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linux/drivers/target/target_core_pr.c
Wei Yongjun 609234e3b6 target: move the dereference below the NULL test 
The dereference should be moved below the NULL test.

spatch with a semantic match is used to found this.
(http://coccinelle.lip6.fr/)

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
2012-09-17 18:04:14 -07:00

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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 <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/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;
int ret = 0, rc;
if (!sess || !sess->se_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;
}
tpg = sess->se_tpg;
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;
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 || !sess->se_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;
tpg = sess->se_tpg;
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];
if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
return 0;
return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
lun->unpacked_lun, nacl, deve);
}
static void __core_scsi3_dump_registration(
struct target_core_fabric_ops *tfo,
struct se_device *dev,
struct se_node_acl *nacl,
struct t10_pr_registration *pr_reg,
int register_type)
{
struct se_portal_group *se_tpg = nacl->se_tpg;
char i_buf[PR_REG_ISID_ID_LEN];
int prf_isid;
memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
PR_REG_ISID_ID_LEN);
pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
" Node: %s%s\n", tfo->get_fabric_name(), (register_type == 2) ?
"_AND_MOVE" : (register_type == 1) ?
"_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
(prf_isid) ? i_buf : "");
pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
tfo->tpg_get_tag(se_tpg));
pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
" Port(s)\n", tfo->get_fabric_name(),
(pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
dev->transport->name);
pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
" 0x%08x APTPL: %d\n", tfo->get_fabric_name(),
pr_reg->pr_res_key, pr_reg->pr_res_generation,
pr_reg->pr_reg_aptpl);
}
/*
* this function can be called with struct se_device->dev_reservation_lock
* when register_move = 1
*/
static void __core_scsi3_add_registration(
struct se_device *dev,
struct se_node_acl *nacl,
struct t10_pr_registration *pr_reg,
int register_type,
int register_move)
{
struct se_subsystem_dev *su_dev = dev->se_sub_dev;
struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
/*
* Increment PRgeneration counter for struct se_device upon a successful
* REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
*
* Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
* action, the struct se_device->dev_reservation_lock will already be held,
* so we do not call core_scsi3_pr_generation() which grabs the lock
* for the REGISTER.
*/
pr_reg->pr_res_generation = (register_move) ?
su_dev->t10_pr.pr_generation++ :
core_scsi3_pr_generation(dev);
spin_lock(&pr_tmpl->registration_lock);
list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
pr_reg->pr_reg_deve->def_pr_registered = 1;
__core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
spin_unlock(&pr_tmpl->registration_lock);
/*
* Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
*/
if (!pr_reg->pr_reg_all_tg_pt || register_move)
return;
/*
* Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
* allocated in __core_scsi3_alloc_registration()
*/
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);
pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
spin_lock(&pr_tmpl->registration_lock);
list_add_tail(&pr_reg_tmp->pr_reg_list,
&pr_tmpl->registration_list);
pr_reg_tmp->pr_reg_deve->def_pr_registered = 1;
__core_scsi3_dump_registration(tfo, dev,
pr_reg_tmp->pr_reg_nacl, pr_reg_tmp,
register_type);
spin_unlock(&pr_tmpl->registration_lock);
/*
* Drop configfs group dependency reference from
* __core_scsi3_alloc_registration()
*/
core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
}
}
static int 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,
int register_type,
int register_move)
{
struct t10_pr_registration *pr_reg;
pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid,
sa_res_key, all_tg_pt, aptpl);
if (!pr_reg)
return -EPERM;
__core_scsi3_add_registration(dev, nacl, pr_reg,
register_type, register_move);
return 0;
}
static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
struct se_device *dev,
struct se_node_acl *nacl,
unsigned char *isid)
{
struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
struct t10_pr_registration *pr_reg, *pr_reg_tmp;
struct se_portal_group *tpg;
spin_lock(&pr_tmpl->registration_lock);
list_for_each_entry_safe(pr_reg, pr_reg_tmp,
&pr_tmpl->registration_list, pr_reg_list) {
/*
* First look for a matching struct se_node_acl
*/
if (pr_reg->pr_reg_nacl != nacl)
continue;
tpg = pr_reg->pr_reg_nacl->se_tpg;
/*
* If this registration does NOT contain a fabric provided
* ISID, then we have found a match.
*/
if (!pr_reg->isid_present_at_reg) {
/*
* Determine if this SCSI device server requires that
* SCSI Intiatior TransportID w/ ISIDs is enforced
* for fabric modules (iSCSI) requiring them.
*/
if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
if (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids)
continue;
}
atomic_inc(&pr_reg->pr_res_holders);
smp_mb__after_atomic_inc();
spin_unlock(&pr_tmpl->registration_lock);
return pr_reg;
}
/*
* If the *pr_reg contains a fabric defined ISID for multi-value
* SCSI Initiator Port TransportIDs, then we expect a valid
* matching ISID to be provided by the local SCSI Initiator Port.
*/
if (!isid)
continue;
if (strcmp(isid, pr_reg->pr_reg_isid))
continue;
atomic_inc(&pr_reg->pr_res_holders);
smp_mb__after_atomic_inc();
spin_unlock(&pr_tmpl->registration_lock);
return pr_reg;
}
spin_unlock(&pr_tmpl->registration_lock);
return NULL;
}
static struct t10_pr_registration *core_scsi3_locate_pr_reg(
struct se_device *dev,
struct se_node_acl *nacl,
struct se_session *sess)
{
struct se_portal_group *tpg = nacl->se_tpg;
unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
memset(&buf[0], 0, PR_REG_ISID_LEN);
tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
PR_REG_ISID_LEN);
isid_ptr = &buf[0];
}
return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
}
static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
{
atomic_dec(&pr_reg->pr_res_holders);
smp_mb__after_atomic_dec();
}
static int core_scsi3_check_implict_release(
struct se_device *dev,
struct t10_pr_registration *pr_reg)
{
struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
struct t10_pr_registration *pr_res_holder;
int ret = 0;
spin_lock(&dev->dev_reservation_lock);
pr_res_holder = dev->dev_pr_res_holder;
if (!pr_res_holder) {
spin_unlock(&dev->dev_reservation_lock);
return ret;
}
if (pr_res_holder == pr_reg) {
/*
* Perform an implict RELEASE if the registration that
* is being released is holding the reservation.
*
* From spc4r17, section 5.7.11.1:
*
* e) If the I_T nexus is the persistent reservation holder
* and the persistent reservation is not an all registrants
* type, then a PERSISTENT RESERVE OUT command with REGISTER
* service action or REGISTER AND IGNORE EXISTING KEY
* service action with the SERVICE ACTION RESERVATION KEY
* field set to zero (see 5.7.11.3).
*/
__core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0);
ret = 1;
/*
* For 'All Registrants' reservation types, all existing
* registrations are still processed as reservation holders
* in core_scsi3_pr_seq_non_holder() after the initial
* reservation holder is implictly released here.
*/
} else if (pr_reg->pr_reg_all_tg_pt &&
(!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
pr_reg->pr_reg_nacl->initiatorname)) &&
(pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
" UNREGISTER while existing reservation with matching"
" key 0x%016Lx is present from another SCSI Initiator"
" Port\n", pr_reg->pr_res_key);
ret = -EPERM;
}
spin_unlock(&dev->dev_reservation_lock);
return ret;
}
/*
* Called with struct t10_reservation->registration_lock held.
*/
static void __core_scsi3_free_registration(
struct se_device *dev,
struct t10_pr_registration *pr_reg,
struct list_head *preempt_and_abort_list,
int dec_holders)
{
struct target_core_fabric_ops *tfo =
pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
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);
pr_reg->pr_reg_deve->def_pr_registered = 0;
pr_reg->pr_reg_deve->pr_res_key = 0;
list_del(&pr_reg->pr_reg_list);
/*
* Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
* so call core_scsi3_put_pr_reg() to decrement our reference.
*/
if (dec_holders)
core_scsi3_put_pr_reg(pr_reg);
/*
* Wait until all reference from any other I_T nexuses for this
* *pr_reg have been released. Because list_del() is called above,
* the last core_scsi3_put_pr_reg(pr_reg) will release this reference
* count back to zero, and we release *pr_reg.
*/
while (atomic_read(&pr_reg->pr_res_holders) != 0) {
spin_unlock(&pr_tmpl->registration_lock);
pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
tfo->get_fabric_name());
cpu_relax();
spin_lock(&pr_tmpl->registration_lock);
}
pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
" Node: %s%s\n", tfo->get_fabric_name(),
pr_reg->pr_reg_nacl->initiatorname,
(prf_isid) ? &i_buf[0] : "");
pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
" Port(s)\n", tfo->get_fabric_name(),
(pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
dev->transport->name);
pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
" 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
pr_reg->pr_res_generation);
if (!preempt_and_abort_list) {
pr_reg->pr_reg_deve = NULL;
pr_reg->pr_reg_nacl = NULL;
kfree(pr_reg->pr_aptpl_buf);
kmem_cache_free(t10_pr_reg_cache, pr_reg);
return;
}
/*
* For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
* are released once the ABORT_TASK_SET has completed..
*/
list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
}
void core_scsi3_free_pr_reg_from_nacl(
struct se_device *dev,
struct se_node_acl *nacl)
{
struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
/*
* If the passed se_node_acl matches the reservation holder,
* release the reservation.
*/
spin_lock(&dev->dev_reservation_lock);
pr_res_holder = dev->dev_pr_res_holder;
if ((pr_res_holder != NULL) &&
(pr_res_holder->pr_reg_nacl == nacl))
__core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0);
spin_unlock(&dev->dev_reservation_lock);
/*
* Release any registration associated with the struct se_node_acl.
*/
spin_lock(&pr_tmpl->registration_lock);
list_for_each_entry_safe(pr_reg, pr_reg_tmp,
&pr_tmpl->registration_list, pr_reg_list) {
if (pr_reg->pr_reg_nacl != nacl)
continue;
__core_scsi3_free_registration(dev, pr_reg, NULL, 0);
}
spin_unlock(&pr_tmpl->registration_lock);
}
void core_scsi3_free_all_registrations(
struct se_device *dev)
{
struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
spin_lock(&dev->dev_reservation_lock);
pr_res_holder = dev->dev_pr_res_holder;
if (pr_res_holder != NULL) {
struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
__core_scsi3_complete_pro_release(dev, pr_res_nacl,
pr_res_holder, 0);
}
spin_unlock(&dev->dev_reservation_lock);
spin_lock(&pr_tmpl->registration_lock);
list_for_each_entry_safe(pr_reg, pr_reg_tmp,
&pr_tmpl->registration_list, pr_reg_list) {
__core_scsi3_free_registration(dev, pr_reg, NULL, 0);
}
spin_unlock(&pr_tmpl->registration_lock);
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) {
list_del(&pr_reg->pr_reg_aptpl_list);
kfree(pr_reg->pr_aptpl_buf);
kmem_cache_free(t10_pr_reg_cache, pr_reg);
}
spin_unlock(&pr_tmpl->aptpl_reg_lock);
}
static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
{
return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
&tpg->tpg_group.cg_item);
}
static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
{
configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
&tpg->tpg_group.cg_item);
atomic_dec(&tpg->tpg_pr_ref_count);
smp_mb__after_atomic_dec();
}
static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
{
struct se_portal_group *tpg = nacl->se_tpg;
if (nacl->dynamic_node_acl)
return 0;
return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
&nacl->acl_group.cg_item);
}
static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
{
struct se_portal_group *tpg = nacl->se_tpg;
if (nacl->dynamic_node_acl) {
atomic_dec(&nacl->acl_pr_ref_count);
smp_mb__after_atomic_dec();
return;
}
configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
&nacl->acl_group.cg_item);
atomic_dec(&nacl->acl_pr_ref_count);
smp_mb__after_atomic_dec();
}
static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
{
struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
struct se_node_acl *nacl;
struct se_portal_group *tpg;
/*
* For nacl->dynamic_node_acl=1
*/
if (!lun_acl)
return 0;
nacl = lun_acl->se_lun_nacl;
tpg = nacl->se_tpg;
return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
&lun_acl->se_lun_group.cg_item);
}
static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
{
struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
struct se_node_acl *nacl;
struct se_portal_group *tpg;
/*
* For nacl->dynamic_node_acl=1
*/
if (!lun_acl) {
atomic_dec(&se_deve->pr_ref_count);
smp_mb__after_atomic_dec();
return;
}
nacl = lun_acl->se_lun_nacl;
tpg = nacl->se_tpg;
configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
&lun_acl->se_lun_group.cg_item);
atomic_dec(&se_deve->pr_ref_count);
smp_mb__after_atomic_dec();
}
static int core_scsi3_decode_spec_i_port(
struct se_cmd *cmd,
struct se_portal_group *tpg,
unsigned char *l_isid,
u64 sa_res_key,
int all_tg_pt,
int aptpl)
{
struct se_device *dev = cmd->se_dev;
struct se_port *tmp_port;
struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
struct se_session *se_sess = cmd->se_sess;
struct se_node_acl *dest_node_acl = NULL;
struct se_dev_entry *dest_se_deve = NULL, *local_se_deve;
struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
LIST_HEAD(tid_dest_list);
struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
struct target_core_fabric_ops *tmp_tf_ops;
unsigned char *buf;
unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident;
char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
u32 tpdl, tid_len = 0;
int ret, dest_local_nexus, prf_isid;
u32 dest_rtpi = 0;
memset(dest_iport, 0, 64);
local_se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
/*
* Allocate a struct pr_transport_id_holder and setup the
* local_node_acl and local_se_deve pointers and add to
* struct list_head tid_dest_list for add registration
* processing in the loop of tid_dest_list below.
*/
tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
if (!tidh_new) {
pr_err("Unable to allocate tidh_new\n");
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -EINVAL;
}
INIT_LIST_HEAD(&tidh_new->dest_list);
tidh_new->dest_tpg = tpg;
tidh_new->dest_node_acl = se_sess->se_node_acl;
tidh_new->dest_se_deve = local_se_deve;
local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
se_sess->se_node_acl, local_se_deve, l_isid,
sa_res_key, all_tg_pt, aptpl);
if (!local_pr_reg) {
kfree(tidh_new);
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -ENOMEM;
}
tidh_new->dest_pr_reg = local_pr_reg;
/*
* The local I_T nexus does not hold any configfs dependances,
* so we set tid_h->dest_local_nexus=1 to prevent the
* configfs_undepend_item() calls in the tid_dest_list loops below.
*/
tidh_new->dest_local_nexus = 1;
list_add_tail(&tidh_new->dest_list, &tid_dest_list);
if (cmd->data_length < 28) {
pr_warn("SPC-PR: Received PR OUT parameter list"
" length too small: %u\n", cmd->data_length);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
buf = transport_kmap_data_sg(cmd);
/*
* For a PERSISTENT RESERVE OUT specify initiator ports payload,
* first extract TransportID Parameter Data Length, and make sure
* the value matches up to the SCSI expected data transfer length.
*/
tpdl = (buf[24] & 0xff) << 24;
tpdl |= (buf[25] & 0xff) << 16;
tpdl |= (buf[26] & 0xff) << 8;
tpdl |= buf[27] & 0xff;
if ((tpdl + 28) != cmd->data_length) {
pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
" does not equal CDB data_length: %u\n", tpdl,
cmd->data_length);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
/*
* Start processing the received transport IDs using the
* receiving I_T Nexus portal's fabric dependent methods to
* obtain the SCSI Initiator Port/Device Identifiers.
*/
ptr = &buf[28];
while (tpdl > 0) {
proto_ident = (ptr[0] & 0x0f);
dest_tpg = NULL;
spin_lock(&dev->se_port_lock);
list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) {
tmp_tpg = tmp_port->sep_tpg;
if (!tmp_tpg)
continue;
tmp_tf_ops = tmp_tpg->se_tpg_tfo;
if (!tmp_tf_ops)
continue;
if (!tmp_tf_ops->get_fabric_proto_ident ||
!tmp_tf_ops->tpg_parse_pr_out_transport_id)
continue;
/*
* Look for the matching proto_ident provided by
* the received TransportID
*/
tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg);
if (tmp_proto_ident != proto_ident)
continue;
dest_rtpi = tmp_port->sep_rtpi;
i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id(
tmp_tpg, (const char *)ptr, &tid_len,
&iport_ptr);
if (!i_str)
continue;
atomic_inc(&tmp_tpg->tpg_pr_ref_count);
smp_mb__after_atomic_inc();
spin_unlock(&dev->se_port_lock);
ret = core_scsi3_tpg_depend_item(tmp_tpg);
if (ret != 0) {
pr_err(" core_scsi3_tpg_depend_item()"
" for tmp_tpg\n");
atomic_dec(&tmp_tpg->tpg_pr_ref_count);
smp_mb__after_atomic_dec();
cmd->scsi_sense_reason =
TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
ret = -EINVAL;
goto out;
}
/*
* Locate the destination initiator ACL to be registered
* from the decoded fabric module specific TransportID
* at *i_str.
*/
spin_lock_irq(&tmp_tpg->acl_node_lock);
dest_node_acl = __core_tpg_get_initiator_node_acl(
tmp_tpg, i_str);
if (dest_node_acl) {
atomic_inc(&dest_node_acl->acl_pr_ref_count);
smp_mb__after_atomic_inc();
}
spin_unlock_irq(&tmp_tpg->acl_node_lock);
if (!dest_node_acl) {
core_scsi3_tpg_undepend_item(tmp_tpg);
spin_lock(&dev->se_port_lock);
continue;
}
ret = core_scsi3_nodeacl_depend_item(dest_node_acl);
if (ret != 0) {
pr_err("configfs_depend_item() failed"
" for dest_node_acl->acl_group\n");
atomic_dec(&dest_node_acl->acl_pr_ref_count);
smp_mb__after_atomic_dec();
core_scsi3_tpg_undepend_item(tmp_tpg);
cmd->scsi_sense_reason =
TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
ret = -EINVAL;
goto out;
}
dest_tpg = tmp_tpg;
pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
" %s Port RTPI: %hu\n",
dest_tpg->se_tpg_tfo->get_fabric_name(),
dest_node_acl->initiatorname, dest_rtpi);
spin_lock(&dev->se_port_lock);
break;
}
spin_unlock(&dev->se_port_lock);
if (!dest_tpg) {
pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
" dest_tpg\n");
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
" tid_len: %d for %s + %s\n",
dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
tpdl, tid_len, i_str, iport_ptr);
if (tid_len > tpdl) {
pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
" %u for Transport ID: %s\n", tid_len, ptr);
core_scsi3_nodeacl_undepend_item(dest_node_acl);
core_scsi3_tpg_undepend_item(dest_tpg);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
/*
* Locate the desintation struct se_dev_entry pointer for matching
* RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
* Target Port.
*/
dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
dest_rtpi);
if (!dest_se_deve) {
pr_err("Unable to locate %s dest_se_deve"
" from destination RTPI: %hu\n",
dest_tpg->se_tpg_tfo->get_fabric_name(),
dest_rtpi);
core_scsi3_nodeacl_undepend_item(dest_node_acl);
core_scsi3_tpg_undepend_item(dest_tpg);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
ret = core_scsi3_lunacl_depend_item(dest_se_deve);
if (ret < 0) {
pr_err("core_scsi3_lunacl_depend_item()"
" failed\n");
atomic_dec(&dest_se_deve->pr_ref_count);
smp_mb__after_atomic_dec();
core_scsi3_nodeacl_undepend_item(dest_node_acl);
core_scsi3_tpg_undepend_item(dest_tpg);
cmd->scsi_sense_reason =
TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
ret = -EINVAL;
goto out;
}
pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
" dest_se_deve mapped_lun: %u\n",
dest_tpg->se_tpg_tfo->get_fabric_name(),
dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
/*
* Skip any TransportIDs that already have a registration for
* this target port.
*/
pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
iport_ptr);
if (pr_reg_e) {
core_scsi3_put_pr_reg(pr_reg_e);
core_scsi3_lunacl_undepend_item(dest_se_deve);
core_scsi3_nodeacl_undepend_item(dest_node_acl);
core_scsi3_tpg_undepend_item(dest_tpg);
ptr += tid_len;
tpdl -= tid_len;
tid_len = 0;
continue;
}
/*
* Allocate a struct pr_transport_id_holder and setup
* the dest_node_acl and dest_se_deve pointers for the
* loop below.
*/
tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
GFP_KERNEL);
if (!tidh_new) {
pr_err("Unable to allocate tidh_new\n");
core_scsi3_lunacl_undepend_item(dest_se_deve);
core_scsi3_nodeacl_undepend_item(dest_node_acl);
core_scsi3_tpg_undepend_item(dest_tpg);
cmd->scsi_sense_reason =
TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
ret = -ENOMEM;
goto out;
}
INIT_LIST_HEAD(&tidh_new->dest_list);
tidh_new->dest_tpg = dest_tpg;
tidh_new->dest_node_acl = dest_node_acl;
tidh_new->dest_se_deve = dest_se_deve;
/*
* Allocate, but do NOT add the registration for the
* TransportID referenced SCSI Initiator port. This
* done because of the following from spc4r17 in section
* 6.14.3 wrt SPEC_I_PT:
*
* "If a registration fails for any initiator port (e.g., if th
* logical unit does not have enough resources available to
* hold the registration information), no registrations shall be
* made, and the command shall be terminated with
* CHECK CONDITION status."
*
* That means we call __core_scsi3_alloc_registration() here,
* and then call __core_scsi3_add_registration() in the
* 2nd loop which will never fail.
*/
dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
dest_node_acl, dest_se_deve, iport_ptr,
sa_res_key, all_tg_pt, aptpl);
if (!dest_pr_reg) {
core_scsi3_lunacl_undepend_item(dest_se_deve);
core_scsi3_nodeacl_undepend_item(dest_node_acl);
core_scsi3_tpg_undepend_item(dest_tpg);
kfree(tidh_new);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
tidh_new->dest_pr_reg = dest_pr_reg;
list_add_tail(&tidh_new->dest_list, &tid_dest_list);
ptr += tid_len;
tpdl -= tid_len;
tid_len = 0;
}
transport_kunmap_data_sg(cmd);
/*
* Go ahead and create a registrations from tid_dest_list for the
* SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
* and dest_se_deve.
*
* The SA Reservation Key from the PROUT is set for the
* registration, and ALL_TG_PT is also passed. ALL_TG_PT=1
* means that the TransportID Initiator port will be
* registered on all of the target ports in the SCSI target device
* ALL_TG_PT=0 means the registration will only be for the
* SCSI target port the PROUT REGISTER with SPEC_I_PT=1
* was received.
*/
list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
dest_tpg = tidh->dest_tpg;
dest_node_acl = tidh->dest_node_acl;
dest_se_deve = tidh->dest_se_deve;
dest_pr_reg = tidh->dest_pr_reg;
dest_local_nexus = tidh->dest_local_nexus;
list_del(&tidh->dest_list);
kfree(tidh);
memset(i_buf, 0, PR_REG_ISID_ID_LEN);
prf_isid = core_pr_dump_initiator_port(dest_pr_reg, &i_buf[0],
PR_REG_ISID_ID_LEN);
__core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
dest_pr_reg, 0, 0);
pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
" registered Transport ID for Node: %s%s Mapped LUN:"
" %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
dest_node_acl->initiatorname, (prf_isid) ?
&i_buf[0] : "", dest_se_deve->mapped_lun);
if (dest_local_nexus)
continue;
core_scsi3_lunacl_undepend_item(dest_se_deve);
core_scsi3_nodeacl_undepend_item(dest_node_acl);
core_scsi3_tpg_undepend_item(dest_tpg);
}
return 0;
out:
transport_kunmap_data_sg(cmd);
/*
* For the failure case, release everything from tid_dest_list
* including *dest_pr_reg and the configfs dependances..
*/
list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
dest_tpg = tidh->dest_tpg;
dest_node_acl = tidh->dest_node_acl;
dest_se_deve = tidh->dest_se_deve;
dest_pr_reg = tidh->dest_pr_reg;
dest_local_nexus = tidh->dest_local_nexus;
list_del(&tidh->dest_list);
kfree(tidh);
/*
* Release any extra ALL_TG_PT=1 registrations for
* the SPEC_I_PT=1 case.
*/
list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
&dest_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);
}
kfree(dest_pr_reg->pr_aptpl_buf);
kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
if (dest_local_nexus)
continue;
core_scsi3_lunacl_undepend_item(dest_se_deve);
core_scsi3_nodeacl_undepend_item(dest_node_acl);
core_scsi3_tpg_undepend_item(dest_tpg);
}
return ret;
}
/*
* Called with struct se_device->dev_reservation_lock held
*/
static int __core_scsi3_update_aptpl_buf(
struct se_device *dev,
unsigned char *buf,
u32 pr_aptpl_buf_len,
int clear_aptpl_metadata)
{
struct se_lun *lun;
struct se_portal_group *tpg;
struct se_subsystem_dev *su_dev = dev->se_sub_dev;
struct t10_pr_registration *pr_reg;
unsigned char tmp[512], isid_buf[32];
ssize_t len = 0;
int reg_count = 0;
memset(buf, 0, pr_aptpl_buf_len);
/*
* Called to clear metadata once APTPL has been deactivated.
*/
if (clear_aptpl_metadata) {
snprintf(buf, pr_aptpl_buf_len,
"No Registrations or Reservations\n");
return 0;
}
/*
* Walk the registration list..
*/
spin_lock(&su_dev->t10_pr.registration_lock);
list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list,
pr_reg_list) {
tmp[0] = '\0';
isid_buf[0] = '\0';
tpg = pr_reg->pr_reg_nacl->se_tpg;
lun = pr_reg->pr_reg_tg_pt_lun;
/*
* Write out any ISID value to APTPL metadata that was included
* in the original registration.
*/
if (pr_reg->isid_present_at_reg)
snprintf(isid_buf, 32, "initiator_sid=%s\n",
pr_reg->pr_reg_isid);
/*
* Include special metadata if the pr_reg matches the
* reservation holder.
*/
if (dev->dev_pr_res_holder == pr_reg) {
snprintf(tmp, 512, "PR_REG_START: %d"
"\ninitiator_fabric=%s\n"
"initiator_node=%s\n%s"
"sa_res_key=%llu\n"
"res_holder=1\nres_type=%02x\n"
"res_scope=%02x\nres_all_tg_pt=%d\n"
"mapped_lun=%u\n", reg_count,
tpg->se_tpg_tfo->get_fabric_name(),
pr_reg->pr_reg_nacl->initiatorname, isid_buf,
pr_reg->pr_res_key, pr_reg->pr_res_type,
pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
pr_reg->pr_res_mapped_lun);
} else {
snprintf(tmp, 512, "PR_REG_START: %d\n"
"initiator_fabric=%s\ninitiator_node=%s\n%s"
"sa_res_key=%llu\nres_holder=0\n"
"res_all_tg_pt=%d\nmapped_lun=%u\n",
reg_count, tpg->se_tpg_tfo->get_fabric_name(),
pr_reg->pr_reg_nacl->initiatorname, isid_buf,
pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
pr_reg->pr_res_mapped_lun);
}
if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
pr_err("Unable to update renaming"
" APTPL metadata\n");
spin_unlock(&su_dev->t10_pr.registration_lock);
return -EMSGSIZE;
}
len += sprintf(buf+len, "%s", tmp);
/*
* Include information about the associated SCSI target port.
*/
snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
"tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
" %d\n", tpg->se_tpg_tfo->get_fabric_name(),
tpg->se_tpg_tfo->tpg_get_wwn(tpg),
tpg->se_tpg_tfo->tpg_get_tag(tpg),
lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count);
if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
pr_err("Unable to update renaming"
" APTPL metadata\n");
spin_unlock(&su_dev->t10_pr.registration_lock);
return -EMSGSIZE;
}
len += sprintf(buf+len, "%s", tmp);
reg_count++;
}
spin_unlock(&su_dev->t10_pr.registration_lock);
if (!reg_count)
len += sprintf(buf+len, "No Registrations or Reservations");
return 0;
}
static int core_scsi3_update_aptpl_buf(
struct se_device *dev,
unsigned char *buf,
u32 pr_aptpl_buf_len,
int clear_aptpl_metadata)
{
int ret;
spin_lock(&dev->dev_reservation_lock);
ret = __core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
clear_aptpl_metadata);
spin_unlock(&dev->dev_reservation_lock);
return ret;
}
/*
* Called with struct se_device->aptpl_file_mutex held
*/
static int __core_scsi3_write_aptpl_to_file(
struct se_device *dev,
unsigned char *buf,
u32 pr_aptpl_buf_len)
{
struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
struct file *file;
struct iovec iov[1];
mm_segment_t old_fs;
int flags = O_RDWR | O_CREAT | O_TRUNC;
char path[512];
int ret;
memset(iov, 0, sizeof(struct iovec));
memset(path, 0, 512);
if (strlen(&wwn->unit_serial[0]) >= 512) {
pr_err("WWN value for struct se_device does not fit"
" into path buffer\n");
return -EMSGSIZE;
}
snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
file = filp_open(path, flags, 0600);
if (IS_ERR(file) || !file || !file->f_dentry) {
pr_err("filp_open(%s) for APTPL metadata"
" failed\n", path);
return IS_ERR(file) ? PTR_ERR(file) : -ENOENT;
}
iov[0].iov_base = &buf[0];
if (!pr_aptpl_buf_len)
iov[0].iov_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */
else
iov[0].iov_len = pr_aptpl_buf_len;
old_fs = get_fs();
set_fs(get_ds());
ret = vfs_writev(file, &iov[0], 1, &file->f_pos);
set_fs(old_fs);
if (ret < 0) {
pr_debug("Error writing APTPL metadata file: %s\n", path);
filp_close(file, NULL);
return -EIO;
}
filp_close(file, NULL);
return 0;
}
static int core_scsi3_update_and_write_aptpl(
struct se_device *dev,
unsigned char *in_buf,
u32 in_pr_aptpl_buf_len)
{
unsigned char null_buf[64], *buf;
u32 pr_aptpl_buf_len;
int ret, clear_aptpl_metadata = 0;
/*
* Can be called with a NULL pointer from PROUT service action CLEAR
*/
if (!in_buf) {
memset(null_buf, 0, 64);
buf = &null_buf[0];
/*
* This will clear the APTPL metadata to:
* "No Registrations or Reservations" status
*/
pr_aptpl_buf_len = 64;
clear_aptpl_metadata = 1;
} else {
buf = in_buf;
pr_aptpl_buf_len = in_pr_aptpl_buf_len;
}
ret = core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
clear_aptpl_metadata);
if (ret != 0)
return ret;
/*
* __core_scsi3_write_aptpl_to_file() will call strlen()
* on the passed buf to determine pr_aptpl_buf_len.
*/
ret = __core_scsi3_write_aptpl_to_file(dev, buf, 0);
if (ret != 0)
return ret;
return ret;
}
static int core_scsi3_emulate_pro_register(
struct se_cmd *cmd,
u64 res_key,
u64 sa_res_key,
int aptpl,
int all_tg_pt,
int spec_i_pt,
int ignore_key)
{
struct se_session *se_sess = cmd->se_sess;
struct se_device *dev = cmd->se_dev;
struct se_dev_entry *se_deve;
struct se_lun *se_lun = cmd->se_lun;
struct se_portal_group *se_tpg;
struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp, *pr_reg_e;
struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
/* Used for APTPL metadata w/ UNREGISTER */
unsigned char *pr_aptpl_buf = NULL;
unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
int pr_holder = 0, ret = 0, type;
if (!se_sess || !se_lun) {
pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -EINVAL;
}
se_tpg = se_sess->se_tpg;
se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
PR_REG_ISID_LEN);
isid_ptr = &isid_buf[0];
}
/*
* Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
*/
pr_reg_e = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
if (!pr_reg_e) {
if (res_key) {
pr_warn("SPC-3 PR: Reservation Key non-zero"
" for SA REGISTER, returning CONFLICT\n");
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EINVAL;
}
/*
* Do nothing but return GOOD status.
*/
if (!sa_res_key)
return 0;
if (!spec_i_pt) {
/*
* Perform the Service Action REGISTER on the Initiator
* Port Endpoint that the PRO was received from on the
* Logical Unit of the SCSI device server.
*/
ret = core_scsi3_alloc_registration(cmd->se_dev,
se_sess->se_node_acl, se_deve, isid_ptr,
sa_res_key, all_tg_pt, aptpl,
ignore_key, 0);
if (ret != 0) {
pr_err("Unable to allocate"
" struct t10_pr_registration\n");
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
return -EINVAL;
}
} else {
/*
* Register both the Initiator port that received
* PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
* TransportID from Parameter list and loop through
* fabric dependent parameter list while calling
* logic from of core_scsi3_alloc_registration() for
* each TransportID provided SCSI Initiator Port/Device
*/
ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
isid_ptr, sa_res_key, all_tg_pt, aptpl);
if (ret != 0)
return ret;
}
/*
* Nothing left to do for the APTPL=0 case.
*/
if (!aptpl) {
pr_tmpl->pr_aptpl_active = 0;
core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
" REGISTER\n");
return 0;
}
/*
* Locate the newly allocated local I_T Nexus *pr_reg, and
* update the APTPL metadata information using its
* preallocated *pr_reg->pr_aptpl_buf.
*/
pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev,
se_sess->se_node_acl, se_sess);
ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
&pr_reg->pr_aptpl_buf[0],
pr_tmpl->pr_aptpl_buf_len);
if (!ret) {
pr_tmpl->pr_aptpl_active = 1;
pr_debug("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n");
}
core_scsi3_put_pr_reg(pr_reg);
return ret;
} else {
/*
* Locate the existing *pr_reg via struct se_node_acl pointers
*/
pr_reg = pr_reg_e;
type = pr_reg->pr_res_type;
if (!ignore_key) {
if (res_key != pr_reg->pr_res_key) {
pr_err("SPC-3 PR REGISTER: Received"
" res_key: 0x%016Lx does not match"
" existing SA REGISTER res_key:"
" 0x%016Lx\n", res_key,
pr_reg->pr_res_key);
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EINVAL;
}
}
if (spec_i_pt) {
pr_err("SPC-3 PR UNREGISTER: SPEC_I_PT"
" set while sa_res_key=0\n");
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
return -EINVAL;
}
/*
* An existing ALL_TG_PT=1 registration being released
* must also set ALL_TG_PT=1 in the incoming PROUT.
*/
if (pr_reg->pr_reg_all_tg_pt && !(all_tg_pt)) {
pr_err("SPC-3 PR UNREGISTER: ALL_TG_PT=1"
" registration exists, but ALL_TG_PT=1 bit not"
" present in received PROUT\n");
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
return -EINVAL;
}
/*
* Allocate APTPL metadata buffer used for UNREGISTER ops
*/
if (aptpl) {
pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len,
GFP_KERNEL);
if (!pr_aptpl_buf) {
pr_err("Unable to allocate"
" pr_aptpl_buf\n");
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason =
TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -EINVAL;
}
}
/*
* sa_res_key=0 Unregister Reservation Key for registered I_T
* Nexus sa_res_key=1 Change Reservation Key for registered I_T
* Nexus.
*/
if (!sa_res_key) {
pr_holder = core_scsi3_check_implict_release(
cmd->se_dev, pr_reg);
if (pr_holder < 0) {
kfree(pr_aptpl_buf);
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EINVAL;
}
spin_lock(&pr_tmpl->registration_lock);
/*
* Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
* and matching pr_res_key.
*/
if (pr_reg->pr_reg_all_tg_pt) {
list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
&pr_tmpl->registration_list,
pr_reg_list) {
if (!pr_reg_p->pr_reg_all_tg_pt)
continue;
if (pr_reg_p->pr_res_key != res_key)
continue;
if (pr_reg == pr_reg_p)
continue;
if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
pr_reg_p->pr_reg_nacl->initiatorname))
continue;
__core_scsi3_free_registration(dev,
pr_reg_p, NULL, 0);
}
}
/*
* Release the calling I_T Nexus registration now..
*/
__core_scsi3_free_registration(cmd->se_dev, pr_reg,
NULL, 1);
/*
* From spc4r17, section 5.7.11.3 Unregistering
*
* If the persistent reservation is a registrants only
* type, the device server shall establish a unit
* attention condition for the initiator port associated
* with every registered I_T nexus except for the I_T
* nexus on which the PERSISTENT RESERVE OUT command was
* received, with the additional sense code set to
* RESERVATIONS RELEASED.
*/
if (pr_holder &&
((type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
(type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY))) {
list_for_each_entry(pr_reg_p,
&pr_tmpl->registration_list,
pr_reg_list) {
core_scsi3_ua_allocate(
pr_reg_p->pr_reg_nacl,
pr_reg_p->pr_res_mapped_lun,
0x2A,
ASCQ_2AH_RESERVATIONS_RELEASED);
}
}
spin_unlock(&pr_tmpl->registration_lock);
if (!aptpl) {
pr_tmpl->pr_aptpl_active = 0;
core_scsi3_update_and_write_aptpl(dev, NULL, 0);
pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
" for UNREGISTER\n");
return 0;
}
ret = core_scsi3_update_and_write_aptpl(dev,
&pr_aptpl_buf[0],
pr_tmpl->pr_aptpl_buf_len);
if (!ret) {
pr_tmpl->pr_aptpl_active = 1;
pr_debug("SPC-3 PR: Set APTPL Bit Activated"
" for UNREGISTER\n");
}
kfree(pr_aptpl_buf);
return ret;
} else {
/*
* Increment PRgeneration counter for struct se_device"
* upon a successful REGISTER, see spc4r17 section 6.3.2
* READ_KEYS service action.
*/
pr_reg->pr_res_generation = core_scsi3_pr_generation(
cmd->se_dev);
pr_reg->pr_res_key = sa_res_key;
pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
" Key for %s to: 0x%016Lx PRgeneration:"
" 0x%08x\n", cmd->se_tfo->get_fabric_name(),
(ignore_key) ? "_AND_IGNORE_EXISTING_KEY" : "",
pr_reg->pr_reg_nacl->initiatorname,
pr_reg->pr_res_key, pr_reg->pr_res_generation);
if (!aptpl) {
pr_tmpl->pr_aptpl_active = 0;
core_scsi3_update_and_write_aptpl(dev, NULL, 0);
core_scsi3_put_pr_reg(pr_reg);
pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
" for REGISTER\n");
return 0;
}
ret = core_scsi3_update_and_write_aptpl(dev,
&pr_aptpl_buf[0],
pr_tmpl->pr_aptpl_buf_len);
if (!ret) {
pr_tmpl->pr_aptpl_active = 1;
pr_debug("SPC-3 PR: Set APTPL Bit Activated"
" for REGISTER\n");
}
kfree(pr_aptpl_buf);
core_scsi3_put_pr_reg(pr_reg);
}
}
return 0;
}
unsigned char *core_scsi3_pr_dump_type(int type)
{
switch (type) {
case PR_TYPE_WRITE_EXCLUSIVE:
return "Write Exclusive Access";
case PR_TYPE_EXCLUSIVE_ACCESS:
return "Exclusive Access";
case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
return "Write Exclusive Access, Registrants Only";
case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
return "Exclusive Access, Registrants Only";
case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
return "Write Exclusive Access, All Registrants";
case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
return "Exclusive Access, All Registrants";
default:
break;
}
return "Unknown SPC-3 PR Type";
}
static int core_scsi3_pro_reserve(
struct se_cmd *cmd,
struct se_device *dev,
int type,
int scope,
u64 res_key)
{
struct se_session *se_sess = cmd->se_sess;
struct se_lun *se_lun = cmd->se_lun;
struct t10_pr_registration *pr_reg, *pr_res_holder;
struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
char i_buf[PR_REG_ISID_ID_LEN];
int ret, prf_isid;
memset(i_buf, 0, PR_REG_ISID_ID_LEN);
if (!se_sess || !se_lun) {
pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -EINVAL;
}
/*
* Locate the existing *pr_reg via struct se_node_acl pointers
*/
pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
se_sess);
if (!pr_reg) {
pr_err("SPC-3 PR: Unable to locate"
" PR_REGISTERED *pr_reg for RESERVE\n");
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -EINVAL;
}
/*
* From spc4r17 Section 5.7.9: Reserving:
*
* An application client creates a persistent reservation by issuing
* a PERSISTENT RESERVE OUT command with RESERVE service action through
* a registered I_T nexus with the following parameters:
* a) RESERVATION KEY set to the value of the reservation key that is
* registered with the logical unit for the I_T nexus; and
*/
if (res_key != pr_reg->pr_res_key) {
pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
" does not match existing SA REGISTER res_key:"
" 0x%016Lx\n", res_key, pr_reg->pr_res_key);
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EINVAL;
}
/*
* From spc4r17 Section 5.7.9: Reserving:
*
* From above:
* b) TYPE field and SCOPE field set to the persistent reservation
* being created.
*
* Only one persistent reservation is allowed at a time per logical unit
* and that persistent reservation has a scope of LU_SCOPE.
*/
if (scope != PR_SCOPE_LU_SCOPE) {
pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
return -EINVAL;
}
/*
* See if we have an existing PR reservation holder pointer at
* struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
* *pr_res_holder.
*/
spin_lock(&dev->dev_reservation_lock);
pr_res_holder = dev->dev_pr_res_holder;
if (pr_res_holder) {
/*
* From spc4r17 Section 5.7.9: Reserving:
*
* If the device server receives a PERSISTENT RESERVE OUT
* command from an I_T nexus other than a persistent reservation
* holder (see 5.7.10) that attempts to create a persistent
* reservation when a persistent reservation already exists for
* the logical unit, then the command shall be completed with
* RESERVATION CONFLICT status.
*/
if (pr_res_holder != pr_reg) {
struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
pr_err("SPC-3 PR: Attempted RESERVE from"
" [%s]: %s while reservation already held by"
" [%s]: %s, returning RESERVATION_CONFLICT\n",
cmd->se_tfo->get_fabric_name(),
se_sess->se_node_acl->initiatorname,
pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
pr_res_holder->pr_reg_nacl->initiatorname);
spin_unlock(&dev->dev_reservation_lock);
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EINVAL;
}
/*
* From spc4r17 Section 5.7.9: Reserving:
*
* If a persistent reservation holder attempts to modify the
* type or scope of an existing persistent reservation, the
* command shall be completed with RESERVATION CONFLICT status.
*/
if ((pr_res_holder->pr_res_type != type) ||
(pr_res_holder->pr_res_scope != scope)) {
struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
pr_err("SPC-3 PR: Attempted RESERVE from"
" [%s]: %s trying to change TYPE and/or SCOPE,"
" while reservation already held by [%s]: %s,"
" returning RESERVATION_CONFLICT\n",
cmd->se_tfo->get_fabric_name(),
se_sess->se_node_acl->initiatorname,
pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
pr_res_holder->pr_reg_nacl->initiatorname);
spin_unlock(&dev->dev_reservation_lock);
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EINVAL;
}
/*
* From spc4r17 Section 5.7.9: Reserving:
*
* If the device server receives a PERSISTENT RESERVE OUT
* command with RESERVE service action where the TYPE field and
* the SCOPE field contain the same values as the existing type
* and scope from a persistent reservation holder, it shall not
* make any change to the existing persistent reservation and
* shall completethe command with GOOD status.
*/
spin_unlock(&dev->dev_reservation_lock);
core_scsi3_put_pr_reg(pr_reg);
return 0;
}
/*
* Otherwise, our *pr_reg becomes the PR reservation holder for said
* TYPE/SCOPE. Also set the received scope and type in *pr_reg.
*/
pr_reg->pr_res_scope = scope;
pr_reg->pr_res_type = type;
pr_reg->pr_res_holder = 1;
dev->dev_pr_res_holder = pr_reg;
prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
PR_REG_ISID_ID_LEN);
pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
" reservation holder TYPE: %s ALL_TG_PT: %d\n",
cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
(pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
cmd->se_tfo->get_fabric_name(),
se_sess->se_node_acl->initiatorname,
(prf_isid) ? &i_buf[0] : "");
spin_unlock(&dev->dev_reservation_lock);
if (pr_tmpl->pr_aptpl_active) {
ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
&pr_reg->pr_aptpl_buf[0],
pr_tmpl->pr_aptpl_buf_len);
if (!ret)
pr_debug("SPC-3 PR: Updated APTPL metadata"
" for RESERVE\n");
}
core_scsi3_put_pr_reg(pr_reg);
return 0;
}
static int core_scsi3_emulate_pro_reserve(
struct se_cmd *cmd,
int type,
int scope,
u64 res_key)
{
struct se_device *dev = cmd->se_dev;
int ret = 0;
switch (type) {
case PR_TYPE_WRITE_EXCLUSIVE:
case PR_TYPE_EXCLUSIVE_ACCESS:
case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
ret = core_scsi3_pro_reserve(cmd, dev, type, scope, res_key);
break;
default:
pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
" 0x%02x\n", type);
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
return -EINVAL;
}
return ret;
}
/*
* Called with struct se_device->dev_reservation_lock held.
*/
static void __core_scsi3_complete_pro_release(
struct se_device *dev,
struct se_node_acl *se_nacl,
struct t10_pr_registration *pr_reg,
int explict)
{
struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
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);
/*
* Go ahead and release the current PR reservation holder.
*/
dev->dev_pr_res_holder = NULL;
pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
" reservation holder TYPE: %s ALL_TG_PT: %d\n",
tfo->get_fabric_name(), (explict) ? "explict" : "implict",
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] RELEASE Node: %s%s\n",
tfo->get_fabric_name(), se_nacl->initiatorname,
(prf_isid) ? &i_buf[0] : "");
/*
* Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
*/
pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
}
static int core_scsi3_emulate_pro_release(
struct se_cmd *cmd,
int type,
int scope,
u64 res_key)
{
struct se_device *dev = cmd->se_dev;
struct se_session *se_sess = cmd->se_sess;
struct se_lun *se_lun = cmd->se_lun;
struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
int ret, all_reg = 0;
if (!se_sess || !se_lun) {
pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -EINVAL;
}
/*
* Locate the existing *pr_reg via struct se_node_acl pointers
*/
pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
if (!pr_reg) {
pr_err("SPC-3 PR: Unable to locate"
" PR_REGISTERED *pr_reg for RELEASE\n");
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -EINVAL;
}
/*
* From spc4r17 Section 5.7.11.2 Releasing:
*
* If there is no persistent reservation or in response to a persistent
* reservation release request from a registered I_T nexus that is not a
* persistent reservation holder (see 5.7.10), the device server shall
* do the following:
*
* a) Not release the persistent reservation, if any;
* b) Not remove any registrations; and
* c) Complete the command with GOOD status.
*/
spin_lock(&dev->dev_reservation_lock);
pr_res_holder = dev->dev_pr_res_holder;
if (!pr_res_holder) {
/*
* No persistent reservation, return GOOD status.
*/
spin_unlock(&dev->dev_reservation_lock);
core_scsi3_put_pr_reg(pr_reg);
return 0;
}
if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
(pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
all_reg = 1;
if ((all_reg == 0) && (pr_res_holder != pr_reg)) {
/*
* Non 'All Registrants' PR Type cases..
* Release request from a registered I_T nexus that is not a
* persistent reservation holder. return GOOD status.
*/
spin_unlock(&dev->dev_reservation_lock);
core_scsi3_put_pr_reg(pr_reg);
return 0;
}
/*
* From spc4r17 Section 5.7.11.2 Releasing:
*
* Only the persistent reservation holder (see 5.7.10) is allowed to
* release a persistent reservation.
*
* An application client releases the persistent reservation by issuing
* a PERSISTENT RESERVE OUT command with RELEASE service action through
* an I_T nexus that is a persistent reservation holder with the
* following parameters:
*
* a) RESERVATION KEY field set to the value of the reservation key
* that is registered with the logical unit for the I_T nexus;
*/
if (res_key != pr_reg->pr_res_key) {
pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
" does not match existing SA REGISTER res_key:"
" 0x%016Lx\n", res_key, pr_reg->pr_res_key);
spin_unlock(&dev->dev_reservation_lock);
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EINVAL;
}
/*
* From spc4r17 Section 5.7.11.2 Releasing and above:
*
* b) TYPE field and SCOPE field set to match the persistent
* reservation being released.
*/
if ((pr_res_holder->pr_res_type != type) ||
(pr_res_holder->pr_res_scope != scope)) {
struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
pr_err("SPC-3 PR RELEASE: Attempted to release"
" reservation from [%s]: %s with different TYPE "
"and/or SCOPE while reservation already held by"
" [%s]: %s, returning RESERVATION_CONFLICT\n",
cmd->se_tfo->get_fabric_name(),
se_sess->se_node_acl->initiatorname,
pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
pr_res_holder->pr_reg_nacl->initiatorname);
spin_unlock(&dev->dev_reservation_lock);
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EINVAL;
}
/*
* In response to a persistent reservation release request from the
* persistent reservation holder the device server shall perform a
* release by doing the following as an uninterrupted series of actions:
* a) Release the persistent reservation;
* b) Not remove any registration(s);
* c) If the released persistent reservation is a registrants only type
* or all registrants type persistent reservation,
* the device server shall establish a unit attention condition for
* the initiator port associated with every regis-
* tered I_T nexus other than I_T nexus on which the PERSISTENT
* RESERVE OUT command with RELEASE service action was received,
* with the additional sense code set to RESERVATIONS RELEASED; and
* d) If the persistent reservation is of any other type, the device
* server shall not establish a unit attention condition.
*/
__core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
pr_reg, 1);
spin_unlock(&dev->dev_reservation_lock);
if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
(type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
(type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
(type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
/*
* If no UNIT ATTENTION conditions will be established for
* PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
* go ahead and check for APTPL=1 update+write below
*/
goto write_aptpl;
}
spin_lock(&pr_tmpl->registration_lock);
list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
pr_reg_list) {
/*
* Do not establish a UNIT ATTENTION condition
* for the calling I_T Nexus
*/
if (pr_reg_p == pr_reg)
continue;
core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl,
pr_reg_p->pr_res_mapped_lun,
0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
}
spin_unlock(&pr_tmpl->registration_lock);
write_aptpl:
if (pr_tmpl->pr_aptpl_active) {
ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
&pr_reg->pr_aptpl_buf[0],
pr_tmpl->pr_aptpl_buf_len);
if (!ret)
pr_debug("SPC-3 PR: Updated APTPL metadata for RELEASE\n");
}
core_scsi3_put_pr_reg(pr_reg);
return 0;
}
static int core_scsi3_emulate_pro_clear(
struct se_cmd *cmd,
u64 res_key)
{
struct se_device *dev = cmd->se_dev;
struct se_node_acl *pr_reg_nacl;
struct se_session *se_sess = cmd->se_sess;
struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
u32 pr_res_mapped_lun = 0;
int calling_it_nexus = 0;
/*
* Locate the existing *pr_reg via struct se_node_acl pointers
*/
pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
se_sess->se_node_acl, se_sess);
if (!pr_reg_n) {
pr_err("SPC-3 PR: Unable to locate"
" PR_REGISTERED *pr_reg for CLEAR\n");
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -EINVAL;
}
/*
* From spc4r17 section 5.7.11.6, Clearing:
*
* Any application client may release the persistent reservation and
* remove all registrations from a device server by issuing a
* PERSISTENT RESERVE OUT command with CLEAR service action through a
* registered I_T nexus with the following parameter:
*
* a) RESERVATION KEY field set to the value of the reservation key
* that is registered with the logical unit for the I_T nexus.
*/
if (res_key != pr_reg_n->pr_res_key) {
pr_err("SPC-3 PR REGISTER: Received"
" res_key: 0x%016Lx does not match"
" existing SA REGISTER res_key:"
" 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
core_scsi3_put_pr_reg(pr_reg_n);
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EINVAL;
}
/*
* a) Release the persistent reservation, if any;
*/
spin_lock(&dev->dev_reservation_lock);
pr_res_holder = dev->dev_pr_res_holder;
if (pr_res_holder) {
struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
__core_scsi3_complete_pro_release(dev, pr_res_nacl,
pr_res_holder, 0);
}
spin_unlock(&dev->dev_reservation_lock);
/*
* b) Remove all registration(s) (see spc4r17 5.7.7);
*/
spin_lock(&pr_tmpl->registration_lock);
list_for_each_entry_safe(pr_reg, pr_reg_tmp,
&pr_tmpl->registration_list, pr_reg_list) {
calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
pr_reg_nacl = pr_reg->pr_reg_nacl;
pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
__core_scsi3_free_registration(dev, pr_reg, NULL,
calling_it_nexus);
/*
* e) Establish a unit attention condition for the initiator
* port associated with every registered I_T nexus other
* than the I_T nexus on which the PERSISTENT RESERVE OUT
* command with CLEAR service action was received, with the
* additional sense code set to RESERVATIONS PREEMPTED.
*/
if (!calling_it_nexus)
core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun,
0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
}
spin_unlock(&pr_tmpl->registration_lock);
pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
cmd->se_tfo->get_fabric_name());
if (pr_tmpl->pr_aptpl_active) {
core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
pr_debug("SPC-3 PR: Updated APTPL metadata"
" for CLEAR\n");
}
core_scsi3_pr_generation(dev);
return 0;
}
/*
* Called with struct se_device->dev_reservation_lock held.
*/
static void __core_scsi3_complete_pro_preempt(
struct se_device *dev,
struct t10_pr_registration *pr_reg,
struct list_head *preempt_and_abort_list,
int type,
int scope,
int abort)
{
struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
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);
/*
* Do an implict RELEASE of the existing reservation.
*/
if (dev->dev_pr_res_holder)
__core_scsi3_complete_pro_release(dev, nacl,
dev->dev_pr_res_holder, 0);
dev->dev_pr_res_holder = pr_reg;
pr_reg->pr_res_holder = 1;
pr_reg->pr_res_type = type;
pr_reg->pr_res_scope = scope;
pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
" reservation holder TYPE: %s ALL_TG_PT: %d\n",
tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
core_scsi3_pr_dump_type(type),
(pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
nacl->initiatorname, (prf_isid) ? &i_buf[0] : "");
/*
* For PREEMPT_AND_ABORT, add the preempting reservation's
* struct t10_pr_registration to the list that will be compared
* against received CDBs..
*/
if (preempt_and_abort_list)
list_add_tail(&pr_reg->pr_reg_abort_list,
preempt_and_abort_list);
}
static void core_scsi3_release_preempt_and_abort(
struct list_head *preempt_and_abort_list,
struct t10_pr_registration *pr_reg_holder)
{
struct t10_pr_registration *pr_reg, *pr_reg_tmp;
list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
pr_reg_abort_list) {
list_del(&pr_reg->pr_reg_abort_list);
if (pr_reg_holder == pr_reg)
continue;
if (pr_reg->pr_res_holder) {
pr_warn("pr_reg->pr_res_holder still set\n");
continue;
}
pr_reg->pr_reg_deve = NULL;
pr_reg->pr_reg_nacl = NULL;
kfree(pr_reg->pr_aptpl_buf);
kmem_cache_free(t10_pr_reg_cache, pr_reg);
}
}
static int core_scsi3_pro_preempt(
struct se_cmd *cmd,
int type,
int scope,
u64 res_key,
u64 sa_res_key,
int abort)
{
struct se_device *dev = cmd->se_dev;
struct se_node_acl *pr_reg_nacl;
struct se_session *se_sess = cmd->se_sess;
LIST_HEAD(preempt_and_abort_list);
struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
u32 pr_res_mapped_lun = 0;
int all_reg = 0, calling_it_nexus = 0, released_regs = 0;
int prh_type = 0, prh_scope = 0, ret;
if (!se_sess) {
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -EINVAL;
}
pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
se_sess);
if (!pr_reg_n) {
pr_err("SPC-3 PR: Unable to locate"
" PR_REGISTERED *pr_reg for PREEMPT%s\n",
(abort) ? "_AND_ABORT" : "");
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EINVAL;
}
if (pr_reg_n->pr_res_key != res_key) {
core_scsi3_put_pr_reg(pr_reg_n);
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EINVAL;
}
if (scope != PR_SCOPE_LU_SCOPE) {
pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
core_scsi3_put_pr_reg(pr_reg_n);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
return -EINVAL;
}
spin_lock(&dev->dev_reservation_lock);
pr_res_holder = dev->dev_pr_res_holder;
if (pr_res_holder &&
((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
(pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
all_reg = 1;
if (!all_reg && !sa_res_key) {
spin_unlock(&dev->dev_reservation_lock);
core_scsi3_put_pr_reg(pr_reg_n);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
return -EINVAL;
}
/*
* From spc4r17, section 5.7.11.4.4 Removing Registrations:
*
* If the SERVICE ACTION RESERVATION KEY field does not identify a
* persistent reservation holder or there is no persistent reservation
* holder (i.e., there is no persistent reservation), then the device
* server shall perform a preempt by doing the following in an
* uninterrupted series of actions. (See below..)
*/
if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
/*
* No existing or SA Reservation Key matching reservations..
*
* PROUT SA PREEMPT with All Registrant type reservations are
* allowed to be processed without a matching SA Reservation Key
*/
spin_lock(&pr_tmpl->registration_lock);
list_for_each_entry_safe(pr_reg, pr_reg_tmp,
&pr_tmpl->registration_list, pr_reg_list) {
/*
* Removing of registrations in non all registrants
* type reservations without a matching SA reservation
* key.
*
* a) Remove the registrations for all I_T nexuses
* specified by the SERVICE ACTION RESERVATION KEY
* field;
* b) Ignore the contents of the SCOPE and TYPE fields;
* c) Process tasks as defined in 5.7.1; and
* d) Establish a unit attention condition for the
* initiator port associated with every I_T nexus
* that lost its registration other than the I_T
* nexus on which the PERSISTENT RESERVE OUT command
* was received, with the additional sense code set
* to REGISTRATIONS PREEMPTED.
*/
if (!all_reg) {
if (pr_reg->pr_res_key != sa_res_key)
continue;
calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
pr_reg_nacl = pr_reg->pr_reg_nacl;
pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
__core_scsi3_free_registration(dev, pr_reg,
(abort) ? &preempt_and_abort_list :
NULL, calling_it_nexus);
released_regs++;
} else {
/*
* Case for any existing all registrants type
* reservation, follow logic in spc4r17 section
* 5.7.11.4 Preempting, Table 52 and Figure 7.
*
* For a ZERO SA Reservation key, release
* all other registrations and do an implict
* release of active persistent reservation.
*
* For a non-ZERO SA Reservation key, only
* release the matching reservation key from
* registrations.
*/
if ((sa_res_key) &&
(pr_reg->pr_res_key != sa_res_key))
continue;
calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
if (calling_it_nexus)
continue;
pr_reg_nacl = pr_reg->pr_reg_nacl;
pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
__core_scsi3_free_registration(dev, pr_reg,
(abort) ? &preempt_and_abort_list :
NULL, 0);
released_regs++;
}
if (!calling_it_nexus)
core_scsi3_ua_allocate(pr_reg_nacl,
pr_res_mapped_lun, 0x2A,
ASCQ_2AH_REGISTRATIONS_PREEMPTED);
}
spin_unlock(&pr_tmpl->registration_lock);
/*
* If a PERSISTENT RESERVE OUT with a PREEMPT service action or
* a PREEMPT AND ABORT service action sets the SERVICE ACTION
* RESERVATION KEY field to a value that does not match any
* registered reservation key, then the device server shall
* complete the command with RESERVATION CONFLICT status.
*/
if (!released_regs) {
spin_unlock(&dev->dev_reservation_lock);
core_scsi3_put_pr_reg(pr_reg_n);
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EINVAL;
}
/*
* For an existing all registrants type reservation
* with a zero SA rservation key, preempt the existing
* reservation with the new PR type and scope.
*/
if (pr_res_holder && all_reg && !(sa_res_key)) {
__core_scsi3_complete_pro_preempt(dev, pr_reg_n,
(abort) ? &preempt_and_abort_list : NULL,
type, scope, abort);
if (abort)
core_scsi3_release_preempt_and_abort(
&preempt_and_abort_list, pr_reg_n);
}
spin_unlock(&dev->dev_reservation_lock);
if (pr_tmpl->pr_aptpl_active) {
ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
&pr_reg_n->pr_aptpl_buf[0],
pr_tmpl->pr_aptpl_buf_len);
if (!ret)
pr_debug("SPC-3 PR: Updated APTPL"
" metadata for PREEMPT%s\n", (abort) ?
"_AND_ABORT" : "");
}
core_scsi3_put_pr_reg(pr_reg_n);
core_scsi3_pr_generation(cmd->se_dev);
return 0;
}
/*
* The PREEMPTing SA reservation key matches that of the
* existing persistent reservation, first, we check if
* we are preempting our own reservation.
* From spc4r17, section 5.7.11.4.3 Preempting
* persistent reservations and registration handling
*
* If an all registrants persistent reservation is not
* present, it is not an error for the persistent
* reservation holder to preempt itself (i.e., a
* PERSISTENT RESERVE OUT with a PREEMPT service action
* or a PREEMPT AND ABORT service action with the
* SERVICE ACTION RESERVATION KEY value equal to the
* persistent reservation holder's reservation key that
* is received from the persistent reservation holder).
* In that case, the device server shall establish the
* new persistent reservation and maintain the
* registration.
*/
prh_type = pr_res_holder->pr_res_type;
prh_scope = pr_res_holder->pr_res_scope;
/*
* If the SERVICE ACTION RESERVATION KEY field identifies a
* persistent reservation holder (see 5.7.10), the device
* server shall perform a preempt by doing the following as
* an uninterrupted series of actions:
*
* a) Release the persistent reservation for the holder
* identified by the SERVICE ACTION RESERVATION KEY field;
*/
if (pr_reg_n != pr_res_holder)
__core_scsi3_complete_pro_release(dev,
pr_res_holder->pr_reg_nacl,
dev->dev_pr_res_holder, 0);
/*
* b) Remove the registrations for all I_T nexuses identified
* by the SERVICE ACTION RESERVATION KEY field, except the
* I_T nexus that is being used for the PERSISTENT RESERVE
* OUT command. If an all registrants persistent reservation
* is present and the SERVICE ACTION RESERVATION KEY field
* is set to zero, then all registrations shall be removed
* except for that of the I_T nexus that is being used for
* the PERSISTENT RESERVE OUT command;
*/
spin_lock(&pr_tmpl->registration_lock);
list_for_each_entry_safe(pr_reg, pr_reg_tmp,
&pr_tmpl->registration_list, pr_reg_list) {
calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
if (calling_it_nexus)
continue;
if (pr_reg->pr_res_key != sa_res_key)
continue;
pr_reg_nacl = pr_reg->pr_reg_nacl;
pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
__core_scsi3_free_registration(dev, pr_reg,
(abort) ? &preempt_and_abort_list : NULL,
calling_it_nexus);
/*
* e) Establish a unit attention condition for the initiator
* port associated with every I_T nexus that lost its
* persistent reservation and/or registration, with the
* additional sense code set to REGISTRATIONS PREEMPTED;
*/
core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
ASCQ_2AH_REGISTRATIONS_PREEMPTED);
}
spin_unlock(&pr_tmpl->registration_lock);
/*
* c) Establish a persistent reservation for the preempting
* I_T nexus using the contents of the SCOPE and TYPE fields;
*/
__core_scsi3_complete_pro_preempt(dev, pr_reg_n,
(abort) ? &preempt_and_abort_list : NULL,
type, scope, abort);
/*
* d) Process tasks as defined in 5.7.1;
* e) See above..
* f) If the type or scope has changed, then for every I_T nexus
* whose reservation key was not removed, except for the I_T
* nexus on which the PERSISTENT RESERVE OUT command was
* received, the device server shall establish a unit
* attention condition for the initiator port associated with
* that I_T nexus, with the additional sense code set to
* RESERVATIONS RELEASED. If the type or scope have not
* changed, then no unit attention condition(s) shall be
* established for this reason.
*/
if ((prh_type != type) || (prh_scope != scope)) {
spin_lock(&pr_tmpl->registration_lock);
list_for_each_entry_safe(pr_reg, pr_reg_tmp,
&pr_tmpl->registration_list, pr_reg_list) {
calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
if (calling_it_nexus)
continue;
core_scsi3_ua_allocate(pr_reg->pr_reg_nacl,
pr_reg->pr_res_mapped_lun, 0x2A,
ASCQ_2AH_RESERVATIONS_RELEASED);
}
spin_unlock(&pr_tmpl->registration_lock);
}
spin_unlock(&dev->dev_reservation_lock);
/*
* Call LUN_RESET logic upon list of struct t10_pr_registration,
* All received CDBs for the matching existing reservation and
* registrations undergo ABORT_TASK logic.
*
* From there, core_scsi3_release_preempt_and_abort() will
* release every registration in the list (which have already
* been removed from the primary pr_reg list), except the
* new persistent reservation holder, the calling Initiator Port.
*/
if (abort) {
core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
pr_reg_n);
}
if (pr_tmpl->pr_aptpl_active) {
ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
&pr_reg_n->pr_aptpl_buf[0],
pr_tmpl->pr_aptpl_buf_len);
if (!ret)
pr_debug("SPC-3 PR: Updated APTPL metadata for PREEMPT"
"%s\n", (abort) ? "_AND_ABORT" : "");
}
core_scsi3_put_pr_reg(pr_reg_n);
core_scsi3_pr_generation(cmd->se_dev);
return 0;
}
static int core_scsi3_emulate_pro_preempt(
struct se_cmd *cmd,
int type,
int scope,
u64 res_key,
u64 sa_res_key,
int abort)
{
int ret = 0;
switch (type) {
case PR_TYPE_WRITE_EXCLUSIVE:
case PR_TYPE_EXCLUSIVE_ACCESS:
case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
ret = core_scsi3_pro_preempt(cmd, type, scope,
res_key, sa_res_key, abort);
break;
default:
pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
" Type: 0x%02x\n", (abort) ? "_AND_ABORT" : "", type);
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
return -EINVAL;
}
return ret;
}
static int core_scsi3_emulate_pro_register_and_move(
struct se_cmd *cmd,
u64 res_key,
u64 sa_res_key,
int aptpl,
int unreg)
{
struct se_session *se_sess = cmd->se_sess;
struct se_device *dev = cmd->se_dev;
struct se_dev_entry *dest_se_deve = NULL;
struct se_lun *se_lun = cmd->se_lun;
struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
struct se_port *se_port;
struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
unsigned char *buf;
unsigned char *initiator_str;
char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
u32 tid_len, tmp_tid_len;
int new_reg = 0, type, scope, ret, matching_iname, prf_isid;
unsigned short rtpi;
unsigned char proto_ident;
if (!se_sess || !se_lun) {
pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -EINVAL;
}
memset(dest_iport, 0, 64);
memset(i_buf, 0, PR_REG_ISID_ID_LEN);
se_tpg = se_sess->se_tpg;
tf_ops = se_tpg->se_tpg_tfo;
/*
* Follow logic from spc4r17 Section 5.7.8, Table 50 --
* Register behaviors for a REGISTER AND MOVE service action
*
* Locate the existing *pr_reg via struct se_node_acl pointers
*/
pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
se_sess);
if (!pr_reg) {
pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
" *pr_reg for REGISTER_AND_MOVE\n");
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -EINVAL;
}
/*
* The provided reservation key much match the existing reservation key
* provided during this initiator's I_T nexus registration.
*/
if (res_key != pr_reg->pr_res_key) {
pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
" res_key: 0x%016Lx does not match existing SA REGISTER"
" res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EINVAL;
}
/*
* The service active reservation key needs to be non zero
*/
if (!sa_res_key) {
pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
" sa_res_key\n");
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
return -EINVAL;
}
/*
* Determine the Relative Target Port Identifier where the reservation
* will be moved to for the TransportID containing SCSI initiator WWN
* information.
*/
buf = transport_kmap_data_sg(cmd);
rtpi = (buf[18] & 0xff) << 8;
rtpi |= buf[19] & 0xff;
tid_len = (buf[20] & 0xff) << 24;
tid_len |= (buf[21] & 0xff) << 16;
tid_len |= (buf[22] & 0xff) << 8;
tid_len |= buf[23] & 0xff;
transport_kunmap_data_sg(cmd);
buf = NULL;
if ((tid_len + 24) != cmd->data_length) {
pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
" does not equal CDB data_length: %u\n", tid_len,
cmd->data_length);
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
return -EINVAL;
}
spin_lock(&dev->se_port_lock);
list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) {
if (se_port->sep_rtpi != rtpi)
continue;
dest_se_tpg = se_port->sep_tpg;
if (!dest_se_tpg)
continue;
dest_tf_ops = dest_se_tpg->se_tpg_tfo;
if (!dest_tf_ops)
continue;
atomic_inc(&dest_se_tpg->tpg_pr_ref_count);
smp_mb__after_atomic_inc();
spin_unlock(&dev->se_port_lock);
ret = core_scsi3_tpg_depend_item(dest_se_tpg);
if (ret != 0) {
pr_err("core_scsi3_tpg_depend_item() failed"
" for dest_se_tpg\n");
atomic_dec(&dest_se_tpg->tpg_pr_ref_count);
smp_mb__after_atomic_dec();
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -EINVAL;
}
spin_lock(&dev->se_port_lock);
break;
}
spin_unlock(&dev->se_port_lock);
if (!dest_se_tpg || !dest_tf_ops) {
pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
" fabric ops from Relative Target Port Identifier:"
" %hu\n", rtpi);
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
return -EINVAL;
}
buf = transport_kmap_data_sg(cmd);
proto_ident = (buf[24] & 0x0f);
pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
" 0x%02x\n", proto_ident);
if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) {
pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
" proto_ident: 0x%02x does not match ident: 0x%02x"
" from fabric: %s\n", proto_ident,
dest_tf_ops->get_fabric_proto_ident(dest_se_tpg),
dest_tf_ops->get_fabric_name());
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) {
pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not"
" containg a valid tpg_parse_pr_out_transport_id"
" function pointer\n");
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
ret = -EINVAL;
goto out;
}
initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg,
(const char *)&buf[24], &tmp_tid_len, &iport_ptr);
if (!initiator_str) {
pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
" initiator_str from Transport ID\n");
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
transport_kunmap_data_sg(cmd);
buf = NULL;
pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
" %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
"port" : "device", initiator_str, (iport_ptr != NULL) ?
iport_ptr : "");
/*
* If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
* action specifies a TransportID that is the same as the initiator port
* of the I_T nexus for the command received, 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.
*/
pr_reg_nacl = pr_reg->pr_reg_nacl;
matching_iname = (!strcmp(initiator_str,
pr_reg_nacl->initiatorname)) ? 1 : 0;
if (!matching_iname)
goto after_iport_check;
if (!iport_ptr || !pr_reg->isid_present_at_reg) {
pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
" matches: %s on received I_T Nexus\n", initiator_str,
pr_reg_nacl->initiatorname);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
" matches: %s %s on received I_T Nexus\n",
initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
pr_reg->pr_reg_isid);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
after_iport_check:
/*
* Locate the destination struct se_node_acl from the received Transport ID
*/
spin_lock_irq(&dest_se_tpg->acl_node_lock);
dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
initiator_str);
if (dest_node_acl) {
atomic_inc(&dest_node_acl->acl_pr_ref_count);
smp_mb__after_atomic_inc();
}
spin_unlock_irq(&dest_se_tpg->acl_node_lock);
if (!dest_node_acl) {
pr_err("Unable to locate %s dest_node_acl for"
" TransportID%s\n", dest_tf_ops->get_fabric_name(),
initiator_str);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
ret = core_scsi3_nodeacl_depend_item(dest_node_acl);
if (ret != 0) {
pr_err("core_scsi3_nodeacl_depend_item() for"
" dest_node_acl\n");
atomic_dec(&dest_node_acl->acl_pr_ref_count);
smp_mb__after_atomic_dec();
dest_node_acl = NULL;
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
" %s from TransportID\n", dest_tf_ops->get_fabric_name(),
dest_node_acl->initiatorname);
/*
* Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
* PORT IDENTIFIER.
*/
dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
if (!dest_se_deve) {
pr_err("Unable to locate %s dest_se_deve from RTPI:"
" %hu\n", dest_tf_ops->get_fabric_name(), rtpi);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
ret = core_scsi3_lunacl_depend_item(dest_se_deve);
if (ret < 0) {
pr_err("core_scsi3_lunacl_depend_item() failed\n");
atomic_dec(&dest_se_deve->pr_ref_count);
smp_mb__after_atomic_dec();
dest_se_deve = NULL;
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
ret = -EINVAL;
goto out;
}
pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
" ACL for dest_se_deve->mapped_lun: %u\n",
dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
dest_se_deve->mapped_lun);
/*
* A persistent reservation needs to already existing in order to
* successfully complete the REGISTER_AND_MOVE service action..
*/
spin_lock(&dev->dev_reservation_lock);
pr_res_holder = dev->dev_pr_res_holder;
if (!pr_res_holder) {
pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
" currently held\n");
spin_unlock(&dev->dev_reservation_lock);
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
ret = -EINVAL;
goto out;
}
/*
* The received on I_T Nexus must be the reservation holder.
*
* From spc4r17 section 5.7.8 Table 50 --
* Register behaviors for a REGISTER AND MOVE service action
*/
if (pr_res_holder != pr_reg) {
pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
" Nexus is not reservation holder\n");
spin_unlock(&dev->dev_reservation_lock);
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
ret = -EINVAL;
goto out;
}
/*
* From spc4r17 section 5.7.8: registering and moving reservation
*
* If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
* action is received and the established persistent reservation is a
* Write Exclusive - All Registrants type or Exclusive Access -
* All Registrants type reservation, then the command shall be completed
* with RESERVATION CONFLICT status.
*/
if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
(pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
" reservation for type: %s\n",
core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
spin_unlock(&dev->dev_reservation_lock);
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
ret = -EINVAL;
goto out;
}
pr_res_nacl = pr_res_holder->pr_reg_nacl;
/*
* b) Ignore the contents of the (received) SCOPE and TYPE fields;
*/
type = pr_res_holder->pr_res_type;
scope = pr_res_holder->pr_res_type;
/*
* c) Associate the reservation key specified in the SERVICE ACTION
* RESERVATION KEY field with the I_T nexus specified as the
* destination of the register and move, where:
* A) The I_T nexus is specified by the TransportID and the
* RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
* B) Regardless of the TransportID format used, the association for
* the initiator port is based on either the initiator port name
* (see 3.1.71) on SCSI transport protocols where port names are
* required or the initiator port identifier (see 3.1.70) on SCSI
* transport protocols where port names are not required;
* d) Register the reservation key specified in the SERVICE ACTION
* RESERVATION KEY field;
* e) Retain the reservation key specified in the SERVICE ACTION
* RESERVATION KEY field and associated information;
*
* Also, It is not an error for a REGISTER AND MOVE service action to
* register an I_T nexus that is already registered with the same
* reservation key or a different reservation key.
*/
dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
iport_ptr);
if (!dest_pr_reg) {
ret = core_scsi3_alloc_registration(cmd->se_dev,
dest_node_acl, dest_se_deve, iport_ptr,
sa_res_key, 0, aptpl, 2, 1);
if (ret != 0) {
spin_unlock(&dev->dev_reservation_lock);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
iport_ptr);
new_reg = 1;
}
/*
* f) Release the persistent reservation for the persistent reservation
* holder (i.e., the I_T nexus on which the
*/
__core_scsi3_complete_pro_release(dev, pr_res_nacl,
dev->dev_pr_res_holder, 0);
/*
* g) Move the persistent reservation to the specified I_T nexus using
* the same scope and type as the persistent reservation released in
* item f); and
*/
dev->dev_pr_res_holder = dest_pr_reg;
dest_pr_reg->pr_res_holder = 1;
dest_pr_reg->pr_res_type = type;
pr_reg->pr_res_scope = scope;
prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
PR_REG_ISID_ID_LEN);
/*
* Increment PRGeneration for existing registrations..
*/
if (!new_reg)
dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
spin_unlock(&dev->dev_reservation_lock);
pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
" created new reservation holder TYPE: %s on object RTPI:"
" %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
core_scsi3_pr_dump_type(type), rtpi,
dest_pr_reg->pr_res_generation);
pr_debug("SPC-3 PR Successfully moved reservation from"
" %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
(prf_isid) ? &i_buf[0] : "", dest_tf_ops->get_fabric_name(),
dest_node_acl->initiatorname, (iport_ptr != NULL) ?
iport_ptr : "");
/*
* It is now safe to release configfs group dependencies for destination
* of Transport ID Initiator Device/Port Identifier
*/
core_scsi3_lunacl_undepend_item(dest_se_deve);
core_scsi3_nodeacl_undepend_item(dest_node_acl);
core_scsi3_tpg_undepend_item(dest_se_tpg);
/*
* h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
* nexus on which PERSISTENT RESERVE OUT command was received.
*/
if (unreg) {
spin_lock(&pr_tmpl->registration_lock);
__core_scsi3_free_registration(dev, pr_reg, NULL, 1);
spin_unlock(&pr_tmpl->registration_lock);
} else
core_scsi3_put_pr_reg(pr_reg);
/*
* Clear the APTPL metadata if APTPL has been disabled, otherwise
* write out the updated metadata to struct file for this SCSI device.
*/
if (!aptpl) {
pr_tmpl->pr_aptpl_active = 0;
core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
" REGISTER_AND_MOVE\n");
} else {
pr_tmpl->pr_aptpl_active = 1;
ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
&dest_pr_reg->pr_aptpl_buf[0],
pr_tmpl->pr_aptpl_buf_len);
if (!ret)
pr_debug("SPC-3 PR: Set APTPL Bit Activated for"
" REGISTER_AND_MOVE\n");
}
transport_kunmap_data_sg(cmd);
core_scsi3_put_pr_reg(dest_pr_reg);
return 0;
out:
if (buf)
transport_kunmap_data_sg(cmd);
if (dest_se_deve)
core_scsi3_lunacl_undepend_item(dest_se_deve);
if (dest_node_acl)
core_scsi3_nodeacl_undepend_item(dest_node_acl);
core_scsi3_tpg_undepend_item(dest_se_tpg);
core_scsi3_put_pr_reg(pr_reg);
return ret;
}
static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
{
unsigned int __v1, __v2;
__v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
__v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
}
/*
* See spc4r17 section 6.14 Table 170
*/
int target_scsi3_emulate_pr_out(struct se_cmd *cmd)
{
unsigned char *cdb = &cmd->t_task_cdb[0];
unsigned char *buf;
u64 res_key, sa_res_key;
int sa, scope, type, aptpl;
int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
int ret;
/*
* Following spc2r20 5.5.1 Reservations overview:
*
* If a logical unit has been reserved by any RESERVE command and is
* still reserved by any initiator, all PERSISTENT RESERVE IN and all
* PERSISTENT RESERVE OUT commands shall conflict regardless of
* initiator or service action and shall terminate with a RESERVATION
* CONFLICT status.
*/
if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) {
pr_err("Received PERSISTENT_RESERVE CDB while legacy"
" SPC-2 reservation is held, returning"
" RESERVATION_CONFLICT\n");
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
ret = -EINVAL;
goto out;
}
/*
* FIXME: A NULL struct se_session pointer means an this is not coming from
* a $FABRIC_MOD's nexus, but from internal passthrough ops.
*/
if (!cmd->se_sess) {
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
ret = -EINVAL;
goto out;
}
if (cmd->data_length < 24) {
pr_warn("SPC-PR: Received PR OUT parameter list"
" length too small: %u\n", cmd->data_length);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
/*
* From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
*/
sa = (cdb[1] & 0x1f);
scope = (cdb[2] & 0xf0);
type = (cdb[2] & 0x0f);
buf = transport_kmap_data_sg(cmd);
/*
* From PERSISTENT_RESERVE_OUT parameter list (payload)
*/
res_key = core_scsi3_extract_reservation_key(&buf[0]);
sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
/*
* REGISTER_AND_MOVE uses a different SA parameter list containing
* SCSI TransportIDs.
*/
if (sa != PRO_REGISTER_AND_MOVE) {
spec_i_pt = (buf[20] & 0x08);
all_tg_pt = (buf[20] & 0x04);
aptpl = (buf[20] & 0x01);
} else {
aptpl = (buf[17] & 0x01);
unreg = (buf[17] & 0x02);
}
transport_kunmap_data_sg(cmd);
buf = NULL;
/*
* SPEC_I_PT=1 is only valid for Service action: REGISTER
*/
if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) {
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
/*
* From spc4r17 section 6.14:
*
* If the SPEC_I_PT bit is set to zero, the service action is not
* REGISTER AND MOVE, and the parameter list length is not 24, 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 PARAMETER LIST LENGTH ERROR.
*/
if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
(cmd->data_length != 24)) {
pr_warn("SPC-PR: Received PR OUT illegal parameter"
" list length: %u\n", cmd->data_length);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
/*
* (core_scsi3_emulate_pro_* function parameters
* are defined by spc4r17 Table 174:
* PERSISTENT_RESERVE_OUT service actions and valid parameters.
*/
switch (sa) {
case PRO_REGISTER:
ret = core_scsi3_emulate_pro_register(cmd,
res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 0);
break;
case PRO_RESERVE:
ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
break;
case PRO_RELEASE:
ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
break;
case PRO_CLEAR:
ret = core_scsi3_emulate_pro_clear(cmd, res_key);
break;
case PRO_PREEMPT:
ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
res_key, sa_res_key, 0);
break;
case PRO_PREEMPT_AND_ABORT:
ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
res_key, sa_res_key, 1);
break;
case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
ret = core_scsi3_emulate_pro_register(cmd,
0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 1);
break;
case PRO_REGISTER_AND_MOVE:
ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
sa_res_key, aptpl, unreg);
break;
default:
pr_err("Unknown PERSISTENT_RESERVE_OUT service"
" action: 0x%02x\n", cdb[1] & 0x1f);
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
ret = -EINVAL;
break;
}
out:
if (!ret)
target_complete_cmd(cmd, GOOD);
return ret;
}
/*
* PERSISTENT_RESERVE_IN Service Action READ_KEYS
*
* See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
*/
static int core_scsi3_pri_read_keys(struct se_cmd *cmd)
{
struct se_device *se_dev = cmd->se_dev;
struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
struct t10_pr_registration *pr_reg;
unsigned char *buf;
u32 add_len = 0, off = 8;
if (cmd->data_length < 8) {
pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
" too small\n", cmd->data_length);
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
return -EINVAL;
}
buf = transport_kmap_data_sg(cmd);
buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
spin_lock(&su_dev->t10_pr.registration_lock);
list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list,
pr_reg_list) {
/*
* Check for overflow of 8byte PRI READ_KEYS payload and
* next reservation key list descriptor.
*/
if ((add_len + 8) > (cmd->data_length - 8))
break;
buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
buf[off++] = (pr_reg->pr_res_key & 0xff);
add_len += 8;
}
spin_unlock(&su_dev->t10_pr.registration_lock);
buf[4] = ((add_len >> 24) & 0xff);
buf[5] = ((add_len >> 16) & 0xff);
buf[6] = ((add_len >> 8) & 0xff);
buf[7] = (add_len & 0xff);
transport_kunmap_data_sg(cmd);
return 0;
}
/*
* PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
*
* See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
*/
static int core_scsi3_pri_read_reservation(struct se_cmd *cmd)
{
struct se_device *se_dev = cmd->se_dev;
struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
struct t10_pr_registration *pr_reg;
unsigned char *buf;
u64 pr_res_key;
u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
if (cmd->data_length < 8) {
pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
" too small\n", cmd->data_length);
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
return -EINVAL;
}
buf = transport_kmap_data_sg(cmd);
buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
spin_lock(&se_dev->dev_reservation_lock);
pr_reg = se_dev->dev_pr_res_holder;
if (pr_reg) {
/*
* Set the hardcoded Additional Length
*/
buf[4] = ((add_len >> 24) & 0xff);
buf[5] = ((add_len >> 16) & 0xff);
buf[6] = ((add_len >> 8) & 0xff);
buf[7] = (add_len & 0xff);
if (cmd->data_length < 22)
goto err;
/*
* Set the Reservation key.
*
* From spc4r17, section 5.7.10:
* A persistent reservation holder has its reservation key
* returned in the parameter data from a PERSISTENT
* RESERVE IN command with READ RESERVATION service action as
* follows:
* a) For a persistent reservation of the type Write Exclusive
* - All Registrants or Exclusive Access ­ All Regitrants,
* the reservation key shall be set to zero; or
* b) For all other persistent reservation types, the
* reservation key shall be set to the registered
* reservation key for the I_T nexus that holds the
* persistent reservation.
*/
if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
(pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
pr_res_key = 0;
else
pr_res_key = pr_reg->pr_res_key;
buf[8] = ((pr_res_key >> 56) & 0xff);
buf[9] = ((pr_res_key >> 48) & 0xff);
buf[10] = ((pr_res_key >> 40) & 0xff);
buf[11] = ((pr_res_key >> 32) & 0xff);
buf[12] = ((pr_res_key >> 24) & 0xff);
buf[13] = ((pr_res_key >> 16) & 0xff);
buf[14] = ((pr_res_key >> 8) & 0xff);
buf[15] = (pr_res_key & 0xff);
/*
* Set the SCOPE and TYPE
*/
buf[21] = (pr_reg->pr_res_scope & 0xf0) |
(pr_reg->pr_res_type & 0x0f);
}
err:
spin_unlock(&se_dev->dev_reservation_lock);
transport_kunmap_data_sg(cmd);
return 0;
}
/*
* PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
*
* See spc4r17 section 6.13.4 Table 165
*/
static int core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
unsigned char *buf;
u16 add_len = 8; /* Hardcoded to 8. */
if (cmd->data_length < 6) {
pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
" %u too small\n", cmd->data_length);
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
return -EINVAL;
}
buf = transport_kmap_data_sg(cmd);
buf[0] = ((add_len << 8) & 0xff);
buf[1] = (add_len & 0xff);
buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
/*
* We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
* set the TMV: Task Mask Valid bit.
*/
buf[3] |= 0x80;
/*
* Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
*/
buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
/*
* PTPL_A: Persistence across Target Power Loss Active bit
*/
if (pr_tmpl->pr_aptpl_active)
buf[3] |= 0x01;
/*
* Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
*/
buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
transport_kunmap_data_sg(cmd);
return 0;
}
/*
* PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
*
* See spc4r17 section 6.13.5 Table 168 and 169
*/
static int core_scsi3_pri_read_full_status(struct se_cmd *cmd)
{
struct se_device *se_dev = cmd->se_dev;
struct se_node_acl *se_nacl;
struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
struct se_portal_group *se_tpg;
struct t10_pr_registration *pr_reg, *pr_reg_tmp;
struct t10_reservation *pr_tmpl = &se_dev->se_sub_dev->t10_pr;
unsigned char *buf;
u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len;
u32 off = 8; /* off into first Full Status descriptor */
int format_code = 0;
if (cmd->data_length < 8) {
pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
" too small\n", cmd->data_length);
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
return -EINVAL;
}
buf = transport_kmap_data_sg(cmd);
buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
spin_lock(&pr_tmpl->registration_lock);
list_for_each_entry_safe(pr_reg, pr_reg_tmp,
&pr_tmpl->registration_list, pr_reg_list) {
se_nacl = pr_reg->pr_reg_nacl;
se_tpg = pr_reg->pr_reg_nacl->se_tpg;
add_desc_len = 0;
atomic_inc(&pr_reg->pr_res_holders);
smp_mb__after_atomic_inc();
spin_unlock(&pr_tmpl->registration_lock);
/*
* Determine expected length of $FABRIC_MOD specific
* TransportID full status descriptor..
*/
exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len(
se_tpg, se_nacl, pr_reg, &format_code);
if ((exp_desc_len + add_len) > cmd->data_length) {
pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
" out of buffer: %d\n", cmd->data_length);
spin_lock(&pr_tmpl->registration_lock);
atomic_dec(&pr_reg->pr_res_holders);
smp_mb__after_atomic_dec();
break;
}
/*
* Set RESERVATION KEY
*/
buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
buf[off++] = (pr_reg->pr_res_key & 0xff);
off += 4; /* Skip Over Reserved area */
/*
* Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
*/
if (pr_reg->pr_reg_all_tg_pt)
buf[off] = 0x02;
/*
* The struct se_lun pointer will be present for the
* reservation holder for PR_HOLDER bit.
*
* Also, if this registration is the reservation
* holder, fill in SCOPE and TYPE in the next byte.
*/
if (pr_reg->pr_res_holder) {
buf[off++] |= 0x01;
buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
(pr_reg->pr_res_type & 0x0f);
} else
off += 2;
off += 4; /* Skip over reserved area */
/*
* From spc4r17 6.3.15:
*
* If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
* IDENTIFIER field contains the relative port identifier (see
* 3.1.120) of the target port that is part of the I_T nexus
* described by this full status descriptor. If the ALL_TG_PT
* bit is set to one, the contents of the RELATIVE TARGET PORT
* IDENTIFIER field are not defined by this standard.
*/
if (!pr_reg->pr_reg_all_tg_pt) {
struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep;
buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
buf[off++] = (port->sep_rtpi & 0xff);
} else
off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
/*
* Now, have the $FABRIC_MOD fill in the protocol identifier
*/
desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg,
se_nacl, pr_reg, &format_code, &buf[off+4]);
spin_lock(&pr_tmpl->registration_lock);
atomic_dec(&pr_reg->pr_res_holders);
smp_mb__after_atomic_dec();
/*
* Set the ADDITIONAL DESCRIPTOR LENGTH
*/
buf[off++] = ((desc_len >> 24) & 0xff);
buf[off++] = ((desc_len >> 16) & 0xff);
buf[off++] = ((desc_len >> 8) & 0xff);
buf[off++] = (desc_len & 0xff);
/*
* Size of full desctipor header minus TransportID
* containing $FABRIC_MOD specific) initiator device/port
* WWN information.
*
* See spc4r17 Section 6.13.5 Table 169
*/
add_desc_len = (24 + desc_len);
off += desc_len;
add_len += add_desc_len;
}
spin_unlock(&pr_tmpl->registration_lock);
/*
* Set ADDITIONAL_LENGTH
*/
buf[4] = ((add_len >> 24) & 0xff);
buf[5] = ((add_len >> 16) & 0xff);
buf[6] = ((add_len >> 8) & 0xff);
buf[7] = (add_len & 0xff);
transport_kunmap_data_sg(cmd);
return 0;
}
int target_scsi3_emulate_pr_in(struct se_cmd *cmd)
{
int ret;
/*
* Following spc2r20 5.5.1 Reservations overview:
*
* If a logical unit has been reserved by any RESERVE command and is
* still reserved by any initiator, all PERSISTENT RESERVE IN and all
* PERSISTENT RESERVE OUT commands shall conflict regardless of
* initiator or service action and shall terminate with a RESERVATION
* CONFLICT status.
*/
if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) {
pr_err("Received PERSISTENT_RESERVE CDB while legacy"
" SPC-2 reservation is held, returning"
" RESERVATION_CONFLICT\n");
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EINVAL;
}
switch (cmd->t_task_cdb[1] & 0x1f) {
case PRI_READ_KEYS:
ret = core_scsi3_pri_read_keys(cmd);
break;
case PRI_READ_RESERVATION:
ret = core_scsi3_pri_read_reservation(cmd);
break;
case PRI_REPORT_CAPABILITIES:
ret = core_scsi3_pri_report_capabilities(cmd);
break;
case PRI_READ_FULL_STATUS:
ret = core_scsi3_pri_read_full_status(cmd);
break;
default:
pr_err("Unknown PERSISTENT_RESERVE_IN service"
" action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
ret = -EINVAL;
break;
}
if (!ret)
target_complete_cmd(cmd, GOOD);
return ret;
}
static int core_pt_reservation_check(struct se_cmd *cmd, u32 *pr_res_type)
{
return 0;
}
static int core_pt_seq_non_holder(
struct se_cmd *cmd,
unsigned char *cdb,
u32 pr_reg_type)
{
return 0;
}
int core_setup_reservations(struct se_device *dev, int force_pt)
{
struct se_subsystem_dev *su_dev = dev->se_sub_dev;
struct t10_reservation *rest = &su_dev->t10_pr;
/*
* If this device is from Target_Core_Mod/pSCSI, use the reservations
* of the Underlying SCSI hardware. In Linux/SCSI terms, this can
* cause a problem because libata and some SATA RAID HBAs appear
* under Linux/SCSI, but to emulate reservations themselves.
*/
if (((dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) &&
!(dev->se_sub_dev->se_dev_attrib.emulate_reservations)) || force_pt) {
rest->res_type = SPC_PASSTHROUGH;
rest->pr_ops.t10_reservation_check = &core_pt_reservation_check;
rest->pr_ops.t10_seq_non_holder = &core_pt_seq_non_holder;
pr_debug("%s: Using SPC_PASSTHROUGH, no reservation"
" emulation\n", dev->transport->name);
return 0;
}
/*
* If SPC-3 or above is reported by real or emulated struct se_device,
* use emulated Persistent Reservations.
*/
if (dev->transport->get_device_rev(dev) >= SCSI_3) {
rest->res_type = SPC3_PERSISTENT_RESERVATIONS;
rest->pr_ops.t10_reservation_check = &core_scsi3_pr_reservation_check;
rest->pr_ops.t10_seq_non_holder = &core_scsi3_pr_seq_non_holder;
pr_debug("%s: Using SPC3_PERSISTENT_RESERVATIONS"
" emulation\n", dev->transport->name);
} else {
rest->res_type = SPC2_RESERVATIONS;
rest->pr_ops.t10_reservation_check = &core_scsi2_reservation_check;
rest->pr_ops.t10_seq_non_holder =
&core_scsi2_reservation_seq_non_holder;
pr_debug("%s: Using SPC2_RESERVATIONS emulation\n",
dev->transport->name);
}
return 0;
}
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