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dm: stop using bi_private 

Device mapper uses the bio structure's bi_private field as a pointer
to dm_target_io or dm_rq_clone_bio_info.  But a bio structure is
embedded in the dm_target_io and dm_rq_clone_bio_info structures, so the
pointer to the structure that contains the bio can be found with the
container_of() macro.

Remove the use of bi_private and use container_of() instead.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mikulas Patocka 2014-03-04 18:24:49 -05:00 committed by Mike Snitzer
parent d70ab4fb72
commit bfc6d41cee
1 changed files with 3 additions and 4 deletions
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7
drivers/md/dm.c
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@ -753,7 +753,7 @@ static void dec_pending(struct dm_io *io, int error)
static void clone_endio(struct bio *bio, int error)
{
int r = 0;
struct dm_target_io *tio = bio->bi_private;
struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone);
struct dm_io *io = tio->io;
struct mapped_device *md = tio->io->md;
dm_endio_fn endio = tio->ti->type->end_io;
@ -787,7 +787,8 @@ static void clone_endio(struct bio *bio, int error)
*/
static void end_clone_bio(struct bio *clone, int error)
{
struct dm_rq_clone_bio_info *info = clone->bi_private;
struct dm_rq_clone_bio_info *info =
container_of(clone, struct dm_rq_clone_bio_info, clone);
struct dm_rq_target_io *tio = info->tio;
struct bio *bio = info->orig;
unsigned int nr_bytes = info->orig->bi_iter.bi_size;
@ -1113,7 +1114,6 @@ static void __map_bio(struct dm_target_io *tio)
struct dm_target *ti = tio->ti;
clone->bi_end_io = clone_endio;
clone->bi_private = tio;
/*
* Map the clone. If r == 0 we don't need to do
@ -1522,7 +1522,6 @@ static int dm_rq_bio_constructor(struct bio *bio, struct bio *bio_orig,
info->orig = bio_orig;
info->tio = tio;
bio->bi_end_io = end_clone_bio;
bio->bi_private = info;
return 0;
}