LXR linux/fs/gfs2/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_writeback_ops gfs2_writeback_ops;
  48
  49extern int gfs2_unstuff_dinode(struct gfs2_inode *ip);
  50extern int gfs2_block_map(struct inode *inode, sector_t lblock,
  51                          struct buffer_head *bh, int create);
  52extern int gfs2_iomap_get(struct inode *inode, loff_t pos, loff_t length,
  53                          struct iomap *iomap);
  54extern int gfs2_iomap_alloc(struct inode *inode, loff_t pos, loff_t length,
  55                            struct iomap *iomap);
  56extern int gfs2_get_extent(struct inode *inode, u64 lblock, u64 *dblock,
  57                           unsigned int *extlen);
  58extern int gfs2_alloc_extent(struct inode *inode, u64 lblock, u64 *dblock,
  59                             unsigned *extlen, bool *new);
  60extern int gfs2_setattr_size(struct inode *inode, u64 size);
  61extern void gfs2_trim_blocks(struct inode *inode);
  62extern int gfs2_truncatei_resume(struct gfs2_inode *ip);
  63extern int gfs2_file_dealloc(struct gfs2_inode *ip);
  64extern int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset,
  65                                     unsigned int len);
  66extern int gfs2_map_journal_extents(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd);
  67extern void gfs2_free_journal_extents(struct gfs2_jdesc *jd);
  68extern int __gfs2_punch_hole(struct file *file, loff_t offset, loff_t length);
  69
  70#endif /* __BMAP_DOT_H__ */
  71