From: Jens Axboe <axboe@kernel.dk>
Date: Tue, 28 Mar 2023 20:29:03 +0000 (-0600)
Subject: iov_iter: set nr_segs = 1 for ITER_UBUF
X-Git-Tag: v6.4-rc1~214^2~4
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cd0bd57a9de59019fe99e9305a2337a66a4f9d39;p=thirdparty%2Fkernel%2Flinux.git

iov_iter: set nr_segs = 1 for ITER_UBUF

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>
---

diff --git a/include/linux/uio.h b/include/linux/uio.h
index 7f585ceedcb24..5dbd2dcab35c8 100644
--- a/include/linux/uio.h
+++ b/include/linux/uio.h
@@ -355,7 +355,8 @@ 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*() */