Commit | Line | Data |
---|---|---|
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; |
343df3c7 CH |
229 | }; |
230 | ||
231 | static void hib_init_batch(struct hib_bio_batch *hb) | |
232 | { | |
233 | atomic_set(&hb->count, 0); | |
234 | init_waitqueue_head(&hb->wait); | |
4e4cbee9 | 235 | hb->error = BLK_STS_OK; |
343df3c7 CH |
236 | } |
237 | ||
4246a0b6 | 238 | static void hib_end_io(struct bio *bio) |
343df3c7 CH |
239 | { |
240 | struct hib_bio_batch *hb = bio->bi_private; | |
263663cd | 241 | struct page *page = bio_first_page_all(bio); |
343df3c7 | 242 | |
4e4cbee9 | 243 | if (bio->bi_status) { |
64ec72a1 JP |
244 | pr_alert("Read-error on swap-device (%u:%u:%Lu)\n", |
245 | MAJOR(bio_dev(bio)), MINOR(bio_dev(bio)), | |
246 | (unsigned long long)bio->bi_iter.bi_sector); | |
343df3c7 CH |
247 | } |
248 | ||
249 | if (bio_data_dir(bio) == WRITE) | |
250 | put_page(page); | |
f6cf0545 JM |
251 | else if (clean_pages_on_read) |
252 | flush_icache_range((unsigned long)page_address(page), | |
253 | (unsigned long)page_address(page) + PAGE_SIZE); | |
343df3c7 | 254 | |
4e4cbee9 CH |
255 | if (bio->bi_status && !hb->error) |
256 | hb->error = bio->bi_status; | |
343df3c7 CH |
257 | if (atomic_dec_and_test(&hb->count)) |
258 | wake_up(&hb->wait); | |
259 | ||
260 | bio_put(bio); | |
261 | } | |
262 | ||
162b99e3 | 263 | static int hib_submit_io(int op, int op_flags, pgoff_t page_off, void *addr, |
343df3c7 CH |
264 | struct hib_bio_batch *hb) |
265 | { | |
266 | struct page *page = virt_to_page(addr); | |
267 | struct bio *bio; | |
268 | int error = 0; | |
269 | ||
0eb0b63c | 270 | bio = bio_alloc(GFP_NOIO | __GFP_HIGH, 1); |
343df3c7 | 271 | bio->bi_iter.bi_sector = page_off * (PAGE_SIZE >> 9); |
74d46992 | 272 | bio_set_dev(bio, hib_resume_bdev); |
162b99e3 | 273 | bio_set_op_attrs(bio, op, op_flags); |
343df3c7 CH |
274 | |
275 | if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) { | |
64ec72a1 JP |
276 | pr_err("Adding page to bio failed at %llu\n", |
277 | (unsigned long long)bio->bi_iter.bi_sector); | |
343df3c7 CH |
278 | bio_put(bio); |
279 | return -EFAULT; | |
280 | } | |
281 | ||
282 | if (hb) { | |
283 | bio->bi_end_io = hib_end_io; | |
284 | bio->bi_private = hb; | |
285 | atomic_inc(&hb->count); | |
4e49ea4a | 286 | submit_bio(bio); |
343df3c7 | 287 | } else { |
4e49ea4a | 288 | error = submit_bio_wait(bio); |
343df3c7 CH |
289 | bio_put(bio); |
290 | } | |
291 | ||
292 | return error; | |
293 | } | |
294 | ||
4e4cbee9 | 295 | static blk_status_t hib_wait_io(struct hib_bio_batch *hb) |
343df3c7 CH |
296 | { |
297 | wait_event(hb->wait, atomic_read(&hb->count) == 0); | |
4e4cbee9 | 298 | return blk_status_to_errno(hb->error); |
343df3c7 | 299 | } |
3fc6b34f | 300 | |
3fc6b34f RW |
301 | /* |
302 | * Saving part | |
303 | */ | |
61159a31 | 304 | |
51fb352b | 305 | static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags) |
61159a31 RW |
306 | { |
307 | int error; | |
308 | ||
70fd7614 | 309 | hib_submit_io(REQ_OP_READ, 0, swsusp_resume_block, |
162b99e3 | 310 | swsusp_header, NULL); |
1b29c164 VG |
311 | if (!memcmp("SWAP-SPACE",swsusp_header->sig, 10) || |
312 | !memcmp("SWAPSPACE2",swsusp_header->sig, 10)) { | |
313 | memcpy(swsusp_header->orig_sig,swsusp_header->sig, 10); | |
3624eb04 | 314 | memcpy(swsusp_header->sig, HIBERNATE_SIG, 10); |
51fb352b | 315 | swsusp_header->image = handle->first_sector; |
a634cc10 | 316 | swsusp_header->flags = flags; |
081a9d04 BS |
317 | if (flags & SF_CRC32_MODE) |
318 | swsusp_header->crc32 = handle->crc32; | |
70fd7614 | 319 | error = hib_submit_io(REQ_OP_WRITE, REQ_SYNC, |
162b99e3 | 320 | swsusp_resume_block, swsusp_header, NULL); |
61159a31 | 321 | } else { |
64ec72a1 | 322 | pr_err("Swap header not found!\n"); |
61159a31 RW |
323 | error = -ENODEV; |
324 | } | |
325 | return error; | |
326 | } | |
327 | ||
328 | /** | |
329 | * swsusp_swap_check - check if the resume device is a swap device | |
330 | * and get its index (if so) | |
6f612af5 JS |
331 | * |
332 | * This is called before saving image | |
61159a31 | 333 | */ |
6f612af5 | 334 | static int swsusp_swap_check(void) |
61159a31 | 335 | { |
3aef83e0 RW |
336 | int res; |
337 | ||
7bf23687 | 338 | res = swap_type_of(swsusp_resume_device, swsusp_resume_block, |
8a0d613f | 339 | &hib_resume_bdev); |
3aef83e0 RW |
340 | if (res < 0) |
341 | return res; | |
342 | ||
343 | root_swap = res; | |
e525fd89 | 344 | res = blkdev_get(hib_resume_bdev, FMODE_WRITE, NULL); |
7bf23687 RW |
345 | if (res) |
346 | return res; | |
3aef83e0 | 347 | |
8a0d613f | 348 | res = set_blocksize(hib_resume_bdev, PAGE_SIZE); |
3aef83e0 | 349 | if (res < 0) |
8a0d613f | 350 | blkdev_put(hib_resume_bdev, FMODE_WRITE); |
61159a31 | 351 | |
fe12c00d CY |
352 | /* |
353 | * Update the resume device to the one actually used, | |
354 | * so the test_resume mode can use it in case it is | |
355 | * invoked from hibernate() to test the snapshot. | |
356 | */ | |
357 | swsusp_resume_device = hib_resume_bdev->bd_dev; | |
61159a31 RW |
358 | return res; |
359 | } | |
360 | ||
361 | /** | |
362 | * write_page - Write one page to given swap location. | |
363 | * @buf: Address we're writing. | |
364 | * @offset: Offset of the swap page we're writing to. | |
343df3c7 | 365 | * @hb: bio completion batch |
61159a31 RW |
366 | */ |
367 | ||
343df3c7 | 368 | static int write_page(void *buf, sector_t offset, struct hib_bio_batch *hb) |
61159a31 | 369 | { |
3aef83e0 | 370 | void *src; |
081a9d04 | 371 | int ret; |
3aef83e0 RW |
372 | |
373 | if (!offset) | |
374 | return -ENOSPC; | |
375 | ||
343df3c7 | 376 | if (hb) { |
0eb0b63c | 377 | src = (void *)__get_free_page(GFP_NOIO | __GFP_NOWARN | |
5a21d489 | 378 | __GFP_NORETRY); |
3aef83e0 | 379 | if (src) { |
3ecb01df | 380 | copy_page(src, buf); |
3aef83e0 | 381 | } else { |
343df3c7 | 382 | ret = hib_wait_io(hb); /* Free pages */ |
081a9d04 BS |
383 | if (ret) |
384 | return ret; | |
0eb0b63c | 385 | src = (void *)__get_free_page(GFP_NOIO | |
5a21d489 BS |
386 | __GFP_NOWARN | |
387 | __GFP_NORETRY); | |
081a9d04 BS |
388 | if (src) { |
389 | copy_page(src, buf); | |
390 | } else { | |
391 | WARN_ON_ONCE(1); | |
343df3c7 | 392 | hb = NULL; /* Go synchronous */ |
081a9d04 BS |
393 | src = buf; |
394 | } | |
ab954160 | 395 | } |
3aef83e0 RW |
396 | } else { |
397 | src = buf; | |
61159a31 | 398 | } |
70fd7614 | 399 | return hib_submit_io(REQ_OP_WRITE, REQ_SYNC, offset, src, hb); |
61159a31 RW |
400 | } |
401 | ||
61159a31 RW |
402 | static void release_swap_writer(struct swap_map_handle *handle) |
403 | { | |
404 | if (handle->cur) | |
405 | free_page((unsigned long)handle->cur); | |
406 | handle->cur = NULL; | |
61159a31 RW |
407 | } |
408 | ||
409 | static int get_swap_writer(struct swap_map_handle *handle) | |
410 | { | |
6f612af5 JS |
411 | int ret; |
412 | ||
413 | ret = swsusp_swap_check(); | |
414 | if (ret) { | |
415 | if (ret != -ENOSPC) | |
64ec72a1 | 416 | pr_err("Cannot find swap device, try swapon -a\n"); |
6f612af5 JS |
417 | return ret; |
418 | } | |
61159a31 | 419 | handle->cur = (struct swap_map_page *)get_zeroed_page(GFP_KERNEL); |
6f612af5 JS |
420 | if (!handle->cur) { |
421 | ret = -ENOMEM; | |
422 | goto err_close; | |
423 | } | |
d1d241cc | 424 | handle->cur_swap = alloc_swapdev_block(root_swap); |
61159a31 | 425 | if (!handle->cur_swap) { |
6f612af5 JS |
426 | ret = -ENOSPC; |
427 | goto err_rel; | |
61159a31 RW |
428 | } |
429 | handle->k = 0; | |
f8262d47 | 430 | handle->reqd_free_pages = reqd_free_pages(); |
51fb352b | 431 | handle->first_sector = handle->cur_swap; |
61159a31 | 432 | return 0; |
6f612af5 JS |
433 | err_rel: |
434 | release_swap_writer(handle); | |
435 | err_close: | |
436 | swsusp_close(FMODE_WRITE); | |
437 | return ret; | |
61159a31 RW |
438 | } |
439 | ||
ab954160 | 440 | static int swap_write_page(struct swap_map_handle *handle, void *buf, |
343df3c7 | 441 | struct hib_bio_batch *hb) |
ab954160 AM |
442 | { |
443 | int error = 0; | |
3aef83e0 | 444 | sector_t offset; |
61159a31 RW |
445 | |
446 | if (!handle->cur) | |
447 | return -EINVAL; | |
d1d241cc | 448 | offset = alloc_swapdev_block(root_swap); |
343df3c7 | 449 | error = write_page(buf, offset, hb); |
61159a31 RW |
450 | if (error) |
451 | return error; | |
452 | handle->cur->entries[handle->k++] = offset; | |
453 | if (handle->k >= MAP_PAGE_ENTRIES) { | |
d1d241cc | 454 | offset = alloc_swapdev_block(root_swap); |
61159a31 RW |
455 | if (!offset) |
456 | return -ENOSPC; | |
457 | handle->cur->next_swap = offset; | |
343df3c7 | 458 | error = write_page(handle->cur, handle->cur_swap, hb); |
61159a31 | 459 | if (error) |
ab954160 | 460 | goto out; |
3ecb01df | 461 | clear_page(handle->cur); |
61159a31 RW |
462 | handle->cur_swap = offset; |
463 | handle->k = 0; | |
5a21d489 | 464 | |
343df3c7 CH |
465 | if (hb && low_free_pages() <= handle->reqd_free_pages) { |
466 | error = hib_wait_io(hb); | |
5a21d489 BS |
467 | if (error) |
468 | goto out; | |
469 | /* | |
470 | * Recalculate the number of required free pages, to | |
471 | * make sure we never take more than half. | |
472 | */ | |
473 | handle->reqd_free_pages = reqd_free_pages(); | |
474 | } | |
081a9d04 | 475 | } |
59a49335 | 476 | out: |
ab954160 | 477 | return error; |
61159a31 RW |
478 | } |
479 | ||
480 | static int flush_swap_writer(struct swap_map_handle *handle) | |
481 | { | |
482 | if (handle->cur && handle->cur_swap) | |
ab954160 | 483 | return write_page(handle->cur, handle->cur_swap, NULL); |
61159a31 RW |
484 | else |
485 | return -EINVAL; | |
486 | } | |
487 | ||
6f612af5 JS |
488 | static int swap_writer_finish(struct swap_map_handle *handle, |
489 | unsigned int flags, int error) | |
490 | { | |
491 | if (!error) { | |
492 | flush_swap_writer(handle); | |
64ec72a1 | 493 | pr_info("S"); |
6f612af5 | 494 | error = mark_swapfiles(handle, flags); |
64ec72a1 | 495 | pr_cont("|\n"); |
6f612af5 JS |
496 | } |
497 | ||
498 | if (error) | |
499 | free_all_swap_pages(root_swap); | |
500 | release_swap_writer(handle); | |
501 | swsusp_close(FMODE_WRITE); | |
502 | ||
503 | return error; | |
504 | } | |
505 | ||
f996fc96 BS |
506 | /* We need to remember how much compressed data we need to read. */ |
507 | #define LZO_HEADER sizeof(size_t) | |
508 | ||
509 | /* Number of pages/bytes we'll compress at one time. */ | |
510 | #define LZO_UNC_PAGES 32 | |
511 | #define LZO_UNC_SIZE (LZO_UNC_PAGES * PAGE_SIZE) | |
512 | ||
513 | /* Number of pages/bytes we need for compressed data (worst case). */ | |
514 | #define LZO_CMP_PAGES DIV_ROUND_UP(lzo1x_worst_compress(LZO_UNC_SIZE) + \ | |
515 | LZO_HEADER, PAGE_SIZE) | |
516 | #define LZO_CMP_SIZE (LZO_CMP_PAGES * PAGE_SIZE) | |
517 | ||
081a9d04 BS |
518 | /* Maximum number of threads for compression/decompression. */ |
519 | #define LZO_THREADS 3 | |
520 | ||
5a21d489 BS |
521 | /* Minimum/maximum number of pages for read buffering. */ |
522 | #define LZO_MIN_RD_PAGES 1024 | |
523 | #define LZO_MAX_RD_PAGES 8192 | |
081a9d04 BS |
524 | |
525 | ||
61159a31 RW |
526 | /** |
527 | * save_image - save the suspend image data | |
528 | */ | |
529 | ||
530 | static int save_image(struct swap_map_handle *handle, | |
531 | struct snapshot_handle *snapshot, | |
3a4f7577 | 532 | unsigned int nr_to_write) |
61159a31 RW |
533 | { |
534 | unsigned int m; | |
535 | int ret; | |
3a4f7577 | 536 | int nr_pages; |
ab954160 | 537 | int err2; |
343df3c7 | 538 | struct hib_bio_batch hb; |
db597605 TR |
539 | ktime_t start; |
540 | ktime_t stop; | |
61159a31 | 541 | |
343df3c7 CH |
542 | hib_init_batch(&hb); |
543 | ||
64ec72a1 | 544 | pr_info("Saving image data pages (%u pages)...\n", |
23976728 | 545 | nr_to_write); |
d8150d35 | 546 | m = nr_to_write / 10; |
61159a31 RW |
547 | if (!m) |
548 | m = 1; | |
549 | nr_pages = 0; | |
db597605 | 550 | start = ktime_get(); |
4ff277f9 | 551 | while (1) { |
d3c1b24c | 552 | ret = snapshot_read_next(snapshot); |
4ff277f9 JS |
553 | if (ret <= 0) |
554 | break; | |
343df3c7 | 555 | ret = swap_write_page(handle, data_of(*snapshot), &hb); |
4ff277f9 JS |
556 | if (ret) |
557 | break; | |
558 | if (!(nr_pages % m)) | |
64ec72a1 JP |
559 | pr_info("Image saving progress: %3d%%\n", |
560 | nr_pages / m * 10); | |
4ff277f9 JS |
561 | nr_pages++; |
562 | } | |
343df3c7 | 563 | err2 = hib_wait_io(&hb); |
db597605 | 564 | stop = ktime_get(); |
4ff277f9 JS |
565 | if (!ret) |
566 | ret = err2; | |
567 | if (!ret) | |
64ec72a1 | 568 | pr_info("Image saving done\n"); |
db597605 | 569 | swsusp_show_speed(start, stop, nr_to_write, "Wrote"); |
4ff277f9 | 570 | return ret; |
61159a31 RW |
571 | } |
572 | ||
081a9d04 BS |
573 | /** |
574 | * Structure used for CRC32. | |
575 | */ | |
576 | struct crc_data { | |
577 | struct task_struct *thr; /* thread */ | |
578 | atomic_t ready; /* ready to start flag */ | |
579 | atomic_t stop; /* ready to stop flag */ | |
580 | unsigned run_threads; /* nr current threads */ | |
581 | wait_queue_head_t go; /* start crc update */ | |
582 | wait_queue_head_t done; /* crc update done */ | |
583 | u32 *crc32; /* points to handle's crc32 */ | |
584 | size_t *unc_len[LZO_THREADS]; /* uncompressed lengths */ | |
585 | unsigned char *unc[LZO_THREADS]; /* uncompressed data */ | |
586 | }; | |
587 | ||
588 | /** | |
589 | * CRC32 update function that runs in its own thread. | |
590 | */ | |
591 | static int crc32_threadfn(void *data) | |
592 | { | |
593 | struct crc_data *d = data; | |
594 | unsigned i; | |
595 | ||
596 | while (1) { | |
597 | wait_event(d->go, atomic_read(&d->ready) || | |
598 | kthread_should_stop()); | |
599 | if (kthread_should_stop()) { | |
600 | d->thr = NULL; | |
601 | atomic_set(&d->stop, 1); | |
602 | wake_up(&d->done); | |
603 | break; | |
604 | } | |
605 | atomic_set(&d->ready, 0); | |
606 | ||
607 | for (i = 0; i < d->run_threads; i++) | |
608 | *d->crc32 = crc32_le(*d->crc32, | |
609 | d->unc[i], *d->unc_len[i]); | |
610 | atomic_set(&d->stop, 1); | |
611 | wake_up(&d->done); | |
612 | } | |
613 | return 0; | |
614 | } | |
615 | /** | |
616 | * Structure used for LZO data compression. | |
617 | */ | |
618 | struct cmp_data { | |
619 | struct task_struct *thr; /* thread */ | |
620 | atomic_t ready; /* ready to start flag */ | |
621 | atomic_t stop; /* ready to stop flag */ | |
622 | int ret; /* return code */ | |
623 | wait_queue_head_t go; /* start compression */ | |
624 | wait_queue_head_t done; /* compression done */ | |
625 | size_t unc_len; /* uncompressed length */ | |
626 | size_t cmp_len; /* compressed length */ | |
627 | unsigned char unc[LZO_UNC_SIZE]; /* uncompressed buffer */ | |
628 | unsigned char cmp[LZO_CMP_SIZE]; /* compressed buffer */ | |
629 | unsigned char wrk[LZO1X_1_MEM_COMPRESS]; /* compression workspace */ | |
630 | }; | |
631 | ||
632 | /** | |
633 | * Compression function that runs in its own thread. | |
634 | */ | |
635 | static int lzo_compress_threadfn(void *data) | |
636 | { | |
637 | struct cmp_data *d = data; | |
638 | ||
639 | while (1) { | |
640 | wait_event(d->go, atomic_read(&d->ready) || | |
641 | kthread_should_stop()); | |
642 | if (kthread_should_stop()) { | |
643 | d->thr = NULL; | |
644 | d->ret = -1; | |
645 | atomic_set(&d->stop, 1); | |
646 | wake_up(&d->done); | |
647 | break; | |
648 | } | |
649 | atomic_set(&d->ready, 0); | |
650 | ||
651 | d->ret = lzo1x_1_compress(d->unc, d->unc_len, | |
652 | d->cmp + LZO_HEADER, &d->cmp_len, | |
653 | d->wrk); | |
654 | atomic_set(&d->stop, 1); | |
655 | wake_up(&d->done); | |
656 | } | |
657 | return 0; | |
658 | } | |
f996fc96 BS |
659 | |
660 | /** | |
661 | * save_image_lzo - Save the suspend image data compressed with LZO. | |
057b0a75 | 662 | * @handle: Swap map handle to use for saving the image. |
f996fc96 BS |
663 | * @snapshot: Image to read data from. |
664 | * @nr_to_write: Number of pages to save. | |
665 | */ | |
666 | static int save_image_lzo(struct swap_map_handle *handle, | |
667 | struct snapshot_handle *snapshot, | |
668 | unsigned int nr_to_write) | |
669 | { | |
670 | unsigned int m; | |
671 | int ret = 0; | |
672 | int nr_pages; | |
673 | int err2; | |
343df3c7 | 674 | struct hib_bio_batch hb; |
db597605 TR |
675 | ktime_t start; |
676 | ktime_t stop; | |
081a9d04 BS |
677 | size_t off; |
678 | unsigned thr, run_threads, nr_threads; | |
679 | unsigned char *page = NULL; | |
680 | struct cmp_data *data = NULL; | |
681 | struct crc_data *crc = NULL; | |
682 | ||
343df3c7 CH |
683 | hib_init_batch(&hb); |
684 | ||
081a9d04 BS |
685 | /* |
686 | * We'll limit the number of threads for compression to limit memory | |
687 | * footprint. | |
688 | */ | |
689 | nr_threads = num_online_cpus() - 1; | |
690 | nr_threads = clamp_val(nr_threads, 1, LZO_THREADS); | |
f996fc96 | 691 | |
0eb0b63c | 692 | page = (void *)__get_free_page(GFP_NOIO | __GFP_HIGH); |
f996fc96 | 693 | if (!page) { |
64ec72a1 | 694 | pr_err("Failed to allocate LZO page\n"); |
081a9d04 BS |
695 | ret = -ENOMEM; |
696 | goto out_clean; | |
f996fc96 BS |
697 | } |
698 | ||
42bc47b3 | 699 | data = vmalloc(array_size(nr_threads, sizeof(*data))); |
081a9d04 | 700 | if (!data) { |
64ec72a1 | 701 | pr_err("Failed to allocate LZO data\n"); |
081a9d04 BS |
702 | ret = -ENOMEM; |
703 | goto out_clean; | |
f996fc96 | 704 | } |
081a9d04 BS |
705 | for (thr = 0; thr < nr_threads; thr++) |
706 | memset(&data[thr], 0, offsetof(struct cmp_data, go)); | |
f996fc96 | 707 | |
081a9d04 BS |
708 | crc = kmalloc(sizeof(*crc), GFP_KERNEL); |
709 | if (!crc) { | |
64ec72a1 | 710 | pr_err("Failed to allocate crc\n"); |
081a9d04 BS |
711 | ret = -ENOMEM; |
712 | goto out_clean; | |
713 | } | |
714 | memset(crc, 0, offsetof(struct crc_data, go)); | |
715 | ||
716 | /* | |
717 | * Start the compression threads. | |
718 | */ | |
719 | for (thr = 0; thr < nr_threads; thr++) { | |
720 | init_waitqueue_head(&data[thr].go); | |
721 | init_waitqueue_head(&data[thr].done); | |
722 | ||
723 | data[thr].thr = kthread_run(lzo_compress_threadfn, | |
724 | &data[thr], | |
725 | "image_compress/%u", thr); | |
726 | if (IS_ERR(data[thr].thr)) { | |
727 | data[thr].thr = NULL; | |
64ec72a1 | 728 | pr_err("Cannot start compression threads\n"); |
081a9d04 BS |
729 | ret = -ENOMEM; |
730 | goto out_clean; | |
731 | } | |
f996fc96 BS |
732 | } |
733 | ||
081a9d04 BS |
734 | /* |
735 | * Start the CRC32 thread. | |
736 | */ | |
737 | init_waitqueue_head(&crc->go); | |
738 | init_waitqueue_head(&crc->done); | |
739 | ||
740 | handle->crc32 = 0; | |
741 | crc->crc32 = &handle->crc32; | |
742 | for (thr = 0; thr < nr_threads; thr++) { | |
743 | crc->unc[thr] = data[thr].unc; | |
744 | crc->unc_len[thr] = &data[thr].unc_len; | |
745 | } | |
746 | ||
747 | crc->thr = kthread_run(crc32_threadfn, crc, "image_crc32"); | |
748 | if (IS_ERR(crc->thr)) { | |
749 | crc->thr = NULL; | |
64ec72a1 | 750 | pr_err("Cannot start CRC32 thread\n"); |
081a9d04 BS |
751 | ret = -ENOMEM; |
752 | goto out_clean; | |
f996fc96 BS |
753 | } |
754 | ||
5a21d489 BS |
755 | /* |
756 | * Adjust the number of required free pages after all allocations have | |
757 | * been done. We don't want to run out of pages when writing. | |
758 | */ | |
759 | handle->reqd_free_pages = reqd_free_pages(); | |
760 | ||
64ec72a1 JP |
761 | pr_info("Using %u thread(s) for compression\n", nr_threads); |
762 | pr_info("Compressing and saving image data (%u pages)...\n", | |
763 | nr_to_write); | |
d8150d35 | 764 | m = nr_to_write / 10; |
f996fc96 BS |
765 | if (!m) |
766 | m = 1; | |
767 | nr_pages = 0; | |
db597605 | 768 | start = ktime_get(); |
f996fc96 | 769 | for (;;) { |
081a9d04 BS |
770 | for (thr = 0; thr < nr_threads; thr++) { |
771 | for (off = 0; off < LZO_UNC_SIZE; off += PAGE_SIZE) { | |
772 | ret = snapshot_read_next(snapshot); | |
773 | if (ret < 0) | |
774 | goto out_finish; | |
775 | ||
776 | if (!ret) | |
777 | break; | |
778 | ||
779 | memcpy(data[thr].unc + off, | |
780 | data_of(*snapshot), PAGE_SIZE); | |
781 | ||
782 | if (!(nr_pages % m)) | |
64ec72a1 JP |
783 | pr_info("Image saving progress: %3d%%\n", |
784 | nr_pages / m * 10); | |
081a9d04 BS |
785 | nr_pages++; |
786 | } | |
787 | if (!off) | |
f996fc96 BS |
788 | break; |
789 | ||
081a9d04 | 790 | data[thr].unc_len = off; |
f996fc96 | 791 | |
081a9d04 BS |
792 | atomic_set(&data[thr].ready, 1); |
793 | wake_up(&data[thr].go); | |
f996fc96 BS |
794 | } |
795 | ||
081a9d04 | 796 | if (!thr) |
f996fc96 BS |
797 | break; |
798 | ||
081a9d04 BS |
799 | crc->run_threads = thr; |
800 | atomic_set(&crc->ready, 1); | |
801 | wake_up(&crc->go); | |
f996fc96 | 802 | |
081a9d04 BS |
803 | for (run_threads = thr, thr = 0; thr < run_threads; thr++) { |
804 | wait_event(data[thr].done, | |
805 | atomic_read(&data[thr].stop)); | |
806 | atomic_set(&data[thr].stop, 0); | |
f996fc96 | 807 | |
081a9d04 | 808 | ret = data[thr].ret; |
f996fc96 | 809 | |
081a9d04 | 810 | if (ret < 0) { |
64ec72a1 | 811 | pr_err("LZO compression failed\n"); |
081a9d04 BS |
812 | goto out_finish; |
813 | } | |
f996fc96 | 814 | |
081a9d04 BS |
815 | if (unlikely(!data[thr].cmp_len || |
816 | data[thr].cmp_len > | |
817 | lzo1x_worst_compress(data[thr].unc_len))) { | |
64ec72a1 | 818 | pr_err("Invalid LZO compressed length\n"); |
081a9d04 | 819 | ret = -1; |
f996fc96 | 820 | goto out_finish; |
081a9d04 BS |
821 | } |
822 | ||
823 | *(size_t *)data[thr].cmp = data[thr].cmp_len; | |
824 | ||
825 | /* | |
826 | * Given we are writing one page at a time to disk, we | |
827 | * copy that much from the buffer, although the last | |
828 | * bit will likely be smaller than full page. This is | |
829 | * OK - we saved the length of the compressed data, so | |
830 | * any garbage at the end will be discarded when we | |
831 | * read it. | |
832 | */ | |
833 | for (off = 0; | |
834 | off < LZO_HEADER + data[thr].cmp_len; | |
835 | off += PAGE_SIZE) { | |
836 | memcpy(page, data[thr].cmp + off, PAGE_SIZE); | |
837 | ||
343df3c7 | 838 | ret = swap_write_page(handle, page, &hb); |
081a9d04 BS |
839 | if (ret) |
840 | goto out_finish; | |
841 | } | |
f996fc96 | 842 | } |
081a9d04 BS |
843 | |
844 | wait_event(crc->done, atomic_read(&crc->stop)); | |
845 | atomic_set(&crc->stop, 0); | |
f996fc96 BS |
846 | } |
847 | ||
848 | out_finish: | |
343df3c7 | 849 | err2 = hib_wait_io(&hb); |
db597605 | 850 | stop = ktime_get(); |
f996fc96 BS |
851 | if (!ret) |
852 | ret = err2; | |
d8150d35 | 853 | if (!ret) |
64ec72a1 | 854 | pr_info("Image saving done\n"); |
db597605 | 855 | swsusp_show_speed(start, stop, nr_to_write, "Wrote"); |
081a9d04 BS |
856 | out_clean: |
857 | if (crc) { | |
858 | if (crc->thr) | |
859 | kthread_stop(crc->thr); | |
860 | kfree(crc); | |
861 | } | |
862 | if (data) { | |
863 | for (thr = 0; thr < nr_threads; thr++) | |
864 | if (data[thr].thr) | |
865 | kthread_stop(data[thr].thr); | |
866 | vfree(data); | |
867 | } | |
868 | if (page) free_page((unsigned long)page); | |
f996fc96 BS |
869 | |
870 | return ret; | |
871 | } | |
872 | ||
61159a31 RW |
873 | /** |
874 | * enough_swap - Make sure we have enough swap to save the image. | |
875 | * | |
876 | * Returns TRUE or FALSE after checking the total amount of swap | |
877 | * space avaiable from the resume partition. | |
878 | */ | |
879 | ||
8ffdfe35 | 880 | static int enough_swap(unsigned int nr_pages) |
61159a31 RW |
881 | { |
882 | unsigned int free_swap = count_swap_pages(root_swap, 1); | |
f996fc96 | 883 | unsigned int required; |
61159a31 | 884 | |
64ec72a1 | 885 | pr_debug("Free swap pages: %u\n", free_swap); |
f996fc96 | 886 | |
ee34a370 | 887 | required = PAGES_FOR_IO + nr_pages; |
f996fc96 | 888 | return free_swap > required; |
61159a31 RW |
889 | } |
890 | ||
891 | /** | |
892 | * swsusp_write - Write entire image and metadata. | |
a634cc10 | 893 | * @flags: flags to pass to the "boot" kernel in the image header |
61159a31 RW |
894 | * |
895 | * It is important _NOT_ to umount filesystems at this point. We want | |
896 | * them synced (in case something goes wrong) but we DO not want to mark | |
897 | * filesystem clean: it is not. (And it does not matter, if we resume | |
898 | * correctly, we'll mark system clean, anyway.) | |
899 | */ | |
900 | ||
a634cc10 | 901 | int swsusp_write(unsigned int flags) |
61159a31 RW |
902 | { |
903 | struct swap_map_handle handle; | |
904 | struct snapshot_handle snapshot; | |
905 | struct swsusp_info *header; | |
6f612af5 | 906 | unsigned long pages; |
61159a31 RW |
907 | int error; |
908 | ||
6f612af5 JS |
909 | pages = snapshot_get_image_size(); |
910 | error = get_swap_writer(&handle); | |
3aef83e0 | 911 | if (error) { |
64ec72a1 | 912 | pr_err("Cannot get swap writer\n"); |
61159a31 RW |
913 | return error; |
914 | } | |
ee34a370 | 915 | if (flags & SF_NOCOMPRESS_MODE) { |
8ffdfe35 | 916 | if (!enough_swap(pages)) { |
64ec72a1 | 917 | pr_err("Not enough free swap\n"); |
ee34a370 BS |
918 | error = -ENOSPC; |
919 | goto out_finish; | |
920 | } | |
6f612af5 | 921 | } |
61159a31 | 922 | memset(&snapshot, 0, sizeof(struct snapshot_handle)); |
d3c1b24c | 923 | error = snapshot_read_next(&snapshot); |
d5641c64 | 924 | if (error < (int)PAGE_SIZE) { |
3aef83e0 RW |
925 | if (error >= 0) |
926 | error = -EFAULT; | |
927 | ||
6f612af5 | 928 | goto out_finish; |
3aef83e0 | 929 | } |
61159a31 | 930 | header = (struct swsusp_info *)data_of(snapshot); |
6f612af5 | 931 | error = swap_write_page(&handle, header, NULL); |
f996fc96 BS |
932 | if (!error) { |
933 | error = (flags & SF_NOCOMPRESS_MODE) ? | |
934 | save_image(&handle, &snapshot, pages - 1) : | |
935 | save_image_lzo(&handle, &snapshot, pages - 1); | |
936 | } | |
6f612af5 JS |
937 | out_finish: |
938 | error = swap_writer_finish(&handle, flags, error); | |
61159a31 RW |
939 | return error; |
940 | } | |
941 | ||
61159a31 RW |
942 | /** |
943 | * The following functions allow us to read data using a swap map | |
944 | * in a file-alike way | |
945 | */ | |
946 | ||
947 | static void release_swap_reader(struct swap_map_handle *handle) | |
948 | { | |
081a9d04 BS |
949 | struct swap_map_page_list *tmp; |
950 | ||
951 | while (handle->maps) { | |
952 | if (handle->maps->map) | |
953 | free_page((unsigned long)handle->maps->map); | |
954 | tmp = handle->maps; | |
955 | handle->maps = handle->maps->next; | |
956 | kfree(tmp); | |
957 | } | |
61159a31 RW |
958 | handle->cur = NULL; |
959 | } | |
960 | ||
6f612af5 JS |
961 | static int get_swap_reader(struct swap_map_handle *handle, |
962 | unsigned int *flags_p) | |
61159a31 RW |
963 | { |
964 | int error; | |
081a9d04 BS |
965 | struct swap_map_page_list *tmp, *last; |
966 | sector_t offset; | |
61159a31 | 967 | |
6f612af5 JS |
968 | *flags_p = swsusp_header->flags; |
969 | ||
970 | if (!swsusp_header->image) /* how can this happen? */ | |
61159a31 | 971 | return -EINVAL; |
3aef83e0 | 972 | |
081a9d04 BS |
973 | handle->cur = NULL; |
974 | last = handle->maps = NULL; | |
975 | offset = swsusp_header->image; | |
976 | while (offset) { | |
2f02a7ec | 977 | tmp = kzalloc(sizeof(*handle->maps), GFP_KERNEL); |
081a9d04 BS |
978 | if (!tmp) { |
979 | release_swap_reader(handle); | |
980 | return -ENOMEM; | |
981 | } | |
081a9d04 BS |
982 | if (!handle->maps) |
983 | handle->maps = tmp; | |
984 | if (last) | |
985 | last->next = tmp; | |
986 | last = tmp; | |
987 | ||
988 | tmp->map = (struct swap_map_page *) | |
0eb0b63c | 989 | __get_free_page(GFP_NOIO | __GFP_HIGH); |
081a9d04 BS |
990 | if (!tmp->map) { |
991 | release_swap_reader(handle); | |
992 | return -ENOMEM; | |
993 | } | |
3aef83e0 | 994 | |
70fd7614 | 995 | error = hib_submit_io(REQ_OP_READ, 0, offset, tmp->map, NULL); |
081a9d04 BS |
996 | if (error) { |
997 | release_swap_reader(handle); | |
998 | return error; | |
999 | } | |
1000 | offset = tmp->map->next_swap; | |
61159a31 RW |
1001 | } |
1002 | handle->k = 0; | |
081a9d04 | 1003 | handle->cur = handle->maps->map; |
61159a31 RW |
1004 | return 0; |
1005 | } | |
1006 | ||
546e0d27 | 1007 | static int swap_read_page(struct swap_map_handle *handle, void *buf, |
343df3c7 | 1008 | struct hib_bio_batch *hb) |
61159a31 | 1009 | { |
3aef83e0 | 1010 | sector_t offset; |
61159a31 | 1011 | int error; |
081a9d04 | 1012 | struct swap_map_page_list *tmp; |
61159a31 RW |
1013 | |
1014 | if (!handle->cur) | |
1015 | return -EINVAL; | |
1016 | offset = handle->cur->entries[handle->k]; | |
1017 | if (!offset) | |
1018 | return -EFAULT; | |
70fd7614 | 1019 | error = hib_submit_io(REQ_OP_READ, 0, offset, buf, hb); |
61159a31 RW |
1020 | if (error) |
1021 | return error; | |
1022 | if (++handle->k >= MAP_PAGE_ENTRIES) { | |
1023 | handle->k = 0; | |
081a9d04 BS |
1024 | free_page((unsigned long)handle->maps->map); |
1025 | tmp = handle->maps; | |
1026 | handle->maps = handle->maps->next; | |
1027 | kfree(tmp); | |
1028 | if (!handle->maps) | |
61159a31 | 1029 | release_swap_reader(handle); |
081a9d04 BS |
1030 | else |
1031 | handle->cur = handle->maps->map; | |
61159a31 RW |
1032 | } |
1033 | return error; | |
1034 | } | |
1035 | ||
6f612af5 JS |
1036 | static int swap_reader_finish(struct swap_map_handle *handle) |
1037 | { | |
1038 | release_swap_reader(handle); | |
1039 | ||
1040 | return 0; | |
1041 | } | |
1042 | ||
61159a31 RW |
1043 | /** |
1044 | * load_image - load the image using the swap map handle | |
1045 | * @handle and the snapshot handle @snapshot | |
1046 | * (assume there are @nr_pages pages to load) | |
1047 | */ | |
1048 | ||
1049 | static int load_image(struct swap_map_handle *handle, | |
1050 | struct snapshot_handle *snapshot, | |
546e0d27 | 1051 | unsigned int nr_to_read) |
61159a31 RW |
1052 | { |
1053 | unsigned int m; | |
081a9d04 | 1054 | int ret = 0; |
db597605 TR |
1055 | ktime_t start; |
1056 | ktime_t stop; | |
343df3c7 | 1057 | struct hib_bio_batch hb; |
546e0d27 AM |
1058 | int err2; |
1059 | unsigned nr_pages; | |
61159a31 | 1060 | |
343df3c7 CH |
1061 | hib_init_batch(&hb); |
1062 | ||
f6cf0545 | 1063 | clean_pages_on_read = true; |
64ec72a1 | 1064 | pr_info("Loading image data pages (%u pages)...\n", nr_to_read); |
d8150d35 | 1065 | m = nr_to_read / 10; |
61159a31 RW |
1066 | if (!m) |
1067 | m = 1; | |
1068 | nr_pages = 0; | |
db597605 | 1069 | start = ktime_get(); |
546e0d27 | 1070 | for ( ; ; ) { |
081a9d04 BS |
1071 | ret = snapshot_write_next(snapshot); |
1072 | if (ret <= 0) | |
546e0d27 | 1073 | break; |
343df3c7 | 1074 | ret = swap_read_page(handle, data_of(*snapshot), &hb); |
081a9d04 | 1075 | if (ret) |
546e0d27 AM |
1076 | break; |
1077 | if (snapshot->sync_read) | |
343df3c7 | 1078 | ret = hib_wait_io(&hb); |
081a9d04 | 1079 | if (ret) |
546e0d27 AM |
1080 | break; |
1081 | if (!(nr_pages % m)) | |
64ec72a1 JP |
1082 | pr_info("Image loading progress: %3d%%\n", |
1083 | nr_pages / m * 10); | |
546e0d27 AM |
1084 | nr_pages++; |
1085 | } | |
343df3c7 | 1086 | err2 = hib_wait_io(&hb); |
db597605 | 1087 | stop = ktime_get(); |
081a9d04 BS |
1088 | if (!ret) |
1089 | ret = err2; | |
1090 | if (!ret) { | |
64ec72a1 | 1091 | pr_info("Image loading done\n"); |
8357376d | 1092 | snapshot_write_finalize(snapshot); |
e655a250 | 1093 | if (!snapshot_image_loaded(snapshot)) |
081a9d04 | 1094 | ret = -ENODATA; |
d8150d35 | 1095 | } |
db597605 | 1096 | swsusp_show_speed(start, stop, nr_to_read, "Read"); |
081a9d04 BS |
1097 | return ret; |
1098 | } | |
1099 | ||
1100 | /** | |
1101 | * Structure used for LZO data decompression. | |
1102 | */ | |
1103 | struct dec_data { | |
1104 | struct task_struct *thr; /* thread */ | |
1105 | atomic_t ready; /* ready to start flag */ | |
1106 | atomic_t stop; /* ready to stop flag */ | |
1107 | int ret; /* return code */ | |
1108 | wait_queue_head_t go; /* start decompression */ | |
1109 | wait_queue_head_t done; /* decompression done */ | |
1110 | size_t unc_len; /* uncompressed length */ | |
1111 | size_t cmp_len; /* compressed length */ | |
1112 | unsigned char unc[LZO_UNC_SIZE]; /* uncompressed buffer */ | |
1113 | unsigned char cmp[LZO_CMP_SIZE]; /* compressed buffer */ | |
1114 | }; | |
1115 | ||
1116 | /** | |
1117 | * Deompression function that runs in its own thread. | |
1118 | */ | |
1119 | static int lzo_decompress_threadfn(void *data) | |
1120 | { | |
1121 | struct dec_data *d = data; | |
1122 | ||
1123 | while (1) { | |
1124 | wait_event(d->go, atomic_read(&d->ready) || | |
1125 | kthread_should_stop()); | |
1126 | if (kthread_should_stop()) { | |
1127 | d->thr = NULL; | |
1128 | d->ret = -1; | |
1129 | atomic_set(&d->stop, 1); | |
1130 | wake_up(&d->done); | |
1131 | break; | |
1132 | } | |
1133 | atomic_set(&d->ready, 0); | |
1134 | ||
1135 | d->unc_len = LZO_UNC_SIZE; | |
1136 | d->ret = lzo1x_decompress_safe(d->cmp + LZO_HEADER, d->cmp_len, | |
1137 | d->unc, &d->unc_len); | |
f6cf0545 JM |
1138 | if (clean_pages_on_decompress) |
1139 | flush_icache_range((unsigned long)d->unc, | |
1140 | (unsigned long)d->unc + d->unc_len); | |
1141 | ||
081a9d04 BS |
1142 | atomic_set(&d->stop, 1); |
1143 | wake_up(&d->done); | |
1144 | } | |
1145 | return 0; | |
61159a31 RW |
1146 | } |
1147 | ||
f996fc96 BS |
1148 | /** |
1149 | * load_image_lzo - Load compressed image data and decompress them with LZO. | |
1150 | * @handle: Swap map handle to use for loading data. | |
1151 | * @snapshot: Image to copy uncompressed data into. | |
1152 | * @nr_to_read: Number of pages to load. | |
1153 | */ | |
1154 | static int load_image_lzo(struct swap_map_handle *handle, | |
1155 | struct snapshot_handle *snapshot, | |
1156 | unsigned int nr_to_read) | |
1157 | { | |
1158 | unsigned int m; | |
081a9d04 BS |
1159 | int ret = 0; |
1160 | int eof = 0; | |
343df3c7 | 1161 | struct hib_bio_batch hb; |
db597605 TR |
1162 | ktime_t start; |
1163 | ktime_t stop; | |
f996fc96 | 1164 | unsigned nr_pages; |
081a9d04 BS |
1165 | size_t off; |
1166 | unsigned i, thr, run_threads, nr_threads; | |
1167 | unsigned ring = 0, pg = 0, ring_size = 0, | |
1168 | have = 0, want, need, asked = 0; | |
5a21d489 | 1169 | unsigned long read_pages = 0; |
081a9d04 BS |
1170 | unsigned char **page = NULL; |
1171 | struct dec_data *data = NULL; | |
1172 | struct crc_data *crc = NULL; | |
1173 | ||
343df3c7 CH |
1174 | hib_init_batch(&hb); |
1175 | ||
081a9d04 BS |
1176 | /* |
1177 | * We'll limit the number of threads for decompression to limit memory | |
1178 | * footprint. | |
1179 | */ | |
1180 | nr_threads = num_online_cpus() - 1; | |
1181 | nr_threads = clamp_val(nr_threads, 1, LZO_THREADS); | |
1182 | ||
42bc47b3 | 1183 | page = vmalloc(array_size(LZO_MAX_RD_PAGES, sizeof(*page))); |
081a9d04 | 1184 | if (!page) { |
64ec72a1 | 1185 | pr_err("Failed to allocate LZO page\n"); |
081a9d04 BS |
1186 | ret = -ENOMEM; |
1187 | goto out_clean; | |
1188 | } | |
9f339caf | 1189 | |
42bc47b3 | 1190 | data = vmalloc(array_size(nr_threads, sizeof(*data))); |
081a9d04 | 1191 | if (!data) { |
64ec72a1 | 1192 | pr_err("Failed to allocate LZO data\n"); |
081a9d04 BS |
1193 | ret = -ENOMEM; |
1194 | goto out_clean; | |
1195 | } | |
1196 | for (thr = 0; thr < nr_threads; thr++) | |
1197 | memset(&data[thr], 0, offsetof(struct dec_data, go)); | |
9f339caf | 1198 | |
081a9d04 BS |
1199 | crc = kmalloc(sizeof(*crc), GFP_KERNEL); |
1200 | if (!crc) { | |
64ec72a1 | 1201 | pr_err("Failed to allocate crc\n"); |
081a9d04 BS |
1202 | ret = -ENOMEM; |
1203 | goto out_clean; | |
1204 | } | |
1205 | memset(crc, 0, offsetof(struct crc_data, go)); | |
1206 | ||
f6cf0545 JM |
1207 | clean_pages_on_decompress = true; |
1208 | ||
081a9d04 BS |
1209 | /* |
1210 | * Start the decompression threads. | |
1211 | */ | |
1212 | for (thr = 0; thr < nr_threads; thr++) { | |
1213 | init_waitqueue_head(&data[thr].go); | |
1214 | init_waitqueue_head(&data[thr].done); | |
1215 | ||
1216 | data[thr].thr = kthread_run(lzo_decompress_threadfn, | |
1217 | &data[thr], | |
1218 | "image_decompress/%u", thr); | |
1219 | if (IS_ERR(data[thr].thr)) { | |
1220 | data[thr].thr = NULL; | |
64ec72a1 | 1221 | pr_err("Cannot start decompression threads\n"); |
081a9d04 BS |
1222 | ret = -ENOMEM; |
1223 | goto out_clean; | |
9f339caf | 1224 | } |
f996fc96 BS |
1225 | } |
1226 | ||
081a9d04 BS |
1227 | /* |
1228 | * Start the CRC32 thread. | |
1229 | */ | |
1230 | init_waitqueue_head(&crc->go); | |
1231 | init_waitqueue_head(&crc->done); | |
1232 | ||
1233 | handle->crc32 = 0; | |
1234 | crc->crc32 = &handle->crc32; | |
1235 | for (thr = 0; thr < nr_threads; thr++) { | |
1236 | crc->unc[thr] = data[thr].unc; | |
1237 | crc->unc_len[thr] = &data[thr].unc_len; | |
f996fc96 BS |
1238 | } |
1239 | ||
081a9d04 BS |
1240 | crc->thr = kthread_run(crc32_threadfn, crc, "image_crc32"); |
1241 | if (IS_ERR(crc->thr)) { | |
1242 | crc->thr = NULL; | |
64ec72a1 | 1243 | pr_err("Cannot start CRC32 thread\n"); |
081a9d04 BS |
1244 | ret = -ENOMEM; |
1245 | goto out_clean; | |
1246 | } | |
9f339caf | 1247 | |
081a9d04 | 1248 | /* |
5a21d489 BS |
1249 | * Set the number of pages for read buffering. |
1250 | * This is complete guesswork, because we'll only know the real | |
1251 | * picture once prepare_image() is called, which is much later on | |
1252 | * during the image load phase. We'll assume the worst case and | |
1253 | * say that none of the image pages are from high memory. | |
081a9d04 | 1254 | */ |
5a21d489 BS |
1255 | if (low_free_pages() > snapshot_get_image_size()) |
1256 | read_pages = (low_free_pages() - snapshot_get_image_size()) / 2; | |
1257 | read_pages = clamp_val(read_pages, LZO_MIN_RD_PAGES, LZO_MAX_RD_PAGES); | |
9f339caf | 1258 | |
081a9d04 BS |
1259 | for (i = 0; i < read_pages; i++) { |
1260 | page[i] = (void *)__get_free_page(i < LZO_CMP_PAGES ? | |
0eb0b63c CH |
1261 | GFP_NOIO | __GFP_HIGH : |
1262 | GFP_NOIO | __GFP_NOWARN | | |
71baba4b | 1263 | __GFP_NORETRY); |
5a21d489 | 1264 | |
081a9d04 BS |
1265 | if (!page[i]) { |
1266 | if (i < LZO_CMP_PAGES) { | |
1267 | ring_size = i; | |
64ec72a1 | 1268 | pr_err("Failed to allocate LZO pages\n"); |
081a9d04 BS |
1269 | ret = -ENOMEM; |
1270 | goto out_clean; | |
1271 | } else { | |
1272 | break; | |
1273 | } | |
1274 | } | |
f996fc96 | 1275 | } |
081a9d04 | 1276 | want = ring_size = i; |
f996fc96 | 1277 | |
64ec72a1 JP |
1278 | pr_info("Using %u thread(s) for decompression\n", nr_threads); |
1279 | pr_info("Loading and decompressing image data (%u pages)...\n", | |
1280 | nr_to_read); | |
d8150d35 | 1281 | m = nr_to_read / 10; |
f996fc96 BS |
1282 | if (!m) |
1283 | m = 1; | |
1284 | nr_pages = 0; | |
db597605 | 1285 | start = ktime_get(); |
f996fc96 | 1286 | |
081a9d04 BS |
1287 | ret = snapshot_write_next(snapshot); |
1288 | if (ret <= 0) | |
f996fc96 BS |
1289 | goto out_finish; |
1290 | ||
081a9d04 BS |
1291 | for(;;) { |
1292 | for (i = 0; !eof && i < want; i++) { | |
343df3c7 | 1293 | ret = swap_read_page(handle, page[ring], &hb); |
081a9d04 BS |
1294 | if (ret) { |
1295 | /* | |
1296 | * On real read error, finish. On end of data, | |
1297 | * set EOF flag and just exit the read loop. | |
1298 | */ | |
1299 | if (handle->cur && | |
1300 | handle->cur->entries[handle->k]) { | |
1301 | goto out_finish; | |
1302 | } else { | |
1303 | eof = 1; | |
1304 | break; | |
1305 | } | |
1306 | } | |
1307 | if (++ring >= ring_size) | |
1308 | ring = 0; | |
f996fc96 | 1309 | } |
081a9d04 BS |
1310 | asked += i; |
1311 | want -= i; | |
f996fc96 | 1312 | |
081a9d04 BS |
1313 | /* |
1314 | * We are out of data, wait for some more. | |
1315 | */ | |
1316 | if (!have) { | |
1317 | if (!asked) | |
1318 | break; | |
1319 | ||
343df3c7 | 1320 | ret = hib_wait_io(&hb); |
081a9d04 | 1321 | if (ret) |
f996fc96 | 1322 | goto out_finish; |
081a9d04 BS |
1323 | have += asked; |
1324 | asked = 0; | |
1325 | if (eof) | |
1326 | eof = 2; | |
9f339caf | 1327 | } |
f996fc96 | 1328 | |
081a9d04 BS |
1329 | if (crc->run_threads) { |
1330 | wait_event(crc->done, atomic_read(&crc->stop)); | |
1331 | atomic_set(&crc->stop, 0); | |
1332 | crc->run_threads = 0; | |
f996fc96 BS |
1333 | } |
1334 | ||
081a9d04 BS |
1335 | for (thr = 0; have && thr < nr_threads; thr++) { |
1336 | data[thr].cmp_len = *(size_t *)page[pg]; | |
1337 | if (unlikely(!data[thr].cmp_len || | |
1338 | data[thr].cmp_len > | |
1339 | lzo1x_worst_compress(LZO_UNC_SIZE))) { | |
64ec72a1 | 1340 | pr_err("Invalid LZO compressed length\n"); |
081a9d04 BS |
1341 | ret = -1; |
1342 | goto out_finish; | |
1343 | } | |
1344 | ||
1345 | need = DIV_ROUND_UP(data[thr].cmp_len + LZO_HEADER, | |
1346 | PAGE_SIZE); | |
1347 | if (need > have) { | |
1348 | if (eof > 1) { | |
1349 | ret = -1; | |
1350 | goto out_finish; | |
1351 | } | |
1352 | break; | |
1353 | } | |
1354 | ||
1355 | for (off = 0; | |
1356 | off < LZO_HEADER + data[thr].cmp_len; | |
1357 | off += PAGE_SIZE) { | |
1358 | memcpy(data[thr].cmp + off, | |
1359 | page[pg], PAGE_SIZE); | |
1360 | have--; | |
1361 | want++; | |
1362 | if (++pg >= ring_size) | |
1363 | pg = 0; | |
1364 | } | |
1365 | ||
1366 | atomic_set(&data[thr].ready, 1); | |
1367 | wake_up(&data[thr].go); | |
f996fc96 BS |
1368 | } |
1369 | ||
081a9d04 BS |
1370 | /* |
1371 | * Wait for more data while we are decompressing. | |
1372 | */ | |
1373 | if (have < LZO_CMP_PAGES && asked) { | |
343df3c7 | 1374 | ret = hib_wait_io(&hb); |
081a9d04 BS |
1375 | if (ret) |
1376 | goto out_finish; | |
1377 | have += asked; | |
1378 | asked = 0; | |
1379 | if (eof) | |
1380 | eof = 2; | |
f996fc96 BS |
1381 | } |
1382 | ||
081a9d04 BS |
1383 | for (run_threads = thr, thr = 0; thr < run_threads; thr++) { |
1384 | wait_event(data[thr].done, | |
1385 | atomic_read(&data[thr].stop)); | |
1386 | atomic_set(&data[thr].stop, 0); | |
1387 | ||
1388 | ret = data[thr].ret; | |
f996fc96 | 1389 | |
081a9d04 | 1390 | if (ret < 0) { |
64ec72a1 | 1391 | pr_err("LZO decompression failed\n"); |
081a9d04 BS |
1392 | goto out_finish; |
1393 | } | |
f996fc96 | 1394 | |
081a9d04 BS |
1395 | if (unlikely(!data[thr].unc_len || |
1396 | data[thr].unc_len > LZO_UNC_SIZE || | |
1397 | data[thr].unc_len & (PAGE_SIZE - 1))) { | |
64ec72a1 | 1398 | pr_err("Invalid LZO uncompressed length\n"); |
081a9d04 | 1399 | ret = -1; |
f996fc96 | 1400 | goto out_finish; |
081a9d04 BS |
1401 | } |
1402 | ||
1403 | for (off = 0; | |
1404 | off < data[thr].unc_len; off += PAGE_SIZE) { | |
1405 | memcpy(data_of(*snapshot), | |
1406 | data[thr].unc + off, PAGE_SIZE); | |
1407 | ||
1408 | if (!(nr_pages % m)) | |
64ec72a1 JP |
1409 | pr_info("Image loading progress: %3d%%\n", |
1410 | nr_pages / m * 10); | |
081a9d04 BS |
1411 | nr_pages++; |
1412 | ||
1413 | ret = snapshot_write_next(snapshot); | |
1414 | if (ret <= 0) { | |
1415 | crc->run_threads = thr + 1; | |
1416 | atomic_set(&crc->ready, 1); | |
1417 | wake_up(&crc->go); | |
1418 | goto out_finish; | |
1419 | } | |
1420 | } | |
f996fc96 | 1421 | } |
081a9d04 BS |
1422 | |
1423 | crc->run_threads = thr; | |
1424 | atomic_set(&crc->ready, 1); | |
1425 | wake_up(&crc->go); | |
f996fc96 BS |
1426 | } |
1427 | ||
1428 | out_finish: | |
081a9d04 BS |
1429 | if (crc->run_threads) { |
1430 | wait_event(crc->done, atomic_read(&crc->stop)); | |
1431 | atomic_set(&crc->stop, 0); | |
1432 | } | |
db597605 | 1433 | stop = ktime_get(); |
081a9d04 | 1434 | if (!ret) { |
64ec72a1 | 1435 | pr_info("Image loading done\n"); |
f996fc96 BS |
1436 | snapshot_write_finalize(snapshot); |
1437 | if (!snapshot_image_loaded(snapshot)) | |
081a9d04 BS |
1438 | ret = -ENODATA; |
1439 | if (!ret) { | |
1440 | if (swsusp_header->flags & SF_CRC32_MODE) { | |
1441 | if(handle->crc32 != swsusp_header->crc32) { | |
64ec72a1 | 1442 | pr_err("Invalid image CRC32!\n"); |
081a9d04 BS |
1443 | ret = -ENODATA; |
1444 | } | |
1445 | } | |
1446 | } | |
d8150d35 | 1447 | } |
db597605 | 1448 | swsusp_show_speed(start, stop, nr_to_read, "Read"); |
081a9d04 BS |
1449 | out_clean: |
1450 | for (i = 0; i < ring_size; i++) | |
9f339caf | 1451 | free_page((unsigned long)page[i]); |
081a9d04 BS |
1452 | if (crc) { |
1453 | if (crc->thr) | |
1454 | kthread_stop(crc->thr); | |
1455 | kfree(crc); | |
1456 | } | |
1457 | if (data) { | |
1458 | for (thr = 0; thr < nr_threads; thr++) | |
1459 | if (data[thr].thr) | |
1460 | kthread_stop(data[thr].thr); | |
1461 | vfree(data); | |
1462 | } | |
6c45de0d | 1463 | vfree(page); |
f996fc96 | 1464 | |
081a9d04 | 1465 | return ret; |
f996fc96 BS |
1466 | } |
1467 | ||
a634cc10 RW |
1468 | /** |
1469 | * swsusp_read - read the hibernation image. | |
1470 | * @flags_p: flags passed by the "frozen" kernel in the image header should | |
b595076a | 1471 | * be written into this memory location |
a634cc10 RW |
1472 | */ |
1473 | ||
1474 | int swsusp_read(unsigned int *flags_p) | |
61159a31 RW |
1475 | { |
1476 | int error; | |
1477 | struct swap_map_handle handle; | |
1478 | struct snapshot_handle snapshot; | |
1479 | struct swsusp_info *header; | |
1480 | ||
61159a31 | 1481 | memset(&snapshot, 0, sizeof(struct snapshot_handle)); |
d3c1b24c | 1482 | error = snapshot_write_next(&snapshot); |
d5641c64 | 1483 | if (error < (int)PAGE_SIZE) |
61159a31 RW |
1484 | return error < 0 ? error : -EFAULT; |
1485 | header = (struct swsusp_info *)data_of(snapshot); | |
6f612af5 JS |
1486 | error = get_swap_reader(&handle, flags_p); |
1487 | if (error) | |
1488 | goto end; | |
61159a31 | 1489 | if (!error) |
546e0d27 | 1490 | error = swap_read_page(&handle, header, NULL); |
f996fc96 BS |
1491 | if (!error) { |
1492 | error = (*flags_p & SF_NOCOMPRESS_MODE) ? | |
1493 | load_image(&handle, &snapshot, header->pages - 1) : | |
1494 | load_image_lzo(&handle, &snapshot, header->pages - 1); | |
1495 | } | |
6f612af5 JS |
1496 | swap_reader_finish(&handle); |
1497 | end: | |
61159a31 | 1498 | if (!error) |
64ec72a1 | 1499 | pr_debug("Image successfully loaded\n"); |
61159a31 | 1500 | else |
64ec72a1 | 1501 | pr_debug("Error %d resuming\n", error); |
61159a31 RW |
1502 | return error; |
1503 | } | |
1504 | ||
1505 | /** | |
1506 | * swsusp_check - Check for swsusp signature in the resume device | |
1507 | */ | |
1508 | ||
1509 | int swsusp_check(void) | |
1510 | { | |
1511 | int error; | |
1512 | ||
d4d77629 TH |
1513 | hib_resume_bdev = blkdev_get_by_dev(swsusp_resume_device, |
1514 | FMODE_READ, NULL); | |
8a0d613f JS |
1515 | if (!IS_ERR(hib_resume_bdev)) { |
1516 | set_blocksize(hib_resume_bdev, PAGE_SIZE); | |
3ecb01df | 1517 | clear_page(swsusp_header); |
70fd7614 | 1518 | error = hib_submit_io(REQ_OP_READ, 0, |
162b99e3 | 1519 | swsusp_resume_block, |
1b29c164 | 1520 | swsusp_header, NULL); |
9a154d9d | 1521 | if (error) |
76b57e61 | 1522 | goto put; |
9a154d9d | 1523 | |
3624eb04 | 1524 | if (!memcmp(HIBERNATE_SIG, swsusp_header->sig, 10)) { |
1b29c164 | 1525 | memcpy(swsusp_header->sig, swsusp_header->orig_sig, 10); |
61159a31 | 1526 | /* Reset swap signature now */ |
70fd7614 | 1527 | error = hib_submit_io(REQ_OP_WRITE, REQ_SYNC, |
162b99e3 | 1528 | swsusp_resume_block, |
1b29c164 | 1529 | swsusp_header, NULL); |
61159a31 | 1530 | } else { |
76b57e61 | 1531 | error = -EINVAL; |
61159a31 | 1532 | } |
76b57e61 JS |
1533 | |
1534 | put: | |
61159a31 | 1535 | if (error) |
8a0d613f | 1536 | blkdev_put(hib_resume_bdev, FMODE_READ); |
61159a31 | 1537 | else |
64ec72a1 | 1538 | pr_debug("Image signature found, resuming\n"); |
61159a31 | 1539 | } else { |
8a0d613f | 1540 | error = PTR_ERR(hib_resume_bdev); |
61159a31 RW |
1541 | } |
1542 | ||
1543 | if (error) | |
64ec72a1 | 1544 | pr_debug("Image not found (code %d)\n", error); |
61159a31 RW |
1545 | |
1546 | return error; | |
1547 | } | |
1548 | ||
1549 | /** | |
1550 | * swsusp_close - close swap device. | |
1551 | */ | |
1552 | ||
c2dd0dae | 1553 | void swsusp_close(fmode_t mode) |
61159a31 | 1554 | { |
8a0d613f | 1555 | if (IS_ERR(hib_resume_bdev)) { |
64ec72a1 | 1556 | pr_debug("Image device not initialised\n"); |
61159a31 RW |
1557 | return; |
1558 | } | |
1559 | ||
8a0d613f | 1560 | blkdev_put(hib_resume_bdev, mode); |
61159a31 | 1561 | } |
1b29c164 | 1562 | |
62c552cc BS |
1563 | /** |
1564 | * swsusp_unmark - Unmark swsusp signature in the resume device | |
1565 | */ | |
1566 | ||
1567 | #ifdef CONFIG_SUSPEND | |
1568 | int swsusp_unmark(void) | |
1569 | { | |
1570 | int error; | |
1571 | ||
70fd7614 | 1572 | hib_submit_io(REQ_OP_READ, 0, swsusp_resume_block, |
162b99e3 | 1573 | swsusp_header, NULL); |
62c552cc BS |
1574 | if (!memcmp(HIBERNATE_SIG,swsusp_header->sig, 10)) { |
1575 | memcpy(swsusp_header->sig,swsusp_header->orig_sig, 10); | |
70fd7614 | 1576 | error = hib_submit_io(REQ_OP_WRITE, REQ_SYNC, |
162b99e3 | 1577 | swsusp_resume_block, |
62c552cc BS |
1578 | swsusp_header, NULL); |
1579 | } else { | |
64ec72a1 | 1580 | pr_err("Cannot find swsusp signature!\n"); |
62c552cc BS |
1581 | error = -ENODEV; |
1582 | } | |
1583 | ||
1584 | /* | |
1585 | * We just returned from suspend, we don't need the image any more. | |
1586 | */ | |
1587 | free_all_swap_pages(root_swap); | |
1588 | ||
1589 | return error; | |
1590 | } | |
1591 | #endif | |
1592 | ||
1b29c164 VG |
1593 | static int swsusp_header_init(void) |
1594 | { | |
1595 | swsusp_header = (struct swsusp_header*) __get_free_page(GFP_KERNEL); | |
1596 | if (!swsusp_header) | |
1597 | panic("Could not allocate memory for swsusp_header\n"); | |
1598 | return 0; | |
1599 | } | |
1600 | ||
1601 | core_initcall(swsusp_header_init); |