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6cde7a165f
1) The vnode pager wasn't properly tracking the file size due to "size" being page rounded in some cases and not in others. This sometimes resulted in corrupted files. First noticed by Terry Lambert. Fixed by changing the "size" pager_alloc parameter to be a 64bit byte value (as opposed to a 32bit page index) and changing the pagers and their callers to deal with this properly. 2) Fixed a bogus type cast in round_page() and trunc_page() that caused some 64bit offsets and sizes to be scrambled. Removing the cast required adding casts at a few dozen callers. There may be problems with other bogus casts in close-by macros. A quick check seemed to indicate that those were okay, however.
131 lines
3.8 KiB
C
131 lines
3.8 KiB
C
/*
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* Copyright (c) 1988 University of Utah.
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: Utah $Hdr: vm_unix.c 1.1 89/11/07$
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*
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* @(#)vm_unix.c 8.1 (Berkeley) 6/11/93
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* $Id: vm_unix.c,v 1.16 1997/11/06 19:29:57 phk Exp $
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*/
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/*
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* Traditional sbrk/grow interface to VM
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*/
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#include <sys/param.h>
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#include <sys/sysproto.h>
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#include <sys/proc.h>
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#include <sys/resourcevar.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <sys/lock.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/swap_pager.h>
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#include <vm/vm_prot.h>
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#ifndef _SYS_SYSPROTO_H_
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struct obreak_args {
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char *nsize;
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};
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#endif
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/* ARGSUSED */
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int
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obreak(p, uap)
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struct proc *p;
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struct obreak_args *uap;
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{
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register struct vmspace *vm = p->p_vmspace;
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vm_offset_t new, old, base;
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int rv;
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base = round_page((vm_offset_t) vm->vm_daddr);
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new = round_page((vm_offset_t)uap->nsize);
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if (new > base) {
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if ((new - base) > (unsigned) p->p_rlimit[RLIMIT_DATA].rlim_cur)
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return ENOMEM;
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if (new >= VM_MAXUSER_ADDRESS)
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return (ENOMEM);
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} else if (new < base) {
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/*
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* This is simply an invalid value. If someone wants to
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* do fancy address space manipulations, mmap and munmap
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* can do most of what the user would want.
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*/
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return EINVAL;
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}
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old = base + ctob(vm->vm_dsize);
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if (new > old) {
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vm_size_t diff;
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if (swap_pager_full) {
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return (ENOMEM);
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}
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diff = new - old;
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rv = vm_map_find(&vm->vm_map, NULL, 0, &old, diff, FALSE,
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VM_PROT_ALL, VM_PROT_ALL, 0);
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if (rv != KERN_SUCCESS) {
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return (ENOMEM);
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}
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vm->vm_dsize += btoc(diff);
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} else if (new < old) {
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rv = vm_map_remove(&vm->vm_map, new, old);
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if (rv != KERN_SUCCESS) {
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return (ENOMEM);
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}
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vm->vm_dsize -= btoc(old - new);
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}
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return (0);
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}
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#ifndef _SYS_SYSPROTO_H_
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struct ovadvise_args {
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int anom;
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};
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#endif
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/* ARGSUSED */
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int
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ovadvise(p, uap)
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struct proc *p;
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struct ovadvise_args *uap;
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{
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return (EINVAL);
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}
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