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
,
898 if (!strcmp(pr_reg
->pr_iport
, i_port
) &&
899 (pr_reg
->pr_res_mapped_lun
== deve
->mapped_lun
) &&
900 !(strcmp(pr_reg
->pr_tport
, t_port
)) &&
901 (pr_reg
->pr_reg_tpgt
== tpgt
) &&
902 (pr_reg
->pr_aptpl_target_lun
== target_lun
)) {
904 pr_reg
->pr_reg_nacl
= nacl
;
905 pr_reg
->pr_reg_deve
= deve
;
906 pr_reg
->pr_reg_tg_pt_lun
= lun
;
908 list_del(&pr_reg
->pr_reg_aptpl_list
);
909 spin_unlock(&pr_tmpl
->aptpl_reg_lock
);
911 * At this point all of the pointers in *pr_reg will
912 * be setup, so go ahead and add the registration.
915 __core_scsi3_add_registration(dev
, nacl
, pr_reg
, 0, 0);
917 * If this registration is the reservation holder,
918 * make that happen now..
920 if (pr_reg
->pr_res_holder
)
921 core_scsi3_aptpl_reserve(dev
, tpg
,
924 * Reenable pr_aptpl_active to accept new metadata
925 * updates once the SCSI device is active again..
927 spin_lock(&pr_tmpl
->aptpl_reg_lock
);
928 pr_tmpl
->pr_aptpl_active
= 1;
931 spin_unlock(&pr_tmpl
->aptpl_reg_lock
);
936 int core_scsi3_check_aptpl_registration(
937 struct se_device
*dev
,
938 struct se_portal_group
*tpg
,
940 struct se_node_acl
*nacl
,
943 struct se_dev_entry
*deve
= nacl
->device_list
[mapped_lun
];
945 if (dev
->dev_reservation_flags
& DRF_SPC2_RESERVATIONS
)
948 return __core_scsi3_check_aptpl_registration(dev
, tpg
, lun
,
949 lun
->unpacked_lun
, nacl
, deve
);
952 static void __core_scsi3_dump_registration(
953 struct target_core_fabric_ops
*tfo
,
954 struct se_device
*dev
,
955 struct se_node_acl
*nacl
,
956 struct t10_pr_registration
*pr_reg
,
957 enum register_type register_type
)
959 struct se_portal_group
*se_tpg
= nacl
->se_tpg
;
960 char i_buf
[PR_REG_ISID_ID_LEN
];
962 memset(&i_buf
[0], 0, PR_REG_ISID_ID_LEN
);
963 core_pr_dump_initiator_port(pr_reg
, i_buf
, PR_REG_ISID_ID_LEN
);
965 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
966 " Node: %s%s\n", tfo
->get_fabric_name(), (register_type
== REGISTER_AND_MOVE
) ?
967 "_AND_MOVE" : (register_type
== REGISTER_AND_IGNORE_EXISTING_KEY
) ?
968 "_AND_IGNORE_EXISTING_KEY" : "", nacl
->initiatorname
,
970 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
971 tfo
->get_fabric_name(), tfo
->tpg_get_wwn(se_tpg
),
972 tfo
->tpg_get_tag(se_tpg
));
973 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
974 " Port(s)\n", tfo
->get_fabric_name(),
975 (pr_reg
->pr_reg_all_tg_pt
) ? "ALL" : "SINGLE",
976 dev
->transport
->name
);
977 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
978 " 0x%08x APTPL: %d\n", tfo
->get_fabric_name(),
979 pr_reg
->pr_res_key
, pr_reg
->pr_res_generation
,
980 pr_reg
->pr_reg_aptpl
);
984 * this function can be called with struct se_device->dev_reservation_lock
985 * when register_move = 1
987 static void __core_scsi3_add_registration(
988 struct se_device
*dev
,
989 struct se_node_acl
*nacl
,
990 struct t10_pr_registration
*pr_reg
,
991 enum register_type register_type
,
994 struct target_core_fabric_ops
*tfo
= nacl
->se_tpg
->se_tpg_tfo
;
995 struct t10_pr_registration
*pr_reg_tmp
, *pr_reg_tmp_safe
;
996 struct t10_reservation
*pr_tmpl
= &dev
->t10_pr
;
999 * Increment PRgeneration counter for struct se_device upon a successful
1000 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1002 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1003 * action, the struct se_device->dev_reservation_lock will already be held,
1004 * so we do not call core_scsi3_pr_generation() which grabs the lock
1007 pr_reg
->pr_res_generation
= (register_move
) ?
1008 dev
->t10_pr
.pr_generation
++ :
1009 core_scsi3_pr_generation(dev
);
1011 spin_lock(&pr_tmpl
->registration_lock
);
1012 list_add_tail(&pr_reg
->pr_reg_list
, &pr_tmpl
->registration_list
);
1013 pr_reg
->pr_reg_deve
->def_pr_registered
= 1;
1015 __core_scsi3_dump_registration(tfo
, dev
, nacl
, pr_reg
, register_type
);
1016 spin_unlock(&pr_tmpl
->registration_lock
);
1018 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1020 if (!pr_reg
->pr_reg_all_tg_pt
|| register_move
)
1023 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1024 * allocated in __core_scsi3_alloc_registration()
1026 list_for_each_entry_safe(pr_reg_tmp
, pr_reg_tmp_safe
,
1027 &pr_reg
->pr_reg_atp_list
, pr_reg_atp_mem_list
) {
1028 list_del(&pr_reg_tmp
->pr_reg_atp_mem_list
);
1030 pr_reg_tmp
->pr_res_generation
= core_scsi3_pr_generation(dev
);
1032 spin_lock(&pr_tmpl
->registration_lock
);
1033 list_add_tail(&pr_reg_tmp
->pr_reg_list
,
1034 &pr_tmpl
->registration_list
);
1035 pr_reg_tmp
->pr_reg_deve
->def_pr_registered
= 1;
1037 __core_scsi3_dump_registration(tfo
, dev
,
1038 pr_reg_tmp
->pr_reg_nacl
, pr_reg_tmp
,
1040 spin_unlock(&pr_tmpl
->registration_lock
);
1042 * Drop configfs group dependency reference from
1043 * __core_scsi3_alloc_registration()
1045 core_scsi3_lunacl_undepend_item(pr_reg_tmp
->pr_reg_deve
);
1049 static int core_scsi3_alloc_registration(
1050 struct se_device
*dev
,
1051 struct se_node_acl
*nacl
,
1052 struct se_dev_entry
*deve
,
1053 unsigned char *isid
,
1057 enum register_type register_type
,
1060 struct t10_pr_registration
*pr_reg
;
1062 pr_reg
= __core_scsi3_alloc_registration(dev
, nacl
, deve
, isid
,
1063 sa_res_key
, all_tg_pt
, aptpl
);
1067 __core_scsi3_add_registration(dev
, nacl
, pr_reg
,
1068 register_type
, register_move
);
1072 static struct t10_pr_registration
*__core_scsi3_locate_pr_reg(
1073 struct se_device
*dev
,
1074 struct se_node_acl
*nacl
,
1075 unsigned char *isid
)
1077 struct t10_reservation
*pr_tmpl
= &dev
->t10_pr
;
1078 struct t10_pr_registration
*pr_reg
, *pr_reg_tmp
;
1079 struct se_portal_group
*tpg
;
1081 spin_lock(&pr_tmpl
->registration_lock
);
1082 list_for_each_entry_safe(pr_reg
, pr_reg_tmp
,
1083 &pr_tmpl
->registration_list
, pr_reg_list
) {
1085 * First look for a matching struct se_node_acl
1087 if (pr_reg
->pr_reg_nacl
!= nacl
)
1090 tpg
= pr_reg
->pr_reg_nacl
->se_tpg
;
1092 * If this registration does NOT contain a fabric provided
1093 * ISID, then we have found a match.
1095 if (!pr_reg
->isid_present_at_reg
) {
1097 * Determine if this SCSI device server requires that
1098 * SCSI Intiatior TransportID w/ ISIDs is enforced
1099 * for fabric modules (iSCSI) requiring them.
1101 if (tpg
->se_tpg_tfo
->sess_get_initiator_sid
!= NULL
) {
1102 if (dev
->dev_attrib
.enforce_pr_isids
)
1105 atomic_inc_mb(&pr_reg
->pr_res_holders
);
1106 spin_unlock(&pr_tmpl
->registration_lock
);
1110 * If the *pr_reg contains a fabric defined ISID for multi-value
1111 * SCSI Initiator Port TransportIDs, then we expect a valid
1112 * matching ISID to be provided by the local SCSI Initiator Port.
1116 if (strcmp(isid
, pr_reg
->pr_reg_isid
))
1119 atomic_inc_mb(&pr_reg
->pr_res_holders
);
1120 spin_unlock(&pr_tmpl
->registration_lock
);
1123 spin_unlock(&pr_tmpl
->registration_lock
);
1128 static struct t10_pr_registration
*core_scsi3_locate_pr_reg(
1129 struct se_device
*dev
,
1130 struct se_node_acl
*nacl
,
1131 struct se_session
*sess
)
1133 struct se_portal_group
*tpg
= nacl
->se_tpg
;
1134 unsigned char buf
[PR_REG_ISID_LEN
], *isid_ptr
= NULL
;
1136 if (tpg
->se_tpg_tfo
->sess_get_initiator_sid
!= NULL
) {
1137 memset(&buf
[0], 0, PR_REG_ISID_LEN
);
1138 tpg
->se_tpg_tfo
->sess_get_initiator_sid(sess
, &buf
[0],
1143 return __core_scsi3_locate_pr_reg(dev
, nacl
, isid_ptr
);
1146 static void core_scsi3_put_pr_reg(struct t10_pr_registration
*pr_reg
)
1148 atomic_dec_mb(&pr_reg
->pr_res_holders
);
1151 static int core_scsi3_check_implicit_release(
1152 struct se_device
*dev
,
1153 struct t10_pr_registration
*pr_reg
)
1155 struct se_node_acl
*nacl
= pr_reg
->pr_reg_nacl
;
1156 struct t10_pr_registration
*pr_res_holder
;
1159 spin_lock(&dev
->dev_reservation_lock
);
1160 pr_res_holder
= dev
->dev_pr_res_holder
;
1161 if (!pr_res_holder
) {
1162 spin_unlock(&dev
->dev_reservation_lock
);
1165 if (pr_res_holder
== pr_reg
) {
1167 * Perform an implicit RELEASE if the registration that
1168 * is being released is holding the reservation.
1170 * From spc4r17, section 5.7.11.1:
1172 * e) If the I_T nexus is the persistent reservation holder
1173 * and the persistent reservation is not an all registrants
1174 * type, then a PERSISTENT RESERVE OUT command with REGISTER
1175 * service action or REGISTER AND IGNORE EXISTING KEY
1176 * service action with the SERVICE ACTION RESERVATION KEY
1177 * field set to zero (see 5.7.11.3).
1179 __core_scsi3_complete_pro_release(dev
, nacl
, pr_reg
, 0);
1182 * For 'All Registrants' reservation types, all existing
1183 * registrations are still processed as reservation holders
1184 * in core_scsi3_pr_seq_non_holder() after the initial
1185 * reservation holder is implicitly released here.
1187 } else if (pr_reg
->pr_reg_all_tg_pt
&&
1188 (!strcmp(pr_res_holder
->pr_reg_nacl
->initiatorname
,
1189 pr_reg
->pr_reg_nacl
->initiatorname
)) &&
1190 (pr_res_holder
->pr_res_key
== pr_reg
->pr_res_key
)) {
1191 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
1192 " UNREGISTER while existing reservation with matching"
1193 " key 0x%016Lx is present from another SCSI Initiator"
1194 " Port\n", pr_reg
->pr_res_key
);
1197 spin_unlock(&dev
->dev_reservation_lock
);
1203 * Called with struct t10_reservation->registration_lock held.
1205 static void __core_scsi3_free_registration(
1206 struct se_device
*dev
,
1207 struct t10_pr_registration
*pr_reg
,
1208 struct list_head
*preempt_and_abort_list
,
1211 struct target_core_fabric_ops
*tfo
=
1212 pr_reg
->pr_reg_nacl
->se_tpg
->se_tpg_tfo
;
1213 struct t10_reservation
*pr_tmpl
= &dev
->t10_pr
;
1214 char i_buf
[PR_REG_ISID_ID_LEN
];
1216 memset(i_buf
, 0, PR_REG_ISID_ID_LEN
);
1217 core_pr_dump_initiator_port(pr_reg
, i_buf
, PR_REG_ISID_ID_LEN
);
1219 pr_reg
->pr_reg_deve
->def_pr_registered
= 0;
1220 pr_reg
->pr_reg_deve
->pr_res_key
= 0;
1221 list_del(&pr_reg
->pr_reg_list
);
1223 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1224 * so call core_scsi3_put_pr_reg() to decrement our reference.
1227 core_scsi3_put_pr_reg(pr_reg
);
1229 * Wait until all reference from any other I_T nexuses for this
1230 * *pr_reg have been released. Because list_del() is called above,
1231 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1232 * count back to zero, and we release *pr_reg.
1234 while (atomic_read(&pr_reg
->pr_res_holders
) != 0) {
1235 spin_unlock(&pr_tmpl
->registration_lock
);
1236 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
1237 tfo
->get_fabric_name());
1239 spin_lock(&pr_tmpl
->registration_lock
);
1242 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
1243 " Node: %s%s\n", tfo
->get_fabric_name(),
1244 pr_reg
->pr_reg_nacl
->initiatorname
,
1246 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1247 " Port(s)\n", tfo
->get_fabric_name(),
1248 (pr_reg
->pr_reg_all_tg_pt
) ? "ALL" : "SINGLE",
1249 dev
->transport
->name
);
1250 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1251 " 0x%08x\n", tfo
->get_fabric_name(), pr_reg
->pr_res_key
,
1252 pr_reg
->pr_res_generation
);
1254 if (!preempt_and_abort_list
) {
1255 pr_reg
->pr_reg_deve
= NULL
;
1256 pr_reg
->pr_reg_nacl
= NULL
;
1257 kmem_cache_free(t10_pr_reg_cache
, pr_reg
);
1261 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1262 * are released once the ABORT_TASK_SET has completed..
1264 list_add_tail(&pr_reg
->pr_reg_abort_list
, preempt_and_abort_list
);
1267 void core_scsi3_free_pr_reg_from_nacl(
1268 struct se_device
*dev
,
1269 struct se_node_acl
*nacl
)
1271 struct t10_reservation
*pr_tmpl
= &dev
->t10_pr
;
1272 struct t10_pr_registration
*pr_reg
, *pr_reg_tmp
, *pr_res_holder
;
1274 * If the passed se_node_acl matches the reservation holder,
1275 * release the reservation.
1277 spin_lock(&dev
->dev_reservation_lock
);
1278 pr_res_holder
= dev
->dev_pr_res_holder
;
1279 if ((pr_res_holder
!= NULL
) &&
1280 (pr_res_holder
->pr_reg_nacl
== nacl
))
1281 __core_scsi3_complete_pro_release(dev
, nacl
, pr_res_holder
, 0);
1282 spin_unlock(&dev
->dev_reservation_lock
);
1284 * Release any registration associated with the struct se_node_acl.
1286 spin_lock(&pr_tmpl
->registration_lock
);
1287 list_for_each_entry_safe(pr_reg
, pr_reg_tmp
,
1288 &pr_tmpl
->registration_list
, pr_reg_list
) {
1290 if (pr_reg
->pr_reg_nacl
!= nacl
)
1293 __core_scsi3_free_registration(dev
, pr_reg
, NULL
, 0);
1295 spin_unlock(&pr_tmpl
->registration_lock
);
1298 void core_scsi3_free_all_registrations(
1299 struct se_device
*dev
)
1301 struct t10_reservation
*pr_tmpl
= &dev
->t10_pr
;
1302 struct t10_pr_registration
*pr_reg
, *pr_reg_tmp
, *pr_res_holder
;
1304 spin_lock(&dev
->dev_reservation_lock
);
1305 pr_res_holder
= dev
->dev_pr_res_holder
;
1306 if (pr_res_holder
!= NULL
) {
1307 struct se_node_acl
*pr_res_nacl
= pr_res_holder
->pr_reg_nacl
;
1308 __core_scsi3_complete_pro_release(dev
, pr_res_nacl
,
1311 spin_unlock(&dev
->dev_reservation_lock
);
1313 spin_lock(&pr_tmpl
->registration_lock
);
1314 list_for_each_entry_safe(pr_reg
, pr_reg_tmp
,
1315 &pr_tmpl
->registration_list
, pr_reg_list
) {
1317 __core_scsi3_free_registration(dev
, pr_reg
, NULL
, 0);
1319 spin_unlock(&pr_tmpl
->registration_lock
);
1321 spin_lock(&pr_tmpl
->aptpl_reg_lock
);
1322 list_for_each_entry_safe(pr_reg
, pr_reg_tmp
, &pr_tmpl
->aptpl_reg_list
,
1323 pr_reg_aptpl_list
) {
1324 list_del(&pr_reg
->pr_reg_aptpl_list
);
1325 kmem_cache_free(t10_pr_reg_cache
, pr_reg
);
1327 spin_unlock(&pr_tmpl
->aptpl_reg_lock
);
1330 static int core_scsi3_tpg_depend_item(struct se_portal_group
*tpg
)
1332 return configfs_depend_item(tpg
->se_tpg_tfo
->tf_subsys
,
1333 &tpg
->tpg_group
.cg_item
);
1336 static void core_scsi3_tpg_undepend_item(struct se_portal_group
*tpg
)
1338 configfs_undepend_item(tpg
->se_tpg_tfo
->tf_subsys
,
1339 &tpg
->tpg_group
.cg_item
);
1341 atomic_dec_mb(&tpg
->tpg_pr_ref_count
);
1344 static int core_scsi3_nodeacl_depend_item(struct se_node_acl
*nacl
)
1346 struct se_portal_group
*tpg
= nacl
->se_tpg
;
1348 if (nacl
->dynamic_node_acl
)
1351 return configfs_depend_item(tpg
->se_tpg_tfo
->tf_subsys
,
1352 &nacl
->acl_group
.cg_item
);
1355 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl
*nacl
)
1357 struct se_portal_group
*tpg
= nacl
->se_tpg
;
1359 if (nacl
->dynamic_node_acl
) {
1360 atomic_dec_mb(&nacl
->acl_pr_ref_count
);
1364 configfs_undepend_item(tpg
->se_tpg_tfo
->tf_subsys
,
1365 &nacl
->acl_group
.cg_item
);
1367 atomic_dec_mb(&nacl
->acl_pr_ref_count
);
1370 static int core_scsi3_lunacl_depend_item(struct se_dev_entry
*se_deve
)
1372 struct se_lun_acl
*lun_acl
= se_deve
->se_lun_acl
;
1373 struct se_node_acl
*nacl
;
1374 struct se_portal_group
*tpg
;
1376 * For nacl->dynamic_node_acl=1
1381 nacl
= lun_acl
->se_lun_nacl
;
1384 return configfs_depend_item(tpg
->se_tpg_tfo
->tf_subsys
,
1385 &lun_acl
->se_lun_group
.cg_item
);
1388 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry
*se_deve
)
1390 struct se_lun_acl
*lun_acl
= se_deve
->se_lun_acl
;
1391 struct se_node_acl
*nacl
;
1392 struct se_portal_group
*tpg
;
1394 * For nacl->dynamic_node_acl=1
1397 atomic_dec_mb(&se_deve
->pr_ref_count
);
1400 nacl
= lun_acl
->se_lun_nacl
;
1403 configfs_undepend_item(tpg
->se_tpg_tfo
->tf_subsys
,
1404 &lun_acl
->se_lun_group
.cg_item
);
1406 atomic_dec_mb(&se_deve
->pr_ref_count
);
1409 static sense_reason_t
1410 core_scsi3_decode_spec_i_port(
1412 struct se_portal_group
*tpg
,
1413 unsigned char *l_isid
,
1418 struct se_device
*dev
= cmd
->se_dev
;
1419 struct se_port
*tmp_port
;
1420 struct se_portal_group
*dest_tpg
= NULL
, *tmp_tpg
;
1421 struct se_session
*se_sess
= cmd
->se_sess
;
1422 struct se_node_acl
*dest_node_acl
= NULL
;
1423 struct se_dev_entry
*dest_se_deve
= NULL
, *local_se_deve
;
1424 struct t10_pr_registration
*dest_pr_reg
, *local_pr_reg
, *pr_reg_e
;
1425 struct t10_pr_registration
*pr_reg_tmp
, *pr_reg_tmp_safe
;
1426 LIST_HEAD(tid_dest_list
);
1427 struct pr_transport_id_holder
*tidh_new
, *tidh
, *tidh_tmp
;
1428 struct target_core_fabric_ops
*tmp_tf_ops
;
1430 unsigned char *ptr
, *i_str
= NULL
, proto_ident
, tmp_proto_ident
;
1431 char *iport_ptr
= NULL
, dest_iport
[64], i_buf
[PR_REG_ISID_ID_LEN
];
1433 u32 tpdl
, tid_len
= 0;
1434 int dest_local_nexus
;
1437 memset(dest_iport
, 0, 64);
1439 local_se_deve
= se_sess
->se_node_acl
->device_list
[cmd
->orig_fe_lun
];
1441 * Allocate a struct pr_transport_id_holder and setup the
1442 * local_node_acl and local_se_deve pointers and add to
1443 * struct list_head tid_dest_list for add registration
1444 * processing in the loop of tid_dest_list below.
1446 tidh_new
= kzalloc(sizeof(struct pr_transport_id_holder
), GFP_KERNEL
);
1448 pr_err("Unable to allocate tidh_new\n");
1449 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1451 INIT_LIST_HEAD(&tidh_new
->dest_list
);
1452 tidh_new
->dest_tpg
= tpg
;
1453 tidh_new
->dest_node_acl
= se_sess
->se_node_acl
;
1454 tidh_new
->dest_se_deve
= local_se_deve
;
1456 local_pr_reg
= __core_scsi3_alloc_registration(cmd
->se_dev
,
1457 se_sess
->se_node_acl
, local_se_deve
, l_isid
,
1458 sa_res_key
, all_tg_pt
, aptpl
);
1459 if (!local_pr_reg
) {
1461 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1463 tidh_new
->dest_pr_reg
= local_pr_reg
;
1465 * The local I_T nexus does not hold any configfs dependances,
1466 * so we set tid_h->dest_local_nexus=1 to prevent the
1467 * configfs_undepend_item() calls in the tid_dest_list loops below.
1469 tidh_new
->dest_local_nexus
= 1;
1470 list_add_tail(&tidh_new
->dest_list
, &tid_dest_list
);
1472 if (cmd
->data_length
< 28) {
1473 pr_warn("SPC-PR: Received PR OUT parameter list"
1474 " length too small: %u\n", cmd
->data_length
);
1475 ret
= TCM_INVALID_PARAMETER_LIST
;
1479 buf
= transport_kmap_data_sg(cmd
);
1481 ret
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1486 * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1487 * first extract TransportID Parameter Data Length, and make sure
1488 * the value matches up to the SCSI expected data transfer length.
1490 tpdl
= (buf
[24] & 0xff) << 24;
1491 tpdl
|= (buf
[25] & 0xff) << 16;
1492 tpdl
|= (buf
[26] & 0xff) << 8;
1493 tpdl
|= buf
[27] & 0xff;
1495 if ((tpdl
+ 28) != cmd
->data_length
) {
1496 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
1497 " does not equal CDB data_length: %u\n", tpdl
,
1499 ret
= TCM_INVALID_PARAMETER_LIST
;
1503 * Start processing the received transport IDs using the
1504 * receiving I_T Nexus portal's fabric dependent methods to
1505 * obtain the SCSI Initiator Port/Device Identifiers.
1510 proto_ident
= (ptr
[0] & 0x0f);
1513 spin_lock(&dev
->se_port_lock
);
1514 list_for_each_entry(tmp_port
, &dev
->dev_sep_list
, sep_list
) {
1515 tmp_tpg
= tmp_port
->sep_tpg
;
1518 tmp_tf_ops
= tmp_tpg
->se_tpg_tfo
;
1521 if (!tmp_tf_ops
->get_fabric_proto_ident
||
1522 !tmp_tf_ops
->tpg_parse_pr_out_transport_id
)
1525 * Look for the matching proto_ident provided by
1526 * the received TransportID
1528 tmp_proto_ident
= tmp_tf_ops
->get_fabric_proto_ident(tmp_tpg
);
1529 if (tmp_proto_ident
!= proto_ident
)
1531 dest_rtpi
= tmp_port
->sep_rtpi
;
1533 i_str
= tmp_tf_ops
->tpg_parse_pr_out_transport_id(
1534 tmp_tpg
, (const char *)ptr
, &tid_len
,
1539 atomic_inc_mb(&tmp_tpg
->tpg_pr_ref_count
);
1540 spin_unlock(&dev
->se_port_lock
);
1542 if (core_scsi3_tpg_depend_item(tmp_tpg
)) {
1543 pr_err(" core_scsi3_tpg_depend_item()"
1545 atomic_dec_mb(&tmp_tpg
->tpg_pr_ref_count
);
1546 ret
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1550 * Locate the destination initiator ACL to be registered
1551 * from the decoded fabric module specific TransportID
1554 spin_lock_irq(&tmp_tpg
->acl_node_lock
);
1555 dest_node_acl
= __core_tpg_get_initiator_node_acl(
1558 atomic_inc_mb(&dest_node_acl
->acl_pr_ref_count
);
1559 spin_unlock_irq(&tmp_tpg
->acl_node_lock
);
1561 if (!dest_node_acl
) {
1562 core_scsi3_tpg_undepend_item(tmp_tpg
);
1563 spin_lock(&dev
->se_port_lock
);
1567 if (core_scsi3_nodeacl_depend_item(dest_node_acl
)) {
1568 pr_err("configfs_depend_item() failed"
1569 " for dest_node_acl->acl_group\n");
1570 atomic_dec_mb(&dest_node_acl
->acl_pr_ref_count
);
1571 core_scsi3_tpg_undepend_item(tmp_tpg
);
1572 ret
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1577 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
1578 " %s Port RTPI: %hu\n",
1579 dest_tpg
->se_tpg_tfo
->get_fabric_name(),
1580 dest_node_acl
->initiatorname
, dest_rtpi
);
1582 spin_lock(&dev
->se_port_lock
);
1585 spin_unlock(&dev
->se_port_lock
);
1588 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
1590 ret
= TCM_INVALID_PARAMETER_LIST
;
1594 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
1595 " tid_len: %d for %s + %s\n",
1596 dest_tpg
->se_tpg_tfo
->get_fabric_name(), cmd
->data_length
,
1597 tpdl
, tid_len
, i_str
, iport_ptr
);
1599 if (tid_len
> tpdl
) {
1600 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
1601 " %u for Transport ID: %s\n", tid_len
, ptr
);
1602 core_scsi3_nodeacl_undepend_item(dest_node_acl
);
1603 core_scsi3_tpg_undepend_item(dest_tpg
);
1604 ret
= TCM_INVALID_PARAMETER_LIST
;
1608 * Locate the desintation struct se_dev_entry pointer for matching
1609 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1612 dest_se_deve
= core_get_se_deve_from_rtpi(dest_node_acl
,
1614 if (!dest_se_deve
) {
1615 pr_err("Unable to locate %s dest_se_deve"
1616 " from destination RTPI: %hu\n",
1617 dest_tpg
->se_tpg_tfo
->get_fabric_name(),
1620 core_scsi3_nodeacl_undepend_item(dest_node_acl
);
1621 core_scsi3_tpg_undepend_item(dest_tpg
);
1622 ret
= TCM_INVALID_PARAMETER_LIST
;
1626 if (core_scsi3_lunacl_depend_item(dest_se_deve
)) {
1627 pr_err("core_scsi3_lunacl_depend_item()"
1629 atomic_dec_mb(&dest_se_deve
->pr_ref_count
);
1630 core_scsi3_nodeacl_undepend_item(dest_node_acl
);
1631 core_scsi3_tpg_undepend_item(dest_tpg
);
1632 ret
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1636 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
1637 " dest_se_deve mapped_lun: %u\n",
1638 dest_tpg
->se_tpg_tfo
->get_fabric_name(),
1639 dest_node_acl
->initiatorname
, dest_se_deve
->mapped_lun
);
1642 * Skip any TransportIDs that already have a registration for
1645 pr_reg_e
= __core_scsi3_locate_pr_reg(dev
, dest_node_acl
,
1648 core_scsi3_put_pr_reg(pr_reg_e
);
1649 core_scsi3_lunacl_undepend_item(dest_se_deve
);
1650 core_scsi3_nodeacl_undepend_item(dest_node_acl
);
1651 core_scsi3_tpg_undepend_item(dest_tpg
);
1658 * Allocate a struct pr_transport_id_holder and setup
1659 * the dest_node_acl and dest_se_deve pointers for the
1662 tidh_new
= kzalloc(sizeof(struct pr_transport_id_holder
),
1665 pr_err("Unable to allocate tidh_new\n");
1666 core_scsi3_lunacl_undepend_item(dest_se_deve
);
1667 core_scsi3_nodeacl_undepend_item(dest_node_acl
);
1668 core_scsi3_tpg_undepend_item(dest_tpg
);
1669 ret
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1672 INIT_LIST_HEAD(&tidh_new
->dest_list
);
1673 tidh_new
->dest_tpg
= dest_tpg
;
1674 tidh_new
->dest_node_acl
= dest_node_acl
;
1675 tidh_new
->dest_se_deve
= dest_se_deve
;
1678 * Allocate, but do NOT add the registration for the
1679 * TransportID referenced SCSI Initiator port. This
1680 * done because of the following from spc4r17 in section
1681 * 6.14.3 wrt SPEC_I_PT:
1683 * "If a registration fails for any initiator port (e.g., if th
1684 * logical unit does not have enough resources available to
1685 * hold the registration information), no registrations shall be
1686 * made, and the command shall be terminated with
1687 * CHECK CONDITION status."
1689 * That means we call __core_scsi3_alloc_registration() here,
1690 * and then call __core_scsi3_add_registration() in the
1691 * 2nd loop which will never fail.
1693 dest_pr_reg
= __core_scsi3_alloc_registration(cmd
->se_dev
,
1694 dest_node_acl
, dest_se_deve
, iport_ptr
,
1695 sa_res_key
, all_tg_pt
, aptpl
);
1697 core_scsi3_lunacl_undepend_item(dest_se_deve
);
1698 core_scsi3_nodeacl_undepend_item(dest_node_acl
);
1699 core_scsi3_tpg_undepend_item(dest_tpg
);
1701 ret
= TCM_INVALID_PARAMETER_LIST
;
1704 tidh_new
->dest_pr_reg
= dest_pr_reg
;
1705 list_add_tail(&tidh_new
->dest_list
, &tid_dest_list
);
1713 transport_kunmap_data_sg(cmd
);
1716 * Go ahead and create a registrations from tid_dest_list for the
1717 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1720 * The SA Reservation Key from the PROUT is set for the
1721 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1
1722 * means that the TransportID Initiator port will be
1723 * registered on all of the target ports in the SCSI target device
1724 * ALL_TG_PT=0 means the registration will only be for the
1725 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1728 list_for_each_entry_safe(tidh
, tidh_tmp
, &tid_dest_list
, dest_list
) {
1729 dest_tpg
= tidh
->dest_tpg
;
1730 dest_node_acl
= tidh
->dest_node_acl
;
1731 dest_se_deve
= tidh
->dest_se_deve
;
1732 dest_pr_reg
= tidh
->dest_pr_reg
;
1733 dest_local_nexus
= tidh
->dest_local_nexus
;
1735 list_del(&tidh
->dest_list
);
1738 memset(i_buf
, 0, PR_REG_ISID_ID_LEN
);
1739 core_pr_dump_initiator_port(dest_pr_reg
, i_buf
, PR_REG_ISID_ID_LEN
);
1741 __core_scsi3_add_registration(cmd
->se_dev
, dest_node_acl
,
1744 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
1745 " registered Transport ID for Node: %s%s Mapped LUN:"
1746 " %u\n", dest_tpg
->se_tpg_tfo
->get_fabric_name(),
1747 dest_node_acl
->initiatorname
, i_buf
, dest_se_deve
->mapped_lun
);
1749 if (dest_local_nexus
)
1752 core_scsi3_lunacl_undepend_item(dest_se_deve
);
1753 core_scsi3_nodeacl_undepend_item(dest_node_acl
);
1754 core_scsi3_tpg_undepend_item(dest_tpg
);
1759 transport_kunmap_data_sg(cmd
);
1762 * For the failure case, release everything from tid_dest_list
1763 * including *dest_pr_reg and the configfs dependances..
1765 list_for_each_entry_safe(tidh
, tidh_tmp
, &tid_dest_list
, dest_list
) {
1766 dest_tpg
= tidh
->dest_tpg
;
1767 dest_node_acl
= tidh
->dest_node_acl
;
1768 dest_se_deve
= tidh
->dest_se_deve
;
1769 dest_pr_reg
= tidh
->dest_pr_reg
;
1770 dest_local_nexus
= tidh
->dest_local_nexus
;
1772 list_del(&tidh
->dest_list
);
1775 * Release any extra ALL_TG_PT=1 registrations for
1776 * the SPEC_I_PT=1 case.
1778 list_for_each_entry_safe(pr_reg_tmp
, pr_reg_tmp_safe
,
1779 &dest_pr_reg
->pr_reg_atp_list
,
1780 pr_reg_atp_mem_list
) {
1781 list_del(&pr_reg_tmp
->pr_reg_atp_mem_list
);
1782 core_scsi3_lunacl_undepend_item(pr_reg_tmp
->pr_reg_deve
);
1783 kmem_cache_free(t10_pr_reg_cache
, pr_reg_tmp
);
1786 kmem_cache_free(t10_pr_reg_cache
, dest_pr_reg
);
1788 if (dest_local_nexus
)
1791 core_scsi3_lunacl_undepend_item(dest_se_deve
);
1792 core_scsi3_nodeacl_undepend_item(dest_node_acl
);
1793 core_scsi3_tpg_undepend_item(dest_tpg
);
1798 static int core_scsi3_update_aptpl_buf(
1799 struct se_device
*dev
,
1801 u32 pr_aptpl_buf_len
)
1804 struct se_portal_group
*tpg
;
1805 struct t10_pr_registration
*pr_reg
;
1806 unsigned char tmp
[512], isid_buf
[32];
1811 spin_lock(&dev
->dev_reservation_lock
);
1812 spin_lock(&dev
->t10_pr
.registration_lock
);
1814 * Walk the registration list..
1816 list_for_each_entry(pr_reg
, &dev
->t10_pr
.registration_list
,
1821 tpg
= pr_reg
->pr_reg_nacl
->se_tpg
;
1822 lun
= pr_reg
->pr_reg_tg_pt_lun
;
1824 * Write out any ISID value to APTPL metadata that was included
1825 * in the original registration.
1827 if (pr_reg
->isid_present_at_reg
)
1828 snprintf(isid_buf
, 32, "initiator_sid=%s\n",
1829 pr_reg
->pr_reg_isid
);
1831 * Include special metadata if the pr_reg matches the
1832 * reservation holder.
1834 if (dev
->dev_pr_res_holder
== pr_reg
) {
1835 snprintf(tmp
, 512, "PR_REG_START: %d"
1836 "\ninitiator_fabric=%s\n"
1837 "initiator_node=%s\n%s"
1839 "res_holder=1\nres_type=%02x\n"
1840 "res_scope=%02x\nres_all_tg_pt=%d\n"
1841 "mapped_lun=%u\n", reg_count
,
1842 tpg
->se_tpg_tfo
->get_fabric_name(),
1843 pr_reg
->pr_reg_nacl
->initiatorname
, isid_buf
,
1844 pr_reg
->pr_res_key
, pr_reg
->pr_res_type
,
1845 pr_reg
->pr_res_scope
, pr_reg
->pr_reg_all_tg_pt
,
1846 pr_reg
->pr_res_mapped_lun
);
1848 snprintf(tmp
, 512, "PR_REG_START: %d\n"
1849 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1850 "sa_res_key=%llu\nres_holder=0\n"
1851 "res_all_tg_pt=%d\nmapped_lun=%u\n",
1852 reg_count
, tpg
->se_tpg_tfo
->get_fabric_name(),
1853 pr_reg
->pr_reg_nacl
->initiatorname
, isid_buf
,
1854 pr_reg
->pr_res_key
, pr_reg
->pr_reg_all_tg_pt
,
1855 pr_reg
->pr_res_mapped_lun
);
1858 if ((len
+ strlen(tmp
) >= pr_aptpl_buf_len
)) {
1859 pr_err("Unable to update renaming"
1860 " APTPL metadata\n");
1864 len
+= sprintf(buf
+len
, "%s", tmp
);
1867 * Include information about the associated SCSI target port.
1869 snprintf(tmp
, 512, "target_fabric=%s\ntarget_node=%s\n"
1870 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
1871 " %d\n", tpg
->se_tpg_tfo
->get_fabric_name(),
1872 tpg
->se_tpg_tfo
->tpg_get_wwn(tpg
),
1873 tpg
->se_tpg_tfo
->tpg_get_tag(tpg
),
1874 lun
->lun_sep
->sep_rtpi
, lun
->unpacked_lun
, reg_count
);
1876 if ((len
+ strlen(tmp
) >= pr_aptpl_buf_len
)) {
1877 pr_err("Unable to update renaming"
1878 " APTPL metadata\n");
1882 len
+= sprintf(buf
+len
, "%s", tmp
);
1887 len
+= sprintf(buf
+len
, "No Registrations or Reservations");
1890 spin_unlock(&dev
->t10_pr
.registration_lock
);
1891 spin_unlock(&dev
->dev_reservation_lock
);
1896 static int __core_scsi3_write_aptpl_to_file(
1897 struct se_device
*dev
,
1900 struct t10_wwn
*wwn
= &dev
->t10_wwn
;
1902 int flags
= O_RDWR
| O_CREAT
| O_TRUNC
;
1904 u32 pr_aptpl_buf_len
;
1907 memset(path
, 0, 512);
1909 if (strlen(&wwn
->unit_serial
[0]) >= 512) {
1910 pr_err("WWN value for struct se_device does not fit"
1911 " into path buffer\n");
1915 snprintf(path
, 512, "/var/target/pr/aptpl_%s", &wwn
->unit_serial
[0]);
1916 file
= filp_open(path
, flags
, 0600);
1918 pr_err("filp_open(%s) for APTPL metadata"
1920 return PTR_ERR(file
);
1923 pr_aptpl_buf_len
= (strlen(buf
) + 1); /* Add extra for NULL */
1925 ret
= kernel_write(file
, buf
, pr_aptpl_buf_len
, 0);
1928 pr_debug("Error writing APTPL metadata file: %s\n", path
);
1931 return (ret
< 0) ? -EIO
: 0;
1935 * Clear the APTPL metadata if APTPL has been disabled, otherwise
1936 * write out the updated metadata to struct file for this SCSI device.
1938 static sense_reason_t
core_scsi3_update_and_write_aptpl(struct se_device
*dev
, bool aptpl
)
1944 char *null_buf
= "No Registrations or Reservations\n";
1946 rc
= __core_scsi3_write_aptpl_to_file(dev
, null_buf
);
1947 dev
->t10_pr
.pr_aptpl_active
= 0;
1948 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n");
1951 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1956 buf
= kzalloc(PR_APTPL_BUF_LEN
, GFP_KERNEL
);
1958 return TCM_OUT_OF_RESOURCES
;
1960 rc
= core_scsi3_update_aptpl_buf(dev
, buf
, PR_APTPL_BUF_LEN
);
1963 return TCM_OUT_OF_RESOURCES
;
1966 rc
= __core_scsi3_write_aptpl_to_file(dev
, buf
);
1968 pr_err("SPC-3 PR: Could not update APTPL\n");
1970 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1972 dev
->t10_pr
.pr_aptpl_active
= 1;
1974 pr_debug("SPC-3 PR: Set APTPL Bit Activated\n");
1978 static sense_reason_t
1979 core_scsi3_emulate_pro_register(struct se_cmd
*cmd
, u64 res_key
, u64 sa_res_key
,
1980 bool aptpl
, bool all_tg_pt
, bool spec_i_pt
, enum register_type register_type
)
1982 struct se_session
*se_sess
= cmd
->se_sess
;
1983 struct se_device
*dev
= cmd
->se_dev
;
1984 struct se_dev_entry
*se_deve
;
1985 struct se_lun
*se_lun
= cmd
->se_lun
;
1986 struct se_portal_group
*se_tpg
;
1987 struct t10_pr_registration
*pr_reg
, *pr_reg_p
, *pr_reg_tmp
;
1988 struct t10_reservation
*pr_tmpl
= &dev
->t10_pr
;
1989 unsigned char isid_buf
[PR_REG_ISID_LEN
], *isid_ptr
= NULL
;
1990 sense_reason_t ret
= TCM_NO_SENSE
;
1991 int pr_holder
= 0, type
;
1993 if (!se_sess
|| !se_lun
) {
1994 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
1995 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1997 se_tpg
= se_sess
->se_tpg
;
1998 se_deve
= se_sess
->se_node_acl
->device_list
[cmd
->orig_fe_lun
];
2000 if (se_tpg
->se_tpg_tfo
->sess_get_initiator_sid
) {
2001 memset(&isid_buf
[0], 0, PR_REG_ISID_LEN
);
2002 se_tpg
->se_tpg_tfo
->sess_get_initiator_sid(se_sess
, &isid_buf
[0],
2004 isid_ptr
= &isid_buf
[0];
2007 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2009 pr_reg
= core_scsi3_locate_pr_reg(dev
, se_sess
->se_node_acl
, se_sess
);
2012 pr_warn("SPC-3 PR: Reservation Key non-zero"
2013 " for SA REGISTER, returning CONFLICT\n");
2014 return TCM_RESERVATION_CONFLICT
;
2017 * Do nothing but return GOOD status.
2024 * Perform the Service Action REGISTER on the Initiator
2025 * Port Endpoint that the PRO was received from on the
2026 * Logical Unit of the SCSI device server.
2028 if (core_scsi3_alloc_registration(cmd
->se_dev
,
2029 se_sess
->se_node_acl
, se_deve
, isid_ptr
,
2030 sa_res_key
, all_tg_pt
, aptpl
,
2031 register_type
, 0)) {
2032 pr_err("Unable to allocate"
2033 " struct t10_pr_registration\n");
2034 return TCM_INVALID_PARAMETER_LIST
;
2038 * Register both the Initiator port that received
2039 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2040 * TransportID from Parameter list and loop through
2041 * fabric dependent parameter list while calling
2042 * logic from of core_scsi3_alloc_registration() for
2043 * each TransportID provided SCSI Initiator Port/Device
2045 ret
= core_scsi3_decode_spec_i_port(cmd
, se_tpg
,
2046 isid_ptr
, sa_res_key
, all_tg_pt
, aptpl
);
2051 return core_scsi3_update_and_write_aptpl(dev
, aptpl
);
2054 /* ok, existing registration */
2056 if ((register_type
== REGISTER
) && (res_key
!= pr_reg
->pr_res_key
)) {
2057 pr_err("SPC-3 PR REGISTER: Received"
2058 " res_key: 0x%016Lx does not match"
2059 " existing SA REGISTER res_key:"
2060 " 0x%016Lx\n", res_key
,
2061 pr_reg
->pr_res_key
);
2062 ret
= TCM_RESERVATION_CONFLICT
;
2067 pr_err("SPC-3 PR REGISTER: SPEC_I_PT"
2068 " set on a registered nexus\n");
2069 ret
= TCM_INVALID_PARAMETER_LIST
;
2074 * An existing ALL_TG_PT=1 registration being released
2075 * must also set ALL_TG_PT=1 in the incoming PROUT.
2077 if (pr_reg
->pr_reg_all_tg_pt
&& !all_tg_pt
) {
2078 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1"
2079 " registration exists, but ALL_TG_PT=1 bit not"
2080 " present in received PROUT\n");
2081 ret
= TCM_INVALID_CDB_FIELD
;
2086 * sa_res_key=1 Change Reservation Key for registered I_T Nexus.
2090 * Increment PRgeneration counter for struct se_device"
2091 * upon a successful REGISTER, see spc4r17 section 6.3.2
2092 * READ_KEYS service action.
2094 pr_reg
->pr_res_generation
= core_scsi3_pr_generation(cmd
->se_dev
);
2095 pr_reg
->pr_res_key
= sa_res_key
;
2096 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2097 " Key for %s to: 0x%016Lx PRgeneration:"
2098 " 0x%08x\n", cmd
->se_tfo
->get_fabric_name(),
2099 (register_type
== REGISTER_AND_IGNORE_EXISTING_KEY
) ? "_AND_IGNORE_EXISTING_KEY" : "",
2100 pr_reg
->pr_reg_nacl
->initiatorname
,
2101 pr_reg
->pr_res_key
, pr_reg
->pr_res_generation
);
2105 * sa_res_key=0 Unregister Reservation Key for registered I_T Nexus.
2107 pr_holder
= core_scsi3_check_implicit_release(
2108 cmd
->se_dev
, pr_reg
);
2109 if (pr_holder
< 0) {
2110 ret
= TCM_RESERVATION_CONFLICT
;
2113 type
= pr_reg
->pr_res_type
;
2115 spin_lock(&pr_tmpl
->registration_lock
);
2117 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2118 * and matching pr_res_key.
2120 if (pr_reg
->pr_reg_all_tg_pt
) {
2121 list_for_each_entry_safe(pr_reg_p
, pr_reg_tmp
,
2122 &pr_tmpl
->registration_list
,
2125 if (!pr_reg_p
->pr_reg_all_tg_pt
)
2127 if (pr_reg_p
->pr_res_key
!= res_key
)
2129 if (pr_reg
== pr_reg_p
)
2131 if (strcmp(pr_reg
->pr_reg_nacl
->initiatorname
,
2132 pr_reg_p
->pr_reg_nacl
->initiatorname
))
2135 __core_scsi3_free_registration(dev
,
2141 * Release the calling I_T Nexus registration now..
2143 __core_scsi3_free_registration(cmd
->se_dev
, pr_reg
, NULL
, 1);
2147 * From spc4r17, section 5.7.11.3 Unregistering
2149 * If the persistent reservation is a registrants only
2150 * type, the device server shall establish a unit
2151 * attention condition for the initiator port associated
2152 * with every registered I_T nexus except for the I_T
2153 * nexus on which the PERSISTENT RESERVE OUT command was
2154 * received, with the additional sense code set to
2155 * RESERVATIONS RELEASED.
2158 (type
== PR_TYPE_WRITE_EXCLUSIVE_REGONLY
||
2159 type
== PR_TYPE_EXCLUSIVE_ACCESS_REGONLY
)) {
2160 list_for_each_entry(pr_reg_p
,
2161 &pr_tmpl
->registration_list
,
2164 core_scsi3_ua_allocate(
2165 pr_reg_p
->pr_reg_nacl
,
2166 pr_reg_p
->pr_res_mapped_lun
,
2168 ASCQ_2AH_RESERVATIONS_RELEASED
);
2172 spin_unlock(&pr_tmpl
->registration_lock
);
2175 ret
= core_scsi3_update_and_write_aptpl(dev
, aptpl
);
2179 core_scsi3_put_pr_reg(pr_reg
);
2183 unsigned char *core_scsi3_pr_dump_type(int type
)
2186 case PR_TYPE_WRITE_EXCLUSIVE
:
2187 return "Write Exclusive Access";
2188 case PR_TYPE_EXCLUSIVE_ACCESS
:
2189 return "Exclusive Access";
2190 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY
:
2191 return "Write Exclusive Access, Registrants Only";
2192 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY
:
2193 return "Exclusive Access, Registrants Only";
2194 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG
:
2195 return "Write Exclusive Access, All Registrants";
2196 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG
:
2197 return "Exclusive Access, All Registrants";
2202 return "Unknown SPC-3 PR Type";
2205 static sense_reason_t
2206 core_scsi3_pro_reserve(struct se_cmd
*cmd
, int type
, int scope
, u64 res_key
)
2208 struct se_device
*dev
= cmd
->se_dev
;
2209 struct se_session
*se_sess
= cmd
->se_sess
;
2210 struct se_lun
*se_lun
= cmd
->se_lun
;
2211 struct t10_pr_registration
*pr_reg
, *pr_res_holder
;
2212 struct t10_reservation
*pr_tmpl
= &dev
->t10_pr
;
2213 char i_buf
[PR_REG_ISID_ID_LEN
];
2216 memset(i_buf
, 0, PR_REG_ISID_ID_LEN
);
2218 if (!se_sess
|| !se_lun
) {
2219 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2220 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2223 * Locate the existing *pr_reg via struct se_node_acl pointers
2225 pr_reg
= core_scsi3_locate_pr_reg(cmd
->se_dev
, se_sess
->se_node_acl
,
2228 pr_err("SPC-3 PR: Unable to locate"
2229 " PR_REGISTERED *pr_reg for RESERVE\n");
2230 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2233 * From spc4r17 Section 5.7.9: Reserving:
2235 * An application client creates a persistent reservation by issuing
2236 * a PERSISTENT RESERVE OUT command with RESERVE service action through
2237 * a registered I_T nexus with the following parameters:
2238 * a) RESERVATION KEY set to the value of the reservation key that is
2239 * registered with the logical unit for the I_T nexus; and
2241 if (res_key
!= pr_reg
->pr_res_key
) {
2242 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
2243 " does not match existing SA REGISTER res_key:"
2244 " 0x%016Lx\n", res_key
, pr_reg
->pr_res_key
);
2245 ret
= TCM_RESERVATION_CONFLICT
;
2246 goto out_put_pr_reg
;
2249 * From spc4r17 Section 5.7.9: Reserving:
2252 * b) TYPE field and SCOPE field set to the persistent reservation
2255 * Only one persistent reservation is allowed at a time per logical unit
2256 * and that persistent reservation has a scope of LU_SCOPE.
2258 if (scope
!= PR_SCOPE_LU_SCOPE
) {
2259 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope
);
2260 ret
= TCM_INVALID_PARAMETER_LIST
;
2261 goto out_put_pr_reg
;
2264 * See if we have an existing PR reservation holder pointer at
2265 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2268 spin_lock(&dev
->dev_reservation_lock
);
2269 pr_res_holder
= dev
->dev_pr_res_holder
;
2270 if (pr_res_holder
) {
2272 * From spc4r17 Section 5.7.9: Reserving:
2274 * If the device server receives a PERSISTENT RESERVE OUT
2275 * command from an I_T nexus other than a persistent reservation
2276 * holder (see 5.7.10) that attempts to create a persistent
2277 * reservation when a persistent reservation already exists for
2278 * the logical unit, then the command shall be completed with
2279 * RESERVATION CONFLICT status.
2281 if (pr_res_holder
!= pr_reg
) {
2282 struct se_node_acl
*pr_res_nacl
= pr_res_holder
->pr_reg_nacl
;
2283 pr_err("SPC-3 PR: Attempted RESERVE from"
2284 " [%s]: %s while reservation already held by"
2285 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2286 cmd
->se_tfo
->get_fabric_name(),
2287 se_sess
->se_node_acl
->initiatorname
,
2288 pr_res_nacl
->se_tpg
->se_tpg_tfo
->get_fabric_name(),
2289 pr_res_holder
->pr_reg_nacl
->initiatorname
);
2291 spin_unlock(&dev
->dev_reservation_lock
);
2292 ret
= TCM_RESERVATION_CONFLICT
;
2293 goto out_put_pr_reg
;
2296 * From spc4r17 Section 5.7.9: Reserving:
2298 * If a persistent reservation holder attempts to modify the
2299 * type or scope of an existing persistent reservation, the
2300 * command shall be completed with RESERVATION CONFLICT status.
2302 if ((pr_res_holder
->pr_res_type
!= type
) ||
2303 (pr_res_holder
->pr_res_scope
!= scope
)) {
2304 struct se_node_acl
*pr_res_nacl
= pr_res_holder
->pr_reg_nacl
;
2305 pr_err("SPC-3 PR: Attempted RESERVE from"
2306 " [%s]: %s trying to change TYPE and/or SCOPE,"
2307 " while reservation already held by [%s]: %s,"
2308 " returning RESERVATION_CONFLICT\n",
2309 cmd
->se_tfo
->get_fabric_name(),
2310 se_sess
->se_node_acl
->initiatorname
,
2311 pr_res_nacl
->se_tpg
->se_tpg_tfo
->get_fabric_name(),
2312 pr_res_holder
->pr_reg_nacl
->initiatorname
);
2314 spin_unlock(&dev
->dev_reservation_lock
);
2315 ret
= TCM_RESERVATION_CONFLICT
;
2316 goto out_put_pr_reg
;
2319 * From spc4r17 Section 5.7.9: Reserving:
2321 * If the device server receives a PERSISTENT RESERVE OUT
2322 * command with RESERVE service action where the TYPE field and
2323 * the SCOPE field contain the same values as the existing type
2324 * and scope from a persistent reservation holder, it shall not
2325 * make any change to the existing persistent reservation and
2326 * shall completethe command with GOOD status.
2328 spin_unlock(&dev
->dev_reservation_lock
);
2330 goto out_put_pr_reg
;
2333 * Otherwise, our *pr_reg becomes the PR reservation holder for said
2334 * TYPE/SCOPE. Also set the received scope and type in *pr_reg.
2336 pr_reg
->pr_res_scope
= scope
;
2337 pr_reg
->pr_res_type
= type
;
2338 pr_reg
->pr_res_holder
= 1;
2339 dev
->dev_pr_res_holder
= pr_reg
;
2340 core_pr_dump_initiator_port(pr_reg
, i_buf
, PR_REG_ISID_ID_LEN
);
2342 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
2343 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2344 cmd
->se_tfo
->get_fabric_name(), core_scsi3_pr_dump_type(type
),
2345 (pr_reg
->pr_reg_all_tg_pt
) ? 1 : 0);
2346 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
2347 cmd
->se_tfo
->get_fabric_name(),
2348 se_sess
->se_node_acl
->initiatorname
,
2350 spin_unlock(&dev
->dev_reservation_lock
);
2352 if (pr_tmpl
->pr_aptpl_active
)
2353 core_scsi3_update_and_write_aptpl(cmd
->se_dev
, true);
2357 core_scsi3_put_pr_reg(pr_reg
);
2361 static sense_reason_t
2362 core_scsi3_emulate_pro_reserve(struct se_cmd
*cmd
, int type
, int scope
,
2366 case PR_TYPE_WRITE_EXCLUSIVE
:
2367 case PR_TYPE_EXCLUSIVE_ACCESS
:
2368 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY
:
2369 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY
:
2370 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG
:
2371 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG
:
2372 return core_scsi3_pro_reserve(cmd
, type
, scope
, res_key
);
2374 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
2376 return TCM_INVALID_CDB_FIELD
;
2381 * Called with struct se_device->dev_reservation_lock held.
2383 static void __core_scsi3_complete_pro_release(
2384 struct se_device
*dev
,
2385 struct se_node_acl
*se_nacl
,
2386 struct t10_pr_registration
*pr_reg
,
2389 struct target_core_fabric_ops
*tfo
= se_nacl
->se_tpg
->se_tpg_tfo
;
2390 char i_buf
[PR_REG_ISID_ID_LEN
];
2392 memset(i_buf
, 0, PR_REG_ISID_ID_LEN
);
2393 core_pr_dump_initiator_port(pr_reg
, i_buf
, PR_REG_ISID_ID_LEN
);
2395 * Go ahead and release the current PR reservation holder.
2397 dev
->dev_pr_res_holder
= NULL
;
2399 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2400 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2401 tfo
->get_fabric_name(), (explicit) ? "explicit" : "implicit",
2402 core_scsi3_pr_dump_type(pr_reg
->pr_res_type
),
2403 (pr_reg
->pr_reg_all_tg_pt
) ? 1 : 0);
2404 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
2405 tfo
->get_fabric_name(), se_nacl
->initiatorname
,
2408 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2410 pr_reg
->pr_res_holder
= pr_reg
->pr_res_type
= pr_reg
->pr_res_scope
= 0;
2413 static sense_reason_t
2414 core_scsi3_emulate_pro_release(struct se_cmd
*cmd
, int type
, int scope
,
2417 struct se_device
*dev
= cmd
->se_dev
;
2418 struct se_session
*se_sess
= cmd
->se_sess
;
2419 struct se_lun
*se_lun
= cmd
->se_lun
;
2420 struct t10_pr_registration
*pr_reg
, *pr_reg_p
, *pr_res_holder
;
2421 struct t10_reservation
*pr_tmpl
= &dev
->t10_pr
;
2423 sense_reason_t ret
= 0;
2425 if (!se_sess
|| !se_lun
) {
2426 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2427 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2430 * Locate the existing *pr_reg via struct se_node_acl pointers
2432 pr_reg
= core_scsi3_locate_pr_reg(dev
, se_sess
->se_node_acl
, se_sess
);
2434 pr_err("SPC-3 PR: Unable to locate"
2435 " PR_REGISTERED *pr_reg for RELEASE\n");
2436 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2439 * From spc4r17 Section 5.7.11.2 Releasing:
2441 * If there is no persistent reservation or in response to a persistent
2442 * reservation release request from a registered I_T nexus that is not a
2443 * persistent reservation holder (see 5.7.10), the device server shall
2446 * a) Not release the persistent reservation, if any;
2447 * b) Not remove any registrations; and
2448 * c) Complete the command with GOOD status.
2450 spin_lock(&dev
->dev_reservation_lock
);
2451 pr_res_holder
= dev
->dev_pr_res_holder
;
2452 if (!pr_res_holder
) {
2454 * No persistent reservation, return GOOD status.
2456 spin_unlock(&dev
->dev_reservation_lock
);
2457 goto out_put_pr_reg
;
2459 if ((pr_res_holder
->pr_res_type
== PR_TYPE_WRITE_EXCLUSIVE_ALLREG
) ||
2460 (pr_res_holder
->pr_res_type
== PR_TYPE_EXCLUSIVE_ACCESS_ALLREG
))
2463 if ((all_reg
== 0) && (pr_res_holder
!= pr_reg
)) {
2465 * Non 'All Registrants' PR Type cases..
2466 * Release request from a registered I_T nexus that is not a
2467 * persistent reservation holder. return GOOD status.
2469 spin_unlock(&dev
->dev_reservation_lock
);
2470 goto out_put_pr_reg
;
2474 * From spc4r17 Section 5.7.11.2 Releasing:
2476 * Only the persistent reservation holder (see 5.7.10) is allowed to
2477 * release a persistent reservation.
2479 * An application client releases the persistent reservation by issuing
2480 * a PERSISTENT RESERVE OUT command with RELEASE service action through
2481 * an I_T nexus that is a persistent reservation holder with the
2482 * following parameters:
2484 * a) RESERVATION KEY field set to the value of the reservation key
2485 * that is registered with the logical unit for the I_T nexus;
2487 if (res_key
!= pr_reg
->pr_res_key
) {
2488 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
2489 " does not match existing SA REGISTER res_key:"
2490 " 0x%016Lx\n", res_key
, pr_reg
->pr_res_key
);
2491 spin_unlock(&dev
->dev_reservation_lock
);
2492 ret
= TCM_RESERVATION_CONFLICT
;
2493 goto out_put_pr_reg
;
2496 * From spc4r17 Section 5.7.11.2 Releasing and above:
2498 * b) TYPE field and SCOPE field set to match the persistent
2499 * reservation being released.
2501 if ((pr_res_holder
->pr_res_type
!= type
) ||
2502 (pr_res_holder
->pr_res_scope
!= scope
)) {
2503 struct se_node_acl
*pr_res_nacl
= pr_res_holder
->pr_reg_nacl
;
2504 pr_err("SPC-3 PR RELEASE: Attempted to release"
2505 " reservation from [%s]: %s with different TYPE "
2506 "and/or SCOPE while reservation already held by"
2507 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2508 cmd
->se_tfo
->get_fabric_name(),
2509 se_sess
->se_node_acl
->initiatorname
,
2510 pr_res_nacl
->se_tpg
->se_tpg_tfo
->get_fabric_name(),
2511 pr_res_holder
->pr_reg_nacl
->initiatorname
);
2513 spin_unlock(&dev
->dev_reservation_lock
);
2514 ret
= TCM_RESERVATION_CONFLICT
;
2515 goto out_put_pr_reg
;
2518 * In response to a persistent reservation release request from the
2519 * persistent reservation holder the device server shall perform a
2520 * release by doing the following as an uninterrupted series of actions:
2521 * a) Release the persistent reservation;
2522 * b) Not remove any registration(s);
2523 * c) If the released persistent reservation is a registrants only type
2524 * or all registrants type persistent reservation,
2525 * the device server shall establish a unit attention condition for
2526 * the initiator port associated with every regis-
2527 * tered I_T nexus other than I_T nexus on which the PERSISTENT
2528 * RESERVE OUT command with RELEASE service action was received,
2529 * with the additional sense code set to RESERVATIONS RELEASED; and
2530 * d) If the persistent reservation is of any other type, the device
2531 * server shall not establish a unit attention condition.
2533 __core_scsi3_complete_pro_release(dev
, se_sess
->se_node_acl
,
2536 spin_unlock(&dev
->dev_reservation_lock
);
2538 if ((type
!= PR_TYPE_WRITE_EXCLUSIVE_REGONLY
) &&
2539 (type
!= PR_TYPE_EXCLUSIVE_ACCESS_REGONLY
) &&
2540 (type
!= PR_TYPE_WRITE_EXCLUSIVE_ALLREG
) &&
2541 (type
!= PR_TYPE_EXCLUSIVE_ACCESS_ALLREG
)) {
2543 * If no UNIT ATTENTION conditions will be established for
2544 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2545 * go ahead and check for APTPL=1 update+write below
2550 spin_lock(&pr_tmpl
->registration_lock
);
2551 list_for_each_entry(pr_reg_p
, &pr_tmpl
->registration_list
,
2554 * Do not establish a UNIT ATTENTION condition
2555 * for the calling I_T Nexus
2557 if (pr_reg_p
== pr_reg
)
2560 core_scsi3_ua_allocate(pr_reg_p
->pr_reg_nacl
,
2561 pr_reg_p
->pr_res_mapped_lun
,
2562 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED
);
2564 spin_unlock(&pr_tmpl
->registration_lock
);
2567 if (pr_tmpl
->pr_aptpl_active
)
2568 core_scsi3_update_and_write_aptpl(cmd
->se_dev
, true);
2571 core_scsi3_put_pr_reg(pr_reg
);
2575 static sense_reason_t
2576 core_scsi3_emulate_pro_clear(struct se_cmd
*cmd
, u64 res_key
)
2578 struct se_device
*dev
= cmd
->se_dev
;
2579 struct se_node_acl
*pr_reg_nacl
;
2580 struct se_session
*se_sess
= cmd
->se_sess
;
2581 struct t10_reservation
*pr_tmpl
= &dev
->t10_pr
;
2582 struct t10_pr_registration
*pr_reg
, *pr_reg_tmp
, *pr_reg_n
, *pr_res_holder
;
2583 u32 pr_res_mapped_lun
= 0;
2584 int calling_it_nexus
= 0;
2586 * Locate the existing *pr_reg via struct se_node_acl pointers
2588 pr_reg_n
= core_scsi3_locate_pr_reg(cmd
->se_dev
,
2589 se_sess
->se_node_acl
, se_sess
);
2591 pr_err("SPC-3 PR: Unable to locate"
2592 " PR_REGISTERED *pr_reg for CLEAR\n");
2593 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2596 * From spc4r17 section 5.7.11.6, Clearing:
2598 * Any application client may release the persistent reservation and
2599 * remove all registrations from a device server by issuing a
2600 * PERSISTENT RESERVE OUT command with CLEAR service action through a
2601 * registered I_T nexus with the following parameter:
2603 * a) RESERVATION KEY field set to the value of the reservation key
2604 * that is registered with the logical unit for the I_T nexus.
2606 if (res_key
!= pr_reg_n
->pr_res_key
) {
2607 pr_err("SPC-3 PR REGISTER: Received"
2608 " res_key: 0x%016Lx does not match"
2609 " existing SA REGISTER res_key:"
2610 " 0x%016Lx\n", res_key
, pr_reg_n
->pr_res_key
);
2611 core_scsi3_put_pr_reg(pr_reg_n
);
2612 return TCM_RESERVATION_CONFLICT
;
2615 * a) Release the persistent reservation, if any;
2617 spin_lock(&dev
->dev_reservation_lock
);
2618 pr_res_holder
= dev
->dev_pr_res_holder
;
2619 if (pr_res_holder
) {
2620 struct se_node_acl
*pr_res_nacl
= pr_res_holder
->pr_reg_nacl
;
2621 __core_scsi3_complete_pro_release(dev
, pr_res_nacl
,
2624 spin_unlock(&dev
->dev_reservation_lock
);
2626 * b) Remove all registration(s) (see spc4r17 5.7.7);
2628 spin_lock(&pr_tmpl
->registration_lock
);
2629 list_for_each_entry_safe(pr_reg
, pr_reg_tmp
,
2630 &pr_tmpl
->registration_list
, pr_reg_list
) {
2632 calling_it_nexus
= (pr_reg_n
== pr_reg
) ? 1 : 0;
2633 pr_reg_nacl
= pr_reg
->pr_reg_nacl
;
2634 pr_res_mapped_lun
= pr_reg
->pr_res_mapped_lun
;
2635 __core_scsi3_free_registration(dev
, pr_reg
, NULL
,
2638 * e) Establish a unit attention condition for the initiator
2639 * port associated with every registered I_T nexus other
2640 * than the I_T nexus on which the PERSISTENT RESERVE OUT
2641 * command with CLEAR service action was received, with the
2642 * additional sense code set to RESERVATIONS PREEMPTED.
2644 if (!calling_it_nexus
)
2645 core_scsi3_ua_allocate(pr_reg_nacl
, pr_res_mapped_lun
,
2646 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED
);
2648 spin_unlock(&pr_tmpl
->registration_lock
);
2650 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
2651 cmd
->se_tfo
->get_fabric_name());
2653 core_scsi3_update_and_write_aptpl(cmd
->se_dev
, false);
2655 core_scsi3_pr_generation(dev
);
2660 * Called with struct se_device->dev_reservation_lock held.
2662 static void __core_scsi3_complete_pro_preempt(
2663 struct se_device
*dev
,
2664 struct t10_pr_registration
*pr_reg
,
2665 struct list_head
*preempt_and_abort_list
,
2668 enum preempt_type preempt_type
)
2670 struct se_node_acl
*nacl
= pr_reg
->pr_reg_nacl
;
2671 struct target_core_fabric_ops
*tfo
= nacl
->se_tpg
->se_tpg_tfo
;
2672 char i_buf
[PR_REG_ISID_ID_LEN
];
2674 memset(i_buf
, 0, PR_REG_ISID_ID_LEN
);
2675 core_pr_dump_initiator_port(pr_reg
, i_buf
, PR_REG_ISID_ID_LEN
);
2677 * Do an implicit RELEASE of the existing reservation.
2679 if (dev
->dev_pr_res_holder
)
2680 __core_scsi3_complete_pro_release(dev
, nacl
,
2681 dev
->dev_pr_res_holder
, 0);
2683 dev
->dev_pr_res_holder
= pr_reg
;
2684 pr_reg
->pr_res_holder
= 1;
2685 pr_reg
->pr_res_type
= type
;
2686 pr_reg
->pr_res_scope
= scope
;
2688 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
2689 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2690 tfo
->get_fabric_name(), (preempt_type
== PREEMPT_AND_ABORT
) ? "_AND_ABORT" : "",
2691 core_scsi3_pr_dump_type(type
),
2692 (pr_reg
->pr_reg_all_tg_pt
) ? 1 : 0);
2693 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
2694 tfo
->get_fabric_name(), (preempt_type
== PREEMPT_AND_ABORT
) ? "_AND_ABORT" : "",
2695 nacl
->initiatorname
, i_buf
);
2697 * For PREEMPT_AND_ABORT, add the preempting reservation's
2698 * struct t10_pr_registration to the list that will be compared
2699 * against received CDBs..
2701 if (preempt_and_abort_list
)
2702 list_add_tail(&pr_reg
->pr_reg_abort_list
,
2703 preempt_and_abort_list
);
2706 static void core_scsi3_release_preempt_and_abort(
2707 struct list_head
*preempt_and_abort_list
,
2708 struct t10_pr_registration
*pr_reg_holder
)
2710 struct t10_pr_registration
*pr_reg
, *pr_reg_tmp
;
2712 list_for_each_entry_safe(pr_reg
, pr_reg_tmp
, preempt_and_abort_list
,
2713 pr_reg_abort_list
) {
2715 list_del(&pr_reg
->pr_reg_abort_list
);
2716 if (pr_reg_holder
== pr_reg
)
2718 if (pr_reg
->pr_res_holder
) {
2719 pr_warn("pr_reg->pr_res_holder still set\n");
2723 pr_reg
->pr_reg_deve
= NULL
;
2724 pr_reg
->pr_reg_nacl
= NULL
;
2725 kmem_cache_free(t10_pr_reg_cache
, pr_reg
);
2729 static sense_reason_t
2730 core_scsi3_pro_preempt(struct se_cmd
*cmd
, int type
, int scope
, u64 res_key
,
2731 u64 sa_res_key
, enum preempt_type preempt_type
)
2733 struct se_device
*dev
= cmd
->se_dev
;
2734 struct se_node_acl
*pr_reg_nacl
;
2735 struct se_session
*se_sess
= cmd
->se_sess
;
2736 LIST_HEAD(preempt_and_abort_list
);
2737 struct t10_pr_registration
*pr_reg
, *pr_reg_tmp
, *pr_reg_n
, *pr_res_holder
;
2738 struct t10_reservation
*pr_tmpl
= &dev
->t10_pr
;
2739 u32 pr_res_mapped_lun
= 0;
2740 int all_reg
= 0, calling_it_nexus
= 0, released_regs
= 0;
2741 int prh_type
= 0, prh_scope
= 0;
2744 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2746 pr_reg_n
= core_scsi3_locate_pr_reg(cmd
->se_dev
, se_sess
->se_node_acl
,
2749 pr_err("SPC-3 PR: Unable to locate"
2750 " PR_REGISTERED *pr_reg for PREEMPT%s\n",
2751 (preempt_type
== PREEMPT_AND_ABORT
) ? "_AND_ABORT" : "");
2752 return TCM_RESERVATION_CONFLICT
;
2754 if (pr_reg_n
->pr_res_key
!= res_key
) {
2755 core_scsi3_put_pr_reg(pr_reg_n
);
2756 return TCM_RESERVATION_CONFLICT
;
2758 if (scope
!= PR_SCOPE_LU_SCOPE
) {
2759 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope
);
2760 core_scsi3_put_pr_reg(pr_reg_n
);
2761 return TCM_INVALID_PARAMETER_LIST
;
2764 spin_lock(&dev
->dev_reservation_lock
);
2765 pr_res_holder
= dev
->dev_pr_res_holder
;
2766 if (pr_res_holder
&&
2767 ((pr_res_holder
->pr_res_type
== PR_TYPE_WRITE_EXCLUSIVE_ALLREG
) ||
2768 (pr_res_holder
->pr_res_type
== PR_TYPE_EXCLUSIVE_ACCESS_ALLREG
)))
2771 if (!all_reg
&& !sa_res_key
) {
2772 spin_unlock(&dev
->dev_reservation_lock
);
2773 core_scsi3_put_pr_reg(pr_reg_n
);
2774 return TCM_INVALID_PARAMETER_LIST
;
2777 * From spc4r17, section 5.7.11.4.4 Removing Registrations:
2779 * If the SERVICE ACTION RESERVATION KEY field does not identify a
2780 * persistent reservation holder or there is no persistent reservation
2781 * holder (i.e., there is no persistent reservation), then the device
2782 * server shall perform a preempt by doing the following in an
2783 * uninterrupted series of actions. (See below..)
2785 if (!pr_res_holder
|| (pr_res_holder
->pr_res_key
!= sa_res_key
)) {
2787 * No existing or SA Reservation Key matching reservations..
2789 * PROUT SA PREEMPT with All Registrant type reservations are
2790 * allowed to be processed without a matching SA Reservation Key
2792 spin_lock(&pr_tmpl
->registration_lock
);
2793 list_for_each_entry_safe(pr_reg
, pr_reg_tmp
,
2794 &pr_tmpl
->registration_list
, pr_reg_list
) {
2796 * Removing of registrations in non all registrants
2797 * type reservations without a matching SA reservation
2800 * a) Remove the registrations for all I_T nexuses
2801 * specified by the SERVICE ACTION RESERVATION KEY
2803 * b) Ignore the contents of the SCOPE and TYPE fields;
2804 * c) Process tasks as defined in 5.7.1; and
2805 * d) Establish a unit attention condition for the
2806 * initiator port associated with every I_T nexus
2807 * that lost its registration other than the I_T
2808 * nexus on which the PERSISTENT RESERVE OUT command
2809 * was received, with the additional sense code set
2810 * to REGISTRATIONS PREEMPTED.
2813 if (pr_reg
->pr_res_key
!= sa_res_key
)
2816 calling_it_nexus
= (pr_reg_n
== pr_reg
) ? 1 : 0;
2817 pr_reg_nacl
= pr_reg
->pr_reg_nacl
;
2818 pr_res_mapped_lun
= pr_reg
->pr_res_mapped_lun
;
2819 __core_scsi3_free_registration(dev
, pr_reg
,
2820 (preempt_type
== PREEMPT_AND_ABORT
) ? &preempt_and_abort_list
:
2821 NULL
, calling_it_nexus
);
2825 * Case for any existing all registrants type
2826 * reservation, follow logic in spc4r17 section
2827 * 5.7.11.4 Preempting, Table 52 and Figure 7.
2829 * For a ZERO SA Reservation key, release
2830 * all other registrations and do an implicit
2831 * release of active persistent reservation.
2833 * For a non-ZERO SA Reservation key, only
2834 * release the matching reservation key from
2838 (pr_reg
->pr_res_key
!= sa_res_key
))
2841 calling_it_nexus
= (pr_reg_n
== pr_reg
) ? 1 : 0;
2842 if (calling_it_nexus
)
2845 pr_reg_nacl
= pr_reg
->pr_reg_nacl
;
2846 pr_res_mapped_lun
= pr_reg
->pr_res_mapped_lun
;
2847 __core_scsi3_free_registration(dev
, pr_reg
,
2848 (preempt_type
== PREEMPT_AND_ABORT
) ? &preempt_and_abort_list
:
2852 if (!calling_it_nexus
)
2853 core_scsi3_ua_allocate(pr_reg_nacl
,
2854 pr_res_mapped_lun
, 0x2A,
2855 ASCQ_2AH_REGISTRATIONS_PREEMPTED
);
2857 spin_unlock(&pr_tmpl
->registration_lock
);
2859 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
2860 * a PREEMPT AND ABORT service action sets the SERVICE ACTION
2861 * RESERVATION KEY field to a value that does not match any
2862 * registered reservation key, then the device server shall
2863 * complete the command with RESERVATION CONFLICT status.
2865 if (!released_regs
) {
2866 spin_unlock(&dev
->dev_reservation_lock
);
2867 core_scsi3_put_pr_reg(pr_reg_n
);
2868 return TCM_RESERVATION_CONFLICT
;
2871 * For an existing all registrants type reservation
2872 * with a zero SA rservation key, preempt the existing
2873 * reservation with the new PR type and scope.
2875 if (pr_res_holder
&& all_reg
&& !(sa_res_key
)) {
2876 __core_scsi3_complete_pro_preempt(dev
, pr_reg_n
,
2877 (preempt_type
== PREEMPT_AND_ABORT
) ? &preempt_and_abort_list
: NULL
,
2878 type
, scope
, preempt_type
);
2880 if (preempt_type
== PREEMPT_AND_ABORT
)
2881 core_scsi3_release_preempt_and_abort(
2882 &preempt_and_abort_list
, pr_reg_n
);
2884 spin_unlock(&dev
->dev_reservation_lock
);
2886 if (pr_tmpl
->pr_aptpl_active
)
2887 core_scsi3_update_and_write_aptpl(cmd
->se_dev
, true);
2889 core_scsi3_put_pr_reg(pr_reg_n
);
2890 core_scsi3_pr_generation(cmd
->se_dev
);
2894 * The PREEMPTing SA reservation key matches that of the
2895 * existing persistent reservation, first, we check if
2896 * we are preempting our own reservation.
2897 * From spc4r17, section 5.7.11.4.3 Preempting
2898 * persistent reservations and registration handling
2900 * If an all registrants persistent reservation is not
2901 * present, it is not an error for the persistent
2902 * reservation holder to preempt itself (i.e., a
2903 * PERSISTENT RESERVE OUT with a PREEMPT service action
2904 * or a PREEMPT AND ABORT service action with the
2905 * SERVICE ACTION RESERVATION KEY value equal to the
2906 * persistent reservation holder's reservation key that
2907 * is received from the persistent reservation holder).
2908 * In that case, the device server shall establish the
2909 * new persistent reservation and maintain the
2912 prh_type
= pr_res_holder
->pr_res_type
;
2913 prh_scope
= pr_res_holder
->pr_res_scope
;
2915 * If the SERVICE ACTION RESERVATION KEY field identifies a
2916 * persistent reservation holder (see 5.7.10), the device
2917 * server shall perform a preempt by doing the following as
2918 * an uninterrupted series of actions:
2920 * a) Release the persistent reservation for the holder
2921 * identified by the SERVICE ACTION RESERVATION KEY field;
2923 if (pr_reg_n
!= pr_res_holder
)
2924 __core_scsi3_complete_pro_release(dev
,
2925 pr_res_holder
->pr_reg_nacl
,
2926 dev
->dev_pr_res_holder
, 0);
2928 * b) Remove the registrations for all I_T nexuses identified
2929 * by the SERVICE ACTION RESERVATION KEY field, except the
2930 * I_T nexus that is being used for the PERSISTENT RESERVE
2931 * OUT command. If an all registrants persistent reservation
2932 * is present and the SERVICE ACTION RESERVATION KEY field
2933 * is set to zero, then all registrations shall be removed
2934 * except for that of the I_T nexus that is being used for
2935 * the PERSISTENT RESERVE OUT command;
2937 spin_lock(&pr_tmpl
->registration_lock
);
2938 list_for_each_entry_safe(pr_reg
, pr_reg_tmp
,
2939 &pr_tmpl
->registration_list
, pr_reg_list
) {
2941 calling_it_nexus
= (pr_reg_n
== pr_reg
) ? 1 : 0;
2942 if (calling_it_nexus
)
2945 if (pr_reg
->pr_res_key
!= sa_res_key
)
2948 pr_reg_nacl
= pr_reg
->pr_reg_nacl
;
2949 pr_res_mapped_lun
= pr_reg
->pr_res_mapped_lun
;
2950 __core_scsi3_free_registration(dev
, pr_reg
,
2951 (preempt_type
== PREEMPT_AND_ABORT
) ? &preempt_and_abort_list
: NULL
,
2954 * e) Establish a unit attention condition for the initiator
2955 * port associated with every I_T nexus that lost its
2956 * persistent reservation and/or registration, with the
2957 * additional sense code set to REGISTRATIONS PREEMPTED;
2959 core_scsi3_ua_allocate(pr_reg_nacl
, pr_res_mapped_lun
, 0x2A,
2960 ASCQ_2AH_REGISTRATIONS_PREEMPTED
);
2962 spin_unlock(&pr_tmpl
->registration_lock
);
2964 * c) Establish a persistent reservation for the preempting
2965 * I_T nexus using the contents of the SCOPE and TYPE fields;
2967 __core_scsi3_complete_pro_preempt(dev
, pr_reg_n
,
2968 (preempt_type
== PREEMPT_AND_ABORT
) ? &preempt_and_abort_list
: NULL
,
2969 type
, scope
, preempt_type
);
2971 * d) Process tasks as defined in 5.7.1;
2973 * f) If the type or scope has changed, then for every I_T nexus
2974 * whose reservation key was not removed, except for the I_T
2975 * nexus on which the PERSISTENT RESERVE OUT command was
2976 * received, the device server shall establish a unit
2977 * attention condition for the initiator port associated with
2978 * that I_T nexus, with the additional sense code set to
2979 * RESERVATIONS RELEASED. If the type or scope have not
2980 * changed, then no unit attention condition(s) shall be
2981 * established for this reason.
2983 if ((prh_type
!= type
) || (prh_scope
!= scope
)) {
2984 spin_lock(&pr_tmpl
->registration_lock
);
2985 list_for_each_entry_safe(pr_reg
, pr_reg_tmp
,
2986 &pr_tmpl
->registration_list
, pr_reg_list
) {
2988 calling_it_nexus
= (pr_reg_n
== pr_reg
) ? 1 : 0;
2989 if (calling_it_nexus
)
2992 core_scsi3_ua_allocate(pr_reg
->pr_reg_nacl
,
2993 pr_reg
->pr_res_mapped_lun
, 0x2A,
2994 ASCQ_2AH_RESERVATIONS_RELEASED
);
2996 spin_unlock(&pr_tmpl
->registration_lock
);
2998 spin_unlock(&dev
->dev_reservation_lock
);
3000 * Call LUN_RESET logic upon list of struct t10_pr_registration,
3001 * All received CDBs for the matching existing reservation and
3002 * registrations undergo ABORT_TASK logic.
3004 * From there, core_scsi3_release_preempt_and_abort() will
3005 * release every registration in the list (which have already
3006 * been removed from the primary pr_reg list), except the
3007 * new persistent reservation holder, the calling Initiator Port.
3009 if (preempt_type
== PREEMPT_AND_ABORT
) {
3010 core_tmr_lun_reset(dev
, NULL
, &preempt_and_abort_list
, cmd
);
3011 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list
,
3015 if (pr_tmpl
->pr_aptpl_active
)
3016 core_scsi3_update_and_write_aptpl(cmd
->se_dev
, true);
3018 core_scsi3_put_pr_reg(pr_reg_n
);
3019 core_scsi3_pr_generation(cmd
->se_dev
);
3023 static sense_reason_t
3024 core_scsi3_emulate_pro_preempt(struct se_cmd
*cmd
, int type
, int scope
,
3025 u64 res_key
, u64 sa_res_key
, enum preempt_type preempt_type
)
3028 case PR_TYPE_WRITE_EXCLUSIVE
:
3029 case PR_TYPE_EXCLUSIVE_ACCESS
:
3030 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY
:
3031 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY
:
3032 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG
:
3033 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG
:
3034 return core_scsi3_pro_preempt(cmd
, type
, scope
, res_key
,
3035 sa_res_key
, preempt_type
);
3037 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
3038 " Type: 0x%02x\n", (preempt_type
== PREEMPT_AND_ABORT
) ? "_AND_ABORT" : "", type
);
3039 return TCM_INVALID_CDB_FIELD
;
3044 static sense_reason_t
3045 core_scsi3_emulate_pro_register_and_move(struct se_cmd
*cmd
, u64 res_key
,
3046 u64 sa_res_key
, int aptpl
, int unreg
)
3048 struct se_session
*se_sess
= cmd
->se_sess
;
3049 struct se_device
*dev
= cmd
->se_dev
;
3050 struct se_dev_entry
*dest_se_deve
= NULL
;
3051 struct se_lun
*se_lun
= cmd
->se_lun
;
3052 struct se_node_acl
*pr_res_nacl
, *pr_reg_nacl
, *dest_node_acl
= NULL
;
3053 struct se_port
*se_port
;
3054 struct se_portal_group
*se_tpg
, *dest_se_tpg
= NULL
;
3055 struct target_core_fabric_ops
*dest_tf_ops
= NULL
, *tf_ops
;
3056 struct t10_pr_registration
*pr_reg
, *pr_res_holder
, *dest_pr_reg
;
3057 struct t10_reservation
*pr_tmpl
= &dev
->t10_pr
;
3059 unsigned char *initiator_str
;
3060 char *iport_ptr
= NULL
, dest_iport
[64], i_buf
[PR_REG_ISID_ID_LEN
];
3061 u32 tid_len
, tmp_tid_len
;
3062 int new_reg
= 0, type
, scope
, matching_iname
;
3064 unsigned short rtpi
;
3065 unsigned char proto_ident
;
3067 if (!se_sess
|| !se_lun
) {
3068 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
3069 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3072 memset(dest_iport
, 0, 64);
3073 memset(i_buf
, 0, PR_REG_ISID_ID_LEN
);
3074 se_tpg
= se_sess
->se_tpg
;
3075 tf_ops
= se_tpg
->se_tpg_tfo
;
3077 * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3078 * Register behaviors for a REGISTER AND MOVE service action
3080 * Locate the existing *pr_reg via struct se_node_acl pointers
3082 pr_reg
= core_scsi3_locate_pr_reg(cmd
->se_dev
, se_sess
->se_node_acl
,
3085 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
3086 " *pr_reg for REGISTER_AND_MOVE\n");
3087 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3090 * The provided reservation key much match the existing reservation key
3091 * provided during this initiator's I_T nexus registration.
3093 if (res_key
!= pr_reg
->pr_res_key
) {
3094 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
3095 " res_key: 0x%016Lx does not match existing SA REGISTER"
3096 " res_key: 0x%016Lx\n", res_key
, pr_reg
->pr_res_key
);
3097 ret
= TCM_RESERVATION_CONFLICT
;
3098 goto out_put_pr_reg
;
3101 * The service active reservation key needs to be non zero
3104 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
3106 ret
= TCM_INVALID_PARAMETER_LIST
;
3107 goto out_put_pr_reg
;
3111 * Determine the Relative Target Port Identifier where the reservation
3112 * will be moved to for the TransportID containing SCSI initiator WWN
3115 buf
= transport_kmap_data_sg(cmd
);
3117 ret
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3118 goto out_put_pr_reg
;
3121 rtpi
= (buf
[18] & 0xff) << 8;
3122 rtpi
|= buf
[19] & 0xff;
3123 tid_len
= (buf
[20] & 0xff) << 24;
3124 tid_len
|= (buf
[21] & 0xff) << 16;
3125 tid_len
|= (buf
[22] & 0xff) << 8;
3126 tid_len
|= buf
[23] & 0xff;
3127 transport_kunmap_data_sg(cmd
);
3130 if ((tid_len
+ 24) != cmd
->data_length
) {
3131 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
3132 " does not equal CDB data_length: %u\n", tid_len
,
3134 ret
= TCM_INVALID_PARAMETER_LIST
;
3135 goto out_put_pr_reg
;
3138 spin_lock(&dev
->se_port_lock
);
3139 list_for_each_entry(se_port
, &dev
->dev_sep_list
, sep_list
) {
3140 if (se_port
->sep_rtpi
!= rtpi
)
3142 dest_se_tpg
= se_port
->sep_tpg
;
3145 dest_tf_ops
= dest_se_tpg
->se_tpg_tfo
;
3149 atomic_inc_mb(&dest_se_tpg
->tpg_pr_ref_count
);
3150 spin_unlock(&dev
->se_port_lock
);
3152 if (core_scsi3_tpg_depend_item(dest_se_tpg
)) {
3153 pr_err("core_scsi3_tpg_depend_item() failed"
3154 " for dest_se_tpg\n");
3155 atomic_dec_mb(&dest_se_tpg
->tpg_pr_ref_count
);
3156 ret
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3157 goto out_put_pr_reg
;
3160 spin_lock(&dev
->se_port_lock
);
3163 spin_unlock(&dev
->se_port_lock
);
3165 if (!dest_se_tpg
|| !dest_tf_ops
) {
3166 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3167 " fabric ops from Relative Target Port Identifier:"
3169 ret
= TCM_INVALID_PARAMETER_LIST
;
3170 goto out_put_pr_reg
;
3173 buf
= transport_kmap_data_sg(cmd
);
3175 ret
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3176 goto out_put_pr_reg
;
3178 proto_ident
= (buf
[24] & 0x0f);
3180 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
3181 " 0x%02x\n", proto_ident
);
3183 if (proto_ident
!= dest_tf_ops
->get_fabric_proto_ident(dest_se_tpg
)) {
3184 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
3185 " proto_ident: 0x%02x does not match ident: 0x%02x"
3186 " from fabric: %s\n", proto_ident
,
3187 dest_tf_ops
->get_fabric_proto_ident(dest_se_tpg
),
3188 dest_tf_ops
->get_fabric_name());
3189 ret
= TCM_INVALID_PARAMETER_LIST
;
3192 if (dest_tf_ops
->tpg_parse_pr_out_transport_id
== NULL
) {
3193 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not"
3194 " containg a valid tpg_parse_pr_out_transport_id"
3195 " function pointer\n");
3196 ret
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3199 initiator_str
= dest_tf_ops
->tpg_parse_pr_out_transport_id(dest_se_tpg
,
3200 (const char *)&buf
[24], &tmp_tid_len
, &iport_ptr
);
3201 if (!initiator_str
) {
3202 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3203 " initiator_str from Transport ID\n");
3204 ret
= TCM_INVALID_PARAMETER_LIST
;
3208 transport_kunmap_data_sg(cmd
);
3211 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
3212 " %s\n", dest_tf_ops
->get_fabric_name(), (iport_ptr
!= NULL
) ?
3213 "port" : "device", initiator_str
, (iport_ptr
!= NULL
) ?
3216 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3217 * action specifies a TransportID that is the same as the initiator port
3218 * of the I_T nexus for the command received, then the command shall
3219 * be terminated with CHECK CONDITION status, with the sense key set to
3220 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3221 * IN PARAMETER LIST.
3223 pr_reg_nacl
= pr_reg
->pr_reg_nacl
;
3224 matching_iname
= (!strcmp(initiator_str
,
3225 pr_reg_nacl
->initiatorname
)) ? 1 : 0;
3226 if (!matching_iname
)
3227 goto after_iport_check
;
3229 if (!iport_ptr
|| !pr_reg
->isid_present_at_reg
) {
3230 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
3231 " matches: %s on received I_T Nexus\n", initiator_str
,
3232 pr_reg_nacl
->initiatorname
);
3233 ret
= TCM_INVALID_PARAMETER_LIST
;
3236 if (!strcmp(iport_ptr
, pr_reg
->pr_reg_isid
)) {
3237 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
3238 " matches: %s %s on received I_T Nexus\n",
3239 initiator_str
, iport_ptr
, pr_reg_nacl
->initiatorname
,
3240 pr_reg
->pr_reg_isid
);
3241 ret
= TCM_INVALID_PARAMETER_LIST
;
3246 * Locate the destination struct se_node_acl from the received Transport ID
3248 spin_lock_irq(&dest_se_tpg
->acl_node_lock
);
3249 dest_node_acl
= __core_tpg_get_initiator_node_acl(dest_se_tpg
,
3252 atomic_inc_mb(&dest_node_acl
->acl_pr_ref_count
);
3253 spin_unlock_irq(&dest_se_tpg
->acl_node_lock
);
3255 if (!dest_node_acl
) {
3256 pr_err("Unable to locate %s dest_node_acl for"
3257 " TransportID%s\n", dest_tf_ops
->get_fabric_name(),
3259 ret
= TCM_INVALID_PARAMETER_LIST
;
3263 if (core_scsi3_nodeacl_depend_item(dest_node_acl
)) {
3264 pr_err("core_scsi3_nodeacl_depend_item() for"
3265 " dest_node_acl\n");
3266 atomic_dec_mb(&dest_node_acl
->acl_pr_ref_count
);
3267 dest_node_acl
= NULL
;
3268 ret
= TCM_INVALID_PARAMETER_LIST
;
3272 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
3273 " %s from TransportID\n", dest_tf_ops
->get_fabric_name(),
3274 dest_node_acl
->initiatorname
);
3277 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3280 dest_se_deve
= core_get_se_deve_from_rtpi(dest_node_acl
, rtpi
);
3281 if (!dest_se_deve
) {
3282 pr_err("Unable to locate %s dest_se_deve from RTPI:"
3283 " %hu\n", dest_tf_ops
->get_fabric_name(), rtpi
);
3284 ret
= TCM_INVALID_PARAMETER_LIST
;
3288 if (core_scsi3_lunacl_depend_item(dest_se_deve
)) {
3289 pr_err("core_scsi3_lunacl_depend_item() failed\n");
3290 atomic_dec_mb(&dest_se_deve
->pr_ref_count
);
3291 dest_se_deve
= NULL
;
3292 ret
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3296 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
3297 " ACL for dest_se_deve->mapped_lun: %u\n",
3298 dest_tf_ops
->get_fabric_name(), dest_node_acl
->initiatorname
,
3299 dest_se_deve
->mapped_lun
);
3302 * A persistent reservation needs to already existing in order to
3303 * successfully complete the REGISTER_AND_MOVE service action..
3305 spin_lock(&dev
->dev_reservation_lock
);
3306 pr_res_holder
= dev
->dev_pr_res_holder
;
3307 if (!pr_res_holder
) {
3308 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
3309 " currently held\n");
3310 spin_unlock(&dev
->dev_reservation_lock
);
3311 ret
= TCM_INVALID_CDB_FIELD
;
3315 * The received on I_T Nexus must be the reservation holder.
3317 * From spc4r17 section 5.7.8 Table 50 --
3318 * Register behaviors for a REGISTER AND MOVE service action
3320 if (pr_res_holder
!= pr_reg
) {
3321 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
3322 " Nexus is not reservation holder\n");
3323 spin_unlock(&dev
->dev_reservation_lock
);
3324 ret
= TCM_RESERVATION_CONFLICT
;
3328 * From spc4r17 section 5.7.8: registering and moving reservation
3330 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3331 * action is received and the established persistent reservation is a
3332 * Write Exclusive - All Registrants type or Exclusive Access -
3333 * All Registrants type reservation, then the command shall be completed
3334 * with RESERVATION CONFLICT status.
3336 if ((pr_res_holder
->pr_res_type
== PR_TYPE_WRITE_EXCLUSIVE_ALLREG
) ||
3337 (pr_res_holder
->pr_res_type
== PR_TYPE_EXCLUSIVE_ACCESS_ALLREG
)) {
3338 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
3339 " reservation for type: %s\n",
3340 core_scsi3_pr_dump_type(pr_res_holder
->pr_res_type
));
3341 spin_unlock(&dev
->dev_reservation_lock
);
3342 ret
= TCM_RESERVATION_CONFLICT
;
3345 pr_res_nacl
= pr_res_holder
->pr_reg_nacl
;
3347 * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3349 type
= pr_res_holder
->pr_res_type
;
3350 scope
= pr_res_holder
->pr_res_type
;
3352 * c) Associate the reservation key specified in the SERVICE ACTION
3353 * RESERVATION KEY field with the I_T nexus specified as the
3354 * destination of the register and move, where:
3355 * A) The I_T nexus is specified by the TransportID and the
3356 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3357 * B) Regardless of the TransportID format used, the association for
3358 * the initiator port is based on either the initiator port name
3359 * (see 3.1.71) on SCSI transport protocols where port names are
3360 * required or the initiator port identifier (see 3.1.70) on SCSI
3361 * transport protocols where port names are not required;
3362 * d) Register the reservation key specified in the SERVICE ACTION
3363 * RESERVATION KEY field;
3364 * e) Retain the reservation key specified in the SERVICE ACTION
3365 * RESERVATION KEY field and associated information;
3367 * Also, It is not an error for a REGISTER AND MOVE service action to
3368 * register an I_T nexus that is already registered with the same
3369 * reservation key or a different reservation key.
3371 dest_pr_reg
= __core_scsi3_locate_pr_reg(dev
, dest_node_acl
,
3374 if (core_scsi3_alloc_registration(cmd
->se_dev
,
3375 dest_node_acl
, dest_se_deve
, iport_ptr
,
3376 sa_res_key
, 0, aptpl
, 2, 1)) {
3377 spin_unlock(&dev
->dev_reservation_lock
);
3378 ret
= TCM_INVALID_PARAMETER_LIST
;
3381 dest_pr_reg
= __core_scsi3_locate_pr_reg(dev
, dest_node_acl
,
3386 * f) Release the persistent reservation for the persistent reservation
3387 * holder (i.e., the I_T nexus on which the
3389 __core_scsi3_complete_pro_release(dev
, pr_res_nacl
,
3390 dev
->dev_pr_res_holder
, 0);
3392 * g) Move the persistent reservation to the specified I_T nexus using
3393 * the same scope and type as the persistent reservation released in
3396 dev
->dev_pr_res_holder
= dest_pr_reg
;
3397 dest_pr_reg
->pr_res_holder
= 1;
3398 dest_pr_reg
->pr_res_type
= type
;
3399 pr_reg
->pr_res_scope
= scope
;
3400 core_pr_dump_initiator_port(pr_reg
, i_buf
, PR_REG_ISID_ID_LEN
);
3402 * Increment PRGeneration for existing registrations..
3405 dest_pr_reg
->pr_res_generation
= pr_tmpl
->pr_generation
++;
3406 spin_unlock(&dev
->dev_reservation_lock
);
3408 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
3409 " created new reservation holder TYPE: %s on object RTPI:"
3410 " %hu PRGeneration: 0x%08x\n", dest_tf_ops
->get_fabric_name(),
3411 core_scsi3_pr_dump_type(type
), rtpi
,
3412 dest_pr_reg
->pr_res_generation
);
3413 pr_debug("SPC-3 PR Successfully moved reservation from"
3414 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3415 tf_ops
->get_fabric_name(), pr_reg_nacl
->initiatorname
,
3416 i_buf
, dest_tf_ops
->get_fabric_name(),
3417 dest_node_acl
->initiatorname
, (iport_ptr
!= NULL
) ?
3420 * It is now safe to release configfs group dependencies for destination
3421 * of Transport ID Initiator Device/Port Identifier
3423 core_scsi3_lunacl_undepend_item(dest_se_deve
);
3424 core_scsi3_nodeacl_undepend_item(dest_node_acl
);
3425 core_scsi3_tpg_undepend_item(dest_se_tpg
);
3427 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3428 * nexus on which PERSISTENT RESERVE OUT command was received.
3431 spin_lock(&pr_tmpl
->registration_lock
);
3432 __core_scsi3_free_registration(dev
, pr_reg
, NULL
, 1);
3433 spin_unlock(&pr_tmpl
->registration_lock
);
3435 core_scsi3_put_pr_reg(pr_reg
);
3437 core_scsi3_update_and_write_aptpl(cmd
->se_dev
, aptpl
);
3439 transport_kunmap_data_sg(cmd
);
3441 core_scsi3_put_pr_reg(dest_pr_reg
);
3445 transport_kunmap_data_sg(cmd
);
3447 core_scsi3_lunacl_undepend_item(dest_se_deve
);
3449 core_scsi3_nodeacl_undepend_item(dest_node_acl
);
3450 core_scsi3_tpg_undepend_item(dest_se_tpg
);
3453 core_scsi3_put_pr_reg(pr_reg
);
3457 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb
)
3459 unsigned int __v1
, __v2
;
3461 __v1
= (cdb
[0] << 24) | (cdb
[1] << 16) | (cdb
[2] << 8) | cdb
[3];
3462 __v2
= (cdb
[4] << 24) | (cdb
[5] << 16) | (cdb
[6] << 8) | cdb
[7];
3464 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
3468 * See spc4r17 section 6.14 Table 170
3471 target_scsi3_emulate_pr_out(struct se_cmd
*cmd
)
3473 unsigned char *cdb
= &cmd
->t_task_cdb
[0];
3475 u64 res_key
, sa_res_key
;
3476 int sa
, scope
, type
, aptpl
;
3477 int spec_i_pt
= 0, all_tg_pt
= 0, unreg
= 0;
3481 * Following spc2r20 5.5.1 Reservations overview:
3483 * If a logical unit has been reserved by any RESERVE command and is
3484 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3485 * PERSISTENT RESERVE OUT commands shall conflict regardless of
3486 * initiator or service action and shall terminate with a RESERVATION
3489 if (cmd
->se_dev
->dev_reservation_flags
& DRF_SPC2_RESERVATIONS
) {
3490 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3491 " SPC-2 reservation is held, returning"
3492 " RESERVATION_CONFLICT\n");
3493 return TCM_RESERVATION_CONFLICT
;
3497 * FIXME: A NULL struct se_session pointer means an this is not coming from
3498 * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3501 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3503 if (cmd
->data_length
< 24) {
3504 pr_warn("SPC-PR: Received PR OUT parameter list"
3505 " length too small: %u\n", cmd
->data_length
);
3506 return TCM_INVALID_PARAMETER_LIST
;
3510 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3512 sa
= (cdb
[1] & 0x1f);
3513 scope
= (cdb
[2] & 0xf0);
3514 type
= (cdb
[2] & 0x0f);
3516 buf
= transport_kmap_data_sg(cmd
);
3518 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3521 * From PERSISTENT_RESERVE_OUT parameter list (payload)
3523 res_key
= core_scsi3_extract_reservation_key(&buf
[0]);
3524 sa_res_key
= core_scsi3_extract_reservation_key(&buf
[8]);
3526 * REGISTER_AND_MOVE uses a different SA parameter list containing
3527 * SCSI TransportIDs.
3529 if (sa
!= PRO_REGISTER_AND_MOVE
) {
3530 spec_i_pt
= (buf
[20] & 0x08);
3531 all_tg_pt
= (buf
[20] & 0x04);
3532 aptpl
= (buf
[20] & 0x01);
3534 aptpl
= (buf
[17] & 0x01);
3535 unreg
= (buf
[17] & 0x02);
3537 transport_kunmap_data_sg(cmd
);
3541 * SPEC_I_PT=1 is only valid for Service action: REGISTER
3543 if (spec_i_pt
&& ((cdb
[1] & 0x1f) != PRO_REGISTER
))
3544 return TCM_INVALID_PARAMETER_LIST
;
3547 * From spc4r17 section 6.14:
3549 * If the SPEC_I_PT bit is set to zero, the service action is not
3550 * REGISTER AND MOVE, and the parameter list length is not 24, then
3551 * the command shall be terminated with CHECK CONDITION status, with
3552 * the sense key set to ILLEGAL REQUEST, and the additional sense
3553 * code set to PARAMETER LIST LENGTH ERROR.
3555 if (!spec_i_pt
&& ((cdb
[1] & 0x1f) != PRO_REGISTER_AND_MOVE
) &&
3556 (cmd
->data_length
!= 24)) {
3557 pr_warn("SPC-PR: Received PR OUT illegal parameter"
3558 " list length: %u\n", cmd
->data_length
);
3559 return TCM_INVALID_PARAMETER_LIST
;
3563 * (core_scsi3_emulate_pro_* function parameters
3564 * are defined by spc4r17 Table 174:
3565 * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3569 ret
= core_scsi3_emulate_pro_register(cmd
,
3570 res_key
, sa_res_key
, aptpl
, all_tg_pt
, spec_i_pt
, REGISTER
);
3573 ret
= core_scsi3_emulate_pro_reserve(cmd
, type
, scope
, res_key
);
3576 ret
= core_scsi3_emulate_pro_release(cmd
, type
, scope
, res_key
);
3579 ret
= core_scsi3_emulate_pro_clear(cmd
, res_key
);
3582 ret
= core_scsi3_emulate_pro_preempt(cmd
, type
, scope
,
3583 res_key
, sa_res_key
, PREEMPT
);
3585 case PRO_PREEMPT_AND_ABORT
:
3586 ret
= core_scsi3_emulate_pro_preempt(cmd
, type
, scope
,
3587 res_key
, sa_res_key
, PREEMPT_AND_ABORT
);
3589 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY
:
3590 ret
= core_scsi3_emulate_pro_register(cmd
,
3591 0, sa_res_key
, aptpl
, all_tg_pt
, spec_i_pt
, REGISTER_AND_IGNORE_EXISTING_KEY
);
3593 case PRO_REGISTER_AND_MOVE
:
3594 ret
= core_scsi3_emulate_pro_register_and_move(cmd
, res_key
,
3595 sa_res_key
, aptpl
, unreg
);
3598 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
3599 " action: 0x%02x\n", cdb
[1] & 0x1f);
3600 return TCM_INVALID_CDB_FIELD
;
3604 target_complete_cmd(cmd
, GOOD
);
3609 * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3611 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3613 static sense_reason_t
3614 core_scsi3_pri_read_keys(struct se_cmd
*cmd
)
3616 struct se_device
*dev
= cmd
->se_dev
;
3617 struct t10_pr_registration
*pr_reg
;
3619 u32 add_len
= 0, off
= 8;
3621 if (cmd
->data_length
< 8) {
3622 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
3623 " too small\n", cmd
->data_length
);
3624 return TCM_INVALID_CDB_FIELD
;
3627 buf
= transport_kmap_data_sg(cmd
);
3629 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3631 buf
[0] = ((dev
->t10_pr
.pr_generation
>> 24) & 0xff);
3632 buf
[1] = ((dev
->t10_pr
.pr_generation
>> 16) & 0xff);
3633 buf
[2] = ((dev
->t10_pr
.pr_generation
>> 8) & 0xff);
3634 buf
[3] = (dev
->t10_pr
.pr_generation
& 0xff);
3636 spin_lock(&dev
->t10_pr
.registration_lock
);
3637 list_for_each_entry(pr_reg
, &dev
->t10_pr
.registration_list
,
3640 * Check for overflow of 8byte PRI READ_KEYS payload and
3641 * next reservation key list descriptor.
3643 if ((add_len
+ 8) > (cmd
->data_length
- 8))
3646 buf
[off
++] = ((pr_reg
->pr_res_key
>> 56) & 0xff);
3647 buf
[off
++] = ((pr_reg
->pr_res_key
>> 48) & 0xff);
3648 buf
[off
++] = ((pr_reg
->pr_res_key
>> 40) & 0xff);
3649 buf
[off
++] = ((pr_reg
->pr_res_key
>> 32) & 0xff);
3650 buf
[off
++] = ((pr_reg
->pr_res_key
>> 24) & 0xff);
3651 buf
[off
++] = ((pr_reg
->pr_res_key
>> 16) & 0xff);
3652 buf
[off
++] = ((pr_reg
->pr_res_key
>> 8) & 0xff);
3653 buf
[off
++] = (pr_reg
->pr_res_key
& 0xff);
3657 spin_unlock(&dev
->t10_pr
.registration_lock
);
3659 buf
[4] = ((add_len
>> 24) & 0xff);
3660 buf
[5] = ((add_len
>> 16) & 0xff);
3661 buf
[6] = ((add_len
>> 8) & 0xff);
3662 buf
[7] = (add_len
& 0xff);
3664 transport_kunmap_data_sg(cmd
);
3670 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3672 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3674 static sense_reason_t
3675 core_scsi3_pri_read_reservation(struct se_cmd
*cmd
)
3677 struct se_device
*dev
= cmd
->se_dev
;
3678 struct t10_pr_registration
*pr_reg
;
3681 u32 add_len
= 16; /* Hardcoded to 16 when a reservation is held. */
3683 if (cmd
->data_length
< 8) {
3684 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
3685 " too small\n", cmd
->data_length
);
3686 return TCM_INVALID_CDB_FIELD
;
3689 buf
= transport_kmap_data_sg(cmd
);
3691 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3693 buf
[0] = ((dev
->t10_pr
.pr_generation
>> 24) & 0xff);
3694 buf
[1] = ((dev
->t10_pr
.pr_generation
>> 16) & 0xff);
3695 buf
[2] = ((dev
->t10_pr
.pr_generation
>> 8) & 0xff);
3696 buf
[3] = (dev
->t10_pr
.pr_generation
& 0xff);
3698 spin_lock(&dev
->dev_reservation_lock
);
3699 pr_reg
= dev
->dev_pr_res_holder
;
3702 * Set the hardcoded Additional Length
3704 buf
[4] = ((add_len
>> 24) & 0xff);
3705 buf
[5] = ((add_len
>> 16) & 0xff);
3706 buf
[6] = ((add_len
>> 8) & 0xff);
3707 buf
[7] = (add_len
& 0xff);
3709 if (cmd
->data_length
< 22)
3713 * Set the Reservation key.
3715 * From spc4r17, section 5.7.10:
3716 * A persistent reservation holder has its reservation key
3717 * returned in the parameter data from a PERSISTENT
3718 * RESERVE IN command with READ RESERVATION service action as
3720 * a) For a persistent reservation of the type Write Exclusive
3721 * - All Registrants or Exclusive Access  All Regitrants,
3722 * the reservation key shall be set to zero; or
3723 * b) For all other persistent reservation types, the
3724 * reservation key shall be set to the registered
3725 * reservation key for the I_T nexus that holds the
3726 * persistent reservation.
3728 if ((pr_reg
->pr_res_type
== PR_TYPE_WRITE_EXCLUSIVE_ALLREG
) ||
3729 (pr_reg
->pr_res_type
== PR_TYPE_EXCLUSIVE_ACCESS_ALLREG
))
3732 pr_res_key
= pr_reg
->pr_res_key
;
3734 buf
[8] = ((pr_res_key
>> 56) & 0xff);
3735 buf
[9] = ((pr_res_key
>> 48) & 0xff);
3736 buf
[10] = ((pr_res_key
>> 40) & 0xff);
3737 buf
[11] = ((pr_res_key
>> 32) & 0xff);
3738 buf
[12] = ((pr_res_key
>> 24) & 0xff);
3739 buf
[13] = ((pr_res_key
>> 16) & 0xff);
3740 buf
[14] = ((pr_res_key
>> 8) & 0xff);
3741 buf
[15] = (pr_res_key
& 0xff);
3743 * Set the SCOPE and TYPE
3745 buf
[21] = (pr_reg
->pr_res_scope
& 0xf0) |
3746 (pr_reg
->pr_res_type
& 0x0f);
3750 spin_unlock(&dev
->dev_reservation_lock
);
3751 transport_kunmap_data_sg(cmd
);
3757 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3759 * See spc4r17 section 6.13.4 Table 165
3761 static sense_reason_t
3762 core_scsi3_pri_report_capabilities(struct se_cmd
*cmd
)
3764 struct se_device
*dev
= cmd
->se_dev
;
3765 struct t10_reservation
*pr_tmpl
= &dev
->t10_pr
;
3767 u16 add_len
= 8; /* Hardcoded to 8. */
3769 if (cmd
->data_length
< 6) {
3770 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
3771 " %u too small\n", cmd
->data_length
);
3772 return TCM_INVALID_CDB_FIELD
;
3775 buf
= transport_kmap_data_sg(cmd
);
3777 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3779 buf
[0] = ((add_len
>> 8) & 0xff);
3780 buf
[1] = (add_len
& 0xff);
3781 buf
[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
3782 buf
[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
3783 buf
[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
3784 buf
[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
3786 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
3787 * set the TMV: Task Mask Valid bit.
3791 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
3793 buf
[3] |= 0x10; /* ALLOW COMMANDs field 001b */
3795 * PTPL_A: Persistence across Target Power Loss Active bit
3797 if (pr_tmpl
->pr_aptpl_active
)
3800 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
3802 buf
[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3803 buf
[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
3804 buf
[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
3805 buf
[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
3806 buf
[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
3807 buf
[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3809 transport_kunmap_data_sg(cmd
);
3815 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
3817 * See spc4r17 section 6.13.5 Table 168 and 169
3819 static sense_reason_t
3820 core_scsi3_pri_read_full_status(struct se_cmd
*cmd
)
3822 struct se_device
*dev
= cmd
->se_dev
;
3823 struct se_node_acl
*se_nacl
;
3824 struct se_portal_group
*se_tpg
;
3825 struct t10_pr_registration
*pr_reg
, *pr_reg_tmp
;
3826 struct t10_reservation
*pr_tmpl
= &dev
->t10_pr
;
3828 u32 add_desc_len
= 0, add_len
= 0, desc_len
, exp_desc_len
;
3829 u32 off
= 8; /* off into first Full Status descriptor */
3830 int format_code
= 0;
3832 if (cmd
->data_length
< 8) {
3833 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
3834 " too small\n", cmd
->data_length
);
3835 return TCM_INVALID_CDB_FIELD
;
3838 buf
= transport_kmap_data_sg(cmd
);
3840 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3842 buf
[0] = ((dev
->t10_pr
.pr_generation
>> 24) & 0xff);
3843 buf
[1] = ((dev
->t10_pr
.pr_generation
>> 16) & 0xff);
3844 buf
[2] = ((dev
->t10_pr
.pr_generation
>> 8) & 0xff);
3845 buf
[3] = (dev
->t10_pr
.pr_generation
& 0xff);
3847 spin_lock(&pr_tmpl
->registration_lock
);
3848 list_for_each_entry_safe(pr_reg
, pr_reg_tmp
,
3849 &pr_tmpl
->registration_list
, pr_reg_list
) {
3851 se_nacl
= pr_reg
->pr_reg_nacl
;
3852 se_tpg
= pr_reg
->pr_reg_nacl
->se_tpg
;
3855 atomic_inc_mb(&pr_reg
->pr_res_holders
);
3856 spin_unlock(&pr_tmpl
->registration_lock
);
3858 * Determine expected length of $FABRIC_MOD specific
3859 * TransportID full status descriptor..
3861 exp_desc_len
= se_tpg
->se_tpg_tfo
->tpg_get_pr_transport_id_len(
3862 se_tpg
, se_nacl
, pr_reg
, &format_code
);
3864 if ((exp_desc_len
+ add_len
) > cmd
->data_length
) {
3865 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
3866 " out of buffer: %d\n", cmd
->data_length
);
3867 spin_lock(&pr_tmpl
->registration_lock
);
3868 atomic_dec_mb(&pr_reg
->pr_res_holders
);
3872 * Set RESERVATION KEY
3874 buf
[off
++] = ((pr_reg
->pr_res_key
>> 56) & 0xff);
3875 buf
[off
++] = ((pr_reg
->pr_res_key
>> 48) & 0xff);
3876 buf
[off
++] = ((pr_reg
->pr_res_key
>> 40) & 0xff);
3877 buf
[off
++] = ((pr_reg
->pr_res_key
>> 32) & 0xff);
3878 buf
[off
++] = ((pr_reg
->pr_res_key
>> 24) & 0xff);
3879 buf
[off
++] = ((pr_reg
->pr_res_key
>> 16) & 0xff);
3880 buf
[off
++] = ((pr_reg
->pr_res_key
>> 8) & 0xff);
3881 buf
[off
++] = (pr_reg
->pr_res_key
& 0xff);
3882 off
+= 4; /* Skip Over Reserved area */
3885 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
3887 if (pr_reg
->pr_reg_all_tg_pt
)
3890 * The struct se_lun pointer will be present for the
3891 * reservation holder for PR_HOLDER bit.
3893 * Also, if this registration is the reservation
3894 * holder, fill in SCOPE and TYPE in the next byte.
3896 if (pr_reg
->pr_res_holder
) {
3898 buf
[off
++] = (pr_reg
->pr_res_scope
& 0xf0) |
3899 (pr_reg
->pr_res_type
& 0x0f);
3903 off
+= 4; /* Skip over reserved area */
3905 * From spc4r17 6.3.15:
3907 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
3908 * IDENTIFIER field contains the relative port identifier (see
3909 * 3.1.120) of the target port that is part of the I_T nexus
3910 * described by this full status descriptor. If the ALL_TG_PT
3911 * bit is set to one, the contents of the RELATIVE TARGET PORT
3912 * IDENTIFIER field are not defined by this standard.
3914 if (!pr_reg
->pr_reg_all_tg_pt
) {
3915 struct se_port
*port
= pr_reg
->pr_reg_tg_pt_lun
->lun_sep
;
3917 buf
[off
++] = ((port
->sep_rtpi
>> 8) & 0xff);
3918 buf
[off
++] = (port
->sep_rtpi
& 0xff);
3920 off
+= 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
3923 * Now, have the $FABRIC_MOD fill in the protocol identifier
3925 desc_len
= se_tpg
->se_tpg_tfo
->tpg_get_pr_transport_id(se_tpg
,
3926 se_nacl
, pr_reg
, &format_code
, &buf
[off
+4]);
3928 spin_lock(&pr_tmpl
->registration_lock
);
3929 atomic_dec_mb(&pr_reg
->pr_res_holders
);
3931 * Set the ADDITIONAL DESCRIPTOR LENGTH
3933 buf
[off
++] = ((desc_len
>> 24) & 0xff);
3934 buf
[off
++] = ((desc_len
>> 16) & 0xff);
3935 buf
[off
++] = ((desc_len
>> 8) & 0xff);
3936 buf
[off
++] = (desc_len
& 0xff);
3938 * Size of full desctipor header minus TransportID
3939 * containing $FABRIC_MOD specific) initiator device/port
3942 * See spc4r17 Section 6.13.5 Table 169
3944 add_desc_len
= (24 + desc_len
);
3947 add_len
+= add_desc_len
;
3949 spin_unlock(&pr_tmpl
->registration_lock
);
3951 * Set ADDITIONAL_LENGTH
3953 buf
[4] = ((add_len
>> 24) & 0xff);
3954 buf
[5] = ((add_len
>> 16) & 0xff);
3955 buf
[6] = ((add_len
>> 8) & 0xff);
3956 buf
[7] = (add_len
& 0xff);
3958 transport_kunmap_data_sg(cmd
);
3964 target_scsi3_emulate_pr_in(struct se_cmd
*cmd
)
3969 * Following spc2r20 5.5.1 Reservations overview:
3971 * If a logical unit has been reserved by any RESERVE command and is
3972 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3973 * PERSISTENT RESERVE OUT commands shall conflict regardless of
3974 * initiator or service action and shall terminate with a RESERVATION
3977 if (cmd
->se_dev
->dev_reservation_flags
& DRF_SPC2_RESERVATIONS
) {
3978 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3979 " SPC-2 reservation is held, returning"
3980 " RESERVATION_CONFLICT\n");
3981 return TCM_RESERVATION_CONFLICT
;
3984 switch (cmd
->t_task_cdb
[1] & 0x1f) {
3986 ret
= core_scsi3_pri_read_keys(cmd
);
3988 case PRI_READ_RESERVATION
:
3989 ret
= core_scsi3_pri_read_reservation(cmd
);
3991 case PRI_REPORT_CAPABILITIES
:
3992 ret
= core_scsi3_pri_report_capabilities(cmd
);
3994 case PRI_READ_FULL_STATUS
:
3995 ret
= core_scsi3_pri_read_full_status(cmd
);
3998 pr_err("Unknown PERSISTENT_RESERVE_IN service"
3999 " action: 0x%02x\n", cmd
->t_task_cdb
[1] & 0x1f);
4000 return TCM_INVALID_CDB_FIELD
;
4004 target_complete_cmd(cmd
, GOOD
);
4009 target_check_reservation(struct se_cmd
*cmd
)
4011 struct se_device
*dev
= cmd
->se_dev
;
4016 if (dev
->se_hba
->hba_flags
& HBA_FLAGS_INTERNAL_USE
)
4018 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)
4021 spin_lock(&dev
->dev_reservation_lock
);
4022 if (dev
->dev_reservation_flags
& DRF_SPC2_RESERVATIONS
)
4023 ret
= target_scsi2_reservation_check(cmd
);
4025 ret
= target_scsi3_pr_reservation_check(cmd
);
4026 spin_unlock(&dev
->dev_reservation_lock
);