dlmdebug.c

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/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 * dlmdebug.c
 *
 * debug functionality for the dlm
 *
 * Copyright (C) 2004, 2008 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 *
 */

#include <linux/types.h>
#include <linux/slab.h>
#include <linux/highmem.h>
#include <linux/utsname.h>
#include <linux/sysctl.h>
#include <linux/spinlock.h>
#include <linux/debugfs.h>

#include "cluster/heartbeat.h"
#include "cluster/nodemanager.h"
#include "cluster/tcp.h"

#include "dlmapi.h"
#include "dlmcommon.h"
#include "dlmdomain.h"
#include "dlmdebug.h"

#define MLOG_MASK_PREFIX ML_DLM
#include "cluster/masklog.h"

static int stringify_lockname(const char *lockname, int locklen, char *buf,
			      int len);

void dlm_print_one_lock_resource(struct dlm_lock_resource *res)
{
	spin_lock(&res->spinlock);
	__dlm_print_one_lock_resource(res);
	spin_unlock(&res->spinlock);
}

static void dlm_print_lockres_refmap(struct dlm_lock_resource *res)
{
	int bit;
	assert_spin_locked(&res->spinlock);

	printk("  refmap nodes: [ ");
	bit = 0;
	while (1) {
		bit = find_next_bit(res->refmap, O2NM_MAX_NODES, bit);
		if (bit >= O2NM_MAX_NODES)
			break;
		printk("%u ", bit);
		bit++;
	}
	printk("], inflight=%u\n", res->inflight_locks);
}

static void __dlm_print_lock(struct dlm_lock *lock)
{
	spin_lock(&lock->spinlock);

	printk("    type=%d, conv=%d, node=%u, cookie=%u:%llu, "
	       "ref=%u, ast=(empty=%c,pend=%c), bast=(empty=%c,pend=%c), "
	       "pending=(conv=%c,lock=%c,cancel=%c,unlock=%c)\n",
	       lock->ml.type, lock->ml.convert_type, lock->ml.node,
	       dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
	       dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
	       atomic_read(&lock->lock_refs.refcount),
	       (list_empty(&lock->ast_list) ? 'y' : 'n'),
	       (lock->ast_pending ? 'y' : 'n'),
	       (list_empty(&lock->bast_list) ? 'y' : 'n'),
	       (lock->bast_pending ? 'y' : 'n'),
	       (lock->convert_pending ? 'y' : 'n'),
	       (lock->lock_pending ? 'y' : 'n'),
	       (lock->cancel_pending ? 'y' : 'n'),
	       (lock->unlock_pending ? 'y' : 'n'));

	spin_unlock(&lock->spinlock);
}

void __dlm_print_one_lock_resource(struct dlm_lock_resource *res)
{
	struct list_head *iter2;
	struct dlm_lock *lock;
	char buf[DLM_LOCKID_NAME_MAX];

	assert_spin_locked(&res->spinlock);

	stringify_lockname(res->lockname.name, res->lockname.len,
			   buf, sizeof(buf) - 1);
	printk("lockres: %s, owner=%u, state=%u\n",
	       buf, res->owner, res->state);
	printk("  last used: %lu, refcnt: %u, on purge list: %s\n",
	       res->last_used, atomic_read(&res->refs.refcount),
	       list_empty(&res->purge) ? "no" : "yes");
	printk("  on dirty list: %s, on reco list: %s, "
	       "migrating pending: %s\n",
	       list_empty(&res->dirty) ? "no" : "yes",
	       list_empty(&res->recovering) ? "no" : "yes",
	       res->migration_pending ? "yes" : "no");
	printk("  inflight locks: %d, asts reserved: %d\n",
	       res->inflight_locks, atomic_read(&res->asts_reserved));
	dlm_print_lockres_refmap(res);
	printk("  granted queue:\n");
	list_for_each(iter2, &res->granted) {
		lock = list_entry(iter2, struct dlm_lock, list);
		__dlm_print_lock(lock);
	}
	printk("  converting queue:\n");
	list_for_each(iter2, &res->converting) {
		lock = list_entry(iter2, struct dlm_lock, list);
		__dlm_print_lock(lock);
	}
	printk("  blocked queue:\n");
	list_for_each(iter2, &res->blocked) {
		lock = list_entry(iter2, struct dlm_lock, list);
		__dlm_print_lock(lock);
	}
}

void dlm_print_one_lock(struct dlm_lock *lockid)
{
	dlm_print_one_lock_resource(lockid->lockres);
}
EXPORT_SYMBOL_GPL(dlm_print_one_lock);

static const char *dlm_errnames[] = {
	[DLM_NORMAL] =			"DLM_NORMAL",
	[DLM_GRANTED] =			"DLM_GRANTED",
	[DLM_DENIED] =			"DLM_DENIED",
	[DLM_DENIED_NOLOCKS] =		"DLM_DENIED_NOLOCKS",
	[DLM_WORKING] =			"DLM_WORKING",
	[DLM_BLOCKED] =			"DLM_BLOCKED",
	[DLM_BLOCKED_ORPHAN] =		"DLM_BLOCKED_ORPHAN",
	[DLM_DENIED_GRACE_PERIOD] =	"DLM_DENIED_GRACE_PERIOD",
	[DLM_SYSERR] =			"DLM_SYSERR",
	[DLM_NOSUPPORT] =		"DLM_NOSUPPORT",
	[DLM_CANCELGRANT] =		"DLM_CANCELGRANT",
	[DLM_IVLOCKID] =		"DLM_IVLOCKID",
	[DLM_SYNC] =			"DLM_SYNC",
	[DLM_BADTYPE] =			"DLM_BADTYPE",
	[DLM_BADRESOURCE] =		"DLM_BADRESOURCE",
	[DLM_MAXHANDLES] =		"DLM_MAXHANDLES",
	[DLM_NOCLINFO] =		"DLM_NOCLINFO",
	[DLM_NOLOCKMGR] =		"DLM_NOLOCKMGR",
	[DLM_NOPURGED] =		"DLM_NOPURGED",
	[DLM_BADARGS] =			"DLM_BADARGS",
	[DLM_VOID] =			"DLM_VOID",
	[DLM_NOTQUEUED] =		"DLM_NOTQUEUED",
	[DLM_IVBUFLEN] =		"DLM_IVBUFLEN",
	[DLM_CVTUNGRANT] =		"DLM_CVTUNGRANT",
	[DLM_BADPARAM] =		"DLM_BADPARAM",
	[DLM_VALNOTVALID] =		"DLM_VALNOTVALID",
	[DLM_REJECTED] =		"DLM_REJECTED",
	[DLM_ABORT] =			"DLM_ABORT",
	[DLM_CANCEL] =			"DLM_CANCEL",
	[DLM_IVRESHANDLE] =		"DLM_IVRESHANDLE",
	[DLM_DEADLOCK] =		"DLM_DEADLOCK",
	[DLM_DENIED_NOASTS] =		"DLM_DENIED_NOASTS",
	[DLM_FORWARD] =			"DLM_FORWARD",
	[DLM_TIMEOUT] =			"DLM_TIMEOUT",
	[DLM_IVGROUPID] =		"DLM_IVGROUPID",
	[DLM_VERS_CONFLICT] =		"DLM_VERS_CONFLICT",
	[DLM_BAD_DEVICE_PATH] =		"DLM_BAD_DEVICE_PATH",
	[DLM_NO_DEVICE_PERMISSION] =	"DLM_NO_DEVICE_PERMISSION",
	[DLM_NO_CONTROL_DEVICE ] =	"DLM_NO_CONTROL_DEVICE ",
	[DLM_RECOVERING] =		"DLM_RECOVERING",
	[DLM_MIGRATING] =		"DLM_MIGRATING",
	[DLM_MAXSTATS] =		"DLM_MAXSTATS",
};

static const char *dlm_errmsgs[] = {
	[DLM_NORMAL] = 			"request in progress",
	[DLM_GRANTED] = 		"request granted",
	[DLM_DENIED] = 			"request denied",
	[DLM_DENIED_NOLOCKS] = 		"request denied, out of system resources",
	[DLM_WORKING] = 		"async request in progress",
	[DLM_BLOCKED] = 		"lock request blocked",
	[DLM_BLOCKED_ORPHAN] = 		"lock request blocked by a orphan lock",
	[DLM_DENIED_GRACE_PERIOD] = 	"topological change in progress",
	[DLM_SYSERR] = 			"system error",
	[DLM_NOSUPPORT] = 		"unsupported",
	[DLM_CANCELGRANT] = 		"can't cancel convert: already granted",
	[DLM_IVLOCKID] = 		"bad lockid",
	[DLM_SYNC] = 			"synchronous request granted",
	[DLM_BADTYPE] = 		"bad resource type",
	[DLM_BADRESOURCE] = 		"bad resource handle",
	[DLM_MAXHANDLES] = 		"no more resource handles",
	[DLM_NOCLINFO] = 		"can't contact cluster manager",
	[DLM_NOLOCKMGR] = 		"can't contact lock manager",
	[DLM_NOPURGED] = 		"can't contact purge daemon",
	[DLM_BADARGS] = 		"bad api args",
	[DLM_VOID] = 			"no status",
	[DLM_NOTQUEUED] = 		"NOQUEUE was specified and request failed",
	[DLM_IVBUFLEN] = 		"invalid resource name length",
	[DLM_CVTUNGRANT] = 		"attempted to convert ungranted lock",
	[DLM_BADPARAM] = 		"invalid lock mode specified",
	[DLM_VALNOTVALID] = 		"value block has been invalidated",
	[DLM_REJECTED] = 		"request rejected, unrecognized client",
	[DLM_ABORT] = 			"blocked lock request cancelled",
	[DLM_CANCEL] = 			"conversion request cancelled",
	[DLM_IVRESHANDLE] = 		"invalid resource handle",
	[DLM_DEADLOCK] = 		"deadlock recovery refused this request",
	[DLM_DENIED_NOASTS] = 		"failed to allocate AST",
	[DLM_FORWARD] = 		"request must wait for primary's response",
	[DLM_TIMEOUT] = 		"timeout value for lock has expired",
	[DLM_IVGROUPID] = 		"invalid group specification",
	[DLM_VERS_CONFLICT] = 		"version conflicts prevent request handling",
	[DLM_BAD_DEVICE_PATH] = 	"Locks device does not exist or path wrong",
	[DLM_NO_DEVICE_PERMISSION] = 	"Client has insufficient perms for device",
	[DLM_NO_CONTROL_DEVICE] = 	"Cannot set options on opened device ",
	[DLM_RECOVERING] = 		"lock resource being recovered",
	[DLM_MIGRATING] = 		"lock resource being migrated",
	[DLM_MAXSTATS] = 		"invalid error number",
};

const char *dlm_errmsg(enum dlm_status err)
{
	if (err >= DLM_MAXSTATS || err < 0)
		return dlm_errmsgs[DLM_MAXSTATS];
	return dlm_errmsgs[err];
}
EXPORT_SYMBOL_GPL(dlm_errmsg);

const char *dlm_errname(enum dlm_status err)
{
	if (err >= DLM_MAXSTATS || err < 0)
		return dlm_errnames[DLM_MAXSTATS];
	return dlm_errnames[err];
}
EXPORT_SYMBOL_GPL(dlm_errname);

/* NOTE: This function converts a lockname into a string. It uses knowledge
 * of the format of the lockname that should be outside the purview of the dlm.
 * We are adding only to make dlm debugging slightly easier.
 *
 * For more on lockname formats, please refer to dlmglue.c and ocfs2_lockid.h.
 */
static int stringify_lockname(const char *lockname, int locklen, char *buf,
			      int len)
{
	int out = 0;
	__be64 inode_blkno_be;

#define OCFS2_DENTRY_LOCK_INO_START	18
	if (*lockname == 'N') {
		memcpy((__be64 *)&inode_blkno_be,
		       (char *)&lockname[OCFS2_DENTRY_LOCK_INO_START],
		       sizeof(__be64));
		out += snprintf(buf + out, len - out, "%.*s%08x",
				OCFS2_DENTRY_LOCK_INO_START - 1, lockname,
				(unsigned int)be64_to_cpu(inode_blkno_be));
	} else
		out += snprintf(buf + out, len - out, "%.*s",
				locklen, lockname);
	return out;
}

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 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;
}

void dlm_print_one_mle(struct dlm_master_list_entry *mle)
{
	char *buf;

	buf = (char *) get_zeroed_page(GFP_NOFS);
	if (buf) {
		dump_mle(mle, buf, PAGE_SIZE - 1);
		free_page((unsigned long)buf);
	}
}

#ifdef CONFIG_DEBUG_FS

static struct dentry *dlm_debugfs_root = NULL;

#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"
#define DLM_DEBUGFS_PURGE_LIST			"purge_list"

/* 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);
}

static 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 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 - purge list funcs */
static int debug_purgelist_print(struct dlm_ctxt *dlm, struct debug_buffer *db)
{
	struct dlm_lock_resource *res;
	int out = 0;
	unsigned long total = 0;

	out += snprintf(db->buf + out, db->len - out,
			"Dumping Purgelist for Domain: %s\n", dlm->name);

	spin_lock(&dlm->spinlock);
	list_for_each_entry(res, &dlm->purge_list, purge) {
		++total;
		if (db->len - out < 100)
			continue;
		spin_lock(&res->spinlock);
		out += stringify_lockname(res->lockname.name,
					  res->lockname.len,
					  db->buf + out, db->len - out);
		out += snprintf(db->buf + out, db->len - out, "\t%ld\n",
				(jiffies - res->last_used)/HZ);
		spin_unlock(&res->spinlock);
	}
	spin_unlock(&dlm->spinlock);

	out += snprintf(db->buf + out, db->len - out,
			"Total on list: %ld\n", total);

	return out;
}

static int debug_purgelist_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_purgelist_print(dlm, db);

	file->private_data = db;

	return 0;
bail:
	return -ENOMEM;
}

static struct file_operations debug_purgelist_fops = {
	.open =		debug_purgelist_open,
	.release =	debug_buffer_release,
	.read =		debug_buffer_read,
	.llseek =	debug_buffer_llseek,
};
/* end - purge list funcs */

/* begin - debug mle funcs */
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,