Commit d977f437 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Nicholas Bellinger
Browse files

target: simplify reservations code 



We do not support host-level reservations for the pscsi backend, and all
virtual backends are newere than SCSI-2, so just make the combined
SPC-3 + SCSI-2 support the only supported variant and kill the switches
for the different implementations, given that this code handles the no-op
version just fine.

(hch: Update DRF_SPC2_RESERVATIONS lock usage)

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent 019c4ca6

drivers/target/target_core_configfs.c

+52 −106
Original line number Diff line number Diff line
@@ -970,13 +970,8 @@ static struct target_core_dev_pr_attribute target_core_dev_pr_##_name = \ 
	__CONFIGFS_EATTR_RO(_name,					\

	target_core_dev_pr_show_attr_##_name);



/*

 * res_holder

 */

static ssize_t target_core_dev_pr_show_spc3_res(

	struct se_device *dev,

	char *page,

	ssize_t *len)

static ssize_t target_core_dev_pr_show_spc3_res(struct se_device *dev,

		char *page)

{

	struct se_node_acl *se_nacl;

	struct t10_pr_registration *pr_reg;
@@ -985,68 +980,52 @@ static ssize_t target_core_dev_pr_show_spc3_res( 


	memset(i_buf, 0, PR_REG_ISID_ID_LEN);



	spin_lock(&dev->dev_reservation_lock);

	pr_reg = dev->dev_pr_res_holder;

	if (!pr_reg) {

		*len += sprintf(page + *len, "No SPC-3 Reservation holder\n");

		spin_unlock(&dev->dev_reservation_lock);

		return *len;

	}

	if (!pr_reg)

		return sprintf(page, "No SPC-3 Reservation holder\n");



	se_nacl = pr_reg->pr_reg_nacl;

	prf_isid = core_pr_dump_initiator_port(pr_reg, &i_buf[0],

				PR_REG_ISID_ID_LEN);



	*len += sprintf(page + *len, "SPC-3 Reservation: %s Initiator: %s%s\n",

	return sprintf(page, "SPC-3 Reservation: %s Initiator: %s%s\n",

		se_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),

		se_nacl->initiatorname, (prf_isid) ? &i_buf[0] : "");

	spin_unlock(&dev->dev_reservation_lock);



	return *len;

}



static ssize_t target_core_dev_pr_show_spc2_res(

	struct se_device *dev,

	char *page,

	ssize_t *len)

static ssize_t target_core_dev_pr_show_spc2_res(struct se_device *dev,

		char *page)

{

	struct se_node_acl *se_nacl;

	ssize_t len;



	spin_lock(&dev->dev_reservation_lock);

	se_nacl = dev->dev_reserved_node_acl;

	if (!se_nacl) {

		*len += sprintf(page + *len, "No SPC-2 Reservation holder\n");

		spin_unlock(&dev->dev_reservation_lock);

		return *len;

	}

	*len += sprintf(page + *len, "SPC-2 Reservation: %s Initiator: %s\n",

	if (se_nacl) {

		len = sprintf(page,

			      "SPC-2 Reservation: %s Initiator: %s\n",

			      se_nacl->se_tpg->se_tpg_tfo->get_fabric_name(),

			      se_nacl->initiatorname);

	spin_unlock(&dev->dev_reservation_lock);



	return *len;

	} else {

		len = sprintf(page, "No SPC-2 Reservation holder\n");

	}

	return len;

}



static ssize_t target_core_dev_pr_show_attr_res_holder(struct se_device *dev,

		char *page)

{

	ssize_t len = 0;

	int ret;



	switch (dev->t10_pr.res_type) {

	case SPC3_PERSISTENT_RESERVATIONS:

		target_core_dev_pr_show_spc3_res(dev, page, &len);

		break;

	case SPC2_RESERVATIONS:

		target_core_dev_pr_show_spc2_res(dev, page, &len);

		break;

	case SPC_PASSTHROUGH:

		len += sprintf(page+len, "Passthrough\n");

		break;

	default:

		len += sprintf(page+len, "Unknown\n");

		break;

	}

	if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)

		return sprintf(page, "Passthrough\n");



	return len;

	spin_lock(&dev->dev_reservation_lock);

	if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)

		ret = target_core_dev_pr_show_spc2_res(dev, page);

	else

		ret = target_core_dev_pr_show_spc3_res(dev, page);

	spin_unlock(&dev->dev_reservation_lock);

	return ret;

}



SE_DEV_PR_ATTR_RO(res_holder);
@@ -1054,31 +1033,20 @@ SE_DEV_PR_ATTR_RO(res_holder); 
static ssize_t target_core_dev_pr_show_attr_res_pr_all_tgt_pts(

		struct se_device *dev, char *page)

{

	struct t10_pr_registration *pr_reg;

	ssize_t len = 0;



	if (dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)

		return len;



	spin_lock(&dev->dev_reservation_lock);

	pr_reg = dev->dev_pr_res_holder;

	if (!pr_reg) {

	if (!dev->dev_pr_res_holder) {

		len = sprintf(page, "No SPC-3 Reservation holder\n");

		spin_unlock(&dev->dev_reservation_lock);

		return len;

	}

	/*

	 * See All Target Ports (ALL_TG_PT) bit in spcr17, section 6.14.3

	 * Basic PERSISTENT RESERVER OUT parameter list, page 290

	 */

	if (pr_reg->pr_reg_all_tg_pt)

	} else if (dev->dev_pr_res_holder->pr_reg_all_tg_pt) {

		len = sprintf(page, "SPC-3 Reservation: All Target"

			" Ports registration\n");

	else

	} else {

		len = sprintf(page, "SPC-3 Reservation: Single"

			" Target Port registration\n");

	spin_unlock(&dev->dev_reservation_lock);

	}



	spin_unlock(&dev->dev_reservation_lock);

	return len;

}
@@ -1087,9 +1055,6 @@ SE_DEV_PR_ATTR_RO(res_pr_all_tgt_pts); 
static ssize_t target_core_dev_pr_show_attr_res_pr_generation(

		struct se_device *dev, char *page)

{

	if (dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)

		return 0;



	return sprintf(page, "0x%08x\n", dev->t10_pr.pr_generation);

}
@@ -1108,16 +1073,13 @@ static ssize_t target_core_dev_pr_show_attr_res_pr_holder_tg_port( 
	struct target_core_fabric_ops *tfo;

	ssize_t len = 0;



	if (dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)

		return len;



	spin_lock(&dev->dev_reservation_lock);

	pr_reg = dev->dev_pr_res_holder;

	if (!pr_reg) {

		len = sprintf(page, "No SPC-3 Reservation holder\n");

		spin_unlock(&dev->dev_reservation_lock);

		return len;

		goto out_unlock;

	}



	se_nacl = pr_reg->pr_reg_nacl;

	se_tpg = se_nacl->se_tpg;

	lun = pr_reg->pr_reg_tg_pt_lun;
@@ -1131,8 +1093,9 @@ static ssize_t target_core_dev_pr_show_attr_res_pr_holder_tg_port( 
		" %s Logical Unit: %u\n", lun->lun_sep->sep_rtpi,

		tfo->get_fabric_name(), tfo->tpg_get_tag(se_tpg),

		tfo->get_fabric_name(), lun->unpacked_lun);

	spin_unlock(&dev->dev_reservation_lock);



out_unlock:

	spin_unlock(&dev->dev_reservation_lock);

	return len;

}
@@ -1148,9 +1111,6 @@ static ssize_t target_core_dev_pr_show_attr_res_pr_registered_i_pts( 
	ssize_t len = 0;

	int reg_count = 0, prf_isid;



	if (dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)

		return len;



	len += sprintf(page+len, "SPC-3 PR Registrations:\n");



	spin_lock(&dev->t10_pr.registration_lock);
@@ -1190,20 +1150,16 @@ static ssize_t target_core_dev_pr_show_attr_res_pr_type( 
	struct t10_pr_registration *pr_reg;

	ssize_t len = 0;



	if (dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)

		return len;



	spin_lock(&dev->dev_reservation_lock);

	pr_reg = dev->dev_pr_res_holder;

	if (!pr_reg) {

		len = sprintf(page, "No SPC-3 Reservation holder\n");

		spin_unlock(&dev->dev_reservation_lock);

		return len;

	}

	if (pr_reg) {

		len = sprintf(page, "SPC-3 Reservation Type: %s\n",

			core_scsi3_pr_dump_type(pr_reg->pr_res_type));

	spin_unlock(&dev->dev_reservation_lock);

	} else {

		len = sprintf(page, "No SPC-3 Reservation holder\n");

	}



	spin_unlock(&dev->dev_reservation_lock);

	return len;

}
@@ -1212,24 +1168,12 @@ SE_DEV_PR_ATTR_RO(res_pr_type); 
static ssize_t target_core_dev_pr_show_attr_res_type(

		struct se_device *dev, char *page)

{

	ssize_t len = 0;



	switch (dev->t10_pr.res_type) {

	case SPC3_PERSISTENT_RESERVATIONS:

		len = sprintf(page, "SPC3_PERSISTENT_RESERVATIONS\n");

		break;

	case SPC2_RESERVATIONS:

		len = sprintf(page, "SPC2_RESERVATIONS\n");

		break;

	case SPC_PASSTHROUGH:

		len = sprintf(page, "SPC_PASSTHROUGH\n");

		break;

	default:

		len = sprintf(page, "UNKNOWN\n");

		break;

	}



	return len;

	if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)

		return sprintf(page, "SPC_PASSTHROUGH\n");

	else if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)

		return sprintf(page, "SPC2_RESERVATIONS\n");

	else

		return sprintf(page, "SPC3_PERSISTENT_RESERVATIONS\n");

}



SE_DEV_PR_ATTR_RO(res_type);
@@ -1237,7 +1181,7 @@ SE_DEV_PR_ATTR_RO(res_type); 
static ssize_t target_core_dev_pr_show_attr_res_aptpl_active(

		struct se_device *dev, char *page)

{

	if (dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)

	if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)

		return 0;



	return sprintf(page, "APTPL Bit Status: %s\n",
@@ -1252,7 +1196,7 @@ SE_DEV_PR_ATTR_RO(res_aptpl_active); 
static ssize_t target_core_dev_pr_show_attr_res_aptpl_metadata(

		struct se_device *dev, char *page)

{

	if (dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)

	if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)

		return 0;



	return sprintf(page, "Ready to process PR APTPL metadata..\n");
@@ -1299,7 +1243,9 @@ static ssize_t target_core_dev_pr_store_attr_res_aptpl_metadata( 
	u16 port_rpti = 0, tpgt = 0;

	u8 type = 0, scope;



	if (dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)

	if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)

		return 0;

	if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)

		return 0;



	if (dev->export_count) {

drivers/target/target_core_device.c

+0 −3
Original line number Diff line number Diff line
@@ -1398,7 +1398,6 @@ struct se_device *target_alloc_device(struct se_hba *hba, const char *name) 
	dev->dev_attrib.emulate_tas = DA_EMULATE_TAS;

	dev->dev_attrib.emulate_tpu = DA_EMULATE_TPU;

	dev->dev_attrib.emulate_tpws = DA_EMULATE_TPWS;

	dev->dev_attrib.emulate_reservations = DA_EMULATE_RESERVATIONS;

	dev->dev_attrib.emulate_alua = DA_EMULATE_ALUA;

	dev->dev_attrib.enforce_pr_isids = DA_ENFORCE_PR_ISIDS;

	dev->dev_attrib.is_nonrot = DA_IS_NONROT;
@@ -1447,8 +1446,6 @@ int target_configure_device(struct se_device *dev) 
	dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);

	dev->creation_time = get_jiffies_64();



	core_setup_reservations(dev);



	ret = core_setup_alua(dev);

	if (ret)

		goto out;

drivers/target/target_core_pr.c

+63 −129
Original line number Diff line number Diff line
@@ -68,49 +68,32 @@ int core_pr_dump_initiator_port( 
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)

static int target_scsi2_reservation_check(struct se_cmd *cmd)

{

	switch (cdb[0]) {

	struct se_device *dev = cmd->se_dev;

	struct se_session *sess = cmd->se_sess;



	switch (cmd->t_task_cdb[0]) {

	case INQUIRY:

	case RELEASE:

	case RELEASE_10:

		return 0;

	default:

		return 1;

	}



	return 1;

		break;

	}



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)

	if (!dev->dev_reserved_node_acl || !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_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID)) {

		spin_unlock(&dev->dev_reservation_lock);

		return 0;

	if (dev->dev_reserved_node_acl != sess->se_node_acl)

		return -EBUSY;



	if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS_WITH_ISID) {

		if (dev->dev_res_bin_isid != sess->sess_bin_isid)

			return -EBUSY;

	}

	ret = (dev->dev_res_bin_isid == sess->sess_bin_isid) ? 0 : -EINVAL;

	spin_unlock(&dev->dev_reservation_lock);



	return ret;

	return 0;

}



static struct t10_pr_registration *core_scsi3_locate_pr_reg(struct se_device *,
@@ -123,12 +106,8 @@ static int target_check_scsi2_reservation_conflict(struct se_cmd *cmd) 
	struct se_device *dev = cmd->se_dev;

	struct t10_pr_registration *pr_reg;

	struct t10_reservation *pr_tmpl = &dev->t10_pr;

	int crh = (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) {
@@ -319,9 +298,9 @@ out: 
 */

static int core_scsi3_pr_seq_non_holder(

	struct se_cmd *cmd,

	unsigned char *cdb,

	u32 pr_reg_type)

{

	unsigned char *cdb = cmd->t_task_cdb;

	struct se_dev_entry *se_deve;

	struct se_session *se_sess = cmd->se_sess;

	int other_cdb = 0, ignore_reg;
@@ -330,17 +309,11 @@ static int core_scsi3_pr_seq_non_holder( 
	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_reservation_flags & DRF_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().

	 * non-matching ISIDs in target_scsi3_pr_reservation_check().

	 */

	ignore_reg = (pr_reg_type & 0x80000000);

	if (ignore_reg)
@@ -563,6 +536,36 @@ static int core_scsi3_pr_seq_non_holder( 
	return 1; /* Conflict by default */

}



static int target_scsi3_pr_reservation_check(struct se_cmd *cmd)

{

	struct se_device *dev = cmd->se_dev;

	struct se_session *sess = cmd->se_sess;

	u32 pr_reg_type;



	if (!dev->dev_pr_res_holder)

		return 0;



	pr_reg_type = dev->dev_pr_res_holder->pr_res_type;

	cmd->pr_res_key = dev->dev_pr_res_holder->pr_res_key;

	if (dev->dev_pr_res_holder->pr_reg_nacl != sess->se_node_acl)

		goto check_nonholder;



	if (dev->dev_pr_res_holder->isid_present_at_reg) {

		if (dev->dev_pr_res_holder->pr_reg_bin_isid !=

		    sess->sess_bin_isid) {

			pr_reg_type |= 0x80000000;

			goto check_nonholder;

		}

	}



	return 0;



check_nonholder:

	if (core_scsi3_pr_seq_non_holder(cmd, pr_reg_type))

		return -EBUSY;

	return 0;

}



static u32 core_scsi3_pr_generation(struct se_device *dev)

{

	u32 prg;
@@ -583,50 +586,6 @@ static u32 core_scsi3_pr_generation(struct se_device *dev) 
	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_reservation_flags & DRF_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,
@@ -998,7 +957,7 @@ int core_scsi3_check_aptpl_registration( 
	struct se_node_acl *nacl = lun_acl->se_lun_nacl;

	struct se_dev_entry *deve = nacl->device_list[lun_acl->mapped_lun];



	if (dev->t10_pr.res_type != SPC3_PERSISTENT_RESERVATIONS)

	if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)

		return 0;



	return __core_scsi3_check_aptpl_registration(dev, tpg, lun,
@@ -4343,49 +4302,24 @@ int target_scsi3_emulate_pr_in(struct se_cmd *cmd) 
	return ret;

}



static int core_pt_reservation_check(struct se_cmd *cmd, u32 *pr_res_type)

int target_check_reservation(struct se_cmd *cmd)

{

	return 0;

}

	struct se_device *dev = cmd->se_dev;

	int ret;



static int core_pt_seq_non_holder(

	struct se_cmd *cmd,

	unsigned char *cdb,

	u32 pr_reg_type)

{

	if (!cmd->se_sess)

		return 0;

	if (dev->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE)

		return 0;

	if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)

		return 0;

}



void core_setup_reservations(struct se_device *dev)

{

	struct t10_reservation *rest = &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->se_hba->hba_flags & HBA_FLAGS_INTERNAL_USE) ||

	    (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV &&

	     !dev->dev_attrib.emulate_reservations)) {

		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);

	} else 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);

	}

	spin_lock(&dev->dev_reservation_lock);

	if (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)

		ret = target_scsi2_reservation_check(cmd);

	else

		ret = target_scsi3_pr_reservation_check(cmd);

	spin_unlock(&dev->dev_reservation_lock);



	return ret;

}

drivers/target/target_core_pr.h

+1 −1
Original line number Diff line number Diff line
@@ -63,6 +63,6 @@ extern unsigned char *core_scsi3_pr_dump_type(int); 


extern int target_scsi3_emulate_pr_in(struct se_cmd *);

extern int target_scsi3_emulate_pr_out(struct se_cmd *);

extern void core_setup_reservations(struct se_device *);

extern int target_check_reservation(struct se_cmd *cmd);



#endif /* TARGET_CORE_PR_H */

drivers/target/target_core_spc.c

+4 −15
Original line number Diff line number Diff line
@@ -1003,14 +1003,12 @@ int spc_parse_cdb(struct se_cmd *cmd, unsigned int *size) 
		*size = (cdb[7] << 8) + cdb[8];

		break;

	case PERSISTENT_RESERVE_IN:

		if (dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)

			cmd->execute_cmd = target_scsi3_emulate_pr_in;

		*size = (cdb[7] << 8) + cdb[8];

		cmd->execute_cmd = target_scsi3_emulate_pr_in;

		break;

	case PERSISTENT_RESERVE_OUT:

		if (dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)

			cmd->execute_cmd = target_scsi3_emulate_pr_out;

		*size = (cdb[7] << 8) + cdb[8];

		cmd->execute_cmd = target_scsi3_emulate_pr_out;

		break;

	case RELEASE:

	case RELEASE_10:
@@ -1019,7 +1017,6 @@ int spc_parse_cdb(struct se_cmd *cmd, unsigned int *size) 
		else

			*size = cmd->data_length;



		if (dev->t10_pr.res_type != SPC_PASSTHROUGH)

		cmd->execute_cmd = target_scsi2_reservation_release;

		break;

	case RESERVE:
@@ -1033,14 +1030,6 @@ int spc_parse_cdb(struct se_cmd *cmd, unsigned int *size) 
		else

			*size = cmd->data_length;



		/*

		 * Setup the legacy emulated handler for SPC-2 and

		 * >= SPC-3 compatible reservation handling (CRH=1)

		 * Otherwise, we assume the underlying SCSI logic is

		 * is running in SPC_PASSTHROUGH, and wants reservations

		 * emulation disabled.

		 */

		if (dev->t10_pr.res_type != SPC_PASSTHROUGH)

		cmd->execute_cmd = target_scsi2_reservation_reserve;

		break;

	case REQUEST_SENSE:

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