vm_unix.c revision 116226
11541Srgrimes/* 21541Srgrimes * Copyright (c) 1988 University of Utah. 31541Srgrimes * Copyright (c) 1991, 1993 41541Srgrimes * The Regents of the University of California. All rights reserved. 51541Srgrimes * 61541Srgrimes * This code is derived from software contributed to Berkeley by 71541Srgrimes * the Systems Programming Group of the University of Utah Computer 81541Srgrimes * Science Department. 91541Srgrimes * 101541Srgrimes * Redistribution and use in source and binary forms, with or without 111541Srgrimes * modification, are permitted provided that the following conditions 121541Srgrimes * are met: 131541Srgrimes * 1. Redistributions of source code must retain the above copyright 141541Srgrimes * notice, this list of conditions and the following disclaimer. 151541Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 161541Srgrimes * notice, this list of conditions and the following disclaimer in the 171541Srgrimes * documentation and/or other materials provided with the distribution. 181541Srgrimes * 3. All advertising materials mentioning features or use of this software 1958705Scharnier * must display the following acknowledgement: 201541Srgrimes * This product includes software developed by the University of 211541Srgrimes * California, Berkeley and its contributors. 221541Srgrimes * 4. Neither the name of the University nor the names of its contributors 231541Srgrimes * may be used to endorse or promote products derived from this software 241541Srgrimes * without specific prior written permission. 251541Srgrimes * 261541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 271541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 281541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 291541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 301541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 311541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 321541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 331541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 341541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 351541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 361541Srgrimes * SUCH DAMAGE. 371541Srgrimes * 381541Srgrimes * from: Utah $Hdr: vm_unix.c 1.1 89/11/07$ 391541Srgrimes * 401541Srgrimes * @(#)vm_unix.c 8.1 (Berkeley) 6/11/93 411541Srgrimes */ 421541Srgrimes 431541Srgrimes/* 441541Srgrimes * Traditional sbrk/grow interface to VM 451541Srgrimes */ 4677139Sjhb 47116226Sobrien#include <sys/cdefs.h> 48116226Sobrien__FBSDID("$FreeBSD: head/sys/vm/vm_unix.c 116226 2003-06-11 23:50:51Z obrien $"); 49116226Sobrien 501541Srgrimes#include <sys/param.h> 5176166Smarkm#include <sys/lock.h> 5276981Sjhb#include <sys/mutex.h> 531541Srgrimes#include <sys/proc.h> 541541Srgrimes#include <sys/resourcevar.h> 5576981Sjhb#include <sys/sysproto.h> 5676827Salfred#include <sys/systm.h> 571541Srgrimes 581541Srgrimes#include <vm/vm.h> 5912662Sdg#include <vm/vm_param.h> 6012662Sdg#include <vm/pmap.h> 6112662Sdg#include <vm/vm_map.h> 621541Srgrimes 6312221Sbde#ifndef _SYS_SYSPROTO_H_ 641541Srgrimesstruct obreak_args { 6512206Sbde char *nsize; 661541Srgrimes}; 6712221Sbde#endif 681549Srgrimes 6982697Sdillon/* 7082697Sdillon * MPSAFE 7182697Sdillon */ 721541Srgrimes/* ARGSUSED */ 731541Srgrimesint 7483366Sjulianobreak(td, uap) 7583366Sjulian struct thread *td; 761541Srgrimes struct obreak_args *uap; 771541Srgrimes{ 7883366Sjulian struct vmspace *vm = td->td_proc->p_vmspace; 7916679Sdyson vm_offset_t new, old, base; 801541Srgrimes int rv; 8179224Sdillon int error = 0; 821541Srgrimes 8398460Salc new = round_page((vm_offset_t)uap->nsize); 8498460Salc vm_map_lock(&vm->vm_map); 8579224Sdillon 8616679Sdyson base = round_page((vm_offset_t) vm->vm_daddr); 8766748Sdwmalone old = base + ctob(vm->vm_dsize); 8816679Sdyson if (new > base) { 8966748Sdwmalone /* 9098498Salc * Check the resource limit, but allow a process to reduce 9198498Salc * its usage, even if it remains over the limit. 9266748Sdwmalone */ 9398498Salc if (new - base > td->td_proc->p_rlimit[RLIMIT_DATA].rlim_cur && 9498498Salc new > old) { 9579224Sdillon error = ENOMEM; 9679224Sdillon goto done; 9779224Sdillon } 98103767Sjake if (new > vm_map_max(&vm->vm_map)) { 9979224Sdillon error = ENOMEM; 10079224Sdillon goto done; 10179224Sdillon } 10216679Sdyson } else if (new < base) { 10316679Sdyson /* 10416679Sdyson * This is simply an invalid value. If someone wants to 10516679Sdyson * do fancy address space manipulations, mmap and munmap 10616679Sdyson * can do most of what the user would want. 10716679Sdyson */ 10879224Sdillon error = EINVAL; 10979224Sdillon goto done; 11016679Sdyson } 11116679Sdyson if (new > old) { 11298833Sdillon if (vm->vm_map.size + (new - old) > 11398833Sdillon td->td_proc->p_rlimit[RLIMIT_VMEM].rlim_cur) { 11498833Sdillon error = ENOMEM; 11598833Sdillon goto done; 11698833Sdillon } 11798460Salc rv = vm_map_insert(&vm->vm_map, NULL, 0, old, new, 11898460Salc VM_PROT_ALL, VM_PROT_ALL, 0); 1191541Srgrimes if (rv != KERN_SUCCESS) { 12079224Sdillon error = ENOMEM; 12179224Sdillon goto done; 1221541Srgrimes } 12398460Salc vm->vm_dsize += btoc(new - old); 12416679Sdyson } else if (new < old) { 12598460Salc rv = vm_map_delete(&vm->vm_map, new, old); 1261541Srgrimes if (rv != KERN_SUCCESS) { 12779224Sdillon error = ENOMEM; 12879224Sdillon goto done; 1291541Srgrimes } 13016679Sdyson vm->vm_dsize -= btoc(old - new); 1311541Srgrimes } 13279224Sdillondone: 13398460Salc vm_map_unlock(&vm->vm_map); 13479224Sdillon return (error); 1351541Srgrimes} 1361541Srgrimes 13712221Sbde#ifndef _SYS_SYSPROTO_H_ 1381541Srgrimesstruct ovadvise_args { 1395455Sdg int anom; 1401541Srgrimes}; 14112221Sbde#endif 1421549Srgrimes 14382697Sdillon/* 14482697Sdillon * MPSAFE 14582697Sdillon */ 1461541Srgrimes/* ARGSUSED */ 1471541Srgrimesint 14883366Sjulianovadvise(td, uap) 14983366Sjulian struct thread *td; 1501541Srgrimes struct ovadvise_args *uap; 1511541Srgrimes{ 15279224Sdillon /* START_GIANT_OPTIONAL */ 15379224Sdillon /* END_GIANT_OPTIONAL */ 1541541Srgrimes return (EINVAL); 1551541Srgrimes} 156