block/bdev: use helper for max block size check

We already have a helper for checking the limits on the block size
both low and high, just use that.

No functional changes.

Reviewed-by: John Garry <john.g.garry@oracle.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20241218020212.3657139-2-mcgrof@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: mcgrof

block/bdev.c

@@ -155,8 +155,7 @@ int set_blocksize(struct file *file, int size)
 	struct inode *inode = file->f_mapping->host;
 	struct block_device *bdev = I_BDEV(inode);
 
-	/* Size must be a power of two, and between 512 and PAGE_SIZE */
-	if (size > PAGE_SIZE || size < 512 || !is_power_of_2(size))
+	if (blk_validate_block_size(size))
 		return -EINVAL;
 
 	/* Size cannot be smaller than the size supported by the device */