BLK_UPDATE_REQUEST(9) Block Devices BLK_UPDATE_REQUEST(9)NAMEblk_update_request - Special helper function for request stacking
bool blk_update_request(struct request * req, int error,
unsigned int nr_bytes);
the request being processed
0 for success, < 0 for error
number of bytes to complete req
Ends I/O on a number of bytes attached to req, but doesn't complete the
request structure even if req doesn't have leftover. If req has
leftover, sets it up for the next range of segments.
This special helper function is only for request stacking drivers (e.g.
request-based dm) so that they can handle partial completion. Actual
device drivers should use blk_end_request instead.
Passing the result of blk_rq_bytes as nr_bytes guarantees false return
from this function.
false - this request doesn't have any more data true - this request has
COPYRIGHTKernel Hackers Manual 3.8. June 2014 BLK_UPDATE_REQUEST(9)