From: Gabriel Krisman Bertazi <[email protected]>
[ Upstream commit 087615bf3acdafd0ba7c7c9ed5286e7b7c80fe1b ]
The HST path selector needs this information to perform path
prediction. For request-based mpath, struct request's io_start_time_ns
is used, while for bio-based, use the start_time stored in dm_io.
Signed-off-by: Gabriel Krisman Bertazi <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
---
drivers/md/dm-mpath.c | 9 ++++++---
drivers/md/dm-path-selector.h | 2 +-
drivers/md/dm-queue-length.c | 2 +-
drivers/md/dm-service-time.c | 2 +-
drivers/md/dm.c | 9 +++++++++
include/linux/device-mapper.h | 2 ++
6 files changed, 20 insertions(+), 6 deletions(-)
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index f2de4c73cc8fa..d7ebed50895f0 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -558,7 +558,8 @@ static void multipath_release_clone(struct request *clone,
if (pgpath && pgpath->pg->ps.type->end_io)
pgpath->pg->ps.type->end_io(&pgpath->pg->ps,
&pgpath->path,
- mpio->nr_bytes);
+ mpio->nr_bytes,
+ clone->io_start_time_ns);
}
blk_put_request(clone);
@@ -1560,7 +1561,8 @@ static int multipath_end_io(struct dm_target *ti, struct request *clone,
struct path_selector *ps = &pgpath->pg->ps;
if (ps->type->end_io)
- ps->type->end_io(ps, &pgpath->path, mpio->nr_bytes);
+ ps->type->end_io(ps, &pgpath->path, mpio->nr_bytes,
+ clone->io_start_time_ns);
}
return r;
@@ -1604,7 +1606,8 @@ static int multipath_end_io_bio(struct dm_target *ti, struct bio *clone,
struct path_selector *ps = &pgpath->pg->ps;
if (ps->type->end_io)
- ps->type->end_io(ps, &pgpath->path, mpio->nr_bytes);
+ ps->type->end_io(ps, &pgpath->path, mpio->nr_bytes,
+ dm_start_time_ns_from_clone(clone));
}
return r;
diff --git a/drivers/md/dm-path-selector.h b/drivers/md/dm-path-selector.h
index b6eb5365b1a46..c47bc0e20275b 100644
--- a/drivers/md/dm-path-selector.h
+++ b/drivers/md/dm-path-selector.h
@@ -74,7 +74,7 @@ struct path_selector_type {
int (*start_io) (struct path_selector *ps, struct dm_path *path,
size_t nr_bytes);
int (*end_io) (struct path_selector *ps, struct dm_path *path,
- size_t nr_bytes);
+ size_t nr_bytes, u64 start_time);
};
/* Register a path selector */
diff --git a/drivers/md/dm-queue-length.c b/drivers/md/dm-queue-length.c
index 969c4f1a36336..5fd018d184187 100644
--- a/drivers/md/dm-queue-length.c
+++ b/drivers/md/dm-queue-length.c
@@ -227,7 +227,7 @@ static int ql_start_io(struct path_selector *ps, struct dm_path *path,
}
static int ql_end_io(struct path_selector *ps, struct dm_path *path,
- size_t nr_bytes)
+ size_t nr_bytes, u64 start_time)
{
struct path_info *pi = path->pscontext;
diff --git a/drivers/md/dm-service-time.c b/drivers/md/dm-service-time.c
index f006a9005593b..9cfda665e9ebd 100644
--- a/drivers/md/dm-service-time.c
+++ b/drivers/md/dm-service-time.c
@@ -309,7 +309,7 @@ static int st_start_io(struct path_selector *ps, struct dm_path *path,
}
static int st_end_io(struct path_selector *ps, struct dm_path *path,
- size_t nr_bytes)
+ size_t nr_bytes, u64 start_time)
{
struct path_info *pi = path->pscontext;
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 3cf5b354568e5..1e7ad2ad48295 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -649,6 +649,15 @@ static bool md_in_flight(struct mapped_device *md)
return md_in_flight_bios(md);
}
+u64 dm_start_time_ns_from_clone(struct bio *bio)
+{
+ struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone);
+ struct dm_io *io = tio->io;
+
+ return jiffies_to_nsecs(io->start_time);
+}
+EXPORT_SYMBOL_GPL(dm_start_time_ns_from_clone);
+
static void start_io_acct(struct dm_io *io)
{
struct mapped_device *md = io->md;
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 399ad86323568..ec19222f67666 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -328,6 +328,8 @@ void *dm_per_bio_data(struct bio *bio, size_t data_size);
struct bio *dm_bio_from_per_bio_data(void *data, size_t data_size);
unsigned dm_bio_get_target_bio_nr(const struct bio *bio);
+u64 dm_start_time_ns_from_clone(struct bio *bio);
+
int dm_register_target(struct target_type *t);
void dm_unregister_target(struct target_type *t);
--
2.25.1
Greg Kroah-Hartman <[email protected]> writes:
> From: Gabriel Krisman Bertazi <[email protected]>
>
> [ Upstream commit 087615bf3acdafd0ba7c7c9ed5286e7b7c80fe1b ]
>
> The HST path selector needs this information to perform path
> prediction. For request-based mpath, struct request's io_start_time_ns
> is used, while for bio-based, use the start_time stored in dm_io.
Hi Greg,
This patch is not -stable material. It is only needed for a new feature
merged in 5.8.
Thanks,
--
Gabriel Krisman Bertazi