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Refuse to open a block device with zero open count when it has 

a mountpoint set.  This may happen after forced detach or unplug
of a mounted block device.
This commit is contained in:
hannken 2017-06-24 12:14:21 +00:00
parent 5985f10515
commit 3764143ef7
1 changed files with 6 additions and 3 deletions
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9
sys/miscfs/specfs/spec_vnops.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: spec_vnops.c,v 1.173 2017/06/01 02:45:14 chs Exp $ */
/* $NetBSD: spec_vnops.c,v 1.174 2017/06/24 12:14:21 hannken Exp $ */
/*-
* Copyright (c) 2008 The NetBSD Foundation, Inc.
@ -58,7 +58,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: spec_vnops.c,v 1.173 2017/06/01 02:45:14 chs Exp $");
__KERNEL_RCSID(0, "$NetBSD: spec_vnops.c,v 1.174 2017/06/24 12:14:21 hannken Exp $");
#include <sys/param.h>
#include <sys/proc.h>
@ -580,13 +580,16 @@ spec_open(void *v)
* For block devices, permit only one open. The buffer
* cache cannot remain self-consistent with multiple
* vnodes holding a block device open.
*
* Treat zero opencnt with non-NULL mountpoint as open.
* This may happen after forced detach of a mounted device.
*/
mutex_enter(&device_lock);
if (sn->sn_gone) {
mutex_exit(&device_lock);
return (EBADF);
}
if (sd->sd_opencnt != 0) {
if (sd->sd_opencnt != 0 || sd->sd_mountpoint != NULL) {
mutex_exit(&device_lock);
return EBUSY;
}