From: Trond Myklebust <trond.myklebust@hammerspace.com>
Date: Wed, 15 Dec 2021 16:38:16 -0500
Subject: [PATCH] NFS: Ensure the server has an up to date ctime before
 renaming
Git-commit: 6ff9d99bb88faebf134ca668842349d9718e5464
Patch-mainline: v5.17
References: git-fixes

Renaming a file is required by POSIX to update the file ctime, so
ensure that the file data is synced to disk so that we don't clobber the
updated ctime by writing back after creating the hard link.

Fixes: f2c2c552f119 ("NFS: Move delegation recall into the NFSv4 callback for rename_setup()")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Acked-by: NeilBrown <neilb@suse.com>

---
 fs/nfs/dir.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -2135,6 +2135,8 @@ int nfs_rename(struct inode *old_dir, st
 		}
 	}
 
+	if (S_ISREG(old_inode->i_mode))
+		nfs_sync_inode(old_inode);
 	task = nfs_async_rename(old_dir, new_dir, old_dentry, new_dentry, NULL);
 	if (IS_ERR(task)) {
 		error = PTR_ERR(task);