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authorRafael J. Wysocki <rjw@sisk.pl>2006-12-06 23:34:09 -0500
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-07 11:39:27 -0500
commit3fc6b34f4803b959c1e30c15247e2180cd529115 (patch)
tree1a867b3224db5e890ca23858c90f4ac33cb9c606 /kernel/power/swap.c
parent915bae9ebe41e52d71ad8b06d50e4ab26189f964 (diff)
[PATCH] swsusp: rearrange swap-handling code
Rearrange the code in kernel/power/swap.c so that the next patch is more readable. [This patch only moves the existing code.] Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/power/swap.c')
-rw-r--r--kernel/power/swap.c221
1 files changed, 112 insertions, 109 deletions
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index 7b10da16389e..7768c2ba7550 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -41,10 +41,121 @@ static struct swsusp_header {
41} __attribute__((packed, aligned(PAGE_SIZE))) swsusp_header; 41} __attribute__((packed, aligned(PAGE_SIZE))) swsusp_header;
42 42
43/* 43/*
44 * Saving part... 44 * General things
45 */ 45 */
46 46
47static unsigned short root_swap = 0xffff; 47static unsigned short root_swap = 0xffff;
48static struct block_device *resume_bdev;
49
50/**
51 * submit - submit BIO request.
52 * @rw: READ or WRITE.
53 * @off physical offset of page.
54 * @page: page we're reading or writing.
55 * @bio_chain: list of pending biod (for async reading)
56 *
57 * Straight from the textbook - allocate and initialize the bio.
58 * If we're reading, make sure the page is marked as dirty.
59 * Then submit it and, if @bio_chain == NULL, wait.
60 */
61static int submit(int rw, pgoff_t page_off, struct page *page,
62 struct bio **bio_chain)
63{
64 struct bio *bio;
65
66 bio = bio_alloc(GFP_ATOMIC, 1);
67 if (!bio)
68 return -ENOMEM;
69 bio->bi_sector = page_off * (PAGE_SIZE >> 9);
70 bio->bi_bdev = resume_bdev;
71 bio->bi_end_io = end_swap_bio_read;
72
73 if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
74 printk("swsusp: ERROR: adding page to bio at %ld\n", page_off);
75 bio_put(bio);
76 return -EFAULT;
77 }
78
79 lock_page(page);
80 bio_get(bio);
81
82 if (bio_chain == NULL) {
83 submit_bio(rw | (1 << BIO_RW_SYNC), bio);
84 wait_on_page_locked(page);
85 if (rw == READ)
86 bio_set_pages_dirty(bio);
87 bio_put(bio);
88 } else {
89 if (rw == READ)
90 get_page(page); /* These pages are freed later */
91 bio->bi_private = *bio_chain;
92 *bio_chain = bio;
93 submit_bio(rw | (1 << BIO_RW_SYNC), bio);
94 }
95 return 0;
96}
97
98static int bio_read_page(pgoff_t page_off, void *addr, struct bio **bio_chain)
99{
100 return submit(READ, page_off, virt_to_page(addr), bio_chain);
101}
102
103static int bio_write_page(pgoff_t page_off, void *addr)
104{
105 return submit(WRITE, page_off, virt_to_page(addr), NULL);
106}
107
108static int wait_on_bio_chain(struct bio **bio_chain)
109{
110 struct bio *bio;
111 struct bio *next_bio;
112 int ret = 0;
113
114 if (bio_chain == NULL)
115 return 0;
116
117 bio = *bio_chain;
118 if (bio == NULL)
119 return 0;
120 while (bio) {
121 struct page *page;
122
123 next_bio = bio->bi_private;
124 page = bio->bi_io_vec[0].bv_page;
125 wait_on_page_locked(page);
126 if (!PageUptodate(page) || PageError(page))
127 ret = -EIO;
128 put_page(page);
129 bio_put(bio);
130 bio = next_bio;
131 }
132 *bio_chain = NULL;
133 return ret;
134}
135
136static void show_speed(struct timeval *start, struct timeval *stop,
137 unsigned nr_pages, char *msg)
138{
139 s64 elapsed_centisecs64;
140 int centisecs;
141 int k;
142 int kps;
143
144 elapsed_centisecs64 = timeval_to_ns(stop) - timeval_to_ns(start);
145 do_div(elapsed_centisecs64, NSEC_PER_SEC / 100);
146 centisecs = elapsed_centisecs64;
147 if (centisecs == 0)
148 centisecs = 1; /* avoid div-by-zero */
149 k = nr_pages * (PAGE_SIZE / 1024);
150 kps = (k * 100) / centisecs;
151 printk("%s %d kbytes in %d.%02d seconds (%d.%02d MB/s)\n", msg, k,
152 centisecs / 100, centisecs % 100,
153 kps / 1000, (kps % 1000) / 10);
154}
155
156/*
157 * Saving part
158 */
48 159
49static int mark_swapfiles(swp_entry_t start) 160static int mark_swapfiles(swp_entry_t start)
50{ 161{
@@ -166,26 +277,6 @@ static void release_swap_writer(struct swap_map_handle *handle)
166 handle->bitmap = NULL; 277 handle->bitmap = NULL;
167} 278}
168 279
169static void show_speed(struct timeval *start, struct timeval *stop,
170 unsigned nr_pages, char *msg)
171{
172 s64 elapsed_centisecs64;
173 int centisecs;
174 int k;
175 int kps;
176
177 elapsed_centisecs64 = timeval_to_ns(stop) - timeval_to_ns(start);
178 do_div(elapsed_centisecs64, NSEC_PER_SEC / 100);
179 centisecs = elapsed_centisecs64;
180 if (centisecs == 0)
181 centisecs = 1; /* avoid div-by-zero */
182 k = nr_pages * (PAGE_SIZE / 1024);
183 kps = (k * 100) / centisecs;
184 printk("%s %d kbytes in %d.%02d seconds (%d.%02d MB/s)\n", msg, k,
185 centisecs / 100, centisecs % 100,
186 kps / 1000, (kps % 1000) / 10);
187}
188
189static int get_swap_writer(struct swap_map_handle *handle) 280static int get_swap_writer(struct swap_map_handle *handle)
190{ 281{
191 handle->cur = (struct swap_map_page *)get_zeroed_page(GFP_KERNEL); 282 handle->cur = (struct swap_map_page *)get_zeroed_page(GFP_KERNEL);
@@ -205,34 +296,6 @@ static int get_swap_writer(struct swap_map_handle *handle)
205 return 0; 296 return 0;
206} 297}
207 298
208static int wait_on_bio_chain(struct bio **bio_chain)
209{
210 struct bio *bio;
211 struct bio *next_bio;
212 int ret = 0;
213
214 if (bio_chain == NULL)
215 return 0;
216
217 bio = *bio_chain;
218 if (bio == NULL)
219 return 0;
220 while (bio) {
221 struct page *page;
222
223 next_bio = bio->bi_private;
224 page = bio->bi_io_vec[0].bv_page;
225 wait_on_page_locked(page);
226 if (!PageUptodate(page) || PageError(page))
227 ret = -EIO;
228 put_page(page);
229 bio_put(bio);
230 bio = next_bio;
231 }
232 *bio_chain = NULL;
233 return ret;
234}
235
236static int swap_write_page(struct swap_map_handle *handle, void *buf, 299static int swap_write_page(struct swap_map_handle *handle, void *buf,
237 struct bio **bio_chain) 300 struct bio **bio_chain)
238{ 301{
@@ -384,66 +447,6 @@ int swsusp_write(void)
384 return error; 447 return error;
385} 448}
386 449
387static struct block_device *resume_bdev;
388
389/**
390 * submit - submit BIO request.
391 * @rw: READ or WRITE.
392 * @off physical offset of page.
393 * @page: page we're reading or writing.
394 * @bio_chain: list of pending biod (for async reading)
395 *
396 * Straight from the textbook - allocate and initialize the bio.
397 * If we're reading, make sure the page is marked as dirty.
398 * Then submit it and, if @bio_chain == NULL, wait.
399 */
400static int submit(int rw, pgoff_t page_off, struct page *page,
401 struct bio **bio_chain)
402{
403 struct bio *bio;
404
405 bio = bio_alloc(GFP_ATOMIC, 1);
406 if (!bio)
407 return -ENOMEM;
408 bio->bi_sector = page_off * (PAGE_SIZE >> 9);
409 bio->bi_bdev = resume_bdev;
410 bio->bi_end_io = end_swap_bio_read;
411
412 if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
413 printk("swsusp: ERROR: adding page to bio at %ld\n", page_off);
414 bio_put(bio);
415 return -EFAULT;
416 }
417
418 lock_page(page);
419 bio_get(bio);
420
421 if (bio_chain == NULL) {
422 submit_bio(rw | (1 << BIO_RW_SYNC), bio);
423 wait_on_page_locked(page);
424 if (rw == READ)
425 bio_set_pages_dirty(bio);
426 bio_put(bio);
427 } else {
428 if (rw == READ)
429 get_page(page); /* These pages are freed later */
430 bio->bi_private = *bio_chain;
431 *bio_chain = bio;
432 submit_bio(rw | (1 << BIO_RW_SYNC), bio);
433 }
434 return 0;
435}
436
437static int bio_read_page(pgoff_t page_off, void *addr, struct bio **bio_chain)
438{
439 return submit(READ, page_off, virt_to_page(addr), bio_chain);
440}
441
442static int bio_write_page(pgoff_t page_off, void *addr)
443{
444 return submit(WRITE, page_off, virt_to_page(addr), NULL);
445}
446
447/** 450/**
448 * The following functions allow us to read data using a swap map 451 * The following functions allow us to read data using a swap map
449 * in a file-alike way 452 * in a file-alike way
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-11 06:40:33 -0500