diff mbox

[27/27] scsi: sd: Remove LBPRZ dependency for discards

Message ID 20170405172125.22600-28-hch@lst.de (mailing list archive)
State New, archived
Headers show

Commit Message

Christoph Hellwig April 5, 2017, 5:21 p.m. UTC 
From: "Martin K. Petersen" <martin.petersen@oracle.com>

Separating discards and zeroout operations allows us to remove the LBPRZ
block zeroing constraints from discards and honor the device preferences
for UNMAP commands.

If supported by the device, we'll also choose UNMAP over one of the
WRITE SAME variants for discards.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/scsi/sd.c | 25 ++++++-------------------
 1 file changed, 6 insertions(+), 19 deletions(-)

Comments

Hannes Reinecke April 6, 2017, 6:18 a.m. UTC | #1 
On 04/05/2017 07:21 PM, Christoph Hellwig wrote:
> From: "Martin K. Petersen" <martin.petersen@oracle.com>
> 
> Separating discards and zeroout operations allows us to remove the LBPRZ
> block zeroing constraints from discards and honor the device preferences
> for UNMAP commands.
> 
> If supported by the device, we'll also choose UNMAP over one of the
> WRITE SAME variants for discards.
> 
> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  drivers/scsi/sd.c | 25 ++++++-------------------
>  1 file changed, 6 insertions(+), 19 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare@suse.com>

Cheers,

Hannes
diff mbox

Patch

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index acf9d17b05d8..8cf34a8e3eea 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -685,24 +685,11 @@  static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
 	unsigned int logical_block_size = sdkp->device->sector_size;
 	unsigned int max_blocks = 0;
 
-	/*
-	 * When LBPRZ is reported, discard alignment and granularity
-	 * must be fixed to the logical block size. Otherwise the block
-	 * layer will drop misaligned portions of the request which can
-	 * lead to data corruption. If LBPRZ is not set, we honor the
-	 * device preference.
-	 */
-	if (sdkp->lbprz) {
-		q->limits.discard_alignment = 0;
-		q->limits.discard_granularity = logical_block_size;
-	} else {
-		q->limits.discard_alignment = sdkp->unmap_alignment *
-			logical_block_size;
-		q->limits.discard_granularity =
-			max(sdkp->physical_block_size,
-			    sdkp->unmap_granularity * logical_block_size);
-	}
-
+	q->limits.discard_alignment =
+		sdkp->unmap_alignment * logical_block_size;
+	q->limits.discard_granularity =
+		max(sdkp->physical_block_size,
+		    sdkp->unmap_granularity * logical_block_size);
 	sdkp->provisioning_mode = mode;
 
 	switch (mode) {
@@ -2842,7 +2829,7 @@  static void sd_read_block_limits(struct scsi_disk *sdkp)
 				sd_config_discard(sdkp, SD_LBP_WS16);
 
 		} else {	/* LBP VPD page tells us what to use */
-			if (sdkp->lbpu && sdkp->max_unmap_blocks && !sdkp->lbprz)
+			if (sdkp->lbpu && sdkp->max_unmap_blocks)
 				sd_config_discard(sdkp, SD_LBP_UNMAP);
 			else if (sdkp->lbpws)
 				sd_config_discard(sdkp, SD_LBP_WS16);