/*      $NetBSD: newfs_sysvbfs.c,v 1.10 2017/01/10 20:49:20 christos Exp $      */

/*-
 * Copyright (c) 2004 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.
 */
#include <sys/cdefs.h>
__RCSID("$NetBSD: newfs_sysvbfs.c,v 1.10 2017/01/10 20:49:20 christos Exp $");

#include <sys/param.h>
#include <sys/types.h>
#include <sys/disklabel.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/stat.h>

#include <assert.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#include <fs/sysvbfs/bfs.h>

__dead static void usage(void);
static int bfs_newfs(int, uint32_t);

int
main(int argc, char **argv)
{
        const char *device;
        struct disklabel d;
        struct partition *p;
        struct stat st;
        uint32_t partsize;
        int Fflag, Zflag;
        int part;
        int fd, ch;

        if (argc < 2)
                usage();

        Fflag = Zflag = partsize = 0;
        while ((ch = getopt(argc, argv, "Fs:Z")) != -1) {
                switch (ch) {
                case 'F':
                        Fflag = 1;
                        break;
                case 's':
                        partsize = atoi(optarg);
                        break;
                case 'Z':
                        Zflag = 1;
                        break;
                default:
                        usage();
                        /*NOTREACHED*/
                }
        }
        argc -= optind;
        argv += optind;

        if (argc != 1)
                usage();
        device = argv[0];

        if (!Fflag) {
                if ((fd = open(device, O_RDWR)) == -1) {
                        perror("open device");
                        exit(EXIT_FAILURE);
                }
                if (fstat(fd, &st) != 0) {
                        perror("device stat");
                        goto err_exit;
                }
                if (!S_ISCHR(st.st_mode)) {
                        fprintf(stderr, "WARNING: not a raw device.\n");
                }

                part = DISKPART(st.st_rdev);

                if (ioctl(fd, DIOCGDINFO, &d) == -1) {
                        perror("disklabel");
                        goto err_exit;
                }
                p = &d.d_partitions[part];
                printf("partition = %d\n", part);
                printf("size=%d offset=%d fstype=%d secsize=%d\n",
                    p->p_size, p->p_offset, p->p_fstype, d.d_secsize);

                if (p->p_fstype != FS_SYSVBFS) {
                        fprintf(stderr, "not a SysVBFS partition.\n");
                        goto err_exit;
                }
                partsize = p->p_size;
        } else {
                off_t filesize;
                uint8_t zbuf[8192] = {0, };

                if (partsize == 0) {
                        warnx("-F requires -s");
                        exit(EXIT_FAILURE);
                }

                filesize = partsize << BFS_BSHIFT;

                fd = open(device, O_RDWR|O_CREAT|O_TRUNC, 0666);
                if (fd == -1) {
                        perror("open file");
                        exit(EXIT_FAILURE);
                }

                if (Zflag) {
                        while (filesize > 0) {
                                size_t writenow = MIN(filesize, (off_t)sizeof(zbuf));

                                if ((size_t)write(fd, zbuf, writenow) != writenow) {
                                        perror("zwrite");
                                        exit(EXIT_FAILURE);
                                }
                                filesize -= writenow;
                        }
                } else {
                        if (lseek(fd, filesize-1, SEEK_SET) == -1) {
                                perror("lseek");
                                exit(EXIT_FAILURE);
                        }
                        if (write(fd, zbuf, 1) != 1) {
                                perror("write");
                                exit(EXIT_FAILURE);
                        }
                        if (lseek(fd, 0, SEEK_SET) == -1) {
                                perror("lseek 2");
                                exit(EXIT_FAILURE);
                        }
                }
        }

        if (bfs_newfs(fd, partsize) != 0)
                goto err_exit;

        close(fd);

        return 0;
 err_exit:
        close(fd);
        exit(EXIT_FAILURE);
}

static int
bfs_newfs(int fd, uint32_t nsectors)
{
        uint8_t buf[DEV_BSIZE];
        struct bfs_super_block *bfs = (void *)buf;
        struct bfs_inode *inode = (void *)buf;
        struct bfs_dirent *dirent = (void *)buf;
        time_t t = time(0);
        int error;

        /* Super block */
        memset(buf, 0, DEV_BSIZE);
        bfs->header.magic = BFS_MAGIC;
        bfs->header.data_start_byte = DEV_BSIZE * 2; /* super block + inode */
        bfs->header.data_end_byte = nsectors * BFS_BSIZE - 1;
        bfs->compaction.from = 0xffffffff;
        bfs->compaction.to = 0xffffffff;
        bfs->compaction.from_backup = 0xffffffff;
        bfs->compaction.to_backup = 0xffffffff;

        if ((error = lseek(fd, 0, SEEK_SET)) == -1) {
                perror("seek super block");
                return -1;
        }
        if (write(fd, buf, BFS_BSIZE) < 0) {
                perror("write super block");
                return -1;
        }

        /* i-node table */
        memset(buf, 0, BFS_BSIZE);
        inode->number = BFS_ROOT_INODE;
        inode->start_sector = 2;
        inode->end_sector = 2;
        inode->eof_offset_byte = sizeof(struct bfs_dirent) +
            inode->start_sector * BFS_BSIZE;
        inode->attr.atime = t;
        inode->attr.mtime = t;
        inode->attr.ctime = t;
        inode->attr.mode = 0755;
        inode->attr.type = 2;   /* DIR */
        inode->attr.nlink = 2;  /* . + .. */
        if (write(fd, buf, BFS_BSIZE) < 0) {
                perror("write i-node");
                return -1;
        }

        /* dirent table */
        memset(buf, 0, BFS_BSIZE);
        dirent->inode = BFS_ROOT_INODE;
        strcpy(dirent->name, ".");
        dirent++;
        dirent->inode = BFS_ROOT_INODE;
        strcpy(dirent->name, "..");
        if (write(fd, buf, BFS_BSIZE) < 0) {
                perror("write dirent");
                return -1;
        }

        return 0;
}

static void
usage(void)
{

        (void)fprintf(stderr, "usage: %s [-FZ] [-s sectors] special-device\n",
            getprogname());
        exit(EXIT_FAILURE);
}