+ mutex_unlock(&sbi->s_alloc_mutex);
+}
+
+u64 lvid_get_unique_id(struct super_block *sb)
+{
+ struct buffer_head *bh;
+ struct udf_sb_info *sbi = UDF_SB(sb);
+ struct logicalVolIntegrityDesc *lvid;
+ struct logicalVolHeaderDesc *lvhd;
+ u64 uniqueID;
+ u64 ret;
+
+ bh = sbi->s_lvid_bh;
+ if (!bh)
+ return 0;
+
+ lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
+ lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
+
+ mutex_lock(&sbi->s_alloc_mutex);
+ ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
+ if (!(++uniqueID & 0xFFFFFFFF))
+ uniqueID += 16;
+ lvhd->uniqueID = cpu_to_le64(uniqueID);
+ mutex_unlock(&sbi->s_alloc_mutex);
+ mark_buffer_dirty(bh);
+
+ return ret;