config/kernel.m4

   1 dnl #
   2 dnl # Default ZFS kernel configuration
   3 dnl #
   4 AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
   5         ZFS_AC_KERNEL
   6         ZFS_AC_SPL
   7         ZFS_AC_KERNEL_CONFIG
   8         ZFS_AC_KERNEL_BDEV_BLOCK_DEVICE_OPERATIONS
   9         ZFS_AC_KERNEL_TYPE_FMODE_T
  10         ZFS_AC_KERNEL_KOBJ_NAME_LEN
  11         ZFS_AC_KERNEL_BLKDEV_GET_BY_PATH
  12         ZFS_AC_KERNEL_OPEN_BDEV_EXCLUSIVE
  13         ZFS_AC_KERNEL_INVALIDATE_BDEV_ARGS
  14         ZFS_AC_KERNEL_BDEV_LOGICAL_BLOCK_SIZE
  15         ZFS_AC_KERNEL_BIO_EMPTY_BARRIER
  16         ZFS_AC_KERNEL_BIO_FAILFAST
  17         ZFS_AC_KERNEL_BIO_FAILFAST_DTD
  18         ZFS_AC_KERNEL_REQ_FAILFAST_MASK
  19         ZFS_AC_KERNEL_BIO_END_IO_T_ARGS
  20         ZFS_AC_KERNEL_BIO_RW_SYNC
  21         ZFS_AC_KERNEL_BIO_RW_SYNCIO
  22         ZFS_AC_KERNEL_REQ_SYNC
  23         ZFS_AC_KERNEL_BLK_END_REQUEST
  24         ZFS_AC_KERNEL_BLK_FETCH_REQUEST
  25         ZFS_AC_KERNEL_BLK_REQUEUE_REQUEST
  26         ZFS_AC_KERNEL_BLK_RQ_BYTES
  27         ZFS_AC_KERNEL_BLK_RQ_POS
  28         ZFS_AC_KERNEL_BLK_RQ_SECTORS
  29         ZFS_AC_KERNEL_GET_DISK_RO
  30         ZFS_AC_KERNEL_RQ_IS_SYNC
  31         ZFS_AC_KERNEL_RQ_FOR_EACH_SEGMENT
  32         ZFS_AC_KERNEL_CONST_XATTR_HANDLER
  33         ZFS_AC_KERNEL_XATTR_HANDLER_GET
  34         ZFS_AC_KERNEL_XATTR_HANDLER_SET
  35         ZFS_AC_KERNEL_FSYNC_2ARGS
  36         ZFS_AC_KERNEL_EVICT_INODE
  37         ZFS_AC_KERNEL_INSERT_INODE_LOCKED
  38         ZFS_AC_KERNEL_D_OBTAIN_ALIAS
  39         ZFS_AC_KERNEL_CHECK_DISK_SIZE_CHANGE
  40         ZFS_AC_KERNEL_TRUNCATE_SETSIZE
  41         ZFS_AC_KERNEL_6ARGS_SECURITY_INODE_INIT_SECURITY
  42         ZFS_AC_KERNEL_MOUNT_NODEV
  43
  44         if test "$LINUX_OBJ" != "$LINUX"; then
  45                 KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
  46         fi
  47         AC_SUBST(KERNELMAKE_PARAMS)
  48
  49
  50         dnl # -Wall -fno-strict-aliasing -Wstrict-prototypes and other
  51         dnl # compiler options are added by the kernel build system.
  52         KERNELCPPFLAGS="$KERNELCPPFLAGS $NO_UNUSED_BUT_SET_VARIABLE"
  53         KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
  54         KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""
  55
  56         AC_SUBST(KERNELCPPFLAGS)
  57 ])
  58
  59 dnl #
  60 dnl # Detect name used for Module.symvers file in kernel
  61 dnl #
  62 AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [
  63         modpost=$LINUX/scripts/Makefile.modpost
  64         AC_MSG_CHECKING([kernel file name for module symbols])
  65         if test -f "$modpost"; then
  66                 if grep -q Modules.symvers $modpost; then
  67                         LINUX_SYMBOLS=Modules.symvers
  68                 else
  69                         LINUX_SYMBOLS=Module.symvers
  70                 fi
  71
  72                 if ! test -f "$LINUX_OBJ/$LINUX_SYMBOLS"; then
  73                         AC_MSG_ERROR([
  74         *** Please make sure the kernel devel package for your distribution
  75         *** is installed.  If your building with a custom kernel make sure the
  76         *** kernel is configured, built, and the '--with-linux=PATH' configure
  77         *** option refers to the location of the kernel source.])
  78                 fi
  79         else
  80                 LINUX_SYMBOLS=NONE
  81         fi
  82         AC_MSG_RESULT($LINUX_SYMBOLS)
  83         AC_SUBST(LINUX_SYMBOLS)
  84 ])
  85
  86 dnl #
  87 dnl # Detect the kernel to be built against
  88 dnl #
  89 AC_DEFUN([ZFS_AC_KERNEL], [
  90         AC_ARG_WITH([linux],
  91                 AS_HELP_STRING([--with-linux=PATH],
  92                 [Path to kernel source]),
  93                 [kernelsrc="$withval"])
  94
  95         AC_ARG_WITH(linux-obj,
  96                 AS_HELP_STRING([--with-linux-obj=PATH],
  97                 [Path to kernel build objects]),
  98                 [kernelbuild="$withval"])
  99
 100         AC_MSG_CHECKING([kernel source directory])
 101         if test -z "$kernelsrc"; then
 102                 if test -e "/lib/modules/$(uname -r)/source"; then
 103                         headersdir="/lib/modules/$(uname -r)/source"
 104                         sourcelink=$(readlink -f "$headersdir")
 105                 elif test -e "/lib/modules/$(uname -r)/build"; then
 106                         headersdir="/lib/modules/$(uname -r)/build"
 107                         sourcelink=$(readlink -f "$headersdir")
 108                 else
 109                         sourcelink=$(ls -1d /usr/src/kernels/* \
 110                                      /usr/src/linux-* \
 111                                      2>/dev/null | grep -v obj | tail -1)
 112                 fi
 113
 114                 if test -n "$sourcelink" && test -e ${sourcelink}; then
 115                         kernelsrc=`readlink -f ${sourcelink}`
 116                 else
 117                         AC_MSG_RESULT([Not found])
 118                         AC_MSG_ERROR([
 119         *** Please make sure the kernel devel package for your distribution
 120         *** is installed then try again.  If that fails you can specify the
 121         *** location of the kernel source with the '--with-linux=PATH' option.])
 122                 fi
 123         else
 124                 if test "$kernelsrc" = "NONE"; then
 125                         kernsrcver=NONE
 126                 fi
 127         fi
 128
 129         AC_MSG_RESULT([$kernelsrc])
 130         AC_MSG_CHECKING([kernel build directory])
 131         if test -z "$kernelbuild"; then
 132                 if test -e "/lib/modules/$(uname -r)/build"; then
 133                         kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
 134                 elif test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
 135                         kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
 136                 elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
 137                         kernelbuild=${kernelsrc}-obj/${target_cpu}/default
 138                 elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
 139                         kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
 140                 else
 141                         kernelbuild=${kernelsrc}
 142                 fi
 143         fi
 144         AC_MSG_RESULT([$kernelbuild])
 145
 146         AC_MSG_CHECKING([kernel source version])
 147         utsrelease1=$kernelbuild/include/linux/version.h
 148         utsrelease2=$kernelbuild/include/linux/utsrelease.h
 149         utsrelease3=$kernelbuild/include/generated/utsrelease.h
 150         if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
 151                 utsrelease=linux/version.h
 152         elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
 153                 utsrelease=linux/utsrelease.h
 154         elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
 155                 utsrelease=generated/utsrelease.h
 156         fi
 157
 158         if test "$utsrelease"; then
 159                 kernsrcver=`(echo "#include <$utsrelease>";
 160                              echo "kernsrcver=UTS_RELEASE") |
 161                              cpp -I $kernelbuild/include |
 162                              grep "^kernsrcver=" | cut -d \" -f 2`
 163
 164                 if test -z "$kernsrcver"; then
 165                         AC_MSG_RESULT([Not found])
 166                         AC_MSG_ERROR([*** Cannot determine kernel version.])
 167                 fi
 168         else
 169                 AC_MSG_RESULT([Not found])
 170                 AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
 171         fi
 172
 173         AC_MSG_RESULT([$kernsrcver])
 174
 175         LINUX=${kernelsrc}
 176         LINUX_OBJ=${kernelbuild}
 177         LINUX_VERSION=${kernsrcver}
 178
 179         AC_SUBST(LINUX)
 180         AC_SUBST(LINUX_OBJ)
 181         AC_SUBST(LINUX_VERSION)
 182
 183         ZFS_AC_MODULE_SYMVERS
 184 ])
 185
 186 dnl #
 187 dnl # Detect name used for the additional SPL Module.symvers file.  If one
 188 dnl # does not exist this is likely because the SPL has been configured
 189 dnl # but not built.  To allow recursive builds a good guess is made as to
 190 dnl # what this file will be named based on what it is named in the kernel
 191 dnl # build products.  This file will first be used at link time so if
 192 dnl # the guess is wrong the build will fail then.  This unfortunately
 193 dnl # means the ZFS package does not contain a reliable mechanism to
 194 dnl # detect symbols exported by the SPL at configure time.
 195 dnl #
 196 AC_DEFUN([ZFS_AC_SPL_MODULE_SYMVERS], [
 197         AC_MSG_CHECKING([spl file name for module symbols])
 198         if test -r $SPL_OBJ/Module.symvers; then
 199                 SPL_SYMBOLS=Module.symvers
 200         elif test -r $SPL_OBJ/Modules.symvers; then
 201                 SPL_SYMBOLS=Modules.symvers
 202         elif test -r $SPL_OBJ/module/Module.symvers; then
 203                 SPL_SYMBOLS=Module.symvers
 204         elif test -r $SPL_OBJ/module/Modules.symvers; then
 205                 SPL_SYMBOLS=Modules.symvers
 206         else
 207                 SPL_SYMBOLS=$LINUX_SYMBOLS
 208         fi
 209
 210         AC_MSG_RESULT([$SPL_SYMBOLS])
 211         AC_SUBST(SPL_SYMBOLS)
 212 ])
 213
 214 dnl #
 215 dnl # Detect the SPL module to be built against
 216 dnl #
 217 AC_DEFUN([ZFS_AC_SPL], [
 218         AC_ARG_WITH([spl],
 219                 AS_HELP_STRING([--with-spl=PATH],
 220                 [Path to spl source]),
 221                 [splsrc="$withval"])
 222
 223         AC_ARG_WITH([spl-obj],
 224                 AS_HELP_STRING([--with-spl-obj=PATH],
 225                 [Path to spl build objects]),
 226                 [splbuild="$withval"])
 227
 228
 229         AC_MSG_CHECKING([spl source directory])
 230         if test -z "$splsrc"; then
 231                 sourcelink=`ls -1d /usr/src/spl-*/${LINUX_VERSION} \
 232                             2>/dev/null | tail -1`
 233
 234                 if test -z "$sourcelink" || test ! -e $sourcelink; then
 235                         sourcelink=../spl
 236                 fi
 237
 238                 if test -e $sourcelink; then
 239                         splsrc=`readlink -f ${sourcelink}`
 240                 else
 241                         AC_MSG_RESULT([Not found])
 242                         AC_MSG_ERROR([
 243         *** Please make sure the spl devel package for your distribution
 244         *** is installed then try again.  If that fails you can specify the
 245         *** location of the spl source with the '--with-spl=PATH' option.])
 246                 fi
 247         else
 248                 if test "$splsrc" = "NONE"; then
 249                         splbuild=NONE
 250                         splsrcver=NONE
 251                 fi
 252         fi
 253
 254         AC_MSG_RESULT([$splsrc])
 255         AC_MSG_CHECKING([spl build directory])
 256         if test -z "$splbuild"; then
 257                 splbuild=${splsrc}
 258         fi
 259         AC_MSG_RESULT([$splbuild])
 260
 261         AC_MSG_CHECKING([spl source version])
 262         if test -r $splbuild/spl_config.h &&
 263                 fgrep -q SPL_META_VERSION $splbuild/spl_config.h; then
 264
 265                 splsrcver=`(echo "#include <spl_config.h>";
 266                             echo "splsrcver=SPL_META_VERSION") |
 267                             cpp -I $splbuild |
 268                             grep "^splsrcver=" | cut -d \" -f 2`
 269         fi
 270
 271         if test -z "$splsrcver"; then
 272                 AC_MSG_RESULT([Not found])
 273                 AC_MSG_ERROR([
 274                 *** Cannot determine the version of the spl source.
 275                 *** Please prepare the spl source before running this script])
 276         fi
 277
 278         AC_MSG_RESULT([$splsrcver])
 279
 280         SPL=${splsrc}
 281         SPL_OBJ=${splbuild}
 282         SPL_VERSION=${splsrcver}
 283
 284         AC_SUBST(SPL)
 285         AC_SUBST(SPL_OBJ)
 286         AC_SUBST(SPL_VERSION)
 287
 288         ZFS_AC_SPL_MODULE_SYMVERS
 289 ])
 290
 291 dnl #
 292 dnl # Certain kernel build options are not supported.  These must be
 293 dnl # detected at configure time and cause a build failure.  Otherwise
 294 dnl # modules may be successfully built that behave incorrectly.
 295 dnl #
 296 dnl # CONFIG_PREEMPT - Preempt kernels require special handling.
 297 dnl #
 298 dnl # There are certain kernel build options which when enabled are
 299 dnl # completely incompatible with non GPL kernel modules.  It is best
 300 dnl # to detect these at configure time and fail with a clear error
 301 dnl # rather than build everything and fail during linking.
 302 dnl #
 303 dnl # CONFIG_DEBUG_LOCK_ALLOC - Maps mutex_lock() to mutex_lock_nested()
 304 dnl #
 305 AC_DEFUN([ZFS_AC_KERNEL_CONFIG], [
 306
 307         ZFS_LINUX_CONFIG([PREEMPT],
 308                 AC_MSG_ERROR([
 309                 *** Kernel built with CONFIG_PREEMPT which is not supported.
 310                 ** You must rebuild your kernel without this option.]), [])
 311
 312         if test "$ZFS_META_LICENSE" = CDDL; then
 313                 ZFS_LINUX_CONFIG([DEBUG_LOCK_ALLOC],
 314                 AC_MSG_ERROR([
 315                 *** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is
 316                 *** incompatible with the CDDL license.  You must rebuild
 317                 *** your kernel without this option.]), [])
 318         fi
 319
 320         if test "$ZFS_META_LICENSE" = GPL; then
 321                 AC_DEFINE([HAVE_GPL_ONLY_SYMBOLS], [1],
 322                         [Define to 1 if licensed under the GPL])
 323         fi
 324 ])
 325
 326 dnl #
 327 dnl # ZFS_LINUX_CONFTEST
 328 dnl #
 329 AC_DEFUN([ZFS_LINUX_CONFTEST], [
 330 cat confdefs.h - <<_ACEOF >conftest.c
 331 $1
 332 _ACEOF
 333 ])
 334
 335 dnl #
 336 dnl # ZFS_LANG_PROGRAM(C)([PROLOGUE], [BODY])
 337 dnl #
 338 m4_define([ZFS_LANG_PROGRAM], [
 339 $1
 340 int
 341 main (void)
 342 {
 343 dnl Do *not* indent the following line: there may be CPP directives.
 344 dnl Don't move the `;' right after for the same reason.
 345 $2
 346   ;
 347   return 0;
 348 }
 349 ])
 350
 351 dnl #
 352 dnl # ZFS_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
 353 dnl #
 354 AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
 355         m4_ifvaln([$1], [ZFS_LINUX_CONFTEST([$1])])
 356         rm -Rf build && mkdir -p build
 357         echo "obj-m := conftest.o" >build/Makefile
 358         AS_IF(
 359                 [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) >/dev/null && AC_TRY_COMMAND([$3])],
 360                 [$4],
 361                 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
 362         )
 363         rm -Rf build
 364 ])
 365
 366 dnl #
 367 dnl # ZFS_LINUX_TRY_COMPILE like AC_TRY_COMPILE
 368 dnl #
 369 AC_DEFUN([ZFS_LINUX_TRY_COMPILE],
 370         [ZFS_LINUX_COMPILE_IFELSE(
 371         [AC_LANG_SOURCE([ZFS_LANG_PROGRAM([[$1]], [[$2]])])],
 372         [modules],
 373         [test -s build/conftest.o],
 374         [$3], [$4])
 375 ])
 376
 377 dnl #
 378 dnl # ZFS_LINUX_CONFIG
 379 dnl #
 380 AC_DEFUN([ZFS_LINUX_CONFIG],
 381         [AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
 382         ZFS_LINUX_TRY_COMPILE([
 383                 #ifndef AUTOCONF_INCLUDED
 384                 #include <linux/config.h>
 385                 #endif
 386         ],[
 387                 #ifndef CONFIG_$1
 388                 #error CONFIG_$1 not #defined
 389                 #endif
 390         ],[
 391                 AC_MSG_RESULT([yes])
 392                 $2
 393         ],[
 394                 AC_MSG_RESULT([no])
 395                 $3
 396         ])
 397 ])
 398
 399 dnl #
 400 dnl # ZFS_CHECK_SYMBOL_EXPORT
 401 dnl # check symbol exported or not
 402 dnl #
 403 AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT],
 404         [AC_MSG_CHECKING([whether symbol $1 is exported])
 405         grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
 406                 $LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
 407         rc=$?
 408         if test $rc -ne 0; then
 409                 export=0
 410                 for file in $2; do
 411                         grep -q -E "EXPORT_SYMBOL.*($1)" "$LINUX/$file" 2>/dev/null
 412                         rc=$?
 413                         if test $rc -eq 0; then
 414                                 export=1
 415                                 break;
 416                         fi
 417                 done
 418                 if test $export -eq 0; then
 419                         AC_MSG_RESULT([no])
 420                         $4
 421                 else
 422                         AC_MSG_RESULT([yes])
 423                         $3
 424                 fi
 425         else
 426                 AC_MSG_RESULT([yes])
 427                 $3
 428         fi
 429 ])