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dax: return the partition offset from fs_dax_get_by_bdev

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Prepare for the removal of the block_device from the DAX I/O path by
returning the partition offset from fs_dax_get_by_bdev so that the file
systems have it at hand for use during I/O.

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>
Link: https://lore.kernel.org/r/20211129102203.2243509-26-hch@lst.de
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Christoph Hellwig
2021-11-29 11:21:59 +01:00
committed by Dan Williams
parent 952da06375
commit cd913c76f4
11 changed files with 22 additions and 12 deletions
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6
include/linux/dax.h
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@@ -117,7 +117,8 @@ 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);
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);
@@ -138,7 +139,8 @@ 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)
static inline struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev,
u64 *start_off)
{
return NULL;
}