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parallels: wrong call to bdrv_truncate

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Parallels driver should not call bdrv_truncate if the image was opened
in the read-only mode. Without the patch
    qemu-img check harddisk.hds
asserts with
    bdrv_truncate: Assertion `child->perm & BLK_PERM_RESIZE' failed.

Parameters used on the write path are not needed if the image is opened
in the read-only mode.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Reported-by: Edgar Kaziahmedov <edos@virtuozzo.mipt.ru>
Message-id: 1490625488-7980-1-git-send-email-den@openvz.org
CC: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Denis V. Lunev 2017-03-27 17:38:08 +03:00 committed by Stefan Hajnoczi
parent eb06c9e2d3
commit dc62da88b5
1 changed files with 2 additions and 1 deletions
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3
block/parallels.c
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@ -687,7 +687,8 @@ static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
if (local_err != NULL) {
goto fail_options;
}
if (!bdrv_has_zero_init(bs->file->bs) ||
if (!(flags & BDRV_O_RESIZE) || !bdrv_has_zero_init(bs->file->bs) ||
bdrv_truncate(bs->file, bdrv_getlength(bs->file->bs)) != 0) {
s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE;
}