bmap.h

 1/* SPDX-License-Identifier: GPL-2.0-only */
 2/*
 3 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 4 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
 5 */
 6
 7#ifndef __BMAP_DOT_H__
 8#define __BMAP_DOT_H__
 9
10#include <linux/iomap.h>
11
12#include "inode.h"
13
14struct inode;
15struct gfs2_inode;
16struct page;
17
18
19/**
20 * gfs2_write_calc_reserv - calculate number of blocks needed to write to a file
21 * @ip: the file
22 * @len: the number of bytes to be written to the file
23 * @data_blocks: returns the number of data blocks required
24 * @ind_blocks: returns the number of indirect blocks required
25 *
26 */
27
28static inline void gfs2_write_calc_reserv(const struct gfs2_inode *ip,
29					  unsigned int len,
30					  unsigned int *data_blocks,
31					  unsigned int *ind_blocks)
32{
33	const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
34	unsigned int tmp;
35
36	BUG_ON(gfs2_is_dir(ip));
37	*data_blocks = (len >> sdp->sd_sb.sb_bsize_shift) + 3;
38	*ind_blocks = 3 * (sdp->sd_max_height - 1);
39
40	for (tmp = *data_blocks; tmp > sdp->sd_diptrs;) {
41		tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
42		*ind_blocks += tmp;
43	}
44}
45
46extern const struct iomap_ops gfs2_iomap_ops;
47extern const struct iomap_write_ops gfs2_iomap_write_ops;
48extern const struct iomap_writeback_ops gfs2_writeback_ops;
49
50int gfs2_unstuff_dinode(struct gfs2_inode *ip);
51int gfs2_block_map(struct inode *inode, sector_t lblock,
52		   struct buffer_head *bh, int create);
53int gfs2_iomap_get(struct inode *inode, loff_t pos, loff_t length,
54		   struct iomap *iomap);
55int gfs2_iomap_alloc(struct inode *inode, loff_t pos, loff_t length,
56		     struct iomap *iomap);
57int gfs2_get_extent(struct inode *inode, u64 lblock, u64 *dblock,
58		    unsigned int *extlen);
59int gfs2_alloc_extent(struct inode *inode, u64 lblock, u64 *dblock,
60		      unsigned *extlen, bool *new);
61int gfs2_setattr_size(struct inode *inode, u64 size);
62int gfs2_truncatei_resume(struct gfs2_inode *ip);
63int gfs2_file_dealloc(struct gfs2_inode *ip);
64int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset,
65			      unsigned int len);
66int gfs2_map_journal_extents(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd);
67void gfs2_free_journal_extents(struct gfs2_jdesc *jd);
68int __gfs2_punch_hole(struct file *file, loff_t offset, loff_t length);
69
70#endif /* __BMAP_DOT_H__ */