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¶