incubator-nuttx/fs/driver/driver.h

/****************************************************************************
 * fs/driver/driver.h
 *
 *   Copyright (C) 2007, 2009, 2012, 2014, 2018 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.
 *
 ****************************************************************************/

#ifndef __FS_DRIVER_DRIVER_H
#define __FS_DRIVER_DRIVER_H

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>
#include <nuttx/compiler.h>
#include <nuttx/fs/fs.h>

#include "inode/inode.h"

/****************************************************************************
 * Public Data
 ****************************************************************************/

#undef EXTERN
#if defined(__cplusplus)
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif

/****************************************************************************
 * Public Function Prototypes
 ****************************************************************************/

/****************************************************************************
 * Name: find_blockdriver
 *
 * Description:
 *   Return the inode of the block driver specified by 'pathname'
 *
 * Input Parameters:
 *   pathname   - The full path to the block driver to be located
 *   mountflags - If MS_RDONLY is not set, then driver must support write
 *                operations (see include/sys/mount.h)
 *   ppinode    - Address of the location to return the inode reference
 *
 * Returned Value:
 *   Returns zero on success or a negated errno on failure:
 *
 *   ENOENT  - No block driver of this name is registered
 *   ENOTBLK - The inode associated with the pathname is not a block driver
 *   EACCESS - The MS_RDONLY option was not set but this driver does not
 *             support write access
 *
 ****************************************************************************/

#ifndef CONFIG_DISABLE_MOUNTPOINT
int find_blockdriver(FAR const char *pathname, int mountflags,
                     FAR struct inode **ppinode);
#endif

/****************************************************************************
 * Name: block_proxy
 *
 * Description:
 *   Create a temporary char driver using drivers/bch to mediate character
 *   oriented accessed to the block driver.
 *
 * Input Parameters:
 *   blkdev - The path to the block driver
 *   oflags - Character driver open flags
 *
 * Returned Value:
 *   If positive, non-zero file descriptor is returned on success.  This
 *   is the file descriptor of the nameless character driver that mediates
 *   accesses to the block driver.
 *
 *   Errors that may be returned:
 *
 *     ENOMEM - Failed to create a temporary path name.
 *
 *   Plus:
 *
 *     - Errors reported from bchdev_register()
 *     - Errors reported from open() or unlink()
 *
 ****************************************************************************/

#if !defined(CONFIG_DISABLE_MOUNTPOINT)
int block_proxy(FAR const char *blkdev, int oflags);
#endif

/****************************************************************************
 * Name: mtd_proxy
 *
 * Description:
 *   Create a temporary block driver using drivers/mtd/ftl to mediate block
 *   oriented accessed to the mtd driver.
 *
 * Input Parameters:
 *   mtddev  - The path to the mtd driver
 *   mountflags - if MS_RDONLY is not set, then driver must support write
 *     operations (see include/sys/mount.h)
 *   ppinode - address of the location to return the inode reference
 *
 * Returned Value:
 *   If zero, non-zero inode pointer is returned on success.  This
 *   is the inode pointer of the nameless block driver that mediates
 *   accesses to the mtd driver.
 *
 *   Errors that may be returned:
 *
 *     ENOMEM - Failed to create a temporary path name.
 *
 *   Plus:
 *
 *     - Errors reported from ftl_initialize()
 *     - Errors reported from open() or unlink()
 *
 ****************************************************************************/

#ifdef CONFIG_MTD
int mtd_proxy(FAR const char *mtddev, int mountflags,
              FAR struct inode **ppinode);
#endif

/****************************************************************************
 * Name: find_mtddriver
 *
 * Description:
 *   Return the inode of the named MTD driver specified by 'pathname'
 *
 * Input Parameters:
 *   pathname   - the full path to the named MTD driver to be located
 *   ppinode    - address of the location to return the inode reference
 *
 * Returned Value:
 *   Returns zero on success or a negated errno on failure:
 *
 *   ENOENT  - No MTD driver of this name is registered
 *   ENOTBLK - The inode associated with the pathname is not an MTD driver
 *
 ****************************************************************************/

#if defined(CONFIG_MTD) && !defined(CONFIG_DISABLE_MOUNTPOINT)
int find_mtddriver(FAR const char *pathname, FAR struct inode **ppinode);
#endif

#undef EXTERN
#if defined(__cplusplus)
}
#endif

#endif /* __FS_DRIVER_DRIVER_H */