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v7fs_io_user.c revision 1.3 
      1 /*	$NetBSD: v7fs_io_user.c,v 1.3 2011/08/03 16:21:52 dholland 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 1.3 2011/08/03 16:21:52 dholland 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 		warn("mmap failed. use direct I/O.");
     92 		local.addr = 0;
     93 		p->io.read = read_sector;
     94 		p->io.write = write_sector;
     95 	} else {
     96 		DPRINTF("mmaped addr=%p\n", local.addr);
     97 		p->io.read = read_mmap;
     98 		p->io.write = write_mmap;
     99 	}
    100 
    101 	p->io.cookie = &local;
    102 	*fs = p;
    103 
    104 	return 0;
    105 }
    106 
    107 void
    108 v7fs_io_fini(struct v7fs_self *fs)
    109 {
    110 	struct local_io *lio = (struct local_io *)fs->io.cookie;
    111 
    112 	if (lio->addr) {
    113 		if (munmap(lio->addr, lio->size) != 0)
    114 			warn(0);
    115 	}
    116 	fsync(lio->fd);
    117 
    118 	free(fs);
    119 }
    120 
    121 static bool
    122 read_sector(void *ctx, uint8_t *buf, daddr_t sector)
    123 {
    124 	struct local_io *lio = (struct local_io *)ctx;
    125 	size_t blksz = lio->blksz;
    126 	int fd = lio->fd;
    127 
    128 	if ((lseek(fd, (off_t)sector * blksz, SEEK_SET) < 0) ||
    129 	    (read(fd, buf, blksz) < (ssize_t)blksz)) {
    130 		warn("sector=%ld\n", (long)sector);
    131 		return false;
    132 	}
    133 
    134 	return true;
    135 }
    136 
    137 static bool
    138 write_sector(void *ctx, uint8_t *buf, daddr_t sector)
    139 {
    140 	struct local_io *lio = (struct local_io *)ctx;
    141 	size_t blksz = lio->blksz;
    142 	int fd = lio->fd;
    143 
    144 	if ((lseek(fd, (off_t)sector * blksz, SEEK_SET) < 0) ||
    145 	    (write(fd, buf, blksz) < (ssize_t)blksz)) {
    146 		warn("sector=%ld\n", (long)sector);
    147 		return false;
    148 	}
    149 
    150 	return true;
    151 }
    152 
    153 static bool
    154 read_mmap(void *ctx, uint8_t *buf, daddr_t sector)
    155 {
    156 	struct local_io *lio = (struct local_io *)ctx;
    157 	size_t blksz = lio->blksz;
    158 
    159 	memcpy(buf, lio->addr + sector * blksz, blksz);
    160 
    161 	return true;
    162 }
    163 
    164 static bool
    165 write_mmap(void *ctx, uint8_t *buf, daddr_t sector)
    166 {
    167 	struct local_io *lio = (struct local_io *)ctx;
    168 	size_t blksz = lio->blksz;
    169 
    170 	memcpy(lio->addr + sector * blksz, buf, blksz);
    171 
    172 	return true;
    173 }
    174