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authorDan Williams <dan.j.williams@intel.com>2017-05-29 13:02:52 -0700
committerDan Williams <dan.j.williams@intel.com>2017-06-15 14:34:59 -0700
commitabebfbe2f7315dd3ec9a0c69596a76e32beb5749 (patch)
treee0b8a531424d7625e19a82a9151fa64a0a30671b /include/linux/dax.h
parent3c1cebff23cdca01c421411e953a9e239f2b9ef9 (diff)
dm: add ->flush() dax operation support
Allow device-mapper to route flush operations to the per-target implementation. In order for the device stacking to work we need a dax_dev and a pgoff relative to that device. This gives each layer of the stack the information it needs to look up the operation pointer for the next level. This conceptually allows for an array of mixed device drivers with varying flush implementations. Reviewed-by: Toshi Kani <toshi.kani@hpe.com> Reviewed-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'include/linux/dax.h')
-rw-r--r--include/linux/dax.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/dax.h b/include/linux/dax.h
index 407dd3ff6e54..1f6b6072af64 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -82,6 +82,8 @@ long dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, long nr_pages,
void **kaddr, pfn_t *pfn);
size_t dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr,
size_t bytes, struct iov_iter *i);
+void dax_flush(struct dax_device *dax_dev, pgoff_t pgoff, void *addr,
+ size_t size);
/*
* We use lowest available bit in exceptional entry for locking, one bit for