]>
Commit | Line | Data |
---|---|---|
61159a31 RW |
1 | /* |
2 | * linux/kernel/power/swap.c | |
3 | * | |
4 | * This file provides functions for reading the suspend image from | |
5 | * and writing it to a swap partition. | |
6 | * | |
7 | * Copyright (C) 1998,2001-2005 Pavel Machek <pavel@suse.cz> | |
8 | * Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl> | |
9 | * | |
10 | * This file is released under the GPLv2. | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <linux/module.h> | |
61159a31 | 15 | #include <linux/file.h> |
61159a31 RW |
16 | #include <linux/delay.h> |
17 | #include <linux/bitops.h> | |
18 | #include <linux/genhd.h> | |
19 | #include <linux/device.h> | |
20 | #include <linux/buffer_head.h> | |
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> |
61159a31 RW |
27 | |
28 | #include "power.h" | |
29 | ||
61159a31 RW |
30 | #define SWSUSP_SIG "S1SUSPEND" |
31 | ||
51fb352b JS |
32 | /* |
33 | * The swap map is a data structure used for keeping track of each page | |
34 | * written to a swap partition. It consists of many swap_map_page | |
35 | * structures that contain each an array of MAP_PAGE_SIZE swap entries. | |
36 | * These structures are stored on the swap and linked together with the | |
37 | * help of the .next_swap member. | |
38 | * | |
39 | * The swap map is created during suspend. The swap map pages are | |
40 | * allocated and populated one at a time, so we only need one memory | |
41 | * page to set up the entire structure. | |
42 | * | |
43 | * During resume we also only need to use one swap_map_page structure | |
44 | * at a time. | |
45 | */ | |
46 | ||
47 | #define MAP_PAGE_ENTRIES (PAGE_SIZE / sizeof(sector_t) - 1) | |
48 | ||
49 | struct swap_map_page { | |
50 | sector_t entries[MAP_PAGE_ENTRIES]; | |
51 | sector_t next_swap; | |
52 | }; | |
53 | ||
54 | /** | |
55 | * The swap_map_handle structure is used for handling swap in | |
56 | * a file-alike way | |
57 | */ | |
58 | ||
59 | struct swap_map_handle { | |
60 | struct swap_map_page *cur; | |
61 | sector_t cur_swap; | |
62 | sector_t first_sector; | |
63 | unsigned int k; | |
64 | }; | |
65 | ||
1b29c164 | 66 | struct swsusp_header { |
a634cc10 | 67 | char reserved[PAGE_SIZE - 20 - sizeof(sector_t) - sizeof(int)]; |
3aef83e0 | 68 | sector_t image; |
a634cc10 | 69 | unsigned int flags; /* Flags to pass to the "boot" kernel */ |
61159a31 RW |
70 | char orig_sig[10]; |
71 | char sig[10]; | |
1b29c164 VG |
72 | } __attribute__((packed)); |
73 | ||
74 | static struct swsusp_header *swsusp_header; | |
61159a31 | 75 | |
0414f2ec NC |
76 | /** |
77 | * The following functions are used for tracing the allocated | |
78 | * swap pages, so that they can be freed in case of an error. | |
79 | */ | |
80 | ||
81 | struct swsusp_extent { | |
82 | struct rb_node node; | |
83 | unsigned long start; | |
84 | unsigned long end; | |
85 | }; | |
86 | ||
87 | static struct rb_root swsusp_extents = RB_ROOT; | |
88 | ||
89 | static int swsusp_extents_insert(unsigned long swap_offset) | |
90 | { | |
91 | struct rb_node **new = &(swsusp_extents.rb_node); | |
92 | struct rb_node *parent = NULL; | |
93 | struct swsusp_extent *ext; | |
94 | ||
95 | /* Figure out where to put the new node */ | |
96 | while (*new) { | |
97 | ext = container_of(*new, struct swsusp_extent, node); | |
98 | parent = *new; | |
99 | if (swap_offset < ext->start) { | |
100 | /* Try to merge */ | |
101 | if (swap_offset == ext->start - 1) { | |
102 | ext->start--; | |
103 | return 0; | |
104 | } | |
105 | new = &((*new)->rb_left); | |
106 | } else if (swap_offset > ext->end) { | |
107 | /* Try to merge */ | |
108 | if (swap_offset == ext->end + 1) { | |
109 | ext->end++; | |
110 | return 0; | |
111 | } | |
112 | new = &((*new)->rb_right); | |
113 | } else { | |
114 | /* It already is in the tree */ | |
115 | return -EINVAL; | |
116 | } | |
117 | } | |
118 | /* Add the new node and rebalance the tree. */ | |
119 | ext = kzalloc(sizeof(struct swsusp_extent), GFP_KERNEL); | |
120 | if (!ext) | |
121 | return -ENOMEM; | |
122 | ||
123 | ext->start = swap_offset; | |
124 | ext->end = swap_offset; | |
125 | rb_link_node(&ext->node, parent, new); | |
126 | rb_insert_color(&ext->node, &swsusp_extents); | |
127 | return 0; | |
128 | } | |
129 | ||
130 | /** | |
131 | * alloc_swapdev_block - allocate a swap page and register that it has | |
132 | * been allocated, so that it can be freed in case of an error. | |
133 | */ | |
134 | ||
135 | sector_t alloc_swapdev_block(int swap) | |
136 | { | |
137 | unsigned long offset; | |
138 | ||
139 | offset = swp_offset(get_swap_page_of_type(swap)); | |
140 | if (offset) { | |
141 | if (swsusp_extents_insert(offset)) | |
142 | swap_free(swp_entry(swap, offset)); | |
143 | else | |
144 | return swapdev_block(swap, offset); | |
145 | } | |
146 | return 0; | |
147 | } | |
148 | ||
149 | /** | |
150 | * free_all_swap_pages - free swap pages allocated for saving image data. | |
151 | * It also frees the extents used to register which swap entres had been | |
152 | * allocated. | |
153 | */ | |
154 | ||
155 | void free_all_swap_pages(int swap) | |
156 | { | |
157 | struct rb_node *node; | |
158 | ||
159 | while ((node = swsusp_extents.rb_node)) { | |
160 | struct swsusp_extent *ext; | |
161 | unsigned long offset; | |
162 | ||
163 | ext = container_of(node, struct swsusp_extent, node); | |
164 | rb_erase(node, &swsusp_extents); | |
165 | for (offset = ext->start; offset <= ext->end; offset++) | |
166 | swap_free(swp_entry(swap, offset)); | |
167 | ||
168 | kfree(ext); | |
169 | } | |
170 | } | |
171 | ||
172 | int swsusp_swap_in_use(void) | |
173 | { | |
174 | return (swsusp_extents.rb_node != NULL); | |
175 | } | |
176 | ||
61159a31 | 177 | /* |
3fc6b34f | 178 | * General things |
61159a31 RW |
179 | */ |
180 | ||
181 | static unsigned short root_swap = 0xffff; | |
8a0d613f | 182 | struct block_device *hib_resume_bdev; |
3fc6b34f | 183 | |
3fc6b34f RW |
184 | /* |
185 | * Saving part | |
186 | */ | |
61159a31 | 187 | |
51fb352b | 188 | static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags) |
61159a31 RW |
189 | { |
190 | int error; | |
191 | ||
8a0d613f | 192 | hib_bio_read_page(swsusp_resume_block, swsusp_header, NULL); |
1b29c164 VG |
193 | if (!memcmp("SWAP-SPACE",swsusp_header->sig, 10) || |
194 | !memcmp("SWAPSPACE2",swsusp_header->sig, 10)) { | |
195 | memcpy(swsusp_header->orig_sig,swsusp_header->sig, 10); | |
196 | memcpy(swsusp_header->sig,SWSUSP_SIG, 10); | |
51fb352b | 197 | swsusp_header->image = handle->first_sector; |
a634cc10 | 198 | swsusp_header->flags = flags; |
8a0d613f | 199 | error = hib_bio_write_page(swsusp_resume_block, |
1b29c164 | 200 | swsusp_header, NULL); |
61159a31 | 201 | } else { |
23976728 | 202 | printk(KERN_ERR "PM: Swap header not found!\n"); |
61159a31 RW |
203 | error = -ENODEV; |
204 | } | |
205 | return error; | |
206 | } | |
207 | ||
208 | /** | |
209 | * swsusp_swap_check - check if the resume device is a swap device | |
210 | * and get its index (if so) | |
6f612af5 JS |
211 | * |
212 | * This is called before saving image | |
61159a31 | 213 | */ |
6f612af5 | 214 | static int swsusp_swap_check(void) |
61159a31 | 215 | { |
3aef83e0 RW |
216 | int res; |
217 | ||
7bf23687 | 218 | res = swap_type_of(swsusp_resume_device, swsusp_resume_block, |
8a0d613f | 219 | &hib_resume_bdev); |
3aef83e0 RW |
220 | if (res < 0) |
221 | return res; | |
222 | ||
223 | root_swap = res; | |
8a0d613f | 224 | res = blkdev_get(hib_resume_bdev, FMODE_WRITE); |
7bf23687 RW |
225 | if (res) |
226 | return res; | |
3aef83e0 | 227 | |
8a0d613f | 228 | res = set_blocksize(hib_resume_bdev, PAGE_SIZE); |
3aef83e0 | 229 | if (res < 0) |
8a0d613f | 230 | blkdev_put(hib_resume_bdev, FMODE_WRITE); |
61159a31 | 231 | |
61159a31 RW |
232 | return res; |
233 | } | |
234 | ||
235 | /** | |
236 | * write_page - Write one page to given swap location. | |
237 | * @buf: Address we're writing. | |
238 | * @offset: Offset of the swap page we're writing to. | |
ab954160 | 239 | * @bio_chain: Link the next write BIO here |
61159a31 RW |
240 | */ |
241 | ||
3aef83e0 | 242 | static int write_page(void *buf, sector_t offset, struct bio **bio_chain) |
61159a31 | 243 | { |
3aef83e0 RW |
244 | void *src; |
245 | ||
246 | if (!offset) | |
247 | return -ENOSPC; | |
248 | ||
249 | if (bio_chain) { | |
85949121 | 250 | src = (void *)__get_free_page(__GFP_WAIT | __GFP_HIGH); |
3aef83e0 RW |
251 | if (src) { |
252 | memcpy(src, buf, PAGE_SIZE); | |
253 | } else { | |
254 | WARN_ON_ONCE(1); | |
255 | bio_chain = NULL; /* Go synchronous */ | |
256 | src = buf; | |
ab954160 | 257 | } |
3aef83e0 RW |
258 | } else { |
259 | src = buf; | |
61159a31 | 260 | } |
8a0d613f | 261 | return hib_bio_write_page(offset, src, bio_chain); |
61159a31 RW |
262 | } |
263 | ||
61159a31 RW |
264 | static void release_swap_writer(struct swap_map_handle *handle) |
265 | { | |
266 | if (handle->cur) | |
267 | free_page((unsigned long)handle->cur); | |
268 | handle->cur = NULL; | |
61159a31 RW |
269 | } |
270 | ||
271 | static int get_swap_writer(struct swap_map_handle *handle) | |
272 | { | |
6f612af5 JS |
273 | int ret; |
274 | ||
275 | ret = swsusp_swap_check(); | |
276 | if (ret) { | |
277 | if (ret != -ENOSPC) | |
278 | printk(KERN_ERR "PM: Cannot find swap device, try " | |
279 | "swapon -a.\n"); | |
280 | return ret; | |
281 | } | |
61159a31 | 282 | handle->cur = (struct swap_map_page *)get_zeroed_page(GFP_KERNEL); |
6f612af5 JS |
283 | if (!handle->cur) { |
284 | ret = -ENOMEM; | |
285 | goto err_close; | |
286 | } | |
d1d241cc | 287 | handle->cur_swap = alloc_swapdev_block(root_swap); |
61159a31 | 288 | if (!handle->cur_swap) { |
6f612af5 JS |
289 | ret = -ENOSPC; |
290 | goto err_rel; | |
61159a31 RW |
291 | } |
292 | handle->k = 0; | |
51fb352b | 293 | handle->first_sector = handle->cur_swap; |
61159a31 | 294 | return 0; |
6f612af5 JS |
295 | err_rel: |
296 | release_swap_writer(handle); | |
297 | err_close: | |
298 | swsusp_close(FMODE_WRITE); | |
299 | return ret; | |
61159a31 RW |
300 | } |
301 | ||
ab954160 AM |
302 | static int swap_write_page(struct swap_map_handle *handle, void *buf, |
303 | struct bio **bio_chain) | |
304 | { | |
305 | int error = 0; | |
3aef83e0 | 306 | sector_t offset; |
61159a31 RW |
307 | |
308 | if (!handle->cur) | |
309 | return -EINVAL; | |
d1d241cc | 310 | offset = alloc_swapdev_block(root_swap); |
ab954160 | 311 | error = write_page(buf, offset, bio_chain); |
61159a31 RW |
312 | if (error) |
313 | return error; | |
314 | handle->cur->entries[handle->k++] = offset; | |
315 | if (handle->k >= MAP_PAGE_ENTRIES) { | |
8a0d613f | 316 | error = hib_wait_on_bio_chain(bio_chain); |
ab954160 AM |
317 | if (error) |
318 | goto out; | |
d1d241cc | 319 | offset = alloc_swapdev_block(root_swap); |
61159a31 RW |
320 | if (!offset) |
321 | return -ENOSPC; | |
322 | handle->cur->next_swap = offset; | |
ab954160 | 323 | error = write_page(handle->cur, handle->cur_swap, NULL); |
61159a31 | 324 | if (error) |
ab954160 | 325 | goto out; |
61159a31 RW |
326 | memset(handle->cur, 0, PAGE_SIZE); |
327 | handle->cur_swap = offset; | |
328 | handle->k = 0; | |
329 | } | |
59a49335 | 330 | out: |
ab954160 | 331 | return error; |
61159a31 RW |
332 | } |
333 | ||
334 | static int flush_swap_writer(struct swap_map_handle *handle) | |
335 | { | |
336 | if (handle->cur && handle->cur_swap) | |
ab954160 | 337 | return write_page(handle->cur, handle->cur_swap, NULL); |
61159a31 RW |
338 | else |
339 | return -EINVAL; | |
340 | } | |
341 | ||
6f612af5 JS |
342 | static int swap_writer_finish(struct swap_map_handle *handle, |
343 | unsigned int flags, int error) | |
344 | { | |
345 | if (!error) { | |
346 | flush_swap_writer(handle); | |
347 | printk(KERN_INFO "PM: S"); | |
348 | error = mark_swapfiles(handle, flags); | |
349 | printk("|\n"); | |
350 | } | |
351 | ||
352 | if (error) | |
353 | free_all_swap_pages(root_swap); | |
354 | release_swap_writer(handle); | |
355 | swsusp_close(FMODE_WRITE); | |
356 | ||
357 | return error; | |
358 | } | |
359 | ||
61159a31 RW |
360 | /** |
361 | * save_image - save the suspend image data | |
362 | */ | |
363 | ||
364 | static int save_image(struct swap_map_handle *handle, | |
365 | struct snapshot_handle *snapshot, | |
3a4f7577 | 366 | unsigned int nr_to_write) |
61159a31 RW |
367 | { |
368 | unsigned int m; | |
369 | int ret; | |
3a4f7577 | 370 | int nr_pages; |
ab954160 AM |
371 | int err2; |
372 | struct bio *bio; | |
3a4f7577 AM |
373 | struct timeval start; |
374 | struct timeval stop; | |
61159a31 | 375 | |
23976728 RW |
376 | printk(KERN_INFO "PM: Saving image data pages (%u pages) ... ", |
377 | nr_to_write); | |
3a4f7577 | 378 | m = nr_to_write / 100; |
61159a31 RW |
379 | if (!m) |
380 | m = 1; | |
381 | nr_pages = 0; | |
ab954160 | 382 | bio = NULL; |
3a4f7577 | 383 | do_gettimeofday(&start); |
4ff277f9 | 384 | while (1) { |
d3c1b24c | 385 | ret = snapshot_read_next(snapshot); |
4ff277f9 JS |
386 | if (ret <= 0) |
387 | break; | |
388 | ret = swap_write_page(handle, data_of(*snapshot), &bio); | |
389 | if (ret) | |
390 | break; | |
391 | if (!(nr_pages % m)) | |
66d0ae4d | 392 | printk(KERN_CONT "\b\b\b\b%3d%%", nr_pages / m); |
4ff277f9 JS |
393 | nr_pages++; |
394 | } | |
8a0d613f | 395 | err2 = hib_wait_on_bio_chain(&bio); |
3a4f7577 | 396 | do_gettimeofday(&stop); |
4ff277f9 JS |
397 | if (!ret) |
398 | ret = err2; | |
399 | if (!ret) | |
66d0ae4d | 400 | printk(KERN_CONT "\b\b\b\bdone\n"); |
4ff277f9 | 401 | else |
66d0ae4d | 402 | printk(KERN_CONT "\n"); |
0d3a9abe | 403 | swsusp_show_speed(&start, &stop, nr_to_write, "Wrote"); |
4ff277f9 | 404 | return ret; |
61159a31 RW |
405 | } |
406 | ||
407 | /** | |
408 | * enough_swap - Make sure we have enough swap to save the image. | |
409 | * | |
410 | * Returns TRUE or FALSE after checking the total amount of swap | |
411 | * space avaiable from the resume partition. | |
412 | */ | |
413 | ||
414 | static int enough_swap(unsigned int nr_pages) | |
415 | { | |
416 | unsigned int free_swap = count_swap_pages(root_swap, 1); | |
417 | ||
23976728 | 418 | pr_debug("PM: Free swap pages: %u\n", free_swap); |
940864dd | 419 | return free_swap > nr_pages + PAGES_FOR_IO; |
61159a31 RW |
420 | } |
421 | ||
422 | /** | |
423 | * swsusp_write - Write entire image and metadata. | |
a634cc10 | 424 | * @flags: flags to pass to the "boot" kernel in the image header |
61159a31 RW |
425 | * |
426 | * It is important _NOT_ to umount filesystems at this point. We want | |
427 | * them synced (in case something goes wrong) but we DO not want to mark | |
428 | * filesystem clean: it is not. (And it does not matter, if we resume | |
429 | * correctly, we'll mark system clean, anyway.) | |
430 | */ | |
431 | ||
a634cc10 | 432 | int swsusp_write(unsigned int flags) |
61159a31 RW |
433 | { |
434 | struct swap_map_handle handle; | |
435 | struct snapshot_handle snapshot; | |
436 | struct swsusp_info *header; | |
6f612af5 | 437 | unsigned long pages; |
61159a31 RW |
438 | int error; |
439 | ||
6f612af5 JS |
440 | pages = snapshot_get_image_size(); |
441 | error = get_swap_writer(&handle); | |
3aef83e0 | 442 | if (error) { |
6f612af5 | 443 | printk(KERN_ERR "PM: Cannot get swap writer\n"); |
61159a31 RW |
444 | return error; |
445 | } | |
6f612af5 JS |
446 | if (!enough_swap(pages)) { |
447 | printk(KERN_ERR "PM: Not enough free swap\n"); | |
448 | error = -ENOSPC; | |
449 | goto out_finish; | |
450 | } | |
61159a31 | 451 | memset(&snapshot, 0, sizeof(struct snapshot_handle)); |
d3c1b24c | 452 | error = snapshot_read_next(&snapshot); |
3aef83e0 RW |
453 | if (error < PAGE_SIZE) { |
454 | if (error >= 0) | |
455 | error = -EFAULT; | |
456 | ||
6f612af5 | 457 | goto out_finish; |
3aef83e0 | 458 | } |
61159a31 | 459 | header = (struct swsusp_info *)data_of(snapshot); |
6f612af5 JS |
460 | error = swap_write_page(&handle, header, NULL); |
461 | if (!error) | |
462 | error = save_image(&handle, &snapshot, pages - 1); | |
463 | out_finish: | |
464 | error = swap_writer_finish(&handle, flags, error); | |
61159a31 RW |
465 | return error; |
466 | } | |
467 | ||
61159a31 RW |
468 | /** |
469 | * The following functions allow us to read data using a swap map | |
470 | * in a file-alike way | |
471 | */ | |
472 | ||
473 | static void release_swap_reader(struct swap_map_handle *handle) | |
474 | { | |
475 | if (handle->cur) | |
476 | free_page((unsigned long)handle->cur); | |
477 | handle->cur = NULL; | |
478 | } | |
479 | ||
6f612af5 JS |
480 | static int get_swap_reader(struct swap_map_handle *handle, |
481 | unsigned int *flags_p) | |
61159a31 RW |
482 | { |
483 | int error; | |
484 | ||
6f612af5 JS |
485 | *flags_p = swsusp_header->flags; |
486 | ||
487 | if (!swsusp_header->image) /* how can this happen? */ | |
61159a31 | 488 | return -EINVAL; |
3aef83e0 | 489 | |
85949121 | 490 | handle->cur = (struct swap_map_page *)get_zeroed_page(__GFP_WAIT | __GFP_HIGH); |
61159a31 RW |
491 | if (!handle->cur) |
492 | return -ENOMEM; | |
3aef83e0 | 493 | |
6f612af5 | 494 | error = hib_bio_read_page(swsusp_header->image, handle->cur, NULL); |
61159a31 RW |
495 | if (error) { |
496 | release_swap_reader(handle); | |
497 | return error; | |
498 | } | |
499 | handle->k = 0; | |
500 | return 0; | |
501 | } | |
502 | ||
546e0d27 AM |
503 | static int swap_read_page(struct swap_map_handle *handle, void *buf, |
504 | struct bio **bio_chain) | |
61159a31 | 505 | { |
3aef83e0 | 506 | sector_t offset; |
61159a31 RW |
507 | int error; |
508 | ||
509 | if (!handle->cur) | |
510 | return -EINVAL; | |
511 | offset = handle->cur->entries[handle->k]; | |
512 | if (!offset) | |
513 | return -EFAULT; | |
8a0d613f | 514 | error = hib_bio_read_page(offset, buf, bio_chain); |
61159a31 RW |
515 | if (error) |
516 | return error; | |
517 | if (++handle->k >= MAP_PAGE_ENTRIES) { | |
8a0d613f | 518 | error = hib_wait_on_bio_chain(bio_chain); |
61159a31 RW |
519 | handle->k = 0; |
520 | offset = handle->cur->next_swap; | |
521 | if (!offset) | |
522 | release_swap_reader(handle); | |
546e0d27 | 523 | else if (!error) |
8a0d613f | 524 | error = hib_bio_read_page(offset, handle->cur, NULL); |
61159a31 RW |
525 | } |
526 | return error; | |
527 | } | |
528 | ||
6f612af5 JS |
529 | static int swap_reader_finish(struct swap_map_handle *handle) |
530 | { | |
531 | release_swap_reader(handle); | |
532 | ||
533 | return 0; | |
534 | } | |
535 | ||
61159a31 RW |
536 | /** |
537 | * load_image - load the image using the swap map handle | |
538 | * @handle and the snapshot handle @snapshot | |
539 | * (assume there are @nr_pages pages to load) | |
540 | */ | |
541 | ||
542 | static int load_image(struct swap_map_handle *handle, | |
543 | struct snapshot_handle *snapshot, | |
546e0d27 | 544 | unsigned int nr_to_read) |
61159a31 RW |
545 | { |
546 | unsigned int m; | |
61159a31 | 547 | int error = 0; |
8c002494 AM |
548 | struct timeval start; |
549 | struct timeval stop; | |
546e0d27 AM |
550 | struct bio *bio; |
551 | int err2; | |
552 | unsigned nr_pages; | |
61159a31 | 553 | |
23976728 RW |
554 | printk(KERN_INFO "PM: Loading image data pages (%u pages) ... ", |
555 | nr_to_read); | |
546e0d27 | 556 | m = nr_to_read / 100; |
61159a31 RW |
557 | if (!m) |
558 | m = 1; | |
559 | nr_pages = 0; | |
546e0d27 | 560 | bio = NULL; |
8c002494 | 561 | do_gettimeofday(&start); |
546e0d27 | 562 | for ( ; ; ) { |
d3c1b24c | 563 | error = snapshot_write_next(snapshot); |
546e0d27 AM |
564 | if (error <= 0) |
565 | break; | |
566 | error = swap_read_page(handle, data_of(*snapshot), &bio); | |
567 | if (error) | |
568 | break; | |
569 | if (snapshot->sync_read) | |
8a0d613f | 570 | error = hib_wait_on_bio_chain(&bio); |
546e0d27 AM |
571 | if (error) |
572 | break; | |
573 | if (!(nr_pages % m)) | |
574 | printk("\b\b\b\b%3d%%", nr_pages / m); | |
575 | nr_pages++; | |
576 | } | |
8a0d613f | 577 | err2 = hib_wait_on_bio_chain(&bio); |
8c002494 | 578 | do_gettimeofday(&stop); |
546e0d27 AM |
579 | if (!error) |
580 | error = err2; | |
e655a250 | 581 | if (!error) { |
61159a31 | 582 | printk("\b\b\b\bdone\n"); |
8357376d | 583 | snapshot_write_finalize(snapshot); |
e655a250 CK |
584 | if (!snapshot_image_loaded(snapshot)) |
585 | error = -ENODATA; | |
bf9fd67a JS |
586 | } else |
587 | printk("\n"); | |
0d3a9abe | 588 | swsusp_show_speed(&start, &stop, nr_to_read, "Read"); |
61159a31 RW |
589 | return error; |
590 | } | |
591 | ||
a634cc10 RW |
592 | /** |
593 | * swsusp_read - read the hibernation image. | |
594 | * @flags_p: flags passed by the "frozen" kernel in the image header should | |
595 | * be written into this memeory location | |
596 | */ | |
597 | ||
598 | int swsusp_read(unsigned int *flags_p) | |
61159a31 RW |
599 | { |
600 | int error; | |
601 | struct swap_map_handle handle; | |
602 | struct snapshot_handle snapshot; | |
603 | struct swsusp_info *header; | |
604 | ||
61159a31 | 605 | memset(&snapshot, 0, sizeof(struct snapshot_handle)); |
d3c1b24c | 606 | error = snapshot_write_next(&snapshot); |
61159a31 RW |
607 | if (error < PAGE_SIZE) |
608 | return error < 0 ? error : -EFAULT; | |
609 | header = (struct swsusp_info *)data_of(snapshot); | |
6f612af5 JS |
610 | error = get_swap_reader(&handle, flags_p); |
611 | if (error) | |
612 | goto end; | |
61159a31 | 613 | if (!error) |
546e0d27 | 614 | error = swap_read_page(&handle, header, NULL); |
61159a31 RW |
615 | if (!error) |
616 | error = load_image(&handle, &snapshot, header->pages - 1); | |
6f612af5 JS |
617 | swap_reader_finish(&handle); |
618 | end: | |
61159a31 | 619 | if (!error) |
23976728 | 620 | pr_debug("PM: Image successfully loaded\n"); |
61159a31 | 621 | else |
23976728 | 622 | pr_debug("PM: Error %d resuming\n", error); |
61159a31 RW |
623 | return error; |
624 | } | |
625 | ||
626 | /** | |
627 | * swsusp_check - Check for swsusp signature in the resume device | |
628 | */ | |
629 | ||
630 | int swsusp_check(void) | |
631 | { | |
632 | int error; | |
633 | ||
8a0d613f JS |
634 | hib_resume_bdev = open_by_devnum(swsusp_resume_device, FMODE_READ); |
635 | if (!IS_ERR(hib_resume_bdev)) { | |
636 | set_blocksize(hib_resume_bdev, PAGE_SIZE); | |
6373da1f | 637 | memset(swsusp_header, 0, PAGE_SIZE); |
8a0d613f | 638 | error = hib_bio_read_page(swsusp_resume_block, |
1b29c164 | 639 | swsusp_header, NULL); |
9a154d9d | 640 | if (error) |
76b57e61 | 641 | goto put; |
9a154d9d | 642 | |
1b29c164 VG |
643 | if (!memcmp(SWSUSP_SIG, swsusp_header->sig, 10)) { |
644 | memcpy(swsusp_header->sig, swsusp_header->orig_sig, 10); | |
61159a31 | 645 | /* Reset swap signature now */ |
8a0d613f | 646 | error = hib_bio_write_page(swsusp_resume_block, |
1b29c164 | 647 | swsusp_header, NULL); |
61159a31 | 648 | } else { |
76b57e61 | 649 | error = -EINVAL; |
61159a31 | 650 | } |
76b57e61 JS |
651 | |
652 | put: | |
61159a31 | 653 | if (error) |
8a0d613f | 654 | blkdev_put(hib_resume_bdev, FMODE_READ); |
61159a31 | 655 | else |
23976728 | 656 | pr_debug("PM: Signature found, resuming\n"); |
61159a31 | 657 | } else { |
8a0d613f | 658 | error = PTR_ERR(hib_resume_bdev); |
61159a31 RW |
659 | } |
660 | ||
661 | if (error) | |
23976728 | 662 | pr_debug("PM: Error %d checking image file\n", error); |
61159a31 RW |
663 | |
664 | return error; | |
665 | } | |
666 | ||
667 | /** | |
668 | * swsusp_close - close swap device. | |
669 | */ | |
670 | ||
c2dd0dae | 671 | void swsusp_close(fmode_t mode) |
61159a31 | 672 | { |
8a0d613f | 673 | if (IS_ERR(hib_resume_bdev)) { |
23976728 | 674 | pr_debug("PM: Image device not initialised\n"); |
61159a31 RW |
675 | return; |
676 | } | |
677 | ||
8a0d613f | 678 | blkdev_put(hib_resume_bdev, mode); |
61159a31 | 679 | } |
1b29c164 VG |
680 | |
681 | static int swsusp_header_init(void) | |
682 | { | |
683 | swsusp_header = (struct swsusp_header*) __get_free_page(GFP_KERNEL); | |
684 | if (!swsusp_header) | |
685 | panic("Could not allocate memory for swsusp_header\n"); | |
686 | return 0; | |
687 | } | |
688 | ||
689 | core_initcall(swsusp_header_init); |