udf: create common function for tag checksumming

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Acked-by: Jan Kara <jack@suse.cz>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 14 deletions

diff --git a/fs/udf/super.c b/fs/udf/super.c
index 7f75a949e152..12fb91d23a83 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -1564,7 +1564,6 @@ static void udf_open_lvid(struct super_block *sb)
         struct udf_sb_info *sbi = UDF_SB(sb);
         struct buffer_head *bh = sbi->s_lvid_bh;
         if (bh) {
-                int i;
                 kernel_timestamp cpu_time;
                 struct logicalVolIntegrityDesc *lvid =
                                 (struct logicalVolIntegrityDesc *)bh->b_data;
@@ -1582,12 +1581,7 @@ static void udf_open_lvid(struct super_block *sb)
                                 le16_to_cpu(lvid->descTag.descCRCLength),
                                 0));
 
-                lvid->descTag.tagChecksum = 0;
-                for (i = 0; i < 16; i++)
-                        if (i != 4)
-                                lvid->descTag.tagChecksum +=
-                                        ((uint8_t *) &(lvid->descTag))[i];
-
+                lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
                 mark_buffer_dirty(bh);
         }
 }
@@ -1595,7 +1589,6 @@ static void udf_open_lvid(struct super_block *sb)
 static void udf_close_lvid(struct super_block *sb)
 {
         kernel_timestamp cpu_time;
-        int i;
         struct udf_sb_info *sbi = UDF_SB(sb);
         struct buffer_head *bh = sbi->s_lvid_bh;
         struct logicalVolIntegrityDesc *lvid;
@@ -1626,12 +1619,7 @@ static void udf_close_lvid(struct super_block *sb)
                                 le16_to_cpu(lvid->descTag.descCRCLength),
                                 0));
 
-                lvid->descTag.tagChecksum = 0;
-                for (i = 0; i < 16; i++)
-                        if (i != 4)
-                                lvid->descTag.tagChecksum +=
-                                        ((uint8_t *)&(lvid->descTag))[i];
-
+                lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
                 mark_buffer_dirty(bh);
         }
 }