• Steven Whitehouse's avatar
    GFS2: Merge lock_dlm module into GFS2 · f057f6cd
    Steven Whitehouse authored
    This is the big patch that I've been working on for some time
    now. There are many reasons for wanting to make this change
    such as:
     o Reducing overhead by eliminating duplicated fields between structures
     o Simplifcation of the code (reduces the code size by a fair bit)
     o The locking interface is now the DLM interface itself as proposed
       some time ago.
     o Fewer lookups of glocks when processing replies from the DLM
     o Fewer memory allocations/deallocations for each glock
     o Scope to do further optimisations in the future (but this patch is
       more than big enough for now!)
    Please note that (a) this patch relates to the lock_dlm module and
    not the DLM itself, that is still a separate module; and (b) that
    we retain the ability to build GFS2 as a standalone single node
    filesystem with out requiring the DLM.
    This patch needs a lot of testing, hence my keeping it I restarted
    my -git tree after the last merge window. That way, this has the maximum
    exposure before its merged. This is (modulo a few minor bug fixes) the
    same patch that I've been posting on and off the the last three months
    and its passed a number of different tests so far.
    Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>