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/**
* @file
*
* @brief RTEMS RFS Device Interface
* @ingroup rtems_rfs
*
* This file contains the set of handlers used to map operations on RFS device
* nodes onto calls to the RTEMS Classic API IO Manager.
*/
/*
* COPYRIGHT (c) 2010 Chris Johns <chrisj@rtems.org>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include "rtems-rfs-rtems.h"
#include <rtems/deviceio.h>
static void
rtems_rfs_rtems_device_get_major_and_minor ( const rtems_libio_t *iop,
rtems_device_major_number *major,
rtems_device_minor_number *minor)
{
*major = iop->data0;
*minor = (rtems_device_minor_number) iop->data1;
}
/**
* This handler maps an open() operation onto rtems_io_open().
*
* @param iop
* @param pathname
* @param flag
* @param mode
* @return int
*/
static int
rtems_rfs_rtems_device_open ( rtems_libio_t *iop,
const char *pathname,
int oflag,
mode_t mode)
{
rtems_rfs_file_system* fs = rtems_rfs_rtems_pathloc_dev (&iop->pathinfo);
rtems_rfs_ino ino = rtems_rfs_rtems_get_iop_ino (iop);
rtems_rfs_inode_handle inode;
rtems_device_major_number major;
rtems_device_minor_number minor;
int rc;
rtems_rfs_rtems_lock (fs);
rc = rtems_rfs_inode_open (fs, ino, &inode, true);
if (rc > 0)
{
rtems_rfs_rtems_unlock (fs);
return rtems_rfs_rtems_error ("device_open: opening inode", rc);
}
major = rtems_rfs_inode_get_block (&inode, 0);
minor = rtems_rfs_inode_get_block (&inode, 1);
rc = rtems_rfs_inode_close (fs, &inode);
if (rc > 0)
{
rtems_rfs_rtems_unlock (fs);
return rtems_rfs_rtems_error ("device_open: closing inode", rc);
}
rtems_rfs_rtems_unlock (fs);
iop->data0 = major;
iop->data1 = (void *) minor;
return rtems_deviceio_open (iop, pathname, oflag, mode, minor, major);
}
/**
* This handler maps a close() operation onto rtems_io_close().
*
* @param iop
* @return int
*/
static int
rtems_rfs_rtems_device_close (rtems_libio_t* iop)
{
rtems_device_major_number major;
rtems_device_minor_number minor;
rtems_rfs_rtems_device_get_major_and_minor (iop, &major, &minor);
return rtems_deviceio_close (iop, major, minor);
}
/**
* This handler maps a read() operation onto rtems_io_read().
*
* @param iop
* @param buffer
* @param count
* @return ssize_t
*/
static ssize_t
rtems_rfs_rtems_device_read (rtems_libio_t* iop, void* buffer, size_t count)
{
rtems_device_major_number major;
rtems_device_minor_number minor;
rtems_rfs_rtems_device_get_major_and_minor (iop, &major, &minor);
return rtems_deviceio_read (iop, buffer, count, major, minor);
}
/*
* This handler maps a write() operation onto rtems_io_write().
*
* @param iop
* @param buffer
* @param count
* @return ssize_t
*/
static ssize_t
rtems_rfs_rtems_device_write (rtems_libio_t* iop,
const void* buffer,
size_t count)
{
rtems_device_major_number major;
rtems_device_minor_number minor;
rtems_rfs_rtems_device_get_major_and_minor (iop, &major, &minor);
return rtems_deviceio_write (iop, buffer, count, major, minor);
}
/**
* This handler maps an ioctl() operation onto rtems_io_ioctl().
*
* @param iop
* @param command
* @param buffer
* @return int
*/
static int
rtems_rfs_rtems_device_ioctl (rtems_libio_t* iop,
ioctl_command_t command,
void* buffer)
{
rtems_device_major_number major;
rtems_device_minor_number minor;
rtems_rfs_rtems_device_get_major_and_minor (iop, &major, &minor);
return rtems_deviceio_control (iop, command, buffer, major, minor);
}
/**
* The consumes the truncate call. You cannot truncate device files.
*
* @param iop
* @param length
* @return int
*/
static int
rtems_rfs_rtems_device_ftruncate (rtems_libio_t* iop, off_t length)
{
return 0;
}
/*
* Handler table for RFS device nodes
*/
const rtems_filesystem_file_handlers_r rtems_rfs_rtems_device_handlers = {
.open_h = rtems_rfs_rtems_device_open,
.close_h = rtems_rfs_rtems_device_close,
.read_h = rtems_rfs_rtems_device_read,
.write_h = rtems_rfs_rtems_device_write,
.ioctl_h = rtems_rfs_rtems_device_ioctl,
.lseek_h = rtems_filesystem_default_lseek_file,
.fstat_h = rtems_rfs_rtems_fstat,
.ftruncate_h = rtems_rfs_rtems_device_ftruncate,
.fsync_h = rtems_filesystem_default_fsync_or_fdatasync,
.fdatasync_h = rtems_filesystem_default_fsync_or_fdatasync,
.fcntl_h = rtems_filesystem_default_fcntl,
.kqfilter_h = rtems_filesystem_default_kqfilter,
.poll_h = rtems_filesystem_default_poll,
.readv_h = rtems_filesystem_default_readv,
.writev_h = rtems_filesystem_default_writev
};
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