[src/trunk]: src/sys/dev When reading or writing the backing store us POSIX_F...

[hannken <hannken%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/e2d1795d1e5f
branches:  trunk
changeset: 766391:e2d1795d1e5f
user:      hannken <hannken%NetBSD.org@localhost>
date:      Tue Jun 21 12:41:24 2011 +0000

description:
When reading or writing the backing store us POSIX_FADV_NOREUSE access hint
to prevent read ahead.

diffstat:

 sys/dev/fss.c |  9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diffs (34 lines):

diff -r 685f54c00938 -r e2d1795d1e5f sys/dev/fss.c
--- a/sys/dev/fss.c     Tue Jun 21 12:38:27 2011 +0000
+++ b/sys/dev/fss.c     Tue Jun 21 12:41:24 2011 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: fss.c,v 1.75 2011/06/12 03:35:51 rmind Exp $   */
+/*     $NetBSD: fss.c,v 1.76 2011/06/21 12:41:24 hannken Exp $ */
 
 /*-
  * Copyright (c) 2003 The NetBSD Foundation, Inc.
@@ -36,7 +36,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: fss.c,v 1.75 2011/06/12 03:35:51 rmind Exp $");
+__KERNEL_RCSID(0, "$NetBSD: fss.c,v 1.76 2011/06/21 12:41:24 hannken Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -978,12 +978,13 @@
        vn_lock(sc->sc_bs_vp, LK_EXCLUSIVE|LK_RETRY);
 
        error = vn_rdwr((rw == FSS_READ ? UIO_READ : UIO_WRITE), sc->sc_bs_vp,
-           data, len, off, UIO_SYSSPACE, IO_UNIT|IO_NODELOCKED,
+           data, len, off, UIO_SYSSPACE,
+           IO_ADV_ENCODE(POSIX_FADV_NOREUSE) | IO_NODELOCKED,
            sc->sc_bs_lwp->l_cred, NULL, NULL);
        if (error == 0) {
                mutex_enter(sc->sc_bs_vp->v_interlock);
                error = VOP_PUTPAGES(sc->sc_bs_vp, trunc_page(off),
-                   round_page(off+len), PGO_CLEANIT|PGO_SYNCIO|PGO_FREE);
+                   round_page(off+len), PGO_CLEANIT | PGO_FREE | PGO_SYNCIO);
        }
 
        VOP_UNLOCK(sc->sc_bs_vp);