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