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