Merge to Fedora kernel-2.6.18-1.2224_FC5 patched with stable patch-2.6.18.1-vs2.0...

[linux-2.6.git] / mm / page_io.c

diff --git a/mm/page_io.c b/mm/page_io.c
index bb2b0d5..a0ea98f 100644 (file)
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -59,7 +59,7 @@ static int end_swap_bio_write(struct bio *bio, unsigned int bytes_done, int err)
        return 0;
 }
 
-static int end_swap_bio_read(struct bio *bio, unsigned int bytes_done, int err)
+int end_swap_bio_read(struct bio *bio, unsigned int bytes_done, int err)
 {
        const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
        struct page *page = bio->bi_io_vec[0].bv_page;
@@ -101,7 +101,7 @@ int swap_writepage(struct page *page, struct writeback_control *wbc)
        }
        if (wbc->sync_mode == WB_SYNC_ALL)
                rw |= (1 << BIO_RW_SYNC);
-       inc_page_state(pswpout);
+       count_vm_event(PSWPOUT);
        set_page_writeback(page);
        unlock_page(page);
        submit_bio(rw, bio);
@@ -123,7 +123,7 @@ int swap_readpage(struct file *file, struct page *page)
                ret = -ENOMEM;
                goto out;
        }
-       inc_page_state(pswpin);
+       count_vm_event(PSWPIN);
        submit_bio(READ, bio);
 out:
        return ret;
@@ -137,10 +137,12 @@ out:
  * We use end_swap_bio_read() even for writes, because it happens to do what
  * we want.
  */
-int rw_swap_page_sync(int rw, swp_entry_t entry, struct page *page)
+int rw_swap_page_sync(int rw, swp_entry_t entry, struct page *page,
+                       struct bio **bio_chain)
 {
        struct bio *bio;
        int ret = 0;
+       int bio_rw;
 
        lock_page(page);
 
@@ -151,11 +153,22 @@ int rw_swap_page_sync(int rw, swp_entry_t entry, struct page *page)
                goto out;
        }
 
-       submit_bio(rw | (1 << BIO_RW_SYNC), bio);
-       wait_on_page_locked(page);
-
-       if (!PageUptodate(page) || PageError(page))
-               ret = -EIO;
+       bio_rw = rw;
+       if (!bio_chain)
+               bio_rw |= (1 << BIO_RW_SYNC);
+       if (bio_chain)
+               bio_get(bio);
+       submit_bio(bio_rw, bio);
+       if (bio_chain == NULL) {
+               wait_on_page_locked(page);
+
+               if (!PageUptodate(page) || PageError(page))
+                       ret = -EIO;
+       }
+       if (bio_chain) {
+               bio->bi_private = *bio_chain;
+               *bio_chain = bio;
+       }
 out:
        return ret;
 }