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block: check for max_hw_sectors underflow 

The logical block size need to be smaller than the max_hw_sector
setting, otherwise we can't even transfer a single LBA.

Signed-off-by: Hannes Reinecke <hare@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: John Garry <john.g.garry@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Hannes Reinecke 2024-05-24 12:46:51 +02:00 committed by Jens Axboe
parent e528bede6f
commit e993db2d6e
1 changed files with 6 additions and 2 deletions
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8
block/blk-settings.c
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@ -104,6 +104,7 @@ static int blk_validate_zoned_limits(struct queue_limits *lim)
static int blk_validate_limits(struct queue_limits *lim)
{
unsigned int max_hw_sectors;
unsigned int logical_block_sectors;
/*
* Unless otherwise specified, default to 512 byte logical blocks and a
@ -134,8 +135,11 @@ static int blk_validate_limits(struct queue_limits *lim)
lim->max_hw_sectors = BLK_SAFE_MAX_SECTORS;
if (WARN_ON_ONCE(lim->max_hw_sectors < PAGE_SECTORS))
return -EINVAL;
logical_block_sectors = lim->logical_block_size >> SECTOR_SHIFT;
if (WARN_ON_ONCE(logical_block_sectors > lim->max_hw_sectors))
return -EINVAL;
lim->max_hw_sectors = round_down(lim->max_hw_sectors,
lim->logical_block_size >> SECTOR_SHIFT);
logical_block_sectors);
/*
* The actual max_sectors value is a complex beast and also takes the
@ -153,7 +157,7 @@ static int blk_validate_limits(struct queue_limits *lim)
lim->max_sectors = min(max_hw_sectors, BLK_DEF_MAX_SECTORS_CAP);
}
lim->max_sectors = round_down(lim->max_sectors,
lim->logical_block_size >> SECTOR_SHIFT);
logical_block_sectors);
/*
* Random default for the maximum number of segments. Driver should not