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ocfs2/cluster: Reorganize o2hb debugfs init

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o2hb debugfs handling is reorganized to allow for easy expansion.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
This commit is contained in:
Sunil Mushran 2010-10-07 17:01:27 -07:00
parent 0e105d37c2
commit 8ca8b0bbd8
1 changed files with 78 additions and 23 deletions
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101
fs/ocfs2/cluster/heartbeat.c
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@ -62,8 +62,19 @@ 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_DB_TYPE_LIVENODES 0
struct o2hb_debug_buf {
int db_type;
int db_size;
int db_len;
void *db_data;
};
static struct o2hb_debug_buf *o2hb_db_livenodes;
#define O2HB_DEBUG_DIR "o2hb"
#define O2HB_DEBUG_LIVENODES "livenodes"
static struct dentry *o2hb_debug_dir;
static struct dentry *o2hb_debug_livenodes;
@ -969,21 +980,35 @@ static int o2hb_thread(void *data)
#ifdef CONFIG_DEBUG_FS
static int o2hb_debug_open(struct inode *inode, struct file *file)
{
struct o2hb_debug_buf *db = inode->i_private;
unsigned long map[BITS_TO_LONGS(O2NM_MAX_NODES)];
char *buf = NULL;
int i = -1;
int out = 0;
/* max_nodes should be the largest bitmap we pass here */
BUG_ON(sizeof(map) < db->db_size);
buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
if (!buf)
goto bail;
o2hb_fill_node_map(map, sizeof(map));
switch (db->db_type) {
case O2HB_DB_TYPE_LIVENODES:
spin_lock(&o2hb_live_lock);
memcpy(map, db->db_data, db->db_size);
spin_unlock(&o2hb_live_lock);
break;
while ((i = find_next_bit(map, O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES)
default:
goto done;
}
while ((i = find_next_bit(map, db->db_len, i + 1)) < db->db_len)
out += snprintf(buf + out, PAGE_SIZE - out, "%d ", i);
out += snprintf(buf + out, PAGE_SIZE - out, "\n");
done:
i_size_write(inode, out);
file->private_data = buf;
@ -1030,10 +1055,56 @@ static const struct file_operations o2hb_debug_fops = {
void o2hb_exit(void)
{
if (o2hb_debug_livenodes)
debugfs_remove(o2hb_debug_livenodes);
if (o2hb_debug_dir)
debugfs_remove(o2hb_debug_dir);
kfree(o2hb_db_livenodes);
debugfs_remove(o2hb_debug_livenodes);
debugfs_remove(o2hb_debug_dir);
}
static struct dentry *o2hb_debug_create(const char *name, struct dentry *dir,
struct o2hb_debug_buf **db, int db_len,
int type, int size, int len, void *data)
{
*db = kmalloc(db_len, GFP_KERNEL);
if (!*db)
return NULL;
(*db)->db_type = type;
(*db)->db_size = size;
(*db)->db_len = len;
(*db)->db_data = data;
return debugfs_create_file(name, S_IFREG|S_IRUSR, dir, *db,
&o2hb_debug_fops);
}
static int o2hb_debug_init(void)
{
int ret = -ENOMEM;
o2hb_debug_dir = debugfs_create_dir(O2HB_DEBUG_DIR, NULL);
if (!o2hb_debug_dir) {
mlog_errno(ret);
goto bail;
}
o2hb_debug_livenodes = o2hb_debug_create(O2HB_DEBUG_LIVENODES,
o2hb_debug_dir,
&o2hb_db_livenodes,
sizeof(*o2hb_db_livenodes),
O2HB_DB_TYPE_LIVENODES,
sizeof(o2hb_live_node_bitmap),
O2NM_MAX_NODES,
o2hb_live_node_bitmap);
if (!o2hb_debug_livenodes) {
mlog_errno(ret);
goto bail;
}
ret = 0;
bail:
if (ret)
o2hb_exit();
return ret;
}
int o2hb_init(void)
@ -1050,23 +1121,7 @@ int o2hb_init(void)
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;
return o2hb_debug_init();
}
/* if we're already in a callback then we're already serialized by the sem */