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, 1 insertions, 8 deletions

diff --git a/fs/udf/namei.c b/fs/udf/namei.c
index a126950d79e6..9b5cfc5f725c 100644
--- a/fs/udf/namei.c
+++ b/fs/udf/namei.c
@@ -47,8 +47,6 @@ int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
 {
         uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(tag);
         uint16_t crc;
-        uint8_t checksum = 0;
-        int i;
         int offset;
         uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
         uint8_t lfi = cfi->lengthFileIdent;
@@ -122,13 +120,8 @@ int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
 
         cfi->descTag.descCRC = cpu_to_le16(crc);
         cfi->descTag.descCRCLength = cpu_to_le16(crclen);
+        cfi->descTag.tagChecksum = udf_tag_checksum(&cfi->descTag);
 
-        for (i = 0; i < 16; i++) {
-                if (i != 4)
-                        checksum += ((uint8_t *)&cfi->descTag)[i];
-        }
-
-        cfi->descTag.tagChecksum = checksum;
         if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset)) {
                 memcpy((uint8_t *)sfi, (uint8_t *)cfi,
                         sizeof(struct fileIdentDesc));