On Tue, May 25, 2021 at 10:15:21PM +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 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'. This looks much better, thank you; this addresses all my concerns with v1. I appreciate having the config option to control this as well.
