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
40 ZFS_AC_KERNEL_TRUNCATE_SETSIZE
42 if test "$LINUX_OBJ" != "$LINUX"; then
43 KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
45 AC_SUBST(KERNELMAKE_PARAMS)
48 dnl # -Wall -fno-strict-aliasing -Wstrict-prototypes and other
49 dnl # compiler options are added by the kernel build system.
50 KERNELCPPFLAGS="$KERNELCPPFLAGS $NO_UNUSED_BUT_SET_VARIABLE"
51 KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
52 KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""
54 AC_SUBST(KERNELCPPFLAGS)
58 dnl # Detect name used for Module.symvers file in kernel
60 AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [
61 modpost=$LINUX/scripts/Makefile.modpost
62 AC_MSG_CHECKING([kernel file name for module symbols])
63 if test -f "$modpost"; then
64 if grep -q Modules.symvers $modpost; then
65 LINUX_SYMBOLS=Modules.symvers
67 LINUX_SYMBOLS=Module.symvers
70 if ! test -f "$LINUX_OBJ/$LINUX_SYMBOLS"; then
72 *** Please make sure the kernel devel package for your distribution
73 *** is installed. If your building with a custom kernel make sure the
74 *** kernel is configured, built, and the '--with-linux=PATH' configure
75 *** option refers to the location of the kernel source.])
80 AC_MSG_RESULT($LINUX_SYMBOLS)
81 AC_SUBST(LINUX_SYMBOLS)
85 dnl # Detect the kernel to be built against
87 AC_DEFUN([ZFS_AC_KERNEL], [
89 AS_HELP_STRING([--with-linux=PATH],
90 [Path to kernel source]),
91 [kernelsrc="$withval"])
93 AC_ARG_WITH(linux-obj,
94 AS_HELP_STRING([--with-linux-obj=PATH],
95 [Path to kernel build objects]),
96 [kernelbuild="$withval"])
98 AC_MSG_CHECKING([kernel source directory])
99 if test -z "$kernelsrc"; then
100 if test -e "/lib/modules/$(uname -r)/source"; then
101 headersdir="/lib/modules/$(uname -r)/source"
102 sourcelink=$(readlink -f "$headersdir")
103 elif test -e "/lib/modules/$(uname -r)/build"; then
104 headersdir="/lib/modules/$(uname -r)/build"
105 sourcelink=$(readlink -f "$headersdir")
107 sourcelink=$(ls -1d /usr/src/kernels/* \
109 2>/dev/null | grep -v obj | tail -1)
112 if test -n "$sourcelink" && test -e ${sourcelink}; then
113 kernelsrc=`readlink -f ${sourcelink}`
115 AC_MSG_RESULT([Not found])
117 *** Please make sure the kernel devel package for your distribution
118 *** is installed then try again. If that fails you can specify the
119 *** location of the kernel source with the '--with-linux=PATH' option.])
122 if test "$kernelsrc" = "NONE"; then
127 AC_MSG_RESULT([$kernelsrc])
128 AC_MSG_CHECKING([kernel build directory])
129 if test -z "$kernelbuild"; then
130 if test -e "/lib/modules/$(uname -r)/build"; then
131 kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
132 elif test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}; then
133 kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
134 elif test -d ${kernelsrc}-obj/${target_cpu}/default; then
135 kernelbuild=${kernelsrc}-obj/${target_cpu}/default
136 elif test -d `dirname ${kernelsrc}`/build-${target_cpu}; then
137 kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
139 kernelbuild=${kernelsrc}
142 AC_MSG_RESULT([$kernelbuild])
144 AC_MSG_CHECKING([kernel source version])
145 utsrelease1=$kernelbuild/include/linux/version.h
146 utsrelease2=$kernelbuild/include/linux/utsrelease.h
147 utsrelease3=$kernelbuild/include/generated/utsrelease.h
148 if test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1; then
149 utsrelease=linux/version.h
150 elif test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2; then
151 utsrelease=linux/utsrelease.h
152 elif test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3; then
153 utsrelease=generated/utsrelease.h
156 if test "$utsrelease"; then
157 kernsrcver=`(echo "#include <$utsrelease>";
158 echo "kernsrcver=UTS_RELEASE") |
159 cpp -I $kernelbuild/include |
160 grep "^kernsrcver=" | cut -d \" -f 2`
162 if test -z "$kernsrcver"; then
163 AC_MSG_RESULT([Not found])
164 AC_MSG_ERROR([*** Cannot determine kernel version.])
167 AC_MSG_RESULT([Not found])
168 AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
171 AC_MSG_RESULT([$kernsrcver])
174 LINUX_OBJ=${kernelbuild}
175 LINUX_VERSION=${kernsrcver}
179 AC_SUBST(LINUX_VERSION)
181 ZFS_AC_MODULE_SYMVERS
185 dnl # Detect name used for the additional SPL Module.symvers file. If one
186 dnl # does not exist this is likely because the SPL has been configured
187 dnl # but not built. To allow recursive builds a good guess is made as to
188 dnl # what this file will be named based on what it is named in the kernel
189 dnl # build products. This file will first be used at link time so if
190 dnl # the guess is wrong the build will fail then. This unfortunately
191 dnl # means the ZFS package does not contain a reliable mechanism to
192 dnl # detect symbols exported by the SPL at configure time.
194 AC_DEFUN([ZFS_AC_SPL_MODULE_SYMVERS], [
195 AC_MSG_CHECKING([spl file name for module symbols])
196 if test -r $SPL_OBJ/Module.symvers; then
197 SPL_SYMBOLS=Module.symvers
198 elif test -r $SPL_OBJ/Modules.symvers; then
199 SPL_SYMBOLS=Modules.symvers
200 elif test -r $SPL_OBJ/module/Module.symvers; then
201 SPL_SYMBOLS=Module.symvers
202 elif test -r $SPL_OBJ/module/Modules.symvers; then
203 SPL_SYMBOLS=Modules.symvers
205 SPL_SYMBOLS=$LINUX_SYMBOLS
208 AC_MSG_RESULT([$SPL_SYMBOLS])
209 AC_SUBST(SPL_SYMBOLS)
213 dnl # Detect the SPL module to be built against
215 AC_DEFUN([ZFS_AC_SPL], [
217 AS_HELP_STRING([--with-spl=PATH],
218 [Path to spl source]),
221 AC_ARG_WITH([spl-obj],
222 AS_HELP_STRING([--with-spl-obj=PATH],
223 [Path to spl build objects]),
224 [splbuild="$withval"])
227 AC_MSG_CHECKING([spl source directory])
228 if test -z "$splsrc"; then
229 sourcelink=`ls -1d /usr/src/spl-*/${LINUX_VERSION} \
230 2>/dev/null | tail -1`
232 if test -z "$sourcelink" || test ! -e $sourcelink; then
236 if test -e $sourcelink; then
237 splsrc=`readlink -f ${sourcelink}`
239 AC_MSG_RESULT([Not found])
241 *** Please make sure the spl devel package for your distribution
242 *** is installed then try again. If that fails you can specify the
243 *** location of the spl source with the '--with-spl=PATH' option.])
246 if test "$splsrc" = "NONE"; then
252 AC_MSG_RESULT([$splsrc])
253 AC_MSG_CHECKING([spl build directory])
254 if test -z "$splbuild"; then
257 AC_MSG_RESULT([$splbuild])
259 AC_MSG_CHECKING([spl source version])
260 if test -r $splbuild/spl_config.h &&
261 fgrep -q SPL_META_VERSION $splbuild/spl_config.h; then
263 splsrcver=`(echo "#include <spl_config.h>";
264 echo "splsrcver=SPL_META_VERSION") |
266 grep "^splsrcver=" | cut -d \" -f 2`
269 if test -z "$splsrcver"; then
270 AC_MSG_RESULT([Not found])
272 *** Cannot determine the version of the spl source.
273 *** Please prepare the spl source before running this script])
276 AC_MSG_RESULT([$splsrcver])
280 SPL_VERSION=${splsrcver}
284 AC_SUBST(SPL_VERSION)
286 ZFS_AC_SPL_MODULE_SYMVERS
290 dnl # Certain kernel build options are not supported. These must be
291 dnl # detected at configure time and cause a build failure. Otherwise
292 dnl # modules may be successfully built that behave incorrectly.
294 dnl # CONFIG_PREEMPT - Preempt kernels require special handling.
296 dnl # There are certain kernel build options which when enabled are
297 dnl # completely incompatible with non GPL kernel modules. It is best
298 dnl # to detect these at configure time and fail with a clear error
299 dnl # rather than build everything and fail during linking.
301 dnl # CONFIG_DEBUG_LOCK_ALLOC - Maps mutex_lock() to mutex_lock_nested()
303 AC_DEFUN([ZFS_AC_KERNEL_CONFIG], [
305 ZFS_LINUX_CONFIG([PREEMPT],
307 *** Kernel built with CONFIG_PREEMPT which is not supported.
308 ** You must rebuild your kernel without this option.]), [])
310 if test "$ZFS_META_LICENSE" = CDDL; then
311 ZFS_LINUX_CONFIG([DEBUG_LOCK_ALLOC],
313 *** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is
314 *** incompatible with the CDDL license. You must rebuild
315 *** your kernel without this option.]), [])
318 if test "$ZFS_META_LICENSE" = GPL; then
319 AC_DEFINE([HAVE_GPL_ONLY_SYMBOLS], [1],
320 [Define to 1 if licensed under the GPL])
325 dnl # ZFS_LINUX_CONFTEST
327 AC_DEFUN([ZFS_LINUX_CONFTEST], [
328 cat confdefs.h - <<_ACEOF >conftest.c
334 dnl # ZFS_LANG_PROGRAM(C)([PROLOGUE], [BODY])
336 m4_define([ZFS_LANG_PROGRAM], [
341 dnl Do *not* indent the following line: there may be CPP directives.
342 dnl Don't move the `;' right after for the same reason.
350 dnl # ZFS_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
352 AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
353 m4_ifvaln([$1], [ZFS_LINUX_CONFTEST([$1])])
354 rm -Rf build && mkdir -p build
355 echo "obj-m := conftest.o" >build/Makefile
357 [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])],
359 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
365 dnl # ZFS_LINUX_TRY_COMPILE like AC_TRY_COMPILE
367 AC_DEFUN([ZFS_LINUX_TRY_COMPILE],
368 [ZFS_LINUX_COMPILE_IFELSE(
369 [AC_LANG_SOURCE([ZFS_LANG_PROGRAM([[$1]], [[$2]])])],
371 [test -s build/conftest.o],
376 dnl # ZFS_LINUX_CONFIG
378 AC_DEFUN([ZFS_LINUX_CONFIG],
379 [AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
380 ZFS_LINUX_TRY_COMPILE([
381 #ifndef AUTOCONF_INCLUDED
382 #include <linux/config.h>
386 #error CONFIG_$1 not #defined
398 dnl # ZFS_CHECK_SYMBOL_EXPORT
399 dnl # check symbol exported or not
401 AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT],
402 [AC_MSG_CHECKING([whether symbol $1 is exported])
403 grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
404 $LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
406 if test $rc -ne 0; then
409 grep -q -E "EXPORT_SYMBOL.*($1)" "$LINUX/$file" 2>/dev/null
411 if test $rc -eq 0; then
416 if test $export -eq 0; then