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block: add @req to bio_{front|back}_merge tracepoints

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bio_{front|back}_merge tracepoints report a bio merging into an
existing request but didn't specify which request the bio is being
merged into.  Add @req to it.  This makes it impossible to share the
event template with block_bio_queue - split it out.

@req isn't used or exported to userland at this point and there is no
userland visible behavior change.  Later changes will make use of the
extra parameter.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo
2013-01-11 13:06:34 -08:00
committed by Jens Axboe
parent 3a366e614d
commit 8c1cf6bb02
3 changed files with 38 additions and 13 deletions
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2
kernel/trace/blktrace.c
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@@ -803,6 +803,7 @@ static void blk_add_trace_bio_complete(void *ignore, struct bio *bio, int error)
static void blk_add_trace_bio_backmerge(void *ignore,
struct request_queue *q,
struct request *rq,
struct bio *bio)
{
blk_add_trace_bio(q, bio, BLK_TA_BACKMERGE, 0);
@@ -810,6 +811,7 @@ static void blk_add_trace_bio_backmerge(void *ignore,
static void blk_add_trace_bio_frontmerge(void *ignore,
struct request_queue *q,
struct request *rq,
struct bio *bio)
{
blk_add_trace_bio(q, bio, BLK_TA_FRONTMERGE, 0);