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0f62f3f9ab
GCC >+ 4.8's aggressive loop optimization breaks some of the iterators
over the dn_blkptr[] pseudo-array in dnode_phys. Since dn_blkptr[] is
defined as a single-element array, GCC believes an iterator can only
access index 0 and will unroll the loop into a single iteration.
One way to resolve the issue would be to cast the array to a pointer
and fix all the iterators that might break. The only loop where it
is known to cause a problem is this loop in dmu_objset_write_ready():
for (i = 0; i < dnp->dn_nblkptr; i++)
bp->blk_fill += dnp->dn_blkptr[i].blk_fill;
In the common case where dn_nblkptr is 3, the loop is only executed a
single time and "i" is equal to 1 following the loop.
The specific breakage caused by this problem is that the blk_fill of
root block pointers wouldn't be set properly when more than one blkptr
is in use (when no indrect blocks are needed).
The simple reproducing sequence is:
zpool create tank /tank.img
zdb -ddddd tank 0
Notice that "fill=31", however, there are two L0 indirect blocks with
"F=31" and "F=5". The fill count should be 36 rather than 31. This
problem causes an assert to be hit in a simple "zdb tank" when built
with --enable-debug.
However, this approach was not taken because we need to be absolutely
sure we catch all instances of this unwanted optimization. Therefore,
the build system has been updated to detect if GCC supports the
aggressive loop optimization. If it does the optimization will be
explicitly disabled using the -fno-aggressive-loop-optimization option.
Original-fix-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2010
Closes #2051
326 lines
8.6 KiB
Plaintext
326 lines
8.6 KiB
Plaintext
AC_DEFUN([ZFS_AC_LICENSE], [
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AC_MSG_CHECKING([zfs author])
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AC_MSG_RESULT([$ZFS_META_AUTHOR])
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AC_MSG_CHECKING([zfs license])
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AC_MSG_RESULT([$ZFS_META_LICENSE])
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])
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AC_DEFUN([ZFS_AC_DEBUG], [
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AC_MSG_CHECKING([whether debugging is enabled])
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AC_ARG_ENABLE([debug],
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[AS_HELP_STRING([--enable-debug],
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[Enable generic debug support @<:@default=no@:>@])],
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[],
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[enable_debug=no])
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AS_IF([test "x$enable_debug" = xyes],
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[
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KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG -Werror"
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HOSTCFLAGS="${HOSTCFLAGS} -DDEBUG -Werror"
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DEBUG_CFLAGS="-DDEBUG -Werror"
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DEBUG_STACKFLAGS="-fstack-check"
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DEBUG_ZFS="_with_debug"
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AC_DEFINE(ZFS_DEBUG, 1, [zfs debugging enabled])
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],
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[
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KERNELCPPFLAGS="${KERNELCPPFLAGS} -DNDEBUG "
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HOSTCFLAGS="${HOSTCFLAGS} -DNDEBUG "
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DEBUG_CFLAGS="-DNDEBUG"
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DEBUG_STACKFLAGS=""
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DEBUG_ZFS="_without_debug"
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])
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AC_SUBST(DEBUG_CFLAGS)
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AC_SUBST(DEBUG_STACKFLAGS)
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AC_SUBST(DEBUG_ZFS)
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AC_MSG_RESULT([$enable_debug])
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])
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AC_DEFUN([ZFS_AC_DEBUG_DMU_TX], [
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AC_ARG_ENABLE([debug-dmu-tx],
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[AS_HELP_STRING([--enable-debug-dmu-tx],
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[Enable dmu tx validation @<:@default=no@:>@])],
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[],
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[enable_debug_dmu_tx=no])
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AS_IF([test "x$enable_debug_dmu_tx" = xyes],
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[
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KERNELCPPFLAGS="${KERNELCPPFLAGS} -DDEBUG_DMU_TX"
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DEBUG_DMU_TX="_with_debug_dmu_tx"
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AC_DEFINE([DEBUG_DMU_TX], [1],
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[Define to 1 to enabled dmu tx validation])
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],
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[
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DEBUG_DMU_TX="_without_debug_dmu_tx"
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])
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AC_SUBST(DEBUG_DMU_TX)
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AC_MSG_CHECKING([whether dmu tx validation is enabled])
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AC_MSG_RESULT([$enable_debug_dmu_tx])
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])
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AC_DEFUN([ZFS_AC_CONFIG_ALWAYS], [
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ZFS_AC_CONFIG_ALWAYS_NO_UNUSED_BUT_SET_VARIABLE
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ZFS_AC_CONFIG_ALWAYS_NO_AGGRESSIVE_LOOP_OPTIMIZATIONS
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])
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AC_DEFUN([ZFS_AC_CONFIG], [
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TARGET_ASM_DIR=asm-generic
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AC_SUBST(TARGET_ASM_DIR)
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ZFS_CONFIG=all
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AC_ARG_WITH([config],
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AS_HELP_STRING([--with-config=CONFIG],
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[Config file 'kernel|user|all|srpm']),
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[ZFS_CONFIG="$withval"])
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AC_ARG_ENABLE([linux-builtin],
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[AC_HELP_STRING([--enable-linux-builtin],
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[Configure for builtin in-tree kernel modules @<:@default=no@:>@])],
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[],
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[enable_linux_builtin=no])
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AC_MSG_CHECKING([zfs config])
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AC_MSG_RESULT([$ZFS_CONFIG]);
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AC_SUBST(ZFS_CONFIG)
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ZFS_AC_CONFIG_ALWAYS
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case "$ZFS_CONFIG" in
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kernel) ZFS_AC_CONFIG_KERNEL ;;
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user) ZFS_AC_CONFIG_USER ;;
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all) ZFS_AC_CONFIG_KERNEL
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ZFS_AC_CONFIG_USER ;;
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srpm) ;;
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*)
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AC_MSG_RESULT([Error!])
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AC_MSG_ERROR([Bad value "$ZFS_CONFIG" for --with-config,
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user kernel|user|all|srpm]) ;;
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esac
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AM_CONDITIONAL([CONFIG_USER],
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[test "$ZFS_CONFIG" = user -o "$ZFS_CONFIG" = all])
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AM_CONDITIONAL([CONFIG_KERNEL],
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[test "$ZFS_CONFIG" = kernel -o "$ZFS_CONFIG" = all] &&
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[test "x$enable_linux_builtin" != xyes ])
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])
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dnl #
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dnl # Check for rpm+rpmbuild to build RPM packages. If these tools
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dnl # are missing it is non-fatal but you will not be able to build
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dnl # RPM packages and will be warned if you try too.
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dnl #
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dnl # By default the generic spec file will be used because it requires
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dnl # minimal dependencies. Distribution specific spec files can be
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dnl # placed under the 'rpm/<distribution>' directory and enabled using
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dnl # the --with-spec=<distribution> configure option.
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dnl #
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AC_DEFUN([ZFS_AC_RPM], [
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RPM=rpm
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RPMBUILD=rpmbuild
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AC_MSG_CHECKING([whether $RPM is available])
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AS_IF([tmp=$($RPM --version 2>/dev/null)], [
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RPM_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
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HAVE_RPM=yes
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AC_MSG_RESULT([$HAVE_RPM ($RPM_VERSION)])
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],[
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HAVE_RPM=no
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AC_MSG_RESULT([$HAVE_RPM])
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])
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AC_MSG_CHECKING([whether $RPMBUILD is available])
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AS_IF([tmp=$($RPMBUILD --version 2>/dev/null)], [
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RPMBUILD_VERSION=$(echo $tmp | $AWK '/RPM/ { print $[3] }')
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HAVE_RPMBUILD=yes
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AC_MSG_RESULT([$HAVE_RPMBUILD ($RPMBUILD_VERSION)])
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],[
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HAVE_RPMBUILD=no
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AC_MSG_RESULT([$HAVE_RPMBUILD])
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])
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RPM_DEFINE_COMMON='--define "$(DEBUG_ZFS) 1" --define "$(DEBUG_DMU_TX) 1"'
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RPM_DEFINE_UTIL=
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RPM_DEFINE_KMOD='--define "kernels $(LINUX_VERSION)"'
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RPM_DEFINE_DKMS=
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SRPM_DEFINE_COMMON='--define "build_src_rpm 1"'
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SRPM_DEFINE_UTIL=
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SRPM_DEFINE_KMOD=
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SRPM_DEFINE_DKMS=
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RPM_SPEC_DIR="rpm/generic"
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AC_ARG_WITH([spec],
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AS_HELP_STRING([--with-spec=SPEC],
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[Spec files 'generic|fedora']),
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[RPM_SPEC_DIR="rpm/$withval"])
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AC_MSG_CHECKING([whether spec files are available])
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AC_MSG_RESULT([yes ($RPM_SPEC_DIR/*.spec.in)])
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AC_SUBST(HAVE_RPM)
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AC_SUBST(RPM)
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AC_SUBST(RPM_VERSION)
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AC_SUBST(HAVE_RPMBUILD)
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AC_SUBST(RPMBUILD)
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AC_SUBST(RPMBUILD_VERSION)
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AC_SUBST(RPM_SPEC_DIR)
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AC_SUBST(RPM_DEFINE_UTIL)
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AC_SUBST(RPM_DEFINE_KMOD)
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AC_SUBST(RPM_DEFINE_DKMS)
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AC_SUBST(RPM_DEFINE_COMMON)
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AC_SUBST(SRPM_DEFINE_UTIL)
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AC_SUBST(SRPM_DEFINE_KMOD)
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AC_SUBST(SRPM_DEFINE_DKMS)
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AC_SUBST(SRPM_DEFINE_COMMON)
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])
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dnl #
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dnl # Check for dpkg+dpkg-buildpackage to build DEB packages. If these
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dnl # tools are missing it is non-fatal but you will not be able to build
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dnl # DEB packages and will be warned if you try too.
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dnl #
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AC_DEFUN([ZFS_AC_DPKG], [
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DPKG=dpkg
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DPKGBUILD=dpkg-buildpackage
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AC_MSG_CHECKING([whether $DPKG is available])
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AS_IF([tmp=$($DPKG --version 2>/dev/null)], [
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DPKG_VERSION=$(echo $tmp | $AWK '/Debian/ { print $[7] }')
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HAVE_DPKG=yes
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AC_MSG_RESULT([$HAVE_DPKG ($DPKG_VERSION)])
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],[
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HAVE_DPKG=no
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AC_MSG_RESULT([$HAVE_DPKG])
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])
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AC_MSG_CHECKING([whether $DPKGBUILD is available])
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AS_IF([tmp=$($DPKGBUILD --version 2>/dev/null)], [
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DPKGBUILD_VERSION=$(echo $tmp | \
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$AWK '/Debian/ { print $[4] }' | cut -f-4 -d'.')
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HAVE_DPKGBUILD=yes
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AC_MSG_RESULT([$HAVE_DPKGBUILD ($DPKGBUILD_VERSION)])
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],[
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HAVE_DPKGBUILD=no
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AC_MSG_RESULT([$HAVE_DPKGBUILD])
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])
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AC_SUBST(HAVE_DPKG)
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AC_SUBST(DPKG)
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AC_SUBST(DPKG_VERSION)
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AC_SUBST(HAVE_DPKGBUILD)
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AC_SUBST(DPKGBUILD)
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AC_SUBST(DPKGBUILD_VERSION)
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])
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dnl #
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dnl # Until native packaging for various different packing systems
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dnl # can be added the least we can do is attempt to use alien to
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dnl # convert the RPM packages to the needed package type. This is
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dnl # a hack but so far it has worked reasonable well.
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dnl #
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AC_DEFUN([ZFS_AC_ALIEN], [
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ALIEN=alien
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AC_MSG_CHECKING([whether $ALIEN is available])
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AS_IF([tmp=$($ALIEN --version 2>/dev/null)], [
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ALIEN_VERSION=$(echo $tmp | $AWK '{ print $[3] }')
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HAVE_ALIEN=yes
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AC_MSG_RESULT([$HAVE_ALIEN ($ALIEN_VERSION)])
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],[
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HAVE_ALIEN=no
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AC_MSG_RESULT([$HAVE_ALIEN])
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])
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AC_SUBST(HAVE_ALIEN)
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AC_SUBST(ALIEN)
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AC_SUBST(ALIEN_VERSION)
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])
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dnl #
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dnl # Using the VENDOR tag from config.guess set the default
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dnl # package type for 'make pkg': (rpm | deb | tgz)
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dnl #
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AC_DEFUN([ZFS_AC_DEFAULT_PACKAGE], [
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AC_MSG_CHECKING([linux distribution])
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if test -f /etc/toss-release ; then
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VENDOR=toss ;
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elif test -f /etc/fedora-release ; then
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VENDOR=fedora ;
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elif test -f /etc/redhat-release ; then
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VENDOR=redhat ;
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elif test -f /etc/gentoo-release ; then
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VENDOR=gentoo ;
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elif test -f /etc/arch-release ; then
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VENDOR=arch ;
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elif test -f /etc/SuSE-release ; then
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VENDOR=sles ;
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elif test -f /etc/slackware-version ; then
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VENDOR=slackware ;
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elif test -f /etc/lunar.release ; then
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VENDOR=lunar ;
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elif test -f /etc/lsb-release ; then
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VENDOR=ubuntu ;
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elif test -f /etc/debian_version ; then
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VENDOR=debian ;
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else
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VENDOR= ;
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fi
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AC_MSG_RESULT([$VENDOR])
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AC_SUBST(VENDOR)
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AC_MSG_CHECKING([default package type])
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case "$VENDOR" in
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toss) DEFAULT_PACKAGE=rpm ;;
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redhat) DEFAULT_PACKAGE=rpm ;;
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fedora) DEFAULT_PACKAGE=rpm ;;
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gentoo) DEFAULT_PACKAGE=tgz ;;
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arch) DEFAULT_PACKAGE=tgz ;;
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sles) DEFAULT_PACKAGE=rpm ;;
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slackware) DEFAULT_PACKAGE=tgz ;;
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lunar) DEFAULT_PACKAGE=tgz ;;
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ubuntu) DEFAULT_PACKAGE=deb ;;
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debian) DEFAULT_PACKAGE=deb ;;
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*) DEFAULT_PACKAGE=rpm ;;
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esac
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AC_MSG_RESULT([$DEFAULT_PACKAGE])
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AC_SUBST(DEFAULT_PACKAGE)
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DEFAULT_INIT_DIR=$sysconfdir/init.d
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AC_MSG_CHECKING([default init directory])
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AC_MSG_RESULT([$DEFAULT_INIT_DIR])
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AC_SUBST(DEFAULT_INIT_DIR)
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AC_MSG_CHECKING([default init script type])
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case "$VENDOR" in
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toss) DEFAULT_INIT_SCRIPT=redhat ;;
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redhat) DEFAULT_INIT_SCRIPT=redhat ;;
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fedora) DEFAULT_INIT_SCRIPT=fedora ;;
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gentoo) DEFAULT_INIT_SCRIPT=gentoo ;;
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arch) DEFAULT_INIT_SCRIPT=lsb ;;
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sles) DEFAULT_INIT_SCRIPT=lsb ;;
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slackware) DEFAULT_INIT_SCRIPT=lsb ;;
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lunar) DEFAULT_INIT_SCRIPT=lunar ;;
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ubuntu) DEFAULT_INIT_SCRIPT=lsb ;;
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debian) DEFAULT_INIT_SCRIPT=lsb ;;
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*) DEFAULT_INIT_SCRIPT=lsb ;;
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esac
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AC_MSG_RESULT([$DEFAULT_INIT_SCRIPT])
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AC_SUBST(DEFAULT_INIT_SCRIPT)
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])
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dnl #
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dnl # Default ZFS package configuration
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dnl #
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AC_DEFUN([ZFS_AC_PACKAGE], [
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ZFS_AC_DEFAULT_PACKAGE
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ZFS_AC_RPM
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ZFS_AC_DPKG
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ZFS_AC_ALIEN
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])
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