Arnd Bergmann <arnd@xxxxxxxxxx> writes:
> From: Arnd Bergmann <arnd@xxxxxxxx>
>
> When block device support is disabled, DAX fails to link with:
>
> aarch64-linux/bin/aarch64-linux-ld: fs/dax.o: in function `dax_file_unshare':
> dax.c:(.text+0x2694): undefined reference to `iomap_want_unshare_iter'
>
> Return false in this case, as far as I can tell, this cannot happen
> without block devices.
>
> Fixes: 6ef6a0e821d3 ("iomap: share iomap_unshare_iter predicate code with fsdax")
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Looks like a fix was submitted already for this [1]
[1]: https://lore.kernel.org/all/20241015041350.118403-1-hch@xxxxxx/
-ritesh
> ---
> include/linux/iomap.h | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/include/linux/iomap.h b/include/linux/iomap.h
> index e04c060e8fe1..84ec2b7419c5 100644
> --- a/include/linux/iomap.h
> +++ b/include/linux/iomap.h
> @@ -281,7 +281,14 @@ void iomap_invalidate_folio(struct folio *folio, size_t offset, size_t len);
> bool iomap_dirty_folio(struct address_space *mapping, struct folio *folio);
> int iomap_file_unshare(struct inode *inode, loff_t pos, loff_t len,
> const struct iomap_ops *ops);
> +#ifdef CONFIG_BLOCK
> bool iomap_want_unshare_iter(const struct iomap_iter *iter);
> +#else
> +static inline bool iomap_want_unshare_iter(const struct iomap_iter *iter)
> +{
> + return false;
> +}
> +#endif
> int iomap_zero_range(struct inode *inode, loff_t pos, loff_t len,
> bool *did_zero, const struct iomap_ops *ops);
> int iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero,
> --
> 2.39.5
