Linux-libre 4.5-gnu

1 files changed, 0 insertions, 1932 deletions

diff --git a/kernel/power/tuxonice_io.c b/kernel/power/tuxonice_io.c
deleted file mode 100644
index 3c62c2682..000000000
--- a/kernel/power/tuxonice_io.c
+++ /dev/null
@@ -1,1932 +0,0 @@
-/*
- * kernel/power/tuxonice_io.c
- *
- * Copyright (C) 1998-2001 Gabor Kuti <seasons@fornax.hu>
- * Copyright (C) 1998,2001,2002 Pavel Machek <pavel@suse.cz>
- * Copyright (C) 2002-2003 Florent Chabaud <fchabaud@free.fr>
- * Copyright (C) 2002-2015 Nigel Cunningham (nigel at nigelcunningham com au)
- *
- * This file is released under the GPLv2.
- *
- * It contains high level IO routines for hibernating.
- *
- */
-
-#include <linux/suspend.h>
-#include <linux/version.h>
-#include <linux/utsname.h>
-#include <linux/mount.h>
-#include <linux/highmem.h>
-#include <linux/kthread.h>
-#include <linux/cpu.h>
-#include <linux/fs_struct.h>
-#include <linux/bio.h>
-#include <linux/fs_uuid.h>
-#include <linux/kmod.h>
-#include <asm/tlbflush.h>
-
-#include "tuxonice.h"
-#include "tuxonice_modules.h"
-#include "tuxonice_pageflags.h"
-#include "tuxonice_io.h"
-#include "tuxonice_ui.h"
-#include "tuxonice_storage.h"
-#include "tuxonice_prepare_image.h"
-#include "tuxonice_extent.h"
-#include "tuxonice_sysfs.h"
-#include "tuxonice_builtin.h"
-#include "tuxonice_checksum.h"
-#include "tuxonice_alloc.h"
-char alt_resume_param[256];
-
-/* Version read from image header at resume */
-static int toi_image_header_version;
-
-#define read_if_version(VERS, VAR, DESC, ERR_ACT) do {                                        \
-        if (likely(toi_image_header_version >= VERS))                                \
-                if (toiActiveAllocator->rw_header_chunk(READ, NULL,                \
-                                        (char *) &VAR, sizeof(VAR))) {                \
-                        abort_hibernate(TOI_FAILED_IO, "Failed to read DESC.");        \
-                        ERR_ACT;                                        \
-                }                                                                \
-} while(0)                                                                        \
-
-/* Variables shared between threads and updated under the mutex */
-static int io_write, io_finish_at, io_base, io_barmax, io_pageset, io_result;
-static int io_index, io_nextupdate, io_pc, io_pc_step;
-static DEFINE_MUTEX(io_mutex);
-static DEFINE_PER_CPU(struct page *, last_sought);
-static DEFINE_PER_CPU(struct page *, last_high_page);
-static DEFINE_PER_CPU(char *, checksum_locn);
-static DEFINE_PER_CPU(struct pbe *, last_low_page);
-static atomic_t io_count;
-atomic_t toi_io_workers;
-
-static int using_flusher;
-
-DECLARE_WAIT_QUEUE_HEAD(toi_io_queue_flusher);
-
-int toi_bio_queue_flusher_should_finish;
-
-int toi_max_workers;
-
-static char *image_version_error = "The image header version is newer than " \
-        "this kernel supports.";
-
-struct toi_module_ops *first_filter;
-
-static atomic_t toi_num_other_threads;
-static DECLARE_WAIT_QUEUE_HEAD(toi_worker_wait_queue);
-enum toi_worker_commands {
-        TOI_IO_WORKER_STOP,
-        TOI_IO_WORKER_RUN,
-        TOI_IO_WORKER_EXIT
-};
-static enum toi_worker_commands toi_worker_command;
-
-/**
- * toi_attempt_to_parse_resume_device - determine if we can hibernate
- *
- * Can we hibernate, using the current resume= parameter?
- **/
-int toi_attempt_to_parse_resume_device(int quiet)
-{
-        struct list_head *Allocator;
-        struct toi_module_ops *thisAllocator;
-        int result, returning = 0;
-
-        if (toi_activate_storage(0))
-                return 0;
-
-        toiActiveAllocator = NULL;
-        clear_toi_state(TOI_RESUME_DEVICE_OK);
-        clear_toi_state(TOI_CAN_RESUME);
-        clear_result_state(TOI_ABORTED);
-
-        if (!toiNumAllocators) {
-                if (!quiet)
-                        printk(KERN_INFO "TuxOnIce: No storage allocators have "
-                                "been registered. Hibernating will be "
-                                "disabled.\n");
-                goto cleanup;
-        }
-
-        list_for_each(Allocator, &toiAllocators) {
-                thisAllocator = list_entry(Allocator, struct toi_module_ops,
-                                                                type_list);
-
-                /*
-                 * Not sure why you'd want to disable an allocator, but
-                 * we should honour the flag if we're providing it
-                 */
-                if (!thisAllocator->enabled)
-                        continue;
-
-                result = thisAllocator->parse_sig_location(
-                                resume_file, (toiNumAllocators == 1),
-                                quiet);
-
-                switch (result) {
-                case -EINVAL:
-                        /* For this allocator, but not a valid
-                         * configuration. Error already printed. */
-                        goto cleanup;
-
-                case 0:
-                        /* For this allocator and valid. */
-                        toiActiveAllocator = thisAllocator;
-
-                        set_toi_state(TOI_RESUME_DEVICE_OK);
-                        set_toi_state(TOI_CAN_RESUME);
-                        returning = 1;
-                        goto cleanup;
-                }
-        }
-        if (!quiet)
-                printk(KERN_INFO "TuxOnIce: No matching enabled allocator "
-                                "found. Resuming disabled.\n");
-cleanup:
-        toi_deactivate_storage(0);
-        return returning;
-}
-
-void attempt_to_parse_resume_device2(void)
-{
-        toi_prepare_usm();
-        toi_attempt_to_parse_resume_device(0);
-        toi_cleanup_usm();
-}
-
-void save_restore_alt_param(int replace, int quiet)
-{
-        static char resume_param_save[255];
-        static unsigned long toi_state_save;
-
-        if (replace) {
-                toi_state_save = toi_state;
-                strcpy(resume_param_save, resume_file);
-                strcpy(resume_file, alt_resume_param);
-        } else {
-                strcpy(resume_file, resume_param_save);
-                toi_state = toi_state_save;
-        }
-        toi_attempt_to_parse_resume_device(quiet);
-}
-
-void attempt_to_parse_alt_resume_param(void)
-{
-        int ok = 0;
-
-        /* Temporarily set resume_param to the poweroff value */
-        if (!strlen(alt_resume_param))
-                return;
-
-        printk(KERN_INFO "=== Trying Poweroff Resume2 ===\n");
-        save_restore_alt_param(SAVE, NOQUIET);
-        if (test_toi_state(TOI_CAN_RESUME))
-                ok = 1;
-
-        printk(KERN_INFO "=== Done ===\n");
-        save_restore_alt_param(RESTORE, QUIET);
-
-        /* If not ok, clear the string */
-        if (ok)
-                return;
-
-        printk(KERN_INFO "Can't resume from that location; clearing "
-                        "alt_resume_param.\n");
-        alt_resume_param[0] = '\0';
-}
-
-/**
- * noresume_reset_modules - reset data structures in case of non resuming
- *
- * When we read the start of an image, modules (and especially the
- * active allocator) might need to reset data structures if we
- * decide to remove the image rather than resuming from it.
- **/
-static void noresume_reset_modules(void)
-{
-        struct toi_module_ops *this_filter;
-
-        list_for_each_entry(this_filter, &toi_filters, type_list)
-                if (this_filter->noresume_reset)
-                        this_filter->noresume_reset();
-
-        if (toiActiveAllocator && toiActiveAllocator->noresume_reset)
-                toiActiveAllocator->noresume_reset();
-}
-
-/**
- * fill_toi_header - fill the hibernate header structure
- * @struct toi_header: Header data structure to be filled.
- **/
-static int fill_toi_header(struct toi_header *sh)
-{
-        int i, error;
-
-        error = init_header((struct swsusp_info *) sh);
-        if (error)
-                return error;
-
-        sh->pagedir = pagedir1;
-        sh->pageset_2_size = pagedir2.size;
-        sh->param0 = toi_result;
-        sh->param1 = toi_bkd.toi_action;
-        sh->param2 = toi_bkd.toi_debug_state;
-        sh->param3 = toi_bkd.toi_default_console_level;
-        sh->root_fs = current->fs->root.mnt->mnt_sb->s_dev;
-        for (i = 0; i < 4; i++)
-                sh->io_time[i/2][i%2] = toi_bkd.toi_io_time[i/2][i%2];
-        sh->bkd = boot_kernel_data_buffer;
-        return 0;
-}
-
-/**
- * rw_init_modules - initialize modules
- * @rw:                Whether we are reading of writing an image.
- * @which:        Section of the image being processed.
- *
- * Iterate over modules, preparing the ones that will be used to read or write
- * data.
- **/
-static int rw_init_modules(int rw, int which)
-{
-        struct toi_module_ops *this_module;
-        /* Initialise page transformers */
-        list_for_each_entry(this_module, &toi_filters, type_list) {
-                if (!this_module->enabled)
-                        continue;
-                if (this_module->rw_init && this_module->rw_init(rw, which)) {
-                        abort_hibernate(TOI_FAILED_MODULE_INIT,
-                                "Failed to initialize the %s filter.",
-                                this_module->name);
-                        return 1;
-                }
-        }
-
-        /* Initialise allocator */
-        if (toiActiveAllocator->rw_init(rw, which)) {
-                abort_hibernate(TOI_FAILED_MODULE_INIT,
-                                "Failed to initialise the allocator.");
-                return 1;
-        }
-
-        /* Initialise other modules */
-        list_for_each_entry(this_module, &toi_modules, module_list) {
-                if (!this_module->enabled ||
-                    this_module->type == FILTER_MODULE ||
-                    this_module->type == WRITER_MODULE)
-                        continue;
-                if (this_module->rw_init && this_module->rw_init(rw, which)) {
-                        set_abort_result(TOI_FAILED_MODULE_INIT);
-                        printk(KERN_INFO "Setting aborted flag due to module "
-                                        "init failure.\n");
-                        return 1;
-                }
-        }
-
-        return 0;
-}
-
-/**
- * rw_cleanup_modules - cleanup modules
- * @rw:        Whether we are reading of writing an image.
- *
- * Cleanup components after reading or writing a set of pages.
- * Only the allocator may fail.
- **/
-static int rw_cleanup_modules(int rw)
-{
-        struct toi_module_ops *this_module;
-        int result = 0;
-
-        /* Cleanup other modules */
-        list_for_each_entry(this_module, &toi_modules, module_list) {
-                if (!this_module->enabled ||
-                    this_module->type == FILTER_MODULE ||
-                    this_module->type == WRITER_MODULE)
-                        continue;
-                if (this_module->rw_cleanup)
-                        result |= this_module->rw_cleanup(rw);
-        }
-
-        /* Flush data and cleanup */
-        list_for_each_entry(this_module, &toi_filters, type_list) {
-                if (!this_module->enabled)
-                        continue;
-                if (this_module->rw_cleanup)
-                        result |= this_module->rw_cleanup(rw);
-        }
-
-        result |= toiActiveAllocator->rw_cleanup(rw);
-
-        return result;
-}
-
-static struct page *copy_page_from_orig_page(struct page *orig_page, int is_high)
-{
-        int index, min, max;
-        struct page *high_page = NULL,
-                    **my_last_high_page = raw_cpu_ptr(&last_high_page),
-                    **my_last_sought = raw_cpu_ptr(&last_sought);
-        struct pbe *this, **my_last_low_page = raw_cpu_ptr(&last_low_page);
-        void *compare;
-
-        if (is_high) {
-                if (*my_last_sought && *my_last_high_page &&
-                                *my_last_sought < orig_page)
-                        high_page = *my_last_high_page;
-                else
-                        high_page = (struct page *) restore_highmem_pblist;
-                this = (struct pbe *) kmap(high_page);
-                compare = orig_page;
-        } else {
-                if (*my_last_sought && *my_last_low_page &&
-                                *my_last_sought < orig_page)
-                        this = *my_last_low_page;
-                else
-                        this = restore_pblist;
-                compare = page_address(orig_page);
-        }
-
-        *my_last_sought = orig_page;
-
-        /* Locate page containing pbe */
-        while (this[PBES_PER_PAGE - 1].next &&
-                        this[PBES_PER_PAGE - 1].orig_address < compare) {
-                if (is_high) {
-                        struct page *next_high_page = (struct page *)
-                                this[PBES_PER_PAGE - 1].next;
-                        kunmap(high_page);
-                        this = kmap(next_high_page);
-                        high_page = next_high_page;
-                } else
-                        this = this[PBES_PER_PAGE - 1].next;
-        }
-
-        /* Do a binary search within the page */
-        min = 0;
-        max = PBES_PER_PAGE;
-        index = PBES_PER_PAGE / 2;
-        while (max - min) {
-                if (!this[index].orig_address ||
-                    this[index].orig_address > compare)
-                        max = index;
-                else if (this[index].orig_address == compare) {
-                        if (is_high) {
-                                struct page *page = this[index].address;
-                                *my_last_high_page = high_page;
-                                kunmap(high_page);
-                                return page;
-                        }
-                        *my_last_low_page = this;
-                        return virt_to_page(this[index].address);
-                } else
-                        min = index;
-                index = ((max + min) / 2);
-        };
-
-        if (is_high)
-                kunmap(high_page);
-
-        abort_hibernate(TOI_FAILED_IO, "Failed to get destination page for"
-                " orig page %p. This[min].orig_address=%p.\n", orig_page,
-                this[index].orig_address);
-        return NULL;
-}
-
-/**
- * write_next_page - write the next page in a pageset
- * @data_pfn: The pfn where the next data to write is located.
- * @my_io_index: The index of the page in the pageset.
- * @write_pfn: The pfn number to write in the image (where the data belongs).
- *
- * Get the pfn of the next page to write, map the page if necessary and do the
- * write.
- **/
-static int write_next_page(unsigned long *data_pfn, int *my_io_index,
-                unsigned long *write_pfn)
-{
-        struct page *page;
-        char **my_checksum_locn = raw_cpu_ptr(&checksum_locn);
-        int result = 0, was_present;
-
-        *data_pfn = memory_bm_next_pfn(io_map, 0);
-
-        /* Another thread could have beaten us to it. */
-        if (*data_pfn == BM_END_OF_MAP) {
-                if (atomic_read(&io_count)) {
-                        printk(KERN_INFO "Ran out of pfns but io_count is "
-                                        "still %d.\n", atomic_read(&io_count));
-                        BUG();
-                }
-                mutex_unlock(&io_mutex);
-                return -ENODATA;
-        }
-
-        *my_io_index = io_finish_at - atomic_sub_return(1, &io_count);
-
-        memory_bm_clear_bit(io_map, 0, *data_pfn);
-        page = pfn_to_page(*data_pfn);
-
-        was_present = kernel_page_present(page);
-        if (!was_present)
-                kernel_map_pages(page, 1, 1);
-
-        if (io_pageset == 1)
-                *write_pfn = memory_bm_next_pfn(pageset1_map, 0);
-        else {
-                *write_pfn = *data_pfn;
-                *my_checksum_locn = tuxonice_get_next_checksum();
-        }
-
-        TOI_TRACE_DEBUG(*data_pfn, "_PS%d_write %d", io_pageset, *my_io_index);
-
-        mutex_unlock(&io_mutex);
-
-        if (io_pageset == 2 && tuxonice_calc_checksum(page, *my_checksum_locn))
-                return 1;
-
-        result = first_filter->write_page(*write_pfn, TOI_PAGE, page,
-                        PAGE_SIZE);
-
-        if (!was_present)
-                kernel_map_pages(page, 1, 0);
-
-        return result;
-}
-
-/**
- * read_next_page - read the next page in a pageset
- * @my_io_index: The index of the page in the pageset.
- * @write_pfn: The pfn in which the data belongs.
- *
- * Read a page of the image into our buffer. It can happen (here and in the
- * write routine) that threads don't get run until after other CPUs have done
- * all the work. This was the cause of the long standing issue with
- * occasionally getting -ENODATA errors at the end of reading the image. We
- * therefore need to check there's actually a page to read before trying to
- * retrieve one.
- **/
-
-static int read_next_page(int *my_io_index, unsigned long *write_pfn,
-                struct page *buffer)
-{
-        unsigned int buf_size = PAGE_SIZE;
-        unsigned long left = atomic_read(&io_count);
-
-        if (!left)
-                return -ENODATA;
-
-        /* Start off assuming the page we read isn't resaved */
-        *my_io_index = io_finish_at - atomic_sub_return(1, &io_count);
-
-        mutex_unlock(&io_mutex);
-
-        /*
-         * Are we aborting? If so, don't submit any more I/O as
-         * resetting the resume_attempted flag (from ui.c) will
-         * clear the bdev flags, making this thread oops.
-         */
-        if (unlikely(test_toi_state(TOI_STOP_RESUME))) {
-                atomic_dec(&toi_io_workers);
-                if (!atomic_read(&toi_io_workers)) {
-                        /*
-                         * So we can be sure we'll have memory for
-                         * marking that we haven't resumed.
-                         */
-                        rw_cleanup_modules(READ);
-                        set_toi_state(TOI_IO_STOPPED);
-                }
-                while (1)
-                        schedule();
-        }
-
-        /*
-         * See toi_bio_read_page in tuxonice_bio.c:
-         * read the next page in the image.
-         */
-        return first_filter->read_page(write_pfn, TOI_PAGE, buffer, &buf_size);
-}
-
-static void use_read_page(unsigned long write_pfn, struct page *buffer)
-{
-        struct page *final_page = pfn_to_page(write_pfn),
-                    *copy_page = final_page;
-        char *virt, *buffer_virt;
-        int was_present, cpu = smp_processor_id();
-        unsigned long idx = 0;
-
-        if (io_pageset == 1 && (!pageset1_copy_map ||
-                        !memory_bm_test_bit(pageset1_copy_map, cpu, write_pfn))) {
-                int is_high = PageHighMem(final_page);
-                copy_page = copy_page_from_orig_page(is_high ? (void *) write_pfn : final_page, is_high);
-        }
-
-        if (!memory_bm_test_bit(io_map, cpu, write_pfn)) {
-                int test = !memory_bm_test_bit(io_map, cpu, write_pfn);
-                toi_message(TOI_IO, TOI_VERBOSE, 0, "Discard %ld (%d).", write_pfn, test);
-                mutex_lock(&io_mutex);
-                idx = atomic_add_return(1, &io_count);
-                mutex_unlock(&io_mutex);
-                return;
-        }
-
-        virt = kmap(copy_page);
-        buffer_virt = kmap(buffer);
-        was_present = kernel_page_present(copy_page);
-        if (!was_present)
-                kernel_map_pages(copy_page, 1, 1);
-        memcpy(virt, buffer_virt, PAGE_SIZE);
-        if (!was_present)
-                kernel_map_pages(copy_page, 1, 0);
-        kunmap(copy_page);
-        kunmap(buffer);
-        memory_bm_clear_bit(io_map, cpu, write_pfn);
-        TOI_TRACE_DEBUG(write_pfn, "_PS%d_read", io_pageset);
-}
-
-static unsigned long status_update(int writing, unsigned long done,
-                unsigned long ticks)
-{
-        int cs_index = writing ? 0 : 1;
-        unsigned long ticks_so_far = toi_bkd.toi_io_time[cs_index][1] + ticks;
-        unsigned long msec = jiffies_to_msecs(abs(ticks_so_far));
-        unsigned long pgs_per_s, estimate = 0, pages_left;
-
-        if (msec) {
-                pages_left = io_barmax - done;
-                pgs_per_s = 1000 * done / msec;
-                if (pgs_per_s)
-                        estimate = DIV_ROUND_UP(pages_left, pgs_per_s);
-        }
-
-        if (estimate && ticks > HZ / 2)
-                return toi_update_status(done, io_barmax,
-                        " %d/%d MB (%lu sec left)",
-                        MB(done+1), MB(io_barmax), estimate);
-
-        return toi_update_status(done, io_barmax, " %d/%d MB",
-                MB(done+1), MB(io_barmax));
-}
-
-/**
- * worker_rw_loop - main loop to read/write pages
- *
- * The main I/O loop for reading or writing pages. The io_map bitmap is used to
- * track the pages to read/write.
- * If we are reading, the pages are loaded to their final (mapped) pfn.
- * Data is non zero iff this is a thread started via start_other_threads.
- * In that case, we stay in here until told to quit.
- **/
-static int worker_rw_loop(void *data)
-{
-        unsigned long data_pfn, write_pfn, next_jiffies = jiffies + HZ / 4,
-                      jif_index = 1, start_time = jiffies, thread_num;
-        int result = 0, my_io_index = 0, last_worker;
-        struct page *buffer = toi_alloc_page(28, TOI_ATOMIC_GFP);
-        cpumask_var_t orig_mask;
-
-        if (!alloc_cpumask_var(&orig_mask, GFP_KERNEL)) {
-                printk(KERN_EMERG "Failed to allocate cpumask for TuxOnIce I/O thread %ld.\n", (unsigned long) data);
-                result = -ENOMEM;
-                goto out;
-        }
-
-        cpumask_copy(orig_mask, tsk_cpus_allowed(current));
-
-        current->flags |= PF_NOFREEZE;
-
-top:
-        mutex_lock(&io_mutex);
-        thread_num = atomic_read(&toi_io_workers);
-
-        cpumask_copy(tsk_cpus_allowed(current), orig_mask);
-        schedule();
-
-        atomic_inc(&toi_io_workers);
-
-        while (atomic_read(&io_count) >= atomic_read(&toi_io_workers) &&
-                !(io_write && test_result_state(TOI_ABORTED)) &&
-                toi_worker_command == TOI_IO_WORKER_RUN) {
-                if (!thread_num && jiffies > next_jiffies) {
-                        next_jiffies += HZ / 4;
-                        if (toiActiveAllocator->update_throughput_throttle)
-                                toiActiveAllocator->update_throughput_throttle(
-                                                jif_index);
-                        jif_index++;
-                }
-
-                /*
-                 * What page to use? If reading, don't know yet which page's
-                 * data will be read, so always use the buffer. If writing,
-                 * use the copy (Pageset1) or original page (Pageset2), but
-                 * always write the pfn of the original page.
-                 */
-                if (io_write)
-                        result = write_next_page(&data_pfn, &my_io_index,
-                                        &write_pfn);
-                else /* Reading */
-                        result = read_next_page(&my_io_index, &write_pfn,
-                                        buffer);
-
-                if (result) {
-                        mutex_lock(&io_mutex);
-                        /* Nothing to do? */
-                        if (result == -ENODATA) {
-                                toi_message(TOI_IO, TOI_VERBOSE, 0,
-                                        "Thread %d has no more work.",
-                                        smp_processor_id());
-                                break;
-                        }
-
-                        io_result = result;
-
-                        if (io_write) {
-                                printk(KERN_INFO "Write chunk returned %d.\n",
-                                                result);
-                                abort_hibernate(TOI_FAILED_IO,
-                                        "Failed to write a chunk of the "
-                                        "image.");
-                                break;
-                        }
-
-                        if (io_pageset == 1) {
-                                printk(KERN_ERR "\nBreaking out of I/O loop "
-                                        "because of result code %d.\n", result);
-                                break;
-                        }
-                        panic("Read chunk returned (%d)", result);
-                }
-
-                /*
-                 * Discard reads of resaved pages while reading ps2
-                 * and unwanted pages while rereading ps2 when aborting.
-                 */
-                if (!io_write) {
-                        if (!PageResave(pfn_to_page(write_pfn)))
-                                use_read_page(write_pfn, buffer);
-                        else {
-                                mutex_lock(&io_mutex);
-                                toi_message(TOI_IO, TOI_VERBOSE, 0,
-                                                "Resaved %ld.", write_pfn);
-                                atomic_inc(&io_count);
-                                mutex_unlock(&io_mutex);
-                        }
-                }
-
-                if (!thread_num) {
-                        if(my_io_index + io_base > io_nextupdate)
-                                io_nextupdate = status_update(io_write,
-                                                my_io_index + io_base,
-                                                jiffies - start_time);
-
-                        if (my_io_index > io_pc) {
-                                printk(KERN_CONT "...%d%%", 20 * io_pc_step);
-                                io_pc_step++;
-                                io_pc = io_finish_at * io_pc_step / 5;
-                        }
-                }
-
-                toi_cond_pause(0, NULL);
-
-                /*
-                 * Subtle: If there's less I/O still to be done than threads
-                 * running, quit. This stops us doing I/O beyond the end of
-                 * the image when reading.
-                 *
-                 * Possible race condition. Two threads could do the test at
-                 * the same time; one should exit and one should continue.
-                 * Therefore we take the mutex before comparing and exiting.
-                 */
-
-                mutex_lock(&io_mutex);
-        }
-
-        last_worker = atomic_dec_and_test(&toi_io_workers);
-        toi_message(TOI_IO, TOI_VERBOSE, 0, "%d workers left.", atomic_read(&toi_io_workers));
-        mutex_unlock(&io_mutex);
-
-        if ((unsigned long) data && toi_worker_command != TOI_IO_WORKER_EXIT) {
-                /* Were we the last thread and we're using a flusher thread? */
-                if (last_worker && using_flusher) {
-                        toiActiveAllocator->finish_all_io();
-                }
-                /* First, if we're doing I/O, wait for it to finish */
-                wait_event(toi_worker_wait_queue, toi_worker_command != TOI_IO_WORKER_RUN);
-                /* Then wait to be told what to do next */
-                wait_event(toi_worker_wait_queue, toi_worker_command != TOI_IO_WORKER_STOP);
-                if (toi_worker_command == TOI_IO_WORKER_RUN)
-                        goto top;
-        }
-
-        if (thread_num)
-                atomic_dec(&toi_num_other_threads);
-
-out:
-        toi_message(TOI_IO, TOI_LOW, 0, "Thread %d exiting.", thread_num);
-        toi__free_page(28, buffer);
-        free_cpumask_var(orig_mask);
-
-        return result;
-}
-
-int toi_start_other_threads(void)
-{
-        int cpu;
-        struct task_struct *p;
-        int to_start = (toi_max_workers ? toi_max_workers : num_online_cpus()) - 1;
-  unsigned long num_started = 0;
-
-        if (test_action_state(TOI_NO_MULTITHREADED_IO))
-                return 0;
-
-        toi_worker_command = TOI_IO_WORKER_STOP;
-
-        for_each_online_cpu(cpu) {
-                if (num_started == to_start)
-                        break;
-
-                if (cpu == smp_processor_id())
-                        continue;
-
-                p = kthread_create_on_node(worker_rw_loop, (void *) num_started + 1,
-                                cpu_to_node(cpu), "ktoi_io/%d", cpu);
-                if (IS_ERR(p)) {
-                        printk(KERN_ERR "ktoi_io for %i failed\n", cpu);
-                        continue;
-                }
-                kthread_bind(p, cpu);
-                p->flags |= PF_MEMALLOC;
-                wake_up_process(p);
-                num_started++;
-                atomic_inc(&toi_num_other_threads);
-        }
-
-        toi_message(TOI_IO, TOI_LOW, 0, "Started %d threads.", num_started);
-        return num_started;
-}
-
-void toi_stop_other_threads(void)
-{
-        toi_message(TOI_IO, TOI_LOW, 0, "Stopping other threads.");
-        toi_worker_command = TOI_IO_WORKER_EXIT;
-        wake_up(&toi_worker_wait_queue);
-}
-
-/**
- * do_rw_loop - main highlevel function for reading or writing pages
- *
- * Create the io_map bitmap and call worker_rw_loop to perform I/O operations.
- **/
-static int do_rw_loop(int write, int finish_at, struct memory_bitmap *pageflags,
-                int base, int barmax, int pageset)
-{
-        int index = 0, cpu, result = 0, workers_started;
-        unsigned long pfn, next;
-
-        first_filter = toi_get_next_filter(NULL);
-
-        if (!finish_at)
-                return 0;
-
-        io_write = write;
-        io_finish_at = finish_at;
-        io_base = base;
-        io_barmax = barmax;
-        io_pageset = pageset;
-        io_index = 0;
-        io_pc = io_finish_at / 5;
-        io_pc_step = 1;
-        io_result = 0;
-        io_nextupdate = base + 1;
-        toi_bio_queue_flusher_should_finish = 0;
-
-        for_each_online_cpu(cpu) {
-                per_cpu(last_sought, cpu) = NULL;
-                per_cpu(last_low_page, cpu) = NULL;
-                per_cpu(last_high_page, cpu) = NULL;
-        }
-
-        /* Ensure all bits clear */
-        memory_bm_clear(io_map);
-
-        memory_bm_position_reset(io_map);
-        next = memory_bm_next_pfn(io_map, 0);
-
-        BUG_ON(next != BM_END_OF_MAP);
-
-        /* Set the bits for the pages to write */
-        memory_bm_position_reset(pageflags);
-
-        pfn = memory_bm_next_pfn(pageflags, 0);
-        toi_trace_index++;
-
-        while (pfn != BM_END_OF_MAP && index < finish_at) {
-                TOI_TRACE_DEBUG(pfn, "_io_pageset_%d (%d/%d)", pageset, index + 1, finish_at);
-                memory_bm_set_bit(io_map, 0, pfn);
-                pfn = memory_bm_next_pfn(pageflags, 0);
-                index++;
-        }
-
-        BUG_ON(next != BM_END_OF_MAP || index < finish_at);
-
-        memory_bm_position_reset(io_map);
-        toi_trace_index++;
-
-        atomic_set(&io_count, finish_at);
-
-        memory_bm_position_reset(pageset1_map);
-
-        mutex_lock(&io_mutex);
-
-        clear_toi_state(TOI_IO_STOPPED);
-
-        using_flusher = (atomic_read(&toi_num_other_threads) &&
-                         toiActiveAllocator->io_flusher &&
-                         !test_action_state(TOI_NO_FLUSHER_THREAD));
-
-        workers_started = atomic_read(&toi_num_other_threads);
-
-        memory_bm_position_reset(io_map);
-        memory_bm_position_reset(pageset1_copy_map);
-
-        toi_worker_command = TOI_IO_WORKER_RUN;
-        wake_up(&toi_worker_wait_queue);
-
-        mutex_unlock(&io_mutex);
-
-        if (using_flusher)
-                result = toiActiveAllocator->io_flusher(write);
-        else
-                worker_rw_loop(NULL);
-
-        while (atomic_read(&toi_io_workers))
-                schedule();
-
-        printk(KERN_CONT "\n");
-
-        toi_worker_command = TOI_IO_WORKER_STOP;
-        wake_up(&toi_worker_wait_queue);
-
-        if (unlikely(test_toi_state(TOI_STOP_RESUME))) {
-                if (!atomic_read(&toi_io_workers)) {
-                        rw_cleanup_modules(READ);
-                        set_toi_state(TOI_IO_STOPPED);
-                }
-                while (1)
-                        schedule();
-        }
-        set_toi_state(TOI_IO_STOPPED);
-
-        if (!io_result && !result && !test_result_state(TOI_ABORTED)) {
-                unsigned long next;
-
-                toi_update_status(io_base + io_finish_at, io_barmax,
-                                " %d/%d MB ",
-                                MB(io_base + io_finish_at), MB(io_barmax));
-
-                memory_bm_position_reset(io_map);
-                next = memory_bm_next_pfn(io_map, 0);
-                if  (next != BM_END_OF_MAP) {
-                        printk(KERN_INFO "Finished I/O loop but still work to "
-                                        "do?\nFinish at = %d. io_count = %d.\n",
-                                        finish_at, atomic_read(&io_count));
-                        printk(KERN_INFO "I/O bitmap still records work to do."
-                                        "%ld.\n", next);
-                        BUG();
-                        do {
-                                cpu_relax();
-                        } while (0);
-                }
-        }
-
-        return io_result ? io_result : result;
-}
-
-/**
- * write_pageset - write a pageset to disk.
- * @pagedir:        Which pagedir to write.
- *
- * Returns:
- *        Zero on success or -1 on failure.
- **/
-int write_pageset(struct pagedir *pagedir)
-{
-        int finish_at, base = 0;
-        int barmax = pagedir1.size + pagedir2.size;
-        long error = 0;
-        struct memory_bitmap *pageflags;
-        unsigned long start_time, end_time;
-
-        /*
-         * Even if there is nothing to read or write, the allocator
-         * may need the init/cleanup for it's housekeeping.  (eg:
-         * Pageset1 may start where pageset2 ends when writing).
-         */
-        finish_at = pagedir->size;
-
-        if (pagedir->id == 1) {
-                toi_prepare_status(DONT_CLEAR_BAR,
-                                "Writing kernel & process data...");
-                base = pagedir2.size;
-                if (test_action_state(TOI_TEST_FILTER_SPEED) ||
-                    test_action_state(TOI_TEST_BIO))
-                        pageflags = pageset1_map;
-                else
-                        pageflags = pageset1_copy_map;
-        } else {
-                toi_prepare_status(DONT_CLEAR_BAR, "Writing caches...");
-                pageflags = pageset2_map;
-        }
-
-        start_time = jiffies;
-
-        if (rw_init_modules(WRITE, pagedir->id)) {
-                abort_hibernate(TOI_FAILED_MODULE_INIT,
-                                "Failed to initialise modules for writing.");
-                error = 1;
-        }
-
-        if (!error)
-                error = do_rw_loop(WRITE, finish_at, pageflags, base, barmax,
-                                pagedir->id);
-
-        if (rw_cleanup_modules(WRITE) && !error) {
-                abort_hibernate(TOI_FAILED_MODULE_CLEANUP,
-                                "Failed to cleanup after writing.");
-                error = 1;
-        }
-
-        end_time = jiffies;
-
-        if ((end_time - start_time) && (!test_result_state(TOI_ABORTED))) {
-                toi_bkd.toi_io_time[0][0] += finish_at,
-                toi_bkd.toi_io_time[0][1] += (end_time - start_time);
-        }
-
-        return error;
-}
-
-/**
- * read_pageset - highlevel function to read a pageset from disk
- * @pagedir:                        pageset to read
- * @overwrittenpagesonly:        Whether to read the whole pageset or
- *                                only part of it.
- *
- * Returns:
- *        Zero on success or -1 on failure.
- **/
-static int read_pageset(struct pagedir *pagedir, int overwrittenpagesonly)
-{
-        int result = 0, base = 0;
-        int finish_at = pagedir->size;
-        int barmax = pagedir1.size + pagedir2.size;
-        struct memory_bitmap *pageflags;
-        unsigned long start_time, end_time;
-
-        if (pagedir->id == 1) {
-                toi_prepare_status(DONT_CLEAR_BAR,
-                                "Reading kernel & process data...");
-                pageflags = pageset1_map;
-        } else {
-                toi_prepare_status(DONT_CLEAR_BAR, "Reading caches...");
-                if (overwrittenpagesonly) {
-                        barmax = min(pagedir1.size, pagedir2.size);
-                        finish_at = min(pagedir1.size, pagedir2.size);
-                } else
-                        base = pagedir1.size;
-                pageflags = pageset2_map;
-        }
-
-        start_time = jiffies;
-
-        if (rw_init_modules(READ, pagedir->id)) {
-                toiActiveAllocator->remove_image();
-                result = 1;
-        } else
-                result = do_rw_loop(READ, finish_at, pageflags, base, barmax,
-                                pagedir->id);
-
-        if (rw_cleanup_modules(READ) && !result) {
-                abort_hibernate(TOI_FAILED_MODULE_CLEANUP,
-                                "Failed to cleanup after reading.");
-                result = 1;
-        }
-
-        /* Statistics */
-        end_time = jiffies;
-
-        if ((end_time - start_time) && (!test_result_state(TOI_ABORTED))) {
-                toi_bkd.toi_io_time[1][0] += finish_at,
-                toi_bkd.toi_io_time[1][1] += (end_time - start_time);
-        }
-
-        return result;
-}
-
-/**
- * write_module_configs - store the modules configuration
- *
- * The configuration for each module is stored in the image header.
- * Returns: Int
- *        Zero on success, Error value otherwise.
- **/
-static int write_module_configs(void)
-{
-        struct toi_module_ops *this_module;
-        char *buffer = (char *) toi_get_zeroed_page(22, TOI_ATOMIC_GFP);
-        int len, index = 1;
-        struct toi_module_header toi_module_header;
-
-        if (!buffer) {
-                printk(KERN_INFO "Failed to allocate a buffer for saving "
-                                "module configuration info.\n");
-                return -ENOMEM;
-        }
-
-        /*
-         * We have to know which data goes with which module, so we at
-         * least write a length of zero for a module. Note that we are
-         * also assuming every module's config data takes <= PAGE_SIZE.
-         */
-
-        /* For each module (in registration order) */
-        list_for_each_entry(this_module, &toi_modules, module_list) {
-                if (!this_module->enabled || !this_module->storage_needed ||
-                    (this_module->type == WRITER_MODULE &&
-                     toiActiveAllocator != this_module))
-                        continue;
-
-                /* Get the data from the module */
-                len = 0;
-                if (this_module->save_config_info)
-                        len = this_module->save_config_info(buffer);
-
-                /* Save the details of the module */
-                toi_module_header.enabled = this_module->enabled;
-                toi_module_header.type = this_module->type;
-                toi_module_header.index = index++;
-                strncpy(toi_module_header.name, this_module->name,
-                                        sizeof(toi_module_header.name));
-                toiActiveAllocator->rw_header_chunk(WRITE,
-                                this_module,
-                                (char *) &toi_module_header,
-                                sizeof(toi_module_header));
-
-                /* Save the size of the data and any data returned */
-                toiActiveAllocator->rw_header_chunk(WRITE,
-                                this_module,
-                                (char *) &len, sizeof(int));
-                if (len)
-                        toiActiveAllocator->rw_header_chunk(
-                                WRITE, this_module, buffer, len);
-        }
-
-        /* Write a blank header to terminate the list */
-        toi_module_header.name[0] = '\0';
-        toiActiveAllocator->rw_header_chunk(WRITE, NULL,
-                        (char *) &toi_module_header, sizeof(toi_module_header));
-
-        toi_free_page(22, (unsigned long) buffer);
-        return 0;
-}
-
-/**
- * read_one_module_config - read and configure one module
- *
- * Read the configuration for one module, and configure the module
- * to match if it is loaded.
- *
- * Returns: Int
- *        Zero on success, Error value otherwise.
- **/
-static int read_one_module_config(struct toi_module_header *header)
-{
-        struct toi_module_ops *this_module;
-        int result, len;
-        char *buffer;
-
-        /* Find the module */
-        this_module = toi_find_module_given_name(header->name);
-
-        if (!this_module) {
-                if (header->enabled) {
-                        toi_early_boot_message(1, TOI_CONTINUE_REQ,
-                                "It looks like we need module %s for reading "
-                                "the image but it hasn't been registered.\n",
-                                header->name);
-                        if (!(test_toi_state(TOI_CONTINUE_REQ)))
-                                return -EINVAL;
-                } else
-                        printk(KERN_INFO "Module %s configuration data found, "
-                                "but the module hasn't registered. Looks like "
-                                "it was disabled, so we're ignoring its data.",
-                                header->name);
-        }
-
-        /* Get the length of the data (if any) */
-        result = toiActiveAllocator->rw_header_chunk(READ, NULL, (char *) &len,
-                        sizeof(int));
-        if (result) {
-                printk(KERN_ERR "Failed to read the length of the module %s's"
-                                " configuration data.\n",
-                                header->name);
-                return -EINVAL;
-        }
-
-        /* Read any data and pass to the module (if we found one) */
-        if (!len)
-                return 0;
-
-        buffer = (char *) toi_get_zeroed_page(23, TOI_ATOMIC_GFP);
-
-        if (!buffer) {
-                printk(KERN_ERR "Failed to allocate a buffer for reloading "
-                                "module configuration info.\n");
-                return -ENOMEM;
-        }
-
-        toiActiveAllocator->rw_header_chunk(READ, NULL, buffer, len);
-
-        if (!this_module)
-                goto out;
-
-        if (!this_module->save_config_info)
-                printk(KERN_ERR "Huh? Module %s appears to have a "
-                                "save_config_info, but not a load_config_info "
-                                "function!\n", this_module->name);
-        else
-                this_module->load_config_info(buffer, len);
-
-        /*
-         * Now move this module to the tail of its lists. This will put it in
-         * order. Any new modules will end up at the top of the lists. They
-         * should have been set to disabled when loaded (people will
-         * normally not edit an initrd to load a new module and then hibernate
-         * without using it!).
-         */
-
-        toi_move_module_tail(this_module);
-
-        this_module->enabled = header->enabled;
-
-out:
-        toi_free_page(23, (unsigned long) buffer);
-        return 0;
-}
-
-/**
- * read_module_configs - reload module configurations from the image header.
- *
- * Returns: Int
- *        Zero on success or an error code.
- **/
-static int read_module_configs(void)
-{
-        int result = 0;
-        struct toi_module_header toi_module_header;
-        struct toi_module_ops *this_module;
-
-        /* All modules are initially disabled. That way, if we have a module
-         * loaded now that wasn't loaded when we hibernated, it won't be used
-         * in trying to read the data.
-         */
-        list_for_each_entry(this_module, &toi_modules, module_list)
-                this_module->enabled = 0;
-
-        /* Get the first module header */
-        result = toiActiveAllocator->rw_header_chunk(READ, NULL,
-                        (char *) &toi_module_header,
-                        sizeof(toi_module_header));
-        if (result) {
-                printk(KERN_ERR "Failed to read the next module header.\n");
-                return -EINVAL;
-        }
-
-        /* For each module (in registration order) */
-        while (toi_module_header.name[0]) {
-                result = read_one_module_config(&toi_module_header);
-
-                if (result)
-                        return -EINVAL;
-
-                /* Get the next module header */
-                result = toiActiveAllocator->rw_header_chunk(READ, NULL,
-                                (char *) &toi_module_header,
-                                sizeof(toi_module_header));
-
-                if (result) {
-                        printk(KERN_ERR "Failed to read the next module "
-                                        "header.\n");
-                        return -EINVAL;
-                }
-        }
-
-        return 0;
-}
-
-static inline int save_fs_info(struct fs_info *fs, struct block_device *bdev)
-{
-        return (!fs || IS_ERR(fs) || !fs->last_mount_size) ? 0 : 1;
-}
-
-int fs_info_space_needed(void)
-{
-        const struct super_block *sb;
-        int result = sizeof(int);
-
-        list_for_each_entry(sb, &super_blocks, s_list) {
-                struct fs_info *fs;
-
-                if (!sb->s_bdev)
-                        continue;
-
-                fs = fs_info_from_block_dev(sb->s_bdev);
-                if (save_fs_info(fs, sb->s_bdev))
-                        result += 16 + sizeof(dev_t) + sizeof(int) +
-                                fs->last_mount_size;
-                free_fs_info(fs);
-        }
-        return result;
-}
-
-static int fs_info_num_to_save(void)
-{
-        const struct super_block *sb;
-        int to_save = 0;
-
-        list_for_each_entry(sb, &super_blocks, s_list) {
-                struct fs_info *fs;
-
-                if (!sb->s_bdev)
-                        continue;
-
-                fs = fs_info_from_block_dev(sb->s_bdev);
-                if (save_fs_info(fs, sb->s_bdev))
-                        to_save++;
-                free_fs_info(fs);
-        }
-
-        return to_save;
-}
-
-static int fs_info_save(void)
-{
-        const struct super_block *sb;
-        int to_save = fs_info_num_to_save();
-
-        if (toiActiveAllocator->rw_header_chunk(WRITE, NULL, (char *) &to_save,
-                                sizeof(int))) {
-                abort_hibernate(TOI_FAILED_IO, "Failed to write num fs_info"
-                                " to save.");
-                return -EIO;
-        }
-
-        list_for_each_entry(sb, &super_blocks, s_list) {
-                struct fs_info *fs;
-
-                if (!sb->s_bdev)
-                        continue;
-
-                fs = fs_info_from_block_dev(sb->s_bdev);
-                if (save_fs_info(fs, sb->s_bdev)) {
-                        if (toiActiveAllocator->rw_header_chunk(WRITE, NULL,
-                                        &fs->uuid[0], 16)) {
-                                abort_hibernate(TOI_FAILED_IO, "Failed to "
-                                                "write uuid.");
-                                return -EIO;
-                        }
-                        if (toiActiveAllocator->rw_header_chunk(WRITE, NULL,
-                                        (char *) &fs->dev_t, sizeof(dev_t))) {
-                                abort_hibernate(TOI_FAILED_IO, "Failed to "
-                                                "write dev_t.");
-                                return -EIO;
-                        }
-                        if (toiActiveAllocator->rw_header_chunk(WRITE, NULL,
-                                        (char *) &fs->last_mount_size, sizeof(int))) {
-                                abort_hibernate(TOI_FAILED_IO, "Failed to "
-                                                "write last mount length.");
-                                return -EIO;
-                        }
-                        if (toiActiveAllocator->rw_header_chunk(WRITE, NULL,
-                                        fs->last_mount, fs->last_mount_size)) {
-                                abort_hibernate(TOI_FAILED_IO, "Failed to "
-                                                "write uuid.");
-                                return -EIO;
-                        }
-                }
-                free_fs_info(fs);
-        }
-        return 0;
-}
-
-static int fs_info_load_and_check_one(void)
-{
-        char uuid[16], *last_mount;
-        int result = 0, ln;
-        dev_t dev_t;
-        struct block_device *dev;
-        struct fs_info *fs_info, seek;
-
-        if (toiActiveAllocator->rw_header_chunk(READ, NULL, uuid, 16)) {
-                abort_hibernate(TOI_FAILED_IO, "Failed to read uuid.");
-                return -EIO;
-        }
-
-        read_if_version(3, dev_t, "uuid dev_t field", return -EIO);
-
-        if (toiActiveAllocator->rw_header_chunk(READ, NULL, (char *) &ln,
-                                sizeof(int))) {
-                abort_hibernate(TOI_FAILED_IO,
-                                "Failed to read last mount size.");
-                return -EIO;
-        }
-
-        last_mount = kzalloc(ln, GFP_KERNEL);
-
-        if (!last_mount)
-                return -ENOMEM;
-
-        if (toiActiveAllocator->rw_header_chunk(READ, NULL, last_mount,        ln)) {
-                abort_hibernate(TOI_FAILED_IO,
-                                "Failed to read last mount timestamp.");
-                result = -EIO;
-                goto out_lmt;
-        }
-
-        strncpy((char *) &seek.uuid, uuid, 16);
-        seek.dev_t = dev_t;
-        seek.last_mount_size = ln;
-        seek.last_mount = last_mount;
-        dev_t = blk_lookup_fs_info(&seek);
-        if (!dev_t)
-                goto out_lmt;
-
-        dev = toi_open_by_devnum(dev_t);
-
-        fs_info = fs_info_from_block_dev(dev);
-        if (fs_info && !IS_ERR(fs_info)) {
-                if (ln != fs_info->last_mount_size) {
-                        printk(KERN_EMERG "Found matching uuid but last mount "
-                                        "time lengths differ?! "
-                                        "(%d vs %d).\n", ln,
-                                        fs_info->last_mount_size);
-                        result = -EINVAL;
-                } else {
-                        char buf[BDEVNAME_SIZE];
-                        result = !!memcmp(fs_info->last_mount, last_mount, ln);
-                        if (result)
-                                printk(KERN_EMERG "Last mount time for %s has "
-                                        "changed!\n", bdevname(dev, buf));
-                }
-        }
-        toi_close_bdev(dev);
-        free_fs_info(fs_info);
-out_lmt:
-        kfree(last_mount);
-        return result;
-}
-
-static int fs_info_load_and_check(void)
-{
-        int to_do, result = 0;
-
-        if (toiActiveAllocator->rw_header_chunk(READ, NULL, (char *) &to_do,
-                                sizeof(int))) {
-                abort_hibernate(TOI_FAILED_IO, "Failed to read num fs_info "
-                                "to load.");
-                return -EIO;
-        }
-
-        while(to_do--)
-                result |= fs_info_load_and_check_one();
-
-        return result;
-}
-
-/**
- * write_image_header - write the image header after write the image proper
- *
- * Returns: Int
- *        Zero on success, error value otherwise.
- **/
-int write_image_header(void)
-{
-        int ret;
-        int total = pagedir1.size + pagedir2.size+2;
-        char *header_buffer = NULL;
-
-        /* Now prepare to write the header */
-        ret = toiActiveAllocator->write_header_init();
-        if (ret) {
-                abort_hibernate(TOI_FAILED_MODULE_INIT,
-                                "Active allocator's write_header_init"
-                                " function failed.");
-                goto write_image_header_abort;
-        }
-
-        /* Get a buffer */
-        header_buffer = (char *) toi_get_zeroed_page(24, TOI_ATOMIC_GFP);
-        if (!header_buffer) {
-                abort_hibernate(TOI_OUT_OF_MEMORY,
-                        "Out of memory when trying to get page for header!");
-                goto write_image_header_abort;
-        }
-
-        /* Write hibernate header */
-        if (fill_toi_header((struct toi_header *) header_buffer)) {
-                abort_hibernate(TOI_OUT_OF_MEMORY,
-                        "Failure to fill header information!");
-                goto write_image_header_abort;
-        }
-
-        if (toiActiveAllocator->rw_header_chunk(WRITE, NULL,
-                        header_buffer, sizeof(struct toi_header))) {
-                abort_hibernate(TOI_OUT_OF_MEMORY,
-                        "Failure to write header info.");
-                goto write_image_header_abort;
-        }
-
-        if (toiActiveAllocator->rw_header_chunk(WRITE, NULL,
-                        (char *) &toi_max_workers, sizeof(toi_max_workers))) {
-                abort_hibernate(TOI_OUT_OF_MEMORY,
-                        "Failure to number of workers to use.");
-                goto write_image_header_abort;
-        }
-
-        /* Write filesystem info */
-        if (fs_info_save())
-                goto write_image_header_abort;
-
-        /* Write module configurations */
-        ret = write_module_configs();
-        if (ret) {
-                abort_hibernate(TOI_FAILED_IO,
-                                "Failed to write module configs.");
-                goto write_image_header_abort;
-        }
-
-        if (memory_bm_write(pageset1_map,
-                                toiActiveAllocator->rw_header_chunk)) {
-                abort_hibernate(TOI_FAILED_IO,
-                                "Failed to write bitmaps.");
-                goto write_image_header_abort;
-        }
-
-        /* Flush data and let allocator cleanup */
-        if (toiActiveAllocator->write_header_cleanup()) {
-                abort_hibernate(TOI_FAILED_IO,
-                                "Failed to cleanup writing header.");
-                goto write_image_header_abort_no_cleanup;
-        }
-
-        if (test_result_state(TOI_ABORTED))
-                goto write_image_header_abort_no_cleanup;
-
-        toi_update_status(total, total, NULL);
-
-out:
-        if (header_buffer)
-                toi_free_page(24, (unsigned long) header_buffer);
-        return ret;
-
-write_image_header_abort:
-        toiActiveAllocator->write_header_cleanup();
-write_image_header_abort_no_cleanup:
-        ret = -1;
-        goto out;
-}
-
-/**
- * sanity_check - check the header
- * @sh:        the header which was saved at hibernate time.
- *
- * Perform a few checks, seeking to ensure that the kernel being
- * booted matches the one hibernated. They need to match so we can
- * be _sure_ things will work. It is not absolutely impossible for
- * resuming from a different kernel to work, just not assured.
- **/
-static char *sanity_check(struct toi_header *sh)
-{
-        char *reason = check_image_kernel((struct swsusp_info *) sh);
-
-        if (reason)
-                return reason;
-
-        if (!test_action_state(TOI_IGNORE_ROOTFS)) {
-                const struct super_block *sb;
-                list_for_each_entry(sb, &super_blocks, s_list) {
-                        if ((!(sb->s_flags & MS_RDONLY)) &&
-                            (sb->s_type->fs_flags & FS_REQUIRES_DEV))
-                                return "Device backed fs has been mounted "
-                                        "rw prior to resume or initrd/ramfs "
-                                        "is mounted rw.";
-                }
-        }
-
-        return NULL;
-}
-
-static DECLARE_WAIT_QUEUE_HEAD(freeze_wait);
-
-#define FREEZE_IN_PROGRESS (~0)
-
-static int freeze_result;
-
-static void do_freeze(struct work_struct *dummy)
-{
-        freeze_result = freeze_processes();
-        wake_up(&freeze_wait);
-        trap_non_toi_io = 1;
-}
-
-static DECLARE_WORK(freeze_work, do_freeze);
-
-/**
- * __read_pageset1 - test for the existence of an image and attempt to load it
- *
- * Returns:        Int
- *        Zero if image found and pageset1 successfully loaded.
- *        Error if no image found or loaded.
- **/
-static int __read_pageset1(void)
-{
-        int i, result = 0;
-        char *header_buffer = (char *) toi_get_zeroed_page(25, TOI_ATOMIC_GFP),
-             *sanity_error = NULL;
-        struct toi_header *toi_header;
-
-        if (!header_buffer) {
-                printk(KERN_INFO "Unable to allocate a page for reading the "
-                                "signature.\n");
-                return -ENOMEM;
-        }
-
-        /* Check for an image */
-        result = toiActiveAllocator->image_exists(1);
-        if (result == 3) {
-                result = -ENODATA;
-                toi_early_boot_message(1, 0, "The signature from an older "
-                                "version of TuxOnIce has been detected.");
-                goto out_remove_image;
-        }
-
-        if (result != 1) {
-                result = -ENODATA;
-                noresume_reset_modules();
-                printk(KERN_INFO "TuxOnIce: No image found.\n");
-                goto out;
-        }
-
-        /*
-         * Prepare the active allocator for reading the image header. The
-         * activate allocator might read its own configuration.
-         *
-         * NB: This call may never return because there might be a signature
-         * for a different image such that we warn the user and they choose
-         * to reboot. (If the device ids look erroneous (2.4 vs 2.6) or the
-         * location of the image might be unavailable if it was stored on a
-         * network connection).
-         */
-
-        result = toiActiveAllocator->read_header_init();
-        if (result) {
-                printk(KERN_INFO "TuxOnIce: Failed to initialise, reading the "
-                                "image header.\n");
-                goto out_remove_image;
-        }
-
-        /* Check for noresume command line option */
-        if (test_toi_state(TOI_NORESUME_SPECIFIED)) {
-                printk(KERN_INFO "TuxOnIce: Noresume on command line. Removed "
-                                "image.\n");
-                goto out_remove_image;
-        }
-
-        /* Check whether we've resumed before */
-        if (test_toi_state(TOI_RESUMED_BEFORE)) {
-                toi_early_boot_message(1, 0, NULL);
-                if (!(test_toi_state(TOI_CONTINUE_REQ))) {
-                        printk(KERN_INFO "TuxOnIce: Tried to resume before: "
-                                        "Invalidated image.\n");
-                        goto out_remove_image;
-                }
-        }
-
-        clear_toi_state(TOI_CONTINUE_REQ);
-
-        toi_image_header_version = toiActiveAllocator->get_header_version();
-
-        if (unlikely(toi_image_header_version > TOI_HEADER_VERSION)) {
-                toi_early_boot_message(1, 0, image_version_error);
-                if (!(test_toi_state(TOI_CONTINUE_REQ))) {
-                        printk(KERN_INFO "TuxOnIce: Header version too new: "
-                                        "Invalidated image.\n");
-                        goto out_remove_image;
-                }
-        }
-
-        /* Read hibernate header */
-        result = toiActiveAllocator->rw_header_chunk(READ, NULL,
-                        header_buffer, sizeof(struct toi_header));
-        if (result < 0) {
-                printk(KERN_ERR "TuxOnIce: Failed to read the image "
-                                "signature.\n");
-                goto out_remove_image;
-        }
-
-        toi_header = (struct toi_header *) header_buffer;
-
-        /*
-         * NB: This call may also result in a reboot rather than returning.
-         */
-
-        sanity_error = sanity_check(toi_header);
-        if (sanity_error) {
-                toi_early_boot_message(1, TOI_CONTINUE_REQ,
-                                sanity_error);
-                printk(KERN_INFO "TuxOnIce: Sanity check failed.\n");
-                goto out_remove_image;
-        }
-
-        /*
-         * We have an image and it looks like it will load okay.
-         *
-         * Get metadata from header. Don't override commandline parameters.
-         *
-         * We don't need to save the image size limit because it's not used
-         * during resume and will be restored with the image anyway.
-         */
-
-        memcpy((char *) &pagedir1,
-                (char *) &toi_header->pagedir, sizeof(pagedir1));
-        toi_result = toi_header->param0;
-        if (!toi_bkd.toi_debug_state) {
-                toi_bkd.toi_action =
-                        (toi_header->param1 & ~toi_bootflags_mask) |
-                        (toi_bkd.toi_action & toi_bootflags_mask);
-                toi_bkd.toi_debug_state = toi_header->param2;
-                toi_bkd.toi_default_console_level = toi_header->param3;
-        }
-        clear_toi_state(TOI_IGNORE_LOGLEVEL);
-        pagedir2.size = toi_header->pageset_2_size;
-        for (i = 0; i < 4; i++)
-                toi_bkd.toi_io_time[i/2][i%2] =
-                        toi_header->io_time[i/2][i%2];
-
-        set_toi_state(TOI_BOOT_KERNEL);
-        boot_kernel_data_buffer = toi_header->bkd;
-
-        read_if_version(1, toi_max_workers, "TuxOnIce max workers",
-                        goto out_remove_image);
-
-        /* Read filesystem info */
-        if (fs_info_load_and_check()) {
-                printk(KERN_EMERG "TuxOnIce: File system mount time checks "
-                        "failed. Refusing to corrupt your filesystems!\n");
-                goto out_remove_image;
-        }
-
-        /* Read module configurations */
-        result = read_module_configs();
-        if (result) {
-                pagedir1.size = 0;
-                pagedir2.size = 0;
-                printk(KERN_INFO "TuxOnIce: Failed to read TuxOnIce module "
-                                "configurations.\n");
-                clear_action_state(TOI_KEEP_IMAGE);
-                goto out_remove_image;
-        }
-
-        toi_prepare_console();
-
-        set_toi_state(TOI_NOW_RESUMING);
-
-        result = pm_notifier_call_chain(PM_RESTORE_PREPARE);
-        if (result)
-                goto out_notifier_call_chain;;
-
-        if (usermodehelper_disable())
-                goto out_enable_usermodehelper;
-
-        current->flags |= PF_NOFREEZE;
-        freeze_result = FREEZE_IN_PROGRESS;
-
-        schedule_work_on(cpumask_first(cpu_online_mask), &freeze_work);
-
-        toi_cond_pause(1, "About to read original pageset1 locations.");
-
-        /*
-         * See _toi_rw_header_chunk in tuxonice_bio.c:
-         * Initialize pageset1_map by reading the map from the image.
-         */
-        if (memory_bm_read(pageset1_map, toiActiveAllocator->rw_header_chunk))
-                goto out_thaw;
-
-        /*
-         * See toi_rw_cleanup in tuxonice_bio.c:
-         * Clean up after reading the header.
-         */
-        result = toiActiveAllocator->read_header_cleanup();
-        if (result) {
-                printk(KERN_ERR "TuxOnIce: Failed to cleanup after reading the "
-                                "image header.\n");
-                goto out_thaw;
-        }
-
-        toi_cond_pause(1, "About to read pagedir.");
-
-        /*
-         * Get the addresses of pages into which we will load the kernel to
-         * be copied back and check if they conflict with the ones we are using.
-         */
-        if (toi_get_pageset1_load_addresses()) {
-                printk(KERN_INFO "TuxOnIce: Failed to get load addresses for "
-                                "pageset1.\n");
-                goto out_thaw;
-        }
-
-        /* Read the original kernel back */
-        toi_cond_pause(1, "About to read pageset 1.");
-
-        /* Given the pagemap, read back the data from disk */
-        if (read_pageset(&pagedir1, 0)) {
-                toi_prepare_status(DONT_CLEAR_BAR, "Failed to read pageset 1.");
-                result = -EIO;
-                goto out_thaw;
-        }
-
-        toi_cond_pause(1, "About to restore original kernel.");
-        result = 0;
-
-        if (!toi_keeping_image &&
-            toiActiveAllocator->mark_resume_attempted)
-                toiActiveAllocator->mark_resume_attempted(1);
-
-        wait_event(freeze_wait, freeze_result != FREEZE_IN_PROGRESS);
-out:
-        current->flags &= ~PF_NOFREEZE;
-        toi_free_page(25, (unsigned long) header_buffer);
-        return result;
-
-out_thaw:
-        wait_event(freeze_wait, freeze_result != FREEZE_IN_PROGRESS);
-        trap_non_toi_io = 0;
-        thaw_processes();
-out_enable_usermodehelper:
-        usermodehelper_enable();
-out_notifier_call_chain:
-        pm_notifier_call_chain(PM_POST_RESTORE);
-        toi_cleanup_console();
-out_remove_image:
-        result = -EINVAL;
-        if (!toi_keeping_image)
-                toiActiveAllocator->remove_image();
-        toiActiveAllocator->read_header_cleanup();
-        noresume_reset_modules();
-        goto out;
-}
-
-/**
- * read_pageset1 - highlevel function to read the saved pages
- *
- * Attempt to read the header and pageset1 of a hibernate image.
- * Handle the outcome, complaining where appropriate.
- **/
-int read_pageset1(void)
-{
-        int error;
-
-        error = __read_pageset1();
-
-        if (error && error != -ENODATA && error != -EINVAL &&
-                                        !test_result_state(TOI_ABORTED))
-                abort_hibernate(TOI_IMAGE_ERROR,
-                        "TuxOnIce: Error %d resuming\n", error);
-
-        return error;
-}
-
-/**
- * get_have_image_data - check the image header
- **/
-static char *get_have_image_data(void)
-{
-        char *output_buffer = (char *) toi_get_zeroed_page(26, TOI_ATOMIC_GFP);
-        struct toi_header *toi_header;
-
-        if (!output_buffer) {
-                printk(KERN_INFO "Output buffer null.\n");
-                return NULL;
-        }
-
-        /* Check for an image */
-        if (!toiActiveAllocator->image_exists(1) ||
-            toiActiveAllocator->read_header_init() ||
-            toiActiveAllocator->rw_header_chunk(READ, NULL,
-                        output_buffer, sizeof(struct toi_header))) {
-                sprintf(output_buffer, "0\n");
-                /*
-                 * From an initrd/ramfs, catting have_image and
-                 * getting a result of 0 is sufficient.
-                 */
-                clear_toi_state(TOI_BOOT_TIME);
-                goto out;
-        }
-
-        toi_header = (struct toi_header *) output_buffer;
-
-        sprintf(output_buffer, "1\n%s\n%s\n",
-                        toi_header->uts.machine,
-                        toi_header->uts.version);
-
-        /* Check whether we've resumed before */
-        if (test_toi_state(TOI_RESUMED_BEFORE))
-                strcat(output_buffer, "Resumed before.\n");
-
-out:
-        noresume_reset_modules();
-        return output_buffer;
-}
-
-/**
- * read_pageset2 - read second part of the image
- * @overwrittenpagesonly:        Read only pages which would have been
- *                                verwritten by pageset1?
- *
- * Read in part or all of pageset2 of an image, depending upon
- * whether we are hibernating and have only overwritten a portion
- * with pageset1 pages, or are resuming and need to read them
- * all.
- *
- * Returns: Int
- *        Zero if no error, otherwise the error value.
- **/
-int read_pageset2(int overwrittenpagesonly)
-{
-        int result = 0;
-
-        if (!pagedir2.size)
-                return 0;
-
-        result = read_pageset(&pagedir2, overwrittenpagesonly);
-
-        toi_cond_pause(1, "Pagedir 2 read.");
-
-        return result;
-}
-
-/**
- * image_exists_read - has an image been found?
- * @page:        Output buffer
- *
- * Store 0 or 1 in page, depending on whether an image is found.
- * Incoming buffer is PAGE_SIZE and result is guaranteed
- * to be far less than that, so we don't worry about
- * overflow.
- **/
-int image_exists_read(const char *page, int count)
-{
-        int len = 0;
-        char *result;
-
-        if (toi_activate_storage(0))
-                return count;
-
-        if (!test_toi_state(TOI_RESUME_DEVICE_OK))
-                toi_attempt_to_parse_resume_device(0);
-
-        if (!toiActiveAllocator) {
-                len = sprintf((char *) page, "-1\n");
-        } else {
-                result = get_have_image_data();
-                if (result) {
-                        len = sprintf((char *) page, "%s",  result);
-                        toi_free_page(26, (unsigned long) result);
-                }
-        }
-
-        toi_deactivate_storage(0);
-
-        return len;
-}
-
-/**
- * image_exists_write - invalidate an image if one exists
- **/
-int image_exists_write(const char *buffer, int count)
-{
-        if (toi_activate_storage(0))
-                return count;
-
-        if (toiActiveAllocator && toiActiveAllocator->image_exists(1))
-                toiActiveAllocator->remove_image();
-
-        toi_deactivate_storage(0);
-
-        clear_result_state(TOI_KEPT_IMAGE);
-
-        return count;
-}