f2fs: fix to unlock node page when it was truncated

If the node page was truncated, its block address became zero.
This means that we don't need to write the node page, but have to unlock
NODE_WRITE, decrease the number of dirty node pages, and then unlock_page
before returning the f2fs_write_node_page with zero.

Reviewed-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index e275218904ed964126aaae36598d7f13433f77c3..3dc63f4cf2b1566c5bf0ceb9c7b989bbb547b5f1 100644 (file)
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1106,15 +1106,15 @@ static int f2fs_write_node_page(struct page *page,
 
        /* This page is already truncated */
        if (ni.blk_addr == NULL_ADDR)
-               return 0;
+               goto out;
 
        set_page_writeback(page);
 
        /* insert node offset */
        write_node_page(sbi, page, nid, ni.blk_addr, &new_addr);
        set_node_addr(sbi, &ni, new_addr);
+out:
        dec_page_count(sbi, F2FS_DIRTY_NODES);
-
        mutex_unlock_op(sbi, NODE_WRITE);
        unlock_page(page);
        return 0;