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block: Don't enforce 512 byte minimum alignment

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If block drivers say that they can do an alignment < 512 bytes, let's
just suppose they mean it. raw-posix used to be an offender with respect
to this, but it can actually deal with byte-aligned requests now.

The default is still 512 bytes for any drivers that only implement
sector-based interfaces, but it is 1 now for drivers that implement
.bdrv_co_preadv.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Kevin Wolf 2016-06-03 16:45:44 +02:00
parent 9d52aa3c38
commit 23b0d9fb1d
2 changed files with 4 additions and 6 deletions
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2
block.c
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@ -937,7 +937,7 @@ static int bdrv_open_common(BlockDriverState *bs, BdrvChild *file,
goto fail_opts;
}
bs->request_alignment = 512;
bs->request_alignment = drv->bdrv_co_preadv ? 1 : 512;
bs->zero_beyond_eof = true;
bs->read_only = !(bs->open_flags & BDRV_O_RDWR);