From 6b7a187bef15e1f32df7820f2c54e20033c44574 Mon Sep 17 00:00:00 2001
From: Nick Piggin <npiggin@suse.de>
Date: Tue, 17 Jul 2007 04:03:34 -0700
Subject: [PATCH] --- yaml --- r: 60753 b: refs/heads/master c:
 787d2214c19bcc9b6ac48af0ce098277a801eded h: refs/heads/master i:   60751:
 29e68c0700571de3f859527eb2145497402ffb87 v: v3

---
 [refs]                    |  2 +-
 trunk/fs/buffer.c         | 54 +++++++++++++++++++++++++++------------
 trunk/mm/page-writeback.c |  1 +
 trunk/mm/truncate.c       |  2 +-
 4 files changed, 40 insertions(+), 19 deletions(-)

diff --git a/[refs] b/[refs]
index 87b7e4947d7a..ec24c90f3df4 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: a1ed3dda0ad181532f1e0f0d548067fb9fdddac4
+refs/heads/master: 787d2214c19bcc9b6ac48af0ce098277a801eded
diff --git a/trunk/fs/buffer.c b/trunk/fs/buffer.c
index d654a3b6209e..0f9006714230 100644
--- a/trunk/fs/buffer.c
+++ b/trunk/fs/buffer.c
@@ -675,6 +675,39 @@ void mark_buffer_dirty_inode(struct buffer_head *bh, struct inode *inode)
 }
 EXPORT_SYMBOL(mark_buffer_dirty_inode);
 
+/*
+ * Mark the page dirty, and set it dirty in the radix tree, and mark the inode
+ * dirty.
+ *
+ * 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,
+		struct address_space *mapping, int warn)
+{
+	if (unlikely(!mapping))
+		return !TestSetPageDirty(page);
+
+	if (TestSetPageDirty(page))
+		return 0;
+
+	write_lock_irq(&mapping->tree_lock);
+	if (page->mapping) {	/* Race with truncate? */
+		WARN_ON_ONCE(warn && !PageUptodate(page));
+
+		if (mapping_cap_account_dirty(mapping)) {
+			__inc_zone_page_state(page, NR_FILE_DIRTY);
+			task_io_account_write(PAGE_CACHE_SIZE);
+		}
+		radix_tree_tag_set(&mapping->page_tree,
+				page_index(page), PAGECACHE_TAG_DIRTY);
+	}
+	write_unlock_irq(&mapping->tree_lock);
+	__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
+
+	return 1;
+}
+
 /*
  * Add a page to the dirty page list.
  *
@@ -702,7 +735,7 @@ EXPORT_SYMBOL(mark_buffer_dirty_inode);
  */
 int __set_page_dirty_buffers(struct page *page)
 {
-	struct address_space * const mapping = page_mapping(page);
+	struct address_space *mapping = page_mapping(page);
 
 	if (unlikely(!mapping))
 		return !TestSetPageDirty(page);
@@ -719,21 +752,7 @@ int __set_page_dirty_buffers(struct page *page)
 	}
 	spin_unlock(&mapping->private_lock);
 
-	if (TestSetPageDirty(page))
-		return 0;
-
-	write_lock_irq(&mapping->tree_lock);
-	if (page->mapping) {	/* Race with truncate? */
-		if (mapping_cap_account_dirty(mapping)) {
-			__inc_zone_page_state(page, NR_FILE_DIRTY);
-			task_io_account_write(PAGE_CACHE_SIZE);
-		}
-		radix_tree_tag_set(&mapping->page_tree,
-				page_index(page), PAGECACHE_TAG_DIRTY);
-	}
-	write_unlock_irq(&mapping->tree_lock);
-	__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
-	return 1;
+	return __set_page_dirty(page, mapping, 1);
 }
 EXPORT_SYMBOL(__set_page_dirty_buffers);
 
@@ -1132,8 +1151,9 @@ __getblk_slow(struct block_device *bdev, sector_t block, int size)
  */
 void fastcall mark_buffer_dirty(struct buffer_head *bh)
 {
+	WARN_ON_ONCE(!buffer_uptodate(bh));
 	if (!buffer_dirty(bh) && !test_set_buffer_dirty(bh))
-		__set_page_dirty_nobuffers(bh->b_page);
+		__set_page_dirty(bh->b_page, page_mapping(bh->b_page), 0);
 }
 
 /*
diff --git a/trunk/mm/page-writeback.c b/trunk/mm/page-writeback.c
index ea9da3bed3e9..886ea0d5a136 100644
--- a/trunk/mm/page-writeback.c
+++ b/trunk/mm/page-writeback.c
@@ -824,6 +824,7 @@ int __set_page_dirty_nobuffers(struct page *page)
 		mapping2 = page_mapping(page);
 		if (mapping2) { /* Race with truncate? */
 			BUG_ON(mapping2 != mapping);
+			WARN_ON_ONCE(!PagePrivate(page) && !PageUptodate(page));
 			if (mapping_cap_account_dirty(mapping)) {
 				__inc_zone_page_state(page, NR_FILE_DIRTY);
 				task_io_account_write(PAGE_CACHE_SIZE);
diff --git a/trunk/mm/truncate.c b/trunk/mm/truncate.c
index 7c994f2d6145..f47e46d1be3b 100644
--- a/trunk/mm/truncate.c
+++ b/trunk/mm/truncate.c
@@ -100,9 +100,9 @@ truncate_complete_page(struct address_space *mapping, struct page *page)
 	if (PagePrivate(page))
 		do_invalidatepage(page, 0);
 
+	remove_from_page_cache(page);
 	ClearPageUptodate(page);
 	ClearPageMappedToDisk(page);
-	remove_from_page_cache(page);
 	page_cache_release(page);	/* pagecache ref */
 }