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iomap: add a IOMAP_DAX flag

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Add a flag so that the file system can easily detect DAX operations
based just on the iomap operation requested instead of looking at
inode state using IS_DAX.  This will be needed to apply the to be
added partition offset only for operations that actually use DAX,
but not things like fiemap that are based on the block device.
In the long run it should also allow turning the bdev, dax_dev
and inline_data into a union.

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/20211129102203.2243509-25-hch@lst.de
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Christoph Hellwig
2021-11-29 11:21:58 +01:00
committed by Dan Williams
parent 740fd671e0
commit 952da06375
6 changed files with 18 additions and 10 deletions
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5
include/linux/iomap.h
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@@ -141,6 +141,11 @@ struct iomap_page_ops {
#define IOMAP_NOWAIT (1 << 5) /* do not block */
#define IOMAP_OVERWRITE_ONLY (1 << 6) /* only pure overwrites allowed */
#define IOMAP_UNSHARE (1 << 7) /* unshare_file_range */
#ifdef CONFIG_FS_DAX
#define IOMAP_DAX (1 << 8) /* DAX mapping */
#else
#define IOMAP_DAX 0
#endif /* CONFIG_FS_DAX */
struct iomap_ops {
/*