diff mbox

[v5,2/6] qcow2-cache: Empty cache

Message ID 1378195795-1674-3-git-send-email-mreitz@redhat.com
State New
Headers show

Commit Message

Max Reitz Sept. 3, 2013, 8:09 a.m. UTC 
Add a function for emptying a cache, i.e., flushing it and marking all
elements invalid.

Signed-off-by: Max Reitz <mreitz@redhat.com>
---
 block/qcow2-cache.c | 18 ++++++++++++++++++
 block/qcow2.h       |  2 ++
 2 files changed, 20 insertions(+)
diff mbox

Patch

diff --git a/block/qcow2-cache.c b/block/qcow2-cache.c
index 7bcae09..40a5a3f 100644
--- a/block/qcow2-cache.c
+++ b/block/qcow2-cache.c
@@ -202,6 +202,24 @@  void qcow2_cache_depends_on_flush(Qcow2Cache *c)
     c->depends_on_flush = true;
 }
 
+int qcow2_cache_empty(BlockDriverState *bs, Qcow2Cache *c)
+{
+    int ret, i;
+
+    ret = qcow2_cache_flush(bs, c);
+    if (ret < 0) {
+        return ret;
+    }
+
+    for (i = 0; i < c->size; i++) {
+        assert(c->entries[i].ref == 0);
+        c->entries[i].offset = 0;
+        c->entries[i].cache_hits = 0;
+    }
+
+    return 0;
+}
+
 static int qcow2_cache_find_entry_to_replace(Qcow2Cache *c)
 {
     int i;
diff --git a/block/qcow2.h b/block/qcow2.h
index 10b7bf4..3db0877 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -473,6 +473,8 @@  int qcow2_cache_set_dependency(BlockDriverState *bs, Qcow2Cache *c,
     Qcow2Cache *dependency);
 void qcow2_cache_depends_on_flush(Qcow2Cache *c);
 
+int qcow2_cache_empty(BlockDriverState *bs, Qcow2Cache *c);
+
 int qcow2_cache_get(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,
     void **table);
 int qcow2_cache_get_empty(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,