initial buildroot for linux 5.15

fs/ext2/ext2.mk

@@ -0,0 +1,46 @@
+################################################################################
+#
+# Build the ext2 root filesystem image
+#
+################################################################################
+
+ROOTFS_EXT2_SIZE = $(call qstrip,$(BR2_TARGET_ROOTFS_EXT2_SIZE))
+ifeq ($(BR2_TARGET_ROOTFS_EXT2)-$(ROOTFS_EXT2_SIZE),y-)
+$(error BR2_TARGET_ROOTFS_EXT2_SIZE cannot be empty)
+endif
+
+ROOTFS_EXT2_MKFS_OPTS = $(call qstrip,$(BR2_TARGET_ROOTFS_EXT2_MKFS_OPTIONS))
+
+# qstrip results in stripping consecutive spaces into a single one. So the
+# variable is not qstrip-ed to preserve the integrity of the string value.
+ROOTFS_EXT2_LABEL = $(subst ",,$(BR2_TARGET_ROOTFS_EXT2_LABEL))
+#" Syntax highlighting... :-/ )
+
+ROOTFS_EXT2_OPTS = \
+	-d $(TARGET_DIR) \
+	-r $(BR2_TARGET_ROOTFS_EXT2_REV) \
+	-N $(BR2_TARGET_ROOTFS_EXT2_INODES) \
+	-m $(BR2_TARGET_ROOTFS_EXT2_RESBLKS) \
+	-L "$(ROOTFS_EXT2_LABEL)" \
+	$(ROOTFS_EXT2_MKFS_OPTS)
+
+ROOTFS_EXT2_DEPENDENCIES = host-e2fsprogs
+
+define ROOTFS_EXT2_CMD
+	rm -f $@
+	$(HOST_DIR)/sbin/mkfs.ext$(BR2_TARGET_ROOTFS_EXT2_GEN) $(ROOTFS_EXT2_OPTS) $@ \
+		"$(ROOTFS_EXT2_SIZE)" \
+	|| { ret=$$?; \
+	     echo "*** Maybe you need to increase the filesystem size (BR2_TARGET_ROOTFS_EXT2_SIZE)" 1>&2; \
+	     exit $$ret; \
+	}
+endef
+
+ifneq ($(BR2_TARGET_ROOTFS_EXT2_GEN),2)
+define ROOTFS_EXT2_SYMLINK
+	ln -sf rootfs.ext2$(ROOTFS_EXT2_COMPRESS_EXT) $(BINARIES_DIR)/rootfs.ext$(BR2_TARGET_ROOTFS_EXT2_GEN)$(ROOTFS_EXT2_COMPRESS_EXT)
+endef
+ROOTFS_EXT2_POST_GEN_HOOKS += ROOTFS_EXT2_SYMLINK
+endif
+
+$(eval $(rootfs))