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block: default the discard granularity to sector size

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Current the discard granularity defaults to 0 and must be initialized by
any driver that wants to support discard.  Default to the sector size
instead, which is the smallest possible value, and a very useful default.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20231228075545.362768-4-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2023-12-28 07:55:39 +00:00 committed by Jens Axboe
parent 5e7169e7f7
commit 3c407dc723
1 changed files with 4 additions and 1 deletions
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5
block/blk-settings.c
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@ -48,7 +48,7 @@ void blk_set_default_limits(struct queue_limits *lim)
lim->max_discard_sectors = 0; lim->max_discard_sectors = 0;
lim->max_hw_discard_sectors = 0; lim->max_hw_discard_sectors = 0;
lim->max_secure_erase_sectors = 0; lim->max_secure_erase_sectors = 0;
lim->discard_granularity = 0; lim->discard_granularity = 512;
lim->discard_alignment = 0; lim->discard_alignment = 0;
lim->discard_misaligned = 0; lim->discard_misaligned = 0;
lim->logical_block_size = lim->physical_block_size = lim->io_min = 512; lim->logical_block_size = lim->physical_block_size = lim->io_min = 512;
@ -309,6 +309,9 @@ void blk_queue_logical_block_size(struct request_queue *q, unsigned int size)
limits->logical_block_size = size; limits->logical_block_size = size;
if (limits->discard_granularity < limits->logical_block_size)
limits->discard_granularity = limits->logical_block_size;
if (limits->physical_block_size < size) if (limits->physical_block_size < size)
limits->physical_block_size = size; limits->physical_block_size = size;