[PATCH 4/9] iov_iter: set nr_segs = 1 for ITER_UBUF

[Jens Axboe <axboe@kernel.dk>]

To avoid needing to check if a given user backed iov_iter is of type
ITER_IOVEC or ITER_UBUF, set the number of segments for the ITER_UBUF
case to 1 as we're carrying a single segment.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 include/linux/uio.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/uio.h b/include/linux/uio.h
index 192831775d2b..953ccba94164 100644
--- a/include/linux/uio.h
+++ b/include/linux/uio.h
@@ -390,7 +390,8 @@ static inline void iov_iter_ubuf(struct iov_iter *i, unsigned int direction,
 		.user_backed = true,
 		.data_source = direction,
 		.ubuf = buf,
-		.count = count
+		.count = count,
+		.nr_segs = 1
 	};
 }
 /* Flags for iov_iter_get/extract_pages*() */
-- 
2.39.2