b18019d2d8
zvol_write() assumes that the write request must be written to stable storage
if rq_is_sync() is true. Unfortunately, this assumption is incorrect. Indeed,
"sync" does *not* mean what we think it means in the context of the Linux
block layer. This is well explained in linux/fs.h:
WRITE: A normal async write. Device will be plugged.
WRITE_SYNC: Synchronous write. Identical to WRITE, but passes down
the hint that someone will be waiting on this IO
shortly.
WRITE_FLUSH: Like WRITE_SYNC but with preceding cache flush.
WRITE_FUA: Like WRITE_SYNC but data is guaranteed to be on
non-volatile media on completion.
In other words, SYNC does not *mean* that the write must be on stable storage
on completion. It just means that someone is waiting on us to complete the
write request. Thus triggering a ZIL commit for each SYNC write request on a
ZVOL is unnecessary and harmful for performance. To make matters worse, ZVOL
users have no way to express that they actually want data to be written to
stable storage, which means the ZIL is broken for ZVOLs.
The request for stable storage is expressed by the FUA flag, so we must
commit the ZIL after the write if the FUA flag is set. In addition, we must
commit the ZIL before the write if the FLUSH flag is set.
Also, we must inform the block layer that we actually support FLUSH and FUA.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
437 lines
12 KiB
Plaintext
437 lines
12 KiB
Plaintext
dnl #
|
|
dnl # Default ZFS kernel configuration
|
|
dnl #
|
|
AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
|
|
ZFS_AC_KERNEL
|
|
ZFS_AC_SPL
|
|
ZFS_AC_KERNEL_CONFIG
|
|
ZFS_AC_KERNEL_BDEV_BLOCK_DEVICE_OPERATIONS
|
|
ZFS_AC_KERNEL_TYPE_FMODE_T
|
|
ZFS_AC_KERNEL_KOBJ_NAME_LEN
|
|
ZFS_AC_KERNEL_BLKDEV_GET_BY_PATH
|
|
ZFS_AC_KERNEL_OPEN_BDEV_EXCLUSIVE
|
|
ZFS_AC_KERNEL_INVALIDATE_BDEV_ARGS
|
|
ZFS_AC_KERNEL_BDEV_LOGICAL_BLOCK_SIZE
|
|
ZFS_AC_KERNEL_BIO_EMPTY_BARRIER
|
|
ZFS_AC_KERNEL_BIO_FAILFAST
|
|
ZFS_AC_KERNEL_BIO_FAILFAST_DTD
|
|
ZFS_AC_KERNEL_REQ_FAILFAST_MASK
|
|
ZFS_AC_KERNEL_BIO_END_IO_T_ARGS
|
|
ZFS_AC_KERNEL_BIO_RW_SYNC
|
|
ZFS_AC_KERNEL_BIO_RW_SYNCIO
|
|
ZFS_AC_KERNEL_REQ_SYNC
|
|
ZFS_AC_KERNEL_BLK_END_REQUEST
|
|
ZFS_AC_KERNEL_BLK_QUEUE_FLUSH
|
|
ZFS_AC_KERNEL_BLK_FETCH_REQUEST
|
|
ZFS_AC_KERNEL_BLK_REQUEUE_REQUEST
|
|
ZFS_AC_KERNEL_BLK_RQ_BYTES
|
|
ZFS_AC_KERNEL_BLK_RQ_POS
|
|
ZFS_AC_KERNEL_BLK_RQ_SECTORS
|
|
ZFS_AC_KERNEL_GET_DISK_RO
|
|
ZFS_AC_KERNEL_RQ_IS_SYNC
|
|
ZFS_AC_KERNEL_RQ_FOR_EACH_SEGMENT
|
|
ZFS_AC_KERNEL_CONST_XATTR_HANDLER
|
|
ZFS_AC_KERNEL_XATTR_HANDLER_GET
|
|
ZFS_AC_KERNEL_XATTR_HANDLER_SET
|
|
ZFS_AC_KERNEL_SHOW_OPTIONS
|
|
ZFS_AC_KERNEL_FSYNC
|
|
ZFS_AC_KERNEL_EVICT_INODE
|
|
ZFS_AC_KERNEL_NR_CACHED_OBJECTS
|
|
ZFS_AC_KERNEL_FREE_CACHED_OBJECTS
|
|
ZFS_AC_KERNEL_INSERT_INODE_LOCKED
|
|
ZFS_AC_KERNEL_D_OBTAIN_ALIAS
|
|
ZFS_AC_KERNEL_CHECK_DISK_SIZE_CHANGE
|
|
ZFS_AC_KERNEL_TRUNCATE_SETSIZE
|
|
ZFS_AC_KERNEL_6ARGS_SECURITY_INODE_INIT_SECURITY
|
|
ZFS_AC_KERNEL_CALLBACK_SECURITY_INODE_INIT_SECURITY
|
|
ZFS_AC_KERNEL_MOUNT_NODEV
|
|
ZFS_AC_KERNEL_SHRINK
|
|
ZFS_AC_KERNEL_BDI
|
|
ZFS_AC_KERNEL_BDI_SETUP_AND_REGISTER
|
|
ZFS_AC_KERNEL_SET_NLINK
|
|
|
|
AS_IF([test "$LINUX_OBJ" != "$LINUX"], [
|
|
KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
|
|
])
|
|
AC_SUBST(KERNELMAKE_PARAMS)
|
|
|
|
|
|
dnl # -Wall -fno-strict-aliasing -Wstrict-prototypes and other
|
|
dnl # compiler options are added by the kernel build system.
|
|
KERNELCPPFLAGS="$KERNELCPPFLAGS $NO_UNUSED_BUT_SET_VARIABLE"
|
|
KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
|
|
KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""
|
|
|
|
AC_SUBST(KERNELCPPFLAGS)
|
|
])
|
|
|
|
dnl #
|
|
dnl # Detect name used for Module.symvers file in kernel
|
|
dnl #
|
|
AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [
|
|
modpost=$LINUX/scripts/Makefile.modpost
|
|
AC_MSG_CHECKING([kernel file name for module symbols])
|
|
AS_IF([test -f "$modpost"], [
|
|
AS_IF([grep -q Modules.symvers $modpost], [
|
|
LINUX_SYMBOLS=Modules.symvers
|
|
], [
|
|
LINUX_SYMBOLS=Module.symvers
|
|
])
|
|
|
|
AS_IF([test ! -f "$LINUX_OBJ/$LINUX_SYMBOLS"], [
|
|
AC_MSG_ERROR([
|
|
*** Please make sure the kernel devel package for your distribution
|
|
*** is installed. If your building with a custom kernel make sure the
|
|
*** kernel is configured, built, and the '--with-linux=PATH' configure
|
|
*** option refers to the location of the kernel source.])
|
|
])
|
|
], [
|
|
LINUX_SYMBOLS=NONE
|
|
])
|
|
AC_MSG_RESULT($LINUX_SYMBOLS)
|
|
AC_SUBST(LINUX_SYMBOLS)
|
|
])
|
|
|
|
dnl #
|
|
dnl # Detect the kernel to be built against
|
|
dnl #
|
|
AC_DEFUN([ZFS_AC_KERNEL], [
|
|
AC_ARG_WITH([linux],
|
|
AS_HELP_STRING([--with-linux=PATH],
|
|
[Path to kernel source]),
|
|
[kernelsrc="$withval"])
|
|
|
|
AC_ARG_WITH(linux-obj,
|
|
AS_HELP_STRING([--with-linux-obj=PATH],
|
|
[Path to kernel build objects]),
|
|
[kernelbuild="$withval"])
|
|
|
|
AC_MSG_CHECKING([kernel source directory])
|
|
AS_IF([test -z "$kernelsrc"], [
|
|
AS_IF([test -e "/lib/modules/$(uname -r)/source"], [
|
|
headersdir="/lib/modules/$(uname -r)/source"
|
|
sourcelink=$(readlink -f "$headersdir")
|
|
], [test -e "/lib/modules/$(uname -r)/build"], [
|
|
headersdir="/lib/modules/$(uname -r)/build"
|
|
sourcelink=$(readlink -f "$headersdir")
|
|
], [
|
|
sourcelink=$(ls -1d /usr/src/kernels/* \
|
|
/usr/src/linux-* \
|
|
2>/dev/null | grep -v obj | tail -1)
|
|
])
|
|
|
|
AS_IF([test -n "$sourcelink" && test -e ${sourcelink}], [
|
|
kernelsrc=`readlink -f ${sourcelink}`
|
|
], [
|
|
AC_MSG_RESULT([Not found])
|
|
AC_MSG_ERROR([
|
|
*** Please make sure the kernel devel package for your distribution
|
|
*** is installed then try again. If that fails you can specify the
|
|
*** location of the kernel source with the '--with-linux=PATH' option.])
|
|
])
|
|
], [
|
|
AS_IF([test "$kernelsrc" = "NONE"], [
|
|
kernsrcver=NONE
|
|
])
|
|
])
|
|
|
|
AC_MSG_RESULT([$kernelsrc])
|
|
AC_MSG_CHECKING([kernel build directory])
|
|
AS_IF([test -z "$kernelbuild"], [
|
|
AS_IF([test -e "/lib/modules/$(uname -r)/build"], [
|
|
kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
|
|
], [test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}], [
|
|
kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
|
|
], [test -d ${kernelsrc}-obj/${target_cpu}/default], [
|
|
kernelbuild=${kernelsrc}-obj/${target_cpu}/default
|
|
], [test -d `dirname ${kernelsrc}`/build-${target_cpu}], [
|
|
kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
|
|
], [
|
|
kernelbuild=${kernelsrc}
|
|
])
|
|
])
|
|
AC_MSG_RESULT([$kernelbuild])
|
|
|
|
AC_MSG_CHECKING([kernel source version])
|
|
utsrelease1=$kernelbuild/include/linux/version.h
|
|
utsrelease2=$kernelbuild/include/linux/utsrelease.h
|
|
utsrelease3=$kernelbuild/include/generated/utsrelease.h
|
|
AS_IF([test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1], [
|
|
utsrelease=linux/version.h
|
|
], [test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2], [
|
|
utsrelease=linux/utsrelease.h
|
|
], [test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3], [
|
|
utsrelease=generated/utsrelease.h
|
|
])
|
|
|
|
AS_IF([test "$utsrelease"], [
|
|
kernsrcver=`(echo "#include <$utsrelease>";
|
|
echo "kernsrcver=UTS_RELEASE") |
|
|
cpp -I $kernelbuild/include |
|
|
grep "^kernsrcver=" | cut -d \" -f 2`
|
|
|
|
AS_IF([test -z "$kernsrcver"], [
|
|
AC_MSG_RESULT([Not found])
|
|
AC_MSG_ERROR([*** Cannot determine kernel version.])
|
|
])
|
|
], [
|
|
AC_MSG_RESULT([Not found])
|
|
AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
|
|
])
|
|
|
|
AC_MSG_RESULT([$kernsrcver])
|
|
|
|
LINUX=${kernelsrc}
|
|
LINUX_OBJ=${kernelbuild}
|
|
LINUX_VERSION=${kernsrcver}
|
|
|
|
AC_SUBST(LINUX)
|
|
AC_SUBST(LINUX_OBJ)
|
|
AC_SUBST(LINUX_VERSION)
|
|
|
|
ZFS_AC_MODULE_SYMVERS
|
|
])
|
|
|
|
dnl #
|
|
dnl # Detect name used for the additional SPL Module.symvers file. If one
|
|
dnl # does not exist this is likely because the SPL has been configured
|
|
dnl # but not built. To allow recursive builds a good guess is made as to
|
|
dnl # what this file will be named based on what it is named in the kernel
|
|
dnl # build products. This file will first be used at link time so if
|
|
dnl # the guess is wrong the build will fail then. This unfortunately
|
|
dnl # means the ZFS package does not contain a reliable mechanism to
|
|
dnl # detect symbols exported by the SPL at configure time.
|
|
dnl #
|
|
AC_DEFUN([ZFS_AC_SPL_MODULE_SYMVERS], [
|
|
AC_MSG_CHECKING([spl file name for module symbols])
|
|
AS_IF([test -r $SPL_OBJ/Module.symvers], [
|
|
SPL_SYMBOLS=Module.symvers
|
|
], [test -r $SPL_OBJ/Modules.symvers], [
|
|
SPL_SYMBOLS=Modules.symvers
|
|
], [test -r $SPL_OBJ/module/Module.symvers], [
|
|
SPL_SYMBOLS=Module.symvers
|
|
], [test -r $SPL_OBJ/module/Modules.symvers], [
|
|
SPL_SYMBOLS=Modules.symvers
|
|
], [
|
|
SPL_SYMBOLS=$LINUX_SYMBOLS
|
|
])
|
|
|
|
AC_MSG_RESULT([$SPL_SYMBOLS])
|
|
AC_SUBST(SPL_SYMBOLS)
|
|
])
|
|
|
|
dnl #
|
|
dnl # Detect the SPL module to be built against
|
|
dnl #
|
|
AC_DEFUN([ZFS_AC_SPL], [
|
|
AC_ARG_WITH([spl],
|
|
AS_HELP_STRING([--with-spl=PATH],
|
|
[Path to spl source]),
|
|
[splsrc="$withval"])
|
|
|
|
AC_ARG_WITH([spl-obj],
|
|
AS_HELP_STRING([--with-spl-obj=PATH],
|
|
[Path to spl build objects]),
|
|
[splbuild="$withval"])
|
|
|
|
|
|
AC_MSG_CHECKING([spl source directory])
|
|
AS_IF([test -z "$splsrc"], [
|
|
sourcelink=`ls -1d /usr/src/spl-*/${LINUX_VERSION} \
|
|
2>/dev/null | tail -1`
|
|
|
|
AS_IF([test -z "$sourcelink" || test ! -e $sourcelink], [
|
|
sourcelink=../spl
|
|
])
|
|
|
|
AS_IF([test -e $sourcelink], [
|
|
splsrc=`readlink -f ${sourcelink}`
|
|
], [
|
|
AC_MSG_RESULT([Not found])
|
|
AC_MSG_ERROR([
|
|
*** Please make sure the spl devel package for your distribution
|
|
*** is installed then try again. If that fails you can specify the
|
|
*** location of the spl source with the '--with-spl=PATH' option.])
|
|
])
|
|
], [
|
|
AS_IF([test "$splsrc" = "NONE"], [
|
|
splbuild=NONE
|
|
splsrcver=NONE
|
|
])
|
|
])
|
|
|
|
AC_MSG_RESULT([$splsrc])
|
|
AC_MSG_CHECKING([spl build directory])
|
|
AS_IF([test -z "$splbuild"], [
|
|
splbuild=${splsrc}
|
|
])
|
|
AC_MSG_RESULT([$splbuild])
|
|
|
|
AC_MSG_CHECKING([spl source version])
|
|
AS_IF([test -r $splbuild/spl_config.h &&
|
|
fgrep -q SPL_META_VERSION $splbuild/spl_config.h], [
|
|
|
|
splsrcver=`(echo "#include <spl_config.h>";
|
|
echo "splsrcver=SPL_META_VERSION-SPL_META_RELEASE") |
|
|
cpp -I $splbuild |
|
|
grep "^splsrcver=" | tr -d \" | cut -d= -f2`
|
|
])
|
|
|
|
AS_IF([test -z "$splsrcver"], [
|
|
AC_MSG_RESULT([Not found])
|
|
AC_MSG_ERROR([
|
|
*** Cannot determine the version of the spl source.
|
|
*** Please prepare the spl source before running this script])
|
|
])
|
|
|
|
AC_MSG_RESULT([$splsrcver])
|
|
|
|
SPL=${splsrc}
|
|
SPL_OBJ=${splbuild}
|
|
SPL_VERSION=${splsrcver}
|
|
|
|
AC_SUBST(SPL)
|
|
AC_SUBST(SPL_OBJ)
|
|
AC_SUBST(SPL_VERSION)
|
|
|
|
ZFS_AC_SPL_MODULE_SYMVERS
|
|
])
|
|
|
|
dnl #
|
|
dnl # Certain kernel build options are not supported. These must be
|
|
dnl # detected at configure time and cause a build failure. Otherwise
|
|
dnl # modules may be successfully built that behave incorrectly.
|
|
dnl #
|
|
dnl # CONFIG_PREEMPT - Preempt kernels require special handling.
|
|
dnl #
|
|
dnl # There are certain kernel build options which when enabled are
|
|
dnl # completely incompatible with non GPL kernel modules. It is best
|
|
dnl # to detect these at configure time and fail with a clear error
|
|
dnl # rather than build everything and fail during linking.
|
|
dnl #
|
|
dnl # CONFIG_DEBUG_LOCK_ALLOC - Maps mutex_lock() to mutex_lock_nested()
|
|
dnl #
|
|
AC_DEFUN([ZFS_AC_KERNEL_CONFIG], [
|
|
|
|
ZFS_LINUX_CONFIG([PREEMPT],
|
|
AC_MSG_ERROR([
|
|
*** Kernel built with CONFIG_PREEMPT which is not supported.
|
|
*** You must rebuild your kernel without this option.]), [])
|
|
|
|
AS_IF([test "$ZFS_META_LICENSE" = CDDL], [
|
|
ZFS_LINUX_CONFIG([DEBUG_LOCK_ALLOC],
|
|
AC_MSG_ERROR([
|
|
*** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is
|
|
*** incompatible with the CDDL license. You must rebuild
|
|
*** your kernel without this option.]), [])
|
|
])
|
|
|
|
AS_IF([test "$ZFS_META_LICENSE" = GPL], [
|
|
AC_DEFINE([HAVE_GPL_ONLY_SYMBOLS], [1],
|
|
[Define to 1 if licensed under the GPL])
|
|
])
|
|
])
|
|
|
|
dnl #
|
|
dnl # ZFS_LINUX_CONFTEST
|
|
dnl #
|
|
AC_DEFUN([ZFS_LINUX_CONFTEST], [
|
|
cat confdefs.h - <<_ACEOF >conftest.c
|
|
$1
|
|
_ACEOF
|
|
])
|
|
|
|
dnl #
|
|
dnl # ZFS_LANG_PROGRAM(C)([PROLOGUE], [BODY])
|
|
dnl #
|
|
m4_define([ZFS_LANG_PROGRAM], [
|
|
$1
|
|
int
|
|
main (void)
|
|
{
|
|
dnl Do *not* indent the following line: there may be CPP directives.
|
|
dnl Don't move the `;' right after for the same reason.
|
|
$2
|
|
;
|
|
return 0;
|
|
}
|
|
])
|
|
|
|
dnl #
|
|
dnl # ZFS_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
|
|
dnl #
|
|
AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
|
|
m4_ifvaln([$1], [ZFS_LINUX_CONFTEST([$1])])
|
|
rm -Rf build && mkdir -p build
|
|
echo "obj-m := conftest.o" >build/Makefile
|
|
AS_IF(
|
|
[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])],
|
|
[$4],
|
|
[_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
|
|
)
|
|
rm -Rf build
|
|
])
|
|
|
|
dnl #
|
|
dnl # ZFS_LINUX_TRY_COMPILE like AC_TRY_COMPILE
|
|
dnl #
|
|
AC_DEFUN([ZFS_LINUX_TRY_COMPILE],
|
|
[ZFS_LINUX_COMPILE_IFELSE(
|
|
[AC_LANG_SOURCE([ZFS_LANG_PROGRAM([[$1]], [[$2]])])],
|
|
[modules],
|
|
[test -s build/conftest.o],
|
|
[$3], [$4])
|
|
])
|
|
|
|
dnl #
|
|
dnl # ZFS_LINUX_CONFIG
|
|
dnl #
|
|
AC_DEFUN([ZFS_LINUX_CONFIG],
|
|
[AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
|
|
ZFS_LINUX_TRY_COMPILE([
|
|
#include <linux/module.h>
|
|
],[
|
|
#ifndef CONFIG_$1
|
|
#error CONFIG_$1 not #defined
|
|
#endif
|
|
],[
|
|
AC_MSG_RESULT([yes])
|
|
$2
|
|
],[
|
|
AC_MSG_RESULT([no])
|
|
$3
|
|
])
|
|
])
|
|
|
|
dnl #
|
|
dnl # ZFS_CHECK_SYMBOL_EXPORT
|
|
dnl # check symbol exported or not
|
|
dnl #
|
|
AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT],
|
|
[AC_MSG_CHECKING([whether symbol $1 is exported])
|
|
grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
|
|
$LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
|
|
rc=$?
|
|
AS_IF([test $rc -ne 0], [
|
|
export=0
|
|
for file in $2; do
|
|
grep -q -E "EXPORT_SYMBOL.*($1)" "$LINUX/$file" 2>/dev/null
|
|
rc=$?
|
|
AS_IF([test $rc -eq 0], [
|
|
export=1
|
|
break;
|
|
])
|
|
done
|
|
AS_IF([test $export -eq 0], [
|
|
AC_MSG_RESULT([no])
|
|
$4
|
|
], [
|
|
AC_MSG_RESULT([yes])
|
|
$3
|
|
])
|
|
], [
|
|
AC_MSG_RESULT([yes])
|
|
$3
|
|
])
|
|
])
|