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review.shift-gmbh.com / SHIFTPHONES / mainline / linux / 5469f160e6bf38b84eb237055868286e629b8d44 / . / fs / gfs2 / bmap.h
blob: aed4632d47d30c86f4889487ce638c188da438bd [file] [log] [blame]
Thomas Gleixner7336d0e2019-05-31 01:09:56 -0700[diff] [blame]1/* SPDX-License-Identifier: GPL-2.0-only */
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]2/*
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Steven Whitehouse3a8a9a12006-05-18 15:09:15 -0400[diff] [blame]4 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]5 */
6
7#ifndef __BMAP_DOT_H__
8#define __BMAP_DOT_H__
9
Bob Peterson39743202017-02-16 10:27:16 -0500[diff] [blame]10#include <linux/iomap.h>
11
Steven Whitehouse7ed122e2008-12-10 10:28:10 +0000[diff] [blame]12#include "inode.h"
13
Steven Whitehousef2f7ba52006-09-05 10:39:21 -0400[diff] [blame]14struct inode;
15struct gfs2_inode;
16struct page;
17
Steven Whitehouse7ed122e2008-12-10 10:28:10 +0000[diff] [blame]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
Andreas Gruenbacher628e3662018-06-04 07:56:51 -0500[diff] [blame]46extern const struct iomap_ops gfs2_iomap_ops;
Christoph Hellwig2164f9b2019-07-01 23:54:39 +0200[diff] [blame]47extern const struct iomap_writeback_ops gfs2_writeback_ops;
Andreas Gruenbacher628e3662018-06-04 07:56:51 -0500[diff] [blame]48
Steven Whitehouseff8f33c2010-08-11 09:37:53 +0100[diff] [blame]49extern int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page);
50extern int gfs2_block_map(struct inode *inode, sector_t lblock,
51 struct buffer_head *bh, int create);
Andreas Gruenbacher628e3662018-06-04 07:56:51 -0500[diff] [blame]52extern int gfs2_iomap_get_alloc(struct inode *inode, loff_t pos, loff_t length,
53 struct iomap *iomap);
Steven Whitehouseff8f33c2010-08-11 09:37:53 +0100[diff] [blame]54extern int gfs2_extent_map(struct inode *inode, u64 lblock, int *new,
55 u64 *dblock, unsigned *extlen);
56extern int gfs2_setattr_size(struct inode *inode, u64 size);
57extern void gfs2_trim_blocks(struct inode *inode);
58extern int gfs2_truncatei_resume(struct gfs2_inode *ip);
59extern int gfs2_file_dealloc(struct gfs2_inode *ip);
60extern int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset,
61 unsigned int len);
Steven Whitehouseb50f2272014-03-03 13:35:57 +0000[diff] [blame]62extern int gfs2_map_journal_extents(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd);
63extern void gfs2_free_journal_extents(struct gfs2_jdesc *jd);
Andreas Gruenbacher4e56a642017-12-14 17:11:03 +0100[diff] [blame]64extern int __gfs2_punch_hole(struct file *file, loff_t offset, loff_t length);
Bob Peterson7c70b892019-03-25 09:34:19 -0600[diff] [blame]65extern int gfs2_lblk_to_dblk(struct inode *inode, u32 lblock, u64 *dblock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]66
David Teiglandb3b94fa2006-01-16 16:50:04 +0000[diff] [blame]67#endif /* __BMAP_DOT_H__ */