tree 23e889a930b66d402e796a1e173ed6375c5f0e1c
parent e6bd931284b4b9bc17a2995257a0769370bc5202
author Martin K. Petersen <martin.petersen@oracle.com> 1491412885 +0200
committer Jens Axboe <axboe@fb.com> 1491672338 -0600

scsi: sd: Remove LBPRZ dependency for discards

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>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>