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| author | Dan Williams <dan.j.williams@intel.com> | 2018-05-02 16:46:33 +0300 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2018-05-23 09:18:31 +0300 |
| commit | b3a9a0c36e1f7b9e2e6cf965c2bb973624f2b3b9 (patch) | |
| tree | 54f43a8720a29159310b112cf21e7d3a3b5dce85 /include/linux/device-mapper.h | |
| parent | 522239b445a2de988edb81672963708a6aaf9046 (diff) | |
| download | linux-b3a9a0c36e1f7b9e2e6cf965c2bb973624f2b3b9.tar.xz | |
dax: Introduce a ->copy_to_iter dax operation
Similar to the ->copy_from_iter() operation, a platform may want to
deploy an architecture or device specific routine for handling reads
from a dax_device like /dev/pmemX. On x86 this routine will point to a
machine check safe version of copy_to_iter(). For now, add the plumbing
to device-mapper and the dax core.
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Mike Snitzer <snitzer@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'include/linux/device-mapper.h')
| -rw-r--r-- | include/linux/device-mapper.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index 31fef7c34185..6fb0808e87c8 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -133,7 +133,7 @@ typedef int (*dm_busy_fn) (struct dm_target *ti); */ typedef long (*dm_dax_direct_access_fn) (struct dm_target *ti, pgoff_t pgoff, long nr_pages, void **kaddr, pfn_t *pfn); -typedef size_t (*dm_dax_copy_from_iter_fn)(struct dm_target *ti, pgoff_t pgoff, +typedef size_t (*dm_dax_copy_iter_fn)(struct dm_target *ti, pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i); #define PAGE_SECTORS (PAGE_SIZE / 512) @@ -184,7 +184,8 @@ struct target_type { dm_iterate_devices_fn iterate_devices; dm_io_hints_fn io_hints; dm_dax_direct_access_fn direct_access; - dm_dax_copy_from_iter_fn dax_copy_from_iter; + dm_dax_copy_iter_fn dax_copy_from_iter; + dm_dax_copy_iter_fn dax_copy_to_iter; /* For internal device-mapper use. */ struct list_head list; |