2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2010 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
7 * Created by Charles Manning <charles@aleph1.co.uk>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 #include "yaffs_bitmap.h"
15 #include "yaffs_trace.h"
17 * Chunk bitmap manipulations
20 static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device *dev, int blk)
22 if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
24 (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
28 return dev->chunkBits +
29 (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
32 void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
34 if (blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
35 chunk < 0 || chunk >= dev->param.nChunksPerBlock) {
37 (TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),
43 void yaffs_ClearChunkBits(yaffs_Device *dev, int blk)
45 __u8 *blkBits = yaffs_BlockBits(dev, blk);
47 memset(blkBits, 0, dev->chunkBitmapStride);
50 void yaffs_ClearChunkBit(yaffs_Device *dev, int blk, int chunk)
52 __u8 *blkBits = yaffs_BlockBits(dev, blk);
54 yaffs_VerifyChunkBitId(dev, blk, chunk);
56 blkBits[chunk / 8] &= ~(1 << (chunk & 7));
59 void yaffs_SetChunkBit(yaffs_Device *dev, int blk, int chunk)
61 __u8 *blkBits = yaffs_BlockBits(dev, blk);
63 yaffs_VerifyChunkBitId(dev, blk, chunk);
65 blkBits[chunk / 8] |= (1 << (chunk & 7));
68 int yaffs_CheckChunkBit(yaffs_Device *dev, int blk, int chunk)
70 __u8 *blkBits = yaffs_BlockBits(dev, blk);
71 yaffs_VerifyChunkBitId(dev, blk, chunk);
73 return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
76 int yaffs_StillSomeChunkBits(yaffs_Device *dev, int blk)
78 __u8 *blkBits = yaffs_BlockBits(dev, blk);
80 for (i = 0; i < dev->chunkBitmapStride; i++) {
88 int yaffs_CountChunkBits(yaffs_Device *dev, int blk)
90 __u8 *blkBits = yaffs_BlockBits(dev, blk);
93 for (i = 0; i < dev->chunkBitmapStride; i++) {