fs/xfs/libxfs/xfs_bmap.h - linux - Git at Google

 /* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Copyright (c) 2000-2006 Silicon Graphics, Inc.
  * All Rights Reserved.
  */
 #ifndef __XFS_BMAP_H__
 #define	__XFS_BMAP_H__

 struct getbmap;
 struct xfs_bmbt_irec;
 struct xfs_ifork;
 struct xfs_inode;
 struct xfs_mount;
 struct xfs_trans;

 /*
  * Argument structure for xfs_bmap_alloc.
  */
 struct xfs_bmalloca {
 	struct xfs_trans	*tp;	/* transaction pointer */
 	struct xfs_inode	*ip;	/* incore inode pointer */
 	struct xfs_bmbt_irec	prev;	/* extent before the new one */
 	struct xfs_bmbt_irec	got;	/* extent after, or delayed */

 	xfs_fileoff_t		offset;	/* offset in file filling in */
 	xfs_extlen_t		length;	/* i/o length asked/allocated */
 	xfs_fsblock_t		blkno;	/* starting block of new extent */

 	struct xfs_btree_cur	*cur;	/* btree cursor */
 	struct xfs_iext_cursor	icur;	/* incore extent cursor */
 	int			nallocs;/* number of extents alloc'd */
 	int			logflags;/* flags for transaction logging */

 	xfs_extlen_t		total;	/* total blocks needed for xaction */
 	xfs_extlen_t		minlen;	/* minimum allocation size (blocks) */
 	xfs_extlen_t		minleft; /* amount must be left after alloc */
 	bool			eof;	/* set if allocating past last extent */
 	bool			wasdel;	/* replacing a delayed allocation */
 	bool			aeof;	/* allocated space at eof */
 	bool			conv;	/* overwriting unwritten extents */
 	int			datatype;/* data type being allocated */
 	uint32_t		flags;
 };

 #define	XFS_BMAP_MAX_NMAP	4

 /*
  * Flags for xfs_bmapi_*
  */
 #define XFS_BMAPI_ENTIRE	(1u << 0) /* return entire extent untrimmed */
 #define XFS_BMAPI_METADATA	(1u << 1) /* mapping metadata not user data */
 #define XFS_BMAPI_ATTRFORK	(1u << 2) /* use attribute fork not data */
 #define XFS_BMAPI_PREALLOC	(1u << 3) /* preallocating unwritten space */
 #define XFS_BMAPI_CONTIG	(1u << 4) /* must allocate only one extent */
 /*
  * unwritten extent conversion - this needs write cache flushing and no additional
  * allocation alignments. When specified with XFS_BMAPI_PREALLOC it converts
  * from written to unwritten, otherwise convert from unwritten to written.
  */
 #define XFS_BMAPI_CONVERT	(1u << 5)

 /*
  * allocate zeroed extents - this requires all newly allocated user data extents
  * to be initialised to zero. It will be ignored if XFS_BMAPI_METADATA is set.
  * Use in conjunction with XFS_BMAPI_CONVERT to convert unwritten extents found
  * during the allocation range to zeroed written extents.
  */
 #define XFS_BMAPI_ZERO		(1u << 6)

 /*
  * Map the inode offset to the block given in ap->firstblock.  Primarily
  * used for reflink.  The range must be in a hole, and this flag cannot be
  * turned on with PREALLOC or CONVERT, and cannot be used on the attr fork.
  *
  * For bunmapi, this flag unmaps the range without adjusting quota, reducing
  * refcount, or freeing the blocks.
  */
 #define XFS_BMAPI_REMAP		(1u << 7)

 /* Map something in the CoW fork. */
 #define XFS_BMAPI_COWFORK	(1u << 8)

 /* Skip online discard of freed extents */
 #define XFS_BMAPI_NODISCARD	(1u << 9)

 /* Do not update the rmap btree.  Used for reconstructing bmbt from rmapbt. */
 #define XFS_BMAPI_NORMAP	(1u << 10)

 #define XFS_BMAPI_FLAGS \
 	{ XFS_BMAPI_ENTIRE,	"ENTIRE" }, \
 	{ XFS_BMAPI_METADATA,	"METADATA" }, \
 	{ XFS_BMAPI_ATTRFORK,	"ATTRFORK" }, \
 	{ XFS_BMAPI_PREALLOC,	"PREALLOC" }, \
 	{ XFS_BMAPI_CONTIG,	"CONTIG" }, \
 	{ XFS_BMAPI_CONVERT,	"CONVERT" }, \
 	{ XFS_BMAPI_ZERO,	"ZERO" }, \
 	{ XFS_BMAPI_REMAP,	"REMAP" }, \
 	{ XFS_BMAPI_COWFORK,	"COWFORK" }, \
 	{ XFS_BMAPI_NODISCARD,	"NODISCARD" }, \
 	{ XFS_BMAPI_NORMAP,	"NORMAP" }


 static inline int xfs_bmapi_aflag(int w)
 {
 	return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK :
 	       (w == XFS_COW_FORK ? XFS_BMAPI_COWFORK : 0));
 }

 static inline int xfs_bmapi_whichfork(uint32_t bmapi_flags)
 {
 	if (bmapi_flags & XFS_BMAPI_COWFORK)
 		return XFS_COW_FORK;
 	else if (bmapi_flags & XFS_BMAPI_ATTRFORK)
 		return XFS_ATTR_FORK;
 	return XFS_DATA_FORK;
 }

 /*
  * Special values for xfs_bmbt_irec_t br_startblock field.
  */
 #define	DELAYSTARTBLOCK		((xfs_fsblock_t)-1LL)
 #define	HOLESTARTBLOCK		((xfs_fsblock_t)-2LL)

 /*
  * Flags for xfs_bmap_add_extent*.
  */
 #define BMAP_LEFT_CONTIG	(1u << 0)
 #define BMAP_RIGHT_CONTIG	(1u << 1)
 #define BMAP_LEFT_FILLING	(1u << 2)
 #define BMAP_RIGHT_FILLING	(1u << 3)
 #define BMAP_LEFT_DELAY		(1u << 4)
 #define BMAP_RIGHT_DELAY	(1u << 5)
 #define BMAP_LEFT_VALID		(1u << 6)
 #define BMAP_RIGHT_VALID	(1u << 7)
 #define BMAP_ATTRFORK		(1u << 8)
 #define BMAP_COWFORK		(1u << 9)

 #define XFS_BMAP_EXT_FLAGS \
 	{ BMAP_LEFT_CONTIG,	"LC" }, \
 	{ BMAP_RIGHT_CONTIG,	"RC" }, \
 	{ BMAP_LEFT_FILLING,	"LF" }, \
 	{ BMAP_RIGHT_FILLING,	"RF" }, \
 	{ BMAP_ATTRFORK,	"ATTR" }, \
 	{ BMAP_COWFORK,		"COW" }

 /* Return true if the extent is an allocated extent, written or not. */
 static inline bool xfs_bmap_is_real_extent(struct xfs_bmbt_irec *irec)
 {
 	return irec->br_startblock != HOLESTARTBLOCK &&
 		irec->br_startblock != DELAYSTARTBLOCK &&
 		!isnullstartblock(irec->br_startblock);
 }

 /*
  * Return true if the extent is a real, allocated extent, or false if it is  a
  * delayed allocation, and unwritten extent or a hole.
  */
 static inline bool xfs_bmap_is_written_extent(struct xfs_bmbt_irec *irec)
 {
 	return xfs_bmap_is_real_extent(irec) &&
 	       irec->br_state != XFS_EXT_UNWRITTEN;
 }

 /*
  * Check the mapping for obviously garbage allocations that could trash the
  * filesystem immediately.
  */
 #define xfs_valid_startblock(ip, startblock) \
 	((startblock) != 0 || XFS_IS_REALTIME_INODE(ip))

 void	xfs_trim_extent(struct xfs_bmbt_irec *irec, xfs_fileoff_t bno,
 		xfs_filblks_t len);
 unsigned int xfs_bmap_compute_attr_offset(struct xfs_mount *mp);
 int	xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd);
 void	xfs_bmap_local_to_extents_empty(struct xfs_trans *tp,
 		struct xfs_inode *ip, int whichfork);
 void	xfs_bmap_compute_maxlevels(struct xfs_mount *mp, int whichfork);
 int	xfs_bmap_first_unused(struct xfs_trans *tp, struct xfs_inode *ip,
 		xfs_extlen_t len, xfs_fileoff_t *unused, int whichfork);
 int	xfs_bmap_last_before(struct xfs_trans *tp, struct xfs_inode *ip,
 		xfs_fileoff_t *last_block, int whichfork);
 int	xfs_bmap_last_offset(struct xfs_inode *ip, xfs_fileoff_t *unused,
 		int whichfork);
 int	xfs_bmapi_read(struct xfs_inode *ip, xfs_fileoff_t bno,
 		xfs_filblks_t len, struct xfs_bmbt_irec *mval,
 		int *nmap, uint32_t flags);
 int	xfs_bmapi_write(struct xfs_trans *tp, struct xfs_inode *ip,
 		xfs_fileoff_t bno, xfs_filblks_t len, uint32_t flags,
 		xfs_extlen_t total, struct xfs_bmbt_irec *mval, int *nmap);
 int	__xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip,
 		xfs_fileoff_t bno, xfs_filblks_t *rlen, uint32_t flags,
 		xfs_extnum_t nexts);
 int	xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip,
 		xfs_fileoff_t bno, xfs_filblks_t len, uint32_t flags,
 		xfs_extnum_t nexts, int *done);
 int	xfs_bmap_del_extent_delay(struct xfs_inode *ip, int whichfork,
 		struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *got,
 		struct xfs_bmbt_irec *del);
 void	xfs_bmap_del_extent_cow(struct xfs_inode *ip,
 		struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *got,
 		struct xfs_bmbt_irec *del);
 uint	xfs_default_attroffset(struct xfs_inode *ip);
 int	xfs_bmap_collapse_extents(struct xfs_trans *tp, struct xfs_inode *ip,
 		xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb,
 		bool *done);
 int	xfs_bmap_can_insert_extents(struct xfs_inode *ip, xfs_fileoff_t off,
 		xfs_fileoff_t shift);
 int	xfs_bmap_insert_extents(struct xfs_trans *tp, struct xfs_inode *ip,
 		xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb,
 		bool *done, xfs_fileoff_t stop_fsb);
 int	xfs_bmap_split_extent(struct xfs_trans *tp, struct xfs_inode *ip,
 		xfs_fileoff_t split_offset);
 int	xfs_bmapi_reserve_delalloc(struct xfs_inode *ip, int whichfork,
 		xfs_fileoff_t off, xfs_filblks_t len, xfs_filblks_t prealloc,
 		struct xfs_bmbt_irec *got, struct xfs_iext_cursor *cur,
 		int eof);
 int	xfs_bmapi_convert_delalloc(struct xfs_inode *ip, int whichfork,
 		xfs_off_t offset, struct iomap *iomap, unsigned int *seq);
 int	xfs_bmap_add_extent_unwritten_real(struct xfs_trans *tp,
 		struct xfs_inode *ip, int whichfork,
 		struct xfs_iext_cursor *icur, struct xfs_btree_cur **curp,
 		struct xfs_bmbt_irec *new, int *logflagsp);

 enum xfs_bmap_intent_type {
 	XFS_BMAP_MAP = 1,
 	XFS_BMAP_UNMAP,
 };

 struct xfs_bmap_intent {
 	struct list_head			bi_list;
 	enum xfs_bmap_intent_type		bi_type;
 	int					bi_whichfork;
 	struct xfs_inode			*bi_owner;
 	struct xfs_bmbt_irec			bi_bmap;
 };

 int	xfs_bmap_finish_one(struct xfs_trans *tp, struct xfs_inode *ip,
 		enum xfs_bmap_intent_type type, int whichfork,
 		xfs_fileoff_t startoff, xfs_fsblock_t startblock,
 		xfs_filblks_t *blockcount, xfs_exntst_t state);
 void	xfs_bmap_map_extent(struct xfs_trans *tp, struct xfs_inode *ip,
 		struct xfs_bmbt_irec *imap);
 void	xfs_bmap_unmap_extent(struct xfs_trans *tp, struct xfs_inode *ip,
 		struct xfs_bmbt_irec *imap);

 static inline uint32_t xfs_bmap_fork_to_state(int whichfork)
 {
 	switch (whichfork) {
 	case XFS_ATTR_FORK:
 		return BMAP_ATTRFORK;
 	case XFS_COW_FORK:
 		return BMAP_COWFORK;
 	default:
 		return 0;
 	}
 }

 xfs_failaddr_t xfs_bmap_validate_extent(struct xfs_inode *ip, int whichfork,
 		struct xfs_bmbt_irec *irec);

 int	xfs_bmapi_remap(struct xfs_trans *tp, struct xfs_inode *ip,
 		xfs_fileoff_t bno, xfs_filblks_t len, xfs_fsblock_t startblock,
 		uint32_t flags);

 extern struct kmem_cache	*xfs_bmap_intent_cache;

 int __init xfs_bmap_intent_init_cache(void);
 void xfs_bmap_intent_destroy_cache(void);

 #endif	/* __XFS_BMAP_H__ */
	/* SPDX-License-Identifier: GPL-2.0 */
	/*
	* Copyright (c) 2000-2006 Silicon Graphics, Inc.
	* All Rights Reserved.
	*/
	#ifndef __XFS_BMAP_H__
	#define __XFS_BMAP_H__

	struct getbmap;
	struct xfs_bmbt_irec;
	struct xfs_ifork;
	struct xfs_inode;
	struct xfs_mount;
	struct xfs_trans;

	/*
	* Argument structure for xfs_bmap_alloc.
	*/
	struct xfs_bmalloca {
	struct xfs_trans tp; / transaction pointer */
	struct xfs_inode ip; / incore inode pointer */
	struct xfs_bmbt_irec prev; /* extent before the new one */
	struct xfs_bmbt_irec got; /* extent after, or delayed */

	xfs_fileoff_t offset; /* offset in file filling in */
	xfs_extlen_t length; /* i/o length asked/allocated */
	xfs_fsblock_t blkno; /* starting block of new extent */

	struct xfs_btree_cur cur; / btree cursor */
	struct xfs_iext_cursor icur; /* incore extent cursor */
	int nallocs;/* number of extents alloc'd */
	int logflags;/* flags for transaction logging */

	xfs_extlen_t total; /* total blocks needed for xaction */
	xfs_extlen_t minlen; /* minimum allocation size (blocks) */
	xfs_extlen_t minleft; /* amount must be left after alloc */
	bool eof; /* set if allocating past last extent */
	bool wasdel; /* replacing a delayed allocation */
	bool aeof; /* allocated space at eof */
	bool conv; /* overwriting unwritten extents */
	int datatype;/* data type being allocated */
	uint32_t flags;
	};

	#define XFS_BMAP_MAX_NMAP 4

	/*
	* Flags for xfs_bmapi_*
	*/
	#define XFS_BMAPI_ENTIRE (1u << 0) /* return entire extent untrimmed */
	#define XFS_BMAPI_METADATA (1u << 1) /* mapping metadata not user data */
	#define XFS_BMAPI_ATTRFORK (1u << 2) /* use attribute fork not data */
	#define XFS_BMAPI_PREALLOC (1u << 3) /* preallocating unwritten space */
	#define XFS_BMAPI_CONTIG (1u << 4) /* must allocate only one extent */
	/*
	* unwritten extent conversion - this needs write cache flushing and no additional
	* allocation alignments. When specified with XFS_BMAPI_PREALLOC it converts
	* from written to unwritten, otherwise convert from unwritten to written.
	*/
	#define XFS_BMAPI_CONVERT (1u << 5)

	/*
	* allocate zeroed extents - this requires all newly allocated user data extents
	* to be initialised to zero. It will be ignored if XFS_BMAPI_METADATA is set.
	* Use in conjunction with XFS_BMAPI_CONVERT to convert unwritten extents found
	* during the allocation range to zeroed written extents.
	*/
	#define XFS_BMAPI_ZERO (1u << 6)

	/*
	* Map the inode offset to the block given in ap->firstblock. Primarily
	* used for reflink. The range must be in a hole, and this flag cannot be
	* turned on with PREALLOC or CONVERT, and cannot be used on the attr fork.
	*
	* For bunmapi, this flag unmaps the range without adjusting quota, reducing
	* refcount, or freeing the blocks.
	*/
	#define XFS_BMAPI_REMAP (1u << 7)

	/* Map something in the CoW fork. */
	#define XFS_BMAPI_COWFORK (1u << 8)

	/* Skip online discard of freed extents */
	#define XFS_BMAPI_NODISCARD (1u << 9)

	/* Do not update the rmap btree. Used for reconstructing bmbt from rmapbt. */
	#define XFS_BMAPI_NORMAP (1u << 10)

	#define XFS_BMAPI_FLAGS \
	{ XFS_BMAPI_ENTIRE, "ENTIRE" }, \
	{ XFS_BMAPI_METADATA, "METADATA" }, \
	{ XFS_BMAPI_ATTRFORK, "ATTRFORK" }, \
	{ XFS_BMAPI_PREALLOC, "PREALLOC" }, \
	{ XFS_BMAPI_CONTIG, "CONTIG" }, \
	{ XFS_BMAPI_CONVERT, "CONVERT" }, \
	{ XFS_BMAPI_ZERO, "ZERO" }, \
	{ XFS_BMAPI_REMAP, "REMAP" }, \
	{ XFS_BMAPI_COWFORK, "COWFORK" }, \
	{ XFS_BMAPI_NODISCARD, "NODISCARD" }, \
	{ XFS_BMAPI_NORMAP, "NORMAP" }


	static inline int xfs_bmapi_aflag(int w)
	{
	return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK :
	(w == XFS_COW_FORK ? XFS_BMAPI_COWFORK : 0));
	}

	static inline int xfs_bmapi_whichfork(uint32_t bmapi_flags)
	{
	if (bmapi_flags & XFS_BMAPI_COWFORK)
	return XFS_COW_FORK;
	else if (bmapi_flags & XFS_BMAPI_ATTRFORK)
	return XFS_ATTR_FORK;
	return XFS_DATA_FORK;
	}

	/*
	* Special values for xfs_bmbt_irec_t br_startblock field.
	*/
	#define DELAYSTARTBLOCK ((xfs_fsblock_t)-1LL)
	#define HOLESTARTBLOCK ((xfs_fsblock_t)-2LL)

	/*
	* Flags for xfs_bmap_add_extent*.
	*/
	#define BMAP_LEFT_CONTIG (1u << 0)
	#define BMAP_RIGHT_CONTIG (1u << 1)
	#define BMAP_LEFT_FILLING (1u << 2)
	#define BMAP_RIGHT_FILLING (1u << 3)
	#define BMAP_LEFT_DELAY (1u << 4)
	#define BMAP_RIGHT_DELAY (1u << 5)
	#define BMAP_LEFT_VALID (1u << 6)
	#define BMAP_RIGHT_VALID (1u << 7)
	#define BMAP_ATTRFORK (1u << 8)
	#define BMAP_COWFORK (1u << 9)

	#define XFS_BMAP_EXT_FLAGS \
	{ BMAP_LEFT_CONTIG, "LC" }, \
	{ BMAP_RIGHT_CONTIG, "RC" }, \
	{ BMAP_LEFT_FILLING, "LF" }, \
	{ BMAP_RIGHT_FILLING, "RF" }, \
	{ BMAP_ATTRFORK, "ATTR" }, \
	{ BMAP_COWFORK, "COW" }

	/* Return true if the extent is an allocated extent, written or not. */
	static inline bool xfs_bmap_is_real_extent(struct xfs_bmbt_irec *irec)
	{
	return irec->br_startblock != HOLESTARTBLOCK &&
	irec->br_startblock != DELAYSTARTBLOCK &&
	!isnullstartblock(irec->br_startblock);
	}

	/*
	* Return true if the extent is a real, allocated extent, or false if it is a
	* delayed allocation, and unwritten extent or a hole.
	*/
	static inline bool xfs_bmap_is_written_extent(struct xfs_bmbt_irec *irec)
	{
	return xfs_bmap_is_real_extent(irec) &&
	irec->br_state != XFS_EXT_UNWRITTEN;
	}

	/*
	* Check the mapping for obviously garbage allocations that could trash the
	* filesystem immediately.
	*/
	#define xfs_valid_startblock(ip, startblock) \
	((startblock) != 0 \|\| XFS_IS_REALTIME_INODE(ip))

	void xfs_trim_extent(struct xfs_bmbt_irec *irec, xfs_fileoff_t bno,
	xfs_filblks_t len);
	unsigned int xfs_bmap_compute_attr_offset(struct xfs_mount *mp);
	int xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd);
	void xfs_bmap_local_to_extents_empty(struct xfs_trans *tp,
	struct xfs_inode *ip, int whichfork);
	void xfs_bmap_compute_maxlevels(struct xfs_mount *mp, int whichfork);
	int xfs_bmap_first_unused(struct xfs_trans tp, struct xfs_inode ip,
	xfs_extlen_t len, xfs_fileoff_t *unused, int whichfork);
	int xfs_bmap_last_before(struct xfs_trans tp, struct xfs_inode ip,
	xfs_fileoff_t *last_block, int whichfork);
	int xfs_bmap_last_offset(struct xfs_inode ip, xfs_fileoff_t unused,
	int whichfork);
	int xfs_bmapi_read(struct xfs_inode *ip, xfs_fileoff_t bno,
	xfs_filblks_t len, struct xfs_bmbt_irec *mval,
	int *nmap, uint32_t flags);
	int xfs_bmapi_write(struct xfs_trans tp, struct xfs_inode ip,
	xfs_fileoff_t bno, xfs_filblks_t len, uint32_t flags,
	xfs_extlen_t total, struct xfs_bmbt_irec mval, int nmap);
	int __xfs_bunmapi(struct xfs_trans tp, struct xfs_inode ip,
	xfs_fileoff_t bno, xfs_filblks_t *rlen, uint32_t flags,
	xfs_extnum_t nexts);
	int xfs_bunmapi(struct xfs_trans tp, struct xfs_inode ip,
	xfs_fileoff_t bno, xfs_filblks_t len, uint32_t flags,
	xfs_extnum_t nexts, int *done);
	int xfs_bmap_del_extent_delay(struct xfs_inode *ip, int whichfork,
	struct xfs_iext_cursor cur, struct xfs_bmbt_irec got,
	struct xfs_bmbt_irec *del);
	void xfs_bmap_del_extent_cow(struct xfs_inode *ip,
	struct xfs_iext_cursor cur, struct xfs_bmbt_irec got,
	struct xfs_bmbt_irec *del);
	uint xfs_default_attroffset(struct xfs_inode *ip);
	int xfs_bmap_collapse_extents(struct xfs_trans tp, struct xfs_inode ip,
	xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb,
	bool *done);
	int xfs_bmap_can_insert_extents(struct xfs_inode *ip, xfs_fileoff_t off,
	xfs_fileoff_t shift);
	int xfs_bmap_insert_extents(struct xfs_trans tp, struct xfs_inode ip,
	xfs_fileoff_t *next_fsb, xfs_fileoff_t offset_shift_fsb,
	bool *done, xfs_fileoff_t stop_fsb);
	int xfs_bmap_split_extent(struct xfs_trans tp, struct xfs_inode ip,
	xfs_fileoff_t split_offset);
	int xfs_bmapi_reserve_delalloc(struct xfs_inode *ip, int whichfork,
	xfs_fileoff_t off, xfs_filblks_t len, xfs_filblks_t prealloc,
	struct xfs_bmbt_irec got, struct xfs_iext_cursor cur,
	int eof);
	int xfs_bmapi_convert_delalloc(struct xfs_inode *ip, int whichfork,
	xfs_off_t offset, struct iomap iomap, unsigned int seq);
	int xfs_bmap_add_extent_unwritten_real(struct xfs_trans *tp,
	struct xfs_inode *ip, int whichfork,
	struct xfs_iext_cursor icur, struct xfs_btree_cur *curp,
	struct xfs_bmbt_irec new, int logflagsp);

	enum xfs_bmap_intent_type {
	XFS_BMAP_MAP = 1,
	XFS_BMAP_UNMAP,
	};

	struct xfs_bmap_intent {
	struct list_head bi_list;
	enum xfs_bmap_intent_type bi_type;
	int bi_whichfork;
	struct xfs_inode *bi_owner;
	struct xfs_bmbt_irec bi_bmap;
	};

	int xfs_bmap_finish_one(struct xfs_trans tp, struct xfs_inode ip,
	enum xfs_bmap_intent_type type, int whichfork,
	xfs_fileoff_t startoff, xfs_fsblock_t startblock,
	xfs_filblks_t *blockcount, xfs_exntst_t state);
	void xfs_bmap_map_extent(struct xfs_trans tp, struct xfs_inode ip,
	struct xfs_bmbt_irec *imap);
	void xfs_bmap_unmap_extent(struct xfs_trans tp, struct xfs_inode ip,
	struct xfs_bmbt_irec *imap);

	static inline uint32_t xfs_bmap_fork_to_state(int whichfork)
	{
	switch (whichfork) {
	case XFS_ATTR_FORK:
	return BMAP_ATTRFORK;
	case XFS_COW_FORK:
	return BMAP_COWFORK;
	default:
	return 0;
	}
	}

	xfs_failaddr_t xfs_bmap_validate_extent(struct xfs_inode *ip, int whichfork,
	struct xfs_bmbt_irec *irec);

	int xfs_bmapi_remap(struct xfs_trans tp, struct xfs_inode ip,
	xfs_fileoff_t bno, xfs_filblks_t len, xfs_fsblock_t startblock,
	uint32_t flags);

	extern struct kmem_cache *xfs_bmap_intent_cache;

	int __init xfs_bmap_intent_init_cache(void);
	void xfs_bmap_intent_destroy_cache(void);

	#endif /* __XFS_BMAP_H__ */