1 /*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #define _FILE_OFFSET_BITS 64
18 #define _LARGEFILE64_SOURCE 1
19
20 #include <sys/types.h>
21 #include <sys/stat.h>
22 #include <sys/types.h>
23 #include <sys/mman.h>
24 #include <fcntl.h>
25 #include <libgen.h>
26 #include <unistd.h>
27
28 #include <sparse/sparse.h>
29
30 #include "ext4_utils.h"
31 #include "make_ext4fs.h"
32 #include "allocate.h"
33
34 #if defined(__APPLE__) && defined(__MACH__)
35 #define off64_t off_t
36 #endif
37
38 #ifndef USE_MINGW /* O_BINARY is windows-specific flag */
39 #define O_BINARY 0
40 #endif
41
42 extern struct fs_info info;
43
44 static int verbose = 0;
45
usage(char * path)46 static void usage(char *path)
47 {
48 fprintf(stderr, "%s [ options ] <image or block device> <output image>\n", path);
49 fprintf(stderr, "\n");
50 fprintf(stderr, " -c include CRC block\n");
51 fprintf(stderr, " -v verbose output\n");
52 fprintf(stderr, " -z gzip output\n");
53 fprintf(stderr, " -S don't use sparse output format\n");
54 }
55
build_sparse_ext(int fd,const char * filename)56 static int build_sparse_ext(int fd, const char *filename)
57 {
58 unsigned int i;
59 unsigned int block;
60 int start_contiguous_block;
61 u8 *block_bitmap;
62 off64_t ret;
63
64 block_bitmap = malloc(info.block_size);
65 if (!block_bitmap)
66 critical_error("failed to allocate block bitmap");
67
68 if (aux_info.first_data_block > 0)
69 sparse_file_add_file(ext4_sparse_file, filename, 0,
70 info.block_size * aux_info.first_data_block, 0);
71
72 for (i = 0; i < aux_info.groups; i++) {
73 u32 first_block = aux_info.first_data_block + i * info.blocks_per_group;
74 u32 last_block = min(info.blocks_per_group, aux_info.len_blocks - first_block);
75
76 ret = lseek64(fd, (u64)info.block_size * aux_info.bg_desc[i].bg_block_bitmap,
77 SEEK_SET);
78 if (ret < 0)
79 critical_error_errno("failed to seek to block group bitmap %d", i);
80
81 ret = read(fd, block_bitmap, info.block_size);
82 if (ret < 0)
83 critical_error_errno("failed to read block group bitmap %d", i);
84 if (ret != (int)info.block_size)
85 critical_error("failed to read all of block group bitmap %d", i);
86
87 start_contiguous_block = -1;
88 for (block = 0; block < last_block; block++) {
89 if (start_contiguous_block >= 0) {
90 if (!bitmap_get_bit(block_bitmap, block)) {
91 u32 start_block = first_block + start_contiguous_block;
92 u32 len_blocks = block - start_contiguous_block;
93
94 sparse_file_add_file(ext4_sparse_file, filename,
95 (u64)info.block_size * start_block,
96 info.block_size * len_blocks, start_block);
97 start_contiguous_block = -1;
98 }
99 } else {
100 if (bitmap_get_bit(block_bitmap, block))
101 start_contiguous_block = block;
102 }
103 }
104
105 if (start_contiguous_block >= 0) {
106 u32 start_block = first_block + start_contiguous_block;
107 u32 len_blocks = last_block - start_contiguous_block;
108 sparse_file_add_file(ext4_sparse_file, filename,
109 (u64)info.block_size * start_block,
110 info.block_size * len_blocks, start_block);
111 }
112 }
113
114 return 0;
115 }
116
main(int argc,char ** argv)117 int main(int argc, char **argv)
118 {
119 int opt;
120 const char *in = NULL;
121 const char *out = NULL;
122 int gzip = 0;
123 int sparse = 1;
124 int infd, outfd;
125 int crc = 0;
126
127 while ((opt = getopt(argc, argv, "cvzS")) != -1) {
128 switch (opt) {
129 case 'c':
130 crc = 1;
131 break;
132 case 'v':
133 verbose = 1;
134 break;
135 case 'z':
136 gzip = 1;
137 break;
138 case 'S':
139 sparse = 0;
140 break;
141 }
142 }
143
144 if (optind >= argc) {
145 fprintf(stderr, "Expected image or block device after options\n");
146 usage(argv[0]);
147 exit(EXIT_FAILURE);
148 }
149
150 in = argv[optind++];
151
152 if (optind >= argc) {
153 fprintf(stderr, "Expected output image after input image\n");
154 usage(argv[0]);
155 exit(EXIT_FAILURE);
156 }
157
158 out = argv[optind++];
159
160 if (optind < argc) {
161 fprintf(stderr, "Unexpected argument: %s\n", argv[optind]);
162 usage(argv[0]);
163 exit(EXIT_FAILURE);
164 }
165
166 infd = open(in, O_RDONLY);
167
168 if (infd < 0)
169 critical_error_errno("failed to open input image");
170
171 read_ext(infd, verbose);
172
173 ext4_sparse_file = sparse_file_new(info.block_size, info.len);
174
175 build_sparse_ext(infd, in);
176
177 close(infd);
178
179 if (strcmp(out, "-")) {
180 outfd = open(out, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
181 if (outfd < 0) {
182 error_errno("open");
183 return EXIT_FAILURE;
184 }
185 } else {
186 outfd = STDOUT_FILENO;
187 }
188
189 write_ext4_image(outfd, gzip, sparse, crc);
190 close(outfd);
191
192 sparse_file_destroy(ext4_sparse_file);
193
194 return 0;
195 }
196