linux-kernel - [094/156] nilfs2: fix hang-up of cleaner after log writer returned with error

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Message-Id: <20100330224822.839646817@linux.site>
Date:	Tue, 30 Mar 2010 15:42:08 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [094/156] nilfs2: fix hang-up of cleaner after log writer returned with error

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

------------------

From: Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>

commit 110d735a0ae69bdd11af9acb6ea3b979137eb118 upstream.

According to the report from Andreas Beckmann (Message-ID:
<4BA54677.3090902@...ckmann.de>), nilfs in 2.6.33 kernel got stuck
after a disk full error.

This turned out to be a regression by log writer updates merged at
kernel 2.6.33.  nilfs_segctor_abort_construction, which is a cleanup
function for erroneous cases, was skipping writeback completion for
some logs.

This fixes the bug and would resolve the hang issue.

Reported-by: Andreas Beckmann <debian@...ckmann.de>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>
Tested-by: Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

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

--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -1902,8 +1902,7 @@ static void nilfs_segctor_abort_construc
 
 	list_splice_tail_init(&sci->sc_write_logs, &logs);
 	ret = nilfs_wait_on_logs(&logs);
-	if (ret)
-		nilfs_abort_logs(&logs, NULL, sci->sc_super_root, ret);
+	nilfs_abort_logs(&logs, NULL, sci->sc_super_root, ret ? : err);
 
 	list_splice_tail_init(&sci->sc_segbufs, &logs);
 	nilfs_cancel_segusage(&logs, nilfs->ns_sufile);


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