config/spl-build.m4

   1 ###############################################################################
   2 # Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
   3 # Copyright (C) 2007 The Regents of the University of California.
   4 # Written by Brian Behlendorf <behlendorf1@llnl.gov>.
   5 ###############################################################################
   6 # SPL_AC_CONFIG_KERNEL: Default SPL kernel configuration.
   7 ###############################################################################
   8
   9 AC_DEFUN([SPL_AC_CONFIG_KERNEL], [
  10         SPL_AC_KERNEL
  11
  12         if test "${LINUX_OBJ}" != "${LINUX}"; then
  13                 KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
  14         fi
  15         AC_SUBST(KERNELMAKE_PARAMS)
  16
  17         KERNELCPPFLAGS="$KERNELCPPFLAGS -Wstrict-prototypes"
  18         AC_SUBST(KERNELCPPFLAGS)
  19
  20         SPL_AC_DEBUG
  21         SPL_AC_DEBUG_KMEM
  22         SPL_AC_DEBUG_KMEM_TRACKING
  23         SPL_AC_TEST_MODULE
  24         SPL_AC_ATOMIC_SPINLOCK
  25         SPL_AC_SHRINKER_CALLBACK
  26         SPL_AC_CTL_NAME
  27         SPL_AC_PDE_DATA
  28         SPL_AC_SET_FS_PWD_WITH_CONST
  29         SPL_AC_2ARGS_VFS_UNLINK
  30         SPL_AC_4ARGS_VFS_RENAME
  31         SPL_AC_2ARGS_VFS_FSYNC
  32         SPL_AC_INODE_TRUNCATE_RANGE
  33         SPL_AC_FS_STRUCT_SPINLOCK
  34         SPL_AC_KUIDGID_T
  35         SPL_AC_PUT_TASK_STRUCT
  36         SPL_AC_EXPORTED_RWSEM_IS_LOCKED
  37         SPL_AC_KERNEL_FALLOCATE
  38         SPL_AC_CONFIG_ZLIB_INFLATE
  39         SPL_AC_CONFIG_ZLIB_DEFLATE
  40         SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
  41         SPL_AC_SHRINK_CONTROL_STRUCT
  42         SPL_AC_RWSEM_SPINLOCK_IS_RAW
  43         SPL_AC_SCHED_RT_HEADER
  44         SPL_AC_2ARGS_VFS_GETATTR
  45         SPL_AC_USLEEP_RANGE
  46         SPL_AC_KMEM_CACHE_ALLOCFLAGS
  47         SPL_AC_WAIT_ON_BIT
  48 ])
  49
  50 AC_DEFUN([SPL_AC_MODULE_SYMVERS], [
  51         modpost=$LINUX/scripts/Makefile.modpost
  52         AC_MSG_CHECKING([kernel file name for module symbols])
  53         if test "x$enable_linux_builtin" != xyes -a -f "$modpost"; then
  54                 if grep -q Modules.symvers $modpost; then
  55                         LINUX_SYMBOLS=Modules.symvers
  56                 else
  57                         LINUX_SYMBOLS=Module.symvers
  58                 fi
  59
  60                 if ! test -f "$LINUX_OBJ/$LINUX_SYMBOLS"; then
  61                         AC_MSG_ERROR([
  62         *** Please make sure the kernel devel package for your distribution
  63         *** is installed.  If you are building with a custom kernel, make sure the
  64         *** kernel is configured, built, and the '--with-linux=PATH' configure
  65         *** option refers to the location of the kernel source.])
  66                 fi
  67         else
  68                 LINUX_SYMBOLS=NONE
  69         fi
  70         AC_MSG_RESULT($LINUX_SYMBOLS)
  71         AC_SUBST(LINUX_SYMBOLS)
  72 ])
  73
  74 AC_DEFUN([SPL_AC_KERNEL], [
  75         AC_ARG_WITH([linux],
  76                 AS_HELP_STRING([--with-linux=PATH],
  77                 [Path to kernel source]),
  78                 [kernelsrc="$withval"])
  79
  80         AC_ARG_WITH([linux-obj],
  81                 AS_HELP_STRING([--with-linux-obj=PATH],
  82                 [Path to kernel build objects]),
  83                 [kernelbuild="$withval"])
  84
  85         AC_MSG_CHECKING([kernel source directory])
  86         if test -z "$kernelsrc"; then
  87                 if test -e "/lib/modules/$(uname -r)/source"; then
  88                         headersdir="/lib/modules/$(uname -r)/source"
  89                         sourcelink=$(readlink -f "$headersdir")
  90                 elif test -e "/lib/modules/$(uname -r)/build"; then
  91                         headersdir="/lib/modules/$(uname -r)/build"
  92                         sourcelink=$(readlink -f "$headersdir")
  93                 else
  94                         sourcelink=$(ls -1d /usr/src/kernels/* \
  95                                      /usr/src/linux-* \
  96                                      2>/dev/null | grep -v obj | tail -1)
  97                 fi
  98
  99                 if test -n "$sourcelink" && test -e ${sourcelink}; then
 100                         kernelsrc=`readlink -f ${sourcelink}`
 101                 else
 102                         kernelsrc="[Not found]"
 103                 fi
 104         else
 105                 if test "$kernelsrc" = "NONE"; then
 106                         kernsrcver=NONE
 107                 fi
 108         fi
 109
 110         AC_MSG_RESULT([$kernelsrc])
 111         if test ! -d "$kernelsrc"; then
 112                 AC_MSG_ERROR([
 113         *** Please make sure the kernel devel package for your distribution
 114         *** is installed and then try again.  If that fails, you can specify the
 115         *** location of the kernel source with the '--with-linux=PATH' option.])
 116         fi
 117
 118         AC_MSG_CHECKING([kernel build directory])
 119         if test -z "$kernelbuild"; then
 120                 if test -e "/lib/modules/$(uname -r)/build"; then
 121                         kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
 122                 elif test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
 123                         kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
 124                 elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
 125                         kernelbuild=${kernelsrc}-obj/${target_cpu}/default
 126                 elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
 127                         kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
 128                 else
 129                         kernelbuild=${kernelsrc}
 130                 fi
 131         fi
 132         AC_MSG_RESULT([$kernelbuild])
 133
 134         AC_MSG_CHECKING([kernel source version])
 135         utsrelease1=$kernelbuild/include/linux/version.h
 136         utsrelease2=$kernelbuild/include/linux/utsrelease.h
 137         utsrelease3=$kernelbuild/include/generated/utsrelease.h
 138         if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
 139                 utsrelease=linux/version.h
 140         elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
 141                 utsrelease=linux/utsrelease.h
 142         elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
 143                 utsrelease=generated/utsrelease.h
 144         fi
 145
 146         if test "$utsrelease"; then
 147                 kernsrcver=`(echo "#include <$utsrelease>";
 148                              echo "kernsrcver=UTS_RELEASE") |
 149                              cpp -I $kernelbuild/include |
 150                              grep "^kernsrcver=" | cut -d \" -f 2`
 151
 152                 if test -z "$kernsrcver"; then
 153                         AC_MSG_RESULT([Not found])
 154                         AC_MSG_ERROR([*** Cannot determine kernel version.])
 155                 fi
 156         else
 157                 AC_MSG_RESULT([Not found])
 158                 if test "x$enable_linux_builtin" != xyes; then
 159                         AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
 160                 else
 161                         AC_MSG_ERROR([
 162         *** Cannot find UTS_RELEASE definition.
 163         *** Please run 'make prepare' inside the kernel source tree.])
 164                 fi
 165         fi
 166
 167         AC_MSG_RESULT([$kernsrcver])
 168
 169         LINUX=${kernelsrc}
 170         LINUX_OBJ=${kernelbuild}
 171         LINUX_VERSION=${kernsrcver}
 172
 173         AC_SUBST(LINUX)
 174         AC_SUBST(LINUX_OBJ)
 175         AC_SUBST(LINUX_VERSION)
 176
 177         SPL_AC_MODULE_SYMVERS
 178 ])
 179
 180 dnl #
 181 dnl # Default SPL user configuration
 182 dnl #
 183 AC_DEFUN([SPL_AC_CONFIG_USER], [])
 184
 185 dnl #
 186 dnl # Check for rpm+rpmbuild to build RPM packages.  If these tools
 187 dnl # are missing, it is non-fatal, but you will not be able to build
 188 dnl # RPM packages and will be warned if you try too.
 189 dnl #
 190 dnl # By default, the generic spec file will be used because it requires
 191 dnl # minimal dependencies.  Distribution specific spec files can be
 192 dnl # placed under the 'rpm/<distribution>' directory and enabled using
 193 dnl # the --with-spec=<distribution> configure option.
 194 dnl #
 195 AC_DEFUN([SPL_AC_RPM], [
 196         RPM=rpm
 197         RPMBUILD=rpmbuild
 198
 199         AC_MSG_CHECKING([whether $RPM is available])
 200         AS_IF([tmp=$($RPM --version 2>/dev/null)], [
 201                 RPM_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
 202                 HAVE_RPM=yes
 203                 AC_MSG_RESULT([$HAVE_RPM ($RPM_VERSION)])
 204         ],[
 205                 HAVE_RPM=no
 206                 AC_MSG_RESULT([$HAVE_RPM])
 207         ])
 208
 209         AC_MSG_CHECKING([whether $RPMBUILD is available])
 210         AS_IF([tmp=$($RPMBUILD --version 2>/dev/null)], [
 211                 RPMBUILD_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
 212                 HAVE_RPMBUILD=yes
 213                 AC_MSG_RESULT([$HAVE_RPMBUILD ($RPMBUILD_VERSION)])
 214         ],[
 215                 HAVE_RPMBUILD=no
 216                 AC_MSG_RESULT([$HAVE_RPMBUILD])
 217         ])
 218
 219         RPM_DEFINE_COMMON='--define "$(DEBUG_SPL) 1" --define "$(DEBUG_KMEM) 1" --define "$(DEBUG_KMEM_TRACKING) 1"'
 220         RPM_DEFINE_UTIL=
 221         RPM_DEFINE_KMOD='--define "kernels $(LINUX_VERSION)"'
 222         RPM_DEFINE_DKMS=
 223
 224         SRPM_DEFINE_COMMON='--define "build_src_rpm 1"'
 225         SRPM_DEFINE_UTIL=
 226         SRPM_DEFINE_KMOD=
 227         SRPM_DEFINE_DKMS=
 228
 229         RPM_SPEC_DIR="rpm/generic"
 230         AC_ARG_WITH([spec],
 231                 AS_HELP_STRING([--with-spec=SPEC],
 232                 [Spec files 'generic']),
 233                 [RPM_SPEC_DIR="rpm/$withval"])
 234
 235         AC_MSG_CHECKING([whether spec files are available])
 236         AC_MSG_RESULT([yes ($RPM_SPEC_DIR/*.spec.in)])
 237
 238         AC_SUBST(HAVE_RPM)
 239         AC_SUBST(RPM)
 240         AC_SUBST(RPM_VERSION)
 241
 242         AC_SUBST(HAVE_RPMBUILD)
 243         AC_SUBST(RPMBUILD)
 244         AC_SUBST(RPMBUILD_VERSION)
 245
 246         AC_SUBST(RPM_SPEC_DIR)
 247         AC_SUBST(RPM_DEFINE_UTIL)
 248         AC_SUBST(RPM_DEFINE_KMOD)
 249         AC_SUBST(RPM_DEFINE_DKMS)
 250         AC_SUBST(RPM_DEFINE_COMMON)
 251         AC_SUBST(SRPM_DEFINE_UTIL)
 252         AC_SUBST(SRPM_DEFINE_KMOD)
 253         AC_SUBST(SRPM_DEFINE_DKMS)
 254         AC_SUBST(SRPM_DEFINE_COMMON)
 255 ])
 256
 257 dnl #
 258 dnl # Check for dpkg+dpkg-buildpackage to build DEB packages.  If these
 259 dnl # tools are missing it is non-fatal but you will not be able to build
 260 dnl # DEB packages and will be warned if you try too.
 261 dnl #
 262 AC_DEFUN([SPL_AC_DPKG], [
 263         DPKG=dpkg
 264         DPKGBUILD=dpkg-buildpackage
 265
 266         AC_MSG_CHECKING([whether $DPKG is available])
 267         AS_IF([tmp=$($DPKG --version 2>/dev/null)], [
 268                 DPKG_VERSION=$(echo $tmp | $AWK '/Debian/ { print $[7] }')
 269                 HAVE_DPKG=yes
 270                 AC_MSG_RESULT([$HAVE_DPKG ($DPKG_VERSION)])
 271         ],[
 272                 HAVE_DPKG=no
 273                 AC_MSG_RESULT([$HAVE_DPKG])
 274         ])
 275
 276         AC_MSG_CHECKING([whether $DPKGBUILD is available])
 277         AS_IF([tmp=$($DPKGBUILD --version 2>/dev/null)], [
 278                 DPKGBUILD_VERSION=$(echo $tmp | \
 279                     $AWK '/Debian/ { print $[4] }' | cut -f-4 -d'.')
 280                 HAVE_DPKGBUILD=yes
 281                 AC_MSG_RESULT([$HAVE_DPKGBUILD ($DPKGBUILD_VERSION)])
 282         ],[
 283                 HAVE_DPKGBUILD=no
 284                 AC_MSG_RESULT([$HAVE_DPKGBUILD])
 285         ])
 286
 287         AC_SUBST(HAVE_DPKG)
 288         AC_SUBST(DPKG)
 289         AC_SUBST(DPKG_VERSION)
 290
 291         AC_SUBST(HAVE_DPKGBUILD)
 292         AC_SUBST(DPKGBUILD)
 293         AC_SUBST(DPKGBUILD_VERSION)
 294 ])
 295
 296 dnl #
 297 dnl # Until native packaging for various different packing systems
 298 dnl # can be added the least we can do is attempt to use alien to
 299 dnl # convert the RPM packages to the needed package type.  This is
 300 dnl # a hack but so far it has worked reasonable well.
 301 dnl #
 302 AC_DEFUN([SPL_AC_ALIEN], [
 303         ALIEN=alien
 304
 305         AC_MSG_CHECKING([whether $ALIEN is available])
 306         AS_IF([tmp=$($ALIEN --version 2>/dev/null)], [
 307                 ALIEN_VERSION=$(echo $tmp | $AWK '{ print $[3] }')
 308                 HAVE_ALIEN=yes
 309                 AC_MSG_RESULT([$HAVE_ALIEN ($ALIEN_VERSION)])
 310         ],[
 311                 HAVE_ALIEN=no
 312                 AC_MSG_RESULT([$HAVE_ALIEN])
 313         ])
 314
 315         AC_SUBST(HAVE_ALIEN)
 316         AC_SUBST(ALIEN)
 317         AC_SUBST(ALIEN_VERSION)
 318 ])
 319
 320 dnl #
 321 dnl # Using the VENDOR tag from config.guess set the default
 322 dnl # package type for 'make pkg': (rpm | deb | tgz)
 323 dnl #
 324 AC_DEFUN([SPL_AC_DEFAULT_PACKAGE], [
 325         AC_MSG_CHECKING([linux distribution])
 326         if test -f /etc/toss-release ; then
 327                 VENDOR=toss ;
 328         elif test -f /etc/fedora-release ; then
 329                 VENDOR=fedora ;
 330         elif test -f /etc/redhat-release ; then
 331                 VENDOR=redhat ;
 332         elif test -f /etc/gentoo-release ; then
 333                 VENDOR=gentoo ;
 334         elif test -f /etc/arch-release ; then
 335                 VENDOR=arch ;
 336         elif test -f /etc/SuSE-release ; then
 337                 VENDOR=sles ;
 338         elif test -f /etc/slackware-version ; then
 339                 VENDOR=slackware ;
 340         elif test -f /etc/lunar.release ; then
 341                 VENDOR=lunar ;
 342         elif test -f /etc/lsb-release ; then
 343                 VENDOR=ubuntu ;
 344         elif test -f /etc/debian_version ; then
 345                 VENDOR=debian ;
 346         else
 347                 VENDOR= ;
 348         fi
 349         AC_MSG_RESULT([$VENDOR])
 350         AC_SUBST(VENDOR)
 351
 352         AC_MSG_CHECKING([default package type])
 353         case "$VENDOR" in
 354                 toss)       DEFAULT_PACKAGE=rpm  ;;
 355                 redhat)     DEFAULT_PACKAGE=rpm  ;;
 356                 fedora)     DEFAULT_PACKAGE=rpm  ;;
 357                 gentoo)     DEFAULT_PACKAGE=tgz  ;;
 358                 arch)       DEFAULT_PACKAGE=tgz  ;;
 359                 sles)       DEFAULT_PACKAGE=rpm  ;;
 360                 slackware)  DEFAULT_PACKAGE=tgz  ;;
 361                 lunar)      DEFAULT_PACKAGE=tgz  ;;
 362                 ubuntu)     DEFAULT_PACKAGE=deb  ;;
 363                 debian)     DEFAULT_PACKAGE=deb  ;;
 364                 *)          DEFAULT_PACKAGE=rpm  ;;
 365         esac
 366
 367         AC_MSG_RESULT([$DEFAULT_PACKAGE])
 368         AC_SUBST(DEFAULT_PACKAGE)
 369 ])
 370
 371 dnl #
 372 dnl # Default SPL user configuration
 373 dnl #
 374 AC_DEFUN([SPL_AC_PACKAGE], [
 375         SPL_AC_DEFAULT_PACKAGE
 376         SPL_AC_RPM
 377         SPL_AC_DPKG
 378         SPL_AC_ALIEN
 379 ])
 380
 381 AC_DEFUN([SPL_AC_LICENSE], [
 382         AC_MSG_CHECKING([spl author])
 383         AC_MSG_RESULT([$SPL_META_AUTHOR])
 384
 385         AC_MSG_CHECKING([spl license])
 386         AC_MSG_RESULT([$SPL_META_LICENSE])
 387 ])
 388
 389 AC_DEFUN([SPL_AC_CONFIG], [
 390         SPL_CONFIG=all
 391         AC_ARG_WITH([config],
 392                 AS_HELP_STRING([--with-config=CONFIG],
 393                 [Config file 'kernel|user|all|srpm']),
 394                 [SPL_CONFIG="$withval"])
 395         AC_ARG_ENABLE([linux-builtin],
 396                 [AC_HELP_STRING([--enable-linux-builtin],
 397                 [Configure for builtin in-tree kernel modules @<:@default=no@:>@])],
 398                 [],
 399                 [enable_linux_builtin=no])
 400
 401         AC_MSG_CHECKING([spl config])
 402         AC_MSG_RESULT([$SPL_CONFIG]);
 403         AC_SUBST(SPL_CONFIG)
 404
 405         case "$SPL_CONFIG" in
 406                 kernel) SPL_AC_CONFIG_KERNEL ;;
 407                 user)   SPL_AC_CONFIG_USER   ;;
 408                 all)    SPL_AC_CONFIG_KERNEL
 409                         SPL_AC_CONFIG_USER   ;;
 410                 srpm)                        ;;
 411                 *)
 412                 AC_MSG_RESULT([Error!])
 413                 AC_MSG_ERROR([Bad value "$SPL_CONFIG" for --with-config,
 414                              user kernel|user|all|srpm]) ;;
 415         esac
 416
 417         AM_CONDITIONAL([CONFIG_USER],
 418                        [test "$SPL_CONFIG" = user -o "$SPL_CONFIG" = all])
 419         AM_CONDITIONAL([CONFIG_KERNEL],
 420                        [test "$SPL_CONFIG" = kernel -o "$SPL_CONFIG" = all] &&
 421                        [test "x$enable_linux_builtin" != xyes ])
 422 ])
 423
 424 dnl #
 425 dnl # Enable if the SPL should be compiled with internal debugging enabled.
 426 dnl # By default this support is disabled.
 427 dnl #
 428 AC_DEFUN([SPL_AC_DEBUG], [
 429         AC_MSG_CHECKING([whether debugging is enabled])
 430         AC_ARG_ENABLE([debug],
 431                 [AS_HELP_STRING([--enable-debug],
 432                 [Enable generic debug support @<:@default=no@:>@])],
 433                 [],
 434                 [enable_debug=no])
 435
 436         AS_IF([test "x$enable_debug" = xyes],
 437         [
 438                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG -Werror"
 439                 DEBUG_CFLAGS="-DDEBUG -Werror"
 440                 DEBUG_SPL="_with_debug"
 441         ], [
 442                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DNDEBUG"
 443                 DEBUG_CFLAGS="-DNDEBUG"
 444                 DEBUG_SPL="_without_debug"
 445         ])
 446
 447         AC_SUBST(DEBUG_CFLAGS)
 448         AC_SUBST(DEBUG_SPL)
 449         AC_MSG_RESULT([$enable_debug])
 450 ])
 451
 452 dnl #
 453 dnl # Enabled by default it provides a minimal level of memory tracking.
 454 dnl # A total count of bytes allocated is kept for each alloc and free.
 455 dnl # Then at module unload time a report to the console will be printed
 456 dnl # if memory was leaked.  Additionally, /proc/spl/kmem/slab will exist
 457 dnl # and provide an easy way to inspect the kmem based slab.
 458 dnl #
 459 AC_DEFUN([SPL_AC_DEBUG_KMEM], [
 460         AC_ARG_ENABLE([debug-kmem],
 461                 [AS_HELP_STRING([--enable-debug-kmem],
 462                 [Enable basic kmem accounting @<:@default=yes@:>@])],
 463                 [],
 464                 [enable_debug_kmem=yes])
 465
 466         AS_IF([test "x$enable_debug_kmem" = xyes],
 467         [
 468                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM"
 469                 DEBUG_KMEM="_with_debug_kmem"
 470                 AC_DEFINE([DEBUG_KMEM], [1],
 471                 [Define to 1 to enable basic kmem accounting])
 472         ], [
 473                 DEBUG_KMEM="_without_debug_kmem"
 474         ])
 475
 476         AC_SUBST(DEBUG_KMEM)
 477         AC_MSG_CHECKING([whether basic kmem accounting is enabled])
 478         AC_MSG_RESULT([$enable_debug_kmem])
 479 ])
 480
 481 dnl #
 482 dnl # Disabled by default it provides detailed memory tracking.  This
 483 dnl # feature also requires --enable-debug-kmem to be set.  When enabled
 484 dnl # not only will total bytes be tracked but also the location of every
 485 dnl # alloc and free.  When the SPL module is unloaded a list of all leaked
 486 dnl # addresses and where they were allocated will be dumped to the console.
 487 dnl # Enabling this feature has a significant impact on performance but it
 488 dnl # makes finding memory leaks pretty straight forward.
 489 dnl #
 490 AC_DEFUN([SPL_AC_DEBUG_KMEM_TRACKING], [
 491         AC_ARG_ENABLE([debug-kmem-tracking],
 492                 [AS_HELP_STRING([--enable-debug-kmem-tracking],
 493                 [Enable detailed kmem tracking  @<:@default=no@:>@])],
 494                 [],
 495                 [enable_debug_kmem_tracking=no])
 496
 497         AS_IF([test "x$enable_debug_kmem_tracking" = xyes],
 498         [
 499                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM_TRACKING"
 500                 DEBUG_KMEM_TRACKING="_with_debug_kmem_tracking"
 501                 AC_DEFINE([DEBUG_KMEM_TRACKING], [1],
 502                 [Define to 1 to enable detailed kmem tracking])
 503         ], [
 504                 DEBUG_KMEM_TRACKING="_without_debug_kmem_tracking"
 505         ])
 506
 507         AC_SUBST(DEBUG_KMEM_TRACKING)
 508         AC_MSG_CHECKING([whether detailed kmem tracking is enabled])
 509         AC_MSG_RESULT([$enable_debug_kmem_tracking])
 510 ])
 511
 512 dnl #
 513 dnl # SPL_LINUX_CONFTEST
 514 dnl #
 515 AC_DEFUN([SPL_LINUX_CONFTEST], [
 516 cat confdefs.h - <<_ACEOF >conftest.c
 517 $1
 518 _ACEOF
 519 ])
 520
 521 dnl #
 522 dnl # SPL_LANG_PROGRAM(C)([PROLOGUE], [BODY])
 523 dnl #
 524 m4_define([SPL_LANG_PROGRAM], [
 525 $1
 526 int
 527 main (void)
 528 {
 529 dnl Do *not* indent the following line: there may be CPP directives.
 530 dnl Don't move the `;' right after for the same reason.
 531 $2
 532   ;
 533   return 0;
 534 }
 535 ])
 536
 537 dnl #
 538 dnl # SPL_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
 539 dnl #
 540 AC_DEFUN([SPL_LINUX_COMPILE_IFELSE], [
 541         m4_ifvaln([$1], [SPL_LINUX_CONFTEST([$1])])
 542         rm -Rf build && mkdir -p build && touch build/conftest.mod.c
 543         echo "obj-m := conftest.o" >build/Makefile
 544         modpost_flag=''
 545         test "x$enable_linux_builtin" = xyes && modpost_flag='modpost=true' # fake modpost stage
 546         AS_IF(
 547                 [AC_TRY_COMMAND(cp conftest.c build && make [$2] -C $LINUX_OBJ EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM M=$PWD/build $modpost_flag) >/dev/null && AC_TRY_COMMAND([$3])],
 548                 [$4],
 549                 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
 550         )
 551         rm -Rf build
 552 ])
 553
 554 dnl #
 555 dnl # SPL_LINUX_TRY_COMPILE like AC_TRY_COMPILE
 556 dnl #
 557 AC_DEFUN([SPL_LINUX_TRY_COMPILE],
 558         [SPL_LINUX_COMPILE_IFELSE(
 559         [AC_LANG_SOURCE([SPL_LANG_PROGRAM([[$1]], [[$2]])])],
 560         [modules],
 561         [test -s build/conftest.o],
 562         [$3], [$4])
 563 ])
 564
 565 dnl #
 566 dnl # SPL_CHECK_SYMBOL_EXPORT
 567 dnl # check symbol exported or not
 568 dnl #
 569 AC_DEFUN([SPL_CHECK_SYMBOL_EXPORT], [
 570         grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
 571                 $LINUX_OBJ/Module*.symvers 2>/dev/null
 572         rc=$?
 573         if test $rc -ne 0; then
 574                 export=0
 575                 for file in $2; do
 576                         grep -q -E "EXPORT_SYMBOL.*($1)" \
 577                                 "$LINUX_OBJ/$file" 2>/dev/null
 578                         rc=$?
 579                         if test $rc -eq 0; then
 580                                 export=1
 581                                 break;
 582                         fi
 583                 done
 584                 if test $export -eq 0; then :
 585                         $4
 586                 else :
 587                         $3
 588                 fi
 589         else :
 590                 $3
 591         fi
 592 ])
 593
 594 dnl #
 595 dnl # SPL_LINUX_TRY_COMPILE_SYMBOL
 596 dnl # like SPL_LINUX_TRY_COMPILE, except SPL_CHECK_SYMBOL_EXPORT
 597 dnl # is called if not compiling for builtin
 598 dnl #
 599 AC_DEFUN([SPL_LINUX_TRY_COMPILE_SYMBOL], [
 600         SPL_LINUX_TRY_COMPILE([$1], [$2], [rc=0], [rc=1])
 601         if test $rc -ne 0; then :
 602                 $6
 603         else
 604                 if test "x$enable_linux_builtin" != xyes; then
 605                         SPL_CHECK_SYMBOL_EXPORT([$3], [$4], [rc=0], [rc=1])
 606                 fi
 607                 if test $rc -ne 0; then :
 608                         $6
 609                 else :
 610                         $5
 611                 fi
 612         fi
 613 ])
 614
 615 dnl #
 616 dnl # SPL_CHECK_SYMBOL_HEADER
 617 dnl # check if a symbol prototype is defined in listed headers.
 618 dnl #
 619 AC_DEFUN([SPL_CHECK_SYMBOL_HEADER], [
 620         AC_MSG_CHECKING([whether symbol $1 exists in header])
 621         header=0
 622         for file in $3; do
 623                 grep -q "$2" "$LINUX/$file" 2>/dev/null
 624                 rc=$?
 625                 if test $rc -eq 0; then
 626                         header=1
 627                         break;
 628                 fi
 629         done
 630         if test $header -eq 0; then
 631                 AC_MSG_RESULT([no])
 632                 $5
 633         else
 634                 AC_MSG_RESULT([yes])
 635                 $4
 636         fi
 637 ])
 638
 639 dnl #
 640 dnl # SPL_CHECK_HEADER
 641 dnl # check whether header exists and define HAVE_$2_HEADER
 642 dnl #
 643 AC_DEFUN([SPL_CHECK_HEADER],
 644         [AC_MSG_CHECKING([whether header $1 exists])
 645         SPL_LINUX_TRY_COMPILE([
 646                 #include <$1>
 647         ],[
 648                 return 0;
 649         ],[
 650                 AC_DEFINE(HAVE_$2_HEADER, 1, [$1 exists])
 651                 AC_MSG_RESULT(yes)
 652                 $3
 653         ],[
 654                 AC_MSG_RESULT(no)
 655                 $4
 656         ])
 657 ])
 658
 659 dnl #
 660 dnl # Basic toolchain sanity check.  Verify that kernel modules can
 661 dnl # be built and which symbols can be used.
 662 dnl #
 663 AC_DEFUN([SPL_AC_TEST_MODULE],
 664         [AC_MSG_CHECKING([whether modules can be built])
 665         SPL_LINUX_TRY_COMPILE([],[],[
 666                 AC_MSG_RESULT([yes])
 667         ],[
 668                 AC_MSG_RESULT([no])
 669                 if test "x$enable_linux_builtin" != xyes; then
 670                         AC_MSG_ERROR([*** Unable to build an empty module.])
 671                 else
 672                         AC_MSG_ERROR([
 673         *** Unable to build an empty module.
 674         *** Please run 'make scripts' inside the kernel source tree.])
 675                 fi
 676         ])
 677
 678         AC_RUN_IFELSE([
 679                 AC_LANG_PROGRAM([
 680                         #include "$LINUX/include/linux/license.h"
 681                 ], [
 682                         return !license_is_gpl_compatible("$SPL_META_LICENSE");
 683                 ])
 684         ], [
 685                 AC_DEFINE([SPL_IS_GPL_COMPATIBLE], [1],
 686                     [Define to 1 if GPL-only symbols can be used])
 687         ], [
 688         ])
 689 ])
 690
 691 dnl #
 692 dnl # Use the atomic implemenation based on global spinlocks.  This
 693 dnl # should only be needed by 32-bit kernels which do not provide
 694 dnl # the atomic64_* API.  It may be optionally enabled as a fallback
 695 dnl # if problems are observed with the direct mapping to the native
 696 dnl # Linux atomic operations.  You may not disable atomic spinlocks
 697 dnl # if you kernel does not an atomic64_* API.
 698 dnl #
 699 AC_DEFUN([SPL_AC_ATOMIC_SPINLOCK], [
 700         AC_ARG_ENABLE([atomic-spinlocks],
 701                 [AS_HELP_STRING([--enable-atomic-spinlocks],
 702                 [Atomic types use spinlocks @<:@default=check@:>@])],
 703                 [],
 704                 [enable_atomic_spinlocks=check])
 705
 706         SPL_LINUX_TRY_COMPILE([
 707                 #include <linux/fs.h>
 708         ],[
 709                 atomic64_t *ptr __attribute__ ((unused));
 710         ],[
 711                 have_atomic64_t=yes
 712                 AC_DEFINE(HAVE_ATOMIC64_T, 1,
 713                         [kernel defines atomic64_t])
 714         ],[
 715                 have_atomic64_t=no
 716         ])
 717
 718         AS_IF([test "x$enable_atomic_spinlocks" = xcheck], [
 719                 AS_IF([test "x$have_atomic64_t" = xyes], [
 720                         enable_atomic_spinlocks=no
 721                 ],[
 722                         enable_atomic_spinlocks=yes
 723                 ])
 724         ])
 725
 726         AS_IF([test "x$enable_atomic_spinlocks" = xyes], [
 727                 AC_DEFINE([ATOMIC_SPINLOCK], [1],
 728                         [Atomic types use spinlocks])
 729         ],[
 730                 AS_IF([test "x$have_atomic64_t" = xno], [
 731                         AC_MSG_FAILURE(
 732                         [--disable-atomic-spinlocks given but required atomic64 support is unavailable])
 733                 ])
 734         ])
 735
 736         AC_MSG_CHECKING([whether atomic types use spinlocks])
 737         AC_MSG_RESULT([$enable_atomic_spinlocks])
 738
 739         AC_MSG_CHECKING([whether kernel defines atomic64_t])
 740         AC_MSG_RESULT([$have_atomic64_t])
 741 ])
 742
 743 AC_DEFUN([SPL_AC_SHRINKER_CALLBACK],[
 744         tmp_flags="$EXTRA_KCFLAGS"
 745         EXTRA_KCFLAGS="-Werror"
 746         dnl #
 747         dnl # 2.6.23 to 2.6.34 API change
 748         dnl # ->shrink(int nr_to_scan, gfp_t gfp_mask)
 749         dnl #
 750         AC_MSG_CHECKING([whether old 2-argument shrinker exists])
 751         SPL_LINUX_TRY_COMPILE([
 752                 #include <linux/mm.h>
 753
 754                 int shrinker_cb(int nr_to_scan, gfp_t gfp_mask);
 755         ],[
 756                 struct shrinker cache_shrinker = {
 757                         .shrink = shrinker_cb,
 758                         .seeks = DEFAULT_SEEKS,
 759                 };
 760                 register_shrinker(&cache_shrinker);
 761         ],[
 762                 AC_MSG_RESULT(yes)
 763                 AC_DEFINE(HAVE_2ARGS_OLD_SHRINKER_CALLBACK, 1,
 764                         [old shrinker callback wants 2 args])
 765         ],[
 766                 AC_MSG_RESULT(no)
 767                 dnl #
 768                 dnl # 2.6.35 - 2.6.39 API change
 769                 dnl # ->shrink(struct shrinker *,
 770                 dnl #          int nr_to_scan, gfp_t gfp_mask)
 771                 dnl #
 772                 AC_MSG_CHECKING([whether old 3-argument shrinker exists])
 773                 SPL_LINUX_TRY_COMPILE([
 774                         #include <linux/mm.h>
 775
 776                         int shrinker_cb(struct shrinker *, int nr_to_scan,
 777                                         gfp_t gfp_mask);
 778                 ],[
 779                         struct shrinker cache_shrinker = {
 780                                 .shrink = shrinker_cb,
 781                                 .seeks = DEFAULT_SEEKS,
 782                         };
 783                         register_shrinker(&cache_shrinker);
 784                 ],[
 785                         AC_MSG_RESULT(yes)
 786                         AC_DEFINE(HAVE_3ARGS_SHRINKER_CALLBACK, 1,
 787                                 [old shrinker callback wants 3 args])
 788                 ],[
 789                         AC_MSG_RESULT(no)
 790                         dnl #
 791                         dnl # 3.0 - 3.11 API change
 792                         dnl # ->shrink(struct shrinker *,
 793                         dnl #          struct shrink_control *sc)
 794                         dnl #
 795                         AC_MSG_CHECKING(
 796                                 [whether new 2-argument shrinker exists])
 797                         SPL_LINUX_TRY_COMPILE([
 798                                 #include <linux/mm.h>
 799
 800                                 int shrinker_cb(struct shrinker *,
 801                                                 struct shrink_control *sc);
 802                         ],[
 803                                 struct shrinker cache_shrinker = {
 804                                         .shrink = shrinker_cb,
 805                                         .seeks = DEFAULT_SEEKS,
 806                                 };
 807                                 register_shrinker(&cache_shrinker);
 808                         ],[
 809                                 AC_MSG_RESULT(yes)
 810                                 AC_DEFINE(HAVE_2ARGS_NEW_SHRINKER_CALLBACK, 1,
 811                                         [new shrinker callback wants 2 args])
 812                         ],[
 813                                 AC_MSG_RESULT(no)
 814                                 dnl #
 815                                 dnl # 3.12 API change,
 816                                 dnl # ->shrink() is logically split in to
 817                                 dnl # ->count_objects() and ->scan_objects()
 818                                 dnl #
 819                                 AC_MSG_CHECKING(
 820                                     [whether ->count_objects callback exists])
 821                                 SPL_LINUX_TRY_COMPILE([
 822                                         #include <linux/mm.h>
 823
 824                                         unsigned long shrinker_cb(
 825                                                 struct shrinker *,
 826                                                 struct shrink_control *sc);
 827                                 ],[
 828                                         struct shrinker cache_shrinker = {
 829                                                 .count_objects = shrinker_cb,
 830                                                 .scan_objects = shrinker_cb,
 831                                                 .seeks = DEFAULT_SEEKS,
 832                                         };
 833                                         register_shrinker(&cache_shrinker);
 834                                 ],[
 835                                         AC_MSG_RESULT(yes)
 836                                         AC_DEFINE(HAVE_SPLIT_SHRINKER_CALLBACK,
 837                                                 1, [->count_objects exists])
 838                                 ],[
 839                                         AC_MSG_ERROR(error)
 840                                 ])
 841                         ])
 842                 ])
 843         ])
 844         EXTRA_KCFLAGS="$tmp_flags"
 845 ])
 846
 847 dnl #
 848 dnl # 2.6.33 API change,
 849 dnl # Removed .ctl_name from struct ctl_table.
 850 dnl #
 851 AC_DEFUN([SPL_AC_CTL_NAME], [
 852         AC_MSG_CHECKING([whether struct ctl_table has ctl_name])
 853         SPL_LINUX_TRY_COMPILE([
 854                 #include <linux/sysctl.h>
 855         ],[
 856                 struct ctl_table ctl __attribute__ ((unused));
 857                 ctl.ctl_name = 0;
 858         ],[
 859                 AC_MSG_RESULT(yes)
 860                 AC_DEFINE(HAVE_CTL_NAME, 1, [struct ctl_table has ctl_name])
 861         ],[
 862                 AC_MSG_RESULT(no)
 863         ])
 864 ])
 865
 866 dnl #
 867 dnl # 3.10 API change,
 868 dnl # PDE is replaced by PDE_DATA
 869 dnl #
 870 AC_DEFUN([SPL_AC_PDE_DATA], [
 871         AC_MSG_CHECKING([whether PDE_DATA() is available])
 872         SPL_LINUX_TRY_COMPILE_SYMBOL([
 873                 #include <linux/proc_fs.h>
 874         ], [
 875                 PDE_DATA(NULL);
 876         ], [PDE_DATA], [], [
 877                 AC_MSG_RESULT(yes)
 878                 AC_DEFINE(HAVE_PDE_DATA, 1, [yes])
 879         ],[
 880                 AC_MSG_RESULT(no)
 881         ])
 882 ])
 883
 884 dnl #
 885 dnl # 3.9 API change
 886 dnl # set_fs_pwd takes const struct path *
 887 dnl #
 888 AC_DEFUN([SPL_AC_SET_FS_PWD_WITH_CONST],
 889         tmp_flags="$EXTRA_KCFLAGS"
 890         EXTRA_KCFLAGS="-Werror"
 891         [AC_MSG_CHECKING([whether set_fs_pwd() requires const struct path *])
 892         SPL_LINUX_TRY_COMPILE([
 893                 #include <linux/spinlock.h>
 894                 #include <linux/fs_struct.h>
 895                 #include <linux/path.h>
 896                 void (*const set_fs_pwd_func)
 897                         (struct fs_struct *, const struct path *)
 898                         = set_fs_pwd;
 899         ],[
 900                 return 0;
 901         ],[
 902                 AC_MSG_RESULT(yes)
 903                 AC_DEFINE(HAVE_SET_FS_PWD_WITH_CONST, 1,
 904                         [set_fs_pwd() needs const path *])
 905         ],[
 906                 SPL_LINUX_TRY_COMPILE([
 907                         #include <linux/spinlock.h>
 908                         #include <linux/fs_struct.h>
 909                         #include <linux/path.h>
 910                         void (*const set_fs_pwd_func)
 911                                 (struct fs_struct *, struct path *)
 912                                 = set_fs_pwd;
 913                 ],[
 914                         return 0;
 915                 ],[
 916                         AC_MSG_RESULT(no)
 917                 ],[
 918                         AC_MSG_ERROR(unknown)
 919                 ])
 920         ])
 921         EXTRA_KCFLAGS="$tmp_flags"
 922 ])
 923
 924 dnl #
 925 dnl # 3.13 API change
 926 dnl # vfs_unlink() updated to take a third delegated_inode argument.
 927 dnl #
 928 AC_DEFUN([SPL_AC_2ARGS_VFS_UNLINK],
 929         [AC_MSG_CHECKING([whether vfs_unlink() wants 2 args])
 930         SPL_LINUX_TRY_COMPILE([
 931                 #include <linux/fs.h>
 932         ],[
 933                 vfs_unlink((struct inode *) NULL, (struct dentry *) NULL);
 934         ],[
 935                 AC_MSG_RESULT(yes)
 936                 AC_DEFINE(HAVE_2ARGS_VFS_UNLINK, 1,
 937                           [vfs_unlink() wants 2 args])
 938         ],[
 939                 AC_MSG_RESULT(no)
 940                 dnl #
 941                 dnl # Linux 3.13 API change
 942                 dnl # Added delegated inode
 943                 dnl #
 944                 AC_MSG_CHECKING([whether vfs_unlink() wants 3 args])
 945                 SPL_LINUX_TRY_COMPILE([
 946                         #include <linux/fs.h>
 947                 ],[
 948                         vfs_unlink((struct inode *) NULL,
 949                                 (struct dentry *) NULL,
 950                                 (struct inode **) NULL);
 951                 ],[
 952                         AC_MSG_RESULT(yes)
 953                         AC_DEFINE(HAVE_3ARGS_VFS_UNLINK, 1,
 954                                   [vfs_unlink() wants 3 args])
 955                 ],[
 956                         AC_MSG_ERROR(no)
 957                 ])
 958
 959         ])
 960 ])
 961
 962 dnl #
 963 dnl # 3.13 and 3.15 API changes
 964 dnl # Added delegated inode and flags argument.
 965 dnl #
 966 AC_DEFUN([SPL_AC_4ARGS_VFS_RENAME],
 967         [AC_MSG_CHECKING([whether vfs_rename() wants 4 args])
 968         SPL_LINUX_TRY_COMPILE([
 969                 #include <linux/fs.h>
 970         ],[
 971                 vfs_rename((struct inode *) NULL, (struct dentry *) NULL,
 972                         (struct inode *) NULL, (struct dentry *) NULL);
 973         ],[
 974                 AC_MSG_RESULT(yes)
 975                 AC_DEFINE(HAVE_4ARGS_VFS_RENAME, 1,
 976                           [vfs_rename() wants 4 args])
 977         ],[
 978                 AC_MSG_RESULT(no)
 979                 dnl #
 980                 dnl # Linux 3.13 API change
 981                 dnl # Added delegated inode
 982                 dnl #
 983                 AC_MSG_CHECKING([whether vfs_rename() wants 5 args])
 984                 SPL_LINUX_TRY_COMPILE([
 985                         #include <linux/fs.h>
 986                 ],[
 987                         vfs_rename((struct inode *) NULL,
 988                                 (struct dentry *) NULL,
 989                                 (struct inode *) NULL,
 990                                 (struct dentry *) NULL,
 991                                 (struct inode **) NULL);
 992                 ],[
 993                         AC_MSG_RESULT(yes)
 994                         AC_DEFINE(HAVE_5ARGS_VFS_RENAME, 1,
 995                                   [vfs_rename() wants 5 args])
 996                 ],[
 997                         AC_MSG_RESULT(no)
 998                         dnl #
 999                         dnl # Linux 3.15 API change
1000                         dnl # Added flags
1001                         dnl #
1002                         AC_MSG_CHECKING([whether vfs_rename() wants 6 args])
1003                         SPL_LINUX_TRY_COMPILE([
1004                                 #include <linux/fs.h>
1005                         ],[
1006                                 vfs_rename((struct inode *) NULL,
1007                                         (struct dentry *) NULL,
1008                                         (struct inode *) NULL,
1009                                         (struct dentry *) NULL,
1010                                         (struct inode **) NULL,
1011                                         (unsigned int) 0);
1012                         ],[
1013                                 AC_MSG_RESULT(yes)
1014                                 AC_DEFINE(HAVE_6ARGS_VFS_RENAME, 1,
1015                                           [vfs_rename() wants 6 args])
1016                         ],[
1017                                 AC_MSG_ERROR(no)
1018                         ])
1019                 ])
1020         ])
1021 ])
1022
1023 dnl #
1024 dnl # 2.6.36 API change,
1025 dnl # The 'struct fs_struct->lock' was changed from a rwlock_t to
1026 dnl # a spinlock_t to improve the fastpath performance.
1027 dnl #
1028 AC_DEFUN([SPL_AC_FS_STRUCT_SPINLOCK], [
1029         AC_MSG_CHECKING([whether struct fs_struct uses spinlock_t])
1030         tmp_flags="$EXTRA_KCFLAGS"
1031         EXTRA_KCFLAGS="-Werror"
1032         SPL_LINUX_TRY_COMPILE([
1033                 #include <linux/sched.h>
1034                 #include <linux/fs_struct.h>
1035         ],[
1036                 static struct fs_struct fs;
1037                 spin_lock_init(&fs.lock);
1038         ],[
1039                 AC_MSG_RESULT(yes)
1040                 AC_DEFINE(HAVE_FS_STRUCT_SPINLOCK, 1,
1041                           [struct fs_struct uses spinlock_t])
1042         ],[
1043                 AC_MSG_RESULT(no)
1044         ])
1045         EXTRA_KCFLAGS="$tmp_flags"
1046 ])
1047
1048 dnl #
1049 dnl # User namespaces, use kuid_t in place of uid_t
1050 dnl # where available. Not strictly a user namespaces thing
1051 dnl # but it should prevent surprises
1052 dnl #
1053 AC_DEFUN([SPL_AC_KUIDGID_T], [
1054         AC_MSG_CHECKING([whether kuid_t/kgid_t is available])
1055         SPL_LINUX_TRY_COMPILE([
1056                 #include <linux/uidgid.h>
1057         ], [
1058                 kuid_t userid = KUIDT_INIT(0);
1059                 kgid_t groupid = KGIDT_INIT(0);
1060         ],[
1061                 SPL_LINUX_TRY_COMPILE([
1062                         #include <linux/uidgid.h>
1063                 ], [
1064                         kuid_t userid = 0;
1065                         kgid_t groupid = 0;
1066                 ],[
1067                         AC_MSG_RESULT(yes; optional)
1068                 ],[
1069                         AC_MSG_RESULT(yes; mandatory)
1070                         AC_DEFINE(HAVE_KUIDGID_T, 1, [kuid_t/kgid_t in use])
1071                 ])
1072         ],[
1073                 AC_MSG_RESULT(no)
1074         ])
1075 ])
1076
1077 dnl #
1078 dnl # 2.6.39 API change,
1079 dnl # __put_task_struct() was exported by the mainline kernel.
1080 dnl #
1081 AC_DEFUN([SPL_AC_PUT_TASK_STRUCT],
1082         [AC_MSG_CHECKING([whether __put_task_struct() is available])
1083         SPL_LINUX_TRY_COMPILE_SYMBOL([
1084                 #include <linux/sched.h>
1085         ], [
1086                 __put_task_struct(NULL);
1087         ], [__put_task_struct], [], [
1088                 AC_MSG_RESULT(yes)
1089                 AC_DEFINE(HAVE_PUT_TASK_STRUCT, 1,
1090                           [__put_task_struct() is available])
1091         ], [
1092                 AC_MSG_RESULT(no)
1093         ])
1094 ])
1095
1096 dnl #
1097 dnl # 2.6.35 API change,
1098 dnl # Unused 'struct dentry *' removed from vfs_fsync() prototype.
1099 dnl #
1100 AC_DEFUN([SPL_AC_2ARGS_VFS_FSYNC], [
1101         AC_MSG_CHECKING([whether vfs_fsync() wants 2 args])
1102         SPL_LINUX_TRY_COMPILE([
1103                 #include <linux/fs.h>
1104         ],[
1105                 vfs_fsync(NULL, 0);
1106         ],[
1107                 AC_MSG_RESULT(yes)
1108                 AC_DEFINE(HAVE_2ARGS_VFS_FSYNC, 1, [vfs_fsync() wants 2 args])
1109         ],[
1110                 AC_MSG_RESULT(no)
1111         ])
1112 ])
1113
1114 dnl #
1115 dnl # 3.5 API change,
1116 dnl # inode_operations.truncate_range removed
1117 dnl #
1118 AC_DEFUN([SPL_AC_INODE_TRUNCATE_RANGE], [
1119         AC_MSG_CHECKING([whether truncate_range() inode operation is available])
1120         SPL_LINUX_TRY_COMPILE([
1121                 #include <linux/fs.h>
1122         ],[
1123                 struct inode_operations ops;
1124                 ops.truncate_range = NULL;
1125         ],[
1126                 AC_MSG_RESULT(yes)
1127                 AC_DEFINE(HAVE_INODE_TRUNCATE_RANGE, 1,
1128                         [truncate_range() inode operation is available])
1129         ],[
1130                 AC_MSG_RESULT(no)
1131         ])
1132 ])
1133
1134 dnl #
1135 dnl # Linux 2.6.38 - 3.x API
1136 dnl #
1137 AC_DEFUN([SPL_AC_KERNEL_FILE_FALLOCATE], [
1138         AC_MSG_CHECKING([whether fops->fallocate() exists])
1139         SPL_LINUX_TRY_COMPILE([
1140                 #include <linux/fs.h>
1141         ],[
1142                 long (*fallocate) (struct file *, int, loff_t, loff_t) = NULL;
1143                 struct file_operations fops __attribute__ ((unused)) = {
1144                         .fallocate = fallocate,
1145                 };
1146         ],[
1147                 AC_MSG_RESULT(yes)
1148                 AC_DEFINE(HAVE_FILE_FALLOCATE, 1, [fops->fallocate() exists])
1149         ],[
1150                 AC_MSG_RESULT(no)
1151         ])
1152 ])
1153
1154 dnl #
1155 dnl # Linux 2.6.x - 2.6.37 API
1156 dnl #
1157 AC_DEFUN([SPL_AC_KERNEL_INODE_FALLOCATE], [
1158         AC_MSG_CHECKING([whether iops->fallocate() exists])
1159         SPL_LINUX_TRY_COMPILE([
1160                 #include <linux/fs.h>
1161         ],[
1162                 long (*fallocate) (struct inode *, int, loff_t, loff_t) = NULL;
1163                 struct inode_operations fops __attribute__ ((unused)) = {
1164                         .fallocate = fallocate,
1165                 };
1166         ],[
1167                 AC_MSG_RESULT(yes)
1168                 AC_DEFINE(HAVE_INODE_FALLOCATE, 1, [fops->fallocate() exists])
1169         ],[
1170                 AC_MSG_RESULT(no)
1171         ])
1172 ])
1173
1174 dnl #
1175 dnl # PaX Linux 2.6.38 - 3.x API
1176 dnl #
1177 AC_DEFUN([SPL_AC_PAX_KERNEL_FILE_FALLOCATE], [
1178         AC_MSG_CHECKING([whether fops->fallocate() exists])
1179         SPL_LINUX_TRY_COMPILE([
1180                 #include <linux/fs.h>
1181         ],[
1182                 long (*fallocate) (struct file *, int, loff_t, loff_t) = NULL;
1183                 struct file_operations_no_const fops __attribute__ ((unused)) = {
1184                         .fallocate = fallocate,
1185                 };
1186         ],[
1187                 AC_MSG_RESULT(yes)
1188                 AC_DEFINE(HAVE_FILE_FALLOCATE, 1, [fops->fallocate() exists])
1189         ],[
1190                 AC_MSG_RESULT(no)
1191         ])
1192 ])
1193
1194 dnl #
1195 dnl # The fallocate callback was moved from the inode_operations
1196 dnl # structure to the file_operations structure.
1197 dnl #
1198 AC_DEFUN([SPL_AC_KERNEL_FALLOCATE], [
1199         SPL_AC_KERNEL_FILE_FALLOCATE
1200         SPL_AC_KERNEL_INODE_FALLOCATE
1201         SPL_AC_PAX_KERNEL_FILE_FALLOCATE
1202 ])
1203
1204 dnl #
1205 dnl # 2.6.33 API change. Also backported in RHEL5 as of 2.6.18-190.el5.
1206 dnl # Earlier versions of rwsem_is_locked() were inline and had a race
1207 dnl # condition.  The fixed version is exported as a symbol.  The race
1208 dnl # condition is fixed by acquiring sem->wait_lock, so we must not
1209 dnl # call that version while holding sem->wait_lock.
1210 dnl #
1211 AC_DEFUN([SPL_AC_EXPORTED_RWSEM_IS_LOCKED],
1212         [AC_MSG_CHECKING([whether rwsem_is_locked() acquires sem->wait_lock])
1213         SPL_LINUX_TRY_COMPILE_SYMBOL([
1214                 #include <linux/rwsem.h>
1215                 int rwsem_is_locked(struct rw_semaphore *sem) { return 0; }
1216         ], [], [rwsem_is_locked], [lib/rwsem-spinlock.c], [
1217                 AC_MSG_RESULT(yes)
1218                 AC_DEFINE(RWSEM_IS_LOCKED_TAKES_WAIT_LOCK, 1,
1219                           [rwsem_is_locked() acquires sem->wait_lock])
1220         ], [
1221                 AC_MSG_RESULT(no)
1222         ])
1223 ])
1224
1225 dnl #
1226 dnl # zlib inflate compat,
1227 dnl # Verify the kernel has CONFIG_ZLIB_INFLATE support enabled.
1228 dnl #
1229 AC_DEFUN([SPL_AC_CONFIG_ZLIB_INFLATE], [
1230         AC_MSG_CHECKING([whether CONFIG_ZLIB_INFLATE is defined])
1231         SPL_LINUX_TRY_COMPILE([
1232                 #if !defined(CONFIG_ZLIB_INFLATE) && \
1233                     !defined(CONFIG_ZLIB_INFLATE_MODULE)
1234                 #error CONFIG_ZLIB_INFLATE not defined
1235                 #endif
1236         ],[ ],[
1237                 AC_MSG_RESULT([yes])
1238         ],[
1239                 AC_MSG_RESULT([no])
1240                 AC_MSG_ERROR([
1241         *** This kernel does not include the required zlib inflate support.
1242         *** Rebuild the kernel with CONFIG_ZLIB_INFLATE=y|m set.])
1243         ])
1244 ])
1245
1246 dnl #
1247 dnl # zlib deflate compat,
1248 dnl # Verify the kernel has CONFIG_ZLIB_DEFLATE support enabled.
1249 dnl #
1250 AC_DEFUN([SPL_AC_CONFIG_ZLIB_DEFLATE], [
1251         AC_MSG_CHECKING([whether CONFIG_ZLIB_DEFLATE is defined])
1252         SPL_LINUX_TRY_COMPILE([
1253                 #if !defined(CONFIG_ZLIB_DEFLATE) && \
1254                     !defined(CONFIG_ZLIB_DEFLATE_MODULE)
1255                 #error CONFIG_ZLIB_DEFLATE not defined
1256                 #endif
1257         ],[ ],[
1258                 AC_MSG_RESULT([yes])
1259         ],[
1260                 AC_MSG_RESULT([no])
1261                 AC_MSG_ERROR([
1262         *** This kernel does not include the required zlib deflate support.
1263         *** Rebuild the kernel with CONFIG_ZLIB_DEFLATE=y|m set.])
1264         ])
1265 ])
1266
1267 dnl #
1268 dnl # 2.6.39 API compat,
1269 dnl # The function zlib_deflate_workspacesize() now take 2 arguments.
1270 dnl # This was done to avoid always having to allocate the maximum size
1271 dnl # workspace (268K).  The caller can now specific the windowBits and
1272 dnl # memLevel compression parameters to get a smaller workspace.
1273 dnl #
1274 AC_DEFUN([SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE],
1275         [AC_MSG_CHECKING([whether zlib_deflate_workspacesize() wants 2 args])
1276         SPL_LINUX_TRY_COMPILE([
1277                 #include <linux/zlib.h>
1278         ],[
1279                 return zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL);
1280         ],[
1281                 AC_MSG_RESULT(yes)
1282                 AC_DEFINE(HAVE_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE, 1,
1283                           [zlib_deflate_workspacesize() wants 2 args])
1284         ],[
1285                 AC_MSG_RESULT(no)
1286         ])
1287 ])
1288
1289 dnl #
1290 dnl # 2.6.39 API change,
1291 dnl # Shrinker adjust to use common shrink_control structure.
1292 dnl #
1293 AC_DEFUN([SPL_AC_SHRINK_CONTROL_STRUCT], [
1294         AC_MSG_CHECKING([whether struct shrink_control exists])
1295         SPL_LINUX_TRY_COMPILE([
1296                 #include <linux/mm.h>
1297         ],[
1298                 struct shrink_control sc __attribute__ ((unused));
1299
1300                 sc.nr_to_scan = 0;
1301                 sc.gfp_mask = GFP_KERNEL;
1302         ],[
1303                 AC_MSG_RESULT(yes)
1304                 AC_DEFINE(HAVE_SHRINK_CONTROL_STRUCT, 1,
1305                         [struct shrink_control exists])
1306         ],[
1307                 AC_MSG_RESULT(no)
1308         ])
1309 ])
1310
1311 dnl #
1312 dnl # 3.1 API Change
1313 dnl #
1314 dnl # The rw_semaphore.wait_lock member was changed from spinlock_t to
1315 dnl # raw_spinlock_t at commit ddb6c9b58a19edcfac93ac670b066c836ff729f1.
1316 dnl #
1317 AC_DEFUN([SPL_AC_RWSEM_SPINLOCK_IS_RAW], [
1318         AC_MSG_CHECKING([whether struct rw_semaphore member wait_lock is raw])
1319         tmp_flags="$EXTRA_KCFLAGS"
1320         EXTRA_KCFLAGS="-Werror"
1321         SPL_LINUX_TRY_COMPILE([
1322                 #include <linux/rwsem.h>
1323         ],[
1324                 struct rw_semaphore dummy_semaphore __attribute__ ((unused));
1325                 raw_spinlock_t dummy_lock __attribute__ ((unused));
1326                 dummy_semaphore.wait_lock = dummy_lock;
1327         ],[
1328                 AC_MSG_RESULT(yes)
1329                 AC_DEFINE(RWSEM_SPINLOCK_IS_RAW, 1,
1330                 [struct rw_semaphore member wait_lock is raw_spinlock_t])
1331         ],[
1332                 AC_MSG_RESULT(no)
1333         ])
1334         EXTRA_KCFLAGS="$tmp_flags"
1335 ])
1336
1337 dnl #
1338 dnl # 3.9 API change,
1339 dnl # Moved things from linux/sched.h to linux/sched/rt.h
1340 dnl #
1341 AC_DEFUN([SPL_AC_SCHED_RT_HEADER],
1342         [AC_MSG_CHECKING([whether header linux/sched/rt.h exists])
1343         SPL_LINUX_TRY_COMPILE([
1344                 #include <linux/sched.h>
1345                 #include <linux/sched/rt.h>
1346         ],[
1347                 return 0;
1348         ],[
1349                 AC_DEFINE(HAVE_SCHED_RT_HEADER, 1, [linux/sched/rt.h exists])
1350                 AC_MSG_RESULT(yes)
1351         ],[
1352                 AC_MSG_RESULT(no)
1353         ])
1354 ])
1355
1356 dnl #
1357 dnl # 3.9 API change,
1358 dnl # vfs_getattr() uses 2 args
1359 dnl # It takes struct path * instead of struct vfsmount * and struct dentry *
1360 dnl #
1361 AC_DEFUN([SPL_AC_2ARGS_VFS_GETATTR], [
1362         AC_MSG_CHECKING([whether vfs_getattr() wants])
1363         SPL_LINUX_TRY_COMPILE([
1364                 #include <linux/fs.h>
1365         ],[
1366                 vfs_getattr((struct path *) NULL,
1367                         (struct kstat *)NULL);
1368         ],[
1369                 AC_MSG_RESULT(2 args)
1370                 AC_DEFINE(HAVE_2ARGS_VFS_GETATTR, 1,
1371                           [vfs_getattr wants 2 args])
1372         ],[
1373                 SPL_LINUX_TRY_COMPILE([
1374                         #include <linux/fs.h>
1375                 ],[
1376                         vfs_getattr((struct vfsmount *)NULL,
1377                                 (struct dentry *)NULL,
1378                                 (struct kstat *)NULL);
1379                 ],[
1380                         AC_MSG_RESULT(3 args)
1381                 ],[
1382                         AC_MSG_ERROR(unknown)
1383                 ])
1384         ])
1385 ])
1386
1387 dnl #
1388 dnl # 2.6.36 API compatibility.
1389 dnl # Added usleep_range timer.
1390 dnl # usleep_range is a finer precision implementation of msleep
1391 dnl # designed to be a drop-in replacement for udelay where a precise
1392 dnl # sleep / busy-wait is unnecessary.
1393 dnl #
1394 AC_DEFUN([SPL_AC_USLEEP_RANGE], [
1395         AC_MSG_CHECKING([whether usleep_range() is available])
1396         SPL_LINUX_TRY_COMPILE([
1397                 #include <linux/delay.h>
1398         ],[
1399                 usleep_range(0, 0);
1400         ],[
1401                 AC_MSG_RESULT(yes)
1402                 AC_DEFINE(HAVE_USLEEP_RANGE, 1,
1403                           [usleep_range is available])
1404         ],[
1405                 AC_MSG_RESULT(no)
1406         ])
1407 ])
1408
1409 dnl #
1410 dnl # 2.6.35 API change,
1411 dnl # The cachep->gfpflags member was renamed cachep->allocflags.  These are
1412 dnl # private allocation flags which are applied when allocating a new slab
1413 dnl # in kmem_getpages().  Unfortunately there is no public API for setting
1414 dnl # non-default flags.
1415 dnl #
1416 AC_DEFUN([SPL_AC_KMEM_CACHE_ALLOCFLAGS], [
1417         AC_MSG_CHECKING([whether struct kmem_cache has allocflags])
1418         SPL_LINUX_TRY_COMPILE([
1419                 #include <linux/slab.h>
1420         ],[
1421                 struct kmem_cache cachep __attribute__ ((unused));
1422                 cachep.allocflags = GFP_KERNEL;
1423         ],[
1424                 AC_MSG_RESULT(yes)
1425                 AC_DEFINE(HAVE_KMEM_CACHE_ALLOCFLAGS, 1,
1426                         [struct kmem_cache has allocflags])
1427         ],[
1428                 AC_MSG_RESULT(no)
1429
1430                 AC_MSG_CHECKING([whether struct kmem_cache has gfpflags])
1431                 SPL_LINUX_TRY_COMPILE([
1432                         #include <linux/slab.h>
1433                 ],[
1434                         struct kmem_cache cachep __attribute__ ((unused));
1435                         cachep.gfpflags = GFP_KERNEL;
1436                 ],[
1437                         AC_MSG_RESULT(yes)
1438                         AC_DEFINE(HAVE_KMEM_CACHE_GFPFLAGS, 1,
1439                                 [struct kmem_cache has gfpflags])
1440                 ],[
1441                         AC_MSG_RESULT(no)
1442                 ])
1443         ])
1444 ])
1445
1446 dnl #
1447 dnl # 3.17 API change,
1448 dnl # wait_on_bit() no longer requires an action argument. The former
1449 dnl # "wait_on_bit" interface required an 'action' function to be provided
1450 dnl # which does the actual waiting. There were over 20 such functions in the
1451 dnl # kernel, many of them identical, though most cases can be satisfied by one
1452 dnl # of just two functions: one which uses io_schedule() and one which just
1453 dnl # uses schedule().  This API change was made to consolidate all of those
1454 dnl # redundant wait functions.
1455 dnl #
1456 AC_DEFUN([SPL_AC_WAIT_ON_BIT], [
1457         AC_MSG_CHECKING([whether wait_on_bit() takes an action])
1458         SPL_LINUX_TRY_COMPILE([
1459                 #include <linux/wait.h>
1460         ],[
1461                 int (*action)(void *) = NULL;
1462                 wait_on_bit(NULL, 0, action, 0);
1463         ],[
1464                 AC_MSG_RESULT(yes)
1465                 AC_DEFINE(HAVE_WAIT_ON_BIT_ACTION, 1, [yes])
1466         ],[
1467                 AC_MSG_RESULT(no)
1468         ])
1469 ])