| |
| 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; |
| |
| buf[8] = ((pr_res_key >> 56) & 0xff); |
| buf[9] = ((pr_res_key >> 48) & 0xff); |
| buf[10] = ((pr_res_key >> 40) & 0xff); |
| buf[11] = ((pr_res_key >> 32) & 0xff); |
| buf[12] = ((pr_res_key >> 24) & 0xff); |
| buf[13] = ((pr_res_key >> 16) & 0xff); |
| buf[14] = ((pr_res_key >> 8) & 0xff); |
| buf[15] = (pr_res_key & 0xff); |
| /* |
| * Set the SCOPE and TYPE |
| */ |
| buf[21] = (pr_reg->pr_res_scope & 0xf0) | |
| (pr_reg->pr_res_type & 0x0f); |
| } |
| |
| 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 add_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; |
| |
| buf[0] = ((add_len >> 8) & 0xff); |
| buf[1] = (add_len & 0xff); |
| 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 */ |
| |
| 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; |
| |
| buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff); |
| buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff); |
| buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff); |
| buf[3] = (dev->t10_pr.pr_generation & 0xff); |
| |
| 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 |
| */ |
| buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff); |
| buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff); |
| buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff); |
| buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff); |
| buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff); |
| buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff); |
| buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff); |
| buf[off++] = (pr_reg->pr_res_key & 0xff); |
| 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; |
| |
| buf[off++] = ((sep_rtpi >> 8) & 0xff); |
| buf[off++] = (sep_rtpi & 0xff); |
| } 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 |
| */ |
| buf[off++] = ((desc_len >> 24) & 0xff); |
| buf[off++] = ((desc_len >> 16) & 0xff); |
| buf[off++] = ((desc_len >> 8) & 0xff); |
| buf[off++] = (desc_len & 0xff); |
| /* |
| * 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 |
| */ |
| buf[4] = ((add_len >> 24) & 0xff); |
| buf[5] = ((add_len >> 16) & 0xff); |
| buf[6] = ((add_len >> 8) & 0xff); |
| buf[7] = (add_len & 0xff); |
| |
| 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->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) |
| 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; |
| } |
