Eric Lee / smarc-uboot

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fs/yaffs2/yaffs_bitmap.c 2.34 KB
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753ac6108   Charles Manning   u-boot: Update ya... 
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  /*
   * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   *
   * Copyright (C) 2002-2011 Aleph One Ltd.
   *   for Toby Churchill Ltd and Brightstar Engineering
   *
   * Created by Charles Manning <charles@aleph1.co.uk>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  
  #include "yaffs_bitmap.h"
  #include "yaffs_trace.h"
  /*
   * Chunk bitmap manipulations
   */
  
  static inline u8 *yaffs_block_bits(struct yaffs_dev *dev, int blk)
  {
  	if (blk < dev->internal_start_block || blk > dev->internal_end_block) {
  		yaffs_trace(YAFFS_TRACE_ERROR,
  			"BlockBits block %d is not valid",
  			blk);
  		BUG();
  	}
  	return dev->chunk_bits +
  	    (dev->chunk_bit_stride * (blk - dev->internal_start_block));
  }
  
  void yaffs_verify_chunk_bit_id(struct yaffs_dev *dev, int blk, int chunk)
  {
  	if (blk < dev->internal_start_block || blk > dev->internal_end_block ||
  	    chunk < 0 || chunk >= dev->param.chunks_per_block) {
  		yaffs_trace(YAFFS_TRACE_ERROR,
  			"Chunk Id (%d:%d) invalid",
  			blk, chunk);
  		BUG();
  	}
  }
  
  void yaffs_clear_chunk_bits(struct yaffs_dev *dev, int blk)
  {
  	u8 *blk_bits = yaffs_block_bits(dev, blk);
  
  	memset(blk_bits, 0, dev->chunk_bit_stride);
  }
  
  void yaffs_clear_chunk_bit(struct yaffs_dev *dev, int blk, int chunk)
  {
  	u8 *blk_bits = yaffs_block_bits(dev, blk);
  
  	yaffs_verify_chunk_bit_id(dev, blk, chunk);
  	blk_bits[chunk / 8] &= ~(1 << (chunk & 7));
  }
  
  void yaffs_set_chunk_bit(struct yaffs_dev *dev, int blk, int chunk)
  {
  	u8 *blk_bits = yaffs_block_bits(dev, blk);
  
  	yaffs_verify_chunk_bit_id(dev, blk, chunk);
  	blk_bits[chunk / 8] |= (1 << (chunk & 7));
  }
  
  int yaffs_check_chunk_bit(struct yaffs_dev *dev, int blk, int chunk)
  {
  	u8 *blk_bits = yaffs_block_bits(dev, blk);
  
  	yaffs_verify_chunk_bit_id(dev, blk, chunk);
  	return (blk_bits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
  }
  
  int yaffs_still_some_chunks(struct yaffs_dev *dev, int blk)
  {
  	u8 *blk_bits = yaffs_block_bits(dev, blk);
  	int i;
  
  	for (i = 0; i < dev->chunk_bit_stride; i++) {
  		if (*blk_bits)
  			return 1;
  		blk_bits++;
  	}
  	return 0;
  }
  
  int yaffs_count_chunk_bits(struct yaffs_dev *dev, int blk)
  {
  	u8 *blk_bits = yaffs_block_bits(dev, blk);
  	int i;
  	int n = 0;
  
  	for (i = 0; i < dev->chunk_bit_stride; i++, blk_bits++)
  		n += hweight8(*blk_bits);
  
  	return n;
  }