zfsshutdown.c

zilog的实时操作系统RZK,可以移植到多种处理器上

/*
 * File       : ZFSShutdown.c
 * Description: This file contains the implementation of ZFSShutdown API
 * Author     : Mahadev K C
 * Created on : 30-APR-2003
 *
 * Copyright 2004 ZiLOG Inc.  ALL RIGHTS RESERVED.
 *
 * This file contains unpublished confidential and proprietary information
 * of ZiLOG, Inc.
 * NO PART OF THIS WORK MAY BE DUPLICATED, STORED, PUBLISHED OR DISCLOSED 
 * IN ANY FORM WITHOUT THE PRIOR WRITTEN CONSENT OF ZiLOG, INC.
 * This is not a license and no use of any kind of this work is authorized
 * in the absence of a written license granted by ZiLOG, Inc. in ZiLOG's 
 * sole discretion 
 */


#include "ZSysgen.h"
#include "ZTypes.h"
#include "ZThread.h"
#include "ZSemaphore.h"
#include "glextern.h"
extern RZK_SEMAPHOREHANDLE_t hSem_FS;

//Function Name: ZFSShutdown
//Decription: This API shuts down the ZFS.
// the arguments
ZFS_STATUS_t ZFSShutdown( void )
{

	UINT cnt = 0 ;
	// if already shutdown, return error.
	if( !IsZFSInited())
		return ZFSERR_ALREADY_SHUTDOWN ;

	// check whether any operation is taking place by checking the OR entry.
	RZKAcquireSemaphore(hSem_FS,INFINITE_SUSPEND);
//	preempt_status = DisablePreemption();

	for(cnt = 0 ; cnt < g_max_or_entries; cnt++ )
		{
		if( g_zfs_or[cnt].status == ZFS_OR_MAGIC_NUM )
			{
			// some operation is taking place, just return an error.
			RZKReleaseSemaphore(hSem_FS);
//			EnablePreemption(preempt_status);
			return ZFSERR_FS_BUSY ;
			}
		}

	// close the drivers
	for( cnt = 0 ; cnt < g_max_volumes ; cnt++ )
		{
		g_zfs_cfg[cnt].pfn_drv_close() ;
		}
	
	// now shutdown the file system.
	g_zfs_init = ZFS_FALSE ;

	//TBD - minor
	// write the TB' blk header to write grace shutdown of the system for both internal as well external flash.	

	RZKReleaseSemaphore(hSem_FS);
//	EnablePreemption(preempt_status);
	return ZFSERR_SUCCESS ;
}