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[Qemu-devel] [PATCH v5 2/6] qcow2-cache: Empty cache
From: |
Max Reitz |
Subject: |
[Qemu-devel] [PATCH v5 2/6] qcow2-cache: Empty cache |
Date: |
Tue, 3 Sep 2013 10:09:51 +0200 |
Add a function for emptying a cache, i.e., flushing it and marking all
elements invalid.
Signed-off-by: Max Reitz <address@hidden>
---
block/qcow2-cache.c | 18 ++++++++++++++++++
block/qcow2.h | 2 ++
2 files changed, 20 insertions(+)
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,
--
1.8.3.1
- [Qemu-devel] [PATCH v5 0/6] block/qcow2: Image file option amendment, Max Reitz, 2013/09/03
- [Qemu-devel] [PATCH v5 1/6] block: Image file option amendment, Max Reitz, 2013/09/03
- [Qemu-devel] [PATCH v5 2/6] qcow2-cache: Empty cache,
Max Reitz <=
- [Qemu-devel] [PATCH v5 3/6] qcow2-cluster: Expand zero clusters, Max Reitz, 2013/09/03
- [Qemu-devel] [PATCH v5 6/6] qemu-iotest: qcow2 image option amendment, Max Reitz, 2013/09/03
- [Qemu-devel] [PATCH v5 5/6] qcow2: Implement bdrv_amend_options, Max Reitz, 2013/09/03
- [Qemu-devel] [PATCH v5 4/6] qcow2: Save refcount order in BDRVQcowState, Max Reitz, 2013/09/03
- Re: [Qemu-devel] [PATCH v5 0/6] block/qcow2: Image file option amendment, Kevin Wolf, 2013/09/03
- Re: [Qemu-devel] [PATCH v5 0/6] block/qcow2: Image file option amendment, Kevin Wolf, 2013/09/09