1 /*- 2 * Copyright (c) 2011 Google, Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 /* 30 * Device descriptor for partitioned disks. To use, set the 31 * d_slice and d_partition variables as follows: 32 * 33 * Whole disk access: 34 * 35 * d_slice = -1 36 * d_partition = -1 37 * 38 * Whole MBR slice: 39 * 40 * d_slice = MBR slice number (typically 1..4) 41 * d_partition = -1 42 * 43 * BSD disklabel partition within an MBR slice: 44 * 45 * d_slice = MBR slice number (typically 1..4) 46 * d_partition = disklabel partition (typically 0..19) 47 * 48 * BSD disklabel partition on the true dedicated disk: 49 * 50 * d_slice = -1 51 * d_partition = disklabel partition (typically 0..19) 52 * 53 * GPT partition: 54 * 55 * d_slice = GPT partition number (typically 1..N) 56 * d_partition = 255 57 * 58 * For both MBR and GPT, to automatically find the 'best' slice or partition, 59 * set d_slice to zero. This uses the partition type to decide which partition 60 * to use according to the following list of preferences: 61 * 62 * FreeBSD (active) 63 * FreeBSD (inactive) 64 * Linux (active) 65 * Linux (inactive) 66 * DOS/Windows (active) 67 * DOS/Windows (inactive) 68 * 69 * Active MBR slices (marked as bootable) are preferred over inactive. GPT 70 * doesn't have the concept of active/inactive partitions. In both MBR and GPT, 71 * if there are multiple slices/partitions of a given type, the first one 72 * is chosen. 73 * 74 * The low-level disk device will typically call disk_open() from its open 75 * method to interpret the disk partition tables according to the rules above. 76 * This will initialize d_offset to the block offset of the start of the 77 * selected partition - this offset should be added to the offset passed to 78 * the device's strategy method. 79 */ 80 81 #ifndef _DISK_H 82 #define _DISK_H 83 84 /* Note: Must match the 'struct devdesc' in stand.h */ 85 struct disk_devdesc { 86 struct devdesc dd; 87 int d_slice; 88 int d_partition; 89 uint64_t d_offset; 90 }; 91 92 enum disk_ioctl { 93 IOCTL_GET_BLOCKS, 94 IOCTL_GET_BLOCK_SIZE 95 }; 96 97 /* 98 * Parse disk metadata and initialise dev->d_offset. 99 */ 100 extern int disk_open(struct disk_devdesc *, uint64_t, u_int); 101 extern int disk_close(struct disk_devdesc *); 102 extern int disk_ioctl(struct disk_devdesc *, u_long, void *); 103 extern int disk_read(struct disk_devdesc *, void *, uint64_t, u_int); 104 extern int disk_write(struct disk_devdesc *, void *, uint64_t, u_int); 105 extern int ptblread(void *, void *, size_t, uint64_t); 106 107 /* 108 * Print information about slices on a disk. 109 */ 110 extern int disk_print(struct disk_devdesc *, char *, int); 111 extern char* disk_fmtdev(struct disk_devdesc *); 112 extern int disk_parsedev(struct disk_devdesc *, const char *, const char **); 113 114 #endif /* _DISK_H */ 115