/**
* This routine processes the read() system call.
*
* @param iop
* @param buffer
* @param count
* @return int
*/
static ssize_t
rtems_rfs_rtems_file_read (rtems_libio_t* iop,
void* buffer,
size_t count)
{
rtems_rfs_file_handle* file = rtems_rfs_rtems_get_iop_file_handle (iop);
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 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 *) (uintptr_t) minor;
return rtems_deviceio_open (iop, pathname, oflag, mode, minor, major);
}
static int
rtems_rfs_rtems_file_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_file_handle* file;
int 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:%04i mode:%04" PRIu32 "\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);
rtems_rfs_rtems_set_iop_file_handle (iop, 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 = rtems_rfs_rtems_get_iop_file_handle (iop);
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 ftruncate() system call.
*
* @param iop
* @param length
* @return int
*/
static int
rtems_rfs_rtems_file_ftruncate (rtems_libio_t* iop,
off_t length)
{
rtems_rfs_file_handle* file = rtems_rfs_rtems_get_iop_file_handle (iop);
int rc;
if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_FTRUNC))
printf("rtems-rfs: file-ftrunc: handle:%p length:%" PRIdoff_t "\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);
rtems_rfs_rtems_unlock (rtems_rfs_file_fs (file));
return rc;
}
/**
* This routine processes the write() system call.
*
* @param iop
* @param buffer
* @param count
* @return ssize_t
*/
static ssize_t
rtems_rfs_rtems_file_write (rtems_libio_t* iop,
const void* buffer,
size_t count)
{
rtems_rfs_file_handle* file = rtems_rfs_rtems_get_iop_file_handle (iop);
rtems_rfs_pos pos;
rtems_rfs_pos file_size;
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;
file_size = rtems_rfs_file_size (file);
if (pos > file_size)
{
/*
* 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. The
* rtems_rfs_file_io_end() will grow the file subsequently.
*/
rc = rtems_rfs_file_set_size (file, pos);
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);
}
else if (pos < file_size && rtems_libio_iop_is_append(iop))
{
pos = file_size;
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-write: write append seek", rc);
}
}
while (count)
{
size_t size = count;
rc = rtems_rfs_file_io_start (file, &size, false);
if (rc)
{
/*
* If we have run out of space and have written some data return that
* amount first as the inode will have accounted for it. This means
* there was no error and the return code from can be ignored.
*/
if (!write)
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;
}
}
if (write >= 0)
iop->offset = pos + write;
rtems_rfs_rtems_unlock (rtems_rfs_file_fs (file));
return write;
}
int
rtems_rfs_rtems_initialise (rtems_filesystem_mount_table_entry_t* mt_entry,
const void* data)
{
rtems_rfs_rtems_private* rtems;
rtems_rfs_file_system* fs;
uint32_t flags = 0;
uint32_t max_held_buffers = RTEMS_RFS_FS_MAX_HELD_BUFFERS;
const char* options = data;
int rc;
/*
* Parse the options the user specifiies.
*/
while (options)
{
printf ("options=%s\n", options);
if (strncmp (options, "hold-bitmaps",
sizeof ("hold-bitmaps") - 1) == 0)
flags |= RTEMS_RFS_FS_BITMAPS_HOLD;
else if (strncmp (options, "no-local-cache",
sizeof ("no-local-cache") - 1) == 0)
flags |= RTEMS_RFS_FS_NO_LOCAL_CACHE;
else if (strncmp (options, "max-held-bufs",
sizeof ("max-held-bufs") - 1) == 0)
{
max_held_buffers = strtoul (options + sizeof ("max-held-bufs"), 0, 0);
}
else
return rtems_rfs_rtems_error ("initialise: invalid option", EINVAL);
options = strchr (options, ',');
if (options)
{
++options;
if (*options == '\0')
options = NULL;
}
}
rtems = malloc (sizeof (rtems_rfs_rtems_private));
if (!rtems)
return rtems_rfs_rtems_error ("initialise: local data", ENOMEM);
memset (rtems, 0, sizeof (rtems_rfs_rtems_private));
rc = rtems_rfs_mutex_create (&rtems->access);
if (rc > 0)
{
free (rtems);
return rtems_rfs_rtems_error ("initialise: cannot create mutex", rc);
}
rc = rtems_rfs_mutex_lock (&rtems->access);
if (rc > 0)
{
rtems_rfs_mutex_destroy (&rtems->access);
free (rtems);
return rtems_rfs_rtems_error ("initialise: cannot lock access mutex", rc);
}
rc = rtems_rfs_fs_open (mt_entry->dev, rtems, flags, max_held_buffers, &fs);
if (rc)
{
free (rtems);
return rtems_rfs_rtems_error ("initialise: open", rc);
}
mt_entry->fs_info = fs;
mt_entry->ops = &rtems_rfs_ops;
mt_entry->mt_fs_root->location.node_access = (void*) RTEMS_RFS_ROOT_INO;
mt_entry->mt_fs_root->location.handlers = &rtems_rfs_rtems_dir_handlers;
rtems_rfs_rtems_unlock (fs);
return 0;
}
/**
* This routine processes the write() system call.
*
* @param iop
* @param buffer
* @param count
* @return ssize_t
*/
static ssize_t
rtems_rfs_rtems_file_write (rtems_libio_t* iop,
const void* buffer,
size_t count)
{
rtems_rfs_file_handle* file = rtems_rfs_rtems_get_iop_file_handle (iop);
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;
}