summaryrefslogtreecommitdiff
path: root/kernel/power/tuxonice_bio_signature.c
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/power/tuxonice_bio_signature.c')
-rw-r--r--kernel/power/tuxonice_bio_signature.c403
1 files changed, 0 insertions, 403 deletions
diff --git a/kernel/power/tuxonice_bio_signature.c b/kernel/power/tuxonice_bio_signature.c
deleted file mode 100644
index f5418f092..000000000
--- a/kernel/power/tuxonice_bio_signature.c
+++ /dev/null
@@ -1,403 +0,0 @@
-/*
- * kernel/power/tuxonice_bio_signature.c
- *
- * Copyright (C) 2004-2015 Nigel Cunningham (nigel at nigelcunningham com au)
- *
- * Distributed under GPLv2.
- *
- */
-
-#include <linux/fs_uuid.h>
-
-#include "tuxonice.h"
-#include "tuxonice_sysfs.h"
-#include "tuxonice_modules.h"
-#include "tuxonice_prepare_image.h"
-#include "tuxonice_bio.h"
-#include "tuxonice_ui.h"
-#include "tuxonice_alloc.h"
-#include "tuxonice_io.h"
-#include "tuxonice_builtin.h"
-#include "tuxonice_bio_internal.h"
-
-struct sig_data *toi_sig_data;
-
-/* Struct of swap header pages */
-
-struct old_sig_data {
- dev_t device;
- unsigned long sector;
- int resume_attempted;
- int orig_sig_type;
-};
-
-union diskpage {
- union swap_header swh; /* swh.magic is the only member used */
- struct sig_data sig_data;
- struct old_sig_data old_sig_data;
-};
-
-union p_diskpage {
- union diskpage *pointer;
- char *ptr;
- unsigned long address;
-};
-
-char *toi_cur_sig_page;
-char *toi_orig_sig_page;
-int have_image;
-int have_old_image;
-
-int get_signature_page(void)
-{
- if (!toi_cur_sig_page) {
- toi_message(TOI_IO, TOI_VERBOSE, 0,
- "Allocating current signature page.");
- toi_cur_sig_page = (char *) toi_get_zeroed_page(38,
- TOI_ATOMIC_GFP);
- if (!toi_cur_sig_page) {
- printk(KERN_ERR "Failed to allocate memory for the "
- "current image signature.\n");
- return -ENOMEM;
- }
-
- toi_sig_data = (struct sig_data *) toi_cur_sig_page;
- }
-
- toi_message(TOI_IO, TOI_VERBOSE, 0, "Reading signature from dev %lx,"
- " sector %d.",
- resume_block_device->bd_dev, resume_firstblock);
-
- return toi_bio_ops.bdev_page_io(READ, resume_block_device,
- resume_firstblock, virt_to_page(toi_cur_sig_page));
-}
-
-void forget_signature_page(void)
-{
- if (toi_cur_sig_page) {
- toi_sig_data = NULL;
- toi_message(TOI_IO, TOI_VERBOSE, 0, "Freeing toi_cur_sig_page"
- " (%p).", toi_cur_sig_page);
- toi_free_page(38, (unsigned long) toi_cur_sig_page);
- toi_cur_sig_page = NULL;
- }
-
- if (toi_orig_sig_page) {
- toi_message(TOI_IO, TOI_VERBOSE, 0, "Freeing toi_orig_sig_page"
- " (%p).", toi_orig_sig_page);
- toi_free_page(38, (unsigned long) toi_orig_sig_page);
- toi_orig_sig_page = NULL;
- }
-}
-
-/*
- * We need to ensure we use the signature page that's currently on disk,
- * so as to not remove the image header. Post-atomic-restore, the orig sig
- * page will be empty, so we can use that as our method of knowing that we
- * need to load the on-disk signature and not use the non-image sig in
- * memory. (We're going to powerdown after writing the change, so it's safe.
- */
-int toi_bio_mark_resume_attempted(int flag)
-{
- toi_message(TOI_IO, TOI_VERBOSE, 0, "Make resume attempted = %d.",
- flag);
- if (!toi_orig_sig_page) {
- forget_signature_page();
- get_signature_page();
- }
- toi_sig_data->resumed_before = flag;
- return toi_bio_ops.bdev_page_io(WRITE, resume_block_device,
- resume_firstblock, virt_to_page(toi_cur_sig_page));
-}
-
-int toi_bio_mark_have_image(void)
-{
- int result = 0;
- char buf[32];
- struct fs_info *fs_info;
-
- toi_message(TOI_IO, TOI_VERBOSE, 0, "Recording that an image exists.");
- memcpy(toi_sig_data->sig, tuxonice_signature,
- sizeof(tuxonice_signature));
- toi_sig_data->have_image = 1;
- toi_sig_data->resumed_before = 0;
- toi_sig_data->header_dev_t = get_header_dev_t();
- toi_sig_data->have_uuid = 0;
-
- fs_info = fs_info_from_block_dev(get_header_bdev());
- if (fs_info && !IS_ERR(fs_info)) {
- memcpy(toi_sig_data->header_uuid, &fs_info->uuid, 16);
- free_fs_info(fs_info);
- } else
- result = (int) PTR_ERR(fs_info);
-
- if (!result) {
- toi_message(TOI_IO, TOI_VERBOSE, 0, "Got uuid for dev_t %s.",
- format_dev_t(buf, get_header_dev_t()));
- toi_sig_data->have_uuid = 1;
- } else
- toi_message(TOI_IO, TOI_VERBOSE, 0, "Could not get uuid for "
- "dev_t %s.",
- format_dev_t(buf, get_header_dev_t()));
-
- toi_sig_data->first_header_block = get_headerblock();
- have_image = 1;
- toi_message(TOI_IO, TOI_VERBOSE, 0, "header dev_t is %x. First block "
- "is %d.", toi_sig_data->header_dev_t,
- toi_sig_data->first_header_block);
-
- memcpy(toi_sig_data->sig2, tuxonice_signature,
- sizeof(tuxonice_signature));
- toi_sig_data->header_version = TOI_HEADER_VERSION;
-
- return toi_bio_ops.bdev_page_io(WRITE, resume_block_device,
- resume_firstblock, virt_to_page(toi_cur_sig_page));
-}
-
-int remove_old_signature(void)
-{
- union p_diskpage swap_header_page = (union p_diskpage) toi_cur_sig_page;
- char *orig_sig;
- char *header_start = (char *) toi_get_zeroed_page(38, TOI_ATOMIC_GFP);
- int result;
- struct block_device *header_bdev;
- struct old_sig_data *old_sig_data =
- &swap_header_page.pointer->old_sig_data;
-
- header_bdev = toi_open_bdev(NULL, old_sig_data->device, 1);
- result = toi_bio_ops.bdev_page_io(READ, header_bdev,
- old_sig_data->sector, virt_to_page(header_start));
-
- if (result)
- goto out;
-
- /*
- * TODO: Get the original contents of the first bytes of the swap
- * header page.
- */
- if (!old_sig_data->orig_sig_type)
- orig_sig = "SWAP-SPACE";
- else
- orig_sig = "SWAPSPACE2";
-
- memcpy(swap_header_page.pointer->swh.magic.magic, orig_sig, 10);
- memcpy(swap_header_page.ptr, header_start, 10);
-
- result = toi_bio_ops.bdev_page_io(WRITE, resume_block_device,
- resume_firstblock, virt_to_page(swap_header_page.ptr));
-
-out:
- toi_close_bdev(header_bdev);
- have_old_image = 0;
- toi_free_page(38, (unsigned long) header_start);
- return result;
-}
-
-/*
- * toi_bio_restore_original_signature - restore the original signature
- *
- * At boot time (aborting pre atomic-restore), toi_orig_sig_page gets used.
- * It will have the original signature page contents, stored in the image
- * header. Post atomic-restore, we use :toi_cur_sig_page, which will contain
- * the contents that were loaded when we started the cycle.
- */
-int toi_bio_restore_original_signature(void)
-{
- char *use = toi_orig_sig_page ? toi_orig_sig_page : toi_cur_sig_page;
-
- if (have_old_image)
- return remove_old_signature();
-
- if (!use) {
- printk("toi_bio_restore_original_signature: No signature "
- "page loaded.\n");
- return 0;
- }
-
- toi_message(TOI_IO, TOI_VERBOSE, 0, "Recording that no image exists.");
- have_image = 0;
- toi_sig_data->have_image = 0;
- return toi_bio_ops.bdev_page_io(WRITE, resume_block_device,
- resume_firstblock, virt_to_page(use));
-}
-
-/*
- * check_for_signature - See whether we have an image.
- *
- * Returns 0 if no image, 1 if there is one, -1 if indeterminate.
- */
-int toi_check_for_signature(void)
-{
- union p_diskpage swap_header_page;
- int type;
- const char *normal_sigs[] = {"SWAP-SPACE", "SWAPSPACE2" };
- const char *swsusp_sigs[] = {"S1SUSP", "S2SUSP", "S1SUSPEND" };
- char *swap_header;
-
- if (!toi_cur_sig_page) {
- int result = get_signature_page();
-
- if (result)
- return result;
- }
-
- /*
- * Start by looking for the binary header.
- */
- if (!memcmp(tuxonice_signature, toi_cur_sig_page,
- sizeof(tuxonice_signature))) {
- have_image = toi_sig_data->have_image;
- toi_message(TOI_IO, TOI_VERBOSE, 0, "Have binary signature. "
- "Have image is %d.", have_image);
- if (have_image)
- toi_message(TOI_IO, TOI_VERBOSE, 0, "header dev_t is "
- "%x. First block is %d.",
- toi_sig_data->header_dev_t,
- toi_sig_data->first_header_block);
- return toi_sig_data->have_image;
- }
-
- /*
- * Failing that, try old file allocator headers.
- */
-
- if (!memcmp(HaveImage, toi_cur_sig_page, strlen(HaveImage))) {
- have_image = 1;
- return 1;
- }
-
- have_image = 0;
-
- if (!memcmp(NoImage, toi_cur_sig_page, strlen(NoImage)))
- return 0;
-
- /*
- * Nope? How about swap?
- */
- swap_header_page = (union p_diskpage) toi_cur_sig_page;
- swap_header = swap_header_page.pointer->swh.magic.magic;
-
- /* Normal swapspace? */
- for (type = 0; type < 2; type++)
- if (!memcmp(normal_sigs[type], swap_header,
- strlen(normal_sigs[type])))
- return 0;
-
- /* Swsusp or uswsusp? */
- for (type = 0; type < 3; type++)
- if (!memcmp(swsusp_sigs[type], swap_header,
- strlen(swsusp_sigs[type])))
- return 2;
-
- /* Old TuxOnIce version? */
- if (!memcmp(tuxonice_signature, swap_header,
- sizeof(tuxonice_signature) - 1)) {
- toi_message(TOI_IO, TOI_VERBOSE, 0, "Found old TuxOnIce "
- "signature.");
- have_old_image = 1;
- return 3;
- }
-
- return -1;
-}
-
-/*
- * Image_exists
- *
- * Returns -1 if don't know, otherwise 0 (no) or 1 (yes).
- */
-int toi_bio_image_exists(int quiet)
-{
- int result;
- char *msg = NULL;
-
- toi_message(TOI_IO, TOI_VERBOSE, 0, "toi_bio_image_exists.");
-
- if (!resume_dev_t) {
- if (!quiet)
- printk(KERN_INFO "Not even trying to read header "
- "because resume_dev_t is not set.\n");
- return -1;
- }
-
- if (open_resume_dev_t(0, quiet))
- return -1;
-
- result = toi_check_for_signature();
-
- clear_toi_state(TOI_RESUMED_BEFORE);
- if (toi_sig_data->resumed_before)
- set_toi_state(TOI_RESUMED_BEFORE);
-
- if (quiet || result == -ENOMEM)
- return result;
-
- if (result == -1)
- msg = "TuxOnIce: Unable to find a signature."
- " Could you have moved a swap file?\n";
- else if (!result)
- msg = "TuxOnIce: No image found.\n";
- else if (result == 1)
- msg = "TuxOnIce: Image found.\n";
- else if (result == 2)
- msg = "TuxOnIce: uswsusp or swsusp image found.\n";
- else if (result == 3)
- msg = "TuxOnIce: Old implementation's signature found.\n";
-
- printk(KERN_INFO "%s", msg);
-
- return result;
-}
-
-int toi_bio_scan_for_image(int quiet)
-{
- struct block_device *bdev;
- char default_name[255] = "";
-
- if (!quiet)
- printk(KERN_DEBUG "Scanning swap devices for TuxOnIce "
- "signature...\n");
- for (bdev = next_bdev_of_type(NULL, "swap"); bdev;
- bdev = next_bdev_of_type(bdev, "swap")) {
- int result;
- char name[255] = "";
- sprintf(name, "%u:%u", MAJOR(bdev->bd_dev),
- MINOR(bdev->bd_dev));
- if (!quiet)
- printk(KERN_DEBUG "- Trying %s.\n", name);
- resume_block_device = bdev;
- resume_dev_t = bdev->bd_dev;
-
- result = toi_check_for_signature();
-
- resume_block_device = NULL;
- resume_dev_t = MKDEV(0, 0);
-
- if (!default_name[0])
- strcpy(default_name, name);
-
- if (result == 1) {
- /* Got one! */
- strcpy(resume_file, name);
- next_bdev_of_type(bdev, NULL);
- if (!quiet)
- printk(KERN_DEBUG " ==> Image found on %s.\n",
- resume_file);
- return 1;
- }
- forget_signature_page();
- }
-
- if (!quiet)
- printk(KERN_DEBUG "TuxOnIce scan: No image found.\n");
- strcpy(resume_file, default_name);
- return 0;
-}
-
-int toi_bio_get_header_version(void)
-{
- return (memcmp(toi_sig_data->sig2, tuxonice_signature,
- sizeof(tuxonice_signature))) ?
- 0 : toi_sig_data->header_version;
-
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-06 07:12:38 +0000