On Thu, Jul 25, 2019 at 04:49:34PM -0400, Vivek Goyal wrote: > Hi Stefan, > > I think following patch might allow you to mount virtio_fs as rootfs > with new syntax.
Thanks, I've sent a similar patch too. My patch changes mount_root() (where the nfs root code also lives) and uses do_mount_root() instead of mount_block_root() to avoid block/partition error messages. But I think they are very similar in terms of functionality. > I have only compiled it and not tested it. Plase have a look. > > Thanks > Vivek > > virtio_fs passes root=<fs-instance-name> as identifier of virtio_fs instance > to be mounted. None of the existing primitives seems to fit virito_fs needs. > > So check rootfstype and if it is "virtio_fs", do not parse root= further > and call mount_block_root(). > > This is similar to carving out special paths for ubifs. Now virtio_fs > users should be able to pass "root=myfs rootfstype=virtio_fs" and be > able to mount that particular instance of virtio_fs as rootfs. > > Yet-To-Be-Signed-off-by: Vivek Goyal <[email protected]> > --- > init/do_mounts.c | 4 ++++ > 1 file changed, 4 insertions(+) > > Index: rhvgoyal-linux-fuse/init/do_mounts.c > =================================================================== > --- rhvgoyal-linux-fuse.orig/init/do_mounts.c 2019-04-09 15:42:17.096602971 > -0400 > +++ rhvgoyal-linux-fuse/init/do_mounts.c 2019-07-25 16:40:29.226348627 > -0400 > @@ -595,6 +595,10 @@ void __init prepare_namespace(void) > mount_block_root(root_device_name, root_mountflags); > goto out; > } > + if (root_fs_names && !strncmp(root_fs_names, "virtio_fs", 3)) { The entire string, not just the first 3 characters: !strcmp(root_fs_names, "virtio_fs")
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