[GFS2] The lock modules for GFS2

This patch contains the pluggable locking modules
for GFS2.

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

1 files changed, 315 insertions, 0 deletions

diff --git a/fs/gfs2/locking/dlm/sysfs.c b/fs/gfs2/locking/dlm/sysfs.c
new file mode 100644
index 000000000000..8964733f55e4
--- /dev/null
+++ b/fs/gfs2/locking/dlm/sysfs.c
@@ -0,0 +1,315 @@
+/******************************************************************************
+*******************************************************************************
+**
+**  Copyright (C) 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 v.2.
+**
+*******************************************************************************
+******************************************************************************/
+
+#include <linux/ctype.h>
+#include <linux/stat.h>
+
+#include "lock_dlm.h"
+
+static ssize_t gdlm_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 gdlm_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 gdlm_mounted_show(struct gdlm_ls *ls, char *buf)
+{
+	ssize_t ret;
+	int val = -2;
+
+	if (test_bit(DFL_TERMINATE, &ls->flags))
+		val = -1;
+	else if (test_bit(DFL_LEAVE_DONE, &ls->flags))
+		val = 0;
+	else if (test_bit(DFL_JOIN_DONE, &ls->flags))
+		val = 1;
+	ret = sprintf(buf, "%d\n", val);
+	return ret;
+}
+
+static ssize_t gdlm_mounted_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_JOIN_DONE, &ls->flags);
+	else if (val == 0)
+		set_bit(DFL_LEAVE_DONE, &ls->flags);
+	else if (val == -1) {
+		set_bit(DFL_TERMINATE, &ls->flags);
+		set_bit(DFL_JOIN_DONE, &ls->flags);
+		set_bit(DFL_LEAVE_DONE, &ls->flags);
+	} else
+		ret = -EINVAL;
+	wake_up(&ls->wait_control);
+	return ret;
+}
+
+static ssize_t gdlm_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 gdlm_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 gdlm_jid_show(struct gdlm_ls *ls, char *buf)
+{
+	return sprintf(buf, "%u\n", ls->jid);
+}
+
+static ssize_t gdlm_jid_store(struct gdlm_ls *ls, const char *buf, size_t len)
+{
+	ls->jid = simple_strtol(buf, NULL, 0);
+	return len;
+}
+
+static ssize_t gdlm_first_show(struct gdlm_ls *ls, char *buf)
+{
+	return sprintf(buf, "%u\n", ls->first);
+}
+
+static ssize_t gdlm_first_store(struct gdlm_ls *ls, const char *buf, size_t len)
+{
+	ls->first = simple_strtol(buf, NULL, 0);
+	return len;
+}
+
+static ssize_t gdlm_first_done_show(struct gdlm_ls *ls, char *buf)
+{
+	return sprintf(buf, "%d\n", ls->first_done);
+}
+
+static ssize_t gdlm_recover_show(struct gdlm_ls *ls, char *buf)
+{
+	return sprintf(buf, "%u\n", ls->recover_jid);
+}
+
+static ssize_t gdlm_recover_store(struct gdlm_ls *ls, const char *buf, size_t len)
+{
+	ls->recover_jid = simple_strtol(buf, NULL, 0);
+	ls->fscb(ls->fsdata, LM_CB_NEED_RECOVERY, &ls->recover_jid);
+	return len;
+}
+
+static ssize_t gdlm_recover_done_show(struct gdlm_ls *ls, char *buf)
+{
+	ssize_t ret;
+	ret = sprintf(buf, "%d\n", ls->recover_done);
+	return ret;
+}
+
+static ssize_t gdlm_cluster_show(struct gdlm_ls *ls, char *buf)
+{
+	ssize_t ret;
+	ret = sprintf(buf, "%s\n", ls->clustername);
+	return ret;
+}
+
+static ssize_t gdlm_options_show(struct gdlm_ls *ls, char *buf)
+{
+	ssize_t ret = 0;
+
+	if (ls->fsflags & LM_MFLAG_SPECTATOR)
+		ret += sprintf(buf, "spectator ");
+
+	return ret;
+}
+
+struct gdlm_attr {
+	struct attribute attr;
+	ssize_t (*show)(struct gdlm_ls *, char *);
+	ssize_t (*store)(struct gdlm_ls *, const char *, size_t);
+};
+
+static struct gdlm_attr gdlm_attr_block = {
+	.attr  = {.name = "block", .mode = S_IRUGO | S_IWUSR},
+	.show  = gdlm_block_show,
+	.store = gdlm_block_store
+};
+
+static struct gdlm_attr gdlm_attr_mounted = {
+	.attr  = {.name = "mounted", .mode = S_IRUGO | S_IWUSR},
+	.show  = gdlm_mounted_show,
+	.store = gdlm_mounted_store
+};
+
+static struct gdlm_attr gdlm_attr_withdraw = {
+	.attr  = {.name = "withdraw", .mode = S_IRUGO | S_IWUSR},
+	.show  = gdlm_withdraw_show,
+	.store = gdlm_withdraw_store
+};
+
+static struct gdlm_attr gdlm_attr_jid = {
+	.attr  = {.name = "jid", .mode = S_IRUGO | S_IWUSR},
+	.show  = gdlm_jid_show,
+	.store = gdlm_jid_store
+};
+
+static struct gdlm_attr gdlm_attr_first = {
+	.attr  = {.name = "first", .mode = S_IRUGO | S_IWUSR},
+	.show  = gdlm_first_show,
+	.store = gdlm_first_store
+};
+
+static struct gdlm_attr gdlm_attr_first_done = {
+	.attr  = {.name = "first_done", .mode = S_IRUGO},
+	.show  = gdlm_first_done_show,
+};
+
+static struct gdlm_attr gdlm_attr_recover = {
+	.attr  = {.name = "recover", .mode = S_IRUGO | S_IWUSR},
+	.show  = gdlm_recover_show,
+	.store = gdlm_recover_store
+};
+
+static struct gdlm_attr gdlm_attr_recover_done = {
+	.attr  = {.name = "recover_done", .mode = S_IRUGO | S_IWUSR},
+	.show  = gdlm_recover_done_show,
+};
+
+static struct gdlm_attr gdlm_attr_cluster = {
+	.attr  = {.name = "cluster", .mode = S_IRUGO | S_IWUSR},
+	.show  = gdlm_cluster_show,
+};
+
+static struct gdlm_attr gdlm_attr_options = {
+	.attr  = {.name = "options", .mode = S_IRUGO | S_IWUSR},
+	.show  = gdlm_options_show,
+};
+
+static struct attribute *gdlm_attrs[] = {
+	&gdlm_attr_block.attr,
+	&gdlm_attr_mounted.attr,
+	&gdlm_attr_withdraw.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_cluster.attr,
+	&gdlm_attr_options.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 = {
+	.subsys = &kernel_subsys,
+	.kobj   = {.name = "lock_dlm",},
+	.ktype  = &gdlm_ktype,
+};
+
+int gdlm_kobject_setup(struct gdlm_ls *ls)
+{
+	int error;
+
+	error = kobject_set_name(&ls->kobj, "%s", ls->fsname);
+	if (error)
+		return error;
+
+	ls->kobj.kset = &gdlm_kset;
+	ls->kobj.ktype = &gdlm_ktype;
+
+	error = kobject_register(&ls->kobj);
+
+	return 0;
+}
+
+void gdlm_kobject_release(struct gdlm_ls *ls)
+{
+	kobject_unregister(&ls->kobj);
+}
+
+int gdlm_sysfs_init(void)
+{
+	int error;
+
+	error = kset_register(&gdlm_kset);
+	if (error)
+		printk("lock_dlm: cannot register kset %d\n", error);
+
+	return error;
+}
+
+void gdlm_sysfs_exit(void)
+{
+	kset_unregister(&gdlm_kset);
+}
+