xfs: Initial skeleton for XFS filesystem support

And another filesystem driver for Syslinux. Heh :-)

This patch *only* prints out a sample message on the screen when it
finds an active partition formated as a XFS filesystem. If this really
happens, then the XFS filesystem support in the EXTLINUX installer is
working nicely and it's time to write the driver.

Signed-off-by: Paulo Alcantara <pcacjr@zytor.com>

5 files changed, 1180 insertions, 0 deletions

diff --git a/core/fs/xfs/xfs.c b/core/fs/xfs/xfs.c
new file mode 100644
index 00000000..80969ffc
--- /dev/null
+++ b/core/fs/xfs/xfs.c
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2012 Paulo Alcantara <pcacjr@zytor.com>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it would 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 the Free Software Foundation,
+ * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <dprintf.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/dirent.h>
+#include <cache.h>
+#include <core.h>
+#include <disk.h>
+#include <fs.h>
+#include <ilog2.h>
+#include <klibc/compiler.h>
+#include <ctype.h>
+
+#include "codepage.h"
+#include "xfs_types.h"
+#include "xfs_sb.h"
+
+static int xfs_fs_init(struct fs_info *fs)
+{
+    struct disk *disk = fs->fs_dev->disk;
+    xfs_sb_t sb;
+    int retval;
+
+    /* Read XFS superblock (LBA 0) */
+    retval = disk->rdwr_sectors(disk, &sb, 0, 1, 0);
+    if (!retval)
+	return -1;
+
+    if (sb.sb_magicnum == *(uint32_t *)XFS_SB_MAGIC)
+	printf("Cool! It's a XFS filesystem! :-)\n");
+
+    /* Nothing to do for now... */
+
+    return -1;
+}
+
+const struct fs_ops xfs_fs_ops = {
+    .fs_name		= "ntfs",
+    .fs_flags		= FS_USEMEM | FS_THISIND,
+    .fs_init		= xfs_fs_init,
+    .searchdir		= NULL,
+    .getfssec		= NULL,
+    .load_config	= NULL,
+    .close_file         = NULL,
+    .mangle_name	= NULL,
+    .readdir		= NULL,
+    .iget_root		= NULL,
+    .iget		= NULL,
+    .next_extent	= NULL,
+};
diff --git a/core/fs/xfs/xfs_fs.h b/core/fs/xfs/xfs_fs.h
new file mode 100644
index 00000000..587820ec
--- /dev/null
+++ b/core/fs/xfs/xfs_fs.h
@@ -0,0 +1,501 @@
+/*
+ * Taken from Linux kernel tree (linux/fs/xfs)
+ *
+ * Copyright (c) 1995-2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * Copyright (c) 2012 Paulo Alcantara <pcacjr@zytor.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef XFS_FS_H_
+#define XFS_FS_H_
+
+/*
+ * SGI's XFS filesystem's major stuff (constants, structures)
+ */
+
+/*
+ * Direct I/O attribute record used with XFS_IOC_DIOINFO
+ * d_miniosz is the min xfer size, xfer size multiple and file seek offset
+ * alignment.
+ */
+struct dioattr {
+	uint32_t		d_mem;		/* data buffer memory alignment */
+	uint32_t		d_miniosz;	/* min xfer size		*/
+	uint32_t		d_maxiosz;	/* max xfer size		*/
+};
+
+/*
+ * Structure for XFS_IOC_FSGETXATTR[A] and XFS_IOC_FSSETXATTR.
+ */
+struct fsxattr {
+	uint32_t		fsx_xflags;	/* xflags field value (get/set) */
+	uint32_t		fsx_extsize;	/* extsize field value (get/set)*/
+	uint32_t		fsx_nextents;	/* nextents field value (get)	*/
+	uint32_t		fsx_projid;	/* project identifier (get/set) */
+	unsigned char	fsx_pad[12];
+};
+
+/*
+ * Flags for the bs_xflags/fsx_xflags field
+ * There should be a one-to-one correspondence between these flags and the
+ * XFS_DIFLAG_s.
+ */
+#define XFS_XFLAG_REALTIME	0x00000001	/* data in realtime volume */
+#define XFS_XFLAG_PREALLOC	0x00000002	/* preallocated file extents */
+#define XFS_XFLAG_IMMUTABLE	0x00000008	/* file cannot be modified */
+#define XFS_XFLAG_APPEND	0x00000010	/* all writes append */
+#define XFS_XFLAG_SYNC		0x00000020	/* all writes synchronous */
+#define XFS_XFLAG_NOATIME	0x00000040	/* do not update access time */
+#define XFS_XFLAG_NODUMP	0x00000080	/* do not include in backups */
+#define XFS_XFLAG_RTINHERIT	0x00000100	/* create with rt bit set */
+#define XFS_XFLAG_PROJINHERIT	0x00000200	/* create with parents projid */
+#define XFS_XFLAG_NOSYMLINKS	0x00000400	/* disallow symlink creation */
+#define XFS_XFLAG_EXTSIZE	0x00000800	/* extent size allocator hint */
+#define XFS_XFLAG_EXTSZINHERIT	0x00001000	/* inherit inode extent size */
+#define XFS_XFLAG_NODEFRAG	0x00002000  	/* do not defragment */
+#define XFS_XFLAG_FILESTREAM	0x00004000	/* use filestream allocator */
+#define XFS_XFLAG_HASATTR	0x80000000	/* no DIFLAG for this	*/
+
+/*
+ * Structure for XFS_IOC_GETBMAP.
+ * On input, fill in bmv_offset and bmv_length of the first structure
+ * to indicate the area of interest in the file, and bmv_entries with
+ * the number of array elements given back.  The first structure is
+ * updated on return to give the offset and length for the next call.
+ */
+struct getbmap {
+	int64_t		bmv_offset;	/* file offset of segment in blocks */
+	int64_t		bmv_block;	/* starting block (64-bit daddr_t)  */
+	int64_t		bmv_length;	/* length of segment, blocks	    */
+	int32_t		bmv_count;	/* # of entries in array incl. 1st  */
+	int32_t		bmv_entries;	/* # of entries filled in (output)  */
+};
+
+/*
+ *	Structure for XFS_IOC_GETBMAPX.	 Fields bmv_offset through bmv_entries
+ *	are used exactly as in the getbmap structure.  The getbmapx structure
+ *	has additional bmv_iflags and bmv_oflags fields. The bmv_iflags field
+ *	is only used for the first structure.  It contains input flags
+ *	specifying XFS_IOC_GETBMAPX actions.  The bmv_oflags field is filled
+ *	in by the XFS_IOC_GETBMAPX command for each returned structure after
+ *	the first.
+ */
+struct getbmapx {
+	int64_t		bmv_offset;	/* file offset of segment in blocks */
+	int64_t		bmv_block;	/* starting block (64-bit daddr_t)  */
+	int64_t		bmv_length;	/* length of segment, blocks	    */
+	int32_t		bmv_count;	/* # of entries in array incl. 1st  */
+	int32_t		bmv_entries;	/* # of entries filled in (output). */
+	int32_t		bmv_iflags;	/* input flags (1st structure)	    */
+	int32_t		bmv_oflags;	/* output flags (after 1st structure)*/
+	int32_t		bmv_unused1;	/* future use			    */
+	int32_t		bmv_unused2;	/* future use			    */
+};
+
+/*	bmv_iflags values - set by XFS_IOC_GETBMAPX caller.	*/
+#define BMV_IF_ATTRFORK		0x1	/* return attr fork rather than data */
+#define BMV_IF_NO_DMAPI_READ	0x2	/* Do not generate DMAPI read event  */
+#define BMV_IF_PREALLOC		0x4	/* rtn status BMV_OF_PREALLOC if req */
+#define BMV_IF_DELALLOC		0x8	/* rtn status BMV_OF_DELALLOC if req */
+#define BMV_IF_NO_HOLES		0x10	/* Do not return holes */
+#define BMV_IF_VALID	\
+	(BMV_IF_ATTRFORK|BMV_IF_NO_DMAPI_READ|BMV_IF_PREALLOC|	\
+	 BMV_IF_DELALLOC|BMV_IF_NO_HOLES)
+
+/*	bmv_oflags values - returned for each non-header segment */
+#define BMV_OF_PREALLOC		0x1	/* segment = unwritten pre-allocation */
+#define BMV_OF_DELALLOC		0x2	/* segment = delayed allocation */
+#define BMV_OF_LAST		0x4	/* segment is the last in the file */
+
+/*
+ * Structure for XFS_IOC_FSSETDM.
+ * For use by backup and restore programs to set the XFS on-disk inode
+ * fields di_dmevmask and di_dmstate.  These must be set to exactly and
+ * only values previously obtained via xfs_bulkstat!  (Specifically the
+ * xfs_bstat_t fields bs_dmevmask and bs_dmstate.)
+ */
+struct fsdmidata {
+	uint32_t		fsd_dmevmask;	/* corresponds to di_dmevmask */
+	__u16		fsd_padding;
+	__u16		fsd_dmstate;	/* corresponds to di_dmstate  */
+};
+
+/*
+ * File segment locking set data type for 64 bit access.
+ * Also used for all the RESV/FREE interfaces.
+ */
+typedef struct xfs_flock64 {
+	__s16		l_type;
+	__s16		l_whence;
+	int64_t		l_start;
+	int64_t		l_len;		/* len == 0 means until end of file */
+	int32_t		l_sysid;
+	uint32_t		l_pid;
+	int32_t		l_pad[4];	/* reserve area			    */
+} xfs_flock64_t;
+
+/*
+ * Output for XFS_IOC_FSGEOMETRY_V1
+ */
+typedef struct xfs_fsop_geom_v1 {
+	uint32_t		blocksize;	/* filesystem (data) block size */
+	uint32_t		rtextsize;	/* realtime extent size		*/
+	uint32_t		agblocks;	/* fsblocks in an AG		*/
+	uint32_t		agcount;	/* number of allocation groups	*/
+	uint32_t		logblocks;	/* fsblocks in the log		*/
+	uint32_t		sectsize;	/* (data) sector size, bytes	*/
+	uint32_t		inodesize;	/* inode size in bytes		*/
+	uint32_t		imaxpct;	/* max allowed inode space(%)	*/
+	uint64_t		datablocks;	/* fsblocks in data subvolume	*/
+	uint64_t		rtblocks;	/* fsblocks in realtime subvol	*/
+	uint64_t		rtextents;	/* rt extents in realtime subvol*/
+	uint64_t		logstart;	/* starting fsblock of the log	*/
+	unsigned char	uuid[16];	/* unique id of the filesystem	*/
+	uint32_t		sunit;		/* stripe unit, fsblocks	*/
+	uint32_t		swidth;		/* stripe width, fsblocks	*/
+	int32_t		version;	/* structure version		*/
+	uint32_t		flags;		/* superblock version flags	*/
+	uint32_t		logsectsize;	/* log sector size, bytes	*/
+	uint32_t		rtsectsize;	/* realtime sector size, bytes	*/
+	uint32_t		dirblocksize;	/* directory block size, bytes	*/
+} xfs_fsop_geom_v1_t;
+
+/*
+ * Output for XFS_IOC_FSGEOMETRY
+ */
+typedef struct xfs_fsop_geom {
+	uint32_t		blocksize;	/* filesystem (data) block size */
+	uint32_t		rtextsize;	/* realtime extent size		*/
+	uint32_t		agblocks;	/* fsblocks in an AG		*/
+	uint32_t		agcount;	/* number of allocation groups	*/
+	uint32_t		logblocks;	/* fsblocks in the log		*/
+	uint32_t		sectsize;	/* (data) sector size, bytes	*/
+	uint32_t		inodesize;	/* inode size in bytes		*/
+	uint32_t		imaxpct;	/* max allowed inode space(%)	*/
+	uint64_t		datablocks;	/* fsblocks in data subvolume	*/
+	uint64_t		rtblocks;	/* fsblocks in realtime subvol	*/
+	uint64_t		rtextents;	/* rt extents in realtime subvol*/
+	uint64_t		logstart;	/* starting fsblock of the log	*/
+	unsigned char	uuid[16];	/* unique id of the filesystem	*/
+	uint32_t		sunit;		/* stripe unit, fsblocks	*/
+	uint32_t		swidth;		/* stripe width, fsblocks	*/
+	int32_t		version;	/* structure version		*/
+	uint32_t		flags;		/* superblock version flags	*/
+	uint32_t		logsectsize;	/* log sector size, bytes	*/
+	uint32_t		rtsectsize;	/* realtime sector size, bytes	*/
+	uint32_t		dirblocksize;	/* directory block size, bytes	*/
+	uint32_t		logsunit;	/* log stripe unit, bytes */
+} xfs_fsop_geom_t;
+
+/* Output for XFS_FS_COUNTS */
+typedef struct xfs_fsop_counts {
+	uint64_t	freedata;	/* free data section blocks */
+	uint64_t	freertx;	/* free rt extents */
+	uint64_t	freeino;	/* free inodes */
+	uint64_t	allocino;	/* total allocated inodes */
+} xfs_fsop_counts_t;
+
+/* Input/Output for XFS_GET_RESBLKS and XFS_SET_RESBLKS */
+typedef struct xfs_fsop_resblks {
+	uint64_t  resblks;
+	uint64_t  resblks_avail;
+} xfs_fsop_resblks_t;
+
+#define XFS_FSOP_GEOM_VERSION	0
+
+#define XFS_FSOP_GEOM_FLAGS_ATTR	0x0001	/* attributes in use	*/
+#define XFS_FSOP_GEOM_FLAGS_NLINK	0x0002	/* 32-bit nlink values	*/
+#define XFS_FSOP_GEOM_FLAGS_QUOTA	0x0004	/* quotas enabled	*/
+#define XFS_FSOP_GEOM_FLAGS_IALIGN	0x0008	/* inode alignment	*/
+#define XFS_FSOP_GEOM_FLAGS_DALIGN	0x0010	/* large data alignment */
+#define XFS_FSOP_GEOM_FLAGS_SHARED	0x0020	/* read-only shared	*/
+#define XFS_FSOP_GEOM_FLAGS_EXTFLG	0x0040	/* special extent flag	*/
+#define XFS_FSOP_GEOM_FLAGS_DIRV2	0x0080	/* directory version 2	*/
+#define XFS_FSOP_GEOM_FLAGS_LOGV2	0x0100	/* log format version 2	*/
+#define XFS_FSOP_GEOM_FLAGS_SECTOR	0x0200	/* sector sizes >1BB	*/
+#define XFS_FSOP_GEOM_FLAGS_ATTR2	0x0400	/* inline attributes rework */
+#define XFS_FSOP_GEOM_FLAGS_DIRV2CI	0x1000	/* ASCII only CI names */
+#define XFS_FSOP_GEOM_FLAGS_LAZYSB	0x4000	/* lazy superblock counters */
+
+
+/*
+ * Minimum and maximum sizes need for growth checks
+ */
+#define XFS_MIN_AG_BLOCKS	64
+#define XFS_MIN_LOG_BLOCKS	512ULL
+#define XFS_MAX_LOG_BLOCKS	(1024 * 1024ULL)
+#define XFS_MIN_LOG_BYTES	(10 * 1024 * 1024ULL)
+
+/* keep the maximum size under 2^31 by a small amount */
+#define XFS_MAX_LOG_BYTES \
+	((2 * 1024 * 1024 * 1024ULL) - XFS_MIN_LOG_BYTES)
+
+/* Used for sanity checks on superblock */
+#define XFS_MAX_DBLOCKS(s) ((xfs_drfsbno_t)(s)->sb_agcount * (s)->sb_agblocks)
+#define XFS_MIN_DBLOCKS(s) ((xfs_drfsbno_t)((s)->sb_agcount - 1) *	\
+			 (s)->sb_agblocks + XFS_MIN_AG_BLOCKS)
+
+/*
+ * Structures for XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG & XFS_IOC_FSGROWFSRT
+ */
+typedef struct xfs_growfs_data {
+	uint64_t		newblocks;	/* new data subvol size, fsblocks */
+	uint32_t		imaxpct;	/* new inode space percentage limit */
+} xfs_growfs_data_t;
+
+typedef struct xfs_growfs_log {
+	uint32_t		newblocks;	/* new log size, fsblocks */
+	uint32_t		isint;		/* 1 if new log is internal */
+} xfs_growfs_log_t;
+
+typedef struct xfs_growfs_rt {
+	uint64_t		newblocks;	/* new realtime size, fsblocks */
+	uint32_t		extsize;	/* new realtime extent size, fsblocks */
+} xfs_growfs_rt_t;
+
+
+/*
+ * Structures returned from ioctl XFS_IOC_FSBULKSTAT & XFS_IOC_FSBULKSTAT_SINGLE
+ */
+typedef struct xfs_bstime {
+	time_t		tv_sec;		/* seconds		*/
+	int32_t		tv_nsec;	/* and nanoseconds	*/
+} xfs_bstime_t;
+
+typedef struct xfs_bstat {
+	uint64_t		bs_ino;		/* inode number			*/
+	__u16		bs_mode;	/* type and mode		*/
+	__u16		bs_nlink;	/* number of links		*/
+	uint32_t		bs_uid;		/* user id			*/
+	uint32_t		bs_gid;		/* group id			*/
+	uint32_t		bs_rdev;	/* device value			*/
+	int32_t		bs_blksize;	/* block size			*/
+	int64_t		bs_size;	/* file size			*/
+	xfs_bstime_t	bs_atime;	/* access time			*/
+	xfs_bstime_t	bs_mtime;	/* modify time			*/
+	xfs_bstime_t	bs_ctime;	/* inode change time		*/
+	int64_t		bs_blocks;	/* number of blocks		*/
+	uint32_t		bs_xflags;	/* extended flags		*/
+	int32_t		bs_extsize;	/* extent size			*/
+	int32_t		bs_extents;	/* number of extents		*/
+	uint32_t		bs_gen;		/* generation count		*/
+	__u16		bs_projid_lo;	/* lower part of project id	*/
+#define	bs_projid	bs_projid_lo	/* (previously just bs_projid)	*/
+	__u16		bs_forkoff;	/* inode fork offset in bytes	*/
+	__u16		bs_projid_hi;	/* higher part of project id	*/
+	unsigned char	bs_pad[10];	/* pad space, unused		*/
+	uint32_t		bs_dmevmask;	/* DMIG event mask		*/
+	__u16		bs_dmstate;	/* DMIG state info		*/
+	__u16		bs_aextents;	/* attribute number of extents	*/
+} xfs_bstat_t;
+
+/*
+ * The user-level BulkStat Request interface structure.
+ */
+typedef struct xfs_fsop_bulkreq {
+	uint64_t		__user *lastip;	/* last inode # pointer		*/
+	int32_t		icount;		/* count of entries in buffer	*/
+	void		__user *ubuffer;/* user buffer for inode desc.	*/
+	int32_t		__user *ocount;	/* output count pointer		*/
+} xfs_fsop_bulkreq_t;
+
+
+/*
+ * Structures returned from xfs_inumbers routine (XFS_IOC_FSINUMBERS).
+ */
+typedef struct xfs_inogrp {
+	uint64_t		xi_startino;	/* starting inode number	*/
+	int32_t		xi_alloccount;	/* # bits set in allocmask	*/
+	uint64_t		xi_allocmask;	/* mask of allocated inodes	*/
+} xfs_inogrp_t;
+
+
+/*
+ * Error injection.
+ */
+typedef struct xfs_error_injection {
+	int32_t		fd;
+	int32_t		errtag;
+} xfs_error_injection_t;
+
+
+/*
+ * The user-level Handle Request interface structure.
+ */
+typedef struct xfs_fsop_handlereq {
+	uint32_t		fd;		/* fd for FD_TO_HANDLE		*/
+	void		__user *path;	/* user pathname		*/
+	uint32_t		oflags;		/* open flags			*/
+	void		__user *ihandle;/* user supplied handle		*/
+	uint32_t		ihandlen;	/* user supplied length		*/
+	void		__user *ohandle;/* user buffer for handle	*/
+	uint32_t		__user *ohandlen;/* user buffer length		*/
+} xfs_fsop_handlereq_t;
+
+/*
+ * Compound structures for passing args through Handle Request interfaces
+ * xfs_fssetdm_by_handle, xfs_attrlist_by_handle, xfs_attrmulti_by_handle
+ * - ioctls: XFS_IOC_FSSETDM_BY_HANDLE, XFS_IOC_ATTRLIST_BY_HANDLE, and
+ *	     XFS_IOC_ATTRMULTI_BY_HANDLE
+ */
+
+typedef struct xfs_fsop_setdm_handlereq {
+	struct xfs_fsop_handlereq	hreq;	/* handle information	*/
+	struct fsdmidata		__user *data;	/* DMAPI data	*/
+} xfs_fsop_setdm_handlereq_t;
+
+typedef struct xfs_attrlist_cursor {
+	uint32_t		opaque[4];
+} xfs_attrlist_cursor_t;
+
+typedef struct xfs_fsop_attrlist_handlereq {
+	struct xfs_fsop_handlereq	hreq; /* handle interface structure */
+	struct xfs_attrlist_cursor	pos; /* opaque cookie, list offset */
+	uint32_t				flags;	/* which namespace to use */
+	uint32_t				buflen;	/* length of buffer supplied */
+	void				__user *buffer;	/* returned names */
+} xfs_fsop_attrlist_handlereq_t;
+
+typedef struct xfs_attr_multiop {
+	uint32_t		am_opcode;
+#define ATTR_OP_GET	1	/* return the indicated attr's value */
+#define ATTR_OP_SET	2	/* set/create the indicated attr/value pair */
+#define ATTR_OP_REMOVE	3	/* remove the indicated attr */
+	int32_t		am_error;
+	void		__user *am_attrname;
+	void		__user *am_attrvalue;
+	uint32_t		am_length;
+	uint32_t		am_flags;
+} xfs_attr_multiop_t;
+
+typedef struct xfs_fsop_attrmulti_handlereq {
+	struct xfs_fsop_handlereq	hreq; /* handle interface structure */
+	uint32_t				opcount;/* count of following multiop */
+	struct xfs_attr_multiop		__user *ops; /* attr_multi data */
+} xfs_fsop_attrmulti_handlereq_t;
+
+/*
+ * per machine unique filesystem identifier types.
+ */
+typedef struct { uint32_t val[2]; } xfs_fsid_t; /* file system id type */
+
+typedef struct xfs_fid {
+	__u16	fid_len;		/* length of remainder	*/
+	__u16	fid_pad;
+	uint32_t	fid_gen;		/* generation number	*/
+	uint64_t	fid_ino;		/* 64 bits inode number */
+} xfs_fid_t;
+
+typedef struct xfs_handle {
+	union {
+		int64_t	    align;	/* force alignment of ha_fid	 */
+		xfs_fsid_t  _ha_fsid;	/* unique file system identifier */
+	} ha_u;
+	xfs_fid_t	ha_fid;		/* file system specific file ID	 */
+} xfs_handle_t;
+#define ha_fsid ha_u._ha_fsid
+
+#define XFS_HSIZE(handle)	(((char *) &(handle).ha_fid.fid_pad	 \
+				 - (char *) &(handle))			  \
+				 + (handle).ha_fid.fid_len)
+
+/*
+ * Flags for going down operation
+ */
+#define XFS_FSOP_GOING_FLAGS_DEFAULT		0x0	/* going down */
+#define XFS_FSOP_GOING_FLAGS_LOGFLUSH		0x1	/* flush log but not data */
+#define XFS_FSOP_GOING_FLAGS_NOLOGFLUSH		0x2	/* don't flush log nor data */
+
+/*
+ * ioctl commands that are used by Linux filesystems
+ */
+#define XFS_IOC_GETXFLAGS	FS_IOC_GETFLAGS
+#define XFS_IOC_SETXFLAGS	FS_IOC_SETFLAGS
+#define XFS_IOC_GETVERSION	FS_IOC_GETVERSION
+
+/*
+ * ioctl commands that replace IRIX fcntl()'s
+ * For 'documentation' purposed more than anything else,
+ * the "cmd #" field reflects the IRIX fcntl number.
+ */
+#define XFS_IOC_ALLOCSP		_IOW ('X', 10, struct xfs_flock64)
+#define XFS_IOC_FREESP		_IOW ('X', 11, struct xfs_flock64)
+#define XFS_IOC_DIOINFO		_IOR ('X', 30, struct dioattr)
+#define XFS_IOC_FSGETXATTR	_IOR ('X', 31, struct fsxattr)
+#define XFS_IOC_FSSETXATTR	_IOW ('X', 32, struct fsxattr)
+#define XFS_IOC_ALLOCSP64	_IOW ('X', 36, struct xfs_flock64)
+#define XFS_IOC_FREESP64	_IOW ('X', 37, struct xfs_flock64)
+#define XFS_IOC_GETBMAP		_IOWR('X', 38, struct getbmap)
+#define XFS_IOC_FSSETDM		_IOW ('X', 39, struct fsdmidata)
+#define XFS_IOC_RESVSP		_IOW ('X', 40, struct xfs_flock64)
+#define XFS_IOC_UNRESVSP	_IOW ('X', 41, struct xfs_flock64)
+#define XFS_IOC_RESVSP64	_IOW ('X', 42, struct xfs_flock64)
+#define XFS_IOC_UNRESVSP64	_IOW ('X', 43, struct xfs_flock64)
+#define XFS_IOC_GETBMAPA	_IOWR('X', 44, struct getbmap)
+#define XFS_IOC_FSGETXATTRA	_IOR ('X', 45, struct fsxattr)
+/*	XFS_IOC_SETBIOSIZE ---- deprecated 46	   */
+/*	XFS_IOC_GETBIOSIZE ---- deprecated 47	   */
+#define XFS_IOC_GETBMAPX	_IOWR('X', 56, struct getbmap)
+#define XFS_IOC_ZERO_RANGE	_IOW ('X', 57, struct xfs_flock64)
+
+/*
+ * ioctl commands that replace IRIX syssgi()'s
+ */
+#define XFS_IOC_FSGEOMETRY_V1	     _IOR ('X', 100, struct xfs_fsop_geom_v1)
+#define XFS_IOC_FSBULKSTAT	     _IOWR('X', 101, struct xfs_fsop_bulkreq)
+#define XFS_IOC_FSBULKSTAT_SINGLE    _IOWR('X', 102, struct xfs_fsop_bulkreq)
+#define XFS_IOC_FSINUMBERS	     _IOWR('X', 103, struct xfs_fsop_bulkreq)
+#define XFS_IOC_PATH_TO_FSHANDLE     _IOWR('X', 104, struct xfs_fsop_handlereq)
+#define XFS_IOC_PATH_TO_HANDLE	     _IOWR('X', 105, struct xfs_fsop_handlereq)
+#define XFS_IOC_FD_TO_HANDLE	     _IOWR('X', 106, struct xfs_fsop_handlereq)
+#define XFS_IOC_OPEN_BY_HANDLE	     _IOWR('X', 107, struct xfs_fsop_handlereq)
+#define XFS_IOC_READLINK_BY_HANDLE   _IOWR('X', 108, struct xfs_fsop_handlereq)
+#define XFS_IOC_SWAPEXT		     _IOWR('X', 109, struct xfs_swapext)
+#define XFS_IOC_FSGROWFSDATA	     _IOW ('X', 110, struct xfs_growfs_data)
+#define XFS_IOC_FSGROWFSLOG	     _IOW ('X', 111, struct xfs_growfs_log)
+#define XFS_IOC_FSGROWFSRT	     _IOW ('X', 112, struct xfs_growfs_rt)
+#define XFS_IOC_FSCOUNTS	     _IOR ('X', 113, struct xfs_fsop_counts)
+#define XFS_IOC_SET_RESBLKS	     _IOWR('X', 114, struct xfs_fsop_resblks)
+#define XFS_IOC_GET_RESBLKS	     _IOR ('X', 115, struct xfs_fsop_resblks)
+#define XFS_IOC_ERROR_INJECTION	     _IOW ('X', 116, struct xfs_error_injection)
+#define XFS_IOC_ERROR_CLEARALL	     _IOW ('X', 117, struct xfs_error_injection)
+/*	XFS_IOC_ATTRCTL_BY_HANDLE -- deprecated 118	 */
+/*	XFS_IOC_FREEZE		  -- FIFREEZE   119	 */
+/*	XFS_IOC_THAW		  -- FITHAW     120	 */
+#define XFS_IOC_FSSETDM_BY_HANDLE    _IOW ('X', 121, struct xfs_fsop_setdm_handlereq)
+#define XFS_IOC_ATTRLIST_BY_HANDLE   _IOW ('X', 122, struct xfs_fsop_attrlist_handlereq)
+#define XFS_IOC_ATTRMULTI_BY_HANDLE  _IOW ('X', 123, struct xfs_fsop_attrmulti_handlereq)
+#define XFS_IOC_FSGEOMETRY	     _IOR ('X', 124, struct xfs_fsop_geom)
+#define XFS_IOC_GOINGDOWN	     _IOR ('X', 125, __uint32_t)
+/*	XFS_IOC_GETFSUUID ---------- deprecated 140	 */
+
+
+#ifndef HAVE_BBMACROS
+/*
+ * Block I/O parameterization.	A basic block (BB) is the lowest size of
+ * filesystem allocation, and must equal 512.  Length units given to bio
+ * routines are in BB's.
+ */
+#define BBSHIFT		9
+#define BBSIZE		(1<<BBSHIFT)
+#define BBMASK		(BBSIZE-1)
+#define BTOBB(bytes)	(((uint64_t)(bytes) + BBSIZE - 1) >> BBSHIFT)
+#define BTOBBT(bytes)	((uint64_t)(bytes) >> BBSHIFT)
+#define BBTOB(bbs)	((bbs) << BBSHIFT)
+#endif
+
+#endif	/* XFS_FS_H_ */
diff --git a/core/fs/xfs/xfs_sb.h b/core/fs/xfs/xfs_sb.h
new file mode 100644
index 00000000..2290e6a0
--- /dev/null
+++ b/core/fs/xfs/xfs_sb.h
@@ -0,0 +1,476 @@
+/*
+ * Taken from Linux kernel tree (linux/fs/xfs)
+ *
+ * Copyright (c) 2000-2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * Copyright (c) 2012 Paulo Alcantara <pcacjr@zytor.com>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it would 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 the Free Software Foundation,
+ * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#ifndef XFS_SB_H_
+#define	XFS_SB_H_
+
+#include <stddef.h>
+
+#include <sys/types.h>
+
+typedef unsigned char uuid_t[16];
+
+/*
+ * Super block
+ * Fits into a sector-sized buffer at address 0 of each allocation group.
+ * Only the first of these is ever updated except during growfs.
+ */
+
+struct xfs_buf;
+struct xfs_mount;
+
+#define	XFS_SB_MAGIC		"XFSB"		/* 'XFSB' */
+#define	XFS_SB_VERSION_1	1		/* 5.3, 6.0.1, 6.1 */
+#define	XFS_SB_VERSION_2	2		/* 6.2 - attributes */
+#define	XFS_SB_VERSION_3	3		/* 6.2 - new inode version */
+#define	XFS_SB_VERSION_4	4		/* 6.2+ - bitmask version */
+#define	XFS_SB_VERSION_NUMBITS		0x000f
+#define	XFS_SB_VERSION_ALLFBITS		0xfff0
+#define	XFS_SB_VERSION_SASHFBITS	0xf000
+#define	XFS_SB_VERSION_REALFBITS	0x0ff0
+#define	XFS_SB_VERSION_ATTRBIT		0x0010
+#define	XFS_SB_VERSION_NLINKBIT		0x0020
+#define	XFS_SB_VERSION_QUOTABIT		0x0040
+#define	XFS_SB_VERSION_ALIGNBIT		0x0080
+#define	XFS_SB_VERSION_DALIGNBIT	0x0100
+#define	XFS_SB_VERSION_SHAREDBIT	0x0200
+#define XFS_SB_VERSION_LOGV2BIT		0x0400
+#define XFS_SB_VERSION_SECTORBIT	0x0800
+#define	XFS_SB_VERSION_EXTFLGBIT	0x1000
+#define	XFS_SB_VERSION_DIRV2BIT		0x2000
+#define	XFS_SB_VERSION_BORGBIT		0x4000	/* ASCII only case-insens. */
+#define	XFS_SB_VERSION_MOREBITSBIT	0x8000
+#define	XFS_SB_VERSION_OKSASHFBITS	\
+	(XFS_SB_VERSION_EXTFLGBIT | \
+	 XFS_SB_VERSION_DIRV2BIT | \
+	 XFS_SB_VERSION_BORGBIT)
+#define	XFS_SB_VERSION_OKREALFBITS	\
+	(XFS_SB_VERSION_ATTRBIT | \
+	 XFS_SB_VERSION_NLINKBIT | \
+	 XFS_SB_VERSION_QUOTABIT | \
+	 XFS_SB_VERSION_ALIGNBIT | \
+	 XFS_SB_VERSION_DALIGNBIT | \
+	 XFS_SB_VERSION_SHAREDBIT | \
+	 XFS_SB_VERSION_LOGV2BIT | \
+	 XFS_SB_VERSION_SECTORBIT | \
+	 XFS_SB_VERSION_MOREBITSBIT)
+#define	XFS_SB_VERSION_OKREALBITS	\
+	(XFS_SB_VERSION_NUMBITS | \
+	 XFS_SB_VERSION_OKREALFBITS | \
+	 XFS_SB_VERSION_OKSASHFBITS)
+
+/*
+ * There are two words to hold XFS "feature" bits: the original
+ * word, sb_versionnum, and sb_features2.  Whenever a bit is set in
+ * sb_features2, the feature bit XFS_SB_VERSION_MOREBITSBIT must be set.
+ *
+ * These defines represent bits in sb_features2.
+ */
+#define XFS_SB_VERSION2_REALFBITS	0x00ffffff	/* Mask: features */
+#define XFS_SB_VERSION2_RESERVED1BIT	0x00000001
+#define XFS_SB_VERSION2_LAZYSBCOUNTBIT	0x00000002	/* Superblk counters */
+#define XFS_SB_VERSION2_RESERVED4BIT	0x00000004
+#define XFS_SB_VERSION2_ATTR2BIT	0x00000008	/* Inline attr rework */
+#define XFS_SB_VERSION2_PARENTBIT	0x00000010	/* parent pointers */
+#define XFS_SB_VERSION2_PROJID32BIT	0x00000080	/* 32 bit project id */
+
+#define	XFS_SB_VERSION2_OKREALFBITS	\
+	(XFS_SB_VERSION2_LAZYSBCOUNTBIT	| \
+	 XFS_SB_VERSION2_ATTR2BIT	| \
+	 XFS_SB_VERSION2_PROJID32BIT)
+#define	XFS_SB_VERSION2_OKSASHFBITS	\
+	(0)
+#define XFS_SB_VERSION2_OKREALBITS	\
+	(XFS_SB_VERSION2_OKREALFBITS |	\
+	 XFS_SB_VERSION2_OKSASHFBITS )
+
+/*
+ * Superblock - in core version.  Must match the ondisk version below.
+ * Must be padded to 64 bit alignment.
+ */
+typedef struct xfs_sb {
+    uint32_t	sb_magicnum;	/* magic number == XFS_SB_MAGIC */
+    uint32_t	sb_blocksize;	/* logical block size, bytes */
+    xfs_drfsbno_t	sb_dblocks;	/* number of data blocks */
+    xfs_drfsbno_t	sb_rblocks;	/* number of realtime blocks */
+    xfs_drtbno_t	sb_rextents;	/* number of realtime extents */
+    uuid_t		sb_uuid;	/* file system unique id */
+    xfs_dfsbno_t	sb_logstart;	/* starting block of log if internal */
+    xfs_ino_t	sb_rootino;	/* root inode number */
+    xfs_ino_t	sb_rbmino;	/* bitmap inode for realtime extents */
+    xfs_ino_t	sb_rsumino;	/* summary inode for rt bitmap */
+    xfs_agblock_t	sb_rextsize;	/* realtime extent size, blocks */
+    xfs_agblock_t	sb_agblocks;	/* size of an allocation group */
+    xfs_agnumber_t	sb_agcount;	/* number of allocation groups */
+    xfs_extlen_t	sb_rbmblocks;	/* number of rt bitmap blocks */
+    xfs_extlen_t	sb_logblocks;	/* number of log blocks */
+    uint16_t	sb_versionnum;	/* header version == XFS_SB_VERSION */
+    uint16_t	sb_sectsize;	/* volume sector size, bytes */
+    uint16_t	sb_inodesize;	/* inode size, bytes */
+    uint16_t	sb_inopblock;	/* inodes per block */
+    char	sb_fname[12];	/* file system name */
+    uint8_t	sb_blocklog;	/* log2 of sb_blocksize */
+    uint8_t	sb_sectlog;	/* log2 of sb_sectsize */
+    uint8_t	sb_inodelog;	/* log2 of sb_inodesize */
+    uint8_t	sb_inopblog;	/* log2 of sb_inopblock */
+    uint8_t	sb_agblklog;	/* log2 of sb_agblocks (rounded up) */
+    uint8_t	sb_rextslog;	/* log2 of sb_rextents */
+    uint8_t	sb_inprogress;	/* mkfs is in progress, don't mount */
+    uint8_t	sb_imax_pct;	/* max % of fs for inode space */
+					/* statistics */
+    /*
+     * These fields must remain contiguous.  If you really
+     * want to change their layout, make sure you fix the
+     * code in xfs_trans_apply_sb_deltas().
+     */
+    uint64_t	sb_icount;	/* allocated inodes */
+    uint64_t	sb_ifree;	/* free inodes */
+    uint64_t	sb_fdblocks;	/* free data blocks */
+    uint64_t	sb_frextents;	/* free realtime extents */
+    /*
+     * End contiguous fields.
+     */
+    xfs_ino_t	sb_uquotino;	/* user quota inode */
+    xfs_ino_t	sb_gquotino;	/* group quota inode */
+    uint16_t	sb_qflags;	/* quota flags */
+    uint8_t	sb_flags;	/* misc. flags */
+    uint8_t	sb_shared_vn;	/* shared version number */
+    xfs_extlen_t	sb_inoalignmt;	/* inode chunk alignment, fsblocks */
+    uint32_t	sb_unit;	/* stripe or raid unit */
+    uint32_t	sb_width;	/* stripe or raid width */
+    uint8_t	sb_dirblklog;	/* log2 of dir block size (fsbs) */
+    uint8_t	sb_logsectlog;	/* log2 of the log sector size */
+    uint16_t	sb_logsectsize;	/* sector size for the log, bytes */
+    uint32_t	sb_logsunit;	/* stripe unit size for the log */
+    uint32_t	sb_features2;	/* additional feature bits */
+
+    /*
+     * bad features2 field as a result of failing to pad the sb
+     * structure to 64 bits. Some machines will be using this field
+     * for features2 bits. Easiest just to mark it bad and not use
+     * it for anything else.
+     */
+    uint32_t	sb_bad_features2;
+    uint8_t	pad[304]; /* must be padded to a sector boundary */
+} __attribute__((__packed__)) xfs_sb_t;
+
+/*
+ * Sequence number values for the fields.
+ */
+typedef enum {
+	XFS_SBS_MAGICNUM, XFS_SBS_BLOCKSIZE, XFS_SBS_DBLOCKS, XFS_SBS_RBLOCKS,
+	XFS_SBS_REXTENTS, XFS_SBS_UUID, XFS_SBS_LOGSTART, XFS_SBS_ROOTINO,
+	XFS_SBS_RBMINO, XFS_SBS_RSUMINO, XFS_SBS_REXTSIZE, XFS_SBS_AGBLOCKS,
+	XFS_SBS_AGCOUNT, XFS_SBS_RBMBLOCKS, XFS_SBS_LOGBLOCKS,
+	XFS_SBS_VERSIONNUM, XFS_SBS_SECTSIZE, XFS_SBS_INODESIZE,
+	XFS_SBS_INOPBLOCK, XFS_SBS_FNAME, XFS_SBS_BLOCKLOG,
+	XFS_SBS_SECTLOG, XFS_SBS_INODELOG, XFS_SBS_INOPBLOG, XFS_SBS_AGBLKLOG,
+	XFS_SBS_REXTSLOG, XFS_SBS_INPROGRESS, XFS_SBS_IMAX_PCT, XFS_SBS_ICOUNT,
+	XFS_SBS_IFREE, XFS_SBS_FDBLOCKS, XFS_SBS_FREXTENTS, XFS_SBS_UQUOTINO,
+	XFS_SBS_GQUOTINO, XFS_SBS_QFLAGS, XFS_SBS_FLAGS, XFS_SBS_SHARED_VN,
+	XFS_SBS_INOALIGNMT, XFS_SBS_UNIT, XFS_SBS_WIDTH, XFS_SBS_DIRBLKLOG,
+	XFS_SBS_LOGSECTLOG, XFS_SBS_LOGSECTSIZE, XFS_SBS_LOGSUNIT,
+	XFS_SBS_FEATURES2, XFS_SBS_BAD_FEATURES2,
+	XFS_SBS_FIELDCOUNT
+} xfs_sb_field_t;
+
+/*
+ * Mask values, defined based on the xfs_sb_field_t values.
+ * Only define the ones we're using.
+ */
+#define	XFS_SB_MVAL(x)		(1LL << XFS_SBS_ ## x)
+#define	XFS_SB_UUID		XFS_SB_MVAL(UUID)
+#define	XFS_SB_FNAME		XFS_SB_MVAL(FNAME)
+#define	XFS_SB_ROOTINO		XFS_SB_MVAL(ROOTINO)
+#define	XFS_SB_RBMINO		XFS_SB_MVAL(RBMINO)
+#define	XFS_SB_RSUMINO		XFS_SB_MVAL(RSUMINO)
+#define	XFS_SB_VERSIONNUM	XFS_SB_MVAL(VERSIONNUM)
+#define XFS_SB_UQUOTINO		XFS_SB_MVAL(UQUOTINO)
+#define XFS_SB_GQUOTINO		XFS_SB_MVAL(GQUOTINO)
+#define XFS_SB_QFLAGS		XFS_SB_MVAL(QFLAGS)
+#define XFS_SB_SHARED_VN	XFS_SB_MVAL(SHARED_VN)
+#define XFS_SB_UNIT		XFS_SB_MVAL(UNIT)
+#define XFS_SB_WIDTH		XFS_SB_MVAL(WIDTH)
+#define XFS_SB_ICOUNT		XFS_SB_MVAL(ICOUNT)
+#define XFS_SB_IFREE		XFS_SB_MVAL(IFREE)
+#define XFS_SB_FDBLOCKS		XFS_SB_MVAL(FDBLOCKS)
+#define XFS_SB_FEATURES2	XFS_SB_MVAL(FEATURES2)
+#define XFS_SB_BAD_FEATURES2	XFS_SB_MVAL(BAD_FEATURES2)
+#define	XFS_SB_NUM_BITS		((int)XFS_SBS_FIELDCOUNT)
+#define	XFS_SB_ALL_BITS		((1LL << XFS_SB_NUM_BITS) - 1)
+#define	XFS_SB_MOD_BITS		\
+	(XFS_SB_UUID | XFS_SB_ROOTINO | XFS_SB_RBMINO | XFS_SB_RSUMINO | \
+	 XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO | XFS_SB_GQUOTINO | \
+	 XFS_SB_QFLAGS | XFS_SB_SHARED_VN | XFS_SB_UNIT | XFS_SB_WIDTH | \
+	 XFS_SB_ICOUNT | XFS_SB_IFREE | XFS_SB_FDBLOCKS | XFS_SB_FEATURES2 | \
+	 XFS_SB_BAD_FEATURES2)
+
+
+/*
+ * Misc. Flags - warning - these will be cleared by xfs_repair unless
+ * a feature bit is set when the flag is used.
+ */
+#define XFS_SBF_NOFLAGS		0x00	/* no flags set */
+#define XFS_SBF_READONLY	0x01	/* only read-only mounts allowed */
+
+/*
+ * define max. shared version we can interoperate with
+ */
+#define XFS_SB_MAX_SHARED_VN	0
+
+#define	XFS_SB_VERSION_NUM(sbp)	((sbp)->sb_versionnum & XFS_SB_VERSION_NUMBITS)
+
+static inline int xfs_sb_good_version(xfs_sb_t *sbp)
+{
+	/* We always support version 1-3 */
+	if (sbp->sb_versionnum >= XFS_SB_VERSION_1 &&
+	    sbp->sb_versionnum <= XFS_SB_VERSION_3)
+		return 1;
+
+	/* We support version 4 if all feature bits are supported */
+	if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) {
+		if ((sbp->sb_versionnum & ~XFS_SB_VERSION_OKREALBITS) ||
+		    ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) &&
+		     (sbp->sb_features2 & ~XFS_SB_VERSION2_OKREALBITS)))
+			return 0;
+
+		if ((sbp->sb_versionnum & XFS_SB_VERSION_SHAREDBIT) &&
+		    sbp->sb_shared_vn > XFS_SB_MAX_SHARED_VN)
+			return 0;
+
+		return 1;
+	}
+
+	return 0;
+}
+
+/*
+ * Detect a mismatched features2 field.  Older kernels read/wrote
+ * this into the wrong slot, so to be safe we keep them in sync.
+ */
+static inline int xfs_sb_has_mismatched_features2(xfs_sb_t *sbp)
+{
+	return (sbp->sb_bad_features2 != sbp->sb_features2);
+}
+
+static inline unsigned xfs_sb_version_tonew(unsigned v)
+{
+	if (v == XFS_SB_VERSION_1)
+		return XFS_SB_VERSION_4;
+
+	if (v == XFS_SB_VERSION_2)
+		return XFS_SB_VERSION_4 | XFS_SB_VERSION_ATTRBIT;
+
+	return XFS_SB_VERSION_4 | XFS_SB_VERSION_ATTRBIT |
+		XFS_SB_VERSION_NLINKBIT;
+}
+
+static inline unsigned xfs_sb_version_toold(unsigned v)
+{
+	if (v & (XFS_SB_VERSION_QUOTABIT | XFS_SB_VERSION_ALIGNBIT))
+		return 0;
+	if (v & XFS_SB_VERSION_NLINKBIT)
+		return XFS_SB_VERSION_3;
+	if (v & XFS_SB_VERSION_ATTRBIT)
+		return XFS_SB_VERSION_2;
+	return XFS_SB_VERSION_1;
+}
+
+static inline int xfs_sb_version_hasattr(xfs_sb_t *sbp)
+{
+	return sbp->sb_versionnum == XFS_SB_VERSION_2 ||
+		sbp->sb_versionnum == XFS_SB_VERSION_3 ||
+		(XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+		 (sbp->sb_versionnum & XFS_SB_VERSION_ATTRBIT));
+}
+
+static inline void xfs_sb_version_addattr(xfs_sb_t *sbp)
+{
+	if (sbp->sb_versionnum == XFS_SB_VERSION_1)
+		sbp->sb_versionnum = XFS_SB_VERSION_2;
+	else if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4)
+		sbp->sb_versionnum |= XFS_SB_VERSION_ATTRBIT;
+	else
+		sbp->sb_versionnum = XFS_SB_VERSION_4 | XFS_SB_VERSION_ATTRBIT;
+}
+
+static inline int xfs_sb_version_hasnlink(xfs_sb_t *sbp)
+{
+	return sbp->sb_versionnum == XFS_SB_VERSION_3 ||
+		 (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+		  (sbp->sb_versionnum & XFS_SB_VERSION_NLINKBIT));
+}
+
+static inline void xfs_sb_version_addnlink(xfs_sb_t *sbp)
+{
+	if (sbp->sb_versionnum <= XFS_SB_VERSION_2)
+		sbp->sb_versionnum = XFS_SB_VERSION_3;
+	else
+		sbp->sb_versionnum |= XFS_SB_VERSION_NLINKBIT;
+}
+
+static inline int xfs_sb_version_hasquota(xfs_sb_t *sbp)
+{
+	return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+		(sbp->sb_versionnum & XFS_SB_VERSION_QUOTABIT);
+}
+
+static inline void xfs_sb_version_addquota(xfs_sb_t *sbp)
+{
+	if (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4)
+		sbp->sb_versionnum |= XFS_SB_VERSION_QUOTABIT;
+	else
+		sbp->sb_versionnum = xfs_sb_version_tonew(sbp->sb_versionnum) |
+					XFS_SB_VERSION_QUOTABIT;
+}
+
+static inline int xfs_sb_version_hasalign(xfs_sb_t *sbp)
+{
+	return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+		(sbp->sb_versionnum & XFS_SB_VERSION_ALIGNBIT);
+}
+
+static inline int xfs_sb_version_hasdalign(xfs_sb_t *sbp)
+{
+	return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+		(sbp->sb_versionnum & XFS_SB_VERSION_DALIGNBIT);
+}
+
+static inline int xfs_sb_version_hasshared(xfs_sb_t *sbp)
+{
+	return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+		(sbp->sb_versionnum & XFS_SB_VERSION_SHAREDBIT);
+}
+
+static inline int xfs_sb_version_hasdirv2(xfs_sb_t *sbp)
+{
+	return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+		(sbp->sb_versionnum & XFS_SB_VERSION_DIRV2BIT);
+}
+
+static inline int xfs_sb_version_haslogv2(xfs_sb_t *sbp)
+{
+	return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+		(sbp->sb_versionnum & XFS_SB_VERSION_LOGV2BIT);
+}
+
+static inline int xfs_sb_version_hasextflgbit(xfs_sb_t *sbp)
+{
+	return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+		(sbp->sb_versionnum & XFS_SB_VERSION_EXTFLGBIT);
+}
+
+static inline int xfs_sb_version_hassector(xfs_sb_t *sbp)
+{
+	return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+		(sbp->sb_versionnum & XFS_SB_VERSION_SECTORBIT);
+}
+
+static inline int xfs_sb_version_hasasciici(xfs_sb_t *sbp)
+{
+	return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+		(sbp->sb_versionnum & XFS_SB_VERSION_BORGBIT);
+}
+
+static inline int xfs_sb_version_hasmorebits(xfs_sb_t *sbp)
+{
+	return XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 &&
+		(sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT);
+}
+
+/*
+ * sb_features2 bit version macros.
+ *
+ * For example, for a bit defined as XFS_SB_VERSION2_FUNBIT, has a macro:
+ *
+ * SB_VERSION_HASFUNBIT(xfs_sb_t *sbp)
+ *	((xfs_sb_version_hasmorebits(sbp) &&
+ *	 ((sbp)->sb_features2 & XFS_SB_VERSION2_FUNBIT)
+ */
+
+static inline int xfs_sb_version_haslazysbcount(xfs_sb_t *sbp)
+{
+	return xfs_sb_version_hasmorebits(sbp) &&
+		(sbp->sb_features2 & XFS_SB_VERSION2_LAZYSBCOUNTBIT);
+}
+
+static inline int xfs_sb_version_hasattr2(xfs_sb_t *sbp)
+{
+	return xfs_sb_version_hasmorebits(sbp) &&
+		(sbp->sb_features2 & XFS_SB_VERSION2_ATTR2BIT);
+}
+
+static inline void xfs_sb_version_addattr2(xfs_sb_t *sbp)
+{
+	sbp->sb_versionnum |= XFS_SB_VERSION_MOREBITSBIT;
+	sbp->sb_features2 |= XFS_SB_VERSION2_ATTR2BIT;
+}
+
+static inline void xfs_sb_version_removeattr2(xfs_sb_t *sbp)
+{
+	sbp->sb_features2 &= ~XFS_SB_VERSION2_ATTR2BIT;
+	if (!sbp->sb_features2)
+		sbp->sb_versionnum &= ~XFS_SB_VERSION_MOREBITSBIT;
+}
+
+static inline int xfs_sb_version_hasprojid32bit(xfs_sb_t *sbp)
+{
+	return xfs_sb_version_hasmorebits(sbp) &&
+		(sbp->sb_features2 & XFS_SB_VERSION2_PROJID32BIT);
+}
+
+/*
+ * end of superblock version macros
+ */
+
+#define XFS_SB_DADDR		((xfs_daddr_t)0) /* daddr in filesystem/ag */
+#define	XFS_SB_BLOCK(mp)	XFS_HDR_BLOCK(mp, XFS_SB_DADDR)
+#define XFS_BUF_TO_SBP(bp)	((xfs_dsb_t *)((bp)->b_addr))
+
+#define	XFS_HDR_BLOCK(mp,d)	((xfs_agblock_t)XFS_BB_TO_FSBT(mp,d))
+#define	XFS_DADDR_TO_FSB(mp,d)	XFS_AGB_TO_FSB(mp, \
+			xfs_daddr_to_agno(mp,d), xfs_daddr_to_agbno(mp,d))
+#define	XFS_FSB_TO_DADDR(mp,fsbno)	XFS_AGB_TO_DADDR(mp, \
+			XFS_FSB_TO_AGNO(mp,fsbno), XFS_FSB_TO_AGBNO(mp,fsbno))
+
+/*
+ * File system sector to basic block conversions.
+ */
+#define XFS_FSS_TO_BB(mp,sec)	((sec) << (mp)->m_sectbb_log)
+
+/*
+ * File system block to basic block conversions.
+ */
+#define	XFS_FSB_TO_BB(mp,fsbno)	((fsbno) << (mp)->m_blkbb_log)
+#define	XFS_BB_TO_FSB(mp,bb)	\
+	(((bb) + (XFS_FSB_TO_BB(mp,1) - 1)) >> (mp)->m_blkbb_log)
+#define	XFS_BB_TO_FSBT(mp,bb)	((bb) >> (mp)->m_blkbb_log)
+
+/*
+ * File system block to byte conversions.
+ */
+#define XFS_FSB_TO_B(mp,fsbno)	((xfs_fsize_t)(fsbno) << (mp)->m_sb.sb_blocklog)
+#define XFS_B_TO_FSB(mp,b)	\
+	((((uint64_t)(b)) + (mp)->m_blockmask) >> (mp)->m_sb.sb_blocklog)
+#define XFS_B_TO_FSBT(mp,b)	(((uint64_t)(b)) >> (mp)->m_sb.sb_blocklog)
+#define XFS_B_FSB_OFFSET(mp,b)	((b) & (mp)->m_blockmask)
+
+#endif	/* XFS_SB_H_ */
diff --git a/core/fs/xfs/xfs_types.h b/core/fs/xfs/xfs_types.h
new file mode 100644
index 00000000..92808865
--- /dev/null
+++ b/core/fs/xfs/xfs_types.h
@@ -0,0 +1,135 @@
+/*
+ * Taken from Linux kernel tree (linux/fs/xfs)
+ *
+ * Copyright (c) 2000-2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * Copyright (c) 2012 Paulo Alcantara <pcacjr@zytor.com>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it would 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 the Free Software Foundation,
+ * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#ifndef XFS_TYPES_H_
+#define	XFS_TYPES_H_
+
+#include <stddef.h>
+
+#include <sys/types.h>
+
+typedef enum { B_FALSE,B_TRUE }	boolean_t;
+typedef uint32_t		prid_t;		/* project ID */
+typedef uint32_t		inst_t;		/* an instruction */
+
+typedef int64_t			xfs_off_t;	/* <file offset> type */
+typedef unsigned long long	xfs_ino_t;	/* <inode> type */
+typedef int64_t			xfs_daddr_t;	/* <disk address> type */
+typedef char *			xfs_caddr_t;	/* <core address> type */
+typedef uint32_t			xfs_dev_t;
+typedef uint32_t			xfs_nlink_t;
+
+/* __psint_t is the same size as a pointer */
+typedef int32_t __psint_t;
+typedef uint32_t __psunsigned_t;
+
+typedef uint32_t	xfs_agblock_t;	/* blockno in alloc. group */
+typedef	uint32_t	xfs_extlen_t;	/* extent length in blocks */
+typedef	uint32_t	xfs_agnumber_t;	/* allocation group number */
+typedef int32_t	xfs_extnum_t;	/* # of extents in a file */
+typedef int16_t	xfs_aextnum_t;	/* # extents in an attribute fork */
+typedef	int64_t	xfs_fsize_t;	/* bytes in a file */
+typedef uint64_t	xfs_ufsize_t;	/* unsigned bytes in a file */
+
+typedef	int32_t	xfs_suminfo_t;	/* type of bitmap summary info */
+typedef	int32_t	xfs_rtword_t;	/* word type for bitmap manipulations */
+
+typedef	int64_t	xfs_lsn_t;	/* log sequence number */
+typedef	int32_t	xfs_tid_t;	/* transaction identifier */
+
+typedef	uint32_t	xfs_dablk_t;	/* dir/attr block number (in file) */
+typedef	uint32_t	xfs_dahash_t;	/* dir/attr hash value */
+
+/*
+ * These types are 64 bits on disk but are either 32 or 64 bits in memory.
+ * Disk based types:
+ */
+typedef uint64_t	xfs_dfsbno_t;	/* blockno in filesystem (agno|agbno) */
+typedef uint64_t	xfs_drfsbno_t;	/* blockno in filesystem (raw) */
+typedef	uint64_t	xfs_drtbno_t;	/* extent (block) in realtime area */
+typedef	uint64_t	xfs_dfiloff_t;	/* block number in a file */
+typedef	uint64_t	xfs_dfilblks_t;	/* number of blocks in a file */
+
+/*
+ * Memory based types are conditional.
+ */
+typedef	uint64_t	xfs_fsblock_t;	/* blockno in filesystem (agno|agbno) */
+typedef uint64_t	xfs_rfsblock_t;	/* blockno in filesystem (raw) */
+typedef uint64_t	xfs_rtblock_t;	/* extent (block) in realtime area */
+typedef	int64_t	xfs_srtblock_t;	/* signed version of xfs_rtblock_t */
+
+typedef uint64_t	xfs_fileoff_t;	/* block number in a file */
+typedef int64_t	xfs_sfiloff_t;	/* signed block number in a file */
+typedef uint64_t	xfs_filblks_t;	/* number of blocks in a file */
+
+/*
+ * Null values for the types.
+ */
+#define	NULLDFSBNO	((xfs_dfsbno_t)-1)
+#define	NULLDRFSBNO	((xfs_drfsbno_t)-1)
+#define	NULLDRTBNO	((xfs_drtbno_t)-1)
+#define	NULLDFILOFF	((xfs_dfiloff_t)-1)
+
+#define	NULLFSBLOCK	((xfs_fsblock_t)-1)
+#define	NULLRFSBLOCK	((xfs_rfsblock_t)-1)
+#define	NULLRTBLOCK	((xfs_rtblock_t)-1)
+#define	NULLFILEOFF	((xfs_fileoff_t)-1)
+
+#define	NULLAGBLOCK	((xfs_agblock_t)-1)
+#define	NULLAGNUMBER	((xfs_agnumber_t)-1)
+#define	NULLEXTNUM	((xfs_extnum_t)-1)
+
+#define NULLCOMMITLSN	((xfs_lsn_t)-1)
+
+/*
+ * Max values for extlen, extnum, aextnum.
+ */
+#define	MAXEXTLEN	((xfs_extlen_t)0x001fffff)	/* 21 bits */
+#define	MAXEXTNUM	((xfs_extnum_t)0x7fffffff)	/* signed int */
+#define	MAXAEXTNUM	((xfs_aextnum_t)0x7fff)		/* signed short */
+
+/*
+ * Min numbers of data/attr fork btree root pointers.
+ */
+#define MINDBTPTRS	3
+#define MINABTPTRS	2
+
+/*
+ * MAXNAMELEN is the length (including the terminating null) of
+ * the longest permissible file (component) name.
+ */
+#define MAXNAMELEN	256
+
+typedef enum {
+	XFS_LOOKUP_EQi, XFS_LOOKUP_LEi, XFS_LOOKUP_GEi
+} xfs_lookup_t;
+
+typedef enum {
+	XFS_BTNUM_BNOi, XFS_BTNUM_CNTi, XFS_BTNUM_BMAPi, XFS_BTNUM_INOi,
+	XFS_BTNUM_MAX
+} xfs_btnum_t;
+
+struct xfs_name {
+	const unsigned char	*name;
+	int			len;
+};
+
+#endif	/* XFS_TYPES_H_ */
diff --git a/core/ldlinux.asm b/core/ldlinux.asm
index a2f859d0..a1f96b77 100644
--- a/core/ldlinux.asm
+++ b/core/ldlinux.asm
@@ -39,6 +39,8 @@ ROOT_FS_OPS:
 		dd ext2_fs_ops
 		extern ntfs_fs_ops
 		dd ntfs_fs_ops
+		extern xfs_fs_ops
+		dd xfs_fs_ops
 		extern btrfs_fs_ops
 		dd btrfs_fs_ops
 		dd 0