On 12/28/2012 10:44 AM, Chris Murphy wrote:
On Dec 27, 2012, at 6:13 PM, dima <[email protected]> wrote:
/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.
When I mount subvolid=5 there are subvols root, boot, usr, var, home. And the
/etc/fstab in root is:
#
# /etc/fstab
# Created by anaconda on Thu Dec 27 15:21:03 2012
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=64383cfe-c31d-4d25-97c4-4e6b7e788b26 / btrfs
subvol=root 1 1
UUID=64383cfe-c31d-4d25-97c4-4e6b7e788b26 /boot btrfs
subvol=boot 1 2
UUID=64383cfe-c31d-4d25-97c4-4e6b7e788b26 /home btrfs
subvol=home 1 2
UUID=64383cfe-c31d-4d25-97c4-4e6b7e788b26 /usr btrfs
subvol=usr 1 2
UUID=64383cfe-c31d-4d25-97c4-4e6b7e788b26 /var btrfs
subvol=var 1 2
It's correct.
Seems dracut is creating the wrong fstab for itself, but then also can't mount
it correctly manually from a shell command. When booted in rescue mode to a
full system, not just a dracut shell, I can mount -o subvol=root to one mount
point, and also mount -o subvol=usr to another mountpoint (within or outside
the former mount point) without error.
Then I guess all is fine with subvolumes and something is strange with
the way fedora is handling those. Because it is the temporary ro mount
that fails.
The only thing I can recommend is to first create all needed subvolumes,
then install the minimal OS manually from CLI and configure your grub
and fstab by hand.
Can't really help with dracut troubleshooting..
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.
It's a useful work around. I'd like to narrow down if the real problem is
dracut and if it should eventually be fixed. Seems both need fixing.
Chris Murphy--
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