linux-kernel - [PATCH 02/34] net/rds: convert put_page() to put_user

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Date:   Thu,  1 Aug 2019 19:16:21 -0700
From:   john.hubbard@...il.com
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ira Weiny <ira.weiny@...el.com>, Jan Kara <jack@...e.cz>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Jérôme Glisse <jglisse@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        amd-gfx@...ts.freedesktop.org, ceph-devel@...r.kernel.org,
        devel@...verdev.osuosl.org, devel@...ts.orangefs.org,
        dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        kvm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-block@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-fbdev@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-media@...r.kernel.org, linux-mm@...ck.org,
        linux-nfs@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org, linux-xfs@...r.kernel.org,
        netdev@...r.kernel.org, rds-devel@....oracle.com,
        sparclinux@...r.kernel.org, x86@...nel.org,
        xen-devel@...ts.xenproject.org, John Hubbard <jhubbard@...dia.com>,
        Santosh Shilimkar <santosh.shilimkar@...cle.com>,
        "David S . Miller" <davem@...emloft.net>
Subject: [PATCH 02/34] net/rds: convert put_page() to put_user_page*()

From: John Hubbard <jhubbard@...dia.com>

For pages that were retained via get_user_pages*(), release those pages
via the new put_user_page*() routines, instead of via put_page() or
release_pages().

This is part a tree-wide conversion, as described in commit fc1d8e7cca2d
("mm: introduce put_user_page*(), placeholder versions").

Cc: Santosh Shilimkar <santosh.shilimkar@...cle.com>
Cc: David S. Miller <davem@...emloft.net>
Cc: netdev@...r.kernel.org
Cc: linux-rdma@...r.kernel.org
Cc: rds-devel@....oracle.com
Signed-off-by: John Hubbard <jhubbard@...dia.com>
---
 net/rds/info.c    |  5 ++---
 net/rds/message.c |  2 +-
 net/rds/rdma.c    | 15 +++++++--------
 3 files changed, 10 insertions(+), 12 deletions(-)

diff --git a/net/rds/info.c b/net/rds/info.c
index 03f6fd56d237..ca6af2889adf 100644
--- a/net/rds/info.c
+++ b/net/rds/info.c
@@ -162,7 +162,6 @@ int rds_info_getsockopt(struct socket *sock, int optname, char __user *optval,
 	struct rds_info_lengths lens;
 	unsigned long nr_pages = 0;
 	unsigned long start;
-	unsigned long i;
 	rds_info_func func;
 	struct page **pages = NULL;
 	int ret;
@@ -235,8 +234,8 @@ int rds_info_getsockopt(struct socket *sock, int optname, char __user *optval,
 		ret = -EFAULT;
 
 out:
-	for (i = 0; pages && i < nr_pages; i++)
-		put_page(pages[i]);
+	if (pages)
+		put_user_pages(pages, nr_pages);
 	kfree(pages);
 
 	return ret;
diff --git a/net/rds/message.c b/net/rds/message.c
index 50f13f1d4ae0..d7b0d266c437 100644
--- a/net/rds/message.c
+++ b/net/rds/message.c
@@ -404,7 +404,7 @@ static int rds_message_zcopy_from_user(struct rds_message *rm, struct iov_iter *
 			int i;
 
 			for (i = 0; i < rm->data.op_nents; i++)
-				put_page(sg_page(&rm->data.op_sg[i]));
+				put_user_page(sg_page(&rm->data.op_sg[i]));
 			mmp = &rm->data.op_mmp_znotifier->z_mmp;
 			mm_unaccount_pinned_pages(mmp);
 			ret = -EFAULT;
diff --git a/net/rds/rdma.c b/net/rds/rdma.c
index 916f5ec373d8..6762e8696b99 100644
--- a/net/rds/rdma.c
+++ b/net/rds/rdma.c
@@ -162,8 +162,7 @@ static int rds_pin_pages(unsigned long user_addr, unsigned int nr_pages,
 				  pages);
 
 	if (ret >= 0 && ret < nr_pages) {
-		while (ret--)
-			put_page(pages[ret]);
+		put_user_pages(pages, ret);
 		ret = -EFAULT;
 	}
 
@@ -276,7 +275,7 @@ static int __rds_rdma_map(struct rds_sock *rs, struct rds_get_mr_args *args,
 
 	if (IS_ERR(trans_private)) {
 		for (i = 0 ; i < nents; i++)
-			put_page(sg_page(&sg[i]));
+			put_user_page(sg_page(&sg[i]));
 		kfree(sg);
 		ret = PTR_ERR(trans_private);
 		goto out;
@@ -464,9 +463,10 @@ void rds_rdma_free_op(struct rm_rdma_op *ro)
 		 * to local memory */
 		if (!ro->op_write) {
 			WARN_ON(!page->mapping && irqs_disabled());
-			set_page_dirty(page);
+			put_user_pages_dirty_lock(&page, 1, true);
+		} else {
+			put_user_page(page);
 		}
-		put_page(page);
 	}
 
 	kfree(ro->op_notifier);
@@ -481,8 +481,7 @@ void rds_atomic_free_op(struct rm_atomic_op *ao)
 	/* Mark page dirty if it was possibly modified, which
 	 * is the case for a RDMA_READ which copies from remote
 	 * to local memory */
-	set_page_dirty(page);
-	put_page(page);
+	put_user_pages_dirty_lock(&page, 1, true);
 
 	kfree(ao->op_notifier);
 	ao->op_notifier = NULL;
@@ -867,7 +866,7 @@ int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm,
 	return ret;
 err:
 	if (page)
-		put_page(page);
+		put_user_page(page);
 	rm->atomic.op_active = 0;
 	kfree(rm->atomic.op_notifier);
 
-- 
2.22.0