udf: use get_bh()

Make UDF use get_bh() instead of directly accessing b_count and use
brelse() instead of udf_release_data() which does just brelse()...

Signed-off-by: Jan Kara <jack@suse.cz>
Acked-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/udf/truncate.c b/fs/udf/truncate.c
index 8419180..0449b22 100644
--- a/fs/udf/truncate.c
+++ b/fs/udf/truncate.c
@@ -119,7 +119,7 @@
 	}
 	UDF_I_LENEXTENTS(inode) = lbcount;
 
-	udf_release_data(epos.bh);
+	brelse(epos.bh);
 }
 
 void udf_truncate_extents(struct inode * inode)
@@ -287,5 +287,5 @@
 	}
 	UDF_I_LENEXTENTS(inode) = inode->i_size;
 
-	udf_release_data(epos.bh);
+	brelse(epos.bh);
 }