zfsgetfdcnt.c

zilog的实时操作系统RZK,可以移植到多种处理器上

/*
 * File       : ZFSGetFDCnt.c
 * Description: This file contains the implementation of ZFS APIs
 * 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 * This file contains unpublished confidential and proprietary information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: ZFSGetDirFileCount
//Description: This API will return the number of files/directories present in the given directory path
INT32 ZFSGetDirFileCount( IN INT8 *dir_path )
{
	
	UINT off = 0 ;
	UINT len = 0 ;
	INT32 fd_count ;
	PZFS_DIR_LIST_t pdir_node, pcwd_dir_node ;
	PZFS_VOL_INFO_t pvol_info ;
	UINT8 status ;

	
	// if ZFS is not initialized, return error
	if( !IsZFSInited() )
		return ZFSERR_NOT_INITIALIZED ;

	if( dir_path == NULL )
		return ZFSERR_INVALID_ARGUMENTS ;

	// now check the validity of the dir path given in the argument
	if( !ValidatePath( dir_path ) )
		return ZFSERR_INVALID_FILEDIR_PATH ;

	// get the length of the directory
	len = strlen( (const INT8 *)dir_path ) ;
	// disable preemption
	RZKAcquireSemaphore(hSem_FS,INFINITE_SUSPEND);
//	preempt_status = DisablePreemption() ;

	if( GetCwdInfoForCurThread( &pvol_info, &pcwd_dir_node )  != ZFS_TRUE )
		{
		RZKReleaseSemaphore(hSem_FS);
//		EnablePreemption( preempt_status ) ;
		return ZFSERR_INVALID_VOLUME ;
		}

	// now validated, disable preemption, find the absolute path 
	status = IsAbsPath( dir_path, &pvol_info, &off, &pdir_node ) ;
	if( status != ZFS_TRUE )
		{
		RZKReleaseSemaphore(hSem_FS);
//		EnablePreemption( preempt_status ) ;
		return ZFSERR_INVALID_FILEDIR_PATH ;
		}

	if( !IsVolumeValid(pvol_info) )
		{
		RZKReleaseSemaphore(hSem_FS);
//		EnablePreemption( preempt_status ) ;
		return ZFSERR_INVALID_VOLUME ;
		}
	
	if( pdir_node == NULL )
		{
		// this is relative path, get the directory node of the relative path
		// get the CWD_INFO table
		pdir_node = pcwd_dir_node ;
		}
	
	pdir_node = GetNodeForPath( pdir_node, dir_path + off, (len - off ) ) ;
	if( pdir_node == NULL )
		{
		RZKReleaseSemaphore(hSem_FS);
//		EnablePreemption( preempt_status ) ;
		return ZFSERR_INVALID_FILEDIR_PATH ;
		}

	// node is found, just update the cwd info into the CWD_INFO structure
	fd_count = pdir_node->fd_cnt ;

	RZKReleaseSemaphore(hSem_FS);
//	EnablePreemption( preempt_status ) ;

	return fd_count ;
}