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