linux-kernel - Re: [PATCH] fs: Add 'rootfsflags' to set rootfs mount options

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Message-ID: <feadab5e-915c-44ae-a1a2-46a2efc5f113@landley.net>
Date: Sat, 9 Aug 2025 10:02:09 -0500
From: Rob Landley <rob@...dley.net>
To: Lichen Liu <lichliu@...hat.com>, viro@...iv.linux.org.uk,
 brauner@...nel.org
Cc: kexec@...ts.infradead.org, linux-kernel@...r.kernel.org,
 weilongchen@...wei.com
Subject: Re: [PATCH] fs: Add 'rootfsflags' to set rootfs mount options

On 8/7/25 20:51, Lichen Liu wrote:
> This patch introduces a new kernel command-line parameter, rootfsflags,
> which allows passing specific mount options directly to the rootfs when
> it is first mounted. This gives users control over the rootfs behavior.

Works for me. In an i486 mkroot build against stock 6.16 with this patch:

$ root/i486/run-qemu.sh
...
# grep rootfs /proc/mounts
rootfs / rootfs rw,size=125728k,nr_inodes=31432 0 0
# df
Filesystem     1K-blocks Used Available Use% Mounted on
rootfs            125728  764    124964   1% /
dev               125728    0    125728   0% /dev


$ KARGS="rootfsflags=size=1m" root/i486/run-qemu.sh
...
# grep rootfs /proc/mounts
rootfs / rootfs rw,size=1024k,nr_inodes=31432 0 0
# df
Filesystem     1K-blocks Used Available Use% Mounted on
rootfs              1024  764       260  75% /
dev               125728    0    125728   0% /dev

Tested-by: Rob Landley <rob@...dley.net>

Rob