bmap.h

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/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License version 2.
 */

#ifndef __BMAP_DOT_H__
#define __BMAP_DOT_H__

#include "inode.h"

struct inode;
struct gfs2_inode;
struct page;


static inline void gfs2_write_calc_reserv(const struct gfs2_inode *ip,
                      unsigned int len,
                      unsigned int *data_blocks,
                      unsigned int *ind_blocks)
{
    const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
    unsigned int tmp;

    BUG_ON(gfs2_is_dir(ip));
    *data_blocks = (len >> sdp->sd_sb.sb_bsize_shift) + 3;
    *ind_blocks = 3 * (sdp->sd_max_height - 1);

    for (tmp = *data_blocks; tmp > sdp->sd_diptrs;) {
        tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
        *ind_blocks += tmp;
    }
}

extern int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page);
extern int gfs2_block_map(struct inode *inode, sector_t lblock,
              struct buffer_head *bh, int create);
extern int gfs2_extent_map(struct inode *inode, u64 lblock, int *new,
               u64 *dblock, unsigned *extlen);
extern int gfs2_setattr_size(struct inode *inode, u64 size);
extern void gfs2_trim_blocks(struct inode *inode);
extern int gfs2_truncatei_resume(struct gfs2_inode *ip);
extern int gfs2_file_dealloc(struct gfs2_inode *ip);
extern int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset,
                     unsigned int len);

#endif /* __BMAP_DOT_H__ */