Linux kernel mirror (for testing)
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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_map_journal_extents(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd);
65extern void gfs2_free_journal_extents(struct gfs2_jdesc *jd);
66extern int __gfs2_punch_hole(struct file *file, loff_t offset, loff_t length);
67
68#endif /* __BMAP_DOT_H__ */