2005-04-17 02:20:36 +04:00
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/*
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* linux/kernel/power/swsusp.c
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*
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2005-10-31 01:59:58 +03:00
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* This file provides code to write suspend image to swap and read it back.
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2005-04-17 02:20:36 +04:00
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*
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* Copyright (C) 1998-2001 Gabor Kuti <seasons@fornax.hu>
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2005-10-31 01:59:56 +03:00
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* Copyright (C) 1998,2001-2005 Pavel Machek <pavel@suse.cz>
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2005-04-17 02:20:36 +04:00
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*
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* This file is released under the GPLv2.
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*
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* I'd like to thank the following people for their work:
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2005-06-26 01:55:12 +04:00
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*
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2005-04-17 02:20:36 +04:00
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* Pavel Machek <pavel@ucw.cz>:
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* Modifications, defectiveness pointing, being with me at the very beginning,
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* suspend to swap space, stop all tasks. Port to 2.4.18-ac and 2.5.17.
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*
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2005-06-26 01:55:12 +04:00
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* Steve Doddi <dirk@loth.demon.co.uk>:
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2005-04-17 02:20:36 +04:00
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* Support the possibility of hardware state restoring.
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*
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* Raph <grey.havens@earthling.net>:
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* Support for preserving states of network devices and virtual console
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* (including X and svgatextmode)
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*
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* Kurt Garloff <garloff@suse.de>:
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* Straightened the critical function in order to prevent compilers from
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* playing tricks with local variables.
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*
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* Andreas Mohr <a.mohr@mailto.de>
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*
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* Alex Badea <vampire@go.ro>:
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* Fixed runaway init
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*
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2006-01-06 11:13:05 +03:00
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* Rafael J. Wysocki <rjw@sisk.pl>
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* Added the swap map data structure and reworked the handling of swap
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*
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2005-04-17 02:20:36 +04:00
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* More state savers are welcome. Especially for the scsi layer...
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*
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* For TODOs,FIXMEs also look in Documentation/power/swsusp.txt
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*/
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/suspend.h>
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#include <linux/smp_lock.h>
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#include <linux/file.h>
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#include <linux/utsname.h>
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#include <linux/version.h>
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#include <linux/delay.h>
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#include <linux/bitops.h>
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#include <linux/spinlock.h>
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#include <linux/genhd.h>
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#include <linux/kernel.h>
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#include <linux/major.h>
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#include <linux/swap.h>
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#include <linux/pm.h>
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#include <linux/device.h>
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#include <linux/buffer_head.h>
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#include <linux/swapops.h>
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#include <linux/bootmem.h>
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#include <linux/syscalls.h>
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#include <linux/highmem.h>
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#include <linux/bio.h>
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#include <asm/uaccess.h>
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#include <asm/mmu_context.h>
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#include <asm/pgtable.h>
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#include <asm/tlbflush.h>
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#include <asm/io.h>
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#include "power.h"
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2006-01-06 11:15:56 +03:00
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/*
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2006-02-01 14:05:07 +03:00
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* Preferred image size in bytes (tunable via /sys/power/image_size).
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2006-01-06 11:15:56 +03:00
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* When it is set to N, swsusp will do its best to ensure the image
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2006-02-01 14:05:07 +03:00
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* size will not exceed N bytes, but if that is impossible, it will
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2006-01-06 11:15:56 +03:00
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* try to create the smallest image possible.
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*/
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2006-02-01 14:05:07 +03:00
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unsigned long image_size = 500 * 1024 * 1024;
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2006-01-06 11:15:56 +03:00
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2006-03-23 13:59:59 +03:00
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int in_suspend __nosavedata = 0;
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2005-11-09 08:34:41 +03:00
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#ifdef CONFIG_HIGHMEM
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2006-01-06 11:13:46 +03:00
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unsigned int count_highmem_pages(void);
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2005-11-09 08:34:41 +03:00
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int save_highmem(void);
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int restore_highmem(void);
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#else
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static int save_highmem(void) { return 0; }
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static int restore_highmem(void) { return 0; }
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2006-01-06 11:13:46 +03:00
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static unsigned int count_highmem_pages(void) { return 0; }
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2005-11-09 08:34:41 +03:00
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#endif
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2005-04-17 02:20:36 +04:00
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extern char resume_file[];
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#define SWSUSP_SIG "S1SUSPEND"
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static struct swsusp_header {
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2006-01-06 11:12:24 +03:00
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char reserved[PAGE_SIZE - 20 - sizeof(swp_entry_t)];
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2006-01-06 11:17:58 +03:00
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swp_entry_t image;
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2005-04-17 02:20:36 +04:00
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char orig_sig[10];
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char sig[10];
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} __attribute__((packed, aligned(PAGE_SIZE))) swsusp_header;
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/*
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* Saving part...
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*/
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2006-01-06 11:17:16 +03:00
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static unsigned short root_swap = 0xffff;
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2005-04-17 02:20:36 +04:00
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2006-01-06 11:17:58 +03:00
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static int mark_swapfiles(swp_entry_t start)
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2005-04-17 02:20:36 +04:00
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{
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int error;
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2005-06-26 01:55:12 +04:00
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rw_swap_page_sync(READ,
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2005-04-17 02:20:36 +04:00
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swp_entry(root_swap, 0),
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virt_to_page((unsigned long)&swsusp_header));
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if (!memcmp("SWAP-SPACE",swsusp_header.sig, 10) ||
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!memcmp("SWAPSPACE2",swsusp_header.sig, 10)) {
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memcpy(swsusp_header.orig_sig,swsusp_header.sig, 10);
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memcpy(swsusp_header.sig,SWSUSP_SIG, 10);
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2006-01-06 11:17:58 +03:00
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swsusp_header.image = start;
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2005-06-26 01:55:12 +04:00
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error = rw_swap_page_sync(WRITE,
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2005-04-17 02:20:36 +04:00
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swp_entry(root_swap, 0),
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virt_to_page((unsigned long)
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&swsusp_header));
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} else {
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pr_debug("swsusp: Partition is not swap space.\n");
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error = -ENODEV;
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}
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return error;
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}
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2006-03-23 13:59:59 +03:00
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/**
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* swsusp_swap_check - check if the resume device is a swap device
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* and get its index (if so)
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2005-04-17 02:20:36 +04:00
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*/
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static int swsusp_swap_check(void) /* This is called before saving image */
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{
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2006-03-23 13:59:59 +03:00
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int res = swap_type_of(swsusp_resume_device);
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if (res >= 0) {
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root_swap = res;
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return 0;
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2006-01-06 11:17:16 +03:00
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}
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2006-03-23 13:59:59 +03:00
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return res;
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2005-04-17 02:20:36 +04:00
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}
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/**
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2006-03-23 13:59:59 +03:00
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* The bitmap is used for tracing allocated swap pages
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2005-04-17 02:20:36 +04:00
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*
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2006-03-23 13:59:59 +03:00
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* The entire bitmap consists of a number of bitmap_page
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* structures linked with the help of the .next member.
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* Thus each page can be allocated individually, so we only
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* need to make 0-order memory allocations to create
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* the bitmap.
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2005-04-17 02:20:36 +04:00
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*/
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2006-03-23 13:59:59 +03:00
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#define BITMAP_PAGE_SIZE (PAGE_SIZE - sizeof(void *))
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#define BITMAP_PAGE_CHUNKS (BITMAP_PAGE_SIZE / sizeof(long))
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#define BITS_PER_CHUNK (sizeof(long) * 8)
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#define BITMAP_PAGE_BITS (BITMAP_PAGE_CHUNKS * BITS_PER_CHUNK)
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struct bitmap_page {
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unsigned long chunks[BITMAP_PAGE_CHUNKS];
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struct bitmap_page *next;
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};
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2005-04-17 02:20:36 +04:00
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/**
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2006-03-23 13:59:59 +03:00
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* The following functions are used for tracing the allocated
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* swap pages, so that they can be freed in case of an error.
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2006-01-06 11:13:05 +03:00
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*
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2006-03-23 13:59:59 +03:00
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* The functions operate on a linked bitmap structure defined
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* above
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2005-04-17 02:20:36 +04:00
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*/
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2006-01-06 11:13:05 +03:00
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2006-03-23 13:59:59 +03:00
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static void free_bitmap(struct bitmap_page *bitmap)
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2005-04-17 02:20:36 +04:00
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{
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2006-03-23 13:59:59 +03:00
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struct bitmap_page *bp;
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2005-04-17 02:20:36 +04:00
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2006-03-23 13:59:59 +03:00
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while (bitmap) {
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bp = bitmap->next;
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free_page((unsigned long)bitmap);
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bitmap = bp;
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2006-01-06 11:13:05 +03:00
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}
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}
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2006-03-23 13:59:59 +03:00
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static struct bitmap_page *alloc_bitmap(unsigned int nr_bits)
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2006-01-06 11:13:05 +03:00
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{
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2006-03-23 13:59:59 +03:00
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struct bitmap_page *bitmap, *bp;
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unsigned int n;
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2006-01-06 11:13:05 +03:00
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2006-03-23 13:59:59 +03:00
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if (!nr_bits)
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2006-01-06 11:13:05 +03:00
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return NULL;
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2006-03-23 13:59:59 +03:00
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bitmap = (struct bitmap_page *)get_zeroed_page(GFP_KERNEL);
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bp = bitmap;
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for (n = BITMAP_PAGE_BITS; n < nr_bits; n += BITMAP_PAGE_BITS) {
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bp->next = (struct bitmap_page *)get_zeroed_page(GFP_KERNEL);
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bp = bp->next;
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if (!bp) {
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free_bitmap(bitmap);
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2006-01-06 11:13:05 +03:00
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return NULL;
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}
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2005-04-17 02:20:36 +04:00
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}
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2006-03-23 13:59:59 +03:00
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return bitmap;
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2005-04-17 02:20:36 +04:00
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}
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2006-03-23 13:59:59 +03:00
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static int bitmap_set(struct bitmap_page *bitmap, unsigned long bit)
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2005-04-17 02:20:36 +04:00
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{
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2006-03-23 13:59:59 +03:00
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unsigned int n;
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n = BITMAP_PAGE_BITS;
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while (bitmap && n <= bit) {
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n += BITMAP_PAGE_BITS;
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bitmap = bitmap->next;
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}
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if (!bitmap)
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return -EINVAL;
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n -= BITMAP_PAGE_BITS;
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bit -= n;
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n = 0;
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while (bit >= BITS_PER_CHUNK) {
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bit -= BITS_PER_CHUNK;
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n++;
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2006-01-06 11:13:05 +03:00
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}
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2006-03-23 13:59:59 +03:00
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bitmap->chunks[n] |= (1UL << bit);
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return 0;
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2006-01-06 11:13:05 +03:00
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}
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2005-04-17 02:20:36 +04:00
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2006-03-23 13:59:59 +03:00
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static unsigned long alloc_swap_page(int swap, struct bitmap_page *bitmap)
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2006-01-06 11:13:05 +03:00
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{
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2006-03-23 13:59:59 +03:00
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unsigned long offset;
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offset = swp_offset(get_swap_page_of_type(swap));
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if (offset) {
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if (bitmap_set(bitmap, offset)) {
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swap_free(swp_entry(swap, offset));
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offset = 0;
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}
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2006-01-06 11:13:05 +03:00
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}
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2006-03-23 13:59:59 +03:00
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return offset;
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2006-01-06 11:13:05 +03:00
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}
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2005-04-17 02:20:36 +04:00
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2006-03-23 13:59:59 +03:00
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static void free_all_swap_pages(int swap, struct bitmap_page *bitmap)
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2006-01-06 11:13:05 +03:00
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{
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2006-03-23 13:59:59 +03:00
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unsigned int bit, n;
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unsigned long test;
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2006-01-06 11:13:05 +03:00
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2006-03-23 13:59:59 +03:00
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bit = 0;
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while (bitmap) {
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for (n = 0; n < BITMAP_PAGE_CHUNKS; n++)
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for (test = 1UL; test; test <<= 1) {
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if (bitmap->chunks[n] & test)
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swap_free(swp_entry(swap, bit));
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bit++;
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}
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bitmap = bitmap->next;
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2005-04-17 02:20:36 +04:00
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}
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2006-01-06 11:13:05 +03:00
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}
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/**
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2006-03-23 13:59:59 +03:00
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* write_page - Write one page to given swap location.
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* @buf: Address we're writing.
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* @offset: Offset of the swap page we're writing to.
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2006-01-06 11:13:05 +03:00
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*/
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2006-03-23 13:59:59 +03:00
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static int write_page(void *buf, unsigned long offset)
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2006-01-06 11:13:05 +03:00
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{
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2006-03-23 13:59:59 +03:00
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swp_entry_t entry;
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int error = -ENOSPC;
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2006-01-06 11:13:05 +03:00
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2006-03-23 13:59:59 +03:00
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if (offset) {
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entry = swp_entry(root_swap, offset);
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error = rw_swap_page_sync(WRITE, entry, virt_to_page(buf));
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2006-01-06 11:13:05 +03:00
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}
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2006-03-23 13:59:59 +03:00
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return error;
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2006-01-06 11:13:05 +03:00
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}
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2006-03-23 13:59:59 +03:00
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/*
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* The swap map is a data structure used for keeping track of each page
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* written to a swap partition. It consists of many swap_map_page
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* structures that contain each an array of MAP_PAGE_SIZE swap entries.
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* These structures are stored on the swap and linked together with the
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* help of the .next_swap member.
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*
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* The swap map is created during suspend. The swap map pages are
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* allocated and populated one at a time, so we only need one memory
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* page to set up the entire structure.
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*
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* During resume we also only need to use one swap_map_page structure
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* at a time.
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*/
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#define MAP_PAGE_ENTRIES (PAGE_SIZE / sizeof(long) - 1)
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struct swap_map_page {
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unsigned long entries[MAP_PAGE_ENTRIES];
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unsigned long next_swap;
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};
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2006-01-06 11:13:05 +03:00
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/**
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2006-03-23 13:59:59 +03:00
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* The swap_map_handle structure is used for handling swap in
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2006-01-06 11:13:05 +03:00
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* a file-alike way
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*/
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struct swap_map_handle {
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|
|
struct swap_map_page *cur;
|
2006-03-23 13:59:59 +03:00
|
|
|
unsigned long cur_swap;
|
|
|
|
struct bitmap_page *bitmap;
|
2006-01-06 11:13:05 +03:00
|
|
|
unsigned int k;
|
|
|
|
};
|
|
|
|
|
2006-03-23 13:59:59 +03:00
|
|
|
static void release_swap_writer(struct swap_map_handle *handle)
|
2006-01-06 11:13:05 +03:00
|
|
|
{
|
2006-03-23 13:59:59 +03:00
|
|
|
if (handle->cur)
|
|
|
|
free_page((unsigned long)handle->cur);
|
|
|
|
handle->cur = NULL;
|
|
|
|
if (handle->bitmap)
|
|
|
|
free_bitmap(handle->bitmap);
|
|
|
|
handle->bitmap = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int get_swap_writer(struct swap_map_handle *handle)
|
|
|
|
{
|
|
|
|
handle->cur = (struct swap_map_page *)get_zeroed_page(GFP_KERNEL);
|
|
|
|
if (!handle->cur)
|
|
|
|
return -ENOMEM;
|
|
|
|
handle->bitmap = alloc_bitmap(count_swap_pages(root_swap, 0));
|
|
|
|
if (!handle->bitmap) {
|
|
|
|
release_swap_writer(handle);
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
handle->cur_swap = alloc_swap_page(root_swap, handle->bitmap);
|
|
|
|
if (!handle->cur_swap) {
|
|
|
|
release_swap_writer(handle);
|
|
|
|
return -ENOSPC;
|
|
|
|
}
|
2006-01-06 11:13:05 +03:00
|
|
|
handle->k = 0;
|
2006-03-23 13:59:59 +03:00
|
|
|
return 0;
|
2006-01-06 11:13:05 +03:00
|
|
|
}
|
|
|
|
|
2006-03-23 13:59:59 +03:00
|
|
|
static int swap_write_page(struct swap_map_handle *handle, void *buf)
|
2006-01-06 11:13:05 +03:00
|
|
|
{
|
|
|
|
int error;
|
2006-03-23 13:59:59 +03:00
|
|
|
unsigned long offset;
|
2006-01-06 11:13:05 +03:00
|
|
|
|
2006-03-23 13:59:59 +03:00
|
|
|
if (!handle->cur)
|
|
|
|
return -EINVAL;
|
|
|
|
offset = alloc_swap_page(root_swap, handle->bitmap);
|
|
|
|
error = write_page(buf, offset);
|
2006-01-06 11:13:05 +03:00
|
|
|
if (error)
|
|
|
|
return error;
|
2006-03-23 13:59:59 +03:00
|
|
|
handle->cur->entries[handle->k++] = offset;
|
|
|
|
if (handle->k >= MAP_PAGE_ENTRIES) {
|
|
|
|
offset = alloc_swap_page(root_swap, handle->bitmap);
|
|
|
|
if (!offset)
|
|
|
|
return -ENOSPC;
|
|
|
|
handle->cur->next_swap = offset;
|
|
|
|
error = write_page(handle->cur, handle->cur_swap);
|
|
|
|
if (error)
|
|
|
|
return error;
|
|
|
|
memset(handle->cur, 0, PAGE_SIZE);
|
|
|
|
handle->cur_swap = offset;
|
2006-01-06 11:13:05 +03:00
|
|
|
handle->k = 0;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2006-03-23 13:59:59 +03:00
|
|
|
static int flush_swap_writer(struct swap_map_handle *handle)
|
|
|
|
{
|
|
|
|
if (handle->cur && handle->cur_swap)
|
|
|
|
return write_page(handle->cur, handle->cur_swap);
|
|
|
|
else
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
2006-01-06 11:13:05 +03:00
|
|
|
/**
|
2006-03-23 13:59:59 +03:00
|
|
|
* save_image - save the suspend image data
|
2006-01-06 11:13:05 +03:00
|
|
|
*/
|
|
|
|
|
2006-03-23 13:59:59 +03:00
|
|
|
static int save_image(struct swap_map_handle *handle,
|
|
|
|
struct snapshot_handle *snapshot,
|
|
|
|
unsigned int nr_pages)
|
2006-01-06 11:13:05 +03:00
|
|
|
{
|
|
|
|
unsigned int m;
|
2006-03-23 13:59:59 +03:00
|
|
|
int ret;
|
2006-01-06 11:13:05 +03:00
|
|
|
int error = 0;
|
|
|
|
|
|
|
|
printk("Saving image data pages (%u pages) ... ", nr_pages);
|
|
|
|
m = nr_pages / 100;
|
|
|
|
if (!m)
|
|
|
|
m = 1;
|
|
|
|
nr_pages = 0;
|
2006-03-23 13:59:59 +03:00
|
|
|
do {
|
|
|
|
ret = snapshot_read_next(snapshot, PAGE_SIZE);
|
|
|
|
if (ret > 0) {
|
|
|
|
error = swap_write_page(handle, data_of(*snapshot));
|
|
|
|
if (error)
|
|
|
|
break;
|
|
|
|
if (!(nr_pages % m))
|
|
|
|
printk("\b\b\b\b%3d%%", nr_pages / m);
|
|
|
|
nr_pages++;
|
|
|
|
}
|
|
|
|
} while (ret > 0);
|
2006-01-06 11:13:05 +03:00
|
|
|
if (!error)
|
|
|
|
printk("\b\b\b\bdone\n");
|
2005-04-17 02:20:36 +04:00
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
2005-11-09 08:34:41 +03:00
|
|
|
/**
|
|
|
|
* enough_swap - Make sure we have enough swap to save the image.
|
|
|
|
*
|
|
|
|
* Returns TRUE or FALSE after checking the total amount of swap
|
2006-01-06 11:17:16 +03:00
|
|
|
* space avaiable from the resume partition.
|
2005-11-09 08:34:41 +03:00
|
|
|
*/
|
|
|
|
|
|
|
|
static int enough_swap(unsigned int nr_pages)
|
|
|
|
{
|
2006-03-23 13:59:59 +03:00
|
|
|
unsigned int free_swap = count_swap_pages(root_swap, 1);
|
2005-11-09 08:34:41 +03:00
|
|
|
|
2006-01-06 11:17:16 +03:00
|
|
|
pr_debug("swsusp: free swap pages: %u\n", free_swap);
|
|
|
|
return free_swap > (nr_pages + PAGES_FOR_IO +
|
2005-11-09 08:34:41 +03:00
|
|
|
(nr_pages + PBES_PER_PAGE - 1) / PBES_PER_PAGE);
|
|
|
|
}
|
|
|
|
|
2005-04-17 02:20:36 +04:00
|
|
|
/**
|
2006-01-06 11:17:16 +03:00
|
|
|
* swsusp_write - Write entire image and metadata.
|
|
|
|
*
|
|
|
|
* It is important _NOT_ to umount filesystems at this point. We want
|
|
|
|
* them synced (in case something goes wrong) but we DO not want to mark
|
|
|
|
* filesystem clean: it is not. (And it does not matter, if we resume
|
|
|
|
* correctly, we'll mark system clean, anyway.)
|
2005-04-17 02:20:36 +04:00
|
|
|
*/
|
2006-01-06 11:17:16 +03:00
|
|
|
|
2006-03-23 13:59:59 +03:00
|
|
|
int swsusp_write(void)
|
2005-04-17 02:20:36 +04:00
|
|
|
{
|
2006-01-06 11:13:05 +03:00
|
|
|
struct swap_map_handle handle;
|
2006-03-23 13:59:59 +03:00
|
|
|
struct snapshot_handle snapshot;
|
|
|
|
struct swsusp_info *header;
|
|
|
|
unsigned long start;
|
2005-04-17 02:20:36 +04:00
|
|
|
int error;
|
|
|
|
|
2006-01-06 11:17:16 +03:00
|
|
|
if ((error = swsusp_swap_check())) {
|
|
|
|
printk(KERN_ERR "swsusp: Cannot find swap device, try swapon -a.\n");
|
|
|
|
return error;
|
|
|
|
}
|
2006-03-23 13:59:59 +03:00
|
|
|
memset(&snapshot, 0, sizeof(struct snapshot_handle));
|
|
|
|
error = snapshot_read_next(&snapshot, PAGE_SIZE);
|
|
|
|
if (error < PAGE_SIZE)
|
|
|
|
return error < 0 ? error : -EFAULT;
|
|
|
|
header = (struct swsusp_info *)data_of(snapshot);
|
|
|
|
if (!enough_swap(header->pages)) {
|
2005-11-09 08:34:41 +03:00
|
|
|
printk(KERN_ERR "swsusp: Not enough free swap\n");
|
|
|
|
return -ENOSPC;
|
|
|
|
}
|
2006-03-23 13:59:59 +03:00
|
|
|
error = get_swap_writer(&handle);
|
|
|
|
if (!error) {
|
|
|
|
start = handle.cur_swap;
|
|
|
|
error = swap_write_page(&handle, header);
|
|
|
|
}
|
2006-01-06 11:13:05 +03:00
|
|
|
if (!error)
|
2006-03-23 13:59:59 +03:00
|
|
|
error = save_image(&handle, &snapshot, header->pages - 1);
|
|
|
|
if (!error) {
|
|
|
|
flush_swap_writer(&handle);
|
|
|
|
printk("S");
|
|
|
|
error = mark_swapfiles(swp_entry(root_swap, start));
|
|
|
|
printk("|\n");
|
|
|
|
}
|
2006-01-06 11:13:05 +03:00
|
|
|
if (error)
|
2006-03-23 13:59:59 +03:00
|
|
|
free_all_swap_pages(root_swap, handle.bitmap);
|
|
|
|
release_swap_writer(&handle);
|
2005-04-17 02:20:36 +04:00
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
2006-01-06 11:13:46 +03:00
|
|
|
/**
|
|
|
|
* swsusp_shrink_memory - Try to free as much memory as needed
|
|
|
|
*
|
|
|
|
* ... but do not OOM-kill anyone
|
|
|
|
*
|
|
|
|
* Notice: all userland should be stopped before it is called, or
|
|
|
|
* livelock is possible.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#define SHRINK_BITE 10000
|
|
|
|
|
|
|
|
int swsusp_shrink_memory(void)
|
|
|
|
{
|
2006-01-06 11:15:22 +03:00
|
|
|
long size, tmp;
|
2006-01-06 11:13:46 +03:00
|
|
|
struct zone *zone;
|
|
|
|
unsigned long pages = 0;
|
|
|
|
unsigned int i = 0;
|
|
|
|
char *p = "-\\|/";
|
|
|
|
|
|
|
|
printk("Shrinking memory... ");
|
|
|
|
do {
|
2006-01-06 11:15:22 +03:00
|
|
|
size = 2 * count_highmem_pages();
|
|
|
|
size += size / 50 + count_data_pages();
|
|
|
|
size += (size + PBES_PER_PAGE - 1) / PBES_PER_PAGE +
|
2006-01-06 11:13:46 +03:00
|
|
|
PAGES_FOR_IO;
|
2006-01-06 11:15:22 +03:00
|
|
|
tmp = size;
|
2006-01-06 11:13:46 +03:00
|
|
|
for_each_zone (zone)
|
|
|
|
if (!is_highmem(zone))
|
|
|
|
tmp -= zone->free_pages;
|
|
|
|
if (tmp > 0) {
|
|
|
|
tmp = shrink_all_memory(SHRINK_BITE);
|
|
|
|
if (!tmp)
|
|
|
|
return -ENOMEM;
|
|
|
|
pages += tmp;
|
2006-02-01 14:05:07 +03:00
|
|
|
} else if (size > image_size / PAGE_SIZE) {
|
2006-01-06 11:15:22 +03:00
|
|
|
tmp = shrink_all_memory(SHRINK_BITE);
|
|
|
|
pages += tmp;
|
2006-01-06 11:13:46 +03:00
|
|
|
}
|
|
|
|
printk("\b%c", p[i++%4]);
|
|
|
|
} while (tmp > 0);
|
|
|
|
printk("\bdone (%lu pages freed)\n", pages);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2005-04-17 02:20:36 +04:00
|
|
|
int swsusp_suspend(void)
|
|
|
|
{
|
|
|
|
int error;
|
2005-11-09 08:34:41 +03:00
|
|
|
|
2005-04-17 02:20:36 +04:00
|
|
|
if ((error = arch_prepare_suspend()))
|
|
|
|
return error;
|
|
|
|
local_irq_disable();
|
|
|
|
/* At this point, device_suspend() has been called, but *not*
|
|
|
|
* device_power_down(). We *must* device_power_down() now.
|
|
|
|
* Otherwise, drivers for some devices (e.g. interrupt controllers)
|
|
|
|
* become desynchronized with the actual state of the hardware
|
|
|
|
* at resume time, and evil weirdness ensues.
|
|
|
|
*/
|
|
|
|
if ((error = device_power_down(PMSG_FREEZE))) {
|
2005-09-04 02:57:05 +04:00
|
|
|
printk(KERN_ERR "Some devices failed to power down, aborting suspend\n");
|
2005-11-09 08:34:41 +03:00
|
|
|
goto Enable_irqs;
|
2005-04-17 02:20:36 +04:00
|
|
|
}
|
2005-07-08 04:56:44 +04:00
|
|
|
|
2005-11-09 08:34:41 +03:00
|
|
|
if ((error = save_highmem())) {
|
|
|
|
printk(KERN_ERR "swsusp: Not enough free pages for highmem\n");
|
|
|
|
goto Restore_highmem;
|
2005-07-08 04:56:44 +04:00
|
|
|
}
|
|
|
|
|
2005-04-17 02:20:36 +04:00
|
|
|
save_processor_state();
|
|
|
|
if ((error = swsusp_arch_suspend()))
|
2005-09-04 02:57:05 +04:00
|
|
|
printk(KERN_ERR "Error %d suspending\n", error);
|
2005-04-17 02:20:36 +04:00
|
|
|
/* Restore control flow magically appears here */
|
|
|
|
restore_processor_state();
|
2005-11-09 08:34:41 +03:00
|
|
|
Restore_highmem:
|
2005-04-17 02:20:36 +04:00
|
|
|
restore_highmem();
|
|
|
|
device_power_up();
|
2005-11-09 08:34:41 +03:00
|
|
|
Enable_irqs:
|
2005-04-17 02:20:36 +04:00
|
|
|
local_irq_enable();
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
|
|
|
int swsusp_resume(void)
|
|
|
|
{
|
|
|
|
int error;
|
|
|
|
local_irq_disable();
|
|
|
|
if (device_power_down(PMSG_FREEZE))
|
|
|
|
printk(KERN_ERR "Some devices failed to power down, very bad\n");
|
|
|
|
/* We'll ignore saved state, but this gets preempt count (etc) right */
|
|
|
|
save_processor_state();
|
|
|
|
error = swsusp_arch_resume();
|
|
|
|
/* Code below is only ever reached in case of failure. Otherwise
|
|
|
|
* execution continues at place where swsusp_arch_suspend was called
|
|
|
|
*/
|
|
|
|
BUG_ON(!error);
|
2005-10-31 01:59:58 +03:00
|
|
|
/* The only reason why swsusp_arch_resume() can fail is memory being
|
|
|
|
* very tight, so we have to free it as soon as we can to avoid
|
|
|
|
* subsequent failures
|
|
|
|
*/
|
|
|
|
swsusp_free();
|
2005-04-17 02:20:36 +04:00
|
|
|
restore_processor_state();
|
|
|
|
restore_highmem();
|
2005-09-07 02:16:27 +04:00
|
|
|
touch_softlockup_watchdog();
|
2005-04-17 02:20:36 +04:00
|
|
|
device_power_up();
|
|
|
|
local_irq_enable();
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
2005-05-01 19:59:25 +04:00
|
|
|
/*
|
2005-04-17 02:20:36 +04:00
|
|
|
* Using bio to read from swap.
|
|
|
|
* This code requires a bit more work than just using buffer heads
|
|
|
|
* but, it is the recommended way for 2.5/2.6.
|
|
|
|
* The following are to signal the beginning and end of I/O. Bios
|
|
|
|
* finish asynchronously, while we want them to happen synchronously.
|
|
|
|
* A simple atomic_t, and a wait loop take care of this problem.
|
|
|
|
*/
|
|
|
|
|
|
|
|
static atomic_t io_done = ATOMIC_INIT(0);
|
|
|
|
|
2005-11-07 11:58:40 +03:00
|
|
|
static int end_io(struct bio *bio, unsigned int num, int err)
|
2005-04-17 02:20:36 +04:00
|
|
|
{
|
|
|
|
if (!test_bit(BIO_UPTODATE, &bio->bi_flags))
|
|
|
|
panic("I/O error reading memory image");
|
|
|
|
atomic_set(&io_done, 0);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2005-11-07 11:58:40 +03:00
|
|
|
static struct block_device *resume_bdev;
|
2005-04-17 02:20:36 +04:00
|
|
|
|
|
|
|
/**
|
|
|
|
* submit - submit BIO request.
|
|
|
|
* @rw: READ or WRITE.
|
|
|
|
* @off physical offset of page.
|
|
|
|
* @page: page we're reading or writing.
|
|
|
|
*
|
|
|
|
* Straight from the textbook - allocate and initialize the bio.
|
|
|
|
* If we're writing, make sure the page is marked as dirty.
|
|
|
|
* Then submit it and wait.
|
|
|
|
*/
|
|
|
|
|
2005-11-07 11:58:40 +03:00
|
|
|
static int submit(int rw, pgoff_t page_off, void *page)
|
2005-04-17 02:20:36 +04:00
|
|
|
{
|
|
|
|
int error = 0;
|
2005-11-07 11:58:40 +03:00
|
|
|
struct bio *bio;
|
2005-04-17 02:20:36 +04:00
|
|
|
|
|
|
|
bio = bio_alloc(GFP_ATOMIC, 1);
|
|
|
|
if (!bio)
|
|
|
|
return -ENOMEM;
|
|
|
|
bio->bi_sector = page_off * (PAGE_SIZE >> 9);
|
|
|
|
bio->bi_bdev = resume_bdev;
|
|
|
|
bio->bi_end_io = end_io;
|
|
|
|
|
|
|
|
if (bio_add_page(bio, virt_to_page(page), PAGE_SIZE, 0) < PAGE_SIZE) {
|
|
|
|
printk("swsusp: ERROR: adding page to bio at %ld\n",page_off);
|
|
|
|
error = -EFAULT;
|
|
|
|
goto Done;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
atomic_set(&io_done, 1);
|
|
|
|
submit_bio(rw | (1 << BIO_RW_SYNC), bio);
|
|
|
|
while (atomic_read(&io_done))
|
|
|
|
yield();
|
2006-02-07 23:58:22 +03:00
|
|
|
if (rw == READ)
|
|
|
|
bio_set_pages_dirty(bio);
|
2005-04-17 02:20:36 +04:00
|
|
|
Done:
|
|
|
|
bio_put(bio);
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
2005-11-07 11:58:40 +03:00
|
|
|
static int bio_read_page(pgoff_t page_off, void *page)
|
2005-04-17 02:20:36 +04:00
|
|
|
{
|
|
|
|
return submit(READ, page_off, page);
|
|
|
|
}
|
|
|
|
|
2005-11-07 11:58:40 +03:00
|
|
|
static int bio_write_page(pgoff_t page_off, void *page)
|
2005-04-17 02:20:36 +04:00
|
|
|
{
|
|
|
|
return submit(WRITE, page_off, page);
|
|
|
|
}
|
|
|
|
|
2006-01-06 11:13:05 +03:00
|
|
|
/**
|
|
|
|
* The following functions allow us to read data using a swap map
|
|
|
|
* in a file-alike way
|
|
|
|
*/
|
|
|
|
|
2006-03-23 13:59:59 +03:00
|
|
|
static void release_swap_reader(struct swap_map_handle *handle)
|
2006-01-06 11:13:05 +03:00
|
|
|
{
|
|
|
|
if (handle->cur)
|
|
|
|
free_page((unsigned long)handle->cur);
|
|
|
|
handle->cur = NULL;
|
|
|
|
}
|
|
|
|
|
2006-03-23 13:59:59 +03:00
|
|
|
static int get_swap_reader(struct swap_map_handle *handle,
|
2006-01-06 11:13:05 +03:00
|
|
|
swp_entry_t start)
|
|
|
|
{
|
|
|
|
int error;
|
|
|
|
|
|
|
|
if (!swp_offset(start))
|
|
|
|
return -EINVAL;
|
|
|
|
handle->cur = (struct swap_map_page *)get_zeroed_page(GFP_ATOMIC);
|
|
|
|
if (!handle->cur)
|
|
|
|
return -ENOMEM;
|
|
|
|
error = bio_read_page(swp_offset(start), handle->cur);
|
|
|
|
if (error) {
|
2006-03-23 13:59:59 +03:00
|
|
|
release_swap_reader(handle);
|
2006-01-06 11:13:05 +03:00
|
|
|
return error;
|
|
|
|
}
|
|
|
|
handle->k = 0;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2006-03-23 13:59:59 +03:00
|
|
|
static int swap_read_page(struct swap_map_handle *handle, void *buf)
|
2006-01-06 11:13:05 +03:00
|
|
|
{
|
|
|
|
unsigned long offset;
|
|
|
|
int error;
|
|
|
|
|
|
|
|
if (!handle->cur)
|
|
|
|
return -EINVAL;
|
2006-03-23 13:59:59 +03:00
|
|
|
offset = handle->cur->entries[handle->k];
|
2006-01-06 11:13:05 +03:00
|
|
|
if (!offset)
|
2006-03-23 13:59:59 +03:00
|
|
|
return -EFAULT;
|
2006-01-06 11:13:05 +03:00
|
|
|
error = bio_read_page(offset, buf);
|
|
|
|
if (error)
|
|
|
|
return error;
|
2006-03-23 13:59:59 +03:00
|
|
|
if (++handle->k >= MAP_PAGE_ENTRIES) {
|
2006-01-06 11:13:05 +03:00
|
|
|
handle->k = 0;
|
2006-03-23 13:59:59 +03:00
|
|
|
offset = handle->cur->next_swap;
|
2006-01-06 11:13:05 +03:00
|
|
|
if (!offset)
|
2006-03-23 13:59:59 +03:00
|
|
|
release_swap_reader(handle);
|
2006-01-06 11:13:05 +03:00
|
|
|
else
|
|
|
|
error = bio_read_page(offset, handle->cur);
|
|
|
|
}
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
2005-04-17 02:20:36 +04:00
|
|
|
/**
|
2006-03-23 13:59:59 +03:00
|
|
|
* load_image - load the image using the swap map handle
|
|
|
|
* @handle and the snapshot handle @snapshot
|
2006-01-06 11:13:05 +03:00
|
|
|
* (assume there are @nr_pages pages to load)
|
2005-04-17 02:20:36 +04:00
|
|
|
*/
|
|
|
|
|
2006-03-23 13:59:59 +03:00
|
|
|
static int load_image(struct swap_map_handle *handle,
|
|
|
|
struct snapshot_handle *snapshot,
|
|
|
|
unsigned int nr_pages)
|
2005-04-17 02:20:36 +04:00
|
|
|
{
|
2006-01-06 11:13:05 +03:00
|
|
|
unsigned int m;
|
2006-03-23 13:59:59 +03:00
|
|
|
int ret;
|
|
|
|
int error = 0;
|
2005-04-17 02:20:36 +04:00
|
|
|
|
2006-01-06 11:13:05 +03:00
|
|
|
printk("Loading image data pages (%u pages) ... ", nr_pages);
|
|
|
|
m = nr_pages / 100;
|
|
|
|
if (!m)
|
|
|
|
m = 1;
|
|
|
|
nr_pages = 0;
|
2006-03-23 13:59:59 +03:00
|
|
|
do {
|
|
|
|
ret = snapshot_write_next(snapshot, PAGE_SIZE);
|
|
|
|
if (ret > 0) {
|
|
|
|
error = swap_read_page(handle, data_of(*snapshot));
|
|
|
|
if (error)
|
|
|
|
break;
|
|
|
|
if (!(nr_pages % m))
|
|
|
|
printk("\b\b\b\b%3d%%", nr_pages / m);
|
|
|
|
nr_pages++;
|
|
|
|
}
|
|
|
|
} while (ret > 0);
|
2006-01-06 11:13:05 +03:00
|
|
|
if (!error)
|
|
|
|
printk("\b\b\b\bdone\n");
|
2006-03-23 13:59:59 +03:00
|
|
|
if (!snapshot_image_loaded(snapshot))
|
|
|
|
error = -ENODATA;
|
2005-04-17 02:20:36 +04:00
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
2006-03-23 13:59:59 +03:00
|
|
|
int swsusp_read(void)
|
2005-04-17 02:20:36 +04:00
|
|
|
{
|
2006-01-06 11:17:58 +03:00
|
|
|
int error;
|
2006-01-06 11:13:05 +03:00
|
|
|
struct swap_map_handle handle;
|
2006-03-23 13:59:59 +03:00
|
|
|
struct snapshot_handle snapshot;
|
|
|
|
struct swsusp_info *header;
|
2006-01-06 11:17:58 +03:00
|
|
|
unsigned int nr_pages;
|
2005-04-17 02:20:36 +04:00
|
|
|
|
2006-01-06 11:17:58 +03:00
|
|
|
if (IS_ERR(resume_bdev)) {
|
|
|
|
pr_debug("swsusp: block device not initialised\n");
|
|
|
|
return PTR_ERR(resume_bdev);
|
|
|
|
}
|
|
|
|
|
2006-03-23 13:59:59 +03:00
|
|
|
memset(&snapshot, 0, sizeof(struct snapshot_handle));
|
|
|
|
error = snapshot_write_next(&snapshot, PAGE_SIZE);
|
|
|
|
if (error < PAGE_SIZE)
|
|
|
|
return error < 0 ? error : -EFAULT;
|
|
|
|
header = (struct swsusp_info *)data_of(snapshot);
|
|
|
|
error = get_swap_reader(&handle, swsusp_header.image);
|
2006-01-06 11:17:58 +03:00
|
|
|
if (!error)
|
2006-03-23 13:59:59 +03:00
|
|
|
error = swap_read_page(&handle, header);
|
2006-01-06 11:13:05 +03:00
|
|
|
if (!error) {
|
2006-03-23 13:59:59 +03:00
|
|
|
nr_pages = header->image_pages;
|
|
|
|
error = load_image(&handle, &snapshot, nr_pages);
|
2005-11-09 08:34:40 +03:00
|
|
|
}
|
2006-03-23 13:59:59 +03:00
|
|
|
release_swap_reader(&handle);
|
2006-01-06 11:17:58 +03:00
|
|
|
|
|
|
|
blkdev_put(resume_bdev);
|
|
|
|
|
|
|
|
if (!error)
|
|
|
|
pr_debug("swsusp: Reading resume file was successful\n");
|
|
|
|
else
|
|
|
|
pr_debug("swsusp: Error %d resuming\n", error);
|
2005-04-17 02:20:36 +04:00
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2006-01-06 11:17:58 +03:00
|
|
|
* swsusp_check - Check for swsusp signature in the resume device
|
2005-04-17 02:20:36 +04:00
|
|
|
*/
|
|
|
|
|
|
|
|
int swsusp_check(void)
|
|
|
|
{
|
|
|
|
int error;
|
|
|
|
|
|
|
|
resume_bdev = open_by_devnum(swsusp_resume_device, FMODE_READ);
|
|
|
|
if (!IS_ERR(resume_bdev)) {
|
|
|
|
set_blocksize(resume_bdev, PAGE_SIZE);
|
2006-01-06 11:17:58 +03:00
|
|
|
memset(&swsusp_header, 0, sizeof(swsusp_header));
|
|
|
|
if ((error = bio_read_page(0, &swsusp_header)))
|
|
|
|
return error;
|
|
|
|
if (!memcmp(SWSUSP_SIG, swsusp_header.sig, 10)) {
|
|
|
|
memcpy(swsusp_header.sig, swsusp_header.orig_sig, 10);
|
|
|
|
/* Reset swap signature now */
|
|
|
|
error = bio_write_page(0, &swsusp_header);
|
|
|
|
} else {
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
2005-04-17 02:20:36 +04:00
|
|
|
if (error)
|
2006-01-06 11:17:58 +03:00
|
|
|
blkdev_put(resume_bdev);
|
|
|
|
else
|
|
|
|
pr_debug("swsusp: Signature found, resuming\n");
|
|
|
|
} else {
|
2005-04-17 02:20:36 +04:00
|
|
|
error = PTR_ERR(resume_bdev);
|
|
|
|
}
|
|
|
|
|
2006-01-06 11:17:58 +03:00
|
|
|
if (error)
|
|
|
|
pr_debug("swsusp: Error %d check for resume file\n", error);
|
2005-04-17 02:20:36 +04:00
|
|
|
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* swsusp_close - close swap device.
|
|
|
|
*/
|
|
|
|
|
|
|
|
void swsusp_close(void)
|
|
|
|
{
|
|
|
|
if (IS_ERR(resume_bdev)) {
|
|
|
|
pr_debug("swsusp: block device not initialised\n");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
blkdev_put(resume_bdev);
|
|
|
|
}
|