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
38 if test "$LINUX_OBJ" != "$LINUX"; then
39 KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
41 AC_SUBST(KERNELMAKE_PARAMS)
44 dnl # -Wall -fno-strict-aliasing -Wstrict-prototypes and other
45 dnl # compiler options are added by the kernel build system.
46 KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
47 KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""
49 AC_SUBST(KERNELCPPFLAGS)
53 dnl # Detect name used for Module.symvers file in kernel
55 AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [
56 modpost=$LINUX/scripts/Makefile.modpost
57 AC_MSG_CHECKING([kernel file name for module symbols])
58 if test -f "$modpost"; then
59 if grep -q Modules.symvers $modpost; then
60 LINUX_SYMBOLS=Modules.symvers
62 LINUX_SYMBOLS=Module.symvers
67 AC_MSG_RESULT($LINUX_SYMBOLS)
68 AC_SUBST(LINUX_SYMBOLS)
72 dnl # Detect the kernel to be built against
74 AC_DEFUN([ZFS_AC_KERNEL], [
76 AS_HELP_STRING([--with-linux=PATH],
77 [Path to kernel source]),
78 [kernelsrc="$withval"])
80 AC_ARG_WITH(linux-obj,
81 AS_HELP_STRING([--with-linux-obj=PATH],
82 [Path to kernel build objects]),
83 [kernelbuild="$withval"])
85 AC_MSG_CHECKING([kernel source directory])
86 if test -z "$kernelsrc"; then
87 if test -e "/lib/modules/$(uname -r)/source"; then
88 headersdir="/lib/modules/$(uname -r)/source"
89 sourcelink=$(readlink -f "$headersdir")
90 elif test -e "/lib/modules/$(uname -r)/build"; then
91 headersdir="/lib/modules/$(uname -r)/build"
92 sourcelink=$(readlink -f "$headersdir")
94 sourcelink=$(ls -1d /usr/src/kernels/* \
96 2>/dev/null | grep -v obj | tail -1)
99 if test -n "$sourcelink" && test -e ${sourcelink}; then
100 kernelsrc=`readlink -f ${sourcelink}`
102 AC_MSG_RESULT([Not found])
104 *** Please make sure the kernel devel package for your distribution
105 *** is installed then try again. If that fails you can specify the
106 *** location of the kernel source with the '--with-linux=PATH' option.])
109 if test "$kernelsrc" = "NONE"; then
114 AC_MSG_RESULT([$kernelsrc])
115 AC_MSG_CHECKING([kernel build directory])
116 if test -z "$kernelbuild"; then
117 if test -e "/lib/modules/$(uname -r)/build"; then
118 kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
119 elif test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
120 kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
121 elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
122 kernelbuild=${kernelsrc}-obj/${target_cpu}/default
123 elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
124 kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
126 kernelbuild=${kernelsrc}
129 AC_MSG_RESULT([$kernelbuild])
131 AC_MSG_CHECKING([kernel source version])
132 utsrelease1=$kernelbuild/include/linux/version.h
133 utsrelease2=$kernelbuild/include/linux/utsrelease.h
134 utsrelease3=$kernelbuild/include/generated/utsrelease.h
135 if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
136 utsrelease=linux/version.h
137 elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
138 utsrelease=linux/utsrelease.h
139 elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
140 utsrelease=generated/utsrelease.h
143 if test "$utsrelease"; then
144 kernsrcver=`(echo "#include <$utsrelease>";
145 echo "kernsrcver=UTS_RELEASE") |
146 cpp -I $kernelbuild/include |
147 grep "^kernsrcver=" | cut -d \" -f 2`
149 if test -z "$kernsrcver"; then
150 AC_MSG_RESULT([Not found])
151 AC_MSG_ERROR([*** Cannot determine kernel version.])
154 AC_MSG_RESULT([Not found])
155 AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
158 AC_MSG_RESULT([$kernsrcver])
161 LINUX_OBJ=${kernelbuild}
162 LINUX_VERSION=${kernsrcver}
166 AC_SUBST(LINUX_VERSION)
168 ZFS_AC_MODULE_SYMVERS
172 dnl # Detect name used for the additional SPL Module.symvers file. If one
173 dnl # does not exist this is likely because the SPL has been configured
174 dnl # but not built. To allow recursive builds a good guess is made as to
175 dnl # what this file will be named based on what it is named in the kernel
176 dnl # build products. This file will first be used at link time so if
177 dnl # the guess is wrong the build will fail then. This unfortunately
178 dnl # means the ZFS package does not contain a reliable mechanism to
179 dnl # detect symbols exported by the SPL at configure time.
181 AC_DEFUN([ZFS_AC_SPL_MODULE_SYMVERS], [
182 AC_MSG_CHECKING([spl file name for module symbols])
183 if test -r $SPL_OBJ/Module.symvers; then
184 SPL_SYMBOLS=Module.symvers
185 elif test -r $SPL_OBJ/Modules.symvers; then
186 SPL_SYMBOLS=Modules.symvers
187 elif test -r $SPL_OBJ/module/Module.symvers; then
188 SPL_SYMBOLS=Module.symvers
189 elif test -r $SPL_OBJ/module/Modules.symvers; then
190 SPL_SYMBOLS=Modules.symvers
192 SPL_SYMBOLS=$LINUX_SYMBOLS
195 AC_MSG_RESULT([$SPL_SYMBOLS])
196 AC_SUBST(SPL_SYMBOLS)
200 dnl # Detect the SPL module to be built against
202 AC_DEFUN([ZFS_AC_SPL], [
204 AS_HELP_STRING([--with-spl=PATH],
205 [Path to spl source]),
208 AC_ARG_WITH([spl-obj],
209 AS_HELP_STRING([--with-spl-obj=PATH],
210 [Path to spl build objects]),
211 [splbuild="$withval"])
214 AC_MSG_CHECKING([spl source directory])
215 if test -z "$splsrc"; then
216 sourcelink=`ls -1d /usr/src/spl-*/${LINUX_VERSION} \
217 2>/dev/null | tail -1`
219 if test -z "$sourcelink" || test ! -e $sourcelink; then
223 if test -e $sourcelink; then
224 splsrc=`readlink -f ${sourcelink}`
226 AC_MSG_RESULT([Not found])
228 *** Please make sure the spl devel package for your distribution
229 *** is installed then try again. If that fails you can specify the
230 *** location of the spl source with the '--with-spl=PATH' option.])
233 if test "$splsrc" = "NONE"; then
239 AC_MSG_RESULT([$splsrc])
240 AC_MSG_CHECKING([spl build directory])
241 if test -z "$splbuild"; then
244 AC_MSG_RESULT([$splbuild])
246 AC_MSG_CHECKING([spl source version])
247 if test -r $splbuild/spl_config.h &&
248 fgrep -q SPL_META_VERSION $splbuild/spl_config.h; then
250 splsrcver=`(echo "#include <spl_config.h>";
251 echo "splsrcver=SPL_META_VERSION") |
253 grep "^splsrcver=" | cut -d \" -f 2`
256 if test -z "$splsrcver"; then
257 AC_MSG_RESULT([Not found])
259 *** Cannot determine the version of the spl source.
260 *** Please prepare the spl source before running this script])
263 AC_MSG_RESULT([$splsrcver])
267 SPL_VERSION=${splsrcver}
271 AC_SUBST(SPL_VERSION)
273 ZFS_AC_SPL_MODULE_SYMVERS
277 dnl # There are certain kernel build options which when enabled are
278 dnl # completely incompatible with non GPL kernel modules. It is best
279 dnl # to detect these at configure time and fail with a clear error
280 dnl # rather than build everything and fail during linking.
282 dnl # CONFIG_DEBUG_LOCK_ALLOC - Maps mutex_lock() to mutex_lock_nested()
284 AC_DEFUN([ZFS_AC_KERNEL_CONFIG], [
286 if test "$ZFS_META_LICENSE" = CDDL; then
287 ZFS_LINUX_CONFIG([DEBUG_LOCK_ALLOC],
289 *** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is
290 *** incompatible with the CDDL license. You must rebuild
291 *** your kernel without this option.]), [])
294 if test "$ZFS_META_LICENSE" = GPL; then
295 AC_DEFINE([HAVE_GPL_ONLY_SYMBOLS], [1],
296 [Define to 1 if licensed under the GPL])
301 dnl # ZFS_LINUX_CONFTEST
303 AC_DEFUN([ZFS_LINUX_CONFTEST], [
304 cat confdefs.h - <<_ACEOF >conftest.c
310 dnl # ZFS_LANG_PROGRAM(C)([PROLOGUE], [BODY])
312 m4_define([ZFS_LANG_PROGRAM], [
317 dnl Do *not* indent the following line: there may be CPP directives.
318 dnl Don't move the `;' right after for the same reason.
326 dnl # ZFS_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
328 AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
329 m4_ifvaln([$1], [ZFS_LINUX_CONFTEST([$1])])
330 rm -Rf build && mkdir -p build
331 echo "obj-m := conftest.o" >build/Makefile
333 [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])],
335 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
341 dnl # ZFS_LINUX_TRY_COMPILE like AC_TRY_COMPILE
343 AC_DEFUN([ZFS_LINUX_TRY_COMPILE],
344 [ZFS_LINUX_COMPILE_IFELSE(
345 [AC_LANG_SOURCE([ZFS_LANG_PROGRAM([[$1]], [[$2]])])],
347 [test -s build/conftest.o],
352 dnl # ZFS_LINUX_CONFIG
354 AC_DEFUN([ZFS_LINUX_CONFIG],
355 [AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
356 ZFS_LINUX_TRY_COMPILE([
357 #ifndef AUTOCONF_INCLUDED
358 #include <linux/config.h>
362 #error CONFIG_$1 not #defined
374 dnl # ZFS_CHECK_SYMBOL_EXPORT
375 dnl # check symbol exported or not
377 AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT],
378 [AC_MSG_CHECKING([whether symbol $1 is exported])
379 grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
380 $LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
382 if test $rc -ne 0; then
385 grep -q -E "EXPORT_SYMBOL.*($1)" "$LINUX/$file" 2>/dev/null
387 if test $rc -eq 0; then
392 if test $export -eq 0; then