centos man page for generic_make_request

GENERIC_MAKE_REQUEST(9) 					   Block Devices					   GENERIC_MAKE_REQUEST(9)

NAME
       generic_make_request - hand a buffer to its device driver for I/O

SYNOPSIS
       void generic_make_request(struct bio * bio);

ARGUMENTS
       bio
	   The bio describing the location in memory and on the device.

DESCRIPTION
       generic_make_request is used to make I/O requests of block devices. It is passed a struct bio, which describes the I/O that needs to be
       done.

       generic_make_request does not return any status. The success/failure status of the request, along with notification of completion, is
       delivered asynchronously through the bio->bi_end_io function described (one day) else where.

       The caller of generic_make_request must make sure that bi_io_vec are set to describe the memory buffer, and that bi_dev and bi_sector are
       set to describe the device address, and the bi_end_io and optionally bi_private are set to describe how completion notification should be
       signaled.

       generic_make_request and the drivers it calls may use bi_next if this bio happens to be merged with someone else, and may resubmit the bio
       to a lower device by calling into generic_make_request recursively, which means the bio should NOT be touched after the call to
       ->make_request_fn.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   GENERIC_MAKE_REQUEST(9)