/* * This file is part of UBIFS.
*
* Copyright (C) 2006-2008 Nokia Corporation.
* Copyright (C) 2006, 2007 University of Szeged, Hungary
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors: Artem Bityutskiy (Битюцкий Артём)
* Adrian Hunter
* Zoltan Sogor
*/
/*
* This file implements directory operations.
*
* All FS operations in this file allocate budget before writing anything to the
* media. If they fail to allocate it, the error is returned. The only
* exceptions are 'ubifs_unlink()' and 'ubifs_rmdir()' which keep working even
* if they unable to allocate the budget, because deletion %-ENOSPC failure is
* not what users are usually ready to get. UBIFS budgeting subsystem has some
* space reserved for these purposes.
*
* All operations in this file write all inodes which they change straight
* away, instead of marking them dirty. For example, 'ubifs_link()' changes
* @i_size of the parent inode and writes the parent inode together with the
* target inode. This was done to simplify file-system recovery which would
* otherwise be very difficult to do. The only exception is rename which marks
* the re-named inode dirty (because its @i_ctime is updated) but does not
* write it, but just marks it as dirty.
*/
#include "ubifs.h"
/**
* inherit_flags - inherit flags of the parent inode.
* @dir: parent inode
* @mode: new inode mode flags
*
* This is a helper function for 'ubifs_new_inode()' which inherits flag of the
* parent directory inode @dir. UBIFS inodes inherit the following flags:
* o %UBIFS_COMPR_FL, which is useful to switch compression on/of on
* sub-directory basis;
* o %UBIFS_SYNC_FL - useful for the same reasons;
* o %UBIFS_DIRSYNC_FL - similar, but relevant only to directories.
*
* This function returns the inherited flags.
*/
static int inherit_flags(const struct inode *dir, umode_t mode)
{
int flags;
const struct ubifs_inode *ui = ubifs_inode(dir);
if (!S_ISDIR(dir->i_mode))
/*
* The parent is not a directory, which means that an extended
* attribute inode is being created. No flags.
*/
return 0;
flags = ui->flags &