linux-kernel - Re: [PATCH 3/3] init/do_mounts.c: fix rootfs_fs

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Message-ID: <20210524214751.GZ4332@42.do-not-panic.com>
Date:   Mon, 24 May 2021 21:47:51 +0000
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     menglong8.dong@...il.com
Cc:     viro@...iv.linux.org.uk, keescook@...omium.org,
        samitolvanen@...gle.com, johan@...nel.org, ojeda@...nel.org,
        jeyu@...nel.org, joe@...ches.com, dong.menglong@....com.cn,
        masahiroy@...nel.org, jack@...e.cz, axboe@...nel.dk, hare@...e.de,
        gregkh@...uxfoundation.org, tj@...nel.org, song@...nel.org,
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        f.fainelli@...il.com, wangkefeng.wang@...wei.com, arnd@...db.de,
        linux@...musvillemoes.dk, mhiramat@...nel.org, rostedt@...dmis.org,
        vbabka@...e.cz, glider@...gle.com, pmladek@...e.com,
        ebiederm@...ssion.com, jojing64@...il.com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] init/do_mounts.c: fix rootfs_fs_type with ramfs

On Sat, May 22, 2021 at 07:31:55PM +0800, menglong8.dong@...il.com wrote:
> From: Menglong Dong <dong.menglong@....com.cn>
> 
> As for the existence of 'user root' which is introduced in previous
> patch, 'rootfs_fs_type', which is used as the root of mount tree,
> is not used directly any more. So it make no sense to switch it
> between ramfs and tmpfs, just fix it with ramfs to simplify the
> code.
> diff --git a/init/do_mounts.c b/init/do_mounts.c
> index 943cb58846fb..6d1253f75bb0 100644
> --- a/init/do_mounts.c
> +++ b/init/do_mounts.c
> @@ -689,24 +689,8 @@ void __init init_user_rootfs(void)
>  	}
>  }
>  
> -static bool is_tmpfs;
> -static int rootfs_init_fs_context(struct fs_context *fc)
> -{
> -	if (IS_ENABLED(CONFIG_TMPFS) && is_tmpfs)
> -		return shmem_init_fs_context(fc);
> -
> -	return ramfs_init_fs_context(fc);
> -}
> -
>  struct file_system_type rootfs_fs_type = {

Then why not also just rename rootfs_fs_type to ram_rootfs_fs_type to
make this even clearer now?

>  	.name		= "rootfs",
> -	.init_fs_context = rootfs_init_fs_context,
> +	.init_fs_context = ramfs_init_fs_context,
>  	.kill_sb	= kill_litter_super,
>  };

  Luis