[PATCH 3.11 022/131] ext4: fix error paths in swap_inode_boot_loader()

[Luis Henriques]

3.11.10.6 -stable review patch.  If anyone has any objections, please let me know.

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

From: Zheng Liu <wenqing.lz at taobao.com>

commit 30d29b119ef01776e0a301444ab24defe8d8bef3 upstream.

In swap_inode_boot_loader() we forgot to release ->i_mutex and resume
unlocked dio for inode and inode_bl if there is an error starting the
journal handle.  This commit fixes this issue.

Reported-by: Ahmed Tamrawi <ahmedtamrawi at gmail.com>
Cc: Andreas Dilger <adilger.kernel at dilger.ca>
Cc: Dr. Tilmann Bubeck <t.bubeck at reinform.de>
Signed-off-by: Zheng Liu <wenqing.lz at taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso at mit.edu>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 fs/ext4/ioctl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index c0427e2..42624a9 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -145,7 +145,7 @@ static long swap_inode_boot_loader(struct super_block *sb,
 	handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
 	if (IS_ERR(handle)) {
 		err = -EINVAL;
-		goto swap_boot_out;
+		goto journal_err_out;
 	}
 
 	/* Protect extent tree against block allocations via delalloc */
@@ -203,6 +203,7 @@ static long swap_inode_boot_loader(struct super_block *sb,
 
 	ext4_double_up_write_data_sem(inode, inode_bl);
 
+journal_err_out:
 	ext4_inode_resume_unlocked_dio(inode);
 	ext4_inode_resume_unlocked_dio(inode_bl);
 
-- 
1.9.0