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Commit 617c0e06 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Nicholas Bellinger
Browse files

target: split core_scsi3_emulate_pr 



Split core_scsi2_emulate_crh into one routine each for the
PERSISTENT_RESERVE_IN and PERSISTENT_RESERVE_OUT side.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
parent eacac00c

drivers/target/target_core_pr.c

+35 −27
Original line number Diff line number Diff line
@@ -3734,12 +3734,30 @@ static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb) 
/*

 * See spc4r17 section 6.14 Table 170

 */

static int core_scsi3_emulate_pr_out(struct se_cmd *cmd, unsigned char *cdb)

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;



	/*

	 * 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");

		return PYX_TRANSPORT_RESERVATION_CONFLICT;

	}



	/*

	 * FIXME: A NULL struct se_session pointer means an this is not coming from

	 * a $FABRIC_MOD's nexus, but from internal passthrough ops.
@@ -4185,29 +4203,8 @@ static int core_scsi3_pri_read_full_status(struct se_cmd *cmd) 
	return 0;

}



static int core_scsi3_emulate_pr_in(struct se_cmd *cmd, unsigned char *cdb)

int target_scsi3_emulate_pr_in(struct se_cmd *cmd)

{

	switch (cdb[1] & 0x1f) {

	case PRI_READ_KEYS:

		return core_scsi3_pri_read_keys(cmd);

	case PRI_READ_RESERVATION:

		return core_scsi3_pri_read_reservation(cmd);

	case PRI_REPORT_CAPABILITIES:

		return core_scsi3_pri_report_capabilities(cmd);

	case PRI_READ_FULL_STATUS:

		return core_scsi3_pri_read_full_status(cmd);

	default:

		pr_err("Unknown PERSISTENT_RESERVE_IN service"

			" action: 0x%02x\n", cdb[1] & 0x1f);

		return PYX_TRANSPORT_INVALID_CDB_FIELD;

	}



}



int core_scsi3_emulate_pr(struct se_cmd *cmd)

{

	unsigned char *cdb = &cmd->t_task_cdb[0];

	struct se_device *dev = cmd->se_dev;

	/*

	 * Following spc2r20 5.5.1 Reservations overview:

	 *
@@ -4217,16 +4214,27 @@ int core_scsi3_emulate_pr(struct se_cmd *cmd) 
	 * initiator or service action and shall terminate with a RESERVATION

	 * CONFLICT status.

	 */

	if (dev->dev_flags & DF_SPC2_RESERVATIONS) {

	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");

		return PYX_TRANSPORT_RESERVATION_CONFLICT;

	}



	return (cdb[0] == PERSISTENT_RESERVE_OUT) ?

	       core_scsi3_emulate_pr_out(cmd, cdb) :

	       core_scsi3_emulate_pr_in(cmd, cdb);

	switch (cmd->t_task_cdb[1] & 0x1f) {

	case PRI_READ_KEYS:

		return core_scsi3_pri_read_keys(cmd);

	case PRI_READ_RESERVATION:

		return core_scsi3_pri_read_reservation(cmd);

	case PRI_REPORT_CAPABILITIES:

		return core_scsi3_pri_report_capabilities(cmd);

	case PRI_READ_FULL_STATUS:

		return core_scsi3_pri_read_full_status(cmd);

	default:

		pr_err("Unknown PERSISTENT_RESERVE_IN service"

			" action: 0x%02x\n", cmd->t_task_cdb[1] & 0x1f);

		return PYX_TRANSPORT_INVALID_CDB_FIELD;

	}

}



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

drivers/target/target_core_pr.h

+3 −1
Original line number Diff line number Diff line
@@ -62,7 +62,9 @@ extern void core_scsi3_free_all_registrations(struct se_device *); 
extern unsigned char *core_scsi3_pr_dump_type(int);

extern int core_scsi3_check_cdb_abort_and_preempt(struct list_head *,

						  struct se_cmd *);

extern int core_scsi3_emulate_pr(struct se_cmd *);



extern int target_scsi3_emulate_pr_in(struct se_cmd *cmd);

extern int target_scsi3_emulate_pr_out(struct se_cmd *cmd);

extern int core_setup_reservations(struct se_device *, int);



#endif /* TARGET_CORE_PR_H */

drivers/target/target_core_transport.c

+7 −4
Original line number Diff line number Diff line
@@ -2842,11 +2842,14 @@ static int transport_generic_cmd_sequencer( 
		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;

		break;

	case PERSISTENT_RESERVE_IN:

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

			cmd->transport_emulate_cdb = target_scsi3_emulate_pr_in;

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

		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;

		break;

	case PERSISTENT_RESERVE_OUT:

		cmd->transport_emulate_cdb =

			(su_dev->t10_pr.res_type ==

			 SPC3_PERSISTENT_RESERVATIONS) ?

			core_scsi3_emulate_pr : NULL;

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

			cmd->transport_emulate_cdb = target_scsi3_emulate_pr_out;

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

		cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;

		break;