linux-kernel - [PATCH 14/15] GFS2: Adding missing unlock

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Message-Id: <1300180305-5993-15-git-send-email-swhiteho@redhat.com>
Date:	Tue, 15 Mar 2011 09:11:44 +0000
From:	Steven Whitehouse <swhiteho@...hat.com>
To:	cluster-devel@...hat.com, linux-kernel@...r.kernel.org
Cc:	Maxim <maxim.patlasov@...il.com>,
	Steven Whitehouse <swhiteho@...hat.com>
Subject: [PATCH 14/15] GFS2: Adding missing unlock_page()

From: Maxim <maxim.patlasov@...il.com>

gfs2_write_begin() calls grab_cache_page_write_begin() that returns *locked*
page. Correspondent error-handling path lacks for unlock_page() call:

> out:
> 	if (error == 0)
> 		return 0;
>
> 	page_cache_release(page);

The whole system hangs if gfs2_unstuff_dinode() called from gfs2_write_begin()
failed for some reason.

Reported-by: Maxim <maxim.patlasov@...il.com>
Signed-off-by: Maxim <maxim.patlasov@...il.com>
Signed-off-by: Steven Whitehouse <swhiteho@...hat.com>

diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
index 4f36f88..aad77e4 100644
--- a/fs/gfs2/aops.c
+++ b/fs/gfs2/aops.c
@@ -695,6 +695,7 @@ out:
 	if (error == 0)
 		return 0;
 
+	unlock_page(page);
 	page_cache_release(page);
 
 	gfs2_trans_end(sdp);
-- 
1.7.4

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