linux-kernel - [PATCH V5 08/19] dax: export dax_dev

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Message-ID: <0100019bc83141c8-456ef04c-7071-4f4f-b513-17ea25c4e547-000000@email.amazonses.com>
Date: Fri, 16 Jan 2026 19:03:49 +0000
From: John Groves <john@...alactic.com>
To: John Groves <John@...ves.net>, 
	Miklos Szeredi <miklos@...redi.hu>, 
	Dan Williams <dan.j.williams@...el.com>, 
	Bernd Schubert <bschubert@....com>, 
	Alison Schofield <alison.schofield@...el.com>
Cc: John Groves <jgroves@...ron.com>, 
	John Groves <jgroves@...tmail.com>, 
	Jonathan Corbet <corbet@....net>, 
	Vishal Verma <vishal.l.verma@...el.com>, 
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Subject: [PATCH V5 08/19] dax: export dax_dev_get()

From: John Groves <john@...ves.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@...ves.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