host.c revision 199767f8919635c4928607450d9e0abb932109ce
/*-
* Copyright (c) 2011 Google, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* Read from the host filesystem
*/
#include <sys/param.h>
#include <sys/time.h>
#include <stddef.h>
#include <stdarg.h>
#include <string.h>
#include <stand.h>
#include <bootstrap.h>
#include "libuserboot.h"
/*
* Open a file.
*/
static int
host_open(const char *upath, struct open_file *f)
{
if (f->f_dev != &host_dev)
return (EINVAL);
return (CALLBACK(open, upath, &f->f_fsdata));
}
static int
host_close(struct open_file *f)
{
CALLBACK(close, f->f_fsdata);
f->f_fsdata = (void *)0;
return (0);
}
/*
* Copy a portion of a file into memory.
*/
static int
host_read(struct open_file *f, void *start, size_t size, size_t *resid)
{
return (CALLBACK(read, f->f_fsdata, start, size, resid));
}
/*
* Don't be silly - the bootstrap has no business writing anything.
*/
static int
host_write(struct open_file *f, void *start, size_t size, size_t *resid)
{
return (EROFS);
}
static off_t
host_seek(struct open_file *f, off_t offset, int where)
{
return (CALLBACK(seek, f->f_fsdata, offset, where));
}
static int
host_stat(struct open_file *f, struct stat *sb)
{
int mode;
int uid;
int gid;
uint64_t size;
CALLBACK(stat, f->f_fsdata, &mode, &uid, &gid, &size);
sb->st_mode = mode;
sb->st_uid = uid;
sb->st_gid = gid;
sb->st_size = size;
return (0);
}
static int
host_readdir(struct open_file *f, struct dirent *d)
{
uint32_t fileno;
uint8_t type;
size_t namelen;
int rc;
rc = CALLBACK(readdir, f->f_fsdata, &fileno, &type, &namelen,
d->d_name);
if (rc)
return (rc);
d->d_fileno = fileno;
d->d_type = type;
d->d_namlen = namelen;
return (0);
}
static int
host_dev_init(void)
{
return (0);
}
static void
host_dev_print(int verbose)
{
char line[80];
sprintf(line, " host%d: Host filesystem\n", 0);
pager_output(line);
}
/*
* 'Open' the host device.
*/
static int
host_dev_open(struct open_file *f, ...)
{
va_list args;
struct devdesc *dev;
va_start(args, f);
dev = va_arg(args, struct devdesc*);
va_end(args);
return (0);
}
static int
host_dev_close(struct open_file *f)
{
return (0);
}
static int
host_dev_strategy(void *devdata, int rw, daddr_t dblk, size_t size,
char *buf, size_t *rsize)
{
return (ENOSYS);
}
struct fs_ops host_fsops = {
"host",
host_open,
host_close,
host_read,
host_write,
host_seek,
host_stat,
host_readdir
};
struct devsw host_dev = {
.dv_name = "host",
.dv_type = DEVT_NET,
.dv_init = host_dev_init,
.dv_strategy = host_dev_strategy,
.dv_open = host_dev_open,
.dv_close = host_dev_close,
.dv_ioctl = noioctl,
.dv_print = host_dev_print,
.dv_cleanup = NULL
};