linux-kernel - [PATCH v1 15/15] ceph: use put_user_pages() instead of ceph_put_page

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Date:   Thu, 11 Apr 2019 17:08:34 -0400
From:   jglisse@...hat.com
To:     linux-kernel@...r.kernel.org
Cc:     Jérôme Glisse <jglisse@...hat.com>,
        linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-mm@...ck.org, John Hubbard <jhubbard@...dia.com>,
        Jan Kara <jack@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
        Ming Lei <ming.lei@...hat.com>,
        Dave Chinner <david@...morbit.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Matthew Wilcox <willy@...radead.org>,
        Yan Zheng <zyan@...hat.com>, Sage Weil <sage@...hat.com>,
        Ilya Dryomov <idryomov@...il.com>, ceph-devel@...r.kernel.org
Subject: [PATCH v1 15/15] ceph: use put_user_pages() instead of ceph_put_page_vector()

From: Jérôme Glisse <jglisse@...hat.com>

When page reference were taken through GUP (get_user_page*()) we need
to drop them with put_user_pages().

Signed-off-by: Jérôme Glisse <jglisse@...hat.com>
Cc: linux-fsdevel@...r.kernel.org
Cc: linux-block@...r.kernel.org
Cc: linux-mm@...ck.org
Cc: John Hubbard <jhubbard@...dia.com>
Cc: Jan Kara <jack@...e.cz>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: Johannes Thumshirn <jthumshirn@...e.de>
Cc: Christoph Hellwig <hch@....de>
Cc: Jens Axboe <axboe@...nel.dk>
Cc: Ming Lei <ming.lei@...hat.com>
Cc: Dave Chinner <david@...morbit.com>
Cc: Jason Gunthorpe <jgg@...pe.ca>
Cc: Matthew Wilcox <willy@...radead.org>
Cc: Yan Zheng <zyan@...hat.com>
Cc: Sage Weil <sage@...hat.com>
Cc: Ilya Dryomov <idryomov@...il.com>
Cc: ceph-devel@...r.kernel.org
---
 fs/ceph/file.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 6c5b85f01721..5842ad3a4218 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -667,7 +667,8 @@ static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *to,
 			} else {
 				iov_iter_advance(to, 0);
 			}
-			ceph_put_page_vector(pages, num_pages, false);
+			/* iov_iter_get_pages_alloc() did call GUP */
+			put_user_pages(pages, num_pages);
 		} else {
 			int idx = 0;
 			size_t left = ret > 0 ? ret : 0;
-- 
2.20.1