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block: Add extra checks in blk_validate_atomic_write_limits()

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It is so far expected that the limits passed are valid.

In future atomic writes will be supported for stacked block devices, and
calculating the limits there will be complicated, so add extra sanity
checks to ensure that the values are always valid.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20241118105018.1870052-2-john.g.garry@oracle.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
John Garry 2024-11-18 10:50:14 +00:00 committed by Jens Axboe
parent 34c1227035
commit d00eea91de
1 changed files with 17 additions and 0 deletions
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17
block/blk-settings.c
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@ -178,9 +178,26 @@ static void blk_validate_atomic_write_limits(struct queue_limits *lim)
if (!lim->atomic_write_hw_max)
goto unsupported;
if (WARN_ON_ONCE(!is_power_of_2(lim->atomic_write_hw_unit_min)))
goto unsupported;
if (WARN_ON_ONCE(!is_power_of_2(lim->atomic_write_hw_unit_max)))
goto unsupported;
if (WARN_ON_ONCE(lim->atomic_write_hw_unit_min >
lim->atomic_write_hw_unit_max))
goto unsupported;
if (WARN_ON_ONCE(lim->atomic_write_hw_unit_max >
lim->atomic_write_hw_max))
goto unsupported;
boundary_sectors = lim->atomic_write_hw_boundary >> SECTOR_SHIFT;
if (boundary_sectors) {
if (WARN_ON_ONCE(lim->atomic_write_hw_max >
lim->atomic_write_hw_boundary))
goto unsupported;
/*
* A feature of boundary support is that it disallows bios to
* be merged which would result in a merged request which