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/* Device input and output
Copyright (C) 1992, 1993, 1994, 1995, 1996 Free Software Foundation, Inc.
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
The GNU Hurd is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with the GNU Hurd; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <device/device.h>
#include <device/device_request.h>
#include <diskfs.h>
/* Write disk block ADDR with DATA of LEN bytes to DISKFS_DEVICE, waiting for
completion. ADDR is offset by DISKFS_DEVICE_START. If an error occurs,
EIO is returned. */
error_t
diskfs_device_write_sync (off_t addr, vm_address_t data, size_t len)
{
int written;
error_t err;
assert (!diskfs_readonly);
err = device_write (diskfs_device, 0, diskfs_device_start + addr,
(io_buf_ptr_t) data, len, &written);
if (err == D_READ_ONLY)
return EROFS;
else if (err || written != len)
return EIO;
return 0;
}
/* Read disk block ADDR from DISKFS_DEVICE; put the address of the data in
DATA; read LEN bytes. Always *DATA should be a full page no matter what.
ADDR is offset by DISKFS_DEVICE_START. If an error occurs, EIO is
returned. */
error_t
diskfs_device_read_sync (off_t addr, vm_address_t *data, size_t len)
{
unsigned read;
if (device_read (diskfs_device, 0, diskfs_device_start + addr, len,
(io_buf_ptr_t *)data, &read)
|| read != len)
return EIO;
return 0;
}
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