[19/31] qcow2: Update qcow2_alloc_cluster_link_l2() to support L2 slices

Message ID 80992b09202b081f0c7ace58c51d18974e96e79d.1507813391.git.berto@igalia.com
State New
Headers show
Series
  • Allow configuring the qcow2 L2 cache entry size
Related show

Commit Message

Alberto Garcia Oct. 12, 2017, 1:05 p.m.
There's a loop in this function that iterates over the L2 entries in a
table, so now we need to assert that it remains within the limits of
an L2 slice.

Apart from that, this function doesn't need any additional changes, so
this patch simply updates the variable name from l2_table to l2_slice.

Signed-off-by: Alberto Garcia <berto@igalia.com>
---
 block/qcow2-cluster.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

Patch

diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index 860e56ec7c..1dccdbdd94 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -922,7 +922,7 @@  int qcow2_alloc_cluster_link_l2(BlockDriverState *bs, QCowL2Meta *m)
 {
     BDRVQcow2State *s = bs->opaque;
     int i, j = 0, l2_index, ret;
-    uint64_t *old_cluster, *l2_table;
+    uint64_t *old_cluster, *l2_slice;
     uint64_t cluster_offset = m->alloc_offset;
 
     trace_qcow2_cluster_link_l2(qemu_coroutine_self(), m->nb_clusters);
@@ -949,13 +949,13 @@  int qcow2_alloc_cluster_link_l2(BlockDriverState *bs, QCowL2Meta *m)
                                    s->refcount_block_cache);
     }
 
-    ret = get_cluster_table(bs, m->offset, &l2_table, &l2_index);
+    ret = get_cluster_table(bs, m->offset, &l2_slice, &l2_index);
     if (ret < 0) {
         goto err;
     }
-    qcow2_cache_entry_mark_dirty(s->l2_table_cache, l2_table);
+    qcow2_cache_entry_mark_dirty(s->l2_table_cache, l2_slice);
 
-    assert(l2_index + m->nb_clusters <= s->l2_size);
+    assert(l2_index + m->nb_clusters <= s->l2_slice_size);
     for (i = 0; i < m->nb_clusters; i++) {
         /* if two concurrent writes happen to the same unallocated cluster
          * each write allocates separate cluster and writes data concurrently.
@@ -963,16 +963,16 @@  int qcow2_alloc_cluster_link_l2(BlockDriverState *bs, QCowL2Meta *m)
          * cluster the second one has to do RMW (which is done above by
          * perform_cow()), update l2 table with its cluster pointer and free
          * old cluster. This is what this loop does */
-        if (l2_table[l2_index + i] != 0) {
-            old_cluster[j++] = l2_table[l2_index + i];
+        if (l2_slice[l2_index + i] != 0) {
+            old_cluster[j++] = l2_slice[l2_index + i];
         }
 
-        l2_table[l2_index + i] = cpu_to_be64((cluster_offset +
+        l2_slice[l2_index + i] = cpu_to_be64((cluster_offset +
                     (i << s->cluster_bits)) | QCOW_OFLAG_COPIED);
      }
 
 
-    qcow2_cache_put(s->l2_table_cache, (void **) &l2_table);
+    qcow2_cache_put(s->l2_table_cache, (void **) &l2_slice);
 
     /*
      * If this was a COW, we need to decrease the refcount of the old cluster.