Enable acl on btrfs device

Software SW tweaks
1

Hi all,

I am trying to enable acl on my external btrfs devices. However, if I add defaults,acl as mount options, the device will not get mounted until I remove the mount option line. I am wondering why acl is not enabled by default and how to enable them manually?

Thanks

2

According to this there is only option noacl available. So should be mounted with acl by default.

3

Yes, I also though that I can only disable the use of acl. However:

# cat /etc/config/fstab  
config mount
	option enabled '1'
	option uuid 'XXXXXXXX-824d-4d68-8b32-XXXXXXXX'
	option target '/mnt/parity1

# mount | grep parity1
/dev/sda on /mnt/parity1 type btrfs (rw,relatime,noacl,space_cache,subvolid=5,subvol=/)

So acl is disabled by something different than fstab

4

Found it…

   root@kukuzi:~# mount -o acl /dev/sda1 /mnt/msata/
   mount: wrong fs type, bad option, bad superblock on /dev/sda1,
   missing codepage or helper program, or other error

   In some cases useful info is found in syslog - try
   dmesg | tail or so.
   root@kukuzi:~# dmesg |tail
   [ 2480.963838] BTRFS error (device sda1): support for ACL not compiled in!
   [ 2481.000744] BTRFS: open_ctree failed
   root@kukuzi:~#

Error in detail: no support in kernel.

5

Oha, thanks for researching…
No I’ve no idea how to add write permission for a lxc guest on an host mount?

6

No idea right now how to do it in a proper manner, but you can shoot you in the knee through the eye via smb/cifs or nfs mount… :scream:

7

Turris TEAM: Please add support for this!

8

CONFIG_BTRFS_FS_POSIX_ACL is not set