diff options
| -rw-r--r-- | block/qed.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/block/qed.c b/block/qed.c index a02dbfd72d..21cb239870 100644 --- a/block/qed.c +++ b/block/qed.c @@ -1363,10 +1363,21 @@ static int coroutine_fn bdrv_qed_co_write_zeroes(BlockDriverState *bs, int nb_sectors) { BlockDriverAIOCB *blockacb; + BDRVQEDState *s = bs->opaque; QEDWriteZeroesCB cb = { .done = false }; QEMUIOVector qiov; struct iovec iov; + /* Refuse if there are untouched backing file sectors */ + if (bs->backing_hd) { + if (qed_offset_into_cluster(s, sector_num * BDRV_SECTOR_SIZE) != 0) { + return -ENOTSUP; + } + if (qed_offset_into_cluster(s, nb_sectors * BDRV_SECTOR_SIZE) != 0) { + return -ENOTSUP; + } + } + /* Zero writes start without an I/O buffer. If a buffer becomes necessary * then it will be allocated during request processing. */ |