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Remove mbrfs.

This commit is contained in:
Jonas 'Sortie' Termansen 2015-07-24 02:26:54 +02:00
parent 9fe234d4d8
commit caf632ccdd
4 changed files with 0 additions and 302 deletions
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1
Makefile
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@ -19,7 +19,6 @@ init \
kblayout \
kblayout-compiler \
login \
mbr \
mkinitrd \
regress \
sf \

1
mbr/.gitignore vendored
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@ -1 +0,0 @@
mbrfs

26
mbr/Makefile
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@ -1,26 +0,0 @@
SOFTWARE_MEANT_FOR_SORTIX=1
include ../build-aux/platform.mak
include ../build-aux/compiler.mak
include ../build-aux/version.mak
include ../build-aux/dirs.mak
OPTLEVEL?=$(DEFAULT_OPTLEVEL)
CXXFLAGS?=$(OPTLEVEL)
CXXFLAGS:=$(CXXFLAGS) -Wall -Wextra -fno-exceptions -fno-rtti
BINARY:=mbrfs
all: $(BINARY)
.PHONY: all install clean
install: all
mkdir -p $(DESTDIR)$(BINDIR)
install $(BINARY) $(DESTDIR)$(BINDIR)
%: %.cpp
$(CXX) -std=gnu++11 $(CPPFLAGS) $(CXXFLAGS) $< -o $@
clean:
rm -f $(BINARY) *.o

274
mbr/mbrfs.cpp
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@ -1,274 +0,0 @@
/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2013.
This program is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option)
any later version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see <http://www.gnu.org/licenses/>.
mbrfs.cpp
Creates block devices representing master boot record partitions.
*******************************************************************************/
#include <endian.h>
#include <errno.h>
#include <error.h>
#include <fcntl.h>
#include <ioleast.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fsmarshall.h>
struct partition
{
little_uint8_t flags;
little_uint8_t start_head;
little_uint16_t start_sector_cylinder;
little_uint8_t system_id;
little_uint8_t end_head;
little_uint16_t end_sector_cylinder;
little_uint32_t start_sector;
little_uint32_t total_sectors;
} __attribute__((packed));
struct partition_lba48
{
little_uint8_t flags;
little_uint8_t signature1;
little_uint16_t start_sector_high;
little_uint8_t system_id;
little_uint8_t signature2;
little_uint16_t total_sectors_high;
little_uint32_t start_sector;
little_uint32_t total_sectors;
} __attribute__((packed));
struct mbr
{
uint8_t bootstrap[436];
uint8_t unique_disk_id[10];
struct partition partitions[4];
uint8_t signature[2];
} __attribute__((packed));
bool memiszero(const void* mem, size_t size)
{
for ( size_t i = 0; i < size; i++ )
if ( ((const uint8_t*) mem)[i] )
return false;
return true;
}
bool is_48bit_lba_partition(const struct partition* partition)
{
const struct partition_lba48* partition_lba48 =
(const struct partition_lba48*) partition;
return partition_lba48->flags & 0x1 &&
partition_lba48->signature1 == 0x14 &&
partition_lba48->signature2 == 0xeb;
}
bool is_extended_partition(const struct partition* partition)
{
return partition->system_id == 0x5 || partition->system_id == 0xF;
}
uint64_t partition_get_start(const struct partition* partition)
{
if ( !is_48bit_lba_partition(partition) )
return (uint64_t) partition->start_sector * 512;
const struct partition_lba48* partition_lba48 =
(const struct partition_lba48*) partition;
uint64_t lower = partition_lba48->start_sector;
uint64_t higher = partition_lba48->start_sector_high;
return ((higher << 32) + lower) * 512;
}
uint64_t partition_get_length(const struct partition* partition)
{
if ( !is_48bit_lba_partition(partition) )
return (uint64_t) partition->total_sectors * 512;
const struct partition_lba48* partition_lba48 =
(const struct partition_lba48*) partition;
uint64_t lower = partition_lba48->total_sectors;
uint64_t higher = partition_lba48->total_sectors_high;
return ((higher << 32) + lower) * 512;
}
bool is_partition_used(const struct partition* partition)
{
if ( memiszero(partition, sizeof(*partition)) )
return false;
if ( !partition->system_id )
return false;
if ( !partition_get_start(partition) )
return false;
if ( !partition_get_length(partition) )
return false;
return true;
}
bool verify_is_partition(const struct partition* partition)
{
if ( memiszero(partition, sizeof(*partition)) )
return true;
return true;
}
bool verify_is_mbr(const struct mbr* mbr)
{
if ( memiszero(mbr, sizeof(*mbr)) )
return false;
if ( !(mbr->signature[0] == 0x55 && mbr->signature[1] == 0xAA) )
return false;
bool found_extended = false;
for ( size_t i = 0; i < 4; i++ )
{
const struct partition* partition = &mbr->partitions[i];
if ( !verify_is_partition(partition) )
return false;
if ( is_extended_partition(partition) )
{
if ( found_extended )
return false;
found_extended = true;
}
}
return true;
}
int create_partition_block_device(const char* path, int diskfd, off_t start,
off_t length)
{
int ret = -1, mountfd, partfd;
// Make sure that is a file that we can mount bind us on.
if ( 0 <= (mountfd = open(path, O_RDONLY | O_CREAT, 0666)) )
{
// Create a file descriptor for our new partition.
if ( 0 <= (partfd = mkpartition(diskfd, start, length)) )
{
ret = fsm_fsbind(partfd, mountfd, 0);
close(partfd);
}
close(mountfd);
}
return ret;
}
void Usage(FILE* fp, const char* argv0)
{
fprintf(fp, "Usage: %s [--probe] DEVICE...\n", argv0);
}
void Help(FILE* fp, const char* argv0)
{
Usage(fp, argv0);
}
void Version(FILE* fp, const char* argv0)
{
Usage(fp, argv0);
}
int main(int argc, char* argv[])
{
const char* argv0 = argv[0];
bool probe = false;
for ( int i = 1; i < argc; i++ )
{
const char* arg = argv[i];
if ( arg[0] != '-' )
continue;
argv[i] = NULL;
if ( !strcmp(arg, "--") )
break;
if ( arg[1] != '-' )
{
while ( char c = *++arg ) switch ( c )
{
default:
fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
Usage(stderr, argv0);
exit(1);
}
}
else if ( !strcmp(arg, "--help") ) { Help(stdout, argv0); exit(0); }
else if ( !strcmp(arg, "--usage") ) { Usage(stdout, argv0); exit(0); }
else if ( !strcmp(arg, "--version") ) { Version(stdout, argv0); exit(0); }
else if ( !strcmp(arg, "--probe") )
probe = true;
else
{
fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
Usage(stderr, argv0);
exit(1);
}
}
if ( argc == 1 )
{
Usage(stderr, argv0);
exit(0);
}
for ( int i = 1; i < argc; i++ )
{
if ( !argv[i] )
continue;
const char* path = argv[i];
size_t path_len = strlen(path);
int fd = open(path, O_RDWR);
if ( fd < 0 )
error(1, errno, "`%s'", path);
struct mbr mbr;
size_t amount = preadall(fd, &mbr, sizeof(mbr), 0);
if ( amount < sizeof(mbr) && errno != EEOF )
error(1, errno, "read: `%s'", path);
if ( amount < sizeof(mbr) || !verify_is_mbr(&mbr) )
{
if ( probe )
exit(1);
error(1, 0, "`%s': No valid master boot record detected", path);
}
for ( size_t i = 0; !probe && i < 4; i++ )
{
struct partition* partition = &mbr.partitions[i];
if ( !is_partition_used(partition) )
continue;
// TODO: Support extended partitions!
if ( is_extended_partition(partition) )
continue;
uint64_t start = partition_get_start(partition);
uint64_t length = partition_get_length(partition);
size_t device_name_len = path_len + 1 + sizeof(size_t) * 3;
char* device_name = new char[device_name_len+1];
snprintf(device_name, device_name_len, "%sp%zu", path, i+1);
if ( create_partition_block_device(device_name, fd, start, length) != 0 )
error(1, errno, "creating `%s'", device_name);
printf("%s\n", device_name);
delete[] device_name;
}
close(fd);
}
return 0;
}