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block: sanitize chunk_sectors for atomic write limits 

Currently we just ensure that a non-zero value in chunk_sectors aligns
with any atomic write boundary, as the blk boundary functionality uses
both these values.

However it is also improper to have atomic write unit max > chunk_sectors
(for non-zero chunk_sectors), as this would lead to splitting of atomic
write bios (which is disallowed).

Sanitize atomic write unit max against chunk_sectors to avoid any
potential problems.

Fixes: d00eea91de ("block: Add extra checks in blk_validate_atomic_write_limits()")
Reviewed-by: Nilay Shroff <nilay@linux.ibm.com>
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/20250711105258.3135198-3-john.g.garry@oracle.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
John Garry 2025-07-11 10:52:54 +00:00 committed by Jens Axboe
parent 6381061d82
commit 1de67e8e28
1 changed files with 6 additions and 0 deletions
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6
block/blk-settings.c
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@ -181,6 +181,8 @@ static void blk_atomic_writes_update_limits(struct queue_limits *lim)
static void blk_validate_atomic_write_limits(struct queue_limits *lim)
{
unsigned int boundary_sectors;
unsigned int atomic_write_hw_max_sectors =
lim->atomic_write_hw_max >> SECTOR_SHIFT;
if (!(lim->features & BLK_FEAT_ATOMIC_WRITES))
goto unsupported;
@ -202,6 +204,10 @@ static void blk_validate_atomic_write_limits(struct queue_limits *lim)
lim->atomic_write_hw_max))
goto unsupported;
if (WARN_ON_ONCE(lim->chunk_sectors &&
atomic_write_hw_max_sectors > lim->chunk_sectors))
goto unsupported;
boundary_sectors = lim->atomic_write_hw_boundary >> SECTOR_SHIFT;
if (boundary_sectors) {