diff options
author | px4dev <px4@purgatory.org> | 2012-08-04 15:12:36 -0700 |
---|---|---|
committer | px4dev <px4@purgatory.org> | 2012-08-04 15:12:36 -0700 |
commit | 8a365179eafdf3aea98e60ab9f5882b200d4c759 (patch) | |
tree | 4f38d6d4cd80bd0b6e22e2bb534c3f117ce44e56 /nuttx/fs/fs_inoderemove.c | |
download | px4-firmware-8a365179eafdf3aea98e60ab9f5882b200d4c759.tar.gz px4-firmware-8a365179eafdf3aea98e60ab9f5882b200d4c759.tar.bz2 px4-firmware-8a365179eafdf3aea98e60ab9f5882b200d4c759.zip |
Fresh import of the PX4 firmware sources.
Diffstat (limited to 'nuttx/fs/fs_inoderemove.c')
-rw-r--r-- | nuttx/fs/fs_inoderemove.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/nuttx/fs/fs_inoderemove.c b/nuttx/fs/fs_inoderemove.c new file mode 100644 index 000000000..c349b1759 --- /dev/null +++ b/nuttx/fs/fs_inoderemove.c @@ -0,0 +1,161 @@ +/**************************************************************************** + * fs/fs_inoderemove.c + * + * Copyright (C) 2007-2009 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 "fs_internal.h" + +/**************************************************************************** + * Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Variables + ****************************************************************************/ + +/**************************************************************************** + * Public Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: inode_unlink + ****************************************************************************/ + +static void inode_unlink(struct inode *node, + struct inode *peer, + struct inode *parent) +{ + /* If peer is non-null, then remove the node from the right of + * of that peer node. + */ + + if (peer) + { + peer->i_peer = node->i_peer; + } + + /* If parent is non-null, then remove the node from head of + * of the list of children. + */ + + else if (parent) + { + parent->i_child = node->i_peer; + } + + /* Otherwise, we must be removing the root inode. */ + + else + { + root_inode = node->i_peer; + } + + node->i_peer = NULL; +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: inode_remove + * + * Description: + * Remove a node from the in-memory, inode tree + * + * NOTE: Caller must hold the inode semaphore + * + ****************************************************************************/ + +int inode_remove(FAR const char *path) +{ + const char *name = path; + FAR struct inode *node; + FAR struct inode *left; + FAR struct inode *parent; + + if (!*path || path[0] != '/') + { + return -EINVAL; + } + + /* Find the node to delete */ + + node = inode_search(&name, &left, &parent, (const char **)NULL); + if (node) + { + /* Found it, now remove it from the tree */ + + inode_unlink(node, left, parent); + + /* We cannot delete it if there reference to the inode */ + + if (node->i_crefs) + { + /* In that case, we will mark it deleted, when the FS + * 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 */ + + inode_free(node->i_child); + kfree(node); + return OK; + } + } + + /* The node does not exist or it has references */ + + return -ENOENT; +} |