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
  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 */
  36int                                     /* error */
  37xfs_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 */
  52int                                     /* error */
  53xfs_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 */
  61int                                     /* error */
  62xfs_rtmount_init(
  63        struct xfs_mount        *mp);   /* file system mount structure */
  64void
  65xfs_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 */
  72int                                     /* error */
  73xfs_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 */
  83int                                     /* error */
  84xfs_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 */
  93int
  94xfs_growfs_rt(
  95        struct xfs_mount        *mp,    /* file system mount structure */
  96        xfs_growfs_rt_t         *in);   /* user supplied growfs struct */
  97
  98/*
  99 * From xfs_rtbitmap.c
 100 */
 101int xfs_rtbuf_get(struct xfs_mount *mp, struct xfs_trans *tp,
 102                  xfs_rtblock_t block, int issum, struct xfs_buf **bpp);
 103int xfs_rtcheck_range(struct xfs_mount *mp, struct xfs_trans *tp,
 104                      xfs_rtblock_t start, xfs_extlen_t len, int val,
 105                      xfs_rtblock_t *new, int *stat);
 106int xfs_rtfind_back(struct xfs_mount *mp, struct xfs_trans *tp,
 107                    xfs_rtblock_t start, xfs_rtblock_t limit,
 108                    xfs_rtblock_t *rtblock);
 109int xfs_rtfind_forw(struct xfs_mount *mp, struct xfs_trans *tp,
 110                    xfs_rtblock_t start, xfs_rtblock_t limit,
 111                    xfs_rtblock_t *rtblock);
 112int xfs_rtmodify_range(struct xfs_mount *mp, struct xfs_trans *tp,
 113                       xfs_rtblock_t start, xfs_extlen_t len, int val);
 114int xfs_rtmodify_summary(struct xfs_mount *mp, struct xfs_trans *tp, int log,
 115                         xfs_rtblock_t bbno, int delta, xfs_buf_t **rbpp,
 116                         xfs_fsblock_t *rsb);
 117int xfs_rtfree_range(struct xfs_mount *mp, struct xfs_trans *tp,
 118                     xfs_rtblock_t start, xfs_extlen_t len,
 119                     struct xfs_buf **rbpp, xfs_fsblock_t *rsb);
 120
 121
 122#else
 123# define xfs_rtallocate_extent(t,b,min,max,l,a,f,p,rb)  (ENOSYS)
 124# define xfs_rtfree_extent(t,b,l)                       (ENOSYS)
 125# define xfs_rtpick_extent(m,t,l,rb)                    (ENOSYS)
 126# define xfs_growfs_rt(mp,in)                           (ENOSYS)
 127static inline int               /* error */
 128xfs_rtmount_init(
 129        xfs_mount_t     *mp)    /* file system mount structure */
 130{
 131        if (mp->m_sb.sb_rblocks == 0)
 132                return 0;
 133
 134        xfs_warn(mp, "Not built with CONFIG_XFS_RT");
 135        return ENOSYS;
 136}
 137# define xfs_rtmount_inodes(m)  (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS))
 138# define xfs_rtunmount_inodes(m)
 139#endif  /* CONFIG_XFS_RT */
 140
 141#endif  /* __XFS_RTALLOC_H__ */
 142