add dkms support

Signed-off-by: Frederik Schwan <frederik@tty42.de>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Makefile

@@ -2,6 +2,7 @@ VERSION=$(shell cargo metadata --format-version 1 | jq -r '.packages[] | select(
 
 PREFIX?=/usr/local
 LIBEXECDIR?=$(PREFIX)/libexec
+DKMSDIR?=$(PREFIX)/src/bcachefs-$(VERSION)
 PKG_CONFIG?=pkg-config
 INSTALL=install
 LN=ln
@@ -224,6 +225,16 @@ install_systemd: $(systemd_services) $(systemd_libexecfiles)
 	$(INSTALL) -m0755 -D $(systemd_libexecfiles) -t $(DESTDIR)$(LIBEXECDIR)
 	$(INSTALL) -m0644 -D $(systemd_services) -t $(DESTDIR)$(PKGCONFIG_SERVICEDIR)
 
+.PHONY: install_dkms
+install_dkms:
+	$(INSTALL) -m0644 -D dkms/Makefile         -t $(DESTDIR)$(DKMSDIR)
+	$(INSTALL) -m0644 -D dkms/dkms.conf        -t $(DESTDIR)$(DKMSDIR)
+	$(INSTALL) -m0644 -D libbcachefs/Makefile  -t $(DESTDIR)$(DKMSDIR)/src/fs/bcachefs
+	$(INSTALL) -m0644 -D libbcachefs/*.[ch]    -t $(DESTDIR)$(DKMSDIR)/src/fs/bcachefs
+	sed -i "s|@PACKAGE_VERSION@|$(VERSION)|g" $(DESTDIR)$(DKMSDIR)/dkms.conf
+	sed -i "s|^#define TRACE_INCLUDE_PATH \\.\\./\\.\\./fs/bcachefs$$|#define TRACE_INCLUDE_PATH $(DKMSDIR)/src/fs/bcachefs|" \
+	  $(DESTDIR)$(DKMSDIR)/src/fs/bcachefs/trace.h
+
 .PHONY: clean
 clean:
 	@echo "Cleaning all"

dkms/Makefile

@@ -0,0 +1,12 @@
+ifneq (${KERNELRELEASE},)
+ccflags-y := -I$(src)/include
+obj-m += src/fs/bcachefs/
+else
+KDIR ?= /lib/modules/`uname -r`/build
+
+default:
+        $(MAKE) -C $(KDIR) M=$$PWD modules
+
+clean:
+        $(MAKE) -C $(KDIR) M=$$PWD clean
+endif

dkms/dkms.conf

@@ -0,0 +1,5 @@
+PACKAGE_NAME="bcachefs"
+PACKAGE_VERSION="@PACKAGE_VERSION@"
+BUILT_MODULE_NAME[0]="bcachefs"
+BUILT_MODULE_LOCATION[0]="src/fs/bcachefs"
+DEST_MODULE_LOCATION[0]="/kernel/fs/bcachefs"

libbcachefs/Makefile

@@ -0,0 +1,107 @@
+
+obj-$(CONFIG_BCACHEFS_FS)	+= bcachefs.o
+
+bcachefs-y		:=	\
+	acl.o			\
+	alloc_background.o	\
+	alloc_foreground.o	\
+	backpointers.o		\
+	bkey.o			\
+	bkey_methods.o		\
+	bkey_sort.o		\
+	bset.o			\
+	btree_cache.o		\
+	btree_gc.o		\
+	btree_io.o		\
+	btree_iter.o		\
+	btree_journal_iter.o	\
+	btree_key_cache.o	\
+	btree_locking.o		\
+	btree_node_scan.o	\
+	btree_trans_commit.o	\
+	btree_update.o		\
+	btree_update_interior.o	\
+	btree_write_buffer.o	\
+	buckets.o		\
+	buckets_waiting_for_journal.o	\
+	chardev.o		\
+	checksum.o		\
+	clock.o			\
+	compress.o		\
+	darray.o		\
+	data_update.o		\
+	debug.o			\
+	dirent.o		\
+	disk_accounting.o	\
+	disk_groups.o		\
+	ec.o			\
+	enumerated_ref.o	\
+	errcode.o		\
+	error.o			\
+	extents.o		\
+	extent_update.o		\
+	eytzinger.o		\
+	fast_list.o		\
+	fs.o			\
+	fs-ioctl.o		\
+	fs-io.o			\
+	fs-io-buffered.o	\
+	fs-io-direct.o		\
+	fs-io-pagecache.o	\
+	fsck.o			\
+	inode.o			\
+	io_read.o		\
+	io_misc.o		\
+	io_write.o		\
+	journal.o		\
+	journal_io.o		\
+	journal_reclaim.o	\
+	journal_sb.o		\
+	journal_seq_blacklist.o	\
+	keylist.o		\
+	logged_ops.o		\
+	lru.o			\
+	mean_and_variance.o	\
+	migrate.o		\
+	move.o			\
+	movinggc.o		\
+	namei.o			\
+	nocow_locking.o		\
+	opts.o			\
+	printbuf.o		\
+	progress.o		\
+	quota.o			\
+	rebalance.o		\
+	rcu_pending.o		\
+	recovery.o		\
+	recovery_passes.o	\
+	reflink.o		\
+	replicas.o		\
+	sb-clean.o		\
+	sb-counters.o		\
+	sb-downgrade.o		\
+	sb-errors.o		\
+	sb-members.o		\
+	siphash.o		\
+	six.o			\
+	snapshot.o		\
+	str_hash.o		\
+	subvolume.o		\
+	super.o			\
+	super-io.o		\
+	sysfs.o			\
+	tests.o			\
+	time_stats.o		\
+	thread_with_file.o	\
+	trace.o			\
+	two_state_shared_lock.o	\
+	util.o			\
+	varint.o		\
+	xattr.o
+
+bcachefs-$(CONFIG_BCACHEFS_ASYNC_OBJECT_LISTS)   += async_objs.o
+
+obj-$(CONFIG_MEAN_AND_VARIANCE_UNIT_TEST)   += mean_and_variance_test.o
+
+# Silence "note: xyz changed in GCC X.X" messages
+subdir-ccflags-y += $(call cc-disable-warning, psabi)