This is a note to let you know that I've just added the patch titled
target/file: Bump FD_MAX_SECTORS to 2048 to handle 1M sized I/Os
to the 3.8-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-file-bump-fd_max_sectors-to-2048-to-handle-1m-sized-i-os.patch
and it can be found in the queue-3.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f002a24388cc460c8a9be7d446a9871f7c9d52b6 Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Date: Mon, 18 Mar 2013 13:15:57 -0700
Subject: target/file: Bump FD_MAX_SECTORS to 2048 to handle 1M sized I/Os
From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
commit f002a24388cc460c8a9be7d446a9871f7c9d52b6 upstream.
This patch bumps the default FILEIO backend FD_MAX_SECTORS value from
1024 -> 2048 in order to allow block_size=512 to handle 1M sized I/Os.
The current default rejects I/Os larger than 512K in sbc_parse_cdb():
[12015.915146] SCSI OP 2ah with too big sectors 1347 exceeds backend
hw_max_sectors: 1024
[12015.977744] SCSI OP 2ah with too big sectors 2048 exceeds backend
hw_max_sectors: 1024
This issue is present in >= v3.5 based kernels, introduced after the
removal of se_task logic.
Reported-by: Viljami Ilola <azmulx@xxxxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/target/target_core_file.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/target/target_core_file.h
+++ b/drivers/target/target_core_file.h
@@ -7,7 +7,7 @@
#define FD_DEVICE_QUEUE_DEPTH 32
#define FD_MAX_DEVICE_QUEUE_DEPTH 128
#define FD_BLOCKSIZE 512
-#define FD_MAX_SECTORS 1024
+#define FD_MAX_SECTORS 2048
#define RRF_EMULATE_CDB 0x01
#define RRF_GOT_LBA 0x02
Patches currently in stable-queue which might be from nab@xxxxxxxxxxxxxxx are
queue-3.8/target-iscsi-fix-mutual-chap-auth-on-big-endian-arches.patch
queue-3.8/target-file-bump-fd_max_sectors-to-2048-to-handle-1m-sized-i-os.patch
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