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[PATCH] Block queue IO tracing support (blktrace) as of 2006-03-23

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Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jens Axboe 2006-03-23 20:00:26 +01:00
commit 2056a782f8
17 changed files with 916 additions and 3 deletions
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13
drivers/md/dm.c
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@ -17,6 +17,7 @@
#include <linux/mempool.h>
#include <linux/slab.h>
#include <linux/idr.h>
#include <linux/blktrace_api.h>
static const char *_name = DM_NAME;
@ -334,6 +335,8 @@ static void dec_pending(struct dm_io *io, int error)
/* nudge anyone waiting on suspend queue */
wake_up(&io->md->wait);
blk_add_trace_bio(io->md->queue, io->bio, BLK_TA_COMPLETE);
bio_endio(io->bio, io->bio->bi_size, io->error);
free_io(io->md, io);
}
@ -392,6 +395,7 @@ static void __map_bio(struct dm_target *ti, struct bio *clone,
struct target_io *tio)
{
int r;
sector_t sector;
/*
* Sanity checks.
@ -407,10 +411,17 @@ static void __map_bio(struct dm_target *ti, struct bio *clone,
* this io.
*/
atomic_inc(&tio->io->io_count);
sector = clone->bi_sector;
r = ti->type->map(ti, clone, &tio->info);
if (r > 0)
if (r > 0) {
/* the bio has been remapped so dispatch it */
blk_add_trace_remap(bdev_get_queue(clone->bi_bdev), clone,
tio->io->bio->bi_bdev->bd_dev, sector,
clone->bi_sector);
generic_make_request(clone);
}
else if (r < 0) {
/* error the io and bail out */