mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-06 02:24:14 +08:00
b74271e40e
attribute_groups are not supposed to change at runtime. All functions working with attribute_groups provided by <linux/sysfs.h> work with const attribute_group. So mark the non-const structs as const. File size before: text data bss dec hex filename 4402 1088 38 5528 1598 fs/ocfs2/stackglue.o File size After adding 'const': text data bss dec hex filename 4442 1024 38 5504 1580 fs/ocfs2/stackglue.o Link: http://lkml.kernel.org/r/cab4e59b4918db3ed2ec77073a4cb310c4429ef5.1498808026.git.arvind.yadav.cs@gmail.com Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com> Cc: Mark Fasheh <mfasheh@versity.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Junxiao Bi <junxiao.bi@oracle.com> Cc: Joseph Qi <jiangqi903@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
754 lines
18 KiB
C
754 lines
18 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
|
|
* vim: noexpandtab sw=8 ts=8 sts=0:
|
|
*
|
|
* stackglue.c
|
|
*
|
|
* Code which implements an OCFS2 specific interface to underlying
|
|
* cluster stacks.
|
|
*
|
|
* Copyright (C) 2007, 2009 Oracle. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public
|
|
* License as published by the Free Software Foundation, version 2.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*/
|
|
|
|
#include <linux/list.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/kmod.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/kobject.h>
|
|
#include <linux/sysfs.h>
|
|
#include <linux/sysctl.h>
|
|
|
|
#include "ocfs2_fs.h"
|
|
|
|
#include "stackglue.h"
|
|
|
|
#define OCFS2_STACK_PLUGIN_O2CB "o2cb"
|
|
#define OCFS2_STACK_PLUGIN_USER "user"
|
|
#define OCFS2_MAX_HB_CTL_PATH 256
|
|
|
|
static struct ocfs2_protocol_version locking_max_version;
|
|
static DEFINE_SPINLOCK(ocfs2_stack_lock);
|
|
static LIST_HEAD(ocfs2_stack_list);
|
|
static char cluster_stack_name[OCFS2_STACK_LABEL_LEN + 1];
|
|
static char ocfs2_hb_ctl_path[OCFS2_MAX_HB_CTL_PATH] = "/sbin/ocfs2_hb_ctl";
|
|
|
|
/*
|
|
* The stack currently in use. If not null, active_stack->sp_count > 0,
|
|
* the module is pinned, and the locking protocol cannot be changed.
|
|
*/
|
|
static struct ocfs2_stack_plugin *active_stack;
|
|
|
|
inline int ocfs2_is_o2cb_active(void)
|
|
{
|
|
return !strcmp(active_stack->sp_name, OCFS2_STACK_PLUGIN_O2CB);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocfs2_is_o2cb_active);
|
|
|
|
static struct ocfs2_stack_plugin *ocfs2_stack_lookup(const char *name)
|
|
{
|
|
struct ocfs2_stack_plugin *p;
|
|
|
|
assert_spin_locked(&ocfs2_stack_lock);
|
|
|
|
list_for_each_entry(p, &ocfs2_stack_list, sp_list) {
|
|
if (!strcmp(p->sp_name, name))
|
|
return p;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int ocfs2_stack_driver_request(const char *stack_name,
|
|
const char *plugin_name)
|
|
{
|
|
int rc;
|
|
struct ocfs2_stack_plugin *p;
|
|
|
|
spin_lock(&ocfs2_stack_lock);
|
|
|
|
/*
|
|
* If the stack passed by the filesystem isn't the selected one,
|
|
* we can't continue.
|
|
*/
|
|
if (strcmp(stack_name, cluster_stack_name)) {
|
|
rc = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
if (active_stack) {
|
|
/*
|
|
* If the active stack isn't the one we want, it cannot
|
|
* be selected right now.
|
|
*/
|
|
if (!strcmp(active_stack->sp_name, plugin_name))
|
|
rc = 0;
|
|
else
|
|
rc = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
p = ocfs2_stack_lookup(plugin_name);
|
|
if (!p || !try_module_get(p->sp_owner)) {
|
|
rc = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
active_stack = p;
|
|
rc = 0;
|
|
|
|
out:
|
|
/* If we found it, pin it */
|
|
if (!rc)
|
|
active_stack->sp_count++;
|
|
|
|
spin_unlock(&ocfs2_stack_lock);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* This function looks up the appropriate stack and makes it active. If
|
|
* there is no stack, it tries to load it. It will fail if the stack still
|
|
* cannot be found. It will also fail if a different stack is in use.
|
|
*/
|
|
static int ocfs2_stack_driver_get(const char *stack_name)
|
|
{
|
|
int rc;
|
|
char *plugin_name = OCFS2_STACK_PLUGIN_O2CB;
|
|
|
|
/*
|
|
* Classic stack does not pass in a stack name. This is
|
|
* compatible with older tools as well.
|
|
*/
|
|
if (!stack_name || !*stack_name)
|
|
stack_name = OCFS2_STACK_PLUGIN_O2CB;
|
|
|
|
if (strlen(stack_name) != OCFS2_STACK_LABEL_LEN) {
|
|
printk(KERN_ERR
|
|
"ocfs2 passed an invalid cluster stack label: \"%s\"\n",
|
|
stack_name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Anything that isn't the classic stack is a user stack */
|
|
if (strcmp(stack_name, OCFS2_STACK_PLUGIN_O2CB))
|
|
plugin_name = OCFS2_STACK_PLUGIN_USER;
|
|
|
|
rc = ocfs2_stack_driver_request(stack_name, plugin_name);
|
|
if (rc == -ENOENT) {
|
|
request_module("ocfs2_stack_%s", plugin_name);
|
|
rc = ocfs2_stack_driver_request(stack_name, plugin_name);
|
|
}
|
|
|
|
if (rc == -ENOENT) {
|
|
printk(KERN_ERR
|
|
"ocfs2: Cluster stack driver \"%s\" cannot be found\n",
|
|
plugin_name);
|
|
} else if (rc == -EBUSY) {
|
|
printk(KERN_ERR
|
|
"ocfs2: A different cluster stack is in use\n");
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void ocfs2_stack_driver_put(void)
|
|
{
|
|
spin_lock(&ocfs2_stack_lock);
|
|
BUG_ON(active_stack == NULL);
|
|
BUG_ON(active_stack->sp_count == 0);
|
|
|
|
active_stack->sp_count--;
|
|
if (!active_stack->sp_count) {
|
|
module_put(active_stack->sp_owner);
|
|
active_stack = NULL;
|
|
}
|
|
spin_unlock(&ocfs2_stack_lock);
|
|
}
|
|
|
|
int ocfs2_stack_glue_register(struct ocfs2_stack_plugin *plugin)
|
|
{
|
|
int rc;
|
|
|
|
spin_lock(&ocfs2_stack_lock);
|
|
if (!ocfs2_stack_lookup(plugin->sp_name)) {
|
|
plugin->sp_count = 0;
|
|
plugin->sp_max_proto = locking_max_version;
|
|
list_add(&plugin->sp_list, &ocfs2_stack_list);
|
|
printk(KERN_INFO "ocfs2: Registered cluster interface %s\n",
|
|
plugin->sp_name);
|
|
rc = 0;
|
|
} else {
|
|
printk(KERN_ERR "ocfs2: Stack \"%s\" already registered\n",
|
|
plugin->sp_name);
|
|
rc = -EEXIST;
|
|
}
|
|
spin_unlock(&ocfs2_stack_lock);
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocfs2_stack_glue_register);
|
|
|
|
void ocfs2_stack_glue_unregister(struct ocfs2_stack_plugin *plugin)
|
|
{
|
|
struct ocfs2_stack_plugin *p;
|
|
|
|
spin_lock(&ocfs2_stack_lock);
|
|
p = ocfs2_stack_lookup(plugin->sp_name);
|
|
if (p) {
|
|
BUG_ON(p != plugin);
|
|
BUG_ON(plugin == active_stack);
|
|
BUG_ON(plugin->sp_count != 0);
|
|
list_del_init(&plugin->sp_list);
|
|
printk(KERN_INFO "ocfs2: Unregistered cluster interface %s\n",
|
|
plugin->sp_name);
|
|
} else {
|
|
printk(KERN_ERR "Stack \"%s\" is not registered\n",
|
|
plugin->sp_name);
|
|
}
|
|
spin_unlock(&ocfs2_stack_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocfs2_stack_glue_unregister);
|
|
|
|
void ocfs2_stack_glue_set_max_proto_version(struct ocfs2_protocol_version *max_proto)
|
|
{
|
|
struct ocfs2_stack_plugin *p;
|
|
|
|
spin_lock(&ocfs2_stack_lock);
|
|
if (memcmp(max_proto, &locking_max_version,
|
|
sizeof(struct ocfs2_protocol_version))) {
|
|
BUG_ON(locking_max_version.pv_major != 0);
|
|
|
|
locking_max_version = *max_proto;
|
|
list_for_each_entry(p, &ocfs2_stack_list, sp_list) {
|
|
p->sp_max_proto = locking_max_version;
|
|
}
|
|
}
|
|
spin_unlock(&ocfs2_stack_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocfs2_stack_glue_set_max_proto_version);
|
|
|
|
|
|
/*
|
|
* The ocfs2_dlm_lock() and ocfs2_dlm_unlock() functions take no argument
|
|
* for the ast and bast functions. They will pass the lksb to the ast
|
|
* and bast. The caller can wrap the lksb with their own structure to
|
|
* get more information.
|
|
*/
|
|
int ocfs2_dlm_lock(struct ocfs2_cluster_connection *conn,
|
|
int mode,
|
|
struct ocfs2_dlm_lksb *lksb,
|
|
u32 flags,
|
|
void *name,
|
|
unsigned int namelen)
|
|
{
|
|
if (!lksb->lksb_conn)
|
|
lksb->lksb_conn = conn;
|
|
else
|
|
BUG_ON(lksb->lksb_conn != conn);
|
|
return active_stack->sp_ops->dlm_lock(conn, mode, lksb, flags,
|
|
name, namelen);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocfs2_dlm_lock);
|
|
|
|
int ocfs2_dlm_unlock(struct ocfs2_cluster_connection *conn,
|
|
struct ocfs2_dlm_lksb *lksb,
|
|
u32 flags)
|
|
{
|
|
BUG_ON(lksb->lksb_conn == NULL);
|
|
|
|
return active_stack->sp_ops->dlm_unlock(conn, lksb, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocfs2_dlm_unlock);
|
|
|
|
int ocfs2_dlm_lock_status(struct ocfs2_dlm_lksb *lksb)
|
|
{
|
|
return active_stack->sp_ops->lock_status(lksb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocfs2_dlm_lock_status);
|
|
|
|
int ocfs2_dlm_lvb_valid(struct ocfs2_dlm_lksb *lksb)
|
|
{
|
|
return active_stack->sp_ops->lvb_valid(lksb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocfs2_dlm_lvb_valid);
|
|
|
|
void *ocfs2_dlm_lvb(struct ocfs2_dlm_lksb *lksb)
|
|
{
|
|
return active_stack->sp_ops->lock_lvb(lksb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocfs2_dlm_lvb);
|
|
|
|
void ocfs2_dlm_dump_lksb(struct ocfs2_dlm_lksb *lksb)
|
|
{
|
|
active_stack->sp_ops->dump_lksb(lksb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocfs2_dlm_dump_lksb);
|
|
|
|
int ocfs2_stack_supports_plocks(void)
|
|
{
|
|
return active_stack && active_stack->sp_ops->plock;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocfs2_stack_supports_plocks);
|
|
|
|
/*
|
|
* ocfs2_plock() can only be safely called if
|
|
* ocfs2_stack_supports_plocks() returned true
|
|
*/
|
|
int ocfs2_plock(struct ocfs2_cluster_connection *conn, u64 ino,
|
|
struct file *file, int cmd, struct file_lock *fl)
|
|
{
|
|
WARN_ON_ONCE(active_stack->sp_ops->plock == NULL);
|
|
if (active_stack->sp_ops->plock)
|
|
return active_stack->sp_ops->plock(conn, ino, file, cmd, fl);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocfs2_plock);
|
|
|
|
int ocfs2_cluster_connect(const char *stack_name,
|
|
const char *cluster_name,
|
|
int cluster_name_len,
|
|
const char *group,
|
|
int grouplen,
|
|
struct ocfs2_locking_protocol *lproto,
|
|
void (*recovery_handler)(int node_num,
|
|
void *recovery_data),
|
|
void *recovery_data,
|
|
struct ocfs2_cluster_connection **conn)
|
|
{
|
|
int rc = 0;
|
|
struct ocfs2_cluster_connection *new_conn;
|
|
|
|
BUG_ON(group == NULL);
|
|
BUG_ON(conn == NULL);
|
|
BUG_ON(recovery_handler == NULL);
|
|
|
|
if (grouplen > GROUP_NAME_MAX) {
|
|
rc = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (memcmp(&lproto->lp_max_version, &locking_max_version,
|
|
sizeof(struct ocfs2_protocol_version))) {
|
|
rc = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
new_conn = kzalloc(sizeof(struct ocfs2_cluster_connection),
|
|
GFP_KERNEL);
|
|
if (!new_conn) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
strlcpy(new_conn->cc_name, group, GROUP_NAME_MAX + 1);
|
|
new_conn->cc_namelen = grouplen;
|
|
if (cluster_name_len)
|
|
strlcpy(new_conn->cc_cluster_name, cluster_name,
|
|
CLUSTER_NAME_MAX + 1);
|
|
new_conn->cc_cluster_name_len = cluster_name_len;
|
|
new_conn->cc_recovery_handler = recovery_handler;
|
|
new_conn->cc_recovery_data = recovery_data;
|
|
|
|
new_conn->cc_proto = lproto;
|
|
/* Start the new connection at our maximum compatibility level */
|
|
new_conn->cc_version = lproto->lp_max_version;
|
|
|
|
/* This will pin the stack driver if successful */
|
|
rc = ocfs2_stack_driver_get(stack_name);
|
|
if (rc)
|
|
goto out_free;
|
|
|
|
rc = active_stack->sp_ops->connect(new_conn);
|
|
if (rc) {
|
|
ocfs2_stack_driver_put();
|
|
goto out_free;
|
|
}
|
|
|
|
*conn = new_conn;
|
|
|
|
out_free:
|
|
if (rc)
|
|
kfree(new_conn);
|
|
|
|
out:
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocfs2_cluster_connect);
|
|
|
|
/* The caller will ensure all nodes have the same cluster stack */
|
|
int ocfs2_cluster_connect_agnostic(const char *group,
|
|
int grouplen,
|
|
struct ocfs2_locking_protocol *lproto,
|
|
void (*recovery_handler)(int node_num,
|
|
void *recovery_data),
|
|
void *recovery_data,
|
|
struct ocfs2_cluster_connection **conn)
|
|
{
|
|
char *stack_name = NULL;
|
|
|
|
if (cluster_stack_name[0])
|
|
stack_name = cluster_stack_name;
|
|
return ocfs2_cluster_connect(stack_name, NULL, 0, group, grouplen,
|
|
lproto, recovery_handler, recovery_data,
|
|
conn);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocfs2_cluster_connect_agnostic);
|
|
|
|
/* If hangup_pending is 0, the stack driver will be dropped */
|
|
int ocfs2_cluster_disconnect(struct ocfs2_cluster_connection *conn,
|
|
int hangup_pending)
|
|
{
|
|
int ret;
|
|
|
|
BUG_ON(conn == NULL);
|
|
|
|
ret = active_stack->sp_ops->disconnect(conn);
|
|
|
|
/* XXX Should we free it anyway? */
|
|
if (!ret) {
|
|
kfree(conn);
|
|
if (!hangup_pending)
|
|
ocfs2_stack_driver_put();
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocfs2_cluster_disconnect);
|
|
|
|
/*
|
|
* Leave the group for this filesystem. This is executed by a userspace
|
|
* program (stored in ocfs2_hb_ctl_path).
|
|
*/
|
|
static void ocfs2_leave_group(const char *group)
|
|
{
|
|
int ret;
|
|
char *argv[5], *envp[3];
|
|
|
|
argv[0] = ocfs2_hb_ctl_path;
|
|
argv[1] = "-K";
|
|
argv[2] = "-u";
|
|
argv[3] = (char *)group;
|
|
argv[4] = NULL;
|
|
|
|
/* minimal command environment taken from cpu_run_sbin_hotplug */
|
|
envp[0] = "HOME=/";
|
|
envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
|
|
envp[2] = NULL;
|
|
|
|
ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
|
|
if (ret < 0) {
|
|
printk(KERN_ERR
|
|
"ocfs2: Error %d running user helper "
|
|
"\"%s %s %s %s\"\n",
|
|
ret, argv[0], argv[1], argv[2], argv[3]);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Hangup is a required post-umount. ocfs2-tools software expects the
|
|
* filesystem to call "ocfs2_hb_ctl" during unmount. This happens
|
|
* regardless of whether the DLM got started, so we can't do it
|
|
* in ocfs2_cluster_disconnect(). The ocfs2_leave_group() function does
|
|
* the actual work.
|
|
*/
|
|
void ocfs2_cluster_hangup(const char *group, int grouplen)
|
|
{
|
|
BUG_ON(group == NULL);
|
|
BUG_ON(group[grouplen] != '\0');
|
|
|
|
ocfs2_leave_group(group);
|
|
|
|
/* cluster_disconnect() was called with hangup_pending==1 */
|
|
ocfs2_stack_driver_put();
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocfs2_cluster_hangup);
|
|
|
|
int ocfs2_cluster_this_node(struct ocfs2_cluster_connection *conn,
|
|
unsigned int *node)
|
|
{
|
|
return active_stack->sp_ops->this_node(conn, node);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ocfs2_cluster_this_node);
|
|
|
|
|
|
/*
|
|
* Sysfs bits
|
|
*/
|
|
|
|
static ssize_t ocfs2_max_locking_protocol_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
char *buf)
|
|
{
|
|
ssize_t ret = 0;
|
|
|
|
spin_lock(&ocfs2_stack_lock);
|
|
if (locking_max_version.pv_major)
|
|
ret = snprintf(buf, PAGE_SIZE, "%u.%u\n",
|
|
locking_max_version.pv_major,
|
|
locking_max_version.pv_minor);
|
|
spin_unlock(&ocfs2_stack_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct kobj_attribute ocfs2_attr_max_locking_protocol =
|
|
__ATTR(max_locking_protocol, S_IRUGO,
|
|
ocfs2_max_locking_protocol_show, NULL);
|
|
|
|
static ssize_t ocfs2_loaded_cluster_plugins_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
char *buf)
|
|
{
|
|
ssize_t ret = 0, total = 0, remain = PAGE_SIZE;
|
|
struct ocfs2_stack_plugin *p;
|
|
|
|
spin_lock(&ocfs2_stack_lock);
|
|
list_for_each_entry(p, &ocfs2_stack_list, sp_list) {
|
|
ret = snprintf(buf, remain, "%s\n",
|
|
p->sp_name);
|
|
if (ret < 0) {
|
|
total = ret;
|
|
break;
|
|
}
|
|
if (ret == remain) {
|
|
/* snprintf() didn't fit */
|
|
total = -E2BIG;
|
|
break;
|
|
}
|
|
total += ret;
|
|
remain -= ret;
|
|
}
|
|
spin_unlock(&ocfs2_stack_lock);
|
|
|
|
return total;
|
|
}
|
|
|
|
static struct kobj_attribute ocfs2_attr_loaded_cluster_plugins =
|
|
__ATTR(loaded_cluster_plugins, S_IRUGO,
|
|
ocfs2_loaded_cluster_plugins_show, NULL);
|
|
|
|
static ssize_t ocfs2_active_cluster_plugin_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
char *buf)
|
|
{
|
|
ssize_t ret = 0;
|
|
|
|
spin_lock(&ocfs2_stack_lock);
|
|
if (active_stack) {
|
|
ret = snprintf(buf, PAGE_SIZE, "%s\n",
|
|
active_stack->sp_name);
|
|
if (ret == PAGE_SIZE)
|
|
ret = -E2BIG;
|
|
}
|
|
spin_unlock(&ocfs2_stack_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct kobj_attribute ocfs2_attr_active_cluster_plugin =
|
|
__ATTR(active_cluster_plugin, S_IRUGO,
|
|
ocfs2_active_cluster_plugin_show, NULL);
|
|
|
|
static ssize_t ocfs2_cluster_stack_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
char *buf)
|
|
{
|
|
ssize_t ret;
|
|
spin_lock(&ocfs2_stack_lock);
|
|
ret = snprintf(buf, PAGE_SIZE, "%s\n", cluster_stack_name);
|
|
spin_unlock(&ocfs2_stack_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t ocfs2_cluster_stack_store(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
size_t len = count;
|
|
ssize_t ret;
|
|
|
|
if (len == 0)
|
|
return len;
|
|
|
|
if (buf[len - 1] == '\n')
|
|
len--;
|
|
|
|
if ((len != OCFS2_STACK_LABEL_LEN) ||
|
|
(strnlen(buf, len) != len))
|
|
return -EINVAL;
|
|
|
|
spin_lock(&ocfs2_stack_lock);
|
|
if (active_stack) {
|
|
if (!strncmp(buf, cluster_stack_name, len))
|
|
ret = count;
|
|
else
|
|
ret = -EBUSY;
|
|
} else {
|
|
memcpy(cluster_stack_name, buf, len);
|
|
ret = count;
|
|
}
|
|
spin_unlock(&ocfs2_stack_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
static struct kobj_attribute ocfs2_attr_cluster_stack =
|
|
__ATTR(cluster_stack, S_IRUGO | S_IWUSR,
|
|
ocfs2_cluster_stack_show,
|
|
ocfs2_cluster_stack_store);
|
|
|
|
|
|
|
|
static ssize_t ocfs2_dlm_recover_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return snprintf(buf, PAGE_SIZE, "1\n");
|
|
}
|
|
|
|
static struct kobj_attribute ocfs2_attr_dlm_recover_support =
|
|
__ATTR(dlm_recover_callback_support, S_IRUGO,
|
|
ocfs2_dlm_recover_show, NULL);
|
|
|
|
static struct attribute *ocfs2_attrs[] = {
|
|
&ocfs2_attr_max_locking_protocol.attr,
|
|
&ocfs2_attr_loaded_cluster_plugins.attr,
|
|
&ocfs2_attr_active_cluster_plugin.attr,
|
|
&ocfs2_attr_cluster_stack.attr,
|
|
&ocfs2_attr_dlm_recover_support.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group ocfs2_attr_group = {
|
|
.attrs = ocfs2_attrs,
|
|
};
|
|
|
|
struct kset *ocfs2_kset;
|
|
EXPORT_SYMBOL_GPL(ocfs2_kset);
|
|
|
|
static void ocfs2_sysfs_exit(void)
|
|
{
|
|
kset_unregister(ocfs2_kset);
|
|
}
|
|
|
|
static int ocfs2_sysfs_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ocfs2_kset = kset_create_and_add("ocfs2", NULL, fs_kobj);
|
|
if (!ocfs2_kset)
|
|
return -ENOMEM;
|
|
|
|
ret = sysfs_create_group(&ocfs2_kset->kobj, &ocfs2_attr_group);
|
|
if (ret)
|
|
goto error;
|
|
|
|
return 0;
|
|
|
|
error:
|
|
kset_unregister(ocfs2_kset);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Sysctl bits
|
|
*
|
|
* The sysctl lives at /proc/sys/fs/ocfs2/nm/hb_ctl_path. The 'nm' doesn't
|
|
* make as much sense in a multiple cluster stack world, but it's safer
|
|
* and easier to preserve the name.
|
|
*/
|
|
|
|
#define FS_OCFS2_NM 1
|
|
|
|
static struct ctl_table ocfs2_nm_table[] = {
|
|
{
|
|
.procname = "hb_ctl_path",
|
|
.data = ocfs2_hb_ctl_path,
|
|
.maxlen = OCFS2_MAX_HB_CTL_PATH,
|
|
.mode = 0644,
|
|
.proc_handler = proc_dostring,
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static struct ctl_table ocfs2_mod_table[] = {
|
|
{
|
|
.procname = "nm",
|
|
.data = NULL,
|
|
.maxlen = 0,
|
|
.mode = 0555,
|
|
.child = ocfs2_nm_table
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static struct ctl_table ocfs2_kern_table[] = {
|
|
{
|
|
.procname = "ocfs2",
|
|
.data = NULL,
|
|
.maxlen = 0,
|
|
.mode = 0555,
|
|
.child = ocfs2_mod_table
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static struct ctl_table ocfs2_root_table[] = {
|
|
{
|
|
.procname = "fs",
|
|
.data = NULL,
|
|
.maxlen = 0,
|
|
.mode = 0555,
|
|
.child = ocfs2_kern_table
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static struct ctl_table_header *ocfs2_table_header;
|
|
|
|
|
|
/*
|
|
* Initialization
|
|
*/
|
|
|
|
static int __init ocfs2_stack_glue_init(void)
|
|
{
|
|
strcpy(cluster_stack_name, OCFS2_STACK_PLUGIN_O2CB);
|
|
|
|
ocfs2_table_header = register_sysctl_table(ocfs2_root_table);
|
|
if (!ocfs2_table_header) {
|
|
printk(KERN_ERR
|
|
"ocfs2 stack glue: unable to register sysctl\n");
|
|
return -ENOMEM; /* or something. */
|
|
}
|
|
|
|
return ocfs2_sysfs_init();
|
|
}
|
|
|
|
static void __exit ocfs2_stack_glue_exit(void)
|
|
{
|
|
memset(&locking_max_version, 0,
|
|
sizeof(struct ocfs2_protocol_version));
|
|
ocfs2_sysfs_exit();
|
|
if (ocfs2_table_header)
|
|
unregister_sysctl_table(ocfs2_table_header);
|
|
}
|
|
|
|
MODULE_AUTHOR("Oracle");
|
|
MODULE_DESCRIPTION("ocfs2 cluter stack glue layer");
|
|
MODULE_LICENSE("GPL");
|
|
module_init(ocfs2_stack_glue_init);
|
|
module_exit(ocfs2_stack_glue_exit);
|