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
  12 int 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
  38 int 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 }