linux-kernel - [PATCH 2/2] VM: invalidate_inode_pages2_range() shouldn't fail on page dirty...

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Message-Id: <20070213074338.24191.28711.stgit@heimdal.trondhjem.org>
Date:	Mon, 12 Feb 2007 23:43:38 -0800
From:	Trond Myklebust <Trond.Myklebust@...app.com>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] VM: invalidate_inode_pages2_range() shouldn't fail on page dirty...

From: Trond Myklebust <Trond.Myklebust@...app.com>

invalidate_inode_pages2() should not try to fix races between direct_IO and
mmap(). It should only be trying to clear out pages that were dirty before
the direct_IO write (see generic_file_direct_IO()).
Skipping dirty pages should therefore not result in an error.

Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com>
---

 mm/truncate.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/mm/truncate.c b/mm/truncate.c
index 0f4b6d1..c3ff820 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -318,6 +318,8 @@ EXPORT_SYMBOL(invalidate_mapping_pages);
  * invalidation guarantees, and cannot afford to leave pages behind because
  * shrink_list() has a temp ref on them, or because they're transiently sitting
  * in the lru_cache_add() pagevecs.
+ * Note: this function just skips pages that are dirty without flagging
+ * an error.
  */
 static int
 invalidate_complete_page2(struct address_space *mapping, struct page *page)
@@ -330,7 +332,7 @@ invalidate_complete_page2(struct address
 
 	write_lock_irq(&mapping->tree_lock);
 	if (PageDirty(page))
-		goto failed;
+		goto dirty;
 
 	BUG_ON(PagePrivate(page));
 	__remove_from_page_cache(page);
@@ -338,9 +340,9 @@ invalidate_complete_page2(struct address
 	ClearPageUptodate(page);
 	page_cache_release(page);	/* pagecache ref */
 	return 1;
-failed:
+dirty:
 	write_unlock_irq(&mapping->tree_lock);
-	return 0;
+	return 1;
 }
 
 static int do_launder_page(struct address_space *mapping, struct page *page)
-
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