$ fdisk -l
Device Start End Size Type
/dev/sda1 2048 4096 1M BIOS boot partition
/dev/sda2 6144 195371534 93.2G Linux filesystem
$ btrfs subvolume list -p /
ID 261 gen 203517 parent 5 top level 5 path __active
ID 262 gen 203540 parent 261 top level 261 path home
ID 263 gen 203540 parent 261 top level 261 path var
ID 265 gen 203517 parent 261 top level 261 path usr
ID 424 gen 201050 parent 5 top level 5 path __snapshot/my_savepoint-2013-10-28-1382970930
ID 427 gen 203508 parent 5 top level 5 path __snapshot/my_savepoint-2013-11-03-1383505769
ID 428 gen 203508 parent 5 top level 5 path __rollback
$ btrfs subvolume get-default /
ID 261 gen 203517 top level 5 path __active
$ cat /etc/fstab
tmpfs /tmp tmpfs nodev,nosuid,size=2G 0 0
UUID=81410cb0-62ba-408b-a5b2-a8a6354fb090 / btrfs defaults,noatime,compress=lzo 0 0 #,subvol=__active
shm /dev/shm tmpfs nodev,nosuid 0 0
$ grub-mkrelpath /boot/initramfs-linux.img
/boot/initramfs-linux.img
$ cat /boot/grub/grub.cfg
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#
### BEGIN /etc/grub.d/00_header ###
insmod part_gpt
insmod part_msdos
if [ -s $prefix/grubenv ]; then
load_env
fi
if [ "${next_entry}" ] ; then
set default="${next_entry}"
set next_entry=
save_env next_entry
set boot_once=true
else
set default="0"
fi
if [ x"${feature_menuentry_id}" = xy ]; then
menuentry_id_option="--id"
else
menuentry_id_option=""
fi
export menuentry_id_option
if [ "${prev_saved_entry}" ]; then
set saved_entry="${prev_saved_entry}"
save_env saved_entry
set prev_saved_entry=
save_env prev_saved_entry
set boot_once=true
fi
function savedefault {
if [ -z "${boot_once}" ]; then
saved_entry="${chosen}"
save_env saved_entry
fi
}
function load_video {
if [ x$feature_all_video_module = xy ]; then
insmod all_video
else
insmod efi_gop
insmod efi_uga
insmod ieee1275_fb
insmod vbe
insmod vga
insmod video_bochs
insmod video_cirrus
fi
}
if [ x$feature_default_font_path = xy ] ; then
font=unicode
else
insmod part_gpt
insmod btrfs
set root='hd0,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2 81410cb0-62ba-408b-a5b2-a8a6354fb090
else
search --no-floppy --fs-uuid --set=root 81410cb0-62ba-408b-a5b2-a8a6354fb090
fi
font="/usr/share/grub/unicode.pf2"
fi
if loadfont $font ; then
set gfxmode=auto
load_video
insmod gfxterm
set locale_dir=$prefix/locale
set lang=en_US
insmod gettext
fi
terminal_input console
terminal_output gfxterm
set timeout=5
### END /etc/grub.d/00_header ###
### BEGIN /etc/grub.d/10_linux ###
menuentry 'Arch Linux, with Linux core repo kernel' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-core repo kernel-true-81410cb0-62ba-408b-a5b2-a8a6354fb090' {
load_video
set gfxpayload=keep
insmod gzio
insmod part_gpt
insmod btrfs
set root='hd0,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2 81410cb0-62ba-408b-a5b2-a8a6354fb090
else
search --no-floppy --fs-uuid --set=root 81410cb0-62ba-408b-a5b2-a8a6354fb090
fi
echo 'Loading Linux core repo kernel ...'
linux /boot/vmlinuz-linux root=UUID=81410cb0-62ba-408b-a5b2-a8a6354fb090 rw
echo 'Loading initial ramdisk ...'
initrd /boot/initramfs-linux.img
}
menuentry 'Arch Linux, with Linux core repo kernel (Fallback initramfs)' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-core repo kernel-fallback-81410cb0-62ba-408b-a5b2-a8a6354fb090' {
load_video
set gfxpayload=keep
insmod gzio
insmod part_gpt
insmod btrfs
set root='hd0,gpt2'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2 81410cb0-62ba-408b-a5b2-a8a6354fb090
else
search --no-floppy --fs-uuid --set=root 81410cb0-62ba-408b-a5b2-a8a6354fb090
fi
echo 'Loading Linux core repo kernel ...'
linux /boot/vmlinuz-linux root=UUID=81410cb0-62ba-408b-a5b2-a8a6354fb090 rw
echo 'Loading initial ramdisk ...'
initrd /boot/initramfs-linux-fallback.img
}
### END /etc/grub.d/10_linux ###
### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###
### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###
### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###
### BEGIN /etc/grub.d/41_custom ###
if [ -f ${config_directory}/custom.cfg ]; then
source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f $prefix/custom.cfg ]; then
source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###
### BEGIN /etc/grub.d/60_memtest86+ ###
### END /etc/grub.d/60_memtest86+ ###