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

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Date:	Thu, 16 Aug 2012 16:05:42 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>
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 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.

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.
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