Exemplo n.º 1
0
/*
 * sfs_create_inode - alloc a inode in memroy, and init din/ino/dirty/reclian_count/sem fields in sfs_inode in inode
 */
static int
sfs_create_inode(struct sfs_fs *sfs, struct sfs_disk_inode *din, uint32_t ino, struct inode **node_store) {
    struct inode *node;
    if ((node = alloc_inode(sfs_inode)) != NULL) {
        vop_init(node, sfs_get_ops(din->type), info2fs(sfs, sfs));
        struct sfs_inode *sin = vop_info(node, sfs_inode);
        sin->din = din, sin->ino = ino, sin->dirty = 0, sin->reclaim_count = 1;
        sem_init(&(sin->sem), 1);
        *node_store = node;
        return 0;
    }
    return -E_NO_MEM;
}
Exemplo n.º 2
0
// Find the inode with number inum on device dev
// and return the in-memory copy. Does not lock
// the inode and does not read it from disk.
struct inode*
sfs_iget(uint dev, uint inum, short type)
{
  struct inode *ip, *empty;
  struct sfs_inode *sip;
//  struct buf *bp;
//  struct sfs_dinode *dip;
  
  acquire(&icache.lock);

  // Is the inode already cached?
  empty = 0;
  for(ip = &icache.inode[0]; ip < &icache.inode[NINODE]; ip++){
    sip = vop_info(ip, sfs_inode);
 //   cprintf("IGET: fstype = %d, ref = %d, dev = %d, inum = %d\n", ip->fstype, sip->ref, sip->dev, sip->inum);
    if(ip->fstype == SFS_INODE && sip->ref > 0 && sip->dev == dev && sip->inum == inum){
      sip->ref++;
      release(&icache.lock);
      return ip;
    }
    if(empty == 0 && sip->ref == 0)    // Remember empty slot.
      empty = ip;
  }
  // Recycle an inode cache entry.
  if(empty == 0)
    panic("iget: no inodes");
//  cprintf("inum1 = %d\n", inum);
  ip = empty;
  sip = vop_info(ip, sfs_inode);
//  cprintf("inum2 = %d\n", inum);
  sip->dev = dev;
  sip->inum = inum;
  sip->ref = 1;
  sip->flags = 0;
  release(&icache.lock);
  if(type != 0){
    sip->type = type;
  }else{
 //   bp = bread(dev, IBLOCK(inum));
 //   dip = (struct sfs_dinode*)bp->data + inum%IPB;
 //   sip->type = dip->type;
 //   brelse(bp);
    sfs_ilock(ip);
    sfs_iunlock(ip);
  }
//  cprintf("tip type = %d, major = %d, minor = %d, nlink = %d, inum = %d\n", sip -> type, sip->major,sip->minor,sip->nlink, sip->inum);
//  cprintf("inum3 = %d\n", inum);
  vop_init(ip, sfs_get_ops(sip->type), SFS_INODE);
//  cprintf("inum4 = %d\n", inum);
  return ip;
}