Extended file stat: Splitting file- and fs-specific info?

Bernd Schubert bernd.schubert at itwm.fraunhofer.de
Wed May 9 06:25:20 MDT 2012

On 05/09/2012 02:05 PM, Christoph Hellwig wrote:
> On Wed, May 09, 2012 at 01:55:16PM +0200, Bernd Schubert wrote:
>> The basic idea of generation numbers is to check if an inode was
>> recycled, so only if the tuple of inode-number and generation-number
>> matches we still have the same file. Kernel nfs
> NFS does not and should not look at the inode generation.  Except for a
> bit of legacy code for the old pre-Linux 2.4 filehandles it looks at the
> opaque file handle returned and only interpreted by the filesystem.  Any
> userspace NFS server should do the same.

Ok, I didn't look how kernel NFS does it for quite some time already...
User space NFS only can do it beginning with 2.6.39 - given that user 
space also needs to support older kernels and other OSs, which might not 
have open_by_handle, userspace unfortunately cannot entirely rely on 
that feature.


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