]>
Commit | Line | Data |
---|---|---|
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> | |
33e3963e FB |
31 | #include <fcntl.h> |
32 | #include <signal.h> | |
33 | #include <time.h> | |
34 | #include <sys/time.h> | |
33e3963e | 35 | #include <errno.h> |
abcd5da7 | 36 | #include <sys/stat.h> |
33e3963e FB |
37 | #include <netinet/in.h> |
38 | ||
00af2b26 | 39 | #include "cow.h" |
33e3963e | 40 | |
abcd5da7 | 41 | #include "bswap.h" |
33e3963e FB |
42 | |
43 | int cow_create(int cow_fd, const char *image_filename, | |
44 | int64_t image_sectors) | |
45 | { | |
46 | struct cow_header_v2 cow_header; | |
47 | int fd; | |
48 | struct stat st; | |
49 | ||
50 | memset(&cow_header, 0, sizeof(cow_header)); | |
51 | cow_header.magic = htonl(COW_MAGIC); | |
52 | cow_header.version = htonl(COW_VERSION); | |
53 | if (image_filename) { | |
54 | fd = open(image_filename, O_RDONLY); | |
55 | if (fd < 0) { | |
56 | perror(image_filename); | |
57 | exit(1); | |
58 | } | |
59 | image_sectors = lseek64(fd, 0, SEEK_END); | |
60 | if (fstat(fd, &st) != 0) { | |
61 | close(fd); | |
62 | return -1; | |
63 | } | |
64 | close(fd); | |
65 | image_sectors /= 512; | |
66 | cow_header.mtime = htonl(st.st_mtime); | |
67 | realpath(image_filename, cow_header.backing_file); | |
68 | } | |
69 | cow_header.sectorsize = htonl(512); | |
70 | cow_header.size = image_sectors * 512; | |
71 | #ifndef WORDS_BIGENDIAN | |
72 | cow_header.size = bswap64(cow_header.size); | |
73 | #endif | |
74 | write(cow_fd, &cow_header, sizeof(cow_header)); | |
75 | /* resize to include at least all the bitmap */ | |
76 | ftruncate(cow_fd, sizeof(cow_header) + ((image_sectors + 7) >> 3)); | |
77 | lseek(cow_fd, 0, SEEK_SET); | |
78 | return 0; | |
79 | } | |
80 | ||
81 | void help(void) | |
82 | { | |
4690764b FB |
83 | printf("vlmkcow version " QEMU_VERSION ", Copyright (c) 2003 Fabrice Bellard\n" |
84 | "usage: vlmkcow [-h] [-f disk_image] cow_image [cow_size]\n" | |
33e3963e FB |
85 | "Create a Copy On Write disk image from an optional raw disk image\n" |
86 | "\n" | |
87 | "-f disk_image set the raw disk image name\n" | |
88 | "cow_image the created cow_image\n" | |
89 | "cow_size the create cow_image size in MB if no raw disk image is used\n" | |
90 | "\n" | |
91 | "Once the cow_image is created from a raw disk image, you must not modify the original raw disk image\n" | |
92 | ); | |
93 | exit(1); | |
94 | } | |
95 | ||
96 | int main(int argc, char **argv) | |
97 | { | |
98 | const char *image_filename, *cow_filename; | |
00af2b26 | 99 | int cow_fd, c, nb_args, simple_image; |
33e3963e FB |
100 | int64_t image_size; |
101 | ||
102 | image_filename = NULL; | |
103 | image_size = 0; | |
00af2b26 | 104 | simple_image = 0; |
33e3963e | 105 | for(;;) { |
00af2b26 | 106 | c = getopt(argc, argv, "hf:s"); |
33e3963e FB |
107 | if (c == -1) |
108 | break; | |
109 | switch(c) { | |
110 | case 'h': | |
111 | help(); | |
112 | break; | |
113 | case 'f': | |
114 | image_filename = optarg; | |
115 | break; | |
00af2b26 FB |
116 | case 's': |
117 | simple_image = 1; | |
118 | break; | |
33e3963e FB |
119 | } |
120 | } | |
121 | if (!image_filename) | |
122 | nb_args = 2; | |
123 | else | |
124 | nb_args = 1; | |
125 | if (optind + nb_args != argc) | |
126 | help(); | |
127 | ||
128 | cow_filename = argv[optind]; | |
129 | if (nb_args == 2) { | |
130 | image_size = (int64_t)atoi(argv[optind + 1]) * 2 * 1024; | |
131 | } | |
132 | ||
00af2b26 | 133 | cow_fd = open(cow_filename, O_RDWR | O_CREAT | O_TRUNC | O_LARGEFILE, 0644); |
33e3963e FB |
134 | if (!cow_fd < 0) |
135 | return -1; | |
00af2b26 FB |
136 | if (simple_image) { |
137 | ftruncate64(cow_fd, image_size * 512); | |
138 | } else { | |
139 | if (cow_create(cow_fd, image_filename, image_size) < 0) { | |
140 | fprintf(stderr, "%s: error while formating\n", cow_filename); | |
141 | exit(1); | |
142 | } | |
33e3963e FB |
143 | } |
144 | close(cow_fd); | |
145 | return 0; | |
146 | } |