fs/xfs/libxfs/xfs_rtbitmap.h - linux/torvalds/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
  * All Rights Reserved.
  */
 #ifndef __XFS_RTBITMAP_H__
 #define	__XFS_RTBITMAP_H__

 struct xfs_rtalloc_args {
 	struct xfs_mount	*mp;
 	struct xfs_trans	*tp;

 	struct xfs_buf		*rbmbp;	/* bitmap block buffer */
 	struct xfs_buf		*sumbp;	/* summary block buffer */

 	xfs_fileoff_t		rbmoff;	/* bitmap block number */
 	xfs_fileoff_t		sumoff;	/* summary block number */
 };

 static inline xfs_rtblock_t
 xfs_rtx_to_rtb(
 	struct xfs_mount	*mp,
 	xfs_rtxnum_t		rtx)
 {
 	if (mp->m_rtxblklog >= 0)
 		return rtx << mp->m_rtxblklog;

 	return rtx * mp->m_sb.sb_rextsize;
 }

 static inline xfs_extlen_t
 xfs_rtxlen_to_extlen(
 	struct xfs_mount	*mp,
 	xfs_rtxlen_t		rtxlen)
 {
 	if (mp->m_rtxblklog >= 0)
 		return rtxlen << mp->m_rtxblklog;

 	return rtxlen * mp->m_sb.sb_rextsize;
 }

 /* Compute the misalignment between an extent length and a realtime extent .*/
 static inline unsigned int
 xfs_extlen_to_rtxmod(
 	struct xfs_mount	*mp,
 	xfs_extlen_t		len)
 {
 	if (mp->m_rtxblklog >= 0)
 		return len & mp->m_rtxblkmask;

 	return len % mp->m_sb.sb_rextsize;
 }

 static inline xfs_rtxlen_t
 xfs_extlen_to_rtxlen(
 	struct xfs_mount	*mp,
 	xfs_extlen_t		len)
 {
 	if (mp->m_rtxblklog >= 0)
 		return len >> mp->m_rtxblklog;

 	return len / mp->m_sb.sb_rextsize;
 }

 /* Convert an rt block number into an rt extent number. */
 static inline xfs_rtxnum_t
 xfs_rtb_to_rtx(
 	struct xfs_mount	*mp,
 	xfs_rtblock_t		rtbno)
 {
 	if (likely(mp->m_rtxblklog >= 0))
 		return rtbno >> mp->m_rtxblklog;

 	return div_u64(rtbno, mp->m_sb.sb_rextsize);
 }

 /* Return the offset of an rt block number within an rt extent. */
 static inline xfs_extlen_t
 xfs_rtb_to_rtxoff(
 	struct xfs_mount	*mp,
 	xfs_rtblock_t		rtbno)
 {
 	if (likely(mp->m_rtxblklog >= 0))
 		return rtbno & mp->m_rtxblkmask;

 	return do_div(rtbno, mp->m_sb.sb_rextsize);
 }

 /*
  * Crack an rt block number into an rt extent number and an offset within that
  * rt extent.  Returns the rt extent number directly and the offset in @off.
  */
 static inline xfs_rtxnum_t
 xfs_rtb_to_rtxrem(
 	struct xfs_mount	*mp,
 	xfs_rtblock_t		rtbno,
 	xfs_extlen_t		*off)
 {
 	if (likely(mp->m_rtxblklog >= 0)) {
 		*off = rtbno & mp->m_rtxblkmask;
 		return rtbno >> mp->m_rtxblklog;
 	}

 	return div_u64_rem(rtbno, mp->m_sb.sb_rextsize, off);
 }

 /*
  * Convert an rt block number into an rt extent number, rounding up to the next
  * rt extent if the rt block is not aligned to an rt extent boundary.
  */
 static inline xfs_rtxnum_t
 xfs_rtb_to_rtxup(
 	struct xfs_mount	*mp,
 	xfs_rtblock_t		rtbno)
 {
 	if (likely(mp->m_rtxblklog >= 0)) {
 		if (rtbno & mp->m_rtxblkmask)
 			return (rtbno >> mp->m_rtxblklog) + 1;
 		return rtbno >> mp->m_rtxblklog;
 	}

 	if (do_div(rtbno, mp->m_sb.sb_rextsize))
 		rtbno++;
 	return rtbno;
 }

 /* Round this rtblock up to the nearest rt extent size. */
 static inline xfs_rtblock_t
 xfs_rtb_roundup_rtx(
 	struct xfs_mount	*mp,
 	xfs_rtblock_t		rtbno)
 {
 	return roundup_64(rtbno, mp->m_sb.sb_rextsize);
 }

 /* Round this rtblock down to the nearest rt extent size. */
 static inline xfs_rtblock_t
 xfs_rtb_rounddown_rtx(
 	struct xfs_mount	*mp,
 	xfs_rtblock_t		rtbno)
 {
 	return rounddown_64(rtbno, mp->m_sb.sb_rextsize);
 }

 /* Convert an rt extent number to a file block offset in the rt bitmap file. */
 static inline xfs_fileoff_t
 xfs_rtx_to_rbmblock(
 	struct xfs_mount	*mp,
 	xfs_rtxnum_t		rtx)
 {
 	return rtx >> mp->m_blkbit_log;
 }

 /* Convert an rt extent number to a word offset within an rt bitmap block. */
 static inline unsigned int
 xfs_rtx_to_rbmword(
 	struct xfs_mount	*mp,
 	xfs_rtxnum_t		rtx)
 {
 	return (rtx >> XFS_NBWORDLOG) & (mp->m_blockwsize - 1);
 }

 /* Convert a file block offset in the rt bitmap file to an rt extent number. */
 static inline xfs_rtxnum_t
 xfs_rbmblock_to_rtx(
 	struct xfs_mount	*mp,
 	xfs_fileoff_t		rbmoff)
 {
 	return rbmoff << mp->m_blkbit_log;
 }

 /* Return a pointer to a bitmap word within a rt bitmap block. */
 static inline union xfs_rtword_raw *
 xfs_rbmblock_wordptr(
 	struct xfs_rtalloc_args	*args,
 	unsigned int		index)
 {
 	union xfs_rtword_raw	*words = args->rbmbp->b_addr;

 	return words + index;
 }

 /* Convert an ondisk bitmap word to its incore representation. */
 static inline xfs_rtword_t
 xfs_rtbitmap_getword(
 	struct xfs_rtalloc_args	*args,
 	unsigned int		index)
 {
 	union xfs_rtword_raw	*word = xfs_rbmblock_wordptr(args, index);

 	return word->old;
 }

 /* Set an ondisk bitmap word from an incore representation. */
 static inline void
 xfs_rtbitmap_setword(
 	struct xfs_rtalloc_args	*args,
 	unsigned int		index,
 	xfs_rtword_t		value)
 {
 	union xfs_rtword_raw	*word = xfs_rbmblock_wordptr(args, index);

 	word->old = value;
 }

 /*
  * Convert a rt extent length and rt bitmap block number to a xfs_suminfo_t
  * offset within the rt summary file.
  */
 static inline xfs_rtsumoff_t
 xfs_rtsumoffs(
 	struct xfs_mount	*mp,
 	int			log2_len,
 	xfs_fileoff_t		rbmoff)
 {
 	return log2_len * mp->m_sb.sb_rbmblocks + rbmoff;
 }

 /*
  * Convert an xfs_suminfo_t offset to a file block offset within the rt summary
  * file.
  */
 static inline xfs_fileoff_t
 xfs_rtsumoffs_to_block(
 	struct xfs_mount	*mp,
 	xfs_rtsumoff_t		rsumoff)
 {
 	return XFS_B_TO_FSBT(mp, rsumoff * sizeof(xfs_suminfo_t));
 }

 /*
  * Convert an xfs_suminfo_t offset to an info word offset within an rt summary
  * block.
  */
 static inline unsigned int
 xfs_rtsumoffs_to_infoword(
 	struct xfs_mount	*mp,
 	xfs_rtsumoff_t		rsumoff)
 {
 	unsigned int		mask = mp->m_blockmask >> XFS_SUMINFOLOG;

 	return rsumoff & mask;
 }

 /* Return a pointer to a summary info word within a rt summary block. */
 static inline union xfs_suminfo_raw *
 xfs_rsumblock_infoptr(
 	struct xfs_rtalloc_args	*args,
 	unsigned int		index)
 {
 	union xfs_suminfo_raw	*info = args->sumbp->b_addr;

 	return info + index;
 }

 /* Get the current value of a summary counter. */
 static inline xfs_suminfo_t
 xfs_suminfo_get(
 	struct xfs_rtalloc_args	*args,
 	unsigned int		index)
 {
 	union xfs_suminfo_raw	*info = xfs_rsumblock_infoptr(args, index);

 	return info->old;
 }

 /* Add to the current value of a summary counter and return the new value. */
 static inline xfs_suminfo_t
 xfs_suminfo_add(
 	struct xfs_rtalloc_args	*args,
 	unsigned int		index,
 	int			delta)
 {
 	union xfs_suminfo_raw	*info = xfs_rsumblock_infoptr(args, index);

 	info->old += delta;
 	return info->old;
 }

 /*
  * Functions for walking free space rtextents in the realtime bitmap.
  */
 struct xfs_rtalloc_rec {
 	xfs_rtxnum_t		ar_startext;
 	xfs_rtbxlen_t		ar_extcount;
 };

 typedef int (*xfs_rtalloc_query_range_fn)(
 	struct xfs_mount		*mp,
 	struct xfs_trans		*tp,
 	const struct xfs_rtalloc_rec	*rec,
 	void				*priv);

 #ifdef CONFIG_XFS_RT
 void xfs_rtbuf_cache_relse(struct xfs_rtalloc_args *args);

 int xfs_rtbuf_get(struct xfs_rtalloc_args *args, xfs_fileoff_t block,
 		int issum);

 static inline int
 xfs_rtbitmap_read_buf(
 	struct xfs_rtalloc_args		*args,
 	xfs_fileoff_t			block)
 {
 	return xfs_rtbuf_get(args, block, 0);
 }

 static inline int
 xfs_rtsummary_read_buf(
 	struct xfs_rtalloc_args		*args,
 	xfs_fileoff_t			block)
 {
 	return xfs_rtbuf_get(args, block, 1);
 }

 int xfs_rtcheck_range(struct xfs_rtalloc_args *args, xfs_rtxnum_t start,
 		xfs_rtxlen_t len, int val, xfs_rtxnum_t *new, int *stat);
 int xfs_rtfind_back(struct xfs_rtalloc_args *args, xfs_rtxnum_t start,
 		xfs_rtxnum_t limit, xfs_rtxnum_t *rtblock);
 int xfs_rtfind_forw(struct xfs_rtalloc_args *args, xfs_rtxnum_t start,
 		xfs_rtxnum_t limit, xfs_rtxnum_t *rtblock);
 int xfs_rtmodify_range(struct xfs_rtalloc_args *args, xfs_rtxnum_t start,
 		xfs_rtxlen_t len, int val);
 int xfs_rtget_summary(struct xfs_rtalloc_args *args, int log,
 		xfs_fileoff_t bbno, xfs_suminfo_t *sum);
 int xfs_rtmodify_summary(struct xfs_rtalloc_args *args, int log,
 		xfs_fileoff_t bbno, int delta);
 int xfs_rtfree_range(struct xfs_rtalloc_args *args, xfs_rtxnum_t start,
 		xfs_rtxlen_t len);
 int xfs_rtalloc_query_range(struct xfs_mount *mp, struct xfs_trans *tp,
 		const struct xfs_rtalloc_rec *low_rec,
 		const struct xfs_rtalloc_rec *high_rec,
 		xfs_rtalloc_query_range_fn fn, void *priv);
 int xfs_rtalloc_query_all(struct xfs_mount *mp, struct xfs_trans *tp,
 			  xfs_rtalloc_query_range_fn fn,
 			  void *priv);
 int xfs_rtalloc_extent_is_free(struct xfs_mount *mp, struct xfs_trans *tp,
 			       xfs_rtxnum_t start, xfs_rtxlen_t len,
 			       bool *is_free);
 /*
  * Free an extent in the realtime subvolume.  Length is expressed in
  * realtime extents, as is the block number.
  */
 int					/* error */
 xfs_rtfree_extent(
 	struct xfs_trans	*tp,	/* transaction pointer */
 	xfs_rtxnum_t		start,	/* starting rtext number to free */
 	xfs_rtxlen_t		len);	/* length of extent freed */

 /* Same as above, but in units of rt blocks. */
 int xfs_rtfree_blocks(struct xfs_trans *tp, xfs_fsblock_t rtbno,
 		xfs_filblks_t rtlen);

 xfs_filblks_t xfs_rtbitmap_blockcount(struct xfs_mount *mp, xfs_rtbxlen_t
 		rtextents);
 unsigned long long xfs_rtbitmap_wordcount(struct xfs_mount *mp,
 		xfs_rtbxlen_t rtextents);

 xfs_filblks_t xfs_rtsummary_blockcount(struct xfs_mount *mp,
 		unsigned int rsumlevels, xfs_extlen_t rbmblocks);
 unsigned long long xfs_rtsummary_wordcount(struct xfs_mount *mp,
 		unsigned int rsumlevels, xfs_extlen_t rbmblocks);

 void xfs_rtbitmap_lock(struct xfs_trans *tp, struct xfs_mount *mp);
 void xfs_rtbitmap_unlock(struct xfs_mount *mp);

 /* Lock the rt bitmap inode in shared mode */
 #define XFS_RBMLOCK_BITMAP	(1U << 0)
 /* Lock the rt summary inode in shared mode */
 #define XFS_RBMLOCK_SUMMARY	(1U << 1)

 void xfs_rtbitmap_lock_shared(struct xfs_mount *mp,
 		unsigned int rbmlock_flags);
 void xfs_rtbitmap_unlock_shared(struct xfs_mount *mp,
 		unsigned int rbmlock_flags);
 #else /* CONFIG_XFS_RT */
 # define xfs_rtfree_extent(t,b,l)			(-ENOSYS)
 # define xfs_rtfree_blocks(t,rb,rl)			(-ENOSYS)
 # define xfs_rtalloc_query_range(m,t,l,h,f,p)		(-ENOSYS)
 # define xfs_rtalloc_query_all(m,t,f,p)			(-ENOSYS)
 # define xfs_rtbitmap_read_buf(a,b)			(-ENOSYS)
 # define xfs_rtsummary_read_buf(a,b)			(-ENOSYS)
 # define xfs_rtbuf_cache_relse(a)			(0)
 # define xfs_rtalloc_extent_is_free(m,t,s,l,i)		(-ENOSYS)
 static inline xfs_filblks_t
 xfs_rtbitmap_blockcount(struct xfs_mount *mp, xfs_rtbxlen_t rtextents)
 {
 	/* shut up gcc */
 	return 0;
 }
 # define xfs_rtbitmap_wordcount(mp, r)			(0)
 # define xfs_rtsummary_blockcount(mp, l, b)		(0)
 # define xfs_rtsummary_wordcount(mp, l, b)		(0)
 # define xfs_rtbitmap_lock(tp, mp)		do { } while (0)
 # define xfs_rtbitmap_unlock(mp)		do { } while (0)
 # define xfs_rtbitmap_lock_shared(mp, lf)	do { } while (0)
 # define xfs_rtbitmap_unlock_shared(mp, lf)	do { } while (0)
 #endif /* CONFIG_XFS_RT */

 #endif /* __XFS_RTBITMAP_H__ */
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
	* All Rights Reserved.
	*/
	#ifndef __XFS_RTBITMAP_H__
	#define __XFS_RTBITMAP_H__

	struct xfs_rtalloc_args {
	struct xfs_mount *mp;
	struct xfs_trans *tp;

	struct xfs_buf rbmbp; / bitmap block buffer */
	struct xfs_buf sumbp; / summary block buffer */

	xfs_fileoff_t rbmoff; /* bitmap block number */
	xfs_fileoff_t sumoff; /* summary block number */
	};

	static inline xfs_rtblock_t
	xfs_rtx_to_rtb(
	struct xfs_mount *mp,
	xfs_rtxnum_t rtx)
	{
	if (mp->m_rtxblklog >= 0)
	return rtx << mp->m_rtxblklog;

	return rtx * mp->m_sb.sb_rextsize;
	}

	static inline xfs_extlen_t
	xfs_rtxlen_to_extlen(
	struct xfs_mount *mp,
	xfs_rtxlen_t rtxlen)
	{
	if (mp->m_rtxblklog >= 0)
	return rtxlen << mp->m_rtxblklog;

	return rtxlen * mp->m_sb.sb_rextsize;
	}

	/* Compute the misalignment between an extent length and a realtime extent .*/
	static inline unsigned int
	xfs_extlen_to_rtxmod(
	struct xfs_mount *mp,
	xfs_extlen_t len)
	{
	if (mp->m_rtxblklog >= 0)
	return len & mp->m_rtxblkmask;

	return len % mp->m_sb.sb_rextsize;
	}

	static inline xfs_rtxlen_t
	xfs_extlen_to_rtxlen(
	struct xfs_mount *mp,
	xfs_extlen_t len)
	{
	if (mp->m_rtxblklog >= 0)
	return len >> mp->m_rtxblklog;

	return len / mp->m_sb.sb_rextsize;
	}

	/* Convert an rt block number into an rt extent number. */
	static inline xfs_rtxnum_t
	xfs_rtb_to_rtx(
	struct xfs_mount *mp,
	xfs_rtblock_t rtbno)
	{
	if (likely(mp->m_rtxblklog >= 0))
	return rtbno >> mp->m_rtxblklog;

	return div_u64(rtbno, mp->m_sb.sb_rextsize);
	}

	/* Return the offset of an rt block number within an rt extent. */
	static inline xfs_extlen_t
	xfs_rtb_to_rtxoff(
	struct xfs_mount *mp,
	xfs_rtblock_t rtbno)
	{
	if (likely(mp->m_rtxblklog >= 0))
	return rtbno & mp->m_rtxblkmask;

	return do_div(rtbno, mp->m_sb.sb_rextsize);
	}

	/*
	* Crack an rt block number into an rt extent number and an offset within that
	* rt extent. Returns the rt extent number directly and the offset in @off.
	*/
	static inline xfs_rtxnum_t
	xfs_rtb_to_rtxrem(
	struct xfs_mount *mp,
	xfs_rtblock_t rtbno,
	xfs_extlen_t *off)
	{
	if (likely(mp->m_rtxblklog >= 0)) {
	*off = rtbno & mp->m_rtxblkmask;
	return rtbno >> mp->m_rtxblklog;
	}

	return div_u64_rem(rtbno, mp->m_sb.sb_rextsize, off);
	}

	/*
	* Convert an rt block number into an rt extent number, rounding up to the next
	* rt extent if the rt block is not aligned to an rt extent boundary.
	*/
	static inline xfs_rtxnum_t
	xfs_rtb_to_rtxup(
	struct xfs_mount *mp,
	xfs_rtblock_t rtbno)
	{
	if (likely(mp->m_rtxblklog >= 0)) {
	if (rtbno & mp->m_rtxblkmask)
	return (rtbno >> mp->m_rtxblklog) + 1;
	return rtbno >> mp->m_rtxblklog;
	}

	if (do_div(rtbno, mp->m_sb.sb_rextsize))
	rtbno++;
	return rtbno;
	}

	/* Round this rtblock up to the nearest rt extent size. */
	static inline xfs_rtblock_t
	xfs_rtb_roundup_rtx(
	struct xfs_mount *mp,
	xfs_rtblock_t rtbno)
	{
	return roundup_64(rtbno, mp->m_sb.sb_rextsize);
	}

	/* Round this rtblock down to the nearest rt extent size. */
	static inline xfs_rtblock_t
	xfs_rtb_rounddown_rtx(
	struct xfs_mount *mp,
	xfs_rtblock_t rtbno)
	{
	return rounddown_64(rtbno, mp->m_sb.sb_rextsize);
	}

	/* Convert an rt extent number to a file block offset in the rt bitmap file. */
	static inline xfs_fileoff_t
	xfs_rtx_to_rbmblock(
	struct xfs_mount *mp,
	xfs_rtxnum_t rtx)
	{
	return rtx >> mp->m_blkbit_log;
	}

	/* Convert an rt extent number to a word offset within an rt bitmap block. */
	static inline unsigned int
	xfs_rtx_to_rbmword(
	struct xfs_mount *mp,
	xfs_rtxnum_t rtx)
	{
	return (rtx >> XFS_NBWORDLOG) & (mp->m_blockwsize - 1);
	}

	/* Convert a file block offset in the rt bitmap file to an rt extent number. */
	static inline xfs_rtxnum_t
	xfs_rbmblock_to_rtx(
	struct xfs_mount *mp,
	xfs_fileoff_t rbmoff)
	{
	return rbmoff << mp->m_blkbit_log;
	}

	/* Return a pointer to a bitmap word within a rt bitmap block. */
	static inline union xfs_rtword_raw *
	xfs_rbmblock_wordptr(
	struct xfs_rtalloc_args *args,
	unsigned int index)
	{
	union xfs_rtword_raw *words = args->rbmbp->b_addr;

	return words + index;
	}

	/* Convert an ondisk bitmap word to its incore representation. */
	static inline xfs_rtword_t
	xfs_rtbitmap_getword(
	struct xfs_rtalloc_args *args,
	unsigned int index)
	{
	union xfs_rtword_raw *word = xfs_rbmblock_wordptr(args, index);

	return word->old;
	}

	/* Set an ondisk bitmap word from an incore representation. */
	static inline void
	xfs_rtbitmap_setword(
	struct xfs_rtalloc_args *args,
	unsigned int index,
	xfs_rtword_t value)
	{
	union xfs_rtword_raw *word = xfs_rbmblock_wordptr(args, index);

	word->old = value;
	}

	/*
	* Convert a rt extent length and rt bitmap block number to a xfs_suminfo_t
	* offset within the rt summary file.
	*/
	static inline xfs_rtsumoff_t
	xfs_rtsumoffs(
	struct xfs_mount *mp,
	int log2_len,
	xfs_fileoff_t rbmoff)
	{
	return log2_len * mp->m_sb.sb_rbmblocks + rbmoff;
	}

	/*
	* Convert an xfs_suminfo_t offset to a file block offset within the rt summary
	* file.
	*/
	static inline xfs_fileoff_t
	xfs_rtsumoffs_to_block(
	struct xfs_mount *mp,
	xfs_rtsumoff_t rsumoff)
	{
	return XFS_B_TO_FSBT(mp, rsumoff * sizeof(xfs_suminfo_t));
	}

	/*
	* Convert an xfs_suminfo_t offset to an info word offset within an rt summary
	* block.
	*/
	static inline unsigned int
	xfs_rtsumoffs_to_infoword(
	struct xfs_mount *mp,
	xfs_rtsumoff_t rsumoff)
	{
	unsigned int mask = mp->m_blockmask >> XFS_SUMINFOLOG;

	return rsumoff & mask;
	}

	/* Return a pointer to a summary info word within a rt summary block. */
	static inline union xfs_suminfo_raw *
	xfs_rsumblock_infoptr(
	struct xfs_rtalloc_args *args,
	unsigned int index)
	{
	union xfs_suminfo_raw *info = args->sumbp->b_addr;

	return info + index;
	}

	/* Get the current value of a summary counter. */
	static inline xfs_suminfo_t
	xfs_suminfo_get(
	struct xfs_rtalloc_args *args,
	unsigned int index)
	{
	union xfs_suminfo_raw *info = xfs_rsumblock_infoptr(args, index);

	return info->old;
	}

	/* Add to the current value of a summary counter and return the new value. */
	static inline xfs_suminfo_t
	xfs_suminfo_add(
	struct xfs_rtalloc_args *args,
	unsigned int index,
	int delta)
	{
	union xfs_suminfo_raw *info = xfs_rsumblock_infoptr(args, index);

	info->old += delta;
	return info->old;
	}

	/*
	* Functions for walking free space rtextents in the realtime bitmap.
	*/
	struct xfs_rtalloc_rec {
	xfs_rtxnum_t ar_startext;
	xfs_rtbxlen_t ar_extcount;
	};

	typedef int (*xfs_rtalloc_query_range_fn)(
	struct xfs_mount *mp,
	struct xfs_trans *tp,
	const struct xfs_rtalloc_rec *rec,
	void *priv);

	#ifdef CONFIG_XFS_RT
	void xfs_rtbuf_cache_relse(struct xfs_rtalloc_args *args);

	int xfs_rtbuf_get(struct xfs_rtalloc_args *args, xfs_fileoff_t block,
	int issum);

	static inline int
	xfs_rtbitmap_read_buf(
	struct xfs_rtalloc_args *args,
	xfs_fileoff_t block)
	{
	return xfs_rtbuf_get(args, block, 0);
	}

	static inline int
	xfs_rtsummary_read_buf(
	struct xfs_rtalloc_args *args,
	xfs_fileoff_t block)
	{
	return xfs_rtbuf_get(args, block, 1);
	}

	int xfs_rtcheck_range(struct xfs_rtalloc_args *args, xfs_rtxnum_t start,
	xfs_rtxlen_t len, int val, xfs_rtxnum_t new, int stat);
	int xfs_rtfind_back(struct xfs_rtalloc_args *args, xfs_rtxnum_t start,
	xfs_rtxnum_t limit, xfs_rtxnum_t *rtblock);
	int xfs_rtfind_forw(struct xfs_rtalloc_args *args, xfs_rtxnum_t start,
	xfs_rtxnum_t limit, xfs_rtxnum_t *rtblock);
	int xfs_rtmodify_range(struct xfs_rtalloc_args *args, xfs_rtxnum_t start,
	xfs_rtxlen_t len, int val);
	int xfs_rtget_summary(struct xfs_rtalloc_args *args, int log,
	xfs_fileoff_t bbno, xfs_suminfo_t *sum);
	int xfs_rtmodify_summary(struct xfs_rtalloc_args *args, int log,
	xfs_fileoff_t bbno, int delta);
	int xfs_rtfree_range(struct xfs_rtalloc_args *args, xfs_rtxnum_t start,
	xfs_rtxlen_t len);
	int xfs_rtalloc_query_range(struct xfs_mount mp, struct xfs_trans tp,
	const struct xfs_rtalloc_rec *low_rec,
	const struct xfs_rtalloc_rec *high_rec,
	xfs_rtalloc_query_range_fn fn, void *priv);
	int xfs_rtalloc_query_all(struct xfs_mount mp, struct xfs_trans tp,
	xfs_rtalloc_query_range_fn fn,
	void *priv);
	int xfs_rtalloc_extent_is_free(struct xfs_mount mp, struct xfs_trans tp,
	xfs_rtxnum_t start, xfs_rtxlen_t len,
	bool *is_free);
	/*
	* Free an extent in the realtime subvolume. Length is expressed in
	* realtime extents, as is the block number.
	*/
	int /* error */
	xfs_rtfree_extent(
	struct xfs_trans tp, / transaction pointer */
	xfs_rtxnum_t start, /* starting rtext number to free */
	xfs_rtxlen_t len); /* length of extent freed */

	/* Same as above, but in units of rt blocks. */
	int xfs_rtfree_blocks(struct xfs_trans *tp, xfs_fsblock_t rtbno,
	xfs_filblks_t rtlen);

	xfs_filblks_t xfs_rtbitmap_blockcount(struct xfs_mount *mp, xfs_rtbxlen_t
	rtextents);
	unsigned long long xfs_rtbitmap_wordcount(struct xfs_mount *mp,
	xfs_rtbxlen_t rtextents);

	xfs_filblks_t xfs_rtsummary_blockcount(struct xfs_mount *mp,
	unsigned int rsumlevels, xfs_extlen_t rbmblocks);
	unsigned long long xfs_rtsummary_wordcount(struct xfs_mount *mp,
	unsigned int rsumlevels, xfs_extlen_t rbmblocks);

	void xfs_rtbitmap_lock(struct xfs_trans tp, struct xfs_mount mp);
	void xfs_rtbitmap_unlock(struct xfs_mount *mp);

	/* Lock the rt bitmap inode in shared mode */
	#define XFS_RBMLOCK_BITMAP (1U << 0)
	/* Lock the rt summary inode in shared mode */
	#define XFS_RBMLOCK_SUMMARY (1U << 1)

	void xfs_rtbitmap_lock_shared(struct xfs_mount *mp,
	unsigned int rbmlock_flags);
	void xfs_rtbitmap_unlock_shared(struct xfs_mount *mp,
	unsigned int rbmlock_flags);
	#else /* CONFIG_XFS_RT */
	# define xfs_rtfree_extent(t,b,l) (-ENOSYS)
	# define xfs_rtfree_blocks(t,rb,rl) (-ENOSYS)
	# define xfs_rtalloc_query_range(m,t,l,h,f,p) (-ENOSYS)
	# define xfs_rtalloc_query_all(m,t,f,p) (-ENOSYS)
	# define xfs_rtbitmap_read_buf(a,b) (-ENOSYS)
	# define xfs_rtsummary_read_buf(a,b) (-ENOSYS)
	# define xfs_rtbuf_cache_relse(a) (0)
	# define xfs_rtalloc_extent_is_free(m,t,s,l,i) (-ENOSYS)
	static inline xfs_filblks_t
	xfs_rtbitmap_blockcount(struct xfs_mount *mp, xfs_rtbxlen_t rtextents)
	{
	/* shut up gcc */
	return 0;
	}
	# define xfs_rtbitmap_wordcount(mp, r) (0)
	# define xfs_rtsummary_blockcount(mp, l, b) (0)
	# define xfs_rtsummary_wordcount(mp, l, b) (0)
	# define xfs_rtbitmap_lock(tp, mp) do { } while (0)
	# define xfs_rtbitmap_unlock(mp) do { } while (0)
	# define xfs_rtbitmap_lock_shared(mp, lf) do { } while (0)
	# define xfs_rtbitmap_unlock_shared(mp, lf) do { } while (0)
	#endif /* CONFIG_XFS_RT */

	#endif /* __XFS_RTBITMAP_H__ */