/*
   * QNX4 file system, Linux implementation.
   *
   * Version : 0.2.1
   *
   * Using parts of the xiafs filesystem.
   *
   * History :
   *
   * 28-05-1998 by Richard Frowijn : first release.
   * 20-06-1998 by Frank Denis : Linux 2.1.99+ & dcache support.
   */

  #include <linux/buffer_head.h>

  #include "qnx4.h"

  
  static int qnx4_readdir(struct file *filp, void *dirent, filldir_t filldir)
  {

  	struct inode *inode = filp->f_path.dentry->d_inode;

  	unsigned int offset;
  	struct buffer_head *bh;
  	struct qnx4_inode_entry *de;
  	struct qnx4_link_info *le;
  	unsigned long blknum;
  	int ix, ino;
  	int size;

  	QNX4DEBUG((KERN_INFO "qnx4_readdir:i_size = %ld
  ", (long) inode->i_size));
  	QNX4DEBUG((KERN_INFO "filp->f_pos         = %ld
  ", (long) filp->f_pos));

  	while (filp->f_pos < inode->i_size) {
  		blknum = qnx4_block_map( inode, filp->f_pos >> QNX4_BLOCK_SIZE_BITS );
  		bh = sb_bread(inode->i_sb, blknum);
  		if(bh==NULL) {
  			printk(KERN_ERR "qnx4_readdir: bread failed (%ld)
  ", blknum);
  			break;
  		}
  		ix = (int)(filp->f_pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK;
  		while (ix < QNX4_INODES_PER_BLOCK) {
  			offset = ix * QNX4_DIR_ENTRY_SIZE;
  			de = (struct qnx4_inode_entry *) (bh->b_data + offset);
  			size = strlen(de->di_fname);
  			if (size) {
  				if ( !( de->di_status & QNX4_FILE_LINK ) && size > QNX4_SHORT_NAME_MAX )
  					size = QNX4_SHORT_NAME_MAX;
  				else if ( size > QNX4_NAME_MAX )
  					size = QNX4_NAME_MAX;
  
  				if ( ( de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK) ) != 0 ) {

  					QNX4DEBUG((KERN_INFO "qnx4_readdir:%.*s
  ", size, de->di_fname));

  					if ( ( de->di_status & QNX4_FILE_LINK ) == 0 )
  						ino = blknum * QNX4_INODES_PER_BLOCK + ix - 1;
  					else {
  						le  = (struct qnx4_link_info*)de;

  						ino = ( le32_to_cpu(le->dl_inode_blk) - 1 ) *

  							QNX4_INODES_PER_BLOCK +
  							le->dl_inode_ndx;
  					}
  					if (filldir(dirent, de->di_fname, size, filp->f_pos, ino, DT_UNKNOWN) < 0) {
  						brelse(bh);
  						goto out;
  					}
  				}
  			}
  			ix++;
  			filp->f_pos += QNX4_DIR_ENTRY_SIZE;
  		}
  		brelse(bh);
  	}
  out:

  	return 0;
  }

  const struct file_operations qnx4_dir_operations =

  {

  	.llseek		= generic_file_llseek,

  	.read		= generic_read_dir,
  	.readdir	= qnx4_readdir,

  	.fsync		= generic_file_fsync,

  };

  const struct inode_operations qnx4_dir_inode_operations =

  {
  	.lookup		= qnx4_lookup,

  };