update()
{
register struct inode *ip;
register struct mount *mp;
register *bp;
if(updlock)
return;
updlock++;
for(mp = &mount[0]; mp < &mount[NMOUNT]; mp++)
if(mp->m_bufp != NULL) {
ip = mp->m_bufp->b_addr;
if(ip->s_fmod==0 || ip->s_ilock!=0 ||
ip->s_flock!=0 || ip->s_ronly!=0)
continue;
bp = getblk(mp->m_dev, 1);
ip->s_fmod = 0;
ip->s_time[0] = time[0];
ip->s_time[1] = time[1];
bcopy(ip, bp->b_addr, 256);
bwrite(bp);
}
for(ip = &inode[0]; ip < &inode[NINODE]; ip++)
if((ip->i_flag&ILOCK) == 0) {
ip->i_flag =| ILOCK;
iupdat(ip, time);
prele(ip);
}
updlock = 0;
bflush(NODEV);
}
smdate()
{
register struct inode *ip;
register int *tp;
int tbuf[2];
if ((ip = owner()) == NULL)
return;
ip->i_flag =| IUPD;
tp = &tbuf[2];
*--tp = u.u_ar0[R1];
*--tp = u.u_ar0[R0];
iupdat(ip, tp);
ip->i_flag =& ~IUPD;
iput(ip);
}
/*
* update is the internal name of
* 'sync'. It goes through the disk
* queues to initiate sandbagged I/O;
* goes through the I nodes to write
* modified nodes; and it goes through
* the mount table to initiate modified
* super blocks.
*/
void update(void) {
struct inode *ip;
struct mount *mp;
struct buf *bp;
struct filsys *fp;
if (debugUpdate) {
printf("----- update -----\n");
}
if(updlock)
return;
updlock++;
for(mp = &mount[0]; mp < &mount[NMOUNT]; mp++)
if(mp->m_bufp != NULL) {
fp = mp->m_bufp->b_un.b_filsys;
if(fp->s_fmod==0 || fp->s_ilock!=0 ||
fp->s_flock!=0 || fp->s_ronly!=0)
continue;
bp = getblk(mp->m_dev, SUPERB);
if (bp->b_flags & B_ERROR)
continue;
fp->s_fmod = 0;
fp->s_time = time;
bcopy((caddr_t)fp, bp->b_un.b_addr, BSIZE);
bwrite(bp);
}
for(ip = &inode[0]; ip < &inode[NINODE]; ip++)
if((ip->i_flag&ILOCK)==0 && ip->i_count) {
ip->i_flag |= ILOCK;
ip->i_count++;
iupdat(ip, &time, &time);
iput(ip);
}
updlock = 0;
bflush(NODEV);
}