OpenE2K/linux
6
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
db9355c296
linux/drivers/target/target_core_alua.c
Hannes Reinecke 38edd72457 target_core_alua: check for buffer overflow 
When a writing to a command-provided buffer we need to ensure
that we're not writing past the end of it.
At the same time we need to continue processing as typically
the final data length (ie the required size of the buffer)
need to be returned.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2014-01-09 21:48:38 -08:00

2415 lines
65 KiB
C
Raw Blame History

/*******************************************************************************
* 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/export.h>
#include <linux/file.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.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/target_core_configfs.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);
static int core_alua_set_tg_pt_secondary_state(
struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
struct se_port *port, int explicit, int offline);
static char *core_alua_dump_state(int state);
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 se_port *port;
struct t10_alua_tg_pt_gp *tg_pt_gp;
struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
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++] |= (atomic_read(
&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
*/
buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff);
buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff);
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(tg_pt_gp_mem, &tg_pt_gp->tg_pt_gp_mem_list,
tg_pt_gp_mem_list) {
port = tg_pt_gp_mem->tg_pt;
/*
* Start Target Port descriptor format
*
* See spc4r17 section 6.2.7 Table 247
*/
off += 2; /* Skip over Obsolete */
/*
* Set RELATIVE TARGET PORT IDENTIFIER
*/
buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
buf[off++] = (port->sep_rtpi & 0xff);
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.
*/
port = cmd->se_lun->lun_sep;
tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
if (tg_pt_gp_mem) {
spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
if (tg_pt_gp)
buf[5] = tg_pt_gp->tg_pt_gp_implicit_trans_secs;
spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
}
}
transport_kunmap_data_sg(cmd);
target_complete_cmd(cmd, GOOD);
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_port *port, *l_port = cmd->se_lun->lun_sep;
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;
struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *l_tg_pt_gp_mem;
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 (!l_port)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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.
*/
l_tg_pt_gp_mem = l_port->sep_alua_tg_pt_gp_mem;
if (!l_tg_pt_gp_mem) {
pr_err("Unable to access l_port->sep_alua_tg_pt_gp_mem\n");
rc = TCM_UNSUPPORTED_SCSI_OPCODE;
goto out;
}
spin_lock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
l_tg_pt_gp = l_tg_pt_gp_mem->tg_pt_gp;
if (!l_tg_pt_gp) {
spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
pr_err("Unable to access *l_tg_pt_gp_mem->tg_pt_gp\n");
rc = TCM_UNSUPPORTED_SCSI_OPCODE;
goto out;
}
spin_unlock(&l_tg_pt_gp_mem->tg_pt_gp_mem_lock);
if (!(l_tg_pt_gp->tg_pt_gp_alua_access_type & TPGS_EXPLICIT_ALUA)) {
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;
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);
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(&tg_pt_gp->tg_pt_gp_ref_cnt);
smp_mb__after_atomic_inc();
spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
if (!core_alua_do_port_transition(tg_pt_gp,
dev, l_port, nacl,
alua_access_state, 1))
found = true;
spin_lock(&dev->t10_alua.tg_pt_gps_lock);
atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
smp_mb__after_atomic_dec();
break;
}
spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
} else {
/*
* 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(port, &dev->dev_sep_list,
sep_list) {
if (port->sep_rtpi != rtpi)
continue;
tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
spin_unlock(&dev->se_port_lock);
if (!core_alua_set_tg_pt_secondary_state(
tg_pt_gp_mem, port, 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 int core_alua_state_nonoptimized(
struct se_cmd *cmd,
unsigned char *cdb,
int nonop_delay_msecs,
u8 *alua_ascq)
{
/*
* 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;
return 0;
}
static inline int core_alua_state_lba_dependent(
struct se_cmd *cmd,
struct t10_alua_tg_pt_gp *tg_pt_gp,
u8 *alua_ascq)
{
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 = sector_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);
*alua_ascq = 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);
*alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
return 1;
case ALUA_ACCESS_STATE_UNAVAILABLE:
spin_unlock(&dev->t10_alua.lba_map_lock);
*alua_ascq = 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,
u8 *alua_ascq)
{
/*
* 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:
return 0;
case MAINTENANCE_IN:
switch (cdb[1] & 0x1f) {
case MI_REPORT_TARGET_PGS:
return 0;
default:
*alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
return 1;
}
case MAINTENANCE_OUT:
switch (cdb[1]) {
case MO_SET_TARGET_PGS:
return 0;
default:
*alua_ascq = 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:
*alua_ascq = ASCQ_04H_ALUA_TG_PT_STANDBY;
return 1;
}
return 0;
}
static inline int core_alua_state_unavailable(
struct se_cmd *cmd,
unsigned char *cdb,
u8 *alua_ascq)
{
/*
* 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:
*alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
return 1;
}
case MAINTENANCE_OUT:
switch (cdb[1]) {
case MO_SET_TARGET_PGS:
return 0;
default:
*alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
return 1;
}
case REQUEST_SENSE:
case READ_BUFFER:
case WRITE_BUFFER:
return 0;
default:
*alua_ascq = ASCQ_04H_ALUA_TG_PT_UNAVAILABLE;
return 1;
}
return 0;
}
static inline int core_alua_state_transition(
struct se_cmd *cmd,
unsigned char *cdb,
u8 *alua_ascq)
{
/*
* 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:
*alua_ascq = ASCQ_04H_ALUA_STATE_TRANSITION;
return 1;
}
case REQUEST_SENSE:
case READ_BUFFER:
case WRITE_BUFFER:
return 0;
default:
*alua_ascq = 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 se_port *port = lun->lun_sep;
struct t10_alua_tg_pt_gp *tg_pt_gp;
struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
int out_alua_state, nonop_delay_msecs;
u8 alua_ascq;
int ret;
if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
return 0;
if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)
return 0;
if (!port)
return 0;
/*
* First, check for a struct se_port specific secondary ALUA target port
* access state: OFFLINE
*/
if (atomic_read(&port->sep_tg_pt_secondary_offline)) {
pr_debug("ALUA: Got secondary offline status for local"
" target port\n");
alua_ascq = ASCQ_04H_ALUA_OFFLINE;
ret = 1;
goto out;
}
/*
* Second, obtain the struct t10_alua_tg_pt_gp_member pointer to the
* ALUA target port group, to obtain current ALUA access state.
* Otherwise look for the underlying struct se_device association with
* a ALUA logical unit group.
*/
tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
if (!tg_pt_gp_mem)
return 0;
spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
nonop_delay_msecs = tg_pt_gp->tg_pt_gp_nonop_delay_msecs;
spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_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:
ret = core_alua_state_nonoptimized(cmd, cdb,
nonop_delay_msecs, &alua_ascq);
break;
case ALUA_ACCESS_STATE_STANDBY:
ret = core_alua_state_standby(cmd, cdb, &alua_ascq);
break;
case ALUA_ACCESS_STATE_UNAVAILABLE:
ret = core_alua_state_unavailable(cmd, cdb, &alua_ascq);
break;
case ALUA_ACCESS_STATE_TRANSITION:
ret = core_alua_state_transition(cmd, cdb, &alua_ascq);
break;
case ALUA_ACCESS_STATE_LBA_DEPENDENT:
ret = core_alua_state_lba_dependent(cmd, tg_pt_gp, &alua_ascq);
break;
/*
* OFFLINE is a secondary ALUA target port group access state, that is
* handled above with struct se_port->sep_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;
}
out:
if (ret > 0) {
/*
* 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->get_fabric_name(), alua_ascq);
cmd->scsi_asc = 0x04;
cmd->scsi_ascq = alua_ascq;
return TCM_CHECK_CONDITION_NOT_READY;
}
return 0;
}
/*
* Check implicit and explicit ALUA state change request.
*/
static sense_reason_t
core_alua_check_transition(int state, int valid, int *primary)
{
/*
* 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:
/*
* Transitioning is set internally, and
* cannot be selected manually.
*/
goto not_supported;
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);
/*
* Called with tg_pt_gp->tg_pt_gp_md_mutex or tg_pt_gp_mem->sep_tg_pt_md_mutex
*
*/
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);
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, 0);
if (ret < 0)
pr_err("Error writing ALUA metadata file: %s\n", path);
fput(file);
return (ret < 0) ? -EIO : 0;
}
/*
* Called with tg_pt_gp->tg_pt_gp_md_mutex held
*/
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[ALUA_METADATA_PATH_LEN];
int len, rc;
md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
if (!md_buf) {
pr_err("Unable to allocate buf for ALUA metadata\n");
return -ENOMEM;
}
memset(path, 0, ALUA_METADATA_PATH_LEN);
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_pending_state,
tg_pt_gp->tg_pt_gp_alua_access_status);
snprintf(path, ALUA_METADATA_PATH_LEN,
"/var/target/alua/tpgs_%s/%s", &wwn->unit_serial[0],
config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
rc = core_alua_write_tpg_metadata(path, md_buf, len);
kfree(md_buf);
return rc;
}
static void core_alua_do_transition_tg_pt_work(struct work_struct *work)
{
struct t10_alua_tg_pt_gp *tg_pt_gp = container_of(work,
struct t10_alua_tg_pt_gp, tg_pt_gp_transition_work.work);
struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
struct se_dev_entry *se_deve;
struct se_lun_acl *lacl;
struct se_port *port;
struct t10_alua_tg_pt_gp_member *mem;
bool explicit = (tg_pt_gp->tg_pt_gp_alua_access_status ==
ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG);
spin_lock(&tg_pt_gp->tg_pt_gp_lock);
list_for_each_entry(mem, &tg_pt_gp->tg_pt_gp_mem_list,
tg_pt_gp_mem_list) {
port = mem->tg_pt;
/*
* 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
*/
atomic_inc(&mem->tg_pt_gp_mem_ref_cnt);
smp_mb__after_atomic_inc();
spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
spin_lock_bh(&port->sep_alua_lock);
list_for_each_entry(se_deve, &port->sep_alua_list,
alua_port_list) {
lacl = se_deve->se_lun_acl;
/*
* se_deve->se_lun_acl pointer may be NULL for a
* entry created without explicit Node+MappedLUN ACLs
*/
if (!lacl)
continue;
if ((tg_pt_gp->tg_pt_gp_alua_access_status ==
ALUA_STATUS_ALTERED_BY_EXPLICIT_STPG) &&
(tg_pt_gp->tg_pt_gp_alua_nacl != NULL) &&
(tg_pt_gp->tg_pt_gp_alua_nacl == lacl->se_lun_nacl) &&
(tg_pt_gp->tg_pt_gp_alua_port != NULL) &&
(tg_pt_gp->tg_pt_gp_alua_port == port))
continue;
core_scsi3_ua_allocate(lacl->se_lun_nacl,
se_deve->mapped_lun, 0x2A,
ASCQ_2AH_ASYMMETRIC_ACCESS_STATE_CHANGED);
}
spin_unlock_bh(&port->sep_alua_lock);
spin_lock(&tg_pt_gp->tg_pt_gp_lock);
atomic_dec(&mem->tg_pt_gp_mem_ref_cnt);
smp_mb__after_atomic_dec();
}
spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
/*
* 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) {
mutex_lock(&tg_pt_gp->tg_pt_gp_md_mutex);
core_alua_update_tpg_primary_metadata(tg_pt_gp);
mutex_unlock(&tg_pt_gp->tg_pt_gp_md_mutex);
}
/*
* Set the current primary ALUA access state to the requested new state
*/
atomic_set(&tg_pt_gp->tg_pt_gp_alua_access_state,
tg_pt_gp->tg_pt_gp_alua_pending_state);
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(tg_pt_gp->tg_pt_gp_alua_previous_state),
core_alua_dump_state(tg_pt_gp->tg_pt_gp_alua_pending_state));
spin_lock(&dev->t10_alua.tg_pt_gps_lock);
atomic_dec(&tg_pt_gp->tg_pt_gp_ref_cnt);
smp_mb__after_atomic_dec();
spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
if (tg_pt_gp->tg_pt_gp_transition_complete)
complete(tg_pt_gp->tg_pt_gp_transition_complete);
}
static int core_alua_do_transition_tg_pt(
struct t10_alua_tg_pt_gp *tg_pt_gp,
int new_state,
int explicit)
{
struct se_device *dev = tg_pt_gp->tg_pt_gp_dev;
DECLARE_COMPLETION_ONSTACK(wait);
/* Nothing to be done here */
if (atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) == new_state)
return 0;
if (new_state == ALUA_ACCESS_STATE_TRANSITION)
return -EAGAIN;
/*
* Flush any pending transitions
*/
if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs &&
atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state) ==
ALUA_ACCESS_STATE_TRANSITION) {
/* Just in case */
tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
tg_pt_gp->tg_pt_gp_transition_complete = &wait;
flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);
wait_for_completion(&wait);
tg_pt_gp->tg_pt_gp_transition_complete = NULL;
return 0;
}
/*
* Save the old primary ALUA access state, and set the current state
* to ALUA_ACCESS_STATE_TRANSITION.
*/
tg_pt_gp->tg_pt_gp_alua_previous_state =
atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
tg_pt_gp->tg_pt_gp_alua_pending_state = new_state;
atomic_set(&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;
/*
* 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);
/*
* Take a reference for workqueue item
*/
spin_lock(&dev->t10_alua.tg_pt_gps_lock);
atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
smp_mb__after_atomic_inc();
spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
if (!explicit && tg_pt_gp->tg_pt_gp_implicit_trans_secs) {
unsigned long transition_tmo;
transition_tmo = tg_pt_gp->tg_pt_gp_implicit_trans_secs * HZ;
queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq,
&tg_pt_gp->tg_pt_gp_transition_work,
transition_tmo);
} else {
tg_pt_gp->tg_pt_gp_transition_complete = &wait;
queue_delayed_work(tg_pt_gp->tg_pt_gp_dev->tmr_wq,
&tg_pt_gp->tg_pt_gp_transition_work, 0);
wait_for_completion(&wait);
tg_pt_gp->tg_pt_gp_transition_complete = NULL;
}
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_port *l_port,
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;
valid_states = l_tg_pt_gp->tg_pt_gp_alua_supported_states;
if (core_alua_check_transition(new_state, valid_states, &primary) != 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);
smp_mb__after_atomic_inc();
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_port = l_port;
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(&lu_gp->lu_gp_ref_cnt);
smp_mb__after_atomic_dec();
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(&lu_gp_mem->lu_gp_mem_ref_cnt);
smp_mb__after_atomic_inc();
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_port = l_port;
tg_pt_gp->tg_pt_gp_alua_nacl = l_nacl;
} else {
tg_pt_gp->tg_pt_gp_alua_port = NULL;
tg_pt_gp->tg_pt_gp_alua_nacl = NULL;
}
atomic_inc(&tg_pt_gp->tg_pt_gp_ref_cnt);
smp_mb__after_atomic_inc();
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(&tg_pt_gp->tg_pt_gp_ref_cnt);
smp_mb__after_atomic_dec();
if (rc)
break;
}
spin_unlock(&dev->t10_alua.tg_pt_gps_lock);
spin_lock(&lu_gp->lu_gp_lock);
atomic_dec(&lu_gp_mem->lu_gp_mem_ref_cnt);
smp_mb__after_atomic_dec();
}
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(&lu_gp->lu_gp_ref_cnt);
smp_mb__after_atomic_dec();
return rc;
}
/*
* Called with tg_pt_gp_mem->sep_tg_pt_md_mutex held
*/
static int core_alua_update_tpg_secondary_metadata(
struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
struct se_port *port)
{
unsigned char *md_buf;
struct se_portal_group *se_tpg = port->sep_tpg;
char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN];
int len, rc;
md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
if (!md_buf) {
pr_err("Unable to allocate buf for ALUA metadata\n");
return -ENOMEM;
}
memset(path, 0, ALUA_METADATA_PATH_LEN);
memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN);
len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s",
se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg));
if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL)
snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu",
se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n"
"alua_tg_pt_status=0x%02x\n",
atomic_read(&port->sep_tg_pt_secondary_offline),
port->sep_tg_pt_secondary_stat);
snprintf(path, ALUA_METADATA_PATH_LEN, "/var/target/alua/%s/%s/lun_%u",
se_tpg->se_tpg_tfo->get_fabric_name(), wwn,
port->sep_lun->unpacked_lun);
rc = core_alua_write_tpg_metadata(path, md_buf, len);
kfree(md_buf);
return rc;
}
static int core_alua_set_tg_pt_secondary_state(
struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
struct se_port *port,
int explicit,
int offline)
{
struct t10_alua_tg_pt_gp *tg_pt_gp;
int trans_delay_msecs;
spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
if (!tg_pt_gp) {
spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_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_port
*/
if (offline)
atomic_set(&port->sep_tg_pt_secondary_offline, 1);
else
atomic_set(&port->sep_tg_pt_secondary_offline, 0);
port->sep_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(&tg_pt_gp_mem->tg_pt_gp_mem_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 (port->sep_tg_pt_secondary_write_md) {
mutex_lock(&port->sep_tg_pt_md_mutex);
core_alua_update_tpg_secondary_metadata(tg_pt_gp_mem, port);
mutex_unlock(&port->sep_tg_pt_md_mutex);
}
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_mem_list);
mutex_init(&tg_pt_gp->tg_pt_gp_md_mutex);
spin_lock_init(&tg_pt_gp->tg_pt_gp_lock);
atomic_set(&tg_pt_gp->tg_pt_gp_ref_cnt, 0);
INIT_DELAYED_WORK(&tg_pt_gp->tg_pt_gp_transition_work,
core_alua_do_transition_tg_pt_work);
tg_pt_gp->tg_pt_gp_dev = dev;
atomic_set(&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;
}
struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem(
struct se_port *port)
{
struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
tg_pt_gp_mem = kmem_cache_zalloc(t10_alua_tg_pt_gp_mem_cache,
GFP_KERNEL);
if (!tg_pt_gp_mem) {
pr_err("Unable to allocate struct t10_alua_tg_pt_gp_member\n");
return ERR_PTR(-ENOMEM);
}
INIT_LIST_HEAD(&tg_pt_gp_mem->tg_pt_gp_mem_list);
spin_lock_init(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
atomic_set(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt, 0);
tg_pt_gp_mem->tg_pt = port;
port->sep_alua_tg_pt_gp_mem = tg_pt_gp_mem;
return tg_pt_gp_mem;
}
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 t10_alua_tg_pt_gp_member *tg_pt_gp_mem, *tg_pt_gp_mem_tmp;
/*
* 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);
flush_delayed_work(&tg_pt_gp->tg_pt_gp_transition_work);
/*
* 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(tg_pt_gp_mem, tg_pt_gp_mem_tmp,
&tg_pt_gp->tg_pt_gp_mem_list, tg_pt_gp_mem_list) {
if (tg_pt_gp_mem->tg_pt_gp_assoc) {
list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
tg_pt_gp->tg_pt_gp_members--;
tg_pt_gp_mem->tg_pt_gp_assoc = 0;
}
spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
/*
* tg_pt_gp_mem is associated with a single
* se_port->sep_alua_tg_pt_gp_mem, and is released via
* core_alua_free_tg_pt_gp_mem().
*
* 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(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
if (tg_pt_gp != dev->t10_alua.default_tg_pt_gp) {
__core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
dev->t10_alua.default_tg_pt_gp);
} else
tg_pt_gp_mem->tg_pt_gp = NULL;
spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_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);
}
void core_alua_free_tg_pt_gp_mem(struct se_port *port)
{
struct t10_alua_tg_pt_gp *tg_pt_gp;
struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
if (!tg_pt_gp_mem)
return;
while (atomic_read(&tg_pt_gp_mem->tg_pt_gp_mem_ref_cnt))
cpu_relax();
spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
if (tg_pt_gp) {
spin_lock(&tg_pt_gp->tg_pt_gp_lock);
if (tg_pt_gp_mem->tg_pt_gp_assoc) {
list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
tg_pt_gp->tg_pt_gp_members--;
tg_pt_gp_mem->tg_pt_gp_assoc = 0;
}
spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
tg_pt_gp_mem->tg_pt_gp = NULL;
}
spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
kmem_cache_free(t10_alua_tg_pt_gp_mem_cache, tg_pt_gp_mem);
}
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);
}
/*
* Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
*/
void __core_alua_attach_tg_pt_gp_mem(
struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
struct t10_alua_tg_pt_gp *tg_pt_gp)
{
spin_lock(&tg_pt_gp->tg_pt_gp_lock);
tg_pt_gp_mem->tg_pt_gp = tg_pt_gp;
tg_pt_gp_mem->tg_pt_gp_assoc = 1;
list_add_tail(&tg_pt_gp_mem->tg_pt_gp_mem_list,
&tg_pt_gp->tg_pt_gp_mem_list);
tg_pt_gp->tg_pt_gp_members++;
spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
}
/*
* Called with struct t10_alua_tg_pt_gp_member->tg_pt_gp_mem_lock held
*/
static void __core_alua_drop_tg_pt_gp_mem(
struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem,
struct t10_alua_tg_pt_gp *tg_pt_gp)
{
spin_lock(&tg_pt_gp->tg_pt_gp_lock);
list_del(&tg_pt_gp_mem->tg_pt_gp_mem_list);
tg_pt_gp_mem->tg_pt_gp = NULL;
tg_pt_gp_mem->tg_pt_gp_assoc = 0;
tg_pt_gp->tg_pt_gp_members--;
spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
}
ssize_t core_alua_show_tg_pt_gp_info(struct se_port *port, char *page)
{
struct config_item *tg_pt_ci;
struct t10_alua_tg_pt_gp *tg_pt_gp;
struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
ssize_t len = 0;
tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
if (!tg_pt_gp_mem)
return len;
spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
tg_pt_gp = tg_pt_gp_mem->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(atomic_read(
&tg_pt_gp->tg_pt_gp_alua_access_state)),
core_alua_dump_status(
tg_pt_gp->tg_pt_gp_alua_access_status),
(atomic_read(&port->sep_tg_pt_secondary_offline)) ?
"Offline" : "None",
core_alua_dump_status(port->sep_tg_pt_secondary_stat));
}
spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
return len;
}
ssize_t core_alua_store_tg_pt_gp_info(
struct se_port *port,
const char *page,
size_t count)
{
struct se_portal_group *tpg;
struct se_lun *lun;
struct se_device *dev = port->sep_lun->lun_se_dev;
struct t10_alua_tg_pt_gp *tg_pt_gp = NULL, *tg_pt_gp_new = NULL;
struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
unsigned char buf[TG_PT_GROUP_NAME_BUF];
int move = 0;
tpg = port->sep_tpg;
lun = port->sep_lun;
tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
if (!tg_pt_gp_mem)
return 0;
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(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
tg_pt_gp = tg_pt_gp_mem->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);
__core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
__core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem,
dev->t10_alua.default_tg_pt_gp);
spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
return count;
}
/*
* Removing existing association of tg_pt_gp_mem with tg_pt_gp
*/
__core_alua_drop_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp);
move = 1;
}
/*
* Associate tg_pt_gp_mem with tg_pt_gp_new.
*/
__core_alua_attach_tg_pt_gp_mem(tg_pt_gp_mem, tg_pt_gp_new);
spin_unlock(&tg_pt_gp_mem->tg_pt_gp_mem_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)
{
if (!lun->lun_sep)
return -ENODEV;
return sprintf(page, "%d\n",
atomic_read(&lun->lun_sep->sep_tg_pt_secondary_offline));
}
ssize_t core_alua_store_offline_bit(
struct se_lun *lun,
const char *page,
size_t count)
{
struct t10_alua_tg_pt_gp_member *tg_pt_gp_mem;
unsigned long tmp;
int ret;
if (!lun->lun_sep)
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;
}
tg_pt_gp_mem = lun->lun_sep->sep_alua_tg_pt_gp_mem;
if (!tg_pt_gp_mem) {
pr_err("Unable to locate *tg_pt_gp_mem\n");
return -EINVAL;
}
ret = core_alua_set_tg_pt_secondary_state(tg_pt_gp_mem,
lun->lun_sep, 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_sep->sep_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_sep->sep_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_sep->sep_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_sep->sep_tg_pt_secondary_write_md = (int)tmp;
return count;
}
int core_setup_alua(struct se_device *dev)
{
if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV &&
!(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;
}
Reference in New Issue View Git Blame Copy Permalink