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);
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Harald Glatt
2013-May-03 20:45 UTC
Re: grub/grub2 boot into btrfs raid root and with no initrd
On Fri, May 3, 2013 at 10:42 PM, Martin <m_btrfs@ml1.co.uk> 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@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.htmlThe 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@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html