[GFS2] Move glock hash table out of superblock

There are several reasons why we want to do this:
 - Firstly its large and thus we'll scale better with multiple
   GFS2 fs mounted at the same time
 - Secondly its easier to scale its size as required (thats a plan
   for later patches)
 - Thirdly, we can use kzalloc rather than vmalloc when allocating
   the superblock (its now only 4888 bytes)
 - Fourth its all part of my plan to eventually be able to use RCU
   with the glock hash.

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

1 files changed, 5 insertions, 7 deletions

diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h
index 225924ca6b3e..61849607211f 100644
--- a/fs/gfs2/incore.h
+++ b/fs/gfs2/incore.h
@@ -30,7 +30,6 @@ struct gfs2_quota_data;
 struct gfs2_trans;
 struct gfs2_ail;
 struct gfs2_jdesc;
-struct gfs2_gl_hash_bucket;
 struct gfs2_sbd;
 
 typedef void (*gfs2_glop_bh_t) (struct gfs2_glock *gl, unsigned int ret);
@@ -107,6 +106,11 @@ struct gfs2_bufdata {
 	struct list_head bd_ail_gl_list;
 };
 
+struct gfs2_gl_hash_bucket {
+        rwlock_t hb_lock;
+        struct list_head hb_list;
+};
+
 struct gfs2_glock_operations {
 	void (*go_xmote_th) (struct gfs2_glock * gl, unsigned int state,
 			     int flags);
@@ -442,11 +446,6 @@ struct gfs2_tune {
 	unsigned int gt_statfs_slow;
 };
 
-struct gfs2_gl_hash_bucket {
-	rwlock_t hb_lock;
-	struct list_head hb_list;
-};
-
 enum {
 	SDF_JOURNAL_CHECKED	= 0,
 	SDF_JOURNAL_LIVE	= 1,
@@ -489,7 +488,6 @@ struct gfs2_sbd {
 	/* Lock Stuff */
 
 	struct lm_lockstruct sd_lockstruct;
-	struct gfs2_gl_hash_bucket sd_gl_hash[GFS2_GL_HASH_SIZE];
 	struct list_head sd_reclaim_list;
 	spinlock_t sd_reclaim_lock;
 	wait_queue_head_t sd_reclaim_wq;