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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>
This commit is contained in:
Mikulas Patocka 2023-09-18 17:33:29 +02:00 committed by Mike Snitzer
parent 3da5d2de92
commit f144503217
4 changed files with 13 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/md/dm-linear.c
View File

@ -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;

2
drivers/md/dm-stripe.c
View File

@ -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;

11
drivers/md/dm.c
View File

@ -1423,10 +1423,17 @@ 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:

2
drivers/md/dm.h
View File

@ -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);