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 "inode.h"
14
15struct inode;
16struct gfs2_inode;
17struct page;
18
19
20/**
21 * gfs2_write_calc_reserv - calculate number of blocks needed to write to a file
22 * @ip: the file
23 * @len: the number of bytes to be written to the file
24 * @data_blocks: returns the number of data blocks required
25 * @ind_blocks: returns the number of indirect blocks required
26 *
27 */
28
29static inline void gfs2_write_calc_reserv(const struct gfs2_inode *ip,
30					  unsigned int len,
31					  unsigned int *data_blocks,
32					  unsigned int *ind_blocks)
33{
34	const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
35	unsigned int tmp;
36
37	BUG_ON(gfs2_is_dir(ip));
38	*data_blocks = (len >> sdp->sd_sb.sb_bsize_shift) + 3;
39	*ind_blocks = 3 * (sdp->sd_max_height - 1);
40
41	for (tmp = *data_blocks; tmp > sdp->sd_diptrs;) {
42		tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
43		*ind_blocks += tmp;
44	}
45}
46
47int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page);
48int gfs2_block_map(struct inode *inode, sector_t lblock, struct buffer_head *bh, int create);
49int gfs2_extent_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, unsigned *extlen);
50
51int gfs2_truncatei(struct gfs2_inode *ip, u64 size);
52int gfs2_truncatei_resume(struct gfs2_inode *ip);
53int gfs2_file_dealloc(struct gfs2_inode *ip);
54int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset,
55			      unsigned int len);
56
57#endif /* __BMAP_DOT_H__ */
58