lustre/include/obd_support.h

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (C) 2001, 2002 Cluster File Systems, Inc.
   5  *
   6  *   This file is part of Lustre, http://www.lustre.org.
   7  *
   8  *   Lustre is free software; you can redistribute it and/or
   9  *   modify it under the terms of version 2 of the GNU General Public
  10  *   License as published by the Free Software Foundation.
  11  *
  12  *   Lustre is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with Lustre; if not, write to the Free Software
  19  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  *
  21  */
  22
  23 #ifndef _OBD_SUPPORT
  24 #define _OBD_SUPPORT
  25
  26 #include <libcfs/kp30.h>
  27
  28 /* global variables */
  29 extern atomic_t obd_memory;
  30 extern int obd_memmax;
  31 extern unsigned int obd_fail_loc;
  32 extern unsigned int obd_debug_peer_on_timeout;
  33 extern unsigned int obd_dump_on_timeout;
  34 extern unsigned int obd_dump_on_eviction;
  35 extern unsigned int obd_timeout;          /* seconds */
  36 #define PING_INTERVAL max(obd_timeout / 4, 1U)
  37 #define RECONNECT_INTERVAL max(obd_timeout / 10, 10U)
  38 extern unsigned int ldlm_timeout;
  39 extern unsigned int obd_health_check_timeout;
  40 extern unsigned int obd_sync_filter;
  41 extern unsigned int obd_max_dirty_pages;
  42 extern atomic_t obd_dirty_pages;
  43 extern cfs_waitq_t obd_race_waitq;
  44 extern int obd_race_state;
  45
  46
  47 #define OBD_FAIL_MDS                     0x100
  48 #define OBD_FAIL_MDS_HANDLE_UNPACK       0x101
  49 #define OBD_FAIL_MDS_GETATTR_NET         0x102
  50 #define OBD_FAIL_MDS_GETATTR_PACK        0x103
  51 #define OBD_FAIL_MDS_READPAGE_NET        0x104
  52 #define OBD_FAIL_MDS_READPAGE_PACK       0x105
  53 #define OBD_FAIL_MDS_SENDPAGE            0x106
  54 #define OBD_FAIL_MDS_REINT_NET           0x107
  55 #define OBD_FAIL_MDS_REINT_UNPACK        0x108
  56 #define OBD_FAIL_MDS_REINT_SETATTR       0x109
  57 #define OBD_FAIL_MDS_REINT_SETATTR_WRITE 0x10a
  58 #define OBD_FAIL_MDS_REINT_CREATE        0x10b
  59 #define OBD_FAIL_MDS_REINT_CREATE_WRITE  0x10c
  60 #define OBD_FAIL_MDS_REINT_UNLINK        0x10d
  61 #define OBD_FAIL_MDS_REINT_UNLINK_WRITE  0x10e
  62 #define OBD_FAIL_MDS_REINT_LINK          0x10f
  63 #define OBD_FAIL_MDS_REINT_LINK_WRITE    0x110
  64 #define OBD_FAIL_MDS_REINT_RENAME        0x111
  65 #define OBD_FAIL_MDS_REINT_RENAME_WRITE  0x112
  66 #define OBD_FAIL_MDS_OPEN_NET            0x113
  67 #define OBD_FAIL_MDS_OPEN_PACK           0x114
  68 #define OBD_FAIL_MDS_CLOSE_NET           0x115
  69 #define OBD_FAIL_MDS_CLOSE_PACK          0x116
  70 #define OBD_FAIL_MDS_CONNECT_NET         0x117
  71 #define OBD_FAIL_MDS_CONNECT_PACK        0x118
  72 #define OBD_FAIL_MDS_REINT_NET_REP       0x119
  73 #define OBD_FAIL_MDS_DISCONNECT_NET      0x11a
  74 #define OBD_FAIL_MDS_GETSTATUS_NET       0x11b
  75 #define OBD_FAIL_MDS_GETSTATUS_PACK      0x11c
  76 #define OBD_FAIL_MDS_STATFS_PACK         0x11d
  77 #define OBD_FAIL_MDS_STATFS_NET          0x11e
  78 #define OBD_FAIL_MDS_GETATTR_NAME_NET    0x11f
  79 #define OBD_FAIL_MDS_PIN_NET             0x120
  80 #define OBD_FAIL_MDS_UNPIN_NET           0x121
  81 #define OBD_FAIL_MDS_ALL_REPLY_NET       0x122
  82 #define OBD_FAIL_MDS_ALL_REQUEST_NET     0x123
  83 #define OBD_FAIL_MDS_SYNC_NET            0x124
  84 #define OBD_FAIL_MDS_SYNC_PACK           0x125
  85 #define OBD_FAIL_MDS_DONE_WRITING_NET    0x126
  86 #define OBD_FAIL_MDS_DONE_WRITING_PACK   0x127
  87 #define OBD_FAIL_MDS_ALLOC_OBDO          0x128
  88 #define OBD_FAIL_MDS_PAUSE_OPEN          0x129
  89 #define OBD_FAIL_MDS_STATFS_LCW_SLEEP    0x12a
  90 #define OBD_FAIL_MDS_OPEN_CREATE         0x12b
  91 #define OBD_FAIL_MDS_OST_SETATTR         0x12c
  92 #define OBD_FAIL_MDS_QUOTACHECK_NET      0x12d
  93 #define OBD_FAIL_MDS_QUOTACTL_NET        0x12e
  94 #define OBD_FAIL_MDS_CLIENT_ADD          0x12f
  95 #define OBD_FAIL_MDS_GETXATTR_NET        0x130
  96 #define OBD_FAIL_MDS_GETXATTR_PACK       0x131
  97 #define OBD_FAIL_MDS_SETXATTR_NET        0x132
  98 #define OBD_FAIL_MDS_SETXATTR            0x133
  99 #define OBD_FAIL_MDS_SETXATTR_WRITE      0x134
 100 #define OBD_FAIL_MDS_FS_SETUP            0x135
 101 #define OBD_FAIL_MDS_RESEND              0x136
 102
 103 #define OBD_FAIL_OST                     0x200
 104 #define OBD_FAIL_OST_CONNECT_NET         0x201
 105 #define OBD_FAIL_OST_DISCONNECT_NET      0x202
 106 #define OBD_FAIL_OST_GET_INFO_NET        0x203
 107 #define OBD_FAIL_OST_CREATE_NET          0x204
 108 #define OBD_FAIL_OST_DESTROY_NET         0x205
 109 #define OBD_FAIL_OST_GETATTR_NET         0x206
 110 #define OBD_FAIL_OST_SETATTR_NET         0x207
 111 #define OBD_FAIL_OST_OPEN_NET            0x208
 112 #define OBD_FAIL_OST_CLOSE_NET           0x209
 113 #define OBD_FAIL_OST_BRW_NET             0x20a
 114 #define OBD_FAIL_OST_PUNCH_NET           0x20b
 115 #define OBD_FAIL_OST_STATFS_NET          0x20c
 116 #define OBD_FAIL_OST_HANDLE_UNPACK       0x20d
 117 #define OBD_FAIL_OST_BRW_WRITE_BULK      0x20e
 118 #define OBD_FAIL_OST_BRW_READ_BULK       0x20f
 119 #define OBD_FAIL_OST_SYNC_NET            0x210
 120 #define OBD_FAIL_OST_ALL_REPLY_NET       0x211
 121 #define OBD_FAIL_OST_ALL_REQUESTS_NET    0x212
 122 #define OBD_FAIL_OST_LDLM_REPLY_NET      0x213
 123 #define OBD_FAIL_OST_BRW_PAUSE_BULK      0x214
 124 #define OBD_FAIL_OST_ENOSPC              0x215
 125 #define OBD_FAIL_OST_EROFS               0x216
 126 #define OBD_FAIL_OST_ENOENT              0x217
 127 #define OBD_FAIL_OST_QUOTACHECK_NET      0x218
 128 #define OBD_FAIL_OST_QUOTACTL_NET        0x219
 129 #define OBD_FAIL_OST_CHECKSUM_RECEIVE    0x21a
 130 #define OBD_FAIL_OST_CHECKSUM_SEND       0x21b
 131 #define OBD_FAIL_OST_BRW_SIZE            0x21c
 132 #define OBD_FAIL_OST_DROP_REQ            0x21d
 133 #define OBD_FAIL_OST_SETATTR_CREDITS     0x21e
 134
 135 #define OBD_FAIL_LDLM                    0x300
 136 #define OBD_FAIL_LDLM_NAMESPACE_NEW      0x301
 137 #define OBD_FAIL_LDLM_ENQUEUE            0x302
 138 #define OBD_FAIL_LDLM_CONVERT            0x303
 139 #define OBD_FAIL_LDLM_CANCEL             0x304
 140 #define OBD_FAIL_LDLM_BL_CALLBACK        0x305
 141 #define OBD_FAIL_LDLM_CP_CALLBACK        0x306
 142 #define OBD_FAIL_LDLM_GL_CALLBACK        0x307
 143 #define OBD_FAIL_LDLM_ENQUEUE_EXTENT_ERR 0x308
 144 #define OBD_FAIL_LDLM_ENQUEUE_INTENT_ERR 0x309
 145 #define OBD_FAIL_LDLM_CREATE_RESOURCE    0x30a
 146 #define OBD_FAIL_LDLM_ENQUEUE_BLOCKED    0x30b
 147 #define OBD_FAIL_LDLM_REPLY              0x30c
 148 #define OBD_FAIL_LDLM_RECOV_CLIENTS      0x30d
 149 #define OBD_FAIL_LDLM_ENQUEUE_OLD_EXPORT 0x30e
 150 #define OBD_FAIL_LDLM_GLIMPSE            0x30f
 151
 152 #define OBD_FAIL_OSC                     0x400
 153 #define OBD_FAIL_OSC_BRW_READ_BULK       0x401
 154 #define OBD_FAIL_OSC_BRW_WRITE_BULK      0x402
 155 #define OBD_FAIL_OSC_LOCK_BL_AST         0x403
 156 #define OBD_FAIL_OSC_LOCK_CP_AST         0x404
 157 #define OBD_FAIL_OSC_MATCH               0x405
 158 #define OBD_FAIL_OSC_BRW_PREP_REQ        0x406
 159 #define OBD_FAIL_OSC_SHUTDOWN            0x407
 160 #define OBD_FAIL_OSC_CHECKSUM_RECEIVE    0x408
 161 #define OBD_FAIL_OSC_CHECKSUM_SEND       0x409
 162
 163 #define OBD_FAIL_PTLRPC                  0x500
 164 #define OBD_FAIL_PTLRPC_ACK              0x501
 165 #define OBD_FAIL_PTLRPC_RQBD             0x502
 166 #define OBD_FAIL_PTLRPC_BULK_GET_NET     0x503
 167 #define OBD_FAIL_PTLRPC_BULK_PUT_NET     0x504
 168 #define OBD_FAIL_PTLRPC_DROP_RPC         0x505
 169 #define OBD_FAIL_PTLRPC_DELAY_SEND       0x506
 170
 171 #define OBD_FAIL_OBD_PING_NET            0x600
 172 #define OBD_FAIL_OBD_LOG_CANCEL_NET      0x601
 173 #define OBD_FAIL_OBD_LOGD_NET            0x602
 174 #define OBD_FAIL_OBD_QC_CALLBACK_NET     0x603
 175 #define OBD_FAIL_OBD_DQACQ               0x604
 176
 177 #define OBD_FAIL_TGT_REPLY_NET           0x700
 178 #define OBD_FAIL_TGT_CONN_RACE           0x701
 179 #define OBD_FAIL_TGT_FORCE_RECONNECT     0x702
 180 #define OBD_FAIL_TGT_DELAY_CONNECT       0x703
 181 #define OBD_FAIL_TGT_DELAY_RECONNECT     0x704
 182 #define OBD_FAIL_TGT_DELAY_PRECREATE     0x705
 183
 184 #define OBD_FAIL_MDC_REVALIDATE_PAUSE    0x800
 185
 186 #define OBD_FAIL_MGS                     0x900
 187 #define OBD_FAIL_MGS_ALL_REQUEST_NET     0x901
 188 #define OBD_FAIL_MGS_ALL_REPLY_NET       0x902
 189 #define OBD_FAIL_MGC_PROCESS_LOG         0x903
 190 #define OBD_FAIL_MGS_SLOW_REQUEST_NET    0x904
 191
 192 #define OBD_FAIL_QUOTA_QD_COUNT_32BIT    0xA00
 193
 194 #define OBD_FAIL_LPROC_REMOVE            0xB00
 195
 196 /* preparation for a more advanced failure testbed (not functional yet) */
 197 #define OBD_FAIL_MASK_SYS    0x0000FF00
 198 #define OBD_FAIL_MASK_LOC    (0x000000FF | OBD_FAIL_MASK_SYS)
 199 #define OBD_FAIL_ONCE        0x80000000
 200 #define OBD_FAILED           0x40000000
 201
 202 #define OBD_FAIL_CHECK(id)   (((obd_fail_loc & OBD_FAIL_MASK_LOC) ==           \
 203                               ((id) & OBD_FAIL_MASK_LOC)) &&                   \
 204                               ((obd_fail_loc & (OBD_FAILED | OBD_FAIL_ONCE))!= \
 205                                 (OBD_FAILED | OBD_FAIL_ONCE)))
 206
 207 #define OBD_FAIL_CHECK_ONCE(id)                                              \
 208 ({      int _ret_ = 0;                                                       \
 209         if (OBD_FAIL_CHECK(id)) {                                            \
 210                 CERROR("*** obd_fail_loc=%x ***\n", id);                     \
 211                 obd_fail_loc |= OBD_FAILED;                                  \
 212                 if ((id) & OBD_FAIL_ONCE)                                    \
 213                         obd_fail_loc |= OBD_FAIL_ONCE;                       \
 214                 _ret_ = 1;                                                   \
 215         }                                                                    \
 216         _ret_;                                                               \
 217 })
 218
 219 #define OBD_FAIL_RETURN(id, ret)                                             \
 220 do {                                                                         \
 221         if (OBD_FAIL_CHECK_ONCE(id)) {                                       \
 222                 RETURN(ret);                                                 \
 223         }                                                                    \
 224 } while(0)
 225
 226 #define OBD_FAIL_TIMEOUT(id, secs)                                           \
 227 do {                                                                         \
 228         if (OBD_FAIL_CHECK_ONCE(id)) {                                       \
 229                 CERROR("obd_fail_timeout id %x sleeping for %d secs\n",      \
 230                        (id), (secs));                                        \
 231                 set_current_state(TASK_UNINTERRUPTIBLE);                     \
 232                 cfs_schedule_timeout(CFS_TASK_UNINT,                         \
 233                                     cfs_time_seconds(secs));                 \
 234                 set_current_state(TASK_RUNNING);                             \
 235                 CERROR("obd_fail_timeout id %x awake\n", (id));              \
 236        }                                                                     \
 237 } while(0)
 238
 239 #ifdef __KERNEL__
 240 /* The idea here is to synchronise two threads to force a race. The
 241  * first thread that calls this with a matching fail_loc is put to
 242  * sleep. The next thread that calls with the same fail_loc wakes up
 243  * the first and continues. */
 244 #define OBD_RACE(id)                                                         \
 245 do {                                                                         \
 246         if  (OBD_FAIL_CHECK_ONCE(id)) {                                      \
 247                 obd_race_state = 0;                                          \
 248                 CERROR("obd_race id %x sleeping\n", (id));                   \
 249                 OBD_SLEEP_ON(obd_race_waitq, obd_race_state != 0);           \
 250                 CERROR("obd_fail_race id %x awake\n", (id));                 \
 251         } else if ((obd_fail_loc & OBD_FAIL_MASK_LOC) ==                     \
 252                     ((id) & OBD_FAIL_MASK_LOC)) {                            \
 253                 CERROR("obd_fail_race id %x waking\n", (id));                \
 254                 obd_race_state = 1;                                          \
 255                 wake_up(&obd_race_waitq);                                    \
 256         }                                                                    \
 257 } while(0)
 258 #else
 259 /* sigh.  an expedient fix until OBD_RACE is fixed up */
 260 #define OBD_RACE(foo) do {} while(0)
 261 #endif
 262
 263 #define fixme() CDEBUG(D_OTHER, "FIXME\n");
 264
 265 extern atomic_t libcfs_kmemory;
 266
 267 #if defined(LUSTRE_UTILS) /* this version is for utils only */
 268 #define OBD_ALLOC_GFP(ptr, size, gfp_mask)                                    \
 269 do {                                                                          \
 270         (ptr) = cfs_alloc(size, (gfp_mask));                                  \
 271         if ((ptr) == NULL) {                                                  \
 272                 CERROR("kmalloc of '" #ptr "' (%d bytes) failed at %s:%d\n",  \
 273                        (int)(size), __FILE__, __LINE__);                      \
 274         } else {                                                              \
 275                 memset(ptr, 0, size);                                         \
 276                 CDEBUG(D_MALLOC, "kmalloced '" #ptr "': %d at %p\n",          \
 277                        (int)(size), ptr);                                     \
 278         }                                                                     \
 279 } while (0)
 280 #else /* this version is for the kernel and liblustre */
 281 #define OBD_ALLOC_GFP(ptr, size, gfp_mask)                                    \
 282 do {                                                                          \
 283         (ptr) = cfs_alloc(size, (gfp_mask));                                  \
 284         if ((ptr) == NULL) {                                                  \
 285                 CERROR("kmalloc of '" #ptr "' (%d bytes) failed at %s:%d\n",  \
 286                        (int)(size), __FILE__, __LINE__);                      \
 287                 CERROR("%d total bytes allocated by Lustre, %d by Portals\n", \
 288                        atomic_read(&obd_memory), atomic_read(&libcfs_kmemory));\
 289         } else {                                                              \
 290                 memset(ptr, 0, size);                                         \
 291                 atomic_add(size, &obd_memory);                                \
 292                 if (atomic_read(&obd_memory) > obd_memmax)                    \
 293                         obd_memmax = atomic_read(&obd_memory);                \
 294                 CDEBUG(D_MALLOC, "kmalloced '" #ptr "': %d at %p (tot %d)\n", \
 295                        (int)(size), ptr, atomic_read(&obd_memory));           \
 296         }                                                                     \
 297 } while (0)
 298 #endif
 299
 300 #ifndef OBD_ALLOC_MASK
 301 # define OBD_ALLOC_MASK CFS_ALLOC_IO
 302 #endif
 303
 304 #define OBD_ALLOC(ptr, size) OBD_ALLOC_GFP(ptr, size, OBD_ALLOC_MASK)
 305 #define OBD_ALLOC_WAIT(ptr, size) OBD_ALLOC_GFP(ptr, size, CFS_ALLOC_STD)
 306 #define OBD_ALLOC_PTR(ptr) OBD_ALLOC(ptr, sizeof *(ptr))
 307 #define OBD_ALLOC_PTR_WAIT(ptr) OBD_ALLOC_WAIT(ptr, sizeof *(ptr))
 308
 309 #ifdef __arch_um__
 310 # define OBD_VMALLOC(ptr, size) OBD_ALLOC(ptr, size)
 311 #else
 312 # define OBD_VMALLOC(ptr, size)                                               \
 313 do {                                                                          \
 314         (ptr) = cfs_alloc_large(size);                                        \
 315         if ((ptr) == NULL) {                                                  \
 316                 CERROR("vmalloc of '" #ptr "' (%d bytes) failed at %s:%d\n",  \
 317                        (int)(size), __FILE__, __LINE__);                      \
 318                 CERROR("%d total bytes allocated by Lustre, %d by Portals\n", \
 319                        atomic_read(&obd_memory), atomic_read(&libcfs_kmemory));\
 320         } else {                                                              \
 321                 memset(ptr, 0, size);                                         \
 322                 atomic_add(size, &obd_memory);                                \
 323                 if (atomic_read(&obd_memory) > obd_memmax)                    \
 324                         obd_memmax = atomic_read(&obd_memory);                \
 325                 CDEBUG(D_MALLOC, "vmalloced '" #ptr "': %d at %p (tot %d)\n", \
 326                        (int)(size), ptr, atomic_read(&obd_memory));           \
 327         }                                                                     \
 328 } while (0)
 329 #endif
 330
 331 #ifdef CONFIG_DEBUG_SLAB
 332 #define POISON(ptr, c, s) do {} while (0)
 333 #else
 334 #define POISON(ptr, c, s) memset(ptr, c, s)
 335 #endif
 336
 337 #ifdef POISON_BULK
 338 #define POISON_PAGE(page, val) do { memset(kmap(page), val, CFS_PAGE_SIZE);   \
 339                                     kunmap(page); } while (0)
 340 #else
 341 #define POISON_PAGE(page, val) do { } while (0)
 342 #endif
 343
 344 #ifdef __KERNEL__
 345 #define OBD_FREE(ptr, size)                                                   \
 346 do {                                                                          \
 347         LASSERT(ptr);                                                         \
 348         atomic_sub(size, &obd_memory);                                        \
 349         CDEBUG(D_MALLOC, "kfreed '" #ptr "': %d at %p (tot %d).\n",           \
 350                (int)(size), ptr, atomic_read(&obd_memory));                   \
 351         POISON(ptr, 0x5a, size);                                              \
 352         cfs_free(ptr);                                                        \
 353         (ptr) = (void *)0xdeadbeef;                                           \
 354 } while (0)
 355 #else
 356 #define OBD_FREE(ptr, size) ((void)(size), free((ptr)))
 357 #endif
 358
 359 #ifdef __arch_um__
 360 # define OBD_VFREE(ptr, size) OBD_FREE(ptr, size)
 361 #else
 362 # define OBD_VFREE(ptr, size)                                                 \
 363 do {                                                                          \
 364         LASSERT(ptr);                                                         \
 365         atomic_sub(size, &obd_memory);                                        \
 366         CDEBUG(D_MALLOC, "vfreed '" #ptr "': %d at %p (tot %d).\n",           \
 367                (int)(size), ptr, atomic_read(&obd_memory));                   \
 368         POISON(ptr, 0x5a, size);                                              \
 369         cfs_free_large(ptr);                                                  \
 370         (ptr) = (void *)0xdeadbeef;                                           \
 371 } while (0)
 372 #endif
 373
 374 /* we memset() the slab object to 0 when allocation succeeds, so DO NOT
 375  * HAVE A CTOR THAT DOES ANYTHING.  its work will be cleared here.  we'd
 376  * love to assert on that, but slab.c keeps kmem_cache_s all to itself. */
 377 #define OBD_SLAB_ALLOC(ptr, slab, type, size)                                 \
 378 do {                                                                          \
 379         LASSERT(!in_interrupt());                                             \
 380         (ptr) = cfs_mem_cache_alloc(slab, (type));                            \
 381         if ((ptr) == NULL) {                                                  \
 382                 CERROR("slab-alloc of '"#ptr"' (%d bytes) failed at %s:%d\n", \
 383                        (int)(size), __FILE__, __LINE__);                      \
 384                 CERROR("%d total bytes allocated by Lustre, %d by Portals\n", \
 385                        atomic_read(&obd_memory), atomic_read(&libcfs_kmemory));\
 386         } else {                                                              \
 387                 memset(ptr, 0, size);                                         \
 388                 atomic_add(size, &obd_memory);                                \
 389                 if (atomic_read(&obd_memory) > obd_memmax)                    \
 390                         obd_memmax = atomic_read(&obd_memory);                \
 391                 CDEBUG(D_MALLOC, "slab-alloced '"#ptr"': %d at %p (tot %d)\n",\
 392                        (int)(size), ptr, atomic_read(&obd_memory));           \
 393         }                                                                     \
 394 } while (0)
 395
 396 #define OBD_FREE_PTR(ptr) OBD_FREE(ptr, sizeof *(ptr))
 397
 398 #define OBD_SLAB_FREE(ptr, slab, size)                                        \
 399 do {                                                                          \
 400         LASSERT(ptr);                                                         \
 401         CDEBUG(D_MALLOC, "slab-freed '" #ptr "': %d at %p (tot %d).\n",       \
 402                (int)(size), ptr, atomic_read(&obd_memory));                   \
 403         atomic_sub(size, &obd_memory);                                        \
 404         POISON(ptr, 0x5a, size);                                              \
 405         cfs_mem_cache_free(slab, ptr);                                        \
 406         (ptr) = (void *)0xdeadbeef;                                           \
 407 } while (0)
 408
 409 #define KEY_IS(str) (keylen >= strlen(key) && strcmp(key, str) == 0)
 410
 411 #if defined(__linux__)
 412 #include <linux/obd_support.h>
 413 #elif defined(__APPLE__)
 414 #include <darwin/obd_support.h>
 415 #elif defined(__WINNT__)
 416 #include <winnt/obd_support.h>
 417 #else
 418 #error Unsupported operating system.
 419 #endif
 420
 421 #endif