Fix length of buffer copied in __nfs4_get_acl_uncached

_copy_from_pages() used to copy data from the temporary buffer to the
user passed buffer is passed the wrong size parameter when copying
data. res.acl_len contains both the bitmap and acl lenghts while
acl_len contains the acl length after adjusting for the bitmap size.

Signed-off-by: Sachin Prabhu <sprabhu@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
			      struct nfs_fsinfo *info)
{
	int i, len, status = 0;
	rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];

	len = gss_mech_list_pseudoflavors(&flav_array[0]);
	flav_array[len] = RPC_AUTH_NULL;
	len += 1;

	for (i = 0; i < len; i++) {
		status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
		if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
			continue;
		break;
	}
	/*
	 * -EACCESS could mean that the user doesn't have correct permissions
	 * to access the mount.  It could also mean that we tried to mount
	 * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
	 * existing mount programs don't handle -EACCES very well so it should
	 * be mapped to -EPERM instead.
	 */
	if (status == -EACCES)
		status = -EPERM;
	return status;
}

static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
			      struct nfs_fsinfo *info)
{
	int i, len, status = 0;
	rpc_authflavor_t flav_array[NFS_MAX_SECFLAVORS];

	len = gss_mech_list_pseudoflavors(&flav_array[0]);
	flav_array[len] = RPC_AUTH_NULL;
	len += 1;

	for (i = 0; i < len; i++) {
		status = nfs4_lookup_root_sec(server, fhandle, info, flav_array[i]);
		if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
			continue;
		break;
	}
	/*
	 * -EACCESS could mean that the user doesn't have correct permissions
	 * to access the mount.  It could also mean that we tried to mount
	 * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
	 * existing mount programs don't handle -EACCES very well so it should
	 * be mapped to -EPERM instead.
	 */
	if (status == -EACCES)
		status = -EPERM;
	return status;
}
