Browse Source
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@309 c046a42c-6fe2-441c-8c8c-71466251a162stable-0.10
bellard
23 years ago
5 changed files with 442 additions and 44 deletions
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/*
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* create a COW disk image |
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* |
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* Copyright (c) 2003 Fabrice Bellard |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in |
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* all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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* THE SOFTWARE. |
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*/ |
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <stdarg.h> |
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#include <string.h> |
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#include <getopt.h> |
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#include <inttypes.h> |
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#include <unistd.h> |
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#include <sys/mman.h> |
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#include <fcntl.h> |
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#include <signal.h> |
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#include <time.h> |
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#include <sys/time.h> |
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#include <malloc.h> |
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#include <termios.h> |
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#include <sys/poll.h> |
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#include <errno.h> |
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#include <sys/wait.h> |
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#include <netinet/in.h> |
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#include "vl.h" |
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#define NO_THUNK_TYPE_SIZE |
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#include "thunk.h" |
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int cow_create(int cow_fd, const char *image_filename, |
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int64_t image_sectors) |
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{ |
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struct cow_header_v2 cow_header; |
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int fd; |
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struct stat st; |
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memset(&cow_header, 0, sizeof(cow_header)); |
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cow_header.magic = htonl(COW_MAGIC); |
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cow_header.version = htonl(COW_VERSION); |
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if (image_filename) { |
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fd = open(image_filename, O_RDONLY); |
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if (fd < 0) { |
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perror(image_filename); |
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exit(1); |
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} |
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image_sectors = lseek64(fd, 0, SEEK_END); |
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if (fstat(fd, &st) != 0) { |
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close(fd); |
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return -1; |
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} |
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close(fd); |
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image_sectors /= 512; |
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cow_header.mtime = htonl(st.st_mtime); |
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realpath(image_filename, cow_header.backing_file); |
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} |
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cow_header.sectorsize = htonl(512); |
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cow_header.size = image_sectors * 512; |
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#ifndef WORDS_BIGENDIAN |
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cow_header.size = bswap64(cow_header.size); |
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#endif |
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write(cow_fd, &cow_header, sizeof(cow_header)); |
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/* resize to include at least all the bitmap */ |
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ftruncate(cow_fd, sizeof(cow_header) + ((image_sectors + 7) >> 3)); |
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lseek(cow_fd, 0, SEEK_SET); |
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return 0; |
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} |
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void help(void) |
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{ |
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printf("usage vlmkcow [-h] [-f disk_image] cow_image [cow_size]\n" |
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"Create a Copy On Write disk image from an optional raw disk image\n" |
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"\n" |
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"-f disk_image set the raw disk image name\n" |
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"cow_image the created cow_image\n" |
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"cow_size the create cow_image size in MB if no raw disk image is used\n" |
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"\n" |
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"Once the cow_image is created from a raw disk image, you must not modify the original raw disk image\n" |
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); |
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exit(1); |
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} |
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int main(int argc, char **argv) |
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{ |
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const char *image_filename, *cow_filename; |
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int cow_fd, c, nb_args; |
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int64_t image_size; |
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image_filename = NULL; |
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image_size = 0; |
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for(;;) { |
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c = getopt(argc, argv, "hf:"); |
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if (c == -1) |
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break; |
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switch(c) { |
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case 'h': |
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help(); |
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break; |
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case 'f': |
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image_filename = optarg; |
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break; |
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} |
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} |
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if (!image_filename) |
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nb_args = 2; |
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else |
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nb_args = 1; |
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if (optind + nb_args != argc) |
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help(); |
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cow_filename = argv[optind]; |
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if (nb_args == 2) { |
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image_size = (int64_t)atoi(argv[optind + 1]) * 2 * 1024; |
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} |
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cow_fd = open(cow_filename, O_RDWR | O_CREAT | O_TRUNC, 0644); |
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if (!cow_fd < 0) |
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return -1; |
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if (cow_create(cow_fd, image_filename, image_size) < 0) { |
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fprintf(stderr, "%s: error while formating\n", cow_filename); |
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exit(1); |
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} |
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close(cow_fd); |
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return 0; |
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} |
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