Hi, We want to be able to compile in virtiofs/9pfs in kernel and then boot kernel and mount virtiofs/9pfs as root filesystem. Currently there does not seem to be any good way to be able to do that. There seem to be some hacky ways like prefixing filesystem tag with "mtd" or naming the filesystem tag as "/dev/root" to mount viritofs. Both viritofs and 9pfs have the notion of a "tag" to mount a filesystem and they take this "tag" as a source argument of the mount. Filesystem understands how to handle the tag. Current code already has hooks to mount mtd/ubi/cifs/nfs root filesystems (apart of regular block based filesystems). So intead of creating two separate hooks for two filesystems, I have tried creating a hook for tag based filesystems. And now both the filesystems benefit from it. This is generic enough that I think many more use cases might be able to take advantage of it down the line. Vivek Goyal (2): init/do_mounts.c: Add a path to boot from tag based filesystems init/do_mounts.c: Add 9pfs to the list of tag based filesystems init/do_mounts.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) -- 2.25.4
