fs/xfs/xfs_rtalloc.h

   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
  23 struct xfs_mount;
  24 struct xfs_trans;
  25
  26 struct xfs_rtalloc_rec {
  27         xfs_rtblock_t           ar_startblock;
  28         xfs_rtblock_t           ar_blockcount;
  29 };
  30
  31 typedef 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  */
  46 int                                     /* error */
  47 xfs_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  */
  61 int                                     /* error */
  62 xfs_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  */
  70 int                                     /* error */
  71 xfs_rtmount_init(
  72         struct xfs_mount        *mp);   /* file system mount structure */
  73 void
  74 xfs_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  */
  81 int                                     /* error */
  82 xfs_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  */
  92 int                                     /* error */
  93 xfs_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  */
 102 int
 103 xfs_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  */
 110 int xfs_rtbuf_get(struct xfs_mount *mp, struct xfs_trans *tp,
 111                   xfs_rtblock_t block, int issum, struct xfs_buf **bpp);
 112 int 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);
 115 int 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);
 118 int 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);
 121 int xfs_rtmodify_range(struct xfs_mount *mp, struct xfs_trans *tp,
 122                        xfs_rtblock_t start, xfs_extlen_t len, int val);
 123 int 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);
 127 int 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);
 130 int 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);
 133 int 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);
 138 int 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)
 149 static inline int               /* error */
 150 xfs_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__ */