• Ilya Dryomov's avatar
    Btrfs: add BTRFS_AVAIL_ALLOC_BIT_SINGLE bit · a46d11a8
    Ilya Dryomov authored
    Right now on-disk BTRFS_BLOCK_GROUP_* profile bits are used for
    avail_{data,metadata,system}_alloc_bits fields, which gather info about
    available allocation profiles in the FS.  When chunk is created or read
    from disk, its profile is OR'ed with the corresponding avail_alloc_bits
    field.  Since SINGLE is denoted by 0 in the on-disk format, currently
    there is no way to tell when such chunks become avaialble.  Restriper
    needs that information, so add a separate bit for SINGLE profile.
    
    This bit is going to be in-memory only, it should never be written out
    to disk, so it's not a disk format change.  However to avoid remappings
    in future, reserve corresponding on-disk bit.
    Signed-off-by: default avatarIlya Dryomov <idryomov@gmail.com>
    a46d11a8
ctree.h 91.5 KB