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      1 /*	$NetBSD: v7fs_io_user.c,v 1.4 2011/08/08 11:42:30 uch Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2011 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by UCHIYAMA Yasushi.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #if HAVE_NBTOOL_CONFIG_H
     33 #include "nbtool_config.h"
     34 #endif
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 __RCSID("$NetBSD: v7fs_io_user.c,v 1.4 2011/08/08 11:42:30 uch Exp $");
     39 #endif /* not lint */
     40 
     41 #include <stdio.h>
     42 #include <stdlib.h>
     43 #include <string.h>
     44 #include <errno.h>
     45 #include <unistd.h>
     46 #include <err.h>
     47 #include <sys/mman.h>
     48 #include "v7fs.h"
     49 #include "v7fs_endian.h"
     50 #include "v7fs_impl.h"
     51 
     52 #ifdef V7FS_IO_DEBUG
     53 #define	DPRINTF(fmt, args...)	printf("%s: " fmt, __func__, ##args)
     54 #else
     55 #define	DPRINTF(fmt, args...)	((void)0)
     56 #endif
     57 
     58 struct local_io {
     59 	int fd;
     60 	size_t size;
     61 	size_t blksz;
     62 	uint8_t *addr;
     63 } local;
     64 
     65 static bool read_sector(void *, uint8_t *, daddr_t);
     66 static bool write_sector(void *, uint8_t *, daddr_t);
     67 static bool read_mmap(void *, uint8_t *, daddr_t);
     68 static bool write_mmap(void *, uint8_t *, daddr_t);
     69 
     70 int
     71 v7fs_io_init(struct v7fs_self **fs, const struct v7fs_mount_device *mount,
     72     size_t block_size)
     73 {
     74 	struct v7fs_self *p;
     75 
     76 	if (!(p = (struct v7fs_self *)malloc(sizeof(*p))))
     77 		return ENOMEM;
     78 	memset(p, 0, sizeof(*p));
     79 
     80 	/* Endian */
     81 	p->endian = mount->endian;
     82 #ifdef V7FS_EI
     83 	v7fs_endian_init(p);
     84 #endif
     85 	local.blksz = block_size;
     86 	local.fd = mount->device.fd;
     87 	local.size = mount->sectors * block_size;
     88 	local.addr = mmap(NULL, local.size, PROT_READ | PROT_WRITE | PROT_NONE,
     89 	    MAP_FILE | MAP_SHARED/*writeback*/, local.fd,  0);
     90 	if (local.addr == MAP_FAILED) {
     91 		local.addr = 0;
     92 		p->io.read = read_sector;
     93 		p->io.write = write_sector;
     94 	} else {
     95 		DPRINTF("mmaped addr=%p\n", local.addr);
     96 		p->io.read = read_mmap;
     97 		p->io.write = write_mmap;
     98 	}
     99 
    100 	p->io.cookie = &local;
    101 	*fs = p;
    102 
    103 	return 0;
    104 }
    105 
    106 void
    107 v7fs_io_fini(struct v7fs_self *fs)
    108 {
    109 	struct local_io *lio = (struct local_io *)fs->io.cookie;
    110 
    111 	if (lio->addr) {
    112 		if (munmap(lio->addr, lio->size) != 0)
    113 			warn(0);
    114 	}
    115 	fsync(lio->fd);
    116 
    117 	free(fs);
    118 }
    119 
    120 static bool
    121 read_sector(void *ctx, uint8_t *buf, daddr_t sector)
    122 {
    123 	struct local_io *lio = (struct local_io *)ctx;
    124 	size_t blksz = lio->blksz;
    125 	int fd = lio->fd;
    126 
    127 	if ((lseek(fd, (off_t)sector * blksz, SEEK_SET) < 0) ||
    128 	    (read(fd, buf, blksz) < (ssize_t)blksz)) {
    129 		warn("sector=%ld\n", (long)sector);
    130 		return false;
    131 	}
    132 
    133 	return true;
    134 }
    135 
    136 static bool
    137 write_sector(void *ctx, uint8_t *buf, daddr_t sector)
    138 {
    139 	struct local_io *lio = (struct local_io *)ctx;
    140 	size_t blksz = lio->blksz;
    141 	int fd = lio->fd;
    142 
    143 	if ((lseek(fd, (off_t)sector * blksz, SEEK_SET) < 0) ||
    144 	    (write(fd, buf, blksz) < (ssize_t)blksz)) {
    145 		warn("sector=%ld\n", (long)sector);
    146 		return false;
    147 	}
    148 
    149 	return true;
    150 }
    151 
    152 static bool
    153 read_mmap(void *ctx, uint8_t *buf, daddr_t sector)
    154 {
    155 	struct local_io *lio = (struct local_io *)ctx;
    156 	size_t blksz = lio->blksz;
    157 
    158 	memcpy(buf, lio->addr + sector * blksz, blksz);
    159 
    160 	return true;
    161 }
    162 
    163 static bool
    164 write_mmap(void *ctx, uint8_t *buf, daddr_t sector)
    165 {
    166 	struct local_io *lio = (struct local_io *)ctx;
    167 	size_t blksz = lio->blksz;
    168 
    169 	memcpy(lio->addr + sector * blksz, buf, blksz);
    170 
    171 	return true;
    172 }
    173