I have a small server with a samba share that sometimes I use to share removable disks connected in the hot swap bays.
After mounting a disk and accessing it, I try to unmount it, but umount refuses (even using -f) to do it because the disk is busy: umount: /share/external: target is busy..
lsof reports:
smbd 62850 root cwd DIR 8,65 4096 1 /share/external
smbd 62850 root 46r DIR 8,65 4096 1 /share/external
smbd 62851 alessandro cwd DIR 8,65 4096 1 /share/external
smbstatus shows the mountpoint is locked (I already closed the file manager):
Locked files:
Pid User(ID) DenyMode Access R/W Oplock SharePath Name Time
--------------------------------------------------------------------------------------------------
62850 1000 DENY_NONE 0x81 RDONLY NONE /share/external . Mon Mar 14 17:09:58 2022
So, to unmount the drive I have to restart smbd first and then I can run umount successfully, but I want to avoid restarting the service, or killing processes manually (as I saw searching online). I also tried to disable possible locks in smb.conf with
locking = No
oplocks = No
but without success.
Does someone know how to stop this behavior and allow unmounting without restarting?
Useful information:
- Ubuntu 20.04.4 LTS (GNU/Linux 5.4.0-104-generic x86_64)
- Samba version 4.13.17-Ubuntu
