From: Stefan Hajnoczi <stefanha@redhat.com>
To: virtio-fs@redhat.com
Cc: mszeredi@redhat.com, David Howells <dhowells@redhat.com>,
Al Viro <viro@zeniv.linux.org.uk>,
linux-fsdevel@vger.kernel.org, Vivek Goyal <vgoyal@redhat.com>,
Stefan Hajnoczi <stefanha@redhat.com>
Subject: [PATCH] init/do_mounts.c: add virtiofs root fs support
Date: Fri, 6 Sep 2019 11:03:24 +0100 [thread overview]
Message-ID: <20190906100324.8492-1-stefanha@redhat.com> (raw)
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>
---
This patch is based on linux-next (next-20190904) but should apply
cleanly to other virtiofs trees.
init/do_mounts.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/init/do_mounts.c b/init/do_mounts.c
index 9634ecf3743d..030be2f1999a 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -554,6 +554,16 @@ void __init mount_root(void)
change_floppy("root floppy");
}
#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);
--
2.21.0
next reply other threads:[~2019-09-06 10:03 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-06 10:03 Stefan Hajnoczi [this message]
2019-09-06 19:16 ` [PATCH] init/do_mounts.c: add virtiofs root fs support Richard Weinberger
2019-09-09 7:00 ` Stefan Hajnoczi
2019-09-17 15:18 ` [Virtio-fs] " Stefan Hajnoczi
2019-09-17 18:19 ` Richard Weinberger
2019-09-17 18:30 ` Al Viro
2019-09-17 18:34 ` [Virtio-fs] " Dr. David Alan Gilbert
2019-09-18 10:51 ` Stefan Hajnoczi
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