e028603b7e
(this commit is just the first stage). Also add various GIANT_ macros to formalize the removal of Giant, making it easy to test in a more piecemeal fashion. These macros will allow us to test fine-grained locks to a degree before removing Giant, and also after, and to remove Giant in a piecemeal fashion via sysctl's on those subsystems which the authors believe can operate without Giant.
911 lines
21 KiB
C
911 lines
21 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kern_resource.c 8.5 (Berkeley) 1/21/94
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* $FreeBSD$
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*/
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#include "opt_compat.h"
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#include "opt_rlimit.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sysproto.h>
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#include <sys/file.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/resourcevar.h>
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#include <sys/sx.h>
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#include <sys/time.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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static int donice __P((struct proc *curp, struct proc *chgp, int n));
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/* dosetrlimit non-static: Needed by SysVR4 emulator */
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int dosetrlimit __P((struct proc *p, u_int which, struct rlimit *limp));
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static MALLOC_DEFINE(M_UIDINFO, "uidinfo", "uidinfo structures");
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#define UIHASH(uid) (&uihashtbl[(uid) & uihash])
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static struct mtx uihashtbl_mtx;
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static LIST_HEAD(uihashhead, uidinfo) *uihashtbl;
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static u_long uihash; /* size of hash table - 1 */
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static struct uidinfo *uilookup __P((uid_t uid));
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/*
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* Resource controls and accounting.
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*/
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#ifndef _SYS_SYSPROTO_H_
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struct getpriority_args {
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int which;
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int who;
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};
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#endif
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int
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getpriority(curp, uap)
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struct proc *curp;
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register struct getpriority_args *uap;
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{
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register struct proc *p;
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register int low = PRIO_MAX + 1;
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switch (uap->which) {
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case PRIO_PROCESS:
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if (uap->who == 0)
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low = curp->p_nice;
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else {
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p = pfind(uap->who);
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if (p == NULL)
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break;
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if (p_can(curp, p, P_CAN_SEE, NULL) == 0)
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low = p->p_nice;
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PROC_UNLOCK(p);
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}
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break;
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case PRIO_PGRP: {
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register struct pgrp *pg;
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if (uap->who == 0)
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pg = curp->p_pgrp;
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else if ((pg = pgfind(uap->who)) == NULL)
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break;
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LIST_FOREACH(p, &pg->pg_members, p_pglist) {
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if (!p_can(curp, p, P_CAN_SEE, NULL) && p->p_nice < low)
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low = p->p_nice;
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}
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break;
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}
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case PRIO_USER:
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if (uap->who == 0)
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uap->who = curp->p_ucred->cr_uid;
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sx_slock(&allproc_lock);
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LIST_FOREACH(p, &allproc, p_list)
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if (!p_can(curp, p, P_CAN_SEE, NULL) &&
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p->p_ucred->cr_uid == uap->who &&
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p->p_nice < low)
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low = p->p_nice;
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sx_sunlock(&allproc_lock);
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break;
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default:
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return (EINVAL);
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}
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if (low == PRIO_MAX + 1)
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return (ESRCH);
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curp->p_retval[0] = low;
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return (0);
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}
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#ifndef _SYS_SYSPROTO_H_
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struct setpriority_args {
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int which;
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int who;
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int prio;
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};
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#endif
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/* ARGSUSED */
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int
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setpriority(curp, uap)
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struct proc *curp;
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register struct setpriority_args *uap;
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{
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register struct proc *p;
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int found = 0, error = 0;
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switch (uap->which) {
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case PRIO_PROCESS:
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if (uap->who == 0)
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error = donice(curp, curp, uap->prio);
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else {
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p = pfind(uap->who);
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if (p == 0)
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break;
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if (p_can(curp, p, P_CAN_SEE, NULL) == 0)
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error = donice(curp, p, uap->prio);
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PROC_UNLOCK(p);
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}
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found++;
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break;
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case PRIO_PGRP: {
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register struct pgrp *pg;
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if (uap->who == 0)
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pg = curp->p_pgrp;
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else if ((pg = pgfind(uap->who)) == NULL)
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break;
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LIST_FOREACH(p, &pg->pg_members, p_pglist) {
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if (!p_can(curp, p, P_CAN_SEE, NULL)) {
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error = donice(curp, p, uap->prio);
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found++;
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}
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}
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break;
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}
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case PRIO_USER:
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if (uap->who == 0)
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uap->who = curp->p_ucred->cr_uid;
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sx_slock(&allproc_lock);
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LIST_FOREACH(p, &allproc, p_list)
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if (p->p_ucred->cr_uid == uap->who &&
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!p_can(curp, p, P_CAN_SEE, NULL)) {
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error = donice(curp, p, uap->prio);
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found++;
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}
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sx_sunlock(&allproc_lock);
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break;
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default:
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return (EINVAL);
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}
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if (found == 0)
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return (ESRCH);
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return (error);
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}
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static int
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donice(curp, chgp, n)
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register struct proc *curp, *chgp;
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register int n;
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{
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int error;
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if ((error = p_can(curp, chgp, P_CAN_SCHED, NULL)))
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return (error);
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if (n > PRIO_MAX)
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n = PRIO_MAX;
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if (n < PRIO_MIN)
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n = PRIO_MIN;
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if (n < chgp->p_nice && suser(curp))
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return (EACCES);
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chgp->p_nice = n;
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(void)resetpriority(chgp);
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return (0);
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}
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/* rtprio system call */
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#ifndef _SYS_SYSPROTO_H_
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struct rtprio_args {
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int function;
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pid_t pid;
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struct rtprio *rtp;
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};
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#endif
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/*
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* Set realtime priority
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*/
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/* ARGSUSED */
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int
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rtprio(curp, uap)
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struct proc *curp;
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register struct rtprio_args *uap;
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{
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register struct proc *p;
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struct rtprio rtp;
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int error;
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if (uap->pid == 0) {
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p = curp;
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PROC_LOCK(p);
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} else
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p = pfind(uap->pid);
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if (p == NULL)
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return (ESRCH);
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switch (uap->function) {
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case RTP_LOOKUP:
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if ((error = p_can(curp, p, P_CAN_SEE, NULL)))
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break;
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pri_to_rtp(&p->p_pri, &rtp);
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error = copyout(&rtp, uap->rtp, sizeof(struct rtprio));
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break;
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case RTP_SET:
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if ((error = p_can(curp, p, P_CAN_SCHED, NULL)) ||
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(error = copyin(uap->rtp, &rtp, sizeof(struct rtprio))))
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break;
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/* disallow setting rtprio in most cases if not superuser */
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if (suser(curp) != 0) {
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/* can't set someone else's */
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if (uap->pid) {
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error = EPERM;
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break;
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}
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/* can't set realtime priority */
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/*
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* Realtime priority has to be restricted for reasons which should be
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* obvious. However, for idle priority, there is a potential for
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* system deadlock if an idleprio process gains a lock on a resource
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* that other processes need (and the idleprio process can't run
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* due to a CPU-bound normal process). Fix me! XXX
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*/
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#if 0
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if (RTP_PRIO_IS_REALTIME(rtp.type))
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#endif
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if (rtp.type != RTP_PRIO_NORMAL) {
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error = EPERM;
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break;
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}
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}
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error = rtp_to_pri(&rtp, &p->p_pri);
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break;
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default:
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error = EINVAL;
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break;
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}
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PROC_UNLOCK(p);
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return (error);
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}
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int
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rtp_to_pri(struct rtprio *rtp, struct priority *pri)
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{
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if (rtp->prio > RTP_PRIO_MAX)
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return (EINVAL);
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switch (RTP_PRIO_BASE(rtp->type)) {
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case RTP_PRIO_REALTIME:
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pri->pri_level = PRI_MIN_REALTIME + rtp->prio;
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break;
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case RTP_PRIO_NORMAL:
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pri->pri_level = PRI_MIN_TIMESHARE + rtp->prio;
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break;
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case RTP_PRIO_IDLE:
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pri->pri_level = PRI_MIN_IDLE + rtp->prio;
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break;
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default:
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return (EINVAL);
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}
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pri->pri_class = rtp->type;
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pri->pri_native = pri->pri_level;
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pri->pri_user = pri->pri_level;
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return (0);
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}
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void
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pri_to_rtp(struct priority *pri, struct rtprio *rtp)
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{
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switch (PRI_BASE(pri->pri_class)) {
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case PRI_REALTIME:
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rtp->prio = pri->pri_level - PRI_MIN_REALTIME;
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break;
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case PRI_TIMESHARE:
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rtp->prio = pri->pri_level - PRI_MIN_TIMESHARE;
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break;
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case PRI_IDLE:
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rtp->prio = pri->pri_level - PRI_MIN_IDLE;
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break;
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default:
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break;
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}
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rtp->type = pri->pri_class;
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}
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#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
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#ifndef _SYS_SYSPROTO_H_
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struct osetrlimit_args {
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u_int which;
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struct orlimit *rlp;
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};
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#endif
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/* ARGSUSED */
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int
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osetrlimit(p, uap)
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struct proc *p;
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register struct osetrlimit_args *uap;
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{
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struct orlimit olim;
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struct rlimit lim;
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int error;
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if ((error =
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copyin((caddr_t)uap->rlp, (caddr_t)&olim, sizeof(struct orlimit))))
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return (error);
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lim.rlim_cur = olim.rlim_cur;
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lim.rlim_max = olim.rlim_max;
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return (dosetrlimit(p, uap->which, &lim));
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}
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#ifndef _SYS_SYSPROTO_H_
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struct ogetrlimit_args {
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u_int which;
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struct orlimit *rlp;
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};
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#endif
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/* ARGSUSED */
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int
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ogetrlimit(p, uap)
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struct proc *p;
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register struct ogetrlimit_args *uap;
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{
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struct orlimit olim;
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if (uap->which >= RLIM_NLIMITS)
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return (EINVAL);
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olim.rlim_cur = p->p_rlimit[uap->which].rlim_cur;
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if (olim.rlim_cur == -1)
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olim.rlim_cur = 0x7fffffff;
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olim.rlim_max = p->p_rlimit[uap->which].rlim_max;
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if (olim.rlim_max == -1)
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olim.rlim_max = 0x7fffffff;
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return (copyout((caddr_t)&olim, (caddr_t)uap->rlp, sizeof(olim)));
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}
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#endif /* COMPAT_43 || COMPAT_SUNOS */
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#ifndef _SYS_SYSPROTO_H_
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struct __setrlimit_args {
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u_int which;
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struct rlimit *rlp;
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};
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#endif
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/* ARGSUSED */
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int
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setrlimit(p, uap)
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struct proc *p;
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register struct __setrlimit_args *uap;
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{
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struct rlimit alim;
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int error;
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if ((error =
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copyin((caddr_t)uap->rlp, (caddr_t)&alim, sizeof (struct rlimit))))
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return (error);
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return (dosetrlimit(p, uap->which, &alim));
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}
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int
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dosetrlimit(p, which, limp)
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struct proc *p;
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u_int which;
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struct rlimit *limp;
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{
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register struct rlimit *alimp;
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int error;
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GIANT_REQUIRED;
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if (which >= RLIM_NLIMITS)
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return (EINVAL);
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alimp = &p->p_rlimit[which];
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/*
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* Preserve historical bugs by treating negative limits as unsigned.
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*/
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if (limp->rlim_cur < 0)
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limp->rlim_cur = RLIM_INFINITY;
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if (limp->rlim_max < 0)
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limp->rlim_max = RLIM_INFINITY;
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if (limp->rlim_cur > alimp->rlim_max ||
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limp->rlim_max > alimp->rlim_max)
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if ((error = suser_xxx(0, p, PRISON_ROOT)))
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return (error);
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if (limp->rlim_cur > limp->rlim_max)
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limp->rlim_cur = limp->rlim_max;
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if (p->p_limit->p_refcnt > 1 &&
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(p->p_limit->p_lflags & PL_SHAREMOD) == 0) {
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p->p_limit->p_refcnt--;
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p->p_limit = limcopy(p->p_limit);
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alimp = &p->p_rlimit[which];
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}
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switch (which) {
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case RLIMIT_CPU:
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if (limp->rlim_cur > RLIM_INFINITY / (rlim_t)1000000)
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p->p_limit->p_cpulimit = RLIM_INFINITY;
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else
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p->p_limit->p_cpulimit =
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(rlim_t)1000000 * limp->rlim_cur;
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break;
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case RLIMIT_DATA:
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if (limp->rlim_cur > MAXDSIZ)
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limp->rlim_cur = MAXDSIZ;
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if (limp->rlim_max > MAXDSIZ)
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limp->rlim_max = MAXDSIZ;
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break;
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case RLIMIT_STACK:
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|
if (limp->rlim_cur > MAXSSIZ)
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limp->rlim_cur = MAXSSIZ;
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if (limp->rlim_max > MAXSSIZ)
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limp->rlim_max = MAXSSIZ;
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/*
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|
* Stack is allocated to the max at exec time with only
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* "rlim_cur" bytes accessible. If stack limit is going
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* up make more accessible, if going down make inaccessible.
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*/
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if (limp->rlim_cur != alimp->rlim_cur) {
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vm_offset_t addr;
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vm_size_t size;
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vm_prot_t prot;
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if (limp->rlim_cur > alimp->rlim_cur) {
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prot = VM_PROT_ALL;
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size = limp->rlim_cur - alimp->rlim_cur;
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addr = USRSTACK - limp->rlim_cur;
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} else {
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prot = VM_PROT_NONE;
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size = alimp->rlim_cur - limp->rlim_cur;
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addr = USRSTACK - alimp->rlim_cur;
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}
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addr = trunc_page(addr);
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size = round_page(size);
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(void) vm_map_protect(&p->p_vmspace->vm_map,
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addr, addr+size, prot, FALSE);
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}
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break;
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case RLIMIT_NOFILE:
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if (limp->rlim_cur > maxfilesperproc)
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limp->rlim_cur = maxfilesperproc;
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if (limp->rlim_max > maxfilesperproc)
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limp->rlim_max = maxfilesperproc;
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break;
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|
|
case RLIMIT_NPROC:
|
|
if (limp->rlim_cur > maxprocperuid)
|
|
limp->rlim_cur = maxprocperuid;
|
|
if (limp->rlim_max > maxprocperuid)
|
|
limp->rlim_max = maxprocperuid;
|
|
if (limp->rlim_cur < 1)
|
|
limp->rlim_cur = 1;
|
|
if (limp->rlim_max < 1)
|
|
limp->rlim_max = 1;
|
|
break;
|
|
}
|
|
*alimp = *limp;
|
|
return (0);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct __getrlimit_args {
|
|
u_int which;
|
|
struct rlimit *rlp;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
getrlimit(p, uap)
|
|
struct proc *p;
|
|
register struct __getrlimit_args *uap;
|
|
{
|
|
|
|
if (uap->which >= RLIM_NLIMITS)
|
|
return (EINVAL);
|
|
return (copyout((caddr_t)&p->p_rlimit[uap->which], (caddr_t)uap->rlp,
|
|
sizeof (struct rlimit)));
|
|
}
|
|
|
|
/*
|
|
* Transform the running time and tick information in proc p into user,
|
|
* system, and interrupt time usage.
|
|
*/
|
|
void
|
|
calcru(p, up, sp, ip)
|
|
struct proc *p;
|
|
struct timeval *up;
|
|
struct timeval *sp;
|
|
struct timeval *ip;
|
|
{
|
|
/* {user, system, interrupt, total} {ticks, usec}; previous tu: */
|
|
u_int64_t ut, uu, st, su, it, iu, tt, tu, ptu;
|
|
int s;
|
|
struct timeval tv;
|
|
|
|
mtx_assert(&sched_lock, MA_OWNED);
|
|
/* XXX: why spl-protect ? worst case is an off-by-one report */
|
|
s = splstatclock();
|
|
ut = p->p_uticks;
|
|
st = p->p_sticks;
|
|
it = p->p_iticks;
|
|
splx(s);
|
|
|
|
tt = ut + st + it;
|
|
if (tt == 0) {
|
|
st = 1;
|
|
tt = 1;
|
|
}
|
|
|
|
tu = p->p_runtime;
|
|
if (p == curproc) {
|
|
/*
|
|
* Adjust for the current time slice. This is actually fairly
|
|
* important since the error here is on the order of a time
|
|
* quantum, which is much greater than the sampling error.
|
|
*/
|
|
microuptime(&tv);
|
|
if (timevalcmp(&tv, PCPU_PTR(switchtime), <))
|
|
printf("microuptime() went backwards (%ld.%06ld -> %ld.%06ld)\n",
|
|
PCPU_GET(switchtime.tv_sec), PCPU_GET(switchtime.tv_usec),
|
|
tv.tv_sec, tv.tv_usec);
|
|
else
|
|
tu += (tv.tv_usec - PCPU_GET(switchtime.tv_usec)) +
|
|
(tv.tv_sec - PCPU_GET(switchtime.tv_sec)) *
|
|
(int64_t)1000000;
|
|
}
|
|
ptu = p->p_uu + p->p_su + p->p_iu;
|
|
if (tu < ptu || (int64_t)tu < 0) {
|
|
/* XXX no %qd in kernel. Truncate. */
|
|
printf("calcru: negative time of %ld usec for pid %d (%s)\n",
|
|
(long)tu, p->p_pid, p->p_comm);
|
|
tu = ptu;
|
|
}
|
|
|
|
/* Subdivide tu. */
|
|
uu = (tu * ut) / tt;
|
|
su = (tu * st) / tt;
|
|
iu = tu - uu - su;
|
|
|
|
/* Enforce monotonicity. */
|
|
if (uu < p->p_uu || su < p->p_su || iu < p->p_iu) {
|
|
if (uu < p->p_uu)
|
|
uu = p->p_uu;
|
|
else if (uu + p->p_su + p->p_iu > tu)
|
|
uu = tu - p->p_su - p->p_iu;
|
|
if (st == 0)
|
|
su = p->p_su;
|
|
else {
|
|
su = ((tu - uu) * st) / (st + it);
|
|
if (su < p->p_su)
|
|
su = p->p_su;
|
|
else if (uu + su + p->p_iu > tu)
|
|
su = tu - uu - p->p_iu;
|
|
}
|
|
KASSERT(uu + su + p->p_iu <= tu,
|
|
("calcru: monotonisation botch 1"));
|
|
iu = tu - uu - su;
|
|
KASSERT(iu >= p->p_iu,
|
|
("calcru: monotonisation botch 2"));
|
|
}
|
|
p->p_uu = uu;
|
|
p->p_su = su;
|
|
p->p_iu = iu;
|
|
|
|
up->tv_sec = uu / 1000000;
|
|
up->tv_usec = uu % 1000000;
|
|
sp->tv_sec = su / 1000000;
|
|
sp->tv_usec = su % 1000000;
|
|
if (ip != NULL) {
|
|
ip->tv_sec = iu / 1000000;
|
|
ip->tv_usec = iu % 1000000;
|
|
}
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct getrusage_args {
|
|
int who;
|
|
struct rusage *rusage;
|
|
};
|
|
#endif
|
|
/* ARGSUSED */
|
|
int
|
|
getrusage(p, uap)
|
|
register struct proc *p;
|
|
register struct getrusage_args *uap;
|
|
{
|
|
register struct rusage *rup;
|
|
|
|
switch (uap->who) {
|
|
|
|
case RUSAGE_SELF:
|
|
rup = &p->p_stats->p_ru;
|
|
mtx_lock_spin(&sched_lock);
|
|
calcru(p, &rup->ru_utime, &rup->ru_stime, NULL);
|
|
mtx_unlock_spin(&sched_lock);
|
|
break;
|
|
|
|
case RUSAGE_CHILDREN:
|
|
rup = &p->p_stats->p_cru;
|
|
break;
|
|
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
return (copyout((caddr_t)rup, (caddr_t)uap->rusage,
|
|
sizeof (struct rusage)));
|
|
}
|
|
|
|
void
|
|
ruadd(ru, ru2)
|
|
register struct rusage *ru, *ru2;
|
|
{
|
|
register long *ip, *ip2;
|
|
register int i;
|
|
|
|
timevaladd(&ru->ru_utime, &ru2->ru_utime);
|
|
timevaladd(&ru->ru_stime, &ru2->ru_stime);
|
|
if (ru->ru_maxrss < ru2->ru_maxrss)
|
|
ru->ru_maxrss = ru2->ru_maxrss;
|
|
ip = &ru->ru_first; ip2 = &ru2->ru_first;
|
|
for (i = &ru->ru_last - &ru->ru_first; i >= 0; i--)
|
|
*ip++ += *ip2++;
|
|
}
|
|
|
|
/*
|
|
* Make a copy of the plimit structure.
|
|
* We share these structures copy-on-write after fork,
|
|
* and copy when a limit is changed.
|
|
*/
|
|
struct plimit *
|
|
limcopy(lim)
|
|
struct plimit *lim;
|
|
{
|
|
register struct plimit *copy;
|
|
|
|
MALLOC(copy, struct plimit *, sizeof(struct plimit),
|
|
M_SUBPROC, M_WAITOK);
|
|
bcopy(lim->pl_rlimit, copy->pl_rlimit, sizeof(struct plimit));
|
|
copy->p_lflags = 0;
|
|
copy->p_refcnt = 1;
|
|
return (copy);
|
|
}
|
|
|
|
/*
|
|
* Find the uidinfo structure for a uid. This structure is used to
|
|
* track the total resource consumption (process count, socket buffer
|
|
* size, etc.) for the uid and impose limits.
|
|
*/
|
|
void
|
|
uihashinit()
|
|
{
|
|
|
|
uihashtbl = hashinit(maxproc / 16, M_UIDINFO, &uihash);
|
|
mtx_init(&uihashtbl_mtx, "uidinfo hash", MTX_DEF);
|
|
}
|
|
|
|
/*
|
|
* lookup a uidinfo struct for the parameter uid.
|
|
* uihashtbl_mtx must be locked.
|
|
*/
|
|
static struct uidinfo *
|
|
uilookup(uid)
|
|
uid_t uid;
|
|
{
|
|
struct uihashhead *uipp;
|
|
struct uidinfo *uip;
|
|
|
|
mtx_assert(&uihashtbl_mtx, MA_OWNED);
|
|
uipp = UIHASH(uid);
|
|
LIST_FOREACH(uip, uipp, ui_hash)
|
|
if (uip->ui_uid == uid)
|
|
break;
|
|
|
|
return (uip);
|
|
}
|
|
|
|
/*
|
|
* Find or allocate a struct uidinfo for a particular uid.
|
|
* Increase refcount on uidinfo struct returned.
|
|
* uifree() should be called on a struct uidinfo when released.
|
|
*/
|
|
struct uidinfo *
|
|
uifind(uid)
|
|
uid_t uid;
|
|
{
|
|
struct uidinfo *uip;
|
|
|
|
mtx_lock(&uihashtbl_mtx);
|
|
uip = uilookup(uid);
|
|
if (uip == NULL) {
|
|
struct uidinfo *old_uip;
|
|
|
|
mtx_unlock(&uihashtbl_mtx);
|
|
uip = malloc(sizeof(*uip), M_UIDINFO, M_WAITOK | M_ZERO);
|
|
mtx_lock(&uihashtbl_mtx);
|
|
/*
|
|
* There's a chance someone created our uidinfo while we
|
|
* were in malloc and not holding the lock, so we have to
|
|
* make sure we don't insert a duplicate uidinfo
|
|
*/
|
|
if ((old_uip = uilookup(uid)) != NULL) {
|
|
/* someone else beat us to it */
|
|
free(uip, M_UIDINFO);
|
|
uip = old_uip;
|
|
} else {
|
|
mtx_init(&uip->ui_mtx, "uidinfo struct", MTX_DEF);
|
|
uip->ui_uid = uid;
|
|
LIST_INSERT_HEAD(UIHASH(uid), uip, ui_hash);
|
|
}
|
|
}
|
|
uihold(uip);
|
|
mtx_unlock(&uihashtbl_mtx);
|
|
return (uip);
|
|
}
|
|
|
|
/*
|
|
* Place another refcount on a uidinfo struct.
|
|
*/
|
|
void
|
|
uihold(uip)
|
|
struct uidinfo *uip;
|
|
{
|
|
|
|
mtx_lock(&uip->ui_mtx);
|
|
uip->ui_ref++;
|
|
mtx_unlock(&uip->ui_mtx);
|
|
}
|
|
|
|
/*-
|
|
* Since uidinfo structs have a long lifetime, we use an
|
|
* opportunistic refcounting scheme to avoid locking the lookup hash
|
|
* for each release.
|
|
*
|
|
* If the refcount hits 0, we need to free the structure,
|
|
* which means we need to lock the hash.
|
|
* Optimal case:
|
|
* After locking the struct and lowering the refcount, if we find
|
|
* that we don't need to free, simply unlock and return.
|
|
* Suboptimal case:
|
|
* If refcount lowering results in need to free, bump the count
|
|
* back up, loose the lock and aquire the locks in the proper
|
|
* order to try again.
|
|
*/
|
|
void
|
|
uifree(uip)
|
|
struct uidinfo *uip;
|
|
{
|
|
|
|
/* Prepare for optimal case. */
|
|
mtx_lock(&uip->ui_mtx);
|
|
|
|
if (--uip->ui_ref != 0) {
|
|
mtx_unlock(&uip->ui_mtx);
|
|
return;
|
|
}
|
|
|
|
/* Prepare for suboptimal case. */
|
|
uip->ui_ref++;
|
|
mtx_unlock(&uip->ui_mtx);
|
|
mtx_lock(&uihashtbl_mtx);
|
|
mtx_lock(&uip->ui_mtx);
|
|
|
|
/*
|
|
* We must subtract one from the count again because we backed out
|
|
* our initial subtraction before dropping the lock.
|
|
* Since another thread may have added a reference after we dropped the
|
|
* initial lock we have to test for zero again.
|
|
*/
|
|
if (--uip->ui_ref == 0) {
|
|
LIST_REMOVE(uip, ui_hash);
|
|
mtx_unlock(&uihashtbl_mtx);
|
|
if (uip->ui_sbsize != 0)
|
|
/* XXX no %qd in kernel. Truncate. */
|
|
printf("freeing uidinfo: uid = %d, sbsize = %ld\n",
|
|
uip->ui_uid, (long)uip->ui_sbsize);
|
|
if (uip->ui_proccnt != 0)
|
|
printf("freeing uidinfo: uid = %d, proccnt = %ld\n",
|
|
uip->ui_uid, uip->ui_proccnt);
|
|
mtx_destroy(&uip->ui_mtx);
|
|
FREE(uip, M_UIDINFO);
|
|
return;
|
|
}
|
|
|
|
mtx_unlock(&uihashtbl_mtx);
|
|
mtx_unlock(&uip->ui_mtx);
|
|
}
|
|
|
|
/*
|
|
* Change the count associated with number of processes
|
|
* a given user is using. When 'max' is 0, don't enforce a limit
|
|
*/
|
|
int
|
|
chgproccnt(uip, diff, max)
|
|
struct uidinfo *uip;
|
|
int diff;
|
|
int max;
|
|
{
|
|
|
|
mtx_lock(&uip->ui_mtx);
|
|
/* don't allow them to exceed max, but allow subtraction */
|
|
if (diff > 0 && uip->ui_proccnt + diff > max && max != 0) {
|
|
mtx_unlock(&uip->ui_mtx);
|
|
return (0);
|
|
}
|
|
uip->ui_proccnt += diff;
|
|
if (uip->ui_proccnt < 0)
|
|
printf("negative proccnt for uid = %d\n", uip->ui_uid);
|
|
mtx_unlock(&uip->ui_mtx);
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Change the total socket buffer size a user has used.
|
|
*/
|
|
int
|
|
chgsbsize(uip, hiwat, to, max)
|
|
struct uidinfo *uip;
|
|
u_long *hiwat;
|
|
u_long to;
|
|
rlim_t max;
|
|
{
|
|
rlim_t new;
|
|
int s;
|
|
|
|
s = splnet();
|
|
mtx_lock(&uip->ui_mtx);
|
|
new = uip->ui_sbsize + to - *hiwat;
|
|
/* don't allow them to exceed max, but allow subtraction */
|
|
if (to > *hiwat && new > max) {
|
|
splx(s);
|
|
mtx_unlock(&uip->ui_mtx);
|
|
return (0);
|
|
}
|
|
uip->ui_sbsize = new;
|
|
*hiwat = to;
|
|
if (uip->ui_sbsize < 0)
|
|
printf("negative sbsize for uid = %d\n", uip->ui_uid);
|
|
splx(s);
|
|
mtx_unlock(&uip->ui_mtx);
|
|
return (1);
|
|
}
|