diff options
Diffstat (limited to 'fs/dlm/config.c')
| -rw-r--r-- | fs/dlm/config.c | 1040 |
1 files changed, 1040 insertions, 0 deletions
diff --git a/fs/dlm/config.c b/fs/dlm/config.c new file mode 100644 index 000000000..d521bddf8 --- /dev/null +++ b/fs/dlm/config.c @@ -0,0 +1,1040 @@ +/****************************************************************************** +******************************************************************************* +** +** 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) +{ + 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; +} + +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; + int rc; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + rc = kstrtouint(buf, 0, &x); + if (rc) + return rc; + + 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) +{ + int rc = kstrtoint(buf, 0, &cm->nodeid); + + if (rc) + return rc; + 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) +{ + 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_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; + 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_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) +{ + int rc = kstrtoint(buf, 0, &nd->weight); + + if (rc) + return rc; + 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 +}; + |