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 #include "opt_compat.h"
   40 
   41 /*
   42  * Traditional sbrk/grow interface to VM
   43  */
   44 
   45 #include <sys/cdefs.h>
   46 __FBSDID("$FreeBSD: stable/10/sys/vm/vm_unix.c 284665 2015-06-21 06:28:26Z trasz $");
   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(td, uap)
   75         struct thread *td;
   76         struct obreak_args *uap;
   77 {
   78         struct vmspace *vm = td->td_proc->p_vmspace;
   79         vm_map_t map = &vm->vm_map;
   80         vm_offset_t new, old, base;
   81         rlim_t datalim, lmemlim, vmemlim;
   82         int prot, rv;
   83         int error = 0;
   84         boolean_t do_map_wirefuture;
   85 
   86         PROC_LOCK(td->td_proc);
   87         datalim = lim_cur(td->td_proc, RLIMIT_DATA);
   88         lmemlim = lim_cur(td->td_proc, RLIMIT_MEMLOCK);
   89         vmemlim = lim_cur(td->td_proc, RLIMIT_VMEM);
   90         PROC_UNLOCK(td->td_proc);
   91 
   92         do_map_wirefuture = FALSE;
   93         new = round_page((vm_offset_t)uap->nsize);
   94         vm_map_lock(map);
   95 
   96         base = round_page((vm_offset_t) vm->vm_daddr);
   97         old = base + ctob(vm->vm_dsize);
   98         if (new > base) {
   99                 /*
  100                  * Check the resource limit, but allow a process to reduce
  101                  * its usage, even if it remains over the limit.
  102                  */
  103                 if (new - base > datalim && new > old) {
  104                         error = ENOMEM;
  105                         goto done;
  106                 }
  107                 if (new > vm_map_max(map)) {
  108                         error = ENOMEM;
  109                         goto done;
  110                 }
  111         } else if (new < base) {
  112                 /*
  113                  * This is simply an invalid value.  If someone wants to
  114                  * do fancy address space manipulations, mmap and munmap
  115                  * can do most of what the user would want.
  116                  */
  117                 error = EINVAL;
  118                 goto done;
  119         }
  120         if (new > old) {
  121                 if (!old_mlock && map->flags & MAP_WIREFUTURE) {
  122                         if (ptoa(pmap_wired_count(map->pmap)) +
  123                             (new - old) > lmemlim) {
  124                                 error = ENOMEM;
  125                                 goto done;
  126                         }
  127                 }
  128                 if (map->size + (new - old) > vmemlim) {
  129                         error = ENOMEM;
  130                         goto done;
  131                 }
  132 #ifdef RACCT
  133                 if (racct_enable) {
  134                         PROC_LOCK(td->td_proc);
  135                         error = racct_set(td->td_proc, RACCT_DATA, new - base);
  136                         if (error != 0) {
  137                                 PROC_UNLOCK(td->td_proc);
  138                                 error = ENOMEM;
  139                                 goto done;
  140                         }
  141                         error = racct_set(td->td_proc, RACCT_VMEM,
  142                             map->size + (new - old));
  143                         if (error != 0) {
  144                                 racct_set_force(td->td_proc, RACCT_DATA,
  145                                     old - base);
  146                                 PROC_UNLOCK(td->td_proc);
  147                                 error = ENOMEM;
  148                                 goto done;
  149                         }
  150                         if (!old_mlock && map->flags & MAP_WIREFUTURE) {
  151                                 error = racct_set(td->td_proc, RACCT_MEMLOCK,
  152                                     ptoa(pmap_wired_count(map->pmap)) +
  153                                     (new - old));
  154                                 if (error != 0) {
  155                                         racct_set_force(td->td_proc, RACCT_DATA,
  156                                             old - base);
  157                                         racct_set_force(td->td_proc, RACCT_VMEM,
  158                                             map->size);
  159                                         PROC_UNLOCK(td->td_proc);
  160                                         error = ENOMEM;
  161                                         goto done;
  162                                 }
  163                         }
  164                         PROC_UNLOCK(td->td_proc);
  165                 }
  166 #endif
  167                 prot = VM_PROT_RW;
  168 #ifdef COMPAT_FREEBSD32
  169 #if defined(__amd64__) || defined(__ia64__)
  170                 if (i386_read_exec && SV_PROC_FLAG(td->td_proc, SV_ILP32))
  171                         prot |= VM_PROT_EXECUTE;
  172 #endif
  173 #endif
  174                 rv = vm_map_insert(map, NULL, 0, old, new, prot, VM_PROT_ALL, 0);
  175                 if (rv != KERN_SUCCESS) {
  176 #ifdef RACCT
  177                         if (racct_enable) {
  178                                 PROC_LOCK(td->td_proc);
  179                                 racct_set_force(td->td_proc,
  180                                     RACCT_DATA, old - base);
  181                                 racct_set_force(td->td_proc,
  182                                     RACCT_VMEM, map->size);
  183                                 if (!old_mlock && map->flags & MAP_WIREFUTURE) {
  184                                         racct_set_force(td->td_proc,
  185                                             RACCT_MEMLOCK,
  186                                             ptoa(pmap_wired_count(map->pmap)));
  187                                 }
  188                                 PROC_UNLOCK(td->td_proc);
  189                         }
  190 #endif
  191                         error = ENOMEM;
  192                         goto done;
  193                 }
  194                 vm->vm_dsize += btoc(new - old);
  195                 /*
  196                  * Handle the MAP_WIREFUTURE case for legacy applications,
  197                  * by marking the newly mapped range of pages as wired.
  198                  * We are not required to perform a corresponding
  199                  * vm_map_unwire() before vm_map_delete() below, as
  200                  * it will forcibly unwire the pages in the range.
  201                  *
  202                  * XXX If the pages cannot be wired, no error is returned.
  203                  */
  204                 if ((map->flags & MAP_WIREFUTURE) == MAP_WIREFUTURE) {
  205                         if (bootverbose)
  206                                 printf("obreak: MAP_WIREFUTURE set\n");
  207                         do_map_wirefuture = TRUE;
  208                 }
  209         } else if (new < old) {
  210                 rv = vm_map_delete(map, new, old);
  211                 if (rv != KERN_SUCCESS) {
  212                         error = ENOMEM;
  213                         goto done;
  214                 }
  215                 vm->vm_dsize -= btoc(old - new);
  216 #ifdef RACCT
  217                 if (racct_enable) {
  218                         PROC_LOCK(td->td_proc);
  219                         racct_set_force(td->td_proc, RACCT_DATA, new - base);
  220                         racct_set_force(td->td_proc, RACCT_VMEM, map->size);
  221                         if (!old_mlock && map->flags & MAP_WIREFUTURE) {
  222                                 racct_set_force(td->td_proc, RACCT_MEMLOCK,
  223                                     ptoa(pmap_wired_count(map->pmap)));
  224                         }
  225                         PROC_UNLOCK(td->td_proc);
  226                 }
  227 #endif
  228         }
  229 done:
  230         vm_map_unlock(map);
  231 
  232         if (do_map_wirefuture)
  233                 (void) vm_map_wire(map, old, new,
  234                     VM_MAP_WIRE_USER|VM_MAP_WIRE_NOHOLES);
  235 
  236         return (error);
  237 }
  238 
  239 #ifndef _SYS_SYSPROTO_H_
  240 struct ovadvise_args {
  241         int anom;
  242 };
  243 #endif
  244 
  245 /*
  246  * MPSAFE
  247  */
  248 /* ARGSUSED */
  249 int
  250 sys_ovadvise(td, uap)
  251         struct thread *td;
  252         struct ovadvise_args *uap;
  253 {
  254         /* START_GIANT_OPTIONAL */
  255         /* END_GIANT_OPTIONAL */
  256         return (EINVAL);
  257 }

Cache object: fdf44088996827d935a48b869395056f


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