diff options
| author | Eric Blake <eblake@redhat.com> | 2016-06-01 15:10:01 -0600 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2016-06-08 10:21:08 +0200 |
| commit | 8b1847445159ff6c12e7a24f04dc989ff97e34d4 (patch) | |
| tree | a3c61bf77b983bcbb04282d08cee881baf6bbb8e | |
| parent | ebb718a5c7240f6ffb308e0d0b67a92c3b63b91c (diff) | |
iscsi: Use block size as minimum zero/discard alignment
If hardware does not advertise a minimum zero/discard
alignment, we still want to guarantee that the block layer
will align requests to our blocks, rather than the arbitrary
512-byte BDRV sector size.
Signed-off-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
| -rw-r--r-- | block/iscsi.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/block/iscsi.c b/block/iscsi.c index e7d5f7b0c3..94f9974f10 100644 --- a/block/iscsi.c +++ b/block/iscsi.c @@ -1711,6 +1711,8 @@ static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp) } bs->bl.discard_alignment = sector_limits_lun2qemu(iscsilun->bl.opt_unmap_gran, iscsilun); + } else { + bs->bl.discard_alignment = iscsilun->block_size >> BDRV_SECTOR_BITS; } if (iscsilun->bl.max_ws_len < 0xffffffff) { @@ -1720,6 +1722,9 @@ static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp) if (iscsilun->lbp.lbpws) { bs->bl.write_zeroes_alignment = sector_limits_lun2qemu(iscsilun->bl.opt_unmap_gran, iscsilun); + } else { + bs->bl.write_zeroes_alignment = + iscsilun->block_size >> BDRV_SECTOR_BITS; } bs->bl.opt_transfer_length = sector_limits_lun2qemu(iscsilun->bl.opt_xfer_len, iscsilun); |