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 <scsi/scsi.h>
31 #include <scsi/scsi_cmnd.h>
33 #include <target/target_core_base.h>
34 #include <target/target_core_device.h>
35 #include <target/target_core_transport.h>
36 #include <target/target_core_fabric_ops.h>
37 #include <target/target_core_configfs.h>
39 #include "target_core_alua.h"
40 #include "target_core_hba.h"
41 #include "target_core_ua.h"
43 static int core_alua_check_transition(int state
, int *primary
);
44 static int core_alua_set_tg_pt_secondary_state(
45 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
,
46 struct se_port
*port
, int explict
, int offline
);
48 static u16 alua_lu_gps_counter
;
49 static u32 alua_lu_gps_count
;
51 static DEFINE_SPINLOCK(lu_gps_lock
);
52 static LIST_HEAD(lu_gps_list
);
54 struct t10_alua_lu_gp
*default_lu_gp
;
57 * REPORT_TARGET_PORT_GROUPS
59 * See spc4r17 section 6.27
61 int target_emulate_report_target_port_groups(struct se_task
*task
)
63 struct se_cmd
*cmd
= task
->task_se_cmd
;
64 struct se_subsystem_dev
*su_dev
= cmd
->se_dev
->se_sub_dev
;
66 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
67 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
69 u32 rd_len
= 0, off
= 4; /* Skip over RESERVED area to first
70 Target port group descriptor */
72 * Need at least 4 bytes of response data or else we can't
73 * even fit the return data length.
75 if (cmd
->data_length
< 4) {
76 pr_warn("REPORT TARGET PORT GROUPS allocation length %u"
77 " too small\n", cmd
->data_length
);
81 buf
= transport_kmap_first_data_page(cmd
);
83 spin_lock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
84 list_for_each_entry(tg_pt_gp
, &su_dev
->t10_alua
.tg_pt_gps_list
,
87 * Check if the Target port group and Target port descriptor list
88 * based on tg_pt_gp_members count will fit into the response payload.
89 * Otherwise, bump rd_len to let the initiator know we have exceeded
90 * the allocation length and the response is truncated.
92 if ((off
+ 8 + (tg_pt_gp
->tg_pt_gp_members
* 4)) >
94 rd_len
+= 8 + (tg_pt_gp
->tg_pt_gp_members
* 4);
98 * PREF: Preferred target port bit, determine if this
99 * bit should be set for port group.
101 if (tg_pt_gp
->tg_pt_gp_pref
)
104 * Set the ASYMMETRIC ACCESS State
106 buf
[off
++] |= (atomic_read(
107 &tg_pt_gp
->tg_pt_gp_alua_access_state
) & 0xff);
109 * Set supported ASYMMETRIC ACCESS State bits
111 buf
[off
] = 0x80; /* T_SUP */
112 buf
[off
] |= 0x40; /* O_SUP */
113 buf
[off
] |= 0x8; /* U_SUP */
114 buf
[off
] |= 0x4; /* S_SUP */
115 buf
[off
] |= 0x2; /* AN_SUP */
116 buf
[off
++] |= 0x1; /* AO_SUP */
120 buf
[off
++] = ((tg_pt_gp
->tg_pt_gp_id
>> 8) & 0xff);
121 buf
[off
++] = (tg_pt_gp
->tg_pt_gp_id
& 0xff);
123 off
++; /* Skip over Reserved */
127 buf
[off
++] = (tg_pt_gp
->tg_pt_gp_alua_access_status
& 0xff);
129 * Vendor Specific field
135 buf
[off
++] = (tg_pt_gp
->tg_pt_gp_members
& 0xff);
138 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
139 list_for_each_entry(tg_pt_gp_mem
, &tg_pt_gp
->tg_pt_gp_mem_list
,
141 port
= tg_pt_gp_mem
->tg_pt
;
143 * Start Target Port descriptor format
145 * See spc4r17 section 6.2.7 Table 247
147 off
+= 2; /* Skip over Obsolete */
149 * Set RELATIVE TARGET PORT IDENTIFIER
151 buf
[off
++] = ((port
->sep_rtpi
>> 8) & 0xff);
152 buf
[off
++] = (port
->sep_rtpi
& 0xff);
155 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
157 spin_unlock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
159 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
161 buf
[0] = ((rd_len
>> 24) & 0xff);
162 buf
[1] = ((rd_len
>> 16) & 0xff);
163 buf
[2] = ((rd_len
>> 8) & 0xff);
164 buf
[3] = (rd_len
& 0xff);
166 transport_kunmap_first_data_page(cmd
);
172 * SET_TARGET_PORT_GROUPS for explict ALUA operation.
174 * See spc4r17 section 6.35
176 int target_emulate_set_target_port_groups(struct se_task
*task
)
178 struct se_cmd
*cmd
= task
->task_se_cmd
;
179 struct se_device
*dev
= cmd
->se_dev
;
180 struct se_subsystem_dev
*su_dev
= dev
->se_sub_dev
;
181 struct se_port
*port
, *l_port
= cmd
->se_lun
->lun_sep
;
182 struct se_node_acl
*nacl
= cmd
->se_sess
->se_node_acl
;
183 struct t10_alua_tg_pt_gp
*tg_pt_gp
= NULL
, *l_tg_pt_gp
;
184 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
, *l_tg_pt_gp_mem
;
187 u32 len
= 4; /* Skip over RESERVED area in header */
188 int alua_access_state
, primary
= 0, rc
;
192 return PYX_TRANSPORT_LU_COMM_FAILURE
;
194 buf
= transport_kmap_first_data_page(cmd
);
197 * Determine if explict ALUA via SET_TARGET_PORT_GROUPS is allowed
198 * for the local tg_pt_gp.
200 l_tg_pt_gp_mem
= l_port
->sep_alua_tg_pt_gp_mem
;
201 if (!l_tg_pt_gp_mem
) {
202 pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n");
203 rc
= PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
;
206 spin_lock(&l_tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
207 l_tg_pt_gp
= l_tg_pt_gp_mem
->tg_pt_gp
;
209 spin_unlock(&l_tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
210 pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n");
211 rc
= PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
;
214 rc
= (l_tg_pt_gp
->tg_pt_gp_alua_access_type
& TPGS_EXPLICT_ALUA
);
215 spin_unlock(&l_tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
218 pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
219 " while TPGS_EXPLICT_ALUA is disabled\n");
220 rc
= PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
;
224 ptr
= &buf
[4]; /* Skip over RESERVED area in header */
226 while (len
< cmd
->data_length
) {
227 alua_access_state
= (ptr
[0] & 0x0f);
229 * Check the received ALUA access state, and determine if
230 * the state is a primary or secondary target port asymmetric
233 rc
= core_alua_check_transition(alua_access_state
, &primary
);
236 * If the SET TARGET PORT GROUPS attempts to establish
237 * an invalid combination of target port asymmetric
238 * access states or attempts to establish an
239 * unsupported target port asymmetric access state,
240 * then the command shall be terminated with CHECK
241 * CONDITION status, with the sense key set to ILLEGAL
242 * REQUEST, and the additional sense code set to INVALID
243 * FIELD IN PARAMETER LIST.
245 rc
= PYX_TRANSPORT_INVALID_PARAMETER_LIST
;
250 * If the ASYMMETRIC ACCESS STATE field (see table 267)
251 * specifies a primary target port asymmetric access state,
252 * then the TARGET PORT GROUP OR TARGET PORT field specifies
253 * a primary target port group for which the primary target
254 * port asymmetric access state shall be changed. If the
255 * ASYMMETRIC ACCESS STATE field specifies a secondary target
256 * port asymmetric access state, then the TARGET PORT GROUP OR
257 * TARGET PORT field specifies the relative target port
258 * identifier (see 3.1.120) of the target port for which the
259 * secondary target port asymmetric access state shall be
263 tg_pt_id
= ((ptr
[2] << 8) & 0xff);
264 tg_pt_id
|= (ptr
[3] & 0xff);
266 * Locate the matching target port group ID from
267 * the global tg_pt_gp list
269 spin_lock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
270 list_for_each_entry(tg_pt_gp
,
271 &su_dev
->t10_alua
.tg_pt_gps_list
,
273 if (!tg_pt_gp
->tg_pt_gp_valid_id
)
276 if (tg_pt_id
!= tg_pt_gp
->tg_pt_gp_id
)
279 atomic_inc(&tg_pt_gp
->tg_pt_gp_ref_cnt
);
280 smp_mb__after_atomic_inc();
281 spin_unlock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
283 rc
= core_alua_do_port_transition(tg_pt_gp
,
285 alua_access_state
, 1);
287 spin_lock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
288 atomic_dec(&tg_pt_gp
->tg_pt_gp_ref_cnt
);
289 smp_mb__after_atomic_dec();
292 spin_unlock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
294 * If not matching target port group ID can be located
295 * throw an exception with ASCQ: INVALID_PARAMETER_LIST
298 rc
= PYX_TRANSPORT_INVALID_PARAMETER_LIST
;
303 * Extact the RELATIVE TARGET PORT IDENTIFIER to identify
304 * the Target Port in question for the the incoming
305 * SET_TARGET_PORT_GROUPS op.
307 rtpi
= ((ptr
[2] << 8) & 0xff);
308 rtpi
|= (ptr
[3] & 0xff);
310 * Locate the matching relative target port identifer
311 * for the struct se_device storage object.
313 spin_lock(&dev
->se_port_lock
);
314 list_for_each_entry(port
, &dev
->dev_sep_list
,
316 if (port
->sep_rtpi
!= rtpi
)
319 tg_pt_gp_mem
= port
->sep_alua_tg_pt_gp_mem
;
320 spin_unlock(&dev
->se_port_lock
);
322 rc
= core_alua_set_tg_pt_secondary_state(
323 tg_pt_gp_mem
, port
, 1, 1);
325 spin_lock(&dev
->se_port_lock
);
328 spin_unlock(&dev
->se_port_lock
);
330 * If not matching relative target port identifier can
331 * be located, throw an exception with ASCQ:
332 * INVALID_PARAMETER_LIST
335 rc
= PYX_TRANSPORT_INVALID_PARAMETER_LIST
;
345 transport_kunmap_first_data_page(cmd
);
350 static inline int core_alua_state_nonoptimized(
353 int nonop_delay_msecs
,
357 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
358 * later to determine if processing of this cmd needs to be
359 * temporarily delayed for the Active/NonOptimized primary access state.
361 cmd
->se_cmd_flags
|= SCF_ALUA_NON_OPTIMIZED
;
362 cmd
->alua_nonop_delay
= nonop_delay_msecs
;
366 static inline int core_alua_state_standby(
372 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
373 * spc4r17 section 5.9.2.4.4
382 case RECEIVE_DIAGNOSTIC
:
383 case SEND_DIAGNOSTIC
:
386 case MI_REPORT_TARGET_PGS
:
389 *alua_ascq
= ASCQ_04H_ALUA_TG_PT_STANDBY
;
392 case MAINTENANCE_OUT
:
394 case MO_SET_TARGET_PGS
:
397 *alua_ascq
= ASCQ_04H_ALUA_TG_PT_STANDBY
;
401 case PERSISTENT_RESERVE_IN
:
402 case PERSISTENT_RESERVE_OUT
:
407 *alua_ascq
= ASCQ_04H_ALUA_TG_PT_STANDBY
;
414 static inline int core_alua_state_unavailable(
420 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
421 * spc4r17 section 5.9.2.4.5
428 case MI_REPORT_TARGET_PGS
:
431 *alua_ascq
= ASCQ_04H_ALUA_TG_PT_UNAVAILABLE
;
434 case MAINTENANCE_OUT
:
436 case MO_SET_TARGET_PGS
:
439 *alua_ascq
= ASCQ_04H_ALUA_TG_PT_UNAVAILABLE
;
447 *alua_ascq
= ASCQ_04H_ALUA_TG_PT_UNAVAILABLE
;
454 static inline int core_alua_state_transition(
460 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITIO as defined by
461 * spc4r17 section 5.9.2.5
468 case MI_REPORT_TARGET_PGS
:
471 *alua_ascq
= ASCQ_04H_ALUA_STATE_TRANSITION
;
479 *alua_ascq
= ASCQ_04H_ALUA_STATE_TRANSITION
;
487 * Used for alua_type SPC_ALUA_PASSTHROUGH and SPC2_ALUA_DISABLED
488 * in transport_cmd_sequencer(). This function is assigned to
489 * struct t10_alua *->state_check() in core_setup_alua()
491 static int core_alua_state_check_nop(
500 * Used for alua_type SPC3_ALUA_EMULATED in transport_cmd_sequencer().
501 * This function is assigned to struct t10_alua *->state_check() in
504 * Also, this function can return three different return codes to
505 * signal transport_generic_cmd_sequencer()
507 * return 1: Is used to signal LUN not accecsable, and check condition/not ready
508 * return 0: Used to signal success
509 * reutrn -1: Used to signal failure, and invalid cdb field
511 static int core_alua_state_check(
516 struct se_lun
*lun
= cmd
->se_lun
;
517 struct se_port
*port
= lun
->lun_sep
;
518 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
519 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
520 int out_alua_state
, nonop_delay_msecs
;
525 * First, check for a struct se_port specific secondary ALUA target port
526 * access state: OFFLINE
528 if (atomic_read(&port
->sep_tg_pt_secondary_offline
)) {
529 *alua_ascq
= ASCQ_04H_ALUA_OFFLINE
;
530 pr_debug("ALUA: Got secondary offline status for local"
532 *alua_ascq
= ASCQ_04H_ALUA_OFFLINE
;
536 * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the
537 * ALUA target port group, to obtain current ALUA access state.
538 * Otherwise look for the underlying struct se_device association with
539 * a ALUA logical unit group.
541 tg_pt_gp_mem
= port
->sep_alua_tg_pt_gp_mem
;
542 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
543 tg_pt_gp
= tg_pt_gp_mem
->tg_pt_gp
;
544 out_alua_state
= atomic_read(&tg_pt_gp
->tg_pt_gp_alua_access_state
);
545 nonop_delay_msecs
= tg_pt_gp
->tg_pt_gp_nonop_delay_msecs
;
546 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
548 * Process ALUA_ACCESS_STATE_ACTIVE_OPTMIZED in a separate conditional
549 * statement so the compiler knows explicitly to check this case first.
550 * For the Optimized ALUA access state case, we want to process the
551 * incoming fabric cmd ASAP..
553 if (out_alua_state
== ALUA_ACCESS_STATE_ACTIVE_OPTMIZED
)
556 switch (out_alua_state
) {
557 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED
:
558 return core_alua_state_nonoptimized(cmd
, cdb
,
559 nonop_delay_msecs
, alua_ascq
);
560 case ALUA_ACCESS_STATE_STANDBY
:
561 return core_alua_state_standby(cmd
, cdb
, alua_ascq
);
562 case ALUA_ACCESS_STATE_UNAVAILABLE
:
563 return core_alua_state_unavailable(cmd
, cdb
, alua_ascq
);
564 case ALUA_ACCESS_STATE_TRANSITION
:
565 return core_alua_state_transition(cmd
, cdb
, alua_ascq
);
567 * OFFLINE is a secondary ALUA target port group access state, that is
568 * handled above with struct se_port->sep_tg_pt_secondary_offline=1
570 case ALUA_ACCESS_STATE_OFFLINE
:
572 pr_err("Unknown ALUA access state: 0x%02x\n",
581 * Check implict and explict ALUA state change request.
583 static int core_alua_check_transition(int state
, int *primary
)
586 case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED
:
587 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED
:
588 case ALUA_ACCESS_STATE_STANDBY
:
589 case ALUA_ACCESS_STATE_UNAVAILABLE
:
591 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
592 * defined as primary target port asymmetric access states.
596 case ALUA_ACCESS_STATE_OFFLINE
:
598 * OFFLINE state is defined as a secondary target port
599 * asymmetric access state.
604 pr_err("Unknown ALUA access state: 0x%02x\n", state
);
611 static char *core_alua_dump_state(int state
)
614 case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED
:
615 return "Active/Optimized";
616 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED
:
617 return "Active/NonOptimized";
618 case ALUA_ACCESS_STATE_STANDBY
:
620 case ALUA_ACCESS_STATE_UNAVAILABLE
:
621 return "Unavailable";
622 case ALUA_ACCESS_STATE_OFFLINE
:
631 char *core_alua_dump_status(int status
)
634 case ALUA_STATUS_NONE
:
636 case ALUA_STATUS_ALTERED_BY_EXPLICT_STPG
:
637 return "Altered by Explict STPG";
638 case ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA
:
639 return "Altered by Implict ALUA";
648 * Used by fabric modules to determine when we need to delay processing
649 * for the Active/NonOptimized paths..
651 int core_alua_check_nonop_delay(
654 if (!(cmd
->se_cmd_flags
& SCF_ALUA_NON_OPTIMIZED
))
659 * The ALUA Active/NonOptimized access state delay can be disabled
660 * in via configfs with a value of zero
662 if (!cmd
->alua_nonop_delay
)
665 * struct se_cmd->alua_nonop_delay gets set by a target port group
666 * defined interval in core_alua_state_nonoptimized()
668 msleep_interruptible(cmd
->alua_nonop_delay
);
671 EXPORT_SYMBOL(core_alua_check_nonop_delay
);
674 * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex
677 static int core_alua_write_tpg_metadata(
679 unsigned char *md_buf
,
685 int flags
= O_RDWR
| O_CREAT
| O_TRUNC
, ret
;
687 memset(iov
, 0, sizeof(struct iovec
));
689 file
= filp_open(path
, flags
, 0600);
690 if (IS_ERR(file
) || !file
|| !file
->f_dentry
) {
691 pr_err("filp_open(%s) for ALUA metadata failed\n",
696 iov
[0].iov_base
= &md_buf
[0];
697 iov
[0].iov_len
= md_buf_len
;
701 ret
= vfs_writev(file
, &iov
[0], 1, &file
->f_pos
);
705 pr_err("Error writing ALUA metadata file: %s\n", path
);
706 filp_close(file
, NULL
);
709 filp_close(file
, NULL
);
715 * Called with tg_pt_gp->tg_pt_gp_md_mutex held
717 static int core_alua_update_tpg_primary_metadata(
718 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
720 unsigned char *md_buf
)
722 struct se_subsystem_dev
*su_dev
= tg_pt_gp
->tg_pt_gp_su_dev
;
723 struct t10_wwn
*wwn
= &su_dev
->t10_wwn
;
724 char path
[ALUA_METADATA_PATH_LEN
];
727 memset(path
, 0, ALUA_METADATA_PATH_LEN
);
729 len
= snprintf(md_buf
, tg_pt_gp
->tg_pt_gp_md_buf_len
,
731 "alua_access_state=0x%02x\n"
732 "alua_access_status=0x%02x\n",
733 tg_pt_gp
->tg_pt_gp_id
, primary_state
,
734 tg_pt_gp
->tg_pt_gp_alua_access_status
);
736 snprintf(path
, ALUA_METADATA_PATH_LEN
,
737 "/var/target/alua/tpgs_%s/%s", &wwn
->unit_serial
[0],
738 config_item_name(&tg_pt_gp
->tg_pt_gp_group
.cg_item
));
740 return core_alua_write_tpg_metadata(path
, md_buf
, len
);
743 static int core_alua_do_transition_tg_pt(
744 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
745 struct se_port
*l_port
,
746 struct se_node_acl
*nacl
,
747 unsigned char *md_buf
,
751 struct se_dev_entry
*se_deve
;
752 struct se_lun_acl
*lacl
;
753 struct se_port
*port
;
754 struct t10_alua_tg_pt_gp_member
*mem
;
757 * Save the old primary ALUA access state, and set the current state
758 * to ALUA_ACCESS_STATE_TRANSITION.
760 old_state
= atomic_read(&tg_pt_gp
->tg_pt_gp_alua_access_state
);
761 atomic_set(&tg_pt_gp
->tg_pt_gp_alua_access_state
,
762 ALUA_ACCESS_STATE_TRANSITION
);
763 tg_pt_gp
->tg_pt_gp_alua_access_status
= (explict
) ?
764 ALUA_STATUS_ALTERED_BY_EXPLICT_STPG
:
765 ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA
;
767 * Check for the optional ALUA primary state transition delay
769 if (tg_pt_gp
->tg_pt_gp_trans_delay_msecs
!= 0)
770 msleep_interruptible(tg_pt_gp
->tg_pt_gp_trans_delay_msecs
);
772 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
773 list_for_each_entry(mem
, &tg_pt_gp
->tg_pt_gp_mem_list
,
777 * After an implicit target port asymmetric access state
778 * change, a device server shall establish a unit attention
779 * condition for the initiator port associated with every I_T
780 * nexus with the additional sense code set to ASYMMETRIC
781 * ACCESS STATE CHAGED.
783 * After an explicit target port asymmetric access state
784 * change, a device server shall establish a unit attention
785 * condition with the additional sense code set to ASYMMETRIC
786 * ACCESS STATE CHANGED for the initiator port associated with
787 * every I_T nexus other than the I_T nexus on which the SET
788 * TARGET PORT GROUPS command
790 atomic_inc(&mem
->tg_pt_gp_mem_ref_cnt
);
791 smp_mb__after_atomic_inc();
792 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
794 spin_lock_bh(&port
->sep_alua_lock
);
795 list_for_each_entry(se_deve
, &port
->sep_alua_list
,
797 lacl
= se_deve
->se_lun_acl
;
799 * se_deve->se_lun_acl pointer may be NULL for a
800 * entry created without explict Node+MappedLUN ACLs
806 (nacl
!= NULL
) && (nacl
== lacl
->se_lun_nacl
) &&
807 (l_port
!= NULL
) && (l_port
== port
))
810 core_scsi3_ua_allocate(lacl
->se_lun_nacl
,
811 se_deve
->mapped_lun
, 0x2A,
812 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED
);
814 spin_unlock_bh(&port
->sep_alua_lock
);
816 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
817 atomic_dec(&mem
->tg_pt_gp_mem_ref_cnt
);
818 smp_mb__after_atomic_dec();
820 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
822 * Update the ALUA metadata buf that has been allocated in
823 * core_alua_do_port_transition(), this metadata will be written
826 * Note that there is the case where we do not want to update the
827 * metadata when the saved metadata is being parsed in userspace
828 * when setting the existing port access state and access status.
830 * Also note that the failure to write out the ALUA metadata to
831 * struct file does NOT affect the actual ALUA transition.
833 if (tg_pt_gp
->tg_pt_gp_write_metadata
) {
834 mutex_lock(&tg_pt_gp
->tg_pt_gp_md_mutex
);
835 core_alua_update_tpg_primary_metadata(tg_pt_gp
,
837 mutex_unlock(&tg_pt_gp
->tg_pt_gp_md_mutex
);
840 * Set the current primary ALUA access state to the requested new state
842 atomic_set(&tg_pt_gp
->tg_pt_gp_alua_access_state
, new_state
);
844 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
845 " from primary access state %s to %s\n", (explict
) ? "explict" :
846 "implict", config_item_name(&tg_pt_gp
->tg_pt_gp_group
.cg_item
),
847 tg_pt_gp
->tg_pt_gp_id
, core_alua_dump_state(old_state
),
848 core_alua_dump_state(new_state
));
853 int core_alua_do_port_transition(
854 struct t10_alua_tg_pt_gp
*l_tg_pt_gp
,
855 struct se_device
*l_dev
,
856 struct se_port
*l_port
,
857 struct se_node_acl
*l_nacl
,
861 struct se_device
*dev
;
862 struct se_port
*port
;
863 struct se_subsystem_dev
*su_dev
;
864 struct se_node_acl
*nacl
;
865 struct t10_alua_lu_gp
*lu_gp
;
866 struct t10_alua_lu_gp_member
*lu_gp_mem
, *local_lu_gp_mem
;
867 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
868 unsigned char *md_buf
;
871 if (core_alua_check_transition(new_state
, &primary
) != 0)
874 md_buf
= kzalloc(l_tg_pt_gp
->tg_pt_gp_md_buf_len
, GFP_KERNEL
);
876 pr_err("Unable to allocate buf for ALUA metadata\n");
880 local_lu_gp_mem
= l_dev
->dev_alua_lu_gp_mem
;
881 spin_lock(&local_lu_gp_mem
->lu_gp_mem_lock
);
882 lu_gp
= local_lu_gp_mem
->lu_gp
;
883 atomic_inc(&lu_gp
->lu_gp_ref_cnt
);
884 smp_mb__after_atomic_inc();
885 spin_unlock(&local_lu_gp_mem
->lu_gp_mem_lock
);
887 * For storage objects that are members of the 'default_lu_gp',
888 * we only do transition on the passed *l_tp_pt_gp, and not
889 * on all of the matching target port groups IDs in default_lu_gp.
891 if (!lu_gp
->lu_gp_id
) {
893 * core_alua_do_transition_tg_pt() will always return
896 core_alua_do_transition_tg_pt(l_tg_pt_gp
, l_port
, l_nacl
,
897 md_buf
, new_state
, explict
);
898 atomic_dec(&lu_gp
->lu_gp_ref_cnt
);
899 smp_mb__after_atomic_dec();
904 * For all other LU groups aside from 'default_lu_gp', walk all of
905 * the associated storage objects looking for a matching target port
906 * group ID from the local target port group.
908 spin_lock(&lu_gp
->lu_gp_lock
);
909 list_for_each_entry(lu_gp_mem
, &lu_gp
->lu_gp_mem_list
,
912 dev
= lu_gp_mem
->lu_gp_mem_dev
;
913 su_dev
= dev
->se_sub_dev
;
914 atomic_inc(&lu_gp_mem
->lu_gp_mem_ref_cnt
);
915 smp_mb__after_atomic_inc();
916 spin_unlock(&lu_gp
->lu_gp_lock
);
918 spin_lock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
919 list_for_each_entry(tg_pt_gp
,
920 &su_dev
->t10_alua
.tg_pt_gps_list
,
923 if (!tg_pt_gp
->tg_pt_gp_valid_id
)
926 * If the target behavior port asymmetric access state
927 * is changed for any target port group accessiable via
928 * a logical unit within a LU group, the target port
929 * behavior group asymmetric access states for the same
930 * target port group accessible via other logical units
931 * in that LU group will also change.
933 if (l_tg_pt_gp
->tg_pt_gp_id
!= tg_pt_gp
->tg_pt_gp_id
)
936 if (l_tg_pt_gp
== tg_pt_gp
) {
943 atomic_inc(&tg_pt_gp
->tg_pt_gp_ref_cnt
);
944 smp_mb__after_atomic_inc();
945 spin_unlock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
947 * core_alua_do_transition_tg_pt() will always return
950 core_alua_do_transition_tg_pt(tg_pt_gp
, port
,
951 nacl
, md_buf
, new_state
, explict
);
953 spin_lock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
954 atomic_dec(&tg_pt_gp
->tg_pt_gp_ref_cnt
);
955 smp_mb__after_atomic_dec();
957 spin_unlock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
959 spin_lock(&lu_gp
->lu_gp_lock
);
960 atomic_dec(&lu_gp_mem
->lu_gp_mem_ref_cnt
);
961 smp_mb__after_atomic_dec();
963 spin_unlock(&lu_gp
->lu_gp_lock
);
965 pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
966 " Group IDs: %hu %s transition to primary state: %s\n",
967 config_item_name(&lu_gp
->lu_gp_group
.cg_item
),
968 l_tg_pt_gp
->tg_pt_gp_id
, (explict
) ? "explict" : "implict",
969 core_alua_dump_state(new_state
));
971 atomic_dec(&lu_gp
->lu_gp_ref_cnt
);
972 smp_mb__after_atomic_dec();
978 * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held
980 static int core_alua_update_tpg_secondary_metadata(
981 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
,
982 struct se_port
*port
,
983 unsigned char *md_buf
,
986 struct se_portal_group
*se_tpg
= port
->sep_tpg
;
987 char path
[ALUA_METADATA_PATH_LEN
], wwn
[ALUA_SECONDARY_METADATA_WWN_LEN
];
990 memset(path
, 0, ALUA_METADATA_PATH_LEN
);
991 memset(wwn
, 0, ALUA_SECONDARY_METADATA_WWN_LEN
);
993 len
= snprintf(wwn
, ALUA_SECONDARY_METADATA_WWN_LEN
, "%s",
994 se_tpg
->se_tpg_tfo
->tpg_get_wwn(se_tpg
));
996 if (se_tpg
->se_tpg_tfo
->tpg_get_tag
!= NULL
)
997 snprintf(wwn
+len
, ALUA_SECONDARY_METADATA_WWN_LEN
-len
, "+%hu",
998 se_tpg
->se_tpg_tfo
->tpg_get_tag(se_tpg
));
1000 len
= snprintf(md_buf
, md_buf_len
, "alua_tg_pt_offline=%d\n"
1001 "alua_tg_pt_status=0x%02x\n",
1002 atomic_read(&port
->sep_tg_pt_secondary_offline
),
1003 port
->sep_tg_pt_secondary_stat
);
1005 snprintf(path
, ALUA_METADATA_PATH_LEN
, "/var/target/alua/%s/%s/lun_%u",
1006 se_tpg
->se_tpg_tfo
->get_fabric_name(), wwn
,
1007 port
->sep_lun
->unpacked_lun
);
1009 return core_alua_write_tpg_metadata(path
, md_buf
, len
);
1012 static int core_alua_set_tg_pt_secondary_state(
1013 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
,
1014 struct se_port
*port
,
1018 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
1019 unsigned char *md_buf
;
1021 int trans_delay_msecs
;
1023 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1024 tg_pt_gp
= tg_pt_gp_mem
->tg_pt_gp
;
1026 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1027 pr_err("Unable to complete secondary state"
1031 trans_delay_msecs
= tg_pt_gp
->tg_pt_gp_trans_delay_msecs
;
1033 * Set the secondary ALUA target port access state to OFFLINE
1034 * or release the previously secondary state for struct se_port
1037 atomic_set(&port
->sep_tg_pt_secondary_offline
, 1);
1039 atomic_set(&port
->sep_tg_pt_secondary_offline
, 0);
1041 md_buf_len
= tg_pt_gp
->tg_pt_gp_md_buf_len
;
1042 port
->sep_tg_pt_secondary_stat
= (explict
) ?
1043 ALUA_STATUS_ALTERED_BY_EXPLICT_STPG
:
1044 ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA
;
1046 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1047 " to secondary access state: %s\n", (explict
) ? "explict" :
1048 "implict", config_item_name(&tg_pt_gp
->tg_pt_gp_group
.cg_item
),
1049 tg_pt_gp
->tg_pt_gp_id
, (offline
) ? "OFFLINE" : "ONLINE");
1051 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1053 * Do the optional transition delay after we set the secondary
1054 * ALUA access state.
1056 if (trans_delay_msecs
!= 0)
1057 msleep_interruptible(trans_delay_msecs
);
1059 * See if we need to update the ALUA fabric port metadata for
1060 * secondary state and status
1062 if (port
->sep_tg_pt_secondary_write_md
) {
1063 md_buf
= kzalloc(md_buf_len
, GFP_KERNEL
);
1065 pr_err("Unable to allocate md_buf for"
1066 " secondary ALUA access metadata\n");
1069 mutex_lock(&port
->sep_tg_pt_md_mutex
);
1070 core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem
, port
,
1071 md_buf
, md_buf_len
);
1072 mutex_unlock(&port
->sep_tg_pt_md_mutex
);
1080 struct t10_alua_lu_gp
*
1081 core_alua_allocate_lu_gp(const char *name
, int def_group
)
1083 struct t10_alua_lu_gp
*lu_gp
;
1085 lu_gp
= kmem_cache_zalloc(t10_alua_lu_gp_cache
, GFP_KERNEL
);
1087 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1088 return ERR_PTR(-ENOMEM
);
1090 INIT_LIST_HEAD(&lu_gp
->lu_gp_node
);
1091 INIT_LIST_HEAD(&lu_gp
->lu_gp_mem_list
);
1092 spin_lock_init(&lu_gp
->lu_gp_lock
);
1093 atomic_set(&lu_gp
->lu_gp_ref_cnt
, 0);
1096 lu_gp
->lu_gp_id
= alua_lu_gps_counter
++;
1097 lu_gp
->lu_gp_valid_id
= 1;
1098 alua_lu_gps_count
++;
1104 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp
*lu_gp
, u16 lu_gp_id
)
1106 struct t10_alua_lu_gp
*lu_gp_tmp
;
1109 * The lu_gp->lu_gp_id may only be set once..
1111 if (lu_gp
->lu_gp_valid_id
) {
1112 pr_warn("ALUA LU Group already has a valid ID,"
1113 " ignoring request\n");
1117 spin_lock(&lu_gps_lock
);
1118 if (alua_lu_gps_count
== 0x0000ffff) {
1119 pr_err("Maximum ALUA alua_lu_gps_count:"
1120 " 0x0000ffff reached\n");
1121 spin_unlock(&lu_gps_lock
);
1122 kmem_cache_free(t10_alua_lu_gp_cache
, lu_gp
);
1126 lu_gp_id_tmp
= (lu_gp_id
!= 0) ? lu_gp_id
:
1127 alua_lu_gps_counter
++;
1129 list_for_each_entry(lu_gp_tmp
, &lu_gps_list
, lu_gp_node
) {
1130 if (lu_gp_tmp
->lu_gp_id
== lu_gp_id_tmp
) {
1134 pr_warn("ALUA Logical Unit Group ID: %hu"
1135 " already exists, ignoring request\n",
1137 spin_unlock(&lu_gps_lock
);
1142 lu_gp
->lu_gp_id
= lu_gp_id_tmp
;
1143 lu_gp
->lu_gp_valid_id
= 1;
1144 list_add_tail(&lu_gp
->lu_gp_node
, &lu_gps_list
);
1145 alua_lu_gps_count
++;
1146 spin_unlock(&lu_gps_lock
);
1151 static struct t10_alua_lu_gp_member
*
1152 core_alua_allocate_lu_gp_mem(struct se_device
*dev
)
1154 struct t10_alua_lu_gp_member
*lu_gp_mem
;
1156 lu_gp_mem
= kmem_cache_zalloc(t10_alua_lu_gp_mem_cache
, GFP_KERNEL
);
1158 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1159 return ERR_PTR(-ENOMEM
);
1161 INIT_LIST_HEAD(&lu_gp_mem
->lu_gp_mem_list
);
1162 spin_lock_init(&lu_gp_mem
->lu_gp_mem_lock
);
1163 atomic_set(&lu_gp_mem
->lu_gp_mem_ref_cnt
, 0);
1165 lu_gp_mem
->lu_gp_mem_dev
= dev
;
1166 dev
->dev_alua_lu_gp_mem
= lu_gp_mem
;
1171 void core_alua_free_lu_gp(struct t10_alua_lu_gp
*lu_gp
)
1173 struct t10_alua_lu_gp_member
*lu_gp_mem
, *lu_gp_mem_tmp
;
1175 * Once we have reached this point, config_item_put() has
1176 * already been called from target_core_alua_drop_lu_gp().
1178 * Here, we remove the *lu_gp from the global list so that
1179 * no associations can be made while we are releasing
1180 * struct t10_alua_lu_gp.
1182 spin_lock(&lu_gps_lock
);
1183 atomic_set(&lu_gp
->lu_gp_shutdown
, 1);
1184 list_del(&lu_gp
->lu_gp_node
);
1185 alua_lu_gps_count
--;
1186 spin_unlock(&lu_gps_lock
);
1188 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1189 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1190 * released with core_alua_put_lu_gp_from_name()
1192 while (atomic_read(&lu_gp
->lu_gp_ref_cnt
))
1195 * Release reference to struct t10_alua_lu_gp * from all associated
1198 spin_lock(&lu_gp
->lu_gp_lock
);
1199 list_for_each_entry_safe(lu_gp_mem
, lu_gp_mem_tmp
,
1200 &lu_gp
->lu_gp_mem_list
, lu_gp_mem_list
) {
1201 if (lu_gp_mem
->lu_gp_assoc
) {
1202 list_del(&lu_gp_mem
->lu_gp_mem_list
);
1203 lu_gp
->lu_gp_members
--;
1204 lu_gp_mem
->lu_gp_assoc
= 0;
1206 spin_unlock(&lu_gp
->lu_gp_lock
);
1209 * lu_gp_mem is associated with a single
1210 * struct se_device->dev_alua_lu_gp_mem, and is released when
1211 * struct se_device is released via core_alua_free_lu_gp_mem().
1213 * If the passed lu_gp does NOT match the default_lu_gp, assume
1214 * we want to re-assocate a given lu_gp_mem with default_lu_gp.
1216 spin_lock(&lu_gp_mem
->lu_gp_mem_lock
);
1217 if (lu_gp
!= default_lu_gp
)
1218 __core_alua_attach_lu_gp_mem(lu_gp_mem
,
1221 lu_gp_mem
->lu_gp
= NULL
;
1222 spin_unlock(&lu_gp_mem
->lu_gp_mem_lock
);
1224 spin_lock(&lu_gp
->lu_gp_lock
);
1226 spin_unlock(&lu_gp
->lu_gp_lock
);
1228 kmem_cache_free(t10_alua_lu_gp_cache
, lu_gp
);
1231 void core_alua_free_lu_gp_mem(struct se_device
*dev
)
1233 struct se_subsystem_dev
*su_dev
= dev
->se_sub_dev
;
1234 struct t10_alua
*alua
= &su_dev
->t10_alua
;
1235 struct t10_alua_lu_gp
*lu_gp
;
1236 struct t10_alua_lu_gp_member
*lu_gp_mem
;
1238 if (alua
->alua_type
!= SPC3_ALUA_EMULATED
)
1241 lu_gp_mem
= dev
->dev_alua_lu_gp_mem
;
1245 while (atomic_read(&lu_gp_mem
->lu_gp_mem_ref_cnt
))
1248 spin_lock(&lu_gp_mem
->lu_gp_mem_lock
);
1249 lu_gp
= lu_gp_mem
->lu_gp
;
1251 spin_lock(&lu_gp
->lu_gp_lock
);
1252 if (lu_gp_mem
->lu_gp_assoc
) {
1253 list_del(&lu_gp_mem
->lu_gp_mem_list
);
1254 lu_gp
->lu_gp_members
--;
1255 lu_gp_mem
->lu_gp_assoc
= 0;
1257 spin_unlock(&lu_gp
->lu_gp_lock
);
1258 lu_gp_mem
->lu_gp
= NULL
;
1260 spin_unlock(&lu_gp_mem
->lu_gp_mem_lock
);
1262 kmem_cache_free(t10_alua_lu_gp_mem_cache
, lu_gp_mem
);
1265 struct t10_alua_lu_gp
*core_alua_get_lu_gp_by_name(const char *name
)
1267 struct t10_alua_lu_gp
*lu_gp
;
1268 struct config_item
*ci
;
1270 spin_lock(&lu_gps_lock
);
1271 list_for_each_entry(lu_gp
, &lu_gps_list
, lu_gp_node
) {
1272 if (!lu_gp
->lu_gp_valid_id
)
1274 ci
= &lu_gp
->lu_gp_group
.cg_item
;
1275 if (!strcmp(config_item_name(ci
), name
)) {
1276 atomic_inc(&lu_gp
->lu_gp_ref_cnt
);
1277 spin_unlock(&lu_gps_lock
);
1281 spin_unlock(&lu_gps_lock
);
1286 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp
*lu_gp
)
1288 spin_lock(&lu_gps_lock
);
1289 atomic_dec(&lu_gp
->lu_gp_ref_cnt
);
1290 spin_unlock(&lu_gps_lock
);
1294 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1296 void __core_alua_attach_lu_gp_mem(
1297 struct t10_alua_lu_gp_member
*lu_gp_mem
,
1298 struct t10_alua_lu_gp
*lu_gp
)
1300 spin_lock(&lu_gp
->lu_gp_lock
);
1301 lu_gp_mem
->lu_gp
= lu_gp
;
1302 lu_gp_mem
->lu_gp_assoc
= 1;
1303 list_add_tail(&lu_gp_mem
->lu_gp_mem_list
, &lu_gp
->lu_gp_mem_list
);
1304 lu_gp
->lu_gp_members
++;
1305 spin_unlock(&lu_gp
->lu_gp_lock
);
1309 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1311 void __core_alua_drop_lu_gp_mem(
1312 struct t10_alua_lu_gp_member
*lu_gp_mem
,
1313 struct t10_alua_lu_gp
*lu_gp
)
1315 spin_lock(&lu_gp
->lu_gp_lock
);
1316 list_del(&lu_gp_mem
->lu_gp_mem_list
);
1317 lu_gp_mem
->lu_gp
= NULL
;
1318 lu_gp_mem
->lu_gp_assoc
= 0;
1319 lu_gp
->lu_gp_members
--;
1320 spin_unlock(&lu_gp
->lu_gp_lock
);
1323 struct t10_alua_tg_pt_gp
*core_alua_allocate_tg_pt_gp(
1324 struct se_subsystem_dev
*su_dev
,
1328 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
1330 tg_pt_gp
= kmem_cache_zalloc(t10_alua_tg_pt_gp_cache
, GFP_KERNEL
);
1332 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1335 INIT_LIST_HEAD(&tg_pt_gp
->tg_pt_gp_list
);
1336 INIT_LIST_HEAD(&tg_pt_gp
->tg_pt_gp_mem_list
);
1337 mutex_init(&tg_pt_gp
->tg_pt_gp_md_mutex
);
1338 spin_lock_init(&tg_pt_gp
->tg_pt_gp_lock
);
1339 atomic_set(&tg_pt_gp
->tg_pt_gp_ref_cnt
, 0);
1340 tg_pt_gp
->tg_pt_gp_su_dev
= su_dev
;
1341 tg_pt_gp
->tg_pt_gp_md_buf_len
= ALUA_MD_BUF_LEN
;
1342 atomic_set(&tg_pt_gp
->tg_pt_gp_alua_access_state
,
1343 ALUA_ACCESS_STATE_ACTIVE_OPTMIZED
);
1345 * Enable both explict and implict ALUA support by default
1347 tg_pt_gp
->tg_pt_gp_alua_access_type
=
1348 TPGS_EXPLICT_ALUA
| TPGS_IMPLICT_ALUA
;
1350 * Set the default Active/NonOptimized Delay in milliseconds
1352 tg_pt_gp
->tg_pt_gp_nonop_delay_msecs
= ALUA_DEFAULT_NONOP_DELAY_MSECS
;
1353 tg_pt_gp
->tg_pt_gp_trans_delay_msecs
= ALUA_DEFAULT_TRANS_DELAY_MSECS
;
1356 spin_lock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
1357 tg_pt_gp
->tg_pt_gp_id
=
1358 su_dev
->t10_alua
.alua_tg_pt_gps_counter
++;
1359 tg_pt_gp
->tg_pt_gp_valid_id
= 1;
1360 su_dev
->t10_alua
.alua_tg_pt_gps_count
++;
1361 list_add_tail(&tg_pt_gp
->tg_pt_gp_list
,
1362 &su_dev
->t10_alua
.tg_pt_gps_list
);
1363 spin_unlock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
1369 int core_alua_set_tg_pt_gp_id(
1370 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1373 struct se_subsystem_dev
*su_dev
= tg_pt_gp
->tg_pt_gp_su_dev
;
1374 struct t10_alua_tg_pt_gp
*tg_pt_gp_tmp
;
1375 u16 tg_pt_gp_id_tmp
;
1377 * The tg_pt_gp->tg_pt_gp_id may only be set once..
1379 if (tg_pt_gp
->tg_pt_gp_valid_id
) {
1380 pr_warn("ALUA TG PT Group already has a valid ID,"
1381 " ignoring request\n");
1385 spin_lock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
1386 if (su_dev
->t10_alua
.alua_tg_pt_gps_count
== 0x0000ffff) {
1387 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1388 " 0x0000ffff reached\n");
1389 spin_unlock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
1390 kmem_cache_free(t10_alua_tg_pt_gp_cache
, tg_pt_gp
);
1394 tg_pt_gp_id_tmp
= (tg_pt_gp_id
!= 0) ? tg_pt_gp_id
:
1395 su_dev
->t10_alua
.alua_tg_pt_gps_counter
++;
1397 list_for_each_entry(tg_pt_gp_tmp
, &su_dev
->t10_alua
.tg_pt_gps_list
,
1399 if (tg_pt_gp_tmp
->tg_pt_gp_id
== tg_pt_gp_id_tmp
) {
1403 pr_err("ALUA Target Port Group ID: %hu already"
1404 " exists, ignoring request\n", tg_pt_gp_id
);
1405 spin_unlock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
1410 tg_pt_gp
->tg_pt_gp_id
= tg_pt_gp_id_tmp
;
1411 tg_pt_gp
->tg_pt_gp_valid_id
= 1;
1412 list_add_tail(&tg_pt_gp
->tg_pt_gp_list
,
1413 &su_dev
->t10_alua
.tg_pt_gps_list
);
1414 su_dev
->t10_alua
.alua_tg_pt_gps_count
++;
1415 spin_unlock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
1420 struct t10_alua_tg_pt_gp_member
*core_alua_allocate_tg_pt_gp_mem(
1421 struct se_port
*port
)
1423 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
1425 tg_pt_gp_mem
= kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache
,
1427 if (!tg_pt_gp_mem
) {
1428 pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n");
1429 return ERR_PTR(-ENOMEM
);
1431 INIT_LIST_HEAD(&tg_pt_gp_mem
->tg_pt_gp_mem_list
);
1432 spin_lock_init(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1433 atomic_set(&tg_pt_gp_mem
->tg_pt_gp_mem_ref_cnt
, 0);
1435 tg_pt_gp_mem
->tg_pt
= port
;
1436 port
->sep_alua_tg_pt_gp_mem
= tg_pt_gp_mem
;
1437 atomic_set(&port
->sep_tg_pt_gp_active
, 1);
1439 return tg_pt_gp_mem
;
1442 void core_alua_free_tg_pt_gp(
1443 struct t10_alua_tg_pt_gp
*tg_pt_gp
)
1445 struct se_subsystem_dev
*su_dev
= tg_pt_gp
->tg_pt_gp_su_dev
;
1446 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
, *tg_pt_gp_mem_tmp
;
1448 * Once we have reached this point, config_item_put() has already
1449 * been called from target_core_alua_drop_tg_pt_gp().
1451 * Here we remove *tg_pt_gp from the global list so that
1452 * no assications *OR* explict ALUA via SET_TARGET_PORT_GROUPS
1453 * can be made while we are releasing struct t10_alua_tg_pt_gp.
1455 spin_lock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
1456 list_del(&tg_pt_gp
->tg_pt_gp_list
);
1457 su_dev
->t10_alua
.alua_tg_pt_gps_counter
--;
1458 spin_unlock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
1460 * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1461 * core_alua_get_tg_pt_gp_by_name() in
1462 * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1463 * to be released with core_alua_put_tg_pt_gp_from_name().
1465 while (atomic_read(&tg_pt_gp
->tg_pt_gp_ref_cnt
))
1468 * Release reference to struct t10_alua_tg_pt_gp from all associated
1471 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
1472 list_for_each_entry_safe(tg_pt_gp_mem
, tg_pt_gp_mem_tmp
,
1473 &tg_pt_gp
->tg_pt_gp_mem_list
, tg_pt_gp_mem_list
) {
1474 if (tg_pt_gp_mem
->tg_pt_gp_assoc
) {
1475 list_del(&tg_pt_gp_mem
->tg_pt_gp_mem_list
);
1476 tg_pt_gp
->tg_pt_gp_members
--;
1477 tg_pt_gp_mem
->tg_pt_gp_assoc
= 0;
1479 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
1481 * tg_pt_gp_mem is associated with a single
1482 * se_port->sep_alua_tg_pt_gp_mem, and is released via
1483 * core_alua_free_tg_pt_gp_mem().
1485 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1486 * assume we want to re-assocate a given tg_pt_gp_mem with
1489 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1490 if (tg_pt_gp
!= su_dev
->t10_alua
.default_tg_pt_gp
) {
1491 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem
,
1492 su_dev
->t10_alua
.default_tg_pt_gp
);
1494 tg_pt_gp_mem
->tg_pt_gp
= NULL
;
1495 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1497 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
1499 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
1501 kmem_cache_free(t10_alua_tg_pt_gp_cache
, tg_pt_gp
);
1504 void core_alua_free_tg_pt_gp_mem(struct se_port
*port
)
1506 struct se_subsystem_dev
*su_dev
= port
->sep_lun
->lun_se_dev
->se_sub_dev
;
1507 struct t10_alua
*alua
= &su_dev
->t10_alua
;
1508 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
1509 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
1511 if (alua
->alua_type
!= SPC3_ALUA_EMULATED
)
1514 tg_pt_gp_mem
= port
->sep_alua_tg_pt_gp_mem
;
1518 while (atomic_read(&tg_pt_gp_mem
->tg_pt_gp_mem_ref_cnt
))
1521 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1522 tg_pt_gp
= tg_pt_gp_mem
->tg_pt_gp
;
1524 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
1525 if (tg_pt_gp_mem
->tg_pt_gp_assoc
) {
1526 list_del(&tg_pt_gp_mem
->tg_pt_gp_mem_list
);
1527 tg_pt_gp
->tg_pt_gp_members
--;
1528 tg_pt_gp_mem
->tg_pt_gp_assoc
= 0;
1530 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
1531 tg_pt_gp_mem
->tg_pt_gp
= NULL
;
1533 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1535 kmem_cache_free(t10_alua_tg_pt_gp_mem_cache
, tg_pt_gp_mem
);
1538 static struct t10_alua_tg_pt_gp
*core_alua_get_tg_pt_gp_by_name(
1539 struct se_subsystem_dev
*su_dev
,
1542 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
1543 struct config_item
*ci
;
1545 spin_lock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
1546 list_for_each_entry(tg_pt_gp
, &su_dev
->t10_alua
.tg_pt_gps_list
,
1548 if (!tg_pt_gp
->tg_pt_gp_valid_id
)
1550 ci
= &tg_pt_gp
->tg_pt_gp_group
.cg_item
;
1551 if (!strcmp(config_item_name(ci
), name
)) {
1552 atomic_inc(&tg_pt_gp
->tg_pt_gp_ref_cnt
);
1553 spin_unlock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
1557 spin_unlock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
1562 static void core_alua_put_tg_pt_gp_from_name(
1563 struct t10_alua_tg_pt_gp
*tg_pt_gp
)
1565 struct se_subsystem_dev
*su_dev
= tg_pt_gp
->tg_pt_gp_su_dev
;
1567 spin_lock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
1568 atomic_dec(&tg_pt_gp
->tg_pt_gp_ref_cnt
);
1569 spin_unlock(&su_dev
->t10_alua
.tg_pt_gps_lock
);
1573 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1575 void __core_alua_attach_tg_pt_gp_mem(
1576 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
,
1577 struct t10_alua_tg_pt_gp
*tg_pt_gp
)
1579 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
1580 tg_pt_gp_mem
->tg_pt_gp
= tg_pt_gp
;
1581 tg_pt_gp_mem
->tg_pt_gp_assoc
= 1;
1582 list_add_tail(&tg_pt_gp_mem
->tg_pt_gp_mem_list
,
1583 &tg_pt_gp
->tg_pt_gp_mem_list
);
1584 tg_pt_gp
->tg_pt_gp_members
++;
1585 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
1589 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1591 static void __core_alua_drop_tg_pt_gp_mem(
1592 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
,
1593 struct t10_alua_tg_pt_gp
*tg_pt_gp
)
1595 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
1596 list_del(&tg_pt_gp_mem
->tg_pt_gp_mem_list
);
1597 tg_pt_gp_mem
->tg_pt_gp
= NULL
;
1598 tg_pt_gp_mem
->tg_pt_gp_assoc
= 0;
1599 tg_pt_gp
->tg_pt_gp_members
--;
1600 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
1603 ssize_t
core_alua_show_tg_pt_gp_info(struct se_port
*port
, char *page
)
1605 struct se_subsystem_dev
*su_dev
= port
->sep_lun
->lun_se_dev
->se_sub_dev
;
1606 struct config_item
*tg_pt_ci
;
1607 struct t10_alua
*alua
= &su_dev
->t10_alua
;
1608 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
1609 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
1612 if (alua
->alua_type
!= SPC3_ALUA_EMULATED
)
1615 tg_pt_gp_mem
= port
->sep_alua_tg_pt_gp_mem
;
1619 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1620 tg_pt_gp
= tg_pt_gp_mem
->tg_pt_gp
;
1622 tg_pt_ci
= &tg_pt_gp
->tg_pt_gp_group
.cg_item
;
1623 len
+= sprintf(page
, "TG Port Alias: %s\nTG Port Group ID:"
1624 " %hu\nTG Port Primary Access State: %s\nTG Port "
1625 "Primary Access Status: %s\nTG Port Secondary Access"
1626 " State: %s\nTG Port Secondary Access Status: %s\n",
1627 config_item_name(tg_pt_ci
), tg_pt_gp
->tg_pt_gp_id
,
1628 core_alua_dump_state(atomic_read(
1629 &tg_pt_gp
->tg_pt_gp_alua_access_state
)),
1630 core_alua_dump_status(
1631 tg_pt_gp
->tg_pt_gp_alua_access_status
),
1632 (atomic_read(&port
->sep_tg_pt_secondary_offline
)) ?
1634 core_alua_dump_status(port
->sep_tg_pt_secondary_stat
));
1636 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1641 ssize_t
core_alua_store_tg_pt_gp_info(
1642 struct se_port
*port
,
1646 struct se_portal_group
*tpg
;
1648 struct se_subsystem_dev
*su_dev
= port
->sep_lun
->lun_se_dev
->se_sub_dev
;
1649 struct t10_alua_tg_pt_gp
*tg_pt_gp
= NULL
, *tg_pt_gp_new
= NULL
;
1650 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
1651 unsigned char buf
[TG_PT_GROUP_NAME_BUF
];
1654 tpg
= port
->sep_tpg
;
1655 lun
= port
->sep_lun
;
1657 if (su_dev
->t10_alua
.alua_type
!= SPC3_ALUA_EMULATED
) {
1658 pr_warn("SPC3_ALUA_EMULATED not enabled for"
1659 " %s/tpgt_%hu/%s\n", tpg
->se_tpg_tfo
->tpg_get_wwn(tpg
),
1660 tpg
->se_tpg_tfo
->tpg_get_tag(tpg
),
1661 config_item_name(&lun
->lun_group
.cg_item
));
1665 if (count
> TG_PT_GROUP_NAME_BUF
) {
1666 pr_err("ALUA Target Port Group alias too large!\n");
1669 memset(buf
, 0, TG_PT_GROUP_NAME_BUF
);
1670 memcpy(buf
, page
, count
);
1672 * Any ALUA target port group alias besides "NULL" means we will be
1673 * making a new group association.
1675 if (strcmp(strstrip(buf
), "NULL")) {
1677 * core_alua_get_tg_pt_gp_by_name() will increment reference to
1678 * struct t10_alua_tg_pt_gp. This reference is released with
1679 * core_alua_put_tg_pt_gp_from_name() below.
1681 tg_pt_gp_new
= core_alua_get_tg_pt_gp_by_name(su_dev
,
1686 tg_pt_gp_mem
= port
->sep_alua_tg_pt_gp_mem
;
1687 if (!tg_pt_gp_mem
) {
1689 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new
);
1690 pr_err("NULL struct se_port->sep_alua_tg_pt_gp_mem pointer\n");
1694 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1695 tg_pt_gp
= tg_pt_gp_mem
->tg_pt_gp
;
1698 * Clearing an existing tg_pt_gp association, and replacing
1699 * with the default_tg_pt_gp.
1701 if (!tg_pt_gp_new
) {
1702 pr_debug("Target_Core_ConfigFS: Moving"
1703 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
1704 " alua/%s, ID: %hu back to"
1705 " default_tg_pt_gp\n",
1706 tpg
->se_tpg_tfo
->tpg_get_wwn(tpg
),
1707 tpg
->se_tpg_tfo
->tpg_get_tag(tpg
),
1708 config_item_name(&lun
->lun_group
.cg_item
),
1710 &tg_pt_gp
->tg_pt_gp_group
.cg_item
),
1711 tg_pt_gp
->tg_pt_gp_id
);
1713 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem
, tg_pt_gp
);
1714 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem
,
1715 su_dev
->t10_alua
.default_tg_pt_gp
);
1716 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1721 * Removing existing association of tg_pt_gp_mem with tg_pt_gp
1723 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem
, tg_pt_gp
);
1727 * Associate tg_pt_gp_mem with tg_pt_gp_new.
1729 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem
, tg_pt_gp_new
);
1730 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1731 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
1732 " Target Port Group: alua/%s, ID: %hu\n", (move
) ?
1733 "Moving" : "Adding", tpg
->se_tpg_tfo
->tpg_get_wwn(tpg
),
1734 tpg
->se_tpg_tfo
->tpg_get_tag(tpg
),
1735 config_item_name(&lun
->lun_group
.cg_item
),
1736 config_item_name(&tg_pt_gp_new
->tg_pt_gp_group
.cg_item
),
1737 tg_pt_gp_new
->tg_pt_gp_id
);
1739 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new
);
1743 ssize_t
core_alua_show_access_type(
1744 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1747 if ((tg_pt_gp
->tg_pt_gp_alua_access_type
& TPGS_EXPLICT_ALUA
) &&
1748 (tg_pt_gp
->tg_pt_gp_alua_access_type
& TPGS_IMPLICT_ALUA
))
1749 return sprintf(page
, "Implict and Explict\n");
1750 else if (tg_pt_gp
->tg_pt_gp_alua_access_type
& TPGS_IMPLICT_ALUA
)
1751 return sprintf(page
, "Implict\n");
1752 else if (tg_pt_gp
->tg_pt_gp_alua_access_type
& TPGS_EXPLICT_ALUA
)
1753 return sprintf(page
, "Explict\n");
1755 return sprintf(page
, "None\n");
1758 ssize_t
core_alua_store_access_type(
1759 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1766 ret
= strict_strtoul(page
, 0, &tmp
);
1768 pr_err("Unable to extract alua_access_type\n");
1771 if ((tmp
!= 0) && (tmp
!= 1) && (tmp
!= 2) && (tmp
!= 3)) {
1772 pr_err("Illegal value for alua_access_type:"
1777 tg_pt_gp
->tg_pt_gp_alua_access_type
=
1778 TPGS_IMPLICT_ALUA
| TPGS_EXPLICT_ALUA
;
1780 tg_pt_gp
->tg_pt_gp_alua_access_type
= TPGS_EXPLICT_ALUA
;
1782 tg_pt_gp
->tg_pt_gp_alua_access_type
= TPGS_IMPLICT_ALUA
;
1784 tg_pt_gp
->tg_pt_gp_alua_access_type
= 0;
1789 ssize_t
core_alua_show_nonop_delay_msecs(
1790 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1793 return sprintf(page
, "%d\n", tg_pt_gp
->tg_pt_gp_nonop_delay_msecs
);
1796 ssize_t
core_alua_store_nonop_delay_msecs(
1797 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1804 ret
= strict_strtoul(page
, 0, &tmp
);
1806 pr_err("Unable to extract nonop_delay_msecs\n");
1809 if (tmp
> ALUA_MAX_NONOP_DELAY_MSECS
) {
1810 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
1811 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp
,
1812 ALUA_MAX_NONOP_DELAY_MSECS
);
1815 tg_pt_gp
->tg_pt_gp_nonop_delay_msecs
= (int)tmp
;
1820 ssize_t
core_alua_show_trans_delay_msecs(
1821 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1824 return sprintf(page
, "%d\n", tg_pt_gp
->tg_pt_gp_trans_delay_msecs
);
1827 ssize_t
core_alua_store_trans_delay_msecs(
1828 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1835 ret
= strict_strtoul(page
, 0, &tmp
);
1837 pr_err("Unable to extract trans_delay_msecs\n");
1840 if (tmp
> ALUA_MAX_TRANS_DELAY_MSECS
) {
1841 pr_err("Passed trans_delay_msecs: %lu, exceeds"
1842 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp
,
1843 ALUA_MAX_TRANS_DELAY_MSECS
);
1846 tg_pt_gp
->tg_pt_gp_trans_delay_msecs
= (int)tmp
;
1851 ssize_t
core_alua_show_preferred_bit(
1852 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1855 return sprintf(page
, "%d\n", tg_pt_gp
->tg_pt_gp_pref
);
1858 ssize_t
core_alua_store_preferred_bit(
1859 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1866 ret
= strict_strtoul(page
, 0, &tmp
);
1868 pr_err("Unable to extract preferred ALUA value\n");
1871 if ((tmp
!= 0) && (tmp
!= 1)) {
1872 pr_err("Illegal value for preferred ALUA: %lu\n", tmp
);
1875 tg_pt_gp
->tg_pt_gp_pref
= (int)tmp
;
1880 ssize_t
core_alua_show_offline_bit(struct se_lun
*lun
, char *page
)
1885 return sprintf(page
, "%d\n",
1886 atomic_read(&lun
->lun_sep
->sep_tg_pt_secondary_offline
));
1889 ssize_t
core_alua_store_offline_bit(
1894 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
1901 ret
= strict_strtoul(page
, 0, &tmp
);
1903 pr_err("Unable to extract alua_tg_pt_offline value\n");
1906 if ((tmp
!= 0) && (tmp
!= 1)) {
1907 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
1911 tg_pt_gp_mem
= lun
->lun_sep
->sep_alua_tg_pt_gp_mem
;
1912 if (!tg_pt_gp_mem
) {
1913 pr_err("Unable to locate *tg_pt_gp_mem\n");
1917 ret
= core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem
,
1918 lun
->lun_sep
, 0, (int)tmp
);
1925 ssize_t
core_alua_show_secondary_status(
1929 return sprintf(page
, "%d\n", lun
->lun_sep
->sep_tg_pt_secondary_stat
);
1932 ssize_t
core_alua_store_secondary_status(
1940 ret
= strict_strtoul(page
, 0, &tmp
);
1942 pr_err("Unable to extract alua_tg_pt_status\n");
1945 if ((tmp
!= ALUA_STATUS_NONE
) &&
1946 (tmp
!= ALUA_STATUS_ALTERED_BY_EXPLICT_STPG
) &&
1947 (tmp
!= ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA
)) {
1948 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
1952 lun
->lun_sep
->sep_tg_pt_secondary_stat
= (int)tmp
;
1957 ssize_t
core_alua_show_secondary_write_metadata(
1961 return sprintf(page
, "%d\n",
1962 lun
->lun_sep
->sep_tg_pt_secondary_write_md
);
1965 ssize_t
core_alua_store_secondary_write_metadata(
1973 ret
= strict_strtoul(page
, 0, &tmp
);
1975 pr_err("Unable to extract alua_tg_pt_write_md\n");
1978 if ((tmp
!= 0) && (tmp
!= 1)) {
1979 pr_err("Illegal value for alua_tg_pt_write_md:"
1983 lun
->lun_sep
->sep_tg_pt_secondary_write_md
= (int)tmp
;
1988 int core_setup_alua(struct se_device
*dev
, int force_pt
)
1990 struct se_subsystem_dev
*su_dev
= dev
->se_sub_dev
;
1991 struct t10_alua
*alua
= &su_dev
->t10_alua
;
1992 struct t10_alua_lu_gp_member
*lu_gp_mem
;
1994 * If this device is from Target_Core_Mod/pSCSI, use the ALUA logic
1995 * of the Underlying SCSI hardware. In Linux/SCSI terms, this can
1996 * cause a problem because libata and some SATA RAID HBAs appear
1997 * under Linux/SCSI, but emulate SCSI logic themselves.
1999 if (((dev
->transport
->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
) &&
2000 !(dev
->se_sub_dev
->se_dev_attrib
.emulate_alua
)) || force_pt
) {
2001 alua
->alua_type
= SPC_ALUA_PASSTHROUGH
;
2002 alua
->alua_state_check
= &core_alua_state_check_nop
;
2003 pr_debug("%s: Using SPC_ALUA_PASSTHROUGH, no ALUA"
2004 " emulation\n", dev
->transport
->name
);
2008 * If SPC-3 or above is reported by real or emulated struct se_device,
2009 * use emulated ALUA.
2011 if (dev
->transport
->get_device_rev(dev
) >= SCSI_3
) {
2012 pr_debug("%s: Enabling ALUA Emulation for SPC-3"
2013 " device\n", dev
->transport
->name
);
2015 * Associate this struct se_device with the default ALUA
2018 lu_gp_mem
= core_alua_allocate_lu_gp_mem(dev
);
2019 if (IS_ERR(lu_gp_mem
))
2020 return PTR_ERR(lu_gp_mem
);
2022 alua
->alua_type
= SPC3_ALUA_EMULATED
;
2023 alua
->alua_state_check
= &core_alua_state_check
;
2024 spin_lock(&lu_gp_mem
->lu_gp_mem_lock
);
2025 __core_alua_attach_lu_gp_mem(lu_gp_mem
,
2027 spin_unlock(&lu_gp_mem
->lu_gp_mem_lock
);
2029 pr_debug("%s: Adding to default ALUA LU Group:"
2030 " core/alua/lu_gps/default_lu_gp\n",
2031 dev
->transport
->name
);
2033 alua
->alua_type
= SPC2_ALUA_DISABLED
;
2034 alua
->alua_state_check
= &core_alua_state_check_nop
;
2035 pr_debug("%s: Disabling ALUA Emulation for SPC-2"
2036 " device\n", dev
->transport
->name
);