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_shared.h"
   8 #include "xfs_format.h"
   9 #include "xfs_fs.h"
  10 #include "xfs_log_format.h"
  11 #include "xfs_trans_resv.h"
  12 #include "xfs_mount.h"
  13 #include "xfs_errortag.h"
  14 #include "xfs_error.h"
  15 #include "xfs_sysfs.h"
  16 #include "xfs_inode.h"
  17
  18 #ifdef DEBUG
  19
  20 static unsigned int xfs_errortag_random_default[] = {
  21         XFS_RANDOM_DEFAULT,
  22         XFS_RANDOM_IFLUSH_1,
  23         XFS_RANDOM_IFLUSH_2,
  24         XFS_RANDOM_IFLUSH_3,
  25         XFS_RANDOM_IFLUSH_4,
  26         XFS_RANDOM_IFLUSH_5,
  27         XFS_RANDOM_IFLUSH_6,
  28         XFS_RANDOM_DA_READ_BUF,
  29         XFS_RANDOM_BTREE_CHECK_LBLOCK,
  30         XFS_RANDOM_BTREE_CHECK_SBLOCK,
  31         XFS_RANDOM_ALLOC_READ_AGF,
  32         XFS_RANDOM_IALLOC_READ_AGI,
  33         XFS_RANDOM_ITOBP_INOTOBP,
  34         XFS_RANDOM_IUNLINK,
  35         XFS_RANDOM_IUNLINK_REMOVE,
  36         XFS_RANDOM_DIR_INO_VALIDATE,
  37         XFS_RANDOM_BULKSTAT_READ_CHUNK,
  38         XFS_RANDOM_IODONE_IOERR,
  39         XFS_RANDOM_STRATREAD_IOERR,
  40         XFS_RANDOM_STRATCMPL_IOERR,
  41         XFS_RANDOM_DIOWRITE_IOERR,
  42         XFS_RANDOM_BMAPIFORMAT,
  43         XFS_RANDOM_FREE_EXTENT,
  44         XFS_RANDOM_RMAP_FINISH_ONE,
  45         XFS_RANDOM_REFCOUNT_CONTINUE_UPDATE,
  46         XFS_RANDOM_REFCOUNT_FINISH_ONE,
  47         XFS_RANDOM_BMAP_FINISH_ONE,
  48         XFS_RANDOM_AG_RESV_CRITICAL,
  49         XFS_RANDOM_DROP_WRITES,
  50         XFS_RANDOM_LOG_BAD_CRC,
  51         XFS_RANDOM_LOG_ITEM_PIN,
  52         XFS_RANDOM_BUF_LRU_REF,
  53         XFS_RANDOM_FORCE_SCRUB_REPAIR,
  54         XFS_RANDOM_FORCE_SUMMARY_RECALC,
  55         XFS_RANDOM_IUNLINK_FALLBACK,
  56 };
  57
  58 struct xfs_errortag_attr {
  59         struct attribute        attr;
  60         unsigned int            tag;
  61 };
  62
  63 static inline struct xfs_errortag_attr *
  64 to_attr(struct attribute *attr)
  65 {
  66         return container_of(attr, struct xfs_errortag_attr, attr);
  67 }
  68
  69 static inline struct xfs_mount *
  70 to_mp(struct kobject *kobject)
  71 {
  72         struct xfs_kobj *kobj = to_kobj(kobject);
  73
  74         return container_of(kobj, struct xfs_mount, m_errortag_kobj);
  75 }
  76
  77 STATIC ssize_t
  78 xfs_errortag_attr_store(
  79         struct kobject          *kobject,
  80         struct attribute        *attr,
  81         const char              *buf,
  82         size_t                  count)
  83 {
  84         struct xfs_mount        *mp = to_mp(kobject);
  85         struct xfs_errortag_attr *xfs_attr = to_attr(attr);
  86         int                     ret;
  87         unsigned int            val;
  88
  89         if (strcmp(buf, "default") == 0) {
  90                 val = xfs_errortag_random_default[xfs_attr->tag];
  91         } else {
  92                 ret = kstrtouint(buf, 0, &val);
  93                 if (ret)
  94                         return ret;
  95         }
  96
  97         ret = xfs_errortag_set(mp, xfs_attr->tag, val);
  98         if (ret)
  99                 return ret;
 100         return count;
 101 }
 102
 103 STATIC ssize_t
 104 xfs_errortag_attr_show(
 105         struct kobject          *kobject,
 106         struct attribute        *attr,
 107         char                    *buf)
 108 {
 109         struct xfs_mount        *mp = to_mp(kobject);
 110         struct xfs_errortag_attr *xfs_attr = to_attr(attr);
 111
 112         return snprintf(buf, PAGE_SIZE, "%u\n",
 113                         xfs_errortag_get(mp, xfs_attr->tag));
 114 }
 115
 116 static const struct sysfs_ops xfs_errortag_sysfs_ops = {
 117         .show = xfs_errortag_attr_show,
 118         .store = xfs_errortag_attr_store,
 119 };
 120
 121 #define XFS_ERRORTAG_ATTR_RW(_name, _tag) \
 122 static struct xfs_errortag_attr xfs_errortag_attr_##_name = {           \
 123         .attr = {.name = __stringify(_name),                            \
 124                  .mode = VERIFY_OCTAL_PERMISSIONS(S_IWUSR | S_IRUGO) }, \
 125         .tag    = (_tag),                                               \
 126 }
 127
 128 #define XFS_ERRORTAG_ATTR_LIST(_name) &xfs_errortag_attr_##_name.attr
 129
 130 XFS_ERRORTAG_ATTR_RW(noerror,           XFS_ERRTAG_NOERROR);
 131 XFS_ERRORTAG_ATTR_RW(iflush1,           XFS_ERRTAG_IFLUSH_1);
 132 XFS_ERRORTAG_ATTR_RW(iflush2,           XFS_ERRTAG_IFLUSH_2);
 133 XFS_ERRORTAG_ATTR_RW(iflush3,           XFS_ERRTAG_IFLUSH_3);
 134 XFS_ERRORTAG_ATTR_RW(iflush4,           XFS_ERRTAG_IFLUSH_4);
 135 XFS_ERRORTAG_ATTR_RW(iflush5,           XFS_ERRTAG_IFLUSH_5);
 136 XFS_ERRORTAG_ATTR_RW(iflush6,           XFS_ERRTAG_IFLUSH_6);
 137 XFS_ERRORTAG_ATTR_RW(dareadbuf,         XFS_ERRTAG_DA_READ_BUF);
 138 XFS_ERRORTAG_ATTR_RW(btree_chk_lblk,    XFS_ERRTAG_BTREE_CHECK_LBLOCK);
 139 XFS_ERRORTAG_ATTR_RW(btree_chk_sblk,    XFS_ERRTAG_BTREE_CHECK_SBLOCK);
 140 XFS_ERRORTAG_ATTR_RW(readagf,           XFS_ERRTAG_ALLOC_READ_AGF);
 141 XFS_ERRORTAG_ATTR_RW(readagi,           XFS_ERRTAG_IALLOC_READ_AGI);
 142 XFS_ERRORTAG_ATTR_RW(itobp,             XFS_ERRTAG_ITOBP_INOTOBP);
 143 XFS_ERRORTAG_ATTR_RW(iunlink,           XFS_ERRTAG_IUNLINK);
 144 XFS_ERRORTAG_ATTR_RW(iunlinkrm,         XFS_ERRTAG_IUNLINK_REMOVE);
 145 XFS_ERRORTAG_ATTR_RW(dirinovalid,       XFS_ERRTAG_DIR_INO_VALIDATE);
 146 XFS_ERRORTAG_ATTR_RW(bulkstat,          XFS_ERRTAG_BULKSTAT_READ_CHUNK);
 147 XFS_ERRORTAG_ATTR_RW(logiodone,         XFS_ERRTAG_IODONE_IOERR);
 148 XFS_ERRORTAG_ATTR_RW(stratread,         XFS_ERRTAG_STRATREAD_IOERR);
 149 XFS_ERRORTAG_ATTR_RW(stratcmpl,         XFS_ERRTAG_STRATCMPL_IOERR);
 150 XFS_ERRORTAG_ATTR_RW(diowrite,          XFS_ERRTAG_DIOWRITE_IOERR);
 151 XFS_ERRORTAG_ATTR_RW(bmapifmt,          XFS_ERRTAG_BMAPIFORMAT);
 152 XFS_ERRORTAG_ATTR_RW(free_extent,       XFS_ERRTAG_FREE_EXTENT);
 153 XFS_ERRORTAG_ATTR_RW(rmap_finish_one,   XFS_ERRTAG_RMAP_FINISH_ONE);
 154 XFS_ERRORTAG_ATTR_RW(refcount_continue_update,  XFS_ERRTAG_REFCOUNT_CONTINUE_UPDATE);
 155 XFS_ERRORTAG_ATTR_RW(refcount_finish_one,       XFS_ERRTAG_REFCOUNT_FINISH_ONE);
 156 XFS_ERRORTAG_ATTR_RW(bmap_finish_one,   XFS_ERRTAG_BMAP_FINISH_ONE);
 157 XFS_ERRORTAG_ATTR_RW(ag_resv_critical,  XFS_ERRTAG_AG_RESV_CRITICAL);
 158 XFS_ERRORTAG_ATTR_RW(drop_writes,       XFS_ERRTAG_DROP_WRITES);
 159 XFS_ERRORTAG_ATTR_RW(log_bad_crc,       XFS_ERRTAG_LOG_BAD_CRC);
 160 XFS_ERRORTAG_ATTR_RW(log_item_pin,      XFS_ERRTAG_LOG_ITEM_PIN);
 161 XFS_ERRORTAG_ATTR_RW(buf_lru_ref,       XFS_ERRTAG_BUF_LRU_REF);
 162 XFS_ERRORTAG_ATTR_RW(force_repair,      XFS_ERRTAG_FORCE_SCRUB_REPAIR);
 163 XFS_ERRORTAG_ATTR_RW(bad_summary,       XFS_ERRTAG_FORCE_SUMMARY_RECALC);
 164 XFS_ERRORTAG_ATTR_RW(iunlink_fallback,  XFS_ERRTAG_IUNLINK_FALLBACK);
 165
 166 static struct attribute *xfs_errortag_attrs[] = {
 167         XFS_ERRORTAG_ATTR_LIST(noerror),
 168         XFS_ERRORTAG_ATTR_LIST(iflush1),
 169         XFS_ERRORTAG_ATTR_LIST(iflush2),
 170         XFS_ERRORTAG_ATTR_LIST(iflush3),
 171         XFS_ERRORTAG_ATTR_LIST(iflush4),
 172         XFS_ERRORTAG_ATTR_LIST(iflush5),
 173         XFS_ERRORTAG_ATTR_LIST(iflush6),
 174         XFS_ERRORTAG_ATTR_LIST(dareadbuf),
 175         XFS_ERRORTAG_ATTR_LIST(btree_chk_lblk),
 176         XFS_ERRORTAG_ATTR_LIST(btree_chk_sblk),
 177         XFS_ERRORTAG_ATTR_LIST(readagf),
 178         XFS_ERRORTAG_ATTR_LIST(readagi),
 179         XFS_ERRORTAG_ATTR_LIST(itobp),
 180         XFS_ERRORTAG_ATTR_LIST(iunlink),
 181         XFS_ERRORTAG_ATTR_LIST(iunlinkrm),
 182         XFS_ERRORTAG_ATTR_LIST(dirinovalid),
 183         XFS_ERRORTAG_ATTR_LIST(bulkstat),
 184         XFS_ERRORTAG_ATTR_LIST(logiodone),
 185         XFS_ERRORTAG_ATTR_LIST(stratread),
 186         XFS_ERRORTAG_ATTR_LIST(stratcmpl),
 187         XFS_ERRORTAG_ATTR_LIST(diowrite),
 188         XFS_ERRORTAG_ATTR_LIST(bmapifmt),
 189         XFS_ERRORTAG_ATTR_LIST(free_extent),
 190         XFS_ERRORTAG_ATTR_LIST(rmap_finish_one),
 191         XFS_ERRORTAG_ATTR_LIST(refcount_continue_update),
 192         XFS_ERRORTAG_ATTR_LIST(refcount_finish_one),
 193         XFS_ERRORTAG_ATTR_LIST(bmap_finish_one),
 194         XFS_ERRORTAG_ATTR_LIST(ag_resv_critical),
 195         XFS_ERRORTAG_ATTR_LIST(drop_writes),
 196         XFS_ERRORTAG_ATTR_LIST(log_bad_crc),
 197         XFS_ERRORTAG_ATTR_LIST(log_item_pin),
 198         XFS_ERRORTAG_ATTR_LIST(buf_lru_ref),
 199         XFS_ERRORTAG_ATTR_LIST(force_repair),
 200         XFS_ERRORTAG_ATTR_LIST(bad_summary),
 201         XFS_ERRORTAG_ATTR_LIST(iunlink_fallback),
 202         NULL,
 203 };
 204
 205 static struct kobj_type xfs_errortag_ktype = {
 206         .release = xfs_sysfs_release,
 207         .sysfs_ops = &xfs_errortag_sysfs_ops,
 208         .default_attrs = xfs_errortag_attrs,
 209 };
 210
 211 int
 212 xfs_errortag_init(
 213         struct xfs_mount        *mp)
 214 {
 215         mp->m_errortag = kmem_zalloc(sizeof(unsigned int) * XFS_ERRTAG_MAX,
 216                         KM_MAYFAIL);
 217         if (!mp->m_errortag)
 218                 return -ENOMEM;
 219
 220         return xfs_sysfs_init(&mp->m_errortag_kobj, &xfs_errortag_ktype,
 221                                &mp->m_kobj, "errortag");
 222 }
 223
 224 void
 225 xfs_errortag_del(
 226         struct xfs_mount        *mp)
 227 {
 228         xfs_sysfs_del(&mp->m_errortag_kobj);
 229         kmem_free(mp->m_errortag);
 230 }
 231
 232 bool
 233 xfs_errortag_test(
 234         struct xfs_mount        *mp,
 235         const char              *expression,
 236         const char              *file,
 237         int                     line,
 238         unsigned int            error_tag)
 239 {
 240         unsigned int            randfactor;
 241
 242         /*
 243          * To be able to use error injection anywhere, we need to ensure error
 244          * injection mechanism is already initialized.
 245          *
 246          * Code paths like I/O completion can be called before the
 247          * initialization is complete, but be able to inject errors in such
 248          * places is still useful.
 249          */
 250         if (!mp->m_errortag)
 251                 return false;
 252
 253         ASSERT(error_tag < XFS_ERRTAG_MAX);
 254         randfactor = mp->m_errortag[error_tag];
 255         if (!randfactor || prandom_u32() % randfactor)
 256                 return false;
 257
 258         xfs_warn_ratelimited(mp,
 259 "Injecting error (%s) at file %s, line %d, on filesystem \"%s\"",
 260                         expression, file, line, mp->m_super->s_id);
 261         return true;
 262 }
 263
 264 int
 265 xfs_errortag_get(
 266         struct xfs_mount        *mp,
 267         unsigned int            error_tag)
 268 {
 269         if (error_tag >= XFS_ERRTAG_MAX)
 270                 return -EINVAL;
 271
 272         return mp->m_errortag[error_tag];
 273 }
 274
 275 int
 276 xfs_errortag_set(
 277         struct xfs_mount        *mp,
 278         unsigned int            error_tag,
 279         unsigned int            tag_value)
 280 {
 281         if (error_tag >= XFS_ERRTAG_MAX)
 282                 return -EINVAL;
 283
 284         mp->m_errortag[error_tag] = tag_value;
 285         return 0;
 286 }
 287
 288 int
 289 xfs_errortag_add(
 290         struct xfs_mount        *mp,
 291         unsigned int            error_tag)
 292 {
 293         if (error_tag >= XFS_ERRTAG_MAX)
 294                 return -EINVAL;
 295
 296         return xfs_errortag_set(mp, error_tag,
 297                         xfs_errortag_random_default[error_tag]);
 298 }
 299
 300 int
 301 xfs_errortag_clearall(
 302         struct xfs_mount        *mp)
 303 {
 304         memset(mp->m_errortag, 0, sizeof(unsigned int) * XFS_ERRTAG_MAX);
 305         return 0;
 306 }
 307 #endif /* DEBUG */
 308
 309 void
 310 xfs_error_report(
 311         const char              *tag,
 312         int                     level,
 313         struct xfs_mount        *mp,
 314         const char              *filename,
 315         int                     linenum,
 316         xfs_failaddr_t          failaddr)
 317 {
 318         if (level <= xfs_error_level) {
 319                 xfs_alert_tag(mp, XFS_PTAG_ERROR_REPORT,
 320                 "Internal error %s at line %d of file %s.  Caller %pS",
 321                             tag, linenum, filename, failaddr);
 322
 323                 xfs_stack_trace();
 324         }
 325 }
 326
 327 void
 328 xfs_corruption_error(
 329         const char              *tag,
 330         int                     level,
 331         struct xfs_mount        *mp,
 332         const void              *buf,
 333         size_t                  bufsize,
 334         const char              *filename,
 335         int                     linenum,
 336         xfs_failaddr_t          failaddr)
 337 {
 338         if (buf && level <= xfs_error_level)
 339                 xfs_hex_dump(buf, bufsize);
 340         xfs_error_report(tag, level, mp, filename, linenum, failaddr);
 341         xfs_alert(mp, "Corruption detected. Unmount and run xfs_repair");
 342 }
 343
 344 /*
 345  * Complain about the kinds of metadata corruption that we can't detect from a
 346  * verifier, such as incorrect inter-block relationship data.  Does not set
 347  * bp->b_error.
 348  *
 349  * Call xfs_buf_mark_corrupt, not this function.
 350  */
 351 void
 352 xfs_buf_corruption_error(
 353         struct xfs_buf          *bp,
 354         xfs_failaddr_t          fa)
 355 {
 356         struct xfs_mount        *mp = bp->b_mount;
 357
 358         xfs_alert_tag(mp, XFS_PTAG_VERIFIER_ERROR,
 359                   "Metadata corruption detected at %pS, %s block 0x%llx",
 360                   fa, bp->b_ops->name, bp->b_bn);
 361
 362         xfs_alert(mp, "Unmount and run xfs_repair");
 363
 364         if (xfs_error_level >= XFS_ERRLEVEL_HIGH)
 365                 xfs_stack_trace();
 366 }
 367
 368 /*
 369  * Warnings specifically for verifier errors.  Differentiate CRC vs. invalid
 370  * values, and omit the stack trace unless the error level is tuned high.
 371  */
 372 void
 373 xfs_buf_verifier_error(
 374         struct xfs_buf          *bp,
 375         int                     error,
 376         const char              *name,
 377         const void              *buf,
 378         size_t                  bufsz,
 379         xfs_failaddr_t          failaddr)
 380 {
 381         struct xfs_mount        *mp = bp->b_mount;
 382         xfs_failaddr_t          fa;
 383         int                     sz;
 384
 385         fa = failaddr ? failaddr : __return_address;
 386         __xfs_buf_ioerror(bp, error, fa);
 387
 388         xfs_alert_tag(mp, XFS_PTAG_VERIFIER_ERROR,
 389                   "Metadata %s detected at %pS, %s block 0x%llx %s",
 390                   bp->b_error == -EFSBADCRC ? "CRC error" : "corruption",
 391                   fa, bp->b_ops->name, bp->b_bn, name);
 392
 393         xfs_alert(mp, "Unmount and run xfs_repair");
 394
 395         if (xfs_error_level >= XFS_ERRLEVEL_LOW) {
 396                 sz = min_t(size_t, XFS_CORRUPTION_DUMP_LEN, bufsz);
 397                 xfs_alert(mp, "First %d bytes of corrupted metadata buffer:",
 398                                 sz);
 399                 xfs_hex_dump(buf, sz);
 400         }
 401
 402         if (xfs_error_level >= XFS_ERRLEVEL_HIGH)
 403                 xfs_stack_trace();
 404 }
 405
 406 /*
 407  * Warnings specifically for verifier errors.  Differentiate CRC vs. invalid
 408  * values, and omit the stack trace unless the error level is tuned high.
 409  */
 410 void
 411 xfs_verifier_error(
 412         struct xfs_buf          *bp,
 413         int                     error,
 414         xfs_failaddr_t          failaddr)
 415 {
 416         return xfs_buf_verifier_error(bp, error, "", xfs_buf_offset(bp, 0),
 417                         XFS_CORRUPTION_DUMP_LEN, failaddr);
 418 }
 419
 420 /*
 421  * Warnings for inode corruption problems.  Don't bother with the stack
 422  * trace unless the error level is turned up high.
 423  */
 424 void
 425 xfs_inode_verifier_error(
 426         struct xfs_inode        *ip,
 427         int                     error,
 428         const char              *name,
 429         const void              *buf,
 430         size_t                  bufsz,
 431         xfs_failaddr_t          failaddr)
 432 {
 433         struct xfs_mount        *mp = ip->i_mount;
 434         xfs_failaddr_t          fa;
 435         int                     sz;
 436
 437         fa = failaddr ? failaddr : __return_address;
 438
 439         xfs_alert(mp, "Metadata %s detected at %pS, inode 0x%llx %s",
 440                   error == -EFSBADCRC ? "CRC error" : "corruption",
 441                   fa, ip->i_ino, name);
 442
 443         xfs_alert(mp, "Unmount and run xfs_repair");
 444
 445         if (buf && xfs_error_level >= XFS_ERRLEVEL_LOW) {
 446                 sz = min_t(size_t, XFS_CORRUPTION_DUMP_LEN, bufsz);
 447                 xfs_alert(mp, "First %d bytes of corrupted metadata buffer:",
 448                                 sz);
 449                 xfs_hex_dump(buf, sz);
 450         }
 451
 452         if (xfs_error_level >= XFS_ERRLEVEL_HIGH)
 453                 xfs_stack_trace();
 454 }