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From: Trond Myklebust <trondmy@gmail.com>
To: linux-nfs@vger.kernel.org
Subject: [PATCH 4/5] NFSv4/pnfs: Fix a page lock leak in nfs_pageio_resend()
Date: Tue, 13 Aug 2019 10:28:05 -0400
Message-ID: <20190813142806.123268-4-trond.myklebust@hammerspace.com> (raw)
In-Reply-To: <20190813142806.123268-3-trond.myklebust@hammerspace.com>

If the attempt to resend the pages fails, we need to ensure that we
clean up those pages that were not transmitted.

Fixes: d600ad1f2bdb ("NFS41: pop some layoutget errors to application")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Cc: stable@vger.kernel.org # v4.5+
---
 fs/nfs/pagelist.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index ed4e1b07447b..15c254753f88 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -1251,20 +1251,22 @@ static void nfs_pageio_complete_mirror(struct nfs_pageio_descriptor *desc,
 int nfs_pageio_resend(struct nfs_pageio_descriptor *desc,
 		      struct nfs_pgio_header *hdr)
 {
-	LIST_HEAD(failed);
+	LIST_HEAD(pages);
 
 	desc->pg_io_completion = hdr->io_completion;
 	desc->pg_dreq = hdr->dreq;
-	while (!list_empty(&hdr->pages)) {
-		struct nfs_page *req = nfs_list_entry(hdr->pages.next);
+	list_splice_init(&hdr->pages, &pages);
+	while (!list_empty(&pages)) {
+		struct nfs_page *req = nfs_list_entry(pages.next);
 
 		if (!nfs_pageio_add_request(desc, req))
-			nfs_list_move_request(req, &failed);
+			break;
 	}
 	nfs_pageio_complete(desc);
-	if (!list_empty(&failed)) {
-		list_move(&failed, &hdr->pages);
-		return desc->pg_error < 0 ? desc->pg_error : -EIO;
+	if (!list_empty(&pages)) {
+		int err = desc->pg_error < 0 ? desc->pg_error : -EIO;
+		hdr->completion_ops->error_cleanup(&pages, err);
+		return err;
 	}
 	return 0;
 }
-- 
2.21.0


  reply index

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-13 14:28 [PATCH 1/5] NFS: Don't refresh attributes with mounted-on-file information Trond Myklebust
2019-08-13 14:28 ` [PATCH 2/5] NFSv4: Fix return values for nfs4_file_open() Trond Myklebust
2019-08-13 14:28   ` [PATCH 3/5] NFSv4: Fix return value in nfs_finish_open() Trond Myklebust
2019-08-13 14:28     ` Trond Myklebust [this message]
2019-08-13 14:28       ` [PATCH 5/5] NFS: Ensure O_DIRECT reports an error if the bytes read/written is 0 Trond Myklebust
2019-08-13 17:55       ` [PATCH 4/5] NFSv4/pnfs: Fix a page lock leak in nfs_pageio_resend() Sasha Levin

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