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 2009-2012 RisingTide Systems LLC.
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 explict 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 implict 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 implict 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 pr_reg
->pr_aptpl_buf
= kzalloc(dev
->t10_pr
.pr_aptpl_buf_len
,
611 if (!pr_reg
->pr_aptpl_buf
) {
612 pr_err("Unable to allocate pr_reg->pr_aptpl_buf\n");
613 kmem_cache_free(t10_pr_reg_cache
, pr_reg
);
617 INIT_LIST_HEAD(&pr_reg
->pr_reg_list
);
618 INIT_LIST_HEAD(&pr_reg
->pr_reg_abort_list
);
619 INIT_LIST_HEAD(&pr_reg
->pr_reg_aptpl_list
);
620 INIT_LIST_HEAD(&pr_reg
->pr_reg_atp_list
);
621 INIT_LIST_HEAD(&pr_reg
->pr_reg_atp_mem_list
);
622 atomic_set(&pr_reg
->pr_res_holders
, 0);
623 pr_reg
->pr_reg_nacl
= nacl
;
624 pr_reg
->pr_reg_deve
= deve
;
625 pr_reg
->pr_res_mapped_lun
= deve
->mapped_lun
;
626 pr_reg
->pr_aptpl_target_lun
= deve
->se_lun
->unpacked_lun
;
627 pr_reg
->pr_res_key
= sa_res_key
;
628 pr_reg
->pr_reg_all_tg_pt
= all_tg_pt
;
629 pr_reg
->pr_reg_aptpl
= aptpl
;
630 pr_reg
->pr_reg_tg_pt_lun
= deve
->se_lun
;
632 * If an ISID value for this SCSI Initiator Port exists,
633 * save it to the registration now.
636 pr_reg
->pr_reg_bin_isid
= get_unaligned_be64(isid
);
637 snprintf(pr_reg
->pr_reg_isid
, PR_REG_ISID_LEN
, "%s", isid
);
638 pr_reg
->isid_present_at_reg
= 1;
644 static int core_scsi3_lunacl_depend_item(struct se_dev_entry
*);
645 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry
*);
648 * Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
651 static struct t10_pr_registration
*__core_scsi3_alloc_registration(
652 struct se_device
*dev
,
653 struct se_node_acl
*nacl
,
654 struct se_dev_entry
*deve
,
660 struct se_dev_entry
*deve_tmp
;
661 struct se_node_acl
*nacl_tmp
;
662 struct se_port
*port
, *port_tmp
;
663 struct target_core_fabric_ops
*tfo
= nacl
->se_tpg
->se_tpg_tfo
;
664 struct t10_pr_registration
*pr_reg
, *pr_reg_atp
, *pr_reg_tmp
, *pr_reg_tmp_safe
;
667 * Create a registration for the I_T Nexus upon which the
668 * PROUT REGISTER was received.
670 pr_reg
= __core_scsi3_do_alloc_registration(dev
, nacl
, deve
, isid
,
671 sa_res_key
, all_tg_pt
, aptpl
);
675 * Return pointer to pr_reg for ALL_TG_PT=0
680 * Create list of matching SCSI Initiator Port registrations
683 spin_lock(&dev
->se_port_lock
);
684 list_for_each_entry_safe(port
, port_tmp
, &dev
->dev_sep_list
, sep_list
) {
685 atomic_inc(&port
->sep_tg_pt_ref_cnt
);
686 smp_mb__after_atomic_inc();
687 spin_unlock(&dev
->se_port_lock
);
689 spin_lock_bh(&port
->sep_alua_lock
);
690 list_for_each_entry(deve_tmp
, &port
->sep_alua_list
,
693 * This pointer will be NULL for demo mode MappedLUNs
694 * that have not been make explict via a ConfigFS
695 * MappedLUN group for the SCSI Initiator Node ACL.
697 if (!deve_tmp
->se_lun_acl
)
700 nacl_tmp
= deve_tmp
->se_lun_acl
->se_lun_nacl
;
702 * Skip the matching struct se_node_acl that is allocated
705 if (nacl
== nacl_tmp
)
708 * Only perform PR registrations for target ports on
709 * the same fabric module as the REGISTER w/ ALL_TG_PT=1
712 if (tfo
!= nacl_tmp
->se_tpg
->se_tpg_tfo
)
715 * Look for a matching Initiator Node ACL in ASCII format
717 if (strcmp(nacl
->initiatorname
, nacl_tmp
->initiatorname
))
720 atomic_inc(&deve_tmp
->pr_ref_count
);
721 smp_mb__after_atomic_inc();
722 spin_unlock_bh(&port
->sep_alua_lock
);
724 * Grab a configfs group dependency that is released
725 * for the exception path at label out: below, or upon
726 * completion of adding ALL_TG_PT=1 registrations in
727 * __core_scsi3_add_registration()
729 ret
= core_scsi3_lunacl_depend_item(deve_tmp
);
731 pr_err("core_scsi3_lunacl_depend"
733 atomic_dec(&port
->sep_tg_pt_ref_cnt
);
734 smp_mb__after_atomic_dec();
735 atomic_dec(&deve_tmp
->pr_ref_count
);
736 smp_mb__after_atomic_dec();
740 * Located a matching SCSI Initiator Port on a different
741 * port, allocate the pr_reg_atp and attach it to the
742 * pr_reg->pr_reg_atp_list that will be processed once
743 * the original *pr_reg is processed in
744 * __core_scsi3_add_registration()
746 pr_reg_atp
= __core_scsi3_do_alloc_registration(dev
,
747 nacl_tmp
, deve_tmp
, NULL
,
748 sa_res_key
, all_tg_pt
, aptpl
);
750 atomic_dec(&port
->sep_tg_pt_ref_cnt
);
751 smp_mb__after_atomic_dec();
752 atomic_dec(&deve_tmp
->pr_ref_count
);
753 smp_mb__after_atomic_dec();
754 core_scsi3_lunacl_undepend_item(deve_tmp
);
758 list_add_tail(&pr_reg_atp
->pr_reg_atp_mem_list
,
759 &pr_reg
->pr_reg_atp_list
);
760 spin_lock_bh(&port
->sep_alua_lock
);
762 spin_unlock_bh(&port
->sep_alua_lock
);
764 spin_lock(&dev
->se_port_lock
);
765 atomic_dec(&port
->sep_tg_pt_ref_cnt
);
766 smp_mb__after_atomic_dec();
768 spin_unlock(&dev
->se_port_lock
);
772 list_for_each_entry_safe(pr_reg_tmp
, pr_reg_tmp_safe
,
773 &pr_reg
->pr_reg_atp_list
, pr_reg_atp_mem_list
) {
774 list_del(&pr_reg_tmp
->pr_reg_atp_mem_list
);
775 core_scsi3_lunacl_undepend_item(pr_reg_tmp
->pr_reg_deve
);
776 kmem_cache_free(t10_pr_reg_cache
, pr_reg_tmp
);
778 kmem_cache_free(t10_pr_reg_cache
, pr_reg
);
782 int core_scsi3_alloc_aptpl_registration(
783 struct t10_reservation
*pr_tmpl
,
785 unsigned char *i_port
,
788 unsigned char *t_port
,
795 struct t10_pr_registration
*pr_reg
;
797 if (!i_port
|| !t_port
|| !sa_res_key
) {
798 pr_err("Illegal parameters for APTPL registration\n");
802 pr_reg
= kmem_cache_zalloc(t10_pr_reg_cache
, GFP_KERNEL
);
804 pr_err("Unable to allocate struct t10_pr_registration\n");
807 pr_reg
->pr_aptpl_buf
= kzalloc(pr_tmpl
->pr_aptpl_buf_len
, GFP_KERNEL
);
809 INIT_LIST_HEAD(&pr_reg
->pr_reg_list
);
810 INIT_LIST_HEAD(&pr_reg
->pr_reg_abort_list
);
811 INIT_LIST_HEAD(&pr_reg
->pr_reg_aptpl_list
);
812 INIT_LIST_HEAD(&pr_reg
->pr_reg_atp_list
);
813 INIT_LIST_HEAD(&pr_reg
->pr_reg_atp_mem_list
);
814 atomic_set(&pr_reg
->pr_res_holders
, 0);
815 pr_reg
->pr_reg_nacl
= NULL
;
816 pr_reg
->pr_reg_deve
= NULL
;
817 pr_reg
->pr_res_mapped_lun
= mapped_lun
;
818 pr_reg
->pr_aptpl_target_lun
= target_lun
;
819 pr_reg
->pr_res_key
= sa_res_key
;
820 pr_reg
->pr_reg_all_tg_pt
= all_tg_pt
;
821 pr_reg
->pr_reg_aptpl
= 1;
822 pr_reg
->pr_reg_tg_pt_lun
= NULL
;
823 pr_reg
->pr_res_scope
= 0; /* Always LUN_SCOPE */
824 pr_reg
->pr_res_type
= type
;
826 * If an ISID value had been saved in APTPL metadata for this
827 * SCSI Initiator Port, restore it now.
830 pr_reg
->pr_reg_bin_isid
= get_unaligned_be64(isid
);
831 snprintf(pr_reg
->pr_reg_isid
, PR_REG_ISID_LEN
, "%s", isid
);
832 pr_reg
->isid_present_at_reg
= 1;
835 * Copy the i_port and t_port information from caller.
837 snprintf(pr_reg
->pr_iport
, PR_APTPL_MAX_IPORT_LEN
, "%s", i_port
);
838 snprintf(pr_reg
->pr_tport
, PR_APTPL_MAX_TPORT_LEN
, "%s", t_port
);
839 pr_reg
->pr_reg_tpgt
= tpgt
;
841 * Set pr_res_holder from caller, the pr_reg who is the reservation
842 * holder will get it's pointer set in core_scsi3_aptpl_reserve() once
843 * the Initiator Node LUN ACL from the fabric module is created for
846 pr_reg
->pr_res_holder
= res_holder
;
848 list_add_tail(&pr_reg
->pr_reg_aptpl_list
, &pr_tmpl
->aptpl_reg_list
);
849 pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
850 " metadata\n", (res_holder
) ? "+reservation" : "");
854 static void core_scsi3_aptpl_reserve(
855 struct se_device
*dev
,
856 struct se_portal_group
*tpg
,
857 struct se_node_acl
*node_acl
,
858 struct t10_pr_registration
*pr_reg
)
860 char i_buf
[PR_REG_ISID_ID_LEN
];
862 memset(i_buf
, 0, PR_REG_ISID_ID_LEN
);
863 core_pr_dump_initiator_port(pr_reg
, i_buf
, PR_REG_ISID_ID_LEN
);
865 spin_lock(&dev
->dev_reservation_lock
);
866 dev
->dev_pr_res_holder
= pr_reg
;
867 spin_unlock(&dev
->dev_reservation_lock
);
869 pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
870 " new reservation holder TYPE: %s ALL_TG_PT: %d\n",
871 tpg
->se_tpg_tfo
->get_fabric_name(),
872 core_scsi3_pr_dump_type(pr_reg
->pr_res_type
),
873 (pr_reg
->pr_reg_all_tg_pt
) ? 1 : 0);
874 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
875 tpg
->se_tpg_tfo
->get_fabric_name(), node_acl
->initiatorname
,
879 static void __core_scsi3_add_registration(struct se_device
*, struct se_node_acl
*,
880 struct t10_pr_registration
*, enum register_type
, int);
882 static int __core_scsi3_check_aptpl_registration(
883 struct se_device
*dev
,
884 struct se_portal_group
*tpg
,
887 struct se_node_acl
*nacl
,
888 struct se_dev_entry
*deve
)
890 struct t10_pr_registration
*pr_reg
, *pr_reg_tmp
;
891 struct t10_reservation
*pr_tmpl
= &dev
->t10_pr
;
892 unsigned char i_port
[PR_APTPL_MAX_IPORT_LEN
];
893 unsigned char t_port
[PR_APTPL_MAX_TPORT_LEN
];
896 memset(i_port
, 0, PR_APTPL_MAX_IPORT_LEN
);
897 memset(t_port
, 0, PR_APTPL_MAX_TPORT_LEN
);
899 * Copy Initiator Port information from struct se_node_acl
901 snprintf(i_port
, PR_APTPL_MAX_IPORT_LEN
, "%s", nacl
->initiatorname
);
902 snprintf(t_port
, PR_APTPL_MAX_TPORT_LEN
, "%s",
903 tpg
->se_tpg_tfo
->tpg_get_wwn(tpg
));
904 tpgt
= tpg
->se_tpg_tfo
->tpg_get_tag(tpg
);
906 * Look for the matching registrations+reservation from those
907 * created from APTPL metadata. Note that multiple registrations
908 * may exist for fabrics that use ISIDs in their SCSI Initiator Port
911 spin_lock(&pr_tmpl
->aptpl_reg_lock
);
912 list_for_each_entry_safe(pr_reg
, pr_reg_tmp
, &pr_tmpl
->aptpl_reg_list
,
914 if (!strcmp(pr_reg
->pr_iport
, i_port
) &&
915 (pr_reg
->pr_res_mapped_lun
== deve
->mapped_lun
) &&
916 !(strcmp(pr_reg
->pr_tport
, t_port
)) &&
917 (pr_reg
->pr_reg_tpgt
== tpgt
) &&
918 (pr_reg
->pr_aptpl_target_lun
== target_lun
)) {
920 pr_reg
->pr_reg_nacl
= nacl
;
921 pr_reg
->pr_reg_deve
= deve
;
922 pr_reg
->pr_reg_tg_pt_lun
= lun
;
924 list_del(&pr_reg
->pr_reg_aptpl_list
);
925 spin_unlock(&pr_tmpl
->aptpl_reg_lock
);
927 * At this point all of the pointers in *pr_reg will
928 * be setup, so go ahead and add the registration.
931 __core_scsi3_add_registration(dev
, nacl
, pr_reg
, 0, 0);
933 * If this registration is the reservation holder,
934 * make that happen now..
936 if (pr_reg
->pr_res_holder
)
937 core_scsi3_aptpl_reserve(dev
, tpg
,
940 * Reenable pr_aptpl_active to accept new metadata
941 * updates once the SCSI device is active again..
943 spin_lock(&pr_tmpl
->aptpl_reg_lock
);
944 pr_tmpl
->pr_aptpl_active
= 1;
947 spin_unlock(&pr_tmpl
->aptpl_reg_lock
);
952 int core_scsi3_check_aptpl_registration(
953 struct se_device
*dev
,
954 struct se_portal_group
*tpg
,
956 struct se_lun_acl
*lun_acl
)
958 struct se_node_acl
*nacl
= lun_acl
->se_lun_nacl
;
959 struct se_dev_entry
*deve
= nacl
->device_list
[lun_acl
->mapped_lun
];
961 if (dev
->dev_reservation_flags
& DRF_SPC2_RESERVATIONS
)
964 return __core_scsi3_check_aptpl_registration(dev
, tpg
, lun
,
965 lun
->unpacked_lun
, nacl
, deve
);
968 static void __core_scsi3_dump_registration(
969 struct target_core_fabric_ops
*tfo
,
970 struct se_device
*dev
,
971 struct se_node_acl
*nacl
,
972 struct t10_pr_registration
*pr_reg
,
973 enum register_type register_type
)
975 struct se_portal_group
*se_tpg
= nacl
->se_tpg
;
976 char i_buf
[PR_REG_ISID_ID_LEN
];
978 memset(&i_buf
[0], 0, PR_REG_ISID_ID_LEN
);
979 core_pr_dump_initiator_port(pr_reg
, i_buf
, PR_REG_ISID_ID_LEN
);
981 pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
982 " Node: %s%s\n", tfo
->get_fabric_name(), (register_type
== REGISTER_AND_MOVE
) ?
983 "_AND_MOVE" : (register_type
== REGISTER_AND_IGNORE_EXISTING_KEY
) ?
984 "_AND_IGNORE_EXISTING_KEY" : "", nacl
->initiatorname
,
986 pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
987 tfo
->get_fabric_name(), tfo
->tpg_get_wwn(se_tpg
),
988 tfo
->tpg_get_tag(se_tpg
));
989 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
990 " Port(s)\n", tfo
->get_fabric_name(),
991 (pr_reg
->pr_reg_all_tg_pt
) ? "ALL" : "SINGLE",
992 dev
->transport
->name
);
993 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
994 " 0x%08x APTPL: %d\n", tfo
->get_fabric_name(),
995 pr_reg
->pr_res_key
, pr_reg
->pr_res_generation
,
996 pr_reg
->pr_reg_aptpl
);
1000 * this function can be called with struct se_device->dev_reservation_lock
1001 * when register_move = 1
1003 static void __core_scsi3_add_registration(
1004 struct se_device
*dev
,
1005 struct se_node_acl
*nacl
,
1006 struct t10_pr_registration
*pr_reg
,
1007 enum register_type register_type
,
1010 struct target_core_fabric_ops
*tfo
= nacl
->se_tpg
->se_tpg_tfo
;
1011 struct t10_pr_registration
*pr_reg_tmp
, *pr_reg_tmp_safe
;
1012 struct t10_reservation
*pr_tmpl
= &dev
->t10_pr
;
1015 * Increment PRgeneration counter for struct se_device upon a successful
1016 * REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
1018 * Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
1019 * action, the struct se_device->dev_reservation_lock will already be held,
1020 * so we do not call core_scsi3_pr_generation() which grabs the lock
1023 pr_reg
->pr_res_generation
= (register_move
) ?
1024 dev
->t10_pr
.pr_generation
++ :
1025 core_scsi3_pr_generation(dev
);
1027 spin_lock(&pr_tmpl
->registration_lock
);
1028 list_add_tail(&pr_reg
->pr_reg_list
, &pr_tmpl
->registration_list
);
1029 pr_reg
->pr_reg_deve
->def_pr_registered
= 1;
1031 __core_scsi3_dump_registration(tfo
, dev
, nacl
, pr_reg
, register_type
);
1032 spin_unlock(&pr_tmpl
->registration_lock
);
1034 * Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
1036 if (!pr_reg
->pr_reg_all_tg_pt
|| register_move
)
1039 * Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
1040 * allocated in __core_scsi3_alloc_registration()
1042 list_for_each_entry_safe(pr_reg_tmp
, pr_reg_tmp_safe
,
1043 &pr_reg
->pr_reg_atp_list
, pr_reg_atp_mem_list
) {
1044 list_del(&pr_reg_tmp
->pr_reg_atp_mem_list
);
1046 pr_reg_tmp
->pr_res_generation
= core_scsi3_pr_generation(dev
);
1048 spin_lock(&pr_tmpl
->registration_lock
);
1049 list_add_tail(&pr_reg_tmp
->pr_reg_list
,
1050 &pr_tmpl
->registration_list
);
1051 pr_reg_tmp
->pr_reg_deve
->def_pr_registered
= 1;
1053 __core_scsi3_dump_registration(tfo
, dev
,
1054 pr_reg_tmp
->pr_reg_nacl
, pr_reg_tmp
,
1056 spin_unlock(&pr_tmpl
->registration_lock
);
1058 * Drop configfs group dependency reference from
1059 * __core_scsi3_alloc_registration()
1061 core_scsi3_lunacl_undepend_item(pr_reg_tmp
->pr_reg_deve
);
1065 static int core_scsi3_alloc_registration(
1066 struct se_device
*dev
,
1067 struct se_node_acl
*nacl
,
1068 struct se_dev_entry
*deve
,
1069 unsigned char *isid
,
1073 enum register_type register_type
,
1076 struct t10_pr_registration
*pr_reg
;
1078 pr_reg
= __core_scsi3_alloc_registration(dev
, nacl
, deve
, isid
,
1079 sa_res_key
, all_tg_pt
, aptpl
);
1083 __core_scsi3_add_registration(dev
, nacl
, pr_reg
,
1084 register_type
, register_move
);
1088 static struct t10_pr_registration
*__core_scsi3_locate_pr_reg(
1089 struct se_device
*dev
,
1090 struct se_node_acl
*nacl
,
1091 unsigned char *isid
)
1093 struct t10_reservation
*pr_tmpl
= &dev
->t10_pr
;
1094 struct t10_pr_registration
*pr_reg
, *pr_reg_tmp
;
1095 struct se_portal_group
*tpg
;
1097 spin_lock(&pr_tmpl
->registration_lock
);
1098 list_for_each_entry_safe(pr_reg
, pr_reg_tmp
,
1099 &pr_tmpl
->registration_list
, pr_reg_list
) {
1101 * First look for a matching struct se_node_acl
1103 if (pr_reg
->pr_reg_nacl
!= nacl
)
1106 tpg
= pr_reg
->pr_reg_nacl
->se_tpg
;
1108 * If this registration does NOT contain a fabric provided
1109 * ISID, then we have found a match.
1111 if (!pr_reg
->isid_present_at_reg
) {
1113 * Determine if this SCSI device server requires that
1114 * SCSI Intiatior TransportID w/ ISIDs is enforced
1115 * for fabric modules (iSCSI) requiring them.
1117 if (tpg
->se_tpg_tfo
->sess_get_initiator_sid
!= NULL
) {
1118 if (dev
->dev_attrib
.enforce_pr_isids
)
1121 atomic_inc(&pr_reg
->pr_res_holders
);
1122 smp_mb__after_atomic_inc();
1123 spin_unlock(&pr_tmpl
->registration_lock
);
1127 * If the *pr_reg contains a fabric defined ISID for multi-value
1128 * SCSI Initiator Port TransportIDs, then we expect a valid
1129 * matching ISID to be provided by the local SCSI Initiator Port.
1133 if (strcmp(isid
, pr_reg
->pr_reg_isid
))
1136 atomic_inc(&pr_reg
->pr_res_holders
);
1137 smp_mb__after_atomic_inc();
1138 spin_unlock(&pr_tmpl
->registration_lock
);
1141 spin_unlock(&pr_tmpl
->registration_lock
);
1146 static struct t10_pr_registration
*core_scsi3_locate_pr_reg(
1147 struct se_device
*dev
,
1148 struct se_node_acl
*nacl
,
1149 struct se_session
*sess
)
1151 struct se_portal_group
*tpg
= nacl
->se_tpg
;
1152 unsigned char buf
[PR_REG_ISID_LEN
], *isid_ptr
= NULL
;
1154 if (tpg
->se_tpg_tfo
->sess_get_initiator_sid
!= NULL
) {
1155 memset(&buf
[0], 0, PR_REG_ISID_LEN
);
1156 tpg
->se_tpg_tfo
->sess_get_initiator_sid(sess
, &buf
[0],
1161 return __core_scsi3_locate_pr_reg(dev
, nacl
, isid_ptr
);
1164 static void core_scsi3_put_pr_reg(struct t10_pr_registration
*pr_reg
)
1166 atomic_dec(&pr_reg
->pr_res_holders
);
1167 smp_mb__after_atomic_dec();
1170 static int core_scsi3_check_implict_release(
1171 struct se_device
*dev
,
1172 struct t10_pr_registration
*pr_reg
)
1174 struct se_node_acl
*nacl
= pr_reg
->pr_reg_nacl
;
1175 struct t10_pr_registration
*pr_res_holder
;
1178 spin_lock(&dev
->dev_reservation_lock
);
1179 pr_res_holder
= dev
->dev_pr_res_holder
;
1180 if (!pr_res_holder
) {
1181 spin_unlock(&dev
->dev_reservation_lock
);
1184 if (pr_res_holder
== pr_reg
) {
1186 * Perform an implict RELEASE if the registration that
1187 * is being released is holding the reservation.
1189 * From spc4r17, section 5.7.11.1:
1191 * e) If the I_T nexus is the persistent reservation holder
1192 * and the persistent reservation is not an all registrants
1193 * type, then a PERSISTENT RESERVE OUT command with REGISTER
1194 * service action or REGISTER AND IGNORE EXISTING KEY
1195 * service action with the SERVICE ACTION RESERVATION KEY
1196 * field set to zero (see 5.7.11.3).
1198 __core_scsi3_complete_pro_release(dev
, nacl
, pr_reg
, 0);
1201 * For 'All Registrants' reservation types, all existing
1202 * registrations are still processed as reservation holders
1203 * in core_scsi3_pr_seq_non_holder() after the initial
1204 * reservation holder is implictly released here.
1206 } else if (pr_reg
->pr_reg_all_tg_pt
&&
1207 (!strcmp(pr_res_holder
->pr_reg_nacl
->initiatorname
,
1208 pr_reg
->pr_reg_nacl
->initiatorname
)) &&
1209 (pr_res_holder
->pr_res_key
== pr_reg
->pr_res_key
)) {
1210 pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
1211 " UNREGISTER while existing reservation with matching"
1212 " key 0x%016Lx is present from another SCSI Initiator"
1213 " Port\n", pr_reg
->pr_res_key
);
1216 spin_unlock(&dev
->dev_reservation_lock
);
1222 * Called with struct t10_reservation->registration_lock held.
1224 static void __core_scsi3_free_registration(
1225 struct se_device
*dev
,
1226 struct t10_pr_registration
*pr_reg
,
1227 struct list_head
*preempt_and_abort_list
,
1230 struct target_core_fabric_ops
*tfo
=
1231 pr_reg
->pr_reg_nacl
->se_tpg
->se_tpg_tfo
;
1232 struct t10_reservation
*pr_tmpl
= &dev
->t10_pr
;
1233 char i_buf
[PR_REG_ISID_ID_LEN
];
1235 memset(i_buf
, 0, PR_REG_ISID_ID_LEN
);
1236 core_pr_dump_initiator_port(pr_reg
, i_buf
, PR_REG_ISID_ID_LEN
);
1238 pr_reg
->pr_reg_deve
->def_pr_registered
= 0;
1239 pr_reg
->pr_reg_deve
->pr_res_key
= 0;
1240 list_del(&pr_reg
->pr_reg_list
);
1242 * Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
1243 * so call core_scsi3_put_pr_reg() to decrement our reference.
1246 core_scsi3_put_pr_reg(pr_reg
);
1248 * Wait until all reference from any other I_T nexuses for this
1249 * *pr_reg have been released. Because list_del() is called above,
1250 * the last core_scsi3_put_pr_reg(pr_reg) will release this reference
1251 * count back to zero, and we release *pr_reg.
1253 while (atomic_read(&pr_reg
->pr_res_holders
) != 0) {
1254 spin_unlock(&pr_tmpl
->registration_lock
);
1255 pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
1256 tfo
->get_fabric_name());
1258 spin_lock(&pr_tmpl
->registration_lock
);
1261 pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
1262 " Node: %s%s\n", tfo
->get_fabric_name(),
1263 pr_reg
->pr_reg_nacl
->initiatorname
,
1265 pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
1266 " Port(s)\n", tfo
->get_fabric_name(),
1267 (pr_reg
->pr_reg_all_tg_pt
) ? "ALL" : "SINGLE",
1268 dev
->transport
->name
);
1269 pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
1270 " 0x%08x\n", tfo
->get_fabric_name(), pr_reg
->pr_res_key
,
1271 pr_reg
->pr_res_generation
);
1273 if (!preempt_and_abort_list
) {
1274 pr_reg
->pr_reg_deve
= NULL
;
1275 pr_reg
->pr_reg_nacl
= NULL
;
1276 kfree(pr_reg
->pr_aptpl_buf
);
1277 kmem_cache_free(t10_pr_reg_cache
, pr_reg
);
1281 * For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
1282 * are released once the ABORT_TASK_SET has completed..
1284 list_add_tail(&pr_reg
->pr_reg_abort_list
, preempt_and_abort_list
);
1287 void core_scsi3_free_pr_reg_from_nacl(
1288 struct se_device
*dev
,
1289 struct se_node_acl
*nacl
)
1291 struct t10_reservation
*pr_tmpl
= &dev
->t10_pr
;
1292 struct t10_pr_registration
*pr_reg
, *pr_reg_tmp
, *pr_res_holder
;
1294 * If the passed se_node_acl matches the reservation holder,
1295 * release the reservation.
1297 spin_lock(&dev
->dev_reservation_lock
);
1298 pr_res_holder
= dev
->dev_pr_res_holder
;
1299 if ((pr_res_holder
!= NULL
) &&
1300 (pr_res_holder
->pr_reg_nacl
== nacl
))
1301 __core_scsi3_complete_pro_release(dev
, nacl
, pr_res_holder
, 0);
1302 spin_unlock(&dev
->dev_reservation_lock
);
1304 * Release any registration associated with the struct se_node_acl.
1306 spin_lock(&pr_tmpl
->registration_lock
);
1307 list_for_each_entry_safe(pr_reg
, pr_reg_tmp
,
1308 &pr_tmpl
->registration_list
, pr_reg_list
) {
1310 if (pr_reg
->pr_reg_nacl
!= nacl
)
1313 __core_scsi3_free_registration(dev
, pr_reg
, NULL
, 0);
1315 spin_unlock(&pr_tmpl
->registration_lock
);
1318 void core_scsi3_free_all_registrations(
1319 struct se_device
*dev
)
1321 struct t10_reservation
*pr_tmpl
= &dev
->t10_pr
;
1322 struct t10_pr_registration
*pr_reg
, *pr_reg_tmp
, *pr_res_holder
;
1324 spin_lock(&dev
->dev_reservation_lock
);
1325 pr_res_holder
= dev
->dev_pr_res_holder
;
1326 if (pr_res_holder
!= NULL
) {
1327 struct se_node_acl
*pr_res_nacl
= pr_res_holder
->pr_reg_nacl
;
1328 __core_scsi3_complete_pro_release(dev
, pr_res_nacl
,
1331 spin_unlock(&dev
->dev_reservation_lock
);
1333 spin_lock(&pr_tmpl
->registration_lock
);
1334 list_for_each_entry_safe(pr_reg
, pr_reg_tmp
,
1335 &pr_tmpl
->registration_list
, pr_reg_list
) {
1337 __core_scsi3_free_registration(dev
, pr_reg
, NULL
, 0);
1339 spin_unlock(&pr_tmpl
->registration_lock
);
1341 spin_lock(&pr_tmpl
->aptpl_reg_lock
);
1342 list_for_each_entry_safe(pr_reg
, pr_reg_tmp
, &pr_tmpl
->aptpl_reg_list
,
1343 pr_reg_aptpl_list
) {
1344 list_del(&pr_reg
->pr_reg_aptpl_list
);
1345 kfree(pr_reg
->pr_aptpl_buf
);
1346 kmem_cache_free(t10_pr_reg_cache
, pr_reg
);
1348 spin_unlock(&pr_tmpl
->aptpl_reg_lock
);
1351 static int core_scsi3_tpg_depend_item(struct se_portal_group
*tpg
)
1353 return configfs_depend_item(tpg
->se_tpg_tfo
->tf_subsys
,
1354 &tpg
->tpg_group
.cg_item
);
1357 static void core_scsi3_tpg_undepend_item(struct se_portal_group
*tpg
)
1359 configfs_undepend_item(tpg
->se_tpg_tfo
->tf_subsys
,
1360 &tpg
->tpg_group
.cg_item
);
1362 atomic_dec(&tpg
->tpg_pr_ref_count
);
1363 smp_mb__after_atomic_dec();
1366 static int core_scsi3_nodeacl_depend_item(struct se_node_acl
*nacl
)
1368 struct se_portal_group
*tpg
= nacl
->se_tpg
;
1370 if (nacl
->dynamic_node_acl
)
1373 return configfs_depend_item(tpg
->se_tpg_tfo
->tf_subsys
,
1374 &nacl
->acl_group
.cg_item
);
1377 static void core_scsi3_nodeacl_undepend_item(struct se_node_acl
*nacl
)
1379 struct se_portal_group
*tpg
= nacl
->se_tpg
;
1381 if (nacl
->dynamic_node_acl
) {
1382 atomic_dec(&nacl
->acl_pr_ref_count
);
1383 smp_mb__after_atomic_dec();
1387 configfs_undepend_item(tpg
->se_tpg_tfo
->tf_subsys
,
1388 &nacl
->acl_group
.cg_item
);
1390 atomic_dec(&nacl
->acl_pr_ref_count
);
1391 smp_mb__after_atomic_dec();
1394 static int core_scsi3_lunacl_depend_item(struct se_dev_entry
*se_deve
)
1396 struct se_lun_acl
*lun_acl
= se_deve
->se_lun_acl
;
1397 struct se_node_acl
*nacl
;
1398 struct se_portal_group
*tpg
;
1400 * For nacl->dynamic_node_acl=1
1405 nacl
= lun_acl
->se_lun_nacl
;
1408 return configfs_depend_item(tpg
->se_tpg_tfo
->tf_subsys
,
1409 &lun_acl
->se_lun_group
.cg_item
);
1412 static void core_scsi3_lunacl_undepend_item(struct se_dev_entry
*se_deve
)
1414 struct se_lun_acl
*lun_acl
= se_deve
->se_lun_acl
;
1415 struct se_node_acl
*nacl
;
1416 struct se_portal_group
*tpg
;
1418 * For nacl->dynamic_node_acl=1
1421 atomic_dec(&se_deve
->pr_ref_count
);
1422 smp_mb__after_atomic_dec();
1425 nacl
= lun_acl
->se_lun_nacl
;
1428 configfs_undepend_item(tpg
->se_tpg_tfo
->tf_subsys
,
1429 &lun_acl
->se_lun_group
.cg_item
);
1431 atomic_dec(&se_deve
->pr_ref_count
);
1432 smp_mb__after_atomic_dec();
1435 static sense_reason_t
1436 core_scsi3_decode_spec_i_port(
1438 struct se_portal_group
*tpg
,
1439 unsigned char *l_isid
,
1444 struct se_device
*dev
= cmd
->se_dev
;
1445 struct se_port
*tmp_port
;
1446 struct se_portal_group
*dest_tpg
= NULL
, *tmp_tpg
;
1447 struct se_session
*se_sess
= cmd
->se_sess
;
1448 struct se_node_acl
*dest_node_acl
= NULL
;
1449 struct se_dev_entry
*dest_se_deve
= NULL
, *local_se_deve
;
1450 struct t10_pr_registration
*dest_pr_reg
, *local_pr_reg
, *pr_reg_e
;
1451 struct t10_pr_registration
*pr_reg_tmp
, *pr_reg_tmp_safe
;
1452 LIST_HEAD(tid_dest_list
);
1453 struct pr_transport_id_holder
*tidh_new
, *tidh
, *tidh_tmp
;
1454 struct target_core_fabric_ops
*tmp_tf_ops
;
1456 unsigned char *ptr
, *i_str
= NULL
, proto_ident
, tmp_proto_ident
;
1457 char *iport_ptr
= NULL
, dest_iport
[64], i_buf
[PR_REG_ISID_ID_LEN
];
1459 u32 tpdl
, tid_len
= 0;
1460 int dest_local_nexus
;
1463 memset(dest_iport
, 0, 64);
1465 local_se_deve
= se_sess
->se_node_acl
->device_list
[cmd
->orig_fe_lun
];
1467 * Allocate a struct pr_transport_id_holder and setup the
1468 * local_node_acl and local_se_deve pointers and add to
1469 * struct list_head tid_dest_list for add registration
1470 * processing in the loop of tid_dest_list below.
1472 tidh_new
= kzalloc(sizeof(struct pr_transport_id_holder
), GFP_KERNEL
);
1474 pr_err("Unable to allocate tidh_new\n");
1475 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1477 INIT_LIST_HEAD(&tidh_new
->dest_list
);
1478 tidh_new
->dest_tpg
= tpg
;
1479 tidh_new
->dest_node_acl
= se_sess
->se_node_acl
;
1480 tidh_new
->dest_se_deve
= local_se_deve
;
1482 local_pr_reg
= __core_scsi3_alloc_registration(cmd
->se_dev
,
1483 se_sess
->se_node_acl
, local_se_deve
, l_isid
,
1484 sa_res_key
, all_tg_pt
, aptpl
);
1485 if (!local_pr_reg
) {
1487 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1489 tidh_new
->dest_pr_reg
= local_pr_reg
;
1491 * The local I_T nexus does not hold any configfs dependances,
1492 * so we set tid_h->dest_local_nexus=1 to prevent the
1493 * configfs_undepend_item() calls in the tid_dest_list loops below.
1495 tidh_new
->dest_local_nexus
= 1;
1496 list_add_tail(&tidh_new
->dest_list
, &tid_dest_list
);
1498 if (cmd
->data_length
< 28) {
1499 pr_warn("SPC-PR: Received PR OUT parameter list"
1500 " length too small: %u\n", cmd
->data_length
);
1501 ret
= TCM_INVALID_PARAMETER_LIST
;
1505 buf
= transport_kmap_data_sg(cmd
);
1507 ret
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1512 * For a PERSISTENT RESERVE OUT specify initiator ports payload,
1513 * first extract TransportID Parameter Data Length, and make sure
1514 * the value matches up to the SCSI expected data transfer length.
1516 tpdl
= (buf
[24] & 0xff) << 24;
1517 tpdl
|= (buf
[25] & 0xff) << 16;
1518 tpdl
|= (buf
[26] & 0xff) << 8;
1519 tpdl
|= buf
[27] & 0xff;
1521 if ((tpdl
+ 28) != cmd
->data_length
) {
1522 pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
1523 " does not equal CDB data_length: %u\n", tpdl
,
1525 ret
= TCM_INVALID_PARAMETER_LIST
;
1529 * Start processing the received transport IDs using the
1530 * receiving I_T Nexus portal's fabric dependent methods to
1531 * obtain the SCSI Initiator Port/Device Identifiers.
1536 proto_ident
= (ptr
[0] & 0x0f);
1539 spin_lock(&dev
->se_port_lock
);
1540 list_for_each_entry(tmp_port
, &dev
->dev_sep_list
, sep_list
) {
1541 tmp_tpg
= tmp_port
->sep_tpg
;
1544 tmp_tf_ops
= tmp_tpg
->se_tpg_tfo
;
1547 if (!tmp_tf_ops
->get_fabric_proto_ident
||
1548 !tmp_tf_ops
->tpg_parse_pr_out_transport_id
)
1551 * Look for the matching proto_ident provided by
1552 * the received TransportID
1554 tmp_proto_ident
= tmp_tf_ops
->get_fabric_proto_ident(tmp_tpg
);
1555 if (tmp_proto_ident
!= proto_ident
)
1557 dest_rtpi
= tmp_port
->sep_rtpi
;
1559 i_str
= tmp_tf_ops
->tpg_parse_pr_out_transport_id(
1560 tmp_tpg
, (const char *)ptr
, &tid_len
,
1565 atomic_inc(&tmp_tpg
->tpg_pr_ref_count
);
1566 smp_mb__after_atomic_inc();
1567 spin_unlock(&dev
->se_port_lock
);
1569 if (core_scsi3_tpg_depend_item(tmp_tpg
)) {
1570 pr_err(" core_scsi3_tpg_depend_item()"
1572 atomic_dec(&tmp_tpg
->tpg_pr_ref_count
);
1573 smp_mb__after_atomic_dec();
1574 ret
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1578 * Locate the destination initiator ACL to be registered
1579 * from the decoded fabric module specific TransportID
1582 spin_lock_irq(&tmp_tpg
->acl_node_lock
);
1583 dest_node_acl
= __core_tpg_get_initiator_node_acl(
1585 if (dest_node_acl
) {
1586 atomic_inc(&dest_node_acl
->acl_pr_ref_count
);
1587 smp_mb__after_atomic_inc();
1589 spin_unlock_irq(&tmp_tpg
->acl_node_lock
);
1591 if (!dest_node_acl
) {
1592 core_scsi3_tpg_undepend_item(tmp_tpg
);
1593 spin_lock(&dev
->se_port_lock
);
1597 if (core_scsi3_nodeacl_depend_item(dest_node_acl
)) {
1598 pr_err("configfs_depend_item() failed"
1599 " for dest_node_acl->acl_group\n");
1600 atomic_dec(&dest_node_acl
->acl_pr_ref_count
);
1601 smp_mb__after_atomic_dec();
1602 core_scsi3_tpg_undepend_item(tmp_tpg
);
1603 ret
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1608 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
1609 " %s Port RTPI: %hu\n",
1610 dest_tpg
->se_tpg_tfo
->get_fabric_name(),
1611 dest_node_acl
->initiatorname
, dest_rtpi
);
1613 spin_lock(&dev
->se_port_lock
);
1616 spin_unlock(&dev
->se_port_lock
);
1619 pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
1621 ret
= TCM_INVALID_PARAMETER_LIST
;
1625 pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
1626 " tid_len: %d for %s + %s\n",
1627 dest_tpg
->se_tpg_tfo
->get_fabric_name(), cmd
->data_length
,
1628 tpdl
, tid_len
, i_str
, iport_ptr
);
1630 if (tid_len
> tpdl
) {
1631 pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
1632 " %u for Transport ID: %s\n", tid_len
, ptr
);
1633 core_scsi3_nodeacl_undepend_item(dest_node_acl
);
1634 core_scsi3_tpg_undepend_item(dest_tpg
);
1635 ret
= TCM_INVALID_PARAMETER_LIST
;
1639 * Locate the desintation struct se_dev_entry pointer for matching
1640 * RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
1643 dest_se_deve
= core_get_se_deve_from_rtpi(dest_node_acl
,
1645 if (!dest_se_deve
) {
1646 pr_err("Unable to locate %s dest_se_deve"
1647 " from destination RTPI: %hu\n",
1648 dest_tpg
->se_tpg_tfo
->get_fabric_name(),
1651 core_scsi3_nodeacl_undepend_item(dest_node_acl
);
1652 core_scsi3_tpg_undepend_item(dest_tpg
);
1653 ret
= TCM_INVALID_PARAMETER_LIST
;
1657 if (core_scsi3_lunacl_depend_item(dest_se_deve
)) {
1658 pr_err("core_scsi3_lunacl_depend_item()"
1660 atomic_dec(&dest_se_deve
->pr_ref_count
);
1661 smp_mb__after_atomic_dec();
1662 core_scsi3_nodeacl_undepend_item(dest_node_acl
);
1663 core_scsi3_tpg_undepend_item(dest_tpg
);
1664 ret
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1668 pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
1669 " dest_se_deve mapped_lun: %u\n",
1670 dest_tpg
->se_tpg_tfo
->get_fabric_name(),
1671 dest_node_acl
->initiatorname
, dest_se_deve
->mapped_lun
);
1674 * Skip any TransportIDs that already have a registration for
1677 pr_reg_e
= __core_scsi3_locate_pr_reg(dev
, dest_node_acl
,
1680 core_scsi3_put_pr_reg(pr_reg_e
);
1681 core_scsi3_lunacl_undepend_item(dest_se_deve
);
1682 core_scsi3_nodeacl_undepend_item(dest_node_acl
);
1683 core_scsi3_tpg_undepend_item(dest_tpg
);
1690 * Allocate a struct pr_transport_id_holder and setup
1691 * the dest_node_acl and dest_se_deve pointers for the
1694 tidh_new
= kzalloc(sizeof(struct pr_transport_id_holder
),
1697 pr_err("Unable to allocate tidh_new\n");
1698 core_scsi3_lunacl_undepend_item(dest_se_deve
);
1699 core_scsi3_nodeacl_undepend_item(dest_node_acl
);
1700 core_scsi3_tpg_undepend_item(dest_tpg
);
1701 ret
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
1704 INIT_LIST_HEAD(&tidh_new
->dest_list
);
1705 tidh_new
->dest_tpg
= dest_tpg
;
1706 tidh_new
->dest_node_acl
= dest_node_acl
;
1707 tidh_new
->dest_se_deve
= dest_se_deve
;
1710 * Allocate, but do NOT add the registration for the
1711 * TransportID referenced SCSI Initiator port. This
1712 * done because of the following from spc4r17 in section
1713 * 6.14.3 wrt SPEC_I_PT:
1715 * "If a registration fails for any initiator port (e.g., if th
1716 * logical unit does not have enough resources available to
1717 * hold the registration information), no registrations shall be
1718 * made, and the command shall be terminated with
1719 * CHECK CONDITION status."
1721 * That means we call __core_scsi3_alloc_registration() here,
1722 * and then call __core_scsi3_add_registration() in the
1723 * 2nd loop which will never fail.
1725 dest_pr_reg
= __core_scsi3_alloc_registration(cmd
->se_dev
,
1726 dest_node_acl
, dest_se_deve
, iport_ptr
,
1727 sa_res_key
, all_tg_pt
, aptpl
);
1729 core_scsi3_lunacl_undepend_item(dest_se_deve
);
1730 core_scsi3_nodeacl_undepend_item(dest_node_acl
);
1731 core_scsi3_tpg_undepend_item(dest_tpg
);
1733 ret
= TCM_INVALID_PARAMETER_LIST
;
1736 tidh_new
->dest_pr_reg
= dest_pr_reg
;
1737 list_add_tail(&tidh_new
->dest_list
, &tid_dest_list
);
1745 transport_kunmap_data_sg(cmd
);
1748 * Go ahead and create a registrations from tid_dest_list for the
1749 * SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
1752 * The SA Reservation Key from the PROUT is set for the
1753 * registration, and ALL_TG_PT is also passed. ALL_TG_PT=1
1754 * means that the TransportID Initiator port will be
1755 * registered on all of the target ports in the SCSI target device
1756 * ALL_TG_PT=0 means the registration will only be for the
1757 * SCSI target port the PROUT REGISTER with SPEC_I_PT=1
1760 list_for_each_entry_safe(tidh
, tidh_tmp
, &tid_dest_list
, dest_list
) {
1761 dest_tpg
= tidh
->dest_tpg
;
1762 dest_node_acl
= tidh
->dest_node_acl
;
1763 dest_se_deve
= tidh
->dest_se_deve
;
1764 dest_pr_reg
= tidh
->dest_pr_reg
;
1765 dest_local_nexus
= tidh
->dest_local_nexus
;
1767 list_del(&tidh
->dest_list
);
1770 memset(i_buf
, 0, PR_REG_ISID_ID_LEN
);
1771 core_pr_dump_initiator_port(dest_pr_reg
, i_buf
, PR_REG_ISID_ID_LEN
);
1773 __core_scsi3_add_registration(cmd
->se_dev
, dest_node_acl
,
1776 pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
1777 " registered Transport ID for Node: %s%s Mapped LUN:"
1778 " %u\n", dest_tpg
->se_tpg_tfo
->get_fabric_name(),
1779 dest_node_acl
->initiatorname
, i_buf
, dest_se_deve
->mapped_lun
);
1781 if (dest_local_nexus
)
1784 core_scsi3_lunacl_undepend_item(dest_se_deve
);
1785 core_scsi3_nodeacl_undepend_item(dest_node_acl
);
1786 core_scsi3_tpg_undepend_item(dest_tpg
);
1791 transport_kunmap_data_sg(cmd
);
1794 * For the failure case, release everything from tid_dest_list
1795 * including *dest_pr_reg and the configfs dependances..
1797 list_for_each_entry_safe(tidh
, tidh_tmp
, &tid_dest_list
, dest_list
) {
1798 dest_tpg
= tidh
->dest_tpg
;
1799 dest_node_acl
= tidh
->dest_node_acl
;
1800 dest_se_deve
= tidh
->dest_se_deve
;
1801 dest_pr_reg
= tidh
->dest_pr_reg
;
1802 dest_local_nexus
= tidh
->dest_local_nexus
;
1804 list_del(&tidh
->dest_list
);
1807 * Release any extra ALL_TG_PT=1 registrations for
1808 * the SPEC_I_PT=1 case.
1810 list_for_each_entry_safe(pr_reg_tmp
, pr_reg_tmp_safe
,
1811 &dest_pr_reg
->pr_reg_atp_list
,
1812 pr_reg_atp_mem_list
) {
1813 list_del(&pr_reg_tmp
->pr_reg_atp_mem_list
);
1814 core_scsi3_lunacl_undepend_item(pr_reg_tmp
->pr_reg_deve
);
1815 kmem_cache_free(t10_pr_reg_cache
, pr_reg_tmp
);
1818 kfree(dest_pr_reg
->pr_aptpl_buf
);
1819 kmem_cache_free(t10_pr_reg_cache
, dest_pr_reg
);
1821 if (dest_local_nexus
)
1824 core_scsi3_lunacl_undepend_item(dest_se_deve
);
1825 core_scsi3_nodeacl_undepend_item(dest_node_acl
);
1826 core_scsi3_tpg_undepend_item(dest_tpg
);
1832 * Called with struct se_device->dev_reservation_lock held
1834 static int __core_scsi3_update_aptpl_buf(
1835 struct se_device
*dev
,
1837 u32 pr_aptpl_buf_len
,
1838 int clear_aptpl_metadata
)
1841 struct se_portal_group
*tpg
;
1842 struct t10_pr_registration
*pr_reg
;
1843 unsigned char tmp
[512], isid_buf
[32];
1847 memset(buf
, 0, pr_aptpl_buf_len
);
1849 * Called to clear metadata once APTPL has been deactivated.
1851 if (clear_aptpl_metadata
) {
1852 snprintf(buf
, pr_aptpl_buf_len
,
1853 "No Registrations or Reservations\n");
1857 * Walk the registration list..
1859 spin_lock(&dev
->t10_pr
.registration_lock
);
1860 list_for_each_entry(pr_reg
, &dev
->t10_pr
.registration_list
,
1865 tpg
= pr_reg
->pr_reg_nacl
->se_tpg
;
1866 lun
= pr_reg
->pr_reg_tg_pt_lun
;
1868 * Write out any ISID value to APTPL metadata that was included
1869 * in the original registration.
1871 if (pr_reg
->isid_present_at_reg
)
1872 snprintf(isid_buf
, 32, "initiator_sid=%s\n",
1873 pr_reg
->pr_reg_isid
);
1875 * Include special metadata if the pr_reg matches the
1876 * reservation holder.
1878 if (dev
->dev_pr_res_holder
== pr_reg
) {
1879 snprintf(tmp
, 512, "PR_REG_START: %d"
1880 "\ninitiator_fabric=%s\n"
1881 "initiator_node=%s\n%s"
1883 "res_holder=1\nres_type=%02x\n"
1884 "res_scope=%02x\nres_all_tg_pt=%d\n"
1885 "mapped_lun=%u\n", reg_count
,
1886 tpg
->se_tpg_tfo
->get_fabric_name(),
1887 pr_reg
->pr_reg_nacl
->initiatorname
, isid_buf
,
1888 pr_reg
->pr_res_key
, pr_reg
->pr_res_type
,
1889 pr_reg
->pr_res_scope
, pr_reg
->pr_reg_all_tg_pt
,
1890 pr_reg
->pr_res_mapped_lun
);
1892 snprintf(tmp
, 512, "PR_REG_START: %d\n"
1893 "initiator_fabric=%s\ninitiator_node=%s\n%s"
1894 "sa_res_key=%llu\nres_holder=0\n"
1895 "res_all_tg_pt=%d\nmapped_lun=%u\n",
1896 reg_count
, tpg
->se_tpg_tfo
->get_fabric_name(),
1897 pr_reg
->pr_reg_nacl
->initiatorname
, isid_buf
,
1898 pr_reg
->pr_res_key
, pr_reg
->pr_reg_all_tg_pt
,
1899 pr_reg
->pr_res_mapped_lun
);
1902 if ((len
+ strlen(tmp
) >= pr_aptpl_buf_len
)) {
1903 pr_err("Unable to update renaming"
1904 " APTPL metadata\n");
1905 spin_unlock(&dev
->t10_pr
.registration_lock
);
1908 len
+= sprintf(buf
+len
, "%s", tmp
);
1911 * Include information about the associated SCSI target port.
1913 snprintf(tmp
, 512, "target_fabric=%s\ntarget_node=%s\n"
1914 "tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
1915 " %d\n", tpg
->se_tpg_tfo
->get_fabric_name(),
1916 tpg
->se_tpg_tfo
->tpg_get_wwn(tpg
),
1917 tpg
->se_tpg_tfo
->tpg_get_tag(tpg
),
1918 lun
->lun_sep
->sep_rtpi
, lun
->unpacked_lun
, reg_count
);
1920 if ((len
+ strlen(tmp
) >= pr_aptpl_buf_len
)) {
1921 pr_err("Unable to update renaming"
1922 " APTPL metadata\n");
1923 spin_unlock(&dev
->t10_pr
.registration_lock
);
1926 len
+= sprintf(buf
+len
, "%s", tmp
);
1929 spin_unlock(&dev
->t10_pr
.registration_lock
);
1932 len
+= sprintf(buf
+len
, "No Registrations or Reservations");
1937 static int core_scsi3_update_aptpl_buf(
1938 struct se_device
*dev
,
1940 u32 pr_aptpl_buf_len
,
1941 int clear_aptpl_metadata
)
1945 spin_lock(&dev
->dev_reservation_lock
);
1946 ret
= __core_scsi3_update_aptpl_buf(dev
, buf
, pr_aptpl_buf_len
,
1947 clear_aptpl_metadata
);
1948 spin_unlock(&dev
->dev_reservation_lock
);
1954 * Called with struct se_device->aptpl_file_mutex held
1956 static int __core_scsi3_write_aptpl_to_file(
1957 struct se_device
*dev
,
1959 u32 pr_aptpl_buf_len
)
1961 struct t10_wwn
*wwn
= &dev
->t10_wwn
;
1963 int flags
= O_RDWR
| O_CREAT
| O_TRUNC
;
1967 memset(path
, 0, 512);
1969 if (strlen(&wwn
->unit_serial
[0]) >= 512) {
1970 pr_err("WWN value for struct se_device does not fit"
1971 " into path buffer\n");
1975 snprintf(path
, 512, "/var/target/pr/aptpl_%s", &wwn
->unit_serial
[0]);
1976 file
= filp_open(path
, flags
, 0600);
1978 pr_err("filp_open(%s) for APTPL metadata"
1980 return PTR_ERR(file
);
1983 if (!pr_aptpl_buf_len
)
1984 pr_aptpl_buf_len
= (strlen(&buf
[0]) + 1); /* Add extra for NULL */
1986 ret
= kernel_write(file
, buf
, pr_aptpl_buf_len
, 0);
1989 pr_debug("Error writing APTPL metadata file: %s\n", path
);
1992 return ret
? -EIO
: 0;
1996 core_scsi3_update_and_write_aptpl(struct se_device
*dev
, unsigned char *in_buf
,
1997 u32 in_pr_aptpl_buf_len
)
1999 unsigned char null_buf
[64], *buf
;
2000 u32 pr_aptpl_buf_len
;
2001 int clear_aptpl_metadata
= 0;
2005 * Can be called with a NULL pointer from PROUT service action CLEAR
2008 memset(null_buf
, 0, 64);
2011 * This will clear the APTPL metadata to:
2012 * "No Registrations or Reservations" status
2014 pr_aptpl_buf_len
= 64;
2015 clear_aptpl_metadata
= 1;
2018 pr_aptpl_buf_len
= in_pr_aptpl_buf_len
;
2021 ret
= core_scsi3_update_aptpl_buf(dev
, buf
, pr_aptpl_buf_len
,
2022 clear_aptpl_metadata
);
2027 * __core_scsi3_write_aptpl_to_file() will call strlen()
2028 * on the passed buf to determine pr_aptpl_buf_len.
2030 return __core_scsi3_write_aptpl_to_file(dev
, buf
, 0);
2033 static sense_reason_t
2034 core_scsi3_emulate_pro_register(struct se_cmd
*cmd
, u64 res_key
, u64 sa_res_key
,
2035 int aptpl
, int all_tg_pt
, int spec_i_pt
, enum register_type register_type
)
2037 struct se_session
*se_sess
= cmd
->se_sess
;
2038 struct se_device
*dev
= cmd
->se_dev
;
2039 struct se_dev_entry
*se_deve
;
2040 struct se_lun
*se_lun
= cmd
->se_lun
;
2041 struct se_portal_group
*se_tpg
;
2042 struct t10_pr_registration
*pr_reg
, *pr_reg_p
, *pr_reg_tmp
, *pr_reg_e
;
2043 struct t10_reservation
*pr_tmpl
= &dev
->t10_pr
;
2044 /* Used for APTPL metadata w/ UNREGISTER */
2045 unsigned char *pr_aptpl_buf
= NULL
;
2046 unsigned char isid_buf
[PR_REG_ISID_LEN
], *isid_ptr
= NULL
;
2047 sense_reason_t ret
= TCM_NO_SENSE
;
2048 int pr_holder
= 0, type
;
2050 if (!se_sess
|| !se_lun
) {
2051 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2052 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2054 se_tpg
= se_sess
->se_tpg
;
2055 se_deve
= se_sess
->se_node_acl
->device_list
[cmd
->orig_fe_lun
];
2057 if (se_tpg
->se_tpg_tfo
->sess_get_initiator_sid
) {
2058 memset(&isid_buf
[0], 0, PR_REG_ISID_LEN
);
2059 se_tpg
->se_tpg_tfo
->sess_get_initiator_sid(se_sess
, &isid_buf
[0],
2061 isid_ptr
= &isid_buf
[0];
2064 * Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
2066 pr_reg_e
= core_scsi3_locate_pr_reg(dev
, se_sess
->se_node_acl
, se_sess
);
2069 pr_warn("SPC-3 PR: Reservation Key non-zero"
2070 " for SA REGISTER, returning CONFLICT\n");
2071 return TCM_RESERVATION_CONFLICT
;
2074 * Do nothing but return GOOD status.
2081 * Perform the Service Action REGISTER on the Initiator
2082 * Port Endpoint that the PRO was received from on the
2083 * Logical Unit of the SCSI device server.
2085 if (core_scsi3_alloc_registration(cmd
->se_dev
,
2086 se_sess
->se_node_acl
, se_deve
, isid_ptr
,
2087 sa_res_key
, all_tg_pt
, aptpl
,
2088 register_type
, 0)) {
2089 pr_err("Unable to allocate"
2090 " struct t10_pr_registration\n");
2091 return TCM_INVALID_PARAMETER_LIST
;
2095 * Register both the Initiator port that received
2096 * PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
2097 * TransportID from Parameter list and loop through
2098 * fabric dependent parameter list while calling
2099 * logic from of core_scsi3_alloc_registration() for
2100 * each TransportID provided SCSI Initiator Port/Device
2102 ret
= core_scsi3_decode_spec_i_port(cmd
, se_tpg
,
2103 isid_ptr
, sa_res_key
, all_tg_pt
, aptpl
);
2108 * Nothing left to do for the APTPL=0 case.
2111 pr_tmpl
->pr_aptpl_active
= 0;
2112 core_scsi3_update_and_write_aptpl(cmd
->se_dev
, NULL
, 0);
2113 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
2118 * Locate the newly allocated local I_T Nexus *pr_reg, and
2119 * update the APTPL metadata information using its
2120 * preallocated *pr_reg->pr_aptpl_buf.
2122 pr_reg
= core_scsi3_locate_pr_reg(cmd
->se_dev
,
2123 se_sess
->se_node_acl
, se_sess
);
2125 if (core_scsi3_update_and_write_aptpl(cmd
->se_dev
,
2126 &pr_reg
->pr_aptpl_buf
[0],
2127 pr_tmpl
->pr_aptpl_buf_len
)) {
2128 pr_tmpl
->pr_aptpl_active
= 1;
2129 pr_debug("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n");
2132 goto out_put_pr_reg
;
2136 * Locate the existing *pr_reg via struct se_node_acl pointers
2139 type
= pr_reg
->pr_res_type
;
2141 if (register_type
== REGISTER
) {
2142 if (res_key
!= pr_reg
->pr_res_key
) {
2143 pr_err("SPC-3 PR REGISTER: Received"
2144 " res_key: 0x%016Lx does not match"
2145 " existing SA REGISTER res_key:"
2146 " 0x%016Lx\n", res_key
,
2147 pr_reg
->pr_res_key
);
2148 ret
= TCM_RESERVATION_CONFLICT
;
2149 goto out_put_pr_reg
;
2154 pr_err("SPC-3 PR REGISTER: SPEC_I_PT"
2155 " set on a registered nexus\n");
2156 ret
= TCM_INVALID_PARAMETER_LIST
;
2157 goto out_put_pr_reg
;
2161 * An existing ALL_TG_PT=1 registration being released
2162 * must also set ALL_TG_PT=1 in the incoming PROUT.
2164 if (pr_reg
->pr_reg_all_tg_pt
&& !all_tg_pt
) {
2165 pr_err("SPC-3 PR REGISTER: ALL_TG_PT=1"
2166 " registration exists, but ALL_TG_PT=1 bit not"
2167 " present in received PROUT\n");
2168 ret
= TCM_INVALID_CDB_FIELD
;
2169 goto out_put_pr_reg
;
2173 * Allocate APTPL metadata buffer used for UNREGISTER ops
2176 pr_aptpl_buf
= kzalloc(pr_tmpl
->pr_aptpl_buf_len
,
2178 if (!pr_aptpl_buf
) {
2179 pr_err("Unable to allocate"
2181 ret
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2182 goto out_put_pr_reg
;
2187 * sa_res_key=0 Unregister Reservation Key for registered I_T
2188 * Nexus sa_res_key=1 Change Reservation Key for registered I_T
2192 pr_holder
= core_scsi3_check_implict_release(
2193 cmd
->se_dev
, pr_reg
);
2194 if (pr_holder
< 0) {
2195 kfree(pr_aptpl_buf
);
2196 ret
= TCM_RESERVATION_CONFLICT
;
2197 goto out_put_pr_reg
;
2200 spin_lock(&pr_tmpl
->registration_lock
);
2202 * Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
2203 * and matching pr_res_key.
2205 if (pr_reg
->pr_reg_all_tg_pt
) {
2206 list_for_each_entry_safe(pr_reg_p
, pr_reg_tmp
,
2207 &pr_tmpl
->registration_list
,
2210 if (!pr_reg_p
->pr_reg_all_tg_pt
)
2212 if (pr_reg_p
->pr_res_key
!= res_key
)
2214 if (pr_reg
== pr_reg_p
)
2216 if (strcmp(pr_reg
->pr_reg_nacl
->initiatorname
,
2217 pr_reg_p
->pr_reg_nacl
->initiatorname
))
2220 __core_scsi3_free_registration(dev
,
2226 * Release the calling I_T Nexus registration now..
2228 __core_scsi3_free_registration(cmd
->se_dev
, pr_reg
, NULL
, 1);
2231 * From spc4r17, section 5.7.11.3 Unregistering
2233 * If the persistent reservation is a registrants only
2234 * type, the device server shall establish a unit
2235 * attention condition for the initiator port associated
2236 * with every registered I_T nexus except for the I_T
2237 * nexus on which the PERSISTENT RESERVE OUT command was
2238 * received, with the additional sense code set to
2239 * RESERVATIONS RELEASED.
2242 (type
== PR_TYPE_WRITE_EXCLUSIVE_REGONLY
||
2243 type
== PR_TYPE_EXCLUSIVE_ACCESS_REGONLY
)) {
2244 list_for_each_entry(pr_reg_p
,
2245 &pr_tmpl
->registration_list
,
2248 core_scsi3_ua_allocate(
2249 pr_reg_p
->pr_reg_nacl
,
2250 pr_reg_p
->pr_res_mapped_lun
,
2252 ASCQ_2AH_RESERVATIONS_RELEASED
);
2255 spin_unlock(&pr_tmpl
->registration_lock
);
2258 pr_tmpl
->pr_aptpl_active
= 0;
2259 core_scsi3_update_and_write_aptpl(dev
, NULL
, 0);
2260 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
2261 " for UNREGISTER\n");
2265 if (!core_scsi3_update_and_write_aptpl(dev
, &pr_aptpl_buf
[0],
2266 pr_tmpl
->pr_aptpl_buf_len
)) {
2267 pr_tmpl
->pr_aptpl_active
= 1;
2268 pr_debug("SPC-3 PR: Set APTPL Bit Activated"
2269 " for UNREGISTER\n");
2272 goto out_free_aptpl_buf
;
2276 * Increment PRgeneration counter for struct se_device"
2277 * upon a successful REGISTER, see spc4r17 section 6.3.2
2278 * READ_KEYS service action.
2280 pr_reg
->pr_res_generation
= core_scsi3_pr_generation(cmd
->se_dev
);
2281 pr_reg
->pr_res_key
= sa_res_key
;
2282 pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
2283 " Key for %s to: 0x%016Lx PRgeneration:"
2284 " 0x%08x\n", cmd
->se_tfo
->get_fabric_name(),
2285 (register_type
== REGISTER_AND_IGNORE_EXISTING_KEY
) ? "_AND_IGNORE_EXISTING_KEY" : "",
2286 pr_reg
->pr_reg_nacl
->initiatorname
,
2287 pr_reg
->pr_res_key
, pr_reg
->pr_res_generation
);
2290 pr_tmpl
->pr_aptpl_active
= 0;
2291 core_scsi3_update_and_write_aptpl(dev
, NULL
, 0);
2292 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
2295 goto out_put_pr_reg
;
2298 if (!core_scsi3_update_and_write_aptpl(dev
, &pr_aptpl_buf
[0],
2299 pr_tmpl
->pr_aptpl_buf_len
)) {
2300 pr_tmpl
->pr_aptpl_active
= 1;
2301 pr_debug("SPC-3 PR: Set APTPL Bit Activated"
2306 kfree(pr_aptpl_buf
);
2309 core_scsi3_put_pr_reg(pr_reg
);
2313 unsigned char *core_scsi3_pr_dump_type(int type
)
2316 case PR_TYPE_WRITE_EXCLUSIVE
:
2317 return "Write Exclusive Access";
2318 case PR_TYPE_EXCLUSIVE_ACCESS
:
2319 return "Exclusive Access";
2320 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY
:
2321 return "Write Exclusive Access, Registrants Only";
2322 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY
:
2323 return "Exclusive Access, Registrants Only";
2324 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG
:
2325 return "Write Exclusive Access, All Registrants";
2326 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG
:
2327 return "Exclusive Access, All Registrants";
2332 return "Unknown SPC-3 PR Type";
2335 static sense_reason_t
2336 core_scsi3_pro_reserve(struct se_cmd
*cmd
, int type
, int scope
, u64 res_key
)
2338 struct se_device
*dev
= cmd
->se_dev
;
2339 struct se_session
*se_sess
= cmd
->se_sess
;
2340 struct se_lun
*se_lun
= cmd
->se_lun
;
2341 struct t10_pr_registration
*pr_reg
, *pr_res_holder
;
2342 struct t10_reservation
*pr_tmpl
= &dev
->t10_pr
;
2343 char i_buf
[PR_REG_ISID_ID_LEN
];
2346 memset(i_buf
, 0, PR_REG_ISID_ID_LEN
);
2348 if (!se_sess
|| !se_lun
) {
2349 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2350 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2353 * Locate the existing *pr_reg via struct se_node_acl pointers
2355 pr_reg
= core_scsi3_locate_pr_reg(cmd
->se_dev
, se_sess
->se_node_acl
,
2358 pr_err("SPC-3 PR: Unable to locate"
2359 " PR_REGISTERED *pr_reg for RESERVE\n");
2360 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2363 * From spc4r17 Section 5.7.9: Reserving:
2365 * An application client creates a persistent reservation by issuing
2366 * a PERSISTENT RESERVE OUT command with RESERVE service action through
2367 * a registered I_T nexus with the following parameters:
2368 * a) RESERVATION KEY set to the value of the reservation key that is
2369 * registered with the logical unit for the I_T nexus; and
2371 if (res_key
!= pr_reg
->pr_res_key
) {
2372 pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
2373 " does not match existing SA REGISTER res_key:"
2374 " 0x%016Lx\n", res_key
, pr_reg
->pr_res_key
);
2375 ret
= TCM_RESERVATION_CONFLICT
;
2376 goto out_put_pr_reg
;
2379 * From spc4r17 Section 5.7.9: Reserving:
2382 * b) TYPE field and SCOPE field set to the persistent reservation
2385 * Only one persistent reservation is allowed at a time per logical unit
2386 * and that persistent reservation has a scope of LU_SCOPE.
2388 if (scope
!= PR_SCOPE_LU_SCOPE
) {
2389 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope
);
2390 ret
= TCM_INVALID_PARAMETER_LIST
;
2391 goto out_put_pr_reg
;
2394 * See if we have an existing PR reservation holder pointer at
2395 * struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
2398 spin_lock(&dev
->dev_reservation_lock
);
2399 pr_res_holder
= dev
->dev_pr_res_holder
;
2400 if (pr_res_holder
) {
2402 * From spc4r17 Section 5.7.9: Reserving:
2404 * If the device server receives a PERSISTENT RESERVE OUT
2405 * command from an I_T nexus other than a persistent reservation
2406 * holder (see 5.7.10) that attempts to create a persistent
2407 * reservation when a persistent reservation already exists for
2408 * the logical unit, then the command shall be completed with
2409 * RESERVATION CONFLICT status.
2411 if (pr_res_holder
!= pr_reg
) {
2412 struct se_node_acl
*pr_res_nacl
= pr_res_holder
->pr_reg_nacl
;
2413 pr_err("SPC-3 PR: Attempted RESERVE from"
2414 " [%s]: %s while reservation already held by"
2415 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2416 cmd
->se_tfo
->get_fabric_name(),
2417 se_sess
->se_node_acl
->initiatorname
,
2418 pr_res_nacl
->se_tpg
->se_tpg_tfo
->get_fabric_name(),
2419 pr_res_holder
->pr_reg_nacl
->initiatorname
);
2421 spin_unlock(&dev
->dev_reservation_lock
);
2422 ret
= TCM_RESERVATION_CONFLICT
;
2423 goto out_put_pr_reg
;
2426 * From spc4r17 Section 5.7.9: Reserving:
2428 * If a persistent reservation holder attempts to modify the
2429 * type or scope of an existing persistent reservation, the
2430 * command shall be completed with RESERVATION CONFLICT status.
2432 if ((pr_res_holder
->pr_res_type
!= type
) ||
2433 (pr_res_holder
->pr_res_scope
!= scope
)) {
2434 struct se_node_acl
*pr_res_nacl
= pr_res_holder
->pr_reg_nacl
;
2435 pr_err("SPC-3 PR: Attempted RESERVE from"
2436 " [%s]: %s trying to change TYPE and/or SCOPE,"
2437 " while reservation already held by [%s]: %s,"
2438 " returning RESERVATION_CONFLICT\n",
2439 cmd
->se_tfo
->get_fabric_name(),
2440 se_sess
->se_node_acl
->initiatorname
,
2441 pr_res_nacl
->se_tpg
->se_tpg_tfo
->get_fabric_name(),
2442 pr_res_holder
->pr_reg_nacl
->initiatorname
);
2444 spin_unlock(&dev
->dev_reservation_lock
);
2445 ret
= TCM_RESERVATION_CONFLICT
;
2446 goto out_put_pr_reg
;
2449 * From spc4r17 Section 5.7.9: Reserving:
2451 * If the device server receives a PERSISTENT RESERVE OUT
2452 * command with RESERVE service action where the TYPE field and
2453 * the SCOPE field contain the same values as the existing type
2454 * and scope from a persistent reservation holder, it shall not
2455 * make any change to the existing persistent reservation and
2456 * shall completethe command with GOOD status.
2458 spin_unlock(&dev
->dev_reservation_lock
);
2460 goto out_put_pr_reg
;
2463 * Otherwise, our *pr_reg becomes the PR reservation holder for said
2464 * TYPE/SCOPE. Also set the received scope and type in *pr_reg.
2466 pr_reg
->pr_res_scope
= scope
;
2467 pr_reg
->pr_res_type
= type
;
2468 pr_reg
->pr_res_holder
= 1;
2469 dev
->dev_pr_res_holder
= pr_reg
;
2470 core_pr_dump_initiator_port(pr_reg
, i_buf
, PR_REG_ISID_ID_LEN
);
2472 pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
2473 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2474 cmd
->se_tfo
->get_fabric_name(), core_scsi3_pr_dump_type(type
),
2475 (pr_reg
->pr_reg_all_tg_pt
) ? 1 : 0);
2476 pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
2477 cmd
->se_tfo
->get_fabric_name(),
2478 se_sess
->se_node_acl
->initiatorname
,
2480 spin_unlock(&dev
->dev_reservation_lock
);
2482 if (pr_tmpl
->pr_aptpl_active
) {
2483 if (!core_scsi3_update_and_write_aptpl(cmd
->se_dev
,
2484 &pr_reg
->pr_aptpl_buf
[0],
2485 pr_tmpl
->pr_aptpl_buf_len
)) {
2486 pr_debug("SPC-3 PR: Updated APTPL metadata"
2493 core_scsi3_put_pr_reg(pr_reg
);
2497 static sense_reason_t
2498 core_scsi3_emulate_pro_reserve(struct se_cmd
*cmd
, int type
, int scope
,
2502 case PR_TYPE_WRITE_EXCLUSIVE
:
2503 case PR_TYPE_EXCLUSIVE_ACCESS
:
2504 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY
:
2505 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY
:
2506 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG
:
2507 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG
:
2508 return core_scsi3_pro_reserve(cmd
, type
, scope
, res_key
);
2510 pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
2512 return TCM_INVALID_CDB_FIELD
;
2517 * Called with struct se_device->dev_reservation_lock held.
2519 static void __core_scsi3_complete_pro_release(
2520 struct se_device
*dev
,
2521 struct se_node_acl
*se_nacl
,
2522 struct t10_pr_registration
*pr_reg
,
2525 struct target_core_fabric_ops
*tfo
= se_nacl
->se_tpg
->se_tpg_tfo
;
2526 char i_buf
[PR_REG_ISID_ID_LEN
];
2528 memset(i_buf
, 0, PR_REG_ISID_ID_LEN
);
2529 core_pr_dump_initiator_port(pr_reg
, i_buf
, PR_REG_ISID_ID_LEN
);
2531 * Go ahead and release the current PR reservation holder.
2533 dev
->dev_pr_res_holder
= NULL
;
2535 pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
2536 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2537 tfo
->get_fabric_name(), (explict
) ? "explict" : "implict",
2538 core_scsi3_pr_dump_type(pr_reg
->pr_res_type
),
2539 (pr_reg
->pr_reg_all_tg_pt
) ? 1 : 0);
2540 pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
2541 tfo
->get_fabric_name(), se_nacl
->initiatorname
,
2544 * Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
2546 pr_reg
->pr_res_holder
= pr_reg
->pr_res_type
= pr_reg
->pr_res_scope
= 0;
2549 static sense_reason_t
2550 core_scsi3_emulate_pro_release(struct se_cmd
*cmd
, int type
, int scope
,
2553 struct se_device
*dev
= cmd
->se_dev
;
2554 struct se_session
*se_sess
= cmd
->se_sess
;
2555 struct se_lun
*se_lun
= cmd
->se_lun
;
2556 struct t10_pr_registration
*pr_reg
, *pr_reg_p
, *pr_res_holder
;
2557 struct t10_reservation
*pr_tmpl
= &dev
->t10_pr
;
2559 sense_reason_t ret
= 0;
2561 if (!se_sess
|| !se_lun
) {
2562 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
2563 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2566 * Locate the existing *pr_reg via struct se_node_acl pointers
2568 pr_reg
= core_scsi3_locate_pr_reg(dev
, se_sess
->se_node_acl
, se_sess
);
2570 pr_err("SPC-3 PR: Unable to locate"
2571 " PR_REGISTERED *pr_reg for RELEASE\n");
2572 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2575 * From spc4r17 Section 5.7.11.2 Releasing:
2577 * If there is no persistent reservation or in response to a persistent
2578 * reservation release request from a registered I_T nexus that is not a
2579 * persistent reservation holder (see 5.7.10), the device server shall
2582 * a) Not release the persistent reservation, if any;
2583 * b) Not remove any registrations; and
2584 * c) Complete the command with GOOD status.
2586 spin_lock(&dev
->dev_reservation_lock
);
2587 pr_res_holder
= dev
->dev_pr_res_holder
;
2588 if (!pr_res_holder
) {
2590 * No persistent reservation, return GOOD status.
2592 spin_unlock(&dev
->dev_reservation_lock
);
2593 goto out_put_pr_reg
;
2595 if ((pr_res_holder
->pr_res_type
== PR_TYPE_WRITE_EXCLUSIVE_ALLREG
) ||
2596 (pr_res_holder
->pr_res_type
== PR_TYPE_EXCLUSIVE_ACCESS_ALLREG
))
2599 if ((all_reg
== 0) && (pr_res_holder
!= pr_reg
)) {
2601 * Non 'All Registrants' PR Type cases..
2602 * Release request from a registered I_T nexus that is not a
2603 * persistent reservation holder. return GOOD status.
2605 spin_unlock(&dev
->dev_reservation_lock
);
2606 goto out_put_pr_reg
;
2610 * From spc4r17 Section 5.7.11.2 Releasing:
2612 * Only the persistent reservation holder (see 5.7.10) is allowed to
2613 * release a persistent reservation.
2615 * An application client releases the persistent reservation by issuing
2616 * a PERSISTENT RESERVE OUT command with RELEASE service action through
2617 * an I_T nexus that is a persistent reservation holder with the
2618 * following parameters:
2620 * a) RESERVATION KEY field set to the value of the reservation key
2621 * that is registered with the logical unit for the I_T nexus;
2623 if (res_key
!= pr_reg
->pr_res_key
) {
2624 pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
2625 " does not match existing SA REGISTER res_key:"
2626 " 0x%016Lx\n", res_key
, pr_reg
->pr_res_key
);
2627 spin_unlock(&dev
->dev_reservation_lock
);
2628 ret
= TCM_RESERVATION_CONFLICT
;
2629 goto out_put_pr_reg
;
2632 * From spc4r17 Section 5.7.11.2 Releasing and above:
2634 * b) TYPE field and SCOPE field set to match the persistent
2635 * reservation being released.
2637 if ((pr_res_holder
->pr_res_type
!= type
) ||
2638 (pr_res_holder
->pr_res_scope
!= scope
)) {
2639 struct se_node_acl
*pr_res_nacl
= pr_res_holder
->pr_reg_nacl
;
2640 pr_err("SPC-3 PR RELEASE: Attempted to release"
2641 " reservation from [%s]: %s with different TYPE "
2642 "and/or SCOPE while reservation already held by"
2643 " [%s]: %s, returning RESERVATION_CONFLICT\n",
2644 cmd
->se_tfo
->get_fabric_name(),
2645 se_sess
->se_node_acl
->initiatorname
,
2646 pr_res_nacl
->se_tpg
->se_tpg_tfo
->get_fabric_name(),
2647 pr_res_holder
->pr_reg_nacl
->initiatorname
);
2649 spin_unlock(&dev
->dev_reservation_lock
);
2650 ret
= TCM_RESERVATION_CONFLICT
;
2651 goto out_put_pr_reg
;
2654 * In response to a persistent reservation release request from the
2655 * persistent reservation holder the device server shall perform a
2656 * release by doing the following as an uninterrupted series of actions:
2657 * a) Release the persistent reservation;
2658 * b) Not remove any registration(s);
2659 * c) If the released persistent reservation is a registrants only type
2660 * or all registrants type persistent reservation,
2661 * the device server shall establish a unit attention condition for
2662 * the initiator port associated with every regis-
2663 * tered I_T nexus other than I_T nexus on which the PERSISTENT
2664 * RESERVE OUT command with RELEASE service action was received,
2665 * with the additional sense code set to RESERVATIONS RELEASED; and
2666 * d) If the persistent reservation is of any other type, the device
2667 * server shall not establish a unit attention condition.
2669 __core_scsi3_complete_pro_release(dev
, se_sess
->se_node_acl
,
2672 spin_unlock(&dev
->dev_reservation_lock
);
2674 if ((type
!= PR_TYPE_WRITE_EXCLUSIVE_REGONLY
) &&
2675 (type
!= PR_TYPE_EXCLUSIVE_ACCESS_REGONLY
) &&
2676 (type
!= PR_TYPE_WRITE_EXCLUSIVE_ALLREG
) &&
2677 (type
!= PR_TYPE_EXCLUSIVE_ACCESS_ALLREG
)) {
2679 * If no UNIT ATTENTION conditions will be established for
2680 * PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
2681 * go ahead and check for APTPL=1 update+write below
2686 spin_lock(&pr_tmpl
->registration_lock
);
2687 list_for_each_entry(pr_reg_p
, &pr_tmpl
->registration_list
,
2690 * Do not establish a UNIT ATTENTION condition
2691 * for the calling I_T Nexus
2693 if (pr_reg_p
== pr_reg
)
2696 core_scsi3_ua_allocate(pr_reg_p
->pr_reg_nacl
,
2697 pr_reg_p
->pr_res_mapped_lun
,
2698 0x2A, ASCQ_2AH_RESERVATIONS_RELEASED
);
2700 spin_unlock(&pr_tmpl
->registration_lock
);
2703 if (pr_tmpl
->pr_aptpl_active
) {
2704 if (!core_scsi3_update_and_write_aptpl(cmd
->se_dev
,
2705 &pr_reg
->pr_aptpl_buf
[0], pr_tmpl
->pr_aptpl_buf_len
)) {
2706 pr_debug("SPC-3 PR: Updated APTPL metadata for RELEASE\n");
2710 core_scsi3_put_pr_reg(pr_reg
);
2714 static sense_reason_t
2715 core_scsi3_emulate_pro_clear(struct se_cmd
*cmd
, u64 res_key
)
2717 struct se_device
*dev
= cmd
->se_dev
;
2718 struct se_node_acl
*pr_reg_nacl
;
2719 struct se_session
*se_sess
= cmd
->se_sess
;
2720 struct t10_reservation
*pr_tmpl
= &dev
->t10_pr
;
2721 struct t10_pr_registration
*pr_reg
, *pr_reg_tmp
, *pr_reg_n
, *pr_res_holder
;
2722 u32 pr_res_mapped_lun
= 0;
2723 int calling_it_nexus
= 0;
2725 * Locate the existing *pr_reg via struct se_node_acl pointers
2727 pr_reg_n
= core_scsi3_locate_pr_reg(cmd
->se_dev
,
2728 se_sess
->se_node_acl
, se_sess
);
2730 pr_err("SPC-3 PR: Unable to locate"
2731 " PR_REGISTERED *pr_reg for CLEAR\n");
2732 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2735 * From spc4r17 section 5.7.11.6, Clearing:
2737 * Any application client may release the persistent reservation and
2738 * remove all registrations from a device server by issuing a
2739 * PERSISTENT RESERVE OUT command with CLEAR service action through a
2740 * registered I_T nexus with the following parameter:
2742 * a) RESERVATION KEY field set to the value of the reservation key
2743 * that is registered with the logical unit for the I_T nexus.
2745 if (res_key
!= pr_reg_n
->pr_res_key
) {
2746 pr_err("SPC-3 PR REGISTER: Received"
2747 " res_key: 0x%016Lx does not match"
2748 " existing SA REGISTER res_key:"
2749 " 0x%016Lx\n", res_key
, pr_reg_n
->pr_res_key
);
2750 core_scsi3_put_pr_reg(pr_reg_n
);
2751 return TCM_RESERVATION_CONFLICT
;
2754 * a) Release the persistent reservation, if any;
2756 spin_lock(&dev
->dev_reservation_lock
);
2757 pr_res_holder
= dev
->dev_pr_res_holder
;
2758 if (pr_res_holder
) {
2759 struct se_node_acl
*pr_res_nacl
= pr_res_holder
->pr_reg_nacl
;
2760 __core_scsi3_complete_pro_release(dev
, pr_res_nacl
,
2763 spin_unlock(&dev
->dev_reservation_lock
);
2765 * b) Remove all registration(s) (see spc4r17 5.7.7);
2767 spin_lock(&pr_tmpl
->registration_lock
);
2768 list_for_each_entry_safe(pr_reg
, pr_reg_tmp
,
2769 &pr_tmpl
->registration_list
, pr_reg_list
) {
2771 calling_it_nexus
= (pr_reg_n
== pr_reg
) ? 1 : 0;
2772 pr_reg_nacl
= pr_reg
->pr_reg_nacl
;
2773 pr_res_mapped_lun
= pr_reg
->pr_res_mapped_lun
;
2774 __core_scsi3_free_registration(dev
, pr_reg
, NULL
,
2777 * e) Establish a unit attention condition for the initiator
2778 * port associated with every registered I_T nexus other
2779 * than the I_T nexus on which the PERSISTENT RESERVE OUT
2780 * command with CLEAR service action was received, with the
2781 * additional sense code set to RESERVATIONS PREEMPTED.
2783 if (!calling_it_nexus
)
2784 core_scsi3_ua_allocate(pr_reg_nacl
, pr_res_mapped_lun
,
2785 0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED
);
2787 spin_unlock(&pr_tmpl
->registration_lock
);
2789 pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
2790 cmd
->se_tfo
->get_fabric_name());
2792 if (pr_tmpl
->pr_aptpl_active
) {
2793 core_scsi3_update_and_write_aptpl(cmd
->se_dev
, NULL
, 0);
2794 pr_debug("SPC-3 PR: Updated APTPL metadata"
2798 core_scsi3_pr_generation(dev
);
2803 * Called with struct se_device->dev_reservation_lock held.
2805 static void __core_scsi3_complete_pro_preempt(
2806 struct se_device
*dev
,
2807 struct t10_pr_registration
*pr_reg
,
2808 struct list_head
*preempt_and_abort_list
,
2811 enum preempt_type preempt_type
)
2813 struct se_node_acl
*nacl
= pr_reg
->pr_reg_nacl
;
2814 struct target_core_fabric_ops
*tfo
= nacl
->se_tpg
->se_tpg_tfo
;
2815 char i_buf
[PR_REG_ISID_ID_LEN
];
2817 memset(i_buf
, 0, PR_REG_ISID_ID_LEN
);
2818 core_pr_dump_initiator_port(pr_reg
, i_buf
, PR_REG_ISID_ID_LEN
);
2820 * Do an implict RELEASE of the existing reservation.
2822 if (dev
->dev_pr_res_holder
)
2823 __core_scsi3_complete_pro_release(dev
, nacl
,
2824 dev
->dev_pr_res_holder
, 0);
2826 dev
->dev_pr_res_holder
= pr_reg
;
2827 pr_reg
->pr_res_holder
= 1;
2828 pr_reg
->pr_res_type
= type
;
2829 pr_reg
->pr_res_scope
= scope
;
2831 pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
2832 " reservation holder TYPE: %s ALL_TG_PT: %d\n",
2833 tfo
->get_fabric_name(), (preempt_type
== PREEMPT_AND_ABORT
) ? "_AND_ABORT" : "",
2834 core_scsi3_pr_dump_type(type
),
2835 (pr_reg
->pr_reg_all_tg_pt
) ? 1 : 0);
2836 pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
2837 tfo
->get_fabric_name(), (preempt_type
== PREEMPT_AND_ABORT
) ? "_AND_ABORT" : "",
2838 nacl
->initiatorname
, i_buf
);
2840 * For PREEMPT_AND_ABORT, add the preempting reservation's
2841 * struct t10_pr_registration to the list that will be compared
2842 * against received CDBs..
2844 if (preempt_and_abort_list
)
2845 list_add_tail(&pr_reg
->pr_reg_abort_list
,
2846 preempt_and_abort_list
);
2849 static void core_scsi3_release_preempt_and_abort(
2850 struct list_head
*preempt_and_abort_list
,
2851 struct t10_pr_registration
*pr_reg_holder
)
2853 struct t10_pr_registration
*pr_reg
, *pr_reg_tmp
;
2855 list_for_each_entry_safe(pr_reg
, pr_reg_tmp
, preempt_and_abort_list
,
2856 pr_reg_abort_list
) {
2858 list_del(&pr_reg
->pr_reg_abort_list
);
2859 if (pr_reg_holder
== pr_reg
)
2861 if (pr_reg
->pr_res_holder
) {
2862 pr_warn("pr_reg->pr_res_holder still set\n");
2866 pr_reg
->pr_reg_deve
= NULL
;
2867 pr_reg
->pr_reg_nacl
= NULL
;
2868 kfree(pr_reg
->pr_aptpl_buf
);
2869 kmem_cache_free(t10_pr_reg_cache
, pr_reg
);
2873 static sense_reason_t
2874 core_scsi3_pro_preempt(struct se_cmd
*cmd
, int type
, int scope
, u64 res_key
,
2875 u64 sa_res_key
, enum preempt_type preempt_type
)
2877 struct se_device
*dev
= cmd
->se_dev
;
2878 struct se_node_acl
*pr_reg_nacl
;
2879 struct se_session
*se_sess
= cmd
->se_sess
;
2880 LIST_HEAD(preempt_and_abort_list
);
2881 struct t10_pr_registration
*pr_reg
, *pr_reg_tmp
, *pr_reg_n
, *pr_res_holder
;
2882 struct t10_reservation
*pr_tmpl
= &dev
->t10_pr
;
2883 u32 pr_res_mapped_lun
= 0;
2884 int all_reg
= 0, calling_it_nexus
= 0, released_regs
= 0;
2885 int prh_type
= 0, prh_scope
= 0;
2888 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
2890 pr_reg_n
= core_scsi3_locate_pr_reg(cmd
->se_dev
, se_sess
->se_node_acl
,
2893 pr_err("SPC-3 PR: Unable to locate"
2894 " PR_REGISTERED *pr_reg for PREEMPT%s\n",
2895 (preempt_type
== PREEMPT_AND_ABORT
) ? "_AND_ABORT" : "");
2896 return TCM_RESERVATION_CONFLICT
;
2898 if (pr_reg_n
->pr_res_key
!= res_key
) {
2899 core_scsi3_put_pr_reg(pr_reg_n
);
2900 return TCM_RESERVATION_CONFLICT
;
2902 if (scope
!= PR_SCOPE_LU_SCOPE
) {
2903 pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope
);
2904 core_scsi3_put_pr_reg(pr_reg_n
);
2905 return TCM_INVALID_PARAMETER_LIST
;
2908 spin_lock(&dev
->dev_reservation_lock
);
2909 pr_res_holder
= dev
->dev_pr_res_holder
;
2910 if (pr_res_holder
&&
2911 ((pr_res_holder
->pr_res_type
== PR_TYPE_WRITE_EXCLUSIVE_ALLREG
) ||
2912 (pr_res_holder
->pr_res_type
== PR_TYPE_EXCLUSIVE_ACCESS_ALLREG
)))
2915 if (!all_reg
&& !sa_res_key
) {
2916 spin_unlock(&dev
->dev_reservation_lock
);
2917 core_scsi3_put_pr_reg(pr_reg_n
);
2918 return TCM_INVALID_PARAMETER_LIST
;
2921 * From spc4r17, section 5.7.11.4.4 Removing Registrations:
2923 * If the SERVICE ACTION RESERVATION KEY field does not identify a
2924 * persistent reservation holder or there is no persistent reservation
2925 * holder (i.e., there is no persistent reservation), then the device
2926 * server shall perform a preempt by doing the following in an
2927 * uninterrupted series of actions. (See below..)
2929 if (!pr_res_holder
|| (pr_res_holder
->pr_res_key
!= sa_res_key
)) {
2931 * No existing or SA Reservation Key matching reservations..
2933 * PROUT SA PREEMPT with All Registrant type reservations are
2934 * allowed to be processed without a matching SA Reservation Key
2936 spin_lock(&pr_tmpl
->registration_lock
);
2937 list_for_each_entry_safe(pr_reg
, pr_reg_tmp
,
2938 &pr_tmpl
->registration_list
, pr_reg_list
) {
2940 * Removing of registrations in non all registrants
2941 * type reservations without a matching SA reservation
2944 * a) Remove the registrations for all I_T nexuses
2945 * specified by the SERVICE ACTION RESERVATION KEY
2947 * b) Ignore the contents of the SCOPE and TYPE fields;
2948 * c) Process tasks as defined in 5.7.1; and
2949 * d) Establish a unit attention condition for the
2950 * initiator port associated with every I_T nexus
2951 * that lost its registration other than the I_T
2952 * nexus on which the PERSISTENT RESERVE OUT command
2953 * was received, with the additional sense code set
2954 * to REGISTRATIONS PREEMPTED.
2957 if (pr_reg
->pr_res_key
!= sa_res_key
)
2960 calling_it_nexus
= (pr_reg_n
== pr_reg
) ? 1 : 0;
2961 pr_reg_nacl
= pr_reg
->pr_reg_nacl
;
2962 pr_res_mapped_lun
= pr_reg
->pr_res_mapped_lun
;
2963 __core_scsi3_free_registration(dev
, pr_reg
,
2964 (preempt_type
== PREEMPT_AND_ABORT
) ? &preempt_and_abort_list
:
2965 NULL
, calling_it_nexus
);
2969 * Case for any existing all registrants type
2970 * reservation, follow logic in spc4r17 section
2971 * 5.7.11.4 Preempting, Table 52 and Figure 7.
2973 * For a ZERO SA Reservation key, release
2974 * all other registrations and do an implict
2975 * release of active persistent reservation.
2977 * For a non-ZERO SA Reservation key, only
2978 * release the matching reservation key from
2982 (pr_reg
->pr_res_key
!= sa_res_key
))
2985 calling_it_nexus
= (pr_reg_n
== pr_reg
) ? 1 : 0;
2986 if (calling_it_nexus
)
2989 pr_reg_nacl
= pr_reg
->pr_reg_nacl
;
2990 pr_res_mapped_lun
= pr_reg
->pr_res_mapped_lun
;
2991 __core_scsi3_free_registration(dev
, pr_reg
,
2992 (preempt_type
== PREEMPT_AND_ABORT
) ? &preempt_and_abort_list
:
2996 if (!calling_it_nexus
)
2997 core_scsi3_ua_allocate(pr_reg_nacl
,
2998 pr_res_mapped_lun
, 0x2A,
2999 ASCQ_2AH_REGISTRATIONS_PREEMPTED
);
3001 spin_unlock(&pr_tmpl
->registration_lock
);
3003 * If a PERSISTENT RESERVE OUT with a PREEMPT service action or
3004 * a PREEMPT AND ABORT service action sets the SERVICE ACTION
3005 * RESERVATION KEY field to a value that does not match any
3006 * registered reservation key, then the device server shall
3007 * complete the command with RESERVATION CONFLICT status.
3009 if (!released_regs
) {
3010 spin_unlock(&dev
->dev_reservation_lock
);
3011 core_scsi3_put_pr_reg(pr_reg_n
);
3012 return TCM_RESERVATION_CONFLICT
;
3015 * For an existing all registrants type reservation
3016 * with a zero SA rservation key, preempt the existing
3017 * reservation with the new PR type and scope.
3019 if (pr_res_holder
&& all_reg
&& !(sa_res_key
)) {
3020 __core_scsi3_complete_pro_preempt(dev
, pr_reg_n
,
3021 (preempt_type
== PREEMPT_AND_ABORT
) ? &preempt_and_abort_list
: NULL
,
3022 type
, scope
, preempt_type
);
3024 if (preempt_type
== PREEMPT_AND_ABORT
)
3025 core_scsi3_release_preempt_and_abort(
3026 &preempt_and_abort_list
, pr_reg_n
);
3028 spin_unlock(&dev
->dev_reservation_lock
);
3030 if (pr_tmpl
->pr_aptpl_active
) {
3031 if (!core_scsi3_update_and_write_aptpl(cmd
->se_dev
,
3032 &pr_reg_n
->pr_aptpl_buf
[0],
3033 pr_tmpl
->pr_aptpl_buf_len
)) {
3034 pr_debug("SPC-3 PR: Updated APTPL"
3035 " metadata for PREEMPT%s\n", (preempt_type
== PREEMPT_AND_ABORT
) ?
3040 core_scsi3_put_pr_reg(pr_reg_n
);
3041 core_scsi3_pr_generation(cmd
->se_dev
);
3045 * The PREEMPTing SA reservation key matches that of the
3046 * existing persistent reservation, first, we check if
3047 * we are preempting our own reservation.
3048 * From spc4r17, section 5.7.11.4.3 Preempting
3049 * persistent reservations and registration handling
3051 * If an all registrants persistent reservation is not
3052 * present, it is not an error for the persistent
3053 * reservation holder to preempt itself (i.e., a
3054 * PERSISTENT RESERVE OUT with a PREEMPT service action
3055 * or a PREEMPT AND ABORT service action with the
3056 * SERVICE ACTION RESERVATION KEY value equal to the
3057 * persistent reservation holder's reservation key that
3058 * is received from the persistent reservation holder).
3059 * In that case, the device server shall establish the
3060 * new persistent reservation and maintain the
3063 prh_type
= pr_res_holder
->pr_res_type
;
3064 prh_scope
= pr_res_holder
->pr_res_scope
;
3066 * If the SERVICE ACTION RESERVATION KEY field identifies a
3067 * persistent reservation holder (see 5.7.10), the device
3068 * server shall perform a preempt by doing the following as
3069 * an uninterrupted series of actions:
3071 * a) Release the persistent reservation for the holder
3072 * identified by the SERVICE ACTION RESERVATION KEY field;
3074 if (pr_reg_n
!= pr_res_holder
)
3075 __core_scsi3_complete_pro_release(dev
,
3076 pr_res_holder
->pr_reg_nacl
,
3077 dev
->dev_pr_res_holder
, 0);
3079 * b) Remove the registrations for all I_T nexuses identified
3080 * by the SERVICE ACTION RESERVATION KEY field, except the
3081 * I_T nexus that is being used for the PERSISTENT RESERVE
3082 * OUT command. If an all registrants persistent reservation
3083 * is present and the SERVICE ACTION RESERVATION KEY field
3084 * is set to zero, then all registrations shall be removed
3085 * except for that of the I_T nexus that is being used for
3086 * the PERSISTENT RESERVE OUT command;
3088 spin_lock(&pr_tmpl
->registration_lock
);
3089 list_for_each_entry_safe(pr_reg
, pr_reg_tmp
,
3090 &pr_tmpl
->registration_list
, pr_reg_list
) {
3092 calling_it_nexus
= (pr_reg_n
== pr_reg
) ? 1 : 0;
3093 if (calling_it_nexus
)
3096 if (pr_reg
->pr_res_key
!= sa_res_key
)
3099 pr_reg_nacl
= pr_reg
->pr_reg_nacl
;
3100 pr_res_mapped_lun
= pr_reg
->pr_res_mapped_lun
;
3101 __core_scsi3_free_registration(dev
, pr_reg
,
3102 (preempt_type
== PREEMPT_AND_ABORT
) ? &preempt_and_abort_list
: NULL
,
3105 * e) Establish a unit attention condition for the initiator
3106 * port associated with every I_T nexus that lost its
3107 * persistent reservation and/or registration, with the
3108 * additional sense code set to REGISTRATIONS PREEMPTED;
3110 core_scsi3_ua_allocate(pr_reg_nacl
, pr_res_mapped_lun
, 0x2A,
3111 ASCQ_2AH_REGISTRATIONS_PREEMPTED
);
3113 spin_unlock(&pr_tmpl
->registration_lock
);
3115 * c) Establish a persistent reservation for the preempting
3116 * I_T nexus using the contents of the SCOPE and TYPE fields;
3118 __core_scsi3_complete_pro_preempt(dev
, pr_reg_n
,
3119 (preempt_type
== PREEMPT_AND_ABORT
) ? &preempt_and_abort_list
: NULL
,
3120 type
, scope
, preempt_type
);
3122 * d) Process tasks as defined in 5.7.1;
3124 * f) If the type or scope has changed, then for every I_T nexus
3125 * whose reservation key was not removed, except for the I_T
3126 * nexus on which the PERSISTENT RESERVE OUT command was
3127 * received, the device server shall establish a unit
3128 * attention condition for the initiator port associated with
3129 * that I_T nexus, with the additional sense code set to
3130 * RESERVATIONS RELEASED. If the type or scope have not
3131 * changed, then no unit attention condition(s) shall be
3132 * established for this reason.
3134 if ((prh_type
!= type
) || (prh_scope
!= scope
)) {
3135 spin_lock(&pr_tmpl
->registration_lock
);
3136 list_for_each_entry_safe(pr_reg
, pr_reg_tmp
,
3137 &pr_tmpl
->registration_list
, pr_reg_list
) {
3139 calling_it_nexus
= (pr_reg_n
== pr_reg
) ? 1 : 0;
3140 if (calling_it_nexus
)
3143 core_scsi3_ua_allocate(pr_reg
->pr_reg_nacl
,
3144 pr_reg
->pr_res_mapped_lun
, 0x2A,
3145 ASCQ_2AH_RESERVATIONS_RELEASED
);
3147 spin_unlock(&pr_tmpl
->registration_lock
);
3149 spin_unlock(&dev
->dev_reservation_lock
);
3151 * Call LUN_RESET logic upon list of struct t10_pr_registration,
3152 * All received CDBs for the matching existing reservation and
3153 * registrations undergo ABORT_TASK logic.
3155 * From there, core_scsi3_release_preempt_and_abort() will
3156 * release every registration in the list (which have already
3157 * been removed from the primary pr_reg list), except the
3158 * new persistent reservation holder, the calling Initiator Port.
3160 if (preempt_type
== PREEMPT_AND_ABORT
) {
3161 core_tmr_lun_reset(dev
, NULL
, &preempt_and_abort_list
, cmd
);
3162 core_scsi3_release_preempt_and_abort(&preempt_and_abort_list
,
3166 if (pr_tmpl
->pr_aptpl_active
) {
3167 if (!core_scsi3_update_and_write_aptpl(cmd
->se_dev
,
3168 &pr_reg_n
->pr_aptpl_buf
[0],
3169 pr_tmpl
->pr_aptpl_buf_len
)) {
3170 pr_debug("SPC-3 PR: Updated APTPL metadata for PREEMPT"
3171 "%s\n", (preempt_type
== PREEMPT_AND_ABORT
) ? "_AND_ABORT" : "");
3175 core_scsi3_put_pr_reg(pr_reg_n
);
3176 core_scsi3_pr_generation(cmd
->se_dev
);
3180 static sense_reason_t
3181 core_scsi3_emulate_pro_preempt(struct se_cmd
*cmd
, int type
, int scope
,
3182 u64 res_key
, u64 sa_res_key
, enum preempt_type preempt_type
)
3185 case PR_TYPE_WRITE_EXCLUSIVE
:
3186 case PR_TYPE_EXCLUSIVE_ACCESS
:
3187 case PR_TYPE_WRITE_EXCLUSIVE_REGONLY
:
3188 case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY
:
3189 case PR_TYPE_WRITE_EXCLUSIVE_ALLREG
:
3190 case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG
:
3191 return core_scsi3_pro_preempt(cmd
, type
, scope
, res_key
,
3192 sa_res_key
, preempt_type
);
3194 pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
3195 " Type: 0x%02x\n", (preempt_type
== PREEMPT_AND_ABORT
) ? "_AND_ABORT" : "", type
);
3196 return TCM_INVALID_CDB_FIELD
;
3201 static sense_reason_t
3202 core_scsi3_emulate_pro_register_and_move(struct se_cmd
*cmd
, u64 res_key
,
3203 u64 sa_res_key
, int aptpl
, int unreg
)
3205 struct se_session
*se_sess
= cmd
->se_sess
;
3206 struct se_device
*dev
= cmd
->se_dev
;
3207 struct se_dev_entry
*dest_se_deve
= NULL
;
3208 struct se_lun
*se_lun
= cmd
->se_lun
;
3209 struct se_node_acl
*pr_res_nacl
, *pr_reg_nacl
, *dest_node_acl
= NULL
;
3210 struct se_port
*se_port
;
3211 struct se_portal_group
*se_tpg
, *dest_se_tpg
= NULL
;
3212 struct target_core_fabric_ops
*dest_tf_ops
= NULL
, *tf_ops
;
3213 struct t10_pr_registration
*pr_reg
, *pr_res_holder
, *dest_pr_reg
;
3214 struct t10_reservation
*pr_tmpl
= &dev
->t10_pr
;
3216 unsigned char *initiator_str
;
3217 char *iport_ptr
= NULL
, dest_iport
[64], i_buf
[PR_REG_ISID_ID_LEN
];
3218 u32 tid_len
, tmp_tid_len
;
3219 int new_reg
= 0, type
, scope
, matching_iname
;
3221 unsigned short rtpi
;
3222 unsigned char proto_ident
;
3224 if (!se_sess
|| !se_lun
) {
3225 pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
3226 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3229 memset(dest_iport
, 0, 64);
3230 memset(i_buf
, 0, PR_REG_ISID_ID_LEN
);
3231 se_tpg
= se_sess
->se_tpg
;
3232 tf_ops
= se_tpg
->se_tpg_tfo
;
3234 * Follow logic from spc4r17 Section 5.7.8, Table 50 --
3235 * Register behaviors for a REGISTER AND MOVE service action
3237 * Locate the existing *pr_reg via struct se_node_acl pointers
3239 pr_reg
= core_scsi3_locate_pr_reg(cmd
->se_dev
, se_sess
->se_node_acl
,
3242 pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
3243 " *pr_reg for REGISTER_AND_MOVE\n");
3244 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3247 * The provided reservation key much match the existing reservation key
3248 * provided during this initiator's I_T nexus registration.
3250 if (res_key
!= pr_reg
->pr_res_key
) {
3251 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
3252 " res_key: 0x%016Lx does not match existing SA REGISTER"
3253 " res_key: 0x%016Lx\n", res_key
, pr_reg
->pr_res_key
);
3254 ret
= TCM_RESERVATION_CONFLICT
;
3255 goto out_put_pr_reg
;
3258 * The service active reservation key needs to be non zero
3261 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
3263 ret
= TCM_INVALID_PARAMETER_LIST
;
3264 goto out_put_pr_reg
;
3268 * Determine the Relative Target Port Identifier where the reservation
3269 * will be moved to for the TransportID containing SCSI initiator WWN
3272 buf
= transport_kmap_data_sg(cmd
);
3274 ret
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3275 goto out_put_pr_reg
;
3278 rtpi
= (buf
[18] & 0xff) << 8;
3279 rtpi
|= buf
[19] & 0xff;
3280 tid_len
= (buf
[20] & 0xff) << 24;
3281 tid_len
|= (buf
[21] & 0xff) << 16;
3282 tid_len
|= (buf
[22] & 0xff) << 8;
3283 tid_len
|= buf
[23] & 0xff;
3284 transport_kunmap_data_sg(cmd
);
3287 if ((tid_len
+ 24) != cmd
->data_length
) {
3288 pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
3289 " does not equal CDB data_length: %u\n", tid_len
,
3291 ret
= TCM_INVALID_PARAMETER_LIST
;
3292 goto out_put_pr_reg
;
3295 spin_lock(&dev
->se_port_lock
);
3296 list_for_each_entry(se_port
, &dev
->dev_sep_list
, sep_list
) {
3297 if (se_port
->sep_rtpi
!= rtpi
)
3299 dest_se_tpg
= se_port
->sep_tpg
;
3302 dest_tf_ops
= dest_se_tpg
->se_tpg_tfo
;
3306 atomic_inc(&dest_se_tpg
->tpg_pr_ref_count
);
3307 smp_mb__after_atomic_inc();
3308 spin_unlock(&dev
->se_port_lock
);
3310 if (core_scsi3_tpg_depend_item(dest_se_tpg
)) {
3311 pr_err("core_scsi3_tpg_depend_item() failed"
3312 " for dest_se_tpg\n");
3313 atomic_dec(&dest_se_tpg
->tpg_pr_ref_count
);
3314 smp_mb__after_atomic_dec();
3315 ret
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3316 goto out_put_pr_reg
;
3319 spin_lock(&dev
->se_port_lock
);
3322 spin_unlock(&dev
->se_port_lock
);
3324 if (!dest_se_tpg
|| !dest_tf_ops
) {
3325 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3326 " fabric ops from Relative Target Port Identifier:"
3328 ret
= TCM_INVALID_PARAMETER_LIST
;
3329 goto out_put_pr_reg
;
3332 buf
= transport_kmap_data_sg(cmd
);
3334 ret
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3335 goto out_put_pr_reg
;
3337 proto_ident
= (buf
[24] & 0x0f);
3339 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
3340 " 0x%02x\n", proto_ident
);
3342 if (proto_ident
!= dest_tf_ops
->get_fabric_proto_ident(dest_se_tpg
)) {
3343 pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
3344 " proto_ident: 0x%02x does not match ident: 0x%02x"
3345 " from fabric: %s\n", proto_ident
,
3346 dest_tf_ops
->get_fabric_proto_ident(dest_se_tpg
),
3347 dest_tf_ops
->get_fabric_name());
3348 ret
= TCM_INVALID_PARAMETER_LIST
;
3351 if (dest_tf_ops
->tpg_parse_pr_out_transport_id
== NULL
) {
3352 pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not"
3353 " containg a valid tpg_parse_pr_out_transport_id"
3354 " function pointer\n");
3355 ret
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3358 initiator_str
= dest_tf_ops
->tpg_parse_pr_out_transport_id(dest_se_tpg
,
3359 (const char *)&buf
[24], &tmp_tid_len
, &iport_ptr
);
3360 if (!initiator_str
) {
3361 pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
3362 " initiator_str from Transport ID\n");
3363 ret
= TCM_INVALID_PARAMETER_LIST
;
3367 transport_kunmap_data_sg(cmd
);
3370 pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
3371 " %s\n", dest_tf_ops
->get_fabric_name(), (iport_ptr
!= NULL
) ?
3372 "port" : "device", initiator_str
, (iport_ptr
!= NULL
) ?
3375 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3376 * action specifies a TransportID that is the same as the initiator port
3377 * of the I_T nexus for the command received, then the command shall
3378 * be terminated with CHECK CONDITION status, with the sense key set to
3379 * ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
3380 * IN PARAMETER LIST.
3382 pr_reg_nacl
= pr_reg
->pr_reg_nacl
;
3383 matching_iname
= (!strcmp(initiator_str
,
3384 pr_reg_nacl
->initiatorname
)) ? 1 : 0;
3385 if (!matching_iname
)
3386 goto after_iport_check
;
3388 if (!iport_ptr
|| !pr_reg
->isid_present_at_reg
) {
3389 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
3390 " matches: %s on received I_T Nexus\n", initiator_str
,
3391 pr_reg_nacl
->initiatorname
);
3392 ret
= TCM_INVALID_PARAMETER_LIST
;
3395 if (!strcmp(iport_ptr
, pr_reg
->pr_reg_isid
)) {
3396 pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
3397 " matches: %s %s on received I_T Nexus\n",
3398 initiator_str
, iport_ptr
, pr_reg_nacl
->initiatorname
,
3399 pr_reg
->pr_reg_isid
);
3400 ret
= TCM_INVALID_PARAMETER_LIST
;
3405 * Locate the destination struct se_node_acl from the received Transport ID
3407 spin_lock_irq(&dest_se_tpg
->acl_node_lock
);
3408 dest_node_acl
= __core_tpg_get_initiator_node_acl(dest_se_tpg
,
3410 if (dest_node_acl
) {
3411 atomic_inc(&dest_node_acl
->acl_pr_ref_count
);
3412 smp_mb__after_atomic_inc();
3414 spin_unlock_irq(&dest_se_tpg
->acl_node_lock
);
3416 if (!dest_node_acl
) {
3417 pr_err("Unable to locate %s dest_node_acl for"
3418 " TransportID%s\n", dest_tf_ops
->get_fabric_name(),
3420 ret
= TCM_INVALID_PARAMETER_LIST
;
3424 if (core_scsi3_nodeacl_depend_item(dest_node_acl
)) {
3425 pr_err("core_scsi3_nodeacl_depend_item() for"
3426 " dest_node_acl\n");
3427 atomic_dec(&dest_node_acl
->acl_pr_ref_count
);
3428 smp_mb__after_atomic_dec();
3429 dest_node_acl
= NULL
;
3430 ret
= TCM_INVALID_PARAMETER_LIST
;
3434 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
3435 " %s from TransportID\n", dest_tf_ops
->get_fabric_name(),
3436 dest_node_acl
->initiatorname
);
3439 * Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
3442 dest_se_deve
= core_get_se_deve_from_rtpi(dest_node_acl
, rtpi
);
3443 if (!dest_se_deve
) {
3444 pr_err("Unable to locate %s dest_se_deve from RTPI:"
3445 " %hu\n", dest_tf_ops
->get_fabric_name(), rtpi
);
3446 ret
= TCM_INVALID_PARAMETER_LIST
;
3450 if (core_scsi3_lunacl_depend_item(dest_se_deve
)) {
3451 pr_err("core_scsi3_lunacl_depend_item() failed\n");
3452 atomic_dec(&dest_se_deve
->pr_ref_count
);
3453 smp_mb__after_atomic_dec();
3454 dest_se_deve
= NULL
;
3455 ret
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3459 pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
3460 " ACL for dest_se_deve->mapped_lun: %u\n",
3461 dest_tf_ops
->get_fabric_name(), dest_node_acl
->initiatorname
,
3462 dest_se_deve
->mapped_lun
);
3465 * A persistent reservation needs to already existing in order to
3466 * successfully complete the REGISTER_AND_MOVE service action..
3468 spin_lock(&dev
->dev_reservation_lock
);
3469 pr_res_holder
= dev
->dev_pr_res_holder
;
3470 if (!pr_res_holder
) {
3471 pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
3472 " currently held\n");
3473 spin_unlock(&dev
->dev_reservation_lock
);
3474 ret
= TCM_INVALID_CDB_FIELD
;
3478 * The received on I_T Nexus must be the reservation holder.
3480 * From spc4r17 section 5.7.8 Table 50 --
3481 * Register behaviors for a REGISTER AND MOVE service action
3483 if (pr_res_holder
!= pr_reg
) {
3484 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
3485 " Nexus is not reservation holder\n");
3486 spin_unlock(&dev
->dev_reservation_lock
);
3487 ret
= TCM_RESERVATION_CONFLICT
;
3491 * From spc4r17 section 5.7.8: registering and moving reservation
3493 * If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
3494 * action is received and the established persistent reservation is a
3495 * Write Exclusive - All Registrants type or Exclusive Access -
3496 * All Registrants type reservation, then the command shall be completed
3497 * with RESERVATION CONFLICT status.
3499 if ((pr_res_holder
->pr_res_type
== PR_TYPE_WRITE_EXCLUSIVE_ALLREG
) ||
3500 (pr_res_holder
->pr_res_type
== PR_TYPE_EXCLUSIVE_ACCESS_ALLREG
)) {
3501 pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
3502 " reservation for type: %s\n",
3503 core_scsi3_pr_dump_type(pr_res_holder
->pr_res_type
));
3504 spin_unlock(&dev
->dev_reservation_lock
);
3505 ret
= TCM_RESERVATION_CONFLICT
;
3508 pr_res_nacl
= pr_res_holder
->pr_reg_nacl
;
3510 * b) Ignore the contents of the (received) SCOPE and TYPE fields;
3512 type
= pr_res_holder
->pr_res_type
;
3513 scope
= pr_res_holder
->pr_res_type
;
3515 * c) Associate the reservation key specified in the SERVICE ACTION
3516 * RESERVATION KEY field with the I_T nexus specified as the
3517 * destination of the register and move, where:
3518 * A) The I_T nexus is specified by the TransportID and the
3519 * RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
3520 * B) Regardless of the TransportID format used, the association for
3521 * the initiator port is based on either the initiator port name
3522 * (see 3.1.71) on SCSI transport protocols where port names are
3523 * required or the initiator port identifier (see 3.1.70) on SCSI
3524 * transport protocols where port names are not required;
3525 * d) Register the reservation key specified in the SERVICE ACTION
3526 * RESERVATION KEY field;
3527 * e) Retain the reservation key specified in the SERVICE ACTION
3528 * RESERVATION KEY field and associated information;
3530 * Also, It is not an error for a REGISTER AND MOVE service action to
3531 * register an I_T nexus that is already registered with the same
3532 * reservation key or a different reservation key.
3534 dest_pr_reg
= __core_scsi3_locate_pr_reg(dev
, dest_node_acl
,
3537 if (core_scsi3_alloc_registration(cmd
->se_dev
,
3538 dest_node_acl
, dest_se_deve
, iport_ptr
,
3539 sa_res_key
, 0, aptpl
, 2, 1)) {
3540 spin_unlock(&dev
->dev_reservation_lock
);
3541 ret
= TCM_INVALID_PARAMETER_LIST
;
3544 dest_pr_reg
= __core_scsi3_locate_pr_reg(dev
, dest_node_acl
,
3549 * f) Release the persistent reservation for the persistent reservation
3550 * holder (i.e., the I_T nexus on which the
3552 __core_scsi3_complete_pro_release(dev
, pr_res_nacl
,
3553 dev
->dev_pr_res_holder
, 0);
3555 * g) Move the persistent reservation to the specified I_T nexus using
3556 * the same scope and type as the persistent reservation released in
3559 dev
->dev_pr_res_holder
= dest_pr_reg
;
3560 dest_pr_reg
->pr_res_holder
= 1;
3561 dest_pr_reg
->pr_res_type
= type
;
3562 pr_reg
->pr_res_scope
= scope
;
3563 core_pr_dump_initiator_port(pr_reg
, i_buf
, PR_REG_ISID_ID_LEN
);
3565 * Increment PRGeneration for existing registrations..
3568 dest_pr_reg
->pr_res_generation
= pr_tmpl
->pr_generation
++;
3569 spin_unlock(&dev
->dev_reservation_lock
);
3571 pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
3572 " created new reservation holder TYPE: %s on object RTPI:"
3573 " %hu PRGeneration: 0x%08x\n", dest_tf_ops
->get_fabric_name(),
3574 core_scsi3_pr_dump_type(type
), rtpi
,
3575 dest_pr_reg
->pr_res_generation
);
3576 pr_debug("SPC-3 PR Successfully moved reservation from"
3577 " %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
3578 tf_ops
->get_fabric_name(), pr_reg_nacl
->initiatorname
,
3579 i_buf
, dest_tf_ops
->get_fabric_name(),
3580 dest_node_acl
->initiatorname
, (iport_ptr
!= NULL
) ?
3583 * It is now safe to release configfs group dependencies for destination
3584 * of Transport ID Initiator Device/Port Identifier
3586 core_scsi3_lunacl_undepend_item(dest_se_deve
);
3587 core_scsi3_nodeacl_undepend_item(dest_node_acl
);
3588 core_scsi3_tpg_undepend_item(dest_se_tpg
);
3590 * h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
3591 * nexus on which PERSISTENT RESERVE OUT command was received.
3594 spin_lock(&pr_tmpl
->registration_lock
);
3595 __core_scsi3_free_registration(dev
, pr_reg
, NULL
, 1);
3596 spin_unlock(&pr_tmpl
->registration_lock
);
3598 core_scsi3_put_pr_reg(pr_reg
);
3601 * Clear the APTPL metadata if APTPL has been disabled, otherwise
3602 * write out the updated metadata to struct file for this SCSI device.
3605 pr_tmpl
->pr_aptpl_active
= 0;
3606 core_scsi3_update_and_write_aptpl(cmd
->se_dev
, NULL
, 0);
3607 pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
3608 " REGISTER_AND_MOVE\n");
3610 pr_tmpl
->pr_aptpl_active
= 1;
3611 if (!core_scsi3_update_and_write_aptpl(cmd
->se_dev
,
3612 &dest_pr_reg
->pr_aptpl_buf
[0],
3613 pr_tmpl
->pr_aptpl_buf_len
)) {
3614 pr_debug("SPC-3 PR: Set APTPL Bit Activated for"
3615 " REGISTER_AND_MOVE\n");
3619 transport_kunmap_data_sg(cmd
);
3621 core_scsi3_put_pr_reg(dest_pr_reg
);
3625 transport_kunmap_data_sg(cmd
);
3627 core_scsi3_lunacl_undepend_item(dest_se_deve
);
3629 core_scsi3_nodeacl_undepend_item(dest_node_acl
);
3630 core_scsi3_tpg_undepend_item(dest_se_tpg
);
3633 core_scsi3_put_pr_reg(pr_reg
);
3637 static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb
)
3639 unsigned int __v1
, __v2
;
3641 __v1
= (cdb
[0] << 24) | (cdb
[1] << 16) | (cdb
[2] << 8) | cdb
[3];
3642 __v2
= (cdb
[4] << 24) | (cdb
[5] << 16) | (cdb
[6] << 8) | cdb
[7];
3644 return ((unsigned long long)__v2
) | (unsigned long long)__v1
<< 32;
3648 * See spc4r17 section 6.14 Table 170
3651 target_scsi3_emulate_pr_out(struct se_cmd
*cmd
)
3653 unsigned char *cdb
= &cmd
->t_task_cdb
[0];
3655 u64 res_key
, sa_res_key
;
3656 int sa
, scope
, type
, aptpl
;
3657 int spec_i_pt
= 0, all_tg_pt
= 0, unreg
= 0;
3661 * Following spc2r20 5.5.1 Reservations overview:
3663 * If a logical unit has been reserved by any RESERVE command and is
3664 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
3665 * PERSISTENT RESERVE OUT commands shall conflict regardless of
3666 * initiator or service action and shall terminate with a RESERVATION
3669 if (cmd
->se_dev
->dev_reservation_flags
& DRF_SPC2_RESERVATIONS
) {
3670 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
3671 " SPC-2 reservation is held, returning"
3672 " RESERVATION_CONFLICT\n");
3673 return TCM_RESERVATION_CONFLICT
;
3677 * FIXME: A NULL struct se_session pointer means an this is not coming from
3678 * a $FABRIC_MOD's nexus, but from internal passthrough ops.
3681 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3683 if (cmd
->data_length
< 24) {
3684 pr_warn("SPC-PR: Received PR OUT parameter list"
3685 " length too small: %u\n", cmd
->data_length
);
3686 return TCM_INVALID_PARAMETER_LIST
;
3690 * From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
3692 sa
= (cdb
[1] & 0x1f);
3693 scope
= (cdb
[2] & 0xf0);
3694 type
= (cdb
[2] & 0x0f);
3696 buf
= transport_kmap_data_sg(cmd
);
3698 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3701 * From PERSISTENT_RESERVE_OUT parameter list (payload)
3703 res_key
= core_scsi3_extract_reservation_key(&buf
[0]);
3704 sa_res_key
= core_scsi3_extract_reservation_key(&buf
[8]);
3706 * REGISTER_AND_MOVE uses a different SA parameter list containing
3707 * SCSI TransportIDs.
3709 if (sa
!= PRO_REGISTER_AND_MOVE
) {
3710 spec_i_pt
= (buf
[20] & 0x08);
3711 all_tg_pt
= (buf
[20] & 0x04);
3712 aptpl
= (buf
[20] & 0x01);
3714 aptpl
= (buf
[17] & 0x01);
3715 unreg
= (buf
[17] & 0x02);
3717 transport_kunmap_data_sg(cmd
);
3721 * SPEC_I_PT=1 is only valid for Service action: REGISTER
3723 if (spec_i_pt
&& ((cdb
[1] & 0x1f) != PRO_REGISTER
))
3724 return TCM_INVALID_PARAMETER_LIST
;
3727 * From spc4r17 section 6.14:
3729 * If the SPEC_I_PT bit is set to zero, the service action is not
3730 * REGISTER AND MOVE, and the parameter list length is not 24, then
3731 * the command shall be terminated with CHECK CONDITION status, with
3732 * the sense key set to ILLEGAL REQUEST, and the additional sense
3733 * code set to PARAMETER LIST LENGTH ERROR.
3735 if (!spec_i_pt
&& ((cdb
[1] & 0x1f) != PRO_REGISTER_AND_MOVE
) &&
3736 (cmd
->data_length
!= 24)) {
3737 pr_warn("SPC-PR: Received PR OUT illegal parameter"
3738 " list length: %u\n", cmd
->data_length
);
3739 return TCM_INVALID_PARAMETER_LIST
;
3743 * (core_scsi3_emulate_pro_* function parameters
3744 * are defined by spc4r17 Table 174:
3745 * PERSISTENT_RESERVE_OUT service actions and valid parameters.
3749 ret
= core_scsi3_emulate_pro_register(cmd
,
3750 res_key
, sa_res_key
, aptpl
, all_tg_pt
, spec_i_pt
, REGISTER
);
3753 ret
= core_scsi3_emulate_pro_reserve(cmd
, type
, scope
, res_key
);
3756 ret
= core_scsi3_emulate_pro_release(cmd
, type
, scope
, res_key
);
3759 ret
= core_scsi3_emulate_pro_clear(cmd
, res_key
);
3762 ret
= core_scsi3_emulate_pro_preempt(cmd
, type
, scope
,
3763 res_key
, sa_res_key
, PREEMPT
);
3765 case PRO_PREEMPT_AND_ABORT
:
3766 ret
= core_scsi3_emulate_pro_preempt(cmd
, type
, scope
,
3767 res_key
, sa_res_key
, PREEMPT_AND_ABORT
);
3769 case PRO_REGISTER_AND_IGNORE_EXISTING_KEY
:
3770 ret
= core_scsi3_emulate_pro_register(cmd
,
3771 0, sa_res_key
, aptpl
, all_tg_pt
, spec_i_pt
, REGISTER_AND_IGNORE_EXISTING_KEY
);
3773 case PRO_REGISTER_AND_MOVE
:
3774 ret
= core_scsi3_emulate_pro_register_and_move(cmd
, res_key
,
3775 sa_res_key
, aptpl
, unreg
);
3778 pr_err("Unknown PERSISTENT_RESERVE_OUT service"
3779 " action: 0x%02x\n", cdb
[1] & 0x1f);
3780 return TCM_INVALID_CDB_FIELD
;
3784 target_complete_cmd(cmd
, GOOD
);
3789 * PERSISTENT_RESERVE_IN Service Action READ_KEYS
3791 * See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
3793 static sense_reason_t
3794 core_scsi3_pri_read_keys(struct se_cmd
*cmd
)
3796 struct se_device
*dev
= cmd
->se_dev
;
3797 struct t10_pr_registration
*pr_reg
;
3799 u32 add_len
= 0, off
= 8;
3801 if (cmd
->data_length
< 8) {
3802 pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
3803 " too small\n", cmd
->data_length
);
3804 return TCM_INVALID_CDB_FIELD
;
3807 buf
= transport_kmap_data_sg(cmd
);
3809 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3811 buf
[0] = ((dev
->t10_pr
.pr_generation
>> 24) & 0xff);
3812 buf
[1] = ((dev
->t10_pr
.pr_generation
>> 16) & 0xff);
3813 buf
[2] = ((dev
->t10_pr
.pr_generation
>> 8) & 0xff);
3814 buf
[3] = (dev
->t10_pr
.pr_generation
& 0xff);
3816 spin_lock(&dev
->t10_pr
.registration_lock
);
3817 list_for_each_entry(pr_reg
, &dev
->t10_pr
.registration_list
,
3820 * Check for overflow of 8byte PRI READ_KEYS payload and
3821 * next reservation key list descriptor.
3823 if ((add_len
+ 8) > (cmd
->data_length
- 8))
3826 buf
[off
++] = ((pr_reg
->pr_res_key
>> 56) & 0xff);
3827 buf
[off
++] = ((pr_reg
->pr_res_key
>> 48) & 0xff);
3828 buf
[off
++] = ((pr_reg
->pr_res_key
>> 40) & 0xff);
3829 buf
[off
++] = ((pr_reg
->pr_res_key
>> 32) & 0xff);
3830 buf
[off
++] = ((pr_reg
->pr_res_key
>> 24) & 0xff);
3831 buf
[off
++] = ((pr_reg
->pr_res_key
>> 16) & 0xff);
3832 buf
[off
++] = ((pr_reg
->pr_res_key
>> 8) & 0xff);
3833 buf
[off
++] = (pr_reg
->pr_res_key
& 0xff);
3837 spin_unlock(&dev
->t10_pr
.registration_lock
);
3839 buf
[4] = ((add_len
>> 24) & 0xff);
3840 buf
[5] = ((add_len
>> 16) & 0xff);
3841 buf
[6] = ((add_len
>> 8) & 0xff);
3842 buf
[7] = (add_len
& 0xff);
3844 transport_kunmap_data_sg(cmd
);
3850 * PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
3852 * See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
3854 static sense_reason_t
3855 core_scsi3_pri_read_reservation(struct se_cmd
*cmd
)
3857 struct se_device
*dev
= cmd
->se_dev
;
3858 struct t10_pr_registration
*pr_reg
;
3861 u32 add_len
= 16; /* Hardcoded to 16 when a reservation is held. */
3863 if (cmd
->data_length
< 8) {
3864 pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
3865 " too small\n", cmd
->data_length
);
3866 return TCM_INVALID_CDB_FIELD
;
3869 buf
= transport_kmap_data_sg(cmd
);
3871 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3873 buf
[0] = ((dev
->t10_pr
.pr_generation
>> 24) & 0xff);
3874 buf
[1] = ((dev
->t10_pr
.pr_generation
>> 16) & 0xff);
3875 buf
[2] = ((dev
->t10_pr
.pr_generation
>> 8) & 0xff);
3876 buf
[3] = (dev
->t10_pr
.pr_generation
& 0xff);
3878 spin_lock(&dev
->dev_reservation_lock
);
3879 pr_reg
= dev
->dev_pr_res_holder
;
3882 * Set the hardcoded Additional Length
3884 buf
[4] = ((add_len
>> 24) & 0xff);
3885 buf
[5] = ((add_len
>> 16) & 0xff);
3886 buf
[6] = ((add_len
>> 8) & 0xff);
3887 buf
[7] = (add_len
& 0xff);
3889 if (cmd
->data_length
< 22)
3893 * Set the Reservation key.
3895 * From spc4r17, section 5.7.10:
3896 * A persistent reservation holder has its reservation key
3897 * returned in the parameter data from a PERSISTENT
3898 * RESERVE IN command with READ RESERVATION service action as
3900 * a) For a persistent reservation of the type Write Exclusive
3901 * - All Registrants or Exclusive Access  All Regitrants,
3902 * the reservation key shall be set to zero; or
3903 * b) For all other persistent reservation types, the
3904 * reservation key shall be set to the registered
3905 * reservation key for the I_T nexus that holds the
3906 * persistent reservation.
3908 if ((pr_reg
->pr_res_type
== PR_TYPE_WRITE_EXCLUSIVE_ALLREG
) ||
3909 (pr_reg
->pr_res_type
== PR_TYPE_EXCLUSIVE_ACCESS_ALLREG
))
3912 pr_res_key
= pr_reg
->pr_res_key
;
3914 buf
[8] = ((pr_res_key
>> 56) & 0xff);
3915 buf
[9] = ((pr_res_key
>> 48) & 0xff);
3916 buf
[10] = ((pr_res_key
>> 40) & 0xff);
3917 buf
[11] = ((pr_res_key
>> 32) & 0xff);
3918 buf
[12] = ((pr_res_key
>> 24) & 0xff);
3919 buf
[13] = ((pr_res_key
>> 16) & 0xff);
3920 buf
[14] = ((pr_res_key
>> 8) & 0xff);
3921 buf
[15] = (pr_res_key
& 0xff);
3923 * Set the SCOPE and TYPE
3925 buf
[21] = (pr_reg
->pr_res_scope
& 0xf0) |
3926 (pr_reg
->pr_res_type
& 0x0f);
3930 spin_unlock(&dev
->dev_reservation_lock
);
3931 transport_kunmap_data_sg(cmd
);
3937 * PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
3939 * See spc4r17 section 6.13.4 Table 165
3941 static sense_reason_t
3942 core_scsi3_pri_report_capabilities(struct se_cmd
*cmd
)
3944 struct se_device
*dev
= cmd
->se_dev
;
3945 struct t10_reservation
*pr_tmpl
= &dev
->t10_pr
;
3947 u16 add_len
= 8; /* Hardcoded to 8. */
3949 if (cmd
->data_length
< 6) {
3950 pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
3951 " %u too small\n", cmd
->data_length
);
3952 return TCM_INVALID_CDB_FIELD
;
3955 buf
= transport_kmap_data_sg(cmd
);
3957 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
3959 buf
[0] = ((add_len
<< 8) & 0xff);
3960 buf
[1] = (add_len
& 0xff);
3961 buf
[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
3962 buf
[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
3963 buf
[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
3964 buf
[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
3966 * We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
3967 * set the TMV: Task Mask Valid bit.
3971 * Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
3973 buf
[3] |= 0x10; /* ALLOW COMMANDs field 001b */
3975 * PTPL_A: Persistence across Target Power Loss Active bit
3977 if (pr_tmpl
->pr_aptpl_active
)
3980 * Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
3982 buf
[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3983 buf
[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
3984 buf
[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
3985 buf
[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
3986 buf
[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
3987 buf
[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
3989 transport_kunmap_data_sg(cmd
);
3995 * PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
3997 * See spc4r17 section 6.13.5 Table 168 and 169
3999 static sense_reason_t
4000 core_scsi3_pri_read_full_status(struct se_cmd
*cmd
)
4002 struct se_device
*dev
= cmd
->se_dev
;
4003 struct se_node_acl
*se_nacl
;
4004 struct se_portal_group
*se_tpg
;
4005 struct t10_pr_registration
*pr_reg
, *pr_reg_tmp
;
4006 struct t10_reservation
*pr_tmpl
= &dev
->t10_pr
;
4008 u32 add_desc_len
= 0, add_len
= 0, desc_len
, exp_desc_len
;
4009 u32 off
= 8; /* off into first Full Status descriptor */
4010 int format_code
= 0;
4012 if (cmd
->data_length
< 8) {
4013 pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
4014 " too small\n", cmd
->data_length
);
4015 return TCM_INVALID_CDB_FIELD
;
4018 buf
= transport_kmap_data_sg(cmd
);
4020 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
4022 buf
[0] = ((dev
->t10_pr
.pr_generation
>> 24) & 0xff);
4023 buf
[1] = ((dev
->t10_pr
.pr_generation
>> 16) & 0xff);
4024 buf
[2] = ((dev
->t10_pr
.pr_generation
>> 8) & 0xff);
4025 buf
[3] = (dev
->t10_pr
.pr_generation
& 0xff);
4027 spin_lock(&pr_tmpl
->registration_lock
);
4028 list_for_each_entry_safe(pr_reg
, pr_reg_tmp
,
4029 &pr_tmpl
->registration_list
, pr_reg_list
) {
4031 se_nacl
= pr_reg
->pr_reg_nacl
;
4032 se_tpg
= pr_reg
->pr_reg_nacl
->se_tpg
;
4035 atomic_inc(&pr_reg
->pr_res_holders
);
4036 smp_mb__after_atomic_inc();
4037 spin_unlock(&pr_tmpl
->registration_lock
);
4039 * Determine expected length of $FABRIC_MOD specific
4040 * TransportID full status descriptor..
4042 exp_desc_len
= se_tpg
->se_tpg_tfo
->tpg_get_pr_transport_id_len(
4043 se_tpg
, se_nacl
, pr_reg
, &format_code
);
4045 if ((exp_desc_len
+ add_len
) > cmd
->data_length
) {
4046 pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
4047 " out of buffer: %d\n", cmd
->data_length
);
4048 spin_lock(&pr_tmpl
->registration_lock
);
4049 atomic_dec(&pr_reg
->pr_res_holders
);
4050 smp_mb__after_atomic_dec();
4054 * Set RESERVATION KEY
4056 buf
[off
++] = ((pr_reg
->pr_res_key
>> 56) & 0xff);
4057 buf
[off
++] = ((pr_reg
->pr_res_key
>> 48) & 0xff);
4058 buf
[off
++] = ((pr_reg
->pr_res_key
>> 40) & 0xff);
4059 buf
[off
++] = ((pr_reg
->pr_res_key
>> 32) & 0xff);
4060 buf
[off
++] = ((pr_reg
->pr_res_key
>> 24) & 0xff);
4061 buf
[off
++] = ((pr_reg
->pr_res_key
>> 16) & 0xff);
4062 buf
[off
++] = ((pr_reg
->pr_res_key
>> 8) & 0xff);
4063 buf
[off
++] = (pr_reg
->pr_res_key
& 0xff);
4064 off
+= 4; /* Skip Over Reserved area */
4067 * Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
4069 if (pr_reg
->pr_reg_all_tg_pt
)
4072 * The struct se_lun pointer will be present for the
4073 * reservation holder for PR_HOLDER bit.
4075 * Also, if this registration is the reservation
4076 * holder, fill in SCOPE and TYPE in the next byte.
4078 if (pr_reg
->pr_res_holder
) {
4080 buf
[off
++] = (pr_reg
->pr_res_scope
& 0xf0) |
4081 (pr_reg
->pr_res_type
& 0x0f);
4085 off
+= 4; /* Skip over reserved area */
4087 * From spc4r17 6.3.15:
4089 * If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
4090 * IDENTIFIER field contains the relative port identifier (see
4091 * 3.1.120) of the target port that is part of the I_T nexus
4092 * described by this full status descriptor. If the ALL_TG_PT
4093 * bit is set to one, the contents of the RELATIVE TARGET PORT
4094 * IDENTIFIER field are not defined by this standard.
4096 if (!pr_reg
->pr_reg_all_tg_pt
) {
4097 struct se_port
*port
= pr_reg
->pr_reg_tg_pt_lun
->lun_sep
;
4099 buf
[off
++] = ((port
->sep_rtpi
>> 8) & 0xff);
4100 buf
[off
++] = (port
->sep_rtpi
& 0xff);
4102 off
+= 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
4105 * Now, have the $FABRIC_MOD fill in the protocol identifier
4107 desc_len
= se_tpg
->se_tpg_tfo
->tpg_get_pr_transport_id(se_tpg
,
4108 se_nacl
, pr_reg
, &format_code
, &buf
[off
+4]);
4110 spin_lock(&pr_tmpl
->registration_lock
);
4111 atomic_dec(&pr_reg
->pr_res_holders
);
4112 smp_mb__after_atomic_dec();
4114 * Set the ADDITIONAL DESCRIPTOR LENGTH
4116 buf
[off
++] = ((desc_len
>> 24) & 0xff);
4117 buf
[off
++] = ((desc_len
>> 16) & 0xff);
4118 buf
[off
++] = ((desc_len
>> 8) & 0xff);
4119 buf
[off
++] = (desc_len
& 0xff);
4121 * Size of full desctipor header minus TransportID
4122 * containing $FABRIC_MOD specific) initiator device/port
4125 * See spc4r17 Section 6.13.5 Table 169
4127 add_desc_len
= (24 + desc_len
);
4130 add_len
+= add_desc_len
;
4132 spin_unlock(&pr_tmpl
->registration_lock
);
4134 * Set ADDITIONAL_LENGTH
4136 buf
[4] = ((add_len
>> 24) & 0xff);
4137 buf
[5] = ((add_len
>> 16) & 0xff);
4138 buf
[6] = ((add_len
>> 8) & 0xff);
4139 buf
[7] = (add_len
& 0xff);
4141 transport_kunmap_data_sg(cmd
);
4147 target_scsi3_emulate_pr_in(struct se_cmd
*cmd
)
4152 * Following spc2r20 5.5.1 Reservations overview:
4154 * If a logical unit has been reserved by any RESERVE command and is
4155 * still reserved by any initiator, all PERSISTENT RESERVE IN and all
4156 * PERSISTENT RESERVE OUT commands shall conflict regardless of
4157 * initiator or service action and shall terminate with a RESERVATION
4160 if (cmd
->se_dev
->dev_reservation_flags
& DRF_SPC2_RESERVATIONS
) {
4161 pr_err("Received PERSISTENT_RESERVE CDB while legacy"
4162 " SPC-2 reservation is held, returning"
4163 " RESERVATION_CONFLICT\n");
4164 return TCM_RESERVATION_CONFLICT
;
4167 switch (cmd
->t_task_cdb
[1] & 0x1f) {
4169 ret
= core_scsi3_pri_read_keys(cmd
);
4171 case PRI_READ_RESERVATION
:
4172 ret
= core_scsi3_pri_read_reservation(cmd
);
4174 case PRI_REPORT_CAPABILITIES
:
4175 ret
= core_scsi3_pri_report_capabilities(cmd
);
4177 case PRI_READ_FULL_STATUS
:
4178 ret
= core_scsi3_pri_read_full_status(cmd
);
4181 pr_err("Unknown PERSISTENT_RESERVE_IN service"
4182 " action: 0x%02x\n", cmd
->t_task_cdb
[1] & 0x1f);
4183 return TCM_INVALID_CDB_FIELD
;
4187 target_complete_cmd(cmd
, GOOD
);
4192 target_check_reservation(struct se_cmd
*cmd
)
4194 struct se_device
*dev
= cmd
->se_dev
;
4199 if (dev
->se_hba
->hba_flags
& HBA_FLAGS_INTERNAL_USE
)
4201 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)
4204 spin_lock(&dev
->dev_reservation_lock
);
4205 if (dev
->dev_reservation_flags
& DRF_SPC2_RESERVATIONS
)
4206 ret
= target_scsi2_reservation_check(cmd
);
4208 ret
= target_scsi3_pr_reservation_check(cmd
);
4209 spin_unlock(&dev
->dev_reservation_lock
);