On 26.10.19 23:25, Alberto Garcia wrote: > Setting the QCOW_OFLAG_ZERO bit of the L2 entry is forbidden if an > image has subclusters. Instead, the individual 'all zeroes' bits must > be used. > > Signed-off-by: Alberto Garcia <be...@igalia.com> > --- > block/qcow2-cluster.c | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) > > diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c > index 3e4ba8d448..aa3eb727a5 100644 > --- a/block/qcow2-cluster.c > +++ b/block/qcow2-cluster.c > @@ -1772,7 +1772,11 @@ static int discard_in_l2_slice(BlockDriverState *bs, > uint64_t offset, > > /* First remove L2 entries */ > qcow2_cache_entry_mark_dirty(s->l2_table_cache, l2_slice); > - if (!full_discard && s->qcow_version >= 3) { > + if (has_subclusters(s)) { > + set_l2_entry(s, l2_slice, l2_index + i, 0); > + set_l2_bitmap(s, l2_slice, l2_index + i, > + full_discard ? 0 : QCOW_L2_BITMAP_ALL_ZEROES);
But only for !full_discard, right? Max > + } else if (!full_discard && s->qcow_version >= 3) { > set_l2_entry(s, l2_slice, l2_index + i, QCOW_OFLAG_ZERO); > } else { > set_l2_entry(s, l2_slice, l2_index + i, 0); >
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