1BLK_ADD_TRACE_RQ(9)              Block Devices             BLK_ADD_TRACE_RQ(9)
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NAME

6       blk_add_trace_rq - Add a trace for a request oriented action
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SYNOPSIS

9       void blk_add_trace_rq(struct request_queue * q, struct request * rq,
10                             unsigned int nr_bytes, u32 what);
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ARGUMENTS

13       q
14           queue the io is for
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16       rq
17           the source request
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19       nr_bytes
20           number of completed bytes
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22       what
23           the action
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DESCRIPTION

26       Records an action against a request. Will log the bio offset + size.
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29Kernel Hackers Manual 3.10         June 2019               BLK_ADD_TRACE_RQ(9)
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