[Cluster-devel] [GFS2 PATCH 3/3] gfs2: Eliminate go_xmote_bh in favor of go_lock

[Bob Peterson <rpeterso@redhat.com>]

Before this patch, the freeze glock was the only glock to use the
go_xmote_bh glock op (glop). The go_xmote_bh glop is done when
a glock is locked. But so is go_lock. This patch eliminates the
glop altogether in favor of just using go_lock for the freeze
glock. This is for better consistency, readability, etc.
Using go_lock was previously not possible because of the bug
fixed by the previous patch.

I also fixed a misleading comment in do_promote.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
---
 fs/gfs2/glock.c  | 12 +-----------
 fs/gfs2/glops.c  |  6 +++---
 fs/gfs2/incore.h |  1 -
 3 files changed, 4 insertions(+), 15 deletions(-)

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index d43eed1696ab..1d421998535e 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -384,7 +384,7 @@ static void do_error(struct gfs2_glock *gl, const int ret)
  * do_promote - promote as many requests as possible on the current queue
  * @gl: The glock
  * 
- * Returns: 1 if there is a blocked holder at the head of the list, or 2
+ * Returns: 1 if there is a blocked waiter at the head of the list, or 2
  *          if a type specific operation is underway.
  */
 
@@ -504,7 +504,6 @@ static void gfs2_demote_wake(struct gfs2_glock *gl)
 
 static void finish_xmote(struct gfs2_glock *gl, unsigned int ret)
 {
-	const struct gfs2_glock_operations *glops = gl->gl_ops;
 	struct gfs2_holder *gh;
 	unsigned state = ret & LM_OUT_ST_MASK;
 	int rv;
@@ -562,15 +561,6 @@ static void finish_xmote(struct gfs2_glock *gl, unsigned int ret)
 	if (test_and_clear_bit(GLF_DEMOTE_IN_PROGRESS, &gl->gl_flags))
 		gfs2_demote_wake(gl);
 	if (state != LM_ST_UNLOCKED) {
-		if (gh && glops->go_xmote_bh) {
-			spin_unlock(&gl->gl_lockref.lock);
-			rv = glops->go_xmote_bh(gh);
-			spin_lock(&gl->gl_lockref.lock);
-			if (rv) {
-				do_error(gl, rv);
-				goto out;
-			}
-		}
 		rv = do_promote(gl);
 		if (rv == 2)
 			goto out_locked;
diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
index 8ae2f33e014e..5067e89c32e6 100644
--- a/fs/gfs2/glops.c
+++ b/fs/gfs2/glops.c
@@ -597,10 +597,10 @@ static int freeze_go_sync(struct gfs2_glock *gl)
 }
 
 /**
- * freeze_go_xmote_bh - After promoting/demoting the freeze glock
+ * freeze_go_lock - After promoting/demoting the freeze glock
  * @gh: the holder of the glock
  */
-static int freeze_go_xmote_bh(struct gfs2_holder *gh)
+static int freeze_go_lock(struct gfs2_holder *gh)
 {
 	struct gfs2_glock *gl = gh->gh_gl;
 	struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
@@ -768,7 +768,7 @@ const struct gfs2_glock_operations gfs2_rgrp_glops = {
 
 const struct gfs2_glock_operations gfs2_freeze_glops = {
 	.go_sync = freeze_go_sync,
-	.go_xmote_bh = freeze_go_xmote_bh,
+	.go_lock = freeze_go_lock,
 	.go_demote_ok = freeze_go_demote_ok,
 	.go_type = LM_TYPE_NONDISK,
 	.go_flags = GLOF_NONDISK,
diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 354d6230d0f7..04ac1537fee7 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -217,7 +217,6 @@ struct lm_lockname {
 
 struct gfs2_glock_operations {
 	int (*go_sync) (struct gfs2_glock *gl);
-	int (*go_xmote_bh)(struct gfs2_holder *gh);
 	void (*go_inval) (struct gfs2_glock *gl, int flags);
 	int (*go_demote_ok) (const struct gfs2_glock *gl);
 	int (*go_lock) (struct gfs2_holder *gh);
-- 
2.31.1