// Superbloc
void init_super(uint vol, char *nom) {
// read_bloc_n(vol, 0, (uchar *) &superbloc, sizeof(struct superbloc_s));
load_super(vol);
if(superbloc.magic == MAGIC_SUPERBLOC){
printf("Wait, superbloc already initialized :)\n");
exit(EXIT_FAILURE);
}
else {
superbloc.magic = MAGIC_SUPERBLOC;
strcpy(superbloc.nom, nom);
superbloc.first_free_bloc = 1;
superbloc.root = 0;
superbloc.nb_free = mbr.vol[vol].nb_bloc-1;
int i = 0;
for(i = 1; i<mbr.vol[vol].nb_bloc; i++) {
struct free_bloc_s fb;
if(i == mbr.vol[vol].nb_bloc-1)
fb.next_free_bloc = 0;
else fb.next_free_bloc = i+1;
write_bloc_n(vol, i, (uchar *) &fb, sizeof(struct free_bloc_s));
}
save_super();
}
}
void
umount()
{
/* save current volume super bloc */
save_super();
/* bye */
}
int main(int argc, char **argv) {
uint volume;
init_hard();
if(argc < 2){
printf("exe: ./create_bloc volume\n");
printf("On which volume: ");
scanf("%d", &volume);
} else {
volume = atoi(argv[1]);
}
assert(volume < MAX_VOL);
if(load_mbr() == 1){
printf("Okay, partition ready to be use\n");
} else {
printf("Partition not initialized.. Now it is !");
}
info_on_volume_to_display(volume);
if(load_super(volume) == 1){
printf("Okay, superbloc of volume n°%d loaded\n", volume);
} else {
printf("Superbloc not initialized.. :(\n");
}
while (superbloc.nb_free != 0) {
printf("New bloc: %d\n", new_bloc());
}
printf("There is no more freebloc available... :(\n");
while (mbr.vol[volume].nb_bloc-1 != superbloc.nb_free) {
printf("free_bloc(%d)\n", (mbr.vol[volume].nb_bloc-1) - superbloc.nb_free);
free_bloc((mbr.vol[volume].nb_bloc-1) - superbloc.nb_free);
}
save_super();
save_mbr();
printf("All blocs are now available and free. :)\n");
info_on_volume_to_display(volume);
return 0;
}
/* ^
* / \
* / | \
* / | \
* /___°___\
*
*
* Attention, il n'y a pas de verification, on peut free deux fois le même block, augmentant la taille libre et modifiant notre liste chaîné.
*/
void free_block(int vol, unsigned int block){
struct free_block_s fb;
fb.next = super_block.first_free;
write_n_block(vol, block, sizeof(struct free_block_s), (unsigned char*)&fb);
super_block.first_free = block;
super_block.free_size++;
save_super(vol);
}
unsigned int new_block(int vol){
int retValue = super_block.first_free;
struct free_block_s fb;
if ( super_block.free_size == 0 ){
return BLOCK_NULL;
}
read_n_block(vol, retValue, sizeof(struct free_block_s), (unsigned char*)&fb);
super_block.first_free = fb.next;
super_block.free_size--;
save_super(vol);
return retValue;
}
void free_bloc(unsigned int bloc) {
if(bloc==0){
printf("Impossible de libérer le bloc : bloc inexistant\n");
return;
}
struct freeBloc_s freeB;
unsigned char buffer[HDA_SECTORSIZE];
freeB.freebloc_nb_free = 1;
freeB.freebloc_next = current_super.super_first_free_bloc;
current_super.super_first_free_bloc = bloc;
current_super.super_nb_free++;
memset(buffer, 0, HDA_SECTORSIZE);
memcpy(buffer, &freeB, sizeof(struct freeBloc_s));
write_bloc(current_vol, bloc, buffer);
save_super();
}
void init_super(unsigned int vol)
{
printf("Initialisation du superbloc du volume ...\n");
struct volume_s volume;
struct freeBloc_s fb;
unsigned char buffer[HDA_SECTORSIZE];
//load_mbr();
volume = mbr.disque[vol];
current_super.super_magic = SUPER_MAGIC;
current_super.super_first_free_bloc = 1;
current_super.super_nb_free = volume.size - 1;
//strncpy(current_super.super_name, nom, 32);
fb.freebloc_nb_free=volume.size - 1;
fb.freebloc_next=0;
save_super();
memset(buffer, 0, HDA_SECTORSIZE);
memcpy(buffer, &fb, sizeof(struct freeBloc_s));
write_bloc(vol, 1, buffer);
current_vol=vol;
printf("Initialisation du superbloc du volume terminé\n");
}
unsigned int new_bloc(){
struct freeBloc_s *fb;
unsigned char buffer[HDA_SECTORSIZE];
unsigned res;
if(current_super.super_nb_free==0)
return 0;
assert(current_super.super_first_free_bloc);
read_bloc(current_vol, current_super.super_first_free_bloc, buffer);
fb = (struct freeBloc_s*) buffer;
res = current_super.super_first_free_bloc;
if(fb->freebloc_nb_free > 1){
current_super.super_nb_free --;
fb->freebloc_nb_free--;
write_bloc(current_vol, current_super.super_first_free_bloc, buffer);
}
else
{
current_super.super_first_free_bloc = fb->freebloc_next;
}
//current_super.super_first_free_bloc--;
save_super();
return res;
}
int main(){
int vol;
int nom;
int nbblocs;
int i;
unsigned int test_serial = 0xDEADBEEF;
init_drive();
read_mbr();
dump_vols();
printf("Saisir le numero du volume:\n");
scanf("%i", &vol);
while (mbr.mbr_vol[vol].vol_nblocs == 0){
printf("Veuillez saisir un numero de volume valide:\n");
scanf("%i", &vol);
}
printf("Saisir le nom:\n");
scanf("%i", &nom);
init_super(vol, nom, test_serial);
printf("Saisir le nombre de blocs:\n");
scanf("%i", &nbblocs);
for (i=0; i<nbblocs; i++){
new_bloc();
}
save_super();
if (nbblocs > mbr.mbr_vol[vol].vol_nblocs-1){
nbblocs = mbr.mbr_vol[vol].vol_nblocs-1;
}
printf("Superbloc rempli de %d blocs !\n", nbblocs);
printf("Taux d'occupation : %f/100\n", used_percents(vol));
return 0;
}
int main(int argc, char** argv){
int v, first_cylinder, first_sector, n_block;
unsigned int i;
/* init hardware */
if(init_hardware("hardware.ini") == 0) {
fprintf(stderr, "Error in hardware initialization\n");
exit(EXIT_FAILURE);
}
/* Interreupt handlers */
for(i=0; i<16; i++) {
IRQVECTOR[i] = empty_it;
}
/* Allows all IT */
_mask(1);
if ( argc < 5 ){
printf("Usage : mkvol vol_name first_cylinder first_sector nb_block [-tother, -tannexe]\n");
return EXIT_FAILURE;
}
first_cylinder = atoi(argv[2]);
first_sector = atoi(argv[3]);
n_block = atoi(argv[4]);
if ( atoi(argv[2])==0 && atoi(argv[3])==0 ){
printf("Cannot create volume at Master Boot Record position.\n");
return EXIT_FAILURE;
}
printf("Loading Master Boot Record...\n");
load_mbr();
if ( mbr.n_vol >= MAX_VOL ){
printf("Hard drive already has 8 volumes, please delete at least one volume before creating new one.\n");
return EXIT_FAILURE;
}
first_cylinder = atoi(argv[2]);
check_before_create(atoi(argv[2]), atoi(argv[3]), atoi(argv[4]));
v = mbr.n_vol;
mbr.vol[v].first_cylinder = first_cylinder;
mbr.vol[v].first_sector = first_sector;
mbr.vol[v].n_block = n_block;
printf("Creating volume %d...\n", v);
mbr.vol[v].type = BASE;
if ( argc == 5 ){
if ( strcmp(argv[4], "-tother") == 0){
mbr.vol[v].type = OTHER;
}
if ( strcmp(argv[4], "-tannexe") == 0){
mbr.vol[v].type = ANNEXE;
}
}
srand((unsigned)time(NULL));
init_super(v, argv[1], rand(), n_block);
mbr.n_vol++;
save_mbr();
save_super(v);
printf("Volume %d created.\n", v);
return EXIT_SUCCESS;
}