# /* * Copyright 1973 Bell Telephone Laboratories Inc */ #include "../param.h" #include "../systm.h" #include "../user.h" #include "../inode.h" #include "../filsys.h" #include "../conf.h" #include "../buf.h" struct inode *maxip; iget(dev, ino) int dev; int ino; { register struct inode *p; register *ip2; int *ip1; register struct mount *ip; loop: ip = NULL; for(p = &inode[0]; p < &inode[NINODE]; p++) { if(dev==p->i_dev && ino==p->i_number) { if((p->i_flag&ILOCK) != 0) { p->i_flag =| IWANT; sleep(p, PINOD); goto loop; } if((p->i_flag&IMOUNT) != 0) { for(ip = &mount[0]; ip < &mount[NMOUNT]; ip++) if(ip->m_inodp == p) { dev = ip->m_dev; ino = ROOTINO; goto loop; } panic("no imt"); } p->i_count++; p->i_flag =| ILOCK; return(p); } if(ip==NULL && p->i_count==0) ip = p; } if((p=ip) == NULL) panic("no inodes"); if (p>maxip) maxip = p; p->i_dev = dev; p->i_number = ino; p->i_flag = ILOCK; p->i_count++; p->i_lastr = -1; ip = bread(dev, ldiv(ino+31,16)); ip1 = ip->b_addr + 32*lrem(ino+31, 16); ip2 = &p->i_mode; while(ip2 < &p->i_addr[8]) *ip2++ = *ip1++; brelse(ip); return(p); } iput(p) struct inode *p; { register *rp; rp = p; if(rp->i_count == 1) { rp->i_flag =| ILOCK; if(rp->i_nlink <= 0) { itrunc(rp); rp->i_mode = 0; ifree(rp->i_dev, rp->i_number); } iupdat(rp, time); prele(rp); rp->i_flag = 0; rp->i_number = 0; } rp->i_count--; prele(rp); } iupdat(p, tm) int *p; int *tm; { register *ip1, *ip2, *rp; int *bp, i; rp = p; if((rp->i_flag&(IUPD|IACC)) != 0) { if(getfs(rp->i_dev)->s_ronly) return; i = rp->i_number+31; bp = bread(rp->i_dev, ldiv(i,16)); ip1 = bp->b_addr + 32*lrem(i, 16); ip2 = &rp->i_mode; while(ip2 < &rp->i_addr[8]) *ip1++ = *ip2++; if(rp->i_flag&IACC) { *ip1++ = time[0]; *ip1++ = time[1]; } else ip1 =+ 2; if(rp->i_flag&IUPD) { *ip1++ = *tm++; *ip1++ = *tm; } bwrite(bp); } } itrunc(ip) int *ip; { register *rp, *bp, *cp; rp = ip; if((rp->i_mode&(IFCHR&IFBLK)) != 0) return; for(ip = &rp->i_addr[0]; ip < &rp->i_addr[8]; ip++) if(*ip) { if((rp->i_mode&ILARG) != 0) { bp = bread(rp->i_dev, *ip); for(cp = bp->b_addr; cp < bp->b_addr+512; cp++) if(*cp) free(rp->i_dev, *cp); brelse(bp); } free(rp->i_dev, *ip); *ip = 0; } rp->i_mode =& ~ILARG; rp->i_size0 = 0; rp->i_size1 = 0; rp->i_flag =| IUPD; } maknode(mode) { register *ip; ip = ialloc(u.u_pdir->i_dev); ip->i_flag =| IACC|IUPD; ip->i_mode = mode|IALLOC; ip->i_nlink = 1; ip->i_uid = u.u_uid; ip->i_gid = u.u_gid; wdir(ip); return(ip); } wdir(ip) int *ip; { register char *cp1, *cp2; u.u_dent.u_ino = ip->i_number; cp1 = &u.u_dent.u_name[0]; for(cp2 = &u.u_dbuf[0]; cp2 < &u.u_dbuf[DIRSIZ];) *cp1++ = *cp2++; u.u_count = DIRSIZ+2; u.u_segflg = 1; u.u_base = &u.u_dent; writei(u.u_pdir); iput(u.u_pdir); }