Commit 1ecc7586 authored Jan 05, 2015 by Lee Duncan Committed by Nicholas Bellinger Jan 09, 2015

target: Allow Write Exclusive non-reservation holders to READ



For PGR reservation of type Write Exclusive Access, allow all non
reservation holding I_T nexuses with active registrations to READ
from the device.

This addresses a bug where active registrations that attempted
to READ would result in an reservation conflict.

Signed-off-by: Lee Duncan <lduncan@suse.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

parent 7216dc07

drivers/target/target_core_pr.c

+12 −0

Original line number	Diff line number	Diff line
		@@ -526,6 +526,18 @@ static int core_scsi3_pr_seq_non_holder(
		" reservation\n", cdb[0],
		core_scsi3_pr_dump_type(pr_reg_type));

		return 0;
		}
		} else if (we && registered_nexus) {
		/*
		* Reads are allowed for Write Exclusive locks
		* from all registrants.
		*/
		if (cmd->data_direction == DMA_FROM_DEVICE) {
		pr_debug("Allowing READ CDB: 0x%02x for %s"
		" reservation\n", cdb[0],
		core_scsi3_pr_dump_type(pr_reg_type));

		return 0;
		}
		}