From: Darrick J. Wong <djwong@xxxxxxxxxx>
If iomap_iter::len is zero on the first call to iomap_iter(), we should
just return zero instead of calling ->iomap_begin with zero count. This
obviates the need for ->iomap_begin implementations to handle that
"correctly" by not returning a zero-length mapping.
Signed-off-by: "Darrick J. Wong" <djwong@xxxxxxxxxx>
---
fs/iomap/iter.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/fs/iomap/iter.c b/fs/iomap/iter.c
index 6ffc6a7b9ba502..b86a6a08627126 100644
--- a/fs/iomap/iter.c
+++ b/fs/iomap/iter.c
@@ -66,8 +66,11 @@ int iomap_iter(struct iomap_iter *iter, const struct iomap_ops *ops)
trace_iomap_iter(iter, ops, _RET_IP_);
- if (!iter->iomap.length)
+ if (!iter->iomap.length) {
+ if (iter->len == 0)
+ return 0;
goto begin;
+ }
/*
* Calculate how far the iter was advanced and the original length bytes
