On Fri, May 3, 2013 at 10:42 PM, Martin <m_btrfs@xxxxxxxxx> wrote: > I've made a few attempts to boot into a root filesystem created using: > > mkfs.btrfs -d raid1 -m raid1 -L btrfs_root_3 /dev/sda3 /dev/sdb3 > > Both grub and grub2 pick up a kernel image fine from an ext4 /boot on > /dev/sda1 for exaample, but then fail to find or assemble the btrfs root. > > Setting up an initrd and grub operates fine for the btrfs raid. > > > What is the special magic to do this without the need for an initrd? > > Is the comment/patch below from last year languishing unknown? Or is > there some problem with that kernel approach? > > > Thanks, > Martin > > > See: > > http://forums.gentoo.org/viewtopic-t-923554-start-0.html > > > Below is my patch, which is working fine for me with 3.8.2. > Code: > > $ cat /etc/portage/patches/sys-kernel/gentoo-sources/earlydevtmpfs.patch > --- init/do_mounts.c.orig 2013-03-24 20:49:53.446971127 +0100 > +++ init/do_mounts.c 2013-03-24 20:51:46.408237541 +0100 > @@ -529,6 +529,7 @@ > create_dev("/dev/root", ROOT_DEV); > if (saved_root_name[0]) { > create_dev(saved_root_name, ROOT_DEV); > + devtmpfs_mount("dev"); > mount_block_root(saved_root_name, root_mountflags); > } else { > create_dev("/dev/root", ROOT_DEV); > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html The initrd has to run btrfs-scan so that btrfs can find the other devices that have btrfs on them. Alternatively you can give all involved devices in the fstab and kernel command line with device=/dev/name -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
