ocfs2/cluster: Add new function o2net_fill_node_map()
Patch adds function o2net_fill_node_map() to return the bitmap of nodes that
it is connected to. This bitmap is also accessible by the user via the debugfs
file, /sys/kernel/debug/o2net/connected_nodes.
Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
diff --git a/fs/ocfs2/cluster/netdebug.c b/fs/ocfs2/cluster/netdebug.c
index 3a58359..dc45deb 100644
--- a/fs/ocfs2/cluster/netdebug.c
+++ b/fs/ocfs2/cluster/netdebug.c
@@ -47,6 +47,7 @@
#define SC_DEBUG_NAME "sock_containers"
#define NST_DEBUG_NAME "send_tracking"
#define STATS_DEBUG_NAME "stats"
+#define NODES_DEBUG_NAME "connected_nodes"
#define SHOW_SOCK_CONTAINERS 0
#define SHOW_SOCK_STATS 1
@@ -55,6 +56,7 @@
static struct dentry *sc_dentry;
static struct dentry *nst_dentry;
static struct dentry *stats_dentry;
+static struct dentry *nodes_dentry;
static DEFINE_SPINLOCK(o2net_debug_lock);
@@ -491,53 +493,87 @@
.release = sc_fop_release,
};
-int o2net_debugfs_init(void)
+static int o2net_fill_bitmap(char *buf, int len)
{
- o2net_dentry = debugfs_create_dir(O2NET_DEBUG_DIR, NULL);
- if (!o2net_dentry) {
- mlog_errno(-ENOMEM);
- goto bail;
- }
+ unsigned long map[BITS_TO_LONGS(O2NM_MAX_NODES)];
+ int i = -1, out = 0;
- nst_dentry = debugfs_create_file(NST_DEBUG_NAME, S_IFREG|S_IRUSR,
- o2net_dentry, NULL,
- &nst_seq_fops);
- if (!nst_dentry) {
- mlog_errno(-ENOMEM);
- goto bail;
- }
+ o2net_fill_node_map(map, sizeof(map));
- sc_dentry = debugfs_create_file(SC_DEBUG_NAME, S_IFREG|S_IRUSR,
- o2net_dentry, NULL,
- &sc_seq_fops);
- if (!sc_dentry) {
- mlog_errno(-ENOMEM);
- goto bail;
- }
+ 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");
- stats_dentry = debugfs_create_file(STATS_DEBUG_NAME, S_IFREG|S_IRUSR,
- o2net_dentry, NULL,
- &stats_seq_fops);
- if (!stats_dentry) {
- mlog_errno(-ENOMEM);
- goto bail;
- }
+ return out;
+}
+
+static int nodes_fop_open(struct inode *inode, struct file *file)
+{
+ char *buf;
+
+ buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ i_size_write(inode, o2net_fill_bitmap(buf, PAGE_SIZE));
+
+ file->private_data = buf;
return 0;
-bail:
- debugfs_remove(stats_dentry);
- debugfs_remove(sc_dentry);
- debugfs_remove(nst_dentry);
- debugfs_remove(o2net_dentry);
- return -ENOMEM;
}
+static int o2net_debug_release(struct inode *inode, struct file *file)
+{
+ kfree(file->private_data);
+ return 0;
+}
+
+static ssize_t o2net_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));
+}
+
+static const struct file_operations nodes_fops = {
+ .open = nodes_fop_open,
+ .release = o2net_debug_release,
+ .read = o2net_debug_read,
+ .llseek = generic_file_llseek,
+};
+
void o2net_debugfs_exit(void)
{
+ debugfs_remove(nodes_dentry);
debugfs_remove(stats_dentry);
debugfs_remove(sc_dentry);
debugfs_remove(nst_dentry);
debugfs_remove(o2net_dentry);
}
+int o2net_debugfs_init(void)
+{
+ mode_t mode = S_IFREG|S_IRUSR;
+
+ o2net_dentry = debugfs_create_dir(O2NET_DEBUG_DIR, NULL);
+ if (o2net_dentry)
+ nst_dentry = debugfs_create_file(NST_DEBUG_NAME, mode,
+ o2net_dentry, NULL, &nst_seq_fops);
+ if (nst_dentry)
+ sc_dentry = debugfs_create_file(SC_DEBUG_NAME, mode,
+ o2net_dentry, NULL, &sc_seq_fops);
+ if (sc_dentry)
+ stats_dentry = debugfs_create_file(STATS_DEBUG_NAME, mode,
+ o2net_dentry, NULL, &stats_seq_fops);
+ if (stats_dentry)
+ nodes_dentry = debugfs_create_file(NODES_DEBUG_NAME, mode,
+ o2net_dentry, NULL, &nodes_fops);
+ if (nodes_dentry)
+ return 0;
+
+ o2net_debugfs_exit();
+ mlog_errno(-ENOMEM);
+ return -ENOMEM;
+}
+
#endif /* CONFIG_DEBUG_FS */