udf: Fix handling of multisession media

According to OSTA UDF specification, only anchor blocks and primary volume
descriptors are placed on media relative to the last session. All other block
numbers are absolute (in the partition or the whole media). This seems to be
confirmed by multisession media created by other systems.

Signed-off-by: Sebastian Manciulea <manciuleas@yahoo.com>
Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 5 insertions, 8 deletions

diff --git a/fs/udf/misc.c b/fs/udf/misc.c
index 581b6e4cc591..96996204d928 100644
--- a/fs/udf/misc.c
+++ b/fs/udf/misc.c
@@ -203,16 +203,15 @@ struct buffer_head *udf_read_tagged(struct super_block *sb, uint32_t block,
 {
         tag *tag_p;
         struct buffer_head *bh = NULL;
-        struct udf_sb_info *sbi = UDF_SB(sb);
 
         /* Read the block */
         if (block == 0xFFFFFFFF)
                 return NULL;
 
-        bh = udf_tread(sb, block + sbi->s_session);
+        bh = udf_tread(sb, block);
         if (!bh) {
                 udf_debug("block=%d, location=%d: read failed\n",
-                          block + sbi->s_session, location);
+                          block, location);
                 return NULL;
         }
 
@@ -222,8 +221,7 @@ struct buffer_head *udf_read_tagged(struct super_block *sb, uint32_t block,
 
         if (location != le32_to_cpu(tag_p->tagLocation)) {
                 udf_debug("location mismatch block %u, tag %u != %u\n",
-                          block + sbi->s_session,
-                          le32_to_cpu(tag_p->tagLocation), location);
+                          block, le32_to_cpu(tag_p->tagLocation), location);
                 goto error_out;
         }
 
@@ -247,9 +245,8 @@ struct buffer_head *udf_read_tagged(struct super_block *sb, uint32_t block,
                                         le16_to_cpu(tag_p->descCRCLength), 0))
                 return bh;
 
-        udf_debug("Crc failure block %d: crc = %d, crclen = %d\n",
-                  block + sbi->s_session, le16_to_cpu(tag_p->descCRC),
-                  le16_to_cpu(tag_p->descCRCLength));
+        udf_debug("Crc failure block %d: crc = %d, crclen = %d\n", block,
+            le16_to_cpu(tag_p->descCRC), le16_to_cpu(tag_p->descCRCLength));
 
 error_out:
         brelse(bh);