linux-kernel - Re: [patch 4/8] fs, exportfs: Add export_encode_inode

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Message-ID: <20120816150932.GD13066@moon>
Date:	Thu, 16 Aug 2012 19:09:32 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	"J. Bruce Fields" <bfields@...ldses.org>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Alexey Dobriyan <adobriyan@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	James Bottomley <jbottomley@...allels.com>,
	Matthew Helsley <matt.helsley@...il.com>
Subject: Re: [patch 4/8] fs, exportfs: Add export_encode_inode_fh helper

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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