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dm mpath: remove unnecessary memset() calls for per-io-data 

All underlying members are initialized directly so the memset() calls
are not needed.  Also, initialize mpio->nr_bytes from the start since it
never changes.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2017-12-11 15:58:41 -05:00
parent 63f6e6fd05
commit d0442f8039
1 changed files with 6 additions and 10 deletions
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16
drivers/md/dm-mpath.c
View File

@ -278,12 +278,11 @@ static void multipath_init_per_bio_data(struct bio *bio, struct dm_mpath_io **mp
struct dm_mpath_io *mpio = get_mpio_from_bio(bio);
struct dm_bio_details *bio_details = get_bio_details_from_bio(bio);
memset(mpio, 0, sizeof(*mpio));
memset(bio_details, 0, sizeof(*bio_details));
dm_bio_record(bio_details, bio);
mpio->nr_bytes = bio->bi_iter.bi_size;
mpio->pgpath = NULL;
*mpio_p = mpio;
if (mpio_p)
*mpio_p = mpio;
dm_bio_record(bio_details, bio);
}
/*-----------------------------------------------
@ -518,7 +517,6 @@ static int multipath_clone_and_map(struct dm_target *ti, struct request *rq,
return DM_MAPIO_REQUEUE;
}
memset(mpio, 0, sizeof(*mpio));
mpio->pgpath = pgpath;
mpio->nr_bytes = nr_bytes;
@ -556,7 +554,6 @@ static void multipath_release_clone(struct request *clone)
*/
static int __multipath_map_bio(struct multipath *m, struct bio *bio, struct dm_mpath_io *mpio)
{
size_t nr_bytes = bio->bi_iter.bi_size;
struct pgpath *pgpath;
unsigned long flags;
bool queue_io;
@ -565,7 +562,7 @@ static int __multipath_map_bio(struct multipath *m, struct bio *bio, struct dm_m
pgpath = READ_ONCE(m->current_pgpath);
queue_io = test_bit(MPATHF_QUEUE_IO, &m->flags);
if (!pgpath || !queue_io)
pgpath = choose_pgpath(m, nr_bytes);
pgpath = choose_pgpath(m, mpio->nr_bytes);
if ((pgpath && queue_io) ||
(!pgpath && test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags))) {
@ -589,7 +586,6 @@ static int __multipath_map_bio(struct multipath *m, struct bio *bio, struct dm_m
}
mpio->pgpath = pgpath;
mpio->nr_bytes = nr_bytes;
bio->bi_status = 0;
bio_set_dev(bio, pgpath->path.dev->bdev);
@ -598,7 +594,7 @@ static int __multipath_map_bio(struct multipath *m, struct bio *bio, struct dm_m
if (pgpath->pg->ps.type->start_io)
pgpath->pg->ps.type->start_io(&pgpath->pg->ps,
&pgpath->path,
nr_bytes);
mpio->nr_bytes);
return DM_MAPIO_REMAPPED;
}