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 #include "opt_compat.h"
   40 
   41 /*
   42  * Traditional sbrk/grow interface to VM
   43  */
   44 
   45 #include <sys/cdefs.h>
   46 __FBSDID("$FreeBSD$");
   47 
   48 #include <sys/param.h>
   49 #include <sys/lock.h>
   50 #include <sys/mutex.h>
   51 #include <sys/proc.h>
   52 #include <sys/racct.h>
   53 #include <sys/resourcevar.h>
   54 #include <sys/sysent.h>
   55 #include <sys/sysproto.h>
   56 #include <sys/systm.h>
   57 
   58 #include <vm/vm.h>
   59 #include <vm/vm_param.h>
   60 #include <vm/pmap.h>
   61 #include <vm/vm_map.h>
   62 
   63 #ifndef _SYS_SYSPROTO_H_
   64 struct obreak_args {
   65         char *nsize;
   66 };
   67 #endif
   68 
   69 /*
   70  * MPSAFE
   71  */
   72 /* ARGSUSED */
   73 int
   74 sys_obreak(struct thread *td, struct obreak_args *uap)
   75 {
   76         struct vmspace *vm = td->td_proc->p_vmspace;
   77         vm_map_t map = &vm->vm_map;
   78         vm_offset_t new, old, base;
   79         rlim_t datalim, lmemlim, vmemlim;
   80         int prot, rv;
   81         int error = 0;
   82         boolean_t do_map_wirefuture;
   83 
   84         datalim = lim_cur(td, RLIMIT_DATA);
   85         lmemlim = lim_cur(td, RLIMIT_MEMLOCK);
   86         vmemlim = lim_cur(td, RLIMIT_VMEM);
   87 
   88         do_map_wirefuture = FALSE;
   89         new = round_page((vm_offset_t)uap->nsize);
   90         vm_map_lock(map);
   91 
   92         base = round_page((vm_offset_t) vm->vm_daddr);
   93         old = base + ctob(vm->vm_dsize);
   94         if (new > base) {
   95                 /*
   96                  * Check the resource limit, but allow a process to reduce
   97                  * its usage, even if it remains over the limit.
   98                  */
   99                 if (new - base > datalim && new > old) {
  100                         error = ENOMEM;
  101                         goto done;
  102                 }
  103                 if (new > vm_map_max(map)) {
  104                         error = ENOMEM;
  105                         goto done;
  106                 }
  107         } else if (new < base) {
  108                 /*
  109                  * This is simply an invalid value.  If someone wants to
  110                  * do fancy address space manipulations, mmap and munmap
  111                  * can do most of what the user would want.
  112                  */
  113                 error = EINVAL;
  114                 goto done;
  115         }
  116         if (new > old) {
  117                 if (!old_mlock && map->flags & MAP_WIREFUTURE) {
  118                         if (ptoa(pmap_wired_count(map->pmap)) +
  119                             (new - old) > lmemlim) {
  120                                 error = ENOMEM;
  121                                 goto done;
  122                         }
  123                 }
  124                 if (map->size + (new - old) > vmemlim) {
  125                         error = ENOMEM;
  126                         goto done;
  127                 }
  128 #ifdef RACCT
  129                 if (racct_enable) {
  130                         PROC_LOCK(td->td_proc);
  131                         error = racct_set(td->td_proc, RACCT_DATA, new - base);
  132                         if (error != 0) {
  133                                 PROC_UNLOCK(td->td_proc);
  134                                 error = ENOMEM;
  135                                 goto done;
  136                         }
  137                         error = racct_set(td->td_proc, RACCT_VMEM,
  138                             map->size + (new - old));
  139                         if (error != 0) {
  140                                 racct_set_force(td->td_proc, RACCT_DATA,
  141                                     old - base);
  142                                 PROC_UNLOCK(td->td_proc);
  143                                 error = ENOMEM;
  144                                 goto done;
  145                         }
  146                         if (!old_mlock && map->flags & MAP_WIREFUTURE) {
  147                                 error = racct_set(td->td_proc, RACCT_MEMLOCK,
  148                                     ptoa(pmap_wired_count(map->pmap)) +
  149                                     (new - old));
  150                                 if (error != 0) {
  151                                         racct_set_force(td->td_proc, RACCT_DATA,
  152                                             old - base);
  153                                         racct_set_force(td->td_proc, RACCT_VMEM,
  154                                             map->size);
  155                                         PROC_UNLOCK(td->td_proc);
  156                                         error = ENOMEM;
  157                                         goto done;
  158                                 }
  159                         }
  160                         PROC_UNLOCK(td->td_proc);
  161                 }
  162 #endif
  163                 prot = VM_PROT_RW;
  164 #ifdef COMPAT_FREEBSD32
  165 #if defined(__amd64__)
  166                 if (i386_read_exec && SV_PROC_FLAG(td->td_proc, SV_ILP32))
  167                         prot |= VM_PROT_EXECUTE;
  168 #endif
  169 #endif
  170                 rv = vm_map_insert(map, NULL, 0, old, new, prot, VM_PROT_ALL, 0);
  171                 if (rv != KERN_SUCCESS) {
  172 #ifdef RACCT
  173                         if (racct_enable) {
  174                                 PROC_LOCK(td->td_proc);
  175                                 racct_set_force(td->td_proc,
  176                                     RACCT_DATA, old - base);
  177                                 racct_set_force(td->td_proc,
  178                                     RACCT_VMEM, map->size);
  179                                 if (!old_mlock && map->flags & MAP_WIREFUTURE) {
  180                                         racct_set_force(td->td_proc,
  181                                             RACCT_MEMLOCK,
  182                                             ptoa(pmap_wired_count(map->pmap)));
  183                                 }
  184                                 PROC_UNLOCK(td->td_proc);
  185                         }
  186 #endif
  187                         error = ENOMEM;
  188                         goto done;
  189                 }
  190                 vm->vm_dsize += btoc(new - old);
  191                 /*
  192                  * Handle the MAP_WIREFUTURE case for legacy applications,
  193                  * by marking the newly mapped range of pages as wired.
  194                  * We are not required to perform a corresponding
  195                  * vm_map_unwire() before vm_map_delete() below, as
  196                  * it will forcibly unwire the pages in the range.
  197                  *
  198                  * XXX If the pages cannot be wired, no error is returned.
  199                  */
  200                 if ((map->flags & MAP_WIREFUTURE) == MAP_WIREFUTURE) {
  201                         if (bootverbose)
  202                                 printf("obreak: MAP_WIREFUTURE set\n");
  203                         do_map_wirefuture = TRUE;
  204                 }
  205         } else if (new < old) {
  206                 rv = vm_map_delete(map, new, old);
  207                 if (rv != KERN_SUCCESS) {
  208                         error = ENOMEM;
  209                         goto done;
  210                 }
  211                 vm->vm_dsize -= btoc(old - new);
  212 #ifdef RACCT
  213                 if (racct_enable) {
  214                         PROC_LOCK(td->td_proc);
  215                         racct_set_force(td->td_proc, RACCT_DATA, new - base);
  216                         racct_set_force(td->td_proc, RACCT_VMEM, map->size);
  217                         if (!old_mlock && map->flags & MAP_WIREFUTURE) {
  218                                 racct_set_force(td->td_proc, RACCT_MEMLOCK,
  219                                     ptoa(pmap_wired_count(map->pmap)));
  220                         }
  221                         PROC_UNLOCK(td->td_proc);
  222                 }
  223 #endif
  224         }
  225 done:
  226         vm_map_unlock(map);
  227 
  228         if (do_map_wirefuture)
  229                 (void) vm_map_wire(map, old, new,
  230                     VM_MAP_WIRE_USER|VM_MAP_WIRE_NOHOLES);
  231 
  232         return (error);
  233 }
  234 
  235 #ifndef _SYS_SYSPROTO_H_
  236 struct ovadvise_args {
  237         int anom;
  238 };
  239 #endif
  240 
  241 /*
  242  * MPSAFE
  243  */
  244 /* ARGSUSED */
  245 int
  246 sys_ovadvise(struct thread *td, struct ovadvise_args *uap)
  247 {
  248         /* START_GIANT_OPTIONAL */
  249         /* END_GIANT_OPTIONAL */
  250         return (EINVAL);
  251 }
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FreeBSD/Linux Kernel Cross Reference sys/vm/vm_unix.c

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