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From:   Olga Kornievskaia <olga.kornievskaia@gmail.com>
To:     trond.myklebust@hammerspace.com, anna.schumaker@netapp.com
Cc:     linux-nfs@vger.kernel.org, jencce.kernel@gmail.com
Subject: [PATCH v2 1/1] NFSv4.2: fix client's attribute cache management for copy_file_range
Date:   Wed, 16 Sep 2020 09:07:54 -0400
Message-Id: <20200916130754.8774-1-olga.kornievskaia@gmail.com>
Sender: linux-nfs-owner@vger.kernel.org
Precedence: bulk

From: Olga Kornievskaia <kolga@netapp.com>

After client is done with the COPY operation, it needs to invalidate
its pagecache (as it did no reading or writing of the data locally)
and it needs to invalidate it's attributes just like it would have
for a read on the source file and write on the destination file.

Once the linux server started giving out read delegations to
read+write opens, the destination file of the copy_file range
started having delegations and not doing syncup on close of the
file leading to xfstest failures for generic/430,431,432,433,565.

v2: changing cache_validity needs to be protected by the i_lock.

Reported-by: Murphy Zhou <jencce.kernel@gmail.com>
Fixes: 2e72448b07dc ("NFS: Add COPY nfs operation")
Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
---
 fs/nfs/nfs42proc.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
index 142225f0af59..2b2211d1234e 100644
--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -356,7 +356,15 @@ static ssize_t _nfs42_proc_copy(struct file *src,
 
 	truncate_pagecache_range(dst_inode, pos_dst,
 				 pos_dst + res->write_res.count);
-
+	spin_lock(&dst_inode->i_lock);
+	NFS_I(dst_inode)->cache_validity |= (NFS_INO_REVAL_PAGECACHE |
+			NFS_INO_REVAL_FORCED | NFS_INO_INVALID_SIZE |
+			NFS_INO_INVALID_ATTR | NFS_INO_INVALID_DATA);
+	spin_unlock(&dst_inode->i_lock);
+	spin_lock(&src_inode->i_lock);
+	NFS_I(src_inode)->cache_validity |= (NFS_INO_REVAL_PAGECACHE |
+			NFS_INO_REVAL_FORCED | NFS_INO_INVALID_ATIME);
+	spin_unlock(&src_inode->i_lock);
 	status = res->write_res.count;
 out:
 	if (args->sync)
-- 
2.18.1