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Commit d200778e authored by David Teigland's avatar David Teigland Committed by Steven Whitehouse
Browse files

[DLM] expose dlm_config_info fields in configfs 



Make the dlm_config_info values readable and writeable via configfs
entries.

Signed-off-by: default avatarDavid Teigland <teigland@redhat.com>
Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
parent 99fc6487

fs/dlm/config.c

+132 −4
Original line number Diff line number Diff line
@@ -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)

{