• Steven Whitehouse's avatar
    [GFS2] Clean up the glock core · 6802e340
    Steven Whitehouse authored
    This patch implements a number of cleanups to the core of the
    GFS2 glock code. As a result a lot of code is removed. It looks
    like a really big change, but actually a large part of this patch
    is either removing or moving existing code.
    There are some new bits too though, such as the new run_queue()
    function which is considerably streamlined. Highlights of this
    patch include:
     o Fixes a cluster coherency bug during SH -> EX lock conversions
     o Removes the "glmutex" code in favour of a single bit lock
     o Removes the ->go_xmote_bh() for inodes since it was duplicating
     o We now only use the ->lm_lock() function for both locks and
       unlocks (i.e. unlock is a lock with target mode LM_ST_UNLOCKED)
     o The fast path is considerably shortly, giving performance gains
       especially with lock_nolock
     o The glock_workqueue is now used for all the callbacks from the DLM
       which allows us to simplify the lock_dlm module (see following patch)
     o The way is now open to make further changes such as eliminating the two
       threads (gfs2_glockd and gfs2_scand) in favour of a more efficient
    This patch has undergone extensive testing with various test suites
    so it should be pretty stable by now.
    Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
    Cc: Bob Peterson <rpeterso@redhat.com>
glock.c 46.2 KB