325 lines
11 KiB
C
325 lines
11 KiB
C
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#include "devices/partition.h"
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#include <packed.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include "devices/block.h"
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#include "threads/malloc.h"
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/* A partition of a block device. */
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struct partition
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{
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struct block *block; /* Underlying block device. */
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block_sector_t start; /* First sector within device. */
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};
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static struct block_operations partition_operations;
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static void read_partition_table (struct block *, block_sector_t sector,
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block_sector_t primary_extended_sector,
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int *part_nr);
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static void found_partition (struct block *, uint8_t type,
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block_sector_t start, block_sector_t size,
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int part_nr);
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static const char *partition_type_name (uint8_t);
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/* Scans BLOCK for partitions of interest to Pintos. */
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void
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partition_scan (struct block *block)
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{
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int part_nr = 0;
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read_partition_table (block, 0, 0, &part_nr);
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if (part_nr == 0)
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printf ("%s: Device contains no partitions\n", block_name (block));
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}
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/* Reads the partition table in the given SECTOR of BLOCK and
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scans it for partitions of interest to Pintos.
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If SECTOR is 0, so that this is the top-level partition table
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on BLOCK, then PRIMARY_EXTENDED_SECTOR is not meaningful;
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otherwise, it should designate the sector of the top-level
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extended partition table that was traversed to arrive at
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SECTOR, for use in finding logical partitions (see the large
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comment below).
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PART_NR points to the number of non-empty primary or logical
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partitions already encountered on BLOCK. It is incremented as
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partitions are found. */
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static void
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read_partition_table (struct block *block, block_sector_t sector,
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block_sector_t primary_extended_sector,
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int *part_nr)
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{
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/* Format of a partition table entry. See [Partitions]. */
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struct partition_table_entry
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{
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uint8_t bootable; /* 0x00=not bootable, 0x80=bootable. */
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uint8_t start_chs[3]; /* Encoded starting cylinder, head, sector. */
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uint8_t type; /* Partition type (see partition_type_name). */
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uint8_t end_chs[3]; /* Encoded ending cylinder, head, sector. */
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uint32_t offset; /* Start sector offset from partition table. */
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uint32_t size; /* Number of sectors. */
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}
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PACKED;
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/* Partition table sector. */
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struct partition_table
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{
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uint8_t loader[446]; /* Loader, in top-level partition table. */
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struct partition_table_entry partitions[4]; /* Table entries. */
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uint16_t signature; /* Should be 0xaa55. */
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}
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PACKED;
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struct partition_table *pt;
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size_t i;
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/* Check SECTOR validity. */
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if (sector >= block_size (block))
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{
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printf ("%s: Partition table at sector %"PRDSNu" past end of device.\n",
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block_name (block), sector);
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return;
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}
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/* Read sector. */
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ASSERT (sizeof *pt == BLOCK_SECTOR_SIZE);
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pt = malloc (sizeof *pt);
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if (pt == NULL)
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PANIC ("Failed to allocate memory for partition table.");
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block_read (block, 0, pt);
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/* Check signature. */
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if (pt->signature != 0xaa55)
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{
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if (primary_extended_sector == 0)
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printf ("%s: Invalid partition table signature\n", block_name (block));
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else
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printf ("%s: Invalid extended partition table in sector %"PRDSNu"\n",
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block_name (block), sector);
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free (pt);
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return;
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}
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/* Parse partitions. */
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for (i = 0; i < sizeof pt->partitions / sizeof *pt->partitions; i++)
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{
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struct partition_table_entry *e = &pt->partitions[i];
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if (e->size == 0 || e->type == 0)
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{
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/* Ignore empty partition. */
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}
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else if (e->type == 0x05 /* Extended partition. */
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|| e->type == 0x0f /* Windows 98 extended partition. */
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|| e->type == 0x85 /* Linux extended partition. */
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|| e->type == 0xc5) /* DR-DOS extended partition. */
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{
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printf ("%s: Extended partition in sector %"PRDSNu"\n",
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block_name (block), sector);
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/* The interpretation of the offset field for extended
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partitions is bizarre. When the extended partition
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table entry is in the master boot record, that is,
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the device's primary partition table in sector 0, then
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the offset is an absolute sector number. Otherwise,
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no matter how deep the partition table we're reading
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is nested, the offset is relative to the start of
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the extended partition that the MBR points to. */
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if (sector == 0)
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read_partition_table (block, e->offset, e->offset, part_nr);
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else
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read_partition_table (block, e->offset + primary_extended_sector,
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primary_extended_sector, part_nr);
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}
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else
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{
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++*part_nr;
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found_partition (block, e->type, e->offset + sector,
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e->size, *part_nr);
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}
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}
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free (pt);
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}
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/* We have found a primary or logical partition of the given TYPE
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on BLOCK, starting at sector START and continuing for SIZE
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sectors, which we are giving the partition number PART_NR.
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Check whether this is a partition of interest to Pintos, and
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if so then add it to the proper element of partitions[]. */
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static void
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found_partition (struct block *block, uint8_t part_type,
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block_sector_t start, block_sector_t size,
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int part_nr)
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{
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if (start >= block_size (block))
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printf ("%s%d: Partition starts past end of device (sector %"PRDSNu")\n",
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block_name (block), part_nr, start);
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else if (start + size < start || start + size > block_size (block))
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printf ("%s%d: Partition end (%"PRDSNu") past end of device (%"PRDSNu")\n",
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block_name (block), part_nr, start + size, block_size (block));
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else
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{
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enum block_type type = (part_type == 0x20 ? BLOCK_KERNEL
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: part_type == 0x21 ? BLOCK_FILESYS
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: part_type == 0x22 ? BLOCK_SCRATCH
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: part_type == 0x23 ? BLOCK_SWAP
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: BLOCK_FOREIGN);
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struct partition *p;
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char extra_info[128];
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char name[16];
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p = malloc (sizeof *p);
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if (p == NULL)
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PANIC ("Failed to allocate memory for partition descriptor");
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p->block = block;
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p->start = start;
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snprintf (name, sizeof name, "%s%d", block_name (block), part_nr);
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snprintf (extra_info, sizeof extra_info, "%s (%02x)",
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partition_type_name (part_type), part_type);
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block_register (name, type, extra_info, size, &partition_operations, p);
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}
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}
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/* Returns a human-readable name for the given partition TYPE. */
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static const char *
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partition_type_name (uint8_t type)
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{
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/* Name of each known type of partition.
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From util-linux-2.12r/fdisk/i386_sys_types.c.
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This initializer makes use of a C99 feature that allows
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array elements to be initialized by index. */
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static const char *type_names[256] =
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{
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[0x00] = "Empty",
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[0x01] = "FAT12",
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[0x02] = "XENIX root",
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[0x03] = "XENIX usr",
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[0x04] = "FAT16 <32M",
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[0x05] = "Extended",
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[0x06] = "FAT16",
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[0x07] = "HPFS/NTFS",
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[0x08] = "AIX",
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[0x09] = "AIX bootable",
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[0x0a] = "OS/2 Boot Manager",
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[0x0b] = "W95 FAT32",
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[0x0c] = "W95 FAT32 (LBA)",
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[0x0e] = "W95 FAT16 (LBA)",
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[0x0f] = "W95 Ext'd (LBA)",
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[0x10] = "OPUS",
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[0x11] = "Hidden FAT12",
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[0x12] = "Compaq diagnostics",
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[0x14] = "Hidden FAT16 <32M",
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[0x16] = "Hidden FAT16",
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[0x17] = "Hidden HPFS/NTFS",
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[0x18] = "AST SmartSleep",
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[0x1b] = "Hidden W95 FAT32",
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[0x1c] = "Hidden W95 FAT32 (LBA)",
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[0x1e] = "Hidden W95 FAT16 (LBA)",
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[0x20] = "Pintos OS kernel",
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[0x21] = "Pintos file system",
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[0x22] = "Pintos scratch",
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[0x23] = "Pintos swap",
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[0x24] = "NEC DOS",
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[0x39] = "Plan 9",
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[0x3c] = "PartitionMagic recovery",
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[0x40] = "Venix 80286",
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[0x41] = "PPC PReP Boot",
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[0x42] = "SFS",
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[0x4d] = "QNX4.x",
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[0x4e] = "QNX4.x 2nd part",
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[0x4f] = "QNX4.x 3rd part",
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[0x50] = "OnTrack DM",
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[0x51] = "OnTrack DM6 Aux1",
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[0x52] = "CP/M",
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[0x53] = "OnTrack DM6 Aux3",
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[0x54] = "OnTrackDM6",
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[0x55] = "EZ-Drive",
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[0x56] = "Golden Bow",
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[0x5c] = "Priam Edisk",
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[0x61] = "SpeedStor",
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[0x63] = "GNU HURD or SysV",
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[0x64] = "Novell Netware 286",
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[0x65] = "Novell Netware 386",
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[0x70] = "DiskSecure Multi-Boot",
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[0x75] = "PC/IX",
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[0x80] = "Old Minix",
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[0x81] = "Minix / old Linux",
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[0x82] = "Linux swap / Solaris",
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[0x83] = "Linux",
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[0x84] = "OS/2 hidden C: drive",
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[0x85] = "Linux extended",
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[0x86] = "NTFS volume set",
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[0x87] = "NTFS volume set",
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[0x88] = "Linux plaintext",
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[0x8e] = "Linux LVM",
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[0x93] = "Amoeba",
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[0x94] = "Amoeba BBT",
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[0x9f] = "BSD/OS",
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[0xa0] = "IBM Thinkpad hibernation",
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[0xa5] = "FreeBSD",
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[0xa6] = "OpenBSD",
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[0xa7] = "NeXTSTEP",
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[0xa8] = "Darwin UFS",
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[0xa9] = "NetBSD",
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[0xab] = "Darwin boot",
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[0xb7] = "BSDI fs",
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[0xb8] = "BSDI swap",
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[0xbb] = "Boot Wizard hidden",
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[0xbe] = "Solaris boot",
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[0xbf] = "Solaris",
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[0xc1] = "DRDOS/sec (FAT-12)",
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[0xc4] = "DRDOS/sec (FAT-16 < 32M)",
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[0xc6] = "DRDOS/sec (FAT-16)",
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[0xc7] = "Syrinx",
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[0xda] = "Non-FS data",
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[0xdb] = "CP/M / CTOS / ...",
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[0xde] = "Dell Utility",
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[0xdf] = "BootIt",
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[0xe1] = "DOS access",
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[0xe3] = "DOS R/O",
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[0xe4] = "SpeedStor",
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[0xeb] = "BeOS fs",
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[0xee] = "EFI GPT",
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[0xef] = "EFI (FAT-12/16/32)",
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[0xf0] = "Linux/PA-RISC boot",
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[0xf1] = "SpeedStor",
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[0xf4] = "SpeedStor",
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[0xf2] = "DOS secondary",
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[0xfd] = "Linux raid autodetect",
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[0xfe] = "LANstep",
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[0xff] = "BBT",
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};
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return type_names[type] != NULL ? type_names[type] : "Unknown";
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}
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/* Reads sector SECTOR from partition P into BUFFER, which must
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have room for BLOCK_SECTOR_SIZE bytes. */
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static void
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partition_read (void *p_, block_sector_t sector, void *buffer)
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{
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struct partition *p = p_;
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block_read (p->block, p->start + sector, buffer);
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}
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/* Write sector SECTOR to partition P from BUFFER, which must
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contain BLOCK_SECTOR_SIZE bytes. Returns after the block has
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acknowledged receiving the data. */
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static void
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partition_write (void *p_, block_sector_t sector, const void *buffer)
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{
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struct partition *p = p_;
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block_write (p->block, p->start + sector, buffer);
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}
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static struct block_operations partition_operations =
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{
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partition_read,
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partition_write
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};
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