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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Trond Myklebust <trond.myklebust@hammerspace.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.14 52/57] NFS: Clean up list moves of struct nfs_page
Date:   Wed,  4 Sep 2019 19:54:20 +0200
Message-Id: <20190904175306.975236128@linuxfoundation.org>
In-Reply-To: <20190904175301.777414715@linuxfoundation.org>
References: <20190904175301.777414715@linuxfoundation.org>
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[ Upstream commit 078b5fd92c4913dd367361db6c28568386077c89 ]

In several places we're just moving the struct nfs_page from one list to
another by first removing from the existing list, then adding to the new
one.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/nfs/direct.c          |  3 +--
 fs/nfs/pagelist.c        | 12 ++++--------
 include/linux/nfs_page.h | 10 ++++++++++
 3 files changed, 15 insertions(+), 10 deletions(-)

diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index 89c03a507dd9d..0c5e56702b19e 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -664,8 +664,7 @@ static void nfs_direct_write_reschedule(struct nfs_direct_req *dreq)
 
 	list_for_each_entry_safe(req, tmp, &reqs, wb_list) {
 		if (!nfs_pageio_add_request(&desc, req)) {
-			nfs_list_remove_request(req);
-			nfs_list_add_request(req, &failed);
+			nfs_list_move_request(req, &failed);
 			spin_lock(&cinfo.inode->i_lock);
 			dreq->flags = 0;
 			if (desc.pg_error < 0)
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index 28b013d1d44ae..a7aa028a5b0bb 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -768,8 +768,7 @@ int nfs_generic_pgio(struct nfs_pageio_descriptor *desc,
 	pageused = 0;
 	while (!list_empty(head)) {
 		req = nfs_list_entry(head->next);
-		nfs_list_remove_request(req);
-		nfs_list_add_request(req, &hdr->pages);
+		nfs_list_move_request(req, &hdr->pages);
 
 		if (!last_page || last_page != req->wb_page) {
 			pageused++;
@@ -961,8 +960,7 @@ static int nfs_pageio_do_add_request(struct nfs_pageio_descriptor *desc,
 	}
 	if (!nfs_can_coalesce_requests(prev, req, desc))
 		return 0;
-	nfs_list_remove_request(req);
-	nfs_list_add_request(req, &mirror->pg_list);
+	nfs_list_move_request(req, &mirror->pg_list);
 	mirror->pg_count += req->wb_bytes;
 	return 1;
 }
@@ -994,8 +992,7 @@ nfs_pageio_cleanup_request(struct nfs_pageio_descriptor *desc,
 {
 	LIST_HEAD(head);
 
-	nfs_list_remove_request(req);
-	nfs_list_add_request(req, &head);
+	nfs_list_move_request(req, &head);
 	desc->pg_completion_ops->error_cleanup(&head);
 }
 
@@ -1241,9 +1238,8 @@ int nfs_pageio_resend(struct nfs_pageio_descriptor *desc,
 	while (!list_empty(&hdr->pages)) {
 		struct nfs_page *req = nfs_list_entry(hdr->pages.next);
 
-		nfs_list_remove_request(req);
 		if (!nfs_pageio_add_request(desc, req))
-			nfs_list_add_request(req, &failed);
+			nfs_list_move_request(req, &failed);
 	}
 	nfs_pageio_complete(desc);
 	if (!list_empty(&failed)) {
diff --git a/include/linux/nfs_page.h b/include/linux/nfs_page.h
index e27572d30d977..ad69430fd0eb5 100644
--- a/include/linux/nfs_page.h
+++ b/include/linux/nfs_page.h
@@ -164,6 +164,16 @@ nfs_list_add_request(struct nfs_page *req, struct list_head *head)
 	list_add_tail(&req->wb_list, head);
 }
 
+/**
+ * nfs_list_move_request - Move a request to a new list
+ * @req: request
+ * @head: head of list into which to insert the request.
+ */
+static inline void
+nfs_list_move_request(struct nfs_page *req, struct list_head *head)
+{
+	list_move_tail(&req->wb_list, head);
+}
 
 /**
  * nfs_list_remove_request - Remove a request from its wb_list
-- 
2.20.1