Re: [PATCH V7 08/19] dax: export dax_dev_get()

Dave Jiang
2026-02-19T16:18:43Z

On 1/18/26 3:32 PM, John Groves wrote:
> From: John Groves <john@groves.net>
>
> famfs needs to look up a dax_device by dev_t when resolving fmap
> entries that reference character dax devices.
>
> Signed-off-by: John Groves <john@groves.net>

Reviewed-by: Dave Jiang <dave.jiang@intel.com>

It's tiny enough that maybe you can just squash it with the commit that you are using it?

> ---
> drivers/dax/super.c | 3 ++-
> include/linux/dax.h | 1 +
> 2 files changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/dax/super.c b/drivers/dax/super.c
> index 00c330ef437c..d097561d78db 100644
> --- a/drivers/dax/super.c
> +++ b/drivers/dax/super.c
> @@ -513,7 +513,7 @@ static int dax_set(struct inode *inode, void *data)
> return 0;
> }
>
> -static struct dax_device *dax_dev_get(dev_t devt)
> +struct dax_device *dax_dev_get(dev_t devt)
> {
> struct dax_device *dax_dev;
> struct inode *inode;
> @@ -536,6 +536,7 @@ static struct dax_device *dax_dev_get(dev_t devt)
>
> return dax_dev;
> }
> +EXPORT_SYMBOL_GPL(dax_dev_get);
>
> struct dax_device *alloc_dax(void *private, const struct dax_operations *ops)
> {
> diff --git a/include/linux/dax.h b/include/linux/dax.h
> index 6897c5736543..1ef9b03f9671 100644
> --- a/include/linux/dax.h
> +++ b/include/linux/dax.h
> @@ -55,6 +55,7 @@ struct dax_device *alloc_dax(void *private, const struct dax_operations *ops);
> void *dax_holder(struct dax_device *dax_dev);
> void put_dax(struct dax_device *dax_dev);
> void kill_dax(struct dax_device *dax_dev);
> +struct dax_device *dax_dev_get(dev_t devt);
> void dax_write_cache(struct dax_device *dax_dev, bool wc);
> bool dax_write_cache_enabled(struct dax_device *dax_dev);
> bool dax_synchronous(struct dax_device *dax_dev);