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Add a VNDIOF_FORCE flag which forces unconfiguration if the emulated

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disk is still in use.
Not for everyday use, but we have to face eg USB flash drives being
unplugged at the wrong time, and this is a way to simulate this without
wearing out the connectors.
This commit is contained in:
drochner 2003-04-11 16:11:49 +00:00
parent 7e56069d9c
commit ea7f1bd035
2 changed files with 36 additions and 11 deletions
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44
sys/dev/vnd.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: vnd.c,v 1.94 2003/03/27 15:34:36 yamt Exp $ */ /* $NetBSD: vnd.c,v 1.95 2003/04/11 16:11:49 drochner Exp $ */
/*- /*-
* Copyright (c) 1996, 1997, 1998 The NetBSD Foundation, Inc. * Copyright (c) 1996, 1997, 1998 The NetBSD Foundation, Inc.
@ -98,7 +98,7 @@
*/ */
#include <sys/cdefs.h> #include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vnd.c,v 1.94 2003/03/27 15:34:36 yamt Exp $"); __KERNEL_RCSID(0, "$NetBSD: vnd.c,v 1.95 2003/04/11 16:11:49 drochner Exp $");
#if defined(_KERNEL_OPT) #if defined(_KERNEL_OPT)
#include "fs_nfs.h" #include "fs_nfs.h"
@ -170,12 +170,14 @@ int numvnd = 0;
void vndattach __P((int)); void vndattach __P((int));
int vnddetach __P((void)); int vnddetach __P((void));
void vndclear __P((struct vnd_softc *)); void vndclear __P((struct vnd_softc *, int));
void vndstart __P((struct vnd_softc *)); void vndstart __P((struct vnd_softc *));
int vndsetcred __P((struct vnd_softc *, struct ucred *)); int vndsetcred __P((struct vnd_softc *, struct ucred *));
void vndthrottle __P((struct vnd_softc *, struct vnode *)); void vndthrottle __P((struct vnd_softc *, struct vnode *));
void vndiodone __P((struct buf *)); void vndiodone __P((struct buf *));
#if 0
void vndshutdown __P((void)); void vndshutdown __P((void));
#endif
void vndgetdefaultlabel __P((struct vnd_softc *, struct disklabel *)); void vndgetdefaultlabel __P((struct vnd_softc *, struct disklabel *));
void vndgetdisklabel __P((dev_t)); void vndgetdisklabel __P((dev_t));
@ -224,9 +226,11 @@ vndattach(num)
vnd_softc = (struct vnd_softc *)mem; vnd_softc = (struct vnd_softc *)mem;
numvnd = num; numvnd = num;
for (i = 0; i < numvnd; i++) for (i = 0; i < numvnd; i++) {
vnd_softc[i].sc_unit = i;
bufq_alloc(&vnd_softc[i].sc_tab, bufq_alloc(&vnd_softc[i].sc_tab,
BUFQ_DISKSORT|BUFQ_SORT_RAWBLOCK); BUFQ_DISKSORT|BUFQ_SORT_RAWBLOCK);
}
} }
int int
@ -919,14 +923,20 @@ unlock_and_exit:
*/ */
part = DISKPART(dev); part = DISKPART(dev);
pmask = (1 << part); pmask = (1 << part);
if ((vnd->sc_dkdev.dk_openmask & ~pmask) || if (((vnd->sc_dkdev.dk_openmask & ~pmask) ||
((vnd->sc_dkdev.dk_bopenmask & pmask) && ((vnd->sc_dkdev.dk_bopenmask & pmask) &&
(vnd->sc_dkdev.dk_copenmask & pmask))) { (vnd->sc_dkdev.dk_copenmask & pmask))) &&
!(vio->vnd_flags & VNDIOF_FORCE)) {
vndunlock(vnd); vndunlock(vnd);
return (EBUSY); return (EBUSY);
} }
vndclear(vnd); /*
* XXX vndclear() might call vndclose() implicitely;
* release lock to avoid recursion
*/
vndunlock(vnd);
vndclear(vnd, minor(dev));
#ifdef DEBUG #ifdef DEBUG
if (vnddebug & VDB_INIT) if (vnddebug & VDB_INIT)
printf("vndioctl: CLRed\n"); printf("vndioctl: CLRed\n");
@ -939,8 +949,6 @@ unlock_and_exit:
/* Detatch the disk. */ /* Detatch the disk. */
disk_detach(&vnd->sc_dkdev); disk_detach(&vnd->sc_dkdev);
vndunlock(vnd);
break; break;
case VNDIOCGET: { case VNDIOCGET: {
@ -1133,6 +1141,7 @@ vndthrottle(vnd, vp)
vnd->sc_maxactive = 1; vnd->sc_maxactive = 1;
} }
#if 0
void void
vndshutdown() vndshutdown()
{ {
@ -1142,19 +1151,34 @@ vndshutdown()
if (vnd->sc_flags & VNF_INITED) if (vnd->sc_flags & VNF_INITED)
vndclear(vnd); vndclear(vnd);
} }
#endif
void void
vndclear(vnd) vndclear(vnd, myminor)
struct vnd_softc *vnd; struct vnd_softc *vnd;
int myminor;
{ {
struct vnode *vp = vnd->sc_vp; struct vnode *vp = vnd->sc_vp;
struct proc *p = curproc; /* XXX */ struct proc *p = curproc; /* XXX */
int fflags = FREAD; int fflags = FREAD;
int bmaj, cmaj, i, mn;
#ifdef DEBUG #ifdef DEBUG
if (vnddebug & VDB_FOLLOW) if (vnddebug & VDB_FOLLOW)
printf("vndclear(%p): vp %p\n", vnd, vp); printf("vndclear(%p): vp %p\n", vnd, vp);
#endif #endif
/* locate the major number */
bmaj = bdevsw_lookup_major(&vnd_bdevsw);
cmaj = cdevsw_lookup_major(&vnd_cdevsw);
/* Nuke the vnodes for any open instances */
for (i = 0; i < MAXPARTITIONS; i++) {
mn = DISKMINOR(vnd->sc_unit, i);
vdevgone(bmaj, mn, mn, VBLK);
if (mn != myminor) /* XXX avoid to kill own vnode */
vdevgone(cmaj, mn, mn, VCHR);
}
if ((vnd->sc_flags & VNF_READONLY) == 0) if ((vnd->sc_flags & VNF_READONLY) == 0)
fflags |= FWRITE; fflags |= FWRITE;
vnd->sc_flags &= ~(VNF_INITED | VNF_READONLY); vnd->sc_flags &= ~(VNF_INITED | VNF_READONLY);

3
sys/dev/vndvar.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: vndvar.h,v 1.9 2003/03/27 15:34:36 yamt Exp $ */ /* $NetBSD: vndvar.h,v 1.10 2003/04/11 16:11:49 drochner Exp $ */
/*- /*-
* Copyright (c) 1996, 1997, 1998 The NetBSD Foundation, Inc. * Copyright (c) 1996, 1997, 1998 The NetBSD Foundation, Inc.
@ -103,6 +103,7 @@ struct vnd_ioctl {
/* vnd_flags */ /* vnd_flags */
#define VNDIOF_HASGEOM 0x01 /* use specified geometry */ #define VNDIOF_HASGEOM 0x01 /* use specified geometry */
#define VNDIOF_READONLY 0x02 /* as read-only device */ #define VNDIOF_READONLY 0x02 /* as read-only device */
#define VNDIOF_FORCE 0x04 /* force close */
#ifdef _KERNEL #ifdef _KERNEL