linux-kernel - [PATCH 4.4 09/54] SUNRPC reverting d03727b248d0 ("NFSv4 fix CLOSE not waiting for direct IO compeletion")

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Message-Id: <20200730074421.663908528@linuxfoundation.org>
Date:   Thu, 30 Jul 2020 10:04:48 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Olga Kornievskaia <kolga@...app.com>,
        Anna Schumaker <Anna.Schumaker@...app.com>
Subject: [PATCH 4.4 09/54] SUNRPC reverting d03727b248d0 ("NFSv4 fix CLOSE not waiting for direct IO compeletion")

From: Olga Kornievskaia <kolga@...app.com>

commit 65caafd0d2145d1dd02072c4ced540624daeab40 upstream.

Reverting commit d03727b248d0 "NFSv4 fix CLOSE not waiting for
direct IO compeletion". This patch made it so that fput() by calling
inode_dio_done() in nfs_file_release() would wait uninterruptably
for any outstanding directIO to the file (but that wait on IO should
be killable).

The problem the patch was also trying to address was REMOVE returning
ERR_ACCESS because the file is still opened, is supposed to be resolved
by server returning ERR_FILE_OPEN and not ERR_ACCESS.

Signed-off-by: Olga Kornievskaia <kolga@...app.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@...app.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/nfs/direct.c |   13 ++++---------
 fs/nfs/file.c   |    1 -
 2 files changed, 4 insertions(+), 10 deletions(-)

--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -385,6 +385,8 @@ static void nfs_direct_complete(struct n
 	if (write)
 		nfs_zap_mapping(inode, inode->i_mapping);
 
+	inode_dio_end(inode);
+
 	if (dreq->iocb) {
 		long res = (long) dreq->error;
 		if (!res)
@@ -394,10 +396,7 @@ static void nfs_direct_complete(struct n
 
 	complete_all(&dreq->completion);
 
-	igrab(inode);
 	nfs_direct_req_release(dreq);
-	inode_dio_end(inode);
-	iput(inode);
 }
 
 static void nfs_direct_readpage_release(struct nfs_page *req)
@@ -538,10 +537,8 @@ static ssize_t nfs_direct_read_schedule_
 	 * generic layer handle the completion.
 	 */
 	if (requested_bytes == 0) {
-		igrab(inode);
-		nfs_direct_req_release(dreq);
 		inode_dio_end(inode);
-		iput(inode);
+		nfs_direct_req_release(dreq);
 		return result < 0 ? result : -EIO;
 	}
 
@@ -942,10 +939,8 @@ static ssize_t nfs_direct_write_schedule
 	 * generic layer handle the completion.
 	 */
 	if (requested_bytes == 0) {
-		igrab(inode);
-		nfs_direct_req_release(dreq);
 		inode_dio_end(inode);
-		iput(inode);
+		nfs_direct_req_release(dreq);
 		return result < 0 ? result : -EIO;
 	}
 
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -82,7 +82,6 @@ nfs_file_release(struct inode *inode, st
 	dprintk("NFS: release(%pD2)\n", filp);
 
 	nfs_inc_stats(inode, NFSIOS_VFSRELEASE);
-	inode_dio_wait(inode);
 	nfs_file_clear_open_context(filp);
 	return 0;
 }