fs/xfs/xfs_error.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6 #include "xfs.h"
   7 #include "xfs_format.h"
   8 #include "xfs_fs.h"
   9 #include "xfs_log_format.h"
  10 #include "xfs_trans_resv.h"
  11 #include "xfs_mount.h"
  12 #include "xfs_errortag.h"
  13 #include "xfs_error.h"
  14 #include "xfs_sysfs.h"
  15 #include "xfs_inode.h"
  16
  17 #ifdef DEBUG
  18
  19 static unsigned int xfs_errortag_random_default[] = {
  20         XFS_RANDOM_DEFAULT,
  21         XFS_RANDOM_IFLUSH_1,
  22         XFS_RANDOM_IFLUSH_2,
  23         XFS_RANDOM_IFLUSH_3,
  24         XFS_RANDOM_IFLUSH_4,
  25         XFS_RANDOM_IFLUSH_5,
  26         XFS_RANDOM_IFLUSH_6,
  27         XFS_RANDOM_DA_READ_BUF,
  28         XFS_RANDOM_BTREE_CHECK_LBLOCK,
  29         XFS_RANDOM_BTREE_CHECK_SBLOCK,
  30         XFS_RANDOM_ALLOC_READ_AGF,
  31         XFS_RANDOM_IALLOC_READ_AGI,
  32         XFS_RANDOM_ITOBP_INOTOBP,
  33         XFS_RANDOM_IUNLINK,
  34         XFS_RANDOM_IUNLINK_REMOVE,
  35         XFS_RANDOM_DIR_INO_VALIDATE,
  36         XFS_RANDOM_BULKSTAT_READ_CHUNK,
  37         XFS_RANDOM_IODONE_IOERR,
  38         XFS_RANDOM_STRATREAD_IOERR,
  39         XFS_RANDOM_STRATCMPL_IOERR,
  40         XFS_RANDOM_DIOWRITE_IOERR,
  41         XFS_RANDOM_BMAPIFORMAT,
  42         XFS_RANDOM_FREE_EXTENT,
  43         XFS_RANDOM_RMAP_FINISH_ONE,
  44         XFS_RANDOM_REFCOUNT_CONTINUE_UPDATE,
  45         XFS_RANDOM_REFCOUNT_FINISH_ONE,
  46         XFS_RANDOM_BMAP_FINISH_ONE,
  47         XFS_RANDOM_AG_RESV_CRITICAL,
  48         XFS_RANDOM_DROP_WRITES,
  49         XFS_RANDOM_LOG_BAD_CRC,
  50         XFS_RANDOM_LOG_ITEM_PIN,
  51         XFS_RANDOM_BUF_LRU_REF,
  52         XFS_RANDOM_FORCE_SCRUB_REPAIR,
  53         XFS_RANDOM_FORCE_SUMMARY_RECALC,
  54 };
  55
  56 struct xfs_errortag_attr {
  57         struct attribute        attr;
  58         unsigned int            tag;
  59 };
  60
  61 static inline struct xfs_errortag_attr *
  62 to_attr(struct attribute *attr)
  63 {
  64         return container_of(attr, struct xfs_errortag_attr, attr);
  65 }
  66
  67 static inline struct xfs_mount *
  68 to_mp(struct kobject *kobject)
  69 {
  70         struct xfs_kobj *kobj = to_kobj(kobject);
  71
  72         return container_of(kobj, struct xfs_mount, m_errortag_kobj);
  73 }
  74
  75 STATIC ssize_t
  76 xfs_errortag_attr_store(
  77         struct kobject          *kobject,
  78         struct attribute        *attr,
  79         const char              *buf,
  80         size_t                  count)
  81 {
  82         struct xfs_mount        *mp = to_mp(kobject);
  83         struct xfs_errortag_attr *xfs_attr = to_attr(attr);
  84         int                     ret;
  85         unsigned int            val;
  86
  87         if (strcmp(buf, "default") == 0) {
  88                 val = xfs_errortag_random_default[xfs_attr->tag];
  89         } else {
  90                 ret = kstrtouint(buf, 0, &val);
  91                 if (ret)
  92                         return ret;
  93         }
  94
  95         ret = xfs_errortag_set(mp, xfs_attr->tag, val);
  96         if (ret)
  97                 return ret;
  98         return count;
  99 }
 100
 101 STATIC ssize_t
 102 xfs_errortag_attr_show(
 103         struct kobject          *kobject,
 104         struct attribute        *attr,
 105         char                    *buf)
 106 {
 107         struct xfs_mount        *mp = to_mp(kobject);
 108         struct xfs_errortag_attr *xfs_attr = to_attr(attr);
 109
 110         return snprintf(buf, PAGE_SIZE, "%u\n",
 111                         xfs_errortag_get(mp, xfs_attr->tag));
 112 }
 113
 114 static const struct sysfs_ops xfs_errortag_sysfs_ops = {
 115         .show = xfs_errortag_attr_show,
 116         .store = xfs_errortag_attr_store,
 117 };
 118
 119 #define XFS_ERRORTAG_ATTR_RW(_name, _tag) \
 120 static struct xfs_errortag_attr xfs_errortag_attr_##_name = {           \
 121         .attr = {.name = __stringify(_name),                            \
 122                  .mode = VERIFY_OCTAL_PERMISSIONS(S_IWUSR | S_IRUGO) }, \
 123         .tag    = (_tag),                                               \
 124 }
 125
 126 #define XFS_ERRORTAG_ATTR_LIST(_name) &xfs_errortag_attr_##_name.attr
 127
 128 XFS_ERRORTAG_ATTR_RW(noerror,           XFS_ERRTAG_NOERROR);
 129 XFS_ERRORTAG_ATTR_RW(iflush1,           XFS_ERRTAG_IFLUSH_1);
 130 XFS_ERRORTAG_ATTR_RW(iflush2,           XFS_ERRTAG_IFLUSH_2);
 131 XFS_ERRORTAG_ATTR_RW(iflush3,           XFS_ERRTAG_IFLUSH_3);
 132 XFS_ERRORTAG_ATTR_RW(iflush4,           XFS_ERRTAG_IFLUSH_4);
 133 XFS_ERRORTAG_ATTR_RW(iflush5,           XFS_ERRTAG_IFLUSH_5);
 134 XFS_ERRORTAG_ATTR_RW(iflush6,           XFS_ERRTAG_IFLUSH_6);
 135 XFS_ERRORTAG_ATTR_RW(dareadbuf,         XFS_ERRTAG_DA_READ_BUF);
 136 XFS_ERRORTAG_ATTR_RW(btree_chk_lblk,    XFS_ERRTAG_BTREE_CHECK_LBLOCK);
 137 XFS_ERRORTAG_ATTR_RW(btree_chk_sblk,    XFS_ERRTAG_BTREE_CHECK_SBLOCK);
 138 XFS_ERRORTAG_ATTR_RW(readagf,           XFS_ERRTAG_ALLOC_READ_AGF);
 139 XFS_ERRORTAG_ATTR_RW(readagi,           XFS_ERRTAG_IALLOC_READ_AGI);
 140 XFS_ERRORTAG_ATTR_RW(itobp,             XFS_ERRTAG_ITOBP_INOTOBP);
 141 XFS_ERRORTAG_ATTR_RW(iunlink,           XFS_ERRTAG_IUNLINK);
 142 XFS_ERRORTAG_ATTR_RW(iunlinkrm,         XFS_ERRTAG_IUNLINK_REMOVE);
 143 XFS_ERRORTAG_ATTR_RW(dirinovalid,       XFS_ERRTAG_DIR_INO_VALIDATE);
 144 XFS_ERRORTAG_ATTR_RW(bulkstat,          XFS_ERRTAG_BULKSTAT_READ_CHUNK);
 145 XFS_ERRORTAG_ATTR_RW(logiodone,         XFS_ERRTAG_IODONE_IOERR);
 146 XFS_ERRORTAG_ATTR_RW(stratread,         XFS_ERRTAG_STRATREAD_IOERR);
 147 XFS_ERRORTAG_ATTR_RW(stratcmpl,         XFS_ERRTAG_STRATCMPL_IOERR);
 148 XFS_ERRORTAG_ATTR_RW(diowrite,          XFS_ERRTAG_DIOWRITE_IOERR);
 149 XFS_ERRORTAG_ATTR_RW(bmapifmt,          XFS_ERRTAG_BMAPIFORMAT);
 150 XFS_ERRORTAG_ATTR_RW(free_extent,       XFS_ERRTAG_FREE_EXTENT);
 151 XFS_ERRORTAG_ATTR_RW(rmap_finish_one,   XFS_ERRTAG_RMAP_FINISH_ONE);
 152 XFS_ERRORTAG_ATTR_RW(refcount_continue_update,  XFS_ERRTAG_REFCOUNT_CONTINUE_UPDATE);
 153 XFS_ERRORTAG_ATTR_RW(refcount_finish_one,       XFS_ERRTAG_REFCOUNT_FINISH_ONE);
 154 XFS_ERRORTAG_ATTR_RW(bmap_finish_one,   XFS_ERRTAG_BMAP_FINISH_ONE);
 155 XFS_ERRORTAG_ATTR_RW(ag_resv_critical,  XFS_ERRTAG_AG_RESV_CRITICAL);
 156 XFS_ERRORTAG_ATTR_RW(drop_writes,       XFS_ERRTAG_DROP_WRITES);
 157 XFS_ERRORTAG_ATTR_RW(log_bad_crc,       XFS_ERRTAG_LOG_BAD_CRC);
 158 XFS_ERRORTAG_ATTR_RW(log_item_pin,      XFS_ERRTAG_LOG_ITEM_PIN);
 159 XFS_ERRORTAG_ATTR_RW(buf_lru_ref,       XFS_ERRTAG_BUF_LRU_REF);
 160 XFS_ERRORTAG_ATTR_RW(force_repair,      XFS_ERRTAG_FORCE_SCRUB_REPAIR);
 161 XFS_ERRORTAG_ATTR_RW(bad_summary,       XFS_ERRTAG_FORCE_SUMMARY_RECALC);
 162
 163 static struct attribute *xfs_errortag_attrs[] = {
 164         XFS_ERRORTAG_ATTR_LIST(noerror),
 165         XFS_ERRORTAG_ATTR_LIST(iflush1),
 166         XFS_ERRORTAG_ATTR_LIST(iflush2),
 167         XFS_ERRORTAG_ATTR_LIST(iflush3),
 168         XFS_ERRORTAG_ATTR_LIST(iflush4),
 169         XFS_ERRORTAG_ATTR_LIST(iflush5),
 170         XFS_ERRORTAG_ATTR_LIST(iflush6),
 171         XFS_ERRORTAG_ATTR_LIST(dareadbuf),
 172         XFS_ERRORTAG_ATTR_LIST(btree_chk_lblk),
 173         XFS_ERRORTAG_ATTR_LIST(btree_chk_sblk),
 174         XFS_ERRORTAG_ATTR_LIST(readagf),
 175         XFS_ERRORTAG_ATTR_LIST(readagi),
 176         XFS_ERRORTAG_ATTR_LIST(itobp),
 177         XFS_ERRORTAG_ATTR_LIST(iunlink),
 178         XFS_ERRORTAG_ATTR_LIST(iunlinkrm),
 179         XFS_ERRORTAG_ATTR_LIST(dirinovalid),
 180         XFS_ERRORTAG_ATTR_LIST(bulkstat),
 181         XFS_ERRORTAG_ATTR_LIST(logiodone),
 182         XFS_ERRORTAG_ATTR_LIST(stratread),
 183         XFS_ERRORTAG_ATTR_LIST(stratcmpl),
 184         XFS_ERRORTAG_ATTR_LIST(diowrite),
 185         XFS_ERRORTAG_ATTR_LIST(bmapifmt),
 186         XFS_ERRORTAG_ATTR_LIST(free_extent),
 187         XFS_ERRORTAG_ATTR_LIST(rmap_finish_one),
 188         XFS_ERRORTAG_ATTR_LIST(refcount_continue_update),
 189         XFS_ERRORTAG_ATTR_LIST(refcount_finish_one),
 190         XFS_ERRORTAG_ATTR_LIST(bmap_finish_one),
 191         XFS_ERRORTAG_ATTR_LIST(ag_resv_critical),
 192         XFS_ERRORTAG_ATTR_LIST(drop_writes),
 193         XFS_ERRORTAG_ATTR_LIST(log_bad_crc),
 194         XFS_ERRORTAG_ATTR_LIST(log_item_pin),
 195         XFS_ERRORTAG_ATTR_LIST(buf_lru_ref),
 196         XFS_ERRORTAG_ATTR_LIST(force_repair),
 197         XFS_ERRORTAG_ATTR_LIST(bad_summary),
 198         NULL,
 199 };
 200
 201 static struct kobj_type xfs_errortag_ktype = {
 202         .release = xfs_sysfs_release,
 203         .sysfs_ops = &xfs_errortag_sysfs_ops,
 204         .default_attrs = xfs_errortag_attrs,
 205 };
 206
 207 int
 208 xfs_errortag_init(
 209         struct xfs_mount        *mp)
 210 {
 211         mp->m_errortag = kmem_zalloc(sizeof(unsigned int) * XFS_ERRTAG_MAX,
 212                         KM_SLEEP | KM_MAYFAIL);
 213         if (!mp->m_errortag)
 214                 return -ENOMEM;
 215
 216         return xfs_sysfs_init(&mp->m_errortag_kobj, &xfs_errortag_ktype,
 217                                &mp->m_kobj, "errortag");
 218 }
 219
 220 void
 221 xfs_errortag_del(
 222         struct xfs_mount        *mp)
 223 {
 224         xfs_sysfs_del(&mp->m_errortag_kobj);
 225         kmem_free(mp->m_errortag);
 226 }
 227
 228 bool
 229 xfs_errortag_test(
 230         struct xfs_mount        *mp,
 231         const char              *expression,
 232         const char              *file,
 233         int                     line,
 234         unsigned int            error_tag)
 235 {
 236         unsigned int            randfactor;
 237
 238         /*
 239          * To be able to use error injection anywhere, we need to ensure error
 240          * injection mechanism is already initialized.
 241          *
 242          * Code paths like I/O completion can be called before the
 243          * initialization is complete, but be able to inject errors in such
 244          * places is still useful.
 245          */
 246         if (!mp->m_errortag)
 247                 return false;
 248
 249         ASSERT(error_tag < XFS_ERRTAG_MAX);
 250         randfactor = mp->m_errortag[error_tag];
 251         if (!randfactor || prandom_u32() % randfactor)
 252                 return false;
 253
 254         xfs_warn_ratelimited(mp,
 255 "Injecting error (%s) at file %s, line %d, on filesystem \"%s\"",
 256                         expression, file, line, mp->m_fsname);
 257         return true;
 258 }
 259
 260 int
 261 xfs_errortag_get(
 262         struct xfs_mount        *mp,
 263         unsigned int            error_tag)
 264 {
 265         if (error_tag >= XFS_ERRTAG_MAX)
 266                 return -EINVAL;
 267
 268         return mp->m_errortag[error_tag];
 269 }
 270
 271 int
 272 xfs_errortag_set(
 273         struct xfs_mount        *mp,
 274         unsigned int            error_tag,
 275         unsigned int            tag_value)
 276 {
 277         if (error_tag >= XFS_ERRTAG_MAX)
 278                 return -EINVAL;
 279
 280         mp->m_errortag[error_tag] = tag_value;
 281         return 0;
 282 }
 283
 284 int
 285 xfs_errortag_add(
 286         struct xfs_mount        *mp,
 287         unsigned int            error_tag)
 288 {
 289         if (error_tag >= XFS_ERRTAG_MAX)
 290                 return -EINVAL;
 291
 292         return xfs_errortag_set(mp, error_tag,
 293                         xfs_errortag_random_default[error_tag]);
 294 }
 295
 296 int
 297 xfs_errortag_clearall(
 298         struct xfs_mount        *mp)
 299 {
 300         memset(mp->m_errortag, 0, sizeof(unsigned int) * XFS_ERRTAG_MAX);
 301         return 0;
 302 }
 303 #endif /* DEBUG */
 304
 305 void
 306 xfs_error_report(
 307         const char              *tag,
 308         int                     level,
 309         struct xfs_mount        *mp,
 310         const char              *filename,
 311         int                     linenum,
 312         xfs_failaddr_t          failaddr)
 313 {
 314         if (level <= xfs_error_level) {
 315                 xfs_alert_tag(mp, XFS_PTAG_ERROR_REPORT,
 316                 "Internal error %s at line %d of file %s.  Caller %pS",
 317                             tag, linenum, filename, failaddr);
 318
 319                 xfs_stack_trace();
 320         }
 321 }
 322
 323 void
 324 xfs_corruption_error(
 325         const char              *tag,
 326         int                     level,
 327         struct xfs_mount        *mp,
 328         void                    *buf,
 329         size_t                  bufsize,
 330         const char              *filename,
 331         int                     linenum,
 332         xfs_failaddr_t          failaddr)
 333 {
 334         if (level <= xfs_error_level)
 335                 xfs_hex_dump(buf, bufsize);
 336         xfs_error_report(tag, level, mp, filename, linenum, failaddr);
 337         xfs_alert(mp, "Corruption detected. Unmount and run xfs_repair");
 338 }
 339
 340 /*
 341  * Warnings specifically for verifier errors.  Differentiate CRC vs. invalid
 342  * values, and omit the stack trace unless the error level is tuned high.
 343  */
 344 void
 345 xfs_buf_verifier_error(
 346         struct xfs_buf          *bp,
 347         int                     error,
 348         const char              *name,
 349         void                    *buf,
 350         size_t                  bufsz,
 351         xfs_failaddr_t          failaddr)
 352 {
 353         struct xfs_mount        *mp = bp->b_target->bt_mount;
 354         xfs_failaddr_t          fa;
 355         int                     sz;
 356
 357         fa = failaddr ? failaddr : __return_address;
 358         __xfs_buf_ioerror(bp, error, fa);
 359
 360         xfs_alert(mp, "Metadata %s detected at %pS, %s block 0x%llx %s",
 361                   bp->b_error == -EFSBADCRC ? "CRC error" : "corruption",
 362                   fa, bp->b_ops->name, bp->b_bn, name);
 363
 364         xfs_alert(mp, "Unmount and run xfs_repair");
 365
 366         if (xfs_error_level >= XFS_ERRLEVEL_LOW) {
 367                 sz = min_t(size_t, XFS_CORRUPTION_DUMP_LEN, bufsz);
 368                 xfs_alert(mp, "First %d bytes of corrupted metadata buffer:",
 369                                 sz);
 370                 xfs_hex_dump(buf, sz);
 371         }
 372
 373         if (xfs_error_level >= XFS_ERRLEVEL_HIGH)
 374                 xfs_stack_trace();
 375 }
 376
 377 /*
 378  * Warnings specifically for verifier errors.  Differentiate CRC vs. invalid
 379  * values, and omit the stack trace unless the error level is tuned high.
 380  */
 381 void
 382 xfs_verifier_error(
 383         struct xfs_buf          *bp,
 384         int                     error,
 385         xfs_failaddr_t          failaddr)
 386 {
 387         return xfs_buf_verifier_error(bp, error, "", xfs_buf_offset(bp, 0),
 388                         XFS_CORRUPTION_DUMP_LEN, failaddr);
 389 }
 390
 391 /*
 392  * Warnings for inode corruption problems.  Don't bother with the stack
 393  * trace unless the error level is turned up high.
 394  */
 395 void
 396 xfs_inode_verifier_error(
 397         struct xfs_inode        *ip,
 398         int                     error,
 399         const char              *name,
 400         void                    *buf,
 401         size_t                  bufsz,
 402         xfs_failaddr_t          failaddr)
 403 {
 404         struct xfs_mount        *mp = ip->i_mount;
 405         xfs_failaddr_t          fa;
 406         int                     sz;
 407
 408         fa = failaddr ? failaddr : __return_address;
 409
 410         xfs_alert(mp, "Metadata %s detected at %pS, inode 0x%llx %s",
 411                   error == -EFSBADCRC ? "CRC error" : "corruption",
 412                   fa, ip->i_ino, name);
 413
 414         xfs_alert(mp, "Unmount and run xfs_repair");
 415
 416         if (buf && xfs_error_level >= XFS_ERRLEVEL_LOW) {
 417                 sz = min_t(size_t, XFS_CORRUPTION_DUMP_LEN, bufsz);
 418                 xfs_alert(mp, "First %d bytes of corrupted metadata buffer:",
 419                                 sz);
 420                 xfs_hex_dump(buf, sz);
 421         }
 422
 423         if (xfs_error_level >= XFS_ERRLEVEL_HIGH)
 424                 xfs_stack_trace();
 425 }