nuttx/fs/driver/driver.h

/****************************************************************************
 * fs/driver/driver.h
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 ****************************************************************************/

#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: register_partition_with_inode
 *
 * Description:
 *   Register a block partition driver inode the pseudo file system.
 *
 * Input Parameters:
 *   partition   - The path to the partition inode
 *   parent      - the parent inode
 *   firstsector - The offset in sectors to the partition
 *   nsectors    - The number of sectors in the partition
 *
 * Returned Value:
 *   Zero on success (with the inode point in 'inode'); A negated errno
 *   value is returned on a failure (all error values returned by
 *   inode_reserve):
 *
 *   EINVAL - 'path' is invalid for this operation
 *   EEXIST - An inode already exists at 'path'
 *   ENOMEM - Failed to allocate in-memory resources for the operation
 *
 ****************************************************************************/

#ifndef CONFIG_DISABLE_MOUNTPOINT
int register_partition_with_inode(FAR const char *partition,
                                  mode_t mode, FAR struct inode *parent,
                                  off_t firstsector, off_t nsectors);
#endif

/****************************************************************************
 * Name: block_proxy
 *
 * Description:
 *   Create a temporary char driver using drivers/bch to mediate character
 *   oriented accessed to the block driver.
 *
 * Input Parameters:
 *   filep  - The caller provided location in which to return the 'struct
 *            file' instance.
 *   blkdev - The path to the block driver
 *   oflags - Character driver open flags
 *
 * Returned Value:
 *   Zero (OK) is returned on success.  On failure, a negated errno value is
 *   returned.
 *
 ****************************************************************************/

#ifndef CONFIG_DISABLE_MOUNTPOINT
int block_proxy(FAR struct file *filep, FAR const char *blkdev, int oflags);
#endif

/****************************************************************************
 * Name: register_partition_with_mtd
 *
 * Description:
 *   Register a mtd partition driver inode the pseudo file system.
 *
 * Input Parameters:
 *   partition  - The path to the partition inode
 *   parent     - The parent mtd instance
 *   firstblock - The offset in block to the partition
 *   nblocks    - The number of block in the partition
 *
 * Returned Value:
 *   Zero on success (with the inode point in 'inode'); A negated errno
 *   value is returned on a failure (all error values returned by
 *   inode_reserve):
 *
 *   EINVAL - 'path' is invalid for this operation
 *   EEXIST - An inode already exists at 'path'
 *   ENOMEM - Failed to allocate in-memory resources for the operation
 *
 ****************************************************************************/

#ifdef CONFIG_MTD
int register_partition_with_mtd(FAR const char *partition,
                                mode_t mode, FAR struct mtd_dev_s *parent,
                                off_t firstblock, off_t nblocks);
#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. A negated errno value is returned on
 *   any failure.
 *
 ****************************************************************************/

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

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

#endif /* __FS_DRIVER_DRIVER_H */