From: Eric Blake <[email protected]> Our .bdrv_has_zero_init_truncate always returns 1 because sheepdog always 0-fills; we can use that same knowledge to implement BDRV_REQ_ZERO_WRITE by ignoring it.
Signed-off-by: Eric Blake <[email protected]> Message-Id: <[email protected]> Signed-off-by: Kevin Wolf <[email protected]> --- block/sheepdog.c | 1 + 1 file changed, 1 insertion(+) diff --git a/block/sheepdog.c b/block/sheepdog.c index 2eb61938ff..739e6dee30 100644 --- a/block/sheepdog.c +++ b/block/sheepdog.c @@ -1654,6 +1654,7 @@ static int sd_open(BlockDriverState *bs, QDict *options, int flags, memcpy(&s->inode, buf, sizeof(s->inode)); bs->total_sectors = s->inode.vdi_size / BDRV_SECTOR_SIZE; + bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE; pstrcpy(s->name, sizeof(s->name), vdi); qemu_co_mutex_init(&s->lock); qemu_co_mutex_init(&s->queue_lock); -- 2.25.3
