Re: [PATCH 4/7] Use vfs __set_page_dirty interface instead of doing it inside filesystem

From: Sha Zhengju <redacted>

Following we will treat SetPageDirty and dirty page accounting as an integrated
operation. Filesystems had better use vfs interface directly to avoid those details.

Signed-off-by: Sha Zhengju <redacted>
---
 fs/buffer.c                 |    2 +-
 fs/ceph/addr.c              |   20 ++------------------
 include/linux/buffer_head.h |    2 ++
 3 files changed, 5 insertions(+), 19 deletions(-)

diff --git a/fs/buffer.c b/fs/buffer.c
index e8d96b8..55522dd 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c

@@ -610,7 +610,7 @@ EXPORT_SYMBOL(mark_buffer_dirty_inode);
  * If warn is true, then emit a warning if the page is not uptodate and has
  * not been truncated.
  */
-static int __set_page_dirty(struct page *page,
+int __set_page_dirty(struct page *page,
 		struct address_space *mapping, int warn)
 {
 	if (unlikely(!mapping))

diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index 8b67304..d028fbe 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c

@@ -5,6 +5,7 @@
 #include <linux/mm.h>
 #include <linux/pagemap.h>
 #include <linux/writeback.h>	/* generic_writepages */
+#include <linux/buffer_head.h>
 #include <linux/slab.h>
 #include <linux/pagevec.h>
 #include <linux/task_io_accounting_ops.h>

@@ -73,14 +74,8 @@ static int ceph_set_page_dirty(struct page *page)
 	int undo = 0;
 	struct ceph_snap_context *snapc;
 
-	if (unlikely(!mapping))
-		return !TestSetPageDirty(page);
-
-	if (TestSetPageDirty(page)) {
-		dout("%p set_page_dirty %p idx %lu -- already dirty\n",
-		     mapping->host, page, page->index);

+	if (!__set_page_dirty(page, mapping, 1))
 		return 0;
-	}
 
 	inode = mapping->host;
 	ci = ceph_inode(inode);