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 soHandleDIndirect(SOSuperBlock *p_sb, uint32_t nInode, SOInode *p_inode, uint32_t clustInd, uint32_t op,
uint32_t *p_outVal) {
uint32_t ref_Soffset, ref_Doffset; // reference positions
int stat; // function return status control
SODataClust *p_dcS, *p_dcD; // pointer to single and double reference data cluster
uint32_t nclust; // pointer no cluster number
uint32_t i; // auxiliary variable for counting
uint32_t clusterref_pos; // cluster reference position
if (op > 4) return -EINVAL;
// calculate single indirect and double indirect reference position
ref_Soffset = (clustInd - N_DIRECT - RPC) / RPC;
ref_Doffset = (clustInd - N_DIRECT - RPC) % RPC;
switch (op) {
case GET:
{
if (p_inode->i2 == NULL_CLUSTER) {
*p_outVal = NULL_CLUSTER;
} else {
if ((stat = soLoadSngIndRefClust(p_sb->dZoneStart + p_inode->i2 * BLOCKS_PER_CLUSTER)) != 0)
return stat;
p_dcS = soGetSngIndRefClust();
if (p_dcS->info.ref[ref_Soffset] == NULL_CLUSTER) {
*p_outVal = NULL_CLUSTER;
} else {
if ((stat = soLoadDirRefClust(p_sb->dZoneStart + p_dcS->info.ref[ref_Soffset] * BLOCKS_PER_CLUSTER)) != 0)
return stat;
p_dcD = soGetDirRefClust();
*p_outVal = p_dcD->info.ref[ref_Doffset];
}
}
return 0;
}
case ALLOC:
{
if (p_inode->i2 == NULL_CLUSTER) {
if ((stat = soAllocDataCluster(nInode, &nclust)) != 0)
return stat;
p_inode->i2 = nclust;
p_inode->cluCount++;
if ((stat = soLoadSngIndRefClust(p_sb->dZoneStart + p_inode->i2 * BLOCKS_PER_CLUSTER)) != 0)
return stat;
p_dcS = soGetSngIndRefClust();
for (i = 0; i < RPC; i++) p_dcS->info.ref[i] = NULL_CLUSTER;
if ((stat = soStoreSngIndRefClust()) != 0)
return stat;
}
if ((stat = soLoadSngIndRefClust(p_sb->dZoneStart + p_inode->i2 * BLOCKS_PER_CLUSTER)) != 0)
return stat;
p_dcS = soGetSngIndRefClust();
if (p_dcS->info.ref[ref_Soffset] == NULL_CLUSTER) {
if ((stat = soAllocDataCluster(nInode, &nclust)) != 0)
return stat;
p_dcS->info.ref[ref_Soffset] = nclust;
p_inode->cluCount++;
if ((stat = soLoadDirRefClust(p_sb->dZoneStart + p_dcS->info.ref[ref_Soffset] * BLOCKS_PER_CLUSTER)) != 0)
return stat;
p_dcD = soGetDirRefClust();
for (i = 0; i < RPC; i++) p_dcD->info.ref[i] = NULL_CLUSTER;
}
if ((stat = soLoadDirRefClust(p_sb->dZoneStart + p_dcS->info.ref[ref_Soffset] * BLOCKS_PER_CLUSTER)) != 0)
return stat;
p_dcD = soGetDirRefClust();
if (p_dcD->info.ref[ref_Doffset] != NULL_CLUSTER) return -EDCARDYIL;
if ((stat = soAllocDataCluster(nInode, &nclust)) != 0)
return stat;
p_dcD->info.ref[ref_Doffset] = *p_outVal = nclust;
p_inode->cluCount++;
if ((stat = soAttachLogicalCluster(p_sb, nInode, clustInd, p_dcD->info.ref[ref_Doffset])) != 0)
return stat;
if ((stat = soStoreDirRefClust()) != 0)
return stat;
if ((stat = soStoreSngIndRefClust()) != 0)
return stat;
return 0;
}
case FREE:
case FREE_CLEAN:
case CLEAN:
{
if (p_inode->i2 == NULL_CLUSTER) return -EDCNOTIL;
if ((stat = soLoadSngIndRefClust(p_sb->dZoneStart + p_inode->i2 * BLOCKS_PER_CLUSTER)) != 0)
return stat;
p_dcS = soGetSngIndRefClust();
if (p_dcS->info.ref[ref_Soffset] == NULL_CLUSTER) return -EDCNOTIL;
if ((stat = soLoadDirRefClust(p_sb->dZoneStart + p_dcS->info.ref[ref_Soffset] * BLOCKS_PER_CLUSTER)) != 0)
return stat;
p_dcD = soGetDirRefClust();
if (p_dcD->info.ref[ref_Doffset] == NULL_CLUSTER) return -EDCNOTIL;
if (op != CLEAN) {
if ((stat = soFreeDataCluster(p_dcD->info.ref[ref_Doffset]) != 0))
return stat;
if (op == FREE)
return 0;
}
if ((stat = soCleanLogicalCluster(p_sb, nInode, p_dcD->info.ref[ref_Doffset])) != 0)
return stat;
p_dcD->info.ref[ref_Doffset] = NULL_CLUSTER;
p_inode->cluCount--;
for (clusterref_pos = 0; clusterref_pos < RPC; clusterref_pos++) {
if (p_dcD->info.ref[clusterref_pos] != NULL_CLUSTER) break;
}
if ((stat = soStoreDirRefClust()) != 0)
return stat;
if (clusterref_pos == RPC) {
if ((stat = soFreeDataCluster(p_dcS->info.ref[ref_Soffset])) != 0)
return stat;
if ((stat = soCleanLogicalCluster(p_sb, nInode, p_dcS->info.ref[ref_Soffset]) != 0))
return stat;
p_dcS->info.ref[ref_Soffset] = NULL_CLUSTER;
p_inode->cluCount--;
if ((stat = soStoreSngIndRefClust()) != 0)
return stat;
for (clusterref_pos = 0; clusterref_pos < RPC; clusterref_pos++) {
if (p_dcS->info.ref[clusterref_pos] != NULL_CLUSTER) break;
}
if (clusterref_pos == RPC) {
if ((stat = soFreeDataCluster(p_inode->i2)) != 0)
return stat;
if ((stat = soCleanLogicalCluster(p_sb, nInode, p_inode->i2)) != 0)
return stat;
p_inode->i2 = NULL_CLUSTER;
p_inode->cluCount--;
return 0;
}
return 0;
}
if ((stat = soStoreSngIndRefClust()) != 0)
return stat;
return 0;
}
default:
{
p_outVal = NULL;
return -EINVAL;
}
}
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;
}
