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incubator-nuttx/fs/vfs/fs_rename.c

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/****************************************************************************
* fs/vfs/fs_rename.c
*
* Copyright (C) 2007-2009, 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdio.h>
#include <errno.h>
#include <nuttx/fs/fs.h>
#include "inode/inode.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#undef FS_HAVE_WRITABLE_MOUNTPOINT
#if !defined(CONFIG_DISABLE_MOUNTPOINT) && defined(CONFIG_FS_WRITABLE) && \
CONFIG_NFILE_STREAMS > 0
# define FS_HAVE_WRITABLE_MOUNTPOINT 1
#endif
#undef FS_HAVE_PSEUDOFS_OPERATIONS
#if !defined(CONFIG_DISABLE_PSEUDOFS_OPERATIONS) && CONFIG_NFILE_STREAMS > 0
# define FS_HAVE_PSEUDOFS_OPERATIONS 1
#endif
#undef FS_HAVE_RENAME
#if defined(FS_HAVE_WRITABLE_MOUNTPOINT) || defined(FS_HAVE_PSEUDOFS_OPERATIONS)
# define FS_HAVE_RENAME 1
#endif
#ifdef FS_HAVE_RENAME
/****************************************************************************
* Private Variables
****************************************************************************/
/****************************************************************************
* Public Variables
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: rename
*
* Description: Remove a file managed a mountpoint
*
****************************************************************************/
int rename(FAR const char *oldpath, FAR const char *newpath)
{
FAR struct inode *oldinode;
FAR struct inode *newinode;
const char *oldrelpath = NULL;
#ifndef CONFIG_DISABLE_MOUNTPOINT
const char *newrelpath = NULL;
#endif
int errcode;
int ret;
/* Ignore paths that are interpreted as the root directory which has no name
* and cannot be moved
*/
if (!oldpath || *oldpath == '\0' || oldpath[0] != '/' ||
!newpath || *newpath == '\0' || newpath[0] != '/')
{
return -EINVAL;
}
/* Get an inode that includes the oldpath */
oldinode = inode_find(oldpath, &oldrelpath);
if (!oldinode)
{
/* There is no inode that includes in this path */
errcode = ENOENT;
goto errout;
}
#ifndef CONFIG_DISABLE_MOUNTPOINT
/* Verify that the old inode is a valid mountpoint. */
if (INODE_IS_MOUNTPT(oldinode) && oldinode->u.i_mops)
{
/* Get an inode for the new relpath -- it should like on the same
* mountpoint
*/
newinode = inode_find(newpath, &newrelpath);
if (!newinode)
{
/* There is no mountpoint that includes in this path */
errcode = ENOENT;
goto errout_with_oldinode;
}
/* Verify that the two paths lie on the same mountpoint inode */
if (oldinode != newinode)
{
errcode = EXDEV;
goto errout_with_newinode;
}
/* Perform the rename operation using the relative paths
* at the common mountpoint.
*/
if (oldinode->u.i_mops->rename)
{
ret = oldinode->u.i_mops->rename(oldinode, oldrelpath, newrelpath);
if (ret < 0)
{
errcode = -ret;
goto errout_with_newinode;
}
}
else
{
errcode = ENOSYS;
goto errout_with_newinode;
}
/* Successfully renamed */
inode_release(newinode);
}
else
#endif
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
{
/* Create a new, empty inode at the destination location */
inode_semtake();
ret = inode_reserve(newpath, &newinode);
if (ret < 0)
{
/* It is an error if a node at newpath already exists in the tree
* OR if we fail to allocate memory for the new inode (and possibly
* any new intermediate path segments).
*/
inode_semgive();
errcode = EEXIST;
goto errout_with_oldinode;
}
/* Copy the inode state from the old inode to the newly allocated inode */
newinode->i_child = oldinode->i_child; /* Link to lower level inode */
newinode->i_flags = oldinode->i_flags; /* Flags for inode */
newinode->u.i_ops = oldinode->u.i_ops; /* Inode operations */
#ifdef CONFIG_FILE_MODE
newinode->i_mode = oldinode->i_mode; /* Access mode flags */
#endif
newinode->i_private = oldinode->i_private; /* Per inode driver private data */
/* We now have two copies of the inode. One with a reference count of
* zero (the new one), and one that may have multiple references
* including one by this logic (the old one)
*
* Remove the old inode. Because we hold a reference count on the
* inode, it will not be deleted now. It will be deleted when all of
* the references to to the inode have been released (perhaps when
* inode_release() is called below). inode_remove() should return
* -EBUSY to indicate that the inode was not deleted now.
*/
ret = inode_remove(oldpath);
if (ret < 0 && ret != -EBUSY)
{
/* Remove the new node we just recreated */
(void)inode_remove(newpath);
inode_semgive();
errcode = -ret;
goto errout_with_oldinode;
}
/* Remove all of the children from the unlinked inode */
oldinode->i_child = NULL;
inode_semgive();
}
#else
{
errcode = ENXIO;
goto errout;
}
#endif
/* Successfully renamed */
inode_release(oldinode);
return OK;
#ifndef CONFIG_DISABLE_MOUNTPOINT
errout_with_newinode:
inode_release(newinode);
#endif
errout_with_oldinode:
inode_release(oldinode);
errout:
set_errno(errcode);
return ERROR;
}
#endif /* FS_HAVE_RENAME */
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