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

[Cyrill Gorcunov]

On Thu, Aug 16, 2012 at 04:05:42PM +0100, Al Viro wrote:
> On Thu, Aug 16, 2012 at 06:57:00PM +0400, Cyrill Gorcunov wrote:
> 
> > Guys, would the patch below be more-less acceptible?
> > In inotify I think we could pass "parent" as NULL and use general
> > encode engine then (ie it will look like someone called for
> > name_to_handle_at on inotify target).
> 
> Wait.  What the hell are you going to do with those afterwards?
> Again, there's a shitload of filesystems that cannot be exported
> over NFS, exactly because there's no way to implement sanely
> working fhandles.  And idiotify is allowed for all of them.

Yes, just recognized that, Al. There will be no way to restore them
from fhandle provided via fdinfo. /me scratching the head...

> You *can't* decode anything fhandle-like on e.g. sysfs.  Or procfs.
> Or configfs.  Or any network filesystem (I'd argue that we should simply
> ban idiotify on those, but good luck doing that).  You *can* do that
> for FAT derivatives, but only if you have parent directory when creating
> that sucker.

	Cyrill
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