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linux-sg2042/fs/dlm/config.c

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/******************************************************************************
*******************************************************************************
**
** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
** Copyright (C) 2004-2011 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/kernel.h>
#include <linux/module.h>
#include <linux/configfs.h>
#include <linux/slab.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/dlmconstants.h>
#include <net/ipv6.h>
#include <net/sock.h>
#include "config.h"
#include "lowcomms.h"
/*
* /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid
* /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
* /config/dlm/<cluster>/comms/<comm>/nodeid
* /config/dlm/<cluster>/comms/<comm>/local
* /config/dlm/<cluster>/comms/<comm>/addr (write only)
* /config/dlm/<cluster>/comms/<comm>/addr_list (read only)
* The <cluster> level is useless, but I haven't figured out how to avoid it.
*/
static struct config_group *space_list;
static struct config_group *comm_list;
static struct dlm_comm *local_comm;
static uint32_t dlm_comm_count;
struct dlm_clusters;
struct dlm_cluster;
struct dlm_spaces;
struct dlm_space;
struct dlm_comms;
struct dlm_comm;
struct dlm_nodes;
struct dlm_node;
static struct config_group *make_cluster(struct config_group *, const char *);
static void drop_cluster(struct config_group *, struct config_item *);
static void release_cluster(struct config_item *);
static struct config_group *make_space(struct config_group *, const char *);
static void drop_space(struct config_group *, struct config_item *);
static void release_space(struct config_item *);
static struct config_item *make_comm(struct config_group *, const char *);
static void drop_comm(struct config_group *, struct config_item *);
static void release_comm(struct config_item *);
static struct config_item *make_node(struct config_group *, const char *);
static void drop_node(struct config_group *, struct config_item *);
static void release_node(struct config_item *);
static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
char *buf);
static ssize_t store_cluster(struct config_item *i,
struct configfs_attribute *a,
const char *buf, size_t len);
static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
char *buf);
static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
const char *buf, size_t len);
static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
char *buf);
static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
const char *buf, size_t len);
static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf);
static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
size_t len);
static ssize_t comm_local_read(struct dlm_comm *cm, char *buf);
static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
size_t len);
static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf,
size_t len);
static ssize_t comm_addr_list_read(struct dlm_comm *cm, char *buf);
static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf);
static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
size_t len);
static ssize_t node_weight_read(struct dlm_node *nd, char *buf);
static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
size_t len);
struct dlm_cluster {
struct config_group group;
unsigned int cl_tcp_port;
unsigned int cl_buffer_size;
unsigned int cl_rsbtbl_size;
unsigned int cl_recover_timer;
unsigned int cl_toss_secs;
unsigned int cl_scan_secs;
unsigned int cl_log_debug;
unsigned int cl_protocol;
unsigned int cl_timewarn_cs;
unsigned int cl_waitwarn_us;
unsigned int cl_new_rsb_count;
unsigned int cl_recover_callbacks;
char cl_cluster_name[DLM_LOCKSPACE_LEN];
};
enum {
CLUSTER_ATTR_TCP_PORT = 0,
CLUSTER_ATTR_BUFFER_SIZE,
CLUSTER_ATTR_RSBTBL_SIZE,
CLUSTER_ATTR_RECOVER_TIMER,
CLUSTER_ATTR_TOSS_SECS,
CLUSTER_ATTR_SCAN_SECS,
CLUSTER_ATTR_LOG_DEBUG,
CLUSTER_ATTR_PROTOCOL,
CLUSTER_ATTR_TIMEWARN_CS,
CLUSTER_ATTR_WAITWARN_US,
CLUSTER_ATTR_NEW_RSB_COUNT,
CLUSTER_ATTR_RECOVER_CALLBACKS,
CLUSTER_ATTR_CLUSTER_NAME,
};
struct cluster_attribute {
struct configfs_attribute attr;
ssize_t (*show)(struct dlm_cluster *, char *);
ssize_t (*store)(struct dlm_cluster *, const char *, size_t);
};
static ssize_t cluster_cluster_name_read(struct dlm_cluster *cl, char *buf)
{
return sprintf(buf, "%s\n", cl->cl_cluster_name);
}
static ssize_t cluster_cluster_name_write(struct dlm_cluster *cl,
const char *buf, size_t len)
{
strncpy(dlm_config.ci_cluster_name, buf, DLM_LOCKSPACE_LEN);
strncpy(cl->cl_cluster_name, buf, DLM_LOCKSPACE_LEN);
return len;
}
static struct cluster_attribute cluster_attr_cluster_name = {
.attr = { .ca_owner = THIS_MODULE,
.ca_name = "cluster_name",
.ca_mode = S_IRUGO | S_IWUSR },
.show = cluster_cluster_name_read,
.store = cluster_cluster_name_write,
};
static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
int *info_field, int check_zero,
const char *buf, size_t len)
{
unsigned int x;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
x = simple_strtoul(buf, NULL, 0);
if (check_zero && !x)
return -EINVAL;
*cl_field = x;
*info_field = x;
return len;
}
#define CLUSTER_ATTR(name, check_zero) \
static ssize_t name##_write(struct dlm_cluster *cl, const char *buf, size_t len) \
{ \
return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name, \
check_zero, buf, len); \
} \
static ssize_t name##_read(struct dlm_cluster *cl, char *buf) \
{ \
return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name); \
} \
static struct cluster_attribute cluster_attr_##name = \
__CONFIGFS_ATTR(name, 0644, name##_read, name##_write)
CLUSTER_ATTR(tcp_port, 1);
CLUSTER_ATTR(buffer_size, 1);
CLUSTER_ATTR(rsbtbl_size, 1);
CLUSTER_ATTR(recover_timer, 1);
CLUSTER_ATTR(toss_secs, 1);
CLUSTER_ATTR(scan_secs, 1);
CLUSTER_ATTR(log_debug, 0);
CLUSTER_ATTR(protocol, 0);
CLUSTER_ATTR(timewarn_cs, 1);
CLUSTER_ATTR(waitwarn_us, 0);
CLUSTER_ATTR(new_rsb_count, 0);
CLUSTER_ATTR(recover_callbacks, 0);
static struct configfs_attribute *cluster_attrs[] = {
[CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port.attr,
[CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size.attr,
[CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size.attr,
[CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer.attr,
[CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs.attr,
[CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs.attr,
[CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug.attr,
[CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol.attr,
[CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs.attr,
[CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us.attr,
[CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count.attr,
[CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks.attr,
[CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name.attr,
NULL,
};
enum {
COMM_ATTR_NODEID = 0,
COMM_ATTR_LOCAL,
COMM_ATTR_ADDR,
COMM_ATTR_ADDR_LIST,
};
struct comm_attribute {
struct configfs_attribute attr;
ssize_t (*show)(struct dlm_comm *, char *);
ssize_t (*store)(struct dlm_comm *, const char *, size_t);
};
static struct comm_attribute comm_attr_nodeid = {
.attr = { .ca_owner = THIS_MODULE,
.ca_name = "nodeid",
.ca_mode = S_IRUGO | S_IWUSR },
.show = comm_nodeid_read,
.store = comm_nodeid_write,
};
static struct comm_attribute comm_attr_local = {
.attr = { .ca_owner = THIS_MODULE,
.ca_name = "local",
.ca_mode = S_IRUGO | S_IWUSR },
.show = comm_local_read,
.store = comm_local_write,
};
static struct comm_attribute comm_attr_addr = {
.attr = { .ca_owner = THIS_MODULE,
.ca_name = "addr",
.ca_mode = S_IWUSR },
.store = comm_addr_write,
};
static struct comm_attribute comm_attr_addr_list = {
.attr = { .ca_owner = THIS_MODULE,
.ca_name = "addr_list",
.ca_mode = S_IRUGO },
.show = comm_addr_list_read,
};
static struct configfs_attribute *comm_attrs[] = {
[COMM_ATTR_NODEID] = &comm_attr_nodeid.attr,
[COMM_ATTR_LOCAL] = &comm_attr_local.attr,
[COMM_ATTR_ADDR] = &comm_attr_addr.attr,
[COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list.attr,
NULL,
};
enum {
NODE_ATTR_NODEID = 0,
NODE_ATTR_WEIGHT,
};
struct node_attribute {
struct configfs_attribute attr;
ssize_t (*show)(struct dlm_node *, char *);
ssize_t (*store)(struct dlm_node *, const char *, size_t);
};
static struct node_attribute node_attr_nodeid = {
.attr = { .ca_owner = THIS_MODULE,
.ca_name = "nodeid",
.ca_mode = S_IRUGO | S_IWUSR },
.show = node_nodeid_read,
.store = node_nodeid_write,
};
static struct node_attribute node_attr_weight = {
.attr = { .ca_owner = THIS_MODULE,
.ca_name = "weight",
.ca_mode = S_IRUGO | S_IWUSR },
.show = node_weight_read,
.store = node_weight_write,
};
static struct configfs_attribute *node_attrs[] = {
[NODE_ATTR_NODEID] = &node_attr_nodeid.attr,
[NODE_ATTR_WEIGHT] = &node_attr_weight.attr,
NULL,
};
struct dlm_clusters {
struct configfs_subsystem subsys;
};
struct dlm_spaces {
struct config_group ss_group;
};
struct dlm_space {
struct config_group group;
struct list_head members;
struct mutex members_lock;
int members_count;
};
struct dlm_comms {
struct config_group cs_group;
};
struct dlm_comm {
struct config_item item;
int seq;
int nodeid;
int local;
int addr_count;
struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
};
struct dlm_nodes {
struct config_group ns_group;
};
struct dlm_node {
struct config_item item;
struct list_head list; /* space->members */
int nodeid;
int weight;
int new;
int comm_seq; /* copy of cm->seq when nd->nodeid is set */
};
static struct configfs_group_operations clusters_ops = {
.make_group = make_cluster,
.drop_item = drop_cluster,
};
static struct configfs_item_operations cluster_ops = {
.release = release_cluster,
.show_attribute = show_cluster,
.store_attribute = store_cluster,
};
static struct configfs_group_operations spaces_ops = {
.make_group = make_space,
.drop_item = drop_space,
};
static struct configfs_item_operations space_ops = {
.release = release_space,
};
static struct configfs_group_operations comms_ops = {
.make_item = make_comm,
.drop_item = drop_comm,
};
static struct configfs_item_operations comm_ops = {
.release = release_comm,
.show_attribute = show_comm,
.store_attribute = store_comm,
};
static struct configfs_group_operations nodes_ops = {
.make_item = make_node,
.drop_item = drop_node,
};
static struct configfs_item_operations node_ops = {
.release = release_node,
.show_attribute = show_node,
.store_attribute = store_node,
};
static struct config_item_type clusters_type = {
.ct_group_ops = &clusters_ops,
.ct_owner = THIS_MODULE,
};
static struct config_item_type cluster_type = {
.ct_item_ops = &cluster_ops,
.ct_attrs = cluster_attrs,
.ct_owner = THIS_MODULE,
};
static struct config_item_type spaces_type = {
.ct_group_ops = &spaces_ops,
.ct_owner = THIS_MODULE,
};
static struct config_item_type space_type = {
.ct_item_ops = &space_ops,
.ct_owner = THIS_MODULE,
};
static struct config_item_type comms_type = {
.ct_group_ops = &comms_ops,
.ct_owner = THIS_MODULE,
};
static struct config_item_type comm_type = {
.ct_item_ops = &comm_ops,
.ct_attrs = comm_attrs,
.ct_owner = THIS_MODULE,
};
static struct config_item_type nodes_type = {
.ct_group_ops = &nodes_ops,
.ct_owner = THIS_MODULE,
};
static struct config_item_type node_type = {
.ct_item_ops = &node_ops,
.ct_attrs = node_attrs,
.ct_owner = THIS_MODULE,
};
static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
{
return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
NULL;
}
static struct dlm_space *config_item_to_space(struct config_item *i)
{
return i ? container_of(to_config_group(i), struct dlm_space, group) :
NULL;
}
static struct dlm_comm *config_item_to_comm(struct config_item *i)
{
return i ? container_of(i, struct dlm_comm, item) : NULL;
}
static struct dlm_node *config_item_to_node(struct config_item *i)
{
return i ? container_of(i, struct dlm_node, item) : NULL;
}
static struct config_group *make_cluster(struct config_group *g,
const char *name)
{
struct dlm_cluster *cl = NULL;
struct dlm_spaces *sps = NULL;
struct dlm_comms *cms = NULL;
void *gps = NULL;
cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
gps = kcalloc(3, sizeof(struct config_group *), GFP_NOFS);
sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
if (!cl || !gps || !sps || !cms)
goto fail;
config_group_init_type_name(&cl->group, name, &cluster_type);
config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
cl->group.default_groups = gps;
cl->group.default_groups[0] = &sps->ss_group;
cl->group.default_groups[1] = &cms->cs_group;
cl->group.default_groups[2] = NULL;
cl->cl_tcp_port = dlm_config.ci_tcp_port;
cl->cl_buffer_size = dlm_config.ci_buffer_size;
cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
cl->cl_recover_timer = dlm_config.ci_recover_timer;
cl->cl_toss_secs = dlm_config.ci_toss_secs;
cl->cl_scan_secs = dlm_config.ci_scan_secs;
cl->cl_log_debug = dlm_config.ci_log_debug;
cl->cl_protocol = dlm_config.ci_protocol;
cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
DLM_LOCKSPACE_LEN);
space_list = &sps->ss_group;
comm_list = &cms->cs_group;
return &cl->group;
fail:
kfree(cl);
kfree(gps);
kfree(sps);
kfree(cms);
return ERR_PTR(-ENOMEM);
}
static void drop_cluster(struct config_group *g, struct config_item *i)
{
struct dlm_cluster *cl = config_item_to_cluster(i);
struct config_item *tmp;
int j;
for (j = 0; cl->group.default_groups[j]; j++) {
tmp = &cl->group.default_groups[j]->cg_item;
cl->group.default_groups[j] = NULL;
config_item_put(tmp);
}
space_list = NULL;
comm_list = NULL;
config_item_put(i);
}
static void release_cluster(struct config_item *i)
{
struct dlm_cluster *cl = config_item_to_cluster(i);
kfree(cl->group.default_groups);
kfree(cl);
}
static struct config_group *make_space(struct config_group *g, const char *name)
{
struct dlm_space *sp = NULL;
struct dlm_nodes *nds = NULL;
void *gps = NULL;
sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
gps = kcalloc(2, sizeof(struct config_group *), GFP_NOFS);
nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
if (!sp || !gps || !nds)
goto fail;
config_group_init_type_name(&sp->group, name, &space_type);
config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
sp->group.default_groups = gps;
sp->group.default_groups[0] = &nds->ns_group;
sp->group.default_groups[1] = NULL;
INIT_LIST_HEAD(&sp->members);
mutex_init(&sp->members_lock);
sp->members_count = 0;
return &sp->group;
fail:
kfree(sp);
kfree(gps);
kfree(nds);
return ERR_PTR(-ENOMEM);
}
static void drop_space(struct config_group *g, struct config_item *i)
{
struct dlm_space *sp = config_item_to_space(i);
struct config_item *tmp;
int j;
/* assert list_empty(&sp->members) */
for (j = 0; sp->group.default_groups[j]; j++) {
tmp = &sp->group.default_groups[j]->cg_item;
sp->group.default_groups[j] = NULL;
config_item_put(tmp);
}
config_item_put(i);
}
static void release_space(struct config_item *i)
{
struct dlm_space *sp = config_item_to_space(i);
kfree(sp->group.default_groups);
kfree(sp);
}
static struct config_item *make_comm(struct config_group *g, const char *name)
{
struct dlm_comm *cm;
cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
if (!cm)
return ERR_PTR(-ENOMEM);
config_item_init_type_name(&cm->item, name, &comm_type);
cm->seq = dlm_comm_count++;
if (!cm->seq)
cm->seq = dlm_comm_count++;
cm->nodeid = -1;
cm->local = 0;
cm->addr_count = 0;
return &cm->item;
}
static void drop_comm(struct config_group *g, struct config_item *i)
{
struct dlm_comm *cm = config_item_to_comm(i);
if (local_comm == cm)
local_comm = NULL;
dlm_lowcomms_close(cm->nodeid);
while (cm->addr_count--)
kfree(cm->addr[cm->addr_count]);
config_item_put(i);
}
static void release_comm(struct config_item *i)
{
struct dlm_comm *cm = config_item_to_comm(i);
kfree(cm);
}
static struct config_item *make_node(struct config_group *g, const char *name)
{
struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
struct dlm_node *nd;
nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
if (!nd)
return ERR_PTR(-ENOMEM);
config_item_init_type_name(&nd->item, name, &node_type);
nd->nodeid = -1;
nd->weight = 1; /* default weight of 1 if none is set */
nd->new = 1; /* set to 0 once it's been read by dlm_nodeid_list() */
mutex_lock(&sp->members_lock);
list_add(&nd->list, &sp->members);
sp->members_count++;
mutex_unlock(&sp->members_lock);
return &nd->item;
}
static void drop_node(struct config_group *g, struct config_item *i)
{
struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
struct dlm_node *nd = config_item_to_node(i);
mutex_lock(&sp->members_lock);
list_del(&nd->list);
sp->members_count--;
mutex_unlock(&sp->members_lock);
config_item_put(i);
}
static void release_node(struct config_item *i)
{
struct dlm_node *nd = config_item_to_node(i);
kfree(nd);
}
static struct dlm_clusters clusters_root = {
.subsys = {
.su_group = {
.cg_item = {
.ci_namebuf = "dlm",
.ci_type = &clusters_type,
},
},
},
};
int __init dlm_config_init(void)
{
config_group_init(&clusters_root.subsys.su_group);
mutex_init(&clusters_root.subsys.su_mutex);
return configfs_register_subsystem(&clusters_root.subsys);
}
void dlm_config_exit(void)
{
configfs_unregister_subsystem(&clusters_root.subsys);
}
/*
* Functions for user space to read/write attributes
*/
static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
char *buf)
{
struct dlm_cluster *cl = config_item_to_cluster(i);
struct cluster_attribute *cla =
container_of(a, struct cluster_attribute, attr);
return cla->show ? cla->show(cl, buf) : 0;
}
static ssize_t store_cluster(struct config_item *i,
struct configfs_attribute *a,
const char *buf, size_t len)
{
struct dlm_cluster *cl = config_item_to_cluster(i);
struct cluster_attribute *cla =
container_of(a, struct cluster_attribute, attr);
return cla->store ? cla->store(cl, buf, len) : -EINVAL;
}
static ssize_t show_comm(struct config_item *i, struct configfs_attribute *a,
char *buf)
{
struct dlm_comm *cm = config_item_to_comm(i);
struct comm_attribute *cma =
container_of(a, struct comm_attribute, attr);
return cma->show ? cma->show(cm, buf) : 0;
}
static ssize_t store_comm(struct config_item *i, struct configfs_attribute *a,
const char *buf, size_t len)
{
struct dlm_comm *cm = config_item_to_comm(i);
struct comm_attribute *cma =
container_of(a, struct comm_attribute, attr);
return cma->store ? cma->store(cm, buf, len) : -EINVAL;
}
static ssize_t comm_nodeid_read(struct dlm_comm *cm, char *buf)
{
return sprintf(buf, "%d\n", cm->nodeid);
}
static ssize_t comm_nodeid_write(struct dlm_comm *cm, const char *buf,
size_t len)
{
cm->nodeid = simple_strtol(buf, NULL, 0);
return len;
}
static ssize_t comm_local_read(struct dlm_comm *cm, char *buf)
{
return sprintf(buf, "%d\n", cm->local);
}
static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
size_t len)
{
cm->local= simple_strtol(buf, NULL, 0);
if (cm->local && !local_comm)
local_comm = cm;
return len;
}
static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf, size_t len)
{
struct sockaddr_storage *addr;
int rv;
if (len != sizeof(struct sockaddr_storage))
return -EINVAL;
if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
return -ENOSPC;
addr = kzalloc(sizeof(*addr), GFP_NOFS);
if (!addr)
return -ENOMEM;
memcpy(addr, buf, len);
rv = dlm_lowcomms_addr(cm->nodeid, addr, len);
if (rv) {
kfree(addr);
return rv;
}
cm->addr[cm->addr_count++] = addr;
return len;
}
static ssize_t comm_addr_list_read(struct dlm_comm *cm, char *buf)
{
ssize_t s;
ssize_t allowance;
int i;
struct sockaddr_storage *addr;
struct sockaddr_in *addr_in;
struct sockaddr_in6 *addr_in6;
/* Taken from ip6_addr_string() defined in lib/vsprintf.c */
char buf0[sizeof("AF_INET6 xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
/* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
allowance = 4096;
buf[0] = '\0';
for (i = 0; i < cm->addr_count; i++) {
addr = cm->addr[i];
switch(addr->ss_family) {
case AF_INET:
addr_in = (struct sockaddr_in *)addr;
s = sprintf(buf0, "AF_INET %pI4\n", &addr_in->sin_addr.s_addr);
break;
case AF_INET6:
addr_in6 = (struct sockaddr_in6 *)addr;
s = sprintf(buf0, "AF_INET6 %pI6\n", &addr_in6->sin6_addr);
break;
default:
s = sprintf(buf0, "%s\n", "<UNKNOWN>");
break;
}
allowance -= s;
if (allowance >= 0)
strcat(buf, buf0);
else {
allowance += s;
break;
}
}
return 4096 - allowance;
}
static ssize_t show_node(struct config_item *i, struct configfs_attribute *a,
char *buf)
{
struct dlm_node *nd = config_item_to_node(i);
struct node_attribute *nda =
container_of(a, struct node_attribute, attr);
return nda->show ? nda->show(nd, buf) : 0;
}
static ssize_t store_node(struct config_item *i, struct configfs_attribute *a,
const char *buf, size_t len)
{
struct dlm_node *nd = config_item_to_node(i);
struct node_attribute *nda =
container_of(a, struct node_attribute, attr);
return nda->store ? nda->store(nd, buf, len) : -EINVAL;
}
static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf)
{
return sprintf(buf, "%d\n", nd->nodeid);
}
static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
size_t len)
{
uint32_t seq = 0;
nd->nodeid = simple_strtol(buf, NULL, 0);
dlm_comm_seq(nd->nodeid, &seq);
nd->comm_seq = seq;
return len;
}
static ssize_t node_weight_read(struct dlm_node *nd, char *buf)
{
return sprintf(buf, "%d\n", nd->weight);
}
static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
size_t len)
{
nd->weight = simple_strtol(buf, NULL, 0);
return len;
}
/*
* Functions for the dlm to get the info that's been configured
*/
static struct dlm_space *get_space(char *name)
{
struct config_item *i;
if (!space_list)
return NULL;
mutex_lock(&space_list->cg_subsys->su_mutex);
i = config_group_find_item(space_list, name);
mutex_unlock(&space_list->cg_subsys->su_mutex);
return config_item_to_space(i);
}
static void put_space(struct dlm_space *sp)
{
config_item_put(&sp->group.cg_item);
}
static struct dlm_comm *get_comm(int nodeid)
{
struct config_item *i;
struct dlm_comm *cm = NULL;
int found = 0;
if (!comm_list)
return NULL;
mutex_lock(&clusters_root.subsys.su_mutex);
list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
cm = config_item_to_comm(i);
if (cm->nodeid != nodeid)
continue;
found = 1;
config_item_get(i);
break;
}
mutex_unlock(&clusters_root.subsys.su_mutex);
if (!found)
cm = NULL;
return cm;
}
static void put_comm(struct dlm_comm *cm)
{
config_item_put(&cm->item);
}
/* caller must free mem */
int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
int *count_out)
{
struct dlm_space *sp;
struct dlm_node *nd;
struct dlm_config_node *nodes, *node;
int rv, count;
sp = get_space(lsname);
if (!sp)
return -EEXIST;
mutex_lock(&sp->members_lock);
if (!sp->members_count) {
rv = -EINVAL;
printk(KERN_ERR "dlm: zero members_count\n");
goto out;
}
count = sp->members_count;
nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
if (!nodes) {
rv = -ENOMEM;
goto out;
}
node = nodes;
list_for_each_entry(nd, &sp->members, list) {
node->nodeid = nd->nodeid;
node->weight = nd->weight;
node->new = nd->new;
node->comm_seq = nd->comm_seq;
node++;
nd->new = 0;
}
*count_out = count;
*nodes_out = nodes;
rv = 0;
out:
mutex_unlock(&sp->members_lock);
put_space(sp);
return rv;
}
int dlm_comm_seq(int nodeid, uint32_t *seq)
{
struct dlm_comm *cm = get_comm(nodeid);
if (!cm)
return -EEXIST;
*seq = cm->seq;
put_comm(cm);
return 0;
}
int dlm_our_nodeid(void)
{
return local_comm ? local_comm->nodeid : 0;
}
/* num 0 is first addr, num 1 is second addr */
int dlm_our_addr(struct sockaddr_storage *addr, int num)
{
if (!local_comm)
return -1;
if (num + 1 > local_comm->addr_count)
return -1;
memcpy(addr, local_comm->addr[num], sizeof(*addr));
return 0;
}
/* Config file defaults */
#define DEFAULT_TCP_PORT 21064
#define DEFAULT_BUFFER_SIZE 4096
#define DEFAULT_RSBTBL_SIZE 1024
#define DEFAULT_RECOVER_TIMER 5
#define DEFAULT_TOSS_SECS 10
#define DEFAULT_SCAN_SECS 5
#define DEFAULT_LOG_DEBUG 0
#define DEFAULT_PROTOCOL 0
#define DEFAULT_TIMEWARN_CS 500 /* 5 sec = 500 centiseconds */
#define DEFAULT_WAITWARN_US 0
#define DEFAULT_NEW_RSB_COUNT 128
#define DEFAULT_RECOVER_CALLBACKS 0
#define DEFAULT_CLUSTER_NAME ""
struct dlm_config_info dlm_config = {
.ci_tcp_port = DEFAULT_TCP_PORT,
.ci_buffer_size = DEFAULT_BUFFER_SIZE,
.ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
.ci_recover_timer = DEFAULT_RECOVER_TIMER,
.ci_toss_secs = DEFAULT_TOSS_SECS,
.ci_scan_secs = DEFAULT_SCAN_SECS,
.ci_log_debug = DEFAULT_LOG_DEBUG,
.ci_protocol = DEFAULT_PROTOCOL,
.ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
.ci_waitwarn_us = DEFAULT_WAITWARN_US,
.ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
.ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
.ci_cluster_name = DEFAULT_CLUSTER_NAME
};
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