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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
block/ll_rw_blk.c
View file

@ -3047,6 +3047,10 @@ static inline void blk_partition_remap(struct bio *bio)
bio->bi_sector += p->start_sect; bio->bi_sector += p->start_sect;
bio->bi_bdev = bdev->bd_contains; bio->bi_bdev = bdev->bd_contains;
blk_add_trace_remap(bdev_get_queue(bio->bi_bdev), bio,
bdev->bd_dev, bio->bi_sector,
bio->bi_sector - p->start_sect);
} }
} }

4
drivers/md/dm.c
View file

@ -580,8 +580,8 @@ static void __map_bio(struct dm_target *ti, struct bio *clone,
/* the bio has been remapped so dispatch it */ /* the bio has been remapped so dispatch it */
blk_add_trace_remap(bdev_get_queue(clone->bi_bdev), clone, blk_add_trace_remap(bdev_get_queue(clone->bi_bdev), clone,
tio->io->bio->bi_bdev->bd_dev, sector, tio->io->bio->bi_bdev->bd_dev,
clone->bi_sector); clone->bi_sector, sector);
generic_make_request(clone); generic_make_request(clone);
} else if (r < 0 || r == DM_MAPIO_REQUEUE) { } else if (r < 0 || r == DM_MAPIO_REQUEUE) {

3
include/linux/blktrace_api.h
View file

@ -105,7 +105,7 @@ struct blk_io_trace {
*/ */
struct blk_io_trace_remap { struct blk_io_trace_remap {
__be32 device; __be32 device;
u32 __pad; __be32 device_from;
__be64 sector; __be64 sector;
}; };
@ -272,6 +272,7 @@ static inline void blk_add_trace_remap(struct request_queue *q, struct bio *bio,
return; return;
r.device = cpu_to_be32(dev); r.device = cpu_to_be32(dev);
r.device_from = cpu_to_be32(bio->bi_bdev->bd_dev);
r.sector = cpu_to_be64(to); r.sector = cpu_to_be64(to);
__blk_add_trace(bt, from, bio->bi_size, bio->bi_rw, BLK_TA_REMAP, !bio_flagged(bio, BIO_UPTODATE), sizeof(r), &r); __blk_add_trace(bt, from, bio->bi_size, bio->bi_rw, BLK_TA_REMAP, !bio_flagged(bio, BIO_UPTODATE), sizeof(r), &r);