module/spl/spl-generic.c

   1 /*****************************************************************************\
   2  *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
   3  *  Copyright (C) 2007 The Regents of the University of California.
   4  *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
   5  *  Written by Brian Behlendorf <behlendorf1@llnl.gov>.
   6  *  UCRL-CODE-235197
   7  *
   8  *  This file is part of the SPL, Solaris Porting Layer.
   9  *  For details, see <http://github.com/behlendorf/spl/>.
  10  *
  11  *  The SPL is free software; you can redistribute it and/or modify it
  12  *  under the terms of the GNU General Public License as published by the
  13  *  Free Software Foundation; either version 2 of the License, or (at your
  14  *  option) any later version.
  15  *
  16  *  The SPL is distributed in the hope that it will be useful, but WITHOUT
  17  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  18  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  19  *  for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License along
  22  *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
  23  *****************************************************************************
  24  *  Solaris Porting Layer (SPL) Generic Implementation.
  25 \*****************************************************************************/
  26
  27 #include <sys/sysmacros.h>
  28 #include <sys/systeminfo.h>
  29 #include <sys/vmsystm.h>
  30 #include <sys/kobj.h>
  31 #include <sys/kmem.h>
  32 #include <sys/mutex.h>
  33 #include <sys/rwlock.h>
  34 #include <sys/taskq.h>
  35 #include <sys/tsd.h>
  36 #include <sys/zmod.h>
  37 #include <sys/debug.h>
  38 #include <sys/proc.h>
  39 #include <sys/kstat.h>
  40 #include <sys/utsname.h>
  41 #include <sys/file.h>
  42 #include <linux/kmod.h>
  43 #include <linux/proc_compat.h>
  44 #include <spl-debug.h>
  45
  46 #ifdef SS_DEBUG_SUBSYS
  47 #undef SS_DEBUG_SUBSYS
  48 #endif
  49
  50 #define SS_DEBUG_SUBSYS SS_GENERIC
  51
  52 char spl_version[32] = "SPL v" SPL_META_VERSION "-" SPL_META_RELEASE;
  53 EXPORT_SYMBOL(spl_version);
  54
  55 unsigned long spl_hostid = HW_INVALID_HOSTID;
  56 EXPORT_SYMBOL(spl_hostid);
  57 module_param(spl_hostid, ulong, 0644);
  58 MODULE_PARM_DESC(spl_hostid, "The system hostid.");
  59
  60 char hw_serial[HW_HOSTID_LEN] = "<none>";
  61 EXPORT_SYMBOL(hw_serial);
  62
  63 proc_t p0 = { 0 };
  64 EXPORT_SYMBOL(p0);
  65
  66 #ifndef HAVE_KALLSYMS_LOOKUP_NAME
  67 kallsyms_lookup_name_t spl_kallsyms_lookup_name_fn = SYMBOL_POISON;
  68 #endif
  69
  70 int
  71 highbit(unsigned long i)
  72 {
  73         register int h = 1;
  74         SENTRY;
  75
  76         if (i == 0)
  77                 SRETURN(0);
  78 #if BITS_PER_LONG == 64
  79         if (i & 0xffffffff00000000ul) {
  80                 h += 32; i >>= 32;
  81         }
  82 #endif
  83         if (i & 0xffff0000) {
  84                 h += 16; i >>= 16;
  85         }
  86         if (i & 0xff00) {
  87                 h += 8; i >>= 8;
  88         }
  89         if (i & 0xf0) {
  90                 h += 4; i >>= 4;
  91         }
  92         if (i & 0xc) {
  93                 h += 2; i >>= 2;
  94         }
  95         if (i & 0x2) {
  96                 h += 1;
  97         }
  98         SRETURN(h);
  99 }
 100 EXPORT_SYMBOL(highbit);
 101
 102 #if BITS_PER_LONG == 32
 103 /*
 104  * Support 64/64 => 64 division on a 32-bit platform.  While the kernel
 105  * provides a div64_u64() function for this we do not use it because the
 106  * implementation is flawed.  There are cases which return incorrect
 107  * results as late as linux-2.6.35.  Until this is fixed upstream the
 108  * spl must provide its own implementation.
 109  *
 110  * This implementation is a slightly modified version of the algorithm
 111  * proposed by the book 'Hacker's Delight'.  The original source can be
 112  * found here and is available for use without restriction.
 113  *
 114  * http://www.hackersdelight.org/HDcode/newCode/divDouble.c
 115  */
 116
 117 /*
 118  * Calculate number of leading of zeros for a 64-bit value.
 119  */
 120 static int
 121 nlz64(uint64_t x) {
 122         register int n = 0;
 123
 124         if (x == 0)
 125                 return 64;
 126
 127         if (x <= 0x00000000FFFFFFFFULL) {n = n + 32; x = x << 32;}
 128         if (x <= 0x0000FFFFFFFFFFFFULL) {n = n + 16; x = x << 16;}
 129         if (x <= 0x00FFFFFFFFFFFFFFULL) {n = n +  8; x = x <<  8;}
 130         if (x <= 0x0FFFFFFFFFFFFFFFULL) {n = n +  4; x = x <<  4;}
 131         if (x <= 0x3FFFFFFFFFFFFFFFULL) {n = n +  2; x = x <<  2;}
 132         if (x <= 0x7FFFFFFFFFFFFFFFULL) {n = n +  1;}
 133
 134         return n;
 135 }
 136
 137 /*
 138  * Newer kernels have a div_u64() function but we define our own
 139  * to simplify portibility between kernel versions.
 140  */
 141 static inline uint64_t
 142 __div_u64(uint64_t u, uint32_t v)
 143 {
 144         (void) do_div(u, v);
 145         return u;
 146 }
 147
 148 /*
 149  * Implementation of 64-bit unsigned division for 32-bit machines.
 150  *
 151  * First the procedure takes care of the case in which the divisor is a
 152  * 32-bit quantity. There are two subcases: (1) If the left half of the
 153  * dividend is less than the divisor, one execution of do_div() is all that
 154  * is required (overflow is not possible). (2) Otherwise it does two
 155  * divisions, using the grade school method.
 156  */
 157 uint64_t
 158 __udivdi3(uint64_t u, uint64_t v)
 159 {
 160         uint64_t u0, u1, v1, q0, q1, k;
 161         int n;
 162
 163         if (v >> 32 == 0) {                     // If v < 2**32:
 164                 if (u >> 32 < v) {              // If u/v cannot overflow,
 165                         return __div_u64(u, v); // just do one division.
 166                 } else {                        // If u/v would overflow:
 167                         u1 = u >> 32;           // Break u into two halves.
 168                         u0 = u & 0xFFFFFFFF;
 169                         q1 = __div_u64(u1, v);  // First quotient digit.
 170                         k  = u1 - q1 * v;       // First remainder, < v.
 171                         u0 += (k << 32);
 172                         q0 = __div_u64(u0, v);  // Seconds quotient digit.
 173                         return (q1 << 32) + q0;
 174                 }
 175         } else {                                // If v >= 2**32:
 176                 n = nlz64(v);                   // 0 <= n <= 31.
 177                 v1 = (v << n) >> 32;            // Normalize divisor, MSB is 1.
 178                 u1 = u >> 1;                    // To ensure no overflow.
 179                 q1 = __div_u64(u1, v1);         // Get quotient from
 180                 q0 = (q1 << n) >> 31;           // Undo normalization and
 181                                                 // division of u by 2.
 182                 if (q0 != 0)                    // Make q0 correct or
 183                         q0 = q0 - 1;            // too small by 1.
 184                 if ((u - q0 * v) >= v)
 185                         q0 = q0 + 1;            // Now q0 is correct.
 186
 187                 return q0;
 188         }
 189 }
 190 EXPORT_SYMBOL(__udivdi3);
 191
 192 /*
 193  * Implementation of 64-bit signed division for 32-bit machines.
 194  */
 195 int64_t
 196 __divdi3(int64_t u, int64_t v)
 197 {
 198         int64_t q, t;
 199         q = __udivdi3(abs64(u), abs64(v));
 200         t = (u ^ v) >> 63;      // If u, v have different
 201         return (q ^ t) - t;     // signs, negate q.
 202 }
 203 EXPORT_SYMBOL(__divdi3);
 204
 205 /*
 206  * Implementation of 64-bit unsigned modulo for 32-bit machines.
 207  */
 208 uint64_t
 209 __umoddi3(uint64_t dividend, uint64_t divisor)
 210 {
 211         return (dividend - (divisor * __udivdi3(dividend, divisor)));
 212 }
 213 EXPORT_SYMBOL(__umoddi3);
 214
 215 #if defined(__arm) || defined(__arm__)
 216 /*
 217  * Implementation of 64-bit unsigned division for 32-bit arm machines.
 218  */
 219 uint64_t
 220 __aeabi_uldivmod(uint64_t u, uint64_t v)
 221 {
 222         return __udivdi3(u, v);
 223 }
 224 EXPORT_SYMBOL(__aeabi_uldivmod);
 225
 226 /*
 227  * Implementation of 64-bit signed division for 32-bit arm machines.
 228  */
 229 int64_t
 230 __aeabi_ldivmod(int64_t u, int64_t v)
 231 {
 232         return __divdi3(u, v);
 233 }
 234 EXPORT_SYMBOL(__aeabi_ldivmod);
 235 #endif /* __arm || __arm__ */
 236 #endif /* BITS_PER_LONG */
 237
 238 /* NOTE: The strtoxx behavior is solely based on my reading of the Solaris
 239  * ddi_strtol(9F) man page.  I have not verified the behavior of these
 240  * functions against their Solaris counterparts.  It is possible that I
 241  * may have misinterpreted the man page or the man page is incorrect.
 242  */
 243 int ddi_strtoul(const char *, char **, int, unsigned long *);
 244 int ddi_strtol(const char *, char **, int, long *);
 245 int ddi_strtoull(const char *, char **, int, unsigned long long *);
 246 int ddi_strtoll(const char *, char **, int, long long *);
 247
 248 #define define_ddi_strtoux(type, valtype)                               \
 249 int ddi_strtou##type(const char *str, char **endptr,                    \
 250                      int base, valtype *result)                         \
 251 {                                                                       \
 252         valtype last_value, value = 0;                                  \
 253         char *ptr = (char *)str;                                        \
 254         int flag = 1, digit;                                            \
 255                                                                         \
 256         if (strlen(ptr) == 0)                                           \
 257                 return EINVAL;                                          \
 258                                                                         \
 259         /* Auto-detect base based on prefix */                          \
 260         if (!base) {                                                    \
 261                 if (str[0] == '0') {                                    \
 262                         if (tolower(str[1])=='x' && isxdigit(str[2])) { \
 263                                 base = 16; /* hex */                    \
 264                                 ptr += 2;                               \
 265                         } else if (str[1] >= '0' && str[1] < 8) {       \
 266                                 base = 8; /* octal */                   \
 267                                 ptr += 1;                               \
 268                         } else {                                        \
 269                                 return EINVAL;                          \
 270                         }                                               \
 271                 } else {                                                \
 272                         base = 10; /* decimal */                        \
 273                 }                                                       \
 274         }                                                               \
 275                                                                         \
 276         while (1) {                                                     \
 277                 if (isdigit(*ptr))                                      \
 278                         digit = *ptr - '0';                             \
 279                 else if (isalpha(*ptr))                                 \
 280                         digit = tolower(*ptr) - 'a' + 10;               \
 281                 else                                                    \
 282                         break;                                          \
 283                                                                         \
 284                 if (digit >= base)                                      \
 285                         break;                                          \
 286                                                                         \
 287                 last_value = value;                                     \
 288                 value = value * base + digit;                           \
 289                 if (last_value > value) /* Overflow */                  \
 290                         return ERANGE;                                  \
 291                                                                         \
 292                 flag = 1;                                               \
 293                 ptr++;                                                  \
 294         }                                                               \
 295                                                                         \
 296         if (flag)                                                       \
 297                 *result = value;                                        \
 298                                                                         \
 299         if (endptr)                                                     \
 300                 *endptr = (char *)(flag ? ptr : str);                   \
 301                                                                         \
 302         return 0;                                                       \
 303 }                                                                       \
 304
 305 #define define_ddi_strtox(type, valtype)                                \
 306 int ddi_strto##type(const char *str, char **endptr,                     \
 307                        int base, valtype *result)                       \
 308 {                                                                       \
 309         int rc;                                                         \
 310                                                                         \
 311         if (*str == '-') {                                              \
 312                 rc = ddi_strtou##type(str + 1, endptr, base, result);   \
 313                 if (!rc) {                                              \
 314                         if (*endptr == str + 1)                         \
 315                                 *endptr = (char *)str;                  \
 316                         else                                            \
 317                                 *result = -*result;                     \
 318                 }                                                       \
 319         } else {                                                        \
 320                 rc = ddi_strtou##type(str, endptr, base, result);       \
 321         }                                                               \
 322                                                                         \
 323         return rc;                                                      \
 324 }
 325
 326 define_ddi_strtoux(l, unsigned long)
 327 define_ddi_strtox(l, long)
 328 define_ddi_strtoux(ll, unsigned long long)
 329 define_ddi_strtox(ll, long long)
 330
 331 EXPORT_SYMBOL(ddi_strtoul);
 332 EXPORT_SYMBOL(ddi_strtol);
 333 EXPORT_SYMBOL(ddi_strtoll);
 334 EXPORT_SYMBOL(ddi_strtoull);
 335
 336 int
 337 ddi_copyin(const void *from, void *to, size_t len, int flags)
 338 {
 339         /* Fake ioctl() issued by kernel, 'from' is a kernel address */
 340         if (flags & FKIOCTL) {
 341                 memcpy(to, from, len);
 342                 return 0;
 343         }
 344
 345         return copyin(from, to, len);
 346 }
 347 EXPORT_SYMBOL(ddi_copyin);
 348
 349 int
 350 ddi_copyout(const void *from, void *to, size_t len, int flags)
 351 {
 352         /* Fake ioctl() issued by kernel, 'from' is a kernel address */
 353         if (flags & FKIOCTL) {
 354                 memcpy(to, from, len);
 355                 return 0;
 356         }
 357
 358         return copyout(from, to, len);
 359 }
 360 EXPORT_SYMBOL(ddi_copyout);
 361
 362 #ifndef HAVE_PUT_TASK_STRUCT
 363 /*
 364  * This is only a stub function which should never be used.  The SPL should
 365  * never be putting away the last reference on a task structure so this will
 366  * not be called.  However, we still need to define it so the module does not
 367  * have undefined symbol at load time.  That all said if this impossible
 368  * thing does somehow happen PANIC immediately so we know about it.
 369  */
 370 void
 371 __put_task_struct(struct task_struct *t)
 372 {
 373         PANIC("Unexpectly put last reference on task %d\n", (int)t->pid);
 374 }
 375 EXPORT_SYMBOL(__put_task_struct);
 376 #endif /* HAVE_PUT_TASK_STRUCT */
 377
 378 struct new_utsname *__utsname(void)
 379 {
 380 #ifdef HAVE_INIT_UTSNAME
 381         return init_utsname();
 382 #else
 383         return &system_utsname;
 384 #endif
 385 }
 386 EXPORT_SYMBOL(__utsname);
 387
 388
 389 /*
 390  * Read the unique system identifier from the /etc/hostid file.
 391  *
 392  * The behavior of /usr/bin/hostid on Linux systems with the
 393  * regular eglibc and coreutils is:
 394  *
 395  *   1. Generate the value if the /etc/hostid file does not exist
 396  *      or if the /etc/hostid file is less than four bytes in size.
 397  *
 398  *   2. If the /etc/hostid file is at least 4 bytes, then return
 399  *      the first four bytes [0..3] in native endian order.
 400  *
 401  *   3. Always ignore bytes [4..] if they exist in the file.
 402  *
 403  * Only the first four bytes are significant, even on systems that
 404  * have a 64-bit word size.
 405  *
 406  * See:
 407  *
 408  *   eglibc: sysdeps/unix/sysv/linux/gethostid.c
 409  *   coreutils: src/hostid.c
 410  *
 411  * Notes:
 412  *
 413  * The /etc/hostid file on Solaris is a text file that often reads:
 414  *
 415  *   # DO NOT EDIT
 416  *   "0123456789"
 417  *
 418  * Directly copying this file to Linux results in a constant
 419  * hostid of 4f442023 because the default comment constitutes
 420  * the first four bytes of the file.
 421  *
 422  */
 423
 424 char *spl_hostid_path = HW_HOSTID_PATH;
 425 module_param(spl_hostid_path, charp, 0444);
 426 MODULE_PARM_DESC(spl_hostid_path, "The system hostid file (/etc/hostid)");
 427
 428 static int
 429 hostid_read(void)
 430 {
 431         int result;
 432         uint64_t size;
 433         struct _buf *file;
 434         unsigned long hostid = 0;
 435
 436         file = kobj_open_file(spl_hostid_path);
 437
 438         if (file == (struct _buf *)-1)
 439                 return -1;
 440
 441         result = kobj_get_filesize(file, &size);
 442
 443         if (result != 0) {
 444                 printk(KERN_WARNING
 445                        "SPL: kobj_get_filesize returned %i on %s\n",
 446                        result, spl_hostid_path);
 447                 kobj_close_file(file);
 448                 return -2;
 449         }
 450
 451         if (size < sizeof(HW_HOSTID_MASK)) {
 452                 printk(KERN_WARNING
 453                        "SPL: Ignoring the %s file because it is %llu bytes; "
 454                        "expecting %lu bytes instead.\n",
 455                        spl_hostid_path, size, sizeof(HW_HOSTID_MASK));
 456                 kobj_close_file(file);
 457                 return -3;
 458         }
 459
 460         /* Read directly into the variable like eglibc does. */
 461         /* Short reads are okay; native behavior is preserved. */
 462         result = kobj_read_file(file, (char *)&hostid, sizeof(hostid), 0);
 463
 464         if (result < 0) {
 465                 printk(KERN_WARNING
 466                        "SPL: kobj_read_file returned %i on %s\n",
 467                        result, spl_hostid_path);
 468                 kobj_close_file(file);
 469                 return -4;
 470         }
 471
 472         /* Mask down to 32 bits like coreutils does. */
 473         spl_hostid = hostid & HW_HOSTID_MASK;
 474         kobj_close_file(file);
 475         return 0;
 476 }
 477
 478 #define GET_HOSTID_CMD \
 479         "exec 0</dev/null " \
 480         "     1>/proc/sys/kernel/spl/hostid " \
 481         "     2>/dev/null; " \
 482         "hostid"
 483
 484 static int
 485 hostid_exec(void)
 486 {
 487         char *argv[] = { "/bin/sh",
 488                          "-c",
 489                          GET_HOSTID_CMD,
 490                          NULL };
 491         char *envp[] = { "HOME=/",
 492                          "TERM=linux",
 493                          "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
 494                          NULL };
 495         int rc;
 496
 497         /* Doing address resolution in the kernel is tricky and just
 498          * not a good idea in general.  So to set the proper 'hw_serial'
 499          * use the usermodehelper support to ask '/bin/sh' to run
 500          * '/usr/bin/hostid' and redirect the result to /proc/sys/spl/hostid
 501          * for us to use.  It's a horrific solution but it will do for now.
 502          */
 503         rc = call_usermodehelper(argv[0], argv, envp, 1);
 504         if (rc)
 505                 printk("SPL: Failed user helper '%s %s %s', rc = %d\n",
 506                        argv[0], argv[1], argv[2], rc);
 507
 508         return rc;
 509 }
 510
 511 uint32_t
 512 zone_get_hostid(void *zone)
 513 {
 514         unsigned long hostid;
 515
 516         /* Only the global zone is supported */
 517         ASSERT(zone == NULL);
 518
 519         if (ddi_strtoul(hw_serial, NULL, HW_HOSTID_LEN-1, &hostid) != 0)
 520                 return HW_INVALID_HOSTID;
 521
 522         return (uint32_t)hostid;
 523 }
 524 EXPORT_SYMBOL(zone_get_hostid);
 525
 526 #ifndef HAVE_KALLSYMS_LOOKUP_NAME
 527 /*
 528  * The kallsyms_lookup_name() kernel function is not an exported symbol in
 529  * Linux 2.6.19 through 2.6.32 inclusive.
 530  *
 531  * This function replaces the functionality by performing an upcall to user
 532  * space where /proc/kallsyms is consulted for the requested address.
 533  *
 534  */
 535
 536 #define GET_KALLSYMS_ADDR_CMD \
 537         "exec 0</dev/null " \
 538         "     1>/proc/sys/kernel/spl/kallsyms_lookup_name " \
 539         "     2>/dev/null; " \
 540         "awk  '{ if ( $3 == \"kallsyms_lookup_name\" ) { print $1 } }' " \
 541         "     /proc/kallsyms "
 542
 543 static int
 544 set_kallsyms_lookup_name(void)
 545 {
 546         char *argv[] = { "/bin/sh",
 547                          "-c",
 548                          GET_KALLSYMS_ADDR_CMD,
 549                          NULL };
 550         char *envp[] = { "HOME=/",
 551                          "TERM=linux",
 552                          "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
 553                          NULL };
 554         int rc;
 555
 556         rc = call_usermodehelper(argv[0], argv, envp, 1);
 557         if (rc)
 558                 printk("SPL: Failed user helper '%s %s %s', rc = %d\n",
 559                        argv[0], argv[1], argv[2], rc);
 560
 561         return rc;
 562 }
 563 #endif
 564
 565 static int
 566 __init spl_init(void)
 567 {
 568         int rc = 0;
 569
 570         if ((rc = spl_debug_init()))
 571                 return rc;
 572
 573         if ((rc = spl_kmem_init()))
 574                 SGOTO(out1, rc);
 575
 576         if ((rc = spl_mutex_init()))
 577                 SGOTO(out2, rc);
 578
 579         if ((rc = spl_rw_init()))
 580                 SGOTO(out3, rc);
 581
 582         if ((rc = spl_taskq_init()))
 583                 SGOTO(out4, rc);
 584
 585         if ((rc = spl_vn_init()))
 586                 SGOTO(out5, rc);
 587
 588         if ((rc = spl_proc_init()))
 589                 SGOTO(out6, rc);
 590
 591         if ((rc = spl_kstat_init()))
 592                 SGOTO(out7, rc);
 593
 594         if ((rc = spl_tsd_init()))
 595                 SGOTO(out8, rc);
 596
 597         if ((rc = spl_zlib_init()))
 598                 SGOTO(out9, rc);
 599
 600         /*
 601          * Get the hostid if it was not passed as a module parameter. Try
 602          * reading the /etc/hostid file directly, and then fall back to calling
 603          * the /usr/bin/hostid utility.
 604          */
 605
 606         if (spl_hostid == HW_INVALID_HOSTID
 607           && (rc = hostid_read()) && (rc = hostid_exec()))
 608                 SGOTO(out10, rc = -EADDRNOTAVAIL);
 609
 610 #ifndef HAVE_KALLSYMS_LOOKUP_NAME
 611         if ((rc = set_kallsyms_lookup_name()))
 612                 SGOTO(out10, rc = -EADDRNOTAVAIL);
 613 #endif /* HAVE_KALLSYMS_LOOKUP_NAME */
 614
 615         if ((rc = spl_kmem_init_kallsyms_lookup()))
 616                 SGOTO(out10, rc);
 617
 618         if ((rc = spl_vn_init_kallsyms_lookup()))
 619                 SGOTO(out10, rc);
 620
 621         printk(KERN_NOTICE "SPL: Loaded module v%s-%s%s, using hostid "
 622                "0x%08x\n", SPL_META_VERSION, SPL_META_RELEASE, SPL_DEBUG_STR,
 623                (unsigned int) spl_hostid);
 624         SRETURN(rc);
 625 out10:
 626         spl_zlib_fini();
 627 out9:
 628         spl_tsd_fini();
 629 out8:
 630         spl_kstat_fini();
 631 out7:
 632         spl_proc_fini();
 633 out6:
 634         spl_vn_fini();
 635 out5:
 636         spl_taskq_fini();
 637 out4:
 638         spl_rw_fini();
 639 out3:
 640         spl_mutex_fini();
 641 out2:
 642         spl_kmem_fini();
 643 out1:
 644         spl_debug_fini();
 645
 646         printk(KERN_NOTICE "SPL: Failed to Load Solaris Porting Layer "
 647                "v%s-%s%s, rc = %d\n", SPL_META_VERSION, SPL_META_RELEASE,
 648                SPL_DEBUG_STR, rc);
 649         return rc;
 650 }
 651
 652 static void
 653 spl_fini(void)
 654 {
 655         SENTRY;
 656
 657         printk(KERN_NOTICE "SPL: Unloaded module v%s-%s%s\n",
 658                SPL_META_VERSION, SPL_META_RELEASE, SPL_DEBUG_STR);
 659         spl_zlib_fini();
 660         spl_tsd_fini();
 661         spl_kstat_fini();
 662         spl_proc_fini();
 663         spl_vn_fini();
 664         spl_taskq_fini();
 665         spl_rw_fini();
 666         spl_mutex_fini();
 667         spl_kmem_fini();
 668         spl_debug_fini();
 669 }
 670
 671 /* Called when a dependent module is loaded */
 672 void
 673 spl_setup(void)
 674 {
 675         int rc;
 676
 677         /*
 678          * At module load time the pwd is set to '/' on a Solaris system.
 679          * On a Linux system will be set to whatever directory the caller
 680          * was in when executing insmod/modprobe.
 681          */
 682         rc = vn_set_pwd("/");
 683         if (rc)
 684                 printk("SPL: Warning unable to set pwd to '/': %d\n", rc);
 685 }
 686 EXPORT_SYMBOL(spl_setup);
 687
 688 /* Called when a dependent module is unloaded */
 689 void
 690 spl_cleanup(void)
 691 {
 692 }
 693 EXPORT_SYMBOL(spl_cleanup);
 694
 695 module_init(spl_init);
 696 module_exit(spl_fini);
 697
 698 MODULE_AUTHOR("Lawrence Livermore National Labs");
 699 MODULE_DESCRIPTION("Solaris Porting Layer");
 700 MODULE_LICENSE("GPL");