diff options
Diffstat (limited to 'libpager/pagemap.c')
| -rw-r--r-- | libpager/pagemap.c | 38 |
1 files changed, 23 insertions, 15 deletions
diff --git a/libpager/pagemap.c b/libpager/pagemap.c index 2adbcc0e..b8b3362c 100644 --- a/libpager/pagemap.c +++ b/libpager/pagemap.c @@ -1,5 +1,5 @@ /* Pagemap manipulation for pager library - Copyright (C) 1994 Free Software Foundation + 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 @@ -19,21 +19,29 @@ #include <string.h> /* Grow the pagemap of pager P as necessary to deal with address OFF */ -void -_pager_pagemap_resize (struct pager *p, - vm_address_t off) +error_t +_pager_pagemap_resize (struct pager *p, vm_address_t off) { - void *newaddr; - int newsize; + error_t err = 0; off /= __vm_page_size; - if (p->pagemapsize >= off) - return; - - newsize = round_page (off); - vm_allocate (mach_task_self (), (u_int *)&newaddr, newsize, 1); - bcopy (p->pagemap, newaddr, p->pagemapsize); - vm_deallocate (mach_task_self (), (u_int)p->pagemap, p->pagemapsize); - p->pagemap = newaddr; - p->pagemapsize = newsize; + + if (p->pagemapsize < off) + { + void *newaddr; + int 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) + { + bcopy (p->pagemap, newaddr, p->pagemapsize * sizeof (*p->pagemap)); + munmap (p->pagemap, p->pagemapsize * sizeof (*p->pagemap)); + p->pagemap = newaddr; + p->pagemapsize = newsize; + } + } + + return err; } |