linux-kernel - name_to_handle_at() and persistent filesystem IDs

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Date:	Sun, 16 Mar 2014 08:43:58 +0100
From:	Michael Kerrisk <mtk.manpages@...il.com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	Linux-Fsdevel <linux-fsdevel@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Andreas Dilger <adilger@...ger.ca>, NeilBrown <neilb@...e.de>,
	Miklos Szeredi <miklos@...redi.hu>,
	Bruce Fields <bfields@...ldses.org>, linux-man@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>
Subject: name_to_handle_at() and persistent filesystem IDs

Hello Aneesh,

I'm currently working on a man page for name_to_handle_at() and
open_by_handle_at(), and I have a question relating to a point that
probably needs to be covered in the man page.

Back in July 2010, in this thread:
http://thread.gmane.org/gmane.linux.file-systems/41782/focus=43131
you said:

[[
mount id should not be looked at as a persistent identifier. It should
be used to derive a persistent identifier from /proc/self/mountinfo. The
persistent identifier could be the combination of device properties,
file system properties or the uuid which is going to be an optional
tag in /proc/self/mountinfo.
]]

In the man page, I'd like to briefly describe how one derives such a
persistent ID from mountinfo. AFAICS, the optional UUID tag in
/proc/self/mountinfo has not come to pass. So, what then is the
recommended practice for deriving the persistent ID?

Cheers,

Michael

-- 
Michael Kerrisk Linux man-pages maintainer;
http://www.kernel.org/doc/man-pages/
Author of "The Linux Programming Interface", http://blog.man7.org/
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