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block: floor the discard granularity to the physical block size

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Discarding less than a physical block doesn't make sense.  This fixes
the existing behavior for zram before the recent changes to default
the discard granularity to the logical block size, and is also a
generally useful sanity check.

Fixes: 3753039def ("zram: use the default discard granularity")
Reported-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240103081622.508754-1-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2024-01-03 08:16:22 +00:00 committed by Jens Axboe
parent 31e4fac930
commit 458aa1a099
1 changed files with 3 additions and 0 deletions
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3
block/blk-settings.c
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@ -342,6 +342,9 @@ void blk_queue_physical_block_size(struct request_queue *q, unsigned int size)
if (q->limits.physical_block_size < q->limits.logical_block_size)
q->limits.physical_block_size = q->limits.logical_block_size;
if (q->limits.discard_granularity < q->limits.physical_block_size)
q->limits.discard_granularity = q->limits.physical_block_size;
if (q->limits.io_min < q->limits.physical_block_size)
q->limits.io_min = q->limits.physical_block_size;
}