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dm mpath: remove bio-based bloat from struct dm_mpath_io

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Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mike Snitzer 2016-05-24 15:48:08 -04:00
parent 76e33fe4e2
commit bf661be1fc
1 changed files with 32 additions and 13 deletions
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45
drivers/md/dm-mpath.c
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@ -109,11 +109,6 @@ struct multipath {
struct dm_mpath_io {
struct pgpath *pgpath;
size_t nr_bytes;
/*
* FIXME: make request-based code _not_ include this member.
*/
struct dm_bio_details bio_details;
};
typedef int (*action_fn) (struct pgpath *pgpath);
@ -294,19 +289,39 @@ static void clear_request_fn_mpio(struct multipath *m, union map_info *info)
}
}
static struct dm_mpath_io *get_mpio_from_bio(struct bio *bio)
static size_t multipath_per_bio_data_size(void)
{
return dm_per_bio_data(bio, sizeof(struct dm_mpath_io));
return sizeof(struct dm_mpath_io) + sizeof(struct dm_bio_details);
}
static struct dm_mpath_io *set_mpio_bio(struct multipath *m, struct bio *bio)
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)
{
/* 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_bio_details **bio_details_p)
{
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));
dm_bio_record(&mpio->bio_details, bio);
memset(bio_details, 0, sizeof(*bio_details));
dm_bio_record(bio_details, bio);
return mpio;
if (mpio_p)
*mpio_p = mpio;
if (bio_details_p)
*bio_details_p = bio_details;
}
/*-----------------------------------------------
@ -629,7 +644,9 @@ static int __multipath_map_bio(struct multipath *m, struct bio *bio, struct dm_m
static int multipath_map_bio(struct dm_target *ti, struct bio *bio)
{
struct multipath *m = ti->private;
struct dm_mpath_io *mpio = set_mpio_bio(m, bio);
struct dm_mpath_io *mpio = NULL;
multipath_init_per_bio_data(bio, &mpio, NULL);
return __multipath_map_bio(m, bio, mpio);
}
@ -1113,7 +1130,9 @@ static int __multipath_ctr(struct dm_target *ti, unsigned int argc,
ti->num_flush_bios = 1;
ti->num_discard_bios = 1;
ti->num_write_same_bios = 1;
if (use_blk_mq || bio_based)
if (bio_based)
ti->per_io_data_size = multipath_per_bio_data_size();
else if (use_blk_mq)
ti->per_io_data_size = sizeof(struct dm_mpath_io);
return 0;
@ -1576,7 +1595,7 @@ static int do_end_io_bio(struct multipath *m, struct bio *clone,
}
/* Queue for the daemon to resubmit */
dm_bio_restore(&mpio->bio_details, clone);
dm_bio_restore(get_bio_details_from_bio(clone), clone);
spin_lock_irqsave(&m->lock, flags);
bio_list_add(&m->queued_bios, clone);