I've just tried putting usr in a subvol. Installation proceeds normally, no errors, but I'm dropped to a dracut prompt which indicates mount of /usr failed. dmesg follows:[ 14.025215] systemd[1]: Starting dracut initqueue hook... [ 14.077890] Btrfs loaded [ 14.129987] device label fedora_f18v devid 1 transid 31 /dev/sda1 [ 14.313607] device label fedora_f18v devid 1 transid 31 /dev/sda1 [ 14.446523] systemd[1]: Started Show Plymouth Boot Screen. [[1;32m OK [[ 14.533662] btrfs: disk space caching is enabled 0m] Started Show Plymouth Boot Screen. [ 14.534404] systemd[1]: Started Dispatch Password Requests to Console Directory Watch. [ 14.534886] systemd[1]: Starting Forward Password Requests to Plymouth Directory Watch. [ 14.535001] systemd[1]: Started Forward Password Requests to Plymouth Directory Watch. [ 14.535067] systemd[1]: Starting Basic System. [[1;32m OK [0m] Reached target Basic System.[ 15.053733] systemd[1]: Reached target Basic System. [ 15.094806] device label fedora_f18v devid 1 transid 31 /dev/sda1 [ 15.251736] btrfs: disk space caching is enabled [ 15.430129] systemd[1]: Started dracut initqueue hook. [ 15.574280] systemd[1]: Starting dracut pre-pivot and cleanup hook... [ 15.735181] device label fedora_f18v devid 1 transid 31 /dev/sda1 [ 15.876950] btrfs: 'root' is not a valid subvolume dracut-pre-pivot[228]: Warning: Mounting /usr to /sysroot/usr failed dracut-pre-pivot[228]: Warning: *** Dropping you to a shell; the system will continue dracut-pre-pivot[228]: Warning: *** when you leave the shell. dracut-pre-pivot[228]: Warning: [[1;32m OK [0m] Started Show Plymouth Boot Screen. [[1;32m OK [0m] Reached target Basic System. dracut-pre-pivot[228]: Warning: Mounting /usr to /sysroot/usr failed dracut-pre-pivot[228]: Warning: *** Dropping you to a shell; the system will continue dracut-pre-pivot[228]: Warning: *** when you leave the shell. dracut-pre-pivot[228]: Warning: [ 16.314849] systemd[1]: Starting Emergency Shell… After a bit of snooping I found the dracut fstab suspicious: dracut:/# cat /etc/fstab /dev/disk/by-uuid/64383cfe-c31d-4d25-97c4-4e6b7e788b26 /sysroot btrfs subvol=root,ro 0 /dev/disk/by-uuid/64383cfe-c31d-4d25-97c4-4e6b7e788b26 /sysroot/usr btrfs subvol=usr,subvol=root,ro 1 2 Two mount options, mounting two subvols to the same mount point? Seems problematic. But even when I try what I think is correct from a dracut prompt: dracut:/# mount -o subvol=usr /dev/sda1 /sysroot/usr mount: /dev/sda1 is already mounted or /sysroot/usr busy /dev/sda1 is already mounted on /sysroot The only sda device mounted at this time is the root subvol to /sysroot. So the additional question is if dracut maybe has a problem with multiple physical devices being mounted more than once, which is what happens when mounting multiple subvols? This is dracut-024-17.git20121220.fc18. Seems like maybe two bugs?
/dev/disk/by-uuid/64383cfe-c31d-4d25-97c4-4e6b7e788b26 /sysroot/usr btrfs subvol=usr,subvol=root,ro 1 2
I'd say that the problem is definitely with this line having two subvolumes listed. Maybe you should boot from a live CD, mount your subvolid=1 and check out what subvolumes you really have in there. And then re-write fstab manually. If you have /sysroot subvolume, you can create /sysroot/usr as a child subvolume and you won't even need then to specify /sysroot/usr in your fstab because it will be mounted automatically when the parent subvolume gets mounted.
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