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Commit 78f35473 authored by Dan Williams's avatar Dan Williams
Browse files

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: default avatarJan Kara <jack@suse.cz>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent 14ccee78

drivers/dax/super.c

+10 −0
Original line number Original line Diff line number Diff line
@@ -46,6 +46,8 @@ void dax_read_unlock(int id) 
EXPORT_SYMBOL_GPL(dax_read_unlock);

EXPORT_SYMBOL_GPL(dax_read_unlock);





#ifdef CONFIG_BLOCK

#ifdef CONFIG_BLOCK

#include <linux/blkdev.h>



int bdev_dax_pgoff(struct block_device *bdev, sector_t sector, size_t size,

int bdev_dax_pgoff(struct block_device *bdev, sector_t sector, size_t size,

		pgoff_t *pgoff)

		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);

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

 * __bdev_dax_supported() - Check if the device supports dax for filesystem

 * @sb: The superblock of the device

 * @sb: The superblock of the device

include/linux/dax.h

+6 −0
Original line number Original line Diff line number Diff line
@@ -57,6 +57,7 @@ static inline void fs_put_dax(struct dax_device *dax_dev) 
	put_dax(dax_dev);

	put_dax(dax_dev);

}

}





struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev);

#else

#else

static inline int bdev_dax_supported(struct super_block *sb, int blocksize)

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 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

#endif





int dax_read_lock(void);

int dax_read_lock(void);