This would be actually strange and error prone. If truncate() nowadays will fail, there is something fatally wrong. Let's check for that during the actual work.
The only fallback case is when the file is not zero initialized. In this case we should switch to preallocation via fallocate(). Signed-off-by: Denis V. Lunev <d...@openvz.org> CC: Markus Armbruster <arm...@redhat.com> CC: Kevin Wolf <kw...@redhat.com> CC: Max Reitz <mre...@redhat.com> CC: Stefan Hajnoczi <stefa...@redhat.com> --- block/parallels.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/block/parallels.c b/block/parallels.c index 6794e53c0b..e1e06d23cc 100644 --- a/block/parallels.c +++ b/block/parallels.c @@ -703,9 +703,7 @@ static int parallels_open(BlockDriverState *bs, QDict *options, int flags, goto fail_options; } - if (!(flags & BDRV_O_RESIZE) || !bdrv_has_zero_init(bs->file->bs) || - bdrv_truncate(bs->file, bdrv_getlength(bs->file->bs), - PREALLOC_MODE_OFF, NULL) != 0) { + if (!bdrv_has_zero_init(bs->file->bs)) { s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE; } -- 2.11.0