linux-kernel - Re: [PATCH 30/32] vfs: Allow cloning of a mount tree with open(O_PATH|O_CLONE

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Message-ID: <20180601062654.GA32397@infradead.org>
Date:   Thu, 31 May 2018 23:26:54 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     David Howells <dhowells@...hat.com>
Cc:     viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
        linux-afs@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-api@...r.kernel.org
Subject: Re: [PATCH 30/32] vfs: Allow cloning of a mount tree with
 open(O_PATH|O_CLONE_MOUNT) [ver #8]

On Fri, May 25, 2018 at 01:08:38AM +0100, David Howells wrote:
> Make it possible to clone a mount tree with a new pair of open flags that
> are used in conjunction with O_PATH:
> 
>  (1) O_CLONE_MOUNT - Clone the mount or mount tree at the path.
> 
>  (2) O_NON_RECURSIVE - Don't clone recursively.

Err.  I don't think we should use up two O_* flags for something
only useful for your new mount API.  Don't we have a better place
to for these flags?

Instead of overloading this on open having a specific syscalls just
seems like a much saner idea.