[PATCH 041/270] pnfsblock: fix partial page buffer wirte

[Greg Kroah-Hartman]

On Tue, Nov 27, 2012 at 02:33:24AM +0000, Ben Hutchings wrote:
> On Mon, 2012-11-26 at 14:55 -0200, Herton Ronaldo Krzesinski wrote:
> > 3.5.7u1 -stable review patch.  If anyone has any objections, please let me know.
> > 
> > ------------------
> > 
> > From: Peng Tao <bergwolf at gmail.com>
> > 
> > commit fe6e1e8d9fad86873eb74a26e80a8f91f9e870b5 upstream.
> > 
> > If applications use flock to protect its write range, generic NFS
> > will not do read-modify-write cycle at page cache level. Therefore
> > LD should know how to handle non-sector aligned writes. Otherwise
> > there will be data corruption.
> > 
> > Signed-off-by: Peng Tao <tao.peng at emc.com>
> > Signed-off-by: Trond Myklebust <Trond.Myklebust at netapp.com>
> > Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski at canonical.com>
> [...]
> 
> I notice that this fix is missing from 3.4, and will need backporting.

I don't trust myself with backporting this, as I got it wrong.  So if
one of the NFS developers wants to do this (same goes for the other NFS
patch), I'll gladly take it.

thanks,

greg k-h