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linux/fs/ocfs2/dlm/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/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));
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;
char *mle_type;
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(mle->mname, mle->mnamelen, 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 int debug_release(struct inode *inode, struct file *file)
{
free_page((unsigned long)file->private_data);
return 0;
}
static ssize_t 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));
}
/* end - util funcs */
/* begin - purge list funcs */
static int debug_purgelist_print(struct dlm_ctxt *dlm, char *buf, int len)
{
struct dlm_lock_resource *res;
int out = 0;
unsigned long total = 0;
out += snprintf(buf + out, 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 (len - out < 100)
continue;
spin_lock(&res->spinlock);
out += stringify_lockname(res->lockname.name,
res->lockname.len,
buf + out, len - out);
out += snprintf(buf + out, len - out, "\t%ld\n",
(jiffies - res->last_used)/HZ);
spin_unlock(&res->spinlock);
}
spin_unlock(&dlm->spinlock);
out += snprintf(buf + out, 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;
char *buf = NULL;
buf = (char *) get_zeroed_page(GFP_NOFS);
if (!buf)
goto bail;
i_size_write(inode, debug_purgelist_print(dlm, buf, PAGE_SIZE - 1));
file->private_data = buf;
return 0;
bail:
return -ENOMEM;
}
static const struct file_operations debug_purgelist_fops = {
.open = debug_purgelist_open,
.release = debug_release,
.read = debug_read,
.llseek = generic_file_llseek,
};
/* end - purge list funcs */
/* begin - debug mle funcs */
static int debug_mle_print(struct dlm_ctxt *dlm, char *buf, int len)
{
struct dlm_master_list_entry *mle;
struct hlist_head *bucket;
struct hlist_node *list;
int i, out = 0;
unsigned long total = 0, longest = 0, bucket_count = 0;
out += snprintf(buf + out, len - out,
"Dumping MLEs for Domain: %s\n", dlm->name);
spin_lock(&dlm->master_lock);
for (i = 0; i < DLM_HASH_BUCKETS; i++) {
bucket = dlm_master_hash(dlm, i);
hlist_for_each(list, bucket) {
mle = hlist_entry(list, struct dlm_master_list_entry,
master_hash_node);
++total;
++bucket_count;
if (len - out < 200)
continue;
out += dump_mle(mle, buf + out, len - out);
}
longest = max(longest, bucket_count);
bucket_count = 0;
}
spin_unlock(&dlm->master_lock);
out += snprintf(buf + out, len - out,
"Total: %ld, Longest: %ld\n", total, longest);
return out;
}
static int debug_mle_open(struct inode *inode, struct file *file)
{
struct dlm_ctxt *dlm = inode->i_private;
char *buf = NULL;
buf = (char *) get_zeroed_page(GFP_NOFS);
if (!buf)
goto bail;
i_size_write(inode, debug_mle_print(dlm, buf, PAGE_SIZE - 1));
file->private_data = buf;
return 0;
bail:
return -ENOMEM;
}
static const struct file_operations debug_mle_fops = {
.open = debug_mle_open,
.release = debug_release,
.read = debug_read,
.llseek = generic_file_llseek,
};
/* end - debug mle funcs */
/* begin - debug lockres funcs */
static int dump_lock(struct dlm_lock *lock, int list_type, char *buf, int len)
{
int out;
#define DEBUG_LOCK_VERSION 1
spin_lock(&lock->spinlock);
out = snprintf(buf, len, "LOCK:%d,%d,%d,%d,%d,%d:%lld,%d,%d,%d,%d,%d,"
"%d,%d,%d,%d\n",
DEBUG_LOCK_VERSION,
list_type, 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)),
!list_empty(&lock->ast_list),
!list_empty(&lock->bast_list),
lock->ast_pending, lock->bast_pending,
lock->convert_pending, lock->lock_pending,
lock->cancel_pending, lock->unlock_pending,
atomic_read(&lock->lock_refs.refcount));
spin_unlock(&lock->spinlock);
return out;
}
static int dump_lockres(struct dlm_lock_resource *res, char *buf, int len)
{
struct dlm_lock *lock;
int i;
int out = 0;
out += snprintf(buf + out, len - out, "NAME:");
out += stringify_lockname(res->lockname.name, res->lockname.len,
buf + out, len - out);
out += snprintf(buf + out, len - out, "\n");
#define DEBUG_LRES_VERSION 1
out += snprintf(buf + out, len - out,
"LRES:%d,%d,%d,%ld,%d,%d,%d,%d,%d,%d,%d\n",
DEBUG_LRES_VERSION,
res->owner, res->state, res->last_used,
!list_empty(&res->purge),
!list_empty(&res->dirty),
!list_empty(&res->recovering),
res->inflight_locks, res->migration_pending,
atomic_read(&res->asts_reserved),
atomic_read(&res->refs.refcount));
/* refmap */
out += snprintf(buf + out, len - out, "RMAP:");
out += stringify_nodemap(res->refmap, O2NM_MAX_NODES,
buf + out, len - out);
out += snprintf(buf + out, len - out, "\n");
/* lvb */
out += snprintf(buf + out, len - out, "LVBX:");
for (i = 0; i < DLM_LVB_LEN; i++)
out += snprintf(buf + out, len - out,
"%02x", (unsigned char)res->lvb[i]);
out += snprintf(buf + out, len - out, "\n");
/* granted */
list_for_each_entry(lock, &res->granted, list)
out += dump_lock(lock, 0, buf + out, len - out);
/* converting */
list_for_each_entry(lock, &res->converting, list)
out += dump_lock(lock, 1, buf + out, len - out);
/* blocked */
list_for_each_entry(lock, &res->blocked, list)
out += dump_lock(lock, 2, buf + out, len - out);
out += snprintf(buf + out, len - out, "\n");
return out;
}
static void *lockres_seq_start(struct seq_file *m, loff_t *pos)
{
struct debug_lockres *dl = m->private;
struct dlm_ctxt *dlm = dl->dl_ctxt;
struct dlm_lock_resource *oldres = dl->dl_res;
struct dlm_lock_resource *res = NULL;
struct list_head *track_list;
spin_lock(&dlm->track_lock);
if (oldres)
track_list = &oldres->tracking;
else {
track_list = &dlm->tracking_list;
if (list_empty(track_list)) {
dl = NULL;
spin_unlock(&dlm->track_lock);
goto bail;
}
}
list_for_each_entry(res, track_list, tracking) {
if (&res->tracking == &dlm->tracking_list)
res = NULL;
else
dlm_lockres_get(res);
break;
}
spin_unlock(&dlm->track_lock);
if (oldres)
dlm_lockres_put(oldres);
dl->dl_res = res;
if (res) {
spin_lock(&res->spinlock);
dump_lockres(res, dl->dl_buf, dl->dl_len - 1);
spin_unlock(&res->spinlock);
} else
dl = NULL;
bail:
/* passed to seq_show */
return dl;
}
static void lockres_seq_stop(struct seq_file *m, void *v)
{
}
static void *lockres_seq_next(struct seq_file *m, void *v, loff_t *pos)
{
return NULL;
}
static int lockres_seq_show(struct seq_file *s, void *v)
{
struct debug_lockres *dl = (struct debug_lockres *)v;
seq_printf(s, "%s", dl->dl_buf);
return 0;
}
static const struct seq_operations debug_lockres_ops = {
.start = lockres_seq_start,
.stop = lockres_seq_stop,
.next = lockres_seq_next,
.show = lockres_seq_show,
};
static int debug_lockres_open(struct inode *inode, struct file *file)
{
struct dlm_ctxt *dlm = inode->i_private;
int ret = -ENOMEM;
struct seq_file *seq;
struct debug_lockres *dl = NULL;
dl = kzalloc(sizeof(struct debug_lockres), GFP_KERNEL);
if (!dl) {
mlog_errno(ret);
goto bail;
}
dl->dl_len = PAGE_SIZE;
dl->dl_buf = kmalloc(dl->dl_len, GFP_KERNEL);
if (!dl->dl_buf) {
mlog_errno(ret);
goto bail;
}
ret = seq_open(file, &debug_lockres_ops);
if (ret) {
mlog_errno(ret);
goto bail;
}
seq = file->private_data;
seq->private = dl;
dlm_grab(dlm);
dl->dl_ctxt = dlm;
return 0;
bail:
if (dl)
kfree(dl->dl_buf);
kfree(dl);
return ret;
}
static int debug_lockres_release(struct inode *inode, struct file *file)
{
struct seq_file *seq = file->private_data;
struct debug_lockres *dl = (struct debug_lockres *)seq->private;
if (dl->dl_res)
dlm_lockres_put(dl->dl_res);
dlm_put(dl->dl_ctxt);
kfree(dl->dl_buf);
return seq_release_private(inode, file);
}
static const struct file_operations debug_lockres_fops = {
.open = debug_lockres_open,
.release = debug_lockres_release,
.read = seq_read,
.llseek = seq_lseek,
};
/* end - debug lockres funcs */
/* begin - debug state funcs */
static int debug_state_print(struct dlm_ctxt *dlm, char *buf, int len)
{
int out = 0;
struct dlm_reco_node_data *node;
char *state;
int cur_mles = 0, tot_mles = 0;
int i;
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(buf + out, len - out,
"Domain: %s Key: 0x%08x Protocol: %d.%d\n",
dlm->name, dlm->key, dlm->dlm_locking_proto.pv_major,
dlm->dlm_locking_proto.pv_minor);
/* Thread Pid: xxx Node: xxx State: xxxxx */
out += snprintf(buf + out, len - out,
"Thread Pid: %d Node: %d State: %s\n",
task_pid_nr(dlm->dlm_thread_task), dlm->node_num, state);
/* Number of Joins: xxx Joining Node: xxx */
out += snprintf(buf + out, len - out,
"Number of Joins: %d Joining Node: %d\n",
dlm->num_joins, dlm->joining_node);
/* Domain Map: xx xx xx */
out += snprintf(buf + out, len - out, "Domain Map: ");
out += stringify_nodemap(dlm->domain_map, O2NM_MAX_NODES,
buf + out, len - out);
out += snprintf(buf + out, len - out, "\n");
/* Live Map: xx xx xx */
out += snprintf(buf + out, len - out, "Live Map: ");
out += stringify_nodemap(dlm->live_nodes_map, O2NM_MAX_NODES,
buf + out, len - out);
out += snprintf(buf + out, len - out, "\n");
/* Lock Resources: xxx (xxx) */
out += snprintf(buf + out, len - out,
"Lock Resources: %d (%d)\n",
atomic_read(&dlm->res_cur_count),
atomic_read(&dlm->res_tot_count));
for (i = 0; i < DLM_MLE_NUM_TYPES; ++i)
tot_mles += atomic_read(&dlm->mle_tot_count[i]);
for (i = 0; i < DLM_MLE_NUM_TYPES; ++i)
cur_mles += atomic_read(&dlm->mle_cur_count[i]);
/* MLEs: xxx (xxx) */
out += snprintf(buf + out, len - out,
"MLEs: %d (%d)\n", cur_mles, tot_mles);
/* Blocking: xxx (xxx) */
out += snprintf(buf + out, len - out,
" Blocking: %d (%d)\n",
atomic_read(&dlm->mle_cur_count[DLM_MLE_BLOCK]),
atomic_read(&dlm->mle_tot_count[DLM_MLE_BLOCK]));
/* Mastery: xxx (xxx) */
out += snprintf(buf + out, len - out,
" Mastery: %d (%d)\n",
atomic_read(&dlm->mle_cur_count[DLM_MLE_MASTER]),
atomic_read(&dlm->mle_tot_count[DLM_MLE_MASTER]));
/* Migration: xxx (xxx) */
out += snprintf(buf + out, len - out,
" Migration: %d (%d)\n",
atomic_read(&dlm->mle_cur_count[DLM_MLE_MIGRATION]),
atomic_read(&dlm->mle_tot_count[DLM_MLE_MIGRATION]));
/* Lists: Dirty=Empty Purge=InUse PendingASTs=Empty ... */
out += snprintf(buf + out, len - out,
"Lists: Dirty=%s Purge=%s PendingASTs=%s "
"PendingBASTs=%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"));
/* Purge Count: xxx Refs: xxx */
out += snprintf(buf + out, len - out,
"Purge Count: %d Refs: %d\n", dlm->purge_count,
atomic_read(&dlm->dlm_refs.refcount));
/* Dead Node: xxx */
out += snprintf(buf + out, 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(buf + out, len - out,
"Recovery Pid: %d Master: %d State: %s\n",
task_pid_nr(dlm->dlm_reco_thread_task),
dlm->reco.new_master, state);
/* Recovery Map: xx xx */
out += snprintf(buf + out, len - out, "Recovery Map: ");
out += stringify_nodemap(dlm->recovery_map, O2NM_MAX_NODES,
buf + out, len - out);
out += snprintf(buf + out, len - out, "\n");
/* Recovery Node State: */
out += snprintf(buf + out, 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(buf + out, 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;
char *buf = NULL;
buf = (char *) get_zeroed_page(GFP_NOFS);
if (!buf)
goto bail;
i_size_write(inode, debug_state_print(dlm, buf, PAGE_SIZE - 1));
file->private_data = buf;
return 0;
bail:
return -ENOMEM;
}
static const struct file_operations debug_state_fops = {
.open = debug_state_open,
.release = debug_release,
.read = debug_read,
.llseek = generic_file_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;
}
/* for dumping lockres */
dc->debug_lockres_dentry =
debugfs_create_file(DLM_DEBUGFS_LOCKING_STATE,
S_IFREG|S_IRUSR,
dlm->dlm_debugfs_subroot,
dlm, &debug_lockres_fops);
if (!dc->debug_lockres_dentry) {
mlog_errno(-ENOMEM);
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;
}
/* for dumping lockres on the purge list */
dc->debug_purgelist_dentry =
debugfs_create_file(DLM_DEBUGFS_PURGE_LIST,
S_IFREG|S_IRUSR,
dlm->dlm_debugfs_subroot,
dlm, &debug_purgelist_fops);
if (!dc->debug_purgelist_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) {
debugfs_remove(dc->debug_purgelist_dentry);
debugfs_remove(dc->debug_mle_dentry);
debugfs_remove(dc->debug_lockres_dentry);
debugfs_remove(dc->debug_state_dentry);
dlm_debug_put(dc);
}
}
/* subroot - domain dir */
int dlm_create_debugfs_subroot(struct dlm_ctxt *dlm)
{
dlm->dlm_debugfs_subroot = debugfs_create_dir(dlm->name,
dlm_debugfs_root);
if (!dlm->dlm_debugfs_subroot) {
mlog_errno(-ENOMEM);
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);
return -ENOMEM;
}
void dlm_destroy_debugfs_subroot(struct dlm_ctxt *dlm)
{
debugfs_remove(dlm->dlm_debugfs_subroot);
}
/* debugfs root */
int dlm_create_debugfs_root(void)
{
dlm_debugfs_root = debugfs_create_dir(DLM_DEBUGFS_DIR, NULL);
if (!dlm_debugfs_root) {
mlog_errno(-ENOMEM);
return -ENOMEM;
}
return 0;
}
void dlm_destroy_debugfs_root(void)
{
debugfs_remove(dlm_debugfs_root);
}
#endif /* CONFIG_DEBUG_FS */
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