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/* Map the disk image and handle faults accessing it.
Copyright (C) 1996 Free Software Foundation, Inc.
Written by Roland McGrath.
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. */
#ifndef _HURD_DISKFS_PAGER_H
#define _HURD_DISKFS_PAGER_H 1
#include <hurd/pager.h>
#include <hurd/ports.h>
#include <setjmp.h>
#include <cthreads.h>
#include <errno.h>
#include <assert.h>
#include <stdlib.h>
/* Set up the three variables below and prepare a signal preempter
so that the `diskfs_catch_exception' macro below works.
INFO and MAY_CACHE are passed to `pager_create'. */
extern void disk_pager_setup (struct user_pager_info *info, int may_cache);
extern struct port_bucket *pager_bucket; /* Ports bucket used by pagers. */
extern struct pager *disk_pager; /* Pager backing to the disk. */
extern void *disk_image; /* Region mapping entire disk from it. */
struct disk_image_user
{
jmp_buf env;
struct disk_image_user *next;
};
/* Return zero now. Return a second time with a nonzero error_t
if this thread faults accessing `disk_image' before calling
`diskfs_end_catch_exception' (below). */
#define diskfs_catch_exception() \
({ \
struct disk_image_user *diu = alloca (sizeof *diu); \
error_t err; \
diu->next = (void *) cthread_data (cthread_self ()); \
err = setjmp (diu->env); \
if (err == 0) \
cthread_set_data (cthread_self (), diu); \
err; \
})
/* No longer handle faults on `disk_image' in this thread.
Any unexpected fault hereafter will crash the program. */
#define diskfs_end_catch_exception() \
({ \
struct disk_image_user *diu = (void *) cthread_data (cthread_self ()); \
cthread_set_data (cthread_self (), diu->next); \
})
#endif /* hurd/diskfs-pager.h */
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