Re: [PATCH v6 0/2] init/initramfs.c: make initramfs support pivot_root

[Menglong Dong]

On Wed, Jun 09, 2021 at 11:03:12PM +0900, Masami Hiramatsu wrote:
> On Sat,  5 Jun 2021 11:44:45 +0800
> menglong8.dong@xxxxxxxxx wrote:
> 
> > From: Menglong Dong <dong.menglong@xxxxxxxxxx>
> > 
> > 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@xxxxxxxxxx/)
> > 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@xxxxxxxxxx>
> 
> Thank you,
> 

Ok, thank you :/

Menglong Dong