linux-kernel - [RESEND] [PATCH] fix invalidate_inode_pages2

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Message-Id: <6.0.0.20.2.20080215132604.06091618@172.19.0.2>
Date:	Fri, 15 Feb 2008 13:36:32 +0900
From:	Hisashi Hifumi <hifumi.hisashi@....ntt.co.jp>
To:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: [RESEND] [PATCH] fix invalidate_inode_pages2_range not to
  clear ret

Hi Andrew.

DIO invalidates page cache through invalidate_inode_pages2_range().
invalidate_inode_pages2_range() sets ret=-EIO when invalidate_complete_page2()
fails, but this ret is cleared if do_launder_page() succeed on a page of next index. 
In this case, dio is carried out even if invalidate_complete_page2() fails on some pages.
This can cause inconsistency between memory and blocks on HDD because the page
cache still exists.

Following patch fixes this issue.

Thanks.

Signed-off-by :Hisashi Hifumi <hifumi.hisashi@....ntt.co.jp>

diff -Nrup linux-2.6.25-rc1.org/mm/truncate.c linux-2.6.25-rc1/mm/truncate.c
--- linux-2.6.25-rc1.org/mm/truncate.c	2008-02-12 13:37:41.000000000 +0900
+++ linux-2.6.25-rc1/mm/truncate.c	2008-02-15 11:24:33.000000000 +0900
@@ -392,6 +392,7 @@ int invalidate_inode_pages2_range(struct
 	pgoff_t next;
 	int i;
 	int ret = 0;
+	int ret2 = 0;
 	int did_range_unmap = 0;
 	int wrapped = 0;
 
@@ -439,9 +440,11 @@ int invalidate_inode_pages2_range(struct
 				}
 			}
 			BUG_ON(page_mapped(page));
-			ret = do_launder_page(mapping, page);
-			if (ret == 0 && !invalidate_complete_page2(mapping, page))
-				ret = -EIO;
+			ret2 = do_launder_page(mapping, page);
+			if (ret2 == 0 && !invalidate_complete_page2(mapping, page))
+				ret2 = -EIO;
+			if (ret2 < 0)
+				ret = ret2;
 			unlock_page(page);
 		}
 		pagevec_release(&pvec);


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