mirror of
https://git.proxmox.com/git/mirror_zfs.git
synced 2024-11-17 01:51:00 +03:00
34037afe24
The Linux block device queue subsystem exposes a number of configurable settings described in Linux block/blk-settings.c. The defaults for these settings are tuned for hard drives, and are not optimized for ZVOLs. Proper configuration of these options would allow upper layers (I/O scheduler) to take better decisions about write merging and ordering. Detailed rationale: - max_hw_sectors is set to unlimited (UINT_MAX). zvol_write() is able to handle writes of any size, so there's no reason to impose a limit. Let the upper layer decide. - max_segments and max_segment_size are set to unlimited. zvol_write() will copy the requests' contents into a dbuf anyway, so the number and size of the segments are irrelevant. Let the upper layer decide. - physical_block_size and io_opt are set to the ZVOL's block size. This has the potential to somewhat alleviate issue #361 for ZVOLs, by warning the upper layers that writes smaller than the volume's block size will be slow. - The NONROT flag is set to indicate this isn't a rotational device. Although the backing zpool might be composed of rotational devices, the resulting ZVOL often doesn't exhibit the same behavior due to the COW mechanisms used by ZFS. Setting this flag will prevent upper layers from making useless decisions (such as reordering writes) based on incorrect assumptions about the behavior of the ZVOL. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
442 lines
12 KiB
Plaintext
442 lines
12 KiB
Plaintext
dnl #
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dnl # Default ZFS kernel configuration
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dnl #
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AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
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ZFS_AC_KERNEL
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ZFS_AC_SPL
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ZFS_AC_KERNEL_CONFIG
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ZFS_AC_KERNEL_BDEV_BLOCK_DEVICE_OPERATIONS
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ZFS_AC_KERNEL_TYPE_FMODE_T
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ZFS_AC_KERNEL_KOBJ_NAME_LEN
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ZFS_AC_KERNEL_BLKDEV_GET_BY_PATH
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ZFS_AC_KERNEL_OPEN_BDEV_EXCLUSIVE
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ZFS_AC_KERNEL_INVALIDATE_BDEV_ARGS
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ZFS_AC_KERNEL_BDEV_LOGICAL_BLOCK_SIZE
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ZFS_AC_KERNEL_BIO_EMPTY_BARRIER
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ZFS_AC_KERNEL_BIO_FAILFAST
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ZFS_AC_KERNEL_BIO_FAILFAST_DTD
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ZFS_AC_KERNEL_REQ_FAILFAST_MASK
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ZFS_AC_KERNEL_BIO_END_IO_T_ARGS
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ZFS_AC_KERNEL_BIO_RW_SYNC
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ZFS_AC_KERNEL_BIO_RW_SYNCIO
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ZFS_AC_KERNEL_REQ_SYNC
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ZFS_AC_KERNEL_BLK_END_REQUEST
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ZFS_AC_KERNEL_BLK_QUEUE_FLUSH
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ZFS_AC_KERNEL_BLK_QUEUE_MAX_HW_SECTORS
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ZFS_AC_KERNEL_BLK_QUEUE_MAX_SEGMENTS
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ZFS_AC_KERNEL_BLK_QUEUE_PHYSICAL_BLOCK_SIZE
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ZFS_AC_KERNEL_BLK_QUEUE_IO_OPT
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ZFS_AC_KERNEL_BLK_QUEUE_NONROT
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ZFS_AC_KERNEL_BLK_FETCH_REQUEST
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ZFS_AC_KERNEL_BLK_REQUEUE_REQUEST
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ZFS_AC_KERNEL_BLK_RQ_BYTES
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ZFS_AC_KERNEL_BLK_RQ_POS
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ZFS_AC_KERNEL_BLK_RQ_SECTORS
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ZFS_AC_KERNEL_GET_DISK_RO
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ZFS_AC_KERNEL_RQ_IS_SYNC
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ZFS_AC_KERNEL_RQ_FOR_EACH_SEGMENT
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ZFS_AC_KERNEL_CONST_XATTR_HANDLER
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ZFS_AC_KERNEL_XATTR_HANDLER_GET
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ZFS_AC_KERNEL_XATTR_HANDLER_SET
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ZFS_AC_KERNEL_SHOW_OPTIONS
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ZFS_AC_KERNEL_FSYNC
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ZFS_AC_KERNEL_EVICT_INODE
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ZFS_AC_KERNEL_NR_CACHED_OBJECTS
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ZFS_AC_KERNEL_FREE_CACHED_OBJECTS
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ZFS_AC_KERNEL_INSERT_INODE_LOCKED
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ZFS_AC_KERNEL_D_OBTAIN_ALIAS
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ZFS_AC_KERNEL_CHECK_DISK_SIZE_CHANGE
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ZFS_AC_KERNEL_TRUNCATE_SETSIZE
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ZFS_AC_KERNEL_6ARGS_SECURITY_INODE_INIT_SECURITY
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ZFS_AC_KERNEL_CALLBACK_SECURITY_INODE_INIT_SECURITY
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ZFS_AC_KERNEL_MOUNT_NODEV
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ZFS_AC_KERNEL_SHRINK
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ZFS_AC_KERNEL_BDI
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ZFS_AC_KERNEL_BDI_SETUP_AND_REGISTER
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ZFS_AC_KERNEL_SET_NLINK
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AS_IF([test "$LINUX_OBJ" != "$LINUX"], [
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KERNELMAKE_PARAMS="$KERNELMAKE_PARAMS O=$LINUX_OBJ"
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])
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AC_SUBST(KERNELMAKE_PARAMS)
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dnl # -Wall -fno-strict-aliasing -Wstrict-prototypes and other
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dnl # compiler options are added by the kernel build system.
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KERNELCPPFLAGS="$KERNELCPPFLAGS $NO_UNUSED_BUT_SET_VARIABLE"
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KERNELCPPFLAGS="$KERNELCPPFLAGS -DHAVE_SPL -D_KERNEL"
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KERNELCPPFLAGS="$KERNELCPPFLAGS -DTEXT_DOMAIN=\\\"zfs-linux-kernel\\\""
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AC_SUBST(KERNELCPPFLAGS)
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])
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dnl #
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dnl # Detect name used for Module.symvers file in kernel
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dnl #
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AC_DEFUN([ZFS_AC_MODULE_SYMVERS], [
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modpost=$LINUX/scripts/Makefile.modpost
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AC_MSG_CHECKING([kernel file name for module symbols])
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AS_IF([test -f "$modpost"], [
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AS_IF([grep -q Modules.symvers $modpost], [
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LINUX_SYMBOLS=Modules.symvers
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], [
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LINUX_SYMBOLS=Module.symvers
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])
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AS_IF([test ! -f "$LINUX_OBJ/$LINUX_SYMBOLS"], [
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AC_MSG_ERROR([
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*** Please make sure the kernel devel package for your distribution
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*** is installed. If your building with a custom kernel make sure the
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*** kernel is configured, built, and the '--with-linux=PATH' configure
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*** option refers to the location of the kernel source.])
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])
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], [
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LINUX_SYMBOLS=NONE
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])
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AC_MSG_RESULT($LINUX_SYMBOLS)
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AC_SUBST(LINUX_SYMBOLS)
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])
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dnl #
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dnl # Detect the kernel to be built against
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL], [
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AC_ARG_WITH([linux],
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AS_HELP_STRING([--with-linux=PATH],
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[Path to kernel source]),
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[kernelsrc="$withval"])
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AC_ARG_WITH(linux-obj,
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AS_HELP_STRING([--with-linux-obj=PATH],
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[Path to kernel build objects]),
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[kernelbuild="$withval"])
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AC_MSG_CHECKING([kernel source directory])
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AS_IF([test -z "$kernelsrc"], [
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AS_IF([test -e "/lib/modules/$(uname -r)/source"], [
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headersdir="/lib/modules/$(uname -r)/source"
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sourcelink=$(readlink -f "$headersdir")
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], [test -e "/lib/modules/$(uname -r)/build"], [
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headersdir="/lib/modules/$(uname -r)/build"
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sourcelink=$(readlink -f "$headersdir")
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], [
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sourcelink=$(ls -1d /usr/src/kernels/* \
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/usr/src/linux-* \
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2>/dev/null | grep -v obj | tail -1)
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])
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AS_IF([test -n "$sourcelink" && test -e ${sourcelink}], [
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kernelsrc=`readlink -f ${sourcelink}`
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], [
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AC_MSG_RESULT([Not found])
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AC_MSG_ERROR([
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*** Please make sure the kernel devel package for your distribution
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*** is installed then try again. If that fails you can specify the
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*** location of the kernel source with the '--with-linux=PATH' option.])
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])
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], [
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AS_IF([test "$kernelsrc" = "NONE"], [
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kernsrcver=NONE
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])
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])
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AC_MSG_RESULT([$kernelsrc])
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AC_MSG_CHECKING([kernel build directory])
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AS_IF([test -z "$kernelbuild"], [
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AS_IF([test -e "/lib/modules/$(uname -r)/build"], [
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kernelbuild=`readlink -f /lib/modules/$(uname -r)/build`
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], [test -d ${kernelsrc}-obj/${target_cpu}/${target_cpu}], [
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kernelbuild=${kernelsrc}-obj/${target_cpu}/${target_cpu}
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], [test -d ${kernelsrc}-obj/${target_cpu}/default], [
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kernelbuild=${kernelsrc}-obj/${target_cpu}/default
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], [test -d `dirname ${kernelsrc}`/build-${target_cpu}], [
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kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
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], [
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kernelbuild=${kernelsrc}
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])
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])
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AC_MSG_RESULT([$kernelbuild])
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AC_MSG_CHECKING([kernel source version])
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utsrelease1=$kernelbuild/include/linux/version.h
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utsrelease2=$kernelbuild/include/linux/utsrelease.h
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utsrelease3=$kernelbuild/include/generated/utsrelease.h
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AS_IF([test -r $utsrelease1 && fgrep -q UTS_RELEASE $utsrelease1], [
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utsrelease=linux/version.h
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], [test -r $utsrelease2 && fgrep -q UTS_RELEASE $utsrelease2], [
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utsrelease=linux/utsrelease.h
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], [test -r $utsrelease3 && fgrep -q UTS_RELEASE $utsrelease3], [
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utsrelease=generated/utsrelease.h
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])
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AS_IF([test "$utsrelease"], [
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kernsrcver=`(echo "#include <$utsrelease>";
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echo "kernsrcver=UTS_RELEASE") |
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cpp -I $kernelbuild/include |
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grep "^kernsrcver=" | cut -d \" -f 2`
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AS_IF([test -z "$kernsrcver"], [
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AC_MSG_RESULT([Not found])
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AC_MSG_ERROR([*** Cannot determine kernel version.])
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])
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], [
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AC_MSG_RESULT([Not found])
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AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
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])
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AC_MSG_RESULT([$kernsrcver])
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LINUX=${kernelsrc}
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LINUX_OBJ=${kernelbuild}
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LINUX_VERSION=${kernsrcver}
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AC_SUBST(LINUX)
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AC_SUBST(LINUX_OBJ)
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AC_SUBST(LINUX_VERSION)
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ZFS_AC_MODULE_SYMVERS
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])
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dnl #
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dnl # Detect name used for the additional SPL Module.symvers file. If one
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dnl # does not exist this is likely because the SPL has been configured
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dnl # but not built. To allow recursive builds a good guess is made as to
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dnl # what this file will be named based on what it is named in the kernel
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dnl # build products. This file will first be used at link time so if
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dnl # the guess is wrong the build will fail then. This unfortunately
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dnl # means the ZFS package does not contain a reliable mechanism to
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dnl # detect symbols exported by the SPL at configure time.
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dnl #
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AC_DEFUN([ZFS_AC_SPL_MODULE_SYMVERS], [
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AC_MSG_CHECKING([spl file name for module symbols])
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AS_IF([test -r $SPL_OBJ/Module.symvers], [
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SPL_SYMBOLS=Module.symvers
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], [test -r $SPL_OBJ/Modules.symvers], [
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SPL_SYMBOLS=Modules.symvers
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], [test -r $SPL_OBJ/module/Module.symvers], [
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SPL_SYMBOLS=Module.symvers
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], [test -r $SPL_OBJ/module/Modules.symvers], [
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SPL_SYMBOLS=Modules.symvers
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], [
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SPL_SYMBOLS=$LINUX_SYMBOLS
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])
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AC_MSG_RESULT([$SPL_SYMBOLS])
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AC_SUBST(SPL_SYMBOLS)
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])
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dnl #
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dnl # Detect the SPL module to be built against
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dnl #
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AC_DEFUN([ZFS_AC_SPL], [
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AC_ARG_WITH([spl],
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AS_HELP_STRING([--with-spl=PATH],
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[Path to spl source]),
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[splsrc="$withval"])
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AC_ARG_WITH([spl-obj],
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AS_HELP_STRING([--with-spl-obj=PATH],
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[Path to spl build objects]),
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[splbuild="$withval"])
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AC_MSG_CHECKING([spl source directory])
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AS_IF([test -z "$splsrc"], [
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sourcelink=`ls -1d /usr/src/spl-*/${LINUX_VERSION} \
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2>/dev/null | tail -1`
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AS_IF([test -z "$sourcelink" || test ! -e $sourcelink], [
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sourcelink=../spl
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])
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AS_IF([test -e $sourcelink], [
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splsrc=`readlink -f ${sourcelink}`
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], [
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AC_MSG_RESULT([Not found])
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AC_MSG_ERROR([
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*** Please make sure the spl devel package for your distribution
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*** is installed then try again. If that fails you can specify the
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*** location of the spl source with the '--with-spl=PATH' option.])
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])
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], [
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AS_IF([test "$splsrc" = "NONE"], [
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splbuild=NONE
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splsrcver=NONE
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])
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])
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AC_MSG_RESULT([$splsrc])
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AC_MSG_CHECKING([spl build directory])
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AS_IF([test -z "$splbuild"], [
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splbuild=${splsrc}
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])
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AC_MSG_RESULT([$splbuild])
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AC_MSG_CHECKING([spl source version])
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AS_IF([test -r $splbuild/spl_config.h &&
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fgrep -q SPL_META_VERSION $splbuild/spl_config.h], [
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splsrcver=`(echo "#include <spl_config.h>";
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echo "splsrcver=SPL_META_VERSION-SPL_META_RELEASE") |
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cpp -I $splbuild |
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grep "^splsrcver=" | tr -d \" | cut -d= -f2`
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])
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AS_IF([test -z "$splsrcver"], [
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AC_MSG_RESULT([Not found])
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AC_MSG_ERROR([
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*** Cannot determine the version of the spl source.
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*** Please prepare the spl source before running this script])
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])
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AC_MSG_RESULT([$splsrcver])
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SPL=${splsrc}
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SPL_OBJ=${splbuild}
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SPL_VERSION=${splsrcver}
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AC_SUBST(SPL)
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AC_SUBST(SPL_OBJ)
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AC_SUBST(SPL_VERSION)
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ZFS_AC_SPL_MODULE_SYMVERS
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])
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dnl #
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dnl # Certain kernel build options are not supported. These must be
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dnl # detected at configure time and cause a build failure. Otherwise
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dnl # modules may be successfully built that behave incorrectly.
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dnl #
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dnl # CONFIG_PREEMPT - Preempt kernels require special handling.
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dnl #
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dnl # There are certain kernel build options which when enabled are
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dnl # completely incompatible with non GPL kernel modules. It is best
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dnl # to detect these at configure time and fail with a clear error
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dnl # rather than build everything and fail during linking.
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dnl #
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dnl # CONFIG_DEBUG_LOCK_ALLOC - Maps mutex_lock() to mutex_lock_nested()
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_CONFIG], [
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ZFS_LINUX_CONFIG([PREEMPT],
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AC_MSG_ERROR([
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*** Kernel built with CONFIG_PREEMPT which is not supported.
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*** You must rebuild your kernel without this option.]), [])
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AS_IF([test "$ZFS_META_LICENSE" = CDDL], [
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ZFS_LINUX_CONFIG([DEBUG_LOCK_ALLOC],
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AC_MSG_ERROR([
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*** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is
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*** incompatible with the CDDL license. You must rebuild
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*** your kernel without this option.]), [])
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])
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AS_IF([test "$ZFS_META_LICENSE" = GPL], [
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AC_DEFINE([HAVE_GPL_ONLY_SYMBOLS], [1],
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[Define to 1 if licensed under the GPL])
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])
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])
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dnl #
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dnl # ZFS_LINUX_CONFTEST
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dnl #
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AC_DEFUN([ZFS_LINUX_CONFTEST], [
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cat confdefs.h - <<_ACEOF >conftest.c
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$1
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_ACEOF
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])
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dnl #
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dnl # ZFS_LANG_PROGRAM(C)([PROLOGUE], [BODY])
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dnl #
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m4_define([ZFS_LANG_PROGRAM], [
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$1
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int
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main (void)
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{
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dnl Do *not* indent the following line: there may be CPP directives.
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dnl Don't move the `;' right after for the same reason.
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$2
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;
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return 0;
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}
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])
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dnl #
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dnl # ZFS_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
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dnl #
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AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
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m4_ifvaln([$1], [ZFS_LINUX_CONFTEST([$1])])
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rm -Rf build && mkdir -p build
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echo "obj-m := conftest.o" >build/Makefile
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AS_IF(
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[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])],
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[$4],
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[_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
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)
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rm -Rf build
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])
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dnl #
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dnl # ZFS_LINUX_TRY_COMPILE like AC_TRY_COMPILE
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dnl #
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AC_DEFUN([ZFS_LINUX_TRY_COMPILE],
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[ZFS_LINUX_COMPILE_IFELSE(
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[AC_LANG_SOURCE([ZFS_LANG_PROGRAM([[$1]], [[$2]])])],
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[modules],
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[test -s build/conftest.o],
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[$3], [$4])
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])
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dnl #
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dnl # ZFS_LINUX_CONFIG
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dnl #
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AC_DEFUN([ZFS_LINUX_CONFIG],
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[AC_MSG_CHECKING([whether Linux was built with CONFIG_$1])
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/module.h>
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],[
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#ifndef CONFIG_$1
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#error CONFIG_$1 not #defined
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#endif
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],[
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AC_MSG_RESULT([yes])
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$2
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],[
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AC_MSG_RESULT([no])
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$3
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])
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])
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dnl #
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dnl # ZFS_CHECK_SYMBOL_EXPORT
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dnl # check symbol exported or not
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dnl #
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AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT],
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[AC_MSG_CHECKING([whether symbol $1 is exported])
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grep -q -E '[[[:space:]]]$1[[[:space:]]]' \
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$LINUX_OBJ/$LINUX_SYMBOLS 2>/dev/null
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rc=$?
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AS_IF([test $rc -ne 0], [
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export=0
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for file in $2; do
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grep -q -E "EXPORT_SYMBOL.*($1)" "$LINUX/$file" 2>/dev/null
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rc=$?
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AS_IF([test $rc -eq 0], [
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export=1
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break;
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])
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done
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AS_IF([test $export -eq 0], [
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AC_MSG_RESULT([no])
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$4
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], [
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AC_MSG_RESULT([yes])
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$3
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])
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], [
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AC_MSG_RESULT([yes])
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$3
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])
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])
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