• Chris Mason's avatar
    Btrfs: Add inode sequence number for NFS and reserved space in a few structs · c3027eb5
    Chris Mason authored
    
    
    This adds a sequence number to the btrfs inode that is increased on
    every update.  NFS will be able to use that to detect when an inode has
    changed, without relying on inaccurate time fields.
    
    While we're here, this also:
    
    Puts reserved space into the super block and inode
    
    Adds a log root transid to the super so we can pick the newest super
    based on the fsync log as well as the main transaction ID.  For now
    the log root transid is always zero, but that'll get fixed.
    
    Adds a starting offset to the dev_item.  This will let us do better
    alignment calculations if we know the start of a partition on the disk.
    Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
    c3027eb5