From 5091cdec56faeaefa79de4b6cb3c3c55e50d1ac3 Mon Sep 17 00:00:00 2001 From: Mike Snitzer Date: Fri, 18 Sep 2020 20:22:30 -0400 Subject: [PATCH] dm: change max_io_len() to use blk_max_size_offset() Using blk_max_size_offset() enables DM core's splitting to impose ti->max_io_len (via q->limits.chunk_sectors) and also fallback to respecting q->limits.max_sectors if chunk_sectors isn't set. Signed-off-by: Mike Snitzer --- drivers/md/dm.c | 20 ++++++++------------ 1 file changed, 8 insertions(+), 12 deletions(-) diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 977a962fa0bb..82886b4edab8 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1051,22 +1051,18 @@ static sector_t max_io_len_target_boundary(sector_t sector, struct dm_target *ti static sector_t max_io_len(sector_t sector, struct dm_target *ti) { sector_t len = max_io_len_target_boundary(sector, ti); - sector_t offset, max_len; + sector_t max_len; /* * Does the target need to split even further? + * - q->limits.chunk_sectors reflects ti->max_io_len so + * blk_max_size_offset() provides required splitting. + * - blk_max_size_offset() also respects q->limits.max_sectors */ - if (ti->max_io_len) { - offset = dm_target_offset(ti, sector); - if (unlikely(ti->max_io_len & (ti->max_io_len - 1))) - max_len = sector_div(offset, ti->max_io_len); - else - max_len = offset & (ti->max_io_len - 1); - max_len = ti->max_io_len - max_len; - - if (len > max_len) - len = max_len; - } + max_len = blk_max_size_offset(dm_table_get_md(ti->table)->queue, + dm_target_offset(ti, sector)); + if (len > max_len) + len = max_len; return len; }