/fs/yaffs2/yaffs_checkptrw.c

https://github.com/jasonts/htc-kernel-msm7227-exp · C · 401 lines · 283 code · 93 blank · 25 comment · 60 complexity · ecfcc3db4ebcb7ed0e5a62e92eb628a3 MD5 · raw file 

    

  1. /*
    2. 

  2.  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
    3. 

  3.  *
    4. 

  4.  * Copyright (C) 2002-2010 Aleph One Ltd.
    5. 

  5.  *   for Toby Churchill Ltd and Brightstar Engineering
    6. 

  6.  *
    7. 

  7.  * Created by Charles Manning <charles@aleph1.co.uk>
    8. 

  8.  *
    9. 

  9.  * This program is free software; you can redistribute it and/or modify
    10. 

  10.  * it under the terms of the GNU General Public License version 2 as
    11. 

  11.  * published by the Free Software Foundation.
    12. 

  12.  */
    13. 

  13. 

  14. #include "yaffs_checkptrw.h"
    15. 

  15. #include "yaffs_getblockinfo.h"
    16. 

  16. 

  17. static int yaffs2_CheckpointSpaceOk(yaffs_Device *dev)
    18. 

  18. {
    19. 

  19. 	int blocksAvailable = dev->nErasedBlocks - dev->param.nReservedBlocks;
    20. 

  20. 

  21. 	T(YAFFS_TRACE_CHECKPOINT,
    22. 

  22. 		(TSTR("checkpt blocks available = %d" TENDSTR),
    23. 

  23. 		blocksAvailable));
    24. 

  24. 

  25. 	return (blocksAvailable <= 0) ? 0 : 1;
    26. 

  26. }
    27. 

  27. 

  28. 

  29. static int yaffs2_CheckpointErase(yaffs_Device *dev)
    30. 

  30. {
    31. 

  31. 	int i;
    32. 

  32. 

  33. 	if (!dev->param.eraseBlockInNAND)
    34. 

  34. 		return 0;
    35. 

  35. 	T(YAFFS_TRACE_CHECKPOINT, (TSTR("checking blocks %d to %d"TENDSTR),
    36. 

  36. 		dev->internalStartBlock, dev->internalEndBlock));
    37. 

  37. 

  38. 	for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
    39. 

  39. 		yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, i);
    40. 

  40. 		if (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT) {
    41. 

  41. 			T(YAFFS_TRACE_CHECKPOINT, (TSTR("erasing checkpt block %d"TENDSTR), i));
    42. 

  42. 

  43. 			dev->nBlockErasures++;
    44. 

  44. 

  45. 			if (dev->param.eraseBlockInNAND(dev, i - dev->blockOffset /* realign */)) {
    46. 

  46. 				bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
    47. 

  47. 				dev->nErasedBlocks++;
    48. 

  48. 				dev->nFreeChunks += dev->param.nChunksPerBlock;
    49. 

  49. 			} else {
    50. 

  50. 				dev->param.markNANDBlockBad(dev, i);
    51. 

  51. 				bi->blockState = YAFFS_BLOCK_STATE_DEAD;
    52. 

  52. 			}
    53. 

  53. 		}
    54. 

  54. 	}
    55. 

  55. 

  56. 	dev->blocksInCheckpoint = 0;
    57. 

  57. 

  58. 	return 1;
    59. 

  59. }
    60. 

  60. 

  61. 

  62. static void yaffs2_CheckpointFindNextErasedBlock(yaffs_Device *dev)
    63. 

  63. {
    64. 

  64. 	int  i;
    65. 

  65. 	int blocksAvailable = dev->nErasedBlocks - dev->param.nReservedBlocks;
    66. 

  66. 	T(YAFFS_TRACE_CHECKPOINT,
    67. 

  67. 		(TSTR("allocating checkpt block: erased %d reserved %d avail %d next %d "TENDSTR),
    68. 

  68. 		dev->nErasedBlocks, dev->param.nReservedBlocks, blocksAvailable, dev->checkpointNextBlock));
    69. 

  69. 

  70. 	if (dev->checkpointNextBlock >= 0 &&
    71. 

  71. 			dev->checkpointNextBlock <= dev->internalEndBlock &&
    72. 

  72. 			blocksAvailable > 0) {
    73. 

  73. 

  74. 		for (i = dev->checkpointNextBlock; i <= dev->internalEndBlock; i++) {
    75. 

  75. 			yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, i);
    76. 

  76. 			if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
    77. 

  77. 				dev->checkpointNextBlock = i + 1;
    78. 

  78. 				dev->checkpointCurrentBlock = i;
    79. 

  79. 				T(YAFFS_TRACE_CHECKPOINT, (TSTR("allocating checkpt block %d"TENDSTR), i));
    80. 

  80. 				return;
    81. 

  81. 			}
    82. 

  82. 		}
    83. 

  83. 	}
    84. 

  84. 	T(YAFFS_TRACE_CHECKPOINT, (TSTR("out of checkpt blocks"TENDSTR)));
    85. 

  85. 

  86. 	dev->checkpointNextBlock = -1;
    87. 

  87. 	dev->checkpointCurrentBlock = -1;
    88. 

  88. }
    89. 

  89. 

  90. static void yaffs2_CheckpointFindNextCheckpointBlock(yaffs_Device *dev)
    91. 

  91. {
    92. 

  92. 	int  i;
    93. 

  93. 	yaffs_ExtendedTags tags;
    94. 

  94. 

  95. 	T(YAFFS_TRACE_CHECKPOINT, (TSTR("find next checkpt block: start:  blocks %d next %d" TENDSTR),
    96. 

  96. 		dev->blocksInCheckpoint, dev->checkpointNextBlock));
    97. 

  97. 

  98. 	if (dev->blocksInCheckpoint < dev->checkpointMaxBlocks)
    99. 

  99. 		for (i = dev->checkpointNextBlock; i <= dev->internalEndBlock; i++) {
    100. 

  100. 			int chunk = i * dev->param.nChunksPerBlock;
    101. 

  101. 			int realignedChunk = chunk - dev->chunkOffset;
    102. 

  102. 

  103. 			dev->param.readChunkWithTagsFromNAND(dev, realignedChunk,
    104. 

  104. 					NULL, &tags);
    105. 

  105. 			T(YAFFS_TRACE_CHECKPOINT, (TSTR("find next checkpt block: search: block %d oid %d seq %d eccr %d" TENDSTR),
    106. 

  106. 				i, tags.objectId, tags.sequenceNumber, tags.eccResult));
    107. 

  107. 

  108. 			if (tags.sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA) {
    109. 

  109. 				/* Right kind of block */
    110. 

  110. 				dev->checkpointNextBlock = tags.objectId;
    111. 

  111. 				dev->checkpointCurrentBlock = i;
    112. 

  112. 				dev->checkpointBlockList[dev->blocksInCheckpoint] = i;
    113. 

  113. 				dev->blocksInCheckpoint++;
    114. 

  114. 				T(YAFFS_TRACE_CHECKPOINT, (TSTR("found checkpt block %d"TENDSTR), i));
    115. 

  115. 				return;
    116. 

  116. 			}
    117. 

  117. 		}
    118. 

  118. 

  119. 	T(YAFFS_TRACE_CHECKPOINT, (TSTR("found no more checkpt blocks"TENDSTR)));
    120. 

  120. 

  121. 	dev->checkpointNextBlock = -1;
    122. 

  122. 	dev->checkpointCurrentBlock = -1;
    123. 

  123. }
    124. 

  124. 

  125. 

  126. int yaffs2_CheckpointOpen(yaffs_Device *dev, int forWriting)
    127. 

  127. {
    128. 

  128. 

  129. 

  130. 	dev->checkpointOpenForWrite = forWriting;
    131. 

  131. 

  132. 	/* Got the functions we need? */
    133. 

  133. 	if (!dev->param.writeChunkWithTagsToNAND ||
    134. 

  134. 		!dev->param.readChunkWithTagsFromNAND ||
    135. 

  135. 		!dev->param.eraseBlockInNAND ||
    136. 

  136. 		!dev->param.markNANDBlockBad)
    137. 

  137. 		return 0;
    138. 

  138. 

  139. 	if (forWriting && !yaffs2_CheckpointSpaceOk(dev))
    140. 

  140. 		return 0;
    141. 

  141. 

  142. 	if (!dev->checkpointBuffer)
    143. 

  143. 		dev->checkpointBuffer = YMALLOC_DMA(dev->param.totalBytesPerChunk);
    144. 

  144. 	if (!dev->checkpointBuffer)
    145. 

  145. 		return 0;
    146. 

  146. 

  147. 

  148. 	dev->checkpointPageSequence = 0;
    149. 

  149. 	dev->checkpointByteCount = 0;
    150. 

  150. 	dev->checkpointSum = 0;
    151. 

  151. 	dev->checkpointXor = 0;
    152. 

  152. 	dev->checkpointCurrentBlock = -1;
    153. 

  153. 	dev->checkpointCurrentChunk = -1;
    154. 

  154. 	dev->checkpointNextBlock = dev->internalStartBlock;
    155. 

  155. 

  156. 	/* Erase all the blocks in the checkpoint area */
    157. 

  157. 	if (forWriting) {
    158. 

  158. 		memset(dev->checkpointBuffer, 0, dev->nDataBytesPerChunk);
    159. 

  159. 		dev->checkpointByteOffset = 0;
    160. 

  160. 		return yaffs2_CheckpointErase(dev);
    161. 

  161. 	} else {
    162. 

  162. 		int i;
    163. 

  163. 		/* Set to a value that will kick off a read */
    164. 

  164. 		dev->checkpointByteOffset = dev->nDataBytesPerChunk;
    165. 

  165. 		/* A checkpoint block list of 1 checkpoint block per 16 block is (hopefully)
    166. 

  166. 		 * going to be way more than we need */
    167. 

  167. 		dev->blocksInCheckpoint = 0;
    168. 

  168. 		dev->checkpointMaxBlocks = (dev->internalEndBlock - dev->internalStartBlock)/16 + 2;
    169. 

  169. 		dev->checkpointBlockList = YMALLOC(sizeof(int) * dev->checkpointMaxBlocks);
    170. 

  170. 		if(!dev->checkpointBlockList)
    171. 

  171. 			return 0;
    172. 

  172. 

  173. 		for (i = 0; i < dev->checkpointMaxBlocks; i++)
    174. 

  174. 			dev->checkpointBlockList[i] = -1;
    175. 

  175. 	}
    176. 

  176. 

  177. 	return 1;
    178. 

  178. }
    179. 

  179. 

  180. int yaffs2_GetCheckpointSum(yaffs_Device *dev, __u32 *sum)
    181. 

  181. {
    182. 

  182. 	__u32 compositeSum;
    183. 

  183. 	compositeSum =  (dev->checkpointSum << 8) | (dev->checkpointXor & 0xFF);
    184. 

  184. 	*sum = compositeSum;
    185. 

  185. 	return 1;
    186. 

  186. }
    187. 

  187. 

  188. static int yaffs2_CheckpointFlushBuffer(yaffs_Device *dev)
    189. 

  189. {
    190. 

  190. 	int chunk;
    191. 

  191. 	int realignedChunk;
    192. 

  192. 

  193. 	yaffs_ExtendedTags tags;
    194. 

  194. 

  195. 	if (dev->checkpointCurrentBlock < 0) {
    196. 

  196. 		yaffs2_CheckpointFindNextErasedBlock(dev);
    197. 

  197. 		dev->checkpointCurrentChunk = 0;
    198. 

  198. 	}
    199. 

  199. 

  200. 	if (dev->checkpointCurrentBlock < 0)
    201. 

  201. 		return 0;
    202. 

  202. 

  203. 	tags.chunkDeleted = 0;
    204. 

  204. 	tags.objectId = dev->checkpointNextBlock; /* Hint to next place to look */
    205. 

  205. 	tags.chunkId = dev->checkpointPageSequence + 1;
    206. 

  206. 	tags.sequenceNumber =  YAFFS_SEQUENCE_CHECKPOINT_DATA;
    207. 

  207. 	tags.byteCount = dev->nDataBytesPerChunk;
    208. 

  208. 	if (dev->checkpointCurrentChunk == 0) {
    209. 

  209. 		/* First chunk we write for the block? Set block state to
    210. 

  210. 		   checkpoint */
    211. 

  211. 		yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, dev->checkpointCurrentBlock);
    212. 

  212. 		bi->blockState = YAFFS_BLOCK_STATE_CHECKPOINT;
    213. 

  213. 		dev->blocksInCheckpoint++;
    214. 

  214. 	}
    215. 

  215. 

  216. 	chunk = dev->checkpointCurrentBlock * dev->param.nChunksPerBlock + dev->checkpointCurrentChunk;
    217. 

  217. 

  218. 

  219. 	T(YAFFS_TRACE_CHECKPOINT, (TSTR("checkpoint wite buffer nand %d(%d:%d) objid %d chId %d" TENDSTR),
    220. 

  220. 		chunk, dev->checkpointCurrentBlock, dev->checkpointCurrentChunk, tags.objectId, tags.chunkId));
    221. 

  221. 

  222. 	realignedChunk = chunk - dev->chunkOffset;
    223. 

  223. 

  224. 	dev->nPageWrites++;
    225. 

  225. 

  226. 	dev->param.writeChunkWithTagsToNAND(dev, realignedChunk,
    227. 

  227. 			dev->checkpointBuffer, &tags);
    228. 

  228. 	dev->checkpointByteOffset = 0;
    229. 

  229. 	dev->checkpointPageSequence++;
    230. 

  230. 	dev->checkpointCurrentChunk++;
    231. 

  231. 	if (dev->checkpointCurrentChunk >= dev->param.nChunksPerBlock) {
    232. 

  232. 		dev->checkpointCurrentChunk = 0;
    233. 

  233. 		dev->checkpointCurrentBlock = -1;
    234. 

  234. 	}
    235. 

  235. 	memset(dev->checkpointBuffer, 0, dev->nDataBytesPerChunk);
    236. 

  236. 

  237. 	return 1;
    238. 

  238. }
    239. 

  239. 

  240. 

  241. int yaffs2_CheckpointWrite(yaffs_Device *dev, const void *data, int nBytes)
    242. 

  242. {
    243. 

  243. 	int i = 0;
    244. 

  244. 	int ok = 1;
    245. 

  245. 

  246. 

  247. 	__u8 * dataBytes = (__u8 *)data;
    248. 

  248. 

  249. 

  250. 

  251. 	if (!dev->checkpointBuffer)
    252. 

  252. 		return 0;
    253. 

  253. 

  254. 	if (!dev->checkpointOpenForWrite)
    255. 

  255. 		return -1;
    256. 

  256. 

  257. 	while (i < nBytes && ok) {
    258. 

  258. 		dev->checkpointBuffer[dev->checkpointByteOffset] = *dataBytes;
    259. 

  259. 		dev->checkpointSum += *dataBytes;
    260. 

  260. 		dev->checkpointXor ^= *dataBytes;
    261. 

  261. 

  262. 		dev->checkpointByteOffset++;
    263. 

  263. 		i++;
    264. 

  264. 		dataBytes++;
    265. 

  265. 		dev->checkpointByteCount++;
    266. 

  266. 

  267. 

  268. 		if (dev->checkpointByteOffset < 0 ||
    269. 

  269. 		   dev->checkpointByteOffset >= dev->nDataBytesPerChunk)
    270. 

  270. 			ok = yaffs2_CheckpointFlushBuffer(dev);
    271. 

  271. 	}
    272. 

  272. 

  273. 	return i;
    274. 

  274. }
    275. 

  275. 

  276. int yaffs2_CheckpointRead(yaffs_Device *dev, void *data, int nBytes)
    277. 

  277. {
    278. 

  278. 	int i = 0;
    279. 

  279. 	int ok = 1;
    280. 

  280. 	yaffs_ExtendedTags tags;
    281. 

  281. 

  282. 

  283. 	int chunk;
    284. 

  284. 	int realignedChunk;
    285. 

  285. 

  286. 	__u8 *dataBytes = (__u8 *)data;
    287. 

  287. 

  288. 	if (!dev->checkpointBuffer)
    289. 

  289. 		return 0;
    290. 

  290. 

  291. 	if (dev->checkpointOpenForWrite)
    292. 

  292. 		return -1;
    293. 

  293. 

  294. 	while (i < nBytes && ok) {
    295. 

  295. 

  296. 

  297. 		if (dev->checkpointByteOffset < 0 ||
    298. 

  298. 			dev->checkpointByteOffset >= dev->nDataBytesPerChunk) {
    299. 

  299. 

  300. 			if (dev->checkpointCurrentBlock < 0) {
    301. 

  301. 				yaffs2_CheckpointFindNextCheckpointBlock(dev);
    302. 

  302. 				dev->checkpointCurrentChunk = 0;
    303. 

  303. 			}
    304. 

  304. 

  305. 			if (dev->checkpointCurrentBlock < 0)
    306. 

  306. 				ok = 0;
    307. 

  307. 			else {
    308. 

  308. 				chunk = dev->checkpointCurrentBlock *
    309. 

  309. 					dev->param.nChunksPerBlock +
    310. 

  310. 					dev->checkpointCurrentChunk;
    311. 

  311. 

  312. 				realignedChunk = chunk - dev->chunkOffset;
    313. 

  313. 				
    314. 

  314. 				dev->nPageReads++;
    315. 

  315. 

  316. 				/* read in the next chunk */
    317. 

  317. 				/* printf("read checkpoint page %d\n",dev->checkpointPage); */
    318. 

  318. 				dev->param.readChunkWithTagsFromNAND(dev,
    319. 

  319. 						realignedChunk,
    320. 

  320. 						dev->checkpointBuffer,
    321. 

  321. 						&tags);
    322. 

  322. 

  323. 				if (tags.chunkId != (dev->checkpointPageSequence + 1) ||
    324. 

  324. 					tags.eccResult > YAFFS_ECC_RESULT_FIXED ||
    325. 

  325. 					tags.sequenceNumber != YAFFS_SEQUENCE_CHECKPOINT_DATA)
    326. 

  326. 					ok = 0;
    327. 

  327. 

  328. 				dev->checkpointByteOffset = 0;
    329. 

  329. 				dev->checkpointPageSequence++;
    330. 

  330. 				dev->checkpointCurrentChunk++;
    331. 

  331. 

  332. 				if (dev->checkpointCurrentChunk >= dev->param.nChunksPerBlock)
    333. 

  333. 					dev->checkpointCurrentBlock = -1;
    334. 

  334. 			}
    335. 

  335. 		}
    336. 

  336. 

  337. 		if (ok) {
    338. 

  338. 			*dataBytes = dev->checkpointBuffer[dev->checkpointByteOffset];
    339. 

  339. 			dev->checkpointSum += *dataBytes;
    340. 

  340. 			dev->checkpointXor ^= *dataBytes;
    341. 

  341. 			dev->checkpointByteOffset++;
    342. 

  342. 			i++;
    343. 

  343. 			dataBytes++;
    344. 

  344. 			dev->checkpointByteCount++;
    345. 

  345. 		}
    346. 

  346. 	}
    347. 

  347. 

  348. 	return 	i;
    349. 

  349. }
    350. 

  350. 

  351. int yaffs2_CheckpointClose(yaffs_Device *dev)
    352. 

  352. {
    353. 

  353. 

  354. 	if (dev->checkpointOpenForWrite) {
    355. 

  355. 		if (dev->checkpointByteOffset != 0)
    356. 

  356. 			yaffs2_CheckpointFlushBuffer(dev);
    357. 

  357. 	} else if(dev->checkpointBlockList){
    358. 

  358. 		int i;
    359. 

  359. 		for (i = 0; i < dev->blocksInCheckpoint && dev->checkpointBlockList[i] >= 0; i++) {
    360. 

  360. 			int blk = dev->checkpointBlockList[i];
    361. 

  361. 			yaffs_BlockInfo *bi = NULL;
    362. 

  362. 			if( dev->internalStartBlock <= blk && blk <= dev->internalEndBlock)
    363. 

  363. 				bi = yaffs_GetBlockInfo(dev, blk);
    364. 

  364. 			if (bi && bi->blockState == YAFFS_BLOCK_STATE_EMPTY)
    365. 

  365. 				bi->blockState = YAFFS_BLOCK_STATE_CHECKPOINT;
    366. 

  366. 			else {
    367. 

  367. 				/* Todo this looks odd... */
    368. 

  368. 			}
    369. 

  369. 		}
    370. 

  370. 		YFREE(dev->checkpointBlockList);
    371. 

  371. 		dev->checkpointBlockList = NULL;
    372. 

  372. 	}
    373. 

  373. 

  374. 	dev->nFreeChunks -= dev->blocksInCheckpoint * dev->param.nChunksPerBlock;
    375. 

  375. 	dev->nErasedBlocks -= dev->blocksInCheckpoint;
    376. 

  376. 

  377. 

  378. 	T(YAFFS_TRACE_CHECKPOINT, (TSTR("checkpoint byte count %d" TENDSTR),
    379. 

  379. 			dev->checkpointByteCount));
    380. 

  380. 

  381. 	if (dev->checkpointBuffer) {
    382. 

  382. 		/* free the buffer */
    383. 

  383. 		YFREE(dev->checkpointBuffer);
    384. 

  384. 		dev->checkpointBuffer = NULL;
    385. 

  385. 		return 1;
    386. 

  386. 	} else
    387. 

  387. 		return 0;
    388. 

  388. }
    389. 

  389. 

  390. int yaffs2_CheckpointInvalidateStream(yaffs_Device *dev)
    391. 

  391. {
    392. 

  392. 	/* Erase the checkpoint data */
    393. 

  393. 

  394. 	T(YAFFS_TRACE_CHECKPOINT, (TSTR("checkpoint invalidate of %d blocks"TENDSTR),
    395. 

  395. 		dev->blocksInCheckpoint));
    396. 

  396. 

  397. 	return yaffs2_CheckpointErase(dev);
    398. 

  398. }
    399.