[DLM] expose dlm_config_info fields in configfs

Make the dlm_config_info values readable and writeable via configfs
entries.

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

1 files changed, 132 insertions, 4 deletions

diff --git a/fs/dlm/config.c b/fs/dlm/config.c
index 7cf20209b127..8665c88e5af2 100644
--- a/fs/dlm/config.c
+++ b/fs/dlm/config.c
@@ -54,6 +54,11 @@ 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,
@@ -73,6 +78,101 @@ static ssize_t node_nodeid_write(struct node *nd, const char *buf, size_t len);
 static ssize_t node_weight_read(struct node *nd, char *buf);
 static ssize_t node_weight_write(struct node *nd, const char *buf, size_t len);
 
+struct cluster {
+        struct config_group group;
+        unsigned int cl_tcp_port;
+        unsigned int cl_buffer_size;
+        unsigned int cl_rsbtbl_size;
+        unsigned int cl_lkbtbl_size;
+        unsigned int cl_dirtbl_size;
+        unsigned int cl_recover_timer;
+        unsigned int cl_toss_secs;
+        unsigned int cl_scan_secs;
+        unsigned int cl_log_debug;
+};
+
+enum {
+        CLUSTER_ATTR_TCP_PORT = 0,
+        CLUSTER_ATTR_BUFFER_SIZE,
+        CLUSTER_ATTR_RSBTBL_SIZE,
+        CLUSTER_ATTR_LKBTBL_SIZE,
+        CLUSTER_ATTR_DIRTBL_SIZE,
+        CLUSTER_ATTR_RECOVER_TIMER,
+        CLUSTER_ATTR_TOSS_SECS,
+        CLUSTER_ATTR_SCAN_SECS,
+        CLUSTER_ATTR_LOG_DEBUG,
+};
+
+struct cluster_attribute {
+        struct configfs_attribute attr;
+        ssize_t (*show)(struct cluster *, char *);
+        ssize_t (*store)(struct cluster *, const char *, size_t);
+};
+
+static ssize_t cluster_set(struct cluster *cl, unsigned int *cl_field,
+                           unsigned 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 __CONFIGFS_ATTR(_name,_mode,_read,_write) {                           \
+        .attr   = { .ca_name = __stringify(_name),                            \
+                    .ca_mode = _mode,                                         \
+                    .ca_owner = THIS_MODULE },                                \
+        .show   = _read,                                                      \
+        .store  = _write,                                                     \
+}
+
+#define CLUSTER_ATTR(name, check_zero)                                        \
+static ssize_t name##_write(struct 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 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(lkbtbl_size, 1);
+CLUSTER_ATTR(dirtbl_size, 1);
+CLUSTER_ATTR(recover_timer, 1);
+CLUSTER_ATTR(toss_secs, 1);
+CLUSTER_ATTR(scan_secs, 1);
+CLUSTER_ATTR(log_debug, 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_LKBTBL_SIZE] = &cluster_attr_lkbtbl_size.attr,
+        [CLUSTER_ATTR_DIRTBL_SIZE] = &cluster_attr_dirtbl_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,
+        NULL,
+};
+
 enum {
         COMM_ATTR_NODEID = 0,
         COMM_ATTR_LOCAL,
@@ -152,10 +252,6 @@ struct clusters {
         struct configfs_subsystem subsys;
 };
 
-struct cluster {
-        struct config_group group;
-};
-
 struct spaces {
         struct config_group ss_group;
 };
@@ -197,6 +293,8 @@ static struct configfs_group_operations clusters_ops = {
 
 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 = {
@@ -237,6 +335,7 @@ static struct config_item_type clusters_type = {
 
 static struct config_item_type cluster_type = {
         .ct_item_ops = &cluster_ops,
+        .ct_attrs = cluster_attrs,
         .ct_owner = THIS_MODULE,
 };
 
@@ -317,6 +416,16 @@ static struct config_group *make_cluster(struct config_group *g,
         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_lkbtbl_size = dlm_config.ci_lkbtbl_size;
+        cl->cl_dirtbl_size = dlm_config.ci_dirtbl_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;
+
         space_list = &sps->ss_group;
         comm_list = &cms->cs_group;
         return &cl->group;
@@ -509,6 +618,25 @@ void dlm_config_exit(void)
  * Functions for user space to read/write attributes
  */
 
+static ssize_t show_cluster(struct config_item *i, struct configfs_attribute *a,
+                            char *buf)
+{
+        struct cluster *cl = 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 cluster *cl = 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)
 {