text: /* 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, 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(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__ */
  