[PATCH 04/10] fs/buffer.c: use attach/detach_page_private

[Guoqing Jiang]

Since the new pair function is introduced, we can call them to clean the
code in buffer.c.

Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Guoqing Jiang <guoqing.jiang@xxxxxxxxxxxxxxx>
---
No change since RFC V3.

RFC V2 -> RFC V3
1. rename clear_page_private to detach_page_private.

RFC -> RFC V2
1. change the name of new functions to attach/clear_page_private.

 fs/buffer.c | 16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)

diff --git a/fs/buffer.c b/fs/buffer.c
index 85b4be1939ce..fc8831c392d7 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -123,14 +123,6 @@ void __wait_on_buffer(struct buffer_head * bh)
 }
 EXPORT_SYMBOL(__wait_on_buffer);
 
-static void
-__clear_page_buffers(struct page *page)
-{
-	ClearPagePrivate(page);
-	set_page_private(page, 0);
-	put_page(page);
-}
-
 static void buffer_io_error(struct buffer_head *bh, char *msg)
 {
 	if (!test_bit(BH_Quiet, &bh->b_state))
@@ -906,7 +898,7 @@ link_dev_buffers(struct page *page, struct buffer_head *head)
 		bh = bh->b_this_page;
 	} while (bh);
 	tail->b_this_page = head;
-	attach_page_buffers(page, head);
+	attach_page_private(page, head);
 }
 
 static sector_t blkdev_max_block(struct block_device *bdev, unsigned int size)
@@ -1624,7 +1616,7 @@ void create_empty_buffers(struct page *page,
 			bh = bh->b_this_page;
 		} while (bh != head);
 	}
-	attach_page_buffers(page, head);
+	attach_page_private(page, head);
 	spin_unlock(&page->mapping->private_lock);
 }
 EXPORT_SYMBOL(create_empty_buffers);
@@ -2611,7 +2603,7 @@ static void attach_nobh_buffers(struct page *page, struct buffer_head *head)
 			bh->b_this_page = head;
 		bh = bh->b_this_page;
 	} while (bh != head);
-	attach_page_buffers(page, head);
+	attach_page_private(page, head);
 	spin_unlock(&page->mapping->private_lock);
 }
 
@@ -3276,7 +3268,7 @@ drop_buffers(struct page *page, struct buffer_head **buffers_to_free)
 		bh = next;
 	} while (bh != head);
 	*buffers_to_free = head;
-	__clear_page_buffers(page);
+	detach_page_private(page);
 	return 1;
 failed:
 	return 0;
-- 
2.17.1