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authorDan Williams <dan.j.williams@intel.com>2018-05-02 16:46:33 +0300
committerDan Williams <dan.j.williams@intel.com>2018-05-23 09:18:31 +0300
commitb3a9a0c36e1f7b9e2e6cf965c2bb973624f2b3b9 (patch)
tree54f43a8720a29159310b112cf21e7d3a3b5dce85 /include/linux/dax.h
parent522239b445a2de988edb81672963708a6aaf9046 (diff)
downloadlinux-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/dax.h')
-rw-r--r--include/linux/dax.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/dax.h b/include/linux/dax.h
index f9eb22ad341e..a43b396fb336 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -20,6 +20,9 @@ struct dax_operations {
/* copy_from_iter: required operation for fs-dax direct-i/o */
size_t (*copy_from_iter)(struct dax_device *, pgoff_t, void *, size_t,
struct iov_iter *);
+ /* copy_to_iter: required operation for fs-dax direct-i/o */
+ size_t (*copy_to_iter)(struct dax_device *, pgoff_t, void *, size_t,
+ struct iov_iter *);
};
extern struct attribute_group dax_attribute_group;
@@ -118,6 +121,8 @@ 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);
+size_t dax_copy_to_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, void *addr, size_t size);
ssize_t dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter,