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/* Pagemap manipulation for pager library
Copyright (C) 1994, 1997, 1999, 2000 Free Software Foundation
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "priv.h"
#include <string.h>
/* Grow the pagemap of pager P as necessary to deal with address OFF */
error_t
_pager_pagemap_resize (struct pager *p, vm_address_t off)
{
error_t err = 0;
off /= __vm_page_size;
if (p->pagemapsize < off)
{
void *newaddr;
vm_size_t newsize = round_page (off);
newaddr = mmap (0, newsize * sizeof (*p->pagemap),
PROT_READ|PROT_WRITE, MAP_ANON, 0, 0);
err = (newaddr == (void *) -1) ? errno : 0;
if (! err)
{
memcpy (newaddr, p->pagemap, p->pagemapsize * sizeof (*p->pagemap));
munmap (p->pagemap, p->pagemapsize * sizeof (*p->pagemap));
p->pagemap = newaddr;
p->pagemapsize = newsize;
}
}
return err;
}
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