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Commit e7810c2d authored by Nicholas Bellinger's avatar Nicholas Bellinger
Browse files

target: Allow READ_CAPACITY opcode in ALUA Standby access state 



This patch allows READ_CAPACITY + SAI_READ_CAPACITY_16 opcode
processing to occur while the associated ALUA group is in Standby
access state.

This is required to avoid host side LUN probe failures during the
initial scan if an ALUA group has already implicitly changed into
Standby access state.

This addresses a bug reported by Chris + Philip using dm-multipath
+ ESX hosts configured with ALUA multipath.

Reported-by: default avatarChris Boot <crb@tiger-computing.co.uk>
Reported-by: default avatarPhilip Gaw <pgaw@darktech.org.uk>
Cc: Chris Boot <crb@tiger-computing.co.uk>
Cc: Philip Gaw <pgaw@darktech.org.uk>
Cc: Hannes Reinecke <hare@suse.de>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarNicholas Bellinger <nab@linux-iscsi.org>
parent 2363d196

drivers/target/target_core_alua.c

+9 −0
Original line number Diff line number Diff line
@@ -576,7 +576,16 @@ static inline int core_alua_state_standby( 
	case REPORT_LUNS:

	case RECEIVE_DIAGNOSTIC:

	case SEND_DIAGNOSTIC:

	case READ_CAPACITY:

		return 0;

	case SERVICE_ACTION_IN:

		switch (cdb[1] & 0x1f) {

		case SAI_READ_CAPACITY_16:

			return 0;

		default:

			set_ascq(cmd, ASCQ_04H_ALUA_TG_PT_STANDBY);

			return 1;

		}

	case MAINTENANCE_IN:

		switch (cdb[1] & 0x1f) {

		case MI_REPORT_TARGET_PGS: