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Date:   Mon, 23 Aug 2021 14:35:13 +0200
From:   Christoph Hellwig <hch@....de>
To:     Dan Williams <dan.j.williams@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>
Cc:     Mike Snitzer <snitzer@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        linux-xfs@...r.kernel.org, nvdimm@...ts.linux.dev,
        linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: [PATCH 6/9] dax: remove __generic_fsdax_supported

Just implement generic_fsdax_supported directly out of line instead of
adding a wrapper.  Given that generic_fsdax_supported is only supplied
for CONFIG_FS_DAX builds this also allows to not provide it at all for
!CONFIG_FS_DAX builds.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 drivers/dax/super.c |  8 ++++----
 include/linux/dax.h | 16 ++--------------
 2 files changed, 6 insertions(+), 18 deletions(-)

diff --git a/drivers/dax/super.c b/drivers/dax/super.c
index 0f74f83101ab..8e8ccb3e956b 100644
--- a/drivers/dax/super.c
+++ b/drivers/dax/super.c
@@ -119,9 +119,8 @@ struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev)
 	return dax_get_by_host(bdev->bd_disk->disk_name);
 }
 EXPORT_SYMBOL_GPL(fs_dax_get_by_bdev);
-#endif
 
-bool __generic_fsdax_supported(struct dax_device *dax_dev,
+bool generic_fsdax_supported(struct dax_device *dax_dev,
 		struct block_device *bdev, int blocksize, sector_t start,
 		sector_t sectors)
 {
@@ -201,7 +200,8 @@ bool __generic_fsdax_supported(struct dax_device *dax_dev,
 	}
 	return true;
 }
-EXPORT_SYMBOL_GPL(__generic_fsdax_supported);
+EXPORT_SYMBOL_GPL(generic_fsdax_supported);
+#endif /* CONFIG_FS_DAX */
 
 /**
  * __bdev_dax_supported() - Check if the device supports dax for filesystem
@@ -360,7 +360,7 @@ bool dax_supported(struct dax_device *dax_dev, struct block_device *bdev,
 		return false;
 
 	id = dax_read_lock();
-	if (dax_alive(dax_dev))
+	if (dax_alive(dax_dev) && dax_dev->ops->dax_supported)
 		ret = dax_dev->ops->dax_supported(dax_dev, bdev, blocksize,
 						  start, len);
 	dax_read_unlock(id);
diff --git a/include/linux/dax.h b/include/linux/dax.h
index 379739b55408..0a3ef9701e03 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -123,16 +123,9 @@ static inline bool bdev_dax_supported(struct block_device *bdev, int blocksize)
 	return __bdev_dax_supported(bdev, blocksize);
 }
 
-bool __generic_fsdax_supported(struct dax_device *dax_dev,
+bool generic_fsdax_supported(struct dax_device *dax_dev,
 		struct block_device *bdev, int blocksize, sector_t start,
 		sector_t sectors);
-static inline bool generic_fsdax_supported(struct dax_device *dax_dev,
-		struct block_device *bdev, int blocksize, sector_t start,
-		sector_t sectors)
-{
-	return __generic_fsdax_supported(dax_dev, bdev, blocksize, start,
-			sectors);
-}
 
 static inline void fs_put_dax(struct dax_device *dax_dev)
 {
@@ -154,12 +147,7 @@ static inline bool bdev_dax_supported(struct block_device *bdev,
 	return false;
 }
 
-static inline bool generic_fsdax_supported(struct dax_device *dax_dev,
-		struct block_device *bdev, int blocksize, sector_t start,
-		sector_t sectors)
-{
-	return false;
-}
+#define generic_fsdax_supported		NULL
 
 static inline void fs_put_dax(struct dax_device *dax_dev)
 {
-- 
2.30.2

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