block: simplify set_init_blocksize

The loop to increase the initial block size doesn't really make any
sense, as the AND operation won't match for powers of two if it didn't
for the initial block size.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

fs/block_dev.c

@@ -106,13 +106,7 @@ EXPORT_SYMBOL(invalidate_bdev);
 static void set_init_blocksize(struct block_device *bdev)
 {
 	unsigned bsize = bdev_logical_block_size(bdev);
-	loff_t size = i_size_read(bdev->bd_inode);
 
-	while (bsize < PAGE_SIZE) {
-		if (size & bsize)
-			break;
-		bsize <<= 1;
-	}
 	bdev->bd_block_size = bsize;
 	bdev->bd_inode->i_blkbits = blksize_bits(bsize);
 }