gfs2: Remove freeze_go_demote_ok

Before commit b77b4a4815a9 ("gfs2: Rework freeze / thaw logic"), the
freeze glock was kept around in the glock cache in shared mode without
being actively held while a filesystem is in thawed state.  In that
state, memory pressure could have eventually evicted the freeze glock,
and the freeze_go_demote_ok callback was needed to prevent that from
happening.

With the freeze / thaw rework, the freeze glock is now always actively
held in shared mode while a filesystem is thawed, and the
freeze_go_demote_ok hack is no longer needed.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
index f41ca89..5f845fd 100644 (file)
--- a/fs/gfs2/glops.c
+++ b/fs/gfs2/glops.c
@@ -613,18 +613,6 @@ static int freeze_go_xmote_bh(struct gfs2_glock *gl)
        return 0;
 }
 
-/**
- * freeze_go_demote_ok
- * @gl: the glock
- *
- * Always returns 0
- */
-
-static int freeze_go_demote_ok(const struct gfs2_glock *gl)
-{
-       return 0;
-}
-
 /**
  * iopen_go_callback - schedule the dcache entry for the inode to be deleted
  * @gl: the glock
@@ -744,7 +732,6 @@ const struct gfs2_glock_operations gfs2_rgrp_glops = {
 
 const struct gfs2_glock_operations gfs2_freeze_glops = {
        .go_xmote_bh = freeze_go_xmote_bh,
-       .go_demote_ok = freeze_go_demote_ok,
        .go_callback = freeze_go_callback,
        .go_type = LM_TYPE_NONDISK,
        .go_flags = GLOF_NONDISK,