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. The '--with-spl-timeout' option can be passed
222 dnl # to pause here, waiting for the file to appear from a concurrently
223 dnl # building SPL package. If the file does not appear in time, a good
224 dnl # guess is made as to what this file will be named based on what it
225 dnl # is named in the kernel build products. This file will first be
226 dnl # used at link time so if the guess is wrong the build will fail
227 dnl # then. This unfortunately means the ZFS package does not contain a
228 dnl # reliable mechanism to detect symbols exported by the SPL at
229 dnl # configure time.
231 AC_DEFUN([ZFS_AC_SPL_MODULE_SYMVERS], [
232 AC_ARG_WITH([spl-timeout],
233 AS_HELP_STRING([--with-spl-timeout=SECS],
234 [Wait SECS for symvers file to appear @<:@default=0@:>@]),
235 [timeout="$withval"], [timeout=0])
237 AC_MSG_CHECKING([spl file name for module symbols])
241 AS_IF([test -r $SPL_OBJ/Module.symvers], [
242 SPL_SYMBOLS=Module.symvers
243 ], [test -r $SPL_OBJ/Modules.symvers], [
244 SPL_SYMBOLS=Modules.symvers
245 ], [test -r $SPL_OBJ/module/Module.symvers], [
246 SPL_SYMBOLS=Module.symvers
247 ], [test -r $SPL_OBJ/module/Modules.symvers], [
248 SPL_SYMBOLS=Modules.symvers
251 AS_IF([test $SPL_SYMBOLS != NONE -o $timeout -le 0], [
255 timeout=$((timeout-1))
259 AS_IF([test "$SPL_SYMBOLS" = NONE], [
260 SPL_SYMBOLS=$LINUX_SYMBOLS
263 AC_MSG_RESULT([$SPL_SYMBOLS])
264 AC_SUBST(SPL_SYMBOLS)
268 dnl # Detect the SPL module to be built against
270 AC_DEFUN([ZFS_AC_SPL], [
272 AS_HELP_STRING([--with-spl=PATH],
273 [Path to spl source]),
276 AC_ARG_WITH([spl-obj],
277 AS_HELP_STRING([--with-spl-obj=PATH],
278 [Path to spl build objects]),
279 [splbuild="$withval"])
282 AC_MSG_CHECKING([spl source directory])
283 AS_IF([test -z "$splsrc"], [
285 dnl # Look in the standard development package location
287 sourcelink=`ls -1d /usr/src/spl-*/${LINUX_VERSION} \
288 2>/dev/null | tail -1`
291 dnl # Look in the DKMS source location
293 AS_IF([test -z "$sourcelink" || test ! -e $sourcelink/spl_config.h], [
294 sourcelink=`ls -1d /var/lib/dkms/spl/*/build \
295 2>/dev/null | tail -1`
299 dnl # Look in the parent directory
301 AS_IF([test -z "$sourcelink" || test ! -e $sourcelink/spl_config.h], [
305 AS_IF([test -e $sourcelink/spl_config.h], [
306 splsrc=`readlink -f ${sourcelink}`
308 AC_MSG_RESULT([Not found])
310 *** Please make sure the spl devel package for your distribution
311 *** is installed then try again. If that fails you can specify the
312 *** location of the spl source with the '--with-spl=PATH' option.])
315 AS_IF([test "$splsrc" = "NONE"], [
321 AC_MSG_RESULT([$splsrc])
322 AC_MSG_CHECKING([spl build directory])
323 AS_IF([test -z "$splbuild"], [
326 AC_MSG_RESULT([$splbuild])
328 AC_MSG_CHECKING([spl source version])
329 AS_IF([test -r $splbuild/spl_config.h &&
330 fgrep -q SPL_META_VERSION $splbuild/spl_config.h], [
332 splsrcver=`(echo "#include <spl_config.h>";
333 echo "splsrcver=SPL_META_VERSION-SPL_META_RELEASE") |
335 grep "^splsrcver=" | tr -d \" | cut -d= -f2`
338 AS_IF([test -z "$splsrcver"], [
339 AC_MSG_RESULT([Not found])
341 *** Cannot determine the version of the spl source.
342 *** Please prepare the spl source before running this script])
345 AC_MSG_RESULT([$splsrcver])
349 SPL_VERSION=${splsrcver}
353 AC_SUBST(SPL_VERSION)
355 ZFS_AC_SPL_MODULE_SYMVERS
359 dnl # Basic toolchain sanity check.
361 AC_DEFUN([ZFS_AC_TEST_MODULE],
362 [AC_MSG_CHECKING([whether modules can be built])
363 ZFS_LINUX_TRY_COMPILE([],[],[
367 if test "x$enable_linux_builtin" != xyes; then
368 AC_MSG_ERROR([*** Unable to build an empty module.])
371 *** Unable to build an empty module.
372 *** Please run 'make scripts' inside the kernel source tree.])
378 dnl # Certain kernel build options are not supported. These must be
379 dnl # detected at configure time and cause a build failure. Otherwise
380 dnl # modules may be successfully built that behave incorrectly.
382 AC_DEFUN([ZFS_AC_KERNEL_CONFIG], [
384 AS_IF([test "$ZFS_META_LICENSE" = GPL], [
385 AC_DEFINE([HAVE_GPL_ONLY_SYMBOLS], [1],
386 [Define to 1 if licensed under the GPL])
389 ZFS_AC_KERNEL_CONFIG_PREEMPT
390 ZFS_AC_KERNEL_CONFIG_DEBUG_LOCK_ALLOC
394 dnl # Check CONFIG_PREEMPT
396 dnl # Premptible kernels will be supported in the future. But at the
397 dnl # moment there are a few places in the code which need to be updated
398 dnl # to accomidate them. Until that work occurs we should detect this
399 dnl # at configure time and fail with a sensible message. Otherwise,
400 dnl # people will be able to build successfully, however they will have
401 dnl # stability problems. See https://github.com/zfsonlinux/zfs/issues/83
403 AC_DEFUN([ZFS_AC_KERNEL_CONFIG_PREEMPT], [
405 ZFS_LINUX_CONFIG([PREEMPT],
407 *** Kernel built with CONFIG_PREEMPT which is not supported.
408 *** You must rebuild your kernel without this option.]), [])
412 dnl # Check CONFIG_DEBUG_LOCK_ALLOC
414 dnl # This is typically only set for debug kernels because it comes with
415 dnl # a performance penalty. However, when it is set it maps the non-GPL
416 dnl # symbol mutex_lock() to the GPL-only mutex_lock_nested() symbol.
417 dnl # This will cause a failure at link time which we'd rather know about
418 dnl # at compile time.
420 dnl # Since we plan to pursue making mutex_lock_nested() a non-GPL symbol
421 dnl # with the upstream community we add a check to detect this case.
423 AC_DEFUN([ZFS_AC_KERNEL_CONFIG_DEBUG_LOCK_ALLOC], [
425 ZFS_LINUX_CONFIG([DEBUG_LOCK_ALLOC], [
426 AC_MSG_CHECKING([whether mutex_lock() is GPL-only])
427 tmp_flags="$EXTRA_KCFLAGS"
428 ZFS_LINUX_TRY_COMPILE([
429 #include <linux/module.h>
430 #include <linux/mutex.h>
432 MODULE_LICENSE("$ZFS_META_LICENSE");
444 *** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is incompatible
445 *** with the CDDL license and will prevent the module linking stage
446 *** from succeeding. You must rebuild your kernel without this
447 *** option enabled.])
449 EXTRA_KCFLAGS="$tmp_flags"
454 dnl # ZFS_LINUX_CONFTEST
456 AC_DEFUN([ZFS_LINUX_CONFTEST], [
457 cat confdefs.h - <<_ACEOF >conftest.c
463 dnl # ZFS_LANG_PROGRAM(C)([PROLOGUE], [BODY])
465 m4_define([ZFS_LANG_PROGRAM], [
470 dnl Do *not* indent the following line: there may be CPP directives.
471 dnl Don't move the `;' right after for the same reason.
479 dnl # ZFS_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
481 AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
482 m4_ifvaln([$1], [ZFS_LINUX_CONFTEST([$1])])
483 rm -Rf build && mkdir -p build && touch build/conftest.mod.c
484 echo "obj-m := conftest.o" >build/Makefile
486 test "x$enable_linux_builtin" = xyes && modpost_flag='modpost=true' # fake modpost stage
488 [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])],
490 [_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
496 dnl # ZFS_LINUX_TRY_COMPILE like AC_TRY_COMPILE
498 AC_DEFUN([ZFS_LINUX_TRY_COMPILE],
499 [ZFS_LINUX_COMPILE_IFELSE(
500 [AC_LANG_SOURCE([ZFS_LANG_PROGRAM([[$1]], [[$2]])])],
502 [test -s build/conftest.o],
507 dnl # ZFS_LINUX_CONFIG
509 AC_DEFUN([ZFS_LINUX_CONFIG],
510 [AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
511 ZFS_LINUX_TRY_COMPILE([
512 #include <linux/module.h>
515 #error CONFIG_$1 not #defined
527 dnl # ZFS_CHECK_SYMBOL_EXPORT
528 dnl # check symbol exported or not
530 AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT], [
531 grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
532 $LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
534 if test $rc -ne 0; then
537 grep -q -E "EXPORT_SYMBOL.*($1)" \
538 "$LINUX/$file" 2>/dev/null
540 if test $rc -eq 0; then
545 if test $export -eq 0; then :
556 dnl # ZFS_LINUX_TRY_COMPILE_SYMBOL
557 dnl # like ZFS_LINUX_TRY_COMPILE, except ZFS_CHECK_SYMBOL_EXPORT
558 dnl # is called if not compiling for builtin
560 AC_DEFUN([ZFS_LINUX_TRY_COMPILE_SYMBOL], [
561 ZFS_LINUX_TRY_COMPILE([$1], [$2], [rc=0], [rc=1])
562 if test $rc -ne 0; then :
565 if test "x$enable_linux_builtin" != xyes; then
566 ZFS_CHECK_SYMBOL_EXPORT([$3], [$4], [rc=0], [rc=1])
568 if test $rc -ne 0; then :