+ if (vq = mp->mnt_mounth)
+ vq->v_mountb = &vp->v_mountf;
+ vp->v_mountf = vq;
+ vp->v_mountb = &mp->mnt_mounth;
+ mp->mnt_mounth = vp;
+}
+
+/*
+ * Make sure all write-behind blocks associated
+ * with mount point are flushed out (from sync).
+ */
+mntflushbuf(mountp, flags)
+ struct mount *mountp;
+ int flags;
+{
+ register struct vnode *vp;
+
+ if ((mountp->mnt_flag & MNT_MPBUSY) == 0)
+ panic("mntflushbuf: not busy");
+loop:
+ for (vp = mountp->mnt_mounth; vp; vp = vp->v_mountf) {
+ if (VOP_ISLOCKED(vp))
+ continue;
+ if (vget(vp))
+ goto loop;
+ vflushbuf(vp, flags);
+ vput(vp);
+ if (vp->v_mount != mountp)
+ goto loop;
+ }
+}
+
+/*
+ * Flush all dirty buffers associated with a vnode.
+ */
+vflushbuf(vp, flags)
+ register struct vnode *vp;
+ int flags;
+{
+ register struct buf *bp;
+ struct buf *nbp;
+ int s;
+
+loop:
+ s = splbio();
+ for (bp = vp->v_dirtyblkhd; bp; bp = nbp) {
+ nbp = bp->b_blockf;
+ if ((bp->b_flags & B_BUSY))
+ continue;
+ if ((bp->b_flags & B_DELWRI) == 0)
+ panic("vflushbuf: not dirty");
+ bremfree(bp);
+ bp->b_flags |= B_BUSY;
+ splx(s);
+ /*
+ * Wait for I/O associated with indirect blocks to complete,
+ * since there is no way to quickly wait for them below.
+ * NB: This is really specific to ufs, but is done here
+ * as it is easier and quicker.
+ */
+ if (bp->b_vp == vp || (flags & B_SYNC) == 0)
+ (void) bawrite(bp);
+ else
+ (void) bwrite(bp);
+ goto loop;
+ }
+ splx(s);
+ if ((flags & B_SYNC) == 0)
+ return;
+ s = splbio();
+ while (vp->v_numoutput) {
+ vp->v_flag |= VBWAIT;
+ sleep((caddr_t)&vp->v_numoutput, PRIBIO + 1);
+ }
+ splx(s);
+ if (vp->v_dirtyblkhd) {
+ vprint("vflushbuf: dirty", vp);
+ goto loop;
+ }
+}
+
+/*
+ * Update outstanding I/O count and do wakeup if requested.
+ */
+vwakeup(bp)
+ register struct buf *bp;
+{
+ register struct vnode *vp;
+
+ bp->b_dirtyoff = bp->b_dirtyend = 0;
+ if (vp = bp->b_vp) {
+ vp->v_numoutput--;
+ if ((vp->v_flag & VBWAIT) && vp->v_numoutput <= 0) {
+ if (vp->v_numoutput < 0)
+ panic("vwakeup: neg numoutput");
+ vp->v_flag &= ~VBWAIT;
+ wakeup((caddr_t)&vp->v_numoutput);
+ }
+ }
+}
+
+/*
+ * Invalidate in core blocks belonging to closed or umounted filesystem
+ *
+ * Go through the list of vnodes associated with the file system;
+ * for each vnode invalidate any buffers that it holds. Normally
+ * this routine is preceeded by a bflush call, so that on a quiescent
+ * filesystem there will be no dirty buffers when we are done. Binval
+ * returns the count of dirty buffers when it is finished.
+ */
+mntinvalbuf(mountp)
+ struct mount *mountp;
+{
+ register struct vnode *vp;
+ int dirty = 0;
+
+ if ((mountp->mnt_flag & MNT_MPBUSY) == 0)
+ panic("mntinvalbuf: not busy");
+loop:
+ for (vp = mountp->mnt_mounth; vp; vp = vp->v_mountf) {
+ if (vget(vp))
+ goto loop;
+ dirty += vinvalbuf(vp, 1);
+ vput(vp);
+ if (vp->v_mount != mountp)
+ goto loop;
+ }
+ return (dirty);
+}
+
+/*
+ * Flush out and invalidate all buffers associated with a vnode.
+ * Called with the underlying object locked.
+ */
+vinvalbuf(vp, save)
+ register struct vnode *vp;
+ int save;
+{
+ register struct buf *bp;
+ struct buf *nbp, *blist;
+ int s, dirty = 0;
+
+ for (;;) {
+ if (blist = vp->v_dirtyblkhd)
+ /* void */;
+ else if (blist = vp->v_cleanblkhd)
+ /* void */;
+ else
+ break;
+ for (bp = blist; bp; bp = nbp) {
+ nbp = bp->b_blockf;
+ s = splbio();
+ if (bp->b_flags & B_BUSY) {
+ bp->b_flags |= B_WANTED;
+ sleep((caddr_t)bp, PRIBIO + 1);
+ splx(s);
+ break;
+ }
+ bremfree(bp);
+ bp->b_flags |= B_BUSY;
+ splx(s);
+ if (save && (bp->b_flags & B_DELWRI)) {
+ dirty++;
+ (void) bwrite(bp);
+ break;
+ }
+ if (bp->b_vp != vp)
+ reassignbuf(bp, bp->b_vp);
+ else
+ bp->b_flags |= B_INVAL;
+ brelse(bp);
+ }
+ }
+ if (vp->v_dirtyblkhd || vp->v_cleanblkhd)
+ panic("vinvalbuf: flush failed");
+ return (dirty);
+}
+
+/*
+ * Associate a buffer with a vnode.
+ */
+bgetvp(vp, bp)
+ register struct vnode *vp;
+ register struct buf *bp;
+{
+ register struct vnode *vq;
+ register struct buf *bq;
+
+ if (bp->b_vp)
+ panic("bgetvp: not free");
+ VHOLD(vp);
+ bp->b_vp = vp;
+ if (vp->v_type == VBLK || vp->v_type == VCHR)
+ bp->b_dev = vp->v_rdev;
+ else
+ bp->b_dev = NODEV;
+ /*
+ * Insert onto list for new vnode.
+ */
+ if (bq = vp->v_cleanblkhd)
+ bq->b_blockb = &bp->b_blockf;
+ bp->b_blockf = bq;
+ bp->b_blockb = &vp->v_cleanblkhd;
+ vp->v_cleanblkhd = bp;
+}
+
+/*
+ * Disassociate a buffer from a vnode.
+ */
+brelvp(bp)
+ register struct buf *bp;
+{
+ struct buf *bq;
+ struct vnode *vp;
+
+ if (bp->b_vp == (struct vnode *) 0)
+ panic("brelvp: NULL");
+ /*
+ * Delete from old vnode list, if on one.
+ */
+ if (bp->b_blockb) {
+ if (bq = bp->b_blockf)
+ bq->b_blockb = bp->b_blockb;
+ *bp->b_blockb = bq;
+ bp->b_blockf = NULL;
+ bp->b_blockb = NULL;
projects / unix-history / blobdiff