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- /****************************************************************************
- * fs/inode/fs_inoderemove.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 <errno.h>
- #include <nuttx/kmalloc.h>
- #include <nuttx/fs/fs.h>
- #include "inode/inode.h"
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: inode_unlink
- *
- * Description:
- * Given a path, remove a the node from the in-memory, inode tree that the
- * path refers to. This is normally done in preparation to removing or
- * moving an inode.
- *
- * In symbolic links in the pseduo file system are enabled, then this
- * logic will follow the symbolic links up until the terminal node. Then
- * that link in removed. So if this the terminal node is a symbolic link,
- * the symbolic link node will be removed, not the target of the link.
- *
- * Assumptions/Limitations:
- * The caller must hold the inode semaphore
- *
- ****************************************************************************/
- FAR struct inode *inode_unlink(FAR const char *path)
- {
- struct inode_search_s desc;
- FAR struct inode *node = NULL;
- int ret;
- /* Verify parameters. Ignore null paths */
- if (path == NULL)
- {
- return NULL;
- }
- /* Find the node to unlink */
- SETUP_SEARCH(&desc, path, true);
- ret = inode_search(&desc);
- if (ret >= 0)
- {
- node = desc.node;
- DEBUGASSERT(node != NULL);
- /* If peer is non-null, then remove the node from the right of
- * of that peer node.
- */
- if (desc.peer != NULL)
- {
- desc.peer->i_peer = node->i_peer;
- }
- /* Then remove the node from head of the list of children. */
- else
- {
- DEBUGASSERT(desc.parent != NULL);
- desc.parent->i_child = node->i_peer;
- }
- node->i_peer = NULL;
- }
- RELEASE_SEARCH(&desc);
- return node;
- }
- /****************************************************************************
- * Name: inode_remove
- *
- * Description:
- * Given a path, remove a the node from the in-memory, inode tree that the
- * path refers to and free all resources related to the inode. If the
- * inode is in-use, then it will be unlinked, but will not be freed until
- * the last reference to the inode is released.
- *
- * Assumptions/Limitations:
- * The caller must hold the inode semaphore
- *
- ****************************************************************************/
- int inode_remove(FAR const char *path)
- {
- FAR struct inode *node;
- /* Find the inode and unlink it from the in-memory inode tree */
- node = inode_unlink(path);
- if (node)
- {
- /* Found it! But we cannot delete the inode if there are references
- * to it
- */
- if (node->i_crefs)
- {
- /* In that case, we will mark it deleted, when the filesystem
- * releases the inode, we will then, finally delete the subtree
- */
- node->i_flags |= FSNODEFLAG_DELETED;
- return -EBUSY;
- }
- else
- {
- /* And delete it now -- recursively to delete all of its children.
- * Since it has been unlinked, then the peer pointer should be
- * NULL.
- */
- DEBUGASSERT(node->i_peer == NULL);
- inode_free(node);
- return OK;
- }
- }
- /* The node does not exist */
- return -ENOENT;
- }
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