[PATCH] mm: swap write failure fixup

[pandora-kernel.git] / mm / page_io.c

diff --git a/mm/page_io.c b/mm/page_io.c
index bb2b0d5..d2f0a57 100644 (file)
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -52,8 +52,23 @@ static int end_swap_bio_write(struct bio *bio, unsigned int bytes_done, int err)
        if (bio->bi_size)
                return 1;
 
-       if (!uptodate)
+       if (!uptodate) {
                SetPageError(page);
+               /*
+                * We failed to write the page out to swap-space.
+                * Re-dirty the page in order to avoid it being reclaimed.
+                * Also print a dire warning that things will go BAD (tm)
+                * very quickly.
+                *
+                * Also clear PG_reclaim to avoid rotate_reclaimable_page()
+                */
+               set_page_dirty(page);
+               printk(KERN_ALERT "Write-error on swap-device (%u:%u:%Lu)\n",
+                               imajor(bio->bi_bdev->bd_inode),
+                               iminor(bio->bi_bdev->bd_inode),
+                               (unsigned long long)bio->bi_sector);
+               ClearPageReclaim(page);
+       }
        end_page_writeback(page);
        bio_put(bio);
        return 0;
@@ -70,6 +85,10 @@ static int end_swap_bio_read(struct bio *bio, unsigned int bytes_done, int err)
        if (!uptodate) {
                SetPageError(page);
                ClearPageUptodate(page);
+               printk(KERN_ALERT "Read-error on swap-device (%u:%u:%Lu)\n",
+                               imajor(bio->bi_bdev->bd_inode),
+                               iminor(bio->bi_bdev->bd_inode),
+                               (unsigned long long)bio->bi_sector);
        } else {
                SetPageUptodate(page);
        }
@@ -101,7 +120,7 @@ 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 +142,7 @@ 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;