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kernel/power/swap.c
34.1 KB
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/* * linux/kernel/power/swap.c * * This file provides functions for reading the suspend image from * and writing it to a swap partition. * |
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* Copyright (C) 1998,2001-2005 Pavel Machek <pavel@ucw.cz> |
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* Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl> |
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* Copyright (C) 2010 Bojan Smojver <bojan@rexursive.com> |
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* * This file is released under the GPLv2. * */ #include <linux/module.h> |
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#include <linux/file.h> |
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#include <linux/delay.h> #include <linux/bitops.h> #include <linux/genhd.h> #include <linux/device.h> |
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#include <linux/bio.h> |
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#include <linux/blkdev.h> |
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#include <linux/swap.h> #include <linux/swapops.h> #include <linux/pm.h> |
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#include <linux/slab.h> |
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#include <linux/lzo.h> #include <linux/vmalloc.h> |
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#include <linux/cpumask.h> #include <linux/atomic.h> #include <linux/kthread.h> #include <linux/crc32.h> |
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#include "power.h" |
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#define HIBERNATE_SIG "S1SUSPEND" |
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|
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/* * The swap map is a data structure used for keeping track of each page * written to a swap partition. It consists of many swap_map_page |
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* structures that contain each an array of MAP_PAGE_ENTRIES swap entries. |
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* These structures are stored on the swap and linked together with the * help of the .next_swap member. * * The swap map is created during suspend. The swap map pages are * allocated and populated one at a time, so we only need one memory * page to set up the entire structure. * |
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* During resume we pick up all swap_map_page structures into a list. |
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*/ #define MAP_PAGE_ENTRIES (PAGE_SIZE / sizeof(sector_t) - 1) struct swap_map_page { sector_t entries[MAP_PAGE_ENTRIES]; sector_t next_swap; }; |
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struct swap_map_page_list { struct swap_map_page *map; struct swap_map_page_list *next; }; |
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/** * The swap_map_handle structure is used for handling swap in * a file-alike way */ struct swap_map_handle { struct swap_map_page *cur; |
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struct swap_map_page_list *maps; |
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sector_t cur_swap; sector_t first_sector; unsigned int k; |
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unsigned long nr_free_pages, written; u32 crc32; |
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}; |
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struct swsusp_header { |
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char reserved[PAGE_SIZE - 20 - sizeof(sector_t) - sizeof(int) - sizeof(u32)]; u32 crc32; |
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sector_t image; |
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unsigned int flags; /* Flags to pass to the "boot" kernel */ |
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char orig_sig[10]; char sig[10]; |
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} __attribute__((packed)); static struct swsusp_header *swsusp_header; |
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/** * The following functions are used for tracing the allocated * swap pages, so that they can be freed in case of an error. */ struct swsusp_extent { struct rb_node node; unsigned long start; unsigned long end; }; static struct rb_root swsusp_extents = RB_ROOT; static int swsusp_extents_insert(unsigned long swap_offset) { struct rb_node **new = &(swsusp_extents.rb_node); struct rb_node *parent = NULL; struct swsusp_extent *ext; /* Figure out where to put the new node */ while (*new) { ext = container_of(*new, struct swsusp_extent, node); parent = *new; if (swap_offset < ext->start) { /* Try to merge */ if (swap_offset == ext->start - 1) { ext->start--; return 0; } new = &((*new)->rb_left); } else if (swap_offset > ext->end) { /* Try to merge */ if (swap_offset == ext->end + 1) { ext->end++; return 0; } new = &((*new)->rb_right); } else { /* It already is in the tree */ return -EINVAL; } } /* Add the new node and rebalance the tree. */ ext = kzalloc(sizeof(struct swsusp_extent), GFP_KERNEL); if (!ext) return -ENOMEM; ext->start = swap_offset; ext->end = swap_offset; rb_link_node(&ext->node, parent, new); rb_insert_color(&ext->node, &swsusp_extents); return 0; } /** * alloc_swapdev_block - allocate a swap page and register that it has * been allocated, so that it can be freed in case of an error. */ sector_t alloc_swapdev_block(int swap) { unsigned long offset; |
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offset = swp_offset(get_swap_page_of_type(swap)); |
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if (offset) { if (swsusp_extents_insert(offset)) |
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swap_free(swp_entry(swap, offset)); |
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else return swapdev_block(swap, offset); } return 0; } /** * free_all_swap_pages - free swap pages allocated for saving image data. |
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* It also frees the extents used to register which swap entries had been |
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* allocated. */ void free_all_swap_pages(int swap) { struct rb_node *node; while ((node = swsusp_extents.rb_node)) { struct swsusp_extent *ext; unsigned long offset; ext = container_of(node, struct swsusp_extent, node); rb_erase(node, &swsusp_extents); for (offset = ext->start; offset <= ext->end; offset++) |
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swap_free(swp_entry(swap, offset)); |
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kfree(ext); } } int swsusp_swap_in_use(void) { return (swsusp_extents.rb_node != NULL); } |
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/* |
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* General things |
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*/ static unsigned short root_swap = 0xffff; |
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struct block_device *hib_resume_bdev; |
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|
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/* * Saving part */ |
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|
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static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags) |
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{ int error; |
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hib_bio_read_page(swsusp_resume_block, swsusp_header, NULL); |
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if (!memcmp("SWAP-SPACE",swsusp_header->sig, 10) || !memcmp("SWAPSPACE2",swsusp_header->sig, 10)) { memcpy(swsusp_header->orig_sig,swsusp_header->sig, 10); |
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memcpy(swsusp_header->sig, HIBERNATE_SIG, 10); |
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swsusp_header->image = handle->first_sector; |
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swsusp_header->flags = flags; |
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if (flags & SF_CRC32_MODE) swsusp_header->crc32 = handle->crc32; |
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error = hib_bio_write_page(swsusp_resume_block, |
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swsusp_header, NULL); |
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} else { |
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printk(KERN_ERR "PM: Swap header not found! "); |
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error = -ENODEV; } return error; } /** * swsusp_swap_check - check if the resume device is a swap device * and get its index (if so) |
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* * This is called before saving image |
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*/ |
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static int swsusp_swap_check(void) |
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{ |
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int res; |
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res = swap_type_of(swsusp_resume_device, swsusp_resume_block, |
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&hib_resume_bdev); |
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if (res < 0) return res; root_swap = res; |
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res = blkdev_get(hib_resume_bdev, FMODE_WRITE, NULL); |
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if (res) return res; |
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|
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res = set_blocksize(hib_resume_bdev, PAGE_SIZE); |
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if (res < 0) |
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blkdev_put(hib_resume_bdev, FMODE_WRITE); |
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|
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return res; } /** * write_page - Write one page to given swap location. * @buf: Address we're writing. * @offset: Offset of the swap page we're writing to. |
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* @bio_chain: Link the next write BIO here |
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*/ |
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static int write_page(void *buf, sector_t offset, struct bio **bio_chain) |
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{ |
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void *src; |
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int ret; |
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if (!offset) return -ENOSPC; if (bio_chain) { |
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src = (void *)__get_free_page(__GFP_WAIT | __GFP_HIGH); |
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if (src) { |
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copy_page(src, buf); |
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} else { |
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ret = hib_wait_on_bio_chain(bio_chain); /* Free pages */ if (ret) return ret; src = (void *)__get_free_page(__GFP_WAIT | __GFP_HIGH); if (src) { copy_page(src, buf); } else { WARN_ON_ONCE(1); bio_chain = NULL; /* Go synchronous */ src = buf; } |
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} |
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} else { src = buf; |
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} |
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return hib_bio_write_page(offset, src, bio_chain); |
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} |
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static void release_swap_writer(struct swap_map_handle *handle) { if (handle->cur) free_page((unsigned long)handle->cur); handle->cur = NULL; |
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} static int get_swap_writer(struct swap_map_handle *handle) { |
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int ret; ret = swsusp_swap_check(); if (ret) { if (ret != -ENOSPC) printk(KERN_ERR "PM: Cannot find swap device, try " "swapon -a. "); return ret; } |
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handle->cur = (struct swap_map_page *)get_zeroed_page(GFP_KERNEL); |
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if (!handle->cur) { ret = -ENOMEM; goto err_close; } |
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handle->cur_swap = alloc_swapdev_block(root_swap); |
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if (!handle->cur_swap) { |
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ret = -ENOSPC; goto err_rel; |
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} handle->k = 0; |
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handle->nr_free_pages = nr_free_pages() >> 1; handle->written = 0; |
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handle->first_sector = handle->cur_swap; |
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return 0; |
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err_rel: release_swap_writer(handle); err_close: swsusp_close(FMODE_WRITE); return ret; |
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} |
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static int swap_write_page(struct swap_map_handle *handle, void *buf, struct bio **bio_chain) { int error = 0; |
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sector_t offset; |
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if (!handle->cur) return -EINVAL; |
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offset = alloc_swapdev_block(root_swap); |
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error = write_page(buf, offset, bio_chain); |
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if (error) return error; handle->cur->entries[handle->k++] = offset; if (handle->k >= MAP_PAGE_ENTRIES) { |
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offset = alloc_swapdev_block(root_swap); |
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if (!offset) return -ENOSPC; handle->cur->next_swap = offset; |
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error = write_page(handle->cur, handle->cur_swap, bio_chain); |
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if (error) |
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goto out; |
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clear_page(handle->cur); |
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handle->cur_swap = offset; handle->k = 0; } |
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if (bio_chain && ++handle->written > handle->nr_free_pages) { error = hib_wait_on_bio_chain(bio_chain); if (error) goto out; handle->written = 0; } |
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out: |
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return error; |
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} static int flush_swap_writer(struct swap_map_handle *handle) { if (handle->cur && handle->cur_swap) |
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return write_page(handle->cur, handle->cur_swap, NULL); |
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else return -EINVAL; } |
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static int swap_writer_finish(struct swap_map_handle *handle, unsigned int flags, int error) { if (!error) { flush_swap_writer(handle); printk(KERN_INFO "PM: S"); error = mark_swapfiles(handle, flags); printk("| "); } if (error) free_all_swap_pages(root_swap); release_swap_writer(handle); swsusp_close(FMODE_WRITE); return error; } |
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/* We need to remember how much compressed data we need to read. */ #define LZO_HEADER sizeof(size_t) /* Number of pages/bytes we'll compress at one time. */ #define LZO_UNC_PAGES 32 #define LZO_UNC_SIZE (LZO_UNC_PAGES * PAGE_SIZE) /* Number of pages/bytes we need for compressed data (worst case). */ #define LZO_CMP_PAGES DIV_ROUND_UP(lzo1x_worst_compress(LZO_UNC_SIZE) + \ LZO_HEADER, PAGE_SIZE) #define LZO_CMP_SIZE (LZO_CMP_PAGES * PAGE_SIZE) |
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/* Maximum number of threads for compression/decompression. */ #define LZO_THREADS 3 /* Maximum number of pages for read buffering. */ #define LZO_READ_PAGES (MAP_PAGE_ENTRIES * 8) |
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/** * save_image - save the suspend image data */ static int save_image(struct swap_map_handle *handle, struct snapshot_handle *snapshot, |
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unsigned int nr_to_write) |
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{ unsigned int m; int ret; |
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int nr_pages; |
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int err2; struct bio *bio; |
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struct timeval start; struct timeval stop; |
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|
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printk(KERN_INFO "PM: Saving image data pages (%u pages) ... ", nr_to_write); |
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m = nr_to_write / 100; |
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if (!m) m = 1; nr_pages = 0; |
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bio = NULL; |
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do_gettimeofday(&start); |
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while (1) { |
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ret = snapshot_read_next(snapshot); |
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if (ret <= 0) break; ret = swap_write_page(handle, data_of(*snapshot), &bio); if (ret) break; if (!(nr_pages % m)) |
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printk(KERN_CONT "\b\b\b\b%3d%%", nr_pages / m); |
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nr_pages++; } |
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err2 = hib_wait_on_bio_chain(&bio); |
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do_gettimeofday(&stop); |
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if (!ret) ret = err2; if (!ret) |
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printk(KERN_CONT "\b\b\b\bdone "); |
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else |
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printk(KERN_CONT " "); |
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swsusp_show_speed(&start, &stop, nr_to_write, "Wrote"); |
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return ret; |
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} |
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/** * Structure used for CRC32. */ struct crc_data { struct task_struct *thr; /* thread */ atomic_t ready; /* ready to start flag */ atomic_t stop; /* ready to stop flag */ unsigned run_threads; /* nr current threads */ wait_queue_head_t go; /* start crc update */ wait_queue_head_t done; /* crc update done */ u32 *crc32; /* points to handle's crc32 */ size_t *unc_len[LZO_THREADS]; /* uncompressed lengths */ unsigned char *unc[LZO_THREADS]; /* uncompressed data */ }; /** * CRC32 update function that runs in its own thread. */ static int crc32_threadfn(void *data) { struct crc_data *d = data; unsigned i; while (1) { wait_event(d->go, atomic_read(&d->ready) || kthread_should_stop()); if (kthread_should_stop()) { d->thr = NULL; atomic_set(&d->stop, 1); wake_up(&d->done); break; } atomic_set(&d->ready, 0); for (i = 0; i < d->run_threads; i++) *d->crc32 = crc32_le(*d->crc32, d->unc[i], *d->unc_len[i]); atomic_set(&d->stop, 1); wake_up(&d->done); } return 0; } /** * Structure used for LZO data compression. */ struct cmp_data { struct task_struct *thr; /* thread */ atomic_t ready; /* ready to start flag */ atomic_t stop; /* ready to stop flag */ int ret; /* return code */ wait_queue_head_t go; /* start compression */ wait_queue_head_t done; /* compression done */ size_t unc_len; /* uncompressed length */ size_t cmp_len; /* compressed length */ unsigned char unc[LZO_UNC_SIZE]; /* uncompressed buffer */ unsigned char cmp[LZO_CMP_SIZE]; /* compressed buffer */ unsigned char wrk[LZO1X_1_MEM_COMPRESS]; /* compression workspace */ }; /** * Compression function that runs in its own thread. */ static int lzo_compress_threadfn(void *data) { struct cmp_data *d = data; while (1) { wait_event(d->go, atomic_read(&d->ready) || kthread_should_stop()); if (kthread_should_stop()) { d->thr = NULL; d->ret = -1; atomic_set(&d->stop, 1); wake_up(&d->done); break; } atomic_set(&d->ready, 0); d->ret = lzo1x_1_compress(d->unc, d->unc_len, d->cmp + LZO_HEADER, &d->cmp_len, d->wrk); atomic_set(&d->stop, 1); wake_up(&d->done); } return 0; } |
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/** * save_image_lzo - Save the suspend image data compressed with LZO. * @handle: Swap mam handle to use for saving the image. * @snapshot: Image to read data from. * @nr_to_write: Number of pages to save. */ static int save_image_lzo(struct swap_map_handle *handle, struct snapshot_handle *snapshot, unsigned int nr_to_write) { unsigned int m; int ret = 0; int nr_pages; int err2; struct bio *bio; struct timeval start; struct timeval stop; |
081a9d043 PM / Hibernate: I... |
549 550 551 552 553 554 555 556 557 558 559 560 |
size_t off; unsigned thr, run_threads, nr_threads; unsigned char *page = NULL; struct cmp_data *data = NULL; struct crc_data *crc = NULL; /* * We'll limit the number of threads for compression to limit memory * footprint. */ nr_threads = num_online_cpus() - 1; nr_threads = clamp_val(nr_threads, 1, LZO_THREADS); |
f996fc967 PM / Hibernate: C... |
561 562 563 564 565 |
page = (void *)__get_free_page(__GFP_WAIT | __GFP_HIGH); if (!page) { printk(KERN_ERR "PM: Failed to allocate LZO page "); |
081a9d043 PM / Hibernate: I... |
566 567 |
ret = -ENOMEM; goto out_clean; |
f996fc967 PM / Hibernate: C... |
568 |
} |
081a9d043 PM / Hibernate: I... |
569 570 571 572 573 574 |
data = vmalloc(sizeof(*data) * nr_threads); if (!data) { printk(KERN_ERR "PM: Failed to allocate LZO data "); ret = -ENOMEM; goto out_clean; |
f996fc967 PM / Hibernate: C... |
575 |
} |
081a9d043 PM / Hibernate: I... |
576 577 |
for (thr = 0; thr < nr_threads; thr++) memset(&data[thr], 0, offsetof(struct cmp_data, go)); |
f996fc967 PM / Hibernate: C... |
578 |
|
081a9d043 PM / Hibernate: I... |
579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 |
crc = kmalloc(sizeof(*crc), GFP_KERNEL); if (!crc) { printk(KERN_ERR "PM: Failed to allocate crc "); ret = -ENOMEM; goto out_clean; } memset(crc, 0, offsetof(struct crc_data, go)); /* * Start the compression threads. */ for (thr = 0; thr < nr_threads; thr++) { init_waitqueue_head(&data[thr].go); init_waitqueue_head(&data[thr].done); data[thr].thr = kthread_run(lzo_compress_threadfn, &data[thr], "image_compress/%u", thr); if (IS_ERR(data[thr].thr)) { data[thr].thr = NULL; printk(KERN_ERR "PM: Cannot start compression threads "); ret = -ENOMEM; goto out_clean; } |
f996fc967 PM / Hibernate: C... |
606 |
} |
081a9d043 PM / Hibernate: I... |
607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 |
/* * Adjust number of free pages after all allocations have been done. * We don't want to run out of pages when writing. */ handle->nr_free_pages = nr_free_pages() >> 1; /* * Start the CRC32 thread. */ init_waitqueue_head(&crc->go); init_waitqueue_head(&crc->done); handle->crc32 = 0; crc->crc32 = &handle->crc32; for (thr = 0; thr < nr_threads; thr++) { crc->unc[thr] = data[thr].unc; crc->unc_len[thr] = &data[thr].unc_len; } crc->thr = kthread_run(crc32_threadfn, crc, "image_crc32"); if (IS_ERR(crc->thr)) { crc->thr = NULL; printk(KERN_ERR "PM: Cannot start CRC32 thread "); ret = -ENOMEM; goto out_clean; |
f996fc967 PM / Hibernate: C... |
633 634 635 |
} printk(KERN_INFO |
081a9d043 PM / Hibernate: I... |
636 637 |
"PM: Using %u thread(s) for compression. " |
f996fc967 PM / Hibernate: C... |
638 |
"PM: Compressing and saving image data (%u pages) ... ", |
081a9d043 PM / Hibernate: I... |
639 |
nr_threads, nr_to_write); |
f996fc967 PM / Hibernate: C... |
640 641 642 643 644 645 646 |
m = nr_to_write / 100; if (!m) m = 1; nr_pages = 0; bio = NULL; do_gettimeofday(&start); for (;;) { |
081a9d043 PM / Hibernate: I... |
647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 |
for (thr = 0; thr < nr_threads; thr++) { for (off = 0; off < LZO_UNC_SIZE; off += PAGE_SIZE) { ret = snapshot_read_next(snapshot); if (ret < 0) goto out_finish; if (!ret) break; memcpy(data[thr].unc + off, data_of(*snapshot), PAGE_SIZE); if (!(nr_pages % m)) printk(KERN_CONT "\b\b\b\b%3d%%", nr_pages / m); nr_pages++; } if (!off) |
f996fc967 PM / Hibernate: C... |
665 |
break; |
081a9d043 PM / Hibernate: I... |
666 |
data[thr].unc_len = off; |
f996fc967 PM / Hibernate: C... |
667 |
|
081a9d043 PM / Hibernate: I... |
668 669 |
atomic_set(&data[thr].ready, 1); wake_up(&data[thr].go); |
f996fc967 PM / Hibernate: C... |
670 |
} |
081a9d043 PM / Hibernate: I... |
671 |
if (!thr) |
f996fc967 PM / Hibernate: C... |
672 |
break; |
081a9d043 PM / Hibernate: I... |
673 674 675 |
crc->run_threads = thr; atomic_set(&crc->ready, 1); wake_up(&crc->go); |
f996fc967 PM / Hibernate: C... |
676 |
|
081a9d043 PM / Hibernate: I... |
677 678 679 680 |
for (run_threads = thr, thr = 0; thr < run_threads; thr++) { wait_event(data[thr].done, atomic_read(&data[thr].stop)); atomic_set(&data[thr].stop, 0); |
f996fc967 PM / Hibernate: C... |
681 |
|
081a9d043 PM / Hibernate: I... |
682 |
ret = data[thr].ret; |
f996fc967 PM / Hibernate: C... |
683 |
|
081a9d043 PM / Hibernate: I... |
684 685 686 687 688 |
if (ret < 0) { printk(KERN_ERR "PM: LZO compression failed "); goto out_finish; } |
f996fc967 PM / Hibernate: C... |
689 |
|
081a9d043 PM / Hibernate: I... |
690 691 692 693 694 695 696 |
if (unlikely(!data[thr].cmp_len || data[thr].cmp_len > lzo1x_worst_compress(data[thr].unc_len))) { printk(KERN_ERR "PM: Invalid LZO compressed length "); ret = -1; |
f996fc967 PM / Hibernate: C... |
697 |
goto out_finish; |
081a9d043 PM / Hibernate: I... |
698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 |
} *(size_t *)data[thr].cmp = data[thr].cmp_len; /* * Given we are writing one page at a time to disk, we * copy that much from the buffer, although the last * bit will likely be smaller than full page. This is * OK - we saved the length of the compressed data, so * any garbage at the end will be discarded when we * read it. */ for (off = 0; off < LZO_HEADER + data[thr].cmp_len; off += PAGE_SIZE) { memcpy(page, data[thr].cmp + off, PAGE_SIZE); ret = swap_write_page(handle, page, &bio); if (ret) goto out_finish; } |
f996fc967 PM / Hibernate: C... |
719 |
} |
081a9d043 PM / Hibernate: I... |
720 721 722 |
wait_event(crc->done, atomic_read(&crc->stop)); atomic_set(&crc->stop, 0); |
f996fc967 PM / Hibernate: C... |
723 724 725 726 727 728 729 |
} out_finish: err2 = hib_wait_on_bio_chain(&bio); do_gettimeofday(&stop); if (!ret) ret = err2; |
081a9d043 PM / Hibernate: I... |
730 |
if (!ret) { |
f996fc967 PM / Hibernate: C... |
731 732 |
printk(KERN_CONT "\b\b\b\bdone "); |
081a9d043 PM / Hibernate: I... |
733 |
} else { |
f996fc967 PM / Hibernate: C... |
734 735 |
printk(KERN_CONT " "); |
081a9d043 PM / Hibernate: I... |
736 |
} |
f996fc967 PM / Hibernate: C... |
737 |
swsusp_show_speed(&start, &stop, nr_to_write, "Wrote"); |
081a9d043 PM / Hibernate: I... |
738 739 740 741 742 743 744 745 746 747 748 749 750 |
out_clean: if (crc) { if (crc->thr) kthread_stop(crc->thr); kfree(crc); } if (data) { for (thr = 0; thr < nr_threads; thr++) if (data[thr].thr) kthread_stop(data[thr].thr); vfree(data); } if (page) free_page((unsigned long)page); |
f996fc967 PM / Hibernate: C... |
751 752 753 |
return ret; } |
61159a314 [PATCH] swsusp: s... |
754 755 756 757 758 759 |
/** * enough_swap - Make sure we have enough swap to save the image. * * Returns TRUE or FALSE after checking the total amount of swap * space avaiable from the resume partition. */ |
f996fc967 PM / Hibernate: C... |
760 |
static int enough_swap(unsigned int nr_pages, unsigned int flags) |
61159a314 [PATCH] swsusp: s... |
761 762 |
{ unsigned int free_swap = count_swap_pages(root_swap, 1); |
f996fc967 PM / Hibernate: C... |
763 |
unsigned int required; |
61159a314 [PATCH] swsusp: s... |
764 |
|
23976728a Hibernation: Upda... |
765 766 |
pr_debug("PM: Free swap pages: %u ", free_swap); |
f996fc967 PM / Hibernate: C... |
767 |
|
ee34a3704 PM / Hibernate: D... |
768 |
required = PAGES_FOR_IO + nr_pages; |
f996fc967 PM / Hibernate: C... |
769 |
return free_swap > required; |
61159a314 [PATCH] swsusp: s... |
770 771 772 773 |
} /** * swsusp_write - Write entire image and metadata. |
a634cc101 swsusp: introduce... |
774 |
* @flags: flags to pass to the "boot" kernel in the image header |
61159a314 [PATCH] swsusp: s... |
775 776 777 778 779 780 |
* * It is important _NOT_ to umount filesystems at this point. We want * them synced (in case something goes wrong) but we DO not want to mark * filesystem clean: it is not. (And it does not matter, if we resume * correctly, we'll mark system clean, anyway.) */ |
a634cc101 swsusp: introduce... |
781 |
int swsusp_write(unsigned int flags) |
61159a314 [PATCH] swsusp: s... |
782 783 784 785 |
{ struct swap_map_handle handle; struct snapshot_handle snapshot; struct swsusp_info *header; |
6f612af57 PM / Hibernate: G... |
786 |
unsigned long pages; |
61159a314 [PATCH] swsusp: s... |
787 |
int error; |
6f612af57 PM / Hibernate: G... |
788 789 |
pages = snapshot_get_image_size(); error = get_swap_writer(&handle); |
3aef83e0e [PATCH] swsusp: u... |
790 |
if (error) { |
6f612af57 PM / Hibernate: G... |
791 792 |
printk(KERN_ERR "PM: Cannot get swap writer "); |
61159a314 [PATCH] swsusp: s... |
793 794 |
return error; } |
ee34a3704 PM / Hibernate: D... |
795 796 797 798 799 800 801 |
if (flags & SF_NOCOMPRESS_MODE) { if (!enough_swap(pages, flags)) { printk(KERN_ERR "PM: Not enough free swap "); error = -ENOSPC; goto out_finish; } |
6f612af57 PM / Hibernate: G... |
802 |
} |
61159a314 [PATCH] swsusp: s... |
803 |
memset(&snapshot, 0, sizeof(struct snapshot_handle)); |
d3c1b24c5 PM / Hibernate: S... |
804 |
error = snapshot_read_next(&snapshot); |
3aef83e0e [PATCH] swsusp: u... |
805 806 807 |
if (error < PAGE_SIZE) { if (error >= 0) error = -EFAULT; |
6f612af57 PM / Hibernate: G... |
808 |
goto out_finish; |
3aef83e0e [PATCH] swsusp: u... |
809 |
} |
61159a314 [PATCH] swsusp: s... |
810 |
header = (struct swsusp_info *)data_of(snapshot); |
6f612af57 PM / Hibernate: G... |
811 |
error = swap_write_page(&handle, header, NULL); |
f996fc967 PM / Hibernate: C... |
812 813 814 815 816 |
if (!error) { error = (flags & SF_NOCOMPRESS_MODE) ? save_image(&handle, &snapshot, pages - 1) : save_image_lzo(&handle, &snapshot, pages - 1); } |
6f612af57 PM / Hibernate: G... |
817 818 |
out_finish: error = swap_writer_finish(&handle, flags, error); |
61159a314 [PATCH] swsusp: s... |
819 820 |
return error; } |
61159a314 [PATCH] swsusp: s... |
821 822 823 824 825 826 827 |
/** * The following functions allow us to read data using a swap map * in a file-alike way */ static void release_swap_reader(struct swap_map_handle *handle) { |
081a9d043 PM / Hibernate: I... |
828 829 830 831 832 833 834 835 836 |
struct swap_map_page_list *tmp; while (handle->maps) { if (handle->maps->map) free_page((unsigned long)handle->maps->map); tmp = handle->maps; handle->maps = handle->maps->next; kfree(tmp); } |
61159a314 [PATCH] swsusp: s... |
837 838 |
handle->cur = NULL; } |
6f612af57 PM / Hibernate: G... |
839 840 |
static int get_swap_reader(struct swap_map_handle *handle, unsigned int *flags_p) |
61159a314 [PATCH] swsusp: s... |
841 842 |
{ int error; |
081a9d043 PM / Hibernate: I... |
843 844 |
struct swap_map_page_list *tmp, *last; sector_t offset; |
61159a314 [PATCH] swsusp: s... |
845 |
|
6f612af57 PM / Hibernate: G... |
846 847 848 |
*flags_p = swsusp_header->flags; if (!swsusp_header->image) /* how can this happen? */ |
61159a314 [PATCH] swsusp: s... |
849 |
return -EINVAL; |
3aef83e0e [PATCH] swsusp: u... |
850 |
|
081a9d043 PM / Hibernate: I... |
851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 |
handle->cur = NULL; last = handle->maps = NULL; offset = swsusp_header->image; while (offset) { tmp = kmalloc(sizeof(*handle->maps), GFP_KERNEL); if (!tmp) { release_swap_reader(handle); return -ENOMEM; } memset(tmp, 0, sizeof(*tmp)); if (!handle->maps) handle->maps = tmp; if (last) last->next = tmp; last = tmp; tmp->map = (struct swap_map_page *) __get_free_page(__GFP_WAIT | __GFP_HIGH); if (!tmp->map) { release_swap_reader(handle); return -ENOMEM; } |
3aef83e0e [PATCH] swsusp: u... |
873 |
|
081a9d043 PM / Hibernate: I... |
874 875 876 877 878 879 |
error = hib_bio_read_page(offset, tmp->map, NULL); if (error) { release_swap_reader(handle); return error; } offset = tmp->map->next_swap; |
61159a314 [PATCH] swsusp: s... |
880 881 |
} handle->k = 0; |
081a9d043 PM / Hibernate: I... |
882 |
handle->cur = handle->maps->map; |
61159a314 [PATCH] swsusp: s... |
883 884 |
return 0; } |
546e0d271 [PATCH] swsusp: r... |
885 886 |
static int swap_read_page(struct swap_map_handle *handle, void *buf, struct bio **bio_chain) |
61159a314 [PATCH] swsusp: s... |
887 |
{ |
3aef83e0e [PATCH] swsusp: u... |
888 |
sector_t offset; |
61159a314 [PATCH] swsusp: s... |
889 |
int error; |
081a9d043 PM / Hibernate: I... |
890 |
struct swap_map_page_list *tmp; |
61159a314 [PATCH] swsusp: s... |
891 892 893 894 895 896 |
if (!handle->cur) return -EINVAL; offset = handle->cur->entries[handle->k]; if (!offset) return -EFAULT; |
8a0d613fa PM / Hibernate: S... |
897 |
error = hib_bio_read_page(offset, buf, bio_chain); |
61159a314 [PATCH] swsusp: s... |
898 899 900 901 |
if (error) return error; if (++handle->k >= MAP_PAGE_ENTRIES) { handle->k = 0; |
081a9d043 PM / Hibernate: I... |
902 903 904 905 906 |
free_page((unsigned long)handle->maps->map); tmp = handle->maps; handle->maps = handle->maps->next; kfree(tmp); if (!handle->maps) |
61159a314 [PATCH] swsusp: s... |
907 |
release_swap_reader(handle); |
081a9d043 PM / Hibernate: I... |
908 909 |
else handle->cur = handle->maps->map; |
61159a314 [PATCH] swsusp: s... |
910 911 912 |
} return error; } |
6f612af57 PM / Hibernate: G... |
913 914 915 916 917 918 |
static int swap_reader_finish(struct swap_map_handle *handle) { release_swap_reader(handle); return 0; } |
61159a314 [PATCH] swsusp: s... |
919 920 921 922 923 924 925 926 |
/** * load_image - load the image using the swap map handle * @handle and the snapshot handle @snapshot * (assume there are @nr_pages pages to load) */ static int load_image(struct swap_map_handle *handle, struct snapshot_handle *snapshot, |
546e0d271 [PATCH] swsusp: r... |
927 |
unsigned int nr_to_read) |
61159a314 [PATCH] swsusp: s... |
928 929 |
{ unsigned int m; |
081a9d043 PM / Hibernate: I... |
930 |
int ret = 0; |
8c002494b [PATCH] swsusp: a... |
931 932 |
struct timeval start; struct timeval stop; |
546e0d271 [PATCH] swsusp: r... |
933 934 935 |
struct bio *bio; int err2; unsigned nr_pages; |
61159a314 [PATCH] swsusp: s... |
936 |
|
23976728a Hibernation: Upda... |
937 938 |
printk(KERN_INFO "PM: Loading image data pages (%u pages) ... ", nr_to_read); |
546e0d271 [PATCH] swsusp: r... |
939 |
m = nr_to_read / 100; |
61159a314 [PATCH] swsusp: s... |
940 941 942 |
if (!m) m = 1; nr_pages = 0; |
546e0d271 [PATCH] swsusp: r... |
943 |
bio = NULL; |
8c002494b [PATCH] swsusp: a... |
944 |
do_gettimeofday(&start); |
546e0d271 [PATCH] swsusp: r... |
945 |
for ( ; ; ) { |
081a9d043 PM / Hibernate: I... |
946 947 |
ret = snapshot_write_next(snapshot); if (ret <= 0) |
546e0d271 [PATCH] swsusp: r... |
948 |
break; |
081a9d043 PM / Hibernate: I... |
949 950 |
ret = swap_read_page(handle, data_of(*snapshot), &bio); if (ret) |
546e0d271 [PATCH] swsusp: r... |
951 952 |
break; if (snapshot->sync_read) |
081a9d043 PM / Hibernate: I... |
953 954 |
ret = hib_wait_on_bio_chain(&bio); if (ret) |
546e0d271 [PATCH] swsusp: r... |
955 956 957 958 959 |
break; if (!(nr_pages % m)) printk("\b\b\b\b%3d%%", nr_pages / m); nr_pages++; } |
8a0d613fa PM / Hibernate: S... |
960 |
err2 = hib_wait_on_bio_chain(&bio); |
8c002494b [PATCH] swsusp: a... |
961 |
do_gettimeofday(&stop); |
081a9d043 PM / Hibernate: I... |
962 963 964 |
if (!ret) ret = err2; if (!ret) { |
61159a314 [PATCH] swsusp: s... |
965 966 |
printk("\b\b\b\bdone "); |
8357376d3 [PATCH] swsusp: I... |
967 |
snapshot_write_finalize(snapshot); |
e655a250d [PATCH] swswsup: ... |
968 |
if (!snapshot_image_loaded(snapshot)) |
081a9d043 PM / Hibernate: I... |
969 |
ret = -ENODATA; |
bf9fd67a0 PM / Hibernate: A... |
970 971 972 |
} else printk(" "); |
0d3a9abe8 [PATCH] swsusp: M... |
973 |
swsusp_show_speed(&start, &stop, nr_to_read, "Read"); |
081a9d043 PM / Hibernate: I... |
974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 |
return ret; } /** * Structure used for LZO data decompression. */ struct dec_data { struct task_struct *thr; /* thread */ atomic_t ready; /* ready to start flag */ atomic_t stop; /* ready to stop flag */ int ret; /* return code */ wait_queue_head_t go; /* start decompression */ wait_queue_head_t done; /* decompression done */ size_t unc_len; /* uncompressed length */ size_t cmp_len; /* compressed length */ unsigned char unc[LZO_UNC_SIZE]; /* uncompressed buffer */ unsigned char cmp[LZO_CMP_SIZE]; /* compressed buffer */ }; /** * Deompression function that runs in its own thread. */ static int lzo_decompress_threadfn(void *data) { struct dec_data *d = data; while (1) { wait_event(d->go, atomic_read(&d->ready) || kthread_should_stop()); if (kthread_should_stop()) { d->thr = NULL; d->ret = -1; atomic_set(&d->stop, 1); wake_up(&d->done); break; } atomic_set(&d->ready, 0); d->unc_len = LZO_UNC_SIZE; d->ret = lzo1x_decompress_safe(d->cmp + LZO_HEADER, d->cmp_len, d->unc, &d->unc_len); atomic_set(&d->stop, 1); wake_up(&d->done); } return 0; |
61159a314 [PATCH] swsusp: s... |
1019 |
} |
a634cc101 swsusp: introduce... |
1020 |
/** |
f996fc967 PM / Hibernate: C... |
1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 |
* load_image_lzo - Load compressed image data and decompress them with LZO. * @handle: Swap map handle to use for loading data. * @snapshot: Image to copy uncompressed data into. * @nr_to_read: Number of pages to load. */ static int load_image_lzo(struct swap_map_handle *handle, struct snapshot_handle *snapshot, unsigned int nr_to_read) { unsigned int m; |
081a9d043 PM / Hibernate: I... |
1031 1032 |
int ret = 0; int eof = 0; |
9f339caf8 PM / Hibernate: U... |
1033 |
struct bio *bio; |
f996fc967 PM / Hibernate: C... |
1034 1035 1036 |
struct timeval start; struct timeval stop; unsigned nr_pages; |
081a9d043 PM / Hibernate: I... |
1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 |
size_t off; unsigned i, thr, run_threads, nr_threads; unsigned ring = 0, pg = 0, ring_size = 0, have = 0, want, need, asked = 0; unsigned long read_pages; unsigned char **page = NULL; struct dec_data *data = NULL; struct crc_data *crc = NULL; /* * We'll limit the number of threads for decompression to limit memory * footprint. */ nr_threads = num_online_cpus() - 1; nr_threads = clamp_val(nr_threads, 1, LZO_THREADS); page = vmalloc(sizeof(*page) * LZO_READ_PAGES); if (!page) { printk(KERN_ERR "PM: Failed to allocate LZO page "); ret = -ENOMEM; goto out_clean; } |
9f339caf8 PM / Hibernate: U... |
1060 |
|
081a9d043 PM / Hibernate: I... |
1061 1062 1063 1064 1065 1066 1067 1068 1069 |
data = vmalloc(sizeof(*data) * nr_threads); if (!data) { printk(KERN_ERR "PM: Failed to allocate LZO data "); ret = -ENOMEM; goto out_clean; } for (thr = 0; thr < nr_threads; thr++) memset(&data[thr], 0, offsetof(struct dec_data, go)); |
9f339caf8 PM / Hibernate: U... |
1070 |
|
081a9d043 PM / Hibernate: I... |
1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 |
crc = kmalloc(sizeof(*crc), GFP_KERNEL); if (!crc) { printk(KERN_ERR "PM: Failed to allocate crc "); ret = -ENOMEM; goto out_clean; } memset(crc, 0, offsetof(struct crc_data, go)); /* * Start the decompression threads. */ for (thr = 0; thr < nr_threads; thr++) { init_waitqueue_head(&data[thr].go); init_waitqueue_head(&data[thr].done); data[thr].thr = kthread_run(lzo_decompress_threadfn, &data[thr], "image_decompress/%u", thr); if (IS_ERR(data[thr].thr)) { data[thr].thr = NULL; printk(KERN_ERR "PM: Cannot start decompression threads "); ret = -ENOMEM; goto out_clean; |
9f339caf8 PM / Hibernate: U... |
1097 |
} |
f996fc967 PM / Hibernate: C... |
1098 |
} |
081a9d043 PM / Hibernate: I... |
1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 |
/* * Start the CRC32 thread. */ init_waitqueue_head(&crc->go); init_waitqueue_head(&crc->done); handle->crc32 = 0; crc->crc32 = &handle->crc32; for (thr = 0; thr < nr_threads; thr++) { crc->unc[thr] = data[thr].unc; crc->unc_len[thr] = &data[thr].unc_len; |
f996fc967 PM / Hibernate: C... |
1110 |
} |
081a9d043 PM / Hibernate: I... |
1111 1112 1113 1114 1115 1116 1117 1118 |
crc->thr = kthread_run(crc32_threadfn, crc, "image_crc32"); if (IS_ERR(crc->thr)) { crc->thr = NULL; printk(KERN_ERR "PM: Cannot start CRC32 thread "); ret = -ENOMEM; goto out_clean; } |
9f339caf8 PM / Hibernate: U... |
1119 |
|
081a9d043 PM / Hibernate: I... |
1120 1121 1122 1123 1124 |
/* * Adjust number of pages for read buffering, in case we are short. */ read_pages = (nr_free_pages() - snapshot_get_image_size()) >> 1; read_pages = clamp_val(read_pages, LZO_CMP_PAGES, LZO_READ_PAGES); |
9f339caf8 PM / Hibernate: U... |
1125 |
|
081a9d043 PM / Hibernate: I... |
1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 |
for (i = 0; i < read_pages; i++) { page[i] = (void *)__get_free_page(i < LZO_CMP_PAGES ? __GFP_WAIT | __GFP_HIGH : __GFP_WAIT); if (!page[i]) { if (i < LZO_CMP_PAGES) { ring_size = i; printk(KERN_ERR "PM: Failed to allocate LZO pages "); ret = -ENOMEM; goto out_clean; } else { break; } } |
f996fc967 PM / Hibernate: C... |
1142 |
} |
081a9d043 PM / Hibernate: I... |
1143 |
want = ring_size = i; |
f996fc967 PM / Hibernate: C... |
1144 1145 |
printk(KERN_INFO |
081a9d043 PM / Hibernate: I... |
1146 1147 |
"PM: Using %u thread(s) for decompression. " |
f996fc967 PM / Hibernate: C... |
1148 |
"PM: Loading and decompressing image data (%u pages) ... ", |
081a9d043 PM / Hibernate: I... |
1149 |
nr_threads, nr_to_read); |
f996fc967 PM / Hibernate: C... |
1150 1151 1152 1153 |
m = nr_to_read / 100; if (!m) m = 1; nr_pages = 0; |
9f339caf8 PM / Hibernate: U... |
1154 |
bio = NULL; |
f996fc967 PM / Hibernate: C... |
1155 |
do_gettimeofday(&start); |
081a9d043 PM / Hibernate: I... |
1156 1157 |
ret = snapshot_write_next(snapshot); if (ret <= 0) |
f996fc967 PM / Hibernate: C... |
1158 |
goto out_finish; |
081a9d043 PM / Hibernate: I... |
1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 |
for(;;) { for (i = 0; !eof && i < want; i++) { ret = swap_read_page(handle, page[ring], &bio); if (ret) { /* * On real read error, finish. On end of data, * set EOF flag and just exit the read loop. */ if (handle->cur && handle->cur->entries[handle->k]) { goto out_finish; } else { eof = 1; break; } } if (++ring >= ring_size) ring = 0; |
f996fc967 PM / Hibernate: C... |
1177 |
} |
081a9d043 PM / Hibernate: I... |
1178 1179 |
asked += i; want -= i; |
f996fc967 PM / Hibernate: C... |
1180 |
|
081a9d043 PM / Hibernate: I... |
1181 1182 1183 1184 1185 1186 1187 1188 1189 |
/* * We are out of data, wait for some more. */ if (!have) { if (!asked) break; ret = hib_wait_on_bio_chain(&bio); if (ret) |
f996fc967 PM / Hibernate: C... |
1190 |
goto out_finish; |
081a9d043 PM / Hibernate: I... |
1191 1192 1193 1194 |
have += asked; asked = 0; if (eof) eof = 2; |
9f339caf8 PM / Hibernate: U... |
1195 |
} |
f996fc967 PM / Hibernate: C... |
1196 |
|
081a9d043 PM / Hibernate: I... |
1197 1198 1199 1200 |
if (crc->run_threads) { wait_event(crc->done, atomic_read(&crc->stop)); atomic_set(&crc->stop, 0); crc->run_threads = 0; |
f996fc967 PM / Hibernate: C... |
1201 |
} |
081a9d043 PM / Hibernate: I... |
1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 |
for (thr = 0; have && thr < nr_threads; thr++) { data[thr].cmp_len = *(size_t *)page[pg]; if (unlikely(!data[thr].cmp_len || data[thr].cmp_len > lzo1x_worst_compress(LZO_UNC_SIZE))) { printk(KERN_ERR "PM: Invalid LZO compressed length "); ret = -1; goto out_finish; } need = DIV_ROUND_UP(data[thr].cmp_len + LZO_HEADER, PAGE_SIZE); if (need > have) { if (eof > 1) { ret = -1; goto out_finish; } break; } for (off = 0; off < LZO_HEADER + data[thr].cmp_len; off += PAGE_SIZE) { memcpy(data[thr].cmp + off, page[pg], PAGE_SIZE); have--; want++; if (++pg >= ring_size) pg = 0; } atomic_set(&data[thr].ready, 1); wake_up(&data[thr].go); |
f996fc967 PM / Hibernate: C... |
1237 |
} |
081a9d043 PM / Hibernate: I... |
1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 |
/* * Wait for more data while we are decompressing. */ if (have < LZO_CMP_PAGES && asked) { ret = hib_wait_on_bio_chain(&bio); if (ret) goto out_finish; have += asked; asked = 0; if (eof) eof = 2; |
f996fc967 PM / Hibernate: C... |
1249 |
} |
081a9d043 PM / Hibernate: I... |
1250 1251 1252 1253 1254 1255 |
for (run_threads = thr, thr = 0; thr < run_threads; thr++) { wait_event(data[thr].done, atomic_read(&data[thr].stop)); atomic_set(&data[thr].stop, 0); ret = data[thr].ret; |
f996fc967 PM / Hibernate: C... |
1256 |
|
081a9d043 PM / Hibernate: I... |
1257 1258 1259 1260 1261 1262 |
if (ret < 0) { printk(KERN_ERR "PM: LZO decompression failed "); goto out_finish; } |
f996fc967 PM / Hibernate: C... |
1263 |
|
081a9d043 PM / Hibernate: I... |
1264 1265 1266 1267 1268 1269 1270 |
if (unlikely(!data[thr].unc_len || data[thr].unc_len > LZO_UNC_SIZE || data[thr].unc_len & (PAGE_SIZE - 1))) { printk(KERN_ERR "PM: Invalid LZO uncompressed length "); ret = -1; |
f996fc967 PM / Hibernate: C... |
1271 |
goto out_finish; |
081a9d043 PM / Hibernate: I... |
1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 |
} for (off = 0; off < data[thr].unc_len; off += PAGE_SIZE) { memcpy(data_of(*snapshot), data[thr].unc + off, PAGE_SIZE); if (!(nr_pages % m)) printk("\b\b\b\b%3d%%", nr_pages / m); nr_pages++; ret = snapshot_write_next(snapshot); if (ret <= 0) { crc->run_threads = thr + 1; atomic_set(&crc->ready, 1); wake_up(&crc->go); goto out_finish; } } |
f996fc967 PM / Hibernate: C... |
1291 |
} |
081a9d043 PM / Hibernate: I... |
1292 1293 1294 1295 |
crc->run_threads = thr; atomic_set(&crc->ready, 1); wake_up(&crc->go); |
f996fc967 PM / Hibernate: C... |
1296 1297 1298 |
} out_finish: |
081a9d043 PM / Hibernate: I... |
1299 1300 1301 1302 |
if (crc->run_threads) { wait_event(crc->done, atomic_read(&crc->stop)); atomic_set(&crc->stop, 0); } |
f996fc967 PM / Hibernate: C... |
1303 |
do_gettimeofday(&stop); |
081a9d043 PM / Hibernate: I... |
1304 |
if (!ret) { |
f996fc967 PM / Hibernate: C... |
1305 1306 1307 1308 |
printk("\b\b\b\bdone "); snapshot_write_finalize(snapshot); if (!snapshot_image_loaded(snapshot)) |
081a9d043 PM / Hibernate: I... |
1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 |
ret = -ENODATA; if (!ret) { if (swsusp_header->flags & SF_CRC32_MODE) { if(handle->crc32 != swsusp_header->crc32) { printk(KERN_ERR "PM: Invalid image CRC32! "); ret = -ENODATA; } } } |
f996fc967 PM / Hibernate: C... |
1320 1321 1322 1323 |
} else printk(" "); swsusp_show_speed(&start, &stop, nr_to_read, "Read"); |
081a9d043 PM / Hibernate: I... |
1324 1325 |
out_clean: for (i = 0; i < ring_size; i++) |
9f339caf8 PM / Hibernate: U... |
1326 |
free_page((unsigned long)page[i]); |
081a9d043 PM / Hibernate: I... |
1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 |
if (crc) { if (crc->thr) kthread_stop(crc->thr); kfree(crc); } if (data) { for (thr = 0; thr < nr_threads; thr++) if (data[thr].thr) kthread_stop(data[thr].thr); vfree(data); } if (page) vfree(page); |
f996fc967 PM / Hibernate: C... |
1339 |
|
081a9d043 PM / Hibernate: I... |
1340 |
return ret; |
f996fc967 PM / Hibernate: C... |
1341 1342 1343 |
} /** |
a634cc101 swsusp: introduce... |
1344 1345 |
* swsusp_read - read the hibernation image. * @flags_p: flags passed by the "frozen" kernel in the image header should |
b595076a1 tree-wide: fix co... |
1346 |
* be written into this memory location |
a634cc101 swsusp: introduce... |
1347 1348 1349 |
*/ int swsusp_read(unsigned int *flags_p) |
61159a314 [PATCH] swsusp: s... |
1350 1351 1352 1353 1354 |
{ int error; struct swap_map_handle handle; struct snapshot_handle snapshot; struct swsusp_info *header; |
61159a314 [PATCH] swsusp: s... |
1355 |
memset(&snapshot, 0, sizeof(struct snapshot_handle)); |
d3c1b24c5 PM / Hibernate: S... |
1356 |
error = snapshot_write_next(&snapshot); |
61159a314 [PATCH] swsusp: s... |
1357 1358 1359 |
if (error < PAGE_SIZE) return error < 0 ? error : -EFAULT; header = (struct swsusp_info *)data_of(snapshot); |
6f612af57 PM / Hibernate: G... |
1360 1361 1362 |
error = get_swap_reader(&handle, flags_p); if (error) goto end; |
61159a314 [PATCH] swsusp: s... |
1363 |
if (!error) |
546e0d271 [PATCH] swsusp: r... |
1364 |
error = swap_read_page(&handle, header, NULL); |
f996fc967 PM / Hibernate: C... |
1365 1366 1367 1368 1369 |
if (!error) { error = (*flags_p & SF_NOCOMPRESS_MODE) ? load_image(&handle, &snapshot, header->pages - 1) : load_image_lzo(&handle, &snapshot, header->pages - 1); } |
6f612af57 PM / Hibernate: G... |
1370 1371 |
swap_reader_finish(&handle); end: |
61159a314 [PATCH] swsusp: s... |
1372 |
if (!error) |
23976728a Hibernation: Upda... |
1373 1374 |
pr_debug("PM: Image successfully loaded "); |
61159a314 [PATCH] swsusp: s... |
1375 |
else |
23976728a Hibernation: Upda... |
1376 1377 |
pr_debug("PM: Error %d resuming ", error); |
61159a314 [PATCH] swsusp: s... |
1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 |
return error; } /** * swsusp_check - Check for swsusp signature in the resume device */ int swsusp_check(void) { int error; |
d4d776299 block: clean up b... |
1388 1389 |
hib_resume_bdev = blkdev_get_by_dev(swsusp_resume_device, FMODE_READ, NULL); |
8a0d613fa PM / Hibernate: S... |
1390 1391 |
if (!IS_ERR(hib_resume_bdev)) { set_blocksize(hib_resume_bdev, PAGE_SIZE); |
3ecb01df3 use clear_page()/... |
1392 |
clear_page(swsusp_header); |
8a0d613fa PM / Hibernate: S... |
1393 |
error = hib_bio_read_page(swsusp_resume_block, |
1b29c1643 [PATCH] x86-64: d... |
1394 |
swsusp_header, NULL); |
9a154d9d9 [PATCH] swsusp: a... |
1395 |
if (error) |
76b57e613 PM / Hibernate: F... |
1396 |
goto put; |
9a154d9d9 [PATCH] swsusp: a... |
1397 |
|
3624eb04c PM / Hibernate: M... |
1398 |
if (!memcmp(HIBERNATE_SIG, swsusp_header->sig, 10)) { |
1b29c1643 [PATCH] x86-64: d... |
1399 |
memcpy(swsusp_header->sig, swsusp_header->orig_sig, 10); |
61159a314 [PATCH] swsusp: s... |
1400 |
/* Reset swap signature now */ |
8a0d613fa PM / Hibernate: S... |
1401 |
error = hib_bio_write_page(swsusp_resume_block, |
1b29c1643 [PATCH] x86-64: d... |
1402 |
swsusp_header, NULL); |
61159a314 [PATCH] swsusp: s... |
1403 |
} else { |
76b57e613 PM / Hibernate: F... |
1404 |
error = -EINVAL; |
61159a314 [PATCH] swsusp: s... |
1405 |
} |
76b57e613 PM / Hibernate: F... |
1406 1407 |
put: |
61159a314 [PATCH] swsusp: s... |
1408 |
if (error) |
8a0d613fa PM / Hibernate: S... |
1409 |
blkdev_put(hib_resume_bdev, FMODE_READ); |
61159a314 [PATCH] swsusp: s... |
1410 |
else |
d0941ead3 PM / Hibernate: M... |
1411 1412 |
pr_debug("PM: Image signature found, resuming "); |
61159a314 [PATCH] swsusp: s... |
1413 |
} else { |
8a0d613fa PM / Hibernate: S... |
1414 |
error = PTR_ERR(hib_resume_bdev); |
61159a314 [PATCH] swsusp: s... |
1415 1416 1417 |
} if (error) |
d0941ead3 PM / Hibernate: M... |
1418 1419 |
pr_debug("PM: Image not found (code %d) ", error); |
61159a314 [PATCH] swsusp: s... |
1420 1421 1422 1423 1424 1425 1426 |
return error; } /** * swsusp_close - close swap device. */ |
c2dd0dae1 [PATCH] propagate... |
1427 |
void swsusp_close(fmode_t mode) |
61159a314 [PATCH] swsusp: s... |
1428 |
{ |
8a0d613fa PM / Hibernate: S... |
1429 |
if (IS_ERR(hib_resume_bdev)) { |
23976728a Hibernation: Upda... |
1430 1431 |
pr_debug("PM: Image device not initialised "); |
61159a314 [PATCH] swsusp: s... |
1432 1433 |
return; } |
8a0d613fa PM / Hibernate: S... |
1434 |
blkdev_put(hib_resume_bdev, mode); |
61159a314 [PATCH] swsusp: s... |
1435 |
} |
1b29c1643 [PATCH] x86-64: d... |
1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 |
static int swsusp_header_init(void) { swsusp_header = (struct swsusp_header*) __get_free_page(GFP_KERNEL); if (!swsusp_header) panic("Could not allocate memory for swsusp_header "); return 0; } core_initcall(swsusp_header_init); |