centos man page for blk_rq_err_bytes

BLK_RQ_ERR_BYTES(9)						   Block Devices					       BLK_RQ_ERR_BYTES(9)

NAME
       blk_rq_err_bytes - determine number of bytes till the next failure boundary

SYNOPSIS
       unsigned int blk_rq_err_bytes(const struct request * rq);

ARGUMENTS
       rq
	   request to examine

DESCRIPTION
       A request could be merge of IOs which require different failure handling. This function determines the number of bytes which can be failed
       from the beginning of the request without crossing into area which need to be retried further.

RETURN
       The number of bytes to fail.

CONTEXT
       queue_lock must be held.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						       BLK_RQ_ERR_BYTES(9)