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Commit d0129ace authored by Sunil Mushran's avatar Sunil Mushran Committed by Mark Fasheh
Browse files

ocfs2/dlm: Dumps the mles into a debugfs file 



This patch dumps all mles it can fit in one page 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 751155a9

fs/ocfs2/dlm/dlmdebug.c

+119 −0
Original line number Diff line number Diff line
@@ -302,6 +302,7 @@ static int stringify_lockname(const char *lockname, int locklen, 
#define DLM_DEBUGFS_DIR				"o2dlm"

#define DLM_DEBUGFS_DLM_STATE			"dlm_state"

#define DLM_DEBUGFS_LOCKING_STATE		"locking_state"

#define DLM_DEBUGFS_MLE_STATE			"mle_state"



/* begin - utils funcs */

static void dlm_debug_free(struct kref *kref)
@@ -395,6 +396,112 @@ static int debug_buffer_release(struct inode *inode, struct file *file) 
}

/* end - util funcs */



/* begin - debug mle funcs */

static int dump_mle(struct dlm_master_list_entry *mle, char *buf, int len)

{

	int out = 0;

	unsigned int namelen;

	const char *name;

	char *mle_type;



	if (mle->type != DLM_MLE_MASTER) {

		namelen = mle->u.name.len;

		name = mle->u.name.name;

	} else {

		namelen = mle->u.res->lockname.len;

		name = mle->u.res->lockname.name;

	}



	if (mle->type == DLM_MLE_BLOCK)

		mle_type = "BLK";

	else if (mle->type == DLM_MLE_MASTER)

		mle_type = "MAS";

	else

		mle_type = "MIG";



	out += stringify_lockname(name, namelen, buf + out, len - out);

	out += snprintf(buf + out, len - out,

			"\t%3s\tmas=%3u\tnew=%3u\tevt=%1d\tuse=%1d\tref=%3d\n",

			mle_type, mle->master, mle->new_master,

			!list_empty(&mle->hb_events),

			!!mle->inuse,

			atomic_read(&mle->mle_refs.refcount));



	out += snprintf(buf + out, len - out, "Maybe=");

	out += stringify_nodemap(mle->maybe_map, O2NM_MAX_NODES,

				 buf + out, len - out);

	out += snprintf(buf + out, len - out, "\n");



	out += snprintf(buf + out, len - out, "Vote=");

	out += stringify_nodemap(mle->vote_map, O2NM_MAX_NODES,

				 buf + out, len - out);

	out += snprintf(buf + out, len - out, "\n");



	out += snprintf(buf + out, len - out, "Response=");

	out += stringify_nodemap(mle->response_map, O2NM_MAX_NODES,

				 buf + out, len - out);

	out += snprintf(buf + out, len - out, "\n");



	out += snprintf(buf + out, len - out, "Node=");

	out += stringify_nodemap(mle->node_map, O2NM_MAX_NODES,

				 buf + out, len - out);

	out += snprintf(buf + out, len - out, "\n");



	out += snprintf(buf + out, len - out, "\n");



	return out;

}



static int debug_mle_print(struct dlm_ctxt *dlm, struct debug_buffer *db)

{

	struct dlm_master_list_entry *mle;

	int out = 0;

	unsigned long total = 0;



	out += snprintf(db->buf + out, db->len - out,

			"Dumping MLEs for Domain: %s\n", dlm->name);



	spin_lock(&dlm->master_lock);

	list_for_each_entry(mle, &dlm->master_list, list) {

		++total;

		if (db->len - out < 200)

			continue;

		out += dump_mle(mle, db->buf + out, db->len - out);

	}

	spin_unlock(&dlm->master_lock);



	out += snprintf(db->buf + out, db->len - out,

			"Total on list: %ld\n", total);

	return out;

}



static int debug_mle_open(struct inode *inode, struct file *file)

{

	struct dlm_ctxt *dlm = inode->i_private;

	struct debug_buffer *db;



	db = debug_buffer_allocate();

	if (!db)

		goto bail;



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



	file->private_data = db;



	return 0;

bail:

	return -ENOMEM;

}



static struct file_operations debug_mle_fops = {

	.open =		debug_mle_open,

	.release =	debug_buffer_release,

	.read =		debug_buffer_read,

	.llseek =	debug_buffer_llseek,

};



/* end - debug mle funcs */



/* begin - debug lockres funcs */

static int dump_lock(struct dlm_lock *lock, int list_type, char *buf, int len)

{
@@ -789,6 +896,16 @@ int dlm_debug_init(struct dlm_ctxt *dlm) 
		goto bail;

	}



	/* for dumping mles */

	dc->debug_mle_dentry = debugfs_create_file(DLM_DEBUGFS_MLE_STATE,

						   S_IFREG|S_IRUSR,

						   dlm->dlm_debugfs_subroot,

						   dlm, &debug_mle_fops);

	if (!dc->debug_mle_dentry) {

		mlog_errno(-ENOMEM);

		goto bail;

	}



	dlm_debug_get(dc);

	return 0;
@@ -802,6 +919,8 @@ void dlm_debug_shutdown(struct dlm_ctxt *dlm) 
	struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt;



	if (dc) {

		if (dc->debug_mle_dentry)

			debugfs_remove(dc->debug_mle_dentry);

		if (dc->debug_lockres_dentry)

			debugfs_remove(dc->debug_lockres_dentry);

		if (dc->debug_state_dentry)

fs/ocfs2/dlm/dlmdebug.h

+1 −0
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ struct dlm_debug_ctxt { 
	struct kref debug_refcnt;

	struct dentry *debug_state_dentry;

	struct dentry *debug_lockres_dentry;

	struct dentry *debug_mle_dentry;

};



struct debug_buffer {