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| author |   Dan Williams <dan.j.williams@intel.com> | 2017-05-29 12:57:56 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2017-06-09 09:22:21 -0700 |
| commit | 7e026c8c0a4200da86bc51edeaad79dcdccf78ca (patch) | |
| tree | b1e30796161a6b1696ce75c2098d2fb980cb6a44 /include/linux/dax.h | |
| parent | x86, uaccess: introduce copy_from_iter_flushcache for pmem / cache-bypass operations (diff) | |
| download | linux-dev-7e026c8c0a4200da86bc51edeaad79dcdccf78ca.tar.xz linux-dev-7e026c8c0a4200da86bc51edeaad79dcdccf78ca.zip | |
dm: add ->copy_from_iter() dax operation support
Allow device-mapper to route copy_from_iter 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 copy_from_iter 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.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/dax.h b/include/linux/dax.h index bbe79ed90e2b..28e398f8c59e 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -78,6 +78,8 @@ void kill_dax(struct dax_device *dax_dev); void *dax_get_private(struct dax_device *dax_dev); 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); /* * We use lowest available bit in exceptional entry for locking, one bit for |