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/delay.h>
30 #include <linux/export.h>
31 #include <linux/fcntl.h>
32 #include <linux/file.h>
34 #include <scsi/scsi_proto.h>
35 #include <asm/unaligned.h>
37 #include <target/target_core_base.h>
38 #include <target/target_core_backend.h>
39 #include <target/target_core_fabric.h>
41 #include "target_core_internal.h"
42 #include "target_core_alua.h"
43 #include "target_core_ua.h"
45 static sense_reason_t core_alua_check_transition(int state, int valid,
46 int *primary, int explicit);
47 static int core_alua_set_tg_pt_secondary_state(
48 struct se_lun *lun, int explicit, int offline);
50 static char *core_alua_dump_state(int state);
52 static void __target_attach_tg_pt_gp(struct se_lun *lun,
53 struct t10_alua_tg_pt_gp *tg_pt_gp);
55 static u16 alua_lu_gps_counter;
56 static u32 alua_lu_gps_count;
58 static DEFINE_SPINLOCK(lu_gps_lock);
59 static LIST_HEAD(lu_gps_list);
61 struct t10_alua_lu_gp *default_lu_gp;
66 * See sbc3r35 section 5.23
69 target_emulate_report_referrals(struct se_cmd *cmd)
71 struct se_device *dev = cmd->se_dev;
72 struct t10_alua_lba_map *map;
73 struct t10_alua_lba_map_member *map_mem;
77 if (cmd->data_length < 4) {
78 pr_warn("REPORT REFERRALS allocation length %u too"
79 " small\n", cmd->data_length);
80 return TCM_INVALID_CDB_FIELD;
83 buf = transport_kmap_data_sg(cmd);
85 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
88 spin_lock(&dev->t10_alua.lba_map_lock);
89 if (list_empty(&dev->t10_alua.lba_map_list)) {
90 spin_unlock(&dev->t10_alua.lba_map_lock);
91 transport_kunmap_data_sg(cmd);
93 return TCM_UNSUPPORTED_SCSI_OPCODE;
96 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
98 int desc_num = off + 3;
102 if (cmd->data_length > off)
103 put_unaligned_be64(map->lba_map_first_lba, &buf[off]);
105 if (cmd->data_length > off)
106 put_unaligned_be64(map->lba_map_last_lba, &buf[off]);
110 list_for_each_entry(map_mem, &map->lba_map_mem_list,
112 int alua_state = map_mem->lba_map_mem_alua_state;
113 int alua_pg_id = map_mem->lba_map_mem_alua_pg_id;
115 if (cmd->data_length > off)
116 buf[off] = alua_state & 0x0f;
118 if (cmd->data_length > off)
119 buf[off] = (alua_pg_id >> 8) & 0xff;
121 if (cmd->data_length > off)
122 buf[off] = (alua_pg_id & 0xff);
127 if (cmd->data_length > desc_num)
128 buf[desc_num] = pg_num;
130 spin_unlock(&dev->t10_alua.lba_map_lock);
133 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
135 put_unaligned_be16(rd_len, &buf[2]);
137 transport_kunmap_data_sg(cmd);
139 target_complete_cmd(cmd, GOOD);
144 * REPORT_TARGET_PORT_GROUPS
146 * See spc4r17 section 6.27
149 target_emulate_report_target_port_groups(struct se_cmd *cmd)
151 struct se_device *dev = cmd->se_dev;
152 struct t10_alua_tg_pt_gp *tg_pt_gp;
156 int ext_hdr = (cmd->t_task_cdb[1] & 0x20);
159 * Skip over RESERVED area to first Target port group descriptor
160 * depending on the PARAMETER DATA FORMAT type..
167 if (cmd->data_length < off) {
168 pr_warn("REPORT TARGET PORT GROUPS allocation length %u too"
169 " small for %s header\n", cmd->data_length,
170 (ext_hdr) ? "extended" : "normal");
171 return TCM_INVALID_CDB_FIELD;
173 buf = transport_kmap_data_sg(cmd);
175 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
177 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
178 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
181 * Check if the Target port group and Target port descriptor list
182 * based on tg_pt_gp_members count will fit into the response payload.
183 * Otherwise, bump rd_len to let the initiator know we have exceeded
184 * the allocation length and the response is truncated.
186 if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) >
188 rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4);
192 * PREF: Preferred target port bit, determine if this
193 * bit should be set for port group.
195 if (tg_pt_gp->tg_pt_gp_pref)
198 * Set the ASYMMETRIC ACCESS State
200 buf[off++] |= tg_pt_gp->tg_pt_gp_alua_access_state & 0xff;
202 * Set supported ASYMMETRIC ACCESS State bits
204 buf[off++] |= tg_pt_gp->tg_pt_gp_alua_supported_states;
208 buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff);
209 buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff);
211 off++; /* Skip over Reserved */
215 buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff);
217 * Vendor Specific field
223 buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff);
226 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
227 list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
230 * Start Target Port descriptor format
232 * See spc4r17 section 6.2.7 Table 247
234 off += 2; /* Skip over Obsolete */
236 * Set RELATIVE TARGET PORT IDENTIFIER
238 buf[off++] = ((lun->lun_rtpi >> 8) & 0xff);
239 buf[off++] = (lun->lun_rtpi & 0xff);
242 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
244 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
246 * Set the RETURN DATA LENGTH set in the header of the DataIN Payload
248 put_unaligned_be32(rd_len, &buf[0]);
251 * Fill in the Extended header parameter data format if requested
256 * Set the implicit transition time (in seconds) for the application
257 * client to use as a base for it's transition timeout value.
259 * Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN
260 * this CDB was received upon to determine this value individually
261 * for ALUA target port group.
263 spin_lock(&cmd->se_lun->lun_tg_pt_gp_lock);
264 tg_pt_gp = cmd->se_lun->lun_tg_pt_gp;
266 buf[5] = tg_pt_gp->tg_pt_gp_implicit_trans_secs;
267 spin_unlock(&cmd->se_lun->lun_tg_pt_gp_lock);
269 transport_kunmap_data_sg(cmd);
271 target_complete_cmd(cmd, GOOD);
276 * SET_TARGET_PORT_GROUPS for explicit ALUA operation.
278 * See spc4r17 section 6.35
281 target_emulate_set_target_port_groups(struct se_cmd *cmd)
283 struct se_device *dev = cmd->se_dev;
284 struct se_lun *l_lun = cmd->se_lun;
285 struct se_node_acl *nacl = cmd->se_sess->se_node_acl;
286 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp;
289 sense_reason_t rc = TCM_NO_SENSE;
290 u32 len = 4; /* Skip over RESERVED area in header */
291 int alua_access_state, primary = 0, valid_states;
294 if (cmd->data_length < 4) {
295 pr_warn("SET TARGET PORT GROUPS parameter list length %u too"
296 " small\n", cmd->data_length);
297 return TCM_INVALID_PARAMETER_LIST;
300 buf = transport_kmap_data_sg(cmd);
302 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
305 * Determine if explicit ALUA via SET_TARGET_PORT_GROUPS is allowed
306 * for the local tg_pt_gp.
308 spin_lock(&l_lun->lun_tg_pt_gp_lock);
309 l_tg_pt_gp = l_lun->lun_tg_pt_gp;
311 spin_unlock(&l_lun->lun_tg_pt_gp_lock);
312 pr_err("Unable to access l_lun->tg_pt_gp\n");
313 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
317 if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) {
318 spin_unlock(&l_lun->lun_tg_pt_gp_lock);
319 pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
320 " while TPGS_EXPLICIT_ALUA is disabled\n");
321 rc = TCM_UNSUPPORTED_SCSI_OPCODE;
324 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
325 spin_unlock(&l_lun->lun_tg_pt_gp_lock);
327 ptr = &buf[4]; /* Skip over RESERVED area in header */
329 while (len < cmd->data_length) {
331 alua_access_state = (ptr[0] & 0x0f);
333 * Check the received ALUA access state, and determine if
334 * the state is a primary or secondary target port asymmetric
337 rc = core_alua_check_transition(alua_access_state, valid_states,
341 * If the SET TARGET PORT GROUPS attempts to establish
342 * an invalid combination of target port asymmetric
343 * access states or attempts to establish an
344 * unsupported target port asymmetric access state,
345 * then the command shall be terminated with CHECK
346 * CONDITION status, with the sense key set to ILLEGAL
347 * REQUEST, and the additional sense code set to INVALID
348 * FIELD IN PARAMETER LIST.
354 * If the ASYMMETRIC ACCESS STATE field (see table 267)
355 * specifies a primary target port asymmetric access state,
356 * then the TARGET PORT GROUP OR TARGET PORT field specifies
357 * a primary target port group for which the primary target
358 * port asymmetric access state shall be changed. If the
359 * ASYMMETRIC ACCESS STATE field specifies a secondary target
360 * port asymmetric access state, then the TARGET PORT GROUP OR
361 * TARGET PORT field specifies the relative target port
362 * identifier (see 3.1.120) of the target port for which the
363 * secondary target port asymmetric access state shall be
367 tg_pt_id = get_unaligned_be16(ptr + 2);
369 * Locate the matching target port group ID from
370 * the global tg_pt_gp list
372 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
373 list_for_each_entry(tg_pt_gp,
374 &dev->t10_alua.tg_pt_gps_list,
376 if (!tg_pt_gp->tg_pt_gp_valid_id)
379 if (tg_pt_id != tg_pt_gp->tg_pt_gp_id)
382 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
384 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
386 if (!core_alua_do_port_transition(tg_pt_gp,
388 alua_access_state, 1))
391 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
392 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
395 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
400 * Extract the RELATIVE TARGET PORT IDENTIFIER to identify
401 * the Target Port in question for the the incoming
402 * SET_TARGET_PORT_GROUPS op.
404 rtpi = get_unaligned_be16(ptr + 2);
406 * Locate the matching relative target port identifier
407 * for the struct se_device storage object.
409 spin_lock(&dev->se_port_lock);
410 list_for_each_entry(lun, &dev->dev_sep_list,
412 if (lun->lun_rtpi != rtpi)
416 spin_unlock(&dev->se_port_lock);
418 if (!core_alua_set_tg_pt_secondary_state(
422 spin_lock(&dev->se_port_lock);
425 spin_unlock(&dev->se_port_lock);
429 rc = TCM_INVALID_PARAMETER_LIST;
438 transport_kunmap_data_sg(cmd);
440 target_complete_cmd(cmd, GOOD);
444 static inline void set_ascq(struct se_cmd *cmd, u8 alua_ascq)
447 * Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
448 * The ALUA additional sense code qualifier (ASCQ) is determined
449 * by the ALUA primary or secondary access state..
451 pr_debug("[%s]: ALUA TG Port not available, "
452 "SenseKey: NOT_READY, ASC/ASCQ: "
454 cmd->se_tfo->get_fabric_name(), alua_ascq);
456 cmd->scsi_asc = 0x04;
457 cmd->scsi_ascq = alua_ascq;
460 static inline void core_alua_state_nonoptimized(
463 int nonop_delay_msecs)
466 * Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
467 * later to determine if processing of this cmd needs to be
468 * temporarily delayed for the Active/NonOptimized primary access state.
470 cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
471 cmd->alua_nonop_delay = nonop_delay_msecs;
474 static inline int core_alua_state_lba_dependent(
476 struct t10_alua_tg_pt_gp *tg_pt_gp)
478 struct se_device *dev = cmd->se_dev;
479 u64 segment_size, segment_mult, sectors, lba;
481 /* Only need to check for cdb actually containing LBAs */
482 if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB))
485 spin_lock(&dev->t10_alua.lba_map_lock);
486 segment_size = dev->t10_alua.lba_map_segment_size;
487 segment_mult = dev->t10_alua.lba_map_segment_multiplier;
488 sectors = cmd->data_length / dev->dev_attrib.block_size;
490 lba = cmd->t_task_lba;
491 while (lba < cmd->t_task_lba + sectors) {
492 struct t10_alua_lba_map *cur_map = NULL, *map;
493 struct t10_alua_lba_map_member *map_mem;
495 list_for_each_entry(map, &dev->t10_alua.lba_map_list,
497 u64 start_lba, last_lba;
498 u64 first_lba = map->lba_map_first_lba;
502 start_lba = do_div(tmp, segment_size * segment_mult);
504 last_lba = first_lba + segment_size - 1;
505 if (start_lba >= first_lba &&
506 start_lba <= last_lba) {
512 last_lba = map->lba_map_last_lba;
513 if (lba >= first_lba && lba <= last_lba) {
521 spin_unlock(&dev->t10_alua.lba_map_lock);
522 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
525 list_for_each_entry(map_mem, &cur_map->lba_map_mem_list,
527 if (map_mem->lba_map_mem_alua_pg_id !=
528 tg_pt_gp->tg_pt_gp_id)
530 switch(map_mem->lba_map_mem_alua_state) {
531 case ALUA_ACCESS_STATE_STANDBY:
532 spin_unlock(&dev->t10_alua.lba_map_lock);
533 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
535 case ALUA_ACCESS_STATE_UNAVAILABLE:
536 spin_unlock(&dev->t10_alua.lba_map_lock);
537 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
544 spin_unlock(&dev->t10_alua.lba_map_lock);
548 static inline int core_alua_state_standby(
553 * Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
554 * spc4r17 section 5.9.2.4.4
563 case RECEIVE_DIAGNOSTIC:
564 case SEND_DIAGNOSTIC:
567 case SERVICE_ACTION_IN_16:
568 switch (cdb[1] & 0x1f) {
569 case SAI_READ_CAPACITY_16:
572 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
576 switch (cdb[1] & 0x1f) {
577 case MI_REPORT_TARGET_PGS:
580 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
583 case MAINTENANCE_OUT:
585 case MO_SET_TARGET_PGS:
588 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
592 case PERSISTENT_RESERVE_IN:
593 case PERSISTENT_RESERVE_OUT:
598 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
605 static inline int core_alua_state_unavailable(
610 * Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
611 * spc4r17 section 5.9.2.4.5
618 switch (cdb[1] & 0x1f) {
619 case MI_REPORT_TARGET_PGS:
622 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
625 case MAINTENANCE_OUT:
627 case MO_SET_TARGET_PGS:
630 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
638 set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
645 static inline int core_alua_state_transition(
650 * Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by
651 * spc4r17 section 5.9.2.5
658 switch (cdb[1] & 0x1f) {
659 case MI_REPORT_TARGET_PGS:
662 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
670 set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
678 * return 1: Is used to signal LUN not accessible, and check condition/not ready
679 * return 0: Used to signal success
680 * return -1: Used to signal failure, and invalid cdb field
683 target_alua_state_check(struct se_cmd *cmd)
685 struct se_device *dev = cmd->se_dev;
686 unsigned char *cdb = cmd->t_task_cdb;
687 struct se_lun *lun = cmd->se_lun;
688 struct t10_alua_tg_pt_gp *tg_pt_gp;
689 int out_alua_state, nonop_delay_msecs;
691 if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
693 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA)
697 * First, check for a struct se_port specific secondary ALUA target port
698 * access state: OFFLINE
700 if (atomic_read(&lun->lun_tg_pt_secondary_offline)) {
701 pr_debug("ALUA: Got secondary offline status for local"
703 set_ascq(cmd, ASCQ_04H_ALUA_OFFLINE);
704 return TCM_CHECK_CONDITION_NOT_READY;
707 if (!lun->lun_tg_pt_gp)
710 spin_lock(&lun->lun_tg_pt_gp_lock);
711 tg_pt_gp = lun->lun_tg_pt_gp;
712 out_alua_state = tg_pt_gp->tg_pt_gp_alua_access_state;
713 nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
715 // XXX: keeps using tg_pt_gp witout reference after unlock
716 spin_unlock(&lun->lun_tg_pt_gp_lock);
718 * Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED in a separate conditional
719 * statement so the compiler knows explicitly to check this case first.
720 * For the Optimized ALUA access state case, we want to process the
721 * incoming fabric cmd ASAP..
723 if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED)
726 switch (out_alua_state) {
727 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
728 core_alua_state_nonoptimized(cmd, cdb, nonop_delay_msecs);
730 case ALUA_ACCESS_STATE_STANDBY:
731 if (core_alua_state_standby(cmd, cdb))
732 return TCM_CHECK_CONDITION_NOT_READY;
734 case ALUA_ACCESS_STATE_UNAVAILABLE:
735 if (core_alua_state_unavailable(cmd, cdb))
736 return TCM_CHECK_CONDITION_NOT_READY;
738 case ALUA_ACCESS_STATE_TRANSITION:
739 if (core_alua_state_transition(cmd, cdb))
740 return TCM_CHECK_CONDITION_NOT_READY;
742 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
743 if (core_alua_state_lba_dependent(cmd, tg_pt_gp))
744 return TCM_CHECK_CONDITION_NOT_READY;
747 * OFFLINE is a secondary ALUA target port group access state, that is
748 * handled above with struct se_lun->lun_tg_pt_secondary_offline=1
750 case ALUA_ACCESS_STATE_OFFLINE:
752 pr_err("Unknown ALUA access state: 0x%02x\n",
754 return TCM_INVALID_CDB_FIELD;
761 * Check implicit and explicit ALUA state change request.
763 static sense_reason_t
764 core_alua_check_transition(int state, int valid, int *primary, int explicit)
767 * OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
768 * defined as primary target port asymmetric access states.
771 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
772 if (!(valid & ALUA_AO_SUP))
776 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
777 if (!(valid & ALUA_AN_SUP))
781 case ALUA_ACCESS_STATE_STANDBY:
782 if (!(valid & ALUA_S_SUP))
786 case ALUA_ACCESS_STATE_UNAVAILABLE:
787 if (!(valid & ALUA_U_SUP))
791 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
792 if (!(valid & ALUA_LBD_SUP))
796 case ALUA_ACCESS_STATE_OFFLINE:
798 * OFFLINE state is defined as a secondary target port
799 * asymmetric access state.
801 if (!(valid & ALUA_O_SUP))
805 case ALUA_ACCESS_STATE_TRANSITION:
806 if (!(valid & ALUA_T_SUP) || explicit)
808 * Transitioning is set internally and by tcmu daemon,
809 * and cannot be selected through a STPG.
815 pr_err("Unknown ALUA access state: 0x%02x\n", state);
816 return TCM_INVALID_PARAMETER_LIST;
822 pr_err("ALUA access state %s not supported",
823 core_alua_dump_state(state));
824 return TCM_INVALID_PARAMETER_LIST;
827 static char *core_alua_dump_state(int state)
830 case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
831 return "Active/Optimized";
832 case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
833 return "Active/NonOptimized";
834 case ALUA_ACCESS_STATE_LBA_DEPENDENT:
835 return "LBA Dependent";
836 case ALUA_ACCESS_STATE_STANDBY:
838 case ALUA_ACCESS_STATE_UNAVAILABLE:
839 return "Unavailable";
840 case ALUA_ACCESS_STATE_OFFLINE:
842 case ALUA_ACCESS_STATE_TRANSITION:
843 return "Transitioning";
851 char *core_alua_dump_status(int status)
854 case ALUA_STATUS_NONE:
856 case ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG:
857 return "Altered by Explicit STPG";
858 case ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA:
859 return "Altered by Implicit ALUA";
868 * Used by fabric modules to determine when we need to delay processing
869 * for the Active/NonOptimized paths..
871 int core_alua_check_nonop_delay(
874 if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
879 * The ALUA Active/NonOptimized access state delay can be disabled
880 * in via configfs with a value of zero
882 if (!cmd->alua_nonop_delay)
885 * struct se_cmd->alua_nonop_delay gets set by a target port group
886 * defined interval in core_alua_state_nonoptimized()
888 msleep_interruptible(cmd->alua_nonop_delay);
891 EXPORT_SYMBOL(core_alua_check_nonop_delay);
893 static int core_alua_write_tpg_metadata(
895 unsigned char *md_buf,
898 struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
902 pr_err("filp_open(%s) for ALUA metadata failed\n", path);
905 ret = kernel_write(file, md_buf, md_buf_len, 0);
907 pr_err("Error writing ALUA metadata file: %s\n", path);
909 return (ret < 0) ? -EIO : 0;
913 * Called with tg_pt_gp->tg_pt_gp_transition_mutex held
915 static int core_alua_update_tpg_primary_metadata(
916 struct t10_alua_tg_pt_gp *tg_pt_gp)
918 unsigned char *md_buf;
919 struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn;
920 char path[ALUA_METADATA_PATH_LEN];
923 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
925 pr_err("Unable to allocate buf for ALUA metadata\n");
929 memset(path, 0, ALUA_METADATA_PATH_LEN);
931 len = snprintf(md_buf, ALUA_MD_BUF_LEN,
933 "alua_access_state=0x%02x\n"
934 "alua_access_status=0x%02x\n",
935 tg_pt_gp->tg_pt_gp_id,
936 tg_pt_gp->tg_pt_gp_alua_access_state,
937 tg_pt_gp->tg_pt_gp_alua_access_status);
939 snprintf(path, ALUA_METADATA_PATH_LEN,
940 "%s/alua/tpgs_%s/%s", db_root, &wwn->unit_serial[0],
941 config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
943 rc = core_alua_write_tpg_metadata(path, md_buf, len);
948 static void core_alua_queue_state_change_ua(struct t10_alua_tg_pt_gp *tg_pt_gp)
950 struct se_dev_entry *se_deve;
952 struct se_lun_acl *lacl;
954 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
955 list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
958 * After an implicit target port asymmetric access state
959 * change, a device server shall establish a unit attention
960 * condition for the initiator port associated with every I_T
961 * nexus with the additional sense code set to ASYMMETRIC
962 * ACCESS STATE CHANGED.
964 * After an explicit target port asymmetric access state
965 * change, a device server shall establish a unit attention
966 * condition with the additional sense code set to ASYMMETRIC
967 * ACCESS STATE CHANGED for the initiator port associated with
968 * every I_T nexus other than the I_T nexus on which the SET
969 * TARGET PORT GROUPS command
971 if (!percpu_ref_tryget_live(&lun->lun_ref))
973 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
975 spin_lock(&lun->lun_deve_lock);
976 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) {
977 lacl = rcu_dereference_check(se_deve->se_lun_acl,
978 lockdep_is_held(&lun->lun_deve_lock));
982 * After an explicit target port asymmetric access
983 * state change, a device server shall establish a
984 * unit attention condition with the additional sense
985 * code set to ASYMMETRIC ACCESS STATE CHANGED for
986 * the initiator port associated with every I_T nexus
987 * other than the I_T nexus on which the SET TARGET
988 * PORT GROUPS command was received.
990 if ((tg_pt_gp->tg_pt_gp_alua_access_status ==
991 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
992 (tg_pt_gp->tg_pt_gp_alua_lun != NULL) &&
993 (tg_pt_gp->tg_pt_gp_alua_lun == lun))
997 * se_deve->se_lun_acl pointer may be NULL for a
998 * entry created without explicit Node+MappedLUN ACLs
1000 if (lacl && (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) &&
1001 (tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl))
1004 core_scsi3_ua_allocate(se_deve, 0x2A,
1005 ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
1007 spin_unlock(&lun->lun_deve_lock);
1009 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1010 percpu_ref_put(&lun->lun_ref);
1012 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1015 static int core_alua_do_transition_tg_pt(
1016 struct t10_alua_tg_pt_gp *tg_pt_gp,
1022 mutex_lock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1023 /* Nothing to be done here */
1024 if (tg_pt_gp->tg_pt_gp_alua_access_state == new_state) {
1025 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1029 if (explicit && new_state == ALUA_ACCESS_STATE_TRANSITION) {
1030 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1035 * Save the old primary ALUA access state, and set the current state
1036 * to ALUA_ACCESS_STATE_TRANSITION.
1038 prev_state = tg_pt_gp->tg_pt_gp_alua_access_state;
1039 tg_pt_gp->tg_pt_gp_alua_access_state = ALUA_ACCESS_STATE_TRANSITION;
1040 tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ?
1041 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1042 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1044 core_alua_queue_state_change_ua(tg_pt_gp);
1046 if (new_state == ALUA_ACCESS_STATE_TRANSITION) {
1047 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1052 * Check for the optional ALUA primary state transition delay
1054 if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
1055 msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
1058 * Set the current primary ALUA access state to the requested new state
1060 tg_pt_gp->tg_pt_gp_alua_access_state = new_state;
1063 * Update the ALUA metadata buf that has been allocated in
1064 * core_alua_do_port_transition(), this metadata will be written
1067 * Note that there is the case where we do not want to update the
1068 * metadata when the saved metadata is being parsed in userspace
1069 * when setting the existing port access state and access status.
1071 * Also note that the failure to write out the ALUA metadata to
1072 * struct file does NOT affect the actual ALUA transition.
1074 if (tg_pt_gp->tg_pt_gp_write_metadata) {
1075 core_alua_update_tpg_primary_metadata(tg_pt_gp);
1078 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1079 " from primary access state %s to %s\n", (explicit) ? "explicit" :
1080 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1081 tg_pt_gp->tg_pt_gp_id,
1082 core_alua_dump_state(prev_state),
1083 core_alua_dump_state(new_state));
1085 core_alua_queue_state_change_ua(tg_pt_gp);
1087 mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
1091 int core_alua_do_port_transition(
1092 struct t10_alua_tg_pt_gp *l_tg_pt_gp,
1093 struct se_device *l_dev,
1094 struct se_lun *l_lun,
1095 struct se_node_acl *l_nacl,
1099 struct se_device *dev;
1100 struct t10_alua_lu_gp *lu_gp;
1101 struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
1102 struct t10_alua_tg_pt_gp *tg_pt_gp;
1103 int primary, valid_states, rc = 0;
1105 if (l_dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA)
1108 valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
1109 if (core_alua_check_transition(new_state, valid_states, &primary,
1113 local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
1114 spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
1115 lu_gp = local_lu_gp_mem->lu_gp;
1116 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1117 spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
1119 * For storage objects that are members of the 'default_lu_gp',
1120 * we only do transition on the passed *l_tp_pt_gp, and not
1121 * on all of the matching target port groups IDs in default_lu_gp.
1123 if (!lu_gp->lu_gp_id) {
1125 * core_alua_do_transition_tg_pt() will always return
1128 l_tg_pt_gp->tg_pt_gp_alua_lun = l_lun;
1129 l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1130 rc = core_alua_do_transition_tg_pt(l_tg_pt_gp,
1131 new_state, explicit);
1132 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1136 * For all other LU groups aside from 'default_lu_gp', walk all of
1137 * the associated storage objects looking for a matching target port
1138 * group ID from the local target port group.
1140 spin_lock(&lu_gp->lu_gp_lock);
1141 list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
1144 dev = lu_gp_mem->lu_gp_mem_dev;
1145 atomic_inc_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1146 spin_unlock(&lu_gp->lu_gp_lock);
1148 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1149 list_for_each_entry(tg_pt_gp,
1150 &dev->t10_alua.tg_pt_gps_list,
1153 if (!tg_pt_gp->tg_pt_gp_valid_id)
1156 * If the target behavior port asymmetric access state
1157 * is changed for any target port group accessible via
1158 * a logical unit within a LU group, the target port
1159 * behavior group asymmetric access states for the same
1160 * target port group accessible via other logical units
1161 * in that LU group will also change.
1163 if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
1166 if (l_tg_pt_gp == tg_pt_gp) {
1167 tg_pt_gp->tg_pt_gp_alua_lun = l_lun;
1168 tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
1170 tg_pt_gp->tg_pt_gp_alua_lun = NULL;
1171 tg_pt_gp->tg_pt_gp_alua_nacl = NULL;
1173 atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1174 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1176 * core_alua_do_transition_tg_pt() will always return
1179 rc = core_alua_do_transition_tg_pt(tg_pt_gp,
1180 new_state, explicit);
1182 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1183 atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
1187 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1189 spin_lock(&lu_gp->lu_gp_lock);
1190 atomic_dec_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
1192 spin_unlock(&lu_gp->lu_gp_lock);
1195 pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
1196 " Group IDs: %hu %s transition to primary state: %s\n",
1197 config_item_name(&lu_gp->lu_gp_group.cg_item),
1198 l_tg_pt_gp->tg_pt_gp_id,
1199 (explicit) ? "explicit" : "implicit",
1200 core_alua_dump_state(new_state));
1203 atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
1207 static int core_alua_update_tpg_secondary_metadata(struct se_lun *lun)
1209 struct se_portal_group *se_tpg = lun->lun_tpg;
1210 unsigned char *md_buf;
1211 char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN];
1214 mutex_lock(&lun->lun_tg_pt_md_mutex);
1216 md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
1218 pr_err("Unable to allocate buf for ALUA metadata\n");
1223 memset(path, 0, ALUA_METADATA_PATH_LEN);
1224 memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN);
1226 len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s",
1227 se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg));
1229 if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL)
1230 snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu",
1231 se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
1233 len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n"
1234 "alua_tg_pt_status=0x%02x\n",
1235 atomic_read(&lun->lun_tg_pt_secondary_offline),
1236 lun->lun_tg_pt_secondary_stat);
1238 snprintf(path, ALUA_METADATA_PATH_LEN, "%s/alua/%s/%s/lun_%llu",
1239 db_root, se_tpg->se_tpg_tfo->get_fabric_name(), wwn,
1242 rc = core_alua_write_tpg_metadata(path, md_buf, len);
1246 mutex_unlock(&lun->lun_tg_pt_md_mutex);
1250 static int core_alua_set_tg_pt_secondary_state(
1255 struct t10_alua_tg_pt_gp *tg_pt_gp;
1256 int trans_delay_msecs;
1258 spin_lock(&lun->lun_tg_pt_gp_lock);
1259 tg_pt_gp = lun->lun_tg_pt_gp;
1261 spin_unlock(&lun->lun_tg_pt_gp_lock);
1262 pr_err("Unable to complete secondary state"
1266 trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
1268 * Set the secondary ALUA target port access state to OFFLINE
1269 * or release the previously secondary state for struct se_lun
1272 atomic_set(&lun->lun_tg_pt_secondary_offline, 1);
1274 atomic_set(&lun->lun_tg_pt_secondary_offline, 0);
1276 lun->lun_tg_pt_secondary_stat = (explicit) ?
1277 ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
1278 ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
1280 pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
1281 " to secondary access state: %s\n", (explicit) ? "explicit" :
1282 "implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
1283 tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
1285 spin_unlock(&lun->lun_tg_pt_gp_lock);
1287 * Do the optional transition delay after we set the secondary
1288 * ALUA access state.
1290 if (trans_delay_msecs != 0)
1291 msleep_interruptible(trans_delay_msecs);
1293 * See if we need to update the ALUA fabric port metadata for
1294 * secondary state and status
1296 if (lun->lun_tg_pt_secondary_write_md)
1297 core_alua_update_tpg_secondary_metadata(lun);
1302 struct t10_alua_lba_map *
1303 core_alua_allocate_lba_map(struct list_head *list,
1304 u64 first_lba, u64 last_lba)
1306 struct t10_alua_lba_map *lba_map;
1308 lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL);
1310 pr_err("Unable to allocate struct t10_alua_lba_map\n");
1311 return ERR_PTR(-ENOMEM);
1313 INIT_LIST_HEAD(&lba_map->lba_map_mem_list);
1314 lba_map->lba_map_first_lba = first_lba;
1315 lba_map->lba_map_last_lba = last_lba;
1317 list_add_tail(&lba_map->lba_map_list, list);
1322 core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map,
1323 int pg_id, int state)
1325 struct t10_alua_lba_map_member *lba_map_mem;
1327 list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list,
1329 if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) {
1330 pr_err("Duplicate pg_id %d in lba_map\n", pg_id);
1335 lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL);
1337 pr_err("Unable to allocate struct t10_alua_lba_map_mem\n");
1340 lba_map_mem->lba_map_mem_alua_state = state;
1341 lba_map_mem->lba_map_mem_alua_pg_id = pg_id;
1343 list_add_tail(&lba_map_mem->lba_map_mem_list,
1344 &lba_map->lba_map_mem_list);
1349 core_alua_free_lba_map(struct list_head *lba_list)
1351 struct t10_alua_lba_map *lba_map, *lba_map_tmp;
1352 struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp;
1354 list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list,
1356 list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp,
1357 &lba_map->lba_map_mem_list,
1359 list_del(&lba_map_mem->lba_map_mem_list);
1360 kmem_cache_free(t10_alua_lba_map_mem_cache,
1363 list_del(&lba_map->lba_map_list);
1364 kmem_cache_free(t10_alua_lba_map_cache, lba_map);
1369 core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list,
1370 int segment_size, int segment_mult)
1372 struct list_head old_lba_map_list;
1373 struct t10_alua_tg_pt_gp *tg_pt_gp;
1374 int activate = 0, supported;
1376 INIT_LIST_HEAD(&old_lba_map_list);
1377 spin_lock(&dev->t10_alua.lba_map_lock);
1378 dev->t10_alua.lba_map_segment_size = segment_size;
1379 dev->t10_alua.lba_map_segment_multiplier = segment_mult;
1380 list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list);
1382 list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list);
1385 spin_unlock(&dev->t10_alua.lba_map_lock);
1386 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1387 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1390 if (!tg_pt_gp->tg_pt_gp_valid_id)
1392 supported = tg_pt_gp->tg_pt_gp_alua_supported_states;
1394 supported |= ALUA_LBD_SUP;
1396 supported &= ~ALUA_LBD_SUP;
1397 tg_pt_gp->tg_pt_gp_alua_supported_states = supported;
1399 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1400 core_alua_free_lba_map(&old_lba_map_list);
1403 struct t10_alua_lu_gp *
1404 core_alua_allocate_lu_gp(const char *name, int def_group)
1406 struct t10_alua_lu_gp *lu_gp;
1408 lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
1410 pr_err("Unable to allocate struct t10_alua_lu_gp\n");
1411 return ERR_PTR(-ENOMEM);
1413 INIT_LIST_HEAD(&lu_gp->lu_gp_node);
1414 INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
1415 spin_lock_init(&lu_gp->lu_gp_lock);
1416 atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
1419 lu_gp->lu_gp_id = alua_lu_gps_counter++;
1420 lu_gp->lu_gp_valid_id = 1;
1421 alua_lu_gps_count++;
1427 int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
1429 struct t10_alua_lu_gp *lu_gp_tmp;
1432 * The lu_gp->lu_gp_id may only be set once..
1434 if (lu_gp->lu_gp_valid_id) {
1435 pr_warn("ALUA LU Group already has a valid ID,"
1436 " ignoring request\n");
1440 spin_lock(&lu_gps_lock);
1441 if (alua_lu_gps_count == 0x0000ffff) {
1442 pr_err("Maximum ALUA alua_lu_gps_count:"
1443 " 0x0000ffff reached\n");
1444 spin_unlock(&lu_gps_lock);
1445 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1449 lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
1450 alua_lu_gps_counter++;
1452 list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
1453 if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
1457 pr_warn("ALUA Logical Unit Group ID: %hu"
1458 " already exists, ignoring request\n",
1460 spin_unlock(&lu_gps_lock);
1465 lu_gp->lu_gp_id = lu_gp_id_tmp;
1466 lu_gp->lu_gp_valid_id = 1;
1467 list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
1468 alua_lu_gps_count++;
1469 spin_unlock(&lu_gps_lock);
1474 static struct t10_alua_lu_gp_member *
1475 core_alua_allocate_lu_gp_mem(struct se_device *dev)
1477 struct t10_alua_lu_gp_member *lu_gp_mem;
1479 lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
1481 pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
1482 return ERR_PTR(-ENOMEM);
1484 INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
1485 spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
1486 atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
1488 lu_gp_mem->lu_gp_mem_dev = dev;
1489 dev->dev_alua_lu_gp_mem = lu_gp_mem;
1494 void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
1496 struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
1498 * Once we have reached this point, config_item_put() has
1499 * already been called from target_core_alua_drop_lu_gp().
1501 * Here, we remove the *lu_gp from the global list so that
1502 * no associations can be made while we are releasing
1503 * struct t10_alua_lu_gp.
1505 spin_lock(&lu_gps_lock);
1506 list_del(&lu_gp->lu_gp_node);
1507 alua_lu_gps_count--;
1508 spin_unlock(&lu_gps_lock);
1510 * Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
1511 * in target_core_configfs.c:target_core_store_alua_lu_gp() to be
1512 * released with core_alua_put_lu_gp_from_name()
1514 while (atomic_read(&lu_gp->lu_gp_ref_cnt))
1517 * Release reference to struct t10_alua_lu_gp * from all associated
1520 spin_lock(&lu_gp->lu_gp_lock);
1521 list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
1522 &lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
1523 if (lu_gp_mem->lu_gp_assoc) {
1524 list_del(&lu_gp_mem->lu_gp_mem_list);
1525 lu_gp->lu_gp_members--;
1526 lu_gp_mem->lu_gp_assoc = 0;
1528 spin_unlock(&lu_gp->lu_gp_lock);
1531 * lu_gp_mem is associated with a single
1532 * struct se_device->dev_alua_lu_gp_mem, and is released when
1533 * struct se_device is released via core_alua_free_lu_gp_mem().
1535 * If the passed lu_gp does NOT match the default_lu_gp, assume
1536 * we want to re-associate a given lu_gp_mem with default_lu_gp.
1538 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1539 if (lu_gp != default_lu_gp)
1540 __core_alua_attach_lu_gp_mem(lu_gp_mem,
1543 lu_gp_mem->lu_gp = NULL;
1544 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1546 spin_lock(&lu_gp->lu_gp_lock);
1548 spin_unlock(&lu_gp->lu_gp_lock);
1550 kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
1553 void core_alua_free_lu_gp_mem(struct se_device *dev)
1555 struct t10_alua_lu_gp *lu_gp;
1556 struct t10_alua_lu_gp_member *lu_gp_mem;
1558 lu_gp_mem = dev->dev_alua_lu_gp_mem;
1562 while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
1565 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
1566 lu_gp = lu_gp_mem->lu_gp;
1568 spin_lock(&lu_gp->lu_gp_lock);
1569 if (lu_gp_mem->lu_gp_assoc) {
1570 list_del(&lu_gp_mem->lu_gp_mem_list);
1571 lu_gp->lu_gp_members--;
1572 lu_gp_mem->lu_gp_assoc = 0;
1574 spin_unlock(&lu_gp->lu_gp_lock);
1575 lu_gp_mem->lu_gp = NULL;
1577 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
1579 kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
1582 struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
1584 struct t10_alua_lu_gp *lu_gp;
1585 struct config_item *ci;
1587 spin_lock(&lu_gps_lock);
1588 list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
1589 if (!lu_gp->lu_gp_valid_id)
1591 ci = &lu_gp->lu_gp_group.cg_item;
1592 if (!strcmp(config_item_name(ci), name)) {
1593 atomic_inc(&lu_gp->lu_gp_ref_cnt);
1594 spin_unlock(&lu_gps_lock);
1598 spin_unlock(&lu_gps_lock);
1603 void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
1605 spin_lock(&lu_gps_lock);
1606 atomic_dec(&lu_gp->lu_gp_ref_cnt);
1607 spin_unlock(&lu_gps_lock);
1611 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1613 void __core_alua_attach_lu_gp_mem(
1614 struct t10_alua_lu_gp_member *lu_gp_mem,
1615 struct t10_alua_lu_gp *lu_gp)
1617 spin_lock(&lu_gp->lu_gp_lock);
1618 lu_gp_mem->lu_gp = lu_gp;
1619 lu_gp_mem->lu_gp_assoc = 1;
1620 list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
1621 lu_gp->lu_gp_members++;
1622 spin_unlock(&lu_gp->lu_gp_lock);
1626 * Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
1628 void __core_alua_drop_lu_gp_mem(
1629 struct t10_alua_lu_gp_member *lu_gp_mem,
1630 struct t10_alua_lu_gp *lu_gp)
1632 spin_lock(&lu_gp->lu_gp_lock);
1633 list_del(&lu_gp_mem->lu_gp_mem_list);
1634 lu_gp_mem->lu_gp = NULL;
1635 lu_gp_mem->lu_gp_assoc = 0;
1636 lu_gp->lu_gp_members--;
1637 spin_unlock(&lu_gp->lu_gp_lock);
1640 struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
1641 const char *name, int def_group)
1643 struct t10_alua_tg_pt_gp *tg_pt_gp;
1645 tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
1647 pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
1650 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
1651 INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_lun_list);
1652 mutex_init(&tg_pt_gp->tg_pt_gp_transition_mutex);
1653 spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
1654 atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
1655 tg_pt_gp->tg_pt_gp_dev = dev;
1656 tg_pt_gp->tg_pt_gp_alua_access_state =
1657 ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED;
1659 * Enable both explicit and implicit ALUA support by default
1661 tg_pt_gp->tg_pt_gp_alua_access_type =
1662 TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA;
1664 * Set the default Active/NonOptimized Delay in milliseconds
1666 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
1667 tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
1668 tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS;
1671 * Enable all supported states
1673 tg_pt_gp->tg_pt_gp_alua_supported_states =
1674 ALUA_T_SUP | ALUA_O_SUP |
1675 ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP;
1678 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1679 tg_pt_gp->tg_pt_gp_id =
1680 dev->t10_alua.alua_tg_pt_gps_counter++;
1681 tg_pt_gp->tg_pt_gp_valid_id = 1;
1682 dev->t10_alua.alua_tg_pt_gps_count++;
1683 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1684 &dev->t10_alua.tg_pt_gps_list);
1685 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1691 int core_alua_set_tg_pt_gp_id(
1692 struct t10_alua_tg_pt_gp *tg_pt_gp,
1695 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1696 struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
1697 u16 tg_pt_gp_id_tmp;
1700 * The tg_pt_gp->tg_pt_gp_id may only be set once..
1702 if (tg_pt_gp->tg_pt_gp_valid_id) {
1703 pr_warn("ALUA TG PT Group already has a valid ID,"
1704 " ignoring request\n");
1708 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1709 if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
1710 pr_err("Maximum ALUA alua_tg_pt_gps_count:"
1711 " 0x0000ffff reached\n");
1712 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1713 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1717 tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
1718 dev->t10_alua.alua_tg_pt_gps_counter++;
1720 list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list,
1722 if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
1726 pr_err("ALUA Target Port Group ID: %hu already"
1727 " exists, ignoring request\n", tg_pt_gp_id);
1728 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1733 tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
1734 tg_pt_gp->tg_pt_gp_valid_id = 1;
1735 list_add_tail(&tg_pt_gp->tg_pt_gp_list,
1736 &dev->t10_alua.tg_pt_gps_list);
1737 dev->t10_alua.alua_tg_pt_gps_count++;
1738 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1743 void core_alua_free_tg_pt_gp(
1744 struct t10_alua_tg_pt_gp *tg_pt_gp)
1746 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1747 struct se_lun *lun, *next;
1750 * Once we have reached this point, config_item_put() has already
1751 * been called from target_core_alua_drop_tg_pt_gp().
1753 * Here we remove *tg_pt_gp from the global list so that
1754 * no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS
1755 * can be made while we are releasing struct t10_alua_tg_pt_gp.
1757 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1758 list_del(&tg_pt_gp->tg_pt_gp_list);
1759 dev->t10_alua.alua_tg_pt_gps_counter--;
1760 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1763 * Allow a struct t10_alua_tg_pt_gp_member * referenced by
1764 * core_alua_get_tg_pt_gp_by_name() in
1765 * target_core_configfs.c:target_core_store_alua_tg_pt_gp()
1766 * to be released with core_alua_put_tg_pt_gp_from_name().
1768 while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
1772 * Release reference to struct t10_alua_tg_pt_gp from all associated
1775 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1776 list_for_each_entry_safe(lun, next,
1777 &tg_pt_gp->tg_pt_gp_lun_list, lun_tg_pt_gp_link) {
1778 list_del_init(&lun->lun_tg_pt_gp_link);
1779 tg_pt_gp->tg_pt_gp_members--;
1781 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1783 * If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
1784 * assume we want to re-associate a given tg_pt_gp_mem with
1787 spin_lock(&lun->lun_tg_pt_gp_lock);
1788 if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
1789 __target_attach_tg_pt_gp(lun,
1790 dev->t10_alua.default_tg_pt_gp);
1792 lun->lun_tg_pt_gp = NULL;
1793 spin_unlock(&lun->lun_tg_pt_gp_lock);
1795 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1797 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1799 kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
1802 static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
1803 struct se_device *dev, const char *name)
1805 struct t10_alua_tg_pt_gp *tg_pt_gp;
1806 struct config_item *ci;
1808 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1809 list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
1811 if (!tg_pt_gp->tg_pt_gp_valid_id)
1813 ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1814 if (!strcmp(config_item_name(ci), name)) {
1815 atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
1816 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1820 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1825 static void core_alua_put_tg_pt_gp_from_name(
1826 struct t10_alua_tg_pt_gp *tg_pt_gp)
1828 struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
1830 spin_lock(&dev->t10_alua.tg_pt_gps_lock);
1831 atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
1832 spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
1835 static void __target_attach_tg_pt_gp(struct se_lun *lun,
1836 struct t10_alua_tg_pt_gp *tg_pt_gp)
1838 struct se_dev_entry *se_deve;
1840 assert_spin_locked(&lun->lun_tg_pt_gp_lock);
1842 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1843 lun->lun_tg_pt_gp = tg_pt_gp;
1844 list_add_tail(&lun->lun_tg_pt_gp_link, &tg_pt_gp->tg_pt_gp_lun_list);
1845 tg_pt_gp->tg_pt_gp_members++;
1846 spin_lock(&lun->lun_deve_lock);
1847 list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link)
1848 core_scsi3_ua_allocate(se_deve, 0x3f,
1849 ASCQ_3FH_INQUIRY_DATA_HAS_CHANGED);
1850 spin_unlock(&lun->lun_deve_lock);
1851 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1854 void target_attach_tg_pt_gp(struct se_lun *lun,
1855 struct t10_alua_tg_pt_gp *tg_pt_gp)
1857 spin_lock(&lun->lun_tg_pt_gp_lock);
1858 __target_attach_tg_pt_gp(lun, tg_pt_gp);
1859 spin_unlock(&lun->lun_tg_pt_gp_lock);
1862 static void __target_detach_tg_pt_gp(struct se_lun *lun,
1863 struct t10_alua_tg_pt_gp *tg_pt_gp)
1865 assert_spin_locked(&lun->lun_tg_pt_gp_lock);
1867 spin_lock(&tg_pt_gp->tg_pt_gp_lock);
1868 list_del_init(&lun->lun_tg_pt_gp_link);
1869 tg_pt_gp->tg_pt_gp_members--;
1870 spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
1872 lun->lun_tg_pt_gp = NULL;
1875 void target_detach_tg_pt_gp(struct se_lun *lun)
1877 struct t10_alua_tg_pt_gp *tg_pt_gp;
1879 spin_lock(&lun->lun_tg_pt_gp_lock);
1880 tg_pt_gp = lun->lun_tg_pt_gp;
1882 __target_detach_tg_pt_gp(lun, tg_pt_gp);
1883 spin_unlock(&lun->lun_tg_pt_gp_lock);
1886 ssize_t core_alua_show_tg_pt_gp_info(struct se_lun *lun, char *page)
1888 struct config_item *tg_pt_ci;
1889 struct t10_alua_tg_pt_gp *tg_pt_gp;
1892 spin_lock(&lun->lun_tg_pt_gp_lock);
1893 tg_pt_gp = lun->lun_tg_pt_gp;
1895 tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
1896 len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
1897 " %hu\nTG Port Primary Access State: %s\nTG Port "
1898 "Primary Access Status: %s\nTG Port Secondary Access"
1899 " State: %s\nTG Port Secondary Access Status: %s\n",
1900 config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
1901 core_alua_dump_state(
1902 tg_pt_gp->tg_pt_gp_alua_access_state),
1903 core_alua_dump_status(
1904 tg_pt_gp->tg_pt_gp_alua_access_status),
1905 atomic_read(&lun->lun_tg_pt_secondary_offline) ?
1907 core_alua_dump_status(lun->lun_tg_pt_secondary_stat));
1909 spin_unlock(&lun->lun_tg_pt_gp_lock);
1914 ssize_t core_alua_store_tg_pt_gp_info(
1919 struct se_portal_group *tpg = lun->lun_tpg;
1921 * rcu_dereference_raw protected by se_lun->lun_group symlink
1922 * reference to se_device->dev_group.
1924 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
1925 struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
1926 unsigned char buf[TG_PT_GROUP_NAME_BUF];
1929 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA ||
1930 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
1933 if (count > TG_PT_GROUP_NAME_BUF) {
1934 pr_err("ALUA Target Port Group alias too large!\n");
1937 memset(buf, 0, TG_PT_GROUP_NAME_BUF);
1938 memcpy(buf, page, count);
1940 * Any ALUA target port group alias besides "NULL" means we will be
1941 * making a new group association.
1943 if (strcmp(strstrip(buf), "NULL")) {
1945 * core_alua_get_tg_pt_gp_by_name() will increment reference to
1946 * struct t10_alua_tg_pt_gp. This reference is released with
1947 * core_alua_put_tg_pt_gp_from_name() below.
1949 tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev,
1955 spin_lock(&lun->lun_tg_pt_gp_lock);
1956 tg_pt_gp = lun->lun_tg_pt_gp;
1959 * Clearing an existing tg_pt_gp association, and replacing
1960 * with the default_tg_pt_gp.
1962 if (!tg_pt_gp_new) {
1963 pr_debug("Target_Core_ConfigFS: Moving"
1964 " %s/tpgt_%hu/%s from ALUA Target Port Group:"
1965 " alua/%s, ID: %hu back to"
1966 " default_tg_pt_gp\n",
1967 tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1968 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1969 config_item_name(&lun->lun_group.cg_item),
1971 &tg_pt_gp->tg_pt_gp_group.cg_item),
1972 tg_pt_gp->tg_pt_gp_id);
1974 __target_detach_tg_pt_gp(lun, tg_pt_gp);
1975 __target_attach_tg_pt_gp(lun,
1976 dev->t10_alua.default_tg_pt_gp);
1977 spin_unlock(&lun->lun_tg_pt_gp_lock);
1981 __target_detach_tg_pt_gp(lun, tg_pt_gp);
1985 __target_attach_tg_pt_gp(lun, tg_pt_gp_new);
1986 spin_unlock(&lun->lun_tg_pt_gp_lock);
1987 pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
1988 " Target Port Group: alua/%s, ID: %hu\n", (move) ?
1989 "Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
1990 tpg->se_tpg_tfo->tpg_get_tag(tpg),
1991 config_item_name(&lun->lun_group.cg_item),
1992 config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
1993 tg_pt_gp_new->tg_pt_gp_id);
1995 core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
1999 ssize_t core_alua_show_access_type(
2000 struct t10_alua_tg_pt_gp *tg_pt_gp,
2003 if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) &&
2004 (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA))
2005 return sprintf(page, "Implicit and Explicit\n");
2006 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)
2007 return sprintf(page, "Implicit\n");
2008 else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)
2009 return sprintf(page, "Explicit\n");
2011 return sprintf(page, "None\n");
2014 ssize_t core_alua_store_access_type(
2015 struct t10_alua_tg_pt_gp *tg_pt_gp,
2022 ret = kstrtoul(page, 0, &tmp);
2024 pr_err("Unable to extract alua_access_type\n");
2027 if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
2028 pr_err("Illegal value for alua_access_type:"
2033 tg_pt_gp->tg_pt_gp_alua_access_type =
2034 TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA;
2036 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA;
2038 tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA;
2040 tg_pt_gp->tg_pt_gp_alua_access_type = 0;
2045 ssize_t core_alua_show_nonop_delay_msecs(
2046 struct t10_alua_tg_pt_gp *tg_pt_gp,
2049 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
2052 ssize_t core_alua_store_nonop_delay_msecs(
2053 struct t10_alua_tg_pt_gp *tg_pt_gp,
2060 ret = kstrtoul(page, 0, &tmp);
2062 pr_err("Unable to extract nonop_delay_msecs\n");
2065 if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
2066 pr_err("Passed nonop_delay_msecs: %lu, exceeds"
2067 " ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
2068 ALUA_MAX_NONOP_DELAY_MSECS);
2071 tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
2076 ssize_t core_alua_show_trans_delay_msecs(
2077 struct t10_alua_tg_pt_gp *tg_pt_gp,
2080 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
2083 ssize_t core_alua_store_trans_delay_msecs(
2084 struct t10_alua_tg_pt_gp *tg_pt_gp,
2091 ret = kstrtoul(page, 0, &tmp);
2093 pr_err("Unable to extract trans_delay_msecs\n");
2096 if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
2097 pr_err("Passed trans_delay_msecs: %lu, exceeds"
2098 " ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
2099 ALUA_MAX_TRANS_DELAY_MSECS);
2102 tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
2107 ssize_t core_alua_show_implicit_trans_secs(
2108 struct t10_alua_tg_pt_gp *tg_pt_gp,
2111 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs);
2114 ssize_t core_alua_store_implicit_trans_secs(
2115 struct t10_alua_tg_pt_gp *tg_pt_gp,
2122 ret = kstrtoul(page, 0, &tmp);
2124 pr_err("Unable to extract implicit_trans_secs\n");
2127 if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) {
2128 pr_err("Passed implicit_trans_secs: %lu, exceeds"
2129 " ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp,
2130 ALUA_MAX_IMPLICIT_TRANS_SECS);
2133 tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp;
2138 ssize_t core_alua_show_preferred_bit(
2139 struct t10_alua_tg_pt_gp *tg_pt_gp,
2142 return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
2145 ssize_t core_alua_store_preferred_bit(
2146 struct t10_alua_tg_pt_gp *tg_pt_gp,
2153 ret = kstrtoul(page, 0, &tmp);
2155 pr_err("Unable to extract preferred ALUA value\n");
2158 if ((tmp != 0) && (tmp != 1)) {
2159 pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
2162 tg_pt_gp->tg_pt_gp_pref = (int)tmp;
2167 ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
2169 return sprintf(page, "%d\n",
2170 atomic_read(&lun->lun_tg_pt_secondary_offline));
2173 ssize_t core_alua_store_offline_bit(
2179 * rcu_dereference_raw protected by se_lun->lun_group symlink
2180 * reference to se_device->dev_group.
2182 struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
2186 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA ||
2187 (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
2190 ret = kstrtoul(page, 0, &tmp);
2192 pr_err("Unable to extract alua_tg_pt_offline value\n");
2195 if ((tmp != 0) && (tmp != 1)) {
2196 pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
2201 ret = core_alua_set_tg_pt_secondary_state(lun, 0, (int)tmp);
2208 ssize_t core_alua_show_secondary_status(
2212 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_stat);
2215 ssize_t core_alua_store_secondary_status(
2223 ret = kstrtoul(page, 0, &tmp);
2225 pr_err("Unable to extract alua_tg_pt_status\n");
2228 if ((tmp != ALUA_STATUS_NONE) &&
2229 (tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
2230 (tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
2231 pr_err("Illegal value for alua_tg_pt_status: %lu\n",
2235 lun->lun_tg_pt_secondary_stat = (int)tmp;
2240 ssize_t core_alua_show_secondary_write_metadata(
2244 return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_write_md);
2247 ssize_t core_alua_store_secondary_write_metadata(
2255 ret = kstrtoul(page, 0, &tmp);
2257 pr_err("Unable to extract alua_tg_pt_write_md\n");
2260 if ((tmp != 0) && (tmp != 1)) {
2261 pr_err("Illegal value for alua_tg_pt_write_md:"
2265 lun->lun_tg_pt_secondary_write_md = (int)tmp;
2270 int core_setup_alua(struct se_device *dev)
2272 if (!(dev->transport->transport_flags &
2273 TRANSPORT_FLAG_PASSTHROUGH_ALUA) &&
2274 !(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
2275 struct t10_alua_lu_gp_member *lu_gp_mem;
2278 * Associate this struct se_device with the default ALUA
2281 lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
2282 if (IS_ERR(lu_gp_mem))
2283 return PTR_ERR(lu_gp_mem);
2285 spin_lock(&lu_gp_mem->lu_gp_mem_lock);
2286 __core_alua_attach_lu_gp_mem(lu_gp_mem,
2288 spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
2290 pr_debug("%s: Adding to default ALUA LU Group:"
2291 " core/alua/lu_gps/default_lu_gp\n",
2292 dev->transport->name);