linux-ext4 - [patch -next] ext4: locking issue on error path

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Message-ID: <20120717063106.GA14985@elgon.mountain>
Date:	Tue, 17 Jul 2012 09:31:06 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	"Theodore Ts'o" <tytso@....edu>, Zheng Liu <wenqing.lz@...bao.com>
Cc:	Andreas Dilger <adilger.kernel@...ger.ca>,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch -next] ext4: locking issue on error path

We recently changed how the locking worked here, but this error path was
missed.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 8c84070..2728fb7 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3031,8 +3031,10 @@ static ssize_t ext4_ext_direct_IO(int rw, struct kiocb *iocb,
 		if (!is_sync_kiocb(iocb)) {
 			ext4_io_end_t *io_end =
 				ext4_init_io_end(inode, GFP_NOFS);
-			if (!io_end)
-				return -ENOMEM;
+			if (!io_end) {
+				ret = -ENOMEM;
+				goto retake_lock;
+			}
 			io_end->flag |= EXT4_IO_END_DIRECT;
 			iocb->private = io_end;
 			/*
@@ -3094,6 +3096,7 @@ static ssize_t ext4_ext_direct_IO(int rw, struct kiocb *iocb,
 			ext4_clear_inode_state(inode, EXT4_STATE_DIO_UNWRITTEN);
 		}
 
+retake_lock:
 		/* take i_mutex locking again if we do a ovewrite dio */
 		if (overwrite) {
 			up_read(&EXT4_I(inode)->i_data_sem);
--
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