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| author |   Gabriel Krisman Bertazi <krisman@collabora.com> | 2020-04-30 16:48:29 -0400 |
|---|---|---|
| committer |   Mike Snitzer <snitzer@redhat.com> | 2020-05-15 10:29:36 -0400 |
| commit | 087615bf3acdafd0ba7c7c9ed5286e7b7c80fe1b (patch) | |
| tree | a3ecdcc75df1e1a714466302ebb9f4f29d58bfd9 /include/linux/device-mapper.h | |
| parent | dm writecache: improve performance on DDR persistent memory (Optane) (diff) | |
| download | wireguard-linux-087615bf3acdafd0ba7c7c9ed5286e7b7c80fe1b.tar.xz wireguard-linux-087615bf3acdafd0ba7c7c9ed5286e7b7c80fe1b.zip | |
dm mpath: pass IO start time to path selector
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 <krisman@collabora.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'include/linux/device-mapper.h')
| -rw-r--r-- | include/linux/device-mapper.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index af48d9da3916..934037d938b9 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -332,6 +332,8 @@ 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); |