block.c

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/*****************************************************************************************
 Copyright (c) 2002 The UbixOS Project
 All rights reserved.
 
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contributors may be used to endorse or promote products derived from this software
without specific prior written permission.
 
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 $Log: block.c,v $
 Revision 1.2  2006/12/05 14:10:21  reddawg
 Workign Distro
 
 Revision 1.1.1.1  2006/06/01 12:46:17  reddawg
 ubix2
 
 Revision 1.2  2005/10/12 00:13:37  reddawg
 Removed
 
 Revision 1.1.1.1  2005/09/26 17:24:39  reddawg
 no message
 
 Revision 1.6  2004/08/14 11:23:02  reddawg
 Changes
 
 Revision 1.5  2004/07/23 09:10:06  reddawg
 ubixfs: cleaned up some functions played with the caching a bit
 vfs:    renamed a bunch of functions
 cleaned up a few misc bugs
 
 Revision 1.4  2004/06/04 10:19:42  reddawg
 notes: we compile again, thank g-d anyways i was about to cry
 
 Revision 1.3  2004/05/19 15:20:06  reddawg
 Fixed reference problems due to changes in drive subsystem
 
 Revision 1.2  2004/04/28 02:22:55  reddawg
 This is a fiarly large commit but we are starting to use new driver model
 all around
 
 Revision 1.1.1.1  2004/04/15 12:07:07  reddawg
 UbixOS v1.0
 
 Revision 1.3  2004/04/13 16:36:34  reddawg
 Changed our copyright, it is all now under a BSD-Style license
 
 
 
 $Id: block.c 54 2016-01-11 01:29:55Z reddawg $
 
*****************************************************************************************/
 
#include <ubixfs/ubixfs.h>
#include <vfs/file.h>
#include <vfs/mount.h>
 
 
void syncBat(struct vfs_mountPoint *mp) {
  struct ubixFSInfo *fsInfo = mp->fsInfo;
  mp->device->devInfo->write(mp->device->devInfo->info,fsInfo->blockAllocationTable,mp->diskLabel->partitions[mp->partition].pOffset,mp->diskLabel->partitions[mp->partition].pBatSize);
  }
 
int freeBlocks(int block,fileDescriptor_t *fd) {
  int i = block;
  
  struct ubixFSInfo *fsInfo = fd->mp->fsInfo;
 
  while (i != 0x0) {
    block = fsInfo->blockAllocationTable[i].nextBlock;
        
    fsInfo->blockAllocationTable[i].attributes = 0x0;
    fsInfo->blockAllocationTable[i].nextBlock  = 0x0;
    
    i = block;
    }
  syncBat(fd->mp);
  return(i);
  }
  
int getFreeBlocks(int count,fileDescriptor_t *fd) {
  uInt32 i = 0x0;
  uInt32 x = 0x0;
  
  struct ubixFSInfo *fsInfo = fd->mp->fsInfo;
 
  getBlocks:
  for (i=1;i < fsInfo->batEntries;i++) {
    if (fsInfo->blockAllocationTable[i].attributes == 0x0) {
      for (x = 1; x < (uInt32)count; x++) {
        if (fsInfo->blockAllocationTable[i + x].attributes != 0x0) {
          goto getBlocks;
          }
        }
      for (x = i; x < i+count;x++) {
        fsInfo->blockAllocationTable[x].attributes = 0x1;
        if ((x+1) == (i+count)) {
          fsInfo->blockAllocationTable[x].nextBlock = -1;
          }
        else {
          fsInfo->blockAllocationTable[x].nextBlock  = x+1;
          }
        }
      syncBat(fd->mp);
      return(i);
      }
    }
  return(0x0);
  }
 
/***
 END
 ***/