[PATCH 1/2] ext4: fix journal ref count in move_extent_par_page

[Peng Tao <bergwolf@gmail.com>]

move_extent_par_page calls a_ops->write_begin() to increase journal handler's
reference count. However, if either mext_replace_branches() or ext4_get_block
fails, the increased reference count isn't decreased. This will cause later
umounting of the fs forever hangs. The patch addresses the issue by calling
ext4_journal_stop() if page is not NULL (which means a_ops->write_end() isn't
invoked).

Signed-off-by: Peng Tao <bergwolf@gmail.com>
---
 fs/ext4/move_extent.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
index bbf2dd9..5821e0b 100644
--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -871,6 +871,7 @@ out:
 		if (PageLocked(page))
 			unlock_page(page);
 		page_cache_release(page);
+		ext4_journal_stop(handle);
 	}
 out2:
 	ext4_journal_stop(handle);
-- 
1.6.2.GIT