diff options
author | Steven Whitehouse <swhiteho@redhat.com> | 2008-05-21 17:03:22 +0100 |
---|---|---|
committer | Steven Whitehouse <swhiteho@redhat.com> | 2008-06-27 09:39:22 +0100 |
commit | 6802e3400ff4549525930ee744030c36fce9cc73 (patch) | |
tree | db889bf5337c1d3bb12ebbf571c3c1cad1040496 /fs/gfs2/locking | |
parent | 543cf4cb3fe6f6cae3651ba918b9c56200b257d0 (diff) |
[GFS2] Clean up the glock core
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
->go_lock()
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
scheme.
This patch has undergone extensive testing with various test suites
so it should be pretty stable by now.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Cc: Bob Peterson <rpeterso@redhat.com>
Diffstat (limited to 'fs/gfs2/locking')
-rw-r--r-- | fs/gfs2/locking/dlm/lock.c | 3 | ||||
-rw-r--r-- | fs/gfs2/locking/nolock/main.c | 2 |
2 files changed, 5 insertions, 0 deletions
diff --git a/fs/gfs2/locking/dlm/lock.c b/fs/gfs2/locking/dlm/lock.c index cf7ea8abec87..fed9a67be0f1 100644 --- a/fs/gfs2/locking/dlm/lock.c +++ b/fs/gfs2/locking/dlm/lock.c @@ -308,6 +308,9 @@ unsigned int gdlm_lock(void *lock, unsigned int cur_state, { struct gdlm_lock *lp = lock; + if (req_state == LM_ST_UNLOCKED) + return gdlm_unlock(lock, cur_state); + clear_bit(LFL_DLM_CANCEL, &lp->flags); if (flags & LM_FLAG_NOEXP) set_bit(LFL_NOBLOCK, &lp->flags); diff --git a/fs/gfs2/locking/nolock/main.c b/fs/gfs2/locking/nolock/main.c index 284a5ece8d94..627bfb79bc8c 100644 --- a/fs/gfs2/locking/nolock/main.c +++ b/fs/gfs2/locking/nolock/main.c @@ -107,6 +107,8 @@ static void nolock_put_lock(void *lock) static unsigned int nolock_lock(void *lock, unsigned int cur_state, unsigned int req_state, unsigned int flags) { + if (req_state == LM_ST_UNLOCKED) + return 0; return req_state | LM_OUT_CACHEABLE; } |