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qcow2-refcount: fix_l2_entry_by_zero(): also zero L2 entry bitmap 

We'll reuse the function to fix wrong L2 entry bitmap. Support it now.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Hanna Reitz <hreitz@redhat.com>
Message-Id: <20210914122454.141075-6-vsementsov@virtuozzo.com>
Signed-off-by: Hanna Reitz <hreitz@redhat.com>
master
Vladimir Sementsov-Ogievskiy 2021-09-14 15:24:49 +03:00 committed by Hanna Reitz
parent a2debf6506
commit 5c3216c046
1 changed files with 15 additions and 3 deletions
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18
block/qcow2-refcount.c
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@ -1588,7 +1588,8 @@ enum {
};
/*
* Fix L2 entry by making it QCOW2_CLUSTER_ZERO_PLAIN.
* Fix L2 entry by making it QCOW2_CLUSTER_ZERO_PLAIN (or making all its present
* subclusters QCOW2_SUBCLUSTER_ZERO_PLAIN).
*
* This function decrements res->corruptions on success, so the caller is
* responsible to increment res->corruptions prior to the call.
@ -1605,9 +1606,20 @@ static int fix_l2_entry_by_zero(BlockDriverState *bs, BdrvCheckResult *res,
int idx = l2_index * (l2_entry_size(s) / sizeof(uint64_t));
uint64_t l2e_offset = l2_offset + (uint64_t)l2_index * l2_entry_size(s);
int ign = active ? QCOW2_OL_ACTIVE_L2 : QCOW2_OL_INACTIVE_L2;
uint64_t l2_entry = has_subclusters(s) ? 0 : QCOW_OFLAG_ZERO;
set_l2_entry(s, l2_table, l2_index, l2_entry);
if (has_subclusters(s)) {
uint64_t l2_bitmap = get_l2_bitmap(s, l2_table, l2_index);
/* Allocated subclusters become zero */
l2_bitmap |= l2_bitmap << 32;
l2_bitmap &= QCOW_L2_BITMAP_ALL_ZEROES;
set_l2_bitmap(s, l2_table, l2_index, l2_bitmap);
set_l2_entry(s, l2_table, l2_index, 0);
} else {
set_l2_entry(s, l2_table, l2_index, QCOW_OFLAG_ZERO);
}
ret = qcow2_pre_write_overlap_check(bs, ign, l2e_offset, l2_entry_size(s),
false);
if (metadata_overlap) {