172 lines
4.4 KiB
C
172 lines
4.4 KiB
C
/* $NetBSD: v7fs_io_user.c,v 1.4 2011/08/08 11:42:30 uch Exp $ */
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/*-
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* Copyright (c) 2011 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by UCHIYAMA Yasushi.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#if HAVE_NBTOOL_CONFIG_H
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#include "nbtool_config.h"
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#endif
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: v7fs_io_user.c,v 1.4 2011/08/08 11:42:30 uch Exp $");
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#endif /* not lint */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <err.h>
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#include <sys/mman.h>
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#include "v7fs.h"
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#include "v7fs_endian.h"
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#include "v7fs_impl.h"
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#ifdef V7FS_IO_DEBUG
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#define DPRINTF(fmt, args...) printf("%s: " fmt, __func__, ##args)
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#else
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#define DPRINTF(fmt, args...) ((void)0)
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#endif
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struct local_io {
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int fd;
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size_t size;
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size_t blksz;
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uint8_t *addr;
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} local;
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static bool read_sector(void *, uint8_t *, daddr_t);
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static bool write_sector(void *, uint8_t *, daddr_t);
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static bool read_mmap(void *, uint8_t *, daddr_t);
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static bool write_mmap(void *, uint8_t *, daddr_t);
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int
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v7fs_io_init(struct v7fs_self **fs, const struct v7fs_mount_device *mount,
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size_t block_size)
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{
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struct v7fs_self *p;
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if (!(p = (struct v7fs_self *)malloc(sizeof(*p))))
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return ENOMEM;
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memset(p, 0, sizeof(*p));
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/* Endian */
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p->endian = mount->endian;
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#ifdef V7FS_EI
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v7fs_endian_init(p);
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#endif
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local.blksz = block_size;
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local.fd = mount->device.fd;
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local.size = mount->sectors * block_size;
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local.addr = mmap(NULL, local.size, PROT_READ | PROT_WRITE | PROT_NONE,
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MAP_FILE | MAP_SHARED/*writeback*/, local.fd, 0);
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if (local.addr == MAP_FAILED) {
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local.addr = 0;
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p->io.read = read_sector;
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p->io.write = write_sector;
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} else {
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DPRINTF("mmaped addr=%p\n", local.addr);
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p->io.read = read_mmap;
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p->io.write = write_mmap;
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}
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p->io.cookie = &local;
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*fs = p;
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return 0;
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}
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void
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v7fs_io_fini(struct v7fs_self *fs)
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{
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struct local_io *lio = (struct local_io *)fs->io.cookie;
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if (lio->addr) {
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if (munmap(lio->addr, lio->size) != 0)
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warn(0);
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}
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fsync(lio->fd);
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free(fs);
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}
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static bool
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read_sector(void *ctx, uint8_t *buf, daddr_t sector)
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{
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struct local_io *lio = (struct local_io *)ctx;
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size_t blksz = lio->blksz;
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int fd = lio->fd;
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if ((lseek(fd, (off_t)sector * blksz, SEEK_SET) < 0) ||
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(read(fd, buf, blksz) < (ssize_t)blksz)) {
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warn("sector=%ld\n", (long)sector);
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return false;
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}
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return true;
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}
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static bool
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write_sector(void *ctx, uint8_t *buf, daddr_t sector)
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{
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struct local_io *lio = (struct local_io *)ctx;
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size_t blksz = lio->blksz;
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int fd = lio->fd;
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if ((lseek(fd, (off_t)sector * blksz, SEEK_SET) < 0) ||
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(write(fd, buf, blksz) < (ssize_t)blksz)) {
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warn("sector=%ld\n", (long)sector);
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return false;
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}
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return true;
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}
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static bool
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read_mmap(void *ctx, uint8_t *buf, daddr_t sector)
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{
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struct local_io *lio = (struct local_io *)ctx;
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size_t blksz = lio->blksz;
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memcpy(buf, lio->addr + sector * blksz, blksz);
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return true;
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}
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static bool
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write_mmap(void *ctx, uint8_t *buf, daddr_t sector)
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{
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struct local_io *lio = (struct local_io *)ctx;
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size_t blksz = lio->blksz;
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memcpy(lio->addr + sector * blksz, buf, blksz);
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return true;
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}
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