diff options
| author | Dan Williams <dan.j.williams@intel.com> | 2017-08-30 09:16:38 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2017-08-30 09:16:38 -0700 |
| commit | 78f35473508118df5ea04b9515ac3f1aaec0a980 (patch) | |
| tree | 176dba5e8788be7cd4bb4d422e21b25fa190ec67 /include/linux/dax.h | |
| parent | 14ccee78fc82f5512908f4424f541549a5705b89 (diff) | |
| download | lwn-78f35473508118df5ea04b9515ac3f1aaec0a980.tar.gz lwn-78f35473508118df5ea04b9515ac3f1aaec0a980.zip | |
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/linux/dax.h')
| -rw-r--r-- | include/linux/dax.h | 6 |
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); |