[src/trunk]: src/sys/uvm ubc_alloc_direct(): for a write make sure pages are ...

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details:   https://anonhg.NetBSD.org/src/rev/c7460450d274
branches:  trunk
changeset: 931239:c7460450d274
user:      ad <ad%NetBSD.org@localhost>
date:      Fri Apr 24 19:47:03 2020 +0000

description:
ubc_alloc_direct(): for a write make sure pages are always marked dirty
because there's no managed mapping.

diffstat:

 sys/uvm/uvm_bio.c |  11 ++++++++---
 1 files changed, 8 insertions(+), 3 deletions(-)

diffs (42 lines):

diff -r 5832b44f032c -r c7460450d274 sys/uvm/uvm_bio.c
--- a/sys/uvm/uvm_bio.c Fri Apr 24 19:38:10 2020 +0000
+++ b/sys/uvm/uvm_bio.c Fri Apr 24 19:47:03 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: uvm_bio.c,v 1.111 2020/04/23 21:53:01 ad Exp $ */
+/*     $NetBSD: uvm_bio.c,v 1.112 2020/04/24 19:47:03 ad Exp $ */
 
 /*
  * Copyright (c) 1998 Chuck Silvers.
@@ -34,7 +34,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: uvm_bio.c,v 1.111 2020/04/23 21:53:01 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: uvm_bio.c,v 1.112 2020/04/24 19:47:03 ad Exp $");
 
 #include "opt_uvmhist.h"
 #include "opt_ubc.h"
@@ -888,6 +888,11 @@
 
                /* Page must be writable by now */
                KASSERT((pg->flags & PG_RDONLY) == 0 || (flags & UBC_WRITE) == 0);
+
+               /* No managed mapping - mark the page dirty. */
+               if ((flags & UBC_WRITE) != 0) {
+                       uvm_pagemarkdirty(pg, UVM_PAGE_STATUS_DIRTY);   
+               }
        }
        rw_exit(uobj->vmobjlock);
 
@@ -916,10 +921,10 @@
 
                /* Page was changed, no longer fake and neither clean. */
                if (flags & UBC_WRITE) {
-                       pg->flags &= ~PG_FAKE;
                        KASSERTMSG(uvm_pagegetdirty(pg) ==
                            UVM_PAGE_STATUS_DIRTY,
                            "page %p not dirty", pg);
+                       pg->flags &= ~PG_FAKE;
                }
        }
        rw_exit(uobj->vmobjlock);