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

John Groves
2026-01-18T22:32:23Z

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>
---
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);
--
2.52.0