block: decouple blk_set_stacking_limits from blk_set_default_limits

blk_set_stacking_limits uses very little from blk_set_default_limits.
Open code these initializations in preparation for rewriting
blk_set_default_limits.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20240213073425.1621680-4-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-settings.c b/block/blk-settings.c
index f16d3fec6658e5c1f70ae3c363111dba0eb40cd5..24042f6b33d54ec5f065564b1914332a2b6a3431 100644 (file)
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -65,13 +65,18 @@ void blk_set_default_limits(struct queue_limits *lim)
  * blk_set_stacking_limits - set default limits for stacking devices
  * @lim:  the queue_limits structure to reset
  *
- * Description:
- *   Returns a queue_limit struct to its default state. Should be used
- *   by stacking drivers like DM that have no internal limits.
+ * Prepare queue limits for applying limits from underlying devices using
+ * blk_stack_limits().
  */
 void blk_set_stacking_limits(struct queue_limits *lim)
 {
-       blk_set_default_limits(lim);
+       memset(lim, 0, sizeof(*lim));
+       lim->logical_block_size = SECTOR_SIZE;
+       lim->physical_block_size = SECTOR_SIZE;
+       lim->io_min = SECTOR_SIZE;
+       lim->discard_granularity = SECTOR_SIZE;
+       lim->dma_alignment = SECTOR_SIZE - 1;
+       lim->seg_boundary_mask = BLK_SEG_BOUNDARY_MASK;
 
        /* Inherit limits from component devices */
        lim->max_segments = USHRT_MAX;