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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: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2017-04-05 19:21:12 +02:00 committed by Jens Axboe
parent 34045129b1
commit e4b878371b
1 changed files with 9 additions and 0 deletions
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9
drivers/scsi/sd.c
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@ -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)