Re: [BusyBox] [Fwd: Loopback device setup?]

[Tom Guilliams]

Thanks to all who responded.  I have a 2.4.20 kernel so mounting on the 
tmpfs is not supported.  I have found an alternative by using the ram 
device nodes for storage.

Thanks again,

Tom

Hugh Dickins wrote:
> On Tue, 17 Feb 2004, vda wrote:
>
> > On Tuesday 17 February 2004 02:20, Tom Guilliams wrote:
> >
> > > in /driver/block/loop.c -
> > >
> > > loop_set_fd()
> > >
> > > 		/*
> > >                  * If we can't read - sorry. If we only can't write -
> > >                 		 * well, it's going to be read-only.
> > >                  */
> > >                 if (!aops->readpage)
> > >                         goto out_putf;
> > >
> > > I confirmed the "if (!aops->readpage)" is true.  I'm not sure what the
> > > readpage routine is trying to do (which dev or file) in my command below -
> > > # mount -t ext2 -o loop ramdisk.image rootfs
> > >
> > > Anyone have any thoughts??  This is all being done in the /tmp
> > > dircectory which is mounted as "tmpfs".  Not sure if that has anything
> > > to do with it.
> >
> > I recall that tmpfs cannot do readpage (by design?).
> > CCing LKML, maybe someone will pour in more info.
>
>
> readpage is not straightforward for tmpfs, so it took a long time
> to be added, but tmpfs has supported loop since 2.4.22 and 2.5.45.
>
> Hugh
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