config/lustre-build-zfs.m4

   1 dnl #
   2 dnl # Supported configure options.  When no options are specified support
   3 dnl # for ZFS OSDs will be autodetected assuming server support is enabled.
   4 dnl # If the ZFS OSD cannot be built support for it is disabled and a
   5 dnl # warning is issued but the configure process is allowed to continue.
   6 dnl #
   7 dnl # --without-zfs   - Disable zfs support.
   8 dnl # --with-zfs=no
   9 dnl #
  10 dnl # --with-zfs      - Enable zfs support and attempt to autodetect the zfs
  11 dnl # --with-zfs=yes    headers in one of the following places.  Because zfs
  12 dnl #                   support was explicitly required if the headers cannot
  13 dnl #                   be located it is treated as a fatal error.
  14 dnl #
  15 dnl #                       * /var/lib/dkms/zfs/${VERSION}/source
  16 dnl #                       * /usr/src/zfs-${VERSION}/${LINUXRELEASE}
  17 dnl #                       * /usr/src/zfs-${VERSION}
  18 dnl #                       * ../spl/
  19 dnl #                       * $LINUX
  20 dnl #
  21 dnl # --with-zfs-devel=path
  22 dnl #                 - User provided directory where zfs development headers
  23 dnl #                   are located. This option is typically used when user
  24 dnl #                   uses rpm2cpio to unpack src rpm.
  25 dnl #                   Assumes layout of:
  26 dnl #                     ${zfs-devel-path}/usr/include/libzfs
  27 dnl #                     ${zfs-devel-path}/usr/include/libspl
  28 dnl #                     ${zfs-devel-path}/lib64/libzfs.so.* or
  29 dnl #                     ${zfs-devel-path}/lib/libzfs.so.*
  30 dnl #
  31 dnl # --with-zfs=path - Enable zfs support and use the zfs headers in the
  32 dnl #                   provided path.  No autodetection is performed and
  33 dnl #                   if no headers are found this is a fatal error.
  34 dnl #
  35 dnl # --with-zfs-obj  - When zfs support is enabled the object directory
  36 dnl #                   will be based on the --with-zfs directory.  If this
  37 dnl #                   is detected incorrectly it can be explicitly
  38 dnl #                   specified using this option.
  39 dnl #
  40 dnl # --without-spl   - Disable spl support.
  41 dnl # --with-spl=no
  42 dnl #
  43 dnl # --with-spl      - Enable spl support and attempt to autodetect the spl
  44 dnl # --with-spl=yes    headers in one of the following places in this order:
  45 dnl #                   * /var/lib/dkms/spl/${VERSION}/source
  46 dnl #                   * /usr/src/spl-${VERSION}/${LINUXRELEASE}
  47 dnl #                   * /usr/src/spl-${VERSION}
  48 dnl #                   * ../spl/
  49 dnl #                   * $LINUX
  50 dnl #
  51 dnl # --with-spl=path - Enable spl support and use the spl headers in the
  52 dnl #                   provided path.  No autodetection is performed.
  53 dnl #
  54 dnl # --with-spl-obj  - When spl support is enabled the object directory
  55 dnl #                   will be based on the --with-spl directory.  If this
  56 dnl #                   is detected incorrectly it can be explicitly
  57 dnl #                   specified using this option.
  58 dnl #
  59 AC_DEFUN([LB_SPL], [
  60         AC_ARG_WITH([spl],
  61                 AS_HELP_STRING([--with-spl=PATH],
  62                 [Path to spl source]),
  63                 [splsrc="$withval"])
  64
  65         AC_ARG_WITH([spl-obj],
  66                 AS_HELP_STRING([--with-spl-obj=PATH],
  67                 [Path to spl build objects]),
  68                 [splobj="$withval"])
  69
  70         dnl #
  71         dnl # The existence of spl.release[.in] is used to identify a valid
  72         dnl # source directory.  In order of preference:
  73         dnl #
  74         splver=$(ls -1 /usr/src/ | grep -m1 spl | cut -f2 -d'-')
  75         spldkms="/var/lib/dkms/spl/${splver}"
  76         splsrc1="/usr/src/spl-${splver}/${LINUXRELEASE}"
  77         splsrc2="/usr/src/spl-${splver}"
  78         splsrc3="../spl/"
  79         splsrc4="$LINUX"
  80
  81         AC_MSG_CHECKING([spl source directory])
  82         AS_IF([test -z "${splsrc}"], [
  83                 AS_IF([test -e "${spldkms}/source/spl.release.in"], [
  84                         splsrc=${spldkms}/source
  85                 ], [test -e "${splsrc1}/spl.release.in"], [
  86                         splsrc=${splsrc1}
  87                 ], [test -e "${splsrc2}/spl.release.in"], [
  88                         splsrc=${splsrc2}
  89                 ], [test -e "${splsrc3}/spl.release.in"], [
  90                         splsrc=$(readlink -f "${splsrc3}")
  91                 ], [test -e "${splsrc4}/spl.release.in"], [
  92                         splsrc=${splsrc4}
  93                 ], [
  94                         splsrc="[Not found]"
  95                 ])
  96         ])
  97         AC_MSG_RESULT([$splsrc])
  98
  99         AS_IF([test ! -e "$splsrc/spl.release" &&
 100             test ! -e "$splsrc/spl.release.in"], [
 101                 enable_zfs=no
 102         ])
 103
 104         dnl #
 105         dnl # The existence of the spl_config.h is used to identify a valid
 106         dnl # spl object directory.  In many cases the object and source
 107         dnl # directory are the same, however the objects may also reside
 108         dnl # is a subdirectory named after the kernel version.  When
 109         dnl # weak modules are used, the kernel version may not be the
 110         dnl # same as the LINUXRELEASE against which we are building lustre.
 111         dnl #
 112         AC_MSG_CHECKING([spl build directory])
 113         AS_IF([test -z "$splobj"], [
 114                 last_spl_obj_dir=$(ls -d ${splsrc}/[[0-9]]*/ | tail -n 1 | sed 's|/$||')
 115                 AS_IF([test "${splsrc}" = "${spldkms}/source"], [
 116                         AS_IF([test -e "${spldkms}/${LINUXRELEASE}/${target_cpu}/spl_config.h"], [
 117                                 splobj=${spldkms}/${LINUXRELEASE}/${target_cpu}
 118                         ], [
 119                                 splobj="[Not found]"
 120                         ])
 121                 ],[test -e "${splsrc}/${LINUXRELEASE}/spl_config.h"], [
 122                         splobj="${splsrc}/${LINUXRELEASE}"
 123                 ], [test -e "${splsrc}/spl_config.h"], [
 124                         splobj="${splsrc}"
 125                 ], [test -e "${last_spl_obj_dir}/spl_config.h"], [
 126                         splobj="${last_spl_obj_dir}"
 127                 ], [
 128                         splobj="[Not found]"
 129                 ])
 130         ])
 131         AC_MSG_RESULT([$splobj])
 132
 133         AS_IF([test ! -e "$splobj/spl_config.h"], [
 134                 enable_zfs=no
 135         ])
 136
 137         dnl #
 138         dnl # Verify the source version using SPL_META_VERSION in spl_config.h
 139         dnl #
 140         AS_IF([test x$enable_zfs = xyes], [
 141                 AC_MSG_CHECKING([spl source version])
 142                 AS_IF([fgrep -q SPL_META_VERSION $splobj/spl_config.h], [
 143                         splver=$((echo "#include <spl_config.h>";
 144                             echo "splver=SPL_META_VERSION-SPL_META_RELEASE") |
 145                             cpp -I $splobj |
 146                             grep "^splver=" | tr -d \" | cut -d= -f2)
 147                 ], [
 148                         splver="[Not found]"
 149                         enable_zfs=no
 150                 ])
 151                 AC_MSG_RESULT([$splver])
 152         ])
 153
 154         dnl #
 155         dnl # Verify the modules systems exist by the expect name.
 156         dnl #
 157         AS_IF([test x$enable_zfs = xyes], [
 158                 AC_MSG_CHECKING([spl file name for module symbols])
 159                 AS_IF([test -r $splobj/$SYMVERFILE], [
 160                         splsym=$SYMVERFILE
 161                         EXTRA_SYMBOLS="$EXTRA_SYMBOLS $splobj/$SYMVERFILE"
 162                 ], [test -r $splobj/module/$SYMVERFILE], [
 163                         splsym=$SYMVERFILE
 164                         EXTRA_SYMBOLS="$EXTRA_SYMBOLS $splobj/module/$SYMVERFILE"
 165                 ], [
 166                         splsym="[Not found]"
 167                         enable_zfs=no
 168                 ])
 169                 AC_MSG_RESULT([$splsym])
 170         ])
 171
 172         SPL=${splsrc}
 173         SPL_OBJ=${splobj}
 174         SPL_VERSION=${splver}
 175
 176         AC_SUBST(SPL)
 177         AC_SUBST(SPL_OBJ)
 178         AC_SUBST(SPL_VERSION)
 179         AC_SUBST(EXTRA_SYMBOLS)
 180 ])
 181
 182 AC_DEFUN([LB_ZFS], [
 183         AC_ARG_WITH([zfs-obj],
 184                 AS_HELP_STRING([--with-zfs-obj=PATH],
 185                 [Path to zfs build objects]),
 186                 [zfsobj="$withval"])
 187
 188         dnl #
 189         dnl # The existence of zfs.release[.in] is used to identify a valid
 190         dnl # source directory.  In order of preference:
 191         dnl #
 192         zfsver=$(ls -1 /usr/src/ | grep -m1 zfs | cut -f2 -d'-')
 193         zfsdkms="/var/lib/dkms/zfs/${zfsver}"
 194         zfssrc1="/usr/src/zfs-${zfsver}/${LINUXRELEASE}"
 195         zfssrc2="/usr/src/zfs-${zfsver}"
 196         zfssrc3="../zfs/"
 197         zfssrc4="$LINUX"
 198
 199         AC_MSG_CHECKING([zfs source directory])
 200         AS_IF([test -z "${zfssrc}"], [
 201                 AS_IF([test -e "${zfsdkms}/source/zfs.release.in"], [
 202                         zfssrc=${zfsdkms}/source
 203                 ], [test -e "${zfssrc1}/zfs.release.in"], [
 204                         zfssrc=${zfssrc1}
 205                 ], [test -e "${zfssrc2}/zfs.release.in"], [
 206                         zfssrc=${zfssrc2}
 207                 ], [test -e "${zfssrc3}/zfs.release.in"], [
 208                         zfssrc=$(readlink -f "${zfssrc3}")
 209                 ], [test -e "${zfssrc4}/zfs.release.in"], [
 210                         zfssrc=${zfssrc4}
 211                 ], [
 212                         zfssrc="[Not found]"
 213                 ])
 214         ])
 215         AC_MSG_RESULT([$zfssrc])
 216
 217         AS_IF([test ! -e "$zfssrc/zfs.release.in" &&
 218             test ! -e "$zfssrc/zfs.release"], [
 219                 enable_zfs=no
 220         ])
 221
 222         dnl #
 223         dnl # The existence of the zfs_config.h is used to identify a valid
 224         dnl # zfs object directory.  In many cases the object and source
 225         dnl # directory are the same, however the objects may also reside
 226         dnl # is a subdirectory named after the kernel version.  When
 227         dnl # weak modules are used, the kernel version may not be the
 228         dnl # same as the LINUXRELEASE against which we are building lustre.
 229         dnl #
 230         AC_MSG_CHECKING([zfs build directory])
 231         AS_IF([test -z "$zfsobj"], [
 232                 last_zfs_obj_dir=$(ls -d ${zfssrc}/[[0-9]]*/ | tail -n 1 | sed 's|/$||')
 233                 AS_IF([test "${zfssrc}" = "${zfsdkms}/source"], [
 234                         AS_IF([test -e "${zfsdkms}/${LINUXRELEASE}/${target_cpu}/zfs_config.h"], [
 235                                 zfsobj=${zfsdkms}/${LINUXRELEASE}/${target_cpu}
 236                         ], [
 237                                 zfsobj="[Not found]"
 238                         ])
 239                 ], [test -e "${zfssrc}/${LINUXRELEASE}/zfs_config.h"], [
 240                         zfsobj="${zfssrc}/${LINUXRELEASE}"
 241                 ], [test -e "${zfssrc}/zfs_config.h"], [
 242                         zfsobj="${zfssrc}"
 243                 ], [test -e "${last_zfs_obj_dir}/zfs_config.h"], [
 244                         zfsobj="${last_zfs_obj_dir}"
 245                 ], [
 246                         zfsobj="[Not found]"
 247                 ])
 248         ])
 249
 250         AC_MSG_RESULT([$zfsobj])
 251         AS_IF([test ! -e "$zfsobj/zfs_config.h"], [
 252                 enable_zfs=no
 253         ])
 254
 255         dnl #
 256         dnl # Verify the source version using SPL_META_VERSION in spl_config.h
 257         dnl #
 258         AS_IF([test x$enable_zfs = xyes], [
 259                 AC_MSG_CHECKING([zfs source version])
 260                 AS_IF([fgrep -q ZFS_META_VERSION $zfsobj/zfs_config.h], [
 261                         zfsver=$((echo "#include <zfs_config.h>";
 262                             echo "zfsver=ZFS_META_VERSION-ZFS_META_RELEASE") |
 263                             cpp -I $zfsobj |
 264                             grep "^zfsver=" | tr -d \" | cut -d= -f2)
 265                 ],[
 266                         zfsver="[Not found]"
 267                         enable_zfs=no
 268                 ])
 269                 AC_MSG_RESULT([$zfsver])
 270         ])
 271
 272         dnl #
 273         dnl # Verify the modules systems exist by the expect name.
 274         dnl #
 275         AS_IF([test x$enable_zfs = xyes], [
 276                 AC_MSG_CHECKING([zfs file name for module symbols])
 277                 AS_IF([test -r $zfsobj/$SYMVERFILE], [
 278                         zfssym=$SYMVERFILE
 279                         EXTRA_SYMBOLS="$EXTRA_SYMBOLS $zfsobj/$SYMVERFILE"
 280                 ], [test -r $zfsobj/module/$SYMVERFILE], [
 281                         zfssym=$SYMVERFILE
 282                         EXTRA_SYMBOLS="$EXTRA_SYMBOLS $zfsobj/module/$SYMVERFILE"
 283                 ], [
 284                         zfssym="[Not found]"
 285                         enable_zfs=no
 286                 ])
 287                 AC_MSG_RESULT([$zfssym])
 288         ])
 289
 290         ZFS=${zfssrc}
 291         ZFS_OBJ=${zfsobj}
 292         ZFS_VERSION=${zfsver}
 293
 294         AC_SUBST(ZFS)
 295         AC_SUBST(ZFS_OBJ)
 296         AC_SUBST(ZFS_VERSION)
 297         AC_SUBST(EXTRA_SYMBOLS)
 298 ])
 299
 300 AC_DEFUN([LB_ZFS_DEVEL], [
 301         AC_ARG_WITH([zfs-devel],
 302                 [AS_HELP_STRING([--with-zfs-devel=PATH],
 303                 [Path to zfs development headers])],
 304                 [zfsdevel="$withval"])
 305
 306         AC_MSG_CHECKING([user provided zfs devel headers])
 307         AS_IF([test ! -z "${zfsdevel}"], [
 308                 AS_IF([test -d "${zfsdevel}/usr/include/libspl" && test -d "${zfsdevel}/usr/include/libzfs"], [
 309                         zfsinc="-I $zfsdevel/usr/include/libspl -I $zfsdevel/usr/include/libzfs"
 310                         zfslib="-L$zfsdevel/usr/lib64 -L$zfsdevel/usr/lib -L$zfsdevel/lib64 -L$zfsdevel/lib"
 311                 ], [
 312                         AC_MSG_ERROR([Path to development headers directory does not exist])
 313                 ])
 314         ])
 315         AC_MSG_RESULT([$zfsinc])
 316 ])
 317
 318 AC_DEFUN([LB_ZFS_USER], [
 319         dnl #
 320         dnl # Detect user space zfs development headers.
 321         dnl #
 322         AC_MSG_CHECKING([zfs devel headers])
 323         AS_IF([test -z "${zfsinc}"], [
 324                 AS_IF([test -e "${zfssrc}/include/libzfs.h" && test -e "${zfssrc}/lib/libspl/include"], [
 325                         zfsinc="-I $zfssrc/lib/libspl/include -I $zfssrc/include"
 326                         zfslib="-L$zfssrc/lib/libzfs/.libs/"
 327                 ], [test -d /usr/include/libzfs && test -d /usr/include/libspl], [
 328                         zfsinc="-I/usr/include/libspl -I /usr/include/libzfs"
 329                         zfslib=""
 330                 ], [
 331                         zfsinc="[Not Found]"
 332                         zfslib=""
 333                         enable_zfs=no
 334                 ])
 335         ])
 336         AC_MSG_RESULT([$zfsinc])
 337
 338         ZFS_LIBZFS_INCLUDE=${zfsinc}
 339         ZFS_LIBZFS_LDFLAGS="-lzfs ${zfslib}"
 340         AC_SUBST(ZFS_LIBZFS_INCLUDE)
 341         AC_SUBST(ZFS_LIBZFS_LDFLAGS)
 342 ])
 343
 344 AC_DEFUN([LB_CONFIG_ZFS], [
 345         AC_ARG_WITH([zfs],
 346                 [AS_HELP_STRING([--with-zfs=PATH], [Path to zfs source])],
 347                 [
 348                         AS_IF([test x$withval = xno], [
 349                                 enable_zfs=no
 350                                 require_zfs=no
 351                         ], [test x$withval = xyes], [
 352                                 enable_zfs=yes
 353                                 require_zfs=yes
 354                         ], [
 355                                 enable_zfs=yes
 356                                 require_zfs=yes
 357                                 zfssrc="$withval"
 358                         ])
 359                 ], [
 360                         AS_IF([test x$enable_server != xno], [
 361                                 require_zfs=no
 362                                 enable_zfs=yes
 363                         ], [
 364                                 require_zfs=no
 365                                 enable_zfs=no
 366                         ])
 367                 ])
 368
 369         AC_MSG_CHECKING([whether to enable zfs])
 370         AC_MSG_RESULT([$enable_zfs])
 371
 372         AS_IF([test x$enable_zfs = xyes], [
 373                 AS_IF([test x$enable_modules = xyes], [
 374                         LB_SPL
 375                         LB_ZFS
 376                 ])
 377                 LB_ZFS_DEVEL
 378                 LB_ZFS_USER
 379
 380                 dnl #
 381                 dnl # enable_zfs will be set to no in LB_SPL or LB_ZFS if
 382                 dnl # one of more of the build requirements is not met.
 383                 dnl #
 384                 AS_IF([test x$enable_zfs = xyes], [
 385                         AC_DEFINE(HAVE_ZFS_OSD, 1, Enable zfs osd)
 386                 ],[
 387                         AS_IF([test x$require_zfs = xyes], [
 388                                 AC_MSG_ERROR([
 389
 390 Required zfs osd cannot be built due to missing zfs development headers.
 391
 392 Support for zfs can be enabled by downloading the required packages for your
 393 distribution.  See http://zfsonlinux.org/ to determine is zfs is supported by
 394 your distribution.
 395                                 ])
 396                         ], [
 397                                 AC_MSG_WARN([
 398
 399 Disabling optional zfs osd due to missing development headers.
 400
 401 Support for zfs can be enabled by downloading the required packages for your
 402 distribution.  See http://zfsonlinux.org/ to determine is zfs is supported by
 403 your distribution.
 404                                 ])
 405                         ])
 406                 ])
 407         ])
 408
 409         AS_IF([test "x$enable_zfs" = xyes], [
 410                 LB_CHECK_COMPILE([if zfs defines dsl_pool_config_enter/exit],
 411                 dsl_pool_config_enter, [
 412                         #include <sys/dsl_pool.h>
 413                 ],[
 414                         dsl_pool_config_enter(NULL, FTAG);
 415                 ],[
 416                         AC_DEFINE(HAVE_DSL_POOL_CONFIG, 1,
 417                                 [Have dsl_pool_config_enter/exit in ZFS])
 418                 ])
 419                 LB_CHECK_COMPILE([if zfs defines dsl_sync_task_do_nowait],
 420                 dsl_sync_task_do_nowait, [
 421                         #include <sys/dsl_synctask.h>
 422                 ],[
 423                         dsl_sync_task_do_nowait(NULL, NULL, NULL, NULL, NULL, 0, NULL);
 424                 ],[
 425                         AC_DEFINE(HAVE_DSL_SYNC_TASK_DO_NOWAIT, 1,
 426                                 [Have dsl_sync_task_do_nowait in ZFS])
 427                 ])
 428                 LB_CHECK_COMPILE([if zfs defines sa_spill_alloc],
 429                 sa_spill_alloc, [
 430                         #include <sys/kmem.h>
 431                         #include <sys/sa.h>
 432                 ],[
 433                         void *ptr;
 434
 435                         ptr = sa_spill_alloc(KM_SLEEP);
 436                         sa_spill_free(ptr);
 437                 ],[
 438                         AC_DEFINE(HAVE_SA_SPILL_ALLOC, 1,
 439                                 [Have sa_spill_alloc in ZFS])
 440                 ])
 441                 LB_CHECK_COMPILE([if zfs defines spa_maxblocksize],
 442                 spa_maxblocksize, [
 443                         #include <sys/spa.h>
 444                 ],[
 445                         spa_t *spa = NULL;
 446                         int size;
 447
 448                         size = spa_maxblocksize(spa);
 449                 ],[
 450                         AC_DEFINE(HAVE_SPA_MAXBLOCKSIZE, 1,
 451                                 [Have spa_maxblocksize in ZFS])
 452                 ])
 453
 454                 dnl #
 455                 dnl # ZFS 0.7.x adds support for large dnodes.  This
 456                 dnl # allows Lustre to optionally specify the size of a
 457                 dnl # dnode which ZFS will then use to store metadata such
 458                 dnl # as xattrs. The default dnode size specified by the
 459                 dnl # 'dnodesize' dataset property will be used unless a
 460                 dnl # specific value is provided.
 461                 dnl #
 462                 LB_CHECK_COMPILE([if zfs defines dmu_object_alloc_dnsize],
 463                 dmu_object_alloc_dnsize, [
 464                         #include <sys/dmu.h>
 465                         #include <sys/dnode.h>
 466                 ],[
 467                         objset_t *os = NULL;
 468                         dmu_object_type_t objtype = DMU_OT_NONE;
 469                         int blocksize = 0;
 470                         dmu_object_type_t bonustype = DMU_OT_SA;
 471                         int dnodesize = DNODE_MIN_SIZE;
 472                         dmu_tx_t *tx = NULL;
 473                         uint64_t id;
 474
 475                         id = dmu_object_alloc_dnsize(os, objtype, blocksize,
 476                                                      bonustype,
 477                                                      DN_BONUS_SIZE(dnodesize),
 478                                                      dnodesize, tx);
 479                 ],[
 480                         AC_DEFINE(HAVE_DMU_OBJECT_ALLOC_DNSIZE, 1,
 481                                 [Have dmu_object_alloc_dnsize in ZFS])
 482                 ])
 483
 484                 dnl #
 485                 dnl # ZFS 0.7.x extended dmu_prefetch() to take an additional
 486                 dnl # 'level' and 'priority' argument.  Use a level of 0 and a
 487                 dnl # priority of ZIO_PRIORITY_SYNC_READ to replicate the
 488                 dnl # behavior of the four argument version.
 489                 dnl #
 490                 LB_CHECK_COMPILE([if ZFS has 'dmu_prefetch' with 6 args],
 491                 dmu_prefetch, [
 492                         #include <sys/dmu.h>
 493                 ],[
 494                         objset_t *os = NULL;
 495                         uint64_t object = 0;
 496                         int64_t level = 0;
 497                         uint64_t offset = 0;
 498                         uint64_t len = 0;
 499                         enum zio_priority pri = ZIO_PRIORITY_SYNC_READ;
 500
 501                         dmu_prefetch(os, object, level, offset, len, pri);
 502                 ],[
 503                         AC_DEFINE(HAVE_DMU_PREFETCH_6ARG, 1,
 504                                 [Have 6 argument dmu_pretch in ZFS])
 505                 ])
 506                 dnl #
 507                 dnl # ZFS 0.7.0 feature: SPA_FEATURE_USEROBJ_ACCOUNTING
 508                 dnl #
 509                 LB_CHECK_COMPILE([if zfs has native dnode accounting supported],
 510                 dmu_objset_userobjspace_upgrade, [
 511                         #include <sys/dmu_objset.h>
 512                 ],[
 513                         dmu_objset_userobjspace_upgrade(NULL);
 514                 ],[
 515                         AC_DEFINE(HAVE_DMU_USEROBJ_ACCOUNTING, 1,
 516                                 [Have native dnode accounting in ZFS])
 517                 ])
 518         ])
 519
 520         AM_CONDITIONAL(ZFS_ENABLED, [test "x$enable_zfs" = xyes])
 521 ])