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_extent_free_item;
  25 struct xfs_ifork;
  26 struct xfs_inode;
  27 struct xfs_mount;
  28 struct xfs_trans;
  29 struct xfs_bmalloca;
  30
  31 #ifdef CONFIG_XFS_RT
  32 int     xfs_bmap_rtalloc(struct xfs_bmalloca *ap);
  33 #else /* !CONFIG_XFS_RT */
  34 /*
  35  * Attempts to allocate RT extents when RT is disable indicates corruption and
  36  * should trigger a shutdown.
  37  */
  38 static inline int
  39 xfs_bmap_rtalloc(struct xfs_bmalloca *ap)
  40 {
  41         return -EFSCORRUPTED;
  42 }
  43 #endif /* CONFIG_XFS_RT */
  44
  45 int     xfs_bmap_eof(struct xfs_inode *ip, xfs_fileoff_t endoff,
  46                      int whichfork, int *eof);
  47 int     xfs_bmap_punch_delalloc_range(struct xfs_inode *ip,
  48                 xfs_fileoff_t start_fsb, xfs_fileoff_t length);
  49
  50 struct kgetbmap {
  51         __s64           bmv_offset;     /* file offset of segment in blocks */
  52         __s64           bmv_block;      /* starting block (64-bit daddr_t)  */
  53         __s64           bmv_length;     /* length of segment, blocks        */
  54         __s32           bmv_oflags;     /* output flags */
  55 };
  56 int     xfs_getbmap(struct xfs_inode *ip, struct getbmapx *bmv,
  57                 struct kgetbmap *out);
  58
  59 /* functions in xfs_bmap.c that are only needed by xfs_bmap_util.c */
  60 int     xfs_bmap_extsize_align(struct xfs_mount *mp, struct xfs_bmbt_irec *gotp,
  61                                struct xfs_bmbt_irec *prevp, xfs_extlen_t extsz,
  62                                int rt, int eof, int delay, int convert,
  63                                xfs_fileoff_t *offp, xfs_extlen_t *lenp);
  64 void    xfs_bmap_adjacent(struct xfs_bmalloca *ap);
  65 int     xfs_bmap_last_extent(struct xfs_trans *tp, struct xfs_inode *ip,
  66                              int whichfork, struct xfs_bmbt_irec *rec,
  67                              int *is_empty);
  68
  69 /* preallocation and hole punch interface */
  70 int     xfs_alloc_file_space(struct xfs_inode *ip, xfs_off_t offset,
  71                              xfs_off_t len, int alloc_type);
  72 int     xfs_free_file_space(struct xfs_inode *ip, xfs_off_t offset,
  73                             xfs_off_t len);
  74 int     xfs_zero_file_space(struct xfs_inode *ip, xfs_off_t offset,
  75                             xfs_off_t len);
  76 int     xfs_collapse_file_space(struct xfs_inode *, xfs_off_t offset,
  77                                 xfs_off_t len);
  78 int     xfs_insert_file_space(struct xfs_inode *, xfs_off_t offset,
  79                                 xfs_off_t len);
  80
  81 /* EOF block manipulation functions */
  82 bool    xfs_can_free_eofblocks(struct xfs_inode *ip, bool force);
  83 int     xfs_free_eofblocks(struct xfs_inode *ip);
  84
  85 int     xfs_swap_extents(struct xfs_inode *ip, struct xfs_inode *tip,
  86                          struct xfs_swapext *sx);
  87
  88 xfs_daddr_t xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb);
  89
  90 xfs_extnum_t xfs_bmap_count_leaves(struct xfs_ifork *ifp, xfs_filblks_t *count);
  91 int xfs_bmap_count_blocks(struct xfs_trans *tp, struct xfs_inode *ip,
  92                           int whichfork, xfs_extnum_t *nextents,
  93                           xfs_filblks_t *count);
  94
  95 #endif  /* __XFS_BMAP_UTIL_H__ */