[PATCH] md/bitmap: remove bitmap writeback daemon

md/bitmap currently has a separate thread to wait for writes to the bitmap
file to complete (as we cannot get a callback on that action).

However this isn't needed as bitmap_unplug is called from process context and
waits for the writeback thread to do it's work.  The same result can be
achieved by doing the waiting directly in bitmap_unplug.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 0 insertions, 6 deletions

diff --git a/include/linux/raid/bitmap.h b/include/linux/raid/bitmap.h
index 899437802aea..9c8907ca60a7 100644
--- a/include/linux/raid/bitmap.h
+++ b/include/linux/raid/bitmap.h
@@ -244,13 +244,7 @@ struct bitmap {
 	unsigned long daemon_lastrun; /* jiffies of last run */
 	unsigned long daemon_sleep; /* how many seconds between updates? */
 
-	/*
-	 * bitmap_writeback_daemon waits for file-pages that have been written,
-	 * as there is no way to get a call-back when a page write completes.
-	 */
-	mdk_thread_t *writeback_daemon;
 	spinlock_t write_lock;
-	wait_queue_head_t write_wait;
 	struct list_head complete_pages;
 	mempool_t *write_pool;
 };