[linux-2.6-block.git] / fs / gfs2 / bmap.h

/* 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 int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page);
extern int gfs2_block_map(struct inode *inode, sector_t lblock,
			  struct buffer_head *bh, int create);
extern int gfs2_iomap_get_alloc(struct inode *inode, loff_t pos, loff_t length,
				struct iomap *iomap);
extern int gfs2_extent_map(struct inode *inode, u64 lblock, int *new,
			   u64 *dblock, unsigned *extlen);
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);
extern int gfs2_lblk_to_dblk(struct inode *inode, u32 lblock, u64 *dblock);

#endif /* __BMAP_DOT_H__ */
Commit	Line	Data
7336d0e6	1	/* SPDX-License-Identifier: GPL-2.0-only */
b3b94faa DT	2	/*
b3b94faa DT	3	* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3a8a9a10	4	* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
b3b94faa DT	5	*/
	6
	7	#ifndef __BMAP_DOT_H__
	8	#define __BMAP_DOT_H__
	9
3974320c BP	10	#include <linux/iomap.h>
3974320c BP	11
7ed122e4 SW	12	#include "inode.h"
7ed122e4 SW	13
f2f7ba52 SW	14	struct inode;
	15	struct gfs2_inode;
	16	struct page;
	17
7ed122e4 SW	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
	28	static 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
628e366d AG	46	extern const struct iomap_ops gfs2_iomap_ops;
628e366d AG	47
ff8f33c8 SW	48	extern int gfs2_unstuff_dinode(struct gfs2_inode ip, struct page page);
	49	extern int gfs2_block_map(struct inode *inode, sector_t lblock,
	50	struct buffer_head *bh, int create);
628e366d AG	51	extern int gfs2_iomap_get_alloc(struct inode *inode, loff_t pos, loff_t length,
628e366d AG	52	struct iomap *iomap);
ff8f33c8 SW	53	extern int gfs2_extent_map(struct inode inode, u64 lblock, int new,
	54	u64 dblock, unsigned extlen);
	55	extern int gfs2_setattr_size(struct inode *inode, u64 size);
	56	extern void gfs2_trim_blocks(struct inode *inode);
	57	extern int gfs2_truncatei_resume(struct gfs2_inode *ip);
	58	extern int gfs2_file_dealloc(struct gfs2_inode *ip);
	59	extern int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset,
	60	unsigned int len);
b50f227b SW	61	extern int gfs2_map_journal_extents(struct gfs2_sbd sdp, struct gfs2_jdesc jd);
b50f227b SW	62	extern void gfs2_free_journal_extents(struct gfs2_jdesc *jd);
4e56a641	63	extern int __gfs2_punch_hole(struct file *file, loff_t offset, loff_t length);
7c70b896	64	extern int gfs2_lblk_to_dblk(struct inode inode, u32 lblock, u64 dblock);
b3b94faa	65
b3b94faa	66	#endif /* __BMAP_DOT_H__ */