This is a note to let you know that I've just added the patch titled
target: Allow Write Exclusive non-reservation holders to READ
to the 3.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
target-allow-write-exclusive-non-reservation-holders-to-read.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1ecc7586922662e3ca2f3f0c3f17fec8749fc621 Mon Sep 17 00:00:00 2001
From: Lee Duncan <lduncan@xxxxxxxx>
Date: Mon, 5 Jan 2015 10:49:44 -0800
Subject: target: Allow Write Exclusive non-reservation holders to READ
From: Lee Duncan <lduncan@xxxxxxxx>
commit 1ecc7586922662e3ca2f3f0c3f17fec8749fc621 upstream.
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@xxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/target/target_core_pr.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
--- a/drivers/target/target_core_pr.c
+++ b/drivers/target/target_core_pr.c
@@ -518,6 +518,18 @@ static int core_scsi3_pr_seq_non_holder(
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;
+ }
}
pr_debug("%s Conflict for %sregistered nexus %s CDB: 0x%2x"
" for %s reservation\n", transport_dump_cmd_direction(cmd),
Patches currently in stable-queue which might be from lduncan@xxxxxxxx are
queue-3.10/target-allow-write-exclusive-non-reservation-holders-to-read.patch
queue-3.10/target-allow-allregistrants-to-re-reserve-existing-reservation.patch
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