nilfs2: fix missing unlock in error path of nilfs_mdt_write_page

This adds a missing unlock of nilfs->ns_writer_mutex in
nilfs_mdt_write_page() function.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>

diff --git a/fs/nilfs2/mdt.c b/fs/nilfs2/mdt.c
index 3d3ddb3..2dfd477 100644 (file)
--- a/fs/nilfs2/mdt.c
+++ b/fs/nilfs2/mdt.c
@@ -412,8 +412,10 @@ nilfs_mdt_write_page(struct page *page, struct writeback_control *wbc)
                return 0; /* Do not request flush for shadow page cache */
        if (!sb) {
                writer = nilfs_get_writer(NILFS_MDT(inode)->mi_nilfs);
-               if (!writer)
+               if (!writer) {
+                       nilfs_put_writer(NILFS_MDT(inode)->mi_nilfs);
                        return -EROFS;
+               }
                sb = writer->s_super;
        }