Andrew Benton wrote: > The problem is that nilfs-cleanerd looks in /proc/mounts to see which > device node in /dev it should be working on. If you cat /proc/mounts > you'll see that / is listed as /dev/root which doesn't exist on an > LFS system so nilfs-cleanerd quits,
That's broken. I'd file a bug with whoever wrote that code... :-) > The solution I devised is to create a symlink /dev/root pointing at > the root partition. This has to be done before the filesystem is > mounted. Before the nilfs2 FS is mounted, I assume you mean. Because it doesn't make much difference whether the symlink exists before the rootfs is mounted -- the kernel (or initramfs...) does that before any bootscripts run, anyway. > The kernel knows where the root is because it was passed it as an > argument by grub, it's available in /proc/cmdline Yes, but the value is not necessarily symlinkable: an NFS mount target is not, for instance. I wouldn't be surprised if nilfs-cleanerd choked on that as well; the best fix here (IMO) is to change nilfs-cleanerd to special-case the rootfs, or (if that's impossible because your rootfs is nilfs2) use an initramfs, since you'll need that anyway. > Is there a simpler way to get awk to print all the fields at one go? > Or would some other tool (perl?) be more appropriate? That's the main > reason I wrote this email, for a bit of scripting advice. Shouldn't be needed. Relying on the presence of /dev/root on the actual filesystem seems broken to me; it *only* exists in the case where the kernel has its own internal "initramfs" type setup, which does have this "file". :-) > Ideally I'd like udev to create the symlink, but I don't know how to > do that. It'd have to grep /proc/cmdline for every disk partition. See: http://marc.info/?l=linux-hotplug&m=117715210620479&w=2 and: http://marc.info/?l=linux-hotplug&m=117725092825439&w=2 for the udev side of things (unsurprisingly, this has come up before... :-) ). And indeed, on a system using an initramfs: $ head -n 2 /proc/mounts rootfs / rootfs rw 0 0 /dev/dm-6 / ext3 rw,relatime,errors=continue,data=journal 0 0 it looks fine. (Well, "fine" inasmuch as /dev/dm-6 is the final device node that the initramfs used. It actually mounted one of the persistent symlinks under /dev/disk/by-label/, but it looks like mount(8) resolved that link itself, before calling into the kernel.) I have no idea whether nilfs-cleanerd will work here or not (given the "rootfs" entry).
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