LXR linux/fs/efs/file.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * file.c
   4 *
   5 * Copyright (c) 1999 Al Smith
   6 *
   7 * Portions derived from work (c) 1995,1996 Christian Vogelgsang.
   8 */
   9
  10#include <linux/buffer_head.h>
  11#include "efs.h"
  12
  13int efs_get_block(struct inode *inode, sector_t iblock,
  14                  struct buffer_head *bh_result, int create)
  15{
  16        int error = -EROFS;
  17        long phys;
  18
  19        if (create)
  20                return error;
  21        if (iblock >= inode->i_blocks) {
  22#ifdef DEBUG
  23                /*
  24                 * i have no idea why this happens as often as it does
  25                 */
  26                pr_warn("%s(): block %d >= %ld (filesize %ld)\n",
  27                        __func__, block, inode->i_blocks, inode->i_size);
  28#endif
  29                return 0;
  30        }
  31        phys = efs_map_block(inode, iblock);
  32        if (phys)
  33                map_bh(bh_result, inode->i_sb, phys);
  34        return 0;
  35}
  36
  37int efs_bmap(struct inode *inode, efs_block_t block) {
  38
  39        if (block < 0) {
  40                pr_warn("%s(): block < 0\n", __func__);
  41                return 0;
  42        }
  43
  44        /* are we about to read past the end of a file ? */
  45        if (!(block < inode->i_blocks)) {
  46#ifdef DEBUG
  47                /*
  48                 * i have no idea why this happens as often as it does
  49                 */
  50                pr_warn("%s(): block %d >= %ld (filesize %ld)\n",
  51                        __func__, block, inode->i_blocks, inode->i_size);
  52#endif
  53                return 0;
  54        }
  55
  56        return efs_map_block(inode, block);
  57}
  58