1 /*******************************************************************************
2 * Filename: target_core_alua.c
4 * This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA)
6 * (c) Copyright 2009-2013 Datera, Inc.
8 * Nicholas A. Bellinger <nab@kernel.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 ******************************************************************************/
26 #include <linux/slab.h>
27 #include <linux/spinlock.h>
28 #include <linux/configfs.h>
29 #include <linux/export.h>
30 #include <linux/file.h>
31 #include <scsi/scsi_proto.h>
32 #include <asm/unaligned.h>
34 #include <target/target_core_base.h>
35 #include <target/target_core_backend.h>
36 #include <target/target_core_fabric.h>
37 #include <target/target_core_configfs.h>
39 #include "target_core_internal.h"
40 #include "target_core_alua.h"
41 #include "target_core_ua.h"
43 static sense_reason_t core_alua_check_transition(int state, int valid,
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 explicit, int offline);
49 static char *core_alua_dump_state(int state);
51 static u16 alua_lu_gps_counter;
52 static u32 alua_lu_gps_count;
54 static DEFINE_SPINLOCK(lu_gps_lock);
55 static LIST_HEAD(lu_gps_list);
57 struct t10_alua_lu_gp *default_lu_gp;
62 * See sbc3r35 section 5.23
65 target_emulate_report_referrals(struct se_cmd *cmd)
67 struct se_device *dev = cmd->se_dev;
68 struct t10_alua_lba_map *map;
69 struct t10_alua_lba_map_member *map_mem;
73 if (cmd->data_length < 4) {
74 pr_warn("REPORT REFERRALS allocation length %u too"
75 " small\n", cmd->data_length);
76 return TCM_INVALID_CDB_FIELD;
79 buf = transport_kmap_data_sg(cmd);
81 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
84 spin_lock(&dev->t10_alua.lba_map_lock);
85 if (list_empty(&dev->t10_alua.lba_map_list)) {
86 spin_unlock(&dev->t10_alua.lba_map_lock);
87 transport_kunmap_data_sg(cmd);
89 return TCM_UNSUPPORTED_SCSI_OPCODE;
92 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
94 int desc_num = off + 3;
98 if (cmd->data_length > off)
99 put_unaligned_be64(map->lba_map_first_lba, &buf[off]);
101 if (cmd->data_length > off)
102 put_unaligned_be64(map->lba_map_last_lba, &buf[off]);
106 list_for_each_entry(map_mem, &map->lba_map_mem_list,
108 int alua_state = map_mem->lba_map_mem_alua_state;
109 int alua_pg_id = map_mem->lba_map_mem_alua_pg_id;
111 if (cmd->data_length > off)
112 buf[off] = alua_state & 0x0f;
114 if (cmd->data_length > off)
115 buf[off] = (alua_pg_id >> 8) & 0xff;
117 if (cmd->data_length > off)
118 buf[off] = (alua_pg_id & 0xff);
123 if (cmd->data_length > desc_num)
124 buf[desc_num] = pg_num;
126 spin_unlock(&dev->t10_alua.lba_map_lock);
129 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
131 put_unaligned_be16(rd_len, &buf[2]);
133 transport_kunmap_data_sg(cmd);
135 target_complete_cmd(cmd, GOOD);
140 * REPORT_TARGET_PORT_GROUPS
142 * See spc4r17 section 6.27
145 target_emulate_report_target_port_groups(struct se_cmd *cmd)
147 struct se_device *dev = cmd->se_dev;
148 struct se_port *port;
149 struct t10_alua_tg_pt_gp *tg_pt_gp;
150 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
153 int ext_hdr = (cmd->t_task_cdb[1] & 0x20);
156 * Skip over RESERVED area to first Target port group descriptor
157 * depending on the PARAMETER DATA FORMAT type..
164 if (cmd->data_length < off) {
165 pr_warn("REPORT TARGET PORT GROUPS allocation length %u too"
166 " small for %s header\n", cmd->data_length,
167 (ext_hdr) ? "extended" : "normal");
168 return TCM_INVALID_CDB_FIELD;
170 buf = transport_kmap_data_sg(cmd);
172 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
174 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
175 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
178 * Check if the Target port group and Target port descriptor list
179 * based on tg_pt_gp_members count will fit into the response payload.
180 * Otherwise, bump rd_len to let the initiator know we have exceeded
181 * the allocation length and the response is truncated.
183 if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) >
185 rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4);
189 * PREF: Preferred target port bit, determine if this
190 * bit should be set for port group.
192 if (tg_pt_gp->tg_pt_gp_pref)
195 * Set the ASYMMETRIC ACCESS State
197 buf[off++] |= (atomic_read(
198 &tg_pt_gp->tg_pt_gp_alua_access_state) & 0xff);
200 * Set supported ASYMMETRIC ACCESS State bits
202 buf[off++] |= tg_pt_gp->tg_pt_gp_alua_supported_states;
206 buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff);
207 buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff);
209 off++; /* Skip over Reserved */
213 buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff);
215 * Vendor Specific field
221 buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff);
224 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
225 list_for_each_entry(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list,
227 port = tg_pt_gp_mem->tg_pt;
229 * Start Target Port descriptor format
231 * See spc4r17 section 6.2.7 Table 247
233 off += 2; /* Skip over Obsolete */
235 * Set RELATIVE TARGET PORT IDENTIFIER
237 buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
238 buf[off++] = (port->sep_rtpi & 0xff);
241 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
243 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
245 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
247 put_unaligned_be32(rd_len, &buf[0]);
250 * Fill in the Extended header parameter data format if requested
255 * Set the implicit transition time (in seconds) for the application
256 * client to use as a base for it's transition timeout value.
258 * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN
259 * this CDB was received upon to determine this value individually
260 * for ALUA target port group.
262 port = cmd->se_lun->lun_sep;
263 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
265 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
266 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
268 buf[5] = tg_pt_gp->tg_pt_gp_implicit_trans_secs;
269 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
272 transport_kunmap_data_sg(cmd);
274 target_complete_cmd(cmd, GOOD);
279 * SET_TARGET_PORT_GROUPS for explicit ALUA operation.
281 * See spc4r17 section 6.35
284 target_emulate_set_target_port_groups(struct se_cmd *cmd)
286 struct se_device *dev = cmd->se_dev;
287 struct se_port *port, *l_port = cmd->se_lun->lun_sep;
288 struct se_node_acl *nacl = cmd->se_sess->se_node_acl;
289 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp;
290 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem;
293 sense_reason_t rc = TCM_NO_SENSE;
294 u32 len = 4; /* Skip over RESERVED area in header */
295 int alua_access_state, primary = 0, valid_states;
299 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
301 if (cmd->data_length < 4) {
302 pr_warn("SET TARGET PORT GROUPS parameter list length %u too"
303 " small\n", cmd->data_length);
304 return TCM_INVALID_PARAMETER_LIST;
307 buf = transport_kmap_data_sg(cmd);
309 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
312 * Determine if explicit ALUA via SET_TARGET_PORT_GROUPS is allowed
313 * for the local tg_pt_gp.
315 l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem;
316 if (!l_tg_pt_gp_mem) {
317 pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n");
318 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
321 spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
322 l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp;
324 spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
325 pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n");
326 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
329 spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
331 if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) {
332 pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
333 " while TPGS_EXPLICIT_ALUA is disabled\n");
334 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
337 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
339 ptr = &buf[4]; /* Skip over RESERVED area in header */
341 while (len < cmd->data_length) {
343 alua_access_state = (ptr[0] & 0x0f);
345 * Check the received ALUA access state, and determine if
346 * the state is a primary or secondary target port asymmetric
349 rc = core_alua_check_transition(alua_access_state,
350 valid_states, &primary);
353 * If the SET TARGET PORT GROUPS attempts to establish
354 * an invalid combination of target port asymmetric
355 * access states or attempts to establish an
356 * unsupported target port asymmetric access state,
357 * then the command shall be terminated with CHECK
358 * CONDITION status, with the sense key set to ILLEGAL
359 * REQUEST, and the additional sense code set to INVALID
360 * FIELD IN PARAMETER LIST.
366 * If the ASYMMETRIC ACCESS STATE field (see table 267)
367 * specifies a primary target port asymmetric access state,
368 * then the TARGET PORT GROUP OR TARGET PORT field specifies
369 * a primary target port group for which the primary target
370 * port asymmetric access state shall be changed. If the
371 * ASYMMETRIC ACCESS STATE field specifies a secondary target
372 * port asymmetric access state, then the TARGET PORT GROUP OR
373 * TARGET PORT field specifies the relative target port
374 * identifier (see 3.1.120) of the target port for which the
375 * secondary target port asymmetric access state shall be
379 tg_pt_id = get_unaligned_be16(ptr + 2);
381 * Locate the matching target port group ID from
382 * the global tg_pt_gp list
384 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
385 list_for_each_entry(tg_pt_gp,
386 &dev->t10_alua.tg_pt_gps_list,
388 if (!tg_pt_gp->tg_pt_gp_valid_id)
391 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id)
394 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
396 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
398 if (!core_alua_do_port_transition(tg_pt_gp,
400 alua_access_state, 1))
403 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
404 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
407 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
410 * Extract the RELATIVE TARGET PORT IDENTIFIER to identify
411 * the Target Port in question for the the incoming
412 * SET_TARGET_PORT_GROUPS op.
414 rtpi = get_unaligned_be16(ptr + 2);
416 * Locate the matching relative target port identifier
417 * for the struct se_device storage object.
419 spin_lock(&dev->se_port_lock);
420 list_for_each_entry(port, &dev->dev_sep_list,
422 if (port->sep_rtpi != rtpi)
425 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
427 spin_unlock(&dev->se_port_lock);
429 if (!core_alua_set_tg_pt_secondary_state(
430 tg_pt_gp_mem, port, 1, 1))
433 spin_lock(&dev->se_port_lock);
436 spin_unlock(&dev->se_port_lock);
440 rc = TCM_INVALID_PARAMETER_LIST;
449 transport_kunmap_data_sg(cmd);
451 target_complete_cmd(cmd, GOOD);
455 static inline void set_ascq(struct se_cmd *cmd, u8 alua_ascq)
458 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
459 * The ALUA additional sense code qualifier (ASCQ) is determined
460 * by the ALUA primary or secondary access state..
462 pr_debug("[%s]: ALUA TG Port not available, "
463 "SenseKey: NOT_READY, ASC/ASCQ: "
465 cmd->se_tfo->get_fabric_name(), alua_ascq);
467 cmd->scsi_asc = 0x04;
468 cmd->scsi_ascq = alua_ascq;
471 static inline void core_alua_state_nonoptimized(
474 int nonop_delay_msecs)
477 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
478 * later to determine if processing of this cmd needs to be
479 * temporarily delayed for the Active/NonOptimized primary access state.
481 cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
482 cmd->alua_nonop_delay = nonop_delay_msecs;
485 static inline int core_alua_state_lba_dependent(
487 struct t10_alua_tg_pt_gp *tg_pt_gp)
489 struct se_device *dev = cmd->se_dev;
490 u64 segment_size, segment_mult, sectors, lba;
492 /* Only need to check for cdb actually containing LBAs */
493 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB))
496 spin_lock(&dev->t10_alua.lba_map_lock);
497 segment_size = dev->t10_alua.lba_map_segment_size;
498 segment_mult = dev->t10_alua.lba_map_segment_multiplier;
499 sectors = cmd->data_length / dev->dev_attrib.block_size;
501 lba = cmd->t_task_lba;
502 while (lba < cmd->t_task_lba + sectors) {
503 struct t10_alua_lba_map *cur_map = NULL, *map;
504 struct t10_alua_lba_map_member *map_mem;
506 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
508 u64 start_lba, last_lba;
509 u64 first_lba = map->lba_map_first_lba;
513 start_lba = do_div(tmp, segment_size * segment_mult);
515 last_lba = first_lba + segment_size - 1;
516 if (start_lba >= first_lba &&
517 start_lba <= last_lba) {
523 last_lba = map->lba_map_last_lba;
524 if (lba >= first_lba && lba <= last_lba) {
532 spin_unlock(&dev->t10_alua.lba_map_lock);
533 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
536 list_for_each_entry(map_mem, &cur_map->lba_map_mem_list,
538 if (map_mem->lba_map_mem_alua_pg_id !=
539 tg_pt_gp->tg_pt_gp_id)
541 switch(map_mem->lba_map_mem_alua_state) {
542 case ALUA_ACCESS_STATE_STANDBY:
543 spin_unlock(&dev->t10_alua.lba_map_lock);
544 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
546 case ALUA_ACCESS_STATE_UNAVAILABLE:
547 spin_unlock(&dev->t10_alua.lba_map_lock);
548 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
555 spin_unlock(&dev->t10_alua.lba_map_lock);
559 static inline int core_alua_state_standby(
564 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
565 * spc4r17 section 5.9.2.4.4
574 case RECEIVE_DIAGNOSTIC:
575 case SEND_DIAGNOSTIC:
578 case SERVICE_ACTION_IN_16:
579 switch (cdb[1] & 0x1f) {
580 case SAI_READ_CAPACITY_16:
583 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
587 switch (cdb[1] & 0x1f) {
588 case MI_REPORT_TARGET_PGS:
591 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
594 case MAINTENANCE_OUT:
596 case MO_SET_TARGET_PGS:
599 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
603 case PERSISTENT_RESERVE_IN:
604 case PERSISTENT_RESERVE_OUT:
609 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
616 static inline int core_alua_state_unavailable(
621 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
622 * spc4r17 section 5.9.2.4.5
629 switch (cdb[1] & 0x1f) {
630 case MI_REPORT_TARGET_PGS:
633 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
636 case MAINTENANCE_OUT:
638 case MO_SET_TARGET_PGS:
641 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
649 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
656 static inline int core_alua_state_transition(
661 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by
662 * spc4r17 section 5.9.2.5
669 switch (cdb[1] & 0x1f) {
670 case MI_REPORT_TARGET_PGS:
673 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
681 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
689 * return 1: Is used to signal LUN not accessible, and check condition/not ready
690 * return 0: Used to signal success
691 * return -1: Used to signal failure, and invalid cdb field
694 target_alua_state_check(struct se_cmd *cmd)
696 struct se_device *dev = cmd->se_dev;
697 unsigned char *cdb = cmd->t_task_cdb;
698 struct se_lun *lun = cmd->se_lun;
699 struct se_port *port = lun->lun_sep;
700 struct t10_alua_tg_pt_gp *tg_pt_gp;
701 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
702 int out_alua_state, nonop_delay_msecs;
704 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
706 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
712 * First, check for a struct se_port specific secondary ALUA target port
713 * access state: OFFLINE
715 if (atomic_read(&port->sep_tg_pt_secondary_offline)) {
716 pr_debug("ALUA: Got secondary offline status for local"
718 set_ascq(cmd, ASCQ_04H_ALUA_OFFLINE);
719 return TCM_CHECK_CONDITION_NOT_READY;
722 * Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the
723 * ALUA target port group, to obtain current ALUA access state.
724 * Otherwise look for the underlying struct se_device association with
725 * a ALUA logical unit group.
727 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
731 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
732 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
733 out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
734 nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
735 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
737 * Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED in a separate conditional
738 * statement so the compiler knows explicitly to check this case first.
739 * For the Optimized ALUA access state case, we want to process the
740 * incoming fabric cmd ASAP..
742 if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED)
745 switch (out_alua_state) {
746 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
747 core_alua_state_nonoptimized(cmd, cdb, nonop_delay_msecs);
749 case ALUA_ACCESS_STATE_STANDBY:
750 if (core_alua_state_standby(cmd, cdb))
751 return TCM_CHECK_CONDITION_NOT_READY;
753 case ALUA_ACCESS_STATE_UNAVAILABLE:
754 if (core_alua_state_unavailable(cmd, cdb))
755 return TCM_CHECK_CONDITION_NOT_READY;
757 case ALUA_ACCESS_STATE_TRANSITION:
758 if (core_alua_state_transition(cmd, cdb))
759 return TCM_CHECK_CONDITION_NOT_READY;
761 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
762 if (core_alua_state_lba_dependent(cmd, tg_pt_gp))
763 return TCM_CHECK_CONDITION_NOT_READY;
766 * OFFLINE is a secondary ALUA target port group access state, that is
767 * handled above with struct se_port->sep_tg_pt_secondary_offline=1
769 case ALUA_ACCESS_STATE_OFFLINE:
771 pr_err("Unknown ALUA access state: 0x%02x\n",
773 return TCM_INVALID_CDB_FIELD;
780 * Check implicit and explicit ALUA state change request.
782 static sense_reason_t
783 core_alua_check_transition(int state, int valid, int *primary)
786 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
787 * defined as primary target port asymmetric access states.
790 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
791 if (!(valid & ALUA_AO_SUP))
795 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
796 if (!(valid & ALUA_AN_SUP))
800 case ALUA_ACCESS_STATE_STANDBY:
801 if (!(valid & ALUA_S_SUP))
805 case ALUA_ACCESS_STATE_UNAVAILABLE:
806 if (!(valid & ALUA_U_SUP))
810 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
811 if (!(valid & ALUA_LBD_SUP))
815 case ALUA_ACCESS_STATE_OFFLINE:
817 * OFFLINE state is defined as a secondary target port
818 * asymmetric access state.
820 if (!(valid & ALUA_O_SUP))
824 case ALUA_ACCESS_STATE_TRANSITION:
826 * Transitioning is set internally, and
827 * cannot be selected manually.
831 pr_err("Unknown ALUA access state: 0x%02x\n", state);
832 return TCM_INVALID_PARAMETER_LIST;
838 pr_err("ALUA access state %s not supported",
839 core_alua_dump_state(state));
840 return TCM_INVALID_PARAMETER_LIST;
843 static char *core_alua_dump_state(int state)
846 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
847 return "Active/Optimized";
848 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
849 return "Active/NonOptimized";
850 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
851 return "LBA Dependent";
852 case ALUA_ACCESS_STATE_STANDBY:
854 case ALUA_ACCESS_STATE_UNAVAILABLE:
855 return "Unavailable";
856 case ALUA_ACCESS_STATE_OFFLINE:
858 case ALUA_ACCESS_STATE_TRANSITION:
859 return "Transitioning";
867 char *core_alua_dump_status(int status)
870 case ALUA_STATUS_NONE:
872 case ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG:
873 return "Altered by Explicit STPG";
874 case ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA:
875 return "Altered by Implicit ALUA";
884 * Used by fabric modules to determine when we need to delay processing
885 * for the Active/NonOptimized paths..
887 int core_alua_check_nonop_delay(
890 if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
895 * The ALUA Active/NonOptimized access state delay can be disabled
896 * in via configfs with a value of zero
898 if (!cmd->alua_nonop_delay)
901 * struct se_cmd->alua_nonop_delay gets set by a target port group
902 * defined interval in core_alua_state_nonoptimized()
904 msleep_interruptible(cmd->alua_nonop_delay);
907 EXPORT_SYMBOL(core_alua_check_nonop_delay);
910 * Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex
913 static int core_alua_write_tpg_metadata(
915 unsigned char *md_buf,
918 struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
922 pr_err("filp_open(%s) for ALUA metadata failed\n", path);
925 ret = kernel_write(file, md_buf, md_buf_len, 0);
927 pr_err("Error writing ALUA metadata file: %s\n", path);
929 return (ret < 0) ? -EIO : 0;
933 * Called with tg_pt_gp->tg_pt_gp_md_mutex held
935 static int core_alua_update_tpg_primary_metadata(
936 struct t10_alua_tg_pt_gp *tg_pt_gp)
938 unsigned char *md_buf;
939 struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn;
940 char path[ALUA_METADATA_PATH_LEN];
943 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
945 pr_err("Unable to allocate buf for ALUA metadata\n");
949 memset(path, 0, ALUA_METADATA_PATH_LEN);
951 len = snprintf(md_buf, ALUA_MD_BUF_LEN,
953 "alua_access_state=0x%02x\n"
954 "alua_access_status=0x%02x\n",
955 tg_pt_gp->tg_pt_gp_id,
956 tg_pt_gp->tg_pt_gp_alua_pending_state,
957 tg_pt_gp->tg_pt_gp_alua_access_status);
959 snprintf(path, ALUA_METADATA_PATH_LEN,
960 "/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0],
961 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
963 rc = core_alua_write_tpg_metadata(path, md_buf, len);
968 static void core_alua_do_transition_tg_pt_work(struct work_struct *work)
970 struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(work,
971 struct t10_alua_tg_pt_gp, tg_pt_gp_transition_work.work);
972 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
973 struct se_dev_entry *se_deve;
974 struct se_lun_acl *lacl;
975 struct se_port *port;
976 struct t10_alua_tg_pt_gp_member *mem;
977 bool explicit = (tg_pt_gp->tg_pt_gp_alua_access_status ==
978 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG);
980 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
981 list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list,
985 * After an implicit target port asymmetric access state
986 * change, a device server shall establish a unit attention
987 * condition for the initiator port associated with every I_T
988 * nexus with the additional sense code set to ASYMMETRIC
989 * ACCESS STATE CHANGED.
991 * After an explicit target port asymmetric access state
992 * change, a device server shall establish a unit attention
993 * condition with the additional sense code set to ASYMMETRIC
994 * ACCESS STATE CHANGED for the initiator port associated with
995 * every I_T nexus other than the I_T nexus on which the SET
996 * TARGET PORT GROUPS command
998 atomic_inc_mb(&mem->tg_pt_gp_mem_ref_cnt);
999 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1001 spin_lock_bh(&port->sep_alua_lock);
1002 list_for_each_entry(se_deve, &port->sep_alua_list,
1004 lacl = se_deve->se_lun_acl;
1006 * se_deve->se_lun_acl pointer may be NULL for a
1007 * entry created without explicit Node+MappedLUN ACLs
1012 if ((tg_pt_gp->tg_pt_gp_alua_access_status ==
1013 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
1014 (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) &&
1015 (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl) &&
1016 (tg_pt_gp->tg_pt_gp_alua_port != NULL) &&
1017 (tg_pt_gp->tg_pt_gp_alua_port == port))
1020 core_scsi3_ua_allocate(lacl->se_lun_nacl,
1021 se_deve->mapped_lun, 0x2A,
1022 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
1024 spin_unlock_bh(&port->sep_alua_lock);
1026 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1027 atomic_dec_mb(&mem->tg_pt_gp_mem_ref_cnt);
1029 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1031 * Update the ALUA metadata buf that has been allocated in
1032 * core_alua_do_port_transition(), this metadata will be written
1035 * Note that there is the case where we do not want to update the
1036 * metadata when the saved metadata is being parsed in userspace
1037 * when setting the existing port access state and access status.
1039 * Also note that the failure to write out the ALUA metadata to
1040 * struct file does NOT affect the actual ALUA transition.
1042 if (tg_pt_gp->tg_pt_gp_write_metadata) {
1043 mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex);
1044 core_alua_update_tpg_primary_metadata(tg_pt_gp);
1045 mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex);
1048 * Set the current primary ALUA access state to the requested new state
1050 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1051 tg_pt_gp->tg_pt_gp_alua_pending_state);
1053 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1054 " from primary access state %s to %s\n", (explicit) ? "explicit" :
1055 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1056 tg_pt_gp->tg_pt_gp_id,
1057 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_previous_state),
1058 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_pending_state));
1059 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1060 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1061 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1063 if (tg_pt_gp->tg_pt_gp_transition_complete)
1064 complete(tg_pt_gp->tg_pt_gp_transition_complete);
1067 static int core_alua_do_transition_tg_pt(
1068 struct t10_alua_tg_pt_gp *tg_pt_gp,
1072 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1073 DECLARE_COMPLETION_ONSTACK(wait);
1075 /* Nothing to be done here */
1076 if (atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == new_state)
1079 if (new_state == ALUA_ACCESS_STATE_TRANSITION)
1083 * Flush any pending transitions
1085 if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs &&
1086 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) ==
1087 ALUA_ACCESS_STATE_TRANSITION) {
1089 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
1090 tg_pt_gp->tg_pt_gp_transition_complete = &wait;
1091 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);
1092 wait_for_completion(&wait);
1093 tg_pt_gp->tg_pt_gp_transition_complete = NULL;
1098 * Save the old primary ALUA access state, and set the current state
1099 * to ALUA_ACCESS_STATE_TRANSITION.
1101 tg_pt_gp->tg_pt_gp_alua_previous_state =
1102 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
1103 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
1105 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1106 ALUA_ACCESS_STATE_TRANSITION);
1107 tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ?
1108 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1109 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1112 * Check for the optional ALUA primary state transition delay
1114 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
1115 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
1118 * Take a reference for workqueue item
1120 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1121 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1122 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1124 if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs) {
1125 unsigned long transition_tmo;
1127 transition_tmo = tg_pt_gp->tg_pt_gp_implicit_trans_secs * HZ;
1128 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq,
1129 &tg_pt_gp->tg_pt_gp_transition_work,
1132 tg_pt_gp->tg_pt_gp_transition_complete = &wait;
1133 queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq,
1134 &tg_pt_gp->tg_pt_gp_transition_work, 0);
1135 wait_for_completion(&wait);
1136 tg_pt_gp->tg_pt_gp_transition_complete = NULL;
1142 int core_alua_do_port_transition(
1143 struct t10_alua_tg_pt_gp *l_tg_pt_gp,
1144 struct se_device *l_dev,
1145 struct se_port *l_port,
1146 struct se_node_acl *l_nacl,
1150 struct se_device *dev;
1151 struct t10_alua_lu_gp *lu_gp;
1152 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
1153 struct t10_alua_tg_pt_gp *tg_pt_gp;
1154 int primary, valid_states, rc = 0;
1156 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
1157 if (core_alua_check_transition(new_state, valid_states, &primary) != 0)
1160 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
1161 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
1162 lu_gp = local_lu_gp_mem->lu_gp;
1163 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1164 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
1166 * For storage objects that are members of the 'default_lu_gp',
1167 * we only do transition on the passed *l_tp_pt_gp, and not
1168 * on all of the matching target port groups IDs in default_lu_gp.
1170 if (!lu_gp->lu_gp_id) {
1172 * core_alua_do_transition_tg_pt() will always return
1175 l_tg_pt_gp->tg_pt_gp_alua_port = l_port;
1176 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1177 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp,
1178 new_state, explicit);
1179 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1183 * For all other LU groups aside from 'default_lu_gp', walk all of
1184 * the associated storage objects looking for a matching target port
1185 * group ID from the local target port group.
1187 spin_lock(&lu_gp->lu_gp_lock);
1188 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
1191 dev = lu_gp_mem->lu_gp_mem_dev;
1192 atomic_inc_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1193 spin_unlock(&lu_gp->lu_gp_lock);
1195 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1196 list_for_each_entry(tg_pt_gp,
1197 &dev->t10_alua.tg_pt_gps_list,
1200 if (!tg_pt_gp->tg_pt_gp_valid_id)
1203 * If the target behavior port asymmetric access state
1204 * is changed for any target port group accessible via
1205 * a logical unit within a LU group, the target port
1206 * behavior group asymmetric access states for the same
1207 * target port group accessible via other logical units
1208 * in that LU group will also change.
1210 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
1213 if (l_tg_pt_gp == tg_pt_gp) {
1214 tg_pt_gp->tg_pt_gp_alua_port = l_port;
1215 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1217 tg_pt_gp->tg_pt_gp_alua_port = NULL;
1218 tg_pt_gp->tg_pt_gp_alua_nacl = NULL;
1220 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1221 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1223 * core_alua_do_transition_tg_pt() will always return
1226 rc = core_alua_do_transition_tg_pt(tg_pt_gp,
1227 new_state, explicit);
1229 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1230 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1234 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1236 spin_lock(&lu_gp->lu_gp_lock);
1237 atomic_dec_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1239 spin_unlock(&lu_gp->lu_gp_lock);
1242 pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
1243 " Group IDs: %hu %s transition to primary state: %s\n",
1244 config_item_name(&lu_gp->lu_gp_group.cg_item),
1245 l_tg_pt_gp->tg_pt_gp_id,
1246 (explicit) ? "explicit" : "implicit",
1247 core_alua_dump_state(new_state));
1250 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1255 * Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held
1257 static int core_alua_update_tpg_secondary_metadata(
1258 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1259 struct se_port *port)
1261 unsigned char *md_buf;
1262 struct se_portal_group *se_tpg = port->sep_tpg;
1263 char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN];
1266 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
1268 pr_err("Unable to allocate buf for ALUA metadata\n");
1272 memset(path, 0, ALUA_METADATA_PATH_LEN);
1273 memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN);
1275 len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s",
1276 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg));
1278 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL)
1279 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu",
1280 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
1282 len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n"
1283 "alua_tg_pt_status=0x%02x\n",
1284 atomic_read(&port->sep_tg_pt_secondary_offline),
1285 port->sep_tg_pt_secondary_stat);
1287 snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u",
1288 se_tpg->se_tpg_tfo->get_fabric_name(), wwn,
1289 port->sep_lun->unpacked_lun);
1291 rc = core_alua_write_tpg_metadata(path, md_buf, len);
1297 static int core_alua_set_tg_pt_secondary_state(
1298 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1299 struct se_port *port,
1303 struct t10_alua_tg_pt_gp *tg_pt_gp;
1304 int trans_delay_msecs;
1306 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1307 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1309 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1310 pr_err("Unable to complete secondary state"
1314 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
1316 * Set the secondary ALUA target port access state to OFFLINE
1317 * or release the previously secondary state for struct se_port
1320 atomic_set(&port->sep_tg_pt_secondary_offline, 1);
1322 atomic_set(&port->sep_tg_pt_secondary_offline, 0);
1324 port->sep_tg_pt_secondary_stat = (explicit) ?
1325 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1326 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1328 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1329 " to secondary access state: %s\n", (explicit) ? "explicit" :
1330 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1331 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
1333 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1335 * Do the optional transition delay after we set the secondary
1336 * ALUA access state.
1338 if (trans_delay_msecs != 0)
1339 msleep_interruptible(trans_delay_msecs);
1341 * See if we need to update the ALUA fabric port metadata for
1342 * secondary state and status
1344 if (port->sep_tg_pt_secondary_write_md) {
1345 mutex_lock(&port->sep_tg_pt_md_mutex);
1346 core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port);
1347 mutex_unlock(&port->sep_tg_pt_md_mutex);
1353 struct t10_alua_lba_map *
1354 core_alua_allocate_lba_map(struct list_head *list,
1355 u64 first_lba, u64 last_lba)
1357 struct t10_alua_lba_map *lba_map;
1359 lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL);
1361 pr_err("Unable to allocate struct t10_alua_lba_map\n");
1362 return ERR_PTR(-ENOMEM);
1364 INIT_LIST_HEAD(&lba_map->lba_map_mem_list);
1365 lba_map->lba_map_first_lba = first_lba;
1366 lba_map->lba_map_last_lba = last_lba;
1368 list_add_tail(&lba_map->lba_map_list, list);
1373 core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map,
1374 int pg_id, int state)
1376 struct t10_alua_lba_map_member *lba_map_mem;
1378 list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list,
1380 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) {
1381 pr_err("Duplicate pg_id %d in lba_map\n", pg_id);
1386 lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL);
1388 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n");
1391 lba_map_mem->lba_map_mem_alua_state = state;
1392 lba_map_mem->lba_map_mem_alua_pg_id = pg_id;
1394 list_add_tail(&lba_map_mem->lba_map_mem_list,
1395 &lba_map->lba_map_mem_list);
1400 core_alua_free_lba_map(struct list_head *lba_list)
1402 struct t10_alua_lba_map *lba_map, *lba_map_tmp;
1403 struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp;
1405 list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list,
1407 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp,
1408 &lba_map->lba_map_mem_list,
1410 list_del(&lba_map_mem->lba_map_mem_list);
1411 kmem_cache_free(t10_alua_lba_map_mem_cache,
1414 list_del(&lba_map->lba_map_list);
1415 kmem_cache_free(t10_alua_lba_map_cache, lba_map);
1420 core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list,
1421 int segment_size, int segment_mult)
1423 struct list_head old_lba_map_list;
1424 struct t10_alua_tg_pt_gp *tg_pt_gp;
1425 int activate = 0, supported;
1427 INIT_LIST_HEAD(&old_lba_map_list);
1428 spin_lock(&dev->t10_alua.lba_map_lock);
1429 dev->t10_alua.lba_map_segment_size = segment_size;
1430 dev->t10_alua.lba_map_segment_multiplier = segment_mult;
1431 list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list);
1433 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list);
1436 spin_unlock(&dev->t10_alua.lba_map_lock);
1437 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1438 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1441 if (!tg_pt_gp->tg_pt_gp_valid_id)
1443 supported = tg_pt_gp->tg_pt_gp_alua_supported_states;
1445 supported |= ALUA_LBD_SUP;
1447 supported &= ~ALUA_LBD_SUP;
1448 tg_pt_gp->tg_pt_gp_alua_supported_states = supported;
1450 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1451 core_alua_free_lba_map(&old_lba_map_list);
1454 struct t10_alua_lu_gp *
1455 core_alua_allocate_lu_gp(const char *name, int def_group)
1457 struct t10_alua_lu_gp *lu_gp;
1459 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
1461 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1462 return ERR_PTR(-ENOMEM);
1464 INIT_LIST_HEAD(&lu_gp->lu_gp_node);
1465 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
1466 spin_lock_init(&lu_gp->lu_gp_lock);
1467 atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
1470 lu_gp->lu_gp_id = alua_lu_gps_counter++;
1471 lu_gp->lu_gp_valid_id = 1;
1472 alua_lu_gps_count++;
1478 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
1480 struct t10_alua_lu_gp *lu_gp_tmp;
1483 * The lu_gp->lu_gp_id may only be set once..
1485 if (lu_gp->lu_gp_valid_id) {
1486 pr_warn("ALUA LU Group already has a valid ID,"
1487 " ignoring request\n");
1491 spin_lock(&lu_gps_lock);
1492 if (alua_lu_gps_count == 0x0000ffff) {
1493 pr_err("Maximum ALUA alua_lu_gps_count:"
1494 " 0x0000ffff reached\n");
1495 spin_unlock(&lu_gps_lock);
1496 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1500 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
1501 alua_lu_gps_counter++;
1503 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
1504 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
1508 pr_warn("ALUA Logical Unit Group ID: %hu"
1509 " already exists, ignoring request\n",
1511 spin_unlock(&lu_gps_lock);
1516 lu_gp->lu_gp_id = lu_gp_id_tmp;
1517 lu_gp->lu_gp_valid_id = 1;
1518 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
1519 alua_lu_gps_count++;
1520 spin_unlock(&lu_gps_lock);
1525 static struct t10_alua_lu_gp_member *
1526 core_alua_allocate_lu_gp_mem(struct se_device *dev)
1528 struct t10_alua_lu_gp_member *lu_gp_mem;
1530 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
1532 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1533 return ERR_PTR(-ENOMEM);
1535 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
1536 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
1537 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
1539 lu_gp_mem->lu_gp_mem_dev = dev;
1540 dev->dev_alua_lu_gp_mem = lu_gp_mem;
1545 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
1547 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
1549 * Once we have reached this point, config_item_put() has
1550 * already been called from target_core_alua_drop_lu_gp().
1552 * Here, we remove the *lu_gp from the global list so that
1553 * no associations can be made while we are releasing
1554 * struct t10_alua_lu_gp.
1556 spin_lock(&lu_gps_lock);
1557 list_del(&lu_gp->lu_gp_node);
1558 alua_lu_gps_count--;
1559 spin_unlock(&lu_gps_lock);
1561 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1562 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1563 * released with core_alua_put_lu_gp_from_name()
1565 while (atomic_read(&lu_gp->lu_gp_ref_cnt))
1568 * Release reference to struct t10_alua_lu_gp * from all associated
1571 spin_lock(&lu_gp->lu_gp_lock);
1572 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
1573 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
1574 if (lu_gp_mem->lu_gp_assoc) {
1575 list_del(&lu_gp_mem->lu_gp_mem_list);
1576 lu_gp->lu_gp_members--;
1577 lu_gp_mem->lu_gp_assoc = 0;
1579 spin_unlock(&lu_gp->lu_gp_lock);
1582 * lu_gp_mem is associated with a single
1583 * struct se_device->dev_alua_lu_gp_mem, and is released when
1584 * struct se_device is released via core_alua_free_lu_gp_mem().
1586 * If the passed lu_gp does NOT match the default_lu_gp, assume
1587 * we want to re-associate a given lu_gp_mem with default_lu_gp.
1589 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1590 if (lu_gp != default_lu_gp)
1591 __core_alua_attach_lu_gp_mem(lu_gp_mem,
1594 lu_gp_mem->lu_gp = NULL;
1595 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1597 spin_lock(&lu_gp->lu_gp_lock);
1599 spin_unlock(&lu_gp->lu_gp_lock);
1601 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1604 void core_alua_free_lu_gp_mem(struct se_device *dev)
1606 struct t10_alua_lu_gp *lu_gp;
1607 struct t10_alua_lu_gp_member *lu_gp_mem;
1609 lu_gp_mem = dev->dev_alua_lu_gp_mem;
1613 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
1616 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1617 lu_gp = lu_gp_mem->lu_gp;
1619 spin_lock(&lu_gp->lu_gp_lock);
1620 if (lu_gp_mem->lu_gp_assoc) {
1621 list_del(&lu_gp_mem->lu_gp_mem_list);
1622 lu_gp->lu_gp_members--;
1623 lu_gp_mem->lu_gp_assoc = 0;
1625 spin_unlock(&lu_gp->lu_gp_lock);
1626 lu_gp_mem->lu_gp = NULL;
1628 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1630 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
1633 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
1635 struct t10_alua_lu_gp *lu_gp;
1636 struct config_item *ci;
1638 spin_lock(&lu_gps_lock);
1639 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
1640 if (!lu_gp->lu_gp_valid_id)
1642 ci = &lu_gp->lu_gp_group.cg_item;
1643 if (!strcmp(config_item_name(ci), name)) {
1644 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1645 spin_unlock(&lu_gps_lock);
1649 spin_unlock(&lu_gps_lock);
1654 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
1656 spin_lock(&lu_gps_lock);
1657 atomic_dec(&lu_gp->lu_gp_ref_cnt);
1658 spin_unlock(&lu_gps_lock);
1662 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1664 void __core_alua_attach_lu_gp_mem(
1665 struct t10_alua_lu_gp_member *lu_gp_mem,
1666 struct t10_alua_lu_gp *lu_gp)
1668 spin_lock(&lu_gp->lu_gp_lock);
1669 lu_gp_mem->lu_gp = lu_gp;
1670 lu_gp_mem->lu_gp_assoc = 1;
1671 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
1672 lu_gp->lu_gp_members++;
1673 spin_unlock(&lu_gp->lu_gp_lock);
1677 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1679 void __core_alua_drop_lu_gp_mem(
1680 struct t10_alua_lu_gp_member *lu_gp_mem,
1681 struct t10_alua_lu_gp *lu_gp)
1683 spin_lock(&lu_gp->lu_gp_lock);
1684 list_del(&lu_gp_mem->lu_gp_mem_list);
1685 lu_gp_mem->lu_gp = NULL;
1686 lu_gp_mem->lu_gp_assoc = 0;
1687 lu_gp->lu_gp_members--;
1688 spin_unlock(&lu_gp->lu_gp_lock);
1691 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
1692 const char *name, int def_group)
1694 struct t10_alua_tg_pt_gp *tg_pt_gp;
1696 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
1698 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1701 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
1702 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_mem_list);
1703 mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex);
1704 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
1705 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
1706 INIT_DELAYED_WORK(&tg_pt_gp->tg_pt_gp_transition_work,
1707 core_alua_do_transition_tg_pt_work);
1708 tg_pt_gp->tg_pt_gp_dev = dev;
1709 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1710 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED);
1712 * Enable both explicit and implicit ALUA support by default
1714 tg_pt_gp->tg_pt_gp_alua_access_type =
1715 TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA;
1717 * Set the default Active/NonOptimized Delay in milliseconds
1719 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
1720 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
1721 tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS;
1724 * Enable all supported states
1726 tg_pt_gp->tg_pt_gp_alua_supported_states =
1727 ALUA_T_SUP | ALUA_O_SUP |
1728 ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP;
1731 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1732 tg_pt_gp->tg_pt_gp_id =
1733 dev->t10_alua.alua_tg_pt_gps_counter++;
1734 tg_pt_gp->tg_pt_gp_valid_id = 1;
1735 dev->t10_alua.alua_tg_pt_gps_count++;
1736 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1737 &dev->t10_alua.tg_pt_gps_list);
1738 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1744 int core_alua_set_tg_pt_gp_id(
1745 struct t10_alua_tg_pt_gp *tg_pt_gp,
1748 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1749 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
1750 u16 tg_pt_gp_id_tmp;
1753 * The tg_pt_gp->tg_pt_gp_id may only be set once..
1755 if (tg_pt_gp->tg_pt_gp_valid_id) {
1756 pr_warn("ALUA TG PT Group already has a valid ID,"
1757 " ignoring request\n");
1761 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1762 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
1763 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1764 " 0x0000ffff reached\n");
1765 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1766 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1770 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
1771 dev->t10_alua.alua_tg_pt_gps_counter++;
1773 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list,
1775 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
1779 pr_err("ALUA Target Port Group ID: %hu already"
1780 " exists, ignoring request\n", tg_pt_gp_id);
1781 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1786 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
1787 tg_pt_gp->tg_pt_gp_valid_id = 1;
1788 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1789 &dev->t10_alua.tg_pt_gps_list);
1790 dev->t10_alua.alua_tg_pt_gps_count++;
1791 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1796 struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem(
1797 struct se_port *port)
1799 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1801 tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache,
1803 if (!tg_pt_gp_mem) {
1804 pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n");
1805 return ERR_PTR(-ENOMEM);
1807 INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1808 spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1809 atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0);
1811 tg_pt_gp_mem->tg_pt = port;
1812 port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem;
1814 return tg_pt_gp_mem;
1817 void core_alua_free_tg_pt_gp(
1818 struct t10_alua_tg_pt_gp *tg_pt_gp)
1820 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1821 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp;
1824 * Once we have reached this point, config_item_put() has already
1825 * been called from target_core_alua_drop_tg_pt_gp().
1827 * Here we remove *tg_pt_gp from the global list so that
1828 * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS
1829 * can be made while we are releasing struct t10_alua_tg_pt_gp.
1831 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1832 list_del(&tg_pt_gp->tg_pt_gp_list);
1833 dev->t10_alua.alua_tg_pt_gps_counter--;
1834 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1836 flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);
1839 * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1840 * core_alua_get_tg_pt_gp_by_name() in
1841 * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1842 * to be released with core_alua_put_tg_pt_gp_from_name().
1844 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
1848 * Release reference to struct t10_alua_tg_pt_gp from all associated
1851 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1852 list_for_each_entry_safe(tg_pt_gp_mem, tg_pt_gp_mem_tmp,
1853 &tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) {
1854 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1855 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1856 tg_pt_gp->tg_pt_gp_members--;
1857 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1859 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1861 * tg_pt_gp_mem is associated with a single
1862 * se_port->sep_alua_tg_pt_gp_mem, and is released via
1863 * core_alua_free_tg_pt_gp_mem().
1865 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1866 * assume we want to re-associate a given tg_pt_gp_mem with
1869 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1870 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
1871 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
1872 dev->t10_alua.default_tg_pt_gp);
1874 tg_pt_gp_mem->tg_pt_gp = NULL;
1875 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1877 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1879 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1881 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1884 void core_alua_free_tg_pt_gp_mem(struct se_port *port)
1886 struct t10_alua_tg_pt_gp *tg_pt_gp;
1887 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1889 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1893 while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt))
1896 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1897 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1899 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1900 if (tg_pt_gp_mem->tg_pt_gp_assoc) {
1901 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1902 tg_pt_gp->tg_pt_gp_members--;
1903 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1905 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1906 tg_pt_gp_mem->tg_pt_gp = NULL;
1908 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1910 kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem);
1913 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
1914 struct se_device *dev, const char *name)
1916 struct t10_alua_tg_pt_gp *tg_pt_gp;
1917 struct config_item *ci;
1919 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1920 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1922 if (!tg_pt_gp->tg_pt_gp_valid_id)
1924 ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1925 if (!strcmp(config_item_name(ci), name)) {
1926 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1927 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1931 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1936 static void core_alua_put_tg_pt_gp_from_name(
1937 struct t10_alua_tg_pt_gp *tg_pt_gp)
1939 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1941 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1942 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1943 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1947 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1949 void __core_alua_attach_tg_pt_gp_mem(
1950 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1951 struct t10_alua_tg_pt_gp *tg_pt_gp)
1953 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1954 tg_pt_gp_mem->tg_pt_gp = tg_pt_gp;
1955 tg_pt_gp_mem->tg_pt_gp_assoc = 1;
1956 list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list,
1957 &tg_pt_gp->tg_pt_gp_mem_list);
1958 tg_pt_gp->tg_pt_gp_members++;
1959 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1963 * Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
1965 static void __core_alua_drop_tg_pt_gp_mem(
1966 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
1967 struct t10_alua_tg_pt_gp *tg_pt_gp)
1969 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1970 list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
1971 tg_pt_gp_mem->tg_pt_gp = NULL;
1972 tg_pt_gp_mem->tg_pt_gp_assoc = 0;
1973 tg_pt_gp->tg_pt_gp_members--;
1974 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1977 ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page)
1979 struct config_item *tg_pt_ci;
1980 struct t10_alua_tg_pt_gp *tg_pt_gp;
1981 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
1984 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
1988 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
1989 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
1991 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1992 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
1993 " %hu\nTG Port Primary Access State: %s\nTG Port "
1994 "Primary Access Status: %s\nTG Port Secondary Access"
1995 " State: %s\nTG Port Secondary Access Status: %s\n",
1996 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
1997 core_alua_dump_state(atomic_read(
1998 &tg_pt_gp->tg_pt_gp_alua_access_state)),
1999 core_alua_dump_status(
2000 tg_pt_gp->tg_pt_gp_alua_access_status),
2001 (atomic_read(&port->sep_tg_pt_secondary_offline)) ?
2003 core_alua_dump_status(port->sep_tg_pt_secondary_stat));
2005 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2010 ssize_t core_alua_store_tg_pt_gp_info(
2011 struct se_port *port,
2015 struct se_portal_group *tpg;
2017 struct se_device *dev = port->sep_lun->lun_se_dev;
2018 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
2019 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
2020 unsigned char buf[TG_PT_GROUP_NAME_BUF];
2023 tpg = port->sep_tpg;
2024 lun = port->sep_lun;
2026 tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
2030 if (count > TG_PT_GROUP_NAME_BUF) {
2031 pr_err("ALUA Target Port Group alias too large!\n");
2034 memset(buf, 0, TG_PT_GROUP_NAME_BUF);
2035 memcpy(buf, page, count);
2037 * Any ALUA target port group alias besides "NULL" means we will be
2038 * making a new group association.
2040 if (strcmp(strstrip(buf), "NULL")) {
2042 * core_alua_get_tg_pt_gp_by_name() will increment reference to
2043 * struct t10_alua_tg_pt_gp. This reference is released with
2044 * core_alua_put_tg_pt_gp_from_name() below.
2046 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev,
2052 spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2053 tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
2056 * Clearing an existing tg_pt_gp association, and replacing
2057 * with the default_tg_pt_gp.
2059 if (!tg_pt_gp_new) {
2060 pr_debug("Target_Core_ConfigFS: Moving"
2061 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
2062 " alua/%s, ID: %hu back to"
2063 " default_tg_pt_gp\n",
2064 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2065 tpg->se_tpg_tfo->tpg_get_tag(tpg),
2066 config_item_name(&lun->lun_group.cg_item),
2068 &tg_pt_gp->tg_pt_gp_group.cg_item),
2069 tg_pt_gp->tg_pt_gp_id);
2071 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
2072 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
2073 dev->t10_alua.default_tg_pt_gp);
2074 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2079 * Removing existing association of tg_pt_gp_mem with tg_pt_gp
2081 __core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
2085 * Associate tg_pt_gp_mem with tg_pt_gp_new.
2087 __core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new);
2088 spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
2089 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
2090 " Target Port Group: alua/%s, ID: %hu\n", (move) ?
2091 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2092 tpg->se_tpg_tfo->tpg_get_tag(tpg),
2093 config_item_name(&lun->lun_group.cg_item),
2094 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
2095 tg_pt_gp_new->tg_pt_gp_id);
2097 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
2101 ssize_t core_alua_show_access_type(
2102 struct t10_alua_tg_pt_gp *tg_pt_gp,
2105 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) &&
2106 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA))
2107 return sprintf(page, "Implicit and Explicit\n");
2108 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)
2109 return sprintf(page, "Implicit\n");
2110 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)
2111 return sprintf(page, "Explicit\n");
2113 return sprintf(page, "None\n");
2116 ssize_t core_alua_store_access_type(
2117 struct t10_alua_tg_pt_gp *tg_pt_gp,
2124 ret = kstrtoul(page, 0, &tmp);
2126 pr_err("Unable to extract alua_access_type\n");
2129 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
2130 pr_err("Illegal value for alua_access_type:"
2135 tg_pt_gp->tg_pt_gp_alua_access_type =
2136 TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA;
2138 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA;
2140 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA;
2142 tg_pt_gp->tg_pt_gp_alua_access_type = 0;
2147 ssize_t core_alua_show_nonop_delay_msecs(
2148 struct t10_alua_tg_pt_gp *tg_pt_gp,
2151 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
2154 ssize_t core_alua_store_nonop_delay_msecs(
2155 struct t10_alua_tg_pt_gp *tg_pt_gp,
2162 ret = kstrtoul(page, 0, &tmp);
2164 pr_err("Unable to extract nonop_delay_msecs\n");
2167 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
2168 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
2169 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
2170 ALUA_MAX_NONOP_DELAY_MSECS);
2173 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
2178 ssize_t core_alua_show_trans_delay_msecs(
2179 struct t10_alua_tg_pt_gp *tg_pt_gp,
2182 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
2185 ssize_t core_alua_store_trans_delay_msecs(
2186 struct t10_alua_tg_pt_gp *tg_pt_gp,
2193 ret = kstrtoul(page, 0, &tmp);
2195 pr_err("Unable to extract trans_delay_msecs\n");
2198 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
2199 pr_err("Passed trans_delay_msecs: %lu, exceeds"
2200 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
2201 ALUA_MAX_TRANS_DELAY_MSECS);
2204 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
2209 ssize_t core_alua_show_implicit_trans_secs(
2210 struct t10_alua_tg_pt_gp *tg_pt_gp,
2213 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs);
2216 ssize_t core_alua_store_implicit_trans_secs(
2217 struct t10_alua_tg_pt_gp *tg_pt_gp,
2224 ret = kstrtoul(page, 0, &tmp);
2226 pr_err("Unable to extract implicit_trans_secs\n");
2229 if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) {
2230 pr_err("Passed implicit_trans_secs: %lu, exceeds"
2231 " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp,
2232 ALUA_MAX_IMPLICIT_TRANS_SECS);
2235 tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp;
2240 ssize_t core_alua_show_preferred_bit(
2241 struct t10_alua_tg_pt_gp *tg_pt_gp,
2244 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
2247 ssize_t core_alua_store_preferred_bit(
2248 struct t10_alua_tg_pt_gp *tg_pt_gp,
2255 ret = kstrtoul(page, 0, &tmp);
2257 pr_err("Unable to extract preferred ALUA value\n");
2260 if ((tmp != 0) && (tmp != 1)) {
2261 pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
2264 tg_pt_gp->tg_pt_gp_pref = (int)tmp;
2269 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
2274 return sprintf(page, "%d\n",
2275 atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline));
2278 ssize_t core_alua_store_offline_bit(
2283 struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
2290 ret = kstrtoul(page, 0, &tmp);
2292 pr_err("Unable to extract alua_tg_pt_offline value\n");
2295 if ((tmp != 0) && (tmp != 1)) {
2296 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
2300 tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem;
2301 if (!tg_pt_gp_mem) {
2302 pr_err("Unable to locate *tg_pt_gp_mem\n");
2306 ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem,
2307 lun->lun_sep, 0, (int)tmp);
2314 ssize_t core_alua_show_secondary_status(
2318 return sprintf(page, "%d\n", lun->lun_sep->sep_tg_pt_secondary_stat);
2321 ssize_t core_alua_store_secondary_status(
2329 ret = kstrtoul(page, 0, &tmp);
2331 pr_err("Unable to extract alua_tg_pt_status\n");
2334 if ((tmp != ALUA_STATUS_NONE) &&
2335 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
2336 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2337 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
2341 lun->lun_sep->sep_tg_pt_secondary_stat = (int)tmp;
2346 ssize_t core_alua_show_secondary_write_metadata(
2350 return sprintf(page, "%d\n",
2351 lun->lun_sep->sep_tg_pt_secondary_write_md);
2354 ssize_t core_alua_store_secondary_write_metadata(
2362 ret = kstrtoul(page, 0, &tmp);
2364 pr_err("Unable to extract alua_tg_pt_write_md\n");
2367 if ((tmp != 0) && (tmp != 1)) {
2368 pr_err("Illegal value for alua_tg_pt_write_md:"
2372 lun->lun_sep->sep_tg_pt_secondary_write_md = (int)tmp;
2377 int core_setup_alua(struct se_device *dev)
2379 if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) &&
2380 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
2381 struct t10_alua_lu_gp_member *lu_gp_mem;
2384 * Associate this struct se_device with the default ALUA
2387 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
2388 if (IS_ERR(lu_gp_mem))
2389 return PTR_ERR(lu_gp_mem);
2391 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2392 __core_alua_attach_lu_gp_mem(lu_gp_mem,
2394 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2396 pr_debug("%s: Adding to default ALUA LU Group:"
2397 " core/alua/lu_gps/default_lu_gp\n",
2398 dev->transport->name);