NFS: Ensure the server has an up to date ctime before hardlinking

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>

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 7dee3fd103824b2cb7f03efe7e686b1f48f74785..3f8e5122d00455b9ee573fab325f117a15f32603 100644 (file)
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -2379,6 +2379,8 @@ nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
 
        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) {
                nfs_set_verifier(dentry, nfs_save_change_attribute(dir));