Merge branch 'builtin-clean'

Support in-tree builtin module building.

These commits add support for compiling the ZFS module as a built-in
kernel module by copying the module code into the kernel source tree.
Here's the procedure:

  - Create your kernel configuration (`.config` file) as usual. This
    has to be done first so that ZFS's configure script is able to
    detect kernel features correctly.
  - Run `make prepare scripts` inside the kernel source tree.
  - Run `./configure --enable-linux-builtin --with-linux=/usr/src/linux-...`
    inside the ZFS directory.
  - Run `./copy-builtin /usr/src/linux-...` inside the ZFS directory.
  - In the kernel source tree, enable the `CONFIG_ZFS` option (e.g. using
    `make menuconfig`). Note that this option depends on `CONFIG_SPL`
    (see zfsonlinux/spl@744038069d).
  - Build the kernel as usual.

ZFS module parameters can be set at boot time using the following syntax
on the kernel command line: `zfs.parameter_name=parameter_value`.

Note that you also need to rebuild the userspace tools (see
zfsonlinux/zfs@f09398cec6).

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #851

Makefile.in

@@ -904,20 +904,18 @@ uninstall-am:
 	tags tags-recursive uninstall uninstall-am
 
 srpm-modules:
-	$(MAKE) $(AM_MAKEFLAGS) pkg="${PACKAGE}-modules" srpm-common
+@CONFIG_KERNEL_TRUE@	$(MAKE) $(AM_MAKEFLAGS) pkg="${PACKAGE}-modules" srpm-common
 
 srpm-utils:
-	$(MAKE) $(AM_MAKEFLAGS) pkg="${PACKAGE}" srpm-common
+@CONFIG_USER_TRUE@	$(MAKE) $(AM_MAKEFLAGS) pkg="${PACKAGE}" srpm-common
 
 srpm: srpm-modules srpm-utils
 
 rpm-modules: srpm-modules
-	$(MAKE) $(AM_MAKEFLAGS) pkg="${PACKAGE}-modules" rpm-common
+@CONFIG_KERNEL_TRUE@	$(MAKE) $(AM_MAKEFLAGS) pkg="${PACKAGE}-modules" rpm-common
 
 rpm-utils: srpm-utils
-	$(MAKE) $(AM_MAKEFLAGS) pkg="${PACKAGE}" rpm-common
+@CONFIG_USER_TRUE@	$(MAKE) $(AM_MAKEFLAGS) pkg="${PACKAGE}" rpm-common
-
-rpm-modules: srpm-modules
 
 rpm: rpm-modules rpm-utils
 
@@ -995,25 +993,25 @@ deb-local:
 	fi)
 
 deb-modules: deb-local rpm-modules
-	name=${PACKAGE}-modules; \
+@CONFIG_KERNEL_TRUE@	name=${PACKAGE}-modules; \
-	version=${ZFS_META_VERSION}-${ZFS_META_RELEASE}; \
+@CONFIG_KERNEL_TRUE@	version=${ZFS_META_VERSION}-${ZFS_META_RELEASE}; \
-	release=`echo ${LINUX_VERSION} | $(SED) -e "s/-/_/g"`; \
+@CONFIG_KERNEL_TRUE@	release=`echo ${LINUX_VERSION} | $(SED) -e "s/-/_/g"`; \
-	arch=`$(RPM) -qp $${name}-$${version}.src.rpm --qf %{arch} | tail -1`; \
+@CONFIG_KERNEL_TRUE@	arch=`$(RPM) -qp $${name}-$${version}.src.rpm --qf %{arch} | tail -1`; \
-	pkg1=$${name}-$${version}_$${release}.$${arch}.rpm; \
+@CONFIG_KERNEL_TRUE@	pkg1=$${name}-$${version}_$${release}.$${arch}.rpm; \
-	pkg2=$${name}-devel-$${version}_$${release}.$${arch}.rpm; \
+@CONFIG_KERNEL_TRUE@	pkg2=$${name}-devel-$${version}_$${release}.$${arch}.rpm; \
-	fakeroot $(ALIEN) --scripts --to-deb $$pkg1 $$pkg2; \
+@CONFIG_KERNEL_TRUE@	fakeroot $(ALIEN) --scripts --to-deb $$pkg1 $$pkg2; \
-	$(RM) $$pkg1 $$pkg2
+@CONFIG_KERNEL_TRUE@	$(RM) $$pkg1 $$pkg2
 
 deb-utils: deb-local rpm-utils
-	name=${PACKAGE}; \
+@CONFIG_USER_TRUE@	name=${PACKAGE}; \
-	version=${ZFS_META_VERSION}-${ZFS_META_RELEASE}; \
+@CONFIG_USER_TRUE@	version=${ZFS_META_VERSION}-${ZFS_META_RELEASE}; \
-	arch=`$(RPM) -qp $${name}-$${version}.src.rpm --qf %{arch} | tail -1`; \
+@CONFIG_USER_TRUE@	arch=`$(RPM) -qp $${name}-$${version}.src.rpm --qf %{arch} | tail -1`; \
-	pkg1=$${name}-$${version}.$${arch}.rpm; \
+@CONFIG_USER_TRUE@	pkg1=$${name}-$${version}.$${arch}.rpm; \
-	pkg2=$${name}-devel-$${version}.$${arch}.rpm; \
+@CONFIG_USER_TRUE@	pkg2=$${name}-devel-$${version}.$${arch}.rpm; \
-	pkg3=$${name}-test-$${version}.$${arch}.rpm; \
+@CONFIG_USER_TRUE@	pkg3=$${name}-test-$${version}.$${arch}.rpm; \
-	pkg4=$${name}-dracut-$${version}.$${arch}.rpm; \
+@CONFIG_USER_TRUE@	pkg4=$${name}-dracut-$${version}.$${arch}.rpm; \
-	fakeroot $(ALIEN) --scripts --to-deb $$pkg1 $$pkg2 $$pkg3 $$pkg4; \
+@CONFIG_USER_TRUE@	fakeroot $(ALIEN) --scripts --to-deb $$pkg1 $$pkg2 $$pkg3 $$pkg4; \
-	$(RM) $$pkg1 $$pkg2 $$pkg3 $$pkg4
+@CONFIG_USER_TRUE@	$(RM) $$pkg1 $$pkg2 $$pkg3 $$pkg4
 
 deb: deb-modules deb-utils
 tgz-local:
@@ -1026,24 +1024,24 @@ tgz-local:
 	fi)
 
 tgz-modules: tgz-local rpm-modules
-	name=${PACKAGE}-modules; \
+@CONFIG_KERNEL_TRUE@	name=${PACKAGE}-modules; \
-	version=${ZFS_META_VERSION}-${ZFS_META_RELEASE}; \
+@CONFIG_KERNEL_TRUE@	version=${ZFS_META_VERSION}-${ZFS_META_RELEASE}; \
-	release=`echo ${LINUX_VERSION} | $(SED) -e "s/-/_/g"`; \
+@CONFIG_KERNEL_TRUE@	release=`echo ${LINUX_VERSION} | $(SED) -e "s/-/_/g"`; \
-	arch=`$(RPM) -qp $${name}-$${version}.src.rpm --qf %{arch} | tail -1`; \
+@CONFIG_KERNEL_TRUE@	arch=`$(RPM) -qp $${name}-$${version}.src.rpm --qf %{arch} | tail -1`; \
-	pkg1=$${name}-$${version}_$${release}.$${arch}.rpm; \
+@CONFIG_KERNEL_TRUE@	pkg1=$${name}-$${version}_$${release}.$${arch}.rpm; \
-	pkg2=$${name}-devel-$${version}_$${release}.$${arch}.rpm; \
+@CONFIG_KERNEL_TRUE@	pkg2=$${name}-devel-$${version}_$${release}.$${arch}.rpm; \
-	fakeroot $(ALIEN) --scripts --to-tgz $$pkg1 $$pkg2; \
+@CONFIG_KERNEL_TRUE@	fakeroot $(ALIEN) --scripts --to-tgz $$pkg1 $$pkg2; \
-	$(RM) $$pkg1 $$pkg2
+@CONFIG_KERNEL_TRUE@	$(RM) $$pkg1 $$pkg2
 
 tgz-utils: tgz-local rpm-utils
-	name=${PACKAGE}; \
+@CONFIG_USER_TRUE@	name=${PACKAGE}; \
-	version=${ZFS_META_VERSION}-${ZFS_META_RELEASE}; \
+@CONFIG_USER_TRUE@	version=${ZFS_META_VERSION}-${ZFS_META_RELEASE}; \
-	arch=`$(RPM) -qp $${name}-$${version}.src.rpm --qf %{arch} | tail -1`; \
+@CONFIG_USER_TRUE@	arch=`$(RPM) -qp $${name}-$${version}.src.rpm --qf %{arch} | tail -1`; \
-	pkg1=$${name}-$${version}.$${arch}.rpm; \
+@CONFIG_USER_TRUE@	pkg1=$${name}-$${version}.$${arch}.rpm; \
-	pkg2=$${name}-devel-$${version}.$${arch}.rpm; \
+@CONFIG_USER_TRUE@	pkg2=$${name}-devel-$${version}.$${arch}.rpm; \
-	pkg3=$${name}-test-$${version}.$${arch}.rpm; \
+@CONFIG_USER_TRUE@	pkg3=$${name}-test-$${version}.$${arch}.rpm; \
-	fakeroot $(ALIEN) --scripts --to-tgz $$pkg1 $$pkg2 $$pkg3; \
+@CONFIG_USER_TRUE@	fakeroot $(ALIEN) --scripts --to-tgz $$pkg1 $$pkg2 $$pkg3; \
-	$(RM) $$pkg1 $$pkg2 $$pkg3
+@CONFIG_USER_TRUE@	$(RM) $$pkg1 $$pkg2 $$pkg3
 
 tgz: tgz-modules tgz-utils
 
@@ -1056,10 +1054,10 @@ sarch-utils:
 sarch: sarch-modules sarch-utils
 
 arch-modules:
-	$(MAKE) $(AM_MAKEFLAGS) pkg="${PACKAGE}-modules" arch-common
+@CONFIG_KERNEL_TRUE@	$(MAKE) $(AM_MAKEFLAGS) pkg="${PACKAGE}-modules" arch-common
 
 arch-utils:
-	$(MAKE) $(AM_MAKEFLAGS) pkg="${PACKAGE}" arch-common
+@CONFIG_USER_TRUE@	$(MAKE) $(AM_MAKEFLAGS) pkg="${PACKAGE}" arch-common
 
 arch: arch-modules arch-utils
 

README.markdown

@@ -7,5 +7,11 @@ and ZVOL with a ZFS Posix Layer (ZPL) on the way!
     $ ./configure
     $ make pkg
 
+To copy the kernel code inside your kernel source tree for builtin
+compilation:
+
+    $ ./configure --enable-linux-builtin --with-linux=/usr/src/linux-...
+    $ ./copy-builtin /usr/src/linux-...
+
 Full documentation for building, configuring, and using ZFS can be
 found at: <http://zfsonlinux.org>

config/arch.am

@@ -13,10 +13,14 @@ sarch-utils:
 sarch: sarch-modules sarch-utils
 
 arch-modules:
+if CONFIG_KERNEL
 	$(MAKE) $(AM_MAKEFLAGS) pkg="${PACKAGE}-modules" arch-common
+endif
 
 arch-utils:
+if CONFIG_USER
 	$(MAKE) $(AM_MAKEFLAGS) pkg="${PACKAGE}" arch-common
+endif
 
 arch: arch-modules arch-utils
 

config/deb.am

@@ -15,6 +15,7 @@ deb-local:
 	fi)
 
 deb-modules: deb-local rpm-modules
+if CONFIG_KERNEL
 	name=${PACKAGE}-modules; \
 	version=${ZFS_META_VERSION}-${ZFS_META_RELEASE}; \
 	release=`echo ${LINUX_VERSION} | $(SED) -e "s/-/_/g"`; \
@@ -23,8 +24,10 @@ deb-modules: deb-local rpm-modules
 	pkg2=$${name}-devel-$${version}_$${release}.$${arch}.rpm; \
 	fakeroot $(ALIEN) --scripts --to-deb $$pkg1 $$pkg2; \
 	$(RM) $$pkg1 $$pkg2
+endif
 
 deb-utils: deb-local rpm-utils
+if CONFIG_USER
 	name=${PACKAGE}; \
 	version=${ZFS_META_VERSION}-${ZFS_META_RELEASE}; \
 	arch=`$(RPM) -qp $${name}-$${version}.src.rpm --qf %{arch} | tail -1`; \
@@ -34,5 +37,6 @@ deb-utils: deb-local rpm-utils
 	pkg4=$${name}-dracut-$${version}.$${arch}.rpm; \
 	fakeroot $(ALIEN) --scripts --to-deb $$pkg1 $$pkg2 $$pkg3 $$pkg4; \
 	$(RM) $$pkg1 $$pkg2 $$pkg3 $$pkg4
+endif
 
 deb: deb-modules deb-utils

config/kernel-bdi-setup-and-register.m4

@@ -5,11 +5,17 @@ dnl # exported by the kernel.  This is a trivial helper function but
 dnl # using it significantly simplifies the code surrounding setting
 dnl # up and tearing down the bdi structure.
 dnl #
-AC_DEFUN([ZFS_AC_KERNEL_BDI_SETUP_AND_REGISTER], [
+AC_DEFUN([ZFS_AC_KERNEL_BDI_SETUP_AND_REGISTER],
-	ZFS_CHECK_SYMBOL_EXPORT(
+	[AC_MSG_CHECKING([whether bdi_setup_and_register() is available])
-		[bdi_setup_and_register],
+	ZFS_LINUX_TRY_COMPILE_SYMBOL([
-		[mm/backing-dev.c],
+		#include <linux/backing-dev.h>
-		[AC_DEFINE(HAVE_BDI_SETUP_AND_REGISTER, 1,
+	], [
-		[bdi_setup_and_register() is available])],
+		bdi_setup_and_register(NULL, NULL, 0);
-		[])
+	], [bdi_setup_and_register], [mm/backing-dev.c], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_BDI_SETUP_AND_REGISTER, 1,
+		          [bdi_setup_and_register() is available])
+	], [
+		AC_MSG_RESULT(no)
+	])
 ])

config/kernel-blkdev-get-by-path.m4

@@ -3,11 +3,17 @@ dnl # 2.6.38 API change
 dnl # open_bdev_exclusive() changed to blkdev_get_by_path()
 dnl # close_bdev_exclusive() changed to blkdev_put()
 dnl #
-AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_GET_BY_PATH], [
+AC_DEFUN([ZFS_AC_KERNEL_BLKDEV_GET_BY_PATH],
-	ZFS_CHECK_SYMBOL_EXPORT(
+	[AC_MSG_CHECKING([whether blkdev_get_by_path() is available])
-		[blkdev_get_by_path],
+	ZFS_LINUX_TRY_COMPILE_SYMBOL([
-		[fs/block_dev.c],
+		#include <linux/fs.h>
-		[AC_DEFINE(HAVE_BLKDEV_GET_BY_PATH, 1,
+	], [
-		[blkdev_get_by_path() is available])],
+		blkdev_get_by_path(NULL, 0, NULL);
-		[])
+	], [blkdev_get_by_path], [fs/block_dev.c], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_BLKDEV_GET_BY_PATH, 1,
+		          [blkdev_get_by_path() is available])
+	], [
+		AC_MSG_RESULT(no)
+	])
 ])

config/kernel-check-disk-size-change.m4

@@ -2,11 +2,17 @@ dnl #
 dnl # 2.6.28 API change
 dnl # Added check_disk_size_change() helper function.
 dnl #
-AC_DEFUN([ZFS_AC_KERNEL_CHECK_DISK_SIZE_CHANGE], [
+AC_DEFUN([ZFS_AC_KERNEL_CHECK_DISK_SIZE_CHANGE],
-	ZFS_CHECK_SYMBOL_EXPORT(
+	[AC_MSG_CHECKING([whether check_disk_size_change() is available])
-		[check_disk_size_change],
+	ZFS_LINUX_TRY_COMPILE_SYMBOL([
-		[fs/block_dev.c],
+		#include <linux/fs.h>
-		[AC_DEFINE(HAVE_CHECK_DISK_SIZE_CHANGE, 1,
+	], [
-		[check_disk_size_change() is available])],
+		check_disk_size_change(NULL, NULL);
-		[])
+	], [check_disk_size_change], [fs/block_dev.c], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_CHECK_DISK_SIZE_CHANGE, 1,
+		          [check_disk_size_change() is available])
+	], [
+		AC_MSG_RESULT(no)
+	])
 ])

config/kernel-clear-inode.m4

@@ -19,11 +19,16 @@ dnl # Therefore, to ensure we have the correct API we only allow the
 dnl # clear_inode() compatibility code to be defined iff the evict_inode()
 dnl # functionality is also detected.
 dnl #
-AC_DEFUN([ZFS_AC_KERNEL_CLEAR_INODE], [
+AC_DEFUN([ZFS_AC_KERNEL_CLEAR_INODE],
-	ZFS_CHECK_SYMBOL_EXPORT(
+	[AC_MSG_CHECKING([whether clear_inode() is available])
-		[clear_inode],
+	ZFS_LINUX_TRY_COMPILE_SYMBOL([
-		[fs/inode.c],
+		#include <linux/fs.h>
-		[AC_DEFINE(HAVE_CLEAR_INODE, 1,
+	], [
-		[clear_inode() is available])],
+		clear_inode(NULL);
-		[])
+	], [clear_inode], [fs/inode.c], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_CLEAR_INODE, 1, [clear_inode() is available])
+	], [
+		AC_MSG_RESULT(no)
+	])
 ])

config/kernel-d-make-root.m4

@@ -2,11 +2,16 @@ dnl #
 dnl # 3.4.0 API change
 dnl # Added d_make_root() to replace previous d_alloc_root() function.
 dnl #
-AC_DEFUN([ZFS_AC_KERNEL_D_MAKE_ROOT], [
+AC_DEFUN([ZFS_AC_KERNEL_D_MAKE_ROOT],
-	ZFS_CHECK_SYMBOL_EXPORT(
+	[AC_MSG_CHECKING([whether d_make_root() is available])
-		[d_make_root],
+	ZFS_LINUX_TRY_COMPILE_SYMBOL([
-		[fs/dcache.c],
+		#include <linux/dcache.h>
-		[AC_DEFINE(HAVE_D_MAKE_ROOT, 1,
+	], [
-		[d_make_root() is available])],
+		d_make_root(NULL);
-		[])
+	], [d_make_root], [fs/dcache.c], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_D_MAKE_ROOT, 1, [d_make_root() is available])
+	], [
+		AC_MSG_RESULT(no)
+	])
 ])

config/kernel-d-obtain-alias.m4

@@ -2,11 +2,17 @@ dnl #
 dnl # 2.6.28 API change
 dnl # Added d_obtain_alias() helper function.
 dnl #
-AC_DEFUN([ZFS_AC_KERNEL_D_OBTAIN_ALIAS], [
+AC_DEFUN([ZFS_AC_KERNEL_D_OBTAIN_ALIAS],
-	ZFS_CHECK_SYMBOL_EXPORT(
+	[AC_MSG_CHECKING([whether d_obtain_alias() is available])
-		[d_obtain_alias],
+	ZFS_LINUX_TRY_COMPILE_SYMBOL([
-		[fs/dcache.c],
+		#include <linux/dcache.h>
-		[AC_DEFINE(HAVE_D_OBTAIN_ALIAS, 1,
+	], [
-		[d_obtain_alias() is available])],
+		d_obtain_alias(NULL);
-		[])
+	], [d_obtain_alias], [fs/dcache.c], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_D_OBTAIN_ALIAS, 1,
+		          [d_obtain_alias() is available])
+	], [
+		AC_MSG_RESULT(no)
+	])
 ])

config/kernel-get-gendisk.m4

@@ -1,11 +1,17 @@
 dnl #
 dnl # 2.6.34 API change
-dnl # Verify the get_gendisk() symbol is exported.
+dnl # Verify the get_gendisk() symbol is available.
 dnl #
-AC_DEFUN([ZFS_AC_KERNEL_GET_GENDISK], [
+AC_DEFUN([ZFS_AC_KERNEL_GET_GENDISK],
-	ZFS_CHECK_SYMBOL_EXPORT(
+	[AC_MSG_CHECKING([whether get_gendisk() is available])
-		[get_gendisk],
+	ZFS_LINUX_TRY_COMPILE_SYMBOL([
-		[block/genhd.c],
+		#include <linux/genhd.h>
-		[AC_DEFINE(HAVE_GET_GENDISK, 1, [get_gendisk() is available])],
+	], [
-		[])
+		get_gendisk(0, NULL);
+	], [get_gendisk], [block/genhd.c], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_GET_GENDISK, 1, [get_gendisk() is available])
+	], [
+		AC_MSG_RESULT(no)
+	])
 ])

config/kernel-insert-inode-locked.m4

@@ -2,11 +2,17 @@ dnl #
 dnl # 2.6.28 API change
 dnl # Added insert_inode_locked() helper function.
 dnl #
-AC_DEFUN([ZFS_AC_KERNEL_INSERT_INODE_LOCKED], [
+AC_DEFUN([ZFS_AC_KERNEL_INSERT_INODE_LOCKED],
-	ZFS_CHECK_SYMBOL_EXPORT(
+	[AC_MSG_CHECKING([whether insert_inode_locked() is available])
-		[insert_inode_locked],
+	ZFS_LINUX_TRY_COMPILE_SYMBOL([
-		[fs/inode.c],
+		#include <linux/fs.h>
-		[AC_DEFINE(HAVE_INSERT_INODE_LOCKED, 1,
+	], [
-		[insert_inode_locked() is available])],
+		insert_inode_locked(NULL);
-		[])
+	], [insert_inode_locked], [fs/inode.c], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_INSERT_INODE_LOCKED, 1,
+		          [insert_inode_locked() is available])
+	], [
+		AC_MSG_RESULT(no)
+	])
 ])

config/kernel-mount-nodev.m4

@@ -5,11 +5,16 @@ dnl # in the file_system_type structure.  When using the new
 dnl # interface the caller must now use the mount_nodev() helper.
 dnl # This updated callback and helper no longer pass the vfsmount.
 dnl #
-AC_DEFUN([ZFS_AC_KERNEL_MOUNT_NODEV], [
+AC_DEFUN([ZFS_AC_KERNEL_MOUNT_NODEV],
-	ZFS_CHECK_SYMBOL_EXPORT(
+	[AC_MSG_CHECKING([whether mount_nodev() is available])
-		[mount_nodev],
+	ZFS_LINUX_TRY_COMPILE_SYMBOL([
-		[fs/super.c],
+		#include <linux/fs.h>
-		[AC_DEFINE(HAVE_MOUNT_NODEV, 1,
+	], [
-		[mount_nodev() is available])],
+		mount_nodev(NULL, 0, NULL, NULL);
-		[])
+	], [mount_nodev], [fs/super.c], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_MOUNT_NODEV, 1, [mount_nodev() is available])
+	], [
+		AC_MSG_RESULT(no)
+	])
 ])

config/kernel-open-bdev-exclusive.m4

@@ -2,11 +2,17 @@ dnl #
 dnl # 2.6.28 API change
 dnl # open/close_bdev_excl() renamed to open/close_bdev_exclusive()
 dnl #
-AC_DEFUN([ZFS_AC_KERNEL_OPEN_BDEV_EXCLUSIVE], [
+AC_DEFUN([ZFS_AC_KERNEL_OPEN_BDEV_EXCLUSIVE],
-	ZFS_CHECK_SYMBOL_EXPORT(
+	[AC_MSG_CHECKING([whether open_bdev_exclusive() is available])
-		[open_bdev_exclusive],
+	ZFS_LINUX_TRY_COMPILE_SYMBOL([
-		[fs/block_dev.c],
+		#include <linux/fs.h>
-		[AC_DEFINE(HAVE_OPEN_BDEV_EXCLUSIVE, 1,
+	], [
-		[open_bdev_exclusive() is available])],
+		open_bdev_exclusive(NULL, 0, NULL);
-		[])
+	], [open_bdev_exclusive], [fs/block_dev.c], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_OPEN_BDEV_EXCLUSIVE, 1,
+		          [open_bdev_exclusive() is available])
+	], [
+		AC_MSG_RESULT(no)
+	])
 ])

config/kernel-truncate-setsize.m4

@@ -2,11 +2,17 @@ dnl #
 dnl # 2.6.35 API change
 dnl # Added truncate_setsize() helper function.
 dnl #
-AC_DEFUN([ZFS_AC_KERNEL_TRUNCATE_SETSIZE], [
+AC_DEFUN([ZFS_AC_KERNEL_TRUNCATE_SETSIZE],
-	ZFS_CHECK_SYMBOL_EXPORT(
+	[AC_MSG_CHECKING([whether truncate_setsize() is available])
-		[truncate_setsize],
+	ZFS_LINUX_TRY_COMPILE_SYMBOL([
-		[mm/truncate.c],
+		#include <linux/mm.h>
-		[AC_DEFINE(HAVE_TRUNCATE_SETSIZE, 1,
+	], [
-		[truncate_setsize() is available])],
+		truncate_setsize(NULL, 0);
-		[])
+	], [truncate_setsize], [mm/truncate.c], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_TRUNCATE_SETSIZE, 1,
+		          [truncate_setsize() is available])
+	], [
+		AC_MSG_RESULT(no)
+	])
 ])

config/kernel.m4

@@ -4,6 +4,7 @@ dnl #
 AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
 	ZFS_AC_KERNEL
 	ZFS_AC_SPL
+	ZFS_AC_TEST_MODULE
 	ZFS_AC_KERNEL_CONFIG
 	ZFS_AC_KERNEL_BDEV_BLOCK_DEVICE_OPERATIONS
 	ZFS_AC_KERNEL_TYPE_FMODE_T
@@ -86,7 +87,7 @@ 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([test "x$enable_linux_builtin" != xyes -a -f "$modpost"], [
 		AS_IF([grep -q Modules.symvers $modpost], [
 			LINUX_SYMBOLS=Modules.symvers
 		], [
@@ -158,7 +159,7 @@ AC_DEFUN([ZFS_AC_KERNEL], [
 		], [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
+			kernelbuild=${kernelsrc}-obj/${target_cpu}/default
 		], [test -d `dirname ${kernelsrc}`/build-${target_cpu}], [
 			kernelbuild=`dirname ${kernelsrc}`/build-${target_cpu}
 		], [
@@ -191,7 +192,13 @@ AC_DEFUN([ZFS_AC_KERNEL], [
 		])
 	], [
 		AC_MSG_RESULT([Not found])
-		AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
+		if test "x$enable_linux_builtin" != xyes; then
+			AC_MSG_ERROR([*** Cannot find UTS_RELEASE definition.])
+		else
+			AC_MSG_ERROR([
+	*** Cannot find UTS_RELEASE definition.
+	*** Please run 'make prepare' inside the kernel source tree.])
+		fi
 	])
 
 	AC_MSG_RESULT([$kernsrcver])
@@ -312,6 +319,25 @@ AC_DEFUN([ZFS_AC_SPL], [
 	ZFS_AC_SPL_MODULE_SYMVERS
 ])
 
+dnl #
+dnl # Basic toolchain sanity check.
+dnl #
+AC_DEFUN([ZFS_AC_TEST_MODULE],
+	[AC_MSG_CHECKING([whether modules can be built])
+	ZFS_LINUX_TRY_COMPILE([],[],[
+		AC_MSG_RESULT([yes])
+	],[
+		AC_MSG_RESULT([no])
+		if test "x$enable_linux_builtin" != xyes; then
+			AC_MSG_ERROR([*** Unable to build an empty module.])
+		else
+			AC_MSG_ERROR([
+	*** Unable to build an empty module.
+	*** Please run 'make scripts' inside the kernel source tree.])
+		fi
+	])
+])
+
 dnl #
 dnl # Certain kernel build options are not supported.  These must be
 dnl # detected at configure time and cause a build failure.  Otherwise
@@ -418,10 +444,12 @@ dnl # ZFS_LINUX_COMPILE_IFELSE / like AC_COMPILE_IFELSE
 dnl #
 AC_DEFUN([ZFS_LINUX_COMPILE_IFELSE], [
 	m4_ifvaln([$1], [ZFS_LINUX_CONFTEST([$1])])
-	rm -Rf build && mkdir -p build
+	rm -Rf build && mkdir -p build && touch build/conftest.mod.c
 	echo "obj-m := conftest.o" >build/Makefile
+	modpost_flag=''
+	test "x$enable_linux_builtin" = xyes && modpost_flag='modpost=true' # fake modpost stage
 	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])],
+		[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])],
 		[$4],
 		[_AC_MSG_LOG_CONFTEST m4_ifvaln([$5],[$5])]
 	)
@@ -463,30 +491,48 @@ dnl #
 dnl # ZFS_CHECK_SYMBOL_EXPORT
 dnl # check symbol exported or not
 dnl #
-AC_DEFUN([ZFS_CHECK_SYMBOL_EXPORT],
+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], [
+	if test $rc -ne 0; then
 		export=0
 		for file in $2; do
-			grep -q -E "EXPORT_SYMBOL.*($1)" "$LINUX/$file" 2>/dev/null
+			grep -q -E "EXPORT_SYMBOL.*($1)" \
+				"$LINUX/$file" 2>/dev/null
 			rc=$?
-			AS_IF([test $rc -eq 0], [
+			if test $rc -eq 0; then
 				export=1
 				break;
-			])
+			fi
 		done
-		AS_IF([test $export -eq 0], [
+		if test $export -eq 0; then :
-			AC_MSG_RESULT([no])
 			$4
-		], [
+		else :
-			AC_MSG_RESULT([yes])
 			$3
-		])
+		fi
-	], [
+	else :
-		AC_MSG_RESULT([yes])
 		$3
-	])
+	fi
+])
+
+dnl #
+dnl # ZFS_LINUX_TRY_COMPILE_SYMBOL
+dnl # like ZFS_LINUX_TRY_COMPILE, except ZFS_CHECK_SYMBOL_EXPORT
+dnl # is called if not compiling for builtin
+dnl #
+AC_DEFUN([ZFS_LINUX_TRY_COMPILE_SYMBOL], [
+	ZFS_LINUX_TRY_COMPILE([$1], [$2], [rc=0], [rc=1])
+	if test $rc -ne 0; then :
+		$6
+	else
+		if test "x$enable_linux_builtin" != xyes; then
+			ZFS_CHECK_SYMBOL_EXPORT([$3], [$4], [rc=0], [rc=1])
+		fi
+		if test $rc -ne 0; then :
+			$6
+		else :
+			$5
+		fi
+	fi
 ])

config/rpm.am

@@ -1,18 +1,24 @@
 srpm-modules:
+if CONFIG_KERNEL
 	$(MAKE) $(AM_MAKEFLAGS) pkg="${PACKAGE}-modules" srpm-common
+endif
 
 srpm-utils:
+if CONFIG_USER
 	$(MAKE) $(AM_MAKEFLAGS) pkg="${PACKAGE}" srpm-common
+endif
 
 srpm: srpm-modules srpm-utils
 
 rpm-modules: srpm-modules
+if CONFIG_KERNEL
 	$(MAKE) $(AM_MAKEFLAGS) pkg="${PACKAGE}-modules" rpm-common
+endif
 
 rpm-utils: srpm-utils
+if CONFIG_USER
 	$(MAKE) $(AM_MAKEFLAGS) pkg="${PACKAGE}" rpm-common
-
+endif
-rpm-modules: srpm-modules
 
 rpm: rpm-modules rpm-utils
 

config/tgz.am

@@ -8,6 +8,7 @@ tgz-local:
 	fi)
 
 tgz-modules: tgz-local rpm-modules
+if CONFIG_KERNEL
 	name=${PACKAGE}-modules; \
 	version=${ZFS_META_VERSION}-${ZFS_META_RELEASE}; \
 	release=`echo ${LINUX_VERSION} | $(SED) -e "s/-/_/g"`; \
@@ -16,8 +17,10 @@ tgz-modules: tgz-local rpm-modules
 	pkg2=$${name}-devel-$${version}_$${release}.$${arch}.rpm; \
 	fakeroot $(ALIEN) --scripts --to-tgz $$pkg1 $$pkg2; \
 	$(RM) $$pkg1 $$pkg2
+endif
 
 tgz-utils: tgz-local rpm-utils
+if CONFIG_USER
 	name=${PACKAGE}; \
 	version=${ZFS_META_VERSION}-${ZFS_META_RELEASE}; \
 	arch=`$(RPM) -qp $${name}-$${version}.src.rpm --qf %{arch} | tail -1`; \
@@ -26,5 +29,6 @@ tgz-utils: tgz-local rpm-utils
 	pkg3=$${name}-test-$${version}.$${arch}.rpm; \
 	fakeroot $(ALIEN) --scripts --to-tgz $$pkg1 $$pkg2 $$pkg3; \
 	$(RM) $$pkg1 $$pkg2 $$pkg3
+endif
 
 tgz: tgz-modules tgz-utils

config/zfs-build.m4

@@ -73,6 +73,11 @@ AC_DEFUN([ZFS_AC_CONFIG], [
 		AS_HELP_STRING([--with-config=CONFIG],
 		[Config file 'kernel|user|all|srpm']),
 		[ZFS_CONFIG="$withval"])
+	AC_ARG_ENABLE([linux-builtin],
+		[AC_HELP_STRING([--enable-linux-builtin],
+		[Configure for builtin in-tree kernel modules @<:@default=no@:>@])],
+		[],
+		[enable_linux_builtin=no])
 
 	AC_MSG_CHECKING([zfs config])
 	AC_MSG_RESULT([$ZFS_CONFIG]);
@@ -93,11 +98,10 @@ AC_DEFUN([ZFS_AC_CONFIG], [
 	esac
 
 	AM_CONDITIONAL([CONFIG_USER],
-	               [test "$ZFS_CONFIG" = user] ||
+		       [test "$ZFS_CONFIG" = user -o "$ZFS_CONFIG" = all])
-	               [test "$ZFS_CONFIG" = all])
 	AM_CONDITIONAL([CONFIG_KERNEL],
-	               [test "$ZFS_CONFIG" = kernel] ||
+		       [test "$ZFS_CONFIG" = kernel -o "$ZFS_CONFIG" = all] &&
-	               [test "$ZFS_CONFIG" = all])
+		       [test "x$enable_linux_builtin" != xyes ])
 ])
 
 dnl #

copy-builtin

@@ -0,0 +1,121 @@
+#!/bin/bash
+
+set -e
+
+usage()
+{
+	echo "usage: $0 <kernel source tree>" >&2
+	exit 1
+}
+
+[ "$#" -eq 1 ] || usage
+KERNEL_DIR="$(readlink --canonicalize-existing "$1")"
+
+MODULES=()
+for MODULE_DIR in module/*
+do
+	[ -d "$MODULE_DIR" ] || continue
+	MODULES+=("${MODULE_DIR##*/}")
+done
+
+if ! [ -e 'zfs_config.h' ]
+then
+	echo >&2
+	echo "    $0: you did not run configure, or you're not in the ZFS source directory." >&2
+	echo "    $0: run configure with --with-linux=$KERNEL_DIR and --enable-linux-builtin." >&2
+	echo >&2
+	exit 1
+fi
+
+make clean || true
+
+rm -rf "$KERNEL_DIR/include/zfs" "$KERNEL_DIR/fs/zfs"
+cp --recursive include "$KERNEL_DIR/include/zfs"
+cp --recursive module "$KERNEL_DIR/fs/zfs"
+cp zfs_config.h "$KERNEL_DIR/"
+
+adjust_obj_paths()
+{
+	local FILE="$1"
+	local LINE OBJPATH
+
+	while IFS='' read -r LINE
+	do
+		OBJPATH="${LINE#\$(MODULE)-objs += }"
+		if [ "$OBJPATH" = "$LINE" ]
+		then
+			echo "$LINE"
+		else
+			echo "\$(MODULE)-objs += ${OBJPATH##*/}"
+		fi
+	done < "$FILE" > "$FILE.new"
+	mv "$FILE.new" "$FILE"
+}
+
+for MODULE in "${MODULES[@]}"
+do
+	adjust_obj_paths "$KERNEL_DIR/fs/zfs/$MODULE/Makefile"
+done
+
+cat > "$KERNEL_DIR/fs/zfs/Kconfig" <<"EOF"
+config ZFS
+	tristate "ZFS"
+	depends on SPL
+	help
+	  This is the ZFS filesystem from the ZFS On Linux project.
+
+	  See http://zfsonlinux.org/
+
+	  To compile this file system support as a module, choose M here.
+
+	  If unsure, say N.
+EOF
+
+{
+	cat <<-"EOF"
+	ZFS_MODULE_CFLAGS  = -I$(srctree)/include/zfs -I$(srctree)/include/spl 
+	ZFS_MODULE_CFLAGS += -include $(srctree)/spl_config.h -include $(srctree)/zfs_config.h
+	export ZFS_MODULE_CFLAGS
+
+	obj-$(CONFIG_ZFS) :=
+	EOF
+
+	for MODULE in "${MODULES[@]}"
+	do
+		echo 'obj-$(CONFIG_ZFS) += ' "$MODULE/"
+	done
+} > "$KERNEL_DIR/fs/zfs/Kbuild"
+
+add_after()
+{
+	local FILE="$1"
+	local MARKER="$2"
+	local NEW="$3"
+	local LINE
+
+	while IFS='' read -r LINE
+	do
+		echo "$LINE"
+
+		if [ -n "$MARKER" -a "$LINE" = "$MARKER" ]
+		then
+			echo "$NEW"
+			MARKER=''
+			if IFS='' read -r LINE
+			then
+				[ "$LINE" != "$NEW" ] && echo "$LINE"
+			fi
+		fi
+	done < "$FILE" > "$FILE.new"
+
+	mv "$FILE.new" "$FILE"
+}
+
+add_after "$KERNEL_DIR/fs/Kconfig" 'if BLOCK' 'source "fs/zfs/Kconfig"'
+add_after "$KERNEL_DIR/fs/Makefile" 'endif' 'obj-$(CONFIG_ZFS) += zfs/'
+
+echo >&2
+echo "    $0: done." >&2
+echo "    $0: now you can build the kernel with ZFS support." >&2
+echo "    $0: make sure you enable ZFS support (CONFIG_ZFS) before building." >&2
+echo >&2

lib/libzfs/libzfs_util.c

@@ -608,27 +608,13 @@ libzfs_print_on_error(libzfs_handle_t *hdl, boolean_t printerr)
 static int
 libzfs_module_loaded(const char *module)
 {
-	FILE *f;
+	const char path_prefix[] = "/sys/module/";
-	int result = 0;
+	char path[256];
-	char name[256];
 
-	f = fopen("/proc/modules", "r");
+	memcpy(path, path_prefix, sizeof(path_prefix) - 1);
-	if (f == NULL)
+	strcpy(path + sizeof(path_prefix) - 1, module);
-		return -1;
 
-	while (fgets(name, sizeof(name), f)) {
+	return (access(path, F_OK) == 0);
-		char *c = strchr(name, ' ');
-		if (!c)
-			continue;
-		*c = 0;
-		if (strcmp(module, name) == 0) {
-			result = 1;
-			break;
-		}
-	}
-	fclose(f);
-
-	return result;
 }
 
 int

module/Makefile.in

@@ -5,6 +5,11 @@ subdir-m += zcommon
 subdir-m += zfs
 subdir-m += zpios
 
+ZFS_MODULE_CFLAGS += -include @SPL_OBJ@/spl_config.h
+ZFS_MODULE_CFLAGS += -include @abs_top_builddir@/zfs_config.h
+ZFS_MODULE_CFLAGS += -I@abs_top_srcdir@/include -I@SPL@/include -I@SPL@
+export ZFS_MODULE_CFLAGS
+
 modules:
 	@# Make the exported SPL symbols available to these modules.
 	@# They may be in the root of SPL_OBJ when building against
@@ -21,7 +26,7 @@ modules:
 		"*** - @SPL_OBJ@/module/@SPL_SYMBOLS@\n"; \
 		exit 1; \
 	fi
-	$(MAKE) -C @LINUX_OBJ@ SUBDIRS=`pwd` @KERNELMAKE_PARAMS@ $@
+	$(MAKE) -C @LINUX_OBJ@ SUBDIRS=`pwd` @KERNELMAKE_PARAMS@ CONFIG_ZFS=m $@
 
 clean:
 	@# Only cleanup the kernel build directories when CONFIG_KERNEL

module/avl/Makefile.in

@@ -1,10 +1,7 @@
 MODULE := zavl
 
-EXTRA_CFLAGS  = @KERNELCPPFLAGS@
+EXTRA_CFLAGS = $(ZFS_MODULE_CFLAGS) @KERNELCPPFLAGS@
-EXTRA_CFLAGS += -include @SPL_OBJ@/spl_config.h
-EXTRA_CFLAGS += -include @abs_top_builddir@/zfs_config.h
-EXTRA_CFLAGS += -I@abs_top_srcdir@/include -I@SPL@/include -I@SPL@
 
-obj-m := $(MODULE).o
+obj-$(CONFIG_ZFS) := $(MODULE).o
 
 $(MODULE)-objs += @top_srcdir@/module/avl/avl.o

module/nvpair/Makefile.in

@@ -1,11 +1,8 @@
 MODULE := znvpair
 
-EXTRA_CFLAGS  = @KERNELCPPFLAGS@
+EXTRA_CFLAGS = $(ZFS_MODULE_CFLAGS) @KERNELCPPFLAGS@
-EXTRA_CFLAGS += -include @SPL_OBJ@/spl_config.h
-EXTRA_CFLAGS += -include @abs_top_builddir@/zfs_config.h
-EXTRA_CFLAGS += -I@abs_top_srcdir@/include -I@SPL@/include -I@SPL@
 
-obj-m := $(MODULE).o
+obj-$(CONFIG_ZFS) := $(MODULE).o
 
 $(MODULE)-objs += @top_srcdir@/module/nvpair/nvpair.o
 $(MODULE)-objs += @top_srcdir@/module/nvpair/nvpair_alloc_spl.o

module/unicode/Makefile.in

@@ -1,11 +1,8 @@
 MODULE := zunicode
 
-EXTRA_CFLAGS  = @KERNELCPPFLAGS@
+EXTRA_CFLAGS = $(ZFS_MODULE_CFLAGS) @KERNELCPPFLAGS@
-EXTRA_CFLAGS += -include @SPL_OBJ@/spl_config.h
-EXTRA_CFLAGS += -include @abs_top_builddir@/zfs_config.h
-EXTRA_CFLAGS += -I@abs_top_srcdir@/include -I@SPL@/include -I@SPL@
 
-obj-m := $(MODULE).o
+obj-$(CONFIG_ZFS) := $(MODULE).o
 
 $(MODULE)-objs += @top_srcdir@/module/unicode/u8_textprep.o
 $(MODULE)-objs += @top_srcdir@/module/unicode/uconv.o

module/zcommon/Makefile.in

@@ -1,11 +1,8 @@
 MODULE := zcommon
 
-EXTRA_CFLAGS  = @KERNELCPPFLAGS@
+EXTRA_CFLAGS = $(ZFS_MODULE_CFLAGS) @KERNELCPPFLAGS@
-EXTRA_CFLAGS += -include @SPL_OBJ@/spl_config.h
-EXTRA_CFLAGS += -include @abs_top_builddir@/zfs_config.h
-EXTRA_CFLAGS += -I@abs_top_srcdir@/include -I@SPL@/include -I@SPL@
 
-obj-m := $(MODULE).o
+obj-$(CONFIG_ZFS) := $(MODULE).o
 
 $(MODULE)-objs += @top_srcdir@/module/zcommon/zfs_deleg.o
 $(MODULE)-objs += @top_srcdir@/module/zcommon/zfs_prop.o

module/zfs/Makefile.in

@@ -1,11 +1,8 @@
 MODULE := zfs
 
-EXTRA_CFLAGS += @KERNELCPPFLAGS@
+EXTRA_CFLAGS = $(ZFS_MODULE_CFLAGS) @KERNELCPPFLAGS@
-EXTRA_CFLAGS += -include @SPL_OBJ@/spl_config.h
-EXTRA_CFLAGS += -include @abs_top_builddir@/zfs_config.h
-EXTRA_CFLAGS += -I@abs_top_srcdir@/include -I@SPL@/include -I@SPL@
 
-obj-m := $(MODULE).o
+obj-$(CONFIG_ZFS) := $(MODULE).o
 
 $(MODULE)-objs += @top_srcdir@/module/zfs/arc.o
 $(MODULE)-objs += @top_srcdir@/module/zfs/bplist.o

module/zpios/Makefile.in

@@ -1,10 +1,7 @@
 MODULE := zpios
 
-EXTRA_CFLAGS  = @KERNELCPPFLAGS@
+EXTRA_CFLAGS = $(ZFS_MODULE_CFLAGS) @KERNELCPPFLAGS@
-EXTRA_CFLAGS += -include @SPL_OBJ@/spl_config.h
-EXTRA_CFLAGS += -include @abs_top_builddir@/zfs_config.h
-EXTRA_CFLAGS += -I@abs_top_srcdir@/include -I@SPL@/include -I@SPL@
 
-obj-m := $(MODULE).o
+obj-$(CONFIG_ZFS) := $(MODULE).o
 
 $(MODULE)-objs += @top_srcdir@/module/zpios/pios.o