[RESEND PATCH] fs/buffer.c: exit if already confirmed page has dirtyand writeback buffers

[Gu Zheng]

Stop the loop of iterating bh if we have confirmed page
has dirty and writeback buffers.

Signed-off-by: Gu Zheng <guz.fnst@xxxxxxxxxxxxxx>
---
 fs/buffer.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/buffer.c b/fs/buffer.c
index 6024877..519cc5c 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -112,7 +112,7 @@ void buffer_check_dirty_writeback(struct page *page,
 			*dirty = true;
 
 		bh = bh->b_this_page;
-	} while (bh != head);
+	} while ((bh != head) && !(*writeback && *dirty));
 }
 EXPORT_SYMBOL(buffer_check_dirty_writeback);
 
-- 
1.7.7

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