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@ -39,7 +39,7 @@ struct pbe *restore_pblist;
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static unsigned int nr_copy_pages;
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static unsigned int nr_meta_pages;
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static unsigned long *buffer;
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static void *buffer;
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#ifdef CONFIG_HIGHMEM
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unsigned int count_highmem_pages(void)
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@ -172,7 +172,7 @@ static inline int restore_highmem(void) {return 0;}
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#define PG_UNSAFE_CLEAR 1
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#define PG_UNSAFE_KEEP 0
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static unsigned int unsafe_pages;
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static unsigned int allocated_unsafe_pages;
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static void *alloc_image_page(gfp_t gfp_mask, int safe_needed)
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{
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@ -183,7 +183,7 @@ static void *alloc_image_page(gfp_t gfp_mask, int safe_needed)
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while (res && PageNosaveFree(virt_to_page(res))) {
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/* The page is unsafe, mark it for swsusp_free() */
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SetPageNosave(virt_to_page(res));
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unsafe_pages++;
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allocated_unsafe_pages++;
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res = (void *)get_zeroed_page(gfp_mask);
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}
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if (res) {
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@ -772,101 +772,10 @@ copy_data_pages(struct memory_bitmap *copy_bm, struct memory_bitmap *orig_bm)
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}
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/**
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* free_pagedir - free pages allocated with alloc_pagedir()
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*/
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static void free_pagedir(struct pbe *pblist, int clear_nosave_free)
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{
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struct pbe *pbe;
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while (pblist) {
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pbe = (pblist + PB_PAGE_SKIP)->next;
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free_image_page(pblist, clear_nosave_free);
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pblist = pbe;
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}
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}
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/**
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* fill_pb_page - Create a list of PBEs on a given memory page
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*/
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static inline void fill_pb_page(struct pbe *pbpage, unsigned int n)
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{
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struct pbe *p;
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p = pbpage;
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pbpage += n - 1;
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do
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p->next = p + 1;
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while (++p < pbpage);
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}
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/**
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* create_pbe_list - Create a list of PBEs on top of a given chain
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* of memory pages allocated with alloc_pagedir()
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* swsusp_free - free pages allocated for the suspend.
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*
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* This function assumes that pages allocated by alloc_image_page() will
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* always be zeroed.
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*/
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static inline void create_pbe_list(struct pbe *pblist, unsigned int nr_pages)
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{
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struct pbe *pbpage;
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unsigned int num = PBES_PER_PAGE;
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for_each_pb_page (pbpage, pblist) {
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if (num >= nr_pages)
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break;
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fill_pb_page(pbpage, PBES_PER_PAGE);
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num += PBES_PER_PAGE;
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}
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if (pbpage) {
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num -= PBES_PER_PAGE;
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fill_pb_page(pbpage, nr_pages - num);
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}
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}
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/**
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* alloc_pagedir - Allocate the page directory.
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*
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* First, determine exactly how many pages we need and
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* allocate them.
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*
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* We arrange the pages in a chain: each page is an array of PBES_PER_PAGE
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* struct pbe elements (pbes) and the last element in the page points
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* to the next page.
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*
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* On each page we set up a list of struct_pbe elements.
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*/
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static struct pbe *alloc_pagedir(unsigned int nr_pages, gfp_t gfp_mask,
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int safe_needed)
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{
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unsigned int num;
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struct pbe *pblist, *pbe;
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if (!nr_pages)
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return NULL;
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pblist = alloc_image_page(gfp_mask, safe_needed);
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pbe = pblist;
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for (num = PBES_PER_PAGE; num < nr_pages; num += PBES_PER_PAGE) {
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if (!pbe) {
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free_pagedir(pblist, PG_UNSAFE_CLEAR);
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return NULL;
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}
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pbe += PB_PAGE_SKIP;
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pbe->next = alloc_image_page(gfp_mask, safe_needed);
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pbe = pbe->next;
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}
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create_pbe_list(pblist, nr_pages);
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return pblist;
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}
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/**
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* Free pages we allocated for suspend. Suspend pages are alocated
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* before atomic copy, so we need to free them after resume.
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* Suspend pages are alocated before the atomic copy is made, so we
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* need to release them after the resume.
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*/
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void swsusp_free(void)
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@ -904,14 +813,18 @@ void swsusp_free(void)
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static int enough_free_mem(unsigned int nr_pages)
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{
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struct zone *zone;
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unsigned int n = 0;
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unsigned int free = 0, meta = 0;
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for_each_zone (zone)
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if (!is_highmem(zone))
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n += zone->free_pages;
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pr_debug("swsusp: available memory: %u pages\n", n);
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return n > (nr_pages + PAGES_FOR_IO +
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(nr_pages + PBES_PER_PAGE - 1) / PBES_PER_PAGE);
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if (!is_highmem(zone)) {
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free += zone->free_pages;
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meta += snapshot_additional_pages(zone);
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}
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pr_debug("swsusp: pages needed: %u + %u + %u, available pages: %u\n",
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nr_pages, PAGES_FOR_IO, meta, free);
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return free > nr_pages + PAGES_FOR_IO + meta;
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}
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static int
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@ -961,11 +874,6 @@ asmlinkage int swsusp_save(void)
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nr_pages = count_data_pages();
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printk("swsusp: Need to copy %u pages\n", nr_pages);
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pr_debug("swsusp: pages needed: %u + %lu + %u, free: %u\n",
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nr_pages,
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(nr_pages + PBES_PER_PAGE - 1) / PBES_PER_PAGE,
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PAGES_FOR_IO, nr_free_pages());
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if (!enough_free_mem(nr_pages)) {
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printk(KERN_ERR "swsusp: Not enough free memory\n");
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return -ENOMEM;
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@ -1007,22 +915,19 @@ static void init_header(struct swsusp_info *info)
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}
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/**
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* pack_addresses - the addresses corresponding to pfns found in the
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* bitmap @bm are stored in the array @buf[] (1 page)
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* pack_pfns - pfns corresponding to the set bits found in the bitmap @bm
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* are stored in the array @buf[] (1 page at a time)
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*/
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static inline void
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pack_addresses(unsigned long *buf, struct memory_bitmap *bm)
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pack_pfns(unsigned long *buf, struct memory_bitmap *bm)
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{
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int j;
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for (j = 0; j < PAGE_SIZE / sizeof(long); j++) {
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unsigned long pfn = memory_bm_next_pfn(bm);
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if (unlikely(pfn == BM_END_OF_MAP))
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buf[j] = memory_bm_next_pfn(bm);
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if (unlikely(buf[j] == BM_END_OF_MAP))
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break;
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buf[j] = (unsigned long)page_address(pfn_to_page(pfn));
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}
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}
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@ -1068,7 +973,7 @@ int snapshot_read_next(struct snapshot_handle *handle, size_t count)
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if (handle->prev < handle->cur) {
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if (handle->cur <= nr_meta_pages) {
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memset(buffer, 0, PAGE_SIZE);
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pack_addresses(buffer, &orig_bm);
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pack_pfns(buffer, &orig_bm);
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} else {
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unsigned long pfn = memory_bm_next_pfn(©_bm);
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@ -1094,14 +999,10 @@ int snapshot_read_next(struct snapshot_handle *handle, size_t count)
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* had been used before suspend
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*/
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static int mark_unsafe_pages(struct pbe *pblist)
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static int mark_unsafe_pages(struct memory_bitmap *bm)
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{
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struct zone *zone;
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unsigned long pfn, max_zone_pfn;
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struct pbe *p;
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if (!pblist) /* a sanity check */
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return -EINVAL;
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/* Clear page flags */
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for_each_zone (zone) {
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@ -1111,30 +1012,37 @@ static int mark_unsafe_pages(struct pbe *pblist)
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ClearPageNosaveFree(pfn_to_page(pfn));
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}
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/* Mark orig addresses */
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for_each_pbe (p, pblist) {
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if (virt_addr_valid(p->orig_address))
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SetPageNosaveFree(virt_to_page(p->orig_address));
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else
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return -EFAULT;
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}
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/* Mark pages that correspond to the "original" pfns as "unsafe" */
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memory_bm_position_reset(bm);
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do {
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pfn = memory_bm_next_pfn(bm);
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if (likely(pfn != BM_END_OF_MAP)) {
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if (likely(pfn_valid(pfn)))
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SetPageNosaveFree(pfn_to_page(pfn));
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else
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return -EFAULT;
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}
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} while (pfn != BM_END_OF_MAP);
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unsafe_pages = 0;
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allocated_unsafe_pages = 0;
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return 0;
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}
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static void copy_page_backup_list(struct pbe *dst, struct pbe *src)
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static void
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duplicate_memory_bitmap(struct memory_bitmap *dst, struct memory_bitmap *src)
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{
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/* We assume both lists contain the same number of elements */
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while (src) {
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dst->orig_address = src->orig_address;
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dst = dst->next;
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src = src->next;
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unsigned long pfn;
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memory_bm_position_reset(src);
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pfn = memory_bm_next_pfn(src);
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while (pfn != BM_END_OF_MAP) {
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memory_bm_set_bit(dst, pfn);
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pfn = memory_bm_next_pfn(src);
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}
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}
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static int check_header(struct swsusp_info *info)
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static inline int check_header(struct swsusp_info *info)
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{
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char *reason = NULL;
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@ -1161,19 +1069,14 @@ static int check_header(struct swsusp_info *info)
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* load header - check the image header and copy data from it
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*/
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static int load_header(struct snapshot_handle *handle,
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struct swsusp_info *info)
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static int
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load_header(struct swsusp_info *info)
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{
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int error;
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struct pbe *pblist;
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restore_pblist = NULL;
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error = check_header(info);
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if (!error) {
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pblist = alloc_pagedir(info->image_pages, GFP_ATOMIC, PG_ANY);
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if (!pblist)
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return -ENOMEM;
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restore_pblist = pblist;
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handle->pbe = pblist;
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nr_copy_pages = info->image_pages;
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nr_meta_pages = info->pages - info->image_pages - 1;
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}
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@ -1181,108 +1084,137 @@ static int load_header(struct snapshot_handle *handle,
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}
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/**
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* unpack_orig_addresses - copy the elements of @buf[] (1 page) to
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* the PBEs in the list starting at @pbe
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* unpack_orig_pfns - for each element of @buf[] (1 page at a time) set
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* the corresponding bit in the memory bitmap @bm
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*/
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static inline struct pbe *unpack_orig_addresses(unsigned long *buf,
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struct pbe *pbe)
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static inline void
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unpack_orig_pfns(unsigned long *buf, struct memory_bitmap *bm)
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{
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int j;
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for (j = 0; j < PAGE_SIZE / sizeof(long) && pbe; j++) {
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pbe->orig_address = buf[j];
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pbe = pbe->next;
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for (j = 0; j < PAGE_SIZE / sizeof(long); j++) {
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if (unlikely(buf[j] == BM_END_OF_MAP))
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break;
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memory_bm_set_bit(bm, buf[j]);
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}
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return pbe;
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}
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/**
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* prepare_image - use metadata contained in the PBE list
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* pointed to by restore_pblist to mark the pages that will
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* be overwritten in the process of restoring the system
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* memory state from the image ("unsafe" pages) and allocate
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* memory for the image
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* prepare_image - use the memory bitmap @bm to mark the pages that will
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* be overwritten in the process of restoring the system memory state
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* from the suspend image ("unsafe" pages) and allocate memory for the
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* image.
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*
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* The idea is to allocate the PBE list first and then
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* allocate as many pages as it's needed for the image data,
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* but not to assign these pages to the PBEs initially.
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* Instead, we just mark them as allocated and create a list
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* of "safe" which will be used later
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* The idea is to allocate a new memory bitmap first and then allocate
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* as many pages as needed for the image data, but not to assign these
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* pages to specific tasks initially. Instead, we just mark them as
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* allocated and create a list of "safe" pages that will be used later.
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*/
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static struct linked_page *safe_pages;
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#define PBES_PER_LINKED_PAGE (LINKED_PAGE_DATA_SIZE / sizeof(struct pbe))
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static int prepare_image(struct snapshot_handle *handle)
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static struct linked_page *safe_pages_list;
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static int
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prepare_image(struct memory_bitmap *new_bm, struct memory_bitmap *bm)
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{
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int error = 0;
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unsigned int nr_pages = nr_copy_pages;
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struct pbe *p, *pblist = NULL;
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unsigned int nr_pages;
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struct linked_page *sp_list, *lp;
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int error;
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p = restore_pblist;
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error = mark_unsafe_pages(p);
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if (!error) {
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pblist = alloc_pagedir(nr_pages, GFP_ATOMIC, PG_SAFE);
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if (pblist)
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copy_page_backup_list(pblist, p);
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free_pagedir(p, PG_UNSAFE_KEEP);
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if (!pblist)
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error = mark_unsafe_pages(bm);
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if (error)
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goto Free;
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error = memory_bm_create(new_bm, GFP_ATOMIC, PG_SAFE);
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if (error)
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goto Free;
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duplicate_memory_bitmap(new_bm, bm);
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memory_bm_free(bm, PG_UNSAFE_KEEP);
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/* Reserve some safe pages for potential later use.
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*
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* NOTE: This way we make sure there will be enough safe pages for the
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* chain_alloc() in get_buffer(). It is a bit wasteful, but
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* nr_copy_pages cannot be greater than 50% of the memory anyway.
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*/
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sp_list = NULL;
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/* nr_copy_pages cannot be lesser than allocated_unsafe_pages */
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nr_pages = nr_copy_pages - allocated_unsafe_pages;
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nr_pages = DIV_ROUND_UP(nr_pages, PBES_PER_LINKED_PAGE);
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while (nr_pages > 0) {
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lp = alloc_image_page(GFP_ATOMIC, PG_SAFE);
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if (!lp) {
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error = -ENOMEM;
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}
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safe_pages = NULL;
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if (!error && nr_pages > unsafe_pages) {
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nr_pages -= unsafe_pages;
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while (nr_pages--) {
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struct linked_page *ptr;
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ptr = (void *)get_zeroed_page(GFP_ATOMIC);
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if (!ptr) {
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error = -ENOMEM;
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break;
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}
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if (!PageNosaveFree(virt_to_page(ptr))) {
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/* The page is "safe", add it to the list */
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ptr->next = safe_pages;
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safe_pages = ptr;
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}
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/* Mark the page as allocated */
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SetPageNosave(virt_to_page(ptr));
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SetPageNosaveFree(virt_to_page(ptr));
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goto Free;
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}
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lp->next = sp_list;
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sp_list = lp;
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nr_pages--;
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}
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if (!error) {
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restore_pblist = pblist;
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} else {
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handle->pbe = NULL;
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swsusp_free();
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/* Preallocate memory for the image */
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safe_pages_list = NULL;
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nr_pages = nr_copy_pages - allocated_unsafe_pages;
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while (nr_pages > 0) {
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lp = (struct linked_page *)get_zeroed_page(GFP_ATOMIC);
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if (!lp) {
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error = -ENOMEM;
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goto Free;
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}
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if (!PageNosaveFree(virt_to_page(lp))) {
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/* The page is "safe", add it to the list */
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lp->next = safe_pages_list;
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safe_pages_list = lp;
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}
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/* Mark the page as allocated */
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SetPageNosave(virt_to_page(lp));
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SetPageNosaveFree(virt_to_page(lp));
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nr_pages--;
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}
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/* Free the reserved safe pages so that chain_alloc() can use them */
|
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while (sp_list) {
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lp = sp_list->next;
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|
|
free_image_page(sp_list, PG_UNSAFE_CLEAR);
|
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sp_list = lp;
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}
|
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return 0;
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|
|
Free:
|
|
|
|
|
swsusp_free();
|
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|
|
return error;
|
|
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|
|
}
|
|
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|
|
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|
|
|
static void *get_buffer(struct snapshot_handle *handle)
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|
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|
|
{
|
|
|
|
|
struct pbe *pbe = handle->pbe, *last = handle->last_pbe;
|
|
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|
|
struct page *page = virt_to_page(pbe->orig_address);
|
|
|
|
|
/**
|
|
|
|
|
* get_buffer - compute the address that snapshot_write_next() should
|
|
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|
|
* set for its caller to write to.
|
|
|
|
|
*/
|
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|
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|
|
if (PageNosave(page) && PageNosaveFree(page)) {
|
|
|
|
|
/*
|
|
|
|
|
* We have allocated the "original" page frame and we can
|
|
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|
|
* use it directly to store the read page
|
|
|
|
|
static void *get_buffer(struct memory_bitmap *bm, struct chain_allocator *ca)
|
|
|
|
|
{
|
|
|
|
|
struct pbe *pbe;
|
|
|
|
|
struct page *page = pfn_to_page(memory_bm_next_pfn(bm));
|
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|
|
if (PageNosave(page) && PageNosaveFree(page))
|
|
|
|
|
/* We have allocated the "original" page frame and we can
|
|
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|
|
* use it directly to store the loaded page.
|
|
|
|
|
*/
|
|
|
|
|
pbe->address = 0;
|
|
|
|
|
if (last && last->next)
|
|
|
|
|
last->next = NULL;
|
|
|
|
|
return (void *)pbe->orig_address;
|
|
|
|
|
}
|
|
|
|
|
/*
|
|
|
|
|
* The "original" page frame has not been allocated and we have to
|
|
|
|
|
* use a "safe" page frame to store the read page
|
|
|
|
|
return page_address(page);
|
|
|
|
|
|
|
|
|
|
/* The "original" page frame has not been allocated and we have to
|
|
|
|
|
* use a "safe" page frame to store the loaded page.
|
|
|
|
|
*/
|
|
|
|
|
pbe->address = (unsigned long)safe_pages;
|
|
|
|
|
safe_pages = safe_pages->next;
|
|
|
|
|
if (last)
|
|
|
|
|
last->next = pbe;
|
|
|
|
|
handle->last_pbe = pbe;
|
|
|
|
|
pbe = chain_alloc(ca, sizeof(struct pbe));
|
|
|
|
|
if (!pbe) {
|
|
|
|
|
swsusp_free();
|
|
|
|
|
return NULL;
|
|
|
|
|
}
|
|
|
|
|
pbe->orig_address = (unsigned long)page_address(page);
|
|
|
|
|
pbe->address = (unsigned long)safe_pages_list;
|
|
|
|
|
safe_pages_list = safe_pages_list->next;
|
|
|
|
|
pbe->next = restore_pblist;
|
|
|
|
|
restore_pblist = pbe;
|
|
|
|
|
return (void *)pbe->address;
|
|
|
|
|
}
|
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|
|
|
|
|
|
@ -1310,10 +1242,13 @@ static void *get_buffer(struct snapshot_handle *handle)
|
|
|
|
|
|
|
|
|
|
int snapshot_write_next(struct snapshot_handle *handle, size_t count)
|
|
|
|
|
{
|
|
|
|
|
static struct chain_allocator ca;
|
|
|
|
|
int error = 0;
|
|
|
|
|
|
|
|
|
|
/* Check if we have already loaded the entire image */
|
|
|
|
|
if (handle->prev && handle->cur > nr_meta_pages + nr_copy_pages)
|
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|
|
|
return 0;
|
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|
|
|
|
|
|
|
if (!buffer) {
|
|
|
|
|
/* This makes the buffer be freed by swsusp_free() */
|
|
|
|
|
buffer = alloc_image_page(GFP_ATOMIC, PG_ANY);
|
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|
|
@ -1324,26 +1259,32 @@ int snapshot_write_next(struct snapshot_handle *handle, size_t count)
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|
|
|
handle->buffer = buffer;
|
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|
|
handle->sync_read = 1;
|
|
|
|
|
if (handle->prev < handle->cur) {
|
|
|
|
|
if (!handle->prev) {
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|
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|
|
error = load_header(handle,
|
|
|
|
|
(struct swsusp_info *)buffer);
|
|
|
|
|
if (handle->prev == 0) {
|
|
|
|
|
error = load_header(buffer);
|
|
|
|
|
if (error)
|
|
|
|
|
return error;
|
|
|
|
|
|
|
|
|
|
error = memory_bm_create(©_bm, GFP_ATOMIC, PG_ANY);
|
|
|
|
|
if (error)
|
|
|
|
|
return error;
|
|
|
|
|
|
|
|
|
|
} else if (handle->prev <= nr_meta_pages) {
|
|
|
|
|
handle->pbe = unpack_orig_addresses(buffer,
|
|
|
|
|
handle->pbe);
|
|
|
|
|
if (!handle->pbe) {
|
|
|
|
|
error = prepare_image(handle);
|
|
|
|
|
unpack_orig_pfns(buffer, ©_bm);
|
|
|
|
|
if (handle->prev == nr_meta_pages) {
|
|
|
|
|
error = prepare_image(&orig_bm, ©_bm);
|
|
|
|
|
if (error)
|
|
|
|
|
return error;
|
|
|
|
|
handle->pbe = restore_pblist;
|
|
|
|
|
handle->last_pbe = NULL;
|
|
|
|
|
handle->buffer = get_buffer(handle);
|
|
|
|
|
|
|
|
|
|
chain_init(&ca, GFP_ATOMIC, PG_SAFE);
|
|
|
|
|
memory_bm_position_reset(&orig_bm);
|
|
|
|
|
restore_pblist = NULL;
|
|
|
|
|
handle->buffer = get_buffer(&orig_bm, &ca);
|
|
|
|
|
handle->sync_read = 0;
|
|
|
|
|
if (!handle->buffer)
|
|
|
|
|
return -ENOMEM;
|
|
|
|
|
}
|
|
|
|
|
} else {
|
|
|
|
|
handle->pbe = handle->pbe->next;
|
|
|
|
|
handle->buffer = get_buffer(handle);
|
|
|
|
|
handle->buffer = get_buffer(&orig_bm, &ca);
|
|
|
|
|
handle->sync_read = 0;
|
|
|
|
|
}
|
|
|
|
|
handle->prev = handle->cur;
|
|
|
|
@ -1362,6 +1303,13 @@ int snapshot_write_next(struct snapshot_handle *handle, size_t count)
|
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|
|
|
|
|
|
|
|
int snapshot_image_loaded(struct snapshot_handle *handle)
|
|
|
|
|
{
|
|
|
|
|
return !(!handle->pbe || handle->pbe->next || !nr_copy_pages ||
|
|
|
|
|
handle->cur <= nr_meta_pages + nr_copy_pages);
|
|
|
|
|
return !(!nr_copy_pages ||
|
|
|
|
|
handle->cur <= nr_meta_pages + nr_copy_pages);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void snapshot_free_unused_memory(struct snapshot_handle *handle)
|
|
|
|
|
{
|
|
|
|
|
/* Free only if we have loaded the image entirely */
|
|
|
|
|
if (handle->prev && handle->cur > nr_meta_pages + nr_copy_pages)
|
|
|
|
|
memory_bm_free(&orig_bm, PG_UNSAFE_CLEAR);
|
|
|
|
|
}
|
|
|
|
|