diff options
| author | Mikulas Patocka <mpatocka@redhat.com> | 2023-09-18 18:33:29 +0300 |
|---|---|---|
| committer | Mike Snitzer <snitzer@kernel.org> | 2023-10-07 02:09:25 +0300 |
| commit | f1445032173d4a49eb8b4a0808db499966897d9a (patch) | |
| tree | a6d1d00afab88cece6d22d4caf63c06b08227689 /drivers/md | |
| parent | 3da5d2de92387a8322965c7fb1365f7cae690e5a (diff) | |
| download | linux-f1445032173d4a49eb8b4a0808db499966897d9a.tar.xz | |
dm: shortcut the calls to linear_map and stripe_map
Shortcut the calls to linear_map and stripe_map, so that they don't suffer
the overhead of retpolines used for indirect calls.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/dm-linear.c | 2 | ||||
| -rw-r--r-- | drivers/md/dm-stripe.c | 2 | ||||
| -rw-r--r-- | drivers/md/dm.c | 11 | ||||
| -rw-r--r-- | drivers/md/dm.h | 2 |
4 files changed, 13 insertions, 4 deletions
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c index f4448d520ee9..2d3e186ca87e 100644 --- a/drivers/md/dm-linear.c +++ b/drivers/md/dm-linear.c @@ -85,7 +85,7 @@ static sector_t linear_map_sector(struct dm_target *ti, sector_t bi_sector) return lc->start + dm_target_offset(ti, bi_sector); } -static int linear_map(struct dm_target *ti, struct bio *bio) +int linear_map(struct dm_target *ti, struct bio *bio) { struct linear_c *lc = ti->private; diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c index e2854a3cbd28..c11619d82a7e 100644 --- a/drivers/md/dm-stripe.c +++ b/drivers/md/dm-stripe.c @@ -268,7 +268,7 @@ static int stripe_map_range(struct stripe_c *sc, struct bio *bio, return DM_MAPIO_SUBMITTED; } -static int stripe_map(struct dm_target *ti, struct bio *bio) +int stripe_map(struct dm_target *ti, struct bio *bio) { struct stripe_c *sc = ti->private; uint32_t stripe; diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 64a1f306c96c..ab7dd8ab51d1 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1424,9 +1424,16 @@ static void __map_bio(struct bio *clone) if (unlikely(dm_emulate_zone_append(md))) r = dm_zone_map_bio(tio); else + goto do_map; + } else { +do_map: + if (likely(ti->type->map == linear_map)) + r = linear_map(ti, clone); + else if (ti->type->map == stripe_map) + r = stripe_map(ti, clone); + else r = ti->type->map(ti, clone); - } else - r = ti->type->map(ti, clone); + } switch (r) { case DM_MAPIO_SUBMITTED: diff --git a/drivers/md/dm.h b/drivers/md/dm.h index f682295af91f..7f1acbf6bd9e 100644 --- a/drivers/md/dm.h +++ b/drivers/md/dm.h @@ -188,9 +188,11 @@ void dm_kobject_release(struct kobject *kobj); /* * Targets for linear and striped mappings */ +int linear_map(struct dm_target *ti, struct bio *bio); int dm_linear_init(void); void dm_linear_exit(void); +int stripe_map(struct dm_target *ti, struct bio *bio); int dm_stripe_init(void); void dm_stripe_exit(void); |