Add support for slice by 8 to existing crc32 algorithm. Also modify

[karo-tx-linux.git] / mm / page_io.c

diff --git a/mm/page_io.c b/mm/page_io.c
index dc76b4d0611ecb59fd85d89a78896c792443a62f..651a912593174b35cee96159a1867c0690a849b3 100644 (file)
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -18,6 +18,7 @@
 #include <linux/bio.h>
 #include <linux/swapops.h>
 #include <linux/writeback.h>
+#include <linux/frontswap.h>
 #include <asm/pgtable.h>
 
 static struct bio *get_swap_bio(gfp_t gfp_flags,
@@ -98,6 +99,12 @@ int swap_writepage(struct page *page, struct writeback_control *wbc)
                unlock_page(page);
                goto out;
        }
+       if (frontswap_put_page(page) == 0) {
+               set_page_writeback(page);
+               unlock_page(page);
+               end_page_writeback(page);
+               goto out;
+       }
        bio = get_swap_bio(GFP_NOIO, page, end_swap_bio_write);
        if (bio == NULL) {
                set_page_dirty(page);
@@ -122,6 +129,11 @@ int swap_readpage(struct page *page)
 
        VM_BUG_ON(!PageLocked(page));
        VM_BUG_ON(PageUptodate(page));
+       if (frontswap_get_page(page) == 0) {
+               SetPageUptodate(page);
+               unlock_page(page);
+               goto out;
+       }
        bio = get_swap_bio(GFP_KERNEL, page, end_swap_bio_read);
        if (bio == NULL) {
                unlock_page(page);