Extending zfsboot.c to allow selecting filesystem from boot.config

[Andriy Gapon]

on 15/10/2011 22:43 Florian Wagner said the following:
> Hi,
> 
> from looking at the code in sys/boot/i386/zfsboot/zfsboot.c the ZFS aware
> boot block already allows to select pool to load the kernel from by adding
> <POOL>:<FILE TO BOOT> to the boot.config. As this code calls the
> zfs_mount_pool function it will look for the bootfs property on the new
> pool or use its root dataset to get the file from there.
> 
> How much work would it be to extend the loader to also allow selecting a
> ZFS filesystem?
> 
> What I'd like to do is place a boot.config on the (otherwise empty) root of
> my system pool and then tell it to get the loader from another filesystem
> by putting "rpool/root/stable-8-r226381:/boot/zfsloader" in there.

Please check out the following changes:
https://gitorious.org/~avg/freebsd/avgbsd/commit/8c3808c4bb2a2cd746db3e9c46871c9bdf943ef6
https://gitorious.org/~avg/freebsd/avgbsd/commit/0b4279c0d366d9f2b5bb9d4c0dd3229d8936d92b
https://gitorious.org/~avg/freebsd/avgbsd/commit/b29ab78b079f27918de1683e88bcb1817a0e5969
https://gitorious.org/~avg/freebsd/avgbsd/commit/f49add15516dfd582258b6820b8f0254cf9419a3
https://gitorious.org/~avg/freebsd/avgbsd/commit/e072b443b0f59fe1ff54a70d2437d63698bbf597
https://gitorious.org/~avg/freebsd/avgbsd/commit/f701760c10812c5b6925352fb003408c19170063

-- 
Andriy Gapon