Google Git
Sign in
chromium / chromiumos / third_party / u-boot / firmware-parrot-2685.B / . / fs / yaffs2 / yaffs_guts.c
blob: 7390b40e011f85946c27d6d74af4509eb3e256e3 [file] [log] [blame]
</
/*
* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
*
* Copyright (C) 2002-2007 Aleph One Ltd.
* for Toby Churchill Ltd and Brightstar Engineering
*
* Created by Charles Manning <charles@aleph1.co.uk>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
/* XXX U-BOOT XXX */
#include <common.h>
const char *yaffs_guts_c_version =
"$Id: yaffs_guts.c,v 1.52 2007/10/16 00:45:05 charles Exp $";
#include "yportenv.h"
#include "linux/stat.h"
#include "yaffsinterface.h"
#include "yaffsfs.h"
#include "yaffs_guts.h"
#include "yaffs_tagsvalidity.h"
#include "yaffs_tagscompat.h"
#ifndef CONFIG_YAFFS_USE_OWN_SORT
#include "yaffs_qsort.h"
#endif
#include "yaffs_nand.h"
#include "yaffs_checkptrw.h"
#include "yaffs_nand.h"
#include "yaffs_packedtags2.h"
#include "malloc.h"
#ifdef CONFIG_YAFFS_WINCE
void yfsd_LockYAFFS(BOOL fsLockOnly);
void yfsd_UnlockYAFFS(BOOL fsLockOnly);
#endif
#define YAFFS_PASSIVE_GC_CHUNKS 2
#include "yaffs_ecc.h"
/* Robustification (if it ever comes about...) */
static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND);
static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND, int erasedOk);
static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
const __u8 * data,
const yaffs_ExtendedTags * tags);
static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
const yaffs_ExtendedTags * tags);
/* Other local prototypes */
static int yaffs_UnlinkObject( yaffs_Object *obj);
static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj);
static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList);
static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device * dev,
const __u8 * buffer,
yaffs_ExtendedTags * tags,
int useReserve);
static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
int chunkInNAND, int inScan);
static yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
yaffs_ObjectType type);
static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
yaffs_Object * obj);
static int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name,
int force, int isShrink, int shadows);
static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj);
static int yaffs_CheckStructures(void);
static int yaffs_DoGenericObjectDeletion(yaffs_Object * in);
static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device * dev, int blockNo);
static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo);
static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
int lineNo);
static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
int chunkInNAND);
static int yaffs_UnlinkWorker(yaffs_Object * obj);
static void yaffs_DestroyObject(yaffs_Object * obj);
static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
int chunkInObject);
loff_t yaffs_GetFileSize(yaffs_Object * obj);
static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve, yaffs_BlockInfo **blockUsedPtr);
static void yaffs_VerifyFreeChunks(yaffs_Device * dev);
static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in);
#ifdef YAFFS_PARANOID
static int yaffs_CheckFileSanity(yaffs_Object * in);
#else
#define yaffs_CheckFileSanity(in)
#endif
static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in);
static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId);
static void yaffs_InvalidateCheckpoint(yaffs_Device *dev);
static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
yaffs_ExtendedTags * tags);
static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos);
static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
yaffs_FileStructure * fStruct,
__u32 chunkId);
/* Function to calculate chunk and offset */
static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, __u32 *chunk, __u32 *offset)
{
if(dev->chunkShift){
/* Easy-peasy power of 2 case */
*chunk = (__u32)(addr >> dev->chunkShift);
*offset = (__u32)(addr & dev->chunkMask);
}
else if(dev->crumbsPerChunk)
{
/* Case where we're using "crumbs" */
*offset = (__u32)(addr & dev->crumbMask);
addr >>= dev->crumbShift;
*chunk = ((__u32)addr)/dev->crumbsPerChunk;
*offset += ((addr - (*chunk * dev->crumbsPerChunk)) << dev->crumbShift);
}
else
YBUG();
}
/* Function to return the number of shifts for a power of 2 greater than or equal
* to the given number
* Note we don't try to cater for all possible numbers and this does not have to
* be hellishly efficient.
*/
static __u32 ShiftsGE(__u32 x)
{
int extraBits;
int nShifts;
nShifts = extraBits = 0;
while(x>1){
if(x & 1) extraBits++;
x>>=1;
nShifts++;
}
if(extraBits)
nShifts++;
return nShifts;
}
/* Function to return the number of shifts to get a 1 in bit 0
*/
static __u32 ShiftDiv(__u32 x)
{
int nShifts;
nShifts = 0;
if(!x) return 0;
while( !(x&1)){
x>>=1;
nShifts++;
}
return nShifts;
}
/*
* Temporary buffer manipulations.
*/
static int yaffs_InitialiseTempBuffers(yaffs_Device *dev)
{
int i;
__u8 *buf = (__u8 *)1;
memset(dev->tempBuffer,0,sizeof(dev->tempBuffer));
for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
dev->tempBuffer[i].line = 0; /* not in use */
dev->tempBuffer[i].buffer = buf =
YMALLOC_DMA(dev->nDataBytesPerChunk);
}
return buf ? YAFFS_OK : YAFFS_FAIL;
}
static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo)
{
int i, j;
for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
if (dev->tempBuffer[i].line == 0) {
dev->tempBuffer[i].line = lineNo;
if ((i + 1) > dev->maxTemp) {
dev->maxTemp = i + 1;
for (j = 0; j <= i; j++)
dev->tempBuffer[j].maxLine =
dev->tempBuffer[j].line;
}
return dev->tempBuffer[i].buffer;
}
}
T(YAFFS_TRACE_BUFFERS,
(TSTR("Out of temp buffers at line %d, other held by lines:"),
lineNo));
for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line));
}
T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
/*
* If we got here then we have to allocate an unmanaged one
* This is not good.
*/
dev->unmanagedTempAllocations++;
return YMALLOC(dev->nDataBytesPerChunk);
}
static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
int lineNo)
{
int i;
for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
if (dev->tempBuffer[i].buffer == buffer) {
dev->tempBuffer[i].line = 0;
return;
}
}
if (buffer) {
/* assume it is an unmanaged one. */
T(YAFFS_TRACE_BUFFERS,
(TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
lineNo));
YFREE(buffer);
dev->unmanagedTempDeallocations++;
}
}
/*
* Determine if we have a managed buffer.
*/
int yaffs_IsManagedTempBuffer(yaffs_Device * dev, const __u8 * buffer)
{
int i;
for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
if (dev->tempBuffer[i].buffer == buffer)
return 1;
}
for (i = 0; i < dev->nShortOpCaches; i++) {
if( dev->srCache[i].data == buffer )
return 1;
}
if (buffer == dev->checkpointBuffer)
return 1;
T(YAFFS_TRACE_ALWAYS,
(TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
return 0;
}
/*
* Chunk bitmap manipulations
*/
static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device * dev, int blk)
{
if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
T(YAFFS_TRACE_ERROR,
(TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
blk));
YBUG();
}
return dev->chunkBits +
(dev->chunkBitmapStride * (blk - dev->internalStartBlock));
}
static Y_INLINE void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
{
if(blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
chunk < 0 || chunk >= dev->nChunksPerBlock) {
T(YAFFS_TRACE_ERROR,
(TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),blk,chunk));
YBUG();
}
}
static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device * dev, int blk)
{
__u8 *blkBits = yaffs_BlockBits(dev, blk);
memset(blkBits, 0, dev->chunkBitmapStride);
}
static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device * dev, int blk, int chunk)
{
__u8 *blkBits = yaffs_BlockBits(dev, blk);
yaffs_VerifyChunkBitId(dev,blk,chunk);
blkBits[chunk / 8] &= ~(1 << (chunk & 7));
}
static Y_INLINE void yaffs_SetChunkBit(yaffs_Device * dev, int blk, int chunk)
{
__u8 *blkBits = yaffs_BlockBits(dev, blk);
yaffs_VerifyChunkBitId(dev,blk,chunk);
blkBits[chunk / 8] |= (1 << (chunk & 7));
}
static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device * dev, int blk, int chunk)
{
__u8 *blkBits = yaffs_BlockBits(dev, blk);
yaffs_VerifyChunkBitId(dev,blk,chunk);
return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
}
static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device * dev, int blk)
{
__u8 *blkBits = yaffs_BlockBits(dev, blk);
int i;
for (i = 0; i < dev->chunkBitmapStride; i++) {
if (*blkBits)
return 1;
blkBits++;
}
return 0;
}
static int yaffs_CountChunkBits(yaffs_Device * dev, int blk)
{
__u8 *blkBits = yaffs_BlockBits(dev, blk);
int i;
int n = 0;
for (i = 0; i < dev->chunkBitmapStride; i++) {
__u8 x = *blkBits;
while(x){
if(x & 1)
n++;
x >>=1;
}
blkBits++;
}
return n;
}
/*
* Verification code
*/
static Y_INLINE int yaffs_SkipVerification(yaffs_Device *dev)
{
return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
}
static Y_INLINE int yaffs_SkipFullVerification(yaffs_Device *dev)
{
return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
}
static Y_INLINE int yaffs_SkipNANDVerification(yaffs_Device *dev)
{
return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND));
}
static const char * blockStateName[] = {
"Unknown",
"Needs scanning",
"Scanning",
"Empty",
"Allocating",
"Full",
"Dirty",
"Checkpoint",
"Collecting",
"Dead"
};
static void yaffs_VerifyBlock(yaffs_Device *dev,yaffs_BlockInfo *bi,int n)
{
int actuallyUsed;
int inUse;
if(yaffs_SkipVerification(dev))
return;
/* Report illegal runtime states */
if(bi->blockState <0 || bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES)
T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has undefined state %d"TENDSTR),n,bi->blockState));
switch(bi->blockState){
case YAFFS_BLOCK_STATE_UNKNOWN:
case YAFFS_BLOCK_STATE_SCANNING:
case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has bad run-state %s"TENDSTR),
n,blockStateName[bi->blockState]));
}
/* Check pages in use and soft deletions are legal */
actuallyUsed = bi->pagesInUse - bi->softDeletions;
if(bi->pagesInUse < 0 || bi->pagesInUse > dev->nChunksPerBlock ||
bi->softDeletions < 0 || bi->softDeletions > dev->nChunksPerBlock ||
actuallyUsed < 0 || actuallyUsed > dev->nChunksPerBlock)
T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR),
n,bi->pagesInUse,bi->softDeletions));
/* Check chunk bitmap legal */
inUse = yaffs_CountChunkBits(dev,n);
if(inUse != bi->pagesInUse)
T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has inconsistent values pagesInUse %d counted chunk bits %d"TENDSTR),
n,bi->pagesInUse,inUse));
/* Check that the sequence number is valid.
* Ten million is legal, but is very unlikely
*/
if(dev->isYaffs2 &&
(bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || bi->blockState == YAFFS_BLOCK_STATE_FULL) &&
(bi->sequenceNumber < YAFFS_LOWEST_SEQUENCE_NUMBER || bi->sequenceNumber > 10000000 ))
T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has suspect sequence number of %d"TENDSTR),
n,bi->sequenceNumber));
}
static void yaffs_VerifyCollectedBlock(yaffs_Device *dev,yaffs_BlockInfo *bi,int n)
{
yaffs_VerifyBlock(dev,bi,n);
/* After collection the block should be in the erased state */
/* TODO: This will need to change if we do partial gc */
if(bi->blockState != YAFFS_BLOCK_STATE_EMPTY){
T(YAFFS_TRACE_ERROR,(TSTR("Block %d is in state %d after gc, should be erased"TENDSTR),
n,bi->blockState));
}
}
static void yaffs_VerifyBlocks(yaffs_Device *dev)
{
int i;
int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES];
int nIllegalBlockStates = 0;
if(yaffs_SkipVerification(dev))
return;
memset(nBlocksPerState,0,sizeof(nBlocksPerState));
for(i = dev->internalStartBlock; i <= dev->internalEndBlock; i++){
yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
yaffs_VerifyBlock(dev,bi,i);
if(bi->blockState >=0 && bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES)
nBlocksPerState[bi->blockState]++;
else
nIllegalBlockStates++;
}
T(YAFFS_TRACE_VERIFY,(TSTR(""TENDSTR)));
T(YAFFS_TRACE_VERIFY,(TSTR("Block summary"TENDSTR)));
T(YAFFS_TRACE_VERIFY,(TSTR("%d blocks have illegal states"TENDSTR),nIllegalBlockStates));
if(nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
T(YAFFS_TRACE_VERIFY,(TSTR("Too many allocating blocks"TENDSTR)));
for(i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
T(YAFFS_TRACE_VERIFY,
(TSTR("%s %d blocks"TENDSTR),
blockStateName[i],nBlocksPerState[i]));
if(dev->blocksInCheckpoint != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])
T(YAFFS_TRACE_VERIFY,
(TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR),
dev->blocksInCheckpoint, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]));
if(dev->nErasedBlocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])
T(YAFFS_TRACE_VERIFY,
(TSTR("Erased block count wrong dev %d count %d"TENDSTR),
dev->nErasedBlocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]));
if(nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1)
T(YAFFS_TRACE_VERIFY,
(TSTR("Too many collecting blocks %d (max is 1)"TENDSTR),
nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING]));
T(YAFFS_TRACE_VERIFY,(TSTR(""TENDSTR)));
}
/*
* Verify the object header. oh must be valid, but obj and tags may be NULL in which
* case those tests will not be performed.
*/
static void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck)
{
if(yaffs_SkipVerification(obj->myDev))
return;
if(!(tags && obj && oh)){
T(YAFFS_TRACE_VERIFY,
(TSTR("Verifying object header tags %x obj %x oh %x"TENDSTR),
(__u32)tags,(__u32)obj,(__u32)oh));
return;
}
if(oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
oh->type > YAFFS_OBJECT_TYPE_MAX)
T(YAFFS_TRACE_VERIFY,
(TSTR("Obj %d header type is illegal value 0x%x"TENDSTR),
tags->objectId, oh->type));
if(tags->objectId != obj->objectId)
T(YAFFS_TRACE_VERIFY,
(TSTR("Obj %d header mismatch objectId %d"TENDSTR),
tags->objectId, obj->objectId));
/*
* Check that the object's parent ids match if parentCheck requested.
*
* Tests do not apply to the root object.
*/
if(parentCheck && tags->objectId > 1 && !obj->parent)
T(YAFFS_TRACE_VERIFY,
(TSTR("Obj %d header mismatch parentId %d obj->parent is NULL"TENDSTR),
tags->objectId, oh->parentObjectId));
if(parentCheck && obj->parent &&
oh->parentObjectId != obj->parent->objectId &&
(oh->parentObjectId != YAFFS_OBJECTID_UNLINKED ||
obj->parent->objectId != YAFFS_OBJECTID_DELETED))
T(YAFFS_TRACE_VERIFY,
(TSTR("Obj %d header mismatch parentId %d parentObjectId %d"TENDSTR),
tags->objectId, oh->parentObjectId, obj->parent->objectId));
if(tags->objectId > 1 && oh->name[0] == 0) /* Null name */
T(YAFFS_TRACE_VERIFY,
(TSTR("Obj %d header name is NULL"TENDSTR),
obj->objectId));
if(tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */
T(YAFFS_TRACE_VERIFY,
(TSTR("Obj %d header name is 0xFF"TENDSTR),
obj->objectId));
}
static void yaffs_VerifyFile(yaffs_Object *obj)
{
int requiredTallness;
int actualTallness;
__u32 lastChunk;
__u32 x;
__u32 i;
yaffs_Device *dev;
yaffs_ExtendedTags tags;
yaffs_Tnode *tn;
__u32 objectId;
if(obj && yaffs_SkipVerification(obj->myDev))
return;
dev = obj->myDev;
objectId = obj->objectId;
/* Check file size is consistent with tnode depth */
lastChunk = obj->variant.fileVariant.fileSize / dev->nDataBytesPerChunk + 1;
x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS;
requiredTallness = 0;
while (x> 0) {
x >>= YAFFS_TNODES_INTERNAL_BITS;
requiredTallness++;
}
actualTallness = obj->variant.fileVariant.topLevel;
if(requiredTallness > actualTallness )
T(YAFFS_TRACE_VERIFY,
(TSTR("Obj %d had tnode tallness %d, needs to be %d"TENDSTR),
obj->objectId,actualTallness, requiredTallness));
/* Check that the chunks in the tnode tree are all correct.
* We do this by scanning through the tnode tree and
* checking the tags for every chunk match.
*/
if(yaffs_SkipNANDVerification(dev))
return;
for(i = 1; i <= lastChunk; i++){
tn = yaffs_FindLevel0Tnode(dev, &obj->variant.fileVariant,i);
if (tn) {
__u32 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
if(theChunk > 0){
/* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),objectId,i,theChunk)); */
yaffs_ReadChunkWithTagsFromNAND(dev,theChunk,NULL, &tags);
if(tags.objectId != objectId || tags.chunkId != i){
T(~0,(TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
objectId, i, theChunk,
tags.objectId, tags.chunkId));
}
}
}
}
}
static void yaffs_VerifyDirectory(yaffs_Object *obj)
{
if(obj && yaffs_SkipVerification(obj->myDev))
return;
}
static void yaffs_VerifyHardLink(yaffs_Object *obj)
{
if(obj && yaffs_SkipVerification(obj->myDev))
return;
/* Verify sane equivalent object */
}
static void yaffs_VerifySymlink(yaffs_Object *obj)
{
if(obj && yaffs_SkipVerification(obj->myDev))
return;
/* Verify symlink string */
}
static void yaffs_VerifySpecial(yaffs_Object *obj)
{
if(obj && yaffs_SkipVerification(obj->myDev))
return;
}
static void yaffs_VerifyObject(yaffs_Object *obj)
{
yaffs_Device *dev;
__u32 chunkMin;
__u32 chunkMax;
__u32 chunkIdOk;
__u32 chunkIsLive;
if(!obj)
return;
dev = obj->myDev;
if(yaffs_SkipVerification(dev))
return;
/* Check sane object header chunk */
chunkMin = dev->internalStartBlock * dev->nChunksPerBlock;
chunkMax = (dev->internalEndBlock+1) * dev->nChunksPerBlock - 1;
chunkIdOk = (obj->chunkId >= chunkMin && obj->chunkId <= chunkMax);
chunkIsLive = chunkIdOk &&
yaffs_CheckChunkBit(dev,
obj->chunkId / dev->nChunksPerBlock,
obj->chunkId % dev->nChunksPerBlock);
if(!obj->fake &&
(!chunkIdOk || !chunkIsLive)) {
T(YAFFS_TRACE_VERIFY,
(TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
obj->objectId,obj->chunkId,
chunkIdOk ? "" : ",out of range",
chunkIsLive || !chunkIdOk ? "" : ",marked as deleted"));
}
if(chunkIdOk && chunkIsLive &&!yaffs_SkipNANDVerification(dev)) {
yaffs_ExtendedTags tags;
yaffs_ObjectHeader *oh;
__u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__);
oh = (yaffs_ObjectHeader *)buffer;
yaffs_ReadChunkWithTagsFromNAND(dev, obj->chunkId,buffer, &tags);
yaffs_VerifyObjectHeader(obj,oh,&tags,1);
yaffs_ReleaseTempBuffer(dev,buffer,__LINE__);
}
/* Verify it has a parent */
if(obj && !obj->fake &&
(!obj->parent || obj->parent->myDev != dev)){
T(YAFFS_TRACE_VERIFY,
(TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR),
obj->objectId,obj->parent));
}
/* Verify parent is a directory */
if(obj->parent && obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY){
T(YAFFS_TRACE_VERIFY,
(TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR),
obj->objectId,obj->parent->variantType));
}
switch(obj->variantType){
case YAFFS_OBJECT_TYPE_FILE:
yaffs_VerifyFile(obj);
break;
case YAFFS_OBJECT_TYPE_SYMLINK:
yaffs_VerifySymlink(obj);
break;
case YAFFS_OBJECT_TYPE_DIRECTORY:
yaffs_VerifyDirectory(obj);
break;
case YAFFS_OBJECT_TYPE_HARDLINK:
yaffs_VerifyHardLink(obj);
break;
case YAFFS_OBJECT_TYPE_SPECIAL:
yaffs_VerifySpecial(obj);
break;
case YAFFS_OBJECT_TYPE_UNKNOWN:
default:
T(YAFFS_TRACE_VERIFY,
(TSTR("Obj %d has illegaltype %d"TENDSTR),
obj->objectId,obj->variantType));
break;
}
}
static void yaffs_VerifyObjects(yaffs_Device *dev)
{
yaffs_Object *obj;
int i;
struct list_head *lh;
if(yaffs_SkipVerification(dev))
return;
/* Iterate through the objects in each hash entry */
for(i = 0; i < YAFFS_NOBJECT_BUCKETS; i++){
list_for_each(lh, &dev->objectBucket[i].list) {
if (lh) {
obj = list_entry(lh, yaffs_Object, hashLink);
yaffs_VerifyObject(obj);
}
}
}
}
/*
* Simple hash function. Needs to have a reasonable spread
*/
static Y_INLINE int yaffs_HashFunction(int n)
{
/* XXX U-BOOT XXX */
/*n = abs(n); */
if (n < 0)
n = -n;
return (n % YAFFS_NOBJECT_BUCKETS);
}
/*
* Access functions to useful fake objects
*/
yaffs_Object *yaffs_Root(yaffs_Device * dev)
{
return dev->rootDir;
}
yaffs_Object *yaffs_LostNFound(yaffs_Device * dev)
{
return dev->lostNFoundDir;
}
/*
* Erased NAND checking functions
*/
int yaffs_CheckFF(__u8 * buffer, int nBytes)
{
/* Horrible, slow implementation */
while (nBytes--) {
if (*buffer != 0xFF)
return 0;
buffer++;
}
return 1;
}
static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
int chunkInNAND)
{
int retval = YAFFS_OK;
__u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
yaffs_ExtendedTags tags;
yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
if(tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
retval = YAFFS_FAIL;
if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
T(YAFFS_TRACE_NANDACCESS,
(TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
retval = YAFFS_FAIL;
}
yaffs_ReleaseTempBuffer(dev, data, __LINE__);
return retval;
}
static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
const __u8 * data,
yaffs_ExtendedTags * tags,
int useReserve)
{
int attempts = 0;
int writeOk = 0;
int chunk;
yaffs_InvalidateCheckpoint(dev);
do {
yaffs_BlockInfo *bi = 0;
int erasedOk = 0;
chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
if (chunk < 0) {
/* no space */
break;
}
/* First check this chunk is erased, if it needs
* checking. The checking policy (unless forced
* always on) is as follows:
*
* Check the first page we try to write in a block.
* If the check passes then we don't need to check any
* more. If the check fails, we check again...
* If the block has been erased, we don't need to check.
*
* However, if the block has been prioritised for gc,
* then we think there might be something odd about
* this block and stop using it.
*
* Rationale: We should only ever see chunks that have
* not been erased if there was a partially written
* chunk due to power loss. This checking policy should
* catch that case with very few checks and thus save a
* lot of checks that are most likely not needed.
*/
if (bi->gcPrioritise) {
yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
/* try another chunk */
continue;
}
/* let's give it a try */
attempts++;
#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
bi->skipErasedCheck = 0;
#endif
if (!bi->skipErasedCheck) {
erasedOk = yaffs_CheckChunkErased(dev, chunk);
if (erasedOk != YAFFS_OK) {
T(YAFFS_TRACE_ERROR,
(TSTR ("**>> yaffs chunk %d was not erased"
TENDSTR), chunk));
/* try another chunk */
continue;
}
bi->skipErasedCheck = 1;
}
writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
data, tags);
if (writeOk != YAFFS_OK) {
yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
/* try another chunk */
continue;
}
/* Copy the data into the robustification buffer */
yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
} while (writeOk != YAFFS_OK &&
(yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
if(!writeOk)
chunk = -1;
if (attempts > 1) {
T(YAFFS_TRACE_ERROR,
(TSTR("**>> yaffs write required %d attempts" TENDSTR),
attempts));
dev->nRetriedWrites += (attempts - 1);
}
return chunk;
}
/*
* Block retiring for handling a broken block.
*/
static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND)
{
yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
yaffs_InvalidateCheckpoint(dev);
yaffs_MarkBlockBad(dev, blockInNAND);
bi->blockState = YAFFS_BLOCK_STATE_DEAD;
bi->gcPrioritise = 0;
bi->needsRetiring = 0;
dev->nRetiredBlocks++;
}
/*
* Functions for robustisizing TODO
*
*/
static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
const __u8 * data,
const yaffs_ExtendedTags * tags)
{
}
static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
const yaffs_ExtendedTags * tags)
{
}
void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
{
if(!bi->gcPrioritise){
bi->gcPrioritise = 1;
dev->hasPendingPrioritisedGCs = 1;
bi->chunkErrorStrikes ++;
if(bi->chunkErrorStrikes > 3){
bi->needsRetiring = 1; /* Too many stikes, so retire this */
T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
}
}
}
static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND, int erasedOk)
{
int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
yaffs_HandleChunkError(dev,bi);
if(erasedOk ) {
/* Was an actual write failure, so mark the block for retirement */
bi->needsRetiring = 1;
T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
(TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
}
/* Delete the chunk */
yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
}
/*---------------- Name handling functions ------------*/
static __u16 yaffs_CalcNameSum(const YCHAR * name)
{
__u16 sum = 0;
__u16 i = 1;
YUCHAR *bname = (YUCHAR *) name;
if (bname) {
while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
sum += yaffs_toupper(*bname) * i;
#else
sum += (*bname) * i;
#endif
i++;
bname++;
}
}
return sum;
}
static void yaffs_SetObjectName(yaffs_Object * obj, const YCHAR * name)
{
#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
if (name && yaffs_strlen(name) <= YAFFS_SHORT_NAME_LENGTH) {
yaffs_strcpy(obj->shortName, name);
} else {
obj->shortName[0] = _Y('\0');
}
#endif
obj->sum = yaffs_CalcNameSum(name);
}
/*-------------------- TNODES -------------------
* List of spare tnodes
* The list is hooked together using the first pointer
* in the tnode.
*/
/* yaffs_CreateTnodes creates a bunch more tnodes and
* adds them to the tnode free list.
* Don't use this function directly
*/
static int yaffs_CreateTnodes(yaffs_Device * dev, int nTnodes)
{
int i;
int tnodeSize;
yaffs_Tnode *newTnodes;
__u8 *mem;
yaffs_Tnode *curr;
yaffs_Tnode *next;
yaffs_TnodeList *tnl;
if (nTnodes < 1)
return YAFFS_OK;
/* Calculate the tnode size in bytes for variable width tnode support.
* Must be a multiple of 32-bits */
tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
/* make these things */
newTnodes = YMALLOC(nTnodes * tnodeSize);
mem = (__u8 *)newTnodes;
if (!newTnodes) {
T(YAFFS_TRACE_ERROR,
(TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
return YAFFS_FAIL;
}
/* Hook them into the free list */
#if 0
for (i = 0; i < nTnodes - 1; i++) {
newTnodes[i].internal[0] = &newTnodes[i + 1];
#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
#endif
}
newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
#endif
dev->freeTnodes = newTnodes;
#else
/* New hookup for wide tnodes */
for(i = 0; i < nTnodes -1; i++) {
curr = (yaffs_Tnode *) &mem[i * tnodeSize];
next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
curr->internal[0] = next;
}
curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
curr->internal[0] = dev->freeTnodes;
dev->freeTnodes = (yaffs_Tnode *)mem;
#endif
dev->nFreeTnodes += nTnodes;
dev->nTnodesCreated += nTnodes;
/* Now add this bunch of tnodes to a list for freeing up.
* NB If we can't add this to the management list it isn't fatal
* but it just means we can't free this bunch of tnodes later.
*/
tnl = YMALLOC(sizeof(yaffs_TnodeList));
if (!tnl) {
T(YAFFS_TRACE_ERROR,
(TSTR
("yaffs: Could not add tnodes to management list" TENDSTR)));
return YAFFS_FAIL;
} else {
tnl->tnodes = newTnodes;
tnl->next = dev->allocatedTnodeList;
dev->allocatedTnodeList = tnl;
}
T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
return YAFFS_OK;
}
/* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device * dev)
{
yaffs_Tnode *tn = NULL;
/* If there are none left make more */
if (!dev->freeTnodes) {
yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
}
if (dev->freeTnodes) {
tn = dev->freeTnodes;
#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
/* Hoosterman, this thing looks like it isn't in the list */
T(YAFFS_TRACE_ALWAYS,
(TSTR("yaffs: Tnode list bug 1" TENDSTR)));
}
#endif
dev->freeTnodes = dev->freeTnodes->internal[0];
dev->nFreeTnodes--;
}
return tn;
}
static yaffs_Tnode *yaffs_GetTnode(yaffs_Device * dev)
{
yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
if(tn)
memset(tn, 0, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
return tn;
}
/* FreeTnode frees up a tnode and puts it back on the free list */
static void yaffs_FreeTnode(yaffs_Device * dev, yaffs_Tnode * tn)
{
if (tn) {
#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
/* Hoosterman, this thing looks like it is already in the list */
T(YAFFS_TRACE_ALWAYS,
(TSTR("yaffs: Tnode list bug 2" TENDSTR)));
}
tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
#endif
tn->internal[0] = dev->freeTnodes;
dev->freeTnodes = tn;
dev->nFreeTnodes++;
}
}
static void yaffs_DeinitialiseTnodes(yaffs_Device * dev)
{
/* Free the list of allocated tnodes */
yaffs_TnodeList *tmp;
while (dev->allocatedTnodeList) {
tmp = dev->allocatedTnodeList->next;
YFREE(dev->allocatedTnodeList->tnodes);
YFREE(dev->allocatedTnodeList);
dev->allocatedTnodeList = tmp;
}
dev->freeTnodes = NULL;
dev->nFreeTnodes = 0;
}
static void yaffs_InitialiseTnodes(yaffs_Device * dev)
{
dev->allocatedTnodeList = NULL;
dev->freeTnodes = NULL;
dev->nFreeTnodes = 0;
dev->nTnodesCreated = 0;
}
void yaffs_PutLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos, unsigned val)
{
__u32 *map = (__u32 *)tn;
__u32 bitInMap;
__u32 bitInWord;
__u32 wordInMap;
__u32 mask;
pos &= YAFFS_TNODES_LEVEL0_MASK;
val >>= dev->chunkGroupBits;
bitInMap = pos * dev->tnodeWidth;
wordInMap = bitInMap /32;
bitInWord = bitInMap & (32 -1);
mask = dev->tnodeMask << bitInWord;
map[wordInMap] &= ~mask;
map[wordInMap] |= (mask & (val << bitInWord));
if(dev->tnodeWidth > (32-bitInWord)) {
bitInWord = (32 - bitInWord);
wordInMap++;;
mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
map[wordInMap] &= ~mask;
map[wordInMap] |= (mask & (val >> bitInWord));
}
}
static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos)
{
__u32 *map = (__u32 *)tn;
__u32 bitInMap;
__u32 bitInWord;
__u32 wordInMap;
__u32 val;
pos &= YAFFS_TNODES_LEVEL0_MASK;
bitInMap = pos * dev->tnodeWidth;
wordInMap = bitInMap /32;
bitInWord = bitInMap & (32 -1);
val = map[wordInMap] >> bitInWord;
if(dev->tnodeWidth > (32-bitInWord)) {
bitInWord = (32 - bitInWord);
wordInMap++;;
val |= (map[wordInMap] << bitInWord);
}
val &= dev->tnodeMask;
val <<= dev->chunkGroupBits;
return val;
}
/* ------------------- End of individual tnode manipulation -----------------*/
/* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
* The look up tree is represented by the top tnode and the number of topLevel
* in the tree. 0 means only the level 0 tnode is in the tree.
*/
/* FindLevel0Tnode finds the level 0 tnode, if one exists. */
static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
yaffs_FileStructure * fStruct,
__u32 chunkId)
{
yaffs_Tnode *tn = fStruct->top;
__u32 i;
int requiredTallness;
int level = fStruct->topLevel;
/* Check sane level and chunk Id */
if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL) {
return NULL;
}
if (chunkId > YAFFS_MAX_CHUNK_ID) {
return NULL;
}
/* First check we're tall enough (ie enough topLevel) */
i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
requiredTallness = 0;
while (i) {
i >>= YAFFS_TNODES_INTERNAL_BITS;
requiredTallness++;
}
if (requiredTallness > fStruct->topLevel) {
/* Not tall enough, so we can't find it, return NULL. */
return NULL;
}
/* Traverse down to level 0 */
while (level > 0 && tn) {
tn = tn->
internal[(chunkId >>
( YAFFS_TNODES_LEVEL0_BITS +
(level - 1) *
YAFFS_TNODES_INTERNAL_BITS)
) &
YAFFS_TNODES_INTERNAL_MASK];
level--;
}
return tn;
}
/* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
* This happens in two steps:
* 1. If the tree isn't tall enough, then make it taller.
* 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
*
* Used when modifying the tree.
*
* If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
* be plugged into the ttree.
*/
static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device * dev,
yaffs_FileStructure * fStruct,
__u32 chunkId,
yaffs_Tnode *passedTn)
{
int requiredTallness;
int i;
int l;
yaffs_Tnode *tn;
__u32 x;
/* Check sane level and page Id */
if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL) {
return NULL;
}
if (chunkId > YAFFS_MAX_CHUNK_ID) {
return NULL;
}
/* First check we're tall enough (ie enough topLevel) */
x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
requiredTallness = 0;
while (x) {
x >>= YAFFS_TNODES_INTERNAL_BITS;
requiredTallness++;
}
if (requiredTallness > fStruct->topLevel) {
/* Not tall enough,gotta make the tree taller */
for (i = fStruct->topLevel; i < requiredTallness; i++) {
tn = yaffs_GetTnode(dev);
if (tn) {
tn->internal[0] = fStruct->top;
fStruct->top = tn;
} else {
T(YAFFS_TRACE_ERROR,
(TSTR("yaffs: no more tnodes" TENDSTR)));
}
}
fStruct->topLevel = requiredTallness;
}
/* Traverse down to level 0, adding anything we need */
l = fStruct->topLevel;
tn = fStruct->top;
if(l > 0) {
while (l > 0 && tn) {
x = (chunkId >>
( YAFFS_TNODES_LEVEL0_BITS +
(l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
YAFFS_TNODES_INTERNAL_MASK;
if((l>1) && !tn->internal[x]){
/* Add missing non-level-zero tnode */
tn->internal[x] = yaffs_GetTnode(dev);
} else if(l == 1) {
/* Looking from level 1 at level 0 */
if (passedTn) {
/* If we already have one, then release it.*/
if(tn->internal[x])
yaffs_FreeTnode(dev,tn->internal[x]);
tn->internal[x] = passedTn;
} else if(!tn->internal[x]) {
/* Don't have one, none passed in */
tn->internal[x] = yaffs_GetTnode(dev);
}
}
tn = tn->internal[x];
l--;
}
} else {
/* top is level 0 */
if(passedTn) {
memcpy(tn,passedTn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
yaffs_FreeTnode(dev,passedTn);
}
}
return tn;
}
static int yaffs_FindChunkInGroup(yaffs_Device * dev, int theChunk,
yaffs_ExtendedTags * tags, int objectId,
int chunkInInode)
{
int j;
for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
if (yaffs_CheckChunkBit
(dev, theChunk / dev->nChunksPerBlock,
theChunk % dev->nChunksPerBlock)) {
yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
tags);
if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
/* found it; */
return theChunk;
}
}
theChunk++;
}
return -1;
}
static void yaffs_SoftDeleteChunk(yaffs_Device * dev, int chunk)
{
yaffs_BlockInfo *theBlock;
T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
theBlock = yaffs_GetBlockInfo(dev, chunk / dev->nChunksPerBlock);
if (theBlock) {
theBlock->softDeletions++;
dev->nFreeChunks++;
}
}
/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
* All soft deleting does is increment the block's softdelete count and pulls the chunk out
* of the tnode.
* Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
*/
static int yaffs_SoftDeleteWorker(yaffs_Object * in, yaffs_Tnode * tn,
__u32 level, int chunkOffset)
{
int i;
int theChunk;
int allDone = 1;
yaffs_Device *dev = in->myDev;
if (tn) {
if (level > 0) {
for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
i--) {
if (tn->internal[i]) {
allDone =
yaffs_SoftDeleteWorker(in,
tn->
internal[i],
level - 1,
(chunkOffset
<<
YAFFS_TNODES_INTERNAL_BITS)
+ i);
if (allDone) {
yaffs_FreeTnode(dev,
tn->
internal[i]);
tn->internal[i] = NULL;
} else {
/* Hoosterman... how could this happen? */
}
}
}
return (allDone) ? 1 : 0;
} else if (level == 0) {
for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
if (theChunk) {
/* Note this does not find the real chunk, only the chunk group.
* We make an assumption that a chunk group is not larger than
* a block.
*/
yaffs_SoftDeleteChunk(dev, theChunk);
yaffs_PutLevel0Tnode(dev,tn,i,0);
}
}
return 1;
}
}
return 1;
}
static void yaffs_SoftDeleteFile(yaffs_Object * obj)
{
if (obj->deleted &&
obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
if (obj->nDataChunks <= 0) {
/* Empty file with no duplicate object headers, just delete it immediately */
yaffs_FreeTnode(obj->myDev,
obj->variant.fileVariant.top);
obj->variant.fileVariant.top = NULL;
T(YAFFS_TRACE_TRACING,
(TSTR("yaffs: Deleting empty file %d" TENDSTR),
obj->objectId));
yaffs_DoGenericObjectDeletion(obj);
} else {
yaffs_SoftDeleteWorker(obj,
obj->variant.fileVariant.top,
obj->variant.fileVariant.
topLevel, 0);
obj->softDeleted = 1;
}
}
}
/* Pruning removes any part of the file structure tree that is beyond the
* bounds of the file (ie that does not point to chunks).
*
* A file should only get pruned when its size is reduced.
*
* Before pruning, the chunks must be pulled from the tree and the
* level 0 tnode entries must be zeroed out.
* Could also use this for file deletion, but that's probably better handled
* by a special case.
*/
static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device * dev, yaffs_Tnode * tn,
__u32 level, int del0)
{
int i;
int hasData;
if (tn) {
hasData = 0;
for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
if (tn->internal[i] && level > 0) {
tn->internal[i] =
yaffs_PruneWorker(dev, tn->internal[i],
level - 1,
(i == 0) ? del0 : 1);
}
if (tn->internal[i]) {
hasData++;
}
}
if (hasData == 0 && del0) {
/* Free and return NULL */
yaffs_FreeTnode(dev, tn);
tn = NULL;
}
}
return tn;
}
static int yaffs_PruneFileStructure(yaffs_Device * dev,
yaffs_FileStructure * fStruct)
{
int i;
int hasData;
int done = 0;
yaffs_Tnode *tn;
if (fStruct->topLevel > 0) {
fStruct->top =
yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
/* Now we have a tree with all the non-zero branches NULL but the height
* is the same as it was.
* Let's see if we can trim internal tnodes to shorten the tree.
* We can do this if only the 0th element in the tnode is in use
* (ie all the non-zero are NULL)
*/
while (fStruct->topLevel && !done) {
tn = fStruct->top;
hasData = 0;
for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
if (tn->internal[i]) {
hasData++;
}
}
if (!hasData) {
fStruct->top = tn->internal[0];
fStruct->topLevel--;
yaffs_FreeTnode(dev, tn);
} else {
done = 1;
}
}
}
return YAFFS_OK;
}
/*-------------------- End of File Structure functions.-------------------*/
/* yaffs_CreateFreeObjects creates a bunch more objects and
* adds them to the object free list.
*/
static int yaffs_CreateFreeObjects(yaffs_Device * dev, int nObjects)
{
int i;
yaffs_Object *newObjects;
yaffs_ObjectList *list;
if (nObjects < 1)
return YAFFS_OK;
/* make these things */
newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
list = YMALLOC(sizeof(yaffs_ObjectList));
if (!newObjects || !list) {
if(newObjects)
YFREE(newObjects);
if(list)
YFREE(list);
T(YAFFS_TRACE_ALLOCATE,
(TSTR("yaffs: Could not allocate more objects" TENDSTR)));
return YAFFS_FAIL;
}
/* Hook them into the free list */
for (i = 0; i < nObjects - 1; i++) {
newObjects[i].siblings.next =
(struct list_head *)(&newObjects[i + 1]);
}
newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
dev->freeObjects = newObjects;
dev->nFreeObjects += nObjects;
dev->nObjectsCreated += nObjects;
/* Now add this bunch of Objects to a list for freeing up. */
list->objects = newObjects;
list->next = dev->allocatedObjectList;
dev->allocatedObjectList = list;
return YAFFS_OK;
}
/* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device * dev)
{
yaffs_Object *tn = NULL;
/* If there are none left make more */
if (!dev->freeObjects) {
yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
}
if (dev->freeObjects) {
tn = dev->freeObjects;
dev->freeObjects =
(yaffs_Object *) (dev->freeObjects->siblings.next);
dev->nFreeObjects--;
/* Now sweeten it up... */
memset(tn, 0, sizeof(yaffs_Object));
tn->myDev = dev;
tn->chunkId = -1;
tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
INIT_LIST_HEAD(&(tn->hardLinks));
INIT_LIST_HEAD(&(tn->hashLink));
INIT_LIST_HEAD(&tn->siblings);
/* Add it to the lost and found directory.
* NB Can't put root or lostNFound in lostNFound so
* check if lostNFound exists first
*/
if (dev->lostNFoundDir) {
yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
}
}
return tn;
}
static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device * dev, int number,
__u32 mode)
{
yaffs_Object *obj =
yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
if (obj) {
obj->fake = 1; /* it is fake so it has no NAND presence... */
obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
obj->unlinkAllowed = 0; /* ... or unlink it */
obj->deleted = 0;
obj->unlinked = 0;
obj->yst_mode = mode;
obj->myDev = dev;
obj->chunkId = 0; /* Not a valid chunk. */
}
return obj;
}
static void yaffs_UnhashObject(yaffs_Object * tn)
{
int bucket;
yaffs_Device *dev = tn->myDev;
/* If it is still linked into the bucket list, free from the list */
if (!list_empty(&tn->hashLink)) {
list_del_init(&tn->hashLink);
bucket = yaffs_HashFunction(tn->objectId);
dev->objectBucket[bucket].count--;
}
}
/* FreeObject frees up a Object and puts it back on the free list */
static void yaffs_FreeObject(yaffs_Object * tn)
{
yaffs_Device *dev = tn->myDev;
/* XXX U-BOOT XXX */
#if 0
#ifdef __KERNEL__
if (tn->myInode) {
/* We're still hooked up to a cached inode.
* Don't delete now, but mark for later deletion
*/
tn->deferedFree = 1;
return;
}
#endif
#endif
yaffs_UnhashObject(tn);
/* Link into the free list. */
tn->siblings.next = (struct list_head *)(dev->freeObjects);
dev->freeObjects = tn;
dev->nFreeObjects++;
}
/* XXX U-BOOT XXX */
#if 0
#ifdef __KERNEL__
void yaffs_HandleDeferedFree(yaffs_Object * obj)
{
if (obj->deferedFree) {
yaffs_FreeObject(obj);
}
}
#endif
#endif
static void yaffs_DeinitialiseObjects(yaffs_Device * dev)
{
/* Free the list of allocated Objects */
yaffs_ObjectList *tmp;
while (dev->allocatedObjectList) {
tmp = dev->allocatedObjectList->next;
YFREE(dev->allocatedObjectList->objects);
YFREE(dev->allocatedObjectList);
dev->allocatedObjectList = tmp;
}
dev->freeObjects = NULL;
dev->nFreeObjects = 0;
}
static void yaffs_InitialiseObjects(yaffs_Device * dev)
{
int i;
dev->allocatedObjectList = NULL;
dev->freeObjects = NULL;
dev->nFreeObjects = 0;
for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
INIT_LIST_HEAD(&dev->objectBucket[i].list);
dev->objectBucket[i].count = 0;
}
}
static int yaffs_FindNiceObjectBucket(yaffs_Device * dev)
{
static int x = 0;
int i;
int l = 999;
int lowest = 999999;
/* First let's see if we can find one that's empty. */
for (i = 0; i < 10 && lowest > 0; i++) {
x++;
x %= YAFFS_NOBJECT_BUCKETS;
if (dev->objectBucket[x].count < lowest) {
lowest = dev->objectBucket[x].count;
l = x;
}
}
/* If we didn't find an empty list, then try
* looking a bit further for a short one
*/
for (i = 0; i < 10 && lowest > 3; i++) {
x++;
x %= YAFFS_NOBJECT_BUCKETS;
if (dev->objectBucket[x].count < lowest) {
lowest = dev->objectBucket[x].count;
l = x;
}
}
return l;
}
static int yaffs_CreateNewObjectNumber(yaffs_Device * dev)
{
int bucket = yaffs_FindNiceObjectBucket(dev);
/* Now find an object value that has not already been taken
* by scanning the list.
*/
int found = 0;
struct list_head *i;
__u32 n = (__u32) bucket;
/* yaffs_CheckObjectHashSanity(); */
while (!found) {
found = 1;
n += YAFFS_NOBJECT_BUCKETS;
if (1 || dev->objectBucket[bucket].count > 0) {
list_for_each(i, &dev->objectBucket[bucket].list) {
/* If there is already one in the list */
if (i
&& list_entry(i, yaffs_Object,
hashLink)->objectId == n) {
found = 0;
}
}
}
}
return n;
}
static void yaffs_HashObject(yaffs_Object * in)
{
int bucket = yaffs_HashFunction(in->objectId);
yaffs_Device *dev = in->myDev;
list_add(&in->hashLink, &dev->objectBucket[bucket].list);
dev->objectBucket[bucket].count++;
}
yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device * dev, __u32 number)
{
int bucket = yaffs_HashFunction(number);
struct list_head *i;
yaffs_Object *in;
list_for_each(i, &dev->objectBucket[bucket].list) {
/* Look if it is in the list */
if (i) {
in = list_entry(i, yaffs_Object, hashLink);
if (in->objectId == number) {
/* XXX U-BOOT XXX */
#if 0
#ifdef __KERNEL__
/* Don't tell the VFS about this one if it is defered free */
if (in->deferedFree)
return NULL;
#endif
#endif
return in;
}
}
}
return NULL;
}
yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
yaffs_ObjectType type)
{
yaffs_Object *theObject;
yaffs_Tnode *tn = NULL;
if (number < 0) {
number = yaffs_CreateNewObjectNumber(dev);
}
theObject = yaffs_AllocateEmptyObject(dev);
if(!theObject)
return NULL;
if(type == YAFFS_OBJECT_TYPE_FILE){
tn = yaffs_GetTnode(dev);
if(!tn){
yaffs_FreeObject(theObject);
return NULL;
}
}
if (theObject) {
theObject->fake = 0;
theObject->renameAllowed = 1;
theObject->unlinkAllowed = 1;
theObject->objectId = number;
yaffs_HashObject(theObject);
theObject->variantType = type;
#ifdef CONFIG_YAFFS_WINCE
yfsd_WinFileTimeNow(theObject->win_atime);
theObject->win_ctime[0] = theObject->win_mtime[0] =
theObject->win_atime[0];
theObject->win_ctime[1] = theObject->win_mtime[1] =
theObject->win_atime[1];
#else
theObject->yst_atime = theObject->yst_mtime =
theObject->yst_ctime = Y_CURRENT_TIME;
#endif
switch (type) {
case YAFFS_OBJECT_TYPE_FILE:
theObject->variant.fileVariant.fileSize = 0;
theObject->variant.fileVariant.scannedFileSize = 0;
theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
theObject->variant.fileVariant.topLevel = 0;
theObject->variant.fileVariant.top = tn;
break;
case YAFFS_OBJECT_TYPE_DIRECTORY:
INIT_LIST_HEAD(&theObject->variant.directoryVariant.
children);
break;
case YAFFS_OBJECT_TYPE_SYMLINK:
case YAFFS_OBJECT_TYPE_HARDLINK:
case YAFFS_OBJECT_TYPE_SPECIAL:
/* No action required */
break;
case YAFFS_OBJECT_TYPE_UNKNOWN:
/* todo this should not happen */
break;
}
}
return theObject;
}
static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device * dev,
int number,
yaffs_ObjectType type)
{
yaffs_Object *theObject = NULL;
if (number > 0) {
theObject = yaffs_FindObjectByNumber(dev, number);
}
if (!theObject) {
theObject = yaffs_CreateNewObject(dev, number, type);
}
return theObject;
}
static YCHAR *yaffs_CloneString(const YCHAR * str)
{
YCHAR *newStr = NULL;
if (str && *str) {
newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
if(newStr)
yaffs_strcpy(newStr, str);
}
return newStr;
}
/*
* Mknod (create) a new object.
* equivalentObject only has meaning for a hard link;
* aliasString only has meaning for a sumlink.
* rdev only has meaning for devices (a subset of special objects)
*/
static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
yaffs_Object * parent,
const YCHAR * name,
__u32 mode,
__u32 uid,
__u32 gid,
yaffs_Object * equivalentObject,
const YCHAR * aliasString, __u32 rdev)
{
yaffs_Object *in;
YCHAR *str = NULL;
yaffs_Device *dev = parent->myDev;
/* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
if (yaffs_FindObjectByName(parent, name)) {
return NULL;
}
in = yaffs_CreateNewObject(dev, -1, type);
if(type == YAFFS_OBJECT_TYPE_SYMLINK){
str = yaffs_CloneString(aliasString);
if(!str){
yaffs_FreeObject(in);
return NULL;
}
}
if (in) {
in->chunkId = -1;
in->valid = 1;
in->variantType = type;
in->yst_mode = mode;
#ifdef CONFIG_YAFFS_WINCE
yfsd_WinFileTimeNow(in->win_atime);
in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
#else
in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
in->yst_rdev = rdev;
in->yst_uid = uid;
in->yst_gid = gid;
#endif
in->nDataChunks = 0;
yaffs_SetObjectName(in, name);
in->dirty = 1;
yaffs_AddObjectToDirectory(parent, in);
in->myDev = parent->myDev;
switch (type) {
case YAFFS_OBJECT_TYPE_SYMLINK:
in->variant.symLinkVariant.alias = str;
break;
case YAFFS_OBJECT_TYPE_HARDLINK:
in->variant.hardLinkVariant.equivalentObject =
equivalentObject;
in->variant.hardLinkVariant.equivalentObjectId =
equivalentObject->objectId;
list_add(&in->hardLinks, &equivalentObject->hardLinks);
break;
case YAFFS_OBJECT_TYPE_FILE:
case YAFFS_OBJECT_TYPE_DIRECTORY:
case YAFFS_OBJECT_TYPE_SPECIAL:
case YAFFS_OBJECT_TYPE_UNKNOWN:
/* do nothing */
break;
}
if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
/* Could not create the object header, fail the creation */
yaffs_DestroyObject(in);
in = NULL;
}
}
return in;
}
yaffs_Object *yaffs_MknodFile(yaffs_Object * parent, const YCHAR * name,
__u32 mode, __u32 uid, __u32 gid)
{
return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
uid, gid, NULL, NULL, 0);
}
yaffs_Object *yaffs_MknodDirectory(yaffs_Object * parent, const YCHAR * name,
__u32 mode, __u32 uid, __u32 gid)
{
return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
mode, uid, gid, NULL, NULL, 0);
}
yaffs_Object *yaffs_MknodSpecial(yaffs_Object * parent, const YCHAR * name,
__u32 mode, __u32 uid, __u32 gid, __u32 rdev)
{
return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
uid, gid, NULL, NULL, rdev);
}
yaffs_Object *yaffs_MknodSymLink(yaffs_Object * parent, const YCHAR * name,
__u32 mode, __u32 uid, __u32 gid,
const YCHAR * alias)
{
return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
uid, gid, NULL, alias, 0);
}
/* yaffs_Link returns the object id of the equivalent object.*/
yaffs_Object *yaffs_Link(yaffs_Object * parent, const YCHAR * name,
yaffs_Object * equivalentObject)
{
/* Get the real object in case we were fed a hard link as an equivalent object */
equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
if (yaffs_MknodObject
(YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
equivalentObject, NULL, 0)) {
return equivalentObject;
} else {
return NULL;
}
}
static int yaffs_ChangeObjectName(yaffs_Object * obj, yaffs_Object * newDir,
const YCHAR * newName, int force, int shadows)
{
int unlinkOp;
int deleteOp;
yaffs_Object *existingTarget;
if (newDir == NULL) {
newDir = obj->parent; /* use the old directory */
}
if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
T(YAFFS_TRACE_ALWAYS,
(TSTR
("tragendy: yaffs_ChangeObjectName: newDir is not a directory"
TENDSTR)));
YBUG();
}
/* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
if (obj->myDev->isYaffs2) {
unlinkOp = (newDir == obj->myDev->unlinkedDir);
} else {
unlinkOp = (newDir == obj->myDev->unlinkedDir
&& obj->variantType == YAFFS_OBJECT_TYPE_FILE);
}
deleteOp = (newDir == obj->myDev->deletedDir);
existingTarget = yaffs_FindObjectByName(newDir, newName);
/* If the object is a file going into the unlinked directory,
* then it is OK to just stuff it in since duplicate names are allowed.
* else only proceed if the new name does not exist and if we're putting
* it into a directory.
*/
if ((unlinkOp ||
deleteOp ||
force ||
(shadows > 0) ||
!existingTarget) &&
newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
yaffs_SetObjectName(obj, newName);
obj->dirty = 1;
yaffs_AddObjectToDirectory(newDir, obj);
if (unlinkOp)
obj->unlinked = 1;
/* If it is a deletion then we mark it as a shrink for gc purposes. */
if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows)>= 0)
return YAFFS_OK;
}
return YAFFS_FAIL;
}
int yaffs_RenameObject(yaffs_Object * oldDir, const YCHAR * oldName,
yaffs_Object * newDir, const YCHAR * newName)
{
yaffs_Object *obj;
yaffs_Object *existingTarget;
int force = 0;
#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
/* Special case for case insemsitive systems (eg. WinCE).
* While look-up is case insensitive, the name isn't.
* Therefore we might want to change x.txt to X.txt
*/
if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0) {
force = 1;
}
#endif
obj = yaffs_FindObjectByName(oldDir, oldName);
/* Check new name to long. */
if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK &&
yaffs_strlen(newName) > YAFFS_MAX_ALIAS_LENGTH)
/* ENAMETOOLONG */
return YAFFS_FAIL;
else if (obj->variantType != YAFFS_OBJECT_TYPE_SYMLINK &&
yaffs_strlen(newName) > YAFFS_MAX_NAME_LENGTH)
/* ENAMETOOLONG */
return YAFFS_FAIL;
if (obj && obj->renameAllowed) {
/* Now do the handling for an existing target, if there is one */
existingTarget = yaffs_FindObjectByName(newDir, newName);
if (existingTarget &&
existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
!list_empty(&existingTarget->variant.directoryVariant.children)) {
/* There is a target that is a non-empty directory, so we fail */
return YAFFS_FAIL; /* EEXIST or ENOTEMPTY */
} else if (existingTarget && existingTarget != obj) {
/* Nuke the target first, using shadowing,
* but only if it isn't the same object
*/
yaffs_ChangeObjectName(obj, newDir, newName, force,
existingTarget->objectId);
yaffs_UnlinkObject(existingTarget);
}
return yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
}
return YAFFS_FAIL;
}
/*------------------------- Block Management and Page Allocation ----------------*/
static int yaffs_InitialiseBlocks(yaffs_Device * dev)
{
int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
dev->blockInfo = NULL;
dev->chunkBits = NULL;
dev->allocationBlock = -1; /* force it to get a new one */
/* If the first allocation strategy fails, thry the alternate one */
dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
if(!dev->blockInfo){
dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
dev->blockInfoAlt = 1;
}
else
dev->blockInfoAlt = 0;
if(dev->blockInfo){
/* Set up dynamic blockinfo stuff. */
dev->chunkBitmapStride = (dev->nChunksPerBlock + 7) / 8; /* round up bytes */
dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
if(!dev->chunkBits){
dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
dev->chunkBitsAlt = 1;
}
else
dev->chunkBitsAlt = 0;
}
if (dev->blockInfo && dev->chunkBits) {
memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
return YAFFS_OK;
}
return YAFFS_FAIL;
}
static void yaffs_DeinitialiseBlocks(yaffs_Device * dev)
{
if(dev->blockInfoAlt && dev->blockInfo)
YFREE_ALT(dev->blockInfo);
else if(dev->blockInfo)
YFREE(dev->blockInfo);
dev->blockInfoAlt = 0;
dev->blockInfo = NULL;
if(dev->chunkBitsAlt && dev->chunkBits)
YFREE_ALT(dev->chunkBits);
else if(dev->chunkBits)
YFREE(dev->chunkBits);
dev->chunkBitsAlt = 0;
dev->chunkBits = NULL;
}
static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device * dev,
yaffs_BlockInfo * bi)
{
int i;
__u32 seq;
yaffs_BlockInfo *b;
if (!dev->isYaffs2)
return 1; /* disqualification only applies to yaffs2. */
if (!bi->hasShrinkHeader)
return 1; /* can gc */
/* Find the oldest dirty sequence number if we don't know it and save it
* so we don't have to keep recomputing it.
*/
if (!dev->oldestDirtySequence) {
seq = dev->sequenceNumber;
for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
i++) {
b = yaffs_GetBlockInfo(dev, i);
if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
(b->pagesInUse - b->softDeletions) <
dev->nChunksPerBlock && b->sequenceNumber < seq) {
seq = b->sequenceNumber;
}
}
dev->oldestDirtySequence = seq;
}
/* Can't do gc of this block if there are any blocks older than this one that have
* discarded pages.
*/
return (bi->sequenceNumber <= dev->oldestDirtySequence);
}
/* FindDiretiestBlock is used to select the dirtiest block (or close enough)
* for garbage collection.
*/
static int yaffs_FindBlockForGarbageCollection(yaffs_Device * dev,
int aggressive)
{
int b = dev->currentDirtyChecker;
int i;
int iterations;
int dirtiest = -1;
int pagesInUse = 0;
int prioritised=0;
yaffs_BlockInfo *bi;
int pendingPrioritisedExist = 0;
/* First let's see if we need to grab a prioritised block */
if(dev->hasPendingPrioritisedGCs){
for(i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++){
bi = yaffs_GetBlockInfo(dev, i);
//yaffs_VerifyBlock(dev,bi,i);
if(bi->gcPrioritise) {
pendingPrioritisedExist = 1;
if(bi->blockState == YAFFS_BLOCK_STATE_FULL &&
yaffs_BlockNotDisqualifiedFromGC(dev, bi)){
pagesInUse = (bi->pagesInUse - bi->softDeletions);
dirtiest = i;
prioritised = 1;
aggressive = 1; /* Fool the non-aggressive skip logiv below */
}
}
}
if(!pendingPrioritisedExist) /* None found, so we can clear this */
dev->hasPendingPrioritisedGCs = 0;
}
/* If we're doing aggressive GC then we are happy to take a less-dirty block, and
* search harder.
* else (we're doing a leasurely gc), then we only bother to do this if the
* block has only a few pages in use.
*/
dev->nonAggressiveSkip--;
if (!aggressive && (dev->nonAggressiveSkip > 0)) {
return -1;
}
if(!prioritised)
pagesInUse =
(aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
if (aggressive) {
iterations =
dev->internalEndBlock - dev->internalStartBlock + 1;
} else {
iterations =
dev->internalEndBlock - dev->internalStartBlock + 1;
iterations = iterations / 16;
if (iterations > 200) {
iterations = 200;
}
}
for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
b++;
if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
b = dev->internalStartBlock;
}
if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
T(YAFFS_TRACE_ERROR,
(TSTR("**>> Block %d is not valid" TENDSTR), b));
YBUG();
}
bi = yaffs_GetBlockInfo(dev, b);
#if 0
if (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT) {
dirtiest = b;
pagesInUse = 0;
}
else
#endif
if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
(bi->pagesInUse - bi->softDeletions) < pagesInUse &&
yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
dirtiest = b;
pagesInUse = (bi->pagesInUse - bi->softDeletions);
}
}
dev->currentDirtyChecker = b;
if (dirtiest > 0) {
T(YAFFS_TRACE_GC,
(TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
dev->nChunksPerBlock - pagesInUse,prioritised));
}
dev->oldestDirtySequence = 0;
if (dirtiest > 0) {
dev->nonAggressiveSkip = 4;
}
return dirtiest;
}
static void yaffs_BlockBecameDirty(yaffs_Device * dev, int blockNo)
{
yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
int erasedOk = 0;
/* If the block is still healthy erase it and mark as clean.
* If the block has had a data failure, then retire it.
*/
T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
(TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
if (!bi->needsRetiring) {
yaffs_InvalidateCheckpoint(dev);
erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
if (!erasedOk) {
dev->nErasureFailures++;
T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
(TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
}
}
if (erasedOk &&
((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
int i;
for (i = 0; i < dev->nChunksPerBlock; i++) {
if (!yaffs_CheckChunkErased
(dev, blockNo * dev->nChunksPerBlock + i)) {
T(YAFFS_TRACE_ERROR,
(TSTR
(">>Block %d erasure supposedly OK, but chunk %d not erased"
TENDSTR), blockNo, i));
}
}
}
if (erasedOk) {
/* Clean it up... */
bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
dev->nErasedBlocks++;
bi->pagesInUse = 0;
bi->softDeletions = 0;
bi->hasShrinkHeader = 0;
bi->skipErasedCheck = 1; /* This is clean, so no need to check */
bi->gcPrioritise = 0;
yaffs_ClearChunkBits(dev, blockNo);
T(YAFFS_TRACE_ERASE,
(TSTR("Erased block %d" TENDSTR), blockNo));
} else {
dev->nFreeChunks -= dev->nChunksPerBlock; /* We lost a block of free space */
yaffs_RetireBlock(dev, blockNo);
T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
(TSTR("**>> Block %d retired" TENDSTR), blockNo));
}
}
static int yaffs_FindBlockForAllocation(yaffs_Device * dev)
{
int i;
yaffs_BlockInfo *bi;
if (dev->nErasedBlocks < 1) {
/* Hoosterman we've got a problem.
* Can't get space to gc
*/
T(YAFFS_TRACE_ERROR,
(TSTR("yaffs tragedy: no more eraased blocks" TENDSTR)));
return -1;
}
/* Find an empty block. */
for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
dev->allocationBlockFinder++;
if (dev->allocationBlockFinder < dev->internalStartBlock
|| dev->allocationBlockFinder > dev->internalEndBlock) {
dev->allocationBlockFinder = dev->internalStartBlock;
}
bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
dev->sequenceNumber++;
bi->sequenceNumber = dev->sequenceNumber;
dev->nErasedBlocks--;
T(YAFFS_TRACE_ALLOCATE,
(TSTR("Allocated block %d, seq %d, %d left" TENDSTR),
dev->allocationBlockFinder, dev->sequenceNumber,
dev->nErasedBlocks));
return dev->allocationBlockFinder;
}
}
T(YAFFS_TRACE_ALWAYS,
(TSTR
("yaffs tragedy: no more eraased blocks, but there should have been %d"
TENDSTR), dev->nErasedBlocks));
return -1;
}
// Check if there's space to allocate...
// Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
static int yaffs_CheckSpaceForAllocation(yaffs_Device * dev)
{
int reservedChunks;
int reservedBlocks = dev->nReservedBlocks;
int checkpointBlocks;
checkpointBlocks = dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint;
if(checkpointBlocks < 0)
checkpointBlocks = 0;
reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->nChunksPerBlock);
return (dev->nFreeChunks > reservedChunks);
}
static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve, yaffs_BlockInfo **blockUsedPtr)
{
int retVal;
yaffs_BlockInfo *bi;
if (dev->allocationBlock < 0) {
/* Get next block to allocate off */
dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
dev->allocationPage = 0;
}
if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
/* Not enough space to allocate unless we're allowed to use the reserve. */
return -1;
}
if (dev->nErasedBlocks < dev->nReservedBlocks
&& dev->allocationPage == 0) {
T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
}
/* Next page please.... */
if (dev->allocationBlock >= 0) {
bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
dev->allocationPage;
bi->pagesInUse++;
yaffs_SetChunkBit(dev, dev->allocationBlock,
dev->allocationPage);
dev->allocationPage++;
dev->nFreeChunks--;
/* If the block is full set the state to full */
if (dev->allocationPage >= dev->nChunksPerBlock) {
bi->blockState = YAFFS_BLOCK_STATE_FULL;
dev->allocationBlock = -1;
}
if(blockUsedPtr)
*blockUsedPtr = bi;
return retVal;
}
T(YAFFS_TRACE_ERROR,
(TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
return -1;
}
static int yaffs_GetErasedChunks(yaffs_Device * dev)
{
int n;
n = dev->nErasedBlocks * dev->nChunksPerBlock;
if (dev->allocationBlock > 0) {
n += (dev->nChunksPerBlock - dev->allocationPage);
}
return n;
}
static int yaffs_GarbageCollectBlock(yaffs_Device * dev, int block)
{
int oldChunk;
int newChunk;
int chunkInBlock;
int markNAND;
int retVal = YAFFS_OK;
int cleanups = 0;
int i;
int isCheckpointBlock;
int matchingChunk;
int chunksBefore = yaffs_GetErasedChunks(dev);
int chunksAfter;
yaffs_ExtendedTags tags;
yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
yaffs_Object *object;
isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
T(YAFFS_TRACE_TRACING,
(TSTR("Collecting block %d, in use %d, shrink %d, " TENDSTR), block,
bi->pagesInUse, bi->hasShrinkHeader));
/*yaffs_VerifyFreeChunks(dev); */
bi->hasShrinkHeader = 0; /* clear the flag so that the block can erase */
/* Take off the number of soft deleted entries because
* they're going to get really deleted during GC.
*/
dev->nFreeChunks -= bi->softDeletions;
dev->isDoingGC = 1;
if (isCheckpointBlock ||
!yaffs_StillSomeChunkBits(dev, block)) {
T(YAFFS_TRACE_TRACING,
(TSTR
("Collecting block %d that has no chunks in use" TENDSTR),
block));
yaffs_BlockBecameDirty(dev, block);
} else {
__u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
yaffs_VerifyBlock(dev,bi,block);
for (chunkInBlock = 0, oldChunk = block * dev->nChunksPerBlock;
chunkInBlock < dev->nChunksPerBlock
&& yaffs_StillSomeChunkBits(dev, block);
chunkInBlock++, oldChunk++) {
if (yaffs_CheckChunkBit(dev, block, chunkInBlock)) {
/* This page is in use and might need to be copied off */
markNAND = 1;
yaffs_InitialiseTags(&tags);
yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
buffer, &tags);
object =
yaffs_FindObjectByNumber(dev,
tags.objectId);
T(YAFFS_TRACE_GC_DETAIL,
(TSTR
("Collecting page %d, %d %d %d " TENDSTR),
chunkInBlock, tags.objectId, tags.chunkId,
tags.byteCount));
if(object && !yaffs_SkipVerification(dev)){
if(tags.chunkId == 0)
matchingChunk = object->chunkId;
else if(object->softDeleted)
matchingChunk = oldChunk; /* Defeat the test */
else
matchingChunk = yaffs_FindChunkInFile(object,tags.chunkId,NULL);
if(oldChunk != matchingChunk)
T(YAFFS_TRACE_ERROR,
(TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
oldChunk,matchingChunk,tags.objectId, tags.chunkId));
}
if (!object) {
T(YAFFS_TRACE_ERROR,
(TSTR
("page %d in gc has no object: %d %d %d "
TENDSTR), oldChunk,
tags.objectId, tags.chunkId, tags.byteCount));
}
if (object && object->deleted
&& tags.chunkId != 0) {
/* Data chunk in a deleted file, throw it away
* It's a soft deleted data chunk,
* No need to copy this, just forget about it and
* fix up the object.
*/
object->nDataChunks--;
if (object->nDataChunks <= 0) {
/* remeber to clean up the object */
dev->gcCleanupList[cleanups] =
tags.objectId;
cleanups++;
}
markNAND = 0;
} else if (0
/* Todo object && object->deleted && object->nDataChunks == 0 */
) {
/* Deleted object header with no data chunks.
* Can be discarded and the file deleted.
*/
object->chunkId = 0;
yaffs_FreeTnode(object->myDev,
object->variant.
fileVariant.top);
object->variant.fileVariant.top = NULL;
yaffs_DoGenericObjectDeletion(object);
} else if (object) {
/* It's either a data chunk in a live file or
* an ObjectHeader, so we're interested in it.
* NB Need to keep the ObjectHeaders of deleted files
* until the whole file has been deleted off
*/
tags.serialNumber++;
dev->nGCCopies++;
if (tags.chunkId == 0) {
/* It is an object Id,
* We need to nuke the shrinkheader flags first
* We no longer want the shrinkHeader flag since its work is done
* and if it is left in place it will mess up scanning.
* Also, clear out any shadowing stuff
*/
yaffs_ObjectHeader *oh;
oh = (yaffs_ObjectHeader *)buffer;
oh->isShrink = 0;
oh->shadowsObject = -1;
tags.extraShadows = 0;
tags.extraIsShrinkHeader = 0;
yaffs_VerifyObjectHeader(object,oh,&tags,1);
}
newChunk =
yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
if (newChunk < 0) {
retVal = YAFFS_FAIL;
} else {
/* Ok, now fix up the Tnodes etc. */
if (tags.chunkId == 0) {
/* It's a header */
object->chunkId = newChunk;
object->serial = tags.serialNumber;
} else {
/* It's a data chunk */
yaffs_PutChunkIntoFile
(object,
tags.chunkId,
newChunk, 0);
}
}
}
yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
}
}
yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
/* Do any required cleanups */
for (i = 0; i < cleanups; i++) {
/* Time to delete the file too */
object =
yaffs_FindObjectByNumber(dev,
dev->gcCleanupList[i]);
if (object) {
yaffs_FreeTnode(dev,
object->variant.fileVariant.
top);
object->variant.fileVariant.top = NULL;
T(YAFFS_TRACE_GC,
(TSTR
("yaffs: About to finally delete object %d"
TENDSTR), object->objectId));
yaffs_DoGenericObjectDeletion(object);
object->myDev->nDeletedFiles--;
}
}
}
yaffs_VerifyCollectedBlock(dev,bi,block);
if (chunksBefore >= (chunksAfter = yaffs_GetErasedChunks(dev))) {
T(YAFFS_TRACE_GC,
(TSTR
("gc did not increase free chunks before %d after %d"
TENDSTR), chunksBefore, chunksAfter));
}
dev->isDoingGC = 0;
return retVal;
}
/* New garbage collector
* If we're very low on erased blocks then we do aggressive garbage collection
* otherwise we do "leasurely" garbage collection.
* Aggressive gc looks further (whole array) and will accept less dirty blocks.
* Passive gc only inspects smaller areas and will only accept more dirty blocks.
*
* The idea is to help clear out space in a more spread-out manner.
* Dunno if it really does anything useful.
*/
static int yaffs_CheckGarbageCollection(yaffs_Device * dev)
{
int block;
int aggressive;
int gcOk = YAFFS_OK;
int maxTries = 0;
int checkpointBlockAdjust;
if (dev->isDoingGC) {
/* Bail out so we don't get recursive gc */
return YAFFS_OK;
}
/* This loop should pass the first time.
* We'll only see looping here if the erase of the collected block fails.
*/
do {
maxTries++;
checkpointBlockAdjust = (dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint);
if(checkpointBlockAdjust < 0)
checkpointBlockAdjust = 0;
if (dev->nErasedBlocks < (dev->nReservedBlocks + checkpointBlockAdjust + 2)) {
/* We need a block soon...*/
aggressive = 1;
} else {
/* We're in no hurry */
aggressive = 0;
}
block = yaffs_FindBlockForGarbageCollection(dev, aggressive);
if (block > 0) {
dev->garbageCollections++;
if (!aggressive) {
dev->passiveGarbageCollections++;
}
T(YAFFS_TRACE_GC,
(TSTR
("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
dev->nErasedBlocks, aggressive));
gcOk = yaffs_GarbageCollectBlock(dev, block);
}
if (dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0) {
T(YAFFS_TRACE_GC,
(TSTR
("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
TENDSTR), dev->nErasedBlocks, maxTries, block));
}
} while ((dev->nErasedBlocks < dev->nReservedBlocks) && (block > 0)
&& (maxTries < 2));
return aggressive ? gcOk : YAFFS_OK;
}
/*------------------------- TAGS --------------------------------*/
static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
int chunkInObject)
{
return (tags->chunkId == chunkInObject &&
tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
}
/*-------------------- Data file manipulation -----------------*/
static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
yaffs_ExtendedTags * tags)
{
/*Get the Tnode, then get the level 0 offset chunk offset */
yaffs_Tnode *tn;
int theChunk = -1;
yaffs_ExtendedTags localTags;
int retVal = -1;
yaffs_Device *dev = in->myDev;
if (!tags) {
/* Passed a NULL, so use our own tags space */
tags = &localTags;
}
tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
if (tn) {
theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
retVal =
yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
chunkInInode);
}
return retVal;
}
static int yaffs_FindAndDeleteChunkInFile(yaffs_Object * in, int chunkInInode,
yaffs_ExtendedTags * tags)
{
/* Get the Tnode, then get the level 0 offset chunk offset */
yaffs_Tnode *tn;
int theChunk = -1;
yaffs_ExtendedTags localTags;
yaffs_Device *dev = in->myDev;
int retVal = -1;
if (!tags) {
/* Passed a NULL, so use our own tags space */
tags = &localTags;
}
tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
if (tn) {
theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
retVal =
yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
chunkInInode);
/* Delete the entry in the filestructure (if found) */
if (retVal != -1) {
yaffs_PutLevel0Tnode(dev,tn,chunkInInode,0);
}
} else {
/*T(("No level 0 found for %d\n", chunkInInode)); */
}
if (retVal == -1) {
/* T(("Could not find %d to delete\n",chunkInInode)); */
}
return retVal;
}
#ifdef YAFFS_PARANOID
static int yaffs_CheckFileSanity(yaffs_Object * in)
{
int chunk;
int nChunks;
int fSize;
int failed = 0;
int objId;
yaffs_Tnode *tn;
yaffs_Tags localTags;
yaffs_Tags *tags = &localTags;
int theChunk;
int chunkDeleted;
if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
/* T(("Object not a file\n")); */
return YAFFS_FAIL;
}
objId = in->objectId;
fSize = in->variant.fileVariant.fileSize;
nChunks =
(fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
for (chunk = 1; chunk <= nChunks; chunk++) {
tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
chunk);
if (tn) {
theChunk = yaffs_GetChunkGroupBase(dev,tn,chunk);
if (yaffs_CheckChunkBits
(dev, theChunk / dev->nChunksPerBlock,
theChunk % dev->nChunksPerBlock)) {
yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
tags,
&chunkDeleted);
if (yaffs_TagsMatch
(tags, in->objectId, chunk, chunkDeleted)) {
/* found it; */
}
} else {
failed = 1;
}
} else {
/* T(("No level 0 found for %d\n", chunk)); */
}
}
return failed ? YAFFS_FAIL : YAFFS_OK;
}
#endif
static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
int chunkInNAND, int inScan)
{
/* NB inScan is zero unless scanning.
* For forward scanning, inScan is > 0;
* for backward scanning inScan is < 0
*/
yaffs_Tnode *tn;
yaffs_Device *dev = in->myDev;
int existingChunk;
yaffs_ExtendedTags existingTags;
yaffs_ExtendedTags newTags;
unsigned existingSerial, newSerial;
if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
/* Just ignore an attempt at putting a chunk into a non-file during scanning
* If it is not during Scanning then something went wrong!
*/
if (!inScan) {
T(YAFFS_TRACE_ERROR,
(TSTR
("yaffs tragedy:attempt to put data chunk into a non-file"
TENDSTR)));
YBUG();
}