-/*\r
- * YAFFS: Yet another FFS. A NAND-flash specific file system.\r
- * yaffs_guts.c The main guts of YAFFS\r
- *\r
- * Copyright (C) 2002 Aleph One Ltd.\r
- * for Toby Churchill Ltd and Brightstar Engineering\r
- *\r
- * Created by Charles Manning <charles@aleph1.co.uk>\r
- *\r
- * This program is free software; you can redistribute it and/or modify\r
- * it under the terms of the GNU General Public License version 2 as\r
- * published by the Free Software Foundation.\r
- *\r
- */\r
- //yaffs_guts.c\r
-\r
-const char *yaffs_guts_c_version="$Id: yaffs_guts.c,v 1.12 2002-11-08 07:19:41 charles Exp $";\r
-\r
-#include "yportenv.h"\r
-\r
-#include "yaffsinterface.h"\r
-#include "yaffs_guts.h"\r
-\r
-\r
-#define YAFFS_GARBAGE_COLLECT_LOW_WATER 2\r
-\r
-\r
-\r
-// External functions for ECC on data\r
-void nand_calculate_ecc (const u_char *dat, u_char *ecc_code);\r
-int nand_correct_data (u_char *dat, u_char *read_ecc, u_char *calc_ecc);\r
-\r
-\r
-// countBits is a quick way of counting the number of bits in a byte.\r
-// ie. countBits[n] holds the number of 1 bits in a byte with the value n.\r
-\r
-static const char yaffs_countBitsTable[256] =\r
-{\r
-0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4,\r
-1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,\r
-1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,\r
-2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,\r
-1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,\r
-2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,\r
-2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,\r
-3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,\r
-1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,\r
-2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,\r
-2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,\r
-3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,\r
-2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,\r
-3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,\r
-3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,\r
-4,5,5,6,5,6,6,7,5,6,6,7,6,7,7,8\r
-};\r
-\r
-static int yaffs_CountBits(__u8 x)\r
-{\r
- int retVal;\r
- retVal = yaffs_countBitsTable[x];\r
- return retVal;\r
-}\r
-\r
-\r
-\r
-// Local prototypes\r
-static int yaffs_CheckObjectHashSanity(yaffs_Device *dev);\r
-static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr);\r
-static void yaffs_GetTagsFromSpare(yaffs_Device *dev, yaffs_Spare *sparePtr,yaffs_Tags *tagsPtr);\r
-static int yaffs_PutChunkIntoFile(yaffs_Object *in,int chunkInInode, int chunkInNAND, int inScan);\r
-\r
-static yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev,int number,yaffs_ObjectType type);\r
-static void yaffs_AddObjectToDirectory(yaffs_Object *directory, yaffs_Object *obj);\r
-static int yaffs_UpdateObjectHeader(yaffs_Object *in,const char *name, int force);\r
-static void yaffs_DeleteChunk(yaffs_Device *dev,int chunkId);\r
-static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj);\r
-static int yaffs_CheckStructures(void);\r
-static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, int chunkOffset,int *limit);\r
-static int yaffs_DoGenericObjectDeletion(yaffs_Object *in);\r
-\r
-static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device *dev,int blockNo);\r
-\r
-// Robustification\r
-static void yaffs_RetireBlock(yaffs_Device *dev,int blockInNAND);\r
-static void yaffs_HandleReadDataError(yaffs_Device *dev,int chunkInNAND);\r
-static void yaffs_HandleWriteChunkError(yaffs_Device *dev,int chunkInNAND);\r
-static void yaffs_HandleWriteChunkOk(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_Spare *spare);\r
-static void yaffs_HandleUpdateChunk(yaffs_Device *dev,int chunkInNAND, const yaffs_Spare *spare);\r
-\r
-static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,int chunkInNAND);\r
-\r
-static int yaffs_UnlinkWorker(yaffs_Object *obj);\r
-\r
-\r
-static int yaffs_VerifyCompare(const __u8 *d0, const __u8 * d1, const yaffs_Spare *s0, const yaffs_Spare *s1);\r
-\r
-\r
-\r
-loff_t yaffs_GetFileSize(yaffs_Object *obj);\r
-\r
-static int yaffs_ReadChunkTagsFromNAND(yaffs_Device *dev,int chunkInNAND, yaffs_Tags *tags, int *chunkDeleted);\r
-static int yaffs_TagsMatch(const yaffs_Tags *tags, int objectId, int chunkInObject, int chunkDeleted);\r
-\r
-\r
-static int yaffs_AllocateChunk(yaffs_Device *dev,int useReserve);\r
-\r
-#ifdef YAFFS_PARANOID\r
-static int yaffs_CheckFileSanity(yaffs_Object *in);\r
-#else\r
-#define yaffs_CheckFileSanity(in)\r
-#endif\r
-\r
-static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in);\r
-static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId);\r
-\r
-\r
-static __inline__ yaffs_BlockInfo* yaffs_GetBlockInfo(yaffs_Device *dev, int blk)\r
-{\r
- if(blk < dev->startBlock || blk > dev->endBlock)\r
- {\r
- T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs: block %d is not valid" TENDSTR),blk));\r
- YBUG();\r
- }\r
- return &dev->blockInfo[blk - dev->startBlock];\r
-}\r
-\r
-\r
-static __inline__ int yaffs_HashFunction(int n)\r
-{\r
- return (n % YAFFS_NOBJECT_BUCKETS);\r
-}\r
-\r
-\r
-yaffs_Object *yaffs_Root(yaffs_Device *dev)\r
-{\r
- return dev->rootDir;\r
-}\r
-\r
-yaffs_Object *yaffs_LostNFound(yaffs_Device *dev)\r
-{\r
- return dev->lostNFoundDir;\r
-}\r
-\r
-\r
-static int yaffs_WriteChunkToNAND(struct yaffs_DeviceStruct *dev,int chunkInNAND, const __u8 *data, yaffs_Spare *spare)\r
-{\r
- if(chunkInNAND < dev->startBlock * YAFFS_CHUNKS_PER_BLOCK)\r
- {\r
- T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs chunk %d is not valid" TENDSTR),chunkInNAND));\r
- return YAFFS_FAIL;\r
- }\r
-\r
- dev->nPageWrites++;\r
- return dev->writeChunkToNAND(dev,chunkInNAND,data,spare);\r
-}\r
-\r
-\r
-int yaffs_ReadChunkFromNAND(struct yaffs_DeviceStruct *dev,\r
- int chunkInNAND, \r
- __u8 *data, \r
- yaffs_Spare *spare, \r
- int doErrorCorrection)\r
-{\r
- int retVal;\r
- __u8 calcEcc[3];\r
- yaffs_Spare localSpare;\r
- int eccResult1,eccResult2;\r
- \r
- dev->nPageReads++;\r
- \r
- \r
-\r
- \r
- if(!spare && data)\r
- {\r
- // If we don't have a real spare, then we use a local one.\r
- // Need this for the calculation of the ecc\r
- spare = &localSpare;\r
- }\r
- \r
- retVal = dev->readChunkFromNAND(dev,chunkInNAND,data,spare);\r
- if(data && doErrorCorrection)\r
- {\r
- // Do ECC correction\r
- //Todo handle any errors\r
- nand_calculate_ecc(data,calcEcc);\r
- eccResult1 = nand_correct_data (data,spare->ecc1, calcEcc);\r
- nand_calculate_ecc(&data[256],calcEcc);\r
- eccResult2 = nand_correct_data (&data[256],spare->ecc2, calcEcc);\r
- \r
- if(eccResult1>0)\r
- {\r
- T(YAFFS_TRACE_ERROR, (TSTR("**>>ecc error fix performed on chunk %d:0" TENDSTR),chunkInNAND));\r
- dev->eccFixed++;\r
- }\r
- else if(eccResult1<0)\r
- {\r
- T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:0" TENDSTR),chunkInNAND));\r
- dev->eccUnfixed++;\r
- }\r
- \r
- if(eccResult2>0)\r
- {\r
- T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error fix performed on chunk %d:1" TENDSTR),chunkInNAND));\r
- dev->eccFixed++;\r
- }\r
- else if(eccResult2<0)\r
- {\r
- T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:1" TENDSTR),chunkInNAND));\r
- dev->eccUnfixed++;\r
- }\r
- \r
- if(eccResult1 || eccResult2)\r
- {\r
- // Hoosterman, we had a data problem on this page\r
- yaffs_HandleReadDataError(dev,chunkInNAND);\r
- }\r
- }\r
-\r
- return retVal;\r
-}\r
-\r
-\r
-static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,int chunkInNAND)\r
-{\r
-\r
- static int init = 0;\r
- static __u8 cmpbuf[YAFFS_BYTES_PER_CHUNK];\r
- static __u8 data[YAFFS_BYTES_PER_CHUNK];\r
- static __u8 spare[16];\r
- \r
- \r
- dev->readChunkFromNAND(dev,chunkInNAND,data,(yaffs_Spare *)spare);\r
- \r
- \r
- \r
- if(!init)\r
- {\r
- memset(cmpbuf,0xff,YAFFS_BYTES_PER_CHUNK);\r
- init = 1;\r
- }\r
- \r
- if(memcmp(cmpbuf,data,YAFFS_BYTES_PER_CHUNK)) return YAFFS_FAIL;\r
- if(memcmp(cmpbuf,spare,16)) return YAFFS_FAIL;\r
-\r
- \r
- return YAFFS_OK;\r
- \r
-}\r
-\r
-\r
-\r
-int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,int blockInNAND)\r
-{\r
- dev->nBlockErasures++;\r
- return dev->eraseBlockInNAND(dev,blockInNAND);\r
-}\r
-\r
-int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev)\r
-{\r
- return dev->initialiseNAND(dev);\r
-}\r
-\r
-static int yaffs_WriteNewChunkToNAND(struct yaffs_DeviceStruct *dev, const __u8 *data, yaffs_Spare *spare,int useReserve)\r
-{\r
- int chunk;\r
- \r
- int writeOk = 1;\r
- int attempts = 0;\r
- \r
- unsigned char rbData[YAFFS_BYTES_PER_CHUNK];\r
- yaffs_Spare rbSpare;\r
- \r
- do{\r
- chunk = yaffs_AllocateChunk(dev,useReserve);\r
- \r
- if(chunk >= 0)\r
- {\r
-\r
- // First check this chunk is erased...\r
-#ifndef CONFIG_YAFFS_DISABLE_CHUNK_ERASED_CHECK\r
- writeOk = yaffs_CheckChunkErased(dev,chunk);\r
-#endif \r
- if(!writeOk)\r
- {\r
- T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs chunk %d was not erased" TENDSTR),chunk));\r
- }\r
- else\r
- {\r
- writeOk = yaffs_WriteChunkToNAND(dev,chunk,data,spare);\r
- }\r
- attempts++;\r
- if(writeOk)\r
- {\r
- // Readback & verify\r
- // If verify fails, then delete this chunk and try again\r
- // To verify we compare everything except the block and \r
- // page status bytes.\r
- // NB We check a raw read without ECC correction applied\r
- yaffs_ReadChunkFromNAND(dev,chunk,rbData,&rbSpare,0);\r
- \r
-#ifndef CONFIG_YAFFS_DISABLE_WRITE_VERIFY\r
- if(!yaffs_VerifyCompare(data,rbData,spare,&rbSpare))\r
- {\r
- // Didn't verify\r
- T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs write verify failed on chunk %d" TENDSTR), chunk));\r
-\r
- writeOk = 0;\r
- } \r
-#endif \r
- \r
- }\r
- if(writeOk)\r
- {\r
- // Copy the data into the write buffer.\r
- // NB We do this at the end to prevent duplicates in the case of a write error.\r
- //Todo\r
- yaffs_HandleWriteChunkOk(dev,chunk,data,spare);\r
- }\r
- else\r
- {\r
- yaffs_HandleWriteChunkError(dev,chunk);\r
- }\r
- }\r
- \r
- } while(chunk >= 0 && ! writeOk);\r
- \r
- if(attempts > 1)\r
- {\r
- T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs write required %d attempts" TENDSTR),attempts));\r
- dev->nRetriedWrites+= (attempts - 1); \r
- }\r
- \r
- return chunk;\r
-}\r
-\r
-///\r
-// Functions for robustisizing\r
-//\r
-//\r
-\r
-static void yaffs_RetireBlock(yaffs_Device *dev,int blockInNAND)\r
-{\r
- // Ding the blockStatus in the first two pages of the block.\r
- \r
- yaffs_Spare spare;\r
-\r
- memset(&spare, 0xff,sizeof(yaffs_Spare));\r
-\r
- spare.blockStatus = 0;\r
- \r
- yaffs_WriteChunkToNAND(dev, blockInNAND * YAFFS_CHUNKS_PER_BLOCK, NULL , &spare);\r
- yaffs_WriteChunkToNAND(dev, blockInNAND * YAFFS_CHUNKS_PER_BLOCK + 1, NULL , &spare);\r
- \r
- yaffs_GetBlockInfo(dev,blockInNAND)->blockState = YAFFS_BLOCK_STATE_DEAD;\r
- dev->nRetiredBlocks++;\r
-}\r
-\r
-\r
-\r
-static int yaffs_RewriteBufferedBlock(yaffs_Device *dev)\r
-{\r
- dev->doingBufferedBlockRewrite = 1;\r
- //\r
- // Remove erased chunks\r
- // Rewrite existing chunks to a new block\r
- // Set current write block to the new block\r
- \r
- dev->doingBufferedBlockRewrite = 0;\r
- \r
- return 1;\r
-}\r
-\r
-\r
-static void yaffs_HandleReadDataError(yaffs_Device *dev,int chunkInNAND)\r
-{\r
- int blockInNAND = chunkInNAND/YAFFS_CHUNKS_PER_BLOCK;\r
-\r
- // Mark the block for retirement\r
- yaffs_GetBlockInfo(dev,blockInNAND)->needsRetiring = 1;\r
- T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>>Block %d marked for retirement" TENDSTR),blockInNAND));\r
-\r
-\r
- //TODO \r
- // Just do a garbage collection on the affected block then retire the block\r
- // NB recursion\r
-}\r
-\r
-\r
-static void yaffs_CheckWrittenBlock(yaffs_Device *dev,int chunkInNAND)\r
-{\r
-}\r
-\r
-static void yaffs_HandleWriteChunkOk(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_Spare *spare)\r
-{\r
-}\r
-\r
-static void yaffs_HandleUpdateChunk(yaffs_Device *dev,int chunkInNAND, const yaffs_Spare *spare)\r
-{\r
-}\r
-\r
-static void yaffs_HandleWriteChunkError(yaffs_Device *dev,int chunkInNAND)\r
-{\r
- int blockInNAND = chunkInNAND/YAFFS_CHUNKS_PER_BLOCK;\r
-\r
- // Mark the block for retirement\r
- yaffs_GetBlockInfo(dev,blockInNAND)->needsRetiring = 1;\r
- // Delete the chunk\r
- yaffs_DeleteChunk(dev,chunkInNAND);\r
-}\r
-\r
-\r
-\r
-\r
-static int yaffs_VerifyCompare(const __u8 *d0, const __u8 * d1, const yaffs_Spare *s0, const yaffs_Spare *s1)\r
-{\r
-\r
-\r
- if( memcmp(d0,d1,YAFFS_BYTES_PER_CHUNK) != 0 ||\r
- s0->tagByte0 != s1->tagByte0 ||\r
- s0->tagByte1 != s1->tagByte1 ||\r
- s0->tagByte2 != s1->tagByte2 ||\r
- s0->tagByte3 != s1->tagByte3 ||\r
- s0->tagByte4 != s1->tagByte4 ||\r
- s0->tagByte5 != s1->tagByte5 ||\r
- s0->tagByte6 != s1->tagByte6 ||\r
- s0->tagByte7 != s1->tagByte7 ||\r
- s0->ecc1[0] != s1->ecc1[0] ||\r
- s0->ecc1[1] != s1->ecc1[1] ||\r
- s0->ecc1[2] != s1->ecc1[2] ||\r
- s0->ecc2[0] != s1->ecc2[0] ||\r
- s0->ecc2[1] != s1->ecc2[1] ||\r
- s0->ecc2[2] != s1->ecc2[2] )\r
- {\r
- return 0;\r
- }\r
- \r
- return 1;\r
-}\r
-\r
-\r
-///////////////////////// Object management //////////////////\r
-// List of spare objects\r
-// The list is hooked together using the first pointer\r
-// in the object\r
-\r
-// static yaffs_Object *yaffs_freeObjects = NULL;\r
-\r
-// static int yaffs_nFreeObjects;\r
-\r
-// static yaffs_ObjectList *yaffs_allocatedObjectList = NULL;\r
-\r
-// static yaffs_ObjectBucket yaffs_objectBucket[YAFFS_NOBJECT_BUCKETS];\r
-\r
-\r
-static __u16 yaffs_CalcNameSum(const char *name)\r
-{\r
- __u16 sum = 0;\r
- __u16 i = 1;\r
- \r
- __u8 *bname = (__u8 *)name;\r
- if(bname)\r
- {\r
- while ((*bname) && (i <=YAFFS_MAX_NAME_LENGTH))\r
- {\r
-#ifdef CONFIG_YAFFS_WINCE\r
- sum += toupper(*bname) * i;\r
-#else\r
- sum += (*bname) * i;\r
-#endif\r
- i++;\r
- bname++;\r
- }\r
- }\r
- return sum;\r
-}\r
-\r
-void yaffs_SetObjectName(yaffs_Object *obj, const char *name)\r
-{\r
-#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM\r
- if(name && strlen(name) <= YAFFS_SHORT_NAME_LENGTH)\r
- {\r
- strcpy(obj->shortName,name);\r
- }\r
- else\r
- {\r
- obj->shortName[0]='\0';\r
- }\r
-#endif\r
- obj->sum = yaffs_CalcNameSum(name);\r
-}\r
-\r
-void yaffs_CalcECC(const __u8 *data, yaffs_Spare *spare)\r
-{\r
- nand_calculate_ecc (data , spare->ecc1);\r
- nand_calculate_ecc (&data[256] , spare->ecc2);\r
-}\r
-\r
-void yaffs_CalcTagsECC(yaffs_Tags *tags)\r
-{\r
- // Calculate an ecc\r
- \r
- unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes;\r
- unsigned i,j;\r
- unsigned ecc = 0;\r
- unsigned bit = 0;\r
-\r
- tags->ecc = 0;\r
- \r
- for(i = 0; i < 8; i++)\r
- {\r
- for(j = 1; j &0xff; j<<=1)\r
- {\r
- bit++;\r
- if(b[i] & j)\r
- {\r
- ecc ^= bit;\r
- }\r
- }\r
- }\r
- \r
- tags->ecc = ecc;\r
- \r
- \r
-}\r
-\r
-int yaffs_CheckECCOnTags(yaffs_Tags *tags)\r
-{\r
- unsigned ecc = tags->ecc;\r
- \r
- yaffs_CalcTagsECC(tags);\r
- \r
- ecc ^= tags->ecc;\r
- \r
- if(ecc && ecc <= 64)\r
- {\r
- // TODO: Handle the failure better. Retire?\r
- unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes;\r
-\r
- ecc--;\r
- \r
- b[ecc / 8] ^= (1 << (ecc & 7));\r
- \r
- // Now recvalc the ecc\r
- yaffs_CalcTagsECC(tags);\r
- \r
- return 1; // recovered error\r
- }\r
- else if(ecc)\r
- {\r
- // Wierd ecc failure value\r
- // TODO Need to do somethiong here\r
- return -1; //unrecovered error\r
- }\r
- \r
- return 0;\r
-}\r
-\r
-\r
-///////////////////////// TNODES ///////////////////////\r
-\r
-// List of spare tnodes\r
-// The list is hooked together using the first pointer\r
-// in the tnode.\r
-\r
-//static yaffs_Tnode *yaffs_freeTnodes = NULL;\r
-\r
-// static int yaffs_nFreeTnodes;\r
-\r
-//static yaffs_TnodeList *yaffs_allocatedTnodeList = NULL;\r
-\r
-\r
-\r
-// yaffs_CreateTnodes creates a bunch more tnodes and\r
-// adds them to the tnode free list.\r
-// Don't use this function directly\r
-\r
-static int yaffs_CreateTnodes(yaffs_Device *dev,int nTnodes)\r
-{\r
- int i;\r
- yaffs_Tnode *newTnodes;\r
- yaffs_TnodeList *tnl;\r
- \r
- if(nTnodes < 1) return YAFFS_OK;\r
- \r
- // make these things\r
- \r
- newTnodes = YMALLOC(nTnodes * sizeof(yaffs_Tnode));\r
- \r
- if (!newTnodes)\r
- {\r
- T(YAFFS_TRACE_ERROR,(TSTR("yaffs: Could not allocate Tnodes"TENDSTR)));\r
- return YAFFS_FAIL;\r
- }\r
- \r
- // Hook them into the free list\r
- for(i = 0; i < nTnodes - 1; i++)\r
- {\r
- newTnodes[i].internal[0] = &newTnodes[i+1];\r
- }\r
- \r
- newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;\r
- dev->freeTnodes = newTnodes;\r
- dev->nFreeTnodes+= nTnodes;\r
- dev->nTnodesCreated += nTnodes;\r
-\r
- // Now add this bunch of tnodes to a list for freeing up.\r
- // NB If we can't add this to the management list it isn't fatal\r
- // but it just means we can't free this bunch of tnodes later.\r
- tnl = YMALLOC(sizeof(yaffs_TnodeList));\r
- if(!tnl)\r
- {\r
- T(YAFFS_TRACE_ERROR,(TSTR("yaffs: Could not add tnodes to management list" TENDSTR)));\r
- \r
- }\r
- else\r
- {\r
- tnl->tnodes = newTnodes;\r
- tnl->next = dev->allocatedTnodeList;\r
- dev->allocatedTnodeList = tnl;\r
- }\r
-\r
-\r
- T(YAFFS_TRACE_ALLOCATE,(TSTR("yaffs: Tnodes added" TENDSTR)));\r
-\r
-\r
- return YAFFS_OK;\r
-}\r
-\r
-\r
-// GetTnode gets us a clean tnode. Tries to make allocate more if we run out\r
-static yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev)\r
-{\r
- yaffs_Tnode *tn = NULL;\r
- \r
- // If there are none left make more\r
- if(!dev->freeTnodes)\r
- {\r
- yaffs_CreateTnodes(dev,YAFFS_ALLOCATION_NTNODES);\r
- }\r
- \r
- if(dev->freeTnodes)\r
- {\r
- tn = dev->freeTnodes;\r
- dev->freeTnodes = dev->freeTnodes->internal[0];\r
- dev->nFreeTnodes--;\r
- // zero out\r
- memset(tn,0,sizeof(yaffs_Tnode));\r
- }\r
- \r
-\r
- return tn;\r
-}\r
-\r
-\r
-// FreeTnode frees up a tnode and puts it back on the free list\r
-static void yaffs_FreeTnode(yaffs_Device*dev, yaffs_Tnode *tn)\r
-{\r
- tn->internal[0] = dev->freeTnodes;\r
- dev->freeTnodes = tn;\r
- dev->nFreeTnodes++;\r
-}\r
-\r
-\r
-static void yaffs_DeinitialiseTnodes(yaffs_Device*dev)\r
-{\r
- // Free the list of allocated tnodes\r
- \r
- while(dev->allocatedTnodeList)\r
- {\r
- YFREE(dev->allocatedTnodeList->tnodes);\r
- dev->allocatedTnodeList = dev->allocatedTnodeList->next;\r
- }\r
- \r
- dev->freeTnodes = NULL;\r
- dev->nFreeTnodes = 0;\r
-}\r
-\r
-static void yaffs_InitialiseTnodes(yaffs_Device*dev)\r
-{\r
- dev->allocatedTnodeList = NULL;\r
- dev->freeTnodes = NULL;\r
- dev->nFreeTnodes = 0;\r
- dev->nTnodesCreated = 0;\r
-\r
-}\r
-\r
-#if 0\r
-void yaffs_TnodeTest(yaffs_Device *dev)\r
-{\r
-\r
- int i;\r
- int j;\r
- yaffs_Tnode *tn[1000];\r
- \r
- YINFO("Testing TNodes");\r
- \r
- for(j = 0; j < 50; j++)\r
- {\r
- for(i = 0; i < 1000; i++)\r
- {\r
- tn[i] = yaffs_GetTnode(dev);\r
- if(!tn[i])\r
- {\r
- YALERT("Getting tnode failed");\r
- }\r
- }\r
- for(i = 0; i < 1000; i+=3)\r
- {\r
- yaffs_FreeTnode(dev,tn[i]);\r
- tn[i] = NULL;\r
- }\r
- \r
- }\r
-}\r
-#endif\r
-\r
-\r
-////////////////// END OF TNODE MANIPULATION ///////////////////////////\r
-\r
-/////////////// Functions to manipulate the look-up tree (made up of tnodes)\r
-// The look up tree is represented by the top tnode and the number of topLevel\r
-// in the tree. 0 means only the level 0 tnode is in the tree.\r
-\r
-\r
-// FindLevel0Tnode finds the level 0 tnode, if one exists.\r
-// Used when reading.....\r
-static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,yaffs_FileStructure *fStruct, __u32 chunkId)\r
-{\r
- \r
- yaffs_Tnode *tn = fStruct->top;\r
- __u32 i;\r
- int requiredTallness; \r
- int level = fStruct->topLevel;\r
- \r
- // Check sane level and chunk Id\r
- if(level < 0 || level > YAFFS_TNODES_MAX_LEVEL)\r
- {\r
-// char str[50];\r
-// sprintf(str,"Bad level %d",level);\r
-// YALERT(str);\r
- return NULL;\r
- }\r
- \r
- if(chunkId > YAFFS_MAX_CHUNK_ID)\r
- {\r
-// char str[50];\r
-// sprintf(str,"Bad chunkId %d",chunkId);\r
-// YALERT(str);\r
- return NULL;\r
- }\r
-\r
- // First check we're tall enough (ie enough topLevel)\r
- \r
- i = chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS);\r
- requiredTallness = 0;\r
- while(i)\r
- {\r
- i >>= YAFFS_TNODES_INTERNAL_BITS;\r
- requiredTallness++;\r
- }\r
- \r
- \r
- if(requiredTallness > fStruct->topLevel)\r
- {\r
- // Not tall enough, so we can't find it, return NULL.\r
- return NULL;\r
- }\r
- \r
- \r
- // Traverse down to level 0\r
- while (level > 0 && tn)\r
- {\r
- tn = tn->internal[(chunkId >>(/* dev->chunkGroupBits + */ YAFFS_TNODES_LEVEL0_BITS + (level-1) * YAFFS_TNODES_INTERNAL_BITS)) & \r
- YAFFS_TNODES_INTERNAL_MASK]; \r
- level--;\r
- \r
- }\r
- \r
- return tn; \r
-}\r
-\r
-// AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.\r
-// This happens in two steps:\r
-// 1. If the tree isn't tall enough, then make it taller.\r
-// 2. Scan down the tree towards the level 0 tnode adding tnodes if required.\r
-//\r
-// Used when modifying the tree.\r
-//\r
-static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev, yaffs_FileStructure *fStruct, __u32 chunkId)\r
-{\r
- \r
- yaffs_Tnode *tn; \r
- \r
- int requiredTallness;\r
- int i;\r
- int l;\r
- \r
- __u32 x;\r
- \r
- \r
- //T((TSTR("AddOrFind topLevel=%d, chunk=%d"),fStruct->topLevel,chunkId));\r
- \r
- // Check sane level and page Id\r
- if(fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL)\r
- {\r
-// char str[50];\r
-// sprintf(str,"Bad level %d",fStruct->topLevel);\r
-// YALERT(str);\r
- return NULL;\r
- }\r
- \r
- if(chunkId > YAFFS_MAX_CHUNK_ID)\r
- {\r
-// char str[50];\r
-// sprintf(str,"Bad chunkId %d",chunkId);\r
-// YALERT(str);\r
- return NULL;\r
- }\r
- \r
- // First check we're tall enough (ie enough topLevel)\r
- \r
- x = chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS);\r
- requiredTallness = 0;\r
- while(x)\r
- {\r
- x >>= YAFFS_TNODES_INTERNAL_BITS;\r
- requiredTallness++;\r
- }\r
- \r
- //T((TSTR(" required=%d"),requiredTallness));\r
- \r
- \r
- if(requiredTallness > fStruct->topLevel)\r
- {\r
- // Not tall enough,gotta make the tree taller\r
- for(i = fStruct->topLevel; i < requiredTallness; i++)\r
- {\r
- //T((TSTR(" add new top")));\r
- \r
- tn = yaffs_GetTnode(dev);\r
- \r
- if(tn)\r
- {\r
- tn->internal[0] = fStruct->top;\r
- fStruct->top = tn;\r
- }\r
- else\r
- {\r
- T(YAFFS_TRACE_ERROR,(TSTR("yaffs: no more tnodes" TENDSTR)));\r
- }\r
- }\r
- \r
- fStruct->topLevel = requiredTallness;\r
- }\r
- \r
- \r
- // Traverse down to level 0, adding anything we need\r
- \r
- l = fStruct->topLevel;\r
- tn = fStruct->top;\r
- while (l > 0 && tn)\r
- {\r
- x = (chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS + (l-1) * YAFFS_TNODES_INTERNAL_BITS)) & \r
- YAFFS_TNODES_INTERNAL_MASK;\r
- \r
- //T((TSTR(" [%d:%d]"),l,i));\r
- \r
- if(!tn->internal[x])\r
- {\r
- //T((TSTR(" added")));\r
- \r
- tn->internal[x] = yaffs_GetTnode(dev);\r
- }\r
- \r
- tn = tn->internal[x];\r
- l--;\r
- \r
- }\r
- \r
- //TSTR(TENDSTR)));\r
- \r
- return tn; \r
-}\r
-\r
-// DeleteWorker scans backwards through the tnode tree and deletes all the\r
-// chunks and tnodes in the file\r
-// Returns 1 if the tree was deleted. Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.\r
-\r
-static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, int chunkOffset,int *limit)\r
-{\r
- int i;\r
- int chunkInInode;\r
- int theChunk;\r
- yaffs_Tags tags;\r
- int found;\r
- int chunkDeleted;\r
- int allDone = 1;\r
- \r
- \r
- if(tn)\r
- {\r
- if(level > 0)\r
- {\r
- \r
- for(i = YAFFS_NTNODES_INTERNAL -1; allDone && i >= 0; i--)\r
- {\r
- if(tn->internal[i])\r
- {\r
- if(limit && (*limit) < 0)\r
- {\r
- allDone = 0;\r
- }\r
- else\r
- {\r
- allDone = yaffs_DeleteWorker(in,tn->internal[i],level - 1,\r
- (chunkOffset << YAFFS_TNODES_INTERNAL_BITS ) + i ,limit);\r
- }\r
- if(allDone)\r
- {\r
- yaffs_FreeTnode(in->myDev,tn->internal[i]);\r
- tn->internal[i] = NULL;\r
- }\r
- }\r
- \r
- }\r
- return (allDone) ? 1 : 0;\r
- }\r
- else if(level == 0)\r
- {\r
- for(i = YAFFS_NTNODES_LEVEL0 -1; i >= 0; i--) //NB Don't apply the limit here, always delete a whole level0\r
- {\r
- if(tn->level0[i])\r
- {\r
- int j;\r
- \r
- chunkInInode = (chunkOffset << YAFFS_TNODES_LEVEL0_BITS ) + i;\r
- \r
- theChunk = tn->level0[i] << in->myDev->chunkGroupBits;\r
-\r
- // Now we need to search for it\r
- for(j = 0,found = 0; theChunk && j < in->myDev->chunkGroupSize && !found; j++)\r
- {\r
- yaffs_ReadChunkTagsFromNAND(in->myDev,theChunk,&tags,&chunkDeleted);\r
- if(yaffs_TagsMatch(&tags,in->objectId,chunkInInode,chunkDeleted))\r
- {\r
- // found it;\r
- found = 1;\r
- \r
- }\r
- else\r
- {\r
- theChunk++;\r
- }\r
- }\r
- \r
- if(found)\r
- {\r
- yaffs_DeleteChunk(in->myDev,theChunk);\r
- in->nDataChunks--;\r
- if(limit)\r
- { \r
- *limit = *limit-1;\r
- }\r
- \r
- }\r
- \r
- tn->level0[i] = 0;\r
- }\r
- \r
- }\r
- return 1;\r
-\r
- \r
- }\r
- \r
- }\r
- \r
- return 1;\r
- \r
-}\r
-\r
-\r
-\r
-\r
-// Pruning removes any part of the file structure tree that is beyond the\r
-// bounds of the file (ie that does not point to chunks).\r
-//\r
-// A file should only get pruned when its size is reduced.\r
-//\r
-// Before pruning, the chunks must be pulled from the tree and the\r
-// level 0 tnode entries must be zeroed out.\r
-// Could also use this for file deletion, but that's probably better handled\r
-// by a special case.\r
-\r
-// yaffs_PruneWorker should only be called by yaffs_PruneFileStructure()\r
-\r
-static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn, __u32 level, int del0)\r
-{\r
- int i;\r
- int hasData;\r
- \r
- if(tn)\r
- {\r
- hasData = 0;\r
- \r
- for(i = 0; i < YAFFS_NTNODES_INTERNAL; i++)\r
- {\r
- if(tn->internal[i] && level > 0)\r
- {\r
- tn->internal[i] = yaffs_PruneWorker(dev,tn->internal[i],level - 1, ( i == 0) ? del0 : 1);\r
- }\r
- \r
- if(tn->internal[i])\r
- {\r
- hasData++;\r
- }\r
- }\r
- \r
- if(hasData == 0 && del0)\r
- {\r
- // Free and return NULL\r
- \r
- yaffs_FreeTnode(dev,tn);\r
- tn = NULL;\r
- }\r
- \r
- }\r
-\r
- return tn;\r
- \r
-}\r
-\r
-static int yaffs_PruneFileStructure(yaffs_Device *dev, yaffs_FileStructure *fStruct)\r
-{\r
- int i;\r
- int hasData;\r
- int done = 0;\r
- yaffs_Tnode *tn;\r
- \r
- if(fStruct->topLevel > 0)\r
- {\r
- fStruct->top = yaffs_PruneWorker(dev,fStruct->top, fStruct->topLevel,0);\r
- \r
- // Now we have a tree with all the non-zero branches NULL but the height\r
- // is the same as it was.\r
- // Let's see if we can trim internal tnodes to shorten the tree.\r
- // We can do this if only the 0th element in the tnode is in use \r
- // (ie all the non-zero are NULL)\r
- \r
- while(fStruct->topLevel && !done)\r
- {\r
- tn = fStruct->top;\r
- \r
- hasData = 0;\r
- for(i = 1; i <YAFFS_NTNODES_INTERNAL; i++)\r
- {\r
- if(tn->internal[i])\r
- {\r
- hasData++;\r
- }\r
- }\r
- \r
- if(!hasData)\r
- {\r
- fStruct->top = tn->internal[0];\r
- fStruct->topLevel--;\r
- yaffs_FreeTnode(dev,tn);\r
- }\r
- else\r
- {\r
- done = 1;\r
- }\r
- }\r
- }\r
- \r
- return YAFFS_OK;\r
-}\r
-\r
-\r
-\r
-\r
-\r
-/////////////////////// End of File Structure functions. /////////////////\r
-\r
-// yaffs_CreateFreeObjects creates a bunch more objects and\r
-// adds them to the object free list.\r
-static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)\r
-{\r
- int i;\r
- yaffs_Object *newObjects;\r
- yaffs_ObjectList *list;\r
- \r
- if(nObjects < 1) return YAFFS_OK;\r
- \r
- // make these things\r
- \r
- newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));\r
- \r
- if (!newObjects)\r
- {\r
- T(YAFFS_TRACE_ALLOCATE,(TSTR("yaffs: Could not allocate more objects" TENDSTR)));\r
- return YAFFS_FAIL;\r
- }\r
- \r
- // Hook them into the free list\r
- for(i = 0; i < nObjects - 1; i++)\r
- {\r
- (yaffs_Object *)newObjects[i].siblings.next = &newObjects[i+1];\r
- }\r
- \r
- newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;\r
- dev->freeObjects = newObjects;\r
- dev->nFreeObjects+= nObjects;\r
- dev->nObjectsCreated+= nObjects;\r
- \r
- // Now add this bunch of Objects to a list for freeing up.\r
- \r
- list = YMALLOC(sizeof(yaffs_ObjectList));\r
- if(!list)\r
- {\r
- T(YAFFS_TRACE_ALLOCATE,(TSTR("Could not add objects to management list" TENDSTR)));\r
- }\r
- else\r
- {\r
- list->objects = newObjects;\r
- list->next = dev->allocatedObjectList;\r
- dev->allocatedObjectList = list;\r
- }\r
- \r
- \r
- \r
- return YAFFS_OK;\r
-}\r
-\r
-\r
-// AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out\r
-static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)\r
-{\r
- yaffs_Object *tn = NULL;\r
- \r
- // If there are none left make more\r
- if(!dev->freeObjects)\r
- {\r
- yaffs_CreateFreeObjects(dev,YAFFS_ALLOCATION_NOBJECTS);\r
- }\r
- \r
- if(dev->freeObjects)\r
- {\r
- tn = dev->freeObjects;\r
- dev->freeObjects = (yaffs_Object *)(dev->freeObjects->siblings.next);\r
- dev->nFreeObjects--;\r
- \r
- // Now sweeten it up...\r
- \r
- memset(tn,0,sizeof(yaffs_Object));\r
- tn->myDev = dev;\r
- tn->chunkId = -1;\r
- tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;\r
- INIT_LIST_HEAD(&(tn->hardLinks));\r
- INIT_LIST_HEAD(&(tn->hashLink));\r
- INIT_LIST_HEAD(&tn->siblings);\r
- \r
- // Add it to the lost and found directory.\r
- // NB Can't put root or lostNFound in lostNFound so\r
- // check if lostNFound exists first\r
- if(dev->lostNFoundDir)\r
- {\r
- yaffs_AddObjectToDirectory(dev->lostNFoundDir,tn); \r
- }\r
- }\r
- \r
-\r
- return tn;\r
-}\r
-\r
-static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev,int number,__u32 mode)\r
-{\r
-\r
- yaffs_Object *obj = yaffs_CreateNewObject(dev,number,YAFFS_OBJECT_TYPE_DIRECTORY); \r
- if(obj)\r
- {\r
- obj->fake = 1; // it is fake so it has no NAND presence...\r
- obj->renameAllowed= 0; // ... and we're not allowed to rename it...\r
- obj->unlinkAllowed= 0; // ... or unlink it\r
- obj->deleted = 0;\r
- obj->unlinked = 0;\r
- obj->st_mode = mode;\r
- obj->myDev = dev;\r
- obj->chunkId = 0; // Not a valid chunk.\r
- }\r
- \r
- return obj;\r
- \r
-}\r
-\r
-\r
-static void yaffs_UnhashObject(yaffs_Object *tn)\r
-{\r
- int bucket;\r
- yaffs_Device *dev = tn->myDev;\r
- \r
- \r
- // If it is still linked into the bucket list, free from the list\r
- if(!list_empty(&tn->hashLink))\r
- {\r
- list_del_init(&tn->hashLink);\r
- bucket = yaffs_HashFunction(tn->objectId);\r
- dev->objectBucket[bucket].count--;\r
- }\r
- \r
-}\r
-\r
-\r
-// FreeObject frees up a Object and puts it back on the free list\r
-static void yaffs_FreeObject(yaffs_Object *tn)\r
-{\r
-\r
- yaffs_Device *dev = tn->myDev;\r
- \r
- yaffs_UnhashObject(tn);\r
- \r
- // Link into the free list.\r
- (yaffs_Object *)(tn->siblings.next) = dev->freeObjects;\r
- dev->freeObjects = tn;\r
- dev->nFreeObjects++;\r
-}\r
-\r
-\r
-\r
-\r
-static void yaffs_DeinitialiseObjects(yaffs_Device *dev)\r
-{\r
- // Free the list of allocated Objects\r
- \r
- while( dev->allocatedObjectList)\r
- {\r
- YFREE(dev->allocatedObjectList->objects);\r
- dev->allocatedObjectList = dev->allocatedObjectList->next;\r
- }\r
- \r
- dev->freeObjects = NULL;\r
- dev->nFreeObjects = 0;\r
-}\r
-\r
-static void yaffs_InitialiseObjects(yaffs_Device *dev)\r
-{\r
- int i;\r
- \r
- dev->allocatedObjectList = NULL;\r
- dev->freeObjects = NULL;\r
- dev->nFreeObjects = 0;\r
- \r
- for(i = 0; i < YAFFS_NOBJECT_BUCKETS; i++)\r
- {\r
- INIT_LIST_HEAD(&dev->objectBucket[i].list);\r
- dev->objectBucket[i].count = 0; \r
- }\r
-\r
-}\r
-\r
-\r
-\r
-\r
-\r
-\r
-int yaffs_FindNiceObjectBucket(yaffs_Device *dev)\r
-{\r
- static int x = 0;\r
- int i;\r
- int l = 999;\r
- int lowest = 999999;\r
-\r
- \r
- // First let's see if we can find one that's empty.\r
- \r
- for(i = 0; i < 10 && lowest > 0; i++)\r
- {\r
- x++;\r
- x %= YAFFS_NOBJECT_BUCKETS;\r
- if(dev->objectBucket[x].count < lowest)\r
- {\r
- lowest = dev->objectBucket[x].count;\r
- l = x;\r
- }\r
- \r
- }\r
- \r
- // If we didn't find an empty list, then try\r
- // looking a bit further for a short one\r
- \r
- for(i = 0; i < 10 && lowest > 3; i++)\r
- {\r
- x++;\r
- x %= YAFFS_NOBJECT_BUCKETS;\r
- if(dev->objectBucket[x].count < lowest)\r
- {\r
- lowest = dev->objectBucket[x].count;\r
- l = x;\r
- }\r
- \r
- }\r
- \r
- return l;\r
-}\r
-\r
-static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)\r
-{\r
- int bucket = yaffs_FindNiceObjectBucket(dev);\r
- \r
- // Now find an object value that has not already been taken\r
- // by scanning the list.\r
- \r
- int found = 0;\r
- struct list_head *i;\r
- \r
- __u32 n = (__u32)bucket;\r
-\r
- //yaffs_CheckObjectHashSanity(); \r
- \r
- while(!found)\r
- {\r
- found = 1;\r
- n += YAFFS_NOBJECT_BUCKETS;\r
- if(1 ||dev->objectBucket[bucket].count > 0)\r
- {\r
- list_for_each(i,&dev->objectBucket[bucket].list)\r
- {\r
- // If there is already one in the list\r
- if(list_entry(i, yaffs_Object,hashLink)->objectId == n)\r
- {\r
- found = 0;\r
- }\r
- }\r
- }\r
- }\r
- \r
- //T(("bucket %d count %d inode %d\n",bucket,yaffs_objectBucket[bucket].count,n);\r
- \r
- return n; \r
-}\r
-\r
-void yaffs_HashObject(yaffs_Object *in)\r
-{\r
- int bucket = yaffs_HashFunction(in->objectId);\r
- yaffs_Device *dev = in->myDev;\r
- \r
- if(!list_empty(&in->hashLink))\r
- {\r
- //YINFO("!!!");\r
- }\r
-\r
- \r
- list_add(&in->hashLink,&dev->objectBucket[bucket].list);\r
- dev->objectBucket[bucket].count++;\r
-\r
-}\r
-\r
-yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev,__u32 number)\r
-{\r
- int bucket = yaffs_HashFunction(number);\r
- struct list_head *i;\r
- yaffs_Object *in;\r
- \r
- list_for_each(i,&dev->objectBucket[bucket].list)\r
- {\r
- // Look if it is in the list\r
- in = list_entry(i, yaffs_Object,hashLink);\r
- if(in->objectId == number)\r
- {\r
- return in;\r
- }\r
- }\r
- \r
- return NULL;\r
-}\r
-\r
-\r
-\r
-yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev,int number,yaffs_ObjectType type)\r
-{\r
- \r
- yaffs_Object *theObject;\r
-\r
- if(number < 0)\r
- {\r
- number = yaffs_CreateNewObjectNumber(dev);\r
- }\r
- \r
- theObject = yaffs_AllocateEmptyObject(dev);\r
- \r
- if(theObject)\r
- {\r
- theObject->fake = 0;\r
- theObject->renameAllowed = 1;\r
- theObject->unlinkAllowed = 1;\r
- theObject->objectId = number;\r
- yaffs_HashObject(theObject);\r
- theObject->variantType = type;\r
-#ifdef CONFIG_YAFFS_WINCE\r
- yfsd_WinFileTimeNow(theObject->win_atime);\r
- theObject->win_ctime[0] = theObject->win_mtime[0] = theObject->win_atime[0];\r
- theObject->win_ctime[1] = theObject->win_mtime[1] = theObject->win_atime[1];\r
-\r
-#else\r
- theObject->st_atime = theObject->st_mtime = theObject->st_ctime = CURRENT_TIME;\r
-#endif\r
- switch(type)\r
- {\r
- case YAFFS_OBJECT_TYPE_FILE: \r
- theObject->variant.fileVariant.fileSize = 0;\r
- theObject->variant.fileVariant.scannedFileSize = 0;\r
- theObject->variant.fileVariant.topLevel = 0;\r
- theObject->variant.fileVariant.top = yaffs_GetTnode(dev);\r
- break;\r
- case YAFFS_OBJECT_TYPE_DIRECTORY:\r
- INIT_LIST_HEAD(&theObject->variant.directoryVariant.children);\r
- break;\r
- case YAFFS_OBJECT_TYPE_SYMLINK:\r
- // No action required\r
- break;\r
- case YAFFS_OBJECT_TYPE_HARDLINK:\r
- // No action required\r
- break;\r
- case YAFFS_OBJECT_TYPE_SPECIAL:\r
- // No action required\r
- break;\r
- case YAFFS_OBJECT_TYPE_UNKNOWN:\r
- // todo this should not happen\r
- break;\r
- }\r
- }\r
- \r
- return theObject;\r
-}\r
-\r
-yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev, int number,yaffs_ObjectType type)\r
-{\r
- yaffs_Object *theObject = NULL;\r
- \r
- if(number > 0)\r
- {\r
- theObject = yaffs_FindObjectByNumber(dev,number);\r
- }\r
- \r
- if(!theObject)\r
- {\r
- theObject = yaffs_CreateNewObject(dev,number,type);\r
- }\r
- \r
- return theObject;\r
-\r
-}\r
-\r
-char *yaffs_CloneString(const char *str)\r
-{\r
- char *newStr = NULL;\r
- \r
- if(str && *str)\r
- {\r
- newStr = YMALLOC(strlen(str) + 1);\r
- strcpy(newStr,str);\r
- }\r
-\r
- return newStr;\r
- \r
-}\r
-\r
-//\r
-// Mknod (create) a new object.\r
-// equivalentObject only has meaning for a hard link;\r
-// aliasString only has meaning for a sumlink.\r
-// rdev only has meaning for devices (a subset of special objects)\r
-yaffs_Object *yaffs_MknodObject( yaffs_ObjectType type,\r
- yaffs_Object *parent,\r
- const char *name, \r
- __u32 mode,\r
- __u32 uid,\r
- __u32 gid,\r
- yaffs_Object *equivalentObject,\r
- const char *aliasString,\r
- __u32 rdev)\r
-{\r
- yaffs_Object *in;\r
-\r
- yaffs_Device *dev = parent->myDev;\r
- \r
- // Check if the entry exists. If it does then fail the call since we don't want a dup.\r
- if(yaffs_FindObjectByName(parent,name))\r
- {\r
- return NULL;\r
- }\r
- \r
- in = yaffs_CreateNewObject(dev,-1,type);\r
- \r
- if(in)\r
- {\r
- in->chunkId = -1;\r
- in->valid = 1;\r
- in->variantType = type;\r
-\r
- in->st_mode = mode;\r
- \r
-#ifdef CONFIG_YAFFS_WINCE\r
- yfsd_WinFileTimeNow(in->win_atime);\r
- in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];\r
- in->win_ctime[1] = in->win_mtime[1] = in->win_atime[0];\r
- \r
-#else\r
- in->st_atime = in->st_mtime = in->st_ctime = CURRENT_TIME;\r
- in->st_rdev = rdev;\r
- in->st_uid = uid;\r
- in->st_gid = gid;\r
-#endif \r
- in->nDataChunks = 0;\r
-\r
- yaffs_SetObjectName(in,name);\r
- in->dirty = 1;\r
- \r
- yaffs_AddObjectToDirectory(parent,in);\r
- \r
- in->myDev = parent->myDev;\r
- \r
- \r
- switch(type)\r
- {\r
- case YAFFS_OBJECT_TYPE_SYMLINK:\r
- in->variant.symLinkVariant.alias = yaffs_CloneString(aliasString);\r
- break;\r
- case YAFFS_OBJECT_TYPE_HARDLINK:\r
- in->variant.hardLinkVariant.equivalentObject = equivalentObject;\r
- in->variant.hardLinkVariant.equivalentObjectId = equivalentObject->objectId;\r
- list_add(&in->hardLinks,&equivalentObject->hardLinks);\r
- break;\r
- case YAFFS_OBJECT_TYPE_FILE: // do nothing\r
- case YAFFS_OBJECT_TYPE_DIRECTORY: // do nothing\r
- case YAFFS_OBJECT_TYPE_SPECIAL: // do nothing\r
- case YAFFS_OBJECT_TYPE_UNKNOWN:\r
- break;\r
- }\r
-\r
- if(yaffs_GetNumberOfFreeChunks(dev) <= 0 ||\r
- yaffs_UpdateObjectHeader(in,name,0) < 0)\r
- {\r
- // Could not create the object header, fail the creation\r
- yaffs_UnlinkWorker(in);\r
- in = NULL;\r
- }\r
-\r
- }\r
- \r
- return in;\r
-}\r
-\r
-yaffs_Object *yaffs_MknodFile(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid)\r
-{\r
- return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE,parent,name,mode,uid,gid,NULL,NULL,0);\r
-}\r
-\r
-yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid)\r
-{\r
- return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY,parent,name,mode,uid,gid,NULL,NULL,0);\r
-}\r
-\r
-yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid, __u32 rdev)\r
-{\r
- return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY,parent,name,mode,uid,gid,NULL,NULL,rdev);\r
-}\r
-\r
-yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid,const char *alias)\r
-{\r
- return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK,parent,name,mode,uid,gid,NULL,alias,0);\r
-}\r
-\r
-// NB yaffs_Link returns the object id of the equivalent object.\r
-yaffs_Object *yaffs_Link(yaffs_Object *parent, const char *name, yaffs_Object *equivalentObject)\r
-{\r
- // Get the real object in case we were fed a hard link as an equivalent object\r
- equivalentObject = yaffs_GetEquivalentObject(equivalentObject);\r
- \r
- if(yaffs_MknodObject(YAFFS_OBJECT_TYPE_HARDLINK,parent,name,0,0,0,equivalentObject,NULL,0))\r
- {\r
- return equivalentObject;\r
- }\r
- else\r
- {\r
- return NULL;\r
- }\r
- \r
-}\r
-\r
-\r
-static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir, const char *newName,int force)\r
-{\r
- int unlinkOp;\r
-\r
- if(newDir == NULL)\r
- {\r
- newDir = obj->parent; // use the old directory\r
- }\r
-\r
- unlinkOp = (newDir == obj->myDev->unlinkedDir && obj->variantType == YAFFS_OBJECT_TYPE_FILE);\r
- \r
- // If the object is a file going into the unlinked directory, then it is OK to just stuff it in since\r
- // duplicate names are allowed.\r
- // Otherwise only proceed if the new name does not exist and if we're putting it into a directory.\r
- if( (unlinkOp|| \r
- force || \r
- !yaffs_FindObjectByName(newDir,newName)) &&\r
- newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)\r
- {\r
- yaffs_SetObjectName(obj,newName);\r
- obj->dirty = 1;\r
- \r
- yaffs_AddObjectToDirectory(newDir,obj);\r
- \r
- if(unlinkOp) obj->unlinked = 1;\r
- \r
- \r
- if(yaffs_UpdateObjectHeader(obj,newName,0) >= 0)\r
- {\r
- return YAFFS_OK;\r
- }\r
- }\r
- \r
- return YAFFS_FAIL;\r
-}\r
-\r
-\r
-\r
-int yaffs_RenameObject(yaffs_Object *oldDir, const char *oldName, yaffs_Object *newDir, const char *newName)\r
-{\r
- yaffs_Object *obj;\r
- int force = 0;\r
- \r
-#ifdef CONFIG_YAFFS_WINCE\r
- // Special case for WinCE.\r
- // While look-up is case insensitive, the name isn't.\r
- // THerefore we might want to change x.txt to X.txt\r
- if(oldDir == newDir && _stricmp(oldName,newName) == 0)\r
- {\r
- force = 1;\r
- } \r
-#endif\r
- \r
- obj = yaffs_FindObjectByName(oldDir,oldName);\r
- if(obj && obj->renameAllowed)\r
- {\r
- return yaffs_ChangeObjectName(obj,newDir,newName,force);\r
- }\r
- return YAFFS_FAIL;\r
-}\r
-\r
-\r
-\r
-static int yaffs_CheckObjectHashSanity(yaffs_Device *dev)\r
-{\r
- // Scan the buckets and check that the lists \r
- // have as many members as the count says there are\r
- int bucket;\r
- int countEm;\r
- struct list_head *j;\r
- int ok = YAFFS_OK;\r
- \r
- for(bucket = 0; bucket < YAFFS_NOBJECT_BUCKETS; bucket++)\r
- {\r
- countEm = 0;\r
- \r
- list_for_each(j,&dev->objectBucket[bucket].list)\r
- {\r
- countEm++;\r
- }\r
- \r
- if(countEm != dev->objectBucket[bucket].count)\r
- {\r
- T(YAFFS_TRACE_ERROR,(TSTR("Inode hash inconsistency" TENDSTR)));\r
- ok = YAFFS_FAIL;\r
- }\r
- }\r
-\r
- return ok;\r
-}\r
-\r
-#if 0\r
-void yaffs_ObjectTest(yaffs_Device *dev)\r
-{\r
- yaffs_Object *in[1000];\r
- int inNo[1000];\r
- yaffs_Object *inold[1000];\r
- int i;\r
- int j;\r
- \r
- memset(in,0,1000*sizeof(yaffs_Object *));\r
- memset(inold,0,1000*sizeof(yaffs_Object *));\r
- \r
- yaffs_CheckObjectHashSanity(dev);\r
- \r
- for(j = 0; j < 10; j++)\r
- {\r
- //T(("%d\n",j));\r
- \r
- for(i = 0; i < 1000; i++)\r
- {\r
- in[i] = yaffs_CreateNewObject(dev,-1,YAFFS_OBJECT_TYPE_FILE);\r
- if(!in[i])\r
- {\r
- YINFO("No more inodes");\r
- }\r
- else\r
- {\r
- inNo[i] = in[i]->objectId;\r
- }\r
- }\r
- \r
- for(i = 0; i < 1000; i++)\r
- {\r
- if(yaffs_FindObjectByNumber(dev,inNo[i]) != in[i])\r
- {\r
- //T(("Differnce in look up test\n"));\r
- }\r
- else\r
- {\r
- // T(("Look up ok\n"));\r
- }\r
- }\r
- \r
- yaffs_CheckObjectHashSanity(dev);\r
- \r
- for(i = 0; i < 1000; i+=3)\r
- {\r
- yaffs_FreeObject(in[i]); \r
- in[i] = NULL;\r
- }\r
- \r
- \r
- yaffs_CheckObjectHashSanity(dev);\r
- }\r
- \r
-}\r
-\r
-#endif\r
-\r
-/////////////////////////// Block Management and Page Allocation ///////////////////\r
-\r
-\r
-static int yaffs_InitialiseBlocks(yaffs_Device *dev,int nBlocks)\r
-{\r
- dev->allocationBlock = -1; // force it to get a new one\r
- //Todo we're assuming the malloc will pass.\r
- dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));\r
- if(dev->blockInfo)\r
- {\r
- memset(dev->blockInfo,0,nBlocks * sizeof(yaffs_BlockInfo));\r
- return YAFFS_OK;\r
- }\r
- return YAFFS_FAIL;\r
- \r
-}\r
-\r
-static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)\r
-{\r
- YFREE(dev->blockInfo);\r
-}\r
-\r
-// FindDiretiestBlock is used to select the dirtiest block (or close enough)\r
-// for garbage collection.\r
-\r
-static int yaffs_FindDirtiestBlock(yaffs_Device *dev)\r
-{\r
-\r
- int b = dev->currentDirtyChecker;\r
- \r
- int i;\r
- int dirtiest = -1;\r
- int pagesInUse = 100; // silly big number\r
- yaffs_BlockInfo *bi;\r
- \r
- for(i = dev->startBlock; i <= dev->endBlock && pagesInUse > 2 ; i++)\r
- {\r
- b++;\r
- if ( b < dev->startBlock || b > dev->endBlock)\r
- {\r
- b = dev->startBlock;\r
- }\r
-\r
- if(b < dev->startBlock || b > dev->endBlock)\r
- {\r
- T(YAFFS_TRACE_ERROR,(TSTR("**>> Block %d is not valid" TENDSTR),b));\r
- YBUG();\r
- }\r
- \r
- bi = yaffs_GetBlockInfo(dev,b);\r
- \r
- if(bi->blockState == YAFFS_BLOCK_STATE_FULL &&\r
- bi->pagesInUse < pagesInUse)\r
- {\r
- dirtiest = b;\r
- pagesInUse = bi->pagesInUse;\r
- }\r
- }\r
- \r
- dev->currentDirtyChecker = b;\r
- \r
- return dirtiest;\r
-}\r
-\r
-\r
-static void yaffs_BlockBecameDirty(yaffs_Device *dev,int blockNo)\r
-{\r
- yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,blockNo);\r
- \r
- int erasedOk = 0;\r
- \r
- // If the block is still healthy erase it and mark as clean.\r
- // If the block has had a data failure, then retire it.\r
- bi->blockState = YAFFS_BLOCK_STATE_DIRTY;\r
-\r
- if(!bi->needsRetiring)\r
- {\r
- erasedOk = yaffs_EraseBlockInNAND(dev,blockNo);\r
- if(!erasedOk)\r
- {\r
- T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>> Erasure failed %d" TENDSTR),blockNo));\r
- }\r
- }\r
- \r
- if( erasedOk )\r
- {\r
- bi->blockState = YAFFS_BLOCK_STATE_EMPTY;\r
- dev->nErasedBlocks++;\r
- bi->pagesInUse = 0;\r
- bi->pageBits = 0;\r
- \r
- T(YAFFS_TRACE_ERASE,(TSTR("Erased block %d" TENDSTR),blockNo));\r
- }\r
- else\r
- {\r
- yaffs_RetireBlock(dev,blockNo);\r
- T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>> Block %d retired" TENDSTR),blockNo));\r
- }\r
-}\r
-\r
-\r
-static int yaffs_FindBlockForAllocation(yaffs_Device *dev)\r
-{\r
- int i;\r
- yaffs_BlockInfo *bi;\r
- \r
- if(dev->nErasedBlocks < 1)\r
- {\r
- // Hoosterman we've got a problem.\r
- // Can't get space to gc\r
- T(YAFFS_TRACE_ERROR, (TSTR("yaffs tradgedy: no space during gc" TENDSTR)));\r
-\r
- return -1;\r
- }\r
- \r
- // Find an empty block.\r
- \r
- for(i = dev->startBlock; i <= dev->endBlock; i++)\r
- {\r
- bi = yaffs_GetBlockInfo(dev,i);\r
- if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY)\r
- {\r
- bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;\r
- dev->nErasedBlocks--; \r
- return i;\r
- }\r
- }\r
- \r
- return -1; \r
-}\r
-\r
-\r
-\r
-static int yaffs_AllocateChunk(yaffs_Device *dev,int useReserve)\r
-{\r
- int retVal;\r
- yaffs_BlockInfo *bi;\r
- \r
- if(dev->allocationBlock < 0)\r
- {\r
- // Get next block to allocate off\r
- dev->allocationBlock = yaffs_FindBlockForAllocation(dev);\r
- dev->allocationPage = 0;\r
- }\r
- \r
- if(!useReserve && dev->nErasedBlocks <= YAFFS_RESERVED_BLOCKS)\r
- {\r
- // Not enough space to allocate unless we're allowed to use the reserve.\r
- return -1;\r
- }\r
- \r
- // Next page please....\r
- if(dev->allocationBlock >= 0)\r
- {\r
- bi = yaffs_GetBlockInfo(dev,dev->allocationBlock);\r
- \r
- retVal = (dev->allocationBlock * YAFFS_CHUNKS_PER_BLOCK) + \r
- dev->allocationPage;\r
- bi->pagesInUse++;\r
- bi->pageBits |= (1 << (dev->allocationPage));\r
-\r
- dev->allocationPage++;\r
- \r
- dev->nFreeChunks--;\r
- \r
- // If the block is full set the state to full\r
- if(dev->allocationPage >= YAFFS_CHUNKS_PER_BLOCK)\r
- {\r
- bi->blockState = YAFFS_BLOCK_STATE_FULL;\r
- dev->allocationBlock = -1;\r
- }\r
-\r
-\r
- return retVal;\r
- \r
- }\r
- T(YAFFS_TRACE_ERROR,(TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));\r
-\r
- return -1; \r
-}\r
-\r
-// To determine if we have enough space we just look at the \r
-// number of erased blocks.\r
-// The cache is allowed to use reserved blocks.\r
-\r
-int yaffs_CheckSpaceForChunkCache(yaffs_Device *dev)\r
-{\r
- return (dev->nErasedBlocks >= YAFFS_RESERVED_BLOCKS);\r
-}\r
-\r
-\r
-int yaffs_GarbageCollectBlock(yaffs_Device *dev,int block)\r
-{\r
- int oldChunk;\r
- int newChunk;\r
- __u32 mask;\r
- \r
- \r
- yaffs_Spare spare;\r
- yaffs_Tags tags;\r
- __u8 buffer[YAFFS_BYTES_PER_CHUNK];\r
- \r
- yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,block);\r
- \r
- yaffs_Object *object;\r
-\r
- //T(("Collecting block %d n %d bits %x\n",block, bi->pagesInUse, bi->pageBits)); \r
- \r
- for(mask = 1,oldChunk = block * YAFFS_CHUNKS_PER_BLOCK; \r
- mask && bi->pageBits;\r
- mask <<= 1, oldChunk++ )\r
- {\r
- if(bi->pageBits & mask)\r
- {\r
- \r
- // This page is in use and needs to be copied off\r
- \r
- dev->nGCCopies++;\r
- \r
- //T(("copying page %x from %d to %d\n",mask,oldChunk,newChunk));\r
- \r
- yaffs_ReadChunkFromNAND(dev,oldChunk,buffer, &spare,1);\r
- \r
- yaffs_GetTagsFromSpare(dev,&spare,&tags);\r
-\r
- object = yaffs_FindObjectByNumber(dev,tags.objectId);\r
- \r
- if(object && object->deleted && tags.chunkId != 0)\r
- {\r
- // Data chunk in a deleted file, throw it away\r
- // It's a deleted data chunk,\r
- // No need to copy this, just forget about it and fix up the\r
- // object.\r
- \r
- yaffs_PutChunkIntoFile(object, tags.chunkId, 0,0); \r
- object->nDataChunks--;\r
- }\r
- else if( 0 /* Todo object && object->deleted && object->nDataChunks == 0 */)\r
- {\r
- // Deleted object header with no data chunks.\r
- // Can be discarded\r
- object->chunkId = 0;\r
- //Todo some clean up\r
- \r
- }\r
- else if(object)\r
- {\r
- // It's either a data chunk in a live file or\r
- // an ObjectHeader, so we're interested in it.\r
- // NB Need to keep the ObjectHeaders of deleted files\r
- // until the whole file has been deleted off\r
- tags.serialNumber++;\r
- yaffs_LoadTagsIntoSpare(&spare,&tags);\r
-\r
-\r
- newChunk = yaffs_WriteNewChunkToNAND(dev, buffer, &spare,1);\r
- \r
- if(newChunk < 0)\r
- {\r
- return YAFFS_FAIL;\r
- }\r
- \r
- // Ok, now fix up the Tnodes etc.\r
- \r
- if(tags.chunkId == 0)\r
- {\r
- // It's a header\r
- object->chunkId = newChunk;\r
- }\r
- else\r
- {\r
- // It's a data chunk\r
- yaffs_PutChunkIntoFile(object, tags.chunkId, newChunk,0);\r
- }\r
- }\r
- \r
- yaffs_DeleteChunk(dev,oldChunk); \r
- \r
- }\r
- }\r
-\r
- return YAFFS_OK;\r
-}\r
-\r
-\r
-static yaffs_Object *yaffs_FindDeletedUnlinkedFile(yaffs_Device *dev)\r
-{\r
- // todo find a file to delete\r
- struct list_head *i; \r
- yaffs_Object *l;\r
-\r
-\r
- // To the free chunks add the chunks that are in the deleted unlinked files.\r
- list_for_each(i,&dev->unlinkedDir->variant.directoryVariant.children)\r
- {\r
- l = list_entry(i, yaffs_Object,siblings);\r
- if(l->deleted)\r
- {\r
- return l; \r
- }\r
- } \r
- return NULL;\r
-}\r
-\r
-static void yaffs_DoUnlinkedFileDeletion(yaffs_Device *dev)\r
-{\r
- // This does background deletion on unlinked files.. only deleted ones.\r
- // If we don't have a file we're working on then find one\r
- if(!dev->unlinkedDeletion && dev->nDeletedFiles > 0)\r
- {\r
- dev->unlinkedDeletion = yaffs_FindDeletedUnlinkedFile(dev);\r
- }\r
- \r
- // OK, we're working on a file...\r
- if(dev->unlinkedDeletion)\r
- {\r
- yaffs_Object *obj = dev->unlinkedDeletion;\r
- int delresult;\r
- int limit; // Number of chunks to delete in a file.\r
- // NB this can be exceeded, but not by much.\r
- \r
- limit = 5;\r
-#if 0 \r
- if(dev->nErasedBlocks <= (YAFFS_RESERVED_BLOCKS + YAFFS_GARBAGE_COLLECT_LOW_WATER))\r
- {\r
- limit = 50; // Doing GC soon, so dig deeper \r
- }\r
- else\r
- {\r
- limit = 5;\r
- }\r
-#endif\r
- \r
- delresult = yaffs_DeleteWorker(obj, obj->variant.fileVariant.top, obj->variant.fileVariant.topLevel, 0,&limit);\r
- \r
- if(obj->nDataChunks == 0)\r
- {\r
- // Done all the deleting of data chunks.\r
- // Now dump the header and clean up\r
- yaffs_FreeTnode(dev,obj->variant.fileVariant.top);\r
- yaffs_DoGenericObjectDeletion(obj);\r
- dev->nDeletedFiles--;\r
- dev->nUnlinkedFiles--;\r
- dev->nBackgroundDeletions++;\r
- dev->unlinkedDeletion = NULL; \r
- }\r
- }\r
-}\r
-\r
-\r
-\r
-static int yaffs_CheckGarbageCollection(yaffs_Device *dev)\r
-{\r
- int block;\r
- \r
- yaffs_DoUnlinkedFileDeletion(dev);\r
- \r
- if(dev->nErasedBlocks <= (YAFFS_RESERVED_BLOCKS + YAFFS_GARBAGE_COLLECT_LOW_WATER))\r
- {\r
- dev->garbageCollectionRequired = 1;\r
- } \r
- \r
- if(dev->garbageCollectionRequired)\r
- {\r
- dev->garbageCollections++;\r
- dev->garbageCollectionRequired = 0;\r
- if(dev->blockSelectedForGC >= 0)\r
- {\r
- block = dev->blockSelectedForGC;\r
- }\r
- else\r
- {\r
- block = yaffs_FindDirtiestBlock(dev);\r
- }\r
- \r
- if(block >= 0)\r
- {\r
- return yaffs_GarbageCollectBlock(dev,block);\r
- } \r
- else\r
- {\r
- return YAFFS_FAIL;\r
- }\r
- }\r
-\r
- return YAFFS_OK;\r
-}\r
-\r
-\r
-//////////////////////////// TAGS ///////////////////////////////////////\r
-\r
-static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr)\r
-{\r
- yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr;\r
- \r
- yaffs_CalcTagsECC(tagsPtr);\r
- \r
- sparePtr->tagByte0 = tu->asBytes[0];\r
- sparePtr->tagByte1 = tu->asBytes[1];\r
- sparePtr->tagByte2 = tu->asBytes[2];\r
- sparePtr->tagByte3 = tu->asBytes[3];\r
- sparePtr->tagByte4 = tu->asBytes[4];\r
- sparePtr->tagByte5 = tu->asBytes[5];\r
- sparePtr->tagByte6 = tu->asBytes[6];\r
- sparePtr->tagByte7 = tu->asBytes[7];\r
-}\r
-\r
-static void yaffs_GetTagsFromSpare(yaffs_Device *dev, yaffs_Spare *sparePtr,yaffs_Tags *tagsPtr)\r
-{\r
- yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr;\r
- int result;\r
-\r
- tu->asBytes[0]= sparePtr->tagByte0;\r
- tu->asBytes[1]= sparePtr->tagByte1;\r
- tu->asBytes[2]= sparePtr->tagByte2;\r
- tu->asBytes[3]= sparePtr->tagByte3;\r
- tu->asBytes[4]= sparePtr->tagByte4;\r
- tu->asBytes[5]= sparePtr->tagByte5;\r
- tu->asBytes[6]= sparePtr->tagByte6;\r
- tu->asBytes[7]= sparePtr->tagByte7;\r
- \r
- result = yaffs_CheckECCOnTags(tagsPtr);\r
- if(result> 0)\r
- {\r
- dev->tagsEccFixed++;\r
- }\r
- else if(result <0)\r
- {\r
- dev->tagsEccUnfixed++;\r
- }\r
-}\r
-\r
-static void yaffs_SpareInitialise(yaffs_Spare *spare)\r
-{\r
- memset(spare,0xFF,sizeof(yaffs_Spare));\r
-}\r
-\r
-static int yaffs_ReadChunkTagsFromNAND(yaffs_Device *dev,int chunkInNAND, yaffs_Tags *tags, int *chunkDeleted)\r
-{\r
- if(tags)\r
- {\r
- yaffs_Spare spare;\r
- if(yaffs_ReadChunkFromNAND(dev,chunkInNAND,NULL,&spare,1) == YAFFS_OK)\r
- {\r
- *chunkDeleted = (yaffs_CountBits(spare.pageStatus) < 7) ? 1 : 0;\r
- yaffs_GetTagsFromSpare(dev,&spare,tags);\r
- return YAFFS_OK;\r
- }\r
- else\r
- {\r
- return YAFFS_FAIL;\r
- }\r
- }\r
- \r
- return YAFFS_OK;\r
-}\r
-\r
-#if 0\r
-static int yaffs_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND, const __u8 *buffer, yaffs_Tags *tags)\r
-{\r
- // NB There must be tags, data is optional\r
- // If there is data, then an ECC is calculated on it.\r
- \r
- yaffs_Spare spare;\r
- \r
- if(!tags)\r
- {\r
- return YAFFS_FAIL;\r
- }\r
- \r
- yaffs_SpareInitialise(&spare);\r
- \r
-\r
- if(buffer)\r
- {\r
- yaffs_CalcECC(buffer,&spare);\r
- }\r
- \r
- yaffs_LoadTagsIntoSpare(&spare,tags);\r
- \r
- return yaffs_WriteChunkToNAND(dev,chunkInNAND,buffer,&spare);\r
- \r
-}\r
-#endif\r
-\r
-\r
-static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev, const __u8 *buffer, yaffs_Tags *tags, int useReserve)\r
-{\r
- // NB There must be tags, data is optional\r
- // If there is data, then an ECC is calculated on it.\r
- \r
- yaffs_Spare spare;\r
- \r
- if(!tags)\r
- {\r
- return YAFFS_FAIL;\r
- }\r
- \r
- yaffs_SpareInitialise(&spare);\r
- \r
-\r
- if(buffer)\r
- {\r
- yaffs_CalcECC(buffer,&spare);\r
- }\r
- \r
- yaffs_LoadTagsIntoSpare(&spare,tags);\r
- \r
- return yaffs_WriteNewChunkToNAND(dev,buffer,&spare,useReserve);\r
- \r
-}\r
-\r
-static int yaffs_TagsMatch(const yaffs_Tags *tags, int objectId, int chunkInObject, int chunkDeleted)\r
-{\r
- return ( tags->chunkId == chunkInObject &&\r
- tags->objectId == objectId &&\r
- !chunkDeleted) ? 1 : 0;\r
- \r
-}\r
-\r
-\r
-\r
-int yaffs_FindChunkInFile(yaffs_Object *in,int chunkInInode,yaffs_Tags *tags)\r
-{\r
- //Get the Tnode, then get the level 0 offset chunk offset\r
- yaffs_Tnode *tn; \r
- int theChunk = -1;\r
- yaffs_Tags localTags;\r
- int i;\r
- int found = 0;\r
- int chunkDeleted;\r
- \r
- yaffs_Device *dev = in->myDev;\r
- \r
- \r
- if(!tags)\r
- {\r
- // Passed a NULL, so use our own tags space\r
- tags = &localTags;\r
- }\r
- \r
- tn = yaffs_FindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode);\r
- \r
- if(tn)\r
- {\r
- theChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->chunkGroupBits;\r
-\r
- // Now we need to do the shifting etc and search for it\r
- for(i = 0,found = 0; theChunk && i < dev->chunkGroupSize && !found; i++)\r
- {\r
- yaffs_ReadChunkTagsFromNAND(dev,theChunk,tags,&chunkDeleted);\r
- if(yaffs_TagsMatch(tags,in->objectId,chunkInInode,chunkDeleted))\r
- {\r
- // found it;\r
- found = 1;\r
- }\r
- else\r
- {\r
- theChunk++;\r
- }\r
- }\r
- }\r
- return found ? theChunk : -1;\r
-}\r
-\r
-int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in,int chunkInInode,yaffs_Tags *tags)\r
-{\r
- //Get the Tnode, then get the level 0 offset chunk offset\r
- yaffs_Tnode *tn; \r
- int theChunk = -1;\r
- yaffs_Tags localTags;\r
- int i;\r
- int found = 0;\r
- yaffs_Device *dev = in->myDev;\r
- int chunkDeleted;\r
- \r
- if(!tags)\r
- {\r
- // Passed a NULL, so use our own tags space\r
- tags = &localTags;\r
- }\r
- \r
- tn = yaffs_FindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode);\r
- \r
- if(tn)\r
- {\r
- \r
- theChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->chunkGroupBits;\r
- \r
- // Now we need to do the shifting etc and search for it\r
- for(i = 0,found = 0; theChunk && i < dev->chunkGroupSize && !found; i++)\r
- {\r
- yaffs_ReadChunkTagsFromNAND(dev,theChunk,tags,&chunkDeleted);\r
- if(yaffs_TagsMatch(tags,in->objectId,chunkInInode,chunkDeleted))\r
- {\r
- // found it;\r
- found = 1;\r
- }\r
- else\r
- {\r
- theChunk++;\r
- }\r
- }\r
- \r
- // Delete the entry in the filestructure\r
- if(found)\r
- {\r
- tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = 0;\r
- }\r
- }\r
- else\r
- {\r
- //T(("No level 0 found for %d\n", chunkInInode));\r
- }\r
- \r
- if(!found)\r
- {\r
- //T(("Could not find %d to delete\n",chunkInInode));\r
- }\r
- return found ? theChunk : -1;\r
-}\r
-\r
-\r
-#ifdef YAFFS_PARANOID\r
-\r
-static int yaffs_CheckFileSanity(yaffs_Object *in)\r
-{\r
- int chunk;\r
- int nChunks;\r
- int fSize;\r
- int failed = 0;\r
- int objId;\r
- yaffs_Tnode *tn;\r
- yaffs_Tags localTags;\r
- yaffs_Tags *tags = &localTags;\r
- int theChunk;\r
- int chunkDeleted;\r
- \r
- \r
- if(in->variantType != YAFFS_OBJECT_TYPE_FILE)\r
- {\r
- //T(("Object not a file\n"));\r
- return YAFFS_FAIL;\r
- }\r
- \r
- objId = in->objectId;\r
- fSize = in->variant.fileVariant.fileSize;\r
- nChunks = (fSize + YAFFS_BYTES_PER_CHUNK -1)/YAFFS_BYTES_PER_CHUNK;\r
- \r
- for(chunk = 1; chunk <= nChunks; chunk++)\r
- {\r
- tn = yaffs_FindLevel0Tnode(in->myDev,&in->variant.fileVariant, chunk);\r
- \r
- if(tn)\r
- {\r
- \r
- theChunk = tn->level0[chunk & YAFFS_TNODES_LEVEL0_MASK] << in->myDev->chunkGroupBits;\r
- \r
-\r
- yaffs_ReadChunkTagsFromNAND(in->myDev,theChunk,tags,&chunkDeleted);\r
- if(yaffs_TagsMatch(tags,in->objectId,chunk,chunkDeleted))\r
- {\r
- // found it;\r
- \r
- }\r
- else\r
- {\r
- //T(("File problem file [%d,%d] NAND %d tags[%d,%d]\n",\r
- // objId,chunk,theChunk,tags->chunkId,tags->objectId);\r
- \r
- failed = 1;\r
- \r
- }\r
- \r
- }\r
- else\r
- {\r
- //T(("No level 0 found for %d\n", chunk));\r
- }\r
- }\r
- \r
- return failed ? YAFFS_FAIL : YAFFS_OK;\r
-}\r
-\r
-#endif\r
-\r
-static int yaffs_PutChunkIntoFile(yaffs_Object *in,int chunkInInode, int chunkInNAND, int inScan)\r
-{\r
- yaffs_Tnode *tn;\r
- yaffs_Device *dev = in->myDev;\r
- int existingChunk;\r
- yaffs_Tags existingTags;\r
- yaffs_Tags newTags;\r
- unsigned existingSerial, newSerial;\r
- \r
- int newChunkDeleted;\r
- \r
- \r
- tn = yaffs_AddOrFindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode);\r
- if(!tn)\r
- {\r
- return YAFFS_FAIL;\r
- }\r
-\r
- existingChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK]; \r
- \r
- if(inScan)\r
- {\r
- // If we're scanning then we need to test for duplicates\r
- // NB This does not need to be efficient since it should only ever \r
- // happen when the power fails during a write, then only one\r
- // chunk should ever be affected.\r
- \r
- \r
- if(existingChunk != 0)\r
- {\r
- // NB Right now existing chunk will not be real chunkId if the device >= 32MB\r
- // thus we have to do a FindChunkInFile to get the real chunk id.\r
- //\r
- // We have a duplicate now we need to decide which one to use\r
- // To do this we get both sets of tags and compare serial numbers.\r
- yaffs_ReadChunkTagsFromNAND(dev,chunkInNAND, &newTags,&newChunkDeleted);\r
- \r
- \r
- // Do a proper find\r
- existingChunk = yaffs_FindChunkInFile(in,chunkInInode, &existingTags);\r
-\r
- if(existingChunk <=0)\r
- {\r
- //Hoosterman - how did this happen?\r
- \r
- T(YAFFS_TRACE_ERROR, (TSTR("yaffs tradgedy: existing chunk < 0 in scan" TENDSTR)));\r
-\r
- }\r
-\r
- \r
- // NB The deleted flags should be false, otherwise the chunks will \r
- // not be loaded during a scan\r
- \r
- newSerial = newTags.serialNumber;\r
- existingSerial = existingTags.serialNumber;\r
- \r
- if( existingChunk <= 0 ||\r
- ((existingSerial+1) & 3) == newSerial)\r
- {\r
- // Use new\r
- // Delete the old one and drop through to update the tnode\r
- yaffs_DeleteChunk(dev,existingChunk);\r
- }\r
- else\r
- {\r
- // Use existing.\r
- // Delete the new one and return early so that the tnode isn't changed\r
- yaffs_DeleteChunk(dev,chunkInNAND);\r
- return YAFFS_OK;\r
- }\r
- }\r
-\r
- }\r
- \r
- if(existingChunk == 0)\r
- {\r
- in->nDataChunks++;\r
- }\r
- \r
- tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = (chunkInNAND >> dev->chunkGroupBits);\r
- \r
- return YAFFS_OK;\r
-}\r
-\r
-\r
-\r
-int yaffs_ReadChunkDataFromObject(yaffs_Object *in,int chunkInInode, __u8 *buffer)\r
-{\r
- int chunkInNAND = yaffs_FindChunkInFile(in,chunkInInode,NULL);\r
- \r
- if(chunkInNAND >= 0)\r
- {\r
- return yaffs_ReadChunkFromNAND(in->myDev,chunkInNAND,buffer,NULL,1);\r
- }\r
- else\r
- {\r
- return 0;\r
- }\r
-\r
-}\r
-\r
-\r
-static void yaffs_DeleteChunk(yaffs_Device *dev,int chunkId)\r
-{\r
- int block;\r
- int page;\r
- yaffs_Spare spare;\r
- yaffs_BlockInfo *bi;\r
- \r
- if(chunkId <= 0) return; \r
- \r
- block = chunkId / YAFFS_CHUNKS_PER_BLOCK;\r
- page = chunkId % YAFFS_CHUNKS_PER_BLOCK;\r
- yaffs_SpareInitialise(&spare);\r
- \r
- spare.pageStatus = 0; // To mark it as deleted.\r
-\r
- \r
- yaffs_WriteChunkToNAND(dev,chunkId,NULL,&spare);\r
- yaffs_HandleUpdateChunk(dev,chunkId,&spare);\r
- bi = yaffs_GetBlockInfo(dev,block);\r
- \r
- \r
- // Pull out of the management area.\r
- // If the whole block became dirty, this will kick off an erasure.\r
- if( bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||\r
- bi->blockState == YAFFS_BLOCK_STATE_FULL)\r
- {\r
- dev->nFreeChunks++;\r
-\r
- bi->pageBits &= ~(1 << page);\r
- bi->pagesInUse--;\r
- \r
- if(bi->pagesInUse == 0 &&\r
- bi->blockState == YAFFS_BLOCK_STATE_FULL)\r
- {\r
- yaffs_BlockBecameDirty(dev,block);\r
- }\r
-\r
- }\r
- else\r
- {\r
- // T(("Bad news deleting chunk %d\n",chunkId));\r
- }\r
- \r
-}\r
-\r
-\r
-\r
-\r
-int yaffs_WriteChunkDataToObject(yaffs_Object *in,int chunkInInode, const __u8 *buffer,int nBytes,int useReserve)\r
-{\r
- // Find old chunk Need to do this to get serial number\r
- // Write new one and patch into tree.\r
- // Invalidate old tags.\r
-\r
- int prevChunkId;\r
- yaffs_Tags prevTags;\r
- \r
- int newChunkId;\r
- yaffs_Tags newTags;\r
-\r
- yaffs_Device *dev = in->myDev; \r
-\r
- yaffs_CheckGarbageCollection(dev);\r
-\r
- // Get the previous chunk at this location in the file if it exists\r
- prevChunkId = yaffs_FindChunkInFile(in,chunkInInode,&prevTags);\r
- \r
- // Set up new tags\r
- newTags.chunkId = chunkInInode;\r
- newTags.objectId = in->objectId;\r
- newTags.serialNumber = (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;\r
- newTags.byteCount = nBytes;\r
- newTags.unusedStuff = 0xFFFFFFFF;\r
- \r
- yaffs_CalcTagsECC(&newTags);\r
-\r
- newChunkId = yaffs_WriteNewChunkWithTagsToNAND(dev,buffer,&newTags,useReserve);\r
- if(newChunkId >= 0)\r
- {\r
- yaffs_PutChunkIntoFile(in,chunkInInode,newChunkId,0);\r
- \r
- \r
- if(prevChunkId >= 0)\r
- {\r
- yaffs_DeleteChunk(dev,prevChunkId);\r
- \r
- }\r
- \r
- yaffs_CheckFileSanity(in);\r
- }\r
- return newChunkId;\r
-\r
-\r
-\r
-\r
-\r
-}\r
-\r
-\r
-// UpdateObjectHeader updates the header on NAND for an object.\r
-// If name is not NULL, then that new name is used.\r
-//\r
-int yaffs_UpdateObjectHeader(yaffs_Object *in,const char *name, int force)\r
-{\r
-\r
- yaffs_Device *dev = in->myDev;\r
- \r
- int prevChunkId;\r
- \r
- int newChunkId;\r
- yaffs_Tags newTags;\r
- __u8 bufferNew[YAFFS_BYTES_PER_CHUNK];\r
- __u8 bufferOld[YAFFS_BYTES_PER_CHUNK];\r
- \r
- yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)bufferNew;\r
- yaffs_ObjectHeader *ohOld = (yaffs_ObjectHeader *)bufferOld;\r
-\r
- \r
- if(!in->fake || force)\r
- {\r
- \r
- yaffs_CheckGarbageCollection(dev); \r
- \r
- memset(bufferNew,0xFF,YAFFS_BYTES_PER_CHUNK);\r
- \r
- prevChunkId = in->chunkId;\r
- \r
- if(prevChunkId >= 0)\r
- {\r
- yaffs_ReadChunkFromNAND(dev,prevChunkId,bufferOld,NULL,1); \r
- }\r
-\r
- // Header data\r
- oh->type = in->variantType;\r
- \r
- oh->st_mode = in->st_mode;\r
-\r
-#ifdef CONFIG_YAFFS_WINCE\r
- oh->win_atime[0] = in->win_atime[0];\r
- oh->win_ctime[0] = in->win_ctime[0];\r
- oh->win_mtime[0] = in->win_mtime[0];\r
- oh->win_atime[1] = in->win_atime[1];\r
- oh->win_ctime[1] = in->win_ctime[1];\r
- oh->win_mtime[1] = in->win_mtime[1];\r
-#else\r
- oh->st_uid = in->st_uid;\r
- oh->st_gid = in->st_gid;\r
- oh->st_atime = in->st_atime;\r
- oh->st_mtime = in->st_mtime;\r
- oh->st_ctime = in->st_ctime;\r
- oh->st_rdev = in->st_rdev;\r
-#endif \r
- if(in->parent)\r
- {\r
- oh->parentObjectId = in->parent->objectId;\r
- }\r
- else\r
- {\r
- oh->parentObjectId = 0;\r
- }\r
- \r
- //oh->sum = in->sum;\r
- if(name && *name)\r
- {\r
- memset(oh->name,0,YAFFS_MAX_NAME_LENGTH + 1);\r
- strncpy(oh->name,name,YAFFS_MAX_NAME_LENGTH);\r
- }\r
- else if(prevChunkId)\r
- { \r
- memcpy(oh->name, ohOld->name,YAFFS_MAX_NAME_LENGTH + 1);\r
- }\r
- else\r
- {\r
- memset(oh->name,0,YAFFS_MAX_NAME_LENGTH + 1); \r
- }\r
- \r
- switch(in->variantType)\r
- {\r
- case YAFFS_OBJECT_TYPE_UNKNOWN: \r
- // Should not happen\r
- break;\r
- case YAFFS_OBJECT_TYPE_FILE:\r
- oh->fileSize = in->variant.fileVariant.fileSize;\r
- break;\r
- case YAFFS_OBJECT_TYPE_HARDLINK:\r
- oh->equivalentObjectId = in->variant.hardLinkVariant.equivalentObjectId;\r
- break;\r
- case YAFFS_OBJECT_TYPE_SPECIAL: \r
- // Do nothing\r
- break;\r
- case YAFFS_OBJECT_TYPE_DIRECTORY: \r
- // Do nothing\r
- break;\r
- case YAFFS_OBJECT_TYPE_SYMLINK:\r
- strncpy(oh->alias,in->variant.symLinkVariant.alias,YAFFS_MAX_ALIAS_LENGTH);\r
- oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;\r
- break;\r
- }\r
-\r
- // Tags\r
- in->serial++;\r
- newTags.chunkId = 0;\r
- newTags.objectId = in->objectId;\r
- newTags.serialNumber = in->serial;\r
- newTags.byteCount = 0xFFFFFFFF;\r
- newTags.unusedStuff = 0xFFFFFFFF;\r
- \r
- yaffs_CalcTagsECC(&newTags);\r
- \r
-\r
- // Create new chunk in NAND\r
- newChunkId = yaffs_WriteNewChunkWithTagsToNAND(dev,bufferNew,&newTags,1);\r
- \r
- if(newChunkId >= 0)\r
- {\r
- \r
- in->chunkId = newChunkId; \r
- \r
- if(prevChunkId >= 0)\r
- {\r
- yaffs_DeleteChunk(dev,prevChunkId);\r
- }\r
- \r
- in->dirty = 0;\r
- }\r
- \r
- return newChunkId;\r
-\r
- }\r
- return 0;\r
-}\r
-\r
-\r
-/////////////////////// Short Operations Cache ////////////////////////////////\r
-// In many siturations where there is no high level buffering (eg WinCE) a lot of\r
-// reads might be short sequential reads, and a lot of writes may be short \r
-// sequential writes. eg. scanning/writing a jpeg file.\r
-// In these cases, a short read/write cache can provide a huge perfomance benefit \r
-// with dumb-as-a-rock code.\r
-// There are a limited number (~10) of cache chunks per device so that we don't\r
-// need a very intelligent search.\r
-\r
-\r
-#ifdef CONFIG_YAFFS_SHORT_OP_CACHE\r
-\r
-\r
-static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)\r
-{\r
- yaffs_Device *dev = obj->myDev;\r
- int lowest;\r
- int i;\r
- yaffs_ChunkCache *cache;\r
- int chunkWritten;\r
- int nBytes;\r
- \r
- do{\r
- cache = NULL;\r
- \r
- // Find the dirty cache for this object with the lowest chunk id.\r
- for(i = 0; i < YAFFS_N_CACHE_CHUNKS; i++)\r
- {\r
- if(dev->srCache[i].object == obj &&\r
- dev->srCache[i].dirty)\r
- {\r
- if(!cache || dev->srCache[i].chunkId < lowest)\r
- {\r
- cache = &dev->srCache[i];\r
- lowest = cache->chunkId;\r
- }\r
- }\r
- }\r
- \r
- if(cache)\r
- {\r
- //Write it out\r
-\r
- nBytes = cache->object->variant.fileVariant.fileSize - ((cache->chunkId -1) * YAFFS_BYTES_PER_CHUNK);\r
- \r
- if(nBytes > YAFFS_BYTES_PER_CHUNK)\r
- {\r
- nBytes= YAFFS_BYTES_PER_CHUNK;\r
- }\r
- \r
- chunkWritten = yaffs_WriteChunkDataToObject(cache->object,\r
- cache->chunkId,\r
- cache->data,\r
- nBytes,1);\r
-\r
- cache->dirty = 0;\r
- }\r
- \r
- } while(cache && chunkWritten > 0);\r
- \r
- if(cache)\r
- {\r
- //Hoosterman, disk full while writing cache out.\r
- T(YAFFS_TRACE_ERROR, (TSTR("yaffs tradgedy: no space during caceh write" TENDSTR)));\r
-\r
- } \r
- \r
-}\r
-\r
-\r
-// Grab us a chunk for use.\r
-// First look for an empty one. \r
-// Then look for the least recently used non-dirty one.\r
-// Then look for the least recently used dirty one...., flush and look again.\r
-static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)\r
-{\r
- int i;\r
- int usage;\r
- int theOne;\r
- \r
- for(i = 0; i < YAFFS_N_CACHE_CHUNKS; i++)\r
- {\r
- if(!dev->srCache[i].object)\r
- {\r
- //T(("Grabbing empty %d\n",i));\r
- \r
- return &dev->srCache[i];\r
- }\r
- }\r
- \r
- theOne = -1; \r
- usage = 0; // just to stop the compiler grizzling\r
- \r
- for(i = 0; i < YAFFS_N_CACHE_CHUNKS; i++)\r
- {\r
- if(!dev->srCache[i].dirty &&\r
- ((dev->srCache[i].lastUse < usage && theOne >= 0)|| \r
- theOne < 0))\r
- {\r
- usage = dev->srCache[i].lastUse;\r
- theOne = i;\r
- }\r
- }\r
- \r
- //T(("Grabbing non-empty %d\n",theOne));\r
- return theOne >= 0 ? &dev->srCache[theOne] : NULL;\r
- \r
-}\r
-\r
-\r
-static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)\r
-{\r
- yaffs_ChunkCache *cache;\r
- yaffs_Object *theObj;\r
- int usage;\r
- int i;\r
- \r
- // Try find a non-dirty one...\r
- \r
- cache = yaffs_GrabChunkCacheWorker(dev);\r
- \r
- if(!cache)\r
- {\r
- // They were all dirty, find the last recently used object and flush\r
- // its cache, then find again.\r
- // NB what's here is not very accurate, we actually flush the object\r
- // the last recently used page.\r
- \r
- theObj = dev->srCache[0].object;\r
- usage = dev->srCache[0].lastUse;\r
- \r
- for(i = 1; i < YAFFS_N_CACHE_CHUNKS; i++)\r
- {\r
- if( dev->srCache[i].object && \r
- dev->srCache[i].lastUse < usage)\r
- {\r
- usage = dev->srCache[i].lastUse;\r
- theObj = dev->srCache[i].object;\r
- }\r
- }\r
- \r
- yaffs_FlushFilesChunkCache(theObj);\r
- \r
- // Try again\r
- cache = yaffs_GrabChunkCacheWorker(dev);\r
- }\r
- \r
- return cache;\r
-\r
-}\r
-\r
-\r
-// Find a cached chunk\r
-static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj, int chunkId)\r
-{\r
- yaffs_Device *dev = obj->myDev;\r
- int i;\r
- \r
- for(i = 0; i < YAFFS_N_CACHE_CHUNKS; i++)\r
- {\r
- if(dev->srCache[i].object == obj && \r
- dev->srCache[i].chunkId == chunkId)\r
- {\r
- dev->cacheHits++;\r
- \r
- return &dev->srCache[i];\r
- }\r
- }\r
- \r
- return NULL;\r
-}\r
-\r
-// Mark the chunk for the least recently used algorithym\r
-static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache, int isAWrite)\r
-{\r
- if( dev->srLastUse < 0 || \r
- dev->srLastUse > 100000000)\r
- {\r
- // Reset the cache usages\r
- int i;\r
- for(i = 1; i < YAFFS_N_CACHE_CHUNKS; i++)\r
- {\r
- dev->srCache[i].lastUse = 0;\r
- }\r
- dev->srLastUse = 0;\r
- }\r
-\r
- dev->srLastUse++;\r
- \r
- cache->lastUse = dev->srLastUse;\r
-\r
- if(isAWrite)\r
- {\r
- cache->dirty = 1;\r
- }\r
-}\r
-\r
-// Invalidate a single cache page.\r
-// Do this when a whole page gets written,\r
-// ie the short cache for this page is no longer valid.\r
-static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)\r
-{\r
- yaffs_ChunkCache *cache = yaffs_FindChunkCache(object,chunkId);\r
-\r
- if(cache)\r
- {\r
- cache->object = NULL;\r
- }\r
-}\r
-\r
-\r
-// Invalidate all the cache pages associated with this object\r
-// Do this whenever ther file is deleted or resized.\r
-static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)\r
-{\r
- int i;\r
- yaffs_Device *dev = in->myDev;\r
- \r
- // Now invalidate it.\r
- for(i = 0; i < YAFFS_N_CACHE_CHUNKS; i++)\r
- {\r
- if(dev->srCache[i].object == in)\r
- {\r
- dev->srCache[i].object = NULL;\r
- }\r
- }\r
-}\r
-\r
-\r
-#else\r
-\r
-static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)\r
-{\r
- return NULL; \r
-}\r
-\r
-\r
-static yaffs_ChunkCache *yaffs_FindChunkCache(yaffs_Device *dev, int objectId, int chunkId)\r
-{\r
- return NULL;\r
-}\r
-\r
-static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache)\r
-{\r
-}\r
-\r
-static void yaffs_InvalidateChunkCache(yaffs_Object *obj, int chunkId)\r
-{\r
-}\r
-\r
-static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)\r
-{\r
-}\r
-\r
-\r
-\r
-#endif\r
-\r
-\r
-\r
-///////////////////////// File read/write ///////////////////////////////\r
-// Read and write have very similar structures.\r
-// In general the read/write has three parts to it\r
-// * An incomplete chunk to start with (if the read/write is not chunk-aligned)\r
-// * Some complete chunks\r
-// * An incomplete chunk to end off with\r
-//\r
-// Curve-balls: the first chunk might also be the last chunk.\r
-\r
-int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 * buffer, __u32 offset, int nBytes)\r
-{\r
- \r
- \r
- int chunk;\r
- int start;\r
- int nToCopy;\r
- int n = nBytes;\r
- int nDone = 0;\r
- \r
- while(n > 0)\r
- {\r
- chunk = offset / YAFFS_BYTES_PER_CHUNK + 1; // The first chunk is 1\r
- start = offset % YAFFS_BYTES_PER_CHUNK;\r
-\r
- // OK now check for the curveball where the start and end are in\r
- // the same chunk. \r
- if( (start + n) < YAFFS_BYTES_PER_CHUNK)\r
- {\r
- nToCopy = n;\r
- }\r
- else\r
- {\r
- nToCopy = YAFFS_BYTES_PER_CHUNK - start;\r
- }\r
- \r
- if(nToCopy != YAFFS_BYTES_PER_CHUNK)\r
- {\r
- // An incomplete start or end chunk (or maybe both start and end chunk)\r
-#ifdef CONFIG_YAFFS_SHORT_OP_CACHE\r
- yaffs_ChunkCache *cache;\r
- // If we can't find the data in the cache, then load it up.\r
- cache = yaffs_FindChunkCache(in,chunk);\r
- if(!cache)\r
- {\r
- cache = yaffs_GrabChunkCache(in->myDev);\r
- cache->object = in;\r
- cache->chunkId = chunk;\r
- cache->dirty = 0;\r
- yaffs_ReadChunkDataFromObject(in,chunk,cache->data); \r
- }\r
- \r
- yaffs_UseChunkCache(in->myDev,cache,0);\r
-\r
- memcpy(buffer,&cache->data[start],nToCopy);\r
-#else\r
- __u8 localBuffer[YAFFS_BYTES_PER_CHUNK];\r
- // Read into the local buffer then copy...\r
- yaffs_ReadChunkDataFromObject(in,chunk,localBuffer); \r
- memcpy(buffer,&localBuffer[start],nToCopy);\r
-#endif\r
- }\r
- else\r
- {\r
-#ifdef CONFIG_YAFFS_WINCE\r
- __u8 localBuffer[YAFFS_BYTES_PER_CHUNK];\r
- \r
- // Under WinCE can't do direct transfer. Need to use a local buffer.\r
- // This is because we otherwise screw up WinCE's memory mapper\r
- yaffs_ReadChunkDataFromObject(in,chunk,localBuffer);\r
- memcpy(buffer,localBuffer,YAFFS_BYTES_PER_CHUNK);\r
-#else\r
- // A full chunk. Read directly into the supplied buffer.\r
- yaffs_ReadChunkDataFromObject(in,chunk,buffer);\r
-#endif\r
- }\r
- \r
- n -= nToCopy;\r
- offset += nToCopy;\r
- buffer += nToCopy;\r
- nDone += nToCopy;\r
- \r
- }\r
- \r
- return nDone;\r
-}\r
-\r
-\r
-\r
-int yaffs_WriteDataToFile(yaffs_Object *in,const __u8 * buffer, __u32 offset, int nBytes)\r
-{ \r
- \r
- int chunk;\r
- int start;\r
- int nToCopy;\r
- int n = nBytes;\r
- int nDone = 0;\r
- int nToWriteBack;\r
- int startOfWrite = offset;\r
- int chunkWritten = 0;\r
- int nBytesRead;\r
- \r
- \r
- \r
- while(n > 0 && chunkWritten >= 0)\r
- {\r
- chunk = offset / YAFFS_BYTES_PER_CHUNK + 1;\r
- start = offset % YAFFS_BYTES_PER_CHUNK;\r
- \r
-\r
- // OK now check for the curveball where the start and end are in\r
- // the same chunk.\r
- \r
- if( (start + n) < YAFFS_BYTES_PER_CHUNK)\r
- {\r
- nToCopy = n;\r
- \r
- // Now folks, to calculate how many bytes to write back....\r
- // If we're overwriting and not writing to then end of file then\r
- // we need to write back as much as was there before.\r
- \r
- nBytesRead = in->variant.fileVariant.fileSize - ((chunk -1) * YAFFS_BYTES_PER_CHUNK);\r
- \r
- if(nBytesRead > YAFFS_BYTES_PER_CHUNK)\r
- {\r
- nBytesRead = YAFFS_BYTES_PER_CHUNK;\r
- }\r
- \r
- nToWriteBack = (nBytesRead > (start + n)) ? nBytesRead : (start +n);\r
- \r
- }\r
- else\r
- {\r
- nToCopy = YAFFS_BYTES_PER_CHUNK - start;\r
- nToWriteBack = YAFFS_BYTES_PER_CHUNK;\r
- }\r
- \r
- if(nToCopy != YAFFS_BYTES_PER_CHUNK)\r
- {\r
- // An incomplete start or end chunk (or maybe both start and end chunk)\r
-#ifdef CONFIG_YAFFS_SHORT_OP_CACHE\r
- yaffs_ChunkCache *cache;\r
- // If we can't find the data in the cache, then load it up.\r
- cache = yaffs_FindChunkCache(in,chunk);\r
- if(!cache && yaffs_CheckSpaceForChunkCache(in->myDev))\r
- {\r
- cache = yaffs_GrabChunkCache(in->myDev);\r
- cache->object = in;\r
- cache->chunkId = chunk;\r
- cache->dirty = 0;\r
- yaffs_ReadChunkDataFromObject(in,chunk,cache->data); \r
- }\r
- \r
- if(cache)\r
- { \r
- yaffs_UseChunkCache(in->myDev,cache,1);\r
- memcpy(&cache->data[start],buffer,nToCopy);\r
- }\r
- else\r
- {\r
- chunkWritten = -1; // fail the write\r
- }\r
-#else\r
- __u8 localBuffer[YAFFS_BYTES_PER_CHUNK];\r
-\r
- // An incomplete start or end chunk (or maybe both start and end chunk)\r
- // Read into the local buffer then copy, then copy over and write back.\r
- \r
- yaffs_ReadChunkDataFromObject(in,chunk,localBuffer);\r
- \r
- memcpy(&localBuffer[start],buffer,nToCopy);\r
- \r
- chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,localBuffer,nToWriteBack,0);\r
- \r
- //T(("Write with readback to chunk %d %d start %d copied %d wrote back %d\n",chunk,chunkWritten,start, nToCopy, nToWriteBack));\r
-#endif\r
- \r
- }\r
- else\r
- {\r
- \r
-#ifdef CONFIG_YAFFS_WINCE\r
- __u8 localBuffer[YAFFS_BYTES_PER_CHUNK];\r
- // Under WinCE can't do direct transfer. Need to use a local buffer.\r
- // This is because we otherwise screw up WinCE's memory mapper\r
- memcpy(localBuffer,buffer,YAFFS_BYTES_PER_CHUNK);\r
- chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,localBuffer,YAFFS_BYTES_PER_CHUNK,0);\r
-#else\r
- // A full chunk. Write directly from the supplied buffer.\r
- chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,buffer,YAFFS_BYTES_PER_CHUNK,0);\r
-#endif\r
- // Since we've overwritten the cached data, we better invalidate it.\r
- yaffs_InvalidateChunkCache(in,chunk);\r
- //T(("Write to chunk %d %d\n",chunk,chunkWritten));\r
- }\r
- \r
- if(chunkWritten >= 0)\r
- {\r
- n -= nToCopy;\r
- offset += nToCopy;\r
- buffer += nToCopy;\r
- nDone += nToCopy;\r
- }\r
- \r
- }\r
- \r
- // Update file object\r
- \r
- if((startOfWrite + nDone) > in->variant.fileVariant.fileSize)\r
- {\r
- in->variant.fileVariant.fileSize = (startOfWrite + nDone);\r
- }\r
- \r
- in->dirty = 1;\r
- \r
- return nDone;\r
-}\r
-\r
-\r
-int yaffs_ResizeFile(yaffs_Object *in, int newSize)\r
-{\r
- int i;\r
- int chunkId;\r
- int oldFileSize = in->variant.fileVariant.fileSize;\r
- int sizeOfPartialChunk = newSize % YAFFS_BYTES_PER_CHUNK;\r
- \r
- yaffs_Device *dev = in->myDev;\r
- \r
- __u8 localBuffer[YAFFS_BYTES_PER_CHUNK];\r
-\r
- yaffs_FlushFilesChunkCache(in); \r
- yaffs_InvalidateWholeChunkCache(in);\r
- \r
- if(in->variantType != YAFFS_OBJECT_TYPE_FILE)\r
- {\r
- return yaffs_GetFileSize(in);\r
- }\r
- \r
- if(newSize < oldFileSize)\r
- {\r
- \r
- int lastDel = 1 + (oldFileSize-1)/YAFFS_BYTES_PER_CHUNK;\r
- \r
- int startDel = 1 + (newSize + YAFFS_BYTES_PER_CHUNK - 1)/\r
- YAFFS_BYTES_PER_CHUNK;\r
-\r
- // Delete backwards so that we don't end up with holes if\r
- // power is lost part-way through the operation.\r
- for(i = lastDel; i >= startDel; i--)\r
- {\r
- // NB this could be optimised somewhat,\r
- // eg. could retrieve the tags and write them without\r
- // using yaffs_DeleteChunk\r
-\r
- chunkId = yaffs_FindAndDeleteChunkInFile(in,i,NULL);\r
- if(chunkId <= 0 || chunkId >= (dev->endBlock * 32))\r
- {\r
- //T(("Found daft chunkId %d for %d\n",chunkId,i));\r
- }\r
- else\r
- {\r
- in->nDataChunks--;\r
- yaffs_DeleteChunk(dev,chunkId);\r
- }\r
- }\r
- \r
- \r
- if(sizeOfPartialChunk != 0)\r
- {\r
- int lastChunk = 1+ newSize/YAFFS_BYTES_PER_CHUNK;\r
- \r
- // Got to read and rewrite the last chunk with its new size.\r
- yaffs_ReadChunkDataFromObject(in,lastChunk,localBuffer);\r
- \r
- yaffs_WriteChunkDataToObject(in,lastChunk,localBuffer,sizeOfPartialChunk,1);\r
- \r
- }\r
- \r
- in->variant.fileVariant.fileSize = newSize;\r
- \r
- yaffs_PruneFileStructure(dev,&in->variant.fileVariant);\r
- \r
- return newSize;\r
- \r
- }\r
- else\r
- {\r
- return oldFileSize;\r
- }\r
-}\r
-\r
-\r
-loff_t yaffs_GetFileSize(yaffs_Object *obj)\r
-{\r
- obj = yaffs_GetEquivalentObject(obj);\r
- \r
- switch(obj->variantType)\r
- {\r
- case YAFFS_OBJECT_TYPE_FILE: \r
- return obj->variant.fileVariant.fileSize;\r
- case YAFFS_OBJECT_TYPE_SYMLINK:\r
- return strlen(obj->variant.symLinkVariant.alias);\r
- default:\r
- return 0;\r
- }\r
-}\r
-\r
-\r
-\r
-// yaffs_FlushFile() updates the file's\r
-// objectId in NAND\r
-\r
-int yaffs_FlushFile(yaffs_Object *in)\r
-{\r
- int retVal;\r
- if(in->dirty)\r
- {\r
- //T(("flushing object header\n"));\r
- \r
- yaffs_FlushFilesChunkCache(in);\r
- \r
-#ifdef CONFIG_YAFFS_WINCE\r
- yfsd_WinFileTimeNow(in->win_mtime);\r
-#else\r
- in->st_mtime = CURRENT_TIME;\r
-#endif\r
-\r
- retVal = yaffs_UpdateObjectHeader(in,NULL,0);\r
- }\r
- else\r
- {\r
- retVal = YAFFS_OK;\r
- }\r
- \r
- return retVal;\r
- \r
-}\r
-\r
-\r
-static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)\r
-{\r
-\r
- // First off, invalidate the file's data in the cache, without flushing.\r
- yaffs_InvalidateWholeChunkCache(in);\r
- \r
- yaffs_RemoveObjectFromDirectory(in);\r
- yaffs_DeleteChunk(in->myDev,in->chunkId);\r
-#ifdef __KERNEL__\r
- if(in->myInode)\r
- {\r
- in->myInode->u.generic_ip = NULL;\r
- in->myInode = 0;\r
- }\r
-#endif\r
- yaffs_FreeObject(in);\r
- return YAFFS_OK;\r
-\r
-}\r
-\r
-// yaffs_DeleteFile deletes the whole file data\r
-// and the inode associated with the file.\r
-// It does not delete the links associated with the file.\r
-static int yaffs_UnlinkFile(yaffs_Object *in)\r
-{\r
-\r
-#ifdef CONFIG_YAFFS_DISABLE_BACKGROUND_DELETION\r
- // Delete the file data & tnodes\r
-\r
- yaffs_DeleteWorker(in, in->variant.fileVariant.top, in->variant.fileVariant.topLevel, 0,NULL);\r
- \r
-\r
- yaffs_FreeTnode(in->myDev,in->variant.fileVariant.top);\r
- \r
- return yaffs_DoGenericObjectDeletion(in);\r
-#else\r
- int retVal;\r
- int immediateDeletion=0;\r
- retVal = yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,NULL,0);\r
- if(retVal == YAFFS_OK)\r
- {\r
- //in->unlinked = 1;\r
- //in->myDev->nUnlinkedFiles++;\r
- //in->renameAllowed = 0;\r
-#ifdef __KERNEL__\r
- if(in->myInode)\r
- {\r
- immediateDeletion = 1;\r
-\r
- }\r
-#endif\r
-#ifdef CONFIG_YAFFS_WINCE\r
- if(in->inUse <= 0)\r
- {\r
- immediateDeletion = 1;\r
-\r
- }\r
-#endif\r
- \r
- if(immediateDeletion)\r
- {\r
- T(YAFFS_TRACE_TRACING,(TSTR("yaffs: immediate deletion of file %d" TENDSTR),in->objectId));\r
- in->deleted=1;\r
- in->myDev->nDeletedFiles++;\r
- }\r
- \r
- }\r
- return retVal;\r
-\r
- \r
-#endif\r
-}\r
-\r
-int yaffs_DeleteFile(yaffs_Object *in)\r
-{\r
- int retVal = YAFFS_OK;\r
- if(!in->unlinked)\r
- {\r
- retVal = yaffs_UnlinkFile(in);\r
- }\r
- if(retVal == YAFFS_OK && \r
- in->unlinked &&\r
- !in->deleted)\r
- {\r
- in->deleted = 1;\r
- in->myDev->nDeletedFiles++;\r
- }\r
- return in->deleted ? YAFFS_OK : YAFFS_FAIL; \r
-}\r
-\r
-static int yaffs_DeleteDirectory(yaffs_Object *in)\r
-{\r
- //First check that the directory is empty.\r
- if(list_empty(&in->variant.directoryVariant.children))\r
- {\r
- return yaffs_DoGenericObjectDeletion(in);\r
- }\r
- \r
- return YAFFS_FAIL;\r
- \r
-}\r
-\r
-static int yaffs_DeleteSymLink(yaffs_Object *in)\r
-{\r
- YFREE(in->variant.symLinkVariant.alias);\r
-\r
- return yaffs_DoGenericObjectDeletion(in);\r
-}\r
-\r
-static int yaffs_DeleteHardLink(yaffs_Object *in)\r
-{\r
- // remove this hardlink from the list assocaited with the equivalent\r
- // object\r
- list_del(&in->hardLinks);\r
- return yaffs_DoGenericObjectDeletion(in); \r
-}\r
-\r
-\r
-static int yaffs_UnlinkWorker(yaffs_Object *obj)\r
-{\r
-\r
- \r
- if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)\r
- {\r
- return yaffs_DeleteHardLink(obj);\r
- }\r
- else if(!list_empty(&obj->hardLinks))\r
- { \r
- // Curve ball: We're unlinking an object that has a hardlink.\r
- //\r
- // This problem arises because we are not strictly following\r
- // The Linux link/inode model.\r
- //\r
- // We can't really delete the object.\r
- // Instead, we do the following:\r
- // - Select a hardlink.\r
- // - Unhook it from the hard links\r
- // - Unhook it from its parent directory (so that the rename can work)\r
- // - Rename the object to the hardlink's name.\r
- // - Delete the hardlink\r
- \r
- \r
- yaffs_Object *hl;\r
- int retVal;\r
- char name[YAFFS_MAX_NAME_LENGTH+1];\r
- \r
- hl = list_entry(obj->hardLinks.next,yaffs_Object,hardLinks);\r
- \r
- list_del_init(&hl->hardLinks);\r
- list_del_init(&hl->siblings);\r
- \r
- yaffs_GetObjectName(hl,name,YAFFS_MAX_NAME_LENGTH+1);\r
- \r
- retVal = yaffs_ChangeObjectName(obj, hl->parent, name,0);\r
- \r
- if(retVal == YAFFS_OK)\r
- {\r
- retVal = yaffs_DoGenericObjectDeletion(hl);\r
- }\r
- return retVal;\r
- \r
- }\r
- else\r
- {\r
- switch(obj->variantType)\r
- {\r
- case YAFFS_OBJECT_TYPE_FILE:\r
- return yaffs_UnlinkFile(obj);\r
- break;\r
- case YAFFS_OBJECT_TYPE_DIRECTORY:\r
- return yaffs_DeleteDirectory(obj);\r
- break;\r
- case YAFFS_OBJECT_TYPE_SYMLINK:\r
- return yaffs_DeleteSymLink(obj);\r
- break;\r
- case YAFFS_OBJECT_TYPE_HARDLINK:\r
- case YAFFS_OBJECT_TYPE_UNKNOWN:\r
- default:\r
- return YAFFS_FAIL;\r
- }\r
- }\r
-}\r
-\r
-int yaffs_Unlink(yaffs_Object *dir, const char *name)\r
-{\r
- yaffs_Object *obj;\r
- \r
- obj = yaffs_FindObjectByName(dir,name);\r
- \r
- if(obj && obj->unlinkAllowed)\r
- {\r
- return yaffs_UnlinkWorker(obj);\r
- }\r
- \r
- return YAFFS_FAIL;\r
- \r
-}\r
-\r
-//////////////// Initialisation Scanning /////////////////\r
-\r
-\r
-\r
-// For now we use the SmartMedia check.\r
-// We look at the blockStatus byte in the first two chunks\r
-// These must be 0xFF to pass as OK.\r
-// todo: this function needs to be modifyable foir different NAND types\r
-// and different chunk sizes. Suggest make this into a per-device configurable\r
-// function.\r
-static int yaffs_IsBlockBad(yaffs_Device *dev, int blk)\r
-{\r
- yaffs_Spare spare;\r
- \r
- yaffs_ReadChunkFromNAND(dev,blk * YAFFS_CHUNKS_PER_BLOCK,NULL,&spare,1);\r
-#if 1\r
- if(yaffs_CountBits(spare.blockStatus) < 7)\r
- {\r
- return 1;\r
- }\r
-#else\r
- if(spare.blockStatus != 0xFF)\r
- {\r
- return 1;\r
- }\r
-#endif\r
- yaffs_ReadChunkFromNAND(dev,blk * YAFFS_CHUNKS_PER_BLOCK + 1,NULL,&spare,1);\r
-\r
-#if 1\r
- if(yaffs_CountBits(spare.blockStatus) < 7)\r
- {\r
- return 1;\r
- }\r
-#else\r
- if(spare.blockStatus != 0xFF)\r
- {\r
- return 1;\r
- }\r
-#endif\r
- \r
- return 0;\r
- \r
-}\r
-\r
-static int yaffs_Scan(yaffs_Device *dev)\r
-{\r
- yaffs_Spare spare;\r
- yaffs_Tags tags;\r
- int blk;\r
- int chunk;\r
- int c;\r
- int deleted;\r
- yaffs_BlockState state;\r
- yaffs_Object *hardList = NULL;\r
- yaffs_Object *hl;\r
- yaffs_BlockInfo *bi;\r
-\r
- \r
- yaffs_ObjectHeader *oh;\r
- yaffs_Object *in;\r
- yaffs_Object *parent;\r
- \r
- __u8 chunkData[YAFFS_BYTES_PER_CHUNK];\r
- \r
- \r
- // Scan all the blocks...\r
- \r
- for(blk = dev->startBlock; blk <= dev->endBlock; blk++)\r
- {\r
- deleted = 0;\r
- bi = yaffs_GetBlockInfo(dev,blk);\r
- bi->pageBits = 0;\r
- bi->pagesInUse = 0;\r
- state = YAFFS_BLOCK_STATE_SCANNING;\r
- \r
- \r
- if(yaffs_IsBlockBad(dev,blk))\r
- {\r
- state = YAFFS_BLOCK_STATE_DEAD;\r
- T(YAFFS_TRACE_BAD_BLOCKS,(TSTR("block %d is bad" TENDSTR),blk));\r
- }\r
- \r
- // Read each chunk in the block.\r
- \r
- for(c = 0; c < YAFFS_CHUNKS_PER_BLOCK && \r
- state == YAFFS_BLOCK_STATE_SCANNING; c++)\r
- {\r
- // Read the spare area and decide what to do\r
- chunk = blk * YAFFS_CHUNKS_PER_BLOCK + c;\r
- \r
- yaffs_ReadChunkFromNAND(dev,chunk,NULL,&spare,1);\r
-\r
- \r
- // This block looks ok, now what's in this chunk?\r
- yaffs_GetTagsFromSpare(dev,&spare,&tags);\r
- \r
- if(yaffs_CountBits(spare.pageStatus) < 6)\r
- {\r
- // A deleted chunk\r
- deleted++;\r
- dev->nFreeChunks ++;\r
- //T((" %d %d deleted\n",blk,c));\r
- }\r
- else if(tags.objectId == YAFFS_UNUSED_OBJECT_ID)\r
- {\r
- // An unassigned chunk in the block\r
- // This means that either the block is empty or \r
- // this is the one being allocated from\r
- \r
- if(c == 0)\r
- {\r
- // the block is unused\r
- state = YAFFS_BLOCK_STATE_EMPTY;\r
- dev->nErasedBlocks++;\r
- }\r
- else\r
- {\r
- // this is the block being allocated from\r
- T(YAFFS_TRACE_SCAN,(TSTR(" Allocating from %d %d" TENDSTR),blk,c));\r
- state = YAFFS_BLOCK_STATE_ALLOCATING;\r
- dev->allocationBlock = blk;\r
- dev->allocationPage = c;\r
- }\r
-\r
- dev->nFreeChunks += (YAFFS_CHUNKS_PER_BLOCK - c);\r
- }\r
- else if(tags.chunkId > 0)\r
- {\r
- int endpos;\r
- // A data chunk.\r
- bi->pageBits |= (1 << c);\r
- bi->pagesInUse++;\r
- \r
- in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,YAFFS_OBJECT_TYPE_FILE);\r
- // PutChunkIntoFIle checks for a clash (two data chunks with\r
- // the same chunkId).\r
- yaffs_PutChunkIntoFile(in,tags.chunkId,chunk,1);\r
- endpos = (tags.chunkId - 1)* YAFFS_BYTES_PER_CHUNK + tags.byteCount;\r
- if(in->variant.fileVariant.scannedFileSize <endpos)\r
- {\r
- in->variant.fileVariant.scannedFileSize = endpos;\r
-#ifndef CONFIG_YAFFS_USE_HEADER_FILE_SIZE\r
- in->variant.fileVariant.fileSize = \r
- in->variant.fileVariant.scannedFileSize;\r
-#endif\r
-\r
- }\r
- //T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId)); \r
- }\r
- else\r
- {\r
- // chunkId == 0, so it is an ObjectHeader.\r
- // Thus, we read in the object header and make the object\r
- bi->pageBits |= (1 << c);\r
- bi->pagesInUse++;\r
- \r
- yaffs_ReadChunkFromNAND(dev,chunk,chunkData,NULL,1);\r
- \r
- oh = (yaffs_ObjectHeader *)chunkData;\r
- \r
- in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,oh->type);\r
- \r
- if(in->valid)\r
- {\r
- // We have already filled this one. We have a duplicate and need to resolve it.\r
- \r
- unsigned existingSerial = in->serial;\r
- unsigned newSerial = tags.serialNumber;\r
- \r
- if(((existingSerial+1) & 3) == newSerial)\r
- {\r
- // Use new one - destroy the exisiting one\r
- yaffs_DeleteChunk(dev,in->chunkId);\r
- in->valid = 0;\r
- }\r
- else\r
- {\r
- // Use existing - destroy this one.\r
- yaffs_DeleteChunk(dev,chunk);\r
- }\r
- }\r
- \r
- if(!in->valid &&\r
- (tags.objectId == YAFFS_OBJECTID_ROOT ||\r
- tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))\r
- {\r
- // We only load some info, don't fiddle with directory structure\r
- in->valid = 1;\r
- in->variantType = oh->type;\r
- \r
- in->st_mode = oh->st_mode;\r
-#ifdef CONFIG_YAFFS_WINCE\r
- in->win_atime[0] = oh->win_atime[0];\r
- in->win_ctime[0] = oh->win_ctime[0];\r
- in->win_mtime[0] = oh->win_mtime[0];\r
- in->win_atime[1] = oh->win_atime[1];\r
- in->win_ctime[1] = oh->win_ctime[1];\r
- in->win_mtime[1] = oh->win_mtime[1];\r
-#else\r
- in->st_uid = oh->st_uid;\r
- in->st_gid = oh->st_gid;\r
- in->st_atime = oh->st_atime;\r
- in->st_mtime = oh->st_mtime;\r
- in->st_ctime = oh->st_ctime;\r
- in->st_rdev = oh->st_rdev;\r
-#endif\r
- in->chunkId = chunk;\r
-\r
- }\r
- else if(!in->valid)\r
- {\r
- // we need to load this info\r
- \r
- in->valid = 1;\r
- in->variantType = oh->type;\r
- \r
- in->st_mode = oh->st_mode;\r
-#ifdef CONFIG_YAFFS_WINCE\r
- in->win_atime[0] = oh->win_atime[0];\r
- in->win_ctime[0] = oh->win_ctime[0];\r
- in->win_mtime[0] = oh->win_mtime[0];\r
- in->win_atime[1] = oh->win_atime[1];\r
- in->win_ctime[1] = oh->win_ctime[1];\r
- in->win_mtime[1] = oh->win_mtime[1];\r
-#else\r
- in->st_uid = oh->st_uid;\r
- in->st_gid = oh->st_gid;\r
- in->st_atime = oh->st_atime;\r
- in->st_mtime = oh->st_mtime;\r
- in->st_ctime = oh->st_ctime;\r
- in->st_rdev = oh->st_rdev;\r
-#endif\r
- in->chunkId = chunk;\r
-\r
- yaffs_SetObjectName(in,oh->name);\r
- in->dirty = 0;\r
- \r
- // directory stuff...\r
- // hook up to parent\r
- \r
- parent = yaffs_FindOrCreateObjectByNumber(dev,oh->parentObjectId,YAFFS_OBJECT_TYPE_DIRECTORY);\r
- if(parent->variantType == YAFFS_OBJECT_TYPE_UNKNOWN)\r
- {\r
- // Set up as a directory\r
- parent->variantType = YAFFS_OBJECT_TYPE_DIRECTORY;\r
- INIT_LIST_HEAD(&parent->variant.directoryVariant.children);\r
- }\r
- else if(parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)\r
- {\r
- // Hoosterman, another problem....\r
- // We're trying to use a non-directory as a directory\r
- // Todo ... handle\r
- T(YAFFS_TRACE_ERROR, (TSTR("yaffs tradgedy: attempting to use non-directory as a directory in scan" TENDSTR)));\r
-\r
- }\r
- \r
- yaffs_AddObjectToDirectory(parent,in);\r
- if(parent == dev->unlinkedDir)\r
- {\r
- in->deleted = 1; // If it is unlinked at start up then it wants deleting\r
- dev->nDeletedFiles++;\r
- }\r
- \r
- // Note re hardlinks.\r
- // Since we might scan a hardlink before its equivalent object is scanned\r
- // we put them all in a list.\r
- // After scanning is complete, we should have all the objects, so we run through this\r
- // list and fix up all the chains. \r
- \r
- switch(in->variantType)\r
- {\r
- case YAFFS_OBJECT_TYPE_UNKNOWN: // Todo got a problem\r
- break;\r
- case YAFFS_OBJECT_TYPE_FILE:\r
-#ifdef CONFIG_YAFFS_USE_HEADER_FILE_SIZE\r
- in->variant.fileVariant.fileSize = oh->fileSize;\r
-#endif\r
- break;\r
- case YAFFS_OBJECT_TYPE_HARDLINK:\r
- in->variant.hardLinkVariant.equivalentObjectId = oh->equivalentObjectId;\r
- (yaffs_Object *)(in->hardLinks.next) = hardList;\r
- hardList = in;\r
- break;\r
- case YAFFS_OBJECT_TYPE_DIRECTORY: // Do nothing\r
- break;\r
- case YAFFS_OBJECT_TYPE_SPECIAL: // Do nothing\r
- break;\r
- case YAFFS_OBJECT_TYPE_SYMLINK: // Do nothing\r
- in->variant.symLinkVariant.alias = yaffs_CloneString(oh->alias);\r
- break;\r
- }\r
- //T((" %d %d header %d \"%s\" type %d\n",blk,c,tags.objectId,oh->name,in->variantType)); \r
- }\r
- }\r
- }\r
- \r
- if(state == YAFFS_BLOCK_STATE_SCANNING)\r
- {\r
- // If we got this far while scanning, then the block is fully allocated.\r
- state = YAFFS_BLOCK_STATE_FULL; \r
- }\r
- \r
- bi->blockState = state;\r
- \r
- // Now let's see if it was dirty\r
- if( bi->pagesInUse == 0 &&\r
- bi->blockState == YAFFS_BLOCK_STATE_FULL)\r
- {\r
- yaffs_BlockBecameDirty(dev,blk);\r
- }\r
-\r
- }\r
- \r
- // Fix up the hard link chains.\r
- // We should now have scanned all the objects, now it's time to add these \r
- // hardlinks.\r
- while(hardList)\r
- {\r
- hl = hardList;\r
- hardList = (yaffs_Object *)(hardList->hardLinks.next);\r
- \r
- in = yaffs_FindObjectByNumber(dev,hl->variant.hardLinkVariant.equivalentObjectId);\r
- \r
- if(in)\r
- {\r
- // Add the hardlink pointers\r
- hl->variant.hardLinkVariant.equivalentObject=in;\r
- list_add(&hl->hardLinks,&in->hardLinks);\r
- }\r
- else\r
- {\r
- //Todo Need to report/handle this better.\r
- // Got a problem... hardlink to a non-existant object\r
- hl->variant.hardLinkVariant.equivalentObject=NULL;\r
- INIT_LIST_HEAD(&hl->hardLinks);\r
- \r
- }\r
- \r
- }\r
- \r
- \r
- \r
- return YAFFS_OK;\r
-}\r
-\r
-\r
-////////////////////////// Directory Functions /////////////////////////\r
-\r
-\r
-static void yaffs_AddObjectToDirectory(yaffs_Object *directory, yaffs_Object *obj)\r
-{\r
-\r
- if(obj->siblings.prev == NULL)\r
- {\r
- // Not initialised\r
- INIT_LIST_HEAD(&obj->siblings);\r
- \r
- }\r
- else if(!list_empty(&obj->siblings))\r
- {\r
- // If it is holed up somewhere else, un hook it\r
- list_del_init(&obj->siblings);\r
- }\r
- // Now add it\r
- list_add(&obj->siblings,&directory->variant.directoryVariant.children);\r
- obj->parent = directory;\r
- \r
- if(directory == obj->myDev->unlinkedDir)\r
- {\r
- obj->unlinked = 1;\r
- obj->myDev->nUnlinkedFiles++;\r
- obj->renameAllowed = 0;\r
- }\r
-}\r
-\r
-static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)\r
-{\r
- list_del_init(&obj->siblings);\r
- obj->parent = NULL;\r
-}\r
-\r
-yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,const char *name)\r
-{\r
- int sum;\r
- \r
- struct list_head *i;\r
- char buffer[YAFFS_MAX_NAME_LENGTH+1];\r
- \r
- yaffs_Object *l;\r
- \r
- sum = yaffs_CalcNameSum(name);\r
- \r
- list_for_each(i,&directory->variant.directoryVariant.children)\r
- {\r
- l = list_entry(i, yaffs_Object,siblings);\r
- \r
- // Special case for lost-n-found\r
- if(l->objectId == YAFFS_OBJECTID_LOSTNFOUND)\r
- {\r
- if(yaffs_strcmp(name,YAFFS_LOSTNFOUND_NAME) == 0)\r
- {\r
- return l;\r
- }\r
- }\r
- else if(yaffs_SumCompare(l->sum, sum))\r
- {\r
- // Do a real check\r
- yaffs_GetObjectName(l,buffer,YAFFS_MAX_NAME_LENGTH);\r
- if(yaffs_strcmp(name,buffer) == 0)\r
- {\r
- return l;\r
- }\r
- \r
- \r
- }\r
- }\r
- \r
- return NULL;\r
-}\r
-\r
-\r
-int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,int (*fn)(yaffs_Object *))\r
-{\r
- struct list_head *i; \r
- yaffs_Object *l;\r
- \r
- \r
- list_for_each(i,&theDir->variant.directoryVariant.children)\r
- {\r
- l = list_entry(i, yaffs_Object,siblings);\r
- if(!fn(l))\r
- {\r
- return YAFFS_FAIL;\r
- }\r
- }\r
- \r
- return YAFFS_OK;\r
-\r
-}\r
-\r
-\r
-// GetEquivalentObject dereferences any hard links to get to the\r
-// actual object.\r
-\r
-yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj)\r
-{\r
- if(obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)\r
- {\r
- // We want the object id of the equivalent object, not this one\r
- obj = obj->variant.hardLinkVariant.equivalentObject;\r
- }\r
- return obj;\r
-\r
-}\r
-\r
-int yaffs_GetObjectName(yaffs_Object *obj,char *name,int buffSize)\r
-{\r
- memset(name,0,buffSize);\r
- \r
- if(obj->objectId == YAFFS_OBJECTID_LOSTNFOUND)\r
- {\r
- strncpy(name,YAFFS_LOSTNFOUND_NAME,buffSize - 1);\r
- }\r
- else if(obj->chunkId <= 0)\r
- {\r
- char locName[20];\r
- // make up a name\r
- sprintf(locName,"%s%d",YAFFS_LOSTNFOUND_PREFIX,obj->objectId);\r
- strncpy(name,locName,buffSize - 1);\r
-\r
- }\r
-#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM\r
- else if(obj->shortName[0])\r
- {\r
- strcpy(name,obj->shortName);\r
- }\r
-#endif\r
- else\r
- {\r
- __u8 buffer[YAFFS_BYTES_PER_CHUNK];\r
- yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer;\r
-\r
- memset(buffer,0,YAFFS_BYTES_PER_CHUNK);\r
- \r
- if(obj->chunkId >= 0)\r
- {\r
- yaffs_ReadChunkFromNAND(obj->myDev,obj->chunkId,buffer,NULL,1);\r
- }\r
- strncpy(name,oh->name,buffSize - 1);\r
- }\r
- \r
- return strlen(name);\r
-}\r
-\r
-int yaffs_GetObjectFileLength(yaffs_Object *obj)\r
-{\r
- \r
- // Dereference any hard linking\r
- obj = yaffs_GetEquivalentObject(obj);\r
- \r
- if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)\r
- {\r
- return obj->variant.fileVariant.fileSize;\r
- }\r
- if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)\r
- {\r
- return strlen(obj->variant.symLinkVariant.alias);\r
- }\r
- else\r
- {\r
- // Only a directory should drop through to here\r
- return YAFFS_BYTES_PER_CHUNK;\r
- } \r
-}\r
-\r
-int yaffs_GetObjectLinkCount(yaffs_Object *obj)\r
-{\r
- int count = 0; \r
- struct list_head *i;\r
- \r
- if(!obj->unlinked)\r
- {\r
- count++; // the object itself\r
- }\r
- list_for_each(i,&obj->hardLinks)\r
- {\r
- count++; // add the hard links;\r
- }\r
- return count;\r
- \r
-}\r
-\r
-\r
-int yaffs_GetObjectInode(yaffs_Object *obj)\r
-{\r
- obj = yaffs_GetEquivalentObject(obj);\r
- \r
- return obj->objectId;\r
-}\r
-\r
-unsigned yaffs_GetObjectType(yaffs_Object *obj)\r
-{\r
- obj = yaffs_GetEquivalentObject(obj);\r
- \r
- switch(obj->variantType)\r
- {\r
- case YAFFS_OBJECT_TYPE_FILE: return DT_REG; break;\r
- case YAFFS_OBJECT_TYPE_DIRECTORY: return DT_DIR; break;\r
- case YAFFS_OBJECT_TYPE_SYMLINK: return DT_LNK; break;\r
- case YAFFS_OBJECT_TYPE_HARDLINK: return DT_REG; break;\r
- case YAFFS_OBJECT_TYPE_SPECIAL: \r
- if(S_ISFIFO(obj->st_mode)) return DT_FIFO;\r
- if(S_ISCHR(obj->st_mode)) return DT_CHR;\r
- if(S_ISBLK(obj->st_mode)) return DT_BLK;\r
- if(S_ISSOCK(obj->st_mode)) return DT_SOCK;\r
- default: return DT_REG; break;\r
- }\r
-}\r
-\r
-char *yaffs_GetSymlinkAlias(yaffs_Object *obj)\r
-{\r
- obj = yaffs_GetEquivalentObject(obj);\r
- if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)\r
- {\r
- return yaffs_CloneString(obj->variant.symLinkVariant.alias);\r
- }\r
- else\r
- {\r
- return yaffs_CloneString("");\r
- }\r
-}\r
-\r
-#ifndef CONFIG_YAFFS_WINCE\r
-\r
-int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr)\r
-{\r
- unsigned int valid = attr->ia_valid;\r
- \r
- if(valid & ATTR_MODE) obj->st_mode = attr->ia_mode;\r
- if(valid & ATTR_UID) obj->st_uid = attr->ia_uid;\r
- if(valid & ATTR_GID) obj->st_gid = attr->ia_gid;\r
- \r
- if(valid & ATTR_ATIME) obj->st_atime = attr->ia_atime;\r
- if(valid & ATTR_CTIME) obj->st_ctime = attr->ia_ctime;\r
- if(valid & ATTR_MTIME) obj->st_mtime = attr->ia_mtime;\r
- \r
- if(valid & ATTR_SIZE) yaffs_ResizeFile(obj,attr->ia_size);\r
- \r
- yaffs_UpdateObjectHeader(obj,NULL,1);\r
- \r
- return YAFFS_OK;\r
- \r
-}\r
-int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr)\r
-{\r
- unsigned int valid = 0;\r
- \r
- attr->ia_mode = obj->st_mode; valid |= ATTR_MODE;\r
- attr->ia_uid = obj->st_uid; valid |= ATTR_UID;\r
- attr->ia_gid = obj->st_gid; valid |= ATTR_GID;\r
- \r
- attr->ia_atime = obj->st_atime; valid |= ATTR_ATIME;\r
- attr->ia_ctime = obj->st_ctime; valid |= ATTR_CTIME;\r
- attr->ia_mtime = obj->st_mtime; valid |= ATTR_MTIME;\r
- \r
- attr->ia_size = yaffs_GetFileSize(obj); valid |= ATTR_SIZE;\r
- \r
- attr->ia_valid = valid;\r
- \r
- return YAFFS_OK;\r
- \r
-}\r
-\r
-#endif\r
-\r
-int yaffs_DumpObject(yaffs_Object *obj)\r
-{\r
-// __u8 buffer[YAFFS_BYTES_PER_CHUNK];\r
- char name[257];\r
-// yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer;\r
-\r
-// memset(buffer,0,YAFFS_BYTES_PER_CHUNK);\r
- \r
-// if(obj->chunkId >= 0)\r
-// {\r
-// yaffs_ReadChunkFromNAND(obj->myDev,obj->chunkId,buffer,NULL);\r
-// }\r
- \r
- yaffs_GetObjectName(obj,name,256);\r
- \r
- T(YAFFS_TRACE_ALWAYS,(TSTR("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d chunk %d type %d size %d\n" TENDSTR),\r
- obj->objectId,yaffs_GetObjectInode(obj), name, obj->dirty, obj->valid, obj->serial, \r
- obj->sum, obj->chunkId, yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));\r
-\r
-#if 0\r
- YPRINTF(("Object %d \"%s\"\n dirty %d valid %d serial %d sum %d chunk %d\n",\r
- obj->objectId, oh->name, obj->dirty, obj->valid, obj->serial, \r
- obj->sum, obj->chunkId));\r
- switch(obj->variantType)\r
- {\r
- case YAFFS_OBJECT_TYPE_FILE: \r
- YPRINTF((" FILE length %d\n",obj->variant.fileVariant.fileSize));\r
- break;\r
- case YAFFS_OBJECT_TYPE_DIRECTORY:\r
- YPRINTF((" DIRECTORY\n"));\r
- break;\r
- case YAFFS_OBJECT_TYPE_HARDLINK: //todo\r
- case YAFFS_OBJECT_TYPE_SYMLINK:\r
- case YAFFS_OBJECT_TYPE_UNKNOWN:\r
- default:\r
- }\r
-#endif\r
- \r
- return YAFFS_OK;\r
-}\r
-\r
-\r
-///////////////////////// Initialisation code ///////////////////////////\r
-\r
-\r
-\r
-int yaffs_GutsInitialise(yaffs_Device *dev)\r
-{\r
- unsigned x;\r
- int bits;\r
- int extraBits;\r
- int nBlocks;\r
-\r
-\r
- \r
- if(!yaffs_CheckStructures())\r
- {\r
- T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs_CheckStructures failed\n" TENDSTR)));\r
- return YAFFS_FAIL;\r
- }\r
- \r
- if(dev->startBlock <= 0 ||\r
- (dev->endBlock - dev->startBlock) < 10)\r
- {\r
- T(YAFFS_TRACE_ALWAYS,(TSTR("startBlock %d or endBlock %d invalid\n" TENDSTR),\r
- dev->startBlock, dev->endBlock));\r
- return YAFFS_FAIL;\r
- }\r
- \r
- nBlocks = dev->endBlock - dev->startBlock + 1;\r
- \r
-\r
- \r
- // OK now calculate a few things for the device\r
- // Calculate chunkGroupBits. \r
- // We need to find the next power of 2 > than endBlock\r
- \r
- x = YAFFS_CHUNKS_PER_BLOCK * (dev->endBlock+1);\r
- \r
- for(bits = extraBits = 0; x > 1; bits++)\r
- {\r
- if(x & 1) extraBits++;\r
- x >>= 1;\r
- }\r
-\r
- if(extraBits > 0) bits++;\r
- \r
- \r
- // Level0 Tnodes are 16 bits, so if the bitwidth of the\r
- // chunk range we're using is greater than 16 we need \r
- // to figure out chunk shift and chunkGroupSize\r
- if(bits <= 16) \r
- {\r
- dev->chunkGroupBits = 0;\r
- }\r
- else\r
- {\r
- dev->chunkGroupBits = bits - 16;\r
- }\r
- dev->chunkGroupSize = 1 << dev->chunkGroupBits;\r
- \r
- \r
- // More device initialisation\r
- dev->garbageCollectionRequired = 0;\r
- dev->garbageCollections = 0;\r
- dev->currentDirtyChecker = 0;\r
- dev->bufferedBlock = -1;\r
- dev->doingBufferedBlockRewrite = 0;\r
- dev->blockSelectedForGC = -1;\r
- dev->nDeletedFiles = 0;\r
- dev->nBackgroundDeletions=0;\r
- dev->nUnlinkedFiles = 0;\r
- dev->eccFixed=0;\r
- dev->eccUnfixed=0;\r
- dev->tagsEccFixed=0;\r
- dev->tagsEccUnfixed=0;\r
- \r
- yaffs_InitialiseBlocks(dev,nBlocks);\r
- \r
- yaffs_InitialiseTnodes(dev);\r
-\r
- yaffs_InitialiseObjects(dev);\r
- \r
-#ifdef CONFIG_YAFFS_SHORT_OP_CACHE\r
- { \r
- int i;\r
- for(i=0; i < YAFFS_N_CACHE_CHUNKS; i++)\r
- {\r
- dev->srCache[i].object = NULL;\r
- dev->srCache[i].lastUse = 0;\r
- dev->srCache[i].dirty = 0;\r
- }\r
- dev->srLastUse = 0;\r
- }\r
-#endif\r
-\r
- dev->cacheHits = 0;\r
- \r
- \r
- // Initialise the unlinked, root and lost and found directories\r
- dev->lostNFoundDir = dev->rootDir = dev->unlinkedDir = NULL;\r
- \r
- dev->unlinkedDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_UNLINKED, S_IFDIR);\r
-\r
- dev->rootDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_ROOT,YAFFS_ROOT_MODE | S_IFDIR);\r
- dev->lostNFoundDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_LOSTNFOUND,YAFFS_LOSTNFOUND_MODE | S_IFDIR);\r
- yaffs_AddObjectToDirectory(dev->rootDir,dev->lostNFoundDir);\r
- \r
- \r
- // Now scan the flash. \r
- yaffs_Scan(dev);\r
- \r
- // Zero out stats\r
- dev->nPageReads = 0;\r
- dev->nPageWrites = 0;\r
- dev->nBlockErasures = 0;\r
- dev->nGCCopies = 0;\r
- dev->nRetriedWrites = 0;\r
- dev->nRetiredBlocks = 0;\r
-\r
- \r
- return YAFFS_OK;\r
- \r
-}\r
-\r
-void yaffs_Deinitialise(yaffs_Device *dev)\r
-{\r
- yaffs_DeinitialiseBlocks(dev);\r
- yaffs_DeinitialiseTnodes(dev);\r
- yaffs_DeinitialiseObjects(dev);\r
- \r
-}\r
-\r
-int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)\r
-{\r
- int nFree = dev->nFreeChunks - (YAFFS_CHUNKS_PER_BLOCK * YAFFS_RESERVED_BLOCKS);\r
- \r
- struct list_head *i; \r
- yaffs_Object *l;\r
- \r
- \r
- // To the free chunks add the chunks that are in the deleted unlinked files.\r
- list_for_each(i,&dev->unlinkedDir->variant.directoryVariant.children)\r
- {\r
- l = list_entry(i, yaffs_Object,siblings);\r
- if(l->deleted)\r
- {\r
- nFree++;\r
- nFree += l->nDataChunks;\r
- }\r
- }\r
-\r
-\r
- return (nFree < 0) ? 0 : nFree; \r
- \r
-}\r
-\r
-\r
-/////////////////// YAFFS test code //////////////////////////////////\r
-\r
-#define yaffs_CheckStruct(structure,syze, name) \\r
- if(sizeof(structure) != syze) \\r
- { \\r
- T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),name,syze,sizeof(structure))); \\r
- return YAFFS_FAIL; \\r
- }\r
- \r
- \r
-static int yaffs_CheckStructures(void)\r
-{\r
- yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags")\r
- yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion")\r
- yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare")\r
- yaffs_CheckStruct(yaffs_Tnode,2* YAFFS_NTNODES_LEVEL0,"yaffs_Tnode")\r
- yaffs_CheckStruct(yaffs_ObjectHeader,512,"yaffs_ObjectHeader")\r
- \r
- \r
- return YAFFS_OK;\r
-}\r
-\r
-#if 0\r
-void yaffs_GutsTest(yaffs_Device *dev)\r
-{\r
- \r
- if(yaffs_CheckStructures() != YAFFS_OK)\r
- {\r
- T(YAFFS_TRACE_ALWAYS,(TSTR("One or more structures malformed-- aborting\n" TENDSTR)));\r
- return;\r
- }\r
- \r
- yaffs_TnodeTest(dev);\r
- yaffs_ObjectTest(dev); \r
-}\r
-#endif\r
-\r
-\r
-\r
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system.
+ * yaffs_guts.c The main guts of YAFFS
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ * for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+ //yaffs_guts.c
+
+const char *yaffs_guts_c_version="$Id: yaffs_guts.c,v 1.13 2002-11-26 01:15:37 charles Exp $";
+
+#include "yportenv.h"
+
+#include "yaffsinterface.h"
+#include "yaffs_guts.h"
+
+
+#define YAFFS_GARBAGE_COLLECT_LOW_WATER 2
+
+
+
+// External functions for ECC on data
+void nand_calculate_ecc (const u_char *dat, u_char *ecc_code);
+int nand_correct_data (u_char *dat, u_char *read_ecc, u_char *calc_ecc);
+
+
+// countBits is a quick way of counting the number of bits in a byte.
+// ie. countBits[n] holds the number of 1 bits in a byte with the value n.
+
+static const char yaffs_countBitsTable[256] =
+{
+0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4,
+1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
+1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
+2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
+1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
+2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
+2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
+3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
+1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
+2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
+2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
+3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
+2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
+3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
+3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
+4,5,5,6,5,6,6,7,5,6,6,7,6,7,7,8
+};
+
+static int yaffs_CountBits(__u8 x)
+{
+ int retVal;
+ retVal = yaffs_countBitsTable[x];
+ return retVal;
+}
+
+
+
+// Local prototypes
+static int yaffs_CheckObjectHashSanity(yaffs_Device *dev);
+static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr);
+static void yaffs_GetTagsFromSpare(yaffs_Device *dev, yaffs_Spare *sparePtr,yaffs_Tags *tagsPtr);
+static int yaffs_PutChunkIntoFile(yaffs_Object *in,int chunkInInode, int chunkInNAND, int inScan);
+
+static yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev,int number,yaffs_ObjectType type);
+static void yaffs_AddObjectToDirectory(yaffs_Object *directory, yaffs_Object *obj);
+static int yaffs_UpdateObjectHeader(yaffs_Object *in,const char *name, int force);
+static void yaffs_DeleteChunk(yaffs_Device *dev,int chunkId);
+static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj);
+static int yaffs_CheckStructures(void);
+static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, int chunkOffset,int *limit);
+static int yaffs_DoGenericObjectDeletion(yaffs_Object *in);
+
+static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device *dev,int blockNo);
+
+// Robustification
+static void yaffs_RetireBlock(yaffs_Device *dev,int blockInNAND);
+static void yaffs_HandleReadDataError(yaffs_Device *dev,int chunkInNAND);
+static void yaffs_HandleWriteChunkError(yaffs_Device *dev,int chunkInNAND);
+static void yaffs_HandleWriteChunkOk(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_Spare *spare);
+static void yaffs_HandleUpdateChunk(yaffs_Device *dev,int chunkInNAND, const yaffs_Spare *spare);
+
+static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,int chunkInNAND);
+
+static int yaffs_UnlinkWorker(yaffs_Object *obj);
+
+
+static int yaffs_VerifyCompare(const __u8 *d0, const __u8 * d1, const yaffs_Spare *s0, const yaffs_Spare *s1);
+
+
+
+loff_t yaffs_GetFileSize(yaffs_Object *obj);
+
+static int yaffs_ReadChunkTagsFromNAND(yaffs_Device *dev,int chunkInNAND, yaffs_Tags *tags, int *chunkDeleted);
+static int yaffs_TagsMatch(const yaffs_Tags *tags, int objectId, int chunkInObject, int chunkDeleted);
+
+
+static int yaffs_AllocateChunk(yaffs_Device *dev,int useReserve);
+
+#ifdef YAFFS_PARANOID
+static int yaffs_CheckFileSanity(yaffs_Object *in);
+#else
+#define yaffs_CheckFileSanity(in)
+#endif
+
+static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in);
+static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId);
+
+
+static __inline__ yaffs_BlockInfo* yaffs_GetBlockInfo(yaffs_Device *dev, int blk)
+{
+ if(blk < dev->startBlock || blk > dev->endBlock)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs: block %d is not valid" TENDSTR),blk));
+ YBUG();
+ }
+ return &dev->blockInfo[blk - dev->startBlock];
+}
+
+
+static __inline__ int yaffs_HashFunction(int n)
+{
+ return (n % YAFFS_NOBJECT_BUCKETS);
+}
+
+
+yaffs_Object *yaffs_Root(yaffs_Device *dev)
+{
+ return dev->rootDir;
+}
+
+yaffs_Object *yaffs_LostNFound(yaffs_Device *dev)
+{
+ return dev->lostNFoundDir;
+}
+
+
+static int yaffs_WriteChunkToNAND(struct yaffs_DeviceStruct *dev,int chunkInNAND, const __u8 *data, yaffs_Spare *spare)
+{
+ if(chunkInNAND < dev->startBlock * YAFFS_CHUNKS_PER_BLOCK)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs chunk %d is not valid" TENDSTR),chunkInNAND));
+ return YAFFS_FAIL;
+ }
+
+ dev->nPageWrites++;
+ return dev->writeChunkToNAND(dev,chunkInNAND,data,spare);
+}
+
+struct nandspare {
+ yaffs_Spare spare;
+ int eccres1;
+ int eccres2;
+};
+
+int yaffs_ReadChunkFromNAND(struct yaffs_DeviceStruct *dev,
+ int chunkInNAND,
+ __u8 *data,
+ yaffs_Spare *spare,
+ int doErrorCorrection)
+{
+ int retVal;
+ yaffs_Spare localSpare;
+
+#ifndef CONFIG_YAFFS_USE_NANDECC
+ __u8 calcEcc[3];
+ int eccResult1,eccResult2;
+#else
+ struct nandspare nspare;
+#endif
+
+ dev->nPageReads++;
+
+
+
+
+ if(!spare && data)
+ {
+ // If we don't have a real spare, then we use a local one.
+ // Need this for the calculation of the ecc
+ spare = &localSpare;
+ }
+
+
+#ifndef CONFIG_YAFFS_USE_NANDECC
+ retVal = dev->readChunkFromNAND(dev,chunkInNAND,data,spare);
+ if(data && doErrorCorrection)
+ {
+ // Hoosterman, we had a data problem on this page
+ yaffs_HandleReadDataError(dev,chunkInNAND);
+ }
+#else
+ retVal = dev->readChunkFromNAND(dev,chunkInNAND,data,(yaffs_Spare*)&nspare);
+ memcpy (spare, &nspare, sizeof(yaffs_Spare));
+ if(data && doErrorCorrection)
+ {
+ if(nspare.eccres1>0)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error fix performed on chunk %d:0" TENDSTR),chunkInNAND));
+ }
+ else if(nspare.eccres1<0)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:0" TENDSTR),chunkInNAND));
+ }
+
+ if(nspare.eccres2>0)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error fix performed on chunk %d:1" TENDSTR),chunkInNAND));
+ }
+ else if(nspare.eccres2<0)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:1" TENDSTR),chunkInNAND));
+ }
+
+ if(nspare.eccres2 || nspare.eccres2)
+ {
+ // Hoosterman, we had a data problem on this page
+ yaffs_HandleReadDataError(dev,chunkInNAND);
+ }
+
+ }
+#endif
+ return retVal;
+}
+
+
+static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,int chunkInNAND)
+{
+
+ static int init = 0;
+ static __u8 cmpbuf[YAFFS_BYTES_PER_CHUNK];
+ static __u8 data[YAFFS_BYTES_PER_CHUNK];
+ static __u8 spare[16];
+
+
+ dev->readChunkFromNAND(dev,chunkInNAND,data,(yaffs_Spare *)spare);
+
+
+
+ if(!init)
+ {
+ memset(cmpbuf,0xff,YAFFS_BYTES_PER_CHUNK);
+ init = 1;
+ }
+
+ if(memcmp(cmpbuf,data,YAFFS_BYTES_PER_CHUNK)) return YAFFS_FAIL;
+ if(memcmp(cmpbuf,spare,16)) return YAFFS_FAIL;
+
+
+ return YAFFS_OK;
+
+}
+
+
+
+int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,int blockInNAND)
+{
+ dev->nBlockErasures++;
+ return dev->eraseBlockInNAND(dev,blockInNAND);
+}
+
+int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev)
+{
+ return dev->initialiseNAND(dev);
+}
+
+static int yaffs_WriteNewChunkToNAND(struct yaffs_DeviceStruct *dev, const __u8 *data, yaffs_Spare *spare,int useReserve)
+{
+ int chunk;
+
+ int writeOk = 1;
+ int attempts = 0;
+
+ unsigned char rbData[YAFFS_BYTES_PER_CHUNK];
+ yaffs_Spare rbSpare;
+
+ do{
+ chunk = yaffs_AllocateChunk(dev,useReserve);
+
+ if(chunk >= 0)
+ {
+
+ // First check this chunk is erased...
+#ifndef CONFIG_YAFFS_DISABLE_CHUNK_ERASED_CHECK
+ writeOk = yaffs_CheckChunkErased(dev,chunk);
+#endif
+ if(!writeOk)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs chunk %d was not erased" TENDSTR),chunk));
+ }
+ else
+ {
+ writeOk = yaffs_WriteChunkToNAND(dev,chunk,data,spare);
+ }
+ attempts++;
+ if(writeOk)
+ {
+ // Readback & verify
+ // If verify fails, then delete this chunk and try again
+ // To verify we compare everything except the block and
+ // page status bytes.
+ // NB We check a raw read without ECC correction applied
+ yaffs_ReadChunkFromNAND(dev,chunk,rbData,&rbSpare,0);
+
+#ifndef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
+ if(!yaffs_VerifyCompare(data,rbData,spare,&rbSpare))
+ {
+ // Didn't verify
+ T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs write verify failed on chunk %d" TENDSTR), chunk));
+
+ writeOk = 0;
+ }
+#endif
+
+ }
+ if(writeOk)
+ {
+ // Copy the data into the write buffer.
+ // NB We do this at the end to prevent duplicates in the case of a write error.
+ //Todo
+ yaffs_HandleWriteChunkOk(dev,chunk,data,spare);
+ }
+ else
+ {
+ yaffs_HandleWriteChunkError(dev,chunk);
+ }
+ }
+
+ } while(chunk >= 0 && ! writeOk);
+
+ if(attempts > 1)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs write required %d attempts" TENDSTR),attempts));
+ dev->nRetriedWrites+= (attempts - 1);
+ }
+
+ return chunk;
+}
+
+///
+// Functions for robustisizing
+//
+//
+
+static void yaffs_RetireBlock(yaffs_Device *dev,int blockInNAND)
+{
+ // Ding the blockStatus in the first two pages of the block.
+
+ yaffs_Spare spare;
+
+ memset(&spare, 0xff,sizeof(yaffs_Spare));
+
+ spare.blockStatus = 0;
+
+ yaffs_WriteChunkToNAND(dev, blockInNAND * YAFFS_CHUNKS_PER_BLOCK, NULL , &spare);
+ yaffs_WriteChunkToNAND(dev, blockInNAND * YAFFS_CHUNKS_PER_BLOCK + 1, NULL , &spare);
+
+ yaffs_GetBlockInfo(dev,blockInNAND)->blockState = YAFFS_BLOCK_STATE_DEAD;
+ dev->nRetiredBlocks++;
+}
+
+
+
+static int yaffs_RewriteBufferedBlock(yaffs_Device *dev)
+{
+ dev->doingBufferedBlockRewrite = 1;
+ //
+ // Remove erased chunks
+ // Rewrite existing chunks to a new block
+ // Set current write block to the new block
+
+ dev->doingBufferedBlockRewrite = 0;
+
+ return 1;
+}
+
+
+static void yaffs_HandleReadDataError(yaffs_Device *dev,int chunkInNAND)
+{
+ int blockInNAND = chunkInNAND/YAFFS_CHUNKS_PER_BLOCK;
+
+ // Mark the block for retirement
+ yaffs_GetBlockInfo(dev,blockInNAND)->needsRetiring = 1;
+ T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>>Block %d marked for retirement" TENDSTR),blockInNAND));
+
+
+ //TODO
+ // Just do a garbage collection on the affected block then retire the block
+ // NB recursion
+}
+
+
+static void yaffs_CheckWrittenBlock(yaffs_Device *dev,int chunkInNAND)
+{
+}
+
+static void yaffs_HandleWriteChunkOk(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_Spare *spare)
+{
+}
+
+static void yaffs_HandleUpdateChunk(yaffs_Device *dev,int chunkInNAND, const yaffs_Spare *spare)
+{
+}
+
+static void yaffs_HandleWriteChunkError(yaffs_Device *dev,int chunkInNAND)
+{
+ int blockInNAND = chunkInNAND/YAFFS_CHUNKS_PER_BLOCK;
+
+ // Mark the block for retirement
+ yaffs_GetBlockInfo(dev,blockInNAND)->needsRetiring = 1;
+ // Delete the chunk
+ yaffs_DeleteChunk(dev,chunkInNAND);
+}
+
+
+
+
+static int yaffs_VerifyCompare(const __u8 *d0, const __u8 * d1, const yaffs_Spare *s0, const yaffs_Spare *s1)
+{
+
+
+ if( memcmp(d0,d1,YAFFS_BYTES_PER_CHUNK) != 0 ||
+ s0->tagByte0 != s1->tagByte0 ||
+ s0->tagByte1 != s1->tagByte1 ||
+ s0->tagByte2 != s1->tagByte2 ||
+ s0->tagByte3 != s1->tagByte3 ||
+ s0->tagByte4 != s1->tagByte4 ||
+ s0->tagByte5 != s1->tagByte5 ||
+ s0->tagByte6 != s1->tagByte6 ||
+ s0->tagByte7 != s1->tagByte7 ||
+ s0->ecc1[0] != s1->ecc1[0] ||
+ s0->ecc1[1] != s1->ecc1[1] ||
+ s0->ecc1[2] != s1->ecc1[2] ||
+ s0->ecc2[0] != s1->ecc2[0] ||
+ s0->ecc2[1] != s1->ecc2[1] ||
+ s0->ecc2[2] != s1->ecc2[2] )
+ {
+ return 0;
+ }
+
+ return 1;
+}
+
+
+///////////////////////// Object management //////////////////
+// List of spare objects
+// The list is hooked together using the first pointer
+// in the object
+
+// static yaffs_Object *yaffs_freeObjects = NULL;
+
+// static int yaffs_nFreeObjects;
+
+// static yaffs_ObjectList *yaffs_allocatedObjectList = NULL;
+
+// static yaffs_ObjectBucket yaffs_objectBucket[YAFFS_NOBJECT_BUCKETS];
+
+
+static __u16 yaffs_CalcNameSum(const char *name)
+{
+ __u16 sum = 0;
+ __u16 i = 1;
+
+ __u8 *bname = (__u8 *)name;
+ if(bname)
+ {
+ while ((*bname) && (i <=YAFFS_MAX_NAME_LENGTH))
+ {
+#ifdef CONFIG_YAFFS_WINCE
+ sum += toupper(*bname) * i;
+#else
+ sum += (*bname) * i;
+#endif
+ i++;
+ bname++;
+ }
+ }
+ return sum;
+}
+
+void yaffs_SetObjectName(yaffs_Object *obj, const char *name)
+{
+#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
+ if(name && strlen(name) <= YAFFS_SHORT_NAME_LENGTH)
+ {
+ strcpy(obj->shortName,name);
+ }
+ else
+ {
+ obj->shortName[0]='\0';
+ }
+#endif
+ obj->sum = yaffs_CalcNameSum(name);
+}
+
+void yaffs_CalcECC(const __u8 *data, yaffs_Spare *spare)
+{
+ nand_calculate_ecc (data , spare->ecc1);
+ nand_calculate_ecc (&data[256] , spare->ecc2);
+}
+
+void yaffs_CalcTagsECC(yaffs_Tags *tags)
+{
+ // Calculate an ecc
+
+ unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes;
+ unsigned i,j;
+ unsigned ecc = 0;
+ unsigned bit = 0;
+
+ tags->ecc = 0;
+
+ for(i = 0; i < 8; i++)
+ {
+ for(j = 1; j &0xff; j<<=1)
+ {
+ bit++;
+ if(b[i] & j)
+ {
+ ecc ^= bit;
+ }
+ }
+ }
+
+ tags->ecc = ecc;
+
+
+}
+
+int yaffs_CheckECCOnTags(yaffs_Tags *tags)
+{
+ unsigned ecc = tags->ecc;
+
+ yaffs_CalcTagsECC(tags);
+
+ ecc ^= tags->ecc;
+
+ if(ecc && ecc <= 64)
+ {
+ // TODO: Handle the failure better. Retire?
+ unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes;
+
+ ecc--;
+
+ b[ecc / 8] ^= (1 << (ecc & 7));
+
+ // Now recvalc the ecc
+ yaffs_CalcTagsECC(tags);
+
+ return 1; // recovered error
+ }
+ else if(ecc)
+ {
+ // Wierd ecc failure value
+ // TODO Need to do somethiong here
+ return -1; //unrecovered error
+ }
+
+ return 0;
+}
+
+
+///////////////////////// TNODES ///////////////////////
+
+// List of spare tnodes
+// The list is hooked together using the first pointer
+// in the tnode.
+
+//static yaffs_Tnode *yaffs_freeTnodes = NULL;
+
+// static int yaffs_nFreeTnodes;
+
+//static yaffs_TnodeList *yaffs_allocatedTnodeList = NULL;
+
+
+
+// yaffs_CreateTnodes creates a bunch more tnodes and
+// adds them to the tnode free list.
+// Don't use this function directly
+
+static int yaffs_CreateTnodes(yaffs_Device *dev,int nTnodes)
+{
+ int i;
+ yaffs_Tnode *newTnodes;
+ yaffs_TnodeList *tnl;
+
+ if(nTnodes < 1) return YAFFS_OK;
+
+ // make these things
+
+ newTnodes = YMALLOC(nTnodes * sizeof(yaffs_Tnode));
+
+ if (!newTnodes)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("yaffs: Could not allocate Tnodes"TENDSTR)));
+ return YAFFS_FAIL;
+ }
+
+ // Hook them into the free list
+ for(i = 0; i < nTnodes - 1; i++)
+ {
+ newTnodes[i].internal[0] = &newTnodes[i+1];
+ }
+
+ newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
+ dev->freeTnodes = newTnodes;
+ dev->nFreeTnodes+= nTnodes;
+ dev->nTnodesCreated += nTnodes;
+
+ // Now add this bunch of tnodes to a list for freeing up.
+ // NB If we can't add this to the management list it isn't fatal
+ // but it just means we can't free this bunch of tnodes later.
+ tnl = YMALLOC(sizeof(yaffs_TnodeList));
+ if(!tnl)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("yaffs: Could not add tnodes to management list" TENDSTR)));
+
+ }
+ else
+ {
+ tnl->tnodes = newTnodes;
+ tnl->next = dev->allocatedTnodeList;
+ dev->allocatedTnodeList = tnl;
+ }
+
+
+ T(YAFFS_TRACE_ALLOCATE,(TSTR("yaffs: Tnodes added" TENDSTR)));
+
+
+ return YAFFS_OK;
+}
+
+
+// GetTnode gets us a clean tnode. Tries to make allocate more if we run out
+static yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev)
+{
+ yaffs_Tnode *tn = NULL;
+
+ // If there are none left make more
+ if(!dev->freeTnodes)
+ {
+ yaffs_CreateTnodes(dev,YAFFS_ALLOCATION_NTNODES);
+ }
+
+ if(dev->freeTnodes)
+ {
+ tn = dev->freeTnodes;
+ dev->freeTnodes = dev->freeTnodes->internal[0];
+ dev->nFreeTnodes--;
+ // zero out
+ memset(tn,0,sizeof(yaffs_Tnode));
+ }
+
+
+ return tn;
+}
+
+
+// FreeTnode frees up a tnode and puts it back on the free list
+static void yaffs_FreeTnode(yaffs_Device*dev, yaffs_Tnode *tn)
+{
+ tn->internal[0] = dev->freeTnodes;
+ dev->freeTnodes = tn;
+ dev->nFreeTnodes++;
+}
+
+
+static void yaffs_DeinitialiseTnodes(yaffs_Device*dev)
+{
+ // Free the list of allocated tnodes
+
+ while(dev->allocatedTnodeList)
+ {
+ YFREE(dev->allocatedTnodeList->tnodes);
+ dev->allocatedTnodeList = dev->allocatedTnodeList->next;
+ }
+
+ dev->freeTnodes = NULL;
+ dev->nFreeTnodes = 0;
+}
+
+static void yaffs_InitialiseTnodes(yaffs_Device*dev)
+{
+ dev->allocatedTnodeList = NULL;
+ dev->freeTnodes = NULL;
+ dev->nFreeTnodes = 0;
+ dev->nTnodesCreated = 0;
+
+}
+
+#if 0
+void yaffs_TnodeTest(yaffs_Device *dev)
+{
+
+ int i;
+ int j;
+ yaffs_Tnode *tn[1000];
+
+ YINFO("Testing TNodes");
+
+ for(j = 0; j < 50; j++)
+ {
+ for(i = 0; i < 1000; i++)
+ {
+ tn[i] = yaffs_GetTnode(dev);
+ if(!tn[i])
+ {
+ YALERT("Getting tnode failed");
+ }
+ }
+ for(i = 0; i < 1000; i+=3)
+ {
+ yaffs_FreeTnode(dev,tn[i]);
+ tn[i] = NULL;
+ }
+
+ }
+}
+#endif
+
+
+////////////////// END OF TNODE MANIPULATION ///////////////////////////
+
+/////////////// Functions to manipulate the look-up tree (made up of tnodes)
+// The look up tree is represented by the top tnode and the number of topLevel
+// in the tree. 0 means only the level 0 tnode is in the tree.
+
+
+// FindLevel0Tnode finds the level 0 tnode, if one exists.
+// Used when reading.....
+static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,yaffs_FileStructure *fStruct, __u32 chunkId)
+{
+
+ yaffs_Tnode *tn = fStruct->top;
+ __u32 i;
+ int requiredTallness;
+ int level = fStruct->topLevel;
+
+ // Check sane level and chunk Id
+ if(level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
+ {
+// char str[50];
+// sprintf(str,"Bad level %d",level);
+// YALERT(str);
+ return NULL;
+ }
+
+ if(chunkId > YAFFS_MAX_CHUNK_ID)
+ {
+// char str[50];
+// sprintf(str,"Bad chunkId %d",chunkId);
+// YALERT(str);
+ return NULL;
+ }
+
+ // First check we're tall enough (ie enough topLevel)
+
+ i = chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS);
+ requiredTallness = 0;
+ while(i)
+ {
+ i >>= YAFFS_TNODES_INTERNAL_BITS;
+ requiredTallness++;
+ }
+
+
+ if(requiredTallness > fStruct->topLevel)
+ {
+ // Not tall enough, so we can't find it, return NULL.
+ return NULL;
+ }
+
+
+ // Traverse down to level 0
+ while (level > 0 && tn)
+ {
+ tn = tn->internal[(chunkId >>(/* dev->chunkGroupBits + */ YAFFS_TNODES_LEVEL0_BITS + (level-1) * YAFFS_TNODES_INTERNAL_BITS)) &
+ YAFFS_TNODES_INTERNAL_MASK];
+ level--;
+
+ }
+
+ return tn;
+}
+
+// AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
+// This happens in two steps:
+// 1. If the tree isn't tall enough, then make it taller.
+// 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
+//
+// Used when modifying the tree.
+//
+static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev, yaffs_FileStructure *fStruct, __u32 chunkId)
+{
+
+ yaffs_Tnode *tn;
+
+ int requiredTallness;
+ int i;
+ int l;
+
+ __u32 x;
+
+
+ //T((TSTR("AddOrFind topLevel=%d, chunk=%d"),fStruct->topLevel,chunkId));
+
+ // Check sane level and page Id
+ if(fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL)
+ {
+// char str[50];
+// sprintf(str,"Bad level %d",fStruct->topLevel);
+// YALERT(str);
+ return NULL;
+ }
+
+ if(chunkId > YAFFS_MAX_CHUNK_ID)
+ {
+// char str[50];
+// sprintf(str,"Bad chunkId %d",chunkId);
+// YALERT(str);
+ return NULL;
+ }
+
+ // First check we're tall enough (ie enough topLevel)
+
+ x = chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS);
+ requiredTallness = 0;
+ while(x)
+ {
+ x >>= YAFFS_TNODES_INTERNAL_BITS;
+ requiredTallness++;
+ }
+
+ //T((TSTR(" required=%d"),requiredTallness));
+
+
+ if(requiredTallness > fStruct->topLevel)
+ {
+ // Not tall enough,gotta make the tree taller
+ for(i = fStruct->topLevel; i < requiredTallness; i++)
+ {
+ //T((TSTR(" add new top")));
+
+ tn = yaffs_GetTnode(dev);
+
+ if(tn)
+ {
+ tn->internal[0] = fStruct->top;
+ fStruct->top = tn;
+ }
+ else
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("yaffs: no more tnodes" TENDSTR)));
+ }
+ }
+
+ fStruct->topLevel = requiredTallness;
+ }
+
+
+ // Traverse down to level 0, adding anything we need
+
+ l = fStruct->topLevel;
+ tn = fStruct->top;
+ while (l > 0 && tn)
+ {
+ x = (chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS + (l-1) * YAFFS_TNODES_INTERNAL_BITS)) &
+ YAFFS_TNODES_INTERNAL_MASK;
+
+ //T((TSTR(" [%d:%d]"),l,i));
+
+ if(!tn->internal[x])
+ {
+ //T((TSTR(" added")));
+
+ tn->internal[x] = yaffs_GetTnode(dev);
+ }
+
+ tn = tn->internal[x];
+ l--;
+
+ }
+
+ //TSTR(TENDSTR)));
+
+ return tn;
+}
+
+// DeleteWorker scans backwards through the tnode tree and deletes all the
+// chunks and tnodes in the file
+// Returns 1 if the tree was deleted. Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
+
+static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, int chunkOffset,int *limit)
+{
+ int i;
+ int chunkInInode;
+ int theChunk;
+ yaffs_Tags tags;
+ int found;
+ int chunkDeleted;
+ int allDone = 1;
+
+
+ if(tn)
+ {
+ if(level > 0)
+ {
+
+ for(i = YAFFS_NTNODES_INTERNAL -1; allDone && i >= 0; i--)
+ {
+ if(tn->internal[i])
+ {
+ if(limit && (*limit) < 0)
+ {
+ allDone = 0;
+ }
+ else
+ {
+ allDone = yaffs_DeleteWorker(in,tn->internal[i],level - 1,
+ (chunkOffset << YAFFS_TNODES_INTERNAL_BITS ) + i ,limit);
+ }
+ if(allDone)
+ {
+ yaffs_FreeTnode(in->myDev,tn->internal[i]);
+ tn->internal[i] = NULL;
+ }
+ }
+
+ }
+ return (allDone) ? 1 : 0;
+ }
+ else if(level == 0)
+ {
+ for(i = YAFFS_NTNODES_LEVEL0 -1; i >= 0; i--) //NB Don't apply the limit here, always delete a whole level0
+ {
+ if(tn->level0[i])
+ {
+ int j;
+
+ chunkInInode = (chunkOffset << YAFFS_TNODES_LEVEL0_BITS ) + i;
+
+ theChunk = tn->level0[i] << in->myDev->chunkGroupBits;
+
+ // Now we need to search for it
+ for(j = 0,found = 0; theChunk && j < in->myDev->chunkGroupSize && !found; j++)
+ {
+ yaffs_ReadChunkTagsFromNAND(in->myDev,theChunk,&tags,&chunkDeleted);
+ if(yaffs_TagsMatch(&tags,in->objectId,chunkInInode,chunkDeleted))
+ {
+ // found it;
+ found = 1;
+
+ }
+ else
+ {
+ theChunk++;
+ }
+ }
+
+ if(found)
+ {
+ yaffs_DeleteChunk(in->myDev,theChunk);
+ in->nDataChunks--;
+ if(limit)
+ {
+ *limit = *limit-1;
+ }
+
+ }
+
+ tn->level0[i] = 0;
+ }
+
+ }
+ return 1;
+
+
+ }
+
+ }
+
+ return 1;
+
+}
+
+
+
+
+// Pruning removes any part of the file structure tree that is beyond the
+// bounds of the file (ie that does not point to chunks).
+//
+// A file should only get pruned when its size is reduced.
+//
+// Before pruning, the chunks must be pulled from the tree and the
+// level 0 tnode entries must be zeroed out.
+// Could also use this for file deletion, but that's probably better handled
+// by a special case.
+
+// yaffs_PruneWorker should only be called by yaffs_PruneFileStructure()
+
+static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn, __u32 level, int del0)
+{
+ int i;
+ int hasData;
+
+ if(tn)
+ {
+ hasData = 0;
+
+ for(i = 0; i < YAFFS_NTNODES_INTERNAL; i++)
+ {
+ if(tn->internal[i] && level > 0)
+ {
+ tn->internal[i] = yaffs_PruneWorker(dev,tn->internal[i],level - 1, ( i == 0) ? del0 : 1);
+ }
+
+ if(tn->internal[i])
+ {
+ hasData++;
+ }
+ }
+
+ if(hasData == 0 && del0)
+ {
+ // Free and return NULL
+
+ yaffs_FreeTnode(dev,tn);
+ tn = NULL;
+ }
+
+ }
+
+ return tn;
+
+}
+
+static int yaffs_PruneFileStructure(yaffs_Device *dev, yaffs_FileStructure *fStruct)
+{
+ int i;
+ int hasData;
+ int done = 0;
+ yaffs_Tnode *tn;
+
+ if(fStruct->topLevel > 0)
+ {
+ fStruct->top = yaffs_PruneWorker(dev,fStruct->top, fStruct->topLevel,0);
+
+ // Now we have a tree with all the non-zero branches NULL but the height
+ // is the same as it was.
+ // Let's see if we can trim internal tnodes to shorten the tree.
+ // We can do this if only the 0th element in the tnode is in use
+ // (ie all the non-zero are NULL)
+
+ while(fStruct->topLevel && !done)
+ {
+ tn = fStruct->top;
+
+ hasData = 0;
+ for(i = 1; i <YAFFS_NTNODES_INTERNAL; i++)
+ {
+ if(tn->internal[i])
+ {
+ hasData++;
+ }
+ }
+
+ if(!hasData)
+ {
+ fStruct->top = tn->internal[0];
+ fStruct->topLevel--;
+ yaffs_FreeTnode(dev,tn);
+ }
+ else
+ {
+ done = 1;
+ }
+ }
+ }
+
+ return YAFFS_OK;
+}
+
+
+
+
+
+/////////////////////// End of File Structure functions. /////////////////
+
+// yaffs_CreateFreeObjects creates a bunch more objects and
+// adds them to the object free list.
+static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)
+{
+ int i;
+ yaffs_Object *newObjects;
+ yaffs_ObjectList *list;
+
+ if(nObjects < 1) return YAFFS_OK;
+
+ // make these things
+
+ newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
+
+ if (!newObjects)
+ {
+ T(YAFFS_TRACE_ALLOCATE,(TSTR("yaffs: Could not allocate more objects" TENDSTR)));
+ return YAFFS_FAIL;
+ }
+
+ // Hook them into the free list
+ for(i = 0; i < nObjects - 1; i++)
+ {
+ (yaffs_Object *)newObjects[i].siblings.next = &newObjects[i+1];
+ }
+
+ newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
+ dev->freeObjects = newObjects;
+ dev->nFreeObjects+= nObjects;
+ dev->nObjectsCreated+= nObjects;
+
+ // Now add this bunch of Objects to a list for freeing up.
+
+ list = YMALLOC(sizeof(yaffs_ObjectList));
+ if(!list)
+ {
+ T(YAFFS_TRACE_ALLOCATE,(TSTR("Could not add objects to management list" TENDSTR)));
+ }
+ else
+ {
+ list->objects = newObjects;
+ list->next = dev->allocatedObjectList;
+ dev->allocatedObjectList = list;
+ }
+
+
+
+ return YAFFS_OK;
+}
+
+
+// AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out
+static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
+{
+ yaffs_Object *tn = NULL;
+
+ // If there are none left make more
+ if(!dev->freeObjects)
+ {
+ yaffs_CreateFreeObjects(dev,YAFFS_ALLOCATION_NOBJECTS);
+ }
+
+ if(dev->freeObjects)
+ {
+ tn = dev->freeObjects;
+ dev->freeObjects = (yaffs_Object *)(dev->freeObjects->siblings.next);
+ dev->nFreeObjects--;
+
+ // Now sweeten it up...
+
+ memset(tn,0,sizeof(yaffs_Object));
+ tn->myDev = dev;
+ tn->chunkId = -1;
+ tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
+ INIT_LIST_HEAD(&(tn->hardLinks));
+ INIT_LIST_HEAD(&(tn->hashLink));
+ INIT_LIST_HEAD(&tn->siblings);
+
+ // Add it to the lost and found directory.
+ // NB Can't put root or lostNFound in lostNFound so
+ // check if lostNFound exists first
+ if(dev->lostNFoundDir)
+ {
+ yaffs_AddObjectToDirectory(dev->lostNFoundDir,tn);
+ }
+ }
+
+
+ return tn;
+}
+
+static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev,int number,__u32 mode)
+{
+
+ yaffs_Object *obj = yaffs_CreateNewObject(dev,number,YAFFS_OBJECT_TYPE_DIRECTORY);
+ if(obj)
+ {
+ obj->fake = 1; // it is fake so it has no NAND presence...
+ obj->renameAllowed= 0; // ... and we're not allowed to rename it...
+ obj->unlinkAllowed= 0; // ... or unlink it
+ obj->deleted = 0;
+ obj->unlinked = 0;
+ obj->st_mode = mode;
+ obj->myDev = dev;
+ obj->chunkId = 0; // Not a valid chunk.
+ }
+
+ return obj;
+
+}
+
+
+static void yaffs_UnhashObject(yaffs_Object *tn)
+{
+ int bucket;
+ yaffs_Device *dev = tn->myDev;
+
+
+ // If it is still linked into the bucket list, free from the list
+ if(!list_empty(&tn->hashLink))
+ {
+ list_del_init(&tn->hashLink);
+ bucket = yaffs_HashFunction(tn->objectId);
+ dev->objectBucket[bucket].count--;
+ }
+
+}
+
+
+// FreeObject frees up a Object and puts it back on the free list
+static void yaffs_FreeObject(yaffs_Object *tn)
+{
+
+ yaffs_Device *dev = tn->myDev;
+
+ yaffs_UnhashObject(tn);
+
+ // Link into the free list.
+ (yaffs_Object *)(tn->siblings.next) = dev->freeObjects;
+ dev->freeObjects = tn;
+ dev->nFreeObjects++;
+}
+
+
+
+
+static void yaffs_DeinitialiseObjects(yaffs_Device *dev)
+{
+ // Free the list of allocated Objects
+
+ while( dev->allocatedObjectList)
+ {
+ YFREE(dev->allocatedObjectList->objects);
+ dev->allocatedObjectList = dev->allocatedObjectList->next;
+ }
+
+ dev->freeObjects = NULL;
+ dev->nFreeObjects = 0;
+}
+
+static void yaffs_InitialiseObjects(yaffs_Device *dev)
+{
+ int i;
+
+ dev->allocatedObjectList = NULL;
+ dev->freeObjects = NULL;
+ dev->nFreeObjects = 0;
+
+ for(i = 0; i < YAFFS_NOBJECT_BUCKETS; i++)
+ {
+ INIT_LIST_HEAD(&dev->objectBucket[i].list);
+ dev->objectBucket[i].count = 0;
+ }
+
+}
+
+
+
+
+
+
+int yaffs_FindNiceObjectBucket(yaffs_Device *dev)
+{
+ static int x = 0;
+ int i;
+ int l = 999;
+ int lowest = 999999;
+
+
+ // First let's see if we can find one that's empty.
+
+ for(i = 0; i < 10 && lowest > 0; i++)
+ {
+ x++;
+ x %= YAFFS_NOBJECT_BUCKETS;
+ if(dev->objectBucket[x].count < lowest)
+ {
+ lowest = dev->objectBucket[x].count;
+ l = x;
+ }
+
+ }
+
+ // If we didn't find an empty list, then try
+ // looking a bit further for a short one
+
+ for(i = 0; i < 10 && lowest > 3; i++)
+ {
+ x++;
+ x %= YAFFS_NOBJECT_BUCKETS;
+ if(dev->objectBucket[x].count < lowest)
+ {
+ lowest = dev->objectBucket[x].count;
+ l = x;
+ }
+
+ }
+
+ return l;
+}
+
+static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
+{
+ int bucket = yaffs_FindNiceObjectBucket(dev);
+
+ // Now find an object value that has not already been taken
+ // by scanning the list.
+
+ int found = 0;
+ struct list_head *i;
+
+ __u32 n = (__u32)bucket;
+
+ //yaffs_CheckObjectHashSanity();
+
+ while(!found)
+ {
+ found = 1;
+ n += YAFFS_NOBJECT_BUCKETS;
+ if(1 ||dev->objectBucket[bucket].count > 0)
+ {
+ list_for_each(i,&dev->objectBucket[bucket].list)
+ {
+ // If there is already one in the list
+ if(list_entry(i, yaffs_Object,hashLink)->objectId == n)
+ {
+ found = 0;
+ }
+ }
+ }
+ }
+
+ //T(("bucket %d count %d inode %d\n",bucket,yaffs_objectBucket[bucket].count,n);
+
+ return n;
+}
+
+void yaffs_HashObject(yaffs_Object *in)
+{
+ int bucket = yaffs_HashFunction(in->objectId);
+ yaffs_Device *dev = in->myDev;
+
+ if(!list_empty(&in->hashLink))
+ {
+ //YINFO("!!!");
+ }
+
+
+ list_add(&in->hashLink,&dev->objectBucket[bucket].list);
+ dev->objectBucket[bucket].count++;
+
+}
+
+yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev,__u32 number)
+{
+ int bucket = yaffs_HashFunction(number);
+ struct list_head *i;
+ yaffs_Object *in;
+
+ list_for_each(i,&dev->objectBucket[bucket].list)
+ {
+ // Look if it is in the list
+ in = list_entry(i, yaffs_Object,hashLink);
+ if(in->objectId == number)
+ {
+ return in;
+ }
+ }
+
+ return NULL;
+}
+
+
+
+yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev,int number,yaffs_ObjectType type)
+{
+
+ yaffs_Object *theObject;
+
+ if(number < 0)
+ {
+ number = yaffs_CreateNewObjectNumber(dev);
+ }
+
+ theObject = yaffs_AllocateEmptyObject(dev);
+
+ if(theObject)
+ {
+ theObject->fake = 0;
+ theObject->renameAllowed = 1;
+ theObject->unlinkAllowed = 1;
+ theObject->objectId = number;
+ yaffs_HashObject(theObject);
+ theObject->variantType = type;
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_WinFileTimeNow(theObject->win_atime);
+ theObject->win_ctime[0] = theObject->win_mtime[0] = theObject->win_atime[0];
+ theObject->win_ctime[1] = theObject->win_mtime[1] = theObject->win_atime[1];
+
+#else
+ theObject->st_atime = theObject->st_mtime = theObject->st_ctime = CURRENT_TIME;
+#endif
+ switch(type)
+ {
+ case YAFFS_OBJECT_TYPE_FILE:
+ theObject->variant.fileVariant.fileSize = 0;
+ theObject->variant.fileVariant.scannedFileSize = 0;
+ theObject->variant.fileVariant.topLevel = 0;
+ theObject->variant.fileVariant.top = yaffs_GetTnode(dev);
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ INIT_LIST_HEAD(&theObject->variant.directoryVariant.children);
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ // No action required
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ // No action required
+ break;
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ // No action required
+ break;
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ // todo this should not happen
+ break;
+ }
+ }
+
+ return theObject;
+}
+
+yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev, int number,yaffs_ObjectType type)
+{
+ yaffs_Object *theObject = NULL;
+
+ if(number > 0)
+ {
+ theObject = yaffs_FindObjectByNumber(dev,number);
+ }
+
+ if(!theObject)
+ {
+ theObject = yaffs_CreateNewObject(dev,number,type);
+ }
+
+ return theObject;
+
+}
+
+char *yaffs_CloneString(const char *str)
+{
+ char *newStr = NULL;
+
+ if(str && *str)
+ {
+ newStr = YMALLOC(strlen(str) + 1);
+ strcpy(newStr,str);
+ }
+
+ return newStr;
+
+}
+
+//
+// Mknod (create) a new object.
+// equivalentObject only has meaning for a hard link;
+// aliasString only has meaning for a sumlink.
+// rdev only has meaning for devices (a subset of special objects)
+yaffs_Object *yaffs_MknodObject( yaffs_ObjectType type,
+ yaffs_Object *parent,
+ const char *name,
+ __u32 mode,
+ __u32 uid,
+ __u32 gid,
+ yaffs_Object *equivalentObject,
+ const char *aliasString,
+ __u32 rdev)
+{
+ yaffs_Object *in;
+
+ yaffs_Device *dev = parent->myDev;
+
+ // Check if the entry exists. If it does then fail the call since we don't want a dup.
+ if(yaffs_FindObjectByName(parent,name))
+ {
+ return NULL;
+ }
+
+ in = yaffs_CreateNewObject(dev,-1,type);
+
+ if(in)
+ {
+ in->chunkId = -1;
+ in->valid = 1;
+ in->variantType = type;
+
+ in->st_mode = mode;
+
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_WinFileTimeNow(in->win_atime);
+ in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
+ in->win_ctime[1] = in->win_mtime[1] = in->win_atime[0];
+
+#else
+ in->st_atime = in->st_mtime = in->st_ctime = CURRENT_TIME;
+ in->st_rdev = rdev;
+ in->st_uid = uid;
+ in->st_gid = gid;
+#endif
+ in->nDataChunks = 0;
+
+ yaffs_SetObjectName(in,name);
+ in->dirty = 1;
+
+ yaffs_AddObjectToDirectory(parent,in);
+
+ in->myDev = parent->myDev;
+
+
+ switch(type)
+ {
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ in->variant.symLinkVariant.alias = yaffs_CloneString(aliasString);
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ in->variant.hardLinkVariant.equivalentObject = equivalentObject;
+ in->variant.hardLinkVariant.equivalentObjectId = equivalentObject->objectId;
+ list_add(&in->hardLinks,&equivalentObject->hardLinks);
+ break;
+ case YAFFS_OBJECT_TYPE_FILE: // do nothing
+ case YAFFS_OBJECT_TYPE_DIRECTORY: // do nothing
+ case YAFFS_OBJECT_TYPE_SPECIAL: // do nothing
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ break;
+ }
+
+ if(yaffs_GetNumberOfFreeChunks(dev) <= 0 ||
+ yaffs_UpdateObjectHeader(in,name,0) < 0)
+ {
+ // Could not create the object header, fail the creation
+ yaffs_UnlinkWorker(in);
+ in = NULL;
+ }
+
+ }
+
+ return in;
+}
+
+yaffs_Object *yaffs_MknodFile(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid)
+{
+ return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE,parent,name,mode,uid,gid,NULL,NULL,0);
+}
+
+yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid)
+{
+ return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY,parent,name,mode,uid,gid,NULL,NULL,0);
+}
+
+yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
+{
+ return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY,parent,name,mode,uid,gid,NULL,NULL,rdev);
+}
+
+yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid,const char *alias)
+{
+ return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK,parent,name,mode,uid,gid,NULL,alias,0);
+}
+
+// NB yaffs_Link returns the object id of the equivalent object.
+yaffs_Object *yaffs_Link(yaffs_Object *parent, const char *name, yaffs_Object *equivalentObject)
+{
+ // Get the real object in case we were fed a hard link as an equivalent object
+ equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
+
+ if(yaffs_MknodObject(YAFFS_OBJECT_TYPE_HARDLINK,parent,name,0,0,0,equivalentObject,NULL,0))
+ {
+ return equivalentObject;
+ }
+ else
+ {
+ return NULL;
+ }
+
+}
+
+
+static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir, const char *newName,int force)
+{
+ int unlinkOp;
+
+ if(newDir == NULL)
+ {
+ newDir = obj->parent; // use the old directory
+ }
+
+ unlinkOp = (newDir == obj->myDev->unlinkedDir && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
+
+ // If the object is a file going into the unlinked directory, then it is OK to just stuff it in since
+ // duplicate names are allowed.
+ // Otherwise only proceed if the new name does not exist and if we're putting it into a directory.
+ if( (unlinkOp||
+ force ||
+ !yaffs_FindObjectByName(newDir,newName)) &&
+ newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
+ {
+ yaffs_SetObjectName(obj,newName);
+ obj->dirty = 1;
+
+ yaffs_AddObjectToDirectory(newDir,obj);
+
+ if(unlinkOp) obj->unlinked = 1;
+
+
+ if(yaffs_UpdateObjectHeader(obj,newName,0) >= 0)
+ {
+ return YAFFS_OK;
+ }
+ }
+
+ return YAFFS_FAIL;
+}
+
+
+
+int yaffs_RenameObject(yaffs_Object *oldDir, const char *oldName, yaffs_Object *newDir, const char *newName)
+{
+ yaffs_Object *obj;
+ int force = 0;
+
+#ifdef CONFIG_YAFFS_WINCE
+ // Special case for WinCE.
+ // While look-up is case insensitive, the name isn't.
+ // THerefore we might want to change x.txt to X.txt
+ if(oldDir == newDir && _stricmp(oldName,newName) == 0)
+ {
+ force = 1;
+ }
+#endif
+
+ obj = yaffs_FindObjectByName(oldDir,oldName);
+ if(obj && obj->renameAllowed)
+ {
+ return yaffs_ChangeObjectName(obj,newDir,newName,force);
+ }
+ return YAFFS_FAIL;
+}
+
+
+
+static int yaffs_CheckObjectHashSanity(yaffs_Device *dev)
+{
+ // Scan the buckets and check that the lists
+ // have as many members as the count says there are
+ int bucket;
+ int countEm;
+ struct list_head *j;
+ int ok = YAFFS_OK;
+
+ for(bucket = 0; bucket < YAFFS_NOBJECT_BUCKETS; bucket++)
+ {
+ countEm = 0;
+
+ list_for_each(j,&dev->objectBucket[bucket].list)
+ {
+ countEm++;
+ }
+
+ if(countEm != dev->objectBucket[bucket].count)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("Inode hash inconsistency" TENDSTR)));
+ ok = YAFFS_FAIL;
+ }
+ }
+
+ return ok;
+}
+
+#if 0
+void yaffs_ObjectTest(yaffs_Device *dev)
+{
+ yaffs_Object *in[1000];
+ int inNo[1000];
+ yaffs_Object *inold[1000];
+ int i;
+ int j;
+
+ memset(in,0,1000*sizeof(yaffs_Object *));
+ memset(inold,0,1000*sizeof(yaffs_Object *));
+
+ yaffs_CheckObjectHashSanity(dev);
+
+ for(j = 0; j < 10; j++)
+ {
+ //T(("%d\n",j));
+
+ for(i = 0; i < 1000; i++)
+ {
+ in[i] = yaffs_CreateNewObject(dev,-1,YAFFS_OBJECT_TYPE_FILE);
+ if(!in[i])
+ {
+ YINFO("No more inodes");
+ }
+ else
+ {
+ inNo[i] = in[i]->objectId;
+ }
+ }
+
+ for(i = 0; i < 1000; i++)
+ {
+ if(yaffs_FindObjectByNumber(dev,inNo[i]) != in[i])
+ {
+ //T(("Differnce in look up test\n"));
+ }
+ else
+ {
+ // T(("Look up ok\n"));
+ }
+ }
+
+ yaffs_CheckObjectHashSanity(dev);
+
+ for(i = 0; i < 1000; i+=3)
+ {
+ yaffs_FreeObject(in[i]);
+ in[i] = NULL;
+ }
+
+
+ yaffs_CheckObjectHashSanity(dev);
+ }
+
+}
+
+#endif
+
+/////////////////////////// Block Management and Page Allocation ///////////////////
+
+
+static int yaffs_InitialiseBlocks(yaffs_Device *dev,int nBlocks)
+{
+ dev->allocationBlock = -1; // force it to get a new one
+ //Todo we're assuming the malloc will pass.
+ dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
+ if(dev->blockInfo)
+ {
+ memset(dev->blockInfo,0,nBlocks * sizeof(yaffs_BlockInfo));
+ return YAFFS_OK;
+ }
+ return YAFFS_FAIL;
+
+}
+
+static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
+{
+ YFREE(dev->blockInfo);
+}
+
+// FindDiretiestBlock is used to select the dirtiest block (or close enough)
+// for garbage collection.
+
+static int yaffs_FindDirtiestBlock(yaffs_Device *dev)
+{
+
+ int b = dev->currentDirtyChecker;
+
+ int i;
+ int dirtiest = -1;
+ int pagesInUse = 100; // silly big number
+ yaffs_BlockInfo *bi;
+
+ for(i = dev->startBlock; i <= dev->endBlock && pagesInUse > 2 ; i++)
+ {
+ b++;
+ if ( b < dev->startBlock || b > dev->endBlock)
+ {
+ b = dev->startBlock;
+ }
+
+ if(b < dev->startBlock || b > dev->endBlock)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>> Block %d is not valid" TENDSTR),b));
+ YBUG();
+ }
+
+ bi = yaffs_GetBlockInfo(dev,b);
+
+ if(bi->blockState == YAFFS_BLOCK_STATE_FULL &&
+ bi->pagesInUse < pagesInUse)
+ {
+ dirtiest = b;
+ pagesInUse = bi->pagesInUse;
+ }
+ }
+
+ dev->currentDirtyChecker = b;
+
+ return dirtiest;
+}
+
+
+static void yaffs_BlockBecameDirty(yaffs_Device *dev,int blockNo)
+{
+ yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,blockNo);
+
+ int erasedOk = 0;
+
+ // If the block is still healthy erase it and mark as clean.
+ // If the block has had a data failure, then retire it.
+ bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
+
+ if(!bi->needsRetiring)
+ {
+ erasedOk = yaffs_EraseBlockInNAND(dev,blockNo);
+ if(!erasedOk)
+ {
+ T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>> Erasure failed %d" TENDSTR),blockNo));
+ }
+ }
+
+ if( erasedOk )
+ {
+ bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
+ dev->nErasedBlocks++;
+ bi->pagesInUse = 0;
+ bi->pageBits = 0;
+
+ T(YAFFS_TRACE_ERASE,(TSTR("Erased block %d" TENDSTR),blockNo));
+ }
+ else
+ {
+ yaffs_RetireBlock(dev,blockNo);
+ T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>> Block %d retired" TENDSTR),blockNo));
+ }
+}
+
+
+static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
+{
+ int i;
+ yaffs_BlockInfo *bi;
+
+ if(dev->nErasedBlocks < 1)
+ {
+ // Hoosterman we've got a problem.
+ // Can't get space to gc
+ T(YAFFS_TRACE_ERROR, (TSTR("yaffs tradgedy: no space during gc" TENDSTR)));
+
+ return -1;
+ }
+
+ // Find an empty block.
+
+ for(i = dev->startBlock; i <= dev->endBlock; i++)
+ {
+ bi = yaffs_GetBlockInfo(dev,i);
+ if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY)
+ {
+ bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
+ dev->nErasedBlocks--;
+ return i;
+ }
+ }
+
+ return -1;
+}
+
+
+
+static int yaffs_AllocateChunk(yaffs_Device *dev,int useReserve)
+{
+ int retVal;
+ yaffs_BlockInfo *bi;
+
+ if(dev->allocationBlock < 0)
+ {
+ // Get next block to allocate off
+ dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
+ dev->allocationPage = 0;
+ }
+
+ if(!useReserve && dev->nErasedBlocks <= YAFFS_RESERVED_BLOCKS)
+ {
+ // Not enough space to allocate unless we're allowed to use the reserve.
+ return -1;
+ }
+
+ // Next page please....
+ if(dev->allocationBlock >= 0)
+ {
+ bi = yaffs_GetBlockInfo(dev,dev->allocationBlock);
+
+ retVal = (dev->allocationBlock * YAFFS_CHUNKS_PER_BLOCK) +
+ dev->allocationPage;
+ bi->pagesInUse++;
+ bi->pageBits |= (1 << (dev->allocationPage));
+
+ dev->allocationPage++;
+
+ dev->nFreeChunks--;
+
+ // If the block is full set the state to full
+ if(dev->allocationPage >= YAFFS_CHUNKS_PER_BLOCK)
+ {
+ bi->blockState = YAFFS_BLOCK_STATE_FULL;
+ dev->allocationBlock = -1;
+ }
+
+
+ return retVal;
+
+ }
+ T(YAFFS_TRACE_ERROR,(TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
+
+ return -1;
+}
+
+// To determine if we have enough space we just look at the
+// number of erased blocks.
+// The cache is allowed to use reserved blocks.
+
+int yaffs_CheckSpaceForChunkCache(yaffs_Device *dev)
+{
+ return (dev->nErasedBlocks >= YAFFS_RESERVED_BLOCKS);
+}
+
+
+int yaffs_GarbageCollectBlock(yaffs_Device *dev,int block)
+{
+ int oldChunk;
+ int newChunk;
+ __u32 mask;
+
+
+ yaffs_Spare spare;
+ yaffs_Tags tags;
+ __u8 buffer[YAFFS_BYTES_PER_CHUNK];
+
+ yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,block);
+
+ yaffs_Object *object;
+
+ //T(("Collecting block %d n %d bits %x\n",block, bi->pagesInUse, bi->pageBits));
+
+ for(mask = 1,oldChunk = block * YAFFS_CHUNKS_PER_BLOCK;
+ mask && bi->pageBits;
+ mask <<= 1, oldChunk++ )
+ {
+ if(bi->pageBits & mask)
+ {
+
+ // This page is in use and needs to be copied off
+
+ dev->nGCCopies++;
+
+ //T(("copying page %x from %d to %d\n",mask,oldChunk,newChunk));
+
+ yaffs_ReadChunkFromNAND(dev,oldChunk,buffer, &spare,1);
+
+ yaffs_GetTagsFromSpare(dev,&spare,&tags);
+
+ object = yaffs_FindObjectByNumber(dev,tags.objectId);
+
+ if(object && object->deleted && tags.chunkId != 0)
+ {
+ // Data chunk in a deleted file, throw it away
+ // It's a deleted data chunk,
+ // No need to copy this, just forget about it and fix up the
+ // object.
+
+ yaffs_PutChunkIntoFile(object, tags.chunkId, 0,0);
+ object->nDataChunks--;
+ }
+ else if( 0 /* Todo object && object->deleted && object->nDataChunks == 0 */)
+ {
+ // Deleted object header with no data chunks.
+ // Can be discarded
+ object->chunkId = 0;
+ //Todo some clean up
+
+ }
+ else if(object)
+ {
+ // It's either a data chunk in a live file or
+ // an ObjectHeader, so we're interested in it.
+ // NB Need to keep the ObjectHeaders of deleted files
+ // until the whole file has been deleted off
+ tags.serialNumber++;
+ yaffs_LoadTagsIntoSpare(&spare,&tags);
+
+
+ newChunk = yaffs_WriteNewChunkToNAND(dev, buffer, &spare,1);
+
+ if(newChunk < 0)
+ {
+ return YAFFS_FAIL;
+ }
+
+ // Ok, now fix up the Tnodes etc.
+
+ if(tags.chunkId == 0)
+ {
+ // It's a header
+ object->chunkId = newChunk;
+ }
+ else
+ {
+ // It's a data chunk
+ yaffs_PutChunkIntoFile(object, tags.chunkId, newChunk,0);
+ }
+ }
+
+ yaffs_DeleteChunk(dev,oldChunk);
+
+ }
+ }
+
+ return YAFFS_OK;
+}
+
+
+static yaffs_Object *yaffs_FindDeletedUnlinkedFile(yaffs_Device *dev)
+{
+ // todo find a file to delete
+ struct list_head *i;
+ yaffs_Object *l;
+
+
+ // To the free chunks add the chunks that are in the deleted unlinked files.
+ list_for_each(i,&dev->unlinkedDir->variant.directoryVariant.children)
+ {
+ l = list_entry(i, yaffs_Object,siblings);
+ if(l->deleted)
+ {
+ return l;
+ }
+ }
+ return NULL;
+}
+
+static void yaffs_DoUnlinkedFileDeletion(yaffs_Device *dev)
+{
+ // This does background deletion on unlinked files.. only deleted ones.
+ // If we don't have a file we're working on then find one
+ if(!dev->unlinkedDeletion && dev->nDeletedFiles > 0)
+ {
+ dev->unlinkedDeletion = yaffs_FindDeletedUnlinkedFile(dev);
+ }
+
+ // OK, we're working on a file...
+ if(dev->unlinkedDeletion)
+ {
+ yaffs_Object *obj = dev->unlinkedDeletion;
+ int delresult;
+ int limit; // Number of chunks to delete in a file.
+ // NB this can be exceeded, but not by much.
+
+ limit = 5;
+#if 0
+ if(dev->nErasedBlocks <= (YAFFS_RESERVED_BLOCKS + YAFFS_GARBAGE_COLLECT_LOW_WATER))
+ {
+ limit = 50; // Doing GC soon, so dig deeper
+ }
+ else
+ {
+ limit = 5;
+ }
+#endif
+
+ delresult = yaffs_DeleteWorker(obj, obj->variant.fileVariant.top, obj->variant.fileVariant.topLevel, 0,&limit);
+
+ if(obj->nDataChunks == 0)
+ {
+ // Done all the deleting of data chunks.
+ // Now dump the header and clean up
+ yaffs_FreeTnode(dev,obj->variant.fileVariant.top);
+ yaffs_DoGenericObjectDeletion(obj);
+ dev->nDeletedFiles--;
+ dev->nUnlinkedFiles--;
+ dev->nBackgroundDeletions++;
+ dev->unlinkedDeletion = NULL;
+ }
+ }
+}
+
+
+
+static int yaffs_CheckGarbageCollection(yaffs_Device *dev)
+{
+ int block;
+
+ yaffs_DoUnlinkedFileDeletion(dev);
+
+ if(dev->nErasedBlocks <= (YAFFS_RESERVED_BLOCKS + YAFFS_GARBAGE_COLLECT_LOW_WATER))
+ {
+ dev->garbageCollectionRequired = 1;
+ }
+
+ if(dev->garbageCollectionRequired)
+ {
+ dev->garbageCollections++;
+ dev->garbageCollectionRequired = 0;
+ if(dev->blockSelectedForGC >= 0)
+ {
+ block = dev->blockSelectedForGC;
+ }
+ else
+ {
+ block = yaffs_FindDirtiestBlock(dev);
+ }
+
+ if(block >= 0)
+ {
+ return yaffs_GarbageCollectBlock(dev,block);
+ }
+ else
+ {
+ return YAFFS_FAIL;
+ }
+ }
+
+ return YAFFS_OK;
+}
+
+
+//////////////////////////// TAGS ///////////////////////////////////////
+
+static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr)
+{
+ yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr;
+
+ yaffs_CalcTagsECC(tagsPtr);
+
+ sparePtr->tagByte0 = tu->asBytes[0];
+ sparePtr->tagByte1 = tu->asBytes[1];
+ sparePtr->tagByte2 = tu->asBytes[2];
+ sparePtr->tagByte3 = tu->asBytes[3];
+ sparePtr->tagByte4 = tu->asBytes[4];
+ sparePtr->tagByte5 = tu->asBytes[5];
+ sparePtr->tagByte6 = tu->asBytes[6];
+ sparePtr->tagByte7 = tu->asBytes[7];
+}
+
+static void yaffs_GetTagsFromSpare(yaffs_Device *dev, yaffs_Spare *sparePtr,yaffs_Tags *tagsPtr)
+{
+ yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr;
+ int result;
+
+ tu->asBytes[0]= sparePtr->tagByte0;
+ tu->asBytes[1]= sparePtr->tagByte1;
+ tu->asBytes[2]= sparePtr->tagByte2;
+ tu->asBytes[3]= sparePtr->tagByte3;
+ tu->asBytes[4]= sparePtr->tagByte4;
+ tu->asBytes[5]= sparePtr->tagByte5;
+ tu->asBytes[6]= sparePtr->tagByte6;
+ tu->asBytes[7]= sparePtr->tagByte7;
+
+ result = yaffs_CheckECCOnTags(tagsPtr);
+ if(result> 0)
+ {
+ dev->tagsEccFixed++;
+ }
+ else if(result <0)
+ {
+ dev->tagsEccUnfixed++;
+ }
+}
+
+static void yaffs_SpareInitialise(yaffs_Spare *spare)
+{
+ memset(spare,0xFF,sizeof(yaffs_Spare));
+}
+
+static int yaffs_ReadChunkTagsFromNAND(yaffs_Device *dev,int chunkInNAND, yaffs_Tags *tags, int *chunkDeleted)
+{
+ if(tags)
+ {
+ yaffs_Spare spare;
+ if(yaffs_ReadChunkFromNAND(dev,chunkInNAND,NULL,&spare,1) == YAFFS_OK)
+ {
+ *chunkDeleted = (yaffs_CountBits(spare.pageStatus) < 7) ? 1 : 0;
+ yaffs_GetTagsFromSpare(dev,&spare,tags);
+ return YAFFS_OK;
+ }
+ else
+ {
+ return YAFFS_FAIL;
+ }
+ }
+
+ return YAFFS_OK;
+}
+
+#if 0
+static int yaffs_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND, const __u8 *buffer, yaffs_Tags *tags)
+{
+ // NB There must be tags, data is optional
+ // If there is data, then an ECC is calculated on it.
+
+ yaffs_Spare spare;
+
+ if(!tags)
+ {
+ return YAFFS_FAIL;
+ }
+
+ yaffs_SpareInitialise(&spare);
+
+#ifndef CONFIG_YAFFS_USE_NANDECC
+ if(buffer)
+ {
+ yaffs_CalcECC(buffer,&spare);
+ }
+#endif
+
+ yaffs_LoadTagsIntoSpare(&spare,tags);
+
+ return yaffs_WriteChunkToNAND(dev,chunkInNAND,buffer,&spare);
+
+}
+#endif
+
+
+static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev, const __u8 *buffer, yaffs_Tags *tags, int useReserve)
+{
+ // NB There must be tags, data is optional
+ // If there is data, then an ECC is calculated on it.
+
+ yaffs_Spare spare;
+
+ if(!tags)
+ {
+ return YAFFS_FAIL;
+ }
+
+ yaffs_SpareInitialise(&spare);
+
+#ifndef CONFIG_YAFFS_USE_NANDECC
+
+ if(buffer)
+ {
+ yaffs_CalcECC(buffer,&spare);
+ }
+#endif
+
+ yaffs_LoadTagsIntoSpare(&spare,tags);
+
+ return yaffs_WriteNewChunkToNAND(dev,buffer,&spare,useReserve);
+
+}
+
+static int yaffs_TagsMatch(const yaffs_Tags *tags, int objectId, int chunkInObject, int chunkDeleted)
+{
+ return ( tags->chunkId == chunkInObject &&
+ tags->objectId == objectId &&
+ !chunkDeleted) ? 1 : 0;
+
+}
+
+
+
+int yaffs_FindChunkInFile(yaffs_Object *in,int chunkInInode,yaffs_Tags *tags)
+{
+ //Get the Tnode, then get the level 0 offset chunk offset
+ yaffs_Tnode *tn;
+ int theChunk = -1;
+ yaffs_Tags localTags;
+ int i;
+ int found = 0;
+ int chunkDeleted;
+
+ yaffs_Device *dev = in->myDev;
+
+
+ if(!tags)
+ {
+ // Passed a NULL, so use our own tags space
+ tags = &localTags;
+ }
+
+ tn = yaffs_FindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode);
+
+ if(tn)
+ {
+ theChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->chunkGroupBits;
+
+ // Now we need to do the shifting etc and search for it
+ for(i = 0,found = 0; theChunk && i < dev->chunkGroupSize && !found; i++)
+ {
+ yaffs_ReadChunkTagsFromNAND(dev,theChunk,tags,&chunkDeleted);
+ if(yaffs_TagsMatch(tags,in->objectId,chunkInInode,chunkDeleted))
+ {
+ // found it;
+ found = 1;
+ }
+ else
+ {
+ theChunk++;
+ }
+ }
+ }
+ return found ? theChunk : -1;
+}
+
+int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in,int chunkInInode,yaffs_Tags *tags)
+{
+ //Get the Tnode, then get the level 0 offset chunk offset
+ yaffs_Tnode *tn;
+ int theChunk = -1;
+ yaffs_Tags localTags;
+ int i;
+ int found = 0;
+ yaffs_Device *dev = in->myDev;
+ int chunkDeleted;
+
+ if(!tags)
+ {
+ // Passed a NULL, so use our own tags space
+ tags = &localTags;
+ }
+
+ tn = yaffs_FindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode);
+
+ if(tn)
+ {
+
+ theChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->chunkGroupBits;
+
+ // Now we need to do the shifting etc and search for it
+ for(i = 0,found = 0; theChunk && i < dev->chunkGroupSize && !found; i++)
+ {
+ yaffs_ReadChunkTagsFromNAND(dev,theChunk,tags,&chunkDeleted);
+ if(yaffs_TagsMatch(tags,in->objectId,chunkInInode,chunkDeleted))
+ {
+ // found it;
+ found = 1;
+ }
+ else
+ {
+ theChunk++;
+ }
+ }
+
+ // Delete the entry in the filestructure
+ if(found)
+ {
+ tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = 0;
+ }
+ }
+ else
+ {
+ //T(("No level 0 found for %d\n", chunkInInode));
+ }
+
+ if(!found)
+ {
+ //T(("Could not find %d to delete\n",chunkInInode));
+ }
+ return found ? theChunk : -1;
+}
+
+
+#ifdef YAFFS_PARANOID
+
+static int yaffs_CheckFileSanity(yaffs_Object *in)
+{
+ int chunk;
+ int nChunks;
+ int fSize;
+ int failed = 0;
+ int objId;
+ yaffs_Tnode *tn;
+ yaffs_Tags localTags;
+ yaffs_Tags *tags = &localTags;
+ int theChunk;
+ int chunkDeleted;
+
+
+ if(in->variantType != YAFFS_OBJECT_TYPE_FILE)
+ {
+ //T(("Object not a file\n"));
+ return YAFFS_FAIL;
+ }
+
+ objId = in->objectId;
+ fSize = in->variant.fileVariant.fileSize;
+ nChunks = (fSize + YAFFS_BYTES_PER_CHUNK -1)/YAFFS_BYTES_PER_CHUNK;
+
+ for(chunk = 1; chunk <= nChunks; chunk++)
+ {
+ tn = yaffs_FindLevel0Tnode(in->myDev,&in->variant.fileVariant, chunk);
+
+ if(tn)
+ {
+
+ theChunk = tn->level0[chunk & YAFFS_TNODES_LEVEL0_MASK] << in->myDev->chunkGroupBits;
+
+
+ yaffs_ReadChunkTagsFromNAND(in->myDev,theChunk,tags,&chunkDeleted);
+ if(yaffs_TagsMatch(tags,in->objectId,chunk,chunkDeleted))
+ {
+ // found it;
+
+ }
+ else
+ {
+ //T(("File problem file [%d,%d] NAND %d tags[%d,%d]\n",
+ // objId,chunk,theChunk,tags->chunkId,tags->objectId);
+
+ failed = 1;
+
+ }
+
+ }
+ else
+ {
+ //T(("No level 0 found for %d\n", chunk));
+ }
+ }
+
+ return failed ? YAFFS_FAIL : YAFFS_OK;
+}
+
+#endif
+
+static int yaffs_PutChunkIntoFile(yaffs_Object *in,int chunkInInode, int chunkInNAND, int inScan)
+{
+ yaffs_Tnode *tn;
+ yaffs_Device *dev = in->myDev;
+ int existingChunk;
+ yaffs_Tags existingTags;
+ yaffs_Tags newTags;
+ unsigned existingSerial, newSerial;
+
+ int newChunkDeleted;
+
+
+ tn = yaffs_AddOrFindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode);
+ if(!tn)
+ {
+ return YAFFS_FAIL;
+ }
+
+ existingChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK];
+
+ if(inScan)
+ {
+ // If we're scanning then we need to test for duplicates
+ // NB This does not need to be efficient since it should only ever
+ // happen when the power fails during a write, then only one
+ // chunk should ever be affected.
+
+
+ if(existingChunk != 0)
+ {
+ // NB Right now existing chunk will not be real chunkId if the device >= 32MB
+ // thus we have to do a FindChunkInFile to get the real chunk id.
+ //
+ // We have a duplicate now we need to decide which one to use
+ // To do this we get both sets of tags and compare serial numbers.
+ yaffs_ReadChunkTagsFromNAND(dev,chunkInNAND, &newTags,&newChunkDeleted);
+
+
+ // Do a proper find
+ existingChunk = yaffs_FindChunkInFile(in,chunkInInode, &existingTags);
+
+ if(existingChunk <=0)
+ {
+ //Hoosterman - how did this happen?
+
+ T(YAFFS_TRACE_ERROR, (TSTR("yaffs tradgedy: existing chunk < 0 in scan" TENDSTR)));
+
+ }
+
+
+ // NB The deleted flags should be false, otherwise the chunks will
+ // not be loaded during a scan
+
+ newSerial = newTags.serialNumber;
+ existingSerial = existingTags.serialNumber;
+
+ if( existingChunk <= 0 ||
+ ((existingSerial+1) & 3) == newSerial)
+ {
+ // Use new
+ // Delete the old one and drop through to update the tnode
+ yaffs_DeleteChunk(dev,existingChunk);
+ }
+ else
+ {
+ // Use existing.
+ // Delete the new one and return early so that the tnode isn't changed
+ yaffs_DeleteChunk(dev,chunkInNAND);
+ return YAFFS_OK;
+ }
+ }
+
+ }
+
+ if(existingChunk == 0)
+ {
+ in->nDataChunks++;
+ }
+
+ tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = (chunkInNAND >> dev->chunkGroupBits);
+
+ return YAFFS_OK;
+}
+
+
+
+int yaffs_ReadChunkDataFromObject(yaffs_Object *in,int chunkInInode, __u8 *buffer)
+{
+ int chunkInNAND = yaffs_FindChunkInFile(in,chunkInInode,NULL);
+
+ if(chunkInNAND >= 0)
+ {
+ return yaffs_ReadChunkFromNAND(in->myDev,chunkInNAND,buffer,NULL,1);
+ }
+ else
+ {
+ return 0;
+ }
+
+}
+
+
+static void yaffs_DeleteChunk(yaffs_Device *dev,int chunkId)
+{
+ int block;
+ int page;
+ yaffs_Spare spare;
+ yaffs_BlockInfo *bi;
+
+ if(chunkId <= 0) return;
+
+ block = chunkId / YAFFS_CHUNKS_PER_BLOCK;
+ page = chunkId % YAFFS_CHUNKS_PER_BLOCK;
+ yaffs_SpareInitialise(&spare);
+
+ spare.pageStatus = 0; // To mark it as deleted.
+
+
+ yaffs_WriteChunkToNAND(dev,chunkId,NULL,&spare);
+ yaffs_HandleUpdateChunk(dev,chunkId,&spare);
+ bi = yaffs_GetBlockInfo(dev,block);
+
+
+ // Pull out of the management area.
+ // If the whole block became dirty, this will kick off an erasure.
+ if( bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
+ bi->blockState == YAFFS_BLOCK_STATE_FULL)
+ {
+ dev->nFreeChunks++;
+
+ bi->pageBits &= ~(1 << page);
+ bi->pagesInUse--;
+
+ if(bi->pagesInUse == 0 &&
+ bi->blockState == YAFFS_BLOCK_STATE_FULL)
+ {
+ yaffs_BlockBecameDirty(dev,block);
+ }
+
+ }
+ else
+ {
+ // T(("Bad news deleting chunk %d\n",chunkId));
+ }
+
+}
+
+
+
+
+int yaffs_WriteChunkDataToObject(yaffs_Object *in,int chunkInInode, const __u8 *buffer,int nBytes,int useReserve)
+{
+ // Find old chunk Need to do this to get serial number
+ // Write new one and patch into tree.
+ // Invalidate old tags.
+
+ int prevChunkId;
+ yaffs_Tags prevTags;
+
+ int newChunkId;
+ yaffs_Tags newTags;
+
+ yaffs_Device *dev = in->myDev;
+
+ yaffs_CheckGarbageCollection(dev);
+
+ // Get the previous chunk at this location in the file if it exists
+ prevChunkId = yaffs_FindChunkInFile(in,chunkInInode,&prevTags);
+
+ // Set up new tags
+ newTags.chunkId = chunkInInode;
+ newTags.objectId = in->objectId;
+ newTags.serialNumber = (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;
+ newTags.byteCount = nBytes;
+ newTags.unusedStuff = 0xFFFFFFFF;
+
+ yaffs_CalcTagsECC(&newTags);
+
+ newChunkId = yaffs_WriteNewChunkWithTagsToNAND(dev,buffer,&newTags,useReserve);
+ if(newChunkId >= 0)
+ {
+ yaffs_PutChunkIntoFile(in,chunkInInode,newChunkId,0);
+
+
+ if(prevChunkId >= 0)
+ {
+ yaffs_DeleteChunk(dev,prevChunkId);
+
+ }
+
+ yaffs_CheckFileSanity(in);
+ }
+ return newChunkId;
+
+
+
+
+
+}
+
+
+// UpdateObjectHeader updates the header on NAND for an object.
+// If name is not NULL, then that new name is used.
+//
+int yaffs_UpdateObjectHeader(yaffs_Object *in,const char *name, int force)
+{
+
+ yaffs_Device *dev = in->myDev;
+
+ int prevChunkId;
+
+ int newChunkId;
+ yaffs_Tags newTags;
+ __u8 bufferNew[YAFFS_BYTES_PER_CHUNK];
+ __u8 bufferOld[YAFFS_BYTES_PER_CHUNK];
+
+ yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)bufferNew;
+ yaffs_ObjectHeader *ohOld = (yaffs_ObjectHeader *)bufferOld;
+
+
+ if(!in->fake || force)
+ {
+
+ yaffs_CheckGarbageCollection(dev);
+
+ memset(bufferNew,0xFF,YAFFS_BYTES_PER_CHUNK);
+
+ prevChunkId = in->chunkId;
+
+ if(prevChunkId >= 0)
+ {
+ yaffs_ReadChunkFromNAND(dev,prevChunkId,bufferOld,NULL,1);
+ }
+
+ // Header data
+ oh->type = in->variantType;
+
+ oh->st_mode = in->st_mode;
+
+#ifdef CONFIG_YAFFS_WINCE
+ oh->win_atime[0] = in->win_atime[0];
+ oh->win_ctime[0] = in->win_ctime[0];
+ oh->win_mtime[0] = in->win_mtime[0];
+ oh->win_atime[1] = in->win_atime[1];
+ oh->win_ctime[1] = in->win_ctime[1];
+ oh->win_mtime[1] = in->win_mtime[1];
+#else
+ oh->st_uid = in->st_uid;
+ oh->st_gid = in->st_gid;
+ oh->st_atime = in->st_atime;
+ oh->st_mtime = in->st_mtime;
+ oh->st_ctime = in->st_ctime;
+ oh->st_rdev = in->st_rdev;
+#endif
+ if(in->parent)
+ {
+ oh->parentObjectId = in->parent->objectId;
+ }
+ else
+ {
+ oh->parentObjectId = 0;
+ }
+
+ //oh->sum = in->sum;
+ if(name && *name)
+ {
+ memset(oh->name,0,YAFFS_MAX_NAME_LENGTH + 1);
+ strncpy(oh->name,name,YAFFS_MAX_NAME_LENGTH);
+ }
+ else if(prevChunkId)
+ {
+ memcpy(oh->name, ohOld->name,YAFFS_MAX_NAME_LENGTH + 1);
+ }
+ else
+ {
+ memset(oh->name,0,YAFFS_MAX_NAME_LENGTH + 1);
+ }
+
+ switch(in->variantType)
+ {
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ // Should not happen
+ break;
+ case YAFFS_OBJECT_TYPE_FILE:
+ oh->fileSize = in->variant.fileVariant.fileSize;
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ oh->equivalentObjectId = in->variant.hardLinkVariant.equivalentObjectId;
+ break;
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ // Do nothing
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ // Do nothing
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ strncpy(oh->alias,in->variant.symLinkVariant.alias,YAFFS_MAX_ALIAS_LENGTH);
+ oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
+ break;
+ }
+
+ // Tags
+ in->serial++;
+ newTags.chunkId = 0;
+ newTags.objectId = in->objectId;
+ newTags.serialNumber = in->serial;
+ newTags.byteCount = 0xFFFFFFFF;
+ newTags.unusedStuff = 0xFFFFFFFF;
+
+ yaffs_CalcTagsECC(&newTags);
+
+
+ // Create new chunk in NAND
+ newChunkId = yaffs_WriteNewChunkWithTagsToNAND(dev,bufferNew,&newTags,1);
+
+ if(newChunkId >= 0)
+ {
+
+ in->chunkId = newChunkId;
+
+ if(prevChunkId >= 0)
+ {
+ yaffs_DeleteChunk(dev,prevChunkId);
+ }
+
+ in->dirty = 0;
+ }
+
+ return newChunkId;
+
+ }
+ return 0;
+}
+
+
+/////////////////////// Short Operations Cache ////////////////////////////////
+// In many siturations where there is no high level buffering (eg WinCE) a lot of
+// reads might be short sequential reads, and a lot of writes may be short
+// sequential writes. eg. scanning/writing a jpeg file.
+// In these cases, a short read/write cache can provide a huge perfomance benefit
+// with dumb-as-a-rock code.
+// There are a limited number (~10) of cache chunks per device so that we don't
+// need a very intelligent search.
+
+
+#ifdef CONFIG_YAFFS_SHORT_OP_CACHE
+
+
+static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
+{
+ yaffs_Device *dev = obj->myDev;
+ int lowest;
+ int i;
+ yaffs_ChunkCache *cache;
+ int chunkWritten;
+ int nBytes;
+
+ do{
+ cache = NULL;
+
+ // Find the dirty cache for this object with the lowest chunk id.
+ for(i = 0; i < YAFFS_N_CACHE_CHUNKS; i++)
+ {
+ if(dev->srCache[i].object == obj &&
+ dev->srCache[i].dirty)
+ {
+ if(!cache || dev->srCache[i].chunkId < lowest)
+ {
+ cache = &dev->srCache[i];
+ lowest = cache->chunkId;
+ }
+ }
+ }
+
+ if(cache)
+ {
+ //Write it out
+
+ nBytes = cache->object->variant.fileVariant.fileSize - ((cache->chunkId -1) * YAFFS_BYTES_PER_CHUNK);
+
+ if(nBytes > YAFFS_BYTES_PER_CHUNK)
+ {
+ nBytes= YAFFS_BYTES_PER_CHUNK;
+ }
+
+ chunkWritten = yaffs_WriteChunkDataToObject(cache->object,
+ cache->chunkId,
+ cache->data,
+ nBytes,1);
+
+ cache->dirty = 0;
+ }
+
+ } while(cache && chunkWritten > 0);
+
+ if(cache)
+ {
+ //Hoosterman, disk full while writing cache out.
+ T(YAFFS_TRACE_ERROR, (TSTR("yaffs tradgedy: no space during caceh write" TENDSTR)));
+
+ }
+
+}
+
+
+// Grab us a chunk for use.
+// First look for an empty one.
+// Then look for the least recently used non-dirty one.
+// Then look for the least recently used dirty one...., flush and look again.
+static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)
+{
+ int i;
+ int usage;
+ int theOne;
+
+ for(i = 0; i < YAFFS_N_CACHE_CHUNKS; i++)
+ {
+ if(!dev->srCache[i].object)
+ {
+ //T(("Grabbing empty %d\n",i));
+
+ return &dev->srCache[i];
+ }
+ }
+
+ theOne = -1;
+ usage = 0; // just to stop the compiler grizzling
+
+ for(i = 0; i < YAFFS_N_CACHE_CHUNKS; i++)
+ {
+ if(!dev->srCache[i].dirty &&
+ ((dev->srCache[i].lastUse < usage && theOne >= 0)||
+ theOne < 0))
+ {
+ usage = dev->srCache[i].lastUse;
+ theOne = i;
+ }
+ }
+
+ //T(("Grabbing non-empty %d\n",theOne));
+ return theOne >= 0 ? &dev->srCache[theOne] : NULL;
+
+}
+
+
+static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
+{
+ yaffs_ChunkCache *cache;
+ yaffs_Object *theObj;
+ int usage;
+ int i;
+
+ // Try find a non-dirty one...
+
+ cache = yaffs_GrabChunkCacheWorker(dev);
+
+ if(!cache)
+ {
+ // They were all dirty, find the last recently used object and flush
+ // its cache, then find again.
+ // NB what's here is not very accurate, we actually flush the object
+ // the last recently used page.
+
+ theObj = dev->srCache[0].object;
+ usage = dev->srCache[0].lastUse;
+
+ for(i = 1; i < YAFFS_N_CACHE_CHUNKS; i++)
+ {
+ if( dev->srCache[i].object &&
+ dev->srCache[i].lastUse < usage)
+ {
+ usage = dev->srCache[i].lastUse;
+ theObj = dev->srCache[i].object;
+ }
+ }
+
+ yaffs_FlushFilesChunkCache(theObj);
+
+ // Try again
+ cache = yaffs_GrabChunkCacheWorker(dev);
+ }
+
+ return cache;
+
+}
+
+
+// Find a cached chunk
+static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj, int chunkId)
+{
+ yaffs_Device *dev = obj->myDev;
+ int i;
+
+ for(i = 0; i < YAFFS_N_CACHE_CHUNKS; i++)
+ {
+ if(dev->srCache[i].object == obj &&
+ dev->srCache[i].chunkId == chunkId)
+ {
+ dev->cacheHits++;
+
+ return &dev->srCache[i];
+ }
+ }
+
+ return NULL;
+}
+
+// Mark the chunk for the least recently used algorithym
+static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache, int isAWrite)
+{
+ if( dev->srLastUse < 0 ||
+ dev->srLastUse > 100000000)
+ {
+ // Reset the cache usages
+ int i;
+ for(i = 1; i < YAFFS_N_CACHE_CHUNKS; i++)
+ {
+ dev->srCache[i].lastUse = 0;
+ }
+ dev->srLastUse = 0;
+ }
+
+ dev->srLastUse++;
+
+ cache->lastUse = dev->srLastUse;
+
+ if(isAWrite)
+ {
+ cache->dirty = 1;
+ }
+}
+
+// Invalidate a single cache page.
+// Do this when a whole page gets written,
+// ie the short cache for this page is no longer valid.
+static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)
+{
+ yaffs_ChunkCache *cache = yaffs_FindChunkCache(object,chunkId);
+
+ if(cache)
+ {
+ cache->object = NULL;
+ }
+}
+
+
+// Invalidate all the cache pages associated with this object
+// Do this whenever ther file is deleted or resized.
+static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
+{
+ int i;
+ yaffs_Device *dev = in->myDev;
+
+ // Now invalidate it.
+ for(i = 0; i < YAFFS_N_CACHE_CHUNKS; i++)
+ {
+ if(dev->srCache[i].object == in)
+ {
+ dev->srCache[i].object = NULL;
+ }
+ }
+}
+
+
+#else
+// Stubs for disabling short op caching
+
+static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
+{}
+
+static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
+{
+ return NULL;
+}
+
+
+static yaffs_ChunkCache *yaffs_FindChunkCache(yaffs_Device *dev, int objectId, int chunkId)
+{
+ return NULL;
+}
+
+static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache)
+{
+}
+
+static void yaffs_InvalidateChunkCache(yaffs_Object *obj, int chunkId)
+{
+}
+
+static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
+{
+}
+
+
+
+#endif
+
+
+
+///////////////////////// File read/write ///////////////////////////////
+// Read and write have very similar structures.
+// In general the read/write has three parts to it
+// * An incomplete chunk to start with (if the read/write is not chunk-aligned)
+// * Some complete chunks
+// * An incomplete chunk to end off with
+//
+// Curve-balls: the first chunk might also be the last chunk.
+
+int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 * buffer, __u32 offset, int nBytes)
+{
+
+
+ int chunk;
+ int start;
+ int nToCopy;
+ int n = nBytes;
+ int nDone = 0;
+
+ yaffs_Device *dev;
+
+ dev = in->myDev;
+
+ while(n > 0)
+ {
+ chunk = offset / YAFFS_BYTES_PER_CHUNK + 1; // The first chunk is 1
+ start = offset % YAFFS_BYTES_PER_CHUNK;
+
+ // OK now check for the curveball where the start and end are in
+ // the same chunk.
+ if( (start + n) < YAFFS_BYTES_PER_CHUNK)
+ {
+ nToCopy = n;
+ }
+ else
+ {
+ nToCopy = YAFFS_BYTES_PER_CHUNK - start;
+ }
+
+ if(nToCopy != YAFFS_BYTES_PER_CHUNK)
+ {
+ // An incomplete start or end chunk (or maybe both start and end chunk)
+#ifdef CONFIG_YAFFS_SHORT_OP_CACHE
+ yaffs_ChunkCache *cache;
+ // If we can't find the data in the cache, then load it up.
+ cache = yaffs_FindChunkCache(in,chunk);
+ if(!cache)
+ {
+ cache = yaffs_GrabChunkCache(in->myDev);
+ cache->object = in;
+ cache->chunkId = chunk;
+ cache->dirty = 0;
+ yaffs_ReadChunkDataFromObject(in,chunk,cache->data);
+ }
+
+ yaffs_UseChunkCache(dev,cache,0);
+
+ memcpy(buffer,&cache->data[start],nToCopy);
+#else
+ // Read into the local buffer then copy...
+ yaffs_ReadChunkDataFromObject(in,chunk,dev->localBuffer);
+ memcpy(buffer,&dev->localBuffer[start],nToCopy);
+#endif
+ }
+ else
+ {
+#ifdef CONFIG_YAFFS_WINCE
+
+ // Under WinCE can't do direct transfer. Need to use a local buffer.
+ // This is because we otherwise screw up WinCE's memory mapper
+ yaffs_ReadChunkDataFromObject(in,chunk,dev->localBuffer);
+ memcpy(buffer,dev->localBuffer,YAFFS_BYTES_PER_CHUNK);
+#else
+ // A full chunk. Read directly into the supplied buffer.
+ yaffs_ReadChunkDataFromObject(in,chunk,buffer);
+#endif
+ }
+
+ n -= nToCopy;
+ offset += nToCopy;
+ buffer += nToCopy;
+ nDone += nToCopy;
+
+ }
+
+ return nDone;
+}
+
+
+
+int yaffs_WriteDataToFile(yaffs_Object *in,const __u8 * buffer, __u32 offset, int nBytes)
+{
+
+ int chunk;
+ int start;
+ int nToCopy;
+ int n = nBytes;
+ int nDone = 0;
+ int nToWriteBack;
+ int startOfWrite = offset;
+ int chunkWritten = 0;
+ int nBytesRead;
+
+ yaffs_Device *dev;
+
+ dev = in->myDev;
+
+
+ while(n > 0 && chunkWritten >= 0)
+ {
+ chunk = offset / YAFFS_BYTES_PER_CHUNK + 1;
+ start = offset % YAFFS_BYTES_PER_CHUNK;
+
+
+ // OK now check for the curveball where the start and end are in
+ // the same chunk.
+
+ if( (start + n) < YAFFS_BYTES_PER_CHUNK)
+ {
+ nToCopy = n;
+
+ // Now folks, to calculate how many bytes to write back....
+ // If we're overwriting and not writing to then end of file then
+ // we need to write back as much as was there before.
+
+ nBytesRead = in->variant.fileVariant.fileSize - ((chunk -1) * YAFFS_BYTES_PER_CHUNK);
+
+ if(nBytesRead > YAFFS_BYTES_PER_CHUNK)
+ {
+ nBytesRead = YAFFS_BYTES_PER_CHUNK;
+ }
+
+ nToWriteBack = (nBytesRead > (start + n)) ? nBytesRead : (start +n);
+
+ }
+ else
+ {
+ nToCopy = YAFFS_BYTES_PER_CHUNK - start;
+ nToWriteBack = YAFFS_BYTES_PER_CHUNK;
+ }
+
+ if(nToCopy != YAFFS_BYTES_PER_CHUNK)
+ {
+ // An incomplete start or end chunk (or maybe both start and end chunk)
+#ifdef CONFIG_YAFFS_SHORT_OP_CACHE
+ yaffs_ChunkCache *cache;
+ // If we can't find the data in the cache, then load it up.
+ cache = yaffs_FindChunkCache(in,chunk);
+ if(!cache && yaffs_CheckSpaceForChunkCache(in->myDev))
+ {
+ cache = yaffs_GrabChunkCache(in->myDev);
+ cache->object = in;
+ cache->chunkId = chunk;
+ cache->dirty = 0;
+ yaffs_ReadChunkDataFromObject(in,chunk,cache->data);
+ }
+
+ if(cache)
+ {
+ yaffs_UseChunkCache(dev,cache,1);
+ memcpy(&cache->data[start],buffer,nToCopy);
+ }
+ else
+ {
+ chunkWritten = -1; // fail the write
+ }
+#else
+
+
+ // An incomplete start or end chunk (or maybe both start and end chunk)
+ // Read into the local buffer then copy, then copy over and write back.
+
+ yaffs_ReadChunkDataFromObject(in,chunk,dev->localBuffer);
+
+ memcpy(&dev->localBuffer[start],buffer,nToCopy);
+
+ chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,dev->localBuffer,nToWriteBack,0);
+
+ //T(("Write with readback to chunk %d %d start %d copied %d wrote back %d\n",chunk,chunkWritten,start, nToCopy, nToWriteBack));
+#endif
+
+ }
+ else
+ {
+
+#ifdef CONFIG_YAFFS_WINCE
+ // Under WinCE can't do direct transfer. Need to use a local buffer.
+ // This is because we otherwise screw up WinCE's memory mapper
+ memcpy(dev->localBuffer,buffer,YAFFS_BYTES_PER_CHUNK);
+ chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,dev->localBuffer,YAFFS_BYTES_PER_CHUNK,0);
+#else
+ // A full chunk. Write directly from the supplied buffer.
+ chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,buffer,YAFFS_BYTES_PER_CHUNK,0);
+#endif
+ // Since we've overwritten the cached data, we better invalidate it.
+ yaffs_InvalidateChunkCache(in,chunk);
+ //T(("Write to chunk %d %d\n",chunk,chunkWritten));
+ }
+
+ if(chunkWritten >= 0)
+ {
+ n -= nToCopy;
+ offset += nToCopy;
+ buffer += nToCopy;
+ nDone += nToCopy;
+ }
+
+ }
+
+ // Update file object
+
+ if((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
+ {
+ in->variant.fileVariant.fileSize = (startOfWrite + nDone);
+ }
+
+ in->dirty = 1;
+
+ return nDone;
+}
+
+
+int yaffs_ResizeFile(yaffs_Object *in, int newSize)
+{
+ int i;
+ int chunkId;
+ int oldFileSize = in->variant.fileVariant.fileSize;
+ int sizeOfPartialChunk = newSize % YAFFS_BYTES_PER_CHUNK;
+
+ yaffs_Device *dev = in->myDev;
+
+
+ yaffs_FlushFilesChunkCache(in);
+ yaffs_InvalidateWholeChunkCache(in);
+
+ if(in->variantType != YAFFS_OBJECT_TYPE_FILE)
+ {
+ return yaffs_GetFileSize(in);
+ }
+
+ if(newSize < oldFileSize)
+ {
+
+ int lastDel = 1 + (oldFileSize-1)/YAFFS_BYTES_PER_CHUNK;
+
+ int startDel = 1 + (newSize + YAFFS_BYTES_PER_CHUNK - 1)/
+ YAFFS_BYTES_PER_CHUNK;
+
+ // Delete backwards so that we don't end up with holes if
+ // power is lost part-way through the operation.
+ for(i = lastDel; i >= startDel; i--)
+ {
+ // NB this could be optimised somewhat,
+ // eg. could retrieve the tags and write them without
+ // using yaffs_DeleteChunk
+
+ chunkId = yaffs_FindAndDeleteChunkInFile(in,i,NULL);
+ if(chunkId <= 0 || chunkId >= (dev->endBlock * 32))
+ {
+ //T(("Found daft chunkId %d for %d\n",chunkId,i));
+ }
+ else
+ {
+ in->nDataChunks--;
+ yaffs_DeleteChunk(dev,chunkId);
+ }
+ }
+
+
+ if(sizeOfPartialChunk != 0)
+ {
+ int lastChunk = 1+ newSize/YAFFS_BYTES_PER_CHUNK;
+
+ // Got to read and rewrite the last chunk with its new size.
+ yaffs_ReadChunkDataFromObject(in,lastChunk,dev->localBuffer);
+
+ yaffs_WriteChunkDataToObject(in,lastChunk,dev->localBuffer,sizeOfPartialChunk,1);
+
+ }
+
+ in->variant.fileVariant.fileSize = newSize;
+
+ yaffs_PruneFileStructure(dev,&in->variant.fileVariant);
+
+ return newSize;
+
+ }
+ else
+ {
+ return oldFileSize;
+ }
+}
+
+
+loff_t yaffs_GetFileSize(yaffs_Object *obj)
+{
+ obj = yaffs_GetEquivalentObject(obj);
+
+ switch(obj->variantType)
+ {
+ case YAFFS_OBJECT_TYPE_FILE:
+ return obj->variant.fileVariant.fileSize;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ return strlen(obj->variant.symLinkVariant.alias);
+ default:
+ return 0;
+ }
+}
+
+
+
+// yaffs_FlushFile() updates the file's
+// objectId in NAND
+
+int yaffs_FlushFile(yaffs_Object *in)
+{
+ int retVal;
+ if(in->dirty)
+ {
+ //T(("flushing object header\n"));
+
+ yaffs_FlushFilesChunkCache(in);
+
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_WinFileTimeNow(in->win_mtime);
+#else
+ in->st_mtime = CURRENT_TIME;
+#endif
+
+ retVal = yaffs_UpdateObjectHeader(in,NULL,0);
+ }
+ else
+ {
+ retVal = YAFFS_OK;
+ }
+
+ return retVal;
+
+}
+
+
+static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
+{
+
+ // First off, invalidate the file's data in the cache, without flushing.
+ yaffs_InvalidateWholeChunkCache(in);
+
+ yaffs_RemoveObjectFromDirectory(in);
+ yaffs_DeleteChunk(in->myDev,in->chunkId);
+#ifdef __KERNEL__
+ if(in->myInode)
+ {
+ in->myInode->u.generic_ip = NULL;
+ in->myInode = 0;
+ }
+#endif
+ yaffs_FreeObject(in);
+ return YAFFS_OK;
+
+}
+
+// yaffs_DeleteFile deletes the whole file data
+// and the inode associated with the file.
+// It does not delete the links associated with the file.
+static int yaffs_UnlinkFile(yaffs_Object *in)
+{
+
+#ifdef CONFIG_YAFFS_DISABLE_BACKGROUND_DELETION
+ // Delete the file data & tnodes
+
+ yaffs_DeleteWorker(in, in->variant.fileVariant.top, in->variant.fileVariant.topLevel, 0,NULL);
+
+
+ yaffs_FreeTnode(in->myDev,in->variant.fileVariant.top);
+
+ return yaffs_DoGenericObjectDeletion(in);
+#else
+ int retVal;
+ int immediateDeletion=0;
+ retVal = yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,NULL,0);
+ if(retVal == YAFFS_OK)
+ {
+ //in->unlinked = 1;
+ //in->myDev->nUnlinkedFiles++;
+ //in->renameAllowed = 0;
+#ifdef __KERNEL__
+ if(in->myInode)
+ {
+ immediateDeletion = 1;
+
+ }
+#endif
+#ifdef CONFIG_YAFFS_WINCE
+ if(in->inUse <= 0)
+ {
+ immediateDeletion = 1;
+
+ }
+#endif
+
+ if(immediateDeletion)
+ {
+ T(YAFFS_TRACE_TRACING,(TSTR("yaffs: immediate deletion of file %d" TENDSTR),in->objectId));
+ in->deleted=1;
+ in->myDev->nDeletedFiles++;
+ }
+
+ }
+ return retVal;
+
+
+#endif
+}
+
+int yaffs_DeleteFile(yaffs_Object *in)
+{
+ int retVal = YAFFS_OK;
+ if(!in->unlinked)
+ {
+ retVal = yaffs_UnlinkFile(in);
+ }
+ if(retVal == YAFFS_OK &&
+ in->unlinked &&
+ !in->deleted)
+ {
+ in->deleted = 1;
+ in->myDev->nDeletedFiles++;
+ }
+ return in->deleted ? YAFFS_OK : YAFFS_FAIL;
+}
+
+static int yaffs_DeleteDirectory(yaffs_Object *in)
+{
+ //First check that the directory is empty.
+ if(list_empty(&in->variant.directoryVariant.children))
+ {
+ return yaffs_DoGenericObjectDeletion(in);
+ }
+
+ return YAFFS_FAIL;
+
+}
+
+static int yaffs_DeleteSymLink(yaffs_Object *in)
+{
+ YFREE(in->variant.symLinkVariant.alias);
+
+ return yaffs_DoGenericObjectDeletion(in);
+}
+
+static int yaffs_DeleteHardLink(yaffs_Object *in)
+{
+ // remove this hardlink from the list assocaited with the equivalent
+ // object
+ list_del(&in->hardLinks);
+ return yaffs_DoGenericObjectDeletion(in);
+}
+
+
+static int yaffs_UnlinkWorker(yaffs_Object *obj)
+{
+
+
+ if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
+ {
+ return yaffs_DeleteHardLink(obj);
+ }
+ else if(!list_empty(&obj->hardLinks))
+ {
+ // Curve ball: We're unlinking an object that has a hardlink.
+ //
+ // This problem arises because we are not strictly following
+ // The Linux link/inode model.
+ //
+ // We can't really delete the object.
+ // Instead, we do the following:
+ // - Select a hardlink.
+ // - Unhook it from the hard links
+ // - Unhook it from its parent directory (so that the rename can work)
+ // - Rename the object to the hardlink's name.
+ // - Delete the hardlink
+
+
+ yaffs_Object *hl;
+ int retVal;
+ char name[YAFFS_MAX_NAME_LENGTH+1];
+
+ hl = list_entry(obj->hardLinks.next,yaffs_Object,hardLinks);
+
+ list_del_init(&hl->hardLinks);
+ list_del_init(&hl->siblings);
+
+ yaffs_GetObjectName(hl,name,YAFFS_MAX_NAME_LENGTH+1);
+
+ retVal = yaffs_ChangeObjectName(obj, hl->parent, name,0);
+
+ if(retVal == YAFFS_OK)
+ {
+ retVal = yaffs_DoGenericObjectDeletion(hl);
+ }
+ return retVal;
+
+ }
+ else
+ {
+ switch(obj->variantType)
+ {
+ case YAFFS_OBJECT_TYPE_FILE:
+ return yaffs_UnlinkFile(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ return yaffs_DeleteDirectory(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ return yaffs_DeleteSymLink(obj);
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ default:
+ return YAFFS_FAIL;
+ }
+ }
+}
+
+int yaffs_Unlink(yaffs_Object *dir, const char *name)
+{
+ yaffs_Object *obj;
+
+ obj = yaffs_FindObjectByName(dir,name);
+
+ if(obj && obj->unlinkAllowed)
+ {
+ return yaffs_UnlinkWorker(obj);
+ }
+
+ return YAFFS_FAIL;
+
+}
+
+//////////////// Initialisation Scanning /////////////////
+
+
+
+// For now we use the SmartMedia check.
+// We look at the blockStatus byte in the first two chunks
+// These must be 0xFF to pass as OK.
+// todo: this function needs to be modifyable foir different NAND types
+// and different chunk sizes. Suggest make this into a per-device configurable
+// function.
+static int yaffs_IsBlockBad(yaffs_Device *dev, int blk)
+{
+ yaffs_Spare spare;
+
+ yaffs_ReadChunkFromNAND(dev,blk * YAFFS_CHUNKS_PER_BLOCK,NULL,&spare,1);
+#if 1
+ if(yaffs_CountBits(spare.blockStatus) < 7)
+ {
+ return 1;
+ }
+#else
+ if(spare.blockStatus != 0xFF)
+ {
+ return 1;
+ }
+#endif
+ yaffs_ReadChunkFromNAND(dev,blk * YAFFS_CHUNKS_PER_BLOCK + 1,NULL,&spare,1);
+
+#if 1
+ if(yaffs_CountBits(spare.blockStatus) < 7)
+ {
+ return 1;
+ }
+#else
+ if(spare.blockStatus != 0xFF)
+ {
+ return 1;
+ }
+#endif
+
+ return 0;
+
+}
+
+static int yaffs_Scan(yaffs_Device *dev)
+{
+ yaffs_Spare spare;
+ yaffs_Tags tags;
+ int blk;
+ int chunk;
+ int c;
+ int deleted;
+ yaffs_BlockState state;
+ yaffs_Object *hardList = NULL;
+ yaffs_Object *hl;
+ yaffs_BlockInfo *bi;
+
+
+ yaffs_ObjectHeader *oh;
+ yaffs_Object *in;
+ yaffs_Object *parent;
+
+ __u8 chunkData[YAFFS_BYTES_PER_CHUNK];
+
+
+ // Scan all the blocks...
+
+ for(blk = dev->startBlock; blk <= dev->endBlock; blk++)
+ {
+ deleted = 0;
+ bi = yaffs_GetBlockInfo(dev,blk);
+ bi->pageBits = 0;
+ bi->pagesInUse = 0;
+ state = YAFFS_BLOCK_STATE_SCANNING;
+
+
+ if(yaffs_IsBlockBad(dev,blk))
+ {
+ state = YAFFS_BLOCK_STATE_DEAD;
+ T(YAFFS_TRACE_BAD_BLOCKS,(TSTR("block %d is bad" TENDSTR),blk));
+ }
+
+ // Read each chunk in the block.
+
+ for(c = 0; c < YAFFS_CHUNKS_PER_BLOCK &&
+ state == YAFFS_BLOCK_STATE_SCANNING; c++)
+ {
+ // Read the spare area and decide what to do
+ chunk = blk * YAFFS_CHUNKS_PER_BLOCK + c;
+
+ yaffs_ReadChunkFromNAND(dev,chunk,NULL,&spare,1);
+
+
+ // This block looks ok, now what's in this chunk?
+ yaffs_GetTagsFromSpare(dev,&spare,&tags);
+
+ if(yaffs_CountBits(spare.pageStatus) < 6)
+ {
+ // A deleted chunk
+ deleted++;
+ dev->nFreeChunks ++;
+ //T((" %d %d deleted\n",blk,c));
+ }
+ else if(tags.objectId == YAFFS_UNUSED_OBJECT_ID)
+ {
+ // An unassigned chunk in the block
+ // This means that either the block is empty or
+ // this is the one being allocated from
+
+ if(c == 0)
+ {
+ // the block is unused
+ state = YAFFS_BLOCK_STATE_EMPTY;
+ dev->nErasedBlocks++;
+ }
+ else
+ {
+ // this is the block being allocated from
+ T(YAFFS_TRACE_SCAN,(TSTR(" Allocating from %d %d" TENDSTR),blk,c));
+ state = YAFFS_BLOCK_STATE_ALLOCATING;
+ dev->allocationBlock = blk;
+ dev->allocationPage = c;
+ }
+
+ dev->nFreeChunks += (YAFFS_CHUNKS_PER_BLOCK - c);
+ }
+ else if(tags.chunkId > 0)
+ {
+ int endpos;
+ // A data chunk.
+ bi->pageBits |= (1 << c);
+ bi->pagesInUse++;
+
+ in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,YAFFS_OBJECT_TYPE_FILE);
+ // PutChunkIntoFIle checks for a clash (two data chunks with
+ // the same chunkId).
+ yaffs_PutChunkIntoFile(in,tags.chunkId,chunk,1);
+ endpos = (tags.chunkId - 1)* YAFFS_BYTES_PER_CHUNK + tags.byteCount;
+ if(in->variant.fileVariant.scannedFileSize <endpos)
+ {
+ in->variant.fileVariant.scannedFileSize = endpos;
+#ifndef CONFIG_YAFFS_USE_HEADER_FILE_SIZE
+ in->variant.fileVariant.fileSize =
+ in->variant.fileVariant.scannedFileSize;
+#endif
+
+ }
+ //T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId));
+ }
+ else
+ {
+ // chunkId == 0, so it is an ObjectHeader.
+ // Thus, we read in the object header and make the object
+ bi->pageBits |= (1 << c);
+ bi->pagesInUse++;
+
+ yaffs_ReadChunkFromNAND(dev,chunk,chunkData,NULL,1);
+
+ oh = (yaffs_ObjectHeader *)chunkData;
+
+ in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,oh->type);
+
+ if(in->valid)
+ {
+ // We have already filled this one. We have a duplicate and need to resolve it.
+
+ unsigned existingSerial = in->serial;
+ unsigned newSerial = tags.serialNumber;
+
+ if(((existingSerial+1) & 3) == newSerial)
+ {
+ // Use new one - destroy the exisiting one
+ yaffs_DeleteChunk(dev,in->chunkId);
+ in->valid = 0;
+ }
+ else
+ {
+ // Use existing - destroy this one.
+ yaffs_DeleteChunk(dev,chunk);
+ }
+ }
+
+ if(!in->valid &&
+ (tags.objectId == YAFFS_OBJECTID_ROOT ||
+ tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))
+ {
+ // We only load some info, don't fiddle with directory structure
+ in->valid = 1;
+ in->variantType = oh->type;
+
+ in->st_mode = oh->st_mode;
+#ifdef CONFIG_YAFFS_WINCE
+ in->win_atime[0] = oh->win_atime[0];
+ in->win_ctime[0] = oh->win_ctime[0];
+ in->win_mtime[0] = oh->win_mtime[0];
+ in->win_atime[1] = oh->win_atime[1];
+ in->win_ctime[1] = oh->win_ctime[1];
+ in->win_mtime[1] = oh->win_mtime[1];
+#else
+ in->st_uid = oh->st_uid;
+ in->st_gid = oh->st_gid;
+ in->st_atime = oh->st_atime;
+ in->st_mtime = oh->st_mtime;
+ in->st_ctime = oh->st_ctime;
+ in->st_rdev = oh->st_rdev;
+#endif
+ in->chunkId = chunk;
+
+ }
+ else if(!in->valid)
+ {
+ // we need to load this info
+
+ in->valid = 1;
+ in->variantType = oh->type;
+
+ in->st_mode = oh->st_mode;
+#ifdef CONFIG_YAFFS_WINCE
+ in->win_atime[0] = oh->win_atime[0];
+ in->win_ctime[0] = oh->win_ctime[0];
+ in->win_mtime[0] = oh->win_mtime[0];
+ in->win_atime[1] = oh->win_atime[1];
+ in->win_ctime[1] = oh->win_ctime[1];
+ in->win_mtime[1] = oh->win_mtime[1];
+#else
+ in->st_uid = oh->st_uid;
+ in->st_gid = oh->st_gid;
+ in->st_atime = oh->st_atime;
+ in->st_mtime = oh->st_mtime;
+ in->st_ctime = oh->st_ctime;
+ in->st_rdev = oh->st_rdev;
+#endif
+ in->chunkId = chunk;
+
+ yaffs_SetObjectName(in,oh->name);
+ in->dirty = 0;
+
+ // directory stuff...
+ // hook up to parent
+
+ parent = yaffs_FindOrCreateObjectByNumber(dev,oh->parentObjectId,YAFFS_OBJECT_TYPE_DIRECTORY);
+ if(parent->variantType == YAFFS_OBJECT_TYPE_UNKNOWN)
+ {
+ // Set up as a directory
+ parent->variantType = YAFFS_OBJECT_TYPE_DIRECTORY;
+ INIT_LIST_HEAD(&parent->variant.directoryVariant.children);
+ }
+ else if(parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
+ {
+ // Hoosterman, another problem....
+ // We're trying to use a non-directory as a directory
+ // Todo ... handle
+ T(YAFFS_TRACE_ERROR, (TSTR("yaffs tradgedy: attempting to use non-directory as a directory in scan" TENDSTR)));
+
+ }
+
+ yaffs_AddObjectToDirectory(parent,in);
+ if(parent == dev->unlinkedDir)
+ {
+ in->deleted = 1; // If it is unlinked at start up then it wants deleting
+ dev->nDeletedFiles++;
+ }
+
+ // Note re hardlinks.
+ // Since we might scan a hardlink before its equivalent object is scanned
+ // we put them all in a list.
+ // After scanning is complete, we should have all the objects, so we run through this
+ // list and fix up all the chains.
+
+ switch(in->variantType)
+ {
+ case YAFFS_OBJECT_TYPE_UNKNOWN: // Todo got a problem
+ break;
+ case YAFFS_OBJECT_TYPE_FILE:
+#ifdef CONFIG_YAFFS_USE_HEADER_FILE_SIZE
+ in->variant.fileVariant.fileSize = oh->fileSize;
+#endif
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ in->variant.hardLinkVariant.equivalentObjectId = oh->equivalentObjectId;
+ (yaffs_Object *)(in->hardLinks.next) = hardList;
+ hardList = in;
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY: // Do nothing
+ break;
+ case YAFFS_OBJECT_TYPE_SPECIAL: // Do nothing
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK: // Do nothing
+ in->variant.symLinkVariant.alias = yaffs_CloneString(oh->alias);
+ break;
+ }
+ //T((" %d %d header %d \"%s\" type %d\n",blk,c,tags.objectId,oh->name,in->variantType));
+ }
+ }
+ }
+
+ if(state == YAFFS_BLOCK_STATE_SCANNING)
+ {
+ // If we got this far while scanning, then the block is fully allocated.
+ state = YAFFS_BLOCK_STATE_FULL;
+ }
+
+ bi->blockState = state;
+
+ // Now let's see if it was dirty
+ if( bi->pagesInUse == 0 &&
+ bi->blockState == YAFFS_BLOCK_STATE_FULL)
+ {
+ yaffs_BlockBecameDirty(dev,blk);
+ }
+
+ }
+
+ // Fix up the hard link chains.
+ // We should now have scanned all the objects, now it's time to add these
+ // hardlinks.
+ while(hardList)
+ {
+ hl = hardList;
+ hardList = (yaffs_Object *)(hardList->hardLinks.next);
+
+ in = yaffs_FindObjectByNumber(dev,hl->variant.hardLinkVariant.equivalentObjectId);
+
+ if(in)
+ {
+ // Add the hardlink pointers
+ hl->variant.hardLinkVariant.equivalentObject=in;
+ list_add(&hl->hardLinks,&in->hardLinks);
+ }
+ else
+ {
+ //Todo Need to report/handle this better.
+ // Got a problem... hardlink to a non-existant object
+ hl->variant.hardLinkVariant.equivalentObject=NULL;
+ INIT_LIST_HEAD(&hl->hardLinks);
+
+ }
+
+ }
+
+
+
+ return YAFFS_OK;
+}
+
+
+////////////////////////// Directory Functions /////////////////////////
+
+
+static void yaffs_AddObjectToDirectory(yaffs_Object *directory, yaffs_Object *obj)
+{
+
+ if(obj->siblings.prev == NULL)
+ {
+ // Not initialised
+ INIT_LIST_HEAD(&obj->siblings);
+
+ }
+ else if(!list_empty(&obj->siblings))
+ {
+ // If it is holed up somewhere else, un hook it
+ list_del_init(&obj->siblings);
+ }
+ // Now add it
+ list_add(&obj->siblings,&directory->variant.directoryVariant.children);
+ obj->parent = directory;
+
+ if(directory == obj->myDev->unlinkedDir)
+ {
+ obj->unlinked = 1;
+ obj->myDev->nUnlinkedFiles++;
+ obj->renameAllowed = 0;
+ }
+}
+
+static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
+{
+ list_del_init(&obj->siblings);
+ obj->parent = NULL;
+}
+
+yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,const char *name)
+{
+ int sum;
+
+ struct list_head *i;
+ char buffer[YAFFS_MAX_NAME_LENGTH+1];
+
+ yaffs_Object *l;
+
+ sum = yaffs_CalcNameSum(name);
+
+ list_for_each(i,&directory->variant.directoryVariant.children)
+ {
+ l = list_entry(i, yaffs_Object,siblings);
+
+ // Special case for lost-n-found
+ if(l->objectId == YAFFS_OBJECTID_LOSTNFOUND)
+ {
+ if(yaffs_strcmp(name,YAFFS_LOSTNFOUND_NAME) == 0)
+ {
+ return l;
+ }
+ }
+ else if(yaffs_SumCompare(l->sum, sum))
+ {
+ // Do a real check
+ yaffs_GetObjectName(l,buffer,YAFFS_MAX_NAME_LENGTH);
+ if(yaffs_strcmp(name,buffer) == 0)
+ {
+ return l;
+ }
+
+
+ }
+ }
+
+ return NULL;
+}
+
+
+int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,int (*fn)(yaffs_Object *))
+{
+ struct list_head *i;
+ yaffs_Object *l;
+
+
+ list_for_each(i,&theDir->variant.directoryVariant.children)
+ {
+ l = list_entry(i, yaffs_Object,siblings);
+ if(!fn(l))
+ {
+ return YAFFS_FAIL;
+ }
+ }
+
+ return YAFFS_OK;
+
+}
+
+
+// GetEquivalentObject dereferences any hard links to get to the
+// actual object.
+
+yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj)
+{
+ if(obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
+ {
+ // We want the object id of the equivalent object, not this one
+ obj = obj->variant.hardLinkVariant.equivalentObject;
+ }
+ return obj;
+
+}
+
+int yaffs_GetObjectName(yaffs_Object *obj,char *name,int buffSize)
+{
+ memset(name,0,buffSize);
+
+ if(obj->objectId == YAFFS_OBJECTID_LOSTNFOUND)
+ {
+ strncpy(name,YAFFS_LOSTNFOUND_NAME,buffSize - 1);
+ }
+ else if(obj->chunkId <= 0)
+ {
+ char locName[20];
+ // make up a name
+ sprintf(locName,"%s%d",YAFFS_LOSTNFOUND_PREFIX,obj->objectId);
+ strncpy(name,locName,buffSize - 1);
+
+ }
+#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
+ else if(obj->shortName[0])
+ {
+ strcpy(name,obj->shortName);
+ }
+#endif
+ else
+ {
+ __u8 buffer[YAFFS_BYTES_PER_CHUNK];
+ yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer;
+
+ memset(buffer,0,YAFFS_BYTES_PER_CHUNK);
+
+ if(obj->chunkId >= 0)
+ {
+ yaffs_ReadChunkFromNAND(obj->myDev,obj->chunkId,buffer,NULL,1);
+ }
+ strncpy(name,oh->name,buffSize - 1);
+ }
+
+ return strlen(name);
+}
+
+int yaffs_GetObjectFileLength(yaffs_Object *obj)
+{
+
+ // Dereference any hard linking
+ obj = yaffs_GetEquivalentObject(obj);
+
+ if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
+ {
+ return obj->variant.fileVariant.fileSize;
+ }
+ if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
+ {
+ return strlen(obj->variant.symLinkVariant.alias);
+ }
+ else
+ {
+ // Only a directory should drop through to here
+ return YAFFS_BYTES_PER_CHUNK;
+ }
+}
+
+int yaffs_GetObjectLinkCount(yaffs_Object *obj)
+{
+ int count = 0;
+ struct list_head *i;
+
+ if(!obj->unlinked)
+ {
+ count++; // the object itself
+ }
+ list_for_each(i,&obj->hardLinks)
+ {
+ count++; // add the hard links;
+ }
+ return count;
+
+}
+
+
+int yaffs_GetObjectInode(yaffs_Object *obj)
+{
+ obj = yaffs_GetEquivalentObject(obj);
+
+ return obj->objectId;
+}
+
+unsigned yaffs_GetObjectType(yaffs_Object *obj)
+{
+ obj = yaffs_GetEquivalentObject(obj);
+
+ switch(obj->variantType)
+ {
+ case YAFFS_OBJECT_TYPE_FILE: return DT_REG; break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY: return DT_DIR; break;
+ case YAFFS_OBJECT_TYPE_SYMLINK: return DT_LNK; break;
+ case YAFFS_OBJECT_TYPE_HARDLINK: return DT_REG; break;
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ if(S_ISFIFO(obj->st_mode)) return DT_FIFO;
+ if(S_ISCHR(obj->st_mode)) return DT_CHR;
+ if(S_ISBLK(obj->st_mode)) return DT_BLK;
+ if(S_ISSOCK(obj->st_mode)) return DT_SOCK;
+ default: return DT_REG; break;
+ }
+}
+
+char *yaffs_GetSymlinkAlias(yaffs_Object *obj)
+{
+ obj = yaffs_GetEquivalentObject(obj);
+ if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
+ {
+ return yaffs_CloneString(obj->variant.symLinkVariant.alias);
+ }
+ else
+ {
+ return yaffs_CloneString("");
+ }
+}
+
+#ifndef CONFIG_YAFFS_WINCE
+
+int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr)
+{
+ unsigned int valid = attr->ia_valid;
+
+ if(valid & ATTR_MODE) obj->st_mode = attr->ia_mode;
+ if(valid & ATTR_UID) obj->st_uid = attr->ia_uid;
+ if(valid & ATTR_GID) obj->st_gid = attr->ia_gid;
+
+ if(valid & ATTR_ATIME) obj->st_atime = attr->ia_atime;
+ if(valid & ATTR_CTIME) obj->st_ctime = attr->ia_ctime;
+ if(valid & ATTR_MTIME) obj->st_mtime = attr->ia_mtime;
+
+ if(valid & ATTR_SIZE) yaffs_ResizeFile(obj,attr->ia_size);
+
+ yaffs_UpdateObjectHeader(obj,NULL,1);
+
+ return YAFFS_OK;
+
+}
+int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr)
+{
+ unsigned int valid = 0;
+
+ attr->ia_mode = obj->st_mode; valid |= ATTR_MODE;
+ attr->ia_uid = obj->st_uid; valid |= ATTR_UID;
+ attr->ia_gid = obj->st_gid; valid |= ATTR_GID;
+
+ attr->ia_atime = obj->st_atime; valid |= ATTR_ATIME;
+ attr->ia_ctime = obj->st_ctime; valid |= ATTR_CTIME;
+ attr->ia_mtime = obj->st_mtime; valid |= ATTR_MTIME;
+
+ attr->ia_size = yaffs_GetFileSize(obj); valid |= ATTR_SIZE;
+
+ attr->ia_valid = valid;
+
+ return YAFFS_OK;
+
+}
+
+#endif
+
+int yaffs_DumpObject(yaffs_Object *obj)
+{
+// __u8 buffer[YAFFS_BYTES_PER_CHUNK];
+ char name[257];
+// yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer;
+
+// memset(buffer,0,YAFFS_BYTES_PER_CHUNK);
+
+// if(obj->chunkId >= 0)
+// {
+// yaffs_ReadChunkFromNAND(obj->myDev,obj->chunkId,buffer,NULL);
+// }
+
+ yaffs_GetObjectName(obj,name,256);
+
+ T(YAFFS_TRACE_ALWAYS,(TSTR("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d chunk %d type %d size %d\n" TENDSTR),
+ obj->objectId,yaffs_GetObjectInode(obj), name, obj->dirty, obj->valid, obj->serial,
+ obj->sum, obj->chunkId, yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
+
+#if 0
+ YPRINTF(("Object %d \"%s\"\n dirty %d valid %d serial %d sum %d chunk %d\n",
+ obj->objectId, oh->name, obj->dirty, obj->valid, obj->serial,
+ obj->sum, obj->chunkId));
+ switch(obj->variantType)
+ {
+ case YAFFS_OBJECT_TYPE_FILE:
+ YPRINTF((" FILE length %d\n",obj->variant.fileVariant.fileSize));
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ YPRINTF((" DIRECTORY\n"));
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK: //todo
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ default:
+ }
+#endif
+
+ return YAFFS_OK;
+}
+
+
+///////////////////////// Initialisation code ///////////////////////////
+
+
+
+int yaffs_GutsInitialise(yaffs_Device *dev)
+{
+ unsigned x;
+ int bits;
+ int extraBits;
+ int nBlocks;
+
+
+
+ if(!yaffs_CheckStructures())
+ {
+ T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
+ return YAFFS_FAIL;
+ }
+
+ if(dev->startBlock <= 0 ||
+ (dev->endBlock - dev->startBlock) < 10)
+ {
+ T(YAFFS_TRACE_ALWAYS,(TSTR("startBlock %d or endBlock %d invalid\n" TENDSTR),
+ dev->startBlock, dev->endBlock));
+ return YAFFS_FAIL;
+ }
+
+ nBlocks = dev->endBlock - dev->startBlock + 1;
+
+
+
+ // OK now calculate a few things for the device
+ // Calculate chunkGroupBits.
+ // We need to find the next power of 2 > than endBlock
+
+ x = YAFFS_CHUNKS_PER_BLOCK * (dev->endBlock+1);
+
+ for(bits = extraBits = 0; x > 1; bits++)
+ {
+ if(x & 1) extraBits++;
+ x >>= 1;
+ }
+
+ if(extraBits > 0) bits++;
+
+
+ // Level0 Tnodes are 16 bits, so if the bitwidth of the
+ // chunk range we're using is greater than 16 we need
+ // to figure out chunk shift and chunkGroupSize
+ if(bits <= 16)
+ {
+ dev->chunkGroupBits = 0;
+ }
+ else
+ {
+ dev->chunkGroupBits = bits - 16;
+ }
+ dev->chunkGroupSize = 1 << dev->chunkGroupBits;
+
+
+ // More device initialisation
+ dev->garbageCollectionRequired = 0;
+ dev->garbageCollections = 0;
+ dev->currentDirtyChecker = 0;
+ dev->bufferedBlock = -1;
+ dev->doingBufferedBlockRewrite = 0;
+ dev->blockSelectedForGC = -1;
+ dev->nDeletedFiles = 0;
+ dev->nBackgroundDeletions=0;
+ dev->nUnlinkedFiles = 0;
+ dev->eccFixed=0;
+ dev->eccUnfixed=0;
+ dev->tagsEccFixed=0;
+ dev->tagsEccUnfixed=0;
+
+ dev->localBuffer = YMALLOC(YAFFS_BYTES_PER_CHUNK);
+
+ yaffs_InitialiseBlocks(dev,nBlocks);
+
+ yaffs_InitialiseTnodes(dev);
+
+ yaffs_InitialiseObjects(dev);
+
+#ifdef CONFIG_YAFFS_SHORT_OP_CACHE
+ {
+ int i;
+ for(i=0; i < YAFFS_N_CACHE_CHUNKS; i++)
+ {
+ dev->srCache[i].object = NULL;
+ dev->srCache[i].lastUse = 0;
+ dev->srCache[i].dirty = 0;
+ }
+ dev->srLastUse = 0;
+ }
+#endif
+
+ dev->cacheHits = 0;
+
+
+ // Initialise the unlinked, root and lost and found directories
+ dev->lostNFoundDir = dev->rootDir = dev->unlinkedDir = NULL;
+
+ dev->unlinkedDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_UNLINKED, S_IFDIR);
+
+ dev->rootDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_ROOT,YAFFS_ROOT_MODE | S_IFDIR);
+ dev->lostNFoundDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_LOSTNFOUND,YAFFS_LOSTNFOUND_MODE | S_IFDIR);
+ yaffs_AddObjectToDirectory(dev->rootDir,dev->lostNFoundDir);
+
+
+ // Now scan the flash.
+ yaffs_Scan(dev);
+
+ // Zero out stats
+ dev->nPageReads = 0;
+ dev->nPageWrites = 0;
+ dev->nBlockErasures = 0;
+ dev->nGCCopies = 0;
+ dev->nRetriedWrites = 0;
+ dev->nRetiredBlocks = 0;
+
+
+ return YAFFS_OK;
+
+}
+
+void yaffs_Deinitialise(yaffs_Device *dev)
+{
+ yaffs_DeinitialiseBlocks(dev);
+ yaffs_DeinitialiseTnodes(dev);
+ yaffs_DeinitialiseObjects(dev);
+
+}
+
+int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
+{
+ int nFree = dev->nFreeChunks - (YAFFS_CHUNKS_PER_BLOCK * YAFFS_RESERVED_BLOCKS);
+
+ struct list_head *i;
+ yaffs_Object *l;
+
+
+ // To the free chunks add the chunks that are in the deleted unlinked files.
+ list_for_each(i,&dev->unlinkedDir->variant.directoryVariant.children)
+ {
+ l = list_entry(i, yaffs_Object,siblings);
+ if(l->deleted)
+ {
+ nFree++;
+ nFree += l->nDataChunks;
+ }
+ }
+
+
+ return (nFree < 0) ? 0 : nFree;
+
+}
+
+
+/////////////////// YAFFS test code //////////////////////////////////
+
+#define yaffs_CheckStruct(structure,syze, name) \
+ if(sizeof(structure) != syze) \
+ { \
+ T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),name,syze,sizeof(structure))); \
+ return YAFFS_FAIL; \
+ }
+
+
+static int yaffs_CheckStructures(void)
+{
+ yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags")
+ yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion")
+ yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare")
+ yaffs_CheckStruct(yaffs_Tnode,2* YAFFS_NTNODES_LEVEL0,"yaffs_Tnode")
+ yaffs_CheckStruct(yaffs_ObjectHeader,512,"yaffs_ObjectHeader")
+
+
+ return YAFFS_OK;
+}
+
+#if 0
+void yaffs_GutsTest(yaffs_Device *dev)
+{
+
+ if(yaffs_CheckStructures() != YAFFS_OK)
+ {
+ T(YAFFS_TRACE_ALWAYS,(TSTR("One or more structures malformed-- aborting\n" TENDSTR)));
+ return;
+ }
+
+ yaffs_TnodeTest(dev);
+ yaffs_ObjectTest(dev);
+}
+#endif
+
+
+
projects / yaffs / .git / commitdiff