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