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

/*
 * Copyright (c) 2000-2003,2005 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_RTALLOC_H__
#define	__XFS_RTALLOC_H__

/* kernel only definitions and functions */

struct xfs_mount;
struct xfs_trans;

#ifdef CONFIG_XFS_RT
/*
 * Function prototypes for exported functions.
 */

/*
 * Allocate an extent in the realtime subvolume, with the usual allocation
 * parameters.  The length units are all in realtime extents, as is the
 * result block number.
 */
int					/* error */
xfs_rtallocate_extent(
	struct xfs_trans	*tp,	/* transaction pointer */
	xfs_rtblock_t		bno,	/* starting block number to allocate */
	xfs_extlen_t		minlen,	/* minimum length to allocate */
	xfs_extlen_t		maxlen,	/* maximum length to allocate */
	xfs_extlen_t		*len,	/* out: actual length allocated */
	xfs_alloctype_t		type,	/* allocation type XFS_ALLOCTYPE... */
	int			wasdel,	/* was a delayed allocation extent */
	xfs_extlen_t		prod,	/* extent product factor */
	xfs_rtblock_t		*rtblock); /* out: start block allocated */

/*
 * 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_rtblock_t		bno,	/* starting block number to free */
	xfs_extlen_t		len);	/* length of extent freed */

/*
 * Initialize realtime fields in the mount structure.
 */
int					/* error */
xfs_rtmount_init(
	struct xfs_mount	*mp);	/* file system mount structure */
void
xfs_rtunmount_inodes(
	struct xfs_mount	*mp);

/*
 * Get the bitmap and summary inodes into the mount structure
 * at mount time.
 */
int					/* error */
xfs_rtmount_inodes(
	struct xfs_mount	*mp);	/* file system mount structure */

/*
 * Pick an extent for allocation at the start of a new realtime file.
 * Use the sequence number stored in the atime field of the bitmap inode.
 * Translate this to a fraction of the rtextents, and return the product
 * of rtextents and the fraction.
 * The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ...
 */
int					/* error */
xfs_rtpick_extent(
	struct xfs_mount	*mp,	/* file system mount point */
	struct xfs_trans	*tp,	/* transaction pointer */
	xfs_extlen_t		len,	/* allocation length (rtextents) */
	xfs_rtblock_t		*pick);	/* result rt extent */

/*
 * Grow the realtime area of the filesystem.
 */
int
xfs_growfs_rt(
	struct xfs_mount	*mp,	/* file system mount structure */
	xfs_growfs_rt_t		*in);	/* user supplied growfs struct */

/*
 * From xfs_rtbitmap.c
 */
int xfs_rtbuf_get(struct xfs_mount *mp, struct xfs_trans *tp,
		  xfs_rtblock_t block, int issum, struct xfs_buf **bpp);
int xfs_rtcheck_range(struct xfs_mount *mp, struct xfs_trans *tp,
		      xfs_rtblock_t start, xfs_extlen_t len, int val,
		      xfs_rtblock_t *new, int *stat);
int xfs_rtfind_back(struct xfs_mount *mp, struct xfs_trans *tp,
		    xfs_rtblock_t start, xfs_rtblock_t limit,
		    xfs_rtblock_t *rtblock);
int xfs_rtfind_forw(struct xfs_mount *mp, struct xfs_trans *tp,
		    xfs_rtblock_t start, xfs_rtblock_t limit,
		    xfs_rtblock_t *rtblock);
int xfs_rtmodify_range(struct xfs_mount *mp, struct xfs_trans *tp,
		       xfs_rtblock_t start, xfs_extlen_t len, int val);
int xfs_rtmodify_summary_int(struct xfs_mount *mp, struct xfs_trans *tp,
			     int log, xfs_rtblock_t bbno, int delta,
			     xfs_buf_t **rbpp, xfs_fsblock_t *rsb,
			     xfs_suminfo_t *sum);
int xfs_rtmodify_summary(struct xfs_mount *mp, struct xfs_trans *tp, int log,
			 xfs_rtblock_t bbno, int delta, xfs_buf_t **rbpp,
			 xfs_fsblock_t *rsb);
int xfs_rtfree_range(struct xfs_mount *mp, struct xfs_trans *tp,
		     xfs_rtblock_t start, xfs_extlen_t len,
		     struct xfs_buf **rbpp, xfs_fsblock_t *rsb);


#else
# define xfs_rtallocate_extent(t,b,min,max,l,a,f,p,rb)  (ENOSYS)
# define xfs_rtfree_extent(t,b,l)                       (ENOSYS)
# define xfs_rtpick_extent(m,t,l,rb)                    (ENOSYS)
# define xfs_growfs_rt(mp,in)                           (ENOSYS)
static inline int		/* error */
xfs_rtmount_init(
	xfs_mount_t	*mp)	/* file system mount structure */
{
	if (mp->m_sb.sb_rblocks == 0)
		return 0;

	xfs_warn(mp, "Not built with CONFIG_XFS_RT");
	return -ENOSYS;
}
# define xfs_rtmount_inodes(m)  (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS))
# define xfs_rtunmount_inodes(m)
#endif	/* CONFIG_XFS_RT */

#endif	/* __XFS_RTALLOC_H__ */
Commit	Line	Data
1da177e4	1	/*
7b718769 NS	2	* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
7b718769 NS	3	* All Rights Reserved.
1da177e4	4	*
7b718769 NS	5	* This program is free software; you can redistribute it and/or
7b718769 NS	6	* modify it under the terms of the GNU General Public License as
1da177e4 LT	7	* published by the Free Software Foundation.
1da177e4 LT	8	*
7b718769 NS	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.
1da177e4	13	*
7b718769 NS	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
1da177e4 LT	17	*/
	18	#ifndef __XFS_RTALLOC_H__
	19	#define __XFS_RTALLOC_H__
	20
c7298202 DC	21	/* kernel only definitions and functions */
c7298202 DC	22
1da177e4 LT	23	struct xfs_mount;
	24	struct xfs_trans;
	25
1da177e4 LT	26	#ifdef CONFIG_XFS_RT
	27	/*
	28	* Function prototypes for exported functions.
	29	*/
	30
	31	/*
	32	* Allocate an extent in the realtime subvolume, with the usual allocation
	33	* parameters. The length units are all in realtime extents, as is the
	34	* result block number.
	35	*/
	36	int /* error */
	37	xfs_rtallocate_extent(
	38	struct xfs_trans tp, / transaction pointer */
	39	xfs_rtblock_t bno, /* starting block number to allocate */
	40	xfs_extlen_t minlen, /* minimum length to allocate */
	41	xfs_extlen_t maxlen, /* maximum length to allocate */
	42	xfs_extlen_t len, / out: actual length allocated */
	43	xfs_alloctype_t type, /* allocation type XFS_ALLOCTYPE... */
	44	int wasdel, /* was a delayed allocation extent */
	45	xfs_extlen_t prod, /* extent product factor */
	46	xfs_rtblock_t rtblock); / out: start block allocated */
	47
	48	/*
	49	* Free an extent in the realtime subvolume. Length is expressed in
	50	* realtime extents, as is the block number.
	51	*/
	52	int /* error */
	53	xfs_rtfree_extent(
	54	struct xfs_trans tp, / transaction pointer */
	55	xfs_rtblock_t bno, /* starting block number to free */
	56	xfs_extlen_t len); /* length of extent freed */
	57
	58	/*
	59	* Initialize realtime fields in the mount structure.
	60	*/
	61	int /* error */
	62	xfs_rtmount_init(
	63	struct xfs_mount mp); / file system mount structure */
b93b6e43 CH	64	void
	65	xfs_rtunmount_inodes(
	66	struct xfs_mount *mp);
1da177e4 LT	67
	68	/*
	69	* Get the bitmap and summary inodes into the mount structure
	70	* at mount time.
	71	*/
	72	int /* error */
	73	xfs_rtmount_inodes(
	74	struct xfs_mount mp); / file system mount structure */
	75
	76	/*
	77	* Pick an extent for allocation at the start of a new realtime file.
	78	* Use the sequence number stored in the atime field of the bitmap inode.
	79	* Translate this to a fraction of the rtextents, and return the product
	80	* of rtextents and the fraction.
	81	* The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ...
	82	*/
	83	int /* error */
	84	xfs_rtpick_extent(
	85	struct xfs_mount mp, / file system mount point */
	86	struct xfs_trans tp, / transaction pointer */
	87	xfs_extlen_t len, /* allocation length (rtextents) */
	88	xfs_rtblock_t pick); / result rt extent */
	89
1da177e4 LT	90	/*
	91	* Grow the realtime area of the filesystem.
	92	*/
	93	int
	94	xfs_growfs_rt(
	95	struct xfs_mount mp, / file system mount structure */
	96	xfs_growfs_rt_t in); / user supplied growfs struct */
	97
c963c619 DC	98	/*
	99	* From xfs_rtbitmap.c
	100	*/
	101	int xfs_rtbuf_get(struct xfs_mount mp, struct xfs_trans tp,
	102	xfs_rtblock_t block, int issum, struct xfs_buf **bpp);
	103	int xfs_rtcheck_range(struct xfs_mount mp, struct xfs_trans tp,
	104	xfs_rtblock_t start, xfs_extlen_t len, int val,
	105	xfs_rtblock_t new, int stat);
	106	int xfs_rtfind_back(struct xfs_mount mp, struct xfs_trans tp,
	107	xfs_rtblock_t start, xfs_rtblock_t limit,
	108	xfs_rtblock_t *rtblock);
	109	int xfs_rtfind_forw(struct xfs_mount mp, struct xfs_trans tp,
	110	xfs_rtblock_t start, xfs_rtblock_t limit,
	111	xfs_rtblock_t *rtblock);
	112	int xfs_rtmodify_range(struct xfs_mount mp, struct xfs_trans tp,
	113	xfs_rtblock_t start, xfs_extlen_t len, int val);
afabfd30 ES	114	int xfs_rtmodify_summary_int(struct xfs_mount mp, struct xfs_trans tp,
	115	int log, xfs_rtblock_t bbno, int delta,
	116	xfs_buf_t *rbpp, xfs_fsblock_t rsb,
	117	xfs_suminfo_t *sum);
c963c619 DC	118	int xfs_rtmodify_summary(struct xfs_mount mp, struct xfs_trans tp, int log,
	119	xfs_rtblock_t bbno, int delta, xfs_buf_t **rbpp,
	120	xfs_fsblock_t *rsb);
	121	int xfs_rtfree_range(struct xfs_mount mp, struct xfs_trans tp,
	122	xfs_rtblock_t start, xfs_extlen_t len,
	123	struct xfs_buf *rbpp, xfs_fsblock_t rsb);
	124
	125
1da177e4 LT	126	#else
	127	# define xfs_rtallocate_extent(t,b,min,max,l,a,f,p,rb) (ENOSYS)
	128	# define xfs_rtfree_extent(t,b,l) (ENOSYS)
	129	# define xfs_rtpick_extent(m,t,l,rb) (ENOSYS)
	130	# define xfs_growfs_rt(mp,in) (ENOSYS)
32891b29 ES	131	static inline int /* error */
	132	xfs_rtmount_init(
	133	xfs_mount_t mp) / file system mount structure */
	134	{
	135	if (mp->m_sb.sb_rblocks == 0)
	136	return 0;
	137
0b932ccc	138	xfs_warn(mp, "Not built with CONFIG_XFS_RT");
2451337d	139	return -ENOSYS;
32891b29	140	}
1da177e4	141	# define xfs_rtmount_inodes(m) (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS))
b93b6e43	142	# define xfs_rtunmount_inodes(m)
1da177e4 LT	143	#endif /* CONFIG_XFS_RT */
1da177e4 LT	144
1da177e4	145	#endif /* __XFS_RTALLOC_H__ */