From: Daeho Jeong <daehojeong@xxxxxxxxxx>
After releasing cblocks, the compressed file can be accidentally
disabled in compression mode, since it has zero cblocks. As we are
using IMMUTABLE flag to present released cblocks state, we can add
IMMUTABLE state check when considering the compressed file disabling.
Signed-off-by: Daeho Jeong <daehojeong@xxxxxxxxxx>