Re: [patch 4/8] fs, exportfs: Add export_encode_inode_fh helper

[Cyrill Gorcunov]

On Thu, Aug 16, 2012 at 03:55:27PM +0100, Al Viro wrote:
> On Thu, Aug 16, 2012 at 06:48:35PM +0400, Cyrill Gorcunov wrote:
> 
> > > Good luck doing that with e.g. VFAT...  And then there's such thing
> > > as filesystems that don't have ->encode_fh() for a lot of very good
> > 
> > Wait, Al, it seems I messed up. If some fs has no encode_fh() implemented
> > the default encoding with FILEID_INO32_GEN_PARENT will be used for that.
> 
> ... which doesn't work for a lot of filesystems.  Not if you want to be
> able to decode the result afterwards and get something useful out of
> that.  Trying to implement ->fh_to_dentry(), especially with fhandle
> generated by inode alone is going to be really interesting for a bunch
> of stuff...

hmm, yup (and Bruce just pointed me to exportfs_decode_fh). So, if fs doesn't
provide encode_fh (and decode as well) but the FILEID_INO32_GEN_PARENT used
instead, we will not be able to restore such inotify later. Then I suppose
such application will be unrestorable at least for a while. Would not this
be acceptable trade off?

	Cyrill
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