1 /*******************************************************************************
2 * Filename: target_core_alua.c
4 * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA)
6 * Copyright (c) 2009-2010 Rising Tide Systems
7 * Copyright (c) 2009-2010 Linux-iSCSI.org
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/configfs.h>
30 #include <linux/export.h>
31 #include <scsi/scsi.h>
32 #include <scsi/scsi_cmnd.h>
34 #include <target/target_core_base.h>
35 #include <target/target_core_device.h>
36 #include <target/target_core_transport.h>
37 #include <target/target_core_fabric_ops.h>
38 #include <target/target_core_configfs.h>
40 #include "target_core_alua.h"
41 #include "target_core_hba.h"
42 #include "target_core_ua.h"
44 static int 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
62 int target_emulate_report_target_port_groups(struct se_task
*task
)
64 struct se_cmd
*cmd
= task
->task_se_cmd
;
65 struct se_subsystem_dev
*su_dev
= cmd
->se_dev
->se_sub_dev
;
67 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
68 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
70 u32 rd_len
= 0, off
= 4; /* Skip over RESERVED area to first
71 Target port group descriptor */
73 * Need at least 4 bytes of response data or else we can't
74 * even fit the return data length.
76 if (cmd
->data_length
< 4) {
77 pr_warn("REPORT TARGET PORT GROUPS allocation length %u"
78 " too small\n", cmd
->data_length
);
82 buf
= transport_kmap_first_data_page(cmd
);
84 spin_lock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
85 list_for_each_entry(tg_pt_gp
, &su_dev
->t10_alua
.tg_pt_gps_list
,
88 * Check if the Target port group and Target port descriptor list
89 * based on tg_pt_gp_members count will fit into the response payload.
90 * Otherwise, bump rd_len to let the initiator know we have exceeded
91 * the allocation length and the response is truncated.
93 if ((off
+ 8 + (tg_pt_gp
->tg_pt_gp_members
* 4)) >
95 rd_len
+= 8 + (tg_pt_gp
->tg_pt_gp_members
* 4);
99 * PREF: Preferred target port bit, determine if this
100 * bit should be set for port group.
102 if (tg_pt_gp
->tg_pt_gp_pref
)
105 * Set the ASYMMETRIC ACCESS State
107 buf
[off
++] |= (atomic_read(
108 &tg_pt_gp
->tg_pt_gp_alua_access_state
) & 0xff);
110 * Set supported ASYMMETRIC ACCESS State bits
112 buf
[off
] = 0x80; /* T_SUP */
113 buf
[off
] |= 0x40; /* O_SUP */
114 buf
[off
] |= 0x8; /* U_SUP */
115 buf
[off
] |= 0x4; /* S_SUP */
116 buf
[off
] |= 0x2; /* AN_SUP */
117 buf
[off
++] |= 0x1; /* AO_SUP */
121 buf
[off
++] = ((tg_pt_gp
->tg_pt_gp_id
>> 8) & 0xff);
122 buf
[off
++] = (tg_pt_gp
->tg_pt_gp_id
& 0xff);
124 off
++; /* Skip over Reserved */
128 buf
[off
++] = (tg_pt_gp
->tg_pt_gp_alua_access_status
& 0xff);
130 * Vendor Specific field
136 buf
[off
++] = (tg_pt_gp
->tg_pt_gp_members
& 0xff);
139 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
140 list_for_each_entry(tg_pt_gp_mem
, &tg_pt_gp
->tg_pt_gp_mem_list
,
142 port
= tg_pt_gp_mem
->tg_pt
;
144 * Start Target Port descriptor format
146 * See spc4r17 section 6.2.7 Table 247
148 off
+= 2; /* Skip over Obsolete */
150 * Set RELATIVE TARGET PORT IDENTIFIER
152 buf
[off
++] = ((port
->sep_rtpi
>> 8) & 0xff);
153 buf
[off
++] = (port
->sep_rtpi
& 0xff);
156 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
158 spin_unlock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
160 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
162 buf
[0] = ((rd_len
>> 24) & 0xff);
163 buf
[1] = ((rd_len
>> 16) & 0xff);
164 buf
[2] = ((rd_len
>> 8) & 0xff);
165 buf
[3] = (rd_len
& 0xff);
167 transport_kunmap_first_data_page(cmd
);
169 task
->task_scsi_status
= GOOD
;
170 transport_complete_task(task
, 1);
175 * SET_TARGET_PORT_GROUPS for explict ALUA operation.
177 * See spc4r17 section 6.35
179 int target_emulate_set_target_port_groups(struct se_task
*task
)
181 struct se_cmd
*cmd
= task
->task_se_cmd
;
182 struct se_device
*dev
= cmd
->se_dev
;
183 struct se_subsystem_dev
*su_dev
= dev
->se_sub_dev
;
184 struct se_port
*port
, *l_port
= cmd
->se_lun
->lun_sep
;
185 struct se_node_acl
*nacl
= cmd
->se_sess
->se_node_acl
;
186 struct t10_alua_tg_pt_gp
*tg_pt_gp
= NULL
, *l_tg_pt_gp
;
187 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
, *l_tg_pt_gp_mem
;
190 u32 len
= 4; /* Skip over RESERVED area in header */
191 int alua_access_state
, primary
= 0, rc
;
195 cmd
->scsi_sense_reason
= TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE
;
198 buf
= transport_kmap_first_data_page(cmd
);
201 * Determine if explict ALUA via SET_TARGET_PORT_GROUPS is allowed
202 * for the local tg_pt_gp.
204 l_tg_pt_gp_mem
= l_port
->sep_alua_tg_pt_gp_mem
;
205 if (!l_tg_pt_gp_mem
) {
206 pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n");
207 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
211 spin_lock(&l_tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
212 l_tg_pt_gp
= l_tg_pt_gp_mem
->tg_pt_gp
;
214 spin_unlock(&l_tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
215 pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n");
216 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
220 rc
= (l_tg_pt_gp
->tg_pt_gp_alua_access_type
& TPGS_EXPLICT_ALUA
);
221 spin_unlock(&l_tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
224 pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
225 " while TPGS_EXPLICT_ALUA is disabled\n");
226 cmd
->scsi_sense_reason
= TCM_UNSUPPORTED_SCSI_OPCODE
;
231 ptr
= &buf
[4]; /* Skip over RESERVED area in header */
233 while (len
< cmd
->data_length
) {
234 alua_access_state
= (ptr
[0] & 0x0f);
236 * Check the received ALUA access state, and determine if
237 * the state is a primary or secondary target port asymmetric
240 rc
= core_alua_check_transition(alua_access_state
, &primary
);
243 * If the SET TARGET PORT GROUPS attempts to establish
244 * an invalid combination of target port asymmetric
245 * access states or attempts to establish an
246 * unsupported target port asymmetric access state,
247 * then the command shall be terminated with CHECK
248 * CONDITION status, with the sense key set to ILLEGAL
249 * REQUEST, and the additional sense code set to INVALID
250 * FIELD IN PARAMETER LIST.
252 cmd
->scsi_sense_reason
= TCM_INVALID_PARAMETER_LIST
;
258 * If the ASYMMETRIC ACCESS STATE field (see table 267)
259 * specifies a primary target port asymmetric access state,
260 * then the TARGET PORT GROUP OR TARGET PORT field specifies
261 * a primary target port group for which the primary target
262 * port asymmetric access state shall be changed. If the
263 * ASYMMETRIC ACCESS STATE field specifies a secondary target
264 * port asymmetric access state, then the TARGET PORT GROUP OR
265 * TARGET PORT field specifies the relative target port
266 * identifier (see 3.1.120) of the target port for which the
267 * secondary target port asymmetric access state shall be
271 tg_pt_id
= ((ptr
[2] << 8) & 0xff);
272 tg_pt_id
|= (ptr
[3] & 0xff);
274 * Locate the matching target port group ID from
275 * the global tg_pt_gp list
277 spin_lock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
278 list_for_each_entry(tg_pt_gp
,
279 &su_dev
->t10_alua
.tg_pt_gps_list
,
281 if (!tg_pt_gp
->tg_pt_gp_valid_id
)
284 if (tg_pt_id
!= tg_pt_gp
->tg_pt_gp_id
)
287 atomic_inc(&tg_pt_gp
->tg_pt_gp_ref_cnt
);
288 smp_mb__after_atomic_inc();
289 spin_unlock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
291 rc
= core_alua_do_port_transition(tg_pt_gp
,
293 alua_access_state
, 1);
295 spin_lock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
296 atomic_dec(&tg_pt_gp
->tg_pt_gp_ref_cnt
);
297 smp_mb__after_atomic_dec();
300 spin_unlock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
302 * If not matching target port group ID can be located
303 * throw an exception with ASCQ: INVALID_PARAMETER_LIST
306 cmd
->scsi_sense_reason
= TCM_INVALID_PARAMETER_LIST
;
312 * Extact the RELATIVE TARGET PORT IDENTIFIER to identify
313 * the Target Port in question for the the incoming
314 * SET_TARGET_PORT_GROUPS op.
316 rtpi
= ((ptr
[2] << 8) & 0xff);
317 rtpi
|= (ptr
[3] & 0xff);
319 * Locate the matching relative target port identifer
320 * for the struct se_device storage object.
322 spin_lock(&dev
->se_port_lock
);
323 list_for_each_entry(port
, &dev
->dev_sep_list
,
325 if (port
->sep_rtpi
!= rtpi
)
328 tg_pt_gp_mem
= port
->sep_alua_tg_pt_gp_mem
;
329 spin_unlock(&dev
->se_port_lock
);
331 rc
= core_alua_set_tg_pt_secondary_state(
332 tg_pt_gp_mem
, port
, 1, 1);
334 spin_lock(&dev
->se_port_lock
);
337 spin_unlock(&dev
->se_port_lock
);
339 * If not matching relative target port identifier can
340 * be located, throw an exception with ASCQ:
341 * INVALID_PARAMETER_LIST
344 cmd
->scsi_sense_reason
= TCM_INVALID_PARAMETER_LIST
;
355 transport_kunmap_first_data_page(cmd
);
356 task
->task_scsi_status
= GOOD
;
357 transport_complete_task(task
, 1);
361 static inline int core_alua_state_nonoptimized(
364 int nonop_delay_msecs
,
368 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
369 * later to determine if processing of this cmd needs to be
370 * temporarily delayed for the Active/NonOptimized primary access state.
372 cmd
->se_cmd_flags
|= SCF_ALUA_NON_OPTIMIZED
;
373 cmd
->alua_nonop_delay
= nonop_delay_msecs
;
377 static inline int core_alua_state_standby(
383 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
384 * spc4r17 section 5.9.2.4.4
393 case RECEIVE_DIAGNOSTIC
:
394 case SEND_DIAGNOSTIC
:
397 case MI_REPORT_TARGET_PGS
:
400 *alua_ascq
= ASCQ_04H_ALUA_TG_PT_STANDBY
;
403 case MAINTENANCE_OUT
:
405 case MO_SET_TARGET_PGS
:
408 *alua_ascq
= ASCQ_04H_ALUA_TG_PT_STANDBY
;
412 case PERSISTENT_RESERVE_IN
:
413 case PERSISTENT_RESERVE_OUT
:
418 *alua_ascq
= ASCQ_04H_ALUA_TG_PT_STANDBY
;
425 static inline int core_alua_state_unavailable(
431 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
432 * spc4r17 section 5.9.2.4.5
439 case MI_REPORT_TARGET_PGS
:
442 *alua_ascq
= ASCQ_04H_ALUA_TG_PT_UNAVAILABLE
;
445 case MAINTENANCE_OUT
:
447 case MO_SET_TARGET_PGS
:
450 *alua_ascq
= ASCQ_04H_ALUA_TG_PT_UNAVAILABLE
;
458 *alua_ascq
= ASCQ_04H_ALUA_TG_PT_UNAVAILABLE
;
465 static inline int core_alua_state_transition(
471 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITIO as defined by
472 * spc4r17 section 5.9.2.5
479 case MI_REPORT_TARGET_PGS
:
482 *alua_ascq
= ASCQ_04H_ALUA_STATE_TRANSITION
;
490 *alua_ascq
= ASCQ_04H_ALUA_STATE_TRANSITION
;
498 * Used for alua_type SPC_ALUA_PASSTHROUGH and SPC2_ALUA_DISABLED
499 * in transport_cmd_sequencer(). This function is assigned to
500 * struct t10_alua *->state_check() in core_setup_alua()
502 static int core_alua_state_check_nop(
511 * Used for alua_type SPC3_ALUA_EMULATED in transport_cmd_sequencer().
512 * This function is assigned to struct t10_alua *->state_check() in
515 * Also, this function can return three different return codes to
516 * signal transport_generic_cmd_sequencer()
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
522 static int core_alua_state_check(
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
;
536 * First, check for a struct se_port specific secondary ALUA target port
537 * access state: OFFLINE
539 if (atomic_read(&port
->sep_tg_pt_secondary_offline
)) {
540 *alua_ascq
= ASCQ_04H_ALUA_OFFLINE
;
541 pr_debug("ALUA: Got secondary offline status for local"
543 *alua_ascq
= ASCQ_04H_ALUA_OFFLINE
;
547 * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the
548 * ALUA target port group, to obtain current ALUA access state.
549 * Otherwise look for the underlying struct se_device association with
550 * a ALUA logical unit group.
552 tg_pt_gp_mem
= port
->sep_alua_tg_pt_gp_mem
;
553 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
554 tg_pt_gp
= tg_pt_gp_mem
->tg_pt_gp
;
555 out_alua_state
= atomic_read(&tg_pt_gp
->tg_pt_gp_alua_access_state
);
556 nonop_delay_msecs
= tg_pt_gp
->tg_pt_gp_nonop_delay_msecs
;
557 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
559 * Process ALUA_ACCESS_STATE_ACTIVE_OPTMIZED in a separate conditional
560 * statement so the compiler knows explicitly to check this case first.
561 * For the Optimized ALUA access state case, we want to process the
562 * incoming fabric cmd ASAP..
564 if (out_alua_state
== ALUA_ACCESS_STATE_ACTIVE_OPTMIZED
)
567 switch (out_alua_state
) {
568 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED
:
569 return core_alua_state_nonoptimized(cmd
, cdb
,
570 nonop_delay_msecs
, alua_ascq
);
571 case ALUA_ACCESS_STATE_STANDBY
:
572 return core_alua_state_standby(cmd
, cdb
, alua_ascq
);
573 case ALUA_ACCESS_STATE_UNAVAILABLE
:
574 return core_alua_state_unavailable(cmd
, cdb
, alua_ascq
);
575 case ALUA_ACCESS_STATE_TRANSITION
:
576 return core_alua_state_transition(cmd
, cdb
, alua_ascq
);
578 * OFFLINE is a secondary ALUA target port group access state, that is
579 * handled above with struct se_port->sep_tg_pt_secondary_offline=1
581 case ALUA_ACCESS_STATE_OFFLINE
:
583 pr_err("Unknown ALUA access state: 0x%02x\n",
592 * Check implict and explict ALUA state change request.
594 static int core_alua_check_transition(int state
, int *primary
)
597 case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED
:
598 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED
:
599 case ALUA_ACCESS_STATE_STANDBY
:
600 case ALUA_ACCESS_STATE_UNAVAILABLE
:
602 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
603 * defined as primary target port asymmetric access states.
607 case ALUA_ACCESS_STATE_OFFLINE
:
609 * OFFLINE state is defined as a secondary target port
610 * asymmetric access state.
615 pr_err("Unknown ALUA access state: 0x%02x\n", state
);
622 static char *core_alua_dump_state(int state
)
625 case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED
:
626 return "Active/Optimized";
627 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED
:
628 return "Active/NonOptimized";
629 case ALUA_ACCESS_STATE_STANDBY
:
631 case ALUA_ACCESS_STATE_UNAVAILABLE
:
632 return "Unavailable";
633 case ALUA_ACCESS_STATE_OFFLINE
:
642 char *core_alua_dump_status(int status
)
645 case ALUA_STATUS_NONE
:
647 case ALUA_STATUS_ALTERED_BY_EXPLICT_STPG
:
648 return "Altered by Explict STPG";
649 case ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA
:
650 return "Altered by Implict ALUA";
659 * Used by fabric modules to determine when we need to delay processing
660 * for the Active/NonOptimized paths..
662 int core_alua_check_nonop_delay(
665 if (!(cmd
->se_cmd_flags
& SCF_ALUA_NON_OPTIMIZED
))
670 * The ALUA Active/NonOptimized access state delay can be disabled
671 * in via configfs with a value of zero
673 if (!cmd
->alua_nonop_delay
)
676 * struct se_cmd->alua_nonop_delay gets set by a target port group
677 * defined interval in core_alua_state_nonoptimized()
679 msleep_interruptible(cmd
->alua_nonop_delay
);
682 EXPORT_SYMBOL(core_alua_check_nonop_delay
);
685 * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex
688 static int core_alua_write_tpg_metadata(
690 unsigned char *md_buf
,
696 int flags
= O_RDWR
| O_CREAT
| O_TRUNC
, ret
;
698 memset(iov
, 0, sizeof(struct iovec
));
700 file
= filp_open(path
, flags
, 0600);
701 if (IS_ERR(file
) || !file
|| !file
->f_dentry
) {
702 pr_err("filp_open(%s) for ALUA metadata failed\n",
707 iov
[0].iov_base
= &md_buf
[0];
708 iov
[0].iov_len
= md_buf_len
;
712 ret
= vfs_writev(file
, &iov
[0], 1, &file
->f_pos
);
716 pr_err("Error writing ALUA metadata file: %s\n", path
);
717 filp_close(file
, NULL
);
720 filp_close(file
, NULL
);
726 * Called with tg_pt_gp->tg_pt_gp_md_mutex held
728 static int core_alua_update_tpg_primary_metadata(
729 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
731 unsigned char *md_buf
)
733 struct se_subsystem_dev
*su_dev
= tg_pt_gp
->tg_pt_gp_su_dev
;
734 struct t10_wwn
*wwn
= &su_dev
->t10_wwn
;
735 char path
[ALUA_METADATA_PATH_LEN
];
738 memset(path
, 0, ALUA_METADATA_PATH_LEN
);
740 len
= snprintf(md_buf
, tg_pt_gp
->tg_pt_gp_md_buf_len
,
742 "alua_access_state=0x%02x\n"
743 "alua_access_status=0x%02x\n",
744 tg_pt_gp
->tg_pt_gp_id
, primary_state
,
745 tg_pt_gp
->tg_pt_gp_alua_access_status
);
747 snprintf(path
, ALUA_METADATA_PATH_LEN
,
748 "/var/target/alua/tpgs_%s/%s", &wwn
->unit_serial
[0],
749 config_item_name(&tg_pt_gp
->tg_pt_gp_group
.cg_item
));
751 return core_alua_write_tpg_metadata(path
, md_buf
, len
);
754 static int core_alua_do_transition_tg_pt(
755 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
756 struct se_port
*l_port
,
757 struct se_node_acl
*nacl
,
758 unsigned char *md_buf
,
762 struct se_dev_entry
*se_deve
;
763 struct se_lun_acl
*lacl
;
764 struct se_port
*port
;
765 struct t10_alua_tg_pt_gp_member
*mem
;
768 * Save the old primary ALUA access state, and set the current state
769 * to ALUA_ACCESS_STATE_TRANSITION.
771 old_state
= atomic_read(&tg_pt_gp
->tg_pt_gp_alua_access_state
);
772 atomic_set(&tg_pt_gp
->tg_pt_gp_alua_access_state
,
773 ALUA_ACCESS_STATE_TRANSITION
);
774 tg_pt_gp
->tg_pt_gp_alua_access_status
= (explict
) ?
775 ALUA_STATUS_ALTERED_BY_EXPLICT_STPG
:
776 ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA
;
778 * Check for the optional ALUA primary state transition delay
780 if (tg_pt_gp
->tg_pt_gp_trans_delay_msecs
!= 0)
781 msleep_interruptible(tg_pt_gp
->tg_pt_gp_trans_delay_msecs
);
783 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
784 list_for_each_entry(mem
, &tg_pt_gp
->tg_pt_gp_mem_list
,
788 * After an implicit target port asymmetric access state
789 * change, a device server shall establish a unit attention
790 * condition for the initiator port associated with every I_T
791 * nexus with the additional sense code set to ASYMMETRIC
792 * ACCESS STATE CHAGED.
794 * After an explicit target port asymmetric access state
795 * change, a device server shall establish a unit attention
796 * condition with the additional sense code set to ASYMMETRIC
797 * ACCESS STATE CHANGED for the initiator port associated with
798 * every I_T nexus other than the I_T nexus on which the SET
799 * TARGET PORT GROUPS command
801 atomic_inc(&mem
->tg_pt_gp_mem_ref_cnt
);
802 smp_mb__after_atomic_inc();
803 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
805 spin_lock_bh(&port
->sep_alua_lock
);
806 list_for_each_entry(se_deve
, &port
->sep_alua_list
,
808 lacl
= se_deve
->se_lun_acl
;
810 * se_deve->se_lun_acl pointer may be NULL for a
811 * entry created without explict Node+MappedLUN ACLs
817 (nacl
!= NULL
) && (nacl
== lacl
->se_lun_nacl
) &&
818 (l_port
!= NULL
) && (l_port
== port
))
821 core_scsi3_ua_allocate(lacl
->se_lun_nacl
,
822 se_deve
->mapped_lun
, 0x2A,
823 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED
);
825 spin_unlock_bh(&port
->sep_alua_lock
);
827 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
828 atomic_dec(&mem
->tg_pt_gp_mem_ref_cnt
);
829 smp_mb__after_atomic_dec();
831 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
833 * Update the ALUA metadata buf that has been allocated in
834 * core_alua_do_port_transition(), this metadata will be written
837 * Note that there is the case where we do not want to update the
838 * metadata when the saved metadata is being parsed in userspace
839 * when setting the existing port access state and access status.
841 * Also note that the failure to write out the ALUA metadata to
842 * struct file does NOT affect the actual ALUA transition.
844 if (tg_pt_gp
->tg_pt_gp_write_metadata
) {
845 mutex_lock(&tg_pt_gp
->tg_pt_gp_md_mutex
);
846 core_alua_update_tpg_primary_metadata(tg_pt_gp
,
848 mutex_unlock(&tg_pt_gp
->tg_pt_gp_md_mutex
);
851 * Set the current primary ALUA access state to the requested new state
853 atomic_set(&tg_pt_gp
->tg_pt_gp_alua_access_state
, new_state
);
855 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
856 " from primary access state %s to %s\n", (explict
) ? "explict" :
857 "implict", config_item_name(&tg_pt_gp
->tg_pt_gp_group
.cg_item
),
858 tg_pt_gp
->tg_pt_gp_id
, core_alua_dump_state(old_state
),
859 core_alua_dump_state(new_state
));
864 int core_alua_do_port_transition(
865 struct t10_alua_tg_pt_gp
*l_tg_pt_gp
,
866 struct se_device
*l_dev
,
867 struct se_port
*l_port
,
868 struct se_node_acl
*l_nacl
,
872 struct se_device
*dev
;
873 struct se_port
*port
;
874 struct se_subsystem_dev
*su_dev
;
875 struct se_node_acl
*nacl
;
876 struct t10_alua_lu_gp
*lu_gp
;
877 struct t10_alua_lu_gp_member
*lu_gp_mem
, *local_lu_gp_mem
;
878 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
879 unsigned char *md_buf
;
882 if (core_alua_check_transition(new_state
, &primary
) != 0)
885 md_buf
= kzalloc(l_tg_pt_gp
->tg_pt_gp_md_buf_len
, GFP_KERNEL
);
887 pr_err("Unable to allocate buf for ALUA metadata\n");
891 local_lu_gp_mem
= l_dev
->dev_alua_lu_gp_mem
;
892 spin_lock(&local_lu_gp_mem
->lu_gp_mem_lock
);
893 lu_gp
= local_lu_gp_mem
->lu_gp
;
894 atomic_inc(&lu_gp
->lu_gp_ref_cnt
);
895 smp_mb__after_atomic_inc();
896 spin_unlock(&local_lu_gp_mem
->lu_gp_mem_lock
);
898 * For storage objects that are members of the 'default_lu_gp',
899 * we only do transition on the passed *l_tp_pt_gp, and not
900 * on all of the matching target port groups IDs in default_lu_gp.
902 if (!lu_gp
->lu_gp_id
) {
904 * core_alua_do_transition_tg_pt() will always return
907 core_alua_do_transition_tg_pt(l_tg_pt_gp
, l_port
, l_nacl
,
908 md_buf
, new_state
, explict
);
909 atomic_dec(&lu_gp
->lu_gp_ref_cnt
);
910 smp_mb__after_atomic_dec();
915 * For all other LU groups aside from 'default_lu_gp', walk all of
916 * the associated storage objects looking for a matching target port
917 * group ID from the local target port group.
919 spin_lock(&lu_gp
->lu_gp_lock
);
920 list_for_each_entry(lu_gp_mem
, &lu_gp
->lu_gp_mem_list
,
923 dev
= lu_gp_mem
->lu_gp_mem_dev
;
924 su_dev
= dev
->se_sub_dev
;
925 atomic_inc(&lu_gp_mem
->lu_gp_mem_ref_cnt
);
926 smp_mb__after_atomic_inc();
927 spin_unlock(&lu_gp
->lu_gp_lock
);
929 spin_lock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
930 list_for_each_entry(tg_pt_gp
,
931 &su_dev
->t10_alua
.tg_pt_gps_list
,
934 if (!tg_pt_gp
->tg_pt_gp_valid_id
)
937 * If the target behavior port asymmetric access state
938 * is changed for any target port group accessiable via
939 * a logical unit within a LU group, the target port
940 * behavior group asymmetric access states for the same
941 * target port group accessible via other logical units
942 * in that LU group will also change.
944 if (l_tg_pt_gp
->tg_pt_gp_id
!= tg_pt_gp
->tg_pt_gp_id
)
947 if (l_tg_pt_gp
== tg_pt_gp
) {
954 atomic_inc(&tg_pt_gp
->tg_pt_gp_ref_cnt
);
955 smp_mb__after_atomic_inc();
956 spin_unlock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
958 * core_alua_do_transition_tg_pt() will always return
961 core_alua_do_transition_tg_pt(tg_pt_gp
, port
,
962 nacl
, md_buf
, new_state
, explict
);
964 spin_lock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
965 atomic_dec(&tg_pt_gp
->tg_pt_gp_ref_cnt
);
966 smp_mb__after_atomic_dec();
968 spin_unlock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
970 spin_lock(&lu_gp
->lu_gp_lock
);
971 atomic_dec(&lu_gp_mem
->lu_gp_mem_ref_cnt
);
972 smp_mb__after_atomic_dec();
974 spin_unlock(&lu_gp
->lu_gp_lock
);
976 pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
977 " Group IDs: %hu %s transition to primary state: %s\n",
978 config_item_name(&lu_gp
->lu_gp_group
.cg_item
),
979 l_tg_pt_gp
->tg_pt_gp_id
, (explict
) ? "explict" : "implict",
980 core_alua_dump_state(new_state
));
982 atomic_dec(&lu_gp
->lu_gp_ref_cnt
);
983 smp_mb__after_atomic_dec();
989 * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held
991 static int core_alua_update_tpg_secondary_metadata(
992 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
,
993 struct se_port
*port
,
994 unsigned char *md_buf
,
997 struct se_portal_group
*se_tpg
= port
->sep_tpg
;
998 char path
[ALUA_METADATA_PATH_LEN
], wwn
[ALUA_SECONDARY_METADATA_WWN_LEN
];
1001 memset(path
, 0, ALUA_METADATA_PATH_LEN
);
1002 memset(wwn
, 0, ALUA_SECONDARY_METADATA_WWN_LEN
);
1004 len
= snprintf(wwn
, ALUA_SECONDARY_METADATA_WWN_LEN
, "%s",
1005 se_tpg
->se_tpg_tfo
->tpg_get_wwn(se_tpg
));
1007 if (se_tpg
->se_tpg_tfo
->tpg_get_tag
!= NULL
)
1008 snprintf(wwn
+len
, ALUA_SECONDARY_METADATA_WWN_LEN
-len
, "+%hu",
1009 se_tpg
->se_tpg_tfo
->tpg_get_tag(se_tpg
));
1011 len
= snprintf(md_buf
, md_buf_len
, "alua_tg_pt_offline=%d\n"
1012 "alua_tg_pt_status=0x%02x\n",
1013 atomic_read(&port
->sep_tg_pt_secondary_offline
),
1014 port
->sep_tg_pt_secondary_stat
);
1016 snprintf(path
, ALUA_METADATA_PATH_LEN
, "/var/target/alua/%s/%s/lun_%u",
1017 se_tpg
->se_tpg_tfo
->get_fabric_name(), wwn
,
1018 port
->sep_lun
->unpacked_lun
);
1020 return core_alua_write_tpg_metadata(path
, md_buf
, len
);
1023 static int core_alua_set_tg_pt_secondary_state(
1024 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
,
1025 struct se_port
*port
,
1029 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
1030 unsigned char *md_buf
;
1032 int trans_delay_msecs
;
1034 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1035 tg_pt_gp
= tg_pt_gp_mem
->tg_pt_gp
;
1037 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1038 pr_err("Unable to complete secondary state"
1042 trans_delay_msecs
= tg_pt_gp
->tg_pt_gp_trans_delay_msecs
;
1044 * Set the secondary ALUA target port access state to OFFLINE
1045 * or release the previously secondary state for struct se_port
1048 atomic_set(&port
->sep_tg_pt_secondary_offline
, 1);
1050 atomic_set(&port
->sep_tg_pt_secondary_offline
, 0);
1052 md_buf_len
= tg_pt_gp
->tg_pt_gp_md_buf_len
;
1053 port
->sep_tg_pt_secondary_stat
= (explict
) ?
1054 ALUA_STATUS_ALTERED_BY_EXPLICT_STPG
:
1055 ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA
;
1057 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1058 " to secondary access state: %s\n", (explict
) ? "explict" :
1059 "implict", config_item_name(&tg_pt_gp
->tg_pt_gp_group
.cg_item
),
1060 tg_pt_gp
->tg_pt_gp_id
, (offline
) ? "OFFLINE" : "ONLINE");
1062 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1064 * Do the optional transition delay after we set the secondary
1065 * ALUA access state.
1067 if (trans_delay_msecs
!= 0)
1068 msleep_interruptible(trans_delay_msecs
);
1070 * See if we need to update the ALUA fabric port metadata for
1071 * secondary state and status
1073 if (port
->sep_tg_pt_secondary_write_md
) {
1074 md_buf
= kzalloc(md_buf_len
, GFP_KERNEL
);
1076 pr_err("Unable to allocate md_buf for"
1077 " secondary ALUA access metadata\n");
1080 mutex_lock(&port
->sep_tg_pt_md_mutex
);
1081 core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem
, port
,
1082 md_buf
, md_buf_len
);
1083 mutex_unlock(&port
->sep_tg_pt_md_mutex
);
1091 struct t10_alua_lu_gp
*
1092 core_alua_allocate_lu_gp(const char *name
, int def_group
)
1094 struct t10_alua_lu_gp
*lu_gp
;
1096 lu_gp
= kmem_cache_zalloc(t10_alua_lu_gp_cache
, GFP_KERNEL
);
1098 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1099 return ERR_PTR(-ENOMEM
);
1101 INIT_LIST_HEAD(&lu_gp
->lu_gp_node
);
1102 INIT_LIST_HEAD(&lu_gp
->lu_gp_mem_list
);
1103 spin_lock_init(&lu_gp
->lu_gp_lock
);
1104 atomic_set(&lu_gp
->lu_gp_ref_cnt
, 0);
1107 lu_gp
->lu_gp_id
= alua_lu_gps_counter
++;
1108 lu_gp
->lu_gp_valid_id
= 1;
1109 alua_lu_gps_count
++;
1115 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp
*lu_gp
, u16 lu_gp_id
)
1117 struct t10_alua_lu_gp
*lu_gp_tmp
;
1120 * The lu_gp->lu_gp_id may only be set once..
1122 if (lu_gp
->lu_gp_valid_id
) {
1123 pr_warn("ALUA LU Group already has a valid ID,"
1124 " ignoring request\n");
1128 spin_lock(&lu_gps_lock
);
1129 if (alua_lu_gps_count
== 0x0000ffff) {
1130 pr_err("Maximum ALUA alua_lu_gps_count:"
1131 " 0x0000ffff reached\n");
1132 spin_unlock(&lu_gps_lock
);
1133 kmem_cache_free(t10_alua_lu_gp_cache
, lu_gp
);
1137 lu_gp_id_tmp
= (lu_gp_id
!= 0) ? lu_gp_id
:
1138 alua_lu_gps_counter
++;
1140 list_for_each_entry(lu_gp_tmp
, &lu_gps_list
, lu_gp_node
) {
1141 if (lu_gp_tmp
->lu_gp_id
== lu_gp_id_tmp
) {
1145 pr_warn("ALUA Logical Unit Group ID: %hu"
1146 " already exists, ignoring request\n",
1148 spin_unlock(&lu_gps_lock
);
1153 lu_gp
->lu_gp_id
= lu_gp_id_tmp
;
1154 lu_gp
->lu_gp_valid_id
= 1;
1155 list_add_tail(&lu_gp
->lu_gp_node
, &lu_gps_list
);
1156 alua_lu_gps_count
++;
1157 spin_unlock(&lu_gps_lock
);
1162 static struct t10_alua_lu_gp_member
*
1163 core_alua_allocate_lu_gp_mem(struct se_device
*dev
)
1165 struct t10_alua_lu_gp_member
*lu_gp_mem
;
1167 lu_gp_mem
= kmem_cache_zalloc(t10_alua_lu_gp_mem_cache
, GFP_KERNEL
);
1169 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1170 return ERR_PTR(-ENOMEM
);
1172 INIT_LIST_HEAD(&lu_gp_mem
->lu_gp_mem_list
);
1173 spin_lock_init(&lu_gp_mem
->lu_gp_mem_lock
);
1174 atomic_set(&lu_gp_mem
->lu_gp_mem_ref_cnt
, 0);
1176 lu_gp_mem
->lu_gp_mem_dev
= dev
;
1177 dev
->dev_alua_lu_gp_mem
= lu_gp_mem
;
1182 void core_alua_free_lu_gp(struct t10_alua_lu_gp
*lu_gp
)
1184 struct t10_alua_lu_gp_member
*lu_gp_mem
, *lu_gp_mem_tmp
;
1186 * Once we have reached this point, config_item_put() has
1187 * already been called from target_core_alua_drop_lu_gp().
1189 * Here, we remove the *lu_gp from the global list so that
1190 * no associations can be made while we are releasing
1191 * struct t10_alua_lu_gp.
1193 spin_lock(&lu_gps_lock
);
1194 atomic_set(&lu_gp
->lu_gp_shutdown
, 1);
1195 list_del(&lu_gp
->lu_gp_node
);
1196 alua_lu_gps_count
--;
1197 spin_unlock(&lu_gps_lock
);
1199 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1200 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1201 * released with core_alua_put_lu_gp_from_name()
1203 while (atomic_read(&lu_gp
->lu_gp_ref_cnt
))
1206 * Release reference to struct t10_alua_lu_gp * from all associated
1209 spin_lock(&lu_gp
->lu_gp_lock
);
1210 list_for_each_entry_safe(lu_gp_mem
, lu_gp_mem_tmp
,
1211 &lu_gp
->lu_gp_mem_list
, lu_gp_mem_list
) {
1212 if (lu_gp_mem
->lu_gp_assoc
) {
1213 list_del(&lu_gp_mem
->lu_gp_mem_list
);
1214 lu_gp
->lu_gp_members
--;
1215 lu_gp_mem
->lu_gp_assoc
= 0;
1217 spin_unlock(&lu_gp
->lu_gp_lock
);
1220 * lu_gp_mem is associated with a single
1221 * struct se_device->dev_alua_lu_gp_mem, and is released when
1222 * struct se_device is released via core_alua_free_lu_gp_mem().
1224 * If the passed lu_gp does NOT match the default_lu_gp, assume
1225 * we want to re-assocate a given lu_gp_mem with default_lu_gp.
1227 spin_lock(&lu_gp_mem
->lu_gp_mem_lock
);
1228 if (lu_gp
!= default_lu_gp
)
1229 __core_alua_attach_lu_gp_mem(lu_gp_mem
,
1232 lu_gp_mem
->lu_gp
= NULL
;
1233 spin_unlock(&lu_gp_mem
->lu_gp_mem_lock
);
1235 spin_lock(&lu_gp
->lu_gp_lock
);
1237 spin_unlock(&lu_gp
->lu_gp_lock
);
1239 kmem_cache_free(t10_alua_lu_gp_cache
, lu_gp
);
1242 void core_alua_free_lu_gp_mem(struct se_device
*dev
)
1244 struct se_subsystem_dev
*su_dev
= dev
->se_sub_dev
;
1245 struct t10_alua
*alua
= &su_dev
->t10_alua
;
1246 struct t10_alua_lu_gp
*lu_gp
;
1247 struct t10_alua_lu_gp_member
*lu_gp_mem
;
1249 if (alua
->alua_type
!= SPC3_ALUA_EMULATED
)
1252 lu_gp_mem
= dev
->dev_alua_lu_gp_mem
;
1256 while (atomic_read(&lu_gp_mem
->lu_gp_mem_ref_cnt
))
1259 spin_lock(&lu_gp_mem
->lu_gp_mem_lock
);
1260 lu_gp
= lu_gp_mem
->lu_gp
;
1262 spin_lock(&lu_gp
->lu_gp_lock
);
1263 if (lu_gp_mem
->lu_gp_assoc
) {
1264 list_del(&lu_gp_mem
->lu_gp_mem_list
);
1265 lu_gp
->lu_gp_members
--;
1266 lu_gp_mem
->lu_gp_assoc
= 0;
1268 spin_unlock(&lu_gp
->lu_gp_lock
);
1269 lu_gp_mem
->lu_gp
= NULL
;
1271 spin_unlock(&lu_gp_mem
->lu_gp_mem_lock
);
1273 kmem_cache_free(t10_alua_lu_gp_mem_cache
, lu_gp_mem
);
1276 struct t10_alua_lu_gp
*core_alua_get_lu_gp_by_name(const char *name
)
1278 struct t10_alua_lu_gp
*lu_gp
;
1279 struct config_item
*ci
;
1281 spin_lock(&lu_gps_lock
);
1282 list_for_each_entry(lu_gp
, &lu_gps_list
, lu_gp_node
) {
1283 if (!lu_gp
->lu_gp_valid_id
)
1285 ci
= &lu_gp
->lu_gp_group
.cg_item
;
1286 if (!strcmp(config_item_name(ci
), name
)) {
1287 atomic_inc(&lu_gp
->lu_gp_ref_cnt
);
1288 spin_unlock(&lu_gps_lock
);
1292 spin_unlock(&lu_gps_lock
);
1297 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp
*lu_gp
)
1299 spin_lock(&lu_gps_lock
);
1300 atomic_dec(&lu_gp
->lu_gp_ref_cnt
);
1301 spin_unlock(&lu_gps_lock
);
1305 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1307 void __core_alua_attach_lu_gp_mem(
1308 struct t10_alua_lu_gp_member
*lu_gp_mem
,
1309 struct t10_alua_lu_gp
*lu_gp
)
1311 spin_lock(&lu_gp
->lu_gp_lock
);
1312 lu_gp_mem
->lu_gp
= lu_gp
;
1313 lu_gp_mem
->lu_gp_assoc
= 1;
1314 list_add_tail(&lu_gp_mem
->lu_gp_mem_list
, &lu_gp
->lu_gp_mem_list
);
1315 lu_gp
->lu_gp_members
++;
1316 spin_unlock(&lu_gp
->lu_gp_lock
);
1320 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1322 void __core_alua_drop_lu_gp_mem(
1323 struct t10_alua_lu_gp_member
*lu_gp_mem
,
1324 struct t10_alua_lu_gp
*lu_gp
)
1326 spin_lock(&lu_gp
->lu_gp_lock
);
1327 list_del(&lu_gp_mem
->lu_gp_mem_list
);
1328 lu_gp_mem
->lu_gp
= NULL
;
1329 lu_gp_mem
->lu_gp_assoc
= 0;
1330 lu_gp
->lu_gp_members
--;
1331 spin_unlock(&lu_gp
->lu_gp_lock
);
1334 struct t10_alua_tg_pt_gp
*core_alua_allocate_tg_pt_gp(
1335 struct se_subsystem_dev
*su_dev
,
1339 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
1341 tg_pt_gp
= kmem_cache_zalloc(t10_alua_tg_pt_gp_cache
, GFP_KERNEL
);
1343 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1346 INIT_LIST_HEAD(&tg_pt_gp
->tg_pt_gp_list
);
1347 INIT_LIST_HEAD(&tg_pt_gp
->tg_pt_gp_mem_list
);
1348 mutex_init(&tg_pt_gp
->tg_pt_gp_md_mutex
);
1349 spin_lock_init(&tg_pt_gp
->tg_pt_gp_lock
);
1350 atomic_set(&tg_pt_gp
->tg_pt_gp_ref_cnt
, 0);
1351 tg_pt_gp
->tg_pt_gp_su_dev
= su_dev
;
1352 tg_pt_gp
->tg_pt_gp_md_buf_len
= ALUA_MD_BUF_LEN
;
1353 atomic_set(&tg_pt_gp
->tg_pt_gp_alua_access_state
,
1354 ALUA_ACCESS_STATE_ACTIVE_OPTMIZED
);
1356 * Enable both explict and implict ALUA support by default
1358 tg_pt_gp
->tg_pt_gp_alua_access_type
=
1359 TPGS_EXPLICT_ALUA
| TPGS_IMPLICT_ALUA
;
1361 * Set the default Active/NonOptimized Delay in milliseconds
1363 tg_pt_gp
->tg_pt_gp_nonop_delay_msecs
= ALUA_DEFAULT_NONOP_DELAY_MSECS
;
1364 tg_pt_gp
->tg_pt_gp_trans_delay_msecs
= ALUA_DEFAULT_TRANS_DELAY_MSECS
;
1367 spin_lock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
1368 tg_pt_gp
->tg_pt_gp_id
=
1369 su_dev
->t10_alua
.alua_tg_pt_gps_counter
++;
1370 tg_pt_gp
->tg_pt_gp_valid_id
= 1;
1371 su_dev
->t10_alua
.alua_tg_pt_gps_count
++;
1372 list_add_tail(&tg_pt_gp
->tg_pt_gp_list
,
1373 &su_dev
->t10_alua
.tg_pt_gps_list
);
1374 spin_unlock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
1380 int core_alua_set_tg_pt_gp_id(
1381 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1384 struct se_subsystem_dev
*su_dev
= tg_pt_gp
->tg_pt_gp_su_dev
;
1385 struct t10_alua_tg_pt_gp
*tg_pt_gp_tmp
;
1386 u16 tg_pt_gp_id_tmp
;
1388 * The tg_pt_gp->tg_pt_gp_id may only be set once..
1390 if (tg_pt_gp
->tg_pt_gp_valid_id
) {
1391 pr_warn("ALUA TG PT Group already has a valid ID,"
1392 " ignoring request\n");
1396 spin_lock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
1397 if (su_dev
->t10_alua
.alua_tg_pt_gps_count
== 0x0000ffff) {
1398 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1399 " 0x0000ffff reached\n");
1400 spin_unlock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
1401 kmem_cache_free(t10_alua_tg_pt_gp_cache
, tg_pt_gp
);
1405 tg_pt_gp_id_tmp
= (tg_pt_gp_id
!= 0) ? tg_pt_gp_id
:
1406 su_dev
->t10_alua
.alua_tg_pt_gps_counter
++;
1408 list_for_each_entry(tg_pt_gp_tmp
, &su_dev
->t10_alua
.tg_pt_gps_list
,
1410 if (tg_pt_gp_tmp
->tg_pt_gp_id
== tg_pt_gp_id_tmp
) {
1414 pr_err("ALUA Target Port Group ID: %hu already"
1415 " exists, ignoring request\n", tg_pt_gp_id
);
1416 spin_unlock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
1421 tg_pt_gp
->tg_pt_gp_id
= tg_pt_gp_id_tmp
;
1422 tg_pt_gp
->tg_pt_gp_valid_id
= 1;
1423 list_add_tail(&tg_pt_gp
->tg_pt_gp_list
,
1424 &su_dev
->t10_alua
.tg_pt_gps_list
);
1425 su_dev
->t10_alua
.alua_tg_pt_gps_count
++;
1426 spin_unlock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
1431 struct t10_alua_tg_pt_gp_member
*core_alua_allocate_tg_pt_gp_mem(
1432 struct se_port
*port
)
1434 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
1436 tg_pt_gp_mem
= kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache
,
1438 if (!tg_pt_gp_mem
) {
1439 pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n");
1440 return ERR_PTR(-ENOMEM
);
1442 INIT_LIST_HEAD(&tg_pt_gp_mem
->tg_pt_gp_mem_list
);
1443 spin_lock_init(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1444 atomic_set(&tg_pt_gp_mem
->tg_pt_gp_mem_ref_cnt
, 0);
1446 tg_pt_gp_mem
->tg_pt
= port
;
1447 port
->sep_alua_tg_pt_gp_mem
= tg_pt_gp_mem
;
1448 atomic_set(&port
->sep_tg_pt_gp_active
, 1);
1450 return tg_pt_gp_mem
;
1453 void core_alua_free_tg_pt_gp(
1454 struct t10_alua_tg_pt_gp
*tg_pt_gp
)
1456 struct se_subsystem_dev
*su_dev
= tg_pt_gp
->tg_pt_gp_su_dev
;
1457 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
, *tg_pt_gp_mem_tmp
;
1459 * Once we have reached this point, config_item_put() has already
1460 * been called from target_core_alua_drop_tg_pt_gp().
1462 * Here we remove *tg_pt_gp from the global list so that
1463 * no assications *OR* explict ALUA via SET_TARGET_PORT_GROUPS
1464 * can be made while we are releasing struct t10_alua_tg_pt_gp.
1466 spin_lock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
1467 list_del(&tg_pt_gp
->tg_pt_gp_list
);
1468 su_dev
->t10_alua
.alua_tg_pt_gps_counter
--;
1469 spin_unlock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
1471 * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1472 * core_alua_get_tg_pt_gp_by_name() in
1473 * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1474 * to be released with core_alua_put_tg_pt_gp_from_name().
1476 while (atomic_read(&tg_pt_gp
->tg_pt_gp_ref_cnt
))
1479 * Release reference to struct t10_alua_tg_pt_gp from all associated
1482 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
1483 list_for_each_entry_safe(tg_pt_gp_mem
, tg_pt_gp_mem_tmp
,
1484 &tg_pt_gp
->tg_pt_gp_mem_list
, tg_pt_gp_mem_list
) {
1485 if (tg_pt_gp_mem
->tg_pt_gp_assoc
) {
1486 list_del(&tg_pt_gp_mem
->tg_pt_gp_mem_list
);
1487 tg_pt_gp
->tg_pt_gp_members
--;
1488 tg_pt_gp_mem
->tg_pt_gp_assoc
= 0;
1490 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
1492 * tg_pt_gp_mem is associated with a single
1493 * se_port->sep_alua_tg_pt_gp_mem, and is released via
1494 * core_alua_free_tg_pt_gp_mem().
1496 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1497 * assume we want to re-assocate a given tg_pt_gp_mem with
1500 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1501 if (tg_pt_gp
!= su_dev
->t10_alua
.default_tg_pt_gp
) {
1502 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem
,
1503 su_dev
->t10_alua
.default_tg_pt_gp
);
1505 tg_pt_gp_mem
->tg_pt_gp
= NULL
;
1506 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1508 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
1510 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
1512 kmem_cache_free(t10_alua_tg_pt_gp_cache
, tg_pt_gp
);
1515 void core_alua_free_tg_pt_gp_mem(struct se_port
*port
)
1517 struct se_subsystem_dev
*su_dev
= port
->sep_lun
->lun_se_dev
->se_sub_dev
;
1518 struct t10_alua
*alua
= &su_dev
->t10_alua
;
1519 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
1520 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
1522 if (alua
->alua_type
!= SPC3_ALUA_EMULATED
)
1525 tg_pt_gp_mem
= port
->sep_alua_tg_pt_gp_mem
;
1529 while (atomic_read(&tg_pt_gp_mem
->tg_pt_gp_mem_ref_cnt
))
1532 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1533 tg_pt_gp
= tg_pt_gp_mem
->tg_pt_gp
;
1535 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
1536 if (tg_pt_gp_mem
->tg_pt_gp_assoc
) {
1537 list_del(&tg_pt_gp_mem
->tg_pt_gp_mem_list
);
1538 tg_pt_gp
->tg_pt_gp_members
--;
1539 tg_pt_gp_mem
->tg_pt_gp_assoc
= 0;
1541 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
1542 tg_pt_gp_mem
->tg_pt_gp
= NULL
;
1544 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1546 kmem_cache_free(t10_alua_tg_pt_gp_mem_cache
, tg_pt_gp_mem
);
1549 static struct t10_alua_tg_pt_gp
*core_alua_get_tg_pt_gp_by_name(
1550 struct se_subsystem_dev
*su_dev
,
1553 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
1554 struct config_item
*ci
;
1556 spin_lock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
1557 list_for_each_entry(tg_pt_gp
, &su_dev
->t10_alua
.tg_pt_gps_list
,
1559 if (!tg_pt_gp
->tg_pt_gp_valid_id
)
1561 ci
= &tg_pt_gp
->tg_pt_gp_group
.cg_item
;
1562 if (!strcmp(config_item_name(ci
), name
)) {
1563 atomic_inc(&tg_pt_gp
->tg_pt_gp_ref_cnt
);
1564 spin_unlock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
1568 spin_unlock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
1573 static void core_alua_put_tg_pt_gp_from_name(
1574 struct t10_alua_tg_pt_gp
*tg_pt_gp
)
1576 struct se_subsystem_dev
*su_dev
= tg_pt_gp
->tg_pt_gp_su_dev
;
1578 spin_lock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
1579 atomic_dec(&tg_pt_gp
->tg_pt_gp_ref_cnt
);
1580 spin_unlock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
1584 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1586 void __core_alua_attach_tg_pt_gp_mem(
1587 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
,
1588 struct t10_alua_tg_pt_gp
*tg_pt_gp
)
1590 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
1591 tg_pt_gp_mem
->tg_pt_gp
= tg_pt_gp
;
1592 tg_pt_gp_mem
->tg_pt_gp_assoc
= 1;
1593 list_add_tail(&tg_pt_gp_mem
->tg_pt_gp_mem_list
,
1594 &tg_pt_gp
->tg_pt_gp_mem_list
);
1595 tg_pt_gp
->tg_pt_gp_members
++;
1596 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
1600 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1602 static void __core_alua_drop_tg_pt_gp_mem(
1603 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
,
1604 struct t10_alua_tg_pt_gp
*tg_pt_gp
)
1606 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
1607 list_del(&tg_pt_gp_mem
->tg_pt_gp_mem_list
);
1608 tg_pt_gp_mem
->tg_pt_gp
= NULL
;
1609 tg_pt_gp_mem
->tg_pt_gp_assoc
= 0;
1610 tg_pt_gp
->tg_pt_gp_members
--;
1611 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
1614 ssize_t
core_alua_show_tg_pt_gp_info(struct se_port
*port
, char *page
)
1616 struct se_subsystem_dev
*su_dev
= port
->sep_lun
->lun_se_dev
->se_sub_dev
;
1617 struct config_item
*tg_pt_ci
;
1618 struct t10_alua
*alua
= &su_dev
->t10_alua
;
1619 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
1620 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
1623 if (alua
->alua_type
!= SPC3_ALUA_EMULATED
)
1626 tg_pt_gp_mem
= port
->sep_alua_tg_pt_gp_mem
;
1630 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1631 tg_pt_gp
= tg_pt_gp_mem
->tg_pt_gp
;
1633 tg_pt_ci
= &tg_pt_gp
->tg_pt_gp_group
.cg_item
;
1634 len
+= sprintf(page
, "TG Port Alias: %s\nTG Port Group ID:"
1635 " %hu\nTG Port Primary Access State: %s\nTG Port "
1636 "Primary Access Status: %s\nTG Port Secondary Access"
1637 " State: %s\nTG Port Secondary Access Status: %s\n",
1638 config_item_name(tg_pt_ci
), tg_pt_gp
->tg_pt_gp_id
,
1639 core_alua_dump_state(atomic_read(
1640 &tg_pt_gp
->tg_pt_gp_alua_access_state
)),
1641 core_alua_dump_status(
1642 tg_pt_gp
->tg_pt_gp_alua_access_status
),
1643 (atomic_read(&port
->sep_tg_pt_secondary_offline
)) ?
1645 core_alua_dump_status(port
->sep_tg_pt_secondary_stat
));
1647 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1652 ssize_t
core_alua_store_tg_pt_gp_info(
1653 struct se_port
*port
,
1657 struct se_portal_group
*tpg
;
1659 struct se_subsystem_dev
*su_dev
= port
->sep_lun
->lun_se_dev
->se_sub_dev
;
1660 struct t10_alua_tg_pt_gp
*tg_pt_gp
= NULL
, *tg_pt_gp_new
= NULL
;
1661 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
1662 unsigned char buf
[TG_PT_GROUP_NAME_BUF
];
1665 tpg
= port
->sep_tpg
;
1666 lun
= port
->sep_lun
;
1668 if (su_dev
->t10_alua
.alua_type
!= SPC3_ALUA_EMULATED
) {
1669 pr_warn("SPC3_ALUA_EMULATED not enabled for"
1670 " %s/tpgt_%hu/%s\n", tpg
->se_tpg_tfo
->tpg_get_wwn(tpg
),
1671 tpg
->se_tpg_tfo
->tpg_get_tag(tpg
),
1672 config_item_name(&lun
->lun_group
.cg_item
));
1676 if (count
> TG_PT_GROUP_NAME_BUF
) {
1677 pr_err("ALUA Target Port Group alias too large!\n");
1680 memset(buf
, 0, TG_PT_GROUP_NAME_BUF
);
1681 memcpy(buf
, page
, count
);
1683 * Any ALUA target port group alias besides "NULL" means we will be
1684 * making a new group association.
1686 if (strcmp(strstrip(buf
), "NULL")) {
1688 * core_alua_get_tg_pt_gp_by_name() will increment reference to
1689 * struct t10_alua_tg_pt_gp. This reference is released with
1690 * core_alua_put_tg_pt_gp_from_name() below.
1692 tg_pt_gp_new
= core_alua_get_tg_pt_gp_by_name(su_dev
,
1697 tg_pt_gp_mem
= port
->sep_alua_tg_pt_gp_mem
;
1698 if (!tg_pt_gp_mem
) {
1700 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new
);
1701 pr_err("NULL struct se_port->sep_alua_tg_pt_gp_mem pointer\n");
1705 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1706 tg_pt_gp
= tg_pt_gp_mem
->tg_pt_gp
;
1709 * Clearing an existing tg_pt_gp association, and replacing
1710 * with the default_tg_pt_gp.
1712 if (!tg_pt_gp_new
) {
1713 pr_debug("Target_Core_ConfigFS: Moving"
1714 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
1715 " alua/%s, ID: %hu back to"
1716 " default_tg_pt_gp\n",
1717 tpg
->se_tpg_tfo
->tpg_get_wwn(tpg
),
1718 tpg
->se_tpg_tfo
->tpg_get_tag(tpg
),
1719 config_item_name(&lun
->lun_group
.cg_item
),
1721 &tg_pt_gp
->tg_pt_gp_group
.cg_item
),
1722 tg_pt_gp
->tg_pt_gp_id
);
1724 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem
, tg_pt_gp
);
1725 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem
,
1726 su_dev
->t10_alua
.default_tg_pt_gp
);
1727 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1732 * Removing existing association of tg_pt_gp_mem with tg_pt_gp
1734 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem
, tg_pt_gp
);
1738 * Associate tg_pt_gp_mem with tg_pt_gp_new.
1740 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem
, tg_pt_gp_new
);
1741 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1742 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
1743 " Target Port Group: alua/%s, ID: %hu\n", (move
) ?
1744 "Moving" : "Adding", tpg
->se_tpg_tfo
->tpg_get_wwn(tpg
),
1745 tpg
->se_tpg_tfo
->tpg_get_tag(tpg
),
1746 config_item_name(&lun
->lun_group
.cg_item
),
1747 config_item_name(&tg_pt_gp_new
->tg_pt_gp_group
.cg_item
),
1748 tg_pt_gp_new
->tg_pt_gp_id
);
1750 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new
);
1754 ssize_t
core_alua_show_access_type(
1755 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1758 if ((tg_pt_gp
->tg_pt_gp_alua_access_type
& TPGS_EXPLICT_ALUA
) &&
1759 (tg_pt_gp
->tg_pt_gp_alua_access_type
& TPGS_IMPLICT_ALUA
))
1760 return sprintf(page
, "Implict and Explict\n");
1761 else if (tg_pt_gp
->tg_pt_gp_alua_access_type
& TPGS_IMPLICT_ALUA
)
1762 return sprintf(page
, "Implict\n");
1763 else if (tg_pt_gp
->tg_pt_gp_alua_access_type
& TPGS_EXPLICT_ALUA
)
1764 return sprintf(page
, "Explict\n");
1766 return sprintf(page
, "None\n");
1769 ssize_t
core_alua_store_access_type(
1770 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1777 ret
= strict_strtoul(page
, 0, &tmp
);
1779 pr_err("Unable to extract alua_access_type\n");
1782 if ((tmp
!= 0) && (tmp
!= 1) && (tmp
!= 2) && (tmp
!= 3)) {
1783 pr_err("Illegal value for alua_access_type:"
1788 tg_pt_gp
->tg_pt_gp_alua_access_type
=
1789 TPGS_IMPLICT_ALUA
| TPGS_EXPLICT_ALUA
;
1791 tg_pt_gp
->tg_pt_gp_alua_access_type
= TPGS_EXPLICT_ALUA
;
1793 tg_pt_gp
->tg_pt_gp_alua_access_type
= TPGS_IMPLICT_ALUA
;
1795 tg_pt_gp
->tg_pt_gp_alua_access_type
= 0;
1800 ssize_t
core_alua_show_nonop_delay_msecs(
1801 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1804 return sprintf(page
, "%d\n", tg_pt_gp
->tg_pt_gp_nonop_delay_msecs
);
1807 ssize_t
core_alua_store_nonop_delay_msecs(
1808 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1815 ret
= strict_strtoul(page
, 0, &tmp
);
1817 pr_err("Unable to extract nonop_delay_msecs\n");
1820 if (tmp
> ALUA_MAX_NONOP_DELAY_MSECS
) {
1821 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
1822 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp
,
1823 ALUA_MAX_NONOP_DELAY_MSECS
);
1826 tg_pt_gp
->tg_pt_gp_nonop_delay_msecs
= (int)tmp
;
1831 ssize_t
core_alua_show_trans_delay_msecs(
1832 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1835 return sprintf(page
, "%d\n", tg_pt_gp
->tg_pt_gp_trans_delay_msecs
);
1838 ssize_t
core_alua_store_trans_delay_msecs(
1839 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1846 ret
= strict_strtoul(page
, 0, &tmp
);
1848 pr_err("Unable to extract trans_delay_msecs\n");
1851 if (tmp
> ALUA_MAX_TRANS_DELAY_MSECS
) {
1852 pr_err("Passed trans_delay_msecs: %lu, exceeds"
1853 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp
,
1854 ALUA_MAX_TRANS_DELAY_MSECS
);
1857 tg_pt_gp
->tg_pt_gp_trans_delay_msecs
= (int)tmp
;
1862 ssize_t
core_alua_show_preferred_bit(
1863 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1866 return sprintf(page
, "%d\n", tg_pt_gp
->tg_pt_gp_pref
);
1869 ssize_t
core_alua_store_preferred_bit(
1870 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1877 ret
= strict_strtoul(page
, 0, &tmp
);
1879 pr_err("Unable to extract preferred ALUA value\n");
1882 if ((tmp
!= 0) && (tmp
!= 1)) {
1883 pr_err("Illegal value for preferred ALUA: %lu\n", tmp
);
1886 tg_pt_gp
->tg_pt_gp_pref
= (int)tmp
;
1891 ssize_t
core_alua_show_offline_bit(struct se_lun
*lun
, char *page
)
1896 return sprintf(page
, "%d\n",
1897 atomic_read(&lun
->lun_sep
->sep_tg_pt_secondary_offline
));
1900 ssize_t
core_alua_store_offline_bit(
1905 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
1912 ret
= strict_strtoul(page
, 0, &tmp
);
1914 pr_err("Unable to extract alua_tg_pt_offline value\n");
1917 if ((tmp
!= 0) && (tmp
!= 1)) {
1918 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
1922 tg_pt_gp_mem
= lun
->lun_sep
->sep_alua_tg_pt_gp_mem
;
1923 if (!tg_pt_gp_mem
) {
1924 pr_err("Unable to locate *tg_pt_gp_mem\n");
1928 ret
= core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem
,
1929 lun
->lun_sep
, 0, (int)tmp
);
1936 ssize_t
core_alua_show_secondary_status(
1940 return sprintf(page
, "%d\n", lun
->lun_sep
->sep_tg_pt_secondary_stat
);
1943 ssize_t
core_alua_store_secondary_status(
1951 ret
= strict_strtoul(page
, 0, &tmp
);
1953 pr_err("Unable to extract alua_tg_pt_status\n");
1956 if ((tmp
!= ALUA_STATUS_NONE
) &&
1957 (tmp
!= ALUA_STATUS_ALTERED_BY_EXPLICT_STPG
) &&
1958 (tmp
!= ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA
)) {
1959 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
1963 lun
->lun_sep
->sep_tg_pt_secondary_stat
= (int)tmp
;
1968 ssize_t
core_alua_show_secondary_write_metadata(
1972 return sprintf(page
, "%d\n",
1973 lun
->lun_sep
->sep_tg_pt_secondary_write_md
);
1976 ssize_t
core_alua_store_secondary_write_metadata(
1984 ret
= strict_strtoul(page
, 0, &tmp
);
1986 pr_err("Unable to extract alua_tg_pt_write_md\n");
1989 if ((tmp
!= 0) && (tmp
!= 1)) {
1990 pr_err("Illegal value for alua_tg_pt_write_md:"
1994 lun
->lun_sep
->sep_tg_pt_secondary_write_md
= (int)tmp
;
1999 int core_setup_alua(struct se_device
*dev
, int force_pt
)
2001 struct se_subsystem_dev
*su_dev
= dev
->se_sub_dev
;
2002 struct t10_alua
*alua
= &su_dev
->t10_alua
;
2003 struct t10_alua_lu_gp_member
*lu_gp_mem
;
2005 * If this device is from Target_Core_Mod/pSCSI, use the ALUA logic
2006 * of the Underlying SCSI hardware. In Linux/SCSI terms, this can
2007 * cause a problem because libata and some SATA RAID HBAs appear
2008 * under Linux/SCSI, but emulate SCSI logic themselves.
2010 if (((dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
) &&
2011 !(dev
->se_sub_dev
->se_dev_attrib
.emulate_alua
)) || force_pt
) {
2012 alua
->alua_type
= SPC_ALUA_PASSTHROUGH
;
2013 alua
->alua_state_check
= &core_alua_state_check_nop
;
2014 pr_debug("%s: Using SPC_ALUA_PASSTHROUGH, no ALUA"
2015 " emulation\n", dev
->transport
->name
);
2019 * If SPC-3 or above is reported by real or emulated struct se_device,
2020 * use emulated ALUA.
2022 if (dev
->transport
->get_device_rev(dev
) >= SCSI_3
) {
2023 pr_debug("%s: Enabling ALUA Emulation for SPC-3"
2024 " device\n", dev
->transport
->name
);
2026 * Associate this struct se_device with the default ALUA
2029 lu_gp_mem
= core_alua_allocate_lu_gp_mem(dev
);
2030 if (IS_ERR(lu_gp_mem
))
2031 return PTR_ERR(lu_gp_mem
);
2033 alua
->alua_type
= SPC3_ALUA_EMULATED
;
2034 alua
->alua_state_check
= &core_alua_state_check
;
2035 spin_lock(&lu_gp_mem
->lu_gp_mem_lock
);
2036 __core_alua_attach_lu_gp_mem(lu_gp_mem
,
2038 spin_unlock(&lu_gp_mem
->lu_gp_mem_lock
);
2040 pr_debug("%s: Adding to default ALUA LU Group:"
2041 " core/alua/lu_gps/default_lu_gp\n",
2042 dev
->transport
->name
);
2044 alua
->alua_type
= SPC2_ALUA_DISABLED
;
2045 alua
->alua_state_check
= &core_alua_state_check_nop
;
2046 pr_debug("%s: Disabling ALUA Emulation for SPC-2"
2047 " device\n", dev
->transport
->name
);