[GFS2] Clean up journaled data writing

This patch cleans up the code for writing journaled data into the log.
It also removes the need to allocate a small "tag" structure for each
block written into the log. Instead we just keep count of the outstanding
I/O so that we can be sure that its all been written at the correct time.
Another result of this patch is that a number of ll_rw_block() calls
have become submit_bh() calls, closing some races at the same time.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 2 insertions, 7 deletions

diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 8aa5780862be..eaddfb5a8e6f 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -341,12 +341,6 @@ struct gfs2_quota_data {
         unsigned long qd_last_touched;
 };
 
-struct gfs2_log_buf {
-        struct list_head lb_list;
-        struct buffer_head *lb_bh;
-        struct buffer_head *lb_real;
-};
-
 struct gfs2_trans {
         unsigned long tr_ip;
 
@@ -631,7 +625,8 @@ struct gfs2_sbd {
 
         unsigned long sd_log_flush_time;
         struct rw_semaphore sd_log_flush_lock;
-        struct list_head sd_log_flush_list;
+        atomic_t sd_log_in_flight;
+        wait_queue_head_t sd_log_flush_wait;
 
         unsigned int sd_log_flush_head;
         u64 sd_log_flush_wrapped;