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_3ARG_BLKDEV_GET
12 ZFS_AC_KERNEL_BLKDEV_GET_BY_PATH
13 ZFS_AC_KERNEL_OPEN_BDEV_EXCLUSIVE
14 ZFS_AC_KERNEL_INVALIDATE_BDEV_ARGS
15 ZFS_AC_KERNEL_BDEV_LOGICAL_BLOCK_SIZE
16 ZFS_AC_KERNEL_BIO_EMPTY_BARRIER
17 ZFS_AC_KERNEL_BIO_FAILFAST
18 ZFS_AC_KERNEL_BIO_FAILFAST_DTD
19 ZFS_AC_KERNEL_REQ_FAILFAST_MASK
20 ZFS_AC_KERNEL_BIO_END_IO_T_ARGS
21 ZFS_AC_KERNEL_BIO_RW_SYNC
22 ZFS_AC_KERNEL_BIO_RW_SYNCIO
23 ZFS_AC_KERNEL_REQ_SYNC
24 ZFS_AC_KERNEL_BLK_END_REQUEST
25 ZFS_AC_KERNEL_BLK_QUEUE_FLUSH
26 ZFS_AC_KERNEL_BLK_QUEUE_MAX_HW_SECTORS
27 ZFS_AC_KERNEL_BLK_QUEUE_MAX_SEGMENTS
28 ZFS_AC_KERNEL_BLK_QUEUE_PHYSICAL_BLOCK_SIZE
29 ZFS_AC_KERNEL_BLK_QUEUE_IO_OPT
30 ZFS_AC_KERNEL_BLK_QUEUE_NONROT
31 ZFS_AC_KERNEL_BLK_QUEUE_DISCARD
32 ZFS_AC_KERNEL_BLK_FETCH_REQUEST
33 ZFS_AC_KERNEL_BLK_REQUEUE_REQUEST
34 ZFS_AC_KERNEL_BLK_RQ_BYTES
35 ZFS_AC_KERNEL_BLK_RQ_POS
36 ZFS_AC_KERNEL_BLK_RQ_SECTORS
37 ZFS_AC_KERNEL_GET_DISK_RO
38 ZFS_AC_KERNEL_GET_GENDISK
39 ZFS_AC_KERNEL_RQ_IS_SYNC
40 ZFS_AC_KERNEL_RQ_FOR_EACH_SEGMENT
41 ZFS_AC_KERNEL_CONST_XATTR_HANDLER
42 ZFS_AC_KERNEL_XATTR_HANDLER_GET
43 ZFS_AC_KERNEL_XATTR_HANDLER_SET
44 ZFS_AC_KERNEL_SHOW_OPTIONS
46 ZFS_AC_KERNEL_EVICT_INODE
47 ZFS_AC_KERNEL_NR_CACHED_OBJECTS
48 ZFS_AC_KERNEL_FREE_CACHED_OBJECTS
49 ZFS_AC_KERNEL_FALLOCATE
50 ZFS_AC_KERNEL_TRUNCATE_RANGE
51 ZFS_AC_KERNEL_CREATE_UMODE_T
52 ZFS_AC_KERNEL_AUTOMOUNT
53 ZFS_AC_KERNEL_ENCODE_FH_WITH_INODE
54 ZFS_AC_KERNEL_INSERT_INODE_LOCKED
55 ZFS_AC_KERNEL_D_MAKE_ROOT
56 ZFS_AC_KERNEL_D_OBTAIN_ALIAS
57 ZFS_AC_KERNEL_CHECK_DISK_SIZE_CHANGE
58 ZFS_AC_KERNEL_TRUNCATE_SETSIZE
59 ZFS_AC_KERNEL_6ARGS_SECURITY_INODE_INIT_SECURITY
60 ZFS_AC_KERNEL_CALLBACK_SECURITY_INODE_INIT_SECURITY
61 ZFS_AC_KERNEL_MOUNT_NODEV
64 ZFS_AC_KERNEL_BDI_SETUP_AND_REGISTER
65 ZFS_AC_KERNEL_SET_NLINK
67 AS_IF([test "$LINUX_OBJ" != "$LINUX"], [
68 KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
70 AC_SUBST(KERNELMAKE_PARAMS)
73 dnl # -Wall -fno-strict-aliasing -Wstrict-prototypes and other
74 dnl # compiler options are added by the kernel build system.
75 KERNELCPPFLAGS="$KERNELCPPFLAGS $NO_UNUSED_BUT_SET_VARIABLE"
76 KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
77 KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""
79 AC_SUBST(KERNELCPPFLAGS)
83 dnl # Detect name used for Module.symvers file in kernel
85 AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [
86 modpost=$LINUX/scripts/Makefile.modpost
87 AC_MSG_CHECKING([kernel file name for module symbols])
88 AS_IF([test -f "$modpost"], [
89 AS_IF([grep -q Modules.symvers $modpost], [
90 LINUX_SYMBOLS=Modules.symvers
92 LINUX_SYMBOLS=Module.symvers
95 AS_IF([test ! -f "$LINUX_OBJ/$LINUX_SYMBOLS"], [
97 *** Please make sure the kernel devel package for your distribution
98 *** is installed. If your building with a custom kernel make sure the
99 *** kernel is configured, built, and the '--with-linux=PATH' configure
100 *** option refers to the location of the kernel source.])
105 AC_MSG_RESULT($LINUX_SYMBOLS)
106 AC_SUBST(LINUX_SYMBOLS)
110 dnl # Detect the kernel to be built against
112 AC_DEFUN([ZFS_AC_KERNEL], [
114 AS_HELP_STRING([--with-linux=PATH],
115 [Path to kernel source]),
116 [kernelsrc="$withval"])
118 AC_ARG_WITH(linux-obj,
119 AS_HELP_STRING([--with-linux-obj=PATH],
120 [Path to kernel build objects]),
121 [kernelbuild="$withval"])
123 AC_MSG_CHECKING([kernel source directory])
124 AS_IF([test -z "$kernelsrc"], [
125 AS_IF([test -e "/lib/modules/$(uname -r)/source"], [
126 headersdir="/lib/modules/$(uname -r)/source"
127 sourcelink=$(readlink -f "$headersdir")
128 ], [test -e "/lib/modules/$(uname -r)/build"], [
129 headersdir="/lib/modules/$(uname -r)/build"
130 sourcelink=$(readlink -f "$headersdir")
132 sourcelink=$(ls -1d /usr/src/kernels/* \
134 2>/dev/null | grep -v obj | tail -1)
137 AS_IF([test -n "$sourcelink" && test -e ${sourcelink}], [
138 kernelsrc=`readlink -f ${sourcelink}`
140 AC_MSG_RESULT([Not found])
142 *** Please make sure the kernel devel package for your distribution
143 *** is installed then try again. If that fails you can specify the
144 *** location of the kernel source with the '--with-linux=PATH' option.])
147 AS_IF([test "$kernelsrc" = "NONE"], [
152 AC_MSG_RESULT([$kernelsrc])
153 AC_MSG_CHECKING([kernel build directory])
154 AS_IF([test -z "$kernelbuild"], [
155 AS_IF([test -e "/lib/modules/$(uname -r)/build"], [
156 kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
157 ], [test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}], [
158 kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
159 ], [test -d ${kernelsrc}-obj/${target_cpu}/default], [
160 kernelbuild=${kernelsrc}-obj/${target_cpu}/default
161 ], [test -d `dirname ${kernelsrc}`/build-${target_cpu}], [
162 kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
164 kernelbuild=${kernelsrc}
167 AC_MSG_RESULT([$kernelbuild])
169 AC_MSG_CHECKING([kernel source version])
170 utsrelease1=$kernelbuild/include/linux/version.h
171 utsrelease2=$kernelbuild/include/linux/utsrelease.h
172 utsrelease3=$kernelbuild/include/generated/utsrelease.h
173 AS_IF([test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1], [
174 utsrelease=linux/version.h
175 ], [test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2], [
176 utsrelease=linux/utsrelease.h
177 ], [test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3], [
178 utsrelease=generated/utsrelease.h
181 AS_IF([test "$utsrelease"], [
182 kernsrcver=`(echo "#include <$utsrelease>";
183 echo "kernsrcver=UTS_RELEASE") |
184 cpp -I $kernelbuild/include |
185 grep "^kernsrcver=" | cut -d \" -f 2`
187 AS_IF([test -z "$kernsrcver"], [
188 AC_MSG_RESULT([Not found])
189 AC_MSG_ERROR([*** Cannot determine kernel version.])
192 AC_MSG_RESULT([Not found])
193 AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
196 AC_MSG_RESULT([$kernsrcver])
199 LINUX_OBJ=${kernelbuild}
200 LINUX_VERSION=${kernsrcver}
204 AC_SUBST(LINUX_VERSION)
206 ZFS_AC_MODULE_SYMVERS
210 dnl # Detect name used for the additional SPL Module.symvers file. If one
211 dnl # does not exist this is likely because the SPL has been configured
212 dnl # but not built. To allow recursive builds a good guess is made as to
213 dnl # what this file will be named based on what it is named in the kernel
214 dnl # build products. This file will first be used at link time so if
215 dnl # the guess is wrong the build will fail then. This unfortunately
216 dnl # means the ZFS package does not contain a reliable mechanism to
217 dnl # detect symbols exported by the SPL at configure time.
219 AC_DEFUN([ZFS_AC_SPL_MODULE_SYMVERS], [
220 AC_MSG_CHECKING([spl file name for module symbols])
221 AS_IF([test -r $SPL_OBJ/Module.symvers], [
222 SPL_SYMBOLS=Module.symvers
223 ], [test -r $SPL_OBJ/Modules.symvers], [
224 SPL_SYMBOLS=Modules.symvers
225 ], [test -r $SPL_OBJ/module/Module.symvers], [
226 SPL_SYMBOLS=Module.symvers
227 ], [test -r $SPL_OBJ/module/Modules.symvers], [
228 SPL_SYMBOLS=Modules.symvers
230 SPL_SYMBOLS=$LINUX_SYMBOLS
233 AC_MSG_RESULT([$SPL_SYMBOLS])
234 AC_SUBST(SPL_SYMBOLS)
238 dnl # Detect the SPL module to be built against
240 AC_DEFUN([ZFS_AC_SPL], [
242 AS_HELP_STRING([--with-spl=PATH],
243 [Path to spl source]),
246 AC_ARG_WITH([spl-obj],
247 AS_HELP_STRING([--with-spl-obj=PATH],
248 [Path to spl build objects]),
249 [splbuild="$withval"])
252 AC_MSG_CHECKING([spl source directory])
253 AS_IF([test -z "$splsrc"], [
254 sourcelink=`ls -1d /usr/src/spl-*/${LINUX_VERSION} \
255 2>/dev/null | tail -1`
257 AS_IF([test -z "$sourcelink" || test ! -e $sourcelink], [
261 AS_IF([test -e $sourcelink], [
262 splsrc=`readlink -f ${sourcelink}`
264 AC_MSG_RESULT([Not found])
266 *** Please make sure the spl devel package for your distribution
267 *** is installed then try again. If that fails you can specify the
268 *** location of the spl source with the '--with-spl=PATH' option.])
271 AS_IF([test "$splsrc" = "NONE"], [
277 AC_MSG_RESULT([$splsrc])
278 AC_MSG_CHECKING([spl build directory])
279 AS_IF([test -z "$splbuild"], [
282 AC_MSG_RESULT([$splbuild])
284 AC_MSG_CHECKING([spl source version])
285 AS_IF([test -r $splbuild/spl_config.h &&
286 fgrep -q SPL_META_VERSION $splbuild/spl_config.h], [
288 splsrcver=`(echo "#include <spl_config.h>";
289 echo "splsrcver=SPL_META_VERSION-SPL_META_RELEASE") |
291 grep "^splsrcver=" | tr -d \" | cut -d= -f2`
294 AS_IF([test -z "$splsrcver"], [
295 AC_MSG_RESULT([Not found])
297 *** Cannot determine the version of the spl source.
298 *** Please prepare the spl source before running this script])
301 AC_MSG_RESULT([$splsrcver])
305 SPL_VERSION=${splsrcver}
309 AC_SUBST(SPL_VERSION)
311 ZFS_AC_SPL_MODULE_SYMVERS
315 dnl # Certain kernel build options are not supported. These must be
316 dnl # detected at configure time and cause a build failure. Otherwise
317 dnl # modules may be successfully built that behave incorrectly.
319 AC_DEFUN([ZFS_AC_KERNEL_CONFIG], [
321 AS_IF([test "$ZFS_META_LICENSE" = GPL], [
322 AC_DEFINE([HAVE_GPL_ONLY_SYMBOLS], [1],
323 [Define to 1 if licensed under the GPL])
326 ZFS_AC_KERNEL_CONFIG_PREEMPT
327 ZFS_AC_KERNEL_CONFIG_DEBUG_LOCK_ALLOC
331 dnl # Check CONFIG_PREEMPT
333 dnl # Premptible kernels will be supported in the future. But at the
334 dnl # moment there are a few places in the code which need to be updated
335 dnl # to accomidate them. Until that work occurs we should detect this
336 dnl # at configure time and fail with a sensible message. Otherwise,
337 dnl # people will be able to build successfully, however they will have
338 dnl # stability problems. See https://github.com/zfsonlinux/zfs/issues/83
340 AC_DEFUN([ZFS_AC_KERNEL_CONFIG_PREEMPT], [
342 ZFS_LINUX_CONFIG([PREEMPT],
344 *** Kernel built with CONFIG_PREEMPT which is not supported.
345 *** You must rebuild your kernel without this option.]), [])
349 dnl # Check CONFIG_DEBUG_LOCK_ALLOC
351 dnl # This is typically only set for debug kernels because it comes with
352 dnl # a performance penalty. However, when it is set it maps the non-GPL
353 dnl # symbol mutex_lock() to the GPL-only mutex_lock_nested() symbol.
354 dnl # This will cause a failure at link time which we'd rather know about
355 dnl # at compile time.
357 dnl # Since we plan to pursue making mutex_lock_nested() a non-GPL symbol
358 dnl # with the upstream community we add a check to detect this case.
360 AC_DEFUN([ZFS_AC_KERNEL_CONFIG_DEBUG_LOCK_ALLOC], [
362 ZFS_LINUX_CONFIG([DEBUG_LOCK_ALLOC], [
363 AC_MSG_CHECKING([whether mutex_lock() is GPL-only])
364 tmp_flags="$EXTRA_KCFLAGS"
365 ZFS_LINUX_TRY_COMPILE([
366 #include <linux/module.h>
367 #include <linux/mutex.h>
369 MODULE_LICENSE("$ZFS_META_LICENSE");
381 *** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is incompatible
382 *** with the CDDL license and will prevent the module linking stage
383 *** from succeeding. You must rebuild your kernel without this
384 *** option enabled.])
386 EXTRA_KCFLAGS="$tmp_flags"
391 dnl # ZFS_LINUX_CONFTEST
393 AC_DEFUN([ZFS_LINUX_CONFTEST], [
394 cat confdefs.h - <<_ACEOF >conftest.c
400 dnl # ZFS_LANG_PROGRAM(C)([PROLOGUE], [BODY])
402 m4_define([ZFS_LANG_PROGRAM], [
407 dnl Do *not* indent the following line: there may be CPP directives.
408 dnl Don't move the `;' right after for the same reason.
416 dnl # ZFS_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
418 AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
419 m4_ifvaln([$1], [ZFS_LINUX_CONFTEST([$1])])
420 rm -Rf build && mkdir -p build
421 echo "obj-m := conftest.o" >build/Makefile
423 [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])],
425 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
431 dnl # ZFS_LINUX_TRY_COMPILE like AC_TRY_COMPILE
433 AC_DEFUN([ZFS_LINUX_TRY_COMPILE],
434 [ZFS_LINUX_COMPILE_IFELSE(
435 [AC_LANG_SOURCE([ZFS_LANG_PROGRAM([[$1]], [[$2]])])],
437 [test -s build/conftest.o],
442 dnl # ZFS_LINUX_CONFIG
444 AC_DEFUN([ZFS_LINUX_CONFIG],
445 [AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
446 ZFS_LINUX_TRY_COMPILE([
447 #include <linux/module.h>
450 #error CONFIG_$1 not #defined
462 dnl # ZFS_CHECK_SYMBOL_EXPORT
463 dnl # check symbol exported or not
465 AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT],
466 [AC_MSG_CHECKING([whether symbol $1 is exported])
467 grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
468 $LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
470 AS_IF([test $rc -ne 0], [
473 grep -q -E "EXPORT_SYMBOL.*($1)" "$LINUX/$file" 2>/dev/null
475 AS_IF([test $rc -eq 0], [
480 AS_IF([test $export -eq 0], [