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

[ Upstream commit 204975036b34f55237bc44c8a302a88468ef21b5 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index f2ea5c244531384fd39ed054b1be80b31b3bbf36..e470df394f3a987a5c8f9de40c222eaf971b277e 100644 (file)
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -2033,6 +2033,8 @@ 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) {
                ihold(inode);