2 dnl # Default ZFS kernel configuration
4 AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
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
41 if test "$LINUX_OBJ" != "$LINUX"; then
42 KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
44 AC_SUBST(KERNELMAKE_PARAMS)
47 dnl # -Wall -fno-strict-aliasing -Wstrict-prototypes and other
48 dnl # compiler options are added by the kernel build system.
49 KERNELCPPFLAGS="$KERNELCPPFLAGS $NO_UNUSED_BUT_SET_VARIABLE"
50 KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
51 KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""
53 AC_SUBST(KERNELCPPFLAGS)
57 dnl # Detect name used for Module.symvers file in kernel
59 AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [
60 modpost=$LINUX/scripts/Makefile.modpost
61 AC_MSG_CHECKING([kernel file name for module symbols])
62 if test -f "$modpost"; then
63 if grep -q Modules.symvers $modpost; then
64 LINUX_SYMBOLS=Modules.symvers
66 LINUX_SYMBOLS=Module.symvers
69 if ! test -f "$LINUX_OBJ/$LINUX_SYMBOLS"; then
71 *** Please make sure the kernel devel package for your distribution
72 *** is installed. If your building with a custom kernel make sure the
73 *** kernel is configured, built, and the '--with-linux=PATH' configure
74 *** option refers to the location of the kernel source.])
79 AC_MSG_RESULT($LINUX_SYMBOLS)
80 AC_SUBST(LINUX_SYMBOLS)
84 dnl # Detect the kernel to be built against
86 AC_DEFUN([ZFS_AC_KERNEL], [
88 AS_HELP_STRING([--with-linux=PATH],
89 [Path to kernel source]),
90 [kernelsrc="$withval"])
92 AC_ARG_WITH(linux-obj,
93 AS_HELP_STRING([--with-linux-obj=PATH],
94 [Path to kernel build objects]),
95 [kernelbuild="$withval"])
97 AC_MSG_CHECKING([kernel source directory])
98 if test -z "$kernelsrc"; then
99 if test -e "/lib/modules/$(uname -r)/source"; then
100 headersdir="/lib/modules/$(uname -r)/source"
101 sourcelink=$(readlink -f "$headersdir")
102 elif test -e "/lib/modules/$(uname -r)/build"; then
103 headersdir="/lib/modules/$(uname -r)/build"
104 sourcelink=$(readlink -f "$headersdir")
106 sourcelink=$(ls -1d /usr/src/kernels/* \
108 2>/dev/null | grep -v obj | tail -1)
111 if test -n "$sourcelink" && test -e ${sourcelink}; then
112 kernelsrc=`readlink -f ${sourcelink}`
114 AC_MSG_RESULT([Not found])
116 *** Please make sure the kernel devel package for your distribution
117 *** is installed then try again. If that fails you can specify the
118 *** location of the kernel source with the '--with-linux=PATH' option.])
121 if test "$kernelsrc" = "NONE"; then
126 AC_MSG_RESULT([$kernelsrc])
127 AC_MSG_CHECKING([kernel build directory])
128 if test -z "$kernelbuild"; then
129 if test -e "/lib/modules/$(uname -r)/build"; then
130 kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
131 elif test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
132 kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
133 elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
134 kernelbuild=${kernelsrc}-obj/${target_cpu}/default
135 elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
136 kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
138 kernelbuild=${kernelsrc}
141 AC_MSG_RESULT([$kernelbuild])
143 AC_MSG_CHECKING([kernel source version])
144 utsrelease1=$kernelbuild/include/linux/version.h
145 utsrelease2=$kernelbuild/include/linux/utsrelease.h
146 utsrelease3=$kernelbuild/include/generated/utsrelease.h
147 if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
148 utsrelease=linux/version.h
149 elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
150 utsrelease=linux/utsrelease.h
151 elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
152 utsrelease=generated/utsrelease.h
155 if test "$utsrelease"; then
156 kernsrcver=`(echo "#include <$utsrelease>";
157 echo "kernsrcver=UTS_RELEASE") |
158 cpp -I $kernelbuild/include |
159 grep "^kernsrcver=" | cut -d \" -f 2`
161 if test -z "$kernsrcver"; then
162 AC_MSG_RESULT([Not found])
163 AC_MSG_ERROR([*** Cannot determine kernel version.])
166 AC_MSG_RESULT([Not found])
167 AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
170 AC_MSG_RESULT([$kernsrcver])
173 LINUX_OBJ=${kernelbuild}
174 LINUX_VERSION=${kernsrcver}
178 AC_SUBST(LINUX_VERSION)
180 ZFS_AC_MODULE_SYMVERS
184 dnl # Detect name used for the additional SPL Module.symvers file. If one
185 dnl # does not exist this is likely because the SPL has been configured
186 dnl # but not built. To allow recursive builds a good guess is made as to
187 dnl # what this file will be named based on what it is named in the kernel
188 dnl # build products. This file will first be used at link time so if
189 dnl # the guess is wrong the build will fail then. This unfortunately
190 dnl # means the ZFS package does not contain a reliable mechanism to
191 dnl # detect symbols exported by the SPL at configure time.
193 AC_DEFUN([ZFS_AC_SPL_MODULE_SYMVERS], [
194 AC_MSG_CHECKING([spl file name for module symbols])
195 if test -r $SPL_OBJ/Module.symvers; then
196 SPL_SYMBOLS=Module.symvers
197 elif test -r $SPL_OBJ/Modules.symvers; then
198 SPL_SYMBOLS=Modules.symvers
199 elif test -r $SPL_OBJ/module/Module.symvers; then
200 SPL_SYMBOLS=Module.symvers
201 elif test -r $SPL_OBJ/module/Modules.symvers; then
202 SPL_SYMBOLS=Modules.symvers
204 SPL_SYMBOLS=$LINUX_SYMBOLS
207 AC_MSG_RESULT([$SPL_SYMBOLS])
208 AC_SUBST(SPL_SYMBOLS)
212 dnl # Detect the SPL module to be built against
214 AC_DEFUN([ZFS_AC_SPL], [
216 AS_HELP_STRING([--with-spl=PATH],
217 [Path to spl source]),
220 AC_ARG_WITH([spl-obj],
221 AS_HELP_STRING([--with-spl-obj=PATH],
222 [Path to spl build objects]),
223 [splbuild="$withval"])
226 AC_MSG_CHECKING([spl source directory])
227 if test -z "$splsrc"; then
228 sourcelink=`ls -1d /usr/src/spl-*/${LINUX_VERSION} \
229 2>/dev/null | tail -1`
231 if test -z "$sourcelink" || test ! -e $sourcelink; then
235 if test -e $sourcelink; then
236 splsrc=`readlink -f ${sourcelink}`
238 AC_MSG_RESULT([Not found])
240 *** Please make sure the spl devel package for your distribution
241 *** is installed then try again. If that fails you can specify the
242 *** location of the spl source with the '--with-spl=PATH' option.])
245 if test "$splsrc" = "NONE"; then
251 AC_MSG_RESULT([$splsrc])
252 AC_MSG_CHECKING([spl build directory])
253 if test -z "$splbuild"; then
256 AC_MSG_RESULT([$splbuild])
258 AC_MSG_CHECKING([spl source version])
259 if test -r $splbuild/spl_config.h &&
260 fgrep -q SPL_META_VERSION $splbuild/spl_config.h; then
262 splsrcver=`(echo "#include <spl_config.h>";
263 echo "splsrcver=SPL_META_VERSION") |
265 grep "^splsrcver=" | cut -d \" -f 2`
268 if test -z "$splsrcver"; then
269 AC_MSG_RESULT([Not found])
271 *** Cannot determine the version of the spl source.
272 *** Please prepare the spl source before running this script])
275 AC_MSG_RESULT([$splsrcver])
279 SPL_VERSION=${splsrcver}
283 AC_SUBST(SPL_VERSION)
285 ZFS_AC_SPL_MODULE_SYMVERS
289 dnl # Certain kernel build options are not supported. These must be
290 dnl # detected at configure time and cause a build failure. Otherwise
291 dnl # modules may be successfully built that behave incorrectly.
293 dnl # CONFIG_PREEMPT - Preempt kernels require special handling.
295 dnl # There are certain kernel build options which when enabled are
296 dnl # completely incompatible with non GPL kernel modules. It is best
297 dnl # to detect these at configure time and fail with a clear error
298 dnl # rather than build everything and fail during linking.
300 dnl # CONFIG_DEBUG_LOCK_ALLOC - Maps mutex_lock() to mutex_lock_nested()
302 AC_DEFUN([ZFS_AC_KERNEL_CONFIG], [
304 ZFS_LINUX_CONFIG([PREEMPT],
306 *** Kernel built with CONFIG_PREEMPT which is not supported.
307 ** You must rebuild your kernel without this option.]), [])
309 if test "$ZFS_META_LICENSE" = CDDL; then
310 ZFS_LINUX_CONFIG([DEBUG_LOCK_ALLOC],
312 *** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is
313 *** incompatible with the CDDL license. You must rebuild
314 *** your kernel without this option.]), [])
317 if test "$ZFS_META_LICENSE" = GPL; then
318 AC_DEFINE([HAVE_GPL_ONLY_SYMBOLS], [1],
319 [Define to 1 if licensed under the GPL])
324 dnl # ZFS_LINUX_CONFTEST
326 AC_DEFUN([ZFS_LINUX_CONFTEST], [
327 cat confdefs.h - <<_ACEOF >conftest.c
333 dnl # ZFS_LANG_PROGRAM(C)([PROLOGUE], [BODY])
335 m4_define([ZFS_LANG_PROGRAM], [
340 dnl Do *not* indent the following line: there may be CPP directives.
341 dnl Don't move the `;' right after for the same reason.
349 dnl # ZFS_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
351 AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
352 m4_ifvaln([$1], [ZFS_LINUX_CONFTEST([$1])])
353 rm -Rf build && mkdir -p build
354 echo "obj-m := conftest.o" >build/Makefile
356 [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])],
358 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
364 dnl # ZFS_LINUX_TRY_COMPILE like AC_TRY_COMPILE
366 AC_DEFUN([ZFS_LINUX_TRY_COMPILE],
367 [ZFS_LINUX_COMPILE_IFELSE(
368 [AC_LANG_SOURCE([ZFS_LANG_PROGRAM([[$1]], [[$2]])])],
370 [test -s build/conftest.o],
375 dnl # ZFS_LINUX_CONFIG
377 AC_DEFUN([ZFS_LINUX_CONFIG],
378 [AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
379 ZFS_LINUX_TRY_COMPILE([
380 #ifndef AUTOCONF_INCLUDED
381 #include <linux/config.h>
385 #error CONFIG_$1 not #defined
397 dnl # ZFS_CHECK_SYMBOL_EXPORT
398 dnl # check symbol exported or not
400 AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT],
401 [AC_MSG_CHECKING([whether symbol $1 is exported])
402 grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
403 $LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
405 if test $rc -ne 0; then
408 grep -q -E "EXPORT_SYMBOL.*($1)" "$LINUX/$file" 2>/dev/null
410 if test $rc -eq 0; then
415 if test $export -eq 0; then