The fact that the +C attribute excludes compression is mentioned in
<https://btrfs.readthedocs.io/en/latest/ch-compression.html#compatibility>.
Also mention it at the swapfile for clarity.
Pull-request: #530
Author: Nikolaos Chatzikonstantinou <nchatz314@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
swapon fails with an unclear error message, add some hints were to look
for more information.
Author: Torstein Eide
Pull-request: #491
Signed-off-by: David Sterba <dsterba@suse.com>
