diff options
| author |   Jun'ichi Nomura <j-nomura@ce.jp.nec.com> | 2013-09-21 13:57:47 -0600 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2013-09-21 13:57:47 -0600 |
| commit | 75afb352991ff1cd3cf5955bfe611de6d83a0c87 (patch) | |
| tree | 2873c9fa5c098c4dd5134f395207af9463cc21d9 /include/linux/blkdev.h | |
| parent | If the queue is dying then we only call the rq->end_io callout. (diff) | |
| download | linux-dev-75afb352991ff1cd3cf5955bfe611de6d83a0c87.tar.xz linux-dev-75afb352991ff1cd3cf5955bfe611de6d83a0c87.zip | |
block: Add nr_bios to block_rq_remap tracepoint
Adding the number of bios in a remapped request to 'block_rq_remap'
tracepoint.
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:
http://www.redhat.com/archives/dm-devel/2013-August/msg00084.html
http://www.redhat.com/archives/dm-devel/2013-September/msg00024.html
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Acked-by: Mike Snitzer <snitzer@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/blkdev.h')
| -rw-r--r-- | include/linux/blkdev.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 2fdb4a451b49..0e6f765aa1f5 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -862,6 +862,17 @@ static inline unsigned int blk_rq_get_max_sectors(struct request *rq) return blk_queue_get_max_sectors(q, rq->cmd_flags); } +static inline unsigned int blk_rq_count_bios(struct request *rq) +{ + unsigned int nr_bios = 0; + struct bio *bio; + + __rq_for_each_bio(bio, rq) + nr_bios++; + + return nr_bios; +} + /* * Request issue related functions. */ |