[PATCH v10 4/8] fsdax: Convert dax_iomap_zero to iter model

[Shiyang Ruan]

Let dax_iomap_zero() support iter model.

Signed-off-by: Shiyang Ruan <ruansy.fnst@xxxxxxxxxxx>
Reviewed-by: Darrick J. Wong <djwong@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
---
 fs/dax.c               | 3 ++-
 fs/iomap/buffered-io.c | 3 +--
 include/linux/dax.h    | 3 ++-
 3 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/fs/dax.c b/fs/dax.c
index b437badfe0dd..debe459680f2 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -1209,8 +1209,9 @@ static vm_fault_t dax_pmd_load_hole(struct xa_state *xas, struct vm_fault *vmf,
 }
 #endif /* CONFIG_FS_DAX_PMD */
 
-s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap)
+s64 dax_iomap_zero(const struct iomap_iter *iter, loff_t pos, u64 length)
 {
+	const struct iomap *iomap = &iter->iomap;
 	sector_t sector = iomap_sector(iomap, pos & PAGE_MASK);
 	pgoff_t pgoff;
 	long rc, id;
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 9cc5798423d1..84a861d3b3e0 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -889,7 +889,6 @@ static s64 __iomap_zero_iter(struct iomap_iter *iter, loff_t pos, u64 length)
 
 static loff_t iomap_zero_iter(struct iomap_iter *iter, bool *did_zero)
 {
-	struct iomap *iomap = &iter->iomap;
 	const struct iomap *srcmap = iomap_iter_srcmap(iter);
 	loff_t pos = iter->pos;
 	loff_t length = iomap_length(iter);
@@ -903,7 +902,7 @@ static loff_t iomap_zero_iter(struct iomap_iter *iter, bool *did_zero)
 		s64 bytes;
 
 		if (IS_DAX(iter->inode))
-			bytes = dax_iomap_zero(pos, length, iomap);
+			bytes = dax_iomap_zero(iter, pos, length);
 		else
 			bytes = __iomap_zero_iter(iter, pos, length);
 		if (bytes < 0)
diff --git a/include/linux/dax.h b/include/linux/dax.h
index 2619d94c308d..b6f5d0d30065 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -13,6 +13,7 @@ typedef unsigned long dax_entry_t;
 
 struct iomap_ops;
 struct iomap;
+struct iomap_iter;
 struct dax_device;
 struct dax_operations {
 	/*
@@ -210,7 +211,7 @@ vm_fault_t dax_finish_sync_fault(struct vm_fault *vmf,
 int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index);
 int dax_invalidate_mapping_entry_sync(struct address_space *mapping,
 				      pgoff_t index);
-s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap);
+s64 dax_iomap_zero(const struct iomap_iter *iter, loff_t pos, u64 length);
 static inline bool dax_mapping(struct address_space *mapping)
 {
 	return mapping->host && IS_DAX(mapping->host);
-- 
2.33.0