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/****************************************************************************
* fs/nxffs/nxffs_dirent.c
*
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* References: Linux/Documentation/filesystems/romfs.txt
*
* 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 <string.h>
#include <dirent.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/fs/fs.h>
#include <nuttx/mtd/mtd.h>
#include <nuttx/fs/dirent.h>
#include "nxffs.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Public Types
****************************************************************************/
/****************************************************************************
* Public Variables
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nxffs_opendir
*
* Description:
* Open a directory for read access
*
****************************************************************************/
int nxffs_opendir(FAR struct inode *mountpt, FAR const char *relpath,
FAR struct fs_dirent_s *dir)
{
struct nxffs_volume_s *volume;
int ret;
fvdbg("relpath: \"%s\"\n", relpath ? relpath : "NULL");
/* Sanity checks */
DEBUGASSERT(mountpt != NULL && mountpt->i_private != NULL);
/* Recover the file system state from the NuttX inode instance */
volume = mountpt->i_private;
ret = sem_wait(&volume->exclsem);
if (ret != OK)
{
goto errout;
}
/* The requested directory must be the volume-relative "root" directory */
if (relpath && relpath[0] != '\0')
{
ret = -ENOENT;
goto errout_with_semaphore;
}
/* Set the offset to the offset to the first valid inode */
dir->u.nxffs.nx_offset = volume->inoffset;
ret = OK;
errout_with_semaphore:
sem_post(&volume->exclsem);
errout:
return ret;
}
/****************************************************************************
* Name: nxffs_readdir
*
* Description: Read the next directory entry
*
****************************************************************************/
int nxffs_readdir(FAR struct inode *mountpt, FAR struct fs_dirent_s *dir)
{
FAR struct nxffs_volume_s *volume;
FAR struct nxffs_entry_s entry;
off_t offset;
int ret;
/* Sanity checks */
DEBUGASSERT(mountpt != NULL && mountpt->i_private != NULL);
/* Recover the file system state from the NuttX inode instance */
volume = mountpt->i_private;
ret = sem_wait(&volume->exclsem);
if (ret != OK)
{
goto errout;
}
/* Read the next inode header from the offset */
offset = dir->u.nxffs.nx_offset;
ret = nxffs_nextentry(volume, offset, &entry);
/* If the read was successful, then handle the reported inode. Note
* that when the last inode has been reported, the value -ENOENT will
* be returned.. which is correct for the readdir() method.
*/
if (ret == OK)
{
/* Return the filename and file type */
fvdbg("Offset %d: \"%s\"\n", entry.hoffset, entry.name);
dir->fd_dir.d_type = DTYPE_FILE;
strncpy(dir->fd_dir.d_name, entry.name, NAME_MAX+1);
/* Discard this entry and set the next offset. */
dir->u.nxffs.nx_offset = nxffs_inodeend(volume, &entry);
nxffs_freeentry(&entry);
ret = OK;
}
sem_post(&volume->exclsem);
errout:
return ret;
}
/****************************************************************************
* Name: nxffs_rewindir
*
* Description:
* Reset directory read to the first entry
*
****************************************************************************/
int nxffs_rewinddir(FAR struct inode *mountpt, FAR struct fs_dirent_s *dir)
{
FAR struct nxffs_volume_s *volume;
int ret;
fvdbg("Entry\n");
/* Sanity checks */
DEBUGASSERT(mountpt != NULL && mountpt->i_private != NULL);
/* Recover the file system state from the NuttX inode instance */
volume = mountpt->i_private;
ret = sem_wait(&volume->exclsem);
if (ret != OK)
{
goto errout;
}
/* Reset the offset to the FLASH offset to the first valid inode */
dir->u.nxffs.nx_offset = volume->inoffset;
ret = OK;
sem_post(&volume->exclsem);
errout:
return ret;
}
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