GFS2: Clean up of gdlm_lock function

The DLM never returns -EAGAIN in response to dlm_lock(), and even
if it did, the test in gdlm_lock() was wrong anyway. Once that
test is removed, it is possible to greatly simplify this code
by simply using a "normal" error return code (0 for success).

We then no longer need the LM_OUT_ASYNC return code which can
be removed.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

3 files changed, 17 insertions, 40 deletions

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index a9b53a48abeb..2dd1d7238111 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -541,21 +541,6 @@ out_locked:
         spin_unlock(&gl->gl_spin);
 }
 
-static unsigned int gfs2_lm_lock(struct gfs2_sbd *sdp, void *lock,
-                                 unsigned int req_state,
-                                 unsigned int flags)
-{
-        int ret = LM_OUT_ERROR;
-
-        if (!sdp->sd_lockstruct.ls_ops->lm_lock)
-                return req_state == LM_ST_UNLOCKED ? 0 : req_state;
-
-        if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
-                ret = sdp->sd_lockstruct.ls_ops->lm_lock(lock,
-                                                         req_state, flags);
-        return ret;
-}
-
 /**
  * do_xmote - Calls the DLM to change the state of a lock
  * @gl: The lock state
@@ -575,8 +560,8 @@ __acquires(&gl->gl_spin)
 
         lck_flags &= (LM_FLAG_TRY | LM_FLAG_TRY_1CB | LM_FLAG_NOEXP |
                       LM_FLAG_PRIORITY);
-        BUG_ON(gl->gl_state == target);
-        BUG_ON(gl->gl_state == gl->gl_target);
+        GLOCK_BUG_ON(gl, gl->gl_state == target);
+        GLOCK_BUG_ON(gl, gl->gl_state == gl->gl_target);
         if ((target == LM_ST_UNLOCKED || target == LM_ST_DEFERRED) &&
             glops->go_inval) {
                 set_bit(GLF_INVALIDATE_IN_PROGRESS, &gl->gl_flags);
@@ -594,15 +579,17 @@ __acquires(&gl->gl_spin)
             gl->gl_state == LM_ST_DEFERRED) &&
             !(lck_flags & (LM_FLAG_TRY | LM_FLAG_TRY_1CB)))
                 lck_flags |= LM_FLAG_TRY_1CB;
-        ret = gfs2_lm_lock(sdp, gl, target, lck_flags);
 
-        if (!(ret & LM_OUT_ASYNC)) {
-                finish_xmote(gl, ret);
+        if (sdp->sd_lockstruct.ls_ops->lm_lock) {
+                /* lock_dlm */
+                ret = sdp->sd_lockstruct.ls_ops->lm_lock(gl, target, lck_flags);
+                GLOCK_BUG_ON(gl, ret);
+        } else { /* lock_nolock */
+                finish_xmote(gl, target);
                 if (queue_delayed_work(glock_workqueue, &gl->gl_work, 0) == 0)
                         gfs2_glock_put(gl);
-        } else {
-                GLOCK_BUG_ON(gl, ret != LM_OUT_ASYNC);
         }
+
         spin_lock(&gl->gl_spin);
 }
 
diff --git a/fs/gfs2/glock.h b/fs/gfs2/glock.h
index a12d11767752..ba6865c6e7e0 100644
--- a/fs/gfs2/glock.h
+++ b/fs/gfs2/glock.h
@@ -91,7 +91,7 @@ enum {
 #define GL_NOCACHE              0x00000400
   
 /*
- * lm_lock() and lm_async_cb return flags
+ * lm_async_cb return flags
  *
  * LM_OUT_ST_MASK
  * Masks the lower two bits of lock state in the returned value.
@@ -99,15 +99,11 @@ enum {
  * LM_OUT_CANCELED
  * The lock request was canceled.
  *
- * LM_OUT_ASYNC
- * The result of the request will be returned in an LM_CB_ASYNC callback.
- *
  */
 
 #define LM_OUT_ST_MASK          0x00000003
 #define LM_OUT_CANCELED         0x00000008
-#define LM_OUT_ASYNC            0x00000080
-#define LM_OUT_ERROR            0x00000100
+#define LM_OUT_ERROR            0x00000004
 
 /*
  * lm_recovery_done() messages
@@ -124,8 +120,8 @@ struct lm_lockops {
         void (*lm_unmount) (struct gfs2_sbd *sdp);
         void (*lm_withdraw) (struct gfs2_sbd *sdp);
         void (*lm_put_lock) (struct kmem_cache *cachep, struct gfs2_glock *gl);
-        unsigned int (*lm_lock) (struct gfs2_glock *gl,
-                                 unsigned int req_state, unsigned int flags);
+        int (*lm_lock) (struct gfs2_glock *gl, unsigned int req_state,
+                        unsigned int flags);
         void (*lm_cancel) (struct gfs2_glock *gl);
         const match_table_t *lm_tokens;
 };
diff --git a/fs/gfs2/lock_dlm.c b/fs/gfs2/lock_dlm.c
index 1c09425b45fd..f40ce34c803e 100644
--- a/fs/gfs2/lock_dlm.c
+++ b/fs/gfs2/lock_dlm.c
@@ -146,11 +146,10 @@ static u32 make_flags(const u32 lkid, const unsigned int gfs_flags,
         return lkf;
 }
 
-static unsigned int gdlm_lock(struct gfs2_glock *gl,
-                              unsigned int req_state, unsigned int flags)
+static int gdlm_lock(struct gfs2_glock *gl, unsigned int req_state,
+                     unsigned int flags)
 {
         struct lm_lockstruct *ls = &gl->gl_sbd->sd_lockstruct;
-        int error;
         int req;
         u32 lkf;
 
@@ -162,13 +161,8 @@ static unsigned int gdlm_lock(struct gfs2_glock *gl,
          * Submit the actual lock request.
          */
 
-        error = dlm_lock(ls->ls_dlm, req, &gl->gl_lksb, lkf, gl->gl_strname,
-                         GDLM_STRNAME_BYTES - 1, 0, gdlm_ast, gl, gdlm_bast);
-        if (error == -EAGAIN)
-                return 0;
-        if (error)
-                return LM_OUT_ERROR;
-        return LM_OUT_ASYNC;
+        return dlm_lock(ls->ls_dlm, req, &gl->gl_lksb, lkf, gl->gl_strname,
+                        GDLM_STRNAME_BYTES - 1, 0, gdlm_ast, gl, gdlm_bast);
 }
 
 static void gdlm_put_lock(struct kmem_cache *cachep, struct gfs2_glock *gl)