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