f2fs: check truncation of mapping after lock_page

We call lock_page when we need to update a page after readpage.
Between grab and lock page, the page can be truncated by other thread.
So, we should check the page after lock_page whether it was truncated or not.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 590ea50c80a7..b1de01da1a40 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -65,6 +65,10 @@ repeat:
                 goto repeat;
 
         lock_page(page);
+        if (page->mapping != mapping) {
+                f2fs_put_page(page, 1);
+                goto repeat;
+        }
 out:
         mark_page_accessed(page);
         return page;