Commit | Line | Data |
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55716d26 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
61159a31 RW |
2 | /* |
3 | * linux/kernel/power/swap.c | |
4 | * | |
5 | * This file provides functions for reading the suspend image from | |
6 | * and writing it to a swap partition. | |
7 | * | |
a2531293 | 8 | * Copyright (C) 1998,2001-2005 Pavel Machek <pavel@ucw.cz> |
61159a31 | 9 | * Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl> |
5a21d489 | 10 | * Copyright (C) 2010-2012 Bojan Smojver <bojan@rexursive.com> |
61159a31 RW |
11 | */ |
12 | ||
64ec72a1 JP |
13 | #define pr_fmt(fmt) "PM: " fmt |
14 | ||
61159a31 | 15 | #include <linux/module.h> |
61159a31 | 16 | #include <linux/file.h> |
61159a31 RW |
17 | #include <linux/delay.h> |
18 | #include <linux/bitops.h> | |
19 | #include <linux/genhd.h> | |
20 | #include <linux/device.h> | |
61159a31 | 21 | #include <linux/bio.h> |
546e0d27 | 22 | #include <linux/blkdev.h> |
61159a31 RW |
23 | #include <linux/swap.h> |
24 | #include <linux/swapops.h> | |
25 | #include <linux/pm.h> | |
5a0e3ad6 | 26 | #include <linux/slab.h> |
f996fc96 BS |
27 | #include <linux/lzo.h> |
28 | #include <linux/vmalloc.h> | |
081a9d04 BS |
29 | #include <linux/cpumask.h> |
30 | #include <linux/atomic.h> | |
31 | #include <linux/kthread.h> | |
32 | #include <linux/crc32.h> | |
db597605 | 33 | #include <linux/ktime.h> |
61159a31 RW |
34 | |
35 | #include "power.h" | |
36 | ||
be8cd644 | 37 | #define HIBERNATE_SIG "S1SUSPEND" |
61159a31 | 38 | |
f6cf0545 JM |
39 | /* |
40 | * When reading an {un,}compressed image, we may restore pages in place, | |
41 | * in which case some architectures need these pages cleaning before they | |
42 | * can be executed. We don't know which pages these may be, so clean the lot. | |
43 | */ | |
44 | static bool clean_pages_on_read; | |
45 | static bool clean_pages_on_decompress; | |
46 | ||
51fb352b JS |
47 | /* |
48 | * The swap map is a data structure used for keeping track of each page | |
49 | * written to a swap partition. It consists of many swap_map_page | |
90133673 | 50 | * structures that contain each an array of MAP_PAGE_ENTRIES swap entries. |
51fb352b JS |
51 | * These structures are stored on the swap and linked together with the |
52 | * help of the .next_swap member. | |
53 | * | |
54 | * The swap map is created during suspend. The swap map pages are | |
55 | * allocated and populated one at a time, so we only need one memory | |
56 | * page to set up the entire structure. | |
57 | * | |
081a9d04 | 58 | * During resume we pick up all swap_map_page structures into a list. |
51fb352b JS |
59 | */ |
60 | ||
61 | #define MAP_PAGE_ENTRIES (PAGE_SIZE / sizeof(sector_t) - 1) | |
62 | ||
f8262d47 BS |
63 | /* |
64 | * Number of free pages that are not high. | |
65 | */ | |
66 | static inline unsigned long low_free_pages(void) | |
67 | { | |
68 | return nr_free_pages() - nr_free_highpages(); | |
69 | } | |
70 | ||
71 | /* | |
72 | * Number of pages required to be kept free while writing the image. Always | |
73 | * half of all available low pages before the writing starts. | |
74 | */ | |
75 | static inline unsigned long reqd_free_pages(void) | |
76 | { | |
77 | return low_free_pages() / 2; | |
78 | } | |
79 | ||
51fb352b JS |
80 | struct swap_map_page { |
81 | sector_t entries[MAP_PAGE_ENTRIES]; | |
82 | sector_t next_swap; | |
83 | }; | |
84 | ||
081a9d04 BS |
85 | struct swap_map_page_list { |
86 | struct swap_map_page *map; | |
87 | struct swap_map_page_list *next; | |
88 | }; | |
89 | ||
51fb352b JS |
90 | /** |
91 | * The swap_map_handle structure is used for handling swap in | |
92 | * a file-alike way | |
93 | */ | |
94 | ||
95 | struct swap_map_handle { | |
96 | struct swap_map_page *cur; | |
081a9d04 | 97 | struct swap_map_page_list *maps; |
51fb352b JS |
98 | sector_t cur_swap; |
99 | sector_t first_sector; | |
100 | unsigned int k; | |
f8262d47 | 101 | unsigned long reqd_free_pages; |
081a9d04 | 102 | u32 crc32; |
51fb352b JS |
103 | }; |
104 | ||
1b29c164 | 105 | struct swsusp_header { |
081a9d04 BS |
106 | char reserved[PAGE_SIZE - 20 - sizeof(sector_t) - sizeof(int) - |
107 | sizeof(u32)]; | |
108 | u32 crc32; | |
3aef83e0 | 109 | sector_t image; |
a634cc10 | 110 | unsigned int flags; /* Flags to pass to the "boot" kernel */ |
61159a31 RW |
111 | char orig_sig[10]; |
112 | char sig[10]; | |
52f5684c | 113 | } __packed; |
1b29c164 VG |
114 | |
115 | static struct swsusp_header *swsusp_header; | |
61159a31 | 116 | |
0414f2ec NC |
117 | /** |
118 | * The following functions are used for tracing the allocated | |
119 | * swap pages, so that they can be freed in case of an error. | |
120 | */ | |
121 | ||
122 | struct swsusp_extent { | |
123 | struct rb_node node; | |
124 | unsigned long start; | |
125 | unsigned long end; | |
126 | }; | |
127 | ||
128 | static struct rb_root swsusp_extents = RB_ROOT; | |
129 | ||
130 | static int swsusp_extents_insert(unsigned long swap_offset) | |
131 | { | |
132 | struct rb_node **new = &(swsusp_extents.rb_node); | |
133 | struct rb_node *parent = NULL; | |
134 | struct swsusp_extent *ext; | |
135 | ||
136 | /* Figure out where to put the new node */ | |
137 | while (*new) { | |
8316bd72 | 138 | ext = rb_entry(*new, struct swsusp_extent, node); |
0414f2ec NC |
139 | parent = *new; |
140 | if (swap_offset < ext->start) { | |
141 | /* Try to merge */ | |
142 | if (swap_offset == ext->start - 1) { | |
143 | ext->start--; | |
144 | return 0; | |
145 | } | |
146 | new = &((*new)->rb_left); | |
147 | } else if (swap_offset > ext->end) { | |
148 | /* Try to merge */ | |
149 | if (swap_offset == ext->end + 1) { | |
150 | ext->end++; | |
151 | return 0; | |
152 | } | |
153 | new = &((*new)->rb_right); | |
154 | } else { | |
155 | /* It already is in the tree */ | |
156 | return -EINVAL; | |
157 | } | |
158 | } | |
159 | /* Add the new node and rebalance the tree. */ | |
160 | ext = kzalloc(sizeof(struct swsusp_extent), GFP_KERNEL); | |
161 | if (!ext) | |
162 | return -ENOMEM; | |
163 | ||
164 | ext->start = swap_offset; | |
165 | ext->end = swap_offset; | |
166 | rb_link_node(&ext->node, parent, new); | |
167 | rb_insert_color(&ext->node, &swsusp_extents); | |
168 | return 0; | |
169 | } | |
170 | ||
171 | /** | |
172 | * alloc_swapdev_block - allocate a swap page and register that it has | |
173 | * been allocated, so that it can be freed in case of an error. | |
174 | */ | |
175 | ||
176 | sector_t alloc_swapdev_block(int swap) | |
177 | { | |
178 | unsigned long offset; | |
179 | ||
910321ea | 180 | offset = swp_offset(get_swap_page_of_type(swap)); |
0414f2ec NC |
181 | if (offset) { |
182 | if (swsusp_extents_insert(offset)) | |
910321ea | 183 | swap_free(swp_entry(swap, offset)); |
0414f2ec NC |
184 | else |
185 | return swapdev_block(swap, offset); | |
186 | } | |
187 | return 0; | |
188 | } | |
189 | ||
190 | /** | |
191 | * free_all_swap_pages - free swap pages allocated for saving image data. | |
90133673 | 192 | * It also frees the extents used to register which swap entries had been |
0414f2ec NC |
193 | * allocated. |
194 | */ | |
195 | ||
196 | void free_all_swap_pages(int swap) | |
197 | { | |
198 | struct rb_node *node; | |
199 | ||
200 | while ((node = swsusp_extents.rb_node)) { | |
201 | struct swsusp_extent *ext; | |
202 | unsigned long offset; | |
203 | ||
47087eeb | 204 | ext = rb_entry(node, struct swsusp_extent, node); |
0414f2ec NC |
205 | rb_erase(node, &swsusp_extents); |
206 | for (offset = ext->start; offset <= ext->end; offset++) | |
910321ea | 207 | swap_free(swp_entry(swap, offset)); |
0414f2ec NC |
208 | |
209 | kfree(ext); | |
210 | } | |
211 | } | |
212 | ||
213 | int swsusp_swap_in_use(void) | |
214 | { | |
215 | return (swsusp_extents.rb_node != NULL); | |
216 | } | |
217 | ||
61159a31 | 218 | /* |
3fc6b34f | 219 | * General things |
61159a31 RW |
220 | */ |
221 | ||
222 | static unsigned short root_swap = 0xffff; | |
343df3c7 CH |
223 | static struct block_device *hib_resume_bdev; |
224 | ||
225 | struct hib_bio_batch { | |
226 | atomic_t count; | |
227 | wait_queue_head_t wait; | |
4e4cbee9 | 228 | blk_status_t error; |
55c4478a | 229 | struct blk_plug plug; |
343df3c7 CH |
230 | }; |
231 | ||
232 | static void hib_init_batch(struct hib_bio_batch *hb) | |
233 | { | |
234 | atomic_set(&hb->count, 0); | |
235 | init_waitqueue_head(&hb->wait); | |
4e4cbee9 | 236 | hb->error = BLK_STS_OK; |
55c4478a XC |
237 | blk_start_plug(&hb->plug); |
238 | } | |
239 | ||
240 | static void hib_finish_batch(struct hib_bio_batch *hb) | |
241 | { | |
242 | blk_finish_plug(&hb->plug); | |
343df3c7 CH |
243 | } |
244 | ||
4246a0b6 | 245 | static void hib_end_io(struct bio *bio) |
343df3c7 CH |
246 | { |
247 | struct hib_bio_batch *hb = bio->bi_private; | |
263663cd | 248 | struct page *page = bio_first_page_all(bio); |
343df3c7 | 249 | |
4e4cbee9 | 250 | if (bio->bi_status) { |
64ec72a1 JP |
251 | pr_alert("Read-error on swap-device (%u:%u:%Lu)\n", |
252 | MAJOR(bio_dev(bio)), MINOR(bio_dev(bio)), | |
253 | (unsigned long long)bio->bi_iter.bi_sector); | |
343df3c7 CH |
254 | } |
255 | ||
256 | if (bio_data_dir(bio) == WRITE) | |
257 | put_page(page); | |
f6cf0545 JM |
258 | else if (clean_pages_on_read) |
259 | flush_icache_range((unsigned long)page_address(page), | |
260 | (unsigned long)page_address(page) + PAGE_SIZE); | |
343df3c7 | 261 | |
4e4cbee9 CH |
262 | if (bio->bi_status && !hb->error) |
263 | hb->error = bio->bi_status; | |
343df3c7 CH |
264 | if (atomic_dec_and_test(&hb->count)) |
265 | wake_up(&hb->wait); | |
266 | ||
267 | bio_put(bio); | |
268 | } | |
269 | ||
162b99e3 | 270 | static int hib_submit_io(int op, int op_flags, pgoff_t page_off, void *addr, |
343df3c7 CH |
271 | struct hib_bio_batch *hb) |
272 | { | |
273 | struct page *page = virt_to_page(addr); | |
274 | struct bio *bio; | |
275 | int error = 0; | |
276 | ||
0eb0b63c | 277 | bio = bio_alloc(GFP_NOIO | __GFP_HIGH, 1); |
343df3c7 | 278 | bio->bi_iter.bi_sector = page_off * (PAGE_SIZE >> 9); |
74d46992 | 279 | bio_set_dev(bio, hib_resume_bdev); |
162b99e3 | 280 | bio_set_op_attrs(bio, op, op_flags); |
343df3c7 CH |
281 | |
282 | if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) { | |
64ec72a1 JP |
283 | pr_err("Adding page to bio failed at %llu\n", |
284 | (unsigned long long)bio->bi_iter.bi_sector); | |
343df3c7 CH |
285 | bio_put(bio); |
286 | return -EFAULT; | |
287 | } | |
288 | ||
289 | if (hb) { | |
290 | bio->bi_end_io = hib_end_io; | |
291 | bio->bi_private = hb; | |
292 | atomic_inc(&hb->count); | |
4e49ea4a | 293 | submit_bio(bio); |
343df3c7 | 294 | } else { |
4e49ea4a | 295 | error = submit_bio_wait(bio); |
343df3c7 CH |
296 | bio_put(bio); |
297 | } | |
298 | ||
299 | return error; | |
300 | } | |
301 | ||
01de5fcd | 302 | static int hib_wait_io(struct hib_bio_batch *hb) |
343df3c7 | 303 | { |
55c4478a XC |
304 | /* |
305 | * We are relying on the behavior of blk_plug that a thread with | |
306 | * a plug will flush the plug list before sleeping. | |
307 | */ | |
343df3c7 | 308 | wait_event(hb->wait, atomic_read(&hb->count) == 0); |
01de5fcd | 309 | return blk_status_to_errno(hb->error); |
343df3c7 | 310 | } |
3fc6b34f | 311 | |
3fc6b34f RW |
312 | /* |
313 | * Saving part | |
314 | */ | |
61159a31 | 315 | |
51fb352b | 316 | static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags) |
61159a31 RW |
317 | { |
318 | int error; | |
319 | ||
70fd7614 | 320 | hib_submit_io(REQ_OP_READ, 0, swsusp_resume_block, |
162b99e3 | 321 | swsusp_header, NULL); |
1b29c164 VG |
322 | if (!memcmp("SWAP-SPACE",swsusp_header->sig, 10) || |
323 | !memcmp("SWAPSPACE2",swsusp_header->sig, 10)) { | |
324 | memcpy(swsusp_header->orig_sig,swsusp_header->sig, 10); | |
3624eb04 | 325 | memcpy(swsusp_header->sig, HIBERNATE_SIG, 10); |
51fb352b | 326 | swsusp_header->image = handle->first_sector; |
a634cc10 | 327 | swsusp_header->flags = flags; |
081a9d04 BS |
328 | if (flags & SF_CRC32_MODE) |
329 | swsusp_header->crc32 = handle->crc32; | |
70fd7614 | 330 | error = hib_submit_io(REQ_OP_WRITE, REQ_SYNC, |
162b99e3 | 331 | swsusp_resume_block, swsusp_header, NULL); |
61159a31 | 332 | } else { |
64ec72a1 | 333 | pr_err("Swap header not found!\n"); |
61159a31 RW |
334 | error = -ENODEV; |
335 | } | |
336 | return error; | |
337 | } | |
338 | ||
339 | /** | |
340 | * swsusp_swap_check - check if the resume device is a swap device | |
341 | * and get its index (if so) | |
6f612af5 JS |
342 | * |
343 | * This is called before saving image | |
61159a31 | 344 | */ |
6f612af5 | 345 | static int swsusp_swap_check(void) |
61159a31 | 346 | { |
3aef83e0 RW |
347 | int res; |
348 | ||
21bd9005 CH |
349 | if (swsusp_resume_device) |
350 | res = swap_type_of(swsusp_resume_device, swsusp_resume_block); | |
351 | else | |
352 | res = find_first_swap(&swsusp_resume_device); | |
3aef83e0 RW |
353 | if (res < 0) |
354 | return res; | |
3aef83e0 | 355 | root_swap = res; |
21bd9005 | 356 | |
36daaa98 CH |
357 | hib_resume_bdev = blkdev_get_by_dev(swsusp_resume_device, FMODE_WRITE, |
358 | NULL); | |
359 | if (IS_ERR(hib_resume_bdev)) | |
360 | return PTR_ERR(hib_resume_bdev); | |
3aef83e0 | 361 | |
8a0d613f | 362 | res = set_blocksize(hib_resume_bdev, PAGE_SIZE); |
3aef83e0 | 363 | if (res < 0) |
8a0d613f | 364 | blkdev_put(hib_resume_bdev, FMODE_WRITE); |
61159a31 | 365 | |
61159a31 RW |
366 | return res; |
367 | } | |
368 | ||
369 | /** | |
370 | * write_page - Write one page to given swap location. | |
371 | * @buf: Address we're writing. | |
372 | * @offset: Offset of the swap page we're writing to. | |
343df3c7 | 373 | * @hb: bio completion batch |
61159a31 RW |
374 | */ |
375 | ||
343df3c7 | 376 | static int write_page(void *buf, sector_t offset, struct hib_bio_batch *hb) |
61159a31 | 377 | { |
3aef83e0 | 378 | void *src; |
081a9d04 | 379 | int ret; |
3aef83e0 RW |
380 | |
381 | if (!offset) | |
382 | return -ENOSPC; | |
383 | ||
343df3c7 | 384 | if (hb) { |
0eb0b63c | 385 | src = (void *)__get_free_page(GFP_NOIO | __GFP_NOWARN | |
5a21d489 | 386 | __GFP_NORETRY); |
3aef83e0 | 387 | if (src) { |
3ecb01df | 388 | copy_page(src, buf); |
3aef83e0 | 389 | } else { |
343df3c7 | 390 | ret = hib_wait_io(hb); /* Free pages */ |
081a9d04 BS |
391 | if (ret) |
392 | return ret; | |
0eb0b63c | 393 | src = (void *)__get_free_page(GFP_NOIO | |
5a21d489 BS |
394 | __GFP_NOWARN | |
395 | __GFP_NORETRY); | |
081a9d04 BS |
396 | if (src) { |
397 | copy_page(src, buf); | |
398 | } else { | |
399 | WARN_ON_ONCE(1); | |
343df3c7 | 400 | hb = NULL; /* Go synchronous */ |
081a9d04 BS |
401 | src = buf; |
402 | } | |
ab954160 | 403 | } |
3aef83e0 RW |
404 | } else { |
405 | src = buf; | |
61159a31 | 406 | } |
70fd7614 | 407 | return hib_submit_io(REQ_OP_WRITE, REQ_SYNC, offset, src, hb); |
61159a31 RW |
408 | } |
409 | ||
61159a31 RW |
410 | static void release_swap_writer(struct swap_map_handle *handle) |
411 | { | |
412 | if (handle->cur) | |
413 | free_page((unsigned long)handle->cur); | |
414 | handle->cur = NULL; | |
61159a31 RW |
415 | } |
416 | ||
417 | static int get_swap_writer(struct swap_map_handle *handle) | |
418 | { | |
6f612af5 JS |
419 | int ret; |
420 | ||
421 | ret = swsusp_swap_check(); | |
422 | if (ret) { | |
423 | if (ret != -ENOSPC) | |
64ec72a1 | 424 | pr_err("Cannot find swap device, try swapon -a\n"); |
6f612af5 JS |
425 | return ret; |
426 | } | |
61159a31 | 427 | handle->cur = (struct swap_map_page *)get_zeroed_page(GFP_KERNEL); |
6f612af5 JS |
428 | if (!handle->cur) { |
429 | ret = -ENOMEM; | |
430 | goto err_close; | |
431 | } | |
d1d241cc | 432 | handle->cur_swap = alloc_swapdev_block(root_swap); |
61159a31 | 433 | if (!handle->cur_swap) { |
6f612af5 JS |
434 | ret = -ENOSPC; |
435 | goto err_rel; | |
61159a31 RW |
436 | } |
437 | handle->k = 0; | |
f8262d47 | 438 | handle->reqd_free_pages = reqd_free_pages(); |
51fb352b | 439 | handle->first_sector = handle->cur_swap; |
61159a31 | 440 | return 0; |
6f612af5 JS |
441 | err_rel: |
442 | release_swap_writer(handle); | |
443 | err_close: | |
444 | swsusp_close(FMODE_WRITE); | |
445 | return ret; | |
61159a31 RW |
446 | } |
447 | ||
ab954160 | 448 | static int swap_write_page(struct swap_map_handle *handle, void *buf, |
343df3c7 | 449 | struct hib_bio_batch *hb) |
ab954160 AM |
450 | { |
451 | int error = 0; | |
3aef83e0 | 452 | sector_t offset; |
61159a31 RW |
453 | |
454 | if (!handle->cur) | |
455 | return -EINVAL; | |
d1d241cc | 456 | offset = alloc_swapdev_block(root_swap); |
343df3c7 | 457 | error = write_page(buf, offset, hb); |
61159a31 RW |
458 | if (error) |
459 | return error; | |
460 | handle->cur->entries[handle->k++] = offset; | |
461 | if (handle->k >= MAP_PAGE_ENTRIES) { | |
d1d241cc | 462 | offset = alloc_swapdev_block(root_swap); |
61159a31 RW |
463 | if (!offset) |
464 | return -ENOSPC; | |
465 | handle->cur->next_swap = offset; | |
343df3c7 | 466 | error = write_page(handle->cur, handle->cur_swap, hb); |
61159a31 | 467 | if (error) |
ab954160 | 468 | goto out; |
3ecb01df | 469 | clear_page(handle->cur); |
61159a31 RW |
470 | handle->cur_swap = offset; |
471 | handle->k = 0; | |
5a21d489 | 472 | |
343df3c7 CH |
473 | if (hb && low_free_pages() <= handle->reqd_free_pages) { |
474 | error = hib_wait_io(hb); | |
5a21d489 BS |
475 | if (error) |
476 | goto out; | |
477 | /* | |
478 | * Recalculate the number of required free pages, to | |
479 | * make sure we never take more than half. | |
480 | */ | |
481 | handle->reqd_free_pages = reqd_free_pages(); | |
482 | } | |
081a9d04 | 483 | } |
59a49335 | 484 | out: |
ab954160 | 485 | return error; |
61159a31 RW |
486 | } |
487 | ||
488 | static int flush_swap_writer(struct swap_map_handle *handle) | |
489 | { | |
490 | if (handle->cur && handle->cur_swap) | |
ab954160 | 491 | return write_page(handle->cur, handle->cur_swap, NULL); |
61159a31 RW |
492 | else |
493 | return -EINVAL; | |
494 | } | |
495 | ||
6f612af5 JS |
496 | static int swap_writer_finish(struct swap_map_handle *handle, |
497 | unsigned int flags, int error) | |
498 | { | |
499 | if (!error) { | |
64ec72a1 | 500 | pr_info("S"); |
6f612af5 | 501 | error = mark_swapfiles(handle, flags); |
64ec72a1 | 502 | pr_cont("|\n"); |
fef9c8d2 | 503 | flush_swap_writer(handle); |
6f612af5 JS |
504 | } |
505 | ||
506 | if (error) | |
507 | free_all_swap_pages(root_swap); | |
508 | release_swap_writer(handle); | |
509 | swsusp_close(FMODE_WRITE); | |
510 | ||
511 | return error; | |
512 | } | |
513 | ||
f996fc96 BS |
514 | /* We need to remember how much compressed data we need to read. */ |
515 | #define LZO_HEADER sizeof(size_t) | |
516 | ||
517 | /* Number of pages/bytes we'll compress at one time. */ | |
518 | #define LZO_UNC_PAGES 32 | |
519 | #define LZO_UNC_SIZE (LZO_UNC_PAGES * PAGE_SIZE) | |
520 | ||
521 | /* Number of pages/bytes we need for compressed data (worst case). */ | |
522 | #define LZO_CMP_PAGES DIV_ROUND_UP(lzo1x_worst_compress(LZO_UNC_SIZE) + \ | |
523 | LZO_HEADER, PAGE_SIZE) | |
524 | #define LZO_CMP_SIZE (LZO_CMP_PAGES * PAGE_SIZE) | |
525 | ||
081a9d04 BS |
526 | /* Maximum number of threads for compression/decompression. */ |
527 | #define LZO_THREADS 3 | |
528 | ||
5a21d489 BS |
529 | /* Minimum/maximum number of pages for read buffering. */ |
530 | #define LZO_MIN_RD_PAGES 1024 | |
531 | #define LZO_MAX_RD_PAGES 8192 | |
081a9d04 BS |
532 | |
533 | ||
61159a31 RW |
534 | /** |
535 | * save_image - save the suspend image data | |
536 | */ | |
537 | ||
538 | static int save_image(struct swap_map_handle *handle, | |
539 | struct snapshot_handle *snapshot, | |
3a4f7577 | 540 | unsigned int nr_to_write) |
61159a31 RW |
541 | { |
542 | unsigned int m; | |
543 | int ret; | |
3a4f7577 | 544 | int nr_pages; |
ab954160 | 545 | int err2; |
343df3c7 | 546 | struct hib_bio_batch hb; |
db597605 TR |
547 | ktime_t start; |
548 | ktime_t stop; | |
61159a31 | 549 | |
343df3c7 CH |
550 | hib_init_batch(&hb); |
551 | ||
64ec72a1 | 552 | pr_info("Saving image data pages (%u pages)...\n", |
23976728 | 553 | nr_to_write); |
d8150d35 | 554 | m = nr_to_write / 10; |
61159a31 RW |
555 | if (!m) |
556 | m = 1; | |
557 | nr_pages = 0; | |
db597605 | 558 | start = ktime_get(); |
4ff277f9 | 559 | while (1) { |
d3c1b24c | 560 | ret = snapshot_read_next(snapshot); |
4ff277f9 JS |
561 | if (ret <= 0) |
562 | break; | |
343df3c7 | 563 | ret = swap_write_page(handle, data_of(*snapshot), &hb); |
4ff277f9 JS |
564 | if (ret) |
565 | break; | |
566 | if (!(nr_pages % m)) | |
64ec72a1 JP |
567 | pr_info("Image saving progress: %3d%%\n", |
568 | nr_pages / m * 10); | |
4ff277f9 JS |
569 | nr_pages++; |
570 | } | |
343df3c7 | 571 | err2 = hib_wait_io(&hb); |
55c4478a | 572 | hib_finish_batch(&hb); |
db597605 | 573 | stop = ktime_get(); |
4ff277f9 JS |
574 | if (!ret) |
575 | ret = err2; | |
576 | if (!ret) | |
64ec72a1 | 577 | pr_info("Image saving done\n"); |
db597605 | 578 | swsusp_show_speed(start, stop, nr_to_write, "Wrote"); |
4ff277f9 | 579 | return ret; |
61159a31 RW |
580 | } |
581 | ||
081a9d04 BS |
582 | /** |
583 | * Structure used for CRC32. | |
584 | */ | |
585 | struct crc_data { | |
586 | struct task_struct *thr; /* thread */ | |
587 | atomic_t ready; /* ready to start flag */ | |
588 | atomic_t stop; /* ready to stop flag */ | |
589 | unsigned run_threads; /* nr current threads */ | |
590 | wait_queue_head_t go; /* start crc update */ | |
591 | wait_queue_head_t done; /* crc update done */ | |
592 | u32 *crc32; /* points to handle's crc32 */ | |
593 | size_t *unc_len[LZO_THREADS]; /* uncompressed lengths */ | |
594 | unsigned char *unc[LZO_THREADS]; /* uncompressed data */ | |
595 | }; | |
596 | ||
597 | /** | |
598 | * CRC32 update function that runs in its own thread. | |
599 | */ | |
600 | static int crc32_threadfn(void *data) | |
601 | { | |
602 | struct crc_data *d = data; | |
603 | unsigned i; | |
604 | ||
605 | while (1) { | |
606 | wait_event(d->go, atomic_read(&d->ready) || | |
607 | kthread_should_stop()); | |
608 | if (kthread_should_stop()) { | |
609 | d->thr = NULL; | |
610 | atomic_set(&d->stop, 1); | |
611 | wake_up(&d->done); | |
612 | break; | |
613 | } | |
614 | atomic_set(&d->ready, 0); | |
615 | ||
616 | for (i = 0; i < d->run_threads; i++) | |
617 | *d->crc32 = crc32_le(*d->crc32, | |
618 | d->unc[i], *d->unc_len[i]); | |
619 | atomic_set(&d->stop, 1); | |
620 | wake_up(&d->done); | |
621 | } | |
622 | return 0; | |
623 | } | |
624 | /** | |
625 | * Structure used for LZO data compression. | |
626 | */ | |
627 | struct cmp_data { | |
628 | struct task_struct *thr; /* thread */ | |
629 | atomic_t ready; /* ready to start flag */ | |
630 | atomic_t stop; /* ready to stop flag */ | |
631 | int ret; /* return code */ | |
632 | wait_queue_head_t go; /* start compression */ | |
633 | wait_queue_head_t done; /* compression done */ | |
634 | size_t unc_len; /* uncompressed length */ | |
635 | size_t cmp_len; /* compressed length */ | |
636 | unsigned char unc[LZO_UNC_SIZE]; /* uncompressed buffer */ | |
637 | unsigned char cmp[LZO_CMP_SIZE]; /* compressed buffer */ | |
638 | unsigned char wrk[LZO1X_1_MEM_COMPRESS]; /* compression workspace */ | |
639 | }; | |
640 | ||
641 | /** | |
642 | * Compression function that runs in its own thread. | |
643 | */ | |
644 | static int lzo_compress_threadfn(void *data) | |
645 | { | |
646 | struct cmp_data *d = data; | |
647 | ||
648 | while (1) { | |
649 | wait_event(d->go, atomic_read(&d->ready) || | |
650 | kthread_should_stop()); | |
651 | if (kthread_should_stop()) { | |
652 | d->thr = NULL; | |
653 | d->ret = -1; | |
654 | atomic_set(&d->stop, 1); | |
655 | wake_up(&d->done); | |
656 | break; | |
657 | } | |
658 | atomic_set(&d->ready, 0); | |
659 | ||
660 | d->ret = lzo1x_1_compress(d->unc, d->unc_len, | |
661 | d->cmp + LZO_HEADER, &d->cmp_len, | |
662 | d->wrk); | |
663 | atomic_set(&d->stop, 1); | |
664 | wake_up(&d->done); | |
665 | } | |
666 | return 0; | |
667 | } | |
f996fc96 BS |
668 | |
669 | /** | |
670 | * save_image_lzo - Save the suspend image data compressed with LZO. | |
057b0a75 | 671 | * @handle: Swap map handle to use for saving the image. |
f996fc96 BS |
672 | * @snapshot: Image to read data from. |
673 | * @nr_to_write: Number of pages to save. | |
674 | */ | |
675 | static int save_image_lzo(struct swap_map_handle *handle, | |
676 | struct snapshot_handle *snapshot, | |
677 | unsigned int nr_to_write) | |
678 | { | |
679 | unsigned int m; | |
680 | int ret = 0; | |
681 | int nr_pages; | |
682 | int err2; | |
343df3c7 | 683 | struct hib_bio_batch hb; |
db597605 TR |
684 | ktime_t start; |
685 | ktime_t stop; | |
081a9d04 BS |
686 | size_t off; |
687 | unsigned thr, run_threads, nr_threads; | |
688 | unsigned char *page = NULL; | |
689 | struct cmp_data *data = NULL; | |
690 | struct crc_data *crc = NULL; | |
691 | ||
343df3c7 CH |
692 | hib_init_batch(&hb); |
693 | ||
081a9d04 BS |
694 | /* |
695 | * We'll limit the number of threads for compression to limit memory | |
696 | * footprint. | |
697 | */ | |
698 | nr_threads = num_online_cpus() - 1; | |
699 | nr_threads = clamp_val(nr_threads, 1, LZO_THREADS); | |
f996fc96 | 700 | |
0eb0b63c | 701 | page = (void *)__get_free_page(GFP_NOIO | __GFP_HIGH); |
f996fc96 | 702 | if (!page) { |
64ec72a1 | 703 | pr_err("Failed to allocate LZO page\n"); |
081a9d04 BS |
704 | ret = -ENOMEM; |
705 | goto out_clean; | |
f996fc96 BS |
706 | } |
707 | ||
9437e393 | 708 | data = vzalloc(array_size(nr_threads, sizeof(*data))); |
081a9d04 | 709 | if (!data) { |
64ec72a1 | 710 | pr_err("Failed to allocate LZO data\n"); |
081a9d04 BS |
711 | ret = -ENOMEM; |
712 | goto out_clean; | |
f996fc96 BS |
713 | } |
714 | ||
9437e393 | 715 | crc = kzalloc(sizeof(*crc), GFP_KERNEL); |
081a9d04 | 716 | if (!crc) { |
64ec72a1 | 717 | pr_err("Failed to allocate crc\n"); |
081a9d04 BS |
718 | ret = -ENOMEM; |
719 | goto out_clean; | |
720 | } | |
081a9d04 BS |
721 | |
722 | /* | |
723 | * Start the compression threads. | |
724 | */ | |
725 | for (thr = 0; thr < nr_threads; thr++) { | |
726 | init_waitqueue_head(&data[thr].go); | |
727 | init_waitqueue_head(&data[thr].done); | |
728 | ||
729 | data[thr].thr = kthread_run(lzo_compress_threadfn, | |
730 | &data[thr], | |
731 | "image_compress/%u", thr); | |
732 | if (IS_ERR(data[thr].thr)) { | |
733 | data[thr].thr = NULL; | |
64ec72a1 | 734 | pr_err("Cannot start compression threads\n"); |
081a9d04 BS |
735 | ret = -ENOMEM; |
736 | goto out_clean; | |
737 | } | |
f996fc96 BS |
738 | } |
739 | ||
081a9d04 BS |
740 | /* |
741 | * Start the CRC32 thread. | |
742 | */ | |
743 | init_waitqueue_head(&crc->go); | |
744 | init_waitqueue_head(&crc->done); | |
745 | ||
746 | handle->crc32 = 0; | |
747 | crc->crc32 = &handle->crc32; | |
748 | for (thr = 0; thr < nr_threads; thr++) { | |
749 | crc->unc[thr] = data[thr].unc; | |
750 | crc->unc_len[thr] = &data[thr].unc_len; | |
751 | } | |
752 | ||
753 | crc->thr = kthread_run(crc32_threadfn, crc, "image_crc32"); | |
754 | if (IS_ERR(crc->thr)) { | |
755 | crc->thr = NULL; | |
64ec72a1 | 756 | pr_err("Cannot start CRC32 thread\n"); |
081a9d04 BS |
757 | ret = -ENOMEM; |
758 | goto out_clean; | |
f996fc96 BS |
759 | } |
760 | ||
5a21d489 BS |
761 | /* |
762 | * Adjust the number of required free pages after all allocations have | |
763 | * been done. We don't want to run out of pages when writing. | |
764 | */ | |
765 | handle->reqd_free_pages = reqd_free_pages(); | |
766 | ||
64ec72a1 JP |
767 | pr_info("Using %u thread(s) for compression\n", nr_threads); |
768 | pr_info("Compressing and saving image data (%u pages)...\n", | |
769 | nr_to_write); | |
d8150d35 | 770 | m = nr_to_write / 10; |
f996fc96 BS |
771 | if (!m) |
772 | m = 1; | |
773 | nr_pages = 0; | |
db597605 | 774 | start = ktime_get(); |
f996fc96 | 775 | for (;;) { |
081a9d04 BS |
776 | for (thr = 0; thr < nr_threads; thr++) { |
777 | for (off = 0; off < LZO_UNC_SIZE; off += PAGE_SIZE) { | |
778 | ret = snapshot_read_next(snapshot); | |
779 | if (ret < 0) | |
780 | goto out_finish; | |
781 | ||
782 | if (!ret) | |
783 | break; | |
784 | ||
785 | memcpy(data[thr].unc + off, | |
786 | data_of(*snapshot), PAGE_SIZE); | |
787 | ||
788 | if (!(nr_pages % m)) | |
64ec72a1 JP |
789 | pr_info("Image saving progress: %3d%%\n", |
790 | nr_pages / m * 10); | |
081a9d04 BS |
791 | nr_pages++; |
792 | } | |
793 | if (!off) | |
f996fc96 BS |
794 | break; |
795 | ||
081a9d04 | 796 | data[thr].unc_len = off; |
f996fc96 | 797 | |
081a9d04 BS |
798 | atomic_set(&data[thr].ready, 1); |
799 | wake_up(&data[thr].go); | |
f996fc96 BS |
800 | } |
801 | ||
081a9d04 | 802 | if (!thr) |
f996fc96 BS |
803 | break; |
804 | ||
081a9d04 BS |
805 | crc->run_threads = thr; |
806 | atomic_set(&crc->ready, 1); | |
807 | wake_up(&crc->go); | |
f996fc96 | 808 | |
081a9d04 BS |
809 | for (run_threads = thr, thr = 0; thr < run_threads; thr++) { |
810 | wait_event(data[thr].done, | |
811 | atomic_read(&data[thr].stop)); | |
812 | atomic_set(&data[thr].stop, 0); | |
f996fc96 | 813 | |
081a9d04 | 814 | ret = data[thr].ret; |
f996fc96 | 815 | |
081a9d04 | 816 | if (ret < 0) { |
64ec72a1 | 817 | pr_err("LZO compression failed\n"); |
081a9d04 BS |
818 | goto out_finish; |
819 | } | |
f996fc96 | 820 | |
081a9d04 BS |
821 | if (unlikely(!data[thr].cmp_len || |
822 | data[thr].cmp_len > | |
823 | lzo1x_worst_compress(data[thr].unc_len))) { | |
64ec72a1 | 824 | pr_err("Invalid LZO compressed length\n"); |
081a9d04 | 825 | ret = -1; |
f996fc96 | 826 | goto out_finish; |
081a9d04 BS |
827 | } |
828 | ||
829 | *(size_t *)data[thr].cmp = data[thr].cmp_len; | |
830 | ||
831 | /* | |
832 | * Given we are writing one page at a time to disk, we | |
833 | * copy that much from the buffer, although the last | |
834 | * bit will likely be smaller than full page. This is | |
835 | * OK - we saved the length of the compressed data, so | |
836 | * any garbage at the end will be discarded when we | |
837 | * read it. | |
838 | */ | |
839 | for (off = 0; | |
840 | off < LZO_HEADER + data[thr].cmp_len; | |
841 | off += PAGE_SIZE) { | |
842 | memcpy(page, data[thr].cmp + off, PAGE_SIZE); | |
843 | ||
343df3c7 | 844 | ret = swap_write_page(handle, page, &hb); |
081a9d04 BS |
845 | if (ret) |
846 | goto out_finish; | |
847 | } | |
f996fc96 | 848 | } |
081a9d04 BS |
849 | |
850 | wait_event(crc->done, atomic_read(&crc->stop)); | |
851 | atomic_set(&crc->stop, 0); | |
f996fc96 BS |
852 | } |
853 | ||
854 | out_finish: | |
343df3c7 | 855 | err2 = hib_wait_io(&hb); |
db597605 | 856 | stop = ktime_get(); |
f996fc96 BS |
857 | if (!ret) |
858 | ret = err2; | |
d8150d35 | 859 | if (!ret) |
64ec72a1 | 860 | pr_info("Image saving done\n"); |
db597605 | 861 | swsusp_show_speed(start, stop, nr_to_write, "Wrote"); |
081a9d04 | 862 | out_clean: |
55c4478a | 863 | hib_finish_batch(&hb); |
081a9d04 BS |
864 | if (crc) { |
865 | if (crc->thr) | |
866 | kthread_stop(crc->thr); | |
867 | kfree(crc); | |
868 | } | |
869 | if (data) { | |
870 | for (thr = 0; thr < nr_threads; thr++) | |
871 | if (data[thr].thr) | |
872 | kthread_stop(data[thr].thr); | |
873 | vfree(data); | |
874 | } | |
875 | if (page) free_page((unsigned long)page); | |
f996fc96 BS |
876 | |
877 | return ret; | |
878 | } | |
879 | ||
61159a31 RW |
880 | /** |
881 | * enough_swap - Make sure we have enough swap to save the image. | |
882 | * | |
883 | * Returns TRUE or FALSE after checking the total amount of swap | |
e4b2897a | 884 | * space available from the resume partition. |
61159a31 RW |
885 | */ |
886 | ||
8ffdfe35 | 887 | static int enough_swap(unsigned int nr_pages) |
61159a31 RW |
888 | { |
889 | unsigned int free_swap = count_swap_pages(root_swap, 1); | |
f996fc96 | 890 | unsigned int required; |
61159a31 | 891 | |
64ec72a1 | 892 | pr_debug("Free swap pages: %u\n", free_swap); |
f996fc96 | 893 | |
ee34a370 | 894 | required = PAGES_FOR_IO + nr_pages; |
f996fc96 | 895 | return free_swap > required; |
61159a31 RW |
896 | } |
897 | ||
898 | /** | |
899 | * swsusp_write - Write entire image and metadata. | |
a634cc10 | 900 | * @flags: flags to pass to the "boot" kernel in the image header |
61159a31 RW |
901 | * |
902 | * It is important _NOT_ to umount filesystems at this point. We want | |
903 | * them synced (in case something goes wrong) but we DO not want to mark | |
904 | * filesystem clean: it is not. (And it does not matter, if we resume | |
905 | * correctly, we'll mark system clean, anyway.) | |
906 | */ | |
907 | ||
a634cc10 | 908 | int swsusp_write(unsigned int flags) |
61159a31 RW |
909 | { |
910 | struct swap_map_handle handle; | |
911 | struct snapshot_handle snapshot; | |
912 | struct swsusp_info *header; | |
6f612af5 | 913 | unsigned long pages; |
61159a31 RW |
914 | int error; |
915 | ||
6f612af5 JS |
916 | pages = snapshot_get_image_size(); |
917 | error = get_swap_writer(&handle); | |
3aef83e0 | 918 | if (error) { |
64ec72a1 | 919 | pr_err("Cannot get swap writer\n"); |
61159a31 RW |
920 | return error; |
921 | } | |
ee34a370 | 922 | if (flags & SF_NOCOMPRESS_MODE) { |
8ffdfe35 | 923 | if (!enough_swap(pages)) { |
64ec72a1 | 924 | pr_err("Not enough free swap\n"); |
ee34a370 BS |
925 | error = -ENOSPC; |
926 | goto out_finish; | |
927 | } | |
6f612af5 | 928 | } |
61159a31 | 929 | memset(&snapshot, 0, sizeof(struct snapshot_handle)); |
d3c1b24c | 930 | error = snapshot_read_next(&snapshot); |
d5641c64 | 931 | if (error < (int)PAGE_SIZE) { |
3aef83e0 RW |
932 | if (error >= 0) |
933 | error = -EFAULT; | |
934 | ||
6f612af5 | 935 | goto out_finish; |
3aef83e0 | 936 | } |
61159a31 | 937 | header = (struct swsusp_info *)data_of(snapshot); |
6f612af5 | 938 | error = swap_write_page(&handle, header, NULL); |
f996fc96 BS |
939 | if (!error) { |
940 | error = (flags & SF_NOCOMPRESS_MODE) ? | |
941 | save_image(&handle, &snapshot, pages - 1) : | |
942 | save_image_lzo(&handle, &snapshot, pages - 1); | |
943 | } | |
6f612af5 JS |
944 | out_finish: |
945 | error = swap_writer_finish(&handle, flags, error); | |
61159a31 RW |
946 | return error; |
947 | } | |
948 | ||
61159a31 RW |
949 | /** |
950 | * The following functions allow us to read data using a swap map | |
951 | * in a file-alike way | |
952 | */ | |
953 | ||
954 | static void release_swap_reader(struct swap_map_handle *handle) | |
955 | { | |
081a9d04 BS |
956 | struct swap_map_page_list *tmp; |
957 | ||
958 | while (handle->maps) { | |
959 | if (handle->maps->map) | |
960 | free_page((unsigned long)handle->maps->map); | |
961 | tmp = handle->maps; | |
962 | handle->maps = handle->maps->next; | |
963 | kfree(tmp); | |
964 | } | |
61159a31 RW |
965 | handle->cur = NULL; |
966 | } | |
967 | ||
6f612af5 JS |
968 | static int get_swap_reader(struct swap_map_handle *handle, |
969 | unsigned int *flags_p) | |
61159a31 RW |
970 | { |
971 | int error; | |
081a9d04 BS |
972 | struct swap_map_page_list *tmp, *last; |
973 | sector_t offset; | |
61159a31 | 974 | |
6f612af5 JS |
975 | *flags_p = swsusp_header->flags; |
976 | ||
977 | if (!swsusp_header->image) /* how can this happen? */ | |
61159a31 | 978 | return -EINVAL; |
3aef83e0 | 979 | |
081a9d04 BS |
980 | handle->cur = NULL; |
981 | last = handle->maps = NULL; | |
982 | offset = swsusp_header->image; | |
983 | while (offset) { | |
2f02a7ec | 984 | tmp = kzalloc(sizeof(*handle->maps), GFP_KERNEL); |
081a9d04 BS |
985 | if (!tmp) { |
986 | release_swap_reader(handle); | |
987 | return -ENOMEM; | |
988 | } | |
081a9d04 BS |
989 | if (!handle->maps) |
990 | handle->maps = tmp; | |
991 | if (last) | |
992 | last->next = tmp; | |
993 | last = tmp; | |
994 | ||
995 | tmp->map = (struct swap_map_page *) | |
0eb0b63c | 996 | __get_free_page(GFP_NOIO | __GFP_HIGH); |
081a9d04 BS |
997 | if (!tmp->map) { |
998 | release_swap_reader(handle); | |
999 | return -ENOMEM; | |
1000 | } | |
3aef83e0 | 1001 | |
70fd7614 | 1002 | error = hib_submit_io(REQ_OP_READ, 0, offset, tmp->map, NULL); |
081a9d04 BS |
1003 | if (error) { |
1004 | release_swap_reader(handle); | |
1005 | return error; | |
1006 | } | |
1007 | offset = tmp->map->next_swap; | |
61159a31 RW |
1008 | } |
1009 | handle->k = 0; | |
081a9d04 | 1010 | handle->cur = handle->maps->map; |
61159a31 RW |
1011 | return 0; |
1012 | } | |
1013 | ||
546e0d27 | 1014 | static int swap_read_page(struct swap_map_handle *handle, void *buf, |
343df3c7 | 1015 | struct hib_bio_batch *hb) |
61159a31 | 1016 | { |
3aef83e0 | 1017 | sector_t offset; |
61159a31 | 1018 | int error; |
081a9d04 | 1019 | struct swap_map_page_list *tmp; |
61159a31 RW |
1020 | |
1021 | if (!handle->cur) | |
1022 | return -EINVAL; | |
1023 | offset = handle->cur->entries[handle->k]; | |
1024 | if (!offset) | |
1025 | return -EFAULT; | |
70fd7614 | 1026 | error = hib_submit_io(REQ_OP_READ, 0, offset, buf, hb); |
61159a31 RW |
1027 | if (error) |
1028 | return error; | |
1029 | if (++handle->k >= MAP_PAGE_ENTRIES) { | |
1030 | handle->k = 0; | |
081a9d04 BS |
1031 | free_page((unsigned long)handle->maps->map); |
1032 | tmp = handle->maps; | |
1033 | handle->maps = handle->maps->next; | |
1034 | kfree(tmp); | |
1035 | if (!handle->maps) | |
61159a31 | 1036 | release_swap_reader(handle); |
081a9d04 BS |
1037 | else |
1038 | handle->cur = handle->maps->map; | |
61159a31 RW |
1039 | } |
1040 | return error; | |
1041 | } | |
1042 | ||
6f612af5 JS |
1043 | static int swap_reader_finish(struct swap_map_handle *handle) |
1044 | { | |
1045 | release_swap_reader(handle); | |
1046 | ||
1047 | return 0; | |
1048 | } | |
1049 | ||
61159a31 RW |
1050 | /** |
1051 | * load_image - load the image using the swap map handle | |
1052 | * @handle and the snapshot handle @snapshot | |
1053 | * (assume there are @nr_pages pages to load) | |
1054 | */ | |
1055 | ||
1056 | static int load_image(struct swap_map_handle *handle, | |
1057 | struct snapshot_handle *snapshot, | |
546e0d27 | 1058 | unsigned int nr_to_read) |
61159a31 RW |
1059 | { |
1060 | unsigned int m; | |
081a9d04 | 1061 | int ret = 0; |
db597605 TR |
1062 | ktime_t start; |
1063 | ktime_t stop; | |
343df3c7 | 1064 | struct hib_bio_batch hb; |
546e0d27 AM |
1065 | int err2; |
1066 | unsigned nr_pages; | |
61159a31 | 1067 | |
343df3c7 CH |
1068 | hib_init_batch(&hb); |
1069 | ||
f6cf0545 | 1070 | clean_pages_on_read = true; |
64ec72a1 | 1071 | pr_info("Loading image data pages (%u pages)...\n", nr_to_read); |
d8150d35 | 1072 | m = nr_to_read / 10; |
61159a31 RW |
1073 | if (!m) |
1074 | m = 1; | |
1075 | nr_pages = 0; | |
db597605 | 1076 | start = ktime_get(); |
546e0d27 | 1077 | for ( ; ; ) { |
081a9d04 BS |
1078 | ret = snapshot_write_next(snapshot); |
1079 | if (ret <= 0) | |
546e0d27 | 1080 | break; |
343df3c7 | 1081 | ret = swap_read_page(handle, data_of(*snapshot), &hb); |
081a9d04 | 1082 | if (ret) |
546e0d27 AM |
1083 | break; |
1084 | if (snapshot->sync_read) | |
343df3c7 | 1085 | ret = hib_wait_io(&hb); |
081a9d04 | 1086 | if (ret) |
546e0d27 AM |
1087 | break; |
1088 | if (!(nr_pages % m)) | |
64ec72a1 JP |
1089 | pr_info("Image loading progress: %3d%%\n", |
1090 | nr_pages / m * 10); | |
546e0d27 AM |
1091 | nr_pages++; |
1092 | } | |
343df3c7 | 1093 | err2 = hib_wait_io(&hb); |
55c4478a | 1094 | hib_finish_batch(&hb); |
db597605 | 1095 | stop = ktime_get(); |
081a9d04 BS |
1096 | if (!ret) |
1097 | ret = err2; | |
1098 | if (!ret) { | |
64ec72a1 | 1099 | pr_info("Image loading done\n"); |
8357376d | 1100 | snapshot_write_finalize(snapshot); |
e655a250 | 1101 | if (!snapshot_image_loaded(snapshot)) |
081a9d04 | 1102 | ret = -ENODATA; |
d8150d35 | 1103 | } |
db597605 | 1104 | swsusp_show_speed(start, stop, nr_to_read, "Read"); |
081a9d04 BS |
1105 | return ret; |
1106 | } | |
1107 | ||
1108 | /** | |
1109 | * Structure used for LZO data decompression. | |
1110 | */ | |
1111 | struct dec_data { | |
1112 | struct task_struct *thr; /* thread */ | |
1113 | atomic_t ready; /* ready to start flag */ | |
1114 | atomic_t stop; /* ready to stop flag */ | |
1115 | int ret; /* return code */ | |
1116 | wait_queue_head_t go; /* start decompression */ | |
1117 | wait_queue_head_t done; /* decompression done */ | |
1118 | size_t unc_len; /* uncompressed length */ | |
1119 | size_t cmp_len; /* compressed length */ | |
1120 | unsigned char unc[LZO_UNC_SIZE]; /* uncompressed buffer */ | |
1121 | unsigned char cmp[LZO_CMP_SIZE]; /* compressed buffer */ | |
1122 | }; | |
1123 | ||
1124 | /** | |
6be2408a | 1125 | * Decompression function that runs in its own thread. |
081a9d04 BS |
1126 | */ |
1127 | static int lzo_decompress_threadfn(void *data) | |
1128 | { | |
1129 | struct dec_data *d = data; | |
1130 | ||
1131 | while (1) { | |
1132 | wait_event(d->go, atomic_read(&d->ready) || | |
1133 | kthread_should_stop()); | |
1134 | if (kthread_should_stop()) { | |
1135 | d->thr = NULL; | |
1136 | d->ret = -1; | |
1137 | atomic_set(&d->stop, 1); | |
1138 | wake_up(&d->done); | |
1139 | break; | |
1140 | } | |
1141 | atomic_set(&d->ready, 0); | |
1142 | ||
1143 | d->unc_len = LZO_UNC_SIZE; | |
1144 | d->ret = lzo1x_decompress_safe(d->cmp + LZO_HEADER, d->cmp_len, | |
1145 | d->unc, &d->unc_len); | |
f6cf0545 JM |
1146 | if (clean_pages_on_decompress) |
1147 | flush_icache_range((unsigned long)d->unc, | |
1148 | (unsigned long)d->unc + d->unc_len); | |
1149 | ||
081a9d04 BS |
1150 | atomic_set(&d->stop, 1); |
1151 | wake_up(&d->done); | |
1152 | } | |
1153 | return 0; | |
61159a31 RW |
1154 | } |
1155 | ||
f996fc96 BS |
1156 | /** |
1157 | * load_image_lzo - Load compressed image data and decompress them with LZO. | |
1158 | * @handle: Swap map handle to use for loading data. | |
1159 | * @snapshot: Image to copy uncompressed data into. | |
1160 | * @nr_to_read: Number of pages to load. | |
1161 | */ | |
1162 | static int load_image_lzo(struct swap_map_handle *handle, | |
1163 | struct snapshot_handle *snapshot, | |
1164 | unsigned int nr_to_read) | |
1165 | { | |
1166 | unsigned int m; | |
081a9d04 BS |
1167 | int ret = 0; |
1168 | int eof = 0; | |
343df3c7 | 1169 | struct hib_bio_batch hb; |
db597605 TR |
1170 | ktime_t start; |
1171 | ktime_t stop; | |
f996fc96 | 1172 | unsigned nr_pages; |
081a9d04 BS |
1173 | size_t off; |
1174 | unsigned i, thr, run_threads, nr_threads; | |
1175 | unsigned ring = 0, pg = 0, ring_size = 0, | |
1176 | have = 0, want, need, asked = 0; | |
5a21d489 | 1177 | unsigned long read_pages = 0; |
081a9d04 BS |
1178 | unsigned char **page = NULL; |
1179 | struct dec_data *data = NULL; | |
1180 | struct crc_data *crc = NULL; | |
1181 | ||
343df3c7 CH |
1182 | hib_init_batch(&hb); |
1183 | ||
081a9d04 BS |
1184 | /* |
1185 | * We'll limit the number of threads for decompression to limit memory | |
1186 | * footprint. | |
1187 | */ | |
1188 | nr_threads = num_online_cpus() - 1; | |
1189 | nr_threads = clamp_val(nr_threads, 1, LZO_THREADS); | |
1190 | ||
42bc47b3 | 1191 | page = vmalloc(array_size(LZO_MAX_RD_PAGES, sizeof(*page))); |
081a9d04 | 1192 | if (!page) { |
64ec72a1 | 1193 | pr_err("Failed to allocate LZO page\n"); |
081a9d04 BS |
1194 | ret = -ENOMEM; |
1195 | goto out_clean; | |
1196 | } | |
9f339caf | 1197 | |
9437e393 | 1198 | data = vzalloc(array_size(nr_threads, sizeof(*data))); |
081a9d04 | 1199 | if (!data) { |
64ec72a1 | 1200 | pr_err("Failed to allocate LZO data\n"); |
081a9d04 BS |
1201 | ret = -ENOMEM; |
1202 | goto out_clean; | |
1203 | } | |
9f339caf | 1204 | |
9437e393 | 1205 | crc = kzalloc(sizeof(*crc), GFP_KERNEL); |
081a9d04 | 1206 | if (!crc) { |
64ec72a1 | 1207 | pr_err("Failed to allocate crc\n"); |
081a9d04 BS |
1208 | ret = -ENOMEM; |
1209 | goto out_clean; | |
1210 | } | |
081a9d04 | 1211 | |
f6cf0545 JM |
1212 | clean_pages_on_decompress = true; |
1213 | ||
081a9d04 BS |
1214 | /* |
1215 | * Start the decompression threads. | |
1216 | */ | |
1217 | for (thr = 0; thr < nr_threads; thr++) { | |
1218 | init_waitqueue_head(&data[thr].go); | |
1219 | init_waitqueue_head(&data[thr].done); | |
1220 | ||
1221 | data[thr].thr = kthread_run(lzo_decompress_threadfn, | |
1222 | &data[thr], | |
1223 | "image_decompress/%u", thr); | |
1224 | if (IS_ERR(data[thr].thr)) { | |
1225 | data[thr].thr = NULL; | |
64ec72a1 | 1226 | pr_err("Cannot start decompression threads\n"); |
081a9d04 BS |
1227 | ret = -ENOMEM; |
1228 | goto out_clean; | |
9f339caf | 1229 | } |
f996fc96 BS |
1230 | } |
1231 | ||
081a9d04 BS |
1232 | /* |
1233 | * Start the CRC32 thread. | |
1234 | */ | |
1235 | init_waitqueue_head(&crc->go); | |
1236 | init_waitqueue_head(&crc->done); | |
1237 | ||
1238 | handle->crc32 = 0; | |
1239 | crc->crc32 = &handle->crc32; | |
1240 | for (thr = 0; thr < nr_threads; thr++) { | |
1241 | crc->unc[thr] = data[thr].unc; | |
1242 | crc->unc_len[thr] = &data[thr].unc_len; | |
f996fc96 BS |
1243 | } |
1244 | ||
081a9d04 BS |
1245 | crc->thr = kthread_run(crc32_threadfn, crc, "image_crc32"); |
1246 | if (IS_ERR(crc->thr)) { | |
1247 | crc->thr = NULL; | |
64ec72a1 | 1248 | pr_err("Cannot start CRC32 thread\n"); |
081a9d04 BS |
1249 | ret = -ENOMEM; |
1250 | goto out_clean; | |
1251 | } | |
9f339caf | 1252 | |
081a9d04 | 1253 | /* |
5a21d489 BS |
1254 | * Set the number of pages for read buffering. |
1255 | * This is complete guesswork, because we'll only know the real | |
1256 | * picture once prepare_image() is called, which is much later on | |
1257 | * during the image load phase. We'll assume the worst case and | |
1258 | * say that none of the image pages are from high memory. | |
081a9d04 | 1259 | */ |
5a21d489 BS |
1260 | if (low_free_pages() > snapshot_get_image_size()) |
1261 | read_pages = (low_free_pages() - snapshot_get_image_size()) / 2; | |
1262 | read_pages = clamp_val(read_pages, LZO_MIN_RD_PAGES, LZO_MAX_RD_PAGES); | |
9f339caf | 1263 | |
081a9d04 BS |
1264 | for (i = 0; i < read_pages; i++) { |
1265 | page[i] = (void *)__get_free_page(i < LZO_CMP_PAGES ? | |
0eb0b63c CH |
1266 | GFP_NOIO | __GFP_HIGH : |
1267 | GFP_NOIO | __GFP_NOWARN | | |
71baba4b | 1268 | __GFP_NORETRY); |
5a21d489 | 1269 | |
081a9d04 BS |
1270 | if (!page[i]) { |
1271 | if (i < LZO_CMP_PAGES) { | |
1272 | ring_size = i; | |
64ec72a1 | 1273 | pr_err("Failed to allocate LZO pages\n"); |
081a9d04 BS |
1274 | ret = -ENOMEM; |
1275 | goto out_clean; | |
1276 | } else { | |
1277 | break; | |
1278 | } | |
1279 | } | |
f996fc96 | 1280 | } |
081a9d04 | 1281 | want = ring_size = i; |
f996fc96 | 1282 | |
64ec72a1 JP |
1283 | pr_info("Using %u thread(s) for decompression\n", nr_threads); |
1284 | pr_info("Loading and decompressing image data (%u pages)...\n", | |
1285 | nr_to_read); | |
d8150d35 | 1286 | m = nr_to_read / 10; |
f996fc96 BS |
1287 | if (!m) |
1288 | m = 1; | |
1289 | nr_pages = 0; | |
db597605 | 1290 | start = ktime_get(); |
f996fc96 | 1291 | |
081a9d04 BS |
1292 | ret = snapshot_write_next(snapshot); |
1293 | if (ret <= 0) | |
f996fc96 BS |
1294 | goto out_finish; |
1295 | ||
081a9d04 BS |
1296 | for(;;) { |
1297 | for (i = 0; !eof && i < want; i++) { | |
343df3c7 | 1298 | ret = swap_read_page(handle, page[ring], &hb); |
081a9d04 BS |
1299 | if (ret) { |
1300 | /* | |
1301 | * On real read error, finish. On end of data, | |
1302 | * set EOF flag and just exit the read loop. | |
1303 | */ | |
1304 | if (handle->cur && | |
1305 | handle->cur->entries[handle->k]) { | |
1306 | goto out_finish; | |
1307 | } else { | |
1308 | eof = 1; | |
1309 | break; | |
1310 | } | |
1311 | } | |
1312 | if (++ring >= ring_size) | |
1313 | ring = 0; | |
f996fc96 | 1314 | } |
081a9d04 BS |
1315 | asked += i; |
1316 | want -= i; | |
f996fc96 | 1317 | |
081a9d04 BS |
1318 | /* |
1319 | * We are out of data, wait for some more. | |
1320 | */ | |
1321 | if (!have) { | |
1322 | if (!asked) | |
1323 | break; | |
1324 | ||
343df3c7 | 1325 | ret = hib_wait_io(&hb); |
081a9d04 | 1326 | if (ret) |
f996fc96 | 1327 | goto out_finish; |
081a9d04 BS |
1328 | have += asked; |
1329 | asked = 0; | |
1330 | if (eof) | |
1331 | eof = 2; | |
9f339caf | 1332 | } |
f996fc96 | 1333 | |
081a9d04 BS |
1334 | if (crc->run_threads) { |
1335 | wait_event(crc->done, atomic_read(&crc->stop)); | |
1336 | atomic_set(&crc->stop, 0); | |
1337 | crc->run_threads = 0; | |
f996fc96 BS |
1338 | } |
1339 | ||
081a9d04 BS |
1340 | for (thr = 0; have && thr < nr_threads; thr++) { |
1341 | data[thr].cmp_len = *(size_t *)page[pg]; | |
1342 | if (unlikely(!data[thr].cmp_len || | |
1343 | data[thr].cmp_len > | |
1344 | lzo1x_worst_compress(LZO_UNC_SIZE))) { | |
64ec72a1 | 1345 | pr_err("Invalid LZO compressed length\n"); |
081a9d04 BS |
1346 | ret = -1; |
1347 | goto out_finish; | |
1348 | } | |
1349 | ||
1350 | need = DIV_ROUND_UP(data[thr].cmp_len + LZO_HEADER, | |
1351 | PAGE_SIZE); | |
1352 | if (need > have) { | |
1353 | if (eof > 1) { | |
1354 | ret = -1; | |
1355 | goto out_finish; | |
1356 | } | |
1357 | break; | |
1358 | } | |
1359 | ||
1360 | for (off = 0; | |
1361 | off < LZO_HEADER + data[thr].cmp_len; | |
1362 | off += PAGE_SIZE) { | |
1363 | memcpy(data[thr].cmp + off, | |
1364 | page[pg], PAGE_SIZE); | |
1365 | have--; | |
1366 | want++; | |
1367 | if (++pg >= ring_size) | |
1368 | pg = 0; | |
1369 | } | |
1370 | ||
1371 | atomic_set(&data[thr].ready, 1); | |
1372 | wake_up(&data[thr].go); | |
f996fc96 BS |
1373 | } |
1374 | ||
081a9d04 BS |
1375 | /* |
1376 | * Wait for more data while we are decompressing. | |
1377 | */ | |
1378 | if (have < LZO_CMP_PAGES && asked) { | |
343df3c7 | 1379 | ret = hib_wait_io(&hb); |
081a9d04 BS |
1380 | if (ret) |
1381 | goto out_finish; | |
1382 | have += asked; | |
1383 | asked = 0; | |
1384 | if (eof) | |
1385 | eof = 2; | |
f996fc96 BS |
1386 | } |
1387 | ||
081a9d04 BS |
1388 | for (run_threads = thr, thr = 0; thr < run_threads; thr++) { |
1389 | wait_event(data[thr].done, | |
1390 | atomic_read(&data[thr].stop)); | |
1391 | atomic_set(&data[thr].stop, 0); | |
1392 | ||
1393 | ret = data[thr].ret; | |
f996fc96 | 1394 | |
081a9d04 | 1395 | if (ret < 0) { |
64ec72a1 | 1396 | pr_err("LZO decompression failed\n"); |
081a9d04 BS |
1397 | goto out_finish; |
1398 | } | |
f996fc96 | 1399 | |
081a9d04 BS |
1400 | if (unlikely(!data[thr].unc_len || |
1401 | data[thr].unc_len > LZO_UNC_SIZE || | |
1402 | data[thr].unc_len & (PAGE_SIZE - 1))) { | |
64ec72a1 | 1403 | pr_err("Invalid LZO uncompressed length\n"); |
081a9d04 | 1404 | ret = -1; |
f996fc96 | 1405 | goto out_finish; |
081a9d04 BS |
1406 | } |
1407 | ||
1408 | for (off = 0; | |
1409 | off < data[thr].unc_len; off += PAGE_SIZE) { | |
1410 | memcpy(data_of(*snapshot), | |
1411 | data[thr].unc + off, PAGE_SIZE); | |
1412 | ||
1413 | if (!(nr_pages % m)) | |
64ec72a1 JP |
1414 | pr_info("Image loading progress: %3d%%\n", |
1415 | nr_pages / m * 10); | |
081a9d04 BS |
1416 | nr_pages++; |
1417 | ||
1418 | ret = snapshot_write_next(snapshot); | |
1419 | if (ret <= 0) { | |
1420 | crc->run_threads = thr + 1; | |
1421 | atomic_set(&crc->ready, 1); | |
1422 | wake_up(&crc->go); | |
1423 | goto out_finish; | |
1424 | } | |
1425 | } | |
f996fc96 | 1426 | } |
081a9d04 BS |
1427 | |
1428 | crc->run_threads = thr; | |
1429 | atomic_set(&crc->ready, 1); | |
1430 | wake_up(&crc->go); | |
f996fc96 BS |
1431 | } |
1432 | ||
1433 | out_finish: | |
081a9d04 BS |
1434 | if (crc->run_threads) { |
1435 | wait_event(crc->done, atomic_read(&crc->stop)); | |
1436 | atomic_set(&crc->stop, 0); | |
1437 | } | |
db597605 | 1438 | stop = ktime_get(); |
081a9d04 | 1439 | if (!ret) { |
64ec72a1 | 1440 | pr_info("Image loading done\n"); |
f996fc96 BS |
1441 | snapshot_write_finalize(snapshot); |
1442 | if (!snapshot_image_loaded(snapshot)) | |
081a9d04 BS |
1443 | ret = -ENODATA; |
1444 | if (!ret) { | |
1445 | if (swsusp_header->flags & SF_CRC32_MODE) { | |
1446 | if(handle->crc32 != swsusp_header->crc32) { | |
64ec72a1 | 1447 | pr_err("Invalid image CRC32!\n"); |
081a9d04 BS |
1448 | ret = -ENODATA; |
1449 | } | |
1450 | } | |
1451 | } | |
d8150d35 | 1452 | } |
db597605 | 1453 | swsusp_show_speed(start, stop, nr_to_read, "Read"); |
081a9d04 | 1454 | out_clean: |
55c4478a | 1455 | hib_finish_batch(&hb); |
081a9d04 | 1456 | for (i = 0; i < ring_size; i++) |
9f339caf | 1457 | free_page((unsigned long)page[i]); |
081a9d04 BS |
1458 | if (crc) { |
1459 | if (crc->thr) | |
1460 | kthread_stop(crc->thr); | |
1461 | kfree(crc); | |
1462 | } | |
1463 | if (data) { | |
1464 | for (thr = 0; thr < nr_threads; thr++) | |
1465 | if (data[thr].thr) | |
1466 | kthread_stop(data[thr].thr); | |
1467 | vfree(data); | |
1468 | } | |
6c45de0d | 1469 | vfree(page); |
f996fc96 | 1470 | |
081a9d04 | 1471 | return ret; |
f996fc96 BS |
1472 | } |
1473 | ||
a634cc10 RW |
1474 | /** |
1475 | * swsusp_read - read the hibernation image. | |
1476 | * @flags_p: flags passed by the "frozen" kernel in the image header should | |
b595076a | 1477 | * be written into this memory location |
a634cc10 RW |
1478 | */ |
1479 | ||
1480 | int swsusp_read(unsigned int *flags_p) | |
61159a31 RW |
1481 | { |
1482 | int error; | |
1483 | struct swap_map_handle handle; | |
1484 | struct snapshot_handle snapshot; | |
1485 | struct swsusp_info *header; | |
1486 | ||
61159a31 | 1487 | memset(&snapshot, 0, sizeof(struct snapshot_handle)); |
d3c1b24c | 1488 | error = snapshot_write_next(&snapshot); |
d5641c64 | 1489 | if (error < (int)PAGE_SIZE) |
61159a31 RW |
1490 | return error < 0 ? error : -EFAULT; |
1491 | header = (struct swsusp_info *)data_of(snapshot); | |
6f612af5 JS |
1492 | error = get_swap_reader(&handle, flags_p); |
1493 | if (error) | |
1494 | goto end; | |
61159a31 | 1495 | if (!error) |
546e0d27 | 1496 | error = swap_read_page(&handle, header, NULL); |
f996fc96 BS |
1497 | if (!error) { |
1498 | error = (*flags_p & SF_NOCOMPRESS_MODE) ? | |
1499 | load_image(&handle, &snapshot, header->pages - 1) : | |
1500 | load_image_lzo(&handle, &snapshot, header->pages - 1); | |
1501 | } | |
6f612af5 JS |
1502 | swap_reader_finish(&handle); |
1503 | end: | |
61159a31 | 1504 | if (!error) |
64ec72a1 | 1505 | pr_debug("Image successfully loaded\n"); |
61159a31 | 1506 | else |
64ec72a1 | 1507 | pr_debug("Error %d resuming\n", error); |
61159a31 RW |
1508 | return error; |
1509 | } | |
1510 | ||
1511 | /** | |
1512 | * swsusp_check - Check for swsusp signature in the resume device | |
1513 | */ | |
1514 | ||
1515 | int swsusp_check(void) | |
1516 | { | |
1517 | int error; | |
1518 | ||
d4d77629 TH |
1519 | hib_resume_bdev = blkdev_get_by_dev(swsusp_resume_device, |
1520 | FMODE_READ, NULL); | |
8a0d613f JS |
1521 | if (!IS_ERR(hib_resume_bdev)) { |
1522 | set_blocksize(hib_resume_bdev, PAGE_SIZE); | |
3ecb01df | 1523 | clear_page(swsusp_header); |
70fd7614 | 1524 | error = hib_submit_io(REQ_OP_READ, 0, |
162b99e3 | 1525 | swsusp_resume_block, |
1b29c164 | 1526 | swsusp_header, NULL); |
9a154d9d | 1527 | if (error) |
76b57e61 | 1528 | goto put; |
9a154d9d | 1529 | |
3624eb04 | 1530 | if (!memcmp(HIBERNATE_SIG, swsusp_header->sig, 10)) { |
1b29c164 | 1531 | memcpy(swsusp_header->sig, swsusp_header->orig_sig, 10); |
61159a31 | 1532 | /* Reset swap signature now */ |
70fd7614 | 1533 | error = hib_submit_io(REQ_OP_WRITE, REQ_SYNC, |
162b99e3 | 1534 | swsusp_resume_block, |
1b29c164 | 1535 | swsusp_header, NULL); |
61159a31 | 1536 | } else { |
76b57e61 | 1537 | error = -EINVAL; |
61159a31 | 1538 | } |
76b57e61 JS |
1539 | |
1540 | put: | |
61159a31 | 1541 | if (error) |
8a0d613f | 1542 | blkdev_put(hib_resume_bdev, FMODE_READ); |
61159a31 | 1543 | else |
64ec72a1 | 1544 | pr_debug("Image signature found, resuming\n"); |
61159a31 | 1545 | } else { |
8a0d613f | 1546 | error = PTR_ERR(hib_resume_bdev); |
61159a31 RW |
1547 | } |
1548 | ||
1549 | if (error) | |
64ec72a1 | 1550 | pr_debug("Image not found (code %d)\n", error); |
61159a31 RW |
1551 | |
1552 | return error; | |
1553 | } | |
1554 | ||
1555 | /** | |
1556 | * swsusp_close - close swap device. | |
1557 | */ | |
1558 | ||
c2dd0dae | 1559 | void swsusp_close(fmode_t mode) |
61159a31 | 1560 | { |
8a0d613f | 1561 | if (IS_ERR(hib_resume_bdev)) { |
64ec72a1 | 1562 | pr_debug("Image device not initialised\n"); |
61159a31 RW |
1563 | return; |
1564 | } | |
1565 | ||
8a0d613f | 1566 | blkdev_put(hib_resume_bdev, mode); |
61159a31 | 1567 | } |
1b29c164 | 1568 | |
62c552cc BS |
1569 | /** |
1570 | * swsusp_unmark - Unmark swsusp signature in the resume device | |
1571 | */ | |
1572 | ||
1573 | #ifdef CONFIG_SUSPEND | |
1574 | int swsusp_unmark(void) | |
1575 | { | |
1576 | int error; | |
1577 | ||
70fd7614 | 1578 | hib_submit_io(REQ_OP_READ, 0, swsusp_resume_block, |
162b99e3 | 1579 | swsusp_header, NULL); |
62c552cc BS |
1580 | if (!memcmp(HIBERNATE_SIG,swsusp_header->sig, 10)) { |
1581 | memcpy(swsusp_header->sig,swsusp_header->orig_sig, 10); | |
70fd7614 | 1582 | error = hib_submit_io(REQ_OP_WRITE, REQ_SYNC, |
162b99e3 | 1583 | swsusp_resume_block, |
62c552cc BS |
1584 | swsusp_header, NULL); |
1585 | } else { | |
64ec72a1 | 1586 | pr_err("Cannot find swsusp signature!\n"); |
62c552cc BS |
1587 | error = -ENODEV; |
1588 | } | |
1589 | ||
1590 | /* | |
1591 | * We just returned from suspend, we don't need the image any more. | |
1592 | */ | |
1593 | free_all_swap_pages(root_swap); | |
1594 | ||
1595 | return error; | |
1596 | } | |
1597 | #endif | |
1598 | ||
afd8d7c7 | 1599 | static int __init swsusp_header_init(void) |
1b29c164 VG |
1600 | { |
1601 | swsusp_header = (struct swsusp_header*) __get_free_page(GFP_KERNEL); | |
1602 | if (!swsusp_header) | |
1603 | panic("Could not allocate memory for swsusp_header\n"); | |
1604 | return 0; | |
1605 | } | |
1606 | ||
1607 | core_initcall(swsusp_header_init); |