diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index 5bc04bfe2..70b84dc38 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -1,1668 +1,1717 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * linux/kernel/power/swap.c
- *
- * This file provides functions for reading the suspend image from
- * and writing it to a swap partition.
- *
- * Copyright (C) 1998,2001-2005 Pavel Machek <pavel@ucw.cz>
- * Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl>
- * Copyright (C) 2010-2012 Bojan Smojver <bojan@rexursive.com>
- */
-
-#define pr_fmt(fmt) "PM: " fmt
-
-#include <linux/module.h>
-#include <linux/file.h>
-#include <linux/delay.h>
-#include <linux/bitops.h>
-#include <linux/device.h>
-#include <linux/bio.h>
-#include <linux/blkdev.h>
-#include <linux/swap.h>
-#include <linux/swapops.h>
-#include <linux/pm.h>
-#include <linux/slab.h>
-#include <linux/vmalloc.h>
-#include <linux/cpumask.h>
-#include <linux/atomic.h>
-#include <linux/kthread.h>
-#include <linux/crc32.h>
-#include <linux/ktime.h>
-
-#include "power.h"
-
-#define HIBERNATE_SIG	"S1SUSPEND"
-
-u32 swsusp_hardware_signature;
-
-/*
- * When reading an {un,}compressed image, we may restore pages in place,
- * in which case some architectures need these pages cleaning before they
- * can be executed. We don't know which pages these may be, so clean the lot.
- */
-static bool clean_pages_on_read;
-static bool clean_pages_on_decompress;
-
-/*
- *	The swap map is a data structure used for keeping track of each page
- *	written to a swap partition.  It consists of many swap_map_page
- *	structures that contain each an array of MAP_PAGE_ENTRIES swap entries.
- *	These structures are stored on the swap and linked together with the
- *	help of the .next_swap member.
- *
- *	The swap map is created during suspend.  The swap map pages are
- *	allocated and populated one at a time, so we only need one memory
- *	page to set up the entire structure.
- *
- *	During resume we pick up all swap_map_page structures into a list.
- */
-
-#define MAP_PAGE_ENTRIES	(PAGE_SIZE / sizeof(sector_t) - 1)
-
-/*
- * Number of free pages that are not high.
- */
-static inline unsigned long low_free_pages(void)
-{
-	return nr_free_pages() - nr_free_highpages();
-}
-
-/*
- * Number of pages required to be kept free while writing the image. Always
- * half of all available low pages before the writing starts.
- */
-static inline unsigned long reqd_free_pages(void)
-{
-	return low_free_pages() / 2;
-}
-
-struct swap_map_page {
-	sector_t entries[MAP_PAGE_ENTRIES];
-	sector_t next_swap;
-};
-
-struct swap_map_page_list {
-	struct swap_map_page *map;
-	struct swap_map_page_list *next;
-};
-
-/*
- *	The swap_map_handle structure is used for handling swap in
- *	a file-alike way
- */
-
-struct swap_map_handle {
-	struct swap_map_page *cur;
-	struct swap_map_page_list *maps;
-	sector_t cur_swap;
-	sector_t first_sector;
-	unsigned int k;
-	unsigned long reqd_free_pages;
-	u32 crc32;
-};
-
-struct swsusp_header {
-	char reserved[PAGE_SIZE - 20 - sizeof(sector_t) - sizeof(int) -
-	              sizeof(u32) - sizeof(u32)];
-	u32	hw_sig;
-	u32	crc32;
-	sector_t image;
-	unsigned int flags;	/* Flags to pass to the "boot" kernel */
-	char	orig_sig[10];
-	char	sig[10];
-} __packed;
-
-static struct swsusp_header *swsusp_header;
-
-/*
- *	The following functions are used for tracing the allocated
- *	swap pages, so that they can be freed in case of an error.
- */
-
-struct swsusp_extent {
-	struct rb_node node;
-	unsigned long start;
-	unsigned long end;
-};
-
-static struct rb_root swsusp_extents = RB_ROOT;
-
-static int swsusp_extents_insert(unsigned long swap_offset)
-{
-	struct rb_node **new = &(swsusp_extents.rb_node);
-	struct rb_node *parent = NULL;
-	struct swsusp_extent *ext;
-
-	/* Figure out where to put the new node */
-	while (*new) {
-		ext = rb_entry(*new, struct swsusp_extent, node);
-		parent = *new;
-		if (swap_offset < ext->start) {
-			/* Try to merge */
-			if (swap_offset == ext->start - 1) {
-				ext->start--;
-				return 0;
-			}
-			new = &((*new)->rb_left);
-		} else if (swap_offset > ext->end) {
-			/* Try to merge */
-			if (swap_offset == ext->end + 1) {
-				ext->end++;
-				return 0;
-			}
-			new = &((*new)->rb_right);
-		} else {
-			/* It already is in the tree */
-			return -EINVAL;
-		}
-	}
-	/* Add the new node and rebalance the tree. */
-	ext = kzalloc(sizeof(struct swsusp_extent), GFP_KERNEL);
-	if (!ext)
-		return -ENOMEM;
-
-	ext->start = swap_offset;
-	ext->end = swap_offset;
-	rb_link_node(&ext->node, parent, new);
-	rb_insert_color(&ext->node, &swsusp_extents);
-	return 0;
-}
-
-/*
- *	alloc_swapdev_block - allocate a swap page and register that it has
- *	been allocated, so that it can be freed in case of an error.
- */
-
-sector_t alloc_swapdev_block(int swap)
-{
-	unsigned long offset;
-
-	offset = swp_offset(get_swap_page_of_type(swap));
-	if (offset) {
-		if (swsusp_extents_insert(offset))
-			swap_free(swp_entry(swap, offset));
-		else
-			return swapdev_block(swap, offset);
-	}
-	return 0;
-}
-
-/*
- *	free_all_swap_pages - free swap pages allocated for saving image data.
- *	It also frees the extents used to register which swap entries had been
- *	allocated.
- */
-
-void free_all_swap_pages(int swap)
-{
-	struct rb_node *node;
-
-	while ((node = swsusp_extents.rb_node)) {
-		struct swsusp_extent *ext;
-		unsigned long offset;
-
-		ext = rb_entry(node, struct swsusp_extent, node);
-		rb_erase(node, &swsusp_extents);
-		for (offset = ext->start; offset <= ext->end; offset++)
-			swap_free(swp_entry(swap, offset));
-
-		kfree(ext);
-	}
-}
-
-int swsusp_swap_in_use(void)
-{
-	return (swsusp_extents.rb_node != NULL);
-}
-
-/*
- * General things
- */
-
-static unsigned short root_swap = 0xffff;
-static struct file *hib_resume_bdev_file;
-
-struct hib_bio_batch {
-	atomic_t		count;
-	wait_queue_head_t	wait;
-	blk_status_t		error;
-	struct blk_plug		plug;
-};
-
-static void hib_init_batch(struct hib_bio_batch *hb)
-{
-	atomic_set(&hb->count, 0);
-	init_waitqueue_head(&hb->wait);
-	hb->error = BLK_STS_OK;
-	blk_start_plug(&hb->plug);
-}
-
-static void hib_finish_batch(struct hib_bio_batch *hb)
-{
-	blk_finish_plug(&hb->plug);
-}
-
-static void hib_end_io(struct bio *bio)
-{
-	struct hib_bio_batch *hb = bio->bi_private;
-	struct page *page = bio_first_page_all(bio);
-
-	if (bio->bi_status) {
-		pr_alert("Read-error on swap-device (%u:%u:%Lu)\n",
-			 MAJOR(bio_dev(bio)), MINOR(bio_dev(bio)),
-			 (unsigned long long)bio->bi_iter.bi_sector);
-	}
-
-	if (bio_data_dir(bio) == WRITE)
-		put_page(page);
-	else if (clean_pages_on_read)
-		flush_icache_range((unsigned long)page_address(page),
-				   (unsigned long)page_address(page) + PAGE_SIZE);
-
-	if (bio->bi_status && !hb->error)
-		hb->error = bio->bi_status;
-	if (atomic_dec_and_test(&hb->count))
-		wake_up(&hb->wait);
-
-	bio_put(bio);
-}
-
-static int hib_submit_io(blk_opf_t opf, pgoff_t page_off, void *addr,
-			 struct hib_bio_batch *hb)
-{
-	struct page *page = virt_to_page(addr);
-	struct bio *bio;
-	int error = 0;
-
-	bio = bio_alloc(file_bdev(hib_resume_bdev_file), 1, opf,
-			GFP_NOIO | __GFP_HIGH);
-	bio->bi_iter.bi_sector = page_off * (PAGE_SIZE >> 9);
-
-	if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
-		pr_err("Adding page to bio failed at %llu\n",
-		       (unsigned long long)bio->bi_iter.bi_sector);
-		bio_put(bio);
-		return -EFAULT;
-	}
-
-	if (hb) {
-		bio->bi_end_io = hib_end_io;
-		bio->bi_private = hb;
-		atomic_inc(&hb->count);
-		submit_bio(bio);
-	} else {
-		error = submit_bio_wait(bio);
-		bio_put(bio);
-	}
-
-	return error;
-}
-
-static int hib_wait_io(struct hib_bio_batch *hb)
-{
-	/*
-	 * We are relying on the behavior of blk_plug that a thread with
-	 * a plug will flush the plug list before sleeping.
-	 */
-	wait_event(hb->wait, atomic_read(&hb->count) == 0);
-	return blk_status_to_errno(hb->error);
-}
-
-/*
- * Saving part
- */
-static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags)
-{
-	int error;
-
-	hib_submit_io(REQ_OP_READ, swsusp_resume_block, swsusp_header, NULL);
-	if (!memcmp("SWAP-SPACE",swsusp_header->sig, 10) ||
-	    !memcmp("SWAPSPACE2",swsusp_header->sig, 10)) {
-		memcpy(swsusp_header->orig_sig,swsusp_header->sig, 10);
-		memcpy(swsusp_header->sig, HIBERNATE_SIG, 10);
-		swsusp_header->image = handle->first_sector;
-		if (swsusp_hardware_signature) {
-			swsusp_header->hw_sig = swsusp_hardware_signature;
-			flags |= SF_HW_SIG;
-		}
-		swsusp_header->flags = flags;
-		if (flags & SF_CRC32_MODE)
-			swsusp_header->crc32 = handle->crc32;
-		error = hib_submit_io(REQ_OP_WRITE | REQ_SYNC,
-				      swsusp_resume_block, swsusp_header, NULL);
-	} else {
-		pr_err("Swap header not found!\n");
-		error = -ENODEV;
-	}
-	return error;
-}
-
-/*
- * Hold the swsusp_header flag. This is used in software_resume() in
- * 'kernel/power/hibernate' to check if the image is compressed and query
- * for the compression algorithm support(if so).
- */
-unsigned int swsusp_header_flags;
-
-/**
- *	swsusp_swap_check - check if the resume device is a swap device
- *	and get its index (if so)
- *
- *	This is called before saving image
- */
-static int swsusp_swap_check(void)
-{
-	int res;
-
-	if (swsusp_resume_device)
-		res = swap_type_of(swsusp_resume_device, swsusp_resume_block);
-	else
-		res = find_first_swap(&swsusp_resume_device);
-	if (res < 0)
-		return res;
-	root_swap = res;
-
-	hib_resume_bdev_file = bdev_file_open_by_dev(swsusp_resume_device,
-			BLK_OPEN_WRITE, NULL, NULL);
-	if (IS_ERR(hib_resume_bdev_file))
-		return PTR_ERR(hib_resume_bdev_file);
-
-	res = set_blocksize(file_bdev(hib_resume_bdev_file), PAGE_SIZE);
-	if (res < 0)
-		fput(hib_resume_bdev_file);
-
-	return res;
-}
-
-/**
- *	write_page - Write one page to given swap location.
- *	@buf:		Address we're writing.
- *	@offset:	Offset of the swap page we're writing to.
- *	@hb:		bio completion batch
- */
-
-static int write_page(void *buf, sector_t offset, struct hib_bio_batch *hb)
-{
-	void *src;
-	int ret;
-
-	if (!offset)
-		return -ENOSPC;
-
-	if (hb) {
-		src = (void *)__get_free_page(GFP_NOIO | __GFP_NOWARN |
-		                              __GFP_NORETRY);
-		if (src) {
-			copy_page(src, buf);
-		} else {
-			ret = hib_wait_io(hb); /* Free pages */
-			if (ret)
-				return ret;
-			src = (void *)__get_free_page(GFP_NOIO |
-			                              __GFP_NOWARN |
-			                              __GFP_NORETRY);
-			if (src) {
-				copy_page(src, buf);
-			} else {
-				WARN_ON_ONCE(1);
-				hb = NULL;	/* Go synchronous */
-				src = buf;
-			}
-		}
-	} else {
-		src = buf;
-	}
-	return hib_submit_io(REQ_OP_WRITE | REQ_SYNC, offset, src, hb);
-}
-
-static void release_swap_writer(struct swap_map_handle *handle)
-{
-	if (handle->cur)
-		free_page((unsigned long)handle->cur);
-	handle->cur = NULL;
-}
-
-static int get_swap_writer(struct swap_map_handle *handle)
-{
-	int ret;
-
-	ret = swsusp_swap_check();
-	if (ret) {
-		if (ret != -ENOSPC)
-			pr_err("Cannot find swap device, try swapon -a\n");
-		return ret;
-	}
-	handle->cur = (struct swap_map_page *)get_zeroed_page(GFP_KERNEL);
-	if (!handle->cur) {
-		ret = -ENOMEM;
-		goto err_close;
-	}
-	handle->cur_swap = alloc_swapdev_block(root_swap);
-	if (!handle->cur_swap) {
-		ret = -ENOSPC;
-		goto err_rel;
-	}
-	handle->k = 0;
-	handle->reqd_free_pages = reqd_free_pages();
-	handle->first_sector = handle->cur_swap;
-	return 0;
-err_rel:
-	release_swap_writer(handle);
-err_close:
-	swsusp_close();
-	return ret;
-}
-
-static int swap_write_page(struct swap_map_handle *handle, void *buf,
-		struct hib_bio_batch *hb)
-{
-	int error;
-	sector_t offset;
-
-	if (!handle->cur)
-		return -EINVAL;
-	offset = alloc_swapdev_block(root_swap);
-	error = write_page(buf, offset, hb);
-	if (error)
-		return error;
-	handle->cur->entries[handle->k++] = offset;
-	if (handle->k >= MAP_PAGE_ENTRIES) {
-		offset = alloc_swapdev_block(root_swap);
-		if (!offset)
-			return -ENOSPC;
-		handle->cur->next_swap = offset;
-		error = write_page(handle->cur, handle->cur_swap, hb);
-		if (error)
-			goto out;
-		clear_page(handle->cur);
-		handle->cur_swap = offset;
-		handle->k = 0;
-
-		if (hb && low_free_pages() <= handle->reqd_free_pages) {
-			error = hib_wait_io(hb);
-			if (error)
-				goto out;
-			/*
-			 * Recalculate the number of required free pages, to
-			 * make sure we never take more than half.
-			 */
-			handle->reqd_free_pages = reqd_free_pages();
-		}
-	}
- out:
-	return error;
-}
-
-static int flush_swap_writer(struct swap_map_handle *handle)
-{
-	if (handle->cur && handle->cur_swap)
-		return write_page(handle->cur, handle->cur_swap, NULL);
-	else
-		return -EINVAL;
-}
-
-static int swap_writer_finish(struct swap_map_handle *handle,
-		unsigned int flags, int error)
-{
-	if (!error) {
-		pr_info("S");
-		error = mark_swapfiles(handle, flags);
-		pr_cont("|\n");
-		flush_swap_writer(handle);
-	}
-
-	if (error)
-		free_all_swap_pages(root_swap);
-	release_swap_writer(handle);
-	swsusp_close();
-
-	return error;
-}
-
-/*
- * Bytes we need for compressed data in worst case. We assume(limitation)
- * this is the worst of all the compression algorithms.
- */
-#define bytes_worst_compress(x) ((x) + ((x) / 16) + 64 + 3 + 2)
-
-/* We need to remember how much compressed data we need to read. */
-#define CMP_HEADER	sizeof(size_t)
-
-/* Number of pages/bytes we'll compress at one time. */
-#define UNC_PAGES	32
-#define UNC_SIZE	(UNC_PAGES * PAGE_SIZE)
-
-/* Number of pages we need for compressed data (worst case). */
-#define CMP_PAGES	DIV_ROUND_UP(bytes_worst_compress(UNC_SIZE) + \
-				CMP_HEADER, PAGE_SIZE)
-#define CMP_SIZE	(CMP_PAGES * PAGE_SIZE)
-
-/* Maximum number of threads for compression/decompression. */
-#define CMP_THREADS	3
-
-/* Minimum/maximum number of pages for read buffering. */
-#define CMP_MIN_RD_PAGES	1024
-#define CMP_MAX_RD_PAGES	8192
-
-/**
- *	save_image - save the suspend image data
- */
-
-static int save_image(struct swap_map_handle *handle,
-                      struct snapshot_handle *snapshot,
-                      unsigned int nr_to_write)
-{
-	unsigned int m;
-	int ret;
-	int nr_pages;
-	int err2;
-	struct hib_bio_batch hb;
-	ktime_t start;
-	ktime_t stop;
-
-	hib_init_batch(&hb);
-
-	pr_info("Saving image data pages (%u pages)...\n",
-		nr_to_write);
-	m = nr_to_write / 10;
-	if (!m)
-		m = 1;
-	nr_pages = 0;
-	start = ktime_get();
-	while (1) {
-		ret = snapshot_read_next(snapshot);
-		if (ret <= 0)
-			break;
-		ret = swap_write_page(handle, data_of(*snapshot), &hb);
-		if (ret)
-			break;
-		if (!(nr_pages % m))
-			pr_info("Image saving progress: %3d%%\n",
-				nr_pages / m * 10);
-		nr_pages++;
-	}
-	err2 = hib_wait_io(&hb);
-	hib_finish_batch(&hb);
-	stop = ktime_get();
-	if (!ret)
-		ret = err2;
-	if (!ret)
-		pr_info("Image saving done\n");
-	swsusp_show_speed(start, stop, nr_to_write, "Wrote");
-	return ret;
-}
-
-/*
- * Structure used for CRC32.
- */
-struct crc_data {
-	struct task_struct *thr;                  /* thread */
-	atomic_t ready;                           /* ready to start flag */
-	atomic_t stop;                            /* ready to stop flag */
-	unsigned run_threads;                     /* nr current threads */
-	wait_queue_head_t go;                     /* start crc update */
-	wait_queue_head_t done;                   /* crc update done */
-	u32 *crc32;                               /* points to handle's crc32 */
-	size_t *unc_len[CMP_THREADS];             /* uncompressed lengths */
-	unsigned char *unc[CMP_THREADS];          /* uncompressed data */
-};
-
-/*
- * CRC32 update function that runs in its own thread.
- */
-static int crc32_threadfn(void *data)
-{
-	struct crc_data *d = data;
-	unsigned i;
-
-	while (1) {
-		wait_event(d->go, atomic_read_acquire(&d->ready) ||
-		                  kthread_should_stop());
-		if (kthread_should_stop()) {
-			d->thr = NULL;
-			atomic_set_release(&d->stop, 1);
-			wake_up(&d->done);
-			break;
-		}
-		atomic_set(&d->ready, 0);
-
-		for (i = 0; i < d->run_threads; i++)
-			*d->crc32 = crc32_le(*d->crc32,
-			                     d->unc[i], *d->unc_len[i]);
-		atomic_set_release(&d->stop, 1);
-		wake_up(&d->done);
-	}
-	return 0;
-}
-/*
- * Structure used for data compression.
- */
-struct cmp_data {
-	struct task_struct *thr;                  /* thread */
-	struct crypto_comp *cc;                   /* crypto compressor stream */
-	atomic_t ready;                           /* ready to start flag */
-	atomic_t stop;                            /* ready to stop flag */
-	int ret;                                  /* return code */
-	wait_queue_head_t go;                     /* start compression */
-	wait_queue_head_t done;                   /* compression done */
-	size_t unc_len;                           /* uncompressed length */
-	size_t cmp_len;                           /* compressed length */
-	unsigned char unc[UNC_SIZE];              /* uncompressed buffer */
-	unsigned char cmp[CMP_SIZE];              /* compressed buffer */
-};
-
-/* Indicates the image size after compression */
-static atomic_t compressed_size = ATOMIC_INIT(0);
-
-/*
- * Compression function that runs in its own thread.
- */
-static int compress_threadfn(void *data)
-{
-	struct cmp_data *d = data;
-	unsigned int cmp_len = 0;
-
-	while (1) {
-		wait_event(d->go, atomic_read_acquire(&d->ready) ||
-		                  kthread_should_stop());
-		if (kthread_should_stop()) {
-			d->thr = NULL;
-			d->ret = -1;
-			atomic_set_release(&d->stop, 1);
-			wake_up(&d->done);
-			break;
-		}
-		atomic_set(&d->ready, 0);
-
-		cmp_len = CMP_SIZE - CMP_HEADER;
-		d->ret = crypto_comp_compress(d->cc, d->unc, d->unc_len,
-					      d->cmp + CMP_HEADER,
-					      &cmp_len);
-		d->cmp_len = cmp_len;
-
-		atomic_set(&compressed_size, atomic_read(&compressed_size) + d->cmp_len);
-		atomic_set_release(&d->stop, 1);
-		wake_up(&d->done);
-	}
-	return 0;
-}
-
-/**
- * save_compressed_image - Save the suspend image data after compression.
- * @handle: Swap map handle to use for saving the image.
- * @snapshot: Image to read data from.
- * @nr_to_write: Number of pages to save.
- */
-static int save_compressed_image(struct swap_map_handle *handle,
-				 struct snapshot_handle *snapshot,
-				 unsigned int nr_to_write)
-{
-	unsigned int m;
-	int ret = 0;
-	int nr_pages;
-	int err2;
-	struct hib_bio_batch hb;
-	ktime_t start;
-	ktime_t stop;
-	size_t off;
-	unsigned thr, run_threads, nr_threads;
-	unsigned char *page = NULL;
-	struct cmp_data *data = NULL;
-	struct crc_data *crc = NULL;
-
-	hib_init_batch(&hb);
-
-	atomic_set(&compressed_size, 0);
-
-	/*
-	 * We'll limit the number of threads for compression to limit memory
-	 * footprint.
-	 */
-	nr_threads = num_online_cpus() - 1;
-	nr_threads = clamp_val(nr_threads, 1, CMP_THREADS);
-
-	page = (void *)__get_free_page(GFP_NOIO | __GFP_HIGH);
-	if (!page) {
-		pr_err("Failed to allocate %s page\n", hib_comp_algo);
-		ret = -ENOMEM;
-		goto out_clean;
-	}
-
-	data = vzalloc(array_size(nr_threads, sizeof(*data)));
-	if (!data) {
-		pr_err("Failed to allocate %s data\n", hib_comp_algo);
-		ret = -ENOMEM;
-		goto out_clean;
-	}
-
-	crc = kzalloc(sizeof(*crc), GFP_KERNEL);
-	if (!crc) {
-		pr_err("Failed to allocate crc\n");
-		ret = -ENOMEM;
-		goto out_clean;
-	}
-
-	/*
-	 * Start the compression threads.
-	 */
-	for (thr = 0; thr < nr_threads; thr++) {
-		init_waitqueue_head(&data[thr].go);
-		init_waitqueue_head(&data[thr].done);
-
-		data[thr].cc = crypto_alloc_comp(hib_comp_algo, 0, 0);
-		if (IS_ERR_OR_NULL(data[thr].cc)) {
-			pr_err("Could not allocate comp stream %ld\n", PTR_ERR(data[thr].cc));
-			ret = -EFAULT;
-			goto out_clean;
-		}
-
-		data[thr].thr = kthread_run(compress_threadfn,
-		                            &data[thr],
-		                            "image_compress/%u", thr);
-		if (IS_ERR(data[thr].thr)) {
-			data[thr].thr = NULL;
-			pr_err("Cannot start compression threads\n");
-			ret = -ENOMEM;
-			goto out_clean;
-		}
-	}
-
-	/*
-	 * Start the CRC32 thread.
-	 */
-	init_waitqueue_head(&crc->go);
-	init_waitqueue_head(&crc->done);
-
-	handle->crc32 = 0;
-	crc->crc32 = &handle->crc32;
-	for (thr = 0; thr < nr_threads; thr++) {
-		crc->unc[thr] = data[thr].unc;
-		crc->unc_len[thr] = &data[thr].unc_len;
-	}
-
-	crc->thr = kthread_run(crc32_threadfn, crc, "image_crc32");
-	if (IS_ERR(crc->thr)) {
-		crc->thr = NULL;
-		pr_err("Cannot start CRC32 thread\n");
-		ret = -ENOMEM;
-		goto out_clean;
-	}
-
-	/*
-	 * Adjust the number of required free pages after all allocations have
-	 * been done. We don't want to run out of pages when writing.
-	 */
-	handle->reqd_free_pages = reqd_free_pages();
-
-	pr_info("Using %u thread(s) for %s compression\n", nr_threads, hib_comp_algo);
-	pr_info("Compressing and saving image data (%u pages)...\n",
-		nr_to_write);
-	m = nr_to_write / 10;
-	if (!m)
-		m = 1;
-	nr_pages = 0;
-	start = ktime_get();
-	for (;;) {
-		for (thr = 0; thr < nr_threads; thr++) {
-			for (off = 0; off < UNC_SIZE; off += PAGE_SIZE) {
-				ret = snapshot_read_next(snapshot);
-				if (ret < 0)
-					goto out_finish;
-
-				if (!ret)
-					break;
-
-				memcpy(data[thr].unc + off,
-				       data_of(*snapshot), PAGE_SIZE);
-
-				if (!(nr_pages % m))
-					pr_info("Image saving progress: %3d%%\n",
-						nr_pages / m * 10);
-				nr_pages++;
-			}
-			if (!off)
-				break;
-
-			data[thr].unc_len = off;
-
-			atomic_set_release(&data[thr].ready, 1);
-			wake_up(&data[thr].go);
-		}
-
-		if (!thr)
-			break;
-
-		crc->run_threads = thr;
-		atomic_set_release(&crc->ready, 1);
-		wake_up(&crc->go);
-
-		for (run_threads = thr, thr = 0; thr < run_threads; thr++) {
-			wait_event(data[thr].done,
-				atomic_read_acquire(&data[thr].stop));
-			atomic_set(&data[thr].stop, 0);
-
-			ret = data[thr].ret;
-
-			if (ret < 0) {
-				pr_err("%s compression failed\n", hib_comp_algo);
-				goto out_finish;
-			}
-
-			if (unlikely(!data[thr].cmp_len ||
-			             data[thr].cmp_len >
-				     bytes_worst_compress(data[thr].unc_len))) {
-				pr_err("Invalid %s compressed length\n", hib_comp_algo);
-				ret = -1;
-				goto out_finish;
-			}
-
-			*(size_t *)data[thr].cmp = data[thr].cmp_len;
-
-			/*
-			 * Given we are writing one page at a time to disk, we
-			 * copy that much from the buffer, although the last
-			 * bit will likely be smaller than full page. This is
-			 * OK - we saved the length of the compressed data, so
-			 * any garbage at the end will be discarded when we
-			 * read it.
-			 */
-			for (off = 0;
-			     off < CMP_HEADER + data[thr].cmp_len;
-			     off += PAGE_SIZE) {
-				memcpy(page, data[thr].cmp + off, PAGE_SIZE);
-
-				ret = swap_write_page(handle, page, &hb);
-				if (ret)
-					goto out_finish;
-			}
-		}
-
-		wait_event(crc->done, atomic_read_acquire(&crc->stop));
-		atomic_set(&crc->stop, 0);
-	}
-
-out_finish:
-	err2 = hib_wait_io(&hb);
-	stop = ktime_get();
-	if (!ret)
-		ret = err2;
-	if (!ret)
-		pr_info("Image saving done\n");
-	swsusp_show_speed(start, stop, nr_to_write, "Wrote");
-	pr_info("Image size after compression: %d kbytes\n",
-		(atomic_read(&compressed_size) / 1024));
-
-out_clean:
-	hib_finish_batch(&hb);
-	if (crc) {
-		if (crc->thr)
-			kthread_stop(crc->thr);
-		kfree(crc);
-	}
-	if (data) {
-		for (thr = 0; thr < nr_threads; thr++) {
-			if (data[thr].thr)
-				kthread_stop(data[thr].thr);
-			if (data[thr].cc)
-				crypto_free_comp(data[thr].cc);
-		}
-		vfree(data);
-	}
-	if (page) free_page((unsigned long)page);
-
-	return ret;
-}
-
-/**
- *	enough_swap - Make sure we have enough swap to save the image.
- *
- *	Returns TRUE or FALSE after checking the total amount of swap
- *	space available from the resume partition.
- */
-
-static int enough_swap(unsigned int nr_pages)
-{
-	unsigned int free_swap = count_swap_pages(root_swap, 1);
-	unsigned int required;
-
-	pr_debug("Free swap pages: %u\n", free_swap);
-
-	required = PAGES_FOR_IO + nr_pages;
-	return free_swap > required;
-}
-
-/**
- *	swsusp_write - Write entire image and metadata.
- *	@flags: flags to pass to the "boot" kernel in the image header
- *
- *	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.)
- */
-
-int swsusp_write(unsigned int flags)
-{
-	struct swap_map_handle handle;
-	struct snapshot_handle snapshot;
-	struct swsusp_info *header;
-	unsigned long pages;
-	int error;
-
-	pages = snapshot_get_image_size();
-	error = get_swap_writer(&handle);
-	if (error) {
-		pr_err("Cannot get swap writer\n");
-		return error;
-	}
-	if (flags & SF_NOCOMPRESS_MODE) {
-		if (!enough_swap(pages)) {
-			pr_err("Not enough free swap\n");
-			error = -ENOSPC;
-			goto out_finish;
-		}
-	}
-	memset(&snapshot, 0, sizeof(struct snapshot_handle));
-	error = snapshot_read_next(&snapshot);
-	if (error < (int)PAGE_SIZE) {
-		if (error >= 0)
-			error = -EFAULT;
-
-		goto out_finish;
-	}
-	header = (struct swsusp_info *)data_of(snapshot);
-	error = swap_write_page(&handle, header, NULL);
-	if (!error) {
-		error = (flags & SF_NOCOMPRESS_MODE) ?
-			save_image(&handle, &snapshot, pages - 1) :
-			save_compressed_image(&handle, &snapshot, pages - 1);
-	}
-out_finish:
-	error = swap_writer_finish(&handle, flags, error);
-	return error;
-}
-
-/*
- *	The following functions allow us to read data using a swap map
- *	in a file-like way.
- */
-
-static void release_swap_reader(struct swap_map_handle *handle)
-{
-	struct swap_map_page_list *tmp;
-
-	while (handle->maps) {
-		if (handle->maps->map)
-			free_page((unsigned long)handle->maps->map);
-		tmp = handle->maps;
-		handle->maps = handle->maps->next;
-		kfree(tmp);
-	}
-	handle->cur = NULL;
-}
-
-static int get_swap_reader(struct swap_map_handle *handle,
-		unsigned int *flags_p)
-{
-	int error;
-	struct swap_map_page_list *tmp, *last;
-	sector_t offset;
-
-	*flags_p = swsusp_header->flags;
-
-	if (!swsusp_header->image) /* how can this happen? */
-		return -EINVAL;
-
-	handle->cur = NULL;
-	last = handle->maps = NULL;
-	offset = swsusp_header->image;
-	while (offset) {
-		tmp = kzalloc(sizeof(*handle->maps), GFP_KERNEL);
-		if (!tmp) {
-			release_swap_reader(handle);
-			return -ENOMEM;
-		}
-		if (!handle->maps)
-			handle->maps = tmp;
-		if (last)
-			last->next = tmp;
-		last = tmp;
-
-		tmp->map = (struct swap_map_page *)
-			   __get_free_page(GFP_NOIO | __GFP_HIGH);
-		if (!tmp->map) {
-			release_swap_reader(handle);
-			return -ENOMEM;
-		}
-
-		error = hib_submit_io(REQ_OP_READ, offset, tmp->map, NULL);
-		if (error) {
-			release_swap_reader(handle);
-			return error;
-		}
-		offset = tmp->map->next_swap;
-	}
-	handle->k = 0;
-	handle->cur = handle->maps->map;
-	return 0;
-}
-
-static int swap_read_page(struct swap_map_handle *handle, void *buf,
-		struct hib_bio_batch *hb)
-{
-	sector_t offset;
-	int error;
-	struct swap_map_page_list *tmp;
-
-	if (!handle->cur)
-		return -EINVAL;
-	offset = handle->cur->entries[handle->k];
-	if (!offset)
-		return -EFAULT;
-	error = hib_submit_io(REQ_OP_READ, offset, buf, hb);
-	if (error)
-		return error;
-	if (++handle->k >= MAP_PAGE_ENTRIES) {
-		handle->k = 0;
-		free_page((unsigned long)handle->maps->map);
-		tmp = handle->maps;
-		handle->maps = handle->maps->next;
-		kfree(tmp);
-		if (!handle->maps)
-			release_swap_reader(handle);
-		else
-			handle->cur = handle->maps->map;
-	}
-	return error;
-}
-
-static int swap_reader_finish(struct swap_map_handle *handle)
-{
-	release_swap_reader(handle);
-
-	return 0;
-}
-
-/**
- *	load_image - load the image using the swap map handle
- *	@handle and the snapshot handle @snapshot
- *	(assume there are @nr_pages pages to load)
- */
-
-static int load_image(struct swap_map_handle *handle,
-                      struct snapshot_handle *snapshot,
-                      unsigned int nr_to_read)
-{
-	unsigned int m;
-	int ret = 0;
-	ktime_t start;
-	ktime_t stop;
-	struct hib_bio_batch hb;
-	int err2;
-	unsigned nr_pages;
-
-	hib_init_batch(&hb);
-
-	clean_pages_on_read = true;
-	pr_info("Loading image data pages (%u pages)...\n", nr_to_read);
-	m = nr_to_read / 10;
-	if (!m)
-		m = 1;
-	nr_pages = 0;
-	start = ktime_get();
-	for ( ; ; ) {
-		ret = snapshot_write_next(snapshot);
-		if (ret <= 0)
-			break;
-		ret = swap_read_page(handle, data_of(*snapshot), &hb);
-		if (ret)
-			break;
-		if (snapshot->sync_read)
-			ret = hib_wait_io(&hb);
-		if (ret)
-			break;
-		if (!(nr_pages % m))
-			pr_info("Image loading progress: %3d%%\n",
-				nr_pages / m * 10);
-		nr_pages++;
-	}
-	err2 = hib_wait_io(&hb);
-	hib_finish_batch(&hb);
-	stop = ktime_get();
-	if (!ret)
-		ret = err2;
-	if (!ret) {
-		pr_info("Image loading done\n");
-		ret = snapshot_write_finalize(snapshot);
-		if (!ret && !snapshot_image_loaded(snapshot))
-			ret = -ENODATA;
-	}
-	swsusp_show_speed(start, stop, nr_to_read, "Read");
-	return ret;
-}
-
-/*
- * Structure used for data decompression.
- */
-struct dec_data {
-	struct task_struct *thr;                  /* thread */
-	struct crypto_comp *cc;                   /* crypto compressor stream */
-	atomic_t ready;                           /* ready to start flag */
-	atomic_t stop;                            /* ready to stop flag */
-	int ret;                                  /* return code */
-	wait_queue_head_t go;                     /* start decompression */
-	wait_queue_head_t done;                   /* decompression done */
-	size_t unc_len;                           /* uncompressed length */
-	size_t cmp_len;                           /* compressed length */
-	unsigned char unc[UNC_SIZE];              /* uncompressed buffer */
-	unsigned char cmp[CMP_SIZE];              /* compressed buffer */
-};
-
-/*
- * Decompression function that runs in its own thread.
- */
-static int decompress_threadfn(void *data)
-{
-	struct dec_data *d = data;
-	unsigned int unc_len = 0;
-
-	while (1) {
-		wait_event(d->go, atomic_read_acquire(&d->ready) ||
-		                  kthread_should_stop());
-		if (kthread_should_stop()) {
-			d->thr = NULL;
-			d->ret = -1;
-			atomic_set_release(&d->stop, 1);
-			wake_up(&d->done);
-			break;
-		}
-		atomic_set(&d->ready, 0);
-
-		unc_len = UNC_SIZE;
-		d->ret = crypto_comp_decompress(d->cc, d->cmp + CMP_HEADER, d->cmp_len,
-						d->unc, &unc_len);
-		d->unc_len = unc_len;
-
-		if (clean_pages_on_decompress)
-			flush_icache_range((unsigned long)d->unc,
-					   (unsigned long)d->unc + d->unc_len);
-
-		atomic_set_release(&d->stop, 1);
-		wake_up(&d->done);
-	}
-	return 0;
-}
-
-/**
- * load_compressed_image - Load compressed image data and decompress it.
- * @handle: Swap map handle to use for loading data.
- * @snapshot: Image to copy uncompressed data into.
- * @nr_to_read: Number of pages to load.
- */
-static int load_compressed_image(struct swap_map_handle *handle,
-				 struct snapshot_handle *snapshot,
-				 unsigned int nr_to_read)
-{
-	unsigned int m;
-	int ret = 0;
-	int eof = 0;
-	struct hib_bio_batch hb;
-	ktime_t start;
-	ktime_t stop;
-	unsigned nr_pages;
-	size_t off;
-	unsigned i, thr, run_threads, nr_threads;
-	unsigned ring = 0, pg = 0, ring_size = 0,
-	         have = 0, want, need, asked = 0;
-	unsigned long read_pages = 0;
-	unsigned char **page = NULL;
-	struct dec_data *data = NULL;
-	struct crc_data *crc = NULL;
-
-	hib_init_batch(&hb);
-
-	/*
-	 * We'll limit the number of threads for decompression to limit memory
-	 * footprint.
-	 */
-	nr_threads = num_online_cpus() - 1;
-	nr_threads = clamp_val(nr_threads, 1, CMP_THREADS);
-
-	page = vmalloc(array_size(CMP_MAX_RD_PAGES, sizeof(*page)));
-	if (!page) {
-		pr_err("Failed to allocate %s page\n", hib_comp_algo);
-		ret = -ENOMEM;
-		goto out_clean;
-	}
-
-	data = vzalloc(array_size(nr_threads, sizeof(*data)));
-	if (!data) {
-		pr_err("Failed to allocate %s data\n", hib_comp_algo);
-		ret = -ENOMEM;
-		goto out_clean;
-	}
-
-	crc = kzalloc(sizeof(*crc), GFP_KERNEL);
-	if (!crc) {
-		pr_err("Failed to allocate crc\n");
-		ret = -ENOMEM;
-		goto out_clean;
-	}
-
-	clean_pages_on_decompress = true;
-
-	/*
-	 * Start the decompression threads.
-	 */
-	for (thr = 0; thr < nr_threads; thr++) {
-		init_waitqueue_head(&data[thr].go);
-		init_waitqueue_head(&data[thr].done);
-
-		data[thr].cc = crypto_alloc_comp(hib_comp_algo, 0, 0);
-		if (IS_ERR_OR_NULL(data[thr].cc)) {
-			pr_err("Could not allocate comp stream %ld\n", PTR_ERR(data[thr].cc));
-			ret = -EFAULT;
-			goto out_clean;
-		}
-
-		data[thr].thr = kthread_run(decompress_threadfn,
-		                            &data[thr],
-		                            "image_decompress/%u", thr);
-		if (IS_ERR(data[thr].thr)) {
-			data[thr].thr = NULL;
-			pr_err("Cannot start decompression threads\n");
-			ret = -ENOMEM;
-			goto out_clean;
-		}
-	}
-
-	/*
-	 * Start the CRC32 thread.
-	 */
-	init_waitqueue_head(&crc->go);
-	init_waitqueue_head(&crc->done);
-
-	handle->crc32 = 0;
-	crc->crc32 = &handle->crc32;
-	for (thr = 0; thr < nr_threads; thr++) {
-		crc->unc[thr] = data[thr].unc;
-		crc->unc_len[thr] = &data[thr].unc_len;
-	}
-
-	crc->thr = kthread_run(crc32_threadfn, crc, "image_crc32");
-	if (IS_ERR(crc->thr)) {
-		crc->thr = NULL;
-		pr_err("Cannot start CRC32 thread\n");
-		ret = -ENOMEM;
-		goto out_clean;
-	}
-
-	/*
-	 * Set the number of pages for read buffering.
-	 * This is complete guesswork, because we'll only know the real
-	 * picture once prepare_image() is called, which is much later on
-	 * during the image load phase. We'll assume the worst case and
-	 * say that none of the image pages are from high memory.
-	 */
-	if (low_free_pages() > snapshot_get_image_size())
-		read_pages = (low_free_pages() - snapshot_get_image_size()) / 2;
-	read_pages = clamp_val(read_pages, CMP_MIN_RD_PAGES, CMP_MAX_RD_PAGES);
-
-	for (i = 0; i < read_pages; i++) {
-		page[i] = (void *)__get_free_page(i < CMP_PAGES ?
-						  GFP_NOIO | __GFP_HIGH :
-						  GFP_NOIO | __GFP_NOWARN |
-						  __GFP_NORETRY);
-
-		if (!page[i]) {
-			if (i < CMP_PAGES) {
-				ring_size = i;
-				pr_err("Failed to allocate %s pages\n", hib_comp_algo);
-				ret = -ENOMEM;
-				goto out_clean;
-			} else {
-				break;
-			}
-		}
-	}
-	want = ring_size = i;
-
-	pr_info("Using %u thread(s) for %s decompression\n", nr_threads, hib_comp_algo);
-	pr_info("Loading and decompressing image data (%u pages)...\n",
-		nr_to_read);
-	m = nr_to_read / 10;
-	if (!m)
-		m = 1;
-	nr_pages = 0;
-	start = ktime_get();
-
-	ret = snapshot_write_next(snapshot);
-	if (ret <= 0)
-		goto out_finish;
-
-	for(;;) {
-		for (i = 0; !eof && i < want; i++) {
-			ret = swap_read_page(handle, page[ring], &hb);
-			if (ret) {
-				/*
-				 * On real read error, finish. On end of data,
-				 * set EOF flag and just exit the read loop.
-				 */
-				if (handle->cur &&
-				    handle->cur->entries[handle->k]) {
-					goto out_finish;
-				} else {
-					eof = 1;
-					break;
-				}
-			}
-			if (++ring >= ring_size)
-				ring = 0;
-		}
-		asked += i;
-		want -= i;
-
-		/*
-		 * We are out of data, wait for some more.
-		 */
-		if (!have) {
-			if (!asked)
-				break;
-
-			ret = hib_wait_io(&hb);
-			if (ret)
-				goto out_finish;
-			have += asked;
-			asked = 0;
-			if (eof)
-				eof = 2;
-		}
-
-		if (crc->run_threads) {
-			wait_event(crc->done, atomic_read_acquire(&crc->stop));
-			atomic_set(&crc->stop, 0);
-			crc->run_threads = 0;
-		}
-
-		for (thr = 0; have && thr < nr_threads; thr++) {
-			data[thr].cmp_len = *(size_t *)page[pg];
-			if (unlikely(!data[thr].cmp_len ||
-			             data[thr].cmp_len >
-					bytes_worst_compress(UNC_SIZE))) {
-				pr_err("Invalid %s compressed length\n", hib_comp_algo);
-				ret = -1;
-				goto out_finish;
-			}
-
-			need = DIV_ROUND_UP(data[thr].cmp_len + CMP_HEADER,
-			                    PAGE_SIZE);
-			if (need > have) {
-				if (eof > 1) {
-					ret = -1;
-					goto out_finish;
-				}
-				break;
-			}
-
-			for (off = 0;
-			     off < CMP_HEADER + data[thr].cmp_len;
-			     off += PAGE_SIZE) {
-				memcpy(data[thr].cmp + off,
-				       page[pg], PAGE_SIZE);
-				have--;
-				want++;
-				if (++pg >= ring_size)
-					pg = 0;
-			}
-
-			atomic_set_release(&data[thr].ready, 1);
-			wake_up(&data[thr].go);
-		}
-
-		/*
-		 * Wait for more data while we are decompressing.
-		 */
-		if (have < CMP_PAGES && asked) {
-			ret = hib_wait_io(&hb);
-			if (ret)
-				goto out_finish;
-			have += asked;
-			asked = 0;
-			if (eof)
-				eof = 2;
-		}
-
-		for (run_threads = thr, thr = 0; thr < run_threads; thr++) {
-			wait_event(data[thr].done,
-				atomic_read_acquire(&data[thr].stop));
-			atomic_set(&data[thr].stop, 0);
-
-			ret = data[thr].ret;
-
-			if (ret < 0) {
-				pr_err("%s decompression failed\n", hib_comp_algo);
-				goto out_finish;
-			}
-
-			if (unlikely(!data[thr].unc_len ||
-				data[thr].unc_len > UNC_SIZE ||
-				data[thr].unc_len & (PAGE_SIZE - 1))) {
-				pr_err("Invalid %s uncompressed length\n", hib_comp_algo);
-				ret = -1;
-				goto out_finish;
-			}
-
-			for (off = 0;
-			     off < data[thr].unc_len; off += PAGE_SIZE) {
-				memcpy(data_of(*snapshot),
-				       data[thr].unc + off, PAGE_SIZE);
-
-				if (!(nr_pages % m))
-					pr_info("Image loading progress: %3d%%\n",
-						nr_pages / m * 10);
-				nr_pages++;
-
-				ret = snapshot_write_next(snapshot);
-				if (ret <= 0) {
-					crc->run_threads = thr + 1;
-					atomic_set_release(&crc->ready, 1);
-					wake_up(&crc->go);
-					goto out_finish;
-				}
-			}
-		}
-
-		crc->run_threads = thr;
-		atomic_set_release(&crc->ready, 1);
-		wake_up(&crc->go);
-	}
-
-out_finish:
-	if (crc->run_threads) {
-		wait_event(crc->done, atomic_read_acquire(&crc->stop));
-		atomic_set(&crc->stop, 0);
-	}
-	stop = ktime_get();
-	if (!ret) {
-		pr_info("Image loading done\n");
-		ret = snapshot_write_finalize(snapshot);
-		if (!ret && !snapshot_image_loaded(snapshot))
-			ret = -ENODATA;
-		if (!ret) {
-			if (swsusp_header->flags & SF_CRC32_MODE) {
-				if(handle->crc32 != swsusp_header->crc32) {
-					pr_err("Invalid image CRC32!\n");
-					ret = -ENODATA;
-				}
-			}
-		}
-	}
-	swsusp_show_speed(start, stop, nr_to_read, "Read");
-out_clean:
-	hib_finish_batch(&hb);
-	for (i = 0; i < ring_size; i++)
-		free_page((unsigned long)page[i]);
-	if (crc) {
-		if (crc->thr)
-			kthread_stop(crc->thr);
-		kfree(crc);
-	}
-	if (data) {
-		for (thr = 0; thr < nr_threads; thr++) {
-			if (data[thr].thr)
-				kthread_stop(data[thr].thr);
-			if (data[thr].cc)
-				crypto_free_comp(data[thr].cc);
-		}
-		vfree(data);
-	}
-	vfree(page);
-
-	return ret;
-}
-
-/**
- *	swsusp_read - read the hibernation image.
- *	@flags_p: flags passed by the "frozen" kernel in the image header should
- *		  be written into this memory location
- */
-
-int swsusp_read(unsigned int *flags_p)
-{
-	int error;
-	struct swap_map_handle handle;
-	struct snapshot_handle snapshot;
-	struct swsusp_info *header;
-
-	memset(&snapshot, 0, sizeof(struct snapshot_handle));
-	error = snapshot_write_next(&snapshot);
-	if (error < (int)PAGE_SIZE)
-		return error < 0 ? error : -EFAULT;
-	header = (struct swsusp_info *)data_of(snapshot);
-	error = get_swap_reader(&handle, flags_p);
-	if (error)
-		goto end;
-	if (!error)
-		error = swap_read_page(&handle, header, NULL);
-	if (!error) {
-		error = (*flags_p & SF_NOCOMPRESS_MODE) ?
-			load_image(&handle, &snapshot, header->pages - 1) :
-			load_compressed_image(&handle, &snapshot, header->pages - 1);
-	}
-	swap_reader_finish(&handle);
-end:
-	if (!error)
-		pr_debug("Image successfully loaded\n");
-	else
-		pr_debug("Error %d resuming\n", error);
-	return error;
-}
-
-static void *swsusp_holder;
-
-/**
- * swsusp_check - Open the resume device and check for the swsusp signature.
- * @exclusive: Open the resume device exclusively.
- */
-
-int swsusp_check(bool exclusive)
-{
-	void *holder = exclusive ? &swsusp_holder : NULL;
-	int error;
-
-	hib_resume_bdev_file = bdev_file_open_by_dev(swsusp_resume_device,
-				BLK_OPEN_READ, holder, NULL);
-	if (!IS_ERR(hib_resume_bdev_file)) {
-		set_blocksize(file_bdev(hib_resume_bdev_file), PAGE_SIZE);
-		clear_page(swsusp_header);
-		error = hib_submit_io(REQ_OP_READ, swsusp_resume_block,
-					swsusp_header, NULL);
-		if (error)
-			goto put;
-
-		if (!memcmp(HIBERNATE_SIG, swsusp_header->sig, 10)) {
-			memcpy(swsusp_header->sig, swsusp_header->orig_sig, 10);
-			swsusp_header_flags = swsusp_header->flags;
-			/* Reset swap signature now */
-			error = hib_submit_io(REQ_OP_WRITE | REQ_SYNC,
-						swsusp_resume_block,
-						swsusp_header, NULL);
-		} else {
-			error = -EINVAL;
-		}
-		if (!error && swsusp_header->flags & SF_HW_SIG &&
-		    swsusp_header->hw_sig != swsusp_hardware_signature) {
-			pr_info("Suspend image hardware signature mismatch (%08x now %08x); aborting resume.\n",
-				swsusp_header->hw_sig, swsusp_hardware_signature);
-			error = -EINVAL;
-		}
-
-put:
-		if (error)
-			fput(hib_resume_bdev_file);
-		else
-			pr_debug("Image signature found, resuming\n");
-	} else {
-		error = PTR_ERR(hib_resume_bdev_file);
-	}
-
-	if (error)
-		pr_debug("Image not found (code %d)\n", error);
-
-	return error;
-}
-
-/**
- * swsusp_close - close resume device.
- */
-
-void swsusp_close(void)
-{
-	if (IS_ERR(hib_resume_bdev_file)) {
-		pr_debug("Image device not initialised\n");
-		return;
-	}
-
-	fput(hib_resume_bdev_file);
-}
-
-/**
- *      swsusp_unmark - Unmark swsusp signature in the resume device
- */
-
-#ifdef CONFIG_SUSPEND
-int swsusp_unmark(void)
-{
-	int error;
-
-	hib_submit_io(REQ_OP_READ, swsusp_resume_block,
-			swsusp_header, NULL);
-	if (!memcmp(HIBERNATE_SIG,swsusp_header->sig, 10)) {
-		memcpy(swsusp_header->sig,swsusp_header->orig_sig, 10);
-		error = hib_submit_io(REQ_OP_WRITE | REQ_SYNC,
-					swsusp_resume_block,
-					swsusp_header, NULL);
-	} else {
-		pr_err("Cannot find swsusp signature!\n");
-		error = -ENODEV;
-	}
-
-	/*
-	 * We just returned from suspend, we don't need the image any more.
-	 */
-	free_all_swap_pages(root_swap);
-
-	return error;
-}
-#endif
-
-static int __init swsusp_header_init(void)
-{
-	swsusp_header = (struct swsusp_header*) __get_free_page(GFP_KERNEL);
-	if (!swsusp_header)
-		panic("Could not allocate memory for swsusp_header\n");
-	return 0;
-}
-
-core_initcall(swsusp_header_init);
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * linux/kernel/power/swap.c
+ *
+ * This file provides functions for reading the suspend image from
+ * and writing it to a swap partition.
+ *
+ * Copyright (C) 1998,2001-2005 Pavel Machek <pavel@ucw.cz>
+ * Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl>
+ * Copyright (C) 2010-2012 Bojan Smojver <bojan@rexursive.com>
+ */
+
+#define pr_fmt(fmt) "PM: " fmt
+
+#include <linux/module.h>
+#include <linux/file.h>
+#include <linux/delay.h>
+#include <linux/bitops.h>
+#include <linux/device.h>
+#include <linux/bio.h>
+#include <linux/blkdev.h>
+#include <linux/swap.h>
+#include <linux/swapops.h>
+#include <linux/pm.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/cpumask.h>
+#include <linux/atomic.h>
+#include <linux/kthread.h>
+#include <linux/crc32.h>
+#include <linux/ktime.h>
+
+#include "power.h"
+
+#define HIBERNATE_SIG	"S1SUSPEND"
+
+u32 swsusp_hardware_signature;
+
+/*
+ * When reading an {un,}compressed image, we may restore pages in place,
+ * in which case some architectures need these pages cleaning before they
+ * can be executed. We don't know which pages these may be, so clean the lot.
+ */
+static bool clean_pages_on_decompress;
+
+/*
+ *	The swap map is a data structure used for keeping track of each page
+ *	written to a swap partition.  It consists of many swap_map_page
+ *	structures that contain each an array of MAP_PAGE_ENTRIES swap entries.
+ *	These structures are stored on the swap and linked together with the
+ *	help of the .next_swap member.
+ *
+ *	The swap map is created during suspend.  The swap map pages are
+ *	allocated and populated one at a time, so we only need one memory
+ *	page to set up the entire structure.
+ *
+ *	During resume we pick up all swap_map_page structures into a list.
+ */
+
+#define MAP_PAGE_ENTRIES	(PAGE_SIZE / sizeof(sector_t) - 1)
+
+/*
+ * Number of free pages that are not high.
+ */
+static inline unsigned long low_free_pages(void)
+{
+	return nr_free_pages() - nr_free_highpages();
+}
+
+/*
+ * Number of pages required to be kept free while writing the image. Always
+ * half of all available low pages before the writing starts.
+ */
+static inline unsigned long reqd_free_pages(void)
+{
+	return low_free_pages() / 2;
+}
+
+struct swap_map_page {
+	sector_t entries[MAP_PAGE_ENTRIES];
+	sector_t next_swap;
+};
+
+struct swap_map_page_list {
+	struct swap_map_page *map;
+	struct swap_map_page_list *next;
+};
+
+/*
+ *	The swap_map_handle structure is used for handling swap in
+ *	a file-alike way
+ */
+
+struct swap_map_handle {
+	struct swap_map_page *cur;
+	struct swap_map_page_list *maps;
+	sector_t cur_swap;
+	sector_t first_sector;
+	unsigned int k;
+	unsigned long reqd_free_pages;
+	u32 crc32;
+};
+
+struct swsusp_header {
+	char reserved[PAGE_SIZE - 20 - sizeof(sector_t) - sizeof(int) -
+	              sizeof(u32) - sizeof(u32)];
+	u32	hw_sig;
+	u32	crc32;
+	sector_t image;
+	unsigned int flags;	/* Flags to pass to the "boot" kernel */
+	char	orig_sig[10];
+	char	sig[10];
+} __packed;
+
+static struct swsusp_header *swsusp_header;
+
+/*
+ *	The following functions are used for tracing the allocated
+ *	swap pages, so that they can be freed in case of an error.
+ */
+
+struct swsusp_extent {
+	struct rb_node node;
+	unsigned long start;
+	unsigned long end;
+};
+
+static struct rb_root swsusp_extents = RB_ROOT;
+
+static int swsusp_extents_insert(unsigned long swap_offset)
+{
+	struct rb_node **new = &(swsusp_extents.rb_node);
+	struct rb_node *parent = NULL;
+	struct swsusp_extent *ext;
+
+	/* Figure out where to put the new node */
+	while (*new) {
+		ext = rb_entry(*new, struct swsusp_extent, node);
+		parent = *new;
+		if (swap_offset < ext->start) {
+			/* Try to merge */
+			if (swap_offset == ext->start - 1) {
+				ext->start--;
+				return 0;
+			}
+			new = &((*new)->rb_left);
+		} else if (swap_offset > ext->end) {
+			/* Try to merge */
+			if (swap_offset == ext->end + 1) {
+				ext->end++;
+				return 0;
+			}
+			new = &((*new)->rb_right);
+		} else {
+			/* It already is in the tree */
+			return -EINVAL;
+		}
+	}
+	/* Add the new node and rebalance the tree. */
+	ext = kzalloc(sizeof(struct swsusp_extent), GFP_KERNEL);
+	if (!ext)
+		return -ENOMEM;
+
+	ext->start = swap_offset;
+	ext->end = swap_offset;
+	rb_link_node(&ext->node, parent, new);
+	rb_insert_color(&ext->node, &swsusp_extents);
+	return 0;
+}
+
+/*
+ *	alloc_swapdev_block - allocate a swap page and register that it has
+ *	been allocated, so that it can be freed in case of an error.
+ */
+
+sector_t alloc_swapdev_block(int swap)
+{
+	unsigned long offset;
+
+	offset = swp_offset(get_swap_page_of_type(swap));
+	if (offset) {
+		if (swsusp_extents_insert(offset))
+			swap_free(swp_entry(swap, offset));
+		else
+			return swapdev_block(swap, offset);
+	}
+	return 0;
+}
+
+/*
+ *	free_all_swap_pages - free swap pages allocated for saving image data.
+ *	It also frees the extents used to register which swap entries had been
+ *	allocated.
+ */
+
+void free_all_swap_pages(int swap)
+{
+	struct rb_node *node;
+
+	while ((node = swsusp_extents.rb_node)) {
+		struct swsusp_extent *ext;
+		unsigned long offset;
+
+		ext = rb_entry(node, struct swsusp_extent, node);
+		rb_erase(node, &swsusp_extents);
+		for (offset = ext->start; offset <= ext->end; offset++)
+			swap_free(swp_entry(swap, offset));
+
+		kfree(ext);
+	}
+}
+
+int swsusp_swap_in_use(void)
+{
+	return (swsusp_extents.rb_node != NULL);
+}
+
+/*
+ * General things
+ */
+
+static unsigned short root_swap = 0xffff;
+static struct file *hib_resume_bdev_file;
+
+struct hib_bio_batch {
+	atomic_t		count;
+	wait_queue_head_t	wait;
+	blk_status_t		error;
+	struct blk_plug		plug;
+};
+
+static void hib_init_batch(struct hib_bio_batch *hb)
+{
+	atomic_set(&hb->count, 0);
+	init_waitqueue_head(&hb->wait);
+	hb->error = BLK_STS_OK;
+	blk_start_plug(&hb->plug);
+}
+
+static void hib_finish_batch(struct hib_bio_batch *hb)
+{
+	blk_finish_plug(&hb->plug);
+}
+
+static void hib_end_io(struct bio *bio)
+{
+	struct hib_bio_batch *hb = bio->bi_private;
+	struct page *page = bio_first_page_all(bio);
+
+	if (bio->bi_status) {
+		pr_alert("Read-error on swap-device (%u:%u:%Lu)\n",
+			 MAJOR(bio_dev(bio)), MINOR(bio_dev(bio)),
+			 (unsigned long long)bio->bi_iter.bi_sector);
+	}
+
+	if (bio_data_dir(bio) == WRITE)
+		put_page(page);
+
+	if (bio->bi_status && !hb->error)
+		hb->error = bio->bi_status;
+	if (atomic_dec_and_test(&hb->count))
+		wake_up(&hb->wait);
+
+	bio_put(bio);
+}
+
+static int hib_submit_io(blk_opf_t opf, pgoff_t page_off, void *addr,
+			 struct hib_bio_batch *hb)
+{
+	struct page *page = virt_to_page(addr);
+	struct bio *bio;
+	int error = 0;
+
+	bio = bio_alloc(file_bdev(hib_resume_bdev_file), 1, opf,
+			GFP_NOIO | __GFP_HIGH);
+	bio->bi_iter.bi_sector = page_off * (PAGE_SIZE >> 9);
+
+	if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
+		pr_err("Adding page to bio failed at %llu\n",
+		       (unsigned long long)bio->bi_iter.bi_sector);
+		bio_put(bio);
+		return -EFAULT;
+	}
+
+	if (hb) {
+		bio->bi_end_io = hib_end_io;
+		bio->bi_private = hb;
+		atomic_inc(&hb->count);
+		submit_bio(bio);
+	} else {
+		error = submit_bio_wait(bio);
+		bio_put(bio);
+	}
+
+	return error;
+}
+
+static int hib_wait_io(struct hib_bio_batch *hb)
+{
+	/*
+	 * We are relying on the behavior of blk_plug that a thread with
+	 * a plug will flush the plug list before sleeping.
+	 */
+	wait_event(hb->wait, atomic_read(&hb->count) == 0);
+	return blk_status_to_errno(hb->error);
+}
+
+/*
+ * Saving part
+ */
+static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags)
+{
+	int error;
+
+	hib_submit_io(REQ_OP_READ, swsusp_resume_block, swsusp_header, NULL);
+	if (!memcmp("SWAP-SPACE",swsusp_header->sig, 10) ||
+	    !memcmp("SWAPSPACE2",swsusp_header->sig, 10)) {
+		memcpy(swsusp_header->orig_sig,swsusp_header->sig, 10);
+		memcpy(swsusp_header->sig, HIBERNATE_SIG, 10);
+		swsusp_header->image = handle->first_sector;
+		if (swsusp_hardware_signature) {
+			swsusp_header->hw_sig = swsusp_hardware_signature;
+			flags |= SF_HW_SIG;
+		}
+		swsusp_header->flags = flags;
+		if (flags & SF_CRC32_MODE)
+			swsusp_header->crc32 = handle->crc32;
+		error = hib_submit_io(REQ_OP_WRITE | REQ_SYNC,
+				      swsusp_resume_block, swsusp_header, NULL);
+	} else {
+		pr_err("Swap header not found!\n");
+		error = -ENODEV;
+	}
+	return error;
+}
+
+/*
+ * Hold the swsusp_header flag. This is used in software_resume() in
+ * 'kernel/power/hibernate' to check if the image is compressed and query
+ * for the compression algorithm support(if so).
+ */
+unsigned int swsusp_header_flags;
+
+/**
+ *	swsusp_swap_check - check if the resume device is a swap device
+ *	and get its index (if so)
+ *
+ *	This is called before saving image
+ */
+static int swsusp_swap_check(void)
+{
+	int res;
+
+	if (swsusp_resume_device)
+		res = swap_type_of(swsusp_resume_device, swsusp_resume_block);
+	else
+		res = find_first_swap(&swsusp_resume_device);
+	if (res < 0)
+		return res;
+	root_swap = res;
+
+	hib_resume_bdev_file = bdev_file_open_by_dev(swsusp_resume_device,
+			BLK_OPEN_WRITE, NULL, NULL);
+	if (IS_ERR(hib_resume_bdev_file))
+		return PTR_ERR(hib_resume_bdev_file);
+
+	res = set_blocksize(file_bdev(hib_resume_bdev_file), PAGE_SIZE);
+	if (res < 0)
+		fput(hib_resume_bdev_file);
+
+	return res;
+}
+
+/**
+ *	write_page - Write one page to given swap location.
+ *	@buf:		Address we're writing.
+ *	@offset:	Offset of the swap page we're writing to.
+ *	@hb:		bio completion batch
+ */
+
+static int write_page(void *buf, sector_t offset, struct hib_bio_batch *hb)
+{
+	void *src;
+	int ret;
+
+	if (!offset)
+		return -ENOSPC;
+
+	if (hb) {
+		src = (void *)__get_free_page(GFP_NOIO | __GFP_NOWARN |
+		                              __GFP_NORETRY);
+		if (src) {
+			copy_page(src, buf);
+		} else {
+			ret = hib_wait_io(hb); /* Free pages */
+			if (ret)
+				return ret;
+			src = (void *)__get_free_page(GFP_NOIO |
+			                              __GFP_NOWARN |
+			                              __GFP_NORETRY);
+			if (src) {
+				copy_page(src, buf);
+			} else {
+				WARN_ON_ONCE(1);
+				hb = NULL;	/* Go synchronous */
+				src = buf;
+			}
+		}
+	} else {
+		src = buf;
+	}
+	return hib_submit_io(REQ_OP_WRITE | REQ_SYNC, offset, src, hb);
+}
+
+static void release_swap_writer(struct swap_map_handle *handle)
+{
+	if (handle->cur)
+		free_page((unsigned long)handle->cur);
+	handle->cur = NULL;
+}
+
+static int get_swap_writer(struct swap_map_handle *handle)
+{
+	int ret;
+
+	ret = swsusp_swap_check();
+	if (ret) {
+		if (ret != -ENOSPC)
+			pr_err("Cannot find swap device, try swapon -a\n");
+		return ret;
+	}
+	handle->cur = (struct swap_map_page *)get_zeroed_page(GFP_KERNEL);
+	if (!handle->cur) {
+		ret = -ENOMEM;
+		goto err_close;
+	}
+	handle->cur_swap = alloc_swapdev_block(root_swap);
+	if (!handle->cur_swap) {
+		ret = -ENOSPC;
+		goto err_rel;
+	}
+	handle->k = 0;
+	handle->reqd_free_pages = reqd_free_pages();
+	handle->first_sector = handle->cur_swap;
+	return 0;
+err_rel:
+	release_swap_writer(handle);
+err_close:
+	swsusp_close();
+	return ret;
+}
+
+static int swap_write_page(struct swap_map_handle *handle, void *buf,
+		struct hib_bio_batch *hb)
+{
+	int error;
+	sector_t offset;
+
+	if (!handle->cur)
+		return -EINVAL;
+	offset = alloc_swapdev_block(root_swap);
+	error = write_page(buf, offset, hb);
+	if (error)
+		return error;
+	handle->cur->entries[handle->k++] = offset;
+	if (handle->k >= MAP_PAGE_ENTRIES) {
+		offset = alloc_swapdev_block(root_swap);
+		if (!offset)
+			return -ENOSPC;
+		handle->cur->next_swap = offset;
+		error = write_page(handle->cur, handle->cur_swap, hb);
+		if (error)
+			goto out;
+		clear_page(handle->cur);
+		handle->cur_swap = offset;
+		handle->k = 0;
+
+		if (hb && low_free_pages() <= handle->reqd_free_pages) {
+			error = hib_wait_io(hb);
+			if (error)
+				goto out;
+			/*
+			 * Recalculate the number of required free pages, to
+			 * make sure we never take more than half.
+			 */
+			handle->reqd_free_pages = reqd_free_pages();
+		}
+	}
+ out:
+	return error;
+}
+
+static int flush_swap_writer(struct swap_map_handle *handle)
+{
+	if (handle->cur && handle->cur_swap)
+		return write_page(handle->cur, handle->cur_swap, NULL);
+	else
+		return -EINVAL;
+}
+
+static int swap_writer_finish(struct swap_map_handle *handle,
+		unsigned int flags, int error)
+{
+	if (!error) {
+		pr_info("S");
+		error = mark_swapfiles(handle, flags);
+		pr_cont("|\n");
+		flush_swap_writer(handle);
+	}
+
+	if (error)
+		free_all_swap_pages(root_swap);
+	release_swap_writer(handle);
+	swsusp_close();
+
+	return error;
+}
+
+/*
+ * Bytes we need for compressed data in worst case. We assume(limitation)
+ * this is the worst of all the compression algorithms.
+ */
+#define bytes_worst_compress(x) ((x) + ((x) / 16) + 64 + 3 + 2)
+
+/* We need to remember how much compressed data we need to read. */
+#define CMP_HEADER	sizeof(size_t)
+
+/* Number of pages/bytes we'll compress at one time. */
+#define UNC_PAGES	32
+#define UNC_SIZE	(UNC_PAGES * PAGE_SIZE)
+
+/* Number of pages we need for compressed data (worst case). */
+#define CMP_PAGES	DIV_ROUND_UP(bytes_worst_compress(UNC_SIZE) + \
+				CMP_HEADER, PAGE_SIZE)
+#define CMP_SIZE	(CMP_PAGES * PAGE_SIZE)
+
+/* Maximum number of threads for compression/decompression. */
+#define CMP_THREADS	3
+
+/* Minimum/maximum number of pages for read buffering. */
+#define CMP_MIN_RD_PAGES	1024
+#define CMP_MAX_RD_PAGES	8192
+
+/**
+ *	save_image - save the suspend image data
+ */
+
+static int save_image(struct swap_map_handle *handle,
+                      struct snapshot_handle *snapshot,
+                      unsigned int nr_to_write)
+{
+	unsigned int m;
+	int ret;
+	int nr_pages;
+	int err2;
+	struct hib_bio_batch hb;
+	ktime_t start;
+	ktime_t stop;
+
+	hib_init_batch(&hb);
+
+	pr_info("Saving image data pages (%u pages)...\n",
+		nr_to_write);
+	m = nr_to_write / 10;
+	if (!m)
+		m = 1;
+	nr_pages = 0;
+	start = ktime_get();
+	while (1) {
+		ret = snapshot_read_next(snapshot);
+		if (ret <= 0)
+			break;
+		ret = swap_write_page(handle, data_of(*snapshot), &hb);
+		if (ret)
+			break;
+		if (!(nr_pages % m))
+			pr_info("Image saving progress: %3d%%\n",
+				nr_pages / m * 10);
+		nr_pages++;
+	}
+	err2 = hib_wait_io(&hb);
+	hib_finish_batch(&hb);
+	stop = ktime_get();
+	if (!ret)
+		ret = err2;
+	if (!ret)
+		pr_info("Image saving done\n");
+	swsusp_show_speed(start, stop, nr_to_write, "Wrote");
+	return ret;
+}
+
+/*
+ * Structure used for CRC32.
+ */
+struct crc_data {
+	struct task_struct *thr;                  /* thread */
+	atomic_t ready;                           /* ready to start flag */
+	atomic_t stop;                            /* ready to stop flag */
+	unsigned run_threads;                     /* nr current threads */
+	wait_queue_head_t go;                     /* start crc update */
+	wait_queue_head_t done;                   /* crc update done */
+	u32 *crc32;                               /* points to handle's crc32 */
+	size_t *unc_len[CMP_THREADS];             /* uncompressed lengths */
+	unsigned char *unc[CMP_THREADS];          /* uncompressed data */
+};
+
+/*
+ * CRC32 update function that runs in its own thread.
+ */
+static int crc32_threadfn(void *data)
+{
+	struct crc_data *d = data;
+	unsigned i;
+
+	while (1) {
+		wait_event(d->go, atomic_read_acquire(&d->ready) ||
+		                  kthread_should_stop());
+		if (kthread_should_stop()) {
+			d->thr = NULL;
+			atomic_set_release(&d->stop, 1);
+			wake_up(&d->done);
+			break;
+		}
+		atomic_set(&d->ready, 0);
+
+		for (i = 0; i < d->run_threads; i++)
+			*d->crc32 = crc32_le(*d->crc32,
+			                     d->unc[i], *d->unc_len[i]);
+		atomic_set_release(&d->stop, 1);
+		wake_up(&d->done);
+	}
+	return 0;
+}
+/*
+ * Structure used for data compression.
+ */
+struct cmp_data {
+	struct task_struct *thr;                  /* thread */
+	struct crypto_comp *cc;                   /* crypto compressor stream */
+	atomic_t ready;                           /* ready to start flag */
+	atomic_t stop;                            /* ready to stop flag */
+	int ret;                                  /* return code */
+	wait_queue_head_t go;                     /* start compression */
+	wait_queue_head_t done;                   /* compression done */
+	size_t unc_len;                           /* uncompressed length */
+	size_t cmp_len;                           /* compressed length */
+	unsigned char unc[UNC_SIZE];              /* uncompressed buffer */
+	unsigned char cmp[CMP_SIZE];              /* compressed buffer */
+};
+
+/* Indicates the image size after compression */
+static atomic_t compressed_size = ATOMIC_INIT(0);
+
+/*
+ * Compression function that runs in its own thread.
+ */
+static int compress_threadfn(void *data)
+{
+	struct cmp_data *d = data;
+	unsigned int cmp_len = 0;
+
+	while (1) {
+		wait_event(d->go, atomic_read_acquire(&d->ready) ||
+		                  kthread_should_stop());
+		if (kthread_should_stop()) {
+			d->thr = NULL;
+			d->ret = -1;
+			atomic_set_release(&d->stop, 1);
+			wake_up(&d->done);
+			break;
+		}
+		atomic_set(&d->ready, 0);
+
+		cmp_len = CMP_SIZE - CMP_HEADER;
+		d->ret = crypto_comp_compress(d->cc, d->unc, d->unc_len,
+					      d->cmp + CMP_HEADER,
+					      &cmp_len);
+		d->cmp_len = cmp_len;
+
+		atomic_set(&compressed_size, atomic_read(&compressed_size) + d->cmp_len);
+		atomic_set_release(&d->stop, 1);
+		wake_up(&d->done);
+	}
+	return 0;
+}
+
+/**
+ * save_compressed_image - Save the suspend image data after compression.
+ * @handle: Swap map handle to use for saving the image.
+ * @snapshot: Image to read data from.
+ * @nr_to_write: Number of pages to save.
+ */
+static int save_compressed_image(struct swap_map_handle *handle,
+				 struct snapshot_handle *snapshot,
+				 unsigned int nr_to_write)
+{
+	unsigned int m;
+	int ret = 0;
+	int nr_pages;
+	int err2;
+	struct hib_bio_batch hb;
+	ktime_t start;
+	ktime_t stop;
+	size_t off;
+	unsigned thr, run_threads, nr_threads;
+	unsigned char *page = NULL;
+	struct cmp_data *data = NULL;
+	struct crc_data *crc = NULL;
+
+	hib_init_batch(&hb);
+
+	atomic_set(&compressed_size, 0);
+
+	/*
+	 * We'll limit the number of threads for compression to limit memory
+	 * footprint.
+	 */
+	nr_threads = num_online_cpus() - 1;
+	nr_threads = clamp_val(nr_threads, 1, CMP_THREADS);
+
+	page = (void *)__get_free_page(GFP_NOIO | __GFP_HIGH);
+	if (!page) {
+		pr_err("Failed to allocate %s page\n", hib_comp_algo);
+		ret = -ENOMEM;
+		goto out_clean;
+	}
+
+	data = vzalloc(array_size(nr_threads, sizeof(*data)));
+	if (!data) {
+		pr_err("Failed to allocate %s data\n", hib_comp_algo);
+		ret = -ENOMEM;
+		goto out_clean;
+	}
+
+	crc = kzalloc(sizeof(*crc), GFP_KERNEL);
+	if (!crc) {
+		pr_err("Failed to allocate crc\n");
+		ret = -ENOMEM;
+		goto out_clean;
+	}
+
+	/*
+	 * Start the compression threads.
+	 */
+	for (thr = 0; thr < nr_threads; thr++) {
+		init_waitqueue_head(&data[thr].go);
+		init_waitqueue_head(&data[thr].done);
+
+		data[thr].cc = crypto_alloc_comp(hib_comp_algo, 0, 0);
+		if (IS_ERR_OR_NULL(data[thr].cc)) {
+			pr_err("Could not allocate comp stream %ld\n", PTR_ERR(data[thr].cc));
+			ret = -EFAULT;
+			goto out_clean;
+		}
+
+		data[thr].thr = kthread_run(compress_threadfn,
+		                            &data[thr],
+		                            "image_compress/%u", thr);
+		if (IS_ERR(data[thr].thr)) {
+			data[thr].thr = NULL;
+			pr_err("Cannot start compression threads\n");
+			ret = -ENOMEM;
+			goto out_clean;
+		}
+	}
+
+	/*
+	 * Start the CRC32 thread.
+	 */
+	init_waitqueue_head(&crc->go);
+	init_waitqueue_head(&crc->done);
+
+	handle->crc32 = 0;
+	crc->crc32 = &handle->crc32;
+	for (thr = 0; thr < nr_threads; thr++) {
+		crc->unc[thr] = data[thr].unc;
+		crc->unc_len[thr] = &data[thr].unc_len;
+	}
+
+	crc->thr = kthread_run(crc32_threadfn, crc, "image_crc32");
+	if (IS_ERR(crc->thr)) {
+		crc->thr = NULL;
+		pr_err("Cannot start CRC32 thread\n");
+		ret = -ENOMEM;
+		goto out_clean;
+	}
+
+	/*
+	 * Adjust the number of required free pages after all allocations have
+	 * been done. We don't want to run out of pages when writing.
+	 */
+	handle->reqd_free_pages = reqd_free_pages();
+
+	pr_info("Using %u thread(s) for %s compression\n", nr_threads, hib_comp_algo);
+	pr_info("Compressing and saving image data (%u pages)...\n",
+		nr_to_write);
+	m = nr_to_write / 10;
+	if (!m)
+		m = 1;
+	nr_pages = 0;
+	start = ktime_get();
+	for (;;) {
+		for (thr = 0; thr < nr_threads; thr++) {
+			for (off = 0; off < UNC_SIZE; off += PAGE_SIZE) {
+				ret = snapshot_read_next(snapshot);
+				if (ret < 0)
+					goto out_finish;
+
+				if (!ret)
+					break;
+
+				memcpy(data[thr].unc + off,
+				       data_of(*snapshot), PAGE_SIZE);
+
+				if (!(nr_pages % m))
+					pr_info("Image saving progress: %3d%%\n",
+						nr_pages / m * 10);
+				nr_pages++;
+			}
+			if (!off)
+				break;
+
+			data[thr].unc_len = off;
+
+			atomic_set_release(&data[thr].ready, 1);
+			wake_up(&data[thr].go);
+		}
+
+		if (!thr)
+			break;
+
+		crc->run_threads = thr;
+		atomic_set_release(&crc->ready, 1);
+		wake_up(&crc->go);
+
+		for (run_threads = thr, thr = 0; thr < run_threads; thr++) {
+			wait_event(data[thr].done,
+				atomic_read_acquire(&data[thr].stop));
+			atomic_set(&data[thr].stop, 0);
+
+			ret = data[thr].ret;
+
+			if (ret < 0) {
+				pr_err("%s compression failed\n", hib_comp_algo);
+				goto out_finish;
+			}
+
+			if (unlikely(!data[thr].cmp_len ||
+			             data[thr].cmp_len >
+				     bytes_worst_compress(data[thr].unc_len))) {
+				pr_err("Invalid %s compressed length\n", hib_comp_algo);
+				ret = -1;
+				goto out_finish;
+			}
+
+			*(size_t *)data[thr].cmp = data[thr].cmp_len;
+
+			/*
+			 * Given we are writing one page at a time to disk, we
+			 * copy that much from the buffer, although the last
+			 * bit will likely be smaller than full page. This is
+			 * OK - we saved the length of the compressed data, so
+			 * any garbage at the end will be discarded when we
+			 * read it.
+			 */
+			for (off = 0;
+			     off < CMP_HEADER + data[thr].cmp_len;
+			     off += PAGE_SIZE) {
+				memcpy(page, data[thr].cmp + off, PAGE_SIZE);
+
+				ret = swap_write_page(handle, page, &hb);
+				if (ret)
+					goto out_finish;
+			}
+		}
+
+		wait_event(crc->done, atomic_read_acquire(&crc->stop));
+		atomic_set(&crc->stop, 0);
+	}
+
+out_finish:
+	err2 = hib_wait_io(&hb);
+	stop = ktime_get();
+	if (!ret)
+		ret = err2;
+	if (!ret)
+		pr_info("Image saving done\n");
+	swsusp_show_speed(start, stop, nr_to_write, "Wrote");
+	pr_info("Image size after compression: %d kbytes\n",
+		(atomic_read(&compressed_size) / 1024));
+
+out_clean:
+	hib_finish_batch(&hb);
+	if (crc) {
+		if (crc->thr)
+			kthread_stop(crc->thr);
+		kfree(crc);
+	}
+	if (data) {
+		for (thr = 0; thr < nr_threads; thr++) {
+			if (data[thr].thr)
+				kthread_stop(data[thr].thr);
+			if (data[thr].cc)
+				crypto_free_comp(data[thr].cc);
+		}
+		vfree(data);
+	}
+	if (page) free_page((unsigned long)page);
+
+	return ret;
+}
+
+/**
+ *	enough_swap - Make sure we have enough swap to save the image.
+ *
+ *	Returns TRUE or FALSE after checking the total amount of swap
+ *	space available from the resume partition.
+ */
+
+static int enough_swap(unsigned int nr_pages)
+{
+	unsigned int free_swap = count_swap_pages(root_swap, 1);
+	unsigned int required;
+
+	pr_debug("Free swap pages: %u\n", free_swap);
+
+	required = PAGES_FOR_IO + nr_pages;
+	return free_swap > required;
+}
+
+/**
+ *	swsusp_write - Write entire image and metadata.
+ *	@flags: flags to pass to the "boot" kernel in the image header
+ *
+ *	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.)
+ */
+
+int swsusp_write(unsigned int flags)
+{
+	struct swap_map_handle handle;
+	struct snapshot_handle snapshot;
+	struct swsusp_info *header;
+	unsigned long pages;
+	int error;
+
+	pages = snapshot_get_image_size();
+	error = get_swap_writer(&handle);
+	if (error) {
+		pr_err("Cannot get swap writer\n");
+		return error;
+	}
+	if (flags & SF_NOCOMPRESS_MODE) {
+		if (!enough_swap(pages)) {
+			pr_err("Not enough free swap\n");
+			error = -ENOSPC;
+			goto out_finish;
+		}
+	}
+	memset(&snapshot, 0, sizeof(struct snapshot_handle));
+	error = snapshot_read_next(&snapshot);
+	if (error < (int)PAGE_SIZE) {
+		if (error >= 0)
+			error = -EFAULT;
+
+		goto out_finish;
+	}
+	header = (struct swsusp_info *)data_of(snapshot);
+	error = swap_write_page(&handle, header, NULL);
+	if (!error) {
+		error = (flags & SF_NOCOMPRESS_MODE) ?
+			save_image(&handle, &snapshot, pages - 1) :
+			save_compressed_image(&handle, &snapshot, pages - 1);
+	}
+out_finish:
+	error = swap_writer_finish(&handle, flags, error);
+	return error;
+}
+
+/*
+ *	The following functions allow us to read data using a swap map
+ *	in a file-like way.
+ */
+
+static void release_swap_reader(struct swap_map_handle *handle)
+{
+	struct swap_map_page_list *tmp;
+
+	while (handle->maps) {
+		if (handle->maps->map)
+			free_page((unsigned long)handle->maps->map);
+		tmp = handle->maps;
+		handle->maps = handle->maps->next;
+		kfree(tmp);
+	}
+	handle->cur = NULL;
+}
+
+static int get_swap_reader(struct swap_map_handle *handle,
+		unsigned int *flags_p)
+{
+	int error;
+	struct swap_map_page_list *tmp, *last;
+	sector_t offset;
+
+	*flags_p = swsusp_header->flags;
+
+	if (!swsusp_header->image) /* how can this happen? */
+		return -EINVAL;
+
+	handle->cur = NULL;
+	last = handle->maps = NULL;
+	offset = swsusp_header->image;
+	while (offset) {
+		tmp = kzalloc(sizeof(*handle->maps), GFP_KERNEL);
+		if (!tmp) {
+			release_swap_reader(handle);
+			return -ENOMEM;
+		}
+		if (!handle->maps)
+			handle->maps = tmp;
+		if (last)
+			last->next = tmp;
+		last = tmp;
+
+		tmp->map = (struct swap_map_page *)
+			   __get_free_page(GFP_NOIO | __GFP_HIGH);
+		if (!tmp->map) {
+			release_swap_reader(handle);
+			return -ENOMEM;
+		}
+
+		error = hib_submit_io(REQ_OP_READ, offset, tmp->map, NULL);
+		if (error) {
+			release_swap_reader(handle);
+			return error;
+		}
+		offset = tmp->map->next_swap;
+	}
+	handle->k = 0;
+	handle->cur = handle->maps->map;
+	return 0;
+}
+
+static int swap_read_page(struct swap_map_handle *handle, void *buf,
+		struct hib_bio_batch *hb)
+{
+	sector_t offset;
+	int error;
+	struct swap_map_page_list *tmp;
+
+	if (!handle->cur)
+		return -EINVAL;
+	offset = handle->cur->entries[handle->k];
+	if (!offset)
+		return -EFAULT;
+	error = hib_submit_io(REQ_OP_READ, offset, buf, hb);
+	if (error)
+		return error;
+	if (++handle->k >= MAP_PAGE_ENTRIES) {
+		handle->k = 0;
+		free_page((unsigned long)handle->maps->map);
+		tmp = handle->maps;
+		handle->maps = handle->maps->next;
+		kfree(tmp);
+		if (!handle->maps)
+			release_swap_reader(handle);
+		else
+			handle->cur = handle->maps->map;
+	}
+	return error;
+}
+
+static int swap_reader_finish(struct swap_map_handle *handle)
+{
+	release_swap_reader(handle);
+
+	return 0;
+}
+
+struct swsusp_readpages {
+	unsigned long size;
+	unsigned long cursor;
+	struct page **pages;
+};
+
+static int swsusp_init_readpages(struct swsusp_readpages *read_pages, unsigned int nr_to_read)
+{
+	read_pages->pages = (struct page **)vzalloc(sizeof(struct page *) * nr_to_read);
+	if (!read_pages->pages) {
+		return -ENOMEM;
+	}
+
+	read_pages->size = nr_to_read;
+	read_pages->cursor = 0;
+
+	return 0;
+}
+
+
+static int swsusp_add_readpage(struct swsusp_readpages *read_pages, void *page_addr)
+{
+	if (read_pages->cursor >= read_pages->size) {
+		return -ENOMEM;
+	}
+
+	read_pages->pages[read_pages->cursor++] = virt_to_page(page_addr);
+	return 0;
+}
+
+static void swsusp_clean_readedpages(struct swsusp_readpages *read_pages, bool flush)
+{
+	unsigned long idx;
+
+	for (idx = 0; idx < read_pages->cursor; idx++) {
+		if (flush && read_pages->pages[idx])
+			flush_icache_range((unsigned long)page_address(read_pages->pages[idx]),
+								(unsigned long)page_address(read_pages->pages[idx] + PAGE_SIZE));
+	}
+
+	vfree(read_pages->pages);
+	return;
+}
+
+/**
+ *	load_image - load the image using the swap map handle
+ *	@handle and the snapshot handle @snapshot
+ *	(assume there are @nr_pages pages to load)
+ */
+
+static int load_image(struct swap_map_handle *handle,
+                      struct snapshot_handle *snapshot,
+                      unsigned int nr_to_read)
+{
+	unsigned int m;
+	int ret = 0;
+	ktime_t start;
+	ktime_t stop;
+	struct hib_bio_batch hb;
+	int err2;
+	unsigned nr_pages;
+	struct swsusp_readpages pages_to_clean;
+
+	hib_init_batch(&hb);
+	ret = swsusp_init_readpages(&pages_to_clean, nr_to_read);
+	if (!ret) {
+		return ret;
+	}
+
+	pr_info("Loading image data pages (%u pages)...\n", nr_to_read);
+	m = nr_to_read / 10;
+	if (!m)
+		m = 1;
+	nr_pages = 0;
+	start = ktime_get();
+	for ( ; ; ) {
+		ret = snapshot_write_next(snapshot);
+		if (ret <= 0)
+			break;
+		ret = swap_read_page(handle, data_of(*snapshot), &hb);
+		if (ret)
+			break;
+		if (snapshot->sync_read)
+			ret = hib_wait_io(&hb);
+		if (ret)
+			break;
+		ret = swsusp_add_readpage(&pages_to_clean, data_of(*snapshot));
+		if (ret)
+			break;
+
+		if (!(nr_pages % m))
+			pr_info("Image loading progress: %3d%%\n",
+				nr_pages / m * 10);
+		nr_pages++;
+	}
+	err2 = hib_wait_io(&hb);
+	hib_finish_batch(&hb);
+	stop = ktime_get();
+	if (!ret)
+		ret = err2;
+	swsusp_clean_readedpages(&pages_to_clean, !ret);
+	if (!ret) {
+		pr_info("Image loading done\n");
+		ret = snapshot_write_finalize(snapshot);
+		if (!ret && !snapshot_image_loaded(snapshot))
+			ret = -ENODATA;
+	}
+	swsusp_show_speed(start, stop, nr_to_read, "Read");
+	return ret;
+}
+
+/*
+ * Structure used for data decompression.
+ */
+struct dec_data {
+	struct task_struct *thr;                  /* thread */
+	struct crypto_comp *cc;                   /* crypto compressor stream */
+	atomic_t ready;                           /* ready to start flag */
+	atomic_t stop;                            /* ready to stop flag */
+	int ret;                                  /* return code */
+	wait_queue_head_t go;                     /* start decompression */
+	wait_queue_head_t done;                   /* decompression done */
+	size_t unc_len;                           /* uncompressed length */
+	size_t cmp_len;                           /* compressed length */
+	unsigned char unc[UNC_SIZE];              /* uncompressed buffer */
+	unsigned char cmp[CMP_SIZE];              /* compressed buffer */
+};
+
+/*
+ * Decompression function that runs in its own thread.
+ */
+static int decompress_threadfn(void *data)
+{
+	struct dec_data *d = data;
+	unsigned int unc_len = 0;
+
+	while (1) {
+		wait_event(d->go, atomic_read_acquire(&d->ready) ||
+		                  kthread_should_stop());
+		if (kthread_should_stop()) {
+			d->thr = NULL;
+			d->ret = -1;
+			atomic_set_release(&d->stop, 1);
+			wake_up(&d->done);
+			break;
+		}
+		atomic_set(&d->ready, 0);
+
+		unc_len = UNC_SIZE;
+		d->ret = crypto_comp_decompress(d->cc, d->cmp + CMP_HEADER, d->cmp_len,
+						d->unc, &unc_len);
+		d->unc_len = unc_len;
+
+		if (clean_pages_on_decompress)
+			flush_icache_range((unsigned long)d->unc,
+					   (unsigned long)d->unc + d->unc_len);
+
+		atomic_set_release(&d->stop, 1);
+		wake_up(&d->done);
+	}
+	return 0;
+}
+
+/**
+ * load_compressed_image - Load compressed image data and decompress it.
+ * @handle: Swap map handle to use for loading data.
+ * @snapshot: Image to copy uncompressed data into.
+ * @nr_to_read: Number of pages to load.
+ */
+static int load_compressed_image(struct swap_map_handle *handle,
+				 struct snapshot_handle *snapshot,
+				 unsigned int nr_to_read)
+{
+	unsigned int m;
+	int ret = 0;
+	int eof = 0;
+	struct hib_bio_batch hb;
+	ktime_t start;
+	ktime_t stop;
+	unsigned nr_pages;
+	size_t off;
+	unsigned i, thr, run_threads, nr_threads;
+	unsigned ring = 0, pg = 0, ring_size = 0,
+	         have = 0, want, need, asked = 0;
+	unsigned long read_pages = 0;
+	unsigned char **page = NULL;
+	struct dec_data *data = NULL;
+	struct crc_data *crc = NULL;
+
+	hib_init_batch(&hb);
+
+	/*
+	 * We'll limit the number of threads for decompression to limit memory
+	 * footprint.
+	 */
+	nr_threads = num_online_cpus() - 1;
+	nr_threads = clamp_val(nr_threads, 1, CMP_THREADS);
+
+	page = vmalloc(array_size(CMP_MAX_RD_PAGES, sizeof(*page)));
+	if (!page) {
+		pr_err("Failed to allocate %s page\n", hib_comp_algo);
+		ret = -ENOMEM;
+		goto out_clean;
+	}
+
+	data = vzalloc(array_size(nr_threads, sizeof(*data)));
+	if (!data) {
+		pr_err("Failed to allocate %s data\n", hib_comp_algo);
+		ret = -ENOMEM;
+		goto out_clean;
+	}
+
+	crc = kzalloc(sizeof(*crc), GFP_KERNEL);
+	if (!crc) {
+		pr_err("Failed to allocate crc\n");
+		ret = -ENOMEM;
+		goto out_clean;
+	}
+
+	clean_pages_on_decompress = true;
+
+	/*
+	 * Start the decompression threads.
+	 */
+	for (thr = 0; thr < nr_threads; thr++) {
+		init_waitqueue_head(&data[thr].go);
+		init_waitqueue_head(&data[thr].done);
+
+		data[thr].cc = crypto_alloc_comp(hib_comp_algo, 0, 0);
+		if (IS_ERR_OR_NULL(data[thr].cc)) {
+			pr_err("Could not allocate comp stream %ld\n", PTR_ERR(data[thr].cc));
+			ret = -EFAULT;
+			goto out_clean;
+		}
+
+		data[thr].thr = kthread_run(decompress_threadfn,
+		                            &data[thr],
+		                            "image_decompress/%u", thr);
+		if (IS_ERR(data[thr].thr)) {
+			data[thr].thr = NULL;
+			pr_err("Cannot start decompression threads\n");
+			ret = -ENOMEM;
+			goto out_clean;
+		}
+	}
+
+	/*
+	 * Start the CRC32 thread.
+	 */
+	init_waitqueue_head(&crc->go);
+	init_waitqueue_head(&crc->done);
+
+	handle->crc32 = 0;
+	crc->crc32 = &handle->crc32;
+	for (thr = 0; thr < nr_threads; thr++) {
+		crc->unc[thr] = data[thr].unc;
+		crc->unc_len[thr] = &data[thr].unc_len;
+	}
+
+	crc->thr = kthread_run(crc32_threadfn, crc, "image_crc32");
+	if (IS_ERR(crc->thr)) {
+		crc->thr = NULL;
+		pr_err("Cannot start CRC32 thread\n");
+		ret = -ENOMEM;
+		goto out_clean;
+	}
+
+	/*
+	 * Set the number of pages for read buffering.
+	 * This is complete guesswork, because we'll only know the real
+	 * picture once prepare_image() is called, which is much later on
+	 * during the image load phase. We'll assume the worst case and
+	 * say that none of the image pages are from high memory.
+	 */
+	if (low_free_pages() > snapshot_get_image_size())
+		read_pages = (low_free_pages() - snapshot_get_image_size()) / 2;
+	read_pages = clamp_val(read_pages, CMP_MIN_RD_PAGES, CMP_MAX_RD_PAGES);
+
+	for (i = 0; i < read_pages; i++) {
+		page[i] = (void *)__get_free_page(i < CMP_PAGES ?
+						  GFP_NOIO | __GFP_HIGH :
+						  GFP_NOIO | __GFP_NOWARN |
+						  __GFP_NORETRY);
+
+		if (!page[i]) {
+			if (i < CMP_PAGES) {
+				ring_size = i;
+				pr_err("Failed to allocate %s pages\n", hib_comp_algo);
+				ret = -ENOMEM;
+				goto out_clean;
+			} else {
+				break;
+			}
+		}
+	}
+	want = ring_size = i;
+
+	pr_info("Using %u thread(s) for %s decompression\n", nr_threads, hib_comp_algo);
+	pr_info("Loading and decompressing image data (%u pages)...\n",
+		nr_to_read);
+	m = nr_to_read / 10;
+	if (!m)
+		m = 1;
+	nr_pages = 0;
+	start = ktime_get();
+
+	ret = snapshot_write_next(snapshot);
+	if (ret <= 0)
+		goto out_finish;
+
+	for(;;) {
+		for (i = 0; !eof && i < want; i++) {
+			ret = swap_read_page(handle, page[ring], &hb);
+			if (ret) {
+				/*
+				 * On real read error, finish. On end of data,
+				 * set EOF flag and just exit the read loop.
+				 */
+				if (handle->cur &&
+				    handle->cur->entries[handle->k]) {
+					goto out_finish;
+				} else {
+					eof = 1;
+					break;
+				}
+			}
+			if (++ring >= ring_size)
+				ring = 0;
+		}
+		asked += i;
+		want -= i;
+
+		/*
+		 * We are out of data, wait for some more.
+		 */
+		if (!have) {
+			if (!asked)
+				break;
+
+			ret = hib_wait_io(&hb);
+			if (ret)
+				goto out_finish;
+			have += asked;
+			asked = 0;
+			if (eof)
+				eof = 2;
+		}
+
+		if (crc->run_threads) {
+			wait_event(crc->done, atomic_read_acquire(&crc->stop));
+			atomic_set(&crc->stop, 0);
+			crc->run_threads = 0;
+		}
+
+		for (thr = 0; have && thr < nr_threads; thr++) {
+			data[thr].cmp_len = *(size_t *)page[pg];
+			if (unlikely(!data[thr].cmp_len ||
+			             data[thr].cmp_len >
+					bytes_worst_compress(UNC_SIZE))) {
+				pr_err("Invalid %s compressed length\n", hib_comp_algo);
+				ret = -1;
+				goto out_finish;
+			}
+
+			need = DIV_ROUND_UP(data[thr].cmp_len + CMP_HEADER,
+			                    PAGE_SIZE);
+			if (need > have) {
+				if (eof > 1) {
+					ret = -1;
+					goto out_finish;
+				}
+				break;
+			}
+
+			for (off = 0;
+			     off < CMP_HEADER + data[thr].cmp_len;
+			     off += PAGE_SIZE) {
+				memcpy(data[thr].cmp + off,
+				       page[pg], PAGE_SIZE);
+				have--;
+				want++;
+				if (++pg >= ring_size)
+					pg = 0;
+			}
+
+			atomic_set_release(&data[thr].ready, 1);
+			wake_up(&data[thr].go);
+		}
+
+		/*
+		 * Wait for more data while we are decompressing.
+		 */
+		if (have < CMP_PAGES && asked) {
+			ret = hib_wait_io(&hb);
+			if (ret)
+				goto out_finish;
+			have += asked;
+			asked = 0;
+			if (eof)
+				eof = 2;
+		}
+
+		for (run_threads = thr, thr = 0; thr < run_threads; thr++) {
+			wait_event(data[thr].done,
+				atomic_read_acquire(&data[thr].stop));
+			atomic_set(&data[thr].stop, 0);
+
+			ret = data[thr].ret;
+
+			if (ret < 0) {
+				pr_err("%s decompression failed\n", hib_comp_algo);
+				goto out_finish;
+			}
+
+			if (unlikely(!data[thr].unc_len ||
+				data[thr].unc_len > UNC_SIZE ||
+				data[thr].unc_len & (PAGE_SIZE - 1))) {
+				pr_err("Invalid %s uncompressed length\n", hib_comp_algo);
+				ret = -1;
+				goto out_finish;
+			}
+
+			for (off = 0;
+			     off < data[thr].unc_len; off += PAGE_SIZE) {
+				memcpy(data_of(*snapshot),
+				       data[thr].unc + off, PAGE_SIZE);
+
+				if (!(nr_pages % m))
+					pr_info("Image loading progress: %3d%%\n",
+						nr_pages / m * 10);
+				nr_pages++;
+
+				ret = snapshot_write_next(snapshot);
+				if (ret <= 0) {
+					crc->run_threads = thr + 1;
+					atomic_set_release(&crc->ready, 1);
+					wake_up(&crc->go);
+					goto out_finish;
+				}
+			}
+		}
+
+		crc->run_threads = thr;
+		atomic_set_release(&crc->ready, 1);
+		wake_up(&crc->go);
+	}
+
+out_finish:
+	if (crc->run_threads) {
+		wait_event(crc->done, atomic_read_acquire(&crc->stop));
+		atomic_set(&crc->stop, 0);
+	}
+	stop = ktime_get();
+	if (!ret) {
+		pr_info("Image loading done\n");
+		ret = snapshot_write_finalize(snapshot);
+		if (!ret && !snapshot_image_loaded(snapshot))
+			ret = -ENODATA;
+		if (!ret) {
+			if (swsusp_header->flags & SF_CRC32_MODE) {
+				if(handle->crc32 != swsusp_header->crc32) {
+					pr_err("Invalid image CRC32!\n");
+					ret = -ENODATA;
+				}
+			}
+		}
+	}
+	swsusp_show_speed(start, stop, nr_to_read, "Read");
+out_clean:
+	hib_finish_batch(&hb);
+	for (i = 0; i < ring_size; i++)
+		free_page((unsigned long)page[i]);
+	if (crc) {
+		if (crc->thr)
+			kthread_stop(crc->thr);
+		kfree(crc);
+	}
+	if (data) {
+		for (thr = 0; thr < nr_threads; thr++) {
+			if (data[thr].thr)
+				kthread_stop(data[thr].thr);
+			if (data[thr].cc)
+				crypto_free_comp(data[thr].cc);
+		}
+		vfree(data);
+	}
+	vfree(page);
+
+	return ret;
+}
+
+/**
+ *	swsusp_read - read the hibernation image.
+ *	@flags_p: flags passed by the "frozen" kernel in the image header should
+ *		  be written into this memory location
+ */
+
+int swsusp_read(unsigned int *flags_p)
+{
+	int error;
+	struct swap_map_handle handle;
+	struct snapshot_handle snapshot;
+	struct swsusp_info *header;
+
+	memset(&snapshot, 0, sizeof(struct snapshot_handle));
+	error = snapshot_write_next(&snapshot);
+	if (error < (int)PAGE_SIZE)
+		return error < 0 ? error : -EFAULT;
+	header = (struct swsusp_info *)data_of(snapshot);
+	error = get_swap_reader(&handle, flags_p);
+	if (error)
+		goto end;
+	if (!error)
+		error = swap_read_page(&handle, header, NULL);
+	if (!error) {
+		error = (*flags_p & SF_NOCOMPRESS_MODE) ?
+			load_image(&handle, &snapshot, header->pages - 1) :
+			load_compressed_image(&handle, &snapshot, header->pages - 1);
+	}
+	swap_reader_finish(&handle);
+end:
+	if (!error)
+		pr_debug("Image successfully loaded\n");
+	else
+		pr_debug("Error %d resuming\n", error);
+	return error;
+}
+
+static void *swsusp_holder;
+
+/**
+ * swsusp_check - Open the resume device and check for the swsusp signature.
+ * @exclusive: Open the resume device exclusively.
+ */
+
+int swsusp_check(bool exclusive)
+{
+	void *holder = exclusive ? &swsusp_holder : NULL;
+	int error;
+
+	hib_resume_bdev_file = bdev_file_open_by_dev(swsusp_resume_device,
+				BLK_OPEN_READ, holder, NULL);
+	if (!IS_ERR(hib_resume_bdev_file)) {
+		set_blocksize(file_bdev(hib_resume_bdev_file), PAGE_SIZE);
+		clear_page(swsusp_header);
+		error = hib_submit_io(REQ_OP_READ, swsusp_resume_block,
+					swsusp_header, NULL);
+		if (error)
+			goto put;
+
+		if (!memcmp(HIBERNATE_SIG, swsusp_header->sig, 10)) {
+			memcpy(swsusp_header->sig, swsusp_header->orig_sig, 10);
+			swsusp_header_flags = swsusp_header->flags;
+			/* Reset swap signature now */
+			error = hib_submit_io(REQ_OP_WRITE | REQ_SYNC,
+						swsusp_resume_block,
+						swsusp_header, NULL);
+		} else {
+			error = -EINVAL;
+		}
+		if (!error && swsusp_header->flags & SF_HW_SIG &&
+		    swsusp_header->hw_sig != swsusp_hardware_signature) {
+			pr_info("Suspend image hardware signature mismatch (%08x now %08x); aborting resume.\n",
+				swsusp_header->hw_sig, swsusp_hardware_signature);
+			error = -EINVAL;
+		}
+
+put:
+		if (error)
+			fput(hib_resume_bdev_file);
+		else
+			pr_debug("Image signature found, resuming\n");
+	} else {
+		error = PTR_ERR(hib_resume_bdev_file);
+	}
+
+	if (error)
+		pr_debug("Image not found (code %d)\n", error);
+
+	return error;
+}
+
+/**
+ * swsusp_close - close resume device.
+ */
+
+void swsusp_close(void)
+{
+	if (IS_ERR(hib_resume_bdev_file)) {
+		pr_debug("Image device not initialised\n");
+		return;
+	}
+
+	fput(hib_resume_bdev_file);
+}
+
+/**
+ *      swsusp_unmark - Unmark swsusp signature in the resume device
+ */
+
+#ifdef CONFIG_SUSPEND
+int swsusp_unmark(void)
+{
+	int error;
+
+	hib_submit_io(REQ_OP_READ, swsusp_resume_block,
+			swsusp_header, NULL);
+	if (!memcmp(HIBERNATE_SIG,swsusp_header->sig, 10)) {
+		memcpy(swsusp_header->sig,swsusp_header->orig_sig, 10);
+		error = hib_submit_io(REQ_OP_WRITE | REQ_SYNC,
+					swsusp_resume_block,
+					swsusp_header, NULL);
+	} else {
+		pr_err("Cannot find swsusp signature!\n");
+		error = -ENODEV;
+	}
+
+	/*
+	 * We just returned from suspend, we don't need the image any more.
+	 */
+	free_all_swap_pages(root_swap);
+
+	return error;
+}
+#endif
+
+static int __init swsusp_header_init(void)
+{
+	swsusp_header = (struct swsusp_header*) __get_free_page(GFP_KERNEL);
+	if (!swsusp_header)
+		panic("Could not allocate memory for swsusp_header\n");
+	return 0;
+}
+
+core_initcall(swsusp_header_init);
