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    Subject[123/197] fix NFS4 handling of mountpoint stat
    2.6.32-stable review patch.  If anyone has any objections, please let us know.

    ------------------

    From: Al Viro <viro@zeniv.linux.org.uk>

    commit 462d60577a997aa87c935ae4521bd303733a9f2b upstream.

    RFC says we need to follow the chain of mounts if there's more
    than one stacked on that point.

    Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

    ---
    fs/nfsd/nfs4xdr.c | 12 +++++++++---
    1 file changed, 9 insertions(+), 3 deletions(-)

    --- a/fs/nfsd/nfs4xdr.c
    +++ b/fs/nfsd/nfs4xdr.c
    @@ -2129,9 +2129,15 @@ out_acl:
    * and this is the root of a cross-mounted filesystem.
    */
    if (ignore_crossmnt == 0 &&
    - exp->ex_path.mnt->mnt_root->d_inode == dentry->d_inode) {
    - err = vfs_getattr(exp->ex_path.mnt->mnt_parent,
    - exp->ex_path.mnt->mnt_mountpoint, &stat);
    + dentry == exp->ex_path.mnt->mnt_root) {
    + struct path path = exp->ex_path;
    + path_get(&path);
    + while (follow_up(&path)) {
    + if (path.dentry != path.mnt->mnt_root)
    + break;
    + }
    + err = vfs_getattr(path.mnt, path.dentry, &stat);
    + path_put(&path);
    if (err)
    goto out_nfserr;
    }



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