[ 048/171 ] target/file: Bump FD_MAX_SECTORS to 2048 to handle 1M sized I/Os

From: Steven Rostedt
Date: Thu Apr 11 2013 - 16:31:49 EST stable review patch.
If anyone has any objections, please let me know.


From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>

[ Upstream commit f002a24388cc460c8a9be7d446a9871f7c9d52b6 ]

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>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
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_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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