#include <stdio.h>

#include "filesys.h"

static struct dinode block_buf[BLOCKSIZ/DINODESIZ];

struct inode *ialloc()   /*  ialloc  */

{

   struct inode *temp_inode;

   unsigned int cur_di;

   int i,count,block_end_flag;

  

   if(filsys.s_pinode==NICINOD)    /*  s_inode empty  */

   {

      i=0;

      count=0;

      block_end_flag=1;

      filsys.s_pinode=NICINOD-1;

      cur_di=filsys.s_rinode;

      while((count<NICINOD) || (count<=filsys.s_ninode))

      {

       if(block_end_flag)

        {

            fseek(fd,DINODESTART+cur_di*DINODESIZ,SEEK_SET);

            fread(block_buf,1,BLOCKSIZ,fd);

            block_end_flag=0;

            i=0;

        }  

       while(block_buf[i].di_mode==DIEMPTY)

        {

            cur_di++;

            i++;

        }

       if(i==NICINOD)

           block_end_flag=1;

        else

        {

            filsys.s_inode[filsys.s_pinode--]=cur_di;

            count++;

        }

     }

     filsys.s_rinode=cur_di;

   }

   temp_inode=iget(filsys.s_inode[filsys.s_pinode]);

   fseek(fd, DINODESTART+filsys.s_inode[filsys.s_pinode]*DINODESIZ, SEEK_SET);

   fwrite(&temp_inode->di_number,1,sizeof(struct dinode),fd);

   filsys.s_pinode++;

   filsys.s_ninode--;

   filsys.s_fmod=SUPDATE;

   return temp_inode;

 }

  

ifree(dinodeid)    /*  ifree  */

unsigned dinodeid;

{

   filsys.s_ninode++;

   if(filsys.s_pinode!=NICINOD)    /* not full  */

   {

       filsys.s_inode[filsys.s_pinode]=dinodeid;

       filsys.s_pinode++;

   }

   else  /*full */

   {

       if(dinodeid<filsys.s_rinode)

   {

       filsys.s_inode[NICINOD]=dinodeid;

       filsys.s_rinode=dinodeid;

    }

   }

}