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         XFS_RANDOM_BUF_IOERROR,
  57         XFS_RANDOM_REDUCE_MAX_IEXTENTS,
  58         XFS_RANDOM_BMAP_ALLOC_MINLEN_EXTENT,
  59         XFS_RANDOM_AG_RESV_FAIL,
  60 };
  61
  62 struct xfs_errortag_attr {
  63         struct attribute        attr;
  64         unsigned int            tag;
  65 };
  66
  67 static inline struct xfs_errortag_attr *
  68 to_attr(struct attribute *attr)
  69 {
  70         return container_of(attr, struct xfs_errortag_attr, attr);
  71 }
  72
  73 static inline struct xfs_mount *
  74 to_mp(struct kobject *kobject)
  75 {
  76         struct xfs_kobj *kobj = to_kobj(kobject);
  77
  78         return container_of(kobj, struct xfs_mount, m_errortag_kobj);
  79 }
  80
  81 STATIC ssize_t
  82 xfs_errortag_attr_store(
  83         struct kobject          *kobject,
  84         struct attribute        *attr,
  85         const char              *buf,
  86         size_t                  count)
  87 {
  88         struct xfs_mount        *mp = to_mp(kobject);
  89         struct xfs_errortag_attr *xfs_attr = to_attr(attr);
  90         int                     ret;
  91         unsigned int            val;
  92
  93         if (strcmp(buf, "default") == 0) {
  94                 val = xfs_errortag_random_default[xfs_attr->tag];
  95         } else {
  96                 ret = kstrtouint(buf, 0, &val);
  97                 if (ret)
  98                         return ret;
  99         }
 100
 101         ret = xfs_errortag_set(mp, xfs_attr->tag, val);
 102         if (ret)
 103                 return ret;
 104         return count;
 105 }
 106
 107 STATIC ssize_t
 108 xfs_errortag_attr_show(
 109         struct kobject          *kobject,
 110         struct attribute        *attr,
 111         char                    *buf)
 112 {
 113         struct xfs_mount        *mp = to_mp(kobject);
 114         struct xfs_errortag_attr *xfs_attr = to_attr(attr);
 115
 116         return snprintf(buf, PAGE_SIZE, "%u\n",
 117                         xfs_errortag_get(mp, xfs_attr->tag));
 118 }
 119
 120 static const struct sysfs_ops xfs_errortag_sysfs_ops = {
 121         .show = xfs_errortag_attr_show,
 122         .store = xfs_errortag_attr_store,
 123 };
 124
 125 #define XFS_ERRORTAG_ATTR_RW(_name, _tag) \
 126 static struct xfs_errortag_attr xfs_errortag_attr_##_name = {           \
 127         .attr = {.name = __stringify(_name),                            \
 128                  .mode = VERIFY_OCTAL_PERMISSIONS(S_IWUSR | S_IRUGO) }, \
 129         .tag    = (_tag),                                               \
 130 }
 131
 132 #define XFS_ERRORTAG_ATTR_LIST(_name) &xfs_errortag_attr_##_name.attr
 133
 134 XFS_ERRORTAG_ATTR_RW(noerror,           XFS_ERRTAG_NOERROR);
 135 XFS_ERRORTAG_ATTR_RW(iflush1,           XFS_ERRTAG_IFLUSH_1);
 136 XFS_ERRORTAG_ATTR_RW(iflush2,           XFS_ERRTAG_IFLUSH_2);
 137 XFS_ERRORTAG_ATTR_RW(iflush3,           XFS_ERRTAG_IFLUSH_3);
 138 XFS_ERRORTAG_ATTR_RW(iflush4,           XFS_ERRTAG_IFLUSH_4);
 139 XFS_ERRORTAG_ATTR_RW(iflush5,           XFS_ERRTAG_IFLUSH_5);
 140 XFS_ERRORTAG_ATTR_RW(iflush6,           XFS_ERRTAG_IFLUSH_6);
 141 XFS_ERRORTAG_ATTR_RW(dareadbuf,         XFS_ERRTAG_DA_READ_BUF);
 142 XFS_ERRORTAG_ATTR_RW(btree_chk_lblk,    XFS_ERRTAG_BTREE_CHECK_LBLOCK);
 143 XFS_ERRORTAG_ATTR_RW(btree_chk_sblk,    XFS_ERRTAG_BTREE_CHECK_SBLOCK);
 144 XFS_ERRORTAG_ATTR_RW(readagf,           XFS_ERRTAG_ALLOC_READ_AGF);
 145 XFS_ERRORTAG_ATTR_RW(readagi,           XFS_ERRTAG_IALLOC_READ_AGI);
 146 XFS_ERRORTAG_ATTR_RW(itobp,             XFS_ERRTAG_ITOBP_INOTOBP);
 147 XFS_ERRORTAG_ATTR_RW(iunlink,           XFS_ERRTAG_IUNLINK);
 148 XFS_ERRORTAG_ATTR_RW(iunlinkrm,         XFS_ERRTAG_IUNLINK_REMOVE);
 149 XFS_ERRORTAG_ATTR_RW(dirinovalid,       XFS_ERRTAG_DIR_INO_VALIDATE);
 150 XFS_ERRORTAG_ATTR_RW(bulkstat,          XFS_ERRTAG_BULKSTAT_READ_CHUNK);
 151 XFS_ERRORTAG_ATTR_RW(logiodone,         XFS_ERRTAG_IODONE_IOERR);
 152 XFS_ERRORTAG_ATTR_RW(stratread,         XFS_ERRTAG_STRATREAD_IOERR);
 153 XFS_ERRORTAG_ATTR_RW(stratcmpl,         XFS_ERRTAG_STRATCMPL_IOERR);
 154 XFS_ERRORTAG_ATTR_RW(diowrite,          XFS_ERRTAG_DIOWRITE_IOERR);
 155 XFS_ERRORTAG_ATTR_RW(bmapifmt,          XFS_ERRTAG_BMAPIFORMAT);
 156 XFS_ERRORTAG_ATTR_RW(free_extent,       XFS_ERRTAG_FREE_EXTENT);
 157 XFS_ERRORTAG_ATTR_RW(rmap_finish_one,   XFS_ERRTAG_RMAP_FINISH_ONE);
 158 XFS_ERRORTAG_ATTR_RW(refcount_continue_update,  XFS_ERRTAG_REFCOUNT_CONTINUE_UPDATE);
 159 XFS_ERRORTAG_ATTR_RW(refcount_finish_one,       XFS_ERRTAG_REFCOUNT_FINISH_ONE);
 160 XFS_ERRORTAG_ATTR_RW(bmap_finish_one,   XFS_ERRTAG_BMAP_FINISH_ONE);
 161 XFS_ERRORTAG_ATTR_RW(ag_resv_critical,  XFS_ERRTAG_AG_RESV_CRITICAL);
 162 XFS_ERRORTAG_ATTR_RW(drop_writes,       XFS_ERRTAG_DROP_WRITES);
 163 XFS_ERRORTAG_ATTR_RW(log_bad_crc,       XFS_ERRTAG_LOG_BAD_CRC);
 164 XFS_ERRORTAG_ATTR_RW(log_item_pin,      XFS_ERRTAG_LOG_ITEM_PIN);
 165 XFS_ERRORTAG_ATTR_RW(buf_lru_ref,       XFS_ERRTAG_BUF_LRU_REF);
 166 XFS_ERRORTAG_ATTR_RW(force_repair,      XFS_ERRTAG_FORCE_SCRUB_REPAIR);
 167 XFS_ERRORTAG_ATTR_RW(bad_summary,       XFS_ERRTAG_FORCE_SUMMARY_RECALC);
 168 XFS_ERRORTAG_ATTR_RW(iunlink_fallback,  XFS_ERRTAG_IUNLINK_FALLBACK);
 169 XFS_ERRORTAG_ATTR_RW(buf_ioerror,       XFS_ERRTAG_BUF_IOERROR);
 170 XFS_ERRORTAG_ATTR_RW(reduce_max_iextents,       XFS_ERRTAG_REDUCE_MAX_IEXTENTS);
 171 XFS_ERRORTAG_ATTR_RW(bmap_alloc_minlen_extent,  XFS_ERRTAG_BMAP_ALLOC_MINLEN_EXTENT);
 172 XFS_ERRORTAG_ATTR_RW(ag_resv_fail, XFS_ERRTAG_AG_RESV_FAIL);
 173
 174 static struct attribute *xfs_errortag_attrs[] = {
 175         XFS_ERRORTAG_ATTR_LIST(noerror),
 176         XFS_ERRORTAG_ATTR_LIST(iflush1),
 177         XFS_ERRORTAG_ATTR_LIST(iflush2),
 178         XFS_ERRORTAG_ATTR_LIST(iflush3),
 179         XFS_ERRORTAG_ATTR_LIST(iflush4),
 180         XFS_ERRORTAG_ATTR_LIST(iflush5),
 181         XFS_ERRORTAG_ATTR_LIST(iflush6),
 182         XFS_ERRORTAG_ATTR_LIST(dareadbuf),
 183         XFS_ERRORTAG_ATTR_LIST(btree_chk_lblk),
 184         XFS_ERRORTAG_ATTR_LIST(btree_chk_sblk),
 185         XFS_ERRORTAG_ATTR_LIST(readagf),
 186         XFS_ERRORTAG_ATTR_LIST(readagi),
 187         XFS_ERRORTAG_ATTR_LIST(itobp),
 188         XFS_ERRORTAG_ATTR_LIST(iunlink),
 189         XFS_ERRORTAG_ATTR_LIST(iunlinkrm),
 190         XFS_ERRORTAG_ATTR_LIST(dirinovalid),
 191         XFS_ERRORTAG_ATTR_LIST(bulkstat),
 192         XFS_ERRORTAG_ATTR_LIST(logiodone),
 193         XFS_ERRORTAG_ATTR_LIST(stratread),
 194         XFS_ERRORTAG_ATTR_LIST(stratcmpl),
 195         XFS_ERRORTAG_ATTR_LIST(diowrite),
 196         XFS_ERRORTAG_ATTR_LIST(bmapifmt),
 197         XFS_ERRORTAG_ATTR_LIST(free_extent),
 198         XFS_ERRORTAG_ATTR_LIST(rmap_finish_one),
 199         XFS_ERRORTAG_ATTR_LIST(refcount_continue_update),
 200         XFS_ERRORTAG_ATTR_LIST(refcount_finish_one),
 201         XFS_ERRORTAG_ATTR_LIST(bmap_finish_one),
 202         XFS_ERRORTAG_ATTR_LIST(ag_resv_critical),
 203         XFS_ERRORTAG_ATTR_LIST(drop_writes),
 204         XFS_ERRORTAG_ATTR_LIST(log_bad_crc),
 205         XFS_ERRORTAG_ATTR_LIST(log_item_pin),
 206         XFS_ERRORTAG_ATTR_LIST(buf_lru_ref),
 207         XFS_ERRORTAG_ATTR_LIST(force_repair),
 208         XFS_ERRORTAG_ATTR_LIST(bad_summary),
 209         XFS_ERRORTAG_ATTR_LIST(iunlink_fallback),
 210         XFS_ERRORTAG_ATTR_LIST(buf_ioerror),
 211         XFS_ERRORTAG_ATTR_LIST(reduce_max_iextents),
 212         XFS_ERRORTAG_ATTR_LIST(bmap_alloc_minlen_extent),
 213         XFS_ERRORTAG_ATTR_LIST(ag_resv_fail),
 214         NULL,
 215 };
 216
 217 static struct kobj_type xfs_errortag_ktype = {
 218         .release = xfs_sysfs_release,
 219         .sysfs_ops = &xfs_errortag_sysfs_ops,
 220         .default_attrs = xfs_errortag_attrs,
 221 };
 222
 223 int
 224 xfs_errortag_init(
 225         struct xfs_mount        *mp)
 226 {
 227         mp->m_errortag = kmem_zalloc(sizeof(unsigned int) * XFS_ERRTAG_MAX,
 228                         KM_MAYFAIL);
 229         if (!mp->m_errortag)
 230                 return -ENOMEM;
 231
 232         return xfs_sysfs_init(&mp->m_errortag_kobj, &xfs_errortag_ktype,
 233                                &mp->m_kobj, "errortag");
 234 }
 235
 236 void
 237 xfs_errortag_del(
 238         struct xfs_mount        *mp)
 239 {
 240         xfs_sysfs_del(&mp->m_errortag_kobj);
 241         kmem_free(mp->m_errortag);
 242 }
 243
 244 bool
 245 xfs_errortag_test(
 246         struct xfs_mount        *mp,
 247         const char              *expression,
 248         const char              *file,
 249         int                     line,
 250         unsigned int            error_tag)
 251 {
 252         unsigned int            randfactor;
 253
 254         /*
 255          * To be able to use error injection anywhere, we need to ensure error
 256          * injection mechanism is already initialized.
 257          *
 258          * Code paths like I/O completion can be called before the
 259          * initialization is complete, but be able to inject errors in such
 260          * places is still useful.
 261          */
 262         if (!mp->m_errortag)
 263                 return false;
 264
 265         ASSERT(error_tag < XFS_ERRTAG_MAX);
 266         randfactor = mp->m_errortag[error_tag];
 267         if (!randfactor || prandom_u32() % randfactor)
 268                 return false;
 269
 270         xfs_warn_ratelimited(mp,
 271 "Injecting error (%s) at file %s, line %d, on filesystem \"%s\"",
 272                         expression, file, line, mp->m_super->s_id);
 273         return true;
 274 }
 275
 276 int
 277 xfs_errortag_get(
 278         struct xfs_mount        *mp,
 279         unsigned int            error_tag)
 280 {
 281         if (error_tag >= XFS_ERRTAG_MAX)
 282                 return -EINVAL;
 283
 284         return mp->m_errortag[error_tag];
 285 }
 286
 287 int
 288 xfs_errortag_set(
 289         struct xfs_mount        *mp,
 290         unsigned int            error_tag,
 291         unsigned int            tag_value)
 292 {
 293         if (error_tag >= XFS_ERRTAG_MAX)
 294                 return -EINVAL;
 295
 296         mp->m_errortag[error_tag] = tag_value;
 297         return 0;
 298 }
 299
 300 int
 301 xfs_errortag_add(
 302         struct xfs_mount        *mp,
 303         unsigned int            error_tag)
 304 {
 305         BUILD_BUG_ON(ARRAY_SIZE(xfs_errortag_random_default) != XFS_ERRTAG_MAX);
 306
 307         if (error_tag >= XFS_ERRTAG_MAX)
 308                 return -EINVAL;
 309
 310         return xfs_errortag_set(mp, error_tag,
 311                         xfs_errortag_random_default[error_tag]);
 312 }
 313
 314 int
 315 xfs_errortag_clearall(
 316         struct xfs_mount        *mp)
 317 {
 318         memset(mp->m_errortag, 0, sizeof(unsigned int) * XFS_ERRTAG_MAX);
 319         return 0;
 320 }
 321 #endif /* DEBUG */
 322
 323 void
 324 xfs_error_report(
 325         const char              *tag,
 326         int                     level,
 327         struct xfs_mount        *mp,
 328         const char              *filename,
 329         int                     linenum,
 330         xfs_failaddr_t          failaddr)
 331 {
 332         if (level <= xfs_error_level) {
 333                 xfs_alert_tag(mp, XFS_PTAG_ERROR_REPORT,
 334                 "Internal error %s at line %d of file %s.  Caller %pS",
 335                             tag, linenum, filename, failaddr);
 336
 337                 xfs_stack_trace();
 338         }
 339 }
 340
 341 void
 342 xfs_corruption_error(
 343         const char              *tag,
 344         int                     level,
 345         struct xfs_mount        *mp,
 346         const void              *buf,
 347         size_t                  bufsize,
 348         const char              *filename,
 349         int                     linenum,
 350         xfs_failaddr_t          failaddr)
 351 {
 352         if (buf && level <= xfs_error_level)
 353                 xfs_hex_dump(buf, bufsize);
 354         xfs_error_report(tag, level, mp, filename, linenum, failaddr);
 355         xfs_alert(mp, "Corruption detected. Unmount and run xfs_repair");
 356 }
 357
 358 /*
 359  * Complain about the kinds of metadata corruption that we can't detect from a
 360  * verifier, such as incorrect inter-block relationship data.  Does not set
 361  * bp->b_error.
 362  *
 363  * Call xfs_buf_mark_corrupt, not this function.
 364  */
 365 void
 366 xfs_buf_corruption_error(
 367         struct xfs_buf          *bp,
 368         xfs_failaddr_t          fa)
 369 {
 370         struct xfs_mount        *mp = bp->b_mount;
 371
 372         xfs_alert_tag(mp, XFS_PTAG_VERIFIER_ERROR,
 373                   "Metadata corruption detected at %pS, %s block 0x%llx",
 374                   fa, bp->b_ops->name, bp->b_bn);
 375
 376         xfs_alert(mp, "Unmount and run xfs_repair");
 377
 378         if (xfs_error_level >= XFS_ERRLEVEL_HIGH)
 379                 xfs_stack_trace();
 380 }
 381
 382 /*
 383  * Warnings specifically for verifier errors.  Differentiate CRC vs. invalid
 384  * values, and omit the stack trace unless the error level is tuned high.
 385  */
 386 void
 387 xfs_buf_verifier_error(
 388         struct xfs_buf          *bp,
 389         int                     error,
 390         const char              *name,
 391         const void              *buf,
 392         size_t                  bufsz,
 393         xfs_failaddr_t          failaddr)
 394 {
 395         struct xfs_mount        *mp = bp->b_mount;
 396         xfs_failaddr_t          fa;
 397         int                     sz;
 398
 399         fa = failaddr ? failaddr : __return_address;
 400         __xfs_buf_ioerror(bp, error, fa);
 401
 402         xfs_alert_tag(mp, XFS_PTAG_VERIFIER_ERROR,
 403                   "Metadata %s detected at %pS, %s block 0x%llx %s",
 404                   bp->b_error == -EFSBADCRC ? "CRC error" : "corruption",
 405                   fa, bp->b_ops->name, bp->b_bn, name);
 406
 407         xfs_alert(mp, "Unmount and run xfs_repair");
 408
 409         if (xfs_error_level >= XFS_ERRLEVEL_LOW) {
 410                 sz = min_t(size_t, XFS_CORRUPTION_DUMP_LEN, bufsz);
 411                 xfs_alert(mp, "First %d bytes of corrupted metadata buffer:",
 412                                 sz);
 413                 xfs_hex_dump(buf, sz);
 414         }
 415
 416         if (xfs_error_level >= XFS_ERRLEVEL_HIGH)
 417                 xfs_stack_trace();
 418 }
 419
 420 /*
 421  * Warnings specifically for verifier errors.  Differentiate CRC vs. invalid
 422  * values, and omit the stack trace unless the error level is tuned high.
 423  */
 424 void
 425 xfs_verifier_error(
 426         struct xfs_buf          *bp,
 427         int                     error,
 428         xfs_failaddr_t          failaddr)
 429 {
 430         return xfs_buf_verifier_error(bp, error, "", xfs_buf_offset(bp, 0),
 431                         XFS_CORRUPTION_DUMP_LEN, failaddr);
 432 }
 433
 434 /*
 435  * Warnings for inode corruption problems.  Don't bother with the stack
 436  * trace unless the error level is turned up high.
 437  */
 438 void
 439 xfs_inode_verifier_error(
 440         struct xfs_inode        *ip,
 441         int                     error,
 442         const char              *name,
 443         const void              *buf,
 444         size_t                  bufsz,
 445         xfs_failaddr_t          failaddr)
 446 {
 447         struct xfs_mount        *mp = ip->i_mount;
 448         xfs_failaddr_t          fa;
 449         int                     sz;
 450
 451         fa = failaddr ? failaddr : __return_address;
 452
 453         xfs_alert(mp, "Metadata %s detected at %pS, inode 0x%llx %s",
 454                   error == -EFSBADCRC ? "CRC error" : "corruption",
 455                   fa, ip->i_ino, name);
 456
 457         xfs_alert(mp, "Unmount and run xfs_repair");
 458
 459         if (buf && xfs_error_level >= XFS_ERRLEVEL_LOW) {
 460                 sz = min_t(size_t, XFS_CORRUPTION_DUMP_LEN, bufsz);
 461                 xfs_alert(mp, "First %d bytes of corrupted metadata buffer:",
 462                                 sz);
 463                 xfs_hex_dump(buf, sz);
 464         }
 465
 466         if (xfs_error_level >= XFS_ERRLEVEL_HIGH)
 467                 xfs_stack_trace();
 468 }