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qcow2: Clean up after refcount rebuild 

Because the old refcount structure will be leaked after having rebuilt
it, we need to recalculate the refcounts and run a leak-fixing operation
afterwards (if leaks should be fixed at all).

Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2014-10-22 14:09:41 +02:00 committed by Kevin Wolf
parent c7c0681bc8
commit 791230d8bb
1 changed files with 45 additions and 0 deletions
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45
block/qcow2-refcount.c
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@ -2011,12 +2011,57 @@ int qcow2_check_refcounts(BlockDriverState *bs, BdrvCheckResult *res,
nb_clusters);
if (rebuild && (fix & BDRV_FIX_ERRORS)) {
BdrvCheckResult old_res = *res;
int fresh_leaks = 0;
fprintf(stderr, "Rebuilding refcount structure\n");
ret = rebuild_refcount_structure(bs, res, &refcount_table,
&nb_clusters);
if (ret < 0) {
goto fail;
}
res->corruptions = 0;
res->leaks = 0;
/* Because the old reftable has been exchanged for a new one the
* references have to be recalculated */
rebuild = false;
memset(refcount_table, 0, nb_clusters * sizeof(uint16_t));
ret = calculate_refcounts(bs, res, 0, &rebuild, &refcount_table,
&nb_clusters);
if (ret < 0) {
goto fail;
}
if (fix & BDRV_FIX_LEAKS) {
/* The old refcount structures are now leaked, fix it; the result
* can be ignored, aside from leaks which were introduced by
* rebuild_refcount_structure() that could not be fixed */
BdrvCheckResult saved_res = *res;
*res = (BdrvCheckResult){ 0 };
compare_refcounts(bs, res, BDRV_FIX_LEAKS, &rebuild,
&highest_cluster, refcount_table, nb_clusters);
if (rebuild) {
fprintf(stderr, "ERROR rebuilt refcount structure is still "
"broken\n");
}
/* Any leaks accounted for here were introduced by
* rebuild_refcount_structure() because that function has created a
* new refcount structure from scratch */
fresh_leaks = res->leaks;
*res = saved_res;
}
if (res->corruptions < old_res.corruptions) {
res->corruptions_fixed += old_res.corruptions - res->corruptions;
}
if (res->leaks < old_res.leaks) {
res->leaks_fixed += old_res.leaks - res->leaks;
}
res->leaks += fresh_leaks;
} else if (fix) {
if (rebuild) {
fprintf(stderr, "ERROR need to rebuild refcount structures\n");