On Fri, Nov 19, 2010 at 04:26:35PM -0500, Trond Myklebust wrote: > If the application requests O_DIRECT/O_SYNC or calls fsync(), we are > required by POSIX to ensure the data is safe on disk. The presence of an > NFS delegation does not change that requirement. That's not quite correct. O_DIRECT for one is not actually specific in Posix at all, and the documented Linux semantics only say that the pagecache should not be used (even if it sometimes is with various filesystems). There is not guarantee that data actually is on disk or reachable, for that you need to add the O_SYNC/O_DYSNC flag in addition or use fsync/fdatasync. -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
