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-rw-r--r--mm/page_io.c21
1 files changed, 20 insertions, 1 deletions
diff --git a/mm/page_io.c b/mm/page_io.c
index 7c59ef681381..58b50d2901fe 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -248,11 +248,16 @@ out:
248 return ret; 248 return ret;
249} 249}
250 250
251static sector_t swap_page_sector(struct page *page)
252{
253 return (sector_t)__page_file_index(page) << (PAGE_CACHE_SHIFT - 9);
254}
255
251int __swap_writepage(struct page *page, struct writeback_control *wbc, 256int __swap_writepage(struct page *page, struct writeback_control *wbc,
252 void (*end_write_func)(struct bio *, int)) 257 void (*end_write_func)(struct bio *, int))
253{ 258{
254 struct bio *bio; 259 struct bio *bio;
255 int ret = 0, rw = WRITE; 260 int ret, rw = WRITE;
256 struct swap_info_struct *sis = page_swap_info(page); 261 struct swap_info_struct *sis = page_swap_info(page);
257 262
258 if (sis->flags & SWP_FILE) { 263 if (sis->flags & SWP_FILE) {
@@ -297,6 +302,13 @@ int __swap_writepage(struct page *page, struct writeback_control *wbc,
297 return ret; 302 return ret;
298 } 303 }
299 304
305 ret = bdev_write_page(sis->bdev, swap_page_sector(page), page, wbc);
306 if (!ret) {
307 count_vm_event(PSWPOUT);
308 return 0;
309 }
310
311 ret = 0;
300 bio = get_swap_bio(GFP_NOIO, page, end_write_func); 312 bio = get_swap_bio(GFP_NOIO, page, end_write_func);
301 if (bio == NULL) { 313 if (bio == NULL) {
302 set_page_dirty(page); 314 set_page_dirty(page);
@@ -338,6 +350,13 @@ int swap_readpage(struct page *page)
338 return ret; 350 return ret;
339 } 351 }
340 352
353 ret = bdev_read_page(sis->bdev, swap_page_sector(page), page);
354 if (!ret) {
355 count_vm_event(PSWPIN);
356 return 0;
357 }
358
359 ret = 0;
341 bio = get_swap_bio(GFP_KERNEL, page, end_swap_bio_read); 360 bio = get_swap_bio(GFP_KERNEL, page, end_swap_bio_read);
342 if (bio == NULL) { 361 if (bio == NULL) {
343 unlock_page(page); 362 unlock_page(page);