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-rw-r--r--fs/udf/super.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/fs/udf/super.c b/fs/udf/super.c
index f99ff5dbd74..948e1aca0f3 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -1823,6 +1823,33 @@ static void udf_close_lvid(struct super_block *sb)
sbi->s_lvid_dirty = 0;
}
+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;
+}
+
static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
{
int i;