Add VBFS: VirtualBox Shared Folder File System

Refer to "man vbfs" on how to mount it.

servers/vbfs/Makefile

@@ -0,0 +1,12 @@
+# Makefile for VirtualBox Shared Folders File System (VBFS) server
+PROG=	vbfs
+SRCS=	vbfs.c
+
+DPADD+=	${LIBSFFS} ${LIBVBOXFS} ${LIBSYS}
+LDADD+=	-lsffs -lvboxfs -lsys
+
+MAN=
+
+BINDIR?= /sbin
+
+.include <minix.service.mk>

servers/vbfs/vbfs.c

@@ -0,0 +1,141 @@
+/* This file contains the implementation of the VBFS file system server. */
+/*
+ * The architecture of VBFS can be sketched as follows:
+ *
+ *     +-------------+
+ *     |    VBFS     |		This file
+ *     +-------------+
+ *            |
+ *     +-------------+
+ *     |   libsffs   |		Shared Folder File System library
+ *     +-------------+
+ *            |
+ *     +-------------+
+ *     |  libvboxfs  |		VirtualBox File System library
+ *     +-------------+
+ *            |
+ *     +-------------+
+ *     | libsys/vbox |		VBOX driver interfacing library
+ *     +-------------+
+ *  --------  |  -------- 		(process boundary)
+ *     +-------------+
+ *     | VBOX driver |		VirtualBox backdoor driver
+ *     +-------------+
+ *  ========  |  ======== 		(system boundary)
+ *     +-------------+
+ *     | VirtualBox  |		The host system
+ *     +-------------+
+ *
+ * The interfaces between the layers are defined in the following header files:
+ *   minix/sffs.h:	shared between VBFS, libsffs, and libvboxfs
+ *   minix/vboxfs.h:	shared between VBFS and libvboxfs
+ *   minix/vbox.h:	shared between libvboxfs and libsys/vbox
+ *   minix/vboxtype.h:	shared between libvboxfs, libsys/vbox, and VBOX
+ *   minix/vboxif.h:	shared between libsys/vbox and VBOX
+ */
+
+#include <minix/drivers.h>
+#include <minix/sffs.h>
+#include <minix/vboxfs.h>
+#include <minix/optset.h>
+
+static char share[PATH_MAX];
+static struct sffs_params params;
+
+static struct optset optset_table[] = {
+	{ "share",  OPT_STRING, share,               sizeof(share)           },
+	{ "prefix", OPT_STRING, params.p_prefix,     sizeof(params.p_prefix) },
+	{ "uid",    OPT_INT,    &params.p_uid,       10                      },
+	{ "gid",    OPT_INT,    &params.p_gid,       10                      },
+	{ "fmask",  OPT_INT,    &params.p_file_mask, 8                       },
+	{ "dmask",  OPT_INT,    &params.p_dir_mask,  8                       },
+	{ NULL,     0,          NULL,                0                       }
+};
+
+/*
+ * Initialize this file server. Called at startup time.
+ */
+static int
+init(int UNUSED(type), sef_init_info_t *UNUSED(info))
+{
+	const struct sffs_table *table;
+	int i, r, roflag;
+
+	/* Set defaults. */
+	share[0] = 0;
+	params.p_prefix[0] = 0;
+	params.p_uid = 0;
+	params.p_gid = 0;
+	params.p_file_mask = 0755;
+	params.p_dir_mask = 0755;
+	params.p_case_insens = FALSE;
+
+	/* We must have been given an options string. Parse the options. */
+	for (i = 1; i < env_argc - 1; i++)
+		if (!strcmp(env_argv[i], "-o"))
+			optset_parse(optset_table, env_argv[++i]);
+
+	/* A share name is required. */
+	if (!share[0]) {
+		printf("VBFS: no shared folder share name specified\n");
+
+		return EINVAL;
+	}
+
+	/* Initialize the VBOXFS library. If this fails, exit immediately. */
+	r = vboxfs_init(share, &table, &params.p_case_insens, &roflag);
+
+	if (r != OK) {
+		if (r == ENOENT)
+			printf("VBFS: the given share does not exist\n");
+		else
+			printf("VBFS: unable to initialize VBOXFS (%d)\n", r);
+
+		return r;
+	}
+
+	/* Now initialize the SFFS library. */
+	if ((r = sffs_init("VBFS", table, &params)) != OK) {
+		vboxfs_cleanup();
+
+		return r;
+	}
+
+	return OK;
+}
+
+/*
+ * Local SEF initialization.
+ */
+static void
+sef_local_startup(void)
+{
+
+	/* Register initialization callback. */
+	sef_setcb_init_fresh(init);
+
+	/* Register signal callback. SFFS handles this. */
+	sef_setcb_signal_handler(sffs_signal);
+
+	sef_startup();
+}
+
+/*
+ * The main function of this file server.
+ */
+int
+main(int argc, char **argv)
+{
+
+	/* Start up. */
+	env_setargs(argc, argv);
+	sef_local_startup();
+
+	/* Let SFFS do the actual work. */
+	sffs_loop();
+
+	/* Clean up. */
+	vboxfs_cleanup();
+
+	return EXIT_SUCCESS;
+}