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 1.10 2006-11-10 02:51:10 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)){
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;
109 dev->readChunkWithTagsFromNAND(dev,chunk,NULL,&tags);
110 T(YAFFS_TRACE_CHECKPOINT,(TSTR("find next checkpt block: search: block %d oid %d seq %d eccr %d" TENDSTR),
111 i, tags.objectId,tags.sequenceNumber,tags.eccResult));
113 if(tags.sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA){
114 /* Right kind of block */
115 dev->checkpointNextBlock = tags.objectId;
116 dev->checkpointCurrentBlock = i;
117 dev->checkpointBlockList[dev->blocksInCheckpoint] = i;
118 dev->blocksInCheckpoint++;
119 T(YAFFS_TRACE_CHECKPOINT,(TSTR("found checkpt block %d"TENDSTR),i));
124 T(YAFFS_TRACE_CHECKPOINT,(TSTR("found no more checkpt blocks"TENDSTR)));
126 dev->checkpointNextBlock = -1;
127 dev->checkpointCurrentBlock = -1;
131 int yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting)
134 /* Got the functions we need? */
135 if (!dev->writeChunkWithTagsToNAND ||
136 !dev->readChunkWithTagsFromNAND ||
137 !dev->eraseBlockInNAND ||
138 !dev->markNANDBlockBad)
141 if(forWriting && !yaffs_CheckpointSpaceOk(dev))
144 if(!dev->checkpointBuffer)
145 dev->checkpointBuffer = YMALLOC_DMA(dev->nDataBytesPerChunk);
146 if(!dev->checkpointBuffer)
150 dev->checkpointPageSequence = 0;
152 dev->checkpointOpenForWrite = forWriting;
154 dev->checkpointByteCount = 0;
155 dev->checkpointCurrentBlock = -1;
156 dev->checkpointCurrentChunk = -1;
157 dev->checkpointNextBlock = dev->internalStartBlock;
159 /* Erase all the blocks in the checkpoint area */
161 memset(dev->checkpointBuffer,0,dev->nDataBytesPerChunk);
162 dev->checkpointByteOffset = 0;
163 return yaffs_CheckpointErase(dev);
168 /* Set to a value that will kick off a read */
169 dev->checkpointByteOffset = dev->nDataBytesPerChunk;
170 /* A checkpoint block list of 1 checkpoint block per 16 block is (hopefully)
171 * going to be way more than we need */
172 dev->blocksInCheckpoint = 0;
173 dev->checkpointMaxBlocks = (dev->internalEndBlock - dev->internalStartBlock)/16 + 2;
174 dev->checkpointBlockList = YMALLOC(sizeof(int) * dev->checkpointMaxBlocks);
175 for(i = 0; i < dev->checkpointMaxBlocks; i++)
176 dev->checkpointBlockList[i] = -1;
182 static int yaffs_CheckpointFlushBuffer(yaffs_Device *dev)
187 yaffs_ExtendedTags tags;
189 if(dev->checkpointCurrentBlock < 0){
190 yaffs_CheckpointFindNextErasedBlock(dev);
191 dev->checkpointCurrentChunk = 0;
194 if(dev->checkpointCurrentBlock < 0)
197 tags.chunkDeleted = 0;
198 tags.objectId = dev->checkpointNextBlock; /* Hint to next place to look */
199 tags.chunkId = dev->checkpointPageSequence + 1;
200 tags.sequenceNumber = YAFFS_SEQUENCE_CHECKPOINT_DATA;
201 tags.byteCount = dev->nDataBytesPerChunk;
202 if(dev->checkpointCurrentChunk == 0){
203 /* First chunk we write for the block? Set block state to
205 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,dev->checkpointCurrentBlock);
206 bi->blockState = YAFFS_BLOCK_STATE_CHECKPOINT;
207 dev->blocksInCheckpoint++;
210 chunk = dev->checkpointCurrentBlock * dev->nChunksPerBlock + dev->checkpointCurrentChunk;
212 T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpoint wite buffer nand %d(%d:%d) objid %d chId %d" TENDSTR),
213 chunk, dev->checkpointCurrentBlock, dev->checkpointCurrentChunk,tags.objectId,tags.chunkId));
215 dev->writeChunkWithTagsToNAND(dev,chunk,dev->checkpointBuffer,&tags);
216 dev->checkpointByteOffset = 0;
217 dev->checkpointPageSequence++;
218 dev->checkpointCurrentChunk++;
219 if(dev->checkpointCurrentChunk >= dev->nChunksPerBlock){
220 dev->checkpointCurrentChunk = 0;
221 dev->checkpointCurrentBlock = -1;
223 memset(dev->checkpointBuffer,0,dev->nDataBytesPerChunk);
229 int yaffs_CheckpointWrite(yaffs_Device *dev,const void *data, int nBytes)
235 __u8 * dataBytes = (__u8 *)data;
239 if(!dev->checkpointBuffer)
242 while(i < nBytes && ok) {
246 dev->checkpointBuffer[dev->checkpointByteOffset] = *dataBytes ;
247 dev->checkpointByteOffset++;
250 dev->checkpointByteCount++;
253 if(dev->checkpointByteOffset < 0 ||
254 dev->checkpointByteOffset >= dev->nDataBytesPerChunk)
255 ok = yaffs_CheckpointFlushBuffer(dev);
262 int yaffs_CheckpointRead(yaffs_Device *dev, void *data, int nBytes)
266 yaffs_ExtendedTags tags;
271 __u8 *dataBytes = (__u8 *)data;
273 if(!dev->checkpointBuffer)
276 while(i < nBytes && ok) {
279 if(dev->checkpointByteOffset < 0 ||
280 dev->checkpointByteOffset >= dev->nDataBytesPerChunk) {
282 if(dev->checkpointCurrentBlock < 0){
283 yaffs_CheckpointFindNextCheckpointBlock(dev);
284 dev->checkpointCurrentChunk = 0;
287 if(dev->checkpointCurrentBlock < 0)
291 chunk = dev->checkpointCurrentBlock * dev->nChunksPerBlock +
292 dev->checkpointCurrentChunk;
294 /* read in the next chunk */
295 /* printf("read checkpoint page %d\n",dev->checkpointPage); */
296 dev->readChunkWithTagsFromNAND(dev, chunk,
297 dev->checkpointBuffer,
300 if(tags.chunkId != (dev->checkpointPageSequence + 1) ||
301 tags.sequenceNumber != YAFFS_SEQUENCE_CHECKPOINT_DATA)
304 dev->checkpointByteOffset = 0;
305 dev->checkpointPageSequence++;
306 dev->checkpointCurrentChunk++;
308 if(dev->checkpointCurrentChunk >= dev->nChunksPerBlock)
309 dev->checkpointCurrentBlock = -1;
314 *dataBytes = dev->checkpointBuffer[dev->checkpointByteOffset];
315 dev->checkpointByteOffset++;
318 dev->checkpointByteCount++;
325 int yaffs_CheckpointClose(yaffs_Device *dev)
328 if(dev->checkpointOpenForWrite){
329 if(dev->checkpointByteOffset != 0)
330 yaffs_CheckpointFlushBuffer(dev);
333 for(i = 0; i < dev->blocksInCheckpoint && dev->checkpointBlockList[i] >= 0; i++){
334 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,dev->checkpointBlockList[i]);
335 if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY)
336 bi->blockState = YAFFS_BLOCK_STATE_CHECKPOINT;
338 // Todo this looks odd...
341 YFREE(dev->checkpointBlockList);
342 dev->checkpointBlockList = NULL;
345 dev->nFreeChunks -= dev->blocksInCheckpoint * dev->nChunksPerBlock;
346 dev->nErasedBlocks -= dev->blocksInCheckpoint;
349 T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpoint byte count %d" TENDSTR),
350 dev->checkpointByteCount));
352 if(dev->checkpointBuffer){
353 /* free the buffer */
354 YFREE(dev->checkpointBuffer);
355 dev->checkpointBuffer = NULL;
363 int yaffs_CheckpointInvalidateStream(yaffs_Device *dev)
365 /* Erase the first checksum block */
367 T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpoint invalidate"TENDSTR)));
369 if(!yaffs_CheckpointSpaceOk(dev))
372 return yaffs_CheckpointErase(dev);