[PATCH 7/9] exofs: mkexofs

[Boaz Harrosh <bharrosh@panasas.com>]

We need a mechanism to prepare the file system (mkfs).
I chose to implement that by means of a couple of
mount-options. Because there is no user-mode API for committing
OSD commands. And also, all this stuff is highly internal to
the file system itself.

- Added two mount options mkfs=0/1,format=capacity_in_meg, so mkfs/format
  can be executed by kernel code just before mount. An mkexofs utility
  can now be implemented by means of a script that mounts and unmount the
  file system with proper options.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
---
 fs/exofs/Kbuild    |    2 +-
 fs/exofs/exofs.h   |    3 +
 fs/exofs/mkexofs.c |  605 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 fs/exofs/super.c   |   18 ++
 4 files changed, 627 insertions(+), 1 deletions(-)
 create mode 100644 fs/exofs/mkexofs.c

diff --git a/fs/exofs/Kbuild b/fs/exofs/Kbuild
index e293cb9..639c181 100644
--- a/fs/exofs/Kbuild
+++ b/fs/exofs/Kbuild
@@ -26,5 +26,5 @@ KBUILD_CPPFLAGS := -I$(OSD_INC) $(KBUILD_CPPFLAGS)
 
 endif
 
-exofs-objs := osd.o inode.o file.o symlink.o namei.o dir.o super.o
+exofs-objs := osd.o inode.o file.o symlink.o namei.o dir.o super.o mkexofs.o
 obj-$(CONFIG_EXOFS_FS) += exofs.o
diff --git a/fs/exofs/exofs.h b/fs/exofs/exofs.h
index 75c608d..f53d18b 100644
--- a/fs/exofs/exofs.h
+++ b/fs/exofs/exofs.h
@@ -204,6 +204,9 @@ int extract_list_from_req(struct osd_request *req,
 
 void free_osd_req(struct osd_request *req);
 
+/* mkexofs.c             */
+int exofs_mkfs(struct osd_dev *dev, uint64_t p_id, uint64_t format_size);
+
 /* inode.c               */
 void exofs_truncate(struct inode *inode);
 extern struct inode *exofs_iget(struct super_block *, unsigned long);
diff --git a/fs/exofs/mkexofs.c b/fs/exofs/mkexofs.c
new file mode 100644
index 0000000..79df3e3
--- /dev/null
+++ b/fs/exofs/mkexofs.c
@@ -0,0 +1,605 @@
+/*
+ * mkexofs.c - make an exofs file system.
+ *
+ * Copyright (C) 2005, 2006
+ * Avishay Traeger (avishay@gmail.com) (avishay@il.ibm.com)
+ * Copyright (C) 2005, 2006
+ * International Business Machines
+ *
+ * Copyrights from mke2fs.c:
+ *     Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
+ *     2003, 2004, 2005 by Theodore Ts'o.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "exofs.h"
+#include <linux/random.h>
+
+/* #define __MKEXOFS_DEBUG_CHECKS 1 */
+
+static int kick_it(struct osd_request *req, int timeout, uint8_t *cred_a,
+		   const char *op)
+{
+	return exofs_sync_op(req, timeout, cred_a);
+}
+
+/* Format the LUN to the specified size */
+static int format(uint64_t lun_capacity, struct osd_dev *dev, int timeout)
+{
+	struct osd_request *req = prepare_osd_format_lun(dev, lun_capacity);
+	uint8_t cred_a[OSD_CAP_LEN];
+	int ret;
+
+	make_credential(cred_a, 0, 0);
+
+	if (req == NULL) {
+		EXOFS_ERR("ERROR: Failed to allocate request.\n");
+		return -ENOMEM;
+	}
+
+	ret = kick_it(req, timeout, cred_a, "format");
+
+	free_osd_req(req);
+
+	return ret;
+}
+
+static int create_partition(struct osd_dev *dev, uint64_t p_id, int timeout)
+{
+	struct osd_request *req;
+	uint8_t cred_a[OSD_CAP_LEN];
+	bool try_remove = false;
+	int ret;
+
+	make_credential(cred_a, p_id, 0);
+
+create_part:
+	req = prepare_osd_create_partition(dev, p_id);
+	if (!req)
+		return -ENOMEM;
+	ret = kick_it(req, timeout, cred_a, "create partition");
+	free_osd_req(req);
+
+	if (ret && !try_remove) {
+		try_remove = true;
+		req = prepare_osd_remove_partition(dev, p_id);
+		if (!req)
+			return -ENOMEM;
+		ret = kick_it(req, timeout, cred_a, "remove partition");
+		free_osd_req(req);
+		if (!ret) /* Try again now */
+			goto create_part;
+	}
+
+	return ret;
+}
+
+#ifdef __MKEXOFS_DEBUG_CHECKS
+static int list(struct osd_dev *dev, uint64_t p_id, int timeout)
+{
+	struct osd_request *req;
+	uint8_t cred_a[OSD_CAP_LEN];
+	unsigned char *buf = NULL;
+	int ret;
+	uint64_t total_matches;
+	uint64_t total_ret;
+	uint64_t *id_list;
+	int is_part, is_utd;
+	uint64_t cont;
+	uint32_t more;
+	int i;
+
+	buf = kzalloc(1024, GFP_KERNEL);
+	if (!buf) {
+		EXOFS_ERR("ERROR: Failed to allocate memory.\n");
+		return -ENOMEM;
+	}
+
+	make_credential(cred_a, p_id, 0);
+
+	req = prepare_osd_list(dev, p_id, 0, 1024, 0, 0, buf);
+	if (req == NULL) {
+		EXOFS_ERR("ERROR: Failed to allocate request.\n");
+		return -ENOMEM;
+	}
+
+	ret = kick_it(req, timeout, cred_a, "list");
+	if (ret != 0)
+		goto out;
+
+	ret = extract_list_from_req(req, &total_matches, &total_ret, &id_list,
+				    &is_part, &is_utd, &cont, &more);
+
+	EXOFS_DBGMSG("created %llu objects:\n", _LLU(total_ret));
+	for (i = 0 ; i < total_ret ; i++)
+		EXOFS_DBGMSG("%llu\n", _LLU(id_list[i]));
+
+out:
+	free_osd_req(req);
+	kfree(buf);
+
+	return ret;
+}
+#endif
+
+static int create(struct osd_dev *dev, uint64_t p_id, uint64_t o_id,
+		  int timeout)
+{
+	struct osd_request *req;
+	uint8_t cred_a[OSD_CAP_LEN];
+	int ret;
+
+	make_credential(cred_a, p_id, o_id);
+	req = prepare_osd_create(dev, p_id, o_id);
+
+	if (req == NULL) {
+		EXOFS_ERR("ERROR: Failed to allocate request.\n");
+		return -ENOMEM;
+	}
+
+	ret = kick_it(req, timeout, cred_a, "create");
+
+	free_osd_req(req);
+
+	return ret;
+}
+
+static int write_super(struct osd_dev *dev, uint64_t p_id, int timeout,
+		       int newfile)
+{
+	struct osd_request *req;
+	uint8_t cred_a[OSD_CAP_LEN];
+	struct exofs_fscb data;
+	int ret;
+
+	make_credential(cred_a, p_id, EXOFS_SUPER_ID);
+
+	data.s_nextid = 4;
+	data.s_magic = EXOFS_SUPER_MAGIC;
+	data.s_newfs = 1;
+	if (newfile)
+		data.s_numfiles = 1;
+	else
+		data.s_numfiles = 0;
+
+	req = prepare_osd_write(dev, p_id, EXOFS_SUPER_ID,
+				sizeof(struct exofs_fscb), 0, 0,
+				(unsigned char *)(&data));
+
+	if (req == NULL) {
+		EXOFS_ERR("ERROR: Failed to allocate request.\n");
+		return -ENOMEM;
+	}
+
+	ret = kick_it(req, timeout, cred_a, "write super");
+
+	free_osd_req(req);
+
+	return ret;
+}
+
+#ifdef __MKEXOFS_DEBUG_CHECKS
+static int read_super(struct osd_dev *dev, uint64_t p_id, int timeout)
+{
+	struct osd_request *req;
+	uint8_t cred_a[OSD_CAP_LEN];
+	struct exofs_fscb data;
+	int ret;
+
+	make_credential(cred_a, p_id, EXOFS_SUPER_ID);
+
+	req = prepare_osd_read(dev, p_id, EXOFS_SUPER_ID,
+				sizeof(struct exofs_fscb), 0, 0,
+				(unsigned char *)(&data));
+
+	if (req == NULL) {
+		EXOFS_ERR("ERROR: Failed to allocate request.\n");
+		return -ENOMEM;
+	}
+
+	ret = kick_it(req, timeout, cred_a, "read super");
+	if (ret)
+		goto out;
+
+	EXOFS_DBGMSG("nextid:\t%u\n", data.s_nextid);
+	EXOFS_DBGMSG("magic:\t%u\n", data.s_magic);
+	EXOFS_DBGMSG("numfiles:\t%u\n", data.s_numfiles);
+out:
+	free_osd_req(req);
+
+	return ret;
+}
+#endif
+
+static int write_bitmap(struct osd_dev *dev, uint64_t p_id, int timeout)
+{
+	struct osd_request *req;
+	uint8_t cred_a[OSD_CAP_LEN];
+	uint64_t off = 0;
+	unsigned int id = 3;
+	int ret;
+
+	/* XXX: For now just use counter - later make bitmap */
+	make_credential(cred_a, p_id, EXOFS_BM_ID);
+
+	req = prepare_osd_write(dev, p_id, EXOFS_BM_ID, sizeof(unsigned int),
+				off, 0, (unsigned char *)&id);
+	if (req == NULL) {
+		EXOFS_ERR("ERROR: Failed to allocate request.\n");
+		return -ENOMEM;
+	}
+
+	ret = kick_it(req, timeout, cred_a, "write bitmap");
+
+	free_osd_req(req);
+
+	return ret;
+}
+
+#ifdef __MKEXOFS_DEBUG_CHECKS
+static int write_testfile(struct osd_dev *dev, uint64_t p_id, int timeout)
+{
+	struct osd_request *req;
+	uint8_t cred_a[OSD_CAP_LEN];
+	uint64_t off = 0;
+	unsigned char buf[64];
+	int ret;
+
+	strcpy((char *)buf, "This file is a test, it is only a test.");
+	make_credential(cred_a, p_id, EXOFS_TEST_ID);
+
+	req = prepare_osd_write(dev, p_id, EXOFS_TEST_ID, 64, off, 0, buf);
+
+	if (req == NULL) {
+		EXOFS_ERR("ERROR: Failed to allocate request.\n");
+		return -ENOMEM;
+	}
+
+	ret = kick_it(req, timeout, cred_a, "write bitmap");
+
+	free_osd_req(req);
+
+	return ret;
+}
+
+static int read_testfile(struct osd_dev *dev, uint64_t p_id, int timeout)
+{
+	struct osd_request *req;
+	uint8_t cred_a[OSD_CAP_LEN];
+	unsigned char data[64];
+	int ret;
+
+	make_credential(cred_a, p_id, EXOFS_TEST_ID);
+
+	req = prepare_osd_read(dev, p_id, EXOFS_TEST_ID, 64, 0, 0, data);
+
+	if (req == NULL) {
+		EXOFS_ERR("ERROR: Failed to allocate request.\n");
+		return -ENOMEM;
+	}
+
+	ret = kick_it(req, timeout, cred_a, "read test file");
+	if (ret)
+		goto out;
+
+	EXOFS_DBGMSG("test file: %s\n", data);
+
+out:
+	free_osd_req(req);
+
+	return ret;
+}
+#endif
+
+static int write_rootdir(struct osd_dev *dev, uint64_t p_id, int timeout,
+			 int newfile)
+{
+	struct osd_request *req;
+	uint8_t cred_a[OSD_CAP_LEN];
+	struct exofs_dir_entry *dir;
+	uint64_t off = 0;
+	unsigned char *buf = NULL;
+	int filetype = EXOFS_FT_DIR << 8;
+	int filetype2 = EXOFS_FT_REG_FILE << 8;
+	int rec_len;
+	int done;
+	int ret;
+
+	buf = kzalloc(EXOFS_BLKSIZE, GFP_KERNEL);
+	if (!buf) {
+		EXOFS_ERR("ERROR: Failed to allocate memory.\n");
+		return -ENOMEM;
+	}
+	dir = (struct exofs_dir_entry *)buf;
+
+	/* create entry for '.' */
+	dir->name[0] = '.';
+	dir->name_len = 1 | filetype;
+	dir->inode = EXOFS_ROOT_ID - EXOFS_OBJ_OFF;
+	dir->rec_len = EXOFS_DIR_REC_LEN(1);
+	rec_len = EXOFS_BLKSIZE - EXOFS_DIR_REC_LEN(1);
+
+	/* create entry for '..' */
+	dir = (struct exofs_dir_entry *) (buf + dir->rec_len);
+	dir->name[0] = '.';
+	dir->name[1] = '.';
+	dir->name_len = 2 | filetype;
+	dir->inode = EXOFS_ROOT_ID - EXOFS_OBJ_OFF;
+	if (newfile) {
+		rec_len -= EXOFS_DIR_REC_LEN(2);
+		dir->rec_len = EXOFS_DIR_REC_LEN(2);
+	} else
+		dir->rec_len = rec_len;
+	done = EXOFS_DIR_REC_LEN(1) + dir->rec_len;
+
+	/* create entry for 'test', if specified */
+	if (newfile) {
+		dir = (struct exofs_dir_entry *) (buf + done);
+		dir->inode = EXOFS_TEST_ID - EXOFS_OBJ_OFF;
+		dir->name_len = 4 | filetype2;
+		dir->name[0] = 't';
+		dir->name[1] = 'e';
+		dir->name[2] = 's';
+		dir->name[3] = 't';
+		dir->rec_len = rec_len;
+	}
+
+	make_credential(cred_a, p_id, EXOFS_ROOT_ID);
+
+	req = prepare_osd_write(dev, p_id, EXOFS_ROOT_ID, EXOFS_BLKSIZE, off,
+				0, buf);
+
+	if (req == NULL) {
+		EXOFS_ERR("ERROR: Failed to allocate request.\n");
+		return -ENOMEM;
+	}
+
+	ret = kick_it(req, timeout, cred_a, "write rootdir");
+
+	free_osd_req(req);
+
+	return ret;
+}
+
+static int set_inode(struct osd_dev *dev, uint64_t p_id, int timeout,
+		     uint64_t o_id, uint16_t mode)
+{
+	struct osd_request *req;
+	uint8_t cred_a[OSD_CAP_LEN];
+	struct exofs_fcb in = {0};
+	struct exofs_fcb *inode = &in;
+	uint32_t i_generation;
+	int ret;
+
+	inode->i_mode = cpu_to_be16(mode);
+	inode->i_uid = inode->i_gid = 0;
+	inode->i_links_count = cpu_to_be16(2);
+	inode->i_ctime = inode->i_atime = inode->i_mtime =
+					cpu_to_be32(CURRENT_TIME.tv_sec);
+	inode->i_size = cpu_to_be64(EXOFS_BLKSIZE);
+	if (o_id != EXOFS_ROOT_ID)
+		inode->i_size = cpu_to_be64(64);
+
+	get_random_bytes(&i_generation, sizeof(i_generation));
+	inode->i_generation = cpu_to_be32(i_generation);
+
+	make_credential(cred_a, p_id, o_id);
+
+	req = prepare_osd_set_attr(dev, p_id, o_id);
+
+	if (req == NULL) {
+		EXOFS_ERR("ERROR: Failed to allocate request.\n");
+		return -ENOMEM;
+	}
+
+	prepare_set_attr_list_add_entry(req,
+			OSD_PAGE_NUM_IBM_UOBJ_FS_DATA,
+			OSD_ATTR_NUM_IBM_UOBJ_FS_DATA_INODE,
+			EXOFS_INO_ATTR_SIZE,
+			(unsigned char *)inode);
+
+	ret = kick_it(req, timeout, cred_a, "set inode");
+
+	free_osd_req(req);
+
+	return ret;
+}
+
+#ifdef __MKEXOFS_DEBUG_CHECKS
+static int get_root_attr(struct osd_dev *dev, uint64_t p_id, int timeout)
+{
+	struct osd_request *req;
+	uint8_t cred_a[OSD_CAP_LEN];
+	struct exofs_fcb in = {0};
+	struct exofs_fcb *inode = &in;
+	uint32_t page = OSD_PAGE_NUM_IBM_UOBJ_FS_DATA;
+	uint32_t attr = OSD_ATTR_NUM_IBM_UOBJ_FS_DATA_INODE;
+	uint16_t expected = EXOFS_INO_ATTR_SIZE;
+	uint8_t *buf;
+	int ret;
+
+	make_credential(cred_a, p_id, EXOFS_ROOT_ID);
+
+	req = prepare_osd_get_attr(dev, p_id, EXOFS_ROOT_ID);
+	if (req == NULL) {
+		EXOFS_ERR("ERROR: Failed to allocate request.\n");
+		return -ENOMEM;
+	}
+
+	prepare_get_attr_list_add_entry(req,
+			OSD_PAGE_NUM_IBM_UOBJ_FS_DATA,
+			OSD_ATTR_NUM_IBM_UOBJ_FS_DATA_INODE,
+			EXOFS_INO_ATTR_SIZE);
+
+	ret = kick_it(req, timeout, cred_a, "get root inode");
+	if (ret)
+		goto out;
+
+	ret = extract_next_attr_from_req(req, &page, &attr, &expected, &buf);
+	if (ret) {
+		EXOFS_ERR("ERROR: extract attr from req failed\n");
+		goto out;
+	}
+
+	memcpy(inode, buf, sizeof(struct exofs_fcb));
+
+	EXOFS_DBGMSG("mode: %u\n", be16_to_cpu(inode->i_mode));
+	EXOFS_DBGMSG("uid: %u\n", be32_to_cpu(inode->i_uid));
+	EXOFS_DBGMSG("gid: %u\n", be32_to_cpu(inode->i_gid));
+	EXOFS_DBGMSG("links: %u\n", be16_to_cpu(inode->i_links_count));
+	EXOFS_DBGMSG("ctime: %u\n", be32_to_cpu(inode->i_ctime));
+	EXOFS_DBGMSG("atime: %u\n", be32_to_cpu(inode->i_atime));
+	EXOFS_DBGMSG("mtime: %u\n", be32_to_cpu(inode->i_mtime));
+	EXOFS_DBGMSG("gen: %u\n", be32_to_cpu(inode->i_generation));
+	EXOFS_DBGMSG("size: %llu\n", _LLU(be64_to_cpu(inode->i_size)));
+
+out:
+	free_osd_req(req);
+
+	return ret;
+}
+#endif
+
+/*
+ * This function creates an exofs file system on the specified OSD partition.
+ */
+int exofs_mkfs(struct osd_dev *dev, uint64_t p_id, uint64_t format_size_meg)
+{
+	int err;
+	const int to_format = (4 * 60 * HZ);
+	const int to_gen = (60 * HZ);
+	bool newfile = false;
+
+	/* Get a handle */
+	EXOFS_DBGMSG("setting up exofs on partition %llu:\n", _LLU(p_id));
+
+	/* Format LUN if requested */
+	if (format_size_meg > 0) {
+		EXOFS_DBGMSG("formatting %llu Mgb...\n", _LLU(format_size_meg));
+		err = format(format_size_meg * 1024 * 1024, dev, to_format);
+		if (err)
+			goto out;
+		EXOFS_DBGMSG(" OK\n");
+	}
+
+	/* Create partition */
+	EXOFS_DBGMSG("creating partition...\n");
+	err = create_partition(dev, p_id, to_gen);
+	if (err)
+		goto out;
+	EXOFS_DBGMSG(" OK\n");
+
+	/* Create object with known ID for superblock info */
+	EXOFS_DBGMSG("creating superblock...\n");
+	err = create(dev, p_id, EXOFS_SUPER_ID, to_gen);
+	if (err)
+		goto out;
+	EXOFS_DBGMSG(" OK\n");
+
+	/* Create root directory object */
+	EXOFS_DBGMSG("creating root directory...\n");
+	err = create(dev, p_id, EXOFS_ROOT_ID, to_gen);
+	if (err)
+		goto out;
+	EXOFS_DBGMSG(" OK\n");
+
+	/* Create bitmap object */
+	EXOFS_DBGMSG("creating free ID bitmap...\n");
+	err = create(dev, p_id, EXOFS_BM_ID, to_gen);
+	if (err)
+		goto out;
+	EXOFS_DBGMSG(" OK\n");
+
+#ifdef __MKEXOFS_DEBUG_CHECKS
+	/* Create a test file, if specified by options */
+	if (newfile) {
+		EXOFS_DBGMSG("creating test file...\n");
+		err = create(dev, p_id, EXOFS_TEST_ID, to_gen);
+		if (err)
+			goto out;
+		EXOFS_DBGMSG(" OK\n");
+	}
+#endif
+
+	/* Write superblock */
+	EXOFS_DBGMSG("writing superblock...\n");
+	err = write_super(dev, p_id, to_gen, newfile);
+	if (err)
+		goto out;
+	EXOFS_DBGMSG(" OK\n");
+
+	/* Write root directory */
+	EXOFS_DBGMSG("writing root directory...\n");
+	err = write_rootdir(dev, p_id, to_gen, newfile);
+	if (err)
+		goto out;
+	EXOFS_DBGMSG(" OK\n");
+
+	/* Set root partition inode attribute */
+	EXOFS_DBGMSG("writing root inode...\n");
+	err = set_inode(dev, p_id, to_gen, EXOFS_ROOT_ID,
+			0040000 | (0777 & ~022));
+	if (err)
+		goto out;
+	EXOFS_DBGMSG(" OK\n");
+
+#ifdef __MKEXOFS_DEBUG_CHECKS
+	/* Set test file inode attribute */
+	if (newfile) {
+		EXOFS_DBGMSG("writing test inode...\n");
+		err = set_inode(dev, p_id, to_gen, EXOFS_TEST_ID,
+				0100000 | (0777 & ~022));
+		if (err)
+			goto out;
+		EXOFS_DBGMSG(" OK\n");
+	}
+#endif
+	/* Write bitmap */
+	EXOFS_DBGMSG("writing free ID bitmap...\n");
+	err = write_bitmap(dev, p_id, to_gen);
+	if (err)
+		goto out;
+	EXOFS_DBGMSG(" OK\n");
+
+#ifdef __MKEXOFS_DEBUG_CHECKS
+	/* Write test file */
+	if (newfile) {
+		EXOFS_DBGMSG("writing test file...\n");
+		err = write_testfile(dev, p_id, to_gen);
+		if (err)
+			goto out;
+		EXOFS_DBGMSG(" OK\n");
+	}
+
+	/* some debug info */
+	{
+		EXOFS_DBGMSG("listing:\n");
+		list(dev, p_id, to_gen);
+		EXOFS_DBGMSG("contents of superblock:\n");
+		read_super(dev, p_id, to_gen);
+		EXOFS_DBGMSG("contents of root inode:\n");
+		get_root_attr(dev, p_id, to_gen);
+		if (newfile) {
+			EXOFS_DBGMSG("contents of test file:\n");
+			read_testfile(dev, p_id, to_gen);
+		}
+	}
+#endif
+	EXOFS_DBGMSG("\nsetup complete: enjoy your shiny new exofs!\n");
+
+out:
+	return err;
+}
diff --git a/fs/exofs/super.c b/fs/exofs/super.c
index 8ecf700..459b935 100644
--- a/fs/exofs/super.c
+++ b/fs/exofs/super.c
@@ -55,6 +55,8 @@ enum { Opt_lun, Opt_tid, Opt_pid, Opt_to, Opt_mkfs, Opt_format, Opt_err };
 static match_table_t tokens = {
 	{Opt_pid, "pid=%u"},
 	{Opt_to, "to=%u"},
+	{Opt_mkfs, "mkfs=%u"},
+	{Opt_format, "format=%u"},
 	{Opt_err, NULL}
 };
 
@@ -100,6 +102,16 @@ static int parse_options(char *options, struct exofs_mountopt *opts)
 			}
 			opts->timeout = option * HZ;
 			break;
+		case Opt_mkfs:
+			if (match_int(&args[0], &option))
+				return -EINVAL;
+			opts->mkfs = option != 0;
+			break;
+		case Opt_format:
+			if (match_int(&args[0], &option))
+				return -EINVAL;
+			opts->format = option;
+			break;
 		}
 	}
 
@@ -277,6 +289,12 @@ static int exofs_fill_super(struct super_block *sb, void *data, int silent)
 	sb->s_bdev = NULL;
 	sb->s_dev = 0;
 
+	/* see if we need to make the file system on the obsd */
+	if (opts->mkfs) {
+		EXOFS_DBGMSG("exofs_mkfs %p\n", sbi->s_dev);
+		exofs_mkfs(sbi->s_dev, sbi->s_pid, opts->format);
+	}
+
 	/* read data from on-disk superblock object */
 	make_credential(sbi->s_cred, sbi->s_pid, EXOFS_SUPER_ID);
 
-- 
1.6.0.1