[PATCH v3 01/12] qcow2: make function update_refcount_discard() global

[Andrey Drobyshev <andrey.drobyshev@virtuozzo.com>]

We are going to need it for discarding separate subclusters.  The
function itself doesn't do anything with the refcount tables, it simply
adds a discard request to the queue, so rename it to qcow2_queue_discard().

Signed-off-by: Andrey Drobyshev <andrey.drobyshev@virtuozzo.com>
Reviewed-by: Alexander Ivanov <alexander.ivanov@virtuozzo.com>
Reviewed-by: Hanna Czenczek <hreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
---
 block/qcow2-refcount.c | 8 ++++----
 block/qcow2.h          | 2 ++
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index 0266542cee..2026f5fa21 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -754,8 +754,8 @@ void qcow2_process_discards(BlockDriverState *bs, int ret)
     }
 }
 
-static void update_refcount_discard(BlockDriverState *bs,
-                                    uint64_t offset, uint64_t length)
+void qcow2_queue_discard(BlockDriverState *bs, uint64_t offset,
+                         uint64_t length)
 {
     BDRVQcow2State *s = bs->opaque;
     Qcow2DiscardRegion *d, *p, *next;
@@ -902,7 +902,7 @@ update_refcount(BlockDriverState *bs, int64_t offset, int64_t length,
             }
 
             if (s->discard_passthrough[type]) {
-                update_refcount_discard(bs, cluster_offset, s->cluster_size);
+                qcow2_queue_discard(bs, cluster_offset, s->cluster_size);
             }
         }
     }
@@ -3619,7 +3619,7 @@ qcow2_discard_refcount_block(BlockDriverState *bs, uint64_t discard_block_offs)
         /* discard refblock from the cache if refblock is cached */
         qcow2_cache_discard(s->refcount_block_cache, refblock);
     }
-    update_refcount_discard(bs, discard_block_offs, s->cluster_size);
+    qcow2_queue_discard(bs, discard_block_offs, s->cluster_size);
 
     return 0;
 }
diff --git a/block/qcow2.h b/block/qcow2.h
index a9e3481c6e..197bdcdf53 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -891,6 +891,8 @@ int coroutine_fn qcow2_check_refcounts(BlockDriverState *bs, BdrvCheckResult *re
                                        BdrvCheckMode fix);
 
 void GRAPH_RDLOCK qcow2_process_discards(BlockDriverState *bs, int ret);
+void qcow2_queue_discard(BlockDriverState *bs, uint64_t offset,
+                         uint64_t length);
 
 int GRAPH_RDLOCK
 qcow2_check_metadata_overlap(BlockDriverState *bs, int ign, int64_t offset,
-- 
2.39.3