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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>
This commit is contained in:
Christoph Hellwig 2024-02-13 08:34:13 +01:00 committed by Jens Axboe
parent b9947297d0
commit c490f226a0
1 changed files with 9 additions and 4 deletions
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13
block/blk-settings.c
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@ -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;