On Wed, Mar 18, 2015 at 01:42:55PM -0700, K Richard Pixley wrote: > I'm having trouble deleting a subvolume. > > [root@new-alfred ~]# uname -a > Linux new-alfred.corp.graphitesystems.com 3.10.0-123.el7.x86_64 #1 > SMP Mon May 5 11:16:57 EDT 2014 x86_64 x86_64 x86_64 GNU/Linux > [root@new-alfred ~]# btrfs --version > Btrfs v3.16.2 > [root@new-alfred ~]# btrfs fi show > Label: 'rhel_bark' uuid: d3c6c783-c190-4675-99f2-b83f3c462656 > Total devices 2 FS bytes used 14.25GiB > devid 1 size 461.38GiB used 7.03GiB path /dev/sda2 > devid 2 size 465.76GiB used 12.01GiB path /dev/sdb1 > > Btrfs v3.16.2 > [root@new-alfred ~]# btrfs fi df / > Data, single: total=15.01GiB, used=13.19GiB > System, RAID1: total=8.00MiB, used=16.00KiB > System, single: total=4.00MiB, used=0.00 > Metadata, RAID1: total=2.00GiB, used=1.07GiB > Metadata, single: total=8.00MiB, used=0.00 > [root@new-alfred ~]# btrfs subvolume list / > ID 257 gen 1483 top level 5 path root > ID 258 gen 1466 top level 5 path home > [root@new-alfred ~]# btrfs subvolume delete home > Transaction commit: none (default) > ERROR: error accessing 'home' > [root@new-alfred ~]# btrfs subvolume delete /home > Transaction commit: none (default) > ERROR: error accessing '/home' > > What format do I need to use to delete the "home" subvolume?
I'm guessing you've got the home subvolume mounted, something like: # mount /dev/sda2 /home -o subvol=home You can't delete that while it's mounted, because you'd be trying to delete the subvolume out from under the mountpoint. So the first thing is to unmount it. Then the syntax to delete a subvolume is: # btrfs sub del /path/to/subvolume ... but at the moment, you can't see the subvolume, because it's not mounted, and there's no way to see it. The trick here it to mount something higher than the subvolume you want to operate on, and access it through that mount path. So, mount the top level subvolume somewhere: # mount /dev/sda2 /media/btrfs -o subvolid=0 then delete the subvolume through that: # btrfs sub del /media/btrfs/home In fact, I'd recommend doing _all_ subvolume management operations (and nothing else) through the top-level mount at /media/btrfs. Hugo. -- Hugo Mills | "There's a Martian war machine outside -- they want hugo@... carfax.org.uk | to talk to you about a cure for the common cold." http://carfax.org.uk/ | PGP: 65E74AC0 | Stephen Franklin, Babylon 5
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