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
       blk_qc_t 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 4.8.                 January 2017                   GENERIC_MAKE_REQUEST(9)