I am in a chicken-egg situation for my secondary harddrive (non boot):
- My BTRFS mount has gone readonly because no space left.
btrfs filesystem resizeonly works on mounted volumes.
- I needed to umount this ro mount in force mode (because of device busy).
- If I try to mount rw it fails because of errors (most likely caused by no space left)
- If I try to run
btrfs check --repairit gives device busy
What to do to find out what keeps
/dev/sda busy? My hdd is listed in
/etc/fstab, does that matter (
UUID=262a8d86-279a-4f6b-8968-32e200c32255 /mnt/hdd btrfs defaults,compress=zlib 0 1)???
lsof | grep /dev/s-> nothing
lsof | grep /mnt/hdd-> nothing
- The same for
mount -o recovery /dev/sda /mnt/hdd
[63035.539792] BTRFS error (device sda): Remounting read-write after error is not allowed
If I try to run:
root@myhost:/mnt# btrfs check --repair /dev/sda enabling repair mode ERROR: cannot open device '/dev/sda': Device or resource busy ERROR: cannot open file system