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authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-11-29 10:51:16 +0300
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-11-30 15:06:35 +0300
commite29df395bc6d2d0c89b3d8a5939a24b1b43c2fb6 (patch)
tree6d6f570d8158d7a18570492d9f5f5edf843ed28c /fs/nilfs2/segbuf.c
parent9c965bac169f786cc6cca8ff81d3b636e923c960 (diff)
downloadlinux-e29df395bc6d2d0c89b3d8a5939a24b1b43c2fb6.tar.xz
nilfs2: add iterator for segment buffers
This adds a few iterator functions for segment buffers to make it easy to handle multiple series of logs. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Diffstat (limited to 'fs/nilfs2/segbuf.c')
-rw-r--r--fs/nilfs2/segbuf.c45
1 files changed, 44 insertions, 1 deletions
diff --git a/fs/nilfs2/segbuf.c b/fs/nilfs2/segbuf.c
index 636590c92c8b..d856d62bf886 100644
--- 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
*/