1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
*/
#ifndef __BMAP_DOT_H__
#define __BMAP_DOT_H__
#include <linux/iomap.h>
#include "inode.h"
struct inode;
struct gfs2_inode;
struct page;
/**
* gfs2_write_calc_reserv - calculate number of blocks needed to write to a file
* @ip: the file
* @len: the number of bytes to be written to the file
* @data_blocks: returns the number of data blocks required
* @ind_blocks: returns the number of indirect blocks required
*
*/
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 const struct iomap_ops gfs2_iomap_ops;
extern const struct iomap_writeback_ops gfs2_writeback_ops;
extern int gfs2_unstuff_dinode(struct gfs2_inode *ip);
extern int gfs2_block_map(struct inode *inode, sector_t lblock,
struct buffer_head *bh, int create);
extern int gfs2_iomap_get(struct inode *inode, loff_t pos, loff_t length,
struct iomap *iomap);
extern int gfs2_iomap_alloc(struct inode *inode, loff_t pos, loff_t length,
struct iomap *iomap);
extern int gfs2_get_extent(struct inode *inode, u64 lblock, u64 *dblock,
unsigned int *extlen);
extern int gfs2_alloc_extent(struct inode *inode, u64 lblock, u64 *dblock,
unsigned *extlen, bool *new);
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);
extern int gfs2_map_journal_extents(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd);
extern void gfs2_free_journal_extents(struct gfs2_jdesc *jd);
extern int __gfs2_punch_hole(struct file *file, loff_t offset, loff_t length);
#endif /* __BMAP_DOT_H__ */
|
