fs/xfs/xfs_error.c

   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_format.h"
  20 #include "xfs_fs.h"
  21 #include "xfs_log_format.h"
  22 #include "xfs_trans_resv.h"
  23 #include "xfs_mount.h"
  24 #include "xfs_error.h"
  25
  26 #ifdef DEBUG
  27
  28 int     xfs_etest[XFS_NUM_INJECT_ERROR];
  29 int64_t xfs_etest_fsid[XFS_NUM_INJECT_ERROR];
  30 char *  xfs_etest_fsname[XFS_NUM_INJECT_ERROR];
  31 int     xfs_error_test_active;
  32
  33 int
  34 xfs_error_test(int error_tag, int *fsidp, char *expression,
  35                int line, char *file, unsigned long randfactor)
  36 {
  37         int i;
  38         int64_t fsid;
  39
  40         if (prandom_u32() % randfactor)
  41                 return 0;
  42
  43         memcpy(&fsid, fsidp, sizeof(xfs_fsid_t));
  44
  45         for (i = 0; i < XFS_NUM_INJECT_ERROR; i++)  {
  46                 if (xfs_etest[i] == error_tag && xfs_etest_fsid[i] == fsid) {
  47                         xfs_warn(NULL,
  48         "Injecting error (%s) at file %s, line %d, on filesystem \"%s\"",
  49                                 expression, file, line, xfs_etest_fsname[i]);
  50                         return 1;
  51                 }
  52         }
  53
  54         return 0;
  55 }
  56
  57 int
  58 xfs_errortag_add(unsigned int error_tag, xfs_mount_t *mp)
  59 {
  60         int i;
  61         int len;
  62         int64_t fsid;
  63
  64         if (error_tag >= XFS_ERRTAG_MAX)
  65                 return -EINVAL;
  66
  67         memcpy(&fsid, mp->m_fixedfsid, sizeof(xfs_fsid_t));
  68
  69         for (i = 0; i < XFS_NUM_INJECT_ERROR; i++)  {
  70                 if (xfs_etest_fsid[i] == fsid && xfs_etest[i] == error_tag) {
  71                         xfs_warn(mp, "error tag #%d on", error_tag);
  72                         return 0;
  73                 }
  74         }
  75
  76         for (i = 0; i < XFS_NUM_INJECT_ERROR; i++)  {
  77                 if (xfs_etest[i] == 0) {
  78                         xfs_warn(mp, "Turned on XFS error tag #%d",
  79                                 error_tag);
  80                         xfs_etest[i] = error_tag;
  81                         xfs_etest_fsid[i] = fsid;
  82                         len = strlen(mp->m_fsname);
  83                         xfs_etest_fsname[i] = kmem_alloc(len + 1, KM_SLEEP);
  84                         strcpy(xfs_etest_fsname[i], mp->m_fsname);
  85                         xfs_error_test_active++;
  86                         return 0;
  87                 }
  88         }
  89
  90         xfs_warn(mp, "error tag overflow, too many turned on");
  91
  92         return 1;
  93 }
  94
  95 int
  96 xfs_errortag_clearall(xfs_mount_t *mp, int loud)
  97 {
  98         int64_t fsid;
  99         int cleared = 0;
 100         int i;
 101
 102         memcpy(&fsid, mp->m_fixedfsid, sizeof(xfs_fsid_t));
 103
 104
 105         for (i = 0; i < XFS_NUM_INJECT_ERROR; i++) {
 106                 if ((fsid == 0LL || xfs_etest_fsid[i] == fsid) &&
 107                      xfs_etest[i] != 0) {
 108                         cleared = 1;
 109                         xfs_warn(mp, "Clearing XFS error tag #%d",
 110                                 xfs_etest[i]);
 111                         xfs_etest[i] = 0;
 112                         xfs_etest_fsid[i] = 0LL;
 113                         kmem_free(xfs_etest_fsname[i]);
 114                         xfs_etest_fsname[i] = NULL;
 115                         xfs_error_test_active--;
 116                 }
 117         }
 118
 119         if (loud || cleared)
 120                 xfs_warn(mp, "Cleared all XFS error tags for filesystem");
 121
 122         return 0;
 123 }
 124 #endif /* DEBUG */
 125
 126 void
 127 xfs_error_report(
 128         const char              *tag,
 129         int                     level,
 130         struct xfs_mount        *mp,
 131         const char              *filename,
 132         int                     linenum,
 133         void                    *ra)
 134 {
 135         if (level <= xfs_error_level) {
 136                 xfs_alert_tag(mp, XFS_PTAG_ERROR_REPORT,
 137                 "Internal error %s at line %d of file %s.  Caller %pS",
 138                             tag, linenum, filename, ra);
 139
 140                 xfs_stack_trace();
 141         }
 142 }
 143
 144 void
 145 xfs_corruption_error(
 146         const char              *tag,
 147         int                     level,
 148         struct xfs_mount        *mp,
 149         void                    *p,
 150         const char              *filename,
 151         int                     linenum,
 152         void                    *ra)
 153 {
 154         if (level <= xfs_error_level)
 155                 xfs_hex_dump(p, 64);
 156         xfs_error_report(tag, level, mp, filename, linenum, ra);
 157         xfs_alert(mp, "Corruption detected. Unmount and run xfs_repair");
 158 }
 159
 160 /*
 161  * Warnings specifically for verifier errors.  Differentiate CRC vs. invalid
 162  * values, and omit the stack trace unless the error level is tuned high.
 163  */
 164 void
 165 xfs_verifier_error(
 166         struct xfs_buf          *bp)
 167 {
 168         struct xfs_mount *mp = bp->b_target->bt_mount;
 169
 170         xfs_alert(mp, "Metadata %s detected at %pF, %s block 0x%llx",
 171                   bp->b_error == -EFSBADCRC ? "CRC error" : "corruption",
 172                   __return_address, bp->b_ops->name, bp->b_bn);
 173
 174         xfs_alert(mp, "Unmount and run xfs_repair");
 175
 176         if (xfs_error_level >= XFS_ERRLEVEL_LOW) {
 177                 xfs_alert(mp, "First 64 bytes of corrupted metadata buffer:");
 178                 xfs_hex_dump(xfs_buf_offset(bp, 0), 64);
 179         }
 180
 181         if (xfs_error_level >= XFS_ERRLEVEL_HIGH)
 182                 xfs_stack_trace();
 183 }