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="$KERNELCPPFLAGS -Wstrict-prototypes"
  18         AC_SUBST(KERNELCPPFLAGS)
  19
  20         SPL_AC_DEBUG
  21         SPL_AC_DEBUG_LOG
  22         SPL_AC_DEBUG_KMEM
  23         SPL_AC_DEBUG_KMEM_TRACKING
  24         SPL_AC_TEST_MODULE
  25         SPL_AC_ATOMIC_SPINLOCK
  26         SPL_AC_SHRINKER_CALLBACK
  27         SPL_AC_CTL_NAME
  28         SPL_AC_PDE_DATA
  29         SPL_AC_MUTEX_OWNER
  30         SPL_AC_MUTEX_OWNER_TASK_STRUCT
  31         SPL_AC_SET_FS_PWD_WITH_CONST
  32         SPL_AC_2ARGS_VFS_UNLINK
  33         SPL_AC_4ARGS_VFS_RENAME
  34         SPL_AC_VFS_FSYNC
  35         SPL_AC_2ARGS_VFS_FSYNC
  36         SPL_AC_INODE_TRUNCATE_RANGE
  37         SPL_AC_FS_STRUCT_SPINLOCK
  38         SPL_AC_KUIDGID_T
  39         SPL_AC_PUT_TASK_STRUCT
  40         SPL_AC_EXPORTED_RWSEM_IS_LOCKED
  41         SPL_AC_KERNEL_FALLOCATE
  42         SPL_AC_KERN_PATH
  43         SPL_AC_CONFIG_ZLIB_INFLATE
  44         SPL_AC_CONFIG_ZLIB_DEFLATE
  45         SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
  46         SPL_AC_SHRINK_CONTROL_STRUCT
  47         SPL_AC_RWSEM_SPINLOCK_IS_RAW
  48         SPL_AC_SCHED_RT_HEADER
  49         SPL_AC_2ARGS_VFS_GETATTR
  50         SPL_AC_USLEEP_RANGE
  51         SPL_AC_KMEM_CACHE_ALLOCFLAGS
  52         SPL_AC_WAIT_ON_BIT
  53 ])
  54
  55 AC_DEFUN([SPL_AC_MODULE_SYMVERS], [
  56         modpost=$LINUX/scripts/Makefile.modpost
  57         AC_MSG_CHECKING([kernel file name for module symbols])
  58         if test "x$enable_linux_builtin" != xyes -a -f "$modpost"; then
  59                 if grep -q Modules.symvers $modpost; then
  60                         LINUX_SYMBOLS=Modules.symvers
  61                 else
  62                         LINUX_SYMBOLS=Module.symvers
  63                 fi
  64
  65                 if ! test -f "$LINUX_OBJ/$LINUX_SYMBOLS"; then
  66                         AC_MSG_ERROR([
  67         *** Please make sure the kernel devel package for your distribution
  68         *** is installed.  If you are building with a custom kernel, make sure the
  69         *** kernel is configured, built, and the '--with-linux=PATH' configure
  70         *** option refers to the location of the kernel source.])
  71                 fi
  72         else
  73                 LINUX_SYMBOLS=NONE
  74         fi
  75         AC_MSG_RESULT($LINUX_SYMBOLS)
  76         AC_SUBST(LINUX_SYMBOLS)
  77 ])
  78
  79 AC_DEFUN([SPL_AC_KERNEL], [
  80         AC_ARG_WITH([linux],
  81                 AS_HELP_STRING([--with-linux=PATH],
  82                 [Path to kernel source]),
  83                 [kernelsrc="$withval"])
  84
  85         AC_ARG_WITH([linux-obj],
  86                 AS_HELP_STRING([--with-linux-obj=PATH],
  87                 [Path to kernel build objects]),
  88                 [kernelbuild="$withval"])
  89
  90         AC_MSG_CHECKING([kernel source directory])
  91         if test -z "$kernelsrc"; then
  92                 if test -e "/lib/modules/$(uname -r)/source"; then
  93                         headersdir="/lib/modules/$(uname -r)/source"
  94                         sourcelink=$(readlink -f "$headersdir")
  95                 elif test -e "/lib/modules/$(uname -r)/build"; then
  96                         headersdir="/lib/modules/$(uname -r)/build"
  97                         sourcelink=$(readlink -f "$headersdir")
  98                 else
  99                         sourcelink=$(ls -1d /usr/src/kernels/* \
 100                                      /usr/src/linux-* \
 101                                      2>/dev/null | grep -v obj | tail -1)
 102                 fi
 103
 104                 if test -n "$sourcelink" && test -e ${sourcelink}; then
 105                         kernelsrc=`readlink -f ${sourcelink}`
 106                 else
 107                         kernelsrc="[Not found]"
 108                 fi
 109         else
 110                 if test "$kernelsrc" = "NONE"; then
 111                         kernsrcver=NONE
 112                 fi
 113         fi
 114
 115         AC_MSG_RESULT([$kernelsrc])
 116         if test ! -d "$kernelsrc"; then
 117                 AC_MSG_ERROR([
 118         *** Please make sure the kernel devel package for your distribution
 119         *** is installed and then try again.  If that fails, you can specify the
 120         *** location of the kernel source with the '--with-linux=PATH' option.])
 121         fi
 122
 123         AC_MSG_CHECKING([kernel build directory])
 124         if test -z "$kernelbuild"; then
 125                 if test -e "/lib/modules/$(uname -r)/build"; then
 126                         kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
 127                 elif test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
 128                         kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
 129                 elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
 130                         kernelbuild=${kernelsrc}-obj/${target_cpu}/default
 131                 elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
 132                         kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
 133                 else
 134                         kernelbuild=${kernelsrc}
 135                 fi
 136         fi
 137         AC_MSG_RESULT([$kernelbuild])
 138
 139         AC_MSG_CHECKING([kernel source version])
 140         utsrelease1=$kernelbuild/include/linux/version.h
 141         utsrelease2=$kernelbuild/include/linux/utsrelease.h
 142         utsrelease3=$kernelbuild/include/generated/utsrelease.h
 143         if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
 144                 utsrelease=linux/version.h
 145         elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
 146                 utsrelease=linux/utsrelease.h
 147         elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
 148                 utsrelease=generated/utsrelease.h
 149         fi
 150
 151         if test "$utsrelease"; then
 152                 kernsrcver=`(echo "#include <$utsrelease>";
 153                              echo "kernsrcver=UTS_RELEASE") |
 154                              cpp -I $kernelbuild/include |
 155                              grep "^kernsrcver=" | cut -d \" -f 2`
 156
 157                 if test -z "$kernsrcver"; then
 158                         AC_MSG_RESULT([Not found])
 159                         AC_MSG_ERROR([*** Cannot determine kernel version.])
 160                 fi
 161         else
 162                 AC_MSG_RESULT([Not found])
 163                 if test "x$enable_linux_builtin" != xyes; then
 164                         AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
 165                 else
 166                         AC_MSG_ERROR([
 167         *** Cannot find UTS_RELEASE definition.
 168         *** Please run 'make prepare' inside the kernel source tree.])
 169                 fi
 170         fi
 171
 172         AC_MSG_RESULT([$kernsrcver])
 173
 174         LINUX=${kernelsrc}
 175         LINUX_OBJ=${kernelbuild}
 176         LINUX_VERSION=${kernsrcver}
 177
 178         AC_SUBST(LINUX)
 179         AC_SUBST(LINUX_OBJ)
 180         AC_SUBST(LINUX_VERSION)
 181
 182         SPL_AC_MODULE_SYMVERS
 183 ])
 184
 185 dnl #
 186 dnl # Default SPL user configuration
 187 dnl #
 188 AC_DEFUN([SPL_AC_CONFIG_USER], [])
 189
 190 dnl #
 191 dnl # Check for rpm+rpmbuild to build RPM packages.  If these tools
 192 dnl # are missing, it is non-fatal, but you will not be able to build
 193 dnl # RPM packages and will be warned if you try too.
 194 dnl #
 195 dnl # By default, the generic spec file will be used because it requires
 196 dnl # minimal dependencies.  Distribution specific spec files can be
 197 dnl # placed under the 'rpm/<distribution>' directory and enabled using
 198 dnl # the --with-spec=<distribution> configure option.
 199 dnl #
 200 AC_DEFUN([SPL_AC_RPM], [
 201         RPM=rpm
 202         RPMBUILD=rpmbuild
 203
 204         AC_MSG_CHECKING([whether $RPM is available])
 205         AS_IF([tmp=$($RPM --version 2>/dev/null)], [
 206                 RPM_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
 207                 HAVE_RPM=yes
 208                 AC_MSG_RESULT([$HAVE_RPM ($RPM_VERSION)])
 209         ],[
 210                 HAVE_RPM=no
 211                 AC_MSG_RESULT([$HAVE_RPM])
 212         ])
 213
 214         AC_MSG_CHECKING([whether $RPMBUILD is available])
 215         AS_IF([tmp=$($RPMBUILD --version 2>/dev/null)], [
 216                 RPMBUILD_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
 217                 HAVE_RPMBUILD=yes
 218                 AC_MSG_RESULT([$HAVE_RPMBUILD ($RPMBUILD_VERSION)])
 219         ],[
 220                 HAVE_RPMBUILD=no
 221                 AC_MSG_RESULT([$HAVE_RPMBUILD])
 222         ])
 223
 224         RPM_DEFINE_COMMON='--define "$(DEBUG_SPL) 1" --define "$(DEBUG_LOG) 1" --define "$(DEBUG_KMEM) 1" --define "$(DEBUG_KMEM_TRACKING) 1"'
 225         RPM_DEFINE_UTIL=
 226         RPM_DEFINE_KMOD='--define "kernels $(LINUX_VERSION)"'
 227         RPM_DEFINE_DKMS=
 228
 229         SRPM_DEFINE_COMMON='--define "build_src_rpm 1"'
 230         SRPM_DEFINE_UTIL=
 231         SRPM_DEFINE_KMOD=
 232         SRPM_DEFINE_DKMS=
 233
 234         RPM_SPEC_DIR="rpm/generic"
 235         AC_ARG_WITH([spec],
 236                 AS_HELP_STRING([--with-spec=SPEC],
 237                 [Spec files 'generic|fedora']),
 238                 [RPM_SPEC_DIR="rpm/$withval"])
 239
 240         AC_MSG_CHECKING([whether spec files are available])
 241         AC_MSG_RESULT([yes ($RPM_SPEC_DIR/*.spec.in)])
 242
 243         AC_SUBST(HAVE_RPM)
 244         AC_SUBST(RPM)
 245         AC_SUBST(RPM_VERSION)
 246
 247         AC_SUBST(HAVE_RPMBUILD)
 248         AC_SUBST(RPMBUILD)
 249         AC_SUBST(RPMBUILD_VERSION)
 250
 251         AC_SUBST(RPM_SPEC_DIR)
 252         AC_SUBST(RPM_DEFINE_UTIL)
 253         AC_SUBST(RPM_DEFINE_KMOD)
 254         AC_SUBST(RPM_DEFINE_DKMS)
 255         AC_SUBST(RPM_DEFINE_COMMON)
 256         AC_SUBST(SRPM_DEFINE_UTIL)
 257         AC_SUBST(SRPM_DEFINE_KMOD)
 258         AC_SUBST(SRPM_DEFINE_DKMS)
 259         AC_SUBST(SRPM_DEFINE_COMMON)
 260 ])
 261
 262 dnl #
 263 dnl # Check for dpkg+dpkg-buildpackage to build DEB packages.  If these
 264 dnl # tools are missing it is non-fatal but you will not be able to build
 265 dnl # DEB packages and will be warned if you try too.
 266 dnl #
 267 AC_DEFUN([SPL_AC_DPKG], [
 268         DPKG=dpkg
 269         DPKGBUILD=dpkg-buildpackage
 270
 271         AC_MSG_CHECKING([whether $DPKG is available])
 272         AS_IF([tmp=$($DPKG --version 2>/dev/null)], [
 273                 DPKG_VERSION=$(echo $tmp | $AWK '/Debian/ { print $[7] }')
 274                 HAVE_DPKG=yes
 275                 AC_MSG_RESULT([$HAVE_DPKG ($DPKG_VERSION)])
 276         ],[
 277                 HAVE_DPKG=no
 278                 AC_MSG_RESULT([$HAVE_DPKG])
 279         ])
 280
 281         AC_MSG_CHECKING([whether $DPKGBUILD is available])
 282         AS_IF([tmp=$($DPKGBUILD --version 2>/dev/null)], [
 283                 DPKGBUILD_VERSION=$(echo $tmp | \
 284                     $AWK '/Debian/ { print $[4] }' | cut -f-4 -d'.')
 285                 HAVE_DPKGBUILD=yes
 286                 AC_MSG_RESULT([$HAVE_DPKGBUILD ($DPKGBUILD_VERSION)])
 287         ],[
 288                 HAVE_DPKGBUILD=no
 289                 AC_MSG_RESULT([$HAVE_DPKGBUILD])
 290         ])
 291
 292         AC_SUBST(HAVE_DPKG)
 293         AC_SUBST(DPKG)
 294         AC_SUBST(DPKG_VERSION)
 295
 296         AC_SUBST(HAVE_DPKGBUILD)
 297         AC_SUBST(DPKGBUILD)
 298         AC_SUBST(DPKGBUILD_VERSION)
 299 ])
 300
 301 dnl #
 302 dnl # Until native packaging for various different packing systems
 303 dnl # can be added the least we can do is attempt to use alien to
 304 dnl # convert the RPM packages to the needed package type.  This is
 305 dnl # a hack but so far it has worked reasonable well.
 306 dnl #
 307 AC_DEFUN([SPL_AC_ALIEN], [
 308         ALIEN=alien
 309
 310         AC_MSG_CHECKING([whether $ALIEN is available])
 311         AS_IF([tmp=$($ALIEN --version 2>/dev/null)], [
 312                 ALIEN_VERSION=$(echo $tmp | $AWK '{ print $[3] }')
 313                 HAVE_ALIEN=yes
 314                 AC_MSG_RESULT([$HAVE_ALIEN ($ALIEN_VERSION)])
 315         ],[
 316                 HAVE_ALIEN=no
 317                 AC_MSG_RESULT([$HAVE_ALIEN])
 318         ])
 319
 320         AC_SUBST(HAVE_ALIEN)
 321         AC_SUBST(ALIEN)
 322         AC_SUBST(ALIEN_VERSION)
 323 ])
 324
 325 dnl #
 326 dnl # Using the VENDOR tag from config.guess set the default
 327 dnl # package type for 'make pkg': (rpm | deb | tgz)
 328 dnl #
 329 AC_DEFUN([SPL_AC_DEFAULT_PACKAGE], [
 330         AC_MSG_CHECKING([linux distribution])
 331         if test -f /etc/toss-release ; then
 332                 VENDOR=toss ;
 333         elif test -f /etc/fedora-release ; then
 334                 VENDOR=fedora ;
 335         elif test -f /etc/redhat-release ; then
 336                 VENDOR=redhat ;
 337         elif test -f /etc/gentoo-release ; then
 338                 VENDOR=gentoo ;
 339         elif test -f /etc/arch-release ; then
 340                 VENDOR=arch ;
 341         elif test -f /etc/SuSE-release ; then
 342                 VENDOR=sles ;
 343         elif test -f /etc/slackware-version ; then
 344                 VENDOR=slackware ;
 345         elif test -f /etc/lunar.release ; then
 346                 VENDOR=lunar ;
 347         elif test -f /etc/lsb-release ; then
 348                 VENDOR=ubuntu ;
 349         elif test -f /etc/debian_version ; then
 350                 VENDOR=debian ;
 351         else
 352                 VENDOR= ;
 353         fi
 354         AC_MSG_RESULT([$VENDOR])
 355         AC_SUBST(VENDOR)
 356
 357         AC_MSG_CHECKING([default package type])
 358         case "$VENDOR" in
 359                 toss)       DEFAULT_PACKAGE=rpm  ;;
 360                 redhat)     DEFAULT_PACKAGE=rpm  ;;
 361                 fedora)     DEFAULT_PACKAGE=rpm  ;;
 362                 gentoo)     DEFAULT_PACKAGE=tgz  ;;
 363                 arch)       DEFAULT_PACKAGE=tgz  ;;
 364                 sles)       DEFAULT_PACKAGE=rpm  ;;
 365                 slackware)  DEFAULT_PACKAGE=tgz  ;;
 366                 lunar)      DEFAULT_PACKAGE=tgz  ;;
 367                 ubuntu)     DEFAULT_PACKAGE=deb  ;;
 368                 debian)     DEFAULT_PACKAGE=deb  ;;
 369                 *)          DEFAULT_PACKAGE=rpm  ;;
 370         esac
 371
 372         AC_MSG_RESULT([$DEFAULT_PACKAGE])
 373         AC_SUBST(DEFAULT_PACKAGE)
 374 ])
 375
 376 dnl #
 377 dnl # Default SPL user configuration
 378 dnl #
 379 AC_DEFUN([SPL_AC_PACKAGE], [
 380         SPL_AC_DEFAULT_PACKAGE
 381         SPL_AC_RPM
 382         SPL_AC_DPKG
 383         SPL_AC_ALIEN
 384 ])
 385
 386 AC_DEFUN([SPL_AC_LICENSE], [
 387         AC_MSG_CHECKING([spl author])
 388         AC_MSG_RESULT([$SPL_META_AUTHOR])
 389
 390         AC_MSG_CHECKING([spl license])
 391         AC_MSG_RESULT([$SPL_META_LICENSE])
 392 ])
 393
 394 AC_DEFUN([SPL_AC_CONFIG], [
 395         SPL_CONFIG=all
 396         AC_ARG_WITH([config],
 397                 AS_HELP_STRING([--with-config=CONFIG],
 398                 [Config file 'kernel|user|all|srpm']),
 399                 [SPL_CONFIG="$withval"])
 400         AC_ARG_ENABLE([linux-builtin],
 401                 [AC_HELP_STRING([--enable-linux-builtin],
 402                 [Configure for builtin in-tree kernel modules @<:@default=no@:>@])],
 403                 [],
 404                 [enable_linux_builtin=no])
 405
 406         AC_MSG_CHECKING([spl config])
 407         AC_MSG_RESULT([$SPL_CONFIG]);
 408         AC_SUBST(SPL_CONFIG)
 409
 410         case "$SPL_CONFIG" in
 411                 kernel) SPL_AC_CONFIG_KERNEL ;;
 412                 user)   SPL_AC_CONFIG_USER   ;;
 413                 all)    SPL_AC_CONFIG_KERNEL
 414                         SPL_AC_CONFIG_USER   ;;
 415                 srpm)                        ;;
 416                 *)
 417                 AC_MSG_RESULT([Error!])
 418                 AC_MSG_ERROR([Bad value "$SPL_CONFIG" for --with-config,
 419                              user kernel|user|all|srpm]) ;;
 420         esac
 421
 422         AM_CONDITIONAL([CONFIG_USER],
 423                        [test "$SPL_CONFIG" = user -o "$SPL_CONFIG" = all])
 424         AM_CONDITIONAL([CONFIG_KERNEL],
 425                        [test "$SPL_CONFIG" = kernel -o "$SPL_CONFIG" = all] &&
 426                        [test "x$enable_linux_builtin" != xyes ])
 427 ])
 428
 429 dnl #
 430 dnl # Enable if the SPL should be compiled with internal debugging enabled.
 431 dnl # By default this support is disabled.
 432 dnl #
 433 AC_DEFUN([SPL_AC_DEBUG], [
 434         AC_MSG_CHECKING([whether debugging is enabled])
 435         AC_ARG_ENABLE([debug],
 436                 [AS_HELP_STRING([--enable-debug],
 437                 [Enable generic debug support @<:@default=no@:>@])],
 438                 [],
 439                 [enable_debug=no])
 440
 441         AS_IF([test "x$enable_debug" = xyes],
 442         [
 443                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG -Werror"
 444                 DEBUG_CFLAGS="-DDEBUG -Werror"
 445                 DEBUG_SPL="_with_debug"
 446         ], [
 447                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DNDEBUG"
 448                 DEBUG_CFLAGS="-DNDEBUG"
 449                 DEBUG_SPL="_without_debug"
 450         ])
 451
 452         AC_SUBST(DEBUG_CFLAGS)
 453         AC_SUBST(DEBUG_SPL)
 454         AC_MSG_RESULT([$enable_debug])
 455 ])
 456
 457 dnl #
 458 dnl # Enabled by default it provides a basic debug log infrastructure.
 459 dnl # Each subsystem registers itself with a name and logs messages
 460 dnl # using predefined types.  If the debug mask it set to allow the
 461 dnl # message type it will be written to the internal log.  The log
 462 dnl # can be dumped to a file by echoing 1 to the 'dump' proc entry,
 463 dnl # after dumping the log it must be decoded using the spl utility.
 464 dnl #
 465 dnl # echo 1 >/proc/sys/kernel/spl/debug/dump
 466 dnl # spl /tmp/spl-log.xxx.yyy /tmp/spl-log.xxx.yyy.txt
 467 dnl #
 468 AC_DEFUN([SPL_AC_DEBUG_LOG], [
 469         AC_ARG_ENABLE([debug-log],
 470                 [AS_HELP_STRING([--enable-debug-log],
 471                 [Enable basic debug logging @<:@default=yes@:>@])],
 472                 [],
 473                 [enable_debug_log=yes])
 474
 475         AS_IF([test "x$enable_debug_log" = xyes],
 476         [
 477                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_LOG"
 478                 DEBUG_LOG="_with_debug_log"
 479                 AC_DEFINE([DEBUG_LOG], [1],
 480                 [Define to 1 to enable basic debug logging])
 481         ], [
 482                 DEBUG_LOG="_without_debug_log"
 483         ])
 484
 485         AC_SUBST(DEBUG_LOG)
 486         AC_MSG_CHECKING([whether basic debug logging is enabled])
 487         AC_MSG_RESULT([$enable_debug_log])
 488 ])
 489
 490 dnl #
 491 dnl # Enabled by default it provides a minimal level of memory tracking.
 492 dnl # A total count of bytes allocated is kept for each alloc and free.
 493 dnl # Then at module unload time a report to the console will be printed
 494 dnl # if memory was leaked.  Additionally, /proc/spl/kmem/slab will exist
 495 dnl # and provide an easy way to inspect the kmem based slab.
 496 dnl #
 497 AC_DEFUN([SPL_AC_DEBUG_KMEM], [
 498         AC_ARG_ENABLE([debug-kmem],
 499                 [AS_HELP_STRING([--enable-debug-kmem],
 500                 [Enable basic kmem accounting @<:@default=yes@:>@])],
 501                 [],
 502                 [enable_debug_kmem=yes])
 503
 504         AS_IF([test "x$enable_debug_kmem" = xyes],
 505         [
 506                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM"
 507                 DEBUG_KMEM="_with_debug_kmem"
 508                 AC_DEFINE([DEBUG_KMEM], [1],
 509                 [Define to 1 to enable basic kmem accounting])
 510         ], [
 511                 DEBUG_KMEM="_without_debug_kmem"
 512         ])
 513
 514         AC_SUBST(DEBUG_KMEM)
 515         AC_MSG_CHECKING([whether basic kmem accounting is enabled])
 516         AC_MSG_RESULT([$enable_debug_kmem])
 517 ])
 518
 519 dnl #
 520 dnl # Disabled by default it provides detailed memory tracking.  This
 521 dnl # feature also requires --enable-debug-kmem to be set.  When enabled
 522 dnl # not only will total bytes be tracked but also the location of every
 523 dnl # alloc and free.  When the SPL module is unloaded a list of all leaked
 524 dnl # addresses and where they were allocated will be dumped to the console.
 525 dnl # Enabling this feature has a significant impact on performance but it
 526 dnl # makes finding memory leaks pretty straight forward.
 527 dnl #
 528 AC_DEFUN([SPL_AC_DEBUG_KMEM_TRACKING], [
 529         AC_ARG_ENABLE([debug-kmem-tracking],
 530                 [AS_HELP_STRING([--enable-debug-kmem-tracking],
 531                 [Enable detailed kmem tracking  @<:@default=no@:>@])],
 532                 [],
 533                 [enable_debug_kmem_tracking=no])
 534
 535         AS_IF([test "x$enable_debug_kmem_tracking" = xyes],
 536         [
 537                 KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_KMEM_TRACKING"
 538                 DEBUG_KMEM_TRACKING="_with_debug_kmem_tracking"
 539                 AC_DEFINE([DEBUG_KMEM_TRACKING], [1],
 540                 [Define to 1 to enable detailed kmem tracking])
 541         ], [
 542                 DEBUG_KMEM_TRACKING="_without_debug_kmem_tracking"
 543         ])
 544
 545         AC_SUBST(DEBUG_KMEM_TRACKING)
 546         AC_MSG_CHECKING([whether detailed kmem tracking is enabled])
 547         AC_MSG_RESULT([$enable_debug_kmem_tracking])
 548 ])
 549
 550 dnl #
 551 dnl # SPL_LINUX_CONFTEST
 552 dnl #
 553 AC_DEFUN([SPL_LINUX_CONFTEST], [
 554 cat confdefs.h - <<_ACEOF >conftest.c
 555 $1
 556 _ACEOF
 557 ])
 558
 559 dnl #
 560 dnl # SPL_LANG_PROGRAM(C)([PROLOGUE], [BODY])
 561 dnl #
 562 m4_define([SPL_LANG_PROGRAM], [
 563 $1
 564 int
 565 main (void)
 566 {
 567 dnl Do *not* indent the following line: there may be CPP directives.
 568 dnl Don't move the `;' right after for the same reason.
 569 $2
 570   ;
 571   return 0;
 572 }
 573 ])
 574
 575 dnl #
 576 dnl # SPL_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
 577 dnl #
 578 AC_DEFUN([SPL_LINUX_COMPILE_IFELSE], [
 579         m4_ifvaln([$1], [SPL_LINUX_CONFTEST([$1])])
 580         rm -Rf build && mkdir -p build && touch build/conftest.mod.c
 581         echo "obj-m := conftest.o" >build/Makefile
 582         modpost_flag=''
 583         test "x$enable_linux_builtin" = xyes && modpost_flag='modpost=true' # fake modpost stage
 584         AS_IF(
 585                 [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])],
 586                 [$4],
 587                 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
 588         )
 589         rm -Rf build
 590 ])
 591
 592 dnl #
 593 dnl # SPL_LINUX_TRY_COMPILE like AC_TRY_COMPILE
 594 dnl #
 595 AC_DEFUN([SPL_LINUX_TRY_COMPILE],
 596         [SPL_LINUX_COMPILE_IFELSE(
 597         [AC_LANG_SOURCE([SPL_LANG_PROGRAM([[$1]], [[$2]])])],
 598         [modules],
 599         [test -s build/conftest.o],
 600         [$3], [$4])
 601 ])
 602
 603 dnl #
 604 dnl # SPL_CHECK_SYMBOL_EXPORT
 605 dnl # check symbol exported or not
 606 dnl #
 607 AC_DEFUN([SPL_CHECK_SYMBOL_EXPORT], [
 608         grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
 609                 $LINUX_OBJ/Module*.symvers 2>/dev/null
 610         rc=$?
 611         if test $rc -ne 0; then
 612                 export=0
 613                 for file in $2; do
 614                         grep -q -E "EXPORT_SYMBOL.*($1)" \
 615                                 "$LINUX_OBJ/$file" 2>/dev/null
 616                         rc=$?
 617                         if test $rc -eq 0; then
 618                                 export=1
 619                                 break;
 620                         fi
 621                 done
 622                 if test $export -eq 0; then :
 623                         $4
 624                 else :
 625                         $3
 626                 fi
 627         else :
 628                 $3
 629         fi
 630 ])
 631
 632 dnl #
 633 dnl # SPL_LINUX_TRY_COMPILE_SYMBOL
 634 dnl # like SPL_LINUX_TRY_COMPILE, except SPL_CHECK_SYMBOL_EXPORT
 635 dnl # is called if not compiling for builtin
 636 dnl #
 637 AC_DEFUN([SPL_LINUX_TRY_COMPILE_SYMBOL], [
 638         SPL_LINUX_TRY_COMPILE([$1], [$2], [rc=0], [rc=1])
 639         if test $rc -ne 0; then :
 640                 $6
 641         else
 642                 if test "x$enable_linux_builtin" != xyes; then
 643                         SPL_CHECK_SYMBOL_EXPORT([$3], [$4], [rc=0], [rc=1])
 644                 fi
 645                 if test $rc -ne 0; then :
 646                         $6
 647                 else :
 648                         $5
 649                 fi
 650         fi
 651 ])
 652
 653 dnl #
 654 dnl # SPL_CHECK_SYMBOL_HEADER
 655 dnl # check if a symbol prototype is defined in listed headers.
 656 dnl #
 657 AC_DEFUN([SPL_CHECK_SYMBOL_HEADER], [
 658         AC_MSG_CHECKING([whether symbol $1 exists in header])
 659         header=0
 660         for file in $3; do
 661                 grep -q "$2" "$LINUX/$file" 2>/dev/null
 662                 rc=$?
 663                 if test $rc -eq 0; then
 664                         header=1
 665                         break;
 666                 fi
 667         done
 668         if test $header -eq 0; then
 669                 AC_MSG_RESULT([no])
 670                 $5
 671         else
 672                 AC_MSG_RESULT([yes])
 673                 $4
 674         fi
 675 ])
 676
 677 dnl #
 678 dnl # SPL_CHECK_HEADER
 679 dnl # check whether header exists and define HAVE_$2_HEADER
 680 dnl #
 681 AC_DEFUN([SPL_CHECK_HEADER],
 682         [AC_MSG_CHECKING([whether header $1 exists])
 683         SPL_LINUX_TRY_COMPILE([
 684                 #include <$1>
 685         ],[
 686                 return 0;
 687         ],[
 688                 AC_DEFINE(HAVE_$2_HEADER, 1, [$1 exists])
 689                 AC_MSG_RESULT(yes)
 690                 $3
 691         ],[
 692                 AC_MSG_RESULT(no)
 693                 $4
 694         ])
 695 ])
 696
 697 dnl #
 698 dnl # Basic toolchain sanity check.  Verify that kernel modules can
 699 dnl # be built and which symbols can be used.
 700 dnl #
 701 AC_DEFUN([SPL_AC_TEST_MODULE],
 702         [AC_MSG_CHECKING([whether modules can be built])
 703         SPL_LINUX_TRY_COMPILE([],[],[
 704                 AC_MSG_RESULT([yes])
 705         ],[
 706                 AC_MSG_RESULT([no])
 707                 if test "x$enable_linux_builtin" != xyes; then
 708                         AC_MSG_ERROR([*** Unable to build an empty module.])
 709                 else
 710                         AC_MSG_ERROR([
 711         *** Unable to build an empty module.
 712         *** Please run 'make scripts' inside the kernel source tree.])
 713                 fi
 714         ])
 715
 716         AC_RUN_IFELSE([
 717                 AC_LANG_PROGRAM([
 718                         #include "$LINUX/include/linux/license.h"
 719                 ], [
 720                         return !license_is_gpl_compatible("$SPL_META_LICENSE");
 721                 ])
 722         ], [
 723                 AC_DEFINE([SPL_IS_GPL_COMPATIBLE], [1],
 724                     [Define to 1 if GPL-only symbols can be used])
 725         ], [
 726         ])
 727 ])
 728
 729 dnl #
 730 dnl # Use the atomic implemenation based on global spinlocks.  This
 731 dnl # should only be needed by 32-bit kernels which do not provide
 732 dnl # the atomic64_* API.  It may be optionally enabled as a fallback
 733 dnl # if problems are observed with the direct mapping to the native
 734 dnl # Linux atomic operations.  You may not disable atomic spinlocks
 735 dnl # if you kernel does not an atomic64_* API.
 736 dnl #
 737 AC_DEFUN([SPL_AC_ATOMIC_SPINLOCK], [
 738         AC_ARG_ENABLE([atomic-spinlocks],
 739                 [AS_HELP_STRING([--enable-atomic-spinlocks],
 740                 [Atomic types use spinlocks @<:@default=check@:>@])],
 741                 [],
 742                 [enable_atomic_spinlocks=check])
 743
 744         SPL_LINUX_TRY_COMPILE([
 745                 #include <linux/fs.h>
 746         ],[
 747                 atomic64_t *ptr __attribute__ ((unused));
 748         ],[
 749                 have_atomic64_t=yes
 750                 AC_DEFINE(HAVE_ATOMIC64_T, 1,
 751                         [kernel defines atomic64_t])
 752         ],[
 753                 have_atomic64_t=no
 754         ])
 755
 756         AS_IF([test "x$enable_atomic_spinlocks" = xcheck], [
 757                 AS_IF([test "x$have_atomic64_t" = xyes], [
 758                         enable_atomic_spinlocks=no
 759                 ],[
 760                         enable_atomic_spinlocks=yes
 761                 ])
 762         ])
 763
 764         AS_IF([test "x$enable_atomic_spinlocks" = xyes], [
 765                 AC_DEFINE([ATOMIC_SPINLOCK], [1],
 766                         [Atomic types use spinlocks])
 767         ],[
 768                 AS_IF([test "x$have_atomic64_t" = xno], [
 769                         AC_MSG_FAILURE(
 770                         [--disable-atomic-spinlocks given but required atomic64 support is unavailable])
 771                 ])
 772         ])
 773
 774         AC_MSG_CHECKING([whether atomic types use spinlocks])
 775         AC_MSG_RESULT([$enable_atomic_spinlocks])
 776
 777         AC_MSG_CHECKING([whether kernel defines atomic64_t])
 778         AC_MSG_RESULT([$have_atomic64_t])
 779 ])
 780
 781 AC_DEFUN([SPL_AC_SHRINKER_CALLBACK],[
 782         tmp_flags="$EXTRA_KCFLAGS"
 783         EXTRA_KCFLAGS="-Werror"
 784         dnl #
 785         dnl # 2.6.23 to 2.6.34 API change
 786         dnl # ->shrink(int nr_to_scan, gfp_t gfp_mask)
 787         dnl #
 788         AC_MSG_CHECKING([whether old 2-argument shrinker exists])
 789         SPL_LINUX_TRY_COMPILE([
 790                 #include <linux/mm.h>
 791
 792                 int shrinker_cb(int nr_to_scan, gfp_t gfp_mask);
 793         ],[
 794                 struct shrinker cache_shrinker = {
 795                         .shrink = shrinker_cb,
 796                         .seeks = DEFAULT_SEEKS,
 797                 };
 798                 register_shrinker(&cache_shrinker);
 799         ],[
 800                 AC_MSG_RESULT(yes)
 801                 AC_DEFINE(HAVE_2ARGS_OLD_SHRINKER_CALLBACK, 1,
 802                         [old shrinker callback wants 2 args])
 803         ],[
 804                 AC_MSG_RESULT(no)
 805                 dnl #
 806                 dnl # 2.6.35 - 2.6.39 API change
 807                 dnl # ->shrink(struct shrinker *,
 808                 dnl #          int nr_to_scan, gfp_t gfp_mask)
 809                 dnl #
 810                 AC_MSG_CHECKING([whether old 3-argument shrinker exists])
 811                 SPL_LINUX_TRY_COMPILE([
 812                         #include <linux/mm.h>
 813
 814                         int shrinker_cb(struct shrinker *, int nr_to_scan,
 815                                         gfp_t gfp_mask);
 816                 ],[
 817                         struct shrinker cache_shrinker = {
 818                                 .shrink = shrinker_cb,
 819                                 .seeks = DEFAULT_SEEKS,
 820                         };
 821                         register_shrinker(&cache_shrinker);
 822                 ],[
 823                         AC_MSG_RESULT(yes)
 824                         AC_DEFINE(HAVE_3ARGS_SHRINKER_CALLBACK, 1,
 825                                 [old shrinker callback wants 3 args])
 826                 ],[
 827                         AC_MSG_RESULT(no)
 828                         dnl #
 829                         dnl # 3.0 - 3.11 API change
 830                         dnl # ->shrink(struct shrinker *,
 831                         dnl #          struct shrink_control *sc)
 832                         dnl #
 833                         AC_MSG_CHECKING(
 834                                 [whether new 2-argument shrinker exists])
 835                         SPL_LINUX_TRY_COMPILE([
 836                                 #include <linux/mm.h>
 837
 838                                 int shrinker_cb(struct shrinker *,
 839                                                 struct shrink_control *sc);
 840                         ],[
 841                                 struct shrinker cache_shrinker = {
 842                                         .shrink = shrinker_cb,
 843                                         .seeks = DEFAULT_SEEKS,
 844                                 };
 845                                 register_shrinker(&cache_shrinker);
 846                         ],[
 847                                 AC_MSG_RESULT(yes)
 848                                 AC_DEFINE(HAVE_2ARGS_NEW_SHRINKER_CALLBACK, 1,
 849                                         [new shrinker callback wants 2 args])
 850                         ],[
 851                                 AC_MSG_RESULT(no)
 852                                 dnl #
 853                                 dnl # 3.12 API change,
 854                                 dnl # ->shrink() is logically split in to
 855                                 dnl # ->count_objects() and ->scan_objects()
 856                                 dnl #
 857                                 AC_MSG_CHECKING(
 858                                     [whether ->count_objects callback exists])
 859                                 SPL_LINUX_TRY_COMPILE([
 860                                         #include <linux/mm.h>
 861
 862                                         unsigned long shrinker_cb(
 863                                                 struct shrinker *,
 864                                                 struct shrink_control *sc);
 865                                 ],[
 866                                         struct shrinker cache_shrinker = {
 867                                                 .count_objects = shrinker_cb,
 868                                                 .scan_objects = shrinker_cb,
 869                                                 .seeks = DEFAULT_SEEKS,
 870                                         };
 871                                         register_shrinker(&cache_shrinker);
 872                                 ],[
 873                                         AC_MSG_RESULT(yes)
 874                                         AC_DEFINE(HAVE_SPLIT_SHRINKER_CALLBACK,
 875                                                 1, [->count_objects exists])
 876                                 ],[
 877                                         AC_MSG_ERROR(error)
 878                                 ])
 879                         ])
 880                 ])
 881         ])
 882         EXTRA_KCFLAGS="$tmp_flags"
 883 ])
 884
 885 dnl #
 886 dnl # 2.6.33 API change,
 887 dnl # Removed .ctl_name from struct ctl_table.
 888 dnl #
 889 AC_DEFUN([SPL_AC_CTL_NAME], [
 890         AC_MSG_CHECKING([whether struct ctl_table has ctl_name])
 891         SPL_LINUX_TRY_COMPILE([
 892                 #include <linux/sysctl.h>
 893         ],[
 894                 struct ctl_table ctl __attribute__ ((unused));
 895                 ctl.ctl_name = 0;
 896         ],[
 897                 AC_MSG_RESULT(yes)
 898                 AC_DEFINE(HAVE_CTL_NAME, 1, [struct ctl_table has ctl_name])
 899         ],[
 900                 AC_MSG_RESULT(no)
 901         ])
 902 ])
 903
 904 dnl #
 905 dnl # 2.6.29 API change,
 906 dnl # Adaptive mutexs were introduced which track the mutex owner.  The
 907 dnl # mutex wrappers leverage this functionality to avoid tracking the
 908 dnl # owner multipe times.
 909 dnl #
 910 AC_DEFUN([SPL_AC_MUTEX_OWNER], [
 911         AC_MSG_CHECKING([whether struct mutex has owner])
 912         SPL_LINUX_TRY_COMPILE([
 913                 #include <linux/mutex.h>
 914         ],[
 915                 struct mutex mtx __attribute__ ((unused));
 916                 mtx.owner = NULL;
 917         ],[
 918                 AC_MSG_RESULT(yes)
 919                 AC_DEFINE(HAVE_MUTEX_OWNER, 1, [struct mutex has owner])
 920         ],[
 921                 AC_MSG_RESULT(no)
 922         ])
 923 ])
 924
 925 dnl #
 926 dnl # 2.6.39 API change,
 927 dnl # Owner type change.  A Linux mutex prior to 2.6.39 would store
 928 dnl # the owner as a thread_info pointer when CONFIG_DEBUG_MUTEXES
 929 dnl # was defined.  As of 2.6.39 this was changed to a task_struct
 930 dnl # pointer which frankly makes a lot more sense.
 931 dnl #
 932 AC_DEFUN([SPL_AC_MUTEX_OWNER_TASK_STRUCT], [
 933         AC_MSG_CHECKING([whether struct mutex owner is a task_struct])
 934         tmp_flags="$EXTRA_KCFLAGS"
 935         EXTRA_KCFLAGS="-Werror"
 936         SPL_LINUX_TRY_COMPILE([
 937                 #include <linux/mutex.h>
 938                 #include <linux/sched.h>
 939         ],[
 940                 struct mutex mtx __attribute__ ((unused));
 941                 mtx.owner = current;
 942         ],[
 943                 AC_MSG_RESULT(yes)
 944                 AC_DEFINE(HAVE_MUTEX_OWNER_TASK_STRUCT, 1,
 945                 [struct mutex owner is a task_struct])
 946         ],[
 947                 AC_MSG_RESULT(no)
 948         ])
 949         EXTRA_KCFLAGS="$tmp_flags"
 950 ])
 951
 952 dnl #
 953 dnl # 3.10 API change,
 954 dnl # PDE is replaced by PDE_DATA
 955 dnl #
 956 AC_DEFUN([SPL_AC_PDE_DATA], [
 957         AC_MSG_CHECKING([whether PDE_DATA() is available])
 958         SPL_LINUX_TRY_COMPILE_SYMBOL([
 959                 #include <linux/proc_fs.h>
 960         ], [
 961                 PDE_DATA(NULL);
 962         ], [PDE_DATA], [], [
 963                 AC_MSG_RESULT(yes)
 964                 AC_DEFINE(HAVE_PDE_DATA, 1, [yes])
 965         ],[
 966                 AC_MSG_RESULT(no)
 967         ])
 968 ])
 969
 970 dnl #
 971 dnl # 3.9 API change
 972 dnl # set_fs_pwd takes const struct path *
 973 dnl #
 974 AC_DEFUN([SPL_AC_SET_FS_PWD_WITH_CONST],
 975         tmp_flags="$EXTRA_KCFLAGS"
 976         EXTRA_KCFLAGS="-Werror"
 977         [AC_MSG_CHECKING([whether set_fs_pwd() requires const struct path *])
 978         SPL_LINUX_TRY_COMPILE([
 979                 #include <linux/spinlock.h>
 980                 #include <linux/fs_struct.h>
 981                 #include <linux/path.h>
 982                 void (*const set_fs_pwd_func)
 983                         (struct fs_struct *, const struct path *)
 984                         = set_fs_pwd;
 985         ],[
 986                 return 0;
 987         ],[
 988                 AC_MSG_RESULT(yes)
 989                 AC_DEFINE(HAVE_SET_FS_PWD_WITH_CONST, 1,
 990                         [set_fs_pwd() needs const path *])
 991         ],[
 992                 SPL_LINUX_TRY_COMPILE([
 993                         #include <linux/spinlock.h>
 994                         #include <linux/fs_struct.h>
 995                         #include <linux/path.h>
 996                         void (*const set_fs_pwd_func)
 997                                 (struct fs_struct *, struct path *)
 998                                 = set_fs_pwd;
 999                 ],[
1000                         return 0;
1001                 ],[
1002                         AC_MSG_RESULT(no)
1003                 ],[
1004                         AC_MSG_ERROR(unknown)
1005                 ])
1006         ])
1007         EXTRA_KCFLAGS="$tmp_flags"
1008 ])
1009
1010 dnl #
1011 dnl # 3.13 API change
1012 dnl # vfs_unlink() updated to take a third delegated_inode argument.
1013 dnl #
1014 AC_DEFUN([SPL_AC_2ARGS_VFS_UNLINK],
1015         [AC_MSG_CHECKING([whether vfs_unlink() wants 2 args])
1016         SPL_LINUX_TRY_COMPILE([
1017                 #include <linux/fs.h>
1018         ],[
1019                 vfs_unlink((struct inode *) NULL, (struct dentry *) NULL);
1020         ],[
1021                 AC_MSG_RESULT(yes)
1022                 AC_DEFINE(HAVE_2ARGS_VFS_UNLINK, 1,
1023                           [vfs_unlink() wants 2 args])
1024         ],[
1025                 AC_MSG_RESULT(no)
1026                 dnl #
1027                 dnl # Linux 3.13 API change
1028                 dnl # Added delegated inode
1029                 dnl #
1030                 AC_MSG_CHECKING([whether vfs_unlink() wants 3 args])
1031                 SPL_LINUX_TRY_COMPILE([
1032                         #include <linux/fs.h>
1033                 ],[
1034                         vfs_unlink((struct inode *) NULL,
1035                                 (struct dentry *) NULL,
1036                                 (struct inode **) NULL);
1037                 ],[
1038                         AC_MSG_RESULT(yes)
1039                         AC_DEFINE(HAVE_3ARGS_VFS_UNLINK, 1,
1040                                   [vfs_unlink() wants 3 args])
1041                 ],[
1042                         AC_MSG_ERROR(no)
1043                 ])
1044
1045         ])
1046 ])
1047
1048 dnl #
1049 dnl # 3.13 and 3.15 API changes
1050 dnl # Added delegated inode and flags argument.
1051 dnl #
1052 AC_DEFUN([SPL_AC_4ARGS_VFS_RENAME],
1053         [AC_MSG_CHECKING([whether vfs_rename() wants 4 args])
1054         SPL_LINUX_TRY_COMPILE([
1055                 #include <linux/fs.h>
1056         ],[
1057                 vfs_rename((struct inode *) NULL, (struct dentry *) NULL,
1058                         (struct inode *) NULL, (struct dentry *) NULL);
1059         ],[
1060                 AC_MSG_RESULT(yes)
1061                 AC_DEFINE(HAVE_4ARGS_VFS_RENAME, 1,
1062                           [vfs_rename() wants 4 args])
1063         ],[
1064                 AC_MSG_RESULT(no)
1065                 dnl #
1066                 dnl # Linux 3.13 API change
1067                 dnl # Added delegated inode
1068                 dnl #
1069                 AC_MSG_CHECKING([whether vfs_rename() wants 5 args])
1070                 SPL_LINUX_TRY_COMPILE([
1071                         #include <linux/fs.h>
1072                 ],[
1073                         vfs_rename((struct inode *) NULL,
1074                                 (struct dentry *) NULL,
1075                                 (struct inode *) NULL,
1076                                 (struct dentry *) NULL,
1077                                 (struct inode **) NULL);
1078                 ],[
1079                         AC_MSG_RESULT(yes)
1080                         AC_DEFINE(HAVE_5ARGS_VFS_RENAME, 1,
1081                                   [vfs_rename() wants 5 args])
1082                 ],[
1083                         AC_MSG_RESULT(no)
1084                         dnl #
1085                         dnl # Linux 3.15 API change
1086                         dnl # Added flags
1087                         dnl #
1088                         AC_MSG_CHECKING([whether vfs_rename() wants 6 args])
1089                         SPL_LINUX_TRY_COMPILE([
1090                                 #include <linux/fs.h>
1091                         ],[
1092                                 vfs_rename((struct inode *) NULL,
1093                                         (struct dentry *) NULL,
1094                                         (struct inode *) NULL,
1095                                         (struct dentry *) NULL,
1096                                         (struct inode **) NULL,
1097                                         (unsigned int) 0);
1098                         ],[
1099                                 AC_MSG_RESULT(yes)
1100                                 AC_DEFINE(HAVE_6ARGS_VFS_RENAME, 1,
1101                                           [vfs_rename() wants 6 args])
1102                         ],[
1103                                 AC_MSG_ERROR(no)
1104                         ])
1105                 ])
1106         ])
1107 ])
1108
1109 dnl #
1110 dnl # 2.6.36 API change,
1111 dnl # The 'struct fs_struct->lock' was changed from a rwlock_t to
1112 dnl # a spinlock_t to improve the fastpath performance.
1113 dnl #
1114 AC_DEFUN([SPL_AC_FS_STRUCT_SPINLOCK], [
1115         AC_MSG_CHECKING([whether struct fs_struct uses spinlock_t])
1116         tmp_flags="$EXTRA_KCFLAGS"
1117         EXTRA_KCFLAGS="-Werror"
1118         SPL_LINUX_TRY_COMPILE([
1119                 #include <linux/sched.h>
1120                 #include <linux/fs_struct.h>
1121         ],[
1122                 struct fs_struct fs;
1123                 spin_lock_init(&fs.lock);
1124         ],[
1125                 AC_MSG_RESULT(yes)
1126                 AC_DEFINE(HAVE_FS_STRUCT_SPINLOCK, 1,
1127                           [struct fs_struct uses spinlock_t])
1128         ],[
1129                 AC_MSG_RESULT(no)
1130         ])
1131         EXTRA_KCFLAGS="$tmp_flags"
1132 ])
1133
1134 dnl #
1135 dnl # User namespaces, use kuid_t in place of uid_t
1136 dnl # where available. Not strictly a user namespaces thing
1137 dnl # but it should prevent surprises
1138 dnl #
1139 AC_DEFUN([SPL_AC_KUIDGID_T], [
1140         AC_MSG_CHECKING([whether kuid_t/kgid_t is available])
1141         SPL_LINUX_TRY_COMPILE([
1142                 #include <linux/uidgid.h>
1143         ], [
1144                 kuid_t userid = KUIDT_INIT(0);
1145                 kgid_t groupid = KGIDT_INIT(0);
1146         ],[
1147                 SPL_LINUX_TRY_COMPILE([
1148                         #include <linux/uidgid.h>
1149                 ], [
1150                         kuid_t userid = 0;
1151                         kgid_t groupid = 0;
1152                 ],[
1153                         AC_MSG_RESULT(yes; optional)
1154                 ],[
1155                         AC_MSG_RESULT(yes; mandatory)
1156                         AC_DEFINE(HAVE_KUIDGID_T, 1, [kuid_t/kgid_t in use])
1157                 ])
1158         ],[
1159                 AC_MSG_RESULT(no)
1160         ])
1161 ])
1162
1163 dnl #
1164 dnl # 2.6.39 API change,
1165 dnl # __put_task_struct() was exported by the mainline kernel.
1166 dnl #
1167 AC_DEFUN([SPL_AC_PUT_TASK_STRUCT],
1168         [AC_MSG_CHECKING([whether __put_task_struct() is available])
1169         SPL_LINUX_TRY_COMPILE_SYMBOL([
1170                 #include <linux/sched.h>
1171         ], [
1172                 __put_task_struct(NULL);
1173         ], [__put_task_struct], [], [
1174                 AC_MSG_RESULT(yes)
1175                 AC_DEFINE(HAVE_PUT_TASK_STRUCT, 1,
1176                           [__put_task_struct() is available])
1177         ], [
1178                 AC_MSG_RESULT(no)
1179         ])
1180 ])
1181
1182 dnl #
1183 dnl # 2.6.29 API change,
1184 dnl # vfs_fsync() funcation added, prior to this use file_fsync().
1185 dnl #
1186 AC_DEFUN([SPL_AC_VFS_FSYNC],
1187         [AC_MSG_CHECKING([whether vfs_fsync() is available])
1188         SPL_LINUX_TRY_COMPILE_SYMBOL([
1189                 #include <linux/fs.h>
1190         ], [
1191                 (void) vfs_fsync;
1192         ], [vfs_fsync], [fs/sync.c], [
1193                 AC_MSG_RESULT(yes)
1194                 AC_DEFINE(HAVE_VFS_FSYNC, 1, [vfs_fsync() is available])
1195         ], [
1196                 AC_MSG_RESULT(no)
1197         ])
1198 ])
1199
1200 dnl #
1201 dnl # 2.6.35 API change,
1202 dnl # Unused 'struct dentry *' removed from vfs_fsync() prototype.
1203 dnl #
1204 AC_DEFUN([SPL_AC_2ARGS_VFS_FSYNC], [
1205         AC_MSG_CHECKING([whether vfs_fsync() wants 2 args])
1206         SPL_LINUX_TRY_COMPILE([
1207                 #include <linux/fs.h>
1208         ],[
1209                 vfs_fsync(NULL, 0);
1210         ],[
1211                 AC_MSG_RESULT(yes)
1212                 AC_DEFINE(HAVE_2ARGS_VFS_FSYNC, 1, [vfs_fsync() wants 2 args])
1213         ],[
1214                 AC_MSG_RESULT(no)
1215         ])
1216 ])
1217
1218 dnl #
1219 dnl # 3.5 API change,
1220 dnl # inode_operations.truncate_range removed
1221 dnl #
1222 AC_DEFUN([SPL_AC_INODE_TRUNCATE_RANGE], [
1223         AC_MSG_CHECKING([whether truncate_range() inode operation is available])
1224         SPL_LINUX_TRY_COMPILE([
1225                 #include <linux/fs.h>
1226         ],[
1227                 struct inode_operations ops;
1228                 ops.truncate_range = NULL;
1229         ],[
1230                 AC_MSG_RESULT(yes)
1231                 AC_DEFINE(HAVE_INODE_TRUNCATE_RANGE, 1,
1232                         [truncate_range() inode operation is available])
1233         ],[
1234                 AC_MSG_RESULT(no)
1235         ])
1236 ])
1237
1238 dnl #
1239 dnl # Linux 2.6.38 - 3.x API
1240 dnl #
1241 AC_DEFUN([SPL_AC_KERNEL_FILE_FALLOCATE], [
1242         AC_MSG_CHECKING([whether fops->fallocate() exists])
1243         SPL_LINUX_TRY_COMPILE([
1244                 #include <linux/fs.h>
1245         ],[
1246                 long (*fallocate) (struct file *, int, loff_t, loff_t) = NULL;
1247                 struct file_operations fops __attribute__ ((unused)) = {
1248                         .fallocate = fallocate,
1249                 };
1250         ],[
1251                 AC_MSG_RESULT(yes)
1252                 AC_DEFINE(HAVE_FILE_FALLOCATE, 1, [fops->fallocate() exists])
1253         ],[
1254                 AC_MSG_RESULT(no)
1255         ])
1256 ])
1257
1258 dnl #
1259 dnl # Linux 2.6.x - 2.6.37 API
1260 dnl #
1261 AC_DEFUN([SPL_AC_KERNEL_INODE_FALLOCATE], [
1262         AC_MSG_CHECKING([whether iops->fallocate() exists])
1263         SPL_LINUX_TRY_COMPILE([
1264                 #include <linux/fs.h>
1265         ],[
1266                 long (*fallocate) (struct inode *, int, loff_t, loff_t) = NULL;
1267                 struct inode_operations fops __attribute__ ((unused)) = {
1268                         .fallocate = fallocate,
1269                 };
1270         ],[
1271                 AC_MSG_RESULT(yes)
1272                 AC_DEFINE(HAVE_INODE_FALLOCATE, 1, [fops->fallocate() exists])
1273         ],[
1274                 AC_MSG_RESULT(no)
1275         ])
1276 ])
1277
1278 dnl #
1279 dnl # PaX Linux 2.6.38 - 3.x API
1280 dnl #
1281 AC_DEFUN([SPL_AC_PAX_KERNEL_FILE_FALLOCATE], [
1282         AC_MSG_CHECKING([whether fops->fallocate() exists])
1283         SPL_LINUX_TRY_COMPILE([
1284                 #include <linux/fs.h>
1285         ],[
1286                 long (*fallocate) (struct file *, int, loff_t, loff_t) = NULL;
1287                 struct file_operations_no_const fops __attribute__ ((unused)) = {
1288                         .fallocate = fallocate,
1289                 };
1290         ],[
1291                 AC_MSG_RESULT(yes)
1292                 AC_DEFINE(HAVE_FILE_FALLOCATE, 1, [fops->fallocate() exists])
1293         ],[
1294                 AC_MSG_RESULT(no)
1295         ])
1296 ])
1297
1298 dnl #
1299 dnl # The fallocate callback was moved from the inode_operations
1300 dnl # structure to the file_operations structure.
1301 dnl #
1302 AC_DEFUN([SPL_AC_KERNEL_FALLOCATE], [
1303         SPL_AC_KERNEL_FILE_FALLOCATE
1304         SPL_AC_KERNEL_INODE_FALLOCATE
1305         SPL_AC_PAX_KERNEL_FILE_FALLOCATE
1306 ])
1307
1308 dnl #
1309 dnl # 2.6.33 API change. Also backported in RHEL5 as of 2.6.18-190.el5.
1310 dnl # Earlier versions of rwsem_is_locked() were inline and had a race
1311 dnl # condition.  The fixed version is exported as a symbol.  The race
1312 dnl # condition is fixed by acquiring sem->wait_lock, so we must not
1313 dnl # call that version while holding sem->wait_lock.
1314 dnl #
1315 AC_DEFUN([SPL_AC_EXPORTED_RWSEM_IS_LOCKED],
1316         [AC_MSG_CHECKING([whether rwsem_is_locked() acquires sem->wait_lock])
1317         SPL_LINUX_TRY_COMPILE_SYMBOL([
1318                 #include <linux/rwsem.h>
1319                 int rwsem_is_locked(struct rw_semaphore *sem) { return 0; }
1320         ], [], [rwsem_is_locked], [lib/rwsem-spinlock.c], [
1321                 AC_MSG_RESULT(yes)
1322                 AC_DEFINE(RWSEM_IS_LOCKED_TAKES_WAIT_LOCK, 1,
1323                           [rwsem_is_locked() acquires sem->wait_lock])
1324         ], [
1325                 AC_MSG_RESULT(no)
1326         ])
1327 ])
1328
1329 dnl #
1330 dnl # 2.6.28 API change
1331 dnl # The kern_path() function has been introduced. We adopt it as the new way
1332 dnl # of looking up paths. When it is not available, we emulate it using the
1333 dnl # older interfaces.
1334 dnl #
1335 AC_DEFUN([SPL_AC_KERN_PATH],
1336         [AC_MSG_CHECKING([whether kern_path() is available])
1337         SPL_LINUX_TRY_COMPILE_SYMBOL([
1338                 #include <linux/namei.h>
1339         ], [
1340                 int r = kern_path(NULL, 0, NULL);
1341         ], [kern_path], [fs/namei.c], [
1342                 AC_MSG_RESULT(yes)
1343                 AC_DEFINE(HAVE_KERN_PATH, 1,
1344                           [kern_path() is available])
1345         ], [
1346                 AC_MSG_RESULT(no)
1347                 AC_MSG_CHECKING([whether path_lookup() is available])
1348                 SPL_LINUX_TRY_COMPILE_SYMBOL([
1349                         #include <linux/namei.h>
1350                 ], [
1351                         int r = path_lookup(NULL, 0, NULL);
1352                 ], [path_lookup], [fs/namei.c], [
1353                         AC_MSG_RESULT(yes)
1354                         AC_DEFINE(HAVE_KERN_PATH, 1,
1355                                   [kern_path() is available])
1356                 ], [
1357                         AC_MSG_RESULT(no)
1358                         AC_MSG_ERROR([
1359         *** Neither kern_path() nor path_lookup() is available.
1360         *** Please file an issue:
1361         *** https://github.com/zfsonlinux/spl/issues/new])
1362
1363                 ])
1364         ])
1365 ])
1366
1367 dnl #
1368 dnl # zlib inflate compat,
1369 dnl # Verify the kernel has CONFIG_ZLIB_INFLATE support enabled.
1370 dnl #
1371 AC_DEFUN([SPL_AC_CONFIG_ZLIB_INFLATE], [
1372         AC_MSG_CHECKING([whether CONFIG_ZLIB_INFLATE is defined])
1373         SPL_LINUX_TRY_COMPILE([
1374                 #if !defined(CONFIG_ZLIB_INFLATE) && \
1375                     !defined(CONFIG_ZLIB_INFLATE_MODULE)
1376                 #error CONFIG_ZLIB_INFLATE not defined
1377                 #endif
1378         ],[ ],[
1379                 AC_MSG_RESULT([yes])
1380         ],[
1381                 AC_MSG_RESULT([no])
1382                 AC_MSG_ERROR([
1383         *** This kernel does not include the required zlib inflate support.
1384         *** Rebuild the kernel with CONFIG_ZLIB_INFLATE=y|m set.])
1385         ])
1386 ])
1387
1388 dnl #
1389 dnl # zlib deflate compat,
1390 dnl # Verify the kernel has CONFIG_ZLIB_DEFLATE support enabled.
1391 dnl #
1392 AC_DEFUN([SPL_AC_CONFIG_ZLIB_DEFLATE], [
1393         AC_MSG_CHECKING([whether CONFIG_ZLIB_DEFLATE is defined])
1394         SPL_LINUX_TRY_COMPILE([
1395                 #if !defined(CONFIG_ZLIB_DEFLATE) && \
1396                     !defined(CONFIG_ZLIB_DEFLATE_MODULE)
1397                 #error CONFIG_ZLIB_DEFLATE not defined
1398                 #endif
1399         ],[ ],[
1400                 AC_MSG_RESULT([yes])
1401         ],[
1402                 AC_MSG_RESULT([no])
1403                 AC_MSG_ERROR([
1404         *** This kernel does not include the required zlib deflate support.
1405         *** Rebuild the kernel with CONFIG_ZLIB_DEFLATE=y|m set.])
1406         ])
1407 ])
1408
1409 dnl #
1410 dnl # 2.6.39 API compat,
1411 dnl # The function zlib_deflate_workspacesize() now take 2 arguments.
1412 dnl # This was done to avoid always having to allocate the maximum size
1413 dnl # workspace (268K).  The caller can now specific the windowBits and
1414 dnl # memLevel compression parameters to get a smaller workspace.
1415 dnl #
1416 AC_DEFUN([SPL_AC_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE],
1417         [AC_MSG_CHECKING([whether zlib_deflate_workspacesize() wants 2 args])
1418         SPL_LINUX_TRY_COMPILE([
1419                 #include <linux/zlib.h>
1420         ],[
1421                 return zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL);
1422         ],[
1423                 AC_MSG_RESULT(yes)
1424                 AC_DEFINE(HAVE_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE, 1,
1425                           [zlib_deflate_workspacesize() wants 2 args])
1426         ],[
1427                 AC_MSG_RESULT(no)
1428         ])
1429 ])
1430
1431 dnl #
1432 dnl # 2.6.39 API change,
1433 dnl # Shrinker adjust to use common shrink_control structure.
1434 dnl #
1435 AC_DEFUN([SPL_AC_SHRINK_CONTROL_STRUCT], [
1436         AC_MSG_CHECKING([whether struct shrink_control exists])
1437         SPL_LINUX_TRY_COMPILE([
1438                 #include <linux/mm.h>
1439         ],[
1440                 struct shrink_control sc __attribute__ ((unused));
1441
1442                 sc.nr_to_scan = 0;
1443                 sc.gfp_mask = GFP_KERNEL;
1444         ],[
1445                 AC_MSG_RESULT(yes)
1446                 AC_DEFINE(HAVE_SHRINK_CONTROL_STRUCT, 1,
1447                         [struct shrink_control exists])
1448         ],[
1449                 AC_MSG_RESULT(no)
1450         ])
1451 ])
1452
1453 dnl #
1454 dnl # 3.1 API Change
1455 dnl #
1456 dnl # The rw_semaphore.wait_lock member was changed from spinlock_t to
1457 dnl # raw_spinlock_t at commit ddb6c9b58a19edcfac93ac670b066c836ff729f1.
1458 dnl #
1459 AC_DEFUN([SPL_AC_RWSEM_SPINLOCK_IS_RAW], [
1460         AC_MSG_CHECKING([whether struct rw_semaphore member wait_lock is raw])
1461         tmp_flags="$EXTRA_KCFLAGS"
1462         EXTRA_KCFLAGS="-Werror"
1463         SPL_LINUX_TRY_COMPILE([
1464                 #include <linux/rwsem.h>
1465         ],[
1466                 struct rw_semaphore dummy_semaphore __attribute__ ((unused));
1467                 raw_spinlock_t dummy_lock __attribute__ ((unused));
1468                 dummy_semaphore.wait_lock = dummy_lock;
1469         ],[
1470                 AC_MSG_RESULT(yes)
1471                 AC_DEFINE(RWSEM_SPINLOCK_IS_RAW, 1,
1472                 [struct rw_semaphore member wait_lock is raw_spinlock_t])
1473         ],[
1474                 AC_MSG_RESULT(no)
1475         ])
1476         EXTRA_KCFLAGS="$tmp_flags"
1477 ])
1478
1479 dnl #
1480 dnl # 3.9 API change,
1481 dnl # Moved things from linux/sched.h to linux/sched/rt.h
1482 dnl #
1483 AC_DEFUN([SPL_AC_SCHED_RT_HEADER],
1484         [AC_MSG_CHECKING([whether header linux/sched/rt.h exists])
1485         SPL_LINUX_TRY_COMPILE([
1486                 #include <linux/sched.h>
1487                 #include <linux/sched/rt.h>
1488         ],[
1489                 return 0;
1490         ],[
1491                 AC_DEFINE(HAVE_SCHED_RT_HEADER, 1, [linux/sched/rt.h exists])
1492                 AC_MSG_RESULT(yes)
1493         ],[
1494                 AC_MSG_RESULT(no)
1495         ])
1496 ])
1497
1498 dnl #
1499 dnl # 3.9 API change,
1500 dnl # vfs_getattr() uses 2 args
1501 dnl # It takes struct path * instead of struct vfsmount * and struct dentry *
1502 dnl #
1503 AC_DEFUN([SPL_AC_2ARGS_VFS_GETATTR], [
1504         AC_MSG_CHECKING([whether vfs_getattr() wants])
1505         SPL_LINUX_TRY_COMPILE([
1506                 #include <linux/fs.h>
1507         ],[
1508                 vfs_getattr((struct path *) NULL,
1509                         (struct kstat *)NULL);
1510         ],[
1511                 AC_MSG_RESULT(2 args)
1512                 AC_DEFINE(HAVE_2ARGS_VFS_GETATTR, 1,
1513                           [vfs_getattr wants 2 args])
1514         ],[
1515                 SPL_LINUX_TRY_COMPILE([
1516                         #include <linux/fs.h>
1517                 ],[
1518                         vfs_getattr((struct vfsmount *)NULL,
1519                                 (struct dentry *)NULL,
1520                                 (struct kstat *)NULL);
1521                 ],[
1522                         AC_MSG_RESULT(3 args)
1523                 ],[
1524                         AC_MSG_ERROR(unknown)
1525                 ])
1526         ])
1527 ])
1528
1529 dnl #
1530 dnl # 2.6.36 API compatibility.
1531 dnl # Added usleep_range timer.
1532 dnl # usleep_range is a finer precision implementation of msleep
1533 dnl # designed to be a drop-in replacement for udelay where a precise
1534 dnl # sleep / busy-wait is unnecessary.
1535 dnl #
1536 AC_DEFUN([SPL_AC_USLEEP_RANGE], [
1537         AC_MSG_CHECKING([whether usleep_range() is available])
1538         SPL_LINUX_TRY_COMPILE([
1539                 #include <linux/delay.h>
1540         ],[
1541                 usleep_range(0, 0);
1542         ],[
1543                 AC_MSG_RESULT(yes)
1544                 AC_DEFINE(HAVE_USLEEP_RANGE, 1,
1545                           [usleep_range is available])
1546         ],[
1547                 AC_MSG_RESULT(no)
1548         ])
1549 ])
1550
1551 dnl #
1552 dnl # 2.6.35 API change,
1553 dnl # The cachep->gfpflags member was renamed cachep->allocflags.  These are
1554 dnl # private allocation flags which are applied when allocating a new slab
1555 dnl # in kmem_getpages().  Unfortunately there is no public API for setting
1556 dnl # non-default flags.
1557 dnl #
1558 AC_DEFUN([SPL_AC_KMEM_CACHE_ALLOCFLAGS], [
1559         AC_MSG_CHECKING([whether struct kmem_cache has allocflags])
1560         SPL_LINUX_TRY_COMPILE([
1561                 #include <linux/slab.h>
1562         ],[
1563                 struct kmem_cache cachep __attribute__ ((unused));
1564                 cachep.allocflags = GFP_KERNEL;
1565         ],[
1566                 AC_MSG_RESULT(yes)
1567                 AC_DEFINE(HAVE_KMEM_CACHE_ALLOCFLAGS, 1,
1568                         [struct kmem_cache has allocflags])
1569         ],[
1570                 AC_MSG_RESULT(no)
1571
1572                 AC_MSG_CHECKING([whether struct kmem_cache has gfpflags])
1573                 SPL_LINUX_TRY_COMPILE([
1574                         #include <linux/slab.h>
1575                 ],[
1576                         struct kmem_cache cachep __attribute__ ((unused));
1577                         cachep.gfpflags = GFP_KERNEL;
1578                 ],[
1579                         AC_MSG_RESULT(yes)
1580                         AC_DEFINE(HAVE_KMEM_CACHE_GFPFLAGS, 1,
1581                                 [struct kmem_cache has gfpflags])
1582                 ],[
1583                         AC_MSG_RESULT(no)
1584                 ])
1585         ])
1586 ])
1587
1588 dnl #
1589 dnl # 3.17 API change,
1590 dnl # wait_on_bit() no longer requires an action argument. The former
1591 dnl # "wait_on_bit" interface required an 'action' function to be provided
1592 dnl # which does the actual waiting. There were over 20 such functions in the
1593 dnl # kernel, many of them identical, though most cases can be satisfied by one
1594 dnl # of just two functions: one which uses io_schedule() and one which just
1595 dnl # uses schedule().  This API change was made to consolidate all of those
1596 dnl # redundant wait functions.
1597 dnl #
1598 AC_DEFUN([SPL_AC_WAIT_ON_BIT], [
1599         AC_MSG_CHECKING([whether wait_on_bit() takes an action])
1600         SPL_LINUX_TRY_COMPILE([
1601                 #include <linux/wait.h>
1602         ],[
1603                 int (*action)(void *) = NULL;
1604                 wait_on_bit(NULL, 0, action, 0);
1605         ],[
1606                 AC_MSG_RESULT(yes)
1607                 AC_DEFINE(HAVE_WAIT_ON_BIT_ACTION, 1, [yes])
1608         ],[
1609                 AC_MSG_RESULT(no)
1610         ])
1611 ])