nilfs2: add iterator for segment buffers

[net-next-2.6.git] / fs / nilfs2 / segbuf.c

diff --git a/fs/nilfs2/segbuf.c b/fs/nilfs2/segbuf.c
index 636590c92c8bca949a8f09cb46d4534b437fb086..d856d62bf886efff68d48a8463c6503ab8ccbc92 100644 (file)
--- a/fs/nilfs2/segbuf.c
+++ b/fs/nilfs2/segbuf.c
@@ -234,7 +234,7 @@ void nilfs_segbuf_fill_in_data_crc(struct nilfs_segment_buffer *segbuf,
        raw_sum->ss_datasum = cpu_to_le32(crc);
 }
 
-void nilfs_release_buffers(struct list_head *list)
+static void nilfs_release_buffers(struct list_head *list)
 {
        struct buffer_head *bh, *n;
 
@@ -256,6 +256,49 @@ void nilfs_release_buffers(struct list_head *list)
        }
 }
 
+static void nilfs_segbuf_clear(struct nilfs_segment_buffer *segbuf)
+{
+       nilfs_release_buffers(&segbuf->sb_segsum_buffers);
+       nilfs_release_buffers(&segbuf->sb_payload_buffers);
+}
+
+/*
+ * Iterators for segment buffers
+ */
+void nilfs_clear_logs(struct list_head *logs)
+{
+       struct nilfs_segment_buffer *segbuf;
+
+       list_for_each_entry(segbuf, logs, sb_list)
+               nilfs_segbuf_clear(segbuf);
+}
+
+void nilfs_truncate_logs(struct list_head *logs,
+                        struct nilfs_segment_buffer *last)
+{
+       struct nilfs_segment_buffer *n, *segbuf;
+
+       segbuf = list_prepare_entry(last, logs, sb_list);
+       list_for_each_entry_safe_continue(segbuf, n, logs, sb_list) {
+               list_del_init(&segbuf->sb_list);
+               nilfs_segbuf_clear(segbuf);
+               nilfs_segbuf_free(segbuf);
+       }
+}
+
+int nilfs_wait_on_logs(struct list_head *logs)
+{
+       struct nilfs_segment_buffer *segbuf;
+       int err;
+
+       list_for_each_entry(segbuf, logs, sb_list) {
+               err = nilfs_segbuf_wait(segbuf);
+               if (err)
+                       return err;
+       }
+       return 0;
+}
+
 /*
  * BIO operations
  */