/*
* 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.com/license/LICENSE.
*
* $Id$
*/
/**
* @file
*
* @ingroup rtems-rfs
*
* RTEMS RFS File Handlers
*
* This file contains the set of handlers used to process operations on
* RFS file nodes.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <inttypes.h>
#include <rtems/rfs/rtems-rfs-file.h>
#include "rtems-rfs-rtems.h"
/**
* This routine processes the open() system call. Note that there is nothing
* special to be done at open() time.
*
* @param iop
* @param pathname
* @param flag
* @param mode
* @return int
*/
static int
rtems_rfs_rtems_file_open (rtems_libio_t* iop,
const char* pathname,
uint32_t flag,
uint32_t mode)
{
rtems_rfs_file_system* fs = rtems_rfs_rtems_pathloc_dev (&iop->pathinfo);
rtems_rfs_ino ino;
rtems_rfs_file_handle* file;
uint32_t flags;
int rc;
flags = 0;
if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_OPEN))
printf("rtems-rfs: file-open: path:%s ino:%" PRId32 " flags:%04" PRIx32 " mode:%04" PRIx32 "\n",
pathname, ino, flags, mode);
rtems_rfs_rtems_lock (fs);
ino = rtems_rfs_rtems_get_iop_ino (iop);
rc = rtems_rfs_file_open (fs, ino, flags, &file);
if (rc > 0)
{
rtems_rfs_rtems_unlock (fs);
return rtems_rfs_rtems_error ("file-open: open", rc);
}
if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_OPEN))
printf("rtems-rfs: file-open: handle:%p\n", file);
iop->size = rtems_rfs_file_size (file);
iop->file_info = file;
rtems_rfs_rtems_unlock (fs);
return 0;
}
/**
* This routine processes the close() system call. Note that there is nothing
* to flush at this point.
*
* @param iop
* @return int
*/
static int
rtems_rfs_rtems_file_close (rtems_libio_t* iop)
{
rtems_rfs_file_handle* file = iop->file_info;
rtems_rfs_file_system* fs = rtems_rfs_file_fs (file);
int rc;
if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_CLOSE))
printf("rtems-rfs: file-close: handle:%p\n", file);
rtems_rfs_rtems_lock (fs);
rc = rtems_rfs_file_close (fs, file);
if (rc > 0)
rc = rtems_rfs_rtems_error ("file-close: file close", rc);
rtems_rfs_rtems_unlock (fs);
return rc;
}
/**
* This routine processes the read() system call.
*
* @param iop
* @param buffer
* @param count
* @return int
*/
ssize_t
rtems_rfs_rtems_file_read (rtems_libio_t* iop,
void* buffer,
size_t count)
{
rtems_rfs_file_handle* file = iop->file_info;
rtems_rfs_pos pos;
uint8_t* data = buffer;
ssize_t read = 0;
int rc;
if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_READ))
printf("rtems-rfs: file-read: handle:%p count:%zd\n", file, count);
rtems_rfs_rtems_lock (rtems_rfs_file_fs (file));
pos = iop->offset;
if (pos < rtems_rfs_file_size (file))
{
while (count)
{
size_t size;
rc = rtems_rfs_file_io_start (file, &size, true);
if (rc > 0)
{
read = rtems_rfs_rtems_error ("file-read: read: io-start", rc);
break;
}
if (size == 0)
break;
if (size > count)
size = count;
memcpy (data, rtems_rfs_file_data (file), size);
data += size;
count -= size;
read += size;
rc = rtems_rfs_file_io_end (file, size, true);
if (rc > 0)
{
read = rtems_rfs_rtems_error ("file-read: read: io-end", rc);
break;
}
}
}
rtems_rfs_rtems_unlock (rtems_rfs_file_fs (file));
return read;
}
/**
* This routine processes the write() system call.
*
* @param iop
* @param buffer
* @param count
* @return ssize_t
*/
ssize_t
rtems_rfs_rtems_file_write (rtems_libio_t* iop,
const void* buffer,
size_t count)
{
rtems_rfs_file_handle* file = iop->file_info;
rtems_rfs_pos pos;
const uint8_t* data = buffer;
ssize_t write = 0;
int rc;
if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_WRITE))
printf("rtems-rfs: file-write: handle:%p count:%zd\n", file, count);
rtems_rfs_rtems_lock (rtems_rfs_file_fs (file));
pos = iop->offset;
/*
* If the iop position is past the physical end of the file we need to set
* the file size to the new length before writing. If the position equals the
* size of file we are still past the end of the file as positions number
* from 0. For a specific position we need a file that has a length of one
* more.
*/
if (pos >= rtems_rfs_file_size (file))
{
rc = rtems_rfs_file_set_size (file, pos + 1);
if (rc)
{
rtems_rfs_rtems_unlock (rtems_rfs_file_fs (file));
return rtems_rfs_rtems_error ("file-write: write extend", rc);
}
}
rtems_rfs_file_set_bpos (file, pos);
while (count)
{
size_t size = count;
rc = rtems_rfs_file_io_start (file, &size, false);
if (rc)
{
write = rtems_rfs_rtems_error ("file-write: write open", rc);
break;
}
if (size > count)
size = count;
memcpy (rtems_rfs_file_data (file), data, size);
data += size;
count -= size;
write += size;
rc = rtems_rfs_file_io_end (file, size, false);
if (rc)
{
write = rtems_rfs_rtems_error ("file-write: write close", rc);
break;
}
}
iop->size = rtems_rfs_file_size (file);
rtems_rfs_rtems_unlock (rtems_rfs_file_fs (file));
return write;
}
/**
* This routine processes the ioctl() system call.
*
* @note No ioctl()'s are currently supported for RFS files.
*
* @param iop
* @param command
* @param buffer
*/
int
rtems_rfs_rtems_file_ioctl (rtems_libio_t* iop, uint32_t command, void* buffer)
{
return 0;
}
/**
* This routine processes the lseek() system call.
*
* @param iop
* @param offset
* @param whence
* @return rtems_off64_t
*/
rtems_off64_t
rtems_rfs_rtems_file_lseek (rtems_libio_t* iop,
rtems_off64_t offset,
int whence)
{
rtems_rfs_file_handle* file = iop->file_info;
rtems_rfs_pos pos;
int rc;
if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_LSEEK))
printf("rtems-rfs: file-lseek: handle:%p offset:%Ld\n", file, offset);
rtems_rfs_rtems_lock (rtems_rfs_file_fs (file));
pos = iop->offset;
rc = rtems_rfs_file_seek (file, pos, &pos);
if (rc)
{
rtems_rfs_rtems_unlock (rtems_rfs_file_fs (file));
return rtems_rfs_rtems_error ("file_lseek: lseek", rc);
}
rtems_rfs_rtems_unlock (rtems_rfs_file_fs (file));
return iop->offset;
}
/**
* This routine processes the ftruncate() system call.
*
* @param iop
* @param length
* @return int
*/
int
rtems_rfs_rtems_file_ftruncate (rtems_libio_t* iop,
rtems_off64_t length)
{
rtems_rfs_file_handle* file = iop->file_info;
int rc;
if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_FTRUNC))
printf("rtems-rfs: file-ftrunc: handle:%p length:%Ld\n", file, length);
rtems_rfs_rtems_lock (rtems_rfs_file_fs (file));
rc = rtems_rfs_file_set_size (file, length);
if (rc)
rc = rtems_rfs_rtems_error ("file_ftruncate: set size", rc);
iop->size = rtems_rfs_file_size (file);
rtems_rfs_rtems_unlock (rtems_rfs_file_fs (file));
return rc;
}
/*
* Set of operations handlers for operations on RFS files.
*/
const rtems_filesystem_file_handlers_r rtems_rfs_rtems_file_handlers = {
.open_h = rtems_rfs_rtems_file_open,
.close_h = rtems_rfs_rtems_file_close,
.read_h = rtems_rfs_rtems_file_read,
.write_h = rtems_rfs_rtems_file_write,
.ioctl_h = rtems_rfs_rtems_file_ioctl,
.lseek_h = rtems_rfs_rtems_file_lseek,
.fstat_h = rtems_rfs_rtems_stat,
.fchmod_h = rtems_rfs_rtems_fchmod,
.ftruncate_h = rtems_rfs_rtems_file_ftruncate,
.fpathconf_h = NULL,
.fsync_h = rtems_rfs_rtems_fdatasync,
.fdatasync_h = rtems_rfs_rtems_fdatasync,
.fcntl_h = rtems_rfs_rtems_fcntl,
.rmnod_h = rtems_rfs_rtems_rmnod
};
