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Subject[PATCH V2 3/6] Use vfs __set_page_dirty interface instead of doing it inside filesystem
Date
From: Sha Zhengju <handai.szj@taobao.com>

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 <handai.szj@taobao.com>
Acked-by: Sage Weil <sage@inktank.com>
---
fs/buffer.c | 3 ++-
fs/ceph/addr.c | 20 ++------------------
include/linux/buffer_head.h | 2 ++
3 files changed, 6 insertions(+), 19 deletions(-)
diff --git a/fs/buffer.c b/fs/buffer.c
index 5e0b0d2..ffcfb87 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))
@@ -631,6 +631,7 @@ static int __set_page_dirty(struct page *page,

return 1;
}
+EXPORT_SYMBOL(__set_page_dirty);

/*
* Add a page to the dirty page list.
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);
@@ -107,14 +102,7 @@ static int ceph_set_page_dirty(struct page *page)
snapc, snapc->seq, snapc->num_snaps);
spin_unlock(&ci->i_ceph_lock);

- /* now adjust page */
- spin_lock_irq(&mapping->tree_lock);
if (page->mapping) { /* Race with truncate? */
- WARN_ON_ONCE(!PageUptodate(page));
- account_page_dirtied(page, page->mapping);
- radix_tree_tag_set(&mapping->page_tree,
- page_index(page), PAGECACHE_TAG_DIRTY);
-
/*
* Reference snap context in page->private. Also set
* PagePrivate so that we get invalidatepage callback.
@@ -126,14 +114,10 @@ static int ceph_set_page_dirty(struct page *page)
undo = 1;
}

- spin_unlock_irq(&mapping->tree_lock);
-
if (undo)
/* whoops, we failed to dirty the page */
ceph_put_wrbuffer_cap_refs(ci, 1, snapc);

- __mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
-
BUG_ON(!PageDirty(page));
return 1;
}
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index 458f497..0a331a8 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -336,6 +336,8 @@ static inline void lock_buffer(struct buffer_head *bh)
}

extern int __set_page_dirty_buffers(struct page *page);
+extern int __set_page_dirty(struct page *page,
+ struct address_space *mapping, int warn);

#else /* CONFIG_BLOCK */

--
1.7.1


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