2 dnl # Default ZFS kernel configuration
4 AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
9 ZFS_AC_KERNEL_BDEV_BLOCK_DEVICE_OPERATIONS
10 ZFS_AC_KERNEL_TYPE_FMODE_T
11 ZFS_AC_KERNEL_KOBJ_NAME_LEN
12 ZFS_AC_KERNEL_3ARG_BLKDEV_GET
13 ZFS_AC_KERNEL_BLKDEV_GET_BY_PATH
14 ZFS_AC_KERNEL_OPEN_BDEV_EXCLUSIVE
15 ZFS_AC_KERNEL_INVALIDATE_BDEV_ARGS
16 ZFS_AC_KERNEL_BDEV_LOGICAL_BLOCK_SIZE
17 ZFS_AC_KERNEL_BIO_EMPTY_BARRIER
18 ZFS_AC_KERNEL_BIO_FAILFAST
19 ZFS_AC_KERNEL_BIO_FAILFAST_DTD
20 ZFS_AC_KERNEL_REQ_FAILFAST_MASK
21 ZFS_AC_KERNEL_BIO_END_IO_T_ARGS
22 ZFS_AC_KERNEL_BIO_RW_SYNC
23 ZFS_AC_KERNEL_BIO_RW_SYNCIO
24 ZFS_AC_KERNEL_REQ_SYNC
25 ZFS_AC_KERNEL_BLK_END_REQUEST
26 ZFS_AC_KERNEL_BLK_QUEUE_FLUSH
27 ZFS_AC_KERNEL_BLK_QUEUE_MAX_HW_SECTORS
28 ZFS_AC_KERNEL_BLK_QUEUE_MAX_SEGMENTS
29 ZFS_AC_KERNEL_BLK_QUEUE_PHYSICAL_BLOCK_SIZE
30 ZFS_AC_KERNEL_BLK_QUEUE_IO_OPT
31 ZFS_AC_KERNEL_BLK_QUEUE_NONROT
32 ZFS_AC_KERNEL_BLK_QUEUE_DISCARD
33 ZFS_AC_KERNEL_BLK_FETCH_REQUEST
34 ZFS_AC_KERNEL_BLK_REQUEUE_REQUEST
35 ZFS_AC_KERNEL_BLK_RQ_BYTES
36 ZFS_AC_KERNEL_BLK_RQ_POS
37 ZFS_AC_KERNEL_BLK_RQ_SECTORS
38 ZFS_AC_KERNEL_GET_DISK_RO
39 ZFS_AC_KERNEL_GET_GENDISK
40 ZFS_AC_KERNEL_RQ_IS_SYNC
41 ZFS_AC_KERNEL_RQ_FOR_EACH_SEGMENT
42 ZFS_AC_KERNEL_DISCARD_GRANULARITY
43 ZFS_AC_KERNEL_CONST_XATTR_HANDLER
44 ZFS_AC_KERNEL_XATTR_HANDLER_GET
45 ZFS_AC_KERNEL_XATTR_HANDLER_SET
46 ZFS_AC_KERNEL_SHOW_OPTIONS
48 ZFS_AC_KERNEL_EVICT_INODE
49 ZFS_AC_KERNEL_NR_CACHED_OBJECTS
50 ZFS_AC_KERNEL_FREE_CACHED_OBJECTS
51 ZFS_AC_KERNEL_FALLOCATE
52 ZFS_AC_KERNEL_TRUNCATE_RANGE
53 ZFS_AC_KERNEL_CREATE_UMODE_T
54 ZFS_AC_KERNEL_AUTOMOUNT
55 ZFS_AC_KERNEL_ENCODE_FH_WITH_INODE
56 ZFS_AC_KERNEL_CLEAR_INODE
57 ZFS_AC_KERNEL_INSERT_INODE_LOCKED
58 ZFS_AC_KERNEL_D_MAKE_ROOT
59 ZFS_AC_KERNEL_D_OBTAIN_ALIAS
60 ZFS_AC_KERNEL_CHECK_DISK_SIZE_CHANGE
61 ZFS_AC_KERNEL_TRUNCATE_SETSIZE
62 ZFS_AC_KERNEL_6ARGS_SECURITY_INODE_INIT_SECURITY
63 ZFS_AC_KERNEL_CALLBACK_SECURITY_INODE_INIT_SECURITY
64 ZFS_AC_KERNEL_MOUNT_NODEV
67 ZFS_AC_KERNEL_BDI_SETUP_AND_REGISTER
68 ZFS_AC_KERNEL_SET_NLINK
70 AS_IF([test "$LINUX_OBJ" != "$LINUX"], [
71 KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
73 AC_SUBST(KERNELMAKE_PARAMS)
76 dnl # -Wall -fno-strict-aliasing -Wstrict-prototypes and other
77 dnl # compiler options are added by the kernel build system.
78 KERNELCPPFLAGS="$KERNELCPPFLAGS $NO_UNUSED_BUT_SET_VARIABLE"
79 KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
80 KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""
82 AC_SUBST(KERNELCPPFLAGS)
86 dnl # Detect name used for Module.symvers file in kernel
88 AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [
89 modpost=$LINUX/scripts/Makefile.modpost
90 AC_MSG_CHECKING([kernel file name for module symbols])
91 AS_IF([test "x$enable_linux_builtin" != xyes -a -f "$modpost"], [
92 AS_IF([grep -q Modules.symvers $modpost], [
93 LINUX_SYMBOLS=Modules.symvers
95 LINUX_SYMBOLS=Module.symvers
98 AS_IF([test ! -f "$LINUX_OBJ/$LINUX_SYMBOLS"], [
100 *** Please make sure the kernel devel package for your distribution
101 *** is installed. If your building with a custom kernel make sure the
102 *** kernel is configured, built, and the '--with-linux=PATH' configure
103 *** option refers to the location of the kernel source.])
108 AC_MSG_RESULT($LINUX_SYMBOLS)
109 AC_SUBST(LINUX_SYMBOLS)
113 dnl # Detect the kernel to be built against
115 AC_DEFUN([ZFS_AC_KERNEL], [
117 AS_HELP_STRING([--with-linux=PATH],
118 [Path to kernel source]),
119 [kernelsrc="$withval"])
121 AC_ARG_WITH(linux-obj,
122 AS_HELP_STRING([--with-linux-obj=PATH],
123 [Path to kernel build objects]),
124 [kernelbuild="$withval"])
126 AC_MSG_CHECKING([kernel source directory])
127 AS_IF([test -z "$kernelsrc"], [
128 AS_IF([test -e "/lib/modules/$(uname -r)/source"], [
129 headersdir="/lib/modules/$(uname -r)/source"
130 sourcelink=$(readlink -f "$headersdir")
131 ], [test -e "/lib/modules/$(uname -r)/build"], [
132 headersdir="/lib/modules/$(uname -r)/build"
133 sourcelink=$(readlink -f "$headersdir")
135 sourcelink=$(ls -1d /usr/src/kernels/* \
137 2>/dev/null | grep -v obj | tail -1)
140 AS_IF([test -n "$sourcelink" && test -e ${sourcelink}], [
141 kernelsrc=`readlink -f ${sourcelink}`
143 AC_MSG_RESULT([Not found])
145 *** Please make sure the kernel devel package for your distribution
146 *** is installed then try again. If that fails you can specify the
147 *** location of the kernel source with the '--with-linux=PATH' option.])
150 AS_IF([test "$kernelsrc" = "NONE"], [
155 AC_MSG_RESULT([$kernelsrc])
156 AC_MSG_CHECKING([kernel build directory])
157 AS_IF([test -z "$kernelbuild"], [
158 AS_IF([test -e "/lib/modules/$(uname -r)/build"], [
159 kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
160 ], [test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}], [
161 kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
162 ], [test -d ${kernelsrc}-obj/${target_cpu}/default], [
163 kernelbuild=${kernelsrc}-obj/${target_cpu}/default
164 ], [test -d `dirname ${kernelsrc}`/build-${target_cpu}], [
165 kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
167 kernelbuild=${kernelsrc}
170 AC_MSG_RESULT([$kernelbuild])
172 AC_MSG_CHECKING([kernel source version])
173 utsrelease1=$kernelbuild/include/linux/version.h
174 utsrelease2=$kernelbuild/include/linux/utsrelease.h
175 utsrelease3=$kernelbuild/include/generated/utsrelease.h
176 AS_IF([test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1], [
177 utsrelease=linux/version.h
178 ], [test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2], [
179 utsrelease=linux/utsrelease.h
180 ], [test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3], [
181 utsrelease=generated/utsrelease.h
184 AS_IF([test "$utsrelease"], [
185 kernsrcver=`(echo "#include <$utsrelease>";
186 echo "kernsrcver=UTS_RELEASE") |
187 cpp -I $kernelbuild/include |
188 grep "^kernsrcver=" | cut -d \" -f 2`
190 AS_IF([test -z "$kernsrcver"], [
191 AC_MSG_RESULT([Not found])
192 AC_MSG_ERROR([*** Cannot determine kernel version.])
195 AC_MSG_RESULT([Not found])
196 if test "x$enable_linux_builtin" != xyes; then
197 AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
200 *** Cannot find UTS_RELEASE definition.
201 *** Please run 'make prepare' inside the kernel source tree.])
205 AC_MSG_RESULT([$kernsrcver])
208 LINUX_OBJ=${kernelbuild}
209 LINUX_VERSION=${kernsrcver}
213 AC_SUBST(LINUX_VERSION)
215 ZFS_AC_MODULE_SYMVERS
219 dnl # Detect name used for the additional SPL Module.symvers file. If one
220 dnl # does not exist this is likely because the SPL has been configured
221 dnl # but not built. To allow recursive builds a good guess is made as to
222 dnl # what this file will be named based on what it is named in the kernel
223 dnl # build products. This file will first be used at link time so if
224 dnl # the guess is wrong the build will fail then. This unfortunately
225 dnl # means the ZFS package does not contain a reliable mechanism to
226 dnl # detect symbols exported by the SPL at configure time.
228 AC_DEFUN([ZFS_AC_SPL_MODULE_SYMVERS], [
229 AC_MSG_CHECKING([spl file name for module symbols])
230 AS_IF([test -r $SPL_OBJ/Module.symvers], [
231 SPL_SYMBOLS=Module.symvers
232 ], [test -r $SPL_OBJ/Modules.symvers], [
233 SPL_SYMBOLS=Modules.symvers
234 ], [test -r $SPL_OBJ/module/Module.symvers], [
235 SPL_SYMBOLS=Module.symvers
236 ], [test -r $SPL_OBJ/module/Modules.symvers], [
237 SPL_SYMBOLS=Modules.symvers
239 SPL_SYMBOLS=$LINUX_SYMBOLS
242 AC_MSG_RESULT([$SPL_SYMBOLS])
243 AC_SUBST(SPL_SYMBOLS)
247 dnl # Detect the SPL module to be built against
249 AC_DEFUN([ZFS_AC_SPL], [
251 AS_HELP_STRING([--with-spl=PATH],
252 [Path to spl source]),
255 AC_ARG_WITH([spl-obj],
256 AS_HELP_STRING([--with-spl-obj=PATH],
257 [Path to spl build objects]),
258 [splbuild="$withval"])
261 AC_MSG_CHECKING([spl source directory])
262 AS_IF([test -z "$splsrc"], [
263 sourcelink=`ls -1d /usr/src/spl-*/${LINUX_VERSION} \
264 2>/dev/null | tail -1`
266 AS_IF([test -z "$sourcelink" || test ! -e $sourcelink], [
270 AS_IF([test -e $sourcelink], [
271 splsrc=`readlink -f ${sourcelink}`
273 AC_MSG_RESULT([Not found])
275 *** Please make sure the spl devel package for your distribution
276 *** is installed then try again. If that fails you can specify the
277 *** location of the spl source with the '--with-spl=PATH' option.])
280 AS_IF([test "$splsrc" = "NONE"], [
286 AC_MSG_RESULT([$splsrc])
287 AC_MSG_CHECKING([spl build directory])
288 AS_IF([test -z "$splbuild"], [
291 AC_MSG_RESULT([$splbuild])
293 AC_MSG_CHECKING([spl source version])
294 AS_IF([test -r $splbuild/spl_config.h &&
295 fgrep -q SPL_META_VERSION $splbuild/spl_config.h], [
297 splsrcver=`(echo "#include <spl_config.h>";
298 echo "splsrcver=SPL_META_VERSION-SPL_META_RELEASE") |
300 grep "^splsrcver=" | tr -d \" | cut -d= -f2`
303 AS_IF([test -z "$splsrcver"], [
304 AC_MSG_RESULT([Not found])
306 *** Cannot determine the version of the spl source.
307 *** Please prepare the spl source before running this script])
310 AC_MSG_RESULT([$splsrcver])
314 SPL_VERSION=${splsrcver}
318 AC_SUBST(SPL_VERSION)
320 ZFS_AC_SPL_MODULE_SYMVERS
324 dnl # Basic toolchain sanity check.
326 AC_DEFUN([ZFS_AC_TEST_MODULE],
327 [AC_MSG_CHECKING([whether modules can be built])
328 ZFS_LINUX_TRY_COMPILE([],[],[
332 if test "x$enable_linux_builtin" != xyes; then
333 AC_MSG_ERROR([*** Unable to build an empty module.])
336 *** Unable to build an empty module.
337 *** Please run 'make scripts' inside the kernel source tree.])
343 dnl # Certain kernel build options are not supported. These must be
344 dnl # detected at configure time and cause a build failure. Otherwise
345 dnl # modules may be successfully built that behave incorrectly.
347 AC_DEFUN([ZFS_AC_KERNEL_CONFIG], [
349 AS_IF([test "$ZFS_META_LICENSE" = GPL], [
350 AC_DEFINE([HAVE_GPL_ONLY_SYMBOLS], [1],
351 [Define to 1 if licensed under the GPL])
354 ZFS_AC_KERNEL_CONFIG_PREEMPT
355 ZFS_AC_KERNEL_CONFIG_DEBUG_LOCK_ALLOC
359 dnl # Check CONFIG_PREEMPT
361 dnl # Premptible kernels will be supported in the future. But at the
362 dnl # moment there are a few places in the code which need to be updated
363 dnl # to accomidate them. Until that work occurs we should detect this
364 dnl # at configure time and fail with a sensible message. Otherwise,
365 dnl # people will be able to build successfully, however they will have
366 dnl # stability problems. See https://github.com/zfsonlinux/zfs/issues/83
368 AC_DEFUN([ZFS_AC_KERNEL_CONFIG_PREEMPT], [
370 ZFS_LINUX_CONFIG([PREEMPT],
372 *** Kernel built with CONFIG_PREEMPT which is not supported.
373 *** You must rebuild your kernel without this option.]), [])
377 dnl # Check CONFIG_DEBUG_LOCK_ALLOC
379 dnl # This is typically only set for debug kernels because it comes with
380 dnl # a performance penalty. However, when it is set it maps the non-GPL
381 dnl # symbol mutex_lock() to the GPL-only mutex_lock_nested() symbol.
382 dnl # This will cause a failure at link time which we'd rather know about
383 dnl # at compile time.
385 dnl # Since we plan to pursue making mutex_lock_nested() a non-GPL symbol
386 dnl # with the upstream community we add a check to detect this case.
388 AC_DEFUN([ZFS_AC_KERNEL_CONFIG_DEBUG_LOCK_ALLOC], [
390 ZFS_LINUX_CONFIG([DEBUG_LOCK_ALLOC], [
391 AC_MSG_CHECKING([whether mutex_lock() is GPL-only])
392 tmp_flags="$EXTRA_KCFLAGS"
393 ZFS_LINUX_TRY_COMPILE([
394 #include <linux/module.h>
395 #include <linux/mutex.h>
397 MODULE_LICENSE("$ZFS_META_LICENSE");
409 *** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is incompatible
410 *** with the CDDL license and will prevent the module linking stage
411 *** from succeeding. You must rebuild your kernel without this
412 *** option enabled.])
414 EXTRA_KCFLAGS="$tmp_flags"
419 dnl # ZFS_LINUX_CONFTEST
421 AC_DEFUN([ZFS_LINUX_CONFTEST], [
422 cat confdefs.h - <<_ACEOF >conftest.c
428 dnl # ZFS_LANG_PROGRAM(C)([PROLOGUE], [BODY])
430 m4_define([ZFS_LANG_PROGRAM], [
435 dnl Do *not* indent the following line: there may be CPP directives.
436 dnl Don't move the `;' right after for the same reason.
444 dnl # ZFS_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
446 AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
447 m4_ifvaln([$1], [ZFS_LINUX_CONFTEST([$1])])
448 rm -Rf build && mkdir -p build && touch build/conftest.mod.c
449 echo "obj-m := conftest.o" >build/Makefile
451 test "x$enable_linux_builtin" = xyes && modpost_flag='modpost=true' # fake modpost stage
453 [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 $modpost_flag) >/dev/null && AC_TRY_COMMAND([$3])],
455 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
461 dnl # ZFS_LINUX_TRY_COMPILE like AC_TRY_COMPILE
463 AC_DEFUN([ZFS_LINUX_TRY_COMPILE],
464 [ZFS_LINUX_COMPILE_IFELSE(
465 [AC_LANG_SOURCE([ZFS_LANG_PROGRAM([[$1]], [[$2]])])],
467 [test -s build/conftest.o],
472 dnl # ZFS_LINUX_CONFIG
474 AC_DEFUN([ZFS_LINUX_CONFIG],
475 [AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
476 ZFS_LINUX_TRY_COMPILE([
477 #include <linux/module.h>
480 #error CONFIG_$1 not #defined
492 dnl # ZFS_CHECK_SYMBOL_EXPORT
493 dnl # check symbol exported or not
495 AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT], [
496 grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
497 $LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
499 if test $rc -ne 0; then
502 grep -q -E "EXPORT_SYMBOL.*($1)" \
503 "$LINUX/$file" 2>/dev/null
505 if test $rc -eq 0; then
510 if test $export -eq 0; then :
521 dnl # ZFS_LINUX_TRY_COMPILE_SYMBOL
522 dnl # like ZFS_LINUX_TRY_COMPILE, except ZFS_CHECK_SYMBOL_EXPORT
523 dnl # is called if not compiling for builtin
525 AC_DEFUN([ZFS_LINUX_TRY_COMPILE_SYMBOL], [
526 ZFS_LINUX_TRY_COMPILE([$1], [$2], [rc=0], [rc=1])
527 if test $rc -ne 0; then :
530 if test "x$enable_linux_builtin" != xyes; then
531 ZFS_CHECK_SYMBOL_EXPORT([$3], [$4], [rc=0], [rc=1])
533 if test $rc -ne 0; then :