linux/fs/xfs/xfs_error.c
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   1/*
   2 * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
   3 * All Rights Reserved.
   4 *
   5 * This program is free software; you can redistribute it and/or
   6 * modify it under the terms of the GNU General Public License as
   7 * published by the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope that it would be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 * GNU General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program; if not, write the Free Software Foundation,
  16 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17 */
  18#include "xfs.h"
  19#include "xfs_fs.h"
  20#include "xfs_types.h"
  21#include "xfs_log.h"
  22#include "xfs_trans.h"
  23#include "xfs_sb.h"
  24#include "xfs_ag.h"
  25#include "xfs_mount.h"
  26#include "xfs_bmap_btree.h"
  27#include "xfs_dinode.h"
  28#include "xfs_inode.h"
  29#include "xfs_utils.h"
  30#include "xfs_error.h"
  31
  32#ifdef DEBUG
  33
  34int     xfs_etrap[XFS_ERROR_NTRAP] = {
  35        0,
  36};
  37
  38int
  39xfs_error_trap(int e)
  40{
  41        int i;
  42
  43        if (!e)
  44                return 0;
  45        for (i = 0; i < XFS_ERROR_NTRAP; i++) {
  46                if (xfs_etrap[i] == 0)
  47                        break;
  48                if (e != xfs_etrap[i])
  49                        continue;
  50                xfs_notice(NULL, "%s: error %d", __func__, e);
  51                BUG();
  52                break;
  53        }
  54        return e;
  55}
  56
  57int     xfs_etest[XFS_NUM_INJECT_ERROR];
  58int64_t xfs_etest_fsid[XFS_NUM_INJECT_ERROR];
  59char *  xfs_etest_fsname[XFS_NUM_INJECT_ERROR];
  60int     xfs_error_test_active;
  61
  62int
  63xfs_error_test(int error_tag, int *fsidp, char *expression,
  64               int line, char *file, unsigned long randfactor)
  65{
  66        int i;
  67        int64_t fsid;
  68
  69        if (prandom_u32() % randfactor)
  70                return 0;
  71
  72        memcpy(&fsid, fsidp, sizeof(xfs_fsid_t));
  73
  74        for (i = 0; i < XFS_NUM_INJECT_ERROR; i++)  {
  75                if (xfs_etest[i] == error_tag && xfs_etest_fsid[i] == fsid) {
  76                        xfs_warn(NULL,
  77        "Injecting error (%s) at file %s, line %d, on filesystem \"%s\"",
  78                                expression, file, line, xfs_etest_fsname[i]);
  79                        return 1;
  80                }
  81        }
  82
  83        return 0;
  84}
  85
  86int
  87xfs_errortag_add(int error_tag, xfs_mount_t *mp)
  88{
  89        int i;
  90        int len;
  91        int64_t fsid;
  92
  93        memcpy(&fsid, mp->m_fixedfsid, sizeof(xfs_fsid_t));
  94
  95        for (i = 0; i < XFS_NUM_INJECT_ERROR; i++)  {
  96                if (xfs_etest_fsid[i] == fsid && xfs_etest[i] == error_tag) {
  97                        xfs_warn(mp, "error tag #%d on", error_tag);
  98                        return 0;
  99                }
 100        }
 101
 102        for (i = 0; i < XFS_NUM_INJECT_ERROR; i++)  {
 103                if (xfs_etest[i] == 0) {
 104                        xfs_warn(mp, "Turned on XFS error tag #%d",
 105                                error_tag);
 106                        xfs_etest[i] = error_tag;
 107                        xfs_etest_fsid[i] = fsid;
 108                        len = strlen(mp->m_fsname);
 109                        xfs_etest_fsname[i] = kmem_alloc(len + 1, KM_SLEEP);
 110                        strcpy(xfs_etest_fsname[i], mp->m_fsname);
 111                        xfs_error_test_active++;
 112                        return 0;
 113                }
 114        }
 115
 116        xfs_warn(mp, "error tag overflow, too many turned on");
 117
 118        return 1;
 119}
 120
 121int
 122xfs_errortag_clearall(xfs_mount_t *mp, int loud)
 123{
 124        int64_t fsid;
 125        int cleared = 0;
 126        int i;
 127
 128        memcpy(&fsid, mp->m_fixedfsid, sizeof(xfs_fsid_t));
 129
 130
 131        for (i = 0; i < XFS_NUM_INJECT_ERROR; i++) {
 132                if ((fsid == 0LL || xfs_etest_fsid[i] == fsid) &&
 133                     xfs_etest[i] != 0) {
 134                        cleared = 1;
 135                        xfs_warn(mp, "Clearing XFS error tag #%d",
 136                                xfs_etest[i]);
 137                        xfs_etest[i] = 0;
 138                        xfs_etest_fsid[i] = 0LL;
 139                        kmem_free(xfs_etest_fsname[i]);
 140                        xfs_etest_fsname[i] = NULL;
 141                        xfs_error_test_active--;
 142                }
 143        }
 144
 145        if (loud || cleared)
 146                xfs_warn(mp, "Cleared all XFS error tags for filesystem");
 147
 148        return 0;
 149}
 150#endif /* DEBUG */
 151
 152void
 153xfs_error_report(
 154        const char              *tag,
 155        int                     level,
 156        struct xfs_mount        *mp,
 157        const char              *filename,
 158        int                     linenum,
 159        inst_t                  *ra)
 160{
 161        if (level <= xfs_error_level) {
 162                xfs_alert_tag(mp, XFS_PTAG_ERROR_REPORT,
 163                "Internal error %s at line %d of file %s.  Caller 0x%p\n",
 164                            tag, linenum, filename, ra);
 165
 166                xfs_stack_trace();
 167        }
 168}
 169
 170void
 171xfs_corruption_error(
 172        const char              *tag,
 173        int                     level,
 174        struct xfs_mount        *mp,
 175        void                    *p,
 176        const char              *filename,
 177        int                     linenum,
 178        inst_t                  *ra)
 179{
 180        if (level <= xfs_error_level)
 181                xfs_hex_dump(p, 64);
 182        xfs_error_report(tag, level, mp, filename, linenum, ra);
 183        xfs_alert(mp, "Corruption detected. Unmount and run xfs_repair");
 184}
 185
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