On Sat, 2016-03-05 at 18:10 -0500, Martin K. Petersen wrote:
> Commit 397737223c59 ("sd: Make discard granularity match logical block
> size when LBPRZ=1") accidentally set the granularity to one byte instead
> of one logical block on devices that provide determistic zeroes after
> UNMAP.
>
> Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
> Reported-by: Mike Snitzer <snitzer@xxxxxxxxxx>
> Fixes: 397737223c59e89dca7305feb6528caef8fbef84
> Cc: <stable@xxxxxxxxxxxxxxx> # 4.4+
> ---
> drivers/scsi/sd.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
> index d749da765df1..5a5457ac9cdb 100644
> --- a/drivers/scsi/sd.c
> +++ b/drivers/scsi/sd.c
> @@ -648,7 +648,7 @@ static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
> */
> if (sdkp->lbprz) {
> q->limits.discard_alignment = 0;
> - q->limits.discard_granularity = 1;
> + q->limits.discard_granularity = logical_block_size;
> } else {
> q->limits.discard_alignment = sdkp->unmap_alignment *
> logical_block_size;
Reviewed-by: Ewan D. Milne <emilne@xxxxxxxxxx>
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