1 /* 2 * Copyright (c) 2002 Juli Mallett. All rights reserved. 3 * 4 * This software was written by Juli Mallett <jmallett@FreeBSD.org> for the 5 * FreeBSD project. Redistribution and use in source and binary forms, with 6 * or without modification, are permitted provided that the following 7 * conditions are met: 8 * 9 * 1. Redistribution of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 2. Redistribution in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 18 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 19 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 20 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 23 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 24 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25 * POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/mount.h> 33 #include <sys/disk.h> 34 #include <sys/disklabel.h> 35 #include <sys/stat.h> 36 37 #include <ufs/ufs/ufsmount.h> 38 #include <ufs/ufs/dinode.h> 39 #include <ufs/ffs/fs.h> 40 41 #include <errno.h> 42 #include <fcntl.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <unistd.h> 47 48 #include <libufs.h> 49 50 ssize_t 51 bread(struct uufsd *disk, ufs2_daddr_t blockno, void *data, size_t size) 52 { 53 void *p2; 54 ssize_t cnt; 55 56 ERROR(disk, NULL); 57 58 p2 = data; 59 /* 60 * XXX: various disk controllers require alignment of our buffer 61 * XXX: which is stricter than struct alignment. 62 * XXX: Bounce the buffer if not 64 byte aligned. 63 * XXX: this can be removed if/when the kernel is fixed 64 */ 65 if (((intptr_t)data) & 0x3f) { 66 p2 = malloc(size); 67 if (p2 == NULL) { 68 ERROR(disk, "allocate bounce buffer"); 69 goto fail; 70 } 71 } 72 cnt = pread(disk->d_fd, p2, size, (off_t)(blockno * disk->d_bsize)); 73 if (cnt == -1) { 74 ERROR(disk, "read error from block device"); 75 goto fail; 76 } 77 if (cnt == 0) { 78 ERROR(disk, "end of file from block device"); 79 goto fail; 80 } 81 if ((size_t)cnt != size) { 82 ERROR(disk, "short read or read error from block device"); 83 goto fail; 84 } 85 if (p2 != data) { 86 memcpy(data, p2, size); 87 free(p2); 88 } 89 return (cnt); 90 fail: memset(data, 0, size); 91 if (p2 != data) { 92 free(p2); 93 } 94 return (-1); 95 } 96 97 ssize_t 98 bwrite(struct uufsd *disk, ufs2_daddr_t blockno, const void *data, size_t size) 99 { 100 ssize_t cnt; 101 int rv; 102 void *p2 = NULL; 103 104 ERROR(disk, NULL); 105 106 rv = ufs_disk_write(disk); 107 if (rv == -1) { 108 ERROR(disk, "failed to open disk for writing"); 109 return (-1); 110 } 111 112 /* 113 * XXX: various disk controllers require alignment of our buffer 114 * XXX: which is stricter than struct alignment. 115 * XXX: Bounce the buffer if not 64 byte aligned. 116 * XXX: this can be removed if/when the kernel is fixed 117 */ 118 if (((intptr_t)data) & 0x3f) { 119 p2 = malloc(size); 120 if (p2 == NULL) { 121 ERROR(disk, "allocate bounce buffer"); 122 return (-1); 123 } 124 memcpy(p2, data, size); 125 data = p2; 126 } 127 cnt = pwrite(disk->d_fd, data, size, (off_t)(blockno * disk->d_bsize)); 128 if (p2 != NULL) 129 free(p2); 130 if (cnt == -1) { 131 ERROR(disk, "write error to block device"); 132 return (-1); 133 } 134 if ((size_t)cnt != size) { 135 ERROR(disk, "short write to block device"); 136 return (-1); 137 } 138 139 return (cnt); 140 } 141 142 int 143 berase(struct uufsd *disk, ufs2_daddr_t blockno, ufs2_daddr_t size) 144 { 145 off_t ioarg[2]; 146 int rv; 147 148 ERROR(disk, NULL); 149 rv = ufs_disk_write(disk); 150 if (rv == -1) { 151 ERROR(disk, "failed to open disk for writing"); 152 return(rv); 153 } 154 ioarg[0] = blockno * disk->d_bsize; 155 ioarg[1] = size; 156 rv = ioctl(disk->d_fd, DIOCGDELETE, ioarg); 157 return (rv); 158 } 159