BLK_UPDATE_REQUEST - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Block Devices

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NAMEblk_update_request − Special helper function for request stacking drivers

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SYNOPSISbool blk_update_request(struct request * req, int error, unsigned int nr_bytes);

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ARGUMENTSreq the request being processed error 0 for success, < 0 for error nr_bytes number of bytes to complete req

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DESCRIPTIONEnds 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​.

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RETURNfalse − this request doesn´t have any more data true − this request has more data

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