diff options
Diffstat (limited to 'fs/udf/super.c')
| -rw-r--r-- | fs/udf/super.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/fs/udf/super.c b/fs/udf/super.c index f99ff5dbd741..948e1aca0f34 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; |