blob: a20a5213135a50ae9293da676eb533e9c04063db [file] [log] [blame]
David Teiglandb3b94fa2006-01-16 16:50:04 +00001/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Steven Whitehouse3a8a9a12006-05-18 15:09:15 -04003 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
David Teiglandb3b94fa2006-01-16 16:50:04 +00004 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
Steven Whitehousee9fc2aa2006-09-01 11:05:15 -04007 * of the GNU General Public License version 2.
David Teiglandb3b94fa2006-01-16 16:50:04 +00008 */
9
10#ifndef __BMAP_DOT_H__
11#define __BMAP_DOT_H__
12
Steven Whitehouse7ed122e2008-12-10 10:28:10 +000013#include "inode.h"
14
Steven Whitehousef2f7ba52006-09-05 10:39:21 -040015struct inode;
16struct gfs2_inode;
17struct page;
18
Steven Whitehouse7ed122e2008-12-10 10:28:10 +000019
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
Steven Whitehousef25ef0c2006-07-26 10:51:20 -040047int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page);
Bob Petersone9e1ef22007-12-10 14:13:27 -060048int gfs2_block_map(struct inode *inode, sector_t lblock, struct buffer_head *bh, int create);
Steven Whitehousefd88de562006-05-05 16:59:11 -040049int gfs2_extent_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, unsigned *extlen);
David Teiglandb3b94fa2006-01-16 16:50:04 +000050
Steven Whitehousecd915492006-09-04 12:49:07 -040051int gfs2_truncatei(struct gfs2_inode *ip, u64 size);
David Teiglandb3b94fa2006-01-16 16:50:04 +000052int gfs2_truncatei_resume(struct gfs2_inode *ip);
53int gfs2_file_dealloc(struct gfs2_inode *ip);
Steven Whitehousecd915492006-09-04 12:49:07 -040054int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset,
Bob Peterson461cb412010-06-24 19:21:20 -040055 unsigned int len);
David Teiglandb3b94fa2006-01-16 16:50:04 +000056
David Teiglandb3b94fa2006-01-16 16:50:04 +000057#endif /* __BMAP_DOT_H__ */