| 1 | /*
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| 2 | * Copyright (c) 2009 Jiri Svoboda
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| 3 | * Copyright (c) 2011, 2012, 2013 Dominik Taborsky
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| 4 | * All rights reserved.
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| 5 | *
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| 6 | * Redistribution and use in source and binary forms, with or without
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| 7 | * modification, are permitted provided that the following conditions
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| 8 | * are met:
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| 9 | *
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| 10 | * - Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | * - Redistributions in binary form must reproduce the above copyright
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| 13 | * notice, this list of conditions and the following disclaimer in the
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| 14 | * documentation and/or other materials provided with the distribution.
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| 15 | * - The name of the author may not be used to endorse or promote products
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| 16 | * derived from this software without specific prior written permission.
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| 17 | *
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| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 28 | */
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| 29 |
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| 30 | /** @addtogroup libmbr
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| 31 | * @{
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| 32 | */
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| 33 | /** @file
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| 34 | */
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| 35 |
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| 36 | #ifndef LIBMBR_LIBMBR_H_
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| 37 | #define LIBMBR_LIBMBR_H_
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| 38 |
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| 39 | #include <sys/types.h>
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| 40 | #include "mbr.h"
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| 41 |
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| 42 | #define LIBMBR_NAME "libmbr"
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| 43 |
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| 44 | typedef enum {
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| 45 | /** Other flags unknown - saving previous state */
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| 46 | /** Bootability */
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| 47 | ST_BOOT = 7,
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| 48 | /** Logical partition, 0 = primary, 1 = logical*/
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| 49 | ST_LOGIC = 8
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| 50 | } MBR_FLAGS;
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| 51 |
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| 52 | typedef enum {
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| 53 | /** No error */
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| 54 | ERR_OK = 0,
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| 55 | /** All primary partitions already present */
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| 56 | ERR_PRIMARY_FULL,
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| 57 | /** Extended partition already present */
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| 58 | ERR_EXTENDED_PRESENT,
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| 59 | /** No extended partition present */
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| 60 | ERR_NO_EXTENDED,
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| 61 | /** Partition overlapping */
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| 62 | ERR_OVERLAP,
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| 63 | /** Partition out of bounds */
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| 64 | ERR_OUT_BOUNDS,
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| 65 | /** No space left for EBR */
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| 66 | ERR_NO_EBR,
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| 67 | /** Out of memory */
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| 68 | ERR_NOMEM,
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| 69 | /** Libblock error */
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| 70 | ERR_LIBBLOCK,
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| 71 | } mbr_err_val;
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| 72 |
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| 73 | /** MBR header */
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| 74 | typedef struct {
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| 75 | /** Raw access to data */
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| 76 | br_block_t raw_data;
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| 77 | } mbr_t;
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| 78 |
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| 79 |
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| 80 | /** Partition */
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| 81 | typedef struct mbr_part {
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| 82 | /** The link in the doubly-linked list */
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| 83 | link_t link;
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| 84 | /** Partition type */
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| 85 | uint8_t type;
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| 86 | /** Flags */
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| 87 | uint16_t status;
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| 88 | /** Address of first block */
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| 89 | uint32_t start_addr;
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| 90 | /** Number of blocks */
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| 91 | uint32_t length;
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| 92 | /** Points to Extended Boot Record of logical partition */
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| 93 | br_block_t * ebr;
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| 94 | /** EBR address */
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| 95 | uint32_t ebr_addr;
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| 96 | } mbr_part_t;
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| 97 |
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| 98 | /** Partition list structure */
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| 99 | typedef struct mbr_parts {
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| 100 | /** Number of primary partitions */
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| 101 | unsigned char n_primary;
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| 102 | /** Index to the extended partition in the array */
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| 103 | link_t * l_extended;
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| 104 | /** Number of logical partitions */
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| 105 | unsigned int n_logical;
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| 106 | /** Logical partition linked list */
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| 107 | list_t list;
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| 108 | } mbr_partitions_t;
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| 109 |
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| 110 | /** Both header and partition list */
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| 111 | typedef struct mbr_label {
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| 112 | /** MBR header */
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| 113 | mbr_t * mbr;
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| 114 | /** Partition list */
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| 115 | mbr_partitions_t * parts;
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| 116 | /** Device where the data are from (or for) */
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| 117 | service_id_t device;
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| 118 | } mbr_label_t;
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| 119 |
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| 120 | /* Alloc complete label structure */
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| 121 | extern mbr_label_t * mbr_alloc_label(void);
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| 122 |
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| 123 | /* Read/Write MBR header.
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| 124 | * WARNING: when changing both header and partitions, write first header,
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| 125 | * then partitions. The MBR headers' raw_data is NOT updated to follow
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| 126 | * partition changes. */
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| 127 | extern mbr_t * mbr_alloc_mbr(void);
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| 128 | extern int mbr_read_mbr(mbr_label_t *, service_id_t);
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| 129 | extern int mbr_write_mbr(mbr_label_t *, service_id_t);
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| 130 | extern int mbr_is_mbr(mbr_label_t *);
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| 131 |
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| 132 | /* Read/Write/Set MBR partitions.
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| 133 | * NOTE: Writing partitions writes the complete header as well. */
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| 134 | extern int mbr_read_partitions(mbr_label_t *);
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| 135 | extern int mbr_write_partitions(mbr_label_t *, service_id_t);
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| 136 | extern mbr_part_t * mbr_alloc_partition(void);
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| 137 | extern mbr_partitions_t * mbr_alloc_partitions(void);
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| 138 | extern mbr_err_val mbr_add_partition(mbr_label_t *, mbr_part_t *);
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| 139 | extern int mbr_remove_partition(mbr_label_t *, size_t);
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| 140 | extern int mbr_get_flag(mbr_part_t *, MBR_FLAGS);
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| 141 | extern void mbr_set_flag(mbr_part_t *, MBR_FLAGS, bool);
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| 142 | extern uint32_t mbr_get_next_aligned(uint32_t, unsigned int);
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| 143 | extern list_t * mbr_get_list(mbr_label_t *);
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| 144 | extern mbr_part_t * mbr_get_first_partition(mbr_label_t *);
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| 145 | extern mbr_part_t * mbr_get_next_partition(mbr_label_t *, mbr_part_t *);
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| 146 |
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| 147 | #define mbr_part_foreach(label, iterator) \
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| 148 | for (iterator = list_get_instance((label)->parts->list.head.next, mbr_part_t, link); \
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| 149 | iterator != list_get_instance(&((label)->parts->list.head), mbr_part_t, link); \
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| 150 | iterator = list_get_instance(iterator->link.next, mbr_part_t, link))
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| 151 |
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| 152 |
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| 153 | /* free() wrapper functions. */
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| 154 | extern void mbr_free_label(mbr_label_t *);
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| 155 | extern void mbr_free_mbr(mbr_t *);
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| 156 | extern void mbr_free_partition(mbr_part_t *);
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| 157 | extern void mbr_free_partitions(mbr_partitions_t *);
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| 158 |
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| 159 | #endif
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| 160 |
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