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ara-mdk / platform / external / yaffs2 / f122d1cb99f0f510625c11fb3f6d3e47adaf585c / . / yaffs2 / yaffs_guts.c
blob: 26e7864f4cddcca042739539275d85200087a2bc [file] [log] [blame]
/*
* YAFFS: Yet another FFS. A NAND-flash specific file system.
*
* Copyright (C) 2002 Aleph One Ltd.
* for Toby Churchill Ltd and Brightstar Engineering
*
* Created by Charles Manning <charles@aleph1.co.uk>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
const char *yaffs_guts_c_version =
"$Id: yaffs_guts.c,v 1.40 2006/10/13 08:52:49 charles Exp $";
#include "yportenv.h"
#include "yaffsinterface.h"
#include "yaffs_guts.h"
#include "yaffs_tagsvalidity.h"
#include "yaffs_tagscompat.h"
#ifndef CONFIG_YAFFS_OWN_SORT
#include "yaffs_qsort.h"
#endif
#include "yaffs_nand.h"
#include "yaffs_checkptrw.h"
#include "yaffs_nand.h"
#include "yaffs_packedtags2.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_DeleteWorker(yaffs_Object * in, yaffs_Tnode * tn, __u32 level,
int chunkOffset, int *limit);
static int yaffs_DoGenericObjectDeletion(yaffs_Object * in);
static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device * dev, int blockNo);
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);
#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);
/* 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 __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_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);
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);
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);
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;
}
/*
* Simple hash function. Needs to have a reasonable spread
*/
static Y_INLINE int yaffs_HashFunction(int n)
{
n = abs(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;
int result;
result = 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 chunk;
int writeOk = 0;
int erasedOk = 1;
int attempts = 0;
yaffs_BlockInfo *bi;
yaffs_InvalidateCheckpoint(dev);
do {
chunk = yaffs_AllocateChunk(dev, useReserve,&bi);
if (chunk >= 0) {
/* 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__);
} else {
#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
bi->skipErasedCheck = 0;
#endif
if(!bi->skipErasedCheck){
erasedOk = yaffs_CheckChunkErased(dev, chunk);
if(erasedOk && !bi->gcPrioritise)
bi->skipErasedCheck = 1;
}
if (!erasedOk) {
T(YAFFS_TRACE_ERROR,
(TSTR
("**>> yaffs chunk %d was not erased"
TENDSTR), chunk));
} else {
writeOk =
yaffs_WriteChunkWithTagsToNAND(dev, chunk,
data, tags);
}
attempts++;
if (writeOk) {
/*
* Copy the data into the robustification buffer.
* NB We do this at the end to prevent duplicates in the case of a write error.
* Todo
*/
yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
} else {
/* The erased check or write failed */
yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
}
}
}
} while (chunk >= 0 && !writeOk);
if (attempts > 1) {
T(YAFFS_TRACE_ERROR,
(TSTR("**>> yaffs write required %d attempts" TENDSTR),
attempts));
dev->nRetriedWrites += (attempts - 1);
}
return chunk;
}
/*
* Block retiring for handling a broken block.
*/
static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND)
{
yaffs_InvalidateCheckpoint(dev);
yaffs_MarkBlockBad(dev, blockInNAND);
yaffs_GetBlockInfo(dev, blockInNAND)->blockState =
YAFFS_BLOCK_STATE_DEAD;
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;
}
/* 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)) {
#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)));
} 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));
}
}
__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;
}
/* DeleteWorker scans backwards through the tnode tree and deletes all the
* chunks and tnodes in the file
* Returns 1 if the tree was deleted.
* Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
*/
static int yaffs_DeleteWorker(yaffs_Object * in, yaffs_Tnode * tn, __u32 level,
int chunkOffset, int *limit)
{
int i;
int chunkInInode;
int theChunk;
yaffs_ExtendedTags tags;
int foundChunk;
yaffs_Device *dev = in->myDev;
int allDone = 1;
if (tn) {
if (level > 0) {
for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
i--) {
if (tn->internal[i]) {
if (limit && (*limit) < 0) {
allDone = 0;
} else {
allDone =
yaffs_DeleteWorker(in,
tn->
internal
[i],
level -
1,
(chunkOffset
<<
YAFFS_TNODES_INTERNAL_BITS)
+ i,
limit);
}
if (allDone) {
yaffs_FreeTnode(dev,
tn->
internal[i]);
tn->internal[i] = NULL;
}
}
}
return (allDone) ? 1 : 0;
} else if (level == 0) {
int hitLimit = 0;
for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
i--) {
theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
if (theChunk) {
chunkInInode =
(chunkOffset <<
YAFFS_TNODES_LEVEL0_BITS) + i;
foundChunk =
yaffs_FindChunkInGroup(dev,
theChunk,
&tags,
in->objectId,
chunkInInode);
if (foundChunk > 0) {
yaffs_DeleteChunk(dev,
foundChunk, 1,
__LINE__);
in->nDataChunks--;
if (limit) {
*limit = *limit - 1;
if (*limit <= 0) {
hitLimit = 1;
}
}
}
yaffs_PutLevel0Tnode(dev,tn,i,0);
}
}
return (i < 0) ? 1 : 0;
}
}
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));
if (!newObjects) {
T(YAFFS_TRACE_ALLOCATE,
(TSTR("yaffs: Could not allocate more objects" TENDSTR)));
return YAFFS_FAIL;
}
/* Hook them into the free list */
for (i = 0; i < nObjects - 1; i++) {
newObjects[i].siblings.next =
(struct list_head *)(&newObjects[i + 1]);
}
newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
dev->freeObjects = newObjects;
dev->nFreeObjects += nObjects;
dev->nObjectsCreated += nObjects;
/* Now add this bunch of Objects to a list for freeing up. */
list = YMALLOC(sizeof(yaffs_ObjectList));
if (!list) {
T(YAFFS_TRACE_ALLOCATE,
(TSTR("Could not add objects to management list" TENDSTR)));
} else {
list->objects = newObjects;
list->next = dev->allocatedObjectList;
dev->allocatedObjectList = list;
}
return YAFFS_OK;
}
/* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device * dev)
{
yaffs_Object *tn = NULL;
/* If there are none left make more */
if (!dev->freeObjects) {
yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
}
if (dev->freeObjects) {
tn = dev->freeObjects;
dev->freeObjects =
(yaffs_Object *) (dev->freeObjects->siblings.next);
dev->nFreeObjects--;
/* Now sweeten it up... */
memset(tn, 0, sizeof(yaffs_Object));
tn->myDev = dev;
tn->chunkId = -1;
tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
INIT_LIST_HEAD(&(tn->hardLinks));
INIT_LIST_HEAD(&(tn->hashLink));
INIT_LIST_HEAD(&tn->siblings);
/* Add it to the lost and found directory.
* NB Can't put root or lostNFound in lostNFound so
* check if lostNFound exists first
*/
if (dev->lostNFoundDir) {
yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
}
}
return tn;
}
static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device * dev, int number,
__u32 mode)
{
yaffs_Object *obj =
yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
if (obj) {
obj->fake = 1; /* it is fake so it has no NAND presence... */
obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
obj->unlinkAllowed = 0; /* ... or unlink it */
obj->deleted = 0;
obj->unlinked = 0;
obj->yst_mode = mode;
obj->myDev = dev;
obj->chunkId = 0; /* Not a valid chunk. */
}
return obj;
}
static void yaffs_UnhashObject(yaffs_Object * tn)
{
int bucket;
yaffs_Device *dev = tn->myDev;
/* If it is still linked into the bucket list, free from the list */
if (!list_empty(&tn->hashLink)) {
list_del_init(&tn->hashLink);
bucket = yaffs_HashFunction(tn->objectId);
dev->objectBucket[bucket].count--;
}
}
/* FreeObject frees up a Object and puts it back on the free list */
static void yaffs_FreeObject(yaffs_Object * tn)
{
yaffs_Device *dev = tn->myDev;
#ifdef __KERNEL__
if (tn->myInode) {
/* We're still hooked up to a cached inode.
* Don't delete now, but mark for later deletion
*/
tn->deferedFree = 1;
return;
}
#endif
yaffs_UnhashObject(tn);
/* Link into the free list. */
tn->siblings.next = (struct list_head *)(dev->freeObjects);
dev->freeObjects = tn;
dev->nFreeObjects++;
}
#ifdef __KERNEL__
void yaffs_HandleDeferedFree(yaffs_Object * obj)
{
if (obj->deferedFree) {
yaffs_FreeObject(obj);
}
}
#endif
static void yaffs_DeinitialiseObjects(yaffs_Device * dev)
{
/* Free the list of allocated Objects */
yaffs_ObjectList *tmp;
while (dev->allocatedObjectList) {
tmp = dev->allocatedObjectList->next;
YFREE(dev->allocatedObjectList->objects);
YFREE(dev->allocatedObjectList);
dev->allocatedObjectList = tmp;
}
dev->freeObjects = NULL;
dev->nFreeObjects = 0;
}
static void yaffs_InitialiseObjects(yaffs_Device * dev)
{
int i;
dev->allocatedObjectList = NULL;
dev->freeObjects = NULL;
dev->nFreeObjects = 0;
for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
INIT_LIST_HEAD(&dev->objectBucket[i].list);
dev->objectBucket[i].count = 0;
}
}
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) {
#ifdef __KERNEL__
/* Don't tell the VFS about this one if it is defered free */
if (in->deferedFree)
return NULL;
#endif
return in;
}
}
}
return NULL;
}
yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
yaffs_ObjectType type)
{
yaffs_Object *theObject;
if (number < 0) {
number = yaffs_CreateNewObjectNumber(dev);
}
theObject = yaffs_AllocateEmptyObject(dev);
if (theObject) {
theObject->fake = 0;
theObject->renameAllowed = 1;
theObject->unlinkAllowed = 1;
theObject->objectId = number;
yaffs_HashObject(theObject);
theObject->variantType = type;
#ifdef CONFIG_YAFFS_WINCE
yfsd_WinFileTimeNow(theObject->win_atime);
theObject->win_ctime[0] = theObject->win_mtime[0] =
theObject->win_atime[0];
theObject->win_ctime[1] = theObject->win_mtime[1] =
theObject->win_atime[1];
#else
theObject->yst_atime = theObject->yst_mtime =
theObject->yst_ctime = Y_CURRENT_TIME;
#endif
switch (type) {
case YAFFS_OBJECT_TYPE_FILE:
theObject->variant.fileVariant.fileSize = 0;
theObject->variant.fileVariant.scannedFileSize = 0;
theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
theObject->variant.fileVariant.topLevel = 0;
theObject->variant.fileVariant.top =
yaffs_GetTnode(dev);
break;
case YAFFS_OBJECT_TYPE_DIRECTORY:
INIT_LIST_HEAD(&theObject->variant.directoryVariant.
children);
break;
case YAFFS_OBJECT_TYPE_SYMLINK:
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));
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;
yaffs_Device *dev = parent->myDev;
/* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
if (yaffs_FindObjectByName(parent, name)) {
return NULL;
}
in = yaffs_CreateNewObject(dev, -1, type);
if (in) {
in->chunkId = -1;
in->valid = 1;
in->variantType = type;
in->yst_mode = mode;
#ifdef CONFIG_YAFFS_WINCE
yfsd_WinFileTimeNow(in->win_atime);
in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
#else
in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
in->yst_rdev = rdev;
in->yst_uid = uid;
in->yst_gid = gid;
#endif
in->nDataChunks = 0;
yaffs_SetObjectName(in, name);
in->dirty = 1;
yaffs_AddObjectToDirectory(parent, in);
in->myDev = parent->myDev;
switch (type) {
case YAFFS_OBJECT_TYPE_SYMLINK:
in->variant.symLinkVariant.alias =
yaffs_CloneString(aliasString);
break;
case YAFFS_OBJECT_TYPE_HARDLINK:
in->variant.hardLinkVariant.equivalentObject =
equivalentObject;
in->variant.hardLinkVariant.equivalentObjectId =
equivalentObject->objectId;
list_add(&in->hardLinks, &equivalentObject->hardLinks);
break;
case YAFFS_OBJECT_TYPE_FILE:
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->allocationBlock = -1; /* force it to get a new one */
/* Todo we're assuming the malloc will pass. */
dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
if(!dev->blockInfo){
dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
dev->blockInfoAlt = 1;
}
else
dev->blockInfoAlt = 0;
/* 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)
YFREE_ALT(dev->blockInfo);
else
YFREE(dev->blockInfo);
dev->blockInfoAlt = 0;
dev->blockInfo = NULL;
if(dev->chunkBitsAlt)
YFREE_ALT(dev->chunkBits);
else
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);
return 1;
}
/* 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;
int prioritised=0;
yaffs_BlockInfo *bi;
static int nonAggressiveSkip = 0;
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);
if(bi->gcPrioritise)
pendingPrioritisedExist = 1;
if(bi->blockState == YAFFS_BLOCK_STATE_FULL &&
bi->gcPrioritise &&
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.
*/
nonAggressiveSkip--;
if (!aggressive && (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) {
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.
*/
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)) {
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 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__);
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) {
T(YAFFS_TRACE_ERROR,
(TSTR
("page %d in gc has no object "
TENDSTR), oldChunk));
}
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;
}
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--;
}
}
}
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 YAFFS_OK;
}
/* 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)) {
/* 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();
}
yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
return YAFFS_OK;
}
tn = yaffs_AddOrFindLevel0Tnode(dev,
&in->variant.fileVariant,
chunkInInode,
NULL);
if (!tn) {
return YAFFS_FAIL;
}
existingChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
if (inScan != 0) {
/* If we're scanning then we need to test for duplicates
* NB This does not need to be efficient since it should only ever
* happen when the power fails during a write, then only one
* chunk should ever be affected.
*
* Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
* Update: For backward scanning we don't need to re-read tags so this is quite cheap.
*/
if (existingChunk != 0) {
/* NB Right now existing chunk will not be real chunkId if the device >= 32MB
* thus we have to do a FindChunkInFile to get the real chunk id.
*
* We have a duplicate now we need to decide which one to use:
*
* Backwards scanning YAFFS2: The old one is what we use, dump the new one.
* Forward scanning YAFFS2: The new one is what we use, dump the old one.
* YAFFS1: Get both sets of tags and compare serial numbers.
*/
if (inScan > 0) {
/* Only do this for forward scanning */
yaffs_ReadChunkWithTagsFromNAND(dev,
chunkInNAND,
NULL, &newTags);
/* Do a proper find */
existingChunk =
yaffs_FindChunkInFile(in, chunkInInode,
&existingTags);
}
if (existingChunk <= 0) {
/*Hoosterman - how did this happen? */
T(YAFFS_TRACE_ERROR,
(TSTR
("yaffs tragedy: existing chunk < 0 in scan"
TENDSTR)));
}
/* NB The deleted flags should be false, otherwise the chunks will
* not be loaded during a scan
*/
newSerial = newTags.serialNumber;
existingSerial = existingTags.serialNumber;
if ((inScan > 0) &&
(in->myDev->isYaffs2 ||
existingChunk <= 0 ||
((existingSerial + 1) & 3) == newSerial)) {
/* Forward scanning.
* Use new
* Delete the old one and drop through to update the tnode
*/
yaffs_DeleteChunk(dev, existingChunk, 1,
__LINE__);
} else {
/* Backward scanning or we want to use the existing one
* Use existing.
* Delete the new one and return early so that the tnode isn't changed
*/
yaffs_DeleteChunk(dev, chunkInNAND, 1,
__LINE__);
return YAFFS_OK;
}
}
}
if (existingChunk == 0) {
in->nDataChunks++;
}
yaffs_PutLevel0Tnode(dev,tn,chunkInInode,chunkInNAND);
return YAFFS_OK;
}
static int yaffs_ReadChunkDataFromObject(yaffs_Object * in, int chunkInInode,
__u8 * buffer)
{
int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
if (chunkInNAND >= 0) {
return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
buffer,NULL);
} else {
T(YAFFS_TRACE_NANDACCESS,
(TSTR("Chunk %d not found zero instead" TENDSTR),
chunkInNAND));
/* get sane (zero) data if you read a hole */
memset(buffer, 0, in->myDev->nDataBytesPerChunk);
return 0;
}
}
void yaffs_DeleteChunk(yaffs_Device * dev, int chunkId, int markNAND, int lyn)
{
int block;
int page;
yaffs_ExtendedTags tags;
yaffs_BlockInfo *bi;
if (chunkId <= 0)
return;
dev->nDeletions++;
block = chunkId / dev->nChunksPerBlock;
page = chunkId % dev->nChunksPerBlock;
bi = yaffs_GetBlockInfo(dev, block);
T(YAFFS_TRACE_DELETION,
(TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
if (markNAND &&
bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->isYaffs2) {
yaffs_InitialiseTags(&tags);
tags.chunkDeleted = 1;
yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
yaffs_HandleUpdateChunk(dev, chunkId, &tags);
} else {
dev->nUnmarkedDeletions++;
}
/* Pull out of the management area.
* If the whole block became dirty, this will kick off an erasure.
*/
if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
bi->blockState == YAFFS_BLOCK_STATE_FULL ||
bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
dev->nFreeChunks++;
yaffs_ClearChunkBit(dev, block, page);
bi->pagesInUse--;
if (bi->pagesInUse == 0 &&
!bi->hasShrinkHeader &&
bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
yaffs_BlockBecameDirty(dev, block);
}
} else {
/* T(("Bad news deleting chunk %d\n",chunkId)); */
}
}
static int yaffs_WriteChunkDataToObject(yaffs_Object * in, int chunkInInode,
const __u8 * buffer, int nBytes,
int useReserve)
{
/* Find old chunk Need to do this to get serial number
* Write new one and patch into tree.
* Invalidate old tags.
*/
int prevChunkId;
yaffs_ExtendedTags prevTags;
int newChunkId;
yaffs_ExtendedTags newTags;
yaffs_Device *dev = in->myDev;
yaffs_CheckGarbageCollection(dev);
/* Get the previous chunk at this location in the file if it exists */
prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
/* Set up new tags */
yaffs_InitialiseTags(&newTags);
newTags.chunkId = chunkInInode;
newTags.objectId = in->objectId;
newTags.serialNumber =
(prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;
newTags.byteCount = nBytes;
newChunkId =
yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
useReserve);
if (newChunkId >= 0) {
yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
if (prevChunkId >= 0) {
yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
}
yaffs_CheckFileSanity(in);
}
return newChunkId;
}
/* UpdateObjectHeader updates the header on NAND for an object.
* If name is not NULL, then that new name is used.
*/
int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name, int force,
int isShrink, int shadows)
{
yaffs_BlockInfo *bi;
yaffs_Device *dev = in->myDev;
int prevChunkId;
int retVal = 0;
int result = 0;
int newChunkId;
yaffs_ExtendedTags newTags;
__u8 *buffer = NULL;
YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
yaffs_ObjectHeader *oh = NULL;
if (!in->fake || force) {
yaffs_CheckGarbageCollection(dev);
buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
oh = (yaffs_ObjectHeader *) buffer;
prevChunkId = in->chunkId;
if (prevChunkId >= 0) {
result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
buffer, NULL);
memcpy(oldName, oh->name, sizeof(oh->name));
}
memset(buffer, 0xFF, dev->nDataBytesPerChunk);
oh->type = in->variantType;
oh->yst_mode = in->yst_mode;
oh->shadowsObject = shadows;
#ifdef CONFIG_YAFFS_WINCE
oh->win_atime[0] = in->win_atime[0];
oh->win_ctime[0] = in->win_ctime[0];
oh->win_mtime[0] = in->win_mtime[0];
oh->win_atime[1] = in->win_atime[1];
oh->win_ctime[1] = in->win_ctime[1];
oh->win_mtime[1] = in->win_mtime[1];
#else
oh->yst_uid = in->yst_uid;
oh->yst_gid = in->yst_gid;
oh->yst_atime = in->yst_atime;
oh->yst_mtime = in->yst_mtime;
oh->yst_ctime = in->yst_ctime;
oh->yst_rdev = in->yst_rdev;
#endif
if (in->parent) {
oh->parentObjectId = in->parent->objectId;
} else {
oh->parentObjectId = 0;
}
if (name && *name) {
memset(oh->name, 0, sizeof(oh->name));
yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
} else if (prevChunkId) {
memcpy(oh->name, oldName, sizeof(oh->name));
} else {
memset(oh->name, 0, sizeof(oh->name));
}
oh->isShrink = isShrink;
switch (in->variantType) {
case YAFFS_OBJECT_TYPE_UNKNOWN:
/* Should not happen */
break;
case YAFFS_OBJECT_TYPE_FILE:
oh->fileSize =
(oh->parentObjectId == YAFFS_OBJECTID_DELETED
|| oh->parentObjectId ==
YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
fileVariant.fileSize;
break;
case YAFFS_OBJECT_TYPE_HARDLINK:
oh->equivalentObjectId =
in->variant.hardLinkVariant.equivalentObjectId;
break;
case YAFFS_OBJECT_TYPE_SPECIAL:
/* Do nothing */
break;
case YAFFS_OBJECT_TYPE_DIRECTORY:
/* Do nothing */
break;
case YAFFS_OBJECT_TYPE_SYMLINK:
yaffs_strncpy(oh->alias,
in->variant.symLinkVariant.alias,
YAFFS_MAX_ALIAS_LENGTH);
oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
break;
}
/* Tags */
yaffs_InitialiseTags(&newTags);
in->serial++;
newTags.chunkId = 0;
newTags.objectId = in->objectId;
newTags.serialNumber = in->serial;
/* Add extra info for file header */
newTags.extraHeaderInfoAvailable = 1;
newTags.extraParentObjectId = oh->parentObjectId;
newTags.extraFileLength = oh->fileSize;
newTags.extraIsShrinkHeader = oh->isShrink;
newTags.extraEquivalentObjectId = oh->equivalentObjectId;
newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
newTags.extraObjectType = in->variantType;
/* Create new chunk in NAND */
newChunkId =
yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
(prevChunkId >= 0) ? 1 : 0);
if (newChunkId >= 0) {
in->chunkId = newChunkId;
if (prevChunkId >= 0) {
yaffs_DeleteChunk(dev, prevChunkId, 1,
__LINE__);
}
if(!yaffs_ObjectHasCachedWriteData(in))
in->dirty = 0;
/* If this was a shrink, then mark the block that the chunk lives on */
if (isShrink) {
bi = yaffs_GetBlockInfo(in->myDev,
newChunkId /in->myDev-> nChunksPerBlock);
bi->hasShrinkHeader = 1;
}
}
retVal = newChunkId;
}
if (buffer)
yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
return retVal;
}
/*------------------------ Short Operations Cache ----------------------------------------
* In many situations where there is no high level buffering (eg WinCE) a lot of
* reads might be short sequential reads, and a lot of writes may be short
* sequential writes. eg. scanning/writing a jpeg file.
* In these cases, a short read/write cache can provide a huge perfomance benefit
* with dumb-as-a-rock code.
* In Linux, the page cache provides read buffering aand the short op cache provides write
* buffering.
*
* There are a limited number (~10) of cache chunks per device so that we don't
* need a very intelligent search.
*/
static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
{
yaffs_Device *dev = obj->myDev;
int i;
yaffs_ChunkCache *cache;
int nCaches = obj->myDev->nShortOpCaches;
for(i = 0; i < nCaches; i++){
cache = &dev->srCache[i];
if (cache->object == obj &&
cache->dirty)
return 1;
}
return 0;
}
static void yaffs_FlushFilesChunkCache(yaffs_Object * obj)
{
yaffs_Device *dev = obj->myDev;
int lowest = -99; /* Stop compiler whining. */
int i;
yaffs_ChunkCache *cache;
int chunkWritten = 0;
int nCaches = obj->myDev->nShortOpCaches;
if (nCaches > 0) {
do {
cache = NULL;
/* Find the dirty cache for this object with the lowest chunk id. */
for (i = 0; i < nCaches; i++) {
if (dev->srCache[i].object == obj &&
dev->srCache[i].dirty) {
if (!cache
|| dev->srCache[i].chunkId <
lowest) {
cache = &dev->srCache[i];
lowest = cache->chunkId;
}
}
}
if (cache && !cache->locked) {
/* Write it out and free it up */
chunkWritten =
yaffs_WriteChunkDataToObject(cache->object,
cache->chunkId,
cache->data,
cache->nBytes,
1);
cache->dirty = 0;
cache->object = NULL;
}
} while (cache && chunkWritten > 0);
if (cache) {
/* Hoosterman, disk full while writing cache out. */
T(YAFFS_TRACE_ERROR,
(TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
}
}
}
/*yaffs_FlushEntireDeviceCache(dev)
*
*
*/
void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
{
yaffs_Object *obj;
int nCaches = dev->nShortOpCaches;
int i;
/* Find a dirty object in the cache and flush it...
* until there are no further dirty objects.
*/
do {
obj = NULL;
for( i = 0; i < nCaches && !obj; i++) {
if (dev->srCache[i].object &&
dev->srCache[i].dirty)
obj = dev->srCache[i].object;
}
if(obj)
yaffs_FlushFilesChunkCache(obj);
} while(obj);
}
/* Grab us a cache chunk for use.
* First look for an empty one.
* Then look for the least recently used non-dirty one.
* Then look for the least recently used dirty one...., flush and look again.
*/
static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device * dev)
{
int i;
int usage;
int theOne;
if (dev->nShortOpCaches > 0) {
for (i = 0; i < dev->nShortOpCaches; i++) {
if (!dev->srCache[i].object)
return &dev->srCache[i];
}
return NULL;
theOne = -1;
usage = 0; /* just to stop the compiler grizzling */
for (i = 0; i < dev->nShortOpCaches; i++) {
if (!dev->srCache[i].dirty &&
((dev->srCache[i].lastUse < usage && theOne >= 0) ||
theOne < 0)) {
usage = dev->srCache[i].lastUse;
theOne = i;
}
}
return theOne >= 0 ? &dev->srCache[theOne] : NULL;
} else {
return NULL;
}
}
static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device * dev)
{
yaffs_ChunkCache *cache;
yaffs_Object *theObj;
int usage;
int i;
int pushout;
if (dev->nShortOpCaches > 0) {
/* Try find a non-dirty one... */
cache = yaffs_GrabChunkCacheWorker(dev);
if (!cache) {
/* They were all dirty, find the last recently used object and flush
* its cache, then find again.
* NB what's here is not very accurate, we actually flush the object
* the last recently used page.
*/
/* With locking we can't assume we can use entry zero */
theObj = NULL;
usage = -1;
cache = NULL;
pushout = -1;
for (i = 0; i < dev->nShortOpCaches; i++) {
if (dev->srCache[i].object &&
!dev->srCache[i].locked &&
(dev->srCache[i].lastUse < usage || !cache))
{
usage = dev->srCache[i].lastUse;
theObj = dev->srCache[i].object;
cache = &dev->srCache[i];
pushout = i;
}
}
if (!cache || cache->dirty) {
/* Flush and try again */
yaffs_FlushFilesChunkCache(theObj);
cache = yaffs_GrabChunkCacheWorker(dev);
}
}
return cache;
} else
return NULL;
}
/* Find a cached chunk */
static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object * obj,
int chunkId)
{
yaffs_Device *dev = obj->myDev;
int i;
if (dev->nShortOpCaches > 0) {
for (i = 0; i < dev->nShortOpCaches; i++) {
if (dev->srCache[i].object == obj &&
dev->srCache[i].chunkId == chunkId) {
dev->cacheHits++;
return &dev->srCache[i];
}
}
}
return NULL;
}
/* Mark the chunk for the least recently used algorithym */
static void yaffs_UseChunkCache(yaffs_Device * dev, yaffs_ChunkCache * cache,
int isAWrite)
{
if (dev->nShortOpCaches > 0) {
if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
/* Reset the cache usages */
int i;
for (i = 1; i < dev->nShortOpCaches; i++) {
dev->srCache[i].lastUse = 0;
}
dev->srLastUse = 0;
}
dev->srLastUse++;
cache->lastUse = dev->srLastUse;
if (isAWrite) {
cache->dirty = 1;
}
}
}
/* Invalidate a single cache page.
* Do this when a whole page gets written,
* ie the short cache for this page is no longer valid.
*/
static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId)
{
if (object->myDev->nShortOpCaches > 0) {
yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
if (cache) {
cache->object = NULL;
}
}
}
/* Invalidate all the cache pages associated with this object
* Do this whenever ther file is deleted or resized.
*/
static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in)
{
int i;
yaffs_Device *dev = in->myDev;
if (dev->nShortOpCaches > 0) {
/* Invalidate it. */
for (i = 0; i < dev->nShortOpCaches; i++) {
if (dev->srCache[i].object == in) {
dev->srCache[i].object = NULL;
}
}
}
}
/*--------------------- Checkpointing --------------------*/
static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev,int head)
{
yaffs_CheckpointValidity cp;
cp.structType = sizeof(cp);
cp.magic = YAFFS_MAGIC;
cp.version = YAFFS_CHECKPOINT_VERSION;
cp.head = (head) ? 1 : 0;
return (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp))?
1 : 0;
}
static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
{
yaffs_CheckpointValidity cp;
int ok;
ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
if(ok)
ok = (cp.structType == sizeof(cp)) &&
(cp.magic == YAFFS_MAGIC) &&
(cp.version == YAFFS_CHECKPOINT_VERSION) &&
(cp.head == ((head) ? 1 : 0));
return ok ? 1 : 0;
}
static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
yaffs_Device *dev)
{
cp->nErasedBlocks = dev->nErasedBlocks;
cp->allocationBlock = dev->allocationBlock;
cp->allocationPage = dev->allocationPage;
cp->nFreeChunks = dev->nFreeChunks;
cp->nDeletedFiles = dev->nDeletedFiles;
cp->nUnlinkedFiles = dev->nUnlinkedFiles;
cp->nBackgroundDeletions = dev->nBackgroundDeletions;
cp->sequenceNumber = dev->sequenceNumber;
cp->oldestDirtySequence = dev->oldestDirtySequence;
}
static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
yaffs_CheckpointDevice *cp)
{
dev->nErasedBlocks = cp->nErasedBlocks;
dev->allocationBlock = cp->allocationBlock;
dev->allocationPage = cp->allocationPage;
dev->nFreeChunks = cp->nFreeChunks;
dev->nDeletedFiles = cp->nDeletedFiles;
dev->nUnlinkedFiles = cp->nUnlinkedFiles;
dev->nBackgroundDeletions = cp->nBackgroundDeletions;
dev->sequenceNumber = cp->sequenceNumber;
dev->oldestDirtySequence = cp->oldestDirtySequence;
}
static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
{
yaffs_CheckpointDevice cp;
__u32 nBytes;
__u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
int ok;
/* Write device runtime values*/
yaffs_DeviceToCheckpointDevice(&cp,dev);
cp.structType = sizeof(cp);
ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
/* Write block info */
if(ok) {
nBytes = nBlocks * sizeof(yaffs_BlockInfo);
ok = (yaffs_CheckpointWrite(dev,dev->blockInfo,nBytes) == nBytes);
}
/* Write chunk bits */
if(ok) {
nBytes = nBlocks * dev->chunkBitmapStride;
ok = (yaffs_CheckpointWrite(dev,dev->chunkBits,nBytes) == nBytes);
}
return ok ? 1 : 0;
}
static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
{
yaffs_CheckpointDevice cp;
__u32 nBytes;
__u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
int ok;
ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
if(!ok)
return 0;
if(cp.structType != sizeof(cp))
return 0;
yaffs_CheckpointDeviceToDevice(dev,&cp);
nBytes = nBlocks * sizeof(yaffs_BlockInfo);
ok = (yaffs_CheckpointRead(dev,dev->blockInfo,nBytes) == nBytes);
if(!ok)
return 0;
nBytes = nBlocks * dev->chunkBitmapStride;
ok = (yaffs_CheckpointRead(dev,dev->chunkBits,nBytes) == nBytes);
return ok ? 1 : 0;
}
static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
yaffs_Object *obj)
{
cp->objectId = obj->objectId;
cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
cp->chunkId = obj->chunkId;
cp->variantType = obj->variantType;
cp->deleted = obj->deleted;
cp->softDeleted = obj->softDeleted;
cp->unlinked = obj->unlinked;
cp->fake = obj->fake;
cp->renameAllowed = obj->renameAllowed;
cp->unlinkAllowed = obj->unlinkAllowed;
cp->serial = obj->serial;
cp->nDataChunks = obj->nDataChunks;
if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
}
static void yaffs_CheckpointObjectToObject( yaffs_Object *obj,yaffs_CheckpointObject *cp)
{
yaffs_Object *parent;
obj->objectId = cp->objectId;
if(cp->parentId)
parent = yaffs_FindOrCreateObjectByNumber(
obj->myDev,
cp->parentId,
YAFFS_OBJECT_TYPE_DIRECTORY);
else
parent = NULL;
if(parent)
yaffs_AddObjectToDirectory(parent, obj);
obj->chunkId = cp->chunkId;
obj->variantType = cp->variantType;
obj->deleted = cp->deleted;
obj->softDeleted = cp->softDeleted;
obj->unlinked = cp->unlinked;
obj->fake = cp->fake;
obj->renameAllowed = cp->renameAllowed;
obj->unlinkAllowed = cp->unlinkAllowed;
obj->serial = cp->serial;
obj->nDataChunks = cp->nDataChunks;
if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
if(obj->objectId >= YAFFS_NOBJECT_BUCKETS)
obj->lazyLoaded = 1;
}
static int yaffs_CheckpointTnodeWorker(yaffs_Object * in, yaffs_Tnode * tn,
__u32 level, int chunkOffset)
{
int i;
yaffs_Device *dev = in->myDev;
int ok = 1;
int nTnodeBytes = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
if (tn) {
if (level > 0) {
for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++){
if (tn->internal[i]) {
ok = yaffs_CheckpointTnodeWorker(in,
tn->internal[i],
level - 1,
(chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
}
}
} else if (level == 0) {
__u32 baseOffset = chunkOffset << YAFFS_TNODES_LEVEL0_BITS;
/* printf("write tnode at %d\n",baseOffset); */
ok = (yaffs_CheckpointWrite(dev,&baseOffset,sizeof(baseOffset)) == sizeof(baseOffset));
if(ok)
ok = (yaffs_CheckpointWrite(dev,tn,nTnodeBytes) == nTnodeBytes);
}
}
return ok;
}
static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
{
__u32 endMarker = ~0;
int ok = 1;
if(obj->variantType == YAFFS_OBJECT_TYPE_FILE){
ok = yaffs_CheckpointTnodeWorker(obj,
obj->variant.fileVariant.top,
obj->variant.fileVariant.topLevel,
0);
if(ok)
ok = (yaffs_CheckpointWrite(obj->myDev,&endMarker,sizeof(endMarker)) ==
sizeof(endMarker));
}
return ok ? 1 : 0;
}
static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
{
__u32 baseChunk;
int ok = 1;
yaffs_Device *dev = obj->myDev;
yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
yaffs_Tnode *tn;
ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
while(ok && (~baseChunk)){
/* Read level 0 tnode */
/* printf("read tnode at %d\n",baseChunk); */
tn = yaffs_GetTnodeRaw(dev);
if(tn)
ok = (yaffs_CheckpointRead(dev,tn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8) ==
(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
else
ok = 0;
if(tn && ok){
ok = yaffs_AddOrFindLevel0Tnode(dev,
fileStructPtr,
baseChunk,
tn) ? 1 : 0;
}
if(ok)
ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
}
return ok ? 1 : 0;
}
static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
{
yaffs_Object *obj;
yaffs_CheckpointObject cp;
int i;
int ok = 1;
struct list_head *lh;
/* Iterate through the objects in each hash entry,
* dumping them to the checkpointing stream.
*/
for(i = 0; ok && i < YAFFS_NOBJECT_BUCKETS; i++){
list_for_each(lh, &dev->objectBucket[i].list) {
if (lh) {
obj = list_entry(lh, yaffs_Object, hashLink);
if (!obj->deferedFree) {
yaffs_ObjectToCheckpointObject(&cp,obj);
cp.structType = sizeof(cp);
/* printf("Write out object %d type %d\n",obj->objectId,obj->variantType); */
ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
if(ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE){
ok = yaffs_WriteCheckpointTnodes(obj);
}
}
}
}
}
/* Dump end of list */
memset(&cp,0xFF,sizeof(yaffs_CheckpointObject));
cp.structType = sizeof(cp);
if(ok)
ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
return ok ? 1 : 0;
}
static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
{
yaffs_Object *obj;
yaffs_CheckpointObject cp;
int ok = 1;
int done = 0;
yaffs_Object *hardList = NULL;
while(ok && !done) {
ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
if(cp.structType != sizeof(cp)) {
/* printf("structure parsing failed\n"); */
ok = 0;
}
if(ok && cp.objectId == ~0)
done = 1;
else if(ok){
T(YAFFS_TRACE_CHECKPOINT,(TSTR("Read object %d parent %d type %d" TENDSTR),
cp.objectId,cp.parentId,cp.variantType));
obj = yaffs_FindOrCreateObjectByNumber(dev,cp.objectId, cp.variantType);
if(obj) {
yaffs_CheckpointObjectToObject(obj,&cp);
if(obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
ok = yaffs_ReadCheckpointTnodes(obj);
} else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
obj->hardLinks.next =
(struct list_head *)
hardList;
hardList = obj;
}
}
}
}
if(ok)
yaffs_HardlinkFixup(dev,hardList);
return ok ? 1 : 0;
}
static int yaffs_WriteCheckpointData(yaffs_Device *dev)
{
int ok;
ok = yaffs_CheckpointOpen(dev,1);
if(ok)
ok = yaffs_WriteCheckpointValidityMarker(dev,1);
if(ok)
ok = yaffs_WriteCheckpointDevice(dev);
if(ok)
ok = yaffs_WriteCheckpointObjects(dev);
if(ok)
ok = yaffs_WriteCheckpointValidityMarker(dev,0);
if(!yaffs_CheckpointClose(dev))
ok = 0;
if(ok)
dev->isCheckpointed = 1;
else
dev->isCheckpointed = 0;
return dev->isCheckpointed;
}
static int yaffs_ReadCheckpointData(yaffs_Device *dev)
{
int ok;
ok = yaffs_CheckpointOpen(dev,0); /* open for read */
if(ok)
ok = yaffs_ReadCheckpointValidityMarker(dev,1);
if(ok)
ok = yaffs_ReadCheckpointDevice(dev);
if(ok)
ok = yaffs_ReadCheckpointObjects(dev);
if(ok)
ok = yaffs_ReadCheckpointValidityMarker(dev,0);
if(!yaffs_CheckpointClose(dev))
ok = 0;
if(ok)
dev->isCheckpointed = 1;
else
dev->isCheckpointed = 0;
return ok ? 1 : 0;
}
static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
{
if(dev->isCheckpointed ||
dev->blocksInCheckpoint > 0){
dev->isCheckpointed = 0;
yaffs_CheckpointInvalidateStream(dev);
if(dev->superBlock && dev->markSuperBlockDirty)
dev->markSuperBlockDirty(dev->superBlock);
}
}
int yaffs_CheckpointSave(yaffs_Device *dev)
{
T(YAFFS_TRACE_CHECKPOINT,(TSTR("save entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
if(!dev->isCheckpointed)
yaffs_WriteCheckpointData(dev);
T(YAFFS_TRACE_CHECKPOINT,(TSTR("save exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
return dev->isCheckpointed;
}
int yaffs_CheckpointRestore(yaffs_Device *dev)
{
int retval;
T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
retval = yaffs_ReadCheckpointData(dev);
T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
return retval;
}
/*--------------------- File read/write ------------------------
* Read and write have very similar structures.
* In general the read/write has three parts to it
* An incomplete chunk to start with (if the read/write is not chunk-aligned)
* Some complete chunks
* An incomplete chunk to end off with
*
* Curve-balls: the first chunk might also be the last chunk.
*/
int yaffs_ReadDataFromFile(yaffs_Object * in, __u8 * buffer, loff_t offset,
int nBytes)
{
int chunk;
int start;
int nToCopy;
int n = nBytes;
int nDone = 0;
yaffs_ChunkCache *cache;
yaffs_Device *dev;
dev = in->myDev;
while (n > 0) {
//chunk = offset / dev->nDataBytesPerChunk + 1;
//start = offset % dev->nDataBytesPerChunk;
yaffs_AddrToChunk(dev,offset,&chunk,&start);
chunk++;
/* OK now check for the curveball where the start and end are in
* the same chunk.
*/
if ((start + n) < dev->nDataBytesPerChunk) {
nToCopy = n;
} else {
nToCopy = dev->nDataBytesPerChunk - start;
}
cache = yaffs_FindChunkCache(in, chunk);
/* If the chunk is already in the cache or it is less than a whole chunk
* then use the cache (if there is caching)
* else bypass the cache.
*/
if (cache || nToCopy != dev->nDataBytesPerChunk) {
if (dev->nShortOpCaches > 0) {
/* If we can't find the data in the cache, then load it up. */
if (!cache) {
cache = yaffs_GrabChunkCache(in->myDev);
cache->object = in;
cache->chunkId = chunk;
cache->dirty = 0;
cache->locked = 0;
yaffs_ReadChunkDataFromObject(in, chunk,
cache->
data);
cache->nBytes = 0;
}
yaffs_UseChunkCache(dev, cache, 0);
cache->locked = 1;
#ifdef CONFIG_YAFFS_WINCE
yfsd_UnlockYAFFS(TRUE);
#endif
memcpy(buffer, &cache->data[start], nToCopy);
#ifdef CONFIG_YAFFS_WINCE
yfsd_LockYAFFS(TRUE);
#endif
cache->locked = 0;
} else {
/* Read into the local buffer then copy..*/
__u8 *localBuffer =
yaffs_GetTempBuffer(dev, __LINE__);
yaffs_ReadChunkDataFromObject(in, chunk,
localBuffer);
#ifdef CONFIG_YAFFS_WINCE
yfsd_UnlockYAFFS(TRUE);
#endif
memcpy(buffer, &localBuffer[start], nToCopy);
#ifdef CONFIG_YAFFS_WINCE
yfsd_LockYAFFS(TRUE);
#endif
yaffs_ReleaseTempBuffer(dev, localBuffer,
__LINE__);
}
} else {
#ifdef CONFIG_YAFFS_WINCE
__u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
/* Under WinCE can't do direct transfer. Need to use a local buffer.
* This is because we otherwise screw up WinCE's memory mapper
*/
yaffs_ReadChunkDataFromObject(in, chunk, localBuffer);
#ifdef CONFIG_YAFFS_WINCE
yfsd_UnlockYAFFS(TRUE);
#endif
memcpy(buffer, localBuffer, dev->nDataBytesPerChunk);
#ifdef CONFIG_YAFFS_WINCE
yfsd_LockYAFFS(TRUE);
yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
#endif
#else
/* A full chunk. Read directly into the supplied buffer. */
yaffs_ReadChunkDataFromObject(in, chunk, buffer);
#endif
}
n -= nToCopy;
offset += nToCopy;
buffer += nToCopy;
nDone += nToCopy;
}
return nDone;
}
int yaffs_WriteDataToFile(yaffs_Object * in, const __u8 * buffer, loff_t offset,
int nBytes, int writeThrough)
{
int chunk;
int start;
int nToCopy;
int n = nBytes;
int nDone = 0;
int nToWriteBack;
int startOfWrite = offset;
int chunkWritten = 0;
int nBytesRead;
yaffs_Device *dev;
dev = in->myDev;
while (n > 0 && chunkWritten >= 0) {
//chunk = offset / dev->nDataBytesPerChunk + 1;
//start = offset % dev->nDataBytesPerChunk;
yaffs_AddrToChunk(dev,offset,&chunk,&start);
chunk++;
/* OK now check for the curveball where the start and end are in
* the same chunk.
*/
if ((start + n) < dev->nDataBytesPerChunk) {
nToCopy = n;
/* Now folks, to calculate how many bytes to write back....
* If we're overwriting and not writing to then end of file then
* we need to write back as much as was there before.
*/
nBytesRead =
in->variant.fileVariant.fileSize -
((chunk - 1) * dev->nDataBytesPerChunk);
if (nBytesRead > dev->nDataBytesPerChunk) {
nBytesRead = dev->nDataBytesPerChunk;
}
nToWriteBack =
(nBytesRead >
(start + n)) ? nBytesRead : (start + n);
} else {
nToCopy = dev->nDataBytesPerChunk - start;
nToWriteBack = dev->nDataBytesPerChunk;
}
if (nToCopy != dev->nDataBytesPerChunk) {
/* An incomplete start or end chunk (or maybe both start and end chunk) */
if (dev->nShortOpCaches > 0) {
yaffs_ChunkCache *cache;
/* If we can't find the data in the cache, then load the cache */
cache = yaffs_FindChunkCache(in, chunk);
if (!cache
&& yaffs_CheckSpaceForAllocation(in->
myDev)) {
cache = yaffs_GrabChunkCache(in->myDev);
cache->object = in;
cache->chunkId = chunk;
cache->dirty = 0;
cache->locked = 0;
yaffs_ReadChunkDataFromObject(in, chunk,
cache->
data);
}
else if(cache &&
!cache->dirty &&
!yaffs_CheckSpaceForAllocation(in->myDev)){
/* Drop the cache if it was a read cache item and
* no space check has been made for it.
*/
cache = NULL;
}
if (cache) {
yaffs_UseChunkCache(dev, cache, 1);
cache->locked = 1;
#ifdef CONFIG_YAFFS_WINCE
yfsd_UnlockYAFFS(TRUE);
#endif
memcpy(&cache->data[start], buffer,
nToCopy);
#ifdef CONFIG_YAFFS_WINCE
yfsd_LockYAFFS(TRUE);
#endif
cache->locked = 0;
cache->nBytes = nToWriteBack;
if (writeThrough) {
chunkWritten =
yaffs_WriteChunkDataToObject
(cache->object,
cache->chunkId,
cache->data, cache->nBytes,
1);
cache->dirty = 0;
}
} else {
chunkWritten = -1; /* fail the write */
}
} else {
/* An incomplete start or end chunk (or maybe both start and end chunk)
* Read into the local buffer then copy, then copy over and write back.
*/
__u8 *localBuffer =
yaffs_GetTempBuffer(dev, __LINE__);
yaffs_ReadChunkDataFromObject(in, chunk,
localBuffer);
#ifdef CONFIG_YAFFS_WINCE
yfsd_UnlockYAFFS(TRUE);
#endif
memcpy(&localBuffer[start], buffer, nToCopy);
#ifdef CONFIG_YAFFS_WINCE
yfsd_LockYAFFS(TRUE);
#endif
chunkWritten =
yaffs_WriteChunkDataToObject(in, chunk,
localBuffer,
nToWriteBack,
0);
yaffs_ReleaseTempBuffer(dev, localBuffer,
__LINE__);
}
} else {
#ifdef CONFIG_YAFFS_WINCE
/* Under WinCE can't do direct transfer. Need to use a local buffer.
* This is because we otherwise screw up WinCE's memory mapper
*/
__u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
#ifdef CONFIG_YAFFS_WINCE
yfsd_UnlockYAFFS(TRUE);
#endif
memcpy(localBuffer, buffer, dev->nDataBytesPerChunk);
#ifdef CONFIG_YAFFS_WINCE
yfsd_LockYAFFS(TRUE);
#endif
chunkWritten =
yaffs_WriteChunkDataToObject(in, chunk, localBuffer,
dev->nDataBytesPerChunk,
0);
yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
#else
/* A full chunk. Write directly from the supplied buffer. */
chunkWritten =
yaffs_WriteChunkDataToObject(in, chunk, buffer,
dev->nDataBytesPerChunk,
0);
#endif
/* Since we've overwritten the cached data, we better invalidate it. */
yaffs_InvalidateChunkCache(in, chunk);
}
if (chunkWritten >= 0) {
n -= nToCopy;
offset += nToCopy;
buffer += nToCopy;
nDone += nToCopy;
}
}
/* Update file object */
if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize) {
in->variant.fileVariant.fileSize = (startOfWrite + nDone);
}
in->dirty = 1;
return nDone;
}
/* ---------------------- File resizing stuff ------------------ */
static void yaffs_PruneResizedChunks(yaffs_Object * in, int newSize)
{
yaffs_Device *dev = in->myDev;
int oldFileSize = in->variant.fileVariant.fileSize;
int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
dev->nDataBytesPerChunk;
int i;
int chunkId;
/* Delete backwards so that we don't end up with holes if
* power is lost part-way through the operation.
*/
for (i = lastDel; i >= startDel; i--) {
/* NB this could be optimised somewhat,
* eg. could retrieve the tags and write them without
* using yaffs_DeleteChunk
*/
chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
if (chunkId > 0) {
if (chunkId <
(dev->internalStartBlock * dev->nChunksPerBlock)
|| chunkId >=
((dev->internalEndBlock +
1) * dev->nChunksPerBlock)) {
T(YAFFS_TRACE_ALWAYS,
(TSTR("Found daft chunkId %d for %d" TENDSTR),
chunkId, i));
} else {
in->nDataChunks--;
yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
}
}
}
}
int yaffs_ResizeFile(yaffs_Object * in, loff_t newSize)
{
int oldFileSize = in->variant.fileVariant.fileSize;
int newSizeOfPartialChunk;
int newFullChunks;
yaffs_Device *dev = in->myDev;
yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
yaffs_FlushFilesChunkCache(in);
yaffs_InvalidateWholeChunkCache(in);
yaffs_CheckGarbageCollection(dev);
if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
return yaffs_GetFileSize(in);
}
if (newSize == oldFileSize) {
return oldFileSize;
}
if (newSize < oldFileSize) {
yaffs_PruneResizedChunks(in, newSize);
if (newSizeOfPartialChunk != 0) {
int lastChunk = 1 + newFullChunks;
__u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
/* Got to read and rewrite the last chunk with its new size and zero pad */
yaffs_ReadChunkDataFromObject(in, lastChunk,
localBuffer);
memset(localBuffer + newSizeOfPartialChunk, 0,
dev->nDataBytesPerChunk - newSizeOfPartialChunk);
yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
newSizeOfPartialChunk, 1);
yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
}
in->variant.fileVariant.fileSize = newSize;
yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
}
/* Write a new object header.
* show we've shrunk the file, if need be
* Do this only if the file is not in the deleted directories.
*/
if (in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
in->parent->objectId != YAFFS_OBJECTID_DELETED) {
yaffs_UpdateObjectHeader(in, NULL, 0,
(newSize < oldFileSize) ? 1 : 0, 0);
}
return newSize;
}
loff_t yaffs_GetFileSize(yaffs_Object * obj)
{
obj = yaffs_GetEquivalentObject(obj);
switch (obj->variantType) {
case YAFFS_OBJECT_TYPE_FILE:
return obj->variant.fileVariant.fileSize;
case YAFFS_OBJECT_TYPE_SYMLINK:
return yaffs_strlen(obj->variant.symLinkVariant.alias);
default:
return 0;
}
}
int yaffs_FlushFile(yaffs_Object * in, int updateTime)
{
int retVal;
if (in->dirty) {
yaffs_FlushFilesChunkCache(in);
if (updateTime) {
#ifdef CONFIG_YAFFS_WINCE
yfsd_WinFileTimeNow(in->win_mtime);
#else
in->yst_mtime = Y_CURRENT_TIME;
#endif
}
retVal =
(yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
0) ? YAFFS_OK : YAFFS_FAIL;
} else {
retVal = YAFFS_OK;
}
return retVal;
}
static int yaffs_DoGenericObjectDeletion(yaffs_Object * in)
{
/* First off, invalidate the file's data in the cache, without flushing. */
yaffs_InvalidateWholeChunkCache(in);
if (in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir)) {
/* Move to the unlinked directory so we have a record that it was deleted. */
yaffs_ChangeObjectName(in, in->myDev->deletedDir, NULL, 0, 0);
}
yaffs_RemoveObjectFromDirectory(in);
yaffs_DeleteChunk(in->myDev, in->chunkId, 1, __LINE__);
in->chunkId = -1;
yaffs_FreeObject(in);
return YAFFS_OK;
}
/* yaffs_DeleteFile deletes the whole file data
* and the inode associated with the file.
* It does not delete the links associated with the file.
*/
static int yaffs_UnlinkFile(yaffs_Object * in)
{
int retVal;
int immediateDeletion = 0;
if (1) {
#ifdef __KERNEL__
if (!in->myInode) {
immediateDeletion = 1;
}
#else
if (in->inUse <= 0) {
immediateDeletion = 1;
}
#endif
if (immediateDeletion) {
retVal =
yaffs_ChangeObjectName(in, in->myDev->deletedDir,
NULL, 0, 0);
T(YAFFS_TRACE_TRACING,
(TSTR("yaffs: immediate deletion of file %d" TENDSTR),
in->objectId));
in->deleted = 1;
in->myDev->nDeletedFiles++;
if (0 && in->myDev->isYaffs2) {
yaffs_ResizeFile(in, 0);
}
yaffs_SoftDeleteFile(in);
} else {
retVal =
yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
NULL, 0, 0);
}
}
return retVal;
}
int yaffs_DeleteFile(yaffs_Object * in)
{
int retVal = YAFFS_OK;
if (in->nDataChunks > 0) {
/* Use soft deletion if there is data in the file */
if (!in->unlinked) {
retVal = yaffs_UnlinkFile(in);
}
if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
in->deleted = 1;
in->myDev->nDeletedFiles++;
yaffs_SoftDeleteFile(in);
}
return in->deleted ? YAFFS_OK : YAFFS_FAIL;
} else {
/* The file has no data chunks so we toss it immediately */
yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
in->variant.fileVariant.top = NULL;
yaffs_DoGenericObjectDeletion(in);
return YAFFS_OK;
}
}
static int yaffs_DeleteDirectory(yaffs_Object * in)
{
/* First check that the directory is empty. */
if (list_empty(&in->variant.directoryVariant.children)) {
return yaffs_DoGenericObjectDeletion(in);
}
return YAFFS_FAIL;
}
static int yaffs_DeleteSymLink(yaffs_Object * in)
{
YFREE(in->variant.symLinkVariant.alias);
return yaffs_DoGenericObjectDeletion(in);
}
static int yaffs_DeleteHardLink(yaffs_Object * in)
{
/* remove this hardlink from the list assocaited with the equivalent
* object
*/
list_del(&in->hardLinks);
return yaffs_DoGenericObjectDeletion(in);
}
static void yaffs_DestroyObject(yaffs_Object * obj)
{
switch (obj->variantType) {
case YAFFS_OBJECT_TYPE_FILE:
yaffs_DeleteFile(obj);
break;
case YAFFS_OBJECT_TYPE_DIRECTORY:
yaffs_DeleteDirectory(obj);
break;
case YAFFS_OBJECT_TYPE_SYMLINK:
yaffs_DeleteSymLink(obj);
break;
case YAFFS_OBJECT_TYPE_HARDLINK:
yaffs_DeleteHardLink(obj);
break;
case YAFFS_OBJECT_TYPE_SPECIAL:
yaffs_DoGenericObjectDeletion(obj);
break;
case YAFFS_OBJECT_TYPE_UNKNOWN:
break; /* should not happen. */
}
}
static int yaffs_UnlinkWorker(yaffs_Object * obj)
{
if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
return yaffs_DeleteHardLink(obj);
} else if (!list_empty(&obj->hardLinks)) {
/* Curve ball: We're unlinking an object that has a hardlink.
*
* This problem arises because we are not strictly following
* The Linux link/inode model.
*
* We can't really delete the object.
* Instead, we do the following:
* - Select a hardlink.
* - Unhook it from the hard links
* - Unhook it from its parent directory (so that the rename can work)
* - Rename the object to the hardlink's name.
* - Delete the hardlink
*/
yaffs_Object *hl;
int retVal;
YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
hl = list_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
list_del_init(&hl->hardLinks);
list_del_init(&hl->siblings);
yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
retVal = yaffs_ChangeObjectName(obj, hl->parent, name, 0, 0);
if (retVal == YAFFS_OK) {
retVal = yaffs_DoGenericObjectDeletion(hl);
}
return retVal;
} else {
switch (obj->variantType) {
case YAFFS_OBJECT_TYPE_FILE:
return yaffs_UnlinkFile(obj);
break;
case YAFFS_OBJECT_TYPE_DIRECTORY:
return yaffs_DeleteDirectory(obj);
break;
case YAFFS_OBJECT_TYPE_SYMLINK:
return yaffs_DeleteSymLink(obj);
break;
case YAFFS_OBJECT_TYPE_SPECIAL:
return yaffs_DoGenericObjectDeletion(obj);
break;
case YAFFS_OBJECT_TYPE_HARDLINK:
case YAFFS_OBJECT_TYPE_UNKNOWN:
default:
return YAFFS_FAIL;
}
}
}
static int yaffs_UnlinkObject( yaffs_Object *obj)
{
if (obj && obj->unlinkAllowed) {
return yaffs_UnlinkWorker(obj);
}
return YAFFS_FAIL;
}
int yaffs_Unlink(yaffs_Object * dir, const YCHAR * name)
{
yaffs_Object *obj;
obj = yaffs_FindObjectByName(dir, name);
return yaffs_UnlinkObject(obj);
}
/*----------------------- Initialisation Scanning ---------------------- */
static void yaffs_HandleShadowedObject(yaffs_Device * dev, int objId,
int backwardScanning)
{
yaffs_Object *obj;
if (!backwardScanning) {
/* Handle YAFFS1 forward scanning case
* For YAFFS1 we always do the deletion
*/
} else {
/* Handle YAFFS2 case (backward scanning)
* If the shadowed object exists then ignore.
*/
if (yaffs_FindObjectByNumber(dev, objId)) {
return;
}
}
/* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
* We put it in unlinked dir to be cleaned up after the scanning
*/
obj =
yaffs_FindOrCreateObjectByNumber(dev, objId,
YAFFS_OBJECT_TYPE_FILE);
yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
obj->variant.fileVariant.shrinkSize = 0;
obj->valid = 1; /* So that we don't read any other info for this file */
}
typedef struct {
int seq;
int block;
} yaffs_BlockIndex;
static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
{
yaffs_Object *hl;
yaffs_Object *in;
while (hardList) {
hl = hardList;
hardList = (yaffs_Object *) (hardList->hardLinks.next);
in = yaffs_FindObjectByNumber(dev,
hl->variant.hardLinkVariant.
equivalentObjectId);
if (in) {
/* Add the hardlink pointers */
hl->variant.hardLinkVariant.equivalentObject = in;
list_add(&hl->hardLinks, &in->hardLinks);
} else {
/* Todo Need to report/handle this better.
* Got a problem... hardlink to a non-existant object
*/
hl->variant.hardLinkVariant.equivalentObject = NULL;
INIT_LIST_HEAD(&hl->hardLinks);
}
}
}
static int ybicmp(const void *a, const void *b){
register int aseq = ((yaffs_BlockIndex *)a)->seq;
register int bseq = ((yaffs_BlockIndex *)b)->seq;
register int ablock = ((yaffs_BlockIndex *)a)->block;
register int bblock = ((yaffs_BlockIndex *)b)->block;
if( aseq == bseq )
return ablock - bblock;
else
return aseq - bseq;
}
static int yaffs_Scan(yaffs_Device * dev)
{
yaffs_ExtendedTags tags;
int blk;
int blockIterator;
int startIterator;
int endIterator;
int nBlocksToScan = 0;
int result;
int chunk;
int c;
int deleted;
yaffs_BlockState state;
yaffs_Object *hardList = NULL;
yaffs_Object *hl;
yaffs_BlockInfo *bi;
int sequenceNumber;
yaffs_ObjectHeader *oh;
yaffs_Object *in;
yaffs_Object *parent;
int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
__u8 *chunkData;
yaffs_BlockIndex *blockIndex = NULL;
if (dev->isYaffs2) {
T(YAFFS_TRACE_SCAN,
(TSTR("yaffs_Scan is not for YAFFS2!" TENDSTR)));
return YAFFS_FAIL;
}
//TODO Throw all the yaffs2 stuuf out of yaffs_Scan since it is only for yaffs1 format.
T(YAFFS_TRACE_SCAN,
(TSTR("yaffs_Scan starts intstartblk %d intendblk %d..." TENDSTR),
dev->internalStartBlock, dev->internalEndBlock));
chunkData = yaffs_GetTempBuffer(dev, __LINE__);
dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
if (dev->isYaffs2) {
blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
}
/* Scan all the blocks to determine their state */
for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
bi = yaffs_GetBlockInfo(dev, blk);
yaffs_ClearChunkBits(dev, blk);
bi->pagesInUse = 0;
bi->softDeletions = 0;
yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
bi->blockState = state;
bi->sequenceNumber = sequenceNumber;
T(YAFFS_TRACE_SCAN_DEBUG,
(TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
state, sequenceNumber));
if (state == YAFFS_BLOCK_STATE_DEAD) {
T(YAFFS_TRACE_BAD_BLOCKS,
(TSTR("block %d is bad" TENDSTR), blk));
} else if (state == YAFFS_BLOCK_STATE_EMPTY) {
T(YAFFS_TRACE_SCAN_DEBUG,
(TSTR("Block empty " TENDSTR)));
dev->nErasedBlocks++;
dev->nFreeChunks += dev->nChunksPerBlock;
} else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
/* Determine the highest sequence number */
if (dev->isYaffs2 &&
sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
blockIndex[nBlocksToScan].seq = sequenceNumber;
blockIndex[nBlocksToScan].block = blk;
nBlocksToScan++;
if (sequenceNumber >= dev->sequenceNumber) {
dev->sequenceNumber = sequenceNumber;
}
} else if (dev->isYaffs2) {
/* TODO: Nasty sequence number! */
T(YAFFS_TRACE_SCAN,
(TSTR
("Block scanning block %d has bad sequence number %d"
TENDSTR), blk, sequenceNumber));
}
}
}
/* Sort the blocks
* Dungy old bubble sort for now...
*/
if (dev->isYaffs2) {
yaffs_BlockIndex temp;
int i;
int j;
for (i = 0; i < nBlocksToScan; i++)
for (j = i + 1; j < nBlocksToScan; j++)
if (blockIndex[i].seq > blockIndex[j].seq) {
temp = blockIndex[j];
blockIndex[j] = blockIndex[i];
blockIndex[i] = temp;
}
}
/* Now scan the blocks looking at the data. */
if (dev->isYaffs2) {
startIterator = 0;
endIterator = nBlocksToScan - 1;
T(YAFFS_TRACE_SCAN_DEBUG,
(TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
} else {
startIterator = dev->internalStartBlock;
endIterator = dev->internalEndBlock;
}
/* For each block.... */
for (blockIterator = startIterator; blockIterator <= endIterator;
blockIterator++) {
if (dev->isYaffs2) {
/* get the block to scan in the correct order */
blk = blockIndex[blockIterator].block;
} else {
blk = blockIterator;
}
bi = yaffs_GetBlockInfo(dev, blk);
state = bi->blockState;
deleted = 0;
/* For each chunk in each block that needs scanning....*/
for (c = 0; c < dev->nChunksPerBlock &&
state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
/* Read the tags and decide what to do */
chunk = blk * dev->nChunksPerBlock + c;
result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
&tags);
/* Let's have a good look at this chunk... */
if (!dev->isYaffs2 && tags.chunkDeleted) {
/* YAFFS1 only...
* A deleted chunk
*/
deleted++;
dev->nFreeChunks++;
/*T((" %d %d deleted\n",blk,c)); */
} else if (!tags.chunkUsed) {
/* An unassigned chunk in the block
* This means that either the block is empty or
* this is the one being allocated from
*/
if (c == 0) {
/* We're looking at the first chunk in the block so the block is unused */
state = YAFFS_BLOCK_STATE_EMPTY;
dev->nErasedBlocks++;
} else {
/* this is the block being allocated from */
T(YAFFS_TRACE_SCAN,
(TSTR
(" Allocating from %d %d" TENDSTR),
blk, c));
state = YAFFS_BLOCK_STATE_ALLOCATING;
dev->allocationBlock = blk;
dev->allocationPage = c;
dev->allocationBlockFinder = blk;
/* Set it to here to encourage the allocator to go forth from here. */
/* Yaffs2 sanity check:
* This should be the one with the highest sequence number
*/
if (dev->isYaffs2
&& (dev->sequenceNumber !=
bi->sequenceNumber)) {
T(YAFFS_TRACE_ALWAYS,
(TSTR
("yaffs: Allocation block %d was not highest sequence id:"
" block seq = %d, dev seq = %d"
TENDSTR), blk,bi->sequenceNumber,dev->sequenceNumber));
}
}
dev->nFreeChunks += (dev->nChunksPerBlock - c);
} else if (tags.chunkId > 0) {
/* chunkId > 0 so it is a data chunk... */
unsigned int endpos;
yaffs_SetChunkBit(dev, blk, c);
bi->pagesInUse++;
in = yaffs_FindOrCreateObjectByNumber(dev,
tags.
objectId,
YAFFS_OBJECT_TYPE_FILE);
/* PutChunkIntoFile checks for a clash (two data chunks with
* the same chunkId).
*/
yaffs_PutChunkIntoFile(in, tags.chunkId, chunk,
1);
endpos =
(tags.chunkId - 1) * dev->nDataBytesPerChunk +
tags.byteCount;
if (in->variantType == YAFFS_OBJECT_TYPE_FILE
&& in->variant.fileVariant.scannedFileSize <
endpos) {
in->variant.fileVariant.
scannedFileSize = endpos;
if (!dev->useHeaderFileSize) {
in->variant.fileVariant.
fileSize =
in->variant.fileVariant.
scannedFileSize;
}
}
/* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId)); */
} else {
/* chunkId == 0, so it is an ObjectHeader.
* Thus, we read in the object header and make the object
*/
yaffs_SetChunkBit(dev, blk, c);
bi->pagesInUse++;
result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
chunkData,
NULL);
oh = (yaffs_ObjectHeader *) chunkData;
in = yaffs_FindObjectByNumber(dev,
tags.objectId);
if (in && in->variantType != oh->type) {
/* This should not happen, but somehow
* Wev'e ended up with an objectId that has been reused but not yet
* deleted, and worse still it has changed type. Delete the old object.
*/
yaffs_DestroyObject(in);
in = 0;
}
in = yaffs_FindOrCreateObjectByNumber(dev,
tags.
objectId,
oh->type);
if (oh->shadowsObject > 0) {
yaffs_HandleShadowedObject(dev,
oh->
shadowsObject,
0);
}
if (in->valid) {
/* We have already filled this one. We have a duplicate and need to resolve it. */
unsigned existingSerial = in->serial;
unsigned newSerial = tags.serialNumber;
if (dev->isYaffs2 ||
((existingSerial + 1) & 3) ==
newSerial) {
/* Use new one - destroy the exisiting one */
yaffs_DeleteChunk(dev,
in->chunkId,
1, __LINE__);
in->valid = 0;
} else {
/* Use existing - destroy this one. */
yaffs_DeleteChunk(dev, chunk, 1,
__LINE__);
}
}
if (!in->valid &&
(tags.objectId == YAFFS_OBJECTID_ROOT ||
tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
/* We only load some info, don't fiddle with directory structure */
in->valid = 1;
in->variantType = oh->type;
in->yst_mode = oh->yst_mode;
#ifdef CONFIG_YAFFS_WINCE
in->win_atime[0] = oh->win_atime[0];
in->win_ctime[0] = oh->win_ctime[0];
in->win_mtime[0] = oh->win_mtime[0];
in->win_atime[1] = oh->win_atime[1];
in->win_ctime[1] = oh->win_ctime[1];
in->win_mtime[1] = oh->win_mtime[1];
#else
in->yst_uid = oh->yst_uid;
in->yst_gid = oh->yst_gid;
in->yst_atime = oh->yst_atime;
in->yst_mtime = oh->yst_mtime;
in->yst_ctime = oh->yst_ctime;
in->yst_rdev = oh->yst_rdev;
#endif
in->chunkId = chunk;
} else if (!in->valid) {
/* we need to load this info */
in->valid = 1;
in->variantType = oh->type;
in->yst_mode = oh->yst_mode;
#ifdef CONFIG_YAFFS_WINCE
in->win_atime[0] = oh->win_atime[0];
in->win_ctime[0] = oh->win_ctime[0];
in->win_mtime[0] = oh->win_mtime[0];
in->win_atime[1] = oh->win_atime[1];
in->win_ctime[1] = oh->win_ctime[1];
in->win_mtime[1] = oh->win_mtime[1];
#else
in->yst_uid = oh->yst_uid;
in->yst_gid = oh->yst_gid;
in->yst_atime = oh->yst_atime;
in->yst_mtime = oh->yst_mtime;
in->yst_ctime = oh->yst_ctime;
in->yst_rdev = oh->yst_rdev;
#endif
in->chunkId = chunk;
yaffs_SetObjectName(in, oh->name);
in->dirty = 0;
/* directory stuff...
* hook up to parent
*/
parent =
yaffs_FindOrCreateObjectByNumber
(dev, oh->parentObjectId,
YAFFS_OBJECT_TYPE_DIRECTORY);
if (parent->variantType ==
YAFFS_OBJECT_TYPE_UNKNOWN) {
/* Set up as a directory */
parent->variantType =
YAFFS_OBJECT_TYPE_DIRECTORY;
INIT_LIST_HEAD(&parent->variant.
directoryVariant.
children);
} else if (parent->variantType !=
YAFFS_OBJECT_TYPE_DIRECTORY)
{
/* Hoosterman, another problem....
* We're trying to use a non-directory as a directory
*/
T(YAFFS_TRACE_ERROR,
(TSTR
("yaffs tragedy: attempting to use non-directory as"
" a directory in scan. Put in lost+found."
TENDSTR)));
parent = dev->lostNFoundDir;
}
yaffs_AddObjectToDirectory(parent, in);
if (0 && (parent == dev->deletedDir ||
parent == dev->unlinkedDir)) {
in->deleted = 1; /* If it is unlinked at start up then it wants deleting */
dev->nDeletedFiles++;
}
/* Note re hardlinks.
* Since we might scan a hardlink before its equivalent object is scanned
* we put them all in a list.
* After scanning is complete, we should have all the objects, so we run through this
* list and fix up all the chains.
*/
switch (in->variantType) {
case YAFFS_OBJECT_TYPE_UNKNOWN:
/* Todo got a problem */
break;
case YAFFS_OBJECT_TYPE_FILE:
if (dev->isYaffs2
&& oh->isShrink) {
/* Prune back the shrunken chunks */
yaffs_PruneResizedChunks
(in, oh->fileSize);
/* Mark the block as having a shrinkHeader */
bi->hasShrinkHeader = 1;
}
if (dev->useHeaderFileSize)
in->variant.fileVariant.
fileSize =
oh->fileSize;
break;
case YAFFS_OBJECT_TYPE_HARDLINK:
in->variant.hardLinkVariant.
equivalentObjectId =
oh->equivalentObjectId;
in->hardLinks.next =
(struct list_head *)
hardList;
hardList = in;
break;
case YAFFS_OBJECT_TYPE_DIRECTORY:
/* Do nothing */
break;
case YAFFS_OBJECT_TYPE_SPECIAL:
/* Do nothing */
break;
case YAFFS_OBJECT_TYPE_SYMLINK:
in->variant.symLinkVariant.
alias =
yaffs_CloneString(oh->alias);
break;
}
if (parent == dev->deletedDir) {
yaffs_DestroyObject(in);
bi->hasShrinkHeader = 1;
}
}
}
}
if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
/* If we got this far while scanning, then the block is fully allocated.*/
state = YAFFS_BLOCK_STATE_FULL;
}
bi->blockState = state;
/* Now let's see if it was dirty */
if (bi->pagesInUse == 0 &&
!bi->hasShrinkHeader &&
bi->blockState == YAFFS_BLOCK_STATE_FULL) {
yaffs_BlockBecameDirty(dev, blk);
}
}
if (blockIndex) {
YFREE(blockIndex);
}
/* Ok, we've done all the scanning.
* Fix up the hard link chains.
* We should now have scanned all the objects, now it's time to add these
* hardlinks.
*/
yaffs_HardlinkFixup(dev,hardList);
/* Handle the unlinked files. Since they were left in an unlinked state we should
* just delete them.
*/
{
struct list_head *i;
struct list_head *n;
yaffs_Object *l;
/* Soft delete all the unlinked files */
list_for_each_safe(i, n,
&dev->unlinkedDir->variant.directoryVariant.
children) {
if (i) {
l = list_entry(i, yaffs_Object, siblings);
yaffs_DestroyObject(l);
}
}
}
yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
return YAFFS_OK;
}
static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
{
__u8 *chunkData;
yaffs_ObjectHeader *oh;
yaffs_Device *dev = in->myDev;
yaffs_ExtendedTags tags;
int result;
if(in->lazyLoaded){
in->lazyLoaded = 0;
chunkData = yaffs_GetTempBuffer(dev, __LINE__);
result = yaffs_ReadChunkWithTagsFromNAND(dev,in->chunkId,chunkData,&tags);
oh = (yaffs_ObjectHeader *) chunkData;
in->yst_mode = oh->yst_mode;
#ifdef CONFIG_YAFFS_WINCE
in->win_atime[0] = oh->win_atime[0];
in->win_ctime[0] = oh->win_ctime[0];
in->win_mtime[0] = oh->win_mtime[0];
in->win_atime[1] = oh->win_atime[1];
in->win_ctime[1] = oh->win_ctime[1];
in->win_mtime[1] = oh->win_mtime[1];
#else
in->yst_uid = oh->yst_uid;
in->yst_gid = oh->yst_gid;
in->yst_atime = oh->yst_atime;
in->yst_mtime = oh->yst_mtime;
in->yst_ctime = oh->yst_ctime;
in->yst_rdev = oh->yst_rdev;
#endif
yaffs_SetObjectName(in, oh->name);
if(in->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
in->variant.symLinkVariant.alias =
yaffs_CloneString(oh->alias);
yaffs_ReleaseTempBuffer(dev,chunkData, __LINE__);
}
}
static int yaffs_ScanBackwards(yaffs_Device * dev)
{
yaffs_ExtendedTags tags;
int blk;
int blockIterator;
int startIterator;
int endIterator;
int nBlocksToScan = 0;
int chunk;
int result;
int c;
int deleted;
yaffs_BlockState state;
yaffs_Object *hardList = NULL;
yaffs_BlockInfo *bi;
int sequenceNumber;
yaffs_ObjectHeader *oh;
yaffs_Object *in;
yaffs_Object *parent;
int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
int itsUnlinked;
__u8 *chunkData;
int fileSize;
int isShrink;
int foundChunksInBlock;
int equivalentObjectId;
yaffs_BlockIndex *blockIndex = NULL;
int altBlockIndex = 0;
if (!dev->isYaffs2) {
T(YAFFS_TRACE_SCAN,
(TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
return YAFFS_FAIL;
}
T(YAFFS_TRACE_SCAN,
(TSTR
("yaffs_ScanBackwards starts intstartblk %d intendblk %d..."
TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
if(!blockIndex) {
blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
altBlockIndex = 1;
}
if(!blockIndex) {
T(YAFFS_TRACE_SCAN,
(TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
return YAFFS_FAIL;
}
chunkData = yaffs_GetTempBuffer(dev, __LINE__);
/* Scan all the blocks to determine their state */
for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
bi = yaffs_GetBlockInfo(dev, blk);
yaffs_ClearChunkBits(dev, blk);
bi->pagesInUse = 0;
bi->softDeletions = 0;
yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
bi->blockState = state;
bi->sequenceNumber = sequenceNumber;
if(bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
T(YAFFS_TRACE_SCAN_DEBUG,
(TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
state, sequenceNumber));
if(state == YAFFS_BLOCK_STATE_CHECKPOINT){
/* todo .. fix free space ? */
} else if (state == YAFFS_BLOCK_STATE_DEAD) {
T(YAFFS_TRACE_BAD_BLOCKS,
(TSTR("block %d is bad" TENDSTR), blk));
} else if (state == YAFFS_BLOCK_STATE_EMPTY) {
T(YAFFS_TRACE_SCAN_DEBUG,
(TSTR("Block empty " TENDSTR)));
dev->nErasedBlocks++;
dev->nFreeChunks += dev->nChunksPerBlock;
} else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
/* Determine the highest sequence number */
if (dev->isYaffs2 &&
sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
blockIndex[nBlocksToScan].seq = sequenceNumber;
blockIndex[nBlocksToScan].block = blk;
nBlocksToScan++;
if (sequenceNumber >= dev->sequenceNumber) {
dev->sequenceNumber = sequenceNumber;
}
} else if (dev->isYaffs2) {
/* TODO: Nasty sequence number! */
T(YAFFS_TRACE_SCAN,
(TSTR
("Block scanning block %d has bad sequence number %d"
TENDSTR), blk, sequenceNumber));
}
}
}
T(YAFFS_TRACE_SCAN,
(TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
YYIELD();
/* Sort the blocks */
#ifndef CONFIG_YAFFS_USE_OWN_SORT
{
/* Use qsort now. */
qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), ybicmp);
}
#else
{
/* Dungy old bubble sort... */
yaffs_BlockIndex temp;
int i;
int j;
for (i = 0; i < nBlocksToScan; i++)
for (j = i + 1; j < nBlocksToScan; j++)
if (blockIndex[i].seq > blockIndex[j].seq) {
temp = blockIndex[j];
blockIndex[j] = blockIndex[i];
blockIndex[i] = temp;
}
}
#endif
YYIELD();
T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
/* Now scan the blocks looking at the data. */
startIterator = 0;
endIterator = nBlocksToScan - 1;
T(YAFFS_TRACE_SCAN_DEBUG,
(TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
/* For each block.... backwards */
for (blockIterator = endIterator; blockIterator >= startIterator;
blockIterator--) {
/* Cooperative multitasking! This loop can run for so
long that watchdog timers expire. */
YYIELD();
/* get the block to scan in the correct order */
blk = blockIndex[blockIterator].block;
bi = yaffs_GetBlockInfo(dev, blk);
state = bi->blockState;
deleted = 0;
/* For each chunk in each block that needs scanning.... */
foundChunksInBlock = 0;
for (c = dev->nChunksPerBlock - 1; c >= 0 &&
(state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
/* Scan backwards...
* Read the tags and decide what to do
*/
chunk = blk * dev->nChunksPerBlock + c;
result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
&tags);
/* Let's have a good look at this chunk... */
if (!tags.chunkUsed) {
/* An unassigned chunk in the block.
* If there are used chunks after this one, then
* it is a chunk that was skipped due to failing the erased
* check. Just skip it so that it can be deleted.
* But, more typically, We get here when this is an unallocated
* chunk and his means that either the block is empty or
* this is the one being allocated from
*/
if(foundChunksInBlock)
{
/* This is a chunk that was skipped due to failing the erased check */
} else if (c == 0) {
/* We're looking at the first chunk in the block so the block is unused */
state = YAFFS_BLOCK_STATE_EMPTY;
dev->nErasedBlocks++;
} else {
/* this is the block being allocated from */
if (state ==
YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
T(YAFFS_TRACE_SCAN,
(TSTR
(" Allocating from %d %d"
TENDSTR), blk, c));
}
state = YAFFS_BLOCK_STATE_ALLOCATING;
dev->allocationBlock = blk;
dev->allocationPage = c;
dev->allocationBlockFinder = blk;
/* Set it to here to encourage the allocator to
* go forth from here.
*/
/* Yaffs2 sanity check:
* This should be the one with the highest sequence number
*/
if (dev->isYaffs2
&& (dev->sequenceNumber !=
bi->sequenceNumber)) {
T(YAFFS_TRACE_ALWAYS,
(TSTR
("yaffs: Allocation block %d was not highest sequence "
"id: block seq = %d, dev seq = %d"
TENDSTR), blk,
bi->sequenceNumber,
dev->sequenceNumber));
}
}
dev->nFreeChunks++;
} else if (tags.chunkId > 0) {
/* chunkId > 0 so it is a data chunk... */
unsigned int endpos;
__u32 chunkBase =
(tags.chunkId - 1) * dev->nDataBytesPerChunk;
foundChunksInBlock = 1;
yaffs_SetChunkBit(dev, blk, c);
bi->pagesInUse++;
in = yaffs_FindOrCreateObjectByNumber(dev,
tags.
objectId,
YAFFS_OBJECT_TYPE_FILE);
if (in->variantType == YAFFS_OBJECT_TYPE_FILE
&& chunkBase <
in->variant.fileVariant.shrinkSize) {
/* This has not been invalidated by a resize */
yaffs_PutChunkIntoFile(in, tags.chunkId,
chunk, -1);
/* File size is calculated by looking at the data chunks if we have not
* seen an object header yet. Stop this practice once we find an object header.
*/
endpos =
(tags.chunkId -
1) * dev->nDataBytesPerChunk +
tags.byteCount;
if (!in->valid && /* have not got an object header yet */
in->variant.fileVariant.
scannedFileSize < endpos) {
in->variant.fileVariant.
scannedFileSize = endpos;
in->variant.fileVariant.
fileSize =
in->variant.fileVariant.
scannedFileSize;
}
} else {
/* This chunk has been invalidated by a resize, so delete */
yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
}
} else {
/* chunkId == 0, so it is an ObjectHeader.
* Thus, we read in the object header and make the object
*/
foundChunksInBlock = 1;
yaffs_SetChunkBit(dev, blk, c);
bi->pagesInUse++;
oh = NULL;
in = NULL;
if (tags.extraHeaderInfoAvailable) {
in = yaffs_FindOrCreateObjectByNumber
(dev, tags.objectId,
tags.extraObjectType);
}
if (!in ||
#ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
!in->valid ||
#endif
tags.extraShadows ||
(!in->valid &&
(tags.objectId == YAFFS_OBJECTID_ROOT ||
tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))
) {
/* If we don't have valid info then we need to read the chunk
* TODO In future we can probably defer reading the chunk and
* living with invalid data until needed.
*/
result = yaffs_ReadChunkWithTagsFromNAND(dev,
chunk,
chunkData,
NULL);
oh = (yaffs_ObjectHeader *) chunkData;
if (!in)
in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
}
if (!in) {
/* TODO Hoosterman we have a problem! */
T(YAFFS_TRACE_ERROR,
(TSTR
("yaffs tragedy: Could not make object for object %d "
"at chunk %d during scan"
TENDSTR), tags.objectId, chunk));
}
if (in->valid) {
/* We have already filled this one.
* We have a duplicate that will be discarded, but
* we first have to suck out resize info if it is a file.
*/
if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
((oh &&
oh-> type == YAFFS_OBJECT_TYPE_FILE)||
(tags.extraHeaderInfoAvailable &&
tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))
) {
__u32 thisSize =
(oh) ? oh->fileSize : tags.
extraFileLength;
__u32 parentObjectId =
(oh) ? oh->
parentObjectId : tags.
extraParentObjectId;
unsigned isShrink =
(oh) ? oh->isShrink : tags.
extraIsShrinkHeader;
/* If it is deleted (unlinked at start also means deleted)
* we treat the file size as being zeroed at this point.
*/
if (parentObjectId ==
YAFFS_OBJECTID_DELETED
|| parentObjectId ==
YAFFS_OBJECTID_UNLINKED) {
thisSize = 0;
isShrink = 1;
}
if (isShrink &&
in->variant.fileVariant.
shrinkSize > thisSize) {
in->variant.fileVariant.
shrinkSize =
thisSize;
}
if (isShrink) {
bi->hasShrinkHeader = 1;
}
}
/* Use existing - destroy this one. */
yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
}
if (!in->valid &&
(tags.objectId == YAFFS_OBJECTID_ROOT ||
tags.objectId ==
YAFFS_OBJECTID_LOSTNFOUND)) {
/* We only load some info, don't fiddle with directory structure */
in->valid = 1;
if(oh) {
in->variantType = oh->type;
in->yst_mode = oh->yst_mode;
#ifdef CONFIG_YAFFS_WINCE
in->win_atime[0] = oh->win_atime[0];
in->win_ctime[0] = oh->win_ctime[0];
in->win_mtime[0] = oh->win_mtime[0];
in->win_atime[1] = oh->win_atime[1];
in->win_ctime[1] = oh->win_ctime[1];
in->win_mtime[1] = oh->win_mtime[1];
#else
in->yst_uid = oh->yst_uid;
in->yst_gid = oh->yst_gid;
in->yst_atime = oh->yst_atime;
in->yst_mtime = oh->yst_mtime;
in->yst_ctime = oh->yst_ctime;
in->yst_rdev = oh->yst_rdev;
#endif
} else {
in->variantType = tags.extraObjectType;
in->lazyLoaded = 1;
}
in->chunkId = chunk;
} else if (!in->valid) {
/* we need to load this info */
in->valid = 1;
in->chunkId = chunk;
if(oh) {
in->variantType = oh->type;
in->yst_mode = oh->yst_mode;
#ifdef CONFIG_YAFFS_WINCE
in->win_atime[0] = oh->win_atime[0];
in->win_ctime[0] = oh->win_ctime[0];
in->win_mtime[0] = oh->win_mtime[0];
in->win_atime[1] = oh->win_atime[1];
in->win_ctime[1] = oh->win_ctime[1];
in->win_mtime[1] = oh->win_mtime[1];
#else
in->yst_uid = oh->yst_uid;
in->yst_gid = oh->yst_gid;
in->yst_atime = oh->yst_atime;
in->yst_mtime = oh->yst_mtime;
in->yst_ctime = oh->yst_ctime;
in->yst_rdev = oh->yst_rdev;
#endif
if (oh->shadowsObject > 0)
yaffs_HandleShadowedObject(dev,
oh->
shadowsObject,
1);
yaffs_SetObjectName(in, oh->name);
parent =
yaffs_FindOrCreateObjectByNumber
(dev, oh->parentObjectId,
YAFFS_OBJECT_TYPE_DIRECTORY);
fileSize = oh->fileSize;
isShrink = oh->isShrink;
equivalentObjectId = oh->equivalentObjectId;
}
else {
in->variantType = tags.extraObjectType;
parent =
yaffs_FindOrCreateObjectByNumber
(dev, tags.extraParentObjectId,
YAFFS_OBJECT_TYPE_DIRECTORY);
fileSize = tags.extraFileLength;
isShrink = tags.extraIsShrinkHeader;
equivalentObjectId = tags.extraEquivalentObjectId;
in->lazyLoaded = 1;
}
in->dirty = 0;
/* directory stuff...
* hook up to parent
*/
if (parent->variantType ==
YAFFS_OBJECT_TYPE_UNKNOWN) {
/* Set up as a directory */
parent->variantType =
YAFFS_OBJECT_TYPE_DIRECTORY;
INIT_LIST_HEAD(&parent->variant.
directoryVariant.
children);
} else if (parent->variantType !=
YAFFS_OBJECT_TYPE_DIRECTORY)
{
/* Hoosterman, another problem....
* We're trying to use a non-directory as a directory
*/
T(YAFFS_TRACE_ERROR,
(TSTR
("yaffs tragedy: attempting to use non-directory as"
" a directory in scan. Put in lost+found."
TENDSTR)));
parent = dev->lostNFoundDir;
}
yaffs_AddObjectToDirectory(parent, in);
itsUnlinked = (parent == dev->deletedDir) ||
(parent == dev->unlinkedDir);
if (isShrink) {
/* Mark the block as having a shrinkHeader */
bi->hasShrinkHeader = 1;
}
/* Note re hardlinks.
* Since we might scan a hardlink before its equivalent object is scanned
* we put them all in a list.
* After scanning is complete, we should have all the objects, so we run
* through this list and fix up all the chains.
*/
switch (in->variantType) {
case YAFFS_OBJECT_TYPE_UNKNOWN:
/* Todo got a problem */
break;
case YAFFS_OBJECT_TYPE_FILE:
if (in->variant.fileVariant.
scannedFileSize < fileSize) {
/* This covers the case where the file size is greater
* than where the data is
* This will happen if the file is resized to be larger
* than its current data extents.
*/
in->variant.fileVariant.fileSize = fileSize;
in->variant.fileVariant.scannedFileSize =
in->variant.fileVariant.fileSize;
}
if (isShrink &&
in->variant.fileVariant.shrinkSize > fileSize) {
in->variant.fileVariant.shrinkSize = fileSize;
}
break;
case YAFFS_OBJECT_TYPE_HARDLINK:
if(!itsUnlinked) {
in->variant.hardLinkVariant.equivalentObjectId =
equivalentObjectId;
in->hardLinks.next =
(struct list_head *) hardList;
hardList = in;
}
break;
case YAFFS_OBJECT_TYPE_DIRECTORY:
/* Do nothing */
break;
case YAFFS_OBJECT_TYPE_SPECIAL:
/* Do nothing */
break;
case YAFFS_OBJECT_TYPE_SYMLINK:
if(oh)
in->variant.symLinkVariant.alias =
yaffs_CloneString(oh->
alias);
break;
}
}
}
}
if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
/* If we got this far while scanning, then the block is fully allocated. */
state = YAFFS_BLOCK_STATE_FULL;
}
bi->blockState = state;
/* Now let's see if it was dirty */
if (bi->pagesInUse == 0 &&
!bi->hasShrinkHeader &&
bi->blockState == YAFFS_BLOCK_STATE_FULL) {
yaffs_BlockBecameDirty(dev, blk);
}
}
if (altBlockIndex)
YFREE_ALT(blockIndex);
else
YFREE(blockIndex);
/* Ok, we've done all the scanning.
* Fix up the hard link chains.
* We should now have scanned all the objects, now it's time to add these
* hardlinks.
*/
yaffs_HardlinkFixup(dev,hardList);
/*
* Sort out state of unlinked and deleted objects.
*/
{
struct list_head *i;
struct list_head *n;
yaffs_Object *l;
/* Soft delete all the unlinked files */
list_for_each_safe(i, n,
&dev->unlinkedDir->variant.directoryVariant.
children) {
if (i) {
l = list_entry(i, yaffs_Object, siblings);
yaffs_DestroyObject(l);
}
}
/* Soft delete all the deletedDir files */
list_for_each_safe(i, n,
&dev->deletedDir->variant.directoryVariant.
children) {
if (i) {
l = list_entry(i, yaffs_Object, siblings);
yaffs_DestroyObject(l);
}
}
}
yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
return YAFFS_OK;
}
/*------------------------------ Directory Functions ----------------------------- */
static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj)
{
yaffs_Device *dev = obj->myDev;
if(dev && dev->removeObjectCallback)
dev->removeObjectCallback(obj);
list_del_init(&obj->siblings);
obj->parent = NULL;
}
static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
yaffs_Object * obj)
{
if (!directory) {
T(YAFFS_TRACE_ALWAYS,
(TSTR
("tragedy: Trying to add an object to a null pointer directory"
TENDSTR)));
YBUG();
}
if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
T(YAFFS_TRACE_ALWAYS,
(TSTR
("tragedy: Trying to add an object to a non-directory"
TENDSTR)));
YBUG();
}
if (obj->siblings.prev == NULL) {
/* Not initialised */
INIT_LIST_HEAD(&obj->siblings);
} else if (!list_empty(&obj->siblings)) {
/* If it is holed up somewhere else, un hook it */
yaffs_RemoveObjectFromDirectory(obj);
}
/* Now add it */
list_add(&obj->siblings, &directory->variant.directoryVariant.children);
obj->parent = directory;
if (directory == obj->myDev->unlinkedDir
|| directory == obj->myDev->deletedDir) {
obj->unlinked = 1;
obj->myDev->nUnlinkedFiles++;
obj->renameAllowed = 0;
}
}
yaffs_Object *yaffs_FindObjectByName(yaffs_Object * directory,
const YCHAR * name)
{
int sum;
struct list_head *i;
YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
yaffs_Object *l;
if (!name) {
return NULL;
}
if (!directory) {
T(YAFFS_TRACE_ALWAYS,
(TSTR
("tragedy: yaffs_FindObjectByName: null pointer directory"
TENDSTR)));
YBUG();
}
if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
T(YAFFS_TRACE_ALWAYS,
(TSTR
("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
YBUG();
}
sum = yaffs_CalcNameSum(name);
list_for_each(i, &directory->variant.directoryVariant.children) {
if (i) {
l = list_entry(i, yaffs_Object, siblings);
yaffs_CheckObjectDetailsLoaded(l);
/* Special case for lost-n-found */
if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0) {
return l;
}
} else if (yaffs_SumCompare(l->sum, sum) || l->chunkId <= 0)
{
/* LostnFound cunk called Objxxx
* Do a real check
*/
yaffs_GetObjectName(l, buffer,
YAFFS_MAX_NAME_LENGTH);
if (yaffs_strcmp(name, buffer) == 0) {
return l;
}
}
}
}
return NULL;
}
#if 0
int yaffs_ApplyToDirectoryChildren(yaffs_Object * theDir,
int (*fn) (yaffs_Object *))
{
struct list_head *i;
yaffs_Object *l;
if (!theDir) {
T(YAFFS_TRACE_ALWAYS,
(TSTR
("tragedy: yaffs_FindObjectByName: null pointer directory"
TENDSTR)));
YBUG();
}
if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
T(YAFFS_TRACE_ALWAYS,
(TSTR
("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
YBUG();
}
list_for_each(i, &theDir->variant.directoryVariant.children) {
if (i) {
l = list_entry(i, yaffs_Object, siblings);
if (l && !fn(l)) {
return YAFFS_FAIL;
}
}
}
return YAFFS_OK;
}
#endif
/* GetEquivalentObject dereferences any hard links to get to the
* actual object.
*/
yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object * obj)
{
if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
/* We want the object id of the equivalent object, not this one */
obj = obj->variant.hardLinkVariant.equivalentObject;
}
return obj;
}
int yaffs_GetObjectName(yaffs_Object * obj, YCHAR * name, int buffSize)
{
memset(name, 0, buffSize * sizeof(YCHAR));
yaffs_CheckObjectDetailsLoaded(obj);
if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
} else if (obj->chunkId <= 0) {
YCHAR locName[20];
/* make up a name */
yaffs_sprintf(locName, _Y("%s%d"), YAFFS_LOSTNFOUND_PREFIX,
obj->objectId);
yaffs_strncpy(name, locName, buffSize - 1);
}
#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
else if (obj->shortName[0]) {
yaffs_strcpy(name, obj->shortName);
}
#endif
else {
int result;
__u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
if (obj->chunkId >= 0) {
result = yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
obj->chunkId, buffer,
NULL);
}
yaffs_strncpy(name, oh->name, buffSize - 1);
yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
}
return yaffs_strlen(name);
}
int yaffs_GetObjectFileLength(yaffs_Object * obj)
{
/* Dereference any hard linking */
obj = yaffs_GetEquivalentObject(obj);
if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
return obj->variant.fileVariant.fileSize;
}
if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
return yaffs_strlen(obj->variant.symLinkVariant.alias);
} else {
/* Only a directory should drop through to here */
return obj->myDev->nDataBytesPerChunk;
}
}
int yaffs_GetObjectLinkCount(yaffs_Object * obj)
{
int count = 0;
struct list_head *i;
if (!obj->unlinked) {
count++; /* the object itself */
}
list_for_each(i, &obj->hardLinks) {
count++; /* add the hard links; */
}
return count;
}
int yaffs_GetObjectInode(yaffs_Object * obj)
{
obj = yaffs_GetEquivalentObject(obj);
return obj->objectId;
}
unsigned yaffs_GetObjectType(yaffs_Object * obj)
{
obj = yaffs_GetEquivalentObject(obj);
switch (obj->variantType) {
case YAFFS_OBJECT_TYPE_FILE:
return DT_REG;
break;
case YAFFS_OBJECT_TYPE_DIRECTORY:
return DT_DIR;
break;
case YAFFS_OBJECT_TYPE_SYMLINK:
return DT_LNK;
break;
case YAFFS_OBJECT_TYPE_HARDLINK:
return DT_REG;
break;
case YAFFS_OBJECT_TYPE_SPECIAL:
if (S_ISFIFO(obj->yst_mode))
return DT_FIFO;
if (S_ISCHR(obj->yst_mode))
return DT_CHR;
if (S_ISBLK(obj->yst_mode))
return DT_BLK;
if (S_ISSOCK(obj->yst_mode))
return DT_SOCK;
default:
return DT_REG;
break;
}
}
YCHAR *yaffs_GetSymlinkAlias(yaffs_Object * obj)
{
obj = yaffs_GetEquivalentObject(obj);
if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
return yaffs_CloneString(obj->variant.symLinkVariant.alias);
} else {
return yaffs_CloneString(_Y(""));
}
}
#ifndef CONFIG_YAFFS_WINCE
int yaffs_SetAttributes(yaffs_Object * obj, struct iattr *attr)
{
unsigned int valid = attr->ia_valid;
if (valid & ATTR_MODE)
obj->yst_mode = attr->ia_mode;
if (valid & ATTR_UID)
obj->yst_uid = attr->ia_uid;
if (valid & ATTR_GID)
obj->yst_gid = attr->ia_gid;
if (valid & ATTR_ATIME)
obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
if (valid & ATTR_CTIME)
obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
if (valid & ATTR_MTIME)
obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
if (valid & ATTR_SIZE)
yaffs_ResizeFile(obj, attr->ia_size);
yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
return YAFFS_OK;
}
int yaffs_GetAttributes(yaffs_Object * obj, struct iattr *attr)
{
unsigned int valid = 0;
attr->ia_mode = obj->yst_mode;
valid |= ATTR_MODE;
attr->ia_uid = obj->yst_uid;
valid |= ATTR_UID;
attr->ia_gid = obj->yst_gid;
valid |= ATTR_GID;
Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
valid |= ATTR_ATIME;
Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
valid |= ATTR_CTIME;
Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
valid |= ATTR_MTIME;
attr->ia_size = yaffs_GetFileSize(obj);
valid |= ATTR_SIZE;
attr->ia_valid = valid;
return YAFFS_OK;
}
#endif
#if 0
int yaffs_DumpObject(yaffs_Object * obj)
{
YCHAR name[257];
yaffs_GetObjectName(obj, name, 256);
T(YAFFS_TRACE_ALWAYS,
(TSTR
("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
" chunk %d type %d size %d\n"
TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
obj->dirty, obj->valid, obj->serial, obj->sum, obj->chunkId,
yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
return YAFFS_OK;
}
#endif
/*---------------------------- Initialisation code -------------------------------------- */
static int yaffs_CheckDevFunctions(const yaffs_Device * dev)
{
/* Common functions, gotta have */
if (!dev->eraseBlockInNAND || !dev->initialiseNAND)
return 0;
#ifdef CONFIG_YAFFS_YAFFS2
/* Can use the "with tags" style interface for yaffs1 or yaffs2 */
if (dev->writeChunkWithTagsToNAND &&
dev->readChunkWithTagsFromNAND &&
!dev->writeChunkToNAND &&
!dev->readChunkFromNAND &&
dev->markNANDBlockBad && dev->queryNANDBlock)
return 1;
#endif
/* Can use the "spare" style interface for yaffs1 */
if (!dev->isYaffs2 &&
!dev->writeChunkWithTagsToNAND &&
!dev->readChunkWithTagsFromNAND &&
dev->writeChunkToNAND &&
dev->readChunkFromNAND &&
!dev->markNANDBlockBad && !dev->queryNANDBlock)
return 1;
return 0; /* bad */
}
static void yaffs_CreateInitialDirectories(yaffs_Device *dev)
{
/* Initialise the unlinked, deleted, root and lost and found directories */
dev->lostNFoundDir = dev->rootDir = NULL;
dev->unlinkedDir = dev->deletedDir = NULL;
dev->unlinkedDir =
yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
dev->deletedDir =
yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
dev->rootDir =
yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
YAFFS_ROOT_MODE | S_IFDIR);
dev->lostNFoundDir =
yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
YAFFS_LOSTNFOUND_MODE | S_IFDIR);
yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
}
int yaffs_GutsInitialise(yaffs_Device * dev)
{
unsigned x;
int bits;
T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
/* Check stuff that must be set */
if (!dev) {
T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
return YAFFS_FAIL;
}
dev->internalStartBlock = dev->startBlock;
dev->internalEndBlock = dev->endBlock;
dev->blockOffset = 0;
dev->chunkOffset = 0;
dev->nFreeChunks = 0;
if (dev->startBlock == 0) {
dev->internalStartBlock = dev->startBlock + 1;
dev->internalEndBlock = dev->endBlock + 1;
dev->blockOffset = 1;
dev->chunkOffset = dev->nChunksPerBlock;
}
/* Check geometry parameters. */
if ((dev->isYaffs2 && dev->nDataBytesPerChunk < 1024) ||
(!dev->isYaffs2 && dev->nDataBytesPerChunk != 512) ||
dev->nChunksPerBlock < 2 ||
dev->nReservedBlocks < 2 ||
dev->internalStartBlock <= 0 ||
dev->internalEndBlock <= 0 ||
dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2) // otherwise it is too small
) {
T(YAFFS_TRACE_ALWAYS,
(TSTR
("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s "
TENDSTR), dev->nDataBytesPerChunk, dev->isYaffs2 ? "2" : ""));
return YAFFS_FAIL;
}
if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
T(YAFFS_TRACE_ALWAYS,
(TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
return YAFFS_FAIL;
}
/* Got the right mix of functions? */
if (!yaffs_CheckDevFunctions(dev)) {
/* Function missing */
T(YAFFS_TRACE_ALWAYS,
(TSTR
("yaffs: device function(s) missing or wrong\n" TENDSTR)));
return YAFFS_FAIL;
}
/* This is really a compilation check. */
if (!yaffs_CheckStructures()) {
T(YAFFS_TRACE_ALWAYS,
(TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
return YAFFS_FAIL;
}
if (dev->isMounted) {
T(YAFFS_TRACE_ALWAYS,
(TSTR("yaffs: device already mounted\n" TENDSTR)));
return YAFFS_FAIL;
}
/* Finished with most checks. One or two more checks happen later on too. */
dev->isMounted = 1;
/* OK now calculate a few things for the device */
/*
* Calculate all the chunk size manipulation numbers:
*/
/* Start off assuming it is a power of 2 */
dev->chunkShift = ShiftDiv(dev->nDataBytesPerChunk);
dev->chunkMask = (1<<dev->chunkShift) - 1;
if(dev->nDataBytesPerChunk == (dev->chunkMask + 1)){
/* Yes it is a power of 2, disable crumbs */
dev->crumbMask = 0;
dev->crumbShift = 0;
dev->crumbsPerChunk = 0;
} else {
/* Not a power of 2, use crumbs instead */
dev->crumbShift = ShiftDiv(sizeof(yaffs_PackedTags2TagsPart));
dev->crumbMask = (1<<dev->crumbShift)-1;
dev->crumbsPerChunk = dev->nDataBytesPerChunk/(1 << dev->crumbShift);
dev->chunkShift = 0;
dev->chunkMask = 0;
}
/*
* Calculate chunkGroupBits.
* We need to find the next power of 2 > than internalEndBlock
*/
x = dev->nChunksPerBlock * (dev->internalEndBlock + 1);
bits = ShiftsGE(x);
/* Set up tnode width if wide tnodes are enabled. */
if(!dev->wideTnodesDisabled){
/* bits must be even so that we end up with 32-bit words */
if(bits & 1)
bits++;
if(bits < 16)
dev->tnodeWidth = 16;
else
dev->tnodeWidth = bits;
}
else
dev->tnodeWidth = 16;
dev->tnodeMask = (1<<dev->tnodeWidth)-1;
/* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
* so if the bitwidth of the
* chunk range we're using is greater than 16 we need
* to figure out chunk shift and chunkGroupSize
*/
if (bits <= dev->tnodeWidth)
dev->chunkGroupBits = 0;
else
dev->chunkGroupBits = bits - dev->tnodeWidth;
dev->chunkGroupSize = 1 << dev->chunkGroupBits;
if (dev->nChunksPerBlock < dev->chunkGroupSize) {
/* We have a problem because the soft delete won't work if
* the chunk group size > chunks per block.
* This can be remedied by using larger "virtual blocks".
*/
T(YAFFS_TRACE_ALWAYS,
(TSTR("yaffs: chunk group too large\n" TENDSTR)));
return YAFFS_FAIL;
}
/* OK, we've finished verifying the device, lets continue with initialisation */
/* More device initialisation */
dev->garbageCollections = 0;
dev->passiveGarbageCollections = 0;
dev->currentDirtyChecker = 0;
dev->bufferedBlock = -1;
dev->doingBufferedBlockRewrite = 0;
dev->nDeletedFiles = 0;
dev->nBackgroundDeletions = 0;
dev->nUnlinkedFiles = 0;
dev->eccFixed = 0;
dev->eccUnfixed = 0;
dev->tagsEccFixed = 0;
dev->tagsEccUnfixed = 0;
dev->nErasureFailures = 0;
dev->nErasedBlocks = 0;
dev->isDoingGC = 0;
dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
/* Initialise temporary buffers and caches. */
{
int i;
for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
dev->tempBuffer[i].line = 0; /* not in use */
dev->tempBuffer[i].buffer =
YMALLOC_DMA(dev->nDataBytesPerChunk);
}
}
if (dev->nShortOpCaches > 0) {
int i;
if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES) {
dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
}
dev->srCache =
YMALLOC(dev->nShortOpCaches * sizeof(yaffs_ChunkCache));
for (i = 0; i < dev->nShortOpCaches; i++) {
dev->srCache[i].object = NULL;
dev->srCache[i].lastUse = 0;
dev->srCache[i].dirty = 0;
dev->srCache[i].data = YMALLOC_DMA(dev->nDataBytesPerChunk);
}
dev->srLastUse = 0;
}
dev->cacheHits = 0;
dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
if (dev->isYaffs2) {
dev->useHeaderFileSize = 1;
}
yaffs_InitialiseBlocks(dev);
yaffs_InitialiseTnodes(dev);
yaffs_InitialiseObjects(dev);
yaffs_CreateInitialDirectories(dev);
/* Now scan the flash. */
if (dev->isYaffs2) {
if(yaffs_CheckpointRestore(dev)) {
T(YAFFS_TRACE_ALWAYS,
(TSTR("yaffs: restored from checkpoint" TENDSTR)));
} else {
/* Clean up the mess caused by an aborted checkpoint load
* and scan backwards.
*/
yaffs_DeinitialiseBlocks(dev);
yaffs_DeinitialiseTnodes(dev);
yaffs_DeinitialiseObjects(dev);
yaffs_InitialiseBlocks(dev);
yaffs_InitialiseTnodes(dev);
yaffs_InitialiseObjects(dev);
yaffs_CreateInitialDirectories(dev);
yaffs_ScanBackwards(dev);
}
}else
yaffs_Scan(dev);
/* Zero out stats */
dev->nPageReads = 0;
dev->nPageWrites = 0;
dev->nBlockErasures = 0;
dev->nGCCopies = 0;
dev->nRetriedWrites = 0;
dev->nRetiredBlocks = 0;
yaffs_VerifyFreeChunks(dev);
T(YAFFS_TRACE_TRACING,
(TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
return YAFFS_OK;
}
void yaffs_Deinitialise(yaffs_Device * dev)
{
if (dev->isMounted) {
int i;
yaffs_DeinitialiseBlocks(dev);
yaffs_DeinitialiseTnodes(dev);
yaffs_DeinitialiseObjects(dev);
if (dev->nShortOpCaches > 0) {
for (i = 0; i < dev->nShortOpCaches; i++) {
YFREE(dev->srCache[i].data);
}
YFREE(dev->srCache);
}
YFREE(dev->gcCleanupList);
for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
YFREE(dev->tempBuffer[i].buffer);
}
dev->isMounted = 0;
}
}
static int yaffs_CountFreeChunks(yaffs_Device * dev)
{
int nFree;
int b;
yaffs_BlockInfo *blk;
for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
b++) {
blk = yaffs_GetBlockInfo(dev, b);
switch (blk->blockState) {
case YAFFS_BLOCK_STATE_EMPTY:
case YAFFS_BLOCK_STATE_ALLOCATING:
case YAFFS_BLOCK_STATE_COLLECTING:
case YAFFS_BLOCK_STATE_FULL:
nFree +=
(dev->nChunksPerBlock - blk->pagesInUse +
blk->softDeletions);
break;
default:
break;
}
}
return nFree;
}
int yaffs_GetNumberOfFreeChunks(yaffs_Device * dev)
{
/* This is what we report to the outside world */
int nFree;
int nDirtyCacheChunks;
int blocksForCheckpoint;
#if 1
nFree = dev->nFreeChunks;
#else
nFree = yaffs_CountFreeChunks(dev);
#endif
nFree += dev->nDeletedFiles;
/* Now count the number of dirty chunks in the cache and subtract those */
{
int i;
for (nDirtyCacheChunks = 0, i = 0; i < dev->nShortOpCaches; i++) {
if (dev->srCache[i].dirty)
nDirtyCacheChunks++;
}
}
nFree -= nDirtyCacheChunks;
nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
/* Now we figure out how much to reserve for the checkpoint and report that... */
blocksForCheckpoint = dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint;
if(blocksForCheckpoint < 0)
blocksForCheckpoint = 0;
nFree -= (blocksForCheckpoint * dev->nChunksPerBlock);
if (nFree < 0)
nFree = 0;
return nFree;
}
static int yaffs_freeVerificationFailures;
static void yaffs_VerifyFreeChunks(yaffs_Device * dev)
{
int counted = yaffs_CountFreeChunks(dev);
int difference = dev->nFreeChunks - counted;
if (difference) {
T(YAFFS_TRACE_ALWAYS,
(TSTR("Freechunks verification failure %d %d %d" TENDSTR),
dev->nFreeChunks, counted, difference));
yaffs_freeVerificationFailures++;
}
}
/*---------------------------------------- YAFFS test code ----------------------*/
#define yaffs_CheckStruct(structure,syze, name) \
if(sizeof(structure) != syze) \
{ \
T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),\
name,syze,sizeof(structure))); \
return YAFFS_FAIL; \
}
static int yaffs_CheckStructures(void)
{
/* yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags") */
/* yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion") */
/* yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare") */
#ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode")
#endif
yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader")
return YAFFS_OK;
}