Re: [PATCH] rootfs: Fix support for rootfstype= when root= is given

From: Greg KH
Date: Tue Nov 14 2023 - 08:19:20 EST

On Mon, Nov 13, 2023 at 04:17:35PM -0500, Stefan Berger wrote:
> Documentation/filesystems/ramfs-rootfs-initramfs.rst states:
> If CONFIG_TMPFS is enabled, rootfs will use tmpfs instead of ramfs by
> default. To force ramfs, add "rootfstype=ramfs" to the kernel command
> line.
> This currently does not work when root= is provided since then
> saved_root_name contains a string and initfstype= is ignored. Therefore,
> ramfs is currently always chosen when root= is provided.
> The current behavior for rootfs's filesystem is:
> root= | initfstype= | chosen rootfs filesystem
> ------------+-------------+--------------------------
> unspecified | unspecified | tmpfs
> unspecified | tmpfs | tmpfs
> unspecified | ramfs | ramfs
> provided | ignored | ramfs
> initfstype= should be respected regardless whether root= is given,
> as shown below:
> root= | initfstype= | chosen rootfs filesystem
> ------------+-------------+--------------------------
> unspecified | unspecified | tmpfs (as before)
> unspecified | tmpfs | tmpfs (as before)
> unspecified | ramfs | ramfs (as before)
> provided | unspecified | ramfs (compatibility with before)
> provided | tmpfs | tmpfs (new)
> provided | ramfs | ramfs (new)
> This table represents the new behavior.
> Fixes: 6e19eded3684 ("initmpfs: use initramfs if rootfstype= or root= specified")
> Reviewed-by: Stefan Berger <stefanb@xxxxxxxxxxxxx>
> Signed-off-by: Rob Landley <rob@xxxxxxxxxxx>
> Signed-off-by: Stefan Berger <stefanb@xxxxxxxxxxxxx>
> ---
> init/do_mounts.c | 9 ++++++---
> 1 file changed, 6 insertions(+), 3 deletions(-)


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