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 #ifdef CONFIG_XFS_RT
  27 /*
  28  * Function prototypes for exported functions.
  29  */
  30
  31 /*
  32  * Allocate an extent in the realtime subvolume, with the usual allocation
  33  * parameters.  The length units are all in realtime extents, as is the
  34  * result block number.
  35  */
  36 int                                     /* error */
  37 xfs_rtallocate_extent(
  38         struct xfs_trans        *tp,    /* transaction pointer */
  39         xfs_rtblock_t           bno,    /* starting block number to allocate */
  40         xfs_extlen_t            minlen, /* minimum length to allocate */
  41         xfs_extlen_t            maxlen, /* maximum length to allocate */
  42         xfs_extlen_t            *len,   /* out: actual length allocated */
  43         xfs_alloctype_t         type,   /* allocation type XFS_ALLOCTYPE... */
  44         int                     wasdel, /* was a delayed allocation extent */
  45         xfs_extlen_t            prod,   /* extent product factor */
  46         xfs_rtblock_t           *rtblock); /* out: start block allocated */
  47
  48 /*
  49  * Free an extent in the realtime subvolume.  Length is expressed in
  50  * realtime extents, as is the block number.
  51  */
  52 int                                     /* error */
  53 xfs_rtfree_extent(
  54         struct xfs_trans        *tp,    /* transaction pointer */
  55         xfs_rtblock_t           bno,    /* starting block number to free */
  56         xfs_extlen_t            len);   /* length of extent freed */
  57
  58 /*
  59  * Initialize realtime fields in the mount structure.
  60  */
  61 int                                     /* error */
  62 xfs_rtmount_init(
  63         struct xfs_mount        *mp);   /* file system mount structure */
  64 void
  65 xfs_rtunmount_inodes(
  66         struct xfs_mount        *mp);
  67
  68 /*
  69  * Get the bitmap and summary inodes into the mount structure
  70  * at mount time.
  71  */
  72 int                                     /* error */
  73 xfs_rtmount_inodes(
  74         struct xfs_mount        *mp);   /* file system mount structure */
  75
  76 /*
  77  * Pick an extent for allocation at the start of a new realtime file.
  78  * Use the sequence number stored in the atime field of the bitmap inode.
  79  * Translate this to a fraction of the rtextents, and return the product
  80  * of rtextents and the fraction.
  81  * The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ...
  82  */
  83 int                                     /* error */
  84 xfs_rtpick_extent(
  85         struct xfs_mount        *mp,    /* file system mount point */
  86         struct xfs_trans        *tp,    /* transaction pointer */
  87         xfs_extlen_t            len,    /* allocation length (rtextents) */
  88         xfs_rtblock_t           *pick); /* result rt extent */
  89
  90 /*
  91  * Grow the realtime area of the filesystem.
  92  */
  93 int
  94 xfs_growfs_rt(
  95         struct xfs_mount        *mp,    /* file system mount structure */
  96         xfs_growfs_rt_t         *in);   /* user supplied growfs struct */
  97
  98 #else
  99 # define xfs_rtallocate_extent(t,b,min,max,l,a,f,p,rb)  (ENOSYS)
 100 # define xfs_rtfree_extent(t,b,l)                       (ENOSYS)
 101 # define xfs_rtpick_extent(m,t,l,rb)                    (ENOSYS)
 102 # define xfs_growfs_rt(mp,in)                           (ENOSYS)
 103 static inline int               /* error */
 104 xfs_rtmount_init(
 105         xfs_mount_t     *mp)    /* file system mount structure */
 106 {
 107         if (mp->m_sb.sb_rblocks == 0)
 108                 return 0;
 109
 110         xfs_warn(mp, "Not built with CONFIG_XFS_RT");
 111         return ENOSYS;
 112 }
 113 # define xfs_rtmount_inodes(m)  (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS))
 114 # define xfs_rtunmount_inodes(m)
 115 #endif  /* CONFIG_XFS_RT */
 116
 117 #endif  /* __XFS_RTALLOC_H__ */