LXR linux/fs/gfs2/bmap.h

   1/*
   2 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4 *
   5 * This copyrighted material is made available to anyone wishing to use,
   6 * modify, copy, or redistribute it subject to the terms and conditions
   7 * of the GNU General Public License version 2.
   8 */
   9
  10#ifndef __BMAP_DOT_H__
  11#define __BMAP_DOT_H__
  12
  13#include <linux/iomap.h>
  14
  15#include "inode.h"
  16
  17struct inode;
  18struct gfs2_inode;
  19struct page;
  20
  21
  22/**
  23 * gfs2_write_calc_reserv - calculate number of blocks needed to write to a file
  24 * @ip: the file
  25 * @len: the number of bytes to be written to the file
  26 * @data_blocks: returns the number of data blocks required
  27 * @ind_blocks: returns the number of indirect blocks required
  28 *
  29 */
  30
  31static inline void gfs2_write_calc_reserv(const struct gfs2_inode *ip,
  32                                          unsigned int len,
  33                                          unsigned int *data_blocks,
  34                                          unsigned int *ind_blocks)
  35{
  36        const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
  37        unsigned int tmp;
  38
  39        BUG_ON(gfs2_is_dir(ip));
  40        *data_blocks = (len >> sdp->sd_sb.sb_bsize_shift) + 3;
  41        *ind_blocks = 3 * (sdp->sd_max_height - 1);
  42
  43        for (tmp = *data_blocks; tmp > sdp->sd_diptrs;) {
  44                tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
  45                *ind_blocks += tmp;
  46        }
  47}
  48
  49extern const struct iomap_ops gfs2_iomap_ops;
  50
  51extern int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page);
  52extern int gfs2_block_map(struct inode *inode, sector_t lblock,
  53                          struct buffer_head *bh, int create);
  54extern int gfs2_iomap_get_alloc(struct inode *inode, loff_t pos, loff_t length,
  55                                struct iomap *iomap);
  56extern int gfs2_extent_map(struct inode *inode, u64 lblock, int *new,
  57                           u64 *dblock, unsigned *extlen);
  58extern int gfs2_setattr_size(struct inode *inode, u64 size);
  59extern void gfs2_trim_blocks(struct inode *inode);
  60extern int gfs2_truncatei_resume(struct gfs2_inode *ip);
  61extern int gfs2_file_dealloc(struct gfs2_inode *ip);
  62extern int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset,
  63                                     unsigned int len);
  64extern int __gfs2_punch_hole(struct file *file, loff_t offset, loff_t length);
  65extern int gfs2_map_journal_extents(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd);
  66extern void gfs2_free_journal_extents(struct gfs2_jdesc *jd);
  67
  68#endif /* __BMAP_DOT_H__ */
  69