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authoraliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162>2008-10-14 14:42:54 +0000
committeraliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162>2008-10-14 14:42:54 +0000
commit9f7965c7e965c8b80da27048017a360b3c57c4af (patch)
tree9a7b218b7a7b590fe926f1c282dfa0916f19092c /qemu-nbd.c
parenteeb438c1b84468e8faa7e69bec86b78b45f2347f (diff)
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 <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5485 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'qemu-nbd.c')
-rw-r--r--qemu-nbd.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/qemu-nbd.c b/qemu-nbd.c
index d5d5db73a0..fa618165c8 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;