[PATCH] Block queue IO tracing support (blktrace) as of 2006-03-23
Signed-off-by: Jens Axboe <axboe@suse.de>
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 26b08ee..8c82373 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -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 @@
/* 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 @@
struct target_io *tio)
{
int r;
+ sector_t sector;
/*
* Sanity checks.
@@ -407,10 +411,17 @@
* 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 */