minix/sys/fs/v7fs/v7fs_io_user.c
Jean-Baptiste Boric 9f988b7934 Import makefs from NetBSD
Change-Id: I0ebcc9d0168df9d26cfb0af0fce2bc894ce688af
2015-10-07 12:39:44 +02:00

172 lines
4.4 KiB
C

/* $NetBSD: v7fs_io_user.c,v 1.4 2011/08/08 11:42:30 uch Exp $ */
/*-
* Copyright (c) 2011 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by UCHIYAMA Yasushi.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: v7fs_io_user.c,v 1.4 2011/08/08 11:42:30 uch Exp $");
#endif /* not lint */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <err.h>
#include <sys/mman.h>
#include "v7fs.h"
#include "v7fs_endian.h"
#include "v7fs_impl.h"
#ifdef V7FS_IO_DEBUG
#define DPRINTF(fmt, args...) printf("%s: " fmt, __func__, ##args)
#else
#define DPRINTF(fmt, args...) ((void)0)
#endif
struct local_io {
int fd;
size_t size;
size_t blksz;
uint8_t *addr;
} local;
static bool read_sector(void *, uint8_t *, daddr_t);
static bool write_sector(void *, uint8_t *, daddr_t);
static bool read_mmap(void *, uint8_t *, daddr_t);
static bool write_mmap(void *, uint8_t *, daddr_t);
int
v7fs_io_init(struct v7fs_self **fs, const struct v7fs_mount_device *mount,
size_t block_size)
{
struct v7fs_self *p;
if (!(p = (struct v7fs_self *)malloc(sizeof(*p))))
return ENOMEM;
memset(p, 0, sizeof(*p));
/* Endian */
p->endian = mount->endian;
#ifdef V7FS_EI
v7fs_endian_init(p);
#endif
local.blksz = block_size;
local.fd = mount->device.fd;
local.size = mount->sectors * block_size;
local.addr = mmap(NULL, local.size, PROT_READ | PROT_WRITE | PROT_NONE,
MAP_FILE | MAP_SHARED/*writeback*/, local.fd, 0);
if (local.addr == MAP_FAILED) {
local.addr = 0;
p->io.read = read_sector;
p->io.write = write_sector;
} else {
DPRINTF("mmaped addr=%p\n", local.addr);
p->io.read = read_mmap;
p->io.write = write_mmap;
}
p->io.cookie = &local;
*fs = p;
return 0;
}
void
v7fs_io_fini(struct v7fs_self *fs)
{
struct local_io *lio = (struct local_io *)fs->io.cookie;
if (lio->addr) {
if (munmap(lio->addr, lio->size) != 0)
warn(0);
}
fsync(lio->fd);
free(fs);
}
static bool
read_sector(void *ctx, uint8_t *buf, daddr_t sector)
{
struct local_io *lio = (struct local_io *)ctx;
size_t blksz = lio->blksz;
int fd = lio->fd;
if ((lseek(fd, (off_t)sector * blksz, SEEK_SET) < 0) ||
(read(fd, buf, blksz) < (ssize_t)blksz)) {
warn("sector=%ld\n", (long)sector);
return false;
}
return true;
}
static bool
write_sector(void *ctx, uint8_t *buf, daddr_t sector)
{
struct local_io *lio = (struct local_io *)ctx;
size_t blksz = lio->blksz;
int fd = lio->fd;
if ((lseek(fd, (off_t)sector * blksz, SEEK_SET) < 0) ||
(write(fd, buf, blksz) < (ssize_t)blksz)) {
warn("sector=%ld\n", (long)sector);
return false;
}
return true;
}
static bool
read_mmap(void *ctx, uint8_t *buf, daddr_t sector)
{
struct local_io *lio = (struct local_io *)ctx;
size_t blksz = lio->blksz;
memcpy(buf, lio->addr + sector * blksz, blksz);
return true;
}
static bool
write_mmap(void *ctx, uint8_t *buf, daddr_t sector)
{
struct local_io *lio = (struct local_io *)ctx;
size_t blksz = lio->blksz;
memcpy(lio->addr + sector * blksz, buf, blksz);
return true;
}