LXR linux/fs/xfs/xfs

   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
  21/* kernel only definitions and functions */
  22
  23struct xfs_mount;
  24struct xfs_trans;
  25
  26struct xfs_rtalloc_rec {
  27        xfs_rtblock_t           ar_startblock;
  28        xfs_rtblock_t           ar_blockcount;
  29};
  30
  31typedef int (*xfs_rtalloc_query_range_fn)(
  32        struct xfs_trans        *tp,
  33        struct xfs_rtalloc_rec  *rec,
  34        void                    *priv);
  35
  36#ifdef CONFIG_XFS_RT
  37/*
  38 * Function prototypes for exported functions.
  39 */
  40
  41/*
  42 * Allocate an extent in the realtime subvolume, with the usual allocation
  43 * parameters.  The length units are all in realtime extents, as is the
  44 * result block number.
  45 */
  46int                                     /* error */
  47xfs_rtallocate_extent(
  48        struct xfs_trans        *tp,    /* transaction pointer */
  49        xfs_rtblock_t           bno,    /* starting block number to allocate */
  50        xfs_extlen_t            minlen, /* minimum length to allocate */
  51        xfs_extlen_t            maxlen, /* maximum length to allocate */
  52        xfs_extlen_t            *len,   /* out: actual length allocated */
  53        int                     wasdel, /* was a delayed allocation extent */
  54        xfs_extlen_t            prod,   /* extent product factor */
  55        xfs_rtblock_t           *rtblock); /* out: start block allocated */
  56
  57/*
  58 * Free an extent in the realtime subvolume.  Length is expressed in
  59 * realtime extents, as is the block number.
  60 */
  61int                                     /* error */
  62xfs_rtfree_extent(
  63        struct xfs_trans        *tp,    /* transaction pointer */
  64        xfs_rtblock_t           bno,    /* starting block number to free */
  65        xfs_extlen_t            len);   /* length of extent freed */
  66
  67/*
  68 * Initialize realtime fields in the mount structure.
  69 */
  70int                                     /* error */
  71xfs_rtmount_init(
  72        struct xfs_mount        *mp);   /* file system mount structure */
  73void
  74xfs_rtunmount_inodes(
  75        struct xfs_mount        *mp);
  76
  77/*
  78 * Get the bitmap and summary inodes into the mount structure
  79 * at mount time.
  80 */
  81int                                     /* error */
  82xfs_rtmount_inodes(
  83        struct xfs_mount        *mp);   /* file system mount structure */
  84
  85/*
  86 * Pick an extent for allocation at the start of a new realtime file.
  87 * Use the sequence number stored in the atime field of the bitmap inode.
  88 * Translate this to a fraction of the rtextents, and return the product
  89 * of rtextents and the fraction.
  90 * The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ...
  91 */
  92int                                     /* error */
  93xfs_rtpick_extent(
  94        struct xfs_mount        *mp,    /* file system mount point */
  95        struct xfs_trans        *tp,    /* transaction pointer */
  96        xfs_extlen_t            len,    /* allocation length (rtextents) */
  97        xfs_rtblock_t           *pick); /* result rt extent */
  98
  99/*
 100 * Grow the realtime area of the filesystem.
 101 */
 102int
 103xfs_growfs_rt(
 104        struct xfs_mount        *mp,    /* file system mount structure */
 105        xfs_growfs_rt_t         *in);   /* user supplied growfs struct */
 106
 107/*
 108 * From xfs_rtbitmap.c
 109 */
 110int xfs_rtbuf_get(struct xfs_mount *mp, struct xfs_trans *tp,
 111                  xfs_rtblock_t block, int issum, struct xfs_buf **bpp);
 112int xfs_rtcheck_range(struct xfs_mount *mp, struct xfs_trans *tp,
 113                      xfs_rtblock_t start, xfs_extlen_t len, int val,
 114                      xfs_rtblock_t *new, int *stat);
 115int xfs_rtfind_back(struct xfs_mount *mp, struct xfs_trans *tp,
 116                    xfs_rtblock_t start, xfs_rtblock_t limit,
 117                    xfs_rtblock_t *rtblock);
 118int xfs_rtfind_forw(struct xfs_mount *mp, struct xfs_trans *tp,
 119                    xfs_rtblock_t start, xfs_rtblock_t limit,
 120                    xfs_rtblock_t *rtblock);
 121int xfs_rtmodify_range(struct xfs_mount *mp, struct xfs_trans *tp,
 122                       xfs_rtblock_t start, xfs_extlen_t len, int val);
 123int xfs_rtmodify_summary_int(struct xfs_mount *mp, struct xfs_trans *tp,
 124                             int log, xfs_rtblock_t bbno, int delta,
 125                             xfs_buf_t **rbpp, xfs_fsblock_t *rsb,
 126                             xfs_suminfo_t *sum);
 127int xfs_rtmodify_summary(struct xfs_mount *mp, struct xfs_trans *tp, int log,
 128                         xfs_rtblock_t bbno, int delta, xfs_buf_t **rbpp,
 129                         xfs_fsblock_t *rsb);
 130int xfs_rtfree_range(struct xfs_mount *mp, struct xfs_trans *tp,
 131                     xfs_rtblock_t start, xfs_extlen_t len,
 132                     struct xfs_buf **rbpp, xfs_fsblock_t *rsb);
 133int xfs_rtalloc_query_range(struct xfs_trans *tp,
 134                            struct xfs_rtalloc_rec *low_rec,
 135                            struct xfs_rtalloc_rec *high_rec,
 136                            xfs_rtalloc_query_range_fn fn,
 137                            void *priv);
 138int xfs_rtalloc_query_all(struct xfs_trans *tp,
 139                          xfs_rtalloc_query_range_fn fn,
 140                          void *priv);
 141#else
 142# define xfs_rtallocate_extent(t,b,min,max,l,f,p,rb)    (ENOSYS)
 143# define xfs_rtfree_extent(t,b,l)                       (ENOSYS)
 144# define xfs_rtpick_extent(m,t,l,rb)                    (ENOSYS)
 145# define xfs_growfs_rt(mp,in)                           (ENOSYS)
 146# define xfs_rtalloc_query_range(t,l,h,f,p)             (ENOSYS)
 147# define xfs_rtalloc_query_all(t,f,p)                   (ENOSYS)
 148# define xfs_rtbuf_get(m,t,b,i,p)                       (ENOSYS)
 149static inline int               /* error */
 150xfs_rtmount_init(
 151        xfs_mount_t     *mp)    /* file system mount structure */
 152{
 153        if (mp->m_sb.sb_rblocks == 0)
 154                return 0;
 155
 156        xfs_warn(mp, "Not built with CONFIG_XFS_RT");
 157        return -ENOSYS;
 158}
 159# define xfs_rtmount_inodes(m)  (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS))
 160# define xfs_rtunmount_inodes(m)
 161#endif  /* CONFIG_XFS_RT */
 162
 163#endif  /* __XFS_RTALLOC_H__ */
 164