i386/linux-2.3.21/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/efs_fs.h>
  10
  11 int efs_get_block(struct inode *inode, long iblock,
  12                   struct buffer_head *bh_result, int create)
  13 {
  14         int error = -EROFS;
  15         long phys;
  16
  17         if (create)
  18                 return error;
  19         if (iblock >= inode->i_blocks) {
  20 #ifdef DEBUG
  21                 /*
  22                  * i have no idea why this happens as often as it does
  23                  */
  24                 printk(KERN_WARNING "EFS: bmap(): block %d >= %ld (filesize %ld)\n",
  25                         block,
  26                         inode->i_blocks,
  27                         inode->i_size);
  28 #endif
  29                 return 0;
  30         }
  31         phys = efs_map_block(inode, iblock);
  32         if (phys) {
  33                 bh_result->b_dev = inode->i_dev;
  34                 bh_result->b_blocknr = phys;
  35                 bh_result->b_state |= (1UL << BH_Mapped);
  36         }
  37         return 0;
  38 }
  39
  40 int efs_bmap(struct inode *inode, efs_block_t block) {
  41
  42         if (block < 0) {
  43                 printk(KERN_WARNING "EFS: bmap(): block < 0\n");
  44                 return 0;
  45         }
  46
  47         /* are we about to read past the end of a file ? */
  48         if (!(block < inode->i_blocks)) {
  49 #ifdef DEBUG
  50                 /*
  51                  * i have no idea why this happens as often as it does
  52                  */
  53                 printk(KERN_WARNING "EFS: bmap(): block %d >= %ld (filesize %ld)\n",
  54                         block,
  55                         inode->i_blocks,
  56                         inode->i_size);
  57 #endif
  58                 return 0;
  59         }
  60
  61         return efs_map_block(inode, block);
  62 }
  63
  64 static struct file_operations efs_file_operations = {
  65         NULL,                   /* lseek */
  66         generic_file_read,      /* read */
  67         NULL,                   /* write */
  68         NULL,                   /* readdir */
  69         NULL,                   /* poll */
  70         NULL,                   /* ioctl */
  71         generic_file_mmap,      /* mmap */
  72         NULL,                   /* open */
  73         NULL,                   /* flush */
  74         NULL,                   /* release */
  75         NULL,                   /* fsync */
  76         NULL,                   /* fasync */
  77         NULL,                   /* check_media_change */
  78         NULL                    /* revalidate */
  79 };
  80
  81 struct inode_operations efs_file_inode_operations = {
  82         &efs_file_operations,   /* default file operations */
  83         NULL,                   /* create */
  84         NULL,                   /* lookup */
  85         NULL,                   /* link */
  86         NULL,                   /* unlink */
  87         NULL,                   /* symlink */
  88         NULL,                   /* mkdir */
  89         NULL,                   /* rmdir */
  90         NULL,                   /* mknod */
  91         NULL,                   /* rename */
  92         NULL,                   /* readlink */
  93         NULL,                   /* follow_link */
  94         efs_get_block,          /* get_block */
  95         block_read_full_page,   /* readpage */
  96         NULL,                   /* writepage */
  97         NULL,                   /* flushpage */
  98         NULL,                   /* truncate */
  99         NULL,                   /* permission */
 100         NULL,                   /* smap */
 101         NULL                    /* revalidate */
 102 };