LXR linux/fs/xfs/xfs_bmap

   1/*
   2 * Copyright (c) 2000-2006 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_BMAP_UTIL_H__
  19#define __XFS_BMAP_UTIL_H__
  20
  21/* Kernel only BMAP related definitions and functions */
  22
  23struct xfs_bmbt_irec;
  24struct xfs_bmap_free_item;
  25struct xfs_ifork;
  26struct xfs_inode;
  27struct xfs_mount;
  28struct xfs_trans;
  29
  30/*
  31 * Argument structure for xfs_bmap_alloc.
  32 */
  33struct xfs_bmalloca {
  34        xfs_fsblock_t           *firstblock; /* i/o first block allocated */
  35        struct xfs_bmap_free    *flist; /* bmap freelist */
  36        struct xfs_trans        *tp;    /* transaction pointer */
  37        struct xfs_inode        *ip;    /* incore inode pointer */
  38        struct xfs_bmbt_irec    prev;   /* extent before the new one */
  39        struct xfs_bmbt_irec    got;    /* extent after, or delayed */
  40
  41        xfs_fileoff_t           offset; /* offset in file filling in */
  42        xfs_extlen_t            length; /* i/o length asked/allocated */
  43        xfs_fsblock_t           blkno;  /* starting block of new extent */
  44
  45        struct xfs_btree_cur    *cur;   /* btree cursor */
  46        xfs_extnum_t            idx;    /* current extent index */
  47        int                     nallocs;/* number of extents alloc'd */
  48        int                     logflags;/* flags for transaction logging */
  49
  50        xfs_extlen_t            total;  /* total blocks needed for xaction */
  51        xfs_extlen_t            minlen; /* minimum allocation size (blocks) */
  52        xfs_extlen_t            minleft; /* amount must be left after alloc */
  53        char                    eof;    /* set if allocating past last extent */
  54        char                    wasdel; /* replacing a delayed allocation */
  55        char                    userdata;/* set if is user data */
  56        char                    aeof;   /* allocated space at eof */
  57        char                    conv;   /* overwriting unwritten extents */
  58        char                    stack_switch;
  59        int                     flags;
  60        struct completion       *done;
  61        struct work_struct      work;
  62        int                     result;
  63};
  64
  65int     xfs_bmap_finish(struct xfs_trans **tp, struct xfs_bmap_free *flist,
  66                        int *committed);
  67int     xfs_bmap_rtalloc(struct xfs_bmalloca *ap);
  68int     xfs_bmapi_allocate(struct xfs_bmalloca *args);
  69int     __xfs_bmapi_allocate(struct xfs_bmalloca *args);
  70int     xfs_bmap_eof(struct xfs_inode *ip, xfs_fileoff_t endoff,
  71                     int whichfork, int *eof);
  72int     xfs_bmap_count_blocks(struct xfs_trans *tp, struct xfs_inode *ip,
  73                              int whichfork, int *count);
  74int     xfs_bmap_punch_delalloc_range(struct xfs_inode *ip,
  75                xfs_fileoff_t start_fsb, xfs_fileoff_t length);
  76
  77/* bmap to userspace formatter - copy to user & advance pointer */
  78typedef int (*xfs_bmap_format_t)(void **, struct getbmapx *, int *);
  79int     xfs_getbmap(struct xfs_inode *ip, struct getbmapx *bmv,
  80                xfs_bmap_format_t formatter, void *arg);
  81
  82/* functions in xfs_bmap.c that are only needed by xfs_bmap_util.c */
  83void    xfs_bmap_del_free(struct xfs_bmap_free *flist,
  84                          struct xfs_bmap_free_item *prev,
  85                          struct xfs_bmap_free_item *free);
  86int     xfs_bmap_extsize_align(struct xfs_mount *mp, struct xfs_bmbt_irec *gotp,
  87                               struct xfs_bmbt_irec *prevp, xfs_extlen_t extsz,
  88                               int rt, int eof, int delay, int convert,
  89                               xfs_fileoff_t *offp, xfs_extlen_t *lenp);
  90void    xfs_bmap_adjacent(struct xfs_bmalloca *ap);
  91int     xfs_bmap_last_extent(struct xfs_trans *tp, struct xfs_inode *ip,
  92                             int whichfork, struct xfs_bmbt_irec *rec,
  93                             int *is_empty);
  94
  95/* preallocation and hole punch interface */
  96int     xfs_alloc_file_space(struct xfs_inode *ip, xfs_off_t offset,
  97                             xfs_off_t len, int alloc_type);
  98int     xfs_free_file_space(struct xfs_inode *ip, xfs_off_t offset,
  99                            xfs_off_t len);
 100int     xfs_zero_file_space(struct xfs_inode *ip, xfs_off_t offset,
 101                            xfs_off_t len);
 102
 103/* EOF block manipulation functions */
 104bool    xfs_can_free_eofblocks(struct xfs_inode *ip, bool force);
 105int     xfs_free_eofblocks(struct xfs_mount *mp, struct xfs_inode *ip,
 106                           bool need_iolock);
 107
 108int     xfs_swap_extents(struct xfs_inode *ip, struct xfs_inode *tip,
 109                         struct xfs_swapext *sx);
 110
 111xfs_daddr_t xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb);
 112
 113#endif  /* __XFS_BMAP_UTIL_H__ */
 114