From: Trond Myklebust <trond.myklebust@hammerspace.com>
Date: Wed, 15 Dec 2021 16:38:15 -0500
Subject: [PATCH] NFS: Ensure the server has an up to date ctime before
 hardlinking
Git-commit: 204975036b34f55237bc44c8a302a88468ef21b5
Patch-mainline: v5.17
References: git-fixes

Creating a hard link 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: 9f7682728728 ("NFS: Move the delegation return down into nfs4_proc_link()")
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
@@ -2397,6 +2397,8 @@ nfs_link(struct dentry *old_dentry, stru
 
 	trace_nfs_link_enter(inode, dir, dentry);
 	d_drop(dentry);
+	if (S_ISREG(inode->i_mode))
+		nfs_sync_inode(inode);
 	error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name);
 	if (error == 0) {
 		ihold(inode);