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.       November 2011           BLK_UPDATE_REQUEST(9)
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