1 /* $NetBSD: mdconfig.c,v 1.7 2020/08/18 19:26:29 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Gordon W. Ross 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 #ifndef lint 30 __RCSID("$NetBSD: mdconfig.c,v 1.7 2020/08/18 19:26:29 christos Exp $"); 31 #endif 32 33 /* 34 * This program exists for the sole purpose of providing 35 * user-space memory for the new memory-disk driver (md). 36 * The job done by this is similar to mount_mfs. 37 * (But this design allows any filesystem format!) 38 */ 39 40 #include <sys/errno.h> 41 #include <sys/ioctl.h> 42 #include <sys/mman.h> 43 #include <sys/param.h> 44 #include <sys/types.h> 45 46 #include <dev/md.h> 47 48 #include <assert.h> 49 #include <err.h> 50 #include <errno.h> 51 #include <fcntl.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <util.h> 55 56 int 57 main(int argc, char *argv[]) 58 { 59 struct md_conf md; 60 char fname[MAXPATHLEN]; 61 int64_t num; 62 size_t blks, bytes; 63 int fd; 64 65 setprogname(argv[0]); 66 67 if (argc != 3) { 68 (void)fprintf(stderr, "Usage: %s <device> <%d-byte-blocks>\n", 69 getprogname(), DEV_BSIZE); 70 return EXIT_FAILURE; 71 } 72 73 if (dehumanize_number(argv[2], &num) == -1) 74 goto bad_num; 75 76 blks = (size_t)num; 77 bytes = blks << DEV_BSHIFT; 78 if (num <= 0 || bytes >> DEV_BSHIFT != blks) { 79 bad_num: err(EXIT_FAILURE, "blocks: `%s'", argv[2]); 80 } 81 md.md_size = bytes; 82 83 fd = opendisk(argv[1], O_RDWR, fname, sizeof(fname), 0); 84 if (fd == -1) 85 err(EXIT_FAILURE, "Can't open `%s'", argv[1]); 86 87 md.md_addr = mmap(NULL, md.md_size, PROT_READ | PROT_WRITE, 88 MAP_ANON | MAP_PRIVATE, -1, 0); 89 if (md.md_addr == MAP_FAILED) 90 err(EXIT_FAILURE, "mmap"); 91 92 /* Become server! */ 93 md.md_type = MD_UMEM_SERVER; 94 if (ioctl(fd, MD_SETCONF, &md) == -1) 95 err(EXIT_FAILURE, "ioctl"); 96 97 return EXIT_SUCCESS; 98 } 99