linux-kernel - Re: [PATCH 30/38] vfs: syscall: Add fsmount() to create a mount for a superblock [ver #10]

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Message-ID: <9160.1532729381@warthog.procyon.org.uk>
Date:   Fri, 27 Jul 2018 23:09:41 +0100
From:   David Howells <dhowells@...hat.com>
To:     Andy Lutomirski <luto@...capital.net>
Cc:     dhowells@...hat.com, Al Viro <viro@...iv.linux.org.uk>,
        Linux API <linux-api@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 30/38] vfs: syscall: Add fsmount() to create a mount for a superblock [ver #10]

Andy Lutomirski <luto@...capital.net> wrote:

> int mfd = fsmount(...);
> 
> where you pass in an fscontext fd and get out an fd referring to the
> root of the filesystem?  In this case, maybe fs_open_root(2) would be
> a better name.

It's not necessarily the root of the filesystem in the sense of sb->s_root.
It might be a subset of that, or it might be a part of a filesystem that might
have multiple roots because it doesn't know where the real root is (NFS2, for
example).

> This *definitely* needs to be clearer in the description.

I'm open to suggestions of better wording.  It's a bit hard to explain
because, as you pointed out, the terminology is overloaded.

David