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  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  * from: Utah $Hdr: vm_unix.c 1.1 89/11/07$
   35  *
   36  *      @(#)vm_unix.c   8.1 (Berkeley) 6/11/93
   37  */
   38 
   39 /*
   40  * Traditional sbrk/grow interface to VM
   41  */
   42 
   43 #include <sys/cdefs.h>
   44 __FBSDID("$FreeBSD: src/sys/vm/vm_unix.c,v 1.46 2005/01/07 02:29:27 imp Exp $");
   45 
   46 #include <sys/param.h>
   47 #include <sys/lock.h>
   48 #include <sys/mutex.h>
   49 #include <sys/proc.h>
   50 #include <sys/resourcevar.h>
   51 #include <sys/sysproto.h>
   52 #include <sys/systm.h>
   53 
   54 #include <vm/vm.h>
   55 #include <vm/vm_param.h>
   56 #include <vm/pmap.h>
   57 #include <vm/vm_map.h>
   58 
   59 #ifndef _SYS_SYSPROTO_H_
   60 struct obreak_args {
   61         char *nsize;
   62 };
   63 #endif
   64 
   65 /*
   66  * MPSAFE
   67  */
   68 /* ARGSUSED */
   69 int
   70 obreak(td, uap)
   71         struct thread *td;
   72         struct obreak_args *uap;
   73 {
   74         struct vmspace *vm = td->td_proc->p_vmspace;
   75         vm_offset_t new, old, base;
   76         rlim_t datalim, vmemlim;
   77         int rv;
   78         int error = 0;
   79         boolean_t do_map_wirefuture;
   80 
   81         PROC_LOCK(td->td_proc);
   82         datalim = lim_cur(td->td_proc, RLIMIT_DATA);
   83         vmemlim = lim_cur(td->td_proc, RLIMIT_VMEM);
   84         PROC_UNLOCK(td->td_proc);
   85 
   86         do_map_wirefuture = FALSE;
   87         new = round_page((vm_offset_t)uap->nsize);
   88         vm_map_lock(&vm->vm_map);
   89 
   90         base = round_page((vm_offset_t) vm->vm_daddr);
   91         old = base + ctob(vm->vm_dsize);
   92         if (new > base) {
   93                 /*
   94                  * Check the resource limit, but allow a process to reduce
   95                  * its usage, even if it remains over the limit.
   96                  */
   97                 if (new - base > datalim && new > old) {
   98                         error = ENOMEM;
   99                         goto done;
  100                 }
  101                 if (new > vm_map_max(&vm->vm_map)) {
  102                         error = ENOMEM;
  103                         goto done;
  104                 }
  105         } else if (new < base) {
  106                 /*
  107                  * This is simply an invalid value.  If someone wants to
  108                  * do fancy address space manipulations, mmap and munmap
  109                  * can do most of what the user would want.
  110                  */
  111                 error = EINVAL;
  112                 goto done;
  113         }
  114         if (new > old) {
  115                 if (vm->vm_map.size + (new - old) > vmemlim) {
  116                         error = ENOMEM;
  117                         goto done;
  118                 }
  119                 rv = vm_map_insert(&vm->vm_map, NULL, 0, old, new,
  120                     VM_PROT_ALL, VM_PROT_ALL, 0);
  121                 if (rv != KERN_SUCCESS) {
  122                         error = ENOMEM;
  123                         goto done;
  124                 }
  125                 vm->vm_dsize += btoc(new - old);
  126                 /*
  127                  * Handle the MAP_WIREFUTURE case for legacy applications,
  128                  * by marking the newly mapped range of pages as wired.
  129                  * We are not required to perform a corresponding
  130                  * vm_map_unwire() before vm_map_delete() below, as
  131                  * it will forcibly unwire the pages in the range.
  132                  *
  133                  * XXX If the pages cannot be wired, no error is returned.
  134                  */
  135                 if ((vm->vm_map.flags & MAP_WIREFUTURE) == MAP_WIREFUTURE) {
  136                         if (bootverbose)
  137                                 printf("obreak: MAP_WIREFUTURE set\n");
  138                         do_map_wirefuture = TRUE;
  139                 }
  140         } else if (new < old) {
  141                 rv = vm_map_delete(&vm->vm_map, new, old);
  142                 if (rv != KERN_SUCCESS) {
  143                         error = ENOMEM;
  144                         goto done;
  145                 }
  146                 vm->vm_dsize -= btoc(old - new);
  147         }
  148 done:
  149         vm_map_unlock(&vm->vm_map);
  150 
  151         if (do_map_wirefuture)
  152                 (void) vm_map_wire(&vm->vm_map, old, new,
  153                     VM_MAP_WIRE_USER|VM_MAP_WIRE_NOHOLES);
  154 
  155         return (error);
  156 }
  157 
  158 #ifndef _SYS_SYSPROTO_H_
  159 struct ovadvise_args {
  160         int anom;
  161 };
  162 #endif
  163 
  164 /*
  165  * MPSAFE
  166  */
  167 /* ARGSUSED */
  168 int
  169 ovadvise(td, uap)
  170         struct thread *td;
  171         struct ovadvise_args *uap;
  172 {
  173         /* START_GIANT_OPTIONAL */
  174         /* END_GIANT_OPTIONAL */
  175         return (EINVAL);
  176 }

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