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authorDan Williams <dan.j.williams@intel.com>2017-08-30 09:16:38 -0700
committerDan Williams <dan.j.williams@intel.com>2017-08-30 09:16:38 -0700
commit78f35473508118df5ea04b9515ac3f1aaec0a980 (patch)
tree176dba5e8788be7cd4bb4d422e21b25fa190ec67 /include
parent14ccee78fc82f5512908f4424f541549a5705b89 (diff)
dax: introduce a fs_dax_get_by_bdev() helper
Add a helper that can replace the following common pattern: if (blk_queue_dax(bdev->bd_queue)) fs_dax_get_by_host(bdev->bd_disk->disk_name); This will be used to move dax_device lookup from iomap-operation time to fs-mount time. Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/dax.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/dax.h b/include/linux/dax.h
index df97b7af7e2c..ac8afa18f707 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -57,6 +57,7 @@ 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);
#else
static inline int bdev_dax_supported(struct super_block *sb, int blocksize)
{
@@ -71,6 +72,11 @@ static inline struct dax_device *fs_dax_get_by_host(const char *host)
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)
+{
+ return NULL;
+}
#endif
int dax_read_lock(void);