1 /* YAFFS: Yet another FFS. A NAND-flash specific file system.
3 * Copyright (C) 2002 Aleph One Ltd.
4 * for Toby Churchill Ltd and Brightstar Engineering
6 * Created by Charles Manning <charles@aleph1.co.uk>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
14 const char *yaffs_checkptrw_c_version =
15 "$Id: yaffs_checkptrw.c,v 1.11 2006-11-11 23:27:04 charles Exp $";
18 #include "yaffs_checkptrw.h"
21 static int yaffs_CheckpointSpaceOk(yaffs_Device *dev)
24 int blocksAvailable = dev->nErasedBlocks - dev->nReservedBlocks;
26 T(YAFFS_TRACE_CHECKPOINT,
27 (TSTR("checkpt blocks available = %d" TENDSTR),
31 return (blocksAvailable <= 0) ? 0 : 1;
36 static int yaffs_CheckpointErase(yaffs_Device *dev)
42 if(!dev->eraseBlockInNAND)
44 T(YAFFS_TRACE_CHECKPOINT,(TSTR("checking blocks %d to %d"TENDSTR),
45 dev->internalStartBlock,dev->internalEndBlock));
47 for(i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
48 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
49 if(bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT){
50 T(YAFFS_TRACE_CHECKPOINT,(TSTR("erasing checkpt block %d"TENDSTR),i));
51 if(dev->eraseBlockInNAND(dev,i- dev->blockOffset /* realign */)){
52 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
54 dev->nFreeChunks += dev->nChunksPerBlock;
57 dev->markNANDBlockBad(dev,i);
58 bi->blockState = YAFFS_BLOCK_STATE_DEAD;
63 dev->blocksInCheckpoint = 0;
69 static void yaffs_CheckpointFindNextErasedBlock(yaffs_Device *dev)
72 int blocksAvailable = dev->nErasedBlocks - dev->nReservedBlocks;
73 T(YAFFS_TRACE_CHECKPOINT,
74 (TSTR("allocating checkpt block: erased %d reserved %d avail %d next %d "TENDSTR),
75 dev->nErasedBlocks,dev->nReservedBlocks,blocksAvailable,dev->checkpointNextBlock));
77 if(dev->checkpointNextBlock >= 0 &&
78 dev->checkpointNextBlock <= dev->internalEndBlock &&
81 for(i = dev->checkpointNextBlock; i <= dev->internalEndBlock; i++){
82 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
83 if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY){
84 dev->checkpointNextBlock = i + 1;
85 dev->checkpointCurrentBlock = i;
86 T(YAFFS_TRACE_CHECKPOINT,(TSTR("allocating checkpt block %d"TENDSTR),i));
91 T(YAFFS_TRACE_CHECKPOINT,(TSTR("out of checkpt blocks"TENDSTR)));
93 dev->checkpointNextBlock = -1;
94 dev->checkpointCurrentBlock = -1;
97 static void yaffs_CheckpointFindNextCheckpointBlock(yaffs_Device *dev)
100 yaffs_ExtendedTags tags;
102 T(YAFFS_TRACE_CHECKPOINT,(TSTR("find next checkpt block: start: blocks %d next %d" TENDSTR),
103 dev->blocksInCheckpoint, dev->checkpointNextBlock));
105 if(dev->blocksInCheckpoint < dev->checkpointMaxBlocks)
106 for(i = dev->checkpointNextBlock; i <= dev->internalEndBlock; i++){
107 int chunk = i * dev->nChunksPerBlock;
108 int realignedChunk = chunk - dev->chunkOffset;
110 dev->readChunkWithTagsFromNAND(dev,realignedChunk,NULL,&tags);
111 T(YAFFS_TRACE_CHECKPOINT,(TSTR("find next checkpt block: search: block %d oid %d seq %d eccr %d" TENDSTR),
112 i, tags.objectId,tags.sequenceNumber,tags.eccResult));
114 if(tags.sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA){
115 /* Right kind of block */
116 dev->checkpointNextBlock = tags.objectId;
117 dev->checkpointCurrentBlock = i;
118 dev->checkpointBlockList[dev->blocksInCheckpoint] = i;
119 dev->blocksInCheckpoint++;
120 T(YAFFS_TRACE_CHECKPOINT,(TSTR("found checkpt block %d"TENDSTR),i));
125 T(YAFFS_TRACE_CHECKPOINT,(TSTR("found no more checkpt blocks"TENDSTR)));
127 dev->checkpointNextBlock = -1;
128 dev->checkpointCurrentBlock = -1;
132 int yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting)
135 /* Got the functions we need? */
136 if (!dev->writeChunkWithTagsToNAND ||
137 !dev->readChunkWithTagsFromNAND ||
138 !dev->eraseBlockInNAND ||
139 !dev->markNANDBlockBad)
142 if(forWriting && !yaffs_CheckpointSpaceOk(dev))
145 if(!dev->checkpointBuffer)
146 dev->checkpointBuffer = YMALLOC_DMA(dev->nDataBytesPerChunk);
147 if(!dev->checkpointBuffer)
151 dev->checkpointPageSequence = 0;
153 dev->checkpointOpenForWrite = forWriting;
155 dev->checkpointByteCount = 0;
156 dev->checkpointCurrentBlock = -1;
157 dev->checkpointCurrentChunk = -1;
158 dev->checkpointNextBlock = dev->internalStartBlock;
160 /* Erase all the blocks in the checkpoint area */
162 memset(dev->checkpointBuffer,0,dev->nDataBytesPerChunk);
163 dev->checkpointByteOffset = 0;
164 return yaffs_CheckpointErase(dev);
169 /* Set to a value that will kick off a read */
170 dev->checkpointByteOffset = dev->nDataBytesPerChunk;
171 /* A checkpoint block list of 1 checkpoint block per 16 block is (hopefully)
172 * going to be way more than we need */
173 dev->blocksInCheckpoint = 0;
174 dev->checkpointMaxBlocks = (dev->internalEndBlock - dev->internalStartBlock)/16 + 2;
175 dev->checkpointBlockList = YMALLOC(sizeof(int) * dev->checkpointMaxBlocks);
176 for(i = 0; i < dev->checkpointMaxBlocks; i++)
177 dev->checkpointBlockList[i] = -1;
183 static int yaffs_CheckpointFlushBuffer(yaffs_Device *dev)
189 yaffs_ExtendedTags tags;
191 if(dev->checkpointCurrentBlock < 0){
192 yaffs_CheckpointFindNextErasedBlock(dev);
193 dev->checkpointCurrentChunk = 0;
196 if(dev->checkpointCurrentBlock < 0)
199 tags.chunkDeleted = 0;
200 tags.objectId = dev->checkpointNextBlock; /* Hint to next place to look */
201 tags.chunkId = dev->checkpointPageSequence + 1;
202 tags.sequenceNumber = YAFFS_SEQUENCE_CHECKPOINT_DATA;
203 tags.byteCount = dev->nDataBytesPerChunk;
204 if(dev->checkpointCurrentChunk == 0){
205 /* First chunk we write for the block? Set block state to
207 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,dev->checkpointCurrentBlock);
208 bi->blockState = YAFFS_BLOCK_STATE_CHECKPOINT;
209 dev->blocksInCheckpoint++;
212 chunk = dev->checkpointCurrentBlock * dev->nChunksPerBlock + dev->checkpointCurrentChunk;
215 T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpoint wite buffer nand %d(%d:%d) objid %d chId %d" TENDSTR),
216 chunk, dev->checkpointCurrentBlock, dev->checkpointCurrentChunk,tags.objectId,tags.chunkId));
218 realignedChunk = chunk - dev->chunkOffset;
220 dev->writeChunkWithTagsToNAND(dev,realignedChunk,dev->checkpointBuffer,&tags);
221 dev->checkpointByteOffset = 0;
222 dev->checkpointPageSequence++;
223 dev->checkpointCurrentChunk++;
224 if(dev->checkpointCurrentChunk >= dev->nChunksPerBlock){
225 dev->checkpointCurrentChunk = 0;
226 dev->checkpointCurrentBlock = -1;
228 memset(dev->checkpointBuffer,0,dev->nDataBytesPerChunk);
234 int yaffs_CheckpointWrite(yaffs_Device *dev,const void *data, int nBytes)
240 __u8 * dataBytes = (__u8 *)data;
244 if(!dev->checkpointBuffer)
247 while(i < nBytes && ok) {
251 dev->checkpointBuffer[dev->checkpointByteOffset] = *dataBytes ;
252 dev->checkpointByteOffset++;
255 dev->checkpointByteCount++;
258 if(dev->checkpointByteOffset < 0 ||
259 dev->checkpointByteOffset >= dev->nDataBytesPerChunk)
260 ok = yaffs_CheckpointFlushBuffer(dev);
267 int yaffs_CheckpointRead(yaffs_Device *dev, void *data, int nBytes)
271 yaffs_ExtendedTags tags;
277 __u8 *dataBytes = (__u8 *)data;
279 if(!dev->checkpointBuffer)
282 while(i < nBytes && ok) {
285 if(dev->checkpointByteOffset < 0 ||
286 dev->checkpointByteOffset >= dev->nDataBytesPerChunk) {
288 if(dev->checkpointCurrentBlock < 0){
289 yaffs_CheckpointFindNextCheckpointBlock(dev);
290 dev->checkpointCurrentChunk = 0;
293 if(dev->checkpointCurrentBlock < 0)
297 chunk = dev->checkpointCurrentBlock * dev->nChunksPerBlock +
298 dev->checkpointCurrentChunk;
300 realignedChunk = chunk - dev->chunkOffset;
302 /* read in the next chunk */
303 /* printf("read checkpoint page %d\n",dev->checkpointPage); */
304 dev->readChunkWithTagsFromNAND(dev, realignedChunk,
305 dev->checkpointBuffer,
308 if(tags.chunkId != (dev->checkpointPageSequence + 1) ||
309 tags.sequenceNumber != YAFFS_SEQUENCE_CHECKPOINT_DATA)
312 dev->checkpointByteOffset = 0;
313 dev->checkpointPageSequence++;
314 dev->checkpointCurrentChunk++;
316 if(dev->checkpointCurrentChunk >= dev->nChunksPerBlock)
317 dev->checkpointCurrentBlock = -1;
322 *dataBytes = dev->checkpointBuffer[dev->checkpointByteOffset];
323 dev->checkpointByteOffset++;
326 dev->checkpointByteCount++;
333 int yaffs_CheckpointClose(yaffs_Device *dev)
336 if(dev->checkpointOpenForWrite){
337 if(dev->checkpointByteOffset != 0)
338 yaffs_CheckpointFlushBuffer(dev);
341 for(i = 0; i < dev->blocksInCheckpoint && dev->checkpointBlockList[i] >= 0; i++){
342 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,dev->checkpointBlockList[i]);
343 if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY)
344 bi->blockState = YAFFS_BLOCK_STATE_CHECKPOINT;
346 // Todo this looks odd...
349 YFREE(dev->checkpointBlockList);
350 dev->checkpointBlockList = NULL;
353 dev->nFreeChunks -= dev->blocksInCheckpoint * dev->nChunksPerBlock;
354 dev->nErasedBlocks -= dev->blocksInCheckpoint;
357 T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpoint byte count %d" TENDSTR),
358 dev->checkpointByteCount));
360 if(dev->checkpointBuffer){
361 /* free the buffer */
362 YFREE(dev->checkpointBuffer);
363 dev->checkpointBuffer = NULL;
371 int yaffs_CheckpointInvalidateStream(yaffs_Device *dev)
373 /* Erase the first checksum block */
375 T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpoint invalidate"TENDSTR)));
377 if(!yaffs_CheckpointSpaceOk(dev))
380 return yaffs_CheckpointErase(dev);