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qcow2: Fix v3 snapshot table entry compliancy

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qcow2 v3 images require every snapshot table entry to have at least 16
bytes of extra data.  If they do not, let qemu-img check -r all fix it.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 20191011152814.14791-15-mreitz@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Max Reitz 2019-10-11 17:28:12 +02:00
parent d2b1d1ec73
commit e40e6e88f6
1 changed files with 18 additions and 0 deletions
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18
block/qcow2-snapshot.c
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@ -516,6 +516,24 @@ int coroutine_fn qcow2_check_read_snapshot_table(BlockDriverState *bs,
result->corruptions -= nb_clusters_reduced;
}
/*
* All of v3 images' snapshot table entries need to have at least
* 16 bytes of extra data.
*/
if (s->qcow_version >= 3) {
int i;
for (i = 0; i < s->nb_snapshots; i++) {
if (s->snapshots[i].extra_data_size <
sizeof_field(QCowSnapshotExtraData, vm_state_size_large) +
sizeof_field(QCowSnapshotExtraData, disk_size))
{
result->corruptions++;
fprintf(stderr, "%s snapshot table entry %i is incomplete\n",
fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i);
}
}
}
return 0;
}