JFFS2 & 2.5.59 & FS_REQUIRES_DEV

[Henrik Nordstrom]

While the root= argument is not passed to root filesystems, rootfsflags=
are. So I think you should be able to use something like

devfs=mount root=/dev/root rootfsflags=[mtddevspec]... rootfs=jffs2

then have the filesystem fix up /dev/root.

This is used successfully in UML to mount a non-block root filesystem
(hostfs).

Regards
Henrik



fre 2003-02-07 klockan 10.29 skrev David Woodhouse:
> On Fri, 2003-02-07 at 09:22, Kasparek Tomas wrote:
> > OK, please could you summarize actual state - how it should work without
> > mtdblock device. What is now the right value for 'root='?
> 
> For the root file system, it _doesn't_ work without an mtdblock device.
> You need to specify the device as before. For mounting normally,
> however, you can specify something like 'mtd:jffs2 partition' or 'mtd:1'
> (IIRC -- I'd have to look at the code against to confirm the latter) to
> mount by MTD device name or number, with no need to use the mtdblock
> devices.
> 
> If the mechanism for mounting the root file system would pass the
> contents of the 'root=' command line argument in to the file system,
> then we could do it for the root file system too. But it doesn't so we
> can't -- until it gets fixed. So it's not just get_fs_names() that wants
> changing, but the whole way in which we use the 'root=' argument to
> decide on a block device and create a fake /dev/root with the
> appropriate major/minor.
> 
> > If there is some page about this, please give me link(s) too.
> 
> Only fs/jffs2/super.c :)
-- 
Henrik Nordstrom <hno at marasystems.com>
MARA Systems AB