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146 lines
4.5 KiB
146 lines
4.5 KiB
/**************************************************************************** |
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* fs/fs_rewinddir.c |
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* |
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* Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr> |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* 3. Neither the name NuttX nor the names of its contributors may be |
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* used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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****************************************************************************/ |
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/**************************************************************************** |
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* Included Files |
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****************************************************************************/ |
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#include <nuttx/config.h> |
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#include <dirent.h> |
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#include <errno.h> |
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#include <nuttx/fs/fs.h> |
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#include <nuttx/fs/dirent.h> |
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#include "fs_internal.h" |
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/**************************************************************************** |
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* Private Functions |
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****************************************************************************/ |
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/**************************************************************************** |
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* Name: rewindpsuedodir |
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****************************************************************************/ |
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static inline void rewindpsuedodir(struct fs_dirent_s *idir) |
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{ |
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struct inode *prev; |
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inode_semtake(); |
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/* Reset the position to the beginning */ |
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prev = idir->u.psuedo.fd_next; /* (Save to delete later) */ |
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idir->u.psuedo.fd_next = idir->fd_root; /* The next node to visit */ |
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idir->fd_position = 0; /* Reset position */ |
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/* Increment the reference count on the root=next node. We |
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* should now have two references on the inode. |
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*/ |
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idir->fd_root->i_crefs++; |
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inode_semgive(); |
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/* Then release the reference to the old next inode */ |
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if (prev) |
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{ |
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inode_release(prev); |
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} |
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} |
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/**************************************************************************** |
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* Public Functions |
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****************************************************************************/ |
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/**************************************************************************** |
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* Name: rewinddir |
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* |
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* Description: |
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* The rewinddir() function resets the position of the |
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* directory stream dir to the beginning of the directory. |
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* |
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* Inputs: |
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* dirp -- An instance of type DIR created by a previous |
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* call to opendir(); |
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* |
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* Return: |
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* None |
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* |
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****************************************************************************/ |
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void rewinddir(FAR DIR *dirp) |
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{ |
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struct fs_dirent_s *idir = (struct fs_dirent_s *)dirp; |
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#ifndef CONFIG_DISABLE_MOUNTPOINT |
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struct inode *inode; |
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#endif |
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/* Sanity checks */ |
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if (!idir || !idir->fd_root) |
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{ |
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return; |
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} |
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/* The way we handle the readdir depends on the type of inode |
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* that we are dealing with. |
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*/ |
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#ifndef CONFIG_DISABLE_MOUNTPOINT |
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inode = idir->fd_root; |
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if (INODE_IS_MOUNTPT(inode)) |
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{ |
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/* The node is a file system mointpoint. Verify that the mountpoint |
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* supports the rewinddir() method |
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*/ |
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if (inode->u.i_mops && inode->u.i_mops->rewinddir) |
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{ |
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/* Perform the rewinddir() operation */ |
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inode->u.i_mops->rewinddir(inode, idir); |
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} |
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} |
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else |
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#endif |
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{ |
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/* The node is part of the root psuedo file system */ |
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rewindpsuedodir(idir); |
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} |
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} |
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