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block: trace bio queueing trial only when it occurs

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If BIO is discarded or cross over end of device,
BIO queueing trial doesn't occur.

Actually the trace was called just before make_request at first:
[PATCH] Block queue IO tracing support (blktrace) as of 2006-03-23
      2056a782f8

And then 2 patches added some checks between them:
[PATCH] md: check bio address after mapping through partitions
        5ddfe9691c,
[BLOCK] Don't allow empty barriers to be passed down to
queues that don't grok them
        51fd77bd9f

It breaks original goal.
Let's trace it only when it happens.

Signed-off-by: Minchan Kim <minchan.kim@gmail.com>
Acked-by: Wu Fengguang <fengguang.wu@intel.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Minchan Kim 2009-09-08 21:56:38 +02:00 • committed by Jens Axboe
commit 01edede41e
1 changed files with 2 additions and 2 deletions
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4
block/blk-core.c
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@ -1462,8 +1462,6 @@ static inline void __generic_make_request(struct bio *bio)
if (old_sector != -1)
trace_block_remap(q, bio, old_dev, old_sector);
trace_block_bio_queue(q, bio);
old_sector = bio->bi_sector;
old_dev = bio->bi_bdev->bd_dev;
@ -1476,6 +1474,8 @@ static inline void __generic_make_request(struct bio *bio)
goto end_io;
}
trace_block_bio_queue(q, bio);
ret = q->make_request_fn(q, bio);
} while (ret);