int allocate_checksum_pages(void)
{
int pages_needed = checksum_pages_needed();
if (!toi_checksum_ops.enabled)
return 0;
while (pages_allocated < pages_needed) {
unsigned long *new_page =
(unsigned long *) toi_get_zeroed_page(15, TOI_ATOMIC_GFP);
if (!new_page) {
printk(KERN_ERR "Unable to allocate checksum pages.\n");
return -ENOMEM;
}
SetPageNosave(virt_to_page(new_page));
(*new_page) = page_list;
page_list = (unsigned long) new_page;
pages_allocated++;
}
next_page = (unsigned long) page_list;
checksum_index = 0;
return 0;
}
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) {
pr_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 %x, sector %lu.",
(unsigned int) 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));
}
int remove_old_signature(void)
{
union p_diskpage swap_header_page = (union p_diskpage) toi_cur_sig_page;
char *orig_sig, *no_image_signature_contents;
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,
sizeof(no_image_signature_contents));
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;
}
