int soReadFileCluster (uint32_t nInode, uint32_t clustInd, SODataClust *buff)
{
soColorProbe (411, "07;31", "soReadFileCluster (%"PRIu32", %"PRIu32", %p)\n", nInode, clustInd, buff);
int stat, i;
SOSuperBlock *p_sb;
SODataClust cluster;
uint32_t numDC, nFClust;
if( (stat = soLoadSuperBlock()) != 0){
return stat;
}
p_sb = soGetSuperBlock();
if(nInode >= p_sb->iTotal){
return -EINVAL;
}
if(buff == NULL){
return -EINVAL;
}
if(clustInd >= MAX_FILE_CLUSTERS){
return -EINVAL;
}
if((stat = soHandleFileCluster(nInode, clustInd, GET, &numDC)) != 0){
return stat;
}
if(numDC == NULL_CLUSTER){
for(i = 0; i < BSLPC; i++)
{
buff->info.data[i] = '\0';
}
}
else{
nFClust = p_sb->dZoneStart + numDC * BLOCKS_PER_CLUSTER;
if( (stat = soReadCacheCluster(nFClust, &cluster)) != 0){
return stat;
}
memcpy(buff, &cluster, sizeof(SODataClust));
if((stat = soWriteCacheCluster(nFClust, &cluster)) != 0){
return stat;
}
}
if( (stat = soStoreSuperBlock()) != 0){
return stat;
}
return 0;
}
int soAllocInode (uint32_t type, uint32_t* p_nInode)
{
soProbe (411, "soAllocInode (%"PRIu32", %p)\n", type, p_nInode);
/** Variables **/
int status;
SOSuperBlock *sb;
SOInode *headInode;
SOInode *nextInode;
uint32_t headBlock;
uint32_t nextBlock;
uint32_t headOffset;
uint32_t nextOffset;
uint32_t nInode;
/** Parameter check **/
if((type != INODE_DIR) && (type != INODE_FILE) && (type != INODE_SYMLINK))
return -EINVAL;
if(p_nInode == NULL)
return -EINVAL;
/** Loading SuperBlock **/
if((status = soLoadSuperBlock()) != 0)
return status;
if((sb = soGetSuperBlock()) == NULL)
return -EBADF;
/** Inode table consistency check **/
if((status = soQCheckInT(sb)) != 0)
return status;
/** Check if there are free inodes **/
if(sb->ifree == 0)
return -ENOSPC;
/** Obtain Block number and inode offset **/
if((status = soConvertRefInT(sb->ihead, &headBlock, &headOffset)) != 0)
return status;
/** Read head inode from inode table **/
if((status = soLoadBlockInT(headBlock)) != 0)
return status;
headInode = soGetBlockInT();
/** Check if inode is free **/
if((status = soQCheckFInode(&headInode[headOffset])) != 0)
return status;
/** Allocated inode number **/
nInode = sb->ihead;
/**Update Superblock reference to head of double-linked list of free headInodes**/
if(sb->ifree == 1)
{
sb->ihead = NULL_INODE;
sb->itail = NULL_INODE;
}
else
sb->ihead = headInode[headOffset].vD1.next;
/** Update next inode information **/
if(sb->ihead != NULL_INODE)
{
if((status = soConvertRefInT(sb->ihead, &nextBlock, &nextOffset)) != 0)
return status;
if((status = soLoadBlockInT(nextBlock)) != 0)
return status;
nextInode = soGetBlockInT();
nextInode[nextOffset].vD2.prev = NULL_INODE;
if((status = soStoreBlockInT()) != 0)
return status;
}
/** Update and write superblock **/
sb->ifree--;
if((status = soStoreSuperBlock()) != 0)
return status;
/** "Re-Obtain" Block number and inode offset **/
if((status = soConvertRefInT(nInode, &headBlock, &headOffset)) != 0)
return status;
/** "Re-Read" head inode from inode table **/
if((status = soLoadBlockInT(headBlock)) != 0)
return status;
headInode = soGetBlockInT();
/** Check if headInode is in dirty state **/
if((status = soQCheckFCInode(&headInode[headOffset])) != 0)
{
if((status = soCleanInode(headBlock * IPB + headOffset)) != 0)
return status;
/*Since inode was updated, it will be readed again*/
if((status = soConvertRefInT(nInode, &headBlock, &headOffset)) != 0)
return status;
/*Read head inode from inode table*/
if((status = soLoadBlockInT(headBlock)) != 0)
return status;
headInode = soGetBlockInT();
}
/** Allocate headInode **/
headInode[headOffset].mode = type;
headInode[headOffset].refcount = 0;
headInode[headOffset].owner = getuid();
headInode[headOffset].group = getgid();
headInode[headOffset].size = 0;
headInode[headOffset].clucount = 0;
headInode[headOffset].vD1.atime = time(NULL);
headInode[headOffset].vD2.mtime = headInode[headOffset].vD1.atime;
/*Write updated inode information to disk*/
if((status = soStoreBlockInT()) != 0)
return status;
/*Consistency check*/
if((status = soQCheckInodeIU(sb, &headInode[headOffset])) != 0)
return status;
/** Operation successful **/
*p_nInode = nInode;
return 0;
}
int soAllocDataCluster(uint32_t nInode, uint32_t *p_nClust) {
soColorProbe(613, "07;33", "soAllocDataCluster (%"PRIu32", %p)\n", nInode, p_nClust);
int stat; // variavel para o estado de erro
//uint32_t nClust, clusterStat, NFClt; //variaveis para localizar o cluster, contem variavel extra usada no teste de consistencia do header do cluster
SOSuperBlock *p_sb; //ponteiro para o superbloco
SODataClust cluster; //ponteiro para o cluster que vai ser reservado
SOInode *p_inode;
uint32_t nBlock, offset, nClust, clusterStat, NFClt;
//carregar o super bloco
if ((stat = soLoadSuperBlock()) != 0)
return stat;
p_sb = soGetSuperBlock();
//if ((stat = soQCheckSuperBlock(p_sb)) != 0)
// return stat;
if ((stat = soQCheckDZ(p_sb)) != 0)
return stat;
//carregar inode pretendido
if ((stat = soConvertRefInT(nInode, &nBlock, &offset)) != 0)
return stat;
if ((stat = soLoadBlockInT(nBlock)) != 0)
return stat;
p_inode = soGetBlockInT();
//teste de consistencia ao inode
if ((stat = soQCheckInodeIU(p_sb, &p_inode[offset])) != 0)
return stat;
//guardar o inode so precisavamos de testar a consistencia
if ((stat = soStoreBlockInT()) != 0)
return stat;
//teste se o inode pretendido de encontra dentro dos valores possiveis e se o ponteiro nao vem com NULL_CLUSTER associado
if (nInode > p_sb->iTotal - 1 || p_nClust == NULL)
return -EINVAL;
//verificar se ha clusters livres
if (p_sb->dZoneFree == 0)
return -ENOSPC;
//se a cache estiver vazia, enche-la
if (p_sb->dZoneRetriev.cacheIdx == DZONE_CACHE_SIZE)
soReplenish(p_sb);
//carregar o super bloco
if ((stat = soLoadSuperBlock()) != 0)
return stat;
p_sb = soGetSuperBlock();
//nclust = numero logico do cluster
nClust = p_sb->dZoneRetriev.cache[p_sb->dZoneRetriev.cacheIdx]; // passar o numero do proximo cluster livre para nClust
//teste de consistencia ao proximo cluster a reservar
if ((stat = soQCheckStatDC(p_sb, nClust, &clusterStat)) != 0)
return stat;
//ir buscar o cluster nClust. nClust precisa de ser o numero fisico
//relação entre numero fisico e numero logico
//NFClt = dzone_start + NLClt * BLOCKS_PER_CLUSTER;
NFClt = p_sb->dZoneStart + nClust * BLOCKS_PER_CLUSTER;
if ((stat = soReadCacheCluster(NFClt, &cluster)) != 0)
return stat;
// codigo deste if, vem do pdf "manipulacao do cluster de dados", slide 23
// check if the data cluster is dirty
if (cluster.stat != NULL_INODE) {
if ((stat = soCleanDataCluster(cluster.stat, nClust)) != 0)
return stat;
}
p_sb->dZoneRetriev.cache[p_sb->dZoneRetriev.cacheIdx] = NULL_CLUSTER; //esse cluster já nao vai estar disponivel, por isso NULL_CLUSTER
p_sb->dZoneRetriev.cacheIdx += 1;
p_sb->dZoneFree -= 1;
cluster.prev = cluster.next = NULL_CLUSTER;
cluster.stat = nInode;
//atribuir o numero do cluster ao ponteiro fornecido nos argumentos para esse efeito
*p_nClust = nClust;
//voltar a guardar o cluster
if ((stat = soWriteCacheCluster(NFClt, &cluster)) != 0)
return stat;
//voltar a guardar o super bloco
if ((stat = soStoreSuperBlock()) != 0)
return stat;
return 0;
}
int soAllocInode (uint32_t type, uint32_t* p_nInode)
{
soColorProbe (611, "07;31", "soAllocInode (%"PRIu32", %p)\n", type, p_nInode);
SOInode *array;
SOSuperBlock *p_sb;
uint32_t numBlock, offset, next;
int status, i;
// Se o type não existe ou ponteiro p_nInode é nulo
if((type != INODE_DIR && type != INODE_FILE && type != INODE_SYMLINK) || p_nInode == NULL)
return -EINVAL;
// Superbloco na memória
if((status = soLoadSuperBlock()) != 0)
return status;
// Ponteiro do superbloco
if (!(p_sb = soGetSuperBlock()))
return -EIO;
// Tem de haver pelo menos um nó livre na lista de nós livres
if(p_sb->ifree == 0)
{
return -ENOSPC;
}
// Verifica se a tabela de inodes esta consistente
if ((status = soQCheckSuperBlock(p_sb)) != 0)
{
return status;
}
*p_nInode = p_sb->ihead;
// Obter nº bloco e o offset do inode
if ((status = soConvertRefInT(p_sb->ihead, &numBlock, &offset)))
{
return status;
}
// Ler o bloco do primeiro nó livre
if ((status = soLoadBlockInT(numBlock)))
{
return status;
}
array = soGetBlockInT();
next = array[offset].vD2.next;
// Preenchimento
array[offset].mode = type | 0x0;
array[offset].refcount = 0;
array[offset].owner = getuid();
array[offset].group = getgid();
array[offset].size = 0;
array[offset].clucount = 0;
for (i = 0; i < N_DIRECT; i++)
{
array[offset].d[i] = NULL_CLUSTER;
}
array[offset].i1 = NULL_CLUSTER;
array[offset].i2 = NULL_CLUSTER;
array[offset].vD1.atime = time(NULL);
array[offset].vD2.mtime = time(NULL);
// Algoritmo
if (p_sb->ifree == 1)
{
// A lista só tem um elemento
p_sb->ihead = NULL_INODE;
p_sb->itail = NULL_INODE;
if ((status = soStoreBlockInT()) != 0)
{
return status;
}
}
else{
// A lista tem dois ou mais elementos
// Actualiza ihead do bloco
p_sb->ihead = next;
// Guarda o inode
if ((status = soStoreBlockInT()) != 0)
{
return status;
}
// Nº Bloco e Offset inode head
if ((status = soConvertRefInT (next, &numBlock, &offset)) != 0)
{
return status;
}
// Como a lista não está vazia, vamos alterar o ihead
if ((status = soLoadBlockInT(numBlock)) != 0)
{
return status;
}
array = soGetBlockInT();
array[offset].vD1.prev = NULL_INODE;
// Guarda o inode
if ((status = soStoreBlockInT()) != 0)
{
return status;
}
}
// Decrementa o numero de free inodes
p_sb->ifree--;
// Guarda inode
if ((status = soStoreSuperBlock()) != 0)
{
return status;
}
return 0;
}
int soRead (const char *ePath, void *buff, uint32_t count, int32_t pos)
{
soColorProbe (229, "07;31", "soRead (\"%s\", %p, %u, %u)\n", ePath, buff, count, pos);
int stat; // variavel para o estado
SOSuperBlock *p_sb; // ponteiro para o super bloco
SOInode p_inode; // pointer to inode table for nBlk block position
uint32_t p_nInodeEnt; // ponteiro para a localizacao onde o nº do nó I associado à entrada é armazenado
uint32_t offset; // numero do offset ()
uint32_t p_clustInd; // ponteiro para indice do cluster
uint32_t p_clustIndF; // ponteiro para indice do cluster final
uint32_t offsetFinal; // offset final
int bytesRead = 0; // variável para indicar o numero de bytes lidos em sucesso
SODataClust p_buff; // ponteiro para o buffer
/*------VALIDATIONS----------*/
/* carregar super bloco*/
if( (stat = soLoadSuperBlock()) != 0)
return stat;
/* obter super bloco*/
p_sb = soGetSuperBlock();
/* if the pointer to the string is null */
if(ePath == NULL)
return -EINVAL;
/* if the path does not describe a absolute path*/
if(ePath[0] != '/')
return -EINVAL;
/*if the path name or any of its components exceed the maximum allowed length*/
if(strlen(ePath) > MAX_PATH)
return -ENAMETOOLONG;
/* Obter o Inode associado ao ePath e verificar se há erros */
if( (stat = soGetDirEntryByPath(ePath, NULL, &p_nInodeEnt)) != 0)
return stat;
/* Ler e verificar o inode (tem que ser um ficheiro regular) */
if( (stat = soReadInode(&p_inode, p_nInodeEnt, IUIN)) != 0)
return stat;
/*verificar se ePath descreve um directorio*/
if( (stat = soQCheckDirCont(p_sb, &p_inode)) != 0)
return -EISDIR;
/*if any of the components of ePath, but the last one, is not a directory*/
if( (stat != -ENOTDIR))
return stat;
/*verificar se o processo tem permissão de execucção*/
if( (stat = soAccessGranted(p_nInodeEnt, X)) != 0)
return -EACCES;
/*verificar se o processo tem permissao de leitura*/
if( (stat = soAccessGranted(p_nInodeEnt, R)) != 0)
return -EPERM;
/*if the starting [byte] position in the file data continuum assumes a value passing its maximum size*/
/*Verifica se o pos está fora do ficheiro*/
if(pos > p_inode.size)
return -EFBIG;
/*------END OF VALIDATIONS-------*/
/* Corrige o count se pos+count ultrapassar o limite do ficheiro */
if((pos + count) > p_inode.size)
count = p_inode.size - pos;
/* vai obter o clustInd e offset apartir do pos */
if( (stat = soConvertBPIDC(pos, &p_clustInd, &offset)) != 0)
return stat;
// byte position é definido como :
// pos = clustInd * BSLPC + offset
/* vai obter o clustInd e offset do final do ficheiro apartir do pos + count */
if( (stat = soConvertBPIDC(pos + count, &p_clustIndF, &offsetFinal)) != 0)
return stat;
/* leitura do 1º cluster do inode*/
if( (stat = soReadFileCluster(p_nInodeEnt, p_clustInd, &p_buff)) != 0)
return stat;
/* Se for necessario ler um pedaço do mesmo cluster */
if(p_clustInd == p_clustIndF)
{
memcpy(buff, &p_buff.info.data[BSLPC] + offset, (offsetFinal - offset));
bytesRead = offsetFinal - offset;
return bytesRead;
}
/*Se for para ler mais que 1 cluster, ler o resto do primeiro */
memcpy(buff, &p_buff.info.data[BSLPC] + offset, (BSLPC - offset));
bytesRead = BSLPC - offset;
p_clustInd++; // incrementa o indice do cluster
/* ler proximo cluster*/
if( (stat = soReadFileCluster(p_nInodeEnt, p_clustInd, &p_buff)) != 0)
return stat;
/* ler clusters "intermédios" */
while(p_clustInd < p_clustIndF)
{
memcpy(buff+bytesRead, &p_buff.info.data[BSLPC], BSLPC);
bytesRead += BSLPC;
/*ler proximo cluster */
if( (stat = soReadFileCluster(p_nInodeEnt, p_clustInd, &p_buff)) != 0)
return stat;
}
/* caso o que cluster que vamos ler é o ultimo*/
memcpy(buff + bytesRead, &p_buff.info.data[BSLPC], offsetFinal);
bytesRead += offsetFinal;
return bytesRead;
}
int soGetDirEntryByName (uint32_t nInodeDir, const char *eName, uint32_t *p_nInodeEnt, uint32_t *p_idx)
{
soColorProbe (312, "07;31", "soGetDirEntryByName (%"PRIu32", \"%s\", %p, %p)\n",
nInodeDir, eName, p_nInodeEnt, p_idx);
SOSuperBlock *p_sb;
SOInode p_Inode;
SODataClust clustDir;
// Variavel usada para retorno de erros
uint32_t status;
int i, j;
if((status = soLoadSuperBlock())!= 0){
return status;
}
p_sb = soGetSuperBlock();
if(nInodeDir >= p_sb->iTotal){
return -EINVAL;
}
// Verificação se o campo eName é igual a NULL ou esta vazio
if(eName == NULL || (strlen(eName))==0){
return -EINVAL;
}
// Verifica se a string nome excede o comprimento máximo
if(strlen(eName) > MAX_NAME){
return -ENAMETOOLONG;
}
// Verifica se a string é um nome de um ficheiro e não um caminho
for(i=0; eName[i]!='\0';i++) {
if(eName[i] == '/')
return -EINVAL;
}
// Le o inode. Verifica se está em uso
if((status = soReadInode(&p_Inode,nInodeDir,IUIN))){
return status;
}
// Verifica se o nó-i é do tipo diretório
if((p_Inode.mode & INODE_TYPE_MASK) != INODE_DIR){
return -ENOTDIR;
}
if((status = soQCheckDirCont(p_sb,&p_Inode))!=0){
return status;
}
// Verifica se existe permissão de execução
if((status = soAccessGranted(nInodeDir,X))!=0){
return status;
}
// Numero de entradas de directorio
uint32_t numRefMax = p_Inode.size/(DPC*sizeof(SODirEntry));
for (i = 0; i < numRefMax; i++){
//Le o conteudo do cluster referenciado pelo inode
if((status = soReadFileCluster(nInodeDir,i,&clustDir))){
return status;
}
// Procura pelo nome, verificando todas as entradas de directorio
for (j = 0; j < DPC; j++){
if (strcmp((char*)(clustDir.info.de[j].name),eName)==0){
// Se o argumento é diferente de NULL retorna o inode referenciado pelo nome
if(p_nInodeEnt != NULL){
*p_nInodeEnt = (clustDir.info.de[j].nInode);
}
if(p_idx != NULL){
*p_idx =((i*DPC)+j);
}
return 0;
}
// Verifica se a entrada j esta free
if((clustDir.info.de[j].name[0] == '\0') && (clustDir.info.de[j].name[MAX_NAME] == '\0')){
if(p_idx != NULL){
*p_idx = ((i*DPC)+j);
}
return -ENOENT;
}
}
}
// Se nao existir entradas free
if(p_idx != NULL){
*p_idx = (p_Inode.cluCount)*DPC;
}
return -ENOENT;
}
int soHandleFileCluster(uint32_t nInode, uint32_t clustInd, uint32_t op, uint32_t *p_outVal) {
soColorProbe(413, "07;31", "soHandleFileCluster (%"PRIu32", %"PRIu32", %"PRIu32", %p)\n",
nInode, clustInd, op, p_outVal);
int stat; // function return stat control
SOSuperBlock *p_sb; // pointer to the superblock
SOInode inode; // inode to fill with soReadInode
if ((stat = soLoadSuperBlock()))
return stat;
p_sb = soGetSuperBlock();
/* START OF VALIDATION */
/* if nInode is out of range */
if (nInode >= p_sb->iTotal)
return -EINVAL;
/* index (clustInd) to the list of direct references are out of range */
if (clustInd >= MAX_FILE_CLUSTERS)
return -EINVAL;
/* requested operation is invalid */
if (op > 4)
return -EINVAL;
/* the pointer p_outVal is NULL when it should not be (GET / ALLOC) */
if ((op == GET || op == ALLOC) && p_outVal == NULL)
return -EINVAL;
if (op == CLEAN) {
// if operation is CLEAN, readInode as Free in Dirty State
if ((stat = soReadInode(&inode, nInode, FDIN)) != 0)
return stat;
} else {
// for all other operations read inode as inode in use
if ((stat = soReadInode(&inode, nInode, IUIN)) != 0)
return stat;
}
/* END OF VALIDATION */
if (clustInd < N_DIRECT) {
// flow trough direct references
if ((stat = soHandleDirect(p_sb, nInode, &inode, clustInd, op, p_outVal)) != 0)
return stat;
} else if (clustInd < N_DIRECT + RPC) {
// flow trough single indirect references
if ((stat = soHandleSIndirect(p_sb, nInode, &inode, clustInd, op, p_outVal)) != 0)
return stat;
} else {
// flow trough double indirect references
if ((stat = soHandleDIndirect(p_sb, nInode, &inode, clustInd, op, p_outVal)) != 0)
return stat;
}
//printf("clucountPrincipal = %u\n", inode.cluCount);
if (op == CLEAN) {
if ((stat = soWriteInode(&inode, nInode, FDIN)) != 0)
return stat;
} else if (op != GET) {
if ((stat = soWriteInode(&inode, nInode, IUIN)) != 0)
return stat;
}
return 0;
}
int soRenameDirEntry (uint32_t nInodeDir, const char *oldName, const char *newName)
{
soColorProbe (315, "07;31", "soRenameDirEntry (%"PRIu32", \"%s\", \"%s\")\n", nInodeDir, oldName, newName);
SOSuperBlock *p_sb;
SOInode inode;
SODataClust dirClust;
int size;
int stat;
uint32_t p_idx;
//uint32_t p_nInodeEnt;
// obter informação do superbloco
if((stat=soLoadSuperBlock())!=0)
{
return stat;
}
// ponteiro para o superblock
p_sb=soGetSuperBlock();
// verificação de validade do iNode
if(nInodeDir>=p_sb->iTotal || nInodeDir < 0)
{
return -EINVAL;
}
if (oldName == NULL || newName == NULL)
{
return -EINVAL;
}
// check ao tamanho do nome antigo
size = strlen(oldName);
if(size > (MAX_NAME))
{
return -ENAMETOOLONG;
}
// check ao tamanho do novo nome
size = strlen(newName);
if(size > (MAX_NAME))
{
return -ENAMETOOLONG;
}
/* verificaçã odas string, estas nao podem
conter '/' no seu conteudo
char test;
test=strchr(&newName,'/');
if(test != NULL)
{
return -EINVAL;
}
test=strchr(&oldName,'/');
{
return -EINVAL
}
esta verificação e feita pela funçao pela soGetEntryByName
*/
// leitura do inode
if ((stat=soReadInode(&inode,nInodeDir,IUIN))!=0)
{
return stat;
}
if((stat=soQCheckInodeIU(p_sb,&inode))!=0)
{
return stat;
}
// verificação de permissoes de execução
if((stat=soAccessGranted(nInodeDir,X))!=0)
{
return -EACCES;
}
// verificação de permissoes de escrita
if((stat=soAccessGranted(nInodeDir,W))!=0)
{
return -EPERM;
}
// verificação se o inodeDir e um directorio
if((inode.mode & INODE_DIR)!= INODE_DIR)
{
return -ENOTDIR;
}
/*if((stat=soQCheckDirCont(p_sb,&inode))!=0)
{
return stat;
}
perror("antesQcheck");*/
//verificação se o novo nome a alterar existe
if((stat=soGetDirEntryByName(nInodeDir,oldName,NULL,&p_idx))!= 0){
return stat;
}
if((stat=soGetDirEntryByName(nInodeDir,newName,NULL,NULL)) == 0){
return -EEXIST;
}
/*if(stat != 0)
{
return stat;
}*/
/* vamos carregar o cluster que possui a entrada de directorio que pretendemos renomear*/
if((stat=soReadFileCluster(nInodeDir,p_idx/DPC, &dirClust))!=0)
{
return stat;
}
// copiar nova string para a entrada onde se encontrava o oldName
//memcpy((char*)dirClust.info.de[p_idx%DPC].name,(char*)newName,MAX_NAME+1);
int i = 0;
for(i=0;i < MAX_NAME+1;i++)
{
dirClust.info.de[p_idx%DPC].name[i]=0;
}
strcpy((char*)dirClust.info.de[p_idx%DPC].name,(char*)newName);
if((stat=soWriteFileCluster(nInodeDir,p_idx/DPC, &dirClust))!=0)
{
return stat;
}
return 0;
}
/**
* \brief Get an entry by path.
*
* The directory hierarchy of the file system is traversed to find an entry whose name is the rightmost component of
* <tt>ePath</tt>. The path is supposed to be absolute and each component of <tt>ePath</tt>, with the exception of the
* rightmost one, should be a directory name or symbolic link name to a path.
*
* The process that calls the operation must have execution (x) permission on all the components of the path with
* exception of the rightmost one.
*
* \param ePath pointer to the string holding the name of the path
* \param p_nInodeDir pointer to the location where the number of the inode associated to the directory that holds the
* entry is to be stored
* (nothing is stored if \c NULL)
* \param p_nInodeEnt pointer to the location where the number of the inode associated to the entry is to be stored
* (nothing is stored if \c NULL)
*
* \return <tt>0 (zero)</tt>, on success
* \return -\c EINVAL, if the pointer to the string is \c NULL or the path string does not describe an absolute path
* \return -\c ENAMETOOLONG, if the path or any of the path components exceed the maximum allowed length
* \return -\c ERELPATH, if the path is relative and it is not a symbolic link
* \return -\c ENOTDIR, if any of the components of <tt>ePath</tt>, but the last one, is not a directory
* \return -\c ELOOP, if the path resolves to more than one symbolic link
* \return -\c ENOENT, if no entry with a name equal to any of the components of <tt>ePath</tt> is found
* \return -\c EACCES, if the process that calls the operation has not execution permission on any of the components
* of <tt>ePath</tt>, but the last one
* \return -\c EDIRINVAL, if the directory is inconsistent
* \return -\c EDEINVAL, if the directory entry is inconsistent
* \return -\c EIUININVAL, if the inode in use is inconsistent
* \return -\c ELDCININVAL, if the list of data cluster references belonging to an inode is inconsistent
* \return -\c EDCINVAL, if the data cluster header is inconsistent
* \return -\c ELIBBAD, if some kind of inconsistency was detected at some internal storage lower level
* \return -<em>other specific error</em> issued by \e lseek system call
*/
int soGetDirEntryByPath (const char *ePath, uint32_t *p_nInodeDir, uint32_t *p_nInodeEnt)
{
soProbe (111, "soGetDirEntryByPath (\"%s\", %p, %p)\n", ePath, p_nInodeDir, p_nInodeEnt);
printf("\nePath = %s\n", ePath);
/** Variables **/
int error;
char absPath[1];
char auxPath[MAX_PATH + 1];
char dirPath[MAX_PATH + 1];
char basePath[MAX_NAME + 1];
uint32_t nInodeDir;
uint32_t nInodeEnt;
SOSuperBlock *sb;
/** Parameter check **/
if(ePath == NULL)
return -EINVAL;
/** Conformity check **/
if(strlen(ePath) > MAX_PATH + 1)
return -ENAMETOOLONG;
/** Check if ePath is an absolute path **/
absPath[0] = '/';
if(ePath[0] != absPath[0])
return -ERELPATH;
/** Get basename and dirname of ePath **/
strcpy((char *)auxPath, ePath);
strcpy(dirPath, dirname(auxPath));
strcpy((char *)auxPath, ePath);
strcpy(basePath, basename(auxPath));
/** Loading SuperBlock **/
if((error = soLoadSuperBlock()) != 0)
return error;
if((sb = soGetSuperBlock()) == NULL)
return -EBADF;
/** Get parent directory inode number **/
if((error = soTraversePath(sb, dirPath, NULL, &nInodeDir)) != 0)
return error;
/** Get entry inode number **/
/*if((error = soGetDirEntryByName_bin(nInodeDir, basePath, &nInodeEnt, NULL)) != 0)
return error;*/
/*Get entry inode number*/
if(strcmp(basePath, "/") != 0){
if((error = soGetDirEntryByName(nInodeDir, basePath, &nInodeEnt, NULL)) != 0)
return error;
}
/*Entry directory of root direcrory is "."*/
else if((error = soGetDirEntryByName(nInodeDir, ".", &nInodeEnt, NULL)) != 0)
return error;
/** Update return values **/
if(p_nInodeDir != NULL)
*p_nInodeDir = nInodeDir;
if(p_nInodeEnt != NULL)
*p_nInodeEnt = nInodeEnt;
/** Operation successful **/
return 0;
}
int soHandleFileClusters (uint32_t nInode, uint32_t clustIndIn, uint32_t op)
{
soColorProbe (414, "07;31", "soHandleFileClusters (%"PRIu32", %"PRIu32", %"PRIu32")\n", nInode, clustIndIn, op);
SOSuperBlock* p_sb;
SOInode inode;
SODataClust *clust1, *clust2;
uint32_t stat, ind, ref_offset, ref_Soffset, ref_Doffset;
if((stat = soLoadSuperBlock())){
return stat;
}
p_sb = soGetSuperBlock();
if(nInode < 0 || nInode >= p_sb->iTotal){
return -EINVAL;
}
if(clustIndIn >= MAX_FILE_CLUSTERS){
return -EINVAL;
}
if(op < 2 || op > 4){
return -EINVAL;
}
if(op == CLEAN){
if ((stat=soReadInode(&inode,nInode,FDIN))!=0){
return stat;
}
}else{
if ((stat=soReadInode(&inode,nInode,IUIN))!=0){
return stat;
}
}
/*Referencas Duplamente Indirectas*/
if(inode.i2 != NULL_CLUSTER){
if ((stat = soLoadSngIndRefClust((inode.i2 * BLOCKS_PER_CLUSTER) + p_sb->dZoneStart)) != 0){
return stat;
}
clust2 = soGetSngIndRefClust();
ind = N_DIRECT + RPC; //tamanho da tabela das referencias simplesmentre indirectas
for(;inode.i2 != NULL_CLUSTER && ind < MAX_FILE_CLUSTERS;){
ref_Soffset = (ind - (RPC + N_DIRECT)) / RPC;
ref_Doffset = (ind - N_DIRECT - RPC) % RPC;
if(clust2->info.ref[ref_Soffset] != NULL_CLUSTER){
if((stat = soLoadDirRefClust((clust2->info.ref[ref_Soffset]* BLOCKS_PER_CLUSTER) + p_sb->dZoneStart)) != 0){
return stat;
}
clust1 = soGetDirRefClust();
for(; ref_Doffset < RPC; ref_Doffset++, ind++){
if(clust1->info.ref[ref_Doffset] != NULL_CLUSTER && clustIndIn <= ind){
if((stat = soHandleFileCluster(nInode, ind, op, NULL)) != 0){
return stat;
}
}
}
}else{
ind += RPC;
}
}
}
/*Referencias Simplesmente Indirectas*/
if(inode.i1 != NULL_CLUSTER){
if((stat = soLoadDirRefClust((inode.i1 * BLOCKS_PER_CLUSTER) + p_sb->dZoneStart)) != 0){
return stat;
}
clust1 = soGetDirRefClust();
ind = N_DIRECT;
for(; inode.i1 != NULL_CLUSTER && ind < N_DIRECT + RPC;ind++){
ref_offset = ind - N_DIRECT;
if(clust1->info.ref[ref_offset] != NULL_CLUSTER && clustIndIn <= ind){
if((stat = soHandleFileCluster(nInode, ind, op, NULL)) != 0 ){
return stat;
}
}
}
}
/*Referencias Directas*/
ind = 0;
for(; ind < N_DIRECT; ind++){
if(inode.d[ind] != NULL_CLUSTER && clustIndIn <= ind){
if((stat = soHandleFileCluster(nInode, ind, op, NULL)) != 0){
return stat;
}
}
}
return 0;
}
int soCleanDataCluster (uint32_t nInode, uint32_t nLClust)
{
soColorProbe (415, "07;31", "soCleanDataCluster (%"PRIu32", %"PRIu32")\n", nInode, nLClust);
int stat, i, j; // stat = error stat of the function; i= auxiliary variable for iterations
SOSuperBlock *p_sb; // pointer to the super block
SOInode inode; // inode instance to clean the references
uint32_t clusterCount = 0; // physical number of the cluster
SODataClust *p_clusterS, *p_clusterD; // cluster pointers to direct and indirect references
// Load the super block
if((stat = soLoadSuperBlock()) != 0)
return stat;
//get pointer to the super block
p_sb = soGetSuperBlock();
//check if inode is in the allowed parameters
if(nInode >= p_sb->iTotal)
return -EINVAL;
//check if nLClust is in allowed parameters
if (!(nLClust > 0 && nLClust < p_sb->dZoneTotal))
return -EINVAL;
//read nInode data into inode
if((stat = soReadInode(&inode, nInode, FDIN)) != 0)
return stat;
//Direct References
for(i = 0; i < N_DIRECT; i++){
if(inode.d[i] != NULL_CLUSTER){
if(inode.d[i] == nLClust){
//if cluster is in d[i] clean it
if((stat = soHandleFileCluster(nInode, i, CLEAN, NULL)) != 0)
return stat;
return 0;
}
else
clusterCount++;
}
//if we parsed all the clusters in the inode and it's not found
if(clusterCount == inode.cluCount)
return -EDCINVAL;
}
//Direct References Cluster
//if nLClust is i1
if(inode.i1 == nLClust){
if ((stat = soLoadDirRefClust(p_sb->dZoneStart + inode.i1 * BLOCKS_PER_CLUSTER)) != 0)
return stat;
p_clusterS = soGetDirRefClust();
//clean all references in i1
for(i = 0; i < RPC; i++){
if(p_clusterS->info.ref[i-N_DIRECT] != NULL_CLUSTER){
if((stat = soHandleFileCluster(nInode, i + N_DIRECT, CLEAN, NULL)) != 0)
return stat;
}
}
return 0;
}
//if nLClust is not i1 it can be any of the RPC
else{
if((stat = soLoadDirRefClust(p_sb->dZoneStart + inode.i1 * BLOCKS_PER_CLUSTER)) != 0)
return stat;
p_clusterS = soGetDirRefClust();
for(i = 0; i < RPC; i++){
if(p_clusterS->info.ref[i] != NULL_CLUSTER){
//if nLCuster is found clean it
if(p_clusterS->info.ref[i] == nLClust){
if((stat = soHandleFileCluster(nInode, i + N_DIRECT, CLEAN, NULL)) != 0)
return stat;
return 0;
}
else
clusterCount++;
}
//if we parsed all the clusters in the inode and it's not found
if(clusterCount == inode.cluCount)
return -EDCINVAL;
}
}
//Referencias duplamente indirectas
//if nLClust is i2
if(inode.i2 == nLClust){
if ((stat = soLoadSngIndRefClust(p_sb->dZoneStart + inode.i2 * BLOCKS_PER_CLUSTER)) != 0)
return stat;
p_clusterS = soGetSngIndRefClust();
//clean all clusters in indirect and direct references
for(i = 0; i < RPC; i++){
if(p_clusterS->info.ref[i] != NULL_CLUSTER){
if ((stat = soLoadDirRefClust(p_sb->dZoneStart + p_clusterS->info.ref[i] * BLOCKS_PER_CLUSTER)) != 0)
return stat;
p_clusterD = soGetDirRefClust();
for(j = 0; j < RPC; j++){
if(p_clusterD->info.ref[j] != NULL_CLUSTER)
if((stat = soHandleFileCluster(nInode, N_DIRECT + (RPC*(i+1)) + j, CLEAN, NULL)) != 0)
return stat;
}
}
}
return 0;
}
//if nLClust is not i2
else{
if ((stat = soLoadSngIndRefClust(p_sb->dZoneStart + inode.i2 * BLOCKS_PER_CLUSTER)) != 0)
return stat;
p_clusterS = soGetSngIndRefClust();
//parse i2 references
for(i = 0; i < RPC; i++){
if(p_clusterS->info.ref[i] != NULL_CLUSTER){
//if nLClust is in direct references
if(p_clusterS->info.ref[i] == nLClust){
if ((stat = soLoadDirRefClust(p_sb->dZoneStart + p_clusterS->info.ref[i] * BLOCKS_PER_CLUSTER)) != 0)
return stat;
p_clusterD = soGetDirRefClust();
//clean all indirect references for the direct reference entry
for(j = 0; j < RPC; j++){
if(p_clusterD->info.ref[j] != NULL_CLUSTER)
if((stat = soHandleFileCluster(nInode, N_DIRECT + (RPC*(i+1)) + j, CLEAN, NULL)) != 0)
return stat;
}
}
//if it's not in the direct references, let's look in all the indirect
else{
if ((stat = soLoadDirRefClust(p_sb->dZoneStart + p_clusterS->info.ref[i] * BLOCKS_PER_CLUSTER)) != 0)
return stat;
p_clusterD = soGetDirRefClust();
//search all the indirect references for each of the direct references
for(j = 0; j < RPC; j++){
if(p_clusterD->info.ref[j] != NULL_CLUSTER){
//if nLCluster is found clean it
if(p_clusterD->info.ref[j] == nLClust){
if((stat = soHandleFileCluster(nInode, N_DIRECT + (RPC*(i+1)) + j, CLEAN, NULL)) != 0)
return stat;
return 0;
}
else
clusterCount++;
}
if(clusterCount == inode.cluCount)
return -EDCINVAL;
}
clusterCount++;
}
//if we parsed all the clusters in the inode and it's not found
if(clusterCount == inode.cluCount)
return -EDCINVAL;
}
}
}
return 0;
}