1 /*******************************************************************************
2 * Filename: target_core_pr.c
4 * This file contains SPC-3 compliant persistent reservations and
5 * legacy SPC-2 reservations with compatible reservation handling (CRH=1)
7 * (c) Copyright 2009-2013 Datera, Inc.
9 * Nicholas A. Bellinger <nab@kernel.org>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
25 ******************************************************************************/
27 #include <linux/slab.h>
28 #include <linux/spinlock.h>
29 #include <linux/list.h>
30 #include <linux/file.h>
31 #include <scsi/scsi.h>
32 #include <scsi/scsi_cmnd.h>
33 #include <asm/unaligned.h>
35 #include <target/target_core_base.h>
36 #include <target/target_core_backend.h>
37 #include <target/target_core_fabric.h>
38 #include <target/target_core_configfs.h>
40 #include "target_core_internal.h"
41 #include "target_core_pr.h"
42 #include "target_core_ua.h"
45 * Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)
47 struct pr_transport_id_holder {
49 struct t10_pr_registration *dest_pr_reg;
50 struct se_portal_group *dest_tpg;
51 struct se_node_acl *dest_node_acl;
52 struct se_dev_entry *dest_se_deve;
53 struct list_head dest_list;
56 void core_pr_dump_initiator_port(
57 struct t10_pr_registration *pr_reg,
61 if (!pr_reg->isid_present_at_reg)
64 snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid);
69 REGISTER_AND_IGNORE_EXISTING_KEY,
78 static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
79 struct t10_pr_registration *, int);
82 target_scsi2_reservation_check(struct se_cmd *cmd)
84 struct se_device *dev = cmd->se_dev;
85 struct se_session *sess = cmd->se_sess;
87 switch (cmd->t_task_cdb[0]) {
96 if (!dev->dev_reserved_node_acl || !sess)
99 if (dev->dev_reserved_node_acl != sess->se_node_acl)
100 return TCM_RESERVATION_CONFLICT;
102 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
103 if (dev->dev_res_bin_isid != sess->sess_bin_isid)
104 return TCM_RESERVATION_CONFLICT;
110 static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
111 struct se_node_acl *, struct se_session *);
112 static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
114 static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd)
116 struct se_session *se_sess = cmd->se_sess;
117 struct se_device *dev = cmd->se_dev;
118 struct t10_pr_registration *pr_reg;
119 struct t10_reservation *pr_tmpl = &dev->t10_pr;
122 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
126 * From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
129 * A RESERVE(6) or RESERVE(10) command shall complete with GOOD
130 * status, but no reservation shall be established and the
131 * persistent reservation shall not be changed, if the command
132 * is received from a) and b) below.
134 * A RELEASE(6) or RELEASE(10) command shall complete with GOOD
135 * status, but the persistent reservation shall not be released,
136 * if the command is received from a) and b)
138 * a) An I_T nexus that is a persistent reservation holder; or
139 * b) An I_T nexus that is registered if a registrants only or
140 * all registrants type persistent reservation is present.
142 * In all other cases, a RESERVE(6) command, RESERVE(10) command,
143 * RELEASE(6) command, or RELEASE(10) command shall be processed
144 * as defined in SPC-2.
146 if (pr_reg->pr_res_holder) {
147 core_scsi3_put_pr_reg(pr_reg);
150 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
151 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
152 (pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
153 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
154 core_scsi3_put_pr_reg(pr_reg);
157 core_scsi3_put_pr_reg(pr_reg);
161 * Following spc2r20 5.5.1 Reservations overview:
163 * If a logical unit has executed a PERSISTENT RESERVE OUT
164 * command with the REGISTER or the REGISTER AND IGNORE
165 * EXISTING KEY service action and is still registered by any
166 * initiator, all RESERVE commands and all RELEASE commands
167 * regardless of initiator shall conflict and shall terminate
168 * with a RESERVATION CONFLICT status.
170 spin_lock(&pr_tmpl->registration_lock);
171 conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
172 spin_unlock(&pr_tmpl->registration_lock);
176 pr_err("Received legacy SPC-2 RESERVE/RELEASE"
177 " while active SPC-3 registrations exist,"
178 " returning RESERVATION_CONFLICT\n");
186 target_scsi2_reservation_release(struct se_cmd *cmd)
188 struct se_device *dev = cmd->se_dev;
189 struct se_session *sess = cmd->se_sess;
190 struct se_portal_group *tpg;
193 if (!sess || !sess->se_tpg)
195 rc = target_check_scsi2_reservation_conflict(cmd);
199 return TCM_RESERVATION_CONFLICT;
201 spin_lock(&dev->dev_reservation_lock);
202 if (!dev->dev_reserved_node_acl || !sess)
205 if (dev->dev_reserved_node_acl != sess->se_node_acl)
208 if (dev->dev_res_bin_isid != sess->sess_bin_isid)
211 dev->dev_reserved_node_acl = NULL;
212 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS;
213 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
214 dev->dev_res_bin_isid = 0;
215 dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID;
218 pr_debug("SCSI-2 Released reservation for %s LUN: %u ->"
219 " MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
220 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
221 sess->se_node_acl->initiatorname);
224 spin_unlock(&dev->dev_reservation_lock);
226 target_complete_cmd(cmd, GOOD);
231 target_scsi2_reservation_reserve(struct se_cmd *cmd)
233 struct se_device *dev = cmd->se_dev;
234 struct se_session *sess = cmd->se_sess;
235 struct se_portal_group *tpg;
236 sense_reason_t ret = 0;
239 if ((cmd->t_task_cdb[1] & 0x01) &&
240 (cmd->t_task_cdb[1] & 0x02)) {
241 pr_err("LongIO and Obselete Bits set, returning"
242 " ILLEGAL_REQUEST\n");
243 return TCM_UNSUPPORTED_SCSI_OPCODE;
246 * This is currently the case for target_core_mod passthrough struct se_cmd
249 if (!sess || !sess->se_tpg)
251 rc = target_check_scsi2_reservation_conflict(cmd);
256 return TCM_RESERVATION_CONFLICT;
259 spin_lock(&dev->dev_reservation_lock);
260 if (dev->dev_reserved_node_acl &&
261 (dev->dev_reserved_node_acl != sess->se_node_acl)) {
262 pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
263 tpg->se_tpg_tfo->get_fabric_name());
264 pr_err("Original reserver LUN: %u %s\n",
265 cmd->se_lun->unpacked_lun,
266 dev->dev_reserved_node_acl->initiatorname);
267 pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u"
268 " from %s \n", cmd->se_lun->unpacked_lun,
269 cmd->se_deve->mapped_lun,
270 sess->se_node_acl->initiatorname);
271 ret = TCM_RESERVATION_CONFLICT;
275 dev->dev_reserved_node_acl = sess->se_node_acl;
276 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS;
277 if (sess->sess_bin_isid != 0) {
278 dev->dev_res_bin_isid = sess->sess_bin_isid;
279 dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID;
281 pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u"
282 " for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
283 cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
284 sess->se_node_acl->initiatorname);
287 spin_unlock(&dev->dev_reservation_lock);
290 target_complete_cmd(cmd, GOOD);
296 * Begin SPC-3/SPC-4 Persistent Reservations emulation support
298 * This function is called by those initiator ports who are *NOT*
299 * the active PR reservation holder when a reservation is present.
301 static int core_scsi3_pr_seq_non_holder(
305 unsigned char *cdb = cmd->t_task_cdb;
306 struct se_dev_entry *se_deve;
307 struct se_session *se_sess = cmd->se_sess;
308 int other_cdb = 0, ignore_reg;
309 int registered_nexus = 0, ret = 1; /* Conflict by default */
310 int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
311 int we = 0; /* Write Exclusive */
312 int legacy = 0; /* Act like a legacy device and return
313 * RESERVATION CONFLICT on some CDBs */
315 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
317 * Determine if the registration should be ignored due to
318 * non-matching ISIDs in target_scsi3_pr_reservation_check().
320 ignore_reg = (pr_reg_type & 0x80000000);
322 pr_reg_type &= ~0x80000000;
324 switch (pr_reg_type) {
325 case PR_TYPE_WRITE_EXCLUSIVE:
327 case PR_TYPE_EXCLUSIVE_ACCESS:
329 * Some commands are only allowed for the persistent reservation
332 if ((se_deve->def_pr_registered) && !(ignore_reg))
333 registered_nexus = 1;
335 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
337 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
339 * Some commands are only allowed for registered I_T Nexuses.
342 if ((se_deve->def_pr_registered) && !(ignore_reg))
343 registered_nexus = 1;
345 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
347 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
349 * Each registered I_T Nexus is a reservation holder.
352 if ((se_deve->def_pr_registered) && !(ignore_reg))
353 registered_nexus = 1;
359 * Referenced from spc4r17 table 45 for *NON* PR holder access
362 case SECURITY_PROTOCOL_IN:
363 if (registered_nexus)
371 case RECEIVE_DIAGNOSTIC:
376 if (registered_nexus) {
380 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
382 case PERSISTENT_RESERVE_OUT:
384 * This follows PERSISTENT_RESERVE_OUT service actions that
385 * are allowed in the presence of various reservations.
386 * See spc4r17, table 46
388 switch (cdb[1] & 0x1f) {
391 case PRO_PREEMPT_AND_ABORT:
392 ret = (registered_nexus) ? 0 : 1;
395 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
398 case PRO_REGISTER_AND_MOVE:
403 ret = (registered_nexus) ? 0 : 1;
406 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
407 " action: 0x%02x\n", cdb[1] & 0x1f);
413 /* Handled by CRH=1 in target_scsi2_reservation_release() */
418 /* Handled by CRH=1 in target_scsi2_reservation_reserve() */
421 case TEST_UNIT_READY:
422 ret = (legacy) ? 1 : 0; /* Conflict for legacy */
425 switch (cdb[1] & 0x1f) {
426 case MI_MANAGEMENT_PROTOCOL_IN:
427 if (registered_nexus) {
431 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
433 case MI_REPORT_SUPPORTED_OPERATION_CODES:
434 case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
439 if (registered_nexus) {
443 ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
445 case MI_REPORT_ALIASES:
446 case MI_REPORT_IDENTIFYING_INFORMATION:
447 case MI_REPORT_PRIORITY:
448 case MI_REPORT_TARGET_PGS:
449 case MI_REPORT_TIMESTAMP:
450 ret = 0; /* Allowed */
453 pr_err("Unknown MI Service Action: 0x%02x\n",
458 case ACCESS_CONTROL_IN:
459 case ACCESS_CONTROL_OUT:
462 case READ_MEDIA_SERIAL_NUMBER:
465 case PERSISTENT_RESERVE_IN:
466 ret = 0; /*/ Allowed CDBs */
473 * Case where the CDB is explicitly allowed in the above switch
476 if (!ret && !other_cdb) {
477 pr_debug("Allowing explicit CDB: 0x%02x for %s"
478 " reservation holder\n", cdb[0],
479 core_scsi3_pr_dump_type(pr_reg_type));
484 * Check if write exclusive initiator ports *NOT* holding the
485 * WRITE_EXCLUSIVE_* reservation.
487 if (we && !registered_nexus) {
488 if (cmd->data_direction == DMA_TO_DEVICE) {
490 * Conflict for write exclusive
492 pr_debug("%s Conflict for unregistered nexus"
493 " %s CDB: 0x%02x to %s reservation\n",
494 transport_dump_cmd_direction(cmd),
495 se_sess->se_node_acl->initiatorname, cdb[0],
496 core_scsi3_pr_dump_type(pr_reg_type));
500 * Allow non WRITE CDBs for all Write Exclusive
501 * PR TYPEs to pass for registered and
502 * non-registered_nexuxes NOT holding the reservation.
504 * We only make noise for the unregisterd nexuses,
505 * as we expect registered non-reservation holding
506 * nexuses to issue CDBs.
509 if (!registered_nexus) {
510 pr_debug("Allowing implicit CDB: 0x%02x"
511 " for %s reservation on unregistered"
513 core_scsi3_pr_dump_type(pr_reg_type));
518 } else if ((reg_only) || (all_reg)) {
519 if (registered_nexus) {
521 * For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
522 * allow commands from registered nexuses.
525 pr_debug("Allowing implicit CDB: 0x%02x for %s"
526 " reservation\n", cdb[0],
527 core_scsi3_pr_dump_type(pr_reg_type));
532 pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
533 " for %s reservation\n", transport_dump_cmd_direction(cmd),
534 (registered_nexus) ? "" : "un",
535 se_sess->se_node_acl->initiatorname, cdb[0],
536 core_scsi3_pr_dump_type(pr_reg_type));
538 return 1; /* Conflict by default */
541 static sense_reason_t
542 target_scsi3_pr_reservation_check(struct se_cmd *cmd)
544 struct se_device *dev = cmd->se_dev;
545 struct se_session *sess = cmd->se_sess;
548 if (!dev->dev_pr_res_holder)
551 pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
552 cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
553 if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl)
554 goto check_nonholder;
556 if (dev->dev_pr_res_holder->isid_present_at_reg) {
557 if (dev->dev_pr_res_holder->pr_reg_bin_isid !=
558 sess->sess_bin_isid) {
559 pr_reg_type |= 0x80000000;
560 goto check_nonholder;
567 if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type))
568 return TCM_RESERVATION_CONFLICT;
572 static u32 core_scsi3_pr_generation(struct se_device *dev)
577 * PRGeneration field shall contain the value of a 32-bit wrapping
578 * counter mainted by the device server.
580 * Note that this is done regardless of Active Persist across
581 * Target PowerLoss (APTPL)
583 * See spc4r17 section 6.3.12 READ_KEYS service action
585 spin_lock(&dev->dev_reservation_lock);
586 prg = dev->t10_pr.pr_generation++;
587 spin_unlock(&dev->dev_reservation_lock);
592 static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
593 struct se_device *dev,
594 struct se_node_acl *nacl,
595 struct se_dev_entry *deve,
601 struct t10_pr_registration *pr_reg;
603 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
605 pr_err("Unable to allocate struct t10_pr_registration\n");
609 INIT_LIST_HEAD(&pr_reg->pr_reg_list);
610 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
611 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
612 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
613 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
614 atomic_set(&pr_reg->pr_res_holders, 0);
615 pr_reg->pr_reg_nacl = nacl;
616 pr_reg->pr_reg_deve = deve;
617 pr_reg->pr_res_mapped_lun = deve->mapped_lun;
618 pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun;
619 pr_reg->pr_res_key = sa_res_key;
620 pr_reg->pr_reg_all_tg_pt = all_tg_pt;
621 pr_reg->pr_reg_aptpl = aptpl;
622 pr_reg->pr_reg_tg_pt_lun = deve->se_lun;
624 * If an ISID value for this SCSI Initiator Port exists,
625 * save it to the registration now.
628 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
629 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
630 pr_reg->isid_present_at_reg = 1;
636 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
637 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
640 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
643 static struct t10_pr_registration *__core_scsi3_alloc_registration(
644 struct se_device *dev,
645 struct se_node_acl *nacl,
646 struct se_dev_entry *deve,
652 struct se_dev_entry *deve_tmp;
653 struct se_node_acl *nacl_tmp;
654 struct se_port *port, *port_tmp;
655 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
656 struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
659 * Create a registration for the I_T Nexus upon which the
660 * PROUT REGISTER was received.
662 pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid,
663 sa_res_key, all_tg_pt, aptpl);
667 * Return pointer to pr_reg for ALL_TG_PT=0
672 * Create list of matching SCSI Initiator Port registrations
675 spin_lock(&dev->se_port_lock);
676 list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) {
677 atomic_inc_mb(&port->sep_tg_pt_ref_cnt);
678 spin_unlock(&dev->se_port_lock);
680 spin_lock_bh(&port->sep_alua_lock);
681 list_for_each_entry(deve_tmp, &port->sep_alua_list,
684 * This pointer will be NULL for demo mode MappedLUNs
685 * that have not been make explicit via a ConfigFS
686 * MappedLUN group for the SCSI Initiator Node ACL.
688 if (!deve_tmp->se_lun_acl)
691 nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl;
693 * Skip the matching struct se_node_acl that is allocated
696 if (nacl == nacl_tmp)
699 * Only perform PR registrations for target ports on
700 * the same fabric module as the REGISTER w/ ALL_TG_PT=1
703 if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
706 * Look for a matching Initiator Node ACL in ASCII format
708 if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
711 atomic_inc_mb(&deve_tmp->pr_ref_count);
712 spin_unlock_bh(&port->sep_alua_lock);
714 * Grab a configfs group dependency that is released
715 * for the exception path at label out: below, or upon
716 * completion of adding ALL_TG_PT=1 registrations in
717 * __core_scsi3_add_registration()
719 ret = core_scsi3_lunacl_depend_item(deve_tmp);
721 pr_err("core_scsi3_lunacl_depend"
723 atomic_dec_mb(&port->sep_tg_pt_ref_cnt);
724 atomic_dec_mb(&deve_tmp->pr_ref_count);
728 * Located a matching SCSI Initiator Port on a different
729 * port, allocate the pr_reg_atp and attach it to the
730 * pr_reg->pr_reg_atp_list that will be processed once
731 * the original *pr_reg is processed in
732 * __core_scsi3_add_registration()
734 pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
735 nacl_tmp, deve_tmp, NULL,
736 sa_res_key, all_tg_pt, aptpl);
738 atomic_dec_mb(&port->sep_tg_pt_ref_cnt);
739 atomic_dec_mb(&deve_tmp->pr_ref_count);
740 core_scsi3_lunacl_undepend_item(deve_tmp);
744 list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
745 &pr_reg->pr_reg_atp_list);
746 spin_lock_bh(&port->sep_alua_lock);
748 spin_unlock_bh(&port->sep_alua_lock);
750 spin_lock(&dev->se_port_lock);
751 atomic_dec_mb(&port->sep_tg_pt_ref_cnt);
753 spin_unlock(&dev->se_port_lock);
757 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
758 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
759 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
760 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
761 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
763 kmem_cache_free(t10_pr_reg_cache, pr_reg);
767 int core_scsi3_alloc_aptpl_registration(
768 struct t10_reservation *pr_tmpl,
770 unsigned char *i_port,
773 unsigned char *t_port,
780 struct t10_pr_registration *pr_reg;
782 if (!i_port || !t_port || !sa_res_key) {
783 pr_err("Illegal parameters for APTPL registration\n");
787 pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
789 pr_err("Unable to allocate struct t10_pr_registration\n");
793 INIT_LIST_HEAD(&pr_reg->pr_reg_list);
794 INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
795 INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
796 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
797 INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
798 atomic_set(&pr_reg->pr_res_holders, 0);
799 pr_reg->pr_reg_nacl = NULL;
800 pr_reg->pr_reg_deve = NULL;
801 pr_reg->pr_res_mapped_lun = mapped_lun;
802 pr_reg->pr_aptpl_target_lun = target_lun;
803 pr_reg->pr_res_key = sa_res_key;
804 pr_reg->pr_reg_all_tg_pt = all_tg_pt;
805 pr_reg->pr_reg_aptpl = 1;
806 pr_reg->pr_reg_tg_pt_lun = NULL;
807 pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
808 pr_reg->pr_res_type = type;
810 * If an ISID value had been saved in APTPL metadata for this
811 * SCSI Initiator Port, restore it now.
814 pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
815 snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
816 pr_reg->isid_present_at_reg = 1;
819 * Copy the i_port and t_port information from caller.
821 snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
822 snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
823 pr_reg->pr_reg_tpgt = tpgt;
825 * Set pr_res_holder from caller, the pr_reg who is the reservation
826 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
827 * the Initiator Node LUN ACL from the fabric module is created for
830 pr_reg->pr_res_holder = res_holder;
832 list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
833 pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
834 " metadata\n", (res_holder) ? "+reservation" : "");
838 static void core_scsi3_aptpl_reserve(
839 struct se_device *dev,
840 struct se_portal_group *tpg,
841 struct se_node_acl *node_acl,
842 struct t10_pr_registration *pr_reg)
844 char i_buf[PR_REG_ISID_ID_LEN];
846 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
847 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
849 spin_lock(&dev->dev_reservation_lock);
850 dev->dev_pr_res_holder = pr_reg;
851 spin_unlock(&dev->dev_reservation_lock);
853 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
854 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
855 tpg->se_tpg_tfo->get_fabric_name(),
856 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
857 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
858 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
859 tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
863 static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
864 struct t10_pr_registration *, enum register_type, int);
866 static int __core_scsi3_check_aptpl_registration(
867 struct se_device *dev,
868 struct se_portal_group *tpg,
871 struct se_node_acl *nacl,
872 struct se_dev_entry *deve)
874 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
875 struct t10_reservation *pr_tmpl = &dev->t10_pr;
876 unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
877 unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
880 memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
881 memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
883 * Copy Initiator Port information from struct se_node_acl
885 snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
886 snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
887 tpg->se_tpg_tfo->tpg_get_wwn(tpg));
888 tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
890 * Look for the matching registrations+reservation from those
891 * created from APTPL metadata. Note that multiple registrations
892 * may exist for fabrics that use ISIDs in their SCSI Initiator Port
895 spin_lock(&pr_tmpl->aptpl_reg_lock);
896 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
899 if (!strcmp(pr_reg->pr_iport, i_port) &&
900 (pr_reg->pr_res_mapped_lun == deve->mapped_lun) &&
901 !(strcmp(pr_reg->pr_tport, t_port)) &&
902 (pr_reg->pr_reg_tpgt == tpgt) &&
903 (pr_reg->pr_aptpl_target_lun == target_lun)) {
905 pr_reg->pr_reg_nacl = nacl;
906 pr_reg->pr_reg_deve = deve;
907 pr_reg->pr_reg_tg_pt_lun = lun;
909 list_del(&pr_reg->pr_reg_aptpl_list);
910 spin_unlock(&pr_tmpl->aptpl_reg_lock);
912 * At this point all of the pointers in *pr_reg will
913 * be setup, so go ahead and add the registration.
916 __core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
918 * If this registration is the reservation holder,
919 * make that happen now..
921 if (pr_reg->pr_res_holder)
922 core_scsi3_aptpl_reserve(dev, tpg,
925 * Reenable pr_aptpl_active to accept new metadata
926 * updates once the SCSI device is active again..
928 spin_lock(&pr_tmpl->aptpl_reg_lock);
929 pr_tmpl->pr_aptpl_active = 1;
932 spin_unlock(&pr_tmpl->aptpl_reg_lock);
937 int core_scsi3_check_aptpl_registration(
938 struct se_device *dev,
939 struct se_portal_group *tpg,
941 struct se_node_acl *nacl,
944 struct se_dev_entry *deve = nacl->device_list[mapped_lun];
946 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
949 return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
950 lun->unpacked_lun, nacl, deve);
953 static void __core_scsi3_dump_registration(
954 struct target_core_fabric_ops *tfo,
955 struct se_device *dev,
956 struct se_node_acl *nacl,
957 struct t10_pr_registration *pr_reg,
958 enum register_type register_type)
960 struct se_portal_group *se_tpg = nacl->se_tpg;
961 char i_buf[PR_REG_ISID_ID_LEN];
963 memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
964 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
966 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
967 " Node: %s%s\n", tfo->get_fabric_name(), (register_type == REGISTER_AND_MOVE) ?
968 "_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ?
969 "_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
971 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
972 tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
973 tfo->tpg_get_tag(se_tpg));
974 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
975 " Port(s)\n", tfo->get_fabric_name(),
976 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
977 dev->transport->name);
978 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
979 " 0x%08x APTPL: %d\n", tfo->get_fabric_name(),
980 pr_reg->pr_res_key, pr_reg->pr_res_generation,
981 pr_reg->pr_reg_aptpl);
985 * this function can be called with struct se_device->dev_reservation_lock
986 * when register_move = 1
988 static void __core_scsi3_add_registration(
989 struct se_device *dev,
990 struct se_node_acl *nacl,
991 struct t10_pr_registration *pr_reg,
992 enum register_type register_type,
995 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
996 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
997 struct t10_reservation *pr_tmpl = &dev->t10_pr;
1000 * Increment PRgeneration counter for struct se_device upon a successful
1001 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1003 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1004 * action, the struct se_device->dev_reservation_lock will already be held,
1005 * so we do not call core_scsi3_pr_generation() which grabs the lock
1008 pr_reg->pr_res_generation = (register_move) ?
1009 dev->t10_pr.pr_generation++ :
1010 core_scsi3_pr_generation(dev);
1012 spin_lock(&pr_tmpl->registration_lock);
1013 list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
1014 pr_reg->pr_reg_deve->def_pr_registered = 1;
1016 __core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
1017 spin_unlock(&pr_tmpl->registration_lock);
1019 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1021 if (!pr_reg->pr_reg_all_tg_pt || register_move)
1024 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1025 * allocated in __core_scsi3_alloc_registration()
1027 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1028 &pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
1029 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1031 pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
1033 spin_lock(&pr_tmpl->registration_lock);
1034 list_add_tail(&pr_reg_tmp->pr_reg_list,
1035 &pr_tmpl->registration_list);
1036 pr_reg_tmp->pr_reg_deve->def_pr_registered = 1;
1038 __core_scsi3_dump_registration(tfo, dev,
1039 pr_reg_tmp->pr_reg_nacl, pr_reg_tmp,
1041 spin_unlock(&pr_tmpl->registration_lock);
1043 * Drop configfs group dependency reference from
1044 * __core_scsi3_alloc_registration()
1046 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1050 static int core_scsi3_alloc_registration(
1051 struct se_device *dev,
1052 struct se_node_acl *nacl,
1053 struct se_dev_entry *deve,
1054 unsigned char *isid,
1058 enum register_type register_type,
1061 struct t10_pr_registration *pr_reg;
1063 pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid,
1064 sa_res_key, all_tg_pt, aptpl);
1068 __core_scsi3_add_registration(dev, nacl, pr_reg,
1069 register_type, register_move);
1073 static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
1074 struct se_device *dev,
1075 struct se_node_acl *nacl,
1076 unsigned char *isid)
1078 struct t10_reservation *pr_tmpl = &dev->t10_pr;
1079 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
1080 struct se_portal_group *tpg;
1082 spin_lock(&pr_tmpl->registration_lock);
1083 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1084 &pr_tmpl->registration_list, pr_reg_list) {
1086 * First look for a matching struct se_node_acl
1088 if (pr_reg->pr_reg_nacl != nacl)
1091 tpg = pr_reg->pr_reg_nacl->se_tpg;
1093 * If this registration does NOT contain a fabric provided
1094 * ISID, then we have found a match.
1096 if (!pr_reg->isid_present_at_reg) {
1098 * Determine if this SCSI device server requires that
1099 * SCSI Intiatior TransportID w/ ISIDs is enforced
1100 * for fabric modules (iSCSI) requiring them.
1102 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1103 if (dev->dev_attrib.enforce_pr_isids)
1106 atomic_inc_mb(&pr_reg->pr_res_holders);
1107 spin_unlock(&pr_tmpl->registration_lock);
1111 * If the *pr_reg contains a fabric defined ISID for multi-value
1112 * SCSI Initiator Port TransportIDs, then we expect a valid
1113 * matching ISID to be provided by the local SCSI Initiator Port.
1117 if (strcmp(isid, pr_reg->pr_reg_isid))
1120 atomic_inc_mb(&pr_reg->pr_res_holders);
1121 spin_unlock(&pr_tmpl->registration_lock);
1124 spin_unlock(&pr_tmpl->registration_lock);
1129 static struct t10_pr_registration *core_scsi3_locate_pr_reg(
1130 struct se_device *dev,
1131 struct se_node_acl *nacl,
1132 struct se_session *sess)
1134 struct se_portal_group *tpg = nacl->se_tpg;
1135 unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1137 if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
1138 memset(&buf[0], 0, PR_REG_ISID_LEN);
1139 tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
1144 return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
1147 static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
1149 atomic_dec_mb(&pr_reg->pr_res_holders);
1152 static int core_scsi3_check_implicit_release(
1153 struct se_device *dev,
1154 struct t10_pr_registration *pr_reg)
1156 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
1157 struct t10_pr_registration *pr_res_holder;
1160 spin_lock(&dev->dev_reservation_lock);
1161 pr_res_holder = dev->dev_pr_res_holder;
1162 if (!pr_res_holder) {
1163 spin_unlock(&dev->dev_reservation_lock);
1166 if (pr_res_holder == pr_reg) {
1168 * Perform an implicit RELEASE if the registration that
1169 * is being released is holding the reservation.
1171 * From spc4r17, section 5.7.11.1:
1173 * e) If the I_T nexus is the persistent reservation holder
1174 * and the persistent reservation is not an all registrants
1175 * type, then a PERSISTENT RESERVE OUT command with REGISTER
1176 * service action or REGISTER AND IGNORE EXISTING KEY
1177 * service action with the SERVICE ACTION RESERVATION KEY
1178 * field set to zero (see 5.7.11.3).
1180 __core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0);
1183 * For 'All Registrants' reservation types, all existing
1184 * registrations are still processed as reservation holders
1185 * in core_scsi3_pr_seq_non_holder() after the initial
1186 * reservation holder is implicitly released here.
1188 } else if (pr_reg->pr_reg_all_tg_pt &&
1189 (!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
1190 pr_reg->pr_reg_nacl->initiatorname)) &&
1191 (pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
1192 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
1193 " UNREGISTER while existing reservation with matching"
1194 " key 0x%016Lx is present from another SCSI Initiator"
1195 " Port\n", pr_reg->pr_res_key);
1198 spin_unlock(&dev->dev_reservation_lock);
1204 * Called with struct t10_reservation->registration_lock held.
1206 static void __core_scsi3_free_registration(
1207 struct se_device *dev,
1208 struct t10_pr_registration *pr_reg,
1209 struct list_head *preempt_and_abort_list,
1212 struct target_core_fabric_ops *tfo =
1213 pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
1214 struct t10_reservation *pr_tmpl = &dev->t10_pr;
1215 char i_buf[PR_REG_ISID_ID_LEN];
1217 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1218 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1220 pr_reg->pr_reg_deve->def_pr_registered = 0;
1221 pr_reg->pr_reg_deve->pr_res_key = 0;
1222 list_del(&pr_reg->pr_reg_list);
1224 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1225 * so call core_scsi3_put_pr_reg() to decrement our reference.
1228 core_scsi3_put_pr_reg(pr_reg);
1230 * Wait until all reference from any other I_T nexuses for this
1231 * *pr_reg have been released. Because list_del() is called above,
1232 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1233 * count back to zero, and we release *pr_reg.
1235 while (atomic_read(&pr_reg->pr_res_holders) != 0) {
1236 spin_unlock(&pr_tmpl->registration_lock);
1237 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
1238 tfo->get_fabric_name());
1240 spin_lock(&pr_tmpl->registration_lock);
1243 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
1244 " Node: %s%s\n", tfo->get_fabric_name(),
1245 pr_reg->pr_reg_nacl->initiatorname,
1247 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1248 " Port(s)\n", tfo->get_fabric_name(),
1249 (pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
1250 dev->transport->name);
1251 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1252 " 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
1253 pr_reg->pr_res_generation);
1255 if (!preempt_and_abort_list) {
1256 pr_reg->pr_reg_deve = NULL;
1257 pr_reg->pr_reg_nacl = NULL;
1258 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1262 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1263 * are released once the ABORT_TASK_SET has completed..
1265 list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
1268 void core_scsi3_free_pr_reg_from_nacl(
1269 struct se_device *dev,
1270 struct se_node_acl *nacl)
1272 struct t10_reservation *pr_tmpl = &dev->t10_pr;
1273 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1275 * If the passed se_node_acl matches the reservation holder,
1276 * release the reservation.
1278 spin_lock(&dev->dev_reservation_lock);
1279 pr_res_holder = dev->dev_pr_res_holder;
1280 if ((pr_res_holder != NULL) &&
1281 (pr_res_holder->pr_reg_nacl == nacl))
1282 __core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0);
1283 spin_unlock(&dev->dev_reservation_lock);
1285 * Release any registration associated with the struct se_node_acl.
1287 spin_lock(&pr_tmpl->registration_lock);
1288 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1289 &pr_tmpl->registration_list, pr_reg_list) {
1291 if (pr_reg->pr_reg_nacl != nacl)
1294 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1296 spin_unlock(&pr_tmpl->registration_lock);
1299 void core_scsi3_free_all_registrations(
1300 struct se_device *dev)
1302 struct t10_reservation *pr_tmpl = &dev->t10_pr;
1303 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
1305 spin_lock(&dev->dev_reservation_lock);
1306 pr_res_holder = dev->dev_pr_res_holder;
1307 if (pr_res_holder != NULL) {
1308 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
1309 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
1312 spin_unlock(&dev->dev_reservation_lock);
1314 spin_lock(&pr_tmpl->registration_lock);
1315 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
1316 &pr_tmpl->registration_list, pr_reg_list) {
1318 __core_scsi3_free_registration(dev, pr_reg, NULL, 0);
1320 spin_unlock(&pr_tmpl->registration_lock);
1322 spin_lock(&pr_tmpl->aptpl_reg_lock);
1323 list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
1324 pr_reg_aptpl_list) {
1325 list_del(&pr_reg->pr_reg_aptpl_list);
1326 kmem_cache_free(t10_pr_reg_cache, pr_reg);
1328 spin_unlock(&pr_tmpl->aptpl_reg_lock);
1331 static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
1333 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1334 &tpg->tpg_group.cg_item);
1337 static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
1339 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1340 &tpg->tpg_group.cg_item);
1342 atomic_dec_mb(&tpg->tpg_pr_ref_count);
1345 static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
1347 struct se_portal_group *tpg = nacl->se_tpg;
1349 if (nacl->dynamic_node_acl)
1352 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1353 &nacl->acl_group.cg_item);
1356 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
1358 struct se_portal_group *tpg = nacl->se_tpg;
1360 if (nacl->dynamic_node_acl) {
1361 atomic_dec_mb(&nacl->acl_pr_ref_count);
1365 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1366 &nacl->acl_group.cg_item);
1368 atomic_dec_mb(&nacl->acl_pr_ref_count);
1371 static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
1373 struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1374 struct se_node_acl *nacl;
1375 struct se_portal_group *tpg;
1377 * For nacl->dynamic_node_acl=1
1382 nacl = lun_acl->se_lun_nacl;
1385 return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
1386 &lun_acl->se_lun_group.cg_item);
1389 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
1391 struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
1392 struct se_node_acl *nacl;
1393 struct se_portal_group *tpg;
1395 * For nacl->dynamic_node_acl=1
1398 atomic_dec_mb(&se_deve->pr_ref_count);
1401 nacl = lun_acl->se_lun_nacl;
1404 configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
1405 &lun_acl->se_lun_group.cg_item);
1407 atomic_dec_mb(&se_deve->pr_ref_count);
1410 static sense_reason_t
1411 core_scsi3_decode_spec_i_port(
1413 struct se_portal_group *tpg,
1414 unsigned char *l_isid,
1419 struct se_device *dev = cmd->se_dev;
1420 struct se_port *tmp_port;
1421 struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
1422 struct se_session *se_sess = cmd->se_sess;
1423 struct se_node_acl *dest_node_acl = NULL;
1424 struct se_dev_entry *dest_se_deve = NULL, *local_se_deve;
1425 struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
1426 struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
1427 LIST_HEAD(tid_dest_list);
1428 struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
1429 struct target_core_fabric_ops *tmp_tf_ops;
1431 unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident;
1432 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
1434 u32 tpdl, tid_len = 0;
1435 int dest_local_nexus;
1438 memset(dest_iport, 0, 64);
1440 local_se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
1442 * Allocate a struct pr_transport_id_holder and setup the
1443 * local_node_acl and local_se_deve pointers and add to
1444 * struct list_head tid_dest_list for add registration
1445 * processing in the loop of tid_dest_list below.
1447 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
1449 pr_err("Unable to allocate tidh_new\n");
1450 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1452 INIT_LIST_HEAD(&tidh_new->dest_list);
1453 tidh_new->dest_tpg = tpg;
1454 tidh_new->dest_node_acl = se_sess->se_node_acl;
1455 tidh_new->dest_se_deve = local_se_deve;
1457 local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1458 se_sess->se_node_acl, local_se_deve, l_isid,
1459 sa_res_key, all_tg_pt, aptpl);
1460 if (!local_pr_reg) {
1462 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1464 tidh_new->dest_pr_reg = local_pr_reg;
1466 * The local I_T nexus does not hold any configfs dependances,
1467 * so we set tid_h->dest_local_nexus=1 to prevent the
1468 * configfs_undepend_item() calls in the tid_dest_list loops below.
1470 tidh_new->dest_local_nexus = 1;
1471 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1473 if (cmd->data_length < 28) {
1474 pr_warn("SPC-PR: Received PR OUT parameter list"
1475 " length too small: %u\n", cmd->data_length);
1476 ret = TCM_INVALID_PARAMETER_LIST;
1480 buf = transport_kmap_data_sg(cmd);
1482 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1487 * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1488 * first extract TransportID Parameter Data Length, and make sure
1489 * the value matches up to the SCSI expected data transfer length.
1491 tpdl = (buf[24] & 0xff) << 24;
1492 tpdl |= (buf[25] & 0xff) << 16;
1493 tpdl |= (buf[26] & 0xff) << 8;
1494 tpdl |= buf[27] & 0xff;
1496 if ((tpdl + 28) != cmd->data_length) {
1497 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
1498 " does not equal CDB data_length: %u\n", tpdl,
1500 ret = TCM_INVALID_PARAMETER_LIST;
1504 * Start processing the received transport IDs using the
1505 * receiving I_T Nexus portal's fabric dependent methods to
1506 * obtain the SCSI Initiator Port/Device Identifiers.
1511 proto_ident = (ptr[0] & 0x0f);
1514 spin_lock(&dev->se_port_lock);
1515 list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) {
1516 tmp_tpg = tmp_port->sep_tpg;
1519 tmp_tf_ops = tmp_tpg->se_tpg_tfo;
1522 if (!tmp_tf_ops->get_fabric_proto_ident ||
1523 !tmp_tf_ops->tpg_parse_pr_out_transport_id)
1526 * Look for the matching proto_ident provided by
1527 * the received TransportID
1529 tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg);
1530 if (tmp_proto_ident != proto_ident)
1532 dest_rtpi = tmp_port->sep_rtpi;
1534 i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id(
1535 tmp_tpg, (const char *)ptr, &tid_len,
1540 atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count);
1541 spin_unlock(&dev->se_port_lock);
1543 if (core_scsi3_tpg_depend_item(tmp_tpg)) {
1544 pr_err(" core_scsi3_tpg_depend_item()"
1546 atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count);
1547 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1551 * Locate the destination initiator ACL to be registered
1552 * from the decoded fabric module specific TransportID
1555 spin_lock_irq(&tmp_tpg->acl_node_lock);
1556 dest_node_acl = __core_tpg_get_initiator_node_acl(
1559 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
1560 spin_unlock_irq(&tmp_tpg->acl_node_lock);
1562 if (!dest_node_acl) {
1563 core_scsi3_tpg_undepend_item(tmp_tpg);
1564 spin_lock(&dev->se_port_lock);
1568 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
1569 pr_err("configfs_depend_item() failed"
1570 " for dest_node_acl->acl_group\n");
1571 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
1572 core_scsi3_tpg_undepend_item(tmp_tpg);
1573 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1578 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
1579 " %s Port RTPI: %hu\n",
1580 dest_tpg->se_tpg_tfo->get_fabric_name(),
1581 dest_node_acl->initiatorname, dest_rtpi);
1583 spin_lock(&dev->se_port_lock);
1586 spin_unlock(&dev->se_port_lock);
1589 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
1591 ret = TCM_INVALID_PARAMETER_LIST;
1595 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
1596 " tid_len: %d for %s + %s\n",
1597 dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
1598 tpdl, tid_len, i_str, iport_ptr);
1600 if (tid_len > tpdl) {
1601 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
1602 " %u for Transport ID: %s\n", tid_len, ptr);
1603 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1604 core_scsi3_tpg_undepend_item(dest_tpg);
1605 ret = TCM_INVALID_PARAMETER_LIST;
1609 * Locate the desintation struct se_dev_entry pointer for matching
1610 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1613 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
1615 if (!dest_se_deve) {
1616 pr_err("Unable to locate %s dest_se_deve"
1617 " from destination RTPI: %hu\n",
1618 dest_tpg->se_tpg_tfo->get_fabric_name(),
1621 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1622 core_scsi3_tpg_undepend_item(dest_tpg);
1623 ret = TCM_INVALID_PARAMETER_LIST;
1627 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
1628 pr_err("core_scsi3_lunacl_depend_item()"
1630 atomic_dec_mb(&dest_se_deve->pr_ref_count);
1631 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1632 core_scsi3_tpg_undepend_item(dest_tpg);
1633 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1637 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
1638 " dest_se_deve mapped_lun: %u\n",
1639 dest_tpg->se_tpg_tfo->get_fabric_name(),
1640 dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
1643 * Skip any TransportIDs that already have a registration for
1646 pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
1649 core_scsi3_put_pr_reg(pr_reg_e);
1650 core_scsi3_lunacl_undepend_item(dest_se_deve);
1651 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1652 core_scsi3_tpg_undepend_item(dest_tpg);
1659 * Allocate a struct pr_transport_id_holder and setup
1660 * the dest_node_acl and dest_se_deve pointers for the
1663 tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
1666 pr_err("Unable to allocate tidh_new\n");
1667 core_scsi3_lunacl_undepend_item(dest_se_deve);
1668 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1669 core_scsi3_tpg_undepend_item(dest_tpg);
1670 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1673 INIT_LIST_HEAD(&tidh_new->dest_list);
1674 tidh_new->dest_tpg = dest_tpg;
1675 tidh_new->dest_node_acl = dest_node_acl;
1676 tidh_new->dest_se_deve = dest_se_deve;
1679 * Allocate, but do NOT add the registration for the
1680 * TransportID referenced SCSI Initiator port. This
1681 * done because of the following from spc4r17 in section
1682 * 6.14.3 wrt SPEC_I_PT:
1684 * "If a registration fails for any initiator port (e.g., if th
1685 * logical unit does not have enough resources available to
1686 * hold the registration information), no registrations shall be
1687 * made, and the command shall be terminated with
1688 * CHECK CONDITION status."
1690 * That means we call __core_scsi3_alloc_registration() here,
1691 * and then call __core_scsi3_add_registration() in the
1692 * 2nd loop which will never fail.
1694 dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
1695 dest_node_acl, dest_se_deve, iport_ptr,
1696 sa_res_key, all_tg_pt, aptpl);
1698 core_scsi3_lunacl_undepend_item(dest_se_deve);
1699 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1700 core_scsi3_tpg_undepend_item(dest_tpg);
1702 ret = TCM_INVALID_PARAMETER_LIST;
1705 tidh_new->dest_pr_reg = dest_pr_reg;
1706 list_add_tail(&tidh_new->dest_list, &tid_dest_list);
1714 transport_kunmap_data_sg(cmd);
1717 * Go ahead and create a registrations from tid_dest_list for the
1718 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1721 * The SA Reservation Key from the PROUT is set for the
1722 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1
1723 * means that the TransportID Initiator port will be
1724 * registered on all of the target ports in the SCSI target device
1725 * ALL_TG_PT=0 means the registration will only be for the
1726 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1729 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1730 dest_tpg = tidh->dest_tpg;
1731 dest_node_acl = tidh->dest_node_acl;
1732 dest_se_deve = tidh->dest_se_deve;
1733 dest_pr_reg = tidh->dest_pr_reg;
1734 dest_local_nexus = tidh->dest_local_nexus;
1736 list_del(&tidh->dest_list);
1739 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
1740 core_pr_dump_initiator_port(dest_pr_reg, i_buf, PR_REG_ISID_ID_LEN);
1742 __core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
1745 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
1746 " registered Transport ID for Node: %s%s Mapped LUN:"
1747 " %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
1748 dest_node_acl->initiatorname, i_buf, dest_se_deve->mapped_lun);
1750 if (dest_local_nexus)
1753 core_scsi3_lunacl_undepend_item(dest_se_deve);
1754 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1755 core_scsi3_tpg_undepend_item(dest_tpg);
1760 transport_kunmap_data_sg(cmd);
1763 * For the failure case, release everything from tid_dest_list
1764 * including *dest_pr_reg and the configfs dependances..
1766 list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
1767 dest_tpg = tidh->dest_tpg;
1768 dest_node_acl = tidh->dest_node_acl;
1769 dest_se_deve = tidh->dest_se_deve;
1770 dest_pr_reg = tidh->dest_pr_reg;
1771 dest_local_nexus = tidh->dest_local_nexus;
1773 list_del(&tidh->dest_list);
1776 * Release any extra ALL_TG_PT=1 registrations for
1777 * the SPEC_I_PT=1 case.
1779 list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
1780 &dest_pr_reg->pr_reg_atp_list,
1781 pr_reg_atp_mem_list) {
1782 list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
1783 core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
1784 kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
1787 kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
1789 if (dest_local_nexus)
1792 core_scsi3_lunacl_undepend_item(dest_se_deve);
1793 core_scsi3_nodeacl_undepend_item(dest_node_acl);
1794 core_scsi3_tpg_undepend_item(dest_tpg);
1799 static int core_scsi3_update_aptpl_buf(
1800 struct se_device *dev,
1802 u32 pr_aptpl_buf_len)
1805 struct se_portal_group *tpg;
1806 struct t10_pr_registration *pr_reg;
1807 unsigned char tmp[512], isid_buf[32];
1812 spin_lock(&dev->dev_reservation_lock);
1813 spin_lock(&dev->t10_pr.registration_lock);
1815 * Walk the registration list..
1817 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
1822 tpg = pr_reg->pr_reg_nacl->se_tpg;
1823 lun = pr_reg->pr_reg_tg_pt_lun;
1825 * Write out any ISID value to APTPL metadata that was included
1826 * in the original registration.
1828 if (pr_reg->isid_present_at_reg)
1829 snprintf(isid_buf, 32, "initiator_sid=%s\n",
1830 pr_reg->pr_reg_isid);
1832 * Include special metadata if the pr_reg matches the
1833 * reservation holder.
1835 if (dev->dev_pr_res_holder == pr_reg) {
1836 snprintf(tmp, 512, "PR_REG_START: %d"
1837 "\ninitiator_fabric=%s\n"
1838 "initiator_node=%s\n%s"
1840 "res_holder=1\nres_type=%02x\n"
1841 "res_scope=%02x\nres_all_tg_pt=%d\n"
1842 "mapped_lun=%u\n", reg_count,
1843 tpg->se_tpg_tfo->get_fabric_name(),
1844 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1845 pr_reg->pr_res_key, pr_reg->pr_res_type,
1846 pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
1847 pr_reg->pr_res_mapped_lun);
1849 snprintf(tmp, 512, "PR_REG_START: %d\n"
1850 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1851 "sa_res_key=%llu\nres_holder=0\n"
1852 "res_all_tg_pt=%d\nmapped_lun=%u\n",
1853 reg_count, tpg->se_tpg_tfo->get_fabric_name(),
1854 pr_reg->pr_reg_nacl->initiatorname, isid_buf,
1855 pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
1856 pr_reg->pr_res_mapped_lun);
1859 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1860 pr_err("Unable to update renaming"
1861 " APTPL metadata\n");
1865 len += sprintf(buf+len, "%s", tmp);
1868 * Include information about the associated SCSI target port.
1870 snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
1871 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
1872 " %d\n", tpg->se_tpg_tfo->get_fabric_name(),
1873 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1874 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1875 lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count);
1877 if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
1878 pr_err("Unable to update renaming"
1879 " APTPL metadata\n");
1883 len += sprintf(buf+len, "%s", tmp);
1888 len += sprintf(buf+len, "No Registrations or Reservations");
1891 spin_unlock(&dev->t10_pr.registration_lock);
1892 spin_unlock(&dev->dev_reservation_lock);
1897 static int __core_scsi3_write_aptpl_to_file(
1898 struct se_device *dev,
1901 struct t10_wwn *wwn = &dev->t10_wwn;
1903 int flags = O_RDWR | O_CREAT | O_TRUNC;
1905 u32 pr_aptpl_buf_len;
1908 memset(path, 0, 512);
1910 if (strlen(&wwn->unit_serial[0]) >= 512) {
1911 pr_err("WWN value for struct se_device does not fit"
1912 " into path buffer\n");
1916 snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
1917 file = filp_open(path, flags, 0600);
1919 pr_err("filp_open(%s) for APTPL metadata"
1921 return PTR_ERR(file);
1924 pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */
1926 ret = kernel_write(file, buf, pr_aptpl_buf_len, 0);
1929 pr_debug("Error writing APTPL metadata file: %s\n", path);
1932 return (ret < 0) ? -EIO : 0;
1936 * Clear the APTPL metadata if APTPL has been disabled, otherwise
1937 * write out the updated metadata to struct file for this SCSI device.
1939 static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl)
1945 char *null_buf = "No Registrations or Reservations\n";
1947 rc = __core_scsi3_write_aptpl_to_file(dev, null_buf);
1948 dev->t10_pr.pr_aptpl_active = 0;
1949 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n");
1952 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1957 buf = kzalloc(PR_APTPL_BUF_LEN, GFP_KERNEL);
1959 return TCM_OUT_OF_RESOURCES;
1961 rc = core_scsi3_update_aptpl_buf(dev, buf, PR_APTPL_BUF_LEN);
1964 return TCM_OUT_OF_RESOURCES;
1967 rc = __core_scsi3_write_aptpl_to_file(dev, buf);
1969 pr_err("SPC-3 PR: Could not update APTPL\n");
1971 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1973 dev->t10_pr.pr_aptpl_active = 1;
1975 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n");
1979 static sense_reason_t
1980 core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,
1981 bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type)
1983 struct se_session *se_sess = cmd->se_sess;
1984 struct se_device *dev = cmd->se_dev;
1985 struct se_dev_entry *se_deve;
1986 struct se_lun *se_lun = cmd->se_lun;
1987 struct se_portal_group *se_tpg;
1988 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp;
1989 struct t10_reservation *pr_tmpl = &dev->t10_pr;
1990 unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
1991 sense_reason_t ret = TCM_NO_SENSE;
1992 int pr_holder = 0, type;
1994 if (!se_sess || !se_lun) {
1995 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
1996 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1998 se_tpg = se_sess->se_tpg;
1999 se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
2001 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
2002 memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
2003 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
2005 isid_ptr = &isid_buf[0];
2008 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2010 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2013 pr_warn("SPC-3 PR: Reservation Key non-zero"
2014 " for SA REGISTER, returning CONFLICT\n");
2015 return TCM_RESERVATION_CONFLICT;
2018 * Do nothing but return GOOD status.
2025 * Perform the Service Action REGISTER on the Initiator
2026 * Port Endpoint that the PRO was received from on the
2027 * Logical Unit of the SCSI device server.
2029 if (core_scsi3_alloc_registration(cmd->se_dev,
2030 se_sess->se_node_acl, se_deve, isid_ptr,
2031 sa_res_key, all_tg_pt, aptpl,
2032 register_type, 0)) {
2033 pr_err("Unable to allocate"
2034 " struct t10_pr_registration\n");
2035 return TCM_INVALID_PARAMETER_LIST;
2039 * Register both the Initiator port that received
2040 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2041 * TransportID from Parameter list and loop through
2042 * fabric dependent parameter list while calling
2043 * logic from of core_scsi3_alloc_registration() for
2044 * each TransportID provided SCSI Initiator Port/Device
2046 ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
2047 isid_ptr, sa_res_key, all_tg_pt, aptpl);
2052 return core_scsi3_update_and_write_aptpl(dev, aptpl);
2055 /* ok, existing registration */
2057 if ((register_type == REGISTER) && (res_key != pr_reg->pr_res_key)) {
2058 pr_err("SPC-3 PR REGISTER: Received"
2059 " res_key: 0x%016Lx does not match"
2060 " existing SA REGISTER res_key:"
2061 " 0x%016Lx\n", res_key,
2062 pr_reg->pr_res_key);
2063 ret = TCM_RESERVATION_CONFLICT;
2068 pr_err("SPC-3 PR REGISTER: SPEC_I_PT"
2069 " set on a registered nexus\n");
2070 ret = TCM_INVALID_PARAMETER_LIST;
2075 * An existing ALL_TG_PT=1 registration being released
2076 * must also set ALL_TG_PT=1 in the incoming PROUT.
2078 if (pr_reg->pr_reg_all_tg_pt && !all_tg_pt) {
2079 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1"
2080 " registration exists, but ALL_TG_PT=1 bit not"
2081 " present in received PROUT\n");
2082 ret = TCM_INVALID_CDB_FIELD;
2087 * sa_res_key=1 Change Reservation Key for registered I_T Nexus.
2091 * Increment PRgeneration counter for struct se_device"
2092 * upon a successful REGISTER, see spc4r17 section 6.3.2
2093 * READ_KEYS service action.
2095 pr_reg->pr_res_generation = core_scsi3_pr_generation(cmd->se_dev);
2096 pr_reg->pr_res_key = sa_res_key;
2097 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2098 " Key for %s to: 0x%016Lx PRgeneration:"
2099 " 0x%08x\n", cmd->se_tfo->get_fabric_name(),
2100 (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "",
2101 pr_reg->pr_reg_nacl->initiatorname,
2102 pr_reg->pr_res_key, pr_reg->pr_res_generation);
2106 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus.
2108 pr_holder = core_scsi3_check_implicit_release(
2109 cmd->se_dev, pr_reg);
2110 if (pr_holder < 0) {
2111 ret = TCM_RESERVATION_CONFLICT;
2114 type = pr_reg->pr_res_type;
2116 spin_lock(&pr_tmpl->registration_lock);
2118 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2119 * and matching pr_res_key.
2121 if (pr_reg->pr_reg_all_tg_pt) {
2122 list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
2123 &pr_tmpl->registration_list,
2126 if (!pr_reg_p->pr_reg_all_tg_pt)
2128 if (pr_reg_p->pr_res_key != res_key)
2130 if (pr_reg == pr_reg_p)
2132 if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
2133 pr_reg_p->pr_reg_nacl->initiatorname))
2136 __core_scsi3_free_registration(dev,
2142 * Release the calling I_T Nexus registration now..
2144 __core_scsi3_free_registration(cmd->se_dev, pr_reg, NULL, 1);
2148 * From spc4r17, section 5.7.11.3 Unregistering
2150 * If the persistent reservation is a registrants only
2151 * type, the device server shall establish a unit
2152 * attention condition for the initiator port associated
2153 * with every registered I_T nexus except for the I_T
2154 * nexus on which the PERSISTENT RESERVE OUT command was
2155 * received, with the additional sense code set to
2156 * RESERVATIONS RELEASED.
2159 (type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY ||
2160 type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY)) {
2161 list_for_each_entry(pr_reg_p,
2162 &pr_tmpl->registration_list,
2165 core_scsi3_ua_allocate(
2166 pr_reg_p->pr_reg_nacl,
2167 pr_reg_p->pr_res_mapped_lun,
2169 ASCQ_2AH_RESERVATIONS_RELEASED);
2173 spin_unlock(&pr_tmpl->registration_lock);
2176 ret = core_scsi3_update_and_write_aptpl(dev, aptpl);
2180 core_scsi3_put_pr_reg(pr_reg);
2184 unsigned char *core_scsi3_pr_dump_type(int type)
2187 case PR_TYPE_WRITE_EXCLUSIVE:
2188 return "Write Exclusive Access";
2189 case PR_TYPE_EXCLUSIVE_ACCESS:
2190 return "Exclusive Access";
2191 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2192 return "Write Exclusive Access, Registrants Only";
2193 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2194 return "Exclusive Access, Registrants Only";
2195 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2196 return "Write Exclusive Access, All Registrants";
2197 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2198 return "Exclusive Access, All Registrants";
2203 return "Unknown SPC-3 PR Type";
2206 static sense_reason_t
2207 core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key)
2209 struct se_device *dev = cmd->se_dev;
2210 struct se_session *se_sess = cmd->se_sess;
2211 struct se_lun *se_lun = cmd->se_lun;
2212 struct t10_pr_registration *pr_reg, *pr_res_holder;
2213 struct t10_reservation *pr_tmpl = &dev->t10_pr;
2214 char i_buf[PR_REG_ISID_ID_LEN];
2217 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2219 if (!se_sess || !se_lun) {
2220 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2221 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2224 * Locate the existing *pr_reg via struct se_node_acl pointers
2226 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2229 pr_err("SPC-3 PR: Unable to locate"
2230 " PR_REGISTERED *pr_reg for RESERVE\n");
2231 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2234 * From spc4r17 Section 5.7.9: Reserving:
2236 * An application client creates a persistent reservation by issuing
2237 * a PERSISTENT RESERVE OUT command with RESERVE service action through
2238 * a registered I_T nexus with the following parameters:
2239 * a) RESERVATION KEY set to the value of the reservation key that is
2240 * registered with the logical unit for the I_T nexus; and
2242 if (res_key != pr_reg->pr_res_key) {
2243 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
2244 " does not match existing SA REGISTER res_key:"
2245 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2246 ret = TCM_RESERVATION_CONFLICT;
2247 goto out_put_pr_reg;
2250 * From spc4r17 Section 5.7.9: Reserving:
2253 * b) TYPE field and SCOPE field set to the persistent reservation
2256 * Only one persistent reservation is allowed at a time per logical unit
2257 * and that persistent reservation has a scope of LU_SCOPE.
2259 if (scope != PR_SCOPE_LU_SCOPE) {
2260 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2261 ret = TCM_INVALID_PARAMETER_LIST;
2262 goto out_put_pr_reg;
2265 * See if we have an existing PR reservation holder pointer at
2266 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2269 spin_lock(&dev->dev_reservation_lock);
2270 pr_res_holder = dev->dev_pr_res_holder;
2271 if (pr_res_holder) {
2273 * From spc4r17 Section 5.7.9: Reserving:
2275 * If the device server receives a PERSISTENT RESERVE OUT
2276 * command from an I_T nexus other than a persistent reservation
2277 * holder (see 5.7.10) that attempts to create a persistent
2278 * reservation when a persistent reservation already exists for
2279 * the logical unit, then the command shall be completed with
2280 * RESERVATION CONFLICT status.
2282 if (pr_res_holder != pr_reg) {
2283 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2284 pr_err("SPC-3 PR: Attempted RESERVE from"
2285 " [%s]: %s while reservation already held by"
2286 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2287 cmd->se_tfo->get_fabric_name(),
2288 se_sess->se_node_acl->initiatorname,
2289 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2290 pr_res_holder->pr_reg_nacl->initiatorname);
2292 spin_unlock(&dev->dev_reservation_lock);
2293 ret = TCM_RESERVATION_CONFLICT;
2294 goto out_put_pr_reg;
2297 * From spc4r17 Section 5.7.9: Reserving:
2299 * If a persistent reservation holder attempts to modify the
2300 * type or scope of an existing persistent reservation, the
2301 * command shall be completed with RESERVATION CONFLICT status.
2303 if ((pr_res_holder->pr_res_type != type) ||
2304 (pr_res_holder->pr_res_scope != scope)) {
2305 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2306 pr_err("SPC-3 PR: Attempted RESERVE from"
2307 " [%s]: %s trying to change TYPE and/or SCOPE,"
2308 " while reservation already held by [%s]: %s,"
2309 " returning RESERVATION_CONFLICT\n",
2310 cmd->se_tfo->get_fabric_name(),
2311 se_sess->se_node_acl->initiatorname,
2312 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2313 pr_res_holder->pr_reg_nacl->initiatorname);
2315 spin_unlock(&dev->dev_reservation_lock);
2316 ret = TCM_RESERVATION_CONFLICT;
2317 goto out_put_pr_reg;
2320 * From spc4r17 Section 5.7.9: Reserving:
2322 * If the device server receives a PERSISTENT RESERVE OUT
2323 * command with RESERVE service action where the TYPE field and
2324 * the SCOPE field contain the same values as the existing type
2325 * and scope from a persistent reservation holder, it shall not
2326 * make any change to the existing persistent reservation and
2327 * shall completethe command with GOOD status.
2329 spin_unlock(&dev->dev_reservation_lock);
2331 goto out_put_pr_reg;
2334 * Otherwise, our *pr_reg becomes the PR reservation holder for said
2335 * TYPE/SCOPE. Also set the received scope and type in *pr_reg.
2337 pr_reg->pr_res_scope = scope;
2338 pr_reg->pr_res_type = type;
2339 pr_reg->pr_res_holder = 1;
2340 dev->dev_pr_res_holder = pr_reg;
2341 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2343 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
2344 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2345 cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
2346 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2347 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
2348 cmd->se_tfo->get_fabric_name(),
2349 se_sess->se_node_acl->initiatorname,
2351 spin_unlock(&dev->dev_reservation_lock);
2353 if (pr_tmpl->pr_aptpl_active)
2354 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2358 core_scsi3_put_pr_reg(pr_reg);
2362 static sense_reason_t
2363 core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope,
2367 case PR_TYPE_WRITE_EXCLUSIVE:
2368 case PR_TYPE_EXCLUSIVE_ACCESS:
2369 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
2370 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
2371 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
2372 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
2373 return core_scsi3_pro_reserve(cmd, type, scope, res_key);
2375 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
2377 return TCM_INVALID_CDB_FIELD;
2382 * Called with struct se_device->dev_reservation_lock held.
2384 static void __core_scsi3_complete_pro_release(
2385 struct se_device *dev,
2386 struct se_node_acl *se_nacl,
2387 struct t10_pr_registration *pr_reg,
2390 struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
2391 char i_buf[PR_REG_ISID_ID_LEN];
2393 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2394 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2396 * Go ahead and release the current PR reservation holder.
2398 dev->dev_pr_res_holder = NULL;
2400 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2401 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2402 tfo->get_fabric_name(), (explicit) ? "explicit" : "implicit",
2403 core_scsi3_pr_dump_type(pr_reg->pr_res_type),
2404 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2405 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
2406 tfo->get_fabric_name(), se_nacl->initiatorname,
2409 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2411 pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
2414 static sense_reason_t
2415 core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope,
2418 struct se_device *dev = cmd->se_dev;
2419 struct se_session *se_sess = cmd->se_sess;
2420 struct se_lun *se_lun = cmd->se_lun;
2421 struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
2422 struct t10_reservation *pr_tmpl = &dev->t10_pr;
2424 sense_reason_t ret = 0;
2426 if (!se_sess || !se_lun) {
2427 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2428 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2431 * Locate the existing *pr_reg via struct se_node_acl pointers
2433 pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
2435 pr_err("SPC-3 PR: Unable to locate"
2436 " PR_REGISTERED *pr_reg for RELEASE\n");
2437 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2440 * From spc4r17 Section 5.7.11.2 Releasing:
2442 * If there is no persistent reservation or in response to a persistent
2443 * reservation release request from a registered I_T nexus that is not a
2444 * persistent reservation holder (see 5.7.10), the device server shall
2447 * a) Not release the persistent reservation, if any;
2448 * b) Not remove any registrations; and
2449 * c) Complete the command with GOOD status.
2451 spin_lock(&dev->dev_reservation_lock);
2452 pr_res_holder = dev->dev_pr_res_holder;
2453 if (!pr_res_holder) {
2455 * No persistent reservation, return GOOD status.
2457 spin_unlock(&dev->dev_reservation_lock);
2458 goto out_put_pr_reg;
2460 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2461 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
2464 if ((all_reg == 0) && (pr_res_holder != pr_reg)) {
2466 * Non 'All Registrants' PR Type cases..
2467 * Release request from a registered I_T nexus that is not a
2468 * persistent reservation holder. return GOOD status.
2470 spin_unlock(&dev->dev_reservation_lock);
2471 goto out_put_pr_reg;
2475 * From spc4r17 Section 5.7.11.2 Releasing:
2477 * Only the persistent reservation holder (see 5.7.10) is allowed to
2478 * release a persistent reservation.
2480 * An application client releases the persistent reservation by issuing
2481 * a PERSISTENT RESERVE OUT command with RELEASE service action through
2482 * an I_T nexus that is a persistent reservation holder with the
2483 * following parameters:
2485 * a) RESERVATION KEY field set to the value of the reservation key
2486 * that is registered with the logical unit for the I_T nexus;
2488 if (res_key != pr_reg->pr_res_key) {
2489 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
2490 " does not match existing SA REGISTER res_key:"
2491 " 0x%016Lx\n", res_key, pr_reg->pr_res_key);
2492 spin_unlock(&dev->dev_reservation_lock);
2493 ret = TCM_RESERVATION_CONFLICT;
2494 goto out_put_pr_reg;
2497 * From spc4r17 Section 5.7.11.2 Releasing and above:
2499 * b) TYPE field and SCOPE field set to match the persistent
2500 * reservation being released.
2502 if ((pr_res_holder->pr_res_type != type) ||
2503 (pr_res_holder->pr_res_scope != scope)) {
2504 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2505 pr_err("SPC-3 PR RELEASE: Attempted to release"
2506 " reservation from [%s]: %s with different TYPE "
2507 "and/or SCOPE while reservation already held by"
2508 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2509 cmd->se_tfo->get_fabric_name(),
2510 se_sess->se_node_acl->initiatorname,
2511 pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
2512 pr_res_holder->pr_reg_nacl->initiatorname);
2514 spin_unlock(&dev->dev_reservation_lock);
2515 ret = TCM_RESERVATION_CONFLICT;
2516 goto out_put_pr_reg;
2519 * In response to a persistent reservation release request from the
2520 * persistent reservation holder the device server shall perform a
2521 * release by doing the following as an uninterrupted series of actions:
2522 * a) Release the persistent reservation;
2523 * b) Not remove any registration(s);
2524 * c) If the released persistent reservation is a registrants only type
2525 * or all registrants type persistent reservation,
2526 * the device server shall establish a unit attention condition for
2527 * the initiator port associated with every regis-
2528 * tered I_T nexus other than I_T nexus on which the PERSISTENT
2529 * RESERVE OUT command with RELEASE service action was received,
2530 * with the additional sense code set to RESERVATIONS RELEASED; and
2531 * d) If the persistent reservation is of any other type, the device
2532 * server shall not establish a unit attention condition.
2534 __core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
2537 spin_unlock(&dev->dev_reservation_lock);
2539 if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
2540 (type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
2541 (type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
2542 (type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
2544 * If no UNIT ATTENTION conditions will be established for
2545 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2546 * go ahead and check for APTPL=1 update+write below
2551 spin_lock(&pr_tmpl->registration_lock);
2552 list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
2555 * Do not establish a UNIT ATTENTION condition
2556 * for the calling I_T Nexus
2558 if (pr_reg_p == pr_reg)
2561 core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl,
2562 pr_reg_p->pr_res_mapped_lun,
2563 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
2565 spin_unlock(&pr_tmpl->registration_lock);
2568 if (pr_tmpl->pr_aptpl_active)
2569 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2572 core_scsi3_put_pr_reg(pr_reg);
2576 static sense_reason_t
2577 core_scsi3_emulate_pro_clear(struct se_cmd *cmd, u64 res_key)
2579 struct se_device *dev = cmd->se_dev;
2580 struct se_node_acl *pr_reg_nacl;
2581 struct se_session *se_sess = cmd->se_sess;
2582 struct t10_reservation *pr_tmpl = &dev->t10_pr;
2583 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2584 u32 pr_res_mapped_lun = 0;
2585 int calling_it_nexus = 0;
2587 * Locate the existing *pr_reg via struct se_node_acl pointers
2589 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
2590 se_sess->se_node_acl, se_sess);
2592 pr_err("SPC-3 PR: Unable to locate"
2593 " PR_REGISTERED *pr_reg for CLEAR\n");
2594 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2597 * From spc4r17 section 5.7.11.6, Clearing:
2599 * Any application client may release the persistent reservation and
2600 * remove all registrations from a device server by issuing a
2601 * PERSISTENT RESERVE OUT command with CLEAR service action through a
2602 * registered I_T nexus with the following parameter:
2604 * a) RESERVATION KEY field set to the value of the reservation key
2605 * that is registered with the logical unit for the I_T nexus.
2607 if (res_key != pr_reg_n->pr_res_key) {
2608 pr_err("SPC-3 PR REGISTER: Received"
2609 " res_key: 0x%016Lx does not match"
2610 " existing SA REGISTER res_key:"
2611 " 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
2612 core_scsi3_put_pr_reg(pr_reg_n);
2613 return TCM_RESERVATION_CONFLICT;
2616 * a) Release the persistent reservation, if any;
2618 spin_lock(&dev->dev_reservation_lock);
2619 pr_res_holder = dev->dev_pr_res_holder;
2620 if (pr_res_holder) {
2621 struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
2622 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
2625 spin_unlock(&dev->dev_reservation_lock);
2627 * b) Remove all registration(s) (see spc4r17 5.7.7);
2629 spin_lock(&pr_tmpl->registration_lock);
2630 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2631 &pr_tmpl->registration_list, pr_reg_list) {
2633 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2634 pr_reg_nacl = pr_reg->pr_reg_nacl;
2635 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2636 __core_scsi3_free_registration(dev, pr_reg, NULL,
2639 * e) Establish a unit attention condition for the initiator
2640 * port associated with every registered I_T nexus other
2641 * than the I_T nexus on which the PERSISTENT RESERVE OUT
2642 * command with CLEAR service action was received, with the
2643 * additional sense code set to RESERVATIONS PREEMPTED.
2645 if (!calling_it_nexus)
2646 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun,
2647 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
2649 spin_unlock(&pr_tmpl->registration_lock);
2651 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
2652 cmd->se_tfo->get_fabric_name());
2654 core_scsi3_update_and_write_aptpl(cmd->se_dev, false);
2656 core_scsi3_pr_generation(dev);
2661 * Called with struct se_device->dev_reservation_lock held.
2663 static void __core_scsi3_complete_pro_preempt(
2664 struct se_device *dev,
2665 struct t10_pr_registration *pr_reg,
2666 struct list_head *preempt_and_abort_list,
2669 enum preempt_type preempt_type)
2671 struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
2672 struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
2673 char i_buf[PR_REG_ISID_ID_LEN];
2675 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
2676 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
2678 * Do an implicit RELEASE of the existing reservation.
2680 if (dev->dev_pr_res_holder)
2681 __core_scsi3_complete_pro_release(dev, nacl,
2682 dev->dev_pr_res_holder, 0);
2684 dev->dev_pr_res_holder = pr_reg;
2685 pr_reg->pr_res_holder = 1;
2686 pr_reg->pr_res_type = type;
2687 pr_reg->pr_res_scope = scope;
2689 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
2690 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2691 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
2692 core_scsi3_pr_dump_type(type),
2693 (pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
2694 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
2695 tfo->get_fabric_name(), (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
2696 nacl->initiatorname, i_buf);
2698 * For PREEMPT_AND_ABORT, add the preempting reservation's
2699 * struct t10_pr_registration to the list that will be compared
2700 * against received CDBs..
2702 if (preempt_and_abort_list)
2703 list_add_tail(&pr_reg->pr_reg_abort_list,
2704 preempt_and_abort_list);
2707 static void core_scsi3_release_preempt_and_abort(
2708 struct list_head *preempt_and_abort_list,
2709 struct t10_pr_registration *pr_reg_holder)
2711 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
2713 list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
2714 pr_reg_abort_list) {
2716 list_del(&pr_reg->pr_reg_abort_list);
2717 if (pr_reg_holder == pr_reg)
2719 if (pr_reg->pr_res_holder) {
2720 pr_warn("pr_reg->pr_res_holder still set\n");
2724 pr_reg->pr_reg_deve = NULL;
2725 pr_reg->pr_reg_nacl = NULL;
2726 kmem_cache_free(t10_pr_reg_cache, pr_reg);
2730 static sense_reason_t
2731 core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key,
2732 u64 sa_res_key, enum preempt_type preempt_type)
2734 struct se_device *dev = cmd->se_dev;
2735 struct se_node_acl *pr_reg_nacl;
2736 struct se_session *se_sess = cmd->se_sess;
2737 LIST_HEAD(preempt_and_abort_list);
2738 struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
2739 struct t10_reservation *pr_tmpl = &dev->t10_pr;
2740 u32 pr_res_mapped_lun = 0;
2741 int all_reg = 0, calling_it_nexus = 0, released_regs = 0;
2742 int prh_type = 0, prh_scope = 0;
2745 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2747 pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
2750 pr_err("SPC-3 PR: Unable to locate"
2751 " PR_REGISTERED *pr_reg for PREEMPT%s\n",
2752 (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "");
2753 return TCM_RESERVATION_CONFLICT;
2755 if (pr_reg_n->pr_res_key != res_key) {
2756 core_scsi3_put_pr_reg(pr_reg_n);
2757 return TCM_RESERVATION_CONFLICT;
2759 if (scope != PR_SCOPE_LU_SCOPE) {
2760 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
2761 core_scsi3_put_pr_reg(pr_reg_n);
2762 return TCM_INVALID_PARAMETER_LIST;
2765 spin_lock(&dev->dev_reservation_lock);
2766 pr_res_holder = dev->dev_pr_res_holder;
2767 if (pr_res_holder &&
2768 ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
2769 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
2772 if (!all_reg && !sa_res_key) {
2773 spin_unlock(&dev->dev_reservation_lock);
2774 core_scsi3_put_pr_reg(pr_reg_n);
2775 return TCM_INVALID_PARAMETER_LIST;
2778 * From spc4r17, section 5.7.11.4.4 Removing Registrations:
2780 * If the SERVICE ACTION RESERVATION KEY field does not identify a
2781 * persistent reservation holder or there is no persistent reservation
2782 * holder (i.e., there is no persistent reservation), then the device
2783 * server shall perform a preempt by doing the following in an
2784 * uninterrupted series of actions. (See below..)
2786 if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
2788 * No existing or SA Reservation Key matching reservations..
2790 * PROUT SA PREEMPT with All Registrant type reservations are
2791 * allowed to be processed without a matching SA Reservation Key
2793 spin_lock(&pr_tmpl->registration_lock);
2794 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2795 &pr_tmpl->registration_list, pr_reg_list) {
2797 * Removing of registrations in non all registrants
2798 * type reservations without a matching SA reservation
2801 * a) Remove the registrations for all I_T nexuses
2802 * specified by the SERVICE ACTION RESERVATION KEY
2804 * b) Ignore the contents of the SCOPE and TYPE fields;
2805 * c) Process tasks as defined in 5.7.1; and
2806 * d) Establish a unit attention condition for the
2807 * initiator port associated with every I_T nexus
2808 * that lost its registration other than the I_T
2809 * nexus on which the PERSISTENT RESERVE OUT command
2810 * was received, with the additional sense code set
2811 * to REGISTRATIONS PREEMPTED.
2814 if (pr_reg->pr_res_key != sa_res_key)
2817 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2818 pr_reg_nacl = pr_reg->pr_reg_nacl;
2819 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2820 __core_scsi3_free_registration(dev, pr_reg,
2821 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
2822 NULL, calling_it_nexus);
2826 * Case for any existing all registrants type
2827 * reservation, follow logic in spc4r17 section
2828 * 5.7.11.4 Preempting, Table 52 and Figure 7.
2830 * For a ZERO SA Reservation key, release
2831 * all other registrations and do an implicit
2832 * release of active persistent reservation.
2834 * For a non-ZERO SA Reservation key, only
2835 * release the matching reservation key from
2839 (pr_reg->pr_res_key != sa_res_key))
2842 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2843 if (calling_it_nexus)
2846 pr_reg_nacl = pr_reg->pr_reg_nacl;
2847 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2848 __core_scsi3_free_registration(dev, pr_reg,
2849 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
2853 if (!calling_it_nexus)
2854 core_scsi3_ua_allocate(pr_reg_nacl,
2855 pr_res_mapped_lun, 0x2A,
2856 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
2858 spin_unlock(&pr_tmpl->registration_lock);
2860 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
2861 * a PREEMPT AND ABORT service action sets the SERVICE ACTION
2862 * RESERVATION KEY field to a value that does not match any
2863 * registered reservation key, then the device server shall
2864 * complete the command with RESERVATION CONFLICT status.
2866 if (!released_regs) {
2867 spin_unlock(&dev->dev_reservation_lock);
2868 core_scsi3_put_pr_reg(pr_reg_n);
2869 return TCM_RESERVATION_CONFLICT;
2872 * For an existing all registrants type reservation
2873 * with a zero SA rservation key, preempt the existing
2874 * reservation with the new PR type and scope.
2876 if (pr_res_holder && all_reg && !(sa_res_key)) {
2877 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
2878 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
2879 type, scope, preempt_type);
2881 if (preempt_type == PREEMPT_AND_ABORT)
2882 core_scsi3_release_preempt_and_abort(
2883 &preempt_and_abort_list, pr_reg_n);
2885 spin_unlock(&dev->dev_reservation_lock);
2887 if (pr_tmpl->pr_aptpl_active)
2888 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
2890 core_scsi3_put_pr_reg(pr_reg_n);
2891 core_scsi3_pr_generation(cmd->se_dev);
2895 * The PREEMPTing SA reservation key matches that of the
2896 * existing persistent reservation, first, we check if
2897 * we are preempting our own reservation.
2898 * From spc4r17, section 5.7.11.4.3 Preempting
2899 * persistent reservations and registration handling
2901 * If an all registrants persistent reservation is not
2902 * present, it is not an error for the persistent
2903 * reservation holder to preempt itself (i.e., a
2904 * PERSISTENT RESERVE OUT with a PREEMPT service action
2905 * or a PREEMPT AND ABORT service action with the
2906 * SERVICE ACTION RESERVATION KEY value equal to the
2907 * persistent reservation holder's reservation key that
2908 * is received from the persistent reservation holder).
2909 * In that case, the device server shall establish the
2910 * new persistent reservation and maintain the
2913 prh_type = pr_res_holder->pr_res_type;
2914 prh_scope = pr_res_holder->pr_res_scope;
2916 * If the SERVICE ACTION RESERVATION KEY field identifies a
2917 * persistent reservation holder (see 5.7.10), the device
2918 * server shall perform a preempt by doing the following as
2919 * an uninterrupted series of actions:
2921 * a) Release the persistent reservation for the holder
2922 * identified by the SERVICE ACTION RESERVATION KEY field;
2924 if (pr_reg_n != pr_res_holder)
2925 __core_scsi3_complete_pro_release(dev,
2926 pr_res_holder->pr_reg_nacl,
2927 dev->dev_pr_res_holder, 0);
2929 * b) Remove the registrations for all I_T nexuses identified
2930 * by the SERVICE ACTION RESERVATION KEY field, except the
2931 * I_T nexus that is being used for the PERSISTENT RESERVE
2932 * OUT command. If an all registrants persistent reservation
2933 * is present and the SERVICE ACTION RESERVATION KEY field
2934 * is set to zero, then all registrations shall be removed
2935 * except for that of the I_T nexus that is being used for
2936 * the PERSISTENT RESERVE OUT command;
2938 spin_lock(&pr_tmpl->registration_lock);
2939 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2940 &pr_tmpl->registration_list, pr_reg_list) {
2942 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2943 if (calling_it_nexus)
2946 if (pr_reg->pr_res_key != sa_res_key)
2949 pr_reg_nacl = pr_reg->pr_reg_nacl;
2950 pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
2951 __core_scsi3_free_registration(dev, pr_reg,
2952 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
2955 * e) Establish a unit attention condition for the initiator
2956 * port associated with every I_T nexus that lost its
2957 * persistent reservation and/or registration, with the
2958 * additional sense code set to REGISTRATIONS PREEMPTED;
2960 core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
2961 ASCQ_2AH_REGISTRATIONS_PREEMPTED);
2963 spin_unlock(&pr_tmpl->registration_lock);
2965 * c) Establish a persistent reservation for the preempting
2966 * I_T nexus using the contents of the SCOPE and TYPE fields;
2968 __core_scsi3_complete_pro_preempt(dev, pr_reg_n,
2969 (preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
2970 type, scope, preempt_type);
2972 * d) Process tasks as defined in 5.7.1;
2974 * f) If the type or scope has changed, then for every I_T nexus
2975 * whose reservation key was not removed, except for the I_T
2976 * nexus on which the PERSISTENT RESERVE OUT command was
2977 * received, the device server shall establish a unit
2978 * attention condition for the initiator port associated with
2979 * that I_T nexus, with the additional sense code set to
2980 * RESERVATIONS RELEASED. If the type or scope have not
2981 * changed, then no unit attention condition(s) shall be
2982 * established for this reason.
2984 if ((prh_type != type) || (prh_scope != scope)) {
2985 spin_lock(&pr_tmpl->registration_lock);
2986 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
2987 &pr_tmpl->registration_list, pr_reg_list) {
2989 calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
2990 if (calling_it_nexus)
2993 core_scsi3_ua_allocate(pr_reg->pr_reg_nacl,
2994 pr_reg->pr_res_mapped_lun, 0x2A,
2995 ASCQ_2AH_RESERVATIONS_RELEASED);
2997 spin_unlock(&pr_tmpl->registration_lock);
2999 spin_unlock(&dev->dev_reservation_lock);
3001 * Call LUN_RESET logic upon list of struct t10_pr_registration,
3002 * All received CDBs for the matching existing reservation and
3003 * registrations undergo ABORT_TASK logic.
3005 * From there, core_scsi3_release_preempt_and_abort() will
3006 * release every registration in the list (which have already
3007 * been removed from the primary pr_reg list), except the
3008 * new persistent reservation holder, the calling Initiator Port.
3010 if (preempt_type == PREEMPT_AND_ABORT) {
3011 core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
3012 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
3016 if (pr_tmpl->pr_aptpl_active)
3017 core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
3019 core_scsi3_put_pr_reg(pr_reg_n);
3020 core_scsi3_pr_generation(cmd->se_dev);
3024 static sense_reason_t
3025 core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope,
3026 u64 res_key, u64 sa_res_key, enum preempt_type preempt_type)
3029 case PR_TYPE_WRITE_EXCLUSIVE:
3030 case PR_TYPE_EXCLUSIVE_ACCESS:
3031 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
3032 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
3033 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
3034 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
3035 return core_scsi3_pro_preempt(cmd, type, scope, res_key,
3036 sa_res_key, preempt_type);
3038 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
3039 " Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type);
3040 return TCM_INVALID_CDB_FIELD;
3045 static sense_reason_t
3046 core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key,
3047 u64 sa_res_key, int aptpl, int unreg)
3049 struct se_session *se_sess = cmd->se_sess;
3050 struct se_device *dev = cmd->se_dev;
3051 struct se_dev_entry *dest_se_deve = NULL;
3052 struct se_lun *se_lun = cmd->se_lun;
3053 struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
3054 struct se_port *se_port;
3055 struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
3056 struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
3057 struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
3058 struct t10_reservation *pr_tmpl = &dev->t10_pr;
3060 unsigned char *initiator_str;
3061 char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
3062 u32 tid_len, tmp_tid_len;
3063 int new_reg = 0, type, scope, matching_iname;
3065 unsigned short rtpi;
3066 unsigned char proto_ident;
3068 if (!se_sess || !se_lun) {
3069 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
3070 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3073 memset(dest_iport, 0, 64);
3074 memset(i_buf, 0, PR_REG_ISID_ID_LEN);
3075 se_tpg = se_sess->se_tpg;
3076 tf_ops = se_tpg->se_tpg_tfo;
3078 * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3079 * Register behaviors for a REGISTER AND MOVE service action
3081 * Locate the existing *pr_reg via struct se_node_acl pointers
3083 pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
3086 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
3087 " *pr_reg for REGISTER_AND_MOVE\n");
3088 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3091 * The provided reservation key much match the existing reservation key
3092 * provided during this initiator's I_T nexus registration.
3094 if (res_key != pr_reg->pr_res_key) {
3095 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
3096 " res_key: 0x%016Lx does not match existing SA REGISTER"
3097 " res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
3098 ret = TCM_RESERVATION_CONFLICT;
3099 goto out_put_pr_reg;
3102 * The service active reservation key needs to be non zero
3105 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
3107 ret = TCM_INVALID_PARAMETER_LIST;
3108 goto out_put_pr_reg;
3112 * Determine the Relative Target Port Identifier where the reservation
3113 * will be moved to for the TransportID containing SCSI initiator WWN
3116 buf = transport_kmap_data_sg(cmd);
3118 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3119 goto out_put_pr_reg;
3122 rtpi = (buf[18] & 0xff) << 8;
3123 rtpi |= buf[19] & 0xff;
3124 tid_len = (buf[20] & 0xff) << 24;
3125 tid_len |= (buf[21] & 0xff) << 16;
3126 tid_len |= (buf[22] & 0xff) << 8;
3127 tid_len |= buf[23] & 0xff;
3128 transport_kunmap_data_sg(cmd);
3131 if ((tid_len + 24) != cmd->data_length) {
3132 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
3133 " does not equal CDB data_length: %u\n", tid_len,
3135 ret = TCM_INVALID_PARAMETER_LIST;
3136 goto out_put_pr_reg;
3139 spin_lock(&dev->se_port_lock);
3140 list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) {
3141 if (se_port->sep_rtpi != rtpi)
3143 dest_se_tpg = se_port->sep_tpg;
3146 dest_tf_ops = dest_se_tpg->se_tpg_tfo;
3150 atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count);
3151 spin_unlock(&dev->se_port_lock);
3153 if (core_scsi3_tpg_depend_item(dest_se_tpg)) {
3154 pr_err("core_scsi3_tpg_depend_item() failed"
3155 " for dest_se_tpg\n");
3156 atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count);
3157 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3158 goto out_put_pr_reg;
3161 spin_lock(&dev->se_port_lock);
3164 spin_unlock(&dev->se_port_lock);
3166 if (!dest_se_tpg || !dest_tf_ops) {
3167 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3168 " fabric ops from Relative Target Port Identifier:"
3170 ret = TCM_INVALID_PARAMETER_LIST;
3171 goto out_put_pr_reg;
3174 buf = transport_kmap_data_sg(cmd);
3176 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3177 goto out_put_pr_reg;
3179 proto_ident = (buf[24] & 0x0f);
3181 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
3182 " 0x%02x\n", proto_ident);
3184 if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) {
3185 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
3186 " proto_ident: 0x%02x does not match ident: 0x%02x"
3187 " from fabric: %s\n", proto_ident,
3188 dest_tf_ops->get_fabric_proto_ident(dest_se_tpg),
3189 dest_tf_ops->get_fabric_name());
3190 ret = TCM_INVALID_PARAMETER_LIST;
3193 if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) {
3194 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not"
3195 " containg a valid tpg_parse_pr_out_transport_id"
3196 " function pointer\n");
3197 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3200 initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg,
3201 (const char *)&buf[24], &tmp_tid_len, &iport_ptr);
3202 if (!initiator_str) {
3203 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3204 " initiator_str from Transport ID\n");
3205 ret = TCM_INVALID_PARAMETER_LIST;
3209 transport_kunmap_data_sg(cmd);
3212 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
3213 " %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
3214 "port" : "device", initiator_str, (iport_ptr != NULL) ?
3217 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3218 * action specifies a TransportID that is the same as the initiator port
3219 * of the I_T nexus for the command received, then the command shall
3220 * be terminated with CHECK CONDITION status, with the sense key set to
3221 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3222 * IN PARAMETER LIST.
3224 pr_reg_nacl = pr_reg->pr_reg_nacl;
3225 matching_iname = (!strcmp(initiator_str,
3226 pr_reg_nacl->initiatorname)) ? 1 : 0;
3227 if (!matching_iname)
3228 goto after_iport_check;
3230 if (!iport_ptr || !pr_reg->isid_present_at_reg) {
3231 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
3232 " matches: %s on received I_T Nexus\n", initiator_str,
3233 pr_reg_nacl->initiatorname);
3234 ret = TCM_INVALID_PARAMETER_LIST;
3237 if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
3238 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
3239 " matches: %s %s on received I_T Nexus\n",
3240 initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
3241 pr_reg->pr_reg_isid);
3242 ret = TCM_INVALID_PARAMETER_LIST;
3247 * Locate the destination struct se_node_acl from the received Transport ID
3249 spin_lock_irq(&dest_se_tpg->acl_node_lock);
3250 dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
3253 atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
3254 spin_unlock_irq(&dest_se_tpg->acl_node_lock);
3256 if (!dest_node_acl) {
3257 pr_err("Unable to locate %s dest_node_acl for"
3258 " TransportID%s\n", dest_tf_ops->get_fabric_name(),
3260 ret = TCM_INVALID_PARAMETER_LIST;
3264 if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
3265 pr_err("core_scsi3_nodeacl_depend_item() for"
3266 " dest_node_acl\n");
3267 atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
3268 dest_node_acl = NULL;
3269 ret = TCM_INVALID_PARAMETER_LIST;
3273 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
3274 " %s from TransportID\n", dest_tf_ops->get_fabric_name(),
3275 dest_node_acl->initiatorname);
3278 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3281 dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
3282 if (!dest_se_deve) {
3283 pr_err("Unable to locate %s dest_se_deve from RTPI:"
3284 " %hu\n", dest_tf_ops->get_fabric_name(), rtpi);
3285 ret = TCM_INVALID_PARAMETER_LIST;
3289 if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
3290 pr_err("core_scsi3_lunacl_depend_item() failed\n");
3291 atomic_dec_mb(&dest_se_deve->pr_ref_count);
3292 dest_se_deve = NULL;
3293 ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3297 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
3298 " ACL for dest_se_deve->mapped_lun: %u\n",
3299 dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
3300 dest_se_deve->mapped_lun);
3303 * A persistent reservation needs to already existing in order to
3304 * successfully complete the REGISTER_AND_MOVE service action..
3306 spin_lock(&dev->dev_reservation_lock);
3307 pr_res_holder = dev->dev_pr_res_holder;
3308 if (!pr_res_holder) {
3309 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
3310 " currently held\n");
3311 spin_unlock(&dev->dev_reservation_lock);
3312 ret = TCM_INVALID_CDB_FIELD;
3316 * The received on I_T Nexus must be the reservation holder.
3318 * From spc4r17 section 5.7.8 Table 50 --
3319 * Register behaviors for a REGISTER AND MOVE service action
3321 if (pr_res_holder != pr_reg) {
3322 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
3323 " Nexus is not reservation holder\n");
3324 spin_unlock(&dev->dev_reservation_lock);
3325 ret = TCM_RESERVATION_CONFLICT;
3329 * From spc4r17 section 5.7.8: registering and moving reservation
3331 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3332 * action is received and the established persistent reservation is a
3333 * Write Exclusive - All Registrants type or Exclusive Access -
3334 * All Registrants type reservation, then the command shall be completed
3335 * with RESERVATION CONFLICT status.
3337 if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3338 (pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
3339 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
3340 " reservation for type: %s\n",
3341 core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
3342 spin_unlock(&dev->dev_reservation_lock);
3343 ret = TCM_RESERVATION_CONFLICT;
3346 pr_res_nacl = pr_res_holder->pr_reg_nacl;
3348 * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3350 type = pr_res_holder->pr_res_type;
3351 scope = pr_res_holder->pr_res_type;
3353 * c) Associate the reservation key specified in the SERVICE ACTION
3354 * RESERVATION KEY field with the I_T nexus specified as the
3355 * destination of the register and move, where:
3356 * A) The I_T nexus is specified by the TransportID and the
3357 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3358 * B) Regardless of the TransportID format used, the association for
3359 * the initiator port is based on either the initiator port name
3360 * (see 3.1.71) on SCSI transport protocols where port names are
3361 * required or the initiator port identifier (see 3.1.70) on SCSI
3362 * transport protocols where port names are not required;
3363 * d) Register the reservation key specified in the SERVICE ACTION
3364 * RESERVATION KEY field;
3365 * e) Retain the reservation key specified in the SERVICE ACTION
3366 * RESERVATION KEY field and associated information;
3368 * Also, It is not an error for a REGISTER AND MOVE service action to
3369 * register an I_T nexus that is already registered with the same
3370 * reservation key or a different reservation key.
3372 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3375 if (core_scsi3_alloc_registration(cmd->se_dev,
3376 dest_node_acl, dest_se_deve, iport_ptr,
3377 sa_res_key, 0, aptpl, 2, 1)) {
3378 spin_unlock(&dev->dev_reservation_lock);
3379 ret = TCM_INVALID_PARAMETER_LIST;
3382 dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
3387 * f) Release the persistent reservation for the persistent reservation
3388 * holder (i.e., the I_T nexus on which the
3390 __core_scsi3_complete_pro_release(dev, pr_res_nacl,
3391 dev->dev_pr_res_holder, 0);
3393 * g) Move the persistent reservation to the specified I_T nexus using
3394 * the same scope and type as the persistent reservation released in
3397 dev->dev_pr_res_holder = dest_pr_reg;
3398 dest_pr_reg->pr_res_holder = 1;
3399 dest_pr_reg->pr_res_type = type;
3400 pr_reg->pr_res_scope = scope;
3401 core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
3403 * Increment PRGeneration for existing registrations..
3406 dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
3407 spin_unlock(&dev->dev_reservation_lock);
3409 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
3410 " created new reservation holder TYPE: %s on object RTPI:"
3411 " %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
3412 core_scsi3_pr_dump_type(type), rtpi,
3413 dest_pr_reg->pr_res_generation);
3414 pr_debug("SPC-3 PR Successfully moved reservation from"
3415 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3416 tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
3417 i_buf, dest_tf_ops->get_fabric_name(),
3418 dest_node_acl->initiatorname, (iport_ptr != NULL) ?
3421 * It is now safe to release configfs group dependencies for destination
3422 * of Transport ID Initiator Device/Port Identifier
3424 core_scsi3_lunacl_undepend_item(dest_se_deve);
3425 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3426 core_scsi3_tpg_undepend_item(dest_se_tpg);
3428 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3429 * nexus on which PERSISTENT RESERVE OUT command was received.
3432 spin_lock(&pr_tmpl->registration_lock);
3433 __core_scsi3_free_registration(dev, pr_reg, NULL, 1);
3434 spin_unlock(&pr_tmpl->registration_lock);
3436 core_scsi3_put_pr_reg(pr_reg);
3438 core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl);
3440 transport_kunmap_data_sg(cmd);
3442 core_scsi3_put_pr_reg(dest_pr_reg);
3446 transport_kunmap_data_sg(cmd);
3448 core_scsi3_lunacl_undepend_item(dest_se_deve);
3450 core_scsi3_nodeacl_undepend_item(dest_node_acl);
3451 core_scsi3_tpg_undepend_item(dest_se_tpg);
3454 core_scsi3_put_pr_reg(pr_reg);
3458 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
3460 unsigned int __v1, __v2;
3462 __v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
3463 __v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
3465 return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
3469 * See spc4r17 section 6.14 Table 170
3472 target_scsi3_emulate_pr_out(struct se_cmd *cmd)
3474 struct se_device *dev = cmd->se_dev;
3475 unsigned char *cdb = &cmd->t_task_cdb[0];
3477 u64 res_key, sa_res_key;
3478 int sa, scope, type, aptpl;
3479 int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
3483 * Following spc2r20 5.5.1 Reservations overview:
3485 * If a logical unit has been reserved by any RESERVE command and is
3486 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3487 * PERSISTENT RESERVE OUT commands shall conflict regardless of
3488 * initiator or service action and shall terminate with a RESERVATION
3491 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
3492 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3493 " SPC-2 reservation is held, returning"
3494 " RESERVATION_CONFLICT\n");
3495 return TCM_RESERVATION_CONFLICT;
3499 * FIXME: A NULL struct se_session pointer means an this is not coming from
3500 * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3503 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3505 if (cmd->data_length < 24) {
3506 pr_warn("SPC-PR: Received PR OUT parameter list"
3507 " length too small: %u\n", cmd->data_length);
3508 return TCM_INVALID_PARAMETER_LIST;
3512 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3514 sa = (cdb[1] & 0x1f);
3515 scope = (cdb[2] & 0xf0);
3516 type = (cdb[2] & 0x0f);
3518 buf = transport_kmap_data_sg(cmd);
3520 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3523 * From PERSISTENT_RESERVE_OUT parameter list (payload)
3525 res_key = core_scsi3_extract_reservation_key(&buf[0]);
3526 sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
3528 * REGISTER_AND_MOVE uses a different SA parameter list containing
3529 * SCSI TransportIDs.
3531 if (sa != PRO_REGISTER_AND_MOVE) {
3532 spec_i_pt = (buf[20] & 0x08);
3533 all_tg_pt = (buf[20] & 0x04);
3534 aptpl = (buf[20] & 0x01);
3536 aptpl = (buf[17] & 0x01);
3537 unreg = (buf[17] & 0x02);
3540 * If the backend device has been configured to force APTPL metadata
3541 * write-out, go ahead and propigate aptpl=1 down now.
3543 if (dev->dev_attrib.force_pr_aptpl)
3546 transport_kunmap_data_sg(cmd);
3550 * SPEC_I_PT=1 is only valid for Service action: REGISTER
3552 if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER))
3553 return TCM_INVALID_PARAMETER_LIST;
3556 * From spc4r17 section 6.14:
3558 * If the SPEC_I_PT bit is set to zero, the service action is not
3559 * REGISTER AND MOVE, and the parameter list length is not 24, then
3560 * the command shall be terminated with CHECK CONDITION status, with
3561 * the sense key set to ILLEGAL REQUEST, and the additional sense
3562 * code set to PARAMETER LIST LENGTH ERROR.
3564 if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
3565 (cmd->data_length != 24)) {
3566 pr_warn("SPC-PR: Received PR OUT illegal parameter"
3567 " list length: %u\n", cmd->data_length);
3568 return TCM_INVALID_PARAMETER_LIST;
3572 * (core_scsi3_emulate_pro_* function parameters
3573 * are defined by spc4r17 Table 174:
3574 * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3578 ret = core_scsi3_emulate_pro_register(cmd,
3579 res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER);
3582 ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
3585 ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
3588 ret = core_scsi3_emulate_pro_clear(cmd, res_key);
3591 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3592 res_key, sa_res_key, PREEMPT);
3594 case PRO_PREEMPT_AND_ABORT:
3595 ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
3596 res_key, sa_res_key, PREEMPT_AND_ABORT);
3598 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
3599 ret = core_scsi3_emulate_pro_register(cmd,
3600 0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, REGISTER_AND_IGNORE_EXISTING_KEY);
3602 case PRO_REGISTER_AND_MOVE:
3603 ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
3604 sa_res_key, aptpl, unreg);
3607 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
3608 " action: 0x%02x\n", cdb[1] & 0x1f);
3609 return TCM_INVALID_CDB_FIELD;
3613 target_complete_cmd(cmd, GOOD);
3618 * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3620 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3622 static sense_reason_t
3623 core_scsi3_pri_read_keys(struct se_cmd *cmd)
3625 struct se_device *dev = cmd->se_dev;
3626 struct t10_pr_registration *pr_reg;
3628 u32 add_len = 0, off = 8;
3630 if (cmd->data_length < 8) {
3631 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
3632 " too small\n", cmd->data_length);
3633 return TCM_INVALID_CDB_FIELD;
3636 buf = transport_kmap_data_sg(cmd);
3638 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3640 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3641 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3642 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3643 buf[3] = (dev->t10_pr.pr_generation & 0xff);
3645 spin_lock(&dev->t10_pr.registration_lock);
3646 list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
3649 * Check for overflow of 8byte PRI READ_KEYS payload and
3650 * next reservation key list descriptor.
3652 if ((add_len + 8) > (cmd->data_length - 8))
3655 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3656 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3657 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3658 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3659 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3660 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3661 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3662 buf[off++] = (pr_reg->pr_res_key & 0xff);
3666 spin_unlock(&dev->t10_pr.registration_lock);
3668 buf[4] = ((add_len >> 24) & 0xff);
3669 buf[5] = ((add_len >> 16) & 0xff);
3670 buf[6] = ((add_len >> 8) & 0xff);
3671 buf[7] = (add_len & 0xff);
3673 transport_kunmap_data_sg(cmd);
3679 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3681 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3683 static sense_reason_t
3684 core_scsi3_pri_read_reservation(struct se_cmd *cmd)
3686 struct se_device *dev = cmd->se_dev;
3687 struct t10_pr_registration *pr_reg;
3690 u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
3692 if (cmd->data_length < 8) {
3693 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
3694 " too small\n", cmd->data_length);
3695 return TCM_INVALID_CDB_FIELD;
3698 buf = transport_kmap_data_sg(cmd);
3700 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3702 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3703 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3704 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3705 buf[3] = (dev->t10_pr.pr_generation & 0xff);
3707 spin_lock(&dev->dev_reservation_lock);
3708 pr_reg = dev->dev_pr_res_holder;
3711 * Set the hardcoded Additional Length
3713 buf[4] = ((add_len >> 24) & 0xff);
3714 buf[5] = ((add_len >> 16) & 0xff);
3715 buf[6] = ((add_len >> 8) & 0xff);
3716 buf[7] = (add_len & 0xff);
3718 if (cmd->data_length < 22)
3722 * Set the Reservation key.
3724 * From spc4r17, section 5.7.10:
3725 * A persistent reservation holder has its reservation key
3726 * returned in the parameter data from a PERSISTENT
3727 * RESERVE IN command with READ RESERVATION service action as
3729 * a) For a persistent reservation of the type Write Exclusive
3730 * - All Registrants or Exclusive Access  All Regitrants,
3731 * the reservation key shall be set to zero; or
3732 * b) For all other persistent reservation types, the
3733 * reservation key shall be set to the registered
3734 * reservation key for the I_T nexus that holds the
3735 * persistent reservation.
3737 if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
3738 (pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
3741 pr_res_key = pr_reg->pr_res_key;
3743 buf[8] = ((pr_res_key >> 56) & 0xff);
3744 buf[9] = ((pr_res_key >> 48) & 0xff);
3745 buf[10] = ((pr_res_key >> 40) & 0xff);
3746 buf[11] = ((pr_res_key >> 32) & 0xff);
3747 buf[12] = ((pr_res_key >> 24) & 0xff);
3748 buf[13] = ((pr_res_key >> 16) & 0xff);
3749 buf[14] = ((pr_res_key >> 8) & 0xff);
3750 buf[15] = (pr_res_key & 0xff);
3752 * Set the SCOPE and TYPE
3754 buf[21] = (pr_reg->pr_res_scope & 0xf0) |
3755 (pr_reg->pr_res_type & 0x0f);
3759 spin_unlock(&dev->dev_reservation_lock);
3760 transport_kunmap_data_sg(cmd);
3766 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3768 * See spc4r17 section 6.13.4 Table 165
3770 static sense_reason_t
3771 core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
3773 struct se_device *dev = cmd->se_dev;
3774 struct t10_reservation *pr_tmpl = &dev->t10_pr;
3776 u16 add_len = 8; /* Hardcoded to 8. */
3778 if (cmd->data_length < 6) {
3779 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
3780 " %u too small\n", cmd->data_length);
3781 return TCM_INVALID_CDB_FIELD;
3784 buf = transport_kmap_data_sg(cmd);
3786 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3788 buf[0] = ((add_len >> 8) & 0xff);
3789 buf[1] = (add_len & 0xff);
3790 buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
3791 buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
3792 buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
3793 buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
3795 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
3796 * set the TMV: Task Mask Valid bit.
3800 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
3802 buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
3804 * PTPL_A: Persistence across Target Power Loss Active bit
3806 if (pr_tmpl->pr_aptpl_active)
3809 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
3811 buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3812 buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
3813 buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
3814 buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
3815 buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
3816 buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3818 transport_kunmap_data_sg(cmd);
3824 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
3826 * See spc4r17 section 6.13.5 Table 168 and 169
3828 static sense_reason_t
3829 core_scsi3_pri_read_full_status(struct se_cmd *cmd)
3831 struct se_device *dev = cmd->se_dev;
3832 struct se_node_acl *se_nacl;
3833 struct se_portal_group *se_tpg;
3834 struct t10_pr_registration *pr_reg, *pr_reg_tmp;
3835 struct t10_reservation *pr_tmpl = &dev->t10_pr;
3837 u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len;
3838 u32 off = 8; /* off into first Full Status descriptor */
3839 int format_code = 0;
3841 if (cmd->data_length < 8) {
3842 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
3843 " too small\n", cmd->data_length);
3844 return TCM_INVALID_CDB_FIELD;
3847 buf = transport_kmap_data_sg(cmd);
3849 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
3851 buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
3852 buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
3853 buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
3854 buf[3] = (dev->t10_pr.pr_generation & 0xff);
3856 spin_lock(&pr_tmpl->registration_lock);
3857 list_for_each_entry_safe(pr_reg, pr_reg_tmp,
3858 &pr_tmpl->registration_list, pr_reg_list) {
3860 se_nacl = pr_reg->pr_reg_nacl;
3861 se_tpg = pr_reg->pr_reg_nacl->se_tpg;
3864 atomic_inc_mb(&pr_reg->pr_res_holders);
3865 spin_unlock(&pr_tmpl->registration_lock);
3867 * Determine expected length of $FABRIC_MOD specific
3868 * TransportID full status descriptor..
3870 exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len(
3871 se_tpg, se_nacl, pr_reg, &format_code);
3873 if ((exp_desc_len + add_len) > cmd->data_length) {
3874 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
3875 " out of buffer: %d\n", cmd->data_length);
3876 spin_lock(&pr_tmpl->registration_lock);
3877 atomic_dec_mb(&pr_reg->pr_res_holders);
3881 * Set RESERVATION KEY
3883 buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
3884 buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
3885 buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
3886 buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
3887 buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
3888 buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
3889 buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
3890 buf[off++] = (pr_reg->pr_res_key & 0xff);
3891 off += 4; /* Skip Over Reserved area */
3894 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
3896 if (pr_reg->pr_reg_all_tg_pt)
3899 * The struct se_lun pointer will be present for the
3900 * reservation holder for PR_HOLDER bit.
3902 * Also, if this registration is the reservation
3903 * holder, fill in SCOPE and TYPE in the next byte.
3905 if (pr_reg->pr_res_holder) {
3907 buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
3908 (pr_reg->pr_res_type & 0x0f);
3912 off += 4; /* Skip over reserved area */
3914 * From spc4r17 6.3.15:
3916 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
3917 * IDENTIFIER field contains the relative port identifier (see
3918 * 3.1.120) of the target port that is part of the I_T nexus
3919 * described by this full status descriptor. If the ALL_TG_PT
3920 * bit is set to one, the contents of the RELATIVE TARGET PORT
3921 * IDENTIFIER field are not defined by this standard.
3923 if (!pr_reg->pr_reg_all_tg_pt) {
3924 struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep;
3926 buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
3927 buf[off++] = (port->sep_rtpi & 0xff);
3929 off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
3932 * Now, have the $FABRIC_MOD fill in the protocol identifier
3934 desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg,
3935 se_nacl, pr_reg, &format_code, &buf[off+4]);
3937 spin_lock(&pr_tmpl->registration_lock);
3938 atomic_dec_mb(&pr_reg->pr_res_holders);
3940 * Set the ADDITIONAL DESCRIPTOR LENGTH
3942 buf[off++] = ((desc_len >> 24) & 0xff);
3943 buf[off++] = ((desc_len >> 16) & 0xff);
3944 buf[off++] = ((desc_len >> 8) & 0xff);
3945 buf[off++] = (desc_len & 0xff);
3947 * Size of full desctipor header minus TransportID
3948 * containing $FABRIC_MOD specific) initiator device/port
3951 * See spc4r17 Section 6.13.5 Table 169
3953 add_desc_len = (24 + desc_len);
3956 add_len += add_desc_len;
3958 spin_unlock(&pr_tmpl->registration_lock);
3960 * Set ADDITIONAL_LENGTH
3962 buf[4] = ((add_len >> 24) & 0xff);
3963 buf[5] = ((add_len >> 16) & 0xff);
3964 buf[6] = ((add_len >> 8) & 0xff);
3965 buf[7] = (add_len & 0xff);
3967 transport_kunmap_data_sg(cmd);
3973 target_scsi3_emulate_pr_in(struct se_cmd *cmd)
3978 * Following spc2r20 5.5.1 Reservations overview:
3980 * If a logical unit has been reserved by any RESERVE command and is
3981 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3982 * PERSISTENT RESERVE OUT commands shall conflict regardless of
3983 * initiator or service action and shall terminate with a RESERVATION
3986 if (cmd->se_dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS) {
3987 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3988 " SPC-2 reservation is held, returning"
3989 " RESERVATION_CONFLICT\n");
3990 return TCM_RESERVATION_CONFLICT;
3993 switch (cmd->t_task_cdb[1] & 0x1f) {
3995 ret = core_scsi3_pri_read_keys(cmd);
3997 case PRI_READ_RESERVATION:
3998 ret = core_scsi3_pri_read_reservation(cmd);
4000 case PRI_REPORT_CAPABILITIES:
4001 ret = core_scsi3_pri_report_capabilities(cmd);
4003 case PRI_READ_FULL_STATUS:
4004 ret = core_scsi3_pri_read_full_status(cmd);
4007 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4008 " action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
4009 return TCM_INVALID_CDB_FIELD;
4013 target_complete_cmd(cmd, GOOD);
4018 target_check_reservation(struct se_cmd *cmd)
4020 struct se_device *dev = cmd->se_dev;
4025 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
4027 if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
4030 spin_lock(&dev->dev_reservation_lock);
4031 if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
4032 ret = target_scsi2_reservation_check(cmd);
4034 ret = target_scsi3_pr_reservation_check(cmd);
4035 spin_unlock(&dev->dev_reservation_lock);