linux-kernel - Re: [PATCH RFC v2] fhandle: expose u64 mount id to name_to_handle

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Message-ID: <ZlMADupKkN0ITgG5@infradead.org>
Date: Sun, 26 May 2024 02:25:34 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Aleksa Sarai <cyphar@...har.com>
Cc: Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
	Chuck Lever <chuck.lever@...cle.com>,
	Jeff Layton <jlayton@...nel.org>,
	Amir Goldstein <amir73il@...il.com>,
	Alexander Aring <alex.aring@...il.com>,
	linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org
Subject: Re: [PATCH RFC v2] fhandle: expose u64 mount id to
 name_to_handle_at(2)

On Thu, May 23, 2024 at 01:57:32PM -0700, Aleksa Sarai wrote:
> Now that we provide a unique 64-bit mount ID interface in statx, we can
> now provide a race-free way for name_to_handle_at(2) to provide a file
> handle and corresponding mount without needing to worry about racing
> with /proc/mountinfo parsing.

file handles are not tied to mounts, they are tied to super_blocks,
and they can survive reboots or (less relevant) remounts.  This thus
seems like a very confusing if not wrong interfaces.