X-Git-Url: http://www.aleph1.co.uk/gitweb/?p=yaffs%2F.git;a=blobdiff_plain;f=yaffs_guts.c;h=fcb217ae850f3b4d98fc85abccac0c7a43684b26;hp=abb01e2c1694ede4e0be49e82b7c9e564c560029;hb=f0494eb05c40ce19d74bedc92a020a743fbec08e;hpb=e7944bf67d156b9ecb1c8cdf9223dfb0e3154ba4 diff --git a/yaffs_guts.c b/yaffs_guts.c index abb01e2..fcb217a 100644 --- a/yaffs_guts.c +++ b/yaffs_guts.c @@ -1,3707 +1,5042 @@ -/* - * 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 - * - * 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 - -#include "yportenv.h" - -#include "yaffsinterface.h" -#include "yaffs_guts.h" - - - -// 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; -} - - - -// Device info -//static yaffs_Device *yaffs_device; -//yaffs_Object *yaffs_rootDir; -//yaffs_Object *yaffs_lostNFound; - - - -// Local prototypes -static int yaffs_CheckObjectHashSanity(yaffs_Device *dev); -static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr); -static void yaffs_GetTagsFromSpare(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); -static void yaffs_DeleteChunk(yaffs_Device *dev,int chunkId); -static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj); -static int yaffs_CheckStructures(void); - -// 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_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 int __inline__ 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) -{ - dev->nPageWrites++; - return dev->writeChunkToNAND(dev,chunkInNAND,data,spare); -} - - -int yaffs_ReadChunkFromNAND(struct yaffs_DeviceStruct *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare,int doErrorCorrection) -{ - int retVal; - __u8 calcEcc[3]; - yaffs_Spare localSpare; - int eccResult1,eccResult2; - - 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; - } - - retVal = dev->readChunkFromNAND(dev,chunkInNAND,data,spare); - if(data && doErrorCorrection) - { - // Do ECC correction - //Todo handle any errors - nand_calculate_ecc(data,calcEcc); - eccResult1 = nand_correct_data (data,spare->ecc1, calcEcc); - nand_calculate_ecc(&data[256],calcEcc); - eccResult2 = nand_correct_data (&data[256],spare->ecc2, calcEcc); - - if(eccResult1>0) - { - T((TSTR("**>>ecc error fix performed on chunk %d:0" TENDSTR),chunkInNAND)); - } - else if(eccResult1<0) - { - T((TSTR("**>>ecc error unfixed on chunk %d:0" TENDSTR),chunkInNAND)); - } - - if(eccResult2>0) - { - T((TSTR("**>>ecc error fix performed on chunk %d:1" TENDSTR),chunkInNAND)); - } - else if(eccResult2<0) - { - T((TSTR("**>>ecc error unfixed on chunk %d:1" TENDSTR),chunkInNAND)); - } - - if(eccResult1 || eccResult2) - { - // Hoosterman, we had a data problem on this page - yaffs_HandleReadDataError(dev,chunkInNAND); - } - } - return retVal; -} - - -static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,int chunkInNAND) -{ -#if 1 - - 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; - -#endif - - 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... - writeOk = yaffs_CheckChunkErased(dev,chunk); - - if(writeOk) - { - 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); - - if(!yaffs_VerifyCompare(data,rbData,spare,&rbSpare)) - { - // Didn't verify - T((TSTR("**>> yaffs write failed on chunk %d" TENDSTR), chunk)); - // yaffs_DeleteChunk(dev,chunk); - - writeOk = 0; - } - - } - 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((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); - - dev->blockInfo[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; -} - - -static void yaffs_HandleReadDataError(yaffs_Device *dev,int chunkInNAND) -{ - - // 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) -{ -} - - - - -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; - - while (*bname) - { - sum += (*bname) * i; - i++; - bname++; - } - return sum; -} - - -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 &0x7f; j<<=1) - { - bit++; - if(b[i] & j) - { - ecc ^= bit; - } - } - } - - tags->ecc = ecc; - - -} - -void yaffs_CheckECCOnTags(yaffs_Tags *tags) -{ - unsigned ecc = tags->ecc; - - yaffs_CalcTagsECC(tags); - - ecc ^= tags->ecc; - - if(ecc) - { - // Needs fixing - unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes; - - ecc--; - - b[ecc / 8] ^= (1 << (ecc & 7)); - - // Now recvalc the ecc - yaffs_CalcTagsECC(tags); - } -} - - -///////////////////////// 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) - { - YALERT("Could not malloc tnodes"); - 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. - - tnl = YMALLOC(sizeof(yaffs_TnodeList)); - if(!tnl) - { - YALERT("Could not add tnodes to management list"); - } - else - { - tnl->tnodes = newTnodes; - tnl->next = dev->allocatedTnodeList; - dev->allocatedTnodeList = tnl; - } - - - YINFO("Tnodes created"); - - - 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; - -} - -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; - } - - } -} - -////////////////// 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; - - __u32 i; - __u32 l; - - - //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) - - i = chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS); - requiredTallness = 0; - while(i) - { - i >>= 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 - { - YALERT("No more tnodes"); - } - } - - fStruct->topLevel = requiredTallness; - } - - - // Traverse down to level 0, adding anything we need - - l = fStruct->topLevel; - tn = fStruct->top; - while (l > 0 && tn) - { - i = (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[i]) - { - //T((TSTR(" added"))); - - tn->internal[i] = yaffs_GetTnode(dev); - } - - tn = tn->internal[i]; - l--; - - } - - //TSTR(TENDSTR))); - - return tn; -} - -// DeleteWorker scans backwards through the tnode tree and delets all the -// chunks and tnodes in the file - -static void yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, int chunkOffset) -{ - int i; - int chunkInInode; - int theChunk; - yaffs_Tags tags; - int found; - int chunkDeleted; - - - if(tn) - { - if(level > 0) - { - - for(i = YAFFS_NTNODES_INTERNAL -1; i >= 0; i--) - { - if(tn->internal[i]) - { - yaffs_DeleteWorker(in,tn->internal[i],level - 1, - (chunkOffset << YAFFS_TNODES_INTERNAL_BITS ) + i ); - yaffs_FreeTnode(in->myDev,tn->internal[i]); - tn->internal[i] = NULL; - } - - } - } - else if(level == 0) - { - for(i = YAFFS_NTNODES_LEVEL0 -1; i >= 0; i--) - { - 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); - - } - - tn->level0[i] = 0; - } - - } - - } - - } - -} - - - - -// 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 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) - { - YALERT("Could not allocate more objects"); - 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) - { - YALERT("Could not add Objects to management list"); - } - else - { - list->objects = newObjects; - list->next = dev->allocatedObjectList; - dev->allocatedObjectList = list; - } - - - YINFO("Objects created"); - - - 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->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->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; - - int n = 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,int 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; - theObject->myDev = dev; - yaffs_HashObject(theObject); - theObject->variantType = type; - theObject->st_atime = theObject->st_mtime = theObject->st_ctime = CURRENT_TIME; - - 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; - in->st_rdev = rdev; - in->st_uid = uid; - in->st_gid = gid; - in->st_atime = in->st_mtime = in->st_ctime = CURRENT_TIME; - - in->nDataChunks = 0; - - in->sum = yaffs_CalcNameSum(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_UpdateObjectHeader(in,name) < 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) -{ - //yaffs_Device *dev = obj->myDev; - - if(newDir == NULL) - { - newDir = obj->parent; // use the old directory - } - - // Only proceed if the new name does not exist and - // if we're putting it into a directory. - if(!yaffs_FindObjectByName(newDir,newName) && - newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) - { - obj->sum = yaffs_CalcNameSum(newName); - obj->dirty = 1; - yaffs_AddObjectToDirectory(newDir,obj); - - if(yaffs_UpdateObjectHeader(obj,newName) >= 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; - - obj = yaffs_FindObjectByName(oldDir,oldName); - if(obj && obj->renameAllowed) - { - return yaffs_ChangeObjectName(obj,newDir,newName); - } - 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) - { - YALERT("Inode hash inconsistency"); - ok = YAFFS_FAIL; - } - } - - return ok; -} - -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); - } - -} - - - -/////////////////////////// Block Management and Page Allocation /////////////////// - - -static void yaffs_InitialiseBlocks(yaffs_Device *dev) -{ - //Todo we're assuming the malloc will pass. - dev->blockInfo = YMALLOC(dev->nBlocks * sizeof(yaffs_BlockInfo)); - memset(dev->blockInfo,0,dev->nBlocks * sizeof(yaffs_BlockInfo)); - dev->allocationBlock = -1; // force it to get a new one -} - -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 - - for(i = dev->startBlock; i <= dev->endBlock && pagesInUse > 2 ; i++) - { - b++; - if (b > dev->endBlock) - { - b = dev->startBlock; - } - - if(dev->blockInfo[b].blockState == YAFFS_BLOCK_STATE_FULL && - (dev->blockInfo)[b].pagesInUse < pagesInUse) - { - dirtiest = b; - pagesInUse = (dev->blockInfo)[b].pagesInUse; - } - } - - dev->currentDirtyChecker = b; - - return dirtiest; -} - - -static int yaffs_FindBlockForAllocation(yaffs_Device *dev,int useReserve) -{ - int i; - - if(useReserve && dev->nErasedBlocks < 1) - { - // Hoosterman we've got a problem. - // Can't get space to gc - return -1; - } - else if(!useReserve && dev->nErasedBlocks <= YAFFS_RESERVED_BLOCKS) - { - // We are not in GC, so we hold some in reserve so we can get - // a gc done. - } - - // Find an empty block. - - for(i = dev->startBlock; i <= dev->endBlock; i++) - { - - if(dev->blockInfo[i].blockState == YAFFS_BLOCK_STATE_EMPTY) - { - dev->blockInfo[i].blockState = YAFFS_BLOCK_STATE_ALLOCATING; - dev->nErasedBlocks--; - if(dev->nErasedBlocks <= YAFFS_RESERVED_BLOCKS) - { - dev->garbageCollectionRequired = 1; - } - - return i; - } - } - - return -1; -} - - -static void yaffs_BlockBecameDirty(yaffs_Device *dev,int blockNo) -{ - yaffs_BlockInfo *bi = &dev->blockInfo[blockNo]; - - // Mark as dirty. - // 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 && yaffs_EraseBlockInNAND(dev,blockNo)) - { - bi->blockState = YAFFS_BLOCK_STATE_EMPTY; - dev->nErasedBlocks++; - bi->pagesInUse = 0; - bi->pageBits = 0; - - T((TSTR("Erased block %d" TENDSTR),blockNo)); - } - else - { - yaffs_RetireBlock(dev,blockNo); - T((TSTR("**>> Block %d retired" TENDSTR),blockNo)); - } -} - - -static int yaffs_AllocateChunk(yaffs_Device *dev,int useReserve) -{ - int retVal; - - if(dev->allocationBlock < 0) - { - // Get next block to allocate off - dev->allocationBlock = yaffs_FindBlockForAllocation(dev,useReserve); - dev->allocationPage = 0; - } - - // Next page please.... - if(dev->allocationBlock >= 0) - { - retVal = (dev->allocationBlock * YAFFS_CHUNKS_PER_BLOCK) + - dev->allocationPage; - dev->blockInfo[dev->allocationBlock].pagesInUse++; - dev->blockInfo[dev->allocationBlock].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) - { - dev->blockInfo[dev->allocationBlock].blockState = YAFFS_BLOCK_STATE_FULL; - dev->allocationBlock = -1; - } - -#ifdef YAFFS_PARANOID - if(yaffs_CheckChunkErased(dev,retVal) == YAFFS_FAIL) - { - T((TSTR("..................Trying to allocate non-erased page %d" TENDSTR),retVal)); - } -#endif - return retVal; - - } - T((TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR))); - - return -1; -} - - -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 = &dev->blockInfo[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(&spare,&tags); - tags.serialNumber++; - yaffs_LoadTagsIntoSpare(&spare,&tags); - -#if 0 - newChunk = yaffs_AllocatePage(dev,1); - if(newChunk < 0) - { - return YAFFS_FAIL; - } - - yaffs_WriteChunkToNAND(dev,newChunk, buffer, &spare); - -#else - newChunk = yaffs_WriteNewChunkToNAND(dev, buffer, &spare,1); -#endif - if(newChunk < 0) - { - return YAFFS_FAIL; - } - - object = yaffs_FindObjectByNumber(dev,tags.objectId); - - // 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; -} - -int yaffs_CheckGarbageCollection(yaffs_Device *dev) -{ - int block; - - if(dev->garbageCollectionRequired) - { - 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_Spare *sparePtr,yaffs_Tags *tagsPtr) -{ - yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr; - - 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; - - yaffs_CheckECCOnTags(tagsPtr); -} - -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(&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); - - - if(buffer) - { - yaffs_CalcECC(buffer,&spare); - } - - 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); - - - if(buffer) - { - yaffs_CalcECC(buffer,&spare); - } - - 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; -} - - -#if 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? - // todo - } - - - // 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; - - 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); - - - // Pull out of the management area. - // If the whole block became dirty, this will kick off an erasure. - if( dev->blockInfo[block].blockState == YAFFS_BLOCK_STATE_ALLOCATING || - dev->blockInfo[block].blockState == YAFFS_BLOCK_STATE_FULL) - { - dev->nFreeChunks++; - - dev->blockInfo[block].pageBits &= ~(1 << page); - dev->blockInfo[block].pagesInUse--; - - if( dev->blockInfo[block].pagesInUse == 0 && - dev->blockInfo[block].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); - - - #if 0 - // Create new chunk in NAND - newChunkId = yaffs_AllocatePage(dev,useReserve); - - - if(newChunkId >= 0) - { - - - yaffs_WriteChunkWithTagsToNAND(dev,newChunkId,buffer,&newTags); - - yaffs_PutChunkIntoFile(in,chunkInInode,newChunkId); - - - if(prevChunkId >= 0) - { - yaffs_DeleteChunk(dev,prevChunkId); - - } - - yaffs_CheckFileSanity(in); - - return newChunkId; - } - - - return -1; -#else - - 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; - -#endif - - - -} - - -// 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) -{ - - 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) - { - - 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; - 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; - - oh->parentObjectId = in->parent->objectId; - 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 - { - memcpy(oh->name, ohOld->name,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); - - - -#if 0 - // Create new chunk in NAND - newChunkId = yaffs_AllocatePage(dev,1); - - if(newChunkId >= 0) - { - - yaffs_WriteChunkWithTagsToNAND(dev,newChunkId,bufferNew,&newTags); - - in->chunkId = newChunkId; - - if(prevChunkId >= 0) - { - yaffs_DeleteChunk(dev,prevChunkId); - } - - in->dirty = 0; - return newChunkId; - } - - return -1; -#else - // 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; - -#endif - } - return 0; -} - - - -///////////////////////// 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) -{ - -// yaffs_Device *dev = in->myDev; - - __u8 localBuffer[YAFFS_BYTES_PER_CHUNK]; - - int chunk; - int start; - int nToCopy; - int n = nBytes; - int nDone = 0; - - 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) - // Read into the local buffer then copy... - - yaffs_ReadChunkDataFromObject(in,chunk,localBuffer); - memcpy(buffer,&localBuffer[start],nToCopy); - } - else - { - // A full chunk. Read directly into the supplied buffer. - yaffs_ReadChunkDataFromObject(in,chunk,buffer); - } - - n -= nToCopy; - offset += nToCopy; - buffer += nToCopy; - nDone += nToCopy; - - } - - return nDone; -} - - -int yaffs_WriteDataToFile(yaffs_Object *in,const __u8 * buffer, __u32 offset, int nBytes) -{ - __u8 localBuffer[YAFFS_BYTES_PER_CHUNK]; - - int chunk; - int start; - int nToCopy; - int n = nBytes; - int nDone = 0; - int nToWriteBack; - int endOfWrite = offset+nBytes; - int chunkWritten = 0; - - 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; - nToWriteBack = (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) - // Read into the local buffer then copy, then copy over and write back. - - yaffs_ReadChunkDataFromObject(in,chunk,localBuffer); - - memcpy(&localBuffer[start],buffer,nToCopy); - - chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,localBuffer,nToWriteBack,0); - - //T(("Write with readback to chunk %d %d\n",chunk,chunkWritten)); - - } - else - { - // A full chunk. Write directly from the supplied buffer. - chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,buffer,YAFFS_BYTES_PER_CHUNK,0); - //T(("Write to chunk %d %d\n",chunk,chunkWritten)); - } - - if(chunkWritten >= 0) - { - n -= nToCopy; - offset += nToCopy; - buffer += nToCopy; - nDone += nToCopy; - } - - } - - // Update file object - - if(endOfWrite > in->variant.fileVariant.fileSize) - { - in->variant.fileVariant.fileSize = endOfWrite; - } - - in->dirty = 1; - /*in->st_mtime = CURRENT_TIME; only update in flush*/ - - 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; - - __u8 localBuffer[YAFFS_BYTES_PER_CHUNK]; - - 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,localBuffer); - - yaffs_WriteChunkDataToObject(in,lastChunk,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")); - - in->st_mtime = CURRENT_TIME; - - retVal = yaffs_UpdateObjectHeader(in,NULL); - } - else - { - retVal = YAFFS_OK; - } - - return retVal; - -} - - -static int yaffs_DoGenericObjectDeletion(yaffs_Object *in) -{ - yaffs_RemoveObjectFromDirectory(in); - yaffs_DeleteChunk(in->myDev,in->chunkId); - 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_DeleteFile(yaffs_Object *in) -{ - // Delete the file data & tnodes -#if 0 - yaffs_ResizeFile(in,0); -#else - yaffs_DeleteWorker(in, in->variant.fileVariant.top, in->variant.fileVariant.topLevel, 0); - -#endif - - yaffs_FreeTnode(in->myDev,in->variant.fileVariant.top); - - return yaffs_DoGenericObjectDeletion(in); -} - -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)) - { -#if 0 - // Curve ball: We're unlinking an object that has a hardlink. - // Therefore we can't really delete the object. - // Instead, we do the following: - // - Select a hardlink. - // - Re-type a hardlink as the equivalent object and populate the fields, including the - // objectId. Updating the object id is important so that all the hardlinks do not need - // to be rewritten. - // - Update the equivalet object pointers. - // - Delete all object. - - yaffs_Object *hl; - struct list_head *i; - - - yaffs_RemoveObjectFromDirectory(obj); - - - - hl = list_entry(obj->hardLinks.next, yaffs_Object,hardLinks); - - hl->dirty = 1; - hl->st_mode = obj->st_mode; - hl->st_uid = obj->st_uid; - hl->st_gid = obj->st_gid; - hl->st_atime = obj->st_atime; - hl->st_mtime = obj->st_mtime; - hl->st_ctime = obj->st_ctime; - hl->st_rdev = obj->st_rdev; - - hl->variantType = obj->variantType; - - switch(hl->variantType) - { - case YAFFS_OBJECT_TYPE_FILE: - case YAFFS_OBJECT_TYPE_SYMLINK: - case YAFFS_OBJECT_TYPE_SPECIAL: - // These types are OK to just copy across. - hl->variant = obj->variant; - break; - case YAFFS_OBJECT_TYPE_DIRECTORY: - // Fix the list up - list_add(&hl->variant.directoryVariant.children, - &obj->variant.directoryVariant.children); - list_del(&obj->variant.directoryVariant.children); - - // Now change all the directory children to point to the new parent. - list_for_each(i,&hl->variant.directoryVariant.children) - { - list_entry(i,yaffs_Object,siblings)->parent = hl; - } - break; - - case YAFFS_OBJECT_TYPE_HARDLINK: - case YAFFS_OBJECT_TYPE_UNKNOWN: - // Should not be either of these types. - } - - // Now fix up the hardlink chain - list_del(&obj->hardLinks); - - list_for_each(i,&hl->hardLinks) - { - list_entry(i,yaffs_Object,hardLinks)->variant.hardLinkVariant.equivalentObject = hl; - list_entry(i,yaffs_Object,hardLinks)->variant.hardLinkVariant.equivalentObjectId = hl->objectId; - } - - // Now fix up the hash links. - yaffs_UnhashObject(hl); - hl->objectId = obj->objectId; - yaffs_HashObject(hl); - - // Update the hardlink which has become an object - yaffs_UpdateObjectHeader(hl,NULL); - - // Finally throw away the deleted object - yaffs_DeleteChunk(obj->myDev,obj->chunkId); - yaffs_FreeObject(obj); - - return YAFFS_OK; -#else - // 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); - - if(retVal == YAFFS_OK) - { - retVal = yaffs_DoGenericObjectDeletion(hl); - } - return retVal; - -#endif - - - } - else - { - switch(obj->variantType) - { - case YAFFS_OBJECT_TYPE_FILE: - return yaffs_DeleteFile(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_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; - dev->blockInfo[blk].pageBits = 0; - dev->blockInfo[blk].pagesInUse = 0; - state = YAFFS_BLOCK_STATE_SCANNING; - - - if(yaffs_IsBlockBad(dev,blk)) - { - state = YAFFS_BLOCK_STATE_DEAD; - T((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(&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((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. - dev->blockInfo[blk].pageBits |= (1 << c); - dev->blockInfo[blk].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 variant.fileVariant.scannedFileSize = endpos; - } - //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 - dev->blockInfo[blk].pageBits |= (1 << c); - dev->blockInfo[blk].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) - { - // we need to load this info - - in->valid = 1; - in->variantType = oh->type; - - in->st_mode = oh->st_mode; - 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; - in->chunkId = chunk; - - in->sum = oh->sum; - 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 - } - - yaffs_AddObjectToDirectory(parent,in); - - // 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: - in->variant.fileVariant.fileSize = oh->fileSize; - 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; - } - - dev->blockInfo[blk].blockState = state; - - // Now let's see if it was dirty - if( dev->blockInfo[blk].pagesInUse == 0 && - dev->blockInfo[blk].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; -} - -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); - - } - 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 = 1; // the object itself - struct list_head *i; - - list_for_each(i,&obj->hardLinks) - { - count++; - } - 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(""); - } -} - - -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); - - 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; - -} - - - -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); - - YPRINTF(("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d chunk %d type %d size %d\n", - 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 nChunks,x; - int bits; - - - - if(!yaffs_CheckStructures()) - { - return YAFFS_FAIL; - } - - - // OK now calculate a few things for the device - // Calculate chunkGroupBits. - // If there are 64k or less chunks then this is 1 - // Else it is log2(nChunks) - 16 - // - x = nChunks = YAFFS_CHUNKS_PER_BLOCK * dev->nBlocks; - - for(bits = 0, x = nChunks; (x & 1) == 0; bits++) - { - x >>= 1; - } - - if( x != 1) - { - // Not a power of 2 - YPRINTF(("nBlocks should be a power of 2 but is %u\n", - dev->nBlocks)); - return YAFFS_FAIL; - } - - if(bits <= 16) - { - dev->chunkGroupBits = 0; - dev->chunkGroupSize = 1; - } - else - { - dev->chunkGroupBits = bits - 16; - dev->chunkGroupSize = nChunks>> 16; - } - - // More device initialisation - dev->garbageCollectionRequired = 0; - dev->currentDirtyChecker = 0; - dev->bufferedBlock = -1; - dev->doingBufferedBlockRewrite = 0; - dev->blockSelectedForGC = -1; - - yaffs_InitialiseBlocks(dev); - - yaffs_InitialiseTnodes(dev); - - yaffs_InitialiseObjects(dev); - - - // Initialise the root and lost and found directories - dev->lostNFoundDir = dev->rootDir = NULL; - dev->rootDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_ROOT,YAFFS_ROOT_MODE | S_IFDIR); - dev->lostNFoundDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_LOSTNFOUND,YAFFS_ROOT_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); - - return (nFree < 0) ? 0 : nFree; - -} - - -/////////////////// YAFFS test code ////////////////////////////////// - -#define yaffs_CheckStruct(structure,syze, name) \ - if(sizeof(structure) != syze) \ - { YPRINTF(("%s should be %d but is %d\n",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; -} - -void yaffs_GutsTest(yaffs_Device *dev) -{ - - if(yaffs_CheckStructures() != YAFFS_OK) - { - YPRINTF(("One or more structures malformed-- aborting\n")); - return; - } - else - { - YPRINTF(("Structures OK\n")); - } - - yaffs_TnodeTest(dev); - yaffs_ObjectTest(dev); -} - - +/* + * 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 + * + * 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 1.44 2005-11-07 07:03:02 charles Exp $"; + +#include "yportenv.h" + +#include "yaffsinterface.h" +#include "yaffs_guts.h" + +#define YAFFS_PASSIVE_GC_CHUNKS 2 + +#if 0 +// Use Steven Hill's ECC struff instead +// 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); +#define yaffs_ECCCalculate(data,ecc) nand_calculate_ecc(data,ecc) +#define yaffs_ECCCorrect(data,read_ecc,calc_ecc) nand_correct_ecc(data,read_ecc,calc_ecc) +#else +#include "yaffs_ecc.h" +#endif + +// 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,int markNAND); +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 void yaffs_AbortHalfCreatedObject(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); + +// Chunk bitmap manipulations + +static __inline __u8 *yaffs_BlockBits(yaffs_Device *dev, int blk) +{ + if(blk < dev->internalStartBlock || blk > dev->internalEndBlock) + { + T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),blk)); + YBUG(); + } + return dev->chunkBits + (dev->chunkBitmapStride * (blk - dev->internalStartBlock)); +} + +static __inline__ void yaffs_ClearChunkBits(yaffs_Device *dev,int blk) +{ + __u8 *blkBits = yaffs_BlockBits(dev,blk); + + memset(blkBits,0,dev->chunkBitmapStride); +} + +static __inline__ void yaffs_ClearChunkBit(yaffs_Device *dev,int blk,int chunk) +{ + __u8 *blkBits = yaffs_BlockBits(dev,blk); + + blkBits[chunk/8] &= ~ (1<<(chunk & 7)); +} + +static __inline__ void yaffs_SetChunkBit(yaffs_Device *dev,int blk,int chunk) +{ + __u8 *blkBits = yaffs_BlockBits(dev,blk); + + blkBits[chunk/8] |= (1<<(chunk & 7)); +} + +static __inline__ int yaffs_CheckChunkBit(yaffs_Device *dev,int blk,int chunk) +{ + __u8 *blkBits = yaffs_BlockBits(dev,blk); + return (blkBits[chunk/8] & (1<<(chunk & 7))) ? 1 :0; +} + +static __inline__ int yaffs_StillSomeChunkBits(yaffs_Device *dev,int blk) +{ + __u8 *blkBits = yaffs_BlockBits(dev,blk); + int i; + for(i = 0; i < dev->chunkBitmapStride; i++) + { + if(*blkBits) return 1; + blkBits++; + } + return 0; +} + +// Function to manipulate block info +static __inline__ yaffs_BlockInfo* yaffs_GetBlockInfo(yaffs_Device *dev, int blk) +{ + if(blk < dev->internalStartBlock || blk > dev->internalEndBlock) + { + T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs: getBlockInfo block %d is not valid" TENDSTR),blk)); + YBUG(); + } + return &dev->blockInfo[blk - dev->internalStartBlock]; +} + + +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->internalStartBlock * dev->nChunksPerBlock) + { + T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs chunk %d is not valid" TENDSTR),chunkInNAND)); + return YAFFS_FAIL; + } + + dev->nPageWrites++; + return dev->writeChunkToNAND(dev,chunkInNAND - dev->chunkOffset,data,spare); +} + + + +int yaffs_ReadChunkFromNAND(struct yaffs_DeviceStruct *dev, + int chunkInNAND, + __u8 *data, + yaffs_Spare *spare, + int doErrorCorrection) +{ + int retVal; + yaffs_Spare localSpare; + + 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; + } + + + if(!dev->useNANDECC) + { + retVal = dev->readChunkFromNAND(dev,chunkInNAND - dev->chunkOffset,data,spare); + if(data && doErrorCorrection) + { + // Do ECC correction + //Todo handle any errors + int eccResult1,eccResult2; + __u8 calcEcc[3]; + + yaffs_ECCCalculate(data,calcEcc); + eccResult1 = yaffs_ECCCorrect (data,spare->ecc1, calcEcc); + yaffs_ECCCalculate(&data[256],calcEcc); + eccResult2 = yaffs_ECCCorrect(&data[256],spare->ecc2, calcEcc); + + if(eccResult1>0) + { + T(YAFFS_TRACE_ERROR, (TSTR("**>>ecc error fix performed on chunk %d:0" TENDSTR),chunkInNAND - dev->chunkOffset)); + dev->eccFixed++; + } + else if(eccResult1<0) + { + T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:0" TENDSTR),chunkInNAND - dev->chunkOffset)); + dev->eccUnfixed++; + } + + if(eccResult2>0) + { + T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error fix performed on chunk %d:1" TENDSTR),chunkInNAND - dev->chunkOffset)); + dev->eccFixed++; + } + else if(eccResult2<0) + { + T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:1" TENDSTR),chunkInNAND - dev->chunkOffset)); + dev->eccUnfixed++; + } + + if(eccResult1 || eccResult2) + { + // Hoosterman, we had a data problem on this page + yaffs_HandleReadDataError(dev,chunkInNAND); + } + } + } + else + { + // Must allocate enough memory for spare+2*sizeof(int) for ecc results from device. + struct yaffs_NANDSpare nspare; + retVal = dev->readChunkFromNAND(dev,chunkInNAND - dev->chunkOffset,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 - dev->chunkOffset)); + } + else if(nspare.eccres1<0) + { + T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:0" TENDSTR),chunkInNAND - dev->chunkOffset)); + } + + if(nspare.eccres2>0) + { + T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error fix performed on chunk %d:1" TENDSTR),chunkInNAND - dev->chunkOffset)); + } + else if(nspare.eccres2<0) + { + T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:1" TENDSTR),chunkInNAND - dev->chunkOffset)); + } + + if(nspare.eccres1 || nspare.eccres2) + { + // Hoosterman, we had a data problem on this page + yaffs_HandleReadDataError(dev,chunkInNAND); + } + + } + } + 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]; + // Might as well always allocate the larger size for dev->useNANDECC == true; + static __u8 spare[sizeof(struct yaffs_NANDSpare)]; + + dev->readChunkFromNAND(dev,chunkInNAND - dev->chunkOffset,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 - dev->blockOffset); +} + +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; + + // TODO change this retirement marking for other NAND types + yaffs_WriteChunkToNAND(dev, blockInNAND * dev->nChunksPerBlock, NULL , &spare); + yaffs_WriteChunkToNAND(dev, blockInNAND * dev->nChunksPerBlock + 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/dev->nChunksPerBlock; + + // 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/dev->nChunksPerBlock; + + // Mark the block for retirement + yaffs_GetBlockInfo(dev,blockInNAND)->needsRetiring = 1; + // Delete the chunk + yaffs_DeleteChunk(dev,chunkInNAND,1); +} + + + + +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_CASE_INSENSITIVE + 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) +{ + yaffs_ECCCalculate(data , spare->ecc1); + yaffs_ECCCalculate(&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]; +#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG + newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = 1; +#endif + } + + newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes; +#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG + newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = 1; +#endif + 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; +#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG + if(tn->internal[YAFFS_NTNODES_INTERNAL] != 1) + { + // Hoosterman, this thing looks like it isn't in the list + T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: Tnode list bug 1" TENDSTR))); + } +#endif + 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) +{ + if(tn) + { +#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG + if(tn->internal[YAFFS_NTNODES_INTERNAL] != 0) + { + // Hoosterman, this thing looks like it is already in the list + T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: Tnode list bug 2" TENDSTR))); + } + tn->internal[YAFFS_NTNODES_INTERNAL] = 1; +#endif + tn->internal[0] = dev->freeTnodes; + dev->freeTnodes = tn; + dev->nFreeTnodes++; + } +} + + +static void yaffs_DeinitialiseTnodes(yaffs_Device*dev) +{ + // Free the list of allocated tnodes + yaffs_TnodeList *tmp; + + while(dev->allocatedTnodeList) + { + tmp = dev->allocatedTnodeList->next; + + YFREE(dev->allocatedTnodeList->tnodes); + YFREE(dev->allocatedTnodeList); + dev->allocatedTnodeList = tmp; + + } + + 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) + { + int hitLimit = 0; + + for(i = YAFFS_NTNODES_LEVEL0 -1; i >= 0 && !hitLimit; i--) + { + 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,1); + in->nDataChunks--; + if(limit) + { + *limit = *limit-1; + if(*limit <= 0) + { + hitLimit = 1; + } + } + + } + + tn->level0[i] = 0; + } + + } + return (i < 0) ? 1 : 0; + + + } + + } + + return 1; + +} + +// SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file. +// All soft deleting does is increment the block's softdelete count and pulls the chunk out +// of the tnode. +// THus, essentially this is the same as DeleteWorker except that the chunks are soft deleted. +// +static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, int chunkOffset) +{ + int i; + int chunkInInode; + int theChunk; + yaffs_BlockInfo *theBlock; + 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]) + { + allDone = yaffs_SoftDeleteWorker(in,tn->internal[i],level - 1, + (chunkOffset << YAFFS_TNODES_INTERNAL_BITS ) + i); + if(allDone) + { + yaffs_FreeTnode(in->myDev,tn->internal[i]); + tn->internal[i] = NULL; + } + else + { + //Hoosterman... how could this happen. + } + } + } + return (allDone) ? 1 : 0; + } + else if(level == 0) + { + + for(i = YAFFS_NTNODES_LEVEL0 -1; i >=0; i--) + { + if(tn->level0[i]) + { + // Note this does not find the real chunk, only the chunk group. + // We make an assumption that a chunk group is niot larger than a block. + theChunk = (tn->level0[i] << in->myDev->chunkGroupBits); + T(YAFFS_TRACE_SCAN,(TSTR("soft delete tch %d cgb %d chunk %d" TENDSTR), + tn->level0[i],in->myDev->chunkGroupBits,theChunk)); + + theBlock = yaffs_GetBlockInfo(in->myDev, theChunk/in->myDev->nChunksPerBlock); + if(theBlock) + { + theBlock->softDeletions++; + } + tn->level0[i] = 0; + } + + } + return 1; + + } + + } + + return 1; + +} + + + +static void yaffs_SoftDeleteFile(yaffs_Object *obj) +{ + if(obj->deleted && + obj->variantType == YAFFS_OBJECT_TYPE_FILE && + !obj->softDeleted) + { + if(obj->nDataChunks <= 0) + { + // Empty file, just delete it immediately + yaffs_FreeTnode(obj->myDev,obj->variant.fileVariant.top); + obj->variant.fileVariant.top = NULL; + T(YAFFS_TRACE_TRACING,(TSTR("yaffs: Deleting empty file %d" TENDSTR),obj->objectId)); + yaffs_DoGenericObjectDeletion(obj); + } + else + { + yaffs_SoftDeleteWorker(obj, obj->variant.fileVariant.top, obj->variant.fileVariant.topLevel, 0); + obj->softDeleted = 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 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++) + { + newObjects[i].siblings.next = (struct list_head *)(&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->yst_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; + +#ifdef __KERNEL__ + if(tn->myInode) + { + // We're still hooked up to a cached inode. + // Don't delete now, but mark for later deletion + tn->deferedFree = 1; + return; + } +#endif + + yaffs_UnhashObject(tn); + + // Link into the free list. + tn->siblings.next = (struct list_head *)(dev->freeObjects); + dev->freeObjects = tn; + dev->nFreeObjects++; +} + + +#ifdef __KERNEL__ + +void yaffs_HandleDeferedFree(yaffs_Object *obj) +{ + if(obj->deferedFree) + { + yaffs_FreeObject(obj); + } +} + +#endif + + + +static void yaffs_DeinitialiseObjects(yaffs_Device *dev) +{ + // Free the list of allocated Objects + + yaffs_ObjectList *tmp; + + while( dev->allocatedObjectList) + { + tmp = dev->allocatedObjectList->next; + YFREE(dev->allocatedObjectList->objects); + YFREE(dev->allocatedObjectList); + + dev->allocatedObjectList = tmp; + } + + 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(i && 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 + if(i) + { + in = list_entry(i, yaffs_Object,hashLink); + if(in->objectId == number) + { +#ifdef __KERNEL__ + // Don't tell the VFS about this if it has been marked for freeing + if(in->deferedFree) + return NULL; +#endif + 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->yst_atime = theObject->yst_mtime = theObject->yst_ctime = Y_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->yst_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[1]; + +#else + + in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME; + in->yst_rdev = rdev; + in->yst_uid = uid; + in->yst_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_AbortHalfCreatedObject(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_SPECIAL,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_CASE_INSENSITIVE + // 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)); + // Set up dynamic blockinfo stuff. + dev->chunkBitmapStride = (dev->nChunksPerBlock+7)/8; + dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks); + if(dev->blockInfo && dev->chunkBits) + { + memset(dev->blockInfo,0,nBlocks * sizeof(yaffs_BlockInfo)); + memset(dev->chunkBits,0,dev->chunkBitmapStride * nBlocks); + return YAFFS_OK; + } + + return YAFFS_FAIL; + +} + +static void yaffs_DeinitialiseBlocks(yaffs_Device *dev) +{ + YFREE(dev->blockInfo); + dev->blockInfo = NULL; + YFREE(dev->chunkBits); + dev->chunkBits = NULL; +} + +// FindDiretiestBlock is used to select the dirtiest block (or close enough) +// for garbage collection. + +static int yaffs_FindDirtiestBlock(yaffs_Device *dev,int aggressive) +{ + + int b = dev->currentDirtyChecker; + + int i; + int iterations; + int dirtiest = -1; + int pagesInUse; + yaffs_BlockInfo *bi; + + // If we're doing aggressive GC then we are happy to take a less-dirty block, and + // search further. + + pagesInUse = (aggressive)? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1; + if(aggressive) + { + iterations = dev->internalEndBlock - dev->internalStartBlock + 1; + } + else + { + iterations = dev->internalEndBlock - dev->internalStartBlock + 1; + iterations = iterations / 16; + if(iterations > 200) + { + iterations = 200; + } + } + + for(i = 0; i <= iterations && pagesInUse > 0 ; i++) + { + b++; + if ( b < dev->internalStartBlock || b > dev->internalEndBlock) + { + b = dev->internalStartBlock; + } + + if(b < dev->internalStartBlock || b > dev->internalEndBlock) + { + 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 - bi->softDeletions )< pagesInUse) + { + dirtiest = b; + pagesInUse = (bi->pagesInUse - bi->softDeletions); + } + } + + 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 ) + { + // Clean it up... + bi->blockState = YAFFS_BLOCK_STATE_EMPTY; + dev->nErasedBlocks++; + bi->pagesInUse = 0; + bi->softDeletions = 0; + yaffs_ClearChunkBits(dev,blockNo); + + 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 tragedy: no space during gc" TENDSTR))); + + return -1; + } + + // Find an empty block. + + for(i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) + { + dev->allocationBlockFinder++; + if(dev->allocationBlockFinder internalStartBlock || dev->allocationBlockFinder> dev->internalEndBlock) + { + dev->allocationBlockFinder = dev->internalStartBlock; + } + + bi = yaffs_GetBlockInfo(dev,dev->allocationBlockFinder); + + if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY) + { + bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING; + dev->nErasedBlocks--; + return dev->allocationBlockFinder; + } + } + + 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 <= dev->nReservedBlocks) + { + // 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 * dev->nChunksPerBlock) + + dev->allocationPage; + bi->pagesInUse++; + yaffs_SetChunkBit(dev,dev->allocationBlock,dev->allocationPage); + + dev->allocationPage++; + + dev->nFreeChunks--; + + // If the block is full set the state to full + if(dev->allocationPage >= dev->nChunksPerBlock) + { + 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. + +static int yaffs_CheckSpaceForChunkCache(yaffs_Device *dev) +{ + return (dev->nErasedBlocks >= dev->nReservedBlocks); +} + + +static int yaffs_GarbageCollectBlock(yaffs_Device *dev,int block) +{ + int oldChunk; + int newChunk; + int chunkInBlock; + int markNAND; + + + 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(chunkInBlock = 0,oldChunk = block * dev->nChunksPerBlock; + chunkInBlock < dev->nChunksPerBlock && yaffs_StillSomeChunkBits(dev,block); + chunkInBlock++, oldChunk++ ) + { + if(yaffs_CheckChunkBit(dev,block,chunkInBlock)) + { + + // This page is in use and might need to be copied off + + markNAND = 1; + + //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--; + + if(object->nDataChunks <= 0) + { + // Time to delete the file too + yaffs_FreeTnode(object->myDev,object->variant.fileVariant.top); + object->variant.fileVariant.top = NULL; + T(YAFFS_TRACE_TRACING,(TSTR("yaffs: About to finally delete object %d" TENDSTR),object->objectId)); + yaffs_DoGenericObjectDeletion(object); + } + markNAND = 0; + } + else if( 0 /* Todo object && object->deleted && object->nDataChunks == 0 */) + { + // Deleted object header with no data chunks. + // Can be discarded and the file deleted. + object->chunkId = 0; + yaffs_FreeTnode(object->myDev,object->variant.fileVariant.top); + object->variant.fileVariant.top = NULL; + yaffs_DoGenericObjectDeletion(object); + + } + 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); + + dev->nGCCopies++; + + 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; + object->serial = tags.serialNumber; + } + else + { + // It's a data chunk + yaffs_PutChunkIntoFile(object, tags.chunkId, newChunk,0); + } + } + + yaffs_DeleteChunk(dev,oldChunk,markNAND); + + } + } + + return YAFFS_OK; +} + + +static yaffs_Object *yaffs_FindDeletedUnlinkedFile(yaffs_Device *dev) +{ + // find a file to delete + struct list_head *i; + yaffs_Object *l; + + + //Scan the unlinked files looking for one to delete + list_for_each(i,&dev->unlinkedDir->variant.directoryVariant.children) + { + if(i) + { + 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 = -1; + + 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); + obj->variant.fileVariant.top = NULL; + yaffs_DoGenericObjectDeletion(obj); + dev->nDeletedFiles--; + dev->nUnlinkedFiles--; + dev->nBackgroundDeletions++; + dev->unlinkedDeletion = NULL; + } + } +} + + +#if 0 +#define YAFFS_GARBAGE_COLLECT_LOW_WATER 2 +static int yaffs_CheckGarbageCollection(yaffs_Device *dev) +{ + int block; + int aggressive=0; + + //yaffs_DoUnlinkedFileDeletion(dev); + + if(dev->nErasedBlocks <= (dev->nReservedBlocks + YAFFS_GARBAGE_COLLECT_LOW_WATER)) + { + aggressive = 1; + } + + if(aggressive) + { + block = yaffs_FindDirtiestBlock(dev,aggressive); + + if(block >= 0) + { + dev->garbageCollections++; + return yaffs_GarbageCollectBlock(dev,block); + } + else + { + return YAFFS_FAIL; + } + } + + return YAFFS_OK; +} +#endif + +// New garbage collector +// If we're very low on erased blocks then we do aggressive garbage collection +// otherwise we do "passive" garbage collection. +// Aggressive gc looks further (whole array) and will accept dirtier blocks. +// Passive gc only inspects smaller areas and will only accept cleaner blocks. +// +// The idea is to help clear out space in a more spread-out manner. +// Dunno if it really does anything useful. +// +static int yaffs_CheckGarbageCollection(yaffs_Device *dev) +{ + int block; + int aggressive=0; + + //yaffs_DoUnlinkedFileDeletion(dev); + + if(dev->nErasedBlocks <= (dev->nReservedBlocks + 1)) + { + aggressive = 1; + } + + block = yaffs_FindDirtiestBlock(dev,aggressive); + + if(block >= 0) + { + dev->garbageCollections++; + if(!aggressive) + { + dev->passiveGarbageCollections++; + } + + T(YAFFS_TRACE_GC,(TSTR("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),dev->nErasedBlocks,aggressive)); + + return yaffs_GarbageCollectBlock(dev,block); + } + + return aggressive ? YAFFS_FAIL : 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); + + if(!dev->useNANDECC && buffer) + { + yaffs_CalcECC(buffer,&spare); + } + + 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); + + if(!dev->useNANDECC && buffer) + { + yaffs_CalcECC(buffer,&spare); + } + + 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 + in->myDev->nBytesPerChunk -1)/in->myDev->nBytesPerChunk; + + 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 tragedy: 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,1); + } + else + { + // Use existing. + // Delete the new one and return early so that the tnode isn't changed + yaffs_DeleteChunk(dev,chunkInNAND,1); + 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 + { + memset(buffer,0,YAFFS_BYTES_PER_CHUNK); + return 0; + } + +} + + +static void yaffs_DeleteChunk(yaffs_Device *dev,int chunkId,int markNAND) +{ + int block; + int page; + yaffs_Spare spare; + yaffs_BlockInfo *bi; + + if(chunkId <= 0) return; + + dev->nDeletions++; + block = chunkId / dev->nChunksPerBlock; + page = chunkId % dev->nChunksPerBlock; + + if(markNAND) + { + yaffs_SpareInitialise(&spare); + +#ifdef CONFIG_MTD_NAND_VERIFY_WRITE + + //read data before write, to ensure correct ecc + //if we're using MTD verification under Linux + yaffs_ReadChunkFromNAND(dev,chunkId,NULL,&spare,0); +#endif + + spare.pageStatus = 0; // To mark it as deleted. + + + yaffs_WriteChunkToNAND(dev,chunkId,NULL,&spare); + yaffs_HandleUpdateChunk(dev,chunkId,&spare); + } + else + { + dev->nUnmarkedDeletions++; + } + + 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++; + + yaffs_ClearChunkBit(dev,block,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,1); + + } + + 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->yst_mode = in->yst_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->yst_uid = in->yst_uid; + oh->yst_gid = in->yst_gid; + oh->yst_atime = in->yst_atime; + oh->yst_mtime = in->yst_mtime; + oh->yst_ctime = in->yst_ctime; + oh->yst_rdev = in->yst_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, (prevChunkId >= 0) ? 1 : 0 ); + + if(newChunkId >= 0) + { + + in->chunkId = newChunkId; + + if(prevChunkId >= 0) + { + yaffs_DeleteChunk(dev,prevChunkId,1); + } + + 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. + + + + + +static void yaffs_FlushFilesChunkCache(yaffs_Object *obj) +{ + yaffs_Device *dev = obj->myDev; + int lowest; + int i; + yaffs_ChunkCache *cache; + int chunkWritten = 0; + int nBytes; + int nCaches = obj->myDev->nShortOpCaches; + + if (nCaches > 0) + { + do{ + cache = NULL; + + // Find the dirty cache for this object with the lowest chunk id. + for(i = 0; i < nCaches; 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 + +#if 0 + nBytes = cache->object->variant.fileVariant.fileSize - ((cache->chunkId -1) * YAFFS_BYTES_PER_CHUNK); + + if(nBytes > YAFFS_BYTES_PER_CHUNK) + { + nBytes= YAFFS_BYTES_PER_CHUNK; + } +#endif + chunkWritten = yaffs_WriteChunkDataToObject(cache->object, + cache->chunkId, + cache->data, + cache->nBytes,1); + + cache->dirty = 0; + cache->object = NULL; + } + + } while(cache && chunkWritten > 0); + + if(cache) + { + //Hoosterman, disk full while writing cache out. + T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: no space during cache 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; + + if(dev->nShortOpCaches > 0) + { + for(i = 0; i < dev->nShortOpCaches; i++) + { + if(!dev->srCache[i].object) + { + //T(("Grabbing empty %d\n",i)); + + //printf("Grabbing empty %d\n",i); + + return &dev->srCache[i]; + } + } + + return NULL; + + theOne = -1; + usage = 0; // just to stop the compiler grizzling + + for(i = 0; i < dev->nShortOpCaches; 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)); + + //if(theOne >= 0) printf("Grabbed non-empty cache %d\n",theOne); + + return theOne >= 0 ? &dev->srCache[theOne] : NULL; + } + else + { + return NULL; + } + +} + + +static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev) +{ + yaffs_ChunkCache *cache; + yaffs_Object *theObj; + int usage; + int i; + int pushout; + + if(dev->nShortOpCaches > 0) + { + // 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; + cache = &dev->srCache[0]; + pushout = 0; + + for(i = 1; i < dev->nShortOpCaches; i++) + { + if( dev->srCache[i].object && + dev->srCache[i].lastUse < usage) + { + usage = dev->srCache[i].lastUse; + theObj = dev->srCache[i].object; + cache = &dev->srCache[i]; + pushout = i; + } + } + + if(!cache || cache->dirty) + { + + //printf("Dirty "); + yaffs_FlushFilesChunkCache(theObj); + + // Try again + cache = yaffs_GrabChunkCacheWorker(dev); + } + else + { + //printf(" pushout %d\n",pushout); + } + + } + + return cache; + } + else + return NULL; + +} + + +// Find a cached chunk +static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj, int chunkId) +{ + yaffs_Device *dev = obj->myDev; + int i; + if(dev->nShortOpCaches > 0) + { + for(i = 0; i < dev->nShortOpCaches; 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->nShortOpCaches > 0) + { + if( dev->srLastUse < 0 || + dev->srLastUse > 100000000) + { + // Reset the cache usages + int i; + for(i = 1; i < dev->nShortOpCaches; 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) +{ + if(object->myDev->nShortOpCaches > 0) + { + 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; + + if(dev->nShortOpCaches > 0) + { + // Now invalidate it. + for(i = 0; i < dev->nShortOpCaches; i++) + { + if(dev->srCache[i].object == in) + { + dev->srCache[i].object = NULL; + } + } + } +} + + + + + +///////////////////////// 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_ChunkCache *cache; + + 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; + } + + cache = yaffs_FindChunkCache(in,chunk); + + // If the chunk is already in the cache or it is less than a whole chunk + // then use the cache (if there is caching) + // else bypass the cache. + if( cache || nToCopy != YAFFS_BYTES_PER_CHUNK) + { + if(dev->nShortOpCaches > 0) + { + + // If we can't find the data in the cache, then load it up. + + if(!cache) + { + cache = yaffs_GrabChunkCache(in->myDev); + cache->object = in; + cache->chunkId = chunk; + cache->dirty = 0; + yaffs_ReadChunkDataFromObject(in,chunk,cache->data); + cache->nBytes = 0; + } + + 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); + } + + } + 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) + if(dev->nShortOpCaches > 0) + { + 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); + cache->nBytes = nToWriteBack; + } + 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)); + } + + } + 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 < (dev->internalStartBlock * dev->nChunksPerBlock) || + chunkId >= ((dev->internalEndBlock+1) * dev->nChunksPerBlock)) + { + //T(("Found daft chunkId %d for %d\n",chunkId,i)); + } + else + { + in->nDataChunks--; + yaffs_DeleteChunk(dev,chunkId,1); + } + } + + + if(sizeOfPartialChunk != 0) + { + int lastChunk = 1+ newSize/YAFFS_BYTES_PER_CHUNK; + + // Got to read and rewrite the last chunk with its new size. + // NB Got to zero pad to nuke old data + yaffs_ReadChunkDataFromObject(in,lastChunk,dev->localBuffer); + memset(dev->localBuffer + sizeOfPartialChunk,0, YAFFS_BYTES_PER_CHUNK - sizeOfPartialChunk); + + 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 updateTime) +{ + int retVal; + if(in->dirty) + { + //T(("flushing object header\n")); + + yaffs_FlushFilesChunkCache(in); + if(updateTime) + { +#ifdef CONFIG_YAFFS_WINCE + yfsd_WinFileTimeNow(in->win_mtime); +#else + in->yst_mtime = Y_CURRENT_TIME; +#endif + } + + retVal = (yaffs_UpdateObjectHeader(in,NULL,0) >= 0)? YAFFS_OK : YAFFS_FAIL; + } + 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,1); + in->chunkId = -1; +#if 0 +#ifdef __KERNEL__ + if(in->myInode) + { + in->myInode->u.generic_ip = NULL; + in->myInode = NULL; + } +#endif +#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(1 || // Ignore the result of the change name. This will only fail + // if the disk was completely full (an error condition) + // We ignore the error so we can delete files to recover the disk + retVal == YAFFS_OK) + { + //in->unlinked = 1; + //in->myDev->nUnlinkedFiles++; + //in->renameAllowed = 0; +#ifdef __KERNEL__ + if(!in->myInode) + { + // Might be open at present, + // Caught by delete_inode in yaffs_fs.c + immediateDeletion = 1; + + } +#else + 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++; + yaffs_SoftDeleteFile(in); + } + + } + return retVal; + + +#endif +} + +int yaffs_DeleteFile(yaffs_Object *in) +{ + int retVal = YAFFS_OK; + + if(in->nDataChunks > 0) + { + // Use soft deletion + if(!in->unlinked) + { + retVal = yaffs_UnlinkFile(in); + } + if(retVal == YAFFS_OK && + in->unlinked && + !in->deleted) + { + in->deleted = 1; + in->myDev->nDeletedFiles++; + yaffs_SoftDeleteFile(in); + } + return in->deleted ? YAFFS_OK : YAFFS_FAIL; + } + else + { + // The file has no data chunks so we toss it immediately + yaffs_FreeTnode(in->myDev,in->variant.fileVariant.top); + in->variant.fileVariant.top = NULL; + yaffs_DoGenericObjectDeletion(in); + + return YAFFS_OK; + } +} + +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 void yaffs_AbortHalfCreatedObject(yaffs_Object *obj) +{ + switch(obj->variantType) + { + case YAFFS_OBJECT_TYPE_FILE: yaffs_DeleteFile(obj); break; + case YAFFS_OBJECT_TYPE_DIRECTORY: yaffs_DeleteDirectory(obj); break; + case YAFFS_OBJECT_TYPE_SYMLINK: yaffs_DeleteSymLink(obj); break; + case YAFFS_OBJECT_TYPE_HARDLINK: yaffs_DeleteHardLink(obj); break; + case YAFFS_OBJECT_TYPE_SPECIAL: yaffs_DoGenericObjectDeletion(obj); break; + case YAFFS_OBJECT_TYPE_UNKNOWN: break; // should not happen. + } +} + + +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_SPECIAL: + return yaffs_DoGenericObjectDeletion(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 * dev->nChunksPerBlock,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 * dev->nChunksPerBlock + 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->internalStartBlock; blk <= dev->internalEndBlock; blk++) + { + deleted = 0; + bi = yaffs_GetBlockInfo(dev,blk); + yaffs_ClearChunkBits(dev,blk); + bi->pagesInUse = 0; + bi->softDeletions = 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 < dev->nChunksPerBlock && + state == YAFFS_BLOCK_STATE_SCANNING; c++) + { + // Read the spare area and decide what to do + chunk = blk * dev->nChunksPerBlock + 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 += (dev->nChunksPerBlock - c); + } + else if(tags.chunkId > 0) + { + int endpos; + // A data chunk. + yaffs_SetChunkBit(dev,blk,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 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 + yaffs_SetChunkBit(dev,blk,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,1); + in->valid = 0; + } + else + { + // Use existing - destroy this one. + yaffs_DeleteChunk(dev,chunk,1); + } + } + + 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->yst_mode = oh->yst_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->yst_uid = oh->yst_uid; + in->yst_gid = oh->yst_gid; + in->yst_atime = oh->yst_atime; + in->yst_mtime = oh->yst_mtime; + in->yst_ctime = oh->yst_ctime; + in->yst_rdev = oh->yst_rdev; +#endif + in->chunkId = chunk; + + } + else if(!in->valid) + { + // we need to load this info + + in->valid = 1; + in->variantType = oh->type; + + in->yst_mode = oh->yst_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->yst_uid = oh->yst_uid; + in->yst_gid = oh->yst_gid; + in->yst_atime = oh->yst_atime; + in->yst_mtime = oh->yst_mtime; + in->yst_ctime = oh->yst_ctime; + in->yst_rdev = oh->yst_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 + + T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found." TENDSTR))); + parent = dev->lostNFoundDir; + + } + + 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; + in->hardLinks.next = (struct list_head *)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); + + } + + } + + { + struct list_head *i; + struct list_head *n; + + yaffs_Object *l; + // Soft delete all the unlinked files + list_for_each_safe(i,n,&dev->unlinkedDir->variant.directoryVariant.children) + { + if(i) + { + l = list_entry(i, yaffs_Object,siblings); + if(l->deleted) + { + yaffs_SoftDeleteFile(l); + } + } + } + } + + + 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) + { + if(i) + { + 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) + { + if(i) + { + l = list_entry(i, yaffs_Object,siblings); + if(l && !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->yst_mode)) return DT_FIFO; + if(S_ISCHR(obj->yst_mode)) return DT_CHR; + if(S_ISBLK(obj->yst_mode)) return DT_BLK; + if(S_ISSOCK(obj->yst_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->yst_mode = attr->ia_mode; + if(valid & ATTR_UID) obj->yst_uid = attr->ia_uid; + if(valid & ATTR_GID) obj->yst_gid = attr->ia_gid; + + if(valid & ATTR_ATIME) obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime); + if(valid & ATTR_CTIME) obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime); + if(valid & ATTR_MTIME) obj->yst_mtime = Y_TIME_CONVERT(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->yst_mode; valid |= ATTR_MODE; + attr->ia_uid = obj->yst_uid; valid |= ATTR_UID; + attr->ia_gid = obj->yst_gid; valid |= ATTR_GID; + + + Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime; valid |= ATTR_ATIME; + Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime; valid |= ATTR_CTIME; + Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_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( dev->nBytesPerChunk != YAFFS_BYTES_PER_CHUNK || + dev->nChunksPerBlock < 2 || + dev->nReservedBlocks < 2 || + dev->startBlock < 0 || + dev->endBlock <= 0 || + dev->endBlock <= (dev->startBlock + dev->nReservedBlocks) + ) + { + //these parameters must be set before stating yaffs + // Other parameters internalStartBlock, + return YAFFS_FAIL; + } + + + + if(!yaffs_CheckStructures()) + { + T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs_CheckStructures failed\n" TENDSTR))); + return YAFFS_FAIL; + } + + if(dev->isMounted) + { + T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: device already mounted\n" TENDSTR))); + return YAFFS_FAIL; + } + + dev->isMounted = 1; + + 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; + } + + + // Do we need to add an offset to use block 0? + + dev->internalStartBlock = dev->startBlock; + dev->internalEndBlock = dev->endBlock; + dev->blockOffset = 0; + dev->chunkOffset = 0; + + if(dev->startBlock == 0) + { + dev->internalStartBlock++; + dev->internalEndBlock++; + dev->blockOffset++; + dev->chunkOffset = dev->nChunksPerBlock; + } + + + nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1; + + + + // OK now calculate a few things for the device + // Calculate chunkGroupBits. + // We need to find the next power of 2 > than internalEndBlock + + x = dev->nChunksPerBlock * (dev->internalEndBlock+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; + + if(dev->nChunksPerBlock < dev->chunkGroupSize) + { + // We have a problem because the soft delete won't work if + // the chunk group size > chunks per block. + // This can be remedied by using larger "virtual blocks". + + return YAFFS_FAIL; + } + + + + + // More device initialisation + dev->garbageCollections = 0; + dev->passiveGarbageCollections = 0; + dev->currentDirtyChecker = 0; + dev->bufferedBlock = -1; + dev->doingBufferedBlockRewrite = 0; + dev->nDeletedFiles = 0; + dev->nBackgroundDeletions=0; + dev->nUnlinkedFiles = 0; + dev->eccFixed=0; + dev->eccUnfixed=0; + dev->tagsEccFixed=0; + dev->tagsEccUnfixed=0; + dev->nErasedBlocks=0; + + dev->localBuffer = YMALLOC(dev->nBytesPerChunk); + + + + + yaffs_InitialiseBlocks(dev,nBlocks); + + yaffs_InitialiseTnodes(dev); + + yaffs_InitialiseObjects(dev); + + if(dev->nShortOpCaches > 0) + { + int i; + + if(dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES) + { + dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES; + } + + dev->srCache = YMALLOC( dev->nShortOpCaches * sizeof(yaffs_ChunkCache)); + + for(i=0; i < dev->nShortOpCaches; i++) + { + dev->srCache[i].object = NULL; + dev->srCache[i].lastUse = 0; + dev->srCache[i].dirty = 0; + } + dev->srLastUse = 0; + } + + 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) +{ + if(dev->isMounted) + { + + yaffs_DeinitialiseBlocks(dev); + yaffs_DeinitialiseTnodes(dev); + yaffs_DeinitialiseObjects(dev); + if(dev->nShortOpCaches > 0) + YFREE(dev->srCache); + YFREE(dev->localBuffer); + dev->isMounted = 0; + } + +} + +#if 0 + +int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev) +{ + int nFree = dev->nFreeChunks - (dev->nChunksPerBlock * 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; + } + } + + + // printf("___________ nFreeChunks is %d nFree is %d\n",dev->nFreeChunks,nFree); + + if(nFree < 0) nFree = 0; + + return nFree; + +} + +#endif + +int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev) +{ + int nFree; + int pending; + int b; + int nDirtyCacheChunks=0; + + yaffs_BlockInfo *blk; + + struct list_head *i; + yaffs_Object *l; + + for(nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock; b++) + { + blk = yaffs_GetBlockInfo(dev,b); + + switch(blk->blockState) + { + case YAFFS_BLOCK_STATE_EMPTY: + case YAFFS_BLOCK_STATE_ALLOCATING: + case YAFFS_BLOCK_STATE_FULL: nFree += (dev->nChunksPerBlock - blk->pagesInUse); break; + default: break; + } + } + + + pending = 0; + + // To the free chunks add the chunks that are in the deleted unlinked files. + list_for_each(i,&dev->unlinkedDir->variant.directoryVariant.children) + { + if(i) + { + l = list_entry(i, yaffs_Object,siblings); + if(l->deleted) + { + pending++; + pending += l->nDataChunks; + } + } + } + + + + //printf("___________ really free is %d, pending %d, nFree is %d\n",nFree,pending, nFree+pending); + + if(nFree != dev->nFreeChunks) + { + // printf("___________Different! really free is %d, nFreeChunks %d\n",nFree dev->nFreeChunks); + } + + nFree += pending; + + // Now count the number of dirty chunks in the cache and subtract those + + { + int i; + for(i = 0; i < dev->nShortOpCaches; i++) + { + if(dev->srCache[i].dirty) nDirtyCacheChunks++; + } + } + + nFree -= nDirtyCacheChunks; + + nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock); + + if(nFree < 0) nFree = 0; + + return 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") +#ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG + yaffs_CheckStruct(yaffs_Tnode,2* YAFFS_NTNODES_LEVEL0,"yaffs_Tnode") +#endif + 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 + + + + + + +