1197518Sbz/*- 2197518Sbz * Copyright (c) 2009 Ed Schouten <ed@FreeBSD.org> 3197518Sbz * All rights reserved. 4197518Sbz * 5197518Sbz * Redistribution and use in source and binary forms, with or without 6197518Sbz * modification, are permitted provided that the following conditions 7197518Sbz * are met: 8197518Sbz * 1. Redistributions of source code must retain the above copyright 9197518Sbz * notice, this list of conditions and the following disclaimer. 10197518Sbz * 2. Redistributions in binary form must reproduce the above copyright 11197518Sbz * notice, this list of conditions and the following disclaimer in the 12197518Sbz * documentation and/or other materials provided with the distribution. 13197518Sbz * 14197518Sbz * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15197518Sbz * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16197518Sbz * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17197518Sbz * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18197518Sbz * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19197518Sbz * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20197518Sbz * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21197518Sbz * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22197518Sbz * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23197518Sbz * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24197518Sbz * SUCH DAMAGE. 25197518Sbz */ 26197518Sbz 27197518Sbz#include <sys/cdefs.h> 28197518Sbz__FBSDID("$FreeBSD$"); 29197518Sbz 30197518Sbz#include <sys/param.h> 31197518Sbz#include <sys/conf.h> 32197518Sbz#include <sys/kernel.h> 33197518Sbz#include <sys/malloc.h> 34197518Sbz#include <sys/module.h> 35197518Sbz#include <sys/systm.h> 36197518Sbz#include <sys/uio.h> 37197518Sbz 38197518Sbz#include <dev/lindev/lindev.h> 39197518Sbz 40197518Sbzstatic struct cdev *full_dev; 41197518Sbz 42197518Sbzstatic d_read_t full_read; 43197518Sbzstatic d_write_t full_write; 44197518Sbz 45197518Sbzstatic struct cdevsw full_cdevsw = { 46197518Sbz .d_version = D_VERSION, 47197518Sbz .d_read = full_read, 48197518Sbz .d_write = full_write, 49197518Sbz .d_name = "full", 50197518Sbz}; 51197518Sbz 52197518Sbzstatic void *zbuf; 53197518Sbz 54197518Sbz/* ARGSUSED */ 55197518Sbzstatic int 56197518Sbzfull_read(struct cdev *dev __unused, struct uio *uio, int flags __unused) 57197518Sbz{ 58197518Sbz int error = 0; 59197518Sbz 60197518Sbz while (uio->uio_resid > 0 && error == 0) 61197518Sbz error = uiomove(zbuf, MIN(uio->uio_resid, PAGE_SIZE), uio); 62197518Sbz 63197518Sbz return (error); 64197518Sbz} 65197518Sbz 66197518Sbz/* ARGSUSED */ 67197518Sbzstatic int 68197518Sbzfull_write(struct cdev *dev __unused, struct uio *uio __unused, 69197518Sbz int flags __unused) 70197518Sbz{ 71197518Sbz 72197518Sbz return (ENOSPC); 73197518Sbz} 74197518Sbz 75197518Sbz/* ARGSUSED */ 76197518Sbzint 77197518Sbzlindev_modevent_full(module_t mod __unused, int type, void *data __unused) 78197518Sbz{ 79197518Sbz 80197518Sbz switch(type) { 81197518Sbz case MOD_LOAD: 82197518Sbz zbuf = (void *)malloc(PAGE_SIZE, M_TEMP, M_WAITOK | M_ZERO); 83197518Sbz full_dev = make_dev(&full_cdevsw, 0, UID_ROOT, GID_WHEEL, 84197518Sbz 0666, "full"); 85197518Sbz if (bootverbose) 86197518Sbz printf("full: <full device>\n"); 87197518Sbz break; 88197518Sbz 89197518Sbz case MOD_UNLOAD: 90197518Sbz destroy_dev(full_dev); 91197518Sbz free(zbuf, M_TEMP); 92197518Sbz break; 93197518Sbz 94197518Sbz case MOD_SHUTDOWN: 95197518Sbz break; 96197518Sbz 97197518Sbz default: 98197518Sbz return (EOPNOTSUPP); 99197518Sbz } 100197518Sbz 101197518Sbz return (0); 102197518Sbz} 103197518Sbz 104