linux-kernel - Re: [PATCH] init/do_mounts.c : Create /root if it does not exits

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Date:	Wed, 30 Nov 2011 12:55:55 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	yanhong <tempname2@...mail.com>
Cc:	<linux-kernel@...r.kernel.org>, linux-fsdevel@...r.kernel.org,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH] init/do_mounts.c : Create /root if it does not exits

On Sat, 26 Nov 2011 08:34:18 +0000
yanhong <tempname2@...mail.com> wrote:

> 
> From: YanHong <tempname2@...mail.com>
> 
> If someone supplies an initramfs without /root in it, and we fail to execute rdinit, we will try to mount root device and fail, for the mount point does not exits. 
> 
> But we get error message "VFS: Cannot open root device". It's confusing. 
> 
> We can give more detailed error message, or we can go further: if /root does not exits,  create one.
> 

I really don't know enough about initramfs usage to know if this is a
good or bad thing.  Can anyone else comment?

> --- a/init/do_mounts.c
> +++ b/init/do_mounts.c
> @@ -350,6 +350,9 @@ void __init mount_block_root(char *name, int flags)
>         const char *b = name;
>  #endif
> 
> +       if (sys_access((const char __user *) "/root", 0) != 0)
> +               sys_mkdir((const char __user *) "/root", 0700);
> +
>         get_fs_names(fs_names);
>  retry:
>         for (p = fs_names; *p; p += strlen(p)+1) {

I suppose we could remove the sys_access() check and just run mkdir(),
which will fail to do anything if /root already exists.
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