[54/99] nilfs2: fix dirty page accounting leak causing hang at write

From: Greg KH
Date: Fri Nov 06 2009 - 17:32:19 EST

2.6.31-stable review patch. If anyone has any objections, please let us know.

From: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxxxxxx>

commit b1e19e5601277845b4f17ecd7c9ba04f73ee11aa upstream.

Bruno Prémont and Dunphy, Bill noticed me that NILFS will certainly
hang on ARM-based targets.

I found this was caused by an underflow of dirty pages counter. A
b-tree cache routine was marking page dirty without adjusting page
account information.

This fixes the dirty page accounting leak and resolves the hang on
arm-based targets.

Reported-by: Bruno Prémont <bonbons@xxxxxxxxxxxxxxxxx>
Reported-by: Dunphy, Bill <WDunphy@xxxxxxxxxxxxxxxx>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxxxxxx>
Tested-by: Bruno Prémont <bonbons@xxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

fs/nilfs2/btnode.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

--- a/fs/nilfs2/btnode.c
+++ b/fs/nilfs2/btnode.c
@@ -276,8 +276,7 @@ void nilfs_btnode_commit_change_key(stru
"invalid oldkey %lld (newkey=%lld)",
(unsigned long long)oldkey,
(unsigned long long)newkey);
- if (!test_set_buffer_dirty(obh) && TestSetPageDirty(opage))
- BUG();
+ nilfs_btnode_mark_dirty(obh);

radix_tree_delete(&btnc->page_tree, oldkey);

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/