[PATCH v2 2/2] block: Enforce power-of-2 physical block size
From: John Garry <john.g.garry@oracle.com>
Date: 2025-07-29 09:15:32
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
The merging/splitting code and other queue limits checking depends on the physical block size being a power-of-2, so enforce it. Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: John Garry <john.g.garry@oracle.com> --- block/blk-settings.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/block/blk-settings.c b/block/blk-settings.c
index fa53a330f9b99..5ae0a253e43fd 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c@@ -274,6 +274,10 @@ int blk_validate_limits(struct queue_limits *lim) } if (lim->physical_block_size < lim->logical_block_size) lim->physical_block_size = lim->logical_block_size; + else if (!is_power_of_2(lim->physical_block_size)) { + pr_warn("Invalid physical block size (%d)\n", lim->physical_block_size); + return -EINVAL; + } /* * The minimum I/O size defaults to the physical block size unless
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2.43.5