From 06961c487a33a222fd3d84998dc6398ed0449373 Mon Sep 17 00:00:00 2001 From: Mike Snitzer Date: Wed, 1 Mar 2023 12:48:43 -0500 Subject: dm: split discards further if target sets max_discard_granularity The block core (bio_split_discard) will already split discards based on the 'discard_granularity' and 'max_discard_sectors' queue_limits. But the DM thin target also needs to ensure that it doesn't receive a discard that spans a 'max_discard_sectors' boundary. Introduce a dm_target 'max_discard_granularity' flag that if set will cause DM core to split discard bios relative to 'max_discard_sectors'. This treats 'discard_granularity' as a "min_discard_granularity" and 'max_discard_sectors' as a "max_discard_granularity". Requested-by: Joe Thornber Signed-off-by: Mike Snitzer --- include/linux/device-mapper.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'include/linux/device-mapper.h') diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index 7975483816e4..8aa6b3ea91fa 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -358,6 +358,12 @@ struct dm_target { */ bool discards_supported:1; + /* + * Set if this target requires that discards be split on both + * 'discard_granularity' and 'max_discard_sectors' boundaries. + */ + bool max_discard_granularity:1; + /* * Set if we need to limit the number of in-flight bios when swapping. */ -- cgit v1.2.3