1BLK_UPDATE_REQUEST(9)            Block Devices           BLK_UPDATE_REQUEST(9)
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NAME

6       blk_update_request - Special helper function for request stacking
7       drivers
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SYNOPSIS

10       bool blk_update_request(struct request * req, int error,
11                               unsigned int nr_bytes);
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ARGUMENTS

14       req
15           the request being processed
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17       error
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19           0 for success, < 0 for error
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21       nr_bytes
22           number of bytes to complete req
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DESCRIPTION

25       Ends I/O on a number of bytes attached to req, but doesn´t complete the
26       request structure even if req doesn´t have leftover. If req has
27       leftover, sets it up for the next range of segments.
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29       This special helper function is only for request stacking drivers (e.g.
30       request-based dm) so that they can handle partial completion. Actual
31       device drivers should use blk_end_request instead.
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33       Passing the result of blk_rq_bytes as nr_bytes guarantees false return
34       from this function.
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RETURN

37       false - this request doesn´t have any more data true - this request has
38       more data
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41Kernel Hackers Manual 2.6.         June 2019             BLK_UPDATE_REQUEST(9)
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