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
18           0 for success, < 0 for error
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20       nr_bytes
21           number of bytes to complete req
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DESCRIPTION

24       Ends I/O on a number of bytes attached to req, but doesn't complete the
25       request structure even if req doesn't have leftover. If req has
26       leftover, sets it up for the next range of segments.
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28       This special helper function is only for request stacking drivers (e.g.
29       request-based dm) so that they can handle partial completion. Actual
30       device drivers should use blk_end_request instead.
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32       Passing the result of blk_rq_bytes as nr_bytes guarantees false return
33       from this function.
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RETURN

36       false - this request doesn't have any more data true - this request has
37       more data
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40Kernel Hackers Manual 3.10         June 2019             BLK_UPDATE_REQUEST(9)
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