- geterror(bp);
-}
-
-/*
- * Release the buffer, marking it so that if it is grabbed
- * for another purpose it will be written out before being
- * given up (e.g. when writing a partial block where it is
- * assumed that another write for the same block will soon follow).
- * This can't be done for magtape, since writes must be done
- * in the same order as requested.
- */
-bdwrite(bp)
-register struct buf *bp;
-{
- register int flags;
-
- if ((bp->b_flags&B_DELWRI) == 0)
- u.u_vm.vm_oublk++; /* noone paid yet */
- flags = bdevsw[major(bp->b_dev)].d_flags;
- if(flags & B_TAPE)
- bawrite(bp);
- else {
- bp->b_flags |= B_DELWRI | B_DONE;
- brelse(bp);
- }
-}
-
-/*
- * Release the buffer, start I/O on it, but don't wait for completion.
- */
-bawrite(bp)
-register struct buf *bp;
-{
-
- bp->b_flags |= B_ASYNC;
- bwrite(bp);
-}
-
-/*
- * release the buffer, with no I/O implied.
- */
-brelse(bp)
-register struct buf *bp;
-{
- register struct buf *flist;
- register s;
-
- if (bp->b_flags&B_WANTED)
- wakeup((caddr_t)bp);
- if (bfreelist[0].b_flags&B_WANTED) {
- bfreelist[0].b_flags &= ~B_WANTED;
- wakeup((caddr_t)bfreelist);
- }
- if (bp->b_flags&B_ERROR)
- if (bp->b_flags & B_LOCKED)
- bp->b_flags &= ~B_ERROR; /* try again later */
- else
- bp->b_dev = NODEV; /* no assoc */
- s = spl6();
- if (bp->b_flags & (B_ERROR|B_INVAL)) {
- /* block has no info ... put at front of most free list */
- flist = &bfreelist[BQUEUES-1];
- flist->av_forw->av_back = bp;
- bp->av_forw = flist->av_forw;
- flist->av_forw = bp;
- bp->av_back = flist;
- } else {
- if (bp->b_flags & B_LOCKED)
- flist = &bfreelist[BQ_LOCKED];
- else if (bp->b_flags & B_AGE)
- flist = &bfreelist[BQ_AGE];
- else
- flist = &bfreelist[BQ_LRU];
- flist->av_back->av_forw = bp;
- bp->av_back = flist->av_back;
- flist->av_back = bp;
- bp->av_forw = flist;
- }
- bp->b_flags &= ~(B_WANTED|B_BUSY|B_ASYNC|B_AGE);
- splx(s);
-}
-
-/*
- * See if the block is associated with some buffer
- * (mainly to avoid getting hung up on a wait in breada)
- */
-incore(dev, blkno)
-dev_t dev;
-daddr_t blkno;
-{
- register struct buf *bp;
- register struct buf *dp;
- register int dblkno = fsbtodb(blkno);
-
- dp = BUFHASH(dev, dblkno);
- for (bp = dp->b_forw; bp != dp; bp = bp->b_forw)
- if (bp->b_blkno == dblkno && bp->b_dev == dev &&
- !(bp->b_flags & B_INVAL))
- return (1);
- return (0);
-}
-
-struct buf *
-baddr(dev, blkno)
-dev_t dev;
-daddr_t blkno;
-{
-
- if (incore(dev, blkno))
- return (bread(dev, blkno));
- return (0);
-}
-
-/*
- * Assign a buffer for the given block. If the appropriate
- * block is already associated, return it; otherwise search
- * for the oldest non-busy buffer and reassign it.
- */
-struct buf *
-getblk(dev, blkno)
-dev_t dev;
-daddr_t blkno;
-{
- register struct buf *bp, *dp, *ep;
- register int dblkno = fsbtodb(blkno);
-#ifdef DISKMON
- register int i;
-#endif
-
- if ((unsigned)blkno >= 1 << (sizeof(int)*NBBY-PGSHIFT))
- blkno = 1 << ((sizeof(int)*NBBY-PGSHIFT) + 1);
- dblkno = fsbtodb(blkno);
- dp = BUFHASH(dev, dblkno);
- loop:
- (void) spl0();
- for (bp = dp->b_forw; bp != dp; bp = bp->b_forw) {
- if (bp->b_blkno != dblkno || bp->b_dev != dev ||
- bp->b_flags&B_INVAL)
- continue;
- (void) spl6();
- if (bp->b_flags&B_BUSY) {