[linux-2.6-block.git] / fs / xfs / xfs_bmap_util.h

/*
 * Copyright (c) 2000-2006 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_BMAP_UTIL_H__
#define	__XFS_BMAP_UTIL_H__

/* Kernel only BMAP related definitions and functions */

struct xfs_bmbt_irec;
struct xfs_bmap_free_item;
struct xfs_ifork;
struct xfs_inode;
struct xfs_mount;
struct xfs_trans;

/*
 * Argument structure for xfs_bmap_alloc.
 */
struct xfs_bmalloca {
	xfs_fsblock_t		*firstblock; /* i/o first block allocated */
	struct xfs_bmap_free	*flist;	/* bmap freelist */
	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 */
	xfs_extnum_t		idx;	/* current extent index */
	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			userdata;/* set if is user data */
	bool			aeof;	/* allocated space at eof */
	bool			conv;	/* overwriting unwritten extents */
	int			flags;
	struct completion	*done;
	struct work_struct	work;
	int			result;
};

int	xfs_bmap_finish(struct xfs_trans **tp, struct xfs_bmap_free *flist,
			int *committed);
int	xfs_bmap_rtalloc(struct xfs_bmalloca *ap);
int	xfs_bmap_eof(struct xfs_inode *ip, xfs_fileoff_t endoff,
		     int whichfork, int *eof);
int	xfs_bmap_count_blocks(struct xfs_trans *tp, struct xfs_inode *ip,
			      int whichfork, int *count);
int	xfs_bmap_punch_delalloc_range(struct xfs_inode *ip,
		xfs_fileoff_t start_fsb, xfs_fileoff_t length);

/* bmap to userspace formatter - copy to user & advance pointer */
typedef int (*xfs_bmap_format_t)(void **, struct getbmapx *, int *);
int	xfs_getbmap(struct xfs_inode *ip, struct getbmapx *bmv,
		xfs_bmap_format_t formatter, void *arg);

/* functions in xfs_bmap.c that are only needed by xfs_bmap_util.c */
void	xfs_bmap_del_free(struct xfs_bmap_free *flist,
			  struct xfs_bmap_free_item *prev,
			  struct xfs_bmap_free_item *free);
int	xfs_bmap_extsize_align(struct xfs_mount *mp, struct xfs_bmbt_irec *gotp,
			       struct xfs_bmbt_irec *prevp, xfs_extlen_t extsz,
			       int rt, int eof, int delay, int convert,
			       xfs_fileoff_t *offp, xfs_extlen_t *lenp);
void	xfs_bmap_adjacent(struct xfs_bmalloca *ap);
int	xfs_bmap_last_extent(struct xfs_trans *tp, struct xfs_inode *ip,
			     int whichfork, struct xfs_bmbt_irec *rec,
			     int *is_empty);

/* preallocation and hole punch interface */
int	xfs_alloc_file_space(struct xfs_inode *ip, xfs_off_t offset,
			     xfs_off_t len, int alloc_type);
int	xfs_free_file_space(struct xfs_inode *ip, xfs_off_t offset,
			    xfs_off_t len);
int	xfs_zero_file_space(struct xfs_inode *ip, xfs_off_t offset,
			    xfs_off_t len);
int	xfs_collapse_file_space(struct xfs_inode *, xfs_off_t offset,
				xfs_off_t len);

/* EOF block manipulation functions */
bool	xfs_can_free_eofblocks(struct xfs_inode *ip, bool force);
int	xfs_free_eofblocks(struct xfs_mount *mp, struct xfs_inode *ip,
			   bool need_iolock);

int	xfs_swap_extents(struct xfs_inode *ip, struct xfs_inode *tip,
			 struct xfs_swapext *sx);

xfs_daddr_t xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb);

#endif	/* __XFS_BMAP_UTIL_H__ */
Commit	Line	Data
68988114 DC	1	/*
	2	* Copyright (c) 2000-2006 Silicon Graphics, Inc.
	3	* All Rights Reserved.
	4	*
	5	* This program is free software; you can redistribute it and/or
	6	* modify it under the terms of the GNU General Public License as
	7	* published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it would be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write the Free Software Foundation,
	16	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	17	*/
	18	#ifndef __XFS_BMAP_UTIL_H__
	19	#define __XFS_BMAP_UTIL_H__
	20
	21	/* Kernel only BMAP related definitions and functions */
	22
	23	struct xfs_bmbt_irec;
c24b5dfa	24	struct xfs_bmap_free_item;
68988114 DC	25	struct xfs_ifork;
	26	struct xfs_inode;
	27	struct xfs_mount;
	28	struct xfs_trans;
	29
	30	/*
	31	* Argument structure for xfs_bmap_alloc.
	32	*/
	33	struct xfs_bmalloca {
	34	xfs_fsblock_t firstblock; / i/o first block allocated */
	35	struct xfs_bmap_free flist; / bmap freelist */
	36	struct xfs_trans tp; / transaction pointer */
	37	struct xfs_inode ip; / incore inode pointer */
	38	struct xfs_bmbt_irec prev; /* extent before the new one */
	39	struct xfs_bmbt_irec got; /* extent after, or delayed */
	40
	41	xfs_fileoff_t offset; /* offset in file filling in */
	42	xfs_extlen_t length; /* i/o length asked/allocated */
	43	xfs_fsblock_t blkno; /* starting block of new extent */
	44
	45	struct xfs_btree_cur cur; / btree cursor */
	46	xfs_extnum_t idx; /* current extent index */
	47	int nallocs;/* number of extents alloc'd */
	48	int logflags;/* flags for transaction logging */
	49
	50	xfs_extlen_t total; /* total blocks needed for xaction */
	51	xfs_extlen_t minlen; /* minimum allocation size (blocks) */
	52	xfs_extlen_t minleft; /* amount must be left after alloc */
cf11da9c DC	53	bool eof; /* set if allocating past last extent */
	54	bool wasdel; /* replacing a delayed allocation */
	55	bool userdata;/* set if is user data */
	56	bool aeof; /* allocated space at eof */
	57	bool conv; /* overwriting unwritten extents */
68988114 DC	58	int flags;
	59	struct completion *done;
	60	struct work_struct work;
	61	int result;
	62	};
	63
	64	int xfs_bmap_finish(struct xfs_trans *tp, struct xfs_bmap_free flist,
	65	int *committed);
	66	int xfs_bmap_rtalloc(struct xfs_bmalloca *ap);
68988114 DC	67	int xfs_bmap_eof(struct xfs_inode *ip, xfs_fileoff_t endoff,
	68	int whichfork, int *eof);
	69	int xfs_bmap_count_blocks(struct xfs_trans tp, struct xfs_inode ip,
	70	int whichfork, int *count);
	71	int xfs_bmap_punch_delalloc_range(struct xfs_inode *ip,
	72	xfs_fileoff_t start_fsb, xfs_fileoff_t length);
	73
	74	/* bmap to userspace formatter - copy to user & advance pointer */
	75	typedef int (xfs_bmap_format_t)(void , struct getbmapx , int *);
	76	int xfs_getbmap(struct xfs_inode ip, struct getbmapx bmv,
	77	xfs_bmap_format_t formatter, void *arg);
	78
	79	/* functions in xfs_bmap.c that are only needed by xfs_bmap_util.c */
	80	void xfs_bmap_del_free(struct xfs_bmap_free *flist,
	81	struct xfs_bmap_free_item *prev,
	82	struct xfs_bmap_free_item *free);
	83	int xfs_bmap_extsize_align(struct xfs_mount mp, struct xfs_bmbt_irec gotp,
	84	struct xfs_bmbt_irec *prevp, xfs_extlen_t extsz,
	85	int rt, int eof, int delay, int convert,
	86	xfs_fileoff_t offp, xfs_extlen_t lenp);
	87	void xfs_bmap_adjacent(struct xfs_bmalloca *ap);
	88	int xfs_bmap_last_extent(struct xfs_trans tp, struct xfs_inode ip,
	89	int whichfork, struct xfs_bmbt_irec *rec,
	90	int *is_empty);
	91
c24b5dfa	92	/* preallocation and hole punch interface */
83aee9e4 CH	93	int xfs_alloc_file_space(struct xfs_inode *ip, xfs_off_t offset,
	94	xfs_off_t len, int alloc_type);
	95	int xfs_free_file_space(struct xfs_inode *ip, xfs_off_t offset,
	96	xfs_off_t len);
865e9446 CH	97	int xfs_zero_file_space(struct xfs_inode *ip, xfs_off_t offset,
865e9446 CH	98	xfs_off_t len);
e1d8fb88 NJ	99	int xfs_collapse_file_space(struct xfs_inode *, xfs_off_t offset,
e1d8fb88 NJ	100	xfs_off_t len);
c24b5dfa DC	101
	102	/* EOF block manipulation functions */
	103	bool xfs_can_free_eofblocks(struct xfs_inode *ip, bool force);
	104	int xfs_free_eofblocks(struct xfs_mount mp, struct xfs_inode ip,
	105	bool need_iolock);
	106
a133d952 DC	107	int xfs_swap_extents(struct xfs_inode ip, struct xfs_inode tip,
	108	struct xfs_swapext *sx);
	109
68988114 DC	110	xfs_daddr_t xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb);
	111
	112	#endif /* __XFS_BMAP_UTIL_H__ */