linux-kernel - [RFC PATCH 08/11] iov_iter: Drop iov_iter

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Message-ID: <20230630152524.661208-9-dhowells@redhat.com>
Date:   Fri, 30 Jun 2023 16:25:21 +0100
From:   David Howells <dhowells@...hat.com>
To:     Jens Axboe <axboe@...nel.dk>, Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>
Cc:     David Howells <dhowells@...hat.com>,
        Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
        Jeff Layton <jlayton@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Hillf Danton <hdanton@...a.com>,
        Christian Brauner <brauner@...nel.org>,
        linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Christoph Hellwig <hch@....de>,
        Christian Brauner <christian@...uner.io>
Subject: [RFC PATCH 08/11] iov_iter: Drop iov_iter_rw() and fold in last user

Drop the last usage of iov_iter_rw() into __iov_iter_get_pages_alloc().

Signed-off-by: David Howells <dhowells@...hat.com>
cc: Christoph Hellwig <hch@....de>
cc: Jens Axboe <axboe@...nel.dk>
cc: Christian Brauner <christian@...uner.io>
cc: Alexander Viro <viro@...iv.linux.org.uk>
cc: linux-block@...r.kernel.org
cc: linux-fsdevel@...r.kernel.org
---
 include/linux/uio.h | 5 -----
 lib/iov_iter.c      | 2 +-
 2 files changed, 1 insertion(+), 6 deletions(-)

diff --git a/include/linux/uio.h b/include/linux/uio.h
index ff81e5ccaef2..70e12f536f8f 100644
--- a/include/linux/uio.h
+++ b/include/linux/uio.h
@@ -136,11 +136,6 @@ static inline bool iov_iter_is_xarray(const struct iov_iter *i)
 	return iov_iter_type(i) == ITER_XARRAY;
 }
 
-static inline unsigned char iov_iter_rw(const struct iov_iter *i)
-{
-	return i->data_source ? WRITE : READ;
-}
-
 static inline bool user_backed_iter(const struct iov_iter *i)
 {
 	return i->user_backed;
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index b667b1e2f688..b8c52231a6ff 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -1097,7 +1097,7 @@ static ssize_t __iov_iter_get_pages_alloc(struct iov_iter *i,
 		unsigned long addr;
 		int res;
 
-		if (iov_iter_rw(i) != WRITE)
+		if (i->data_source == ITER_SOURCE)
 			gup_flags |= FOLL_WRITE;
 		if (i->nofault)
 			gup_flags |= FOLL_NOFAULT;