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linux/drivers/target/target_core_alua.c

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/*******************************************************************************
* Filename: target_core_alua.c
*
* This file contains SPC-3 compliant asymmetric logical unit assigntment (ALUA)
*
* (c) Copyright 2009-2013 Datera, Inc.
*
* Nicholas A. Bellinger <nab@kernel.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
******************************************************************************/
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/configfs.h>
#include <linux/delay.h>
#include <linux/export.h>
#include <linux/fcntl.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <scsi/scsi_proto.h>
#include <asm/unaligned.h>
#include <target/target_core_base.h>
#include <target/target_core_backend.h>
#include <target/target_core_fabric.h>
#include "target_core_internal.h"
#include "target_core_alua.h"
#include "target_core_ua.h"
static sense_reason_t core_alua_check_transition(int state, int valid,
int *primary, int explicit);
static int core_alua_set_tg_pt_secondary_state(
struct se_lun *lun, int explicit, int offline);
static char *core_alua_dump_state(int state);
static void __target_attach_tg_pt_gp(struct se_lun *lun,
struct t10_alua_tg_pt_gp *tg_pt_gp);
static u16 alua_lu_gps_counter;
static u32 alua_lu_gps_count;
static DEFINE_SPINLOCK(lu_gps_lock);
static LIST_HEAD(lu_gps_list);
struct t10_alua_lu_gp *default_lu_gp;
/*
* REPORT REFERRALS
*
* See sbc3r35 section 5.23
*/
sense_reason_t
target_emulate_report_referrals(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
struct t10_alua_lba_map *map;
struct t10_alua_lba_map_member *map_mem;
unsigned char *buf;
u32 rd_len = 0, off;
if (cmd->data_length < 4) {
pr_warn("REPORT REFERRALS allocation length %u too"
" small\n", cmd->data_length);
return TCM_INVALID_CDB_FIELD;
}
buf = transport_kmap_data_sg(cmd);
if (!buf)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
off = 4;
spin_lock(&dev->t10_alua.lba_map_lock);
if (list_empty(&dev->t10_alua.lba_map_list)) {
spin_unlock(&dev->t10_alua.lba_map_lock);
transport_kunmap_data_sg(cmd);
return TCM_UNSUPPORTED_SCSI_OPCODE;
}
list_for_each_entry(map, &dev->t10_alua.lba_map_list,
lba_map_list) {
int desc_num = off + 3;
int pg_num;
off += 4;
if (cmd->data_length > off)
put_unaligned_be64(map->lba_map_first_lba, &buf[off]);
off += 8;
if (cmd->data_length > off)
put_unaligned_be64(map->lba_map_last_lba, &buf[off]);
off += 8;
rd_len += 20;
pg_num = 0;
list_for_each_entry(map_mem, &map->lba_map_mem_list,
lba_map_mem_list) {
int alua_state = map_mem->lba_map_mem_alua_state;
int alua_pg_id = map_mem->lba_map_mem_alua_pg_id;
if (cmd->data_length > off)
buf[off] = alua_state & 0x0f;
off += 2;
if (cmd->data_length > off)
buf[off] = (alua_pg_id >> 8) & 0xff;
off++;
if (cmd->data_length > off)
buf[off] = (alua_pg_id & 0xff);
off++;
rd_len += 4;
pg_num++;
}
if (cmd->data_length > desc_num)
buf[desc_num] = pg_num;
}
spin_unlock(&dev->t10_alua.lba_map_lock);
/*
* Set the RETURN DATA LENGTH set in the header of the DataIN Payload
*/
put_unaligned_be16(rd_len, &buf[2]);
transport_kunmap_data_sg(cmd);
target_complete_cmd(cmd, GOOD);
return 0;
}
/*
* REPORT_TARGET_PORT_GROUPS
*
* See spc4r17 section 6.27
*/
sense_reason_t
target_emulate_report_target_port_groups(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
struct t10_alua_tg_pt_gp *tg_pt_gp;
struct se_lun *lun;
unsigned char *buf;
u32 rd_len = 0, off;
int ext_hdr = (cmd->t_task_cdb[1] & 0x20);
/*
* Skip over RESERVED area to first Target port group descriptor
* depending on the PARAMETER DATA FORMAT type..
*/
if (ext_hdr != 0)
off = 8;
else
off = 4;
if (cmd->data_length < off) {
pr_warn("REPORT TARGET PORT GROUPS allocation length %u too"
" small for %s header\n", cmd->data_length,
(ext_hdr) ? "extended" : "normal");
return TCM_INVALID_CDB_FIELD;
}
buf = transport_kmap_data_sg(cmd);
if (!buf)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
spin_lock(&dev->t10_alua.tg_pt_gps_lock);
list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
tg_pt_gp_list) {
/*
* Check if the Target port group and Target port descriptor list
* based on tg_pt_gp_members count will fit into the response payload.
* Otherwise, bump rd_len to let the initiator know we have exceeded
* the allocation length and the response is truncated.
*/
if ((off + 8 + (tg_pt_gp->tg_pt_gp_members * 4)) >
cmd->data_length) {
rd_len += 8 + (tg_pt_gp->tg_pt_gp_members * 4);
continue;
}
/*
* PREF: Preferred target port bit, determine if this
* bit should be set for port group.
*/
if (tg_pt_gp->tg_pt_gp_pref)
buf[off] = 0x80;
/*
* Set the ASYMMETRIC ACCESS State
*/
buf[off++] |= tg_pt_gp->tg_pt_gp_alua_access_state & 0xff;
/*
* Set supported ASYMMETRIC ACCESS State bits
*/
buf[off++] |= tg_pt_gp->tg_pt_gp_alua_supported_states;
/*
* TARGET PORT GROUP
*/
put_unaligned_be16(tg_pt_gp->tg_pt_gp_id, &buf[off]);
off += 2;
off++; /* Skip over Reserved */
/*
* STATUS CODE
*/
buf[off++] = (tg_pt_gp->tg_pt_gp_alua_access_status & 0xff);
/*
* Vendor Specific field
*/
buf[off++] = 0x00;
/*
* TARGET PORT COUNT
*/
buf[off++] = (tg_pt_gp->tg_pt_gp_members & 0xff);
rd_len += 8;
spin_lock(&tg_pt_gp->tg_pt_gp_lock);
list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
lun_tg_pt_gp_link) {
/*
* Start Target Port descriptor format
*
* See spc4r17 section 6.2.7 Table 247
*/
off += 2; /* Skip over Obsolete */
/*
* Set RELATIVE TARGET PORT IDENTIFIER
*/
put_unaligned_be16(lun->lun_rtpi, &buf[off]);
off += 2;
rd_len += 4;
}
spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
}
spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
/*
* Set the RETURN DATA LENGTH set in the header of the DataIN Payload
*/
put_unaligned_be32(rd_len, &buf[0]);
/*
* Fill in the Extended header parameter data format if requested
*/
if (ext_hdr != 0) {
buf[4] = 0x10;
/*
* Set the implicit transition time (in seconds) for the application
* client to use as a base for it's transition timeout value.
*
* Use the current tg_pt_gp_mem -> tg_pt_gp membership from the LUN
* this CDB was received upon to determine this value individually
* for ALUA target port group.
*/
spin_lock(&cmd->se_lun->lun_tg_pt_gp_lock);
tg_pt_gp = cmd->se_lun->lun_tg_pt_gp;
if (tg_pt_gp)
buf[5] = tg_pt_gp->tg_pt_gp_implicit_trans_secs;
spin_unlock(&cmd->se_lun->lun_tg_pt_gp_lock);
}
transport_kunmap_data_sg(cmd);
target_complete_cmd_with_length(cmd, GOOD, rd_len + 4);
return 0;
}
/*
* SET_TARGET_PORT_GROUPS for explicit ALUA operation.
*
* See spc4r17 section 6.35
*/
sense_reason_t
target_emulate_set_target_port_groups(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
struct se_lun *l_lun = cmd->se_lun;
struct se_node_acl *nacl = cmd->se_sess->se_node_acl;
struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *l_tg_pt_gp;
unsigned char *buf;
unsigned char *ptr;
sense_reason_t rc = TCM_NO_SENSE;
u32 len = 4; /* Skip over RESERVED area in header */
int alua_access_state, primary = 0, valid_states;
u16 tg_pt_id, rtpi;
if (cmd->data_length < 4) {
pr_warn("SET TARGET PORT GROUPS parameter list length %u too"
" small\n", cmd->data_length);
return TCM_INVALID_PARAMETER_LIST;
}
buf = transport_kmap_data_sg(cmd);
if (!buf)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
/*
* Determine if explicit ALUA via SET_TARGET_PORT_GROUPS is allowed
* for the local tg_pt_gp.
*/
spin_lock(&l_lun->lun_tg_pt_gp_lock);
l_tg_pt_gp = l_lun->lun_tg_pt_gp;
if (!l_tg_pt_gp) {
spin_unlock(&l_lun->lun_tg_pt_gp_lock);
pr_err("Unable to access l_lun->tg_pt_gp\n");
rc = TCM_UNSUPPORTED_SCSI_OPCODE;
goto out;
}
if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) {
spin_unlock(&l_lun->lun_tg_pt_gp_lock);
pr_debug("Unable to process SET_TARGET_PORT_GROUPS"
" while TPGS_EXPLICIT_ALUA is disabled\n");
rc = TCM_UNSUPPORTED_SCSI_OPCODE;
goto out;
}
valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
spin_unlock(&l_lun->lun_tg_pt_gp_lock);
ptr = &buf[4]; /* Skip over RESERVED area in header */
while (len < cmd->data_length) {
bool found = false;
alua_access_state = (ptr[0] & 0x0f);
/*
* Check the received ALUA access state, and determine if
* the state is a primary or secondary target port asymmetric
* access state.
*/
rc = core_alua_check_transition(alua_access_state, valid_states,
&primary, 1);
if (rc) {
/*
* If the SET TARGET PORT GROUPS attempts to establish
* an invalid combination of target port asymmetric
* access states or attempts to establish an
* unsupported target port asymmetric access state,
* then the command shall be terminated with CHECK
* CONDITION status, with the sense key set to ILLEGAL
* REQUEST, and the additional sense code set to INVALID
* FIELD IN PARAMETER LIST.
*/
goto out;
}
/*
* If the ASYMMETRIC ACCESS STATE field (see table 267)
* specifies a primary target port asymmetric access state,
* then the TARGET PORT GROUP OR TARGET PORT field specifies
* a primary target port group for which the primary target
* port asymmetric access state shall be changed. If the
* ASYMMETRIC ACCESS STATE field specifies a secondary target
* port asymmetric access state, then the TARGET PORT GROUP OR
* TARGET PORT field specifies the relative target port
* identifier (see 3.1.120) of the target port for which the
* secondary target port asymmetric access state shall be
* changed.
*/
if (primary) {
tg_pt_id = get_unaligned_be16(ptr + 2);
/*
* Locate the matching target port group ID from
* the global tg_pt_gp list
*/
spin_lock(&dev->t10_alua.tg_pt_gps_lock);
list_for_each_entry(tg_pt_gp,
&dev->t10_alua.tg_pt_gps_list,
tg_pt_gp_list) {
if (!tg_pt_gp->tg_pt_gp_valid_id)
continue;
if (tg_pt_id != tg_pt_gp->tg_pt_gp_id)
continue;
atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
if (!core_alua_do_port_transition(tg_pt_gp,
dev, l_lun, nacl,
alua_access_state, 1))
found = true;
spin_lock(&dev->t10_alua.tg_pt_gps_lock);
atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
break;
}
spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
} else {
struct se_lun *lun;
/*
* Extract the RELATIVE TARGET PORT IDENTIFIER to identify
* the Target Port in question for the the incoming
* SET_TARGET_PORT_GROUPS op.
*/
rtpi = get_unaligned_be16(ptr + 2);
/*
* Locate the matching relative target port identifier
* for the struct se_device storage object.
*/
spin_lock(&dev->se_port_lock);
list_for_each_entry(lun, &dev->dev_sep_list,
lun_dev_link) {
if (lun->lun_rtpi != rtpi)
continue;
// XXX: racy unlock
spin_unlock(&dev->se_port_lock);
if (!core_alua_set_tg_pt_secondary_state(
lun, 1, 1))
found = true;
spin_lock(&dev->se_port_lock);
break;
}
spin_unlock(&dev->se_port_lock);
}
if (!found) {
rc = TCM_INVALID_PARAMETER_LIST;
goto out;
}
ptr += 4;
len += 4;
}
out:
transport_kunmap_data_sg(cmd);
if (!rc)
target_complete_cmd(cmd, GOOD);
return rc;
}
static inline void set_ascq(struct se_cmd *cmd, u8 alua_ascq)
{
/*
* Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
* The ALUA additional sense code qualifier (ASCQ) is determined
* by the ALUA primary or secondary access state..
*/
pr_debug("[%s]: ALUA TG Port not available, "
"SenseKey: NOT_READY, ASC/ASCQ: "
"0x04/0x%02x\n",
cmd->se_tfo->fabric_name, alua_ascq);
cmd->scsi_asc = 0x04;
cmd->scsi_ascq = alua_ascq;
}
static inline void core_alua_state_nonoptimized(
struct se_cmd *cmd,
unsigned char *cdb,
int nonop_delay_msecs)
{
/*
* Set SCF_ALUA_NON_OPTIMIZED here, this value will be checked
* later to determine if processing of this cmd needs to be
* temporarily delayed for the Active/NonOptimized primary access state.
*/
cmd->se_cmd_flags |= SCF_ALUA_NON_OPTIMIZED;
cmd->alua_nonop_delay = nonop_delay_msecs;
}
static inline int core_alua_state_lba_dependent(
struct se_cmd *cmd,
struct t10_alua_tg_pt_gp *tg_pt_gp)
{
struct se_device *dev = cmd->se_dev;
u64 segment_size, segment_mult, sectors, lba;
/* Only need to check for cdb actually containing LBAs */
if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB))
return 0;
spin_lock(&dev->t10_alua.lba_map_lock);
segment_size = dev->t10_alua.lba_map_segment_size;
segment_mult = dev->t10_alua.lba_map_segment_multiplier;
sectors = cmd->data_length / dev->dev_attrib.block_size;
lba = cmd->t_task_lba;
while (lba < cmd->t_task_lba + sectors) {
struct t10_alua_lba_map *cur_map = NULL, *map;
struct t10_alua_lba_map_member *map_mem;
list_for_each_entry(map, &dev->t10_alua.lba_map_list,
lba_map_list) {
u64 start_lba, last_lba;
u64 first_lba = map->lba_map_first_lba;
if (segment_mult) {
u64 tmp = lba;
start_lba = do_div(tmp, segment_size * segment_mult);
last_lba = first_lba + segment_size - 1;
if (start_lba >= first_lba &&
start_lba <= last_lba) {
lba += segment_size;
cur_map = map;
break;
}
} else {
last_lba = map->lba_map_last_lba;
if (lba >= first_lba && lba <= last_lba) {
lba = last_lba + 1;
cur_map = map;
break;
}
}
}
if (!cur_map) {
spin_unlock(&dev->t10_alua.lba_map_lock);
set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
return 1;
}
list_for_each_entry(map_mem, &cur_map->lba_map_mem_list,
lba_map_mem_list) {
if (map_mem->lba_map_mem_alua_pg_id !=
tg_pt_gp->tg_pt_gp_id)
continue;
switch(map_mem->lba_map_mem_alua_state) {
case ALUA_ACCESS_STATE_STANDBY:
spin_unlock(&dev->t10_alua.lba_map_lock);
set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
return 1;
case ALUA_ACCESS_STATE_UNAVAILABLE:
spin_unlock(&dev->t10_alua.lba_map_lock);
set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
return 1;
default:
break;
}
}
}
spin_unlock(&dev->t10_alua.lba_map_lock);
return 0;
}
static inline int core_alua_state_standby(
struct se_cmd *cmd,
unsigned char *cdb)
{
/*
* Allowed CDBs for ALUA_ACCESS_STATE_STANDBY as defined by
* spc4r17 section 5.9.2.4.4
*/
switch (cdb[0]) {
case INQUIRY:
case LOG_SELECT:
case LOG_SENSE:
case MODE_SELECT:
case MODE_SENSE:
case REPORT_LUNS:
case RECEIVE_DIAGNOSTIC:
case SEND_DIAGNOSTIC:
case READ_CAPACITY:
return 0;
case SERVICE_ACTION_IN_16:
switch (cdb[1] & 0x1f) {
case SAI_READ_CAPACITY_16:
return 0;
default:
set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
return 1;
}
case MAINTENANCE_IN:
switch (cdb[1] & 0x1f) {
case MI_REPORT_TARGET_PGS:
return 0;
default:
set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
return 1;
}
case MAINTENANCE_OUT:
switch (cdb[1]) {
case MO_SET_TARGET_PGS:
return 0;
default:
set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
return 1;
}
case REQUEST_SENSE:
case PERSISTENT_RESERVE_IN:
case PERSISTENT_RESERVE_OUT:
case READ_BUFFER:
case WRITE_BUFFER:
return 0;
default:
set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);
return 1;
}
return 0;
}
static inline int core_alua_state_unavailable(
struct se_cmd *cmd,
unsigned char *cdb)
{
/*
* Allowed CDBs for ALUA_ACCESS_STATE_UNAVAILABLE as defined by
* spc4r17 section 5.9.2.4.5
*/
switch (cdb[0]) {
case INQUIRY:
case REPORT_LUNS:
return 0;
case MAINTENANCE_IN:
switch (cdb[1] & 0x1f) {
case MI_REPORT_TARGET_PGS:
return 0;
default:
set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
return 1;
}
case MAINTENANCE_OUT:
switch (cdb[1]) {
case MO_SET_TARGET_PGS:
return 0;
default:
set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
return 1;
}
case REQUEST_SENSE:
case READ_BUFFER:
case WRITE_BUFFER:
return 0;
default:
set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_UNAVAILABLE);
return 1;
}
return 0;
}
static inline int core_alua_state_transition(
struct se_cmd *cmd,
unsigned char *cdb)
{
/*
* Allowed CDBs for ALUA_ACCESS_STATE_TRANSITION as defined by
* spc4r17 section 5.9.2.5
*/
switch (cdb[0]) {
case INQUIRY:
case REPORT_LUNS:
return 0;
case MAINTENANCE_IN:
switch (cdb[1] & 0x1f) {
case MI_REPORT_TARGET_PGS:
return 0;
default:
set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
return 1;
}
case REQUEST_SENSE:
case READ_BUFFER:
case WRITE_BUFFER:
return 0;
default:
set_ascq(cmd, ASCQ_04H_ALUA_STATE_TRANSITION);
return 1;
}
return 0;
}
/*
* return 1: Is used to signal LUN not accessible, and check condition/not ready
* return 0: Used to signal success
* return -1: Used to signal failure, and invalid cdb field
*/
sense_reason_t
target_alua_state_check(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
unsigned char *cdb = cmd->t_task_cdb;
struct se_lun *lun = cmd->se_lun;
struct t10_alua_tg_pt_gp *tg_pt_gp;
int out_alua_state, nonop_delay_msecs;
if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
return 0;
if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA)
return 0;
/*
* First, check for a struct se_port specific secondary ALUA target port
* access state: OFFLINE
*/
if (atomic_read(&lun->lun_tg_pt_secondary_offline)) {
pr_debug("ALUA: Got secondary offline status for local"
" target port\n");
set_ascq(cmd, ASCQ_04H_ALUA_OFFLINE);
return TCM_CHECK_CONDITION_NOT_READY;
}
if (!lun->lun_tg_pt_gp)
return 0;
spin_lock(&lun->lun_tg_pt_gp_lock);
tg_pt_gp = lun->lun_tg_pt_gp;
out_alua_state = tg_pt_gp->tg_pt_gp_alua_access_state;
nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
// XXX: keeps using tg_pt_gp witout reference after unlock
spin_unlock(&lun->lun_tg_pt_gp_lock);
/*
* Process ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED in a separate conditional
* statement so the compiler knows explicitly to check this case first.
* For the Optimized ALUA access state case, we want to process the
* incoming fabric cmd ASAP..
*/
if (out_alua_state == ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED)
return 0;
switch (out_alua_state) {
case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
core_alua_state_nonoptimized(cmd, cdb, nonop_delay_msecs);
break;
case ALUA_ACCESS_STATE_STANDBY:
if (core_alua_state_standby(cmd, cdb))
return TCM_CHECK_CONDITION_NOT_READY;
break;
case ALUA_ACCESS_STATE_UNAVAILABLE:
if (core_alua_state_unavailable(cmd, cdb))
return TCM_CHECK_CONDITION_NOT_READY;
break;
case ALUA_ACCESS_STATE_TRANSITION:
if (core_alua_state_transition(cmd, cdb))
return TCM_CHECK_CONDITION_NOT_READY;
break;
case ALUA_ACCESS_STATE_LBA_DEPENDENT:
if (core_alua_state_lba_dependent(cmd, tg_pt_gp))
return TCM_CHECK_CONDITION_NOT_READY;
break;
/*
* OFFLINE is a secondary ALUA target port group access state, that is
* handled above with struct se_lun->lun_tg_pt_secondary_offline=1
*/
case ALUA_ACCESS_STATE_OFFLINE:
default:
pr_err("Unknown ALUA access state: 0x%02x\n",
out_alua_state);
return TCM_INVALID_CDB_FIELD;
}
return 0;
}
/*
* Check implicit and explicit ALUA state change request.
*/
static sense_reason_t
core_alua_check_transition(int state, int valid, int *primary, int explicit)
{
/*
* OPTIMIZED, NON-OPTIMIZED, STANDBY and UNAVAILABLE are
* defined as primary target port asymmetric access states.
*/
switch (state) {
case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
if (!(valid & ALUA_AO_SUP))
goto not_supported;
*primary = 1;
break;
case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
if (!(valid & ALUA_AN_SUP))
goto not_supported;
*primary = 1;
break;
case ALUA_ACCESS_STATE_STANDBY:
if (!(valid & ALUA_S_SUP))
goto not_supported;
*primary = 1;
break;
case ALUA_ACCESS_STATE_UNAVAILABLE:
if (!(valid & ALUA_U_SUP))
goto not_supported;
*primary = 1;
break;
case ALUA_ACCESS_STATE_LBA_DEPENDENT:
if (!(valid & ALUA_LBD_SUP))
goto not_supported;
*primary = 1;
break;
case ALUA_ACCESS_STATE_OFFLINE:
/*
* OFFLINE state is defined as a secondary target port
* asymmetric access state.
*/
if (!(valid & ALUA_O_SUP))
goto not_supported;
*primary = 0;
break;
case ALUA_ACCESS_STATE_TRANSITION:
if (!(valid & ALUA_T_SUP) || explicit)
/*
* Transitioning is set internally and by tcmu daemon,
* and cannot be selected through a STPG.
*/
goto not_supported;
*primary = 0;
break;
default:
pr_err("Unknown ALUA access state: 0x%02x\n", state);
return TCM_INVALID_PARAMETER_LIST;
}
return 0;
not_supported:
pr_err("ALUA access state %s not supported",
core_alua_dump_state(state));
return TCM_INVALID_PARAMETER_LIST;
}
static char *core_alua_dump_state(int state)
{
switch (state) {
case ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED:
return "Active/Optimized";
case ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED:
return "Active/NonOptimized";
case ALUA_ACCESS_STATE_LBA_DEPENDENT:
return "LBA Dependent";
case ALUA_ACCESS_STATE_STANDBY:
return "Standby";
case ALUA_ACCESS_STATE_UNAVAILABLE:
return "Unavailable";
case ALUA_ACCESS_STATE_OFFLINE:
return "Offline";
case ALUA_ACCESS_STATE_TRANSITION:
return "Transitioning";
default:
return "Unknown";
}
return NULL;
}
char *core_alua_dump_status(int status)
{
switch (status) {
case ALUA_STATUS_NONE:
return "None";
case ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG:
return "Altered by Explicit STPG";
case ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA:
return "Altered by Implicit ALUA";
default:
return "Unknown";
}
return NULL;
}
/*
* Used by fabric modules to determine when we need to delay processing
* for the Active/NonOptimized paths..
*/
int core_alua_check_nonop_delay(
struct se_cmd *cmd)
{
if (!(cmd->se_cmd_flags & SCF_ALUA_NON_OPTIMIZED))
return 0;
if (in_interrupt())
return 0;
/*
* The ALUA Active/NonOptimized access state delay can be disabled
* in via configfs with a value of zero
*/
if (!cmd->alua_nonop_delay)
return 0;
/*
* struct se_cmd->alua_nonop_delay gets set by a target port group
* defined interval in core_alua_state_nonoptimized()
*/
msleep_interruptible(cmd->alua_nonop_delay);
return 0;
}
EXPORT_SYMBOL(core_alua_check_nonop_delay);
static int core_alua_write_tpg_metadata(
const char *path,
unsigned char *md_buf,
u32 md_buf_len)
{
struct file *file = filp_open(path, O_RDWR | O_CREAT | O_TRUNC, 0600);
loff_t pos = 0;
int ret;
if (IS_ERR(file)) {
pr_err("filp_open(%s) for ALUA metadata failed\n", path);
return -ENODEV;
}
ret = kernel_write(file, md_buf, md_buf_len, &pos);
if (ret < 0)
pr_err("Error writing ALUA metadata file: %s\n", path);
fput(file);
return (ret < 0) ? -EIO : 0;
}
static int core_alua_update_tpg_primary_metadata(
struct t10_alua_tg_pt_gp *tg_pt_gp)
{
unsigned char *md_buf;
struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn;
char *path;
int len, rc;
lockdep_assert_held(&tg_pt_gp->tg_pt_gp_transition_mutex);
md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
if (!md_buf) {
pr_err("Unable to allocate buf for ALUA metadata\n");
return -ENOMEM;
}
len = snprintf(md_buf, ALUA_MD_BUF_LEN,
"tg_pt_gp_id=%hu\n"
"alua_access_state=0x%02x\n"
"alua_access_status=0x%02x\n",
tg_pt_gp->tg_pt_gp_id,
tg_pt_gp->tg_pt_gp_alua_access_state,
tg_pt_gp->tg_pt_gp_alua_access_status);
rc = -ENOMEM;
path = kasprintf(GFP_KERNEL, "%s/alua/tpgs_%s/%s", db_root,
&wwn->unit_serial[0],
config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
if (path) {
rc = core_alua_write_tpg_metadata(path, md_buf, len);
kfree(path);
}
kfree(md_buf);
return rc;
}
static void core_alua_queue_state_change_ua(struct t10_alua_tg_pt_gp *tg_pt_gp)
{
struct se_dev_entry *se_deve;
struct se_lun *lun;
struct se_lun_acl *lacl;
spin_lock(&tg_pt_gp->tg_pt_gp_lock);
list_for_each_entry(lun, &tg_pt_gp->tg_pt_gp_lun_list,
lun_tg_pt_gp_link) {
/*
* After an implicit target port asymmetric access state
* change, a device server shall establish a unit attention
* condition for the initiator port associated with every I_T
* nexus with the additional sense code set to ASYMMETRIC
* ACCESS STATE CHANGED.
*
* After an explicit target port asymmetric access state
* change, a device server shall establish a unit attention
* condition with the additional sense code set to ASYMMETRIC
* ACCESS STATE CHANGED for the initiator port associated with
* every I_T nexus other than the I_T nexus on which the SET
* TARGET PORT GROUPS command
*/
if (!percpu_ref_tryget_live(&lun->lun_ref))
continue;
spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
spin_lock(&lun->lun_deve_lock);
list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link) {
lacl = rcu_dereference_check(se_deve->se_lun_acl,
lockdep_is_held(&lun->lun_deve_lock));
/*
* spc4r37 p.242:
* After an explicit target port asymmetric access
* state change, a device server shall establish a
* unit attention condition with the additional sense
* code set to ASYMMETRIC ACCESS STATE CHANGED for
* the initiator port associated with every I_T nexus
* other than the I_T nexus on which the SET TARGET
* PORT GROUPS command was received.
*/
if ((tg_pt_gp->tg_pt_gp_alua_access_status ==
ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
(tg_pt_gp->tg_pt_gp_alua_lun != NULL) &&
(tg_pt_gp->tg_pt_gp_alua_lun == lun))
continue;
/*
* se_deve->se_lun_acl pointer may be NULL for a
* entry created without explicit Node+MappedLUN ACLs
*/
if (lacl && (tg_pt_gp->tg_pt_gp_alua_nacl != NULL) &&
(tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl))
continue;
core_scsi3_ua_allocate(se_deve, 0x2A,
ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
}
spin_unlock(&lun->lun_deve_lock);
spin_lock(&tg_pt_gp->tg_pt_gp_lock);
percpu_ref_put(&lun->lun_ref);
}
spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
}
static int core_alua_do_transition_tg_pt(
struct t10_alua_tg_pt_gp *tg_pt_gp,
int new_state,
int explicit)
{
int prev_state;
mutex_lock(&tg_pt_gp->tg_pt_gp_transition_mutex);
/* Nothing to be done here */
if (tg_pt_gp->tg_pt_gp_alua_access_state == new_state) {
mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
return 0;
}
if (explicit && new_state == ALUA_ACCESS_STATE_TRANSITION) {
mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
return -EAGAIN;
}
/*
* Save the old primary ALUA access state, and set the current state
* to ALUA_ACCESS_STATE_TRANSITION.
*/
prev_state = tg_pt_gp->tg_pt_gp_alua_access_state;
tg_pt_gp->tg_pt_gp_alua_access_state = ALUA_ACCESS_STATE_TRANSITION;
tg_pt_gp->tg_pt_gp_alua_access_status = (explicit) ?
ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
core_alua_queue_state_change_ua(tg_pt_gp);
if (new_state == ALUA_ACCESS_STATE_TRANSITION) {
mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
return 0;
}
/*
* Check for the optional ALUA primary state transition delay
*/
if (tg_pt_gp->tg_pt_gp_trans_delay_msecs != 0)
msleep_interruptible(tg_pt_gp->tg_pt_gp_trans_delay_msecs);
/*
* Set the current primary ALUA access state to the requested new state
*/
tg_pt_gp->tg_pt_gp_alua_access_state = new_state;
/*
* Update the ALUA metadata buf that has been allocated in
* core_alua_do_port_transition(), this metadata will be written
* to struct file.
*
* Note that there is the case where we do not want to update the
* metadata when the saved metadata is being parsed in userspace
* when setting the existing port access state and access status.
*
* Also note that the failure to write out the ALUA metadata to
* struct file does NOT affect the actual ALUA transition.
*/
if (tg_pt_gp->tg_pt_gp_write_metadata) {
core_alua_update_tpg_primary_metadata(tg_pt_gp);
}
pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
" from primary access state %s to %s\n", (explicit) ? "explicit" :
"implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
tg_pt_gp->tg_pt_gp_id,
core_alua_dump_state(prev_state),
core_alua_dump_state(new_state));
core_alua_queue_state_change_ua(tg_pt_gp);
mutex_unlock(&tg_pt_gp->tg_pt_gp_transition_mutex);
return 0;
}
int core_alua_do_port_transition(
struct t10_alua_tg_pt_gp *l_tg_pt_gp,
struct se_device *l_dev,
struct se_lun *l_lun,
struct se_node_acl *l_nacl,
int new_state,
int explicit)
{
struct se_device *dev;
struct t10_alua_lu_gp *lu_gp;
struct t10_alua_lu_gp_member *lu_gp_mem, *local_lu_gp_mem;
struct t10_alua_tg_pt_gp *tg_pt_gp;
int primary, valid_states, rc = 0;
if (l_dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA)
return -ENODEV;
valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
if (core_alua_check_transition(new_state, valid_states, &primary,
explicit) != 0)
return -EINVAL;
local_lu_gp_mem = l_dev->dev_alua_lu_gp_mem;
spin_lock(&local_lu_gp_mem->lu_gp_mem_lock);
lu_gp = local_lu_gp_mem->lu_gp;
atomic_inc(&lu_gp->lu_gp_ref_cnt);
spin_unlock(&local_lu_gp_mem->lu_gp_mem_lock);
/*
* For storage objects that are members of the 'default_lu_gp',
* we only do transition on the passed *l_tp_pt_gp, and not
* on all of the matching target port groups IDs in default_lu_gp.
*/
if (!lu_gp->lu_gp_id) {
/*
* core_alua_do_transition_tg_pt() will always return
* success.
*/
l_tg_pt_gp->tg_pt_gp_alua_lun = l_lun;
l_tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
rc = core_alua_do_transition_tg_pt(l_tg_pt_gp,
new_state, explicit);
atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
return rc;
}
/*
* For all other LU groups aside from 'default_lu_gp', walk all of
* the associated storage objects looking for a matching target port
* group ID from the local target port group.
*/
spin_lock(&lu_gp->lu_gp_lock);
list_for_each_entry(lu_gp_mem, &lu_gp->lu_gp_mem_list,
lu_gp_mem_list) {
dev = lu_gp_mem->lu_gp_mem_dev;
atomic_inc_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
spin_unlock(&lu_gp->lu_gp_lock);
spin_lock(&dev->t10_alua.tg_pt_gps_lock);
list_for_each_entry(tg_pt_gp,
&dev->t10_alua.tg_pt_gps_list,
tg_pt_gp_list) {
if (!tg_pt_gp->tg_pt_gp_valid_id)
continue;
/*
* If the target behavior port asymmetric access state
* is changed for any target port group accessible via
* a logical unit within a LU group, the target port
* behavior group asymmetric access states for the same
* target port group accessible via other logical units
* in that LU group will also change.
*/
if (l_tg_pt_gp->tg_pt_gp_id != tg_pt_gp->tg_pt_gp_id)
continue;
if (l_tg_pt_gp == tg_pt_gp) {
tg_pt_gp->tg_pt_gp_alua_lun = l_lun;
tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
} else {
tg_pt_gp->tg_pt_gp_alua_lun = NULL;
tg_pt_gp->tg_pt_gp_alua_nacl = NULL;
}
atomic_inc_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
/*
* core_alua_do_transition_tg_pt() will always return
* success.
*/
rc = core_alua_do_transition_tg_pt(tg_pt_gp,
new_state, explicit);
spin_lock(&dev->t10_alua.tg_pt_gps_lock);
atomic_dec_mb(&tg_pt_gp->tg_pt_gp_ref_cnt);
if (rc)
break;
}
spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
spin_lock(&lu_gp->lu_gp_lock);
atomic_dec_mb(&lu_gp_mem->lu_gp_mem_ref_cnt);
}
spin_unlock(&lu_gp->lu_gp_lock);
if (!rc) {
pr_debug("Successfully processed LU Group: %s all ALUA TG PT"
" Group IDs: %hu %s transition to primary state: %s\n",
config_item_name(&lu_gp->lu_gp_group.cg_item),
l_tg_pt_gp->tg_pt_gp_id,
(explicit) ? "explicit" : "implicit",
core_alua_dump_state(new_state));
}
atomic_dec_mb(&lu_gp->lu_gp_ref_cnt);
return rc;
}
static int core_alua_update_tpg_secondary_metadata(struct se_lun *lun)
{
struct se_portal_group *se_tpg = lun->lun_tpg;
unsigned char *md_buf;
char *path;
int len, rc;
mutex_lock(&lun->lun_tg_pt_md_mutex);
md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
if (!md_buf) {
pr_err("Unable to allocate buf for ALUA metadata\n");
rc = -ENOMEM;
goto out_unlock;
}
len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n"
"alua_tg_pt_status=0x%02x\n",
atomic_read(&lun->lun_tg_pt_secondary_offline),
lun->lun_tg_pt_secondary_stat);
if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) {
path = kasprintf(GFP_KERNEL, "%s/alua/%s/%s+%hu/lun_%llu",
db_root, se_tpg->se_tpg_tfo->fabric_name,
se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg),
lun->unpacked_lun);
} else {
path = kasprintf(GFP_KERNEL, "%s/alua/%s/%s/lun_%llu",
db_root, se_tpg->se_tpg_tfo->fabric_name,
se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
lun->unpacked_lun);
}
if (!path) {
rc = -ENOMEM;
goto out_free;
}
rc = core_alua_write_tpg_metadata(path, md_buf, len);
kfree(path);
out_free:
kfree(md_buf);
out_unlock:
mutex_unlock(&lun->lun_tg_pt_md_mutex);
return rc;
}
static int core_alua_set_tg_pt_secondary_state(
struct se_lun *lun,
int explicit,
int offline)
{
struct t10_alua_tg_pt_gp *tg_pt_gp;
int trans_delay_msecs;
spin_lock(&lun->lun_tg_pt_gp_lock);
tg_pt_gp = lun->lun_tg_pt_gp;
if (!tg_pt_gp) {
spin_unlock(&lun->lun_tg_pt_gp_lock);
pr_err("Unable to complete secondary state"
" transition\n");
return -EINVAL;
}
trans_delay_msecs = tg_pt_gp->tg_pt_gp_trans_delay_msecs;
/*
* Set the secondary ALUA target port access state to OFFLINE
* or release the previously secondary state for struct se_lun
*/
if (offline)
atomic_set(&lun->lun_tg_pt_secondary_offline, 1);
else
atomic_set(&lun->lun_tg_pt_secondary_offline, 0);
lun->lun_tg_pt_secondary_stat = (explicit) ?
ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG :
ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA;
pr_debug("Successful %s ALUA transition TG PT Group: %s ID: %hu"
" to secondary access state: %s\n", (explicit) ? "explicit" :
"implicit", config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item),
tg_pt_gp->tg_pt_gp_id, (offline) ? "OFFLINE" : "ONLINE");
spin_unlock(&lun->lun_tg_pt_gp_lock);
/*
* Do the optional transition delay after we set the secondary
* ALUA access state.
*/
if (trans_delay_msecs != 0)
msleep_interruptible(trans_delay_msecs);
/*
* See if we need to update the ALUA fabric port metadata for
* secondary state and status
*/
if (lun->lun_tg_pt_secondary_write_md)
core_alua_update_tpg_secondary_metadata(lun);
return 0;
}
struct t10_alua_lba_map *
core_alua_allocate_lba_map(struct list_head *list,
u64 first_lba, u64 last_lba)
{
struct t10_alua_lba_map *lba_map;
lba_map = kmem_cache_zalloc(t10_alua_lba_map_cache, GFP_KERNEL);
if (!lba_map) {
pr_err("Unable to allocate struct t10_alua_lba_map\n");
return ERR_PTR(-ENOMEM);
}
INIT_LIST_HEAD(&lba_map->lba_map_mem_list);
lba_map->lba_map_first_lba = first_lba;
lba_map->lba_map_last_lba = last_lba;
list_add_tail(&lba_map->lba_map_list, list);
return lba_map;
}
int
core_alua_allocate_lba_map_mem(struct t10_alua_lba_map *lba_map,
int pg_id, int state)
{
struct t10_alua_lba_map_member *lba_map_mem;
list_for_each_entry(lba_map_mem, &lba_map->lba_map_mem_list,
lba_map_mem_list) {
if (lba_map_mem->lba_map_mem_alua_pg_id == pg_id) {
pr_err("Duplicate pg_id %d in lba_map\n", pg_id);
return -EINVAL;
}
}
lba_map_mem = kmem_cache_zalloc(t10_alua_lba_map_mem_cache, GFP_KERNEL);
if (!lba_map_mem) {
pr_err("Unable to allocate struct t10_alua_lba_map_mem\n");
return -ENOMEM;
}
lba_map_mem->lba_map_mem_alua_state = state;
lba_map_mem->lba_map_mem_alua_pg_id = pg_id;
list_add_tail(&lba_map_mem->lba_map_mem_list,
&lba_map->lba_map_mem_list);
return 0;
}
void
core_alua_free_lba_map(struct list_head *lba_list)
{
struct t10_alua_lba_map *lba_map, *lba_map_tmp;
struct t10_alua_lba_map_member *lba_map_mem, *lba_map_mem_tmp;
list_for_each_entry_safe(lba_map, lba_map_tmp, lba_list,
lba_map_list) {
list_for_each_entry_safe(lba_map_mem, lba_map_mem_tmp,
&lba_map->lba_map_mem_list,
lba_map_mem_list) {
list_del(&lba_map_mem->lba_map_mem_list);
kmem_cache_free(t10_alua_lba_map_mem_cache,
lba_map_mem);
}
list_del(&lba_map->lba_map_list);
kmem_cache_free(t10_alua_lba_map_cache, lba_map);
}
}
void
core_alua_set_lba_map(struct se_device *dev, struct list_head *lba_map_list,
int segment_size, int segment_mult)
{
struct list_head old_lba_map_list;
struct t10_alua_tg_pt_gp *tg_pt_gp;
int activate = 0, supported;
INIT_LIST_HEAD(&old_lba_map_list);
spin_lock(&dev->t10_alua.lba_map_lock);
dev->t10_alua.lba_map_segment_size = segment_size;
dev->t10_alua.lba_map_segment_multiplier = segment_mult;
list_splice_init(&dev->t10_alua.lba_map_list, &old_lba_map_list);
if (lba_map_list) {
list_splice_init(lba_map_list, &dev->t10_alua.lba_map_list);
activate = 1;
}
spin_unlock(&dev->t10_alua.lba_map_lock);
spin_lock(&dev->t10_alua.tg_pt_gps_lock);
list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
tg_pt_gp_list) {
if (!tg_pt_gp->tg_pt_gp_valid_id)
continue;
supported = tg_pt_gp->tg_pt_gp_alua_supported_states;
if (activate)
supported |= ALUA_LBD_SUP;
else
supported &= ~ALUA_LBD_SUP;
tg_pt_gp->tg_pt_gp_alua_supported_states = supported;
}
spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
core_alua_free_lba_map(&old_lba_map_list);
}
struct t10_alua_lu_gp *
core_alua_allocate_lu_gp(const char *name, int def_group)
{
struct t10_alua_lu_gp *lu_gp;
lu_gp = kmem_cache_zalloc(t10_alua_lu_gp_cache, GFP_KERNEL);
if (!lu_gp) {
pr_err("Unable to allocate struct t10_alua_lu_gp\n");
return ERR_PTR(-ENOMEM);
}
INIT_LIST_HEAD(&lu_gp->lu_gp_node);
INIT_LIST_HEAD(&lu_gp->lu_gp_mem_list);
spin_lock_init(&lu_gp->lu_gp_lock);
atomic_set(&lu_gp->lu_gp_ref_cnt, 0);
if (def_group) {
lu_gp->lu_gp_id = alua_lu_gps_counter++;
lu_gp->lu_gp_valid_id = 1;
alua_lu_gps_count++;
}
return lu_gp;
}
int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *lu_gp, u16 lu_gp_id)
{
struct t10_alua_lu_gp *lu_gp_tmp;
u16 lu_gp_id_tmp;
/*
* The lu_gp->lu_gp_id may only be set once..
*/
if (lu_gp->lu_gp_valid_id) {
pr_warn("ALUA LU Group already has a valid ID,"
" ignoring request\n");
return -EINVAL;
}
spin_lock(&lu_gps_lock);
if (alua_lu_gps_count == 0x0000ffff) {
pr_err("Maximum ALUA alua_lu_gps_count:"
" 0x0000ffff reached\n");
spin_unlock(&lu_gps_lock);
kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
return -ENOSPC;
}
again:
lu_gp_id_tmp = (lu_gp_id != 0) ? lu_gp_id :
alua_lu_gps_counter++;
list_for_each_entry(lu_gp_tmp, &lu_gps_list, lu_gp_node) {
if (lu_gp_tmp->lu_gp_id == lu_gp_id_tmp) {
if (!lu_gp_id)
goto again;
pr_warn("ALUA Logical Unit Group ID: %hu"
" already exists, ignoring request\n",
lu_gp_id);
spin_unlock(&lu_gps_lock);
return -EINVAL;
}
}
lu_gp->lu_gp_id = lu_gp_id_tmp;
lu_gp->lu_gp_valid_id = 1;
list_add_tail(&lu_gp->lu_gp_node, &lu_gps_list);
alua_lu_gps_count++;
spin_unlock(&lu_gps_lock);
return 0;
}
static struct t10_alua_lu_gp_member *
core_alua_allocate_lu_gp_mem(struct se_device *dev)
{
struct t10_alua_lu_gp_member *lu_gp_mem;
lu_gp_mem = kmem_cache_zalloc(t10_alua_lu_gp_mem_cache, GFP_KERNEL);
if (!lu_gp_mem) {
pr_err("Unable to allocate struct t10_alua_lu_gp_member\n");
return ERR_PTR(-ENOMEM);
}
INIT_LIST_HEAD(&lu_gp_mem->lu_gp_mem_list);
spin_lock_init(&lu_gp_mem->lu_gp_mem_lock);
atomic_set(&lu_gp_mem->lu_gp_mem_ref_cnt, 0);
lu_gp_mem->lu_gp_mem_dev = dev;
dev->dev_alua_lu_gp_mem = lu_gp_mem;
return lu_gp_mem;
}
void core_alua_free_lu_gp(struct t10_alua_lu_gp *lu_gp)
{
struct t10_alua_lu_gp_member *lu_gp_mem, *lu_gp_mem_tmp;
/*
* Once we have reached this point, config_item_put() has
* already been called from target_core_alua_drop_lu_gp().
*
* Here, we remove the *lu_gp from the global list so that
* no associations can be made while we are releasing
* struct t10_alua_lu_gp.
*/
spin_lock(&lu_gps_lock);
list_del(&lu_gp->lu_gp_node);
alua_lu_gps_count--;
spin_unlock(&lu_gps_lock);
/*
* Allow struct t10_alua_lu_gp * referenced by core_alua_get_lu_gp_by_name()
* in target_core_configfs.c:target_core_store_alua_lu_gp() to be
* released with core_alua_put_lu_gp_from_name()
*/
while (atomic_read(&lu_gp->lu_gp_ref_cnt))
cpu_relax();
/*
* Release reference to struct t10_alua_lu_gp * from all associated
* struct se_device.
*/
spin_lock(&lu_gp->lu_gp_lock);
list_for_each_entry_safe(lu_gp_mem, lu_gp_mem_tmp,
&lu_gp->lu_gp_mem_list, lu_gp_mem_list) {
if (lu_gp_mem->lu_gp_assoc) {
list_del(&lu_gp_mem->lu_gp_mem_list);
lu_gp->lu_gp_members--;
lu_gp_mem->lu_gp_assoc = 0;
}
spin_unlock(&lu_gp->lu_gp_lock);
/*
*
* lu_gp_mem is associated with a single
* struct se_device->dev_alua_lu_gp_mem, and is released when
* struct se_device is released via core_alua_free_lu_gp_mem().
*
* If the passed lu_gp does NOT match the default_lu_gp, assume
* we want to re-associate a given lu_gp_mem with default_lu_gp.
*/
spin_lock(&lu_gp_mem->lu_gp_mem_lock);
if (lu_gp != default_lu_gp)
__core_alua_attach_lu_gp_mem(lu_gp_mem,
default_lu_gp);
else
lu_gp_mem->lu_gp = NULL;
spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
spin_lock(&lu_gp->lu_gp_lock);
}
spin_unlock(&lu_gp->lu_gp_lock);
kmem_cache_free(t10_alua_lu_gp_cache, lu_gp);
}
void core_alua_free_lu_gp_mem(struct se_device *dev)
{
struct t10_alua_lu_gp *lu_gp;
struct t10_alua_lu_gp_member *lu_gp_mem;
lu_gp_mem = dev->dev_alua_lu_gp_mem;
if (!lu_gp_mem)
return;
while (atomic_read(&lu_gp_mem->lu_gp_mem_ref_cnt))
cpu_relax();
spin_lock(&lu_gp_mem->lu_gp_mem_lock);
lu_gp = lu_gp_mem->lu_gp;
if (lu_gp) {
spin_lock(&lu_gp->lu_gp_lock);
if (lu_gp_mem->lu_gp_assoc) {
list_del(&lu_gp_mem->lu_gp_mem_list);
lu_gp->lu_gp_members--;
lu_gp_mem->lu_gp_assoc = 0;
}
spin_unlock(&lu_gp->lu_gp_lock);
lu_gp_mem->lu_gp = NULL;
}
spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
kmem_cache_free(t10_alua_lu_gp_mem_cache, lu_gp_mem);
}
struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *name)
{
struct t10_alua_lu_gp *lu_gp;
struct config_item *ci;
spin_lock(&lu_gps_lock);
list_for_each_entry(lu_gp, &lu_gps_list, lu_gp_node) {
if (!lu_gp->lu_gp_valid_id)
continue;
ci = &lu_gp->lu_gp_group.cg_item;
if (!strcmp(config_item_name(ci), name)) {
atomic_inc(&lu_gp->lu_gp_ref_cnt);
spin_unlock(&lu_gps_lock);
return lu_gp;
}
}
spin_unlock(&lu_gps_lock);
return NULL;
}
void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *lu_gp)
{
spin_lock(&lu_gps_lock);
atomic_dec(&lu_gp->lu_gp_ref_cnt);
spin_unlock(&lu_gps_lock);
}
/*
* Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
*/
void __core_alua_attach_lu_gp_mem(
struct t10_alua_lu_gp_member *lu_gp_mem,
struct t10_alua_lu_gp *lu_gp)
{
spin_lock(&lu_gp->lu_gp_lock);
lu_gp_mem->lu_gp = lu_gp;
lu_gp_mem->lu_gp_assoc = 1;
list_add_tail(&lu_gp_mem->lu_gp_mem_list, &lu_gp->lu_gp_mem_list);
lu_gp->lu_gp_members++;
spin_unlock(&lu_gp->lu_gp_lock);
}
/*
* Called with struct t10_alua_lu_gp_member->lu_gp_mem_lock
*/
void __core_alua_drop_lu_gp_mem(
struct t10_alua_lu_gp_member *lu_gp_mem,
struct t10_alua_lu_gp *lu_gp)
{
spin_lock(&lu_gp->lu_gp_lock);
list_del(&lu_gp_mem->lu_gp_mem_list);
lu_gp_mem->lu_gp = NULL;
lu_gp_mem->lu_gp_assoc = 0;
lu_gp->lu_gp_members--;
spin_unlock(&lu_gp->lu_gp_lock);
}
struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(struct se_device *dev,
const char *name, int def_group)
{
struct t10_alua_tg_pt_gp *tg_pt_gp;
tg_pt_gp = kmem_cache_zalloc(t10_alua_tg_pt_gp_cache, GFP_KERNEL);
if (!tg_pt_gp) {
pr_err("Unable to allocate struct t10_alua_tg_pt_gp\n");
return NULL;
}
INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_list);
INIT_LIST_HEAD(&tg_pt_gp->tg_pt_gp_lun_list);
mutex_init(&tg_pt_gp->tg_pt_gp_transition_mutex);
spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
tg_pt_gp->tg_pt_gp_dev = dev;
tg_pt_gp->tg_pt_gp_alua_access_state =
ALUA_ACCESS_STATE_ACTIVE_OPTIMIZED;
/*
* Enable both explicit and implicit ALUA support by default
*/
tg_pt_gp->tg_pt_gp_alua_access_type =
TPGS_EXPLICIT_ALUA | TPGS_IMPLICIT_ALUA;
/*
* Set the default Active/NonOptimized Delay in milliseconds
*/
tg_pt_gp->tg_pt_gp_nonop_delay_msecs = ALUA_DEFAULT_NONOP_DELAY_MSECS;
tg_pt_gp->tg_pt_gp_trans_delay_msecs = ALUA_DEFAULT_TRANS_DELAY_MSECS;
tg_pt_gp->tg_pt_gp_implicit_trans_secs = ALUA_DEFAULT_IMPLICIT_TRANS_SECS;
/*
* Enable all supported states
*/
tg_pt_gp->tg_pt_gp_alua_supported_states =
ALUA_T_SUP | ALUA_O_SUP |
ALUA_U_SUP | ALUA_S_SUP | ALUA_AN_SUP | ALUA_AO_SUP;
if (def_group) {
spin_lock(&dev->t10_alua.tg_pt_gps_lock);
tg_pt_gp->tg_pt_gp_id =
dev->t10_alua.alua_tg_pt_gps_counter++;
tg_pt_gp->tg_pt_gp_valid_id = 1;
dev->t10_alua.alua_tg_pt_gps_count++;
list_add_tail(&tg_pt_gp->tg_pt_gp_list,
&dev->t10_alua.tg_pt_gps_list);
spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
}
return tg_pt_gp;
}
int core_alua_set_tg_pt_gp_id(
struct t10_alua_tg_pt_gp *tg_pt_gp,
u16 tg_pt_gp_id)
{
struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
struct t10_alua_tg_pt_gp *tg_pt_gp_tmp;
u16 tg_pt_gp_id_tmp;
/*
* The tg_pt_gp->tg_pt_gp_id may only be set once..
*/
if (tg_pt_gp->tg_pt_gp_valid_id) {
pr_warn("ALUA TG PT Group already has a valid ID,"
" ignoring request\n");
return -EINVAL;
}
spin_lock(&dev->t10_alua.tg_pt_gps_lock);
if (dev->t10_alua.alua_tg_pt_gps_count == 0x0000ffff) {
pr_err("Maximum ALUA alua_tg_pt_gps_count:"
" 0x0000ffff reached\n");
spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
return -ENOSPC;
}
again:
tg_pt_gp_id_tmp = (tg_pt_gp_id != 0) ? tg_pt_gp_id :
dev->t10_alua.alua_tg_pt_gps_counter++;
list_for_each_entry(tg_pt_gp_tmp, &dev->t10_alua.tg_pt_gps_list,
tg_pt_gp_list) {
if (tg_pt_gp_tmp->tg_pt_gp_id == tg_pt_gp_id_tmp) {
if (!tg_pt_gp_id)
goto again;
pr_err("ALUA Target Port Group ID: %hu already"
" exists, ignoring request\n", tg_pt_gp_id);
spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
return -EINVAL;
}
}
tg_pt_gp->tg_pt_gp_id = tg_pt_gp_id_tmp;
tg_pt_gp->tg_pt_gp_valid_id = 1;
list_add_tail(&tg_pt_gp->tg_pt_gp_list,
&dev->t10_alua.tg_pt_gps_list);
dev->t10_alua.alua_tg_pt_gps_count++;
spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
return 0;
}
void core_alua_free_tg_pt_gp(
struct t10_alua_tg_pt_gp *tg_pt_gp)
{
struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
struct se_lun *lun, *next;
/*
* Once we have reached this point, config_item_put() has already
* been called from target_core_alua_drop_tg_pt_gp().
*
* Here we remove *tg_pt_gp from the global list so that
* no associations *OR* explicit ALUA via SET_TARGET_PORT_GROUPS
* can be made while we are releasing struct t10_alua_tg_pt_gp.
*/
spin_lock(&dev->t10_alua.tg_pt_gps_lock);
list_del(&tg_pt_gp->tg_pt_gp_list);
dev->t10_alua.alua_tg_pt_gps_counter--;
spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
/*
* Allow a struct t10_alua_tg_pt_gp_member * referenced by
* core_alua_get_tg_pt_gp_by_name() in
* target_core_configfs.c:target_core_store_alua_tg_pt_gp()
* to be released with core_alua_put_tg_pt_gp_from_name().
*/
while (atomic_read(&tg_pt_gp->tg_pt_gp_ref_cnt))
cpu_relax();
/*
* Release reference to struct t10_alua_tg_pt_gp from all associated
* struct se_port.
*/
spin_lock(&tg_pt_gp->tg_pt_gp_lock);
list_for_each_entry_safe(lun, next,
&tg_pt_gp->tg_pt_gp_lun_list, lun_tg_pt_gp_link) {
list_del_init(&lun->lun_tg_pt_gp_link);
tg_pt_gp->tg_pt_gp_members--;
spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
/*
* If the passed tg_pt_gp does NOT match the default_tg_pt_gp,
* assume we want to re-associate a given tg_pt_gp_mem with
* default_tg_pt_gp.
*/
spin_lock(&lun->lun_tg_pt_gp_lock);
if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
__target_attach_tg_pt_gp(lun,
dev->t10_alua.default_tg_pt_gp);
} else
lun->lun_tg_pt_gp = NULL;
spin_unlock(&lun->lun_tg_pt_gp_lock);
spin_lock(&tg_pt_gp->tg_pt_gp_lock);
}
spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
kmem_cache_free(t10_alua_tg_pt_gp_cache, tg_pt_gp);
}
static struct t10_alua_tg_pt_gp *core_alua_get_tg_pt_gp_by_name(
struct se_device *dev, const char *name)
{
struct t10_alua_tg_pt_gp *tg_pt_gp;
struct config_item *ci;
spin_lock(&dev->t10_alua.tg_pt_gps_lock);
list_for_each_entry(tg_pt_gp, &dev->t10_alua.tg_pt_gps_list,
tg_pt_gp_list) {
if (!tg_pt_gp->tg_pt_gp_valid_id)
continue;
ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
if (!strcmp(config_item_name(ci), name)) {
atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
return tg_pt_gp;
}
}
spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
return NULL;
}
static void core_alua_put_tg_pt_gp_from_name(
struct t10_alua_tg_pt_gp *tg_pt_gp)
{
struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
spin_lock(&dev->t10_alua.tg_pt_gps_lock);
atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
}
static void __target_attach_tg_pt_gp(struct se_lun *lun,
struct t10_alua_tg_pt_gp *tg_pt_gp)
{
struct se_dev_entry *se_deve;
assert_spin_locked(&lun->lun_tg_pt_gp_lock);
spin_lock(&tg_pt_gp->tg_pt_gp_lock);
lun->lun_tg_pt_gp = tg_pt_gp;
list_add_tail(&lun->lun_tg_pt_gp_link, &tg_pt_gp->tg_pt_gp_lun_list);
tg_pt_gp->tg_pt_gp_members++;
spin_lock(&lun->lun_deve_lock);
list_for_each_entry(se_deve, &lun->lun_deve_list, lun_link)
core_scsi3_ua_allocate(se_deve, 0x3f,
ASCQ_3FH_INQUIRY_DATA_HAS_CHANGED);
spin_unlock(&lun->lun_deve_lock);
spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
}
void target_attach_tg_pt_gp(struct se_lun *lun,
struct t10_alua_tg_pt_gp *tg_pt_gp)
{
spin_lock(&lun->lun_tg_pt_gp_lock);
__target_attach_tg_pt_gp(lun, tg_pt_gp);
spin_unlock(&lun->lun_tg_pt_gp_lock);
}
static void __target_detach_tg_pt_gp(struct se_lun *lun,
struct t10_alua_tg_pt_gp *tg_pt_gp)
{
assert_spin_locked(&lun->lun_tg_pt_gp_lock);
spin_lock(&tg_pt_gp->tg_pt_gp_lock);
list_del_init(&lun->lun_tg_pt_gp_link);
tg_pt_gp->tg_pt_gp_members--;
spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
lun->lun_tg_pt_gp = NULL;
}
void target_detach_tg_pt_gp(struct se_lun *lun)
{
struct t10_alua_tg_pt_gp *tg_pt_gp;
spin_lock(&lun->lun_tg_pt_gp_lock);
tg_pt_gp = lun->lun_tg_pt_gp;
if (tg_pt_gp)
__target_detach_tg_pt_gp(lun, tg_pt_gp);
spin_unlock(&lun->lun_tg_pt_gp_lock);
}
ssize_t core_alua_show_tg_pt_gp_info(struct se_lun *lun, char *page)
{
struct config_item *tg_pt_ci;
struct t10_alua_tg_pt_gp *tg_pt_gp;
ssize_t len = 0;
spin_lock(&lun->lun_tg_pt_gp_lock);
tg_pt_gp = lun->lun_tg_pt_gp;
if (tg_pt_gp) {
tg_pt_ci = &tg_pt_gp->tg_pt_gp_group.cg_item;
len += sprintf(page, "TG Port Alias: %s\nTG Port Group ID:"
" %hu\nTG Port Primary Access State: %s\nTG Port "
"Primary Access Status: %s\nTG Port Secondary Access"
" State: %s\nTG Port Secondary Access Status: %s\n",
config_item_name(tg_pt_ci), tg_pt_gp->tg_pt_gp_id,
core_alua_dump_state(
tg_pt_gp->tg_pt_gp_alua_access_state),
core_alua_dump_status(
tg_pt_gp->tg_pt_gp_alua_access_status),
atomic_read(&lun->lun_tg_pt_secondary_offline) ?
"Offline" : "None",
core_alua_dump_status(lun->lun_tg_pt_secondary_stat));
}
spin_unlock(&lun->lun_tg_pt_gp_lock);
return len;
}
ssize_t core_alua_store_tg_pt_gp_info(
struct se_lun *lun,
const char *page,
size_t count)
{
struct se_portal_group *tpg = lun->lun_tpg;
/*
* rcu_dereference_raw protected by se_lun->lun_group symlink
* reference to se_device->dev_group.
*/
struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
unsigned char buf[TG_PT_GROUP_NAME_BUF];
int move = 0;
if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA ||
(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
return -ENODEV;
if (count > TG_PT_GROUP_NAME_BUF) {
pr_err("ALUA Target Port Group alias too large!\n");
return -EINVAL;
}
memset(buf, 0, TG_PT_GROUP_NAME_BUF);
memcpy(buf, page, count);
/*
* Any ALUA target port group alias besides "NULL" means we will be
* making a new group association.
*/
if (strcmp(strstrip(buf), "NULL")) {
/*
* core_alua_get_tg_pt_gp_by_name() will increment reference to
* struct t10_alua_tg_pt_gp. This reference is released with
* core_alua_put_tg_pt_gp_from_name() below.
*/
tg_pt_gp_new = core_alua_get_tg_pt_gp_by_name(dev,
strstrip(buf));
if (!tg_pt_gp_new)
return -ENODEV;
}
spin_lock(&lun->lun_tg_pt_gp_lock);
tg_pt_gp = lun->lun_tg_pt_gp;
if (tg_pt_gp) {
/*
* Clearing an existing tg_pt_gp association, and replacing
* with the default_tg_pt_gp.
*/
if (!tg_pt_gp_new) {
pr_debug("Target_Core_ConfigFS: Moving"
" %s/tpgt_%hu/%s from ALUA Target Port Group:"
" alua/%s, ID: %hu back to"
" default_tg_pt_gp\n",
tpg->se_tpg_tfo->tpg_get_wwn(tpg),
tpg->se_tpg_tfo->tpg_get_tag(tpg),
config_item_name(&lun->lun_group.cg_item),
config_item_name(
&tg_pt_gp->tg_pt_gp_group.cg_item),
tg_pt_gp->tg_pt_gp_id);
__target_detach_tg_pt_gp(lun, tg_pt_gp);
__target_attach_tg_pt_gp(lun,
dev->t10_alua.default_tg_pt_gp);
spin_unlock(&lun->lun_tg_pt_gp_lock);
return count;
}
__target_detach_tg_pt_gp(lun, tg_pt_gp);
move = 1;
}
__target_attach_tg_pt_gp(lun, tg_pt_gp_new);
spin_unlock(&lun->lun_tg_pt_gp_lock);
pr_debug("Target_Core_ConfigFS: %s %s/tpgt_%hu/%s to ALUA"
" Target Port Group: alua/%s, ID: %hu\n", (move) ?
"Moving" : "Adding", tpg->se_tpg_tfo->tpg_get_wwn(tpg),
tpg->se_tpg_tfo->tpg_get_tag(tpg),
config_item_name(&lun->lun_group.cg_item),
config_item_name(&tg_pt_gp_new->tg_pt_gp_group.cg_item),
tg_pt_gp_new->tg_pt_gp_id);
core_alua_put_tg_pt_gp_from_name(tg_pt_gp_new);
return count;
}
ssize_t core_alua_show_access_type(
struct t10_alua_tg_pt_gp *tg_pt_gp,
char *page)
{
if ((tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA) &&
(tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA))
return sprintf(page, "Implicit and Explicit\n");
else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_IMPLICIT_ALUA)
return sprintf(page, "Implicit\n");
else if (tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)
return sprintf(page, "Explicit\n");
else
return sprintf(page, "None\n");
}
ssize_t core_alua_store_access_type(
struct t10_alua_tg_pt_gp *tg_pt_gp,
const char *page,
size_t count)
{
unsigned long tmp;
int ret;
ret = kstrtoul(page, 0, &tmp);
if (ret < 0) {
pr_err("Unable to extract alua_access_type\n");
return ret;
}
if ((tmp != 0) && (tmp != 1) && (tmp != 2) && (tmp != 3)) {
pr_err("Illegal value for alua_access_type:"
" %lu\n", tmp);
return -EINVAL;
}
if (tmp == 3)
tg_pt_gp->tg_pt_gp_alua_access_type =
TPGS_IMPLICIT_ALUA | TPGS_EXPLICIT_ALUA;
else if (tmp == 2)
tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_EXPLICIT_ALUA;
else if (tmp == 1)
tg_pt_gp->tg_pt_gp_alua_access_type = TPGS_IMPLICIT_ALUA;
else
tg_pt_gp->tg_pt_gp_alua_access_type = 0;
return count;
}
ssize_t core_alua_show_nonop_delay_msecs(
struct t10_alua_tg_pt_gp *tg_pt_gp,
char *page)
{
return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_nonop_delay_msecs);
}
ssize_t core_alua_store_nonop_delay_msecs(
struct t10_alua_tg_pt_gp *tg_pt_gp,
const char *page,
size_t count)
{
unsigned long tmp;
int ret;
ret = kstrtoul(page, 0, &tmp);
if (ret < 0) {
pr_err("Unable to extract nonop_delay_msecs\n");
return ret;
}
if (tmp > ALUA_MAX_NONOP_DELAY_MSECS) {
pr_err("Passed nonop_delay_msecs: %lu, exceeds"
" ALUA_MAX_NONOP_DELAY_MSECS: %d\n", tmp,
ALUA_MAX_NONOP_DELAY_MSECS);
return -EINVAL;
}
tg_pt_gp->tg_pt_gp_nonop_delay_msecs = (int)tmp;
return count;
}
ssize_t core_alua_show_trans_delay_msecs(
struct t10_alua_tg_pt_gp *tg_pt_gp,
char *page)
{
return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_trans_delay_msecs);
}
ssize_t core_alua_store_trans_delay_msecs(
struct t10_alua_tg_pt_gp *tg_pt_gp,
const char *page,
size_t count)
{
unsigned long tmp;
int ret;
ret = kstrtoul(page, 0, &tmp);
if (ret < 0) {
pr_err("Unable to extract trans_delay_msecs\n");
return ret;
}
if (tmp > ALUA_MAX_TRANS_DELAY_MSECS) {
pr_err("Passed trans_delay_msecs: %lu, exceeds"
" ALUA_MAX_TRANS_DELAY_MSECS: %d\n", tmp,
ALUA_MAX_TRANS_DELAY_MSECS);
return -EINVAL;
}
tg_pt_gp->tg_pt_gp_trans_delay_msecs = (int)tmp;
return count;
}
ssize_t core_alua_show_implicit_trans_secs(
struct t10_alua_tg_pt_gp *tg_pt_gp,
char *page)
{
return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_implicit_trans_secs);
}
ssize_t core_alua_store_implicit_trans_secs(
struct t10_alua_tg_pt_gp *tg_pt_gp,
const char *page,
size_t count)
{
unsigned long tmp;
int ret;
ret = kstrtoul(page, 0, &tmp);
if (ret < 0) {
pr_err("Unable to extract implicit_trans_secs\n");
return ret;
}
if (tmp > ALUA_MAX_IMPLICIT_TRANS_SECS) {
pr_err("Passed implicit_trans_secs: %lu, exceeds"
" ALUA_MAX_IMPLICIT_TRANS_SECS: %d\n", tmp,
ALUA_MAX_IMPLICIT_TRANS_SECS);
return -EINVAL;
}
tg_pt_gp->tg_pt_gp_implicit_trans_secs = (int)tmp;
return count;
}
ssize_t core_alua_show_preferred_bit(
struct t10_alua_tg_pt_gp *tg_pt_gp,
char *page)
{
return sprintf(page, "%d\n", tg_pt_gp->tg_pt_gp_pref);
}
ssize_t core_alua_store_preferred_bit(
struct t10_alua_tg_pt_gp *tg_pt_gp,
const char *page,
size_t count)
{
unsigned long tmp;
int ret;
ret = kstrtoul(page, 0, &tmp);
if (ret < 0) {
pr_err("Unable to extract preferred ALUA value\n");
return ret;
}
if ((tmp != 0) && (tmp != 1)) {
pr_err("Illegal value for preferred ALUA: %lu\n", tmp);
return -EINVAL;
}
tg_pt_gp->tg_pt_gp_pref = (int)tmp;
return count;
}
ssize_t core_alua_show_offline_bit(struct se_lun *lun, char *page)
{
return sprintf(page, "%d\n",
atomic_read(&lun->lun_tg_pt_secondary_offline));
}
ssize_t core_alua_store_offline_bit(
struct se_lun *lun,
const char *page,
size_t count)
{
/*
* rcu_dereference_raw protected by se_lun->lun_group symlink
* reference to se_device->dev_group.
*/
struct se_device *dev = rcu_dereference_raw(lun->lun_se_dev);
unsigned long tmp;
int ret;
if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_ALUA ||
(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE))
return -ENODEV;
ret = kstrtoul(page, 0, &tmp);
if (ret < 0) {
pr_err("Unable to extract alua_tg_pt_offline value\n");
return ret;
}
if ((tmp != 0) && (tmp != 1)) {
pr_err("Illegal value for alua_tg_pt_offline: %lu\n",
tmp);
return -EINVAL;
}
ret = core_alua_set_tg_pt_secondary_state(lun, 0, (int)tmp);
if (ret < 0)
return -EINVAL;
return count;
}
ssize_t core_alua_show_secondary_status(
struct se_lun *lun,
char *page)
{
return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_stat);
}
ssize_t core_alua_store_secondary_status(
struct se_lun *lun,
const char *page,
size_t count)
{
unsigned long tmp;
int ret;
ret = kstrtoul(page, 0, &tmp);
if (ret < 0) {
pr_err("Unable to extract alua_tg_pt_status\n");
return ret;
}
if ((tmp != ALUA_STATUS_NONE) &&
(tmp != ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
(tmp != ALUA_STATUS_ALTERED_BY_IMPLICIT_ALUA)) {
pr_err("Illegal value for alua_tg_pt_status: %lu\n",
tmp);
return -EINVAL;
}
lun->lun_tg_pt_secondary_stat = (int)tmp;
return count;
}
ssize_t core_alua_show_secondary_write_metadata(
struct se_lun *lun,
char *page)
{
return sprintf(page, "%d\n", lun->lun_tg_pt_secondary_write_md);
}
ssize_t core_alua_store_secondary_write_metadata(
struct se_lun *lun,
const char *page,
size_t count)
{
unsigned long tmp;
int ret;
ret = kstrtoul(page, 0, &tmp);
if (ret < 0) {
pr_err("Unable to extract alua_tg_pt_write_md\n");
return ret;
}
if ((tmp != 0) && (tmp != 1)) {
pr_err("Illegal value for alua_tg_pt_write_md:"
" %lu\n", tmp);
return -EINVAL;
}
lun->lun_tg_pt_secondary_write_md = (int)tmp;
return count;
}
int core_setup_alua(struct se_device *dev)
{
if (!(dev->transport->transport_flags &
TRANSPORT_FLAG_PASSTHROUGH_ALUA) &&
!(dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)) {
struct t10_alua_lu_gp_member *lu_gp_mem;
/*
* Associate this struct se_device with the default ALUA
* LUN Group.
*/
lu_gp_mem = core_alua_allocate_lu_gp_mem(dev);
if (IS_ERR(lu_gp_mem))
return PTR_ERR(lu_gp_mem);
spin_lock(&lu_gp_mem->lu_gp_mem_lock);
__core_alua_attach_lu_gp_mem(lu_gp_mem,
default_lu_gp);
spin_unlock(&lu_gp_mem->lu_gp_mem_lock);
pr_debug("%s: Adding to default ALUA LU Group:"
" core/alua/lu_gps/default_lu_gp\n",
dev->transport->name);
}
return 0;
}
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