From: Jens Axboe <axboe@kernel.dk>
Date: Fri, 24 Mar 2023 20:35:49 +0000 (-0600)
Subject: iov_iter: convert import_single_range() to ITER_UBUF
X-Git-Tag: iter-ubuf.2-2023-04-21~2
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=e03ad4ee2783e41afc90cc7848468aef10741c0e;p=linux-block.git

iov_iter: convert import_single_range() to ITER_UBUF

Since we're just importing a single vector, we don't have to turn it
into an ITER_IOVEC. Instead turn it into an ITER_UBUF, which is cheaper
to iterate.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 87488c4aad3f..f411bda1171f 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -1870,9 +1870,7 @@ int import_single_range(int rw, void __user *buf, size_t len,
 	if (unlikely(!access_ok(buf, len)))
 		return -EFAULT;
 
-	iov->iov_base = buf;
-	iov->iov_len = len;
-	iov_iter_init(i, rw, iov, 1, len);
+	iov_iter_ubuf(i, rw, buf, len);
 	return 0;
 }
 EXPORT_SYMBOL(import_single_range);