char* readPage(int absolutePageNumber) {
retardo();
int page_size = getSwapPagesSize();
char *file_name = getSwapFileName();
FILE *fp = fopen(file_name, "r");
char* page = malloc(sizeof(char) * page_size);
int position = absolutePageNumber * page_size;
fseek(fp, position, SEEK_SET);
fgets(page, page_size + 1, fp);
return page;
}
void
swapOut(struct proc* p)
{
//write to file
char filename[9];
struct file* f;
uint i;
pte_t* pte=0;
getSwapFileName(p, filename);
//cprintf("swapout %s %d\n", p->name, p->pid);
//release(&inswapper_lk);
//acquire(&inswapper_lk);
release(&ptable.lock);
f = openKernelFile(filename, O_CREATE | O_WRONLY);
acquire(&ptable.lock);
//cprintf("sfff\n");
//release(&inswapper_lk);
if(f == 0)
panic("swapout: file open error\n");
//cprintf("swapout: before write\n");
int freed = 0;
for (i = 0; i < p->sz; i += PGSIZE) {
if (!(pte = walkpgdir(p->pgdir, (void *) i, 0)))
panic("swapout: pte should exist\n");
//cprintf("walkpgdir: ok\n");
if (!(*pte & PTE_P))
panic("swapout: page not present\n");
if((*pte & PTE_SHR) || !(*pte & PTE_U))
continue;
char *addr=(char*)p2v(PTE_ADDR(*pte));
//acquire(&inswapper_lk);
release(&ptable.lock);
filewrite(f, addr, PGSIZE);
acquire(&ptable.lock);
// release(&inswapper_lk);
//cprintf("(w=%s)", addr);
kfree(addr);
*pte = 0;
freed++;
//cprintf("swapout: wrote %d\n",i/PGSIZE);
}
//cprintf("swapout freed %d\n", freed);
//kfree((char*) p->pgdir);
//cprintf("swapout: after write\n");
//freevm(p->pgdir);
// acquire(&inswapper_lk);
release(&ptable.lock);
fileclose(f);
acquire(&ptable.lock);
// release(&inswapper_lk);
}
void
swapIn(struct proc* p)
{
//read from file
char filename[9];
struct file* f;
uint i;
char* buff;
pte_t* pte;
//cprintf("swapin %s %d\n", p->name, p->pid);
getSwapFileName(p, filename);
release(&ptable.lock);
f = openKernelFile(filename, O_RDWR);
//cprintf("1");
acquire(&ptable.lock);
if(f == 0)
panic("swapin: file open error\n");
f->off = 0;
//p->pgdir = setupkvm();
if (!p->pgdir)
panic("swapin: setupkvm failed\n");
int recovered = 0;
for (i = 0; i < p->sz; i += PGSIZE) {
if((pte = walkpgdir(p->pgdir, (char*) i, 0)) == 0){
//cprintf("skip");
//continue;
}
if(*pte != 0)
continue;
if (!(buff = kalloc()))
panic("swapin: kalloc failed\n");
release(&ptable.lock);
fileread(f, buff, PGSIZE);
acquire(&ptable.lock);
//cprintf("(%s)", buff);
if (mappages(p->pgdir, (void*) i, PGSIZE, v2p(buff), PTE_W | PTE_U) < 0)
panic("swapin: mappages failed\n");
recovered++;
}
//cprintf("swapin recovered %d\n", recovered);
release(&ptable.lock);
fileclose(f);
//cprintf("swapin2");
//unlinkKernelFile(filename);
acquire(&ptable.lock);
//cprintf("swapin3");
}
void setupSwap() {
//Traigo datos del archivo de configuracion de Swap y creo un archivo
//con las especificaciones de configuracion con /0
log_swap = log_create("/tp-2015-2c-signiorcodigo/swap/log_swap", "SWAP",
true, LOG_LEVEL_INFO);
int pages_amount = getSwapPagesAmount();
int page_size = getSwapPagesSize();
char *file_name = getSwapFileName();
char command[100];
int total = pages_amount * page_size;
remove(file_name);
sprintf(command, "dd if=/dev/zero of=%s bs=%d count=1", file_name, total);
system(command);
//printf("Archivo de swap creado bajo el nombre %s\n",file_name );
}
void writePage(int absolutePageNumber, char *content) {
retardo();
int page_size = getSwapPagesSize();
char *file_name = getSwapFileName();
FILE *fp = fopen(file_name, "rb+");
int position = absolutePageNumber * page_size;
fseek(fp, position, SEEK_SET);
fwrite(content, sizeof(char), strlen(content), fp);
fclose(fp);
}
