GFS2: Merge lock_dlm module into GFS2

This is the big patch that I've been working on for some time
now. There are many reasons for wanting to make this change
such as:
 o Reducing overhead by eliminating duplicated fields between structures
 o Simplifcation of the code (reduces the code size by a fair bit)
 o The locking interface is now the DLM interface itself as proposed
   some time ago.
 o Fewer lookups of glocks when processing replies from the DLM
 o Fewer memory allocations/deallocations for each glock
 o Scope to do further optimisations in the future (but this patch is
   more than big enough for now!)

Please note that (a) this patch relates to the lock_dlm module and
not the DLM itself, that is still a separate module; and (b) that
we retain the ability to build GFS2 as a standalone single node
filesystem with out requiring the DLM.

This patch needs a lot of testing, hence my keeping it I restarted
my -git tree after the last merge window. That way, this has the maximum
exposure before its merged. This is (modulo a few minor bug fixes) the
same patch that I've been posting on and off the the last three months
and its passed a number of different tests so far.

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

1 files changed, 0 insertions, 166 deletions

diff --git a/fs/gfs2/locking/dlm/lock_dlm.h b/fs/gfs2/locking/dlm/lock_dlm.h
deleted file mode 100644
index 3c98e7c6f93bb5..00000000000000
--- a/fs/gfs2/locking/dlm/lock_dlm.h
+++ /dev/null
@@ -1,166 +0,0 @@
-/*
- * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
- * Copyright (C) 2004-2005 Red Hat, Inc.  All rights reserved.
- *
- * This copyrighted material is made available to anyone wishing to use,
- * modify, copy, or redistribute it subject to the terms and conditions
- * of the GNU General Public License version 2.
- */
-
-#ifndef LOCK_DLM_DOT_H
-#define LOCK_DLM_DOT_H
-
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <linux/types.h>
-#include <linux/string.h>
-#include <linux/list.h>
-#include <linux/socket.h>
-#include <linux/delay.h>
-#include <linux/kthread.h>
-#include <linux/kobject.h>
-#include <linux/fcntl.h>
-#include <linux/wait.h>
-#include <net/sock.h>
-
-#include <linux/dlm.h>
-#include <linux/dlm_plock.h>
-#include <linux/lm_interface.h>
-
-/*
- * Internally, we prefix things with gdlm_ and GDLM_ (for gfs-dlm) since a
- * prefix of lock_dlm_ gets awkward.  Externally, GFS refers to this module
- * as "lock_dlm".
- */
-
-#define GDLM_STRNAME_BYTES	24
-#define GDLM_LVB_SIZE		32
-#define GDLM_DROP_COUNT		0
-#define GDLM_DROP_PERIOD	60
-#define GDLM_NAME_LEN		128
-
-/* GFS uses 12 bytes to identify a resource (32 bit type + 64 bit number).
-   We sprintf these numbers into a 24 byte string of hex values to make them
-   human-readable (to make debugging simpler.) */
-
-struct gdlm_strname {
-	unsigned char		name[GDLM_STRNAME_BYTES];
-	unsigned short		namelen;
-};
-
-enum {
-	DFL_BLOCK_LOCKS		= 0,
-	DFL_SPECTATOR		= 1,
-	DFL_WITHDRAW		= 2,
-};
-
-struct gdlm_ls {
-	u32		id;
-	int			jid;
-	int			first;
-	int			first_done;
-	unsigned long		flags;
-	struct kobject		kobj;
-	char			clustername[GDLM_NAME_LEN];
-	char			fsname[GDLM_NAME_LEN];
-	int			fsflags;
-	dlm_lockspace_t		*dlm_lockspace;
-	lm_callback_t		fscb;
-	struct gfs2_sbd		*sdp;
-	int			recover_jid;
-	int			recover_jid_done;
-	int			recover_jid_status;
-	spinlock_t		async_lock;
-	struct list_head	delayed;
-	struct list_head	submit;
-	u32		all_locks_count;
-	wait_queue_head_t	wait_control;
-	struct task_struct	*thread;
-	wait_queue_head_t	thread_wait;
-};
-
-enum {
-	LFL_NOBLOCK		= 0,
-	LFL_NOCACHE		= 1,
-	LFL_DLM_UNLOCK		= 2,
-	LFL_DLM_CANCEL		= 3,
-	LFL_SYNC_LVB		= 4,
-	LFL_FORCE_PROMOTE	= 5,
-	LFL_REREQUEST		= 6,
-	LFL_ACTIVE		= 7,
-	LFL_INLOCK		= 8,
-	LFL_CANCEL		= 9,
-	LFL_NOBAST		= 10,
-	LFL_HEADQUE		= 11,
-	LFL_UNLOCK_DELETE	= 12,
-	LFL_AST_WAIT		= 13,
-};
-
-struct gdlm_lock {
-	struct gdlm_ls		*ls;
-	struct lm_lockname	lockname;
-	struct gdlm_strname	strname;
-	char			*lvb;
-	struct dlm_lksb		lksb;
-
-	s16			cur;
-	s16			req;
-	s16			prev_req;
-	u32			lkf;		/* dlm flags DLM_LKF_ */
-	unsigned long		flags;		/* lock_dlm flags LFL_ */
-
-	struct list_head	delay_list;	/* delayed */
-	struct gdlm_lock	*hold_null;	/* NL lock for hold_lvb */
-};
-
-#define gdlm_assert(assertion, fmt, args...)                                  \
-do {                                                                          \
-	if (unlikely(!(assertion))) {                                         \
-		printk(KERN_EMERG "lock_dlm: fatal assertion failed \"%s\"\n" \
-				  "lock_dlm:  " fmt "\n",                     \
-				  #assertion, ##args);                        \
-		BUG();                                                        \
-	}                                                                     \
-} while (0)
-
-#define log_print(lev, fmt, arg...) printk(lev "lock_dlm: " fmt "\n" , ## arg)
-#define log_info(fmt, arg...)  log_print(KERN_INFO , fmt , ## arg)
-#define log_error(fmt, arg...) log_print(KERN_ERR , fmt , ## arg)
-#ifdef LOCK_DLM_LOG_DEBUG
-#define log_debug(fmt, arg...) log_print(KERN_DEBUG , fmt , ## arg)
-#else
-#define log_debug(fmt, arg...)
-#endif
-
-/* sysfs.c */
-
-int gdlm_sysfs_init(void);
-void gdlm_sysfs_exit(void);
-int gdlm_kobject_setup(struct gdlm_ls *, struct kobject *);
-void gdlm_kobject_release(struct gdlm_ls *);
-
-/* thread.c */
-
-int gdlm_init_threads(struct gdlm_ls *);
-void gdlm_release_threads(struct gdlm_ls *);
-
-/* lock.c */
-
-void gdlm_submit_delayed(struct gdlm_ls *);
-unsigned int gdlm_do_lock(struct gdlm_lock *);
-
-int gdlm_get_lock(void *, struct lm_lockname *, void **);
-void gdlm_put_lock(void *);
-unsigned int gdlm_lock(void *, unsigned int, unsigned int, unsigned int);
-unsigned int gdlm_unlock(void *, unsigned int);
-void gdlm_cancel(void *);
-int gdlm_hold_lvb(void *, char **);
-void gdlm_unhold_lvb(void *, char *);
-
-/* mount.c */
-
-extern const struct lm_lockops gdlm_ops;
-
-#endif
-