From adcee9973be59dbc30a69ce65a8acae3308f692a Mon Sep 17 00:00:00 2001
From: Stefan Hajnoczi <stefanha@redhat.com>
Date: Fri, 6 Sep 2019 11:03:24 +0100
Subject: [PATCH] init/do_mounts.c: add virtiofs root fs support
Make it possible to boot directly from a virtiofs file system with tag
'myfs' using the following kernel parameters:
rootfstype=virtiofs root=myfs rw
Booting directly from virtiofs makes it possible to use a directory on
the host as the root file system. This is convenient for testing and
situations where manipulating disk image files is cumbersome.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
init/do_mounts.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/init/do_mounts.c b/init/do_mounts.c
index a78e44ee6adb8..e66b472cb8caa 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -552,6 +552,16 @@ void __init mount_root(void)
return;
}
#endif
+#ifdef CONFIG_VIRTIO_FS
+ if (root_fs_names && !strcmp(root_fs_names, "virtiofs")) {
+ if (!do_mount_root(root_device_name, "virtiofs",
+ root_mountflags, root_mount_data))
+ return;
+
+ panic("VFS: Unable to mount root fs \"%s\" from virtiofs",
+ root_device_name);
+ }
+#endif
#ifdef CONFIG_BLOCK
{
int err = create_dev("/dev/root", ROOT_DEV);
--
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