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parallels: drop check that bdrv_truncate() is working 

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 <den@openvz.org>
CC: Markus Armbruster <armbru@redhat.com>
CC: Kevin Wolf <kwolf@redhat.com>
CC: Max Reitz <mreitz@redhat.com>
CC: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Denis V. Lunev 2017-08-04 18:10:13 +03:00 committed by Kevin Wolf
parent d8b83e37c3
commit e5e6268348
1 changed files with 1 additions and 3 deletions
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4
block/parallels.c
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@ -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;
}