// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 */
#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_rtxnum_t		start,	/* starting rtext number to allocate */
	xfs_rtxlen_t		minlen,	/* minimum length to allocate */
	xfs_rtxlen_t		maxlen,	/* maximum length to allocate */
	xfs_rtxlen_t		*len,	/* out: actual length allocated */
	int			wasdel,	/* was a delayed allocation extent */
	xfs_rtxlen_t		prod,	/* extent product factor */
	xfs_rtxnum_t		*rtblock); /* out: start rtext allocated */


int xfs_rtmount_readsb(struct xfs_mount *mp);
void xfs_rtmount_freesb(struct xfs_mount *mp);

/*
 * 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);

int xfs_rtmount_dqattach(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 */

void xfs_rt_resv_free(struct xfs_mount *mp);
int xfs_rt_resv_init(struct xfs_mount *mp);

/*
 * 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_rtxlen_t		len,	/* allocation length (rtextents) */
	xfs_rtxnum_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 */

int xfs_rtalloc_reinit_frextents(struct xfs_mount *mp);
int xfs_rtfile_convert_unwritten(struct xfs_inode *ip, loff_t pos,
		uint64_t len);

int xfs_growfs_check_rtgeom(const struct xfs_mount *mp, xfs_rfsblock_t dblocks,
		xfs_rfsblock_t rblocks, xfs_agblock_t rextsize,
		xfs_rtblock_t rextents, xfs_extlen_t rbmblocks,
		uint8_t rextslog);

int xfs_rtalloc_find_freesp(struct xfs_trans *tp, xfs_rtxnum_t *rtx,
		xfs_rtxnum_t end_rtx, xfs_rtxlen_t *len_rtx);
#else
static inline int
xfs_rtallocate_extent(struct xfs_trans *tp, xfs_rtxnum_t start,
		xfs_rtxlen_t minlen, xfs_rtxlen_t maxlen, xfs_rtxlen_t *len,
		int wasdel, xfs_rtxlen_t prod, xfs_rtxnum_t *rtblock)
{
	return -ENOSYS;
}
# define xfs_rtpick_extent(m,t,l,rb)			(-ENOSYS)
# define xfs_growfs_rt(mp,in)				(-ENOSYS)
# define xfs_rtalloc_reinit_frextents(m)		(0)
# define xfs_rtmount_readsb(mp)				(0)
# define xfs_rtmount_freesb(mp)				((void)0)
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)
# define xfs_rtfile_convert_unwritten(ip, pos, len)	(0)
# define xfs_rt_resv_free(mp)				((void)0)
# define xfs_rt_resv_init(mp)				(0)
# define xfs_rtmount_dqattach(mp)			(0)
# define xfs_growfs_check_rtgeom(mp, d, r, rs, rx, rb, rl)	(0)
# define xfs_rtalloc_find_freesp(tp, rtx, end_rtx, len_rtx)	(-ENOSYS)
#endif	/* CONFIG_XFS_RT */

#endif	/* __XFS_RTALLOC_H__ */