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Commit e4b87837 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

sd: implement unmapping Write Zeroes 



Try to use a write same with unmap bit variant if the device supports it
and the caller allows for it.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: default avatarHannes Reinecke <hare@suse.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 34045129

drivers/scsi/sd.c

+9 −0
Original line number Diff line number Diff line
@@ -803,6 +803,15 @@ static int sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd) 
	u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);

	u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);



	if (!(rq->cmd_flags & REQ_NOUNMAP)) {

		switch (sdkp->provisioning_mode) {

		case SD_LBP_WS16:

			return sd_setup_write_same16_cmnd(cmd, true);

		case SD_LBP_WS10:

			return sd_setup_write_same10_cmnd(cmd, true);

		}

	}



	if (sdp->no_write_same)

		return BLKPREP_INVALID;

	if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff)