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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 /drivers/dax/super.c
parent14ccee78fc82f5512908f4424f541549a5705b89 (diff)
downloadlinux-78f35473508118df5ea04b9515ac3f1aaec0a980.tar.bz2
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 'drivers/dax/super.c')
-rw-r--r--drivers/dax/super.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/dax/super.c b/drivers/dax/super.c
index 938eb4868f7f..b699aac268a6 100644
--- a/drivers/dax/super.c
+++ b/drivers/dax/super.c
@@ -46,6 +46,8 @@ void dax_read_unlock(int id)
EXPORT_SYMBOL_GPL(dax_read_unlock);
#ifdef CONFIG_BLOCK
+#include <linux/blkdev.h>
+
int bdev_dax_pgoff(struct block_device *bdev, sector_t sector, size_t size,
pgoff_t *pgoff)
{
@@ -59,6 +61,14 @@ int bdev_dax_pgoff(struct block_device *bdev, sector_t sector, size_t size,
}
EXPORT_SYMBOL(bdev_dax_pgoff);
+struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev)
+{
+ if (!blk_queue_dax(bdev->bd_queue))
+ return NULL;
+ return fs_dax_get_by_host(bdev->bd_disk->disk_name);
+}
+EXPORT_SYMBOL_GPL(fs_dax_get_by_bdev);
+
/**
* __bdev_dax_supported() - Check if the device supports dax for filesystem
* @sb: The superblock of the device