pblk allocates line bitmaps within the line lock unnecessarily. In order to take pressure out of the fast patch, allocate line bitmaps outside of this lock and refactor accordingly. Signed-off-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>