The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/vm/vm_unix.c

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    1 /*
    2  * Copyright (c) 1988 University of Utah.
    3  * Copyright (c) 1991, 1993
    4  *      The Regents of the University of California.  All rights reserved.
    5  *
    6  * This code is derived from software contributed to Berkeley by
    7  * the Systems Programming Group of the University of Utah Computer
    8  * Science Department.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by the University of
   21  *      California, Berkeley and its contributors.
   22  * 4. Neither the name of the University nor the names of its contributors
   23  *    may be used to endorse or promote products derived from this software
   24  *    without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   36  * SUCH DAMAGE.
   37  *
   38  * from: Utah $Hdr: vm_unix.c 1.1 89/11/07$
   39  *
   40  *      @(#)vm_unix.c   8.1 (Berkeley) 6/11/93
   41  * $FreeBSD: releng/5.0/sys/vm/vm_unix.c 103767 2002-09-21 22:07:17Z jake $
   42  */
   43 
   44 /*
   45  * Traditional sbrk/grow interface to VM
   46  */
   47 
   48 #include <sys/param.h>
   49 #include <sys/lock.h>
   50 #include <sys/mutex.h>
   51 #include <sys/proc.h>
   52 #include <sys/resourcevar.h>
   53 #include <sys/sysproto.h>
   54 #include <sys/systm.h>
   55 
   56 #include <vm/vm.h>
   57 #include <vm/vm_param.h>
   58 #include <vm/pmap.h>
   59 #include <vm/vm_map.h>
   60 
   61 #ifndef _SYS_SYSPROTO_H_
   62 struct obreak_args {
   63         char *nsize;
   64 };
   65 #endif
   66 
   67 /*
   68  * MPSAFE
   69  */
   70 /* ARGSUSED */
   71 int
   72 obreak(td, uap)
   73         struct thread *td;
   74         struct obreak_args *uap;
   75 {
   76         struct vmspace *vm = td->td_proc->p_vmspace;
   77         vm_offset_t new, old, base;
   78         int rv;
   79         int error = 0;
   80 
   81         new = round_page((vm_offset_t)uap->nsize);
   82         vm_map_lock(&vm->vm_map);
   83 
   84         base = round_page((vm_offset_t) vm->vm_daddr);
   85         old = base + ctob(vm->vm_dsize);
   86         if (new > base) {
   87                 /*
   88                  * Check the resource limit, but allow a process to reduce
   89                  * its usage, even if it remains over the limit.
   90                  */
   91                 if (new - base > td->td_proc->p_rlimit[RLIMIT_DATA].rlim_cur &&
   92                     new > old) {
   93                         error = ENOMEM;
   94                         goto done;
   95                 }
   96                 if (new > vm_map_max(&vm->vm_map)) {
   97                         error = ENOMEM;
   98                         goto done;
   99                 }
  100         } else if (new < base) {
  101                 /*
  102                  * This is simply an invalid value.  If someone wants to
  103                  * do fancy address space manipulations, mmap and munmap
  104                  * can do most of what the user would want.
  105                  */
  106                 error = EINVAL;
  107                 goto done;
  108         }
  109         if (new > old) {
  110                 if (vm->vm_map.size + (new - old) >
  111                     td->td_proc->p_rlimit[RLIMIT_VMEM].rlim_cur) {
  112                         error = ENOMEM;
  113                         goto done;
  114                 }
  115                 rv = vm_map_insert(&vm->vm_map, NULL, 0, old, new,
  116                     VM_PROT_ALL, VM_PROT_ALL, 0);
  117                 if (rv != KERN_SUCCESS) {
  118                         error = ENOMEM;
  119                         goto done;
  120                 }
  121                 vm->vm_dsize += btoc(new - old);
  122         } else if (new < old) {
  123                 rv = vm_map_delete(&vm->vm_map, new, old);
  124                 if (rv != KERN_SUCCESS) {
  125                         error = ENOMEM;
  126                         goto done;
  127                 }
  128                 vm->vm_dsize -= btoc(old - new);
  129         }
  130 done:
  131         vm_map_unlock(&vm->vm_map);
  132         return (error);
  133 }
  134 
  135 #ifndef _SYS_SYSPROTO_H_
  136 struct ovadvise_args {
  137         int anom;
  138 };
  139 #endif
  140 
  141 /*
  142  * MPSAFE
  143  */
  144 /* ARGSUSED */
  145 int
  146 ovadvise(td, uap)
  147         struct thread *td;
  148         struct ovadvise_args *uap;
  149 {
  150         /* START_GIANT_OPTIONAL */
  151         /* END_GIANT_OPTIONAL */
  152         return (EINVAL);
  153 }

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