diff mbox series

[2/2] qcow2: Make qcow2_free_any_clusters() free only one cluster

Message ID 77cea0f4616f921d37e971b3c5b18a2faa24b173.1599573989.git.berto@igalia.com (mailing list archive)
State New, archived
Headers show
Series Fix error handling in preallocate_co() | expand

Commit Message

Alberto Garcia Sept. 8, 2020, 2:08 p.m. UTC
This function takes an L2 entry and a number of clusters to free.
Although in principle it can free any type of cluster (using the L2
entry to determine its type) in practice the API is broken because
compressed clusters have a variable size and there is no way to free
more than one without having the L2 entry of each one of them.

The good news all callers are passing nb_clusters=1 so we can simply
get rid of that parameter.

Signed-off-by: Alberto Garcia <berto@igalia.com>
---
 block/qcow2.h          | 4 ++--
 block/qcow2-cluster.c  | 6 +++---
 block/qcow2-refcount.c | 8 ++++----
 3 files changed, 9 insertions(+), 9 deletions(-)
diff mbox series

Patch

diff --git a/block/qcow2.h b/block/qcow2.h
index 065ec3df0b..bb6358121d 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -855,8 +855,8 @@  int64_t qcow2_alloc_bytes(BlockDriverState *bs, int size);
 void qcow2_free_clusters(BlockDriverState *bs,
                           int64_t offset, int64_t size,
                           enum qcow2_discard_type type);
-void qcow2_free_any_clusters(BlockDriverState *bs, uint64_t l2_entry,
-                             int nb_clusters, enum qcow2_discard_type type);
+void qcow2_free_any_cluster(BlockDriverState *bs, uint64_t l2_entry,
+                            enum qcow2_discard_type type);
 
 int qcow2_update_snapshot_refcount(BlockDriverState *bs,
     int64_t l1_table_offset, int l1_size, int addend);
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index 996b3314f4..89c561e4c0 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -1096,7 +1096,7 @@  int qcow2_alloc_cluster_link_l2(BlockDriverState *bs, QCowL2Meta *m)
      */
     if (!m->keep_old_clusters && j != 0) {
         for (i = 0; i < j; i++) {
-            qcow2_free_any_clusters(bs, old_cluster[i], 1, QCOW2_DISCARD_NEVER);
+            qcow2_free_any_cluster(bs, old_cluster[i], QCOW2_DISCARD_NEVER);
         }
     }
 
@@ -1911,7 +1911,7 @@  static int discard_in_l2_slice(BlockDriverState *bs, uint64_t offset,
             set_l2_bitmap(s, l2_slice, l2_index + i, new_l2_bitmap);
         }
         /* Then decrease the refcount */
-        qcow2_free_any_clusters(bs, old_l2_entry, 1, type);
+        qcow2_free_any_cluster(bs, old_l2_entry, type);
     }
 
     qcow2_cache_put(s->l2_table_cache, (void **) &l2_slice);
@@ -2003,7 +2003,7 @@  static int zero_in_l2_slice(BlockDriverState *bs, uint64_t offset,
 
         qcow2_cache_entry_mark_dirty(s->l2_table_cache, l2_slice);
         if (unmap) {
-            qcow2_free_any_clusters(bs, old_l2_entry, 1, QCOW2_DISCARD_REQUEST);
+            qcow2_free_any_cluster(bs, old_l2_entry, QCOW2_DISCARD_REQUEST);
         }
         set_l2_entry(s, l2_slice, l2_index + i, new_l2_entry);
         if (has_subclusters(s)) {
diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index aae52607eb..fc9bb2258f 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -1156,8 +1156,8 @@  void qcow2_free_clusters(BlockDriverState *bs,
  * Free a cluster using its L2 entry (handles clusters of all types, e.g.
  * normal cluster, compressed cluster, etc.)
  */
-void qcow2_free_any_clusters(BlockDriverState *bs, uint64_t l2_entry,
-                             int nb_clusters, enum qcow2_discard_type type)
+void qcow2_free_any_cluster(BlockDriverState *bs, uint64_t l2_entry,
+                            enum qcow2_discard_type type)
 {
     BDRVQcow2State *s = bs->opaque;
     QCow2ClusterType ctype = qcow2_get_cluster_type(bs, l2_entry);
@@ -1168,7 +1168,7 @@  void qcow2_free_any_clusters(BlockDriverState *bs, uint64_t l2_entry,
              ctype == QCOW2_CLUSTER_ZERO_ALLOC))
         {
             bdrv_pdiscard(s->data_file, l2_entry & L2E_OFFSET_MASK,
-                          nb_clusters << s->cluster_bits);
+                          s->cluster_size);
         }
         return;
     }
@@ -1191,7 +1191,7 @@  void qcow2_free_any_clusters(BlockDriverState *bs, uint64_t l2_entry,
                                     l2_entry & L2E_OFFSET_MASK);
         } else {
             qcow2_free_clusters(bs, l2_entry & L2E_OFFSET_MASK,
-                                nb_clusters << s->cluster_bits, type);
+                                s->cluster_size, type);
         }
         break;
     case QCOW2_CLUSTER_ZERO_PLAIN: