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Less bogus allocation of softc to avoid races.

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Thanks for the hint David!
This commit is contained in:
Poul-Henning Kamp 1995-03-01 05:05:21 +00:00
parent 3aed948b88
commit ee32cbed3b
1 changed files with 17 additions and 30 deletions
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47
sys/dev/vn/vn.c
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@ -1,4 +1,3 @@
#define DEBUG 1
/*
* Copyright (c) 1988 University of Utah.
* Copyright (c) 1990, 1993
@ -62,6 +61,12 @@
#include "vn.h"
#if NVN > 0
/* default is to have 8 VN's */
#if NVN < 8
#undef NVN
#define NVN 8
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
@ -120,8 +125,7 @@ struct vn_softc {
/* sc_flags */
#define VNF_INITED 0x01
struct vn_softc **vn_softc;
int numvnd;
struct vn_softc *vn_softc[NVN];
/*
* XXX these decls should be static (without __P(())) or elsewhere.
@ -142,13 +146,15 @@ int vndump __P((dev_t dev));
int
vnclose(dev_t dev, int flags, int mode, struct proc *p)
{
#ifdef TEST_LABELLING
struct vn_softc *vn;
vn = vn_softc[vnunit(dev)];
#ifdef TEST_LABELLING
if (vn->sc_slices != NULL)
dsclose(dev, mode, vn->sc_slices);
#endif
vn_softc[vnunit(dev)] = 0;
free(vn, M_DEVBUF);
return (0);
}
@ -156,30 +162,15 @@ int
vnopen(dev_t dev, int flags, int mode, struct proc *p)
{
int unit = vnunit(dev),size;
struct vn_softc **vscp, **old, *vn;
struct vn_softc *vn;
#ifdef DEBUG
if (vndebug & VDB_FOLLOW)
printf("vnopen(0x%lx, 0x%x, 0x%x, %p)\n", dev, flags, mode, p);
#endif
if (unit >= numvnd) {
/*
* We need to get more space for our config. If you say
* this is overkill, you're absolutely right.
*/
size = (unit+1) * (sizeof *vn_softc);
vscp = (struct vn_softc **) malloc(size, M_DEVBUF, M_WAITOK);
if (!vscp)
return(ENOMEM);
bzero(vscp,size);
if (numvnd)
bcopy(vn_softc, vscp, numvnd * (sizeof *vn_softc));
numvnd = unit + 1;
old = vn_softc;
vn_softc = vscp;
if (old)
free(old, M_DEVBUF);
}
if (unit >= NVN)
return(ENOENT);
vn = vn_softc[unit];
if (!vn) {
vn = malloc(sizeof *vn, M_DEVBUF, M_WAITOK);
@ -449,10 +440,7 @@ vnioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
error = suser(p->p_ucred, &p->p_acflag);
if (error)
return (error);
/*
* XXX test is unnecessary?
*/
if (unit >= numvnd)
if (unit >= NVN)
return (ENXIO);
vn = vn_softc[unit];
@ -588,7 +576,7 @@ vnshutdown()
{
int i;
for (i = 0; i < numvnd; i++)
for (i = 0; i < NVN; i++)
if (vn_softc[i] && vn_softc[i]->sc_flags & VNF_INITED)
vnclear(vn_softc[i]);
}
@ -624,8 +612,7 @@ vnsize(dev_t dev)
{
int unit = vnunit(dev);
if (!vn_softc ||
unit >= numvnd ||
if (unit >= NVN || (!vn_softc[unit]) ||
(vn_softc[unit]->sc_flags & VNF_INITED) == 0)
return(-1);
return(vn_softc[unit]->sc_size);