dlm: use per-attribute show and store methods

To simplify the configfs interface and remove boilerplate code that also
causes binary bloat.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Teigland <teigland@redhat.com
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 74 insertions, 214 deletions

diff --git a/fs/dlm/config.c b/fs/dlm/config.c
index d521bddf876d..8e294fbbac39 100644
--- a/fs/dlm/config.c
+++ b/fs/dlm/config.c
@@ -61,35 +61,8 @@ 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);
+static struct configfs_attribute *comm_attrs[];
+static struct configfs_attribute *node_attrs[];
 
 struct dlm_cluster {
         struct config_group group;
@@ -108,6 +81,12 @@ struct dlm_cluster {
         char cl_cluster_name[DLM_LOCKSPACE_LEN];
 };
 
+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,
@@ -124,33 +103,24 @@ enum {
         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)
+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_write(struct dlm_cluster *cl,
+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;
 }
 
-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,
-};
+CONFIGFS_ATTR(cluster_, cluster_name);
 
 static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
                            int *info_field, int check_zero,
@@ -175,17 +145,19 @@ static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
 }
 
 #define CLUSTER_ATTR(name, check_zero)                                        \
-static ssize_t name##_write(struct dlm_cluster *cl, const char *buf, size_t len) \
+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_zero, buf, len);                             \
 }                                                                             \
-static ssize_t name##_read(struct dlm_cluster *cl, char *buf)                 \
+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);               \
 }                                                                             \
-static struct cluster_attribute cluster_attr_##name =                         \
-__CONFIGFS_ATTR(name, 0644, name##_read, name##_write)
+CONFIGFS_ATTR(cluster_, name);
 
 CLUSTER_ATTR(tcp_port, 1);
 CLUSTER_ATTR(buffer_size, 1);
@@ -201,19 +173,19 @@ 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,
+        [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_PROTOCOL] = &cluster_attr_protocol,
+        [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs,
+        [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us,
+        [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,
 };
 
@@ -224,83 +196,11 @@ enum {
         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;
 };
@@ -349,8 +249,6 @@ 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 = {
@@ -369,8 +267,6 @@ static struct configfs_group_operations comms_ops = {
 
 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 = {
@@ -380,8 +276,6 @@ static struct configfs_group_operations nodes_ops = {
 
 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 = {
@@ -427,12 +321,6 @@ static struct config_item_type node_type = {
         .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) :
@@ -687,66 +575,30 @@ 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 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)
+static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
 {
-        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;
+        return sprintf(buf, "%d\n", config_item_to_comm(item)->nodeid);
 }
 
-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,
+static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
                                  size_t len)
 {
-        int rc = kstrtoint(buf, 0, &cm->nodeid);
+        int rc = kstrtoint(buf, 0, &config_item_to_comm(item)->nodeid);
 
         if (rc)
                 return rc;
         return len;
 }
 
-static ssize_t comm_local_read(struct dlm_comm *cm, char *buf)
+static ssize_t comm_local_show(struct config_item *item, char *buf)
 {
-        return sprintf(buf, "%d\n", cm->local);
+        return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
 }
 
-static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
+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)
@@ -756,8 +608,10 @@ static ssize_t comm_local_write(struct dlm_comm *cm, const char *buf,
         return len;
 }
 
-static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf, size_t 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;
 
@@ -783,8 +637,9 @@ static ssize_t comm_addr_write(struct dlm_comm *cm, const char *buf, size_t len)
         return len;
 }
 
-static ssize_t comm_addr_list_read(struct dlm_comm *cm, char *buf)
+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;
@@ -827,32 +682,28 @@ static ssize_t comm_addr_list_read(struct dlm_comm *cm, char *buf)
         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;
-}
+CONFIGFS_ATTR(comm_, nodeid);
+CONFIGFS_ATTR(comm_, local);
+CONFIGFS_ATTR_WO(comm_, addr);
+CONFIGFS_ATTR_RO(comm_, addr_list);
 
-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 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,
+        NULL,
+};
 
-static ssize_t node_nodeid_read(struct dlm_node *nd, char *buf)
+static ssize_t node_nodeid_show(struct config_item *item, char *buf)
 {
-        return sprintf(buf, "%d\n", nd->nodeid);
+        return sprintf(buf, "%d\n", config_item_to_node(item)->nodeid);
 }
 
-static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
+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);
 
@@ -863,21 +714,30 @@ static ssize_t node_nodeid_write(struct dlm_node *nd, const char *buf,
         return len;
 }
 
-static ssize_t node_weight_read(struct dlm_node *nd, char *buf)
+static ssize_t node_weight_show(struct config_item *item, char *buf)
 {
-        return sprintf(buf, "%d\n", nd->weight);
+        return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
 }
 
-static ssize_t node_weight_write(struct dlm_node *nd, const char *buf,
+static ssize_t node_weight_store(struct config_item *item, const char *buf,
                                  size_t len)
 {
-        int rc = kstrtoint(buf, 0, &nd->weight);
+        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
  */