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target_core_pr.c
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target_core_pr.c
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/*******************************************************************************
* Filename: target_core_pr.c
*
* This file contains SPC-3 compliant persistent reservations and
* legacy SPC-2 reservations with compatible reservation handling (CRH=1)
*
* Copyright (c) 2009, 2010 Rising Tide Systems
* Copyright (c) 2009, 2010 Linux-iSCSI.org
*
* Nicholas A. Bellinger <[email protected]>
*
* 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/list.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_pr.h"
#include "target_core_ua.h"
/*
* Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)
*/
struct pr_transport_id_holder {
int dest_local_nexus;
struct t10_pr_registration *dest_pr_reg;
struct se_portal_group *dest_tpg;
struct se_node_acl *dest_node_acl;
struct se_dev_entry *dest_se_deve;
struct list_head dest_list;
};
int core_pr_dump_initiator_port(
struct t10_pr_registration *pr_reg,
char *buf,
u32 size)
{
if (!pr_reg->isid_present_at_reg)
return 0;
snprintf(buf, size, ",i,0x%s", &pr_reg->pr_reg_isid[0]);
return 1;
}
static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
struct t10_pr_registration *, int);
static int core_scsi2_reservation_seq_non_holder(
struct se_cmd *cmd,
unsigned char *cdb,
u32 pr_reg_type)
{
switch (cdb[0]) {
case INQUIRY:
case RELEASE:
case RELEASE_10:
return 0;
default:
return 1;
}
return 1;
}
static int core_scsi2_reservation_check(struct se_cmd *cmd, u32 *pr_reg_type)
{
struct se_device *dev = cmd->se_dev;
struct se_session *sess = cmd->se_sess;
int ret;
if (!sess)
return 0;
spin_lock(&dev->dev_reservation_lock);
if (!dev->dev_reserved_node_acl || !sess) {
spin_unlock(&dev->dev_reservation_lock);
return 0;
}
if (dev->dev_reserved_node_acl != sess->se_node_acl) {
spin_unlock(&dev->dev_reservation_lock);
return -EINVAL;
}
if (!(dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID)) {
spin_unlock(&dev->dev_reservation_lock);
return 0;
}
ret = (dev->dev_res_bin_isid == sess->sess_bin_isid) ? 0 : -EINVAL;
spin_unlock(&dev->dev_reservation_lock);
return ret;
}
static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
struct se_node_acl *, struct se_session *);
static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd)
{
struct se_session *se_sess = cmd->se_sess;
struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
struct t10_pr_registration *pr_reg;
struct t10_reservation *pr_tmpl = &su_dev->t10_pr;
int crh = (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS);
int conflict = 0;
if (!crh)
return -EINVAL;
pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
se_sess);
if (pr_reg) {
/*
* From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
* behavior
*
* A RESERVE(6) or RESERVE(10) command shall complete with GOOD
* status, but no reservation shall be established and the
* persistent reservation shall not be changed, if the command
* is received from a) and b) below.
*
* A RELEASE(6) or RELEASE(10) command shall complete with GOOD
* status, but the persistent reservation shall not be released,
* if the command is received from a) and b)
*
* a) An I_T nexus that is a persistent reservation holder; or
* b) An I_T nexus that is registered if a registrants only or
* all registrants type persistent reservation is present.
*
* In all other cases, a RESERVE(6) command, RESERVE(10) command,
* RELEASE(6) command, or RELEASE(10) command shall be processed
* as defined in SPC-2.
*/
if (pr_reg->pr_res_holder) {
core_scsi3_put_pr_reg(pr_reg);
return 1;
}
if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
(pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
(pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
(pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
core_scsi3_put_pr_reg(pr_reg);
return 1;
}
core_scsi3_put_pr_reg(pr_reg);
conflict = 1;
} else {
/*
* Following spc2r20 5.5.1 Reservations overview:
*
* If a logical unit has executed a PERSISTENT RESERVE OUT
* command with the REGISTER or the REGISTER AND IGNORE
* EXISTING KEY service action and is still registered by any
* initiator, all RESERVE commands and all RELEASE commands
* regardless of initiator shall conflict and shall terminate
* with a RESERVATION CONFLICT status.
*/
spin_lock(&pr_tmpl->registration_lock);
conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
spin_unlock(&pr_tmpl->registration_lock);
}
if (conflict) {
pr_err("Received legacy SPC-2 RESERVE/RELEASE"
" while active SPC-3 registrations exist,"
" returning RESERVATION_CONFLICT\n");
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EBUSY;
}
return 0;
}
int target_scsi2_reservation_release(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
struct se_session *sess = cmd->se_sess;
struct se_portal_group *tpg = sess->se_tpg;
int ret = 0, rc;
if (!sess || !tpg)
goto out;
rc = target_check_scsi2_reservation_conflict(cmd);
if (rc == 1)
goto out;
else if (rc < 0) {
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
ret = -EINVAL;
goto out;
}
ret = 0;
spin_lock(&dev->dev_reservation_lock);
if (!dev->dev_reserved_node_acl || !sess)
goto out_unlock;
if (dev->dev_reserved_node_acl != sess->se_node_acl)
goto out_unlock;
if (dev->dev_res_bin_isid != sess->sess_bin_isid)
goto out_unlock;
dev->dev_reserved_node_acl = NULL;
dev->dev_flags &= ~DF_SPC2_RESERVATIONS;
if (dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID) {
dev->dev_res_bin_isid = 0;
dev->dev_flags &= ~DF_SPC2_RESERVATIONS_WITH_ISID;
}
pr_debug("SCSI-2 Released reservation for %s LUN: %u ->"
" MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
sess->se_node_acl->initiatorname);
out_unlock:
spin_unlock(&dev->dev_reservation_lock);
out:
if (!ret)
target_complete_cmd(cmd, GOOD);
return ret;
}
int target_scsi2_reservation_reserve(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
struct se_session *sess = cmd->se_sess;
struct se_portal_group *tpg = sess->se_tpg;
int ret = 0, rc;
if ((cmd->t_task_cdb[1] & 0x01) &&
(cmd->t_task_cdb[1] & 0x02)) {
pr_err("LongIO and Obselete Bits set, returning"
" ILLEGAL_REQUEST\n");
cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
ret = -EINVAL;
goto out;
}
/*
* This is currently the case for target_core_mod passthrough struct se_cmd
* ops
*/
if (!sess || !tpg)
goto out;
rc = target_check_scsi2_reservation_conflict(cmd);
if (rc == 1)
goto out;
else if (rc < 0) {
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
ret = -EINVAL;
goto out;
}
ret = 0;
spin_lock(&dev->dev_reservation_lock);
if (dev->dev_reserved_node_acl &&
(dev->dev_reserved_node_acl != sess->se_node_acl)) {
pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
tpg->se_tpg_tfo->get_fabric_name());
pr_err("Original reserver LUN: %u %s\n",
cmd->se_lun->unpacked_lun,
dev->dev_reserved_node_acl->initiatorname);
pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u"
" from %s \n", cmd->se_lun->unpacked_lun,
cmd->se_deve->mapped_lun,
sess->se_node_acl->initiatorname);
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
ret = -EINVAL;
goto out_unlock;
}
dev->dev_reserved_node_acl = sess->se_node_acl;
dev->dev_flags |= DF_SPC2_RESERVATIONS;
if (sess->sess_bin_isid != 0) {
dev->dev_res_bin_isid = sess->sess_bin_isid;
dev->dev_flags |= DF_SPC2_RESERVATIONS_WITH_ISID;
}
pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u"
" for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
sess->se_node_acl->initiatorname);
out_unlock:
spin_unlock(&dev->dev_reservation_lock);
out:
if (!ret)
target_complete_cmd(cmd, GOOD);
return ret;
}
/*
* Begin SPC-3/SPC-4 Persistent Reservations emulation support
*
* This function is called by those initiator ports who are *NOT*
* the active PR reservation holder when a reservation is present.
*/
static int core_scsi3_pr_seq_non_holder(
struct se_cmd *cmd,
unsigned char *cdb,
u32 pr_reg_type)
{
struct se_dev_entry *se_deve;
struct se_session *se_sess = cmd->se_sess;
int other_cdb = 0, ignore_reg;
int registered_nexus = 0, ret = 1; /* Conflict by default */
int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
int we = 0; /* Write Exclusive */
int legacy = 0; /* Act like a legacy device and return
* RESERVATION CONFLICT on some CDBs */
/*
* A legacy SPC-2 reservation is being held.
*/
if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS)
return core_scsi2_reservation_seq_non_holder(cmd,
cdb, pr_reg_type);
se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
/*
* Determine if the registration should be ignored due to
* non-matching ISIDs in core_scsi3_pr_reservation_check().
*/
ignore_reg = (pr_reg_type & 0x80000000);
if (ignore_reg)
pr_reg_type &= ~0x80000000;
switch (pr_reg_type) {
case PR_TYPE_WRITE_EXCLUSIVE:
we = 1;
case PR_TYPE_EXCLUSIVE_ACCESS:
/*
* Some commands are only allowed for the persistent reservation
* holder.
*/
if ((se_deve->def_pr_registered) && !(ignore_reg))
registered_nexus = 1;
break;
case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
we = 1;
case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
/*
* Some commands are only allowed for registered I_T Nexuses.
*/
reg_only = 1;
if ((se_deve->def_pr_registered) && !(ignore_reg))
registered_nexus = 1;
break;
case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
we = 1;
case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
/*
* Each registered I_T Nexus is a reservation holder.
*/
all_reg = 1;
if ((se_deve->def_pr_registered) && !(ignore_reg))
registered_nexus = 1;
break;
default:
return -EINVAL;
}
/*
* Referenced from spc4r17 table 45 for *NON* PR holder access
*/
switch (cdb[0]) {
case SECURITY_PROTOCOL_IN:
if (registered_nexus)
return 0;
ret = (we) ? 0 : 1;
break;
case MODE_SENSE:
case MODE_SENSE_10:
case READ_ATTRIBUTE:
case READ_BUFFER:
case RECEIVE_DIAGNOSTIC:
if (legacy) {
ret = 1;
break;
}
if (registered_nexus) {
ret = 0;
break;
}
ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
break;
case PERSISTENT_RESERVE_OUT:
/*
* This follows PERSISTENT_RESERVE_OUT service actions that
* are allowed in the presence of various reservations.
* See spc4r17, table 46
*/
switch (cdb[1] & 0x1f) {
case PRO_CLEAR:
case PRO_PREEMPT:
case PRO_PREEMPT_AND_ABORT:
ret = (registered_nexus) ? 0 : 1;
break;
case PRO_REGISTER:
case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
ret = 0;
break;
case PRO_REGISTER_AND_MOVE:
case PRO_RESERVE:
ret = 1;
break;
case PRO_RELEASE:
ret = (registered_nexus) ? 0 : 1;
break;
default:
pr_err("Unknown PERSISTENT_RESERVE_OUT service"
" action: 0x%02x\n", cdb[1] & 0x1f);
return -EINVAL;
}
break;
case RELEASE:
case RELEASE_10:
/* Handled by CRH=1 in target_scsi2_reservation_release() */
ret = 0;
break;
case RESERVE:
case RESERVE_10:
/* Handled by CRH=1 in target_scsi2_reservation_reserve() */
ret = 0;
break;
case TEST_UNIT_READY:
ret = (legacy) ? 1 : 0; /* Conflict for legacy */
break;
case MAINTENANCE_IN:
switch (cdb[1] & 0x1f) {
case MI_MANAGEMENT_PROTOCOL_IN:
if (registered_nexus) {
ret = 0;
break;
}
ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
break;
case MI_REPORT_SUPPORTED_OPERATION_CODES:
case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
if (legacy) {
ret = 1;
break;
}
if (registered_nexus) {
ret = 0;
break;
}
ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
break;
case MI_REPORT_ALIASES:
case MI_REPORT_IDENTIFYING_INFORMATION:
case MI_REPORT_PRIORITY:
case MI_REPORT_TARGET_PGS:
case MI_REPORT_TIMESTAMP:
ret = 0; /* Allowed */
break;
default:
pr_err("Unknown MI Service Action: 0x%02x\n",
(cdb[1] & 0x1f));
return -EINVAL;
}
break;
case ACCESS_CONTROL_IN:
case ACCESS_CONTROL_OUT:
case INQUIRY:
case LOG_SENSE:
case READ_MEDIA_SERIAL_NUMBER:
case REPORT_LUNS:
case REQUEST_SENSE:
case PERSISTENT_RESERVE_IN:
ret = 0; /*/ Allowed CDBs */
break;
default:
other_cdb = 1;
break;
}
/*
* Case where the CDB is explicitly allowed in the above switch
* statement.
*/
if (!ret && !other_cdb) {
pr_debug("Allowing explict CDB: 0x%02x for %s"
" reservation holder\n", cdb[0],
core_scsi3_pr_dump_type(pr_reg_type));
return ret;
}
/*
* Check if write exclusive initiator ports *NOT* holding the
* WRITE_EXCLUSIVE_* reservation.
*/
if ((we) && !(registered_nexus)) {
if (cmd->data_direction == DMA_TO_DEVICE) {
/*
* Conflict for write exclusive
*/
pr_debug("%s Conflict for unregistered nexus"
" %s CDB: 0x%02x to %s reservation\n",
transport_dump_cmd_direction(cmd),
se_sess->se_node_acl->initiatorname, cdb[0],
core_scsi3_pr_dump_type(pr_reg_type));
return 1;
} else {
/*
* Allow non WRITE CDBs for all Write Exclusive
* PR TYPEs to pass for registered and
* non-registered_nexuxes NOT holding the reservation.
*
* We only make noise for the unregisterd nexuses,
* as we expect registered non-reservation holding
* nexuses to issue CDBs.
*/
if (!registered_nexus) {
pr_debug("Allowing implict CDB: 0x%02x"
" for %s reservation on unregistered"
" nexus\n", cdb[0],
core_scsi3_pr_dump_type(pr_reg_type));
}
return 0;
}
} else if ((reg_only) || (all_reg)) {
if (registered_nexus) {
/*
* For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
* allow commands from registered nexuses.
*/
pr_debug("Allowing implict CDB: 0x%02x for %s"
" reservation\n", cdb[0],
core_scsi3_pr_dump_type(pr_reg_type));
return 0;
}
}
pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
" for %s reservation\n", transport_dump_cmd_direction(cmd),
(registered_nexus) ? "" : "un",
se_sess->se_node_acl->initiatorname, cdb[0],
core_scsi3_pr_dump_type(pr_reg_type));
return 1; /* Conflict by default */
}
static u32 core_scsi3_pr_generation(struct se_device *dev)
{
struct se_subsystem_dev *su_dev = dev->se_sub_dev;
u32 prg;
/*
* PRGeneration field shall contain the value of a 32-bit wrapping
* counter mainted by the device server.
*
* Note that this is done regardless of Active Persist across
* Target PowerLoss (APTPL)
*
* See spc4r17 section 6.3.12 READ_KEYS service action
*/
spin_lock(&dev->dev_reservation_lock);
prg = su_dev->t10_pr.pr_generation++;
spin_unlock(&dev->dev_reservation_lock);
return prg;
}
static int core_scsi3_pr_reservation_check(
struct se_cmd *cmd,
u32 *pr_reg_type)
{
struct se_device *dev = cmd->se_dev;
struct se_session *sess = cmd->se_sess;
int ret;
if (!sess)
return 0;
/*
* A legacy SPC-2 reservation is being held.
*/
if (dev->dev_flags & DF_SPC2_RESERVATIONS)
return core_scsi2_reservation_check(cmd, pr_reg_type);
spin_lock(&dev->dev_reservation_lock);
if (!dev->dev_pr_res_holder) {
spin_unlock(&dev->dev_reservation_lock);
return 0;
}
*pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) {
spin_unlock(&dev->dev_reservation_lock);
return -EINVAL;
}
if (!dev->dev_pr_res_holder->isid_present_at_reg) {
spin_unlock(&dev->dev_reservation_lock);
return 0;
}
ret = (dev->dev_pr_res_holder->pr_reg_bin_isid ==
sess->sess_bin_isid) ? 0 : -EINVAL;
/*
* Use bit in *pr_reg_type to notify ISID mismatch in
* core_scsi3_pr_seq_non_holder().
*/
if (ret != 0)
*pr_reg_type |= 0x80000000;
spin_unlock(&dev->dev_reservation_lock);
return ret;
}
static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
struct se_device *dev,
struct se_node_acl *nacl,
struct se_dev_entry *deve,
unsigned char *isid,
u64 sa_res_key,
int all_tg_pt,
int aptpl)
{
struct se_subsystem_dev *su_dev = dev->se_sub_dev;
struct t10_pr_registration *pr_reg;
pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
if (!pr_reg) {
pr_err("Unable to allocate struct t10_pr_registration\n");
return NULL;
}
pr_reg->pr_aptpl_buf = kzalloc(su_dev->t10_pr.pr_aptpl_buf_len,
GFP_ATOMIC);
if (!pr_reg->pr_aptpl_buf) {
pr_err("Unable to allocate pr_reg->pr_aptpl_buf\n");
kmem_cache_free(t10_pr_reg_cache, pr_reg);
return NULL;
}
INIT_LIST_HEAD(&pr_reg->pr_reg_list);
INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
atomic_set(&pr_reg->pr_res_holders, 0);
pr_reg->pr_reg_nacl = nacl;
pr_reg->pr_reg_deve = deve;
pr_reg->pr_res_mapped_lun = deve->mapped_lun;
pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun;
pr_reg->pr_res_key = sa_res_key;
pr_reg->pr_reg_all_tg_pt = all_tg_pt;
pr_reg->pr_reg_aptpl = aptpl;
pr_reg->pr_reg_tg_pt_lun = deve->se_lun;
/*
* If an ISID value for this SCSI Initiator Port exists,
* save it to the registration now.
*/
if (isid != NULL) {
pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
pr_reg->isid_present_at_reg = 1;
}
return pr_reg;
}
static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
/*
* Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
* modes.
*/
static struct t10_pr_registration *__core_scsi3_alloc_registration(
struct se_device *dev,
struct se_node_acl *nacl,
struct se_dev_entry *deve,
unsigned char *isid,
u64 sa_res_key,
int all_tg_pt,
int aptpl)
{
struct se_dev_entry *deve_tmp;
struct se_node_acl *nacl_tmp;
struct se_port *port, *port_tmp;
struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
int ret;
/*
* Create a registration for the I_T Nexus upon which the
* PROUT REGISTER was received.
*/
pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid,
sa_res_key, all_tg_pt, aptpl);
if (!pr_reg)
return NULL;
/*
* Return pointer to pr_reg for ALL_TG_PT=0
*/
if (!all_tg_pt)
return pr_reg;
/*
* Create list of matching SCSI Initiator Port registrations
* for ALL_TG_PT=1
*/
spin_lock(&dev->se_port_lock);
list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) {
atomic_inc(&port->sep_tg_pt_ref_cnt);
smp_mb__after_atomic_inc();
spin_unlock(&dev->se_port_lock);
spin_lock_bh(&port->sep_alua_lock);
list_for_each_entry(deve_tmp, &port->sep_alua_list,
alua_port_list) {
/*
* This pointer will be NULL for demo mode MappedLUNs
* that have not been make explict via a ConfigFS
* MappedLUN group for the SCSI Initiator Node ACL.
*/
if (!deve_tmp->se_lun_acl)
continue;
nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl;
/*
* Skip the matching struct se_node_acl that is allocated
* above..
*/
if (nacl == nacl_tmp)
continue;
/*
* Only perform PR registrations for target ports on
* the same fabric module as the REGISTER w/ ALL_TG_PT=1
* arrived.
*/
if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
continue;
/*
* Look for a matching Initiator Node ACL in ASCII format
*/
if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
continue;
atomic_inc(&deve_tmp->pr_ref_count);
smp_mb__after_atomic_inc();
spin_unlock_bh(&port->sep_alua_lock);
/*
* Grab a configfs group dependency that is released
* for the exception path at label out: below, or upon
* completion of adding ALL_TG_PT=1 registrations in
* __core_scsi3_add_registration()
*/
ret = core_scsi3_lunacl_depend_item(deve_tmp);
if (ret < 0) {
pr_err("core_scsi3_lunacl_depend"
"_item() failed\n");
atomic_dec(&port->sep_tg_pt_ref_cnt);
smp_mb__after_atomic_dec();
atomic_dec(&deve_tmp->pr_ref_count);
smp_mb__after_atomic_dec();
goto out;
}
/*
* Located a matching SCSI Initiator Port on a different
* port, allocate the pr_reg_atp and attach it to the
* pr_reg->pr_reg_atp_list that will be processed once
* the original *pr_reg is processed in
* __core_scsi3_add_registration()
*/
pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
nacl_tmp, deve_tmp, NULL,
sa_res_key, all_tg_pt, aptpl);
if (!pr_reg_atp) {
atomic_dec(&port->sep_tg_pt_ref_cnt);
smp_mb__after_atomic_dec();
atomic_dec(&deve_tmp->pr_ref_count);
smp_mb__after_atomic_dec();
core_scsi3_lunacl_undepend_item(deve_tmp);
goto out;
}
list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
&pr_reg->pr_reg_atp_list);
spin_lock_bh(&port->sep_alua_lock);
}
spin_unlock_bh(&port->sep_alua_lock);
spin_lock(&dev->se_port_lock);
atomic_dec(&port->sep_tg_pt_ref_cnt);
smp_mb__after_atomic_dec();
}
spin_unlock(&dev->se_port_lock);
return pr_reg;
out:
list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
&pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
}
kmem_cache_free(t10_pr_reg_cache, pr_reg);
return NULL;
}
int core_scsi3_alloc_aptpl_registration(
struct t10_reservation *pr_tmpl,
u64 sa_res_key,
unsigned char *i_port,
unsigned char *isid,
u32 mapped_lun,
unsigned char *t_port,
u16 tpgt,
u32 target_lun,
int res_holder,
int all_tg_pt,
u8 type)
{
struct t10_pr_registration *pr_reg;
if (!i_port || !t_port || !sa_res_key) {
pr_err("Illegal parameters for APTPL registration\n");
return -EINVAL;
}
pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
if (!pr_reg) {
pr_err("Unable to allocate struct t10_pr_registration\n");
return -ENOMEM;
}
pr_reg->pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, GFP_KERNEL);
INIT_LIST_HEAD(&pr_reg->pr_reg_list);
INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
atomic_set(&pr_reg->pr_res_holders, 0);
pr_reg->pr_reg_nacl = NULL;
pr_reg->pr_reg_deve = NULL;
pr_reg->pr_res_mapped_lun = mapped_lun;
pr_reg->pr_aptpl_target_lun = target_lun;
pr_reg->pr_res_key = sa_res_key;
pr_reg->pr_reg_all_tg_pt = all_tg_pt;
pr_reg->pr_reg_aptpl = 1;
pr_reg->pr_reg_tg_pt_lun = NULL;
pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
pr_reg->pr_res_type = type;
/*
* If an ISID value had been saved in APTPL metadata for this
* SCSI Initiator Port, restore it now.
*/
if (isid != NULL) {
pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
pr_reg->isid_present_at_reg = 1;
}
/*
* Copy the i_port and t_port information from caller.
*/
snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
pr_reg->pr_reg_tpgt = tpgt;
/*
* Set pr_res_holder from caller, the pr_reg who is the reservation
* holder will get it's pointer set in core_scsi3_aptpl_reserve() once
* the Initiator Node LUN ACL from the fabric module is created for
* this registration.
*/
pr_reg->pr_res_holder = res_holder;
list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
" metadata\n", (res_holder) ? "+reservation" : "");
return 0;
}
static void core_scsi3_aptpl_reserve(
struct se_device *dev,
struct se_portal_group *tpg,
struct se_node_acl *node_acl,
struct t10_pr_registration *pr_reg)
{
char i_buf[PR_REG_ISID_ID_LEN];
int prf_isid;
memset(i_buf, 0, PR_REG_ISID_ID_LEN);
prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
PR_REG_ISID_ID_LEN);
spin_lock(&dev->dev_reservation_lock);
dev->dev_pr_res_holder = pr_reg;
spin_unlock(&dev->dev_reservation_lock);
pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
" new reservation holder TYPE: %s ALL_TG_PT: %d\n",
tpg->se_tpg_tfo->get_fabric_name(),
core_scsi3_pr_dump_type(pr_reg->pr_res_type),
(pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
(prf_isid) ? &i_buf[0] : "");
}
static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
struct t10_pr_registration *, int, int);
static int __core_scsi3_check_aptpl_registration(
struct se_device *dev,
struct se_portal_group *tpg,
struct se_lun *lun,
u32 target_lun,
struct se_node_acl *nacl,
struct se_dev_entry *deve)
{
struct t10_pr_registration *pr_reg, *pr_reg_tmp;
struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
u16 tpgt;
memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
/*
* Copy Initiator Port information from struct se_node_acl
*/
snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
tpg->se_tpg_tfo->tpg_get_wwn(tpg));
tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
/*
* Look for the matching registrations+reservation from those
* created from APTPL metadata. Note that multiple registrations
* may exist for fabrics that use ISIDs in their SCSI Initiator Port
* TransportIDs.
*/
spin_lock(&pr_tmpl->aptpl_reg_lock);
list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
pr_reg_aptpl_list) {
if (!strcmp(pr_reg->pr_iport, i_port) &&
(pr_reg->pr_res_mapped_lun == deve->mapped_lun) &&
!(strcmp(pr_reg->pr_tport, t_port)) &&
(pr_reg->pr_reg_tpgt == tpgt) &&
(pr_reg->pr_aptpl_target_lun == target_lun)) {
pr_reg->pr_reg_nacl = nacl;
pr_reg->pr_reg_deve = deve;
pr_reg->pr_reg_tg_pt_lun = lun;
list_del(&pr_reg->pr_reg_aptpl_list);
spin_unlock(&pr_tmpl->aptpl_reg_lock);
/*
* At this point all of the pointers in *pr_reg will
* be setup, so go ahead and add the registration.
*/
__core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
/*
* If this registration is the reservation holder,
* make that happen now..
*/
if (pr_reg->pr_res_holder)
core_scsi3_aptpl_reserve(dev, tpg,
nacl, pr_reg);
/*
* Reenable pr_aptpl_active to accept new metadata
* updates once the SCSI device is active again..
*/
spin_lock(&pr_tmpl->aptpl_reg_lock);
pr_tmpl->pr_aptpl_active = 1;
}
}
spin_unlock(&pr_tmpl->aptpl_reg_lock);
return 0;
}
int core_scsi3_check_aptpl_registration(
struct se_device *dev,
struct se_portal_group *tpg,
struct se_lun *lun,
struct se_lun_acl *lun_acl)
{
struct se_subsystem_dev *su_dev = dev->se_sub_dev;
struct se_node_acl *nacl = lun_acl->se_lun_nacl;
struct se_dev_entry *deve = nacl->device_list[lun_acl->mapped_lun];