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Fix remap handling by blktrace

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This patch provides more information concerning REMAP operations on block
IOs. The additional information provides clearer details at the user level,
and supports post-processing analysis in btt.

o  Adds in partition remaps on the same device.
o  Fixed up the remap information in DM to be in the right order
o  Sent up mapped-from and mapped-to device information

Signed-off-by: Alan D. Brunelle <alan.brunelle@hp.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Alan D. Brunelle
2007-08-07 15:30:23 +02:00
committed by Jens Axboe
parent ec05b297f9
commit c7149d6bce
3 changed files with 8 additions and 3 deletions
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4
drivers/md/dm.c
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@@ -580,8 +580,8 @@ static void __map_bio(struct dm_target *ti, struct bio *clone,
/* 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);
tio->io->bio->bi_bdev->bd_dev,
clone->bi_sector, sector);
generic_make_request(clone);
} else if (r < 0 || r == DM_MAPIO_REQUEUE) {