linux-hardened/drivers/target/target_core_pr.c
Linus Torvalds c9bfa7d75b Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending
Pull scsi-target changes from Nicholas Bellinger:
 "There has been lots of work in existing code in a number of areas this
  past cycle.  The major highlights have been:

   * Removal of transport_do_task_sg_chain() from core + fabrics
     (Roland)
   * target-core: Removal of se_task abstraction from target-core and
     enforce hw_max_sectors for pSCSI backends (hch)
   * Re-factoring of iscsi-target tx immediate/response queues (agrover)
   * Conversion of iscsi-target back to using target core memory
     allocation logic (agrover)

  We've had one last minute iscsi-target patch go into for-next to
  address a nasty regression bug related to the target core allocation
  logic conversion from agrover that is not included in friday's
  linux-next build, but has been included in this series.

  On the new fabric module code front for-3.5, here is a brief status
  update for the three currently in flight this round:

   * usb-gadget target driver:

  Sebastian Siewior's driver for supporting usb-gadget target mode
  operation.  This will be going out as a separate PULL request from
  target-pending/usb-target-merge with subsystem maintainer ACKs.  There
  is one minor target-core patch in this series required to function.

   * sbp ieee-1394/firewire target driver:

  Chris Boot's driver for supportting the Serial Block Protocol (SBP)
  across IEEE-1394 Firewire hardware.  This will be going out as a
  separate PULL request from target-pending/sbp-target-merge with two
  additional drivers/firewire/ patches w/ subsystem maintainer ACKs.

   * qla2xxx LLD target mode infrastructure changes + tcm_qla2xxx:

  The Qlogic >= 24xx series HW target mode LLD infrastructure patch-set
  and tcm_qla2xxx fabric driver.  Support for FC target mode using
  qla2xxx LLD code has been officially submitted by Qlogic to James
  below, and is currently outstanding but not yet merged into
  scsi.git/for-next..

    [PATCH 00/22] qla2xxx: Updates for scsi "misc" branch
    http://www.spinics.net/lists/linux-scsi/msg59350.html

  Note there are *zero* direct dependencies upon this for-next series
  for the qla2xxx LLD target + tcm_qla2xxx patches submitted above, and
  over the last days the target mode team has been tracking down an
  tcm_qla2xxx specific active I/O shutdown bug that appears to now be
  almost squashed for 3.5-rc-fixes."

* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (47 commits)
  iscsi-target: Fix iov_count calculation bug in iscsit_allocate_iovecs
  iscsi-target: remove dead code in iscsi_check_valuelist_for_support
  target: Handle ATA_16 passthrough for pSCSI backend devices
  target: Add MI_REPORT_TARGET_PGS ext. header + implict_trans_secs attribute
  target: Fix MAINTENANCE_IN service action CDB checks to use lower 5 bits
  target: add support for the WRITE_VERIFY command
  target: make target_put_session void
  target: cleanup transport_execute_tasks()
  target: Remove max_sectors device attribute for modern se_task less code
  target: lock => unlock typo in transport_lun_wait_for_tasks
  target: Enforce hw_max_sectors for SCF_SCSI_DATA_SG_IO_CDB
  target: remove the t_se_count field in struct se_cmd
  target: remove the t_task_cdbs_ex_left field in struct se_cmd
  target: remove the t_task_cdbs_left field in struct se_cmd
  target: remove struct se_task
  target: move the state and execute lists to the command
  target: simplify command to task linkage
  target: always allocate a single task
  target: replace ->execute_task with ->execute_cmd
  target: remove the task_sectors field in struct se_task
  ...
2012-05-21 17:37:09 -07:00

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/*******************************************************************************
* Filename: target_core_pr.c
*
* This file contains SPC-3 compliant persistent reservations and
* legacy SPC-2 reservations with compatible reservation handling (CRH=1)
*
* Copyright (c) 2009, 2010 Rising Tide Systems
* Copyright (c) 2009, 2010 Linux-iSCSI.org
*
* Nicholas A. Bellinger <nab@kernel.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
******************************************************************************/
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <asm/unaligned.h>
#include <target/target_core_base.h>
#include <target/target_core_backend.h>
#include <target/target_core_fabric.h>
#include <target/target_core_configfs.h>
#include "target_core_internal.h"
#include "target_core_pr.h"
#include "target_core_ua.h"
/*
* Used for Specify Initiator Ports Capable Bit (SPEC_I_PT)
*/
struct pr_transport_id_holder {
int dest_local_nexus;
struct t10_pr_registration *dest_pr_reg;
struct se_portal_group *dest_tpg;
struct se_node_acl *dest_node_acl;
struct se_dev_entry *dest_se_deve;
struct list_head dest_list;
};
int core_pr_dump_initiator_port(
struct t10_pr_registration *pr_reg,
char *buf,
u32 size)
{
if (!pr_reg->isid_present_at_reg)
return 0;
snprintf(buf, size, ",i,0x%s", &pr_reg->pr_reg_isid[0]);
return 1;
}
static void __core_scsi3_complete_pro_release(struct se_device *, struct se_node_acl *,
struct t10_pr_registration *, int);
static int core_scsi2_reservation_seq_non_holder(
struct se_cmd *cmd,
unsigned char *cdb,
u32 pr_reg_type)
{
switch (cdb[0]) {
case INQUIRY:
case RELEASE:
case RELEASE_10:
return 0;
default:
return 1;
}
return 1;
}
static int core_scsi2_reservation_check(struct se_cmd *cmd, u32 *pr_reg_type)
{
struct se_device *dev = cmd->se_dev;
struct se_session *sess = cmd->se_sess;
int ret;
if (!sess)
return 0;
spin_lock(&dev->dev_reservation_lock);
if (!dev->dev_reserved_node_acl || !sess) {
spin_unlock(&dev->dev_reservation_lock);
return 0;
}
if (dev->dev_reserved_node_acl != sess->se_node_acl) {
spin_unlock(&dev->dev_reservation_lock);
return -EINVAL;
}
if (!(dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID)) {
spin_unlock(&dev->dev_reservation_lock);
return 0;
}
ret = (dev->dev_res_bin_isid == sess->sess_bin_isid) ? 0 : -EINVAL;
spin_unlock(&dev->dev_reservation_lock);
return ret;
}
static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
struct se_node_acl *, struct se_session *);
static void core_scsi3_put_pr_reg(struct t10_pr_registration *);
static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd)
{
struct se_session *se_sess = cmd->se_sess;
struct se_subsystem_dev *su_dev = cmd->se_dev->se_sub_dev;
struct t10_pr_registration *pr_reg;
struct t10_reservation *pr_tmpl = &su_dev->t10_pr;
int crh = (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS);
int conflict = 0;
if (!crh)
return -EINVAL;
pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
se_sess);
if (pr_reg) {
/*
* From spc4r17 5.7.3 Exceptions to SPC-2 RESERVE and RELEASE
* behavior
*
* A RESERVE(6) or RESERVE(10) command shall complete with GOOD
* status, but no reservation shall be established and the
* persistent reservation shall not be changed, if the command
* is received from a) and b) below.
*
* A RELEASE(6) or RELEASE(10) command shall complete with GOOD
* status, but the persistent reservation shall not be released,
* if the command is received from a) and b)
*
* a) An I_T nexus that is a persistent reservation holder; or
* b) An I_T nexus that is registered if a registrants only or
* all registrants type persistent reservation is present.
*
* In all other cases, a RESERVE(6) command, RESERVE(10) command,
* RELEASE(6) command, or RELEASE(10) command shall be processed
* as defined in SPC-2.
*/
if (pr_reg->pr_res_holder) {
core_scsi3_put_pr_reg(pr_reg);
return 1;
}
if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
(pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) ||
(pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
(pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
core_scsi3_put_pr_reg(pr_reg);
return 1;
}
core_scsi3_put_pr_reg(pr_reg);
conflict = 1;
} else {
/*
* Following spc2r20 5.5.1 Reservations overview:
*
* If a logical unit has executed a PERSISTENT RESERVE OUT
* command with the REGISTER or the REGISTER AND IGNORE
* EXISTING KEY service action and is still registered by any
* initiator, all RESERVE commands and all RELEASE commands
* regardless of initiator shall conflict and shall terminate
* with a RESERVATION CONFLICT status.
*/
spin_lock(&pr_tmpl->registration_lock);
conflict = (list_empty(&pr_tmpl->registration_list)) ? 0 : 1;
spin_unlock(&pr_tmpl->registration_lock);
}
if (conflict) {
pr_err("Received legacy SPC-2 RESERVE/RELEASE"
" while active SPC-3 registrations exist,"
" returning RESERVATION_CONFLICT\n");
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EBUSY;
}
return 0;
}
int target_scsi2_reservation_release(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
struct se_session *sess = cmd->se_sess;
struct se_portal_group *tpg = sess->se_tpg;
int ret = 0, rc;
if (!sess || !tpg)
goto out;
rc = target_check_scsi2_reservation_conflict(cmd);
if (rc == 1)
goto out;
else if (rc < 0) {
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
ret = -EINVAL;
goto out;
}
ret = 0;
spin_lock(&dev->dev_reservation_lock);
if (!dev->dev_reserved_node_acl || !sess)
goto out_unlock;
if (dev->dev_reserved_node_acl != sess->se_node_acl)
goto out_unlock;
if (dev->dev_res_bin_isid != sess->sess_bin_isid)
goto out_unlock;
dev->dev_reserved_node_acl = NULL;
dev->dev_flags &= ~DF_SPC2_RESERVATIONS;
if (dev->dev_flags & DF_SPC2_RESERVATIONS_WITH_ISID) {
dev->dev_res_bin_isid = 0;
dev->dev_flags &= ~DF_SPC2_RESERVATIONS_WITH_ISID;
}
pr_debug("SCSI-2 Released reservation for %s LUN: %u ->"
" MAPPED LUN: %u for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
sess->se_node_acl->initiatorname);
out_unlock:
spin_unlock(&dev->dev_reservation_lock);
out:
if (!ret)
target_complete_cmd(cmd, GOOD);
return ret;
}
int target_scsi2_reservation_reserve(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
struct se_session *sess = cmd->se_sess;
struct se_portal_group *tpg = sess->se_tpg;
int ret = 0, rc;
if ((cmd->t_task_cdb[1] & 0x01) &&
(cmd->t_task_cdb[1] & 0x02)) {
pr_err("LongIO and Obselete Bits set, returning"
" ILLEGAL_REQUEST\n");
cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
ret = -EINVAL;
goto out;
}
/*
* This is currently the case for target_core_mod passthrough struct se_cmd
* ops
*/
if (!sess || !tpg)
goto out;
rc = target_check_scsi2_reservation_conflict(cmd);
if (rc == 1)
goto out;
else if (rc < 0) {
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
ret = -EINVAL;
goto out;
}
ret = 0;
spin_lock(&dev->dev_reservation_lock);
if (dev->dev_reserved_node_acl &&
(dev->dev_reserved_node_acl != sess->se_node_acl)) {
pr_err("SCSI-2 RESERVATION CONFLIFT for %s fabric\n",
tpg->se_tpg_tfo->get_fabric_name());
pr_err("Original reserver LUN: %u %s\n",
cmd->se_lun->unpacked_lun,
dev->dev_reserved_node_acl->initiatorname);
pr_err("Current attempt - LUN: %u -> MAPPED LUN: %u"
" from %s \n", cmd->se_lun->unpacked_lun,
cmd->se_deve->mapped_lun,
sess->se_node_acl->initiatorname);
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
ret = -EINVAL;
goto out_unlock;
}
dev->dev_reserved_node_acl = sess->se_node_acl;
dev->dev_flags |= DF_SPC2_RESERVATIONS;
if (sess->sess_bin_isid != 0) {
dev->dev_res_bin_isid = sess->sess_bin_isid;
dev->dev_flags |= DF_SPC2_RESERVATIONS_WITH_ISID;
}
pr_debug("SCSI-2 Reserved %s LUN: %u -> MAPPED LUN: %u"
" for %s\n", tpg->se_tpg_tfo->get_fabric_name(),
cmd->se_lun->unpacked_lun, cmd->se_deve->mapped_lun,
sess->se_node_acl->initiatorname);
out_unlock:
spin_unlock(&dev->dev_reservation_lock);
out:
if (!ret)
target_complete_cmd(cmd, GOOD);
return ret;
}
/*
* Begin SPC-3/SPC-4 Persistent Reservations emulation support
*
* This function is called by those initiator ports who are *NOT*
* the active PR reservation holder when a reservation is present.
*/
static int core_scsi3_pr_seq_non_holder(
struct se_cmd *cmd,
unsigned char *cdb,
u32 pr_reg_type)
{
struct se_dev_entry *se_deve;
struct se_session *se_sess = cmd->se_sess;
int other_cdb = 0, ignore_reg;
int registered_nexus = 0, ret = 1; /* Conflict by default */
int all_reg = 0, reg_only = 0; /* ALL_REG, REG_ONLY */
int we = 0; /* Write Exclusive */
int legacy = 0; /* Act like a legacy device and return
* RESERVATION CONFLICT on some CDBs */
/*
* A legacy SPC-2 reservation is being held.
*/
if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS)
return core_scsi2_reservation_seq_non_holder(cmd,
cdb, pr_reg_type);
se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
/*
* Determine if the registration should be ignored due to
* non-matching ISIDs in core_scsi3_pr_reservation_check().
*/
ignore_reg = (pr_reg_type & 0x80000000);
if (ignore_reg)
pr_reg_type &= ~0x80000000;
switch (pr_reg_type) {
case PR_TYPE_WRITE_EXCLUSIVE:
we = 1;
case PR_TYPE_EXCLUSIVE_ACCESS:
/*
* Some commands are only allowed for the persistent reservation
* holder.
*/
if ((se_deve->def_pr_registered) && !(ignore_reg))
registered_nexus = 1;
break;
case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
we = 1;
case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
/*
* Some commands are only allowed for registered I_T Nexuses.
*/
reg_only = 1;
if ((se_deve->def_pr_registered) && !(ignore_reg))
registered_nexus = 1;
break;
case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
we = 1;
case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
/*
* Each registered I_T Nexus is a reservation holder.
*/
all_reg = 1;
if ((se_deve->def_pr_registered) && !(ignore_reg))
registered_nexus = 1;
break;
default:
return -EINVAL;
}
/*
* Referenced from spc4r17 table 45 for *NON* PR holder access
*/
switch (cdb[0]) {
case SECURITY_PROTOCOL_IN:
if (registered_nexus)
return 0;
ret = (we) ? 0 : 1;
break;
case MODE_SENSE:
case MODE_SENSE_10:
case READ_ATTRIBUTE:
case READ_BUFFER:
case RECEIVE_DIAGNOSTIC:
if (legacy) {
ret = 1;
break;
}
if (registered_nexus) {
ret = 0;
break;
}
ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
break;
case PERSISTENT_RESERVE_OUT:
/*
* This follows PERSISTENT_RESERVE_OUT service actions that
* are allowed in the presence of various reservations.
* See spc4r17, table 46
*/
switch (cdb[1] & 0x1f) {
case PRO_CLEAR:
case PRO_PREEMPT:
case PRO_PREEMPT_AND_ABORT:
ret = (registered_nexus) ? 0 : 1;
break;
case PRO_REGISTER:
case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
ret = 0;
break;
case PRO_REGISTER_AND_MOVE:
case PRO_RESERVE:
ret = 1;
break;
case PRO_RELEASE:
ret = (registered_nexus) ? 0 : 1;
break;
default:
pr_err("Unknown PERSISTENT_RESERVE_OUT service"
" action: 0x%02x\n", cdb[1] & 0x1f);
return -EINVAL;
}
break;
case RELEASE:
case RELEASE_10:
/* Handled by CRH=1 in target_scsi2_reservation_release() */
ret = 0;
break;
case RESERVE:
case RESERVE_10:
/* Handled by CRH=1 in target_scsi2_reservation_reserve() */
ret = 0;
break;
case TEST_UNIT_READY:
ret = (legacy) ? 1 : 0; /* Conflict for legacy */
break;
case MAINTENANCE_IN:
switch (cdb[1] & 0x1f) {
case MI_MANAGEMENT_PROTOCOL_IN:
if (registered_nexus) {
ret = 0;
break;
}
ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
break;
case MI_REPORT_SUPPORTED_OPERATION_CODES:
case MI_REPORT_SUPPORTED_TASK_MANAGEMENT_FUNCTIONS:
if (legacy) {
ret = 1;
break;
}
if (registered_nexus) {
ret = 0;
break;
}
ret = (we) ? 0 : 1; /* Allowed Write Exclusive */
break;
case MI_REPORT_ALIASES:
case MI_REPORT_IDENTIFYING_INFORMATION:
case MI_REPORT_PRIORITY:
case MI_REPORT_TARGET_PGS:
case MI_REPORT_TIMESTAMP:
ret = 0; /* Allowed */
break;
default:
pr_err("Unknown MI Service Action: 0x%02x\n",
(cdb[1] & 0x1f));
return -EINVAL;
}
break;
case ACCESS_CONTROL_IN:
case ACCESS_CONTROL_OUT:
case INQUIRY:
case LOG_SENSE:
case READ_MEDIA_SERIAL_NUMBER:
case REPORT_LUNS:
case REQUEST_SENSE:
case PERSISTENT_RESERVE_IN:
ret = 0; /*/ Allowed CDBs */
break;
default:
other_cdb = 1;
break;
}
/*
* Case where the CDB is explicitly allowed in the above switch
* statement.
*/
if (!ret && !other_cdb) {
pr_debug("Allowing explict CDB: 0x%02x for %s"
" reservation holder\n", cdb[0],
core_scsi3_pr_dump_type(pr_reg_type));
return ret;
}
/*
* Check if write exclusive initiator ports *NOT* holding the
* WRITE_EXCLUSIVE_* reservation.
*/
if ((we) && !(registered_nexus)) {
if (cmd->data_direction == DMA_TO_DEVICE) {
/*
* Conflict for write exclusive
*/
pr_debug("%s Conflict for unregistered nexus"
" %s CDB: 0x%02x to %s reservation\n",
transport_dump_cmd_direction(cmd),
se_sess->se_node_acl->initiatorname, cdb[0],
core_scsi3_pr_dump_type(pr_reg_type));
return 1;
} else {
/*
* Allow non WRITE CDBs for all Write Exclusive
* PR TYPEs to pass for registered and
* non-registered_nexuxes NOT holding the reservation.
*
* We only make noise for the unregisterd nexuses,
* as we expect registered non-reservation holding
* nexuses to issue CDBs.
*/
if (!registered_nexus) {
pr_debug("Allowing implict CDB: 0x%02x"
" for %s reservation on unregistered"
" nexus\n", cdb[0],
core_scsi3_pr_dump_type(pr_reg_type));
}
return 0;
}
} else if ((reg_only) || (all_reg)) {
if (registered_nexus) {
/*
* For PR_*_REG_ONLY and PR_*_ALL_REG reservations,
* allow commands from registered nexuses.
*/
pr_debug("Allowing implict CDB: 0x%02x for %s"
" reservation\n", cdb[0],
core_scsi3_pr_dump_type(pr_reg_type));
return 0;
}
}
pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
" for %s reservation\n", transport_dump_cmd_direction(cmd),
(registered_nexus) ? "" : "un",
se_sess->se_node_acl->initiatorname, cdb[0],
core_scsi3_pr_dump_type(pr_reg_type));
return 1; /* Conflict by default */
}
static u32 core_scsi3_pr_generation(struct se_device *dev)
{
struct se_subsystem_dev *su_dev = dev->se_sub_dev;
u32 prg;
/*
* PRGeneration field shall contain the value of a 32-bit wrapping
* counter mainted by the device server.
*
* Note that this is done regardless of Active Persist across
* Target PowerLoss (APTPL)
*
* See spc4r17 section 6.3.12 READ_KEYS service action
*/
spin_lock(&dev->dev_reservation_lock);
prg = su_dev->t10_pr.pr_generation++;
spin_unlock(&dev->dev_reservation_lock);
return prg;
}
static int core_scsi3_pr_reservation_check(
struct se_cmd *cmd,
u32 *pr_reg_type)
{
struct se_device *dev = cmd->se_dev;
struct se_session *sess = cmd->se_sess;
int ret;
if (!sess)
return 0;
/*
* A legacy SPC-2 reservation is being held.
*/
if (dev->dev_flags & DF_SPC2_RESERVATIONS)
return core_scsi2_reservation_check(cmd, pr_reg_type);
spin_lock(&dev->dev_reservation_lock);
if (!dev->dev_pr_res_holder) {
spin_unlock(&dev->dev_reservation_lock);
return 0;
}
*pr_reg_type = dev->dev_pr_res_holder->pr_res_type;
cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;
if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl) {
spin_unlock(&dev->dev_reservation_lock);
return -EINVAL;
}
if (!dev->dev_pr_res_holder->isid_present_at_reg) {
spin_unlock(&dev->dev_reservation_lock);
return 0;
}
ret = (dev->dev_pr_res_holder->pr_reg_bin_isid ==
sess->sess_bin_isid) ? 0 : -EINVAL;
/*
* Use bit in *pr_reg_type to notify ISID mismatch in
* core_scsi3_pr_seq_non_holder().
*/
if (ret != 0)
*pr_reg_type |= 0x80000000;
spin_unlock(&dev->dev_reservation_lock);
return ret;
}
static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
struct se_device *dev,
struct se_node_acl *nacl,
struct se_dev_entry *deve,
unsigned char *isid,
u64 sa_res_key,
int all_tg_pt,
int aptpl)
{
struct se_subsystem_dev *su_dev = dev->se_sub_dev;
struct t10_pr_registration *pr_reg;
pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_ATOMIC);
if (!pr_reg) {
pr_err("Unable to allocate struct t10_pr_registration\n");
return NULL;
}
pr_reg->pr_aptpl_buf = kzalloc(su_dev->t10_pr.pr_aptpl_buf_len,
GFP_ATOMIC);
if (!pr_reg->pr_aptpl_buf) {
pr_err("Unable to allocate pr_reg->pr_aptpl_buf\n");
kmem_cache_free(t10_pr_reg_cache, pr_reg);
return NULL;
}
INIT_LIST_HEAD(&pr_reg->pr_reg_list);
INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
atomic_set(&pr_reg->pr_res_holders, 0);
pr_reg->pr_reg_nacl = nacl;
pr_reg->pr_reg_deve = deve;
pr_reg->pr_res_mapped_lun = deve->mapped_lun;
pr_reg->pr_aptpl_target_lun = deve->se_lun->unpacked_lun;
pr_reg->pr_res_key = sa_res_key;
pr_reg->pr_reg_all_tg_pt = all_tg_pt;
pr_reg->pr_reg_aptpl = aptpl;
pr_reg->pr_reg_tg_pt_lun = deve->se_lun;
/*
* If an ISID value for this SCSI Initiator Port exists,
* save it to the registration now.
*/
if (isid != NULL) {
pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
pr_reg->isid_present_at_reg = 1;
}
return pr_reg;
}
static int core_scsi3_lunacl_depend_item(struct se_dev_entry *);
static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *);
/*
* Function used for handling PR registrations for ALL_TG_PT=1 and ALL_TG_PT=0
* modes.
*/
static struct t10_pr_registration *__core_scsi3_alloc_registration(
struct se_device *dev,
struct se_node_acl *nacl,
struct se_dev_entry *deve,
unsigned char *isid,
u64 sa_res_key,
int all_tg_pt,
int aptpl)
{
struct se_dev_entry *deve_tmp;
struct se_node_acl *nacl_tmp;
struct se_port *port, *port_tmp;
struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
struct t10_pr_registration *pr_reg, *pr_reg_atp, *pr_reg_tmp, *pr_reg_tmp_safe;
int ret;
/*
* Create a registration for the I_T Nexus upon which the
* PROUT REGISTER was received.
*/
pr_reg = __core_scsi3_do_alloc_registration(dev, nacl, deve, isid,
sa_res_key, all_tg_pt, aptpl);
if (!pr_reg)
return NULL;
/*
* Return pointer to pr_reg for ALL_TG_PT=0
*/
if (!all_tg_pt)
return pr_reg;
/*
* Create list of matching SCSI Initiator Port registrations
* for ALL_TG_PT=1
*/
spin_lock(&dev->se_port_lock);
list_for_each_entry_safe(port, port_tmp, &dev->dev_sep_list, sep_list) {
atomic_inc(&port->sep_tg_pt_ref_cnt);
smp_mb__after_atomic_inc();
spin_unlock(&dev->se_port_lock);
spin_lock_bh(&port->sep_alua_lock);
list_for_each_entry(deve_tmp, &port->sep_alua_list,
alua_port_list) {
/*
* This pointer will be NULL for demo mode MappedLUNs
* that have not been make explict via a ConfigFS
* MappedLUN group for the SCSI Initiator Node ACL.
*/
if (!deve_tmp->se_lun_acl)
continue;
nacl_tmp = deve_tmp->se_lun_acl->se_lun_nacl;
/*
* Skip the matching struct se_node_acl that is allocated
* above..
*/
if (nacl == nacl_tmp)
continue;
/*
* Only perform PR registrations for target ports on
* the same fabric module as the REGISTER w/ ALL_TG_PT=1
* arrived.
*/
if (tfo != nacl_tmp->se_tpg->se_tpg_tfo)
continue;
/*
* Look for a matching Initiator Node ACL in ASCII format
*/
if (strcmp(nacl->initiatorname, nacl_tmp->initiatorname))
continue;
atomic_inc(&deve_tmp->pr_ref_count);
smp_mb__after_atomic_inc();
spin_unlock_bh(&port->sep_alua_lock);
/*
* Grab a configfs group dependency that is released
* for the exception path at label out: below, or upon
* completion of adding ALL_TG_PT=1 registrations in
* __core_scsi3_add_registration()
*/
ret = core_scsi3_lunacl_depend_item(deve_tmp);
if (ret < 0) {
pr_err("core_scsi3_lunacl_depend"
"_item() failed\n");
atomic_dec(&port->sep_tg_pt_ref_cnt);
smp_mb__after_atomic_dec();
atomic_dec(&deve_tmp->pr_ref_count);
smp_mb__after_atomic_dec();
goto out;
}
/*
* Located a matching SCSI Initiator Port on a different
* port, allocate the pr_reg_atp and attach it to the
* pr_reg->pr_reg_atp_list that will be processed once
* the original *pr_reg is processed in
* __core_scsi3_add_registration()
*/
pr_reg_atp = __core_scsi3_do_alloc_registration(dev,
nacl_tmp, deve_tmp, NULL,
sa_res_key, all_tg_pt, aptpl);
if (!pr_reg_atp) {
atomic_dec(&port->sep_tg_pt_ref_cnt);
smp_mb__after_atomic_dec();
atomic_dec(&deve_tmp->pr_ref_count);
smp_mb__after_atomic_dec();
core_scsi3_lunacl_undepend_item(deve_tmp);
goto out;
}
list_add_tail(&pr_reg_atp->pr_reg_atp_mem_list,
&pr_reg->pr_reg_atp_list);
spin_lock_bh(&port->sep_alua_lock);
}
spin_unlock_bh(&port->sep_alua_lock);
spin_lock(&dev->se_port_lock);
atomic_dec(&port->sep_tg_pt_ref_cnt);
smp_mb__after_atomic_dec();
}
spin_unlock(&dev->se_port_lock);
return pr_reg;
out:
list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
&pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
}
kmem_cache_free(t10_pr_reg_cache, pr_reg);
return NULL;
}
int core_scsi3_alloc_aptpl_registration(
struct t10_reservation *pr_tmpl,
u64 sa_res_key,
unsigned char *i_port,
unsigned char *isid,
u32 mapped_lun,
unsigned char *t_port,
u16 tpgt,
u32 target_lun,
int res_holder,
int all_tg_pt,
u8 type)
{
struct t10_pr_registration *pr_reg;
if (!i_port || !t_port || !sa_res_key) {
pr_err("Illegal parameters for APTPL registration\n");
return -EINVAL;
}
pr_reg = kmem_cache_zalloc(t10_pr_reg_cache, GFP_KERNEL);
if (!pr_reg) {
pr_err("Unable to allocate struct t10_pr_registration\n");
return -ENOMEM;
}
pr_reg->pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, GFP_KERNEL);
INIT_LIST_HEAD(&pr_reg->pr_reg_list);
INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
INIT_LIST_HEAD(&pr_reg->pr_reg_aptpl_list);
INIT_LIST_HEAD(&pr_reg->pr_reg_atp_list);
INIT_LIST_HEAD(&pr_reg->pr_reg_atp_mem_list);
atomic_set(&pr_reg->pr_res_holders, 0);
pr_reg->pr_reg_nacl = NULL;
pr_reg->pr_reg_deve = NULL;
pr_reg->pr_res_mapped_lun = mapped_lun;
pr_reg->pr_aptpl_target_lun = target_lun;
pr_reg->pr_res_key = sa_res_key;
pr_reg->pr_reg_all_tg_pt = all_tg_pt;
pr_reg->pr_reg_aptpl = 1;
pr_reg->pr_reg_tg_pt_lun = NULL;
pr_reg->pr_res_scope = 0; /* Always LUN_SCOPE */
pr_reg->pr_res_type = type;
/*
* If an ISID value had been saved in APTPL metadata for this
* SCSI Initiator Port, restore it now.
*/
if (isid != NULL) {
pr_reg->pr_reg_bin_isid = get_unaligned_be64(isid);
snprintf(pr_reg->pr_reg_isid, PR_REG_ISID_LEN, "%s", isid);
pr_reg->isid_present_at_reg = 1;
}
/*
* Copy the i_port and t_port information from caller.
*/
snprintf(pr_reg->pr_iport, PR_APTPL_MAX_IPORT_LEN, "%s", i_port);
snprintf(pr_reg->pr_tport, PR_APTPL_MAX_TPORT_LEN, "%s", t_port);
pr_reg->pr_reg_tpgt = tpgt;
/*
* Set pr_res_holder from caller, the pr_reg who is the reservation
* holder will get it's pointer set in core_scsi3_aptpl_reserve() once
* the Initiator Node LUN ACL from the fabric module is created for
* this registration.
*/
pr_reg->pr_res_holder = res_holder;
list_add_tail(&pr_reg->pr_reg_aptpl_list, &pr_tmpl->aptpl_reg_list);
pr_debug("SPC-3 PR APTPL Successfully added registration%s from"
" metadata\n", (res_holder) ? "+reservation" : "");
return 0;
}
static void core_scsi3_aptpl_reserve(
struct se_device *dev,
struct se_portal_group *tpg,
struct se_node_acl *node_acl,
struct t10_pr_registration *pr_reg)
{
char i_buf[PR_REG_ISID_ID_LEN];
int prf_isid;
memset(i_buf, 0, PR_REG_ISID_ID_LEN);
prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
PR_REG_ISID_ID_LEN);
spin_lock(&dev->dev_reservation_lock);
dev->dev_pr_res_holder = pr_reg;
spin_unlock(&dev->dev_reservation_lock);
pr_debug("SPC-3 PR [%s] Service Action: APTPL RESERVE created"
" new reservation holder TYPE: %s ALL_TG_PT: %d\n",
tpg->se_tpg_tfo->get_fabric_name(),
core_scsi3_pr_dump_type(pr_reg->pr_res_type),
(pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
tpg->se_tpg_tfo->get_fabric_name(), node_acl->initiatorname,
(prf_isid) ? &i_buf[0] : "");
}
static void __core_scsi3_add_registration(struct se_device *, struct se_node_acl *,
struct t10_pr_registration *, int, int);
static int __core_scsi3_check_aptpl_registration(
struct se_device *dev,
struct se_portal_group *tpg,
struct se_lun *lun,
u32 target_lun,
struct se_node_acl *nacl,
struct se_dev_entry *deve)
{
struct t10_pr_registration *pr_reg, *pr_reg_tmp;
struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
unsigned char i_port[PR_APTPL_MAX_IPORT_LEN];
unsigned char t_port[PR_APTPL_MAX_TPORT_LEN];
u16 tpgt;
memset(i_port, 0, PR_APTPL_MAX_IPORT_LEN);
memset(t_port, 0, PR_APTPL_MAX_TPORT_LEN);
/*
* Copy Initiator Port information from struct se_node_acl
*/
snprintf(i_port, PR_APTPL_MAX_IPORT_LEN, "%s", nacl->initiatorname);
snprintf(t_port, PR_APTPL_MAX_TPORT_LEN, "%s",
tpg->se_tpg_tfo->tpg_get_wwn(tpg));
tpgt = tpg->se_tpg_tfo->tpg_get_tag(tpg);
/*
* Look for the matching registrations+reservation from those
* created from APTPL metadata. Note that multiple registrations
* may exist for fabrics that use ISIDs in their SCSI Initiator Port
* TransportIDs.
*/
spin_lock(&pr_tmpl->aptpl_reg_lock);
list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
pr_reg_aptpl_list) {
if (!strcmp(pr_reg->pr_iport, i_port) &&
(pr_reg->pr_res_mapped_lun == deve->mapped_lun) &&
!(strcmp(pr_reg->pr_tport, t_port)) &&
(pr_reg->pr_reg_tpgt == tpgt) &&
(pr_reg->pr_aptpl_target_lun == target_lun)) {
pr_reg->pr_reg_nacl = nacl;
pr_reg->pr_reg_deve = deve;
pr_reg->pr_reg_tg_pt_lun = lun;
list_del(&pr_reg->pr_reg_aptpl_list);
spin_unlock(&pr_tmpl->aptpl_reg_lock);
/*
* At this point all of the pointers in *pr_reg will
* be setup, so go ahead and add the registration.
*/
__core_scsi3_add_registration(dev, nacl, pr_reg, 0, 0);
/*
* If this registration is the reservation holder,
* make that happen now..
*/
if (pr_reg->pr_res_holder)
core_scsi3_aptpl_reserve(dev, tpg,
nacl, pr_reg);
/*
* Reenable pr_aptpl_active to accept new metadata
* updates once the SCSI device is active again..
*/
spin_lock(&pr_tmpl->aptpl_reg_lock);
pr_tmpl->pr_aptpl_active = 1;
}
}
spin_unlock(&pr_tmpl->aptpl_reg_lock);
return 0;
}
int core_scsi3_check_aptpl_registration(
struct se_device *dev,
struct se_portal_group *tpg,
struct se_lun *lun,
struct se_lun_acl *lun_acl)
{
struct se_subsystem_dev *su_dev = dev->se_sub_dev;
struct se_node_acl *nacl = lun_acl->se_lun_nacl;
struct se_dev_entry *deve = nacl->device_list[lun_acl->mapped_lun];
if (su_dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)
return 0;
return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
lun->unpacked_lun, nacl, deve);
}
static void __core_scsi3_dump_registration(
struct target_core_fabric_ops *tfo,
struct se_device *dev,
struct se_node_acl *nacl,
struct t10_pr_registration *pr_reg,
int register_type)
{
struct se_portal_group *se_tpg = nacl->se_tpg;
char i_buf[PR_REG_ISID_ID_LEN];
int prf_isid;
memset(&i_buf[0], 0, PR_REG_ISID_ID_LEN);
prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
PR_REG_ISID_ID_LEN);
pr_debug("SPC-3 PR [%s] Service Action: REGISTER%s Initiator"
" Node: %s%s\n", tfo->get_fabric_name(), (register_type == 2) ?
"_AND_MOVE" : (register_type == 1) ?
"_AND_IGNORE_EXISTING_KEY" : "", nacl->initiatorname,
(prf_isid) ? i_buf : "");
pr_debug("SPC-3 PR [%s] registration on Target Port: %s,0x%04x\n",
tfo->get_fabric_name(), tfo->tpg_get_wwn(se_tpg),
tfo->tpg_get_tag(se_tpg));
pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
" Port(s)\n", tfo->get_fabric_name(),
(pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
dev->transport->name);
pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
" 0x%08x APTPL: %d\n", tfo->get_fabric_name(),
pr_reg->pr_res_key, pr_reg->pr_res_generation,
pr_reg->pr_reg_aptpl);
}
/*
* this function can be called with struct se_device->dev_reservation_lock
* when register_move = 1
*/
static void __core_scsi3_add_registration(
struct se_device *dev,
struct se_node_acl *nacl,
struct t10_pr_registration *pr_reg,
int register_type,
int register_move)
{
struct se_subsystem_dev *su_dev = dev->se_sub_dev;
struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
/*
* Increment PRgeneration counter for struct se_device upon a successful
* REGISTER, see spc4r17 section 6.3.2 READ_KEYS service action
*
* Also, when register_move = 1 for PROUT REGISTER_AND_MOVE service
* action, the struct se_device->dev_reservation_lock will already be held,
* so we do not call core_scsi3_pr_generation() which grabs the lock
* for the REGISTER.
*/
pr_reg->pr_res_generation = (register_move) ?
su_dev->t10_pr.pr_generation++ :
core_scsi3_pr_generation(dev);
spin_lock(&pr_tmpl->registration_lock);
list_add_tail(&pr_reg->pr_reg_list, &pr_tmpl->registration_list);
pr_reg->pr_reg_deve->def_pr_registered = 1;
__core_scsi3_dump_registration(tfo, dev, nacl, pr_reg, register_type);
spin_unlock(&pr_tmpl->registration_lock);
/*
* Skip extra processing for ALL_TG_PT=0 or REGISTER_AND_MOVE.
*/
if (!pr_reg->pr_reg_all_tg_pt || register_move)
return;
/*
* Walk pr_reg->pr_reg_atp_list and add registrations for ALL_TG_PT=1
* allocated in __core_scsi3_alloc_registration()
*/
list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
&pr_reg->pr_reg_atp_list, pr_reg_atp_mem_list) {
list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
pr_reg_tmp->pr_res_generation = core_scsi3_pr_generation(dev);
spin_lock(&pr_tmpl->registration_lock);
list_add_tail(&pr_reg_tmp->pr_reg_list,
&pr_tmpl->registration_list);
pr_reg_tmp->pr_reg_deve->def_pr_registered = 1;
__core_scsi3_dump_registration(tfo, dev,
pr_reg_tmp->pr_reg_nacl, pr_reg_tmp,
register_type);
spin_unlock(&pr_tmpl->registration_lock);
/*
* Drop configfs group dependency reference from
* __core_scsi3_alloc_registration()
*/
core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
}
}
static int core_scsi3_alloc_registration(
struct se_device *dev,
struct se_node_acl *nacl,
struct se_dev_entry *deve,
unsigned char *isid,
u64 sa_res_key,
int all_tg_pt,
int aptpl,
int register_type,
int register_move)
{
struct t10_pr_registration *pr_reg;
pr_reg = __core_scsi3_alloc_registration(dev, nacl, deve, isid,
sa_res_key, all_tg_pt, aptpl);
if (!pr_reg)
return -EPERM;
__core_scsi3_add_registration(dev, nacl, pr_reg,
register_type, register_move);
return 0;
}
static struct t10_pr_registration *__core_scsi3_locate_pr_reg(
struct se_device *dev,
struct se_node_acl *nacl,
unsigned char *isid)
{
struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
struct t10_pr_registration *pr_reg, *pr_reg_tmp;
struct se_portal_group *tpg;
spin_lock(&pr_tmpl->registration_lock);
list_for_each_entry_safe(pr_reg, pr_reg_tmp,
&pr_tmpl->registration_list, pr_reg_list) {
/*
* First look for a matching struct se_node_acl
*/
if (pr_reg->pr_reg_nacl != nacl)
continue;
tpg = pr_reg->pr_reg_nacl->se_tpg;
/*
* If this registration does NOT contain a fabric provided
* ISID, then we have found a match.
*/
if (!pr_reg->isid_present_at_reg) {
/*
* Determine if this SCSI device server requires that
* SCSI Intiatior TransportID w/ ISIDs is enforced
* for fabric modules (iSCSI) requiring them.
*/
if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
if (dev->se_sub_dev->se_dev_attrib.enforce_pr_isids)
continue;
}
atomic_inc(&pr_reg->pr_res_holders);
smp_mb__after_atomic_inc();
spin_unlock(&pr_tmpl->registration_lock);
return pr_reg;
}
/*
* If the *pr_reg contains a fabric defined ISID for multi-value
* SCSI Initiator Port TransportIDs, then we expect a valid
* matching ISID to be provided by the local SCSI Initiator Port.
*/
if (!isid)
continue;
if (strcmp(isid, pr_reg->pr_reg_isid))
continue;
atomic_inc(&pr_reg->pr_res_holders);
smp_mb__after_atomic_inc();
spin_unlock(&pr_tmpl->registration_lock);
return pr_reg;
}
spin_unlock(&pr_tmpl->registration_lock);
return NULL;
}
static struct t10_pr_registration *core_scsi3_locate_pr_reg(
struct se_device *dev,
struct se_node_acl *nacl,
struct se_session *sess)
{
struct se_portal_group *tpg = nacl->se_tpg;
unsigned char buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
if (tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
memset(&buf[0], 0, PR_REG_ISID_LEN);
tpg->se_tpg_tfo->sess_get_initiator_sid(sess, &buf[0],
PR_REG_ISID_LEN);
isid_ptr = &buf[0];
}
return __core_scsi3_locate_pr_reg(dev, nacl, isid_ptr);
}
static void core_scsi3_put_pr_reg(struct t10_pr_registration *pr_reg)
{
atomic_dec(&pr_reg->pr_res_holders);
smp_mb__after_atomic_dec();
}
static int core_scsi3_check_implict_release(
struct se_device *dev,
struct t10_pr_registration *pr_reg)
{
struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
struct t10_pr_registration *pr_res_holder;
int ret = 0;
spin_lock(&dev->dev_reservation_lock);
pr_res_holder = dev->dev_pr_res_holder;
if (!pr_res_holder) {
spin_unlock(&dev->dev_reservation_lock);
return ret;
}
if (pr_res_holder == pr_reg) {
/*
* Perform an implict RELEASE if the registration that
* is being released is holding the reservation.
*
* From spc4r17, section 5.7.11.1:
*
* e) If the I_T nexus is the persistent reservation holder
* and the persistent reservation is not an all registrants
* type, then a PERSISTENT RESERVE OUT command with REGISTER
* service action or REGISTER AND IGNORE EXISTING KEY
* service action with the SERVICE ACTION RESERVATION KEY
* field set to zero (see 5.7.11.3).
*/
__core_scsi3_complete_pro_release(dev, nacl, pr_reg, 0);
ret = 1;
/*
* For 'All Registrants' reservation types, all existing
* registrations are still processed as reservation holders
* in core_scsi3_pr_seq_non_holder() after the initial
* reservation holder is implictly released here.
*/
} else if (pr_reg->pr_reg_all_tg_pt &&
(!strcmp(pr_res_holder->pr_reg_nacl->initiatorname,
pr_reg->pr_reg_nacl->initiatorname)) &&
(pr_res_holder->pr_res_key == pr_reg->pr_res_key)) {
pr_err("SPC-3 PR: Unable to perform ALL_TG_PT=1"
" UNREGISTER while existing reservation with matching"
" key 0x%016Lx is present from another SCSI Initiator"
" Port\n", pr_reg->pr_res_key);
ret = -EPERM;
}
spin_unlock(&dev->dev_reservation_lock);
return ret;
}
/*
* Called with struct t10_reservation->registration_lock held.
*/
static void __core_scsi3_free_registration(
struct se_device *dev,
struct t10_pr_registration *pr_reg,
struct list_head *preempt_and_abort_list,
int dec_holders)
{
struct target_core_fabric_ops *tfo =
pr_reg->pr_reg_nacl->se_tpg->se_tpg_tfo;
struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
char i_buf[PR_REG_ISID_ID_LEN];
int prf_isid;
memset(i_buf, 0, PR_REG_ISID_ID_LEN);
prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
PR_REG_ISID_ID_LEN);
pr_reg->pr_reg_deve->def_pr_registered = 0;
pr_reg->pr_reg_deve->pr_res_key = 0;
list_del(&pr_reg->pr_reg_list);
/*
* Caller accessing *pr_reg using core_scsi3_locate_pr_reg(),
* so call core_scsi3_put_pr_reg() to decrement our reference.
*/
if (dec_holders)
core_scsi3_put_pr_reg(pr_reg);
/*
* Wait until all reference from any other I_T nexuses for this
* *pr_reg have been released. Because list_del() is called above,
* the last core_scsi3_put_pr_reg(pr_reg) will release this reference
* count back to zero, and we release *pr_reg.
*/
while (atomic_read(&pr_reg->pr_res_holders) != 0) {
spin_unlock(&pr_tmpl->registration_lock);
pr_debug("SPC-3 PR [%s] waiting for pr_res_holders\n",
tfo->get_fabric_name());
cpu_relax();
spin_lock(&pr_tmpl->registration_lock);
}
pr_debug("SPC-3 PR [%s] Service Action: UNREGISTER Initiator"
" Node: %s%s\n", tfo->get_fabric_name(),
pr_reg->pr_reg_nacl->initiatorname,
(prf_isid) ? &i_buf[0] : "");
pr_debug("SPC-3 PR [%s] for %s TCM Subsystem %s Object Target"
" Port(s)\n", tfo->get_fabric_name(),
(pr_reg->pr_reg_all_tg_pt) ? "ALL" : "SINGLE",
dev->transport->name);
pr_debug("SPC-3 PR [%s] SA Res Key: 0x%016Lx PRgeneration:"
" 0x%08x\n", tfo->get_fabric_name(), pr_reg->pr_res_key,
pr_reg->pr_res_generation);
if (!preempt_and_abort_list) {
pr_reg->pr_reg_deve = NULL;
pr_reg->pr_reg_nacl = NULL;
kfree(pr_reg->pr_aptpl_buf);
kmem_cache_free(t10_pr_reg_cache, pr_reg);
return;
}
/*
* For PREEMPT_AND_ABORT, the list of *pr_reg in preempt_and_abort_list
* are released once the ABORT_TASK_SET has completed..
*/
list_add_tail(&pr_reg->pr_reg_abort_list, preempt_and_abort_list);
}
void core_scsi3_free_pr_reg_from_nacl(
struct se_device *dev,
struct se_node_acl *nacl)
{
struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
/*
* If the passed se_node_acl matches the reservation holder,
* release the reservation.
*/
spin_lock(&dev->dev_reservation_lock);
pr_res_holder = dev->dev_pr_res_holder;
if ((pr_res_holder != NULL) &&
(pr_res_holder->pr_reg_nacl == nacl))
__core_scsi3_complete_pro_release(dev, nacl, pr_res_holder, 0);
spin_unlock(&dev->dev_reservation_lock);
/*
* Release any registration associated with the struct se_node_acl.
*/
spin_lock(&pr_tmpl->registration_lock);
list_for_each_entry_safe(pr_reg, pr_reg_tmp,
&pr_tmpl->registration_list, pr_reg_list) {
if (pr_reg->pr_reg_nacl != nacl)
continue;
__core_scsi3_free_registration(dev, pr_reg, NULL, 0);
}
spin_unlock(&pr_tmpl->registration_lock);
}
void core_scsi3_free_all_registrations(
struct se_device *dev)
{
struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_res_holder;
spin_lock(&dev->dev_reservation_lock);
pr_res_holder = dev->dev_pr_res_holder;
if (pr_res_holder != NULL) {
struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
__core_scsi3_complete_pro_release(dev, pr_res_nacl,
pr_res_holder, 0);
}
spin_unlock(&dev->dev_reservation_lock);
spin_lock(&pr_tmpl->registration_lock);
list_for_each_entry_safe(pr_reg, pr_reg_tmp,
&pr_tmpl->registration_list, pr_reg_list) {
__core_scsi3_free_registration(dev, pr_reg, NULL, 0);
}
spin_unlock(&pr_tmpl->registration_lock);
spin_lock(&pr_tmpl->aptpl_reg_lock);
list_for_each_entry_safe(pr_reg, pr_reg_tmp, &pr_tmpl->aptpl_reg_list,
pr_reg_aptpl_list) {
list_del(&pr_reg->pr_reg_aptpl_list);
kfree(pr_reg->pr_aptpl_buf);
kmem_cache_free(t10_pr_reg_cache, pr_reg);
}
spin_unlock(&pr_tmpl->aptpl_reg_lock);
}
static int core_scsi3_tpg_depend_item(struct se_portal_group *tpg)
{
return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
&tpg->tpg_group.cg_item);
}
static void core_scsi3_tpg_undepend_item(struct se_portal_group *tpg)
{
configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
&tpg->tpg_group.cg_item);
atomic_dec(&tpg->tpg_pr_ref_count);
smp_mb__after_atomic_dec();
}
static int core_scsi3_nodeacl_depend_item(struct se_node_acl *nacl)
{
struct se_portal_group *tpg = nacl->se_tpg;
if (nacl->dynamic_node_acl)
return 0;
return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
&nacl->acl_group.cg_item);
}
static void core_scsi3_nodeacl_undepend_item(struct se_node_acl *nacl)
{
struct se_portal_group *tpg = nacl->se_tpg;
if (nacl->dynamic_node_acl) {
atomic_dec(&nacl->acl_pr_ref_count);
smp_mb__after_atomic_dec();
return;
}
configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
&nacl->acl_group.cg_item);
atomic_dec(&nacl->acl_pr_ref_count);
smp_mb__after_atomic_dec();
}
static int core_scsi3_lunacl_depend_item(struct se_dev_entry *se_deve)
{
struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
struct se_node_acl *nacl;
struct se_portal_group *tpg;
/*
* For nacl->dynamic_node_acl=1
*/
if (!lun_acl)
return 0;
nacl = lun_acl->se_lun_nacl;
tpg = nacl->se_tpg;
return configfs_depend_item(tpg->se_tpg_tfo->tf_subsys,
&lun_acl->se_lun_group.cg_item);
}
static void core_scsi3_lunacl_undepend_item(struct se_dev_entry *se_deve)
{
struct se_lun_acl *lun_acl = se_deve->se_lun_acl;
struct se_node_acl *nacl;
struct se_portal_group *tpg;
/*
* For nacl->dynamic_node_acl=1
*/
if (!lun_acl) {
atomic_dec(&se_deve->pr_ref_count);
smp_mb__after_atomic_dec();
return;
}
nacl = lun_acl->se_lun_nacl;
tpg = nacl->se_tpg;
configfs_undepend_item(tpg->se_tpg_tfo->tf_subsys,
&lun_acl->se_lun_group.cg_item);
atomic_dec(&se_deve->pr_ref_count);
smp_mb__after_atomic_dec();
}
static int core_scsi3_decode_spec_i_port(
struct se_cmd *cmd,
struct se_portal_group *tpg,
unsigned char *l_isid,
u64 sa_res_key,
int all_tg_pt,
int aptpl)
{
struct se_device *dev = cmd->se_dev;
struct se_port *tmp_port;
struct se_portal_group *dest_tpg = NULL, *tmp_tpg;
struct se_session *se_sess = cmd->se_sess;
struct se_node_acl *dest_node_acl = NULL;
struct se_dev_entry *dest_se_deve = NULL, *local_se_deve;
struct t10_pr_registration *dest_pr_reg, *local_pr_reg, *pr_reg_e;
struct t10_pr_registration *pr_reg_tmp, *pr_reg_tmp_safe;
LIST_HEAD(tid_dest_list);
struct pr_transport_id_holder *tidh_new, *tidh, *tidh_tmp;
struct target_core_fabric_ops *tmp_tf_ops;
unsigned char *buf;
unsigned char *ptr, *i_str = NULL, proto_ident, tmp_proto_ident;
char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
u32 tpdl, tid_len = 0;
int ret, dest_local_nexus, prf_isid;
u32 dest_rtpi = 0;
memset(dest_iport, 0, 64);
local_se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
/*
* Allocate a struct pr_transport_id_holder and setup the
* local_node_acl and local_se_deve pointers and add to
* struct list_head tid_dest_list for add registration
* processing in the loop of tid_dest_list below.
*/
tidh_new = kzalloc(sizeof(struct pr_transport_id_holder), GFP_KERNEL);
if (!tidh_new) {
pr_err("Unable to allocate tidh_new\n");
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -EINVAL;
}
INIT_LIST_HEAD(&tidh_new->dest_list);
tidh_new->dest_tpg = tpg;
tidh_new->dest_node_acl = se_sess->se_node_acl;
tidh_new->dest_se_deve = local_se_deve;
local_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
se_sess->se_node_acl, local_se_deve, l_isid,
sa_res_key, all_tg_pt, aptpl);
if (!local_pr_reg) {
kfree(tidh_new);
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -ENOMEM;
}
tidh_new->dest_pr_reg = local_pr_reg;
/*
* The local I_T nexus does not hold any configfs dependances,
* so we set tid_h->dest_local_nexus=1 to prevent the
* configfs_undepend_item() calls in the tid_dest_list loops below.
*/
tidh_new->dest_local_nexus = 1;
list_add_tail(&tidh_new->dest_list, &tid_dest_list);
buf = transport_kmap_data_sg(cmd);
/*
* For a PERSISTENT RESERVE OUT specify initiator ports payload,
* first extract TransportID Parameter Data Length, and make sure
* the value matches up to the SCSI expected data transfer length.
*/
tpdl = (buf[24] & 0xff) << 24;
tpdl |= (buf[25] & 0xff) << 16;
tpdl |= (buf[26] & 0xff) << 8;
tpdl |= buf[27] & 0xff;
if ((tpdl + 28) != cmd->data_length) {
pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
" does not equal CDB data_length: %u\n", tpdl,
cmd->data_length);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
/*
* Start processing the received transport IDs using the
* receiving I_T Nexus portal's fabric dependent methods to
* obtain the SCSI Initiator Port/Device Identifiers.
*/
ptr = &buf[28];
while (tpdl > 0) {
proto_ident = (ptr[0] & 0x0f);
dest_tpg = NULL;
spin_lock(&dev->se_port_lock);
list_for_each_entry(tmp_port, &dev->dev_sep_list, sep_list) {
tmp_tpg = tmp_port->sep_tpg;
if (!tmp_tpg)
continue;
tmp_tf_ops = tmp_tpg->se_tpg_tfo;
if (!tmp_tf_ops)
continue;
if (!tmp_tf_ops->get_fabric_proto_ident ||
!tmp_tf_ops->tpg_parse_pr_out_transport_id)
continue;
/*
* Look for the matching proto_ident provided by
* the received TransportID
*/
tmp_proto_ident = tmp_tf_ops->get_fabric_proto_ident(tmp_tpg);
if (tmp_proto_ident != proto_ident)
continue;
dest_rtpi = tmp_port->sep_rtpi;
i_str = tmp_tf_ops->tpg_parse_pr_out_transport_id(
tmp_tpg, (const char *)ptr, &tid_len,
&iport_ptr);
if (!i_str)
continue;
atomic_inc(&tmp_tpg->tpg_pr_ref_count);
smp_mb__after_atomic_inc();
spin_unlock(&dev->se_port_lock);
ret = core_scsi3_tpg_depend_item(tmp_tpg);
if (ret != 0) {
pr_err(" core_scsi3_tpg_depend_item()"
" for tmp_tpg\n");
atomic_dec(&tmp_tpg->tpg_pr_ref_count);
smp_mb__after_atomic_dec();
cmd->scsi_sense_reason =
TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
ret = -EINVAL;
goto out;
}
/*
* Locate the desination initiator ACL to be registered
* from the decoded fabric module specific TransportID
* at *i_str.
*/
spin_lock_irq(&tmp_tpg->acl_node_lock);
dest_node_acl = __core_tpg_get_initiator_node_acl(
tmp_tpg, i_str);
if (dest_node_acl) {
atomic_inc(&dest_node_acl->acl_pr_ref_count);
smp_mb__after_atomic_inc();
}
spin_unlock_irq(&tmp_tpg->acl_node_lock);
if (!dest_node_acl) {
core_scsi3_tpg_undepend_item(tmp_tpg);
spin_lock(&dev->se_port_lock);
continue;
}
ret = core_scsi3_nodeacl_depend_item(dest_node_acl);
if (ret != 0) {
pr_err("configfs_depend_item() failed"
" for dest_node_acl->acl_group\n");
atomic_dec(&dest_node_acl->acl_pr_ref_count);
smp_mb__after_atomic_dec();
core_scsi3_tpg_undepend_item(tmp_tpg);
cmd->scsi_sense_reason =
TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
ret = -EINVAL;
goto out;
}
dest_tpg = tmp_tpg;
pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node:"
" %s Port RTPI: %hu\n",
dest_tpg->se_tpg_tfo->get_fabric_name(),
dest_node_acl->initiatorname, dest_rtpi);
spin_lock(&dev->se_port_lock);
break;
}
spin_unlock(&dev->se_port_lock);
if (!dest_tpg) {
pr_err("SPC-3 PR SPEC_I_PT: Unable to locate"
" dest_tpg\n");
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
pr_debug("SPC-3 PR SPEC_I_PT: Got %s data_length: %u tpdl: %u"
" tid_len: %d for %s + %s\n",
dest_tpg->se_tpg_tfo->get_fabric_name(), cmd->data_length,
tpdl, tid_len, i_str, iport_ptr);
if (tid_len > tpdl) {
pr_err("SPC-3 PR SPEC_I_PT: Illegal tid_len:"
" %u for Transport ID: %s\n", tid_len, ptr);
core_scsi3_nodeacl_undepend_item(dest_node_acl);
core_scsi3_tpg_undepend_item(dest_tpg);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
/*
* Locate the desintation struct se_dev_entry pointer for matching
* RELATIVE TARGET PORT IDENTIFIER on the receiving I_T Nexus
* Target Port.
*/
dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl,
dest_rtpi);
if (!dest_se_deve) {
pr_err("Unable to locate %s dest_se_deve"
" from destination RTPI: %hu\n",
dest_tpg->se_tpg_tfo->get_fabric_name(),
dest_rtpi);
core_scsi3_nodeacl_undepend_item(dest_node_acl);
core_scsi3_tpg_undepend_item(dest_tpg);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
ret = core_scsi3_lunacl_depend_item(dest_se_deve);
if (ret < 0) {
pr_err("core_scsi3_lunacl_depend_item()"
" failed\n");
atomic_dec(&dest_se_deve->pr_ref_count);
smp_mb__after_atomic_dec();
core_scsi3_nodeacl_undepend_item(dest_node_acl);
core_scsi3_tpg_undepend_item(dest_tpg);
cmd->scsi_sense_reason =
TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
ret = -EINVAL;
goto out;
}
pr_debug("SPC-3 PR SPEC_I_PT: Located %s Node: %s"
" dest_se_deve mapped_lun: %u\n",
dest_tpg->se_tpg_tfo->get_fabric_name(),
dest_node_acl->initiatorname, dest_se_deve->mapped_lun);
/*
* Skip any TransportIDs that already have a registration for
* this target port.
*/
pr_reg_e = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
iport_ptr);
if (pr_reg_e) {
core_scsi3_put_pr_reg(pr_reg_e);
core_scsi3_lunacl_undepend_item(dest_se_deve);
core_scsi3_nodeacl_undepend_item(dest_node_acl);
core_scsi3_tpg_undepend_item(dest_tpg);
ptr += tid_len;
tpdl -= tid_len;
tid_len = 0;
continue;
}
/*
* Allocate a struct pr_transport_id_holder and setup
* the dest_node_acl and dest_se_deve pointers for the
* loop below.
*/
tidh_new = kzalloc(sizeof(struct pr_transport_id_holder),
GFP_KERNEL);
if (!tidh_new) {
pr_err("Unable to allocate tidh_new\n");
core_scsi3_lunacl_undepend_item(dest_se_deve);
core_scsi3_nodeacl_undepend_item(dest_node_acl);
core_scsi3_tpg_undepend_item(dest_tpg);
cmd->scsi_sense_reason =
TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
ret = -ENOMEM;
goto out;
}
INIT_LIST_HEAD(&tidh_new->dest_list);
tidh_new->dest_tpg = dest_tpg;
tidh_new->dest_node_acl = dest_node_acl;
tidh_new->dest_se_deve = dest_se_deve;
/*
* Allocate, but do NOT add the registration for the
* TransportID referenced SCSI Initiator port. This
* done because of the following from spc4r17 in section
* 6.14.3 wrt SPEC_I_PT:
*
* "If a registration fails for any initiator port (e.g., if th
* logical unit does not have enough resources available to
* hold the registration information), no registrations shall be
* made, and the command shall be terminated with
* CHECK CONDITION status."
*
* That means we call __core_scsi3_alloc_registration() here,
* and then call __core_scsi3_add_registration() in the
* 2nd loop which will never fail.
*/
dest_pr_reg = __core_scsi3_alloc_registration(cmd->se_dev,
dest_node_acl, dest_se_deve, iport_ptr,
sa_res_key, all_tg_pt, aptpl);
if (!dest_pr_reg) {
core_scsi3_lunacl_undepend_item(dest_se_deve);
core_scsi3_nodeacl_undepend_item(dest_node_acl);
core_scsi3_tpg_undepend_item(dest_tpg);
kfree(tidh_new);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
tidh_new->dest_pr_reg = dest_pr_reg;
list_add_tail(&tidh_new->dest_list, &tid_dest_list);
ptr += tid_len;
tpdl -= tid_len;
tid_len = 0;
}
transport_kunmap_data_sg(cmd);
/*
* Go ahead and create a registrations from tid_dest_list for the
* SPEC_I_PT provided TransportID for the *tidh referenced dest_node_acl
* and dest_se_deve.
*
* The SA Reservation Key from the PROUT is set for the
* registration, and ALL_TG_PT is also passed. ALL_TG_PT=1
* means that the TransportID Initiator port will be
* registered on all of the target ports in the SCSI target device
* ALL_TG_PT=0 means the registration will only be for the
* SCSI target port the PROUT REGISTER with SPEC_I_PT=1
* was received.
*/
list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
dest_tpg = tidh->dest_tpg;
dest_node_acl = tidh->dest_node_acl;
dest_se_deve = tidh->dest_se_deve;
dest_pr_reg = tidh->dest_pr_reg;
dest_local_nexus = tidh->dest_local_nexus;
list_del(&tidh->dest_list);
kfree(tidh);
memset(i_buf, 0, PR_REG_ISID_ID_LEN);
prf_isid = core_pr_dump_initiator_port(dest_pr_reg, &i_buf[0],
PR_REG_ISID_ID_LEN);
__core_scsi3_add_registration(cmd->se_dev, dest_node_acl,
dest_pr_reg, 0, 0);
pr_debug("SPC-3 PR [%s] SPEC_I_PT: Successfully"
" registered Transport ID for Node: %s%s Mapped LUN:"
" %u\n", dest_tpg->se_tpg_tfo->get_fabric_name(),
dest_node_acl->initiatorname, (prf_isid) ?
&i_buf[0] : "", dest_se_deve->mapped_lun);
if (dest_local_nexus)
continue;
core_scsi3_lunacl_undepend_item(dest_se_deve);
core_scsi3_nodeacl_undepend_item(dest_node_acl);
core_scsi3_tpg_undepend_item(dest_tpg);
}
return 0;
out:
transport_kunmap_data_sg(cmd);
/*
* For the failure case, release everything from tid_dest_list
* including *dest_pr_reg and the configfs dependances..
*/
list_for_each_entry_safe(tidh, tidh_tmp, &tid_dest_list, dest_list) {
dest_tpg = tidh->dest_tpg;
dest_node_acl = tidh->dest_node_acl;
dest_se_deve = tidh->dest_se_deve;
dest_pr_reg = tidh->dest_pr_reg;
dest_local_nexus = tidh->dest_local_nexus;
list_del(&tidh->dest_list);
kfree(tidh);
/*
* Release any extra ALL_TG_PT=1 registrations for
* the SPEC_I_PT=1 case.
*/
list_for_each_entry_safe(pr_reg_tmp, pr_reg_tmp_safe,
&dest_pr_reg->pr_reg_atp_list,
pr_reg_atp_mem_list) {
list_del(&pr_reg_tmp->pr_reg_atp_mem_list);
core_scsi3_lunacl_undepend_item(pr_reg_tmp->pr_reg_deve);
kmem_cache_free(t10_pr_reg_cache, pr_reg_tmp);
}
kfree(dest_pr_reg->pr_aptpl_buf);
kmem_cache_free(t10_pr_reg_cache, dest_pr_reg);
if (dest_local_nexus)
continue;
core_scsi3_lunacl_undepend_item(dest_se_deve);
core_scsi3_nodeacl_undepend_item(dest_node_acl);
core_scsi3_tpg_undepend_item(dest_tpg);
}
return ret;
}
/*
* Called with struct se_device->dev_reservation_lock held
*/
static int __core_scsi3_update_aptpl_buf(
struct se_device *dev,
unsigned char *buf,
u32 pr_aptpl_buf_len,
int clear_aptpl_metadata)
{
struct se_lun *lun;
struct se_portal_group *tpg;
struct se_subsystem_dev *su_dev = dev->se_sub_dev;
struct t10_pr_registration *pr_reg;
unsigned char tmp[512], isid_buf[32];
ssize_t len = 0;
int reg_count = 0;
memset(buf, 0, pr_aptpl_buf_len);
/*
* Called to clear metadata once APTPL has been deactivated.
*/
if (clear_aptpl_metadata) {
snprintf(buf, pr_aptpl_buf_len,
"No Registrations or Reservations\n");
return 0;
}
/*
* Walk the registration list..
*/
spin_lock(&su_dev->t10_pr.registration_lock);
list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list,
pr_reg_list) {
tmp[0] = '\0';
isid_buf[0] = '\0';
tpg = pr_reg->pr_reg_nacl->se_tpg;
lun = pr_reg->pr_reg_tg_pt_lun;
/*
* Write out any ISID value to APTPL metadata that was included
* in the original registration.
*/
if (pr_reg->isid_present_at_reg)
snprintf(isid_buf, 32, "initiator_sid=%s\n",
pr_reg->pr_reg_isid);
/*
* Include special metadata if the pr_reg matches the
* reservation holder.
*/
if (dev->dev_pr_res_holder == pr_reg) {
snprintf(tmp, 512, "PR_REG_START: %d"
"\ninitiator_fabric=%s\n"
"initiator_node=%s\n%s"
"sa_res_key=%llu\n"
"res_holder=1\nres_type=%02x\n"
"res_scope=%02x\nres_all_tg_pt=%d\n"
"mapped_lun=%u\n", reg_count,
tpg->se_tpg_tfo->get_fabric_name(),
pr_reg->pr_reg_nacl->initiatorname, isid_buf,
pr_reg->pr_res_key, pr_reg->pr_res_type,
pr_reg->pr_res_scope, pr_reg->pr_reg_all_tg_pt,
pr_reg->pr_res_mapped_lun);
} else {
snprintf(tmp, 512, "PR_REG_START: %d\n"
"initiator_fabric=%s\ninitiator_node=%s\n%s"
"sa_res_key=%llu\nres_holder=0\n"
"res_all_tg_pt=%d\nmapped_lun=%u\n",
reg_count, tpg->se_tpg_tfo->get_fabric_name(),
pr_reg->pr_reg_nacl->initiatorname, isid_buf,
pr_reg->pr_res_key, pr_reg->pr_reg_all_tg_pt,
pr_reg->pr_res_mapped_lun);
}
if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
pr_err("Unable to update renaming"
" APTPL metadata\n");
spin_unlock(&su_dev->t10_pr.registration_lock);
return -EMSGSIZE;
}
len += sprintf(buf+len, "%s", tmp);
/*
* Include information about the associated SCSI target port.
*/
snprintf(tmp, 512, "target_fabric=%s\ntarget_node=%s\n"
"tpgt=%hu\nport_rtpi=%hu\ntarget_lun=%u\nPR_REG_END:"
" %d\n", tpg->se_tpg_tfo->get_fabric_name(),
tpg->se_tpg_tfo->tpg_get_wwn(tpg),
tpg->se_tpg_tfo->tpg_get_tag(tpg),
lun->lun_sep->sep_rtpi, lun->unpacked_lun, reg_count);
if ((len + strlen(tmp) >= pr_aptpl_buf_len)) {
pr_err("Unable to update renaming"
" APTPL metadata\n");
spin_unlock(&su_dev->t10_pr.registration_lock);
return -EMSGSIZE;
}
len += sprintf(buf+len, "%s", tmp);
reg_count++;
}
spin_unlock(&su_dev->t10_pr.registration_lock);
if (!reg_count)
len += sprintf(buf+len, "No Registrations or Reservations");
return 0;
}
static int core_scsi3_update_aptpl_buf(
struct se_device *dev,
unsigned char *buf,
u32 pr_aptpl_buf_len,
int clear_aptpl_metadata)
{
int ret;
spin_lock(&dev->dev_reservation_lock);
ret = __core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
clear_aptpl_metadata);
spin_unlock(&dev->dev_reservation_lock);
return ret;
}
/*
* Called with struct se_device->aptpl_file_mutex held
*/
static int __core_scsi3_write_aptpl_to_file(
struct se_device *dev,
unsigned char *buf,
u32 pr_aptpl_buf_len)
{
struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
struct file *file;
struct iovec iov[1];
mm_segment_t old_fs;
int flags = O_RDWR | O_CREAT | O_TRUNC;
char path[512];
int ret;
memset(iov, 0, sizeof(struct iovec));
memset(path, 0, 512);
if (strlen(&wwn->unit_serial[0]) >= 512) {
pr_err("WWN value for struct se_device does not fit"
" into path buffer\n");
return -EMSGSIZE;
}
snprintf(path, 512, "/var/target/pr/aptpl_%s", &wwn->unit_serial[0]);
file = filp_open(path, flags, 0600);
if (IS_ERR(file) || !file || !file->f_dentry) {
pr_err("filp_open(%s) for APTPL metadata"
" failed\n", path);
return (PTR_ERR(file) < 0 ? PTR_ERR(file) : -ENOENT);
}
iov[0].iov_base = &buf[0];
if (!pr_aptpl_buf_len)
iov[0].iov_len = (strlen(&buf[0]) + 1); /* Add extra for NULL */
else
iov[0].iov_len = pr_aptpl_buf_len;
old_fs = get_fs();
set_fs(get_ds());
ret = vfs_writev(file, &iov[0], 1, &file->f_pos);
set_fs(old_fs);
if (ret < 0) {
pr_debug("Error writing APTPL metadata file: %s\n", path);
filp_close(file, NULL);
return -EIO;
}
filp_close(file, NULL);
return 0;
}
static int core_scsi3_update_and_write_aptpl(
struct se_device *dev,
unsigned char *in_buf,
u32 in_pr_aptpl_buf_len)
{
unsigned char null_buf[64], *buf;
u32 pr_aptpl_buf_len;
int ret, clear_aptpl_metadata = 0;
/*
* Can be called with a NULL pointer from PROUT service action CLEAR
*/
if (!in_buf) {
memset(null_buf, 0, 64);
buf = &null_buf[0];
/*
* This will clear the APTPL metadata to:
* "No Registrations or Reservations" status
*/
pr_aptpl_buf_len = 64;
clear_aptpl_metadata = 1;
} else {
buf = in_buf;
pr_aptpl_buf_len = in_pr_aptpl_buf_len;
}
ret = core_scsi3_update_aptpl_buf(dev, buf, pr_aptpl_buf_len,
clear_aptpl_metadata);
if (ret != 0)
return ret;
/*
* __core_scsi3_write_aptpl_to_file() will call strlen()
* on the passed buf to determine pr_aptpl_buf_len.
*/
ret = __core_scsi3_write_aptpl_to_file(dev, buf, 0);
if (ret != 0)
return ret;
return ret;
}
static int core_scsi3_emulate_pro_register(
struct se_cmd *cmd,
u64 res_key,
u64 sa_res_key,
int aptpl,
int all_tg_pt,
int spec_i_pt,
int ignore_key)
{
struct se_session *se_sess = cmd->se_sess;
struct se_device *dev = cmd->se_dev;
struct se_dev_entry *se_deve;
struct se_lun *se_lun = cmd->se_lun;
struct se_portal_group *se_tpg;
struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_reg_tmp, *pr_reg_e;
struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
/* Used for APTPL metadata w/ UNREGISTER */
unsigned char *pr_aptpl_buf = NULL;
unsigned char isid_buf[PR_REG_ISID_LEN], *isid_ptr = NULL;
int pr_holder = 0, ret = 0, type;
if (!se_sess || !se_lun) {
pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -EINVAL;
}
se_tpg = se_sess->se_tpg;
se_deve = se_sess->se_node_acl->device_list[cmd->orig_fe_lun];
if (se_tpg->se_tpg_tfo->sess_get_initiator_sid) {
memset(&isid_buf[0], 0, PR_REG_ISID_LEN);
se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess, &isid_buf[0],
PR_REG_ISID_LEN);
isid_ptr = &isid_buf[0];
}
/*
* Follow logic from spc4r17 Section 5.7.7, Register Behaviors Table 47
*/
pr_reg_e = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
if (!pr_reg_e) {
if (res_key) {
pr_warn("SPC-3 PR: Reservation Key non-zero"
" for SA REGISTER, returning CONFLICT\n");
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EINVAL;
}
/*
* Do nothing but return GOOD status.
*/
if (!sa_res_key)
return 0;
if (!spec_i_pt) {
/*
* Perform the Service Action REGISTER on the Initiator
* Port Endpoint that the PRO was received from on the
* Logical Unit of the SCSI device server.
*/
ret = core_scsi3_alloc_registration(cmd->se_dev,
se_sess->se_node_acl, se_deve, isid_ptr,
sa_res_key, all_tg_pt, aptpl,
ignore_key, 0);
if (ret != 0) {
pr_err("Unable to allocate"
" struct t10_pr_registration\n");
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
return -EINVAL;
}
} else {
/*
* Register both the Initiator port that received
* PROUT SA REGISTER + SPEC_I_PT=1 and extract SCSI
* TransportID from Parameter list and loop through
* fabric dependent parameter list while calling
* logic from of core_scsi3_alloc_registration() for
* each TransportID provided SCSI Initiator Port/Device
*/
ret = core_scsi3_decode_spec_i_port(cmd, se_tpg,
isid_ptr, sa_res_key, all_tg_pt, aptpl);
if (ret != 0)
return ret;
}
/*
* Nothing left to do for the APTPL=0 case.
*/
if (!aptpl) {
pr_tmpl->pr_aptpl_active = 0;
core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
" REGISTER\n");
return 0;
}
/*
* Locate the newly allocated local I_T Nexus *pr_reg, and
* update the APTPL metadata information using its
* preallocated *pr_reg->pr_aptpl_buf.
*/
pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev,
se_sess->se_node_acl, se_sess);
ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
&pr_reg->pr_aptpl_buf[0],
pr_tmpl->pr_aptpl_buf_len);
if (!ret) {
pr_tmpl->pr_aptpl_active = 1;
pr_debug("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n");
}
core_scsi3_put_pr_reg(pr_reg);
return ret;
} else {
/*
* Locate the existing *pr_reg via struct se_node_acl pointers
*/
pr_reg = pr_reg_e;
type = pr_reg->pr_res_type;
if (!ignore_key) {
if (res_key != pr_reg->pr_res_key) {
pr_err("SPC-3 PR REGISTER: Received"
" res_key: 0x%016Lx does not match"
" existing SA REGISTER res_key:"
" 0x%016Lx\n", res_key,
pr_reg->pr_res_key);
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EINVAL;
}
}
if (spec_i_pt) {
pr_err("SPC-3 PR UNREGISTER: SPEC_I_PT"
" set while sa_res_key=0\n");
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
return -EINVAL;
}
/*
* An existing ALL_TG_PT=1 registration being released
* must also set ALL_TG_PT=1 in the incoming PROUT.
*/
if (pr_reg->pr_reg_all_tg_pt && !(all_tg_pt)) {
pr_err("SPC-3 PR UNREGISTER: ALL_TG_PT=1"
" registration exists, but ALL_TG_PT=1 bit not"
" present in received PROUT\n");
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
return -EINVAL;
}
/*
* Allocate APTPL metadata buffer used for UNREGISTER ops
*/
if (aptpl) {
pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len,
GFP_KERNEL);
if (!pr_aptpl_buf) {
pr_err("Unable to allocate"
" pr_aptpl_buf\n");
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason =
TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -EINVAL;
}
}
/*
* sa_res_key=0 Unregister Reservation Key for registered I_T
* Nexus sa_res_key=1 Change Reservation Key for registered I_T
* Nexus.
*/
if (!sa_res_key) {
pr_holder = core_scsi3_check_implict_release(
cmd->se_dev, pr_reg);
if (pr_holder < 0) {
kfree(pr_aptpl_buf);
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EINVAL;
}
spin_lock(&pr_tmpl->registration_lock);
/*
* Release all ALL_TG_PT=1 for the matching SCSI Initiator Port
* and matching pr_res_key.
*/
if (pr_reg->pr_reg_all_tg_pt) {
list_for_each_entry_safe(pr_reg_p, pr_reg_tmp,
&pr_tmpl->registration_list,
pr_reg_list) {
if (!pr_reg_p->pr_reg_all_tg_pt)
continue;
if (pr_reg_p->pr_res_key != res_key)
continue;
if (pr_reg == pr_reg_p)
continue;
if (strcmp(pr_reg->pr_reg_nacl->initiatorname,
pr_reg_p->pr_reg_nacl->initiatorname))
continue;
__core_scsi3_free_registration(dev,
pr_reg_p, NULL, 0);
}
}
/*
* Release the calling I_T Nexus registration now..
*/
__core_scsi3_free_registration(cmd->se_dev, pr_reg,
NULL, 1);
/*
* From spc4r17, section 5.7.11.3 Unregistering
*
* If the persistent reservation is a registrants only
* type, the device server shall establish a unit
* attention condition for the initiator port associated
* with every registered I_T nexus except for the I_T
* nexus on which the PERSISTENT RESERVE OUT command was
* received, with the additional sense code set to
* RESERVATIONS RELEASED.
*/
if (pr_holder &&
((type == PR_TYPE_WRITE_EXCLUSIVE_REGONLY) ||
(type == PR_TYPE_EXCLUSIVE_ACCESS_REGONLY))) {
list_for_each_entry(pr_reg_p,
&pr_tmpl->registration_list,
pr_reg_list) {
core_scsi3_ua_allocate(
pr_reg_p->pr_reg_nacl,
pr_reg_p->pr_res_mapped_lun,
0x2A,
ASCQ_2AH_RESERVATIONS_RELEASED);
}
}
spin_unlock(&pr_tmpl->registration_lock);
if (!aptpl) {
pr_tmpl->pr_aptpl_active = 0;
core_scsi3_update_and_write_aptpl(dev, NULL, 0);
pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
" for UNREGISTER\n");
return 0;
}
ret = core_scsi3_update_and_write_aptpl(dev,
&pr_aptpl_buf[0],
pr_tmpl->pr_aptpl_buf_len);
if (!ret) {
pr_tmpl->pr_aptpl_active = 1;
pr_debug("SPC-3 PR: Set APTPL Bit Activated"
" for UNREGISTER\n");
}
kfree(pr_aptpl_buf);
return ret;
} else {
/*
* Increment PRgeneration counter for struct se_device"
* upon a successful REGISTER, see spc4r17 section 6.3.2
* READ_KEYS service action.
*/
pr_reg->pr_res_generation = core_scsi3_pr_generation(
cmd->se_dev);
pr_reg->pr_res_key = sa_res_key;
pr_debug("SPC-3 PR [%s] REGISTER%s: Changed Reservation"
" Key for %s to: 0x%016Lx PRgeneration:"
" 0x%08x\n", cmd->se_tfo->get_fabric_name(),
(ignore_key) ? "_AND_IGNORE_EXISTING_KEY" : "",
pr_reg->pr_reg_nacl->initiatorname,
pr_reg->pr_res_key, pr_reg->pr_res_generation);
if (!aptpl) {
pr_tmpl->pr_aptpl_active = 0;
core_scsi3_update_and_write_aptpl(dev, NULL, 0);
core_scsi3_put_pr_reg(pr_reg);
pr_debug("SPC-3 PR: Set APTPL Bit Deactivated"
" for REGISTER\n");
return 0;
}
ret = core_scsi3_update_and_write_aptpl(dev,
&pr_aptpl_buf[0],
pr_tmpl->pr_aptpl_buf_len);
if (!ret) {
pr_tmpl->pr_aptpl_active = 1;
pr_debug("SPC-3 PR: Set APTPL Bit Activated"
" for REGISTER\n");
}
kfree(pr_aptpl_buf);
core_scsi3_put_pr_reg(pr_reg);
}
}
return 0;
}
unsigned char *core_scsi3_pr_dump_type(int type)
{
switch (type) {
case PR_TYPE_WRITE_EXCLUSIVE:
return "Write Exclusive Access";
case PR_TYPE_EXCLUSIVE_ACCESS:
return "Exclusive Access";
case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
return "Write Exclusive Access, Registrants Only";
case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
return "Exclusive Access, Registrants Only";
case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
return "Write Exclusive Access, All Registrants";
case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
return "Exclusive Access, All Registrants";
default:
break;
}
return "Unknown SPC-3 PR Type";
}
static int core_scsi3_pro_reserve(
struct se_cmd *cmd,
struct se_device *dev,
int type,
int scope,
u64 res_key)
{
struct se_session *se_sess = cmd->se_sess;
struct se_lun *se_lun = cmd->se_lun;
struct t10_pr_registration *pr_reg, *pr_res_holder;
struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
char i_buf[PR_REG_ISID_ID_LEN];
int ret, prf_isid;
memset(i_buf, 0, PR_REG_ISID_ID_LEN);
if (!se_sess || !se_lun) {
pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -EINVAL;
}
/*
* Locate the existing *pr_reg via struct se_node_acl pointers
*/
pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
se_sess);
if (!pr_reg) {
pr_err("SPC-3 PR: Unable to locate"
" PR_REGISTERED *pr_reg for RESERVE\n");
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -EINVAL;
}
/*
* From spc4r17 Section 5.7.9: Reserving:
*
* An application client creates a persistent reservation by issuing
* a PERSISTENT RESERVE OUT command with RESERVE service action through
* a registered I_T nexus with the following parameters:
* a) RESERVATION KEY set to the value of the reservation key that is
* registered with the logical unit for the I_T nexus; and
*/
if (res_key != pr_reg->pr_res_key) {
pr_err("SPC-3 PR RESERVE: Received res_key: 0x%016Lx"
" does not match existing SA REGISTER res_key:"
" 0x%016Lx\n", res_key, pr_reg->pr_res_key);
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EINVAL;
}
/*
* From spc4r17 Section 5.7.9: Reserving:
*
* From above:
* b) TYPE field and SCOPE field set to the persistent reservation
* being created.
*
* Only one persistent reservation is allowed at a time per logical unit
* and that persistent reservation has a scope of LU_SCOPE.
*/
if (scope != PR_SCOPE_LU_SCOPE) {
pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
return -EINVAL;
}
/*
* See if we have an existing PR reservation holder pointer at
* struct se_device->dev_pr_res_holder in the form struct t10_pr_registration
* *pr_res_holder.
*/
spin_lock(&dev->dev_reservation_lock);
pr_res_holder = dev->dev_pr_res_holder;
if ((pr_res_holder)) {
/*
* From spc4r17 Section 5.7.9: Reserving:
*
* If the device server receives a PERSISTENT RESERVE OUT
* command from an I_T nexus other than a persistent reservation
* holder (see 5.7.10) that attempts to create a persistent
* reservation when a persistent reservation already exists for
* the logical unit, then the command shall be completed with
* RESERVATION CONFLICT status.
*/
if (pr_res_holder != pr_reg) {
struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
pr_err("SPC-3 PR: Attempted RESERVE from"
" [%s]: %s while reservation already held by"
" [%s]: %s, returning RESERVATION_CONFLICT\n",
cmd->se_tfo->get_fabric_name(),
se_sess->se_node_acl->initiatorname,
pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
pr_res_holder->pr_reg_nacl->initiatorname);
spin_unlock(&dev->dev_reservation_lock);
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EINVAL;
}
/*
* From spc4r17 Section 5.7.9: Reserving:
*
* If a persistent reservation holder attempts to modify the
* type or scope of an existing persistent reservation, the
* command shall be completed with RESERVATION CONFLICT status.
*/
if ((pr_res_holder->pr_res_type != type) ||
(pr_res_holder->pr_res_scope != scope)) {
struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
pr_err("SPC-3 PR: Attempted RESERVE from"
" [%s]: %s trying to change TYPE and/or SCOPE,"
" while reservation already held by [%s]: %s,"
" returning RESERVATION_CONFLICT\n",
cmd->se_tfo->get_fabric_name(),
se_sess->se_node_acl->initiatorname,
pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
pr_res_holder->pr_reg_nacl->initiatorname);
spin_unlock(&dev->dev_reservation_lock);
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EINVAL;
}
/*
* From spc4r17 Section 5.7.9: Reserving:
*
* If the device server receives a PERSISTENT RESERVE OUT
* command with RESERVE service action where the TYPE field and
* the SCOPE field contain the same values as the existing type
* and scope from a persistent reservation holder, it shall not
* make any change to the existing persistent reservation and
* shall completethe command with GOOD status.
*/
spin_unlock(&dev->dev_reservation_lock);
core_scsi3_put_pr_reg(pr_reg);
return 0;
}
/*
* Otherwise, our *pr_reg becomes the PR reservation holder for said
* TYPE/SCOPE. Also set the received scope and type in *pr_reg.
*/
pr_reg->pr_res_scope = scope;
pr_reg->pr_res_type = type;
pr_reg->pr_res_holder = 1;
dev->dev_pr_res_holder = pr_reg;
prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
PR_REG_ISID_ID_LEN);
pr_debug("SPC-3 PR [%s] Service Action: RESERVE created new"
" reservation holder TYPE: %s ALL_TG_PT: %d\n",
cmd->se_tfo->get_fabric_name(), core_scsi3_pr_dump_type(type),
(pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
pr_debug("SPC-3 PR [%s] RESERVE Node: %s%s\n",
cmd->se_tfo->get_fabric_name(),
se_sess->se_node_acl->initiatorname,
(prf_isid) ? &i_buf[0] : "");
spin_unlock(&dev->dev_reservation_lock);
if (pr_tmpl->pr_aptpl_active) {
ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
&pr_reg->pr_aptpl_buf[0],
pr_tmpl->pr_aptpl_buf_len);
if (!ret)
pr_debug("SPC-3 PR: Updated APTPL metadata"
" for RESERVE\n");
}
core_scsi3_put_pr_reg(pr_reg);
return 0;
}
static int core_scsi3_emulate_pro_reserve(
struct se_cmd *cmd,
int type,
int scope,
u64 res_key)
{
struct se_device *dev = cmd->se_dev;
int ret = 0;
switch (type) {
case PR_TYPE_WRITE_EXCLUSIVE:
case PR_TYPE_EXCLUSIVE_ACCESS:
case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
ret = core_scsi3_pro_reserve(cmd, dev, type, scope, res_key);
break;
default:
pr_err("SPC-3 PR: Unknown Service Action RESERVE Type:"
" 0x%02x\n", type);
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
return -EINVAL;
}
return ret;
}
/*
* Called with struct se_device->dev_reservation_lock held.
*/
static void __core_scsi3_complete_pro_release(
struct se_device *dev,
struct se_node_acl *se_nacl,
struct t10_pr_registration *pr_reg,
int explict)
{
struct target_core_fabric_ops *tfo = se_nacl->se_tpg->se_tpg_tfo;
char i_buf[PR_REG_ISID_ID_LEN];
int prf_isid;
memset(i_buf, 0, PR_REG_ISID_ID_LEN);
prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
PR_REG_ISID_ID_LEN);
/*
* Go ahead and release the current PR reservation holder.
*/
dev->dev_pr_res_holder = NULL;
pr_debug("SPC-3 PR [%s] Service Action: %s RELEASE cleared"
" reservation holder TYPE: %s ALL_TG_PT: %d\n",
tfo->get_fabric_name(), (explict) ? "explict" : "implict",
core_scsi3_pr_dump_type(pr_reg->pr_res_type),
(pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
pr_debug("SPC-3 PR [%s] RELEASE Node: %s%s\n",
tfo->get_fabric_name(), se_nacl->initiatorname,
(prf_isid) ? &i_buf[0] : "");
/*
* Clear TYPE and SCOPE for the next PROUT Service Action: RESERVE
*/
pr_reg->pr_res_holder = pr_reg->pr_res_type = pr_reg->pr_res_scope = 0;
}
static int core_scsi3_emulate_pro_release(
struct se_cmd *cmd,
int type,
int scope,
u64 res_key)
{
struct se_device *dev = cmd->se_dev;
struct se_session *se_sess = cmd->se_sess;
struct se_lun *se_lun = cmd->se_lun;
struct t10_pr_registration *pr_reg, *pr_reg_p, *pr_res_holder;
struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
int ret, all_reg = 0;
if (!se_sess || !se_lun) {
pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -EINVAL;
}
/*
* Locate the existing *pr_reg via struct se_node_acl pointers
*/
pr_reg = core_scsi3_locate_pr_reg(dev, se_sess->se_node_acl, se_sess);
if (!pr_reg) {
pr_err("SPC-3 PR: Unable to locate"
" PR_REGISTERED *pr_reg for RELEASE\n");
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -EINVAL;
}
/*
* From spc4r17 Section 5.7.11.2 Releasing:
*
* If there is no persistent reservation or in response to a persistent
* reservation release request from a registered I_T nexus that is not a
* persistent reservation holder (see 5.7.10), the device server shall
* do the following:
*
* a) Not release the persistent reservation, if any;
* b) Not remove any registrations; and
* c) Complete the command with GOOD status.
*/
spin_lock(&dev->dev_reservation_lock);
pr_res_holder = dev->dev_pr_res_holder;
if (!pr_res_holder) {
/*
* No persistent reservation, return GOOD status.
*/
spin_unlock(&dev->dev_reservation_lock);
core_scsi3_put_pr_reg(pr_reg);
return 0;
}
if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
(pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
all_reg = 1;
if ((all_reg == 0) && (pr_res_holder != pr_reg)) {
/*
* Non 'All Registrants' PR Type cases..
* Release request from a registered I_T nexus that is not a
* persistent reservation holder. return GOOD status.
*/
spin_unlock(&dev->dev_reservation_lock);
core_scsi3_put_pr_reg(pr_reg);
return 0;
}
/*
* From spc4r17 Section 5.7.11.2 Releasing:
*
* Only the persistent reservation holder (see 5.7.10) is allowed to
* release a persistent reservation.
*
* An application client releases the persistent reservation by issuing
* a PERSISTENT RESERVE OUT command with RELEASE service action through
* an I_T nexus that is a persistent reservation holder with the
* following parameters:
*
* a) RESERVATION KEY field set to the value of the reservation key
* that is registered with the logical unit for the I_T nexus;
*/
if (res_key != pr_reg->pr_res_key) {
pr_err("SPC-3 PR RELEASE: Received res_key: 0x%016Lx"
" does not match existing SA REGISTER res_key:"
" 0x%016Lx\n", res_key, pr_reg->pr_res_key);
spin_unlock(&dev->dev_reservation_lock);
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EINVAL;
}
/*
* From spc4r17 Section 5.7.11.2 Releasing and above:
*
* b) TYPE field and SCOPE field set to match the persistent
* reservation being released.
*/
if ((pr_res_holder->pr_res_type != type) ||
(pr_res_holder->pr_res_scope != scope)) {
struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
pr_err("SPC-3 PR RELEASE: Attempted to release"
" reservation from [%s]: %s with different TYPE "
"and/or SCOPE while reservation already held by"
" [%s]: %s, returning RESERVATION_CONFLICT\n",
cmd->se_tfo->get_fabric_name(),
se_sess->se_node_acl->initiatorname,
pr_res_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),
pr_res_holder->pr_reg_nacl->initiatorname);
spin_unlock(&dev->dev_reservation_lock);
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EINVAL;
}
/*
* In response to a persistent reservation release request from the
* persistent reservation holder the device server shall perform a
* release by doing the following as an uninterrupted series of actions:
* a) Release the persistent reservation;
* b) Not remove any registration(s);
* c) If the released persistent reservation is a registrants only type
* or all registrants type persistent reservation,
* the device server shall establish a unit attention condition for
* the initiator port associated with every regis-
* tered I_T nexus other than I_T nexus on which the PERSISTENT
* RESERVE OUT command with RELEASE service action was received,
* with the additional sense code set to RESERVATIONS RELEASED; and
* d) If the persistent reservation is of any other type, the device
* server shall not establish a unit attention condition.
*/
__core_scsi3_complete_pro_release(dev, se_sess->se_node_acl,
pr_reg, 1);
spin_unlock(&dev->dev_reservation_lock);
if ((type != PR_TYPE_WRITE_EXCLUSIVE_REGONLY) &&
(type != PR_TYPE_EXCLUSIVE_ACCESS_REGONLY) &&
(type != PR_TYPE_WRITE_EXCLUSIVE_ALLREG) &&
(type != PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
/*
* If no UNIT ATTENTION conditions will be established for
* PR_TYPE_WRITE_EXCLUSIVE or PR_TYPE_EXCLUSIVE_ACCESS
* go ahead and check for APTPL=1 update+write below
*/
goto write_aptpl;
}
spin_lock(&pr_tmpl->registration_lock);
list_for_each_entry(pr_reg_p, &pr_tmpl->registration_list,
pr_reg_list) {
/*
* Do not establish a UNIT ATTENTION condition
* for the calling I_T Nexus
*/
if (pr_reg_p == pr_reg)
continue;
core_scsi3_ua_allocate(pr_reg_p->pr_reg_nacl,
pr_reg_p->pr_res_mapped_lun,
0x2A, ASCQ_2AH_RESERVATIONS_RELEASED);
}
spin_unlock(&pr_tmpl->registration_lock);
write_aptpl:
if (pr_tmpl->pr_aptpl_active) {
ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
&pr_reg->pr_aptpl_buf[0],
pr_tmpl->pr_aptpl_buf_len);
if (!ret)
pr_debug("SPC-3 PR: Updated APTPL metadata for RELEASE\n");
}
core_scsi3_put_pr_reg(pr_reg);
return 0;
}
static int core_scsi3_emulate_pro_clear(
struct se_cmd *cmd,
u64 res_key)
{
struct se_device *dev = cmd->se_dev;
struct se_node_acl *pr_reg_nacl;
struct se_session *se_sess = cmd->se_sess;
struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
u32 pr_res_mapped_lun = 0;
int calling_it_nexus = 0;
/*
* Locate the existing *pr_reg via struct se_node_acl pointers
*/
pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev,
se_sess->se_node_acl, se_sess);
if (!pr_reg_n) {
pr_err("SPC-3 PR: Unable to locate"
" PR_REGISTERED *pr_reg for CLEAR\n");
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -EINVAL;
}
/*
* From spc4r17 section 5.7.11.6, Clearing:
*
* Any application client may release the persistent reservation and
* remove all registrations from a device server by issuing a
* PERSISTENT RESERVE OUT command with CLEAR service action through a
* registered I_T nexus with the following parameter:
*
* a) RESERVATION KEY field set to the value of the reservation key
* that is registered with the logical unit for the I_T nexus.
*/
if (res_key != pr_reg_n->pr_res_key) {
pr_err("SPC-3 PR REGISTER: Received"
" res_key: 0x%016Lx does not match"
" existing SA REGISTER res_key:"
" 0x%016Lx\n", res_key, pr_reg_n->pr_res_key);
core_scsi3_put_pr_reg(pr_reg_n);
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EINVAL;
}
/*
* a) Release the persistent reservation, if any;
*/
spin_lock(&dev->dev_reservation_lock);
pr_res_holder = dev->dev_pr_res_holder;
if (pr_res_holder) {
struct se_node_acl *pr_res_nacl = pr_res_holder->pr_reg_nacl;
__core_scsi3_complete_pro_release(dev, pr_res_nacl,
pr_res_holder, 0);
}
spin_unlock(&dev->dev_reservation_lock);
/*
* b) Remove all registration(s) (see spc4r17 5.7.7);
*/
spin_lock(&pr_tmpl->registration_lock);
list_for_each_entry_safe(pr_reg, pr_reg_tmp,
&pr_tmpl->registration_list, pr_reg_list) {
calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
pr_reg_nacl = pr_reg->pr_reg_nacl;
pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
__core_scsi3_free_registration(dev, pr_reg, NULL,
calling_it_nexus);
/*
* e) Establish a unit attention condition for the initiator
* port associated with every registered I_T nexus other
* than the I_T nexus on which the PERSISTENT RESERVE OUT
* command with CLEAR service action was received, with the
* additional sense code set to RESERVATIONS PREEMPTED.
*/
if (!calling_it_nexus)
core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun,
0x2A, ASCQ_2AH_RESERVATIONS_PREEMPTED);
}
spin_unlock(&pr_tmpl->registration_lock);
pr_debug("SPC-3 PR [%s] Service Action: CLEAR complete\n",
cmd->se_tfo->get_fabric_name());
if (pr_tmpl->pr_aptpl_active) {
core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
pr_debug("SPC-3 PR: Updated APTPL metadata"
" for CLEAR\n");
}
core_scsi3_pr_generation(dev);
return 0;
}
/*
* Called with struct se_device->dev_reservation_lock held.
*/
static void __core_scsi3_complete_pro_preempt(
struct se_device *dev,
struct t10_pr_registration *pr_reg,
struct list_head *preempt_and_abort_list,
int type,
int scope,
int abort)
{
struct se_node_acl *nacl = pr_reg->pr_reg_nacl;
struct target_core_fabric_ops *tfo = nacl->se_tpg->se_tpg_tfo;
char i_buf[PR_REG_ISID_ID_LEN];
int prf_isid;
memset(i_buf, 0, PR_REG_ISID_ID_LEN);
prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
PR_REG_ISID_ID_LEN);
/*
* Do an implict RELEASE of the existing reservation.
*/
if (dev->dev_pr_res_holder)
__core_scsi3_complete_pro_release(dev, nacl,
dev->dev_pr_res_holder, 0);
dev->dev_pr_res_holder = pr_reg;
pr_reg->pr_res_holder = 1;
pr_reg->pr_res_type = type;
pr_reg->pr_res_scope = scope;
pr_debug("SPC-3 PR [%s] Service Action: PREEMPT%s created new"
" reservation holder TYPE: %s ALL_TG_PT: %d\n",
tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
core_scsi3_pr_dump_type(type),
(pr_reg->pr_reg_all_tg_pt) ? 1 : 0);
pr_debug("SPC-3 PR [%s] PREEMPT%s from Node: %s%s\n",
tfo->get_fabric_name(), (abort) ? "_AND_ABORT" : "",
nacl->initiatorname, (prf_isid) ? &i_buf[0] : "");
/*
* For PREEMPT_AND_ABORT, add the preempting reservation's
* struct t10_pr_registration to the list that will be compared
* against received CDBs..
*/
if (preempt_and_abort_list)
list_add_tail(&pr_reg->pr_reg_abort_list,
preempt_and_abort_list);
}
static void core_scsi3_release_preempt_and_abort(
struct list_head *preempt_and_abort_list,
struct t10_pr_registration *pr_reg_holder)
{
struct t10_pr_registration *pr_reg, *pr_reg_tmp;
list_for_each_entry_safe(pr_reg, pr_reg_tmp, preempt_and_abort_list,
pr_reg_abort_list) {
list_del(&pr_reg->pr_reg_abort_list);
if (pr_reg_holder == pr_reg)
continue;
if (pr_reg->pr_res_holder) {
pr_warn("pr_reg->pr_res_holder still set\n");
continue;
}
pr_reg->pr_reg_deve = NULL;
pr_reg->pr_reg_nacl = NULL;
kfree(pr_reg->pr_aptpl_buf);
kmem_cache_free(t10_pr_reg_cache, pr_reg);
}
}
static int core_scsi3_pro_preempt(
struct se_cmd *cmd,
int type,
int scope,
u64 res_key,
u64 sa_res_key,
int abort)
{
struct se_device *dev = cmd->se_dev;
struct se_node_acl *pr_reg_nacl;
struct se_session *se_sess = cmd->se_sess;
LIST_HEAD(preempt_and_abort_list);
struct t10_pr_registration *pr_reg, *pr_reg_tmp, *pr_reg_n, *pr_res_holder;
struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
u32 pr_res_mapped_lun = 0;
int all_reg = 0, calling_it_nexus = 0, released_regs = 0;
int prh_type = 0, prh_scope = 0, ret;
if (!se_sess) {
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -EINVAL;
}
pr_reg_n = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
se_sess);
if (!pr_reg_n) {
pr_err("SPC-3 PR: Unable to locate"
" PR_REGISTERED *pr_reg for PREEMPT%s\n",
(abort) ? "_AND_ABORT" : "");
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EINVAL;
}
if (pr_reg_n->pr_res_key != res_key) {
core_scsi3_put_pr_reg(pr_reg_n);
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EINVAL;
}
if (scope != PR_SCOPE_LU_SCOPE) {
pr_err("SPC-3 PR: Illegal SCOPE: 0x%02x\n", scope);
core_scsi3_put_pr_reg(pr_reg_n);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
return -EINVAL;
}
spin_lock(&dev->dev_reservation_lock);
pr_res_holder = dev->dev_pr_res_holder;
if (pr_res_holder &&
((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
(pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)))
all_reg = 1;
if (!all_reg && !sa_res_key) {
spin_unlock(&dev->dev_reservation_lock);
core_scsi3_put_pr_reg(pr_reg_n);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
return -EINVAL;
}
/*
* From spc4r17, section 5.7.11.4.4 Removing Registrations:
*
* If the SERVICE ACTION RESERVATION KEY field does not identify a
* persistent reservation holder or there is no persistent reservation
* holder (i.e., there is no persistent reservation), then the device
* server shall perform a preempt by doing the following in an
* uninterrupted series of actions. (See below..)
*/
if (!pr_res_holder || (pr_res_holder->pr_res_key != sa_res_key)) {
/*
* No existing or SA Reservation Key matching reservations..
*
* PROUT SA PREEMPT with All Registrant type reservations are
* allowed to be processed without a matching SA Reservation Key
*/
spin_lock(&pr_tmpl->registration_lock);
list_for_each_entry_safe(pr_reg, pr_reg_tmp,
&pr_tmpl->registration_list, pr_reg_list) {
/*
* Removing of registrations in non all registrants
* type reservations without a matching SA reservation
* key.
*
* a) Remove the registrations for all I_T nexuses
* specified by the SERVICE ACTION RESERVATION KEY
* field;
* b) Ignore the contents of the SCOPE and TYPE fields;
* c) Process tasks as defined in 5.7.1; and
* d) Establish a unit attention condition for the
* initiator port associated with every I_T nexus
* that lost its registration other than the I_T
* nexus on which the PERSISTENT RESERVE OUT command
* was received, with the additional sense code set
* to REGISTRATIONS PREEMPTED.
*/
if (!all_reg) {
if (pr_reg->pr_res_key != sa_res_key)
continue;
calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
pr_reg_nacl = pr_reg->pr_reg_nacl;
pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
__core_scsi3_free_registration(dev, pr_reg,
(abort) ? &preempt_and_abort_list :
NULL, calling_it_nexus);
released_regs++;
} else {
/*
* Case for any existing all registrants type
* reservation, follow logic in spc4r17 section
* 5.7.11.4 Preempting, Table 52 and Figure 7.
*
* For a ZERO SA Reservation key, release
* all other registrations and do an implict
* release of active persistent reservation.
*
* For a non-ZERO SA Reservation key, only
* release the matching reservation key from
* registrations.
*/
if ((sa_res_key) &&
(pr_reg->pr_res_key != sa_res_key))
continue;
calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
if (calling_it_nexus)
continue;
pr_reg_nacl = pr_reg->pr_reg_nacl;
pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
__core_scsi3_free_registration(dev, pr_reg,
(abort) ? &preempt_and_abort_list :
NULL, 0);
released_regs++;
}
if (!calling_it_nexus)
core_scsi3_ua_allocate(pr_reg_nacl,
pr_res_mapped_lun, 0x2A,
ASCQ_2AH_REGISTRATIONS_PREEMPTED);
}
spin_unlock(&pr_tmpl->registration_lock);
/*
* If a PERSISTENT RESERVE OUT with a PREEMPT service action or
* a PREEMPT AND ABORT service action sets the SERVICE ACTION
* RESERVATION KEY field to a value that does not match any
* registered reservation key, then the device server shall
* complete the command with RESERVATION CONFLICT status.
*/
if (!released_regs) {
spin_unlock(&dev->dev_reservation_lock);
core_scsi3_put_pr_reg(pr_reg_n);
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EINVAL;
}
/*
* For an existing all registrants type reservation
* with a zero SA rservation key, preempt the existing
* reservation with the new PR type and scope.
*/
if (pr_res_holder && all_reg && !(sa_res_key)) {
__core_scsi3_complete_pro_preempt(dev, pr_reg_n,
(abort) ? &preempt_and_abort_list : NULL,
type, scope, abort);
if (abort)
core_scsi3_release_preempt_and_abort(
&preempt_and_abort_list, pr_reg_n);
}
spin_unlock(&dev->dev_reservation_lock);
if (pr_tmpl->pr_aptpl_active) {
ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
&pr_reg_n->pr_aptpl_buf[0],
pr_tmpl->pr_aptpl_buf_len);
if (!ret)
pr_debug("SPC-3 PR: Updated APTPL"
" metadata for PREEMPT%s\n", (abort) ?
"_AND_ABORT" : "");
}
core_scsi3_put_pr_reg(pr_reg_n);
core_scsi3_pr_generation(cmd->se_dev);
return 0;
}
/*
* The PREEMPTing SA reservation key matches that of the
* existing persistent reservation, first, we check if
* we are preempting our own reservation.
* From spc4r17, section 5.7.11.4.3 Preempting
* persistent reservations and registration handling
*
* If an all registrants persistent reservation is not
* present, it is not an error for the persistent
* reservation holder to preempt itself (i.e., a
* PERSISTENT RESERVE OUT with a PREEMPT service action
* or a PREEMPT AND ABORT service action with the
* SERVICE ACTION RESERVATION KEY value equal to the
* persistent reservation holder's reservation key that
* is received from the persistent reservation holder).
* In that case, the device server shall establish the
* new persistent reservation and maintain the
* registration.
*/
prh_type = pr_res_holder->pr_res_type;
prh_scope = pr_res_holder->pr_res_scope;
/*
* If the SERVICE ACTION RESERVATION KEY field identifies a
* persistent reservation holder (see 5.7.10), the device
* server shall perform a preempt by doing the following as
* an uninterrupted series of actions:
*
* a) Release the persistent reservation for the holder
* identified by the SERVICE ACTION RESERVATION KEY field;
*/
if (pr_reg_n != pr_res_holder)
__core_scsi3_complete_pro_release(dev,
pr_res_holder->pr_reg_nacl,
dev->dev_pr_res_holder, 0);
/*
* b) Remove the registrations for all I_T nexuses identified
* by the SERVICE ACTION RESERVATION KEY field, except the
* I_T nexus that is being used for the PERSISTENT RESERVE
* OUT command. If an all registrants persistent reservation
* is present and the SERVICE ACTION RESERVATION KEY field
* is set to zero, then all registrations shall be removed
* except for that of the I_T nexus that is being used for
* the PERSISTENT RESERVE OUT command;
*/
spin_lock(&pr_tmpl->registration_lock);
list_for_each_entry_safe(pr_reg, pr_reg_tmp,
&pr_tmpl->registration_list, pr_reg_list) {
calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
if (calling_it_nexus)
continue;
if (pr_reg->pr_res_key != sa_res_key)
continue;
pr_reg_nacl = pr_reg->pr_reg_nacl;
pr_res_mapped_lun = pr_reg->pr_res_mapped_lun;
__core_scsi3_free_registration(dev, pr_reg,
(abort) ? &preempt_and_abort_list : NULL,
calling_it_nexus);
/*
* e) Establish a unit attention condition for the initiator
* port associated with every I_T nexus that lost its
* persistent reservation and/or registration, with the
* additional sense code set to REGISTRATIONS PREEMPTED;
*/
core_scsi3_ua_allocate(pr_reg_nacl, pr_res_mapped_lun, 0x2A,
ASCQ_2AH_REGISTRATIONS_PREEMPTED);
}
spin_unlock(&pr_tmpl->registration_lock);
/*
* c) Establish a persistent reservation for the preempting
* I_T nexus using the contents of the SCOPE and TYPE fields;
*/
__core_scsi3_complete_pro_preempt(dev, pr_reg_n,
(abort) ? &preempt_and_abort_list : NULL,
type, scope, abort);
/*
* d) Process tasks as defined in 5.7.1;
* e) See above..
* f) If the type or scope has changed, then for every I_T nexus
* whose reservation key was not removed, except for the I_T
* nexus on which the PERSISTENT RESERVE OUT command was
* received, the device server shall establish a unit
* attention condition for the initiator port associated with
* that I_T nexus, with the additional sense code set to
* RESERVATIONS RELEASED. If the type or scope have not
* changed, then no unit attention condition(s) shall be
* established for this reason.
*/
if ((prh_type != type) || (prh_scope != scope)) {
spin_lock(&pr_tmpl->registration_lock);
list_for_each_entry_safe(pr_reg, pr_reg_tmp,
&pr_tmpl->registration_list, pr_reg_list) {
calling_it_nexus = (pr_reg_n == pr_reg) ? 1 : 0;
if (calling_it_nexus)
continue;
core_scsi3_ua_allocate(pr_reg->pr_reg_nacl,
pr_reg->pr_res_mapped_lun, 0x2A,
ASCQ_2AH_RESERVATIONS_RELEASED);
}
spin_unlock(&pr_tmpl->registration_lock);
}
spin_unlock(&dev->dev_reservation_lock);
/*
* Call LUN_RESET logic upon list of struct t10_pr_registration,
* All received CDBs for the matching existing reservation and
* registrations undergo ABORT_TASK logic.
*
* From there, core_scsi3_release_preempt_and_abort() will
* release every registration in the list (which have already
* been removed from the primary pr_reg list), except the
* new persistent reservation holder, the calling Initiator Port.
*/
if (abort) {
core_tmr_lun_reset(dev, NULL, &preempt_and_abort_list, cmd);
core_scsi3_release_preempt_and_abort(&preempt_and_abort_list,
pr_reg_n);
}
if (pr_tmpl->pr_aptpl_active) {
ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
&pr_reg_n->pr_aptpl_buf[0],
pr_tmpl->pr_aptpl_buf_len);
if (!ret)
pr_debug("SPC-3 PR: Updated APTPL metadata for PREEMPT"
"%s\n", (abort) ? "_AND_ABORT" : "");
}
core_scsi3_put_pr_reg(pr_reg_n);
core_scsi3_pr_generation(cmd->se_dev);
return 0;
}
static int core_scsi3_emulate_pro_preempt(
struct se_cmd *cmd,
int type,
int scope,
u64 res_key,
u64 sa_res_key,
int abort)
{
int ret = 0;
switch (type) {
case PR_TYPE_WRITE_EXCLUSIVE:
case PR_TYPE_EXCLUSIVE_ACCESS:
case PR_TYPE_WRITE_EXCLUSIVE_REGONLY:
case PR_TYPE_EXCLUSIVE_ACCESS_REGONLY:
case PR_TYPE_WRITE_EXCLUSIVE_ALLREG:
case PR_TYPE_EXCLUSIVE_ACCESS_ALLREG:
ret = core_scsi3_pro_preempt(cmd, type, scope,
res_key, sa_res_key, abort);
break;
default:
pr_err("SPC-3 PR: Unknown Service Action PREEMPT%s"
" Type: 0x%02x\n", (abort) ? "_AND_ABORT" : "", type);
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
return -EINVAL;
}
return ret;
}
static int core_scsi3_emulate_pro_register_and_move(
struct se_cmd *cmd,
u64 res_key,
u64 sa_res_key,
int aptpl,
int unreg)
{
struct se_session *se_sess = cmd->se_sess;
struct se_device *dev = cmd->se_dev;
struct se_dev_entry *dest_se_deve = NULL;
struct se_lun *se_lun = cmd->se_lun;
struct se_node_acl *pr_res_nacl, *pr_reg_nacl, *dest_node_acl = NULL;
struct se_port *se_port;
struct se_portal_group *se_tpg, *dest_se_tpg = NULL;
struct target_core_fabric_ops *dest_tf_ops = NULL, *tf_ops;
struct t10_pr_registration *pr_reg, *pr_res_holder, *dest_pr_reg;
struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
unsigned char *buf;
unsigned char *initiator_str;
char *iport_ptr = NULL, dest_iport[64], i_buf[PR_REG_ISID_ID_LEN];
u32 tid_len, tmp_tid_len;
int new_reg = 0, type, scope, ret, matching_iname, prf_isid;
unsigned short rtpi;
unsigned char proto_ident;
if (!se_sess || !se_lun) {
pr_err("SPC-3 PR: se_sess || struct se_lun is NULL!\n");
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -EINVAL;
}
memset(dest_iport, 0, 64);
memset(i_buf, 0, PR_REG_ISID_ID_LEN);
se_tpg = se_sess->se_tpg;
tf_ops = se_tpg->se_tpg_tfo;
/*
* Follow logic from spc4r17 Section 5.7.8, Table 50 --
* Register behaviors for a REGISTER AND MOVE service action
*
* Locate the existing *pr_reg via struct se_node_acl pointers
*/
pr_reg = core_scsi3_locate_pr_reg(cmd->se_dev, se_sess->se_node_acl,
se_sess);
if (!pr_reg) {
pr_err("SPC-3 PR: Unable to locate PR_REGISTERED"
" *pr_reg for REGISTER_AND_MOVE\n");
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -EINVAL;
}
/*
* The provided reservation key much match the existing reservation key
* provided during this initiator's I_T nexus registration.
*/
if (res_key != pr_reg->pr_res_key) {
pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received"
" res_key: 0x%016Lx does not match existing SA REGISTER"
" res_key: 0x%016Lx\n", res_key, pr_reg->pr_res_key);
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EINVAL;
}
/*
* The service active reservation key needs to be non zero
*/
if (!sa_res_key) {
pr_warn("SPC-3 PR REGISTER_AND_MOVE: Received zero"
" sa_res_key\n");
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
return -EINVAL;
}
/*
* Determine the Relative Target Port Identifier where the reservation
* will be moved to for the TransportID containing SCSI initiator WWN
* information.
*/
buf = transport_kmap_data_sg(cmd);
rtpi = (buf[18] & 0xff) << 8;
rtpi |= buf[19] & 0xff;
tid_len = (buf[20] & 0xff) << 24;
tid_len |= (buf[21] & 0xff) << 16;
tid_len |= (buf[22] & 0xff) << 8;
tid_len |= buf[23] & 0xff;
transport_kunmap_data_sg(cmd);
buf = NULL;
if ((tid_len + 24) != cmd->data_length) {
pr_err("SPC-3 PR: Illegal tid_len: %u + 24 byte header"
" does not equal CDB data_length: %u\n", tid_len,
cmd->data_length);
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
return -EINVAL;
}
spin_lock(&dev->se_port_lock);
list_for_each_entry(se_port, &dev->dev_sep_list, sep_list) {
if (se_port->sep_rtpi != rtpi)
continue;
dest_se_tpg = se_port->sep_tpg;
if (!dest_se_tpg)
continue;
dest_tf_ops = dest_se_tpg->se_tpg_tfo;
if (!dest_tf_ops)
continue;
atomic_inc(&dest_se_tpg->tpg_pr_ref_count);
smp_mb__after_atomic_inc();
spin_unlock(&dev->se_port_lock);
ret = core_scsi3_tpg_depend_item(dest_se_tpg);
if (ret != 0) {
pr_err("core_scsi3_tpg_depend_item() failed"
" for dest_se_tpg\n");
atomic_dec(&dest_se_tpg->tpg_pr_ref_count);
smp_mb__after_atomic_dec();
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -EINVAL;
}
spin_lock(&dev->se_port_lock);
break;
}
spin_unlock(&dev->se_port_lock);
if (!dest_se_tpg || !dest_tf_ops) {
pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
" fabric ops from Relative Target Port Identifier:"
" %hu\n", rtpi);
core_scsi3_put_pr_reg(pr_reg);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
return -EINVAL;
}
buf = transport_kmap_data_sg(cmd);
proto_ident = (buf[24] & 0x0f);
pr_debug("SPC-3 PR REGISTER_AND_MOVE: Extracted Protocol Identifier:"
" 0x%02x\n", proto_ident);
if (proto_ident != dest_tf_ops->get_fabric_proto_ident(dest_se_tpg)) {
pr_err("SPC-3 PR REGISTER_AND_MOVE: Received"
" proto_ident: 0x%02x does not match ident: 0x%02x"
" from fabric: %s\n", proto_ident,
dest_tf_ops->get_fabric_proto_ident(dest_se_tpg),
dest_tf_ops->get_fabric_name());
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
if (dest_tf_ops->tpg_parse_pr_out_transport_id == NULL) {
pr_err("SPC-3 PR REGISTER_AND_MOVE: Fabric does not"
" containg a valid tpg_parse_pr_out_transport_id"
" function pointer\n");
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
ret = -EINVAL;
goto out;
}
initiator_str = dest_tf_ops->tpg_parse_pr_out_transport_id(dest_se_tpg,
(const char *)&buf[24], &tmp_tid_len, &iport_ptr);
if (!initiator_str) {
pr_err("SPC-3 PR REGISTER_AND_MOVE: Unable to locate"
" initiator_str from Transport ID\n");
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
transport_kunmap_data_sg(cmd);
buf = NULL;
pr_debug("SPC-3 PR [%s] Extracted initiator %s identifier: %s"
" %s\n", dest_tf_ops->get_fabric_name(), (iport_ptr != NULL) ?
"port" : "device", initiator_str, (iport_ptr != NULL) ?
iport_ptr : "");
/*
* If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
* action specifies a TransportID that is the same as the initiator port
* of the I_T nexus for the command received, then the command shall
* be terminated with CHECK CONDITION status, with the sense key set to
* ILLEGAL REQUEST, and the additional sense code set to INVALID FIELD
* IN PARAMETER LIST.
*/
pr_reg_nacl = pr_reg->pr_reg_nacl;
matching_iname = (!strcmp(initiator_str,
pr_reg_nacl->initiatorname)) ? 1 : 0;
if (!matching_iname)
goto after_iport_check;
if (!iport_ptr || !pr_reg->isid_present_at_reg) {
pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s"
" matches: %s on received I_T Nexus\n", initiator_str,
pr_reg_nacl->initiatorname);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
if (!strcmp(iport_ptr, pr_reg->pr_reg_isid)) {
pr_err("SPC-3 PR REGISTER_AND_MOVE: TransportID: %s %s"
" matches: %s %s on received I_T Nexus\n",
initiator_str, iport_ptr, pr_reg_nacl->initiatorname,
pr_reg->pr_reg_isid);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
after_iport_check:
/*
* Locate the destination struct se_node_acl from the received Transport ID
*/
spin_lock_irq(&dest_se_tpg->acl_node_lock);
dest_node_acl = __core_tpg_get_initiator_node_acl(dest_se_tpg,
initiator_str);
if (dest_node_acl) {
atomic_inc(&dest_node_acl->acl_pr_ref_count);
smp_mb__after_atomic_inc();
}
spin_unlock_irq(&dest_se_tpg->acl_node_lock);
if (!dest_node_acl) {
pr_err("Unable to locate %s dest_node_acl for"
" TransportID%s\n", dest_tf_ops->get_fabric_name(),
initiator_str);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
ret = core_scsi3_nodeacl_depend_item(dest_node_acl);
if (ret != 0) {
pr_err("core_scsi3_nodeacl_depend_item() for"
" dest_node_acl\n");
atomic_dec(&dest_node_acl->acl_pr_ref_count);
smp_mb__after_atomic_dec();
dest_node_acl = NULL;
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
pr_debug("SPC-3 PR REGISTER_AND_MOVE: Found %s dest_node_acl:"
" %s from TransportID\n", dest_tf_ops->get_fabric_name(),
dest_node_acl->initiatorname);
/*
* Locate the struct se_dev_entry pointer for the matching RELATIVE TARGET
* PORT IDENTIFIER.
*/
dest_se_deve = core_get_se_deve_from_rtpi(dest_node_acl, rtpi);
if (!dest_se_deve) {
pr_err("Unable to locate %s dest_se_deve from RTPI:"
" %hu\n", dest_tf_ops->get_fabric_name(), rtpi);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
ret = core_scsi3_lunacl_depend_item(dest_se_deve);
if (ret < 0) {
pr_err("core_scsi3_lunacl_depend_item() failed\n");
atomic_dec(&dest_se_deve->pr_ref_count);
smp_mb__after_atomic_dec();
dest_se_deve = NULL;
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
ret = -EINVAL;
goto out;
}
pr_debug("SPC-3 PR REGISTER_AND_MOVE: Located %s node %s LUN"
" ACL for dest_se_deve->mapped_lun: %u\n",
dest_tf_ops->get_fabric_name(), dest_node_acl->initiatorname,
dest_se_deve->mapped_lun);
/*
* A persistent reservation needs to already existing in order to
* successfully complete the REGISTER_AND_MOVE service action..
*/
spin_lock(&dev->dev_reservation_lock);
pr_res_holder = dev->dev_pr_res_holder;
if (!pr_res_holder) {
pr_warn("SPC-3 PR REGISTER_AND_MOVE: No reservation"
" currently held\n");
spin_unlock(&dev->dev_reservation_lock);
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
ret = -EINVAL;
goto out;
}
/*
* The received on I_T Nexus must be the reservation holder.
*
* From spc4r17 section 5.7.8 Table 50 --
* Register behaviors for a REGISTER AND MOVE service action
*/
if (pr_res_holder != pr_reg) {
pr_warn("SPC-3 PR REGISTER_AND_MOVE: Calling I_T"
" Nexus is not reservation holder\n");
spin_unlock(&dev->dev_reservation_lock);
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
ret = -EINVAL;
goto out;
}
/*
* From spc4r17 section 5.7.8: registering and moving reservation
*
* If a PERSISTENT RESERVE OUT command with a REGISTER AND MOVE service
* action is received and the established persistent reservation is a
* Write Exclusive - All Registrants type or Exclusive Access -
* All Registrants type reservation, then the command shall be completed
* with RESERVATION CONFLICT status.
*/
if ((pr_res_holder->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
(pr_res_holder->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG)) {
pr_warn("SPC-3 PR REGISTER_AND_MOVE: Unable to move"
" reservation for type: %s\n",
core_scsi3_pr_dump_type(pr_res_holder->pr_res_type));
spin_unlock(&dev->dev_reservation_lock);
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
ret = -EINVAL;
goto out;
}
pr_res_nacl = pr_res_holder->pr_reg_nacl;
/*
* b) Ignore the contents of the (received) SCOPE and TYPE fields;
*/
type = pr_res_holder->pr_res_type;
scope = pr_res_holder->pr_res_type;
/*
* c) Associate the reservation key specified in the SERVICE ACTION
* RESERVATION KEY field with the I_T nexus specified as the
* destination of the register and move, where:
* A) The I_T nexus is specified by the TransportID and the
* RELATIVE TARGET PORT IDENTIFIER field (see 6.14.4); and
* B) Regardless of the TransportID format used, the association for
* the initiator port is based on either the initiator port name
* (see 3.1.71) on SCSI transport protocols where port names are
* required or the initiator port identifier (see 3.1.70) on SCSI
* transport protocols where port names are not required;
* d) Register the reservation key specified in the SERVICE ACTION
* RESERVATION KEY field;
* e) Retain the reservation key specified in the SERVICE ACTION
* RESERVATION KEY field and associated information;
*
* Also, It is not an error for a REGISTER AND MOVE service action to
* register an I_T nexus that is already registered with the same
* reservation key or a different reservation key.
*/
dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
iport_ptr);
if (!dest_pr_reg) {
ret = core_scsi3_alloc_registration(cmd->se_dev,
dest_node_acl, dest_se_deve, iport_ptr,
sa_res_key, 0, aptpl, 2, 1);
if (ret != 0) {
spin_unlock(&dev->dev_reservation_lock);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
dest_pr_reg = __core_scsi3_locate_pr_reg(dev, dest_node_acl,
iport_ptr);
new_reg = 1;
}
/*
* f) Release the persistent reservation for the persistent reservation
* holder (i.e., the I_T nexus on which the
*/
__core_scsi3_complete_pro_release(dev, pr_res_nacl,
dev->dev_pr_res_holder, 0);
/*
* g) Move the persistent reservation to the specified I_T nexus using
* the same scope and type as the persistent reservation released in
* item f); and
*/
dev->dev_pr_res_holder = dest_pr_reg;
dest_pr_reg->pr_res_holder = 1;
dest_pr_reg->pr_res_type = type;
pr_reg->pr_res_scope = scope;
prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],
PR_REG_ISID_ID_LEN);
/*
* Increment PRGeneration for existing registrations..
*/
if (!new_reg)
dest_pr_reg->pr_res_generation = pr_tmpl->pr_generation++;
spin_unlock(&dev->dev_reservation_lock);
pr_debug("SPC-3 PR [%s] Service Action: REGISTER_AND_MOVE"
" created new reservation holder TYPE: %s on object RTPI:"
" %hu PRGeneration: 0x%08x\n", dest_tf_ops->get_fabric_name(),
core_scsi3_pr_dump_type(type), rtpi,
dest_pr_reg->pr_res_generation);
pr_debug("SPC-3 PR Successfully moved reservation from"
" %s Fabric Node: %s%s -> %s Fabric Node: %s %s\n",
tf_ops->get_fabric_name(), pr_reg_nacl->initiatorname,
(prf_isid) ? &i_buf[0] : "", dest_tf_ops->get_fabric_name(),
dest_node_acl->initiatorname, (iport_ptr != NULL) ?
iport_ptr : "");
/*
* It is now safe to release configfs group dependencies for destination
* of Transport ID Initiator Device/Port Identifier
*/
core_scsi3_lunacl_undepend_item(dest_se_deve);
core_scsi3_nodeacl_undepend_item(dest_node_acl);
core_scsi3_tpg_undepend_item(dest_se_tpg);
/*
* h) If the UNREG bit is set to one, unregister (see 5.7.11.3) the I_T
* nexus on which PERSISTENT RESERVE OUT command was received.
*/
if (unreg) {
spin_lock(&pr_tmpl->registration_lock);
__core_scsi3_free_registration(dev, pr_reg, NULL, 1);
spin_unlock(&pr_tmpl->registration_lock);
} else
core_scsi3_put_pr_reg(pr_reg);
/*
* Clear the APTPL metadata if APTPL has been disabled, otherwise
* write out the updated metadata to struct file for this SCSI device.
*/
if (!aptpl) {
pr_tmpl->pr_aptpl_active = 0;
core_scsi3_update_and_write_aptpl(cmd->se_dev, NULL, 0);
pr_debug("SPC-3 PR: Set APTPL Bit Deactivated for"
" REGISTER_AND_MOVE\n");
} else {
pr_tmpl->pr_aptpl_active = 1;
ret = core_scsi3_update_and_write_aptpl(cmd->se_dev,
&dest_pr_reg->pr_aptpl_buf[0],
pr_tmpl->pr_aptpl_buf_len);
if (!ret)
pr_debug("SPC-3 PR: Set APTPL Bit Activated for"
" REGISTER_AND_MOVE\n");
}
transport_kunmap_data_sg(cmd);
core_scsi3_put_pr_reg(dest_pr_reg);
return 0;
out:
if (buf)
transport_kunmap_data_sg(cmd);
if (dest_se_deve)
core_scsi3_lunacl_undepend_item(dest_se_deve);
if (dest_node_acl)
core_scsi3_nodeacl_undepend_item(dest_node_acl);
core_scsi3_tpg_undepend_item(dest_se_tpg);
core_scsi3_put_pr_reg(pr_reg);
return ret;
}
static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
{
unsigned int __v1, __v2;
__v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
__v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
}
/*
* See spc4r17 section 6.14 Table 170
*/
int target_scsi3_emulate_pr_out(struct se_cmd *cmd)
{
unsigned char *cdb = &cmd->t_task_cdb[0];
unsigned char *buf;
u64 res_key, sa_res_key;
int sa, scope, type, aptpl;
int spec_i_pt = 0, all_tg_pt = 0, unreg = 0;
int ret;
/*
* Following spc2r20 5.5.1 Reservations overview:
*
* If a logical unit has been reserved by any RESERVE command and is
* still reserved by any initiator, all PERSISTENT RESERVE IN and all
* PERSISTENT RESERVE OUT commands shall conflict regardless of
* initiator or service action and shall terminate with a RESERVATION
* CONFLICT status.
*/
if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) {
pr_err("Received PERSISTENT_RESERVE CDB while legacy"
" SPC-2 reservation is held, returning"
" RESERVATION_CONFLICT\n");
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
ret = EINVAL;
goto out;
}
/*
* FIXME: A NULL struct se_session pointer means an this is not coming from
* a $FABRIC_MOD's nexus, but from internal passthrough ops.
*/
if (!cmd->se_sess) {
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
return -EINVAL;
}
if (cmd->data_length < 24) {
pr_warn("SPC-PR: Received PR OUT parameter list"
" length too small: %u\n", cmd->data_length);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
/*
* From the PERSISTENT_RESERVE_OUT command descriptor block (CDB)
*/
sa = (cdb[1] & 0x1f);
scope = (cdb[2] & 0xf0);
type = (cdb[2] & 0x0f);
buf = transport_kmap_data_sg(cmd);
/*
* From PERSISTENT_RESERVE_OUT parameter list (payload)
*/
res_key = core_scsi3_extract_reservation_key(&buf[0]);
sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
/*
* REGISTER_AND_MOVE uses a different SA parameter list containing
* SCSI TransportIDs.
*/
if (sa != PRO_REGISTER_AND_MOVE) {
spec_i_pt = (buf[20] & 0x08);
all_tg_pt = (buf[20] & 0x04);
aptpl = (buf[20] & 0x01);
} else {
aptpl = (buf[17] & 0x01);
unreg = (buf[17] & 0x02);
}
transport_kunmap_data_sg(cmd);
buf = NULL;
/*
* SPEC_I_PT=1 is only valid for Service action: REGISTER
*/
if (spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER)) {
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
/*
* From spc4r17 section 6.14:
*
* If the SPEC_I_PT bit is set to zero, the service action is not
* REGISTER AND MOVE, and the parameter list length is not 24, then
* the command shall be terminated with CHECK CONDITION status, with
* the sense key set to ILLEGAL REQUEST, and the additional sense
* code set to PARAMETER LIST LENGTH ERROR.
*/
if (!spec_i_pt && ((cdb[1] & 0x1f) != PRO_REGISTER_AND_MOVE) &&
(cmd->data_length != 24)) {
pr_warn("SPC-PR: Received PR OUT illegal parameter"
" list length: %u\n", cmd->data_length);
cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST;
ret = -EINVAL;
goto out;
}
/*
* (core_scsi3_emulate_pro_* function parameters
* are defined by spc4r17 Table 174:
* PERSISTENT_RESERVE_OUT service actions and valid parameters.
*/
switch (sa) {
case PRO_REGISTER:
ret = core_scsi3_emulate_pro_register(cmd,
res_key, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 0);
break;
case PRO_RESERVE:
ret = core_scsi3_emulate_pro_reserve(cmd, type, scope, res_key);
break;
case PRO_RELEASE:
ret = core_scsi3_emulate_pro_release(cmd, type, scope, res_key);
break;
case PRO_CLEAR:
ret = core_scsi3_emulate_pro_clear(cmd, res_key);
break;
case PRO_PREEMPT:
ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
res_key, sa_res_key, 0);
break;
case PRO_PREEMPT_AND_ABORT:
ret = core_scsi3_emulate_pro_preempt(cmd, type, scope,
res_key, sa_res_key, 1);
break;
case PRO_REGISTER_AND_IGNORE_EXISTING_KEY:
ret = core_scsi3_emulate_pro_register(cmd,
0, sa_res_key, aptpl, all_tg_pt, spec_i_pt, 1);
break;
case PRO_REGISTER_AND_MOVE:
ret = core_scsi3_emulate_pro_register_and_move(cmd, res_key,
sa_res_key, aptpl, unreg);
break;
default:
pr_err("Unknown PERSISTENT_RESERVE_OUT service"
" action: 0x%02x\n", cdb[1] & 0x1f);
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
ret = -EINVAL;
break;
}
out:
if (!ret)
target_complete_cmd(cmd, GOOD);
return ret;
}
/*
* PERSISTENT_RESERVE_IN Service Action READ_KEYS
*
* See spc4r17 section 5.7.6.2 and section 6.13.2, Table 160
*/
static int core_scsi3_pri_read_keys(struct se_cmd *cmd)
{
struct se_device *se_dev = cmd->se_dev;
struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
struct t10_pr_registration *pr_reg;
unsigned char *buf;
u32 add_len = 0, off = 8;
if (cmd->data_length < 8) {
pr_err("PRIN SA READ_KEYS SCSI Data Length: %u"
" too small\n", cmd->data_length);
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
return -EINVAL;
}
buf = transport_kmap_data_sg(cmd);
buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
spin_lock(&su_dev->t10_pr.registration_lock);
list_for_each_entry(pr_reg, &su_dev->t10_pr.registration_list,
pr_reg_list) {
/*
* Check for overflow of 8byte PRI READ_KEYS payload and
* next reservation key list descriptor.
*/
if ((add_len + 8) > (cmd->data_length - 8))
break;
buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
buf[off++] = (pr_reg->pr_res_key & 0xff);
add_len += 8;
}
spin_unlock(&su_dev->t10_pr.registration_lock);
buf[4] = ((add_len >> 24) & 0xff);
buf[5] = ((add_len >> 16) & 0xff);
buf[6] = ((add_len >> 8) & 0xff);
buf[7] = (add_len & 0xff);
transport_kunmap_data_sg(cmd);
return 0;
}
/*
* PERSISTENT_RESERVE_IN Service Action READ_RESERVATION
*
* See spc4r17 section 5.7.6.3 and section 6.13.3.2 Table 161 and 162
*/
static int core_scsi3_pri_read_reservation(struct se_cmd *cmd)
{
struct se_device *se_dev = cmd->se_dev;
struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
struct t10_pr_registration *pr_reg;
unsigned char *buf;
u64 pr_res_key;
u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */
if (cmd->data_length < 8) {
pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u"
" too small\n", cmd->data_length);
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
return -EINVAL;
}
buf = transport_kmap_data_sg(cmd);
buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
spin_lock(&se_dev->dev_reservation_lock);
pr_reg = se_dev->dev_pr_res_holder;
if ((pr_reg)) {
/*
* Set the hardcoded Additional Length
*/
buf[4] = ((add_len >> 24) & 0xff);
buf[5] = ((add_len >> 16) & 0xff);
buf[6] = ((add_len >> 8) & 0xff);
buf[7] = (add_len & 0xff);
if (cmd->data_length < 22)
goto err;
/*
* Set the Reservation key.
*
* From spc4r17, section 5.7.10:
* A persistent reservation holder has its reservation key
* returned in the parameter data from a PERSISTENT
* RESERVE IN command with READ RESERVATION service action as
* follows:
* a) For a persistent reservation of the type Write Exclusive
* - All Registrants or Exclusive Access ­ All Regitrants,
* the reservation key shall be set to zero; or
* b) For all other persistent reservation types, the
* reservation key shall be set to the registered
* reservation key for the I_T nexus that holds the
* persistent reservation.
*/
if ((pr_reg->pr_res_type == PR_TYPE_WRITE_EXCLUSIVE_ALLREG) ||
(pr_reg->pr_res_type == PR_TYPE_EXCLUSIVE_ACCESS_ALLREG))
pr_res_key = 0;
else
pr_res_key = pr_reg->pr_res_key;
buf[8] = ((pr_res_key >> 56) & 0xff);
buf[9] = ((pr_res_key >> 48) & 0xff);
buf[10] = ((pr_res_key >> 40) & 0xff);
buf[11] = ((pr_res_key >> 32) & 0xff);
buf[12] = ((pr_res_key >> 24) & 0xff);
buf[13] = ((pr_res_key >> 16) & 0xff);
buf[14] = ((pr_res_key >> 8) & 0xff);
buf[15] = (pr_res_key & 0xff);
/*
* Set the SCOPE and TYPE
*/
buf[21] = (pr_reg->pr_res_scope & 0xf0) |
(pr_reg->pr_res_type & 0x0f);
}
err:
spin_unlock(&se_dev->dev_reservation_lock);
transport_kunmap_data_sg(cmd);
return 0;
}
/*
* PERSISTENT_RESERVE_IN Service Action REPORT_CAPABILITIES
*
* See spc4r17 section 6.13.4 Table 165
*/
static int core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
{
struct se_device *dev = cmd->se_dev;
struct t10_reservation *pr_tmpl = &dev->se_sub_dev->t10_pr;
unsigned char *buf;
u16 add_len = 8; /* Hardcoded to 8. */
if (cmd->data_length < 6) {
pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:"
" %u too small\n", cmd->data_length);
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
return -EINVAL;
}
buf = transport_kmap_data_sg(cmd);
buf[0] = ((add_len << 8) & 0xff);
buf[1] = (add_len & 0xff);
buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
buf[2] |= 0x01; /* PTPL_C: Persistence across Target Power Loss bit */
/*
* We are filling in the PERSISTENT RESERVATION TYPE MASK below, so
* set the TMV: Task Mask Valid bit.
*/
buf[3] |= 0x80;
/*
* Change ALLOW COMMANDs to 0x20 or 0x40 later from Table 166
*/
buf[3] |= 0x10; /* ALLOW COMMANDs field 001b */
/*
* PTPL_A: Persistence across Target Power Loss Active bit
*/
if (pr_tmpl->pr_aptpl_active)
buf[3] |= 0x01;
/*
* Setup the PERSISTENT RESERVATION TYPE MASK from Table 167
*/
buf[4] |= 0x80; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
buf[4] |= 0x40; /* PR_TYPE_EXCLUSIVE_ACCESS_REGONLY */
buf[4] |= 0x20; /* PR_TYPE_WRITE_EXCLUSIVE_REGONLY */
buf[4] |= 0x08; /* PR_TYPE_EXCLUSIVE_ACCESS */
buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */
buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */
transport_kunmap_data_sg(cmd);
return 0;
}
/*
* PERSISTENT_RESERVE_IN Service Action READ_FULL_STATUS
*
* See spc4r17 section 6.13.5 Table 168 and 169
*/
static int core_scsi3_pri_read_full_status(struct se_cmd *cmd)
{
struct se_device *se_dev = cmd->se_dev;
struct se_node_acl *se_nacl;
struct se_subsystem_dev *su_dev = se_dev->se_sub_dev;
struct se_portal_group *se_tpg;
struct t10_pr_registration *pr_reg, *pr_reg_tmp;
struct t10_reservation *pr_tmpl = &se_dev->se_sub_dev->t10_pr;
unsigned char *buf;
u32 add_desc_len = 0, add_len = 0, desc_len, exp_desc_len;
u32 off = 8; /* off into first Full Status descriptor */
int format_code = 0;
if (cmd->data_length < 8) {
pr_err("PRIN SA READ_FULL_STATUS SCSI Data Length: %u"
" too small\n", cmd->data_length);
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
return -EINVAL;
}
buf = transport_kmap_data_sg(cmd);
buf[0] = ((su_dev->t10_pr.pr_generation >> 24) & 0xff);
buf[1] = ((su_dev->t10_pr.pr_generation >> 16) & 0xff);
buf[2] = ((su_dev->t10_pr.pr_generation >> 8) & 0xff);
buf[3] = (su_dev->t10_pr.pr_generation & 0xff);
spin_lock(&pr_tmpl->registration_lock);
list_for_each_entry_safe(pr_reg, pr_reg_tmp,
&pr_tmpl->registration_list, pr_reg_list) {
se_nacl = pr_reg->pr_reg_nacl;
se_tpg = pr_reg->pr_reg_nacl->se_tpg;
add_desc_len = 0;
atomic_inc(&pr_reg->pr_res_holders);
smp_mb__after_atomic_inc();
spin_unlock(&pr_tmpl->registration_lock);
/*
* Determine expected length of $FABRIC_MOD specific
* TransportID full status descriptor..
*/
exp_desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id_len(
se_tpg, se_nacl, pr_reg, &format_code);
if ((exp_desc_len + add_len) > cmd->data_length) {
pr_warn("SPC-3 PRIN READ_FULL_STATUS ran"
" out of buffer: %d\n", cmd->data_length);
spin_lock(&pr_tmpl->registration_lock);
atomic_dec(&pr_reg->pr_res_holders);
smp_mb__after_atomic_dec();
break;
}
/*
* Set RESERVATION KEY
*/
buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
buf[off++] = (pr_reg->pr_res_key & 0xff);
off += 4; /* Skip Over Reserved area */
/*
* Set ALL_TG_PT bit if PROUT SA REGISTER had this set.
*/
if (pr_reg->pr_reg_all_tg_pt)
buf[off] = 0x02;
/*
* The struct se_lun pointer will be present for the
* reservation holder for PR_HOLDER bit.
*
* Also, if this registration is the reservation
* holder, fill in SCOPE and TYPE in the next byte.
*/
if (pr_reg->pr_res_holder) {
buf[off++] |= 0x01;
buf[off++] = (pr_reg->pr_res_scope & 0xf0) |
(pr_reg->pr_res_type & 0x0f);
} else
off += 2;
off += 4; /* Skip over reserved area */
/*
* From spc4r17 6.3.15:
*
* If the ALL_TG_PT bit set to zero, the RELATIVE TARGET PORT
* IDENTIFIER field contains the relative port identifier (see
* 3.1.120) of the target port that is part of the I_T nexus
* described by this full status descriptor. If the ALL_TG_PT
* bit is set to one, the contents of the RELATIVE TARGET PORT
* IDENTIFIER field are not defined by this standard.
*/
if (!pr_reg->pr_reg_all_tg_pt) {
struct se_port *port = pr_reg->pr_reg_tg_pt_lun->lun_sep;
buf[off++] = ((port->sep_rtpi >> 8) & 0xff);
buf[off++] = (port->sep_rtpi & 0xff);
} else
off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFER */
/*
* Now, have the $FABRIC_MOD fill in the protocol identifier
*/
desc_len = se_tpg->se_tpg_tfo->tpg_get_pr_transport_id(se_tpg,
se_nacl, pr_reg, &format_code, &buf[off+4]);
spin_lock(&pr_tmpl->registration_lock);
atomic_dec(&pr_reg->pr_res_holders);
smp_mb__after_atomic_dec();
/*
* Set the ADDITIONAL DESCRIPTOR LENGTH
*/
buf[off++] = ((desc_len >> 24) & 0xff);
buf[off++] = ((desc_len >> 16) & 0xff);
buf[off++] = ((desc_len >> 8) & 0xff);
buf[off++] = (desc_len & 0xff);
/*
* Size of full desctipor header minus TransportID
* containing $FABRIC_MOD specific) initiator device/port
* WWN information.
*
* See spc4r17 Section 6.13.5 Table 169
*/
add_desc_len = (24 + desc_len);
off += desc_len;
add_len += add_desc_len;
}
spin_unlock(&pr_tmpl->registration_lock);
/*
* Set ADDITIONAL_LENGTH
*/
buf[4] = ((add_len >> 24) & 0xff);
buf[5] = ((add_len >> 16) & 0xff);
buf[6] = ((add_len >> 8) & 0xff);
buf[7] = (add_len & 0xff);
transport_kunmap_data_sg(cmd);
return 0;
}
int target_scsi3_emulate_pr_in(struct se_cmd *cmd)
{
int ret;
/*
* Following spc2r20 5.5.1 Reservations overview:
*
* If a logical unit has been reserved by any RESERVE command and is
* still reserved by any initiator, all PERSISTENT RESERVE IN and all
* PERSISTENT RESERVE OUT commands shall conflict regardless of
* initiator or service action and shall terminate with a RESERVATION
* CONFLICT status.
*/
if (cmd->se_dev->dev_flags & DF_SPC2_RESERVATIONS) {
pr_err("Received PERSISTENT_RESERVE CDB while legacy"
" SPC-2 reservation is held, returning"
" RESERVATION_CONFLICT\n");
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
return -EINVAL;
}
switch (cmd->t_task_cdb[1] & 0x1f) {
case PRI_READ_KEYS:
ret = core_scsi3_pri_read_keys(cmd);
break;
case PRI_READ_RESERVATION:
ret = core_scsi3_pri_read_reservation(cmd);
break;
case PRI_REPORT_CAPABILITIES:
ret = core_scsi3_pri_report_capabilities(cmd);
break;
case PRI_READ_FULL_STATUS:
ret = core_scsi3_pri_read_full_status(cmd);
break;
default:
pr_err("Unknown PERSISTENT_RESERVE_IN service"
" action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
ret = -EINVAL;
break;
}
if (!ret)
target_complete_cmd(cmd, GOOD);
return ret;
}
static int core_pt_reservation_check(struct se_cmd *cmd, u32 *pr_res_type)
{
return 0;
}
static int core_pt_seq_non_holder(
struct se_cmd *cmd,
unsigned char *cdb,
u32 pr_reg_type)
{
return 0;
}
int core_setup_reservations(struct se_device *dev, int force_pt)
{
struct se_subsystem_dev *su_dev = dev->se_sub_dev;
struct t10_reservation *rest = &su_dev->t10_pr;
/*
* If this device is from Target_Core_Mod/pSCSI, use the reservations
* of the Underlying SCSI hardware. In Linux/SCSI terms, this can
* cause a problem because libata and some SATA RAID HBAs appear
* under Linux/SCSI, but to emulate reservations themselves.
*/
if (((dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) &&
!(dev->se_sub_dev->se_dev_attrib.emulate_reservations)) || force_pt) {
rest->res_type = SPC_PASSTHROUGH;
rest->pr_ops.t10_reservation_check = &core_pt_reservation_check;
rest->pr_ops.t10_seq_non_holder = &core_pt_seq_non_holder;
pr_debug("%s: Using SPC_PASSTHROUGH, no reservation"
" emulation\n", dev->transport->name);
return 0;
}
/*
* If SPC-3 or above is reported by real or emulated struct se_device,
* use emulated Persistent Reservations.
*/
if (dev->transport->get_device_rev(dev) >= SCSI_3) {
rest->res_type = SPC3_PERSISTENT_RESERVATIONS;
rest->pr_ops.t10_reservation_check = &core_scsi3_pr_reservation_check;
rest->pr_ops.t10_seq_non_holder = &core_scsi3_pr_seq_non_holder;
pr_debug("%s: Using SPC3_PERSISTENT_RESERVATIONS"
" emulation\n", dev->transport->name);
} else {
rest->res_type = SPC2_RESERVATIONS;
rest->pr_ops.t10_reservation_check = &core_scsi2_reservation_check;
rest->pr_ops.t10_seq_non_holder =
&core_scsi2_reservation_seq_non_holder;
pr_debug("%s: Using SPC2_RESERVATIONS emulation\n",
dev->transport->name);
}
return 0;
}