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Only use generic readahead on VREG vnodes, the space used to store the 

context is not valid on other types.
Prevents the crash reported in PR kern/38889, but does not fix the
mmap of block devices, more work is needed (no size on VBLK vnodes).
This commit is contained in:
martin 2012-06-01 14:52:48 +00:00
parent 6d16a86832
commit c5f76e4cca
1 changed files with 4 additions and 3 deletions
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7
sys/uvm/uvm_vnode.c
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@ -1,4 +1,4 @@
/* $NetBSD: uvm_vnode.c,v 1.97 2011/09/06 16:41:55 matt Exp $ */
/* $NetBSD: uvm_vnode.c,v 1.98 2012/06/01 14:52:48 martin Exp $ */
/*
* Copyright (c) 1997 Charles D. Cranor and Washington University.
@ -45,7 +45,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uvm_vnode.c,v 1.97 2011/09/06 16:41:55 matt Exp $");
__KERNEL_RCSID(0, "$NetBSD: uvm_vnode.c,v 1.98 2012/06/01 14:52:48 martin Exp $");
#include "opt_uvmhist.h"
@ -170,7 +170,8 @@ uvn_get(struct uvm_object *uobj, voff_t offset,
UVMHIST_LOG(ubchist, "vp %p off 0x%x", vp, (int)offset, 0,0);
if ((access_type & VM_PROT_WRITE) == 0 && (flags & PGO_LOCKED) == 0) {
if (vp->v_type == VREG && (access_type & VM_PROT_WRITE) == 0
&& (flags & PGO_LOCKED) == 0) {
vn_ra_allocctx(vp);
uvm_ra_request(vp->v_ractx, advice, uobj, offset,
*npagesp << PAGE_SHIFT);