On Sun, 13 Mar 2011 17:23:50 +0000, Stefan Hajnoczi <stefa...@gmail.com> wrote: > On Sat, Mar 5, 2011 at 5:52 PM, Aneesh Kumar K.V > <aneesh.ku...@linux.vnet.ibm.com> wrote: > > cache=none implies the file are opened in the host with O_SYNC open flag > > O_SYNC does not bypass the host page cache. It ensures that writes > only complete once data has been written to the disk. > > O_DIRECT is a hint to bypass the host page cache when possible. > > A boolean on|off option would be nicer than an option that takes the > special string "none". For example, direct=on|off. It also makes the > code nicer by using bools instead of strdup strings that get leaked. >
What i wanted is the O_SYNC behavior. Well the comment should be updated. I want to make sure that we don't have dirty data in host page cache after a write. It is always good to make read hit the page cache -aneesh
