nsc_freeze.c revision fcf3ce441efd61da9bb2884968af01cb7c1452cc
d29b2c4438482eb00488be49a1f5d6835f455546ab/*
d29b2c4438482eb00488be49a1f5d6835f455546ab * CDDL HEADER START
d29b2c4438482eb00488be49a1f5d6835f455546ab *
d29b2c4438482eb00488be49a1f5d6835f455546ab * The contents of this file are subject to the terms of the
d29b2c4438482eb00488be49a1f5d6835f455546ab * Common Development and Distribution License (the "License").
d29b2c4438482eb00488be49a1f5d6835f455546ab * You may not use this file except in compliance with the License.
d29b2c4438482eb00488be49a1f5d6835f455546ab *
d29b2c4438482eb00488be49a1f5d6835f455546ab * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
d29b2c4438482eb00488be49a1f5d6835f455546ab * or http://www.opensolaris.org/os/licensing.
d29b2c4438482eb00488be49a1f5d6835f455546ab * See the License for the specific language governing permissions
d29b2c4438482eb00488be49a1f5d6835f455546ab * and limitations under the License.
d29b2c4438482eb00488be49a1f5d6835f455546ab *
d29b2c4438482eb00488be49a1f5d6835f455546ab * When distributing Covered Code, include this CDDL HEADER in each
d29b2c4438482eb00488be49a1f5d6835f455546ab * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
d29b2c4438482eb00488be49a1f5d6835f455546ab * If applicable, add the following below this CDDL HEADER, with the
d29b2c4438482eb00488be49a1f5d6835f455546ab * fields enclosed by brackets "[]" replaced with your own identifying
d29b2c4438482eb00488be49a1f5d6835f455546ab * information: Portions Copyright [yyyy] [name of copyright owner]
d29b2c4438482eb00488be49a1f5d6835f455546ab *
d29b2c4438482eb00488be49a1f5d6835f455546ab * CDDL HEADER END
d29b2c4438482eb00488be49a1f5d6835f455546ab */
d29b2c4438482eb00488be49a1f5d6835f455546ab/*
d29b2c4438482eb00488be49a1f5d6835f455546ab * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
4f680cc668fa6cf678c531083400ade9a9c7934cAli Bahrami * Use is subject to license terms.
d29b2c4438482eb00488be49a1f5d6835f455546ab */
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab#include <sys/types.h>
d29b2c4438482eb00488be49a1f5d6835f455546ab#include <sys/errno.h>
d29b2c4438482eb00488be49a1f5d6835f455546ab#include <sys/cmn_err.h>
d29b2c4438482eb00488be49a1f5d6835f455546ab#include <sys/ksynch.h>
d29b2c4438482eb00488be49a1f5d6835f455546ab#include <sys/kmem.h>
d29b2c4438482eb00488be49a1f5d6835f455546ab#include <sys/ddi.h>
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab#define __NSC_GEN__
d29b2c4438482eb00488be49a1f5d6835f455546ab#include "nsc_dev.h"
d29b2c4438482eb00488be49a1f5d6835f455546ab#include "../nsctl.h"
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab/*
d29b2c4438482eb00488be49a1f5d6835f455546ab * (Un)Freeze Module
d29b2c4438482eb00488be49a1f5d6835f455546ab *
d29b2c4438482eb00488be49a1f5d6835f455546ab * This module provides a means to 'freeze' a device and ensure
d29b2c4438482eb00488be49a1f5d6835f455546ab * that no SP software has an open reference to that device. Later
d29b2c4438482eb00488be49a1f5d6835f455546ab * the device can be 'unfrozen' and the SP software can resume
d29b2c4438482eb00488be49a1f5d6835f455546ab * normal operations.
d29b2c4438482eb00488be49a1f5d6835f455546ab *
d29b2c4438482eb00488be49a1f5d6835f455546ab * This module is required because it is possible to place a virtual
d29b2c4438482eb00488be49a1f5d6835f455546ab * volume driver (RAID-0, 1 or 5) into a state whereby it needs to be
d29b2c4438482eb00488be49a1f5d6835f455546ab * disabled for corrective action. The (un)freeze facility provides a
d29b2c4438482eb00488be49a1f5d6835f455546ab * method of doing this without downtime.
d29b2c4438482eb00488be49a1f5d6835f455546ab *
d29b2c4438482eb00488be49a1f5d6835f455546ab * A device that is frozen should be frozen on all nodes. It is the
d29b2c4438482eb00488be49a1f5d6835f455546ab * responsibility of the management software or the user to perform
d29b2c4438482eb00488be49a1f5d6835f455546ab * the freeze and unfreeze on the required nodes.
d29b2c4438482eb00488be49a1f5d6835f455546ab */
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546abextern nsc_mem_t *_nsc_local_mem;
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546abtypedef struct _nsc_frz_s {
d29b2c4438482eb00488be49a1f5d6835f455546ab struct _nsc_frz_s *next;
d29b2c4438482eb00488be49a1f5d6835f455546ab nsc_path_t *token;
d29b2c4438482eb00488be49a1f5d6835f455546ab char path[NSC_MAXPATH];
d29b2c4438482eb00488be49a1f5d6835f455546ab} _nsc_frz_t;
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546abextern int _nsc_frz_stop(char *, int *); /* forward decl */
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546abstatic _nsc_frz_t *_nsc_frz_top;
d29b2c4438482eb00488be49a1f5d6835f455546abstatic nsc_def_t _nsc_frz_def[];
d29b2c4438482eb00488be49a1f5d6835f455546abstatic kmutex_t _nsc_frz_sleep;
d29b2c4438482eb00488be49a1f5d6835f455546abstatic nsc_io_t *_nsc_frz_io;
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546abvoid
d29b2c4438482eb00488be49a1f5d6835f455546ab_nsc_init_frz(void)
d29b2c4438482eb00488be49a1f5d6835f455546ab{
d29b2c4438482eb00488be49a1f5d6835f455546ab mutex_init(&_nsc_frz_sleep, NULL, MUTEX_DRIVER, NULL);
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab _nsc_frz_io = nsc_register_io("frz",
d29b2c4438482eb00488be49a1f5d6835f455546ab NSC_FREEZE_ID | NSC_FILTER, _nsc_frz_def);
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab if (!_nsc_frz_io)
d29b2c4438482eb00488be49a1f5d6835f455546ab cmn_err(CE_WARN, "nsctl: _nsc_init_frz: register failed");
d29b2c4438482eb00488be49a1f5d6835f455546ab}
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546abvoid
d29b2c4438482eb00488be49a1f5d6835f455546ab_nsc_deinit_frz(void)
d29b2c4438482eb00488be49a1f5d6835f455546ab{
d29b2c4438482eb00488be49a1f5d6835f455546ab if (_nsc_frz_io)
d29b2c4438482eb00488be49a1f5d6835f455546ab (void) nsc_unregister_io(_nsc_frz_io, 0);
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab _nsc_frz_io = NULL;
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab mutex_destroy(&_nsc_frz_sleep);
d29b2c4438482eb00488be49a1f5d6835f455546ab}
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab/*
d29b2c4438482eb00488be49a1f5d6835f455546ab * int _nsc_frz_start(char *path, int *rvp)
d29b2c4438482eb00488be49a1f5d6835f455546ab * Freeze a device
d29b2c4438482eb00488be49a1f5d6835f455546ab *
d29b2c4438482eb00488be49a1f5d6835f455546ab * Calling/Exit State:
d29b2c4438482eb00488be49a1f5d6835f455546ab * Must be called from a context that can block.
d29b2c4438482eb00488be49a1f5d6835f455546ab * Returns 0 for success, or one of the following error codes:
d29b2c4438482eb00488be49a1f5d6835f455546ab * EINVAL - invalid 'path' argument
d29b2c4438482eb00488be49a1f5d6835f455546ab * ENOMEM - failed to allocate memory
d29b2c4438482eb00488be49a1f5d6835f455546ab * EALREADY - 'path' is already frozen
d29b2c4438482eb00488be49a1f5d6835f455546ab *
d29b2c4438482eb00488be49a1f5d6835f455546ab * Description:
d29b2c4438482eb00488be49a1f5d6835f455546ab * Registers 'path' to be accessed through the NSC_FREEZE_ID
d29b2c4438482eb00488be49a1f5d6835f455546ab * io module, and forces any open file descriptors for 'path'
d29b2c4438482eb00488be49a1f5d6835f455546ab * to be re-opened as appropriate.
d29b2c4438482eb00488be49a1f5d6835f455546ab */
d29b2c4438482eb00488be49a1f5d6835f455546abint
d29b2c4438482eb00488be49a1f5d6835f455546ab_nsc_frz_start(path, rvp)
d29b2c4438482eb00488be49a1f5d6835f455546abchar *path;
d29b2c4438482eb00488be49a1f5d6835f455546abint *rvp;
d29b2c4438482eb00488be49a1f5d6835f455546ab{
d29b2c4438482eb00488be49a1f5d6835f455546ab _nsc_frz_t *frz, *xfrz;
d29b2c4438482eb00488be49a1f5d6835f455546ab int rc;
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab *rvp = 0;
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab if (strlen(path) >= NSC_MAXPATH)
d29b2c4438482eb00488be49a1f5d6835f455546ab return (EINVAL);
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab frz = nsc_kmem_zalloc(sizeof (*frz), KM_SLEEP, _nsc_local_mem);
d29b2c4438482eb00488be49a1f5d6835f455546ab if (!frz)
d29b2c4438482eb00488be49a1f5d6835f455546ab return (ENOMEM);
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab (void) strcpy(frz->path, path);
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab mutex_enter(&_nsc_frz_sleep);
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab for (xfrz = _nsc_frz_top; xfrz; xfrz = xfrz->next)
d29b2c4438482eb00488be49a1f5d6835f455546ab if (strcmp(frz->path, xfrz->path) == 0)
d29b2c4438482eb00488be49a1f5d6835f455546ab break;
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab if (!xfrz) {
d29b2c4438482eb00488be49a1f5d6835f455546ab frz->next = _nsc_frz_top;
d29b2c4438482eb00488be49a1f5d6835f455546ab _nsc_frz_top = frz;
d29b2c4438482eb00488be49a1f5d6835f455546ab }
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab mutex_exit(&_nsc_frz_sleep);
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab if (xfrz) {
d29b2c4438482eb00488be49a1f5d6835f455546ab nsc_kmem_free(frz, sizeof (*frz));
d29b2c4438482eb00488be49a1f5d6835f455546ab return (EALREADY);
d29b2c4438482eb00488be49a1f5d6835f455546ab }
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab frz->token = nsc_register_path(path, NSC_DEVICE, _nsc_frz_io);
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab if (!frz->token) {
d29b2c4438482eb00488be49a1f5d6835f455546ab (void) _nsc_frz_stop(path, &rc);
d29b2c4438482eb00488be49a1f5d6835f455546ab return (EINVAL);
d29b2c4438482eb00488be49a1f5d6835f455546ab }
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab return (0);
d29b2c4438482eb00488be49a1f5d6835f455546ab}
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab/*
d29b2c4438482eb00488be49a1f5d6835f455546ab * int _nsc_frz_stop(char *path, int *rvp)
d29b2c4438482eb00488be49a1f5d6835f455546ab * Unfreeze a device
d29b2c4438482eb00488be49a1f5d6835f455546ab *
d29b2c4438482eb00488be49a1f5d6835f455546ab * Calling/Exit State:
d29b2c4438482eb00488be49a1f5d6835f455546ab * Must be called from a context that can block.
d29b2c4438482eb00488be49a1f5d6835f455546ab * Returns 0 or an error code.
d29b2c4438482eb00488be49a1f5d6835f455546ab *
d29b2c4438482eb00488be49a1f5d6835f455546ab * Description:
d29b2c4438482eb00488be49a1f5d6835f455546ab * Removes the path registration for the NSC_FREEZE_ID io module
d29b2c4438482eb00488be49a1f5d6835f455546ab * and forces any re-opens as appropriate.
d29b2c4438482eb00488be49a1f5d6835f455546ab */
d29b2c4438482eb00488be49a1f5d6835f455546abint
d29b2c4438482eb00488be49a1f5d6835f455546ab_nsc_frz_stop(path, rvp)
d29b2c4438482eb00488be49a1f5d6835f455546abchar *path;
d29b2c4438482eb00488be49a1f5d6835f455546abint *rvp;
d29b2c4438482eb00488be49a1f5d6835f455546ab{
d29b2c4438482eb00488be49a1f5d6835f455546ab _nsc_frz_t **xfrz, *frz = NULL;
d29b2c4438482eb00488be49a1f5d6835f455546ab int rc = 0;
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab *rvp = 0;
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab mutex_enter(&_nsc_frz_sleep);
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab for (xfrz = &_nsc_frz_top; *xfrz; xfrz = &(*xfrz)->next)
d29b2c4438482eb00488be49a1f5d6835f455546ab if (strcmp(path, (*xfrz)->path) == 0) {
d29b2c4438482eb00488be49a1f5d6835f455546ab frz = *xfrz;
d29b2c4438482eb00488be49a1f5d6835f455546ab break;
d29b2c4438482eb00488be49a1f5d6835f455546ab }
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab if (!frz) {
d29b2c4438482eb00488be49a1f5d6835f455546ab mutex_exit(&_nsc_frz_sleep);
d29b2c4438482eb00488be49a1f5d6835f455546ab return (EINVAL);
d29b2c4438482eb00488be49a1f5d6835f455546ab }
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab if (frz->token)
d29b2c4438482eb00488be49a1f5d6835f455546ab rc = nsc_unregister_path(frz->token, NSC_PCATCH);
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab if (rc) {
d29b2c4438482eb00488be49a1f5d6835f455546ab mutex_exit(&_nsc_frz_sleep);
d29b2c4438482eb00488be49a1f5d6835f455546ab return (rc);
d29b2c4438482eb00488be49a1f5d6835f455546ab }
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab (*xfrz) = frz->next;
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab mutex_exit(&_nsc_frz_sleep);
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab nsc_kmem_free(frz, sizeof (*frz));
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab return (0);
d29b2c4438482eb00488be49a1f5d6835f455546ab}
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab/*
d29b2c4438482eb00488be49a1f5d6835f455546ab * int _nsc_frz_isfrozen(char *path, int *rvp)
d29b2c4438482eb00488be49a1f5d6835f455546ab * Tests whether a device is frozen.
d29b2c4438482eb00488be49a1f5d6835f455546ab *
d29b2c4438482eb00488be49a1f5d6835f455546ab * Calling/Exit State:
d29b2c4438482eb00488be49a1f5d6835f455546ab * Returns 0 or EINVAL.
d29b2c4438482eb00488be49a1f5d6835f455546ab * Sets *rvp to 1 if the device was not frozen, and 0 otherwise.
d29b2c4438482eb00488be49a1f5d6835f455546ab * This function returns historical information.
d29b2c4438482eb00488be49a1f5d6835f455546ab */
d29b2c4438482eb00488be49a1f5d6835f455546abint
d29b2c4438482eb00488be49a1f5d6835f455546ab_nsc_frz_isfrozen(path, rvp)
d29b2c4438482eb00488be49a1f5d6835f455546abchar *path;
4f680cc668fa6cf678c531083400ade9a9c7934cAli Bahramiint *rvp;
4f680cc668fa6cf678c531083400ade9a9c7934cAli Bahrami{
4f680cc668fa6cf678c531083400ade9a9c7934cAli Bahrami _nsc_frz_t *frz;
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab *rvp = 1;
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab if (! _nsc_frz_io)
d29b2c4438482eb00488be49a1f5d6835f455546ab return (EINVAL);
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab mutex_enter(&_nsc_frz_sleep);
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab for (frz = _nsc_frz_top; frz; frz = frz->next)
d29b2c4438482eb00488be49a1f5d6835f455546ab if (strcmp(frz->path, path) == 0) {
d29b2c4438482eb00488be49a1f5d6835f455546ab *rvp = 0;
d29b2c4438482eb00488be49a1f5d6835f455546ab break;
4f680cc668fa6cf678c531083400ade9a9c7934cAli Bahrami }
4f680cc668fa6cf678c531083400ade9a9c7934cAli Bahrami
d29b2c4438482eb00488be49a1f5d6835f455546ab mutex_exit(&_nsc_frz_sleep);
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab return (0);
d29b2c4438482eb00488be49a1f5d6835f455546ab}
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab
4f680cc668fa6cf678c531083400ade9a9c7934cAli Bahrami/*
d29b2c4438482eb00488be49a1f5d6835f455546ab * static int
d29b2c4438482eb00488be49a1f5d6835f455546ab * _nsc_frz_open(char *path, int flag, blind_t *cdp)
d29b2c4438482eb00488be49a1f5d6835f455546ab * Dummy open function.
d29b2c4438482eb00488be49a1f5d6835f455546ab *
d29b2c4438482eb00488be49a1f5d6835f455546ab * Description:
d29b2c4438482eb00488be49a1f5d6835f455546ab * This is the "Open" function for the I/O module.
d29b2c4438482eb00488be49a1f5d6835f455546ab * It is just a dummy.
d29b2c4438482eb00488be49a1f5d6835f455546ab */
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab/* ARGSUSED */
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546abstatic int
d29b2c4438482eb00488be49a1f5d6835f455546ab_nsc_frz_open(path, flag, cdp)
d29b2c4438482eb00488be49a1f5d6835f455546abchar *path;
d29b2c4438482eb00488be49a1f5d6835f455546abint flag;
d29b2c4438482eb00488be49a1f5d6835f455546abblind_t *cdp;
d29b2c4438482eb00488be49a1f5d6835f455546ab{
d29b2c4438482eb00488be49a1f5d6835f455546ab *cdp = 0;
d29b2c4438482eb00488be49a1f5d6835f455546ab return (0);
d29b2c4438482eb00488be49a1f5d6835f455546ab}
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab/*
d29b2c4438482eb00488be49a1f5d6835f455546ab * static int
d29b2c4438482eb00488be49a1f5d6835f455546ab * _nsc_frz_close()
d29b2c4438482eb00488be49a1f5d6835f455546ab * Dummy close function.
d29b2c4438482eb00488be49a1f5d6835f455546ab *
d29b2c4438482eb00488be49a1f5d6835f455546ab * Description:
d29b2c4438482eb00488be49a1f5d6835f455546ab * This is the "Close" function for the I/O module.
d29b2c4438482eb00488be49a1f5d6835f455546ab * It is just a dummy.
d29b2c4438482eb00488be49a1f5d6835f455546ab */
d29b2c4438482eb00488be49a1f5d6835f455546abstatic int
d29b2c4438482eb00488be49a1f5d6835f455546ab_nsc_frz_close() { return (0); }
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab/*
d29b2c4438482eb00488be49a1f5d6835f455546ab * static int
d29b2c4438482eb00488be49a1f5d6835f455546ab * _nsc_frz_attach()
d29b2c4438482eb00488be49a1f5d6835f455546ab * Attach a device to this i/o module.
d29b2c4438482eb00488be49a1f5d6835f455546ab *
d29b2c4438482eb00488be49a1f5d6835f455546ab * Calling/Exit State:
d29b2c4438482eb00488be49a1f5d6835f455546ab * Returns EACCES in all cricumstances.
d29b2c4438482eb00488be49a1f5d6835f455546ab *
d29b2c4438482eb00488be49a1f5d6835f455546ab * Description:
d29b2c4438482eb00488be49a1f5d6835f455546ab * This function is called by the nsctl module when it wishes
d29b2c4438482eb00488be49a1f5d6835f455546ab * to attach the device to this I/O module (ie. as part of
d29b2c4438482eb00488be49a1f5d6835f455546ab * nsc_reserve() processing). This function unconditionally
d29b2c4438482eb00488be49a1f5d6835f455546ab * returns an error which forces the nsc_reserve() to fail, and
d29b2c4438482eb00488be49a1f5d6835f455546ab * so no access to possible to the underlying device.
d29b2c4438482eb00488be49a1f5d6835f455546ab */
d29b2c4438482eb00488be49a1f5d6835f455546abstatic int
d29b2c4438482eb00488be49a1f5d6835f455546ab_nsc_frz_attach() { return (EACCES); }
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546ab
d29b2c4438482eb00488be49a1f5d6835f455546abstatic nsc_def_t _nsc_frz_def[] = {
d29b2c4438482eb00488be49a1f5d6835f455546ab "Open", (uintptr_t)_nsc_frz_open, 0,
d29b2c4438482eb00488be49a1f5d6835f455546ab "Close", (uintptr_t)_nsc_frz_close, 0,
d29b2c4438482eb00488be49a1f5d6835f455546ab "Attach", (uintptr_t)_nsc_frz_attach, 0,
d29b2c4438482eb00488be49a1f5d6835f455546ab "Provide", 0, 0,
d29b2c4438482eb00488be49a1f5d6835f455546ab 0, 0, 0
d29b2c4438482eb00488be49a1f5d6835f455546ab};
d29b2c4438482eb00488be49a1f5d6835f455546ab