fs/xfs/xfs_sb.h - android_kernel_htc_msm8960 - Gitiles

 /*
  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
  * All Rights Reserved.
  *
  * 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__

 /*
  * 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		0x58465342	/* '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_MOREBITSBIT	0x8000
 #define	XFS_SB_VERSION_OKSASHFBITS	\
 	(XFS_SB_VERSION_EXTFLGBIT | \
 	 XFS_SB_VERSION_DIRV2BIT)
 #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_OKSASHBITS	\
 	(XFS_SB_VERSION_NUMBITS | \
 	 XFS_SB_VERSION_REALFBITS | \
 	 XFS_SB_VERSION_OKSASHFBITS)
 #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_RESERVED2BIT	0x00000002
 #define XFS_SB_VERSION2_RESERVED4BIT	0x00000004
 #define XFS_SB_VERSION2_ATTR2BIT	0x00000008	/* Inline attr rework */
 #define XFS_SB_VERSION2_SASHFBITS	0xff000000	/* Mask: features that
 							   require changing
 							   PROM and SASH */

 #define	XFS_SB_VERSION2_OKREALFBITS	\
 	(XFS_SB_VERSION2_ATTR2BIT)
 #define	XFS_SB_VERSION2_OKSASHFBITS	\
 	(0)
 #define XFS_SB_VERSION2_OKREALBITS	\
 	(XFS_SB_VERSION2_OKREALFBITS |	\
 	 XFS_SB_VERSION2_OKSASHFBITS )

 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 */
 } 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_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_FEATURES2	XFS_SB_MVAL(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_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)

 #define	XFS_SB_GOOD_VERSION(sbp)	xfs_sb_good_version(sbp)
 #ifdef __KERNEL__
 static inline int xfs_sb_good_version(xfs_sb_t *sbp)
 {
 	return (((sbp->sb_versionnum >= XFS_SB_VERSION_1) && \
 		  (sbp->sb_versionnum <= XFS_SB_VERSION_3)) || \
 		   ((XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) && \
 		    !((sbp->sb_versionnum & ~XFS_SB_VERSION_OKREALBITS) || \
 		      ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) && \
 		       (sbp->sb_features2 & ~XFS_SB_VERSION2_OKREALBITS))) && \
 	  	    (sbp->sb_shared_vn <= XFS_SB_MAX_SHARED_VN)));
 }
 #else
 static inline int xfs_sb_good_version(xfs_sb_t *sbp)
 {
 	return (((sbp->sb_versionnum >= XFS_SB_VERSION_1) && \
 		  (sbp->sb_versionnum <= XFS_SB_VERSION_3)) || \
 		   ((XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) && \
 		    !((sbp->sb_versionnum & ~XFS_SB_VERSION_OKREALBITS) || \
 		      ((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) && \
 		       (sbp->sb_features2 & ~XFS_SB_VERSION2_OKREALBITS))) && \
 		  (!(sbp->sb_versionnum & XFS_SB_VERSION_SHAREDBIT) || \
 		   (sbp->sb_shared_vn <= XFS_SB_MAX_SHARED_VN))));
 }
 #endif /* __KERNEL__ */

 #define	XFS_SB_GOOD_SASH_VERSION(sbp)	\
 	((((sbp)->sb_versionnum >= XFS_SB_VERSION_1) && \
 	  ((sbp)->sb_versionnum <= XFS_SB_VERSION_3)) || \
 	 ((XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) && \
 	  !((sbp)->sb_versionnum & ~XFS_SB_VERSION_OKSASHBITS)))

 #define	XFS_SB_VERSION_TONEW(v)	xfs_sb_version_tonew(v)
 static inline unsigned xfs_sb_version_tonew(unsigned v)
 {
 	return ((((v) == XFS_SB_VERSION_1) ? \
 		0 : \
 		(((v) == XFS_SB_VERSION_2) ? \
 			XFS_SB_VERSION_ATTRBIT : \
 			(XFS_SB_VERSION_ATTRBIT | XFS_SB_VERSION_NLINKBIT))) | \
 		XFS_SB_VERSION_4);
 }

 #define	XFS_SB_VERSION_TOOLD(v)	xfs_sb_version_toold(v)
 static inline unsigned xfs_sb_version_toold(unsigned v)
 {
 	return (((v) & (XFS_SB_VERSION_QUOTABIT | XFS_SB_VERSION_ALIGNBIT)) ? \
 		0 : \
 		(((v) & XFS_SB_VERSION_NLINKBIT) ? \
 			XFS_SB_VERSION_3 : \
 			(((v) & XFS_SB_VERSION_ATTRBIT) ?  \
 				XFS_SB_VERSION_2 : \
 				XFS_SB_VERSION_1)));
 }

 #define	XFS_SB_VERSION_HASATTR(sbp)	xfs_sb_version_hasattr(sbp)
 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));
 }

 #define	XFS_SB_VERSION_ADDATTR(sbp)	xfs_sb_version_addattr(sbp)
 static inline void xfs_sb_version_addattr(xfs_sb_t *sbp)
 {
 	(sbp)->sb_versionnum = (((sbp)->sb_versionnum == XFS_SB_VERSION_1) ? \
 		XFS_SB_VERSION_2 : \
 		((XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) ? \
 			((sbp)->sb_versionnum | XFS_SB_VERSION_ATTRBIT) : \
 			(XFS_SB_VERSION_4 | XFS_SB_VERSION_ATTRBIT)));
 }

 #define	XFS_SB_VERSION_HASNLINK(sbp)	xfs_sb_version_hasnlink(sbp)
 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));
 }

 #define	XFS_SB_VERSION_ADDNLINK(sbp)	xfs_sb_version_addnlink(sbp)
 static inline void xfs_sb_version_addnlink(xfs_sb_t *sbp)
 {
 	(sbp)->sb_versionnum = ((sbp)->sb_versionnum <= XFS_SB_VERSION_2 ? \
 		XFS_SB_VERSION_3 : \
 		((sbp)->sb_versionnum | XFS_SB_VERSION_NLINKBIT));
 }

 #define	XFS_SB_VERSION_HASQUOTA(sbp)	xfs_sb_version_hasquota(sbp)
 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);
 }

 #define	XFS_SB_VERSION_ADDQUOTA(sbp)	xfs_sb_version_addquota(sbp)
 static inline void xfs_sb_version_addquota(xfs_sb_t *sbp)
 {
 	(sbp)->sb_versionnum = \
 		 (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 ? \
 			((sbp)->sb_versionnum | XFS_SB_VERSION_QUOTABIT) : \
 			(XFS_SB_VERSION_TONEW((sbp)->sb_versionnum) | \
 			 XFS_SB_VERSION_QUOTABIT));
 }

 #define	XFS_SB_VERSION_HASALIGN(sbp)	xfs_sb_version_hasalign(sbp)
 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);
 }

 #define	XFS_SB_VERSION_SUBALIGN(sbp)	xfs_sb_version_subalign(sbp)
 static inline void xfs_sb_version_subalign(xfs_sb_t *sbp)
 {
 	(sbp)->sb_versionnum = \
 	 XFS_SB_VERSION_TOOLD((sbp)->sb_versionnum & ~XFS_SB_VERSION_ALIGNBIT);
 }

 #define XFS_SB_VERSION_HASDALIGN(sbp)	xfs_sb_version_hasdalign(sbp)
 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);
 }

 #define XFS_SB_VERSION_ADDDALIGN(sbp)	xfs_sb_version_adddalign(sbp)
 static inline int xfs_sb_version_adddalign(xfs_sb_t *sbp)
 {
 	return (sbp)->sb_versionnum = \
 		((sbp)->sb_versionnum | XFS_SB_VERSION_DALIGNBIT);
 }

 #define XFS_SB_VERSION_HASSHARED(sbp)	xfs_sb_version_hasshared(sbp)
 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);
 }

 #define XFS_SB_VERSION_ADDSHARED(sbp)	xfs_sb_version_addshared(sbp)
 static inline int xfs_sb_version_addshared(xfs_sb_t *sbp)
 {
 	return (sbp)->sb_versionnum = \
 		((sbp)->sb_versionnum | XFS_SB_VERSION_SHAREDBIT);
 }

 #define XFS_SB_VERSION_SUBSHARED(sbp)	xfs_sb_version_subshared(sbp)
 static inline int xfs_sb_version_subshared(xfs_sb_t *sbp)
 {
 	return (sbp)->sb_versionnum = \
 		((sbp)->sb_versionnum & ~XFS_SB_VERSION_SHAREDBIT);
 }

 #define XFS_SB_VERSION_HASDIRV2(sbp)	xfs_sb_version_hasdirv2(sbp)
 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);
 }

 #define XFS_SB_VERSION_HASLOGV2(sbp)   xfs_sb_version_haslogv2(sbp)
 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);
 }

 #define XFS_SB_VERSION_HASEXTFLGBIT(sbp)	xfs_sb_version_hasextflgbit(sbp)
 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);
 }

 #define XFS_SB_VERSION_ADDEXTFLGBIT(sbp)	xfs_sb_version_addextflgbit(sbp)
 static inline int xfs_sb_version_addextflgbit(xfs_sb_t *sbp)
 {
 	return (sbp)->sb_versionnum = \
 		((sbp)->sb_versionnum | XFS_SB_VERSION_EXTFLGBIT);
 }

 #define XFS_SB_VERSION_SUBEXTFLGBIT(sbp)	xfs_sb_version_subextflgbit(sbp)
 static inline int xfs_sb_version_subextflgbit(xfs_sb_t *sbp)
 {
 	return (sbp)->sb_versionnum = \
 		((sbp)->sb_versionnum & ~XFS_SB_VERSION_EXTFLGBIT);
 }

 #define XFS_SB_VERSION_HASSECTOR(sbp)   xfs_sb_version_hassector(sbp)
 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);
 }

 #define XFS_SB_VERSION_HASMOREBITS(sbp)	xfs_sb_version_hasmorebits(sbp)
 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)
  */

 #define XFS_SB_VERSION_HASATTR2(sbp)	xfs_sb_version_hasattr2(sbp)
 static inline int xfs_sb_version_hasattr2(xfs_sb_t *sbp)
 {
 	return (XFS_SB_VERSION_HASMOREBITS(sbp)) &&	\
 		((sbp)->sb_features2 & XFS_SB_VERSION2_ATTR2BIT);
 }

 #define XFS_SB_VERSION_ADDATTR2(sbp)	xfs_sb_version_addattr2(sbp)
 static inline void xfs_sb_version_addattr2(xfs_sb_t *sbp)
 {
 	((sbp)->sb_versionnum =	\
 		((sbp)->sb_versionnum | XFS_SB_VERSION_MOREBITSBIT),	\
 	((sbp)->sb_features2 =	\
 		((sbp)->sb_features2 | XFS_SB_VERSION2_ATTR2BIT)));
 }

 /*
  * 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_sb_t *)XFS_BUF_PTR(bp))

 #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)
 #define XFS_BB_TO_FSS(mp,bb)	\
 	(((bb) + (XFS_FSS_TO_BB(mp,1) - 1)) >> (mp)->m_sectbb_log)
 #define XFS_BB_TO_FSST(mp,bb)	((bb) >> (mp)->m_sectbb_log)

 /*
  * File system sector to byte conversions.
  */
 #define XFS_FSS_TO_B(mp,sectno)	((xfs_fsize_t)(sectno) << (mp)->m_sb.sb_sectlog)
 #define XFS_B_TO_FSST(mp,b)	(((__uint64_t)(b)) >> (mp)->m_sb.sb_sectlog)

 /*
  * 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)
 #define	XFS_BB_FSB_OFFSET(mp,bb) ((bb) & ((mp)->m_bsize - 1))

 /*
  * 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__ */
	/*
	* Copyright (c) 2000-2005 Silicon Graphics, Inc.
	* All Rights Reserved.
	*
	* 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__

	/*
	* 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 0x58465342 /* '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_MOREBITSBIT 0x8000
	#define XFS_SB_VERSION_OKSASHFBITS \
	(XFS_SB_VERSION_EXTFLGBIT \| \
	XFS_SB_VERSION_DIRV2BIT)
	#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_OKSASHBITS \
	(XFS_SB_VERSION_NUMBITS \| \
	XFS_SB_VERSION_REALFBITS \| \
	XFS_SB_VERSION_OKSASHFBITS)
	#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_RESERVED2BIT 0x00000002
	#define XFS_SB_VERSION2_RESERVED4BIT 0x00000004
	#define XFS_SB_VERSION2_ATTR2BIT 0x00000008 /* Inline attr rework */
	#define XFS_SB_VERSION2_SASHFBITS 0xff000000 /* Mask: features that
	require changing
	PROM and SASH */

	#define XFS_SB_VERSION2_OKREALFBITS \
	(XFS_SB_VERSION2_ATTR2BIT)
	#define XFS_SB_VERSION2_OKSASHFBITS \
	(0)
	#define XFS_SB_VERSION2_OKREALBITS \
	(XFS_SB_VERSION2_OKREALFBITS \| \
	XFS_SB_VERSION2_OKSASHFBITS )

	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 */
	} 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_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_FEATURES2 XFS_SB_MVAL(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_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)

	#define XFS_SB_GOOD_VERSION(sbp) xfs_sb_good_version(sbp)
	#ifdef __KERNEL__
	static inline int xfs_sb_good_version(xfs_sb_t *sbp)
	{
	return (((sbp->sb_versionnum >= XFS_SB_VERSION_1) && \
	(sbp->sb_versionnum <= XFS_SB_VERSION_3)) \|\| \
	((XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) && \
	!((sbp->sb_versionnum & ~XFS_SB_VERSION_OKREALBITS) \|\| \
	((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) && \
	(sbp->sb_features2 & ~XFS_SB_VERSION2_OKREALBITS))) && \
	(sbp->sb_shared_vn <= XFS_SB_MAX_SHARED_VN)));
	}
	#else
	static inline int xfs_sb_good_version(xfs_sb_t *sbp)
	{
	return (((sbp->sb_versionnum >= XFS_SB_VERSION_1) && \
	(sbp->sb_versionnum <= XFS_SB_VERSION_3)) \|\| \
	((XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) && \
	!((sbp->sb_versionnum & ~XFS_SB_VERSION_OKREALBITS) \|\| \
	((sbp->sb_versionnum & XFS_SB_VERSION_MOREBITSBIT) && \
	(sbp->sb_features2 & ~XFS_SB_VERSION2_OKREALBITS))) && \
	(!(sbp->sb_versionnum & XFS_SB_VERSION_SHAREDBIT) \|\| \
	(sbp->sb_shared_vn <= XFS_SB_MAX_SHARED_VN))));
	}
	#endif /* __KERNEL__ */

	#define XFS_SB_GOOD_SASH_VERSION(sbp) \
	((((sbp)->sb_versionnum >= XFS_SB_VERSION_1) && \
	((sbp)->sb_versionnum <= XFS_SB_VERSION_3)) \|\| \
	((XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) && \
	!((sbp)->sb_versionnum & ~XFS_SB_VERSION_OKSASHBITS)))

	#define XFS_SB_VERSION_TONEW(v) xfs_sb_version_tonew(v)
	static inline unsigned xfs_sb_version_tonew(unsigned v)
	{
	return ((((v) == XFS_SB_VERSION_1) ? \
	0 : \
	(((v) == XFS_SB_VERSION_2) ? \
	XFS_SB_VERSION_ATTRBIT : \
	(XFS_SB_VERSION_ATTRBIT \| XFS_SB_VERSION_NLINKBIT))) \| \
	XFS_SB_VERSION_4);
	}

	#define XFS_SB_VERSION_TOOLD(v) xfs_sb_version_toold(v)
	static inline unsigned xfs_sb_version_toold(unsigned v)
	{
	return (((v) & (XFS_SB_VERSION_QUOTABIT \| XFS_SB_VERSION_ALIGNBIT)) ? \
	0 : \
	(((v) & XFS_SB_VERSION_NLINKBIT) ? \
	XFS_SB_VERSION_3 : \
	(((v) & XFS_SB_VERSION_ATTRBIT) ? \
	XFS_SB_VERSION_2 : \
	XFS_SB_VERSION_1)));
	}

	#define XFS_SB_VERSION_HASATTR(sbp) xfs_sb_version_hasattr(sbp)
	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));
	}

	#define XFS_SB_VERSION_ADDATTR(sbp) xfs_sb_version_addattr(sbp)
	static inline void xfs_sb_version_addattr(xfs_sb_t *sbp)
	{
	(sbp)->sb_versionnum = (((sbp)->sb_versionnum == XFS_SB_VERSION_1) ? \
	XFS_SB_VERSION_2 : \
	((XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4) ? \
	((sbp)->sb_versionnum \| XFS_SB_VERSION_ATTRBIT) : \
	(XFS_SB_VERSION_4 \| XFS_SB_VERSION_ATTRBIT)));
	}

	#define XFS_SB_VERSION_HASNLINK(sbp) xfs_sb_version_hasnlink(sbp)
	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));
	}

	#define XFS_SB_VERSION_ADDNLINK(sbp) xfs_sb_version_addnlink(sbp)
	static inline void xfs_sb_version_addnlink(xfs_sb_t *sbp)
	{
	(sbp)->sb_versionnum = ((sbp)->sb_versionnum <= XFS_SB_VERSION_2 ? \
	XFS_SB_VERSION_3 : \
	((sbp)->sb_versionnum \| XFS_SB_VERSION_NLINKBIT));
	}

	#define XFS_SB_VERSION_HASQUOTA(sbp) xfs_sb_version_hasquota(sbp)
	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);
	}

	#define XFS_SB_VERSION_ADDQUOTA(sbp) xfs_sb_version_addquota(sbp)
	static inline void xfs_sb_version_addquota(xfs_sb_t *sbp)
	{
	(sbp)->sb_versionnum = \
	(XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_4 ? \
	((sbp)->sb_versionnum \| XFS_SB_VERSION_QUOTABIT) : \
	(XFS_SB_VERSION_TONEW((sbp)->sb_versionnum) \| \
	XFS_SB_VERSION_QUOTABIT));
	}

	#define XFS_SB_VERSION_HASALIGN(sbp) xfs_sb_version_hasalign(sbp)
	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);
	}

	#define XFS_SB_VERSION_SUBALIGN(sbp) xfs_sb_version_subalign(sbp)
	static inline void xfs_sb_version_subalign(xfs_sb_t *sbp)
	{
	(sbp)->sb_versionnum = \
	XFS_SB_VERSION_TOOLD((sbp)->sb_versionnum & ~XFS_SB_VERSION_ALIGNBIT);
	}

	#define XFS_SB_VERSION_HASDALIGN(sbp) xfs_sb_version_hasdalign(sbp)
	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);
	}

	#define XFS_SB_VERSION_ADDDALIGN(sbp) xfs_sb_version_adddalign(sbp)
	static inline int xfs_sb_version_adddalign(xfs_sb_t *sbp)
	{
	return (sbp)->sb_versionnum = \
	((sbp)->sb_versionnum \| XFS_SB_VERSION_DALIGNBIT);
	}

	#define XFS_SB_VERSION_HASSHARED(sbp) xfs_sb_version_hasshared(sbp)
	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);
	}

	#define XFS_SB_VERSION_ADDSHARED(sbp) xfs_sb_version_addshared(sbp)
	static inline int xfs_sb_version_addshared(xfs_sb_t *sbp)
	{
	return (sbp)->sb_versionnum = \
	((sbp)->sb_versionnum \| XFS_SB_VERSION_SHAREDBIT);
	}

	#define XFS_SB_VERSION_SUBSHARED(sbp) xfs_sb_version_subshared(sbp)
	static inline int xfs_sb_version_subshared(xfs_sb_t *sbp)
	{
	return (sbp)->sb_versionnum = \
	((sbp)->sb_versionnum & ~XFS_SB_VERSION_SHAREDBIT);
	}

	#define XFS_SB_VERSION_HASDIRV2(sbp) xfs_sb_version_hasdirv2(sbp)
	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);
	}

	#define XFS_SB_VERSION_HASLOGV2(sbp) xfs_sb_version_haslogv2(sbp)
	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);
	}

	#define XFS_SB_VERSION_HASEXTFLGBIT(sbp) xfs_sb_version_hasextflgbit(sbp)
	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);
	}

	#define XFS_SB_VERSION_ADDEXTFLGBIT(sbp) xfs_sb_version_addextflgbit(sbp)
	static inline int xfs_sb_version_addextflgbit(xfs_sb_t *sbp)
	{
	return (sbp)->sb_versionnum = \
	((sbp)->sb_versionnum \| XFS_SB_VERSION_EXTFLGBIT);
	}

	#define XFS_SB_VERSION_SUBEXTFLGBIT(sbp) xfs_sb_version_subextflgbit(sbp)
	static inline int xfs_sb_version_subextflgbit(xfs_sb_t *sbp)
	{
	return (sbp)->sb_versionnum = \
	((sbp)->sb_versionnum & ~XFS_SB_VERSION_EXTFLGBIT);
	}

	#define XFS_SB_VERSION_HASSECTOR(sbp) xfs_sb_version_hassector(sbp)
	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);
	}

	#define XFS_SB_VERSION_HASMOREBITS(sbp) xfs_sb_version_hasmorebits(sbp)
	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)
	*/

	#define XFS_SB_VERSION_HASATTR2(sbp) xfs_sb_version_hasattr2(sbp)
	static inline int xfs_sb_version_hasattr2(xfs_sb_t *sbp)
	{
	return (XFS_SB_VERSION_HASMOREBITS(sbp)) && \
	((sbp)->sb_features2 & XFS_SB_VERSION2_ATTR2BIT);
	}

	#define XFS_SB_VERSION_ADDATTR2(sbp) xfs_sb_version_addattr2(sbp)
	static inline void xfs_sb_version_addattr2(xfs_sb_t *sbp)
	{
	((sbp)->sb_versionnum = \
	((sbp)->sb_versionnum \| XFS_SB_VERSION_MOREBITSBIT), \
	((sbp)->sb_features2 = \
	((sbp)->sb_features2 \| XFS_SB_VERSION2_ATTR2BIT)));
	}

	/*
	* 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_sb_t *)XFS_BUF_PTR(bp))

	#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)
	#define XFS_BB_TO_FSS(mp,bb) \
	(((bb) + (XFS_FSS_TO_BB(mp,1) - 1)) >> (mp)->m_sectbb_log)
	#define XFS_BB_TO_FSST(mp,bb) ((bb) >> (mp)->m_sectbb_log)

	/*
	* File system sector to byte conversions.
	*/
	#define XFS_FSS_TO_B(mp,sectno) ((xfs_fsize_t)(sectno) << (mp)->m_sb.sb_sectlog)
	#define XFS_B_TO_FSST(mp,b) (((__uint64_t)(b)) >> (mp)->m_sb.sb_sectlog)

	/*
	* 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)
	#define XFS_BB_FSB_OFFSET(mp,bb) ((bb) & ((mp)->m_bsize - 1))

	/*
	* 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__ */