linux/fs/xfs/xfs_rtalloc.h
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   1/*
   2 * Copyright (c) 2000-2003,2005 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_RTALLOC_H__
  19#define __XFS_RTALLOC_H__
  20
  21struct xfs_mount;
  22struct xfs_trans;
  23
  24/* Min and max rt extent sizes, specified in bytes */
  25#define XFS_MAX_RTEXTSIZE       (1024 * 1024 * 1024)    /* 1GB */
  26#define XFS_DFL_RTEXTSIZE       (64 * 1024)             /* 64kB */
  27#define XFS_MIN_RTEXTSIZE       (4 * 1024)              /* 4kB */
  28
  29/*
  30 * Constants for bit manipulations.
  31 */
  32#define XFS_NBBYLOG     3               /* log2(NBBY) */
  33#define XFS_WORDLOG     2               /* log2(sizeof(xfs_rtword_t)) */
  34#define XFS_NBWORDLOG   (XFS_NBBYLOG + XFS_WORDLOG)
  35#define XFS_NBWORD      (1 << XFS_NBWORDLOG)
  36#define XFS_WORDMASK    ((1 << XFS_WORDLOG) - 1)
  37
  38#define XFS_BLOCKSIZE(mp)       ((mp)->m_sb.sb_blocksize)
  39#define XFS_BLOCKMASK(mp)       ((mp)->m_blockmask)
  40#define XFS_BLOCKWSIZE(mp)      ((mp)->m_blockwsize)
  41#define XFS_BLOCKWMASK(mp)      ((mp)->m_blockwmask)
  42
  43/*
  44 * Summary and bit manipulation macros.
  45 */
  46#define XFS_SUMOFFS(mp,ls,bb)   ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb)))
  47#define XFS_SUMOFFSTOBLOCK(mp,s)        \
  48        (((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog)
  49#define XFS_SUMPTR(mp,bp,so)    \
  50        ((xfs_suminfo_t *)((bp)->b_addr + \
  51                (((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp))))
  52
  53#define XFS_BITTOBLOCK(mp,bi)   ((bi) >> (mp)->m_blkbit_log)
  54#define XFS_BLOCKTOBIT(mp,bb)   ((bb) << (mp)->m_blkbit_log)
  55#define XFS_BITTOWORD(mp,bi)    \
  56        ((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp)))
  57
  58#define XFS_RTMIN(a,b)  ((a) < (b) ? (a) : (b))
  59#define XFS_RTMAX(a,b)  ((a) > (b) ? (a) : (b))
  60
  61#define XFS_RTLOBIT(w)  xfs_lowbit32(w)
  62#define XFS_RTHIBIT(w)  xfs_highbit32(w)
  63
  64#if XFS_BIG_BLKNOS
  65#define XFS_RTBLOCKLOG(b)       xfs_highbit64(b)
  66#else
  67#define XFS_RTBLOCKLOG(b)       xfs_highbit32(b)
  68#endif
  69
  70
  71#ifdef __KERNEL__
  72
  73#ifdef CONFIG_XFS_RT
  74/*
  75 * Function prototypes for exported functions.
  76 */
  77
  78/*
  79 * Allocate an extent in the realtime subvolume, with the usual allocation
  80 * parameters.  The length units are all in realtime extents, as is the
  81 * result block number.
  82 */
  83int                                     /* error */
  84xfs_rtallocate_extent(
  85        struct xfs_trans        *tp,    /* transaction pointer */
  86        xfs_rtblock_t           bno,    /* starting block number to allocate */
  87        xfs_extlen_t            minlen, /* minimum length to allocate */
  88        xfs_extlen_t            maxlen, /* maximum length to allocate */
  89        xfs_extlen_t            *len,   /* out: actual length allocated */
  90        xfs_alloctype_t         type,   /* allocation type XFS_ALLOCTYPE... */
  91        int                     wasdel, /* was a delayed allocation extent */
  92        xfs_extlen_t            prod,   /* extent product factor */
  93        xfs_rtblock_t           *rtblock); /* out: start block allocated */
  94
  95/*
  96 * Free an extent in the realtime subvolume.  Length is expressed in
  97 * realtime extents, as is the block number.
  98 */
  99int                                     /* error */
 100xfs_rtfree_extent(
 101        struct xfs_trans        *tp,    /* transaction pointer */
 102        xfs_rtblock_t           bno,    /* starting block number to free */
 103        xfs_extlen_t            len);   /* length of extent freed */
 104
 105/*
 106 * Initialize realtime fields in the mount structure.
 107 */
 108int                                     /* error */
 109xfs_rtmount_init(
 110        struct xfs_mount        *mp);   /* file system mount structure */
 111void
 112xfs_rtunmount_inodes(
 113        struct xfs_mount        *mp);
 114
 115/*
 116 * Get the bitmap and summary inodes into the mount structure
 117 * at mount time.
 118 */
 119int                                     /* error */
 120xfs_rtmount_inodes(
 121        struct xfs_mount        *mp);   /* file system mount structure */
 122
 123/*
 124 * Pick an extent for allocation at the start of a new realtime file.
 125 * Use the sequence number stored in the atime field of the bitmap inode.
 126 * Translate this to a fraction of the rtextents, and return the product
 127 * of rtextents and the fraction.
 128 * The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ...
 129 */
 130int                                     /* error */
 131xfs_rtpick_extent(
 132        struct xfs_mount        *mp,    /* file system mount point */
 133        struct xfs_trans        *tp,    /* transaction pointer */
 134        xfs_extlen_t            len,    /* allocation length (rtextents) */
 135        xfs_rtblock_t           *pick); /* result rt extent */
 136
 137/*
 138 * Grow the realtime area of the filesystem.
 139 */
 140int
 141xfs_growfs_rt(
 142        struct xfs_mount        *mp,    /* file system mount structure */
 143        xfs_growfs_rt_t         *in);   /* user supplied growfs struct */
 144
 145#else
 146# define xfs_rtallocate_extent(t,b,min,max,l,a,f,p,rb)  (ENOSYS)
 147# define xfs_rtfree_extent(t,b,l)                       (ENOSYS)
 148# define xfs_rtpick_extent(m,t,l,rb)                    (ENOSYS)
 149# define xfs_growfs_rt(mp,in)                           (ENOSYS)
 150static inline int               /* error */
 151xfs_rtmount_init(
 152        xfs_mount_t     *mp)    /* file system mount structure */
 153{
 154        if (mp->m_sb.sb_rblocks == 0)
 155                return 0;
 156
 157        xfs_warn(mp, "Not built with CONFIG_XFS_RT");
 158        return ENOSYS;
 159}
 160# define xfs_rtmount_inodes(m)  (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS))
 161# define xfs_rtunmount_inodes(m)
 162#endif  /* CONFIG_XFS_RT */
 163
 164#endif  /* __KERNEL__ */
 165
 166#endif  /* __XFS_RTALLOC_H__ */
 167
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