root/fs/efs/file.c

DEFINITIONS

1. efs_get_block
2. efs_bmap

/*
 * file.c
 *
 * Copyright (c) 1999 Al Smith
 *
 * Portions derived from work (c) 1995,1996 Christian Vogelgsang.
 */

#include <linux/buffer_head.h>
#include "efs.h"

int efs_get_block(struct inode *inode, sector_t iblock,
                  struct buffer_head *bh_result, int create)
{
        int error = -EROFS;
        long phys;

        if (create)
                return error;
        if (iblock >= inode->i_blocks) {
#ifdef DEBUG
                /*
                 * i have no idea why this happens as often as it does
                 */
                printk(KERN_WARNING "EFS: bmap(): block %d >= %ld (filesize %ld)\n",
                        block,
                        inode->i_blocks,
                        inode->i_size);
#endif
                return 0;
        }
        phys = efs_map_block(inode, iblock);
        if (phys)
                map_bh(bh_result, inode->i_sb, phys);
        return 0;
}

int efs_bmap(struct inode *inode, efs_block_t block) {

        if (block < 0) {
                printk(KERN_WARNING "EFS: bmap(): block < 0\n");
                return 0;
        }

        /* are we about to read past the end of a file ? */
        if (!(block < inode->i_blocks)) {
#ifdef DEBUG
                /*
                 * i have no idea why this happens as often as it does
                 */
                printk(KERN_WARNING "EFS: bmap(): block %d >= %ld (filesize %ld)\n",
                        block,
                        inode->i_blocks,
                        inode->i_size);
#endif
                return 0;
        }

        return efs_map_block(inode, block);
}