2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2007 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.
15 const char *yaffs_checkptrw_c_version =
16 "$Id: yaffs_checkptrw.c,v 1.12 2007-02-12 16:55:25 wookey Exp $";
19 #include "yaffs_checkptrw.h"
22 static int yaffs_CheckpointSpaceOk(yaffs_Device *dev)
25 int blocksAvailable = dev->nErasedBlocks - dev->nReservedBlocks;
27 T(YAFFS_TRACE_CHECKPOINT,
28 (TSTR("checkpt blocks available = %d" TENDSTR),
32 return (blocksAvailable <= 0) ? 0 : 1;
37 static int yaffs_CheckpointErase(yaffs_Device *dev)
43 if(!dev->eraseBlockInNAND)
45 T(YAFFS_TRACE_CHECKPOINT,(TSTR("checking blocks %d to %d"TENDSTR),
46 dev->internalStartBlock,dev->internalEndBlock));
48 for(i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
49 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
50 if(bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT){
51 T(YAFFS_TRACE_CHECKPOINT,(TSTR("erasing checkpt block %d"TENDSTR),i));
52 if(dev->eraseBlockInNAND(dev,i- dev->blockOffset /* realign */)){
53 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
55 dev->nFreeChunks += dev->nChunksPerBlock;
58 dev->markNANDBlockBad(dev,i);
59 bi->blockState = YAFFS_BLOCK_STATE_DEAD;
64 dev->blocksInCheckpoint = 0;
70 static void yaffs_CheckpointFindNextErasedBlock(yaffs_Device *dev)
73 int blocksAvailable = dev->nErasedBlocks - dev->nReservedBlocks;
74 T(YAFFS_TRACE_CHECKPOINT,
75 (TSTR("allocating checkpt block: erased %d reserved %d avail %d next %d "TENDSTR),
76 dev->nErasedBlocks,dev->nReservedBlocks,blocksAvailable,dev->checkpointNextBlock));
78 if(dev->checkpointNextBlock >= 0 &&
79 dev->checkpointNextBlock <= dev->internalEndBlock &&
82 for(i = dev->checkpointNextBlock; i <= dev->internalEndBlock; i++){
83 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
84 if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY){
85 dev->checkpointNextBlock = i + 1;
86 dev->checkpointCurrentBlock = i;
87 T(YAFFS_TRACE_CHECKPOINT,(TSTR("allocating checkpt block %d"TENDSTR),i));
92 T(YAFFS_TRACE_CHECKPOINT,(TSTR("out of checkpt blocks"TENDSTR)));
94 dev->checkpointNextBlock = -1;
95 dev->checkpointCurrentBlock = -1;
98 static void yaffs_CheckpointFindNextCheckpointBlock(yaffs_Device *dev)
101 yaffs_ExtendedTags tags;
103 T(YAFFS_TRACE_CHECKPOINT,(TSTR("find next checkpt block: start: blocks %d next %d" TENDSTR),
104 dev->blocksInCheckpoint, dev->checkpointNextBlock));
106 if(dev->blocksInCheckpoint < dev->checkpointMaxBlocks)
107 for(i = dev->checkpointNextBlock; i <= dev->internalEndBlock; i++){
108 int chunk = i * dev->nChunksPerBlock;
109 int realignedChunk = chunk - dev->chunkOffset;
111 dev->readChunkWithTagsFromNAND(dev,realignedChunk,NULL,&tags);
112 T(YAFFS_TRACE_CHECKPOINT,(TSTR("find next checkpt block: search: block %d oid %d seq %d eccr %d" TENDSTR),
113 i, tags.objectId,tags.sequenceNumber,tags.eccResult));
115 if(tags.sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA){
116 /* Right kind of block */
117 dev->checkpointNextBlock = tags.objectId;
118 dev->checkpointCurrentBlock = i;
119 dev->checkpointBlockList[dev->blocksInCheckpoint] = i;
120 dev->blocksInCheckpoint++;
121 T(YAFFS_TRACE_CHECKPOINT,(TSTR("found checkpt block %d"TENDSTR),i));
126 T(YAFFS_TRACE_CHECKPOINT,(TSTR("found no more checkpt blocks"TENDSTR)));
128 dev->checkpointNextBlock = -1;
129 dev->checkpointCurrentBlock = -1;
133 int yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting)
136 /* Got the functions we need? */
137 if (!dev->writeChunkWithTagsToNAND ||
138 !dev->readChunkWithTagsFromNAND ||
139 !dev->eraseBlockInNAND ||
140 !dev->markNANDBlockBad)
143 if(forWriting && !yaffs_CheckpointSpaceOk(dev))
146 if(!dev->checkpointBuffer)
147 dev->checkpointBuffer = YMALLOC_DMA(dev->nDataBytesPerChunk);
148 if(!dev->checkpointBuffer)
152 dev->checkpointPageSequence = 0;
154 dev->checkpointOpenForWrite = forWriting;
156 dev->checkpointByteCount = 0;
157 dev->checkpointCurrentBlock = -1;
158 dev->checkpointCurrentChunk = -1;
159 dev->checkpointNextBlock = dev->internalStartBlock;
161 /* Erase all the blocks in the checkpoint area */
163 memset(dev->checkpointBuffer,0,dev->nDataBytesPerChunk);
164 dev->checkpointByteOffset = 0;
165 return yaffs_CheckpointErase(dev);
170 /* Set to a value that will kick off a read */
171 dev->checkpointByteOffset = dev->nDataBytesPerChunk;
172 /* A checkpoint block list of 1 checkpoint block per 16 block is (hopefully)
173 * going to be way more than we need */
174 dev->blocksInCheckpoint = 0;
175 dev->checkpointMaxBlocks = (dev->internalEndBlock - dev->internalStartBlock)/16 + 2;
176 dev->checkpointBlockList = YMALLOC(sizeof(int) * dev->checkpointMaxBlocks);
177 for(i = 0; i < dev->checkpointMaxBlocks; i++)
178 dev->checkpointBlockList[i] = -1;
184 static int yaffs_CheckpointFlushBuffer(yaffs_Device *dev)
190 yaffs_ExtendedTags tags;
192 if(dev->checkpointCurrentBlock < 0){
193 yaffs_CheckpointFindNextErasedBlock(dev);
194 dev->checkpointCurrentChunk = 0;
197 if(dev->checkpointCurrentBlock < 0)
200 tags.chunkDeleted = 0;
201 tags.objectId = dev->checkpointNextBlock; /* Hint to next place to look */
202 tags.chunkId = dev->checkpointPageSequence + 1;
203 tags.sequenceNumber = YAFFS_SEQUENCE_CHECKPOINT_DATA;
204 tags.byteCount = dev->nDataBytesPerChunk;
205 if(dev->checkpointCurrentChunk == 0){
206 /* First chunk we write for the block? Set block state to
208 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,dev->checkpointCurrentBlock);
209 bi->blockState = YAFFS_BLOCK_STATE_CHECKPOINT;
210 dev->blocksInCheckpoint++;
213 chunk = dev->checkpointCurrentBlock * dev->nChunksPerBlock + dev->checkpointCurrentChunk;
216 T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpoint wite buffer nand %d(%d:%d) objid %d chId %d" TENDSTR),
217 chunk, dev->checkpointCurrentBlock, dev->checkpointCurrentChunk,tags.objectId,tags.chunkId));
219 realignedChunk = chunk - dev->chunkOffset;
221 dev->writeChunkWithTagsToNAND(dev,realignedChunk,dev->checkpointBuffer,&tags);
222 dev->checkpointByteOffset = 0;
223 dev->checkpointPageSequence++;
224 dev->checkpointCurrentChunk++;
225 if(dev->checkpointCurrentChunk >= dev->nChunksPerBlock){
226 dev->checkpointCurrentChunk = 0;
227 dev->checkpointCurrentBlock = -1;
229 memset(dev->checkpointBuffer,0,dev->nDataBytesPerChunk);
235 int yaffs_CheckpointWrite(yaffs_Device *dev,const void *data, int nBytes)
241 __u8 * dataBytes = (__u8 *)data;
245 if(!dev->checkpointBuffer)
248 while(i < nBytes && ok) {
252 dev->checkpointBuffer[dev->checkpointByteOffset] = *dataBytes ;
253 dev->checkpointByteOffset++;
256 dev->checkpointByteCount++;
259 if(dev->checkpointByteOffset < 0 ||
260 dev->checkpointByteOffset >= dev->nDataBytesPerChunk)
261 ok = yaffs_CheckpointFlushBuffer(dev);
268 int yaffs_CheckpointRead(yaffs_Device *dev, void *data, int nBytes)
272 yaffs_ExtendedTags tags;
278 __u8 *dataBytes = (__u8 *)data;
280 if(!dev->checkpointBuffer)
283 while(i < nBytes && ok) {
286 if(dev->checkpointByteOffset < 0 ||
287 dev->checkpointByteOffset >= dev->nDataBytesPerChunk) {
289 if(dev->checkpointCurrentBlock < 0){
290 yaffs_CheckpointFindNextCheckpointBlock(dev);
291 dev->checkpointCurrentChunk = 0;
294 if(dev->checkpointCurrentBlock < 0)
298 chunk = dev->checkpointCurrentBlock * dev->nChunksPerBlock +
299 dev->checkpointCurrentChunk;
301 realignedChunk = chunk - dev->chunkOffset;
303 /* read in the next chunk */
304 /* printf("read checkpoint page %d\n",dev->checkpointPage); */
305 dev->readChunkWithTagsFromNAND(dev, realignedChunk,
306 dev->checkpointBuffer,
309 if(tags.chunkId != (dev->checkpointPageSequence + 1) ||
310 tags.sequenceNumber != YAFFS_SEQUENCE_CHECKPOINT_DATA)
313 dev->checkpointByteOffset = 0;
314 dev->checkpointPageSequence++;
315 dev->checkpointCurrentChunk++;
317 if(dev->checkpointCurrentChunk >= dev->nChunksPerBlock)
318 dev->checkpointCurrentBlock = -1;
323 *dataBytes = dev->checkpointBuffer[dev->checkpointByteOffset];
324 dev->checkpointByteOffset++;
327 dev->checkpointByteCount++;
334 int yaffs_CheckpointClose(yaffs_Device *dev)
337 if(dev->checkpointOpenForWrite){
338 if(dev->checkpointByteOffset != 0)
339 yaffs_CheckpointFlushBuffer(dev);
342 for(i = 0; i < dev->blocksInCheckpoint && dev->checkpointBlockList[i] >= 0; i++){
343 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,dev->checkpointBlockList[i]);
344 if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY)
345 bi->blockState = YAFFS_BLOCK_STATE_CHECKPOINT;
347 // Todo this looks odd...
350 YFREE(dev->checkpointBlockList);
351 dev->checkpointBlockList = NULL;
354 dev->nFreeChunks -= dev->blocksInCheckpoint * dev->nChunksPerBlock;
355 dev->nErasedBlocks -= dev->blocksInCheckpoint;
358 T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpoint byte count %d" TENDSTR),
359 dev->checkpointByteCount));
361 if(dev->checkpointBuffer){
362 /* free the buffer */
363 YFREE(dev->checkpointBuffer);
364 dev->checkpointBuffer = NULL;
372 int yaffs_CheckpointInvalidateStream(yaffs_Device *dev)
374 /* Erase the first checksum block */
376 T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpoint invalidate"TENDSTR)));
378 if(!yaffs_CheckpointSpaceOk(dev))
381 return yaffs_CheckpointErase(dev);