1 /*******************************************************************************
2 * Filename: target_core_alua.c
4 * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA)
6 * (c) Copyright 2009-2013 Datera, Inc.
8 * Nicholas A. Bellinger <nab@kernel.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 ******************************************************************************/
26 #include <linux/slab.h>
27 #include <linux/spinlock.h>
28 #include <linux/configfs.h>
29 #include <linux/export.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_alua.h"
42 #include "target_core_ua.h"
44 static sense_reason_t
core_alua_check_transition(int state
, int *primary
);
45 static int core_alua_set_tg_pt_secondary_state(
46 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
,
47 struct se_port
*port
, int explict
, int offline
);
49 static u16 alua_lu_gps_counter
;
50 static u32 alua_lu_gps_count
;
52 static DEFINE_SPINLOCK(lu_gps_lock
);
53 static LIST_HEAD(lu_gps_list
);
55 struct t10_alua_lu_gp
*default_lu_gp
;
58 * REPORT_TARGET_PORT_GROUPS
60 * See spc4r17 section 6.27
63 target_emulate_report_target_port_groups(struct se_cmd
*cmd
)
65 struct se_device
*dev
= cmd
->se_dev
;
67 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
68 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
71 int ext_hdr
= (cmd
->t_task_cdb
[1] & 0x20);
74 * Skip over RESERVED area to first Target port group descriptor
75 * depending on the PARAMETER DATA FORMAT type..
82 if (cmd
->data_length
< off
) {
83 pr_warn("REPORT TARGET PORT GROUPS allocation length %u too"
84 " small for %s header\n", cmd
->data_length
,
85 (ext_hdr
) ? "extended" : "normal");
86 return TCM_INVALID_CDB_FIELD
;
88 buf
= transport_kmap_data_sg(cmd
);
90 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
92 spin_lock(&dev
->t10_alua
.tg_pt_gps_lock
);
93 list_for_each_entry(tg_pt_gp
, &dev
->t10_alua
.tg_pt_gps_list
,
96 * Check if the Target port group and Target port descriptor list
97 * based on tg_pt_gp_members count will fit into the response payload.
98 * Otherwise, bump rd_len to let the initiator know we have exceeded
99 * the allocation length and the response is truncated.
101 if ((off
+ 8 + (tg_pt_gp
->tg_pt_gp_members
* 4)) >
103 rd_len
+= 8 + (tg_pt_gp
->tg_pt_gp_members
* 4);
107 * PREF: Preferred target port bit, determine if this
108 * bit should be set for port group.
110 if (tg_pt_gp
->tg_pt_gp_pref
)
113 * Set the ASYMMETRIC ACCESS State
115 buf
[off
++] |= (atomic_read(
116 &tg_pt_gp
->tg_pt_gp_alua_access_state
) & 0xff);
118 * Set supported ASYMMETRIC ACCESS State bits
120 buf
[off
] = 0x80; /* T_SUP */
121 buf
[off
] |= 0x40; /* O_SUP */
122 buf
[off
] |= 0x8; /* U_SUP */
123 buf
[off
] |= 0x4; /* S_SUP */
124 buf
[off
] |= 0x2; /* AN_SUP */
125 buf
[off
++] |= 0x1; /* AO_SUP */
129 buf
[off
++] = ((tg_pt_gp
->tg_pt_gp_id
>> 8) & 0xff);
130 buf
[off
++] = (tg_pt_gp
->tg_pt_gp_id
& 0xff);
132 off
++; /* Skip over Reserved */
136 buf
[off
++] = (tg_pt_gp
->tg_pt_gp_alua_access_status
& 0xff);
138 * Vendor Specific field
144 buf
[off
++] = (tg_pt_gp
->tg_pt_gp_members
& 0xff);
147 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
148 list_for_each_entry(tg_pt_gp_mem
, &tg_pt_gp
->tg_pt_gp_mem_list
,
150 port
= tg_pt_gp_mem
->tg_pt
;
152 * Start Target Port descriptor format
154 * See spc4r17 section 6.2.7 Table 247
156 off
+= 2; /* Skip over Obsolete */
158 * Set RELATIVE TARGET PORT IDENTIFIER
160 buf
[off
++] = ((port
->sep_rtpi
>> 8) & 0xff);
161 buf
[off
++] = (port
->sep_rtpi
& 0xff);
164 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
166 spin_unlock(&dev
->t10_alua
.tg_pt_gps_lock
);
168 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
170 put_unaligned_be32(rd_len
, &buf
[0]);
173 * Fill in the Extended header parameter data format if requested
178 * Set the implict transition time (in seconds) for the application
179 * client to use as a base for it's transition timeout value.
181 * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN
182 * this CDB was received upon to determine this value individually
183 * for ALUA target port group.
185 port
= cmd
->se_lun
->lun_sep
;
186 tg_pt_gp_mem
= port
->sep_alua_tg_pt_gp_mem
;
188 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
189 tg_pt_gp
= tg_pt_gp_mem
->tg_pt_gp
;
191 buf
[5] = tg_pt_gp
->tg_pt_gp_implict_trans_secs
;
192 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
195 transport_kunmap_data_sg(cmd
);
197 target_complete_cmd(cmd
, GOOD
);
202 * SET_TARGET_PORT_GROUPS for explict ALUA operation.
204 * See spc4r17 section 6.35
207 target_emulate_set_target_port_groups(struct se_cmd
*cmd
)
209 struct se_device
*dev
= cmd
->se_dev
;
210 struct se_port
*port
, *l_port
= cmd
->se_lun
->lun_sep
;
211 struct se_node_acl
*nacl
= cmd
->se_sess
->se_node_acl
;
212 struct t10_alua_tg_pt_gp
*tg_pt_gp
= NULL
, *l_tg_pt_gp
;
213 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
, *l_tg_pt_gp_mem
;
216 sense_reason_t rc
= TCM_NO_SENSE
;
217 u32 len
= 4; /* Skip over RESERVED area in header */
218 int alua_access_state
, primary
= 0;
222 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
224 if (cmd
->data_length
< 4) {
225 pr_warn("SET TARGET PORT GROUPS parameter list length %u too"
226 " small\n", cmd
->data_length
);
227 return TCM_INVALID_PARAMETER_LIST
;
230 buf
= transport_kmap_data_sg(cmd
);
232 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
235 * Determine if explict ALUA via SET_TARGET_PORT_GROUPS is allowed
236 * for the local tg_pt_gp.
238 l_tg_pt_gp_mem
= l_port
->sep_alua_tg_pt_gp_mem
;
239 if (!l_tg_pt_gp_mem
) {
240 pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n");
241 rc
= TCM_UNSUPPORTED_SCSI_OPCODE
;
244 spin_lock(&l_tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
245 l_tg_pt_gp
= l_tg_pt_gp_mem
->tg_pt_gp
;
247 spin_unlock(&l_tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
248 pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n");
249 rc
= TCM_UNSUPPORTED_SCSI_OPCODE
;
252 spin_unlock(&l_tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
254 if (!(l_tg_pt_gp
->tg_pt_gp_alua_access_type
& TPGS_EXPLICT_ALUA
)) {
255 pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
256 " while TPGS_EXPLICT_ALUA is disabled\n");
257 rc
= TCM_UNSUPPORTED_SCSI_OPCODE
;
261 ptr
= &buf
[4]; /* Skip over RESERVED area in header */
263 while (len
< cmd
->data_length
) {
265 alua_access_state
= (ptr
[0] & 0x0f);
267 * Check the received ALUA access state, and determine if
268 * the state is a primary or secondary target port asymmetric
271 rc
= core_alua_check_transition(alua_access_state
, &primary
);
274 * If the SET TARGET PORT GROUPS attempts to establish
275 * an invalid combination of target port asymmetric
276 * access states or attempts to establish an
277 * unsupported target port asymmetric access state,
278 * then the command shall be terminated with CHECK
279 * CONDITION status, with the sense key set to ILLEGAL
280 * REQUEST, and the additional sense code set to INVALID
281 * FIELD IN PARAMETER LIST.
287 * If the ASYMMETRIC ACCESS STATE field (see table 267)
288 * specifies a primary target port asymmetric access state,
289 * then the TARGET PORT GROUP OR TARGET PORT field specifies
290 * a primary target port group for which the primary target
291 * port asymmetric access state shall be changed. If the
292 * ASYMMETRIC ACCESS STATE field specifies a secondary target
293 * port asymmetric access state, then the TARGET PORT GROUP OR
294 * TARGET PORT field specifies the relative target port
295 * identifier (see 3.1.120) of the target port for which the
296 * secondary target port asymmetric access state shall be
300 tg_pt_id
= get_unaligned_be16(ptr
+ 2);
302 * Locate the matching target port group ID from
303 * the global tg_pt_gp list
305 spin_lock(&dev
->t10_alua
.tg_pt_gps_lock
);
306 list_for_each_entry(tg_pt_gp
,
307 &dev
->t10_alua
.tg_pt_gps_list
,
309 if (!tg_pt_gp
->tg_pt_gp_valid_id
)
312 if (tg_pt_id
!= tg_pt_gp
->tg_pt_gp_id
)
315 atomic_inc(&tg_pt_gp
->tg_pt_gp_ref_cnt
);
316 smp_mb__after_atomic_inc();
318 spin_unlock(&dev
->t10_alua
.tg_pt_gps_lock
);
320 if (!core_alua_do_port_transition(tg_pt_gp
,
322 alua_access_state
, 1))
325 spin_lock(&dev
->t10_alua
.tg_pt_gps_lock
);
326 atomic_dec(&tg_pt_gp
->tg_pt_gp_ref_cnt
);
327 smp_mb__after_atomic_dec();
330 spin_unlock(&dev
->t10_alua
.tg_pt_gps_lock
);
333 * Extact the RELATIVE TARGET PORT IDENTIFIER to identify
334 * the Target Port in question for the the incoming
335 * SET_TARGET_PORT_GROUPS op.
337 rtpi
= get_unaligned_be16(ptr
+ 2);
339 * Locate the matching relative target port identifier
340 * for the struct se_device storage object.
342 spin_lock(&dev
->se_port_lock
);
343 list_for_each_entry(port
, &dev
->dev_sep_list
,
345 if (port
->sep_rtpi
!= rtpi
)
348 tg_pt_gp_mem
= port
->sep_alua_tg_pt_gp_mem
;
350 spin_unlock(&dev
->se_port_lock
);
352 if (!core_alua_set_tg_pt_secondary_state(
353 tg_pt_gp_mem
, port
, 1, 1))
356 spin_lock(&dev
->se_port_lock
);
359 spin_unlock(&dev
->se_port_lock
);
363 rc
= TCM_INVALID_PARAMETER_LIST
;
372 transport_kunmap_data_sg(cmd
);
374 target_complete_cmd(cmd
, GOOD
);
378 static inline int core_alua_state_nonoptimized(
381 int nonop_delay_msecs
,
385 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
386 * later to determine if processing of this cmd needs to be
387 * temporarily delayed for the Active/NonOptimized primary access state.
389 cmd
->se_cmd_flags
|= SCF_ALUA_NON_OPTIMIZED
;
390 cmd
->alua_nonop_delay
= nonop_delay_msecs
;
394 static inline int core_alua_state_standby(
400 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
401 * spc4r17 section 5.9.2.4.4
410 case RECEIVE_DIAGNOSTIC
:
411 case SEND_DIAGNOSTIC
:
414 switch (cdb
[1] & 0x1f) {
415 case MI_REPORT_TARGET_PGS
:
418 *alua_ascq
= ASCQ_04H_ALUA_TG_PT_STANDBY
;
421 case MAINTENANCE_OUT
:
423 case MO_SET_TARGET_PGS
:
426 *alua_ascq
= ASCQ_04H_ALUA_TG_PT_STANDBY
;
430 case PERSISTENT_RESERVE_IN
:
431 case PERSISTENT_RESERVE_OUT
:
436 *alua_ascq
= ASCQ_04H_ALUA_TG_PT_STANDBY
;
443 static inline int core_alua_state_unavailable(
449 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
450 * spc4r17 section 5.9.2.4.5
457 switch (cdb
[1] & 0x1f) {
458 case MI_REPORT_TARGET_PGS
:
461 *alua_ascq
= ASCQ_04H_ALUA_TG_PT_UNAVAILABLE
;
464 case MAINTENANCE_OUT
:
466 case MO_SET_TARGET_PGS
:
469 *alua_ascq
= ASCQ_04H_ALUA_TG_PT_UNAVAILABLE
;
477 *alua_ascq
= ASCQ_04H_ALUA_TG_PT_UNAVAILABLE
;
484 static inline int core_alua_state_transition(
490 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITIO as defined by
491 * spc4r17 section 5.9.2.5
498 switch (cdb
[1] & 0x1f) {
499 case MI_REPORT_TARGET_PGS
:
502 *alua_ascq
= ASCQ_04H_ALUA_STATE_TRANSITION
;
510 *alua_ascq
= ASCQ_04H_ALUA_STATE_TRANSITION
;
518 * return 1: Is used to signal LUN not accecsable, and check condition/not ready
519 * return 0: Used to signal success
520 * reutrn -1: Used to signal failure, and invalid cdb field
523 target_alua_state_check(struct se_cmd
*cmd
)
525 struct se_device
*dev
= cmd
->se_dev
;
526 unsigned char *cdb
= cmd
->t_task_cdb
;
527 struct se_lun
*lun
= cmd
->se_lun
;
528 struct se_port
*port
= lun
->lun_sep
;
529 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
530 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
531 int out_alua_state
, nonop_delay_msecs
;
535 if (dev
->se_hba
->hba_flags
& HBA_FLAGS_INTERNAL_USE
)
537 if (dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
)
543 * First, check for a struct se_port specific secondary ALUA target port
544 * access state: OFFLINE
546 if (atomic_read(&port
->sep_tg_pt_secondary_offline
)) {
547 pr_debug("ALUA: Got secondary offline status for local"
549 alua_ascq
= ASCQ_04H_ALUA_OFFLINE
;
554 * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the
555 * ALUA target port group, to obtain current ALUA access state.
556 * Otherwise look for the underlying struct se_device association with
557 * a ALUA logical unit group.
559 tg_pt_gp_mem
= port
->sep_alua_tg_pt_gp_mem
;
563 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
564 tg_pt_gp
= tg_pt_gp_mem
->tg_pt_gp
;
565 out_alua_state
= atomic_read(&tg_pt_gp
->tg_pt_gp_alua_access_state
);
566 nonop_delay_msecs
= tg_pt_gp
->tg_pt_gp_nonop_delay_msecs
;
567 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
569 * Process ALUA_ACCESS_STATE_ACTIVE_OPTMIZED in a separate conditional
570 * statement so the compiler knows explicitly to check this case first.
571 * For the Optimized ALUA access state case, we want to process the
572 * incoming fabric cmd ASAP..
574 if (out_alua_state
== ALUA_ACCESS_STATE_ACTIVE_OPTMIZED
)
577 switch (out_alua_state
) {
578 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED
:
579 ret
= core_alua_state_nonoptimized(cmd
, cdb
,
580 nonop_delay_msecs
, &alua_ascq
);
582 case ALUA_ACCESS_STATE_STANDBY
:
583 ret
= core_alua_state_standby(cmd
, cdb
, &alua_ascq
);
585 case ALUA_ACCESS_STATE_UNAVAILABLE
:
586 ret
= core_alua_state_unavailable(cmd
, cdb
, &alua_ascq
);
588 case ALUA_ACCESS_STATE_TRANSITION
:
589 ret
= core_alua_state_transition(cmd
, cdb
, &alua_ascq
);
592 * OFFLINE is a secondary ALUA target port group access state, that is
593 * handled above with struct se_port->sep_tg_pt_secondary_offline=1
595 case ALUA_ACCESS_STATE_OFFLINE
:
597 pr_err("Unknown ALUA access state: 0x%02x\n",
599 return TCM_INVALID_CDB_FIELD
;
605 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
606 * The ALUA additional sense code qualifier (ASCQ) is determined
607 * by the ALUA primary or secondary access state..
609 pr_debug("[%s]: ALUA TG Port not available, "
610 "SenseKey: NOT_READY, ASC/ASCQ: "
612 cmd
->se_tfo
->get_fabric_name(), alua_ascq
);
614 cmd
->scsi_asc
= 0x04;
615 cmd
->scsi_ascq
= alua_ascq
;
616 return TCM_CHECK_CONDITION_NOT_READY
;
623 * Check implict and explict ALUA state change request.
625 static sense_reason_t
626 core_alua_check_transition(int state
, int *primary
)
629 case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED
:
630 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED
:
631 case ALUA_ACCESS_STATE_STANDBY
:
632 case ALUA_ACCESS_STATE_UNAVAILABLE
:
634 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
635 * defined as primary target port asymmetric access states.
639 case ALUA_ACCESS_STATE_OFFLINE
:
641 * OFFLINE state is defined as a secondary target port
642 * asymmetric access state.
647 pr_err("Unknown ALUA access state: 0x%02x\n", state
);
648 return TCM_INVALID_PARAMETER_LIST
;
654 static char *core_alua_dump_state(int state
)
657 case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED
:
658 return "Active/Optimized";
659 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED
:
660 return "Active/NonOptimized";
661 case ALUA_ACCESS_STATE_STANDBY
:
663 case ALUA_ACCESS_STATE_UNAVAILABLE
:
664 return "Unavailable";
665 case ALUA_ACCESS_STATE_OFFLINE
:
674 char *core_alua_dump_status(int status
)
677 case ALUA_STATUS_NONE
:
679 case ALUA_STATUS_ALTERED_BY_EXPLICT_STPG
:
680 return "Altered by Explict STPG";
681 case ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA
:
682 return "Altered by Implict ALUA";
691 * Used by fabric modules to determine when we need to delay processing
692 * for the Active/NonOptimized paths..
694 int core_alua_check_nonop_delay(
697 if (!(cmd
->se_cmd_flags
& SCF_ALUA_NON_OPTIMIZED
))
702 * The ALUA Active/NonOptimized access state delay can be disabled
703 * in via configfs with a value of zero
705 if (!cmd
->alua_nonop_delay
)
708 * struct se_cmd->alua_nonop_delay gets set by a target port group
709 * defined interval in core_alua_state_nonoptimized()
711 msleep_interruptible(cmd
->alua_nonop_delay
);
714 EXPORT_SYMBOL(core_alua_check_nonop_delay
);
717 * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex
720 static int core_alua_write_tpg_metadata(
722 unsigned char *md_buf
,
725 struct file
*file
= filp_open(path
, O_RDWR
| O_CREAT
| O_TRUNC
, 0600);
729 pr_err("filp_open(%s) for ALUA metadata failed\n", path
);
732 ret
= kernel_write(file
, md_buf
, md_buf_len
, 0);
734 pr_err("Error writing ALUA metadata file: %s\n", path
);
736 return (ret
< 0) ? -EIO
: 0;
740 * Called with tg_pt_gp->tg_pt_gp_md_mutex held
742 static int core_alua_update_tpg_primary_metadata(
743 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
745 unsigned char *md_buf
)
747 struct t10_wwn
*wwn
= &tg_pt_gp
->tg_pt_gp_dev
->t10_wwn
;
748 char path
[ALUA_METADATA_PATH_LEN
];
751 memset(path
, 0, ALUA_METADATA_PATH_LEN
);
753 len
= snprintf(md_buf
, tg_pt_gp
->tg_pt_gp_md_buf_len
,
755 "alua_access_state=0x%02x\n"
756 "alua_access_status=0x%02x\n",
757 tg_pt_gp
->tg_pt_gp_id
, primary_state
,
758 tg_pt_gp
->tg_pt_gp_alua_access_status
);
760 snprintf(path
, ALUA_METADATA_PATH_LEN
,
761 "/var/target/alua/tpgs_%s/%s", &wwn
->unit_serial
[0],
762 config_item_name(&tg_pt_gp
->tg_pt_gp_group
.cg_item
));
764 return core_alua_write_tpg_metadata(path
, md_buf
, len
);
767 static int core_alua_do_transition_tg_pt(
768 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
769 struct se_port
*l_port
,
770 struct se_node_acl
*nacl
,
771 unsigned char *md_buf
,
775 struct se_dev_entry
*se_deve
;
776 struct se_lun_acl
*lacl
;
777 struct se_port
*port
;
778 struct t10_alua_tg_pt_gp_member
*mem
;
781 * Save the old primary ALUA access state, and set the current state
782 * to ALUA_ACCESS_STATE_TRANSITION.
784 old_state
= atomic_read(&tg_pt_gp
->tg_pt_gp_alua_access_state
);
785 atomic_set(&tg_pt_gp
->tg_pt_gp_alua_access_state
,
786 ALUA_ACCESS_STATE_TRANSITION
);
787 tg_pt_gp
->tg_pt_gp_alua_access_status
= (explict
) ?
788 ALUA_STATUS_ALTERED_BY_EXPLICT_STPG
:
789 ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA
;
791 * Check for the optional ALUA primary state transition delay
793 if (tg_pt_gp
->tg_pt_gp_trans_delay_msecs
!= 0)
794 msleep_interruptible(tg_pt_gp
->tg_pt_gp_trans_delay_msecs
);
796 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
797 list_for_each_entry(mem
, &tg_pt_gp
->tg_pt_gp_mem_list
,
801 * After an implicit target port asymmetric access state
802 * change, a device server shall establish a unit attention
803 * condition for the initiator port associated with every I_T
804 * nexus with the additional sense code set to ASYMMETRIC
805 * ACCESS STATE CHAGED.
807 * After an explicit target port asymmetric access state
808 * change, a device server shall establish a unit attention
809 * condition with the additional sense code set to ASYMMETRIC
810 * ACCESS STATE CHANGED for the initiator port associated with
811 * every I_T nexus other than the I_T nexus on which the SET
812 * TARGET PORT GROUPS command
814 atomic_inc(&mem
->tg_pt_gp_mem_ref_cnt
);
815 smp_mb__after_atomic_inc();
816 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
818 spin_lock_bh(&port
->sep_alua_lock
);
819 list_for_each_entry(se_deve
, &port
->sep_alua_list
,
821 lacl
= se_deve
->se_lun_acl
;
823 * se_deve->se_lun_acl pointer may be NULL for a
824 * entry created without explict Node+MappedLUN ACLs
830 (nacl
!= NULL
) && (nacl
== lacl
->se_lun_nacl
) &&
831 (l_port
!= NULL
) && (l_port
== port
))
834 core_scsi3_ua_allocate(lacl
->se_lun_nacl
,
835 se_deve
->mapped_lun
, 0x2A,
836 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED
);
838 spin_unlock_bh(&port
->sep_alua_lock
);
840 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
841 atomic_dec(&mem
->tg_pt_gp_mem_ref_cnt
);
842 smp_mb__after_atomic_dec();
844 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
846 * Update the ALUA metadata buf that has been allocated in
847 * core_alua_do_port_transition(), this metadata will be written
850 * Note that there is the case where we do not want to update the
851 * metadata when the saved metadata is being parsed in userspace
852 * when setting the existing port access state and access status.
854 * Also note that the failure to write out the ALUA metadata to
855 * struct file does NOT affect the actual ALUA transition.
857 if (tg_pt_gp
->tg_pt_gp_write_metadata
) {
858 mutex_lock(&tg_pt_gp
->tg_pt_gp_md_mutex
);
859 core_alua_update_tpg_primary_metadata(tg_pt_gp
,
861 mutex_unlock(&tg_pt_gp
->tg_pt_gp_md_mutex
);
864 * Set the current primary ALUA access state to the requested new state
866 atomic_set(&tg_pt_gp
->tg_pt_gp_alua_access_state
, new_state
);
868 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
869 " from primary access state %s to %s\n", (explict
) ? "explict" :
870 "implict", config_item_name(&tg_pt_gp
->tg_pt_gp_group
.cg_item
),
871 tg_pt_gp
->tg_pt_gp_id
, core_alua_dump_state(old_state
),
872 core_alua_dump_state(new_state
));
877 int core_alua_do_port_transition(
878 struct t10_alua_tg_pt_gp
*l_tg_pt_gp
,
879 struct se_device
*l_dev
,
880 struct se_port
*l_port
,
881 struct se_node_acl
*l_nacl
,
885 struct se_device
*dev
;
886 struct se_port
*port
;
887 struct se_node_acl
*nacl
;
888 struct t10_alua_lu_gp
*lu_gp
;
889 struct t10_alua_lu_gp_member
*lu_gp_mem
, *local_lu_gp_mem
;
890 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
891 unsigned char *md_buf
;
894 if (core_alua_check_transition(new_state
, &primary
) != 0)
897 md_buf
= kzalloc(l_tg_pt_gp
->tg_pt_gp_md_buf_len
, GFP_KERNEL
);
899 pr_err("Unable to allocate buf for ALUA metadata\n");
903 local_lu_gp_mem
= l_dev
->dev_alua_lu_gp_mem
;
904 spin_lock(&local_lu_gp_mem
->lu_gp_mem_lock
);
905 lu_gp
= local_lu_gp_mem
->lu_gp
;
906 atomic_inc(&lu_gp
->lu_gp_ref_cnt
);
907 smp_mb__after_atomic_inc();
908 spin_unlock(&local_lu_gp_mem
->lu_gp_mem_lock
);
910 * For storage objects that are members of the 'default_lu_gp',
911 * we only do transition on the passed *l_tp_pt_gp, and not
912 * on all of the matching target port groups IDs in default_lu_gp.
914 if (!lu_gp
->lu_gp_id
) {
916 * core_alua_do_transition_tg_pt() will always return
919 core_alua_do_transition_tg_pt(l_tg_pt_gp
, l_port
, l_nacl
,
920 md_buf
, new_state
, explict
);
921 atomic_dec(&lu_gp
->lu_gp_ref_cnt
);
922 smp_mb__after_atomic_dec();
927 * For all other LU groups aside from 'default_lu_gp', walk all of
928 * the associated storage objects looking for a matching target port
929 * group ID from the local target port group.
931 spin_lock(&lu_gp
->lu_gp_lock
);
932 list_for_each_entry(lu_gp_mem
, &lu_gp
->lu_gp_mem_list
,
935 dev
= lu_gp_mem
->lu_gp_mem_dev
;
936 atomic_inc(&lu_gp_mem
->lu_gp_mem_ref_cnt
);
937 smp_mb__after_atomic_inc();
938 spin_unlock(&lu_gp
->lu_gp_lock
);
940 spin_lock(&dev
->t10_alua
.tg_pt_gps_lock
);
941 list_for_each_entry(tg_pt_gp
,
942 &dev
->t10_alua
.tg_pt_gps_list
,
945 if (!tg_pt_gp
->tg_pt_gp_valid_id
)
948 * If the target behavior port asymmetric access state
949 * is changed for any target port group accessiable via
950 * a logical unit within a LU group, the target port
951 * behavior group asymmetric access states for the same
952 * target port group accessible via other logical units
953 * in that LU group will also change.
955 if (l_tg_pt_gp
->tg_pt_gp_id
!= tg_pt_gp
->tg_pt_gp_id
)
958 if (l_tg_pt_gp
== tg_pt_gp
) {
965 atomic_inc(&tg_pt_gp
->tg_pt_gp_ref_cnt
);
966 smp_mb__after_atomic_inc();
967 spin_unlock(&dev
->t10_alua
.tg_pt_gps_lock
);
969 * core_alua_do_transition_tg_pt() will always return
972 core_alua_do_transition_tg_pt(tg_pt_gp
, port
,
973 nacl
, md_buf
, new_state
, explict
);
975 spin_lock(&dev
->t10_alua
.tg_pt_gps_lock
);
976 atomic_dec(&tg_pt_gp
->tg_pt_gp_ref_cnt
);
977 smp_mb__after_atomic_dec();
979 spin_unlock(&dev
->t10_alua
.tg_pt_gps_lock
);
981 spin_lock(&lu_gp
->lu_gp_lock
);
982 atomic_dec(&lu_gp_mem
->lu_gp_mem_ref_cnt
);
983 smp_mb__after_atomic_dec();
985 spin_unlock(&lu_gp
->lu_gp_lock
);
987 pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
988 " Group IDs: %hu %s transition to primary state: %s\n",
989 config_item_name(&lu_gp
->lu_gp_group
.cg_item
),
990 l_tg_pt_gp
->tg_pt_gp_id
, (explict
) ? "explict" : "implict",
991 core_alua_dump_state(new_state
));
993 atomic_dec(&lu_gp
->lu_gp_ref_cnt
);
994 smp_mb__after_atomic_dec();
1000 * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held
1002 static int core_alua_update_tpg_secondary_metadata(
1003 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
,
1004 struct se_port
*port
,
1005 unsigned char *md_buf
,
1008 struct se_portal_group
*se_tpg
= port
->sep_tpg
;
1009 char path
[ALUA_METADATA_PATH_LEN
], wwn
[ALUA_SECONDARY_METADATA_WWN_LEN
];
1012 memset(path
, 0, ALUA_METADATA_PATH_LEN
);
1013 memset(wwn
, 0, ALUA_SECONDARY_METADATA_WWN_LEN
);
1015 len
= snprintf(wwn
, ALUA_SECONDARY_METADATA_WWN_LEN
, "%s",
1016 se_tpg
->se_tpg_tfo
->tpg_get_wwn(se_tpg
));
1018 if (se_tpg
->se_tpg_tfo
->tpg_get_tag
!= NULL
)
1019 snprintf(wwn
+len
, ALUA_SECONDARY_METADATA_WWN_LEN
-len
, "+%hu",
1020 se_tpg
->se_tpg_tfo
->tpg_get_tag(se_tpg
));
1022 len
= snprintf(md_buf
, md_buf_len
, "alua_tg_pt_offline=%d\n"
1023 "alua_tg_pt_status=0x%02x\n",
1024 atomic_read(&port
->sep_tg_pt_secondary_offline
),
1025 port
->sep_tg_pt_secondary_stat
);
1027 snprintf(path
, ALUA_METADATA_PATH_LEN
, "/var/target/alua/%s/%s/lun_%u",
1028 se_tpg
->se_tpg_tfo
->get_fabric_name(), wwn
,
1029 port
->sep_lun
->unpacked_lun
);
1031 return core_alua_write_tpg_metadata(path
, md_buf
, len
);
1034 static int core_alua_set_tg_pt_secondary_state(
1035 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
,
1036 struct se_port
*port
,
1040 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
1041 unsigned char *md_buf
;
1043 int trans_delay_msecs
;
1045 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1046 tg_pt_gp
= tg_pt_gp_mem
->tg_pt_gp
;
1048 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1049 pr_err("Unable to complete secondary state"
1053 trans_delay_msecs
= tg_pt_gp
->tg_pt_gp_trans_delay_msecs
;
1055 * Set the secondary ALUA target port access state to OFFLINE
1056 * or release the previously secondary state for struct se_port
1059 atomic_set(&port
->sep_tg_pt_secondary_offline
, 1);
1061 atomic_set(&port
->sep_tg_pt_secondary_offline
, 0);
1063 md_buf_len
= tg_pt_gp
->tg_pt_gp_md_buf_len
;
1064 port
->sep_tg_pt_secondary_stat
= (explict
) ?
1065 ALUA_STATUS_ALTERED_BY_EXPLICT_STPG
:
1066 ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA
;
1068 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1069 " to secondary access state: %s\n", (explict
) ? "explict" :
1070 "implict", config_item_name(&tg_pt_gp
->tg_pt_gp_group
.cg_item
),
1071 tg_pt_gp
->tg_pt_gp_id
, (offline
) ? "OFFLINE" : "ONLINE");
1073 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1075 * Do the optional transition delay after we set the secondary
1076 * ALUA access state.
1078 if (trans_delay_msecs
!= 0)
1079 msleep_interruptible(trans_delay_msecs
);
1081 * See if we need to update the ALUA fabric port metadata for
1082 * secondary state and status
1084 if (port
->sep_tg_pt_secondary_write_md
) {
1085 md_buf
= kzalloc(md_buf_len
, GFP_KERNEL
);
1087 pr_err("Unable to allocate md_buf for"
1088 " secondary ALUA access metadata\n");
1091 mutex_lock(&port
->sep_tg_pt_md_mutex
);
1092 core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem
, port
,
1093 md_buf
, md_buf_len
);
1094 mutex_unlock(&port
->sep_tg_pt_md_mutex
);
1102 struct t10_alua_lu_gp
*
1103 core_alua_allocate_lu_gp(const char *name
, int def_group
)
1105 struct t10_alua_lu_gp
*lu_gp
;
1107 lu_gp
= kmem_cache_zalloc(t10_alua_lu_gp_cache
, GFP_KERNEL
);
1109 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1110 return ERR_PTR(-ENOMEM
);
1112 INIT_LIST_HEAD(&lu_gp
->lu_gp_node
);
1113 INIT_LIST_HEAD(&lu_gp
->lu_gp_mem_list
);
1114 spin_lock_init(&lu_gp
->lu_gp_lock
);
1115 atomic_set(&lu_gp
->lu_gp_ref_cnt
, 0);
1118 lu_gp
->lu_gp_id
= alua_lu_gps_counter
++;
1119 lu_gp
->lu_gp_valid_id
= 1;
1120 alua_lu_gps_count
++;
1126 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp
*lu_gp
, u16 lu_gp_id
)
1128 struct t10_alua_lu_gp
*lu_gp_tmp
;
1131 * The lu_gp->lu_gp_id may only be set once..
1133 if (lu_gp
->lu_gp_valid_id
) {
1134 pr_warn("ALUA LU Group already has a valid ID,"
1135 " ignoring request\n");
1139 spin_lock(&lu_gps_lock
);
1140 if (alua_lu_gps_count
== 0x0000ffff) {
1141 pr_err("Maximum ALUA alua_lu_gps_count:"
1142 " 0x0000ffff reached\n");
1143 spin_unlock(&lu_gps_lock
);
1144 kmem_cache_free(t10_alua_lu_gp_cache
, lu_gp
);
1148 lu_gp_id_tmp
= (lu_gp_id
!= 0) ? lu_gp_id
:
1149 alua_lu_gps_counter
++;
1151 list_for_each_entry(lu_gp_tmp
, &lu_gps_list
, lu_gp_node
) {
1152 if (lu_gp_tmp
->lu_gp_id
== lu_gp_id_tmp
) {
1156 pr_warn("ALUA Logical Unit Group ID: %hu"
1157 " already exists, ignoring request\n",
1159 spin_unlock(&lu_gps_lock
);
1164 lu_gp
->lu_gp_id
= lu_gp_id_tmp
;
1165 lu_gp
->lu_gp_valid_id
= 1;
1166 list_add_tail(&lu_gp
->lu_gp_node
, &lu_gps_list
);
1167 alua_lu_gps_count
++;
1168 spin_unlock(&lu_gps_lock
);
1173 static struct t10_alua_lu_gp_member
*
1174 core_alua_allocate_lu_gp_mem(struct se_device
*dev
)
1176 struct t10_alua_lu_gp_member
*lu_gp_mem
;
1178 lu_gp_mem
= kmem_cache_zalloc(t10_alua_lu_gp_mem_cache
, GFP_KERNEL
);
1180 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1181 return ERR_PTR(-ENOMEM
);
1183 INIT_LIST_HEAD(&lu_gp_mem
->lu_gp_mem_list
);
1184 spin_lock_init(&lu_gp_mem
->lu_gp_mem_lock
);
1185 atomic_set(&lu_gp_mem
->lu_gp_mem_ref_cnt
, 0);
1187 lu_gp_mem
->lu_gp_mem_dev
= dev
;
1188 dev
->dev_alua_lu_gp_mem
= lu_gp_mem
;
1193 void core_alua_free_lu_gp(struct t10_alua_lu_gp
*lu_gp
)
1195 struct t10_alua_lu_gp_member
*lu_gp_mem
, *lu_gp_mem_tmp
;
1197 * Once we have reached this point, config_item_put() has
1198 * already been called from target_core_alua_drop_lu_gp().
1200 * Here, we remove the *lu_gp from the global list so that
1201 * no associations can be made while we are releasing
1202 * struct t10_alua_lu_gp.
1204 spin_lock(&lu_gps_lock
);
1205 list_del(&lu_gp
->lu_gp_node
);
1206 alua_lu_gps_count
--;
1207 spin_unlock(&lu_gps_lock
);
1209 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1210 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1211 * released with core_alua_put_lu_gp_from_name()
1213 while (atomic_read(&lu_gp
->lu_gp_ref_cnt
))
1216 * Release reference to struct t10_alua_lu_gp * from all associated
1219 spin_lock(&lu_gp
->lu_gp_lock
);
1220 list_for_each_entry_safe(lu_gp_mem
, lu_gp_mem_tmp
,
1221 &lu_gp
->lu_gp_mem_list
, lu_gp_mem_list
) {
1222 if (lu_gp_mem
->lu_gp_assoc
) {
1223 list_del(&lu_gp_mem
->lu_gp_mem_list
);
1224 lu_gp
->lu_gp_members
--;
1225 lu_gp_mem
->lu_gp_assoc
= 0;
1227 spin_unlock(&lu_gp
->lu_gp_lock
);
1230 * lu_gp_mem is associated with a single
1231 * struct se_device->dev_alua_lu_gp_mem, and is released when
1232 * struct se_device is released via core_alua_free_lu_gp_mem().
1234 * If the passed lu_gp does NOT match the default_lu_gp, assume
1235 * we want to re-assocate a given lu_gp_mem with default_lu_gp.
1237 spin_lock(&lu_gp_mem
->lu_gp_mem_lock
);
1238 if (lu_gp
!= default_lu_gp
)
1239 __core_alua_attach_lu_gp_mem(lu_gp_mem
,
1242 lu_gp_mem
->lu_gp
= NULL
;
1243 spin_unlock(&lu_gp_mem
->lu_gp_mem_lock
);
1245 spin_lock(&lu_gp
->lu_gp_lock
);
1247 spin_unlock(&lu_gp
->lu_gp_lock
);
1249 kmem_cache_free(t10_alua_lu_gp_cache
, lu_gp
);
1252 void core_alua_free_lu_gp_mem(struct se_device
*dev
)
1254 struct t10_alua_lu_gp
*lu_gp
;
1255 struct t10_alua_lu_gp_member
*lu_gp_mem
;
1257 lu_gp_mem
= dev
->dev_alua_lu_gp_mem
;
1261 while (atomic_read(&lu_gp_mem
->lu_gp_mem_ref_cnt
))
1264 spin_lock(&lu_gp_mem
->lu_gp_mem_lock
);
1265 lu_gp
= lu_gp_mem
->lu_gp
;
1267 spin_lock(&lu_gp
->lu_gp_lock
);
1268 if (lu_gp_mem
->lu_gp_assoc
) {
1269 list_del(&lu_gp_mem
->lu_gp_mem_list
);
1270 lu_gp
->lu_gp_members
--;
1271 lu_gp_mem
->lu_gp_assoc
= 0;
1273 spin_unlock(&lu_gp
->lu_gp_lock
);
1274 lu_gp_mem
->lu_gp
= NULL
;
1276 spin_unlock(&lu_gp_mem
->lu_gp_mem_lock
);
1278 kmem_cache_free(t10_alua_lu_gp_mem_cache
, lu_gp_mem
);
1281 struct t10_alua_lu_gp
*core_alua_get_lu_gp_by_name(const char *name
)
1283 struct t10_alua_lu_gp
*lu_gp
;
1284 struct config_item
*ci
;
1286 spin_lock(&lu_gps_lock
);
1287 list_for_each_entry(lu_gp
, &lu_gps_list
, lu_gp_node
) {
1288 if (!lu_gp
->lu_gp_valid_id
)
1290 ci
= &lu_gp
->lu_gp_group
.cg_item
;
1291 if (!strcmp(config_item_name(ci
), name
)) {
1292 atomic_inc(&lu_gp
->lu_gp_ref_cnt
);
1293 spin_unlock(&lu_gps_lock
);
1297 spin_unlock(&lu_gps_lock
);
1302 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp
*lu_gp
)
1304 spin_lock(&lu_gps_lock
);
1305 atomic_dec(&lu_gp
->lu_gp_ref_cnt
);
1306 spin_unlock(&lu_gps_lock
);
1310 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1312 void __core_alua_attach_lu_gp_mem(
1313 struct t10_alua_lu_gp_member
*lu_gp_mem
,
1314 struct t10_alua_lu_gp
*lu_gp
)
1316 spin_lock(&lu_gp
->lu_gp_lock
);
1317 lu_gp_mem
->lu_gp
= lu_gp
;
1318 lu_gp_mem
->lu_gp_assoc
= 1;
1319 list_add_tail(&lu_gp_mem
->lu_gp_mem_list
, &lu_gp
->lu_gp_mem_list
);
1320 lu_gp
->lu_gp_members
++;
1321 spin_unlock(&lu_gp
->lu_gp_lock
);
1325 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1327 void __core_alua_drop_lu_gp_mem(
1328 struct t10_alua_lu_gp_member
*lu_gp_mem
,
1329 struct t10_alua_lu_gp
*lu_gp
)
1331 spin_lock(&lu_gp
->lu_gp_lock
);
1332 list_del(&lu_gp_mem
->lu_gp_mem_list
);
1333 lu_gp_mem
->lu_gp
= NULL
;
1334 lu_gp_mem
->lu_gp_assoc
= 0;
1335 lu_gp
->lu_gp_members
--;
1336 spin_unlock(&lu_gp
->lu_gp_lock
);
1339 struct t10_alua_tg_pt_gp
*core_alua_allocate_tg_pt_gp(struct se_device
*dev
,
1340 const char *name
, int def_group
)
1342 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
1344 tg_pt_gp
= kmem_cache_zalloc(t10_alua_tg_pt_gp_cache
, GFP_KERNEL
);
1346 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1349 INIT_LIST_HEAD(&tg_pt_gp
->tg_pt_gp_list
);
1350 INIT_LIST_HEAD(&tg_pt_gp
->tg_pt_gp_mem_list
);
1351 mutex_init(&tg_pt_gp
->tg_pt_gp_md_mutex
);
1352 spin_lock_init(&tg_pt_gp
->tg_pt_gp_lock
);
1353 atomic_set(&tg_pt_gp
->tg_pt_gp_ref_cnt
, 0);
1354 tg_pt_gp
->tg_pt_gp_dev
= dev
;
1355 tg_pt_gp
->tg_pt_gp_md_buf_len
= ALUA_MD_BUF_LEN
;
1356 atomic_set(&tg_pt_gp
->tg_pt_gp_alua_access_state
,
1357 ALUA_ACCESS_STATE_ACTIVE_OPTMIZED
);
1359 * Enable both explict and implict ALUA support by default
1361 tg_pt_gp
->tg_pt_gp_alua_access_type
=
1362 TPGS_EXPLICT_ALUA
| TPGS_IMPLICT_ALUA
;
1364 * Set the default Active/NonOptimized Delay in milliseconds
1366 tg_pt_gp
->tg_pt_gp_nonop_delay_msecs
= ALUA_DEFAULT_NONOP_DELAY_MSECS
;
1367 tg_pt_gp
->tg_pt_gp_trans_delay_msecs
= ALUA_DEFAULT_TRANS_DELAY_MSECS
;
1368 tg_pt_gp
->tg_pt_gp_implict_trans_secs
= ALUA_DEFAULT_IMPLICT_TRANS_SECS
;
1371 spin_lock(&dev
->t10_alua
.tg_pt_gps_lock
);
1372 tg_pt_gp
->tg_pt_gp_id
=
1373 dev
->t10_alua
.alua_tg_pt_gps_counter
++;
1374 tg_pt_gp
->tg_pt_gp_valid_id
= 1;
1375 dev
->t10_alua
.alua_tg_pt_gps_count
++;
1376 list_add_tail(&tg_pt_gp
->tg_pt_gp_list
,
1377 &dev
->t10_alua
.tg_pt_gps_list
);
1378 spin_unlock(&dev
->t10_alua
.tg_pt_gps_lock
);
1384 int core_alua_set_tg_pt_gp_id(
1385 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1388 struct se_device
*dev
= tg_pt_gp
->tg_pt_gp_dev
;
1389 struct t10_alua_tg_pt_gp
*tg_pt_gp_tmp
;
1390 u16 tg_pt_gp_id_tmp
;
1393 * The tg_pt_gp->tg_pt_gp_id may only be set once..
1395 if (tg_pt_gp
->tg_pt_gp_valid_id
) {
1396 pr_warn("ALUA TG PT Group already has a valid ID,"
1397 " ignoring request\n");
1401 spin_lock(&dev
->t10_alua
.tg_pt_gps_lock
);
1402 if (dev
->t10_alua
.alua_tg_pt_gps_count
== 0x0000ffff) {
1403 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1404 " 0x0000ffff reached\n");
1405 spin_unlock(&dev
->t10_alua
.tg_pt_gps_lock
);
1406 kmem_cache_free(t10_alua_tg_pt_gp_cache
, tg_pt_gp
);
1410 tg_pt_gp_id_tmp
= (tg_pt_gp_id
!= 0) ? tg_pt_gp_id
:
1411 dev
->t10_alua
.alua_tg_pt_gps_counter
++;
1413 list_for_each_entry(tg_pt_gp_tmp
, &dev
->t10_alua
.tg_pt_gps_list
,
1415 if (tg_pt_gp_tmp
->tg_pt_gp_id
== tg_pt_gp_id_tmp
) {
1419 pr_err("ALUA Target Port Group ID: %hu already"
1420 " exists, ignoring request\n", tg_pt_gp_id
);
1421 spin_unlock(&dev
->t10_alua
.tg_pt_gps_lock
);
1426 tg_pt_gp
->tg_pt_gp_id
= tg_pt_gp_id_tmp
;
1427 tg_pt_gp
->tg_pt_gp_valid_id
= 1;
1428 list_add_tail(&tg_pt_gp
->tg_pt_gp_list
,
1429 &dev
->t10_alua
.tg_pt_gps_list
);
1430 dev
->t10_alua
.alua_tg_pt_gps_count
++;
1431 spin_unlock(&dev
->t10_alua
.tg_pt_gps_lock
);
1436 struct t10_alua_tg_pt_gp_member
*core_alua_allocate_tg_pt_gp_mem(
1437 struct se_port
*port
)
1439 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
1441 tg_pt_gp_mem
= kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache
,
1443 if (!tg_pt_gp_mem
) {
1444 pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n");
1445 return ERR_PTR(-ENOMEM
);
1447 INIT_LIST_HEAD(&tg_pt_gp_mem
->tg_pt_gp_mem_list
);
1448 spin_lock_init(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1449 atomic_set(&tg_pt_gp_mem
->tg_pt_gp_mem_ref_cnt
, 0);
1451 tg_pt_gp_mem
->tg_pt
= port
;
1452 port
->sep_alua_tg_pt_gp_mem
= tg_pt_gp_mem
;
1454 return tg_pt_gp_mem
;
1457 void core_alua_free_tg_pt_gp(
1458 struct t10_alua_tg_pt_gp
*tg_pt_gp
)
1460 struct se_device
*dev
= tg_pt_gp
->tg_pt_gp_dev
;
1461 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
, *tg_pt_gp_mem_tmp
;
1464 * Once we have reached this point, config_item_put() has already
1465 * been called from target_core_alua_drop_tg_pt_gp().
1467 * Here we remove *tg_pt_gp from the global list so that
1468 * no assications *OR* explict ALUA via SET_TARGET_PORT_GROUPS
1469 * can be made while we are releasing struct t10_alua_tg_pt_gp.
1471 spin_lock(&dev
->t10_alua
.tg_pt_gps_lock
);
1472 list_del(&tg_pt_gp
->tg_pt_gp_list
);
1473 dev
->t10_alua
.alua_tg_pt_gps_counter
--;
1474 spin_unlock(&dev
->t10_alua
.tg_pt_gps_lock
);
1477 * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1478 * core_alua_get_tg_pt_gp_by_name() in
1479 * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1480 * to be released with core_alua_put_tg_pt_gp_from_name().
1482 while (atomic_read(&tg_pt_gp
->tg_pt_gp_ref_cnt
))
1486 * Release reference to struct t10_alua_tg_pt_gp from all associated
1489 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
1490 list_for_each_entry_safe(tg_pt_gp_mem
, tg_pt_gp_mem_tmp
,
1491 &tg_pt_gp
->tg_pt_gp_mem_list
, tg_pt_gp_mem_list
) {
1492 if (tg_pt_gp_mem
->tg_pt_gp_assoc
) {
1493 list_del(&tg_pt_gp_mem
->tg_pt_gp_mem_list
);
1494 tg_pt_gp
->tg_pt_gp_members
--;
1495 tg_pt_gp_mem
->tg_pt_gp_assoc
= 0;
1497 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
1499 * tg_pt_gp_mem is associated with a single
1500 * se_port->sep_alua_tg_pt_gp_mem, and is released via
1501 * core_alua_free_tg_pt_gp_mem().
1503 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1504 * assume we want to re-assocate a given tg_pt_gp_mem with
1507 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1508 if (tg_pt_gp
!= dev
->t10_alua
.default_tg_pt_gp
) {
1509 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem
,
1510 dev
->t10_alua
.default_tg_pt_gp
);
1512 tg_pt_gp_mem
->tg_pt_gp
= NULL
;
1513 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1515 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
1517 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
1519 kmem_cache_free(t10_alua_tg_pt_gp_cache
, tg_pt_gp
);
1522 void core_alua_free_tg_pt_gp_mem(struct se_port
*port
)
1524 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
1525 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
1527 tg_pt_gp_mem
= port
->sep_alua_tg_pt_gp_mem
;
1531 while (atomic_read(&tg_pt_gp_mem
->tg_pt_gp_mem_ref_cnt
))
1534 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1535 tg_pt_gp
= tg_pt_gp_mem
->tg_pt_gp
;
1537 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
1538 if (tg_pt_gp_mem
->tg_pt_gp_assoc
) {
1539 list_del(&tg_pt_gp_mem
->tg_pt_gp_mem_list
);
1540 tg_pt_gp
->tg_pt_gp_members
--;
1541 tg_pt_gp_mem
->tg_pt_gp_assoc
= 0;
1543 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
1544 tg_pt_gp_mem
->tg_pt_gp
= NULL
;
1546 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1548 kmem_cache_free(t10_alua_tg_pt_gp_mem_cache
, tg_pt_gp_mem
);
1551 static struct t10_alua_tg_pt_gp
*core_alua_get_tg_pt_gp_by_name(
1552 struct se_device
*dev
, const char *name
)
1554 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
1555 struct config_item
*ci
;
1557 spin_lock(&dev
->t10_alua
.tg_pt_gps_lock
);
1558 list_for_each_entry(tg_pt_gp
, &dev
->t10_alua
.tg_pt_gps_list
,
1560 if (!tg_pt_gp
->tg_pt_gp_valid_id
)
1562 ci
= &tg_pt_gp
->tg_pt_gp_group
.cg_item
;
1563 if (!strcmp(config_item_name(ci
), name
)) {
1564 atomic_inc(&tg_pt_gp
->tg_pt_gp_ref_cnt
);
1565 spin_unlock(&dev
->t10_alua
.tg_pt_gps_lock
);
1569 spin_unlock(&dev
->t10_alua
.tg_pt_gps_lock
);
1574 static void core_alua_put_tg_pt_gp_from_name(
1575 struct t10_alua_tg_pt_gp
*tg_pt_gp
)
1577 struct se_device
*dev
= tg_pt_gp
->tg_pt_gp_dev
;
1579 spin_lock(&dev
->t10_alua
.tg_pt_gps_lock
);
1580 atomic_dec(&tg_pt_gp
->tg_pt_gp_ref_cnt
);
1581 spin_unlock(&dev
->t10_alua
.tg_pt_gps_lock
);
1585 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1587 void __core_alua_attach_tg_pt_gp_mem(
1588 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
,
1589 struct t10_alua_tg_pt_gp
*tg_pt_gp
)
1591 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
1592 tg_pt_gp_mem
->tg_pt_gp
= tg_pt_gp
;
1593 tg_pt_gp_mem
->tg_pt_gp_assoc
= 1;
1594 list_add_tail(&tg_pt_gp_mem
->tg_pt_gp_mem_list
,
1595 &tg_pt_gp
->tg_pt_gp_mem_list
);
1596 tg_pt_gp
->tg_pt_gp_members
++;
1597 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
1601 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1603 static void __core_alua_drop_tg_pt_gp_mem(
1604 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
,
1605 struct t10_alua_tg_pt_gp
*tg_pt_gp
)
1607 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
1608 list_del(&tg_pt_gp_mem
->tg_pt_gp_mem_list
);
1609 tg_pt_gp_mem
->tg_pt_gp
= NULL
;
1610 tg_pt_gp_mem
->tg_pt_gp_assoc
= 0;
1611 tg_pt_gp
->tg_pt_gp_members
--;
1612 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
1615 ssize_t
core_alua_show_tg_pt_gp_info(struct se_port
*port
, char *page
)
1617 struct config_item
*tg_pt_ci
;
1618 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
1619 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
1622 tg_pt_gp_mem
= port
->sep_alua_tg_pt_gp_mem
;
1626 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1627 tg_pt_gp
= tg_pt_gp_mem
->tg_pt_gp
;
1629 tg_pt_ci
= &tg_pt_gp
->tg_pt_gp_group
.cg_item
;
1630 len
+= sprintf(page
, "TG Port Alias: %s\nTG Port Group ID:"
1631 " %hu\nTG Port Primary Access State: %s\nTG Port "
1632 "Primary Access Status: %s\nTG Port Secondary Access"
1633 " State: %s\nTG Port Secondary Access Status: %s\n",
1634 config_item_name(tg_pt_ci
), tg_pt_gp
->tg_pt_gp_id
,
1635 core_alua_dump_state(atomic_read(
1636 &tg_pt_gp
->tg_pt_gp_alua_access_state
)),
1637 core_alua_dump_status(
1638 tg_pt_gp
->tg_pt_gp_alua_access_status
),
1639 (atomic_read(&port
->sep_tg_pt_secondary_offline
)) ?
1641 core_alua_dump_status(port
->sep_tg_pt_secondary_stat
));
1643 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1648 ssize_t
core_alua_store_tg_pt_gp_info(
1649 struct se_port
*port
,
1653 struct se_portal_group
*tpg
;
1655 struct se_device
*dev
= port
->sep_lun
->lun_se_dev
;
1656 struct t10_alua_tg_pt_gp
*tg_pt_gp
= NULL
, *tg_pt_gp_new
= NULL
;
1657 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
1658 unsigned char buf
[TG_PT_GROUP_NAME_BUF
];
1661 tpg
= port
->sep_tpg
;
1662 lun
= port
->sep_lun
;
1664 tg_pt_gp_mem
= port
->sep_alua_tg_pt_gp_mem
;
1668 if (count
> TG_PT_GROUP_NAME_BUF
) {
1669 pr_err("ALUA Target Port Group alias too large!\n");
1672 memset(buf
, 0, TG_PT_GROUP_NAME_BUF
);
1673 memcpy(buf
, page
, count
);
1675 * Any ALUA target port group alias besides "NULL" means we will be
1676 * making a new group association.
1678 if (strcmp(strstrip(buf
), "NULL")) {
1680 * core_alua_get_tg_pt_gp_by_name() will increment reference to
1681 * struct t10_alua_tg_pt_gp. This reference is released with
1682 * core_alua_put_tg_pt_gp_from_name() below.
1684 tg_pt_gp_new
= core_alua_get_tg_pt_gp_by_name(dev
,
1690 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1691 tg_pt_gp
= tg_pt_gp_mem
->tg_pt_gp
;
1694 * Clearing an existing tg_pt_gp association, and replacing
1695 * with the default_tg_pt_gp.
1697 if (!tg_pt_gp_new
) {
1698 pr_debug("Target_Core_ConfigFS: Moving"
1699 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
1700 " alua/%s, ID: %hu back to"
1701 " default_tg_pt_gp\n",
1702 tpg
->se_tpg_tfo
->tpg_get_wwn(tpg
),
1703 tpg
->se_tpg_tfo
->tpg_get_tag(tpg
),
1704 config_item_name(&lun
->lun_group
.cg_item
),
1706 &tg_pt_gp
->tg_pt_gp_group
.cg_item
),
1707 tg_pt_gp
->tg_pt_gp_id
);
1709 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem
, tg_pt_gp
);
1710 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem
,
1711 dev
->t10_alua
.default_tg_pt_gp
);
1712 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1717 * Removing existing association of tg_pt_gp_mem with tg_pt_gp
1719 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem
, tg_pt_gp
);
1723 * Associate tg_pt_gp_mem with tg_pt_gp_new.
1725 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem
, tg_pt_gp_new
);
1726 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1727 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
1728 " Target Port Group: alua/%s, ID: %hu\n", (move
) ?
1729 "Moving" : "Adding", tpg
->se_tpg_tfo
->tpg_get_wwn(tpg
),
1730 tpg
->se_tpg_tfo
->tpg_get_tag(tpg
),
1731 config_item_name(&lun
->lun_group
.cg_item
),
1732 config_item_name(&tg_pt_gp_new
->tg_pt_gp_group
.cg_item
),
1733 tg_pt_gp_new
->tg_pt_gp_id
);
1735 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new
);
1739 ssize_t
core_alua_show_access_type(
1740 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1743 if ((tg_pt_gp
->tg_pt_gp_alua_access_type
& TPGS_EXPLICT_ALUA
) &&
1744 (tg_pt_gp
->tg_pt_gp_alua_access_type
& TPGS_IMPLICT_ALUA
))
1745 return sprintf(page
, "Implict and Explict\n");
1746 else if (tg_pt_gp
->tg_pt_gp_alua_access_type
& TPGS_IMPLICT_ALUA
)
1747 return sprintf(page
, "Implict\n");
1748 else if (tg_pt_gp
->tg_pt_gp_alua_access_type
& TPGS_EXPLICT_ALUA
)
1749 return sprintf(page
, "Explict\n");
1751 return sprintf(page
, "None\n");
1754 ssize_t
core_alua_store_access_type(
1755 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1762 ret
= kstrtoul(page
, 0, &tmp
);
1764 pr_err("Unable to extract alua_access_type\n");
1767 if ((tmp
!= 0) && (tmp
!= 1) && (tmp
!= 2) && (tmp
!= 3)) {
1768 pr_err("Illegal value for alua_access_type:"
1773 tg_pt_gp
->tg_pt_gp_alua_access_type
=
1774 TPGS_IMPLICT_ALUA
| TPGS_EXPLICT_ALUA
;
1776 tg_pt_gp
->tg_pt_gp_alua_access_type
= TPGS_EXPLICT_ALUA
;
1778 tg_pt_gp
->tg_pt_gp_alua_access_type
= TPGS_IMPLICT_ALUA
;
1780 tg_pt_gp
->tg_pt_gp_alua_access_type
= 0;
1785 ssize_t
core_alua_show_nonop_delay_msecs(
1786 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1789 return sprintf(page
, "%d\n", tg_pt_gp
->tg_pt_gp_nonop_delay_msecs
);
1792 ssize_t
core_alua_store_nonop_delay_msecs(
1793 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1800 ret
= kstrtoul(page
, 0, &tmp
);
1802 pr_err("Unable to extract nonop_delay_msecs\n");
1805 if (tmp
> ALUA_MAX_NONOP_DELAY_MSECS
) {
1806 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
1807 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp
,
1808 ALUA_MAX_NONOP_DELAY_MSECS
);
1811 tg_pt_gp
->tg_pt_gp_nonop_delay_msecs
= (int)tmp
;
1816 ssize_t
core_alua_show_trans_delay_msecs(
1817 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1820 return sprintf(page
, "%d\n", tg_pt_gp
->tg_pt_gp_trans_delay_msecs
);
1823 ssize_t
core_alua_store_trans_delay_msecs(
1824 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1831 ret
= kstrtoul(page
, 0, &tmp
);
1833 pr_err("Unable to extract trans_delay_msecs\n");
1836 if (tmp
> ALUA_MAX_TRANS_DELAY_MSECS
) {
1837 pr_err("Passed trans_delay_msecs: %lu, exceeds"
1838 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp
,
1839 ALUA_MAX_TRANS_DELAY_MSECS
);
1842 tg_pt_gp
->tg_pt_gp_trans_delay_msecs
= (int)tmp
;
1847 ssize_t
core_alua_show_implict_trans_secs(
1848 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1851 return sprintf(page
, "%d\n", tg_pt_gp
->tg_pt_gp_implict_trans_secs
);
1854 ssize_t
core_alua_store_implict_trans_secs(
1855 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1862 ret
= kstrtoul(page
, 0, &tmp
);
1864 pr_err("Unable to extract implict_trans_secs\n");
1867 if (tmp
> ALUA_MAX_IMPLICT_TRANS_SECS
) {
1868 pr_err("Passed implict_trans_secs: %lu, exceeds"
1869 " ALUA_MAX_IMPLICT_TRANS_SECS: %d\n", tmp
,
1870 ALUA_MAX_IMPLICT_TRANS_SECS
);
1873 tg_pt_gp
->tg_pt_gp_implict_trans_secs
= (int)tmp
;
1878 ssize_t
core_alua_show_preferred_bit(
1879 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1882 return sprintf(page
, "%d\n", tg_pt_gp
->tg_pt_gp_pref
);
1885 ssize_t
core_alua_store_preferred_bit(
1886 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1893 ret
= kstrtoul(page
, 0, &tmp
);
1895 pr_err("Unable to extract preferred ALUA value\n");
1898 if ((tmp
!= 0) && (tmp
!= 1)) {
1899 pr_err("Illegal value for preferred ALUA: %lu\n", tmp
);
1902 tg_pt_gp
->tg_pt_gp_pref
= (int)tmp
;
1907 ssize_t
core_alua_show_offline_bit(struct se_lun
*lun
, char *page
)
1912 return sprintf(page
, "%d\n",
1913 atomic_read(&lun
->lun_sep
->sep_tg_pt_secondary_offline
));
1916 ssize_t
core_alua_store_offline_bit(
1921 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
1928 ret
= kstrtoul(page
, 0, &tmp
);
1930 pr_err("Unable to extract alua_tg_pt_offline value\n");
1933 if ((tmp
!= 0) && (tmp
!= 1)) {
1934 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
1938 tg_pt_gp_mem
= lun
->lun_sep
->sep_alua_tg_pt_gp_mem
;
1939 if (!tg_pt_gp_mem
) {
1940 pr_err("Unable to locate *tg_pt_gp_mem\n");
1944 ret
= core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem
,
1945 lun
->lun_sep
, 0, (int)tmp
);
1952 ssize_t
core_alua_show_secondary_status(
1956 return sprintf(page
, "%d\n", lun
->lun_sep
->sep_tg_pt_secondary_stat
);
1959 ssize_t
core_alua_store_secondary_status(
1967 ret
= kstrtoul(page
, 0, &tmp
);
1969 pr_err("Unable to extract alua_tg_pt_status\n");
1972 if ((tmp
!= ALUA_STATUS_NONE
) &&
1973 (tmp
!= ALUA_STATUS_ALTERED_BY_EXPLICT_STPG
) &&
1974 (tmp
!= ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA
)) {
1975 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
1979 lun
->lun_sep
->sep_tg_pt_secondary_stat
= (int)tmp
;
1984 ssize_t
core_alua_show_secondary_write_metadata(
1988 return sprintf(page
, "%d\n",
1989 lun
->lun_sep
->sep_tg_pt_secondary_write_md
);
1992 ssize_t
core_alua_store_secondary_write_metadata(
2000 ret
= kstrtoul(page
, 0, &tmp
);
2002 pr_err("Unable to extract alua_tg_pt_write_md\n");
2005 if ((tmp
!= 0) && (tmp
!= 1)) {
2006 pr_err("Illegal value for alua_tg_pt_write_md:"
2010 lun
->lun_sep
->sep_tg_pt_secondary_write_md
= (int)tmp
;
2015 int core_setup_alua(struct se_device
*dev
)
2017 if (dev
->transport
->transport_type
!= TRANSPORT_PLUGIN_PHBA_PDEV
&&
2018 !(dev
->se_hba
->hba_flags
& HBA_FLAGS_INTERNAL_USE
)) {
2019 struct t10_alua_lu_gp_member
*lu_gp_mem
;
2022 * Associate this struct se_device with the default ALUA
2025 lu_gp_mem
= core_alua_allocate_lu_gp_mem(dev
);
2026 if (IS_ERR(lu_gp_mem
))
2027 return PTR_ERR(lu_gp_mem
);
2029 spin_lock(&lu_gp_mem
->lu_gp_mem_lock
);
2030 __core_alua_attach_lu_gp_mem(lu_gp_mem
,
2032 spin_unlock(&lu_gp_mem
->lu_gp_mem_lock
);
2034 pr_debug("%s: Adding to default ALUA LU Group:"
2035 " core/alua/lu_gps/default_lu_gp\n",
2036 dev
->transport
->name
);