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buffer pager: skip bogus pages.

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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
This commit is contained in:
Konstantin Belousov 2020-03-30 21:42:46 +00:00
parent 0ac8511aef
commit bbca4bd7cd
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=359464
1 changed files with 8 additions and 2 deletions
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10
sys/kern/vfs_bio.c
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@ -5154,12 +5154,16 @@ vfs_bio_getpages(struct vnode *vp, vm_page_t *ma, int count,
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 @@ next_page:;
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,