NFS: Add a super_block backpointer to the nfs_server struct
NFS_SB() returns the pointer to an nfs_server struct, given a pointer to a super_block. But we have no way to go back the other way. Add a super_block backpointer field so that, given an nfs_server struct, it is easy to get to the filesystem's root dentry. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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