[PATCH 27/29] dax: fix up some of the block device related ifdefs

Christoph Hellwig
2021-11-29T11:09:44Z

The DAX device <-> block device association is only enabled if
CONFIG_BLOCK is enabled. Update dax.h to account for that and use
the right conditions for the fs_put_dax stub as well.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
---
include/linux/dax.h | 33 ++++++++++++++++-----------------
1 file changed, 16 insertions(+), 17 deletions(-)

diff --git a/include/linux/dax.h b/include/linux/dax.h
index f6f353382cc90..87ae4c9b1d65b 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -108,24 +108,15 @@ static inline bool daxdev_mapping_supported(struct vm_area_struct *vma,
#endif

struct writeback_control;
-#if IS_ENABLED(CONFIG_FS_DAX)
+#if defined(CONFIG_BLOCK) && defined(CONFIG_FS_DAX)
int dax_add_host(struct dax_device *dax_dev, struct gendisk *disk);
void dax_remove_host(struct gendisk *disk);
-
+struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev,
+ u64 *start_off);
static inline void fs_put_dax(struct dax_device *dax_dev)
{
put_dax(dax_dev);
}
-
-struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev,
- u64 *start_off);
-int dax_writeback_mapping_range(struct address_space *mapping,
- struct dax_device *dax_dev, struct writeback_control *wbc);
-
-struct page *dax_layout_busy_page(struct address_space *mapping);
-struct page *dax_layout_busy_page_range(struct address_space *mapping, loff_t start, loff_t end);
-dax_entry_t dax_lock_page(struct page *page);
-void dax_unlock_page(struct page *page, dax_entry_t cookie);
#else
static inline int dax_add_host(struct dax_device *dax_dev, struct gendisk *disk)
{
@@ -134,17 +125,25 @@ static inline int dax_add_host(struct dax_device *dax_dev, struct gendisk *disk)
static inline void dax_remove_host(struct gendisk *disk)
{
}
-
-static inline void fs_put_dax(struct dax_device *dax_dev)
-{
-}
-
static inline struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev,
u64 *start_off)
{
return NULL;
}
+static inline void fs_put_dax(struct dax_device *dax_dev)
+{
+}
+#endif /* CONFIG_BLOCK && CONFIG_FS_DAX */

+#if IS_ENABLED(CONFIG_FS_DAX)
+int dax_writeback_mapping_range(struct address_space *mapping,
+ struct dax_device *dax_dev, struct writeback_control *wbc);
+
+struct page *dax_layout_busy_page(struct address_space *mapping);
+struct page *dax_layout_busy_page_range(struct address_space *mapping, loff_t start, loff_t end);
+dax_entry_t dax_lock_page(struct page *page);
+void dax_unlock_page(struct page *page, dax_entry_t cookie);
+#else
static inline struct page *dax_layout_busy_page(struct address_space *mapping)
{
return NULL;
--
2.30.2