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/version.h>
28 #include <linux/slab.h>
29 #include <linux/spinlock.h>
30 #include <linux/configfs.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
);
50 * REPORT_TARGET_PORT_GROUPS
52 * See spc4r17 section 6.27
54 int core_emulate_report_target_port_groups(struct se_cmd
*cmd
)
56 struct se_subsystem_dev
*su_dev
= SE_DEV(cmd
)->se_sub_dev
;
58 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
59 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
60 unsigned char *buf
= (unsigned char *)T_TASK(cmd
)->t_task_buf
;
61 u32 rd_len
= 0, off
= 4; /* Skip over RESERVED area to first
62 Target port group descriptor */
64 * Need at least 4 bytes of response data or else we can't
65 * even fit the return data length.
67 if (cmd
->data_length
< 4) {
68 pr_warn("REPORT TARGET PORT GROUPS allocation length %u"
69 " too small\n", cmd
->data_length
);
73 spin_lock(&T10_ALUA(su_dev
)->tg_pt_gps_lock
);
74 list_for_each_entry(tg_pt_gp
, &T10_ALUA(su_dev
)->tg_pt_gps_list
,
77 * Check if the Target port group and Target port descriptor list
78 * based on tg_pt_gp_members count will fit into the response payload.
79 * Otherwise, bump rd_len to let the initiator know we have exceeded
80 * the allocation length and the response is truncated.
82 if ((off
+ 8 + (tg_pt_gp
->tg_pt_gp_members
* 4)) >
84 rd_len
+= 8 + (tg_pt_gp
->tg_pt_gp_members
* 4);
88 * PREF: Preferred target port bit, determine if this
89 * bit should be set for port group.
91 if (tg_pt_gp
->tg_pt_gp_pref
)
94 * Set the ASYMMETRIC ACCESS State
96 buf
[off
++] |= (atomic_read(
97 &tg_pt_gp
->tg_pt_gp_alua_access_state
) & 0xff);
99 * Set supported ASYMMETRIC ACCESS State bits
101 buf
[off
] = 0x80; /* T_SUP */
102 buf
[off
] |= 0x40; /* O_SUP */
103 buf
[off
] |= 0x8; /* U_SUP */
104 buf
[off
] |= 0x4; /* S_SUP */
105 buf
[off
] |= 0x2; /* AN_SUP */
106 buf
[off
++] |= 0x1; /* AO_SUP */
110 buf
[off
++] = ((tg_pt_gp
->tg_pt_gp_id
>> 8) & 0xff);
111 buf
[off
++] = (tg_pt_gp
->tg_pt_gp_id
& 0xff);
113 off
++; /* Skip over Reserved */
117 buf
[off
++] = (tg_pt_gp
->tg_pt_gp_alua_access_status
& 0xff);
119 * Vendor Specific field
125 buf
[off
++] = (tg_pt_gp
->tg_pt_gp_members
& 0xff);
128 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
129 list_for_each_entry(tg_pt_gp_mem
, &tg_pt_gp
->tg_pt_gp_mem_list
,
131 port
= tg_pt_gp_mem
->tg_pt
;
133 * Start Target Port descriptor format
135 * See spc4r17 section 6.2.7 Table 247
137 off
+= 2; /* Skip over Obsolete */
139 * Set RELATIVE TARGET PORT IDENTIFIER
141 buf
[off
++] = ((port
->sep_rtpi
>> 8) & 0xff);
142 buf
[off
++] = (port
->sep_rtpi
& 0xff);
145 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
147 spin_unlock(&T10_ALUA(su_dev
)->tg_pt_gps_lock
);
149 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
151 buf
[0] = ((rd_len
>> 24) & 0xff);
152 buf
[1] = ((rd_len
>> 16) & 0xff);
153 buf
[2] = ((rd_len
>> 8) & 0xff);
154 buf
[3] = (rd_len
& 0xff);
160 * SET_TARGET_PORT_GROUPS for explict ALUA operation.
162 * See spc4r17 section 6.35
164 int core_emulate_set_target_port_groups(struct se_cmd
*cmd
)
166 struct se_device
*dev
= SE_DEV(cmd
);
167 struct se_subsystem_dev
*su_dev
= SE_DEV(cmd
)->se_sub_dev
;
168 struct se_port
*port
, *l_port
= SE_LUN(cmd
)->lun_sep
;
169 struct se_node_acl
*nacl
= SE_SESS(cmd
)->se_node_acl
;
170 struct t10_alua_tg_pt_gp
*tg_pt_gp
= NULL
, *l_tg_pt_gp
;
171 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
, *l_tg_pt_gp_mem
;
172 unsigned char *buf
= (unsigned char *)T_TASK(cmd
)->t_task_buf
;
173 unsigned char *ptr
= &buf
[4]; /* Skip over RESERVED area in header */
174 u32 len
= 4; /* Skip over RESERVED area in header */
175 int alua_access_state
, primary
= 0, rc
;
179 return PYX_TRANSPORT_LU_COMM_FAILURE
;
181 * Determine if explict ALUA via SET_TARGET_PORT_GROUPS is allowed
182 * for the local tg_pt_gp.
184 l_tg_pt_gp_mem
= l_port
->sep_alua_tg_pt_gp_mem
;
185 if (!(l_tg_pt_gp_mem
)) {
186 printk(KERN_ERR
"Unable to access l_port->sep_alua_tg_pt_gp_mem\n");
187 return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
;
189 spin_lock(&l_tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
190 l_tg_pt_gp
= l_tg_pt_gp_mem
->tg_pt_gp
;
192 spin_unlock(&l_tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
193 printk(KERN_ERR
"Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n");
194 return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
;
196 rc
= (l_tg_pt_gp
->tg_pt_gp_alua_access_type
& TPGS_EXPLICT_ALUA
);
197 spin_unlock(&l_tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
200 printk(KERN_INFO
"Unable to process SET_TARGET_PORT_GROUPS"
201 " while TPGS_EXPLICT_ALUA is disabled\n");
202 return PYX_TRANSPORT_UNKNOWN_SAM_OPCODE
;
205 while (len
< cmd
->data_length
) {
206 alua_access_state
= (ptr
[0] & 0x0f);
208 * Check the received ALUA access state, and determine if
209 * the state is a primary or secondary target port asymmetric
212 rc
= core_alua_check_transition(alua_access_state
, &primary
);
215 * If the SET TARGET PORT GROUPS attempts to establish
216 * an invalid combination of target port asymmetric
217 * access states or attempts to establish an
218 * unsupported target port asymmetric access state,
219 * then the command shall be terminated with CHECK
220 * CONDITION status, with the sense key set to ILLEGAL
221 * REQUEST, and the additional sense code set to INVALID
222 * FIELD IN PARAMETER LIST.
224 return PYX_TRANSPORT_INVALID_PARAMETER_LIST
;
228 * If the ASYMMETRIC ACCESS STATE field (see table 267)
229 * specifies a primary target port asymmetric access state,
230 * then the TARGET PORT GROUP OR TARGET PORT field specifies
231 * a primary target port group for which the primary target
232 * port asymmetric access state shall be changed. If the
233 * ASYMMETRIC ACCESS STATE field specifies a secondary target
234 * port asymmetric access state, then the TARGET PORT GROUP OR
235 * TARGET PORT field specifies the relative target port
236 * identifier (see 3.1.120) of the target port for which the
237 * secondary target port asymmetric access state shall be
241 tg_pt_id
= ((ptr
[2] << 8) & 0xff);
242 tg_pt_id
|= (ptr
[3] & 0xff);
244 * Locate the matching target port group ID from
245 * the global tg_pt_gp list
247 spin_lock(&T10_ALUA(su_dev
)->tg_pt_gps_lock
);
248 list_for_each_entry(tg_pt_gp
,
249 &T10_ALUA(su_dev
)->tg_pt_gps_list
,
251 if (!(tg_pt_gp
->tg_pt_gp_valid_id
))
254 if (tg_pt_id
!= tg_pt_gp
->tg_pt_gp_id
)
257 atomic_inc(&tg_pt_gp
->tg_pt_gp_ref_cnt
);
258 smp_mb__after_atomic_inc();
259 spin_unlock(&T10_ALUA(su_dev
)->tg_pt_gps_lock
);
261 rc
= core_alua_do_port_transition(tg_pt_gp
,
263 alua_access_state
, 1);
265 spin_lock(&T10_ALUA(su_dev
)->tg_pt_gps_lock
);
266 atomic_dec(&tg_pt_gp
->tg_pt_gp_ref_cnt
);
267 smp_mb__after_atomic_dec();
270 spin_unlock(&T10_ALUA(su_dev
)->tg_pt_gps_lock
);
272 * If not matching target port group ID can be located
273 * throw an exception with ASCQ: INVALID_PARAMETER_LIST
276 return PYX_TRANSPORT_INVALID_PARAMETER_LIST
;
279 * Extact the RELATIVE TARGET PORT IDENTIFIER to identify
280 * the Target Port in question for the the incoming
281 * SET_TARGET_PORT_GROUPS op.
283 rtpi
= ((ptr
[2] << 8) & 0xff);
284 rtpi
|= (ptr
[3] & 0xff);
286 * Locate the matching relative target port identifer
287 * for the struct se_device storage object.
289 spin_lock(&dev
->se_port_lock
);
290 list_for_each_entry(port
, &dev
->dev_sep_list
,
292 if (port
->sep_rtpi
!= rtpi
)
295 tg_pt_gp_mem
= port
->sep_alua_tg_pt_gp_mem
;
296 spin_unlock(&dev
->se_port_lock
);
298 rc
= core_alua_set_tg_pt_secondary_state(
299 tg_pt_gp_mem
, port
, 1, 1);
301 spin_lock(&dev
->se_port_lock
);
304 spin_unlock(&dev
->se_port_lock
);
306 * If not matching relative target port identifier can
307 * be located, throw an exception with ASCQ:
308 * INVALID_PARAMETER_LIST
311 return PYX_TRANSPORT_INVALID_PARAMETER_LIST
;
321 static inline int core_alua_state_nonoptimized(
324 int nonop_delay_msecs
,
328 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
329 * later to determine if processing of this cmd needs to be
330 * temporarily delayed for the Active/NonOptimized primary access state.
332 cmd
->se_cmd_flags
|= SCF_ALUA_NON_OPTIMIZED
;
333 cmd
->alua_nonop_delay
= nonop_delay_msecs
;
337 static inline int core_alua_state_standby(
343 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
344 * spc4r17 section 5.9.2.4.4
353 case RECEIVE_DIAGNOSTIC
:
354 case SEND_DIAGNOSTIC
:
357 case MI_REPORT_TARGET_PGS
:
360 *alua_ascq
= ASCQ_04H_ALUA_TG_PT_STANDBY
;
363 case MAINTENANCE_OUT
:
365 case MO_SET_TARGET_PGS
:
368 *alua_ascq
= ASCQ_04H_ALUA_TG_PT_STANDBY
;
372 case PERSISTENT_RESERVE_IN
:
373 case PERSISTENT_RESERVE_OUT
:
378 *alua_ascq
= ASCQ_04H_ALUA_TG_PT_STANDBY
;
385 static inline int core_alua_state_unavailable(
391 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
392 * spc4r17 section 5.9.2.4.5
399 case MI_REPORT_TARGET_PGS
:
402 *alua_ascq
= ASCQ_04H_ALUA_TG_PT_UNAVAILABLE
;
405 case MAINTENANCE_OUT
:
407 case MO_SET_TARGET_PGS
:
410 *alua_ascq
= ASCQ_04H_ALUA_TG_PT_UNAVAILABLE
;
418 *alua_ascq
= ASCQ_04H_ALUA_TG_PT_UNAVAILABLE
;
425 static inline int core_alua_state_transition(
431 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITIO as defined by
432 * spc4r17 section 5.9.2.5
439 case MI_REPORT_TARGET_PGS
:
442 *alua_ascq
= ASCQ_04H_ALUA_STATE_TRANSITION
;
450 *alua_ascq
= ASCQ_04H_ALUA_STATE_TRANSITION
;
458 * Used for alua_type SPC_ALUA_PASSTHROUGH and SPC2_ALUA_DISABLED
459 * in transport_cmd_sequencer(). This function is assigned to
460 * struct t10_alua *->state_check() in core_setup_alua()
462 static int core_alua_state_check_nop(
471 * Used for alua_type SPC3_ALUA_EMULATED in transport_cmd_sequencer().
472 * This function is assigned to struct t10_alua *->state_check() in
475 * Also, this function can return three different return codes to
476 * signal transport_generic_cmd_sequencer()
478 * return 1: Is used to signal LUN not accecsable, and check condition/not ready
479 * return 0: Used to signal success
480 * reutrn -1: Used to signal failure, and invalid cdb field
482 static int core_alua_state_check(
487 struct se_lun
*lun
= SE_LUN(cmd
);
488 struct se_port
*port
= lun
->lun_sep
;
489 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
490 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
491 int out_alua_state
, nonop_delay_msecs
;
496 * First, check for a struct se_port specific secondary ALUA target port
497 * access state: OFFLINE
499 if (atomic_read(&port
->sep_tg_pt_secondary_offline
)) {
500 *alua_ascq
= ASCQ_04H_ALUA_OFFLINE
;
501 printk(KERN_INFO
"ALUA: Got secondary offline status for local"
503 *alua_ascq
= ASCQ_04H_ALUA_OFFLINE
;
507 * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the
508 * ALUA target port group, to obtain current ALUA access state.
509 * Otherwise look for the underlying struct se_device association with
510 * a ALUA logical unit group.
512 tg_pt_gp_mem
= port
->sep_alua_tg_pt_gp_mem
;
513 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
514 tg_pt_gp
= tg_pt_gp_mem
->tg_pt_gp
;
515 out_alua_state
= atomic_read(&tg_pt_gp
->tg_pt_gp_alua_access_state
);
516 nonop_delay_msecs
= tg_pt_gp
->tg_pt_gp_nonop_delay_msecs
;
517 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
519 * Process ALUA_ACCESS_STATE_ACTIVE_OPTMIZED in a separate conditional
520 * statement so the compiler knows explicitly to check this case first.
521 * For the Optimized ALUA access state case, we want to process the
522 * incoming fabric cmd ASAP..
524 if (out_alua_state
== ALUA_ACCESS_STATE_ACTIVE_OPTMIZED
)
527 switch (out_alua_state
) {
528 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED
:
529 return core_alua_state_nonoptimized(cmd
, cdb
,
530 nonop_delay_msecs
, alua_ascq
);
531 case ALUA_ACCESS_STATE_STANDBY
:
532 return core_alua_state_standby(cmd
, cdb
, alua_ascq
);
533 case ALUA_ACCESS_STATE_UNAVAILABLE
:
534 return core_alua_state_unavailable(cmd
, cdb
, alua_ascq
);
535 case ALUA_ACCESS_STATE_TRANSITION
:
536 return core_alua_state_transition(cmd
, cdb
, alua_ascq
);
538 * OFFLINE is a secondary ALUA target port group access state, that is
539 * handled above with struct se_port->sep_tg_pt_secondary_offline=1
541 case ALUA_ACCESS_STATE_OFFLINE
:
543 printk(KERN_ERR
"Unknown ALUA access state: 0x%02x\n",
552 * Check implict and explict ALUA state change request.
554 static int core_alua_check_transition(int state
, int *primary
)
557 case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED
:
558 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED
:
559 case ALUA_ACCESS_STATE_STANDBY
:
560 case ALUA_ACCESS_STATE_UNAVAILABLE
:
562 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
563 * defined as primary target port asymmetric access states.
567 case ALUA_ACCESS_STATE_OFFLINE
:
569 * OFFLINE state is defined as a secondary target port
570 * asymmetric access state.
575 printk(KERN_ERR
"Unknown ALUA access state: 0x%02x\n", state
);
582 static char *core_alua_dump_state(int state
)
585 case ALUA_ACCESS_STATE_ACTIVE_OPTMIZED
:
586 return "Active/Optimized";
587 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED
:
588 return "Active/NonOptimized";
589 case ALUA_ACCESS_STATE_STANDBY
:
591 case ALUA_ACCESS_STATE_UNAVAILABLE
:
592 return "Unavailable";
593 case ALUA_ACCESS_STATE_OFFLINE
:
602 char *core_alua_dump_status(int status
)
605 case ALUA_STATUS_NONE
:
607 case ALUA_STATUS_ALTERED_BY_EXPLICT_STPG
:
608 return "Altered by Explict STPG";
609 case ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA
:
610 return "Altered by Implict ALUA";
619 * Used by fabric modules to determine when we need to delay processing
620 * for the Active/NonOptimized paths..
622 int core_alua_check_nonop_delay(
625 if (!(cmd
->se_cmd_flags
& SCF_ALUA_NON_OPTIMIZED
))
630 * The ALUA Active/NonOptimized access state delay can be disabled
631 * in via configfs with a value of zero
633 if (!(cmd
->alua_nonop_delay
))
636 * struct se_cmd->alua_nonop_delay gets set by a target port group
637 * defined interval in core_alua_state_nonoptimized()
639 msleep_interruptible(cmd
->alua_nonop_delay
);
642 EXPORT_SYMBOL(core_alua_check_nonop_delay
);
645 * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex
648 static int core_alua_write_tpg_metadata(
650 unsigned char *md_buf
,
656 int flags
= O_RDWR
| O_CREAT
| O_TRUNC
, ret
;
658 memset(iov
, 0, sizeof(struct iovec
));
660 file
= filp_open(path
, flags
, 0600);
661 if (IS_ERR(file
) || !file
|| !file
->f_dentry
) {
662 printk(KERN_ERR
"filp_open(%s) for ALUA metadata failed\n",
667 iov
[0].iov_base
= &md_buf
[0];
668 iov
[0].iov_len
= md_buf_len
;
672 ret
= vfs_writev(file
, &iov
[0], 1, &file
->f_pos
);
676 printk(KERN_ERR
"Error writing ALUA metadata file: %s\n", path
);
677 filp_close(file
, NULL
);
680 filp_close(file
, NULL
);
686 * Called with tg_pt_gp->tg_pt_gp_md_mutex held
688 static int core_alua_update_tpg_primary_metadata(
689 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
691 unsigned char *md_buf
)
693 struct se_subsystem_dev
*su_dev
= tg_pt_gp
->tg_pt_gp_su_dev
;
694 struct t10_wwn
*wwn
= &su_dev
->t10_wwn
;
695 char path
[ALUA_METADATA_PATH_LEN
];
698 memset(path
, 0, ALUA_METADATA_PATH_LEN
);
700 len
= snprintf(md_buf
, tg_pt_gp
->tg_pt_gp_md_buf_len
,
702 "alua_access_state=0x%02x\n"
703 "alua_access_status=0x%02x\n",
704 tg_pt_gp
->tg_pt_gp_id
, primary_state
,
705 tg_pt_gp
->tg_pt_gp_alua_access_status
);
707 snprintf(path
, ALUA_METADATA_PATH_LEN
,
708 "/var/target/alua/tpgs_%s/%s", &wwn
->unit_serial
[0],
709 config_item_name(&tg_pt_gp
->tg_pt_gp_group
.cg_item
));
711 return core_alua_write_tpg_metadata(path
, md_buf
, len
);
714 static int core_alua_do_transition_tg_pt(
715 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
716 struct se_port
*l_port
,
717 struct se_node_acl
*nacl
,
718 unsigned char *md_buf
,
722 struct se_dev_entry
*se_deve
;
723 struct se_lun_acl
*lacl
;
724 struct se_port
*port
;
725 struct t10_alua_tg_pt_gp_member
*mem
;
728 * Save the old primary ALUA access state, and set the current state
729 * to ALUA_ACCESS_STATE_TRANSITION.
731 old_state
= atomic_read(&tg_pt_gp
->tg_pt_gp_alua_access_state
);
732 atomic_set(&tg_pt_gp
->tg_pt_gp_alua_access_state
,
733 ALUA_ACCESS_STATE_TRANSITION
);
734 tg_pt_gp
->tg_pt_gp_alua_access_status
= (explict
) ?
735 ALUA_STATUS_ALTERED_BY_EXPLICT_STPG
:
736 ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA
;
738 * Check for the optional ALUA primary state transition delay
740 if (tg_pt_gp
->tg_pt_gp_trans_delay_msecs
!= 0)
741 msleep_interruptible(tg_pt_gp
->tg_pt_gp_trans_delay_msecs
);
743 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
744 list_for_each_entry(mem
, &tg_pt_gp
->tg_pt_gp_mem_list
,
748 * After an implicit target port asymmetric access state
749 * change, a device server shall establish a unit attention
750 * condition for the initiator port associated with every I_T
751 * nexus with the additional sense code set to ASYMMETRIC
752 * ACCESS STATE CHAGED.
754 * After an explicit target port asymmetric access state
755 * change, a device server shall establish a unit attention
756 * condition with the additional sense code set to ASYMMETRIC
757 * ACCESS STATE CHANGED for the initiator port associated with
758 * every I_T nexus other than the I_T nexus on which the SET
759 * TARGET PORT GROUPS command
761 atomic_inc(&mem
->tg_pt_gp_mem_ref_cnt
);
762 smp_mb__after_atomic_inc();
763 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
765 spin_lock_bh(&port
->sep_alua_lock
);
766 list_for_each_entry(se_deve
, &port
->sep_alua_list
,
768 lacl
= se_deve
->se_lun_acl
;
770 * se_deve->se_lun_acl pointer may be NULL for a
771 * entry created without explict Node+MappedLUN ACLs
777 (nacl
!= NULL
) && (nacl
== lacl
->se_lun_nacl
) &&
778 (l_port
!= NULL
) && (l_port
== port
))
781 core_scsi3_ua_allocate(lacl
->se_lun_nacl
,
782 se_deve
->mapped_lun
, 0x2A,
783 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED
);
785 spin_unlock_bh(&port
->sep_alua_lock
);
787 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
788 atomic_dec(&mem
->tg_pt_gp_mem_ref_cnt
);
789 smp_mb__after_atomic_dec();
791 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
793 * Update the ALUA metadata buf that has been allocated in
794 * core_alua_do_port_transition(), this metadata will be written
797 * Note that there is the case where we do not want to update the
798 * metadata when the saved metadata is being parsed in userspace
799 * when setting the existing port access state and access status.
801 * Also note that the failure to write out the ALUA metadata to
802 * struct file does NOT affect the actual ALUA transition.
804 if (tg_pt_gp
->tg_pt_gp_write_metadata
) {
805 mutex_lock(&tg_pt_gp
->tg_pt_gp_md_mutex
);
806 core_alua_update_tpg_primary_metadata(tg_pt_gp
,
808 mutex_unlock(&tg_pt_gp
->tg_pt_gp_md_mutex
);
811 * Set the current primary ALUA access state to the requested new state
813 atomic_set(&tg_pt_gp
->tg_pt_gp_alua_access_state
, new_state
);
815 printk(KERN_INFO
"Successful %s ALUA transition TG PT Group: %s ID: %hu"
816 " from primary access state %s to %s\n", (explict
) ? "explict" :
817 "implict", config_item_name(&tg_pt_gp
->tg_pt_gp_group
.cg_item
),
818 tg_pt_gp
->tg_pt_gp_id
, core_alua_dump_state(old_state
),
819 core_alua_dump_state(new_state
));
824 int core_alua_do_port_transition(
825 struct t10_alua_tg_pt_gp
*l_tg_pt_gp
,
826 struct se_device
*l_dev
,
827 struct se_port
*l_port
,
828 struct se_node_acl
*l_nacl
,
832 struct se_device
*dev
;
833 struct se_port
*port
;
834 struct se_subsystem_dev
*su_dev
;
835 struct se_node_acl
*nacl
;
836 struct t10_alua_lu_gp
*lu_gp
;
837 struct t10_alua_lu_gp_member
*lu_gp_mem
, *local_lu_gp_mem
;
838 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
839 unsigned char *md_buf
;
842 if (core_alua_check_transition(new_state
, &primary
) != 0)
845 md_buf
= kzalloc(l_tg_pt_gp
->tg_pt_gp_md_buf_len
, GFP_KERNEL
);
847 printk("Unable to allocate buf for ALUA metadata\n");
851 local_lu_gp_mem
= l_dev
->dev_alua_lu_gp_mem
;
852 spin_lock(&local_lu_gp_mem
->lu_gp_mem_lock
);
853 lu_gp
= local_lu_gp_mem
->lu_gp
;
854 atomic_inc(&lu_gp
->lu_gp_ref_cnt
);
855 smp_mb__after_atomic_inc();
856 spin_unlock(&local_lu_gp_mem
->lu_gp_mem_lock
);
858 * For storage objects that are members of the 'default_lu_gp',
859 * we only do transition on the passed *l_tp_pt_gp, and not
860 * on all of the matching target port groups IDs in default_lu_gp.
862 if (!(lu_gp
->lu_gp_id
)) {
864 * core_alua_do_transition_tg_pt() will always return
867 core_alua_do_transition_tg_pt(l_tg_pt_gp
, l_port
, l_nacl
,
868 md_buf
, new_state
, explict
);
869 atomic_dec(&lu_gp
->lu_gp_ref_cnt
);
870 smp_mb__after_atomic_dec();
875 * For all other LU groups aside from 'default_lu_gp', walk all of
876 * the associated storage objects looking for a matching target port
877 * group ID from the local target port group.
879 spin_lock(&lu_gp
->lu_gp_lock
);
880 list_for_each_entry(lu_gp_mem
, &lu_gp
->lu_gp_mem_list
,
883 dev
= lu_gp_mem
->lu_gp_mem_dev
;
884 su_dev
= dev
->se_sub_dev
;
885 atomic_inc(&lu_gp_mem
->lu_gp_mem_ref_cnt
);
886 smp_mb__after_atomic_inc();
887 spin_unlock(&lu_gp
->lu_gp_lock
);
889 spin_lock(&T10_ALUA(su_dev
)->tg_pt_gps_lock
);
890 list_for_each_entry(tg_pt_gp
,
891 &T10_ALUA(su_dev
)->tg_pt_gps_list
,
894 if (!(tg_pt_gp
->tg_pt_gp_valid_id
))
897 * If the target behavior port asymmetric access state
898 * is changed for any target port group accessiable via
899 * a logical unit within a LU group, the target port
900 * behavior group asymmetric access states for the same
901 * target port group accessible via other logical units
902 * in that LU group will also change.
904 if (l_tg_pt_gp
->tg_pt_gp_id
!= tg_pt_gp
->tg_pt_gp_id
)
907 if (l_tg_pt_gp
== tg_pt_gp
) {
914 atomic_inc(&tg_pt_gp
->tg_pt_gp_ref_cnt
);
915 smp_mb__after_atomic_inc();
916 spin_unlock(&T10_ALUA(su_dev
)->tg_pt_gps_lock
);
918 * core_alua_do_transition_tg_pt() will always return
921 core_alua_do_transition_tg_pt(tg_pt_gp
, port
,
922 nacl
, md_buf
, new_state
, explict
);
924 spin_lock(&T10_ALUA(su_dev
)->tg_pt_gps_lock
);
925 atomic_dec(&tg_pt_gp
->tg_pt_gp_ref_cnt
);
926 smp_mb__after_atomic_dec();
928 spin_unlock(&T10_ALUA(su_dev
)->tg_pt_gps_lock
);
930 spin_lock(&lu_gp
->lu_gp_lock
);
931 atomic_dec(&lu_gp_mem
->lu_gp_mem_ref_cnt
);
932 smp_mb__after_atomic_dec();
934 spin_unlock(&lu_gp
->lu_gp_lock
);
936 printk(KERN_INFO
"Successfully processed LU Group: %s all ALUA TG PT"
937 " Group IDs: %hu %s transition to primary state: %s\n",
938 config_item_name(&lu_gp
->lu_gp_group
.cg_item
),
939 l_tg_pt_gp
->tg_pt_gp_id
, (explict
) ? "explict" : "implict",
940 core_alua_dump_state(new_state
));
942 atomic_dec(&lu_gp
->lu_gp_ref_cnt
);
943 smp_mb__after_atomic_dec();
949 * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held
951 static int core_alua_update_tpg_secondary_metadata(
952 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
,
953 struct se_port
*port
,
954 unsigned char *md_buf
,
957 struct se_portal_group
*se_tpg
= port
->sep_tpg
;
958 char path
[ALUA_METADATA_PATH_LEN
], wwn
[ALUA_SECONDARY_METADATA_WWN_LEN
];
961 memset(path
, 0, ALUA_METADATA_PATH_LEN
);
962 memset(wwn
, 0, ALUA_SECONDARY_METADATA_WWN_LEN
);
964 len
= snprintf(wwn
, ALUA_SECONDARY_METADATA_WWN_LEN
, "%s",
965 TPG_TFO(se_tpg
)->tpg_get_wwn(se_tpg
));
967 if (TPG_TFO(se_tpg
)->tpg_get_tag
!= NULL
)
968 snprintf(wwn
+len
, ALUA_SECONDARY_METADATA_WWN_LEN
-len
, "+%hu",
969 TPG_TFO(se_tpg
)->tpg_get_tag(se_tpg
));
971 len
= snprintf(md_buf
, md_buf_len
, "alua_tg_pt_offline=%d\n"
972 "alua_tg_pt_status=0x%02x\n",
973 atomic_read(&port
->sep_tg_pt_secondary_offline
),
974 port
->sep_tg_pt_secondary_stat
);
976 snprintf(path
, ALUA_METADATA_PATH_LEN
, "/var/target/alua/%s/%s/lun_%u",
977 TPG_TFO(se_tpg
)->get_fabric_name(), wwn
,
978 port
->sep_lun
->unpacked_lun
);
980 return core_alua_write_tpg_metadata(path
, md_buf
, len
);
983 static int core_alua_set_tg_pt_secondary_state(
984 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
,
985 struct se_port
*port
,
989 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
990 unsigned char *md_buf
;
992 int trans_delay_msecs
;
994 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
995 tg_pt_gp
= tg_pt_gp_mem
->tg_pt_gp
;
997 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
998 printk(KERN_ERR
"Unable to complete secondary state"
1002 trans_delay_msecs
= tg_pt_gp
->tg_pt_gp_trans_delay_msecs
;
1004 * Set the secondary ALUA target port access state to OFFLINE
1005 * or release the previously secondary state for struct se_port
1008 atomic_set(&port
->sep_tg_pt_secondary_offline
, 1);
1010 atomic_set(&port
->sep_tg_pt_secondary_offline
, 0);
1012 md_buf_len
= tg_pt_gp
->tg_pt_gp_md_buf_len
;
1013 port
->sep_tg_pt_secondary_stat
= (explict
) ?
1014 ALUA_STATUS_ALTERED_BY_EXPLICT_STPG
:
1015 ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA
;
1017 printk(KERN_INFO
"Successful %s ALUA transition TG PT Group: %s ID: %hu"
1018 " to secondary access state: %s\n", (explict
) ? "explict" :
1019 "implict", config_item_name(&tg_pt_gp
->tg_pt_gp_group
.cg_item
),
1020 tg_pt_gp
->tg_pt_gp_id
, (offline
) ? "OFFLINE" : "ONLINE");
1022 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1024 * Do the optional transition delay after we set the secondary
1025 * ALUA access state.
1027 if (trans_delay_msecs
!= 0)
1028 msleep_interruptible(trans_delay_msecs
);
1030 * See if we need to update the ALUA fabric port metadata for
1031 * secondary state and status
1033 if (port
->sep_tg_pt_secondary_write_md
) {
1034 md_buf
= kzalloc(md_buf_len
, GFP_KERNEL
);
1036 printk(KERN_ERR
"Unable to allocate md_buf for"
1037 " secondary ALUA access metadata\n");
1040 mutex_lock(&port
->sep_tg_pt_md_mutex
);
1041 core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem
, port
,
1042 md_buf
, md_buf_len
);
1043 mutex_unlock(&port
->sep_tg_pt_md_mutex
);
1051 struct t10_alua_lu_gp
*
1052 core_alua_allocate_lu_gp(const char *name
, int def_group
)
1054 struct t10_alua_lu_gp
*lu_gp
;
1056 lu_gp
= kmem_cache_zalloc(t10_alua_lu_gp_cache
, GFP_KERNEL
);
1058 printk(KERN_ERR
"Unable to allocate struct t10_alua_lu_gp\n");
1059 return ERR_PTR(-ENOMEM
);
1061 INIT_LIST_HEAD(&lu_gp
->lu_gp_list
);
1062 INIT_LIST_HEAD(&lu_gp
->lu_gp_mem_list
);
1063 spin_lock_init(&lu_gp
->lu_gp_lock
);
1064 atomic_set(&lu_gp
->lu_gp_ref_cnt
, 0);
1067 lu_gp
->lu_gp_id
= se_global
->alua_lu_gps_counter
++;
1068 lu_gp
->lu_gp_valid_id
= 1;
1069 se_global
->alua_lu_gps_count
++;
1075 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp
*lu_gp
, u16 lu_gp_id
)
1077 struct t10_alua_lu_gp
*lu_gp_tmp
;
1080 * The lu_gp->lu_gp_id may only be set once..
1082 if (lu_gp
->lu_gp_valid_id
) {
1083 printk(KERN_WARNING
"ALUA LU Group already has a valid ID,"
1084 " ignoring request\n");
1088 spin_lock(&se_global
->lu_gps_lock
);
1089 if (se_global
->alua_lu_gps_count
== 0x0000ffff) {
1090 printk(KERN_ERR
"Maximum ALUA se_global->alua_lu_gps_count:"
1091 " 0x0000ffff reached\n");
1092 spin_unlock(&se_global
->lu_gps_lock
);
1093 kmem_cache_free(t10_alua_lu_gp_cache
, lu_gp
);
1097 lu_gp_id_tmp
= (lu_gp_id
!= 0) ? lu_gp_id
:
1098 se_global
->alua_lu_gps_counter
++;
1100 list_for_each_entry(lu_gp_tmp
, &se_global
->g_lu_gps_list
, lu_gp_list
) {
1101 if (lu_gp_tmp
->lu_gp_id
== lu_gp_id_tmp
) {
1105 printk(KERN_WARNING
"ALUA Logical Unit Group ID: %hu"
1106 " already exists, ignoring request\n",
1108 spin_unlock(&se_global
->lu_gps_lock
);
1113 lu_gp
->lu_gp_id
= lu_gp_id_tmp
;
1114 lu_gp
->lu_gp_valid_id
= 1;
1115 list_add_tail(&lu_gp
->lu_gp_list
, &se_global
->g_lu_gps_list
);
1116 se_global
->alua_lu_gps_count
++;
1117 spin_unlock(&se_global
->lu_gps_lock
);
1122 static struct t10_alua_lu_gp_member
*
1123 core_alua_allocate_lu_gp_mem(struct se_device
*dev
)
1125 struct t10_alua_lu_gp_member
*lu_gp_mem
;
1127 lu_gp_mem
= kmem_cache_zalloc(t10_alua_lu_gp_mem_cache
, GFP_KERNEL
);
1129 printk(KERN_ERR
"Unable to allocate struct t10_alua_lu_gp_member\n");
1130 return ERR_PTR(-ENOMEM
);
1132 INIT_LIST_HEAD(&lu_gp_mem
->lu_gp_mem_list
);
1133 spin_lock_init(&lu_gp_mem
->lu_gp_mem_lock
);
1134 atomic_set(&lu_gp_mem
->lu_gp_mem_ref_cnt
, 0);
1136 lu_gp_mem
->lu_gp_mem_dev
= dev
;
1137 dev
->dev_alua_lu_gp_mem
= lu_gp_mem
;
1142 void core_alua_free_lu_gp(struct t10_alua_lu_gp
*lu_gp
)
1144 struct t10_alua_lu_gp_member
*lu_gp_mem
, *lu_gp_mem_tmp
;
1146 * Once we have reached this point, config_item_put() has
1147 * already been called from target_core_alua_drop_lu_gp().
1149 * Here, we remove the *lu_gp from the global list so that
1150 * no associations can be made while we are releasing
1151 * struct t10_alua_lu_gp.
1153 spin_lock(&se_global
->lu_gps_lock
);
1154 atomic_set(&lu_gp
->lu_gp_shutdown
, 1);
1155 list_del(&lu_gp
->lu_gp_list
);
1156 se_global
->alua_lu_gps_count
--;
1157 spin_unlock(&se_global
->lu_gps_lock
);
1159 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1160 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1161 * released with core_alua_put_lu_gp_from_name()
1163 while (atomic_read(&lu_gp
->lu_gp_ref_cnt
))
1166 * Release reference to struct t10_alua_lu_gp * from all associated
1169 spin_lock(&lu_gp
->lu_gp_lock
);
1170 list_for_each_entry_safe(lu_gp_mem
, lu_gp_mem_tmp
,
1171 &lu_gp
->lu_gp_mem_list
, lu_gp_mem_list
) {
1172 if (lu_gp_mem
->lu_gp_assoc
) {
1173 list_del(&lu_gp_mem
->lu_gp_mem_list
);
1174 lu_gp
->lu_gp_members
--;
1175 lu_gp_mem
->lu_gp_assoc
= 0;
1177 spin_unlock(&lu_gp
->lu_gp_lock
);
1180 * lu_gp_mem is associated with a single
1181 * struct se_device->dev_alua_lu_gp_mem, and is released when
1182 * struct se_device is released via core_alua_free_lu_gp_mem().
1184 * If the passed lu_gp does NOT match the default_lu_gp, assume
1185 * we want to re-assocate a given lu_gp_mem with default_lu_gp.
1187 spin_lock(&lu_gp_mem
->lu_gp_mem_lock
);
1188 if (lu_gp
!= se_global
->default_lu_gp
)
1189 __core_alua_attach_lu_gp_mem(lu_gp_mem
,
1190 se_global
->default_lu_gp
);
1192 lu_gp_mem
->lu_gp
= NULL
;
1193 spin_unlock(&lu_gp_mem
->lu_gp_mem_lock
);
1195 spin_lock(&lu_gp
->lu_gp_lock
);
1197 spin_unlock(&lu_gp
->lu_gp_lock
);
1199 kmem_cache_free(t10_alua_lu_gp_cache
, lu_gp
);
1202 void core_alua_free_lu_gp_mem(struct se_device
*dev
)
1204 struct se_subsystem_dev
*su_dev
= dev
->se_sub_dev
;
1205 struct t10_alua
*alua
= T10_ALUA(su_dev
);
1206 struct t10_alua_lu_gp
*lu_gp
;
1207 struct t10_alua_lu_gp_member
*lu_gp_mem
;
1209 if (alua
->alua_type
!= SPC3_ALUA_EMULATED
)
1212 lu_gp_mem
= dev
->dev_alua_lu_gp_mem
;
1216 while (atomic_read(&lu_gp_mem
->lu_gp_mem_ref_cnt
))
1219 spin_lock(&lu_gp_mem
->lu_gp_mem_lock
);
1220 lu_gp
= lu_gp_mem
->lu_gp
;
1222 spin_lock(&lu_gp
->lu_gp_lock
);
1223 if (lu_gp_mem
->lu_gp_assoc
) {
1224 list_del(&lu_gp_mem
->lu_gp_mem_list
);
1225 lu_gp
->lu_gp_members
--;
1226 lu_gp_mem
->lu_gp_assoc
= 0;
1228 spin_unlock(&lu_gp
->lu_gp_lock
);
1229 lu_gp_mem
->lu_gp
= NULL
;
1231 spin_unlock(&lu_gp_mem
->lu_gp_mem_lock
);
1233 kmem_cache_free(t10_alua_lu_gp_mem_cache
, lu_gp_mem
);
1236 struct t10_alua_lu_gp
*core_alua_get_lu_gp_by_name(const char *name
)
1238 struct t10_alua_lu_gp
*lu_gp
;
1239 struct config_item
*ci
;
1241 spin_lock(&se_global
->lu_gps_lock
);
1242 list_for_each_entry(lu_gp
, &se_global
->g_lu_gps_list
, lu_gp_list
) {
1243 if (!(lu_gp
->lu_gp_valid_id
))
1245 ci
= &lu_gp
->lu_gp_group
.cg_item
;
1246 if (!(strcmp(config_item_name(ci
), name
))) {
1247 atomic_inc(&lu_gp
->lu_gp_ref_cnt
);
1248 spin_unlock(&se_global
->lu_gps_lock
);
1252 spin_unlock(&se_global
->lu_gps_lock
);
1257 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp
*lu_gp
)
1259 spin_lock(&se_global
->lu_gps_lock
);
1260 atomic_dec(&lu_gp
->lu_gp_ref_cnt
);
1261 spin_unlock(&se_global
->lu_gps_lock
);
1265 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1267 void __core_alua_attach_lu_gp_mem(
1268 struct t10_alua_lu_gp_member
*lu_gp_mem
,
1269 struct t10_alua_lu_gp
*lu_gp
)
1271 spin_lock(&lu_gp
->lu_gp_lock
);
1272 lu_gp_mem
->lu_gp
= lu_gp
;
1273 lu_gp_mem
->lu_gp_assoc
= 1;
1274 list_add_tail(&lu_gp_mem
->lu_gp_mem_list
, &lu_gp
->lu_gp_mem_list
);
1275 lu_gp
->lu_gp_members
++;
1276 spin_unlock(&lu_gp
->lu_gp_lock
);
1280 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1282 void __core_alua_drop_lu_gp_mem(
1283 struct t10_alua_lu_gp_member
*lu_gp_mem
,
1284 struct t10_alua_lu_gp
*lu_gp
)
1286 spin_lock(&lu_gp
->lu_gp_lock
);
1287 list_del(&lu_gp_mem
->lu_gp_mem_list
);
1288 lu_gp_mem
->lu_gp
= NULL
;
1289 lu_gp_mem
->lu_gp_assoc
= 0;
1290 lu_gp
->lu_gp_members
--;
1291 spin_unlock(&lu_gp
->lu_gp_lock
);
1294 struct t10_alua_tg_pt_gp
*core_alua_allocate_tg_pt_gp(
1295 struct se_subsystem_dev
*su_dev
,
1299 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
1301 tg_pt_gp
= kmem_cache_zalloc(t10_alua_tg_pt_gp_cache
, GFP_KERNEL
);
1303 printk(KERN_ERR
"Unable to allocate struct t10_alua_tg_pt_gp\n");
1306 INIT_LIST_HEAD(&tg_pt_gp
->tg_pt_gp_list
);
1307 INIT_LIST_HEAD(&tg_pt_gp
->tg_pt_gp_mem_list
);
1308 mutex_init(&tg_pt_gp
->tg_pt_gp_md_mutex
);
1309 spin_lock_init(&tg_pt_gp
->tg_pt_gp_lock
);
1310 atomic_set(&tg_pt_gp
->tg_pt_gp_ref_cnt
, 0);
1311 tg_pt_gp
->tg_pt_gp_su_dev
= su_dev
;
1312 tg_pt_gp
->tg_pt_gp_md_buf_len
= ALUA_MD_BUF_LEN
;
1313 atomic_set(&tg_pt_gp
->tg_pt_gp_alua_access_state
,
1314 ALUA_ACCESS_STATE_ACTIVE_OPTMIZED
);
1316 * Enable both explict and implict ALUA support by default
1318 tg_pt_gp
->tg_pt_gp_alua_access_type
=
1319 TPGS_EXPLICT_ALUA
| TPGS_IMPLICT_ALUA
;
1321 * Set the default Active/NonOptimized Delay in milliseconds
1323 tg_pt_gp
->tg_pt_gp_nonop_delay_msecs
= ALUA_DEFAULT_NONOP_DELAY_MSECS
;
1324 tg_pt_gp
->tg_pt_gp_trans_delay_msecs
= ALUA_DEFAULT_TRANS_DELAY_MSECS
;
1327 spin_lock(&T10_ALUA(su_dev
)->tg_pt_gps_lock
);
1328 tg_pt_gp
->tg_pt_gp_id
=
1329 T10_ALUA(su_dev
)->alua_tg_pt_gps_counter
++;
1330 tg_pt_gp
->tg_pt_gp_valid_id
= 1;
1331 T10_ALUA(su_dev
)->alua_tg_pt_gps_count
++;
1332 list_add_tail(&tg_pt_gp
->tg_pt_gp_list
,
1333 &T10_ALUA(su_dev
)->tg_pt_gps_list
);
1334 spin_unlock(&T10_ALUA(su_dev
)->tg_pt_gps_lock
);
1340 int core_alua_set_tg_pt_gp_id(
1341 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1344 struct se_subsystem_dev
*su_dev
= tg_pt_gp
->tg_pt_gp_su_dev
;
1345 struct t10_alua_tg_pt_gp
*tg_pt_gp_tmp
;
1346 u16 tg_pt_gp_id_tmp
;
1348 * The tg_pt_gp->tg_pt_gp_id may only be set once..
1350 if (tg_pt_gp
->tg_pt_gp_valid_id
) {
1351 printk(KERN_WARNING
"ALUA TG PT Group already has a valid ID,"
1352 " ignoring request\n");
1356 spin_lock(&T10_ALUA(su_dev
)->tg_pt_gps_lock
);
1357 if (T10_ALUA(su_dev
)->alua_tg_pt_gps_count
== 0x0000ffff) {
1358 printk(KERN_ERR
"Maximum ALUA alua_tg_pt_gps_count:"
1359 " 0x0000ffff reached\n");
1360 spin_unlock(&T10_ALUA(su_dev
)->tg_pt_gps_lock
);
1361 kmem_cache_free(t10_alua_tg_pt_gp_cache
, tg_pt_gp
);
1365 tg_pt_gp_id_tmp
= (tg_pt_gp_id
!= 0) ? tg_pt_gp_id
:
1366 T10_ALUA(su_dev
)->alua_tg_pt_gps_counter
++;
1368 list_for_each_entry(tg_pt_gp_tmp
, &T10_ALUA(su_dev
)->tg_pt_gps_list
,
1370 if (tg_pt_gp_tmp
->tg_pt_gp_id
== tg_pt_gp_id_tmp
) {
1374 printk(KERN_ERR
"ALUA Target Port Group ID: %hu already"
1375 " exists, ignoring request\n", tg_pt_gp_id
);
1376 spin_unlock(&T10_ALUA(su_dev
)->tg_pt_gps_lock
);
1381 tg_pt_gp
->tg_pt_gp_id
= tg_pt_gp_id_tmp
;
1382 tg_pt_gp
->tg_pt_gp_valid_id
= 1;
1383 list_add_tail(&tg_pt_gp
->tg_pt_gp_list
,
1384 &T10_ALUA(su_dev
)->tg_pt_gps_list
);
1385 T10_ALUA(su_dev
)->alua_tg_pt_gps_count
++;
1386 spin_unlock(&T10_ALUA(su_dev
)->tg_pt_gps_lock
);
1391 struct t10_alua_tg_pt_gp_member
*core_alua_allocate_tg_pt_gp_mem(
1392 struct se_port
*port
)
1394 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
1396 tg_pt_gp_mem
= kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache
,
1398 if (!(tg_pt_gp_mem
)) {
1399 printk(KERN_ERR
"Unable to allocate struct t10_alua_tg_pt_gp_member\n");
1400 return ERR_PTR(-ENOMEM
);
1402 INIT_LIST_HEAD(&tg_pt_gp_mem
->tg_pt_gp_mem_list
);
1403 spin_lock_init(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1404 atomic_set(&tg_pt_gp_mem
->tg_pt_gp_mem_ref_cnt
, 0);
1406 tg_pt_gp_mem
->tg_pt
= port
;
1407 port
->sep_alua_tg_pt_gp_mem
= tg_pt_gp_mem
;
1408 atomic_set(&port
->sep_tg_pt_gp_active
, 1);
1410 return tg_pt_gp_mem
;
1413 void core_alua_free_tg_pt_gp(
1414 struct t10_alua_tg_pt_gp
*tg_pt_gp
)
1416 struct se_subsystem_dev
*su_dev
= tg_pt_gp
->tg_pt_gp_su_dev
;
1417 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
, *tg_pt_gp_mem_tmp
;
1419 * Once we have reached this point, config_item_put() has already
1420 * been called from target_core_alua_drop_tg_pt_gp().
1422 * Here we remove *tg_pt_gp from the global list so that
1423 * no assications *OR* explict ALUA via SET_TARGET_PORT_GROUPS
1424 * can be made while we are releasing struct t10_alua_tg_pt_gp.
1426 spin_lock(&T10_ALUA(su_dev
)->tg_pt_gps_lock
);
1427 list_del(&tg_pt_gp
->tg_pt_gp_list
);
1428 T10_ALUA(su_dev
)->alua_tg_pt_gps_counter
--;
1429 spin_unlock(&T10_ALUA(su_dev
)->tg_pt_gps_lock
);
1431 * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1432 * core_alua_get_tg_pt_gp_by_name() in
1433 * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1434 * to be released with core_alua_put_tg_pt_gp_from_name().
1436 while (atomic_read(&tg_pt_gp
->tg_pt_gp_ref_cnt
))
1439 * Release reference to struct t10_alua_tg_pt_gp from all associated
1442 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
1443 list_for_each_entry_safe(tg_pt_gp_mem
, tg_pt_gp_mem_tmp
,
1444 &tg_pt_gp
->tg_pt_gp_mem_list
, tg_pt_gp_mem_list
) {
1445 if (tg_pt_gp_mem
->tg_pt_gp_assoc
) {
1446 list_del(&tg_pt_gp_mem
->tg_pt_gp_mem_list
);
1447 tg_pt_gp
->tg_pt_gp_members
--;
1448 tg_pt_gp_mem
->tg_pt_gp_assoc
= 0;
1450 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
1452 * tg_pt_gp_mem is associated with a single
1453 * se_port->sep_alua_tg_pt_gp_mem, and is released via
1454 * core_alua_free_tg_pt_gp_mem().
1456 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1457 * assume we want to re-assocate a given tg_pt_gp_mem with
1460 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1461 if (tg_pt_gp
!= T10_ALUA(su_dev
)->default_tg_pt_gp
) {
1462 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem
,
1463 T10_ALUA(su_dev
)->default_tg_pt_gp
);
1465 tg_pt_gp_mem
->tg_pt_gp
= NULL
;
1466 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1468 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
1470 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
1472 kmem_cache_free(t10_alua_tg_pt_gp_cache
, tg_pt_gp
);
1475 void core_alua_free_tg_pt_gp_mem(struct se_port
*port
)
1477 struct se_subsystem_dev
*su_dev
= port
->sep_lun
->lun_se_dev
->se_sub_dev
;
1478 struct t10_alua
*alua
= T10_ALUA(su_dev
);
1479 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
1480 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
1482 if (alua
->alua_type
!= SPC3_ALUA_EMULATED
)
1485 tg_pt_gp_mem
= port
->sep_alua_tg_pt_gp_mem
;
1486 if (!(tg_pt_gp_mem
))
1489 while (atomic_read(&tg_pt_gp_mem
->tg_pt_gp_mem_ref_cnt
))
1492 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1493 tg_pt_gp
= tg_pt_gp_mem
->tg_pt_gp
;
1495 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
1496 if (tg_pt_gp_mem
->tg_pt_gp_assoc
) {
1497 list_del(&tg_pt_gp_mem
->tg_pt_gp_mem_list
);
1498 tg_pt_gp
->tg_pt_gp_members
--;
1499 tg_pt_gp_mem
->tg_pt_gp_assoc
= 0;
1501 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
1502 tg_pt_gp_mem
->tg_pt_gp
= NULL
;
1504 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1506 kmem_cache_free(t10_alua_tg_pt_gp_mem_cache
, tg_pt_gp_mem
);
1509 static struct t10_alua_tg_pt_gp
*core_alua_get_tg_pt_gp_by_name(
1510 struct se_subsystem_dev
*su_dev
,
1513 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
1514 struct config_item
*ci
;
1516 spin_lock(&T10_ALUA(su_dev
)->tg_pt_gps_lock
);
1517 list_for_each_entry(tg_pt_gp
, &T10_ALUA(su_dev
)->tg_pt_gps_list
,
1519 if (!(tg_pt_gp
->tg_pt_gp_valid_id
))
1521 ci
= &tg_pt_gp
->tg_pt_gp_group
.cg_item
;
1522 if (!(strcmp(config_item_name(ci
), name
))) {
1523 atomic_inc(&tg_pt_gp
->tg_pt_gp_ref_cnt
);
1524 spin_unlock(&T10_ALUA(su_dev
)->tg_pt_gps_lock
);
1528 spin_unlock(&T10_ALUA(su_dev
)->tg_pt_gps_lock
);
1533 static void core_alua_put_tg_pt_gp_from_name(
1534 struct t10_alua_tg_pt_gp
*tg_pt_gp
)
1536 struct se_subsystem_dev
*su_dev
= tg_pt_gp
->tg_pt_gp_su_dev
;
1538 spin_lock(&T10_ALUA(su_dev
)->tg_pt_gps_lock
);
1539 atomic_dec(&tg_pt_gp
->tg_pt_gp_ref_cnt
);
1540 spin_unlock(&T10_ALUA(su_dev
)->tg_pt_gps_lock
);
1544 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1546 void __core_alua_attach_tg_pt_gp_mem(
1547 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
,
1548 struct t10_alua_tg_pt_gp
*tg_pt_gp
)
1550 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
1551 tg_pt_gp_mem
->tg_pt_gp
= tg_pt_gp
;
1552 tg_pt_gp_mem
->tg_pt_gp_assoc
= 1;
1553 list_add_tail(&tg_pt_gp_mem
->tg_pt_gp_mem_list
,
1554 &tg_pt_gp
->tg_pt_gp_mem_list
);
1555 tg_pt_gp
->tg_pt_gp_members
++;
1556 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
1560 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1562 static void __core_alua_drop_tg_pt_gp_mem(
1563 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
,
1564 struct t10_alua_tg_pt_gp
*tg_pt_gp
)
1566 spin_lock(&tg_pt_gp
->tg_pt_gp_lock
);
1567 list_del(&tg_pt_gp_mem
->tg_pt_gp_mem_list
);
1568 tg_pt_gp_mem
->tg_pt_gp
= NULL
;
1569 tg_pt_gp_mem
->tg_pt_gp_assoc
= 0;
1570 tg_pt_gp
->tg_pt_gp_members
--;
1571 spin_unlock(&tg_pt_gp
->tg_pt_gp_lock
);
1574 ssize_t
core_alua_show_tg_pt_gp_info(struct se_port
*port
, char *page
)
1576 struct se_subsystem_dev
*su_dev
= port
->sep_lun
->lun_se_dev
->se_sub_dev
;
1577 struct config_item
*tg_pt_ci
;
1578 struct t10_alua
*alua
= T10_ALUA(su_dev
);
1579 struct t10_alua_tg_pt_gp
*tg_pt_gp
;
1580 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
1583 if (alua
->alua_type
!= SPC3_ALUA_EMULATED
)
1586 tg_pt_gp_mem
= port
->sep_alua_tg_pt_gp_mem
;
1587 if (!(tg_pt_gp_mem
))
1590 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1591 tg_pt_gp
= tg_pt_gp_mem
->tg_pt_gp
;
1593 tg_pt_ci
= &tg_pt_gp
->tg_pt_gp_group
.cg_item
;
1594 len
+= sprintf(page
, "TG Port Alias: %s\nTG Port Group ID:"
1595 " %hu\nTG Port Primary Access State: %s\nTG Port "
1596 "Primary Access Status: %s\nTG Port Secondary Access"
1597 " State: %s\nTG Port Secondary Access Status: %s\n",
1598 config_item_name(tg_pt_ci
), tg_pt_gp
->tg_pt_gp_id
,
1599 core_alua_dump_state(atomic_read(
1600 &tg_pt_gp
->tg_pt_gp_alua_access_state
)),
1601 core_alua_dump_status(
1602 tg_pt_gp
->tg_pt_gp_alua_access_status
),
1603 (atomic_read(&port
->sep_tg_pt_secondary_offline
)) ?
1605 core_alua_dump_status(port
->sep_tg_pt_secondary_stat
));
1607 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1612 ssize_t
core_alua_store_tg_pt_gp_info(
1613 struct se_port
*port
,
1617 struct se_portal_group
*tpg
;
1619 struct se_subsystem_dev
*su_dev
= port
->sep_lun
->lun_se_dev
->se_sub_dev
;
1620 struct t10_alua_tg_pt_gp
*tg_pt_gp
= NULL
, *tg_pt_gp_new
= NULL
;
1621 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
1622 unsigned char buf
[TG_PT_GROUP_NAME_BUF
];
1625 tpg
= port
->sep_tpg
;
1626 lun
= port
->sep_lun
;
1628 if (T10_ALUA(su_dev
)->alua_type
!= SPC3_ALUA_EMULATED
) {
1629 printk(KERN_WARNING
"SPC3_ALUA_EMULATED not enabled for"
1630 " %s/tpgt_%hu/%s\n", TPG_TFO(tpg
)->tpg_get_wwn(tpg
),
1631 TPG_TFO(tpg
)->tpg_get_tag(tpg
),
1632 config_item_name(&lun
->lun_group
.cg_item
));
1636 if (count
> TG_PT_GROUP_NAME_BUF
) {
1637 printk(KERN_ERR
"ALUA Target Port Group alias too large!\n");
1640 memset(buf
, 0, TG_PT_GROUP_NAME_BUF
);
1641 memcpy(buf
, page
, count
);
1643 * Any ALUA target port group alias besides "NULL" means we will be
1644 * making a new group association.
1646 if (strcmp(strstrip(buf
), "NULL")) {
1648 * core_alua_get_tg_pt_gp_by_name() will increment reference to
1649 * struct t10_alua_tg_pt_gp. This reference is released with
1650 * core_alua_put_tg_pt_gp_from_name() below.
1652 tg_pt_gp_new
= core_alua_get_tg_pt_gp_by_name(su_dev
,
1654 if (!(tg_pt_gp_new
))
1657 tg_pt_gp_mem
= port
->sep_alua_tg_pt_gp_mem
;
1658 if (!(tg_pt_gp_mem
)) {
1660 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new
);
1661 printk(KERN_ERR
"NULL struct se_port->sep_alua_tg_pt_gp_mem pointer\n");
1665 spin_lock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1666 tg_pt_gp
= tg_pt_gp_mem
->tg_pt_gp
;
1669 * Clearing an existing tg_pt_gp association, and replacing
1670 * with the default_tg_pt_gp.
1672 if (!(tg_pt_gp_new
)) {
1673 printk(KERN_INFO
"Target_Core_ConfigFS: Moving"
1674 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
1675 " alua/%s, ID: %hu back to"
1676 " default_tg_pt_gp\n",
1677 TPG_TFO(tpg
)->tpg_get_wwn(tpg
),
1678 TPG_TFO(tpg
)->tpg_get_tag(tpg
),
1679 config_item_name(&lun
->lun_group
.cg_item
),
1681 &tg_pt_gp
->tg_pt_gp_group
.cg_item
),
1682 tg_pt_gp
->tg_pt_gp_id
);
1684 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem
, tg_pt_gp
);
1685 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem
,
1686 T10_ALUA(su_dev
)->default_tg_pt_gp
);
1687 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1692 * Removing existing association of tg_pt_gp_mem with tg_pt_gp
1694 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem
, tg_pt_gp
);
1698 * Associate tg_pt_gp_mem with tg_pt_gp_new.
1700 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem
, tg_pt_gp_new
);
1701 spin_unlock(&tg_pt_gp_mem
->tg_pt_gp_mem_lock
);
1702 printk(KERN_INFO
"Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
1703 " Target Port Group: alua/%s, ID: %hu\n", (move
) ?
1704 "Moving" : "Adding", TPG_TFO(tpg
)->tpg_get_wwn(tpg
),
1705 TPG_TFO(tpg
)->tpg_get_tag(tpg
),
1706 config_item_name(&lun
->lun_group
.cg_item
),
1707 config_item_name(&tg_pt_gp_new
->tg_pt_gp_group
.cg_item
),
1708 tg_pt_gp_new
->tg_pt_gp_id
);
1710 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new
);
1714 ssize_t
core_alua_show_access_type(
1715 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1718 if ((tg_pt_gp
->tg_pt_gp_alua_access_type
& TPGS_EXPLICT_ALUA
) &&
1719 (tg_pt_gp
->tg_pt_gp_alua_access_type
& TPGS_IMPLICT_ALUA
))
1720 return sprintf(page
, "Implict and Explict\n");
1721 else if (tg_pt_gp
->tg_pt_gp_alua_access_type
& TPGS_IMPLICT_ALUA
)
1722 return sprintf(page
, "Implict\n");
1723 else if (tg_pt_gp
->tg_pt_gp_alua_access_type
& TPGS_EXPLICT_ALUA
)
1724 return sprintf(page
, "Explict\n");
1726 return sprintf(page
, "None\n");
1729 ssize_t
core_alua_store_access_type(
1730 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1737 ret
= strict_strtoul(page
, 0, &tmp
);
1739 printk(KERN_ERR
"Unable to extract alua_access_type\n");
1742 if ((tmp
!= 0) && (tmp
!= 1) && (tmp
!= 2) && (tmp
!= 3)) {
1743 printk(KERN_ERR
"Illegal value for alua_access_type:"
1748 tg_pt_gp
->tg_pt_gp_alua_access_type
=
1749 TPGS_IMPLICT_ALUA
| TPGS_EXPLICT_ALUA
;
1751 tg_pt_gp
->tg_pt_gp_alua_access_type
= TPGS_EXPLICT_ALUA
;
1753 tg_pt_gp
->tg_pt_gp_alua_access_type
= TPGS_IMPLICT_ALUA
;
1755 tg_pt_gp
->tg_pt_gp_alua_access_type
= 0;
1760 ssize_t
core_alua_show_nonop_delay_msecs(
1761 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1764 return sprintf(page
, "%d\n", tg_pt_gp
->tg_pt_gp_nonop_delay_msecs
);
1767 ssize_t
core_alua_store_nonop_delay_msecs(
1768 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1775 ret
= strict_strtoul(page
, 0, &tmp
);
1777 printk(KERN_ERR
"Unable to extract nonop_delay_msecs\n");
1780 if (tmp
> ALUA_MAX_NONOP_DELAY_MSECS
) {
1781 printk(KERN_ERR
"Passed nonop_delay_msecs: %lu, exceeds"
1782 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp
,
1783 ALUA_MAX_NONOP_DELAY_MSECS
);
1786 tg_pt_gp
->tg_pt_gp_nonop_delay_msecs
= (int)tmp
;
1791 ssize_t
core_alua_show_trans_delay_msecs(
1792 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1795 return sprintf(page
, "%d\n", tg_pt_gp
->tg_pt_gp_trans_delay_msecs
);
1798 ssize_t
core_alua_store_trans_delay_msecs(
1799 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1806 ret
= strict_strtoul(page
, 0, &tmp
);
1808 printk(KERN_ERR
"Unable to extract trans_delay_msecs\n");
1811 if (tmp
> ALUA_MAX_TRANS_DELAY_MSECS
) {
1812 printk(KERN_ERR
"Passed trans_delay_msecs: %lu, exceeds"
1813 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp
,
1814 ALUA_MAX_TRANS_DELAY_MSECS
);
1817 tg_pt_gp
->tg_pt_gp_trans_delay_msecs
= (int)tmp
;
1822 ssize_t
core_alua_show_preferred_bit(
1823 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1826 return sprintf(page
, "%d\n", tg_pt_gp
->tg_pt_gp_pref
);
1829 ssize_t
core_alua_store_preferred_bit(
1830 struct t10_alua_tg_pt_gp
*tg_pt_gp
,
1837 ret
= strict_strtoul(page
, 0, &tmp
);
1839 printk(KERN_ERR
"Unable to extract preferred ALUA value\n");
1842 if ((tmp
!= 0) && (tmp
!= 1)) {
1843 printk(KERN_ERR
"Illegal value for preferred ALUA: %lu\n", tmp
);
1846 tg_pt_gp
->tg_pt_gp_pref
= (int)tmp
;
1851 ssize_t
core_alua_show_offline_bit(struct se_lun
*lun
, char *page
)
1853 if (!(lun
->lun_sep
))
1856 return sprintf(page
, "%d\n",
1857 atomic_read(&lun
->lun_sep
->sep_tg_pt_secondary_offline
));
1860 ssize_t
core_alua_store_offline_bit(
1865 struct t10_alua_tg_pt_gp_member
*tg_pt_gp_mem
;
1869 if (!(lun
->lun_sep
))
1872 ret
= strict_strtoul(page
, 0, &tmp
);
1874 printk(KERN_ERR
"Unable to extract alua_tg_pt_offline value\n");
1877 if ((tmp
!= 0) && (tmp
!= 1)) {
1878 printk(KERN_ERR
"Illegal value for alua_tg_pt_offline: %lu\n",
1882 tg_pt_gp_mem
= lun
->lun_sep
->sep_alua_tg_pt_gp_mem
;
1883 if (!(tg_pt_gp_mem
)) {
1884 printk(KERN_ERR
"Unable to locate *tg_pt_gp_mem\n");
1888 ret
= core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem
,
1889 lun
->lun_sep
, 0, (int)tmp
);
1896 ssize_t
core_alua_show_secondary_status(
1900 return sprintf(page
, "%d\n", lun
->lun_sep
->sep_tg_pt_secondary_stat
);
1903 ssize_t
core_alua_store_secondary_status(
1911 ret
= strict_strtoul(page
, 0, &tmp
);
1913 printk(KERN_ERR
"Unable to extract alua_tg_pt_status\n");
1916 if ((tmp
!= ALUA_STATUS_NONE
) &&
1917 (tmp
!= ALUA_STATUS_ALTERED_BY_EXPLICT_STPG
) &&
1918 (tmp
!= ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA
)) {
1919 printk(KERN_ERR
"Illegal value for alua_tg_pt_status: %lu\n",
1923 lun
->lun_sep
->sep_tg_pt_secondary_stat
= (int)tmp
;
1928 ssize_t
core_alua_show_secondary_write_metadata(
1932 return sprintf(page
, "%d\n",
1933 lun
->lun_sep
->sep_tg_pt_secondary_write_md
);
1936 ssize_t
core_alua_store_secondary_write_metadata(
1944 ret
= strict_strtoul(page
, 0, &tmp
);
1946 printk(KERN_ERR
"Unable to extract alua_tg_pt_write_md\n");
1949 if ((tmp
!= 0) && (tmp
!= 1)) {
1950 printk(KERN_ERR
"Illegal value for alua_tg_pt_write_md:"
1954 lun
->lun_sep
->sep_tg_pt_secondary_write_md
= (int)tmp
;
1959 int core_setup_alua(struct se_device
*dev
, int force_pt
)
1961 struct se_subsystem_dev
*su_dev
= dev
->se_sub_dev
;
1962 struct t10_alua
*alua
= T10_ALUA(su_dev
);
1963 struct t10_alua_lu_gp_member
*lu_gp_mem
;
1965 * If this device is from Target_Core_Mod/pSCSI, use the ALUA logic
1966 * of the Underlying SCSI hardware. In Linux/SCSI terms, this can
1967 * cause a problem because libata and some SATA RAID HBAs appear
1968 * under Linux/SCSI, but emulate SCSI logic themselves.
1970 if (((TRANSPORT(dev
)->transport_type
== TRANSPORT_PLUGIN_PHBA_PDEV
) &&
1971 !(DEV_ATTRIB(dev
)->emulate_alua
)) || force_pt
) {
1972 alua
->alua_type
= SPC_ALUA_PASSTHROUGH
;
1973 alua
->alua_state_check
= &core_alua_state_check_nop
;
1974 printk(KERN_INFO
"%s: Using SPC_ALUA_PASSTHROUGH, no ALUA"
1975 " emulation\n", TRANSPORT(dev
)->name
);
1979 * If SPC-3 or above is reported by real or emulated struct se_device,
1980 * use emulated ALUA.
1982 if (TRANSPORT(dev
)->get_device_rev(dev
) >= SCSI_3
) {
1983 printk(KERN_INFO
"%s: Enabling ALUA Emulation for SPC-3"
1984 " device\n", TRANSPORT(dev
)->name
);
1986 * Associate this struct se_device with the default ALUA
1989 lu_gp_mem
= core_alua_allocate_lu_gp_mem(dev
);
1990 if (IS_ERR(lu_gp_mem
) || !lu_gp_mem
)
1993 alua
->alua_type
= SPC3_ALUA_EMULATED
;
1994 alua
->alua_state_check
= &core_alua_state_check
;
1995 spin_lock(&lu_gp_mem
->lu_gp_mem_lock
);
1996 __core_alua_attach_lu_gp_mem(lu_gp_mem
,
1997 se_global
->default_lu_gp
);
1998 spin_unlock(&lu_gp_mem
->lu_gp_mem_lock
);
2000 printk(KERN_INFO
"%s: Adding to default ALUA LU Group:"
2001 " core/alua/lu_gps/default_lu_gp\n",
2002 TRANSPORT(dev
)->name
);
2004 alua
->alua_type
= SPC2_ALUA_DISABLED
;
2005 alua
->alua_state_check
= &core_alua_state_check_nop
;
2006 printk(KERN_INFO
"%s: Disabling ALUA Emulation for SPC-2"
2007 " device\n", TRANSPORT(dev
)->name
);