Commit 87d3d3f3 authored by Sunil Mushran's avatar Sunil Mushran Committed by Mark Fasheh

ocfs2/hb: Expose the list of heartbeating nodes via debugfs

This patch creates a debugfs file, o2hb/livesnodes, which exposes the
aggregate list of heartbeating node across all heartbeat regions.
Signed-off-by: default avatarSunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: default avatarMark Fasheh <mfasheh@suse.com>
parent 20bec8ab
......@@ -33,6 +33,7 @@
#include <linux/random.h>
#include <linux/crc32.h>
#include <linux/time.h>
#include <linux/debugfs.h>
#include "heartbeat.h"
#include "tcp.h"
......@@ -60,6 +61,11 @@ static unsigned long o2hb_live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
static LIST_HEAD(o2hb_node_events);
static DECLARE_WAIT_QUEUE_HEAD(o2hb_steady_queue);
#define O2HB_DEBUG_DIR "o2hb"
#define O2HB_DEBUG_LIVENODES "livenodes"
static struct dentry *o2hb_debug_dir;
static struct dentry *o2hb_debug_livenodes;
static LIST_HEAD(o2hb_all_regions);
static struct o2hb_callback {
......@@ -905,7 +911,77 @@ static int o2hb_thread(void *data)
return 0;
}
void o2hb_init(void)
#ifdef CONFIG_DEBUG_FS
static int o2hb_debug_open(struct inode *inode, struct file *file)
{
unsigned long map[BITS_TO_LONGS(O2NM_MAX_NODES)];
char *buf = NULL;
int i = -1;
int out = 0;
buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
if (!buf)
goto bail;
o2hb_fill_node_map(map, sizeof(map));
while ((i = find_next_bit(map, O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES)
out += snprintf(buf + out, PAGE_SIZE - out, "%d ", i);
out += snprintf(buf + out, PAGE_SIZE - out, "\n");
i_size_write(inode, out);
file->private_data = buf;
return 0;
bail:
return -ENOMEM;
}
static int o2hb_debug_release(struct inode *inode, struct file *file)
{
kfree(file->private_data);
return 0;
}
static ssize_t o2hb_debug_read(struct file *file, char __user *buf,
size_t nbytes, loff_t *ppos)
{
return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
i_size_read(file->f_mapping->host));
}
#else
static int o2hb_debug_open(struct inode *inode, struct file *file)
{
return 0;
}
static int o2hb_debug_release(struct inode *inode, struct file *file)
{
return 0;
}
static ssize_t o2hb_debug_read(struct file *file, char __user *buf,
size_t nbytes, loff_t *ppos)
{
return 0;
}
#endif /* CONFIG_DEBUG_FS */
static struct file_operations o2hb_debug_fops = {
.open = o2hb_debug_open,
.release = o2hb_debug_release,
.read = o2hb_debug_read,
.llseek = generic_file_llseek,
};
void o2hb_exit(void)
{
if (o2hb_debug_livenodes)
debugfs_remove(o2hb_debug_livenodes);
if (o2hb_debug_dir)
debugfs_remove(o2hb_debug_dir);
}
int o2hb_init(void)
{
int i;
......@@ -918,6 +994,24 @@ void o2hb_init(void)
INIT_LIST_HEAD(&o2hb_node_events);
memset(o2hb_live_node_bitmap, 0, sizeof(o2hb_live_node_bitmap));
o2hb_debug_dir = debugfs_create_dir(O2HB_DEBUG_DIR, NULL);
if (!o2hb_debug_dir) {
mlog_errno(-ENOMEM);
return -ENOMEM;
}
o2hb_debug_livenodes = debugfs_create_file(O2HB_DEBUG_LIVENODES,
S_IFREG|S_IRUSR,
o2hb_debug_dir, NULL,
&o2hb_debug_fops);
if (!o2hb_debug_livenodes) {
mlog_errno(-ENOMEM);
debugfs_remove(o2hb_debug_dir);
return -ENOMEM;
}
return 0;
}
/* if we're already in a callback then we're already serialized by the sem */
......
......@@ -75,7 +75,8 @@ void o2hb_unregister_callback(const char *region_uuid,
struct o2hb_callback_func *hc);
void o2hb_fill_node_map(unsigned long *map,
unsigned bytes);
void o2hb_init(void);
void o2hb_exit(void);
int o2hb_init(void);
int o2hb_check_node_heartbeating(u8 node_num);
int o2hb_check_node_heartbeating_from_callback(u8 node_num);
int o2hb_check_local_node_heartbeating(void);
......
......@@ -881,6 +881,7 @@ static void __exit exit_o2nm(void)
o2cb_sys_shutdown();
o2net_exit();
o2hb_exit();
}
static int __init init_o2nm(void)
......@@ -889,11 +890,13 @@ static int __init init_o2nm(void)
cluster_print_version();
o2hb_init();
ret = o2hb_init();
if (ret)
goto out;
ret = o2net_init();
if (ret)
goto out;
goto out_o2hb;
ret = o2net_register_hb_callbacks();
if (ret)
......@@ -916,6 +919,8 @@ static int __init init_o2nm(void)
o2net_unregister_hb_callbacks();
out_o2net:
o2net_exit();
out_o2hb:
o2hb_exit();
out:
return ret;
}
......
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