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/disklabel.h> 34 #include <sys/stat.h> 35 36 #include <ufs/ufs/ufsmount.h> 37 #include <ufs/ufs/dinode.h> 38 #include <ufs/ffs/fs.h> 39 40 #include <errno.h> 41 #include <fcntl.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <unistd.h> 46 47 #include <libufs.h> 48 49 ssize_t 50 bread(struct uufsd *disk, ufs2_daddr_t blockno, void *data, size_t size) 51 { 52 void *p2; 53 ssize_t cnt; 54 55 ERROR(disk, NULL); 56 57 p2 = data; 58 /* 59 * XXX: various disk controllers require alignment of our buffer 60 * XXX: which is stricter than struct alignment. 61 * XXX: Bounce the buffer if not 64 byte aligned. 62 * XXX: this can be removed if/when the kernel is fixed 63 */ 64 if (((intptr_t)data) & 0x3f) { 65 p2 = malloc(size); 66 if (p2 == NULL) 67 ERROR(disk, "allocate bounce buffer"); 68 } 69 cnt = pread(disk->d_fd, p2, size, (off_t)(blockno * disk->d_bsize)); 70 if (cnt == -1) { 71 ERROR(disk, "read error from block device"); 72 goto fail; 73 } 74 if (cnt == 0) { 75 ERROR(disk, "end of file from block device"); 76 goto fail; 77 } 78 if ((size_t)cnt != size) { 79 ERROR(disk, "short read or read error from block device"); 80 goto fail; 81 } 82 if (p2 != data) { 83 memcpy(data, p2, size); 84 free(p2); 85 } 86 return (cnt); 87 fail: memset(data, 0, size); 88 if (p2 != data) { 89 free(p2); 90 } 91 return (-1); 92 } 93 94 ssize_t 95 bwrite(struct uufsd *disk, ufs2_daddr_t blockno, const void *data, size_t size) 96 { 97 ssize_t cnt; 98 int rv; 99 void *p2 = NULL; 100 101 ERROR(disk, NULL); 102 103 rv = ufs_disk_write(disk); 104 if (rv == -1) { 105 ERROR(disk, "failed to open disk for writing"); 106 return (-1); 107 } 108 109 /* 110 * XXX: various disk controllers require alignment of our buffer 111 * XXX: which is stricter than struct alignment. 112 * XXX: Bounce the buffer if not 64 byte aligned. 113 * XXX: this can be removed if/when the kernel is fixed 114 */ 115 if (((intptr_t)data) & 0x3f) { 116 p2 = malloc(size); 117 if (p2 == NULL) 118 ERROR(disk, "allocate bounce buffer"); 119 memcpy(p2, data, size); 120 data = p2; 121 } 122 cnt = pwrite(disk->d_fd, data, size, (off_t)(blockno * disk->d_bsize)); 123 if (p2 != NULL) 124 free(p2); 125 if (cnt == -1) { 126 ERROR(disk, "write error to block device"); 127 return (-1); 128 } 129 if ((size_t)cnt != size) { 130 ERROR(disk, "short write to block device"); 131 return (-1); 132 } 133 134 return (cnt); 135 } 136