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Widen usecount and writecount to prevent overflow.

This commit is contained in:
mycroft 1999-10-01 22:03:17 +00:00
parent c572ae61ed
commit fde519b5e2
1 changed files with 22 additions and 3 deletions
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25
sys/kern/vfs_subr.c
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@ -1,4 +1,4 @@
/* $NetBSD: vfs_subr.c,v 1.111 1999/10/01 21:57:42 mycroft Exp $ */
/* $NetBSD: vfs_subr.c,v 1.112 1999/10/01 22:03:17 mycroft Exp $ */
/*-
* Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
@ -909,6 +909,12 @@ vget(vp, flags)
simple_unlock(&vnode_free_list_slock);
}
vp->v_usecount++;
#ifdef DIAGNOSTIC
if (vp->v_usecount == 0) {
vprint("vget", vp);
panic("vget: usecount overflow");
}
#endif
if (flags & LK_TYPE_MASK) {
if ((error = vn_lock(vp, flags | LK_INTERLOCK)))
vrele(vp);
@ -1031,6 +1037,12 @@ vref(vp)
if (vp->v_usecount <= 0)
panic("vref used where vget required");
vp->v_usecount++;
#ifdef DIAGNOSTIC
if (vp->v_usecount == 0) {
vprint("vref", vp);
panic("vref: usecount overflow");
}
#endif
simple_unlock(&vp->v_interlock);
}
#endif /* DIAGNOSTIC */
@ -1143,9 +1155,16 @@ vclean(vp, flags, p)
* so that its count cannot fall to zero and generate a
* race against ourselves to recycle it.
*/
if ((active = vp->v_usecount) != 0)
if ((active = vp->v_usecount) != 0) {
/* We have the vnode interlock. */
vp->v_usecount++;
#ifdef DIAGNOSTIC
if (vp->v_usecount == 0) {
vprint("vclean", vp);
panic("vclean: usecount overflow");
}
#endif
}
/*
* Prevent the vnode from being recycled or
@ -1459,7 +1478,7 @@ vprint(label, vp)
if (label != NULL)
printf("%s: ", label);
printf("type %s, usecount %d, writecount %d, refcount %ld,",
printf("type %s, usecount %ld, writecount %ld, refcount %ld,",
typename[vp->v_type], vp->v_usecount, vp->v_writecount,
vp->v_holdcnt);
buf[0] = '\0';