[ 3.5.y.z extended stable ] Patch "target/file: Bump FD_MAX_SECTORS to 2048 to handle 1M sized" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    target/file: Bump FD_MAX_SECTORS to 2048 to handle 1M sized

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 737363b69e6dbce4f388a8c92ca543d0dee4d0f7 Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab at linux-iscsi.org>
Date: Mon, 18 Mar 2013 13:15:57 -0700
Subject: [PATCH] target/file: Bump FD_MAX_SECTORS to 2048 to handle 1M sized
 I/Os

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 at netikka.fi>
Signed-off-by: Nicholas Bellinger <nab at linux-iscsi.org>
Luis Henriques <luis.henriques at canonical.com>
---
 drivers/target/target_core_file.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/target/target_core_file.h b/drivers/target/target_core_file.h
index 876ae53..291f66e 100644
--- 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
--
1.8.1.2