[PATCH 03/14] rbd: increase io_opt again

[Christoph Hellwig <hch@xxxxxx>]

Commit 16d80c54ad42 ("rbd: set io_min, io_opt and discard_granularity to
alloc_size") lowered the io_opt size for rbd from objset_bytes which is
4MB for typical setup to alloc_size which is typically 64KB.

The commit mostly talks about discard behavior and does mention io_min
in passing.  Reducing io_opt means reducing the readahead size, which
seems counter-intuitive given that rbd currently abuses the user
max_sectors setting to actually increase the I/O size.  Switch back
to the old setting to allow larger reads (the readahead size despite it's
name actually limits the size of any buffered read) and to prepare
for using io_opt in the max_sectors calculation and getting drivers out
of the business of overriding the max_user_sectors value.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
 drivers/block/rbd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 26ff5cd2bf0abc..46dc487ccc17eb 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -4955,8 +4955,8 @@ static int rbd_init_disk(struct rbd_device *rbd_dev)
        struct queue_limits lim = {
                .max_hw_sectors         = objset_bytes >> SECTOR_SHIFT,
                .max_user_sectors       = objset_bytes >> SECTOR_SHIFT,
+               .io_opt                 = objset_bytes,
                .io_min                 = rbd_dev->opts->alloc_size,
-               .io_opt                 = rbd_dev->opts->alloc_size,
                .max_segments           = USHRT_MAX,
                .max_segment_size       = UINT_MAX,
        };
-- 
2.43.0