block: Add nr_bios to block_rq_remap tracepoint

Adding the number of bios in a remapped request to 'block_rq_remap'

Request remapper clones bios in a request to track the completion
status of each bio. So the number of bios can be useful information
for investigation.

Related discussions:

Signed-off-by: Jun'ichi Nomura <>
Acked-by: Mike Snitzer <>
Cc: Jens Axboe <>
Signed-off-by: Jens Axboe <>
2 files changed