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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "ext4_utils.h"
#include "make_ext4fs.h"
#include "output_file.h"
#include "backed_block.h"
#include "allocate.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <libgen.h>
#include <unistd.h>
extern struct fs_info info;
static int verbose = 0;
static void usage(char *path)
{
fprintf(stderr, "%s [ options ] <image or block device> <output image>\n", path);
fprintf(stderr, "\n");
fprintf(stderr, " -c include CRC block\n");
fprintf(stderr, " -v verbose output\n");
fprintf(stderr, " -z gzip output\n");
fprintf(stderr, " -S don't use sparse output format\n");
}
static int read_ext(int fd)
{
off64_t ret;
struct ext4_super_block sb;
unsigned int i;
ret = lseek64(fd, 1024, SEEK_SET);
if (ret < 0)
critical_error_errno("failed to seek to superblock");
ret = read(fd, &sb, sizeof(sb));
if (ret < 0)
critical_error_errno("failed to read superblock");
if (ret != sizeof(sb))
critical_error("failed to read all of superblock");
ext4_parse_sb(&sb);
ret = lseek64(fd, info.len, SEEK_SET);
if (ret < 0)
critical_error_errno("failed to seek to end of input image");
ret = lseek64(fd, info.block_size * (aux_info.first_data_block + 1), SEEK_SET);
if (ret < 0)
critical_error_errno("failed to seek to block group descriptors");
ret = read(fd, aux_info.bg_desc, info.block_size * aux_info.bg_desc_blocks);
if (ret < 0)
critical_error_errno("failed to read block group descriptors");
if (ret != (int)info.block_size * (int)aux_info.bg_desc_blocks)
critical_error("failed to read all of block group descriptors");
if (verbose) {
printf("Found filesystem with parameters:\n");
printf(" Size: %llu\n", info.len);
printf(" Block size: %d\n", info.block_size);
printf(" Blocks per group: %d\n", info.blocks_per_group);
printf(" Inodes per group: %d\n", info.inodes_per_group);
printf(" Inode size: %d\n", info.inode_size);
printf(" Label: %s\n", info.label);
printf(" Blocks: %llu\n", aux_info.len_blocks);
printf(" Block groups: %d\n", aux_info.groups);
printf(" Reserved block group size: %d\n", info.bg_desc_reserve_blocks);
printf(" Used %d/%d inodes and %d/%d blocks\n",
aux_info.sb->s_inodes_count - aux_info.sb->s_free_inodes_count,
aux_info.sb->s_inodes_count,
aux_info.sb->s_blocks_count_lo - aux_info.sb->s_free_blocks_count_lo,
aux_info.sb->s_blocks_count_lo);
}
return 0;
}
static int bitmap_get_bit(u8 *bitmap, u32 bit)
{
if (bitmap[bit / 8] & 1 << (bit % 8))
return 1;
return 0;
}
static int build_sparse_ext(int fd, const char *filename)
{
unsigned int i;
unsigned int block;
int start_contiguous_block;
u8 *block_bitmap;
off64_t ret;
block_bitmap = malloc(info.block_size);
if (!block_bitmap)
critical_error("failed to allocate block bitmap");
if (aux_info.first_data_block > 0)
queue_data_file(filename, 0,
info.block_size * aux_info.first_data_block, 0);
for (i = 0; i < aux_info.groups; i++) {
u32 first_block = aux_info.first_data_block + i * info.blocks_per_group;
u32 last_block = min(info.blocks_per_group, aux_info.len_blocks - first_block);
ret = lseek64(fd, (u64)info.block_size * aux_info.bg_desc[i].bg_block_bitmap,
SEEK_SET);
if (ret < 0)
critical_error_errno("failed to seek to block group bitmap %d", i);
ret = read(fd, block_bitmap, info.block_size);
if (ret < 0)
critical_error_errno("failed to read block group bitmap %d", i);
if (ret != (int)info.block_size)
critical_error("failed to read all of block group bitmap %d", i);
start_contiguous_block = -1;
for (block = 0; block < last_block; block++) {
if (start_contiguous_block >= 0) {
if (!bitmap_get_bit(block_bitmap, block)) {
u32 start_block = first_block + start_contiguous_block;
u32 len_blocks = block - start_contiguous_block;
queue_data_file(filename, (u64)info.block_size * start_block,
info.block_size * len_blocks, start_block);
start_contiguous_block = -1;
}
} else {
if (bitmap_get_bit(block_bitmap, block))
start_contiguous_block = block;
}
}
if (start_contiguous_block >= 0) {
u32 start_block = first_block + start_contiguous_block;
u32 len_blocks = last_block - start_contiguous_block;
queue_data_file(filename, (u64)info.block_size * start_block,
info.block_size * len_blocks, start_block);
}
}
return 0;
}
int main(int argc, char **argv)
{
int opt;
const char *in = NULL;
const char *out = NULL;
int gzip = 0;
int sparse = 1;
int fd;
int crc = 0;
while ((opt = getopt(argc, argv, "cvzS")) != -1) {
switch (opt) {
case 'c':
crc = 1;
break;
case 'v':
verbose = 1;
break;
case 'z':
gzip = 1;
break;
case 'S':
sparse = 0;
break;
}
}
if (optind >= argc) {
fprintf(stderr, "Expected image or block device after options\n");
usage(argv[0]);
exit(EXIT_FAILURE);
}
in = argv[optind++];
if (optind >= argc) {
fprintf(stderr, "Expected output image after input image\n");
usage(argv[0]);
exit(EXIT_FAILURE);
}
out = argv[optind++];
if (optind < argc) {
fprintf(stderr, "Unexpected argument: %s\n", argv[optind]);
usage(argv[0]);
exit(EXIT_FAILURE);
}
fd = open(in, O_RDONLY);
if (fd < 0)
critical_error_errno("failed to open input image");
read_ext(fd);
build_sparse_ext(fd, in);
close(fd);
write_ext4_image(out, gzip, sparse, crc, 0);
return 0;
}