[PATCH v9 4/8] fsdax: Convert dax_iomap_zero to iter model

From: Shiyang Ruan
Date: Wed Sep 15 2021 - 06:45:57 EST


Let dax_iomap_zero() support iter model.

Signed-off-by: Shiyang Ruan <ruansy.fnst@xxxxxxxxxxx>
---
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 41c93929f20b..4f346e25e488 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(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..642de7ef1a10 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(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