linux-kernel - Re: [PATCH v6 0/2] init/initramfs.c: make initramfs support pivot

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Date:   Wed, 9 Jun 2021 23:36:21 -0700
From:   Menglong Dong <menglong8.dong@...il.com>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     christian.brauner@...ntu.com, viro@...iv.linux.org.uk,
        keescook@...omium.org, samitolvanen@...gle.com, johan@...nel.org,
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Subject: Re: [PATCH v6 0/2] init/initramfs.c: make initramfs support
 pivot_root

On Wed, Jun 09, 2021 at 11:03:12PM +0900, Masami Hiramatsu wrote:
> On Sat,  5 Jun 2021 11:44:45 +0800
> menglong8.dong@...il.com wrote:
> 
> > From: Menglong Dong <dong.menglong@....com.cn>
> > 
> > As Luis Chamberlain suggested, I split the patch:
> > [init/initramfs.c: make initramfs support pivot_root]
> > (https://lore.kernel.org/linux-fsdevel/20210520154244.20209-1-dong.menglong@zte.com.cn/)
> > into three.
> > 
> > The goal of the series patches is to make pivot_root() support initramfs.
> > 
> > In the first patch, I introduce the function ramdisk_exec_exist(), which
> > is used to check the exist of 'ramdisk_execute_command' in LOOKUP_DOWN
> > lookup mode.
> > 
> > In the second patch, I create a second mount, which is called
> > 'user root', and make it become the root. Therefore, the root has a
> > parent mount, and it can be umounted or pivot_root.
> > 
> > In the third patch, I fix rootfs_fs_type with ramfs, as it is not used
> > directly any more, and it make no sense to switch it between ramfs and
> > tmpfs, just fix it with ramfs to simplify the code.
> 
> Hi,
> 
> I have tested this series on qemu with shell script container on initramfs.
> It works for me!
> 
> Tested-by: Masami Hiramatsu <mhiramat@...nel.org>
> 
> Thank you,
> 

Ok, thank you :/

Menglong Dong