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Diffstat (limited to 'kernel/power/tuxonice_swap.c')
-rw-r--r--kernel/power/tuxonice_swap.c474
1 files changed, 0 insertions, 474 deletions
diff --git a/kernel/power/tuxonice_swap.c b/kernel/power/tuxonice_swap.c
deleted file mode 100644
index 9f555c932..000000000
--- a/kernel/power/tuxonice_swap.c
+++ /dev/null
@@ -1,474 +0,0 @@
-/*
- * kernel/power/tuxonice_swap.c
- *
- * Copyright (C) 2004-2015 Nigel Cunningham (nigel at nigelcunningham com au)
- *
- * Distributed under GPLv2.
- *
- * This file encapsulates functions for usage of swap space as a
- * backing store.
- */
-
-#include <linux/suspend.h>
-#include <linux/blkdev.h>
-#include <linux/swapops.h>
-#include <linux/swap.h>
-#include <linux/syscalls.h>
-#include <linux/fs_uuid.h>
-
-#include "tuxonice.h"
-#include "tuxonice_sysfs.h"
-#include "tuxonice_modules.h"
-#include "tuxonice_io.h"
-#include "tuxonice_ui.h"
-#include "tuxonice_extent.h"
-#include "tuxonice_bio.h"
-#include "tuxonice_alloc.h"
-#include "tuxonice_builtin.h"
-
-static struct toi_module_ops toi_swapops;
-
-/* For swapfile automatically swapon/off'd. */
-static char swapfilename[255] = "";
-static int toi_swapon_status;
-
-/* Swap Pages */
-static unsigned long swap_allocated;
-
-static struct sysinfo swapinfo;
-
-static int is_ram_backed(struct swap_info_struct *si)
-{
- if (!strncmp(si->bdev->bd_disk->disk_name, "ram", 3) ||
- !strncmp(si->bdev->bd_disk->disk_name, "zram", 4))
- return 1;
-
- return 0;
-}
-
-/**
- * enable_swapfile: Swapon the user specified swapfile prior to hibernating.
- *
- * Activate the given swapfile if it wasn't already enabled. Remember whether
- * we really did swapon it for swapoffing later.
- */
-static void enable_swapfile(void)
-{
- int activateswapresult = -EINVAL;
-
- if (swapfilename[0]) {
- /* Attempt to swap on with maximum priority */
- activateswapresult = sys_swapon(swapfilename, 0xFFFF);
- if (activateswapresult && activateswapresult != -EBUSY)
- printk(KERN_ERR "TuxOnIce: The swapfile/partition "
- "specified by /sys/power/tuxonice/swap/swapfile"
- " (%s) could not be turned on (error %d). "
- "Attempting to continue.\n",
- swapfilename, activateswapresult);
- if (!activateswapresult)
- toi_swapon_status = 1;
- }
-}
-
-/**
- * disable_swapfile: Swapoff any file swaponed at the start of the cycle.
- *
- * If we did successfully swapon a file at the start of the cycle, swapoff
- * it now (finishing up).
- */
-static void disable_swapfile(void)
-{
- if (!toi_swapon_status)
- return;
-
- sys_swapoff(swapfilename);
- toi_swapon_status = 0;
-}
-
-static int add_blocks_to_extent_chain(struct toi_bdev_info *chain,
- unsigned long start, unsigned long end)
-{
- if (test_action_state(TOI_TEST_BIO))
- toi_message(TOI_IO, TOI_VERBOSE, 0, "Adding extent %lu-%lu to "
- "chain %p.", start << chain->bmap_shift,
- end << chain->bmap_shift, chain);
-
- return toi_add_to_extent_chain(&chain->blocks, start, end);
-}
-
-
-static int get_main_pool_phys_params(struct toi_bdev_info *chain)
-{
- struct hibernate_extent *extentpointer = NULL;
- unsigned long address, extent_min = 0, extent_max = 0;
- int empty = 1;
-
- toi_message(TOI_IO, TOI_VERBOSE, 0, "get main pool phys params for "
- "chain %d.", chain->allocator_index);
-
- if (!chain->allocations.first)
- return 0;
-
- if (chain->blocks.first)
- toi_put_extent_chain(&chain->blocks);
-
- toi_extent_for_each(&chain->allocations, extentpointer, address) {
- swp_entry_t swap_address = (swp_entry_t) { address };
- struct block_device *bdev;
- sector_t new_sector = map_swap_entry(swap_address, &bdev);
-
- if (empty) {
- empty = 0;
- extent_min = extent_max = new_sector;
- continue;
- }
-
- if (new_sector == extent_max + 1) {
- extent_max++;
- continue;
- }
-
- if (add_blocks_to_extent_chain(chain, extent_min, extent_max)) {
- printk(KERN_ERR "Out of memory while making block "
- "chains.\n");
- return -ENOMEM;
- }
-
- extent_min = new_sector;
- extent_max = new_sector;
- }
-
- if (!empty &&
- add_blocks_to_extent_chain(chain, extent_min, extent_max)) {
- printk(KERN_ERR "Out of memory while making block chains.\n");
- return -ENOMEM;
- }
-
- return 0;
-}
-
-/*
- * Like si_swapinfo, except that we don't include ram backed swap (compcache!)
- * and don't need to use the spinlocks (userspace is stopped when this
- * function is called).
- */
-void si_swapinfo_no_compcache(void)
-{
- unsigned int i;
-
- si_swapinfo(&swapinfo);
- swapinfo.freeswap = 0;
- swapinfo.totalswap = 0;
-
- for (i = 0; i < MAX_SWAPFILES; i++) {
- struct swap_info_struct *si = get_swap_info_struct(i);
- if (si && (si->flags & SWP_WRITEOK) && !is_ram_backed(si)) {
- swapinfo.totalswap += si->inuse_pages;
- swapinfo.freeswap += si->pages - si->inuse_pages;
- }
- }
-}
-/*
- * We can't just remember the value from allocation time, because other
- * processes might have allocated swap in the mean time.
- */
-static unsigned long toi_swap_storage_available(void)
-{
- toi_message(TOI_IO, TOI_VERBOSE, 0, "In toi_swap_storage_available.");
- si_swapinfo_no_compcache();
- return swapinfo.freeswap + swap_allocated;
-}
-
-static int toi_swap_initialise(int starting_cycle)
-{
- if (!starting_cycle)
- return 0;
-
- enable_swapfile();
- return 0;
-}
-
-static void toi_swap_cleanup(int ending_cycle)
-{
- if (!ending_cycle)
- return;
-
- disable_swapfile();
-}
-
-static void toi_swap_free_storage(struct toi_bdev_info *chain)
-{
- /* Free swap entries */
- struct hibernate_extent *extentpointer;
- unsigned long extentvalue;
-
- toi_message(TOI_IO, TOI_VERBOSE, 0, "Freeing storage for chain %p.",
- chain);
-
- swap_allocated -= chain->allocations.size;
- toi_extent_for_each(&chain->allocations, extentpointer, extentvalue)
- swap_free((swp_entry_t) { extentvalue });
-
- toi_put_extent_chain(&chain->allocations);
-}
-
-static void free_swap_range(unsigned long min, unsigned long max)
-{
- int j;
-
- for (j = min; j <= max; j++)
- swap_free((swp_entry_t) { j });
- swap_allocated -= (max - min + 1);
-}
-
-/*
- * Allocation of a single swap type. Swap priorities are handled at the higher
- * level.
- */
-static int toi_swap_allocate_storage(struct toi_bdev_info *chain,
- unsigned long request)
-{
- unsigned long gotten = 0;
-
- toi_message(TOI_IO, TOI_VERBOSE, 0, " Swap allocate storage: Asked to"
- " allocate %lu pages from device %d.", request,
- chain->allocator_index);
-
- while (gotten < request) {
- swp_entry_t start, end;
- if (0) {
- /* Broken at the moment for SSDs */
- get_swap_range_of_type(chain->allocator_index, &start, &end,
- request - gotten + 1);
- } else {
- start = end = get_swap_page_of_type(chain->allocator_index);
- }
- if (start.val) {
- int added = end.val - start.val + 1;
- if (toi_add_to_extent_chain(&chain->allocations,
- start.val, end.val)) {
- printk(KERN_INFO "Failed to allocate extent for "
- "%lu-%lu.\n", start.val, end.val);
- free_swap_range(start.val, end.val);
- break;
- }
- gotten += added;
- swap_allocated += added;
- } else
- break;
- }
-
- toi_message(TOI_IO, TOI_VERBOSE, 0, " Allocated %lu pages.", gotten);
- return gotten;
-}
-
-static int toi_swap_register_storage(void)
-{
- int i, result = 0;
-
- toi_message(TOI_IO, TOI_VERBOSE, 0, "toi_swap_register_storage.");
- for (i = 0; i < MAX_SWAPFILES; i++) {
- struct swap_info_struct *si = get_swap_info_struct(i);
- struct toi_bdev_info *devinfo;
- unsigned char *p;
- unsigned char buf[256];
- struct fs_info *fs_info;
-
- if (!si || !(si->flags & SWP_WRITEOK) || is_ram_backed(si))
- continue;
-
- devinfo = toi_kzalloc(39, sizeof(struct toi_bdev_info),
- GFP_ATOMIC);
- if (!devinfo) {
- printk("Failed to allocate devinfo struct for swap "
- "device %d.\n", i);
- return -ENOMEM;
- }
-
- devinfo->bdev = si->bdev;
- devinfo->allocator = &toi_swapops;
- devinfo->allocator_index = i;
-
- fs_info = fs_info_from_block_dev(si->bdev);
- if (fs_info && !IS_ERR(fs_info)) {
- memcpy(devinfo->uuid, &fs_info->uuid, 16);
- free_fs_info(fs_info);
- } else
- result = (int) PTR_ERR(fs_info);
-
- if (!fs_info)
- printk("fs_info from block dev returned %d.\n", result);
- devinfo->dev_t = si->bdev->bd_dev;
- devinfo->prio = si->prio;
- devinfo->bmap_shift = 3;
- devinfo->blocks_per_page = 1;
-
- p = d_path(&si->swap_file->f_path, buf, sizeof(buf));
- sprintf(devinfo->name, "swap on %s", p);
-
- toi_message(TOI_IO, TOI_VERBOSE, 0, "Registering swap storage:"
- " Device %d (%lx), prio %d.", i,
- (unsigned long) devinfo->dev_t, devinfo->prio);
- toi_bio_ops.register_storage(devinfo);
- }
-
- return 0;
-}
-
-static unsigned long toi_swap_free_unused_storage(struct toi_bdev_info *chain, unsigned long used)
-{
- struct hibernate_extent *extentpointer = NULL;
- unsigned long extentvalue;
- unsigned long i = 0, first_freed = 0;
-
- toi_extent_for_each(&chain->allocations, extentpointer, extentvalue) {
- i++;
- if (i > used) {
- swap_free((swp_entry_t) { extentvalue });
- if (!first_freed)
- first_freed = extentvalue;
- }
- }
-
- return first_freed;
-}
-
-/*
- * workspace_size
- *
- * Description:
- * Returns the number of bytes of RAM needed for this
- * code to do its work. (Used when calculating whether
- * we have enough memory to be able to hibernate & resume).
- *
- */
-static int toi_swap_memory_needed(void)
-{
- return 1;
-}
-
-/*
- * Print debug info
- *
- * Description:
- */
-static int toi_swap_print_debug_stats(char *buffer, int size)
-{
- int len = 0;
-
- len = scnprintf(buffer, size, "- Swap Allocator enabled.\n");
- if (swapfilename[0])
- len += scnprintf(buffer+len, size-len,
- " Attempting to automatically swapon: %s.\n",
- swapfilename);
-
- si_swapinfo_no_compcache();
-
- len += scnprintf(buffer+len, size-len,
- " Swap available for image: %lu pages.\n",
- swapinfo.freeswap + swap_allocated);
-
- return len;
-}
-
-static int header_locations_read_sysfs(const char *page, int count)
-{
- int i, printedpartitionsmessage = 0, len = 0, haveswap = 0;
- struct inode *swapf = NULL;
- int zone;
- char *path_page = (char *) toi_get_free_page(10, GFP_KERNEL);
- char *path, *output = (char *) page;
- int path_len;
-
- if (!page)
- return 0;
-
- for (i = 0; i < MAX_SWAPFILES; i++) {
- struct swap_info_struct *si = get_swap_info_struct(i);
-
- if (!si || !(si->flags & SWP_WRITEOK))
- continue;
-
- if (S_ISBLK(si->swap_file->f_mapping->host->i_mode)) {
- haveswap = 1;
- if (!printedpartitionsmessage) {
- len += sprintf(output + len,
- "For swap partitions, simply use the "
- "format: resume=swap:/dev/hda1.\n");
- printedpartitionsmessage = 1;
- }
- } else {
- path_len = 0;
-
- path = d_path(&si->swap_file->f_path, path_page,
- PAGE_SIZE);
- path_len = snprintf(path_page, PAGE_SIZE, "%s", path);
-
- haveswap = 1;
- swapf = si->swap_file->f_mapping->host;
- zone = bmap(swapf, 0);
- if (!zone) {
- len += sprintf(output + len,
- "Swapfile %s has been corrupted. Reuse"
- " mkswap on it and try again.\n",
- path_page);
- } else {
- char name_buffer[BDEVNAME_SIZE];
- len += sprintf(output + len,
- "For swapfile `%s`,"
- " use resume=swap:/dev/%s:0x%x.\n",
- path_page,
- bdevname(si->bdev, name_buffer),
- zone << (swapf->i_blkbits - 9));
- }
- }
- }
-
- if (!haveswap)
- len = sprintf(output, "You need to turn on swap partitions "
- "before examining this file.\n");
-
- toi_free_page(10, (unsigned long) path_page);
- return len;
-}
-
-static struct toi_sysfs_data sysfs_params[] = {
- SYSFS_STRING("swapfilename", SYSFS_RW, swapfilename, 255, 0, NULL),
- SYSFS_CUSTOM("headerlocations", SYSFS_READONLY,
- header_locations_read_sysfs, NULL, 0, NULL),
- SYSFS_INT("enabled", SYSFS_RW, &toi_swapops.enabled, 0, 1, 0,
- attempt_to_parse_resume_device2),
-};
-
-static struct toi_bio_allocator_ops toi_bio_swapops = {
- .register_storage = toi_swap_register_storage,
- .storage_available = toi_swap_storage_available,
- .allocate_storage = toi_swap_allocate_storage,
- .bmap = get_main_pool_phys_params,
- .free_storage = toi_swap_free_storage,
- .free_unused_storage = toi_swap_free_unused_storage,
-};
-
-static struct toi_module_ops toi_swapops = {
- .type = BIO_ALLOCATOR_MODULE,
- .name = "swap storage",
- .directory = "swap",
- .module = THIS_MODULE,
- .memory_needed = toi_swap_memory_needed,
- .print_debug_info = toi_swap_print_debug_stats,
- .initialise = toi_swap_initialise,
- .cleanup = toi_swap_cleanup,
- .bio_allocator_ops = &toi_bio_swapops,
-
- .sysfs_data = sysfs_params,
- .num_sysfs_entries = sizeof(sysfs_params) /
- sizeof(struct toi_sysfs_data),
-};
-
-/* ---- Registration ---- */
-static __init int toi_swap_load(void)
-{
- return toi_register_module(&toi_swapops);
-}
-
-late_initcall(toi_swap_load);
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