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_CONST_XATTR_HANDLER
43 ZFS_AC_KERNEL_XATTR_HANDLER_GET
44 ZFS_AC_KERNEL_XATTR_HANDLER_SET
45 ZFS_AC_KERNEL_SHOW_OPTIONS
47 ZFS_AC_KERNEL_EVICT_INODE
48 ZFS_AC_KERNEL_NR_CACHED_OBJECTS
49 ZFS_AC_KERNEL_FREE_CACHED_OBJECTS
50 ZFS_AC_KERNEL_FALLOCATE
51 ZFS_AC_KERNEL_TRUNCATE_RANGE
52 ZFS_AC_KERNEL_CREATE_UMODE_T
53 ZFS_AC_KERNEL_AUTOMOUNT
54 ZFS_AC_KERNEL_ENCODE_FH_WITH_INODE
55 ZFS_AC_KERNEL_CLEAR_INODE
56 ZFS_AC_KERNEL_INSERT_INODE_LOCKED
57 ZFS_AC_KERNEL_D_MAKE_ROOT
58 ZFS_AC_KERNEL_D_OBTAIN_ALIAS
59 ZFS_AC_KERNEL_CHECK_DISK_SIZE_CHANGE
60 ZFS_AC_KERNEL_TRUNCATE_SETSIZE
61 ZFS_AC_KERNEL_6ARGS_SECURITY_INODE_INIT_SECURITY
62 ZFS_AC_KERNEL_CALLBACK_SECURITY_INODE_INIT_SECURITY
63 ZFS_AC_KERNEL_MOUNT_NODEV
66 ZFS_AC_KERNEL_BDI_SETUP_AND_REGISTER
67 ZFS_AC_KERNEL_SET_NLINK
69 AS_IF([test "$LINUX_OBJ" != "$LINUX"], [
70 KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
72 AC_SUBST(KERNELMAKE_PARAMS)
75 dnl # -Wall -fno-strict-aliasing -Wstrict-prototypes and other
76 dnl # compiler options are added by the kernel build system.
77 KERNELCPPFLAGS="$KERNELCPPFLAGS $NO_UNUSED_BUT_SET_VARIABLE"
78 KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
79 KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""
81 AC_SUBST(KERNELCPPFLAGS)
85 dnl # Detect name used for Module.symvers file in kernel
87 AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [
88 modpost=$LINUX/scripts/Makefile.modpost
89 AC_MSG_CHECKING([kernel file name for module symbols])
90 AS_IF([test "x$enable_linux_builtin" != xyes -a -f "$modpost"], [
91 AS_IF([grep -q Modules.symvers $modpost], [
92 LINUX_SYMBOLS=Modules.symvers
94 LINUX_SYMBOLS=Module.symvers
97 AS_IF([test ! -f "$LINUX_OBJ/$LINUX_SYMBOLS"], [
99 *** Please make sure the kernel devel package for your distribution
100 *** is installed. If your building with a custom kernel make sure the
101 *** kernel is configured, built, and the '--with-linux=PATH' configure
102 *** option refers to the location of the kernel source.])
107 AC_MSG_RESULT($LINUX_SYMBOLS)
108 AC_SUBST(LINUX_SYMBOLS)
112 dnl # Detect the kernel to be built against
114 AC_DEFUN([ZFS_AC_KERNEL], [
116 AS_HELP_STRING([--with-linux=PATH],
117 [Path to kernel source]),
118 [kernelsrc="$withval"])
120 AC_ARG_WITH(linux-obj,
121 AS_HELP_STRING([--with-linux-obj=PATH],
122 [Path to kernel build objects]),
123 [kernelbuild="$withval"])
125 AC_MSG_CHECKING([kernel source directory])
126 AS_IF([test -z "$kernelsrc"], [
127 AS_IF([test -e "/lib/modules/$(uname -r)/source"], [
128 headersdir="/lib/modules/$(uname -r)/source"
129 sourcelink=$(readlink -f "$headersdir")
130 ], [test -e "/lib/modules/$(uname -r)/build"], [
131 headersdir="/lib/modules/$(uname -r)/build"
132 sourcelink=$(readlink -f "$headersdir")
134 sourcelink=$(ls -1d /usr/src/kernels/* \
136 2>/dev/null | grep -v obj | tail -1)
139 AS_IF([test -n "$sourcelink" && test -e ${sourcelink}], [
140 kernelsrc=`readlink -f ${sourcelink}`
142 AC_MSG_RESULT([Not found])
144 *** Please make sure the kernel devel package for your distribution
145 *** is installed then try again. If that fails you can specify the
146 *** location of the kernel source with the '--with-linux=PATH' option.])
149 AS_IF([test "$kernelsrc" = "NONE"], [
154 AC_MSG_RESULT([$kernelsrc])
155 AC_MSG_CHECKING([kernel build directory])
156 AS_IF([test -z "$kernelbuild"], [
157 AS_IF([test -e "/lib/modules/$(uname -r)/build"], [
158 kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
159 ], [test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}], [
160 kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
161 ], [test -d ${kernelsrc}-obj/${target_cpu}/default], [
162 kernelbuild=${kernelsrc}-obj/${target_cpu}/default
163 ], [test -d `dirname ${kernelsrc}`/build-${target_cpu}], [
164 kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
166 kernelbuild=${kernelsrc}
169 AC_MSG_RESULT([$kernelbuild])
171 AC_MSG_CHECKING([kernel source version])
172 utsrelease1=$kernelbuild/include/linux/version.h
173 utsrelease2=$kernelbuild/include/linux/utsrelease.h
174 utsrelease3=$kernelbuild/include/generated/utsrelease.h
175 AS_IF([test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1], [
176 utsrelease=linux/version.h
177 ], [test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2], [
178 utsrelease=linux/utsrelease.h
179 ], [test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3], [
180 utsrelease=generated/utsrelease.h
183 AS_IF([test "$utsrelease"], [
184 kernsrcver=`(echo "#include <$utsrelease>";
185 echo "kernsrcver=UTS_RELEASE") |
186 cpp -I $kernelbuild/include |
187 grep "^kernsrcver=" | cut -d \" -f 2`
189 AS_IF([test -z "$kernsrcver"], [
190 AC_MSG_RESULT([Not found])
191 AC_MSG_ERROR([*** Cannot determine kernel version.])
194 AC_MSG_RESULT([Not found])
195 if test "x$enable_linux_builtin" != xyes; then
196 AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
199 *** Cannot find UTS_RELEASE definition.
200 *** Please run 'make prepare' inside the kernel source tree.])
204 AC_MSG_RESULT([$kernsrcver])
207 LINUX_OBJ=${kernelbuild}
208 LINUX_VERSION=${kernsrcver}
212 AC_SUBST(LINUX_VERSION)
214 ZFS_AC_MODULE_SYMVERS
218 dnl # Detect name used for the additional SPL Module.symvers file. If one
219 dnl # does not exist this is likely because the SPL has been configured
220 dnl # but not built. To allow recursive builds a good guess is made as to
221 dnl # what this file will be named based on what it is named in the kernel
222 dnl # build products. This file will first be used at link time so if
223 dnl # the guess is wrong the build will fail then. This unfortunately
224 dnl # means the ZFS package does not contain a reliable mechanism to
225 dnl # detect symbols exported by the SPL at configure time.
227 AC_DEFUN([ZFS_AC_SPL_MODULE_SYMVERS], [
228 AC_MSG_CHECKING([spl file name for module symbols])
229 AS_IF([test -r $SPL_OBJ/Module.symvers], [
230 SPL_SYMBOLS=Module.symvers
231 ], [test -r $SPL_OBJ/Modules.symvers], [
232 SPL_SYMBOLS=Modules.symvers
233 ], [test -r $SPL_OBJ/module/Module.symvers], [
234 SPL_SYMBOLS=Module.symvers
235 ], [test -r $SPL_OBJ/module/Modules.symvers], [
236 SPL_SYMBOLS=Modules.symvers
238 SPL_SYMBOLS=$LINUX_SYMBOLS
241 AC_MSG_RESULT([$SPL_SYMBOLS])
242 AC_SUBST(SPL_SYMBOLS)
246 dnl # Detect the SPL module to be built against
248 AC_DEFUN([ZFS_AC_SPL], [
250 AS_HELP_STRING([--with-spl=PATH],
251 [Path to spl source]),
254 AC_ARG_WITH([spl-obj],
255 AS_HELP_STRING([--with-spl-obj=PATH],
256 [Path to spl build objects]),
257 [splbuild="$withval"])
260 AC_MSG_CHECKING([spl source directory])
261 AS_IF([test -z "$splsrc"], [
262 sourcelink=`ls -1d /usr/src/spl-*/${LINUX_VERSION} \
263 2>/dev/null | tail -1`
265 AS_IF([test -z "$sourcelink" || test ! -e $sourcelink], [
269 AS_IF([test -e $sourcelink], [
270 splsrc=`readlink -f ${sourcelink}`
272 AC_MSG_RESULT([Not found])
274 *** Please make sure the spl devel package for your distribution
275 *** is installed then try again. If that fails you can specify the
276 *** location of the spl source with the '--with-spl=PATH' option.])
279 AS_IF([test "$splsrc" = "NONE"], [
285 AC_MSG_RESULT([$splsrc])
286 AC_MSG_CHECKING([spl build directory])
287 AS_IF([test -z "$splbuild"], [
290 AC_MSG_RESULT([$splbuild])
292 AC_MSG_CHECKING([spl source version])
293 AS_IF([test -r $splbuild/spl_config.h &&
294 fgrep -q SPL_META_VERSION $splbuild/spl_config.h], [
296 splsrcver=`(echo "#include <spl_config.h>";
297 echo "splsrcver=SPL_META_VERSION-SPL_META_RELEASE") |
299 grep "^splsrcver=" | tr -d \" | cut -d= -f2`
302 AS_IF([test -z "$splsrcver"], [
303 AC_MSG_RESULT([Not found])
305 *** Cannot determine the version of the spl source.
306 *** Please prepare the spl source before running this script])
309 AC_MSG_RESULT([$splsrcver])
313 SPL_VERSION=${splsrcver}
317 AC_SUBST(SPL_VERSION)
319 ZFS_AC_SPL_MODULE_SYMVERS
323 dnl # Basic toolchain sanity check.
325 AC_DEFUN([ZFS_AC_TEST_MODULE],
326 [AC_MSG_CHECKING([whether modules can be built])
327 ZFS_LINUX_TRY_COMPILE([],[],[
331 if test "x$enable_linux_builtin" != xyes; then
332 AC_MSG_ERROR([*** Unable to build an empty module.])
335 *** Unable to build an empty module.
336 *** Please run 'make scripts' inside the kernel source tree.])
342 dnl # Certain kernel build options are not supported. These must be
343 dnl # detected at configure time and cause a build failure. Otherwise
344 dnl # modules may be successfully built that behave incorrectly.
346 AC_DEFUN([ZFS_AC_KERNEL_CONFIG], [
348 AS_IF([test "$ZFS_META_LICENSE" = GPL], [
349 AC_DEFINE([HAVE_GPL_ONLY_SYMBOLS], [1],
350 [Define to 1 if licensed under the GPL])
353 ZFS_AC_KERNEL_CONFIG_PREEMPT
354 ZFS_AC_KERNEL_CONFIG_DEBUG_LOCK_ALLOC
358 dnl # Check CONFIG_PREEMPT
360 dnl # Premptible kernels will be supported in the future. But at the
361 dnl # moment there are a few places in the code which need to be updated
362 dnl # to accomidate them. Until that work occurs we should detect this
363 dnl # at configure time and fail with a sensible message. Otherwise,
364 dnl # people will be able to build successfully, however they will have
365 dnl # stability problems. See https://github.com/zfsonlinux/zfs/issues/83
367 AC_DEFUN([ZFS_AC_KERNEL_CONFIG_PREEMPT], [
369 ZFS_LINUX_CONFIG([PREEMPT],
371 *** Kernel built with CONFIG_PREEMPT which is not supported.
372 *** You must rebuild your kernel without this option.]), [])
376 dnl # Check CONFIG_DEBUG_LOCK_ALLOC
378 dnl # This is typically only set for debug kernels because it comes with
379 dnl # a performance penalty. However, when it is set it maps the non-GPL
380 dnl # symbol mutex_lock() to the GPL-only mutex_lock_nested() symbol.
381 dnl # This will cause a failure at link time which we'd rather know about
382 dnl # at compile time.
384 dnl # Since we plan to pursue making mutex_lock_nested() a non-GPL symbol
385 dnl # with the upstream community we add a check to detect this case.
387 AC_DEFUN([ZFS_AC_KERNEL_CONFIG_DEBUG_LOCK_ALLOC], [
389 ZFS_LINUX_CONFIG([DEBUG_LOCK_ALLOC], [
390 AC_MSG_CHECKING([whether mutex_lock() is GPL-only])
391 tmp_flags="$EXTRA_KCFLAGS"
392 ZFS_LINUX_TRY_COMPILE([
393 #include <linux/module.h>
394 #include <linux/mutex.h>
396 MODULE_LICENSE("$ZFS_META_LICENSE");
408 *** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is incompatible
409 *** with the CDDL license and will prevent the module linking stage
410 *** from succeeding. You must rebuild your kernel without this
411 *** option enabled.])
413 EXTRA_KCFLAGS="$tmp_flags"
418 dnl # ZFS_LINUX_CONFTEST
420 AC_DEFUN([ZFS_LINUX_CONFTEST], [
421 cat confdefs.h - <<_ACEOF >conftest.c
427 dnl # ZFS_LANG_PROGRAM(C)([PROLOGUE], [BODY])
429 m4_define([ZFS_LANG_PROGRAM], [
434 dnl Do *not* indent the following line: there may be CPP directives.
435 dnl Don't move the `;' right after for the same reason.
443 dnl # ZFS_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
445 AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
446 m4_ifvaln([$1], [ZFS_LINUX_CONFTEST([$1])])
447 rm -Rf build && mkdir -p build && touch build/conftest.mod.c
448 echo "obj-m := conftest.o" >build/Makefile
450 test "x$enable_linux_builtin" = xyes && modpost_flag='modpost=true' # fake modpost stage
452 [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])],
454 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
460 dnl # ZFS_LINUX_TRY_COMPILE like AC_TRY_COMPILE
462 AC_DEFUN([ZFS_LINUX_TRY_COMPILE],
463 [ZFS_LINUX_COMPILE_IFELSE(
464 [AC_LANG_SOURCE([ZFS_LANG_PROGRAM([[$1]], [[$2]])])],
466 [test -s build/conftest.o],
471 dnl # ZFS_LINUX_CONFIG
473 AC_DEFUN([ZFS_LINUX_CONFIG],
474 [AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
475 ZFS_LINUX_TRY_COMPILE([
476 #include <linux/module.h>
479 #error CONFIG_$1 not #defined
491 dnl # ZFS_CHECK_SYMBOL_EXPORT
492 dnl # check symbol exported or not
494 AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT], [
495 grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
496 $LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
498 if test $rc -ne 0; then
501 grep -q -E "EXPORT_SYMBOL.*($1)" \
502 "$LINUX/$file" 2>/dev/null
504 if test $rc -eq 0; then
509 if test $export -eq 0; then :
520 dnl # ZFS_LINUX_TRY_COMPILE_SYMBOL
521 dnl # like ZFS_LINUX_TRY_COMPILE, except ZFS_CHECK_SYMBOL_EXPORT
522 dnl # is called if not compiling for builtin
524 AC_DEFUN([ZFS_LINUX_TRY_COMPILE_SYMBOL], [
525 ZFS_LINUX_TRY_COMPILE([$1], [$2], [rc=0], [rc=1])
526 if test $rc -ne 0; then :
529 if test "x$enable_linux_builtin" != xyes; then
530 ZFS_CHECK_SYMBOL_EXPORT([$3], [$4], [rc=0], [rc=1])
532 if test $rc -ne 0; then :