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
  13 int 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
  37 int 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 }