mbr_part.c File Reference

PC MBR partition driver. More...

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <ipc/bd.h>
#include <async.h>
#include <as.h>
#include <fibril_synch.h>
#include <devmap.h>
#include <sys/types.h>
#include <sys/typefmt.h>
#include <inttypes.h>
#include <libblock.h>
#include <errno.h>
#include <bool.h>
#include <byteorder.h>
#include <assert.h>
#include <macros.h>
#include <task.h>

Go to the source code of this file.

Data Structures
struct	br_block_t
	Structure of a boot-record block. More...
struct	part
	Partition. More...
struct	pt_entry_t
	Structure of a partition table entry. More...
Defines
#define	NAME   "mbr_part"
Typedefs
typedef part	part_t
	Partition.
Enumerations
enum	{ N_PRIMARY = 4, BR_SIGNATURE = 0xAA55 }
enum	ptype { PT_UNUSED = 0x00, PT_EXTENDED = 0x05 }
Functions
int	main (int argc, char **argv)
static int	mbr_bd_read (part_t *p, uint64_t ba, size_t cnt, void *buf)
	Read blocks from partition.
static int	mbr_bd_write (part_t *p, uint64_t ba, size_t cnt, const void *buf)
	Write blocks to partition.
static int	mbr_bsa_translate (part_t *p, uint64_t ba, size_t cnt, uint64_t *gba)
	Translate block segment address with range checking.
static void	mbr_connection (ipc_callid_t iid, ipc_call_t *icall)
static int	mbr_init (const char *dev_name)
static part_t *	mbr_part_new (void)
	Allocate a new part_t structure.
static int	mbr_part_read (void)
	Read in partition records.
static void	mbr_pte_to_part (uint32_t base, const pt_entry_t *pte, part_t *part)
	Parse partition table entry.
Variables
static size_t	block_size
static devmap_handle_t	indev_handle
	Partitioned device (inbound device).
static part_t	plist_head
	List of partitions.

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Detailed Description

PC MBR partition driver.

Handles the PC MBR partitioning scheme. Uses a block device and provides one for each partition.

Limitations:

Only works with boot records using LBA. CHS-only records are not supported.

Referemces:

The source of MBR structures for this driver have been the following Wikipedia articles:

• http://en.wikipedia.org/wiki/Master_Boot_Record
• http://en.wikipedia.org/wiki/Extended_boot_record

The fact that the extended partition has type 0x05 is pure observation. (TODO: can it have any other type number?)

Definition in file mbr_part.c.

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