[RFC PATCH] fs/hugetlb: Fix UBSAN warning reported on hugetlb

[Matthew Wilcox]

On Thu, Sep 08, 2022 at 12:56:59PM +0530, Aneesh Kumar K.V wrote:
> +++ b/fs/dax.c
> @@ -1304,7 +1304,7 @@ EXPORT_SYMBOL_GPL(dax_zero_range);
>  int dax_truncate_page(struct inode *inode, loff_t pos, bool *did_zero,
>  		const struct iomap_ops *ops)
>  {
> -	unsigned int blocksize = i_blocksize(inode);
> +	size_t blocksize = i_blocksize(inode);
>  	unsigned int off = pos & (blocksize - 1);

If blocksize is larger than 4GB, then off also needs to be size_t.

> +++ b/fs/iomap/buffered-io.c
> @@ -955,7 +955,7 @@ int
>  iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero,
>  		const struct iomap_ops *ops)
>  {
> -	unsigned int blocksize = i_blocksize(inode);
> +	size_t blocksize = i_blocksize(inode);
>  	unsigned int off = pos & (blocksize - 1);

Ditto.

(maybe there are others; I didn't check closely)