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33e3963e FB |
1 | /* |
2 | * create a COW disk image | |
3 | * | |
4 | * Copyright (c) 2003 Fabrice Bellard | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
24 | #include <stdlib.h> | |
25 | #include <stdio.h> | |
26 | #include <stdarg.h> | |
27 | #include <string.h> | |
28 | #include <getopt.h> | |
29 | #include <inttypes.h> | |
30 | #include <unistd.h> | |
31 | #include <sys/mman.h> | |
32 | #include <fcntl.h> | |
33 | #include <signal.h> | |
34 | #include <time.h> | |
35 | #include <sys/time.h> | |
36 | #include <malloc.h> | |
37 | #include <termios.h> | |
38 | #include <sys/poll.h> | |
39 | #include <errno.h> | |
40 | #include <sys/wait.h> | |
abcd5da7 | 41 | #include <sys/stat.h> |
33e3963e FB |
42 | #include <netinet/in.h> |
43 | ||
44 | #include "vl.h" | |
45 | ||
abcd5da7 | 46 | #include "bswap.h" |
33e3963e FB |
47 | |
48 | int cow_create(int cow_fd, const char *image_filename, | |
49 | int64_t image_sectors) | |
50 | { | |
51 | struct cow_header_v2 cow_header; | |
52 | int fd; | |
53 | struct stat st; | |
54 | ||
55 | memset(&cow_header, 0, sizeof(cow_header)); | |
56 | cow_header.magic = htonl(COW_MAGIC); | |
57 | cow_header.version = htonl(COW_VERSION); | |
58 | if (image_filename) { | |
59 | fd = open(image_filename, O_RDONLY); | |
60 | if (fd < 0) { | |
61 | perror(image_filename); | |
62 | exit(1); | |
63 | } | |
64 | image_sectors = lseek64(fd, 0, SEEK_END); | |
65 | if (fstat(fd, &st) != 0) { | |
66 | close(fd); | |
67 | return -1; | |
68 | } | |
69 | close(fd); | |
70 | image_sectors /= 512; | |
71 | cow_header.mtime = htonl(st.st_mtime); | |
72 | realpath(image_filename, cow_header.backing_file); | |
73 | } | |
74 | cow_header.sectorsize = htonl(512); | |
75 | cow_header.size = image_sectors * 512; | |
76 | #ifndef WORDS_BIGENDIAN | |
77 | cow_header.size = bswap64(cow_header.size); | |
78 | #endif | |
79 | write(cow_fd, &cow_header, sizeof(cow_header)); | |
80 | /* resize to include at least all the bitmap */ | |
81 | ftruncate(cow_fd, sizeof(cow_header) + ((image_sectors + 7) >> 3)); | |
82 | lseek(cow_fd, 0, SEEK_SET); | |
83 | return 0; | |
84 | } | |
85 | ||
86 | void help(void) | |
87 | { | |
4690764b FB |
88 | printf("vlmkcow version " QEMU_VERSION ", Copyright (c) 2003 Fabrice Bellard\n" |
89 | "usage: vlmkcow [-h] [-f disk_image] cow_image [cow_size]\n" | |
33e3963e FB |
90 | "Create a Copy On Write disk image from an optional raw disk image\n" |
91 | "\n" | |
92 | "-f disk_image set the raw disk image name\n" | |
93 | "cow_image the created cow_image\n" | |
94 | "cow_size the create cow_image size in MB if no raw disk image is used\n" | |
95 | "\n" | |
96 | "Once the cow_image is created from a raw disk image, you must not modify the original raw disk image\n" | |
97 | ); | |
98 | exit(1); | |
99 | } | |
100 | ||
101 | int main(int argc, char **argv) | |
102 | { | |
103 | const char *image_filename, *cow_filename; | |
104 | int cow_fd, c, nb_args; | |
105 | int64_t image_size; | |
106 | ||
107 | image_filename = NULL; | |
108 | image_size = 0; | |
109 | for(;;) { | |
110 | c = getopt(argc, argv, "hf:"); | |
111 | if (c == -1) | |
112 | break; | |
113 | switch(c) { | |
114 | case 'h': | |
115 | help(); | |
116 | break; | |
117 | case 'f': | |
118 | image_filename = optarg; | |
119 | break; | |
120 | } | |
121 | } | |
122 | if (!image_filename) | |
123 | nb_args = 2; | |
124 | else | |
125 | nb_args = 1; | |
126 | if (optind + nb_args != argc) | |
127 | help(); | |
128 | ||
129 | cow_filename = argv[optind]; | |
130 | if (nb_args == 2) { | |
131 | image_size = (int64_t)atoi(argv[optind + 1]) * 2 * 1024; | |
132 | } | |
133 | ||
134 | cow_fd = open(cow_filename, O_RDWR | O_CREAT | O_TRUNC, 0644); | |
135 | if (!cow_fd < 0) | |
136 | return -1; | |
137 | if (cow_create(cow_fd, image_filename, image_size) < 0) { | |
138 | fprintf(stderr, "%s: error while formating\n", cow_filename); | |
139 | exit(1); | |
140 | } | |
141 | close(cow_fd); | |
142 | return 0; | |
143 | } |