[PATCH 1/4] udf: Add missed protection for s_lvid_dirty

[Alessio Igor Bogani <abogani@texware.it>]

As reported in udf_sb.h the udf_sb_infoi's structure member s_lvid_dirty should
be protected by s_alloc_mutex. Added that mutex on a couple of places where it
miss.

This work was supported by a hardware donation from the CE Linux Forum.

Signed-off-by: Alessio Igor Bogani <abogani@texware.it>
---
 fs/udf/super.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/fs/udf/super.c b/fs/udf/super.c
index 4a5c7c6..c05834e 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -1789,7 +1789,9 @@ static void udf_open_lvid(struct super_block *sb)
 
 	lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
 	mark_buffer_dirty(bh);
+	mutex_lock(&sbi->s_alloc_mutex);
 	sbi->s_lvid_dirty = 0;
+	mutex_unlock(&sbi->s_alloc_mutex);
 }
 
 static void udf_close_lvid(struct super_block *sb)
@@ -1821,7 +1823,9 @@ static void udf_close_lvid(struct super_block *sb)
 
 	lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
 	mark_buffer_dirty(bh);
+	mutex_lock(&sbi->s_alloc_mutex);
 	sbi->s_lvid_dirty = 0;
+	mutex_unlock(&sbi->s_alloc_mutex);
 }
 
 static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
-- 
1.7.0.4