From: Olga Kornievskaia <kolga@netapp.com>
Date: Wed, 16 Sep 2020 09:07:54 -0400
Subject: [PATCH] NFSv4.2: fix client's attribute cache management for
 copy_file_range
Git-commit: 16abd2a0c124a6c3543c88ca4c53c997c9fb4114
Patch-mainline: v5.9
References: git-fixes

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>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Acked-by: NeilBrown <neilb@suse.com>

---
 fs/nfs/nfs42proc.c |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -185,7 +185,15 @@ static ssize_t _nfs42_proc_copy(struct f
 
 	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_ATTR | NFS_INO_INVALID_DATA);
+	spin_unlock(&dst_inode->i_lock);
+	spin_lock(&file_inode(src)->i_lock);
+	NFS_I(file_inode(src))->cache_validity |= (NFS_INO_REVAL_PAGECACHE |
+			NFS_INO_REVAL_FORCED | NFS_INO_INVALID_ATIME);
+	spin_unlock(&file_inode(src)->i_lock);
 	status = res->write_res.count;
 out:
 	kfree(res->commit_res.verf);