On Thu, Jul 29, 2010 at 09:04:01AM +1000, Neil Brown wrote: > On Wed, 28 Jul 2010 18:28:02 +0100 > David Howells <dhowells@xxxxxxxxxx> wrote: > > > Neil Brown <neilb@xxxxxxx> wrote: > > > > > ctime and mtime have real cache-coherence semantics which require them being > > > updated by the kernel (whether the cache is on an NFS client, in a backup > > > archive, or in a .o translation of a .c file). > > > > So does creation time, at least for CIFS caching. Creation time has potential > > for spotting when the object at a pathname has changed for something else, > > given the lack of inode number and inode generation from windows servers. > > Creation time gives us one more datum to use. > > This justifies for me why a CIFS client would want to extract the > creation-time from the CIFS protocol, but not why you want to expose it via a > generic interface. > The kernel/filesystem doesn't need to maintain creation-time to meet this > need, only the CIFS server needs to maintain it For what it's worth, the NFSv4 server would also export creation time if we had it. --b. -- 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
