fs/xfs/xfs_rtalloc.h

   1 /*
   2  * Copyright (c) 2000-2003 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32 #ifndef __XFS_RTALLOC_H__
  33 #define __XFS_RTALLOC_H__
  34
  35 struct xfs_mount;
  36 struct xfs_trans;
  37
  38 #define XFS_IS_REALTIME_INODE(ip) ((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME)
  39
  40 /* Min and max rt extent sizes, specified in bytes */
  41 #define XFS_MAX_RTEXTSIZE       (1024 * 1024 * 1024)    /* 1GB */
  42 #define XFS_DFL_RTEXTSIZE       (64 * 1024)             /* 64KB */
  43 #define XFS_MIN_RTEXTSIZE       (4 * 1024)              /* 4KB */
  44
  45 /*
  46  * Constants for bit manipulations.
  47  */
  48 #define XFS_NBBYLOG     3               /* log2(NBBY) */
  49 #define XFS_WORDLOG     2               /* log2(sizeof(xfs_rtword_t)) */
  50 #define XFS_NBWORDLOG   (XFS_NBBYLOG + XFS_WORDLOG)
  51 #define XFS_NBWORD      (1 << XFS_NBWORDLOG)
  52 #define XFS_WORDMASK    ((1 << XFS_WORDLOG) - 1)
  53
  54 #define XFS_BLOCKSIZE(mp)       ((mp)->m_sb.sb_blocksize)
  55 #define XFS_BLOCKMASK(mp)       ((mp)->m_blockmask)
  56 #define XFS_BLOCKWSIZE(mp)      ((mp)->m_blockwsize)
  57 #define XFS_BLOCKWMASK(mp)      ((mp)->m_blockwmask)
  58
  59 /*
  60  * Summary and bit manipulation macros.
  61  */
  62 #define XFS_SUMOFFS(mp,ls,bb)   ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb)))
  63 #define XFS_SUMOFFSTOBLOCK(mp,s)        \
  64         (((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog)
  65 #define XFS_SUMPTR(mp,bp,so)    \
  66         ((xfs_suminfo_t *)((char *)XFS_BUF_PTR(bp) + \
  67                 (((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp))))
  68
  69 #define XFS_BITTOBLOCK(mp,bi)   ((bi) >> (mp)->m_blkbit_log)
  70 #define XFS_BLOCKTOBIT(mp,bb)   ((bb) << (mp)->m_blkbit_log)
  71 #define XFS_BITTOWORD(mp,bi)    \
  72         ((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp)))
  73
  74 #define XFS_RTMIN(a,b)  ((a) < (b) ? (a) : (b))
  75 #define XFS_RTMAX(a,b)  ((a) > (b) ? (a) : (b))
  76
  77 #define XFS_RTLOBIT(w)  xfs_lowbit32(w)
  78 #define XFS_RTHIBIT(w)  xfs_highbit32(w)
  79
  80 #if XFS_BIG_BLKNOS
  81 #define XFS_RTBLOCKLOG(b)       xfs_highbit64(b)
  82 #else
  83 #define XFS_RTBLOCKLOG(b)       xfs_highbit32(b)
  84 #endif
  85
  86
  87 #ifdef __KERNEL__
  88
  89 #ifdef CONFIG_XFS_RT
  90 /*
  91  * Function prototypes for exported functions.
  92  */
  93
  94 /*
  95  * Allocate an extent in the realtime subvolume, with the usual allocation
  96  * parameters.  The length units are all in realtime extents, as is the
  97  * result block number.
  98  */
  99 int                                     /* error */
 100 xfs_rtallocate_extent(
 101         struct xfs_trans        *tp,    /* transaction pointer */
 102         xfs_rtblock_t           bno,    /* starting block number to allocate */
 103         xfs_extlen_t            minlen, /* minimum length to allocate */
 104         xfs_extlen_t            maxlen, /* maximum length to allocate */
 105         xfs_extlen_t            *len,   /* out: actual length allocated */
 106         xfs_alloctype_t         type,   /* allocation type XFS_ALLOCTYPE... */
 107         int                     wasdel, /* was a delayed allocation extent */
 108         xfs_extlen_t            prod,   /* extent product factor */
 109         xfs_rtblock_t           *rtblock); /* out: start block allocated */
 110
 111 /*
 112  * Free an extent in the realtime subvolume.  Length is expressed in
 113  * realtime extents, as is the block number.
 114  */
 115 int                                     /* error */
 116 xfs_rtfree_extent(
 117         struct xfs_trans        *tp,    /* transaction pointer */
 118         xfs_rtblock_t           bno,    /* starting block number to free */
 119         xfs_extlen_t            len);   /* length of extent freed */
 120
 121 /*
 122  * Initialize realtime fields in the mount structure.
 123  */
 124 int                                     /* error */
 125 xfs_rtmount_init(
 126         struct xfs_mount        *mp);   /* file system mount structure */
 127
 128 /*
 129  * Get the bitmap and summary inodes into the mount structure
 130  * at mount time.
 131  */
 132 int                                     /* error */
 133 xfs_rtmount_inodes(
 134         struct xfs_mount        *mp);   /* file system mount structure */
 135
 136 /*
 137  * Pick an extent for allocation at the start of a new realtime file.
 138  * Use the sequence number stored in the atime field of the bitmap inode.
 139  * Translate this to a fraction of the rtextents, and return the product
 140  * of rtextents and the fraction.
 141  * The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ...
 142  */
 143 int                                     /* error */
 144 xfs_rtpick_extent(
 145         struct xfs_mount        *mp,    /* file system mount point */
 146         struct xfs_trans        *tp,    /* transaction pointer */
 147         xfs_extlen_t            len,    /* allocation length (rtextents) */
 148         xfs_rtblock_t           *pick); /* result rt extent */
 149
 150 /*
 151  * Debug code: print out the value of a range in the bitmap.
 152  */
 153 void
 154 xfs_rtprint_range(
 155         struct xfs_mount        *mp,    /* file system mount structure */
 156         struct xfs_trans        *tp,    /* transaction pointer */
 157         xfs_rtblock_t           start,  /* starting block to print */
 158         xfs_extlen_t            len);   /* length to print */
 159
 160 /*
 161  * Debug code: print the summary file.
 162  */
 163 void
 164 xfs_rtprint_summary(
 165         struct xfs_mount        *mp,    /* file system mount structure */
 166         struct xfs_trans        *tp);   /* transaction pointer */
 167
 168 /*
 169  * Grow the realtime area of the filesystem.
 170  */
 171 int
 172 xfs_growfs_rt(
 173         struct xfs_mount        *mp,    /* file system mount structure */
 174         xfs_growfs_rt_t         *in);   /* user supplied growfs struct */
 175
 176 #else
 177 # define xfs_rtallocate_extent(t,b,min,max,l,a,f,p,rb)  (ENOSYS)
 178 # define xfs_rtfree_extent(t,b,l)                       (ENOSYS)
 179 # define xfs_rtpick_extent(m,t,l,rb)                    (ENOSYS)
 180 # define xfs_growfs_rt(mp,in)                           (ENOSYS)
 181 # define xfs_rtmount_init(m)    (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS))
 182 # define xfs_rtmount_inodes(m)  (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS))
 183 #endif  /* CONFIG_XFS_RT */
 184
 185 #endif  /* __KERNEL__ */
 186
 187 #endif  /* __XFS_RTALLOC_H__ */