linux-kernel - Re: [PATCH v3 07/12] man/man2/fsmount.2: document "new" mount API

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Message-ID: <2025-08-20.1755686261-lurid-sleepy-lime-quarry-j42HLU@cyphar.com>
Date: Wed, 20 Aug 2025 20:38:48 +1000
From: Aleksa Sarai <cyphar@...har.com>
To: Askar Safin <safinaskar@...omail.com>
Cc: Alejandro Colomar <alx@...nel.org>, 
	"Michael T. Kerrisk" <mtk.manpages@...il.com>, Alexander Viro <viro@...iv.linux.org.uk>, 
	Jan Kara <jack@...e.cz>, "G. Branden Robinson" <g.branden.robinson@...il.com>, 
	linux-man <linux-man@...r.kernel.org>, linux-api <linux-api@...r.kernel.org>, 
	linux-fsdevel <linux-fsdevel@...r.kernel.org>, linux-kernel <linux-kernel@...r.kernel.org>, 
	David Howells <dhowells@...hat.com>, Christian Brauner <brauner@...nel.org>
Subject: Re: [PATCH v3 07/12] man/man2/fsmount.2: document "new" mount API

On 2025-08-20, Askar Safin <safinaskar@...omail.com> wrote:
>  ---- On Tue, 12 Aug 2025 18:33:04 +0400  Aleksa Sarai <cyphar@...har.com> wrote --- 
>  >   Unlike open_tree(2) with OPEN_TREE_CLONE, fsmount() can only be called
>  >   once in the lifetime of a filesystem context.
> 
> Weird. open_tree doesn't get filesystem context as argument at all.
> I suggest just this:
> 
>   fsmount() can only be called
>   once in the lifetime of a filesystem context.

The reason I wanted to include the comparison is that you can create
multiple mount objects from the same underlying object using
open_tree(2) but that's not possible with fsmount(2) (at least, not
without creating a new filesystem context each time).

-- 
Aleksa Sarai
Senior Software Engineer (Containers)
SUSE Linux GmbH
https://www.cyphar.com/

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