How to set USER_SUBVOL_RM_ALLOWED capability?

Question

I try to remove btrfs snapshot as a normal user. I've read, that a user needs to have some special capability/right set: USER_SUBVOL_RM_ALLOWED. How to grant such capability to user??

The second answer to that question says there's a mount option to enable that. Did you try it? — muru, Aug 10 '14 at 09:54
Yes. with sudo mount -t btrfs -o USER_SUBVOL_RM_ALLOWED,compress,rw,noacl,noatime,autodefrag /dev/mapper/adam-docs /home/Adama-docs/Adam with no effect. — Adam Ryczkowski, Aug 10 '14 at 10:43
@muru, oh, you are right. It failed with bad option error message. — Adam Ryczkowski, Aug 10 '14 at 10:58
I think mount options are case sensitive, and the answer mentioned a lower case option. — muru, Aug 10 '14 at 10:59
Suggest an edit to that answer to make things clearer, if you can. — muru, Aug 10 '14 at 11:14
Sorry for the confusion, I meant the second answer to the linked question. Your own was clear — muru, Aug 10 '14 at 11:24

Adam Ryczkowski · Answer 1 · 2014-08-10T11:22:28.413

This capability concerns mount point, not user (as it is suggested by the referenced question).

To add such capability one must remount/mount the filesystem with -o user_subvol_rm_allowed option (case sensitive).

e.g. this is the mount command I use to mount the btrfs partition with my documents:

sudo mount -t btrfs -o remount,user_subvol_rm_allowed,compress,rw,noacl,noatime,autodefrag /dev/mapper/mydocs /home/adam/docs

How to set USER_SUBVOL_RM_ALLOWED capability?

1 Answers1