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 #define LDLM_TIMEOUT_DEFAULT 20
  39 extern unsigned int ldlm_timeout;
  40 extern unsigned int obd_health_check_timeout;
  41 extern unsigned int obd_sync_filter;
  42 extern unsigned int obd_max_dirty_pages;
  43 extern atomic_t obd_dirty_pages;
  44 extern cfs_waitq_t obd_race_waitq;
  45 extern int obd_race_state;
  46
  47
  48 #define OBD_FAIL_MDS                     0x100
  49 #define OBD_FAIL_MDS_HANDLE_UNPACK       0x101
  50 #define OBD_FAIL_MDS_GETATTR_NET         0x102
  51 #define OBD_FAIL_MDS_GETATTR_PACK        0x103
  52 #define OBD_FAIL_MDS_READPAGE_NET        0x104
  53 #define OBD_FAIL_MDS_READPAGE_PACK       0x105
  54 #define OBD_FAIL_MDS_SENDPAGE            0x106
  55 #define OBD_FAIL_MDS_REINT_NET           0x107
  56 #define OBD_FAIL_MDS_REINT_UNPACK        0x108
  57 #define OBD_FAIL_MDS_REINT_SETATTR       0x109
  58 #define OBD_FAIL_MDS_REINT_SETATTR_WRITE 0x10a
  59 #define OBD_FAIL_MDS_REINT_CREATE        0x10b
  60 #define OBD_FAIL_MDS_REINT_CREATE_WRITE  0x10c
  61 #define OBD_FAIL_MDS_REINT_UNLINK        0x10d
  62 #define OBD_FAIL_MDS_REINT_UNLINK_WRITE  0x10e
  63 #define OBD_FAIL_MDS_REINT_LINK          0x10f
  64 #define OBD_FAIL_MDS_REINT_LINK_WRITE    0x110
  65 #define OBD_FAIL_MDS_REINT_RENAME        0x111
  66 #define OBD_FAIL_MDS_REINT_RENAME_WRITE  0x112
  67 #define OBD_FAIL_MDS_OPEN_NET            0x113
  68 #define OBD_FAIL_MDS_OPEN_PACK           0x114
  69 #define OBD_FAIL_MDS_CLOSE_NET           0x115
  70 #define OBD_FAIL_MDS_CLOSE_PACK          0x116
  71 #define OBD_FAIL_MDS_CONNECT_NET         0x117
  72 #define OBD_FAIL_MDS_CONNECT_PACK        0x118
  73 #define OBD_FAIL_MDS_REINT_NET_REP       0x119
  74 #define OBD_FAIL_MDS_DISCONNECT_NET      0x11a
  75 #define OBD_FAIL_MDS_GETSTATUS_NET       0x11b
  76 #define OBD_FAIL_MDS_GETSTATUS_PACK      0x11c
  77 #define OBD_FAIL_MDS_STATFS_PACK         0x11d
  78 #define OBD_FAIL_MDS_STATFS_NET          0x11e
  79 #define OBD_FAIL_MDS_GETATTR_NAME_NET    0x11f
  80 #define OBD_FAIL_MDS_PIN_NET             0x120
  81 #define OBD_FAIL_MDS_UNPIN_NET           0x121
  82 #define OBD_FAIL_MDS_ALL_REPLY_NET       0x122
  83 #define OBD_FAIL_MDS_ALL_REQUEST_NET     0x123
  84 #define OBD_FAIL_MDS_SYNC_NET            0x124
  85 #define OBD_FAIL_MDS_SYNC_PACK           0x125
  86 #define OBD_FAIL_MDS_DONE_WRITING_NET    0x126
  87 #define OBD_FAIL_MDS_DONE_WRITING_PACK   0x127
  88 #define OBD_FAIL_MDS_ALLOC_OBDO          0x128
  89 #define OBD_FAIL_MDS_PAUSE_OPEN          0x129
  90 #define OBD_FAIL_MDS_STATFS_LCW_SLEEP    0x12a
  91 #define OBD_FAIL_MDS_OPEN_CREATE         0x12b
  92 #define OBD_FAIL_MDS_OST_SETATTR         0x12c
  93 #define OBD_FAIL_MDS_QUOTACHECK_NET      0x12d
  94 #define OBD_FAIL_MDS_QUOTACTL_NET        0x12e
  95 #define OBD_FAIL_MDS_CLIENT_ADD          0x12f
  96 #define OBD_FAIL_MDS_GETXATTR_NET        0x130
  97 #define OBD_FAIL_MDS_GETXATTR_PACK       0x131
  98 #define OBD_FAIL_MDS_SETXATTR_NET        0x132
  99 #define OBD_FAIL_MDS_SETXATTR            0x133
 100 #define OBD_FAIL_MDS_SETXATTR_WRITE      0x134
 101 #define OBD_FAIL_MDS_FS_SETUP            0x135
 102 #define OBD_FAIL_MDS_RESEND              0x136
 103
 104 #define OBD_FAIL_OST                     0x200
 105 #define OBD_FAIL_OST_CONNECT_NET         0x201
 106 #define OBD_FAIL_OST_DISCONNECT_NET      0x202
 107 #define OBD_FAIL_OST_GET_INFO_NET        0x203
 108 #define OBD_FAIL_OST_CREATE_NET          0x204
 109 #define OBD_FAIL_OST_DESTROY_NET         0x205
 110 #define OBD_FAIL_OST_GETATTR_NET         0x206
 111 #define OBD_FAIL_OST_SETATTR_NET         0x207
 112 #define OBD_FAIL_OST_OPEN_NET            0x208
 113 #define OBD_FAIL_OST_CLOSE_NET           0x209
 114 #define OBD_FAIL_OST_BRW_NET             0x20a
 115 #define OBD_FAIL_OST_PUNCH_NET           0x20b
 116 #define OBD_FAIL_OST_STATFS_NET          0x20c
 117 #define OBD_FAIL_OST_HANDLE_UNPACK       0x20d
 118 #define OBD_FAIL_OST_BRW_WRITE_BULK      0x20e
 119 #define OBD_FAIL_OST_BRW_READ_BULK       0x20f
 120 #define OBD_FAIL_OST_SYNC_NET            0x210
 121 #define OBD_FAIL_OST_ALL_REPLY_NET       0x211
 122 #define OBD_FAIL_OST_ALL_REQUESTS_NET    0x212
 123 #define OBD_FAIL_OST_LDLM_REPLY_NET      0x213
 124 #define OBD_FAIL_OST_BRW_PAUSE_BULK      0x214
 125 #define OBD_FAIL_OST_ENOSPC              0x215
 126 #define OBD_FAIL_OST_EROFS               0x216
 127 #define OBD_FAIL_OST_ENOENT              0x217
 128 #define OBD_FAIL_OST_QUOTACHECK_NET      0x218
 129 #define OBD_FAIL_OST_QUOTACTL_NET        0x219
 130 #define OBD_FAIL_OST_CHECKSUM_RECEIVE    0x21a
 131 #define OBD_FAIL_OST_CHECKSUM_SEND       0x21b
 132 #define OBD_FAIL_OST_BRW_SIZE            0x21c
 133 #define OBD_FAIL_OST_DROP_REQ            0x21d
 134 #define OBD_FAIL_OST_SETATTR_CREDITS     0x21e
 135 #define OBD_FAIL_OST_HOLD_WRITE_RPC      0x21f
 136
 137 #define OBD_FAIL_LDLM                    0x300
 138 #define OBD_FAIL_LDLM_NAMESPACE_NEW      0x301
 139 #define OBD_FAIL_LDLM_ENQUEUE            0x302
 140 #define OBD_FAIL_LDLM_CONVERT            0x303
 141 #define OBD_FAIL_LDLM_CANCEL             0x304
 142 #define OBD_FAIL_LDLM_BL_CALLBACK        0x305
 143 #define OBD_FAIL_LDLM_CP_CALLBACK        0x306
 144 #define OBD_FAIL_LDLM_GL_CALLBACK        0x307
 145 #define OBD_FAIL_LDLM_ENQUEUE_EXTENT_ERR 0x308
 146 #define OBD_FAIL_LDLM_ENQUEUE_INTENT_ERR 0x309
 147 #define OBD_FAIL_LDLM_CREATE_RESOURCE    0x30a
 148 #define OBD_FAIL_LDLM_ENQUEUE_BLOCKED    0x30b
 149 #define OBD_FAIL_LDLM_REPLY              0x30c
 150 #define OBD_FAIL_LDLM_RECOV_CLIENTS      0x30d
 151 #define OBD_FAIL_LDLM_ENQUEUE_OLD_EXPORT 0x30e
 152 #define OBD_FAIL_LDLM_GLIMPSE            0x30f
 153
 154 #define OBD_FAIL_OSC                     0x400
 155 #define OBD_FAIL_OSC_BRW_READ_BULK       0x401
 156 #define OBD_FAIL_OSC_BRW_WRITE_BULK      0x402
 157 #define OBD_FAIL_OSC_LOCK_BL_AST         0x403
 158 #define OBD_FAIL_OSC_LOCK_CP_AST         0x404
 159 #define OBD_FAIL_OSC_MATCH               0x405
 160 #define OBD_FAIL_OSC_BRW_PREP_REQ        0x406
 161 #define OBD_FAIL_OSC_SHUTDOWN            0x407
 162 #define OBD_FAIL_OSC_CHECKSUM_RECEIVE    0x408
 163 #define OBD_FAIL_OSC_CHECKSUM_SEND       0x409
 164
 165 #define OBD_FAIL_PTLRPC                  0x500
 166 #define OBD_FAIL_PTLRPC_ACK              0x501
 167 #define OBD_FAIL_PTLRPC_RQBD             0x502
 168 #define OBD_FAIL_PTLRPC_BULK_GET_NET     0x503
 169 #define OBD_FAIL_PTLRPC_BULK_PUT_NET     0x504
 170 #define OBD_FAIL_PTLRPC_DROP_RPC         0x505
 171 #define OBD_FAIL_PTLRPC_DELAY_SEND       0x506
 172
 173 #define OBD_FAIL_OBD_PING_NET            0x600
 174 #define OBD_FAIL_OBD_LOG_CANCEL_NET      0x601
 175 #define OBD_FAIL_OBD_LOGD_NET            0x602
 176 #define OBD_FAIL_OBD_QC_CALLBACK_NET     0x603
 177 #define OBD_FAIL_OBD_DQACQ               0x604
 178
 179 #define OBD_FAIL_TGT_REPLY_NET           0x700
 180 #define OBD_FAIL_TGT_CONN_RACE           0x701
 181 #define OBD_FAIL_TGT_FORCE_RECONNECT     0x702
 182 #define OBD_FAIL_TGT_DELAY_CONNECT       0x703
 183 #define OBD_FAIL_TGT_DELAY_RECONNECT     0x704
 184 #define OBD_FAIL_TGT_DELAY_PRECREATE     0x705
 185
 186 #define OBD_FAIL_MDC_REVALIDATE_PAUSE    0x800
 187
 188 #define OBD_FAIL_MGS                     0x900
 189 #define OBD_FAIL_MGS_ALL_REQUEST_NET     0x901
 190 #define OBD_FAIL_MGS_ALL_REPLY_NET       0x902
 191 #define OBD_FAIL_MGC_PROCESS_LOG         0x903
 192 #define OBD_FAIL_MGS_SLOW_REQUEST_NET    0x904
 193 #define OBD_FAIL_MGS_SLOW_TARGET_REG     0x905
 194
 195 #define OBD_FAIL_QUOTA_QD_COUNT_32BIT    0xA00
 196
 197 #define OBD_FAIL_LPROC_REMOVE            0xB00
 198
 199 /* preparation for a more advanced failure testbed (not functional yet) */
 200 #define OBD_FAIL_MASK_SYS    0x0000FF00
 201 #define OBD_FAIL_MASK_LOC    (0x000000FF | OBD_FAIL_MASK_SYS)
 202 #define OBD_FAIL_ONCE        0x80000000
 203 #define OBD_FAILED           0x40000000
 204
 205 #define OBD_FAIL_CHECK(id)   (((obd_fail_loc & OBD_FAIL_MASK_LOC) ==           \
 206                               ((id) & OBD_FAIL_MASK_LOC)) &&                   \
 207                               ((obd_fail_loc & (OBD_FAILED | OBD_FAIL_ONCE))!= \
 208                                 (OBD_FAILED | OBD_FAIL_ONCE)))
 209
 210 #define OBD_FAIL_CHECK_ONCE(id)                                              \
 211 ({      int _ret_ = 0;                                                       \
 212         if (OBD_FAIL_CHECK(id)) {                                            \
 213                 CERROR("*** obd_fail_loc=%x ***\n", id);                     \
 214                 obd_fail_loc |= OBD_FAILED;                                  \
 215                 if ((id) & OBD_FAIL_ONCE)                                    \
 216                         obd_fail_loc |= OBD_FAIL_ONCE;                       \
 217                 _ret_ = 1;                                                   \
 218         }                                                                    \
 219         _ret_;                                                               \
 220 })
 221
 222 #define OBD_FAIL_RETURN(id, ret)                                             \
 223 do {                                                                         \
 224         if (OBD_FAIL_CHECK_ONCE(id)) {                                       \
 225                 RETURN(ret);                                                 \
 226         }                                                                    \
 227 } while(0)
 228
 229 #define OBD_FAIL_TIMEOUT(id, secs)                                           \
 230 do {                                                                         \
 231         if (OBD_FAIL_CHECK_ONCE(id)) {                                       \
 232                 CERROR("obd_fail_timeout id %x sleeping for %d secs\n",      \
 233                        (id), (secs));                                        \
 234                 set_current_state(TASK_UNINTERRUPTIBLE);                     \
 235                 cfs_schedule_timeout(CFS_TASK_UNINT,                         \
 236                                     cfs_time_seconds(secs));                 \
 237                 set_current_state(TASK_RUNNING);                             \
 238                 CERROR("obd_fail_timeout id %x awake\n", (id));              \
 239        }                                                                     \
 240 } while(0)
 241
 242 #ifdef __KERNEL__
 243 /* The idea here is to synchronise two threads to force a race. The
 244  * first thread that calls this with a matching fail_loc is put to
 245  * sleep. The next thread that calls with the same fail_loc wakes up
 246  * the first and continues. */
 247 #define OBD_RACE(id)                                                         \
 248 do {                                                                         \
 249         if  (OBD_FAIL_CHECK_ONCE(id)) {                                      \
 250                 obd_race_state = 0;                                          \
 251                 CERROR("obd_race id %x sleeping\n", (id));                   \
 252                 OBD_SLEEP_ON(obd_race_waitq, obd_race_state != 0);           \
 253                 CERROR("obd_fail_race id %x awake\n", (id));                 \
 254         } else if ((obd_fail_loc & OBD_FAIL_MASK_LOC) ==                     \
 255                     ((id) & OBD_FAIL_MASK_LOC)) {                            \
 256                 CERROR("obd_fail_race id %x waking\n", (id));                \
 257                 obd_race_state = 1;                                          \
 258                 wake_up(&obd_race_waitq);                                    \
 259         }                                                                    \
 260 } while(0)
 261 #else
 262 /* sigh.  an expedient fix until OBD_RACE is fixed up */
 263 #define OBD_RACE(foo) do {} while(0)
 264 #endif
 265
 266 #define fixme() CDEBUG(D_OTHER, "FIXME\n");
 267
 268 extern atomic_t libcfs_kmemory;
 269
 270 #if defined(LUSTRE_UTILS) /* this version is for utils only */
 271 #define OBD_ALLOC_GFP(ptr, size, gfp_mask)                                    \
 272 do {                                                                          \
 273         (ptr) = cfs_alloc(size, (gfp_mask));                                  \
 274         if ((ptr) == NULL) {                                                  \
 275                 CERROR("kmalloc of '" #ptr "' (%d bytes) failed at %s:%d\n",  \
 276                        (int)(size), __FILE__, __LINE__);                      \
 277         } else {                                                              \
 278                 memset(ptr, 0, size);                                         \
 279                 CDEBUG(D_MALLOC, "kmalloced '" #ptr "': %d at %p\n",          \
 280                        (int)(size), ptr);                                     \
 281         }                                                                     \
 282 } while (0)
 283 #else /* this version is for the kernel and liblustre */
 284 #define OBD_ALLOC_GFP(ptr, size, gfp_mask)                                    \
 285 do {                                                                          \
 286         (ptr) = cfs_alloc(size, (gfp_mask));                                  \
 287         if ((ptr) == NULL) {                                                  \
 288                 CERROR("kmalloc of '" #ptr "' (%d bytes) failed at %s:%d\n",  \
 289                        (int)(size), __FILE__, __LINE__);                      \
 290                 CERROR("%d total bytes allocated by Lustre, %d by Portals\n", \
 291                        atomic_read(&obd_memory), atomic_read(&libcfs_kmemory));\
 292         } else {                                                              \
 293                 memset(ptr, 0, size);                                         \
 294                 atomic_add(size, &obd_memory);                                \
 295                 if (atomic_read(&obd_memory) > obd_memmax)                    \
 296                         obd_memmax = atomic_read(&obd_memory);                \
 297                 CDEBUG(D_MALLOC, "kmalloced '" #ptr "': %d at %p (tot %d)\n", \
 298                        (int)(size), ptr, atomic_read(&obd_memory));           \
 299         }                                                                     \
 300 } while (0)
 301 #endif
 302
 303 #ifndef OBD_ALLOC_MASK
 304 # define OBD_ALLOC_MASK CFS_ALLOC_IO
 305 #endif
 306
 307 #define OBD_ALLOC(ptr, size) OBD_ALLOC_GFP(ptr, size, OBD_ALLOC_MASK)
 308 #define OBD_ALLOC_WAIT(ptr, size) OBD_ALLOC_GFP(ptr, size, CFS_ALLOC_STD)
 309 #define OBD_ALLOC_PTR(ptr) OBD_ALLOC(ptr, sizeof *(ptr))
 310 #define OBD_ALLOC_PTR_WAIT(ptr) OBD_ALLOC_WAIT(ptr, sizeof *(ptr))
 311
 312 #ifdef __arch_um__
 313 # define OBD_VMALLOC(ptr, size) OBD_ALLOC(ptr, size)
 314 #else
 315 # define OBD_VMALLOC(ptr, size)                                               \
 316 do {                                                                          \
 317         (ptr) = cfs_alloc_large(size);                                        \
 318         if ((ptr) == NULL) {                                                  \
 319                 CERROR("vmalloc of '" #ptr "' (%d bytes) failed at %s:%d\n",  \
 320                        (int)(size), __FILE__, __LINE__);                      \
 321                 CERROR("%d total bytes allocated by Lustre, %d by Portals\n", \
 322                        atomic_read(&obd_memory), atomic_read(&libcfs_kmemory));\
 323         } else {                                                              \
 324                 memset(ptr, 0, size);                                         \
 325                 atomic_add(size, &obd_memory);                                \
 326                 if (atomic_read(&obd_memory) > obd_memmax)                    \
 327                         obd_memmax = atomic_read(&obd_memory);                \
 328                 CDEBUG(D_MALLOC, "vmalloced '" #ptr "': %d at %p (tot %d)\n", \
 329                        (int)(size), ptr, atomic_read(&obd_memory));           \
 330         }                                                                     \
 331 } while (0)
 332 #endif
 333
 334 #ifdef CONFIG_DEBUG_SLAB
 335 #define POISON(ptr, c, s) do {} while (0)
 336 #else
 337 #define POISON(ptr, c, s) memset(ptr, c, s)
 338 #endif
 339
 340 #ifdef POISON_BULK
 341 #define POISON_PAGE(page, val) do { memset(kmap(page), val, CFS_PAGE_SIZE);   \
 342                                     kunmap(page); } while (0)
 343 #else
 344 #define POISON_PAGE(page, val) do { } while (0)
 345 #endif
 346
 347 #ifdef __KERNEL__
 348 #define OBD_FREE(ptr, size)                                                   \
 349 do {                                                                          \
 350         LASSERT(ptr);                                                         \
 351         atomic_sub(size, &obd_memory);                                        \
 352         CDEBUG(D_MALLOC, "kfreed '" #ptr "': %d at %p (tot %d).\n",           \
 353                (int)(size), ptr, atomic_read(&obd_memory));                   \
 354         POISON(ptr, 0x5a, size);                                              \
 355         cfs_free(ptr);                                                        \
 356         (ptr) = (void *)0xdeadbeef;                                           \
 357 } while (0)
 358 #else
 359 #define OBD_FREE(ptr, size) ((void)(size), free((ptr)))
 360 #endif
 361
 362 #ifdef __arch_um__
 363 # define OBD_VFREE(ptr, size) OBD_FREE(ptr, size)
 364 #else
 365 # define OBD_VFREE(ptr, size)                                                 \
 366 do {                                                                          \
 367         LASSERT(ptr);                                                         \
 368         atomic_sub(size, &obd_memory);                                        \
 369         CDEBUG(D_MALLOC, "vfreed '" #ptr "': %d at %p (tot %d).\n",           \
 370                (int)(size), ptr, atomic_read(&obd_memory));                   \
 371         POISON(ptr, 0x5a, size);                                              \
 372         cfs_free_large(ptr);                                                  \
 373         (ptr) = (void *)0xdeadbeef;                                           \
 374 } while (0)
 375 #endif
 376
 377 /* we memset() the slab object to 0 when allocation succeeds, so DO NOT
 378  * HAVE A CTOR THAT DOES ANYTHING.  its work will be cleared here.  we'd
 379  * love to assert on that, but slab.c keeps kmem_cache_s all to itself. */
 380 #define OBD_SLAB_ALLOC(ptr, slab, type, size)                                 \
 381 do {                                                                          \
 382         LASSERT(!in_interrupt());                                             \
 383         (ptr) = cfs_mem_cache_alloc(slab, (type));                            \
 384         if ((ptr) == NULL) {                                                  \
 385                 CERROR("slab-alloc of '"#ptr"' (%d bytes) failed at %s:%d\n", \
 386                        (int)(size), __FILE__, __LINE__);                      \
 387                 CERROR("%d total bytes allocated by Lustre, %d by Portals\n", \
 388                        atomic_read(&obd_memory), atomic_read(&libcfs_kmemory));\
 389         } else {                                                              \
 390                 memset(ptr, 0, size);                                         \
 391                 atomic_add(size, &obd_memory);                                \
 392                 if (atomic_read(&obd_memory) > obd_memmax)                    \
 393                         obd_memmax = atomic_read(&obd_memory);                \
 394                 CDEBUG(D_MALLOC, "slab-alloced '"#ptr"': %d at %p (tot %d)\n",\
 395                        (int)(size), ptr, atomic_read(&obd_memory));           \
 396         }                                                                     \
 397 } while (0)
 398
 399 #define OBD_FREE_PTR(ptr) OBD_FREE(ptr, sizeof *(ptr))
 400
 401 #define OBD_SLAB_FREE(ptr, slab, size)                                        \
 402 do {                                                                          \
 403         LASSERT(ptr);                                                         \
 404         CDEBUG(D_MALLOC, "slab-freed '" #ptr "': %d at %p (tot %d).\n",       \
 405                (int)(size), ptr, atomic_read(&obd_memory));                   \
 406         atomic_sub(size, &obd_memory);                                        \
 407         POISON(ptr, 0x5a, size);                                              \
 408         cfs_mem_cache_free(slab, ptr);                                        \
 409         (ptr) = (void *)0xdeadbeef;                                           \
 410 } while (0)
 411
 412 #define KEY_IS(str) (keylen >= strlen(key) && strcmp(key, str) == 0)
 413
 414 #if defined(__linux__)
 415 #include <linux/obd_support.h>
 416 #elif defined(__APPLE__)
 417 #include <darwin/obd_support.h>
 418 #elif defined(__WINNT__)
 419 #include <winnt/obd_support.h>
 420 #else
 421 #error Unsupported operating system.
 422 #endif
 423
 424 #endif