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dm mpath: optimize retrieval of bio_details from per-bio-data

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Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2017-12-11 16:08:54 -05:00
parent d0442f8039
commit d07a241d4f
1 changed files with 3 additions and 5 deletions
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8
drivers/md/dm-mpath.c
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@ -264,19 +264,17 @@ static struct dm_mpath_io *get_mpio_from_bio(struct bio *bio)
return dm_per_bio_data(bio, multipath_per_bio_data_size());
}
static struct dm_bio_details *get_bio_details_from_bio(struct bio *bio)
static struct dm_bio_details *get_bio_details_from_mpio(struct dm_mpath_io *mpio)
{
/* dm_bio_details is immediately after the dm_mpath_io in bio's per-bio-data */
struct dm_mpath_io *mpio = get_mpio_from_bio(bio);
void *bio_details = mpio + 1;
return bio_details;
}
static void multipath_init_per_bio_data(struct bio *bio, struct dm_mpath_io **mpio_p)
{
struct dm_mpath_io *mpio = get_mpio_from_bio(bio);
struct dm_bio_details *bio_details = get_bio_details_from_bio(bio);
struct dm_bio_details *bio_details = get_bio_details_from_mpio(mpio);
mpio->nr_bytes = bio->bi_iter.bi_size;
mpio->pgpath = NULL;
@ -1554,7 +1552,7 @@ static int multipath_end_io_bio(struct dm_target *ti, struct bio *clone,
}
/* Queue for the daemon to resubmit */
dm_bio_restore(get_bio_details_from_bio(clone), clone);
dm_bio_restore(get_bio_details_from_mpio(mpio), clone);
spin_lock_irqsave(&m->lock, flags);
bio_list_add(&m->queued_bios, clone);