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vfs_export.c (34577) vfs_export.c (34611)
1/*
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.

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31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * @(#)vfs_subr.c 8.31 (Berkeley) 5/26/95
1/*
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.

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31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * @(#)vfs_subr.c 8.31 (Berkeley) 5/26/95
39 * $Id: vfs_subr.c,v 1.139 1998/03/14 02:55:01 tegge Exp $
39 * $Id: vfs_subr.c,v 1.140 1998/03/14 19:50:36 dyson Exp $
40 */
41
42/*
43 * External virtual filesystem routines
44 */
45#include "opt_ddb.h"
46#include "opt_devfs.h"
47

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108
109static u_long wantfreevnodes = 25;
110SYSCTL_INT(_debug, OID_AUTO, wantfreevnodes, CTLFLAG_RW, &wantfreevnodes, 0, "");
111static u_long freevnodes = 0;
112SYSCTL_INT(_debug, OID_AUTO, freevnodes, CTLFLAG_RD, &freevnodes, 0, "");
113
114int vfs_ioopt = 0;
115#ifdef REALLYBADBUG
40 */
41
42/*
43 * External virtual filesystem routines
44 */
45#include "opt_ddb.h"
46#include "opt_devfs.h"
47

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108
109static u_long wantfreevnodes = 25;
110SYSCTL_INT(_debug, OID_AUTO, wantfreevnodes, CTLFLAG_RW, &wantfreevnodes, 0, "");
111static u_long freevnodes = 0;
112SYSCTL_INT(_debug, OID_AUTO, freevnodes, CTLFLAG_RD, &freevnodes, 0, "");
113
114int vfs_ioopt = 0;
115#ifdef REALLYBADBUG
116#ifdef ENABLE_VFS_IOOPT
116SYSCTL_INT(_vfs, OID_AUTO, ioopt, CTLFLAG_RW, &vfs_ioopt, 0, "");
117#endif
117SYSCTL_INT(_vfs, OID_AUTO, ioopt, CTLFLAG_RW, &vfs_ioopt, 0, "");
118#endif
119#endif
118
119struct mntlist mountlist; /* mounted filesystem list */
120struct simplelock mountlist_slock;
121static struct simplelock mntid_slock;
122struct simplelock mntvnode_slock;
123static struct simplelock vnode_free_list_slock;
124static struct simplelock spechash_slock;
125struct nfs_public nfs_pub; /* publicly exported FS */

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626 VOP_BWRITE(bp);
627 }
628 } else {
629 (void) VOP_BWRITE(bp);
630 }
631 break;
632 }
633 bp->b_flags |= (B_INVAL|B_NOCACHE|B_RELBUF);
120
121struct mntlist mountlist; /* mounted filesystem list */
122struct simplelock mountlist_slock;
123static struct simplelock mntid_slock;
124struct simplelock mntvnode_slock;
125static struct simplelock vnode_free_list_slock;
126static struct simplelock spechash_slock;
127struct nfs_public nfs_pub; /* publicly exported FS */

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628 VOP_BWRITE(bp);
629 }
630 } else {
631 (void) VOP_BWRITE(bp);
632 }
633 break;
634 }
635 bp->b_flags |= (B_INVAL|B_NOCACHE|B_RELBUF);
636 bp->b_flags &= ~B_ASYNC;
634 brelse(bp);
635 }
636 }
637
638 while (vp->v_numoutput > 0) {
639 vp->v_flag |= VBWAIT;
640 tsleep(&vp->v_numoutput, PVM, "vnvlbv", 0);
641 }

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659
660 if (!(flags & V_SAVEMETA) &&
661 (vp->v_dirtyblkhd.lh_first || vp->v_cleanblkhd.lh_first))
662 panic("vinvalbuf: flush failed");
663 return (0);
664}
665
666/*
637 brelse(bp);
638 }
639 }
640
641 while (vp->v_numoutput > 0) {
642 vp->v_flag |= VBWAIT;
643 tsleep(&vp->v_numoutput, PVM, "vnvlbv", 0);
644 }

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662
663 if (!(flags & V_SAVEMETA) &&
664 (vp->v_dirtyblkhd.lh_first || vp->v_cleanblkhd.lh_first))
665 panic("vinvalbuf: flush failed");
666 return (0);
667}
668
669/*
670 * Truncate a file's buffer and pages to a specified length. This
671 * is in lieu of the old vinvalbuf mechanism, which performed unneeded
672 * sync activity.
673 */
674int
675vtruncbuf(vp, cred, p, length, blksize)
676 register struct vnode *vp;
677 struct ucred *cred;
678 struct proc *p;
679 off_t length;
680 int blksize;
681{
682 register struct buf *bp;
683 struct buf *nbp, *blist;
684 int s, error, anyfreed;
685 vm_object_t object;
686 int trunclbn;
687
688 /*
689 * Round up to the *next* lbn.
690 */
691 trunclbn = ((length + blksize - 1) / blksize) * blksize;
692
693 s = splbio();
694restart:
695 anyfreed = 1;
696 for (;anyfreed;) {
697 anyfreed = 0;
698 for ( bp = LIST_FIRST(&vp->v_cleanblkhd); bp; bp = nbp) {
699
700 nbp = LIST_NEXT(bp, b_vnbufs);
701
702 if (bp->b_lblkno >= trunclbn) {
703 if (bp->b_flags & B_BUSY) {
704 bp->b_flags |= B_WANTED;
705 tsleep((caddr_t) bp, PRIBIO, "vtrb1", 0);
706 nbp = bp;
707 } else {
708 bremfree(bp);
709 bp->b_flags |= (B_BUSY|B_INVAL|B_NOCACHE|B_RELBUF);
710 bp->b_flags &= ~B_ASYNC;
711 brelse(bp);
712 anyfreed = 1;
713 }
714 if (nbp &&
715 ((LIST_NEXT(nbp, b_vnbufs) == NOLIST) || (nbp->b_vp != vp) ||
716 (nbp->b_flags & B_DELWRI))) {
717 goto restart;
718 }
719 }
720 }
721
722 for (bp = LIST_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) {
723
724 nbp = LIST_NEXT(bp, b_vnbufs);
725
726 if (bp->b_lblkno >= trunclbn) {
727 if (bp->b_flags & B_BUSY) {
728 bp->b_flags |= B_WANTED;
729 tsleep((caddr_t) bp, PRIBIO, "vtrb2", 0);
730 nbp = bp;
731 } else {
732 bremfree(bp);
733 bp->b_flags |= (B_BUSY|B_INVAL|B_NOCACHE|B_RELBUF);
734 bp->b_flags &= ~B_ASYNC;
735 brelse(bp);
736 anyfreed = 1;
737 }
738 if (nbp &&
739 ((LIST_NEXT(nbp, b_vnbufs) == NOLIST) || (nbp->b_vp != vp) ||
740 (nbp->b_flags & B_DELWRI) == 0)) {
741 goto restart;
742 }
743 }
744 }
745 }
746 splx(s);
747
748 vnode_pager_setsize(vp, length);
749
750 return (0);
751}
752
753/*
667 * Associate a buffer with a vnode.
668 */
669void
670bgetvp(vp, bp)
671 register struct vnode *vp;
672 register struct buf *bp;
673{
674 int s;

--- 2004 unchanged lines hidden --- 		754 * Associate a buffer with a vnode.
755 */
756void
757bgetvp(vp, bp)
758 register struct vnode *vp;
759 register struct buf *bp;
760{
761 int s;

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