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From:   Vasily Averin <vvs@virtuozzo.com>
Subject: [PATCH v2 08/11] ext4: lost brelse in ext4_orphan_add()
To:     linux-ext4@vger.kernel.org, Theodore Ts'o <tytso@mit.edu>
Cc:     Andreas Dilger <adilger.kernel@dilger.ca>,
        linux-kernel@vger.kernel.org, Dmitry Monakhov <dmonakhov@gmail.com>
References: <cover.1540935522.git.vvs@virtuozzo.com>
Message-ID: <c747413b-f5e1-d3e0-650b-e3749a98d59d@virtuozzo.com>
Date:   Wed, 31 Oct 2018 00:58:31 +0300
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iloc.bh os taken in ext4_reserve_inode_write().
If (dirty == true) it is released in ext4_mark_iloc_dirty(),
however it is not released in (dirty == false) case.

Fixes d745a8c20c1f ("ext4: reduce contention on s_orphan_lock")
however iloc.bh count balance was broken earlier by
Fixes 6e3617e579e0 ("ext4: Handle non empty on-disk orphan link") #2.6.34

cc: Dmitry Monakhov <dmonakhov@gmail.com>
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
---
 fs/ext4/namei.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 67a38532032a..d388cce72db2 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2811,7 +2811,9 @@ int ext4_orphan_add(handle_t *handle, struct inode *inode)
 			list_del_init(&EXT4_I(inode)->i_orphan);
 			mutex_unlock(&sbi->s_orphan_lock);
 		}
-	}
+	} else
+		brelse(iloc.bh);
+
 	jbd_debug(4, "superblock will point to %lu\n", inode->i_ino);
 	jbd_debug(4, "orphan inode %lu will point to %d\n",
 			inode->i_ino, NEXT_ORPHAN(inode));
-- 
2.17.1