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From 3a454be93c4750bad515dc3dacc83a3feff5e02c Mon Sep 17 00:00:00 2001
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From: Max Reitz <mreitz@redhat.com>
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Date: Tue, 7 Jan 2014 21:57:10 +0100
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Subject: [PATCH 05/14] qcow2-cache: Empty cache
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RH-Author: Max Reitz <mreitz@redhat.com>
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Message-id: <1389131839-12920-6-git-send-email-mreitz@redhat.com>
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Patchwork-id: 56541
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O-Subject: [RHEL-7.0 qemu-kvm PATCH v2 05/14] qcow2-cache: Empty cache
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Bugzilla: 1033490
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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BZ: 1033490
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Add a function for emptying a cache, i.e., flushing it and marking all
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elements invalid.
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit e7108feaace8e02b3a4bf010448fc2744f753381)
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Signed-off-by: Max Reitz <mreitz@redhat.com>
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---
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block/qcow2-cache.c | 18 ++++++++++++++++++
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block/qcow2.h | 2 ++
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2 files changed, 20 insertions(+)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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block/qcow2-cache.c | 18 ++++++++++++++++++
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block/qcow2.h | 2 ++
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2 files changed, 20 insertions(+), 0 deletions(-)
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diff --git a/block/qcow2-cache.c b/block/qcow2-cache.c
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index eb1d69b..8ecbb5b 100644
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--- a/block/qcow2-cache.c
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+++ b/block/qcow2-cache.c
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@@ -200,6 +200,24 @@ void qcow2_cache_depends_on_flush(Qcow2Cache *c)
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c->depends_on_flush = true;
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}
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+int qcow2_cache_empty(BlockDriverState *bs, Qcow2Cache *c)
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+{
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+ int ret, i;
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+
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+ ret = qcow2_cache_flush(bs, c);
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+ if (ret < 0) {
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+ return ret;
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+ }
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+
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+ for (i = 0; i < c->size; i++) {
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+ assert(c->entries[i].ref == 0);
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+ c->entries[i].offset = 0;
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+ c->entries[i].cache_hits = 0;
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+ }
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+
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+ return 0;
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+}
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+
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static int qcow2_cache_find_entry_to_replace(Qcow2Cache *c)
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{
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int i;
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diff --git a/block/qcow2.h b/block/qcow2.h
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index e4c140c..5ca6b78 100644
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--- a/block/qcow2.h
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+++ b/block/qcow2.h
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@@ -489,6 +489,8 @@ int qcow2_cache_set_dependency(BlockDriverState *bs, Qcow2Cache *c,
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Qcow2Cache *dependency);
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void qcow2_cache_depends_on_flush(Qcow2Cache *c);
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+int qcow2_cache_empty(BlockDriverState *bs, Qcow2Cache *c);
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+
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int qcow2_cache_get(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,
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void **table);
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int qcow2_cache_get_empty(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,
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--
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1.7.1
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