linux-kernel - [ 55/98] target/file: Bump FD_MAX_SECTORS to 2048 to handle 1M sized I/Os

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Message-Id: <20130326224248.252396386@linuxfoundation.org>
Date:	Tue, 26 Mar 2013 15:42:44 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Viljami Ilola <azmulx@...ikka.fi>,
	Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: [ 55/98] target/file: Bump FD_MAX_SECTORS to 2048 to handle 1M sized I/Os

3.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Nicholas Bellinger <nab@...ux-iscsi.org>

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@...ikka.fi>
Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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


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