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| author | aliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162> | 2008-10-14 14:42:54 +0000 |
|---|---|---|
| committer | aliguori <aliguori@c046a42c-6fe2-441c-8c8c-71466251a162> | 2008-10-14 14:42:54 +0000 |
| commit | 9f7965c7e965c8b80da27048017a360b3c57c4af (patch) | |
| tree | 9a7b218b7a7b590fe926f1c282dfa0916f19092c /qemu-nbd.c | |
| parent | eeb438c1b84468e8faa7e69bec86b78b45f2347f (diff) | |
| download | qemu-9f7965c7e965c8b80da27048017a360b3c57c4af.tar.gz | |
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.c | 2 |
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; |