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: src/sys/vm/vm_unix.c,v 1.11.2.1 1999/09/05 08:24:42 peter Exp $
   42  */
   43 
   44 /*
   45  * Traditional sbrk/grow interface to VM
   46  */
   47 #include <sys/param.h>
   48 #include <sys/systm.h>
   49 #include <sys/sysproto.h>
   50 #include <sys/proc.h>
   51 #include <sys/resourcevar.h>
   52 
   53 #include <vm/vm.h>
   54 #include <vm/vm_param.h>
   55 #include <vm/lock.h>
   56 #include <vm/pmap.h>
   57 #include <vm/vm_map.h>
   58 #include <vm/swap_pager.h>
   59 #include <vm/vm_prot.h>
   60 
   61 #ifndef _SYS_SYSPROTO_H_
   62 struct obreak_args {
   63         char *nsize;
   64 };
   65 #endif
   66 
   67 /* ARGSUSED */
   68 int
   69 obreak(p, uap, retval)
   70         struct proc *p;
   71         struct obreak_args *uap;
   72         int *retval;
   73 {
   74         register struct vmspace *vm = p->p_vmspace;
   75         vm_offset_t new, old, base;
   76         int rv;
   77 
   78         base = round_page((vm_offset_t) vm->vm_daddr);
   79         new = round_page(uap->nsize);
   80         if (new > base) {
   81                 if ((new - base) > (unsigned) p->p_rlimit[RLIMIT_DATA].rlim_cur)
   82                         return ENOMEM;
   83                 if (new >= VM_MAXUSER_ADDRESS)
   84                         return (ENOMEM);
   85         } else if (new < base) {
   86                 /*
   87                  * This is simply an invalid value.  If someone wants to
   88                  * do fancy address space manipulations, mmap and munmap
   89                  * can do most of what the user would want.
   90                  */
   91                 return EINVAL;
   92         }
   93 
   94         old = base + ctob(vm->vm_dsize);
   95 
   96         if (new > old) {
   97                 vm_size_t diff;
   98                 if (swap_pager_full) {
   99                         return (ENOMEM);
  100                 }
  101                 diff = new - old;
  102                 rv = vm_map_find(&vm->vm_map, NULL, 0, &old, diff, FALSE,
  103                         VM_PROT_ALL, VM_PROT_ALL, 0);
  104                 if (rv != KERN_SUCCESS) {
  105                         return (ENOMEM);
  106                 }
  107                 vm->vm_dsize += btoc(diff);
  108         } else if (new < old) {
  109                 rv = vm_map_remove(&vm->vm_map, new, old);
  110                 if (rv != KERN_SUCCESS) {
  111                         return (ENOMEM);
  112                 }
  113                 vm->vm_dsize -= btoc(old - new);
  114         }
  115         return (0);
  116 }
  117 
  118 #ifndef _SYS_SYSPROTO_H_
  119 struct ovadvise_args {
  120         int anom;
  121 };
  122 #endif
  123 
  124 /* ARGSUSED */
  125 int
  126 ovadvise(p, uap, retval)
  127         struct proc *p;
  128         struct ovadvise_args *uap;
  129         int *retval;
  130 {
  131 
  132         return (EINVAL);
  133 }

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