• Heinz Mauelshagen's avatar
    dm raid: introduce extended superblock and new raid types to support takeover/reshaping · 33e53f06
    Heinz Mauelshagen authored
    
    
    Add new members to the dm-raid superblock and new raid types to support
    takeover/reshape.
    
    Add all necessary members needed to support takeover and reshape in one
    go -- aiming to limit the amount of changes to the superblock layout.
    
    This is a larger patch due to the new superblock members, their related
    flags, validation of both and involved API additions/changes:
    
     - add additional members to keep track of:
       - state about forward/backward reshaping
       - reshape position
       - new level, layout, stripe size and delta disks
       - data offset to current and new data for out-of-place reshapes
       - failed devices bitfield extensions to keep track of max raid devices
    
     - adjust super_validate() to cope with new superblock members
    
     - adjust super_init_validation() to cope with new superblock members
    
     - add definitions for ctr flags supporting delta disks etc.
    
     - add new raid types (raid6_n_6 etc.)
    
     - add new raid10 supporting function API (_is_raid10_*())
    
     - adjust to changed raid10 supporting function API
    Signed-off-by: default avatarHeinz Mauelshagen <heinzm@redhat.com>
    Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
    33e53f06