LXR linux/fs/efs/file.c

   1/*
   2 * file.c
   3 *
   4 * Copyright (c) 1999 Al Smith
   5 *
   6 * Portions derived from work (c) 1995,1996 Christian Vogelgsang.
   7 */
   8
   9#include <linux/buffer_head.h>
  10#include <linux/efs_fs.h>
  11
  12int efs_get_block(struct inode *inode, sector_t iblock,
  13                  struct buffer_head *bh_result, int create)
  14{
  15        int error = -EROFS;
  16        long phys;
  17
  18        if (create)
  19                return error;
  20        if (iblock >= inode->i_blocks) {
  21#ifdef DEBUG
  22                /*
  23                 * i have no idea why this happens as often as it does
  24                 */
  25                printk(KERN_WARNING "EFS: bmap(): block %d >= %ld (filesize %ld)\n",
  26                        block,
  27                        inode->i_blocks,
  28                        inode->i_size);
  29#endif
  30                return 0;
  31        }
  32        phys = efs_map_block(inode, iblock);
  33        if (phys)
  34                map_bh(bh_result, inode->i_sb, phys);
  35        return 0;
  36}
  37
  38int efs_bmap(struct inode *inode, efs_block_t block) {
  39
  40        if (block < 0) {
  41                printk(KERN_WARNING "EFS: bmap(): block < 0\n");
  42                return 0;
  43        }
  44
  45        /* are we about to read past the end of a file ? */
  46        if (!(block < inode->i_blocks)) {
  47#ifdef DEBUG
  48                /*
  49                 * i have no idea why this happens as often as it does
  50                 */
  51                printk(KERN_WARNING "EFS: bmap(): block %d >= %ld (filesize %ld)\n",
  52                        block,
  53                        inode->i_blocks,
  54                        inode->i_size);
  55#endif
  56                return 0;
  57        }
  58
  59        return efs_map_block(inode, block);
  60}
  61