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incubator-nuttx/fs/vfs/fs_unlink.c

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/****************************************************************************
* fs/vfs/fs_unlink.c
*
* Copyright (C) 2007-2009, 2017 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 <stdbool.h>
#include <unistd.h>
#include <assert.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_UNLINK
#if defined(FS_HAVE_WRITABLE_MOUNTPOINT) || defined(FS_HAVE_PSEUDOFS_OPERATIONS)
# define FS_HAVE_UNLINK 1
#endif
#ifdef FS_HAVE_UNLINK
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: unlink
*
* Description: Remove a file managed a mountpoint
*
****************************************************************************/
int unlink(FAR const char *pathname)
{
struct inode_search_s desc;
FAR struct inode *inode;
int errcode;
int ret;
/* Get an inode for this file (without deference the final node in the path
* which may be a symbolic link)
*/
SETUP_SEARCH(&desc, pathname, true);
ret = inode_find(&desc);
if (ret < 0)
{
/* There is no inode that includes in this path */
errcode = -ret;
goto errout_with_search;
}
/* Get the search results */
inode = desc.node;
DEBUGASSERT(inode != NULL);
#ifndef CONFIG_DISABLE_MOUNTPOINT
/* Check if the inode is a valid mountpoint. */
if (INODE_IS_MOUNTPT(inode) && inode->u.i_mops)
{
/* Perform the unlink operation using the relative path at the
* mountpoint.
*/
if (inode->u.i_mops->unlink)
{
ret = inode->u.i_mops->unlink(inode, desc.relpath);
if (ret < 0)
{
errcode = -ret;
goto errout_with_inode;
}
}
else
{
errcode = ENOSYS;
goto errout_with_inode;
}
}
else
#endif
#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
/* If this is a "dangling" pseudo-file node (i.e., it has no operations)
* or a soft link, then rm should remove the node.
*/
#ifdef CONFIG_PSEUDOFS_SOFTLINKS
/* A soft link is the only "specal" file that we can remove via unlink(). */
if (!INODE_IS_SPECIAL(inode) || INODE_IS_SOFTLINK(inode))
#else
if (!INODE_IS_SPECIAL(inode))
#endif
{
/* If this is a pseudo-file node (i.e., it has no operations)
* then unlink should remove the node.
*/
if (inode->u.i_ops != NULL)
{
inode_semtake();
/* Refuse to unlink the inode if it has children. I.e., if it is
* functioning as a directory and the directory is not empty.
*/
if (inode->i_child != NULL)
{
errcode = ENOTEMPTY;
inode_semgive();
goto errout_with_inode;
}
/* Notify the driver that it has been unlinked. If there are no
* open references to the driver instance, then the driver should
* release all resources because it is no longer accessible.
*/
if (INODE_IS_DRIVER(inode) && inode->u.i_ops->unlink)
{
/* Notify the character driver that it has been unlinked */
ret = inode->u.i_ops->unlink(inode);
if (ret < 0)
{
errcode = -ret;
goto errout_with_inode;
}
}
#ifndef CONFIG_DISABLE_MOUNTPOINT
else if (INODE_IS_BLOCK(inode) && inode->u.i_bops->unlink)
{
/* Notify the block driver that it has been unlinked */
ret = inode->u.i_bops->unlink(inode);
if (ret < 0)
{
errcode = -ret;
goto errout_with_inode;
}
}
#endif
/* 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 the inode have been released (perhaps
* when inode_release() is called below). inode_remove() will
* return -EBUSY to indicate that the inode was not deleted now.
*/
ret = inode_remove(pathname);
inode_semgive();
if (ret < 0 && ret != -EBUSY)
{
errcode = -ret;
goto errout_with_inode;
}
}
else
{
errcode = EISDIR;
goto errout_with_inode;
}
}
else
#endif
{
errcode = ENXIO;
goto errout_with_inode;
}
/* Successfully unlinked */
inode_release(inode);
RELEASE_SEARCH(&desc);
return OK;
errout_with_inode:
inode_release(inode);
errout_with_search:
RELEASE_SEARCH(&desc);
set_errno(errcode);
return ERROR;
}
#endif /* FS_HAVE_UNLINK */
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