Home | History | Annotate | Line # | Download | only in newfs_sysvbfs
newfs_sysvbfs.c revision 1.10 
      1 /*	$NetBSD: newfs_sysvbfs.c,v 1.10 2017/01/10 20:49:20 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2004 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 #include <sys/cdefs.h>
     32 __RCSID("$NetBSD: newfs_sysvbfs.c,v 1.10 2017/01/10 20:49:20 christos Exp $");
     33 
     34 #include <sys/param.h>
     35 #include <sys/types.h>
     36 #include <sys/disklabel.h>
     37 #include <sys/errno.h>
     38 #include <sys/ioctl.h>
     39 #include <sys/stat.h>
     40 
     41 #include <assert.h>
     42 #include <err.h>
     43 #include <fcntl.h>
     44 #include <stdio.h>
     45 #include <stdlib.h>
     46 #include <string.h>
     47 #include <time.h>
     48 #include <unistd.h>
     49 
     50 #include <fs/sysvbfs/bfs.h>
     51 
     52 __dead static void usage(void);
     53 static int bfs_newfs(int, uint32_t);
     54 
     55 int
     56 main(int argc, char **argv)
     57 {
     58 	const char *device;
     59 	struct disklabel d;
     60 	struct partition *p;
     61 	struct stat st;
     62 	uint32_t partsize;
     63 	int Fflag, Zflag;
     64 	int part;
     65 	int fd, ch;
     66 
     67 	if (argc < 2)
     68 		usage();
     69 
     70 	Fflag = Zflag = partsize = 0;
     71 	while ((ch = getopt(argc, argv, "Fs:Z")) != -1) {
     72 		switch (ch) {
     73 		case 'F':
     74 			Fflag = 1;
     75 			break;
     76 		case 's':
     77 			partsize = atoi(optarg);
     78 			break;
     79 		case 'Z':
     80 			Zflag = 1;
     81 			break;
     82 		default:
     83 			usage();
     84 			/*NOTREACHED*/
     85 		}
     86 	}
     87 	argc -= optind;
     88 	argv += optind;
     89 
     90 	if (argc != 1)
     91 		usage();
     92 	device = argv[0];
     93 
     94 	if (!Fflag) {
     95 		if ((fd = open(device, O_RDWR)) == -1) {
     96 			perror("open device");
     97 			exit(EXIT_FAILURE);
     98 		}
     99 		if (fstat(fd, &st) != 0) {
    100 			perror("device stat");
    101 			goto err_exit;
    102 		}
    103 		if (!S_ISCHR(st.st_mode)) {
    104 			fprintf(stderr, "WARNING: not a raw device.\n");
    105 		}
    106 
    107 		part = DISKPART(st.st_rdev);
    108 
    109 		if (ioctl(fd, DIOCGDINFO, &d) == -1) {
    110 			perror("disklabel");
    111 			goto err_exit;
    112 		}
    113 		p = &d.d_partitions[part];
    114 		printf("partition = %d\n", part);
    115 		printf("size=%d offset=%d fstype=%d secsize=%d\n",
    116 		    p->p_size, p->p_offset, p->p_fstype, d.d_secsize);
    117 
    118 		if (p->p_fstype != FS_SYSVBFS) {
    119 			fprintf(stderr, "not a SysVBFS partition.\n");
    120 			goto err_exit;
    121 		}
    122 		partsize = p->p_size;
    123 	} else {
    124 		off_t filesize;
    125 		uint8_t zbuf[8192] = {0, };
    126 
    127 		if (partsize == 0) {
    128 			warnx("-F requires -s");
    129 			exit(EXIT_FAILURE);
    130 		}
    131 
    132 		filesize = partsize << BFS_BSHIFT;
    133 
    134 		fd = open(device, O_RDWR|O_CREAT|O_TRUNC, 0666);
    135 		if (fd == -1) {
    136 			perror("open file");
    137 			exit(EXIT_FAILURE);
    138 		}
    139 
    140 		if (Zflag) {
    141 			while (filesize > 0) {
    142 				size_t writenow = MIN(filesize, (off_t)sizeof(zbuf));
    143 
    144 				if ((size_t)write(fd, zbuf, writenow) != writenow) {
    145 					perror("zwrite");
    146 					exit(EXIT_FAILURE);
    147 				}
    148 				filesize -= writenow;
    149 			}
    150 		} else {
    151 			if (lseek(fd, filesize-1, SEEK_SET) == -1) {
    152 				perror("lseek");
    153 				exit(EXIT_FAILURE);
    154 			}
    155 			if (write(fd, zbuf, 1) != 1) {
    156 				perror("write");
    157 				exit(EXIT_FAILURE);
    158 			}
    159 			if (lseek(fd, 0, SEEK_SET) == -1) {
    160 				perror("lseek 2");
    161 				exit(EXIT_FAILURE);
    162 			}
    163 		}
    164 	}
    165 
    166 	if (bfs_newfs(fd, partsize) != 0)
    167 		goto err_exit;
    168 
    169 	close(fd);
    170 
    171 	return 0;
    172  err_exit:
    173 	close(fd);
    174 	exit(EXIT_FAILURE);
    175 }
    176 
    177 static int
    178 bfs_newfs(int fd, uint32_t nsectors)
    179 {
    180 	uint8_t buf[DEV_BSIZE];
    181 	struct bfs_super_block *bfs = (void *)buf;
    182 	struct bfs_inode *inode = (void *)buf;
    183 	struct bfs_dirent *dirent = (void *)buf;
    184 	time_t t = time(0);
    185 	int error;
    186 
    187 	/* Super block */
    188 	memset(buf, 0, DEV_BSIZE);
    189 	bfs->header.magic = BFS_MAGIC;
    190 	bfs->header.data_start_byte = DEV_BSIZE * 2; /* super block + inode */
    191 	bfs->header.data_end_byte = nsectors * BFS_BSIZE - 1;
    192 	bfs->compaction.from = 0xffffffff;
    193 	bfs->compaction.to = 0xffffffff;
    194 	bfs->compaction.from_backup = 0xffffffff;
    195 	bfs->compaction.to_backup = 0xffffffff;
    196 
    197 	if ((error = lseek(fd, 0, SEEK_SET)) == -1) {
    198 		perror("seek super block");
    199 		return -1;
    200 	}
    201 	if (write(fd, buf, BFS_BSIZE) < 0) {
    202 		perror("write super block");
    203 		return -1;
    204 	}
    205 
    206 	/* i-node table */
    207 	memset(buf, 0, BFS_BSIZE);
    208 	inode->number = BFS_ROOT_INODE;
    209 	inode->start_sector = 2;
    210 	inode->end_sector = 2;
    211 	inode->eof_offset_byte = sizeof(struct bfs_dirent) +
    212 	    inode->start_sector * BFS_BSIZE;
    213 	inode->attr.atime = t;
    214 	inode->attr.mtime = t;
    215 	inode->attr.ctime = t;
    216 	inode->attr.mode = 0755;
    217 	inode->attr.type = 2;	/* DIR */
    218 	inode->attr.nlink = 2;	/* . + .. */
    219 	if (write(fd, buf, BFS_BSIZE) < 0) {
    220 		perror("write i-node");
    221 		return -1;
    222 	}
    223 
    224 	/* dirent table */
    225 	memset(buf, 0, BFS_BSIZE);
    226 	dirent->inode = BFS_ROOT_INODE;
    227 	strcpy(dirent->name, ".");
    228 	dirent++;
    229 	dirent->inode = BFS_ROOT_INODE;
    230 	strcpy(dirent->name, "..");
    231 	if (write(fd, buf, BFS_BSIZE) < 0) {
    232 		perror("write dirent");
    233 		return -1;
    234 	}
    235 
    236 	return 0;
    237 }
    238 
    239 static void
    240 usage(void)
    241 {
    242 
    243 	(void)fprintf(stderr, "usage: %s [-FZ] [-s sectors] special-device\n",
    244 	    getprogname());
    245 	exit(EXIT_FAILURE);
    246 }
    247