root/fs/gfs2/bmap.h

INCLUDED FROM

DEFINITIONS

1. gfs2_write_calc_reserv

   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 
  14 struct inode;
  15 struct gfs2_inode;
  16 struct 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 
  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 
  46 extern const struct iomap_ops gfs2_iomap_ops;
  47 
  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);
  51 extern int gfs2_iomap_get_alloc(struct inode *inode, loff_t pos, loff_t length,
  52                                 struct iomap *iomap);
  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);
  61 extern int gfs2_map_journal_extents(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd);
  62 extern void gfs2_free_journal_extents(struct gfs2_jdesc *jd);
  63 extern int __gfs2_punch_hole(struct file *file, loff_t offset, loff_t length);
  64 extern int gfs2_lblk_to_dblk(struct inode *inode, u32 lblock, u64 *dblock);
  65 
  66 #endif /* __BMAP_DOT_H__ */