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 #include "xfs_sysfs.h"
  26
  27 #ifdef DEBUG
  28
  29 static unsigned int xfs_errortag_random_default[] = {
  30         XFS_RANDOM_DEFAULT,
  31         XFS_RANDOM_IFLUSH_1,
  32         XFS_RANDOM_IFLUSH_2,
  33         XFS_RANDOM_IFLUSH_3,
  34         XFS_RANDOM_IFLUSH_4,
  35         XFS_RANDOM_IFLUSH_5,
  36         XFS_RANDOM_IFLUSH_6,
  37         XFS_RANDOM_DA_READ_BUF,
  38         XFS_RANDOM_BTREE_CHECK_LBLOCK,
  39         XFS_RANDOM_BTREE_CHECK_SBLOCK,
  40         XFS_RANDOM_ALLOC_READ_AGF,
  41         XFS_RANDOM_IALLOC_READ_AGI,
  42         XFS_RANDOM_ITOBP_INOTOBP,
  43         XFS_RANDOM_IUNLINK,
  44         XFS_RANDOM_IUNLINK_REMOVE,
  45         XFS_RANDOM_DIR_INO_VALIDATE,
  46         XFS_RANDOM_BULKSTAT_READ_CHUNK,
  47         XFS_RANDOM_IODONE_IOERR,
  48         XFS_RANDOM_STRATREAD_IOERR,
  49         XFS_RANDOM_STRATCMPL_IOERR,
  50         XFS_RANDOM_DIOWRITE_IOERR,
  51         XFS_RANDOM_BMAPIFORMAT,
  52         XFS_RANDOM_FREE_EXTENT,
  53         XFS_RANDOM_RMAP_FINISH_ONE,
  54         XFS_RANDOM_REFCOUNT_CONTINUE_UPDATE,
  55         XFS_RANDOM_REFCOUNT_FINISH_ONE,
  56         XFS_RANDOM_BMAP_FINISH_ONE,
  57         XFS_RANDOM_AG_RESV_CRITICAL,
  58         XFS_RANDOM_DROP_WRITES,
  59         XFS_RANDOM_LOG_BAD_CRC,
  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
 165 static struct attribute *xfs_errortag_attrs[] = {
 166         XFS_ERRORTAG_ATTR_LIST(noerror),
 167         XFS_ERRORTAG_ATTR_LIST(iflush1),
 168         XFS_ERRORTAG_ATTR_LIST(iflush2),
 169         XFS_ERRORTAG_ATTR_LIST(iflush3),
 170         XFS_ERRORTAG_ATTR_LIST(iflush4),
 171         XFS_ERRORTAG_ATTR_LIST(iflush5),
 172         XFS_ERRORTAG_ATTR_LIST(iflush6),
 173         XFS_ERRORTAG_ATTR_LIST(dareadbuf),
 174         XFS_ERRORTAG_ATTR_LIST(btree_chk_lblk),
 175         XFS_ERRORTAG_ATTR_LIST(btree_chk_sblk),
 176         XFS_ERRORTAG_ATTR_LIST(readagf),
 177         XFS_ERRORTAG_ATTR_LIST(readagi),
 178         XFS_ERRORTAG_ATTR_LIST(itobp),
 179         XFS_ERRORTAG_ATTR_LIST(iunlink),
 180         XFS_ERRORTAG_ATTR_LIST(iunlinkrm),
 181         XFS_ERRORTAG_ATTR_LIST(dirinovalid),
 182         XFS_ERRORTAG_ATTR_LIST(bulkstat),
 183         XFS_ERRORTAG_ATTR_LIST(logiodone),
 184         XFS_ERRORTAG_ATTR_LIST(stratread),
 185         XFS_ERRORTAG_ATTR_LIST(stratcmpl),
 186         XFS_ERRORTAG_ATTR_LIST(diowrite),
 187         XFS_ERRORTAG_ATTR_LIST(bmapifmt),
 188         XFS_ERRORTAG_ATTR_LIST(free_extent),
 189         XFS_ERRORTAG_ATTR_LIST(rmap_finish_one),
 190         XFS_ERRORTAG_ATTR_LIST(refcount_continue_update),
 191         XFS_ERRORTAG_ATTR_LIST(refcount_finish_one),
 192         XFS_ERRORTAG_ATTR_LIST(bmap_finish_one),
 193         XFS_ERRORTAG_ATTR_LIST(ag_resv_critical),
 194         XFS_ERRORTAG_ATTR_LIST(drop_writes),
 195         XFS_ERRORTAG_ATTR_LIST(log_bad_crc),
 196         NULL,
 197 };
 198
 199 struct kobj_type xfs_errortag_ktype = {
 200         .release = xfs_sysfs_release,
 201         .sysfs_ops = &xfs_errortag_sysfs_ops,
 202         .default_attrs = xfs_errortag_attrs,
 203 };
 204
 205 int
 206 xfs_errortag_init(
 207         struct xfs_mount        *mp)
 208 {
 209         mp->m_errortag = kmem_zalloc(sizeof(unsigned int) * XFS_ERRTAG_MAX,
 210                         KM_SLEEP | KM_MAYFAIL);
 211         if (!mp->m_errortag)
 212                 return -ENOMEM;
 213
 214         return xfs_sysfs_init(&mp->m_errortag_kobj, &xfs_errortag_ktype,
 215                                &mp->m_kobj, "errortag");
 216 }
 217
 218 void
 219 xfs_errortag_del(
 220         struct xfs_mount        *mp)
 221 {
 222         xfs_sysfs_del(&mp->m_errortag_kobj);
 223         kmem_free(mp->m_errortag);
 224 }
 225
 226 bool
 227 xfs_errortag_test(
 228         struct xfs_mount        *mp,
 229         const char              *expression,
 230         const char              *file,
 231         int                     line,
 232         unsigned int            error_tag)
 233 {
 234         unsigned int            randfactor;
 235
 236         /*
 237          * To be able to use error injection anywhere, we need to ensure error
 238          * injection mechanism is already initialized.
 239          *
 240          * Code paths like I/O completion can be called before the
 241          * initialization is complete, but be able to inject errors in such
 242          * places is still useful.
 243          */
 244         if (!mp->m_errortag)
 245                 return false;
 246
 247         ASSERT(error_tag < XFS_ERRTAG_MAX);
 248         randfactor = mp->m_errortag[error_tag];
 249         if (!randfactor || prandom_u32() % randfactor)
 250                 return false;
 251
 252         xfs_warn_ratelimited(mp,
 253 "Injecting error (%s) at file %s, line %d, on filesystem \"%s\"",
 254                         expression, file, line, mp->m_fsname);
 255         return true;
 256 }
 257
 258 int
 259 xfs_errortag_get(
 260         struct xfs_mount        *mp,
 261         unsigned int            error_tag)
 262 {
 263         if (error_tag >= XFS_ERRTAG_MAX)
 264                 return -EINVAL;
 265
 266         return mp->m_errortag[error_tag];
 267 }
 268
 269 int
 270 xfs_errortag_set(
 271         struct xfs_mount        *mp,
 272         unsigned int            error_tag,
 273         unsigned int            tag_value)
 274 {
 275         if (error_tag >= XFS_ERRTAG_MAX)
 276                 return -EINVAL;
 277
 278         mp->m_errortag[error_tag] = tag_value;
 279         return 0;
 280 }
 281
 282 int
 283 xfs_errortag_add(
 284         struct xfs_mount        *mp,
 285         unsigned int            error_tag)
 286 {
 287         if (error_tag >= XFS_ERRTAG_MAX)
 288                 return -EINVAL;
 289
 290         return xfs_errortag_set(mp, error_tag,
 291                         xfs_errortag_random_default[error_tag]);
 292 }
 293
 294 int
 295 xfs_errortag_clearall(
 296         struct xfs_mount        *mp)
 297 {
 298         memset(mp->m_errortag, 0, sizeof(unsigned int) * XFS_ERRTAG_MAX);
 299         return 0;
 300 }
 301 #endif /* DEBUG */
 302
 303 void
 304 xfs_error_report(
 305         const char              *tag,
 306         int                     level,
 307         struct xfs_mount        *mp,
 308         const char              *filename,
 309         int                     linenum,
 310         void                    *ra)
 311 {
 312         if (level <= xfs_error_level) {
 313                 xfs_alert_tag(mp, XFS_PTAG_ERROR_REPORT,
 314                 "Internal error %s at line %d of file %s.  Caller %pS",
 315                             tag, linenum, filename, ra);
 316
 317                 xfs_stack_trace();
 318         }
 319 }
 320
 321 void
 322 xfs_corruption_error(
 323         const char              *tag,
 324         int                     level,
 325         struct xfs_mount        *mp,
 326         void                    *p,
 327         const char              *filename,
 328         int                     linenum,
 329         void                    *ra)
 330 {
 331         if (level <= xfs_error_level)
 332                 xfs_hex_dump(p, 64);
 333         xfs_error_report(tag, level, mp, filename, linenum, ra);
 334         xfs_alert(mp, "Corruption detected. Unmount and run xfs_repair");
 335 }
 336
 337 /*
 338  * Warnings specifically for verifier errors.  Differentiate CRC vs. invalid
 339  * values, and omit the stack trace unless the error level is tuned high.
 340  */
 341 void
 342 xfs_verifier_error(
 343         struct xfs_buf          *bp)
 344 {
 345         struct xfs_mount *mp = bp->b_target->bt_mount;
 346
 347         xfs_alert(mp, "Metadata %s detected at %pF, %s block 0x%llx",
 348                   bp->b_error == -EFSBADCRC ? "CRC error" : "corruption",
 349                   __return_address, bp->b_ops->name, bp->b_bn);
 350
 351         xfs_alert(mp, "Unmount and run xfs_repair");
 352
 353         if (xfs_error_level >= XFS_ERRLEVEL_LOW) {
 354                 xfs_alert(mp, "First 64 bytes of corrupted metadata buffer:");
 355                 xfs_hex_dump(xfs_buf_offset(bp, 0), 64);
 356         }
 357
 358         if (xfs_error_level >= XFS_ERRLEVEL_HIGH)
 359                 xfs_stack_trace();
 360 }