C++ reiserfs_add_entry函数代码示例

static int reiserfs_link(struct dentry *old_dentry, struct inode *dir,
			 struct dentry *dentry)
{
	int retval;
	struct inode *inode = d_inode(old_dentry);
	struct reiserfs_transaction_handle th;
	/*
	 * We need blocks for transaction + update of quotas for
	 * the owners of the directory
	 */
	int jbegin_count =
	    JOURNAL_PER_BALANCE_CNT * 3 +
	    2 * REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb);

	retval = dquot_initialize(dir);
	if (retval)
		return retval;

	reiserfs_write_lock(dir->i_sb);
	if (inode->i_nlink >= REISERFS_LINK_MAX) {
		/* FIXME: sd_nlink is 32 bit for new files */
		reiserfs_write_unlock(dir->i_sb);
		return -EMLINK;
	}

	/* inc before scheduling so reiserfs_unlink knows we are here */
	inc_nlink(inode);

	retval = journal_begin(&th, dir->i_sb, jbegin_count);
	if (retval) {
		drop_nlink(inode);
		reiserfs_write_unlock(dir->i_sb);
		return retval;
	}

	/* create new entry */
	retval =
	    reiserfs_add_entry(&th, dir, dentry->d_name.name,
			       dentry->d_name.len, inode, 1 /*visible */ );

	reiserfs_update_inode_transaction(inode);
	reiserfs_update_inode_transaction(dir);

	if (retval) {
		int err;
		drop_nlink(inode);
		err = journal_end(&th);
		reiserfs_write_unlock(dir->i_sb);
		return err ? err : retval;
	}

	inode->i_ctime = current_time(inode);
	reiserfs_update_sd(&th, inode);

	ihold(inode);
	d_instantiate(dentry, inode);
	retval = journal_end(&th);
	reiserfs_write_unlock(dir->i_sb);
	return retval;
}

int reiserfs_link (struct dentry * old_dentry, struct inode * dir, struct dentry * dentry)
{
  struct inode *inode = old_dentry->d_inode;
  struct path path_to_entry;
  struct reiserfs_dir_entry de;
  int error;
  int windex ;
  struct reiserfs_transaction_handle th ;
  int jbegin_count = JOURNAL_PER_BALANCE_CNT * 3; 
  
  init_path (&path_to_entry);

  /* object must not be directory */
  if (S_ISDIR(inode->i_mode)) {
    return -EPERM;
  }
  
  /* file has too many links */
  if (inode->i_nlink >= REISERFS_LINK_MAX) {
    return -EMLINK;
  }

  journal_begin(&th, dir->i_sb, jbegin_count) ;
  windex = push_journal_writer("reiserfs_link") ;

  reiserfs_update_inode_transaction(inode) ;
  reiserfs_update_inode_transaction(dir) ;

  de.de_gen_number_bit_string = 0;
  if (reiserfs_find_entry (dir, dentry->d_name.name, dentry->d_name.len, &path_to_entry, &de) == POSITION_FOUND) {
    pathrelse (&path_to_entry);
    pop_journal_writer(windex) ;
    journal_end(&th, dir->i_sb, jbegin_count) ;
    return -EEXIST;
  }
  
  pathrelse (&path_to_entry);

  /* free preserve list if we should */
/*  maybe_free_preserve_list (dir->i_sb);*/

  /* create new entry */
  error = reiserfs_add_entry (&th, dir, dentry->d_name.name, dentry->d_name.len, INODE_PKEY (inode), &de, 1);
  if (error) {
    pop_journal_writer(windex) ;
    journal_end(&th, dir->i_sb, jbegin_count) ;
    return error;
  }
  inode->i_nlink++;
  inode->i_ctime = CURRENT_TIME;
  if_in_ram_update_sd (&th, inode);
  if_in_ram_update_sd (&th, dir);
  inode->i_count++;
  d_instantiate(dentry, inode);
  pop_journal_writer(windex) ;
  journal_end(&th, dir->i_sb, jbegin_count) ;
  return 0;
}

static int reiserfs_link(struct dentry *old_dentry, struct inode *dir,
			 struct dentry *dentry)
{
	int retval;
	struct inode *inode = old_dentry->d_inode;
	struct reiserfs_transaction_handle th;
	/* We need blocks for transaction + update of quotas for the owners of the directory */
	int jbegin_count =
	    JOURNAL_PER_BALANCE_CNT * 3 +
	    2 * REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb);

	reiserfs_write_lock(dir->i_sb);
	if (inode->i_nlink >= REISERFS_LINK_MAX) {
		//FIXME: sd_nlink is 32 bit for new files
		reiserfs_write_unlock(dir->i_sb);
		return -EMLINK;
	}
	if (inode->i_nlink == 0) {
		reiserfs_write_unlock(dir->i_sb);
		return -ENOENT;
	}

	/* inc before scheduling so reiserfs_unlink knows we are here */
	inode->i_nlink++;

	retval = journal_begin(&th, dir->i_sb, jbegin_count);
	if (retval) {
		inode->i_nlink--;
		reiserfs_write_unlock(dir->i_sb);
		return retval;
	}

	/* create new entry */
	retval =
	    reiserfs_add_entry(&th, dir, dentry->d_name.name,
			       dentry->d_name.len, inode, 1 /*visible */ );

	reiserfs_update_inode_transaction(inode);
	reiserfs_update_inode_transaction(dir);

	if (retval) {
		int err;
		inode->i_nlink--;
		err = journal_end(&th, dir->i_sb, jbegin_count);
		reiserfs_write_unlock(dir->i_sb);
		return err ? err : retval;
	}

	inode->i_ctime = CURRENT_TIME_SEC;
	reiserfs_update_sd(&th, inode);

	atomic_inc(&inode->i_count);
	d_instantiate(dentry, inode);
	retval = journal_end(&th, dir->i_sb, jbegin_count);
	reiserfs_write_unlock(dir->i_sb);
	return retval;
}

static int reiserfs_create (struct inode * dir, struct dentry *dentry, int mode,
		struct nameidata *nd)
{
    int retval;
    struct inode * inode;
    int jbegin_count = JOURNAL_PER_BALANCE_CNT * 2 ;
    struct reiserfs_transaction_handle th ;
    int locked;

    if (!(inode = new_inode(dir->i_sb))) {
	return -ENOMEM ;
    }
    retval = new_inode_init(inode, dir, mode);
    if (retval)
        return retval;

    locked = reiserfs_cache_default_acl (dir);

    reiserfs_write_lock(dir->i_sb);

    if (locked)
        reiserfs_write_lock_xattrs (dir->i_sb);

    journal_begin(&th, dir->i_sb, jbegin_count) ;
    retval = reiserfs_new_inode (&th, dir, mode, 0, 0/*i_size*/, dentry, inode);

    if (locked)
        reiserfs_write_unlock_xattrs (dir->i_sb);

    if (retval) {
        goto out_failed;
    }
	
    inode->i_op = &reiserfs_file_inode_operations;
    inode->i_fop = &reiserfs_file_operations;
    inode->i_mapping->a_ops = &reiserfs_address_space_operations ;

    retval = reiserfs_add_entry (&th, dir, dentry->d_name.name, dentry->d_name.len, 
				inode, 1/*visible*/);
    if (retval) {
	inode->i_nlink--;
	reiserfs_update_sd (&th, inode);
	journal_end(&th, dir->i_sb, jbegin_count) ;
	iput (inode);
	goto out_failed;
    }
    reiserfs_update_inode_transaction(inode) ;
    reiserfs_update_inode_transaction(dir) ;

    d_instantiate(dentry, inode);
    journal_end(&th, dir->i_sb, jbegin_count) ;

out_failed:
    reiserfs_write_unlock(dir->i_sb);
    return retval;
}

int reiserfs_create (struct inode * dir, struct dentry *dentry, int mode)
{
  int error;
  struct inode * inode;
  struct reiserfs_dir_entry de;
  int windex ;
  int jbegin_count = JOURNAL_PER_BALANCE_CNT * 2 ;
  struct reiserfs_transaction_handle th ;
  int err;
	
  if (!dir)
    return -ENOENT;
	
  inode = get_empty_inode() ;
  if (!inode) {
    return -ENOSPC ;
  }
  journal_begin(&th, dir->i_sb, jbegin_count) ;
  th.t_caller = "create" ;
  windex = push_journal_writer("reiserfs_create") ;
  inode = reiserfs_new_inode (&th, dir, mode, 0, dentry, inode, &err);
  if (!inode) {
    pop_journal_writer(windex) ;
    journal_end(&th, dir->i_sb, jbegin_count) ;
    return err;
  }
  reiserfs_update_inode_transaction(inode) ;
  reiserfs_update_inode_transaction(dir) ;
	
  inode->i_op = &reiserfs_file_inode_operations;
  inode->i_mode = mode;

  error = reiserfs_add_entry (&th, dir, dentry->d_name.name, dentry->d_name.len, INODE_PKEY (inode), &de, 1);
  if (error) {
    inode->i_nlink--;
    if_in_ram_update_sd (&th, inode);
    pop_journal_writer(windex) ;
    journal_end(&th, dir->i_sb, jbegin_count) ;
    iput (inode);
    return error;
  }
  if_in_ram_update_sd (&th, dir); 
  d_instantiate(dentry, inode);
  pop_journal_writer(windex) ;
  journal_end(&th, dir->i_sb, jbegin_count) ;
  return 0;
}

static int reiserfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
			   struct nameidata *nd)
{
	int retval;
	struct inode *inode;
	/* We need blocks for transaction + (user+group)*(quotas for new inode + update of quota for directory owner) */
	int jbegin_count =
	    JOURNAL_PER_BALANCE_CNT * 2 +
	    2 * (REISERFS_QUOTA_INIT_BLOCKS(dir->i_sb) +
		 REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb));
	struct reiserfs_transaction_handle th;
	struct reiserfs_security_handle security;

	dquot_initialize(dir);

	if (!(inode = new_inode(dir->i_sb))) {
		return -ENOMEM;
	}
	new_inode_init(inode, dir, mode);

	jbegin_count += reiserfs_cache_default_acl(dir);
	retval = reiserfs_security_init(dir, inode, &dentry->d_name, &security);
	if (retval < 0) {
		drop_new_inode(inode);
		return retval;
	}
	jbegin_count += retval;
	reiserfs_write_lock(dir->i_sb);

	retval = journal_begin(&th, dir->i_sb, jbegin_count);
	if (retval) {
		drop_new_inode(inode);
		goto out_failed;
	}

	retval =
	    reiserfs_new_inode(&th, dir, mode, NULL, 0 /*i_size */ , dentry,
			       inode, &security);
	if (retval)
		goto out_failed;

	inode->i_op = &reiserfs_file_inode_operations;
	inode->i_fop = &reiserfs_file_operations;
	inode->i_mapping->a_ops = &reiserfs_address_space_operations;

	retval =
	    reiserfs_add_entry(&th, dir, dentry->d_name.name,
			       dentry->d_name.len, inode, 1 /*visible */ );
	if (retval) {
		int err;
		drop_nlink(inode);
		reiserfs_update_sd(&th, inode);
		err = journal_end(&th, dir->i_sb, jbegin_count);
		if (err)
			retval = err;
		unlock_new_inode(inode);
		iput(inode);
		goto out_failed;
	}
	reiserfs_update_inode_transaction(inode);
	reiserfs_update_inode_transaction(dir);

	unlock_new_inode(inode);
	d_instantiate(dentry, inode);
	retval = journal_end(&th, dir->i_sb, jbegin_count);

      out_failed:
	reiserfs_write_unlock(dir->i_sb);
	return retval;
}

/*
 * process, that is going to call fix_nodes/do_balance must hold only
 * one path. If it holds 2 or more, it can get into endless waiting in
 * get_empty_nodes or its clones
 */
static int reiserfs_rename(struct inode *old_dir, struct dentry *old_dentry,
			   struct inode *new_dir, struct dentry *new_dentry)
{
	int retval;
	INITIALIZE_PATH(old_entry_path);
	INITIALIZE_PATH(new_entry_path);
	INITIALIZE_PATH(dot_dot_entry_path);
	struct item_head new_entry_ih, old_entry_ih, dot_dot_ih;
	struct reiserfs_dir_entry old_de, new_de, dot_dot_de;
	struct inode *old_inode, *new_dentry_inode;
	struct reiserfs_transaction_handle th;
	int jbegin_count;
	umode_t old_inode_mode;
	unsigned long savelink = 1;
	struct timespec ctime;

	/* three balancings: (1) old name removal, (2) new name insertion
	   and (3) maybe "save" link insertion
	   stat data updates: (1) old directory,
	   (2) new directory and (3) maybe old object stat data (when it is
	   directory) and (4) maybe stat data of object to which new entry
	   pointed initially and (5) maybe block containing ".." of
	   renamed directory
	   quota updates: two parent directories */
	jbegin_count =
	    JOURNAL_PER_BALANCE_CNT * 3 + 5 +
	    4 * REISERFS_QUOTA_TRANS_BLOCKS(old_dir->i_sb);

	dquot_initialize(old_dir);
	dquot_initialize(new_dir);

	old_inode = old_dentry->d_inode;
	new_dentry_inode = new_dentry->d_inode;

	// make sure, that oldname still exists and points to an object we
	// are going to rename
	old_de.de_gen_number_bit_string = NULL;
	reiserfs_write_lock(old_dir->i_sb);
	retval =
	    reiserfs_find_entry(old_dir, old_dentry->d_name.name,
				old_dentry->d_name.len, &old_entry_path,
				&old_de);
	pathrelse(&old_entry_path);
	if (retval == IO_ERROR) {
		reiserfs_write_unlock(old_dir->i_sb);
		return -EIO;
	}

	if (retval != NAME_FOUND || old_de.de_objectid != old_inode->i_ino) {
		reiserfs_write_unlock(old_dir->i_sb);
		return -ENOENT;
	}

	old_inode_mode = old_inode->i_mode;
	if (S_ISDIR(old_inode_mode)) {
		// make sure, that directory being renamed has correct ".."
		// and that its new parent directory has not too many links
		// already

		if (new_dentry_inode) {
			if (!reiserfs_empty_dir(new_dentry_inode)) {
				reiserfs_write_unlock(old_dir->i_sb);
				return -ENOTEMPTY;
			}
		}

		/* directory is renamed, its parent directory will be changed,
		 ** so find ".." entry
		 */
		dot_dot_de.de_gen_number_bit_string = NULL;
		retval =
		    reiserfs_find_entry(old_inode, "..", 2, &dot_dot_entry_path,
					&dot_dot_de);
		pathrelse(&dot_dot_entry_path);
		if (retval != NAME_FOUND) {
			reiserfs_write_unlock(old_dir->i_sb);
			return -EIO;
		}

		/* inode number of .. must equal old_dir->i_ino */
		if (dot_dot_de.de_objectid != old_dir->i_ino) {
			reiserfs_write_unlock(old_dir->i_sb);
			return -EIO;
		}
	}

	retval = journal_begin(&th, old_dir->i_sb, jbegin_count);
	if (retval) {
		reiserfs_write_unlock(old_dir->i_sb);
		return retval;
	}

	/* add new entry (or find the existing one) */
	retval =
	    reiserfs_add_entry(&th, new_dir, new_dentry->d_name.name,
//.........这里部分代码省略.........

static int reiserfs_symlink(struct inode *parent_dir,
			    struct dentry *dentry, const char *symname)
{
	int retval;
	struct inode *inode;
	char *name;
	int item_len;
	struct reiserfs_transaction_handle th;
	struct reiserfs_security_handle security;
	int mode = S_IFLNK | S_IRWXUGO;
	/* We need blocks for transaction + (user+group)*(quotas for new inode + update of quota for directory owner) */
	int jbegin_count =
	    JOURNAL_PER_BALANCE_CNT * 3 +
	    2 * (REISERFS_QUOTA_INIT_BLOCKS(parent_dir->i_sb) +
		 REISERFS_QUOTA_TRANS_BLOCKS(parent_dir->i_sb));

	dquot_initialize(parent_dir);

	if (!(inode = new_inode(parent_dir->i_sb))) {
		return -ENOMEM;
	}
	new_inode_init(inode, parent_dir, mode);

	retval = reiserfs_security_init(parent_dir, inode, &dentry->d_name,
					&security);
	if (retval < 0) {
		drop_new_inode(inode);
		return retval;
	}
	jbegin_count += retval;

	reiserfs_write_lock(parent_dir->i_sb);
	item_len = ROUND_UP(strlen(symname));
	if (item_len > MAX_DIRECT_ITEM_LEN(parent_dir->i_sb->s_blocksize)) {
		retval = -ENAMETOOLONG;
		drop_new_inode(inode);
		goto out_failed;
	}

	name = kmalloc(item_len, GFP_NOFS);
	if (!name) {
		drop_new_inode(inode);
		retval = -ENOMEM;
		goto out_failed;
	}
	memcpy(name, symname, strlen(symname));
	padd_item(name, item_len, strlen(symname));

	retval = journal_begin(&th, parent_dir->i_sb, jbegin_count);
	if (retval) {
		drop_new_inode(inode);
		kfree(name);
		goto out_failed;
	}

	retval =
	    reiserfs_new_inode(&th, parent_dir, mode, name, strlen(symname),
			       dentry, inode, &security);
	kfree(name);
	if (retval) {		/* reiserfs_new_inode iputs for us */
		goto out_failed;
	}

	reiserfs_update_inode_transaction(inode);
	reiserfs_update_inode_transaction(parent_dir);

	inode->i_op = &reiserfs_symlink_inode_operations;
	inode->i_mapping->a_ops = &reiserfs_address_space_operations;

	// must be sure this inode is written with this transaction
	//
	//reiserfs_update_sd (&th, inode, READ_BLOCKS);

	retval = reiserfs_add_entry(&th, parent_dir, dentry->d_name.name,
				    dentry->d_name.len, inode, 1 /*visible */ );
	if (retval) {
		int err;
		drop_nlink(inode);
		reiserfs_update_sd(&th, inode);
		err = journal_end(&th, parent_dir->i_sb, jbegin_count);
		if (err)
			retval = err;
		unlock_new_inode(inode);
		iput(inode);
		goto out_failed;
	}

	unlock_new_inode(inode);
	d_instantiate(dentry, inode);
	retval = journal_end(&th, parent_dir->i_sb, jbegin_count);
      out_failed:
	reiserfs_write_unlock(parent_dir->i_sb);
	return retval;
}

//.........这里部分代码省略.........

  retval = -EPERM;
  if (new_inode && (new_dir->i_mode & S_ISVTX) && 
      current->fsuid != new_inode->i_uid &&
      current->fsuid != new_dir->i_uid && !fsuser())
    goto end_rename;

  if (S_ISDIR(old_inode->i_mode)) {
    /* old name points to directory */
    retval = -ENOTDIR;
    if (new_inode && !S_ISDIR(new_inode->i_mode))
      goto end_rename;

    retval = -EINVAL;
    if (is_subdir(new_dentry, old_dentry))
      goto end_rename;

    retval = -EIO;
    /* directory is renamed, its parent directory will be changed, so find ".." entry */
    dot_dot_de.de_gen_number_bit_string = 0;
    if (reiserfs_find_entry (old_inode, "..", 2, &dot_dot_entry_path, &dot_dot_de) == POSITION_NOT_FOUND)
      goto end_rename;
    if (dot_dot_de.de_objectid != old_dir->i_ino)
      goto end_rename;
    pathrelse (&dot_dot_entry_path);

    retval = -EMLINK;
    if (!new_inode && new_dir->i_nlink >= REISERFS_LINK_MAX)
      goto end_rename;
  }
  
  if (new_entry_added == 0) {
    /* add new entry if we did not do it, but do not mark it as visible */
    retval = reiserfs_add_entry (th, new_dir, new_dentry->d_name.name, new_dentry->d_name.len, INODE_PKEY (old_inode), &new_de, 0);
    if (retval)
      goto end_rename;
    if_in_ram_update_sd (th, new_dir);
    new_entry_added = 1;
    goto try_again;
  }


  /* 
   * look for old name, new name and ".." when renaming directories again
   */
  if (reiserfs_find_entry (old_dir, old_dentry->d_name.name, old_dentry->d_name.len, &old_entry_path, &old_de) == POSITION_NOT_FOUND)
    reiserfs_panic (old_dir->i_sb, "vs-7050: reiserfs_rename: old name not found");
  if (reiserfs_find_entry (new_dir, new_dentry->d_name.name, new_dentry->d_name.len, &new_entry_path, &new_de) == POSITION_NOT_FOUND)
    reiserfs_panic (old_dir->i_sb, "vs-7055: reiserfs_rename: new name not found");
  if (S_ISDIR(old_inode->i_mode) && reiserfs_find_entry (old_inode, "..", 2, &dot_dot_entry_path, &dot_dot_de) == POSITION_NOT_FOUND)
    reiserfs_panic (old_dir->i_sb, "vs-7060: reiserfs_rename: \"..\" name not found");
 

  /* sanity checking before doing the rename - avoid races */
  if (!entry_points_to_object (new_dentry->d_name.name, new_dentry->d_name.len, &new_de, new_inode))
    goto try_again;
  if (!entry_points_to_object (old_dentry->d_name.name, old_dentry->d_name.len, &old_de, old_inode))
    /* go to re-looking for old entry */
    goto try_again;

  if (S_ISDIR(old_inode->i_mode) && !entry_points_to_object ("..", 2, &dot_dot_de, old_dir))
    /* go to re-looking for ".." entry of renamed directory */
    goto try_again;
  
  /* ok, all the changes can be done in one fell swoop when we have
     claimed all the buffers needed.*/

int reiserfs_mkdir (struct inode * dir, struct dentry *dentry, int mode)
{
  int error;
  struct inode * inode;
  struct path path_to_entry;
  struct reiserfs_dir_entry de;
  int windex ;
  struct reiserfs_transaction_handle th ;
  int jbegin_count = JOURNAL_PER_BALANCE_CNT * 3; 
  int err;


  init_path (&path_to_entry);
  if (!dir || !dir->i_sb) {
    return -EINVAL;
  }
  inode = get_empty_inode() ;
  if (!inode) {
    return -ENOSPC ;
  }

  journal_begin(&th, dir->i_sb, jbegin_count) ;
  windex = push_journal_writer("reiserfs_mkdir") ;
  de.de_gen_number_bit_string = 0;
  if (reiserfs_find_entry (dir, dentry->d_name.name, dentry->d_name.len, &path_to_entry, &de) == POSITION_FOUND) {
    pathrelse (&path_to_entry);
    pop_journal_writer(windex) ;
    journal_end(&th, dir->i_sb, jbegin_count) ;
    iput(inode) ;
    return -EEXIST;
  }
  pathrelse (&path_to_entry);
  
  if (dir->i_nlink >= REISERFS_LINK_MAX) {
    pop_journal_writer(windex) ;
    journal_end(&th, dir->i_sb, jbegin_count) ;
    iput(inode) ;
    return -EMLINK;
  }
  
  mode = S_IFDIR | (mode & 0777 & ~current->fs->umask);
  if (dir->i_mode & S_ISGID)
    mode |= S_ISGID;
  inode = reiserfs_new_inode (&th, dir, mode, 0, dentry, inode, &err);
  if (!inode) {
    pop_journal_writer(windex) ;
    journal_end(&th, dir->i_sb, jbegin_count) ;
    return err;
  }
  reiserfs_update_inode_transaction(inode) ;
  reiserfs_update_inode_transaction(dir) ;

  inode->i_op = &reiserfs_dir_inode_operations;

  /* new inode and stat data are uptodate. Inode is clean. */
  error = reiserfs_add_entry (&th, dir, dentry->d_name.name, dentry->d_name.len, INODE_PKEY (inode), &de, 1);
  if (error) {
    inode->i_nlink = 0;
    if_in_ram_update_sd (&th, inode);
    pop_journal_writer(windex) ;
    journal_end(&th, dir->i_sb, jbegin_count) ;
    iput (inode);
    return error;
  }

  /* update dir inode, reiserfs_add_entry does not do that */
  dir->i_nlink ++;
  if_in_ram_update_sd (&th, dir);
  d_instantiate(dentry, inode);
  pop_journal_writer(windex) ;
  journal_end(&th, dir->i_sb, jbegin_count) ;
  return 0;
}

int reiserfs_mknod (struct inode * dir, struct dentry *dentry, int mode, int rdev)
{
  int error;
  struct inode * inode;
  struct path path_to_entry;
  struct reiserfs_dir_entry de;
  int windex ;
  struct reiserfs_transaction_handle th ;
  int jbegin_count = JOURNAL_PER_BALANCE_CNT * 3; 
  int err;

  if (!dir)
    return -ENOENT;

  init_path (&path_to_entry);

  inode = get_empty_inode() ;
  if (!inode) {
    return -ENOSPC ;
  }
  journal_begin(&th, dir->i_sb, jbegin_count) ;
  windex = push_journal_writer("reiserfs_mknod") ;
  de.de_gen_number_bit_string = 0;
  if (reiserfs_find_entry (dir, dentry->d_name.name, dentry->d_name.len, &path_to_entry, &de) == POSITION_FOUND) {
    pathrelse ( &path_to_entry);
    pop_journal_writer(windex) ;
    journal_end(&th, dir->i_sb, jbegin_count) ;
    iput(inode) ;
    return -EEXIST;
  }

  pathrelse ( &path_to_entry);

  inode = reiserfs_new_inode (&th, dir, mode, 0, dentry, inode, &err);
  if (!inode) {
    pop_journal_writer(windex) ;
    journal_end(&th, dir->i_sb, jbegin_count) ;
    return err;
  }
  reiserfs_update_inode_transaction(inode) ;
  reiserfs_update_inode_transaction(dir) ;

  inode->i_uid = current->fsuid;
  inode->i_mode = mode;
  inode->i_op = NULL;

  if (S_ISREG(inode->i_mode))
    inode->i_op = &reiserfs_file_inode_operations;
  else if (S_ISDIR(inode->i_mode)) {
    inode->i_op = &reiserfs_dir_inode_operations;
    if (dir->i_mode & S_ISGID)
      inode->i_mode |= S_ISGID;
  }
  else if (S_ISLNK(inode->i_mode))
    inode->i_op = &reiserfs_symlink_inode_operations;
  else if (S_ISCHR(inode->i_mode))
    inode->i_op = &chrdev_inode_operations;
  else if (S_ISBLK(inode->i_mode))
    inode->i_op = &blkdev_inode_operations;
  else if (S_ISFIFO(inode->i_mode))
    init_fifo(inode);
  if (S_ISBLK(mode) || S_ISCHR(mode))
    inode->i_rdev = to_kdev_t(rdev);

  if_in_ram_update_sd (&th, inode);

  error = reiserfs_add_entry (&th, dir, dentry->d_name.name, dentry->d_name.len, INODE_PKEY (inode), &de, 1);
  if (error) {
    inode->i_nlink--;
    if_in_ram_update_sd (&th, inode);
    pop_journal_writer(windex) ;
    journal_end(&th, dir->i_sb, jbegin_count) ;
    iput (inode);
    return error;
  }
  if_in_ram_update_sd (&th, dir);
  d_instantiate(dentry, inode);
  pop_journal_writer(windex) ;
  journal_end(&th, dir->i_sb, jbegin_count) ;
  return 0;
}

static int reiserfs_symlink (struct inode * parent_dir, 
                            struct dentry * dentry, const char * symname)
{
    int retval;
    struct inode * inode;
    char * name;
    int item_len;
    struct reiserfs_transaction_handle th ;
    int mode = S_IFLNK | S_IRWXUGO;
    int jbegin_count = JOURNAL_PER_BALANCE_CNT * 3; 

    if (!(inode = new_inode(parent_dir->i_sb))) {
	return -ENOMEM ;
    }
    retval = new_inode_init(inode, parent_dir, mode);
    if (retval) {
        return retval;
    }

    reiserfs_write_lock(parent_dir->i_sb);
    item_len = ROUND_UP (strlen (symname));
    if (item_len > MAX_DIRECT_ITEM_LEN (parent_dir->i_sb->s_blocksize)) {
	retval =  -ENAMETOOLONG;
	drop_new_inode(inode);
	goto out_failed;
    }
  
    name = reiserfs_kmalloc (item_len, GFP_NOFS, parent_dir->i_sb);
    if (!name) {
	drop_new_inode(inode);
	retval =  -ENOMEM;
	goto out_failed;
    }
    memcpy (name, symname, strlen (symname));
    padd_item (name, item_len, strlen (symname));

    /* We would inherit the default ACL here, but symlinks don't get ACLs */

    journal_begin(&th, parent_dir->i_sb, jbegin_count) ;

    retval = reiserfs_new_inode (&th, parent_dir, mode, name, strlen (symname), 
                                 dentry, inode);
    reiserfs_kfree (name, item_len, parent_dir->i_sb);
    if (retval) { /* reiserfs_new_inode iputs for us */
	goto out_failed;
    }

    reiserfs_update_inode_transaction(inode) ;
    reiserfs_update_inode_transaction(parent_dir) ;

    inode->i_op = &reiserfs_symlink_inode_operations;
    inode->i_mapping->a_ops = &reiserfs_address_space_operations;

    // must be sure this inode is written with this transaction
    //
    //reiserfs_update_sd (&th, inode, READ_BLOCKS);

    retval = reiserfs_add_entry (&th, parent_dir, dentry->d_name.name, 
                                 dentry->d_name.len, inode, 1/*visible*/);
    if (retval) {
	inode->i_nlink--;
	reiserfs_update_sd (&th, inode);
	journal_end(&th, parent_dir->i_sb, jbegin_count) ;
	iput (inode);
	goto out_failed;
    }

    d_instantiate(dentry, inode);
    journal_end(&th, parent_dir->i_sb, jbegin_count) ;
out_failed:
    reiserfs_write_unlock(parent_dir->i_sb);
    return retval;
}

static int reiserfs_mkdir (struct inode * dir, struct dentry *dentry, int mode)
{
    int retval;
    struct inode * inode;
    struct reiserfs_transaction_handle th ;
    int jbegin_count = JOURNAL_PER_BALANCE_CNT * 3; 
    int locked;

#ifdef DISPLACE_NEW_PACKING_LOCALITIES
    /* set flag that new packing locality created and new blocks for the content     * of that directory are not displaced yet */
    REISERFS_I(dir)->new_packing_locality = 1;
#endif
    mode = S_IFDIR | mode;
    if (!(inode = new_inode(dir->i_sb))) {
	return -ENOMEM ;
    }
    retval = new_inode_init(inode, dir, mode);
    if (retval)
        return retval;

    locked = reiserfs_cache_default_acl (dir);

    reiserfs_write_lock(dir->i_sb);
    if (locked)
        reiserfs_write_lock_xattrs (dir->i_sb);
    journal_begin(&th, dir->i_sb, jbegin_count) ;

    /* inc the link count now, so another writer doesn't overflow it while
    ** we sleep later on.
    */
    INC_DIR_INODE_NLINK(dir)

    retval = reiserfs_new_inode (&th, dir, mode, 0/*symlink*/,
				old_format_only (dir->i_sb) ? 
				EMPTY_DIR_SIZE_V1 : EMPTY_DIR_SIZE,
				dentry, inode);
    if (locked)
        reiserfs_write_unlock_xattrs (dir->i_sb);

    if (retval) {
	dir->i_nlink-- ;
	goto out_failed;
    }
    reiserfs_update_inode_transaction(inode) ;
    reiserfs_update_inode_transaction(dir) ;

    inode->i_op = &reiserfs_dir_inode_operations;
    inode->i_fop = &reiserfs_dir_operations;

    // note, _this_ add_entry will not update dir's stat data
    retval = reiserfs_add_entry (&th, dir, dentry->d_name.name, dentry->d_name.len, 
				inode, 1/*visible*/);
    if (retval) {
	inode->i_nlink = 0;
	DEC_DIR_INODE_NLINK(dir);
	reiserfs_update_sd (&th, inode);
	journal_end(&th, dir->i_sb, jbegin_count) ;
	iput (inode);
	goto out_failed;
    }

    // the above add_entry did not update dir's stat data
    reiserfs_update_sd (&th, dir);

    d_instantiate(dentry, inode);
    journal_end(&th, dir->i_sb, jbegin_count) ;
out_failed:
    reiserfs_write_unlock(dir->i_sb);
    return retval;
}

static int reiserfs_mknod (struct inode * dir, struct dentry *dentry, int mode, dev_t rdev)
{
    int retval;
    struct inode * inode;
    struct reiserfs_transaction_handle th ;
    int jbegin_count = JOURNAL_PER_BALANCE_CNT * 3; 
    int locked;

    if (!new_valid_dev(rdev))
	return -EINVAL;

    if (!(inode = new_inode(dir->i_sb))) {
	return -ENOMEM ;
    }
    retval = new_inode_init(inode, dir, mode);
    if (retval)
        return retval;

    locked = reiserfs_cache_default_acl (dir);

    reiserfs_write_lock(dir->i_sb);

    if (locked)
        reiserfs_write_lock_xattrs (dir->i_sb);

    journal_begin(&th, dir->i_sb, jbegin_count) ;

    retval = reiserfs_new_inode (&th, dir, mode, 0, 0/*i_size*/, dentry, inode);

    if (locked)
        reiserfs_write_unlock_xattrs (dir->i_sb);

    if (retval) {
        goto out_failed;
    }

    inode->i_op = &reiserfs_special_inode_operations;
    init_special_inode(inode, inode->i_mode, rdev) ;

    //FIXME: needed for block and char devices only
    reiserfs_update_sd (&th, inode);

    reiserfs_update_inode_transaction(inode) ;
    reiserfs_update_inode_transaction(dir) ;

    retval = reiserfs_add_entry (&th, dir, dentry->d_name.name, dentry->d_name.len, 
				 inode, 1/*visible*/);
    if (retval) {
	inode->i_nlink--;
	reiserfs_update_sd (&th, inode);
	journal_end(&th, dir->i_sb, jbegin_count) ;
	iput (inode);
	goto out_failed;
    }

    d_instantiate(dentry, inode);
    journal_end(&th, dir->i_sb, jbegin_count) ;

out_failed:
    reiserfs_write_unlock(dir->i_sb);
    return retval;
}

static int reiserfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
			  dev_t rdev)
{
	int retval;
	struct inode *inode;
	struct reiserfs_transaction_handle th;
	struct reiserfs_security_handle security;
	/* We need blocks for transaction + (user+group)*(quotas for new inode + update of quota for directory owner) */
	int jbegin_count =
	    JOURNAL_PER_BALANCE_CNT * 3 +
	    2 * (REISERFS_QUOTA_INIT_BLOCKS(dir->i_sb) +
		 REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb));

	if (!new_valid_dev(rdev))
		return -EINVAL;

	dquot_initialize(dir);

	if (!(inode = new_inode(dir->i_sb))) {
		return -ENOMEM;
	}
	new_inode_init(inode, dir, mode);

	jbegin_count += reiserfs_cache_default_acl(dir);
	retval = reiserfs_security_init(dir, inode, &dentry->d_name, &security);
	if (retval < 0) {
		drop_new_inode(inode);
		return retval;
	}
	jbegin_count += retval;
	reiserfs_write_lock(dir->i_sb);

	retval = journal_begin(&th, dir->i_sb, jbegin_count);
	if (retval) {
		drop_new_inode(inode);
		goto out_failed;
	}

	retval =
	    reiserfs_new_inode(&th, dir, mode, NULL, 0 /*i_size */ , dentry,
			       inode, &security);
	if (retval) {
		goto out_failed;
	}

	inode->i_op = &reiserfs_special_inode_operations;
	init_special_inode(inode, inode->i_mode, rdev);

	//FIXME: needed for block and char devices only
	reiserfs_update_sd(&th, inode);

	reiserfs_update_inode_transaction(inode);
	reiserfs_update_inode_transaction(dir);

	retval =
	    reiserfs_add_entry(&th, dir, dentry->d_name.name,
			       dentry->d_name.len, inode, 1 /*visible */ );
	if (retval) {
		int err;
		drop_nlink(inode);
		reiserfs_update_sd(&th, inode);
		err = journal_end(&th, dir->i_sb, jbegin_count);
		if (err)
			retval = err;
		unlock_new_inode(inode);
		iput(inode);
		goto out_failed;
	}

	unlock_new_inode(inode);
	d_instantiate(dentry, inode);
	retval = journal_end(&th, dir->i_sb, jbegin_count);

      out_failed:
	reiserfs_write_unlock(dir->i_sb);
	return retval;
}