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, 226 deletions

diff --git a/fs/gfs2/locking/dlm/sysfs.c b/fs/gfs2/locking/dlm/sysfs.c
deleted file mode 100644
index 9b7edcf7bd49..000000000000
--- a/fs/gfs2/locking/dlm/sysfs.c
+++ /dev/null
@@ -1,226 +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.
- */
-
-#include <linux/ctype.h>
-#include <linux/stat.h>
-
-#include "lock_dlm.h"
-
-static ssize_t proto_name_show(struct gdlm_ls *ls, char *buf)
-{
-	return sprintf(buf, "%s\n", gdlm_ops.lm_proto_name);
-}
-
-static ssize_t block_show(struct gdlm_ls *ls, char *buf)
-{
-	ssize_t ret;
-	int val = 0;
-
-	if (test_bit(DFL_BLOCK_LOCKS, &ls->flags))
-		val = 1;
-	ret = sprintf(buf, "%d\n", val);
-	return ret;
-}
-
-static ssize_t block_store(struct gdlm_ls *ls, const char *buf, size_t len)
-{
-	ssize_t ret = len;
-	int val;
-
-	val = simple_strtol(buf, NULL, 0);
-
-	if (val == 1)
-		set_bit(DFL_BLOCK_LOCKS, &ls->flags);
-	else if (val == 0) {
-		clear_bit(DFL_BLOCK_LOCKS, &ls->flags);
-		gdlm_submit_delayed(ls);
-	} else {
-		ret = -EINVAL;
-	}
-	return ret;
-}
-
-static ssize_t withdraw_show(struct gdlm_ls *ls, char *buf)
-{
-	ssize_t ret;
-	int val = 0;
-
-	if (test_bit(DFL_WITHDRAW, &ls->flags))
-		val = 1;
-	ret = sprintf(buf, "%d\n", val);
-	return ret;
-}
-
-static ssize_t withdraw_store(struct gdlm_ls *ls, const char *buf, size_t len)
-{
-	ssize_t ret = len;
-	int val;
-
-	val = simple_strtol(buf, NULL, 0);
-
-	if (val == 1)
-		set_bit(DFL_WITHDRAW, &ls->flags);
-	else
-		ret = -EINVAL;
-	wake_up(&ls->wait_control);
-	return ret;
-}
-
-static ssize_t id_show(struct gdlm_ls *ls, char *buf)
-{
-	return sprintf(buf, "%u\n", ls->id);
-}
-
-static ssize_t jid_show(struct gdlm_ls *ls, char *buf)
-{
-	return sprintf(buf, "%d\n", ls->jid);
-}
-
-static ssize_t first_show(struct gdlm_ls *ls, char *buf)
-{
-	return sprintf(buf, "%d\n", ls->first);
-}
-
-static ssize_t first_done_show(struct gdlm_ls *ls, char *buf)
-{
-	return sprintf(buf, "%d\n", ls->first_done);
-}
-
-static ssize_t recover_show(struct gdlm_ls *ls, char *buf)
-{
-	return sprintf(buf, "%d\n", ls->recover_jid);
-}
-
-static ssize_t recover_store(struct gdlm_ls *ls, const char *buf, size_t len)
-{
-	ls->recover_jid = simple_strtol(buf, NULL, 0);
-	ls->fscb(ls->sdp, LM_CB_NEED_RECOVERY, &ls->recover_jid);
-	return len;
-}
-
-static ssize_t recover_done_show(struct gdlm_ls *ls, char *buf)
-{
-	return sprintf(buf, "%d\n", ls->recover_jid_done);
-}
-
-static ssize_t recover_status_show(struct gdlm_ls *ls, char *buf)
-{
-	return sprintf(buf, "%d\n", ls->recover_jid_status);
-}
-
-struct gdlm_attr {
-	struct attribute attr;
-	ssize_t (*show)(struct gdlm_ls *, char *);
-	ssize_t (*store)(struct gdlm_ls *, const char *, size_t);
-};
-
-#define GDLM_ATTR(_name,_mode,_show,_store) \
-static struct gdlm_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
-
-GDLM_ATTR(proto_name,     0444, proto_name_show,     NULL);
-GDLM_ATTR(block,          0644, block_show,          block_store);
-GDLM_ATTR(withdraw,       0644, withdraw_show,       withdraw_store);
-GDLM_ATTR(id,             0444, id_show,             NULL);
-GDLM_ATTR(jid,            0444, jid_show,            NULL);
-GDLM_ATTR(first,          0444, first_show,          NULL);
-GDLM_ATTR(first_done,     0444, first_done_show,     NULL);
-GDLM_ATTR(recover,        0644, recover_show,        recover_store);
-GDLM_ATTR(recover_done,   0444, recover_done_show,   NULL);
-GDLM_ATTR(recover_status, 0444, recover_status_show, NULL);
-
-static struct attribute *gdlm_attrs[] = {
-	&gdlm_attr_proto_name.attr,
-	&gdlm_attr_block.attr,
-	&gdlm_attr_withdraw.attr,
-	&gdlm_attr_id.attr,
-	&gdlm_attr_jid.attr,
-	&gdlm_attr_first.attr,
-	&gdlm_attr_first_done.attr,
-	&gdlm_attr_recover.attr,
-	&gdlm_attr_recover_done.attr,
-	&gdlm_attr_recover_status.attr,
-	NULL,
-};
-
-static ssize_t gdlm_attr_show(struct kobject *kobj, struct attribute *attr,
-			      char *buf)
-{
-	struct gdlm_ls *ls = container_of(kobj, struct gdlm_ls, kobj);
-	struct gdlm_attr *a = container_of(attr, struct gdlm_attr, attr);
-	return a->show ? a->show(ls, buf) : 0;
-}
-
-static ssize_t gdlm_attr_store(struct kobject *kobj, struct attribute *attr,
-			       const char *buf, size_t len)
-{
-	struct gdlm_ls *ls = container_of(kobj, struct gdlm_ls, kobj);
-	struct gdlm_attr *a = container_of(attr, struct gdlm_attr, attr);
-	return a->store ? a->store(ls, buf, len) : len;
-}
-
-static struct sysfs_ops gdlm_attr_ops = {
-	.show  = gdlm_attr_show,
-	.store = gdlm_attr_store,
-};
-
-static struct kobj_type gdlm_ktype = {
-	.default_attrs = gdlm_attrs,
-	.sysfs_ops     = &gdlm_attr_ops,
-};
-
-static struct kset *gdlm_kset;
-
-int gdlm_kobject_setup(struct gdlm_ls *ls, struct kobject *fskobj)
-{
-	int error;
-
-	ls->kobj.kset = gdlm_kset;
-	error = kobject_init_and_add(&ls->kobj, &gdlm_ktype, fskobj,
-				     "lock_module");
-	if (error)
-		log_error("can't register kobj %d", error);
-	kobject_uevent(&ls->kobj, KOBJ_ADD);
-
-	return error;
-}
-
-void gdlm_kobject_release(struct gdlm_ls *ls)
-{
-	kobject_put(&ls->kobj);
-}
-
-static int gdlm_uevent(struct kset *kset, struct kobject *kobj,
-		       struct kobj_uevent_env *env)
-{
-        struct gdlm_ls *ls = container_of(kobj, struct gdlm_ls, kobj);
-        add_uevent_var(env, "LOCKTABLE=%s:%s", ls->clustername, ls->fsname);
-        add_uevent_var(env, "LOCKPROTO=lock_dlm");
-        return 0;
-}
-
-static struct kset_uevent_ops gdlm_uevent_ops = {
-	.uevent = gdlm_uevent,
-};
-
-
-int gdlm_sysfs_init(void)
-{
-	gdlm_kset = kset_create_and_add("lock_dlm", &gdlm_uevent_ops, kernel_kobj);
-	if (!gdlm_kset) {
-		printk(KERN_WARNING "%s: can not create kset\n", __func__);
-		return -ENOMEM;
-	}
-	return 0;
-}
-
-void gdlm_sysfs_exit(void)
-{
-	kset_unregister(gdlm_kset);
-}
-