[PATCH] Block queue IO tracing support (blktrace) as of 2006-03-23
Signed-off-by: Jens Axboe <axboe@suse.de>
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index e29b892..1f28909 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -38,6 +38,7 @@
#include <linux/hdreg.h>
#include <linux/spinlock.h>
#include <linux/compat.h>
+#include <linux/blktrace_api.h>
#include <asm/uaccess.h>
#include <asm/io.h>
@@ -2331,6 +2332,7 @@
cmd->rq->completion_data = cmd;
cmd->rq->errors = status;
+ blk_add_trace_rq(cmd->rq->q, cmd->rq, BLK_TA_COMPLETE);
blk_complete_request(cmd->rq);
}
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 */
