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>
38 #include "target_core_internal.h"
39 #include "target_core_alua.h"
40 #include "target_core_ua.h"
42 static sense_reason_t core_alua_check_transition(int state, int valid,
44 static int core_alua_set_tg_pt_secondary_state(
45 struct se_lun *lun, int explicit, int offline);
47 static char *core_alua_dump_state(int state);
49 static void __target_attach_tg_pt_gp(struct se_lun *lun,
50 struct t10_alua_tg_pt_gp *tg_pt_gp);
52 static u16 alua_lu_gps_counter;
53 static u32 alua_lu_gps_count;
55 static DEFINE_SPINLOCK(lu_gps_lock);
56 static LIST_HEAD(lu_gps_list);
58 struct t10_alua_lu_gp *default_lu_gp;
63 * See sbc3r35 section 5.23
66 target_emulate_report_referrals(struct se_cmd *cmd)
68 struct se_device *dev = cmd->se_dev;
69 struct t10_alua_lba_map *map;
70 struct t10_alua_lba_map_member *map_mem;
74 if (cmd->data_length < 4) {
75 pr_warn("REPORT REFERRALS allocation length %u too"
76 " small\n", cmd->data_length);
77 return TCM_INVALID_CDB_FIELD;
80 buf = transport_kmap_data_sg(cmd);
82 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
85 spin_lock(&dev->t10_alua.lba_map_lock);
86 if (list_empty(&dev->t10_alua.lba_map_list)) {
87 spin_unlock(&dev->t10_alua.lba_map_lock);
88 transport_kunmap_data_sg(cmd);
90 return TCM_UNSUPPORTED_SCSI_OPCODE;
93 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
95 int desc_num = off + 3;
99 if (cmd->data_length > off)
100 put_unaligned_be64(map->lba_map_first_lba, &buf[off]);
102 if (cmd->data_length > off)
103 put_unaligned_be64(map->lba_map_last_lba, &buf[off]);
107 list_for_each_entry(map_mem, &map->lba_map_mem_list,
109 int alua_state = map_mem->lba_map_mem_alua_state;
110 int alua_pg_id = map_mem->lba_map_mem_alua_pg_id;
112 if (cmd->data_length > off)
113 buf[off] = alua_state & 0x0f;
115 if (cmd->data_length > off)
116 buf[off] = (alua_pg_id >> 8) & 0xff;
118 if (cmd->data_length > off)
119 buf[off] = (alua_pg_id & 0xff);
124 if (cmd->data_length > desc_num)
125 buf[desc_num] = pg_num;
127 spin_unlock(&dev->t10_alua.lba_map_lock);
130 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
132 put_unaligned_be16(rd_len, &buf[2]);
134 transport_kunmap_data_sg(cmd);
136 target_complete_cmd(cmd, GOOD);
141 * REPORT_TARGET_PORT_GROUPS
143 * See spc4r17 section 6.27
146 target_emulate_report_target_port_groups(struct se_cmd *cmd)
148 struct se_device *dev = cmd->se_dev;
149 struct t10_alua_tg_pt_gp *tg_pt_gp;
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(lun, &tg_pt_gp->tg_pt_gp_lun_list,
228 * Start Target Port descriptor format
230 * See spc4r17 section 6.2.7 Table 247
232 off += 2; /* Skip over Obsolete */
234 * Set RELATIVE TARGET PORT IDENTIFIER
236 buf[off++] = ((lun->lun_rtpi >> 8) & 0xff);
237 buf[off++] = (lun->lun_rtpi & 0xff);
240 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
242 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
244 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
246 put_unaligned_be32(rd_len, &buf[0]);
249 * Fill in the Extended header parameter data format if requested
254 * Set the implicit transition time (in seconds) for the application
255 * client to use as a base for it's transition timeout value.
257 * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN
258 * this CDB was received upon to determine this value individually
259 * for ALUA target port group.
261 spin_lock(&cmd->se_lun->lun_tg_pt_gp_lock);
262 tg_pt_gp = cmd->se_lun->lun_tg_pt_gp;
264 buf[5] = tg_pt_gp->tg_pt_gp_implicit_trans_secs;
265 spin_unlock(&cmd->se_lun->lun_tg_pt_gp_lock);
267 transport_kunmap_data_sg(cmd);
269 target_complete_cmd(cmd, GOOD);
274 * SET_TARGET_PORT_GROUPS for explicit ALUA operation.
276 * See spc4r17 section 6.35
279 target_emulate_set_target_port_groups(struct se_cmd *cmd)
281 struct se_device *dev = cmd->se_dev;
282 struct se_lun *l_lun = cmd->se_lun;
283 struct se_node_acl *nacl = cmd->se_sess->se_node_acl;
284 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp;
287 sense_reason_t rc = TCM_NO_SENSE;
288 u32 len = 4; /* Skip over RESERVED area in header */
289 int alua_access_state, primary = 0, valid_states;
292 if (cmd->data_length < 4) {
293 pr_warn("SET TARGET PORT GROUPS parameter list length %u too"
294 " small\n", cmd->data_length);
295 return TCM_INVALID_PARAMETER_LIST;
298 buf = transport_kmap_data_sg(cmd);
300 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
303 * Determine if explicit ALUA via SET_TARGET_PORT_GROUPS is allowed
304 * for the local tg_pt_gp.
306 spin_lock(&l_lun->lun_tg_pt_gp_lock);
307 l_tg_pt_gp = l_lun->lun_tg_pt_gp;
309 spin_unlock(&l_lun->lun_tg_pt_gp_lock);
310 pr_err("Unable to access l_lun->tg_pt_gp\n");
311 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
315 if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) {
316 spin_unlock(&l_lun->lun_tg_pt_gp_lock);
317 pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
318 " while TPGS_EXPLICIT_ALUA is disabled\n");
319 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
322 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
323 spin_unlock(&l_lun->lun_tg_pt_gp_lock);
325 ptr = &buf[4]; /* Skip over RESERVED area in header */
327 while (len < cmd->data_length) {
329 alua_access_state = (ptr[0] & 0x0f);
331 * Check the received ALUA access state, and determine if
332 * the state is a primary or secondary target port asymmetric
335 rc = core_alua_check_transition(alua_access_state,
336 valid_states, &primary);
339 * If the SET TARGET PORT GROUPS attempts to establish
340 * an invalid combination of target port asymmetric
341 * access states or attempts to establish an
342 * unsupported target port asymmetric access state,
343 * then the command shall be terminated with CHECK
344 * CONDITION status, with the sense key set to ILLEGAL
345 * REQUEST, and the additional sense code set to INVALID
346 * FIELD IN PARAMETER LIST.
352 * If the ASYMMETRIC ACCESS STATE field (see table 267)
353 * specifies a primary target port asymmetric access state,
354 * then the TARGET PORT GROUP OR TARGET PORT field specifies
355 * a primary target port group for which the primary target
356 * port asymmetric access state shall be changed. If the
357 * ASYMMETRIC ACCESS STATE field specifies a secondary target
358 * port asymmetric access state, then the TARGET PORT GROUP OR
359 * TARGET PORT field specifies the relative target port
360 * identifier (see 3.1.120) of the target port for which the
361 * secondary target port asymmetric access state shall be
365 tg_pt_id = get_unaligned_be16(ptr + 2);
367 * Locate the matching target port group ID from
368 * the global tg_pt_gp list
370 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
371 list_for_each_entry(tg_pt_gp,
372 &dev->t10_alua.tg_pt_gps_list,
374 if (!tg_pt_gp->tg_pt_gp_valid_id)
377 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id)
380 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
382 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
384 if (!core_alua_do_port_transition(tg_pt_gp,
386 alua_access_state, 1))
389 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
390 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
393 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
398 * Extract the RELATIVE TARGET PORT IDENTIFIER to identify
399 * the Target Port in question for the the incoming
400 * SET_TARGET_PORT_GROUPS op.
402 rtpi = get_unaligned_be16(ptr + 2);
404 * Locate the matching relative target port identifier
405 * for the struct se_device storage object.
407 spin_lock(&dev->se_port_lock);
408 list_for_each_entry(lun, &dev->dev_sep_list,
410 if (lun->lun_rtpi != rtpi)
414 spin_unlock(&dev->se_port_lock);
416 if (!core_alua_set_tg_pt_secondary_state(
420 spin_lock(&dev->se_port_lock);
423 spin_unlock(&dev->se_port_lock);
427 rc = TCM_INVALID_PARAMETER_LIST;
436 transport_kunmap_data_sg(cmd);
438 target_complete_cmd(cmd, GOOD);
442 static inline void set_ascq(struct se_cmd *cmd, u8 alua_ascq)
445 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
446 * The ALUA additional sense code qualifier (ASCQ) is determined
447 * by the ALUA primary or secondary access state..
449 pr_debug("[%s]: ALUA TG Port not available, "
450 "SenseKey: NOT_READY, ASC/ASCQ: "
452 cmd->se_tfo->get_fabric_name(), alua_ascq);
454 cmd->scsi_asc = 0x04;
455 cmd->scsi_ascq = alua_ascq;
458 static inline void core_alua_state_nonoptimized(
461 int nonop_delay_msecs)
464 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
465 * later to determine if processing of this cmd needs to be
466 * temporarily delayed for the Active/NonOptimized primary access state.
468 cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
469 cmd->alua_nonop_delay = nonop_delay_msecs;
472 static inline int core_alua_state_lba_dependent(
474 struct t10_alua_tg_pt_gp *tg_pt_gp)
476 struct se_device *dev = cmd->se_dev;
477 u64 segment_size, segment_mult, sectors, lba;
479 /* Only need to check for cdb actually containing LBAs */
480 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB))
483 spin_lock(&dev->t10_alua.lba_map_lock);
484 segment_size = dev->t10_alua.lba_map_segment_size;
485 segment_mult = dev->t10_alua.lba_map_segment_multiplier;
486 sectors = cmd->data_length / dev->dev_attrib.block_size;
488 lba = cmd->t_task_lba;
489 while (lba < cmd->t_task_lba + sectors) {
490 struct t10_alua_lba_map *cur_map = NULL, *map;
491 struct t10_alua_lba_map_member *map_mem;
493 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
495 u64 start_lba, last_lba;
496 u64 first_lba = map->lba_map_first_lba;
500 start_lba = do_div(tmp, segment_size * segment_mult);
502 last_lba = first_lba + segment_size - 1;
503 if (start_lba >= first_lba &&
504 start_lba <= last_lba) {
510 last_lba = map->lba_map_last_lba;
511 if (lba >= first_lba && lba <= last_lba) {
519 spin_unlock(&dev->t10_alua.lba_map_lock);
520 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
523 list_for_each_entry(map_mem, &cur_map->lba_map_mem_list,
525 if (map_mem->lba_map_mem_alua_pg_id !=
526 tg_pt_gp->tg_pt_gp_id)
528 switch(map_mem->lba_map_mem_alua_state) {
529 case ALUA_ACCESS_STATE_STANDBY:
530 spin_unlock(&dev->t10_alua.lba_map_lock);
531 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
533 case ALUA_ACCESS_STATE_UNAVAILABLE:
534 spin_unlock(&dev->t10_alua.lba_map_lock);
535 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
542 spin_unlock(&dev->t10_alua.lba_map_lock);
546 static inline int core_alua_state_standby(
551 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
552 * spc4r17 section 5.9.2.4.4
561 case RECEIVE_DIAGNOSTIC:
562 case SEND_DIAGNOSTIC:
565 case SERVICE_ACTION_IN_16:
566 switch (cdb[1] & 0x1f) {
567 case SAI_READ_CAPACITY_16:
570 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
574 switch (cdb[1] & 0x1f) {
575 case MI_REPORT_TARGET_PGS:
578 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
581 case MAINTENANCE_OUT:
583 case MO_SET_TARGET_PGS:
586 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
590 case PERSISTENT_RESERVE_IN:
591 case PERSISTENT_RESERVE_OUT:
596 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
603 static inline int core_alua_state_unavailable(
608 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
609 * spc4r17 section 5.9.2.4.5
616 switch (cdb[1] & 0x1f) {
617 case MI_REPORT_TARGET_PGS:
620 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
623 case MAINTENANCE_OUT:
625 case MO_SET_TARGET_PGS:
628 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
636 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
643 static inline int core_alua_state_transition(
648 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by
649 * spc4r17 section 5.9.2.5
656 switch (cdb[1] & 0x1f) {
657 case MI_REPORT_TARGET_PGS:
660 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
668 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
676 * return 1: Is used to signal LUN not accessible, and check condition/not ready
677 * return 0: Used to signal success
678 * return -1: Used to signal failure, and invalid cdb field
681 target_alua_state_check(struct se_cmd *cmd)
683 struct se_device *dev = cmd->se_dev;
684 unsigned char *cdb = cmd->t_task_cdb;
685 struct se_lun *lun = cmd->se_lun;
686 struct t10_alua_tg_pt_gp *tg_pt_gp;
687 int out_alua_state, nonop_delay_msecs;
689 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
691 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
695 * First, check for a struct se_port specific secondary ALUA target port
696 * access state: OFFLINE
698 if (atomic_read(&lun->lun_tg_pt_secondary_offline)) {
699 pr_debug("ALUA: Got secondary offline status for local"
701 set_ascq(cmd, ASCQ_04H_ALUA_OFFLINE);
702 return TCM_CHECK_CONDITION_NOT_READY;
705 if (!lun->lun_tg_pt_gp)
708 spin_lock(&lun->lun_tg_pt_gp_lock);
709 tg_pt_gp = lun->lun_tg_pt_gp;
710 out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
711 nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
713 // XXX: keeps using tg_pt_gp witout reference after unlock
714 spin_unlock(&lun->lun_tg_pt_gp_lock);
716 * Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED in a separate conditional
717 * statement so the compiler knows explicitly to check this case first.
718 * For the Optimized ALUA access state case, we want to process the
719 * incoming fabric cmd ASAP..
721 if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED)
724 switch (out_alua_state) {
725 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
726 core_alua_state_nonoptimized(cmd, cdb, nonop_delay_msecs);
728 case ALUA_ACCESS_STATE_STANDBY:
729 if (core_alua_state_standby(cmd, cdb))
730 return TCM_CHECK_CONDITION_NOT_READY;
732 case ALUA_ACCESS_STATE_UNAVAILABLE:
733 if (core_alua_state_unavailable(cmd, cdb))
734 return TCM_CHECK_CONDITION_NOT_READY;
736 case ALUA_ACCESS_STATE_TRANSITION:
737 if (core_alua_state_transition(cmd, cdb))
738 return TCM_CHECK_CONDITION_NOT_READY;
740 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
741 if (core_alua_state_lba_dependent(cmd, tg_pt_gp))
742 return TCM_CHECK_CONDITION_NOT_READY;
745 * OFFLINE is a secondary ALUA target port group access state, that is
746 * handled above with struct se_lun->lun_tg_pt_secondary_offline=1
748 case ALUA_ACCESS_STATE_OFFLINE:
750 pr_err("Unknown ALUA access state: 0x%02x\n",
752 return TCM_INVALID_CDB_FIELD;
759 * Check implicit and explicit ALUA state change request.
761 static sense_reason_t
762 core_alua_check_transition(int state, int valid, int *primary)
765 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
766 * defined as primary target port asymmetric access states.
769 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
770 if (!(valid & ALUA_AO_SUP))
774 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
775 if (!(valid & ALUA_AN_SUP))
779 case ALUA_ACCESS_STATE_STANDBY:
780 if (!(valid & ALUA_S_SUP))
784 case ALUA_ACCESS_STATE_UNAVAILABLE:
785 if (!(valid & ALUA_U_SUP))
789 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
790 if (!(valid & ALUA_LBD_SUP))
794 case ALUA_ACCESS_STATE_OFFLINE:
796 * OFFLINE state is defined as a secondary target port
797 * asymmetric access state.
799 if (!(valid & ALUA_O_SUP))
803 case ALUA_ACCESS_STATE_TRANSITION:
805 * Transitioning is set internally, and
806 * cannot be selected manually.
810 pr_err("Unknown ALUA access state: 0x%02x\n", state);
811 return TCM_INVALID_PARAMETER_LIST;
817 pr_err("ALUA access state %s not supported",
818 core_alua_dump_state(state));
819 return TCM_INVALID_PARAMETER_LIST;
822 static char *core_alua_dump_state(int state)
825 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
826 return "Active/Optimized";
827 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
828 return "Active/NonOptimized";
829 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
830 return "LBA Dependent";
831 case ALUA_ACCESS_STATE_STANDBY:
833 case ALUA_ACCESS_STATE_UNAVAILABLE:
834 return "Unavailable";
835 case ALUA_ACCESS_STATE_OFFLINE:
837 case ALUA_ACCESS_STATE_TRANSITION:
838 return "Transitioning";
846 char *core_alua_dump_status(int status)
849 case ALUA_STATUS_NONE:
851 case ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG:
852 return "Altered by Explicit STPG";
853 case ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA:
854 return "Altered by Implicit ALUA";
863 * Used by fabric modules to determine when we need to delay processing
864 * for the Active/NonOptimized paths..
866 int core_alua_check_nonop_delay(
869 if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
874 * The ALUA Active/NonOptimized access state delay can be disabled
875 * in via configfs with a value of zero
877 if (!cmd->alua_nonop_delay)
880 * struct se_cmd->alua_nonop_delay gets set by a target port group
881 * defined interval in core_alua_state_nonoptimized()
883 msleep_interruptible(cmd->alua_nonop_delay);
886 EXPORT_SYMBOL(core_alua_check_nonop_delay);
888 static int core_alua_write_tpg_metadata(
890 unsigned char *md_buf,
893 struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
897 pr_err("filp_open(%s) for ALUA metadata failed\n", path);
900 ret = kernel_write(file, md_buf, md_buf_len, 0);
902 pr_err("Error writing ALUA metadata file: %s\n", path);
904 return (ret < 0) ? -EIO : 0;
908 * Called with tg_pt_gp->tg_pt_gp_md_mutex held
910 static int core_alua_update_tpg_primary_metadata(
911 struct t10_alua_tg_pt_gp *tg_pt_gp)
913 unsigned char *md_buf;
914 struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn;
915 char path[ALUA_METADATA_PATH_LEN];
918 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
920 pr_err("Unable to allocate buf for ALUA metadata\n");
924 memset(path, 0, ALUA_METADATA_PATH_LEN);
926 len = snprintf(md_buf, ALUA_MD_BUF_LEN,
928 "alua_access_state=0x%02x\n"
929 "alua_access_status=0x%02x\n",
930 tg_pt_gp->tg_pt_gp_id,
931 tg_pt_gp->tg_pt_gp_alua_pending_state,
932 tg_pt_gp->tg_pt_gp_alua_access_status);
934 snprintf(path, ALUA_METADATA_PATH_LEN,
935 "%s/alua/tpgs_%s/%s", db_root, &wwn->unit_serial[0],
936 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
938 rc = core_alua_write_tpg_metadata(path, md_buf, len);
943 static void core_alua_queue_state_change_ua(struct t10_alua_tg_pt_gp *tg_pt_gp)
945 struct se_dev_entry *se_deve;
947 struct se_lun_acl *lacl;
949 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
950 list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
953 * After an implicit target port asymmetric access state
954 * change, a device server shall establish a unit attention
955 * condition for the initiator port associated with every I_T
956 * nexus with the additional sense code set to ASYMMETRIC
957 * ACCESS STATE CHANGED.
959 * After an explicit target port asymmetric access state
960 * change, a device server shall establish a unit attention
961 * condition with the additional sense code set to ASYMMETRIC
962 * ACCESS STATE CHANGED for the initiator port associated with
963 * every I_T nexus other than the I_T nexus on which the SET
964 * TARGET PORT GROUPS command
966 if (!percpu_ref_tryget_live(&lun->lun_ref))
968 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
970 spin_lock(&lun->lun_deve_lock);
971 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) {
972 lacl = rcu_dereference_check(se_deve->se_lun_acl,
973 lockdep_is_held(&lun->lun_deve_lock));
977 * After an explicit target port asymmetric access
978 * state change, a device server shall establish a
979 * unit attention condition with the additional sense
980 * code set to ASYMMETRIC ACCESS STATE CHANGED for
981 * the initiator port associated with every I_T nexus
982 * other than the I_T nexus on which the SET TARGET
983 * PORT GROUPS command was received.
985 if ((tg_pt_gp->tg_pt_gp_alua_access_status ==
986 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
987 (tg_pt_gp->tg_pt_gp_alua_lun != NULL) &&
988 (tg_pt_gp->tg_pt_gp_alua_lun == lun))
992 * se_deve->se_lun_acl pointer may be NULL for a
993 * entry created without explicit Node+MappedLUN ACLs
995 if (lacl && (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) &&
996 (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl))
999 core_scsi3_ua_allocate(se_deve, 0x2A,
1000 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
1002 spin_unlock(&lun->lun_deve_lock);
1004 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1005 percpu_ref_put(&lun->lun_ref);
1007 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1010 static void core_alua_do_transition_tg_pt_work(struct work_struct *work)
1012 struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(work,
1013 struct t10_alua_tg_pt_gp, tg_pt_gp_transition_work);
1014 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1015 bool explicit = (tg_pt_gp->tg_pt_gp_alua_access_status ==
1016 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG);
1019 * Update the ALUA metadata buf that has been allocated in
1020 * core_alua_do_port_transition(), this metadata will be written
1023 * Note that there is the case where we do not want to update the
1024 * metadata when the saved metadata is being parsed in userspace
1025 * when setting the existing port access state and access status.
1027 * Also note that the failure to write out the ALUA metadata to
1028 * struct file does NOT affect the actual ALUA transition.
1030 if (tg_pt_gp->tg_pt_gp_write_metadata) {
1031 mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex);
1032 core_alua_update_tpg_primary_metadata(tg_pt_gp);
1033 mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex);
1036 * Set the current primary ALUA access state to the requested new state
1038 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1039 tg_pt_gp->tg_pt_gp_alua_pending_state);
1041 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1042 " from primary access state %s to %s\n", (explicit) ? "explicit" :
1043 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1044 tg_pt_gp->tg_pt_gp_id,
1045 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_previous_state),
1046 core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_pending_state));
1048 core_alua_queue_state_change_ua(tg_pt_gp);
1050 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1051 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1052 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1054 if (tg_pt_gp->tg_pt_gp_transition_complete)
1055 complete(tg_pt_gp->tg_pt_gp_transition_complete);
1058 static int core_alua_do_transition_tg_pt(
1059 struct t10_alua_tg_pt_gp *tg_pt_gp,
1063 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1064 DECLARE_COMPLETION_ONSTACK(wait);
1066 /* Nothing to be done here */
1067 if (atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == new_state)
1070 if (new_state == ALUA_ACCESS_STATE_TRANSITION)
1074 * Flush any pending transitions
1077 flush_work(&tg_pt_gp->tg_pt_gp_transition_work);
1080 * Save the old primary ALUA access state, and set the current state
1081 * to ALUA_ACCESS_STATE_TRANSITION.
1083 tg_pt_gp->tg_pt_gp_alua_previous_state =
1084 atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
1085 tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
1087 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1088 ALUA_ACCESS_STATE_TRANSITION);
1089 tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ?
1090 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1091 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1093 core_alua_queue_state_change_ua(tg_pt_gp);
1096 * Check for the optional ALUA primary state transition delay
1098 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
1099 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
1102 * Take a reference for workqueue item
1104 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1105 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1106 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1108 schedule_work(&tg_pt_gp->tg_pt_gp_transition_work);
1110 tg_pt_gp->tg_pt_gp_transition_complete = &wait;
1111 wait_for_completion(&wait);
1112 tg_pt_gp->tg_pt_gp_transition_complete = NULL;
1118 int core_alua_do_port_transition(
1119 struct t10_alua_tg_pt_gp *l_tg_pt_gp,
1120 struct se_device *l_dev,
1121 struct se_lun *l_lun,
1122 struct se_node_acl *l_nacl,
1126 struct se_device *dev;
1127 struct t10_alua_lu_gp *lu_gp;
1128 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
1129 struct t10_alua_tg_pt_gp *tg_pt_gp;
1130 int primary, valid_states, rc = 0;
1132 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
1133 if (core_alua_check_transition(new_state, valid_states, &primary) != 0)
1136 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
1137 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
1138 lu_gp = local_lu_gp_mem->lu_gp;
1139 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1140 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
1142 * For storage objects that are members of the 'default_lu_gp',
1143 * we only do transition on the passed *l_tp_pt_gp, and not
1144 * on all of the matching target port groups IDs in default_lu_gp.
1146 if (!lu_gp->lu_gp_id) {
1148 * core_alua_do_transition_tg_pt() will always return
1151 l_tg_pt_gp->tg_pt_gp_alua_lun = l_lun;
1152 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1153 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp,
1154 new_state, explicit);
1155 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1159 * For all other LU groups aside from 'default_lu_gp', walk all of
1160 * the associated storage objects looking for a matching target port
1161 * group ID from the local target port group.
1163 spin_lock(&lu_gp->lu_gp_lock);
1164 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
1167 dev = lu_gp_mem->lu_gp_mem_dev;
1168 atomic_inc_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1169 spin_unlock(&lu_gp->lu_gp_lock);
1171 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1172 list_for_each_entry(tg_pt_gp,
1173 &dev->t10_alua.tg_pt_gps_list,
1176 if (!tg_pt_gp->tg_pt_gp_valid_id)
1179 * If the target behavior port asymmetric access state
1180 * is changed for any target port group accessible via
1181 * a logical unit within a LU group, the target port
1182 * behavior group asymmetric access states for the same
1183 * target port group accessible via other logical units
1184 * in that LU group will also change.
1186 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
1189 if (l_tg_pt_gp == tg_pt_gp) {
1190 tg_pt_gp->tg_pt_gp_alua_lun = l_lun;
1191 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1193 tg_pt_gp->tg_pt_gp_alua_lun = NULL;
1194 tg_pt_gp->tg_pt_gp_alua_nacl = NULL;
1196 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1197 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1199 * core_alua_do_transition_tg_pt() will always return
1202 rc = core_alua_do_transition_tg_pt(tg_pt_gp,
1203 new_state, explicit);
1205 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1206 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1210 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1212 spin_lock(&lu_gp->lu_gp_lock);
1213 atomic_dec_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1215 spin_unlock(&lu_gp->lu_gp_lock);
1218 pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
1219 " Group IDs: %hu %s transition to primary state: %s\n",
1220 config_item_name(&lu_gp->lu_gp_group.cg_item),
1221 l_tg_pt_gp->tg_pt_gp_id,
1222 (explicit) ? "explicit" : "implicit",
1223 core_alua_dump_state(new_state));
1226 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1230 static int core_alua_update_tpg_secondary_metadata(struct se_lun *lun)
1232 struct se_portal_group *se_tpg = lun->lun_tpg;
1233 unsigned char *md_buf;
1234 char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN];
1237 mutex_lock(&lun->lun_tg_pt_md_mutex);
1239 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
1241 pr_err("Unable to allocate buf for ALUA metadata\n");
1246 memset(path, 0, ALUA_METADATA_PATH_LEN);
1247 memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN);
1249 len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s",
1250 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg));
1252 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL)
1253 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu",
1254 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
1256 len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n"
1257 "alua_tg_pt_status=0x%02x\n",
1258 atomic_read(&lun->lun_tg_pt_secondary_offline),
1259 lun->lun_tg_pt_secondary_stat);
1261 snprintf(path, ALUA_METADATA_PATH_LEN, "%s/alua/%s/%s/lun_%llu",
1262 db_root, se_tpg->se_tpg_tfo->get_fabric_name(), wwn,
1265 rc = core_alua_write_tpg_metadata(path, md_buf, len);
1269 mutex_unlock(&lun->lun_tg_pt_md_mutex);
1273 static int core_alua_set_tg_pt_secondary_state(
1278 struct t10_alua_tg_pt_gp *tg_pt_gp;
1279 int trans_delay_msecs;
1281 spin_lock(&lun->lun_tg_pt_gp_lock);
1282 tg_pt_gp = lun->lun_tg_pt_gp;
1284 spin_unlock(&lun->lun_tg_pt_gp_lock);
1285 pr_err("Unable to complete secondary state"
1289 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
1291 * Set the secondary ALUA target port access state to OFFLINE
1292 * or release the previously secondary state for struct se_lun
1295 atomic_set(&lun->lun_tg_pt_secondary_offline, 1);
1297 atomic_set(&lun->lun_tg_pt_secondary_offline, 0);
1299 lun->lun_tg_pt_secondary_stat = (explicit) ?
1300 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1301 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1303 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1304 " to secondary access state: %s\n", (explicit) ? "explicit" :
1305 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1306 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
1308 spin_unlock(&lun->lun_tg_pt_gp_lock);
1310 * Do the optional transition delay after we set the secondary
1311 * ALUA access state.
1313 if (trans_delay_msecs != 0)
1314 msleep_interruptible(trans_delay_msecs);
1316 * See if we need to update the ALUA fabric port metadata for
1317 * secondary state and status
1319 if (lun->lun_tg_pt_secondary_write_md)
1320 core_alua_update_tpg_secondary_metadata(lun);
1325 struct t10_alua_lba_map *
1326 core_alua_allocate_lba_map(struct list_head *list,
1327 u64 first_lba, u64 last_lba)
1329 struct t10_alua_lba_map *lba_map;
1331 lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL);
1333 pr_err("Unable to allocate struct t10_alua_lba_map\n");
1334 return ERR_PTR(-ENOMEM);
1336 INIT_LIST_HEAD(&lba_map->lba_map_mem_list);
1337 lba_map->lba_map_first_lba = first_lba;
1338 lba_map->lba_map_last_lba = last_lba;
1340 list_add_tail(&lba_map->lba_map_list, list);
1345 core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map,
1346 int pg_id, int state)
1348 struct t10_alua_lba_map_member *lba_map_mem;
1350 list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list,
1352 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) {
1353 pr_err("Duplicate pg_id %d in lba_map\n", pg_id);
1358 lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL);
1360 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n");
1363 lba_map_mem->lba_map_mem_alua_state = state;
1364 lba_map_mem->lba_map_mem_alua_pg_id = pg_id;
1366 list_add_tail(&lba_map_mem->lba_map_mem_list,
1367 &lba_map->lba_map_mem_list);
1372 core_alua_free_lba_map(struct list_head *lba_list)
1374 struct t10_alua_lba_map *lba_map, *lba_map_tmp;
1375 struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp;
1377 list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list,
1379 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp,
1380 &lba_map->lba_map_mem_list,
1382 list_del(&lba_map_mem->lba_map_mem_list);
1383 kmem_cache_free(t10_alua_lba_map_mem_cache,
1386 list_del(&lba_map->lba_map_list);
1387 kmem_cache_free(t10_alua_lba_map_cache, lba_map);
1392 core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list,
1393 int segment_size, int segment_mult)
1395 struct list_head old_lba_map_list;
1396 struct t10_alua_tg_pt_gp *tg_pt_gp;
1397 int activate = 0, supported;
1399 INIT_LIST_HEAD(&old_lba_map_list);
1400 spin_lock(&dev->t10_alua.lba_map_lock);
1401 dev->t10_alua.lba_map_segment_size = segment_size;
1402 dev->t10_alua.lba_map_segment_multiplier = segment_mult;
1403 list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list);
1405 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list);
1408 spin_unlock(&dev->t10_alua.lba_map_lock);
1409 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1410 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1413 if (!tg_pt_gp->tg_pt_gp_valid_id)
1415 supported = tg_pt_gp->tg_pt_gp_alua_supported_states;
1417 supported |= ALUA_LBD_SUP;
1419 supported &= ~ALUA_LBD_SUP;
1420 tg_pt_gp->tg_pt_gp_alua_supported_states = supported;
1422 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1423 core_alua_free_lba_map(&old_lba_map_list);
1426 struct t10_alua_lu_gp *
1427 core_alua_allocate_lu_gp(const char *name, int def_group)
1429 struct t10_alua_lu_gp *lu_gp;
1431 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
1433 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1434 return ERR_PTR(-ENOMEM);
1436 INIT_LIST_HEAD(&lu_gp->lu_gp_node);
1437 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
1438 spin_lock_init(&lu_gp->lu_gp_lock);
1439 atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
1442 lu_gp->lu_gp_id = alua_lu_gps_counter++;
1443 lu_gp->lu_gp_valid_id = 1;
1444 alua_lu_gps_count++;
1450 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
1452 struct t10_alua_lu_gp *lu_gp_tmp;
1455 * The lu_gp->lu_gp_id may only be set once..
1457 if (lu_gp->lu_gp_valid_id) {
1458 pr_warn("ALUA LU Group already has a valid ID,"
1459 " ignoring request\n");
1463 spin_lock(&lu_gps_lock);
1464 if (alua_lu_gps_count == 0x0000ffff) {
1465 pr_err("Maximum ALUA alua_lu_gps_count:"
1466 " 0x0000ffff reached\n");
1467 spin_unlock(&lu_gps_lock);
1468 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1472 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
1473 alua_lu_gps_counter++;
1475 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
1476 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
1480 pr_warn("ALUA Logical Unit Group ID: %hu"
1481 " already exists, ignoring request\n",
1483 spin_unlock(&lu_gps_lock);
1488 lu_gp->lu_gp_id = lu_gp_id_tmp;
1489 lu_gp->lu_gp_valid_id = 1;
1490 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
1491 alua_lu_gps_count++;
1492 spin_unlock(&lu_gps_lock);
1497 static struct t10_alua_lu_gp_member *
1498 core_alua_allocate_lu_gp_mem(struct se_device *dev)
1500 struct t10_alua_lu_gp_member *lu_gp_mem;
1502 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
1504 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1505 return ERR_PTR(-ENOMEM);
1507 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
1508 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
1509 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
1511 lu_gp_mem->lu_gp_mem_dev = dev;
1512 dev->dev_alua_lu_gp_mem = lu_gp_mem;
1517 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
1519 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
1521 * Once we have reached this point, config_item_put() has
1522 * already been called from target_core_alua_drop_lu_gp().
1524 * Here, we remove the *lu_gp from the global list so that
1525 * no associations can be made while we are releasing
1526 * struct t10_alua_lu_gp.
1528 spin_lock(&lu_gps_lock);
1529 list_del(&lu_gp->lu_gp_node);
1530 alua_lu_gps_count--;
1531 spin_unlock(&lu_gps_lock);
1533 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1534 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1535 * released with core_alua_put_lu_gp_from_name()
1537 while (atomic_read(&lu_gp->lu_gp_ref_cnt))
1540 * Release reference to struct t10_alua_lu_gp * from all associated
1543 spin_lock(&lu_gp->lu_gp_lock);
1544 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
1545 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
1546 if (lu_gp_mem->lu_gp_assoc) {
1547 list_del(&lu_gp_mem->lu_gp_mem_list);
1548 lu_gp->lu_gp_members--;
1549 lu_gp_mem->lu_gp_assoc = 0;
1551 spin_unlock(&lu_gp->lu_gp_lock);
1554 * lu_gp_mem is associated with a single
1555 * struct se_device->dev_alua_lu_gp_mem, and is released when
1556 * struct se_device is released via core_alua_free_lu_gp_mem().
1558 * If the passed lu_gp does NOT match the default_lu_gp, assume
1559 * we want to re-associate a given lu_gp_mem with default_lu_gp.
1561 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1562 if (lu_gp != default_lu_gp)
1563 __core_alua_attach_lu_gp_mem(lu_gp_mem,
1566 lu_gp_mem->lu_gp = NULL;
1567 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1569 spin_lock(&lu_gp->lu_gp_lock);
1571 spin_unlock(&lu_gp->lu_gp_lock);
1573 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1576 void core_alua_free_lu_gp_mem(struct se_device *dev)
1578 struct t10_alua_lu_gp *lu_gp;
1579 struct t10_alua_lu_gp_member *lu_gp_mem;
1581 lu_gp_mem = dev->dev_alua_lu_gp_mem;
1585 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
1588 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1589 lu_gp = lu_gp_mem->lu_gp;
1591 spin_lock(&lu_gp->lu_gp_lock);
1592 if (lu_gp_mem->lu_gp_assoc) {
1593 list_del(&lu_gp_mem->lu_gp_mem_list);
1594 lu_gp->lu_gp_members--;
1595 lu_gp_mem->lu_gp_assoc = 0;
1597 spin_unlock(&lu_gp->lu_gp_lock);
1598 lu_gp_mem->lu_gp = NULL;
1600 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1602 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
1605 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
1607 struct t10_alua_lu_gp *lu_gp;
1608 struct config_item *ci;
1610 spin_lock(&lu_gps_lock);
1611 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
1612 if (!lu_gp->lu_gp_valid_id)
1614 ci = &lu_gp->lu_gp_group.cg_item;
1615 if (!strcmp(config_item_name(ci), name)) {
1616 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1617 spin_unlock(&lu_gps_lock);
1621 spin_unlock(&lu_gps_lock);
1626 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
1628 spin_lock(&lu_gps_lock);
1629 atomic_dec(&lu_gp->lu_gp_ref_cnt);
1630 spin_unlock(&lu_gps_lock);
1634 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1636 void __core_alua_attach_lu_gp_mem(
1637 struct t10_alua_lu_gp_member *lu_gp_mem,
1638 struct t10_alua_lu_gp *lu_gp)
1640 spin_lock(&lu_gp->lu_gp_lock);
1641 lu_gp_mem->lu_gp = lu_gp;
1642 lu_gp_mem->lu_gp_assoc = 1;
1643 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
1644 lu_gp->lu_gp_members++;
1645 spin_unlock(&lu_gp->lu_gp_lock);
1649 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1651 void __core_alua_drop_lu_gp_mem(
1652 struct t10_alua_lu_gp_member *lu_gp_mem,
1653 struct t10_alua_lu_gp *lu_gp)
1655 spin_lock(&lu_gp->lu_gp_lock);
1656 list_del(&lu_gp_mem->lu_gp_mem_list);
1657 lu_gp_mem->lu_gp = NULL;
1658 lu_gp_mem->lu_gp_assoc = 0;
1659 lu_gp->lu_gp_members--;
1660 spin_unlock(&lu_gp->lu_gp_lock);
1663 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
1664 const char *name, int def_group)
1666 struct t10_alua_tg_pt_gp *tg_pt_gp;
1668 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
1670 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1673 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
1674 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_lun_list);
1675 mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex);
1676 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
1677 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
1678 INIT_WORK(&tg_pt_gp->tg_pt_gp_transition_work,
1679 core_alua_do_transition_tg_pt_work);
1680 tg_pt_gp->tg_pt_gp_dev = dev;
1681 atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
1682 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED);
1684 * Enable both explicit and implicit ALUA support by default
1686 tg_pt_gp->tg_pt_gp_alua_access_type =
1687 TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA;
1689 * Set the default Active/NonOptimized Delay in milliseconds
1691 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
1692 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
1693 tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS;
1696 * Enable all supported states
1698 tg_pt_gp->tg_pt_gp_alua_supported_states =
1699 ALUA_T_SUP | ALUA_O_SUP |
1700 ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP;
1703 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1704 tg_pt_gp->tg_pt_gp_id =
1705 dev->t10_alua.alua_tg_pt_gps_counter++;
1706 tg_pt_gp->tg_pt_gp_valid_id = 1;
1707 dev->t10_alua.alua_tg_pt_gps_count++;
1708 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1709 &dev->t10_alua.tg_pt_gps_list);
1710 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1716 int core_alua_set_tg_pt_gp_id(
1717 struct t10_alua_tg_pt_gp *tg_pt_gp,
1720 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1721 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
1722 u16 tg_pt_gp_id_tmp;
1725 * The tg_pt_gp->tg_pt_gp_id may only be set once..
1727 if (tg_pt_gp->tg_pt_gp_valid_id) {
1728 pr_warn("ALUA TG PT Group already has a valid ID,"
1729 " ignoring request\n");
1733 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1734 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
1735 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1736 " 0x0000ffff reached\n");
1737 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1741 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
1742 dev->t10_alua.alua_tg_pt_gps_counter++;
1744 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list,
1746 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
1750 pr_err("ALUA Target Port Group ID: %hu already"
1751 " exists, ignoring request\n", tg_pt_gp_id);
1752 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1757 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
1758 tg_pt_gp->tg_pt_gp_valid_id = 1;
1759 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1760 &dev->t10_alua.tg_pt_gps_list);
1761 dev->t10_alua.alua_tg_pt_gps_count++;
1762 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1767 void core_alua_free_tg_pt_gp(
1768 struct t10_alua_tg_pt_gp *tg_pt_gp)
1770 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1771 struct se_lun *lun, *next;
1774 * Once we have reached this point, config_item_put() has already
1775 * been called from target_core_alua_drop_tg_pt_gp().
1777 * Here we remove *tg_pt_gp from the global list so that
1778 * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS
1779 * can be made while we are releasing struct t10_alua_tg_pt_gp.
1781 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1782 list_del(&tg_pt_gp->tg_pt_gp_list);
1783 dev->t10_alua.alua_tg_pt_gps_counter--;
1784 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1786 flush_work(&tg_pt_gp->tg_pt_gp_transition_work);
1789 * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1790 * core_alua_get_tg_pt_gp_by_name() in
1791 * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1792 * to be released with core_alua_put_tg_pt_gp_from_name().
1794 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
1798 * Release reference to struct t10_alua_tg_pt_gp from all associated
1801 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1802 list_for_each_entry_safe(lun, next,
1803 &tg_pt_gp->tg_pt_gp_lun_list, lun_tg_pt_gp_link) {
1804 list_del_init(&lun->lun_tg_pt_gp_link);
1805 tg_pt_gp->tg_pt_gp_members--;
1807 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1809 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1810 * assume we want to re-associate a given tg_pt_gp_mem with
1813 spin_lock(&lun->lun_tg_pt_gp_lock);
1814 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
1815 __target_attach_tg_pt_gp(lun,
1816 dev->t10_alua.default_tg_pt_gp);
1818 lun->lun_tg_pt_gp = NULL;
1819 spin_unlock(&lun->lun_tg_pt_gp_lock);
1821 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1823 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1825 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1828 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
1829 struct se_device *dev, const char *name)
1831 struct t10_alua_tg_pt_gp *tg_pt_gp;
1832 struct config_item *ci;
1834 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1835 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1837 if (!tg_pt_gp->tg_pt_gp_valid_id)
1839 ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1840 if (!strcmp(config_item_name(ci), name)) {
1841 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1842 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1846 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1851 static void core_alua_put_tg_pt_gp_from_name(
1852 struct t10_alua_tg_pt_gp *tg_pt_gp)
1854 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1856 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1857 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1858 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1861 static void __target_attach_tg_pt_gp(struct se_lun *lun,
1862 struct t10_alua_tg_pt_gp *tg_pt_gp)
1864 struct se_dev_entry *se_deve;
1866 assert_spin_locked(&lun->lun_tg_pt_gp_lock);
1868 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1869 lun->lun_tg_pt_gp = tg_pt_gp;
1870 list_add_tail(&lun->lun_tg_pt_gp_link, &tg_pt_gp->tg_pt_gp_lun_list);
1871 tg_pt_gp->tg_pt_gp_members++;
1872 spin_lock(&lun->lun_deve_lock);
1873 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link)
1874 core_scsi3_ua_allocate(se_deve, 0x3f,
1875 ASCQ_3FH_INQUIRY_DATA_HAS_CHANGED);
1876 spin_unlock(&lun->lun_deve_lock);
1877 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1880 void target_attach_tg_pt_gp(struct se_lun *lun,
1881 struct t10_alua_tg_pt_gp *tg_pt_gp)
1883 spin_lock(&lun->lun_tg_pt_gp_lock);
1884 __target_attach_tg_pt_gp(lun, tg_pt_gp);
1885 spin_unlock(&lun->lun_tg_pt_gp_lock);
1888 static void __target_detach_tg_pt_gp(struct se_lun *lun,
1889 struct t10_alua_tg_pt_gp *tg_pt_gp)
1891 assert_spin_locked(&lun->lun_tg_pt_gp_lock);
1893 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1894 list_del_init(&lun->lun_tg_pt_gp_link);
1895 tg_pt_gp->tg_pt_gp_members--;
1896 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1898 lun->lun_tg_pt_gp = NULL;
1901 void target_detach_tg_pt_gp(struct se_lun *lun)
1903 struct t10_alua_tg_pt_gp *tg_pt_gp;
1905 spin_lock(&lun->lun_tg_pt_gp_lock);
1906 tg_pt_gp = lun->lun_tg_pt_gp;
1908 __target_detach_tg_pt_gp(lun, tg_pt_gp);
1909 spin_unlock(&lun->lun_tg_pt_gp_lock);
1912 ssize_t core_alua_show_tg_pt_gp_info(struct se_lun *lun, char *page)
1914 struct config_item *tg_pt_ci;
1915 struct t10_alua_tg_pt_gp *tg_pt_gp;
1918 spin_lock(&lun->lun_tg_pt_gp_lock);
1919 tg_pt_gp = lun->lun_tg_pt_gp;
1921 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1922 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
1923 " %hu\nTG Port Primary Access State: %s\nTG Port "
1924 "Primary Access Status: %s\nTG Port Secondary Access"
1925 " State: %s\nTG Port Secondary Access Status: %s\n",
1926 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
1927 core_alua_dump_state(atomic_read(
1928 &tg_pt_gp->tg_pt_gp_alua_access_state)),
1929 core_alua_dump_status(
1930 tg_pt_gp->tg_pt_gp_alua_access_status),
1931 atomic_read(&lun->lun_tg_pt_secondary_offline) ?
1933 core_alua_dump_status(lun->lun_tg_pt_secondary_stat));
1935 spin_unlock(&lun->lun_tg_pt_gp_lock);
1940 ssize_t core_alua_store_tg_pt_gp_info(
1945 struct se_portal_group *tpg = lun->lun_tpg;
1947 * rcu_dereference_raw protected by se_lun->lun_group symlink
1948 * reference to se_device->dev_group.
1950 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
1951 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
1952 unsigned char buf[TG_PT_GROUP_NAME_BUF];
1955 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH ||
1956 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
1959 if (count > TG_PT_GROUP_NAME_BUF) {
1960 pr_err("ALUA Target Port Group alias too large!\n");
1963 memset(buf, 0, TG_PT_GROUP_NAME_BUF);
1964 memcpy(buf, page, count);
1966 * Any ALUA target port group alias besides "NULL" means we will be
1967 * making a new group association.
1969 if (strcmp(strstrip(buf), "NULL")) {
1971 * core_alua_get_tg_pt_gp_by_name() will increment reference to
1972 * struct t10_alua_tg_pt_gp. This reference is released with
1973 * core_alua_put_tg_pt_gp_from_name() below.
1975 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev,
1981 spin_lock(&lun->lun_tg_pt_gp_lock);
1982 tg_pt_gp = lun->lun_tg_pt_gp;
1985 * Clearing an existing tg_pt_gp association, and replacing
1986 * with the default_tg_pt_gp.
1988 if (!tg_pt_gp_new) {
1989 pr_debug("Target_Core_ConfigFS: Moving"
1990 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
1991 " alua/%s, ID: %hu back to"
1992 " default_tg_pt_gp\n",
1993 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1994 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1995 config_item_name(&lun->lun_group.cg_item),
1997 &tg_pt_gp->tg_pt_gp_group.cg_item),
1998 tg_pt_gp->tg_pt_gp_id);
2000 __target_detach_tg_pt_gp(lun, tg_pt_gp);
2001 __target_attach_tg_pt_gp(lun,
2002 dev->t10_alua.default_tg_pt_gp);
2003 spin_unlock(&lun->lun_tg_pt_gp_lock);
2007 __target_detach_tg_pt_gp(lun, tg_pt_gp);
2011 __target_attach_tg_pt_gp(lun, tg_pt_gp_new);
2012 spin_unlock(&lun->lun_tg_pt_gp_lock);
2013 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
2014 " Target Port Group: alua/%s, ID: %hu\n", (move) ?
2015 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
2016 tpg->se_tpg_tfo->tpg_get_tag(tpg),
2017 config_item_name(&lun->lun_group.cg_item),
2018 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
2019 tg_pt_gp_new->tg_pt_gp_id);
2021 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
2025 ssize_t core_alua_show_access_type(
2026 struct t10_alua_tg_pt_gp *tg_pt_gp,
2029 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) &&
2030 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA))
2031 return sprintf(page, "Implicit and Explicit\n");
2032 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)
2033 return sprintf(page, "Implicit\n");
2034 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)
2035 return sprintf(page, "Explicit\n");
2037 return sprintf(page, "None\n");
2040 ssize_t core_alua_store_access_type(
2041 struct t10_alua_tg_pt_gp *tg_pt_gp,
2048 ret = kstrtoul(page, 0, &tmp);
2050 pr_err("Unable to extract alua_access_type\n");
2053 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
2054 pr_err("Illegal value for alua_access_type:"
2059 tg_pt_gp->tg_pt_gp_alua_access_type =
2060 TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA;
2062 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA;
2064 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA;
2066 tg_pt_gp->tg_pt_gp_alua_access_type = 0;
2071 ssize_t core_alua_show_nonop_delay_msecs(
2072 struct t10_alua_tg_pt_gp *tg_pt_gp,
2075 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
2078 ssize_t core_alua_store_nonop_delay_msecs(
2079 struct t10_alua_tg_pt_gp *tg_pt_gp,
2086 ret = kstrtoul(page, 0, &tmp);
2088 pr_err("Unable to extract nonop_delay_msecs\n");
2091 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
2092 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
2093 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
2094 ALUA_MAX_NONOP_DELAY_MSECS);
2097 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
2102 ssize_t core_alua_show_trans_delay_msecs(
2103 struct t10_alua_tg_pt_gp *tg_pt_gp,
2106 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
2109 ssize_t core_alua_store_trans_delay_msecs(
2110 struct t10_alua_tg_pt_gp *tg_pt_gp,
2117 ret = kstrtoul(page, 0, &tmp);
2119 pr_err("Unable to extract trans_delay_msecs\n");
2122 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
2123 pr_err("Passed trans_delay_msecs: %lu, exceeds"
2124 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
2125 ALUA_MAX_TRANS_DELAY_MSECS);
2128 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
2133 ssize_t core_alua_show_implicit_trans_secs(
2134 struct t10_alua_tg_pt_gp *tg_pt_gp,
2137 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs);
2140 ssize_t core_alua_store_implicit_trans_secs(
2141 struct t10_alua_tg_pt_gp *tg_pt_gp,
2148 ret = kstrtoul(page, 0, &tmp);
2150 pr_err("Unable to extract implicit_trans_secs\n");
2153 if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) {
2154 pr_err("Passed implicit_trans_secs: %lu, exceeds"
2155 " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp,
2156 ALUA_MAX_IMPLICIT_TRANS_SECS);
2159 tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp;
2164 ssize_t core_alua_show_preferred_bit(
2165 struct t10_alua_tg_pt_gp *tg_pt_gp,
2168 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
2171 ssize_t core_alua_store_preferred_bit(
2172 struct t10_alua_tg_pt_gp *tg_pt_gp,
2179 ret = kstrtoul(page, 0, &tmp);
2181 pr_err("Unable to extract preferred ALUA value\n");
2184 if ((tmp != 0) && (tmp != 1)) {
2185 pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
2188 tg_pt_gp->tg_pt_gp_pref = (int)tmp;
2193 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
2195 return sprintf(page, "%d\n",
2196 atomic_read(&lun->lun_tg_pt_secondary_offline));
2199 ssize_t core_alua_store_offline_bit(
2205 * rcu_dereference_raw protected by se_lun->lun_group symlink
2206 * reference to se_device->dev_group.
2208 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
2212 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH ||
2213 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
2216 ret = kstrtoul(page, 0, &tmp);
2218 pr_err("Unable to extract alua_tg_pt_offline value\n");
2221 if ((tmp != 0) && (tmp != 1)) {
2222 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
2227 ret = core_alua_set_tg_pt_secondary_state(lun, 0, (int)tmp);
2234 ssize_t core_alua_show_secondary_status(
2238 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_stat);
2241 ssize_t core_alua_store_secondary_status(
2249 ret = kstrtoul(page, 0, &tmp);
2251 pr_err("Unable to extract alua_tg_pt_status\n");
2254 if ((tmp != ALUA_STATUS_NONE) &&
2255 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
2256 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2257 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
2261 lun->lun_tg_pt_secondary_stat = (int)tmp;
2266 ssize_t core_alua_show_secondary_write_metadata(
2270 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_write_md);
2273 ssize_t core_alua_store_secondary_write_metadata(
2281 ret = kstrtoul(page, 0, &tmp);
2283 pr_err("Unable to extract alua_tg_pt_write_md\n");
2286 if ((tmp != 0) && (tmp != 1)) {
2287 pr_err("Illegal value for alua_tg_pt_write_md:"
2291 lun->lun_tg_pt_secondary_write_md = (int)tmp;
2296 int core_setup_alua(struct se_device *dev)
2298 if (!(dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) &&
2299 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
2300 struct t10_alua_lu_gp_member *lu_gp_mem;
2303 * Associate this struct se_device with the default ALUA
2306 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
2307 if (IS_ERR(lu_gp_mem))
2308 return PTR_ERR(lu_gp_mem);
2310 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2311 __core_alua_attach_lu_gp_mem(lu_gp_mem,
2313 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2315 pr_debug("%s: Adding to default ALUA LU Group:"
2316 " core/alua/lu_gps/default_lu_gp\n",
2317 dev->transport->name);