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linux/drivers/target/target_core_pr.c
Martin K. Petersen 7907ad748b Merge patch series "Use block pr_ops in LIO" 
Mike Christie <michael.christie@oracle.com> says:

The patches in this thread allow us to use the block pr_ops with LIO's
target_core_iblock module to support cluster applications in VMs. They
were built over Linus's tree. They also apply over linux-next and
Martin's tree and Jens's trees.

Currently, to use windows clustering or linux clustering (pacemaker +
cluster labs scsi fence agents) in VMs with LIO and vhost-scsi, you
have to use tcmu or pscsi or use a cluster aware FS/framework for the
LIO pr file. Setting up a cluster FS/framework is pain and waste when
your real backend device is already a distributed device, and pscsi
and tcmu are nice for specific use cases, but iblock gives you the
best performance and allows you to use stacked devices like
dm-multipath. So these patches allow iblock to work like pscsi/tcmu
where they can pass a PR command to the backend module. And then
iblock will use the pr_ops to pass the PR command to the real devices
similar to what we do for unmap today.

The patches are separated in the following groups:

Patch 1 - 2:

 - Add block layer callouts for reading reservations and rename reservation
   error code.

Patch 3 - 5:

 - SCSI support for new callouts.

Patch 6:

 - DM support for new callouts.

Patch 7 - 13:

 - NVMe support for new callouts.

Patch 14 - 18:

 - LIO support for new callouts.

This patchset has been tested with the libiscsi PGR ops and with
window's failover cluster verification test. Note that for scsi
backend devices we need this patchset:

https://lore.kernel.org/linux-scsi/20230123221046.125483-1-michael.christie@oracle.com/T/#m4834a643ffb5bac2529d65d40906d3cfbdd9b1b7

to handle UAs. To reduce the size of this patchset that's being done
separately to make reviewing easier. And to make merging easier this
patchset and the one above do not have any conflicts so can be merged
in different trees.

Link: https://lore.kernel.org/r/20230407200551.12660-1-michael.christie@oracle.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2023-05-22 16:35:02 -04:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*******************************************************************************
* Filename: target_core_pr.c
*
* This file contains SPC-3 compliant persistent reservations and
* legacy SPC-2 reservations with compatible reservation handling (CRH=1)
*
* (c) Copyright 2009-2013 Datera, Inc.
*
* Nicholas A. Bellinger <nab@kernel.org>
*
******************************************************************************/
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/vmalloc.h>
#include <linux/file.h>
#include <linux/fcntl.h>
#include <linux/fs.h>
#include <scsi/scsi_proto.h>
#include <asm/unaligned.h>
#include <target/target_core_base.h>
#include <target/target_core_backend.h>
#include <target/target_core_fabric.h>
#include "target_core_internal.h"
#include "target_core_pr.h"
#include "target_core_ua.h"
/*
* Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)
*/
struct pr_transport_id_holder {
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;
};
void core_pr_dump_initiator_port(
struct t10_pr_registration *pr_reg,
char *buf,
u32 size)
{
if (!pr_reg->isid_present_at_reg) {
buf[0] = '\0';
return;
}
snprintf(buf, size, ",i,0x%s", pr_reg->pr_reg_isid);
}
enum register_type {
REGISTER,
REGISTER_AND_IGNORE_EXISTING_KEY,
REGISTER_AND_MOVE,
};
enum preempt_type {
PREEMPT,
PREEMPT_AND_ABORT,
};
static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
struct t10_pr_registration *, int, int);
static int is_reservation_holder(
struct t10_pr_registration *pr_res_holder,
struct t10_pr_registration *pr_reg)
{
int pr_res_type;
if (pr_res_holder) {
pr_res_type = pr_res_holder->pr_res_type;
return pr_res_holder == pr_reg ||
pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG;
}
return 0;
}
static sense_reason_t
target_scsi2_reservation_check(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
struct se_session *sess = cmd->se_sess;
switch (cmd->t_task_cdb[0]) {
case INQUIRY:
case RELEASE:
case RELEASE_10:
return 0;
default:
break;
}
if (!dev->reservation_holder || !sess)
return 0;
if (dev->reservation_holder->se_node_acl != sess->se_node_acl)
return TCM_RESERVATION_CONFLICT;
if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
if (dev->dev_res_bin_isid != sess->sess_bin_isid)
return TCM_RESERVATION_CONFLICT;
}
return 0;
}
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_device *dev = cmd->se_dev;
struct t10_pr_registration *pr_reg;
struct t10_reservation *pr_tmpl = &dev->t10_pr;
int conflict = 0;
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");
return -EBUSY;
}
return 0;
}
void target_release_reservation(struct se_device *dev)
{
dev->reservation_holder = NULL;
dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS;
if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {
dev->dev_res_bin_isid = 0;
dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS_WITH_ISID;
}
}
sense_reason_t
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 rc;
if (!sess || !sess->se_tpg)
goto out;
rc = target_check_scsi2_reservation_conflict(cmd);
if (rc == 1)
goto out;
if (rc < 0)
return TCM_RESERVATION_CONFLICT;
spin_lock(&dev->dev_reservation_lock);
if (!dev->reservation_holder || !sess)
goto out_unlock;
if (dev->reservation_holder->se_node_acl != sess->se_node_acl)
goto out_unlock;
if (dev->dev_res_bin_isid != sess->sess_bin_isid)
goto out_unlock;
target_release_reservation(dev);
tpg = sess->se_tpg;
pr_debug("SCSI-2 Released reservation for %s LUN: %llu ->"
" MAPPED LUN: %llu for %s\n",
tpg->se_tpg_tfo->fabric_name,
cmd->se_lun->unpacked_lun, cmd->orig_fe_lun,
sess->se_node_acl->initiatorname);
out_unlock:
spin_unlock(&dev->dev_reservation_lock);
out:
target_complete_cmd(cmd, SAM_STAT_GOOD);
return 0;
}
sense_reason_t
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;
sense_reason_t ret = 0;
int rc;
if ((cmd->t_task_cdb[1] & 0x01) &&
(cmd->t_task_cdb[1] & 0x02)) {
pr_err("LongIO and Obsolete Bits set, returning ILLEGAL_REQUEST\n");
return TCM_UNSUPPORTED_SCSI_OPCODE;
}
/*
* 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;
if (rc < 0)
return TCM_RESERVATION_CONFLICT;
tpg = sess->se_tpg;
spin_lock(&dev->dev_reservation_lock);
if (dev->reservation_holder &&
dev->reservation_holder->se_node_acl != sess->se_node_acl) {
pr_err("SCSI-2 RESERVATION CONFLICT for %s fabric\n",
tpg->se_tpg_tfo->fabric_name);
pr_err("Original reserver LUN: %llu %s\n",
cmd->se_lun->unpacked_lun,
dev->reservation_holder->se_node_acl->initiatorname);
pr_err("Current attempt - LUN: %llu -> MAPPED LUN: %llu"
" from %s \n", cmd->se_lun->unpacked_lun,
cmd->orig_fe_lun,
sess->se_node_acl->initiatorname);
ret = TCM_RESERVATION_CONFLICT;
goto out_unlock;
}
dev->reservation_holder = sess;
dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS;
if (sess->sess_bin_isid != 0) {
dev->dev_res_bin_isid = sess->sess_bin_isid;
dev->dev_reservation_flags |= DRF_SPC2_RESERVATIONS_WITH_ISID;
}
pr_debug("SCSI-2 Reserved %s LUN: %llu -> MAPPED LUN: %llu"
" for %s\n", tpg->se_tpg_tfo->fabric_name,
cmd->se_lun->unpacked_lun, cmd->orig_fe_lun,
sess->se_node_acl->initiatorname);
out_unlock:
spin_unlock(&dev->dev_reservation_lock);
out:
if (!ret)
target_complete_cmd(cmd, SAM_STAT_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, u32 pr_reg_type,
bool isid_mismatch)
{
unsigned char *cdb = cmd->t_task_cdb;
struct se_session *se_sess = cmd->se_sess;
struct se_node_acl *nacl = se_sess->se_node_acl;
int other_cdb = 0;
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 */
if (isid_mismatch) {
registered_nexus = 0;
} else {
struct se_dev_entry *se_deve;
rcu_read_lock();
se_deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun);
if (se_deve)
registered_nexus = test_bit(DEF_PR_REG_ACTIVE,
&se_deve->deve_flags);
rcu_read_unlock();
}
switch (pr_reg_type) {
case PR_TYPE_WRITE_EXCLUSIVE:
we = 1;
fallthrough;
case PR_TYPE_EXCLUSIVE_ACCESS:
/*
* Some commands are only allowed for the persistent reservation
* holder.
*/
break;
case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
we = 1;
fallthrough;
case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
/*
* Some commands are only allowed for registered I_T Nexuses.
*/
reg_only = 1;
break;
case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
we = 1;
fallthrough;
case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
/*
* Each registered I_T Nexus is a reservation holder.
*/
all_reg = 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 SERVICE_ACTION_IN_12:
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 explicit 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 implicit 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 implicit CDB: 0x%02x for %s"
" reservation\n", cdb[0],
core_scsi3_pr_dump_type(pr_reg_type));
return 0;
}
} else if (we && registered_nexus) {
/*
* Reads are allowed for Write Exclusive locks
* from all registrants.
*/
if (cmd->data_direction == DMA_FROM_DEVICE) {
pr_debug("Allowing READ 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 sense_reason_t
target_scsi3_pr_reservation_check(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
struct se_session *sess = cmd->se_sess;
u32 pr_reg_type;
bool isid_mismatch = false;
if (!dev->dev_pr_res_holder)
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)
goto check_nonholder;
if (dev->dev_pr_res_holder->isid_present_at_reg) {
if (dev->dev_pr_res_holder->pr_reg_bin_isid !=
sess->sess_bin_isid) {
isid_mismatch = true;
goto check_nonholder;
}
}
return 0;
check_nonholder:
if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type, isid_mismatch))
return TCM_RESERVATION_CONFLICT;
return 0;
}
static u32 core_scsi3_pr_generation(struct se_device *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 = dev->t10_pr.pr_generation++;
spin_unlock(&dev->dev_reservation_lock);
return prg;
}
static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
struct se_device *dev,
struct se_node_acl *nacl,
struct se_lun *lun,
struct se_dev_entry *dest_deve,
u64 mapped_lun,
unsigned char *isid,
u64 sa_res_key,
int all_tg_pt,
int aptpl)
{
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;
}
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;
/*
* For destination registrations for ALL_TG_PT=1 and SPEC_I_PT=1,
* the se_dev_entry->pr_ref will have been already obtained by
* core_get_se_deve_from_rtpi() or __core_scsi3_alloc_registration().
*
* Otherwise, locate se_dev_entry now and obtain a reference until
* registration completes in __core_scsi3_add_registration().
*/
if (dest_deve) {
pr_reg->pr_reg_deve = dest_deve;
} else {
rcu_read_lock();
pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun);
if (!pr_reg->pr_reg_deve) {
rcu_read_unlock();
pr_err("Unable to locate PR deve %s mapped_lun: %llu\n",
nacl->initiatorname, mapped_lun);
kmem_cache_free(t10_pr_reg_cache, pr_reg);
return NULL;
}
kref_get(&pr_reg->pr_reg_deve->pr_kref);
rcu_read_unlock();
}
pr_reg->pr_res_mapped_lun = mapped_lun;
pr_reg->pr_aptpl_target_lun = lun->unpacked_lun;
pr_reg->tg_pt_sep_rtpi = lun->lun_tpg->tpg_rtpi;
pr_reg->pr_res_key = sa_res_key;
pr_reg->pr_reg_all_tg_pt = all_tg_pt;
pr_reg->pr_reg_aptpl = aptpl;
/*
* 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_lun *lun,
struct se_dev_entry *deve,
u64 mapped_lun,
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_lun_acl *lacl_tmp;
struct se_lun *lun_tmp, *next, *dest_lun;
const 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, lun, deve, mapped_lun,
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(lun_tmp, next, &dev->dev_sep_list, lun_dev_link) {
if (!percpu_ref_tryget_live(&lun_tmp->lun_ref))
continue;
spin_unlock(&dev->se_port_lock);
spin_lock(&lun_tmp->lun_deve_lock);
list_for_each_entry(deve_tmp, &lun_tmp->lun_deve_list, lun_link) {
/*
* This pointer will be NULL for demo mode MappedLUNs
* that have not been make explicit via a ConfigFS
* MappedLUN group for the SCSI Initiator Node ACL.
*/
if (!deve_tmp->se_lun_acl)
continue;
lacl_tmp = deve_tmp->se_lun_acl;
nacl_tmp = lacl_tmp->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;
kref_get(&deve_tmp->pr_kref);
spin_unlock(&lun_tmp->lun_deve_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");
percpu_ref_put(&lun_tmp->lun_ref);
kref_put(&deve_tmp->pr_kref, target_pr_kref_release);
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()
*/
dest_lun = deve_tmp->se_lun;
pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
nacl_tmp, dest_lun, deve_tmp,
deve_tmp->mapped_lun, NULL,
sa_res_key, all_tg_pt, aptpl);
if (!pr_reg_atp) {
percpu_ref_put(&lun_tmp->lun_ref);
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(&lun_tmp->lun_deve_lock);
}
spin_unlock(&lun_tmp->lun_deve_lock);
spin_lock(&dev->se_port_lock);
percpu_ref_put(&lun_tmp->lun_ref);
}
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,
u64 mapped_lun,
unsigned char *t_port,
u16 tpgt,
u64 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;
}
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_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] = { };
core_pr_dump_initiator_port(pr_reg, i_buf, 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->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->fabric_name, node_acl->initiatorname,
i_buf);
}
static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
struct t10_pr_registration *, enum register_type, int);
static int __core_scsi3_check_aptpl_registration(
struct se_device *dev,
struct se_portal_group *tpg,
struct se_lun *lun,
u64 target_lun,
struct se_node_acl *nacl,
u64 mapped_lun)
{
struct t10_pr_registration *pr_reg, *pr_reg_tmp;
struct t10_reservation *pr_tmpl = &dev->t10_pr;
unsigned char i_port[PR_APTPL_MAX_IPORT_LEN] = { };
unsigned char t_port[PR_APTPL_MAX_TPORT_LEN] = { };
u16 tpgt;
/*
* 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 == mapped_lun) &&
!(strcmp(pr_reg->pr_tport, t_port)) &&
(pr_reg->pr_reg_tpgt == tpgt) &&
(pr_reg->pr_aptpl_target_lun == target_lun)) {
/*
* Obtain the ->pr_reg_deve pointer + reference, that
* is released by __core_scsi3_add_registration() below.
*/
rcu_read_lock();
pr_reg->pr_reg_deve = target_nacl_find_deve(nacl, mapped_lun);
if (!pr_reg->pr_reg_deve) {
pr_err("Unable to locate PR APTPL %s mapped_lun:"
" %llu\n", nacl->initiatorname, mapped_lun);
rcu_read_unlock();
continue;
}
kref_get(&pr_reg->pr_reg_deve->pr_kref);
rcu_read_unlock();
pr_reg->pr_reg_nacl = nacl;
pr_reg->tg_pt_sep_rtpi = lun->lun_tpg->tpg_rtpi;
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_node_acl *nacl,
u64 mapped_lun)
{
if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
return 0;
return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
lun->unpacked_lun, nacl,
mapped_lun);
}
static void __core_scsi3_dump_registration(
const struct target_core_fabric_ops *tfo,
struct se_device *dev,
struct se_node_acl *nacl,
struct t10_pr_registration *pr_reg,
enum register_type register_type)
{
struct se_portal_group *se_tpg = nacl->se_tpg;
char i_buf[PR_REG_ISID_ID_LEN] = { };
core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
" Node: %s%s\n", tfo->fabric_name, (register_type == REGISTER_AND_MOVE) ?
"_AND_MOVE" : (register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ?
"_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
i_buf);
pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
tfo->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->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->fabric_name,
pr_reg->pr_res_key, pr_reg->pr_res_generation,
pr_reg->pr_reg_aptpl);
}
static void __core_scsi3_add_registration(
struct se_device *dev,
struct se_node_acl *nacl,
struct t10_pr_registration *pr_reg,
enum register_type register_type,
int register_move)
{
const 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->t10_pr;
struct se_dev_entry *deve;
/*
* 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) ?
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);
__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)
goto out;
/*
* 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) {
struct se_node_acl *nacl_tmp = pr_reg_tmp->pr_reg_nacl;
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);
__core_scsi3_dump_registration(tfo, dev, nacl_tmp, pr_reg_tmp,
register_type);
spin_unlock(&pr_tmpl->registration_lock);
/*
* Drop configfs group dependency reference and deve->pr_kref
* obtained from __core_scsi3_alloc_registration() code.
*/
rcu_read_lock();
deve = pr_reg_tmp->pr_reg_deve;
if (deve) {
set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
core_scsi3_lunacl_undepend_item(deve);
pr_reg_tmp->pr_reg_deve = NULL;
}
rcu_read_unlock();
}
out:
/*
* Drop deve->pr_kref obtained in __core_scsi3_do_alloc_registration()
*/
rcu_read_lock();
deve = pr_reg->pr_reg_deve;
if (deve) {
set_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
kref_put(&deve->pr_kref, target_pr_kref_release);
pr_reg->pr_reg_deve = NULL;
}
rcu_read_unlock();
}
static int core_scsi3_alloc_registration(
struct se_device *dev,
struct se_node_acl *nacl,
struct se_lun *lun,
struct se_dev_entry *deve,
u64 mapped_lun,
unsigned char *isid,
u64 sa_res_key,
int all_tg_pt,
int aptpl,
enum register_type register_type,
int register_move)
{
struct t10_pr_registration *pr_reg;
pr_reg = __core_scsi3_alloc_registration(dev, nacl, lun, deve, mapped_lun,
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->t10_pr;
struct t10_pr_registration *pr_reg, *pr_reg_tmp;
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;
/*
* If this registration does NOT contain a fabric provided
* ISID, then we have found a match.
*/
if (!pr_reg->isid_present_at_reg) {
atomic_inc_mb(&pr_reg->pr_res_holders);
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_mb(&pr_reg->pr_res_holders);
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] = { };
unsigned char *isid_ptr = NULL;
if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
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_mb(&pr_reg->pr_res_holders);
}
static int core_scsi3_check_implicit_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 implicit 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, 1);
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 implicitly 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;
}
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)
__releases(&pr_tmpl->registration_lock)
__acquires(&pr_tmpl->registration_lock)
{
const struct target_core_fabric_ops *tfo =
pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
struct t10_reservation *pr_tmpl = &dev->t10_pr;
struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
struct se_dev_entry *deve;
char i_buf[PR_REG_ISID_ID_LEN] = { };
lockdep_assert_held(&pr_tmpl->registration_lock);
core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
if (!list_empty(&pr_reg->pr_reg_list))
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);
spin_unlock(&pr_tmpl->registration_lock);
/*
* 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) {
pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
tfo->fabric_name);
cpu_relax();
}
rcu_read_lock();
deve = target_nacl_find_deve(nacl, pr_reg->pr_res_mapped_lun);
if (deve)
clear_bit(DEF_PR_REG_ACTIVE, &deve->deve_flags);
rcu_read_unlock();
spin_lock(&pr_tmpl->registration_lock);
pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
" Node: %s%s\n", tfo->fabric_name,
pr_reg->pr_reg_nacl->initiatorname,
i_buf);
pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
" Port(s)\n", tfo->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->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;
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->t10_pr;
struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
bool free_reg = false;
/*
* 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, 1);
free_reg = true;
}
spin_unlock(&dev->dev_reservation_lock);
/*
* Release any registration associated with the struct se_node_acl.
*/
spin_lock(&pr_tmpl->registration_lock);
if (pr_res_holder && free_reg)
__core_scsi3_free_registration(dev, pr_res_holder, NULL, 0);
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->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, 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);
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 target_depend_item(&tpg->tpg_group.cg_item);
}
static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
{
target_undepend_item(&tpg->tpg_group.cg_item);
atomic_dec_mb(&tpg->tpg_pr_ref_count);
}
static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
{
if (nacl->dynamic_node_acl)
return 0;
return target_depend_item(&nacl->acl_group.cg_item);
}
static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
{
if (!nacl->dynamic_node_acl)
target_undepend_item(&nacl->acl_group.cg_item);
atomic_dec_mb(&nacl->acl_pr_ref_count);
}
static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
{
/*
* For nacl->dynamic_node_acl=1
*/
if (!se_deve->se_lun_acl)
return 0;
return target_depend_item(&se_deve->se_lun_acl->se_lun_group.cg_item);
}
static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
{
/*
* For nacl->dynamic_node_acl=1
*/
if (!se_deve->se_lun_acl) {
kref_put(&se_deve->pr_kref, target_pr_kref_release);
return;
}
target_undepend_item(&se_deve->se_lun_acl->se_lun_group.cg_item);
kref_put(&se_deve->pr_kref, target_pr_kref_release);
}
static sense_reason_t
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_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;
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;
unsigned char *buf, *ptr, proto_ident;
const unsigned char *i_str = NULL;
char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN];
sense_reason_t ret;
u32 tpdl, tid_len = 0;
u32 dest_rtpi = 0;
/*
* Allocate a struct pr_transport_id_holder and setup the
* local_node_acl pointer 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");
return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
}
INIT_LIST_HEAD(&tidh_new->dest_list);
tidh_new->dest_tpg = tpg;
tidh_new->dest_node_acl = se_sess->se_node_acl;
local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
se_sess->se_node_acl, cmd->se_lun,
NULL, cmd->orig_fe_lun, l_isid,
sa_res_key, all_tg_pt, aptpl);
if (!local_pr_reg) {
kfree(tidh_new);
return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
}
if (core_scsi3_lunacl_depend_item(local_pr_reg->pr_reg_deve)) {
kfree(tidh_new);
kref_put(&local_pr_reg->pr_reg_deve->pr_kref,
target_pr_kref_release);
kmem_cache_free(t10_pr_reg_cache, local_pr_reg);
return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
}
tidh_new->dest_pr_reg = local_pr_reg;
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);
ret = TCM_INVALID_PARAMETER_LIST;
goto out;
}
buf = transport_kmap_data_sg(cmd);
if (!buf) {
ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
goto out;
}
/*
* 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 = get_unaligned_be32(&buf[24]);
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);
ret = TCM_INVALID_PARAMETER_LIST;
goto out_unmap;
}
/*
* 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) {
struct se_lun *dest_lun, *tmp_lun;
proto_ident = (ptr[0] & 0x0f);
dest_tpg = NULL;
spin_lock(&dev->se_port_lock);
list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) {
tmp_tpg = tmp_lun->lun_tpg;
/*
* Look for the matching proto_ident provided by
* the received TransportID
*/
if (tmp_tpg->proto_id != proto_ident)
continue;
dest_rtpi = tmp_lun->lun_tpg->tpg_rtpi;
iport_ptr = NULL;
i_str = target_parse_pr_out_transport_id(tmp_tpg,
ptr, &tid_len, &iport_ptr);
if (!i_str)
continue;
/*
* 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 &&
dev->dev_attrib.enforce_pr_isids &&
!iport_ptr) {
pr_warn("SPC-PR: enforce_pr_isids is set but a isid has not been sent in the SPEC_I_PT data for %s.",
i_str);
ret = TCM_INVALID_PARAMETER_LIST;
spin_unlock(&dev->se_port_lock);
goto out_unmap;
}
atomic_inc_mb(&tmp_tpg->tpg_pr_ref_count);
spin_unlock(&dev->se_port_lock);
if (core_scsi3_tpg_depend_item(tmp_tpg)) {
pr_err(" core_scsi3_tpg_depend_item()"
" for tmp_tpg\n");
atomic_dec_mb(&tmp_tpg->tpg_pr_ref_count);
ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
goto out_unmap;
}
/*
* Locate the destination initiator ACL to be registered
* from the decoded fabric module specific TransportID
* at *i_str.
*/
mutex_lock(&tmp_tpg->acl_node_mutex);
dest_node_acl = __core_tpg_get_initiator_node_acl(
tmp_tpg, i_str);
if (dest_node_acl)
atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
mutex_unlock(&tmp_tpg->acl_node_mutex);
if (!dest_node_acl) {
core_scsi3_tpg_undepend_item(tmp_tpg);
spin_lock(&dev->se_port_lock);
continue;
}
if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
pr_err("configfs_depend_item() failed"
" for dest_node_acl->acl_group\n");
atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
core_scsi3_tpg_undepend_item(tmp_tpg);
ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
goto out_unmap;
}
dest_tpg = tmp_tpg;
pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s Port RTPI: %u\n",
dest_tpg->se_tpg_tfo->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");
ret = TCM_INVALID_PARAMETER_LIST;
goto out_unmap;
}
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->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);
ret = TCM_INVALID_PARAMETER_LIST;
goto out_unmap;
}
/*
* 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: %u\n",
dest_tpg->se_tpg_tfo->fabric_name,
dest_rtpi);
core_scsi3_nodeacl_undepend_item(dest_node_acl);
core_scsi3_tpg_undepend_item(dest_tpg);
ret = TCM_INVALID_PARAMETER_LIST;
goto out_unmap;
}
if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
pr_err("core_scsi3_lunacl_depend_item()"
" failed\n");
kref_put(&dest_se_deve->pr_kref, target_pr_kref_release);
core_scsi3_nodeacl_undepend_item(dest_node_acl);
core_scsi3_tpg_undepend_item(dest_tpg);
ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
goto out_unmap;
}
pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
" dest_se_deve mapped_lun: %llu\n",
dest_tpg->se_tpg_tfo->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);
ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
goto out_unmap;
}
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_lun = dest_se_deve->se_lun;
dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
dest_node_acl, dest_lun, dest_se_deve,
dest_se_deve->mapped_lun, 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);
ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
goto out_unmap;
}
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;
list_del(&tidh->dest_list);
kfree(tidh);
memset(i_buf, 0, PR_REG_ISID_ID_LEN);
core_pr_dump_initiator_port(dest_pr_reg, i_buf, 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:"
" %llu\n", dest_tpg->se_tpg_tfo->fabric_name,
dest_node_acl->initiatorname, i_buf, (dest_se_deve) ?
dest_se_deve->mapped_lun : 0);
if (dest_pr_reg == local_pr_reg)
continue;
core_scsi3_nodeacl_undepend_item(dest_node_acl);
core_scsi3_tpg_undepend_item(dest_tpg);
}
return 0;
out_unmap:
transport_kunmap_data_sg(cmd);
out:
/*
* 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) {
bool is_local = false;
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;
if (dest_pr_reg == local_pr_reg)
is_local = true;
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);
}
kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
core_scsi3_lunacl_undepend_item(dest_se_deve);
if (is_local)
continue;
core_scsi3_nodeacl_undepend_item(dest_node_acl);
core_scsi3_tpg_undepend_item(dest_tpg);
}
return ret;
}
static int core_scsi3_update_aptpl_buf(
struct se_device *dev,
unsigned char *buf,
u32 pr_aptpl_buf_len)
{
struct se_portal_group *tpg;
struct t10_pr_registration *pr_reg;
unsigned char tmp[512], isid_buf[32];
ssize_t len = 0;
int reg_count = 0;
int ret = 0;
spin_lock(&dev->dev_reservation_lock);
spin_lock(&dev->t10_pr.registration_lock);
/*
* Walk the registration list..
*/
list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
pr_reg_list) {
tmp[0] = '\0';
isid_buf[0] = '\0';
tpg = pr_reg->pr_reg_nacl->se_tpg;
/*
* 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=%llu\n", reg_count,
tpg->se_tpg_tfo->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=%llu\n",
reg_count, tpg->se_tpg_tfo->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,"
" reallocating larger buffer\n");
ret = -EMSGSIZE;
goto out;
}
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=%llu\nPR_REG_END:"
" %d\n", tpg->se_tpg_tfo->fabric_name,
tpg->se_tpg_tfo->tpg_get_wwn(tpg),
tpg->se_tpg_tfo->tpg_get_tag(tpg),
pr_reg->tg_pt_sep_rtpi, pr_reg->pr_aptpl_target_lun,
reg_count);
if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
pr_err("Unable to update renaming APTPL metadata,"
" reallocating larger buffer\n");
ret = -EMSGSIZE;
goto out;
}
len += sprintf(buf+len, "%s", tmp);
reg_count++;
}
if (!reg_count)
len += sprintf(buf+len, "No Registrations or Reservations");
out:
spin_unlock(&dev->t10_pr.registration_lock);
spin_unlock(&dev->dev_reservation_lock);
return ret;
}
static int __core_scsi3_write_aptpl_to_file(
struct se_device *dev,
unsigned char *buf)
{
struct t10_wwn *wwn = &dev->t10_wwn;
struct file *file;
int flags = O_RDWR | O_CREAT | O_TRUNC;
char *path;
u32 pr_aptpl_buf_len;
int ret;
loff_t pos = 0;
path = kasprintf(GFP_KERNEL, "%s/pr/aptpl_%s", db_root,
&wwn->unit_serial[0]);
if (!path)
return -ENOMEM;
file = filp_open(path, flags, 0600);
if (IS_ERR(file)) {
pr_err("filp_open(%s) for APTPL metadata"
" failed\n", path);
kfree(path);
return PTR_ERR(file);
}
pr_aptpl_buf_len = (strlen(buf) + 1); /* Add extra for NULL */
ret = kernel_write(file, buf, pr_aptpl_buf_len, &pos);
if (ret < 0)
pr_debug("Error writing APTPL metadata file: %s\n", path);
fput(file);
kfree(path);
return (ret < 0) ? -EIO : 0;
}
/*
* Clear the APTPL metadata if APTPL has been disabled, otherwise
* write out the updated metadata to struct file for this SCSI device.
*/
static sense_reason_t core_scsi3_update_and_write_aptpl(struct se_device *dev, bool aptpl)
{
unsigned char *buf;
int rc, len = PR_APTPL_BUF_LEN;
if (!aptpl) {
char *null_buf = "No Registrations or Reservations\n";
rc = __core_scsi3_write_aptpl_to_file(dev, null_buf);
dev->t10_pr.pr_aptpl_active = 0;
pr_debug("SPC-3 PR: Set APTPL Bit Deactivated\n");
if (rc)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return 0;
}
retry:
buf = vzalloc(len);
if (!buf)
return TCM_OUT_OF_RESOURCES;
rc = core_scsi3_update_aptpl_buf(dev, buf, len);
if (rc < 0) {
vfree(buf);
len *= 2;
goto retry;
}
rc = __core_scsi3_write_aptpl_to_file(dev, buf);
if (rc != 0) {
pr_err("SPC-3 PR: Could not update APTPL\n");
vfree(buf);
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
}
dev->t10_pr.pr_aptpl_active = 1;
vfree(buf);
pr_debug("SPC-3 PR: Set APTPL Bit Activated\n");
return 0;
}
static sense_reason_t
core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,
bool aptpl, bool all_tg_pt, bool spec_i_pt, enum register_type register_type)
{
struct se_session *se_sess = cmd->se_sess;
struct se_device *dev = cmd->se_dev;
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;
struct t10_reservation *pr_tmpl = &dev->t10_pr;
unsigned char isid_buf[PR_REG_ISID_LEN] = { };
unsigned char *isid_ptr = NULL;
sense_reason_t ret = TCM_NO_SENSE;
int pr_holder = 0, type;
if (!se_sess || !se_lun) {
pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
}
se_tpg = se_sess->se_tpg;
if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
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 = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
if (!pr_reg) {
if (res_key) {
pr_warn("SPC-3 PR: Reservation Key non-zero"
" for SA REGISTER, returning CONFLICT\n");
return TCM_RESERVATION_CONFLICT;
}
/*
* 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.
*/
if (core_scsi3_alloc_registration(cmd->se_dev,
se_sess->se_node_acl, cmd->se_lun,
NULL, cmd->orig_fe_lun, isid_ptr,
sa_res_key, all_tg_pt, aptpl,
register_type, 0)) {
pr_err("Unable to allocate"
" struct t10_pr_registration\n");
return TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
}
} 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;
}
return core_scsi3_update_and_write_aptpl(dev, aptpl);
}
/* ok, existing registration */
if ((register_type == REGISTER) && (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);
ret = TCM_RESERVATION_CONFLICT;
goto out;
}
if (spec_i_pt) {
pr_err("SPC-3 PR REGISTER: SPEC_I_PT"
" set on a registered nexus\n");
ret = TCM_INVALID_PARAMETER_LIST;
goto out;
}
/*
* 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 REGISTER: ALL_TG_PT=1"
" registration exists, but ALL_TG_PT=1 bit not"
" present in received PROUT\n");
ret = TCM_INVALID_CDB_FIELD;
goto out;
}
/*
* sa_res_key=1 Change Reservation Key for registered I_T Nexus.
*/
if (sa_res_key) {
/*
* 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->fabric_name,
(register_type == REGISTER_AND_IGNORE_EXISTING_KEY) ? "_AND_IGNORE_EXISTING_KEY" : "",
pr_reg->pr_reg_nacl->initiatorname,
pr_reg->pr_res_key, pr_reg->pr_res_generation);
} else {
/*
* sa_res_key=0 Unregister Reservation Key for registered I_T Nexus.
*/
type = pr_reg->pr_res_type;
pr_holder = core_scsi3_check_implicit_release(cmd->se_dev,
pr_reg);
if (pr_holder < 0) {
ret = TCM_RESERVATION_CONFLICT;
goto out;
}
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);
pr_reg = NULL;
/*
* 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) {
target_ua_allocate_lun(
pr_reg_p->pr_reg_nacl,
pr_reg_p->pr_res_mapped_lun,
0x2A,
ASCQ_2AH_RESERVATIONS_RELEASED);
}
}
spin_unlock(&pr_tmpl->registration_lock);
}
ret = core_scsi3_update_and_write_aptpl(dev, aptpl);
out:
if (pr_reg)
core_scsi3_put_pr_reg(pr_reg);
return ret;
}
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 sense_reason_t
core_scsi3_pro_reserve(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_res_holder;
struct t10_reservation *pr_tmpl = &dev->t10_pr;
char i_buf[PR_REG_ISID_ID_LEN] = { };
sense_reason_t ret;
if (!se_sess || !se_lun) {
pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
}
/*
* 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");
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
}
/*
* 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);
ret = TCM_RESERVATION_CONFLICT;
goto out_put_pr_reg;
}
/*
* 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);
ret = TCM_INVALID_PARAMETER_LIST;
goto out_put_pr_reg;
}
/*
* 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 (!is_reservation_holder(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->fabric_name,
se_sess->se_node_acl->initiatorname,
pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name,
pr_res_holder->pr_reg_nacl->initiatorname);
spin_unlock(&dev->dev_reservation_lock);
ret = TCM_RESERVATION_CONFLICT;
goto out_put_pr_reg;
}
/*
* 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->fabric_name,
se_sess->se_node_acl->initiatorname,
pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name,
pr_res_holder->pr_reg_nacl->initiatorname);
spin_unlock(&dev->dev_reservation_lock);
ret = TCM_RESERVATION_CONFLICT;
goto out_put_pr_reg;
}
/*
* 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);
ret = 0;
goto out_put_pr_reg;
}
/*
* 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;
core_pr_dump_initiator_port(pr_reg, i_buf, 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->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->fabric_name,
se_sess->se_node_acl->initiatorname,
i_buf);
spin_unlock(&dev->dev_reservation_lock);
if (pr_tmpl->pr_aptpl_active)
core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
ret = 0;
out_put_pr_reg:
core_scsi3_put_pr_reg(pr_reg);
return ret;
}
static sense_reason_t
core_scsi3_emulate_pro_reserve(struct se_cmd *cmd, int type, int scope,
u64 res_key)
{
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:
return core_scsi3_pro_reserve(cmd, type, scope, res_key);
default:
pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
" 0x%02x\n", type);
return TCM_INVALID_CDB_FIELD;
}
}
static void __core_scsi3_complete_pro_release(
struct se_device *dev,
struct se_node_acl *se_nacl,
struct t10_pr_registration *pr_reg,
int explicit,
int unreg)
{
const struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
char i_buf[PR_REG_ISID_ID_LEN] = { };
int pr_res_type = 0, pr_res_scope = 0;
lockdep_assert_held(&dev->dev_reservation_lock);
core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
/*
* Go ahead and release the current PR reservation holder.
* If an All Registrants reservation is currently active and
* a unregister operation is requested, replace the current
* dev_pr_res_holder with another active registration.
*/
if (dev->dev_pr_res_holder) {
pr_res_type = dev->dev_pr_res_holder->pr_res_type;
pr_res_scope = dev->dev_pr_res_holder->pr_res_scope;
dev->dev_pr_res_holder->pr_res_type = 0;
dev->dev_pr_res_holder->pr_res_scope = 0;
dev->dev_pr_res_holder->pr_res_holder = 0;
dev->dev_pr_res_holder = NULL;
}
if (!unreg)
goto out;
spin_lock(&dev->t10_pr.registration_lock);
list_del_init(&pr_reg->pr_reg_list);
/*
* If the I_T nexus is a reservation holder, the persistent reservation
* is of an all registrants type, and the I_T nexus is the last remaining
* registered I_T nexus, then the device server shall also release the
* persistent reservation.
*/
if (!list_empty(&dev->t10_pr.registration_list) &&
((pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
(pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))) {
dev->dev_pr_res_holder =
list_entry(dev->t10_pr.registration_list.next,
struct t10_pr_registration, pr_reg_list);
dev->dev_pr_res_holder->pr_res_type = pr_res_type;
dev->dev_pr_res_holder->pr_res_scope = pr_res_scope;
dev->dev_pr_res_holder->pr_res_holder = 1;
}
spin_unlock(&dev->t10_pr.registration_lock);
out:
if (!dev->dev_pr_res_holder) {
pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
" reservation holder TYPE: %s ALL_TG_PT: %d\n",
tfo->fabric_name, (explicit) ? "explicit" :
"implicit", core_scsi3_pr_dump_type(pr_res_type),
(pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
}
pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
tfo->fabric_name, se_nacl->initiatorname,
i_buf);
/*
* 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 sense_reason_t
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->t10_pr;
sense_reason_t ret = 0;
if (!se_sess || !se_lun) {
pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
}
/*
* 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");
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
}
/*
* 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);
goto out_put_pr_reg;
}
if (!is_reservation_holder(pr_res_holder, pr_reg)) {
/*
* Release request from a registered I_T nexus that is not a
* persistent reservation holder. return GOOD status.
*/
spin_unlock(&dev->dev_reservation_lock);
goto out_put_pr_reg;
}
/*
* 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);
ret = TCM_RESERVATION_CONFLICT;
goto out_put_pr_reg;
}
/*
* 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->fabric_name,
se_sess->se_node_acl->initiatorname,
pr_res_nacl->se_tpg->se_tpg_tfo->fabric_name,
pr_res_holder->pr_reg_nacl->initiatorname);
spin_unlock(&dev->dev_reservation_lock);
ret = TCM_RESERVATION_CONFLICT;
goto out_put_pr_reg;
}
/*
* 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, 0);
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;
target_ua_allocate_lun(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)
core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
out_put_pr_reg:
core_scsi3_put_pr_reg(pr_reg);
return ret;
}
static sense_reason_t
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->t10_pr;
struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
u64 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");
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
}
/*
* 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);
return TCM_RESERVATION_CONFLICT;
}
/*
* 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, 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)
target_ua_allocate_lun(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->fabric_name);
core_scsi3_update_and_write_aptpl(cmd->se_dev, false);
core_scsi3_pr_generation(dev);
return 0;
}
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,
enum preempt_type preempt_type)
{
struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
const struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
char i_buf[PR_REG_ISID_ID_LEN] = { };
lockdep_assert_held(&dev->dev_reservation_lock);
core_pr_dump_initiator_port(pr_reg, i_buf, PR_REG_ISID_ID_LEN);
/*
* Do an implicit RELEASE of the existing reservation.
*/
if (dev->dev_pr_res_holder)
__core_scsi3_complete_pro_release(dev, nacl,
dev->dev_pr_res_holder, 0, 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->fabric_name, (preempt_type == PREEMPT_AND_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->fabric_name, (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "",
nacl->initiatorname, i_buf);
/*
* 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;
kmem_cache_free(t10_pr_reg_cache, pr_reg);
}
}
static sense_reason_t
core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key,
u64 sa_res_key, enum preempt_type preempt_type)
{
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->t10_pr;
u64 pr_res_mapped_lun = 0;
int all_reg = 0, calling_it_nexus = 0;
bool sa_res_key_unmatched = sa_res_key != 0;
int prh_type = 0, prh_scope = 0;
if (!se_sess)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
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",
(preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "");
return TCM_RESERVATION_CONFLICT;
}
if (pr_reg_n->pr_res_key != res_key) {
core_scsi3_put_pr_reg(pr_reg_n);
return TCM_RESERVATION_CONFLICT;
}
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);
return TCM_INVALID_PARAMETER_LIST;
}
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);
return TCM_INVALID_PARAMETER_LIST;
}
/*
* 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;
sa_res_key_unmatched = false;
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,
(preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
NULL, calling_it_nexus);
} 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 implicit
* 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;
sa_res_key_unmatched = false;
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,
(preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list :
NULL, 0);
}
if (!calling_it_nexus)
target_ua_allocate_lun(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 (sa_res_key_unmatched) {
spin_unlock(&dev->dev_reservation_lock);
core_scsi3_put_pr_reg(pr_reg_n);
return TCM_RESERVATION_CONFLICT;
}
/*
* 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,
(preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
type, scope, preempt_type);
}
spin_unlock(&dev->dev_reservation_lock);
/*
* SPC-4 5.12.11.2.6 Preempting and aborting
* The actions described in this subclause shall be performed
* for all I_T nexuses that are registered with the non-zero
* SERVICE ACTION RESERVATION KEY value, without regard for
* whether the preempted I_T nexuses hold the persistent
* reservation. If the SERVICE ACTION RESERVATION KEY field is
* set to zero and an all registrants persistent reservation is
* present, the device server shall abort all commands for all
* registered I_T nexuses.
*/
if (preempt_type == PREEMPT_AND_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)
core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
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, 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 (sa_res_key && 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,
(preempt_type == PREEMPT_AND_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;
*/
target_ua_allocate_lun(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,
(preempt_type == PREEMPT_AND_ABORT) ? &preempt_and_abort_list : NULL,
type, scope, preempt_type);
/*
* 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;
target_ua_allocate_lun(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 (preempt_type == PREEMPT_AND_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)
core_scsi3_update_and_write_aptpl(cmd->se_dev, true);
core_scsi3_put_pr_reg(pr_reg_n);
core_scsi3_pr_generation(cmd->se_dev);
return 0;
}
static sense_reason_t
core_scsi3_emulate_pro_preempt(struct se_cmd *cmd, int type, int scope,
u64 res_key, u64 sa_res_key, enum preempt_type preempt_type)
{
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:
return core_scsi3_pro_preempt(cmd, type, scope, res_key,
sa_res_key, preempt_type);
default:
pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
" Type: 0x%02x\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "", type);
return TCM_INVALID_CDB_FIELD;
}
}
static sense_reason_t
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, *tmp_lun;
struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
const 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->t10_pr;
unsigned char *buf;
const unsigned char *initiator_str;
char *iport_ptr = NULL, i_buf[PR_REG_ISID_ID_LEN] = { };
u32 tid_len, tmp_tid_len;
int new_reg = 0, type, scope, matching_iname;
sense_reason_t ret;
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");
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
}
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");
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
}
/*
* 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);
ret = TCM_RESERVATION_CONFLICT;
goto out_put_pr_reg;
}
/*
* 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");
ret = TCM_INVALID_PARAMETER_LIST;
goto out_put_pr_reg;
}
/*
* 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);
if (!buf) {
ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
goto out_put_pr_reg;
}
rtpi = get_unaligned_be16(&buf[18]);
tid_len = get_unaligned_be32(&buf[20]);
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);
ret = TCM_INVALID_PARAMETER_LIST;
goto out_put_pr_reg;
}
spin_lock(&dev->se_port_lock);
list_for_each_entry(tmp_lun, &dev->dev_sep_list, lun_dev_link) {
if (tmp_lun->lun_tpg->tpg_rtpi != rtpi)
continue;
dest_se_tpg = tmp_lun->lun_tpg;
dest_tf_ops = dest_se_tpg->se_tpg_tfo;
if (!dest_tf_ops)
continue;
atomic_inc_mb(&dest_se_tpg->tpg_pr_ref_count);
spin_unlock(&dev->se_port_lock);
if (core_scsi3_tpg_depend_item(dest_se_tpg)) {
pr_err("core_scsi3_tpg_depend_item() failed"
" for dest_se_tpg\n");
atomic_dec_mb(&dest_se_tpg->tpg_pr_ref_count);
ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
goto out_put_pr_reg;
}
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);
ret = TCM_INVALID_PARAMETER_LIST;
goto out_put_pr_reg;
}
buf = transport_kmap_data_sg(cmd);
if (!buf) {
ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
goto out_put_pr_reg;
}
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_se_tpg->proto_id) {
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_se_tpg->proto_id,
dest_tf_ops->fabric_name);
ret = TCM_INVALID_PARAMETER_LIST;
goto out;
}
initiator_str = target_parse_pr_out_transport_id(dest_se_tpg,
&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");
ret = TCM_INVALID_PARAMETER_LIST;
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->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);
ret = TCM_INVALID_PARAMETER_LIST;
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);
ret = TCM_INVALID_PARAMETER_LIST;
goto out;
}
after_iport_check:
/*
* Locate the destination struct se_node_acl from the received Transport ID
*/
mutex_lock(&dest_se_tpg->acl_node_mutex);
dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
initiator_str);
if (dest_node_acl)
atomic_inc_mb(&dest_node_acl->acl_pr_ref_count);
mutex_unlock(&dest_se_tpg->acl_node_mutex);
if (!dest_node_acl) {
pr_err("Unable to locate %s dest_node_acl for"
" TransportID%s\n", dest_tf_ops->fabric_name,
initiator_str);
ret = TCM_INVALID_PARAMETER_LIST;
goto out;
}
if (core_scsi3_nodeacl_depend_item(dest_node_acl)) {
pr_err("core_scsi3_nodeacl_depend_item() for"
" dest_node_acl\n");
atomic_dec_mb(&dest_node_acl->acl_pr_ref_count);
dest_node_acl = NULL;
ret = TCM_INVALID_PARAMETER_LIST;
goto out;
}
pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
" %s from TransportID\n", dest_tf_ops->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->fabric_name, rtpi);
ret = TCM_INVALID_PARAMETER_LIST;
goto out;
}
if (core_scsi3_lunacl_depend_item(dest_se_deve)) {
pr_err("core_scsi3_lunacl_depend_item() failed\n");
kref_put(&dest_se_deve->pr_kref, target_pr_kref_release);
dest_se_deve = NULL;
ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
goto out;
}
pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
" ACL for dest_se_deve->mapped_lun: %llu\n",
dest_tf_ops->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);
ret = TCM_INVALID_CDB_FIELD;
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 (!is_reservation_holder(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);
ret = TCM_RESERVATION_CONFLICT;
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);
ret = TCM_RESERVATION_CONFLICT;
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;
*
* 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) {
struct se_lun *dest_lun = dest_se_deve->se_lun;
spin_unlock(&dev->dev_reservation_lock);
if (core_scsi3_alloc_registration(cmd->se_dev, dest_node_acl,
dest_lun, dest_se_deve, dest_se_deve->mapped_lun,
iport_ptr, sa_res_key, 0, aptpl, 2, 1)) {
ret = TCM_INSUFFICIENT_REGISTRATION_RESOURCES;
goto out;
}
spin_lock(&dev->dev_reservation_lock);
dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
iport_ptr);
new_reg = 1;
} else {
/*
* e) Retain the reservation key specified in the SERVICE ACTION
* RESERVATION KEY field and associated information;
*/
dest_pr_reg->pr_res_key = sa_res_key;
}
/*
* 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, 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;
core_pr_dump_initiator_port(pr_reg, i_buf, 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->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->fabric_name, pr_reg_nacl->initiatorname,
i_buf, dest_tf_ops->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);
core_scsi3_update_and_write_aptpl(cmd->se_dev, aptpl);
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);
out_put_pr_reg:
core_scsi3_put_pr_reg(pr_reg);
return ret;
}
static sense_reason_t
target_try_pr_out_pt(struct se_cmd *cmd, u8 sa, u64 res_key, u64 sa_res_key,
u8 type, bool aptpl, bool all_tg_pt, bool spec_i_pt)
{
struct exec_cmd_ops *ops = cmd->protocol_data;
if (!cmd->se_sess || !cmd->se_lun) {
pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
}
if (!ops->execute_pr_out) {
pr_err("SPC-3 PR: Device has been configured for PR passthrough but it's not supported by the backend.\n");
return TCM_UNSUPPORTED_SCSI_OPCODE;
}
switch (sa) {
case PRO_REGISTER_AND_MOVE:
case PRO_REPLACE_LOST_RESERVATION:
pr_err("SPC-3 PR: PRO_REGISTER_AND_MOVE and PRO_REPLACE_LOST_RESERVATION are not supported by PR passthrough.\n");
return TCM_UNSUPPORTED_SCSI_OPCODE;
}
if (spec_i_pt || all_tg_pt) {
pr_err("SPC-3 PR: SPEC_I_PT and ALL_TG_PT are not supported by PR passthrough.\n");
return TCM_UNSUPPORTED_SCSI_OPCODE;
}
return ops->execute_pr_out(cmd, sa, res_key, sa_res_key, type, aptpl);
}
/*
* See spc4r17 section 6.14 Table 170
*/
sense_reason_t
target_scsi3_emulate_pr_out(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
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;
sense_reason_t 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_reservation_flags & DRF_SPC2_RESERVATIONS) {
pr_err("Received PERSISTENT_RESERVE CDB while legacy"
" SPC-2 reservation is held, returning"
" RESERVATION_CONFLICT\n");
return TCM_RESERVATION_CONFLICT;
}
/*
* 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)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
if (cmd->data_length < 24) {
pr_warn("SPC-PR: Received PR OUT parameter list"
" length too small: %u\n", cmd->data_length);
return TCM_PARAMETER_LIST_LENGTH_ERROR;
}
/*
* 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);
if (!buf)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
/*
* From PERSISTENT_RESERVE_OUT parameter list (payload)
*/
res_key = get_unaligned_be64(&buf[0]);
sa_res_key = get_unaligned_be64(&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);
}
/*
* If the backend device has been configured to force APTPL metadata
* write-out, go ahead and propigate aptpl=1 down now.
*/
if (dev->dev_attrib.force_pr_aptpl)
aptpl = 1;
transport_kunmap_data_sg(cmd);
buf = NULL;
/*
* SPEC_I_PT=1 is only valid for Service action: REGISTER
*/
if (spec_i_pt && (sa != PRO_REGISTER))
return TCM_INVALID_PARAMETER_LIST;
/*
* 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 && (sa != PRO_REGISTER_AND_MOVE) &&
(cmd->data_length != 24)) {
pr_warn("SPC-PR: Received PR OUT illegal parameter"
" list length: %u\n", cmd->data_length);
return TCM_PARAMETER_LIST_LENGTH_ERROR;
}
if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR) {
ret = target_try_pr_out_pt(cmd, sa, res_key, sa_res_key, type,
aptpl, all_tg_pt, spec_i_pt);
goto done;
}
/*
* (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, REGISTER);
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, PREEMPT);
break;
case PRO_PREEMPT_AND_ABORT:
ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
res_key, sa_res_key, PREEMPT_AND_ABORT);
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, REGISTER_AND_IGNORE_EXISTING_KEY);
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", sa);
return TCM_INVALID_CDB_FIELD;
}
done:
if (!ret)
target_complete_cmd(cmd, SAM_STAT_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 sense_reason_t
core_scsi3_pri_read_keys(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_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);
return TCM_INVALID_CDB_FIELD;
}
buf = transport_kmap_data_sg(cmd);
if (!buf)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
put_unaligned_be32(dev->t10_pr.pr_generation, buf);
spin_lock(&dev->t10_pr.registration_lock);
list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
pr_reg_list) {
/*
* Check for overflow of 8byte PRI READ_KEYS payload and
* next reservation key list descriptor.
*/
if (off + 8 <= cmd->data_length) {
put_unaligned_be64(pr_reg->pr_res_key, &buf[off]);
off += 8;
}
/*
* SPC5r17: 6.16.2 READ KEYS service action
* The ADDITIONAL LENGTH field indicates the number of bytes in
* the Reservation key list. The contents of the ADDITIONAL
* LENGTH field are not altered based on the allocation length
*/
add_len += 8;
}
spin_unlock(&dev->t10_pr.registration_lock);
put_unaligned_be32(add_len, &buf[4]);
target_set_cmd_data_length(cmd, 8 + add_len);
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 sense_reason_t
core_scsi3_pri_read_reservation(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
struct t10_pr_registration *pr_reg;
unsigned char *buf;
u64 pr_res_key;
u32 add_len = 0;
if (cmd->data_length < 8) {
pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
" too small\n", cmd->data_length);
return TCM_INVALID_CDB_FIELD;
}
buf = transport_kmap_data_sg(cmd);
if (!buf)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]);
spin_lock(&dev->dev_reservation_lock);
pr_reg = dev->dev_pr_res_holder;
if (pr_reg) {
/*
* Set the Additional Length to 16 when a reservation is held
*/
add_len = 16;
put_unaligned_be32(add_len, &buf[4]);
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;
put_unaligned_be64(pr_res_key, &buf[8]);
/*
* Set the SCOPE and TYPE
*/
buf[21] = (pr_reg->pr_res_scope & 0xf0) |
(pr_reg->pr_res_type & 0x0f);
}
target_set_cmd_data_length(cmd, 8 + add_len);
err:
spin_unlock(&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 sense_reason_t
core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
struct t10_reservation *pr_tmpl = &dev->t10_pr;
unsigned char *buf;
u16 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);
return TCM_INVALID_CDB_FIELD;
}
buf = transport_kmap_data_sg(cmd);
if (!buf)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
put_unaligned_be16(len, &buf[0]);
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 */
target_set_cmd_data_length(cmd, len);
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 sense_reason_t
core_scsi3_pri_read_full_status(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
struct se_node_acl *se_nacl;
struct se_portal_group *se_tpg;
struct t10_pr_registration *pr_reg, *pr_reg_tmp;
struct t10_reservation *pr_tmpl = &dev->t10_pr;
unsigned char *buf;
u32 add_desc_len = 0, add_len = 0;
u32 off = 8; /* off into first Full Status descriptor */
int format_code = 0, pr_res_type = 0, pr_res_scope = 0;
int exp_desc_len, desc_len;
bool all_reg = false;
if (cmd->data_length < 8) {
pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
" too small\n", cmd->data_length);
return TCM_INVALID_CDB_FIELD;
}
buf = transport_kmap_data_sg(cmd);
if (!buf)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]);
spin_lock(&dev->dev_reservation_lock);
if (dev->dev_pr_res_holder) {
struct t10_pr_registration *pr_holder = dev->dev_pr_res_holder;
if (pr_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG ||
pr_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG) {
all_reg = true;
pr_res_type = pr_holder->pr_res_type;
pr_res_scope = pr_holder->pr_res_scope;
}
}
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) {
se_nacl = pr_reg->pr_reg_nacl;
se_tpg = pr_reg->pr_reg_nacl->se_tpg;
add_desc_len = 0;
atomic_inc_mb(&pr_reg->pr_res_holders);
spin_unlock(&pr_tmpl->registration_lock);
/*
* Determine expected length of $FABRIC_MOD specific
* TransportID full status descriptor..
*/
exp_desc_len = target_get_pr_transport_id_len(se_nacl, pr_reg,
&format_code);
if (exp_desc_len < 0 ||
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_mb(&pr_reg->pr_res_holders);
break;
}
/*
* Set RESERVATION KEY
*/
put_unaligned_be64(pr_reg->pr_res_key, &buf[off]);
off += 8;
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 or there is an All Registrants reservation
* active, 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 if (all_reg) {
buf[off++] |= 0x01;
buf[off++] = (pr_res_scope & 0xf0) |
(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) {
u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi;
put_unaligned_be16(sep_rtpi, &buf[off]);
off += 2;
} else
off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
buf[off+4] = se_tpg->proto_id;
/*
* Now, have the $FABRIC_MOD fill in the transport ID.
*/
desc_len = target_get_pr_transport_id(se_nacl, pr_reg,
&format_code, &buf[off+4]);
spin_lock(&pr_tmpl->registration_lock);
atomic_dec_mb(&pr_reg->pr_res_holders);
if (desc_len < 0)
break;
/*
* Set the ADDITIONAL DESCRIPTOR LENGTH
*/
put_unaligned_be32(desc_len, &buf[off]);
off += 4;
/*
* 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
*/
put_unaligned_be32(add_len, &buf[4]);
target_set_cmd_data_length(cmd, 8 + add_len);
transport_kunmap_data_sg(cmd);
return 0;
}
static sense_reason_t target_try_pr_in_pt(struct se_cmd *cmd, u8 sa)
{
struct exec_cmd_ops *ops = cmd->protocol_data;
unsigned char *buf;
sense_reason_t ret;
if (cmd->data_length < 8) {
pr_err("PRIN SA SCSI Data Length: %u too small\n",
cmd->data_length);
return TCM_INVALID_CDB_FIELD;
}
if (!ops->execute_pr_in) {
pr_err("SPC-3 PR: Device has been configured for PR passthrough but it's not supported by the backend.\n");
return TCM_UNSUPPORTED_SCSI_OPCODE;
}
if (sa == PRI_READ_FULL_STATUS) {
pr_err("SPC-3 PR: PRI_READ_FULL_STATUS is not supported by PR passthrough.\n");
return TCM_UNSUPPORTED_SCSI_OPCODE;
}
buf = transport_kmap_data_sg(cmd);
if (!buf)
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
ret = ops->execute_pr_in(cmd, sa, buf);
transport_kunmap_data_sg(cmd);
return ret;
}
sense_reason_t
target_scsi3_emulate_pr_in(struct se_cmd *cmd)
{
u8 sa = cmd->t_task_cdb[1] & 0x1f;
sense_reason_t 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_reservation_flags & DRF_SPC2_RESERVATIONS) {
pr_err("Received PERSISTENT_RESERVE CDB while legacy"
" SPC-2 reservation is held, returning"
" RESERVATION_CONFLICT\n");
return TCM_RESERVATION_CONFLICT;
}
if (cmd->se_dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR) {
ret = target_try_pr_in_pt(cmd, sa);
goto done;
}
switch (sa) {
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);
return TCM_INVALID_CDB_FIELD;
}
done:
if (!ret)
target_complete_cmd(cmd, SAM_STAT_GOOD);
return ret;
}
sense_reason_t
target_check_reservation(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
sense_reason_t ret;
if (!cmd->se_sess)
return 0;
if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)
return 0;
if (!dev->dev_attrib.emulate_pr)
return 0;
if (dev->transport_flags & TRANSPORT_FLAG_PASSTHROUGH_PGR)
return 0;
spin_lock(&dev->dev_reservation_lock);
if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)
ret = target_scsi2_reservation_check(cmd);
else
ret = target_scsi3_pr_reservation_check(cmd);
spin_unlock(&dev->dev_reservation_lock);
return ret;
}
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