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/*
* Copyright (c) 2000 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;
/* 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_FILESYSTEMS
#define XFS_RTBLOCKLOG(b) xfs_highbit64(b)
#else
#define XFS_RTBLOCKLOG(b) xfs_highbit32(b)
#endif
/*
* 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 */
#ifdef XFSDEBUG
/*
* 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 */
#endif /* XFSDEBUG */
#endif /* __XFS_RTALLOC_H__ */
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