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-rw-r--r--fs/dlm/config.c987
1 files changed, 987 insertions, 0 deletions
diff --git a/fs/dlm/config.c b/fs/dlm/config.c
new file mode 100644
index 000000000..ac8b62106
--- /dev/null
+++ b/fs/dlm/config.c
@@ -0,0 +1,987 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/******************************************************************************
+*******************************************************************************
+**
+** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+** Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
+**
+**
+*******************************************************************************
+******************************************************************************/
+
+#include <linux/kernel.h>
+#include <linux/init.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 "midcomms.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 struct configfs_attribute *comm_attrs[];
+static struct configfs_attribute *node_attrs[];
+
+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_log_info;
+ unsigned int cl_protocol;
+ unsigned int cl_mark;
+#ifdef CONFIG_DLM_DEPRECATED_API
+ unsigned int cl_timewarn_cs;
+#endif
+ unsigned int cl_new_rsb_count;
+ unsigned int cl_recover_callbacks;
+ char cl_cluster_name[DLM_LOCKSPACE_LEN];
+
+ struct dlm_spaces *sps;
+ struct dlm_comms *cms;
+};
+
+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;
+}
+
+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_LOG_INFO,
+ CLUSTER_ATTR_PROTOCOL,
+ CLUSTER_ATTR_MARK,
+#ifdef CONFIG_DLM_DEPRECATED_API
+ CLUSTER_ATTR_TIMEWARN_CS,
+#endif
+ CLUSTER_ATTR_NEW_RSB_COUNT,
+ CLUSTER_ATTR_RECOVER_CALLBACKS,
+ CLUSTER_ATTR_CLUSTER_NAME,
+};
+
+static ssize_t cluster_cluster_name_show(struct config_item *item, char *buf)
+{
+ struct dlm_cluster *cl = config_item_to_cluster(item);
+ return sprintf(buf, "%s\n", cl->cl_cluster_name);
+}
+
+static ssize_t cluster_cluster_name_store(struct config_item *item,
+ const char *buf, size_t len)
+{
+ struct dlm_cluster *cl = config_item_to_cluster(item);
+
+ strlcpy(dlm_config.ci_cluster_name, buf,
+ sizeof(dlm_config.ci_cluster_name));
+ strlcpy(cl->cl_cluster_name, buf, sizeof(cl->cl_cluster_name));
+ return len;
+}
+
+CONFIGFS_ATTR(cluster_, cluster_name);
+
+static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
+ int *info_field, int (*check_cb)(unsigned int x),
+ const char *buf, size_t len)
+{
+ unsigned int x;
+ int rc;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ rc = kstrtouint(buf, 0, &x);
+ if (rc)
+ return rc;
+
+ if (check_cb) {
+ rc = check_cb(x);
+ if (rc)
+ return rc;
+ }
+
+ *cl_field = x;
+ *info_field = x;
+
+ return len;
+}
+
+#define CLUSTER_ATTR(name, check_cb) \
+static ssize_t cluster_##name##_store(struct config_item *item, \
+ const char *buf, size_t len) \
+{ \
+ struct dlm_cluster *cl = config_item_to_cluster(item); \
+ return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name, \
+ check_cb, buf, len); \
+} \
+static ssize_t cluster_##name##_show(struct config_item *item, char *buf) \
+{ \
+ struct dlm_cluster *cl = config_item_to_cluster(item); \
+ return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name); \
+} \
+CONFIGFS_ATTR(cluster_, name);
+
+static int dlm_check_protocol_and_dlm_running(unsigned int x)
+{
+ switch (x) {
+ case 0:
+ /* TCP */
+ break;
+ case 1:
+ /* SCTP */
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (dlm_allow_conn)
+ return -EBUSY;
+
+ return 0;
+}
+
+static int dlm_check_zero_and_dlm_running(unsigned int x)
+{
+ if (!x)
+ return -EINVAL;
+
+ if (dlm_allow_conn)
+ return -EBUSY;
+
+ return 0;
+}
+
+static int dlm_check_zero(unsigned int x)
+{
+ if (!x)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int dlm_check_buffer_size(unsigned int x)
+{
+ if (x < DLM_MAX_SOCKET_BUFSIZE)
+ return -EINVAL;
+
+ return 0;
+}
+
+CLUSTER_ATTR(tcp_port, dlm_check_zero_and_dlm_running);
+CLUSTER_ATTR(buffer_size, dlm_check_buffer_size);
+CLUSTER_ATTR(rsbtbl_size, dlm_check_zero);
+CLUSTER_ATTR(recover_timer, dlm_check_zero);
+CLUSTER_ATTR(toss_secs, dlm_check_zero);
+CLUSTER_ATTR(scan_secs, dlm_check_zero);
+CLUSTER_ATTR(log_debug, NULL);
+CLUSTER_ATTR(log_info, NULL);
+CLUSTER_ATTR(protocol, dlm_check_protocol_and_dlm_running);
+CLUSTER_ATTR(mark, NULL);
+#ifdef CONFIG_DLM_DEPRECATED_API
+CLUSTER_ATTR(timewarn_cs, dlm_check_zero);
+#endif
+CLUSTER_ATTR(new_rsb_count, NULL);
+CLUSTER_ATTR(recover_callbacks, NULL);
+
+static struct configfs_attribute *cluster_attrs[] = {
+ [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port,
+ [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size,
+ [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size,
+ [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer,
+ [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs,
+ [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs,
+ [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug,
+ [CLUSTER_ATTR_LOG_INFO] = &cluster_attr_log_info,
+ [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol,
+ [CLUSTER_ATTR_MARK] = &cluster_attr_mark,
+#ifdef CONFIG_DLM_DEPRECATED_API
+ [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs,
+#endif
+ [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count,
+ [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks,
+ [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name,
+ NULL,
+};
+
+enum {
+ COMM_ATTR_NODEID = 0,
+ COMM_ATTR_LOCAL,
+ COMM_ATTR_ADDR,
+ COMM_ATTR_ADDR_LIST,
+ COMM_ATTR_MARK,
+};
+
+enum {
+ NODE_ATTR_NODEID = 0,
+ NODE_ATTR_WEIGHT,
+};
+
+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_nodes *nds;
+};
+
+struct dlm_comms {
+ struct config_group cs_group;
+};
+
+struct dlm_comm {
+ struct config_item item;
+ int seq;
+ int nodeid;
+ int local;
+ int addr_count;
+ unsigned int mark;
+ 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,
+};
+
+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,
+};
+
+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,
+};
+
+static const struct config_item_type clusters_type = {
+ .ct_group_ops = &clusters_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static const struct config_item_type cluster_type = {
+ .ct_item_ops = &cluster_ops,
+ .ct_attrs = cluster_attrs,
+ .ct_owner = THIS_MODULE,
+};
+
+static const struct config_item_type spaces_type = {
+ .ct_group_ops = &spaces_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static const struct config_item_type space_type = {
+ .ct_item_ops = &space_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static const struct config_item_type comms_type = {
+ .ct_group_ops = &comms_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static const struct config_item_type comm_type = {
+ .ct_item_ops = &comm_ops,
+ .ct_attrs = comm_attrs,
+ .ct_owner = THIS_MODULE,
+};
+
+static const struct config_item_type nodes_type = {
+ .ct_group_ops = &nodes_ops,
+ .ct_owner = THIS_MODULE,
+};
+
+static const struct config_item_type node_type = {
+ .ct_item_ops = &node_ops,
+ .ct_attrs = node_attrs,
+ .ct_owner = THIS_MODULE,
+};
+
+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;
+
+ cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
+ sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
+ cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
+
+ if (!cl || !sps || !cms)
+ goto fail;
+
+ cl->sps = sps;
+ cl->cms = cms;
+
+ 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);
+
+ configfs_add_default_group(&sps->ss_group, &cl->group);
+ configfs_add_default_group(&cms->cs_group, &cl->group);
+
+ 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_log_info = dlm_config.ci_log_info;
+ cl->cl_protocol = dlm_config.ci_protocol;
+#ifdef CONFIG_DLM_DEPRECATED_API
+ cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
+#endif
+ 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(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);
+
+ configfs_remove_default_groups(&cl->group);
+
+ 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->sps);
+ kfree(cl->cms);
+ 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;
+
+ sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
+ nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
+
+ if (!sp || !nds)
+ goto fail;
+
+ config_group_init_type_name(&sp->group, name, &space_type);
+
+ config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
+ configfs_add_default_group(&nds->ns_group, &sp->group);
+
+ INIT_LIST_HEAD(&sp->members);
+ mutex_init(&sp->members_lock);
+ sp->members_count = 0;
+ sp->nds = nds;
+ return &sp->group;
+
+ fail:
+ kfree(sp);
+ 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);
+
+ /* assert list_empty(&sp->members) */
+
+ configfs_remove_default_groups(&sp->group);
+ config_item_put(i);
+}
+
+static void release_space(struct config_item *i)
+{
+ struct dlm_space *sp = config_item_to_space(i);
+ kfree(sp->nds);
+ 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;
+ cm->mark = 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_midcomms_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 comm_nodeid_show(struct config_item *item, char *buf)
+{
+ return sprintf(buf, "%d\n", config_item_to_comm(item)->nodeid);
+}
+
+static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
+ size_t len)
+{
+ int rc = kstrtoint(buf, 0, &config_item_to_comm(item)->nodeid);
+
+ if (rc)
+ return rc;
+ return len;
+}
+
+static ssize_t comm_local_show(struct config_item *item, char *buf)
+{
+ return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
+}
+
+static ssize_t comm_local_store(struct config_item *item, const char *buf,
+ size_t len)
+{
+ struct dlm_comm *cm = config_item_to_comm(item);
+ int rc = kstrtoint(buf, 0, &cm->local);
+
+ if (rc)
+ return rc;
+ if (cm->local && !local_comm)
+ local_comm = cm;
+ return len;
+}
+
+static ssize_t comm_addr_store(struct config_item *item, const char *buf,
+ size_t len)
+{
+ struct dlm_comm *cm = config_item_to_comm(item);
+ 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_show(struct config_item *item, char *buf)
+{
+ struct dlm_comm *cm = config_item_to_comm(item);
+ 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 comm_mark_show(struct config_item *item, char *buf)
+{
+ return sprintf(buf, "%u\n", config_item_to_comm(item)->mark);
+}
+
+static ssize_t comm_mark_store(struct config_item *item, const char *buf,
+ size_t len)
+{
+ struct dlm_comm *comm;
+ unsigned int mark;
+ int rc;
+
+ rc = kstrtouint(buf, 0, &mark);
+ if (rc)
+ return rc;
+
+ if (mark == 0)
+ mark = dlm_config.ci_mark;
+
+ comm = config_item_to_comm(item);
+ rc = dlm_lowcomms_nodes_set_mark(comm->nodeid, mark);
+ if (rc)
+ return rc;
+
+ comm->mark = mark;
+ return len;
+}
+
+CONFIGFS_ATTR(comm_, nodeid);
+CONFIGFS_ATTR(comm_, local);
+CONFIGFS_ATTR(comm_, mark);
+CONFIGFS_ATTR_WO(comm_, addr);
+CONFIGFS_ATTR_RO(comm_, addr_list);
+
+static struct configfs_attribute *comm_attrs[] = {
+ [COMM_ATTR_NODEID] = &comm_attr_nodeid,
+ [COMM_ATTR_LOCAL] = &comm_attr_local,
+ [COMM_ATTR_ADDR] = &comm_attr_addr,
+ [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
+ [COMM_ATTR_MARK] = &comm_attr_mark,
+ NULL,
+};
+
+static ssize_t node_nodeid_show(struct config_item *item, char *buf)
+{
+ return sprintf(buf, "%d\n", config_item_to_node(item)->nodeid);
+}
+
+static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
+ size_t len)
+{
+ struct dlm_node *nd = config_item_to_node(item);
+ uint32_t seq = 0;
+ int rc = kstrtoint(buf, 0, &nd->nodeid);
+
+ if (rc)
+ return rc;
+ dlm_comm_seq(nd->nodeid, &seq);
+ nd->comm_seq = seq;
+ return len;
+}
+
+static ssize_t node_weight_show(struct config_item *item, char *buf)
+{
+ return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
+}
+
+static ssize_t node_weight_store(struct config_item *item, const char *buf,
+ size_t len)
+{
+ int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
+
+ if (rc)
+ return rc;
+ return len;
+}
+
+CONFIGFS_ATTR(node_, nodeid);
+CONFIGFS_ATTR(node_, weight);
+
+static struct configfs_attribute *node_attrs[] = {
+ [NODE_ATTR_NODEID] = &node_attr_nodeid,
+ [NODE_ATTR_WEIGHT] = &node_attr_weight,
+ NULL,
+};
+
+/*
+ * 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_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_LOG_INFO 1
+#define DEFAULT_PROTOCOL DLM_PROTO_TCP
+#define DEFAULT_MARK 0
+#ifdef CONFIG_DLM_DEPRECATED_API
+#define DEFAULT_TIMEWARN_CS 500 /* 5 sec = 500 centiseconds */
+#endif
+#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 = DLM_MAX_SOCKET_BUFSIZE,
+ .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_log_info = DEFAULT_LOG_INFO,
+ .ci_protocol = DEFAULT_PROTOCOL,
+ .ci_mark = DEFAULT_MARK,
+#ifdef CONFIG_DLM_DEPRECATED_API
+ .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
+#endif
+ .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
+ .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
+ .ci_cluster_name = DEFAULT_CLUSTER_NAME
+};
+