From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:40416) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VKRuE-0006Mz-MS for qemu-devel@nongnu.org; Fri, 13 Sep 2013 07:51:28 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1VKRu7-0001O7-Bp for qemu-devel@nongnu.org; Fri, 13 Sep 2013 07:51:22 -0400 Received: from mx1.redhat.com ([209.132.183.28]:16949) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VKRu7-0001O0-4A for qemu-devel@nongnu.org; Fri, 13 Sep 2013 07:51:15 -0400 From: Kevin Wolf Date: Fri, 13 Sep 2013 13:50:35 +0200 Message-Id: <1379073063-14963-6-git-send-email-kwolf@redhat.com> In-Reply-To: <1379073063-14963-1-git-send-email-kwolf@redhat.com> References: <1379073063-14963-1-git-send-email-kwolf@redhat.com> Subject: [Qemu-devel] [PULL 05/33] qcow2-cache: Empty cache List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: anthony@codemonkey.ws Cc: kwolf@redhat.com, qemu-devel@nongnu.org From: Max Reitz Add a function for emptying a cache, i.e., flushing it and marking all elements invalid. Signed-off-by: Max Reitz Signed-off-by: Kevin Wolf --- 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 49eed82..35c822b 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -478,6 +478,8 @@ 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, -- 1.8.1.4