/*
* 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;
}
// 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;
}