Hi Menglong, On Fri, 28 May 2021 22:37:59 +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. > > > Changes since V2: > > In the first patch, I use vfs_path_lookup() in init_eaccess() to make the > path lookup follow the mount on '/'. After this, the problem reported by > Masami Hiramatsu is solved. Thanks for your report :/ Thank you for the fix, I confirmed that the issue has been solved with this. Tested-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx> for this series. Regards, > > > Changes since V1: > > In the first patch, I add the flag LOOKUP_DOWN to init_eaccess(), to make > it support the check of filesystem mounted on '/'. > > In the second patch, I control 'user root' with kconfig option > 'CONFIG_INITRAMFS_USER_ROOT', and add some comments, as Luis Chamberlain > suggested. > > In the third patch, I make 'rootfs_fs_type' in control of > 'CONFIG_INITRAMFS_USER_ROOT'. > > > > Menglong Dong (3): > init/main.c: introduce function ramdisk_exec_exist() > init/do_cmounts.c: introduce 'user_root' for initramfs > init/do_mounts.c: fix rootfs_fs_type with ramfs > > fs/init.c | 11 ++++- > include/linux/init.h | 5 ++ > init/do_mounts.c | 109 +++++++++++++++++++++++++++++++++++++++++++ > init/do_mounts.h | 18 ++++++- > init/initramfs.c | 10 ++++ > init/main.c | 7 ++- > usr/Kconfig | 10 ++++ > 7 files changed, 166 insertions(+), 4 deletions(-) > > -- > 2.32.0.rc0 > -- Masami Hiramatsu <mhiramat@xxxxxxxxxx>
