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dm: record old_sector in dm_target_io before calling map function

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Prep for being able to defer trace_block_bio_remap() until when the
bio is remapped and submitted by the DM target.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2022-02-17 23:40:23 -05:00
parent 77c11720a4
commit 743598f049
2 changed files with 5 additions and 3 deletions
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1
drivers/md/dm-core.h
View File

@ -216,6 +216,7 @@ struct dm_target_io {
unsigned int target_bio_nr;
unsigned int *len_ptr;
bool inside_dm_io;
sector_t old_sector;
struct bio clone;
};

7
drivers/md/dm.c
View File

@ -584,6 +584,7 @@ static struct bio *alloc_tio(struct clone_info *ci, struct dm_target *ti,
tio->ti = ti;
tio->target_bio_nr = target_bio_nr;
tio->len_ptr = len;
tio->old_sector = 0;
return &tio->clone;
}
@ -1139,7 +1140,6 @@ static void __map_bio(struct bio *clone)
{
struct dm_target_io *tio = clone_to_tio(clone);
int r;
sector_t sector;
struct dm_io *io = tio->io;
struct dm_target *ti = tio->ti;
@ -1151,7 +1151,7 @@ static void __map_bio(struct bio *clone)
* this io.
*/
dm_io_inc_pending(io);
sector = clone->bi_iter.bi_sector;
tio->old_sector = clone->bi_iter.bi_sector;
if (unlikely(swap_bios_limit(ti, clone))) {
struct mapped_device *md = io->md;
@ -1176,7 +1176,8 @@ static void __map_bio(struct bio *clone)
break;
case DM_MAPIO_REMAPPED:
/* the bio has been remapped so dispatch it */
trace_block_bio_remap(clone, bio_dev(io->orig_bio), sector);
trace_block_bio_remap(clone, bio_dev(io->orig_bio),
tio->old_sector);
submit_bio_noacct(clone);
break;
case DM_MAPIO_KILL: