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/*

 * Copyright (c) 2000-2003 Silicon Graphics, Inc.  All Rights Reserved.

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of version 2 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.

 *

 * Further, this software is distributed without any warranty that it is

 * free of the rightful claim of any third person regarding infringement

 * or the like.  Any license provided herein, whether implied or

 * otherwise, applies only to this software file.  Patent licenses, if

 * any, provided herein do not apply to combinations of this program with

 * other software, or any other product whatsoever.

 *

 * You should have received a copy of the GNU General Public License along

 * with this program; if not, write the Free Software Foundation, Inc., 59

 * Temple Place - Suite 330, Boston MA 02111-1307, USA.

 *

 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,

 * Mountain View, CA  94043, or:

 *

 * http://www.sgi.com

 *

 * For further information regarding this notice, see:

 *

 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/

 */

#ifndef __XFS_RTALLOC_H__

#define __XFS_RTALLOC_H__

struct xfs_mount;

struct xfs_trans;

#define XFS_IS_REALTIME_INODE(ip) ((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME)

/* Min and max rt extent sizes, specified in bytes */

#define XFS_MAX_RTEXTSIZE       (1024 * 1024 * 1024)    /* 1GB */

#define XFS_DFL_RTEXTSIZE       (64 * 1024)             /* 64KB */

#define XFS_MIN_RTEXTSIZE       (4 * 1024)              /* 4KB */

/*

 * Constants for bit manipulations.

 */

#define XFS_NBBYLOG     3               /* log2(NBBY) */

#define XFS_WORDLOG     2               /* log2(sizeof(xfs_rtword_t)) */

#define XFS_NBWORDLOG   (XFS_NBBYLOG + XFS_WORDLOG)

#define XFS_NBWORD      (1 << XFS_NBWORDLOG)

#define XFS_WORDMASK    ((1 << XFS_WORDLOG) - 1)

#define XFS_BLOCKSIZE(mp)       ((mp)->m_sb.sb_blocksize)

#define XFS_BLOCKMASK(mp)       ((mp)->m_blockmask)

#define XFS_BLOCKWSIZE(mp)      ((mp)->m_blockwsize)

#define XFS_BLOCKWMASK(mp)      ((mp)->m_blockwmask)

/*

 * Summary and bit manipulation macros.

 */

#define XFS_SUMOFFS(mp,ls,bb)   ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb)))

#define XFS_SUMOFFSTOBLOCK(mp,s)        \

        (((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog)

#define XFS_SUMPTR(mp,bp,so)    \

        ((xfs_suminfo_t *)((char *)XFS_BUF_PTR(bp) + \

                (((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp))))

#define XFS_BITTOBLOCK(mp,bi)   ((bi) >> (mp)->m_blkbit_log)

#define XFS_BLOCKTOBIT(mp,bb)   ((bb) << (mp)->m_blkbit_log)

#define XFS_BITTOWORD(mp,bi)    \

        ((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp)))

#define XFS_RTMIN(a,b)  ((a) < (b) ? (a) : (b))

#define XFS_RTMAX(a,b)  ((a) > (b) ? (a) : (b))

#define XFS_RTLOBIT(w)  xfs_lowbit32(w)

#define XFS_RTHIBIT(w)  xfs_highbit32(w)

#if XFS_BIG_BLKNOS

#define XFS_RTBLOCKLOG(b)       xfs_highbit64(b)

#else

#define XFS_RTBLOCKLOG(b)       xfs_highbit32(b)

#endif

#ifdef __KERNEL__

#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 */

/*

 * 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 */

/*

 * Debug code: print out the value of a range in the bitmap.

 */

void

xfs_rtprint_range(

        struct xfs_mount        *mp,    /* file system mount structure */

        struct xfs_trans        *tp,    /* transaction pointer */

        xfs_rtblock_t           start,  /* starting block to print */

        xfs_extlen_t            len);   /* length to print */

/*

 * Debug code: print the summary file.

 */

void

xfs_rtprint_summary(

        struct xfs_mount        *mp,    /* file system mount structure */

        struct xfs_trans        *tp);   /* transaction pointer */

/*

 * 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 */

#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)

# define xfs_rtmount_init(m)    (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS))

# define xfs_rtmount_inodes(m)  (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS))

#endif  /* CONFIG_XFS_RT */

#endif  /* __KERNEL__ */

#endif  /* __XFS_RTALLOC_H__ */