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Commit 007dce53 authored by Sunil Mushran's avatar Sunil Mushran Committed by Mark Fasheh
Browse files

ocfs2/dlm: Dump the dlm state in a debugfs file



This patch dumps the dlm state (dlm_ctxt) into a debugfs file.
Useful for debugging.

Signed-off-by: default avatarSunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: default avatarJoel Becker <joel.becker@oracle.com>
Signed-off-by: default avatarMark Fasheh <mfasheh@suse.com>
parent 6325b4a2
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+1 −0
Original line number Diff line number Diff line
@@ -123,6 +123,7 @@ struct dlm_ctxt
	atomic_t remote_resources;
	atomic_t unknown_resources;

	struct dlm_debug_ctxt *dlm_debug_ctxt;
	struct dentry *dlm_debugfs_subroot;

	/* NOTE: Next three are protected by dlm_domain_lock */
+296 −0
Original line number Diff line number Diff line
@@ -274,6 +274,294 @@ EXPORT_SYMBOL_GPL(dlm_errname);
static struct dentry *dlm_debugfs_root = NULL;

#define DLM_DEBUGFS_DIR				"o2dlm"
#define DLM_DEBUGFS_DLM_STATE			"dlm_state"

/* begin - utils funcs */
static void dlm_debug_free(struct kref *kref)
{
	struct dlm_debug_ctxt *dc;

	dc = container_of(kref, struct dlm_debug_ctxt, debug_refcnt);

	kfree(dc);
}

void dlm_debug_put(struct dlm_debug_ctxt *dc)
{
	if (dc)
		kref_put(&dc->debug_refcnt, dlm_debug_free);
}

static void dlm_debug_get(struct dlm_debug_ctxt *dc)
{
	kref_get(&dc->debug_refcnt);
}

static int stringify_nodemap(unsigned long *nodemap, int maxnodes,
			     char *buf, int len)
{
	int out = 0;
	int i = -1;

	while ((i = find_next_bit(nodemap, maxnodes, i + 1)) < maxnodes)
		out += snprintf(buf + out, len - out, "%d ", i);

	return out;
}

static struct debug_buffer *debug_buffer_allocate(void)
{
	struct debug_buffer *db = NULL;

	db = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
	if (!db)
		goto bail;

	db->len = PAGE_SIZE;
	db->buf = kmalloc(db->len, GFP_KERNEL);
	if (!db->buf)
		goto bail;

	return db;
bail:
	kfree(db);
	return NULL;
}

static ssize_t debug_buffer_read(struct file *file, char __user *buf,
				 size_t nbytes, loff_t *ppos)
{
	struct debug_buffer *db = file->private_data;

	return simple_read_from_buffer(buf, nbytes, ppos, db->buf, db->len);
}

static loff_t debug_buffer_llseek(struct file *file, loff_t off, int whence)
{
	struct debug_buffer *db = file->private_data;
	loff_t new = -1;

	switch (whence) {
	case 0:
		new = off;
		break;
	case 1:
		new = file->f_pos + off;
		break;
	}

	if (new < 0 || new > db->len)
		return -EINVAL;

	return (file->f_pos = new);
}

static int debug_buffer_release(struct inode *inode, struct file *file)
{
	struct debug_buffer *db = (struct debug_buffer *)file->private_data;

	if (db)
		kfree(db->buf);
	kfree(db);

	return 0;
}
/* end - util funcs */

/* begin - debug state funcs */
static int debug_state_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
{
	int out = 0;
	struct dlm_reco_node_data *node;
	char *state;
	int lres, rres, ures, tres;

	lres = atomic_read(&dlm->local_resources);
	rres = atomic_read(&dlm->remote_resources);
	ures = atomic_read(&dlm->unknown_resources);
	tres = lres + rres + ures;

	spin_lock(&dlm->spinlock);

	switch (dlm->dlm_state) {
	case DLM_CTXT_NEW:
		state = "NEW"; break;
	case DLM_CTXT_JOINED:
		state = "JOINED"; break;
	case DLM_CTXT_IN_SHUTDOWN:
		state = "SHUTDOWN"; break;
	case DLM_CTXT_LEAVING:
		state = "LEAVING"; break;
	default:
		state = "UNKNOWN"; break;
	}

	/* Domain: xxxxxxxxxx  Key: 0xdfbac769 */
	out += snprintf(db->buf + out, db->len - out,
			"Domain: %s  Key: 0x%08x\n", dlm->name, dlm->key);

	/* Thread Pid: xxx  Node: xxx  State: xxxxx */
	out += snprintf(db->buf + out, db->len - out,
			"Thread Pid: %d  Node: %d  State: %s\n",
			dlm->dlm_thread_task->pid, dlm->node_num, state);

	/* Number of Joins: xxx  Joining Node: xxx */
	out += snprintf(db->buf + out, db->len - out,
			"Number of Joins: %d  Joining Node: %d\n",
			dlm->num_joins, dlm->joining_node);

	/* Domain Map: xx xx xx */
	out += snprintf(db->buf + out, db->len - out, "Domain Map: ");
	out += stringify_nodemap(dlm->domain_map, O2NM_MAX_NODES,
				 db->buf + out, db->len - out);
	out += snprintf(db->buf + out, db->len - out, "\n");

	/* Live Map: xx xx xx */
	out += snprintf(db->buf + out, db->len - out, "Live Map: ");
	out += stringify_nodemap(dlm->live_nodes_map, O2NM_MAX_NODES,
				 db->buf + out, db->len - out);
	out += snprintf(db->buf + out, db->len - out, "\n");

	/* Mastered Resources Total: xxx  Locally: xxx  Remotely: ... */
	out += snprintf(db->buf + out, db->len - out,
			"Mastered Resources Total: %d  Locally: %d  "
			"Remotely: %d  Unknown: %d\n",
			tres, lres, rres, ures);

	/* Lists: Dirty=Empty  Purge=InUse  PendingASTs=Empty  ... */
	out += snprintf(db->buf + out, db->len - out,
			"Lists: Dirty=%s  Purge=%s  PendingASTs=%s  "
			"PendingBASTs=%s  Master=%s\n",
			(list_empty(&dlm->dirty_list) ? "Empty" : "InUse"),
			(list_empty(&dlm->purge_list) ? "Empty" : "InUse"),
			(list_empty(&dlm->pending_asts) ? "Empty" : "InUse"),
			(list_empty(&dlm->pending_basts) ? "Empty" : "InUse"),
			(list_empty(&dlm->master_list) ? "Empty" : "InUse"));

	/* Purge Count: xxx  Refs: xxx */
	out += snprintf(db->buf + out, db->len - out,
			"Purge Count: %d  Refs: %d\n", dlm->purge_count,
			atomic_read(&dlm->dlm_refs.refcount));

	/* Dead Node: xxx */
	out += snprintf(db->buf + out, db->len - out,
			"Dead Node: %d\n", dlm->reco.dead_node);

	/* What about DLM_RECO_STATE_FINALIZE? */
	if (dlm->reco.state == DLM_RECO_STATE_ACTIVE)
		state = "ACTIVE";
	else
		state = "INACTIVE";

	/* Recovery Pid: xxxx  Master: xxx  State: xxxx */
	out += snprintf(db->buf + out, db->len - out,
			"Recovery Pid: %d  Master: %d  State: %s\n",
			dlm->dlm_reco_thread_task->pid,
			dlm->reco.new_master, state);

	/* Recovery Map: xx xx */
	out += snprintf(db->buf + out, db->len - out, "Recovery Map: ");
	out += stringify_nodemap(dlm->recovery_map, O2NM_MAX_NODES,
				 db->buf + out, db->len - out);
	out += snprintf(db->buf + out, db->len - out, "\n");

	/* Recovery Node State: */
	out += snprintf(db->buf + out, db->len - out, "Recovery Node State:\n");
	list_for_each_entry(node, &dlm->reco.node_data, list) {
		switch (node->state) {
		case DLM_RECO_NODE_DATA_INIT:
			state = "INIT";
			break;
		case DLM_RECO_NODE_DATA_REQUESTING:
			state = "REQUESTING";
			break;
		case DLM_RECO_NODE_DATA_DEAD:
			state = "DEAD";
			break;
		case DLM_RECO_NODE_DATA_RECEIVING:
			state = "RECEIVING";
			break;
		case DLM_RECO_NODE_DATA_REQUESTED:
			state = "REQUESTED";
			break;
		case DLM_RECO_NODE_DATA_DONE:
			state = "DONE";
			break;
		case DLM_RECO_NODE_DATA_FINALIZE_SENT:
			state = "FINALIZE-SENT";
			break;
		default:
			state = "BAD";
			break;
		}
		out += snprintf(db->buf + out, db->len - out, "\t%u - %s\n",
				node->node_num, state);
	}

	spin_unlock(&dlm->spinlock);

	return out;
}

static int debug_state_open(struct inode *inode, struct file *file)
{
	struct dlm_ctxt *dlm = inode->i_private;
	struct debug_buffer *db = NULL;

	db = debug_buffer_allocate();
	if (!db)
		goto bail;

	db->len = debug_state_print(dlm, db);

	file->private_data = db;

	return 0;
bail:
	return -ENOMEM;
}

static struct file_operations debug_state_fops = {
	.open =		debug_state_open,
	.release =	debug_buffer_release,
	.read =		debug_buffer_read,
	.llseek =	debug_buffer_llseek,
};
/* end  - debug state funcs */

/* files in subroot */
int dlm_debug_init(struct dlm_ctxt *dlm)
{
	struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;

	/* for dumping dlm_ctxt */
	dc->debug_state_dentry = debugfs_create_file(DLM_DEBUGFS_DLM_STATE,
						     S_IFREG|S_IRUSR,
						     dlm->dlm_debugfs_subroot,
						     dlm, &debug_state_fops);
	if (!dc->debug_state_dentry) {
		mlog_errno(-ENOMEM);
		goto bail;
	}

	dlm_debug_get(dc);
	return 0;

bail:
	dlm_debug_shutdown(dlm);
	return -ENOMEM;
}

void dlm_debug_shutdown(struct dlm_ctxt *dlm)
{
	struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;

	if (dc) {
		if (dc->debug_state_dentry)
			debugfs_remove(dc->debug_state_dentry);
		dlm_debug_put(dc);
	}
}

/* subroot - domain dir */
int dlm_create_debugfs_subroot(struct dlm_ctxt *dlm)
@@ -285,6 +573,14 @@ int dlm_create_debugfs_subroot(struct dlm_ctxt *dlm)
		goto bail;
	}

	dlm->dlm_debug_ctxt = kzalloc(sizeof(struct dlm_debug_ctxt),
				      GFP_KERNEL);
	if (!dlm->dlm_debug_ctxt) {
		mlog_errno(-ENOMEM);
		goto bail;
	}
	kref_init(&dlm->dlm_debug_ctxt->debug_refcnt);

	return 0;
bail:
	dlm_destroy_debugfs_subroot(dlm);
+20 −0
Original line number Diff line number Diff line
@@ -27,6 +27,19 @@

#ifdef CONFIG_DEBUG_FS

struct dlm_debug_ctxt {
	struct kref debug_refcnt;
	struct dentry *debug_state_dentry;
};

struct debug_buffer {
	int len;
	char *buf;
};

int dlm_debug_init(struct dlm_ctxt *dlm);
void dlm_debug_shutdown(struct dlm_ctxt *dlm);

int dlm_create_debugfs_subroot(struct dlm_ctxt *dlm);
void dlm_destroy_debugfs_subroot(struct dlm_ctxt *dlm);

@@ -35,6 +48,13 @@ void dlm_destroy_debugfs_root(void);

#else

static int dlm_debug_init(struct dlm_ctxt *dlm)
{
	return 0;
}
static void dlm_debug_shutdown(struct dlm_ctxt *dlm)
{
}
static int dlm_create_debugfs_subroot(struct dlm_ctxt *dlm)
{
	return 0;
+8 −0
Original line number Diff line number Diff line
@@ -398,6 +398,7 @@ static void dlm_destroy_dlm_worker(struct dlm_ctxt *dlm)
static void dlm_complete_dlm_shutdown(struct dlm_ctxt *dlm)
{
	dlm_unregister_domain_handlers(dlm);
	dlm_debug_shutdown(dlm);
	dlm_complete_thread(dlm);
	dlm_complete_recovery_thread(dlm);
	dlm_destroy_dlm_worker(dlm);
@@ -1418,6 +1419,12 @@ static int dlm_join_domain(struct dlm_ctxt *dlm)
		goto bail;
	}

	status = dlm_debug_init(dlm);
	if (status < 0) {
		mlog_errno(status);
		goto bail;
	}

	status = dlm_launch_thread(dlm);
	if (status < 0) {
		mlog_errno(status);
@@ -1485,6 +1492,7 @@ static int dlm_join_domain(struct dlm_ctxt *dlm)

	if (status) {
		dlm_unregister_domain_handlers(dlm);
		dlm_debug_shutdown(dlm);
		dlm_complete_thread(dlm);
		dlm_complete_recovery_thread(dlm);
		dlm_destroy_dlm_worker(dlm);