Re: [PATCH RFC v2] fhandle: expose u64 mount id to name_to_handle_at(2)

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To: Trond Myklebust <trondmy@xxxxxxxxxxxxxxx>
Subject: Re: [PATCH RFC v2] fhandle: expose u64 mount id to name_to_handle_at(2)
From: "hch@xxxxxxxxxxxxx" <hch@xxxxxxxxxxxxx>
Date: Mon, 27 May 2024 04:49:10 -0700
Cc: "cyphar@xxxxxxxxxx" <cyphar@xxxxxxxxxx>, "hch@xxxxxxxxxxxxx" <hch@xxxxxxxxxxxxx>, "jack@xxxxxxx" <jack@xxxxxxx>, "brauner@xxxxxxxxxx" <brauner@xxxxxxxxxx>, "linux-fsdevel@xxxxxxxxxxxxxxx" <linux-fsdevel@xxxxxxxxxxxxxxx>, "linux-api@xxxxxxxxxxxxxxx" <linux-api@xxxxxxxxxxxxxxx>, "chuck.lever@xxxxxxxxxx" <chuck.lever@xxxxxxxxxx>, "alex.aring@xxxxxxxxx" <alex.aring@xxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "viro@xxxxxxxxxxxxxxxxxx" <viro@xxxxxxxxxxxxxxxxxx>, "jlayton@xxxxxxxxxx" <jlayton@xxxxxxxxxx>, "amir73il@xxxxxxxxx" <amir73il@xxxxxxxxx>, "linux-nfs@xxxxxxxxxxxxxxx" <linux-nfs@xxxxxxxxxxxxxxx>
In-reply-to: <30137c868039a3ae17f4ae74d07383099bfa4db8.camel@hammerspace.com>

On Sun, May 26, 2024 at 10:32:39PM +0000, Trond Myklebust wrote:
> I assume the reason is to give the caller a race free way to figure out
> which submount the path resolves to.

But the handle op are global to the file systems (aka super_block).  It
does not matter what mount you use to access it.

Snip random things about userland NFS servers I couldn't care less
about..

Follow-Ups:
- Re: [PATCH RFC v2] fhandle: expose u64 mount id to name_to_handle_at(2)
  - From: Trond Myklebust

References:
- [PATCH RFC v2] fhandle: expose u64 mount id to name_to_handle_at(2)
  - From: Aleksa Sarai
- Re: [PATCH RFC v2] fhandle: expose u64 mount id to name_to_handle_at(2)
  - From: Christoph Hellwig
- Re: [PATCH RFC v2] fhandle: expose u64 mount id to name_to_handle_at(2)
  - From: Trond Myklebust

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