fs/xfs/xfs_bmap_util.h

   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
  23 struct xfs_bmbt_irec;
  24 struct xfs_bmap_free_item;
  25 struct xfs_ifork;
  26 struct xfs_inode;
  27 struct xfs_mount;
  28 struct xfs_trans;
  29
  30 /*
  31  * Argument structure for xfs_bmap_alloc.
  32  */
  33 struct 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         bool                    eof;    /* set if allocating past last extent */
  54         bool                    wasdel; /* replacing a delayed allocation */
  55         bool                    userdata;/* set if is user data */
  56         bool                    aeof;   /* allocated space at eof */
  57         bool                    conv;   /* overwriting unwritten extents */
  58         bool                    stack_switch;
  59         bool                    kswapd; /* allocation in kswapd context */
  60         int                     flags;
  61         struct completion       *done;
  62         struct work_struct      work;
  63         int                     result;
  64 };
  65
  66 int     xfs_bmap_finish(struct xfs_trans **tp, struct xfs_bmap_free *flist,
  67                         int *committed);
  68 int     xfs_bmap_rtalloc(struct xfs_bmalloca *ap);
  69 int     xfs_bmapi_allocate(struct xfs_bmalloca *args);
  70 int     __xfs_bmapi_allocate(struct xfs_bmalloca *args);
  71 int     xfs_bmap_eof(struct xfs_inode *ip, xfs_fileoff_t endoff,
  72                      int whichfork, int *eof);
  73 int     xfs_bmap_count_blocks(struct xfs_trans *tp, struct xfs_inode *ip,
  74                               int whichfork, int *count);
  75 int     xfs_bmap_punch_delalloc_range(struct xfs_inode *ip,
  76                 xfs_fileoff_t start_fsb, xfs_fileoff_t length);
  77
  78 /* bmap to userspace formatter - copy to user & advance pointer */
  79 typedef int (*xfs_bmap_format_t)(void **, struct getbmapx *, int *);
  80 int     xfs_getbmap(struct xfs_inode *ip, struct getbmapx *bmv,
  81                 xfs_bmap_format_t formatter, void *arg);
  82
  83 /* functions in xfs_bmap.c that are only needed by xfs_bmap_util.c */
  84 void    xfs_bmap_del_free(struct xfs_bmap_free *flist,
  85                           struct xfs_bmap_free_item *prev,
  86                           struct xfs_bmap_free_item *free);
  87 int     xfs_bmap_extsize_align(struct xfs_mount *mp, struct xfs_bmbt_irec *gotp,
  88                                struct xfs_bmbt_irec *prevp, xfs_extlen_t extsz,
  89                                int rt, int eof, int delay, int convert,
  90                                xfs_fileoff_t *offp, xfs_extlen_t *lenp);
  91 void    xfs_bmap_adjacent(struct xfs_bmalloca *ap);
  92 int     xfs_bmap_last_extent(struct xfs_trans *tp, struct xfs_inode *ip,
  93                              int whichfork, struct xfs_bmbt_irec *rec,
  94                              int *is_empty);
  95
  96 /* preallocation and hole punch interface */
  97 int     xfs_alloc_file_space(struct xfs_inode *ip, xfs_off_t offset,
  98                              xfs_off_t len, int alloc_type);
  99 int     xfs_free_file_space(struct xfs_inode *ip, xfs_off_t offset,
 100                             xfs_off_t len);
 101 int     xfs_zero_file_space(struct xfs_inode *ip, xfs_off_t offset,
 102                             xfs_off_t len);
 103 int     xfs_collapse_file_space(struct xfs_inode *, xfs_off_t offset,
 104                                 xfs_off_t len);
 105
 106 /* EOF block manipulation functions */
 107 bool    xfs_can_free_eofblocks(struct xfs_inode *ip, bool force);
 108 int     xfs_free_eofblocks(struct xfs_mount *mp, struct xfs_inode *ip,
 109                            bool need_iolock);
 110
 111 int     xfs_swap_extents(struct xfs_inode *ip, struct xfs_inode *tip,
 112                          struct xfs_swapext *sx);
 113
 114 xfs_daddr_t xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb);
 115
 116 #endif  /* __XFS_BMAP_UTIL_H__ */