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authorMartin K. Petersen <martin.petersen@oracle.com>2012-09-18 12:19:32 -0400
committerJames Bottomley <JBottomley@Parallels.com>2012-11-13 22:45:42 -0800
commit5db44863b6ebbb400c5e61d56ebe8f21ef48b1bd (patch)
treea352bab202b6cb40f234bd2fd306b54776543e8b /drivers/firewire
parent26e85fcd15f68b57d9ba645cd3591117a8ac0e05 (diff)
downloadlinaro-lsk-5db44863b6ebbb400c5e61d56ebe8f21ef48b1bd.tar.gz
[SCSI] sd: Implement support for WRITE SAME
Implement support for WRITE SAME(10) and WRITE SAME(16) in the SCSI disk driver. - We set the default maximum to 0xFFFF because there are several devices out there that only support two-byte block counts even with WRITE SAME(16). We only enable transfers bigger than 0xFFFF if the device explicitly reports MAXIMUM WRITE SAME LENGTH in the BLOCK LIMITS VPD. - max_write_same_blocks can be overriden per-device basis in sysfs. - The UNMAP discovery heuristics remain unchanged but the discard limits are tweaked to match the "real" WRITE SAME commands. - In the error handling logic we now distinguish between WRITE SAME with and without UNMAP set. The discovery process heuristics are: - If the device reports a SCSI level of SPC-3 or greater we'll issue READ SUPPORTED OPERATION CODES to find out whether WRITE SAME(16) is supported. If that's the case we will use it. - If the device supports the block limits VPD and reports a MAXIMUM WRITE SAME LENGTH bigger than 0xFFFF we will use WRITE SAME(16). - Otherwise we will use WRITE SAME(10) unless the target LBA is beyond 0xFFFFFFFF or the block count exceeds 0xFFFF. - no_write_same is set for ATA, FireWire and USB. Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Mike Snitzer <snitzer@redhat.com> Reviewed-by: Jeff Garzik <jgarzik@redhat.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/firewire')
-rw-r--r--drivers/firewire/sbp2.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/firewire/sbp2.c b/drivers/firewire/sbp2.c
index f82e9d4295d..bb1b392f5cd 100644
--- a/drivers/firewire/sbp2.c
+++ b/drivers/firewire/sbp2.c
@@ -1547,6 +1547,7 @@ static int sbp2_scsi_slave_configure(struct scsi_device *sdev)
sdev->use_10_for_rw = 1;
sdev->no_report_opcodes = 1;
+ sdev->no_write_same = 1;
if (sbp2_param_exclusive_login)
sdev->manage_start_stop = 1;