svn commit: r359464 - head/sys/kern
Konstantin Belousov
kib at FreeBSD.org
Mon Mar 30 22:01:46 UTC 2020
Author: kib
Date: Mon Mar 30 21:42:46 2020
New Revision: 359464
URL: https://svnweb.freebsd.org/changeset/base/359464
Log:
buffer pager: skip bogus pages.
We cannot validate bogus page by reading a buffer.
PR: 244713
Reviewed by: glebius, markj
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D24038
Modified:
head/sys/kern/vfs_bio.c
Modified: head/sys/kern/vfs_bio.c
==============================================================================
--- head/sys/kern/vfs_bio.c Mon Mar 30 21:40:35 2020 (r359463)
+++ head/sys/kern/vfs_bio.c Mon Mar 30 21:42:46 2020 (r359464)
@@ -5154,12 +5154,16 @@ vfs_bio_getpages(struct vnode *vp, vm_page_t *ma, int
br_flags = (mp != NULL && (mp->mnt_kern_flag & MNTK_UNMAPPED_BUFS)
!= 0) ? GB_UNMAPPED : 0;
again:
- for (i = 0; i < count; i++)
- vm_page_busy_downgrade(ma[i]);
+ for (i = 0; i < count; i++) {
+ if (ma[i] != bogus_page)
+ vm_page_busy_downgrade(ma[i]);
+ }
lbnp = -1;
for (i = 0; i < count; i++) {
m = ma[i];
+ if (m == bogus_page)
+ continue;
/*
* Pages are shared busy and the object lock is not
@@ -5228,6 +5232,8 @@ end_pages:
redo = false;
for (i = 0; i < count; i++) {
+ if (ma[i] == bogus_page)
+ continue;
if (vm_page_busy_tryupgrade(ma[i]) == 0) {
vm_page_sunbusy(ma[i]);
ma[i] = vm_page_grab_unlocked(object, ma[i]->pindex,
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