3 * YAFFS: Yet another FFS. A NAND-flash specific file system.
5 * Copyright (C) 2002 Aleph One Ltd.
6 * for Toby Churchill Ltd and Brightstar Engineering
8 * Created by Charles Manning <charles@aleph1.co.uk>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
17 const char *yaffs_guts_c_version="$Id: yaffs_guts.c,v 1.5 2005-03-16 04:00:36 charles Exp $";
21 #include "yaffsinterface.h"
22 #include "yaffs_guts.h"
24 #include "yaffs_tagscompat.h"
26 #ifdef CONFIG_YAFFS_WINCE
27 void yfsd_LockYAFFS(BOOL fsLockOnly);
28 void yfsd_UnlockYAFFS(BOOL fsLockOnly);
31 #define YAFFS_PASSIVE_GC_CHUNKS 2
34 // Use Steven Hill's ECC struff instead
35 // External functions for ECC on data
36 void nand_calculate_ecc (const u_char *dat, u_char *ecc_code);
37 int nand_correct_data (u_char *dat, u_char *read_ecc, u_char *calc_ecc);
38 #define yaffs_ECCCalculate(data,ecc) nand_calculate_ecc(data,ecc)
39 #define yaffs_ECCCorrect(data,read_ecc,calc_ecc) nand_correct_ecc(data,read_ecc,calc_ecc)
41 #include "yaffs_ecc.h"
44 // countBits is a quick way of counting the number of bits in a byte.
45 // ie. countBits[n] holds the number of 1 bits in a byte with the value n.
47 static const char yaffs_countBitsTable[256] =
49 0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4,
50 1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
51 1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
52 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
53 1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
54 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
55 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
56 3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
57 1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
58 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
59 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
60 3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
61 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
62 3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
63 3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
64 4,5,5,6,5,6,6,7,5,6,6,7,6,7,7,8
67 static int yaffs_CountBits(__u8 x)
70 retVal = yaffs_countBitsTable[x];
76 // Stuff using yea olde tags
77 static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr);
78 static void yaffs_GetTagsFromSpare(yaffs_Device *dev, yaffs_Spare *sparePtr,yaffs_Tags *tagsPtr);
80 static int yaffs_ReadChunkTagsFromNAND(yaffs_Device *dev,int chunkInNAND, yaffs_Tags *tags, int *chunkDeleted);
81 static int yaffs_TagsMatch(const yaffs_Tags *tags, int objectId, int chunkInObject, int chunkDeleted);
88 static Y_INLINE int yaffs_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *buffer, yaffs_ExtendedTags *tags);
89 static Y_INLINE int yaffs_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND, const __u8 *data, yaffs_ExtendedTags *tags);
90 static Y_INLINE int yaffs_MarkBlockBad(yaffs_Device *dev, int blockNo);
91 static Y_INLINE int yaffs_QueryInitialBlockState(yaffs_Device *dev,int blockNo, yaffs_BlockState *state,unsigned *sequenceNumber);
93 static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev, const __u8 *buffer, yaffs_ExtendedTags *tags, int useReserve);
94 static int yaffs_CheckObjectHashSanity(yaffs_Device *dev);
95 static int yaffs_PutChunkIntoFile(yaffs_Object *in,int chunkInInode, int chunkInNAND, int inScan);
97 static yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev,int number,yaffs_ObjectType type);
98 static void yaffs_AddObjectToDirectory(yaffs_Object *directory, yaffs_Object *obj);
99 static int yaffs_UpdateObjectHeader(yaffs_Object *in,const YCHAR *name, int force,int isShrink);
100 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj);
101 static int yaffs_CheckStructures(void);
102 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, int chunkOffset,int *limit);
103 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in);
105 static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device *dev,int blockNo);
107 static __u8 *yaffs_GetTempBuffer(yaffs_Device *dev,int lineNo);
108 static void yaffs_ReleaseTempBuffer(yaffs_Device *dev, __u8 *buffer, int lineNo);
111 static int yaffs_ValidateTags(yaffs_ExtendedTags *tags);
113 // Robustification (if it ever comes about...)
114 static void yaffs_RetireBlock(yaffs_Device *dev,int blockInNAND);
115 static void yaffs_HandleReadDataError(yaffs_Device *dev,int chunkInNAND);
116 static void yaffs_HandleWriteChunkError(yaffs_Device *dev,int chunkInNAND);
117 static void yaffs_HandleWriteChunkOk(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_ExtendedTags *tags);
118 static void yaffs_HandleUpdateChunk(yaffs_Device *dev,int chunkInNAND, const yaffs_ExtendedTags *tags);
120 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,int chunkInNAND);
122 static int yaffs_UnlinkWorker(yaffs_Object *obj);
123 static void yaffs_DestroyObject(yaffs_Object *obj);
126 static int yaffs_VerifyCompare(const __u8 *d0, const __u8 * d1, const yaffs_Spare *s0, const yaffs_Spare *s1,int dataSize);
129 static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId, int chunkInObject);
132 loff_t yaffs_GetFileSize(yaffs_Object *obj);
135 static int yaffs_AllocateChunk(yaffs_Device *dev,int useReserve);
137 #ifdef YAFFS_PARANOID
138 static int yaffs_CheckFileSanity(yaffs_Object *in);
140 #define yaffs_CheckFileSanity(in)
143 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in);
144 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId);
146 static int yaffs_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *buffer, yaffs_ExtendedTags *tags)
148 if(dev->readChunkWithTagsFromNAND)
149 return dev->readChunkWithTagsFromNAND(dev,chunkInNAND,buffer,tags);
151 return yaffs_TagsCompatabilityReadChunkWithTagsFromNAND(dev,chunkInNAND,buffer,tags);
154 static Y_INLINE int yaffs_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND, const __u8 *buffer, yaffs_ExtendedTags *tags)
158 tags->sequenceNumber = dev->sequenceNumber;
160 if(!yaffs_ValidateTags(tags))
162 T(YAFFS_TRACE_ERROR,(TSTR("Writing uninitialised tags" TENDSTR)));
165 T(YAFFS_TRACE_WRITE,(TSTR("Writing chunk %d tags %d %d"TENDSTR),chunkInNAND,tags->objectId,tags->chunkId));
169 T(YAFFS_TRACE_ERROR,(TSTR("Writing with no tags" TENDSTR)));
173 if(dev->writeChunkWithTagsToNAND)
174 return dev->writeChunkWithTagsToNAND(dev,chunkInNAND,buffer,tags);
176 return yaffs_TagsCompatabilityWriteChunkWithTagsToNAND(dev,chunkInNAND,buffer,tags);
179 static Y_INLINE int yaffs_MarkBlockBad(yaffs_Device *dev, int blockNo)
181 if(dev->markNANDBlockBad)
182 return dev->markNANDBlockBad(dev,blockNo);
184 return yaffs_TagsCompatabilityMarkNANDBlockBad(dev,blockNo);
186 static Y_INLINE int yaffs_QueryInitialBlockState(yaffs_Device *dev,int blockNo, yaffs_BlockState *state, unsigned *sequenceNumber)
188 if(dev->queryNANDBlock)
189 return dev->queryNANDBlock(dev,blockNo,state,sequenceNumber);
191 return yaffs_TagsCompatabilityQueryNANDBlock(dev,blockNo,state,sequenceNumber);
194 int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,int blockInNAND)
198 dev->nBlockErasures++;
199 result = dev->eraseBlockInNAND(dev,blockInNAND);
201 if(!result)result = dev->eraseBlockInNAND(dev,blockInNAND); // If at first we don't succeed, try again *once*.
205 static int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev)
207 return dev->initialiseNAND(dev);
213 // Temporary buffer manipulations
215 static __u8 *yaffs_GetTempBuffer(yaffs_Device *dev,int lineNo)
218 for(i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
220 if(dev->tempBuffer[i].line == 0)
222 dev->tempBuffer[i].line = lineNo;
223 if((i+1) > dev->maxTemp)
225 dev->maxTemp = i + 1;
226 for(j = 0; j <= i; j++)
227 dev->tempBuffer[j].maxLine = dev->tempBuffer[j].line;
230 return dev->tempBuffer[i].buffer;
234 T(YAFFS_TRACE_BUFFERS,(TSTR("Out of temp buffers at line %d, other held by lines:"),lineNo));
235 for(i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
237 T(YAFFS_TRACE_BUFFERS,(TSTR(" %d "),dev->tempBuffer[i].line));
239 T(YAFFS_TRACE_BUFFERS,(TSTR(" "TENDSTR)));
241 dev->unmanagedTempAllocations++;
242 // Get an unmanaged one
243 return YMALLOC(dev->nBytesPerChunk);
248 static void yaffs_ReleaseTempBuffer(yaffs_Device *dev, __u8 *buffer, int lineNo)
251 for(i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
253 if(dev->tempBuffer[i].buffer == buffer)
255 dev->tempBuffer[i].line = 0;
262 // assume it is an unmanaged one.
263 T(YAFFS_TRACE_BUFFERS,(TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),lineNo));
265 dev->unmanagedTempDeallocations++;
271 // Chunk bitmap manipulations
273 static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device *dev, int blk)
275 if(blk < dev->startBlock || blk > dev->endBlock)
277 T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),blk));
280 return dev->chunkBits + (dev->chunkBitmapStride * (blk - dev->startBlock));
283 static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device *dev,int blk)
285 __u8 *blkBits = yaffs_BlockBits(dev,blk);
287 memset(blkBits,0,dev->chunkBitmapStride);
290 static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device *dev,int blk,int chunk)
292 __u8 *blkBits = yaffs_BlockBits(dev,blk);
294 blkBits[chunk/8] &= ~ (1<<(chunk & 7));
297 static Y_INLINE void yaffs_SetChunkBit(yaffs_Device *dev,int blk,int chunk)
299 __u8 *blkBits = yaffs_BlockBits(dev,blk);
301 blkBits[chunk/8] |= (1<<(chunk & 7));
304 static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device *dev,int blk,int chunk)
306 __u8 *blkBits = yaffs_BlockBits(dev,blk);
307 return (blkBits[chunk/8] & (1<<(chunk & 7))) ? 1 :0;
310 static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device *dev,int blk)
312 __u8 *blkBits = yaffs_BlockBits(dev,blk);
314 for(i = 0; i < dev->chunkBitmapStride; i++)
316 if(*blkBits) return 1;
323 // Function to manipulate block info
324 static Y_INLINE yaffs_BlockInfo* yaffs_GetBlockInfo(yaffs_Device *dev, int blk)
326 if(blk < dev->startBlock || blk > dev->endBlock)
328 T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs: getBlockInfo block %d is not valid" TENDSTR),blk));
331 return &dev->blockInfo[blk - dev->startBlock];
336 static Y_INLINE int yaffs_HashFunction(int n)
338 return (n % YAFFS_NOBJECT_BUCKETS);
342 yaffs_Object *yaffs_Root(yaffs_Device *dev)
347 yaffs_Object *yaffs_LostNFound(yaffs_Device *dev)
349 return dev->lostNFoundDir;
353 static int yaffs_WriteChunkToNAND(struct yaffs_DeviceStruct *dev,int chunkInNAND, const __u8 *data, yaffs_Spare *spare)
355 if(chunkInNAND < dev->startBlock * dev->nChunksPerBlock)
357 T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs chunk %d is not valid" TENDSTR),chunkInNAND));
362 return dev->writeChunkToNAND(dev,chunkInNAND,data,spare);
367 static int yaffs_ReadChunkFromNAND(struct yaffs_DeviceStruct *dev,
371 int doErrorCorrection)
374 yaffs_Spare localSpare;
383 // If we don't have a real spare, then we use a local one.
384 // Need this for the calculation of the ecc
391 retVal = dev->readChunkFromNAND(dev,chunkInNAND,data,spare);
392 if(data && doErrorCorrection)
395 //Todo handle any errors
396 int eccResult1,eccResult2;
399 yaffs_ECCCalculate(data,calcEcc);
400 eccResult1 = yaffs_ECCCorrect (data,spare->ecc1, calcEcc);
401 yaffs_ECCCalculate(&data[256],calcEcc);
402 eccResult2 = yaffs_ECCCorrect(&data[256],spare->ecc2, calcEcc);
406 T(YAFFS_TRACE_ERROR, (TSTR("**>>ecc error fix performed on chunk %d:0" TENDSTR),chunkInNAND));
409 else if(eccResult1<0)
411 T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:0" TENDSTR),chunkInNAND));
417 T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error fix performed on chunk %d:1" TENDSTR),chunkInNAND));
420 else if(eccResult2<0)
422 T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:1" TENDSTR),chunkInNAND));
426 if(eccResult1 || eccResult2)
428 // Hoosterman, we had a data problem on this page
429 yaffs_HandleReadDataError(dev,chunkInNAND);
435 // Must allocate enough memory for spare+2*sizeof(int) for ecc results from device.
436 struct yaffs_NANDSpare nspare;
437 retVal = dev->readChunkFromNAND(dev,chunkInNAND,data,(yaffs_Spare*)&nspare);
438 memcpy (spare, &nspare, sizeof(yaffs_Spare));
439 if(data && doErrorCorrection)
443 T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error fix performed on chunk %d:0" TENDSTR),chunkInNAND));
445 else if(nspare.eccres1<0)
447 T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:0" TENDSTR),chunkInNAND));
452 T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error fix performed on chunk %d:1" TENDSTR),chunkInNAND));
454 else if(nspare.eccres2<0)
456 T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:1" TENDSTR),chunkInNAND));
459 if(nspare.eccres1 || nspare.eccres2)
461 // Hoosterman, we had a data problem on this page
462 yaffs_HandleReadDataError(dev,chunkInNAND);
474 int yaffs_CheckFF(__u8 *buffer,int nBytes)
476 //Horrible, slow implementation
479 if(*buffer != 0xFF) return 0;
485 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,int chunkInNAND)
488 int retval = YAFFS_OK;
489 __u8 *data = yaffs_GetTempBuffer(dev,__LINE__);
490 yaffs_ExtendedTags tags;
492 // NCB dev->readChunkWithTagsFromNAND(dev,chunkInNAND,data,&tags);
493 yaffs_ReadChunkWithTagsFromNAND(dev,chunkInNAND,data,&tags);
495 if(!yaffs_CheckFF(data,dev->nBytesPerChunk) || tags.chunkUsed)
497 T(YAFFS_TRACE_NANDACCESS,(TSTR("Chunk %d not erased" TENDSTR),chunkInNAND));
501 yaffs_ReleaseTempBuffer(dev,data,__LINE__);
510 static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev, const __u8 *data, yaffs_ExtendedTags *tags,int useReserve)
520 chunk = yaffs_AllocateChunk(dev,useReserve);
525 // First check this chunk is erased...
526 #ifndef CONFIG_YAFFS_DISABLE_CHUNK_ERASED_CHECK
527 writeOk = yaffs_CheckChunkErased(dev,chunk);
531 T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs chunk %d was not erased" TENDSTR),chunk));
535 writeOk = yaffs_WriteChunkWithTagsToNAND(dev,chunk,data,tags);
541 // Copy the data into the robustification buffer.
542 // NB We do this at the end to prevent duplicates in the case of a write error.
544 yaffs_HandleWriteChunkOk(dev,chunk,data,tags);
548 yaffs_HandleWriteChunkError(dev,chunk);
552 } while(chunk >= 0 && ! writeOk);
556 T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs write required %d attempts" TENDSTR),attempts));
557 dev->nRetriedWrites+= (attempts - 1);
568 // Functions for robustisizing
572 static void yaffs_RetireBlock(yaffs_Device *dev,int blockInNAND)
575 yaffs_MarkBlockBad(dev,blockInNAND);
577 yaffs_GetBlockInfo(dev,blockInNAND)->blockState = YAFFS_BLOCK_STATE_DEAD;
579 dev->nRetiredBlocks++;
584 static int yaffs_RewriteBufferedBlock(yaffs_Device *dev)
586 dev->doingBufferedBlockRewrite = 1;
588 // Remove erased chunks
589 // Rewrite existing chunks to a new block
590 // Set current write block to the new block
592 dev->doingBufferedBlockRewrite = 0;
598 static void yaffs_HandleReadDataError(yaffs_Device *dev,int chunkInNAND)
600 int blockInNAND = chunkInNAND/dev->nChunksPerBlock;
602 // Mark the block for retirement
603 yaffs_GetBlockInfo(dev,blockInNAND)->needsRetiring = 1;
604 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>>Block %d marked for retirement" TENDSTR),blockInNAND));
608 // Just do a garbage collection on the affected block then retire the block
613 static void yaffs_CheckWrittenBlock(yaffs_Device *dev,int chunkInNAND)
617 static void yaffs_HandleWriteChunkOk(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_ExtendedTags *tags)
621 static void yaffs_HandleUpdateChunk(yaffs_Device *dev,int chunkInNAND, const yaffs_ExtendedTags *tags)
625 static void yaffs_HandleWriteChunkError(yaffs_Device *dev,int chunkInNAND)
627 int blockInNAND = chunkInNAND/dev->nChunksPerBlock;
629 // Mark the block for retirement
630 yaffs_GetBlockInfo(dev,blockInNAND)->needsRetiring = 1;
632 yaffs_DeleteChunk(dev,chunkInNAND,1,__LINE__);
638 static int yaffs_VerifyCompare(const __u8 *d0, const __u8 * d1, const yaffs_Spare *s0, const yaffs_Spare *s1,int dataSize)
642 if( memcmp(d0,d1,dataSize) != 0 ||
643 s0->tagByte0 != s1->tagByte0 ||
644 s0->tagByte1 != s1->tagByte1 ||
645 s0->tagByte2 != s1->tagByte2 ||
646 s0->tagByte3 != s1->tagByte3 ||
647 s0->tagByte4 != s1->tagByte4 ||
648 s0->tagByte5 != s1->tagByte5 ||
649 s0->tagByte6 != s1->tagByte6 ||
650 s0->tagByte7 != s1->tagByte7 ||
651 s0->ecc1[0] != s1->ecc1[0] ||
652 s0->ecc1[1] != s1->ecc1[1] ||
653 s0->ecc1[2] != s1->ecc1[2] ||
654 s0->ecc2[0] != s1->ecc2[0] ||
655 s0->ecc2[1] != s1->ecc2[1] ||
656 s0->ecc2[2] != s1->ecc2[2] )
666 ///////////////////////// Object management //////////////////
667 // List of spare objects
668 // The list is hooked together using the first pointer
671 // static yaffs_Object *yaffs_freeObjects = NULL;
673 // static int yaffs_nFreeObjects;
675 // static yaffs_ObjectList *yaffs_allocatedObjectList = NULL;
677 // static yaffs_ObjectBucket yaffs_objectBucket[YAFFS_NOBJECT_BUCKETS];
680 static __u16 yaffs_CalcNameSum(const YCHAR *name)
685 YUCHAR *bname = (YUCHAR *)name;
688 while ((*bname) && (i <=YAFFS_MAX_NAME_LENGTH))
691 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
692 sum += yaffs_toupper(*bname) * i;
703 void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name)
705 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
706 if(name && yaffs_strlen(name) <= YAFFS_SHORT_NAME_LENGTH)
708 yaffs_strcpy(obj->shortName,name);
712 obj->shortName[0]=_Y('\0');
715 obj->sum = yaffs_CalcNameSum(name);
719 void yaffs_CalcECC(const __u8 *data, yaffs_Spare *spare)
721 yaffs_ECCCalculate(data , spare->ecc1);
722 yaffs_ECCCalculate(&data[256] , spare->ecc2);
727 ///////////////////////// TNODES ///////////////////////
729 // List of spare tnodes
730 // The list is hooked together using the first pointer
733 //static yaffs_Tnode *yaffs_freeTnodes = NULL;
735 // static int yaffs_nFreeTnodes;
737 //static yaffs_TnodeList *yaffs_allocatedTnodeList = NULL;
741 // yaffs_CreateTnodes creates a bunch more tnodes and
742 // adds them to the tnode free list.
743 // Don't use this function directly
745 static int yaffs_CreateTnodes(yaffs_Device *dev,int nTnodes)
748 yaffs_Tnode *newTnodes;
749 yaffs_TnodeList *tnl;
751 if(nTnodes < 1) return YAFFS_OK;
755 newTnodes = YMALLOC(nTnodes * sizeof(yaffs_Tnode));
759 T(YAFFS_TRACE_ERROR,(TSTR("yaffs: Could not allocate Tnodes"TENDSTR)));
763 // Hook them into the free list
764 for(i = 0; i < nTnodes - 1; i++)
766 newTnodes[i].internal[0] = &newTnodes[i+1];
767 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
768 newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = 1;
772 newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
773 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
774 newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = 1;
776 dev->freeTnodes = newTnodes;
777 dev->nFreeTnodes+= nTnodes;
778 dev->nTnodesCreated += nTnodes;
780 // Now add this bunch of tnodes to a list for freeing up.
781 // NB If we can't add this to the management list it isn't fatal
782 // but it just means we can't free this bunch of tnodes later.
783 tnl = YMALLOC(sizeof(yaffs_TnodeList));
786 T(YAFFS_TRACE_ERROR,(TSTR("yaffs: Could not add tnodes to management list" TENDSTR)));
791 tnl->tnodes = newTnodes;
792 tnl->next = dev->allocatedTnodeList;
793 dev->allocatedTnodeList = tnl;
797 T(YAFFS_TRACE_ALLOCATE,(TSTR("yaffs: Tnodes added" TENDSTR)));
804 // GetTnode gets us a clean tnode. Tries to make allocate more if we run out
805 static yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev)
807 yaffs_Tnode *tn = NULL;
809 // If there are none left make more
812 yaffs_CreateTnodes(dev,YAFFS_ALLOCATION_NTNODES);
817 tn = dev->freeTnodes;
818 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
819 if(tn->internal[YAFFS_NTNODES_INTERNAL] != 1)
821 // Hoosterman, this thing looks like it isn't in the list
822 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: Tnode list bug 1" TENDSTR)));
825 dev->freeTnodes = dev->freeTnodes->internal[0];
828 memset(tn,0,sizeof(yaffs_Tnode));
836 // FreeTnode frees up a tnode and puts it back on the free list
837 static void yaffs_FreeTnode(yaffs_Device*dev, yaffs_Tnode *tn)
841 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
842 if(tn->internal[YAFFS_NTNODES_INTERNAL] != 0)
844 // Hoosterman, this thing looks like it is already in the list
845 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: Tnode list bug 2" TENDSTR)));
847 tn->internal[YAFFS_NTNODES_INTERNAL] = 1;
849 tn->internal[0] = dev->freeTnodes;
850 dev->freeTnodes = tn;
856 static void yaffs_DeinitialiseTnodes(yaffs_Device*dev)
858 // Free the list of allocated tnodes
859 yaffs_TnodeList *tmp;
861 while(dev->allocatedTnodeList)
863 tmp = dev->allocatedTnodeList->next;
865 YFREE(dev->allocatedTnodeList->tnodes);
866 YFREE(dev->allocatedTnodeList);
867 dev->allocatedTnodeList = tmp;
871 dev->freeTnodes = NULL;
872 dev->nFreeTnodes = 0;
875 static void yaffs_InitialiseTnodes(yaffs_Device*dev)
877 dev->allocatedTnodeList = NULL;
878 dev->freeTnodes = NULL;
879 dev->nFreeTnodes = 0;
880 dev->nTnodesCreated = 0;
885 void yaffs_TnodeTest(yaffs_Device *dev)
890 yaffs_Tnode *tn[1000];
892 YINFO("Testing TNodes");
894 for(j = 0; j < 50; j++)
896 for(i = 0; i < 1000; i++)
898 tn[i] = yaffs_GetTnode(dev);
901 YALERT("Getting tnode failed");
904 for(i = 0; i < 1000; i+=3)
906 yaffs_FreeTnode(dev,tn[i]);
915 ////////////////// END OF TNODE MANIPULATION ///////////////////////////
917 /////////////// Functions to manipulate the look-up tree (made up of tnodes)
918 // The look up tree is represented by the top tnode and the number of topLevel
919 // in the tree. 0 means only the level 0 tnode is in the tree.
922 // FindLevel0Tnode finds the level 0 tnode, if one exists.
923 // Used when reading.....
924 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,yaffs_FileStructure *fStruct, __u32 chunkId)
927 yaffs_Tnode *tn = fStruct->top;
929 int requiredTallness;
930 int level = fStruct->topLevel;
932 // Check sane level and chunk Id
933 if(level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
936 // sprintf(str,"Bad level %d",level);
941 if(chunkId > YAFFS_MAX_CHUNK_ID)
944 // sprintf(str,"Bad chunkId %d",chunkId);
949 // First check we're tall enough (ie enough topLevel)
951 i = chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS);
952 requiredTallness = 0;
955 i >>= YAFFS_TNODES_INTERNAL_BITS;
960 if(requiredTallness > fStruct->topLevel)
962 // Not tall enough, so we can't find it, return NULL.
967 // Traverse down to level 0
968 while (level > 0 && tn)
970 tn = tn->internal[(chunkId >>(/* dev->chunkGroupBits + */ YAFFS_TNODES_LEVEL0_BITS + (level-1) * YAFFS_TNODES_INTERNAL_BITS)) &
971 YAFFS_TNODES_INTERNAL_MASK];
979 // AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
980 // This happens in two steps:
981 // 1. If the tree isn't tall enough, then make it taller.
982 // 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
984 // Used when modifying the tree.
986 static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev, yaffs_FileStructure *fStruct, __u32 chunkId)
991 int requiredTallness;
998 //T((TSTR("AddOrFind topLevel=%d, chunk=%d"),fStruct->topLevel,chunkId));
1000 // Check sane level and page Id
1001 if(fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL)
1004 // sprintf(str,"Bad level %d",fStruct->topLevel);
1009 if(chunkId > YAFFS_MAX_CHUNK_ID)
1012 // sprintf(str,"Bad chunkId %d",chunkId);
1017 // First check we're tall enough (ie enough topLevel)
1019 x = chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS);
1020 requiredTallness = 0;
1023 x >>= YAFFS_TNODES_INTERNAL_BITS;
1027 //T((TSTR(" required=%d"),requiredTallness));
1030 if(requiredTallness > fStruct->topLevel)
1032 // Not tall enough,gotta make the tree taller
1033 for(i = fStruct->topLevel; i < requiredTallness; i++)
1035 //T((TSTR(" add new top")));
1037 tn = yaffs_GetTnode(dev);
1041 tn->internal[0] = fStruct->top;
1046 T(YAFFS_TRACE_ERROR,(TSTR("yaffs: no more tnodes" TENDSTR)));
1050 fStruct->topLevel = requiredTallness;
1054 // Traverse down to level 0, adding anything we need
1056 l = fStruct->topLevel;
1060 x = (chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS + (l-1) * YAFFS_TNODES_INTERNAL_BITS)) &
1061 YAFFS_TNODES_INTERNAL_MASK;
1063 //T((TSTR(" [%d:%d]"),l,i));
1065 if(!tn->internal[x])
1067 //T((TSTR(" added")));
1069 tn->internal[x] = yaffs_GetTnode(dev);
1072 tn = tn->internal[x];
1083 int yaffs_FindChunkInGroup(yaffs_Device *dev, int theChunk, yaffs_ExtendedTags *tags, int objectId, int chunkInInode)
1088 for(j = 0; theChunk && j < dev->chunkGroupSize; j++)
1090 if(yaffs_CheckChunkBit(dev,theChunk / dev->nChunksPerBlock,theChunk % dev->nChunksPerBlock))
1092 yaffs_ReadChunkWithTagsFromNAND(dev,theChunk,NULL,tags);
1093 if(yaffs_TagsMatch(tags,objectId,chunkInInode))
1105 // DeleteWorker scans backwards through the tnode tree and deletes all the
1106 // chunks and tnodes in the file
1107 // Returns 1 if the tree was deleted. Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
1109 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, int chunkOffset,int *limit)
1114 yaffs_ExtendedTags tags;
1116 yaffs_Device *dev = in->myDev;
1126 for(i = YAFFS_NTNODES_INTERNAL -1; allDone && i >= 0; i--)
1130 if(limit && (*limit) < 0)
1136 allDone = yaffs_DeleteWorker(in,tn->internal[i],level - 1,
1137 (chunkOffset << YAFFS_TNODES_INTERNAL_BITS ) + i ,limit);
1141 yaffs_FreeTnode(dev,tn->internal[i]);
1142 tn->internal[i] = NULL;
1147 return (allDone) ? 1 : 0;
1153 for(i = YAFFS_NTNODES_LEVEL0 -1; i >= 0 && !hitLimit; i--)
1158 chunkInInode = (chunkOffset << YAFFS_TNODES_LEVEL0_BITS ) + i;
1160 theChunk = tn->level0[i] << dev->chunkGroupBits;
1162 foundChunk = yaffs_FindChunkInGroup(dev,theChunk,&tags,in->objectId,chunkInInode);
1166 yaffs_DeleteChunk(dev,foundChunk,1,__LINE__);
1183 return (i < 0) ? 1 : 0;
1195 static void yaffs_SoftDeleteChunk(yaffs_Device *dev, int chunk)
1198 yaffs_BlockInfo *theBlock;
1200 T(YAFFS_TRACE_DELETION,(TSTR("soft delete chunk %d" TENDSTR),chunk));
1202 theBlock = yaffs_GetBlockInfo(dev, chunk/dev->nChunksPerBlock);
1205 theBlock->softDeletions++;
1209 // SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1210 // All soft deleting does is increment the block's softdelete count and pulls the chunk out
1212 // THus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1214 static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, int chunkOffset)
1219 yaffs_Device *dev = in->myDev;
1227 for(i = YAFFS_NTNODES_INTERNAL -1; allDone && i >= 0; i--)
1231 allDone = yaffs_SoftDeleteWorker(in,tn->internal[i],level - 1,
1232 (chunkOffset << YAFFS_TNODES_INTERNAL_BITS ) + i);
1235 yaffs_FreeTnode(dev,tn->internal[i]);
1236 tn->internal[i] = NULL;
1240 //Hoosterman... how could this happen.
1244 return (allDone) ? 1 : 0;
1249 for(i = YAFFS_NTNODES_LEVEL0 -1; i >=0; i--)
1253 // Note this does not find the real chunk, only the chunk group.
1254 // We make an assumption that a chunk group is niot larger than a block.
1255 theChunk = (tn->level0[i] << dev->chunkGroupBits);
1257 yaffs_SoftDeleteChunk(dev,theChunk);
1274 static void yaffs_SoftDeleteFile(yaffs_Object *obj)
1277 obj->variantType == YAFFS_OBJECT_TYPE_FILE &&
1280 if(obj->nDataChunks <= 0)
1282 // Empty file with no duplicate object headers, just delete it immediately
1283 yaffs_FreeTnode(obj->myDev,obj->variant.fileVariant.top);
1284 obj->variant.fileVariant.top = NULL;
1285 T(YAFFS_TRACE_TRACING,(TSTR("yaffs: Deleting empty file %d" TENDSTR),obj->objectId));
1286 yaffs_DoGenericObjectDeletion(obj);
1290 yaffs_SoftDeleteWorker(obj, obj->variant.fileVariant.top, obj->variant.fileVariant.topLevel, 0);
1291 obj->softDeleted = 1;
1300 // Pruning removes any part of the file structure tree that is beyond the
1301 // bounds of the file (ie that does not point to chunks).
1303 // A file should only get pruned when its size is reduced.
1305 // Before pruning, the chunks must be pulled from the tree and the
1306 // level 0 tnode entries must be zeroed out.
1307 // Could also use this for file deletion, but that's probably better handled
1308 // by a special case.
1310 // yaffs_PruneWorker should only be called by yaffs_PruneFileStructure()
1312 static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn, __u32 level, int del0)
1321 for(i = 0; i < YAFFS_NTNODES_INTERNAL; i++)
1323 if(tn->internal[i] && level > 0)
1325 tn->internal[i] = yaffs_PruneWorker(dev,tn->internal[i],level - 1, ( i == 0) ? del0 : 1);
1334 if(hasData == 0 && del0)
1336 // Free and return NULL
1338 yaffs_FreeTnode(dev,tn);
1348 static int yaffs_PruneFileStructure(yaffs_Device *dev, yaffs_FileStructure *fStruct)
1355 if(fStruct->topLevel > 0)
1357 fStruct->top = yaffs_PruneWorker(dev,fStruct->top, fStruct->topLevel,0);
1359 // Now we have a tree with all the non-zero branches NULL but the height
1360 // is the same as it was.
1361 // Let's see if we can trim internal tnodes to shorten the tree.
1362 // We can do this if only the 0th element in the tnode is in use
1363 // (ie all the non-zero are NULL)
1365 while(fStruct->topLevel && !done)
1370 for(i = 1; i <YAFFS_NTNODES_INTERNAL; i++)
1380 fStruct->top = tn->internal[0];
1381 fStruct->topLevel--;
1382 yaffs_FreeTnode(dev,tn);
1398 /////////////////////// End of File Structure functions. /////////////////
1400 // yaffs_CreateFreeObjects creates a bunch more objects and
1401 // adds them to the object free list.
1402 static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)
1405 yaffs_Object *newObjects;
1406 yaffs_ObjectList *list;
1408 if(nObjects < 1) return YAFFS_OK;
1410 // make these things
1412 newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
1416 T(YAFFS_TRACE_ALLOCATE,(TSTR("yaffs: Could not allocate more objects" TENDSTR)));
1420 // Hook them into the free list
1421 for(i = 0; i < nObjects - 1; i++)
1423 newObjects[i].siblings.next = (struct list_head *)(&newObjects[i+1]);
1426 newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
1427 dev->freeObjects = newObjects;
1428 dev->nFreeObjects+= nObjects;
1429 dev->nObjectsCreated+= nObjects;
1431 // Now add this bunch of Objects to a list for freeing up.
1433 list = YMALLOC(sizeof(yaffs_ObjectList));
1436 T(YAFFS_TRACE_ALLOCATE,(TSTR("Could not add objects to management list" TENDSTR)));
1440 list->objects = newObjects;
1441 list->next = dev->allocatedObjectList;
1442 dev->allocatedObjectList = list;
1451 // AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out
1452 static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
1454 yaffs_Object *tn = NULL;
1456 // If there are none left make more
1457 if(!dev->freeObjects)
1459 yaffs_CreateFreeObjects(dev,YAFFS_ALLOCATION_NOBJECTS);
1462 if(dev->freeObjects)
1464 tn = dev->freeObjects;
1465 dev->freeObjects = (yaffs_Object *)(dev->freeObjects->siblings.next);
1466 dev->nFreeObjects--;
1468 // Now sweeten it up...
1470 memset(tn,0,sizeof(yaffs_Object));
1473 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
1474 INIT_LIST_HEAD(&(tn->hardLinks));
1475 INIT_LIST_HEAD(&(tn->hashLink));
1476 INIT_LIST_HEAD(&tn->siblings);
1478 // Add it to the lost and found directory.
1479 // NB Can't put root or lostNFound in lostNFound so
1480 // check if lostNFound exists first
1481 if(dev->lostNFoundDir)
1483 yaffs_AddObjectToDirectory(dev->lostNFoundDir,tn);
1491 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev,int number,__u32 mode)
1494 yaffs_Object *obj = yaffs_CreateNewObject(dev,number,YAFFS_OBJECT_TYPE_DIRECTORY);
1497 obj->fake = 1; // it is fake so it has no NAND presence...
1498 obj->renameAllowed= 0; // ... and we're not allowed to rename it...
1499 obj->unlinkAllowed= 0; // ... or unlink it
1502 obj->st_mode = mode;
1504 obj->chunkId = 0; // Not a valid chunk.
1512 static void yaffs_UnhashObject(yaffs_Object *tn)
1515 yaffs_Device *dev = tn->myDev;
1518 // If it is still linked into the bucket list, free from the list
1519 if(!list_empty(&tn->hashLink))
1521 list_del_init(&tn->hashLink);
1522 bucket = yaffs_HashFunction(tn->objectId);
1523 dev->objectBucket[bucket].count--;
1529 // FreeObject frees up a Object and puts it back on the free list
1530 static void yaffs_FreeObject(yaffs_Object *tn)
1533 yaffs_Device *dev = tn->myDev;
1538 // We're still hooked up to a cached inode.
1539 // Don't delete now, but mark for later deletion
1540 tn->deferedFree = 1;
1545 yaffs_UnhashObject(tn);
1547 // Link into the free list.
1548 tn->siblings.next = (struct list_head *)(dev->freeObjects);
1549 dev->freeObjects = tn;
1550 dev->nFreeObjects++;
1557 void yaffs_HandleDeferedFree(yaffs_Object *obj)
1559 if(obj->deferedFree)
1561 yaffs_FreeObject(obj);
1569 static void yaffs_DeinitialiseObjects(yaffs_Device *dev)
1571 // Free the list of allocated Objects
1573 yaffs_ObjectList *tmp;
1575 while( dev->allocatedObjectList)
1577 tmp = dev->allocatedObjectList->next;
1578 YFREE(dev->allocatedObjectList->objects);
1579 YFREE(dev->allocatedObjectList);
1581 dev->allocatedObjectList = tmp;
1584 dev->freeObjects = NULL;
1585 dev->nFreeObjects = 0;
1588 static void yaffs_InitialiseObjects(yaffs_Device *dev)
1592 dev->allocatedObjectList = NULL;
1593 dev->freeObjects = NULL;
1594 dev->nFreeObjects = 0;
1596 for(i = 0; i < YAFFS_NOBJECT_BUCKETS; i++)
1598 INIT_LIST_HEAD(&dev->objectBucket[i].list);
1599 dev->objectBucket[i].count = 0;
1609 int yaffs_FindNiceObjectBucket(yaffs_Device *dev)
1614 int lowest = 999999;
1617 // First let's see if we can find one that's empty.
1619 for(i = 0; i < 10 && lowest > 0; i++)
1622 x %= YAFFS_NOBJECT_BUCKETS;
1623 if(dev->objectBucket[x].count < lowest)
1625 lowest = dev->objectBucket[x].count;
1631 // If we didn't find an empty list, then try
1632 // looking a bit further for a short one
1634 for(i = 0; i < 10 && lowest > 3; i++)
1637 x %= YAFFS_NOBJECT_BUCKETS;
1638 if(dev->objectBucket[x].count < lowest)
1640 lowest = dev->objectBucket[x].count;
1649 static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
1651 int bucket = yaffs_FindNiceObjectBucket(dev);
1653 // Now find an object value that has not already been taken
1654 // by scanning the list.
1657 struct list_head *i;
1659 __u32 n = (__u32)bucket;
1661 //yaffs_CheckObjectHashSanity();
1666 n += YAFFS_NOBJECT_BUCKETS;
1667 if(1 ||dev->objectBucket[bucket].count > 0)
1669 list_for_each(i,&dev->objectBucket[bucket].list)
1671 // If there is already one in the list
1672 if(i && list_entry(i, yaffs_Object,hashLink)->objectId == n)
1680 //T(("bucket %d count %d inode %d\n",bucket,yaffs_objectBucket[bucket].count,n);
1685 void yaffs_HashObject(yaffs_Object *in)
1687 int bucket = yaffs_HashFunction(in->objectId);
1688 yaffs_Device *dev = in->myDev;
1690 if(!list_empty(&in->hashLink))
1696 list_add(&in->hashLink,&dev->objectBucket[bucket].list);
1697 dev->objectBucket[bucket].count++;
1701 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev,__u32 number)
1703 int bucket = yaffs_HashFunction(number);
1704 struct list_head *i;
1707 list_for_each(i,&dev->objectBucket[bucket].list)
1709 // Look if it is in the list
1712 in = list_entry(i, yaffs_Object,hashLink);
1713 if(in->objectId == number)
1725 yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev,int number,yaffs_ObjectType type)
1728 yaffs_Object *theObject;
1732 number = yaffs_CreateNewObjectNumber(dev);
1735 theObject = yaffs_AllocateEmptyObject(dev);
1739 theObject->fake = 0;
1740 theObject->renameAllowed = 1;
1741 theObject->unlinkAllowed = 1;
1742 theObject->objectId = number;
1743 yaffs_HashObject(theObject);
1744 theObject->variantType = type;
1745 #ifdef CONFIG_YAFFS_WINCE
1746 yfsd_WinFileTimeNow(theObject->win_atime);
1747 theObject->win_ctime[0] = theObject->win_mtime[0] = theObject->win_atime[0];
1748 theObject->win_ctime[1] = theObject->win_mtime[1] = theObject->win_atime[1];
1752 theObject->st_atime = theObject->st_mtime = theObject->st_ctime = Y_CURRENT_TIME;
1756 case YAFFS_OBJECT_TYPE_FILE:
1757 theObject->variant.fileVariant.fileSize = 0;
1758 theObject->variant.fileVariant.scannedFileSize = 0;
1759 theObject->variant.fileVariant.topLevel = 0;
1760 theObject->variant.fileVariant.top = yaffs_GetTnode(dev);
1762 case YAFFS_OBJECT_TYPE_DIRECTORY:
1763 INIT_LIST_HEAD(&theObject->variant.directoryVariant.children);
1765 case YAFFS_OBJECT_TYPE_SYMLINK:
1766 // No action required
1768 case YAFFS_OBJECT_TYPE_HARDLINK:
1769 // No action required
1771 case YAFFS_OBJECT_TYPE_SPECIAL:
1772 // No action required
1774 case YAFFS_OBJECT_TYPE_UNKNOWN:
1775 // todo this should not happen
1783 yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev, int number,yaffs_ObjectType type)
1785 yaffs_Object *theObject = NULL;
1789 theObject = yaffs_FindObjectByNumber(dev,number);
1794 theObject = yaffs_CreateNewObject(dev,number,type);
1801 YCHAR *yaffs_CloneString(const YCHAR *str)
1803 YCHAR *newStr = NULL;
1807 newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
1808 yaffs_strcpy(newStr,str);
1816 // Mknod (create) a new object.
1817 // equivalentObject only has meaning for a hard link;
1818 // aliasString only has meaning for a sumlink.
1819 // rdev only has meaning for devices (a subset of special objects)
1820 yaffs_Object *yaffs_MknodObject( yaffs_ObjectType type,
1821 yaffs_Object *parent,
1826 yaffs_Object *equivalentObject,
1827 const YCHAR *aliasString,
1832 yaffs_Device *dev = parent->myDev;
1834 // Check if the entry exists. If it does then fail the call since we don't want a dup.
1835 if(yaffs_FindObjectByName(parent,name))
1840 in = yaffs_CreateNewObject(dev,-1,type);
1846 in->variantType = type;
1850 #ifdef CONFIG_YAFFS_WINCE
1851 yfsd_WinFileTimeNow(in->win_atime);
1852 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
1853 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
1856 in->st_atime = in->st_mtime = in->st_ctime = Y_CURRENT_TIME;
1862 in->nDataChunks = 0;
1864 yaffs_SetObjectName(in,name);
1867 yaffs_AddObjectToDirectory(parent,in);
1869 in->myDev = parent->myDev;
1874 case YAFFS_OBJECT_TYPE_SYMLINK:
1875 in->variant.symLinkVariant.alias = yaffs_CloneString(aliasString);
1877 case YAFFS_OBJECT_TYPE_HARDLINK:
1878 in->variant.hardLinkVariant.equivalentObject = equivalentObject;
1879 in->variant.hardLinkVariant.equivalentObjectId = equivalentObject->objectId;
1880 list_add(&in->hardLinks,&equivalentObject->hardLinks);
1882 case YAFFS_OBJECT_TYPE_FILE: // do nothing
1883 case YAFFS_OBJECT_TYPE_DIRECTORY: // do nothing
1884 case YAFFS_OBJECT_TYPE_SPECIAL: // do nothing
1885 case YAFFS_OBJECT_TYPE_UNKNOWN:
1889 if(/*yaffs_GetNumberOfFreeChunks(dev) <= 0 || */
1890 yaffs_UpdateObjectHeader(in,name,0,0) < 0)
1892 // Could not create the object header, fail the creation
1893 yaffs_DestroyObject(in);
1902 yaffs_Object *yaffs_MknodFile(yaffs_Object *parent,const YCHAR *name, __u32 mode, __u32 uid, __u32 gid)
1904 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE,parent,name,mode,uid,gid,NULL,NULL,0);
1907 yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent,const YCHAR *name, __u32 mode, __u32 uid, __u32 gid)
1909 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY,parent,name,mode,uid,gid,NULL,NULL,0);
1912 yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent,const YCHAR *name, __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
1914 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY,parent,name,mode,uid,gid,NULL,NULL,rdev);
1917 yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent,const YCHAR *name, __u32 mode, __u32 uid, __u32 gid,const YCHAR *alias)
1919 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK,parent,name,mode,uid,gid,NULL,alias,0);
1922 // NB yaffs_Link returns the object id of the equivalent object.
1923 yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name, yaffs_Object *equivalentObject)
1925 // Get the real object in case we were fed a hard link as an equivalent object
1926 equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
1928 if(yaffs_MknodObject(YAFFS_OBJECT_TYPE_HARDLINK,parent,name,0,0,0,equivalentObject,NULL,0))
1930 return equivalentObject;
1940 static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir, const YCHAR *newName,int force)
1947 newDir = obj->parent; // use the old directory
1950 // TODO: Do we need this different handling for YAFFS2 and YAFFS1??
1951 if(obj->myDev->isYaffs2)
1953 unlinkOp = (newDir == obj->myDev->unlinkedDir);
1957 unlinkOp = (newDir == obj->myDev->unlinkedDir && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
1960 deleteOp = (newDir == obj->myDev->deletedDir);
1962 // If the object is a file going into the unlinked directory, then it is OK to just stuff it in since
1963 // duplicate names are allowed.
1964 // Otherwise only proceed if the new name does not exist and if we're putting it into a directory.
1968 !yaffs_FindObjectByName(newDir,newName)) &&
1969 newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
1971 yaffs_SetObjectName(obj,newName);
1974 yaffs_AddObjectToDirectory(newDir,obj);
1976 if(unlinkOp) obj->unlinked = 1;
1978 // If it is a dletion then we mark it as a shrink for gc purposes.
1979 if(yaffs_UpdateObjectHeader(obj,newName,0,deleteOp) >= 0)
1990 int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName, yaffs_Object *newDir, const YCHAR *newName)
1995 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1996 // Special case for case insemsitive systems (eg. WinCE).
1997 // While look-up is case insensitive, the name isn't.
1998 // THerefore we might want to change x.txt to X.txt
1999 if(oldDir == newDir && yaffs_strcmp(oldName,newName) == 0)
2005 obj = yaffs_FindObjectByName(oldDir,oldName);
2006 if(obj && obj->renameAllowed)
2008 return yaffs_ChangeObjectName(obj,newDir,newName,force);
2015 static int yaffs_CheckObjectHashSanity(yaffs_Device *dev)
2017 // Scan the buckets and check that the lists
2018 // have as many members as the count says there are
2021 struct list_head *j;
2024 for(bucket = 0; bucket < YAFFS_NOBJECT_BUCKETS; bucket++)
2028 list_for_each(j,&dev->objectBucket[bucket].list)
2033 if(countEm != dev->objectBucket[bucket].count)
2035 T(YAFFS_TRACE_ERROR,(TSTR("Inode hash inconsistency" TENDSTR)));
2044 void yaffs_ObjectTest(yaffs_Device *dev)
2046 yaffs_Object *in[1000];
2048 yaffs_Object *inold[1000];
2052 memset(in,0,1000*sizeof(yaffs_Object *));
2053 memset(inold,0,1000*sizeof(yaffs_Object *));
2055 yaffs_CheckObjectHashSanity(dev);
2057 for(j = 0; j < 10; j++)
2061 for(i = 0; i < 1000; i++)
2063 in[i] = yaffs_CreateNewObject(dev,-1,YAFFS_OBJECT_TYPE_FILE);
2066 YINFO("No more inodes");
2070 inNo[i] = in[i]->objectId;
2074 for(i = 0; i < 1000; i++)
2076 if(yaffs_FindObjectByNumber(dev,inNo[i]) != in[i])
2078 //T(("Differnce in look up test\n"));
2082 // T(("Look up ok\n"));
2086 yaffs_CheckObjectHashSanity(dev);
2088 for(i = 0; i < 1000; i+=3)
2090 yaffs_FreeObject(in[i]);
2095 yaffs_CheckObjectHashSanity(dev);
2102 /////////////////////////// Block Management and Page Allocation ///////////////////
2105 static int yaffs_InitialiseBlocks(yaffs_Device *dev,int nBlocks)
2107 dev->allocationBlock = -1; // force it to get a new one
2108 //Todo we're assuming the malloc will pass.
2109 dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
2110 // Set up dynamic blockinfo stuff.
2111 dev->chunkBitmapStride = (dev->nChunksPerBlock+7)/8;
2112 dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
2113 if(dev->blockInfo && dev->chunkBits)
2115 memset(dev->blockInfo,0,nBlocks * sizeof(yaffs_BlockInfo));
2116 memset(dev->chunkBits,0,dev->chunkBitmapStride * nBlocks);
2124 static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
2126 YFREE(dev->blockInfo);
2127 dev->blockInfo = NULL;
2128 YFREE(dev->chunkBits);
2129 dev->chunkBits = NULL;
2133 static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device *dev, yaffs_BlockInfo *bi)
2139 if(!dev->isYaffs2) return 1; // disqualification only applies to yaffs2.
2141 if(!bi->hasShrinkHeader) return 1; // can gc
2144 // Find the oldest dirty sequence number if we don't know it and save it
2145 // so we don't have to keep recomputing it.
2146 if(!dev->oldestDirtySequence)
2148 seq = dev->sequenceNumber;
2150 for(i = dev->startBlock; i <= dev->endBlock; i++)
2152 b = yaffs_GetBlockInfo(dev,i);
2153 if(b->blockState == YAFFS_BLOCK_STATE_FULL &&
2154 (b->pagesInUse - b->softDeletions )< dev->nChunksPerBlock &&
2155 b->sequenceNumber < seq)
2157 seq = b->sequenceNumber;
2160 dev->oldestDirtySequence = seq;
2164 // Can't do gc of this block if there are any blocks older than this one that have
2166 return (bi->sequenceNumber <= dev->oldestDirtySequence);
2173 // FindDiretiestBlock is used to select the dirtiest block (or close enough)
2174 // for garbage collection.
2179 static int yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,int aggressive)
2182 int b = dev->currentDirtyChecker;
2188 yaffs_BlockInfo *bi;
2189 static int nonAggressiveSkip = 0;
2191 // If we're doing aggressive GC then we are happy to take a less-dirty block, and
2193 // else (we're doing a leasurely gc), then we only bother to do this if the
2194 // block has only a few pages in use.
2197 nonAggressiveSkip--;
2199 if(!aggressive &&(nonAggressiveSkip > 0))
2204 pagesInUse = (aggressive)? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
2207 iterations = dev->endBlock - dev->startBlock + 1;
2211 iterations = dev->endBlock - dev->startBlock + 1;
2212 iterations = iterations / 16;
2213 if(iterations > 200)
2219 for(i = 0; i <= iterations && pagesInUse > 0 ; i++)
2222 if ( b < dev->startBlock || b > dev->endBlock)
2224 b = dev->startBlock;
2227 if(b < dev->startBlock || b > dev->endBlock)
2229 T(YAFFS_TRACE_ERROR,(TSTR("**>> Block %d is not valid" TENDSTR),b));
2233 bi = yaffs_GetBlockInfo(dev,b);
2235 if(bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2236 (bi->pagesInUse - bi->softDeletions )< pagesInUse &&
2237 yaffs_BlockNotDisqualifiedFromGC(dev,bi))
2240 pagesInUse = (bi->pagesInUse - bi->softDeletions);
2244 dev->currentDirtyChecker = b;
2248 T(YAFFS_TRACE_GC,(TSTR("GC Selected block %d with %d free" TENDSTR),dirtiest,dev->nChunksPerBlock - pagesInUse));
2251 dev->oldestDirtySequence = 0; // clear this
2255 nonAggressiveSkip = 4;
2262 static void yaffs_BlockBecameDirty(yaffs_Device *dev,int blockNo)
2264 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,blockNo);
2268 // If the block is still healthy erase it and mark as clean.
2269 // If the block has had a data failure, then retire it.
2270 bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
2272 if(!bi->needsRetiring)
2274 erasedOk = yaffs_EraseBlockInNAND(dev,blockNo);
2277 dev->nErasureFailures++;
2278 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>> Erasure failed %d" TENDSTR),blockNo));
2282 if(erasedOk && (yaffs_traceMask & YAFFS_TRACE_ERASE))
2285 for(i = 0; i < dev->nChunksPerBlock; i++)
2287 if(!yaffs_CheckChunkErased(dev,blockNo * dev->nChunksPerBlock + i))
2289 T(YAFFS_TRACE_ERROR,(TSTR(">>Block %d erasure supposedly OK, but chunk %d not erased" TENDSTR),blockNo,i));
2297 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
2298 dev->nErasedBlocks++;
2300 bi->softDeletions = 0;
2301 bi->hasShrinkHeader=0;
2302 yaffs_ClearChunkBits(dev,blockNo);
2304 T(YAFFS_TRACE_ERASE,(TSTR("Erased block %d" TENDSTR),blockNo));
2308 yaffs_RetireBlock(dev,blockNo);
2309 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>> Block %d retired" TENDSTR),blockNo));
2313 static void yaffs_DumpBlockStats(yaffs_Device *dev)
2316 yaffs_BlockInfo *bi;
2318 for(i= dev->startBlock; i <=dev->endBlock; i++)
2320 bi = yaffs_GetBlockInfo(dev,i);
2321 T(YAFFS_TRACE_ALLOCATE,(TSTR("%3d state %d shrink %d inuse %d/%d seq %d pages"),i,
2322 bi->blockState,bi->hasShrinkHeader,bi->pagesInUse,bi->softDeletions,bi->sequenceNumber));
2324 for(j = 0; j < dev->nChunksPerBlock; j++)
2326 if(yaffs_CheckChunkBit(dev,i,j))
2328 T(YAFFS_TRACE_ALLOCATE,(TSTR(" %d"),j));
2332 T(YAFFS_TRACE_ALLOCATE,(TSTR(" " TENDSTR)));
2338 static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
2342 yaffs_BlockInfo *bi;
2347 if(j < 0 || j > 100)
2350 yaffs_DumpBlockStats(dev);
2355 if(dev->nErasedBlocks < 1)
2357 // Hoosterman we've got a problem.
2358 // Can't get space to gc
2359 T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: no more eraased blocks" TENDSTR)));
2364 // Find an empty block.
2366 for(i = dev->startBlock; i <= dev->endBlock; i++)
2368 dev->allocationBlockFinder++;
2369 if(dev->allocationBlockFinder < dev->startBlock || dev->allocationBlockFinder> dev->endBlock)
2371 dev->allocationBlockFinder = dev->startBlock;
2374 bi = yaffs_GetBlockInfo(dev,dev->allocationBlockFinder);
2376 if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY)
2378 bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
2379 dev->sequenceNumber++;
2380 bi->sequenceNumber = dev->sequenceNumber;
2381 dev->nErasedBlocks--;
2382 T(YAFFS_TRACE_ALLOCATE,(TSTR("Allocated block %d, seq %d" TENDSTR),dev->allocationBlockFinder,dev->sequenceNumber));
2383 return dev->allocationBlockFinder;
2386 T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: no more eraased blocks, but there should have been one" TENDSTR)));
2394 static int yaffs_AllocateChunk(yaffs_Device *dev,int useReserve)
2397 yaffs_BlockInfo *bi;
2399 if(dev->allocationBlock < 0)
2401 // Get next block to allocate off
2402 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
2403 dev->allocationPage = 0;
2406 if(!useReserve && dev->nErasedBlocks </*=*/ dev->nReservedBlocks)
2408 // Not enough space to allocate unless we're allowed to use the reserve.
2412 if(dev->nErasedBlocks < dev->nReservedBlocks && dev->allocationPage == 0)
2414 T(YAFFS_TRACE_ALLOCATE,(TSTR("Allocating reserve" TENDSTR)));
2418 // Next page please....
2419 if(dev->allocationBlock >= 0)
2421 bi = yaffs_GetBlockInfo(dev,dev->allocationBlock);
2423 retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
2424 dev->allocationPage;
2426 yaffs_SetChunkBit(dev,dev->allocationBlock,dev->allocationPage);
2428 dev->allocationPage++;
2432 // If the block is full set the state to full
2433 if(dev->allocationPage >= dev->nChunksPerBlock)
2435 bi->blockState = YAFFS_BLOCK_STATE_FULL;
2436 dev->allocationBlock = -1;
2443 T(YAFFS_TRACE_ERROR,(TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
2449 // To determine if we have enough space we just look at the
2450 // number of erased blocks.
2451 // The cache is allowed to use reserved blocks.
2453 static int yaffs_CheckSpaceForChunkCache(yaffs_Device *dev)
2455 return (dev->nErasedBlocks >= dev->nReservedBlocks);
2459 static int yaffs_GetErasedChunks(yaffs_Device *dev)
2463 n = dev->nErasedBlocks * dev->nChunksPerBlock;
2465 if(dev->allocationBlock> 0)
2467 n += (dev->nChunksPerBlock - dev->allocationPage);
2474 int yaffs_GarbageCollectBlock(yaffs_Device *dev,int block)
2480 int retVal = YAFFS_OK;
2484 int chunksBefore = yaffs_GetErasedChunks(dev);
2487 yaffs_ExtendedTags tags;
2489 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,block);
2491 yaffs_Object *object;
2493 bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
2495 T(YAFFS_TRACE_TRACING,(TSTR("Collecting block %d, in use %d, shrink %d, " TENDSTR),block,bi->pagesInUse,bi->hasShrinkHeader));
2496 //T(("Collecting block %d n %d bits %x\n",block, bi->pagesInUse, bi->pageBits));
2498 bi->hasShrinkHeader = 0; // clear the flag so that the block can erase
2501 if(!yaffs_StillSomeChunkBits(dev,block))
2503 T(YAFFS_TRACE_TRACING,(TSTR("Collecting block %d that has no chunks in use" TENDSTR),block));
2504 yaffs_BlockBecameDirty(dev,block);
2509 __u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__);
2511 for(chunkInBlock = 0,oldChunk = block * dev->nChunksPerBlock;
2512 chunkInBlock < dev->nChunksPerBlock && yaffs_StillSomeChunkBits(dev,block);
2513 chunkInBlock++, oldChunk++ )
2515 if(yaffs_CheckChunkBit(dev,block,chunkInBlock))
2518 // This page is in use and might need to be copied off
2522 //T(("copying page %x from %d to %d\n",mask,oldChunk,newChunk));
2524 yaffs_InitialiseTags(&tags);
2526 yaffs_ReadChunkWithTagsFromNAND(dev,oldChunk,buffer, &tags);
2528 object = yaffs_FindObjectByNumber(dev,tags.objectId);
2530 T(YAFFS_TRACE_GC_DETAIL,(TSTR("Collecting page %d, %d %d %d " TENDSTR),chunkInBlock,tags.objectId,tags.chunkId,tags.byteCount));
2534 T(YAFFS_TRACE_ERROR,(TSTR("page %d in gc has no object " TENDSTR),oldChunk));
2537 if(object && object->deleted && tags.chunkId != 0)
2539 // Data chunk in a deleted file, throw it away
2540 // It's a deleted data chunk,
2541 // No need to copy this, just forget about it and fix up the
2544 //yaffs_PutChunkIntoFile(object, tags.chunkId, 0,0);
2545 object->nDataChunks--;
2547 if(object->nDataChunks <= 0)
2549 // remeber to clean up the object
2550 dev->gcCleanupList[cleanups] = tags.objectId;
2555 else if( 0 /* Todo object && object->deleted && object->nDataChunks == 0 */)
2557 // Deleted object header with no data chunks.
2558 // Can be discarded and the file deleted.
2559 object->chunkId = 0;
2560 yaffs_FreeTnode(object->myDev,object->variant.fileVariant.top);
2561 object->variant.fileVariant.top = NULL;
2562 yaffs_DoGenericObjectDeletion(object);
2567 // It's either a data chunk in a live file or
2568 // an ObjectHeader, so we're interested in it.
2569 // NB Need to keep the ObjectHeaders of deleted files
2570 // until the whole file has been deleted off
2571 tags.serialNumber++;
2575 newChunk = yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags,1);
2579 retVal = YAFFS_FAIL;
2584 // Ok, now fix up the Tnodes etc.
2586 if(tags.chunkId == 0)
2589 object->chunkId = newChunk;
2590 object->serial = tags.serialNumber;
2594 // It's a data chunk
2595 yaffs_PutChunkIntoFile(object, tags.chunkId, newChunk,0);
2600 yaffs_DeleteChunk(dev,oldChunk,markNAND,__LINE__);
2605 yaffs_ReleaseTempBuffer(dev,buffer,__LINE__);
2608 // Do any required cleanups
2609 for(i = 0; i < cleanups; i++)
2611 // Time to delete the file too
2612 object = yaffs_FindObjectByNumber(dev,dev->gcCleanupList[i]);
2615 yaffs_FreeTnode(dev,object->variant.fileVariant.top);
2616 object->variant.fileVariant.top = NULL;
2617 T(YAFFS_TRACE_GC,(TSTR("yaffs: About to finally delete object %d" TENDSTR),object->objectId));
2618 yaffs_DoGenericObjectDeletion(object);
2625 if(chunksBefore >= (chunksAfter = yaffs_GetErasedChunks(dev)))
2627 T(YAFFS_TRACE_GC,(TSTR("gc did not increase free chunks before %d after %d" TENDSTR),chunksBefore,chunksAfter));
2634 static yaffs_Object *yaffs_FindDeletedUnlinkedFile(yaffs_Device *dev)
2636 // find a file to delete
2637 struct list_head *i;
2641 //Scan the unlinked files looking for one to delete
2642 list_for_each(i,&dev->unlinkedDir->variant.directoryVariant.children)
2646 l = list_entry(i, yaffs_Object,siblings);
2657 static void yaffs_DoUnlinkedFileDeletion(yaffs_Device *dev)
2659 // This does background deletion on unlinked files.. only deleted ones.
2660 // If we don't have a file we're working on then find one
2661 if(!dev->unlinkedDeletion && dev->nDeletedFiles > 0)
2663 dev->unlinkedDeletion = yaffs_FindDeletedUnlinkedFile(dev);
2666 // OK, we're working on a file...
2667 if(dev->unlinkedDeletion)
2669 yaffs_Object *obj = dev->unlinkedDeletion;
2671 int limit; // Number of chunks to delete in a file.
2672 // NB this can be exceeded, but not by much.
2676 delresult = yaffs_DeleteWorker(obj, obj->variant.fileVariant.top, obj->variant.fileVariant.topLevel, 0,&limit);
2678 if(obj->nDataChunks == 0)
2680 // Done all the deleting of data chunks.
2681 // Now dump the header and clean up
2682 yaffs_FreeTnode(dev,obj->variant.fileVariant.top);
2683 obj->variant.fileVariant.top = NULL;
2684 yaffs_DoGenericObjectDeletion(obj);
2685 dev->nDeletedFiles--;
2686 dev->nUnlinkedFiles--;
2687 dev->nBackgroundDeletions++;
2688 dev->unlinkedDeletion = NULL;
2696 #define YAFFS_GARBAGE_COLLECT_LOW_WATER 2
2697 static int yaffs_CheckGarbageCollection(yaffs_Device *dev)
2702 //yaffs_DoUnlinkedFileDeletion(dev);
2704 if(dev->nErasedBlocks <= (dev->nReservedBlocks + YAFFS_GARBAGE_COLLECT_LOW_WATER))
2711 block = yaffs_FindBlockForGarbageCollection(dev,aggressive);
2715 dev->garbageCollections++;
2716 return yaffs_GarbageCollectBlock(dev,block);
2728 // New garbage collector
2729 // If we're very low on erased blocks then we do aggressive garbage collection
2730 // otherwise we do "leasurely" garbage collection.
2731 // Aggressive gc looks further (whole array) and will accept dirtier blocks.
2732 // Passive gc only inspects smaller areas and will only accept cleaner blocks.
2734 // The idea is to help clear out space in a more spread-out manner.
2735 // Dunno if it really does anything useful.
2737 int yaffs_CheckGarbageCollection(yaffs_Device *dev)
2741 int gcOk = YAFFS_OK;
2744 //yaffs_DoUnlinkedFileDeletion(dev);
2746 // This loop should pass the first time.
2747 // We'll only see looping here if the erase of the collected block fails.
2751 if(dev->nErasedBlocks <= (dev->nReservedBlocks + 2))
2753 // We need a block soon...
2758 // We're in no hurry
2762 block = yaffs_FindBlockForGarbageCollection(dev,aggressive);
2766 dev->garbageCollections++;
2769 dev->passiveGarbageCollections++;
2772 T(YAFFS_TRACE_GC,(TSTR("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),dev->nErasedBlocks,aggressive));
2774 gcOk = yaffs_GarbageCollectBlock(dev,block);
2777 if(dev->nErasedBlocks <= (dev->nReservedBlocks + 1))
2779 T(YAFFS_TRACE_GC,(TSTR("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d" TENDSTR),dev->nErasedBlocks,maxTries,block));
2781 } while((dev->nErasedBlocks <= (dev->nReservedBlocks + 1)) && (block > 0) && (maxTries < 5));
2783 return aggressive ? gcOk: YAFFS_OK;
2787 //////////////////////////// TAGS ///////////////////////////////////////
2790 void yaffs_InitialiseTags(yaffs_ExtendedTags *tags)
2792 memset(tags,0,sizeof(yaffs_ExtendedTags));
2793 tags->validMarker0 = 0xAAAAAAAA;
2794 tags->validMarker1 = 0x55555555;
2797 static int yaffs_ValidateTags(yaffs_ExtendedTags *tags)
2799 return (tags->validMarker0 == 0xAAAAAAAA && tags->validMarker1 == 0x55555555);
2806 void yaffs_CalcTagsECC(yaffs_Tags *tags)
2810 unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes;
2817 for(i = 0; i < 8; i++)
2819 for(j = 1; j &0xff; j<<=1)
2834 int yaffs_CheckECCOnTags(yaffs_Tags *tags)
2836 unsigned ecc = tags->ecc;
2838 yaffs_CalcTagsECC(tags);
2842 if(ecc && ecc <= 64)
2844 // TODO: Handle the failure better. Retire?
2845 unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes;
2849 b[ecc / 8] ^= (1 << (ecc & 7));
2851 // Now recvalc the ecc
2852 yaffs_CalcTagsECC(tags);
2854 return 1; // recovered error
2858 // Wierd ecc failure value
2859 // TODO Need to do somethiong here
2860 return -1; //unrecovered error
2866 static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr)
2868 yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr;
2870 yaffs_CalcTagsECC(tagsPtr);
2872 sparePtr->tagByte0 = tu->asBytes[0];
2873 sparePtr->tagByte1 = tu->asBytes[1];
2874 sparePtr->tagByte2 = tu->asBytes[2];
2875 sparePtr->tagByte3 = tu->asBytes[3];
2876 sparePtr->tagByte4 = tu->asBytes[4];
2877 sparePtr->tagByte5 = tu->asBytes[5];
2878 sparePtr->tagByte6 = tu->asBytes[6];
2879 sparePtr->tagByte7 = tu->asBytes[7];
2882 static void yaffs_GetTagsFromSpare(yaffs_Device *dev, yaffs_Spare *sparePtr,yaffs_Tags *tagsPtr)
2884 yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr;
2887 tu->asBytes[0]= sparePtr->tagByte0;
2888 tu->asBytes[1]= sparePtr->tagByte1;
2889 tu->asBytes[2]= sparePtr->tagByte2;
2890 tu->asBytes[3]= sparePtr->tagByte3;
2891 tu->asBytes[4]= sparePtr->tagByte4;
2892 tu->asBytes[5]= sparePtr->tagByte5;
2893 tu->asBytes[6]= sparePtr->tagByte6;
2894 tu->asBytes[7]= sparePtr->tagByte7;
2896 result = yaffs_CheckECCOnTags(tagsPtr);
2899 dev->tagsEccFixed++;
2903 dev->tagsEccUnfixed++;
2907 static void yaffs_SpareInitialise(yaffs_Spare *spare)
2909 memset(spare,0xFF,sizeof(yaffs_Spare));
2915 static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev, const __u8 *buffer, yaffs_ExtendedTags *tags, int useReserve)
2917 // NB There must be tags, data is optional
2918 // If there is data, then an ECC is calculated on it.
2927 //yaffs_SpareInitialise(&spare);
2929 //if(!dev->useNANDECC && buffer)
2931 // yaffs_CalcECC(buffer,&spare);
2934 //yaffs_LoadTagsIntoSpare(&spare,tags);
2936 return yaffs_WriteNewChunkToNAND(dev,buffer,&spare,useReserve);
2941 static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId, int chunkInObject)
2943 return ( tags->chunkId == chunkInObject &&
2944 tags->objectId == objectId &&
2945 !tags->chunkDeleted) ? 1 : 0;
2951 int yaffs_FindChunkInFile(yaffs_Object *in,int chunkInInode,yaffs_ExtendedTags *tags)
2953 //Get the Tnode, then get the level 0 offset chunk offset
2956 yaffs_ExtendedTags localTags;
2959 yaffs_Device *dev = in->myDev;
2964 // Passed a NULL, so use our own tags space
2968 tn = yaffs_FindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode);
2972 theChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->chunkGroupBits;
2974 retVal = yaffs_FindChunkInGroup(dev,theChunk,tags,in->objectId,chunkInInode);
2979 int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in,int chunkInInode,yaffs_ExtendedTags *tags)
2981 //Get the Tnode, then get the level 0 offset chunk offset
2984 yaffs_ExtendedTags localTags;
2986 yaffs_Device *dev = in->myDev;
2991 // Passed a NULL, so use our own tags space
2995 tn = yaffs_FindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode);
3000 theChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->chunkGroupBits;
3002 retVal = yaffs_FindChunkInGroup(dev,theChunk,tags,in->objectId,chunkInInode);
3004 // Delete the entry in the filestructure (if found)
3007 tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = 0;
3012 //T(("No level 0 found for %d\n", chunkInInode));
3017 //T(("Could not find %d to delete\n",chunkInInode));
3023 #ifdef YAFFS_PARANOID
3025 static int yaffs_CheckFileSanity(yaffs_Object *in)
3033 yaffs_Tags localTags;
3034 yaffs_Tags *tags = &localTags;
3039 if(in->variantType != YAFFS_OBJECT_TYPE_FILE)
3041 //T(("Object not a file\n"));
3045 objId = in->objectId;
3046 fSize = in->variant.fileVariant.fileSize;
3047 nChunks = (fSize + in->myDev->nBytesPerChunk -1)/in->myDev->nBytesPerChunk;
3049 for(chunk = 1; chunk <= nChunks; chunk++)
3051 tn = yaffs_FindLevel0Tnode(in->myDev,&in->variant.fileVariant, chunk);
3056 theChunk = tn->level0[chunk & YAFFS_TNODES_LEVEL0_MASK] << in->myDev->chunkGroupBits;
3058 if(yaffs_CheckChunkBits(dev,theChunk/dev->nChunksPerBlock,theChunk%dev->nChunksPerBlock))
3062 yaffs_ReadChunkTagsFromNAND(in->myDev,theChunk,tags,&chunkDeleted);
3063 if(yaffs_TagsMatch(tags,in->objectId,chunk,chunkDeleted))
3071 //T(("File problem file [%d,%d] NAND %d tags[%d,%d]\n",
3072 // objId,chunk,theChunk,tags->chunkId,tags->objectId);
3081 //T(("No level 0 found for %d\n", chunk));
3085 return failed ? YAFFS_FAIL : YAFFS_OK;
3090 static int yaffs_PutChunkIntoFile(yaffs_Object *in,int chunkInInode, int chunkInNAND, int inScan)
3093 yaffs_Device *dev = in->myDev;
3095 yaffs_ExtendedTags existingTags;
3096 yaffs_ExtendedTags newTags;
3097 unsigned existingSerial, newSerial;
3099 tn = yaffs_AddOrFindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode);
3105 existingChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK];
3109 // If we're scanning then we need to test for duplicates
3110 // NB This does not need to be efficient since it should only ever
3111 // happen when the power fails during a write, then only one
3112 // chunk should ever be affected.
3115 if(existingChunk != 0)
3117 // NB Right now existing chunk will not be real chunkId if the device >= 32MB
3118 // thus we have to do a FindChunkInFile to get the real chunk id.
3120 // We have a duplicate now we need to decide which one to use
3121 // To do this we get both sets of tags and compare serial numbers.
3122 yaffs_ReadChunkWithTagsFromNAND(dev,chunkInNAND, NULL,&newTags);
3126 existingChunk = yaffs_FindChunkInFile(in,chunkInInode, &existingTags);
3128 if(existingChunk <=0)
3130 //Hoosterman - how did this happen?
3132 T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: existing chunk < 0 in scan" TENDSTR)));
3137 // NB The deleted flags should be false, otherwise the chunks will
3138 // not be loaded during a scan
3140 newSerial = newTags.serialNumber;
3141 existingSerial = existingTags.serialNumber;
3143 if( in->myDev->isYaffs2 ||
3144 existingChunk <= 0 ||
3145 ((existingSerial+1) & 3) == newSerial)
3148 // Delete the old one and drop through to update the tnode
3149 yaffs_DeleteChunk(dev,existingChunk,1,__LINE__);
3154 // Delete the new one and return early so that the tnode isn't changed
3155 yaffs_DeleteChunk(dev,chunkInNAND,1,__LINE__);
3162 if(existingChunk == 0)
3167 tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = (chunkInNAND >> dev->chunkGroupBits);
3174 int yaffs_ReadChunkDataFromObject(yaffs_Object *in,int chunkInInode, __u8 *buffer)
3176 int chunkInNAND = yaffs_FindChunkInFile(in,chunkInInode,NULL);
3178 if(chunkInNAND >= 0)
3180 return yaffs_ReadChunkWithTagsFromNAND(in->myDev,chunkInNAND,buffer,NULL);
3184 T(YAFFS_TRACE_NANDACCESS,(TSTR("Chunk %d not found zero instead" TENDSTR),chunkInNAND));
3186 memset(buffer,0,in->myDev->nBytesPerChunk); // get sane data if you read a hole
3193 void yaffs_DeleteChunk(yaffs_Device *dev,int chunkId,int markNAND,int lyn)
3197 yaffs_ExtendedTags tags;
3198 yaffs_BlockInfo *bi;
3200 if(chunkId <= 0) return;
3203 block = chunkId / dev->nChunksPerBlock;
3204 page = chunkId % dev->nChunksPerBlock;
3206 bi = yaffs_GetBlockInfo(dev,block);
3208 T(YAFFS_TRACE_DELETION,(TSTR("line %d delete of chunk %d" TENDSTR),lyn,chunkId));
3211 bi->blockState != YAFFS_BLOCK_STATE_COLLECTING &&
3214 // yaffs_SpareInitialise(&spare);
3216 #ifdef CONFIG_MTD_NAND_VERIFY_WRITE
3218 //read data before write, to ensure correct ecc
3219 //if we're using MTD verification under Linux
3220 yaffs_ReadChunkFromNAND(dev,chunkId,NULL,&spare,0);
3223 yaffs_InitialiseTags(&tags);
3225 tags.chunkDeleted = 1;
3228 yaffs_WriteChunkWithTagsToNAND(dev,chunkId,NULL,&tags);
3229 yaffs_HandleUpdateChunk(dev,chunkId,&tags);
3233 dev->nUnmarkedDeletions++;
3237 // Pull out of the management area.
3238 // If the whole block became dirty, this will kick off an erasure.
3239 if( bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
3240 bi->blockState == YAFFS_BLOCK_STATE_FULL ||
3241 bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
3242 bi->blockState == YAFFS_BLOCK_STATE_COLLECTING)
3246 yaffs_ClearChunkBit(dev,block,page);
3249 if(bi->pagesInUse == 0 &&
3250 !bi->hasShrinkHeader &&
3251 bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
3252 bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING)
3254 yaffs_BlockBecameDirty(dev,block);
3260 // T(("Bad news deleting chunk %d\n",chunkId));
3268 int yaffs_WriteChunkDataToObject(yaffs_Object *in,int chunkInInode, const __u8 *buffer,int nBytes,int useReserve)
3270 // Find old chunk Need to do this to get serial number
3271 // Write new one and patch into tree.
3272 // Invalidate old tags.
3275 yaffs_ExtendedTags prevTags;
3278 yaffs_ExtendedTags newTags;
3280 yaffs_Device *dev = in->myDev;
3282 yaffs_CheckGarbageCollection(dev);
3284 // Get the previous chunk at this location in the file if it exists
3285 prevChunkId = yaffs_FindChunkInFile(in,chunkInInode,&prevTags);
3288 yaffs_InitialiseTags(&newTags);
3290 newTags.chunkId = chunkInInode;
3291 newTags.objectId = in->objectId;
3292 newTags.serialNumber = (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;
3293 newTags.byteCount = nBytes;
3295 // yaffs_CalcTagsECC(&newTags);
3297 newChunkId = yaffs_WriteNewChunkWithTagsToNAND(dev,buffer,&newTags,useReserve);
3301 yaffs_PutChunkIntoFile(in,chunkInInode,newChunkId,0);
3304 if(prevChunkId >= 0)
3306 yaffs_DeleteChunk(dev,prevChunkId,1,__LINE__);
3310 yaffs_CheckFileSanity(in);
3321 // UpdateObjectHeader updates the header on NAND for an object.
3322 // If name is not NULL, then that new name is used.
3324 int yaffs_UpdateObjectHeader(yaffs_Object *in,const YCHAR *name, int force,int isShrink)
3327 yaffs_BlockInfo *bi;
3329 yaffs_Device *dev = in->myDev;
3335 yaffs_ExtendedTags newTags;
3337 __u8 *buffer = NULL;
3338 YCHAR oldName[YAFFS_MAX_NAME_LENGTH+1];
3340 // __u8 bufferOld[YAFFS_BYTES_PER_CHUNK];
3342 yaffs_ObjectHeader *oh = NULL;
3343 // yaffs_ObjectHeader *ohOld = (yaffs_ObjectHeader *)bufferOld;
3346 if(!in->fake || force)
3349 yaffs_CheckGarbageCollection(dev);
3351 buffer = yaffs_GetTempBuffer(in->myDev,__LINE__);
3352 oh = (yaffs_ObjectHeader *)buffer;
3354 prevChunkId = in->chunkId;
3356 if(prevChunkId >= 0)
3358 yaffs_ReadChunkWithTagsFromNAND(dev,prevChunkId,buffer,NULL);
3359 memcpy(oldName,oh->name,sizeof(oh->name));
3362 memset(buffer,0xFF,dev->nBytesPerChunk);
3365 oh->type = in->variantType;
3367 oh->st_mode = in->st_mode;
3369 #ifdef CONFIG_YAFFS_WINCE
3370 oh->win_atime[0] = in->win_atime[0];
3371 oh->win_ctime[0] = in->win_ctime[0];
3372 oh->win_mtime[0] = in->win_mtime[0];
3373 oh->win_atime[1] = in->win_atime[1];
3374 oh->win_ctime[1] = in->win_ctime[1];
3375 oh->win_mtime[1] = in->win_mtime[1];
3377 oh->st_uid = in->st_uid;
3378 oh->st_gid = in->st_gid;
3379 oh->st_atime = in->st_atime;
3380 oh->st_mtime = in->st_mtime;
3381 oh->st_ctime = in->st_ctime;
3382 oh->st_rdev = in->st_rdev;
3386 oh->parentObjectId = in->parent->objectId;
3390 oh->parentObjectId = 0;
3393 //oh->sum = in->sum;
3396 memset(oh->name,0,sizeof(oh->name));
3397 yaffs_strncpy(oh->name,name,YAFFS_MAX_NAME_LENGTH);
3399 else if(prevChunkId)
3401 memcpy(oh->name, oldName,sizeof(oh->name));
3405 memset(oh->name,0,sizeof(oh->name));
3408 oh->isShrink = isShrink;
3410 switch(in->variantType)
3412 case YAFFS_OBJECT_TYPE_UNKNOWN:
3413 // Should not happen
3415 case YAFFS_OBJECT_TYPE_FILE:
3416 oh->fileSize = in->variant.fileVariant.fileSize;
3418 case YAFFS_OBJECT_TYPE_HARDLINK:
3419 oh->equivalentObjectId = in->variant.hardLinkVariant.equivalentObjectId;
3421 case YAFFS_OBJECT_TYPE_SPECIAL:
3424 case YAFFS_OBJECT_TYPE_DIRECTORY:
3427 case YAFFS_OBJECT_TYPE_SYMLINK:
3428 yaffs_strncpy(oh->alias,in->variant.symLinkVariant.alias,YAFFS_MAX_ALIAS_LENGTH);
3429 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3434 yaffs_InitialiseTags(&newTags);
3436 newTags.chunkId = 0;
3437 newTags.objectId = in->objectId;
3438 newTags.serialNumber = in->serial;
3441 // Create new chunk in NAND
3442 newChunkId = yaffs_WriteNewChunkWithTagsToNAND(dev,buffer,&newTags, (prevChunkId >= 0) ? 1 : 0 );
3447 in->chunkId = newChunkId;
3449 if(prevChunkId >= 0)
3451 yaffs_DeleteChunk(dev,prevChunkId,1,__LINE__);
3456 // If this was a shrink, then mark the block that the chunk lives on
3459 bi = yaffs_GetBlockInfo(in->myDev,newChunkId / in->myDev->nChunksPerBlock);
3460 bi->hasShrinkHeader = 1;
3465 retVal = newChunkId;
3470 yaffs_ReleaseTempBuffer(dev,buffer,__LINE__);
3476 /////////////////////// Short Operations Cache ////////////////////////////////
3477 // In many siturations where there is no high level buffering (eg WinCE) a lot of
3478 // reads might be short sequential reads, and a lot of writes may be short
3479 // sequential writes. eg. scanning/writing a jpeg file.
3480 // In these cases, a short read/write cache can provide a huge perfomance benefit
3481 // with dumb-as-a-rock code.
3482 // There are a limited number (~10) of cache chunks per device so that we don't
3483 // need a very intelligent search.
3489 static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
3491 yaffs_Device *dev = obj->myDev;
3494 yaffs_ChunkCache *cache;
3497 int nCaches = obj->myDev->nShortOpCaches;
3504 // Find the dirty cache for this object with the lowest chunk id.
3505 for(i = 0; i < nCaches; i++)
3507 if(dev->srCache[i].object == obj &&
3508 dev->srCache[i].dirty)
3510 if(!cache || dev->srCache[i].chunkId < lowest)
3512 cache = &dev->srCache[i];
3513 lowest = cache->chunkId;
3518 if(cache && !cache->locked)
3520 //Write it out and free it up
3523 nBytes = cache->object->variant.fileVariant.fileSize - ((cache->chunkId -1) * YAFFS_BYTES_PER_CHUNK);
3525 if(nBytes > YAFFS_BYTES_PER_CHUNK)
3527 nBytes= YAFFS_BYTES_PER_CHUNK;
3530 chunkWritten = yaffs_WriteChunkDataToObject(cache->object,
3536 cache->object = NULL;
3539 } while(cache && chunkWritten > 0);
3543 //Hoosterman, disk full while writing cache out.
3544 T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
3552 // Grab us a chunk for use.
3553 // First look for an empty one.
3554 // Then look for the least recently used non-dirty one.
3555 // Then look for the least recently used dirty one...., flush and look again.
3556 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)
3562 if(dev->nShortOpCaches > 0)
3564 for(i = 0; i < dev->nShortOpCaches; i++)
3566 if(!dev->srCache[i].object)
3568 //T(("Grabbing empty %d\n",i));
3570 //printf("Grabbing empty %d\n",i);
3572 return &dev->srCache[i];
3579 usage = 0; // just to stop the compiler grizzling
3581 for(i = 0; i < dev->nShortOpCaches; i++)
3583 if(!dev->srCache[i].dirty &&
3584 ((dev->srCache[i].lastUse < usage && theOne >= 0)||
3587 usage = dev->srCache[i].lastUse;
3592 //T(("Grabbing non-empty %d\n",theOne));
3594 //if(theOne >= 0) printf("Grabbed non-empty cache %d\n",theOne);
3596 return theOne >= 0 ? &dev->srCache[theOne] : NULL;
3606 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
3608 yaffs_ChunkCache *cache;
3609 yaffs_Object *theObj;
3614 if(dev->nShortOpCaches > 0)
3616 // Try find a non-dirty one...
3618 cache = yaffs_GrabChunkCacheWorker(dev);
3622 // They were all dirty, find the last recently used object and flush
3623 // its cache, then find again.
3624 // NB what's here is not very accurate, we actually flush the object
3625 // the last recently used page.
3632 for(i = 0; i < dev->nShortOpCaches; i++)
3634 if( dev->srCache[i].object &&
3635 !dev->srCache[i].locked &&
3636 (dev->srCache[i].lastUse < usage || !cache))
3638 usage = dev->srCache[i].lastUse;
3639 theObj = dev->srCache[i].object;
3640 cache = &dev->srCache[i];
3645 if(!cache || cache->dirty)
3649 yaffs_FlushFilesChunkCache(theObj);
3652 cache = yaffs_GrabChunkCacheWorker(dev);
3656 //printf(" pushout %d\n",pushout);
3669 // Find a cached chunk
3670 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj, int chunkId)
3672 yaffs_Device *dev = obj->myDev;
3674 if(dev->nShortOpCaches > 0)
3676 for(i = 0; i < dev->nShortOpCaches; i++)
3678 if(dev->srCache[i].object == obj &&
3679 dev->srCache[i].chunkId == chunkId)
3683 return &dev->srCache[i];
3690 // Mark the chunk for the least recently used algorithym
3691 static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache, int isAWrite)
3694 if(dev->nShortOpCaches > 0)
3696 if( dev->srLastUse < 0 ||
3697 dev->srLastUse > 100000000)
3699 // Reset the cache usages
3701 for(i = 1; i < dev->nShortOpCaches; i++)
3703 dev->srCache[i].lastUse = 0;
3710 cache->lastUse = dev->srLastUse;
3719 // Invalidate a single cache page.
3720 // Do this when a whole page gets written,
3721 // ie the short cache for this page is no longer valid.
3722 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)
3724 if(object->myDev->nShortOpCaches > 0)
3726 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object,chunkId);
3730 cache->object = NULL;
3736 // Invalidate all the cache pages associated with this object
3737 // Do this whenever ther file is deleted or resized.
3738 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
3741 yaffs_Device *dev = in->myDev;
3743 if(dev->nShortOpCaches > 0)
3745 // Now invalidate it.
3746 for(i = 0; i < dev->nShortOpCaches; i++)
3748 if(dev->srCache[i].object == in)
3750 dev->srCache[i].object = NULL;
3760 ///////////////////////// File read/write ///////////////////////////////
3761 // Read and write have very similar structures.
3762 // In general the read/write has three parts to it
3763 // * An incomplete chunk to start with (if the read/write is not chunk-aligned)
3764 // * Some complete chunks
3765 // * An incomplete chunk to end off with
3767 // Curve-balls: the first chunk might also be the last chunk.
3769 int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 * buffer, __u32 offset, int nBytes)
3778 yaffs_ChunkCache *cache;
3786 chunk = offset / dev->nBytesPerChunk + 1; // The first chunk is 1
3787 start = offset % dev->nBytesPerChunk;
3789 // OK now check for the curveball where the start and end are in
3791 if( (start + n) < dev->nBytesPerChunk)
3797 nToCopy = dev->nBytesPerChunk - start;
3800 cache = yaffs_FindChunkCache(in,chunk);
3802 // If the chunk is already in the cache or it is less than a whole chunk
3803 // then use the cache (if there is caching)
3804 // else bypass the cache.
3805 if( cache || nToCopy != dev->nBytesPerChunk)
3807 if(dev->nShortOpCaches > 0)
3810 // If we can't find the data in the cache, then load it up.
3814 cache = yaffs_GrabChunkCache(in->myDev);
3816 cache->chunkId = chunk;
3819 yaffs_ReadChunkDataFromObject(in,chunk,cache->data);
3823 yaffs_UseChunkCache(dev,cache,0);
3827 #ifdef CONFIG_YAFFS_WINCE
3828 yfsd_UnlockYAFFS(TRUE);
3830 memcpy(buffer,&cache->data[start],nToCopy);
3832 #ifdef CONFIG_YAFFS_WINCE
3833 yfsd_LockYAFFS(TRUE);
3839 // Read into the local buffer then copy...
3841 __u8 *localBuffer = yaffs_GetTempBuffer(dev,__LINE__);
3842 yaffs_ReadChunkDataFromObject(in,chunk,localBuffer);
3843 #ifdef CONFIG_YAFFS_WINCE
3844 yfsd_UnlockYAFFS(TRUE);
3846 memcpy(buffer,&localBuffer[start],nToCopy);
3848 #ifdef CONFIG_YAFFS_WINCE
3849 yfsd_LockYAFFS(TRUE);
3851 yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
3857 #ifdef CONFIG_YAFFS_WINCE
3858 __u8 *localBuffer = yaffs_GetTempBuffer(dev,__LINE__);
3860 // Under WinCE can't do direct transfer. Need to use a local buffer.
3861 // This is because we otherwise screw up WinCE's memory mapper
3862 yaffs_ReadChunkDataFromObject(in,chunk,localBuffer);
3864 #ifdef CONFIG_YAFFS_WINCE
3865 yfsd_UnlockYAFFS(TRUE);
3867 memcpy(buffer,localBuffer,dev->nBytesPerChunk);
3869 #ifdef CONFIG_YAFFS_WINCE
3870 yfsd_LockYAFFS(TRUE);
3871 yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
3875 // A full chunk. Read directly into the supplied buffer.
3876 yaffs_ReadChunkDataFromObject(in,chunk,buffer);
3892 int yaffs_WriteDataToFile(yaffs_Object *in,const __u8 * buffer, __u32 offset, int nBytes)
3901 int startOfWrite = offset;
3902 int chunkWritten = 0;
3910 while(n > 0 && chunkWritten >= 0)
3912 chunk = offset / dev->nBytesPerChunk + 1;
3913 start = offset % dev->nBytesPerChunk;
3916 // OK now check for the curveball where the start and end are in
3919 if( (start + n) < dev->nBytesPerChunk)
3923 // Now folks, to calculate how many bytes to write back....
3924 // If we're overwriting and not writing to then end of file then
3925 // we need to write back as much as was there before.
3927 nBytesRead = in->variant.fileVariant.fileSize - ((chunk -1) * dev->nBytesPerChunk);
3929 if(nBytesRead > dev->nBytesPerChunk)
3931 nBytesRead = dev->nBytesPerChunk;
3934 nToWriteBack = (nBytesRead > (start + n)) ? nBytesRead : (start +n);
3939 nToCopy = dev->nBytesPerChunk - start;
3940 nToWriteBack = dev->nBytesPerChunk;
3943 if(nToCopy != dev->nBytesPerChunk)
3945 // An incomplete start or end chunk (or maybe both start and end chunk)
3946 if(dev->nShortOpCaches > 0)
3948 yaffs_ChunkCache *cache;
3949 // If we can't find the data in the cache, then load it up.
3950 cache = yaffs_FindChunkCache(in,chunk);
3951 if(!cache && yaffs_CheckSpaceForChunkCache(in->myDev))
3953 cache = yaffs_GrabChunkCache(in->myDev);
3955 cache->chunkId = chunk;
3958 yaffs_ReadChunkDataFromObject(in,chunk,cache->data);
3963 yaffs_UseChunkCache(dev,cache,1);
3965 #ifdef CONFIG_YAFFS_WINCE
3966 yfsd_UnlockYAFFS(TRUE);
3969 memcpy(&cache->data[start],buffer,nToCopy);
3971 #ifdef CONFIG_YAFFS_WINCE
3972 yfsd_LockYAFFS(TRUE);
3975 cache->nBytes = nToWriteBack;
3979 chunkWritten = -1; // fail the write
3984 // An incomplete start or end chunk (or maybe both start and end chunk)
3985 // Read into the local buffer then copy, then copy over and write back.
3987 __u8 *localBuffer = yaffs_GetTempBuffer(dev,__LINE__);
3989 yaffs_ReadChunkDataFromObject(in,chunk,localBuffer);
3991 #ifdef CONFIG_YAFFS_WINCE
3992 yfsd_UnlockYAFFS(TRUE);
3995 memcpy(&localBuffer[start],buffer,nToCopy);
3997 #ifdef CONFIG_YAFFS_WINCE
3998 yfsd_LockYAFFS(TRUE);
4000 chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,localBuffer,nToWriteBack,0);
4002 yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
4004 //T(("Write with readback to chunk %d %d start %d copied %d wrote back %d\n",chunk,chunkWritten,start, nToCopy, nToWriteBack));
4011 #ifdef CONFIG_YAFFS_WINCE
4012 // Under WinCE can't do direct transfer. Need to use a local buffer.
4013 // This is because we otherwise screw up WinCE's memory mapper
4014 __u8 *localBuffer = yaffs_GetTempBuffer(dev,__LINE__);
4015 #ifdef CONFIG_YAFFS_WINCE
4016 yfsd_UnlockYAFFS(TRUE);
4018 memcpy(localBuffer,buffer,dev->nBytesPerChunk);
4019 #ifdef CONFIG_YAFFS_WINCE
4020 yfsd_LockYAFFS(TRUE);
4022 chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,localBuffer,dev->nBytesPerChunk,0);
4023 yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
4025 // A full chunk. Write directly from the supplied buffer.
4026 chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,buffer,dev->nBytesPerChunk,0);
4028 // Since we've overwritten the cached data, we better invalidate it.
4029 yaffs_InvalidateChunkCache(in,chunk);
4030 //T(("Write to chunk %d %d\n",chunk,chunkWritten));
4033 if(chunkWritten >= 0)
4043 // Update file object
4045 if((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
4047 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
4055 static void yaffs_PruneResizedChunks(yaffs_Object *in, int newSize)
4058 yaffs_Device *dev = in->myDev;
4059 int oldFileSize = in->variant.fileVariant.fileSize;
4062 int lastDel = 1 + (oldFileSize-1)/dev->nBytesPerChunk;
4064 int startDel = 1 + (newSize + dev->nBytesPerChunk - 1)/
4065 dev->nBytesPerChunk;
4069 // Delete backwards so that we don't end up with holes if
4070 // power is lost part-way through the operation.
4071 for(i = lastDel; i >= startDel; i--)
4073 // NB this could be optimised somewhat,
4074 // eg. could retrieve the tags and write them without
4075 // using yaffs_DeleteChunk
4077 chunkId = yaffs_FindAndDeleteChunkInFile(in,i,NULL);
4080 if(chunkId < (dev->startBlock * dev->nChunksPerBlock) ||
4081 chunkId >= ((dev->endBlock+1) * dev->nChunksPerBlock))
4083 T(YAFFS_TRACE_ALWAYS,("Found daft chunkId %d for %d\n",chunkId,i));
4088 yaffs_DeleteChunk(dev,chunkId,1,__LINE__);
4095 int yaffs_ResizeFile(yaffs_Object *in, int newSize)
4098 int oldFileSize = in->variant.fileVariant.fileSize;
4099 int sizeOfPartialChunk;
4100 yaffs_Device *dev = in->myDev;
4102 sizeOfPartialChunk = newSize % dev->nBytesPerChunk;
4105 yaffs_FlushFilesChunkCache(in);
4106 yaffs_InvalidateWholeChunkCache(in);
4108 yaffs_CheckGarbageCollection(dev);
4110 if(in->variantType != YAFFS_OBJECT_TYPE_FILE)
4112 return yaffs_GetFileSize(in);
4115 if(newSize < oldFileSize)
4118 yaffs_PruneResizedChunks(in,newSize);
4120 if(sizeOfPartialChunk != 0)
4122 int lastChunk = 1+ newSize/dev->nBytesPerChunk;
4123 __u8 *localBuffer = yaffs_GetTempBuffer(dev,__LINE__);
4125 // Got to read and rewrite the last chunk with its new size and zero pad
4126 yaffs_ReadChunkDataFromObject(in,lastChunk,localBuffer);
4128 memset(localBuffer + sizeOfPartialChunk,0, dev->nBytesPerChunk - sizeOfPartialChunk);
4130 yaffs_WriteChunkDataToObject(in,lastChunk,localBuffer,sizeOfPartialChunk,1);
4132 yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
4135 in->variant.fileVariant.fileSize = newSize;
4137 yaffs_PruneFileStructure(dev,&in->variant.fileVariant);
4139 // TODO write a new object header to show we've shrunk the file
4140 // Do this only if the file is not in the deleted directory.
4141 if(in->parent->objectId != YAFFS_OBJECTID_UNLINKED)
4143 yaffs_UpdateObjectHeader(in,NULL, 0, 1);
4157 loff_t yaffs_GetFileSize(yaffs_Object *obj)
4159 obj = yaffs_GetEquivalentObject(obj);
4161 switch(obj->variantType)
4163 case YAFFS_OBJECT_TYPE_FILE:
4164 return obj->variant.fileVariant.fileSize;
4165 case YAFFS_OBJECT_TYPE_SYMLINK:
4166 return yaffs_strlen(obj->variant.symLinkVariant.alias);
4174 // yaffs_FlushFile() updates the file's
4177 int yaffs_FlushFile(yaffs_Object *in, int updateTime)
4182 //T(("flushing object header\n"));
4184 yaffs_FlushFilesChunkCache(in);
4187 #ifdef CONFIG_YAFFS_WINCE
4188 yfsd_WinFileTimeNow(in->win_mtime);
4191 in->st_mtime = Y_CURRENT_TIME;
4196 retVal = (yaffs_UpdateObjectHeader(in,NULL,0,0) >= 0)? YAFFS_OK : YAFFS_FAIL;
4208 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
4211 // First off, invalidate the file's data in the cache, without flushing.
4212 yaffs_InvalidateWholeChunkCache(in);
4214 if(in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir))
4216 // Move to the unlinked directory so we have a record that it was deleted.
4217 yaffs_ChangeObjectName(in, in->myDev->deletedDir,NULL,0);
4222 yaffs_RemoveObjectFromDirectory(in);
4223 yaffs_DeleteChunk(in->myDev,in->chunkId,1,__LINE__);
4229 in->myInode->u.generic_ip = NULL;
4233 yaffs_FreeObject(in);
4238 // yaffs_DeleteFile deletes the whole file data
4239 // and the inode associated with the file.
4240 // It does not delete the links associated with the file.
4241 static int yaffs_UnlinkFile(yaffs_Object *in)
4244 #ifdef CONFIG_YAFFS_DISABLE_BACKGROUND_DELETION
4246 // Delete the file data & tnodes
4248 yaffs_DeleteWorker(in, in->variant.fileVariant.top, in->variant.fileVariant.topLevel, 0,NULL);
4251 yaffs_FreeTnode(in->myDev,in->variant.fileVariant.top);
4253 return yaffs_DoGenericObjectDeletion(in);
4256 int immediateDeletion=0;
4261 //in->myDev->nUnlinkedFiles++;
4262 //in->renameAllowed = 0;
4266 immediateDeletion = 1;
4272 immediateDeletion = 1;
4276 if(immediateDeletion)
4278 retVal = yaffs_ChangeObjectName(in, in->myDev->deletedDir,NULL,0);
4279 T(YAFFS_TRACE_TRACING,(TSTR("yaffs: immediate deletion of file %d" TENDSTR),in->objectId));
4281 in->myDev->nDeletedFiles++;
4282 yaffs_SoftDeleteFile(in);
4286 retVal = yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,NULL,0);
4296 int yaffs_DeleteFile(yaffs_Object *in)
4298 int retVal = YAFFS_OK;
4300 if(in->nDataChunks > 0)
4302 // Use soft deletion
4305 retVal = yaffs_UnlinkFile(in);
4307 if(retVal == YAFFS_OK &&
4312 in->myDev->nDeletedFiles++;
4313 yaffs_SoftDeleteFile(in);
4315 return in->deleted ? YAFFS_OK : YAFFS_FAIL;
4319 // The file has no data chunks so we toss it immediately
4320 yaffs_FreeTnode(in->myDev,in->variant.fileVariant.top);
4321 in->variant.fileVariant.top = NULL;
4322 yaffs_DoGenericObjectDeletion(in);
4328 static int yaffs_DeleteDirectory(yaffs_Object *in)
4330 //First check that the directory is empty.
4331 if(list_empty(&in->variant.directoryVariant.children))
4333 return yaffs_DoGenericObjectDeletion(in);
4340 static int yaffs_DeleteSymLink(yaffs_Object *in)
4342 YFREE(in->variant.symLinkVariant.alias);
4344 return yaffs_DoGenericObjectDeletion(in);
4347 static int yaffs_DeleteHardLink(yaffs_Object *in)
4349 // remove this hardlink from the list assocaited with the equivalent
4351 list_del(&in->hardLinks);
4352 return yaffs_DoGenericObjectDeletion(in);
4356 static void yaffs_DestroyObject(yaffs_Object *obj)
4358 switch(obj->variantType)
4360 case YAFFS_OBJECT_TYPE_FILE: yaffs_DeleteFile(obj); break;
4361 case YAFFS_OBJECT_TYPE_DIRECTORY: yaffs_DeleteDirectory(obj); break;
4362 case YAFFS_OBJECT_TYPE_SYMLINK: yaffs_DeleteSymLink(obj); break;
4363 case YAFFS_OBJECT_TYPE_HARDLINK: yaffs_DeleteHardLink(obj); break;
4364 case YAFFS_OBJECT_TYPE_SPECIAL: yaffs_DoGenericObjectDeletion(obj); break;
4365 case YAFFS_OBJECT_TYPE_UNKNOWN: break; // should not happen.
4370 static int yaffs_UnlinkWorker(yaffs_Object *obj)
4374 if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4376 return yaffs_DeleteHardLink(obj);
4378 else if(!list_empty(&obj->hardLinks))
4380 // Curve ball: We're unlinking an object that has a hardlink.
4382 // This problem arises because we are not strictly following
4383 // The Linux link/inode model.
4385 // We can't really delete the object.
4386 // Instead, we do the following:
4387 // - Select a hardlink.
4388 // - Unhook it from the hard links
4389 // - Unhook it from its parent directory (so that the rename can work)
4390 // - Rename the object to the hardlink's name.
4391 // - Delete the hardlink
4396 YCHAR name[YAFFS_MAX_NAME_LENGTH+1];
4398 hl = list_entry(obj->hardLinks.next,yaffs_Object,hardLinks);
4400 list_del_init(&hl->hardLinks);
4401 list_del_init(&hl->siblings);
4403 yaffs_GetObjectName(hl,name,YAFFS_MAX_NAME_LENGTH+1);
4405 retVal = yaffs_ChangeObjectName(obj, hl->parent, name,0);
4407 if(retVal == YAFFS_OK)
4409 retVal = yaffs_DoGenericObjectDeletion(hl);
4416 switch(obj->variantType)
4418 case YAFFS_OBJECT_TYPE_FILE:
4419 return yaffs_UnlinkFile(obj);
4421 case YAFFS_OBJECT_TYPE_DIRECTORY:
4422 return yaffs_DeleteDirectory(obj);
4424 case YAFFS_OBJECT_TYPE_SYMLINK:
4425 return yaffs_DeleteSymLink(obj);
4427 case YAFFS_OBJECT_TYPE_HARDLINK:
4428 case YAFFS_OBJECT_TYPE_UNKNOWN:
4435 int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name)
4439 obj = yaffs_FindObjectByName(dir,name);
4441 if(obj && obj->unlinkAllowed)
4443 return yaffs_UnlinkWorker(obj);
4450 //////////////// Initialisation Scanning /////////////////
4454 // For now we use the SmartMedia check.
4455 // We look at the blockStatus byte in the first two chunks
4456 // These must be 0xFF to pass as OK.
4457 // todo: this function needs to be modifyable foir different NAND types
4458 // and different chunk sizes. Suggest make this into a per-device configurable
4460 static int yaffs_IsBlockBad(yaffs_Device *dev, int blk)
4462 yaffsExtendedTags *tags;
4464 yaffs_ReadChunkFromNAND(dev,blk * dev->nChunksPerBlock,NULL,&tags,1);
4466 if(yaffs_CountBits(spare.blockStatus) < 7)
4471 if(spare.blockStatus != 0xFF)
4476 yaffs_ReadChunkFromNAND(dev,blk * dev->nChunksPerBlock + 1,NULL,&spare,1);
4479 if(yaffs_CountBits(spare.blockStatus) < 7)
4484 if(spare.blockStatus != 0xFF)
4505 static int yaffs_Scan(yaffs_Device *dev)
4507 yaffs_ExtendedTags tags;
4512 int nBlocksToScan = 0;
4517 yaffs_BlockState state;
4518 yaffs_Object *hardList = NULL;
4520 yaffs_BlockInfo *bi;
4522 yaffs_ObjectHeader *oh;
4524 yaffs_Object *parent;
4525 int nBlocks = dev->endBlock - dev->startBlock + 1;
4529 yaffs_BlockIndex *blockIndex = NULL;
4531 T(YAFFS_TRACE_SCAN,(TSTR("yaffs_Scan starts startblk %d endblk %d..." TENDSTR),dev->startBlock,dev->endBlock));
4533 chunkData = yaffs_GetTempBuffer(dev,__LINE__);
4536 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
4540 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
4544 // Scan all the blocks to determine their state
4545 for(blk = dev->startBlock; blk <= dev->endBlock; blk++)
4547 bi = yaffs_GetBlockInfo(dev,blk);
4548 yaffs_ClearChunkBits(dev,blk);
4550 bi->softDeletions = 0;
4552 yaffs_QueryInitialBlockState(dev,blk,&state,&sequenceNumber);
4554 bi->blockState = state;
4555 bi->sequenceNumber = sequenceNumber;
4557 T(YAFFS_TRACE_SCAN_DEBUG,(TSTR("Block scanning block %d state %d seq %d" TENDSTR),blk,state,sequenceNumber));
4559 if(state == YAFFS_BLOCK_STATE_DEAD)
4561 T(YAFFS_TRACE_BAD_BLOCKS,(TSTR("block %d is bad" TENDSTR),blk));
4563 else if(state == YAFFS_BLOCK_STATE_EMPTY)
4565 T(YAFFS_TRACE_SCAN_DEBUG,(TSTR("Block empty " TENDSTR)));
4566 dev->nErasedBlocks++;
4567 dev->nFreeChunks += dev->nChunksPerBlock;
4569 else if(state == YAFFS_BLOCK_STATE_NEEDS_SCANNING)
4572 // Determine the highest sequence number
4573 if( dev->isYaffs2 &&
4574 sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
4575 sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER)
4578 blockIndex[nBlocksToScan].seq = sequenceNumber;
4579 blockIndex[nBlocksToScan].block = blk;
4583 if(sequenceNumber >= dev->sequenceNumber)
4585 dev->sequenceNumber = sequenceNumber;
4588 else if(dev->isYaffs2)
4590 // TODO: Nasty sequence number!
4591 T(YAFFS_TRACE_SCAN,(TSTR("Block scanning block %d has bad sequence number %d" TENDSTR),blk,sequenceNumber));
4598 // Dungy old bubble sort for now...
4601 yaffs_BlockIndex temp;
4605 for(i = 0; i < nBlocksToScan; i++)
4606 for(j = i+1; j < nBlocksToScan; j++)
4607 if(blockIndex[i].seq > blockIndex[j].seq)
4609 temp = blockIndex[j];
4610 blockIndex[j] = blockIndex[i];
4611 blockIndex[i] = temp;
4616 // Now scan the blocks looking at the data.
4620 endIterator = nBlocksToScan-1;
4621 T(YAFFS_TRACE_SCAN_DEBUG,(TSTR("%d blocks to be scanned" TENDSTR),nBlocksToScan));
4625 startIterator = dev->startBlock;
4626 endIterator = dev->endBlock;
4629 for(blockIterator = startIterator; blockIterator <= endIterator; blockIterator++)
4634 // get the block to scan in the correct order
4635 blk = blockIndex[blockIterator].block;
4639 blk = blockIterator;
4643 bi = yaffs_GetBlockInfo(dev,blk);
4644 state = bi->blockState;
4648 for(c = 0; c < dev->nChunksPerBlock &&
4649 state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++)
4651 // Read the tags and decide what to do
4652 chunk = blk * dev->nChunksPerBlock + c;
4654 yaffs_ReadChunkWithTagsFromNAND(dev,chunk,NULL,&tags);
4656 // Let's have a good look at this chunk...
4659 if(!dev->isYaffs2 && tags.chunkDeleted)
4663 dev->nFreeChunks ++;
4664 //T((" %d %d deleted\n",blk,c));
4666 else if(!tags.chunkUsed)
4668 // An unassigned chunk in the block
4669 // This means that either the block is empty or
4670 // this is the one being allocated from
4674 // We're looking at the first chunk in the block so the block is unused
4675 state = YAFFS_BLOCK_STATE_EMPTY;
4676 dev->nErasedBlocks++;
4680 // this is the block being allocated from
4681 T(YAFFS_TRACE_SCAN,(TSTR(" Allocating from %d %d" TENDSTR),blk,c));
4682 state = YAFFS_BLOCK_STATE_ALLOCATING;
4683 dev->allocationBlock = blk;
4684 dev->allocationPage = c;
4685 dev->allocationBlockFinder = blk; // Set it to here to encourage the allocator to
4686 // go forth from here.
4687 //Yaffs2 sanity check:
4688 // This should be the one with the highest sequence number
4689 if(dev->isYaffs2 && (dev->sequenceNumber != bi->sequenceNumber))
4691 T(YAFFS_TRACE_ALWAYS,
4692 (TSTR("yaffs: Allocation block %d was not highest sequence id: block seq = %d, dev seq = %d" TENDSTR),
4693 blk,bi->sequenceNumber,dev->sequenceNumber));
4697 dev->nFreeChunks += (dev->nChunksPerBlock - c);
4699 else if(tags.chunkId > 0)
4703 yaffs_SetChunkBit(dev,blk,c);
4706 in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,YAFFS_OBJECT_TYPE_FILE);
4707 // PutChunkIntoFIle checks for a clash (two data chunks with
4708 // the same chunkId).
4709 yaffs_PutChunkIntoFile(in,tags.chunkId,chunk,1);
4710 endpos = (tags.chunkId - 1)* dev->nBytesPerChunk + tags.byteCount;
4711 if(in->variant.fileVariant.scannedFileSize <endpos)
4713 in->variant.fileVariant.scannedFileSize = endpos;
4714 if(!dev->useHeaderFileSize)
4716 in->variant.fileVariant.fileSize =
4717 in->variant.fileVariant.scannedFileSize;
4721 //T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId));
4725 // chunkId == 0, so it is an ObjectHeader.
4726 // Thus, we read in the object header and make the object
4727 yaffs_SetChunkBit(dev,blk,c);
4730 yaffs_ReadChunkWithTagsFromNAND(dev,chunk,chunkData,NULL);
4732 oh = (yaffs_ObjectHeader *)chunkData;
4734 in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,oh->type);
4738 // We have already filled this one. We have a duplicate and need to resolve it.
4740 unsigned existingSerial = in->serial;
4741 unsigned newSerial = tags.serialNumber;
4743 if( dev->isYaffs2 ||
4744 ((existingSerial+1) & 3) == newSerial)
4746 // Use new one - destroy the exisiting one
4747 yaffs_DeleteChunk(dev,in->chunkId,1,__LINE__);
4752 // Use existing - destroy this one.
4753 yaffs_DeleteChunk(dev,chunk,1,__LINE__);
4758 (tags.objectId == YAFFS_OBJECTID_ROOT ||
4759 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))
4761 // We only load some info, don't fiddle with directory structure
4763 in->variantType = oh->type;
4765 in->st_mode = oh->st_mode;
4766 #ifdef CONFIG_YAFFS_WINCE
4767 in->win_atime[0] = oh->win_atime[0];
4768 in->win_ctime[0] = oh->win_ctime[0];
4769 in->win_mtime[0] = oh->win_mtime[0];
4770 in->win_atime[1] = oh->win_atime[1];
4771 in->win_ctime[1] = oh->win_ctime[1];
4772 in->win_mtime[1] = oh->win_mtime[1];
4774 in->st_uid = oh->st_uid;
4775 in->st_gid = oh->st_gid;
4776 in->st_atime = oh->st_atime;
4777 in->st_mtime = oh->st_mtime;
4778 in->st_ctime = oh->st_ctime;
4779 in->st_rdev = oh->st_rdev;
4781 in->chunkId = chunk;
4786 // we need to load this info
4789 in->variantType = oh->type;
4791 in->st_mode = oh->st_mode;
4792 #ifdef CONFIG_YAFFS_WINCE
4793 in->win_atime[0] = oh->win_atime[0];
4794 in->win_ctime[0] = oh->win_ctime[0];
4795 in->win_mtime[0] = oh->win_mtime[0];
4796 in->win_atime[1] = oh->win_atime[1];
4797 in->win_ctime[1] = oh->win_ctime[1];
4798 in->win_mtime[1] = oh->win_mtime[1];
4800 in->st_uid = oh->st_uid;
4801 in->st_gid = oh->st_gid;
4802 in->st_atime = oh->st_atime;
4803 in->st_mtime = oh->st_mtime;
4804 in->st_ctime = oh->st_ctime;
4805 in->st_rdev = oh->st_rdev;
4807 in->chunkId = chunk;
4809 yaffs_SetObjectName(in,oh->name);
4812 // directory stuff...
4813 // hook up to parent
4815 parent = yaffs_FindOrCreateObjectByNumber(dev,oh->parentObjectId,YAFFS_OBJECT_TYPE_DIRECTORY);
4816 if(parent->variantType == YAFFS_OBJECT_TYPE_UNKNOWN)
4818 // Set up as a directory
4819 parent->variantType = YAFFS_OBJECT_TYPE_DIRECTORY;
4820 INIT_LIST_HEAD(&parent->variant.directoryVariant.children);
4822 else if(parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
4824 // Hoosterman, another problem....
4825 // We're trying to use a non-directory as a directory
4827 T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found." TENDSTR)));
4828 parent = dev->lostNFoundDir;
4831 yaffs_AddObjectToDirectory(parent,in);
4833 if(0 && (parent == dev->deletedDir ||
4834 parent == dev->unlinkedDir))
4836 in->deleted = 1; // If it is unlinked at start up then it wants deleting
4837 dev->nDeletedFiles++;
4840 // Note re hardlinks.
4841 // Since we might scan a hardlink before its equivalent object is scanned
4842 // we put them all in a list.
4843 // After scanning is complete, we should have all the objects, so we run through this
4844 // list and fix up all the chains.
4846 switch(in->variantType)
4848 case YAFFS_OBJECT_TYPE_UNKNOWN: // Todo got a problem
4850 case YAFFS_OBJECT_TYPE_FILE:
4851 if(dev->isYaffs2 && oh->isShrink)
4853 // Prune back the shrunken chunks
4854 yaffs_PruneResizedChunks(in,oh->fileSize);
4855 // Mark the block as having a shrinkHeader
4856 bi->hasShrinkHeader = 1;
4859 if(dev->useHeaderFileSize)
4860 in->variant.fileVariant.fileSize = oh->fileSize;
4863 case YAFFS_OBJECT_TYPE_HARDLINK:
4864 in->variant.hardLinkVariant.equivalentObjectId = oh->equivalentObjectId;
4865 in->hardLinks.next = (struct list_head *)hardList;
4868 case YAFFS_OBJECT_TYPE_DIRECTORY: // Do nothing
4870 case YAFFS_OBJECT_TYPE_SPECIAL: // Do nothing
4872 case YAFFS_OBJECT_TYPE_SYMLINK: // Do nothing
4873 in->variant.symLinkVariant.alias = yaffs_CloneString(oh->alias);
4877 if(parent == dev->deletedDir)
4879 yaffs_DestroyObject(in);
4880 bi->hasShrinkHeader = 1;
4882 //T((" %d %d header %d \"%s\" type %d\n",blk,c,tags.objectId,oh->name,in->variantType));
4887 if(state == YAFFS_BLOCK_STATE_NEEDS_SCANNING)
4889 // If we got this far while scanning, then the block is fully allocated.
4890 state = YAFFS_BLOCK_STATE_FULL;
4893 bi->blockState = state;
4895 // Now let's see if it was dirty
4896 if( bi->pagesInUse == 0 &&
4897 !bi->hasShrinkHeader &&
4898 bi->blockState == YAFFS_BLOCK_STATE_FULL)
4900 yaffs_BlockBecameDirty(dev,blk);
4910 // Ok, we've done all the scanning.
4912 // Fix up the hard link chains.
4913 // We should now have scanned all the objects, now it's time to add these
4918 hardList = (yaffs_Object *)(hardList->hardLinks.next);
4920 in = yaffs_FindObjectByNumber(dev,hl->variant.hardLinkVariant.equivalentObjectId);
4924 // Add the hardlink pointers
4925 hl->variant.hardLinkVariant.equivalentObject=in;
4926 list_add(&hl->hardLinks,&in->hardLinks);
4930 //Todo Need to report/handle this better.
4931 // Got a problem... hardlink to a non-existant object
4932 hl->variant.hardLinkVariant.equivalentObject=NULL;
4933 INIT_LIST_HEAD(&hl->hardLinks);
4940 struct list_head *i;
4941 struct list_head *n;
4944 // Soft delete all the unlinked files
4945 list_for_each_safe(i,n,&dev->unlinkedDir->variant.directoryVariant.children)
4949 l = list_entry(i, yaffs_Object,siblings);
4952 yaffs_DestroyObject(l);
4958 yaffs_ReleaseTempBuffer(dev,chunkData,__LINE__);
4960 T(YAFFS_TRACE_SCAN,(TSTR("yaffs_Scan ends" TENDSTR)));
4967 ////////////////////////// Directory Functions /////////////////////////
4970 static void yaffs_AddObjectToDirectory(yaffs_Object *directory, yaffs_Object *obj)
4973 if(obj->siblings.prev == NULL)
4976 INIT_LIST_HEAD(&obj->siblings);
4979 else if(!list_empty(&obj->siblings))
4981 // If it is holed up somewhere else, un hook it
4982 list_del_init(&obj->siblings);
4985 list_add(&obj->siblings,&directory->variant.directoryVariant.children);
4986 obj->parent = directory;
4988 if(directory == obj->myDev->unlinkedDir || directory == obj->myDev->deletedDir)
4991 obj->myDev->nUnlinkedFiles++;
4992 obj->renameAllowed = 0;
4996 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
4998 list_del_init(&obj->siblings);
5002 yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,const YCHAR *name)
5006 struct list_head *i;
5007 YCHAR buffer[YAFFS_MAX_NAME_LENGTH+1];
5011 sum = yaffs_CalcNameSum(name);
5013 list_for_each(i,&directory->variant.directoryVariant.children)
5017 l = list_entry(i, yaffs_Object,siblings);
5019 // Special case for lost-n-found
5020 if(l->objectId == YAFFS_OBJECTID_LOSTNFOUND)
5022 if(yaffs_strcmp(name,YAFFS_LOSTNFOUND_NAME) == 0)
5027 else if(yaffs_SumCompare(l->sum, sum)||
5028 l->chunkId <= 0) //LostnFound cunk called Objxxx
5031 yaffs_GetObjectName(l,buffer,YAFFS_MAX_NAME_LENGTH);
5032 if(yaffs_strcmp(name,buffer) == 0)
5045 int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,int (*fn)(yaffs_Object *))
5047 struct list_head *i;
5051 list_for_each(i,&theDir->variant.directoryVariant.children)
5055 l = list_entry(i, yaffs_Object,siblings);
5068 // GetEquivalentObject dereferences any hard links to get to the
5071 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj)
5073 if(obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
5075 // We want the object id of the equivalent object, not this one
5076 obj = obj->variant.hardLinkVariant.equivalentObject;
5082 int yaffs_GetObjectName(yaffs_Object *obj,YCHAR *name,int buffSize)
5084 memset(name,0,buffSize * sizeof(YCHAR));
5086 if(obj->objectId == YAFFS_OBJECTID_LOSTNFOUND)
5088 yaffs_strncpy(name,YAFFS_LOSTNFOUND_NAME,buffSize - 1);
5090 else if(obj->chunkId <= 0)
5094 yaffs_sprintf(locName,_Y("%s%d"),YAFFS_LOSTNFOUND_PREFIX,obj->objectId);
5095 yaffs_strncpy(name,locName,buffSize - 1);
5098 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
5099 else if(obj->shortName[0])
5101 yaffs_strcpy(name,obj->shortName);
5106 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev,__LINE__);
5108 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer;
5110 memset(buffer,0,obj->myDev->nBytesPerChunk);
5112 if(obj->chunkId >= 0)
5114 yaffs_ReadChunkWithTagsFromNAND(obj->myDev,obj->chunkId,buffer,NULL);
5116 yaffs_strncpy(name,oh->name,buffSize - 1);
5118 yaffs_ReleaseTempBuffer(obj->myDev,buffer,__LINE__);
5121 return yaffs_strlen(name);
5124 int yaffs_GetObjectFileLength(yaffs_Object *obj)
5127 // Dereference any hard linking
5128 obj = yaffs_GetEquivalentObject(obj);
5130 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
5132 return obj->variant.fileVariant.fileSize;
5134 if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
5136 return yaffs_strlen(obj->variant.symLinkVariant.alias);
5140 // Only a directory should drop through to here
5141 return obj->myDev->nBytesPerChunk;
5145 int yaffs_GetObjectLinkCount(yaffs_Object *obj)
5148 struct list_head *i;
5152 count++; // the object itself
5154 list_for_each(i,&obj->hardLinks)
5156 count++; // add the hard links;
5163 int yaffs_GetObjectInode(yaffs_Object *obj)
5165 obj = yaffs_GetEquivalentObject(obj);
5167 return obj->objectId;
5170 unsigned yaffs_GetObjectType(yaffs_Object *obj)
5172 obj = yaffs_GetEquivalentObject(obj);
5174 switch(obj->variantType)
5176 case YAFFS_OBJECT_TYPE_FILE: return DT_REG; break;
5177 case YAFFS_OBJECT_TYPE_DIRECTORY: return DT_DIR; break;
5178 case YAFFS_OBJECT_TYPE_SYMLINK: return DT_LNK; break;
5179 case YAFFS_OBJECT_TYPE_HARDLINK: return DT_REG; break;
5180 case YAFFS_OBJECT_TYPE_SPECIAL:
5181 if(S_ISFIFO(obj->st_mode)) return DT_FIFO;
5182 if(S_ISCHR(obj->st_mode)) return DT_CHR;
5183 if(S_ISBLK(obj->st_mode)) return DT_BLK;
5184 if(S_ISSOCK(obj->st_mode)) return DT_SOCK;
5185 default: return DT_REG; break;
5189 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object *obj)
5191 obj = yaffs_GetEquivalentObject(obj);
5192 if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
5194 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
5198 return yaffs_CloneString(_Y(""));
5202 #ifndef CONFIG_YAFFS_WINCE
5204 int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr)
5206 unsigned int valid = attr->ia_valid;
5208 if(valid & ATTR_MODE) obj->st_mode = attr->ia_mode;
5209 if(valid & ATTR_UID) obj->st_uid = attr->ia_uid;
5210 if(valid & ATTR_GID) obj->st_gid = attr->ia_gid;
5212 if(valid & ATTR_ATIME) obj->st_atime = Y_TIME_CONVERT(attr->ia_atime);
5213 if(valid & ATTR_CTIME) obj->st_ctime = Y_TIME_CONVERT(attr->ia_ctime);
5214 if(valid & ATTR_MTIME) obj->st_mtime = Y_TIME_CONVERT(attr->ia_mtime);
5216 if(valid & ATTR_SIZE) yaffs_ResizeFile(obj,attr->ia_size);
5218 yaffs_UpdateObjectHeader(obj,NULL,1,0);
5223 int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr)
5225 unsigned int valid = 0;
5227 attr->ia_mode = obj->st_mode; valid |= ATTR_MODE;
5228 attr->ia_uid = obj->st_uid; valid |= ATTR_UID;
5229 attr->ia_gid = obj->st_gid; valid |= ATTR_GID;
5231 Y_TIME_CONVERT(attr->ia_atime)= obj->st_atime; valid |= ATTR_ATIME;
5232 Y_TIME_CONVERT(attr->ia_ctime) = obj->st_ctime; valid |= ATTR_CTIME;
5233 Y_TIME_CONVERT(attr->ia_mtime) = obj->st_mtime; valid |= ATTR_MTIME;
5235 attr->ia_size = yaffs_GetFileSize(obj); valid |= ATTR_SIZE;
5237 attr->ia_valid = valid;
5245 int yaffs_DumpObject(yaffs_Object *obj)
5247 // __u8 buffer[YAFFS_BYTES_PER_CHUNK];
5249 // yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer;
5251 // memset(buffer,0,YAFFS_BYTES_PER_CHUNK);
5253 // if(obj->chunkId >= 0)
5255 // yaffs_ReadChunkFromNAND(obj->myDev,obj->chunkId,buffer,NULL);
5258 yaffs_GetObjectName(obj,name,256);
5260 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),
5261 obj->objectId,yaffs_GetObjectInode(obj), name, obj->dirty, obj->valid, obj->serial,
5262 obj->sum, obj->chunkId, yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
5265 YPRINTF(("Object %d \"%s\"\n dirty %d valid %d serial %d sum %d chunk %d\n",
5266 obj->objectId, oh->name, obj->dirty, obj->valid, obj->serial,
5267 obj->sum, obj->chunkId));
5268 switch(obj->variantType)
5270 case YAFFS_OBJECT_TYPE_FILE:
5271 YPRINTF((" FILE length %d\n",obj->variant.fileVariant.fileSize));
5273 case YAFFS_OBJECT_TYPE_DIRECTORY:
5274 YPRINTF((" DIRECTORY\n"));
5276 case YAFFS_OBJECT_TYPE_HARDLINK: //todo
5277 case YAFFS_OBJECT_TYPE_SYMLINK:
5278 case YAFFS_OBJECT_TYPE_UNKNOWN:
5287 ///////////////////////// Initialisation code ///////////////////////////
5290 int yaffs_CheckDevFunctions(const yaffs_Device *dev)
5293 // Common functions, gotta have
5294 if(!dev->eraseBlockInNAND ||
5295 !dev->initialiseNAND) return 0;
5297 #ifdef CONFIG_YAFFS_YAFFS2
5299 // Can use the "with tags" style interface for yaffs1 or yaffs2
5300 if(dev->writeChunkWithTagsToNAND &&
5301 dev->readChunkWithTagsFromNAND &&
5302 !dev->writeChunkToNAND &&
5303 !dev->readChunkFromNAND &&
5304 dev->markNANDBlockBad &&
5305 dev->queryNANDBlock) return 1;
5308 // Can use the "spare" style interface for yaffs1
5309 if(!dev->isYaffs2 &&
5310 !dev->writeChunkWithTagsToNAND &&
5311 !dev->readChunkWithTagsFromNAND &&
5312 dev->writeChunkToNAND &&
5313 dev->readChunkFromNAND &&
5314 !dev->markNANDBlockBad &&
5315 !dev->queryNANDBlock) return 1;
5321 int yaffs_GutsInitialise(yaffs_Device *dev)
5328 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
5329 // Check stuff that must be set
5333 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: Need a device" TENDSTR)));
5337 // Check geometry parameters.
5339 if( (dev->isYaffs2 && dev->nBytesPerChunk <1024) ||
5340 (!dev->isYaffs2 && dev->nBytesPerChunk !=512) ||
5341 dev->nChunksPerBlock < 2 ||
5342 dev->nReservedBlocks < 2 ||
5343 dev->startBlock <= 0 ||
5344 dev->endBlock <= 0 ||
5345 dev->endBlock <= (dev->startBlock + dev->nReservedBlocks + 2) // otherwise it is too small
5348 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s " TENDSTR),
5349 dev->nBytesPerChunk, dev->isYaffs2 ? "2" : ""));
5353 if(yaffs_InitialiseNAND(dev) != YAFFS_OK)
5355 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
5359 // Got the right mix of functions?
5361 if(!yaffs_CheckDevFunctions(dev))
5364 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: device function(s) missing or wrong\n" TENDSTR)));
5369 // This is really a compilation check.
5370 if(!yaffs_CheckStructures())
5372 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
5378 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: device already mounted\n" TENDSTR)));
5384 // Finished with most checks. One or two more checks happen later on too.
5390 nBlocks = dev->endBlock - dev->startBlock + 1;
5394 // OK now calculate a few things for the device
5395 // Calculate chunkGroupBits.
5396 // We need to find the next power of 2 > than endBlock
5398 x = dev->nChunksPerBlock * (dev->endBlock+1);
5400 for(bits = extraBits = 0; x > 1; bits++)
5402 if(x & 1) extraBits++;
5406 if(extraBits > 0) bits++;
5409 // Level0 Tnodes are 16 bits, so if the bitwidth of the
5410 // chunk range we're using is greater than 16 we need
5411 // to figure out chunk shift and chunkGroupSize
5414 dev->chunkGroupBits = 0;
5418 dev->chunkGroupBits = bits - 16;
5421 dev->chunkGroupSize = 1 << dev->chunkGroupBits;
5423 if(dev->nChunksPerBlock < dev->chunkGroupSize)
5425 // We have a problem because the soft delete won't work if
5426 // the chunk group size > chunks per block.
5427 // This can be remedied by using larger "virtual blocks".
5428 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: chunk group too large\n" TENDSTR)));
5434 // OK, we've finished verifying the device, lets continue with initialisation
5436 // More device initialisation
5437 dev->garbageCollections = 0;
5438 dev->passiveGarbageCollections = 0;
5439 dev->currentDirtyChecker = 0;
5440 dev->bufferedBlock = -1;
5441 dev->doingBufferedBlockRewrite = 0;
5442 dev->nDeletedFiles = 0;
5443 dev->nBackgroundDeletions=0;
5444 dev->nUnlinkedFiles = 0;
5447 dev->tagsEccFixed=0;
5448 dev->tagsEccUnfixed=0;
5449 dev->nErasureFailures = 0;
5451 //dev->localBuffer = YMALLOC(dev->nBytesPerChunk);
5452 // Initialise temporary buffers
5455 for(i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
5457 dev->tempBuffer[i].line = 0; // not in use
5458 dev->tempBuffer[i].buffer = YMALLOC(dev->nBytesPerChunk);
5464 yaffs_InitialiseBlocks(dev,nBlocks);
5466 yaffs_InitialiseTnodes(dev);
5468 yaffs_InitialiseObjects(dev);
5470 dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
5472 if(dev->nShortOpCaches > 0)
5476 if(dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES)
5478 dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
5481 dev->srCache = YMALLOC( dev->nShortOpCaches * sizeof(yaffs_ChunkCache));
5483 for(i=0; i < dev->nShortOpCaches; i++)
5485 dev->srCache[i].object = NULL;
5486 dev->srCache[i].lastUse = 0;
5487 dev->srCache[i].dirty = 0;
5488 dev->srCache[i].data = YMALLOC(dev->nBytesPerChunk);
5496 // Initialise the unlinked, root and lost and found directories
5497 dev->lostNFoundDir = dev->rootDir = dev->unlinkedDir = dev->deletedDir = NULL;
5499 dev->unlinkedDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_UNLINKED, S_IFDIR);
5500 dev->deletedDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_UNLINKED, S_IFDIR);
5502 dev->rootDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_ROOT,YAFFS_ROOT_MODE | S_IFDIR);
5503 dev->lostNFoundDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_LOSTNFOUND,YAFFS_LOSTNFOUND_MODE | S_IFDIR);
5504 yaffs_AddObjectToDirectory(dev->rootDir,dev->lostNFoundDir);
5508 dev->useHeaderFileSize = 1;
5511 // Now scan the flash.
5515 dev->nPageReads = 0;
5516 dev->nPageWrites = 0;
5517 dev->nBlockErasures = 0;
5519 dev->nRetriedWrites = 0;
5521 dev->nRetiredBlocks = 0;
5523 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
5528 void yaffs_Deinitialise(yaffs_Device *dev)
5534 yaffs_DeinitialiseBlocks(dev);
5535 yaffs_DeinitialiseTnodes(dev);
5536 yaffs_DeinitialiseObjects(dev);
5537 if(dev->nShortOpCaches > 0)
5540 for(i=0; i < dev->nShortOpCaches; i++)
5542 YFREE(dev->srCache[i].data);
5545 YFREE(dev->srCache);
5548 YFREE(dev->gcCleanupList);
5550 for(i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
5552 YFREE(dev->tempBuffer[i].buffer);
5562 int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
5564 int nFree = dev->nFreeChunks - (dev->nChunksPerBlock * YAFFS_RESERVED_BLOCKS);
5566 struct list_head *i;
5570 // To the free chunks add the chunks that are in the deleted unlinked files.
5571 list_for_each(i,&dev->deletedDir->variant.directoryVariant.children)
5573 l = list_entry(i, yaffs_Object,siblings);
5577 nFree += l->nDataChunks;
5582 // printf("___________ nFreeChunks is %d nFree is %d\n",dev->nFreeChunks,nFree);
5584 if(nFree < 0) nFree = 0;
5592 int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
5597 int nDirtyCacheChunks=0;
5599 yaffs_BlockInfo *blk;
5601 struct list_head *i;
5604 for(nFree = 0, b = dev->startBlock; b <= dev->endBlock; b++)
5606 blk = yaffs_GetBlockInfo(dev,b);
5608 switch(blk->blockState)
5610 case YAFFS_BLOCK_STATE_EMPTY:
5611 case YAFFS_BLOCK_STATE_ALLOCATING:
5612 case YAFFS_BLOCK_STATE_FULL: nFree += (dev->nChunksPerBlock - blk->pagesInUse); break;
5620 // To the free chunks add the chunks that are in the deleted unlinked files.
5621 list_for_each(i,&dev->deletedDir->variant.directoryVariant.children)
5625 l = list_entry(i, yaffs_Object,siblings);
5629 pending += l->nDataChunks;
5636 //printf("___________ really free is %d, pending %d, nFree is %d\n",nFree,pending, nFree+pending);
5638 if(nFree != dev->nFreeChunks)
5640 // printf("___________Different! really free is %d, nFreeChunks %d\n",nFree dev->nFreeChunks);
5645 // Now count the number of dirty chunks in the cache and subtract those
5649 for(i = 0; i < dev->nShortOpCaches; i++)
5651 if(dev->srCache[i].dirty) nDirtyCacheChunks++;
5655 nFree -= nDirtyCacheChunks;
5657 nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
5659 if(nFree < 0) nFree = 0;
5667 /////////////////// YAFFS test code //////////////////////////////////
5669 #define yaffs_CheckStruct(structure,syze, name) \
5670 if(sizeof(structure) != syze) \
5672 T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),name,syze,sizeof(structure))); \
5673 return YAFFS_FAIL; \
5677 static int yaffs_CheckStructures(void)
5679 // yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags")
5680 // yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion")
5681 // yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare")
5682 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
5683 yaffs_CheckStruct(yaffs_Tnode,2* YAFFS_NTNODES_LEVEL0,"yaffs_Tnode")
5685 yaffs_CheckStruct(yaffs_ObjectHeader,512,"yaffs_ObjectHeader")
5692 void yaffs_GutsTest(yaffs_Device *dev)
5695 if(yaffs_CheckStructures() != YAFFS_OK)
5697 T(YAFFS_TRACE_ALWAYS,(TSTR("One or more structures malformed-- aborting\n" TENDSTR)));
5701 yaffs_TnodeTest(dev);
5702 yaffs_ObjectTest(dev);