From 670027c507e99521d416994a18a498def9ef2ea3 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Andr=C3=A9=20Fabian=20Silva=20Delgado?= Date: Sat, 22 Oct 2016 19:31:08 -0300 Subject: Linux-libre 4.8.3-gnu --- kernel/power/tuxonice_swap.c | 474 ------------------------------------------- 1 file changed, 474 deletions(-) delete mode 100644 kernel/power/tuxonice_swap.c (limited to 'kernel/power/tuxonice_swap.c') 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 -#include -#include -#include -#include -#include - -#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); -- cgit v1.2.3