debug.c

来自「lustre 1.6.5 source code」· C语言 代码 · 共 833 行 · 第 1/2 页

/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
 * vim:expandtab:shiftwidth=8:tabstop=8:
 *
 * Copyright (C) 2002 Cluster File Systems, Inc.
 *   Author: Phil Schwan <[e-mail]>
 *
 *   This file is part of Lustre, http://www.lustre.org.
 *
 *   Lustre is free software; you can redistribute it and/or
 *   modify it under the terms of version 2 of the GNU General Public
 *   License as published by the Free Software Foundation.
 *
 *   Lustre 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 Lustre; if not, write to the Free Software
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef EXPORT_SYMTAB
# define EXPORT_SYMTAB
#endif

# define DEBUG_SUBSYSTEM S_LNET

#include <stdarg.h>
#include <libcfs/kp30.h>
#include <libcfs/libcfs.h>
#include "tracefile.h"

static char debug_file_name[1024];

#ifdef __KERNEL__
unsigned int libcfs_subsystem_debug = ~0;
CFS_MODULE_PARM(libcfs_subsystem_debug, "i", int, 0644,
                "Lustre kernel debug subsystem mask");
EXPORT_SYMBOL(libcfs_subsystem_debug);

unsigned int libcfs_debug = (D_EMERG | D_ERROR | D_WARNING | D_CONSOLE |
                             D_NETERROR | D_HA | D_CONFIG | D_IOCTL);
CFS_MODULE_PARM(libcfs_debug, "i", int, 0644,
                "Lustre kernel debug mask");
EXPORT_SYMBOL(libcfs_debug);

int libcfs_debug_mb = -1;
CFS_MODULE_PARM(libcfs_debug_mb, "i", int, 0644,
                "Total debug buffer size.");
EXPORT_SYMBOL(libcfs_debug_mb);

unsigned int libcfs_printk = D_CANTMASK;
CFS_MODULE_PARM(libcfs_printk, "i", uint, 0644,
                "Lustre kernel debug console mask");
EXPORT_SYMBOL(libcfs_printk);

unsigned int libcfs_console_ratelimit = 1;
CFS_MODULE_PARM(libcfs_console_ratelimit, "i", uint, 0644,
                "Lustre kernel debug console ratelimit (0 to disable)");
EXPORT_SYMBOL(libcfs_console_ratelimit);

cfs_duration_t libcfs_console_max_delay;
CFS_MODULE_PARM(libcfs_console_max_delay, "l", ulong, 0644,
                "Lustre kernel debug console max delay (jiffies)");
EXPORT_SYMBOL(libcfs_console_max_delay);

cfs_duration_t libcfs_console_min_delay;
CFS_MODULE_PARM(libcfs_console_min_delay, "l", ulong, 0644,
                "Lustre kernel debug console min delay (jiffies)");
EXPORT_SYMBOL(libcfs_console_min_delay);

unsigned int libcfs_console_backoff = CDEBUG_DEFAULT_BACKOFF;
CFS_MODULE_PARM(libcfs_console_backoff, "i", uint, 0644,
                "Lustre kernel debug console backoff factor");
EXPORT_SYMBOL(libcfs_console_backoff);

unsigned int libcfs_debug_binary = 1;
EXPORT_SYMBOL(libcfs_debug_binary);

unsigned int libcfs_stack;
EXPORT_SYMBOL(libcfs_stack);

unsigned int portal_enter_debugger;
EXPORT_SYMBOL(portal_enter_debugger);

unsigned int libcfs_catastrophe;
EXPORT_SYMBOL(libcfs_catastrophe);

unsigned int libcfs_panic_on_lbug = 0;
CFS_MODULE_PARM(libcfs_panic_on_lbug, "i", uint, 0644,
                "Lustre kernel panic on LBUG");
EXPORT_SYMBOL(libcfs_panic_on_lbug);

atomic_t libcfs_kmemory = ATOMIC_INIT(0);
EXPORT_SYMBOL(libcfs_kmemory);

static cfs_waitq_t debug_ctlwq;

#ifdef __arch_um__
char debug_file_path[1024] = "/r/tmp/lustre-log";
#else
char debug_file_path[1024] = "/tmp/lustre-log";
#endif

int libcfs_panic_in_progress;

/* libcfs_debug_token2mask() expects the returned
 * string in lower-case */
const char *
libcfs_debug_subsys2str(int subsys)
{
        switch (subsys) {
        default:
                return NULL;
        case S_UNDEFINED:
                return "undefined";
        case S_MDC:
                return "mdc";
        case S_MDS:
                return "mds";
        case S_OSC:
                return "osc";
        case S_OST:
                return "ost";
        case S_CLASS:
                return "class";
        case S_LOG:
                return "log";
        case S_LLITE:
                return "llite";
        case S_RPC:
                return "rpc";
        case S_LNET:
                return "lnet";
        case S_LND:
                return "lnd";
        case S_PINGER:
                return "pinger";
        case S_FILTER:
                return "filter";
        case S_ECHO:
                return "echo";
        case S_LDLM:
                return "ldlm";
        case S_LOV:
                return "lov";
        case S_LMV:
                return "lmv";
        case S_SEC:
                return "sec";
        case S_GSS:
                return "gss";
        case S_MGC:
                return "mgc";
        case S_MGS:
                return "mgs";
        case S_FID:
                return "fid";
        case S_FLD:
                return "fld";
        }
}

/* libcfs_debug_token2mask() expects the returned
 * string in lower-case */
const char *
libcfs_debug_dbg2str(int debug)
{
        switch (debug) {
        default:
                return NULL;
        case D_TRACE:
                return "trace";
        case D_INODE:
                return "inode";
        case D_SUPER:
                return "super";
        case D_EXT2:
                return "ext2";
        case D_MALLOC:
                return "malloc";
        case D_CACHE:
                return "cache";
        case D_INFO:
                return "info";
        case D_IOCTL:
                return "ioctl";
        case D_NETERROR:
                return "neterror";
        case D_NET:
                return "net";
        case D_WARNING:
                return "warning";
        case D_BUFFS:
                return "buffs";
        case D_OTHER:
                return "other";
        case D_DENTRY:
                return "dentry";
        case D_NETTRACE:
                return "nettrace";
        case D_PAGE:
                return "page";
        case D_DLMTRACE:
                return "dlmtrace";
        case D_ERROR:
                return "error";
        case D_EMERG:
                return "emerg";
        case D_HA:
                return "ha";
        case D_RPCTRACE:
                return "rpctrace";
        case D_VFSTRACE:
                return "vfstrace";
        case D_READA:
                return "reada";
        case D_MMAP:
                return "mmap";
        case D_CONFIG:
                return "config";
        case D_CONSOLE:
                return "console";
        case D_QUOTA:
                return "quota";
        case D_SEC:
                return "sec";
        }
}

int
libcfs_debug_mask2str(char *str, int size, int mask, int is_subsys)
{
        const char *(*fn)(int bit) = is_subsys ? libcfs_debug_subsys2str :
                                                 libcfs_debug_dbg2str;
        int           len = 0;
        const char   *token;
        int           bit;
        int           i;

        if (mask == 0) {                        /* "0" */
                if (size > 0)
                        str[0] = '0';
                len = 1;
        } else {                                /* space-separated tokens */
                for (i = 0; i < 32; i++) {
                        bit = 1 << i;

                        if ((mask & bit) == 0)
                                continue;

                        token = fn(bit);
                        if (token == NULL)              /* unused bit */
                                continue;

                        if (len > 0) {                  /* separator? */
                                if (len < size)
                                        str[len] = ' ';
                                len++;
                        }

                        while (*token != 0) {
                                if (len < size)
                                        str[len] = *token;
                                token++;
                                len++;
                        }
                }
        }

        /* terminate 'str' */
        if (len < size)
                str[len] = 0;
        else
                str[size - 1] = 0;

        return len;
}

int
libcfs_debug_token2mask(int *mask, const char *str, int len, int is_subsys)
{
        const char *(*fn)(int bit) = is_subsys ? libcfs_debug_subsys2str :
                                                 libcfs_debug_dbg2str;
        int           i;
        int           j;
        int           bit;
        const char   *token;

        /* match against known tokens */
        for (i = 0; i < 32; i++) {
                bit = 1 << i;

                token = fn(bit);
                if (token == NULL)              /* unused? */
                        continue;

                /* strcasecmp */
                for (j = 0; ; j++) {
                        if (j == len) {         /* end of token */
                                if (token[j] == 0) {
                                        *mask = bit;
                                        return 0;
                                }
                                break;
                        }

                        if (token[j] == 0)
                                break;

                        if (str[j] == token[j])
                                continue;

                        if (str[j] < 'A' || 'Z' < str[j])
                                break;

                        if (str[j] - 'A' + 'a' != token[j])
                                break;
                }
        }

        return -EINVAL;                         /* no match */
}

int
libcfs_debug_str2mask(int *mask, const char *str, int is_subsys)
{
        int         m = 0;
        char        op = 0;
        int         matched;
        int         n;
        int         t;

        /* Allow a number for backwards compatibility */

        for (n = strlen(str); n > 0; n--)
                if (!isspace(str[n-1]))
                        break;
        matched = n;

        if ((t = sscanf(str, "%i%n", &m, &matched)) >= 1 &&
            matched == n) {
                *mask = m;
                return 0;
        }

        /* <str> must be a list of debug tokens or numbers separated by
         * whitespace and optionally an operator ('+' or '-').  If an operator
         * appears first in <str>, '*mask' is used as the starting point
         * (relative), otherwise 0 is used (absolute).  An operator applies to
         * all following tokens up to the next operator. */

        matched = 0;
        while (*str != 0) {
                while (isspace(*str)) /* skip whitespace */
                        str++;

                if (*str == 0)
                        break;

                if (*str == '+' || *str == '-') {
                        op = *str++;

                        /* op on first token == relative */
                        if (!matched)
                                m = *mask;

                        while (isspace(*str)) /* skip whitespace */
                                str++;

                        if (*str == 0)          /* trailing op */
                                return -EINVAL;
                }

                /* find token length */
                for (n = 0; str[n] != 0 && !isspace(str[n]); n++);

                /* match token */
                if (libcfs_debug_token2mask(&t, str, n, is_subsys) != 0)
                        return -EINVAL;

                matched = 1;
                if (op == '-')
                        m &= ~t;
                else
                        m |= t;

                str += n;
        }

        if (!matched)
                return -EINVAL;

        *mask = m;
        return 0;
}

void libcfs_debug_dumplog_internal(void *arg)
{
        CFS_DECL_JOURNAL_DATA;

        CFS_PUSH_JOURNAL;

        snprintf(debug_file_name, sizeof(debug_file_path) - 1, "%s.%ld.%ld",
                 debug_file_path, cfs_time_current_sec(), (long)arg);
        printk(KERN_ALERT "LustreError: dumping log to %s\n", debug_file_name);
        tracefile_dump_all_pages(debug_file_name);

        CFS_POP_JOURNAL;
}

int libcfs_debug_dumplog_thread(void *arg)
{
        cfs_daemonize("");
        libcfs_debug_dumplog_internal(arg);
        cfs_waitq_signal(&debug_ctlwq);