From 9f7965c7e965c8b80da27048017a360b3c57c4af Mon Sep 17 00:00:00 2001 From: aliguori Date: Tue, 14 Oct 2008 14:42:54 +0000 Subject: Expand cache= option and use write-through caching by default This patch changes the cache= option to accept none, writeback, or writethough to control the host page cache behavior. By default, writethrough caching is now used which internally is implemented by using O_DSYNC to open the disk images. When using -snapshot, writeback is used by default since data integrity it not at all an issue. cache=none has the same behavior as cache=off previously. The later syntax is still supported by now deprecated. I also cleaned up the O_DIRECT implementation to avoid many of the #ifdefs. Signed-off-by: Anthony Liguori git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5485 c046a42c-6fe2-441c-8c8c-71466251a162 --- qemu-nbd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'qemu-nbd.c') diff --git a/qemu-nbd.c b/qemu-nbd.c index d5d5db7..fa61816 100644 --- a/qemu-nbd.c +++ b/qemu-nbd.c @@ -232,7 +232,7 @@ int main(int argc, char **argv) flags |= BDRV_O_SNAPSHOT; break; case 'n': - flags |= BDRV_O_DIRECT; + flags |= BDRV_O_NOCACHE; break; case 'b': bindto = optarg; -- cgit v1.1