Provided by: kernel-doc-2.4.27_2.4.27-12_all
void submit_bh (int rw, struct buffer_head *bh);
rw whether to READ or WRITE, or maybe to READA (read ahead)
bh The struct buffer_head which describes the I/O
submit_bh is very similar in purpose to generic_make_request, and uses
that function to do most of the work.
The extra functionality provided by submit_bh is to determine b_rsector
from b_blocknr and b_size, and to set b_rdev from b_dev. This is is
appropriate for IO requests that come from the buffer cache and page
cache which (currently) always use aligned blocks.